v4.19.13 snapshot.
diff --git a/arch/um/drivers/Kconfig b/arch/um/drivers/Kconfig
new file mode 100644
index 0000000..2b1aaf7
--- /dev/null
+++ b/arch/um/drivers/Kconfig
@@ -0,0 +1,337 @@
+# SPDX-License-Identifier: GPL-2.0
+
+menu "UML Character Devices"
+
+config STDERR_CONSOLE
+ bool "stderr console"
+ default y
+ help
+ console driver which dumps all printk messages to stderr.
+
+config SSL
+ bool "Virtual serial line"
+ help
+ The User-Mode Linux environment allows you to create virtual serial
+ lines on the UML that are usually made to show up on the host as
+ ttys or ptys.
+
+ See <http://user-mode-linux.sourceforge.net/old/input.html> for more
+ information and command line examples of how to use this facility.
+
+ Unless you have a specific reason for disabling this, say Y.
+
+config NULL_CHAN
+ bool "null channel support"
+ help
+ This option enables support for attaching UML consoles and serial
+ lines to a device similar to /dev/null. Data written to it disappears
+ and there is never any data to be read.
+
+config PORT_CHAN
+ bool "port channel support"
+ help
+ This option enables support for attaching UML consoles and serial
+ lines to host portals. They may be accessed with 'telnet <host>
+ <port number>'. Any number of consoles and serial lines may be
+ attached to a single portal, although what UML device you get when
+ you telnet to that portal will be unpredictable.
+ It is safe to say 'Y' here.
+
+config PTY_CHAN
+ bool "pty channel support"
+ help
+ This option enables support for attaching UML consoles and serial
+ lines to host pseudo-terminals. Access to both traditional
+ pseudo-terminals (/dev/pty*) and pts pseudo-terminals are controlled
+ with this option. The assignment of UML devices to host devices
+ will be announced in the kernel message log.
+ It is safe to say 'Y' here.
+
+config TTY_CHAN
+ bool "tty channel support"
+ help
+ This option enables support for attaching UML consoles and serial
+ lines to host terminals. Access to both virtual consoles
+ (/dev/tty*) and the slave side of pseudo-terminals (/dev/ttyp* and
+ /dev/pts/*) are controlled by this option.
+ It is safe to say 'Y' here.
+
+config XTERM_CHAN
+ bool "xterm channel support"
+ help
+ This option enables support for attaching UML consoles and serial
+ lines to xterms. Each UML device so assigned will be brought up in
+ its own xterm.
+ It is safe to say 'Y' here.
+
+config NOCONFIG_CHAN
+ bool
+ default !(XTERM_CHAN && TTY_CHAN && PTY_CHAN && PORT_CHAN && NULL_CHAN)
+
+config CON_ZERO_CHAN
+ string "Default main console channel initialization"
+ default "fd:0,fd:1"
+ help
+ This is the string describing the channel to which the main console
+ will be attached by default. This value can be overridden from the
+ command line. The default value is "fd:0,fd:1", which attaches the
+ main console to stdin and stdout.
+ It is safe to leave this unchanged.
+
+config CON_CHAN
+ string "Default console channel initialization"
+ default "xterm"
+ help
+ This is the string describing the channel to which all consoles
+ except the main console will be attached by default. This value can
+ be overridden from the command line. The default value is "xterm",
+ which brings them up in xterms.
+ It is safe to leave this unchanged, although you may wish to change
+ this if you expect the UML that you build to be run in environments
+ which don't have X or xterm available.
+
+config SSL_CHAN
+ string "Default serial line channel initialization"
+ default "pty"
+ help
+ This is the string describing the channel to which the serial lines
+ will be attached by default. This value can be overridden from the
+ command line. The default value is "pty", which attaches them to
+ traditional pseudo-terminals.
+ It is safe to leave this unchanged, although you may wish to change
+ this if you expect the UML that you build to be run in environments
+ which don't have a set of /dev/pty* devices.
+
+config UML_SOUND
+ tristate "Sound support"
+ help
+ This option enables UML sound support. If enabled, it will pull in
+ soundcore and the UML hostaudio relay, which acts as a intermediary
+ between the host's dsp and mixer devices and the UML sound system.
+ It is safe to say 'Y' here.
+
+config SOUND
+ tristate
+ default UML_SOUND
+
+config SOUND_OSS_CORE
+ bool
+ default UML_SOUND
+
+config HOSTAUDIO
+ tristate
+ default UML_SOUND
+
+endmenu
+
+menu "UML Network Devices"
+ depends on NET
+
+# UML virtual driver
+config UML_NET
+ bool "Virtual network device"
+ help
+ While the User-Mode port cannot directly talk to any physical
+ hardware devices, this choice and the following transport options
+ provide one or more virtual network devices through which the UML
+ kernels can talk to each other, the host, and with the host's help,
+ machines on the outside world.
+
+ For more information, including explanations of the networking and
+ sample configurations, see
+ <http://user-mode-linux.sourceforge.net/old/networking.html>.
+
+ If you'd like to be able to enable networking in the User-Mode
+ linux environment, say Y; otherwise say N. Note that you must
+ enable at least one of the following transport options to actually
+ make use of UML networking.
+
+config UML_NET_ETHERTAP
+ bool "Ethertap transport"
+ depends on UML_NET
+ help
+ The Ethertap User-Mode Linux network transport allows a single
+ running UML to exchange packets with its host over one of the
+ host's Ethertap devices, such as /dev/tap0. Additional running
+ UMLs can use additional Ethertap devices, one per running UML.
+ While the UML believes it's on a (multi-device, broadcast) virtual
+ Ethernet network, it's in fact communicating over a point-to-point
+ link with the host.
+
+ To use this, your host kernel must have support for Ethertap
+ devices. Also, if your host kernel is 2.4.x, it must have
+ CONFIG_NETLINK_DEV configured as Y or M.
+
+ For more information, see
+ <http://user-mode-linux.sourceforge.net/old/networking.html> That site
+ has examples of the UML command line to use to enable Ethertap
+ networking.
+
+ If you'd like to set up an IP network with the host and/or the
+ outside world, say Y to this, the Daemon Transport and/or the
+ Slip Transport. You'll need at least one of them, but may choose
+ more than one without conflict. If you don't need UML networking,
+ say N.
+
+config UML_NET_TUNTAP
+ bool "TUN/TAP transport"
+ depends on UML_NET
+ help
+ The UML TUN/TAP network transport allows a UML instance to exchange
+ packets with the host over a TUN/TAP device. This option will only
+ work with a 2.4 host, unless you've applied the TUN/TAP patch to
+ your 2.2 host kernel.
+
+ To use this transport, your host kernel must have support for TUN/TAP
+ devices, either built-in or as a module.
+
+config UML_NET_SLIP
+ bool "SLIP transport"
+ depends on UML_NET
+ help
+ The slip User-Mode Linux network transport allows a running UML to
+ network with its host over a point-to-point link. Unlike Ethertap,
+ which can carry any Ethernet frame (and hence even non-IP packets),
+ the slip transport can only carry IP packets.
+
+ To use this, your host must support slip devices.
+
+ For more information, see
+ <http://user-mode-linux.sourceforge.net/old/networking.html>.
+ has examples of the UML command line to use to enable slip
+ networking, and details of a few quirks with it.
+
+ The Ethertap Transport is preferred over slip because of its
+ limitations. If you prefer slip, however, say Y here. Otherwise
+ choose the Multicast transport (to network multiple UMLs on
+ multiple hosts), Ethertap (to network with the host and the
+ outside world), and/or the Daemon transport (to network multiple
+ UMLs on a single host). You may choose more than one without
+ conflict. If you don't need UML networking, say N.
+
+config UML_NET_DAEMON
+ bool "Daemon transport"
+ depends on UML_NET
+ help
+ This User-Mode Linux network transport allows one or more running
+ UMLs on a single host to communicate with each other, but not to
+ the host.
+
+ To use this form of networking, you'll need to run the UML
+ networking daemon on the host.
+
+ For more information, see
+ <http://user-mode-linux.sourceforge.net/old/networking.html> That site
+ has examples of the UML command line to use to enable Daemon
+ networking.
+
+ If you'd like to set up a network with other UMLs on a single host,
+ say Y. If you need a network between UMLs on multiple physical
+ hosts, choose the Multicast Transport. To set up a network with
+ the host and/or other IP machines, say Y to the Ethertap or Slip
+ transports. You'll need at least one of them, but may choose
+ more than one without conflict. If you don't need UML networking,
+ say N.
+
+config UML_NET_VECTOR
+ bool "Vector I/O high performance network devices"
+ depends on UML_NET
+ help
+ This User-Mode Linux network driver uses multi-message send
+ and receive functions. The host running the UML guest must have
+ a linux kernel version above 3.0 and a libc version > 2.13.
+ This driver provides tap, raw, gre and l2tpv3 network transports
+ with up to 4 times higher network throughput than the UML network
+ drivers.
+
+config UML_NET_VDE
+ bool "VDE transport"
+ depends on UML_NET
+ help
+ This User-Mode Linux network transport allows one or more running
+ UMLs on a single host to communicate with each other and also
+ with the rest of the world using Virtual Distributed Ethernet,
+ an improved fork of uml_switch.
+
+ You must have libvdeplug installed in order to build the vde
+ transport into UML.
+
+ To use this form of networking, you will need to run vde_switch
+ on the host.
+
+ For more information, see <http://wiki.virtualsquare.org/>
+ That site has a good overview of what VDE is and also examples
+ of the UML command line to use to enable VDE networking.
+
+ If you need UML networking with VDE,
+ say Y.
+
+config UML_NET_MCAST
+ bool "Multicast transport"
+ depends on UML_NET
+ help
+ This Multicast User-Mode Linux network transport allows multiple
+ UMLs (even ones running on different host machines!) to talk to
+ each other over a virtual ethernet network. However, it requires
+ at least one UML with one of the other transports to act as a
+ bridge if any of them need to be able to talk to their hosts or any
+ other IP machines.
+
+ To use this, your host kernel(s) must support IP Multicasting.
+
+ For more information, see
+ <http://user-mode-linux.sourceforge.net/old/networking.html> That site
+ has examples of the UML command line to use to enable Multicast
+ networking, and notes about the security of this approach.
+
+ If you need UMLs on multiple physical hosts to communicate as if
+ they shared an Ethernet network, say Y. If you need to communicate
+ with other IP machines, make sure you select one of the other
+ transports (possibly in addition to Multicast; they're not
+ exclusive). If you don't need to network UMLs say N to each of
+ the transports.
+
+config UML_NET_PCAP
+ bool "pcap transport"
+ depends on UML_NET
+ help
+ The pcap transport makes a pcap packet stream on the host look
+ like an ethernet device inside UML. This is useful for making
+ UML act as a network monitor for the host. You must have libcap
+ installed in order to build the pcap transport into UML.
+
+ For more information, see
+ <http://user-mode-linux.sourceforge.net/old/networking.html> That site
+ has examples of the UML command line to use to enable this option.
+
+ If you intend to use UML as a network monitor for the host, say
+ Y here. Otherwise, say N.
+
+config UML_NET_SLIRP
+ bool "SLiRP transport"
+ depends on UML_NET
+ help
+ The SLiRP User-Mode Linux network transport allows a running UML
+ to network by invoking a program that can handle SLIP encapsulated
+ packets. This is commonly (but not limited to) the application
+ known as SLiRP, a program that can re-socket IP packets back onto
+ the host on which it is run. Only IP packets are supported,
+ unlike other network transports that can handle all Ethernet
+ frames. In general, slirp allows the UML the same IP connectivity
+ to the outside world that the host user is permitted, and unlike
+ other transports, SLiRP works without the need of root level
+ privleges, setuid binaries, or SLIP devices on the host. This
+ also means not every type of connection is possible, but most
+ situations can be accommodated with carefully crafted slirp
+ commands that can be passed along as part of the network device's
+ setup string. The effect of this transport on the UML is similar
+ that of a host behind a firewall that masquerades all network
+ connections passing through it (but is less secure).
+
+ To use this you should first have slirp compiled somewhere
+ accessible on the host, and have read its documentation. If you
+ don't need UML networking, say N.
+
+ Startup example: "eth0=slirp,FE:FD:01:02:03:04,/usr/local/bin/slirp"
+
+endmenu
diff --git a/arch/um/drivers/Makefile b/arch/um/drivers/Makefile
new file mode 100644
index 0000000..6933198
--- /dev/null
+++ b/arch/um/drivers/Makefile
@@ -0,0 +1,69 @@
+#
+# Copyright (C) 2000, 2002, 2003 Jeff Dike (jdike@karaya.com)
+# Licensed under the GPL
+#
+
+# pcap is broken in 2.5 because kbuild doesn't allow pcap.a to be linked
+# in to pcap.o
+
+slip-objs := slip_kern.o slip_user.o
+slirp-objs := slirp_kern.o slirp_user.o
+daemon-objs := daemon_kern.o daemon_user.o
+vector-objs := vector_kern.o vector_user.o vector_transports.o
+umcast-objs := umcast_kern.o umcast_user.o
+net-objs := net_kern.o net_user.o
+mconsole-objs := mconsole_kern.o mconsole_user.o
+hostaudio-objs := hostaudio_kern.o
+ubd-objs := ubd_kern.o ubd_user.o
+port-objs := port_kern.o port_user.o
+harddog-objs := harddog_kern.o harddog_user.o
+
+LDFLAGS_pcap.o := -r $(shell $(CC) $(KBUILD_CFLAGS) -print-file-name=libpcap.a)
+
+LDFLAGS_vde.o := -r $(shell $(CC) $(CFLAGS) -print-file-name=libvdeplug.a)
+
+targets := pcap_kern.o pcap_user.o vde_kern.o vde_user.o
+
+$(obj)/pcap.o: $(obj)/pcap_kern.o $(obj)/pcap_user.o
+ $(LD) -r -dp -o $@ $^ $(ld_flags)
+
+$(obj)/vde.o: $(obj)/vde_kern.o $(obj)/vde_user.o
+ $(LD) -r -dp -o $@ $^ $(ld_flags)
+
+#XXX: The call below does not work because the flags are added before the
+# object name, so nothing from the library gets linked.
+#$(call if_changed,ld)
+
+# When the above is fixed, don't forget to add this too!
+#targets += $(obj)/pcap.o
+
+obj-y := stdio_console.o fd.o chan_kern.o chan_user.o line.o
+obj-$(CONFIG_SSL) += ssl.o
+obj-$(CONFIG_STDERR_CONSOLE) += stderr_console.o
+
+obj-$(CONFIG_UML_NET_SLIP) += slip.o slip_common.o
+obj-$(CONFIG_UML_NET_SLIRP) += slirp.o slip_common.o
+obj-$(CONFIG_UML_NET_DAEMON) += daemon.o
+obj-$(CONFIG_UML_NET_VECTOR) += vector.o
+obj-$(CONFIG_UML_NET_VDE) += vde.o
+obj-$(CONFIG_UML_NET_MCAST) += umcast.o
+obj-$(CONFIG_UML_NET_PCAP) += pcap.o
+obj-$(CONFIG_UML_NET) += net.o
+obj-$(CONFIG_MCONSOLE) += mconsole.o
+obj-$(CONFIG_MMAPPER) += mmapper_kern.o
+obj-$(CONFIG_BLK_DEV_UBD) += ubd.o
+obj-$(CONFIG_HOSTAUDIO) += hostaudio.o
+obj-$(CONFIG_NULL_CHAN) += null.o
+obj-$(CONFIG_PORT_CHAN) += port.o
+obj-$(CONFIG_PTY_CHAN) += pty.o
+obj-$(CONFIG_TTY_CHAN) += tty.o
+obj-$(CONFIG_XTERM_CHAN) += xterm.o xterm_kern.o
+obj-$(CONFIG_UML_WATCHDOG) += harddog.o
+obj-$(CONFIG_BLK_DEV_COW_COMMON) += cow_user.o
+obj-$(CONFIG_UML_RANDOM) += random.o
+
+# pcap_user.o must be added explicitly.
+USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o pcap_user.o vde_user.o vector_user.o
+CFLAGS_null.o = -DDEV_NULL=$(DEV_NULL_PATH)
+
+include arch/um/scripts/Makefile.rules
diff --git a/arch/um/drivers/chan.h b/arch/um/drivers/chan.h
new file mode 100644
index 0000000..c512b03
--- /dev/null
+++ b/arch/um/drivers/chan.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __CHAN_KERN_H__
+#define __CHAN_KERN_H__
+
+#include <linux/tty.h>
+#include <linux/list.h>
+#include <linux/console.h>
+#include "chan_user.h"
+#include "line.h"
+
+struct chan {
+ struct list_head list;
+ struct list_head free_list;
+ struct line *line;
+ char *dev;
+ unsigned int primary:1;
+ unsigned int input:1;
+ unsigned int output:1;
+ unsigned int opened:1;
+ unsigned int enabled:1;
+ int fd;
+ const struct chan_ops *ops;
+ void *data;
+};
+
+extern void chan_interrupt(struct line *line, int irq);
+extern int parse_chan_pair(char *str, struct line *line, int device,
+ const struct chan_opts *opts, char **error_out);
+extern int write_chan(struct chan *chan, const char *buf, int len,
+ int write_irq);
+extern int console_write_chan(struct chan *chan, const char *buf,
+ int len);
+extern int console_open_chan(struct line *line, struct console *co);
+extern void deactivate_chan(struct chan *chan, int irq);
+extern void reactivate_chan(struct chan *chan, int irq);
+extern void chan_enable_winch(struct chan *chan, struct tty_port *port);
+extern int enable_chan(struct line *line);
+extern void close_chan(struct line *line);
+extern int chan_window_size(struct line *line,
+ unsigned short *rows_out,
+ unsigned short *cols_out);
+extern int chan_config_string(struct line *line, char *str, int size,
+ char **error_out);
+
+#endif
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
new file mode 100644
index 0000000..05588f9
--- /dev/null
+++ b/arch/um/drivers/chan_kern.c
@@ -0,0 +1,544 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include "chan.h"
+#include <os.h>
+#include <irq_kern.h>
+
+#ifdef CONFIG_NOCONFIG_CHAN
+static void *not_configged_init(char *str, int device,
+ const struct chan_opts *opts)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return NULL;
+}
+
+static int not_configged_open(int input, int output, int primary, void *data,
+ char **dev_out)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return -ENODEV;
+}
+
+static void not_configged_close(int fd, void *data)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+}
+
+static int not_configged_read(int fd, char *c_out, void *data)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return -EIO;
+}
+
+static int not_configged_write(int fd, const char *buf, int len, void *data)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return -EIO;
+}
+
+static int not_configged_console_write(int fd, const char *buf, int len)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return -EIO;
+}
+
+static int not_configged_window_size(int fd, void *data, unsigned short *rows,
+ unsigned short *cols)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return -ENODEV;
+}
+
+static void not_configged_free(void *data)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+}
+
+static const struct chan_ops not_configged_ops = {
+ .init = not_configged_init,
+ .open = not_configged_open,
+ .close = not_configged_close,
+ .read = not_configged_read,
+ .write = not_configged_write,
+ .console_write = not_configged_console_write,
+ .window_size = not_configged_window_size,
+ .free = not_configged_free,
+ .winch = 0,
+};
+#endif /* CONFIG_NOCONFIG_CHAN */
+
+static int open_one_chan(struct chan *chan)
+{
+ int fd, err;
+
+ if (chan->opened)
+ return 0;
+
+ if (chan->ops->open == NULL)
+ fd = 0;
+ else fd = (*chan->ops->open)(chan->input, chan->output, chan->primary,
+ chan->data, &chan->dev);
+ if (fd < 0)
+ return fd;
+
+ err = os_set_fd_block(fd, 0);
+ if (err) {
+ (*chan->ops->close)(fd, chan->data);
+ return err;
+ }
+
+ chan->fd = fd;
+
+ chan->opened = 1;
+ return 0;
+}
+
+static int open_chan(struct list_head *chans)
+{
+ struct list_head *ele;
+ struct chan *chan;
+ int ret, err = 0;
+
+ list_for_each(ele, chans) {
+ chan = list_entry(ele, struct chan, list);
+ ret = open_one_chan(chan);
+ if (chan->primary)
+ err = ret;
+ }
+ return err;
+}
+
+void chan_enable_winch(struct chan *chan, struct tty_port *port)
+{
+ if (chan && chan->primary && chan->ops->winch)
+ register_winch(chan->fd, port);
+}
+
+static void line_timer_cb(struct work_struct *work)
+{
+ struct line *line = container_of(work, struct line, task.work);
+
+ if (!line->throttled)
+ chan_interrupt(line, line->driver->read_irq);
+}
+
+int enable_chan(struct line *line)
+{
+ struct list_head *ele;
+ struct chan *chan;
+ int err;
+
+ INIT_DELAYED_WORK(&line->task, line_timer_cb);
+
+ list_for_each(ele, &line->chan_list) {
+ chan = list_entry(ele, struct chan, list);
+ err = open_one_chan(chan);
+ if (err) {
+ if (chan->primary)
+ goto out_close;
+
+ continue;
+ }
+
+ if (chan->enabled)
+ continue;
+ err = line_setup_irq(chan->fd, chan->input, chan->output, line,
+ chan);
+ if (err)
+ goto out_close;
+
+ chan->enabled = 1;
+ }
+
+ return 0;
+
+ out_close:
+ close_chan(line);
+ return err;
+}
+
+static void close_one_chan(struct chan *chan, int delay_free_irq)
+{
+ if (!chan->opened)
+ return;
+
+ /* we can safely call free now - it will be marked
+ * as free and freed once the IRQ stopped processing
+ */
+ if (chan->input && chan->enabled)
+ um_free_irq(chan->line->driver->read_irq, chan);
+ if (chan->output && chan->enabled)
+ um_free_irq(chan->line->driver->write_irq, chan);
+ chan->enabled = 0;
+ if (chan->ops->close != NULL)
+ (*chan->ops->close)(chan->fd, chan->data);
+
+ chan->opened = 0;
+ chan->fd = -1;
+}
+
+void close_chan(struct line *line)
+{
+ struct chan *chan;
+
+ /* Close in reverse order as open in case more than one of them
+ * refers to the same device and they save and restore that device's
+ * state. Then, the first one opened will have the original state,
+ * so it must be the last closed.
+ */
+ list_for_each_entry_reverse(chan, &line->chan_list, list) {
+ close_one_chan(chan, 0);
+ }
+}
+
+void deactivate_chan(struct chan *chan, int irq)
+{
+ if (chan && chan->enabled)
+ deactivate_fd(chan->fd, irq);
+}
+
+void reactivate_chan(struct chan *chan, int irq)
+{
+ if (chan && chan->enabled)
+ reactivate_fd(chan->fd, irq);
+}
+
+int write_chan(struct chan *chan, const char *buf, int len,
+ int write_irq)
+{
+ int n, ret = 0;
+
+ if (len == 0 || !chan || !chan->ops->write)
+ return 0;
+
+ n = chan->ops->write(chan->fd, buf, len, chan->data);
+ if (chan->primary) {
+ ret = n;
+ if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len)))
+ reactivate_fd(chan->fd, write_irq);
+ }
+ return ret;
+}
+
+int console_write_chan(struct chan *chan, const char *buf, int len)
+{
+ int n, ret = 0;
+
+ if (!chan || !chan->ops->console_write)
+ return 0;
+
+ n = chan->ops->console_write(chan->fd, buf, len);
+ if (chan->primary)
+ ret = n;
+ return ret;
+}
+
+int console_open_chan(struct line *line, struct console *co)
+{
+ int err;
+
+ err = open_chan(&line->chan_list);
+ if (err)
+ return err;
+
+ printk(KERN_INFO "Console initialized on /dev/%s%d\n", co->name,
+ co->index);
+ return 0;
+}
+
+int chan_window_size(struct line *line, unsigned short *rows_out,
+ unsigned short *cols_out)
+{
+ struct chan *chan;
+
+ chan = line->chan_in;
+ if (chan && chan->primary) {
+ if (chan->ops->window_size == NULL)
+ return 0;
+ return chan->ops->window_size(chan->fd, chan->data,
+ rows_out, cols_out);
+ }
+ chan = line->chan_out;
+ if (chan && chan->primary) {
+ if (chan->ops->window_size == NULL)
+ return 0;
+ return chan->ops->window_size(chan->fd, chan->data,
+ rows_out, cols_out);
+ }
+ return 0;
+}
+
+static void free_one_chan(struct chan *chan)
+{
+ list_del(&chan->list);
+
+ close_one_chan(chan, 0);
+
+ if (chan->ops->free != NULL)
+ (*chan->ops->free)(chan->data);
+
+ if (chan->primary && chan->output)
+ ignore_sigio_fd(chan->fd);
+ kfree(chan);
+}
+
+static void free_chan(struct list_head *chans)
+{
+ struct list_head *ele, *next;
+ struct chan *chan;
+
+ list_for_each_safe(ele, next, chans) {
+ chan = list_entry(ele, struct chan, list);
+ free_one_chan(chan);
+ }
+}
+
+static int one_chan_config_string(struct chan *chan, char *str, int size,
+ char **error_out)
+{
+ int n = 0;
+
+ if (chan == NULL) {
+ CONFIG_CHUNK(str, size, n, "none", 1);
+ return n;
+ }
+
+ CONFIG_CHUNK(str, size, n, chan->ops->type, 0);
+
+ if (chan->dev == NULL) {
+ CONFIG_CHUNK(str, size, n, "", 1);
+ return n;
+ }
+
+ CONFIG_CHUNK(str, size, n, ":", 0);
+ CONFIG_CHUNK(str, size, n, chan->dev, 0);
+
+ return n;
+}
+
+static int chan_pair_config_string(struct chan *in, struct chan *out,
+ char *str, int size, char **error_out)
+{
+ int n;
+
+ n = one_chan_config_string(in, str, size, error_out);
+ str += n;
+ size -= n;
+
+ if (in == out) {
+ CONFIG_CHUNK(str, size, n, "", 1);
+ return n;
+ }
+
+ CONFIG_CHUNK(str, size, n, ",", 1);
+ n = one_chan_config_string(out, str, size, error_out);
+ str += n;
+ size -= n;
+ CONFIG_CHUNK(str, size, n, "", 1);
+
+ return n;
+}
+
+int chan_config_string(struct line *line, char *str, int size,
+ char **error_out)
+{
+ struct chan *in = line->chan_in, *out = line->chan_out;
+
+ if (in && !in->primary)
+ in = NULL;
+ if (out && !out->primary)
+ out = NULL;
+
+ return chan_pair_config_string(in, out, str, size, error_out);
+}
+
+struct chan_type {
+ char *key;
+ const struct chan_ops *ops;
+};
+
+static const struct chan_type chan_table[] = {
+ { "fd", &fd_ops },
+
+#ifdef CONFIG_NULL_CHAN
+ { "null", &null_ops },
+#else
+ { "null", ¬_configged_ops },
+#endif
+
+#ifdef CONFIG_PORT_CHAN
+ { "port", &port_ops },
+#else
+ { "port", ¬_configged_ops },
+#endif
+
+#ifdef CONFIG_PTY_CHAN
+ { "pty", &pty_ops },
+ { "pts", &pts_ops },
+#else
+ { "pty", ¬_configged_ops },
+ { "pts", ¬_configged_ops },
+#endif
+
+#ifdef CONFIG_TTY_CHAN
+ { "tty", &tty_ops },
+#else
+ { "tty", ¬_configged_ops },
+#endif
+
+#ifdef CONFIG_XTERM_CHAN
+ { "xterm", &xterm_ops },
+#else
+ { "xterm", ¬_configged_ops },
+#endif
+};
+
+static struct chan *parse_chan(struct line *line, char *str, int device,
+ const struct chan_opts *opts, char **error_out)
+{
+ const struct chan_type *entry;
+ const struct chan_ops *ops;
+ struct chan *chan;
+ void *data;
+ int i;
+
+ ops = NULL;
+ data = NULL;
+ for(i = 0; i < ARRAY_SIZE(chan_table); i++) {
+ entry = &chan_table[i];
+ if (!strncmp(str, entry->key, strlen(entry->key))) {
+ ops = entry->ops;
+ str += strlen(entry->key);
+ break;
+ }
+ }
+ if (ops == NULL) {
+ *error_out = "No match for configured backends";
+ return NULL;
+ }
+
+ data = (*ops->init)(str, device, opts);
+ if (data == NULL) {
+ *error_out = "Configuration failed";
+ return NULL;
+ }
+
+ chan = kmalloc(sizeof(*chan), GFP_ATOMIC);
+ if (chan == NULL) {
+ *error_out = "Memory allocation failed";
+ return NULL;
+ }
+ *chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list),
+ .free_list =
+ LIST_HEAD_INIT(chan->free_list),
+ .line = line,
+ .primary = 1,
+ .input = 0,
+ .output = 0,
+ .opened = 0,
+ .enabled = 0,
+ .fd = -1,
+ .ops = ops,
+ .data = data });
+ return chan;
+}
+
+int parse_chan_pair(char *str, struct line *line, int device,
+ const struct chan_opts *opts, char **error_out)
+{
+ struct list_head *chans = &line->chan_list;
+ struct chan *new;
+ char *in, *out;
+
+ if (!list_empty(chans)) {
+ line->chan_in = line->chan_out = NULL;
+ free_chan(chans);
+ INIT_LIST_HEAD(chans);
+ }
+
+ if (!str)
+ return 0;
+
+ out = strchr(str, ',');
+ if (out != NULL) {
+ in = str;
+ *out = '\0';
+ out++;
+ new = parse_chan(line, in, device, opts, error_out);
+ if (new == NULL)
+ return -1;
+
+ new->input = 1;
+ list_add(&new->list, chans);
+ line->chan_in = new;
+
+ new = parse_chan(line, out, device, opts, error_out);
+ if (new == NULL)
+ return -1;
+
+ list_add(&new->list, chans);
+ new->output = 1;
+ line->chan_out = new;
+ }
+ else {
+ new = parse_chan(line, str, device, opts, error_out);
+ if (new == NULL)
+ return -1;
+
+ list_add(&new->list, chans);
+ new->input = 1;
+ new->output = 1;
+ line->chan_in = line->chan_out = new;
+ }
+ return 0;
+}
+
+void chan_interrupt(struct line *line, int irq)
+{
+ struct tty_port *port = &line->port;
+ struct chan *chan = line->chan_in;
+ int err;
+ char c;
+
+ if (!chan || !chan->ops->read)
+ goto out;
+
+ do {
+ if (!tty_buffer_request_room(port, 1)) {
+ schedule_delayed_work(&line->task, 1);
+ goto out;
+ }
+ err = chan->ops->read(chan->fd, &c, chan->data);
+ if (err > 0)
+ tty_insert_flip_char(port, c, TTY_NORMAL);
+ } while (err > 0);
+
+ if (err == 0)
+ reactivate_fd(chan->fd, irq);
+ if (err == -EIO) {
+ if (chan->primary) {
+ tty_port_tty_hangup(&line->port, false);
+ if (line->chan_out != chan)
+ close_one_chan(line->chan_out, 1);
+ }
+ close_one_chan(chan, 1);
+ if (chan->primary)
+ return;
+ }
+ out:
+ tty_flip_buffer_push(port);
+}
diff --git a/arch/um/drivers/chan_user.c b/arch/um/drivers/chan_user.c
new file mode 100644
index 0000000..3fd7c3e
--- /dev/null
+++ b/arch/um/drivers/chan_user.c
@@ -0,0 +1,301 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sched.h>
+#include <signal.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+#include "chan_user.h"
+#include <os.h>
+#include <um_malloc.h>
+
+void generic_close(int fd, void *unused)
+{
+ close(fd);
+}
+
+int generic_read(int fd, char *c_out, void *unused)
+{
+ int n;
+
+ n = read(fd, c_out, sizeof(*c_out));
+ if (n > 0)
+ return n;
+ else if (errno == EAGAIN)
+ return 0;
+ else if (n == 0)
+ return -EIO;
+ return -errno;
+}
+
+/* XXX Trivial wrapper around write */
+
+int generic_write(int fd, const char *buf, int n, void *unused)
+{
+ int err;
+
+ err = write(fd, buf, n);
+ if (err > 0)
+ return err;
+ else if (errno == EAGAIN)
+ return 0;
+ else if (err == 0)
+ return -EIO;
+ return -errno;
+}
+
+int generic_window_size(int fd, void *unused, unsigned short *rows_out,
+ unsigned short *cols_out)
+{
+ struct winsize size;
+ int ret;
+
+ if (ioctl(fd, TIOCGWINSZ, &size) < 0)
+ return -errno;
+
+ ret = ((*rows_out != size.ws_row) || (*cols_out != size.ws_col));
+
+ *rows_out = size.ws_row;
+ *cols_out = size.ws_col;
+
+ return ret;
+}
+
+void generic_free(void *data)
+{
+ kfree(data);
+}
+
+int generic_console_write(int fd, const char *buf, int n)
+{
+ sigset_t old, no_sigio;
+ struct termios save, new;
+ int err;
+
+ if (isatty(fd)) {
+ sigemptyset(&no_sigio);
+ sigaddset(&no_sigio, SIGIO);
+ if (sigprocmask(SIG_BLOCK, &no_sigio, &old))
+ goto error;
+
+ CATCH_EINTR(err = tcgetattr(fd, &save));
+ if (err)
+ goto error;
+ new = save;
+ /*
+ * The terminal becomes a bit less raw, to handle \n also as
+ * "Carriage Return", not only as "New Line". Otherwise, the new
+ * line won't start at the first column.
+ */
+ new.c_oflag |= OPOST;
+ CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &new));
+ if (err)
+ goto error;
+ }
+ err = generic_write(fd, buf, n, NULL);
+ /*
+ * Restore raw mode, in any case; we *must* ignore any error apart
+ * EINTR, except for debug.
+ */
+ if (isatty(fd)) {
+ CATCH_EINTR(tcsetattr(fd, TCSAFLUSH, &save));
+ sigprocmask(SIG_SETMASK, &old, NULL);
+ }
+
+ return err;
+error:
+ return -errno;
+}
+
+/*
+ * UML SIGWINCH handling
+ *
+ * The point of this is to handle SIGWINCH on consoles which have host
+ * ttys and relay them inside UML to whatever might be running on the
+ * console and cares about the window size (since SIGWINCH notifies
+ * about terminal size changes).
+ *
+ * So, we have a separate thread for each host tty attached to a UML
+ * device (side-issue - I'm annoyed that one thread can't have
+ * multiple controlling ttys for the purpose of handling SIGWINCH, but
+ * I imagine there are other reasons that doesn't make any sense).
+ *
+ * SIGWINCH can't be received synchronously, so you have to set up to
+ * receive it as a signal. That being the case, if you are going to
+ * wait for it, it is convenient to sit in sigsuspend() and wait for
+ * the signal to bounce you out of it (see below for how we make sure
+ * to exit only on SIGWINCH).
+ */
+
+static void winch_handler(int sig)
+{
+}
+
+struct winch_data {
+ int pty_fd;
+ int pipe_fd;
+};
+
+static int winch_thread(void *arg)
+{
+ struct winch_data *data = arg;
+ sigset_t sigs;
+ int pty_fd, pipe_fd;
+ int count;
+ char c = 1;
+
+ pty_fd = data->pty_fd;
+ pipe_fd = data->pipe_fd;
+ count = write(pipe_fd, &c, sizeof(c));
+ if (count != sizeof(c))
+ printk(UM_KERN_ERR "winch_thread : failed to write "
+ "synchronization byte, err = %d\n", -count);
+
+ /*
+ * We are not using SIG_IGN on purpose, so don't fix it as I thought to
+ * do! If using SIG_IGN, the sigsuspend() call below would not stop on
+ * SIGWINCH.
+ */
+
+ signal(SIGWINCH, winch_handler);
+ sigfillset(&sigs);
+ /* Block all signals possible. */
+ if (sigprocmask(SIG_SETMASK, &sigs, NULL) < 0) {
+ printk(UM_KERN_ERR "winch_thread : sigprocmask failed, "
+ "errno = %d\n", errno);
+ exit(1);
+ }
+ /* In sigsuspend(), block anything else than SIGWINCH. */
+ sigdelset(&sigs, SIGWINCH);
+
+ if (setsid() < 0) {
+ printk(UM_KERN_ERR "winch_thread : setsid failed, errno = %d\n",
+ errno);
+ exit(1);
+ }
+
+ if (ioctl(pty_fd, TIOCSCTTY, 0) < 0) {
+ printk(UM_KERN_ERR "winch_thread : TIOCSCTTY failed on "
+ "fd %d err = %d\n", pty_fd, errno);
+ exit(1);
+ }
+
+ if (tcsetpgrp(pty_fd, os_getpid()) < 0) {
+ printk(UM_KERN_ERR "winch_thread : tcsetpgrp failed on "
+ "fd %d err = %d\n", pty_fd, errno);
+ exit(1);
+ }
+
+ /*
+ * These are synchronization calls between various UML threads on the
+ * host - since they are not different kernel threads, we cannot use
+ * kernel semaphores. We don't use SysV semaphores because they are
+ * persistent.
+ */
+ count = read(pipe_fd, &c, sizeof(c));
+ if (count != sizeof(c))
+ printk(UM_KERN_ERR "winch_thread : failed to read "
+ "synchronization byte, err = %d\n", errno);
+
+ while(1) {
+ /*
+ * This will be interrupted by SIGWINCH only, since
+ * other signals are blocked.
+ */
+ sigsuspend(&sigs);
+
+ count = write(pipe_fd, &c, sizeof(c));
+ if (count != sizeof(c))
+ printk(UM_KERN_ERR "winch_thread : write failed, "
+ "err = %d\n", errno);
+ }
+}
+
+static int winch_tramp(int fd, struct tty_port *port, int *fd_out,
+ unsigned long *stack_out)
+{
+ struct winch_data data;
+ int fds[2], n, err;
+ char c;
+
+ err = os_pipe(fds, 1, 1);
+ if (err < 0) {
+ printk(UM_KERN_ERR "winch_tramp : os_pipe failed, err = %d\n",
+ -err);
+ goto out;
+ }
+
+ data = ((struct winch_data) { .pty_fd = fd,
+ .pipe_fd = fds[1] } );
+ /*
+ * CLONE_FILES so this thread doesn't hold open files which are open
+ * now, but later closed in a different thread. This is a
+ * problem with /dev/net/tun, which if held open by this
+ * thread, prevents the TUN/TAP device from being reused.
+ */
+ err = run_helper_thread(winch_thread, &data, CLONE_FILES, stack_out);
+ if (err < 0) {
+ printk(UM_KERN_ERR "fork of winch_thread failed - errno = %d\n",
+ -err);
+ goto out_close;
+ }
+
+ *fd_out = fds[0];
+ n = read(fds[0], &c, sizeof(c));
+ if (n != sizeof(c)) {
+ printk(UM_KERN_ERR "winch_tramp : failed to read "
+ "synchronization byte\n");
+ printk(UM_KERN_ERR "read failed, err = %d\n", errno);
+ printk(UM_KERN_ERR "fd %d will not support SIGWINCH\n", fd);
+ err = -EINVAL;
+ goto out_close;
+ }
+
+ if (os_set_fd_block(*fd_out, 0)) {
+ printk(UM_KERN_ERR "winch_tramp: failed to set thread_fd "
+ "non-blocking.\n");
+ goto out_close;
+ }
+
+ return err;
+
+ out_close:
+ close(fds[1]);
+ close(fds[0]);
+ out:
+ return err;
+}
+
+void register_winch(int fd, struct tty_port *port)
+{
+ unsigned long stack;
+ int pid, thread, count, thread_fd = -1;
+ char c = 1;
+
+ if (!isatty(fd))
+ return;
+
+ pid = tcgetpgrp(fd);
+ if (is_skas_winch(pid, fd, port)) {
+ register_winch_irq(-1, fd, -1, port, 0);
+ return;
+ }
+
+ if (pid == -1) {
+ thread = winch_tramp(fd, port, &thread_fd, &stack);
+ if (thread < 0)
+ return;
+
+ register_winch_irq(thread_fd, fd, thread, port, stack);
+
+ count = write(thread_fd, &c, sizeof(c));
+ if (count != sizeof(c))
+ printk(UM_KERN_ERR "register_winch : failed to write "
+ "synchronization byte, err = %d\n", errno);
+ }
+}
diff --git a/arch/um/drivers/chan_user.h b/arch/um/drivers/chan_user.h
new file mode 100644
index 0000000..03f1b56
--- /dev/null
+++ b/arch/um/drivers/chan_user.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __CHAN_USER_H__
+#define __CHAN_USER_H__
+
+#include <init.h>
+
+struct chan_opts {
+ void (*const announce)(char *dev_name, int dev);
+ char *xterm_title;
+ const int raw;
+};
+
+struct chan_ops {
+ char *type;
+ void *(*init)(char *, int, const struct chan_opts *);
+ int (*open)(int, int, int, void *, char **);
+ void (*close)(int, void *);
+ int (*read)(int, char *, void *);
+ int (*write)(int, const char *, int, void *);
+ int (*console_write)(int, const char *, int);
+ int (*window_size)(int, void *, unsigned short *, unsigned short *);
+ void (*free)(void *);
+ int winch;
+};
+
+extern const struct chan_ops fd_ops, null_ops, port_ops, pts_ops, pty_ops,
+ tty_ops, xterm_ops;
+
+extern void generic_close(int fd, void *unused);
+extern int generic_read(int fd, char *c_out, void *unused);
+extern int generic_write(int fd, const char *buf, int n, void *unused);
+extern int generic_console_write(int fd, const char *buf, int n);
+extern int generic_window_size(int fd, void *unused, unsigned short *rows_out,
+ unsigned short *cols_out);
+extern void generic_free(void *data);
+
+struct tty_port;
+extern void register_winch(int fd, struct tty_port *port);
+extern void register_winch_irq(int fd, int tty_fd, int pid,
+ struct tty_port *port, unsigned long stack);
+
+#define __channel_help(fn, prefix) \
+__uml_help(fn, prefix "[0-9]*=<channel description>\n" \
+" Attach a console or serial line to a host channel. See\n" \
+" http://user-mode-linux.sourceforge.net/old/input.html for a complete\n" \
+" description of this switch.\n\n" \
+);
+
+#endif
diff --git a/arch/um/drivers/cow.h b/arch/um/drivers/cow.h
new file mode 100644
index 0000000..760c507
--- /dev/null
+++ b/arch/um/drivers/cow.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __COW_H__
+#define __COW_H__
+
+#include <asm/types.h>
+
+extern int init_cow_file(int fd, char *cow_file, char *backing_file,
+ int sectorsize, int alignment, int *bitmap_offset_out,
+ unsigned long *bitmap_len_out, int *data_offset_out);
+
+extern int file_reader(__u64 offset, char *buf, int len, void *arg);
+extern int read_cow_header(int (*reader)(__u64, char *, int, void *),
+ void *arg, __u32 *version_out,
+ char **backing_file_out, time_t *mtime_out,
+ unsigned long long *size_out, int *sectorsize_out,
+ __u32 *align_out, int *bitmap_offset_out);
+
+extern int write_cow_header(char *cow_file, int fd, char *backing_file,
+ int sectorsize, int alignment,
+ unsigned long long *size);
+
+extern void cow_sizes(int version, __u64 size, int sectorsize, int align,
+ int bitmap_offset, unsigned long *bitmap_len_out,
+ int *data_offset_out);
+
+#endif
+
+/*
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/cow_sys.h b/arch/um/drivers/cow_sys.h
new file mode 100644
index 0000000..916811e
--- /dev/null
+++ b/arch/um/drivers/cow_sys.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __COW_SYS_H__
+#define __COW_SYS_H__
+
+#include <kern_util.h>
+#include <os.h>
+#include <um_malloc.h>
+
+static inline void *cow_malloc(int size)
+{
+ return uml_kmalloc(size, UM_GFP_KERNEL);
+}
+
+static inline void cow_free(void *ptr)
+{
+ kfree(ptr);
+}
+
+#define cow_printf printk
+
+static inline char *cow_strdup(char *str)
+{
+ return uml_strdup(str);
+}
+
+static inline int cow_seek_file(int fd, __u64 offset)
+{
+ return os_seek_file(fd, offset);
+}
+
+static inline int cow_file_size(char *file, unsigned long long *size_out)
+{
+ return os_file_size(file, size_out);
+}
+
+static inline int cow_write_file(int fd, void *buf, int size)
+{
+ return os_write_file(fd, buf, size);
+}
+
+#endif
diff --git a/arch/um/drivers/cow_user.c b/arch/um/drivers/cow_user.c
new file mode 100644
index 0000000..0ee9cc6
--- /dev/null
+++ b/arch/um/drivers/cow_user.c
@@ -0,0 +1,443 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+/*
+ * _XOPEN_SOURCE is needed for pread, but we define _GNU_SOURCE, which defines
+ * that.
+ */
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <endian.h>
+#include "cow.h"
+#include "cow_sys.h"
+
+#define PATH_LEN_V1 256
+
+typedef __u32 time32_t;
+
+struct cow_header_v1 {
+ __s32 magic;
+ __s32 version;
+ char backing_file[PATH_LEN_V1];
+ time32_t mtime;
+ __u64 size;
+ __s32 sectorsize;
+} __attribute__((packed));
+
+/*
+ * Define PATH_LEN_V3 as the usual value of MAXPATHLEN, just hard-code it in
+ * case other systems have different values for MAXPATHLEN.
+ *
+ * The same must hold for V2 - we want file format compatibility, not anything
+ * else.
+ */
+#define PATH_LEN_V3 4096
+#define PATH_LEN_V2 PATH_LEN_V3
+
+struct cow_header_v2 {
+ __u32 magic;
+ __u32 version;
+ char backing_file[PATH_LEN_V2];
+ time32_t mtime;
+ __u64 size;
+ __s32 sectorsize;
+} __attribute__((packed));
+
+/*
+ * Changes from V2 -
+ * PATH_LEN_V3 as described above
+ * Explicitly specify field bit lengths for systems with different
+ * lengths for the usual C types. Not sure whether char or
+ * time_t should be changed, this can be changed later without
+ * breaking compatibility
+ * Add alignment field so that different alignments can be used for the
+ * bitmap and data
+ * Add cow_format field to allow for the possibility of different ways
+ * of specifying the COW blocks. For now, the only value is 0,
+ * for the traditional COW bitmap.
+ * Move the backing_file field to the end of the header. This allows
+ * for the possibility of expanding it into the padding required
+ * by the bitmap alignment.
+ * The bitmap and data portions of the file will be aligned as specified
+ * by the alignment field. This is to allow COW files to be
+ * put on devices with restrictions on access alignments, such as
+ * /dev/raw, with a 512 byte alignment restriction. This also
+ * allows the data to be more aligned more strictly than on
+ * sector boundaries. This is needed for ubd-mmap, which needs
+ * the data to be page aligned.
+ * Fixed (finally!) the rounding bug
+ */
+
+/*
+ * Until Dec2005, __attribute__((packed)) was left out from the below
+ * definition, leading on 64-bit systems to 4 bytes of padding after mtime, to
+ * align size to 8-byte alignment. This shifted all fields above (no padding
+ * was present on 32-bit, no other padding was added).
+ *
+ * However, this _can be detected_: it means that cow_format (always 0 until
+ * now) is shifted onto the first 4 bytes of backing_file, where it is otherwise
+ * impossible to find 4 zeros. -bb */
+
+struct cow_header_v3 {
+ __u32 magic;
+ __u32 version;
+ __u32 mtime;
+ __u64 size;
+ __u32 sectorsize;
+ __u32 alignment;
+ __u32 cow_format;
+ char backing_file[PATH_LEN_V3];
+} __attribute__((packed));
+
+/* This is the broken layout used by some 64-bit binaries. */
+struct cow_header_v3_broken {
+ __u32 magic;
+ __u32 version;
+ __s64 mtime;
+ __u64 size;
+ __u32 sectorsize;
+ __u32 alignment;
+ __u32 cow_format;
+ char backing_file[PATH_LEN_V3];
+};
+
+/* COW format definitions - for now, we have only the usual COW bitmap */
+#define COW_BITMAP 0
+
+union cow_header {
+ struct cow_header_v1 v1;
+ struct cow_header_v2 v2;
+ struct cow_header_v3 v3;
+ struct cow_header_v3_broken v3_b;
+};
+
+#define COW_MAGIC 0x4f4f4f4d /* MOOO */
+#define COW_VERSION 3
+
+#define DIV_ROUND(x, len) (((x) + (len) - 1) / (len))
+#define ROUND_UP(x, align) DIV_ROUND(x, align) * (align)
+
+void cow_sizes(int version, __u64 size, int sectorsize, int align,
+ int bitmap_offset, unsigned long *bitmap_len_out,
+ int *data_offset_out)
+{
+ if (version < 3) {
+ *bitmap_len_out = (size + sectorsize - 1) / (8 * sectorsize);
+
+ *data_offset_out = bitmap_offset + *bitmap_len_out;
+ *data_offset_out = (*data_offset_out + sectorsize - 1) /
+ sectorsize;
+ *data_offset_out *= sectorsize;
+ }
+ else {
+ *bitmap_len_out = DIV_ROUND(size, sectorsize);
+ *bitmap_len_out = DIV_ROUND(*bitmap_len_out, 8);
+
+ *data_offset_out = bitmap_offset + *bitmap_len_out;
+ *data_offset_out = ROUND_UP(*data_offset_out, align);
+ }
+}
+
+static int absolutize(char *to, int size, char *from)
+{
+ char save_cwd[256], *slash;
+ int remaining;
+
+ if (getcwd(save_cwd, sizeof(save_cwd)) == NULL) {
+ cow_printf("absolutize : unable to get cwd - errno = %d\n",
+ errno);
+ return -1;
+ }
+ slash = strrchr(from, '/');
+ if (slash != NULL) {
+ *slash = '\0';
+ if (chdir(from)) {
+ *slash = '/';
+ cow_printf("absolutize : Can't cd to '%s' - "
+ "errno = %d\n", from, errno);
+ return -1;
+ }
+ *slash = '/';
+ if (getcwd(to, size) == NULL) {
+ cow_printf("absolutize : unable to get cwd of '%s' - "
+ "errno = %d\n", from, errno);
+ return -1;
+ }
+ remaining = size - strlen(to);
+ if (strlen(slash) + 1 > remaining) {
+ cow_printf("absolutize : unable to fit '%s' into %d "
+ "chars\n", from, size);
+ return -1;
+ }
+ strcat(to, slash);
+ }
+ else {
+ if (strlen(save_cwd) + 1 + strlen(from) + 1 > size) {
+ cow_printf("absolutize : unable to fit '%s' into %d "
+ "chars\n", from, size);
+ return -1;
+ }
+ strcpy(to, save_cwd);
+ strcat(to, "/");
+ strcat(to, from);
+ }
+ if (chdir(save_cwd)) {
+ cow_printf("absolutize : Can't cd to '%s' - "
+ "errno = %d\n", save_cwd, errno);
+ return -1;
+ }
+ return 0;
+}
+
+int write_cow_header(char *cow_file, int fd, char *backing_file,
+ int sectorsize, int alignment, unsigned long long *size)
+{
+ struct cow_header_v3 *header;
+ unsigned long modtime;
+ int err;
+
+ err = cow_seek_file(fd, 0);
+ if (err < 0) {
+ cow_printf("write_cow_header - lseek failed, err = %d\n", -err);
+ goto out;
+ }
+
+ err = -ENOMEM;
+ header = cow_malloc(sizeof(*header));
+ if (header == NULL) {
+ cow_printf("write_cow_header - failed to allocate COW V3 "
+ "header\n");
+ goto out;
+ }
+ header->magic = htobe32(COW_MAGIC);
+ header->version = htobe32(COW_VERSION);
+
+ err = -EINVAL;
+ if (strlen(backing_file) > sizeof(header->backing_file) - 1) {
+ /* Below, %zd is for a size_t value */
+ cow_printf("Backing file name \"%s\" is too long - names are "
+ "limited to %zd characters\n", backing_file,
+ sizeof(header->backing_file) - 1);
+ goto out_free;
+ }
+
+ if (absolutize(header->backing_file, sizeof(header->backing_file),
+ backing_file))
+ goto out_free;
+
+ err = os_file_modtime(header->backing_file, &modtime);
+ if (err < 0) {
+ cow_printf("write_cow_header - backing file '%s' mtime "
+ "request failed, err = %d\n", header->backing_file,
+ -err);
+ goto out_free;
+ }
+
+ err = cow_file_size(header->backing_file, size);
+ if (err < 0) {
+ cow_printf("write_cow_header - couldn't get size of "
+ "backing file '%s', err = %d\n",
+ header->backing_file, -err);
+ goto out_free;
+ }
+
+ header->mtime = htobe32(modtime);
+ header->size = htobe64(*size);
+ header->sectorsize = htobe32(sectorsize);
+ header->alignment = htobe32(alignment);
+ header->cow_format = COW_BITMAP;
+
+ err = cow_write_file(fd, header, sizeof(*header));
+ if (err != sizeof(*header)) {
+ cow_printf("write_cow_header - write of header to "
+ "new COW file '%s' failed, err = %d\n", cow_file,
+ -err);
+ goto out_free;
+ }
+ err = 0;
+ out_free:
+ cow_free(header);
+ out:
+ return err;
+}
+
+int file_reader(__u64 offset, char *buf, int len, void *arg)
+{
+ int fd = *((int *) arg);
+
+ return pread(fd, buf, len, offset);
+}
+
+/* XXX Need to sanity-check the values read from the header */
+
+int read_cow_header(int (*reader)(__u64, char *, int, void *), void *arg,
+ __u32 *version_out, char **backing_file_out,
+ time_t *mtime_out, unsigned long long *size_out,
+ int *sectorsize_out, __u32 *align_out,
+ int *bitmap_offset_out)
+{
+ union cow_header *header;
+ char *file;
+ int err, n;
+ unsigned long version, magic;
+
+ header = cow_malloc(sizeof(*header));
+ if (header == NULL) {
+ cow_printf("read_cow_header - Failed to allocate header\n");
+ return -ENOMEM;
+ }
+ err = -EINVAL;
+ n = (*reader)(0, (char *) header, sizeof(*header), arg);
+ if (n < offsetof(typeof(header->v1), backing_file)) {
+ cow_printf("read_cow_header - short header\n");
+ goto out;
+ }
+
+ magic = header->v1.magic;
+ if (magic == COW_MAGIC)
+ version = header->v1.version;
+ else if (magic == be32toh(COW_MAGIC))
+ version = be32toh(header->v1.version);
+ /* No error printed because the non-COW case comes through here */
+ else goto out;
+
+ *version_out = version;
+
+ if (version == 1) {
+ if (n < sizeof(header->v1)) {
+ cow_printf("read_cow_header - failed to read V1 "
+ "header\n");
+ goto out;
+ }
+ *mtime_out = header->v1.mtime;
+ *size_out = header->v1.size;
+ *sectorsize_out = header->v1.sectorsize;
+ *bitmap_offset_out = sizeof(header->v1);
+ *align_out = *sectorsize_out;
+ file = header->v1.backing_file;
+ }
+ else if (version == 2) {
+ if (n < sizeof(header->v2)) {
+ cow_printf("read_cow_header - failed to read V2 "
+ "header\n");
+ goto out;
+ }
+ *mtime_out = be32toh(header->v2.mtime);
+ *size_out = be64toh(header->v2.size);
+ *sectorsize_out = be32toh(header->v2.sectorsize);
+ *bitmap_offset_out = sizeof(header->v2);
+ *align_out = *sectorsize_out;
+ file = header->v2.backing_file;
+ }
+ /* This is very subtle - see above at union cow_header definition */
+ else if (version == 3 && (*((int*)header->v3.backing_file) != 0)) {
+ if (n < sizeof(header->v3)) {
+ cow_printf("read_cow_header - failed to read V3 "
+ "header\n");
+ goto out;
+ }
+ *mtime_out = be32toh(header->v3.mtime);
+ *size_out = be64toh(header->v3.size);
+ *sectorsize_out = be32toh(header->v3.sectorsize);
+ *align_out = be32toh(header->v3.alignment);
+ if (*align_out == 0) {
+ cow_printf("read_cow_header - invalid COW header, "
+ "align == 0\n");
+ }
+ *bitmap_offset_out = ROUND_UP(sizeof(header->v3), *align_out);
+ file = header->v3.backing_file;
+ }
+ else if (version == 3) {
+ cow_printf("read_cow_header - broken V3 file with"
+ " 64-bit layout - recovering content.\n");
+
+ if (n < sizeof(header->v3_b)) {
+ cow_printf("read_cow_header - failed to read V3 "
+ "header\n");
+ goto out;
+ }
+
+ /*
+ * this was used until Dec2005 - 64bits are needed to represent
+ * 2038+. I.e. we can safely do this truncating cast.
