v4.19.13 snapshot.
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
new file mode 100644
index 0000000..6b7539c
--- /dev/null
+++ b/net/sunrpc/xprtsock.c
@@ -0,0 +1,3377 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/net/sunrpc/xprtsock.c
+ *
+ * Client-side transport implementation for sockets.
+ *
+ * TCP callback races fixes (C) 1998 Red Hat
+ * TCP send fixes (C) 1998 Red Hat
+ * TCP NFS related read + write fixes
+ * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
+ *
+ * Rewrite of larges part of the code in order to stabilize TCP stuff.
+ * Fix behaviour when socket buffer is full.
+ * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
+ *
+ * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
+ *
+ * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
+ * <gilles.quillard@bull.net>
+ */
+
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/capability.h>
+#include <linux/pagemap.h>
+#include <linux/errno.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/net.h>
+#include <linux/mm.h>
+#include <linux/un.h>
+#include <linux/udp.h>
+#include <linux/tcp.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/xprtsock.h>
+#include <linux/file.h>
+#ifdef CONFIG_SUNRPC_BACKCHANNEL
+#include <linux/sunrpc/bc_xprt.h>
+#endif
+
+#include <net/sock.h>
+#include <net/checksum.h>
+#include <net/udp.h>
+#include <net/tcp.h>
+
+#include <trace/events/sunrpc.h>
+
+#include "sunrpc.h"
+
+#define RPC_TCP_READ_CHUNK_SZ (3*512*1024)
+
+static void xs_close(struct rpc_xprt *xprt);
+static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
+ struct socket *sock);
+
+/*
+ * xprtsock tunables
+ */
+static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
+static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
+static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
+
+static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
+static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+
+#define XS_TCP_LINGER_TO (15U * HZ)
+static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
+
+/*
+ * We can register our own files under /proc/sys/sunrpc by
+ * calling register_sysctl_table() again. The files in that
+ * directory become the union of all files registered there.
+ *
+ * We simply need to make sure that we don't collide with
+ * someone else's file names!
+ */
+
+static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
+static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
+static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
+static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
+static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
+
+static struct ctl_table_header *sunrpc_table_header;
+
+/*
+ * FIXME: changing the UDP slot table size should also resize the UDP
+ * socket buffers for existing UDP transports
+ */
+static struct ctl_table xs_tunables_table[] = {
+ {
+ .procname = "udp_slot_table_entries",
+ .data = &xprt_udp_slot_table_entries,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_slot_table_size,
+ .extra2 = &max_slot_table_size
+ },
+ {
+ .procname = "tcp_slot_table_entries",
+ .data = &xprt_tcp_slot_table_entries,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_slot_table_size,
+ .extra2 = &max_slot_table_size
+ },
+ {
+ .procname = "tcp_max_slot_table_entries",
+ .data = &xprt_max_tcp_slot_table_entries,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_slot_table_size,
+ .extra2 = &max_tcp_slot_table_limit
+ },
+ {
+ .procname = "min_resvport",
+ .data = &xprt_min_resvport,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &xprt_min_resvport_limit,
+ .extra2 = &xprt_max_resvport
+ },
+ {
+ .procname = "max_resvport",
+ .data = &xprt_max_resvport,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &xprt_min_resvport,
+ .extra2 = &xprt_max_resvport_limit
+ },
+ {
+ .procname = "tcp_fin_timeout",
+ .data = &xs_tcp_fin_timeout,
+ .maxlen = sizeof(xs_tcp_fin_timeout),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ { },
+};
+
+static struct ctl_table sunrpc_table[] = {
+ {
+ .procname = "sunrpc",
+ .mode = 0555,
+ .child = xs_tunables_table
+ },
+ { },
+};
+
+#endif
+
+/*
+ * Wait duration for a reply from the RPC portmapper.
+ */
+#define XS_BIND_TO (60U * HZ)
+
+/*
+ * Delay if a UDP socket connect error occurs. This is most likely some
+ * kind of resource problem on the local host.
+ */
+#define XS_UDP_REEST_TO (2U * HZ)
+
+/*
+ * The reestablish timeout allows clients to delay for a bit before attempting
+ * to reconnect to a server that just dropped our connection.
+ *
+ * We implement an exponential backoff when trying to reestablish a TCP
+ * transport connection with the server. Some servers like to drop a TCP
+ * connection when they are overworked, so we start with a short timeout and
+ * increase over time if the server is down or not responding.
+ */
+#define XS_TCP_INIT_REEST_TO (3U * HZ)
+
+/*
+ * TCP idle timeout; client drops the transport socket if it is idle
+ * for this long. Note that we also timeout UDP sockets to prevent
+ * holding port numbers when there is no RPC traffic.
+ */
+#define XS_IDLE_DISC_TO (5U * 60 * HZ)
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# undef RPC_DEBUG_DATA
+# define RPCDBG_FACILITY RPCDBG_TRANS
+#endif
+
+#ifdef RPC_DEBUG_DATA
+static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
+{
+ u8 *buf = (u8 *) packet;
+ int j;
+
+ dprintk("RPC: %s\n", msg);
+ for (j = 0; j < count && j < 128; j += 4) {
+ if (!(j & 31)) {
+ if (j)
+ dprintk("\n");
+ dprintk("0x%04x ", j);
+ }
+ dprintk("%02x%02x%02x%02x ",
+ buf[j], buf[j+1], buf[j+2], buf[j+3]);
+ }
+ dprintk("\n");
+}
+#else
+static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
+{
+ /* NOP */
+}
+#endif
+
+static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
+{
+ return (struct rpc_xprt *) sk->sk_user_data;
+}
+
+static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
+{
+ return (struct sockaddr *) &xprt->addr;
+}
+
+static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
+{
+ return (struct sockaddr_un *) &xprt->addr;
+}
+
+static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
+{
+ return (struct sockaddr_in *) &xprt->addr;
+}
+
+static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
+{
+ return (struct sockaddr_in6 *) &xprt->addr;
+}
+
+static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
+{
+ struct sockaddr *sap = xs_addr(xprt);
+ struct sockaddr_in6 *sin6;
+ struct sockaddr_in *sin;
+ struct sockaddr_un *sun;
+ char buf[128];
+
+ switch (sap->sa_family) {
+ case AF_LOCAL:
+ sun = xs_addr_un(xprt);
+ strlcpy(buf, sun->sun_path, sizeof(buf));
+ xprt->address_strings[RPC_DISPLAY_ADDR] =
+ kstrdup(buf, GFP_KERNEL);
+ break;
+ case AF_INET:
+ (void)rpc_ntop(sap, buf, sizeof(buf));
+ xprt->address_strings[RPC_DISPLAY_ADDR] =
+ kstrdup(buf, GFP_KERNEL);
+ sin = xs_addr_in(xprt);
+ snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
+ break;
+ case AF_INET6:
+ (void)rpc_ntop(sap, buf, sizeof(buf));
+ xprt->address_strings[RPC_DISPLAY_ADDR] =
+ kstrdup(buf, GFP_KERNEL);
+ sin6 = xs_addr_in6(xprt);
+ snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
+ break;
+ default:
+ BUG();
+ }
+
+ xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
+}
+
+static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
+{
+ struct sockaddr *sap = xs_addr(xprt);
+ char buf[128];
+
+ snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
+ xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
+
+ snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
+ xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
+}
+
+static void xs_format_peer_addresses(struct rpc_xprt *xprt,
+ const char *protocol,
+ const char *netid)
+{
+ xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
+ xprt->address_strings[RPC_DISPLAY_NETID] = netid;
+ xs_format_common_peer_addresses(xprt);
+ xs_format_common_peer_ports(xprt);
+}
+
+static void xs_update_peer_port(struct rpc_xprt *xprt)
+{
+ kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
+ kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
+
+ xs_format_common_peer_ports(xprt);
+}
+
+static void xs_free_peer_addresses(struct rpc_xprt *xprt)
+{
+ unsigned int i;
+
+ for (i = 0; i < RPC_DISPLAY_MAX; i++)
+ switch (i) {
+ case RPC_DISPLAY_PROTO:
+ case RPC_DISPLAY_NETID:
+ continue;
+ default:
+ kfree(xprt->address_strings[i]);
+ }
+}
+
+#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
+
+static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
+{
+ struct msghdr msg = {
+ .msg_name = addr,
+ .msg_namelen = addrlen,
+ .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
+ };
+ struct kvec iov = {
+ .iov_base = vec->iov_base + base,
+ .iov_len = vec->iov_len - base,
+ };
+
+ if (iov.iov_len != 0)
+ return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
+ return kernel_sendmsg(sock, &msg, NULL, 0, 0);
+}
+
+static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
+{
+ ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
+ int offset, size_t size, int flags);
+ struct page **ppage;
+ unsigned int remainder;
+ int err;
+
+ remainder = xdr->page_len - base;
+ base += xdr->page_base;
+ ppage = xdr->pages + (base >> PAGE_SHIFT);
+ base &= ~PAGE_MASK;