+ *
+ * Additionally, we must use be32toh() instead of be64toh(), since
+ * the program used to use the former (tested - I got mtime
+ * mismatch "0 vs whatever").
+ *
+ * Ever heard about bug-to-bug-compatibility ? ;-) */
+ *mtime_out = (time32_t) be32toh(header->v3_b.mtime);
+
+ *size_out = be64toh(header->v3_b.size);
+ *sectorsize_out = be32toh(header->v3_b.sectorsize);
+ *align_out = be32toh(header->v3_b.alignment);
+ if (*align_out == 0) {
+ cow_printf("read_cow_header - invalid COW header, "
+ "align == 0\n");
+ }
+ *bitmap_offset_out = ROUND_UP(sizeof(header->v3_b), *align_out);
+ file = header->v3_b.backing_file;
+ }
+ else {
+ cow_printf("read_cow_header - invalid COW version\n");
+ goto out;
+ }
+ err = -ENOMEM;
+ *backing_file_out = cow_strdup(file);
+ if (*backing_file_out == NULL) {
+ cow_printf("read_cow_header - failed to allocate backing "
+ "file\n");
+ goto out;
+ }
+ err = 0;
+ out:
+ cow_free(header);
+ return err;
+}
+
+int init_cow_file(int fd, char *cow_file, char *backing_file, int sectorsize,
+ int alignment, int *bitmap_offset_out,
+ unsigned long *bitmap_len_out, int *data_offset_out)
+{
+ unsigned long long size, offset;
+ char zero = 0;
+ int err;
+
+ err = write_cow_header(cow_file, fd, backing_file, sectorsize,
+ alignment, &size);
+ if (err)
+ goto out;
+
+ *bitmap_offset_out = ROUND_UP(sizeof(struct cow_header_v3), alignment);
+ cow_sizes(COW_VERSION, size, sectorsize, alignment, *bitmap_offset_out,
+ bitmap_len_out, data_offset_out);
+
+ offset = *data_offset_out + size - sizeof(zero);
+ err = cow_seek_file(fd, offset);
+ if (err < 0) {
+ cow_printf("cow bitmap lseek failed : err = %d\n", -err);
+ goto out;
+ }
+
+ /*
+ * does not really matter how much we write it is just to set EOF
+ * this also sets the entire COW bitmap
+ * to zero without having to allocate it
+ */
+ err = cow_write_file(fd, &zero, sizeof(zero));
+ if (err != sizeof(zero)) {
+ cow_printf("Write of bitmap to new COW file '%s' failed, "
+ "err = %d\n", cow_file, -err);
+ if (err >= 0)
+ err = -EINVAL;
+ goto out;
+ }
+
+ return 0;
+ out:
+ return err;
+}
diff --git a/arch/um/drivers/daemon.h b/arch/um/drivers/daemon.h
new file mode 100644
index 0000000..c2dd195
--- /dev/null
+++ b/arch/um/drivers/daemon.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __DAEMON_H__
+#define __DAEMON_H__
+
+#include <net_user.h>
+
+#define SWITCH_VERSION 3
+
+struct daemon_data {
+ char *sock_type;
+ char *ctl_sock;
+ void *ctl_addr;
+ void *data_addr;
+ void *local_addr;
+ int fd;
+ int control;
+ void *dev;
+};
+
+extern const struct net_user_info daemon_user_info;
+
+extern int daemon_user_write(int fd, void *buf, int len,
+ struct daemon_data *pri);
+
+#endif
diff --git a/arch/um/drivers/daemon_kern.c b/arch/um/drivers/daemon_kern.c
new file mode 100644
index 0000000..7568cc2
--- /dev/null
+++ b/arch/um/drivers/daemon_kern.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ * Licensed under the GPL.
+ */
+
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <net_kern.h>
+#include "daemon.h"
+
+struct daemon_init {
+ char *sock_type;
+ char *ctl_sock;
+};
+
+static void daemon_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *pri;
+ struct daemon_data *dpri;
+ struct daemon_init *init = data;
+
+ pri = netdev_priv(dev);
+ dpri = (struct daemon_data *) pri->user;
+ dpri->sock_type = init->sock_type;
+ dpri->ctl_sock = init->ctl_sock;
+ dpri->fd = -1;
+ dpri->control = -1;
+ dpri->dev = dev;
+ /* We will free this pointer. If it contains crap we're burned. */
+ dpri->ctl_addr = NULL;
+ dpri->data_addr = NULL;
+ dpri->local_addr = NULL;
+
+ printk("daemon backend (uml_switch version %d) - %s:%s",
+ SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock);
+ printk("\n");
+}
+
+static int daemon_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return net_recvfrom(fd, skb_mac_header(skb),
+ skb->dev->mtu + ETH_HEADER_OTHER);
+}
+
+static int daemon_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return daemon_user_write(fd, skb->data, skb->len,
+ (struct daemon_data *) &lp->user);
+}
+
+static const struct net_kern_info daemon_kern_info = {
+ .init = daemon_init,
+ .protocol = eth_protocol,
+ .read = daemon_read,
+ .write = daemon_write,
+};
+
+static int daemon_setup(char *str, char **mac_out, void *data)
+{
+ struct daemon_init *init = data;
+ char *remain;
+
+ *init = ((struct daemon_init)
+ { .sock_type = "unix",
+ .ctl_sock = "/tmp/uml.ctl" });
+
+ remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,
+ NULL);
+ if (remain != NULL)
+ printk(KERN_WARNING "daemon_setup : Ignoring data socket "
+ "specification\n");
+
+ return 1;
+}
+
+static struct transport daemon_transport = {
+ .list = LIST_HEAD_INIT(daemon_transport.list),
+ .name = "daemon",
+ .setup = daemon_setup,
+ .user = &daemon_user_info,
+ .kern = &daemon_kern_info,
+ .private_size = sizeof(struct daemon_data),
+ .setup_size = sizeof(struct daemon_init),
+};
+
+static int register_daemon(void)
+{
+ register_transport(&daemon_transport);
+ return 0;
+}
+
+late_initcall(register_daemon);
diff --git a/arch/um/drivers/daemon_user.c b/arch/um/drivers/daemon_user.c
new file mode 100644
index 0000000..8813c10
--- /dev/null
+++ b/arch/um/drivers/daemon_user.c
@@ -0,0 +1,193 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ * Licensed under the GPL.
+ */
+
+#include <stdint.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/un.h>
+#include "daemon.h"
+#include <net_user.h>
+#include <os.h>
+#include <um_malloc.h>
+
+enum request_type { REQ_NEW_CONTROL };
+
+#define SWITCH_MAGIC 0xfeedface
+
+struct request_v3 {
+ uint32_t magic;
+ uint32_t version;
+ enum request_type type;
+ struct sockaddr_un sock;
+};
+
+static struct sockaddr_un *new_addr(void *name, int len)
+{
+ struct sockaddr_un *sun;
+
+ sun = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL);
+ if (sun == NULL) {
+ printk(UM_KERN_ERR "new_addr: allocation of sockaddr_un "
+ "failed\n");
+ return NULL;
+ }
+ sun->sun_family = AF_UNIX;
+ memcpy(sun->sun_path, name, len);
+ return sun;
+}
+
+static int connect_to_switch(struct daemon_data *pri)
+{
+ struct sockaddr_un *ctl_addr = pri->ctl_addr;
+ struct sockaddr_un *local_addr = pri->local_addr;
+ struct sockaddr_un *sun;
+ struct request_v3 req;
+ int fd, n, err;
+
+ pri->control = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (pri->control < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "daemon_open : control socket failed, "
+ "errno = %d\n", -err);
+ return err;
+ }
+
+ if (connect(pri->control, (struct sockaddr *) ctl_addr,
+ sizeof(*ctl_addr)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "daemon_open : control connect failed, "
+ "errno = %d\n", -err);
+ goto out;
+ }
+
+ fd = socket(AF_UNIX, SOCK_DGRAM, 0);
+ if (fd < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "daemon_open : data socket failed, "
+ "errno = %d\n", -err);
+ goto out;
+ }
+ if (bind(fd, (struct sockaddr *) local_addr, sizeof(*local_addr)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "daemon_open : data bind failed, "
+ "errno = %d\n", -err);
+ goto out_close;
+ }
+
+ sun = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL);
+ if (sun == NULL) {
+ printk(UM_KERN_ERR "new_addr: allocation of sockaddr_un "
+ "failed\n");
+ err = -ENOMEM;
+ goto out_close;
+ }
+
+ req.magic = SWITCH_MAGIC;
+ req.version = SWITCH_VERSION;
+ req.type = REQ_NEW_CONTROL;
+ req.sock = *local_addr;
+ n = write(pri->control, &req, sizeof(req));
+ if (n != sizeof(req)) {
+ printk(UM_KERN_ERR "daemon_open : control setup request "
+ "failed, err = %d\n", -errno);
+ err = -ENOTCONN;
+ goto out_free;
+ }
+
+ n = read(pri->control, sun, sizeof(*sun));
+ if (n != sizeof(*sun)) {
+ printk(UM_KERN_ERR "daemon_open : read of data socket failed, "
+ "err = %d\n", -errno);
+ err = -ENOTCONN;
+ goto out_free;
+ }
+
+ pri->data_addr = sun;
+ return fd;
+
+ out_free:
+ kfree(sun);
+ out_close:
+ close(fd);
+ out:
+ close(pri->control);
+ return err;
+}
+
+static int daemon_user_init(void *data, void *dev)
+{
+ struct daemon_data *pri = data;
+ struct timeval tv;
+ struct {
+ char zero;
+ int pid;
+ int usecs;
+ } name;
+
+ if (!strcmp(pri->sock_type, "unix"))
+ pri->ctl_addr = new_addr(pri->ctl_sock,
+ strlen(pri->ctl_sock) + 1);
+ name.zero = 0;
+ name.pid = os_getpid();
+ gettimeofday(&tv, NULL);
+ name.usecs = tv.tv_usec;
+ pri->local_addr = new_addr(&name, sizeof(name));
+ pri->dev = dev;
+ pri->fd = connect_to_switch(pri);
+ if (pri->fd < 0) {
+ kfree(pri->local_addr);
+ pri->local_addr = NULL;
+ return pri->fd;
+ }
+
+ return 0;
+}
+
+static int daemon_open(void *data)
+{
+ struct daemon_data *pri = data;
+ return pri->fd;
+}
+
+static void daemon_remove(void *data)
+{
+ struct daemon_data *pri = data;
+
+ close(pri->fd);
+ pri->fd = -1;
+ close(pri->control);
+ pri->control = -1;
+
+ kfree(pri->data_addr);
+ pri->data_addr = NULL;
+ kfree(pri->ctl_addr);
+ pri->ctl_addr = NULL;
+ kfree(pri->local_addr);
+ pri->local_addr = NULL;
+}
+
+int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri)
+{
+ struct sockaddr_un *data_addr = pri->data_addr;
+
+ return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
+}
+
+const struct net_user_info daemon_user_info = {
+ .init = daemon_user_init,
+ .open = daemon_open,
+ .close = NULL,
+ .remove = daemon_remove,
+ .add_address = NULL,
+ .delete_address = NULL,
+ .mtu = ETH_MAX_PACKET,
+ .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
+};
diff --git a/arch/um/drivers/fd.c b/arch/um/drivers/fd.c
new file mode 100644
index 0000000..a13a427
--- /dev/null
+++ b/arch/um/drivers/fd.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <termios.h>
+#include "chan_user.h"
+#include <os.h>
+#include <um_malloc.h>
+
+struct fd_chan {
+ int fd;
+ int raw;
+ struct termios tt;
+ char str[sizeof("1234567890\0")];
+};
+
+static void *fd_init(char *str, int device, const struct chan_opts *opts)
+{
+ struct fd_chan *data;
+ char *end;
+ int n;
+
+ if (*str != ':') {
+ printk(UM_KERN_ERR "fd_init : channel type 'fd' must specify a "
+ "file descriptor\n");
+ return NULL;
+ }
+ str++;
+ n = strtoul(str, &end, 0);
+ if ((*end != '\0') || (end == str)) {
+ printk(UM_KERN_ERR "fd_init : couldn't parse file descriptor "
+ "'%s'\n", str);
+ return NULL;
+ }
+
+ data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
+ if (data == NULL)
+ return NULL;
+
+ *data = ((struct fd_chan) { .fd = n,
+ .raw = opts->raw });
+ return data;
+}
+
+static int fd_open(int input, int output, int primary, void *d, char **dev_out)
+{
+ struct fd_chan *data = d;
+ int err;
+
+ if (data->raw && isatty(data->fd)) {
+ CATCH_EINTR(err = tcgetattr(data->fd, &data->tt));
+ if (err)
+ return err;
+
+ err = raw(data->fd);
+ if (err)
+ return err;
+ }
+ sprintf(data->str, "%d", data->fd);
+ *dev_out = data->str;
+ return data->fd;
+}
+
+static void fd_close(int fd, void *d)
+{
+ struct fd_chan *data = d;
+ int err;
+
+ if (!data->raw || !isatty(fd))
+ return;
+
+ CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &data->tt));
+ if (err)
+ printk(UM_KERN_ERR "Failed to restore terminal state - "
+ "errno = %d\n", -err);
+ data->raw = 0;
+}
+
+const struct chan_ops fd_ops = {
+ .type = "fd",
+ .init = fd_init,
+ .open = fd_open,
+ .close = fd_close,
+ .read = generic_read,
+ .write = generic_write,
+ .console_write = generic_console_write,
+ .window_size = generic_window_size,
+ .free = generic_free,
+ .winch = 1,
+};
diff --git a/arch/um/drivers/harddog_kern.c b/arch/um/drivers/harddog_kern.c
new file mode 100644
index 0000000..6d38127
--- /dev/null
+++ b/arch/um/drivers/harddog_kern.c
@@ -0,0 +1,178 @@
+/* UML hardware watchdog, shamelessly stolen from:
+ *
+ * SoftDog 0.05: A Software Watchdog Device
+ *
+ * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
+ * http://www.redhat.com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
+ * warranty for any of this software. This material is provided
+ * "AS-IS" and at no charge.
+ *
+ * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *
+ * Software only watchdog driver. Unlike its big brother the WDT501P
+ * driver this won't always recover a failed machine.
+ *
+ * 03/96: Angelo Haritsis <ah@doc.ic.ac.uk> :
+ * Modularised.
+ * Added soft_margin; use upon insmod to change the timer delay.
+ * NB: uses same minor as wdt (WATCHDOG_MINOR); we could use separate
+ * minors.
+ *
+ * 19980911 Alan Cox
+ * Made SMP safe for 2.3.x
+ *
+ * 20011127 Joel Becker (jlbec@evilplan.org>
+ * Added soft_noboot; Allows testing the softdog trigger without
+ * requiring a recompile.
+ * Added WDIOC_GETTIMEOUT and WDIOC_SETTIMOUT.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/reboot.h>
+#include <linux/mutex.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+#include "mconsole.h"
+
+MODULE_LICENSE("GPL");
+
+static DEFINE_MUTEX(harddog_mutex);
+static DEFINE_SPINLOCK(lock);
+static int timer_alive;
+static int harddog_in_fd = -1;
+static int harddog_out_fd = -1;
+
+/*
+ * Allow only one person to hold it open
+ */
+
+extern int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock);
+
+static int harddog_open(struct inode *inode, struct file *file)
+{
+ int err = -EBUSY;
+ char *sock = NULL;
+
+ mutex_lock(&harddog_mutex);
+ spin_lock(&lock);
+ if(timer_alive)
+ goto err;
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+ __module_get(THIS_MODULE);
+#endif
+
+#ifdef CONFIG_MCONSOLE
+ sock = mconsole_notify_socket();
+#endif
+ err = start_watchdog(&harddog_in_fd, &harddog_out_fd, sock);
+ if(err)
+ goto err;
+
+ timer_alive = 1;
+ spin_unlock(&lock);
+ mutex_unlock(&harddog_mutex);
+ return nonseekable_open(inode, file);
+err:
+ spin_unlock(&lock);
+ mutex_unlock(&harddog_mutex);
+ return err;
+}
+
+extern void stop_watchdog(int in_fd, int out_fd);
+
+static int harddog_release(struct inode *inode, struct file *file)
+{
+ /*
+ * Shut off the timer.
+ */
+
+ spin_lock(&lock);
+
+ stop_watchdog(harddog_in_fd, harddog_out_fd);
+ harddog_in_fd = -1;
+ harddog_out_fd = -1;
+
+ timer_alive=0;
+ spin_unlock(&lock);
+
+ return 0;
+}
+
+extern int ping_watchdog(int fd);
+
+static ssize_t harddog_write(struct file *file, const char __user *data, size_t len,
+ loff_t *ppos)
+{
+ /*
+ * Refresh the timer.
+ */
+ if(len)
+ return ping_watchdog(harddog_out_fd);
+ return 0;
+}
+
+static int harddog_ioctl_unlocked(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ void __user *argp= (void __user *)arg;
+ static struct watchdog_info ident = {
+ WDIOC_SETTIMEOUT,
+ 0,
+ "UML Hardware Watchdog"
+ };
+ switch (cmd) {
+ default:
+ return -ENOTTY;
+ case WDIOC_GETSUPPORT:
+ if(copy_to_user(argp, &ident, sizeof(ident)))
+ return -EFAULT;
+ return 0;
+ case WDIOC_GETSTATUS:
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(0,(int __user *)argp);
+ case WDIOC_KEEPALIVE:
+ return ping_watchdog(harddog_out_fd);
+ }
+}
+
+static long harddog_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ long ret;
+
+ mutex_lock(&harddog_mutex);
+ ret = harddog_ioctl_unlocked(file, cmd, arg);
+ mutex_unlock(&harddog_mutex);
+
+ return ret;
+}
+
+static const struct file_operations harddog_fops = {
+ .owner = THIS_MODULE,
+ .write = harddog_write,
+ .unlocked_ioctl = harddog_ioctl,
+ .open = harddog_open,
+ .release = harddog_release,
+ .llseek = no_llseek,
+};
+
+static struct miscdevice harddog_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &harddog_fops,
+};
+module_misc_device(harddog_miscdev);
diff --git a/arch/um/drivers/harddog_user.c b/arch/um/drivers/harddog_user.c
new file mode 100644
index 0000000..3aa8b0d
--- /dev/null
+++ b/arch/um/drivers/harddog_user.c
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <os.h>
+
+struct dog_data {
+ int stdin_fd;
+ int stdout_fd;
+ int close_me[2];
+};
+
+static void pre_exec(void *d)
+{
+ struct dog_data *data = d;
+
+ dup2(data->stdin_fd, 0);
+ dup2(data->stdout_fd, 1);
+ dup2(data->stdout_fd, 2);
+ close(data->stdin_fd);
+ close(data->stdout_fd);
+ close(data->close_me[0]);
+ close(data->close_me[1]);
+}
+
+int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock)
+{
+ struct dog_data data;
+ int in_fds[2], out_fds[2], pid, n, err;
+ char pid_buf[sizeof("nnnnnnn\0")], c;
+ char *pid_args[] = { "/usr/bin/uml_watchdog", "-pid", pid_buf, NULL };
+ char *mconsole_args[] = { "/usr/bin/uml_watchdog", "-mconsole", NULL,
+ NULL };
+ char **args = NULL;
+
+ err = os_pipe(in_fds, 1, 0);
+ if (err < 0) {
+ printk("harddog_open - os_pipe failed, err = %d\n", -err);
+ goto out;
+ }
+
+ err = os_pipe(out_fds, 1, 0);
+ if (err < 0) {
+ printk("harddog_open - os_pipe failed, err = %d\n", -err);
+ goto out_close_in;
+ }
+
+ data.stdin_fd = out_fds[0];
+ data.stdout_fd = in_fds[1];
+ data.close_me[0] = out_fds[1];
+ data.close_me[1] = in_fds[0];
+
+ if (sock != NULL) {
+ mconsole_args[2] = sock;
+ args = mconsole_args;
+ }
+ else {
+ /* XXX The os_getpid() is not SMP correct */
+ sprintf(pid_buf, "%d", os_getpid());
+ args = pid_args;
+ }
+
+ pid = run_helper(pre_exec, &data, args);
+
+ close(out_fds[0]);
+ close(in_fds[1]);
+
+ if (pid < 0) {
+ err = -pid;
+ printk("harddog_open - run_helper failed, errno = %d\n", -err);
+ goto out_close_out;
+ }
+
+ n = read(in_fds[0], &c, sizeof(c));
+ if (n == 0) {
+ printk("harddog_open - EOF on watchdog pipe\n");
+ helper_wait(pid);
+ err = -EIO;
+ goto out_close_out;
+ }
+ else if (n < 0) {
+ printk("harddog_open - read of watchdog pipe failed, "
+ "err = %d\n", errno);
+ helper_wait(pid);
+ err = n;
+ goto out_close_out;
+ }
+ *in_fd_ret = in_fds[0];
+ *out_fd_ret = out_fds[1];
+ return 0;
+
+ out_close_in:
+ close(in_fds[0]);
+ close(in_fds[1]);
+ out_close_out:
+ close(out_fds[0]);
+ close(out_fds[1]);
+ out:
+ return err;
+}
+
+void stop_watchdog(int in_fd, int out_fd)
+{
+ close(in_fd);
+ close(out_fd);
+}
+
+int ping_watchdog(int fd)
+{
+ int n;
+ char c = '\n';
+
+ n = write(fd, &c, sizeof(c));
+ if (n != sizeof(c)) {
+ printk("ping_watchdog - write failed, ret = %d, err = %d\n",
+ n, errno);
+ if (n < 0)
+ return n;
+ return -EIO;
+ }
+ return 1;
+
+}
diff --git a/arch/um/drivers/hostaudio_kern.c b/arch/um/drivers/hostaudio_kern.c
new file mode 100644
index 0000000..7f9dbdb
--- /dev/null
+++ b/arch/um/drivers/hostaudio_kern.c
@@ -0,0 +1,354 @@
+/*
+ * Copyright (C) 2002 Steve Schmidtke
+ * Licensed under the GPL
+ */
+
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/sound.h>
+#include <linux/soundcard.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.h>
+#include <init.h>
+#include <os.h>
+
+struct hostaudio_state {
+ int fd;
+};
+
+struct hostmixer_state {
+ int fd;
+};
+
+#define HOSTAUDIO_DEV_DSP "/dev/sound/dsp"
+#define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer"
+
+/*
+ * Changed either at boot time or module load time. At boot, this is
+ * single-threaded; at module load, multiple modules would each have
+ * their own copy of these variables.
+ */
+static char *dsp = HOSTAUDIO_DEV_DSP;
+static char *mixer = HOSTAUDIO_DEV_MIXER;
+
+#define DSP_HELP \
+" This is used to specify the host dsp device to the hostaudio driver.\n" \
+" The default is \"" HOSTAUDIO_DEV_DSP "\".\n\n"
+
+#define MIXER_HELP \
+" This is used to specify the host mixer device to the hostaudio driver.\n"\
+" The default is \"" HOSTAUDIO_DEV_MIXER "\".\n\n"
+
+module_param(dsp, charp, 0644);
+MODULE_PARM_DESC(dsp, DSP_HELP);
+module_param(mixer, charp, 0644);
+MODULE_PARM_DESC(mixer, MIXER_HELP);
+
+#ifndef MODULE
+static int set_dsp(char *name, int *add)
+{
+ dsp = name;
+ return 0;
+}
+
+__uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP);
+
+static int set_mixer(char *name, int *add)
+{
+ mixer = name;
+ return 0;
+}
+
+__uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP);
+#endif
+
+static DEFINE_MUTEX(hostaudio_mutex);
+
+/* /dev/dsp file operations */
+
+static ssize_t hostaudio_read(struct file *file, char __user *buffer,
+ size_t count, loff_t *ppos)
+{
+ struct hostaudio_state *state = file->private_data;
+ void *kbuf;
+ int err;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostaudio: read called, count = %d\n", count);
+#endif
+
+ kbuf = kmalloc(count, GFP_KERNEL);
+ if (kbuf == NULL)
+ return -ENOMEM;
+
+ err = os_read_file(state->fd, kbuf, count);
+ if (err < 0)
+ goto out;
+
+ if (copy_to_user(buffer, kbuf, err))
+ err = -EFAULT;
+
+out:
+ kfree(kbuf);
+ return err;
+}
+
+static ssize_t hostaudio_write(struct file *file, const char __user *buffer,
+ size_t count, loff_t *ppos)
+{
+ struct hostaudio_state *state = file->private_data;
+ void *kbuf;
+ int err;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostaudio: write called, count = %d\n", count);
+#endif
+
+ kbuf = memdup_user(buffer, count);
+ if (IS_ERR(kbuf))
+ return PTR_ERR(kbuf);
+
+ err = os_write_file(state->fd, kbuf, count);
+ if (err < 0)
+ goto out;
+ *ppos += err;
+
+ out:
+ kfree(kbuf);
+ return err;
+}
+
+static __poll_t hostaudio_poll(struct file *file,
+ struct poll_table_struct *wait)
+{
+ __poll_t mask = 0;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostaudio: poll called (unimplemented)\n");
+#endif
+
+ return mask;
+}
+
+static long hostaudio_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct hostaudio_state *state = file->private_data;
+ unsigned long data = 0;
+ int err;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostaudio: ioctl called, cmd = %u\n", cmd);
+#endif
+ switch(cmd){
+ case SNDCTL_DSP_SPEED:
+ case SNDCTL_DSP_STEREO:
+ case SNDCTL_DSP_GETBLKSIZE:
+ case SNDCTL_DSP_CHANNELS:
+ case SNDCTL_DSP_SUBDIVIDE:
+ case SNDCTL_DSP_SETFRAGMENT:
+ if (get_user(data, (int __user *) arg))
+ return -EFAULT;
+ break;
+ default:
+ break;
+ }
+
+ err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data);
+
+ switch(cmd){
+ case SNDCTL_DSP_SPEED:
+ case SNDCTL_DSP_STEREO:
+ case SNDCTL_DSP_GETBLKSIZE:
+ case SNDCTL_DSP_CHANNELS:
+ case SNDCTL_DSP_SUBDIVIDE:
+ case SNDCTL_DSP_SETFRAGMENT:
+ if (put_user(data, (int __user *) arg))
+ return -EFAULT;
+ break;
+ default:
+ break;
+ }
+
+ return err;
+}
+
+static int hostaudio_open(struct inode *inode, struct file *file)
+{
+ struct hostaudio_state *state;
+ int r = 0, w = 0;
+ int ret;
+
+#ifdef DEBUG
+ kernel_param_lock(THIS_MODULE);
+ printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp);
+ kernel_param_unlock(THIS_MODULE);
+#endif
+
+ state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL);
+ if (state == NULL)
+ return -ENOMEM;
+
+ if (file->f_mode & FMODE_READ)
+ r = 1;
+ if (file->f_mode & FMODE_WRITE)
+ w = 1;
+
+ kernel_param_lock(THIS_MODULE);
+ mutex_lock(&hostaudio_mutex);
+ ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
+ mutex_unlock(&hostaudio_mutex);
+ kernel_param_unlock(THIS_MODULE);
+
+ if (ret < 0) {
+ kfree(state);
+ return ret;
+ }
+ state->fd = ret;
+ file->private_data = state;
+ return 0;
+}
+
+static int hostaudio_release(struct inode *inode, struct file *file)
+{
+ struct hostaudio_state *state = file->private_data;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostaudio: release called\n");
+#endif
+ os_close_file(state->fd);
+ kfree(state);
+
+ return 0;
+}
+
+/* /dev/mixer file operations */
+
+static long hostmixer_ioctl_mixdev(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct hostmixer_state *state = file->private_data;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostmixer: ioctl called\n");
+#endif
+
+ return os_ioctl_generic(state->fd, cmd, arg);
+}
+
+static int hostmixer_open_mixdev(struct inode *inode, struct file *file)
+{
+ struct hostmixer_state *state;
+ int r = 0, w = 0;
+ int ret;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostmixer: open called (host: %s)\n", mixer);
+#endif
+
+ state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL);
+ if (state == NULL)
+ return -ENOMEM;
+
+ if (file->f_mode & FMODE_READ)
+ r = 1;
+ if (file->f_mode & FMODE_WRITE)
+ w = 1;
+
+ kernel_param_lock(THIS_MODULE);
+ mutex_lock(&hostaudio_mutex);
+ ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
+ mutex_unlock(&hostaudio_mutex);
+ kernel_param_unlock(THIS_MODULE);
+
+ if (ret < 0) {
+ kernel_param_lock(THIS_MODULE);
+ printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', "
+ "err = %d\n", dsp, -ret);
+ kernel_param_unlock(THIS_MODULE);
+ kfree(state);
+ return ret;
+ }
+
+ file->private_data = state;
+ return 0;
+}
+
+static int hostmixer_release(struct inode *inode, struct file *file)
+{
+ struct hostmixer_state *state = file->private_data;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostmixer: release called\n");
+#endif
+
+ os_close_file(state->fd);
+ kfree(state);
+
+ return 0;
+}
+
+/* kernel module operations */
+
+static const struct file_operations hostaudio_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .read = hostaudio_read,
+ .write = hostaudio_write,
+ .poll = hostaudio_poll,
+ .unlocked_ioctl = hostaudio_ioctl,
+ .mmap = NULL,
+ .open = hostaudio_open,
+ .release = hostaudio_release,
+};
+
+static const struct file_operations hostmixer_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .unlocked_ioctl = hostmixer_ioctl_mixdev,
+ .open = hostmixer_open_mixdev,
+ .release = hostmixer_release,
+};
+
+struct {
+ int dev_audio;
+ int dev_mixer;
+} module_data;
+
+MODULE_AUTHOR("Steve Schmidtke");
+MODULE_DESCRIPTION("UML Audio Relay");
+MODULE_LICENSE("GPL");
+
+static int __init hostaudio_init_module(void)
+{
+ kernel_param_lock(THIS_MODULE);
+ printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
+ dsp, mixer);
+ kernel_param_unlock(THIS_MODULE);
+
+ module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1);
+ if (module_data.dev_audio < 0) {
+ printk(KERN_ERR "hostaudio: couldn't register DSP device!\n");
+ return -ENODEV;
+ }
+
+ module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1);
+ if (module_data.dev_mixer < 0) {
+ printk(KERN_ERR "hostmixer: couldn't register mixer "
+ "device!\n");
+ unregister_sound_dsp(module_data.dev_audio);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void __exit hostaudio_cleanup_module (void)
+{
+ unregister_sound_mixer(module_data.dev_mixer);
+ unregister_sound_dsp(module_data.dev_audio);
+}
+
+module_init(hostaudio_init_module);
+module_exit(hostaudio_cleanup_module);
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
new file mode 100644
index 0000000..8d80b27
--- /dev/null
+++ b/arch/um/drivers/line.c
@@ -0,0 +1,769 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/irqreturn.h>
+#include <linux/kd.h>
+#include <linux/sched/signal.h>
+#include <linux/slab.h>
+
+#include "chan.h"
+#include <irq_kern.h>
+#include <irq_user.h>
+#include <kern_util.h>
+#include <os.h>
+
+#define LINE_BUFSIZE 4096
+
+static irqreturn_t line_interrupt(int irq, void *data)
+{
+ struct chan *chan = data;
+ struct line *line = chan->line;
+
+ if (line)
+ chan_interrupt(line, irq);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * Returns the free space inside the ring buffer of this line.
+ *
+ * Should be called while holding line->lock (this does not modify data).
+ */
+static int write_room(struct line *line)
+{
+ int n;
+
+ if (line->buffer == NULL)
+ return LINE_BUFSIZE - 1;
+
+ /* This is for the case where the buffer is wrapped! */
+ n = line->head - line->tail;
+
+ if (n <= 0)
+ n += LINE_BUFSIZE; /* The other case */
+ return n - 1;
+}
+
+int line_write_room(struct tty_struct *tty)
+{
+ struct line *line = tty->driver_data;
+ unsigned long flags;
+ int room;
+
+ spin_lock_irqsave(&line->lock, flags);
+ room = write_room(line);
+ spin_unlock_irqrestore(&line->lock, flags);
+
+ return room;
+}
+
+int line_chars_in_buffer(struct tty_struct *tty)
+{
+ struct line *line = tty->driver_data;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&line->lock, flags);
+ /* write_room subtracts 1 for the needed NULL, so we readd it.*/
+ ret = LINE_BUFSIZE - (write_room(line) + 1);
+ spin_unlock_irqrestore(&line->lock, flags);
+
+ return ret;
+}
+
+/*
+ * This copies the content of buf into the circular buffer associated with
+ * this line.
+ * The return value is the number of characters actually copied, i.e. the ones
+ * for which there was space: this function is not supposed to ever flush out
+ * the circular buffer.
+ *
+ * Must be called while holding line->lock!
+ */
+static int buffer_data(struct line *line, const char *buf, int len)
+{
+ int end, room;
+
+ if (line->buffer == NULL) {
+ line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC);
+ if (line->buffer == NULL) {
+ printk(KERN_ERR "buffer_data - atomic allocation "
+ "failed\n");
+ return 0;
+ }
+ line->head = line->buffer;
+ line->tail = line->buffer;
+ }
+
+ room = write_room(line);
+ len = (len > room) ? room : len;
+
+ end = line->buffer + LINE_BUFSIZE - line->tail;
+
+ if (len < end) {
+ memcpy(line->tail, buf, len);
+ line->tail += len;
+ }
+ else {
+ /* The circular buffer is wrapping */
+ memcpy(line->tail, buf, end);
+ buf += end;
+ memcpy(line->buffer, buf, len - end);
+ line->tail = line->buffer + len - end;
+ }
+
+ return len;
+}
+
+/*
+ * Flushes the ring buffer to the output channels. That is, write_chan is
+ * called, passing it line->head as buffer, and an appropriate count.
+ *
+ * On exit, returns 1 when the buffer is empty,
+ * 0 when the buffer is not empty on exit,
+ * and -errno when an error occurred.
+ *
+ * Must be called while holding line->lock!*/
+static int flush_buffer(struct line *line)
+{
+ int n, count;
+
+ if ((line->buffer == NULL) || (line->head == line->tail))
+ return 1;
+
+ if (line->tail < line->head) {
+ /* line->buffer + LINE_BUFSIZE is the end of the buffer! */
+ count = line->buffer + LINE_BUFSIZE - line->head;
+
+ n = write_chan(line->chan_out, line->head, count,
+ line->driver->write_irq);
+ if (n < 0)
+ return n;
+ if (n == count) {
+ /*
+ * We have flushed from ->head to buffer end, now we
+ * must flush only from the beginning to ->tail.
+ */
+ line->head = line->buffer;
+ } else {
+ line->head += n;
+ return 0;
+ }
+ }
+
+ count = line->tail - line->head;
+ n = write_chan(line->chan_out, line->head, count,
+ line->driver->write_irq);
+
+ if (n < 0)
+ return n;
+
+ line->head += n;
+ return line->head == line->tail;
+}
+
+void line_flush_buffer(struct tty_struct *tty)
+{
+ struct line *line = tty->driver_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&line->lock, flags);
+ flush_buffer(line);
+ spin_unlock_irqrestore(&line->lock, flags);
+}
+
+/*
+ * We map both ->flush_chars and ->put_char (which go in pair) onto
+ * ->flush_buffer and ->write. Hope it's not that bad.
+ */
+void line_flush_chars(struct tty_struct *tty)
+{
+ line_flush_buffer(tty);
+}
+
+int line_put_char(struct tty_struct *tty, unsigned char ch)
+{
+ return line_write(tty, &ch, sizeof(ch));
+}
+
+int line_write(struct tty_struct *tty, const unsigned char *buf, int len)
+{
+ struct line *line = tty->driver_data;
+ unsigned long flags;
+ int n, ret = 0;
+
+ spin_lock_irqsave(&line->lock, flags);
+ if (line->head != line->tail)
+ ret = buffer_data(line, buf, len);
+ else {
+ n = write_chan(line->chan_out, buf, len,
+ line->driver->write_irq);
+ if (n < 0) {
+ ret = n;
+ goto out_up;
+ }
+
+ len -= n;
+ ret += n;
+ if (len > 0)
+ ret += buffer_data(line, buf + n, len);
+ }
+out_up:
+ spin_unlock_irqrestore(&line->lock, flags);
+ return ret;
+}
+
+void line_set_termios(struct tty_struct *tty, struct ktermios * old)
+{
+ /* nothing */
+}
+
+void line_throttle(struct tty_struct *tty)
+{
+ struct line *line = tty->driver_data;
+
+ deactivate_chan(line->chan_in, line->driver->read_irq);
+ line->throttled = 1;
+}
+
+void line_unthrottle(struct tty_struct *tty)
+{
+ struct line *line = tty->driver_data;
+
+ line->throttled = 0;
+ chan_interrupt(line, line->driver->read_irq);
+
+ /*
+ * Maybe there is enough stuff pending that calling the interrupt
+ * throttles us again. In this case, line->throttled will be 1
+ * again and we shouldn't turn the interrupt back on.
+ */
+ if (!line->throttled)
+ reactivate_chan(line->chan_in, line->driver->read_irq);
+}
+
+static irqreturn_t line_write_interrupt(int irq, void *data)
+{
+ struct chan *chan = data;
+ struct line *line = chan->line;
+ int err;
+
+ /*
+ * Interrupts are disabled here because genirq keep irqs disabled when
+ * calling the action handler.
+ */
+
+ spin_lock(&line->lock);
+ err = flush_buffer(line);
+ if (err == 0) {
+ spin_unlock(&line->lock);
+ return IRQ_NONE;
+ } else if (err < 0) {
+ line->head = line->buffer;
+ line->tail = line->buffer;
+ }
+ spin_unlock(&line->lock);
+
+ tty_port_tty_wakeup(&line->port);
+
+ return IRQ_HANDLED;
+}
+
+int line_setup_irq(int fd, int input, int output, struct line *line, void *data)
+{
+ const struct line_driver *driver = line->driver;
+ int err = 0;
+
+ if (input)
+ err = um_request_irq(driver->read_irq, fd, IRQ_READ,
+ line_interrupt, IRQF_SHARED,
+ driver->read_irq_name, data);
+ if (err)
+ return err;
+ if (output)
+ err = um_request_irq(driver->write_irq, fd, IRQ_NONE,
+ line_write_interrupt, IRQF_SHARED,
+ driver->write_irq_name, data);
+ return err;
+}
+
+static int line_activate(struct tty_port *port, struct tty_struct *tty)
+{
+ int ret;
+ struct line *line = tty->driver_data;
+
+ ret = enable_chan(line);
+ if (ret)
+ return ret;
+
+ if (!line->sigio) {
+ chan_enable_winch(line->chan_out, port);
+ line->sigio = 1;
+ }
+
+ chan_window_size(line, &tty->winsize.ws_row,
+ &tty->winsize.ws_col);
+
+ return 0;
+}
+
+static void unregister_winch(struct tty_struct *tty);
+
+static void line_destruct(struct tty_port *port)
+{
+ struct tty_struct *tty = tty_port_tty_get(port);
+ struct line *line = tty->driver_data;
+
+ if (line->sigio) {
+ unregister_winch(tty);
+ line->sigio = 0;
+ }
+}
+
+static const struct tty_port_operations line_port_ops = {
+ .activate = line_activate,
+ .destruct = line_destruct,
+};
+
+int line_open(struct tty_struct *tty, struct file *filp)
+{
+ struct line *line = tty->driver_data;
+
+ return tty_port_open(&line->port, tty, filp);
+}
+
+int line_install(struct tty_driver *driver, struct tty_struct *tty,
+ struct line *line)
+{
+ int ret;
+
+ ret = tty_standard_install(driver, tty);
+ if (ret)
+ return ret;
+
+ tty->driver_data = line;
+
+ return 0;
+}
+
+void line_close(struct tty_struct *tty, struct file * filp)
+{
+ struct line *line = tty->driver_data;
+
+ tty_port_close(&line->port, tty, filp);
+}
+
+void line_hangup(struct tty_struct *tty)
+{
+ struct line *line = tty->driver_data;
+
+ tty_port_hangup(&line->port);
+}
+
+void close_lines(struct line *lines, int nlines)
+{
+ int i;
+
+ for(i = 0; i < nlines; i++)
+ close_chan(&lines[i]);
+}
+
+int setup_one_line(struct line *lines, int n, char *init,
+ const struct chan_opts *opts, char **error_out)
+{
+ struct line *line = &lines[n];
+ struct tty_driver *driver = line->driver->driver;
+ int err = -EINVAL;
+
+ if (line->port.count) {
+ *error_out = "Device is already open";
+ goto out;
+ }
+
+ if (!strcmp(init, "none")) {
+ if (line->valid) {
+ line->valid = 0;
+ kfree(line->init_str);
+ tty_unregister_device(driver, n);
+ parse_chan_pair(NULL, line, n, opts, error_out);
+ err = 0;
+ }
+ } else {
+ char *new = kstrdup(init, GFP_KERNEL);
+ if (!new) {
+ *error_out = "Failed to allocate memory";
+ return -ENOMEM;
+ }
+ if (line->valid) {
+ tty_unregister_device(driver, n);
+ kfree(line->init_str);
+ }
+ line->init_str = new;
+ line->valid = 1;
+ err = parse_chan_pair(new, line, n, opts, error_out);
+ if (!err) {
+ struct device *d = tty_port_register_device(&line->port,
+ driver, n, NULL);
+ if (IS_ERR(d)) {
+ *error_out = "Failed to register device";
+ err = PTR_ERR(d);
+ parse_chan_pair(NULL, line, n, opts, error_out);
+ }
+ }
+ if (err) {
+ line->init_str = NULL;
+ line->valid = 0;
+ kfree(new);
+ }
+ }
+out:
+ return err;
+}
+
+/*
+ * Common setup code for both startup command line and mconsole initialization.
+ * @lines contains the array (of size @num) to modify;
+ * @init is the setup string;
+ * @error_out is an error string in the case of failure;
+ */
+
+int line_setup(char **conf, unsigned int num, char **def,
+ char *init, char *name)
+{
+ char *error;
+
+ if (*init == '=') {
+ /*
+ * We said con=/ssl= instead of con#=, so we are configuring all
+ * consoles at once.
+ */
+ *def = init + 1;
+ } else {
+ char *end;
+ unsigned n = simple_strtoul(init, &end, 0);
+
+ if (*end != '=') {
+ error = "Couldn't parse device number";
+ goto out;
+ }
+ if (n >= num) {
+ error = "Device number out of range";
+ goto out;
+ }
+ conf[n] = end + 1;
+ }
+ return 0;
+
+out:
+ printk(KERN_ERR "Failed to set up %s with "
+ "configuration string \"%s\" : %s\n", name, init, error);
+ return -EINVAL;
+}
+
+int line_config(struct line *lines, unsigned int num, char *str,
+ const struct chan_opts *opts, char **error_out)
+{
+ char *end;
+ int n;
+
+ if (*str == '=') {
+ *error_out = "Can't configure all devices from mconsole";
+ return -EINVAL;
+ }
+
+ n = simple_strtoul(str, &end, 0);
+ if (*end++ != '=') {
+ *error_out = "Couldn't parse device number";
+ return -EINVAL;
+ }
+ if (n >= num) {
+ *error_out = "Device number out of range";
+ return -EINVAL;
+ }
+
+ return setup_one_line(lines, n, end, opts, error_out);
+}
+
+int line_get_config(char *name, struct line *lines, unsigned int num, char *str,
+ int size, char **error_out)
+{
+ struct line *line;
+ char *end;
+ int dev, n = 0;
+
+ dev = simple_strtoul(name, &end, 0);
+ if ((*end != '\0') || (end == name)) {
+ *error_out = "line_get_config failed to parse device number";
+ return 0;
+ }
+
+ if ((dev < 0) || (dev >= num)) {
+ *error_out = "device number out of range";
+ return 0;
+ }
+
+ line = &lines[dev];
+
+ if (!line->valid)
+ CONFIG_CHUNK(str, size, n, "none", 1);
+ else {
+ struct tty_struct *tty = tty_port_tty_get(&line->port);
+ if (tty == NULL) {
+ CONFIG_CHUNK(str, size, n, line->init_str, 1);
+ } else {
+ n = chan_config_string(line, str, size, error_out);
+ tty_kref_put(tty);
+ }
+ }
+
+ return n;
+}
+
+int line_id(char **str, int *start_out, int *end_out)
+{
+ char *end;
+ int n;
+
+ n = simple_strtoul(*str, &end, 0);
+ if ((*end != '\0') || (end == *str))
+ return -1;
+
+ *str = end;
+ *start_out = n;
+ *end_out = n;
+ return n;
+}
+
+int line_remove(struct line *lines, unsigned int num, int n, char **error_out)
+{
+ if (n >= num) {
+ *error_out = "Device number out of range";
+ return -EINVAL;
+ }
+ return setup_one_line(lines, n, "none", NULL, error_out);
+}
+
+int register_lines(struct line_driver *line_driver,
+ const struct tty_operations *ops,
+ struct line *lines, int nlines)
+{
+ struct tty_driver *driver = alloc_tty_driver(nlines);
+ int err;
+ int i;
+
+ if (!driver)
+ return -ENOMEM;
+
+ driver->driver_name = line_driver->name;
+ driver->name = line_driver->device_name;
+ driver->major = line_driver->major;
+ driver->minor_start = line_driver->minor_start;
+ driver->type = line_driver->type;
+ driver->subtype = line_driver->subtype;
+ driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+ driver->init_termios = tty_std_termios;
+
+ for (i = 0; i < nlines; i++) {
+ tty_port_init(&lines[i].port);
+ lines[i].port.ops = &line_port_ops;
+ spin_lock_init(&lines[i].lock);
+ lines[i].driver = line_driver;
+ INIT_LIST_HEAD(&lines[i].chan_list);
+ }
+ tty_set_operations(driver, ops);
+
+ err = tty_register_driver(driver);
+ if (err) {
+ printk(KERN_ERR "register_lines : can't register %s driver\n",
+ line_driver->name);
+ put_tty_driver(driver);
+ for (i = 0; i < nlines; i++)
+ tty_port_destroy(&lines[i].port);
+ return err;
+ }
+
+ line_driver->driver = driver;
+ mconsole_register_dev(&line_driver->mc);
+ return 0;
+}
+
+static DEFINE_SPINLOCK(winch_handler_lock);
+static LIST_HEAD(winch_handlers);
+
+struct winch {
+ struct list_head list;
+ int fd;
+ int tty_fd;
+ int pid;
+ struct tty_port *port;
+ unsigned long stack;
+ struct work_struct work;
+};
+
+static void __free_winch(struct work_struct *work)
+{
+ struct winch *winch = container_of(work, struct winch, work);
+ um_free_irq(WINCH_IRQ, winch);
+
+ if (winch->pid != -1)
+ os_kill_process(winch->pid, 1);
+ if (winch->stack != 0)
+ free_stack(winch->stack, 0);
+ kfree(winch);
+}
+
+static void free_winch(struct winch *winch)
+{
+ int fd = winch->fd;
+ winch->fd = -1;
+ if (fd != -1)
+ os_close_file(fd);
+ list_del(&winch->list);
+ __free_winch(&winch->work);
+}
+
+static irqreturn_t winch_interrupt(int irq, void *data)
+{
+ struct winch *winch = data;
+ struct tty_struct *tty;
+ struct line *line;
+ int fd = winch->fd;
+ int err;
+ char c;
+ struct pid *pgrp;
+
+ if (fd != -1) {
+ err = generic_read(fd, &c, NULL);
+ if (err < 0) {
+ if (err != -EAGAIN) {
+ winch->fd = -1;
+ list_del(&winch->list);
+ os_close_file(fd);
+ printk(KERN_ERR "winch_interrupt : "
+ "read failed, errno = %d\n", -err);
+ printk(KERN_ERR "fd %d is losing SIGWINCH "
+ "support\n", winch->tty_fd);
+ INIT_WORK(&winch->work, __free_winch);
+ schedule_work(&winch->work);
+ return IRQ_HANDLED;
+ }
+ goto out;
+ }
+ }
+ tty = tty_port_tty_get(winch->port);
+ if (tty != NULL) {
+ line = tty->driver_data;
+ if (line != NULL) {
+ chan_window_size(line, &tty->winsize.ws_row,
+ &tty->winsize.ws_col);
+ pgrp = tty_get_pgrp(tty);
+ if (pgrp)
+ kill_pgrp(pgrp, SIGWINCH, 1);
+ put_pid(pgrp);
+ }
+ tty_kref_put(tty);
+ }
+ out:
+ if (winch->fd != -1)
+ reactivate_fd(winch->fd, WINCH_IRQ);
+ return IRQ_HANDLED;
+}
+
+void register_winch_irq(int fd, int tty_fd, int pid, struct tty_port *port,
+ unsigned long stack)
+{
+ struct winch *winch;
+
+ winch = kmalloc(sizeof(*winch), GFP_KERNEL);
+ if (winch == NULL) {
+ printk(KERN_ERR "register_winch_irq - kmalloc failed\n");
+ goto cleanup;
+ }
+
+ *winch = ((struct winch) { .list = LIST_HEAD_INIT(winch->list),
+ .fd = fd,
+ .tty_fd = tty_fd,
+ .pid = pid,
+ .port = port,
+ .stack = stack });
+
+ if (um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt,
+ IRQF_SHARED, "winch", winch) < 0) {
+ printk(KERN_ERR "register_winch_irq - failed to register "
+ "IRQ\n");
+ goto out_free;
+ }
+
+ spin_lock(&winch_handler_lock);
+ list_add(&winch->list, &winch_handlers);
+ spin_unlock(&winch_handler_lock);
+
+ return;
+
+ out_free:
+ kfree(winch);
+ cleanup:
+ os_kill_process(pid, 1);
+ os_close_file(fd);
+ if (stack != 0)
+ free_stack(stack, 0);
+}
+
+static void unregister_winch(struct tty_struct *tty)
+{
+ struct list_head *ele, *next;
+ struct winch *winch;
+ struct tty_struct *wtty;
+
+ spin_lock(&winch_handler_lock);
+
+ list_for_each_safe(ele, next, &winch_handlers) {
+ winch = list_entry(ele, struct winch, list);
+ wtty = tty_port_tty_get(winch->port);
+ if (wtty == tty) {
+ free_winch(winch);
+ break;
+ }
+ tty_kref_put(wtty);
+ }
+ spin_unlock(&winch_handler_lock);
+}
+
+static void winch_cleanup(void)
+{
+ struct list_head *ele, *next;
+ struct winch *winch;
+
+ spin_lock(&winch_handler_lock);
+
+ list_for_each_safe(ele, next, &winch_handlers) {
+ winch = list_entry(ele, struct winch, list);
+ free_winch(winch);
+ }
+
+ spin_unlock(&winch_handler_lock);
+}
+__uml_exitcall(winch_cleanup);
+
+char *add_xterm_umid(char *base)
+{
+ char *umid, *title;
+ int len;
+
+ umid = get_umid();
+ if (*umid == '\0')
+ return base;
+
+ len = strlen(base) + strlen(" ()") + strlen(umid) + 1;
+ title = kmalloc(len, GFP_KERNEL);
+ if (title == NULL) {
+ printk(KERN_ERR "Failed to allocate buffer for xterm title\n");
+ return base;
+ }
+
+ snprintf(title, len, "%s (%s)", base, umid);
+ return title;
+}
diff --git a/arch/um/drivers/line.h b/arch/um/drivers/line.h
new file mode 100644
index 0000000..138a145
--- /dev/null
+++ b/arch/um/drivers/line.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __LINE_H__
+#define __LINE_H__
+
+#include <linux/list.h>
+#include <linux/workqueue.h>
+#include <linux/tty.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include "chan_user.h"
+#include "mconsole_kern.h"
+
+/* There's only two modifiable fields in this - .mc.list and .driver */
+struct line_driver {
+ const char *name;
+ const char *device_name;
+ const short major;
+ const short minor_start;
+ const short type;
+ const short subtype;
+ const int read_irq;
+ const char *read_irq_name;
+ const int write_irq;
+ const char *write_irq_name;
+ struct mc_device mc;
+ struct tty_driver *driver;
+};
+
+struct line {
+ struct tty_port port;
+ int valid;
+
+ char *init_str;
+ struct list_head chan_list;
+ struct chan *chan_in, *chan_out;
+
+ /*This lock is actually, mostly, local to*/
+ spinlock_t lock;
+ int throttled;
+ /* Yes, this is a real circular buffer.
+ * XXX: And this should become a struct kfifo!
+ *
+ * buffer points to a buffer allocated on demand, of length
+ * LINE_BUFSIZE, head to the start of the ring, tail to the end.*/
+ char *buffer;
+ char *head;
+ char *tail;
+
+ int sigio;
+ struct delayed_work task;
+ const struct line_driver *driver;
+};
+
+extern void line_close(struct tty_struct *tty, struct file * filp);
+extern int line_open(struct tty_struct *tty, struct file *filp);
+extern int line_install(struct tty_driver *driver, struct tty_struct *tty,
+ struct line *line);
+extern void line_cleanup(struct tty_struct *tty);
+extern void line_hangup(struct tty_struct *tty);
+extern int line_setup(char **conf, unsigned nlines, char **def,
+ char *init, char *name);
+extern int line_write(struct tty_struct *tty, const unsigned char *buf,
+ int len);
+extern int line_put_char(struct tty_struct *tty, unsigned char ch);
+extern void line_set_termios(struct tty_struct *tty, struct ktermios * old);
+extern int line_chars_in_buffer(struct tty_struct *tty);
+extern void line_flush_buffer(struct tty_struct *tty);
+extern void line_flush_chars(struct tty_struct *tty);
+extern int line_write_room(struct tty_struct *tty);
+extern void line_throttle(struct tty_struct *tty);
+extern void line_unthrottle(struct tty_struct *tty);
+
+extern char *add_xterm_umid(char *base);
+extern int line_setup_irq(int fd, int input, int output, struct line *line,
+ void *data);
+extern void line_close_chan(struct line *line);
+extern int register_lines(struct line_driver *line_driver,
+ const struct tty_operations *driver,
+ struct line *lines, int nlines);
+extern int setup_one_line(struct line *lines, int n, char *init,
+ const struct chan_opts *opts, char **error_out);
+extern void close_lines(struct line *lines, int nlines);
+
+extern int line_config(struct line *lines, unsigned int sizeof_lines,
+ char *str, const struct chan_opts *opts,
+ char **error_out);
+extern int line_id(char **str, int *start_out, int *end_out);
+extern int line_remove(struct line *lines, unsigned int sizeof_lines, int n,
+ char **error_out);
+extern int line_get_config(char *dev, struct line *lines,
+ unsigned int sizeof_lines, char *str,
+ int size, char **error_out);
+
+#endif
diff --git a/arch/um/drivers/mconsole.h b/arch/um/drivers/mconsole.h
new file mode 100644
index 0000000..44af737
--- /dev/null
+++ b/arch/um/drivers/mconsole.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org)
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __MCONSOLE_H__
+#define __MCONSOLE_H__
+
+#ifdef __UM_HOST__
+#include <stdint.h>
+#define u32 uint32_t
+#endif
+
+#include <sysdep/ptrace.h>
+
+#define MCONSOLE_MAGIC (0xcafebabe)
+#define MCONSOLE_MAX_DATA (512)
+#define MCONSOLE_VERSION 2
+
+struct mconsole_request {
+ u32 magic;
+ u32 version;
+ u32 len;
+ char data[MCONSOLE_MAX_DATA];
+};
+
+struct mconsole_reply {
+ u32 err;
+ u32 more;
+ u32 len;
+ char data[MCONSOLE_MAX_DATA];
+};
+
+struct mconsole_notify {
+ u32 magic;
+ u32 version;
+ enum { MCONSOLE_SOCKET, MCONSOLE_PANIC, MCONSOLE_HANG,
+ MCONSOLE_USER_NOTIFY } type;
+ u32 len;
+ char data[MCONSOLE_MAX_DATA];
+};
+
+struct mc_request;
+
+enum mc_context { MCONSOLE_INTR, MCONSOLE_PROC };
+
+struct mconsole_command
+{
+ char *command;
+ void (*handler)(struct mc_request *req);
+ enum mc_context context;
+};
+
+struct mc_request
+{
+ int len;
+ int as_interrupt;
+
+ int originating_fd;
+ unsigned int originlen;
+ unsigned char origin[128]; /* sockaddr_un */
+
+ struct mconsole_request request;
+ struct mconsole_command *cmd;
+ struct uml_pt_regs regs;
+};
+
+extern char mconsole_socket_name[];
+
+extern int mconsole_unlink_socket(void);
+extern int mconsole_reply_len(struct mc_request *req, const char *reply,
+ int len, int err, int more);
+extern int mconsole_reply(struct mc_request *req, const char *str, int err,
+ int more);
+
+extern void mconsole_version(struct mc_request *req);
+extern void mconsole_help(struct mc_request *req);
+extern void mconsole_halt(struct mc_request *req);
+extern void mconsole_reboot(struct mc_request *req);
+extern void mconsole_config(struct mc_request *req);
+extern void mconsole_remove(struct mc_request *req);
+extern void mconsole_sysrq(struct mc_request *req);
+extern void mconsole_cad(struct mc_request *req);
+extern void mconsole_stop(struct mc_request *req);
+extern void mconsole_go(struct mc_request *req);
+extern void mconsole_log(struct mc_request *req);
+extern void mconsole_proc(struct mc_request *req);
+extern void mconsole_stack(struct mc_request *req);
+
+extern int mconsole_get_request(int fd, struct mc_request *req);
+extern int mconsole_notify(char *sock_name, int type, const void *data,
+ int len);
+extern char *mconsole_notify_socket(void);
+extern void lock_notify(void);
+extern void unlock_notify(void);
+
+#endif
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
new file mode 100644
index 0000000..d5f9a2d
--- /dev/null
+++ b/arch/um/drivers/mconsole_kern.c
@@ -0,0 +1,847 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org)
+ * Copyright (C) 2001 - 2008 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/console.h>
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/sched/debug.h>
+#include <linux/proc_fs.h>
+#include <linux/slab.h>
+#include <linux/syscalls.h>
+#include <linux/utsname.h>
+#include <linux/socket.h>
+#include <linux/un.h>
+#include <linux/workqueue.h>
+#include <linux/mutex.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/file.h>
+#include <linux/uaccess.h>
+#include <asm/switch_to.h>
+
+#include <init.h>
+#include <irq_kern.h>
+#include <irq_user.h>
+#include <kern_util.h>
+#include "mconsole.h"
+#include "mconsole_kern.h"
+#include <os.h>
+
+static int do_unlink_socket(struct notifier_block *notifier,
+ unsigned long what, void *data)
+{
+ return mconsole_unlink_socket();
+}
+
+
+static struct notifier_block reboot_notifier = {
+ .notifier_call = do_unlink_socket,
+ .priority = 0,
+};
+
+/* Safe without explicit locking for now. Tasklets provide their own
+ * locking, and the interrupt handler is safe because it can't interrupt
+ * itself and it can only happen on CPU 0.
+ */
+
+static LIST_HEAD(mc_requests);
+
+static void mc_work_proc(struct work_struct *unused)
+{
+ struct mconsole_entry *req;
+ unsigned long flags;
+
+ while (!list_empty(&mc_requests)) {
+ local_irq_save(flags);
+ req = list_entry(mc_requests.next, struct mconsole_entry, list);
+ list_del(&req->list);
+ local_irq_restore(flags);
+ req->request.cmd->handler(&req->request);
+ kfree(req);
+ }
+}
+
+static DECLARE_WORK(mconsole_work, mc_work_proc);
+
+static irqreturn_t mconsole_interrupt(int irq, void *dev_id)
+{
+ /* long to avoid size mismatch warnings from gcc */
+ long fd;
+ struct mconsole_entry *new;
+ static struct mc_request req; /* that's OK */
+
+ fd = (long) dev_id;
+ while (mconsole_get_request(fd, &req)) {
+ if (req.cmd->context == MCONSOLE_INTR)
+ (*req.cmd->handler)(&req);
+ else {
+ new = kmalloc(sizeof(*new), GFP_NOWAIT);
+ if (new == NULL)
+ mconsole_reply(&req, "Out of memory", 1, 0);
+ else {
+ new->request = req;
+ new->request.regs = get_irq_regs()->regs;
+ list_add(&new->list, &mc_requests);
+ }
+ }
+ }
+ if (!list_empty(&mc_requests))
+ schedule_work(&mconsole_work);
+ reactivate_fd(fd, MCONSOLE_IRQ);
+ return IRQ_HANDLED;
+}
+
+void mconsole_version(struct mc_request *req)
+{
+ char version[256];
+
+ sprintf(version, "%s %s %s %s %s", utsname()->sysname,
+ utsname()->nodename, utsname()->release, utsname()->version,
+ utsname()->machine);
+ mconsole_reply(req, version, 0, 0);
+}
+
+void mconsole_log(struct mc_request *req)
+{
+ int len;
+ char *ptr = req->request.data;
+
+ ptr += strlen("log ");
+
+ len = req->len - (ptr - req->request.data);
+ printk(KERN_WARNING "%.*s", len, ptr);
+ mconsole_reply(req, "", 0, 0);
+}
+
+void mconsole_proc(struct mc_request *req)
+{
+ struct vfsmount *mnt = task_active_pid_ns(current)->proc_mnt;
+ char *buf;
+ int len;
+ struct file *file;
+ int first_chunk = 1;
+ char *ptr = req->request.data;
+ loff_t pos = 0;
+
+ ptr += strlen("proc");
+ ptr = skip_spaces(ptr);
+
+ file = file_open_root(mnt->mnt_root, mnt, ptr, O_RDONLY, 0);
+ if (IS_ERR(file)) {
+ mconsole_reply(req, "Failed to open file", 1, 0);
+ printk(KERN_ERR "open /proc/%s: %ld\n", ptr, PTR_ERR(file));
+ goto out;
+ }
+
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (buf == NULL) {
+ mconsole_reply(req, "Failed to allocate buffer", 1, 0);
+ goto out_fput;
+ }
+
+ do {
+ len = kernel_read(file, buf, PAGE_SIZE - 1, &pos);
+ if (len < 0) {
+ mconsole_reply(req, "Read of file failed", 1, 0);
+ goto out_free;
+ }
+ /* Begin the file content on his own line. */
+ if (first_chunk) {
+ mconsole_reply(req, "\n", 0, 1);
+ first_chunk = 0;
+ }
+ buf[len] = '\0';
+ mconsole_reply(req, buf, 0, (len > 0));
+ } while (len > 0);
+ out_free:
+ kfree(buf);
+ out_fput:
+ fput(file);
+ out: ;
+}
+
+#define UML_MCONSOLE_HELPTEXT \
+"Commands: \n\
+ version - Get kernel version \n\
+ help - Print this message \n\
+ halt - Halt UML \n\
+ reboot - Reboot UML \n\
+ config <dev>=<config> - Add a new device to UML; \n\
+ same syntax as command line \n\
+ config <dev> - Query the configuration of a device \n\
+ remove <dev> - Remove a device from UML \n\
+ sysrq <letter> - Performs the SysRq action controlled by the letter \n\
+ cad - invoke the Ctrl-Alt-Del handler \n\
+ stop - pause the UML; it will do nothing until it receives a 'go' \n\
+ go - continue the UML after a 'stop' \n\
+ log <string> - make UML enter <string> into the kernel log\n\
+ proc <file> - returns the contents of the UML's /proc/<file>\n\
+ stack <pid> - returns the stack of the specified pid\n\
+"
+
+void mconsole_help(struct mc_request *req)
+{
+ mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0);
+}
+
+void mconsole_halt(struct mc_request *req)
+{
+ mconsole_reply(req, "", 0, 0);
+ machine_halt();
+}
+
+void mconsole_reboot(struct mc_request *req)
+{
+ mconsole_reply(req, "", 0, 0);
+ machine_restart(NULL);
+}
+
+void mconsole_cad(struct mc_request *req)
+{
+ mconsole_reply(req, "", 0, 0);
+ ctrl_alt_del();
+}
+
+void mconsole_go(struct mc_request *req)
+{
+ mconsole_reply(req, "Not stopped", 1, 0);
+}
+
+void mconsole_stop(struct mc_request *req)
+{
+ deactivate_fd(req->originating_fd, MCONSOLE_IRQ);
+ os_set_fd_block(req->originating_fd, 1);
+ mconsole_reply(req, "stopped", 0, 0);
+ for (;;) {
+ if (!mconsole_get_request(req->originating_fd, req))
+ continue;
+ if (req->cmd->handler == mconsole_go)
+ break;
+ if (req->cmd->handler == mconsole_stop) {
+ mconsole_reply(req, "Already stopped", 1, 0);
+ continue;
+ }
+ if (req->cmd->handler == mconsole_sysrq) {
+ struct pt_regs *old_regs;
+ old_regs = set_irq_regs((struct pt_regs *)&req->regs);
+ mconsole_sysrq(req);
+ set_irq_regs(old_regs);
+ continue;
+ }
+ (*req->cmd->handler)(req);
+ }
+ os_set_fd_block(req->originating_fd, 0);
+ reactivate_fd(req->originating_fd, MCONSOLE_IRQ);
+ mconsole_reply(req, "", 0, 0);
+}
+
+static DEFINE_SPINLOCK(mc_devices_lock);
+static LIST_HEAD(mconsole_devices);
+
+void mconsole_register_dev(struct mc_device *new)
+{
+ spin_lock(&mc_devices_lock);
+ BUG_ON(!list_empty(&new->list));
+ list_add(&new->list, &mconsole_devices);
+ spin_unlock(&mc_devices_lock);
+}
+
+static struct mc_device *mconsole_find_dev(char *name)
+{
+ struct list_head *ele;
+ struct mc_device *dev;
+
+ list_for_each(ele, &mconsole_devices) {
+ dev = list_entry(ele, struct mc_device, list);
+ if (!strncmp(name, dev->name, strlen(dev->name)))
+ return dev;
+ }
+ return NULL;
+}
+
+#define UNPLUGGED_PER_PAGE \
+ ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long))
+
+struct unplugged_pages {
+ struct list_head list;
+ void *pages[UNPLUGGED_PER_PAGE];
+};
+
+static DEFINE_MUTEX(plug_mem_mutex);
+static unsigned long long unplugged_pages_count = 0;
+static LIST_HEAD(unplugged_pages);
+static int unplug_index = UNPLUGGED_PER_PAGE;
+
+static int mem_config(char *str, char **error_out)
+{
+ unsigned long long diff;
+ int err = -EINVAL, i, add;
+ char *ret;
+
+ if (str[0] != '=') {
+ *error_out = "Expected '=' after 'mem'";
+ goto out;
+ }
+
+ str++;
+ if (str[0] == '-')
+ add = 0;
+ else if (str[0] == '+') {
+ add = 1;
+ }
+ else {
+ *error_out = "Expected increment to start with '-' or '+'";
+ goto out;
+ }
+
+ str++;
+ diff = memparse(str, &ret);
+ if (*ret != '\0') {
+ *error_out = "Failed to parse memory increment";
+ goto out;
+ }
+
+ diff /= PAGE_SIZE;
+
+ mutex_lock(&plug_mem_mutex);
+ for (i = 0; i < diff; i++) {
+ struct unplugged_pages *unplugged;
+ void *addr;
+
+ if (add) {
+ if (list_empty(&unplugged_pages))
+ break;
+
+ unplugged = list_entry(unplugged_pages.next,
+ struct unplugged_pages, list);
+ if (unplug_index > 0)
+ addr = unplugged->pages[--unplug_index];
+ else {
+ list_del(&unplugged->list);
+ addr = unplugged;
+ unplug_index = UNPLUGGED_PER_PAGE;
+ }
+
+ free_page((unsigned long) addr);
+ unplugged_pages_count--;
+ }
+ else {
+ struct page *page;
+
+ page = alloc_page(GFP_ATOMIC);
+ if (page == NULL)
+ break;
+
+ unplugged = page_address(page);
+ if (unplug_index == UNPLUGGED_PER_PAGE) {
+ list_add(&unplugged->list, &unplugged_pages);
+ unplug_index = 0;
+ }
+ else {
+ struct list_head *entry = unplugged_pages.next;
+ addr = unplugged;
+
+ unplugged = list_entry(entry,
+ struct unplugged_pages,
+ list);
+ err = os_drop_memory(addr, PAGE_SIZE);
+ if (err) {
+ printk(KERN_ERR "Failed to release "
+ "memory - errno = %d\n", err);
+ *error_out = "Failed to release memory";
+ goto out_unlock;
+ }
+ unplugged->pages[unplug_index++] = addr;
+ }
+
+ unplugged_pages_count++;
+ }
+ }
+
+ err = 0;
+out_unlock:
+ mutex_unlock(&plug_mem_mutex);
+out:
+ return err;
+}
+
+static int mem_get_config(char *name, char *str, int size, char **error_out)
+{
+ char buf[sizeof("18446744073709551615")];
+ int len = 0;
+
+ sprintf(buf, "%ld", uml_physmem);
+ CONFIG_CHUNK(str, size, len, buf, 1);
+
+ return len;
+}
+
+static int mem_id(char **str, int *start_out, int *end_out)
+{
+ *start_out = 0;
+ *end_out = 0;
+
+ return 0;
+}
+
+static int mem_remove(int n, char **error_out)
+{
+ *error_out = "Memory doesn't support the remove operation";
+ return -EBUSY;
+}
+
+static struct mc_device mem_mc = {
+ .list = LIST_HEAD_INIT(mem_mc.list),
+ .name = "mem",
+ .config = mem_config,
+ .get_config = mem_get_config,
+ .id = mem_id,
+ .remove = mem_remove,
+};
+
+static int __init mem_mc_init(void)
+{
+ if (can_drop_memory())
+ mconsole_register_dev(&mem_mc);
+ else printk(KERN_ERR "Can't release memory to the host - memory "
+ "hotplug won't be supported\n");
+ return 0;
+}
+
+__initcall(mem_mc_init);
+
+#define CONFIG_BUF_SIZE 64
+
+static void mconsole_get_config(int (*get_config)(char *, char *, int,
+ char **),
+ struct mc_request *req, char *name)
+{
+ char default_buf[CONFIG_BUF_SIZE], *error, *buf;
+ int n, size;
+
+ if (get_config == NULL) {
+ mconsole_reply(req, "No get_config routine defined", 1, 0);
+ return;
+ }
+
+ error = NULL;
+ size = ARRAY_SIZE(default_buf);
+ buf = default_buf;
+
+ while (1) {
+ n = (*get_config)(name, buf, size, &error);
+ if (error != NULL) {
+ mconsole_reply(req, error, 1, 0);
+ goto out;
+ }
+
+ if (n <= size) {
+ mconsole_reply(req, buf, 0, 0);
+ goto out;
+ }
+
+ if (buf != default_buf)
+ kfree(buf);
+
+ size = n;
+ buf = kmalloc(size, GFP_KERNEL);
+ if (buf == NULL) {
+ mconsole_reply(req, "Failed to allocate buffer", 1, 0);
+ return;
+ }
+ }
+ out:
+ if (buf != default_buf)
+ kfree(buf);
+}
+
+void mconsole_config(struct mc_request *req)
+{
+ struct mc_device *dev;
+ char *ptr = req->request.data, *name, *error_string = "";
+ int err;
+
+ ptr += strlen("config");
+ ptr = skip_spaces(ptr);
+ dev = mconsole_find_dev(ptr);
+ if (dev == NULL) {
+ mconsole_reply(req, "Bad configuration option", 1, 0);
+ return;
+ }
+
+ name = &ptr[strlen(dev->name)];
+ ptr = name;
+ while ((*ptr != '=') && (*ptr != '\0'))
+ ptr++;
+
+ if (*ptr == '=') {
+ err = (*dev->config)(name, &error_string);
+ mconsole_reply(req, error_string, err, 0);
+ }
+ else mconsole_get_config(dev->get_config, req, name);
+}
+
+void mconsole_remove(struct mc_request *req)
+{
+ struct mc_device *dev;
+ char *ptr = req->request.data, *err_msg = "";
+ char error[256];
+ int err, start, end, n;
+
+ ptr += strlen("remove");
+ ptr = skip_spaces(ptr);
+ dev = mconsole_find_dev(ptr);
+ if (dev == NULL) {
+ mconsole_reply(req, "Bad remove option", 1, 0);
+ return;
+ }
+
+ ptr = &ptr[strlen(dev->name)];
+
+ err = 1;
+ n = (*dev->id)(&ptr, &start, &end);
+ if (n < 0) {
+ err_msg = "Couldn't parse device number";
+ goto out;
+ }
+ else if ((n < start) || (n > end)) {
+ sprintf(error, "Invalid device number - must be between "
+ "%d and %d", start, end);
+ err_msg = error;
+ goto out;
+ }
+
+ err_msg = NULL;
+ err = (*dev->remove)(n, &err_msg);
+ switch(err) {
+ case 0:
+ err_msg = "";
+ break;
+ case -ENODEV:
+ if (err_msg == NULL)
+ err_msg = "Device doesn't exist";
+ break;
+ case -EBUSY:
+ if (err_msg == NULL)
+ err_msg = "Device is currently open";
+ break;
+ default:
+ break;
+ }
+out:
+ mconsole_reply(req, err_msg, err, 0);
+}
+
+struct mconsole_output {
+ struct list_head list;
+ struct mc_request *req;
+};
+
+static DEFINE_SPINLOCK(client_lock);
+static LIST_HEAD(clients);
+static char console_buf[MCONSOLE_MAX_DATA];
+
+static void console_write(struct console *console, const char *string,
+ unsigned int len)
+{
+ struct list_head *ele;
+ int n;
+
+ if (list_empty(&clients))
+ return;
+
+ while (len > 0) {
+ n = min((size_t) len, ARRAY_SIZE(console_buf));
+ strncpy(console_buf, string, n);
+ string += n;
+ len -= n;
+
+ list_for_each(ele, &clients) {
+ struct mconsole_output *entry;
+
+ entry = list_entry(ele, struct mconsole_output, list);
+ mconsole_reply_len(entry->req, console_buf, n, 0, 1);
+ }
+ }
+}
+
+static struct console mc_console = { .name = "mc",
+ .write = console_write,
+ .flags = CON_ENABLED,
+ .index = -1 };
+
+static int mc_add_console(void)
+{
+ register_console(&mc_console);
+ return 0;
+}
+
+late_initcall(mc_add_console);
+
+static void with_console(struct mc_request *req, void (*proc)(void *),
+ void *arg)
+{
+ struct mconsole_output entry;
+ unsigned long flags;
+
+ entry.req = req;
+ spin_lock_irqsave(&client_lock, flags);
+ list_add(&entry.list, &clients);
+ spin_unlock_irqrestore(&client_lock, flags);
+
+ (*proc)(arg);
+
+ mconsole_reply_len(req, "", 0, 0, 0);
+
+ spin_lock_irqsave(&client_lock, flags);
+ list_del(&entry.list);
+ spin_unlock_irqrestore(&client_lock, flags);
+}
+
+#ifdef CONFIG_MAGIC_SYSRQ
+
+#include <linux/sysrq.h>
+
+static void sysrq_proc(void *arg)
+{
+ char *op = arg;
+ handle_sysrq(*op);
+}
+
+void mconsole_sysrq(struct mc_request *req)
+{
+ char *ptr = req->request.data;
+
+ ptr += strlen("sysrq");
+ ptr = skip_spaces(ptr);
+
+ /*
+ * With 'b', the system will shut down without a chance to reply,
+ * so in this case, we reply first.
+ */
+ if (*ptr == 'b')
+ mconsole_reply(req, "", 0, 0);
+
+ with_console(req, sysrq_proc, ptr);
+}
+#else
+void mconsole_sysrq(struct mc_request *req)
+{
+ mconsole_reply(req, "Sysrq not compiled in", 1, 0);
+}
+#endif
+
+static void stack_proc(void *arg)
+{
+ struct task_struct *task = arg;
+
+ show_stack(task, NULL);
+}
+
+/*
+ * Mconsole stack trace
+ * Added by Allan Graves, Jeff Dike
+ * Dumps a stacks registers to the linux console.
+ * Usage stack <pid>.
+ */
+void mconsole_stack(struct mc_request *req)
+{
+ char *ptr = req->request.data;
+ int pid_requested= -1;
+ struct task_struct *to = NULL;
+
+ /*
+ * Would be nice:
+ * 1) Send showregs output to mconsole.
+ * 2) Add a way to stack dump all pids.
+ */
+
+ ptr += strlen("stack");
+ ptr = skip_spaces(ptr);
+
+ /*
+ * Should really check for multiple pids or reject bad args here
+ */
+ /* What do the arguments in mconsole_reply mean? */
+ if (sscanf(ptr, "%d", &pid_requested) == 0) {
+ mconsole_reply(req, "Please specify a pid", 1, 0);
+ return;
+ }
+
+ to = find_task_by_pid_ns(pid_requested, &init_pid_ns);
+ if ((to == NULL) || (pid_requested == 0)) {
+ mconsole_reply(req, "Couldn't find that pid", 1, 0);
+ return;
+ }
+ with_console(req, stack_proc, to);
+}
+
+/*
+ * Changed by mconsole_setup, which is __setup, and called before SMP is
+ * active.
+ */
+static char *notify_socket = NULL;
+
+static int __init mconsole_init(void)
+{
+ /* long to avoid size mismatch warnings from gcc */
+ long sock;
+ int err;
+ char file[UNIX_PATH_MAX];
+
+ if (umid_file_name("mconsole", file, sizeof(file)))
+ return -1;
+ snprintf(mconsole_socket_name, sizeof(file), "%s", file);
+
+ sock = os_create_unix_socket(file, sizeof(file), 1);
+ if (sock < 0) {
+ printk(KERN_ERR "Failed to initialize management console\n");
+ return 1;
+ }
+ if (os_set_fd_block(sock, 0))
+ goto out;
+
+ register_reboot_notifier(&reboot_notifier);
+
+ err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt,
+ IRQF_SHARED, "mconsole", (void *)sock);
+ if (err) {
+ printk(KERN_ERR "Failed to get IRQ for management console\n");
+ goto out;
+ }
+
+ if (notify_socket != NULL) {
+ notify_socket = kstrdup(notify_socket, GFP_KERNEL);
+ if (notify_socket != NULL)
+ mconsole_notify(notify_socket, MCONSOLE_SOCKET,
+ mconsole_socket_name,
+ strlen(mconsole_socket_name) + 1);
+ else printk(KERN_ERR "mconsole_setup failed to strdup "
+ "string\n");
+ }
+
+ printk(KERN_INFO "mconsole (version %d) initialized on %s\n",
+ MCONSOLE_VERSION, mconsole_socket_name);
+ return 0;
+
+ out:
+ os_close_file(sock);
+ return 1;
+}
+
+__initcall(mconsole_init);
+
+static ssize_t mconsole_proc_write(struct file *file,
+ const char __user *buffer, size_t count, loff_t *pos)
+{
+ char *buf;
+
+ buf = memdup_user_nul(buffer, count);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count);
+ kfree(buf);
+ return count;
+}
+
+static const struct file_operations mconsole_proc_fops = {
+ .owner = THIS_MODULE,
+ .write = mconsole_proc_write,
+ .llseek = noop_llseek,
+};
+
+static int create_proc_mconsole(void)
+{
+ struct proc_dir_entry *ent;
+
+ if (notify_socket == NULL)
+ return 0;
+
+ ent = proc_create("mconsole", 0200, NULL, &mconsole_proc_fops);
+ if (ent == NULL) {
+ printk(KERN_INFO "create_proc_mconsole : proc_create failed\n");
+ return 0;
+ }
+ return 0;
+}
+
+static DEFINE_SPINLOCK(notify_spinlock);
+
+void lock_notify(void)
+{
+ spin_lock(¬ify_spinlock);
+}
+
+void unlock_notify(void)
+{
+ spin_unlock(¬ify_spinlock);
+}
+
+__initcall(create_proc_mconsole);
+
+#define NOTIFY "notify:"
+
+static int mconsole_setup(char *str)
+{
+ if (!strncmp(str, NOTIFY, strlen(NOTIFY))) {
+ str += strlen(NOTIFY);
+ notify_socket = str;
+ }
+ else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str);
+ return 1;
+}
+
+__setup("mconsole=", mconsole_setup);
+
+__uml_help(mconsole_setup,
+"mconsole=notify:<socket>\n"
+" Requests that the mconsole driver send a message to the named Unix\n"
+" socket containing the name of the mconsole socket. This also serves\n"
+" to notify outside processes when UML has booted far enough to respond\n"
+" to mconsole requests.\n\n"
+);
+
+static int notify_panic(struct notifier_block *self, unsigned long unused1,
+ void *ptr)
+{
+ char *message = ptr;
+
+ if (notify_socket == NULL)
+ return 0;
+
+ mconsole_notify(notify_socket, MCONSOLE_PANIC, message,
+ strlen(message) + 1);
+ return 0;
+}
+
+static struct notifier_block panic_exit_notifier = {
+ .notifier_call = notify_panic,
+ .next = NULL,
+ .priority = 1
+};
+
+static int add_notifier(void)
+{
+ atomic_notifier_chain_register(&panic_notifier_list,
+ &panic_exit_notifier);
+ return 0;
+}
+
+__initcall(add_notifier);
+
+char *mconsole_notify_socket(void)
+{
+ return notify_socket;
+}
+
+EXPORT_SYMBOL(mconsole_notify_socket);
diff --git a/arch/um/drivers/mconsole_kern.h b/arch/um/drivers/mconsole_kern.h
new file mode 100644
index 0000000..7a0c6a1
--- /dev/null
+++ b/arch/um/drivers/mconsole_kern.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __MCONSOLE_KERN_H__
+#define __MCONSOLE_KERN_H__
+
+#include <linux/list.h>
+#include "mconsole.h"
+
+struct mconsole_entry {
+ struct list_head list;
+ struct mc_request request;
+};
+
+/* All these methods are called in process context. */
+struct mc_device {
+ struct list_head list;
+ char *name;
+ int (*config)(char *, char **);
+ int (*get_config)(char *, char *, int, char **);
+ int (*id)(char **, int *, int *);
+ int (*remove)(int, char **);
+};
+
+#define CONFIG_CHUNK(str, size, current, chunk, end) \
+do { \
+ current += strlen(chunk); \
+ if(current >= size) \
+ str = NULL; \
+ if(str != NULL){ \
+ strcpy(str, chunk); \
+ str += strlen(chunk); \
+ } \
+ if(end) \
+ current++; \
+} while(0)
+
+#ifdef CONFIG_MCONSOLE
+
+extern void mconsole_register_dev(struct mc_device *new);
+
+#else
+
+static inline void mconsole_register_dev(struct mc_device *new)
+{
+}
+
+#endif
+
+#endif
diff --git a/arch/um/drivers/mconsole_user.c b/arch/um/drivers/mconsole_user.c
new file mode 100644
index 0000000..9920982
--- /dev/null
+++ b/arch/um/drivers/mconsole_user.c
@@ -0,0 +1,219 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org)
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <sys/un.h>
+#include "mconsole.h"
+
+static struct mconsole_command commands[] = {
+ /*
+ * With uts namespaces, uts information becomes process-specific, so
+ * we need a process context. If we try handling this in interrupt
+ * context, we may hit an exiting process without a valid uts
+ * namespace.
+ */
+ { "version", mconsole_version, MCONSOLE_PROC },
+ { "halt", mconsole_halt, MCONSOLE_PROC },
+ { "reboot", mconsole_reboot, MCONSOLE_PROC },
+ { "config", mconsole_config, MCONSOLE_PROC },
+ { "remove", mconsole_remove, MCONSOLE_PROC },
+ { "sysrq", mconsole_sysrq, MCONSOLE_INTR },
+ { "help", mconsole_help, MCONSOLE_INTR },
+ { "cad", mconsole_cad, MCONSOLE_INTR },
+ { "stop", mconsole_stop, MCONSOLE_PROC },
+ { "go", mconsole_go, MCONSOLE_INTR },
+ { "log", mconsole_log, MCONSOLE_INTR },
+ { "proc", mconsole_proc, MCONSOLE_PROC },
+ { "stack", mconsole_stack, MCONSOLE_INTR },
+};
+
+/* Initialized in mconsole_init, which is an initcall */
+char mconsole_socket_name[256];
+
+static int mconsole_reply_v0(struct mc_request *req, char *reply)
+{
+ struct iovec iov;
+ struct msghdr msg;
+
+ iov.iov_base = reply;
+ iov.iov_len = strlen(reply);
+
+ msg.msg_name = &(req->origin);
+ msg.msg_namelen = req->originlen;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ return sendmsg(req->originating_fd, &msg, 0);
+}
+
+static struct mconsole_command *mconsole_parse(struct mc_request *req)
+{
+ struct mconsole_command *cmd;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(commands); i++) {
+ cmd = &commands[i];
+ if (!strncmp(req->request.data, cmd->command,
+ strlen(cmd->command))) {
+ return cmd;
+ }
+ }
+ return NULL;
+}
+
+#define MIN(a,b) ((a)<(b) ? (a):(b))
+
+#define STRINGX(x) #x
+#define STRING(x) STRINGX(x)
+
+int mconsole_get_request(int fd, struct mc_request *req)
+{
+ int len;
+
+ req->originlen = sizeof(req->origin);
+ req->len = recvfrom(fd, &req->request, sizeof(req->request), 0,
+ (struct sockaddr *) req->origin, &req->originlen);
+ if (req->len < 0)
+ return 0;
+
+ req->originating_fd = fd;
+
+ if (req->request.magic != MCONSOLE_MAGIC) {
+ /* Unversioned request */
+ len = MIN(sizeof(req->request.data) - 1,
+ strlen((char *) &req->request));
+ memmove(req->request.data, &req->request, len);
+ req->request.data[len] = '\0';
+
+ req->request.magic = MCONSOLE_MAGIC;
+ req->request.version = 0;
+ req->request.len = len;
+
+ mconsole_reply_v0(req, "ERR Version 0 mconsole clients are "
+ "not supported by this driver");
+ return 0;
+ }
+
+ if (req->request.len >= MCONSOLE_MAX_DATA) {
+ mconsole_reply(req, "Request too large", 1, 0);
+ return 0;
+ }
+ if (req->request.version != MCONSOLE_VERSION) {
+ mconsole_reply(req, "This driver only supports version "
+ STRING(MCONSOLE_VERSION) " clients", 1, 0);
+ }
+
+ req->request.data[req->request.len] = '\0';
+ req->cmd = mconsole_parse(req);
+ if (req->cmd == NULL) {
+ mconsole_reply(req, "Unknown command", 1, 0);
+ return 0;
+ }
+
+ return 1;
+}
+
+int mconsole_reply_len(struct mc_request *req, const char *str, int total,
+ int err, int more)
+{
+ /*
+ * XXX This is a stack consumption problem. It'd be nice to
+ * make it global and serialize access to it, but there are a
+ * ton of callers to this function.
+ */
+ struct mconsole_reply reply;
+ int len, n;
+
+ do {
+ reply.err = err;
+
+ /* err can only be true on the first packet */
+ err = 0;
+
+ len = MIN(total, MCONSOLE_MAX_DATA - 1);
+
+ if (len == total) reply.more = more;
+ else reply.more = 1;
+
+ memcpy(reply.data, str, len);
+ reply.data[len] = '\0';
+ total -= len;
+ str += len;
+ reply.len = len + 1;
+
+ len = sizeof(reply) + reply.len - sizeof(reply.data);
+
+ n = sendto(req->originating_fd, &reply, len, 0,
+ (struct sockaddr *) req->origin, req->originlen);
+
+ if (n < 0)
+ return -errno;
+ } while (total > 0);
+ return 0;
+}
+
+int mconsole_reply(struct mc_request *req, const char *str, int err, int more)
+{
+ return mconsole_reply_len(req, str, strlen(str), err, more);
+}
+
+
+int mconsole_unlink_socket(void)
+{
+ unlink(mconsole_socket_name);
+ return 0;
+}
+
+static int notify_sock = -1;
+
+int mconsole_notify(char *sock_name, int type, const void *data, int len)
+{
+ struct sockaddr_un target;
+ struct mconsole_notify packet;
+ int n, err = 0;
+
+ lock_notify();
+ if (notify_sock < 0) {
+ notify_sock = socket(PF_UNIX, SOCK_DGRAM, 0);
+ if (notify_sock < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "mconsole_notify - socket failed, "
+ "errno = %d\n", errno);
+ }
+ }
+ unlock_notify();
+
+ if (err)
+ return err;
+
+ target.sun_family = AF_UNIX;
+ strcpy(target.sun_path, sock_name);
+
+ packet.magic = MCONSOLE_MAGIC;
+ packet.version = MCONSOLE_VERSION;
+ packet.type = type;
+ len = (len > sizeof(packet.data)) ? sizeof(packet.data) : len;
+ packet.len = len;
+ memcpy(packet.data, data, len);
+
+ err = 0;
+ len = sizeof(packet) + packet.len - sizeof(packet.data);
+ n = sendto(notify_sock, &packet, len, 0, (struct sockaddr *) &target,
+ sizeof(target));
+ if (n < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "mconsole_notify - sendto failed, "
+ "errno = %d\n", errno);
+ }
+ return err;
+}
diff --git a/arch/um/drivers/mmapper_kern.c b/arch/um/drivers/mmapper_kern.c
new file mode 100644
index 0000000..3645fcb
--- /dev/null
+++ b/arch/um/drivers/mmapper_kern.c
@@ -0,0 +1,134 @@
+/*
+ * arch/um/drivers/mmapper_kern.c
+ *
+ * BRIEF MODULE DESCRIPTION
+ *
+ * Copyright (C) 2000 RidgeRun, Inc.
+ * Author: RidgeRun, Inc.
+ * Greg Lonnon glonnon@ridgerun.com or info@ridgerun.com
+ *
+ */
+
+#include <linux/stddef.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+
+#include <linux/uaccess.h>
+#include <mem_user.h>
+
+/* These are set in mmapper_init, which is called at boot time */
+static unsigned long mmapper_size;
+static unsigned long p_buf;
+static char *v_buf;
+
+static ssize_t mmapper_read(struct file *file, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ return simple_read_from_buffer(buf, count, ppos, v_buf, mmapper_size);
+}
+
+static ssize_t mmapper_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ if (*ppos > mmapper_size)
+ return -EINVAL;
+
+ return simple_write_to_buffer(v_buf, mmapper_size, ppos, buf, count);
+}
+
+static long mmapper_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ return -ENOIOCTLCMD;
+}
+
+static int mmapper_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ int ret = -EINVAL;
+ int size;
+
+ if (vma->vm_pgoff != 0)
+ goto out;
+
+ size = vma->vm_end - vma->vm_start;
+ if (size > mmapper_size)
+ return -EFAULT;
+
+ /*
+ * XXX A comment above remap_pfn_range says it should only be
+ * called when the mm semaphore is held
+ */
+ if (remap_pfn_range(vma, vma->vm_start, p_buf >> PAGE_SHIFT, size,
+ vma->vm_page_prot))
+ goto out;
+ ret = 0;
+out:
+ return ret;
+}
+
+static int mmapper_open(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
+static int mmapper_release(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
+static const struct file_operations mmapper_fops = {
+ .owner = THIS_MODULE,
+ .read = mmapper_read,
+ .write = mmapper_write,
+ .unlocked_ioctl = mmapper_ioctl,
+ .mmap = mmapper_mmap,
+ .open = mmapper_open,
+ .release = mmapper_release,
+ .llseek = default_llseek,
+};
+
+/*
+ * No locking needed - only used (and modified) by below initcall and exitcall.
+ */
+static struct miscdevice mmapper_dev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "mmapper",
+ .fops = &mmapper_fops
+};
+
+static int __init mmapper_init(void)
+{
+ int err;
+
+ printk(KERN_INFO "Mapper v0.1\n");
+
+ v_buf = (char *) find_iomem("mmapper", &mmapper_size);
+ if (mmapper_size == 0) {
+ printk(KERN_ERR "mmapper_init - find_iomem failed\n");
+ return -ENODEV;
+ }
+ p_buf = __pa(v_buf);
+
+ err = misc_register(&mmapper_dev);
+ if (err) {
+ printk(KERN_ERR "mmapper - misc_register failed, err = %d\n",
+ err);
+ return err;
+ }
+ return 0;
+}
+
+static void mmapper_exit(void)
+{
+ misc_deregister(&mmapper_dev);
+}
+
+module_init(mmapper_init);
+module_exit(mmapper_exit);
+
+MODULE_AUTHOR("Greg Lonnon <glonnon@ridgerun.com>");
+MODULE_DESCRIPTION("DSPLinux simulator mmapper driver");
+MODULE_LICENSE("GPL");
diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
new file mode 100644
index 0000000..3ef1b48
--- /dev/null
+++ b/arch/um/drivers/net_kern.c
@@ -0,0 +1,903 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ * Licensed under the GPL.
+ */
+
+#include <linux/bootmem.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/inetdevice.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <init.h>
+#include <irq_kern.h>
+#include <irq_user.h>
+#include "mconsole_kern.h"
+#include <net_kern.h>
+#include <net_user.h>
+
+#define DRIVER_NAME "uml-netdev"
+
+static DEFINE_SPINLOCK(opened_lock);
+static LIST_HEAD(opened);
+
+/*
+ * The drop_skb is used when we can't allocate an skb. The
+ * packet is read into drop_skb in order to get the data off the
+ * connection to the host.
+ * It is reallocated whenever a maximum packet size is seen which is
+ * larger than any seen before. update_drop_skb is called from
+ * eth_configure when a new interface is added.
+ */
+static DEFINE_SPINLOCK(drop_lock);
+static struct sk_buff *drop_skb;
+static int drop_max;
+
+static int update_drop_skb(int max)
+{
+ struct sk_buff *new;
+ unsigned long flags;
+ int err = 0;
+
+ spin_lock_irqsave(&drop_lock, flags);
+
+ if (max <= drop_max)
+ goto out;
+
+ err = -ENOMEM;
+ new = dev_alloc_skb(max);
+ if (new == NULL)
+ goto out;
+
+ skb_put(new, max);
+
+ kfree_skb(drop_skb);
+ drop_skb = new;
+ drop_max = max;
+ err = 0;
+out:
+ spin_unlock_irqrestore(&drop_lock, flags);
+
+ return err;
+}
+
+static int uml_net_rx(struct net_device *dev)
+{
+ struct uml_net_private *lp = netdev_priv(dev);
+ int pkt_len;
+ struct sk_buff *skb;
+
+ /* If we can't allocate memory, try again next round. */
+ skb = dev_alloc_skb(lp->max_packet);
+ if (skb == NULL) {
+ drop_skb->dev = dev;
+ /* Read a packet into drop_skb and don't do anything with it. */
+ (*lp->read)(lp->fd, drop_skb, lp);
+ dev->stats.rx_dropped++;
+ return 0;
+ }
+
+ skb->dev = dev;
+ skb_put(skb, lp->max_packet);
+ skb_reset_mac_header(skb);
+ pkt_len = (*lp->read)(lp->fd, skb, lp);
+
+ if (pkt_len > 0) {
+ skb_trim(skb, pkt_len);
+ skb->protocol = (*lp->protocol)(skb);
+
+ dev->stats.rx_bytes += skb->len;
+ dev->stats.rx_packets++;
+ netif_rx(skb);
+ return pkt_len;
+ }
+
+ kfree_skb(skb);
+ return pkt_len;
+}
+
+static void uml_dev_close(struct work_struct *work)
+{
+ struct uml_net_private *lp =
+ container_of(work, struct uml_net_private, work);
+ dev_close(lp->dev);
+}
+
+static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct uml_net_private *lp = netdev_priv(dev);
+ int err;
+
+ if (!netif_running(dev))
+ return IRQ_NONE;
+
+ spin_lock(&lp->lock);
+ while ((err = uml_net_rx(dev)) > 0) ;
+ if (err < 0) {
+ printk(KERN_ERR
+ "Device '%s' read returned %d, shutting it down\n",
+ dev->name, err);
+ /* dev_close can't be called in interrupt context, and takes
+ * again lp->lock.
+ * And dev_close() can be safely called multiple times on the
+ * same device, since it tests for (dev->flags & IFF_UP). So
+ * there's no harm in delaying the device shutdown.
+ * Furthermore, the workqueue will not re-enqueue an already
+ * enqueued work item. */
+ schedule_work(&lp->work);
+ goto out;
+ }
+ reactivate_fd(lp->fd, UM_ETH_IRQ);
+
+out:
+ spin_unlock(&lp->lock);
+ return IRQ_HANDLED;
+}
+
+static int uml_net_open(struct net_device *dev)
+{
+ struct uml_net_private *lp = netdev_priv(dev);
+ int err;
+
+ if (lp->fd >= 0) {
+ err = -ENXIO;
+ goto out;
+ }
+
+ lp->fd = (*lp->open)(&lp->user);
+ if (lp->fd < 0) {
+ err = lp->fd;
+ goto out;
+ }
+
+ err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
+ IRQF_SHARED, dev->name, dev);
+ if (err != 0) {
+ printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
+ err = -ENETUNREACH;
+ goto out_close;
+ }
+
+ netif_start_queue(dev);
+
+ /* clear buffer - it can happen that the host side of the interface
+ * is full when we get here. In this case, new data is never queued,
+ * SIGIOs never arrive, and the net never works.
+ */
+ while ((err = uml_net_rx(dev)) > 0) ;
+
+ spin_lock(&opened_lock);
+ list_add(&lp->list, &opened);
+ spin_unlock(&opened_lock);
+
+ return 0;
+out_close:
+ if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
+ lp->fd = -1;
+out:
+ return err;
+}
+
+static int uml_net_close(struct net_device *dev)
+{
+ struct uml_net_private *lp = netdev_priv(dev);
+
+ netif_stop_queue(dev);
+
+ um_free_irq(dev->irq, dev);
+ if (lp->close != NULL)
+ (*lp->close)(lp->fd, &lp->user);
+ lp->fd = -1;
+
+ spin_lock(&opened_lock);
+ list_del(&lp->list);
+ spin_unlock(&opened_lock);
+
+ return 0;
+}
+
+static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct uml_net_private *lp = netdev_priv(dev);
+ unsigned long flags;
+ int len;
+
+ netif_stop_queue(dev);
+
+ spin_lock_irqsave(&lp->lock, flags);
+
+ len = (*lp->write)(lp->fd, skb, lp);
+ skb_tx_timestamp(skb);
+
+ if (len == skb->len) {
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += skb->len;
+ netif_trans_update(dev);
+ netif_start_queue(dev);
+
+ /* this is normally done in the interrupt when tx finishes */
+ netif_wake_queue(dev);
+ }
+ else if (len == 0) {
+ netif_start_queue(dev);
+ dev->stats.tx_dropped++;
+ }
+ else {
+ netif_start_queue(dev);
+ printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
+ }
+
+ spin_unlock_irqrestore(&lp->lock, flags);
+
+ dev_consume_skb_any(skb);
+
+ return NETDEV_TX_OK;
+}
+
+static void uml_net_set_multicast_list(struct net_device *dev)
+{
+ return;
+}
+
+static void uml_net_tx_timeout(struct net_device *dev)
+{
+ netif_trans_update(dev);
+ netif_wake_queue(dev);
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void uml_net_poll_controller(struct net_device *dev)
+{
+ disable_irq(dev->irq);
+ uml_net_interrupt(dev->irq, dev);
+ enable_irq(dev->irq);
+}
+#endif
+
+static void uml_net_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *info)
+{
+ strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
+ strlcpy(info->version, "42", sizeof(info->version));
+}
+
+static const struct ethtool_ops uml_net_ethtool_ops = {
+ .get_drvinfo = uml_net_get_drvinfo,
+ .get_link = ethtool_op_get_link,
+ .get_ts_info = ethtool_op_get_ts_info,
+};
+
+static void uml_net_user_timer_expire(struct timer_list *t)
+{
+#ifdef undef
+ struct uml_net_private *lp = from_timer(lp, t, tl);
+ struct connection *conn = &lp->user;
+
+ dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
+ do_connect(conn);
+#endif
+}
+
+void uml_net_setup_etheraddr(struct net_device *dev, char *str)
+{
+ unsigned char *addr = dev->dev_addr;
+ char *end;
+ int i;
+
+ if (str == NULL)
+ goto random;
+
+ for (i = 0; i < 6; i++) {
+ addr[i] = simple_strtoul(str, &end, 16);
+ if ((end == str) ||
+ ((*end != ':') && (*end != ',') && (*end != '\0'))) {
+ printk(KERN_ERR
+ "setup_etheraddr: failed to parse '%s' "
+ "as an ethernet address\n", str);
+ goto random;
+ }
+ str = end + 1;
+ }
+ if (is_multicast_ether_addr(addr)) {
+ printk(KERN_ERR
+ "Attempt to assign a multicast ethernet address to a "
+ "device disallowed\n");
+ goto random;
+ }
+ if (!is_valid_ether_addr(addr)) {
+ printk(KERN_ERR
+ "Attempt to assign an invalid ethernet address to a "
+ "device disallowed\n");
+ goto random;
+ }
+ if (!is_local_ether_addr(addr)) {
+ printk(KERN_WARNING
+ "Warning: Assigning a globally valid ethernet "
+ "address to a device\n");
+ printk(KERN_WARNING "You should set the 2nd rightmost bit in "
+ "the first byte of the MAC,\n");
+ printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
+ addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
+ addr[5]);
+ }
+ return;
+
+random:
+ printk(KERN_INFO
+ "Choosing a random ethernet address for device %s\n", dev->name);
+ eth_hw_addr_random(dev);
+}
+
+static DEFINE_SPINLOCK(devices_lock);
+static LIST_HEAD(devices);
+
+static struct platform_driver uml_net_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+};
+
+static void net_device_release(struct device *dev)
+{
+ struct uml_net *device = dev_get_drvdata(dev);
+ struct net_device *netdev = device->dev;
+ struct uml_net_private *lp = netdev_priv(netdev);
+
+ if (lp->remove != NULL)
+ (*lp->remove)(&lp->user);
+ list_del(&device->list);
+ kfree(device);
+ free_netdev(netdev);
+}
+
+static const struct net_device_ops uml_netdev_ops = {
+ .ndo_open = uml_net_open,
+ .ndo_stop = uml_net_close,
+ .ndo_start_xmit = uml_net_start_xmit,
+ .ndo_set_rx_mode = uml_net_set_multicast_list,
+ .ndo_tx_timeout = uml_net_tx_timeout,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_validate_addr = eth_validate_addr,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = uml_net_poll_controller,
+#endif
+};
+
+/*
+ * Ensures that platform_driver_register is called only once by
+ * eth_configure. Will be set in an initcall.