+ do_sendpage = sock->ops->sendpage;
+ if (!zerocopy)
+ do_sendpage = sock_no_sendpage;
+ for(;;) {
+ unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
+ int flags = XS_SENDMSG_FLAGS;
+
+ remainder -= len;
+ if (more)
+ flags |= MSG_MORE;
+ if (remainder != 0)
+ flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE;
+ err = do_sendpage(sock, *ppage, base, len, flags);
+ if (remainder == 0 || err != len)
+ break;
+ *sent_p += err;
+ ppage++;
+ base = 0;
+ }
+ if (err > 0) {
+ *sent_p += err;
+ err = 0;
+ }
+ return err;
+}
+
+/**
+ * xs_sendpages - write pages directly to a socket
+ * @sock: socket to send on
+ * @addr: UDP only -- address of destination
+ * @addrlen: UDP only -- length of destination address
+ * @xdr: buffer containing this request
+ * @base: starting position in the buffer
+ * @zerocopy: true if it is safe to use sendpage()
+ * @sent_p: return the total number of bytes successfully queued for sending
+ *
+ */
+static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p)
+{
+ unsigned int remainder = xdr->len - base;
+ int err = 0;
+ int sent = 0;
+
+ if (unlikely(!sock))
+ return -ENOTSOCK;
+
+ if (base != 0) {
+ addr = NULL;
+ addrlen = 0;
+ }
+
+ if (base < xdr->head[0].iov_len || addr != NULL) {
+ unsigned int len = xdr->head[0].iov_len - base;
+ remainder -= len;
+ err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
+ if (remainder == 0 || err != len)
+ goto out;
+ *sent_p += err;
+ base = 0;
+ } else
+ base -= xdr->head[0].iov_len;
+
+ if (base < xdr->page_len) {
+ unsigned int len = xdr->page_len - base;
+ remainder -= len;
+ err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
+ *sent_p += sent;
+ if (remainder == 0 || sent != len)
+ goto out;
+ base = 0;
+ } else
+ base -= xdr->page_len;
+
+ if (base >= xdr->tail[0].iov_len)
+ return 0;
+ err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
+out:
+ if (err > 0) {
+ *sent_p += err;
+ err = 0;
+ }
+ return err;
+}
+
+static void xs_nospace_callback(struct rpc_task *task)
+{
+ struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
+
+ transport->inet->sk_write_pending--;
+}
+
+/**
+ * xs_nospace - place task on wait queue if transmit was incomplete
+ * @task: task to put to sleep
+ *
+ */
+static int xs_nospace(struct rpc_task *task)
+{
+ struct rpc_rqst *req = task->tk_rqstp;
+ struct rpc_xprt *xprt = req->rq_xprt;
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+ struct sock *sk = transport->inet;
+ int ret = -EAGAIN;
+
+ dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
+ task->tk_pid, req->rq_slen - req->rq_bytes_sent,
+ req->rq_slen);
+
+ /* Protect against races with write_space */
+ spin_lock_bh(&xprt->transport_lock);
+
+ /* Don't race with disconnect */
+ if (xprt_connected(xprt)) {
+ /* wait for more buffer space */
+ sk->sk_write_pending++;
+ xprt_wait_for_buffer_space(task, xs_nospace_callback);
+ } else
+ ret = -ENOTCONN;
+
+ spin_unlock_bh(&xprt->transport_lock);
+
+ /* Race breaker in case memory is freed before above code is called */
+ if (ret == -EAGAIN) {
+ struct socket_wq *wq;
+
+ rcu_read_lock();
+ wq = rcu_dereference(sk->sk_wq);
+ set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
+ rcu_read_unlock();
+
+ sk->sk_write_space(sk);
+ }
+ return ret;
+}
+
+/*
+ * Construct a stream transport record marker in @buf.
+ */
+static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
+{
+ u32 reclen = buf->len - sizeof(rpc_fraghdr);
+ rpc_fraghdr *base = buf->head[0].iov_base;
+ *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
+}
+
+/**
+ * xs_local_send_request - write an RPC request to an AF_LOCAL socket
+ * @task: RPC task that manages the state of an RPC request
+ *
+ * Return values:
+ * 0: The request has been sent
+ * EAGAIN: The socket was blocked, please call again later to
+ * complete the request
+ * ENOTCONN: Caller needs to invoke connect logic then call again
+ * other: Some other error occured, the request was not sent
+ */
+static int xs_local_send_request(struct rpc_task *task)
+{
+ struct rpc_rqst *req = task->tk_rqstp;
+ struct rpc_xprt *xprt = req->rq_xprt;
+ struct sock_xprt *transport =
+ container_of(xprt, struct sock_xprt, xprt);
+ struct xdr_buf *xdr = &req->rq_snd_buf;
+ int status;
+ int sent = 0;
+
+ xs_encode_stream_record_marker(&req->rq_snd_buf);
+
+ xs_pktdump("packet data:",
+ req->rq_svec->iov_base, req->rq_svec->iov_len);
+
+ req->rq_xtime = ktime_get();
+ status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
+ true, &sent);
+ dprintk("RPC: %s(%u) = %d\n",
+ __func__, xdr->len - req->rq_bytes_sent, status);
+
+ if (status == -EAGAIN && sock_writeable(transport->inet))
+ status = -ENOBUFS;
+
+ if (likely(sent > 0) || status == 0) {
+ req->rq_bytes_sent += sent;
+ req->rq_xmit_bytes_sent += sent;
+ if (likely(req->rq_bytes_sent >= req->rq_slen)) {
+ req->rq_bytes_sent = 0;
+ return 0;
+ }
+ status = -EAGAIN;
+ }
+
+ switch (status) {
+ case -ENOBUFS:
+ break;
+ case -EAGAIN:
+ status = xs_nospace(task);
+ break;
+ default:
+ dprintk("RPC: sendmsg returned unrecognized error %d\n",
+ -status);
+ /* fall through */
+ case -EPIPE:
+ xs_close(xprt);
+ status = -ENOTCONN;
+ }
+
+ return status;
+}
+
+/**
+ * xs_udp_send_request - write an RPC request to a UDP socket
+ * @task: address of RPC task that manages the state of an RPC request
+ *
+ * Return values:
+ * 0: The request has been sent
+ * EAGAIN: The socket was blocked, please call again later to
+ * complete the request
+ * ENOTCONN: Caller needs to invoke connect logic then call again
+ * other: Some other error occurred, the request was not sent
+ */
+static int xs_udp_send_request(struct rpc_task *task)
+{
+ struct rpc_rqst *req = task->tk_rqstp;
+ struct rpc_xprt *xprt = req->rq_xprt;
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+ struct xdr_buf *xdr = &req->rq_snd_buf;
+ int sent = 0;
+ int status;
+
+ xs_pktdump("packet data:",
+ req->rq_svec->iov_base,
+ req->rq_svec->iov_len);
+
+ if (!xprt_bound(xprt))
+ return -ENOTCONN;
+ req->rq_xtime = ktime_get();
+ status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
+ xdr, req->rq_bytes_sent, true, &sent);
+
+ dprintk("RPC: xs_udp_send_request(%u) = %d\n",
+ xdr->len - req->rq_bytes_sent, status);
+
+ /* firewall is blocking us, don't return -EAGAIN or we end up looping */
+ if (status == -EPERM)
+ goto process_status;
+
+ if (status == -EAGAIN && sock_writeable(transport->inet))
+ status = -ENOBUFS;
+
+ if (sent > 0 || status == 0) {
+ req->rq_xmit_bytes_sent += sent;
+ if (sent >= req->rq_slen)
+ return 0;
+ /* Still some bytes left; set up for a retry later. */
+ status = -EAGAIN;
+ }
+
+process_status:
+ switch (status) {
+ case -ENOTSOCK:
+ status = -ENOTCONN;
+ /* Should we call xs_close() here? */
+ break;
+ case -EAGAIN:
+ status = xs_nospace(task);
+ break;
+ case -ENETUNREACH:
+ case -ENOBUFS:
+ case -EPIPE:
+ case -ECONNREFUSED:
+ case -EPERM:
+ /* When the server has died, an ICMP port unreachable message
+ * prompts ECONNREFUSED. */
+ break;
+ default:
+ dprintk("RPC: sendmsg returned unrecognized error %d\n",
+ -status);
+ }
+
+ return status;
+}
+
+/**
+ * xs_tcp_send_request - write an RPC request to a TCP socket
+ * @task: address of RPC task that manages the state of an RPC request
+ *
+ * Return values:
+ * 0: The request has been sent
+ * EAGAIN: The socket was blocked, please call again later to
+ * complete the request
+ * ENOTCONN: Caller needs to invoke connect logic then call again
+ * other: Some other error occurred, the request was not sent
+ *
+ * XXX: In the case of soft timeouts, should we eventually give up
+ * if sendmsg is not able to make progress?
+ */
+static int xs_tcp_send_request(struct rpc_task *task)
+{
+ struct rpc_rqst *req = task->tk_rqstp;
+ struct rpc_xprt *xprt = req->rq_xprt;
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+ struct xdr_buf *xdr = &req->rq_snd_buf;
+ bool zerocopy = true;
+ bool vm_wait = false;
+ int status;
+ int sent;
+
+ xs_encode_stream_record_marker(&req->rq_snd_buf);
+
+ xs_pktdump("packet data:",
+ req->rq_svec->iov_base,
+ req->rq_svec->iov_len);
+ /* Don't use zero copy if this is a resend. If the RPC call
+ * completes while the socket holds a reference to the pages,
+ * then we may end up resending corrupted data.
+ */
+ if (task->tk_flags & RPC_TASK_SENT)
+ zerocopy = false;
+
+ if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
+ xs_tcp_set_socket_timeouts(xprt, transport->sock);
+
+ /* Continue transmitting the packet/record. We must be careful
+ * to cope with writespace callbacks arriving _after_ we have
+ * called sendmsg(). */
+ req->rq_xtime = ktime_get();
+ while (1) {
+ sent = 0;
+ status = xs_sendpages(transport->sock, NULL, 0, xdr,
+ req->rq_bytes_sent, zerocopy, &sent);
+
+ dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
+ xdr->len - req->rq_bytes_sent, status);
+
+ /* If we've sent the entire packet, immediately
+ * reset the count of bytes sent. */
+ req->rq_bytes_sent += sent;
+ req->rq_xmit_bytes_sent += sent;
+ if (likely(req->rq_bytes_sent >= req->rq_slen)) {
+ req->rq_bytes_sent = 0;
+ return 0;
+ }
+
+ WARN_ON_ONCE(sent == 0 && status == 0);
+
+ if (status == -EAGAIN ) {
+ /*
+ * Return EAGAIN if we're sure we're hitting the
+ * socket send buffer limits.