+ */
+static int driver_registered;
+
+static void eth_configure(int n, void *init, char *mac,
+ struct transport *transport, gfp_t gfp_mask)
+{
+ struct uml_net *device;
+ struct net_device *dev;
+ struct uml_net_private *lp;
+ int err, size;
+
+ size = transport->private_size + sizeof(struct uml_net_private);
+
+ device = kzalloc(sizeof(*device), gfp_mask);
+ if (device == NULL) {
+ printk(KERN_ERR "eth_configure failed to allocate struct "
+ "uml_net\n");
+ return;
+ }
+
+ dev = alloc_etherdev(size);
+ if (dev == NULL) {
+ printk(KERN_ERR "eth_configure: failed to allocate struct "
+ "net_device for eth%d\n", n);
+ goto out_free_device;
+ }
+
+ INIT_LIST_HEAD(&device->list);
+ device->index = n;
+
+ /* If this name ends up conflicting with an existing registered
+ * netdevice, that is OK, register_netdev{,ice}() will notice this
+ * and fail.
+ */
+ snprintf(dev->name, sizeof(dev->name), "eth%d", n);
+
+ uml_net_setup_etheraddr(dev, mac);
+
+ printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
+
+ lp = netdev_priv(dev);
+ /* This points to the transport private data. It's still clear, but we
+ * must memset it to 0 *now*. Let's help the drivers. */
+ memset(lp, 0, size);
+ INIT_WORK(&lp->work, uml_dev_close);
+
+ /* sysfs register */
+ if (!driver_registered) {
+ platform_driver_register(¨_net_driver);
+ driver_registered = 1;
+ }
+ device->pdev.id = n;
+ device->pdev.name = DRIVER_NAME;
+ device->pdev.dev.release = net_device_release;
+ dev_set_drvdata(&device->pdev.dev, device);
+ if (platform_device_register(&device->pdev))
+ goto out_free_netdev;
+ SET_NETDEV_DEV(dev,&device->pdev.dev);
+
+ device->dev = dev;
+
+ /*
+ * These just fill in a data structure, so there's no failure
+ * to be worried about.
+ */
+ (*transport->kern->init)(dev, init);
+
+ *lp = ((struct uml_net_private)
+ { .list = LIST_HEAD_INIT(lp->list),
+ .dev = dev,
+ .fd = -1,
+ .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
+ .max_packet = transport->user->max_packet,
+ .protocol = transport->kern->protocol,
+ .open = transport->user->open,
+ .close = transport->user->close,
+ .remove = transport->user->remove,
+ .read = transport->kern->read,
+ .write = transport->kern->write,
+ .add_address = transport->user->add_address,
+ .delete_address = transport->user->delete_address });
+
+ timer_setup(&lp->tl, uml_net_user_timer_expire, 0);
+ spin_lock_init(&lp->lock);
+ memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac));
+
+ if ((transport->user->init != NULL) &&
+ ((*transport->user->init)(&lp->user, dev) != 0))
+ goto out_unregister;
+
+ dev->mtu = transport->user->mtu;
+ dev->netdev_ops = ¨_netdev_ops;
+ dev->ethtool_ops = ¨_net_ethtool_ops;
+ dev->watchdog_timeo = (HZ >> 1);
+ dev->irq = UM_ETH_IRQ;
+
+ err = update_drop_skb(lp->max_packet);
+ if (err)
+ goto out_undo_user_init;
+
+ rtnl_lock();
+ err = register_netdevice(dev);
+ rtnl_unlock();
+ if (err)
+ goto out_undo_user_init;
+
+ spin_lock(&devices_lock);
+ list_add(&device->list, &devices);
+ spin_unlock(&devices_lock);
+
+ return;
+
+out_undo_user_init:
+ if (transport->user->remove != NULL)
+ (*transport->user->remove)(&lp->user);
+out_unregister:
+ platform_device_unregister(&device->pdev);
+ return; /* platform_device_unregister frees dev and device */
+out_free_netdev:
+ free_netdev(dev);
+out_free_device:
+ kfree(device);
+}
+
+static struct uml_net *find_device(int n)
+{
+ struct uml_net *device;
+ struct list_head *ele;
+
+ spin_lock(&devices_lock);
+ list_for_each(ele, &devices) {
+ device = list_entry(ele, struct uml_net, list);
+ if (device->index == n)
+ goto out;
+ }
+ device = NULL;
+ out:
+ spin_unlock(&devices_lock);
+ return device;
+}
+
+static int eth_parse(char *str, int *index_out, char **str_out,
+ char **error_out)
+{
+ char *end;
+ int n, err = -EINVAL;
+
+ n = simple_strtoul(str, &end, 0);
+ if (end == str) {
+ *error_out = "Bad device number";
+ return err;
+ }
+
+ str = end;
+ if (*str != '=') {
+ *error_out = "Expected '=' after device number";
+ return err;
+ }
+
+ str++;
+ if (find_device(n)) {
+ *error_out = "Device already configured";
+ return err;
+ }
+
+ *index_out = n;
+ *str_out = str;
+ return 0;
+}
+
+struct eth_init {
+ struct list_head list;
+ char *init;
+ int index;
+};
+
+static DEFINE_SPINLOCK(transports_lock);
+static LIST_HEAD(transports);
+
+/* Filled in during early boot */
+static LIST_HEAD(eth_cmd_line);
+
+static int check_transport(struct transport *transport, char *eth, int n,
+ void **init_out, char **mac_out, gfp_t gfp_mask)
+{
+ int len;
+
+ len = strlen(transport->name);
+ if (strncmp(eth, transport->name, len))
+ return 0;
+
+ eth += len;
+ if (*eth == ',')
+ eth++;
+ else if (*eth != '\0')
+ return 0;
+
+ *init_out = kmalloc(transport->setup_size, gfp_mask);
+ if (*init_out == NULL)
+ return 1;
+
+ if (!transport->setup(eth, mac_out, *init_out)) {
+ kfree(*init_out);
+ *init_out = NULL;
+ }
+ return 1;
+}
+
+void register_transport(struct transport *new)
+{
+ struct list_head *ele, *next;
+ struct eth_init *eth;
+ void *init;
+ char *mac = NULL;
+ int match;
+
+ spin_lock(&transports_lock);
+ BUG_ON(!list_empty(&new->list));
+ list_add(&new->list, &transports);
+ spin_unlock(&transports_lock);
+
+ list_for_each_safe(ele, next, ð_cmd_line) {
+ eth = list_entry(ele, struct eth_init, list);
+ match = check_transport(new, eth->init, eth->index, &init,
+ &mac, GFP_KERNEL);
+ if (!match)
+ continue;
+ else if (init != NULL) {
+ eth_configure(eth->index, init, mac, new, GFP_KERNEL);
+ kfree(init);
+ }
+ list_del(ð->list);
+ }
+}
+
+static int eth_setup_common(char *str, int index)
+{
+ struct list_head *ele;
+ struct transport *transport;
+ void *init;
+ char *mac = NULL;
+ int found = 0;
+
+ spin_lock(&transports_lock);
+ list_for_each(ele, &transports) {
+ transport = list_entry(ele, struct transport, list);
+ if (!check_transport(transport, str, index, &init,
+ &mac, GFP_ATOMIC))
+ continue;
+ if (init != NULL) {
+ eth_configure(index, init, mac, transport, GFP_ATOMIC);
+ kfree(init);
+ }
+ found = 1;
+ break;
+ }
+
+ spin_unlock(&transports_lock);
+ return found;
+}
+
+static int __init eth_setup(char *str)
+{
+ struct eth_init *new;
+ char *error;
+ int n, err;
+
+ err = eth_parse(str, &n, &str, &error);
+ if (err) {
+ printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
+ str, error);
+ return 1;
+ }
+
+ new = alloc_bootmem(sizeof(*new));
+
+ INIT_LIST_HEAD(&new->list);
+ new->index = n;
+ new->init = str;
+
+ list_add_tail(&new->list, ð_cmd_line);
+ return 1;
+}
+
+__setup("eth", eth_setup);
+__uml_help(eth_setup,
+"eth[0-9]+=<transport>,<options>\n"
+" Configure a network device.\n\n"
+);
+
+static int net_config(char *str, char **error_out)
+{
+ int n, err;
+
+ err = eth_parse(str, &n, &str, error_out);
+ if (err)
+ return err;
+
+ /* This string is broken up and the pieces used by the underlying
+ * driver. So, it is freed only if eth_setup_common fails.
+ */
+ str = kstrdup(str, GFP_KERNEL);
+ if (str == NULL) {
+ *error_out = "net_config failed to strdup string";
+ return -ENOMEM;
+ }
+ err = !eth_setup_common(str, n);
+ if (err)
+ kfree(str);
+ return err;
+}
+
+static int net_id(char **str, int *start_out, int *end_out)
+{
+ char *end;
+ int n;
+
+ n = simple_strtoul(*str, &end, 0);
+ if ((*end != '\0') || (end == *str))
+ return -1;
+
+ *start_out = n;
+ *end_out = n;
+ *str = end;
+ return n;
+}
+
+static int net_remove(int n, char **error_out)
+{
+ struct uml_net *device;
+ struct net_device *dev;
+ struct uml_net_private *lp;
+
+ device = find_device(n);
+ if (device == NULL)
+ return -ENODEV;
+
+ dev = device->dev;
+ lp = netdev_priv(dev);
+ if (lp->fd > 0)
+ return -EBUSY;
+ unregister_netdev(dev);
+ platform_device_unregister(&device->pdev);
+
+ return 0;
+}
+
+static struct mc_device net_mc = {
+ .list = LIST_HEAD_INIT(net_mc.list),
+ .name = "eth",
+ .config = net_config,
+ .get_config = NULL,
+ .id = net_id,
+ .remove = net_remove,
+};
+
+#ifdef CONFIG_INET
+static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct in_ifaddr *ifa = ptr;
+ struct net_device *dev = ifa->ifa_dev->dev;
+ struct uml_net_private *lp;
+ void (*proc)(unsigned char *, unsigned char *, void *);
+ unsigned char addr_buf[4], netmask_buf[4];
+
+ if (dev->netdev_ops->ndo_open != uml_net_open)
+ return NOTIFY_DONE;
+
+ lp = netdev_priv(dev);
+
+ proc = NULL;
+ switch (event) {
+ case NETDEV_UP:
+ proc = lp->add_address;
+ break;
+ case NETDEV_DOWN:
+ proc = lp->delete_address;
+ break;
+ }
+ if (proc != NULL) {
+ memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
+ memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
+ (*proc)(addr_buf, netmask_buf, &lp->user);
+ }
+ return NOTIFY_DONE;
+}
+
+/* uml_net_init shouldn't be called twice on two CPUs at the same time */
+static struct notifier_block uml_inetaddr_notifier = {
+ .notifier_call = uml_inetaddr_event,
+};
+
+static void inet_register(void)
+{
+ struct list_head *ele;
+ struct uml_net_private *lp;
+ struct in_device *ip;
+ struct in_ifaddr *in;
+
+ register_inetaddr_notifier(¨_inetaddr_notifier);
+
+ /* Devices may have been opened already, so the uml_inetaddr_notifier
+ * didn't get a chance to run for them. This fakes it so that
+ * addresses which have already been set up get handled properly.
+ */
+ spin_lock(&opened_lock);
+ list_for_each(ele, &opened) {
+ lp = list_entry(ele, struct uml_net_private, list);
+ ip = lp->dev->ip_ptr;
+ if (ip == NULL)
+ continue;
+ in = ip->ifa_list;
+ while (in != NULL) {
+ uml_inetaddr_event(NULL, NETDEV_UP, in);
+ in = in->ifa_next;
+ }
+ }
+ spin_unlock(&opened_lock);
+}
+#else
+static inline void inet_register(void)
+{
+}
+#endif
+
+static int uml_net_init(void)
+{
+ mconsole_register_dev(&net_mc);
+ inet_register();
+ return 0;
+}
+
+__initcall(uml_net_init);
+
+static void close_devices(void)
+{
+ struct list_head *ele;
+ struct uml_net_private *lp;
+
+ spin_lock(&opened_lock);
+ list_for_each(ele, &opened) {
+ lp = list_entry(ele, struct uml_net_private, list);
+ um_free_irq(lp->dev->irq, lp->dev);
+ if ((lp->close != NULL) && (lp->fd >= 0))
+ (*lp->close)(lp->fd, &lp->user);
+ if (lp->remove != NULL)
+ (*lp->remove)(&lp->user);
+ }
+ spin_unlock(&opened_lock);
+}
+
+__uml_exitcall(close_devices);
+
+void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
+ void *),
+ void *arg)
+{
+ struct net_device *dev = d;
+ struct in_device *ip = dev->ip_ptr;
+ struct in_ifaddr *in;
+ unsigned char address[4], netmask[4];
+
+ if (ip == NULL) return;
+ in = ip->ifa_list;
+ while (in != NULL) {
+ memcpy(address, &in->ifa_address, sizeof(address));
+ memcpy(netmask, &in->ifa_mask, sizeof(netmask));
+ (*cb)(address, netmask, arg);
+ in = in->ifa_next;
+ }
+}
+
+int dev_netmask(void *d, void *m)
+{
+ struct net_device *dev = d;
+ struct in_device *ip = dev->ip_ptr;
+ struct in_ifaddr *in;
+ __be32 *mask_out = m;
+
+ if (ip == NULL)
+ return 1;
+
+ in = ip->ifa_list;
+ if (in == NULL)
+ return 1;
+
+ *mask_out = in->ifa_mask;
+ return 0;
+}
+
+void *get_output_buffer(int *len_out)
+{
+ void *ret;
+
+ ret = (void *) __get_free_pages(GFP_KERNEL, 0);
+ if (ret) *len_out = PAGE_SIZE;
+ else *len_out = 0;
+ return ret;
+}
+
+void free_output_buffer(void *buffer)
+{
+ free_pages((unsigned long) buffer, 0);
+}
+
+int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
+ char **gate_addr)
+{
+ char *remain;
+
+ remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
+ if (remain != NULL) {
+ printk(KERN_ERR "tap_setup_common - Extra garbage on "
+ "specification : '%s'\n", remain);
+ return 1;
+ }
+
+ return 0;
+}
+
+unsigned short eth_protocol(struct sk_buff *skb)
+{
+ return eth_type_trans(skb, skb->dev);
+}
diff --git a/arch/um/drivers/net_user.c b/arch/um/drivers/net_user.c
new file mode 100644
index 0000000..e9f8445
--- /dev/null
+++ b/arch/um/drivers/net_user.c
@@ -0,0 +1,271 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <stddef.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <net_user.h>
+#include <os.h>
+#include <um_malloc.h>
+
+int tap_open_common(void *dev, char *gate_addr)
+{
+ int tap_addr[4];
+
+ if (gate_addr == NULL)
+ return 0;
+ if (sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0],
+ &tap_addr[1], &tap_addr[2], &tap_addr[3]) != 4) {
+ printk(UM_KERN_ERR "Invalid tap IP address - '%s'\n",
+ gate_addr);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+void tap_check_ips(char *gate_addr, unsigned char *eth_addr)
+{
+ int tap_addr[4];
+
+ if ((gate_addr != NULL) &&
+ (sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0],
+ &tap_addr[1], &tap_addr[2], &tap_addr[3]) == 4) &&
+ (eth_addr[0] == tap_addr[0]) &&
+ (eth_addr[1] == tap_addr[1]) &&
+ (eth_addr[2] == tap_addr[2]) &&
+ (eth_addr[3] == tap_addr[3])) {
+ printk(UM_KERN_ERR "The tap IP address and the UML eth IP "
+ "address must be different\n");
+ }
+}
+
+/* Do reliable error handling as this fails frequently enough. */
+void read_output(int fd, char *output, int len)
+{
+ int remain, ret, expected;
+ char c;
+ char *str;
+
+ if (output == NULL) {
+ output = &c;
+ len = sizeof(c);
+ }
+
+ *output = '\0';
+ ret = read(fd, &remain, sizeof(remain));
+
+ if (ret != sizeof(remain)) {
+ if (ret < 0)
+ ret = -errno;
+ expected = sizeof(remain);
+ str = "length";
+ goto err;
+ }
+
+ while (remain != 0) {
+ expected = (remain < len) ? remain : len;
+ ret = read(fd, output, expected);
+ if (ret != expected) {
+ if (ret < 0)
+ ret = -errno;
+ str = "data";
+ goto err;
+ }
+ remain -= ret;
+ }
+
+ return;
+
+err:
+ if (ret < 0)
+ printk(UM_KERN_ERR "read_output - read of %s failed, "
+ "errno = %d\n", str, -ret);
+ else
+ printk(UM_KERN_ERR "read_output - read of %s failed, read only "
+ "%d of %d bytes\n", str, ret, expected);
+}
+
+int net_read(int fd, void *buf, int len)
+{
+ int n;
+
+ n = read(fd, buf, len);
+
+ if ((n < 0) && (errno == EAGAIN))
+ return 0;
+ else if (n == 0)
+ return -ENOTCONN;
+ return n;
+}
+
+int net_recvfrom(int fd, void *buf, int len)
+{
+ int n;
+
+ CATCH_EINTR(n = recvfrom(fd, buf, len, 0, NULL, NULL));
+ if (n < 0) {
+ if (errno == EAGAIN)
+ return 0;
+ return -errno;
+ }
+ else if (n == 0)
+ return -ENOTCONN;
+ return n;
+}
+
+int net_write(int fd, void *buf, int len)
+{
+ int n;
+
+ n = write(fd, buf, len);
+
+ if ((n < 0) && (errno == EAGAIN))
+ return 0;
+ else if (n == 0)
+ return -ENOTCONN;
+ return n;
+}
+
+int net_send(int fd, void *buf, int len)
+{
+ int n;
+
+ CATCH_EINTR(n = send(fd, buf, len, 0));
+ if (n < 0) {
+ if (errno == EAGAIN)
+ return 0;
+ return -errno;
+ }
+ else if (n == 0)
+ return -ENOTCONN;
+ return n;
+}
+
+int net_sendto(int fd, void *buf, int len, void *to, int sock_len)
+{
+ int n;
+
+ CATCH_EINTR(n = sendto(fd, buf, len, 0, (struct sockaddr *) to,
+ sock_len));
+ if (n < 0) {
+ if (errno == EAGAIN)
+ return 0;
+ return -errno;
+ }
+ else if (n == 0)
+ return -ENOTCONN;
+ return n;
+}
+
+struct change_pre_exec_data {
+ int close_me;
+ int stdout_fd;
+};
+
+static void change_pre_exec(void *arg)
+{
+ struct change_pre_exec_data *data = arg;
+
+ close(data->close_me);
+ dup2(data->stdout_fd, 1);
+}
+
+static int change_tramp(char **argv, char *output, int output_len)
+{
+ int pid, fds[2], err;
+ struct change_pre_exec_data pe_data;
+
+ err = os_pipe(fds, 1, 0);
+ if (err < 0) {
+ printk(UM_KERN_ERR "change_tramp - pipe failed, err = %d\n",
+ -err);
+ return err;
+ }
+ pe_data.close_me = fds[0];
+ pe_data.stdout_fd = fds[1];
+ pid = run_helper(change_pre_exec, &pe_data, argv);
+
+ if (pid > 0) /* Avoid hang as we won't get data in failure case. */
+ read_output(fds[0], output, output_len);
+
+ close(fds[0]);
+ close(fds[1]);
+
+ if (pid > 0)
+ helper_wait(pid);
+ return pid;
+}
+
+static void change(char *dev, char *what, unsigned char *addr,
+ unsigned char *netmask)
+{
+ char addr_buf[sizeof("255.255.255.255\0")];
+ char netmask_buf[sizeof("255.255.255.255\0")];
+ char version[sizeof("nnnnn\0")];
+ char *argv[] = { "uml_net", version, what, dev, addr_buf,
+ netmask_buf, NULL };
+ char *output;
+ int output_len, pid;
+
+ sprintf(version, "%d", UML_NET_VERSION);
+ sprintf(addr_buf, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
+ sprintf(netmask_buf, "%d.%d.%d.%d", netmask[0], netmask[1],
+ netmask[2], netmask[3]);
+
+ output_len = UM_KERN_PAGE_SIZE;
+ output = uml_kmalloc(output_len, UM_GFP_KERNEL);
+ if (output == NULL)
+ printk(UM_KERN_ERR "change : failed to allocate output "
+ "buffer\n");
+
+ pid = change_tramp(argv, output, output_len);
+ if (pid < 0) {
+ kfree(output);
+ return;
+ }
+
+ if (output != NULL) {
+ printk("%s", output);
+ kfree(output);
+ }
+}
+
+void open_addr(unsigned char *addr, unsigned char *netmask, void *arg)
+{
+ change(arg, "add", addr, netmask);
+}
+
+void close_addr(unsigned char *addr, unsigned char *netmask, void *arg)
+{
+ change(arg, "del", addr, netmask);
+}
+
+char *split_if_spec(char *str, ...)
+{
+ char **arg, *end, *ret = NULL;
+ va_list ap;
+
+ va_start(ap, str);
+ while ((arg = va_arg(ap, char **)) != NULL) {
+ if (*str == '\0')
+ goto out;
+ end = strchr(str, ',');
+ if (end != str)
+ *arg = str;
+ if (end == NULL)
+ goto out;
+ *end++ = '\0';
+ str = end;
+ }
+ ret = str;
+out:
+ va_end(ap);
+ return ret;
+}
diff --git a/arch/um/drivers/null.c b/arch/um/drivers/null.c
new file mode 100644
index 0000000..1049574
--- /dev/null
+++ b/arch/um/drivers/null.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <stddef.h>
+#include <errno.h>
+#include <fcntl.h>
+#include "chan_user.h"
+#include <os.h>
+
+/* This address is used only as a unique identifier */
+static int null_chan;
+
+static void *null_init(char *str, int device, const struct chan_opts *opts)
+{
+ return &null_chan;
+}
+
+static int null_open(int input, int output, int primary, void *d,
+ char **dev_out)
+{
+ int fd;
+
+ *dev_out = NULL;
+
+ fd = open(DEV_NULL, O_RDWR);
+ return (fd < 0) ? -errno : fd;
+}
+
+static int null_read(int fd, char *c_out, void *unused)
+{
+ return -ENODEV;
+}
+
+static void null_free(void *data)
+{
+}
+
+const struct chan_ops null_ops = {
+ .type = "null",
+ .init = null_init,
+ .open = null_open,
+ .close = generic_close,
+ .read = null_read,
+ .write = generic_write,
+ .console_write = generic_console_write,
+ .window_size = generic_window_size,
+ .free = null_free,
+ .winch = 0,
+};
diff --git a/arch/um/drivers/pcap_kern.c b/arch/um/drivers/pcap_kern.c
new file mode 100644
index 0000000..be0fb57
--- /dev/null
+++ b/arch/um/drivers/pcap_kern.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <net_kern.h>
+#include "pcap_user.h"
+
+struct pcap_init {
+ char *host_if;
+ int promisc;
+ int optimize;
+ char *filter;
+};
+
+void pcap_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *pri;
+ struct pcap_data *ppri;
+ struct pcap_init *init = data;
+
+ pri = netdev_priv(dev);
+ ppri = (struct pcap_data *) pri->user;
+ ppri->host_if = init->host_if;
+ ppri->promisc = init->promisc;
+ ppri->optimize = init->optimize;
+ ppri->filter = init->filter;
+
+ printk("pcap backend, host interface %s\n", ppri->host_if);
+}
+
+static int pcap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return pcap_user_read(fd, skb_mac_header(skb),
+ skb->dev->mtu + ETH_HEADER_OTHER,
+ (struct pcap_data *) &lp->user);
+}
+
+static int pcap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return -EPERM;
+}
+
+static const struct net_kern_info pcap_kern_info = {
+ .init = pcap_init,
+ .protocol = eth_protocol,
+ .read = pcap_read,
+ .write = pcap_write,
+};
+
+int pcap_setup(char *str, char **mac_out, void *data)
+{
+ struct pcap_init *init = data;
+ char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
+ int i;
+
+ *init = ((struct pcap_init)
+ { .host_if = "eth0",
+ .promisc = 1,
+ .optimize = 0,
+ .filter = NULL });
+
+ remain = split_if_spec(str, &host_if, &init->filter,
+ &options[0], &options[1], mac_out, NULL);
+ if (remain != NULL) {
+ printk(KERN_ERR "pcap_setup - Extra garbage on "
+ "specification : '%s'\n", remain);
+ return 0;
+ }
+
+ if (host_if != NULL)
+ init->host_if = host_if;
+
+ for (i = 0; i < ARRAY_SIZE(options); i++) {
+ if (options[i] == NULL)
+ continue;
+ if (!strcmp(options[i], "promisc"))
+ init->promisc = 1;
+ else if (!strcmp(options[i], "nopromisc"))
+ init->promisc = 0;
+ else if (!strcmp(options[i], "optimize"))
+ init->optimize = 1;
+ else if (!strcmp(options[i], "nooptimize"))
+ init->optimize = 0;
+ else {
+ printk(KERN_ERR "pcap_setup : bad option - '%s'\n",
+ options[i]);
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+static struct transport pcap_transport = {
+ .list = LIST_HEAD_INIT(pcap_transport.list),
+ .name = "pcap",
+ .setup = pcap_setup,
+ .user = &pcap_user_info,
+ .kern = &pcap_kern_info,
+ .private_size = sizeof(struct pcap_data),
+ .setup_size = sizeof(struct pcap_init),
+};
+
+static int register_pcap(void)
+{
+ register_transport(&pcap_transport);
+ return 0;
+}
+
+late_initcall(register_pcap);
diff --git a/arch/um/drivers/pcap_user.c b/arch/um/drivers/pcap_user.c
new file mode 100644
index 0000000..c07b9c7
--- /dev/null
+++ b/arch/um/drivers/pcap_user.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <errno.h>
+#include <pcap.h>
+#include <string.h>
+#include <asm/types.h>
+#include <net_user.h>
+#include "pcap_user.h"
+#include <um_malloc.h>
+
+#define PCAP_FD(p) (*(int *)(p))
+
+static int pcap_user_init(void *data, void *dev)
+{
+ struct pcap_data *pri = data;
+ pcap_t *p;
+ char errors[PCAP_ERRBUF_SIZE];
+
+ p = pcap_open_live(pri->host_if, ETH_MAX_PACKET + ETH_HEADER_OTHER,
+ pri->promisc, 0, errors);
+ if (p == NULL) {
+ printk(UM_KERN_ERR "pcap_user_init : pcap_open_live failed - "
+ "'%s'\n", errors);
+ return -EINVAL;
+ }
+
+ pri->dev = dev;
+ pri->pcap = p;
+ return 0;
+}
+
+static int pcap_open(void *data)
+{
+ struct pcap_data *pri = data;
+ __u32 netmask;
+ int err;
+
+ if (pri->pcap == NULL)
+ return -ENODEV;
+
+ if (pri->filter != NULL) {
+ err = dev_netmask(pri->dev, &netmask);
+ if (err < 0) {
+ printk(UM_KERN_ERR "pcap_open : dev_netmask failed\n");
+ return -EIO;
+ }
+
+ pri->compiled = uml_kmalloc(sizeof(struct bpf_program),
+ UM_GFP_KERNEL);
+ if (pri->compiled == NULL) {
+ printk(UM_KERN_ERR "pcap_open : kmalloc failed\n");
+ return -ENOMEM;
+ }
+
+ err = pcap_compile(pri->pcap,
+ (struct bpf_program *) pri->compiled,
+ pri->filter, pri->optimize, netmask);
+ if (err < 0) {
+ printk(UM_KERN_ERR "pcap_open : pcap_compile failed - "
+ "'%s'\n", pcap_geterr(pri->pcap));
+ goto out;
+ }
+
+ err = pcap_setfilter(pri->pcap, pri->compiled);
+ if (err < 0) {
+ printk(UM_KERN_ERR "pcap_open : pcap_setfilter "
+ "failed - '%s'\n", pcap_geterr(pri->pcap));
+ goto out;
+ }
+ }
+
+ return PCAP_FD(pri->pcap);
+
+ out:
+ kfree(pri->compiled);
+ return -EIO;
+}
+
+static void pcap_remove(void *data)
+{
+ struct pcap_data *pri = data;
+
+ if (pri->compiled != NULL)
+ pcap_freecode(pri->compiled);
+
+ if (pri->pcap != NULL)
+ pcap_close(pri->pcap);
+}
+
+struct pcap_handler_data {
+ char *buffer;
+ int len;
+};
+
+static void handler(u_char *data, const struct pcap_pkthdr *header,
+ const u_char *packet)
+{
+ int len;
+
+ struct pcap_handler_data *hdata = (struct pcap_handler_data *) data;
+
+ len = hdata->len < header->caplen ? hdata->len : header->caplen;
+ memcpy(hdata->buffer, packet, len);
+ hdata->len = len;
+}
+
+int pcap_user_read(int fd, void *buffer, int len, struct pcap_data *pri)
+{
+ struct pcap_handler_data hdata = ((struct pcap_handler_data)
+ { .buffer = buffer,
+ .len = len });
+ int n;
+
+ n = pcap_dispatch(pri->pcap, 1, handler, (u_char *) &hdata);
+ if (n < 0) {
+ printk(UM_KERN_ERR "pcap_dispatch failed - %s\n",
+ pcap_geterr(pri->pcap));
+ return -EIO;
+ }
+ else if (n == 0)
+ return 0;
+ return hdata.len;
+}
+
+const struct net_user_info pcap_user_info = {
+ .init = pcap_user_init,
+ .open = pcap_open,
+ .close = NULL,
+ .remove = pcap_remove,
+ .add_address = NULL,
+ .delete_address = NULL,
+ .mtu = ETH_MAX_PACKET,
+ .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
+};
diff --git a/arch/um/drivers/pcap_user.h b/arch/um/drivers/pcap_user.h
new file mode 100644
index 0000000..1ca7c76
--- /dev/null
+++ b/arch/um/drivers/pcap_user.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <net_user.h>
+
+struct pcap_data {
+ char *host_if;
+ int promisc;
+ int optimize;
+ char *filter;
+ void *compiled;
+ void *pcap;
+ void *dev;
+};
+
+extern const struct net_user_info pcap_user_info;
+
+extern int pcap_user_read(int fd, void *buf, int len, struct pcap_data *pri);
+
diff --git a/arch/um/drivers/port.h b/arch/um/drivers/port.h
new file mode 100644
index 0000000..372a80c
--- /dev/null
+++ b/arch/um/drivers/port.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __PORT_H__
+#define __PORT_H__
+
+extern void *port_data(int port);
+extern int port_wait(void *data);
+extern void port_kern_close(void *d);
+extern int port_connection(int fd, int *socket_out, int *pid_out);
+extern int port_listen_fd(int port);
+extern void port_read(int fd, void *data);
+extern void port_kern_free(void *d);
+extern int port_rcv_fd(int fd);
+extern void port_remove_dev(void *d);
+
+#endif
+
diff --git a/arch/um/drivers/port_kern.c b/arch/um/drivers/port_kern.c
new file mode 100644
index 0000000..40ca5cc
--- /dev/null
+++ b/arch/um/drivers/port_kern.c
@@ -0,0 +1,304 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/completion.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <asm/atomic.h>
+#include <init.h>
+#include <irq_kern.h>
+#include <os.h>
+#include "port.h"
+
+struct port_list {
+ struct list_head list;
+ atomic_t wait_count;
+ int has_connection;
+ struct completion done;
+ int port;
+ int fd;
+ spinlock_t lock;
+ struct list_head pending;
+ struct list_head connections;
+};
+
+struct port_dev {
+ struct port_list *port;
+ int helper_pid;
+ int telnetd_pid;
+};
+
+struct connection {
+ struct list_head list;
+ int fd;
+ int helper_pid;
+ int socket[2];
+ int telnetd_pid;
+ struct port_list *port;
+};
+
+static irqreturn_t pipe_interrupt(int irq, void *data)
+{
+ struct connection *conn = data;
+ int fd;
+
+ fd = os_rcv_fd(conn->socket[0], &conn->helper_pid);
+ if (fd < 0) {
+ if (fd == -EAGAIN)
+ return IRQ_NONE;
+
+ printk(KERN_ERR "pipe_interrupt : os_rcv_fd returned %d\n",
+ -fd);
+ os_close_file(conn->fd);
+ }
+
+ list_del(&conn->list);
+
+ conn->fd = fd;
+ list_add(&conn->list, &conn->port->connections);
+
+ complete(&conn->port->done);
+ return IRQ_HANDLED;
+}
+
+#define NO_WAITER_MSG \
+ "****\n" \
+ "There are currently no UML consoles waiting for port connections.\n" \
+ "Either disconnect from one to make it available or activate some more\n" \
+ "by enabling more consoles in the UML /etc/inittab.\n" \
+ "****\n"
+
+static int port_accept(struct port_list *port)
+{
+ struct connection *conn;
+ int fd, socket[2], pid;
+
+ fd = port_connection(port->fd, socket, &pid);
+ if (fd < 0) {
+ if (fd != -EAGAIN)
+ printk(KERN_ERR "port_accept : port_connection "
+ "returned %d\n", -fd);
+ goto out;
+ }
+
+ conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
+ if (conn == NULL) {
+ printk(KERN_ERR "port_accept : failed to allocate "
+ "connection\n");
+ goto out_close;
+ }
+ *conn = ((struct connection)
+ { .list = LIST_HEAD_INIT(conn->list),
+ .fd = fd,
+ .socket = { socket[0], socket[1] },
+ .telnetd_pid = pid,
+ .port = port });
+
+ if (um_request_irq(TELNETD_IRQ, socket[0], IRQ_READ, pipe_interrupt,
+ IRQF_SHARED, "telnetd", conn)) {
+ printk(KERN_ERR "port_accept : failed to get IRQ for "
+ "telnetd\n");
+ goto out_free;
+ }
+
+ if (atomic_read(&port->wait_count) == 0) {
+ os_write_file(fd, NO_WAITER_MSG, sizeof(NO_WAITER_MSG));
+ printk(KERN_ERR "No one waiting for port\n");
+ }
+ list_add(&conn->list, &port->pending);
+ return 1;
+
+ out_free:
+ kfree(conn);
+ out_close:
+ os_close_file(fd);
+ os_kill_process(pid, 1);
+ out:
+ return 0;
+}
+
+static DEFINE_MUTEX(ports_mutex);
+static LIST_HEAD(ports);
+
+static void port_work_proc(struct work_struct *unused)
+{
+ struct port_list *port;
+ struct list_head *ele;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ list_for_each(ele, &ports) {
+ port = list_entry(ele, struct port_list, list);
+ if (!port->has_connection)
+ continue;
+
+ reactivate_fd(port->fd, ACCEPT_IRQ);
+ while (port_accept(port))
+ ;
+ port->has_connection = 0;
+ }
+ local_irq_restore(flags);
+}
+
+DECLARE_WORK(port_work, port_work_proc);
+
+static irqreturn_t port_interrupt(int irq, void *data)
+{
+ struct port_list *port = data;
+
+ port->has_connection = 1;
+ schedule_work(&port_work);
+ return IRQ_HANDLED;
+}
+
+void *port_data(int port_num)
+{
+ struct list_head *ele;
+ struct port_list *port;
+ struct port_dev *dev = NULL;
+ int fd;
+
+ mutex_lock(&ports_mutex);
+ list_for_each(ele, &ports) {
+ port = list_entry(ele, struct port_list, list);
+ if (port->port == port_num)
+ goto found;
+ }
+ port = kmalloc(sizeof(struct port_list), GFP_KERNEL);
+ if (port == NULL) {
+ printk(KERN_ERR "Allocation of port list failed\n");
+ goto out;
+ }
+
+ fd = port_listen_fd(port_num);
+ if (fd < 0) {
+ printk(KERN_ERR "binding to port %d failed, errno = %d\n",
+ port_num, -fd);
+ goto out_free;
+ }
+
+ if (um_request_irq(ACCEPT_IRQ, fd, IRQ_READ, port_interrupt,
+ IRQF_SHARED, "port", port)) {
+ printk(KERN_ERR "Failed to get IRQ for port %d\n", port_num);
+ goto out_close;
+ }
+
+ *port = ((struct port_list)
+ { .list = LIST_HEAD_INIT(port->list),
+ .wait_count = ATOMIC_INIT(0),
+ .has_connection = 0,
+ .port = port_num,
+ .fd = fd,
+ .pending = LIST_HEAD_INIT(port->pending),
+ .connections = LIST_HEAD_INIT(port->connections) });
+ spin_lock_init(&port->lock);
+ init_completion(&port->done);
+ list_add(&port->list, &ports);
+
+ found:
+ dev = kmalloc(sizeof(struct port_dev), GFP_KERNEL);
+ if (dev == NULL) {
+ printk(KERN_ERR "Allocation of port device entry failed\n");
+ goto out;
+ }
+
+ *dev = ((struct port_dev) { .port = port,
+ .helper_pid = -1,
+ .telnetd_pid = -1 });
+ goto out;
+
+ out_close:
+ os_close_file(fd);
+ out_free:
+ kfree(port);
+ out:
+ mutex_unlock(&ports_mutex);
+ return dev;
+}
+
+int port_wait(void *data)
+{
+ struct port_dev *dev = data;
+ struct connection *conn;
+ struct port_list *port = dev->port;
+ int fd;
+
+ atomic_inc(&port->wait_count);
+ while (1) {
+ fd = -ERESTARTSYS;
+ if (wait_for_completion_interruptible(&port->done))
+ goto out;
+
+ spin_lock(&port->lock);
+
+ conn = list_entry(port->connections.next, struct connection,
+ list);
+ list_del(&conn->list);
+ spin_unlock(&port->lock);
+
+ os_shutdown_socket(conn->socket[0], 1, 1);
+ os_close_file(conn->socket[0]);
+ os_shutdown_socket(conn->socket[1], 1, 1);
+ os_close_file(conn->socket[1]);
+
+ /* This is done here because freeing an IRQ can't be done
+ * within the IRQ handler. So, pipe_interrupt always ups
+ * the semaphore regardless of whether it got a successful
+ * connection. Then we loop here throwing out failed
+ * connections until a good one is found.
+ */
+ um_free_irq(TELNETD_IRQ, conn);
+
+ if (conn->fd >= 0)
+ break;
+ os_close_file(conn->fd);
+ kfree(conn);
+ }
+
+ fd = conn->fd;
+ dev->helper_pid = conn->helper_pid;
+ dev->telnetd_pid = conn->telnetd_pid;
+ kfree(conn);
+ out:
+ atomic_dec(&port->wait_count);
+ return fd;
+}
+
+void port_remove_dev(void *d)
+{
+ struct port_dev *dev = d;
+
+ if (dev->helper_pid != -1)
+ os_kill_process(dev->helper_pid, 0);
+ if (dev->telnetd_pid != -1)
+ os_kill_process(dev->telnetd_pid, 1);
+ dev->helper_pid = -1;
+ dev->telnetd_pid = -1;
+}
+
+void port_kern_free(void *d)
+{
+ struct port_dev *dev = d;
+
+ port_remove_dev(dev);
+ kfree(dev);
+}
+
+static void free_port(void)
+{
+ struct list_head *ele;
+ struct port_list *port;
+
+ list_for_each(ele, &ports) {
+ port = list_entry(ele, struct port_list, list);
+ free_irq_by_fd(port->fd);
+ os_close_file(port->fd);
+ }
+}
+
+__uml_exitcall(free_port);
diff --git a/arch/um/drivers/port_user.c b/arch/um/drivers/port_user.c
new file mode 100644
index 0000000..9a8e1b6
--- /dev/null
+++ b/arch/um/drivers/port_user.c
@@ -0,0 +1,201 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <termios.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include "chan_user.h"
+#include <os.h>
+#include "port.h"
+#include <um_malloc.h>
+
+struct port_chan {
+ int raw;
+ struct termios tt;
+ void *kernel_data;
+ char dev[sizeof("32768\0")];
+};
+
+static void *port_init(char *str, int device, const struct chan_opts *opts)
+{
+ struct port_chan *data;
+ void *kern_data;
+ char *end;
+ int port;
+
+ if (*str != ':') {
+ printk(UM_KERN_ERR "port_init : channel type 'port' must "
+ "specify a port number\n");
+ return NULL;
+ }
+ str++;
+ port = strtoul(str, &end, 0);
+ if ((*end != '\0') || (end == str)) {
+ printk(UM_KERN_ERR "port_init : couldn't parse port '%s'\n",
+ str);
+ return NULL;
+ }
+
+ kern_data = port_data(port);
+ if (kern_data == NULL)
+ return NULL;
+
+ data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
+ if (data == NULL)
+ goto err;
+
+ *data = ((struct port_chan) { .raw = opts->raw,
+ .kernel_data = kern_data });
+ sprintf(data->dev, "%d", port);
+
+ return data;
+ err:
+ port_kern_free(kern_data);
+ return NULL;
+}
+
+static void port_free(void *d)
+{
+ struct port_chan *data = d;
+
+ port_kern_free(data->kernel_data);
+ kfree(data);
+}
+
+static int port_open(int input, int output, int primary, void *d,
+ char **dev_out)
+{
+ struct port_chan *data = d;
+ int fd, err;
+
+ fd = port_wait(data->kernel_data);
+ if ((fd >= 0) && data->raw) {
+ CATCH_EINTR(err = tcgetattr(fd, &data->tt));
+ if (err)
+ return err;
+
+ err = raw(fd);
+ if (err)
+ return err;
+ }
+ *dev_out = data->dev;
+ return fd;
+}
+
+static void port_close(int fd, void *d)
+{
+ struct port_chan *data = d;
+
+ port_remove_dev(data->kernel_data);
+ os_close_file(fd);
+}
+
+const struct chan_ops port_ops = {
+ .type = "port",
+ .init = port_init,
+ .open = port_open,
+ .close = port_close,
+ .read = generic_read,
+ .write = generic_write,
+ .console_write = generic_console_write,
+ .window_size = generic_window_size,
+ .free = port_free,
+ .winch = 1,
+};
+
+int port_listen_fd(int port)
+{
+ struct sockaddr_in addr;
+ int fd, err, arg;
+
+ fd = socket(PF_INET, SOCK_STREAM, 0);
+ if (fd == -1)
+ return -errno;
+
+ arg = 1;
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &arg, sizeof(arg)) < 0) {
+ err = -errno;
+ goto out;
+ }
+
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(port);
+ addr.sin_addr.s_addr = htonl(INADDR_ANY);
+ if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+ err = -errno;
+ goto out;
+ }
+
+ if (listen(fd, 1) < 0) {
+ err = -errno;
+ goto out;
+ }
+
+ err = os_set_fd_block(fd, 0);
+ if (err < 0)
+ goto out;
+
+ return fd;
+ out:
+ close(fd);
+ return err;
+}
+
+struct port_pre_exec_data {
+ int sock_fd;
+ int pipe_fd;
+};
+
+static void port_pre_exec(void *arg)
+{
+ struct port_pre_exec_data *data = arg;
+
+ dup2(data->sock_fd, 0);
+ dup2(data->sock_fd, 1);
+ dup2(data->sock_fd, 2);
+ close(data->sock_fd);
+ dup2(data->pipe_fd, 3);
+ shutdown(3, SHUT_RD);
+ close(data->pipe_fd);
+}
+
+int port_connection(int fd, int *socket, int *pid_out)
+{
+ int new, err;
+ char *argv[] = { "/usr/sbin/in.telnetd", "-L",
+ "/usr/lib/uml/port-helper", NULL };
+ struct port_pre_exec_data data;
+
+ new = accept(fd, NULL, 0);
+ if (new < 0)
+ return -errno;
+
+ err = os_pipe(socket, 0, 0);
+ if (err < 0)
+ goto out_close;
+
+ data = ((struct port_pre_exec_data)
+ { .sock_fd = new,
+ .pipe_fd = socket[1] });
+
+ err = run_helper(port_pre_exec, &data, argv);
+ if (err < 0)
+ goto out_shutdown;
+
+ *pid_out = err;
+ return new;
+
+ out_shutdown:
+ shutdown(socket[0], SHUT_RDWR);
+ close(socket[0]);
+ shutdown(socket[1], SHUT_RDWR);
+ close(socket[1]);
+ out_close:
+ close(new);
+ return err;
+}
diff --git a/arch/um/drivers/pty.c b/arch/um/drivers/pty.c
new file mode 100644
index 0000000..f1fcc2c
--- /dev/null
+++ b/arch/um/drivers/pty.c
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <termios.h>
+#include <sys/stat.h>
+#include "chan_user.h"
+#include <os.h>
+#include <um_malloc.h>
+
+struct pty_chan {
+ void (*announce)(char *dev_name, int dev);
+ int dev;
+ int raw;
+ struct termios tt;
+ char dev_name[sizeof("/dev/pts/0123456\0")];
+};
+
+static void *pty_chan_init(char *str, int device, const struct chan_opts *opts)
+{
+ struct pty_chan *data;
+
+ data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
+ if (data == NULL)
+ return NULL;
+
+ *data = ((struct pty_chan) { .announce = opts->announce,
+ .dev = device,
+ .raw = opts->raw });
+ return data;
+}
+
+static int pts_open(int input, int output, int primary, void *d,
+ char **dev_out)
+{
+ struct pty_chan *data = d;
+ char *dev;
+ int fd, err;
+
+ fd = get_pty();
+ if (fd < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "open_pts : Failed to open pts\n");
+ return err;
+ }
+
+ if (data->raw) {
+ CATCH_EINTR(err = tcgetattr(fd, &data->tt));
+ if (err)
+ goto out_close;
+
+ err = raw(fd);
+ if (err)
+ goto out_close;
+ }
+
+ dev = ptsname(fd);
+ sprintf(data->dev_name, "%s", dev);
+ *dev_out = data->dev_name;
+
+ if (data->announce)
+ (*data->announce)(dev, data->dev);
+
+ return fd;
+
+out_close:
+ close(fd);
+ return err;
+}
+
+static int getmaster(char *line)
+{
+ struct stat buf;
+ char *pty, *bank, *cp;
+ int master, err;
+
+ pty = &line[strlen("/dev/ptyp")];
+ for (bank = "pqrs"; *bank; bank++) {
+ line[strlen("/dev/pty")] = *bank;
+ *pty = '0';
+ /* Did we hit the end ? */
+ if ((stat(line, &buf) < 0) && (errno == ENOENT))
+ break;
+
+ for (cp = "0123456789abcdef"; *cp; cp++) {
+ *pty = *cp;
+ master = open(line, O_RDWR);
+ if (master >= 0) {
+ char *tp = &line[strlen("/dev/")];
+
+ /* verify slave side is usable */
+ *tp = 't';
+ err = access(line, R_OK | W_OK);
+ *tp = 'p';
+ if (!err)
+ return master;
+ close(master);
+ }
+ }
+ }
+
+ printk(UM_KERN_ERR "getmaster - no usable host pty devices\n");
+ return -ENOENT;
+}
+
+static int pty_open(int input, int output, int primary, void *d,
+ char **dev_out)
+{
+ struct pty_chan *data = d;
+ int fd, err;
+ char dev[sizeof("/dev/ptyxx\0")] = "/dev/ptyxx";
+
+ fd = getmaster(dev);
+ if (fd < 0)
+ return fd;
+
+ if (data->raw) {
+ err = raw(fd);
+ if (err) {
+ close(fd);
+ return err;
+ }
+ }
+
+ if (data->announce)
+ (*data->announce)(dev, data->dev);
+
+ sprintf(data->dev_name, "%s", dev);
+ *dev_out = data->dev_name;
+
+ return fd;
+}
+
+const struct chan_ops pty_ops = {
+ .type = "pty",
+ .init = pty_chan_init,
+ .open = pty_open,
+ .close = generic_close,
+ .read = generic_read,
+ .write = generic_write,
+ .console_write = generic_console_write,
+ .window_size = generic_window_size,
+ .free = generic_free,
+ .winch = 0,
+};
+
+const struct chan_ops pts_ops = {
+ .type = "pts",
+ .init = pty_chan_init,
+ .open = pts_open,
+ .close = generic_close,
+ .read = generic_read,
+ .write = generic_write,
+ .console_write = generic_console_write,
+ .window_size = generic_window_size,
+ .free = generic_free,
+ .winch = 0,
+};
diff --git a/arch/um/drivers/random.c b/arch/um/drivers/random.c
new file mode 100644
index 0000000..778a0e5
--- /dev/null
+++ b/arch/um/drivers/random.c
@@ -0,0 +1,176 @@
+/* Copyright (C) 2005 - 2008 Jeff Dike <jdike@{linux.intel,addtoit}.com> */
+
+/* Much of this ripped from drivers/char/hw_random.c, see there for other
+ * copyright.
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ */
+#include <linux/sched/signal.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/miscdevice.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+#include <init.h>
+#include <irq_kern.h>
+#include <os.h>
+
+/*
+ * core module and version information
+ */
+#define RNG_VERSION "1.0.0"
+#define RNG_MODULE_NAME "hw_random"
+
+#define RNG_MISCDEV_MINOR 183 /* official */
+
+/* Changed at init time, in the non-modular case, and at module load
+ * time, in the module case. Presumably, the module subsystem
+ * protects against a module being loaded twice at the same time.