+ */
+ if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
+ break;
+ /*
+ * Did we hit a memory allocation failure?
+ */
+ if (sent == 0) {
+ status = -ENOBUFS;
+ if (vm_wait)
+ break;
+ /* Retry, knowing now that we're below the
+ * socket send buffer limit
+ */
+ vm_wait = true;
+ }
+ continue;
+ }
+ if (status < 0)
+ break;
+ vm_wait = false;
+ }
+
+ switch (status) {
+ case -ENOTSOCK:
+ status = -ENOTCONN;
+ /* Should we call xs_close() here? */
+ break;
+ case -EAGAIN:
+ status = xs_nospace(task);
+ break;
+ case -ECONNRESET:
+ case -ECONNREFUSED:
+ case -ENOTCONN:
+ case -EADDRINUSE:
+ case -ENOBUFS:
+ case -EPIPE:
+ break;
+ default:
+ dprintk("RPC: sendmsg returned unrecognized error %d\n",
+ -status);
+ }
+
+ return status;
+}
+
+/**
+ * xs_tcp_release_xprt - clean up after a tcp transmission
+ * @xprt: transport
+ * @task: rpc task
+ *
+ * This cleans up if an error causes us to abort the transmission of a request.
+ * In this case, the socket may need to be reset in order to avoid confusing
+ * the server.
+ */
+static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+ struct rpc_rqst *req;
+
+ if (task != xprt->snd_task)
+ return;
+ if (task == NULL)
+ goto out_release;
+ req = task->tk_rqstp;
+ if (req == NULL)
+ goto out_release;
+ if (req->rq_bytes_sent == 0)
+ goto out_release;
+ if (req->rq_bytes_sent == req->rq_snd_buf.len)
+ goto out_release;
+ set_bit(XPRT_CLOSE_WAIT, &xprt->state);
+out_release:
+ xprt_release_xprt(xprt, task);
+}
+
+static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
+{
+ transport->old_data_ready = sk->sk_data_ready;
+ transport->old_state_change = sk->sk_state_change;
+ transport->old_write_space = sk->sk_write_space;
+ transport->old_error_report = sk->sk_error_report;
+}
+
+static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
+{
+ sk->sk_data_ready = transport->old_data_ready;
+ sk->sk_state_change = transport->old_state_change;
+ sk->sk_write_space = transport->old_write_space;
+ sk->sk_error_report = transport->old_error_report;
+}
+
+static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+ clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
+}
+
+static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
+{
+ smp_mb__before_atomic();
+ clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
+ clear_bit(XPRT_CLOSING, &xprt->state);
+ xs_sock_reset_state_flags(xprt);
+ smp_mb__after_atomic();
+}
+
+/**
+ * xs_error_report - callback to handle TCP socket state errors
+ * @sk: socket
+ *
+ * Note: we don't call sock_error() since there may be a rpc_task
+ * using the socket, and so we don't want to clear sk->sk_err.
+ */
+static void xs_error_report(struct sock *sk)
+{
+ struct rpc_xprt *xprt;
+ int err;
+
+ read_lock_bh(&sk->sk_callback_lock);
+ if (!(xprt = xprt_from_sock(sk)))
+ goto out;
+
+ err = -sk->sk_err;
+ if (err == 0)
+ goto out;
+ dprintk("RPC: xs_error_report client %p, error=%d...\n",
+ xprt, -err);
+ trace_rpc_socket_error(xprt, sk->sk_socket, err);
+ xprt_wake_pending_tasks(xprt, err);
+ out:
+ read_unlock_bh(&sk->sk_callback_lock);
+}
+
+static void xs_reset_transport(struct sock_xprt *transport)
+{
+ struct socket *sock = transport->sock;
+ struct sock *sk = transport->inet;
+ struct rpc_xprt *xprt = &transport->xprt;
+
+ if (sk == NULL)
+ return;
+
+ if (atomic_read(&transport->xprt.swapper))
+ sk_clear_memalloc(sk);
+
+ kernel_sock_shutdown(sock, SHUT_RDWR);
+
+ mutex_lock(&transport->recv_mutex);
+ write_lock_bh(&sk->sk_callback_lock);
+ transport->inet = NULL;
+ transport->sock = NULL;
+
+ sk->sk_user_data = NULL;
+
+ xs_restore_old_callbacks(transport, sk);
+ xprt_clear_connected(xprt);
+ write_unlock_bh(&sk->sk_callback_lock);
+ xs_sock_reset_connection_flags(xprt);
+ mutex_unlock(&transport->recv_mutex);
+
+ trace_rpc_socket_close(xprt, sock);
+ sock_release(sock);
+}
+
+/**
+ * xs_close - close a socket
+ * @xprt: transport
+ *
+ * This is used when all requests are complete; ie, no DRC state remains
+ * on the server we want to save.
+ *
+ * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
+ * xs_reset_transport() zeroing the socket from underneath a writer.
+ */
+static void xs_close(struct rpc_xprt *xprt)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+ dprintk("RPC: xs_close xprt %p\n", xprt);
+
+ xs_reset_transport(transport);
+ xprt->reestablish_timeout = 0;
+
+ xprt_disconnect_done(xprt);
+}
+
+static void xs_inject_disconnect(struct rpc_xprt *xprt)
+{
+ dprintk("RPC: injecting transport disconnect on xprt=%p\n",
+ xprt);
+ xprt_disconnect_done(xprt);
+}
+
+static void xs_xprt_free(struct rpc_xprt *xprt)
+{
+ xs_free_peer_addresses(xprt);
+ xprt_free(xprt);
+}
+
+/**
+ * xs_destroy - prepare to shutdown a transport
+ * @xprt: doomed transport
+ *
+ */
+static void xs_destroy(struct rpc_xprt *xprt)
+{
+ struct sock_xprt *transport = container_of(xprt,
+ struct sock_xprt, xprt);
+ dprintk("RPC: xs_destroy xprt %p\n", xprt);
+
+ cancel_delayed_work_sync(&transport->connect_worker);
+ xs_close(xprt);
+ cancel_work_sync(&transport->recv_worker);
+ xs_xprt_free(xprt);
+ module_put(THIS_MODULE);
+}
+
+static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
+{
+ struct xdr_skb_reader desc = {
+ .skb = skb,
+ .offset = sizeof(rpc_fraghdr),
+ .count = skb->len - sizeof(rpc_fraghdr),
+ };
+
+ if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
+ return -1;
+ if (desc.count)
+ return -1;
+ return 0;
+}
+
+/**
+ * xs_local_data_read_skb
+ * @xprt: transport
+ * @sk: socket
+ * @skb: skbuff
+ *
+ * Currently this assumes we can read the whole reply in a single gulp.