+ */
+static int random_fd = -1;
+static DECLARE_WAIT_QUEUE_HEAD(host_read_wait);
+
+static int rng_dev_open (struct inode *inode, struct file *filp)
+{
+ /* enforce read-only access to this chrdev */
+ if ((filp->f_mode & FMODE_READ) == 0)
+ return -EINVAL;
+ if ((filp->f_mode & FMODE_WRITE) != 0)
+ return -EINVAL;
+
+ return 0;
+}
+
+static atomic_t host_sleep_count = ATOMIC_INIT(0);
+
+static ssize_t rng_dev_read (struct file *filp, char __user *buf, size_t size,
+ loff_t *offp)
+{
+ u32 data;
+ int n, ret = 0, have_data;
+
+ while (size) {
+ n = os_read_file(random_fd, &data, sizeof(data));
+ if (n > 0) {
+ have_data = n;
+ while (have_data && size) {
+ if (put_user((u8) data, buf++)) {
+ ret = ret ? : -EFAULT;
+ break;
+ }
+ size--;
+ ret++;
+ have_data--;
+ data >>= 8;
+ }
+ }
+ else if (n == -EAGAIN) {
+ DECLARE_WAITQUEUE(wait, current);
+
+ if (filp->f_flags & O_NONBLOCK)
+ return ret ? : -EAGAIN;
+
+ atomic_inc(&host_sleep_count);
+ reactivate_fd(random_fd, RANDOM_IRQ);
+ add_sigio_fd(random_fd);
+
+ add_wait_queue(&host_read_wait, &wait);
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ schedule();
+ remove_wait_queue(&host_read_wait, &wait);
+
+ if (atomic_dec_and_test(&host_sleep_count)) {
+ ignore_sigio_fd(random_fd);
+ deactivate_fd(random_fd, RANDOM_IRQ);
+ }
+ }
+ else
+ return n;
+
+ if (signal_pending (current))
+ return ret ? : -ERESTARTSYS;
+ }
+ return ret;
+}
+
+static const struct file_operations rng_chrdev_ops = {
+ .owner = THIS_MODULE,
+ .open = rng_dev_open,
+ .read = rng_dev_read,
+ .llseek = noop_llseek,
+};
+
+/* rng_init shouldn't be called more than once at boot time */
+static struct miscdevice rng_miscdev = {
+ RNG_MISCDEV_MINOR,
+ RNG_MODULE_NAME,
+ &rng_chrdev_ops,
+};
+
+static irqreturn_t random_interrupt(int irq, void *data)
+{
+ wake_up(&host_read_wait);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * rng_init - initialize RNG module
+ */
+static int __init rng_init (void)
+{
+ int err;
+
+ err = os_open_file("/dev/random", of_read(OPENFLAGS()), 0);
+ if (err < 0)
+ goto out;
+
+ random_fd = err;
+
+ err = um_request_irq(RANDOM_IRQ, random_fd, IRQ_READ, random_interrupt,
+ 0, "random", NULL);
+ if (err)
+ goto err_out_cleanup_hw;
+
+ sigio_broken(random_fd, 1);
+
+ err = misc_register (&rng_miscdev);
+ if (err) {
+ printk (KERN_ERR RNG_MODULE_NAME ": misc device register "
+ "failed\n");
+ goto err_out_cleanup_hw;
+ }
+out:
+ return err;
+
+err_out_cleanup_hw:
+ os_close_file(random_fd);
+ random_fd = -1;
+ goto out;
+}
+
+/*
+ * rng_cleanup - shutdown RNG module
+ */
+
+static void cleanup(void)
+{
+ free_irq_by_fd(random_fd);
+ os_close_file(random_fd);
+}
+
+static void __exit rng_cleanup(void)
+{
+ os_close_file(random_fd);
+ misc_deregister (&rng_miscdev);
+}
+
+module_init (rng_init);
+module_exit (rng_cleanup);
+__uml_exitcall(cleanup);
+
+MODULE_DESCRIPTION("UML Host Random Number Generator (RNG) driver");
+MODULE_LICENSE("GPL");
diff --git a/arch/um/drivers/slip.h b/arch/um/drivers/slip.h
new file mode 100644
index 0000000..0f3b7ca
--- /dev/null
+++ b/arch/um/drivers/slip.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __UM_SLIP_H
+#define __UM_SLIP_H
+
+#include "slip_common.h"
+
+struct slip_data {
+ void *dev;
+ char name[sizeof("slnnnnn\0")];
+ char *addr;
+ char *gate_addr;
+ int slave;
+ struct slip_proto slip;
+};
+
+extern const struct net_user_info slip_user_info;
+
+extern int slip_user_read(int fd, void *buf, int len, struct slip_data *pri);
+extern int slip_user_write(int fd, void *buf, int len, struct slip_data *pri);
+
+#endif
diff --git a/arch/um/drivers/slip_common.c b/arch/um/drivers/slip_common.c
new file mode 100644
index 0000000..20fe4f4
--- /dev/null
+++ b/arch/um/drivers/slip_common.c
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <string.h>
+#include "slip_common.h"
+#include <net_user.h>
+
+int slip_proto_read(int fd, void *buf, int len, struct slip_proto *slip)
+{
+ int i, n, size, start;
+
+ if(slip->more > 0){
+ i = 0;
+ while(i < slip->more){
+ size = slip_unesc(slip->ibuf[i++], slip->ibuf,
+ &slip->pos, &slip->esc);
+ if(size){
+ memcpy(buf, slip->ibuf, size);
+ memmove(slip->ibuf, &slip->ibuf[i],
+ slip->more - i);
+ slip->more = slip->more - i;
+ return size;
+ }
+ }
+ slip->more = 0;
+ }
+
+ n = net_read(fd, &slip->ibuf[slip->pos],
+ sizeof(slip->ibuf) - slip->pos);
+ if(n <= 0)
+ return n;
+
+ start = slip->pos;
+ for(i = 0; i < n; i++){
+ size = slip_unesc(slip->ibuf[start + i], slip->ibuf,&slip->pos,
+ &slip->esc);
+ if(size){
+ memcpy(buf, slip->ibuf, size);
+ memmove(slip->ibuf, &slip->ibuf[start+i+1],
+ n - (i + 1));
+ slip->more = n - (i + 1);
+ return size;
+ }
+ }
+ return 0;
+}
+
+int slip_proto_write(int fd, void *buf, int len, struct slip_proto *slip)
+{
+ int actual, n;
+
+ actual = slip_esc(buf, slip->obuf, len);
+ n = net_write(fd, slip->obuf, actual);
+ if(n < 0)
+ return n;
+ else return len;
+}
diff --git a/arch/um/drivers/slip_common.h b/arch/um/drivers/slip_common.h
new file mode 100644
index 0000000..d3798b5
--- /dev/null
+++ b/arch/um/drivers/slip_common.h
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __UM_SLIP_COMMON_H
+#define __UM_SLIP_COMMON_H
+
+#define BUF_SIZE 1500
+ /* two bytes each for a (pathological) max packet of escaped chars + *
+ * terminating END char + initial END char */
+#define ENC_BUF_SIZE (2 * BUF_SIZE + 2)
+
+/* SLIP protocol characters. */
+#define SLIP_END 0300 /* indicates end of frame */
+#define SLIP_ESC 0333 /* indicates byte stuffing */
+#define SLIP_ESC_END 0334 /* ESC ESC_END means END 'data' */
+#define SLIP_ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */
+
+static inline int slip_unesc(unsigned char c, unsigned char *buf, int *pos,
+ int *esc)
+{
+ int ret;
+
+ switch(c){
+ case SLIP_END:
+ *esc = 0;
+ ret=*pos;
+ *pos=0;
+ return(ret);
+ case SLIP_ESC:
+ *esc = 1;
+ return(0);
+ case SLIP_ESC_ESC:
+ if(*esc){
+ *esc = 0;
+ c = SLIP_ESC;
+ }
+ break;
+ case SLIP_ESC_END:
+ if(*esc){
+ *esc = 0;
+ c = SLIP_END;
+ }
+ break;
+ }
+ buf[(*pos)++] = c;
+ return(0);
+}
+
+static inline int slip_esc(unsigned char *s, unsigned char *d, int len)
+{
+ unsigned char *ptr = d;
+ unsigned char c;
+
+ /*
+ * Send an initial END character to flush out any
+ * data that may have accumulated in the receiver
+ * due to line noise.
+ */
+
+ *ptr++ = SLIP_END;
+
+ /*
+ * For each byte in the packet, send the appropriate
+ * character sequence, according to the SLIP protocol.
+ */
+
+ while (len-- > 0) {
+ switch(c = *s++) {
+ case SLIP_END:
+ *ptr++ = SLIP_ESC;
+ *ptr++ = SLIP_ESC_END;
+ break;
+ case SLIP_ESC:
+ *ptr++ = SLIP_ESC;
+ *ptr++ = SLIP_ESC_ESC;
+ break;
+ default:
+ *ptr++ = c;
+ break;
+ }
+ }
+ *ptr++ = SLIP_END;
+ return (ptr - d);
+}
+
+struct slip_proto {
+ unsigned char ibuf[ENC_BUF_SIZE];
+ unsigned char obuf[ENC_BUF_SIZE];
+ int more; /* more data: do not read fd until ibuf has been drained */
+ int pos;
+ int esc;
+};
+
+static inline void slip_proto_init(struct slip_proto * slip)
+{
+ memset(slip->ibuf, 0, sizeof(slip->ibuf));
+ memset(slip->obuf, 0, sizeof(slip->obuf));
+ slip->more = 0;
+ slip->pos = 0;
+ slip->esc = 0;
+}
+
+extern int slip_proto_read(int fd, void *buf, int len,
+ struct slip_proto *slip);
+extern int slip_proto_write(int fd, void *buf, int len,
+ struct slip_proto *slip);
+
+#endif
diff --git a/arch/um/drivers/slip_kern.c b/arch/um/drivers/slip_kern.c
new file mode 100644
index 0000000..ed5249f
--- /dev/null
+++ b/arch/um/drivers/slip_kern.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <linux/if_arp.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <net_kern.h>
+#include "slip.h"
+
+struct slip_init {
+ char *gate_addr;
+};
+
+static void slip_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *private;
+ struct slip_data *spri;
+ struct slip_init *init = data;
+
+ private = netdev_priv(dev);
+ spri = (struct slip_data *) private->user;
+
+ memset(spri->name, 0, sizeof(spri->name));
+ spri->addr = NULL;
+ spri->gate_addr = init->gate_addr;
+ spri->slave = -1;
+ spri->dev = dev;
+
+ slip_proto_init(&spri->slip);
+
+ dev->hard_header_len = 0;
+ dev->header_ops = NULL;
+ dev->addr_len = 0;
+ dev->type = ARPHRD_SLIP;
+ dev->tx_queue_len = 256;
+ dev->flags = IFF_NOARP;
+ printk("SLIP backend - SLIP IP = %s\n", spri->gate_addr);
+}
+
+static unsigned short slip_protocol(struct sk_buff *skbuff)
+{
+ return htons(ETH_P_IP);
+}
+
+static int slip_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return slip_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
+ (struct slip_data *) &lp->user);
+}
+
+static int slip_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return slip_user_write(fd, skb->data, skb->len,
+ (struct slip_data *) &lp->user);
+}
+
+static const struct net_kern_info slip_kern_info = {
+ .init = slip_init,
+ .protocol = slip_protocol,
+ .read = slip_read,
+ .write = slip_write,
+};
+
+static int slip_setup(char *str, char **mac_out, void *data)
+{
+ struct slip_init *init = data;
+
+ *init = ((struct slip_init) { .gate_addr = NULL });
+
+ if (str[0] != '\0')
+ init->gate_addr = str;
+ return 1;
+}
+
+static struct transport slip_transport = {
+ .list = LIST_HEAD_INIT(slip_transport.list),
+ .name = "slip",
+ .setup = slip_setup,
+ .user = &slip_user_info,
+ .kern = &slip_kern_info,
+ .private_size = sizeof(struct slip_data),
+ .setup_size = sizeof(struct slip_init),
+};
+
+static int register_slip(void)
+{
+ register_transport(&slip_transport);
+ return 0;
+}
+
+late_initcall(register_slip);
diff --git a/arch/um/drivers/slip_user.c b/arch/um/drivers/slip_user.c
new file mode 100644
index 0000000..0d6b66c
--- /dev/null
+++ b/arch/um/drivers/slip_user.c
@@ -0,0 +1,251 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/termios.h>
+#include <sys/wait.h>
+#include <net_user.h>
+#include <os.h>
+#include "slip.h"
+#include <um_malloc.h>
+
+static int slip_user_init(void *data, void *dev)
+{
+ struct slip_data *pri = data;
+
+ pri->dev = dev;
+ return 0;
+}
+
+static int set_up_tty(int fd)
+{
+ int i;
+ struct termios tios;
+
+ if (tcgetattr(fd, &tios) < 0) {
+ printk(UM_KERN_ERR "could not get initial terminal "
+ "attributes\n");
+ return -1;
+ }
+
+ tios.c_cflag = CS8 | CREAD | HUPCL | CLOCAL;
+ tios.c_iflag = IGNBRK | IGNPAR;
+ tios.c_oflag = 0;
+ tios.c_lflag = 0;
+ for (i = 0; i < NCCS; i++)
+ tios.c_cc[i] = 0;
+ tios.c_cc[VMIN] = 1;
+ tios.c_cc[VTIME] = 0;
+
+ cfsetospeed(&tios, B38400);
+ cfsetispeed(&tios, B38400);
+
+ if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
+ printk(UM_KERN_ERR "failed to set terminal attributes\n");
+ return -1;
+ }
+ return 0;
+}
+
+struct slip_pre_exec_data {
+ int stdin_fd;
+ int stdout_fd;
+ int close_me;
+};
+
+static void slip_pre_exec(void *arg)
+{
+ struct slip_pre_exec_data *data = arg;
+
+ if (data->stdin_fd >= 0)
+ dup2(data->stdin_fd, 0);
+ dup2(data->stdout_fd, 1);
+ if (data->close_me >= 0)
+ close(data->close_me);
+}
+
+static int slip_tramp(char **argv, int fd)
+{
+ struct slip_pre_exec_data pe_data;
+ char *output;
+ int pid, fds[2], err, output_len;
+
+ err = os_pipe(fds, 1, 0);
+ if (err < 0) {
+ printk(UM_KERN_ERR "slip_tramp : pipe failed, err = %d\n",
+ -err);
+ goto out;
+ }
+
+ err = 0;
+ pe_data.stdin_fd = fd;
+ pe_data.stdout_fd = fds[1];
+ pe_data.close_me = fds[0];
+ err = run_helper(slip_pre_exec, &pe_data, argv);
+ if (err < 0)
+ goto out_close;
+ pid = err;
+
+ output_len = UM_KERN_PAGE_SIZE;
+ output = uml_kmalloc(output_len, UM_GFP_KERNEL);
+ if (output == NULL) {
+ printk(UM_KERN_ERR "slip_tramp : failed to allocate output "
+ "buffer\n");
+ os_kill_process(pid, 1);
+ err = -ENOMEM;
+ goto out_close;
+ }
+
+ close(fds[1]);
+ read_output(fds[0], output, output_len);
+ printk("%s", output);
+
+ err = helper_wait(pid);
+ close(fds[0]);
+
+ kfree(output);
+ return err;
+
+out_close:
+ close(fds[0]);
+ close(fds[1]);
+out:
+ return err;
+}
+
+static int slip_open(void *data)
+{
+ struct slip_data *pri = data;
+ char version_buf[sizeof("nnnnn\0")];
+ char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
+ char *argv[] = { "uml_net", version_buf, "slip", "up", gate_buf,
+ NULL };
+ int sfd, mfd, err;
+
+ err = get_pty();
+ if (err < 0) {
+ printk(UM_KERN_ERR "slip-open : Failed to open pty, err = %d\n",
+ -err);
+ goto out;
+ }
+ mfd = err;
+
+ err = open(ptsname(mfd), O_RDWR, 0);
+ if (err < 0) {
+ printk(UM_KERN_ERR "Couldn't open tty for slip line, "
+ "err = %d\n", -err);
+ goto out_close;
+ }
+ sfd = err;
+
+ if (set_up_tty(sfd))
+ goto out_close2;
+
+ pri->slave = sfd;
+ pri->slip.pos = 0;
+ pri->slip.esc = 0;
+ if (pri->gate_addr != NULL) {
+ sprintf(version_buf, "%d", UML_NET_VERSION);
+ strcpy(gate_buf, pri->gate_addr);
+
+ err = slip_tramp(argv, sfd);
+
+ if (err < 0) {
+ printk(UM_KERN_ERR "slip_tramp failed - err = %d\n",
+ -err);
+ goto out_close2;
+ }
+ err = os_get_ifname(pri->slave, pri->name);
+ if (err < 0) {
+ printk(UM_KERN_ERR "get_ifname failed, err = %d\n",
+ -err);
+ goto out_close2;
+ }
+ iter_addresses(pri->dev, open_addr, pri->name);
+ }
+ else {
+ err = os_set_slip(sfd);
+ if (err < 0) {
+ printk(UM_KERN_ERR "Failed to set slip discipline "
+ "encapsulation - err = %d\n", -err);
+ goto out_close2;
+ }
+ }
+ return mfd;
+out_close2:
+ close(sfd);
+out_close:
+ close(mfd);
+out:
+ return err;
+}
+
+static void slip_close(int fd, void *data)
+{
+ struct slip_data *pri = data;
+ char version_buf[sizeof("nnnnn\0")];
+ char *argv[] = { "uml_net", version_buf, "slip", "down", pri->name,
+ NULL };
+ int err;
+
+ if (pri->gate_addr != NULL)
+ iter_addresses(pri->dev, close_addr, pri->name);
+
+ sprintf(version_buf, "%d", UML_NET_VERSION);
+
+ err = slip_tramp(argv, pri->slave);
+
+ if (err != 0)
+ printk(UM_KERN_ERR "slip_tramp failed - errno = %d\n", -err);
+ close(fd);
+ close(pri->slave);
+ pri->slave = -1;
+}
+
+int slip_user_read(int fd, void *buf, int len, struct slip_data *pri)
+{
+ return slip_proto_read(fd, buf, len, &pri->slip);
+}
+
+int slip_user_write(int fd, void *buf, int len, struct slip_data *pri)
+{
+ return slip_proto_write(fd, buf, len, &pri->slip);
+}
+
+static void slip_add_addr(unsigned char *addr, unsigned char *netmask,
+ void *data)
+{
+ struct slip_data *pri = data;
+
+ if (pri->slave < 0)
+ return;
+ open_addr(addr, netmask, pri->name);
+}
+
+static void slip_del_addr(unsigned char *addr, unsigned char *netmask,
+ void *data)
+{
+ struct slip_data *pri = data;
+
+ if (pri->slave < 0)
+ return;
+ close_addr(addr, netmask, pri->name);
+}
+
+const struct net_user_info slip_user_info = {
+ .init = slip_user_init,
+ .open = slip_open,
+ .close = slip_close,
+ .remove = NULL,
+ .add_address = slip_add_addr,
+ .delete_address = slip_del_addr,
+ .mtu = BUF_SIZE,
+ .max_packet = BUF_SIZE,
+};
diff --git a/arch/um/drivers/slirp.h b/arch/um/drivers/slirp.h
new file mode 100644
index 0000000..4aef2b8
--- /dev/null
+++ b/arch/um/drivers/slirp.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __UM_SLIRP_H
+#define __UM_SLIRP_H
+
+#include "slip_common.h"
+
+#define SLIRP_MAX_ARGS 100
+/*
+ * XXX this next definition is here because I don't understand why this
+ * initializer doesn't work in slirp_kern.c:
+ *
+ * argv : { init->argv[ 0 ... SLIRP_MAX_ARGS-1 ] },
+ *
+ * or why I can't typecast like this:
+ *
+ * argv : (char* [SLIRP_MAX_ARGS])(init->argv),
+ */
+struct arg_list_dummy_wrapper { char *argv[SLIRP_MAX_ARGS]; };
+
+struct slirp_data {
+ void *dev;
+ struct arg_list_dummy_wrapper argw;
+ int pid;
+ int slave;
+ struct slip_proto slip;
+};
+
+extern const struct net_user_info slirp_user_info;
+
+extern int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri);
+extern int slirp_user_write(int fd, void *buf, int len,
+ struct slirp_data *pri);
+
+#endif
diff --git a/arch/um/drivers/slirp_kern.c b/arch/um/drivers/slirp_kern.c
new file mode 100644
index 0000000..4ef11ca
--- /dev/null
+++ b/arch/um/drivers/slirp_kern.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <linux/if_arp.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/string.h>
+#include <net_kern.h>
+#include <net_user.h>
+#include "slirp.h"
+
+struct slirp_init {
+ struct arg_list_dummy_wrapper argw; /* XXX should be simpler... */
+};
+
+void slirp_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *private;
+ struct slirp_data *spri;
+ struct slirp_init *init = data;
+ int i;
+
+ private = netdev_priv(dev);
+ spri = (struct slirp_data *) private->user;
+
+ spri->argw = init->argw;
+ spri->pid = -1;
+ spri->slave = -1;
+ spri->dev = dev;
+
+ slip_proto_init(&spri->slip);
+
+ dev->hard_header_len = 0;
+ dev->header_ops = NULL;
+ dev->addr_len = 0;
+ dev->type = ARPHRD_SLIP;
+ dev->tx_queue_len = 256;
+ dev->flags = IFF_NOARP;
+ printk("SLIRP backend - command line:");
+ for (i = 0; spri->argw.argv[i] != NULL; i++)
+ printk(" '%s'",spri->argw.argv[i]);
+ printk("\n");
+}
+
+static unsigned short slirp_protocol(struct sk_buff *skbuff)
+{
+ return htons(ETH_P_IP);
+}
+
+static int slirp_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return slirp_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
+ (struct slirp_data *) &lp->user);
+}
+
+static int slirp_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return slirp_user_write(fd, skb->data, skb->len,
+ (struct slirp_data *) &lp->user);
+}
+
+const struct net_kern_info slirp_kern_info = {
+ .init = slirp_init,
+ .protocol = slirp_protocol,
+ .read = slirp_read,
+ .write = slirp_write,
+};
+
+static int slirp_setup(char *str, char **mac_out, void *data)
+{
+ struct slirp_init *init = data;
+ int i=0;
+
+ *init = ((struct slirp_init) { .argw = { { "slirp", NULL } } });
+
+ str = split_if_spec(str, mac_out, NULL);
+
+ if (str == NULL) /* no command line given after MAC addr */
+ return 1;
+
+ do {
+ if (i >= SLIRP_MAX_ARGS - 1) {
+ printk(KERN_WARNING "slirp_setup: truncating slirp "
+ "arguments\n");
+ break;
+ }
+ init->argw.argv[i++] = str;
+ while(*str && *str!=',') {
+ if (*str == '_')
+ *str=' ';
+ str++;
+ }
+ if (*str != ',')
+ break;
+ *str++ = '\0';
+ } while (1);
+
+ init->argw.argv[i] = NULL;
+ return 1;
+}
+
+static struct transport slirp_transport = {
+ .list = LIST_HEAD_INIT(slirp_transport.list),
+ .name = "slirp",
+ .setup = slirp_setup,
+ .user = &slirp_user_info,
+ .kern = &slirp_kern_info,
+ .private_size = sizeof(struct slirp_data),
+ .setup_size = sizeof(struct slirp_init),
+};
+
+static int register_slirp(void)
+{
+ register_transport(&slirp_transport);
+ return 0;
+}
+
+late_initcall(register_slirp);
diff --git a/arch/um/drivers/slirp_user.c b/arch/um/drivers/slirp_user.c
new file mode 100644
index 0000000..98b6a41
--- /dev/null
+++ b/arch/um/drivers/slirp_user.c
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <net_user.h>
+#include <os.h>
+#include "slirp.h"
+
+static int slirp_user_init(void *data, void *dev)
+{
+ struct slirp_data *pri = data;
+
+ pri->dev = dev;
+ return 0;
+}
+
+struct slirp_pre_exec_data {
+ int stdin_fd;
+ int stdout_fd;
+};
+
+static void slirp_pre_exec(void *arg)
+{
+ struct slirp_pre_exec_data *data = arg;
+
+ if (data->stdin_fd != -1)
+ dup2(data->stdin_fd, 0);
+ if (data->stdout_fd != -1)
+ dup2(data->stdout_fd, 1);
+}
+
+static int slirp_tramp(char **argv, int fd)
+{
+ struct slirp_pre_exec_data pe_data;
+ int pid;
+
+ pe_data.stdin_fd = fd;
+ pe_data.stdout_fd = fd;
+ pid = run_helper(slirp_pre_exec, &pe_data, argv);
+
+ return pid;
+}
+
+static int slirp_open(void *data)
+{
+ struct slirp_data *pri = data;
+ int fds[2], pid, err;
+
+ err = os_pipe(fds, 1, 1);
+ if (err)
+ return err;
+
+ err = slirp_tramp(pri->argw.argv, fds[1]);
+ if (err < 0) {
+ printk(UM_KERN_ERR "slirp_tramp failed - errno = %d\n", -err);
+ goto out;
+ }
+ pid = err;
+
+ pri->slave = fds[1];
+ pri->slip.pos = 0;
+ pri->slip.esc = 0;
+ pri->pid = err;
+
+ return fds[0];
+out:
+ close(fds[0]);
+ close(fds[1]);
+ return err;
+}
+
+static void slirp_close(int fd, void *data)
+{
+ struct slirp_data *pri = data;
+ int err;
+
+ close(fd);
+ close(pri->slave);
+
+ pri->slave = -1;
+
+ if (pri->pid<1) {
+ printk(UM_KERN_ERR "slirp_close: no child process to shut "
+ "down\n");
+ return;
+ }
+
+#if 0
+ if (kill(pri->pid, SIGHUP)<0) {
+ printk(UM_KERN_ERR "slirp_close: sending hangup to %d failed "
+ "(%d)\n", pri->pid, errno);
+ }
+#endif
+ err = helper_wait(pri->pid);
+ if (err < 0)
+ return;
+
+ pri->pid = -1;
+}
+
+int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
+{
+ return slip_proto_read(fd, buf, len, &pri->slip);
+}
+
+int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
+{
+ return slip_proto_write(fd, buf, len, &pri->slip);
+}
+
+const struct net_user_info slirp_user_info = {
+ .init = slirp_user_init,
+ .open = slirp_open,
+ .close = slirp_close,
+ .remove = NULL,
+ .add_address = NULL,
+ .delete_address = NULL,
+ .mtu = BUF_SIZE,
+ .max_packet = BUF_SIZE,
+};
diff --git a/arch/um/drivers/ssl.c b/arch/um/drivers/ssl.c
new file mode 100644
index 0000000..b8d14fa
--- /dev/null
+++ b/arch/um/drivers/ssl.c
@@ -0,0 +1,199 @@
+/*
+ * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/fs.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/major.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <asm/termbits.h>
+#include <asm/irq.h>
+#include "ssl.h"
+#include "chan.h"
+#include <init.h>
+#include <irq_user.h>
+#include "mconsole_kern.h"
+
+static const int ssl_version = 1;
+
+#define NR_PORTS 64
+
+static void ssl_announce(char *dev_name, int dev)
+{
+ printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
+ dev_name);
+}
+
+/* Almost const, except that xterm_title may be changed in an initcall */
+static struct chan_opts opts = {
+ .announce = ssl_announce,
+ .xterm_title = "Serial Line #%d",
+ .raw = 1,
+};
+
+static int ssl_config(char *str, char **error_out);
+static int ssl_get_config(char *dev, char *str, int size, char **error_out);
+static int ssl_remove(int n, char **error_out);
+
+
+/* Const, except for .mc.list */
+static struct line_driver driver = {
+ .name = "UML serial line",
+ .device_name = "ttyS",
+ .major = TTY_MAJOR,
+ .minor_start = 64,
+ .type = TTY_DRIVER_TYPE_SERIAL,
+ .subtype = 0,
+ .read_irq = SSL_IRQ,
+ .read_irq_name = "ssl",
+ .write_irq = SSL_WRITE_IRQ,
+ .write_irq_name = "ssl-write",
+ .mc = {
+ .list = LIST_HEAD_INIT(driver.mc.list),
+ .name = "ssl",
+ .config = ssl_config,
+ .get_config = ssl_get_config,
+ .id = line_id,
+ .remove = ssl_remove,
+ },
+};
+
+/* The array is initialized by line_init, at initcall time. The
+ * elements are locked individually as needed.
+ */
+static char *conf[NR_PORTS];
+static char *def_conf = CONFIG_SSL_CHAN;
+static struct line serial_lines[NR_PORTS];
+
+static int ssl_config(char *str, char **error_out)
+{
+ return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts,
+ error_out);
+}
+
+static int ssl_get_config(char *dev, char *str, int size, char **error_out)
+{
+ return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str,
+ size, error_out);
+}
+
+static int ssl_remove(int n, char **error_out)
+{
+ return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n,
+ error_out);
+}
+
+static int ssl_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+ return line_install(driver, tty, &serial_lines[tty->index]);
+}
+
+static const struct tty_operations ssl_ops = {
+ .open = line_open,
+ .close = line_close,
+ .write = line_write,
+ .put_char = line_put_char,
+ .write_room = line_write_room,
+ .chars_in_buffer = line_chars_in_buffer,
+ .flush_buffer = line_flush_buffer,
+ .flush_chars = line_flush_chars,
+ .set_termios = line_set_termios,
+ .throttle = line_throttle,
+ .unthrottle = line_unthrottle,
+ .install = ssl_install,
+ .hangup = line_hangup,
+};
+
+/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
+ * by being an initcall and exitcall, respectively.
+ */
+static int ssl_init_done = 0;
+
+static void ssl_console_write(struct console *c, const char *string,
+ unsigned len)
+{
+ struct line *line = &serial_lines[c->index];
+ unsigned long flags;
+
+ spin_lock_irqsave(&line->lock, flags);
+ console_write_chan(line->chan_out, string, len);
+ spin_unlock_irqrestore(&line->lock, flags);
+}
+
+static struct tty_driver *ssl_console_device(struct console *c, int *index)
+{
+ *index = c->index;
+ return driver.driver;
+}
+
+static int ssl_console_setup(struct console *co, char *options)
+{
+ struct line *line = &serial_lines[co->index];
+
+ return console_open_chan(line, co);
+}
+
+/* No locking for register_console call - relies on single-threaded initcalls */
+static struct console ssl_cons = {
+ .name = "ttyS",
+ .write = ssl_console_write,
+ .device = ssl_console_device,
+ .setup = ssl_console_setup,
+ .flags = CON_PRINTBUFFER|CON_ANYTIME,
+ .index = -1,
+};
+
+static int ssl_init(void)
+{
+ char *new_title;
+ int err;
+ int i;
+
+ printk(KERN_INFO "Initializing software serial port version %d\n",
+ ssl_version);
+
+ err = register_lines(&driver, &ssl_ops, serial_lines,
+ ARRAY_SIZE(serial_lines));
+ if (err)
+ return err;
+
+ new_title = add_xterm_umid(opts.xterm_title);
+ if (new_title != NULL)
+ opts.xterm_title = new_title;
+
+ for (i = 0; i < NR_PORTS; i++) {
+ char *error;
+ char *s = conf[i];
+ if (!s)
+ s = def_conf;
+ if (setup_one_line(serial_lines, i, s, &opts, &error))
+ printk(KERN_ERR "setup_one_line failed for "
+ "device %d : %s\n", i, error);
+ }
+
+ ssl_init_done = 1;
+ register_console(&ssl_cons);
+ return 0;
+}
+late_initcall(ssl_init);
+
+static void ssl_exit(void)
+{
+ if (!ssl_init_done)
+ return;
+ close_lines(serial_lines, ARRAY_SIZE(serial_lines));
+}
+__uml_exitcall(ssl_exit);
+
+static int ssl_chan_setup(char *str)
+{
+ line_setup(conf, NR_PORTS, &def_conf, str, "serial line");
+ return 1;
+}
+
+__setup("ssl", ssl_chan_setup);
+__channel_help(ssl_chan_setup, "ssl");
diff --git a/arch/um/drivers/ssl.h b/arch/um/drivers/ssl.h
new file mode 100644
index 0000000..314d177
--- /dev/null
+++ b/arch/um/drivers/ssl.h
@@ -0,0 +1,13 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SSL_H__
+#define __SSL_H__
+
+extern int ssl_read(int fd, int line);
+extern void ssl_receive_char(int line, char ch);
+
+#endif
+
diff --git a/arch/um/drivers/stderr_console.c b/arch/um/drivers/stderr_console.c
new file mode 100644
index 0000000..ecc3a58
--- /dev/null
+++ b/arch/um/drivers/stderr_console.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/console.h>
+
+#include "chan_user.h"
+
+/* ----------------------------------------------------------------------------- */
+/* trivial console driver -- simply dump everything to stderr */
+
+/*
+ * Don't register by default -- as this registers very early in the
+ * boot process it becomes the default console.
+ *
+ * Initialized at init time.
+ */
+static int use_stderr_console = 0;
+
+static void stderr_console_write(struct console *console, const char *string,
+ unsigned len)
+{
+ generic_write(2 /* stderr */, string, len, NULL);
+}
+
+static struct console stderr_console = {
+ .name = "stderr",
+ .write = stderr_console_write,
+ .flags = CON_PRINTBUFFER,
+};
+
+static int __init stderr_console_init(void)
+{
+ if (use_stderr_console)
+ register_console(&stderr_console);
+ return 0;
+}
+console_initcall(stderr_console_init);
+
+static int stderr_setup(char *str)
+{
+ if (!str)
+ return 0;
+ use_stderr_console = simple_strtoul(str,&str,0);
+ return 1;
+}
+__setup("stderr=", stderr_setup);
+
+/* The previous behavior of not unregistering led to /dev/console being
+ * impossible to open. My FC5 filesystem started having init die, and the
+ * system panicing because of this. Unregistering causes the real
+ * console to become the default console, and /dev/console can then be
+ * opened. Making this an initcall makes this happen late enough that
+ * there is no added value in dumping everything to stderr, and the
+ * normal console is good enough to show you all available output.
+ */
+static int __init unregister_stderr(void)
+{
+ unregister_console(&stderr_console);
+
+ return 0;
+}
+
+__initcall(unregister_stderr);
diff --git a/arch/um/drivers/stdio_console.c b/arch/um/drivers/stdio_console.c
new file mode 100644
index 0000000..c90817b
--- /dev/null
+++ b/arch/um/drivers/stdio_console.c
@@ -0,0 +1,202 @@
+/*
+ * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/posix_types.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/types.h>
+#include <linux/major.h>
+#include <linux/kdev_t.h>
+#include <linux/console.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <linux/list.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/hardirq.h>
+#include <asm/current.h>
+#include <asm/irq.h>
+#include "stdio_console.h"
+#include "chan.h"
+#include <irq_user.h>
+#include "mconsole_kern.h"
+#include <init.h>
+
+#define MAX_TTYS (16)
+
+static void stdio_announce(char *dev_name, int dev)
+{
+ printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
+ dev_name);
+}
+
+/* Almost const, except that xterm_title may be changed in an initcall */
+static struct chan_opts opts = {
+ .announce = stdio_announce,
+ .xterm_title = "Virtual Console #%d",
+ .raw = 1,
+};
+
+static int con_config(char *str, char **error_out);
+static int con_get_config(char *dev, char *str, int size, char **error_out);
+static int con_remove(int n, char **con_remove);
+
+
+/* Const, except for .mc.list */
+static struct line_driver driver = {
+ .name = "UML console",
+ .device_name = "tty",
+ .major = TTY_MAJOR,
+ .minor_start = 0,
+ .type = TTY_DRIVER_TYPE_CONSOLE,
+ .subtype = SYSTEM_TYPE_CONSOLE,
+ .read_irq = CONSOLE_IRQ,
+ .read_irq_name = "console",
+ .write_irq = CONSOLE_WRITE_IRQ,
+ .write_irq_name = "console-write",
+ .mc = {
+ .list = LIST_HEAD_INIT(driver.mc.list),
+ .name = "con",
+ .config = con_config,
+ .get_config = con_get_config,
+ .id = line_id,
+ .remove = con_remove,
+ },
+};
+
+/* The array is initialized by line_init, at initcall time. The
+ * elements are locked individually as needed.
+ */
+static char *vt_conf[MAX_TTYS];
+static char *def_conf;
+static struct line vts[MAX_TTYS];
+
+static int con_config(char *str, char **error_out)
+{
+ return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out);
+}
+
+static int con_get_config(char *dev, char *str, int size, char **error_out)
+{
+ return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);
+}
+
+static int con_remove(int n, char **error_out)
+{
+ return line_remove(vts, ARRAY_SIZE(vts), n, error_out);
+}
+
+/* Set in an initcall, checked in an exitcall */
+static int con_init_done = 0;
+
+static int con_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+ return line_install(driver, tty, &vts[tty->index]);
+}
+
+static const struct tty_operations console_ops = {
+ .open = line_open,
+ .install = con_install,
+ .close = line_close,
+ .write = line_write,
+ .put_char = line_put_char,
+ .write_room = line_write_room,
+ .chars_in_buffer = line_chars_in_buffer,
+ .flush_buffer = line_flush_buffer,
+ .flush_chars = line_flush_chars,
+ .set_termios = line_set_termios,
+ .throttle = line_throttle,
+ .unthrottle = line_unthrottle,
+ .hangup = line_hangup,
+};
+
+static void uml_console_write(struct console *console, const char *string,
+ unsigned len)
+{
+ struct line *line = &vts[console->index];
+ unsigned long flags;
+
+ spin_lock_irqsave(&line->lock, flags);
+ console_write_chan(line->chan_out, string, len);
+ spin_unlock_irqrestore(&line->lock, flags);
+}
+
+static struct tty_driver *uml_console_device(struct console *c, int *index)
+{
+ *index = c->index;
+ return driver.driver;
+}
+
+static int uml_console_setup(struct console *co, char *options)
+{
+ struct line *line = &vts[co->index];
+
+ return console_open_chan(line, co);
+}
+
+/* No locking for register_console call - relies on single-threaded initcalls */
+static struct console stdiocons = {
+ .name = "tty",
+ .write = uml_console_write,
+ .device = uml_console_device,
+ .setup = uml_console_setup,
+ .flags = CON_PRINTBUFFER|CON_ANYTIME,
+ .index = -1,
+};
+
+static int stdio_init(void)
+{
+ char *new_title;
+ int err;
+ int i;
+
+ err = register_lines(&driver, &console_ops, vts,
+ ARRAY_SIZE(vts));
+ if (err)
+ return err;
+
+ printk(KERN_INFO "Initialized stdio console driver\n");
+
+ new_title = add_xterm_umid(opts.xterm_title);
+ if(new_title != NULL)
+ opts.xterm_title = new_title;
+
+ for (i = 0; i < MAX_TTYS; i++) {
+ char *error;
+ char *s = vt_conf[i];
+ if (!s)
+ s = def_conf;
+ if (!s)
+ s = i ? CONFIG_CON_CHAN : CONFIG_CON_ZERO_CHAN;
+ if (setup_one_line(vts, i, s, &opts, &error))
+ printk(KERN_ERR "setup_one_line failed for "
+ "device %d : %s\n", i, error);
+ }
+
+ con_init_done = 1;
+ register_console(&stdiocons);
+ return 0;
+}
+late_initcall(stdio_init);
+
+static void console_exit(void)
+{
+ if (!con_init_done)
+ return;
+ close_lines(vts, ARRAY_SIZE(vts));
+}
+__uml_exitcall(console_exit);
+
+static int console_chan_setup(char *str)
+{
+ if (!strncmp(str, "sole=", 5)) /* console= option specifies tty */
+ return 0;
+
+ line_setup(vt_conf, MAX_TTYS, &def_conf, str, "console");
+ return 1;
+}
+__setup("con", console_chan_setup);
+__channel_help(console_chan_setup, "con");
diff --git a/arch/um/drivers/stdio_console.h b/arch/um/drivers/stdio_console.h
new file mode 100644
index 0000000..6d8275f
--- /dev/null
+++ b/arch/um/drivers/stdio_console.h
@@ -0,0 +1,11 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __STDIO_CONSOLE_H
+#define __STDIO_CONSOLE_H
+
+extern void save_console_flags(void);
+#endif
+
diff --git a/arch/um/drivers/tty.c b/arch/um/drivers/tty.c
new file mode 100644
index 0000000..eaa201b
--- /dev/null
+++ b/arch/um/drivers/tty.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <termios.h>
+#include "chan_user.h"
+#include <os.h>
+#include <um_malloc.h>
+
+struct tty_chan {
+ char *dev;
+ int raw;
+ struct termios tt;
+};
+
+static void *tty_chan_init(char *str, int device, const struct chan_opts *opts)
+{
+ struct tty_chan *data;
+
+ if (*str != ':') {
+ printk(UM_KERN_ERR "tty_init : channel type 'tty' must specify "
+ "a device\n");
+ return NULL;
+ }
+ str++;
+
+ data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
+ if (data == NULL)
+ return NULL;
+ *data = ((struct tty_chan) { .dev = str,
+ .raw = opts->raw });
+
+ return data;
+}
+
+static int tty_open(int input, int output, int primary, void *d,
+ char **dev_out)
+{
+ struct tty_chan *data = d;
+ int fd, err, mode = 0;
+
+ if (input && output)
+ mode = O_RDWR;
+ else if (input)
+ mode = O_RDONLY;
+ else if (output)
+ mode = O_WRONLY;
+
+ fd = open(data->dev, mode);
+ if (fd < 0)
+ return -errno;
+
+ if (data->raw) {
+ CATCH_EINTR(err = tcgetattr(fd, &data->tt));
+ if (err)
+ return err;
+
+ err = raw(fd);
+ if (err)
+ return err;
+ }
+
+ *dev_out = data->dev;
+ return fd;
+}
+
+const struct chan_ops tty_ops = {
+ .type = "tty",
+ .init = tty_chan_init,
+ .open = tty_open,
+ .close = generic_close,
+ .read = generic_read,
+ .write = generic_write,
+ .console_write = generic_console_write,
+ .window_size = generic_window_size,
+ .free = generic_free,
+ .winch = 0,
+};
diff --git a/arch/um/drivers/ubd.h b/arch/um/drivers/ubd.h
new file mode 100644
index 0000000..cc1cc85
--- /dev/null
+++ b/arch/um/drivers/ubd.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2001 RidgeRun, Inc (glonnon@ridgerun.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_UBD_USER_H
+#define __UM_UBD_USER_H
+
+extern int start_io_thread(unsigned long sp, int *fds_out);
+extern int io_thread(void *arg);
+extern int kernel_fd;
+
+extern int ubd_read_poll(int timeout);
+extern int ubd_write_poll(int timeout);
+
+#define UBD_REQ_BUFFER_SIZE 64
+
+#endif
+
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
new file mode 100644
index 0000000..83c4703
--- /dev/null
+++ b/arch/um/drivers/ubd_kern.c
@@ -0,0 +1,1593 @@
+/*
+ * Copyright (C) 2015-2016 Anton Ivanov (aivanov@brocade.com)
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+/* 2001-09-28...2002-04-17
+ * Partition stuff by James_McMechan@hotmail.com
+ * old style ubd by setting UBD_SHIFT to 0
+ * 2002-09-27...2002-10-18 massive tinkering for 2.5
+ * partitions have changed in 2.5
+ * 2003-01-29 more tinkering for 2.5.59-1
+ * This should now address the sysfs problems and has
+ * the symlink for devfs to allow for booting with
+ * the common /dev/ubd/discX/... names rather than
+ * only /dev/ubdN/discN this version also has lots of
+ * clean ups preparing for ubd-many.
+ * James McMechan
+ */
+
+#define UBD_SHIFT 4
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/ata.h>
+#include <linux/hdreg.h>
+#include <linux/cdrom.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/ctype.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/platform_device.h>
+#include <linux/scatterlist.h>
+#include <asm/tlbflush.h>
+#include <kern_util.h>
+#include "mconsole_kern.h"
+#include <init.h>
+#include <irq_kern.h>
+#include "ubd.h"
+#include <os.h>
+#include "cow.h"
+
+enum ubd_req { UBD_READ, UBD_WRITE, UBD_FLUSH };
+
+struct io_thread_req {
+ struct request *req;
+ enum ubd_req op;
+ int fds[2];
+ unsigned long offsets[2];
+ unsigned long long offset;
+ unsigned long length;
+ char *buffer;
+ int sectorsize;
+ unsigned long sector_mask;
+ unsigned long long cow_offset;
+ unsigned long bitmap_words[2];
+ int error;
+};
+
+
+static struct io_thread_req * (*irq_req_buffer)[];
+static struct io_thread_req *irq_remainder;
+static int irq_remainder_size;
+
+static struct io_thread_req * (*io_req_buffer)[];
+static struct io_thread_req *io_remainder;
+static int io_remainder_size;
+
+
+
+static inline int ubd_test_bit(__u64 bit, unsigned char *data)
+{
+ __u64 n;
+ int bits, off;
+
+ bits = sizeof(data[0]) * 8;
+ n = bit / bits;
+ off = bit % bits;
+ return (data[n] & (1 << off)) != 0;
+}
+
+static inline void ubd_set_bit(__u64 bit, unsigned char *data)
+{
+ __u64 n;
+ int bits, off;
+
+ bits = sizeof(data[0]) * 8;
+ n = bit / bits;
+ off = bit % bits;
+ data[n] |= (1 << off);
+}
+/*End stuff from ubd_user.h*/
+
+#define DRIVER_NAME "uml-blkdev"
+
+static DEFINE_MUTEX(ubd_lock);
+static DEFINE_MUTEX(ubd_mutex); /* replaces BKL, might not be needed */
+
+static int ubd_open(struct block_device *bdev, fmode_t mode);
+static void ubd_release(struct gendisk *disk, fmode_t mode);
+static int ubd_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg);
+static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo);
+
+#define MAX_DEV (16)
+
+static const struct block_device_operations ubd_blops = {
+ .owner = THIS_MODULE,
+ .open = ubd_open,
+ .release = ubd_release,
+ .ioctl = ubd_ioctl,
+ .getgeo = ubd_getgeo,
+};
+
+/* Protected by ubd_lock */
+static int fake_major = UBD_MAJOR;
+static struct gendisk *ubd_gendisk[MAX_DEV];
+static struct gendisk *fake_gendisk[MAX_DEV];
+
+#ifdef CONFIG_BLK_DEV_UBD_SYNC
+#define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 1, .c = 0, \
+ .cl = 1 })
+#else
+#define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 0, .c = 0, \
+ .cl = 1 })
+#endif
+static struct openflags global_openflags = OPEN_FLAGS;
+
+struct cow {
+ /* backing file name */
+ char *file;
+ /* backing file fd */
+ int fd;
+ unsigned long *bitmap;
+ unsigned long bitmap_len;
+ int bitmap_offset;
+ int data_offset;
+};
+
+#define MAX_SG 64
+
+struct ubd {
+ struct list_head restart;
+ /* name (and fd, below) of the file opened for writing, either the
+ * backing or the cow file. */
+ char *file;
+ int count;
+ int fd;
+ __u64 size;
+ struct openflags boot_openflags;
+ struct openflags openflags;
+ unsigned shared:1;
+ unsigned no_cow:1;
+ struct cow cow;
+ struct platform_device pdev;
+ struct request_queue *queue;
+ spinlock_t lock;
+ struct scatterlist sg[MAX_SG];
+ struct request *request;
+ int start_sg, end_sg;
+ sector_t rq_pos;
+};
+
+#define DEFAULT_COW { \
+ .file = NULL, \
+ .fd = -1, \
+ .bitmap = NULL, \
+ .bitmap_offset = 0, \
+ .data_offset = 0, \
+}
+
+#define DEFAULT_UBD { \
+ .file = NULL, \
+ .count = 0, \
+ .fd = -1, \
+ .size = -1, \
+ .boot_openflags = OPEN_FLAGS, \
+ .openflags = OPEN_FLAGS, \
+ .no_cow = 0, \
+ .shared = 0, \
+ .cow = DEFAULT_COW, \
+ .lock = __SPIN_LOCK_UNLOCKED(ubd_devs.lock), \
+ .request = NULL, \
+ .start_sg = 0, \
+ .end_sg = 0, \
+ .rq_pos = 0, \
+}
+
+/* Protected by ubd_lock */
+static struct ubd ubd_devs[MAX_DEV] = { [0 ... MAX_DEV - 1] = DEFAULT_UBD };
+
+/* Only changed by fake_ide_setup which is a setup */
+static int fake_ide = 0;
+static struct proc_dir_entry *proc_ide_root = NULL;
+static struct proc_dir_entry *proc_ide = NULL;
+
+static void make_proc_ide(void)
+{
+ proc_ide_root = proc_mkdir("ide", NULL);
+ proc_ide = proc_mkdir("ide0", proc_ide_root);
+}
+
+static int fake_ide_media_proc_show(struct seq_file *m, void *v)
+{
+ seq_puts(m, "disk\n");
+ return 0;
+}
+
+static void make_ide_entries(const char *dev_name)
+{
+ struct proc_dir_entry *dir, *ent;
+ char name[64];
+
+ if(proc_ide_root == NULL) make_proc_ide();
+
+ dir = proc_mkdir(dev_name, proc_ide);
+ if(!dir) return;
+
+ ent = proc_create_single("media", S_IRUGO, dir,
+ fake_ide_media_proc_show);
+ if(!ent) return;
+ snprintf(name, sizeof(name), "ide0/%s", dev_name);
+ proc_symlink(dev_name, proc_ide_root, name);
+}
+
+static int fake_ide_setup(char *str)
+{
+ fake_ide = 1;
+ return 1;
+}
+
+__setup("fake_ide", fake_ide_setup);
+
+__uml_help(fake_ide_setup,
+"fake_ide\n"
+" Create ide0 entries that map onto ubd devices.\n\n"
+);
+
+static int parse_unit(char **ptr)
+{
+ char *str = *ptr, *end;
+ int n = -1;
+
+ if(isdigit(*str)) {
+ n = simple_strtoul(str, &end, 0);
+ if(end == str)
+ return -1;
+ *ptr = end;
+ }
+ else if (('a' <= *str) && (*str <= 'z')) {
+ n = *str - 'a';
+ str++;
+ *ptr = str;
+ }
+ return n;
+}
+
+/* If *index_out == -1 at exit, the passed option was a general one;
+ * otherwise, the str pointer is used (and owned) inside ubd_devs array, so it
+ * should not be freed on exit.