+ */
+static void xs_local_data_read_skb(struct rpc_xprt *xprt,
+ struct sock *sk,
+ struct sk_buff *skb)
+{
+ struct rpc_task *task;
+ struct rpc_rqst *rovr;
+ int repsize, copied;
+ u32 _xid;
+ __be32 *xp;
+
+ repsize = skb->len - sizeof(rpc_fraghdr);
+ if (repsize < 4) {
+ dprintk("RPC: impossible RPC reply size %d\n", repsize);
+ return;
+ }
+
+ /* Copy the XID from the skb... */
+ xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
+ if (xp == NULL)
+ return;
+
+ /* Look up and lock the request corresponding to the given XID */
+ spin_lock(&xprt->recv_lock);
+ rovr = xprt_lookup_rqst(xprt, *xp);
+ if (!rovr)
+ goto out_unlock;
+ xprt_pin_rqst(rovr);
+ spin_unlock(&xprt->recv_lock);
+ task = rovr->rq_task;
+
+ copied = rovr->rq_private_buf.buflen;
+ if (copied > repsize)
+ copied = repsize;
+
+ if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
+ dprintk("RPC: sk_buff copy failed\n");
+ spin_lock(&xprt->recv_lock);
+ goto out_unpin;
+ }
+
+ spin_lock(&xprt->recv_lock);
+ xprt_complete_rqst(task, copied);
+out_unpin:
+ xprt_unpin_rqst(rovr);
+ out_unlock:
+ spin_unlock(&xprt->recv_lock);
+}
+
+static void xs_local_data_receive(struct sock_xprt *transport)
+{
+ struct sk_buff *skb;
+ struct sock *sk;
+ int err;
+
+restart:
+ mutex_lock(&transport->recv_mutex);
+ sk = transport->inet;
+ if (sk == NULL)
+ goto out;
+ for (;;) {
+ skb = skb_recv_datagram(sk, 0, 1, &err);
+ if (skb != NULL) {
+ xs_local_data_read_skb(&transport->xprt, sk, skb);
+ skb_free_datagram(sk, skb);
+ continue;
+ }
+ if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
+ break;
+ if (need_resched()) {
+ mutex_unlock(&transport->recv_mutex);
+ cond_resched();
+ goto restart;
+ }
+ }
+out:
+ mutex_unlock(&transport->recv_mutex);
+}
+
+static void xs_local_data_receive_workfn(struct work_struct *work)
+{
+ struct sock_xprt *transport =
+ container_of(work, struct sock_xprt, recv_worker);
+ xs_local_data_receive(transport);
+}
+
+/**
+ * xs_udp_data_read_skb - receive callback for UDP sockets
+ * @xprt: transport
+ * @sk: socket
+ * @skb: skbuff
+ *
+ */
+static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
+ struct sock *sk,
+ struct sk_buff *skb)
+{
+ struct rpc_task *task;
+ struct rpc_rqst *rovr;
+ int repsize, copied;
+ u32 _xid;
+ __be32 *xp;
+
+ repsize = skb->len;
+ if (repsize < 4) {
+ dprintk("RPC: impossible RPC reply size %d!\n", repsize);
+ return;
+ }
+
+ /* Copy the XID from the skb... */
+ xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
+ if (xp == NULL)
+ return;
+
+ /* Look up and lock the request corresponding to the given XID */
+ spin_lock(&xprt->recv_lock);
+ rovr = xprt_lookup_rqst(xprt, *xp);
+ if (!rovr)
+ goto out_unlock;
+ xprt_pin_rqst(rovr);
+ xprt_update_rtt(rovr->rq_task);
+ spin_unlock(&xprt->recv_lock);
+ task = rovr->rq_task;
+
+ if ((copied = rovr->rq_private_buf.buflen) > repsize)
+ copied = repsize;
+
+ /* Suck it into the iovec, verify checksum if not done by hw. */
+ if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
+ spin_lock(&xprt->recv_lock);
+ __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
+ goto out_unpin;
+ }
+
+
+ spin_lock_bh(&xprt->transport_lock);
+ xprt_adjust_cwnd(xprt, task, copied);
+ spin_unlock_bh(&xprt->transport_lock);
+ spin_lock(&xprt->recv_lock);
+ xprt_complete_rqst(task, copied);
+ __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
+out_unpin:
+ xprt_unpin_rqst(rovr);
+ out_unlock:
+ spin_unlock(&xprt->recv_lock);
+}
+
+static void xs_udp_data_receive(struct sock_xprt *transport)
+{
+ struct sk_buff *skb;
+ struct sock *sk;
+ int err;
+
+restart:
+ mutex_lock(&transport->recv_mutex);
+ sk = transport->inet;
+ if (sk == NULL)
+ goto out;
+ for (;;) {
+ skb = skb_recv_udp(sk, 0, 1, &err);
+ if (skb != NULL) {
+ xs_udp_data_read_skb(&transport->xprt, sk, skb);
+ consume_skb(skb);
+ continue;
+ }
+ if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
+ break;
+ if (need_resched()) {
+ mutex_unlock(&transport->recv_mutex);
+ cond_resched();
+ goto restart;
+ }
+ }
+out:
+ mutex_unlock(&transport->recv_mutex);
+}
+
+static void xs_udp_data_receive_workfn(struct work_struct *work)
+{
+ struct sock_xprt *transport =
+ container_of(work, struct sock_xprt, recv_worker);
+ xs_udp_data_receive(transport);
+}
+
+/**
+ * xs_data_ready - "data ready" callback for UDP sockets
+ * @sk: socket with data to read
+ *
+ */
+static void xs_data_ready(struct sock *sk)
+{
+ struct rpc_xprt *xprt;
+
+ read_lock_bh(&sk->sk_callback_lock);
+ dprintk("RPC: xs_data_ready...\n");
+ xprt = xprt_from_sock(sk);
+ if (xprt != NULL) {
+ struct sock_xprt *transport = container_of(xprt,
+ struct sock_xprt, xprt);
+ transport->old_data_ready(sk);
+ /* Any data means we had a useful conversation, so
+ * then we don't need to delay the next reconnect
+ */
+ if (xprt->reestablish_timeout)
+ xprt->reestablish_timeout = 0;
+ if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
+ queue_work(xprtiod_workqueue, &transport->recv_worker);
+ }
+ read_unlock_bh(&sk->sk_callback_lock);
+}
+
+/*
+ * Helper function to force a TCP close if the server is sending
+ * junk and/or it has put us in CLOSE_WAIT
+ */
+static void xs_tcp_force_close(struct rpc_xprt *xprt)
+{
+ xprt_force_disconnect(xprt);
+}
+
+static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+ size_t len, used;
+ char *p;
+
+ p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
+ len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
+ used = xdr_skb_read_bits(desc, p, len);
+ transport->tcp_offset += used;
+ if (used != len)
+ return;
+
+ transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
+ if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
+ transport->tcp_flags |= TCP_RCV_LAST_FRAG;
+ else
+ transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
+ transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
+
+ transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
+ transport->tcp_offset = 0;
+
+ /* Sanity check of the record length */
+ if (unlikely(transport->tcp_reclen < 8)) {
+ dprintk("RPC: invalid TCP record fragment length\n");
+ xs_tcp_force_close(xprt);
+ return;
+ }
+ dprintk("RPC: reading TCP record fragment of length %d\n",
+ transport->tcp_reclen);
+}
+
+static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
+{
+ if (transport->tcp_offset == transport->tcp_reclen) {
+ transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
+ transport->tcp_offset = 0;
+ if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
+ transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+ transport->tcp_flags |= TCP_RCV_COPY_XID;
+ transport->tcp_copied = 0;
+ }
+ }
+}
+
+static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
+{
+ size_t len, used;
+ char *p;
+
+ len = sizeof(transport->tcp_xid) - transport->tcp_offset;
+ dprintk("RPC: reading XID (%zu bytes)\n", len);
+ p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
+ used = xdr_skb_read_bits(desc, p, len);
+ transport->tcp_offset += used;
+ if (used != len)
+ return;
+ transport->tcp_flags &= ~TCP_RCV_COPY_XID;
+ transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
+ transport->tcp_copied = 4;
+ dprintk("RPC: reading %s XID %08x\n",
+ (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
+ : "request with",
+ ntohl(transport->tcp_xid));
+ xs_tcp_check_fraghdr(transport);
+}
+
+static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
+ struct xdr_skb_reader *desc)
+{
+ size_t len, used;
+ u32 offset;
+ char *p;
+
+ /*
+ * We want transport->tcp_offset to be 8 at the end of this routine
+ * (4 bytes for the xid and 4 bytes for the call/reply flag).
+ * When this function is called for the first time,
+ * transport->tcp_offset is 4 (after having already read the xid).
+ */
+ offset = transport->tcp_offset - sizeof(transport->tcp_xid);
+ len = sizeof(transport->tcp_calldir) - offset;
+ dprintk("RPC: reading CALL/REPLY flag (%zu bytes)\n", len);
+ p = ((char *) &transport->tcp_calldir) + offset;
+ used = xdr_skb_read_bits(desc, p, len);
+ transport->tcp_offset += used;
+ if (used != len)
+ return;
+ transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
+ /*
+ * We don't yet have the XDR buffer, so we will write the calldir
+ * out after we get the buffer from the 'struct rpc_rqst'
+ */
+ switch (ntohl(transport->tcp_calldir)) {
+ case RPC_REPLY:
+ transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
+ transport->tcp_flags |= TCP_RCV_COPY_DATA;
+ transport->tcp_flags |= TCP_RPC_REPLY;
+ break;
+ case RPC_CALL:
+ transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
+ transport->tcp_flags |= TCP_RCV_COPY_DATA;
+ transport->tcp_flags &= ~TCP_RPC_REPLY;
+ break;
+ default:
+ dprintk("RPC: invalid request message type\n");
+ xs_tcp_force_close(&transport->xprt);
+ }
+ xs_tcp_check_fraghdr(transport);
+}
+
+static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
+ struct xdr_skb_reader *desc,
+ struct rpc_rqst *req)
+{
+ struct sock_xprt *transport =
+ container_of(xprt, struct sock_xprt, xprt);
+ struct xdr_buf *rcvbuf;
+ size_t len;
+ ssize_t r;
+
+ rcvbuf = &req->rq_private_buf;
+
+ if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
+ /*
+ * Save the RPC direction in the XDR buffer
+ */
+ memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
+ &transport->tcp_calldir,
+ sizeof(transport->tcp_calldir));
+ transport->tcp_copied += sizeof(transport->tcp_calldir);
+ transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
+ }
+
+ len = desc->count;
+ if (len > transport->tcp_reclen - transport->tcp_offset)
+ desc->count = transport->tcp_reclen - transport->tcp_offset;
+ r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
+ desc, xdr_skb_read_bits);
+
+ if (desc->count) {
+ /* Error when copying to the receive buffer,
+ * usually because we weren't able to allocate
+ * additional buffer pages. All we can do now
+ * is turn off TCP_RCV_COPY_DATA, so the request
+ * will not receive any additional updates,
+ * and time out.
+ * Any remaining data from this record will
+ * be discarded.
+ */
+ transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+ dprintk("RPC: XID %08x truncated request\n",
+ ntohl(transport->tcp_xid));
+ dprintk("RPC: xprt = %p, tcp_copied = %lu, "
+ "tcp_offset = %u, tcp_reclen = %u\n",
+ xprt, transport->tcp_copied,
+ transport->tcp_offset, transport->tcp_reclen);
+ return;
+ }
+
+ transport->tcp_copied += r;
+ transport->tcp_offset += r;
+ desc->count = len - r;
+
+ dprintk("RPC: XID %08x read %zd bytes\n",
+ ntohl(transport->tcp_xid), r);
+ dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
+ "tcp_reclen = %u\n", xprt, transport->tcp_copied,
+ transport->tcp_offset, transport->tcp_reclen);
+
+ if (transport->tcp_copied == req->rq_private_buf.buflen)
+ transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+ else if (transport->tcp_offset == transport->tcp_reclen) {
+ if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
+ transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+ }
+}
+
+/*
+ * Finds the request corresponding to the RPC xid and invokes the common
+ * tcp read code to read the data.