+ */
+static int ubd_setup_common(char *str, int *index_out, char **error_out)
+{
+ struct ubd *ubd_dev;
+ struct openflags flags = global_openflags;
+ char *backing_file;
+ int n, err = 0, i;
+
+ if(index_out) *index_out = -1;
+ n = *str;
+ if(n == '='){
+ char *end;
+ int major;
+
+ str++;
+ if(!strcmp(str, "sync")){
+ global_openflags = of_sync(global_openflags);
+ goto out1;
+ }
+
+ err = -EINVAL;
+ major = simple_strtoul(str, &end, 0);
+ if((*end != '\0') || (end == str)){
+ *error_out = "Didn't parse major number";
+ goto out1;
+ }
+
+ mutex_lock(&ubd_lock);
+ if (fake_major != UBD_MAJOR) {
+ *error_out = "Can't assign a fake major twice";
+ goto out1;
+ }
+
+ fake_major = major;
+
+ printk(KERN_INFO "Setting extra ubd major number to %d\n",
+ major);
+ err = 0;
+ out1:
+ mutex_unlock(&ubd_lock);
+ return err;
+ }
+
+ n = parse_unit(&str);
+ if(n < 0){
+ *error_out = "Couldn't parse device number";
+ return -EINVAL;
+ }
+ if(n >= MAX_DEV){
+ *error_out = "Device number out of range";
+ return 1;
+ }
+
+ err = -EBUSY;
+ mutex_lock(&ubd_lock);
+
+ ubd_dev = &ubd_devs[n];
+ if(ubd_dev->file != NULL){
+ *error_out = "Device is already configured";
+ goto out;
+ }
+
+ if (index_out)
+ *index_out = n;
+
+ err = -EINVAL;
+ for (i = 0; i < sizeof("rscd="); i++) {
+ switch (*str) {
+ case 'r':
+ flags.w = 0;
+ break;
+ case 's':
+ flags.s = 1;
+ break;
+ case 'd':
+ ubd_dev->no_cow = 1;
+ break;
+ case 'c':
+ ubd_dev->shared = 1;
+ break;
+ case '=':
+ str++;
+ goto break_loop;
+ default:
+ *error_out = "Expected '=' or flag letter "
+ "(r, s, c, or d)";
+ goto out;
+ }
+ str++;
+ }
+
+ if (*str == '=')
+ *error_out = "Too many flags specified";
+ else
+ *error_out = "Missing '='";
+ goto out;
+
+break_loop:
+ backing_file = strchr(str, ',');
+
+ if (backing_file == NULL)
+ backing_file = strchr(str, ':');
+
+ if(backing_file != NULL){
+ if(ubd_dev->no_cow){
+ *error_out = "Can't specify both 'd' and a cow file";
+ goto out;
+ }
+ else {
+ *backing_file = '\0';
+ backing_file++;
+ }
+ }
+ err = 0;
+ ubd_dev->file = str;
+ ubd_dev->cow.file = backing_file;
+ ubd_dev->boot_openflags = flags;
+out:
+ mutex_unlock(&ubd_lock);
+ return err;
+}
+
+static int ubd_setup(char *str)
+{
+ char *error;
+ int err;
+
+ err = ubd_setup_common(str, NULL, &error);
+ if(err)
+ printk(KERN_ERR "Failed to initialize device with \"%s\" : "
+ "%s\n", str, error);
+ return 1;
+}
+
+__setup("ubd", ubd_setup);
+__uml_help(ubd_setup,
+"ubd<n><flags>=<filename>[(:|,)<filename2>]\n"
+" This is used to associate a device with a file in the underlying\n"
+" filesystem. When specifying two filenames, the first one is the\n"
+" COW name and the second is the backing file name. As separator you can\n"
+" use either a ':' or a ',': the first one allows writing things like;\n"
+" ubd0=~/Uml/root_cow:~/Uml/root_backing_file\n"
+" while with a ',' the shell would not expand the 2nd '~'.\n"
+" When using only one filename, UML will detect whether to treat it like\n"
+" a COW file or a backing file. To override this detection, add the 'd'\n"
+" flag:\n"
+" ubd0d=BackingFile\n"
+" Usually, there is a filesystem in the file, but \n"
+" that's not required. Swap devices containing swap files can be\n"
+" specified like this. Also, a file which doesn't contain a\n"
+" filesystem can have its contents read in the virtual \n"
+" machine by running 'dd' on the device. <n> must be in the range\n"
+" 0 to 7. Appending an 'r' to the number will cause that device\n"
+" to be mounted read-only. For example ubd1r=./ext_fs. Appending\n"
+" an 's' will cause data to be written to disk on the host immediately.\n"
+" 'c' will cause the device to be treated as being shared between multiple\n"
+" UMLs and file locking will be turned off - this is appropriate for a\n"
+" cluster filesystem and inappropriate at almost all other times.\n\n"
+);
+
+static int udb_setup(char *str)
+{
+ printk("udb%s specified on command line is almost certainly a ubd -> "
+ "udb TYPO\n", str);
+ return 1;
+}
+
+__setup("udb", udb_setup);
+__uml_help(udb_setup,
+"udb\n"
+" This option is here solely to catch ubd -> udb typos, which can be\n"
+" to impossible to catch visually unless you specifically look for\n"
+" them. The only result of any option starting with 'udb' is an error\n"
+" in the boot output.\n\n"
+);
+
+static void do_ubd_request(struct request_queue * q);
+
+/* Only changed by ubd_init, which is an initcall. */
+static int thread_fd = -1;
+static LIST_HEAD(restart);
+
+/* Function to read several request pointers at a time
+* handling fractional reads if (and as) needed
+*/
+
+static int bulk_req_safe_read(
+ int fd,
+ struct io_thread_req * (*request_buffer)[],
+ struct io_thread_req **remainder,
+ int *remainder_size,
+ int max_recs
+ )
+{
+ int n = 0;
+ int res = 0;
+
+ if (*remainder_size > 0) {
+ memmove(
+ (char *) request_buffer,
+ (char *) remainder, *remainder_size
+ );
+ n = *remainder_size;
+ }
+
+ res = os_read_file(
+ fd,
+ ((char *) request_buffer) + *remainder_size,
+ sizeof(struct io_thread_req *)*max_recs
+ - *remainder_size
+ );
+ if (res > 0) {
+ n += res;
+ if ((n % sizeof(struct io_thread_req *)) > 0) {
+ /*
+ * Read somehow returned not a multiple of dword
+ * theoretically possible, but never observed in the
+ * wild, so read routine must be able to handle it
+ */
+ *remainder_size = n % sizeof(struct io_thread_req *);
+ WARN(*remainder_size > 0, "UBD IPC read returned a partial result");
+ memmove(
+ remainder,
+ ((char *) request_buffer) +
+ (n/sizeof(struct io_thread_req *))*sizeof(struct io_thread_req *),
+ *remainder_size
+ );
+ n = n - *remainder_size;
+ }
+ } else {
+ n = res;
+ }
+ return n;
+}
+
+/* Called without dev->lock held, and only in interrupt context. */
+static void ubd_handler(void)
+{
+ struct ubd *ubd;
+ struct list_head *list, *next_ele;
+ unsigned long flags;
+ int n;
+ int count;
+
+ while(1){
+ n = bulk_req_safe_read(
+ thread_fd,
+ irq_req_buffer,
+ &irq_remainder,
+ &irq_remainder_size,
+ UBD_REQ_BUFFER_SIZE
+ );
+ if (n < 0) {
+ if(n == -EAGAIN)
+ break;
+ printk(KERN_ERR "spurious interrupt in ubd_handler, "
+ "err = %d\n", -n);
+ return;
+ }
+ for (count = 0; count < n/sizeof(struct io_thread_req *); count++) {
+ blk_end_request(
+ (*irq_req_buffer)[count]->req,
+ BLK_STS_OK,
+ (*irq_req_buffer)[count]->length
+ );
+ kfree((*irq_req_buffer)[count]);
+ }
+ }
+ reactivate_fd(thread_fd, UBD_IRQ);
+
+ list_for_each_safe(list, next_ele, &restart){
+ ubd = container_of(list, struct ubd, restart);
+ list_del_init(&ubd->restart);
+ spin_lock_irqsave(&ubd->lock, flags);
+ do_ubd_request(ubd->queue);
+ spin_unlock_irqrestore(&ubd->lock, flags);
+ }
+}
+
+static irqreturn_t ubd_intr(int irq, void *dev)
+{
+ ubd_handler();
+ return IRQ_HANDLED;
+}
+
+/* Only changed by ubd_init, which is an initcall. */
+static int io_pid = -1;
+
+static void kill_io_thread(void)
+{
+ if(io_pid != -1)
+ os_kill_process(io_pid, 1);
+}
+
+__uml_exitcall(kill_io_thread);
+
+static inline int ubd_file_size(struct ubd *ubd_dev, __u64 *size_out)
+{
+ char *file;
+ int fd;
+ int err;
+
+ __u32 version;
+ __u32 align;
+ char *backing_file;
+ time_t mtime;
+ unsigned long long size;
+ int sector_size;
+ int bitmap_offset;
+
+ if (ubd_dev->file && ubd_dev->cow.file) {
+ file = ubd_dev->cow.file;
+
+ goto out;
+ }
+
+ fd = os_open_file(ubd_dev->file, of_read(OPENFLAGS()), 0);
+ if (fd < 0)
+ return fd;
+
+ err = read_cow_header(file_reader, &fd, &version, &backing_file, \
+ &mtime, &size, §or_size, &align, &bitmap_offset);
+ os_close_file(fd);
+
+ if(err == -EINVAL)
+ file = ubd_dev->file;
+ else
+ file = backing_file;
+
+out:
+ return os_file_size(file, size_out);
+}
+
+static int read_cow_bitmap(int fd, void *buf, int offset, int len)
+{
+ int err;
+
+ err = os_pread_file(fd, buf, len, offset);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static int backing_file_mismatch(char *file, __u64 size, time_t mtime)
+{
+ unsigned long modtime;
+ unsigned long long actual;
+ int err;
+
+ err = os_file_modtime(file, &modtime);
+ if (err < 0) {
+ printk(KERN_ERR "Failed to get modification time of backing "
+ "file \"%s\", err = %d\n", file, -err);
+ return err;
+ }
+
+ err = os_file_size(file, &actual);
+ if (err < 0) {
+ printk(KERN_ERR "Failed to get size of backing file \"%s\", "
+ "err = %d\n", file, -err);
+ return err;
+ }
+
+ if (actual != size) {
+ /*__u64 can be a long on AMD64 and with %lu GCC complains; so
+ * the typecast.*/
+ printk(KERN_ERR "Size mismatch (%llu vs %llu) of COW header "
+ "vs backing file\n", (unsigned long long) size, actual);
+ return -EINVAL;
+ }
+ if (modtime != mtime) {
+ printk(KERN_ERR "mtime mismatch (%ld vs %ld) of COW header vs "
+ "backing file\n", mtime, modtime);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow)
+{
+ struct uml_stat buf1, buf2;
+ int err;
+
+ if (from_cmdline == NULL)
+ return 0;
+ if (!strcmp(from_cmdline, from_cow))
+ return 0;
+
+ err = os_stat_file(from_cmdline, &buf1);
+ if (err < 0) {
+ printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cmdline,
+ -err);
+ return 0;
+ }
+ err = os_stat_file(from_cow, &buf2);
+ if (err < 0) {
+ printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cow,
+ -err);
+ return 1;
+ }
+ if ((buf1.ust_dev == buf2.ust_dev) && (buf1.ust_ino == buf2.ust_ino))
+ return 0;
+
+ printk(KERN_ERR "Backing file mismatch - \"%s\" requested, "
+ "\"%s\" specified in COW header of \"%s\"\n",
+ from_cmdline, from_cow, cow);
+ return 1;
+}
+
+static int open_ubd_file(char *file, struct openflags *openflags, int shared,
+ char **backing_file_out, int *bitmap_offset_out,
+ unsigned long *bitmap_len_out, int *data_offset_out,
+ int *create_cow_out)
+{
+ time_t mtime;
+ unsigned long long size;
+ __u32 version, align;
+ char *backing_file;
+ int fd, err, sectorsize, asked_switch, mode = 0644;
+
+ fd = os_open_file(file, *openflags, mode);
+ if (fd < 0) {
+ if ((fd == -ENOENT) && (create_cow_out != NULL))
+ *create_cow_out = 1;
+ if (!openflags->w ||
+ ((fd != -EROFS) && (fd != -EACCES)))
+ return fd;
+ openflags->w = 0;
+ fd = os_open_file(file, *openflags, mode);
+ if (fd < 0)
+ return fd;
+ }
+
+ if (shared)
+ printk(KERN_INFO "Not locking \"%s\" on the host\n", file);
+ else {
+ err = os_lock_file(fd, openflags->w);
+ if (err < 0) {
+ printk(KERN_ERR "Failed to lock '%s', err = %d\n",
+ file, -err);
+ goto out_close;
+ }
+ }
+
+ /* Successful return case! */
+ if (backing_file_out == NULL)
+ return fd;
+
+ err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime,
+ &size, §orsize, &align, bitmap_offset_out);
+ if (err && (*backing_file_out != NULL)) {
+ printk(KERN_ERR "Failed to read COW header from COW file "
+ "\"%s\", errno = %d\n", file, -err);
+ goto out_close;
+ }
+ if (err)
+ return fd;
+
+ asked_switch = path_requires_switch(*backing_file_out, backing_file,
+ file);
+
+ /* Allow switching only if no mismatch. */
+ if (asked_switch && !backing_file_mismatch(*backing_file_out, size,
+ mtime)) {
+ printk(KERN_ERR "Switching backing file to '%s'\n",
+ *backing_file_out);
+ err = write_cow_header(file, fd, *backing_file_out,
+ sectorsize, align, &size);
+ if (err) {
+ printk(KERN_ERR "Switch failed, errno = %d\n", -err);
+ goto out_close;
+ }
+ } else {
+ *backing_file_out = backing_file;
+ err = backing_file_mismatch(*backing_file_out, size, mtime);
+ if (err)
+ goto out_close;
+ }
+
+ cow_sizes(version, size, sectorsize, align, *bitmap_offset_out,
+ bitmap_len_out, data_offset_out);
+
+ return fd;
+ out_close:
+ os_close_file(fd);
+ return err;
+}
+
+static int create_cow_file(char *cow_file, char *backing_file,
+ struct openflags flags,
+ int sectorsize, int alignment, int *bitmap_offset_out,
+ unsigned long *bitmap_len_out, int *data_offset_out)
+{
+ int err, fd;
+
+ flags.c = 1;
+ fd = open_ubd_file(cow_file, &flags, 0, NULL, NULL, NULL, NULL, NULL);
+ if (fd < 0) {
+ err = fd;
+ printk(KERN_ERR "Open of COW file '%s' failed, errno = %d\n",
+ cow_file, -err);
+ goto out;
+ }
+
+ err = init_cow_file(fd, cow_file, backing_file, sectorsize, alignment,
+ bitmap_offset_out, bitmap_len_out,
+ data_offset_out);
+ if (!err)
+ return fd;
+ os_close_file(fd);
+ out:
+ return err;
+}
+
+static void ubd_close_dev(struct ubd *ubd_dev)
+{
+ os_close_file(ubd_dev->fd);
+ if(ubd_dev->cow.file == NULL)
+ return;
+
+ os_close_file(ubd_dev->cow.fd);
+ vfree(ubd_dev->cow.bitmap);
+ ubd_dev->cow.bitmap = NULL;
+}
+
+static int ubd_open_dev(struct ubd *ubd_dev)
+{
+ struct openflags flags;
+ char **back_ptr;
+ int err, create_cow, *create_ptr;
+ int fd;
+
+ ubd_dev->openflags = ubd_dev->boot_openflags;
+ create_cow = 0;
+ create_ptr = (ubd_dev->cow.file != NULL) ? &create_cow : NULL;
+ back_ptr = ubd_dev->no_cow ? NULL : &ubd_dev->cow.file;
+
+ fd = open_ubd_file(ubd_dev->file, &ubd_dev->openflags, ubd_dev->shared,
+ back_ptr, &ubd_dev->cow.bitmap_offset,
+ &ubd_dev->cow.bitmap_len, &ubd_dev->cow.data_offset,
+ create_ptr);
+
+ if((fd == -ENOENT) && create_cow){
+ fd = create_cow_file(ubd_dev->file, ubd_dev->cow.file,
+ ubd_dev->openflags, 1 << 9, PAGE_SIZE,
+ &ubd_dev->cow.bitmap_offset,
+ &ubd_dev->cow.bitmap_len,
+ &ubd_dev->cow.data_offset);
+ if(fd >= 0){
+ printk(KERN_INFO "Creating \"%s\" as COW file for "
+ "\"%s\"\n", ubd_dev->file, ubd_dev->cow.file);
+ }
+ }
+
+ if(fd < 0){
+ printk("Failed to open '%s', errno = %d\n", ubd_dev->file,
+ -fd);
+ return fd;
+ }
+ ubd_dev->fd = fd;
+
+ if(ubd_dev->cow.file != NULL){
+ blk_queue_max_hw_sectors(ubd_dev->queue, 8 * sizeof(long));
+
+ err = -ENOMEM;
+ ubd_dev->cow.bitmap = vmalloc(ubd_dev->cow.bitmap_len);
+ if(ubd_dev->cow.bitmap == NULL){
+ printk(KERN_ERR "Failed to vmalloc COW bitmap\n");
+ goto error;
+ }
+ flush_tlb_kernel_vm();
+
+ err = read_cow_bitmap(ubd_dev->fd, ubd_dev->cow.bitmap,
+ ubd_dev->cow.bitmap_offset,
+ ubd_dev->cow.bitmap_len);
+ if(err < 0)
+ goto error;
+
+ flags = ubd_dev->openflags;
+ flags.w = 0;
+ err = open_ubd_file(ubd_dev->cow.file, &flags, ubd_dev->shared, NULL,
+ NULL, NULL, NULL, NULL);
+ if(err < 0) goto error;
+ ubd_dev->cow.fd = err;
+ }
+ return 0;
+ error:
+ os_close_file(ubd_dev->fd);
+ return err;
+}
+
+static void ubd_device_release(struct device *dev)
+{
+ struct ubd *ubd_dev = dev_get_drvdata(dev);
+
+ blk_cleanup_queue(ubd_dev->queue);
+ *ubd_dev = ((struct ubd) DEFAULT_UBD);
+}
+
+static int ubd_disk_register(int major, u64 size, int unit,
+ struct gendisk **disk_out)
+{
+ struct device *parent = NULL;
+ struct gendisk *disk;
+
+ disk = alloc_disk(1 << UBD_SHIFT);
+ if(disk == NULL)
+ return -ENOMEM;
+
+ disk->major = major;
+ disk->first_minor = unit << UBD_SHIFT;
+ disk->fops = &ubd_blops;
+ set_capacity(disk, size / 512);
+ if (major == UBD_MAJOR)
+ sprintf(disk->disk_name, "ubd%c", 'a' + unit);
+ else
+ sprintf(disk->disk_name, "ubd_fake%d", unit);
+
+ /* sysfs register (not for ide fake devices) */
+ if (major == UBD_MAJOR) {
+ ubd_devs[unit].pdev.id = unit;
+ ubd_devs[unit].pdev.name = DRIVER_NAME;
+ ubd_devs[unit].pdev.dev.release = ubd_device_release;
+ dev_set_drvdata(&ubd_devs[unit].pdev.dev, &ubd_devs[unit]);
+ platform_device_register(&ubd_devs[unit].pdev);
+ parent = &ubd_devs[unit].pdev.dev;
+ }
+
+ disk->private_data = &ubd_devs[unit];
+ disk->queue = ubd_devs[unit].queue;
+ device_add_disk(parent, disk);
+
+ *disk_out = disk;
+ return 0;
+}
+
+#define ROUND_BLOCK(n) ((n + ((1 << 9) - 1)) & (-1 << 9))
+
+static int ubd_add(int n, char **error_out)
+{
+ struct ubd *ubd_dev = &ubd_devs[n];
+ int err = 0;
+
+ if(ubd_dev->file == NULL)
+ goto out;
+
+ err = ubd_file_size(ubd_dev, &ubd_dev->size);
+ if(err < 0){
+ *error_out = "Couldn't determine size of device's file";
+ goto out;
+ }
+
+ ubd_dev->size = ROUND_BLOCK(ubd_dev->size);
+
+ INIT_LIST_HEAD(&ubd_dev->restart);
+ sg_init_table(ubd_dev->sg, MAX_SG);
+
+ err = -ENOMEM;
+ ubd_dev->queue = blk_init_queue(do_ubd_request, &ubd_dev->lock);
+ if (ubd_dev->queue == NULL) {
+ *error_out = "Failed to initialize device queue";
+ goto out;
+ }
+ ubd_dev->queue->queuedata = ubd_dev;
+ blk_queue_write_cache(ubd_dev->queue, true, false);
+
+ blk_queue_max_segments(ubd_dev->queue, MAX_SG);
+ err = ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, &ubd_gendisk[n]);
+ if(err){
+ *error_out = "Failed to register device";
+ goto out_cleanup;
+ }
+
+ if (fake_major != UBD_MAJOR)
+ ubd_disk_register(fake_major, ubd_dev->size, n,
+ &fake_gendisk[n]);
+
+ /*
+ * Perhaps this should also be under the "if (fake_major)" above
+ * using the fake_disk->disk_name
+ */
+ if (fake_ide)
+ make_ide_entries(ubd_gendisk[n]->disk_name);
+
+ err = 0;
+out:
+ return err;
+
+out_cleanup:
+ blk_cleanup_queue(ubd_dev->queue);
+ goto out;
+}
+
+static int ubd_config(char *str, char **error_out)
+{
+ int n, ret;
+
+ /* This string is possibly broken up and stored, so it's only
+ * freed if ubd_setup_common fails, or if only general options
+ * were set.
+ */
+ str = kstrdup(str, GFP_KERNEL);
+ if (str == NULL) {
+ *error_out = "Failed to allocate memory";
+ return -ENOMEM;
+ }
+
+ ret = ubd_setup_common(str, &n, error_out);
+ if (ret)
+ goto err_free;
+
+ if (n == -1) {
+ ret = 0;
+ goto err_free;
+ }
+
+ mutex_lock(&ubd_lock);
+ ret = ubd_add(n, error_out);
+ if (ret)
+ ubd_devs[n].file = NULL;
+ mutex_unlock(&ubd_lock);
+
+out:
+ return ret;
+
+err_free:
+ kfree(str);
+ goto out;
+}
+
+static int ubd_get_config(char *name, char *str, int size, char **error_out)
+{
+ struct ubd *ubd_dev;
+ int n, len = 0;
+
+ n = parse_unit(&name);
+ if((n >= MAX_DEV) || (n < 0)){
+ *error_out = "ubd_get_config : device number out of range";
+ return -1;
+ }
+
+ ubd_dev = &ubd_devs[n];
+ mutex_lock(&ubd_lock);
+
+ if(ubd_dev->file == NULL){
+ CONFIG_CHUNK(str, size, len, "", 1);
+ goto out;
+ }
+
+ CONFIG_CHUNK(str, size, len, ubd_dev->file, 0);
+
+ if(ubd_dev->cow.file != NULL){
+ CONFIG_CHUNK(str, size, len, ",", 0);
+ CONFIG_CHUNK(str, size, len, ubd_dev->cow.file, 1);
+ }
+ else CONFIG_CHUNK(str, size, len, "", 1);
+
+ out:
+ mutex_unlock(&ubd_lock);
+ return len;
+}
+
+static int ubd_id(char **str, int *start_out, int *end_out)
+{
+ int n;
+
+ n = parse_unit(str);
+ *start_out = 0;
+ *end_out = MAX_DEV - 1;
+ return n;
+}
+
+static int ubd_remove(int n, char **error_out)
+{
+ struct gendisk *disk = ubd_gendisk[n];
+ struct ubd *ubd_dev;
+ int err = -ENODEV;
+
+ mutex_lock(&ubd_lock);
+
+ ubd_dev = &ubd_devs[n];
+
+ if(ubd_dev->file == NULL)
+ goto out;
+
+ /* you cannot remove a open disk */
+ err = -EBUSY;
+ if(ubd_dev->count > 0)
+ goto out;
+
+ ubd_gendisk[n] = NULL;
+ if(disk != NULL){
+ del_gendisk(disk);
+ put_disk(disk);
+ }
+
+ if(fake_gendisk[n] != NULL){
+ del_gendisk(fake_gendisk[n]);
+ put_disk(fake_gendisk[n]);
+ fake_gendisk[n] = NULL;
+ }
+
+ err = 0;
+ platform_device_unregister(&ubd_dev->pdev);
+out:
+ mutex_unlock(&ubd_lock);
+ return err;
+}
+
+/* All these are called by mconsole in process context and without
+ * ubd-specific locks. The structure itself is const except for .list.
+ */
+static struct mc_device ubd_mc = {
+ .list = LIST_HEAD_INIT(ubd_mc.list),
+ .name = "ubd",
+ .config = ubd_config,
+ .get_config = ubd_get_config,
+ .id = ubd_id,
+ .remove = ubd_remove,
+};
+
+static int __init ubd_mc_init(void)
+{
+ mconsole_register_dev(&ubd_mc);
+ return 0;
+}
+
+__initcall(ubd_mc_init);
+
+static int __init ubd0_init(void)
+{
+ struct ubd *ubd_dev = &ubd_devs[0];
+
+ mutex_lock(&ubd_lock);
+ if(ubd_dev->file == NULL)
+ ubd_dev->file = "root_fs";
+ mutex_unlock(&ubd_lock);
+
+ return 0;
+}
+
+__initcall(ubd0_init);
+
+/* Used in ubd_init, which is an initcall */
+static struct platform_driver ubd_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+};
+
+static int __init ubd_init(void)
+{
+ char *error;
+ int i, err;
+
+ if (register_blkdev(UBD_MAJOR, "ubd"))
+ return -1;
+
+ if (fake_major != UBD_MAJOR) {
+ char name[sizeof("ubd_nnn\0")];
+
+ snprintf(name, sizeof(name), "ubd_%d", fake_major);
+ if (register_blkdev(fake_major, "ubd"))
+ return -1;
+ }
+
+ irq_req_buffer = kmalloc_array(UBD_REQ_BUFFER_SIZE,
+ sizeof(struct io_thread_req *),
+ GFP_KERNEL
+ );
+ irq_remainder = 0;
+
+ if (irq_req_buffer == NULL) {
+ printk(KERN_ERR "Failed to initialize ubd buffering\n");
+ return -1;
+ }
+ io_req_buffer = kmalloc_array(UBD_REQ_BUFFER_SIZE,
+ sizeof(struct io_thread_req *),
+ GFP_KERNEL
+ );
+
+ io_remainder = 0;
+
+ if (io_req_buffer == NULL) {
+ printk(KERN_ERR "Failed to initialize ubd buffering\n");
+ return -1;
+ }
+ platform_driver_register(&ubd_driver);
+ mutex_lock(&ubd_lock);
+ for (i = 0; i < MAX_DEV; i++){
+ err = ubd_add(i, &error);
+ if(err)
+ printk(KERN_ERR "Failed to initialize ubd device %d :"
+ "%s\n", i, error);
+ }
+ mutex_unlock(&ubd_lock);
+ return 0;
+}
+
+late_initcall(ubd_init);
+
+static int __init ubd_driver_init(void){
+ unsigned long stack;
+ int err;
+
+ /* Set by CONFIG_BLK_DEV_UBD_SYNC or ubd=sync.*/
+ if(global_openflags.s){
+ printk(KERN_INFO "ubd: Synchronous mode\n");
+ /* Letting ubd=sync be like using ubd#s= instead of ubd#= is
+ * enough. So use anyway the io thread. */
+ }
+ stack = alloc_stack(0, 0);
+ io_pid = start_io_thread(stack + PAGE_SIZE - sizeof(void *),
+ &thread_fd);
+ if(io_pid < 0){
+ printk(KERN_ERR
+ "ubd : Failed to start I/O thread (errno = %d) - "
+ "falling back to synchronous I/O\n", -io_pid);
+ io_pid = -1;
+ return 0;
+ }
+ err = um_request_irq(UBD_IRQ, thread_fd, IRQ_READ, ubd_intr,
+ 0, "ubd", ubd_devs);
+ if(err != 0)
+ printk(KERN_ERR "um_request_irq failed - errno = %d\n", -err);
+ return 0;
+}
+
+device_initcall(ubd_driver_init);
+
+static int ubd_open(struct block_device *bdev, fmode_t mode)
+{
+ struct gendisk *disk = bdev->bd_disk;
+ struct ubd *ubd_dev = disk->private_data;
+ int err = 0;
+
+ mutex_lock(&ubd_mutex);
+ if(ubd_dev->count == 0){
+ err = ubd_open_dev(ubd_dev);
+ if(err){
+ printk(KERN_ERR "%s: Can't open \"%s\": errno = %d\n",
+ disk->disk_name, ubd_dev->file, -err);
+ goto out;
+ }
+ }
+ ubd_dev->count++;
+ set_disk_ro(disk, !ubd_dev->openflags.w);
+
+ /* This should no more be needed. And it didn't work anyway to exclude
+ * read-write remounting of filesystems.*/
+ /*if((mode & FMODE_WRITE) && !ubd_dev->openflags.w){
+ if(--ubd_dev->count == 0) ubd_close_dev(ubd_dev);
+ err = -EROFS;
+ }*/
+out:
+ mutex_unlock(&ubd_mutex);
+ return err;
+}
+
+static void ubd_release(struct gendisk *disk, fmode_t mode)
+{
+ struct ubd *ubd_dev = disk->private_data;
+
+ mutex_lock(&ubd_mutex);
+ if(--ubd_dev->count == 0)
+ ubd_close_dev(ubd_dev);
+ mutex_unlock(&ubd_mutex);
+}
+
+static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask,
+ __u64 *cow_offset, unsigned long *bitmap,
+ __u64 bitmap_offset, unsigned long *bitmap_words,
+ __u64 bitmap_len)
+{
+ __u64 sector = io_offset >> 9;
+ int i, update_bitmap = 0;
+
+ for(i = 0; i < length >> 9; i++){
+ if(cow_mask != NULL)
+ ubd_set_bit(i, (unsigned char *) cow_mask);
+ if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
+ continue;
+
+ update_bitmap = 1;
+ ubd_set_bit(sector + i, (unsigned char *) bitmap);
+ }
+
+ if(!update_bitmap)
+ return;
+
+ *cow_offset = sector / (sizeof(unsigned long) * 8);
+
+ /* This takes care of the case where we're exactly at the end of the
+ * device, and *cow_offset + 1 is off the end. So, just back it up
+ * by one word. Thanks to Lynn Kerby for the fix and James McMechan
+ * for the original diagnosis.
+ */
+ if (*cow_offset == (DIV_ROUND_UP(bitmap_len,
+ sizeof(unsigned long)) - 1))
+ (*cow_offset)--;
+
+ bitmap_words[0] = bitmap[*cow_offset];
+ bitmap_words[1] = bitmap[*cow_offset + 1];
+
+ *cow_offset *= sizeof(unsigned long);
+ *cow_offset += bitmap_offset;
+}
+
+static void cowify_req(struct io_thread_req *req, unsigned long *bitmap,
+ __u64 bitmap_offset, __u64 bitmap_len)
+{
+ __u64 sector = req->offset >> 9;
+ int i;
+
+ if(req->length > (sizeof(req->sector_mask) * 8) << 9)
+ panic("Operation too long");
+
+ if(req->op == UBD_READ) {
+ for(i = 0; i < req->length >> 9; i++){
+ if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
+ ubd_set_bit(i, (unsigned char *)
+ &req->sector_mask);
+ }
+ }
+ else cowify_bitmap(req->offset, req->length, &req->sector_mask,
+ &req->cow_offset, bitmap, bitmap_offset,
+ req->bitmap_words, bitmap_len);
+}
+
+/* Called with dev->lock held */
+static void prepare_request(struct request *req, struct io_thread_req *io_req,
+ unsigned long long offset, int page_offset,
+ int len, struct page *page)
+{
+ struct gendisk *disk = req->rq_disk;
+ struct ubd *ubd_dev = disk->private_data;
+
+ io_req->req = req;
+ io_req->fds[0] = (ubd_dev->cow.file != NULL) ? ubd_dev->cow.fd :
+ ubd_dev->fd;
+ io_req->fds[1] = ubd_dev->fd;
+ io_req->cow_offset = -1;
+ io_req->offset = offset;
+ io_req->length = len;
+ io_req->error = 0;
+ io_req->sector_mask = 0;
+
+ io_req->op = (rq_data_dir(req) == READ) ? UBD_READ : UBD_WRITE;
+ io_req->offsets[0] = 0;
+ io_req->offsets[1] = ubd_dev->cow.data_offset;
+ io_req->buffer = page_address(page) + page_offset;
+ io_req->sectorsize = 1 << 9;
+
+ if(ubd_dev->cow.file != NULL)
+ cowify_req(io_req, ubd_dev->cow.bitmap,
+ ubd_dev->cow.bitmap_offset, ubd_dev->cow.bitmap_len);
+
+}
+
+/* Called with dev->lock held */
+static void prepare_flush_request(struct request *req,
+ struct io_thread_req *io_req)
+{
+ struct gendisk *disk = req->rq_disk;
+ struct ubd *ubd_dev = disk->private_data;
+
+ io_req->req = req;
+ io_req->fds[0] = (ubd_dev->cow.file != NULL) ? ubd_dev->cow.fd :
+ ubd_dev->fd;
+ io_req->op = UBD_FLUSH;
+}
+
+static bool submit_request(struct io_thread_req *io_req, struct ubd *dev)
+{
+ int n = os_write_file(thread_fd, &io_req,
+ sizeof(io_req));
+ if (n != sizeof(io_req)) {
+ if (n != -EAGAIN)
+ printk("write to io thread failed, "
+ "errno = %d\n", -n);
+ else if (list_empty(&dev->restart))
+ list_add(&dev->restart, &restart);
+
+ kfree(io_req);
+ return false;
+ }
+ return true;
+}
+
+/* Called with dev->lock held */
+static void do_ubd_request(struct request_queue *q)
+{
+ struct io_thread_req *io_req;
+ struct request *req;
+
+ while(1){
+ struct ubd *dev = q->queuedata;
+ if(dev->request == NULL){
+ struct request *req = blk_fetch_request(q);
+ if(req == NULL)
+ return;
+
+ dev->request = req;
+ dev->rq_pos = blk_rq_pos(req);
+ dev->start_sg = 0;
+ dev->end_sg = blk_rq_map_sg(q, req, dev->sg);
+ }
+
+ req = dev->request;
+
+ if (req_op(req) == REQ_OP_FLUSH) {
+ io_req = kmalloc(sizeof(struct io_thread_req),
+ GFP_ATOMIC);
+ if (io_req == NULL) {
+ if (list_empty(&dev->restart))
+ list_add(&dev->restart, &restart);
+ return;
+ }
+ prepare_flush_request(req, io_req);
+ if (submit_request(io_req, dev) == false)
+ return;
+ }
+
+ while(dev->start_sg < dev->end_sg){
+ struct scatterlist *sg = &dev->sg[dev->start_sg];
+
+ io_req = kmalloc(sizeof(struct io_thread_req),
+ GFP_ATOMIC);
+ if(io_req == NULL){
+ if(list_empty(&dev->restart))
+ list_add(&dev->restart, &restart);
+ return;
+ }
+ prepare_request(req, io_req,
+ (unsigned long long)dev->rq_pos << 9,
+ sg->offset, sg->length, sg_page(sg));
+
+ if (submit_request(io_req, dev) == false)
+ return;
+
+ dev->rq_pos += sg->length >> 9;
+ dev->start_sg++;
+ }
+ dev->end_sg = 0;
+ dev->request = NULL;
+ }
+}
+
+static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+ struct ubd *ubd_dev = bdev->bd_disk->private_data;
+
+ geo->heads = 128;
+ geo->sectors = 32;
+ geo->cylinders = ubd_dev->size / (128 * 32 * 512);
+ return 0;
+}
+
+static int ubd_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ struct ubd *ubd_dev = bdev->bd_disk->private_data;
+ u16 ubd_id[ATA_ID_WORDS];
+
+ switch (cmd) {
+ struct cdrom_volctrl volume;
+ case HDIO_GET_IDENTITY:
+ memset(&ubd_id, 0, ATA_ID_WORDS * 2);
+ ubd_id[ATA_ID_CYLS] = ubd_dev->size / (128 * 32 * 512);
+ ubd_id[ATA_ID_HEADS] = 128;
+ ubd_id[ATA_ID_SECTORS] = 32;
+ if(copy_to_user((char __user *) arg, (char *) &ubd_id,
+ sizeof(ubd_id)))
+ return -EFAULT;
+ return 0;
+
+ case CDROMVOLREAD:
+ if(copy_from_user(&volume, (char __user *) arg, sizeof(volume)))
+ return -EFAULT;
+ volume.channel0 = 255;
+ volume.channel1 = 255;
+ volume.channel2 = 255;
+ volume.channel3 = 255;
+ if(copy_to_user((char __user *) arg, &volume, sizeof(volume)))
+ return -EFAULT;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static int update_bitmap(struct io_thread_req *req)
+{
+ int n;
+
+ if(req->cow_offset == -1)
+ return 0;
+
+ n = os_pwrite_file(req->fds[1], &req->bitmap_words,
+ sizeof(req->bitmap_words), req->cow_offset);
+ if(n != sizeof(req->bitmap_words)){
+ printk("do_io - bitmap update failed, err = %d fd = %d\n", -n,
+ req->fds[1]);
+ return 1;
+ }
+
+ return 0;
+}
+
+static void do_io(struct io_thread_req *req)
+{
+ char *buf;
+ unsigned long len;
+ int n, nsectors, start, end, bit;
+ __u64 off;
+
+ if (req->op == UBD_FLUSH) {
+ /* fds[0] is always either the rw image or our cow file */
+ n = os_sync_file(req->fds[0]);
+ if (n != 0) {
+ printk("do_io - sync failed err = %d "
+ "fd = %d\n", -n, req->fds[0]);
+ req->error = 1;
+ }
+ return;
+ }
+
+ nsectors = req->length / req->sectorsize;
+ start = 0;
+ do {
+ bit = ubd_test_bit(start, (unsigned char *) &req->sector_mask);
+ end = start;
+ while((end < nsectors) &&
+ (ubd_test_bit(end, (unsigned char *)
+ &req->sector_mask) == bit))
+ end++;
+
+ off = req->offset + req->offsets[bit] +
+ start * req->sectorsize;
+ len = (end - start) * req->sectorsize;
+ buf = &req->buffer[start * req->sectorsize];
+
+ if(req->op == UBD_READ){
+ n = 0;
+ do {
+ buf = &buf[n];
+ len -= n;
+ n = os_pread_file(req->fds[bit], buf, len, off);
+ if (n < 0) {
+ printk("do_io - read failed, err = %d "
+ "fd = %d\n", -n, req->fds[bit]);
+ req->error = 1;
+ return;
+ }
+ } while((n < len) && (n != 0));
+ if (n < len) memset(&buf[n], 0, len - n);
+ } else {
+ n = os_pwrite_file(req->fds[bit], buf, len, off);
+ if(n != len){
+ printk("do_io - write failed err = %d "
+ "fd = %d\n", -n, req->fds[bit]);
+ req->error = 1;
+ return;
+ }
+ }
+
+ start = end;
+ } while(start < nsectors);
+
+ req->error = update_bitmap(req);
+}
+
+/* Changed in start_io_thread, which is serialized by being called only
+ * from ubd_init, which is an initcall.
+ */
+int kernel_fd = -1;
+
+/* Only changed by the io thread. XXX: currently unused. */
+static int io_count = 0;
+
+int io_thread(void *arg)
+{
+ int n, count, written, res;
+
+ os_fix_helper_signals();
+
+ while(1){
+ n = bulk_req_safe_read(
+ kernel_fd,
+ io_req_buffer,
+ &io_remainder,
+ &io_remainder_size,
+ UBD_REQ_BUFFER_SIZE
+ );
+ if (n < 0) {
+ if (n == -EAGAIN) {
+ ubd_read_poll(-1);
+ continue;
+ } else {
+ printk("io_thread - read failed, fd = %d, "
+ "err = %d,"
+ "reminder = %d\n",
+ kernel_fd, -n, io_remainder_size);
+ }
+ }
+
+ for (count = 0; count < n/sizeof(struct io_thread_req *); count++) {
+ io_count++;
+ do_io((*io_req_buffer)[count]);
+ }
+
+ written = 0;
+
+ do {
+ res = os_write_file(kernel_fd, ((char *) io_req_buffer) + written, n);
+ if (res >= 0) {
+ written += res;
+ } else {
+ if (res != -EAGAIN) {
+ printk("io_thread - write failed, fd = %d, "
+ "err = %d\n", kernel_fd, -n);
+ }
+ }
+ if (written < n) {
+ ubd_write_poll(-1);
+ }
+ } while (written < n);
+ }
+
+ return 0;
+}
diff --git a/arch/um/drivers/ubd_user.c b/arch/um/drivers/ubd_user.c
new file mode 100644
index 0000000..6f74479
--- /dev/null
+++ b/arch/um/drivers/ubd_user.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2016 Anton Ivanov (aivanov@brocade.com)
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2001 Ridgerun,Inc (glonnon@ridgerun.com)
+ * Licensed under the GPL
+ */
+
+#include <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sched.h>
+#include <signal.h>
+#include <string.h>
+#include <netinet/in.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <sys/mman.h>
+#include <sys/param.h>
+#include <endian.h>
+#include <byteswap.h>
+
+#include "ubd.h"
+#include <os.h>
+#include <poll.h>
+
+struct pollfd kernel_pollfd;
+
+int start_io_thread(unsigned long sp, int *fd_out)
+{
+ int pid, fds[2], err;
+
+ err = os_pipe(fds, 1, 1);
+ if(err < 0){
+ printk("start_io_thread - os_pipe failed, err = %d\n", -err);
+ goto out;
+ }
+
+ kernel_fd = fds[0];
+ kernel_pollfd.fd = kernel_fd;
+ kernel_pollfd.events = POLLIN;
+ *fd_out = fds[1];
+
+ err = os_set_fd_block(*fd_out, 0);
+ err = os_set_fd_block(kernel_fd, 0);
+ if (err) {
+ printk("start_io_thread - failed to set nonblocking I/O.\n");
+ goto out_close;
+ }
+
+ pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL);
+ if(pid < 0){
+ err = -errno;
+ printk("start_io_thread - clone failed : errno = %d\n", errno);
+ goto out_close;
+ }
+
+ return(pid);
+
+ out_close:
+ os_close_file(fds[0]);
+ os_close_file(fds[1]);
+ kernel_fd = -1;
+ *fd_out = -1;
+ out:
+ return err;
+}
+
+int ubd_read_poll(int timeout)
+{
+ kernel_pollfd.events = POLLIN;
+ return poll(&kernel_pollfd, 1, timeout);
+}
+int ubd_write_poll(int timeout)
+{
+ kernel_pollfd.events = POLLOUT;
+ return poll(&kernel_pollfd, 1, timeout);
+}
+
diff --git a/arch/um/drivers/umcast.h b/arch/um/drivers/umcast.h
new file mode 100644
index 0000000..c190c64
--- /dev/null
+++ b/arch/um/drivers/umcast.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __DRIVERS_UMCAST_H
+#define __DRIVERS_UMCAST_H
+
+#include <net_user.h>
+
+struct umcast_data {
+ char *addr;
+ unsigned short lport;
+ unsigned short rport;
+ void *listen_addr;
+ void *remote_addr;
+ int ttl;
+ int unicast;
+ void *dev;
+};
+
+extern const struct net_user_info umcast_user_info;
+
+extern int umcast_user_write(int fd, void *buf, int len,
+ struct umcast_data *pri);
+
+#endif
diff --git a/arch/um/drivers/umcast_kern.c b/arch/um/drivers/umcast_kern.c
new file mode 100644
index 0000000..f5ba6e3
--- /dev/null
+++ b/arch/um/drivers/umcast_kern.c
@@ -0,0 +1,188 @@
+/*
+ * user-mode-linux networking multicast transport
+ * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ *
+ * based on the existing uml-networking code, which is
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ *
+ * Licensed under the GPL.
+ */
+
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include "umcast.h"
+#include <net_kern.h>
+
+struct umcast_init {
+ char *addr;
+ int lport;
+ int rport;
+ int ttl;
+ bool unicast;
+};
+
+static void umcast_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *pri;
+ struct umcast_data *dpri;
+ struct umcast_init *init = data;
+
+ pri = netdev_priv(dev);
+ dpri = (struct umcast_data *) pri->user;
+ dpri->addr = init->addr;
+ dpri->lport = init->lport;
+ dpri->rport = init->rport;
+ dpri->unicast = init->unicast;
+ dpri->ttl = init->ttl;
+ dpri->dev = dev;
+
+ if (dpri->unicast) {
+ printk(KERN_INFO "ucast backend address: %s:%u listen port: "
+ "%u\n", dpri->addr, dpri->rport, dpri->lport);
+ } else {
+ printk(KERN_INFO "mcast backend multicast address: %s:%u, "
+ "TTL:%u\n", dpri->addr, dpri->lport, dpri->ttl);
+ }
+}
+
+static int umcast_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return net_recvfrom(fd, skb_mac_header(skb),
+ skb->dev->mtu + ETH_HEADER_OTHER);
+}
+
+static int umcast_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return umcast_user_write(fd, skb->data, skb->len,
+ (struct umcast_data *) &lp->user);
+}
+
+static const struct net_kern_info umcast_kern_info = {
+ .init = umcast_init,
+ .protocol = eth_protocol,
+ .read = umcast_read,
+ .write = umcast_write,
+};
+
+static int mcast_setup(char *str, char **mac_out, void *data)
+{
+ struct umcast_init *init = data;
+ char *port_str = NULL, *ttl_str = NULL, *remain;
+ char *last;
+
+ *init = ((struct umcast_init)
+ { .addr = "239.192.168.1",
+ .lport = 1102,
+ .ttl = 1 });
+
+ remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str,
+ NULL);
+ if (remain != NULL) {
+ printk(KERN_ERR "mcast_setup - Extra garbage on "
+ "specification : '%s'\n", remain);
+ return 0;
+ }
+
+ if (port_str != NULL) {
+ init->lport = simple_strtoul(port_str, &last, 10);
+ if ((*last != '\0') || (last == port_str)) {
+ printk(KERN_ERR "mcast_setup - Bad port : '%s'\n",
+ port_str);
+ return 0;
+ }
+ }
+
+ if (ttl_str != NULL) {
+ init->ttl = simple_strtoul(ttl_str, &last, 10);
+ if ((*last != '\0') || (last == ttl_str)) {
+ printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n",
+ ttl_str);
+ return 0;
+ }
+ }
+
+ init->unicast = false;
+ init->rport = init->lport;
+
+ printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
+ init->lport, init->ttl);
+
+ return 1;
+}
+
+static int ucast_setup(char *str, char **mac_out, void *data)
+{
+ struct umcast_init *init = data;
+ char *lport_str = NULL, *rport_str = NULL, *remain;
+ char *last;
+
+ *init = ((struct umcast_init)
+ { .addr = "",
+ .lport = 1102,
+ .rport = 1102 });
+
+ remain = split_if_spec(str, mac_out, &init->addr,
+ &lport_str, &rport_str, NULL);
+ if (remain != NULL) {
+ printk(KERN_ERR "ucast_setup - Extra garbage on "
+ "specification : '%s'\n", remain);
+ return 0;
+ }
+
+ if (lport_str != NULL) {
+ init->lport = simple_strtoul(lport_str, &last, 10);
+ if ((*last != '\0') || (last == lport_str)) {
+ printk(KERN_ERR "ucast_setup - Bad listen port : "
+ "'%s'\n", lport_str);
+ return 0;
+ }
+ }
+
+ if (rport_str != NULL) {
+ init->rport = simple_strtoul(rport_str, &last, 10);
+ if ((*last != '\0') || (last == rport_str)) {
+ printk(KERN_ERR "ucast_setup - Bad remote port : "
+ "'%s'\n", rport_str);
+ return 0;
+ }
+ }
+
+ init->unicast = true;
+
+ printk(KERN_INFO "Configured ucast device: :%u -> %s:%u\n",
+ init->lport, init->addr, init->rport);
+
+ return 1;
+}
+
+static struct transport mcast_transport = {
+ .list = LIST_HEAD_INIT(mcast_transport.list),
+ .name = "mcast",
+ .setup = mcast_setup,
+ .user = &umcast_user_info,
+ .kern = &umcast_kern_info,
+ .private_size = sizeof(struct umcast_data),
+ .setup_size = sizeof(struct umcast_init),
+};
+
+static struct transport ucast_transport = {
+ .list = LIST_HEAD_INIT(ucast_transport.list),
+ .name = "ucast",
+ .setup = ucast_setup,
+ .user = &umcast_user_info,
+ .kern = &umcast_kern_info,
+ .private_size = sizeof(struct umcast_data),
+ .setup_size = sizeof(struct umcast_init),
+};
+
+static int register_umcast(void)
+{
+ register_transport(&mcast_transport);
+ register_transport(&ucast_transport);
+ return 0;
+}
+
+late_initcall(register_umcast);
diff --git a/arch/um/drivers/umcast_user.c b/arch/um/drivers/umcast_user.c
new file mode 100644
index 0000000..6074184
--- /dev/null
+++ b/arch/um/drivers/umcast_user.c
@@ -0,0 +1,184 @@
+/*
+ * user-mode-linux networking multicast transport
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
+ *
+ * based on the existing uml-networking code, which is
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ *
+ * Licensed under the GPL.
+ *
+ */
+
+#include <unistd.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include "umcast.h"
+#include <net_user.h>
+#include <um_malloc.h>
+
+static struct sockaddr_in *new_addr(char *addr, unsigned short port)
+{
+ struct sockaddr_in *sin;
+
+ sin = uml_kmalloc(sizeof(struct sockaddr_in), UM_GFP_KERNEL);
+ if (sin == NULL) {
+ printk(UM_KERN_ERR "new_addr: allocation of sockaddr_in "
+ "failed\n");
+ return NULL;
+ }
+ sin->sin_family = AF_INET;
+ if (addr)
+ sin->sin_addr.s_addr = in_aton(addr);
+ else
+ sin->sin_addr.s_addr = INADDR_ANY;
+ sin->sin_port = htons(port);
+ return sin;
+}
+
+static int umcast_user_init(void *data, void *dev)
+{
+ struct umcast_data *pri = data;
+
+ pri->remote_addr = new_addr(pri->addr, pri->rport);
+ if (pri->unicast)
+ pri->listen_addr = new_addr(NULL, pri->lport);
+ else
+ pri->listen_addr = pri->remote_addr;
+ pri->dev = dev;
+ return 0;
+}
+
+static void umcast_remove(void *data)
+{
+ struct umcast_data *pri = data;
+
+ kfree(pri->listen_addr);
+ if (pri->unicast)
+ kfree(pri->remote_addr);
+ pri->listen_addr = pri->remote_addr = NULL;
+}
+
+static int umcast_open(void *data)
+{
+ struct umcast_data *pri = data;
+ struct sockaddr_in *lsin = pri->listen_addr;
+ struct sockaddr_in *rsin = pri->remote_addr;
+ struct ip_mreq mreq;
+ int fd, yes = 1, err = -EINVAL;
+
+
+ if ((!pri->unicast && lsin->sin_addr.s_addr == 0) ||
+ (rsin->sin_addr.s_addr == 0) ||
+ (lsin->sin_port == 0) || (rsin->sin_port == 0))
+ goto out;
+
+ fd = socket(AF_INET, SOCK_DGRAM, 0);
+
+ if (fd < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "umcast_open : data socket failed, "
+ "errno = %d\n", errno);
+ goto out;
+ }
+
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "umcast_open: SO_REUSEADDR failed, "
+ "errno = %d\n", errno);
+ goto out_close;
+ }
+
+ if (!pri->unicast) {
+ /* set ttl according to config */
+ if (setsockopt(fd, SOL_IP, IP_MULTICAST_TTL, &pri->ttl,
+ sizeof(pri->ttl)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "umcast_open: IP_MULTICAST_TTL "
+ "failed, error = %d\n", errno);
+ goto out_close;
+ }
+
+ /* set LOOP, so data does get fed back to local sockets */
+ if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP,
+ &yes, sizeof(yes)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "umcast_open: IP_MULTICAST_LOOP "
+ "failed, error = %d\n", errno);
+ goto out_close;
+ }
+ }
+
+ /* bind socket to the address */
+ if (bind(fd, (struct sockaddr *) lsin, sizeof(*lsin)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "umcast_open : data bind failed, "
+ "errno = %d\n", errno);
+ goto out_close;
+ }
+
+ if (!pri->unicast) {
+ /* subscribe to the multicast group */
+ mreq.imr_multiaddr.s_addr = lsin->sin_addr.s_addr;
+ mreq.imr_interface.s_addr = 0;
+ if (setsockopt(fd, SOL_IP, IP_ADD_MEMBERSHIP,
+ &mreq, sizeof(mreq)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "umcast_open: IP_ADD_MEMBERSHIP "
+ "failed, error = %d\n", errno);
+ printk(UM_KERN_ERR "There appears not to be a "
+ "multicast-capable network interface on the "
+ "host.\n");
+ printk(UM_KERN_ERR "eth0 should be configured in order "
+ "to use the multicast transport.\n");
+ goto out_close;
+ }
+ }
+
+ return fd;
+
+ out_close:
+ close(fd);
+ out:
+ return err;
+}
+
+static void umcast_close(int fd, void *data)
+{
+ struct umcast_data *pri = data;
+
+ if (!pri->unicast) {
+ struct ip_mreq mreq;
+ struct sockaddr_in *lsin = pri->listen_addr;
+
+ mreq.imr_multiaddr.s_addr = lsin->sin_addr.s_addr;
+ mreq.imr_interface.s_addr = 0;
+ if (setsockopt(fd, SOL_IP, IP_DROP_MEMBERSHIP,
+ &mreq, sizeof(mreq)) < 0) {
+ printk(UM_KERN_ERR "umcast_close: IP_DROP_MEMBERSHIP "
+ "failed, error = %d\n", errno);
+ }
+ }
+
+ close(fd);
+}
+
+int umcast_user_write(int fd, void *buf, int len, struct umcast_data *pri)
+{
+ struct sockaddr_in *data_addr = pri->remote_addr;
+
+ return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
+}
+
+const struct net_user_info umcast_user_info = {
+ .init = umcast_user_init,
+ .open = umcast_open,
+ .close = umcast_close,
+ .remove = umcast_remove,
+ .add_address = NULL,
+ .delete_address = NULL,
+ .mtu = ETH_MAX_PACKET,
+ .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
+};
diff --git a/arch/um/drivers/vde.h b/arch/um/drivers/vde.h
new file mode 100644
index 0000000..fc3a059
--- /dev/null
+++ b/arch/um/drivers/vde.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
+ * Licensed under the GPL.
+ */
+
+#ifndef __UM_VDE_H__
+#define __UM_VDE_H__
+
+struct vde_data {
+ char *vde_switch;
+ char *descr;
+ void *args;
+ void *conn;
+ void *dev;
+};
+
+struct vde_init {
+ char *vde_switch;
+ char *descr;
+ int port;
+ char *group;
+ int mode;
+};
+
+extern const struct net_user_info vde_user_info;
+
+extern void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init);
+
+extern int vde_user_read(void *conn, void *buf, int len);
+extern int vde_user_write(void *conn, void *buf, int len);
+
+#endif
diff --git a/arch/um/drivers/vde_kern.c b/arch/um/drivers/vde_kern.c
new file mode 100644
index 0000000..6a365fa
--- /dev/null
+++ b/arch/um/drivers/vde_kern.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
+ * Licensed under the GPL.
+ *
+ * Transport usage:
+ * ethN=vde,<vde_switch>,<mac addr>,<port>,<group>,<mode>,<description>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <net_kern.h>
+#include <net_user.h>
+#include "vde.h"
+
+static void vde_init(struct net_device *dev, void *data)
+{
+ struct vde_init *init = data;
+ struct uml_net_private *pri;
+ struct vde_data *vpri;
+
+ pri = netdev_priv(dev);
+ vpri = (struct vde_data *) pri->user;
+
+ vpri->vde_switch = init->vde_switch;
+ vpri->descr = init->descr ? init->descr : "UML vde_transport";
+ vpri->args = NULL;
+ vpri->conn = NULL;
+ vpri->dev = dev;
+
+ printk("vde backend - %s, ", vpri->vde_switch ?
+ vpri->vde_switch : "(default socket)");
+
+ vde_init_libstuff(vpri, init);
+
+ printk("\n");
+}
+
+static int vde_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ struct vde_data *pri = (struct vde_data *) &lp->user;
+
+ if (pri->conn != NULL)
+ return vde_user_read(pri->conn, skb_mac_header(skb),
+ skb->dev->mtu + ETH_HEADER_OTHER);
+
+ printk(KERN_ERR "vde_read - we have no VDECONN to read from");
+ return -EBADF;
+}
+
+static int vde_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ struct vde_data *pri = (struct vde_data *) &lp->user;
+
+ if (pri->conn != NULL)
+ return vde_user_write((void *)pri->conn, skb->data,
+ skb->len);
+
+ printk(KERN_ERR "vde_write - we have no VDECONN to write to");
+ return -EBADF;
+}
+
+static const struct net_kern_info vde_kern_info = {
+ .init = vde_init,
+ .protocol = eth_protocol,
+ .read = vde_read,
+ .write = vde_write,
+};
+
+static int vde_setup(char *str, char **mac_out, void *data)
+{
+ struct vde_init *init = data;
+ char *remain, *port_str = NULL, *mode_str = NULL, *last;
+
+ *init = ((struct vde_init)
+ { .vde_switch = NULL,
+ .descr = NULL,
+ .port = 0,
+ .group = NULL,
+ .mode = 0 });
+
+ remain = split_if_spec(str, &init->vde_switch, mac_out, &port_str,
+ &init->group, &mode_str, &init->descr, NULL);
+
+ if (remain != NULL)
+ printk(KERN_WARNING "vde_setup - Ignoring extra data :"
+ "'%s'\n", remain);
+
+ if (port_str != NULL) {
+ init->port = simple_strtoul(port_str, &last, 10);
+ if ((*last != '\0') || (last == port_str)) {
+ printk(KERN_ERR "vde_setup - Bad port : '%s'\n",
+ port_str);
+ return 0;
+ }
+ }
+
+ if (mode_str != NULL) {
+ init->mode = simple_strtoul(mode_str, &last, 8);
+ if ((*last != '\0') || (last == mode_str)) {
+ printk(KERN_ERR "vde_setup - Bad mode : '%s'\n",
+ mode_str);
+ return 0;
+ }
+ }
+
+ printk(KERN_INFO "Configured vde device: %s\n", init->vde_switch ?
+ init->vde_switch : "(default socket)");
+
+ return 1;
+}
+
+static struct transport vde_transport = {
+ .list = LIST_HEAD_INIT(vde_transport.list),
+ .name = "vde",
+ .setup = vde_setup,
+ .user = &vde_user_info,
+ .kern = &vde_kern_info,
+ .private_size = sizeof(struct vde_data),
+ .setup_size = sizeof(struct vde_init),
+};
+
+static int register_vde(void)
+{
+ register_transport(&vde_transport);
+ return 0;
+}
+
+late_initcall(register_vde);
diff --git a/arch/um/drivers/vde_user.c b/arch/um/drivers/vde_user.c
new file mode 100644
index 0000000..64cb630
--- /dev/null
+++ b/arch/um/drivers/vde_user.c
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
+ * Licensed under the GPL.
+ */
+
+#include <stddef.h>
+#include <errno.h>
+#include <libvdeplug.h>
+#include <net_user.h>
+#include <um_malloc.h>
+#include "vde.h"
+
+static int vde_user_init(void *data, void *dev)
+{
+ struct vde_data *pri = data;
+ VDECONN *conn = NULL;
+ int err = -EINVAL;
+
+ pri->dev = dev;
+
+ conn = vde_open(pri->vde_switch, pri->descr, pri->args);
+
+ if (conn == NULL) {
+ err = -errno;
+ printk(UM_KERN_ERR "vde_user_init: vde_open failed, "
+ "errno = %d\n", errno);
+ return err;
+ }
+
+ printk(UM_KERN_INFO "vde backend - connection opened\n");
+
+ pri->conn = conn;
+
+ return 0;
+}
+
+static int vde_user_open(void *data)
+{
+ struct vde_data *pri = data;
+
+ if (pri->conn != NULL)
+ return vde_datafd(pri->conn);
+
+ printk(UM_KERN_WARNING "vde_open - we have no VDECONN to open");
+ return -EINVAL;
+}
+
+static void vde_remove(void *data)
+{
+ struct vde_data *pri = data;
+
+ if (pri->conn != NULL) {
+ printk(UM_KERN_INFO "vde backend - closing connection\n");
+ vde_close(pri->conn);
+ pri->conn = NULL;
+ kfree(pri->args);
+ pri->args = NULL;
+ return;
+ }
+
+ printk(UM_KERN_WARNING "vde_remove - we have no VDECONN to remove");
+}
+
+const struct net_user_info vde_user_info = {
+ .init = vde_user_init,
+ .open = vde_user_open,
+ .close = NULL,
+ .remove = vde_remove,
+ .add_address = NULL,
+ .delete_address = NULL,
+ .mtu = ETH_MAX_PACKET,
+ .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
+};
+
+void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init)
+{
+ struct vde_open_args *args;
+
+ vpri->args = uml_kmalloc(sizeof(struct vde_open_args), UM_GFP_KERNEL);
+ if (vpri->args == NULL) {
+ printk(UM_KERN_ERR "vde_init_libstuff - vde_open_args "
+ "allocation failed");
+ return;
+ }
+
+ args = vpri->args;
+
+ args->port = init->port;
+ args->group = init->group;
+ args->mode = init->mode ? init->mode : 0700;
+
+ args->port ? printk("port %d", args->port) :
+ printk("undefined port");
+}
+
+int vde_user_read(void *conn, void *buf, int len)
+{
+ VDECONN *vconn = conn;
+ int rv;
+
+ if (vconn == NULL)
+ return 0;
+
+ rv = vde_recv(vconn, buf, len, 0);
+ if (rv < 0) {
+ if (errno == EAGAIN)
+ return 0;
+ return -errno;
+ }
+ else if (rv == 0)
+ return -ENOTCONN;
+
+ return rv;
+}
+
+int vde_user_write(void *conn, void *buf, int len)
+{
+ VDECONN *vconn = conn;
+
+ if (vconn == NULL)
+ return 0;
+
+ return vde_send(vconn, buf, len, 0);
+}
+
diff --git a/arch/um/drivers/vector_kern.c b/arch/um/drivers/vector_kern.c
new file mode 100644
index 0000000..50ee3bb
--- /dev/null
+++ b/arch/um/drivers/vector_kern.c
@@ -0,0 +1,1641 @@
+/*
+ * Copyright (C) 2017 - Cambridge Greys Limited
+ * Copyright (C) 2011 - 2014 Cisco Systems Inc
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ * Licensed under the GPL.
+ */
+
+#include <linux/version.h>
+#include <linux/bootmem.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/inetdevice.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <init.h>
+#include <irq_kern.h>
+#include <irq_user.h>
+#include <net_kern.h>
+#include <os.h>
+#include "mconsole_kern.h"
+#include "vector_user.h"
+#include "vector_kern.h"
+
+/*
+ * Adapted from network devices with the following major changes:
+ * All transports are static - simplifies the code significantly
+ * Multiple FDs/IRQs per device
+ * Vector IO optionally used for read/write, falling back to legacy
+ * based on configuration and/or availability
+ * Configuration is no longer positional - L2TPv3 and GRE require up to
+ * 10 parameters, passing this as positional is not fit for purpose.
+ * Only socket transports are supported
+ */
+
+
+#define DRIVER_NAME "uml-vector"
+#define DRIVER_VERSION "01"
+struct vector_cmd_line_arg {
+ struct list_head list;
+ int unit;
+ char *arguments;
+};
+
+struct vector_device {
+ struct list_head list;
+ struct net_device *dev;
+ struct platform_device pdev;
+ int unit;
+ int opened;
+};
+
+static LIST_HEAD(vec_cmd_line);
+
+static DEFINE_SPINLOCK(vector_devices_lock);
+static LIST_HEAD(vector_devices);
+
+static int driver_registered;
+
+static void vector_eth_configure(int n, struct arglist *def);
+
+/* Argument accessors to set variables (and/or set default values)
+ * mtu, buffer sizing, default headroom, etc
+ */
+
+#define DEFAULT_HEADROOM 2
+#define SAFETY_MARGIN 32
+#define DEFAULT_VECTOR_SIZE 64
+#define TX_SMALL_PACKET 128
+#define MAX_IOV_SIZE (MAX_SKB_FRAGS + 1)
+
+static const struct {
+ const char string[ETH_GSTRING_LEN];
+} ethtool_stats_keys[] = {
+ { "rx_queue_max" },
+ { "rx_queue_running_average" },
+ { "tx_queue_max" },
+ { "tx_queue_running_average" },
+ { "rx_encaps_errors" },
+ { "tx_timeout_count" },
+ { "tx_restart_queue" },
+ { "tx_kicks" },
+ { "tx_flow_control_xon" },
+ { "tx_flow_control_xoff" },
+ { "rx_csum_offload_good" },
+ { "rx_csum_offload_errors"},
+ { "sg_ok"},
+ { "sg_linearized"},
+};
+
+#define VECTOR_NUM_STATS ARRAY_SIZE(ethtool_stats_keys)
+
+static void vector_reset_stats(struct vector_private *vp)
+{
+ vp->estats.rx_queue_max = 0;
+ vp->estats.rx_queue_running_average = 0;
+ vp->estats.tx_queue_max = 0;
+ vp->estats.tx_queue_running_average = 0;
+ vp->estats.rx_encaps_errors = 0;
+ vp->estats.tx_timeout_count = 0;
+ vp->estats.tx_restart_queue = 0;
+ vp->estats.tx_kicks = 0;
+ vp->estats.tx_flow_control_xon = 0;
+ vp->estats.tx_flow_control_xoff = 0;
+ vp->estats.sg_ok = 0;
+ vp->estats.sg_linearized = 0;
+}
+
+static int get_mtu(struct arglist *def)
+{
+ char *mtu = uml_vector_fetch_arg(def, "mtu");
+ long result;
+
+ if (mtu != NULL) {
+ if (kstrtoul(mtu, 10, &result) == 0)
+ return result;
+ }
+ return ETH_MAX_PACKET;
+}
+
+static int get_depth(struct arglist *def)
+{
+ char *mtu = uml_vector_fetch_arg(def, "depth");
+ long result;
+
+ if (mtu != NULL) {
+ if (kstrtoul(mtu, 10, &result) == 0)
+ return result;
+ }
+ return DEFAULT_VECTOR_SIZE;
+}
+
+static int get_headroom(struct arglist *def)
+{
+ char *mtu = uml_vector_fetch_arg(def, "headroom");
+ long result;
+
+ if (mtu != NULL) {
+ if (kstrtoul(mtu, 10, &result) == 0)
+ return result;
+ }
+ return DEFAULT_HEADROOM;
+}
+
+static int get_req_size(struct arglist *def)
+{
+ char *gro = uml_vector_fetch_arg(def, "gro");
+ long result;
+
+ if (gro != NULL) {
+ if (kstrtoul(gro, 10, &result) == 0) {
+ if (result > 0)
+ return 65536;
+ }
+ }
+ return get_mtu(def) + ETH_HEADER_OTHER +
+ get_headroom(def) + SAFETY_MARGIN;
+}
+
+
+static int get_transport_options(struct arglist *def)
+{
+ char *transport = uml_vector_fetch_arg(def, "transport");
+ char *vector = uml_vector_fetch_arg(def, "vec");
+
+ int vec_rx = VECTOR_RX;
+ int vec_tx = VECTOR_TX;
+ long parsed;
+
+ if (vector != NULL) {
+ if (kstrtoul(vector, 10, &parsed) == 0) {
+ if (parsed == 0) {
+ vec_rx = 0;
+ vec_tx = 0;
+ }
+ }
+ }
+
+
+ if (strncmp(transport, TRANS_TAP, TRANS_TAP_LEN) == 0)
+ return (vec_rx | VECTOR_BPF);
+ if (strncmp(transport, TRANS_RAW, TRANS_RAW_LEN) == 0)
+ return (vec_rx | vec_tx | VECTOR_QDISC_BYPASS);
+ return (vec_rx | vec_tx);
+}
+
+
+/* A mini-buffer for packet drop read
+ * All of our supported transports are datagram oriented and we always
+ * read using recvmsg or recvmmsg. If we pass a buffer which is smaller
+ * than the packet size it still counts as full packet read and will
+ * clean the incoming stream to keep sigio/epoll happy
+ */
+
+#define DROP_BUFFER_SIZE 32
+
+static char *drop_buffer;
+
+/* Array backed queues optimized for bulk enqueue/dequeue and
+ * 1:N (small values of N) or 1:1 enqueuer/dequeuer ratios.
+ * For more details and full design rationale see
+ * http://foswiki.cambridgegreys.com/Main/EatYourTailAndEnjoyIt
+ */
+
+
+/*
+ * Advance the mmsg queue head by n = advance. Resets the queue to
+ * maximum enqueue/dequeue-at-once capacity if possible. Called by
+ * dequeuers. Caller must hold the head_lock!
+ */
+
+static int vector_advancehead(struct vector_queue *qi, int advance)
+{
+ int queue_depth;
+
+ qi->head =
+ (qi->head + advance)
+ % qi->max_depth;
+
+
+ spin_lock(&qi->tail_lock);
+ qi->queue_depth -= advance;
+
+ /* we are at 0, use this to
+ * reset head and tail so we can use max size vectors
+ */
+
+ if (qi->queue_depth == 0) {
+ qi->head = 0;
+ qi->tail = 0;
+ }
+ queue_depth = qi->queue_depth;
+ spin_unlock(&qi->tail_lock);
+ return queue_depth;
+}
+
+/* Advance the queue tail by n = advance.
+ * This is called by enqueuers which should hold the
+ * head lock already
+ */
+
+static int vector_advancetail(struct vector_queue *qi, int advance)
+{
+ int queue_depth;
+
+ qi->tail =
+ (qi->tail + advance)
+ % qi->max_depth;
+ spin_lock(&qi->head_lock);
+ qi->queue_depth += advance;
+ queue_depth = qi->queue_depth;
+ spin_unlock(&qi->head_lock);
+ return queue_depth;
+}
+
+static int prep_msg(struct vector_private *vp,
+ struct sk_buff *skb,
+ struct iovec *iov)
+{
+ int iov_index = 0;
+ int nr_frags, frag;
+ skb_frag_t *skb_frag;
+
+ nr_frags = skb_shinfo(skb)->nr_frags;
+ if (nr_frags > MAX_IOV_SIZE) {
+ if (skb_linearize(skb) != 0)
+ goto drop;
+ }
+ if (vp->header_size > 0) {
+ iov[iov_index].iov_len = vp->header_size;
+ vp->form_header(iov[iov_index].iov_base, skb, vp);
+ iov_index++;
+ }
+ iov[iov_index].iov_base = skb->data;
+ if (nr_frags > 0) {
+ iov[iov_index].iov_len = skb->len - skb->data_len;
+ vp->estats.sg_ok++;
+ } else
+ iov[iov_index].iov_len = skb->len;
+ iov_index++;
+ for (frag = 0; frag < nr_frags; frag++) {
+ skb_frag = &skb_shinfo(skb)->frags[frag];
+ iov[iov_index].iov_base = skb_frag_address_safe(skb_frag);
+ iov[iov_index].iov_len = skb_frag_size(skb_frag);
+ iov_index++;
+ }
+ return iov_index;
+drop:
+ return -1;
+}
+/*
+ * Generic vector enqueue with support for forming headers using transport
+ * specific callback. Allows GRE, L2TPv3, RAW and other transports
+ * to use a common enqueue procedure in vector mode
+ */
+
+static int vector_enqueue(struct vector_queue *qi, struct sk_buff *skb)
+{
+ struct vector_private *vp = netdev_priv(qi->dev);
+ int queue_depth;
+ int packet_len;
+ struct mmsghdr *mmsg_vector = qi->mmsg_vector;
+ int iov_count;
+
+ spin_lock(&qi->tail_lock);
+ spin_lock(&qi->head_lock);
+ queue_depth = qi->queue_depth;
+ spin_unlock(&qi->head_lock);
+
+ if (skb)
+ packet_len = skb->len;
+
+ if (queue_depth < qi->max_depth) {
+
+ *(qi->skbuff_vector + qi->tail) = skb;
+ mmsg_vector += qi->tail;
+ iov_count = prep_msg(
+ vp,
+ skb,
+ mmsg_vector->msg_hdr.msg_iov
+ );
+ if (iov_count < 1)
+ goto drop;
+ mmsg_vector->msg_hdr.msg_iovlen = iov_count;
+ mmsg_vector->msg_hdr.msg_name = vp->fds->remote_addr;
+ mmsg_vector->msg_hdr.msg_namelen = vp->fds->remote_addr_size;
+ queue_depth = vector_advancetail(qi, 1);
+ } else
+ goto drop;
+ spin_unlock(&qi->tail_lock);
+ return queue_depth;
+drop:
+ qi->dev->stats.tx_dropped++;
+ if (skb != NULL) {
+ packet_len = skb->len;
+ dev_consume_skb_any(skb);
+ netdev_completed_queue(qi->dev, 1, packet_len);
+ }
+ spin_unlock(&qi->tail_lock);
+ return queue_depth;
+}
+
+static int consume_vector_skbs(struct vector_queue *qi, int count)
+{
+ struct sk_buff *skb;
+ int skb_index;
+ int bytes_compl = 0;
+
+ for (skb_index = qi->head; skb_index < qi->head + count; skb_index++) {
+ skb = *(qi->skbuff_vector + skb_index);
+ /* mark as empty to ensure correct destruction if
+ * needed
+ */
+ bytes_compl += skb->len;
+ *(qi->skbuff_vector + skb_index) = NULL;
+ dev_consume_skb_any(skb);
+ }
+ qi->dev->stats.tx_bytes += bytes_compl;
+ qi->dev->stats.tx_packets += count;
+ netdev_completed_queue(qi->dev, count, bytes_compl);
+ return vector_advancehead(qi, count);
+}
+
+/*
+ * Generic vector deque via sendmmsg with support for forming headers
+ * using transport specific callback. Allows GRE, L2TPv3, RAW and
+ * other transports to use a common dequeue procedure in vector mode
+ */
+
+
+static int vector_send(struct vector_queue *qi)
+{
+ struct vector_private *vp = netdev_priv(qi->dev);
+ struct mmsghdr *send_from;
+ int result = 0, send_len, queue_depth = qi->max_depth;
+
+ if (spin_trylock(&qi->head_lock)) {
+ if (spin_trylock(&qi->tail_lock)) {
+ /* update queue_depth to current value */
+ queue_depth = qi->queue_depth;
+ spin_unlock(&qi->tail_lock);
+ while (queue_depth > 0) {
+ /* Calculate the start of the vector */
+ send_len = queue_depth;
+ send_from = qi->mmsg_vector;
+ send_from += qi->head;
+ /* Adjust vector size if wraparound */
+ if (send_len + qi->head > qi->max_depth)
+ send_len = qi->max_depth - qi->head;
+ /* Try to TX as many packets as possible */
+ if (send_len > 0) {
+ result = uml_vector_sendmmsg(
+ vp->fds->tx_fd,
+ send_from,
+ send_len,
+ 0
+ );
+ vp->in_write_poll =
+ (result != send_len);
+ }
+ /* For some of the sendmmsg error scenarios
+ * we may end being unsure in the TX success
+ * for all packets. It is safer to declare
+ * them all TX-ed and blame the network.
+ */
+ if (result < 0) {
+ if (net_ratelimit())
+ netdev_err(vp->dev, "sendmmsg err=%i\n",
+ result);
+ result = send_len;
+ }
+ if (result > 0) {
+ queue_depth =
+ consume_vector_skbs(qi, result);
+ /* This is equivalent to an TX IRQ.
+ * Restart the upper layers to feed us
+ * more packets.
+ */
+ if (result > vp->estats.tx_queue_max)
+ vp->estats.tx_queue_max = result;
+ vp->estats.tx_queue_running_average =
+ (vp->estats.tx_queue_running_average + result) >> 1;
+ }
+ netif_trans_update(qi->dev);
+ netif_wake_queue(qi->dev);
+ /* if TX is busy, break out of the send loop,
+ * poll write IRQ will reschedule xmit for us
+ */
+ if (result != send_len) {
+ vp->estats.tx_restart_queue++;
+ break;
+ }
+ }
+ }
+ spin_unlock(&qi->head_lock);
+ } else {
+ tasklet_schedule(&vp->tx_poll);
+ }
+ return queue_depth;
+}
+
+/* Queue destructor. Deliberately stateless so we can use
+ * it in queue cleanup if initialization fails.
+ */
+
+static void destroy_queue(struct vector_queue *qi)
+{
+ int i;
+ struct iovec *iov;
+ struct vector_private *vp = netdev_priv(qi->dev);
+ struct mmsghdr *mmsg_vector;
+
+ if (qi == NULL)
+ return;
+ /* deallocate any skbuffs - we rely on any unused to be
+ * set to NULL.
+ */
+ if (qi->skbuff_vector != NULL) {
+ for (i = 0; i < qi->max_depth; i++) {
+ if (*(qi->skbuff_vector + i) != NULL)
+ dev_kfree_skb_any(*(qi->skbuff_vector + i));
+ }
+ kfree(qi->skbuff_vector);
+ }
+ /* deallocate matching IOV structures including header buffs */
+ if (qi->mmsg_vector != NULL) {
+ mmsg_vector = qi->mmsg_vector;
+ for (i = 0; i < qi->max_depth; i++) {
+ iov = mmsg_vector->msg_hdr.msg_iov;
+ if (iov != NULL) {
+ if ((vp->header_size > 0) &&
+ (iov->iov_base != NULL))
+ kfree(iov->iov_base);
+ kfree(iov);
+ }
+ mmsg_vector++;
+ }
+ kfree(qi->mmsg_vector);
+ }
+ kfree(qi);
+}
+
+/*
+ * Queue constructor. Create a queue with a given side.
+ */
+static struct vector_queue *create_queue(
+ struct vector_private *vp,
+ int max_size,
+ int header_size,
+ int num_extra_frags)
+{
+ struct vector_queue *result;
+ int i;
+ struct iovec *iov;
+ struct mmsghdr *mmsg_vector;
+
+ result = kmalloc(sizeof(struct vector_queue), GFP_KERNEL);
+ if (result == NULL)
+ return NULL;
+ result->max_depth = max_size;
+ result->dev = vp->dev;
+ result->mmsg_vector = kmalloc(
+ (sizeof(struct mmsghdr) * max_size), GFP_KERNEL);
+ if (result->mmsg_vector == NULL)
+ goto out_mmsg_fail;
+ result->skbuff_vector = kmalloc(
+ (sizeof(void *) * max_size), GFP_KERNEL);
+ if (result->skbuff_vector == NULL)
+ goto out_skb_fail;
+
+ /* further failures can be handled safely by destroy_queue*/
+
+ mmsg_vector = result->mmsg_vector;
+ for (i = 0; i < max_size; i++) {
+ /* Clear all pointers - we use non-NULL as marking on
+ * what to free on destruction
+ */
+ *(result->skbuff_vector + i) = NULL;
+ mmsg_vector->msg_hdr.msg_iov = NULL;
+ mmsg_vector++;
+ }
+ mmsg_vector = result->mmsg_vector;
+ result->max_iov_frags = num_extra_frags;
+ for (i = 0; i < max_size; i++) {
+ if (vp->header_size > 0)
+ iov = kmalloc_array(3 + num_extra_frags,
+ sizeof(struct iovec),
+ GFP_KERNEL
+ );
+ else
+ iov = kmalloc_array(2 + num_extra_frags,
+ sizeof(struct iovec),
+ GFP_KERNEL
+ );
+ if (iov == NULL)
+ goto out_fail;
+ mmsg_vector->msg_hdr.msg_iov = iov;
+ mmsg_vector->msg_hdr.msg_iovlen = 1;
+ mmsg_vector->msg_hdr.msg_control = NULL;
+ mmsg_vector->msg_hdr.msg_controllen = 0;
+ mmsg_vector->msg_hdr.msg_flags = MSG_DONTWAIT;
+ mmsg_vector->msg_hdr.msg_name = NULL;
+ mmsg_vector->msg_hdr.msg_namelen = 0;
+ if (vp->header_size > 0) {
+ iov->iov_base = kmalloc(header_size, GFP_KERNEL);
+ if (iov->iov_base == NULL)
+ goto out_fail;
+ iov->iov_len = header_size;
+ mmsg_vector->msg_hdr.msg_iovlen = 2;
+ iov++;
+ }
+ iov->iov_base = NULL;
+ iov->iov_len = 0;
+ mmsg_vector++;
+ }
+ spin_lock_init(&result->head_lock);
+ spin_lock_init(&result->tail_lock);
+ result->queue_depth = 0;
+ result->head = 0;
+ result->tail = 0;
+ return result;
+out_skb_fail:
+ kfree(result->mmsg_vector);
+out_mmsg_fail:
+ kfree(result);
+ return NULL;
+out_fail:
+ destroy_queue(result);
+ return NULL;
+}
+
+/*
+ * We do not use the RX queue as a proper wraparound queue for now
+ * This is not necessary because the consumption via netif_rx()
+ * happens in-line. While we can try using the return code of
+ * netif_rx() for flow control there are no drivers doing this today.
+ * For this RX specific use we ignore the tail/head locks and
+ * just read into a prepared queue filled with skbuffs.
+ */
+
+static struct sk_buff *prep_skb(
+ struct vector_private *vp,
+ struct user_msghdr *msg)
+{
+ int linear = vp->max_packet + vp->headroom + SAFETY_MARGIN;
+ struct sk_buff *result;
+ int iov_index = 0, len;
+ struct iovec *iov = msg->msg_iov;
+ int err, nr_frags, frag;
+ skb_frag_t *skb_frag;
+
+ if (vp->req_size <= linear)
+ len = linear;
+ else
+ len = vp->req_size;
+ result = alloc_skb_with_frags(
+ linear,
+ len - vp->max_packet,
+ 3,
+ &err,
+ GFP_ATOMIC
+ );
+ if (vp->header_size > 0)
+ iov_index++;
+ if (result == NULL) {
+ iov[iov_index].iov_base = NULL;
+ iov[iov_index].iov_len = 0;
+ goto done;
+ }
+ skb_reserve(result, vp->headroom);
+ result->dev = vp->dev;
+ skb_put(result, vp->max_packet);
+ result->data_len = len - vp->max_packet;
+ result->len += len - vp->max_packet;
+ skb_reset_mac_header(result);
+ result->ip_summed = CHECKSUM_NONE;
+ iov[iov_index].iov_base = result->data;
+ iov[iov_index].iov_len = vp->max_packet;
+ iov_index++;
+
+ nr_frags = skb_shinfo(result)->nr_frags;
+ for (frag = 0; frag < nr_frags; frag++) {
+ skb_frag = &skb_shinfo(result)->frags[frag];
+ iov[iov_index].iov_base = skb_frag_address_safe(skb_frag);
+ if (iov[iov_index].iov_base != NULL)
+ iov[iov_index].iov_len = skb_frag_size(skb_frag);
+ else
+ iov[iov_index].iov_len = 0;
+ iov_index++;
+ }
+done:
+ msg->msg_iovlen = iov_index;
+ return result;
+}
+
+
+/* Prepare queue for recvmmsg one-shot rx - fill with fresh sk_buffs*/
+
+static void prep_queue_for_rx(struct vector_queue *qi)
+{
+ struct vector_private *vp = netdev_priv(qi->dev);
+ struct mmsghdr *mmsg_vector = qi->mmsg_vector;
+ void **skbuff_vector = qi->skbuff_vector;
+ int i;
+
+ if (qi->queue_depth == 0)
+ return;
+ for (i = 0; i < qi->queue_depth; i++) {
+ /* it is OK if allocation fails - recvmmsg with NULL data in
+ * iov argument still performs an RX, just drops the packet
+ * This allows us stop faffing around with a "drop buffer"
+ */
+
+ *skbuff_vector = prep_skb(vp, &mmsg_vector->msg_hdr);
+ skbuff_vector++;
+ mmsg_vector++;
+ }
+ qi->queue_depth = 0;
+}
+
+static struct vector_device *find_device(int n)
+{
+ struct vector_device *device;
+ struct list_head *ele;
+
+ spin_lock(&vector_devices_lock);
+ list_for_each(ele, &vector_devices) {
+ device = list_entry(ele, struct vector_device, list);
+ if (device->unit == n)
+ goto out;
+ }
+ device = NULL;
+ out:
+ spin_unlock(&vector_devices_lock);
+ return device;
+}
+
+static int vector_parse(char *str, int *index_out, char **str_out,
+ char **error_out)
+{
+ int n, len, err;
+ char *start = str;
+
+ len = strlen(str);
+
+ while ((*str != ':') && (strlen(str) > 1))
+ str++;
+ if (*str != ':') {
+ *error_out = "Expected ':' after device number";
+ return -EINVAL;
+ }
+ *str = '\0';
+
+ err = kstrtouint(start, 0, &n);
+ if (err < 0) {
+ *error_out = "Bad device number";
+ return err;
+ }
+
+ str++;
+ if (find_device(n)) {
+ *error_out = "Device already configured";
+ return -EINVAL;
+ }
+
+ *index_out = n;
+ *str_out = str;
+ return 0;
+}
+
+static int vector_config(char *str, char **error_out)
+{
+ int err, n;
+ char *params;
+ struct arglist *parsed;
+
+ err = vector_parse(str, &n, ¶ms, error_out);
+ if (err != 0)
+ return err;
+
+ /* This string is broken up and the pieces used by the underlying
+ * driver. We should copy it to make sure things do not go wrong
+ * later.
+ */
+
+ params = kstrdup(params, GFP_KERNEL);
+ if (params == NULL) {
+ *error_out = "vector_config failed to strdup string";
+ return -ENOMEM;
+ }
+
+ parsed = uml_parse_vector_ifspec(params);
+
+ if (parsed == NULL) {
+ *error_out = "vector_config failed to parse parameters";
+ return -EINVAL;
+ }
+
+ vector_eth_configure(n, parsed);
+ return 0;
+}
+
+static int vector_id(char **str, int *start_out, int *end_out)
+{
+ char *end;
+ int n;
+
+ n = simple_strtoul(*str, &end, 0);
+ if ((*end != '\0') || (end == *str))
+ return -1;
+
+ *start_out = n;
+ *end_out = n;
+ *str = end;
+ return n;
+}
+
+static int vector_remove(int n, char **error_out)
+{
+ struct vector_device *vec_d;
+ struct net_device *dev;
+ struct vector_private *vp;
+
+ vec_d = find_device(n);
+ if (vec_d == NULL)
+ return -ENODEV;
+ dev = vec_d->dev;
+ vp = netdev_priv(dev);
+ if (vp->fds != NULL)
+ return -EBUSY;
+ unregister_netdev(dev);
+ platform_device_unregister(&vec_d->pdev);
+ return 0;
+}
+
+/*
+ * There is no shared per-transport initialization code, so
+ * we will just initialize each interface one by one and
+ * add them to a list
+ */
+
+static struct platform_driver uml_net_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+};
+
+
+static void vector_device_release(struct device *dev)
+{
+ struct vector_device *device = dev_get_drvdata(dev);
+ struct net_device *netdev = device->dev;
+
+ list_del(&device->list);
+ kfree(device);
+ free_netdev(netdev);
+}
+
+/* Bog standard recv using recvmsg - not used normally unless the user
+ * explicitly specifies not to use recvmmsg vector RX.
+ */
+
+static int vector_legacy_rx(struct vector_private *vp)
+{
+ int pkt_len;
+ struct user_msghdr hdr;
+ struct iovec iov[2 + MAX_IOV_SIZE]; /* header + data use case only */
+ int iovpos = 0;
+ struct sk_buff *skb;
+ int header_check;
+
+ hdr.msg_name = NULL;
+ hdr.msg_namelen = 0;
+ hdr.msg_iov = (struct iovec *) &iov;
+ hdr.msg_control = NULL;
+ hdr.msg_controllen = 0;
+ hdr.msg_flags = 0;
+
+ if (vp->header_size > 0) {
+ iov[0].iov_base = vp->header_rxbuffer;
+ iov[0].iov_len = vp->header_size;
+ }
+
+ skb = prep_skb(vp, &hdr);
+
+ if (skb == NULL) {
+ /* Read a packet into drop_buffer and don't do
+ * anything with it.
+ */
+ iov[iovpos].iov_base = drop_buffer;
+ iov[iovpos].iov_len = DROP_BUFFER_SIZE;
+ hdr.msg_iovlen = 1;
+ vp->dev->stats.rx_dropped++;
+ }
+
+ pkt_len = uml_vector_recvmsg(vp->fds->rx_fd, &hdr, 0);
+
+ if (skb != NULL) {
+ if (pkt_len > vp->header_size) {
+ if (vp->header_size > 0) {
+ header_check = vp->verify_header(
+ vp->header_rxbuffer, skb, vp);
+ if (header_check < 0) {
+ dev_kfree_skb_irq(skb);
+ vp->dev->stats.rx_dropped++;
+ vp->estats.rx_encaps_errors++;
+ return 0;
+ }
+ if (header_check > 0) {
+ vp->estats.rx_csum_offload_good++;
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ }
+ pskb_trim(skb, pkt_len - vp->rx_header_size);
+ skb->protocol = eth_type_trans(skb, skb->dev);
+ vp->dev->stats.rx_bytes += skb->len;
+ vp->dev->stats.rx_packets++;
+ netif_rx(skb);
+ } else {
+ dev_kfree_skb_irq(skb);
+ }
+ }
+ return pkt_len;
+}
+
+/*
+ * Packet at a time TX which falls back to vector TX if the
+ * underlying transport is busy.
+ */
+
+
+
+static int writev_tx(struct vector_private *vp, struct sk_buff *skb)
+{
+ struct iovec iov[3 + MAX_IOV_SIZE];
+ int iov_count, pkt_len = 0;
+
+ iov[0].iov_base = vp->header_txbuffer;
+ iov_count = prep_msg(vp, skb, (struct iovec *) &iov);
+
+ if (iov_count < 1)
+ goto drop;
+ pkt_len = uml_vector_writev(
+ vp->fds->tx_fd,
+ (struct iovec *) &iov,
+ iov_count
+ );
+
+ netif_trans_update(vp->dev);
+ netif_wake_queue(vp->dev);
+
+ if (pkt_len > 0) {
+ vp->dev->stats.tx_bytes += skb->len;
+ vp->dev->stats.tx_packets++;
+ } else {
+ vp->dev->stats.tx_dropped++;
+ }
+ consume_skb(skb);
+ return pkt_len;
+drop:
+ vp->dev->stats.tx_dropped++;
+ consume_skb(skb);
+ return pkt_len;
+}
+
+/*
+ * Receive as many messages as we can in one call using the special
+ * mmsg vector matched to an skb vector which we prepared earlier.
+ */
+
+static int vector_mmsg_rx(struct vector_private *vp)
+{
+ int packet_count, i;
+ struct vector_queue *qi = vp->rx_queue;
+ struct sk_buff *skb;
+ struct mmsghdr *mmsg_vector = qi->mmsg_vector;
+ void **skbuff_vector = qi->skbuff_vector;
+ int header_check;
+
+ /* Refresh the vector and make sure it is with new skbs and the
+ * iovs are updated to point to them.
+ */
+
+ prep_queue_for_rx(qi);
+
+ /* Fire the Lazy Gun - get as many packets as we can in one go. */
+
+ packet_count = uml_vector_recvmmsg(
+ vp->fds->rx_fd, qi->mmsg_vector, qi->max_depth, 0);
+
+ if (packet_count <= 0)
+ return packet_count;
+
+ /* We treat packet processing as enqueue, buffer refresh as dequeue
+ * The queue_depth tells us how many buffers have been used and how
+ * many do we need to prep the next time prep_queue_for_rx() is called.
+ */
+
+ qi->queue_depth = packet_count;
+
+ for (i = 0; i < packet_count; i++) {
+ skb = (*skbuff_vector);
+ if (mmsg_vector->msg_len > vp->header_size) {
+ if (vp->header_size > 0) {
+ header_check = vp->verify_header(
+ mmsg_vector->msg_hdr.msg_iov->iov_base,
+ skb,
+ vp
+ );
+ if (header_check < 0) {
+ /* Overlay header failed to verify - discard.
+ * We can actually keep this skb and reuse it,
+ * but that will make the prep logic too
+ * complex.
+ */
+ dev_kfree_skb_irq(skb);
+ vp->estats.rx_encaps_errors++;
+ continue;
+ }
+ if (header_check > 0) {
+ vp->estats.rx_csum_offload_good++;
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ }
+ pskb_trim(skb,
+ mmsg_vector->msg_len - vp->rx_header_size);
+ skb->protocol = eth_type_trans(skb, skb->dev);
+ /*
+ * We do not need to lock on updating stats here
+ * The interrupt loop is non-reentrant.
+ */
+ vp->dev->stats.rx_bytes += skb->len;
+ vp->dev->stats.rx_packets++;
+ netif_rx(skb);
+ } else {
+ /* Overlay header too short to do anything - discard.
+ * We can actually keep this skb and reuse it,
+ * but that will make the prep logic too complex.
+ */
+ if (skb != NULL)
+ dev_kfree_skb_irq(skb);
+ }
+ (*skbuff_vector) = NULL;
+ /* Move to the next buffer element */
+ mmsg_vector++;
+ skbuff_vector++;
+ }
+ if (packet_count > 0) {
+ if (vp->estats.rx_queue_max < packet_count)
+ vp->estats.rx_queue_max = packet_count;
+ vp->estats.rx_queue_running_average =
+ (vp->estats.rx_queue_running_average + packet_count) >> 1;
+ }
+ return packet_count;
+}
+
+static void vector_rx(struct vector_private *vp)
+{
+ int err;
+
+ if ((vp->options & VECTOR_RX) > 0)
+ while ((err = vector_mmsg_rx(vp)) > 0)
+ ;
+ else
+ while ((err = vector_legacy_rx(vp)) > 0)
+ ;
+ if ((err != 0) && net_ratelimit())
+ netdev_err(vp->dev, "vector_rx: error(%d)\n", err);
+}
+
+static int vector_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct vector_private *vp = netdev_priv(dev);
+ int queue_depth = 0;
+
+ if ((vp->options & VECTOR_TX) == 0) {
+ writev_tx(vp, skb);
+ return NETDEV_TX_OK;
+ }
+
+ /* We do BQL only in the vector path, no point doing it in
+ * packet at a time mode as there is no device queue
+ */
+
+ netdev_sent_queue(vp->dev, skb->len);
+ queue_depth = vector_enqueue(vp->tx_queue, skb);
+
+ /* if the device queue is full, stop the upper layers and
+ * flush it.
+ */
+
+ if (queue_depth >= vp->tx_queue->max_depth - 1) {
+ vp->estats.tx_kicks++;
+ netif_stop_queue(dev);
+ vector_send(vp->tx_queue);
+ return NETDEV_TX_OK;
+ }
+ if (skb->xmit_more) {
+ mod_timer(&vp->tl, vp->coalesce);
+ return NETDEV_TX_OK;
+ }
+ if (skb->len < TX_SMALL_PACKET) {
+ vp->estats.tx_kicks++;
+ vector_send(vp->tx_queue);
+ } else
+ tasklet_schedule(&vp->tx_poll);
+ return NETDEV_TX_OK;
+}
+
+static irqreturn_t vector_rx_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct vector_private *vp = netdev_priv(dev);
+
+ if (!netif_running(dev))
+ return IRQ_NONE;
+ vector_rx(vp);
+ return IRQ_HANDLED;
+
+}
+
+static irqreturn_t vector_tx_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct vector_private *vp = netdev_priv(dev);
+
+ if (!netif_running(dev))
+ return IRQ_NONE;
+ /* We need to pay attention to it only if we got
+ * -EAGAIN or -ENOBUFFS from sendmmsg. Otherwise
+ * we ignore it. In the future, it may be worth
+ * it to improve the IRQ controller a bit to make
+ * tweaking the IRQ mask less costly
+ */
+
+ if (vp->in_write_poll)
+ tasklet_schedule(&vp->tx_poll);
+ return IRQ_HANDLED;
+
+}
+
+static int irq_rr;
+
+static int vector_net_close(struct net_device *dev)
+{
+ struct vector_private *vp = netdev_priv(dev);
+ unsigned long flags;
+
+ netif_stop_queue(dev);
+ del_timer(&vp->tl);
+
+ if (vp->fds == NULL)
+ return 0;
+
+ /* Disable and free all IRQS */
+ if (vp->rx_irq > 0) {
+ um_free_irq(vp->rx_irq, dev);
+ vp->rx_irq = 0;
+ }
+ if (vp->tx_irq > 0) {
+ um_free_irq(vp->tx_irq, dev);
+ vp->tx_irq = 0;
+ }
+ tasklet_kill(&vp->tx_poll);
+ if (vp->fds->rx_fd > 0) {
+ os_close_file(vp->fds->rx_fd);
+ vp->fds->rx_fd = -1;
+ }
+ if (vp->fds->tx_fd > 0) {
+ os_close_file(vp->fds->tx_fd);
+ vp->fds->tx_fd = -1;
+ }
+ if (vp->bpf != NULL)
+ kfree(vp->bpf);
+ if (vp->fds->remote_addr != NULL)
+ kfree(vp->fds->remote_addr);
+ if (vp->transport_data != NULL)
+ kfree(vp->transport_data);
+ if (vp->header_rxbuffer != NULL)
+ kfree(vp->header_rxbuffer);
+ if (vp->header_txbuffer != NULL)
+ kfree(vp->header_txbuffer);
+ if (vp->rx_queue != NULL)
+ destroy_queue(vp->rx_queue);
+ if (vp->tx_queue != NULL)
+ destroy_queue(vp->tx_queue);
+ kfree(vp->fds);
+ vp->fds = NULL;
+ spin_lock_irqsave(&vp->lock, flags);
+ vp->opened = false;
+ spin_unlock_irqrestore(&vp->lock, flags);
+ return 0;
+}
+
+/* TX tasklet */
+
+static void vector_tx_poll(unsigned long data)
+{
+ struct vector_private *vp = (struct vector_private *)data;
+
+ vp->estats.tx_kicks++;
+ vector_send(vp->tx_queue);
+}
+static void vector_reset_tx(struct work_struct *work)
+{
+ struct vector_private *vp =
+ container_of(work, struct vector_private, reset_tx);
+ netdev_reset_queue(vp->dev);
+ netif_start_queue(vp->dev);
+ netif_wake_queue(vp->dev);
+}
+static int vector_net_open(struct net_device *dev)
+{
+ struct vector_private *vp = netdev_priv(dev);
+ unsigned long flags;
+ int err = -EINVAL;
+ struct vector_device *vdevice;
+
+ spin_lock_irqsave(&vp->lock, flags);
+ if (vp->opened) {
+ spin_unlock_irqrestore(&vp->lock, flags);
+ return -ENXIO;
+ }
+ vp->opened = true;
+ spin_unlock_irqrestore(&vp->lock, flags);
+
+ vp->fds = uml_vector_user_open(vp->unit, vp->parsed);
+
+ if (vp->fds == NULL)
+ goto out_close;
+
+ if (build_transport_data(vp) < 0)
+ goto out_close;
+
+ if ((vp->options & VECTOR_RX) > 0) {
+ vp->rx_queue = create_queue(
+ vp,
+ get_depth(vp->parsed),
+ vp->rx_header_size,
+ MAX_IOV_SIZE
+ );
+ vp->rx_queue->queue_depth = get_depth(vp->parsed);
+ } else {
+ vp->header_rxbuffer = kmalloc(
+ vp->rx_header_size,
+ GFP_KERNEL
+ );
+ if (vp->header_rxbuffer == NULL)
+ goto out_close;
+ }
+ if ((vp->options & VECTOR_TX) > 0) {
+ vp->tx_queue = create_queue(
+ vp,
+ get_depth(vp->parsed),
+ vp->header_size,
+ MAX_IOV_SIZE
+ );
+ } else {
+ vp->header_txbuffer = kmalloc(vp->header_size, GFP_KERNEL);
+ if (vp->header_txbuffer == NULL)
+ goto out_close;
+ }
+
+ /* READ IRQ */
+ err = um_request_irq(
+ irq_rr + VECTOR_BASE_IRQ, vp->fds->rx_fd,
+ IRQ_READ, vector_rx_interrupt,
+ IRQF_SHARED, dev->name, dev);
+ if (err != 0) {
+ netdev_err(dev, "vector_open: failed to get rx irq(%d)\n", err);
+ err = -ENETUNREACH;
+ goto out_close;
+ }
+ vp->rx_irq = irq_rr + VECTOR_BASE_IRQ;
+ dev->irq = irq_rr + VECTOR_BASE_IRQ;
+ irq_rr = (irq_rr + 1) % VECTOR_IRQ_SPACE;
+
+ /* WRITE IRQ - we need it only if we have vector TX */
+ if ((vp->options & VECTOR_TX) > 0) {
+ err = um_request_irq(
+ irq_rr + VECTOR_BASE_IRQ, vp->fds->tx_fd,
+ IRQ_WRITE, vector_tx_interrupt,
+ IRQF_SHARED, dev->name, dev);
+ if (err != 0) {
+ netdev_err(dev,
+ "vector_open: failed to get tx irq(%d)\n", err);
+ err = -ENETUNREACH;
+ goto out_close;
+ }
+ vp->tx_irq = irq_rr + VECTOR_BASE_IRQ;
+ irq_rr = (irq_rr + 1) % VECTOR_IRQ_SPACE;
+ }
+
+ if ((vp->options & VECTOR_QDISC_BYPASS) != 0) {
+ if (!uml_raw_enable_qdisc_bypass(vp->fds->rx_fd))
+ vp->options |= VECTOR_BPF;
+ }
+ if ((vp->options & VECTOR_BPF) != 0)
+ vp->bpf = uml_vector_default_bpf(vp->fds->rx_fd, dev->dev_addr);
+
+ netif_start_queue(dev);
+
+ /* clear buffer - it can happen that the host side of the interface
+ * is full when we get here. In this case, new data is never queued,
+ * SIGIOs never arrive, and the net never works.
+ */
+
+ vector_rx(vp);
+
+ vector_reset_stats(vp);
+ vdevice = find_device(vp->unit);
+ vdevice->opened = 1;
+
+ if ((vp->options & VECTOR_TX) != 0)
+ add_timer(&vp->tl);
+ return 0;
+out_close:
+ vector_net_close(dev);
+ return err;
+}
+
+
+static void vector_net_set_multicast_list(struct net_device *dev)
+{
+ /* TODO: - we can do some BPF games here */
+ return;
+}
+
+static void vector_net_tx_timeout(struct net_device *dev)
+{
+ struct vector_private *vp = netdev_priv(dev);
+
+ vp->estats.tx_timeout_count++;
+ netif_trans_update(dev);
+ schedule_work(&vp->reset_tx);
+}
+
+static netdev_features_t vector_fix_features(struct net_device *dev,
+ netdev_features_t features)
+{
+ features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
+ return features;
+}
+
+static int vector_set_features(struct net_device *dev,
+ netdev_features_t features)
+{
+ struct vector_private *vp = netdev_priv(dev);
+ /* Adjust buffer sizes for GSO/GRO. Unfortunately, there is
+ * no way to negotiate it on raw sockets, so we can change
+ * only our side.
+ */
+ if (features & NETIF_F_GRO)
+ /* All new frame buffers will be GRO-sized */
+ vp->req_size = 65536;
+ else
+ /* All new frame buffers will be normal sized */
+ vp->req_size = vp->max_packet + vp->headroom + SAFETY_MARGIN;
+ return 0;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void vector_net_poll_controller(struct net_device *dev)
+{
+ disable_irq(dev->irq);
+ vector_rx_interrupt(dev->irq, dev);
+ enable_irq(dev->irq);
+}
+#endif
+
+static void vector_net_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *info)
+{
+ strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
+ strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
+}
+
+static void vector_get_ringparam(struct net_device *netdev,
+ struct ethtool_ringparam *ring)
+{
+ struct vector_private *vp = netdev_priv(netdev);
+
+ ring->rx_max_pending = vp->rx_queue->max_depth;
+ ring->tx_max_pending = vp->tx_queue->max_depth;
+ ring->rx_pending = vp->rx_queue->max_depth;
+ ring->tx_pending = vp->tx_queue->max_depth;
+}
+
+static void vector_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
+{
+ switch (stringset) {
+ case ETH_SS_TEST:
+ *buf = '\0';
+ break;
+ case ETH_SS_STATS:
+ memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
+ break;
+ default:
+ WARN_ON(1);
+ break;
+ }
+}
+
+static int vector_get_sset_count(struct net_device *dev, int sset)
+{
+ switch (sset) {
+ case ETH_SS_TEST:
+ return 0;
+ case ETH_SS_STATS:
+ return VECTOR_NUM_STATS;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static void vector_get_ethtool_stats(struct net_device *dev,
+ struct ethtool_stats *estats,
+ u64 *tmp_stats)
+{
+ struct vector_private *vp = netdev_priv(dev);
+
+ memcpy(tmp_stats, &vp->estats, sizeof(struct vector_estats));
+}
+
+static int vector_get_coalesce(struct net_device *netdev,
+ struct ethtool_coalesce *ec)
+{
+ struct vector_private *vp = netdev_priv(netdev);
+
+ ec->tx_coalesce_usecs = (vp->coalesce * 1000000) / HZ;
+ return 0;
+}
+
+static int vector_set_coalesce(struct net_device *netdev,
+ struct ethtool_coalesce *ec)
+{
+ struct vector_private *vp = netdev_priv(netdev);
+
+ vp->coalesce = (ec->tx_coalesce_usecs * HZ) / 1000000;
+ if (vp->coalesce == 0)
+ vp->coalesce = 1;
+ return 0;
+}
+
+static const struct ethtool_ops vector_net_ethtool_ops = {
+ .get_drvinfo = vector_net_get_drvinfo,
+ .get_link = ethtool_op_get_link,
+ .get_ts_info = ethtool_op_get_ts_info,
+ .get_ringparam = vector_get_ringparam,
+ .get_strings = vector_get_strings,
+ .get_sset_count = vector_get_sset_count,
+ .get_ethtool_stats = vector_get_ethtool_stats,
+ .get_coalesce = vector_get_coalesce,
+ .set_coalesce = vector_set_coalesce,
+};
+
+
+static const struct net_device_ops vector_netdev_ops = {
+ .ndo_open = vector_net_open,
+ .ndo_stop = vector_net_close,
+ .ndo_start_xmit = vector_net_start_xmit,
+ .ndo_set_rx_mode = vector_net_set_multicast_list,
+ .ndo_tx_timeout = vector_net_tx_timeout,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_fix_features = vector_fix_features,
+ .ndo_set_features = vector_set_features,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = vector_net_poll_controller,
+#endif
+};
+
+
+static void vector_timer_expire(struct timer_list *t)
+{
+ struct vector_private *vp = from_timer(vp, t, tl);
+
+ vp->estats.tx_kicks++;
+ vector_send(vp->tx_queue);
+}
+
+static void vector_eth_configure(
+ int n,
+ struct arglist *def
+ )
+{
+ struct vector_device *device;
+ struct net_device *dev;
+ struct vector_private *vp;
+ int err;
+
+ device = kzalloc(sizeof(*device), GFP_KERNEL);
+ if (device == NULL) {
+ printk(KERN_ERR "eth_configure failed to allocate struct "
+ "vector_device\n");
+ return;
+ }
+ dev = alloc_etherdev(sizeof(struct vector_private));
+ if (dev == NULL) {
+ printk(KERN_ERR "eth_configure: failed to allocate struct "
+ "net_device for vec%d\n", n);
+ goto out_free_device;
+ }
+
+ dev->mtu = get_mtu(def);
+
+ INIT_LIST_HEAD(&device->list);
+ device->unit = n;
+
+ /* If this name ends up conflicting with an existing registered
+ * netdevice, that is OK, register_netdev{,ice}() will notice this
+ * and fail.