+ */
+static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
+ struct xdr_skb_reader *desc)
+{
+ struct sock_xprt *transport =
+ container_of(xprt, struct sock_xprt, xprt);
+ struct rpc_rqst *req;
+
+ dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
+
+ /* Find and lock the request corresponding to this xid */
+ spin_lock(&xprt->recv_lock);
+ req = xprt_lookup_rqst(xprt, transport->tcp_xid);
+ if (!req) {
+ dprintk("RPC: XID %08x request not found!\n",
+ ntohl(transport->tcp_xid));
+ spin_unlock(&xprt->recv_lock);
+ return -1;
+ }
+ xprt_pin_rqst(req);
+ spin_unlock(&xprt->recv_lock);
+
+ xs_tcp_read_common(xprt, desc, req);
+
+ spin_lock(&xprt->recv_lock);
+ if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
+ xprt_complete_rqst(req->rq_task, transport->tcp_copied);
+ xprt_unpin_rqst(req);
+ spin_unlock(&xprt->recv_lock);
+ return 0;
+}
+
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+/*
+ * Obtains an rpc_rqst previously allocated and invokes the common
+ * tcp read code to read the data. The result is placed in the callback
+ * queue.
+ * If we're unable to obtain the rpc_rqst we schedule the closing of the
+ * connection and return -1.
+ */
+static int xs_tcp_read_callback(struct rpc_xprt *xprt,
+ struct xdr_skb_reader *desc)
+{
+ struct sock_xprt *transport =
+ container_of(xprt, struct sock_xprt, xprt);
+ struct rpc_rqst *req;
+
+ /* Look up the request corresponding to the given XID */
+ req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
+ if (req == NULL) {
+ printk(KERN_WARNING "Callback slot table overflowed\n");
+ xprt_force_disconnect(xprt);
+ return -1;
+ }
+
+ dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
+ xs_tcp_read_common(xprt, desc, req);
+
+ if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
+ xprt_complete_bc_request(req, transport->tcp_copied);
+
+ return 0;
+}
+
+static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
+ struct xdr_skb_reader *desc)
+{
+ struct sock_xprt *transport =
+ container_of(xprt, struct sock_xprt, xprt);
+
+ return (transport->tcp_flags & TCP_RPC_REPLY) ?
+ xs_tcp_read_reply(xprt, desc) :
+ xs_tcp_read_callback(xprt, desc);
+}
+
+static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net)
+{
+ int ret;
+
+ ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
+ SVC_SOCK_ANONYMOUS);
+ if (ret < 0)
+ return ret;
+ return 0;
+}
+
+static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
+{
+ return PAGE_SIZE;
+}
+#else
+static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
+ struct xdr_skb_reader *desc)
+{
+ return xs_tcp_read_reply(xprt, desc);
+}
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+
+/*
+ * Read data off the transport. This can be either an RPC_CALL or an
+ * RPC_REPLY. Relay the processing to helper functions.
+ */
+static void xs_tcp_read_data(struct rpc_xprt *xprt,
+ struct xdr_skb_reader *desc)
+{
+ struct sock_xprt *transport =
+ container_of(xprt, struct sock_xprt, xprt);
+
+ if (_xs_tcp_read_data(xprt, desc) == 0)
+ xs_tcp_check_fraghdr(transport);
+ else {
+ /*
+ * The transport_lock protects the request handling.
+ * There's no need to hold it to update the tcp_flags.
+ */
+ transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+ }
+}
+
+static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
+{
+ size_t len;
+
+ len = transport->tcp_reclen - transport->tcp_offset;
+ if (len > desc->count)
+ len = desc->count;
+ desc->count -= len;
+ desc->offset += len;
+ transport->tcp_offset += len;
+ dprintk("RPC: discarded %zu bytes\n", len);
+ xs_tcp_check_fraghdr(transport);
+}
+
+static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
+{
+ struct rpc_xprt *xprt = rd_desc->arg.data;
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+ struct xdr_skb_reader desc = {
+ .skb = skb,
+ .offset = offset,
+ .count = len,
+ };
+ size_t ret;
+
+ dprintk("RPC: xs_tcp_data_recv started\n");
+ do {
+ trace_xs_tcp_data_recv(transport);
+ /* Read in a new fragment marker if necessary */
+ /* Can we ever really expect to get completely empty fragments? */
+ if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
+ xs_tcp_read_fraghdr(xprt, &desc);
+ continue;
+ }
+ /* Read in the xid if necessary */
+ if (transport->tcp_flags & TCP_RCV_COPY_XID) {
+ xs_tcp_read_xid(transport, &desc);
+ continue;
+ }
+ /* Read in the call/reply flag */
+ if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
+ xs_tcp_read_calldir(transport, &desc);
+ continue;
+ }
+ /* Read in the request data */
+ if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
+ xs_tcp_read_data(xprt, &desc);
+ continue;
+ }
+ /* Skip over any trailing bytes on short reads */
+ xs_tcp_read_discard(transport, &desc);
+ } while (desc.count);
+ ret = len - desc.count;
+ if (ret < rd_desc->count)
+ rd_desc->count -= ret;
+ else
+ rd_desc->count = 0;
+ trace_xs_tcp_data_recv(transport);
+ dprintk("RPC: xs_tcp_data_recv done\n");
+ return ret;
+}
+
+static void xs_tcp_data_receive(struct sock_xprt *transport)
+{
+ struct rpc_xprt *xprt = &transport->xprt;
+ struct sock *sk;
+ read_descriptor_t rd_desc = {
+ .arg.data = xprt,
+ };
+ unsigned long total = 0;
+ int read = 0;
+
+restart:
+ mutex_lock(&transport->recv_mutex);
+ sk = transport->inet;
+ if (sk == NULL)
+ goto out;
+
+ /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
+ for (;;) {
+ rd_desc.count = RPC_TCP_READ_CHUNK_SZ;
+ lock_sock(sk);
+ read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
+ if (rd_desc.count != 0 || read < 0) {
+ clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
+ release_sock(sk);
+ break;
+ }
+ release_sock(sk);
+ total += read;
+ if (need_resched()) {
+ mutex_unlock(&transport->recv_mutex);
+ cond_resched();
+ goto restart;
+ }
+ }
+ if (test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
+ queue_work(xprtiod_workqueue, &transport->recv_worker);
+out:
+ mutex_unlock(&transport->recv_mutex);
+ trace_xs_tcp_data_ready(xprt, read, total);
+}
+
+static void xs_tcp_data_receive_workfn(struct work_struct *work)
+{
+ struct sock_xprt *transport =
+ container_of(work, struct sock_xprt, recv_worker);
+ xs_tcp_data_receive(transport);
+}
+
+/**
+ * xs_tcp_state_change - callback to handle TCP socket state changes
+ * @sk: socket whose state has changed
+ *
+ */
+static void xs_tcp_state_change(struct sock *sk)
+{
+ struct rpc_xprt *xprt;
+ struct sock_xprt *transport;
+
+ read_lock_bh(&sk->sk_callback_lock);
+ if (!(xprt = xprt_from_sock(sk)))
+ goto out;
+ dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
+ dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
+ sk->sk_state, xprt_connected(xprt),
+ sock_flag(sk, SOCK_DEAD),
+ sock_flag(sk, SOCK_ZAPPED),
+ sk->sk_shutdown);
+
+ transport = container_of(xprt, struct sock_xprt, xprt);
+ trace_rpc_socket_state_change(xprt, sk->sk_socket);
+ switch (sk->sk_state) {
+ case TCP_ESTABLISHED:
+ spin_lock(&xprt->transport_lock);
+ if (!xprt_test_and_set_connected(xprt)) {
+
+ /* Reset TCP record info */
+ transport->tcp_offset = 0;
+ transport->tcp_reclen = 0;
+ transport->tcp_copied = 0;
+ transport->tcp_flags =
+ TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
+ xprt->connect_cookie++;
+ clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
+ xprt_clear_connecting(xprt);
+
+ xprt_wake_pending_tasks(xprt, -EAGAIN);
+ }
+ spin_unlock(&xprt->transport_lock);
+ break;
+ case TCP_FIN_WAIT1:
+ /* The client initiated a shutdown of the socket */
+ xprt->connect_cookie++;
+ xprt->reestablish_timeout = 0;
+ set_bit(XPRT_CLOSING, &xprt->state);
+ smp_mb__before_atomic();
+ clear_bit(XPRT_CONNECTED, &xprt->state);
+ clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
+ smp_mb__after_atomic();
+ break;
+ case TCP_CLOSE_WAIT:
+ /* The server initiated a shutdown of the socket */
+ xprt->connect_cookie++;
+ clear_bit(XPRT_CONNECTED, &xprt->state);
+ xs_tcp_force_close(xprt);
+ /* fall through */
+ case TCP_CLOSING:
+ /*
+ * If the server closed down the connection, make sure that
+ * we back off before reconnecting
+ */
+ if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
+ xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+ break;
+ case TCP_LAST_ACK:
+ set_bit(XPRT_CLOSING, &xprt->state);
+ smp_mb__before_atomic();
+ clear_bit(XPRT_CONNECTED, &xprt->state);
+ smp_mb__after_atomic();
+ break;
+ case TCP_CLOSE:
+ if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
+ &transport->sock_state))
+ xprt_clear_connecting(xprt);
+ clear_bit(XPRT_CLOSING, &xprt->state);
+ if (sk->sk_err)
+ xprt_wake_pending_tasks(xprt, -sk->sk_err);
+ /* Trigger the socket release */
+ xs_tcp_force_close(xprt);
+ }
+ out:
+ read_unlock_bh(&sk->sk_callback_lock);
+}
+
+static void xs_write_space(struct sock *sk)
+{
+ struct socket_wq *wq;
+ struct rpc_xprt *xprt;
+
+ if (!sk->sk_socket)
+ return;
+ clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
+
+ if (unlikely(!(xprt = xprt_from_sock(sk))))
+ return;
+ rcu_read_lock();
+ wq = rcu_dereference(sk->sk_wq);
+ if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
+ goto out;
+
+ xprt_write_space(xprt);
+out:
+ rcu_read_unlock();
+}
+
+/**
+ * xs_udp_write_space - callback invoked when socket buffer space
+ * becomes available
+ * @sk: socket whose state has changed
+ *
+ * Called when more output buffer space is available for this socket.