+ */
+ snprintf(dev->name, sizeof(dev->name), "vec%d", n);
+ uml_net_setup_etheraddr(dev, uml_vector_fetch_arg(def, "mac"));
+ vp = netdev_priv(dev);
+
+ /* sysfs register */
+ if (!driver_registered) {
+ platform_driver_register(¨_net_driver);
+ driver_registered = 1;
+ }
+ device->pdev.id = n;
+ device->pdev.name = DRIVER_NAME;
+ device->pdev.dev.release = vector_device_release;
+ dev_set_drvdata(&device->pdev.dev, device);
+ if (platform_device_register(&device->pdev))
+ goto out_free_netdev;
+ SET_NETDEV_DEV(dev, &device->pdev.dev);
+
+ device->dev = dev;
+
+ *vp = ((struct vector_private)
+ {
+ .list = LIST_HEAD_INIT(vp->list),
+ .dev = dev,
+ .unit = n,
+ .options = get_transport_options(def),
+ .rx_irq = 0,
+ .tx_irq = 0,
+ .parsed = def,
+ .max_packet = get_mtu(def) + ETH_HEADER_OTHER,
+ /* TODO - we need to calculate headroom so that ip header
+ * is 16 byte aligned all the time
+ */
+ .headroom = get_headroom(def),
+ .form_header = NULL,
+ .verify_header = NULL,
+ .header_rxbuffer = NULL,
+ .header_txbuffer = NULL,
+ .header_size = 0,
+ .rx_header_size = 0,
+ .rexmit_scheduled = false,
+ .opened = false,
+ .transport_data = NULL,
+ .in_write_poll = false,
+ .coalesce = 2,
+ .req_size = get_req_size(def)
+ });
+
+ dev->features = dev->hw_features = (NETIF_F_SG | NETIF_F_FRAGLIST);
+ tasklet_init(&vp->tx_poll, vector_tx_poll, (unsigned long)vp);
+ INIT_WORK(&vp->reset_tx, vector_reset_tx);
+
+ timer_setup(&vp->tl, vector_timer_expire, 0);
+ spin_lock_init(&vp->lock);
+
+ /* FIXME */
+ dev->netdev_ops = &vector_netdev_ops;
+ dev->ethtool_ops = &vector_net_ethtool_ops;
+ dev->watchdog_timeo = (HZ >> 1);
+ /* primary IRQ - fixme */
+ dev->irq = 0; /* we will adjust this once opened */
+
+ rtnl_lock();
+ err = register_netdevice(dev);
+ rtnl_unlock();
+ if (err)
+ goto out_undo_user_init;
+
+ spin_lock(&vector_devices_lock);
+ list_add(&device->list, &vector_devices);
+ spin_unlock(&vector_devices_lock);
+
+ return;
+
+out_undo_user_init:
+ return;
+out_free_netdev:
+ free_netdev(dev);
+out_free_device:
+ kfree(device);
+}
+
+
+
+
+/*
+ * Invoked late in the init
+ */
+
+static int __init vector_init(void)
+{
+ struct list_head *ele;
+ struct vector_cmd_line_arg *def;
+ struct arglist *parsed;
+
+ list_for_each(ele, &vec_cmd_line) {
+ def = list_entry(ele, struct vector_cmd_line_arg, list);
+ parsed = uml_parse_vector_ifspec(def->arguments);
+ if (parsed != NULL)
+ vector_eth_configure(def->unit, parsed);
+ }
+ return 0;
+}
+
+
+/* Invoked at initial argument parsing, only stores
+ * arguments until a proper vector_init is called
+ * later
+ */
+
+static int __init vector_setup(char *str)
+{
+ char *error;
+ int n, err;
+ struct vector_cmd_line_arg *new;
+
+ err = vector_parse(str, &n, &str, &error);
+ if (err) {
+ printk(KERN_ERR "vector_setup - Couldn't parse '%s' : %s\n",
+ str, error);
+ return 1;
+ }
+ new = alloc_bootmem(sizeof(*new));
+ INIT_LIST_HEAD(&new->list);
+ new->unit = n;
+ new->arguments = str;
+ list_add_tail(&new->list, &vec_cmd_line);
+ return 1;
+}
+
+__setup("vec", vector_setup);
+__uml_help(vector_setup,
+"vec[0-9]+:<option>=<value>,<option>=<value>\n"
+" Configure a vector io network device.\n\n"
+);
+
+late_initcall(vector_init);
+
+static struct mc_device vector_mc = {
+ .list = LIST_HEAD_INIT(vector_mc.list),
+ .name = "vec",
+ .config = vector_config,
+ .get_config = NULL,
+ .id = vector_id,
+ .remove = vector_remove,
+};
+
+#ifdef CONFIG_INET
+static int vector_inetaddr_event(
+ struct notifier_block *this,
+ unsigned long event,
+ void *ptr)
+{
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block vector_inetaddr_notifier = {
+ .notifier_call = vector_inetaddr_event,
+};
+
+static void inet_register(void)
+{
+ register_inetaddr_notifier(&vector_inetaddr_notifier);
+}
+#else
+static inline void inet_register(void)
+{
+}
+#endif
+
+static int vector_net_init(void)
+{
+ mconsole_register_dev(&vector_mc);
+ inet_register();
+ return 0;
+}
+
+__initcall(vector_net_init);
+
+
+
diff --git a/arch/um/drivers/vector_kern.h b/arch/um/drivers/vector_kern.h
new file mode 100644
index 0000000..0b0a767
--- /dev/null
+++ b/arch/um/drivers/vector_kern.h
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2002 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_VECTOR_KERN_H
+#define __UM_VECTOR_KERN_H
+
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/skbuff.h>
+#include <linux/socket.h>
+#include <linux/list.h>
+#include <linux/ctype.h>
+#include <linux/workqueue.h>
+#include <linux/interrupt.h>
+#include "vector_user.h"
+
+/* Queue structure specially adapted for multiple enqueue/dequeue
+ * in a mmsgrecv/mmsgsend context
+ */
+
+/* Dequeue method */
+
+#define QUEUE_SENDMSG 0
+#define QUEUE_SENDMMSG 1
+
+#define VECTOR_RX 1
+#define VECTOR_TX (1 << 1)
+#define VECTOR_BPF (1 << 2)
+#define VECTOR_QDISC_BYPASS (1 << 3)
+
+#define ETH_MAX_PACKET 1500
+#define ETH_HEADER_OTHER 32 /* just in case someone decides to go mad on QnQ */
+
+struct vector_queue {
+ struct mmsghdr *mmsg_vector;
+ void **skbuff_vector;
+ /* backlink to device which owns us */
+ struct net_device *dev;
+ spinlock_t head_lock;
+ spinlock_t tail_lock;
+ int queue_depth, head, tail, max_depth, max_iov_frags;
+ short options;
+};
+
+struct vector_estats {
+ uint64_t rx_queue_max;
+ uint64_t rx_queue_running_average;
+ uint64_t tx_queue_max;
+ uint64_t tx_queue_running_average;
+ uint64_t rx_encaps_errors;
+ uint64_t tx_timeout_count;
+ uint64_t tx_restart_queue;
+ uint64_t tx_kicks;
+ uint64_t tx_flow_control_xon;
+ uint64_t tx_flow_control_xoff;
+ uint64_t rx_csum_offload_good;
+ uint64_t rx_csum_offload_errors;
+ uint64_t sg_ok;
+ uint64_t sg_linearized;
+};
+
+#define VERIFY_HEADER_NOK -1
+#define VERIFY_HEADER_OK 0
+#define VERIFY_CSUM_OK 1
+
+struct vector_private {
+ struct list_head list;
+ spinlock_t lock;
+ struct net_device *dev;
+
+ int unit;
+
+ /* Timeout timer in TX */
+
+ struct timer_list tl;
+
+ /* Scheduled "remove device" work */
+ struct work_struct reset_tx;
+ struct vector_fds *fds;
+
+ struct vector_queue *rx_queue;
+ struct vector_queue *tx_queue;
+
+ int rx_irq;
+ int tx_irq;
+
+ struct arglist *parsed;
+
+ void *transport_data; /* transport specific params if needed */
+
+ int max_packet;
+ int req_size; /* different from max packet - used for TSO */
+ int headroom;
+
+ int options;
+
+ /* remote address if any - some transports will leave this as null */
+
+ int header_size;
+ int rx_header_size;
+ int coalesce;
+
+ void *header_rxbuffer;
+ void *header_txbuffer;
+
+ int (*form_header)(uint8_t *header,
+ struct sk_buff *skb, struct vector_private *vp);
+ int (*verify_header)(uint8_t *header,
+ struct sk_buff *skb, struct vector_private *vp);
+
+ spinlock_t stats_lock;
+
+ struct tasklet_struct tx_poll;
+ bool rexmit_scheduled;
+ bool opened;
+ bool in_write_poll;
+
+ /* ethtool stats */
+
+ struct vector_estats estats;
+ void *bpf;
+
+ char user[0];
+};
+
+extern int build_transport_data(struct vector_private *vp);
+
+#endif
diff --git a/arch/um/drivers/vector_transports.c b/arch/um/drivers/vector_transports.c
new file mode 100644
index 0000000..77e4ebc
--- /dev/null
+++ b/arch/um/drivers/vector_transports.c
@@ -0,0 +1,459 @@
+/*
+ * Copyright (C) 2017 - Cambridge Greys Limited
+ * Copyright (C) 2011 - 2014 Cisco Systems Inc
+ * Licensed under the GPL.
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <asm/byteorder.h>
+#include <uapi/linux/ip.h>
+#include <uapi/linux/virtio_net.h>
+#include <linux/virtio_net.h>
+#include <linux/virtio_byteorder.h>
+#include <linux/netdev_features.h>
+#include "vector_user.h"
+#include "vector_kern.h"
+
+#define GOOD_LINEAR 512
+#define GSO_ERROR "Incoming GSO frames and GRO disabled on the interface"
+
+struct gre_minimal_header {
+ uint16_t header;
+ uint16_t arptype;
+};
+
+
+struct uml_gre_data {
+ uint32_t rx_key;
+ uint32_t tx_key;
+ uint32_t sequence;
+
+ bool ipv6;
+ bool has_sequence;
+ bool pin_sequence;
+ bool checksum;
+ bool key;
+ struct gre_minimal_header expected_header;
+
+ uint32_t checksum_offset;
+ uint32_t key_offset;
+ uint32_t sequence_offset;
+
+};
+
+struct uml_l2tpv3_data {
+ uint64_t rx_cookie;
+ uint64_t tx_cookie;
+ uint64_t rx_session;
+ uint64_t tx_session;
+ uint32_t counter;
+
+ bool udp;
+ bool ipv6;
+ bool has_counter;
+ bool pin_counter;
+ bool cookie;
+ bool cookie_is_64;
+
+ uint32_t cookie_offset;
+ uint32_t session_offset;
+ uint32_t counter_offset;
+};
+
+static int l2tpv3_form_header(uint8_t *header,
+ struct sk_buff *skb, struct vector_private *vp)
+{
+ struct uml_l2tpv3_data *td = vp->transport_data;
+ uint32_t *counter;
+
+ if (td->udp)
+ *(uint32_t *) header = cpu_to_be32(L2TPV3_DATA_PACKET);
+ (*(uint32_t *) (header + td->session_offset)) = td->tx_session;
+
+ if (td->cookie) {
+ if (td->cookie_is_64)
+ (*(uint64_t *)(header + td->cookie_offset)) =
+ td->tx_cookie;
+ else
+ (*(uint32_t *)(header + td->cookie_offset)) =
+ td->tx_cookie;
+ }
+ if (td->has_counter) {
+ counter = (uint32_t *)(header + td->counter_offset);
+ if (td->pin_counter) {
+ *counter = 0;
+ } else {
+ td->counter++;
+ *counter = cpu_to_be32(td->counter);
+ }
+ }
+ return 0;
+}
+
+static int gre_form_header(uint8_t *header,
+ struct sk_buff *skb, struct vector_private *vp)
+{
+ struct uml_gre_data *td = vp->transport_data;
+ uint32_t *sequence;
+ *((uint32_t *) header) = *((uint32_t *) &td->expected_header);
+ if (td->key)
+ (*(uint32_t *) (header + td->key_offset)) = td->tx_key;
+ if (td->has_sequence) {
+ sequence = (uint32_t *)(header + td->sequence_offset);
+ if (td->pin_sequence)
+ *sequence = 0;
+ else
+ *sequence = cpu_to_be32(++td->sequence);
+ }
+ return 0;
+}
+
+static int raw_form_header(uint8_t *header,
+ struct sk_buff *skb, struct vector_private *vp)
+{
+ struct virtio_net_hdr *vheader = (struct virtio_net_hdr *) header;
+
+ virtio_net_hdr_from_skb(
+ skb,
+ vheader,
+ virtio_legacy_is_little_endian(),
+ false,
+ 0
+ );
+
+ return 0;
+}
+
+static int l2tpv3_verify_header(
+ uint8_t *header, struct sk_buff *skb, struct vector_private *vp)
+{
+ struct uml_l2tpv3_data *td = vp->transport_data;
+ uint32_t *session;
+ uint64_t cookie;
+
+ if ((!td->udp) && (!td->ipv6))
+ header += sizeof(struct iphdr) /* fix for ipv4 raw */;
+
+ /* we do not do a strict check for "data" packets as per
+ * the RFC spec because the pure IP spec does not have
+ * that anyway.
+ */
+
+ if (td->cookie) {
+ if (td->cookie_is_64)
+ cookie = *(uint64_t *)(header + td->cookie_offset);
+ else
+ cookie = *(uint32_t *)(header + td->cookie_offset);
+ if (cookie != td->rx_cookie) {
+ if (net_ratelimit())
+ netdev_err(vp->dev, "uml_l2tpv3: unknown cookie id");
+ return -1;
+ }
+ }
+ session = (uint32_t *) (header + td->session_offset);
+ if (*session != td->rx_session) {
+ if (net_ratelimit())
+ netdev_err(vp->dev, "uml_l2tpv3: session mismatch");
+ return -1;
+ }
+ return 0;
+}
+
+static int gre_verify_header(
+ uint8_t *header, struct sk_buff *skb, struct vector_private *vp)
+{
+
+ uint32_t key;
+ struct uml_gre_data *td = vp->transport_data;
+
+ if (!td->ipv6)
+ header += sizeof(struct iphdr) /* fix for ipv4 raw */;
+
+ if (*((uint32_t *) header) != *((uint32_t *) &td->expected_header)) {
+ if (net_ratelimit())
+ netdev_err(vp->dev, "header type disagreement, expecting %0x, got %0x",
+ *((uint32_t *) &td->expected_header),
+ *((uint32_t *) header)
+ );
+ return -1;
+ }
+
+ if (td->key) {
+ key = (*(uint32_t *)(header + td->key_offset));
+ if (key != td->rx_key) {
+ if (net_ratelimit())
+ netdev_err(vp->dev, "unknown key id %0x, expecting %0x",
+ key, td->rx_key);
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static int raw_verify_header(
+ uint8_t *header, struct sk_buff *skb, struct vector_private *vp)
+{
+ struct virtio_net_hdr *vheader = (struct virtio_net_hdr *) header;
+
+ if ((vheader->gso_type != VIRTIO_NET_HDR_GSO_NONE) &&
+ (vp->req_size != 65536)) {
+ if (net_ratelimit())
+ netdev_err(
+ vp->dev,
+ GSO_ERROR
+ );
+ }
+ if ((vheader->flags & VIRTIO_NET_HDR_F_DATA_VALID) > 0)
+ return 1;
+
+ virtio_net_hdr_to_skb(skb, vheader, virtio_legacy_is_little_endian());
+ return 0;
+}
+
+static bool get_uint_param(
+ struct arglist *def, char *param, unsigned int *result)
+{
+ char *arg = uml_vector_fetch_arg(def, param);
+
+ if (arg != NULL) {
+ if (kstrtoint(arg, 0, result) == 0)
+ return true;
+ }
+ return false;
+}
+
+static bool get_ulong_param(
+ struct arglist *def, char *param, unsigned long *result)
+{
+ char *arg = uml_vector_fetch_arg(def, param);
+
+ if (arg != NULL) {
+ if (kstrtoul(arg, 0, result) == 0)
+ return true;
+ return true;
+ }
+ return false;
+}
+
+static int build_gre_transport_data(struct vector_private *vp)
+{
+ struct uml_gre_data *td;
+ int temp_int;
+ int temp_rx;
+ int temp_tx;
+
+ vp->transport_data = kmalloc(sizeof(struct uml_gre_data), GFP_KERNEL);
+ if (vp->transport_data == NULL)
+ return -ENOMEM;
+ td = vp->transport_data;
+ td->sequence = 0;
+
+ td->expected_header.arptype = GRE_IRB;
+ td->expected_header.header = 0;
+
+ vp->form_header = &gre_form_header;
+ vp->verify_header = &gre_verify_header;
+ vp->header_size = 4;
+ td->key_offset = 4;
+ td->sequence_offset = 4;
+ td->checksum_offset = 4;
+
+ td->ipv6 = false;
+ if (get_uint_param(vp->parsed, "v6", &temp_int)) {
+ if (temp_int > 0)
+ td->ipv6 = true;
+ }
+ td->key = false;
+ if (get_uint_param(vp->parsed, "rx_key", &temp_rx)) {
+ if (get_uint_param(vp->parsed, "tx_key", &temp_tx)) {
+ td->key = true;
+ td->expected_header.header |= GRE_MODE_KEY;
+ td->rx_key = cpu_to_be32(temp_rx);
+ td->tx_key = cpu_to_be32(temp_tx);
+ vp->header_size += 4;
+ td->sequence_offset += 4;
+ } else {
+ return -EINVAL;
+ }
+ }
+
+ td->sequence = false;
+ if (get_uint_param(vp->parsed, "sequence", &temp_int)) {
+ if (temp_int > 0) {
+ vp->header_size += 4;
+ td->has_sequence = true;
+ td->expected_header.header |= GRE_MODE_SEQUENCE;
+ if (get_uint_param(
+ vp->parsed, "pin_sequence", &temp_int)) {
+ if (temp_int > 0)
+ td->pin_sequence = true;
+ }
+ }
+ }
+ vp->rx_header_size = vp->header_size;
+ if (!td->ipv6)
+ vp->rx_header_size += sizeof(struct iphdr);
+ return 0;
+}
+
+static int build_l2tpv3_transport_data(struct vector_private *vp)
+{
+
+ struct uml_l2tpv3_data *td;
+ int temp_int, temp_rxs, temp_txs;
+ unsigned long temp_rx;
+ unsigned long temp_tx;
+
+ vp->transport_data = kmalloc(
+ sizeof(struct uml_l2tpv3_data), GFP_KERNEL);
+
+ if (vp->transport_data == NULL)
+ return -ENOMEM;
+
+ td = vp->transport_data;
+
+ vp->form_header = &l2tpv3_form_header;
+ vp->verify_header = &l2tpv3_verify_header;
+ td->counter = 0;
+
+ vp->header_size = 4;
+ td->session_offset = 0;
+ td->cookie_offset = 4;
+ td->counter_offset = 4;
+
+
+ td->ipv6 = false;
+ if (get_uint_param(vp->parsed, "v6", &temp_int)) {
+ if (temp_int > 0)
+ td->ipv6 = true;
+ }
+
+ if (get_uint_param(vp->parsed, "rx_session", &temp_rxs)) {
+ if (get_uint_param(vp->parsed, "tx_session", &temp_txs)) {
+ td->tx_session = cpu_to_be32(temp_txs);
+ td->rx_session = cpu_to_be32(temp_rxs);
+ } else {
+ return -EINVAL;
+ }
+ } else {
+ return -EINVAL;
+ }
+
+ td->cookie_is_64 = false;
+ if (get_uint_param(vp->parsed, "cookie64", &temp_int)) {
+ if (temp_int > 0)
+ td->cookie_is_64 = true;
+ }
+ td->cookie = false;
+ if (get_ulong_param(vp->parsed, "rx_cookie", &temp_rx)) {
+ if (get_ulong_param(vp->parsed, "tx_cookie", &temp_tx)) {
+ td->cookie = true;
+ if (td->cookie_is_64) {
+ td->rx_cookie = cpu_to_be64(temp_rx);
+ td->tx_cookie = cpu_to_be64(temp_tx);
+ vp->header_size += 8;
+ td->counter_offset += 8;
+ } else {
+ td->rx_cookie = cpu_to_be32(temp_rx);
+ td->tx_cookie = cpu_to_be32(temp_tx);
+ vp->header_size += 4;
+ td->counter_offset += 4;
+ }
+ } else {
+ return -EINVAL;
+ }
+ }
+
+ td->has_counter = false;
+ if (get_uint_param(vp->parsed, "counter", &temp_int)) {
+ if (temp_int > 0) {
+ td->has_counter = true;
+ vp->header_size += 4;
+ if (get_uint_param(
+ vp->parsed, "pin_counter", &temp_int)) {
+ if (temp_int > 0)
+ td->pin_counter = true;
+ }
+ }
+ }
+
+ if (get_uint_param(vp->parsed, "udp", &temp_int)) {
+ if (temp_int > 0) {
+ td->udp = true;
+ vp->header_size += 4;
+ td->counter_offset += 4;
+ td->session_offset += 4;
+ td->cookie_offset += 4;
+ }
+ }
+
+ vp->rx_header_size = vp->header_size;
+ if ((!td->ipv6) && (!td->udp))
+ vp->rx_header_size += sizeof(struct iphdr);
+
+ return 0;
+}
+
+static int build_raw_transport_data(struct vector_private *vp)
+{
+ if (uml_raw_enable_vnet_headers(vp->fds->rx_fd)) {
+ if (!uml_raw_enable_vnet_headers(vp->fds->tx_fd))
+ return -1;
+ vp->form_header = &raw_form_header;
+ vp->verify_header = &raw_verify_header;
+ vp->header_size = sizeof(struct virtio_net_hdr);
+ vp->rx_header_size = sizeof(struct virtio_net_hdr);
+ vp->dev->hw_features |= (NETIF_F_TSO | NETIF_F_GRO);
+ vp->dev->features |=
+ (NETIF_F_RXCSUM | NETIF_F_HW_CSUM |
+ NETIF_F_TSO | NETIF_F_GRO);
+ netdev_info(
+ vp->dev,
+ "raw: using vnet headers for tso and tx/rx checksum"
+ );
+ }
+ return 0;
+}
+
+static int build_tap_transport_data(struct vector_private *vp)
+{
+ if (uml_raw_enable_vnet_headers(vp->fds->rx_fd)) {
+ vp->form_header = &raw_form_header;
+ vp->verify_header = &raw_verify_header;
+ vp->header_size = sizeof(struct virtio_net_hdr);
+ vp->rx_header_size = sizeof(struct virtio_net_hdr);
+ vp->dev->hw_features |=
+ (NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GRO);
+ vp->dev->features |=
+ (NETIF_F_RXCSUM | NETIF_F_HW_CSUM |
+ NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GRO);
+ netdev_info(
+ vp->dev,
+ "tap/raw: using vnet headers for tso and tx/rx checksum"
+ );
+ } else {
+ return 0; /* do not try to enable tap too if raw failed */
+ }
+ if (uml_tap_enable_vnet_headers(vp->fds->tx_fd))
+ return 0;
+ return -1;
+}
+
+int build_transport_data(struct vector_private *vp)
+{
+ char *transport = uml_vector_fetch_arg(vp->parsed, "transport");
+
+ if (strncmp(transport, TRANS_GRE, TRANS_GRE_LEN) == 0)
+ return build_gre_transport_data(vp);
+ if (strncmp(transport, TRANS_L2TPV3, TRANS_L2TPV3_LEN) == 0)
+ return build_l2tpv3_transport_data(vp);
+ if (strncmp(transport, TRANS_RAW, TRANS_RAW_LEN) == 0)
+ return build_raw_transport_data(vp);
+ if (strncmp(transport, TRANS_TAP, TRANS_TAP_LEN) == 0)
+ return build_tap_transport_data(vp);
+ return 0;
+}
+
diff --git a/arch/um/drivers/vector_user.c b/arch/um/drivers/vector_user.c
new file mode 100644
index 0000000..4d6a78e
--- /dev/null
+++ b/arch/um/drivers/vector_user.c
@@ -0,0 +1,590 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <stddef.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <linux/if_tun.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <net/ethernet.h>
+#include <netinet/ip.h>
+#include <netinet/ether.h>
+#include <linux/if_ether.h>
+#include <linux/if_packet.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <linux/virtio_net.h>
+#include <netdb.h>
+#include <stdlib.h>
+#include <os.h>
+#include <um_malloc.h>
+#include "vector_user.h"
+
+#define ID_GRE 0
+#define ID_L2TPV3 1
+#define ID_MAX 1
+
+#define TOKEN_IFNAME "ifname"
+
+#define TRANS_RAW "raw"
+#define TRANS_RAW_LEN strlen(TRANS_RAW)
+
+#define VNET_HDR_FAIL "could not enable vnet headers on fd %d"
+#define TUN_GET_F_FAIL "tapraw: TUNGETFEATURES failed: %s"
+#define L2TPV3_BIND_FAIL "l2tpv3_open : could not bind socket err=%i"
+#define BPF_ATTACH_FAIL "Failed to attach filter size %d to %d, err %d\n"
+
+/* This is very ugly and brute force lookup, but it is done
+ * only once at initialization so not worth doing hashes or
+ * anything more intelligent
+ */
+
+char *uml_vector_fetch_arg(struct arglist *ifspec, char *token)
+{
+ int i;
+
+ for (i = 0; i < ifspec->numargs; i++) {
+ if (strcmp(ifspec->tokens[i], token) == 0)
+ return ifspec->values[i];
+ }
+ return NULL;
+
+}
+
+struct arglist *uml_parse_vector_ifspec(char *arg)
+{
+ struct arglist *result;
+ int pos, len;
+ bool parsing_token = true, next_starts = true;
+
+ if (arg == NULL)
+ return NULL;
+ result = uml_kmalloc(sizeof(struct arglist), UM_GFP_KERNEL);
+ if (result == NULL)
+ return NULL;
+ result->numargs = 0;
+ len = strlen(arg);
+ for (pos = 0; pos < len; pos++) {
+ if (next_starts) {
+ if (parsing_token) {
+ result->tokens[result->numargs] = arg + pos;
+ } else {
+ result->values[result->numargs] = arg + pos;
+ result->numargs++;
+ }
+ next_starts = false;
+ }
+ if (*(arg + pos) == '=') {
+ if (parsing_token)
+ parsing_token = false;
+ else
+ goto cleanup;
+ next_starts = true;
+ (*(arg + pos)) = '\0';
+ }
+ if (*(arg + pos) == ',') {
+ parsing_token = true;
+ next_starts = true;
+ (*(arg + pos)) = '\0';
+ }
+ }
+ return result;
+cleanup:
+ printk(UM_KERN_ERR "vector_setup - Couldn't parse '%s'\n", arg);
+ kfree(result);
+ return NULL;
+}
+
+/*
+ * Socket/FD configuration functions. These return an structure
+ * of rx and tx descriptors to cover cases where these are not
+ * the same (f.e. read via raw socket and write via tap).
+ */
+
+#define PATH_NET_TUN "/dev/net/tun"
+
+static struct vector_fds *user_init_tap_fds(struct arglist *ifspec)
+{
+ struct ifreq ifr;
+ int fd = -1;
+ struct sockaddr_ll sock;
+ int err = -ENOMEM, offload;
+ char *iface;
+ struct vector_fds *result = NULL;
+
+ iface = uml_vector_fetch_arg(ifspec, TOKEN_IFNAME);
+ if (iface == NULL) {
+ printk(UM_KERN_ERR "uml_tap: failed to parse interface spec\n");
+ goto tap_cleanup;
+ }
+
+ result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
+ if (result == NULL) {
+ printk(UM_KERN_ERR "uml_tap: failed to allocate file descriptors\n");
+ goto tap_cleanup;
+ }
+ result->rx_fd = -1;
+ result->tx_fd = -1;
+ result->remote_addr = NULL;
+ result->remote_addr_size = 0;
+
+ /* TAP */
+
+ fd = open(PATH_NET_TUN, O_RDWR);
+ if (fd < 0) {
+ printk(UM_KERN_ERR "uml_tap: failed to open tun device\n");
+ goto tap_cleanup;
+ }
+ result->tx_fd = fd;
+ memset(&ifr, 0, sizeof(ifr));
+ ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR;
+ strncpy((char *)&ifr.ifr_name, iface, sizeof(ifr.ifr_name) - 1);
+
+ err = ioctl(fd, TUNSETIFF, (void *) &ifr);
+ if (err != 0) {
+ printk(UM_KERN_ERR "uml_tap: failed to select tap interface\n");
+ goto tap_cleanup;
+ }
+
+ offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6;
+ ioctl(fd, TUNSETOFFLOAD, offload);
+
+ /* RAW */
+
+ fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
+ if (fd == -1) {
+ printk(UM_KERN_ERR
+ "uml_tap: failed to create socket: %i\n", -errno);
+ goto tap_cleanup;
+ }
+ result->rx_fd = fd;
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy((char *)&ifr.ifr_name, iface, sizeof(ifr.ifr_name) - 1);
+ if (ioctl(fd, SIOCGIFINDEX, (void *) &ifr) < 0) {
+ printk(UM_KERN_ERR
+ "uml_tap: failed to set interface: %i\n", -errno);
+ goto tap_cleanup;
+ }
+
+ sock.sll_family = AF_PACKET;
+ sock.sll_protocol = htons(ETH_P_ALL);
+ sock.sll_ifindex = ifr.ifr_ifindex;
+
+ if (bind(fd,
+ (struct sockaddr *) &sock, sizeof(struct sockaddr_ll)) < 0) {
+ printk(UM_KERN_ERR
+ "user_init_tap: failed to bind raw pair, err %d\n",
+ -errno);
+ goto tap_cleanup;
+ }
+ return result;
+tap_cleanup:
+ printk(UM_KERN_ERR "user_init_tap: init failed, error %d", err);
+ if (result != NULL) {
+ if (result->rx_fd >= 0)
+ os_close_file(result->rx_fd);
+ if (result->tx_fd >= 0)
+ os_close_file(result->tx_fd);
+ kfree(result);
+ }
+ return NULL;
+}
+
+
+static struct vector_fds *user_init_raw_fds(struct arglist *ifspec)
+{
+ struct ifreq ifr;
+ int rxfd = -1, txfd = -1;
+ struct sockaddr_ll sock;
+ int err = -ENOMEM;
+ char *iface;
+ struct vector_fds *result = NULL;
+
+ iface = uml_vector_fetch_arg(ifspec, TOKEN_IFNAME);
+ if (iface == NULL)
+ goto cleanup;
+
+ rxfd = socket(AF_PACKET, SOCK_RAW, ETH_P_ALL);
+ if (rxfd == -1) {
+ err = -errno;
+ goto cleanup;
+ }
+ txfd = socket(AF_PACKET, SOCK_RAW, 0); /* Turn off RX on this fd */
+ if (txfd == -1) {
+ err = -errno;
+ goto cleanup;
+ }
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy((char *)&ifr.ifr_name, iface, sizeof(ifr.ifr_name) - 1);
+ if (ioctl(rxfd, SIOCGIFINDEX, (void *) &ifr) < 0) {
+ err = -errno;
+ goto cleanup;
+ }
+
+ sock.sll_family = AF_PACKET;
+ sock.sll_protocol = htons(ETH_P_ALL);
+ sock.sll_ifindex = ifr.ifr_ifindex;
+
+ if (bind(rxfd,
+ (struct sockaddr *) &sock, sizeof(struct sockaddr_ll)) < 0) {
+ err = -errno;
+ goto cleanup;
+ }
+
+ sock.sll_family = AF_PACKET;
+ sock.sll_protocol = htons(ETH_P_IP);
+ sock.sll_ifindex = ifr.ifr_ifindex;
+
+ if (bind(txfd,
+ (struct sockaddr *) &sock, sizeof(struct sockaddr_ll)) < 0) {
+ err = -errno;
+ goto cleanup;
+ }
+
+ result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
+ if (result != NULL) {
+ result->rx_fd = rxfd;
+ result->tx_fd = txfd;
+ result->remote_addr = NULL;
+ result->remote_addr_size = 0;
+ }
+ return result;
+cleanup:
+ printk(UM_KERN_ERR "user_init_raw: init failed, error %d", err);
+ if (rxfd >= 0)
+ os_close_file(rxfd);
+ if (txfd >= 0)
+ os_close_file(txfd);
+ if (result != NULL)
+ kfree(result);
+ return NULL;
+}
+
+
+bool uml_raw_enable_qdisc_bypass(int fd)
+{
+ int optval = 1;
+
+ if (setsockopt(fd,
+ SOL_PACKET, PACKET_QDISC_BYPASS,
+ &optval, sizeof(optval)) != 0) {
+ return false;
+ }
+ return true;
+}
+
+bool uml_raw_enable_vnet_headers(int fd)
+{
+ int optval = 1;
+
+ if (setsockopt(fd,
+ SOL_PACKET, PACKET_VNET_HDR,
+ &optval, sizeof(optval)) != 0) {
+ printk(UM_KERN_INFO VNET_HDR_FAIL, fd);
+ return false;
+ }
+ return true;
+}
+bool uml_tap_enable_vnet_headers(int fd)
+{
+ unsigned int features;
+ int len = sizeof(struct virtio_net_hdr);
+
+ if (ioctl(fd, TUNGETFEATURES, &features) == -1) {
+ printk(UM_KERN_INFO TUN_GET_F_FAIL, strerror(errno));
+ return false;
+ }
+ if ((features & IFF_VNET_HDR) == 0) {
+ printk(UM_KERN_INFO "tapraw: No VNET HEADER support");
+ return false;
+ }
+ ioctl(fd, TUNSETVNETHDRSZ, &len);
+ return true;
+}
+
+static struct vector_fds *user_init_socket_fds(struct arglist *ifspec, int id)
+{
+ int err = -ENOMEM;
+ int fd = -1, gairet;
+ struct addrinfo srchints;
+ struct addrinfo dsthints;
+ bool v6, udp;
+ char *value;
+ char *src, *dst, *srcport, *dstport;
+ struct addrinfo *gairesult = NULL;
+ struct vector_fds *result = NULL;
+
+
+ value = uml_vector_fetch_arg(ifspec, "v6");
+ v6 = false;
+ udp = false;
+ if (value != NULL) {
+ if (strtol((const char *) value, NULL, 10) > 0)
+ v6 = true;
+ }
+
+ value = uml_vector_fetch_arg(ifspec, "udp");
+ if (value != NULL) {
+ if (strtol((const char *) value, NULL, 10) > 0)
+ udp = true;
+ }
+ src = uml_vector_fetch_arg(ifspec, "src");
+ dst = uml_vector_fetch_arg(ifspec, "dst");
+ srcport = uml_vector_fetch_arg(ifspec, "srcport");
+ dstport = uml_vector_fetch_arg(ifspec, "dstport");
+
+ memset(&dsthints, 0, sizeof(dsthints));
+
+ if (v6)
+ dsthints.ai_family = AF_INET6;
+ else
+ dsthints.ai_family = AF_INET;
+
+ switch (id) {
+ case ID_GRE:
+ dsthints.ai_socktype = SOCK_RAW;
+ dsthints.ai_protocol = IPPROTO_GRE;
+ break;
+ case ID_L2TPV3:
+ if (udp) {
+ dsthints.ai_socktype = SOCK_DGRAM;
+ dsthints.ai_protocol = 0;
+ } else {
+ dsthints.ai_socktype = SOCK_RAW;
+ dsthints.ai_protocol = IPPROTO_L2TP;
+ }
+ break;
+ default:
+ printk(KERN_ERR "Unsupported socket type\n");
+ return NULL;
+ }
+ memcpy(&srchints, &dsthints, sizeof(struct addrinfo));
+
+ gairet = getaddrinfo(src, srcport, &dsthints, &gairesult);
+ if ((gairet != 0) || (gairesult == NULL)) {
+ printk(UM_KERN_ERR
+ "socket_open : could not resolve src, error = %s",
+ gai_strerror(gairet)
+ );
+ return NULL;
+ }
+ fd = socket(gairesult->ai_family,
+ gairesult->ai_socktype, gairesult->ai_protocol);
+ if (fd == -1) {
+ printk(UM_KERN_ERR
+ "socket_open : could not open socket, error = %d",
+ -errno
+ );
+ goto cleanup;
+ }
+ if (bind(fd,
+ (struct sockaddr *) gairesult->ai_addr,
+ gairesult->ai_addrlen)) {
+ printk(UM_KERN_ERR L2TPV3_BIND_FAIL, errno);
+ goto cleanup;
+ }
+
+ if (gairesult != NULL)
+ freeaddrinfo(gairesult);
+
+ gairesult = NULL;
+
+ gairet = getaddrinfo(dst, dstport, &dsthints, &gairesult);
+ if ((gairet != 0) || (gairesult == NULL)) {
+ printk(UM_KERN_ERR
+ "socket_open : could not resolve dst, error = %s",
+ gai_strerror(gairet)
+ );
+ return NULL;
+ }
+
+ result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
+ if (result != NULL) {
+ result->rx_fd = fd;
+ result->tx_fd = fd;
+ result->remote_addr = uml_kmalloc(
+ gairesult->ai_addrlen, UM_GFP_KERNEL);
+ if (result->remote_addr == NULL)
+ goto cleanup;
+ result->remote_addr_size = gairesult->ai_addrlen;
+ memcpy(
+ result->remote_addr,
+ gairesult->ai_addr,
+ gairesult->ai_addrlen
+ );
+ }
+ freeaddrinfo(gairesult);
+ return result;
+cleanup:
+ if (gairesult != NULL)
+ freeaddrinfo(gairesult);
+ printk(UM_KERN_ERR "user_init_socket: init failed, error %d", err);
+ if (fd >= 0)
+ os_close_file(fd);
+ if (result != NULL) {
+ if (result->remote_addr != NULL)
+ kfree(result->remote_addr);
+ kfree(result);
+ }
+ return NULL;
+}
+
+struct vector_fds *uml_vector_user_open(
+ int unit,
+ struct arglist *parsed
+)
+{
+ char *transport;
+
+ if (parsed == NULL) {
+ printk(UM_KERN_ERR "no parsed config for unit %d\n", unit);
+ return NULL;
+ }
+ transport = uml_vector_fetch_arg(parsed, "transport");
+ if (transport == NULL) {
+ printk(UM_KERN_ERR "missing transport for unit %d\n", unit);
+ return NULL;
+ }
+ if (strncmp(transport, TRANS_RAW, TRANS_RAW_LEN) == 0)
+ return user_init_raw_fds(parsed);
+ if (strncmp(transport, TRANS_TAP, TRANS_TAP_LEN) == 0)
+ return user_init_tap_fds(parsed);
+ if (strncmp(transport, TRANS_GRE, TRANS_GRE_LEN) == 0)
+ return user_init_socket_fds(parsed, ID_GRE);
+ if (strncmp(transport, TRANS_L2TPV3, TRANS_L2TPV3_LEN) == 0)
+ return user_init_socket_fds(parsed, ID_L2TPV3);
+ return NULL;
+}
+
+
+int uml_vector_sendmsg(int fd, void *hdr, int flags)
+{
+ int n;
+
+ CATCH_EINTR(n = sendmsg(fd, (struct msghdr *) hdr, flags));
+ if ((n < 0) && (errno == EAGAIN))
+ return 0;
+ if (n >= 0)
+ return n;
+ else
+ return -errno;
+}
+
+int uml_vector_recvmsg(int fd, void *hdr, int flags)
+{
+ int n;
+
+ CATCH_EINTR(n = recvmsg(fd, (struct msghdr *) hdr, flags));
+ if ((n < 0) && (errno == EAGAIN))
+ return 0;
+ if (n >= 0)
+ return n;
+ else
+ return -errno;
+}
+
+int uml_vector_writev(int fd, void *hdr, int iovcount)
+{
+ int n;
+
+ CATCH_EINTR(n = writev(fd, (struct iovec *) hdr, iovcount));
+ if ((n < 0) && (errno == EAGAIN))
+ return 0;
+ if (n >= 0)
+ return n;
+ else
+ return -errno;
+}
+
+int uml_vector_sendmmsg(
+ int fd,
+ void *msgvec,
+ unsigned int vlen,
+ unsigned int flags)
+{
+ int n;
+
+ CATCH_EINTR(n = sendmmsg(fd, (struct mmsghdr *) msgvec, vlen, flags));
+ if ((n < 0) && (errno == EAGAIN))
+ return 0;
+ if (n >= 0)
+ return n;
+ else
+ return -errno;
+}
+
+int uml_vector_recvmmsg(
+ int fd,
+ void *msgvec,
+ unsigned int vlen,
+ unsigned int flags)
+{
+ int n;
+
+ CATCH_EINTR(
+ n = recvmmsg(fd, (struct mmsghdr *) msgvec, vlen, flags, 0));
+ if ((n < 0) && (errno == EAGAIN))
+ return 0;
+ if (n >= 0)
+ return n;
+ else
+ return -errno;
+}
+int uml_vector_attach_bpf(int fd, void *bpf, int bpf_len)
+{
+ int err = setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, bpf, bpf_len);
+
+ if (err < 0)
+ printk(KERN_ERR BPF_ATTACH_FAIL, bpf_len, fd, -errno);
+ return err;
+}
+
+#define DEFAULT_BPF_LEN 6
+
+void *uml_vector_default_bpf(int fd, void *mac)
+{
+ struct sock_filter *bpf;
+ uint32_t *mac1 = (uint32_t *)(mac + 2);
+ uint16_t *mac2 = (uint16_t *) mac;
+ struct sock_fprog bpf_prog = {
+ .len = 6,
+ .filter = NULL,
+ };
+
+ bpf = uml_kmalloc(
+ sizeof(struct sock_filter) * DEFAULT_BPF_LEN, UM_GFP_KERNEL);
+ if (bpf != NULL) {
+ bpf_prog.filter = bpf;
+ /* ld [8] */
+ bpf[0] = (struct sock_filter){ 0x20, 0, 0, 0x00000008 };
+ /* jeq #0xMAC[2-6] jt 2 jf 5*/
+ bpf[1] = (struct sock_filter){ 0x15, 0, 3, ntohl(*mac1)};
+ /* ldh [6] */
+ bpf[2] = (struct sock_filter){ 0x28, 0, 0, 0x00000006 };
+ /* jeq #0xMAC[0-1] jt 4 jf 5 */
+ bpf[3] = (struct sock_filter){ 0x15, 0, 1, ntohs(*mac2)};
+ /* ret #0 */
+ bpf[4] = (struct sock_filter){ 0x6, 0, 0, 0x00000000 };
+ /* ret #0x40000 */
+ bpf[5] = (struct sock_filter){ 0x6, 0, 0, 0x00040000 };
+ if (uml_vector_attach_bpf(
+ fd, &bpf_prog, sizeof(struct sock_fprog)) < 0) {
+ kfree(bpf);
+ bpf = NULL;
+ }
+ }
+ return bpf;
+}
+
diff --git a/arch/um/drivers/vector_user.h b/arch/um/drivers/vector_user.h
new file mode 100644
index 0000000..d7cbff7
--- /dev/null
+++ b/arch/um/drivers/vector_user.h
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2002 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_VECTOR_USER_H
+#define __UM_VECTOR_USER_H
+
+#define MAXVARGS 20
+
+#define TOKEN_IFNAME "ifname"
+
+#define TRANS_RAW "raw"
+#define TRANS_RAW_LEN strlen(TRANS_RAW)
+
+#define TRANS_TAP "tap"
+#define TRANS_TAP_LEN strlen(TRANS_TAP)
+
+
+#define TRANS_GRE "gre"
+#define TRANS_GRE_LEN strlen(TRANS_RAW)
+
+#define TRANS_L2TPV3 "l2tpv3"
+#define TRANS_L2TPV3_LEN strlen(TRANS_L2TPV3)
+
+#ifndef IPPROTO_GRE
+#define IPPROTO_GRE 0x2F
+#endif
+
+#define GRE_MODE_CHECKSUM cpu_to_be16(8 << 12) /* checksum */
+#define GRE_MODE_RESERVED cpu_to_be16(4 << 12) /* unused */
+#define GRE_MODE_KEY cpu_to_be16(2 << 12) /* KEY present */
+#define GRE_MODE_SEQUENCE cpu_to_be16(1 << 12) /* sequence */
+
+#define GRE_IRB cpu_to_be16(0x6558)
+
+#define L2TPV3_DATA_PACKET 0x30000
+
+/* IANA-assigned IP protocol ID for L2TPv3 */
+
+#ifndef IPPROTO_L2TP
+#define IPPROTO_L2TP 0x73
+#endif
+
+struct arglist {
+ int numargs;
+ char *tokens[MAXVARGS];
+ char *values[MAXVARGS];
+};
+
+/* Separating read and write FDs allows us to have different
+ * rx and tx method. Example - read tap via raw socket using
+ * recvmmsg, write using legacy tap write calls
+ */
+
+struct vector_fds {
+ int rx_fd;
+ int tx_fd;
+ void *remote_addr;
+ int remote_addr_size;
+};
+
+#define VECTOR_READ 1
+#define VECTOR_WRITE (1 < 1)
+#define VECTOR_HEADERS (1 < 2)
+
+extern struct arglist *uml_parse_vector_ifspec(char *arg);
+
+extern struct vector_fds *uml_vector_user_open(
+ int unit,
+ struct arglist *parsed
+);
+
+extern char *uml_vector_fetch_arg(
+ struct arglist *ifspec,
+ char *token
+);
+
+extern int uml_vector_recvmsg(int fd, void *hdr, int flags);
+extern int uml_vector_sendmsg(int fd, void *hdr, int flags);
+extern int uml_vector_writev(int fd, void *hdr, int iovcount);
+extern int uml_vector_sendmmsg(
+ int fd, void *msgvec,
+ unsigned int vlen,
+ unsigned int flags
+);
+extern int uml_vector_recvmmsg(
+ int fd,
+ void *msgvec,
+ unsigned int vlen,
+ unsigned int flags
+);
+extern void *uml_vector_default_bpf(int fd, void *mac);
+extern int uml_vector_attach_bpf(int fd, void *bpf, int bpf_len);
+extern bool uml_raw_enable_qdisc_bypass(int fd);
+extern bool uml_raw_enable_vnet_headers(int fd);
+extern bool uml_tap_enable_vnet_headers(int fd);
+
+
+#endif
diff --git a/arch/um/drivers/xterm.c b/arch/um/drivers/xterm.c
new file mode 100644
index 0000000..20e30be
--- /dev/null
+++ b/arch/um/drivers/xterm.c
@@ -0,0 +1,223 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <termios.h>
+#include "chan_user.h"
+#include <os.h>
+#include <um_malloc.h>
+#include "xterm.h"
+
+struct xterm_chan {
+ int pid;
+ int helper_pid;
+ char *title;
+ int device;
+ int raw;
+ struct termios tt;
+};
+
+static void *xterm_init(char *str, int device, const struct chan_opts *opts)
+{
+ struct xterm_chan *data;
+
+ data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
+ if (data == NULL)
+ return NULL;
+ *data = ((struct xterm_chan) { .pid = -1,
+ .helper_pid = -1,
+ .device = device,
+ .title = opts->xterm_title,
+ .raw = opts->raw } );
+ return data;
+}
+
+/* Only changed by xterm_setup, which is a setup */
+static char *terminal_emulator = "xterm";
+static char *title_switch = "-T";
+static char *exec_switch = "-e";
+
+static int __init xterm_setup(char *line, int *add)
+{
+ *add = 0;
+ terminal_emulator = line;
+
+ line = strchr(line, ',');
+ if (line == NULL)
+ return 0;
+
+ *line++ = '\0';
+ if (*line)
+ title_switch = line;
+
+ line = strchr(line, ',');
+ if (line == NULL)
+ return 0;
+
+ *line++ = '\0';
+ if (*line)
+ exec_switch = line;
+
+ return 0;
+}
+
+__uml_setup("xterm=", xterm_setup,
+"xterm=<terminal emulator>,<title switch>,<exec switch>\n"
+" Specifies an alternate terminal emulator to use for the debugger,\n"
+" consoles, and serial lines when they are attached to the xterm channel.\n"
+" The values are the terminal emulator binary, the switch it uses to set\n"
+" its title, and the switch it uses to execute a subprocess,\n"
+" respectively. The title switch must have the form '<switch> title',\n"
+" not '<switch>=title'. Similarly, the exec switch must have the form\n"
+" '<switch> command arg1 arg2 ...'.\n"
+" The default values are 'xterm=xterm,-T,-e'. Values for gnome-terminal\n"
+" are 'xterm=gnome-terminal,-t,-x'.\n\n"
+);
+
+static int xterm_open(int input, int output, int primary, void *d,
+ char **dev_out)
+{
+ struct xterm_chan *data = d;
+ int pid, fd, new, err;
+ char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
+ char *argv[] = { terminal_emulator, title_switch, title, exec_switch,
+ OS_LIB_PATH "/uml/port-helper", "-uml-socket",
+ file, NULL };
+
+ if (access(argv[4], X_OK) < 0)
+ argv[4] = "port-helper";
+
+ /*
+ * Check that DISPLAY is set, this doesn't guarantee the xterm
+ * will work but w/o it we can be pretty sure it won't.
+ */
+ if (getenv("DISPLAY") == NULL) {
+ printk(UM_KERN_ERR "xterm_open: $DISPLAY not set.\n");
+ return -ENODEV;
+ }
+
+ /*
+ * This business of getting a descriptor to a temp file,
+ * deleting the file and closing the descriptor is just to get
+ * a known-unused name for the Unix socket that we really
+ * want.
+ */
+ fd = mkstemp(file);
+ if (fd < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "xterm_open : mkstemp failed, errno = %d\n",
+ errno);
+ return err;
+ }
+
+ if (unlink(file)) {
+ err = -errno;
+ printk(UM_KERN_ERR "xterm_open : unlink failed, errno = %d\n",
+ errno);
+ close(fd);
+ return err;
+ }
+ close(fd);
+
+ fd = os_create_unix_socket(file, sizeof(file), 1);
+ if (fd < 0) {
+ printk(UM_KERN_ERR "xterm_open : create_unix_socket failed, "
+ "errno = %d\n", -fd);
+ return fd;
+ }
+
+ sprintf(title, data->title, data->device);
+ pid = run_helper(NULL, NULL, argv);
+ if (pid < 0) {
+ err = pid;
+ printk(UM_KERN_ERR "xterm_open : run_helper failed, "
+ "errno = %d\n", -err);
+ goto out_close1;
+ }
+
+ err = os_set_fd_block(fd, 0);
+ if (err < 0) {
+ printk(UM_KERN_ERR "xterm_open : failed to set descriptor "
+ "non-blocking, err = %d\n", -err);
+ goto out_kill;
+ }
+
+ new = xterm_fd(fd, &data->helper_pid);
+ if (new < 0) {
+ err = new;
+ printk(UM_KERN_ERR "xterm_open : os_rcv_fd failed, err = %d\n",
+ -err);
+ goto out_kill;
+ }
+
+ err = os_set_fd_block(new, 0);
+ if (err) {
+ printk(UM_KERN_ERR "xterm_open : failed to set xterm "
+ "descriptor non-blocking, err = %d\n", -err);
+ goto out_close2;
+ }
+
+ CATCH_EINTR(err = tcgetattr(new, &data->tt));
+ if (err) {
+ new = err;
+ goto out_close2;
+ }
+
+ if (data->raw) {
+ err = raw(new);
+ if (err) {
+ new = err;
+ goto out_close2;
+ }
+ }
+
+ unlink(file);
+ data->pid = pid;
+ *dev_out = NULL;
+
+ return new;
+
+ out_close2:
+ close(new);
+ out_kill:
+ os_kill_process(pid, 1);
+ out_close1:
+ close(fd);
+
+ return err;
+}
+
+static void xterm_close(int fd, void *d)
+{
+ struct xterm_chan *data = d;
+
+ if (data->pid != -1)
+ os_kill_process(data->pid, 1);
+ data->pid = -1;
+
+ if (data->helper_pid != -1)
+ os_kill_process(data->helper_pid, 0);
+ data->helper_pid = -1;
+
+ os_close_file(fd);
+}
+
+const struct chan_ops xterm_ops = {
+ .type = "xterm",
+ .init = xterm_init,
+ .open = xterm_open,
+ .close = xterm_close,
+ .read = generic_read,
+ .write = generic_write,
+ .console_write = generic_console_write,
+ .window_size = generic_window_size,
+ .free = generic_free,
+ .winch = 1,
+};
diff --git a/arch/um/drivers/xterm.h b/arch/um/drivers/xterm.h
new file mode 100644
index 0000000..56b9c4a
--- /dev/null
+++ b/arch/um/drivers/xterm.h
@@ -0,0 +1,12 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __XTERM_H__
+#define __XTERM_H__
+
+extern int xterm_fd(int socket, int *pid_out);
+
+#endif
+
diff --git a/arch/um/drivers/xterm_kern.c b/arch/um/drivers/xterm_kern.c
new file mode 100644
index 0000000..e8f9957
--- /dev/null
+++ b/arch/um/drivers/xterm_kern.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/slab.h>
+#include <linux/completion.h>
+#include <linux/irqreturn.h>
+#include <asm/irq.h>
+#include <irq_kern.h>
+#include <os.h>
+
+struct xterm_wait {
+ struct completion ready;
+ int fd;
+ int pid;
+ int new_fd;
+};
+
+static irqreturn_t xterm_interrupt(int irq, void *data)
+{
+ struct xterm_wait *xterm = data;
+ int fd;
+
+ fd = os_rcv_fd(xterm->fd, &xterm->pid);
+ if (fd == -EAGAIN)
+ return IRQ_NONE;
+
+ xterm->new_fd = fd;
+ complete(&xterm->ready);
+
+ return IRQ_HANDLED;
+}
+
+int xterm_fd(int socket, int *pid_out)
+{
+ struct xterm_wait *data;
+ int err, ret;
+
+ data = kmalloc(sizeof(*data), GFP_KERNEL);
+ if (data == NULL) {
+ printk(KERN_ERR "xterm_fd : failed to allocate xterm_wait\n");
+ return -ENOMEM;
+ }
+
+ /* This is a locked semaphore... */
+ *data = ((struct xterm_wait) { .fd = socket,
+ .pid = -1,
+ .new_fd = -1 });
+ init_completion(&data->ready);
+
+ err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt,
+ IRQF_SHARED, "xterm", data);
+ if (err) {
+ printk(KERN_ERR "xterm_fd : failed to get IRQ for xterm, "
+ "err = %d\n", err);
+ ret = err;
+ goto out;
+ }
+
+ /* ... so here we wait for an xterm interrupt.
+ *
+ * XXX Note, if the xterm doesn't work for some reason (eg. DISPLAY
+ * isn't set) this will hang... */
+ wait_for_completion(&data->ready);
+
+ um_free_irq(XTERM_IRQ, data);
+
+ ret = data->new_fd;
+ *pid_out = data->pid;
+ out:
+ kfree(data);
+
+ return ret;
+}