+ * We try not to wake our writers until they can make "significant"
+ * progress, otherwise we'll waste resources thrashing kernel_sendmsg
+ * with a bunch of small requests.
+ */
+static void xs_udp_write_space(struct sock *sk)
+{
+ read_lock_bh(&sk->sk_callback_lock);
+
+ /* from net/core/sock.c:sock_def_write_space */
+ if (sock_writeable(sk))
+ xs_write_space(sk);
+
+ read_unlock_bh(&sk->sk_callback_lock);
+}
+
+/**
+ * xs_tcp_write_space - callback invoked when socket buffer space
+ * becomes available
+ * @sk: socket whose state has changed
+ *
+ * Called when more output buffer space is available for this socket.
+ * We try not to wake our writers until they can make "significant"
+ * progress, otherwise we'll waste resources thrashing kernel_sendmsg
+ * with a bunch of small requests.
+ */
+static void xs_tcp_write_space(struct sock *sk)
+{
+ read_lock_bh(&sk->sk_callback_lock);
+
+ /* from net/core/stream.c:sk_stream_write_space */
+ if (sk_stream_is_writeable(sk))
+ xs_write_space(sk);
+
+ read_unlock_bh(&sk->sk_callback_lock);
+}
+
+static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+ struct sock *sk = transport->inet;
+
+ if (transport->rcvsize) {
+ sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
+ sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
+ }
+ if (transport->sndsize) {
+ sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
+ sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
+ sk->sk_write_space(sk);
+ }
+}
+
+/**
+ * xs_udp_set_buffer_size - set send and receive limits
+ * @xprt: generic transport
+ * @sndsize: requested size of send buffer, in bytes
+ * @rcvsize: requested size of receive buffer, in bytes
+ *
+ * Set socket send and receive buffer size limits.
+ */
+static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+ transport->sndsize = 0;
+ if (sndsize)
+ transport->sndsize = sndsize + 1024;
+ transport->rcvsize = 0;
+ if (rcvsize)
+ transport->rcvsize = rcvsize + 1024;
+
+ xs_udp_do_set_buffer_size(xprt);
+}
+
+/**
+ * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
+ * @task: task that timed out
+ *
+ * Adjust the congestion window after a retransmit timeout has occurred.
+ */
+static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+ spin_lock_bh(&xprt->transport_lock);
+ xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
+ spin_unlock_bh(&xprt->transport_lock);
+}
+
+static unsigned short xs_get_random_port(void)
+{
+ unsigned short range = xprt_max_resvport - xprt_min_resvport + 1;
+ unsigned short rand = (unsigned short) prandom_u32() % range;
+ return rand + xprt_min_resvport;
+}
+
+/**
+ * xs_set_reuseaddr_port - set the socket's port and address reuse options
+ * @sock: socket
+ *
+ * Note that this function has to be called on all sockets that share the
+ * same port, and it must be called before binding.
+ */
+static void xs_sock_set_reuseport(struct socket *sock)
+{
+ int opt = 1;
+
+ kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
+ (char *)&opt, sizeof(opt));
+}
+
+static unsigned short xs_sock_getport(struct socket *sock)
+{
+ struct sockaddr_storage buf;
+ unsigned short port = 0;
+
+ if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
+ goto out;
+ switch (buf.ss_family) {
+ case AF_INET6:
+ port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
+ break;
+ case AF_INET:
+ port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
+ }
+out:
+ return port;
+}
+
+/**
+ * xs_set_port - reset the port number in the remote endpoint address
+ * @xprt: generic transport
+ * @port: new port number
+ *
+ */
+static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
+{
+ dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
+
+ rpc_set_port(xs_addr(xprt), port);
+ xs_update_peer_port(xprt);
+}
+
+static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
+{
+ if (transport->srcport == 0)
+ transport->srcport = xs_sock_getport(sock);
+}
+
+static unsigned short xs_get_srcport(struct sock_xprt *transport)
+{
+ unsigned short port = transport->srcport;
+
+ if (port == 0 && transport->xprt.resvport)
+ port = xs_get_random_port();
+ return port;
+}
+
+static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
+{
+ if (transport->srcport != 0)
+ transport->srcport = 0;
+ if (!transport->xprt.resvport)
+ return 0;
+ if (port <= xprt_min_resvport || port > xprt_max_resvport)
+ return xprt_max_resvport;
+ return --port;
+}
+static int xs_bind(struct sock_xprt *transport, struct socket *sock)
+{
+ struct sockaddr_storage myaddr;
+ int err, nloop = 0;
+ unsigned short port = xs_get_srcport(transport);
+ unsigned short last;
+
+ /*
+ * If we are asking for any ephemeral port (i.e. port == 0 &&
+ * transport->xprt.resvport == 0), don't bind. Let the local
+ * port selection happen implicitly when the socket is used
+ * (for example at connect time).
+ *
+ * This ensures that we can continue to establish TCP
+ * connections even when all local ephemeral ports are already
+ * a part of some TCP connection. This makes no difference
+ * for UDP sockets, but also doens't harm them.
+ *
+ * If we're asking for any reserved port (i.e. port == 0 &&
+ * transport->xprt.resvport == 1) xs_get_srcport above will
+ * ensure that port is non-zero and we will bind as needed.
+ */
+ if (port == 0)
+ return 0;
+
+ memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
+ do {
+ rpc_set_port((struct sockaddr *)&myaddr, port);
+ err = kernel_bind(sock, (struct sockaddr *)&myaddr,
+ transport->xprt.addrlen);
+ if (err == 0) {
+ transport->srcport = port;
+ break;
+ }
+ last = port;
+ port = xs_next_srcport(transport, port);
+ if (port > last)
+ nloop++;
+ } while (err == -EADDRINUSE && nloop != 2);
+
+ if (myaddr.ss_family == AF_INET)
+ dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
+ &((struct sockaddr_in *)&myaddr)->sin_addr,
+ port, err ? "failed" : "ok", err);
+ else
+ dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
+ &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
+ port, err ? "failed" : "ok", err);
+ return err;
+}
+
+/*
+ * We don't support autobind on AF_LOCAL sockets
+ */
+static void xs_local_rpcbind(struct rpc_task *task)
+{
+ xprt_set_bound(task->tk_xprt);
+}
+
+static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
+{
+}
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static struct lock_class_key xs_key[2];
+static struct lock_class_key xs_slock_key[2];
+
+static inline void xs_reclassify_socketu(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
+ &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
+}
+
+static inline void xs_reclassify_socket4(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
+ &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
+}
+
+static inline void xs_reclassify_socket6(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
+ &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
+}
+
+static inline void xs_reclassify_socket(int family, struct socket *sock)
+{
+ if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
+ return;
+
+ switch (family) {
+ case AF_LOCAL:
+ xs_reclassify_socketu(sock);
+ break;
+ case AF_INET:
+ xs_reclassify_socket4(sock);
+ break;
+ case AF_INET6:
+ xs_reclassify_socket6(sock);
+ break;
+ }
+}
+#else
+static inline void xs_reclassify_socket(int family, struct socket *sock)
+{
+}
+#endif
+
+static void xs_dummy_setup_socket(struct work_struct *work)
+{
+}
+
+static struct socket *xs_create_sock(struct rpc_xprt *xprt,
+ struct sock_xprt *transport, int family, int type,
+ int protocol, bool reuseport)
+{
+ struct socket *sock;
+ int err;
+
+ err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
+ if (err < 0) {
+ dprintk("RPC: can't create %d transport socket (%d).\n",
+ protocol, -err);
+ goto out;
+ }
+ xs_reclassify_socket(family, sock);
+
+ if (reuseport)
+ xs_sock_set_reuseport(sock);
+
+ err = xs_bind(transport, sock);
+ if (err) {
+ sock_release(sock);
+ goto out;
+ }
+
+ return sock;
+out:
+ return ERR_PTR(err);
+}
+
+static int xs_local_finish_connecting(struct rpc_xprt *xprt,
+ struct socket *sock)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
+ xprt);
+
+ if (!transport->inet) {
+ struct sock *sk = sock->sk;
+
+ write_lock_bh(&sk->sk_callback_lock);
+
+ xs_save_old_callbacks(transport, sk);
+
+ sk->sk_user_data = xprt;
+ sk->sk_data_ready = xs_data_ready;
+ sk->sk_write_space = xs_udp_write_space;
+ sock_set_flag(sk, SOCK_FASYNC);
+ sk->sk_error_report = xs_error_report;
+ sk->sk_allocation = GFP_NOIO;
+
+ xprt_clear_connected(xprt);
+
+ /* Reset to new socket */
+ transport->sock = sock;
+ transport->inet = sk;
+
+ write_unlock_bh(&sk->sk_callback_lock);
+ }
+
+ /* Tell the socket layer to start connecting... */
+ xprt->stat.connect_count++;
+ xprt->stat.connect_start = jiffies;
+ return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
+}
+
+/**
+ * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
+ * @transport: socket transport to connect
+ */
+static int xs_local_setup_socket(struct sock_xprt *transport)
+{
+ struct rpc_xprt *xprt = &transport->xprt;
+ struct socket *sock;
+ int status = -EIO;
+
+ status = __sock_create(xprt->xprt_net, AF_LOCAL,
+ SOCK_STREAM, 0, &sock, 1);
+ if (status < 0) {
+ dprintk("RPC: can't create AF_LOCAL "
+ "transport socket (%d).\n", -status);
+ goto out;
+ }
+ xs_reclassify_socket(AF_LOCAL, sock);
+
+ dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
+ xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
+
+ status = xs_local_finish_connecting(xprt, sock);
+ trace_rpc_socket_connect(xprt, sock, status);
+ switch (status) {
+ case 0:
+ dprintk("RPC: xprt %p connected to %s\n",
+ xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
+ xprt_set_connected(xprt);
+ case -ENOBUFS:
+ break;
+ case -ENOENT:
+ dprintk("RPC: xprt %p: socket %s does not exist\n",
+ xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
+ break;
+ case -ECONNREFUSED:
+ dprintk("RPC: xprt %p: connection refused for %s\n",
+ xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
+ break;
+ default:
+ printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
+ __func__, -status,
+ xprt->address_strings[RPC_DISPLAY_ADDR]);
+ }
+
+out:
+ xprt_clear_connecting(xprt);
+ xprt_wake_pending_tasks(xprt, status);
+ return status;
+}
+
+static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+ int ret;
+
+ if (RPC_IS_ASYNC(task)) {
+ /*
+ * We want the AF_LOCAL connect to be resolved in the
+ * filesystem namespace of the process making the rpc
+ * call. Thus we connect synchronously.
+ *
+ * If we want to support asynchronous AF_LOCAL calls,
+ * we'll need to figure out how to pass a namespace to
+ * connect.
+ */
+ rpc_exit(task, -ENOTCONN);
+ return;
+ }
+ ret = xs_local_setup_socket(transport);
+ if (ret && !RPC_IS_SOFTCONN(task))
+ msleep_interruptible(15000);
+}
+
+#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
+/*
+ * Note that this should be called with XPRT_LOCKED held (or when we otherwise
+ * know that we have exclusive access to the socket), to guard against
+ * races with xs_reset_transport.
+ */
+static void xs_set_memalloc(struct rpc_xprt *xprt)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
+ xprt);
+
+ /*
+ * If there's no sock, then we have nothing to set. The
+ * reconnecting process will get it for us.
+ */
+ if (!transport->inet)
+ return;
+ if (atomic_read(&xprt->swapper))
+ sk_set_memalloc(transport->inet);
+}
+
+/**
+ * xs_enable_swap - Tag this transport as being used for swap.
+ * @xprt: transport to tag
+ *
+ * Take a reference to this transport on behalf of the rpc_clnt, and
+ * optionally mark it for swapping if it wasn't already.
+ */
+static int
+xs_enable_swap(struct rpc_xprt *xprt)
+{
+ struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
+
+ if (atomic_inc_return(&xprt->swapper) != 1)
+ return 0;
+ if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
+ return -ERESTARTSYS;
+ if (xs->inet)
+ sk_set_memalloc(xs->inet);
+ xprt_release_xprt(xprt, NULL);
+ return 0;
+}
+
+/**
+ * xs_disable_swap - Untag this transport as being used for swap.
+ * @xprt: transport to tag
+ *
+ * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
+ * swapper refcount goes to 0, untag the socket as a memalloc socket.
+ */
+static void
+xs_disable_swap(struct rpc_xprt *xprt)
+{
+ struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
+
+ if (!atomic_dec_and_test(&xprt->swapper))
+ return;
+ if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
+ return;
+ if (xs->inet)
+ sk_clear_memalloc(xs->inet);
+ xprt_release_xprt(xprt, NULL);
+}
+#else
+static void xs_set_memalloc(struct rpc_xprt *xprt)
+{
+}
+
+static int
+xs_enable_swap(struct rpc_xprt *xprt)
+{
+ return -EINVAL;
+}
+
+static void
+xs_disable_swap(struct rpc_xprt *xprt)
+{
+}
+#endif
+
+static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+ if (!transport->inet) {
+ struct sock *sk = sock->sk;
+
+ write_lock_bh(&sk->sk_callback_lock);
+
+ xs_save_old_callbacks(transport, sk);
+
+ sk->sk_user_data = xprt;
+ sk->sk_data_ready = xs_data_ready;
+ sk->sk_write_space = xs_udp_write_space;
+ sock_set_flag(sk, SOCK_FASYNC);
+ sk->sk_allocation = GFP_NOIO;
+
+ xprt_set_connected(xprt);
+
+ /* Reset to new socket */
+ transport->sock = sock;
+ transport->inet = sk;
+
+ xs_set_memalloc(xprt);
+
+ write_unlock_bh(&sk->sk_callback_lock);
+ }
+ xs_udp_do_set_buffer_size(xprt);
+
+ xprt->stat.connect_start = jiffies;
+}
+
+static void xs_udp_setup_socket(struct work_struct *work)
+{
+ struct sock_xprt *transport =
+ container_of(work, struct sock_xprt, connect_worker.work);
+ struct rpc_xprt *xprt = &transport->xprt;
+ struct socket *sock;
+ int status = -EIO;
+
+ sock = xs_create_sock(xprt, transport,
+ xs_addr(xprt)->sa_family, SOCK_DGRAM,
+ IPPROTO_UDP, false);
+ if (IS_ERR(sock))
+ goto out;
+
+ dprintk("RPC: worker connecting xprt %p via %s to "
+ "%s (port %s)\n", xprt,
+ xprt->address_strings[RPC_DISPLAY_PROTO],
+ xprt->address_strings[RPC_DISPLAY_ADDR],
+ xprt->address_strings[RPC_DISPLAY_PORT]);
+
+ xs_udp_finish_connecting(xprt, sock);
+ trace_rpc_socket_connect(xprt, sock, 0);
+ status = 0;
+out:
+ xprt_unlock_connect(xprt, transport);
+ xprt_clear_connecting(xprt);
+ xprt_wake_pending_tasks(xprt, status);
+}
+
+/**
+ * xs_tcp_shutdown - gracefully shut down a TCP socket
+ * @xprt: transport
+ *
+ * Initiates a graceful shutdown of the TCP socket by calling the
+ * equivalent of shutdown(SHUT_RDWR);
+ */
+static void xs_tcp_shutdown(struct rpc_xprt *xprt)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+ struct socket *sock = transport->sock;
+ int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
+
+ if (sock == NULL)
+ return;
+ switch (skst) {
+ default:
+ kernel_sock_shutdown(sock, SHUT_RDWR);
+ trace_rpc_socket_shutdown(xprt, sock);
+ break;
+ case TCP_CLOSE:
+ case TCP_TIME_WAIT:
+ xs_reset_transport(transport);
+ }
+}
+
+static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
+ struct socket *sock)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+ unsigned int keepidle;
+ unsigned int keepcnt;
+ unsigned int opt_on = 1;
+ unsigned int timeo;
+
+ spin_lock_bh(&xprt->transport_lock);
+ keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
+ keepcnt = xprt->timeout->to_retries + 1;
+ timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
+ (xprt->timeout->to_retries + 1);
+ clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
+ spin_unlock_bh(&xprt->transport_lock);
+
+ /* TCP Keepalive options */
+ kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
+ (char *)&opt_on, sizeof(opt_on));
+ kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
+ (char *)&keepidle, sizeof(keepidle));
+ kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
+ (char *)&keepidle, sizeof(keepidle));
+ kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
+ (char *)&keepcnt, sizeof(keepcnt));
+
+ /* TCP user timeout (see RFC5482) */
+ kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
+ (char *)&timeo, sizeof(timeo));
+}
+
+static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
+ unsigned long connect_timeout,
+ unsigned long reconnect_timeout)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+ struct rpc_timeout to;
+ unsigned long initval;
+
+ spin_lock_bh(&xprt->transport_lock);
+ if (reconnect_timeout < xprt->max_reconnect_timeout)
+ xprt->max_reconnect_timeout = reconnect_timeout;
+ if (connect_timeout < xprt->connect_timeout) {
+ memcpy(&to, xprt->timeout, sizeof(to));
+ initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
+ /* Arbitrary lower limit */
+ if (initval < XS_TCP_INIT_REEST_TO << 1)
+ initval = XS_TCP_INIT_REEST_TO << 1;
+ to.to_initval = initval;
+ to.to_maxval = initval;
+ memcpy(&transport->tcp_timeout, &to,
+ sizeof(transport->tcp_timeout));
+ xprt->timeout = &transport->tcp_timeout;
+ xprt->connect_timeout = connect_timeout;
+ }
+ set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
+ spin_unlock_bh(&xprt->transport_lock);
+}
+
+static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+ int ret = -ENOTCONN;
+
+ if (!transport->inet) {
+ struct sock *sk = sock->sk;
+ unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC;
+
+ /* Avoid temporary address, they are bad for long-lived
+ * connections such as NFS mounts.
+ * RFC4941, section 3.6 suggests that:
+ * Individual applications, which have specific
+ * knowledge about the normal duration of connections,
+ * MAY override this as appropriate.
+ */
+ kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES,
+ (char *)&addr_pref, sizeof(addr_pref));
+
+ xs_tcp_set_socket_timeouts(xprt, sock);
+
+ write_lock_bh(&sk->sk_callback_lock);
+
+ xs_save_old_callbacks(transport, sk);
+
+ sk->sk_user_data = xprt;
+ sk->sk_data_ready = xs_data_ready;
+ sk->sk_state_change = xs_tcp_state_change;
+ sk->sk_write_space = xs_tcp_write_space;
+ sock_set_flag(sk, SOCK_FASYNC);
+ sk->sk_error_report = xs_error_report;
+ sk->sk_allocation = GFP_NOIO;
+
+ /* socket options */
+ sock_reset_flag(sk, SOCK_LINGER);
+ tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
+
+ xprt_clear_connected(xprt);
+
+ /* Reset to new socket */
+ transport->sock = sock;
+ transport->inet = sk;
+
+ write_unlock_bh(&sk->sk_callback_lock);
+ }
+
+ if (!xprt_bound(xprt))
+ goto out;
+
+ xs_set_memalloc(xprt);
+
+ /* Tell the socket layer to start connecting... */
+ xprt->stat.connect_count++;
+ xprt->stat.connect_start = jiffies;
+ set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
+ ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
+ switch (ret) {
+ case 0:
+ xs_set_srcport(transport, sock);
+ /* fall through */
+ case -EINPROGRESS:
+ /* SYN_SENT! */
+ if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
+ xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+ break;
+ case -EADDRNOTAVAIL:
+ /* Source port number is unavailable. Try a new one! */
+ transport->srcport = 0;
+ }
+out:
+ return ret;
+}
+
+/**
+ * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
+ *
+ * Invoked by a work queue tasklet.
+ */
+static void xs_tcp_setup_socket(struct work_struct *work)
+{
+ struct sock_xprt *transport =
+ container_of(work, struct sock_xprt, connect_worker.work);
+ struct socket *sock = transport->sock;
+ struct rpc_xprt *xprt = &transport->xprt;
+ int status = -EIO;
+
+ if (!sock) {
+ sock = xs_create_sock(xprt, transport,
+ xs_addr(xprt)->sa_family, SOCK_STREAM,
+ IPPROTO_TCP, true);
+ if (IS_ERR(sock)) {
+ status = PTR_ERR(sock);
+ goto out;
+ }
+ }
+
+ dprintk("RPC: worker connecting xprt %p via %s to "
+ "%s (port %s)\n", xprt,
+ xprt->address_strings[RPC_DISPLAY_PROTO],
+ xprt->address_strings[RPC_DISPLAY_ADDR],
+ xprt->address_strings[RPC_DISPLAY_PORT]);
+
+ status = xs_tcp_finish_connecting(xprt, sock);
+ trace_rpc_socket_connect(xprt, sock, status);
+ dprintk("RPC: %p connect status %d connected %d sock state %d\n",
+ xprt, -status, xprt_connected(xprt),
+ sock->sk->sk_state);
+ switch (status) {
+ default:
+ printk("%s: connect returned unhandled error %d\n",
+ __func__, status);
+ /* fall through */
+ case -EADDRNOTAVAIL:
+ /* We're probably in TIME_WAIT. Get rid of existing socket,
+ * and retry
+ */
+ xs_tcp_force_close(xprt);
+ break;
+ case 0:
+ case -EINPROGRESS:
+ case -EALREADY:
+ xprt_unlock_connect(xprt, transport);
+ return;
+ case -EINVAL:
+ /* Happens, for instance, if the user specified a link
+ * local IPv6 address without a scope-id.
+ */
+ case -ECONNREFUSED:
+ case -ECONNRESET:
+ case -ENETDOWN:
+ case -ENETUNREACH:
+ case -EHOSTUNREACH:
+ case -EADDRINUSE:
+ case -ENOBUFS:
+ /*
+ * xs_tcp_force_close() wakes tasks with -EIO.
+ * We need to wake them first to ensure the
+ * correct error code.
+ */
+ xprt_wake_pending_tasks(xprt, status);
+ xs_tcp_force_close(xprt);
+ goto out;
+ }
+ status = -EAGAIN;
+out:
+ xprt_unlock_connect(xprt, transport);
+ xprt_clear_connecting(xprt);
+ xprt_wake_pending_tasks(xprt, status);
+}
+
+static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt)
+{
+ unsigned long start, now = jiffies;
+
+ start = xprt->stat.connect_start + xprt->reestablish_timeout;
+ if (time_after(start, now))
+ return start - now;
+ return 0;
+}
+
+static void xs_reconnect_backoff(struct rpc_xprt *xprt)
+{
+ xprt->reestablish_timeout <<= 1;
+ if (xprt->reestablish_timeout > xprt->max_reconnect_timeout)
+ xprt->reestablish_timeout = xprt->max_reconnect_timeout;
+ if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
+ xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+}
+
+/**
+ * xs_connect - connect a socket to a remote endpoint
+ * @xprt: pointer to transport structure
+ * @task: address of RPC task that manages state of connect request
+ *
+ * TCP: If the remote end dropped the connection, delay reconnecting.
+ *
+ * UDP socket connects are synchronous, but we use a work queue anyway
+ * to guarantee that even unprivileged user processes can set up a
+ * socket on a privileged port.
+ *
+ * If a UDP socket connect fails, the delay behavior here prevents
+ * retry floods (hard mounts).
+ */
+static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+ unsigned long delay = 0;
+
+ WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
+
+ if (transport->sock != NULL) {
+ dprintk("RPC: xs_connect delayed xprt %p for %lu "
+ "seconds\n",
+ xprt, xprt->reestablish_timeout / HZ);
+
+ /* Start by resetting any existing state */
+ xs_reset_transport(transport);
+
+ delay = xs_reconnect_delay(xprt);
+ xs_reconnect_backoff(xprt);
+
+ } else
+ dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
+
+ queue_delayed_work(xprtiod_workqueue,
+ &transport->connect_worker,
+ delay);
+}
+
+/**
+ * xs_local_print_stats - display AF_LOCAL socket-specifc stats
+ * @xprt: rpc_xprt struct containing statistics
+ * @seq: output file
+ *
+ */
+static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
+{
+ long idle_time = 0;
+
+ if (xprt_connected(xprt))
+ idle_time = (long)(jiffies - xprt->last_used) / HZ;
+
+ seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
+ "%llu %llu %lu %llu %llu\n",
+ xprt->stat.bind_count,
+ xprt->stat.connect_count,
+ xprt->stat.connect_time,
+ idle_time,
+ xprt->stat.sends,
+ xprt->stat.recvs,
+ xprt->stat.bad_xids,
+ xprt->stat.req_u,
+ xprt->stat.bklog_u,
+ xprt->stat.max_slots,
+ xprt->stat.sending_u,
+ xprt->stat.pending_u);
+}
+
+/**
+ * xs_udp_print_stats - display UDP socket-specifc stats
+ * @xprt: rpc_xprt struct containing statistics
+ * @seq: output file
+ *
+ */
+static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+ seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
+ "%lu %llu %llu\n",
+ transport->srcport,
+ xprt->stat.bind_count,
+ xprt->stat.sends,
+ xprt->stat.recvs,
+ xprt->stat.bad_xids,
+ xprt->stat.req_u,
+ xprt->stat.bklog_u,
+ xprt->stat.max_slots,
+ xprt->stat.sending_u,
+ xprt->stat.pending_u);
+}
+
+/**
+ * xs_tcp_print_stats - display TCP socket-specifc stats
+ * @xprt: rpc_xprt struct containing statistics
+ * @seq: output file
+ *
+ */
+static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
+{
+ struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+ long idle_time = 0;
+
+ if (xprt_connected(xprt))
+ idle_time = (long)(jiffies - xprt->last_used) / HZ;
+
+ seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
+ "%llu %llu %lu %llu %llu\n",
+ transport->srcport,
+ xprt->stat.bind_count,
+ xprt->stat.connect_count,
+ xprt->stat.connect_time,
+ idle_time,
+ xprt->stat.sends,
+ xprt->stat.recvs,
+ xprt->stat.bad_xids,
+ xprt->stat.req_u,
+ xprt->stat.bklog_u,
+ xprt->stat.max_slots,
+ xprt->stat.sending_u,
+ xprt->stat.pending_u);
+}
+
+/*
+ * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
+ * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
+ * to use the server side send routines.
+ */
+static int bc_malloc(struct rpc_task *task)
+{
+ struct rpc_rqst *rqst = task->tk_rqstp;
+ size_t size = rqst->rq_callsize;
+ struct page *page;
+ struct rpc_buffer *buf;
+
+ if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
+ WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
+ size);
+ return -EINVAL;
+ }
+
+ page = alloc_page(GFP_KERNEL);
+ if (!page)
+ return -ENOMEM;
+
+ buf = page_address(page);
+ buf->len = PAGE_SIZE;
+
+ rqst->rq_buffer = buf->data;
+ rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
+ return 0;
+}
+
+/*
+ * Free the space allocated in the bc_alloc routine
+ */
+static void bc_free(struct rpc_task *task)
+{
+ void *buffer = task->tk_rqstp->rq_buffer;
+ struct rpc_buffer *buf;
+
+ buf = container_of(buffer, struct rpc_buffer, data);
+ free_page((unsigned long)buf);
+}
+
+/*
+ * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
+ * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
+ */
+static int bc_sendto(struct rpc_rqst *req)
+{
+ int len;
+ struct xdr_buf *xbufp = &req->rq_snd_buf;
+ struct rpc_xprt *xprt = req->rq_xprt;
+ struct sock_xprt *transport =
+ container_of(xprt, struct sock_xprt, xprt);
+ struct socket *sock = transport->sock;
+ unsigned long headoff;
+ unsigned long tailoff;
+
+ xs_encode_stream_record_marker(xbufp);
+
+ tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
+ headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
+ len = svc_send_common(sock, xbufp,
+ virt_to_page(xbufp->head[0].iov_base), headoff,
+ xbufp->tail[0].iov_base, tailoff);
+
+ if (len != xbufp->len) {
+ printk(KERN_NOTICE "Error sending entire callback!\n");
+ len = -EAGAIN;
+ }
+
+ return len;
+}
+
+/*
+ * The send routine. Borrows from svc_send
+ */
+static int bc_send_request(struct rpc_task *task)
+{
+ struct rpc_rqst *req = task->tk_rqstp;
+ struct svc_xprt *xprt;
+ int len;
+
+ dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
+ /*
+ * Get the server socket associated with this callback xprt
+ */
+ xprt = req->rq_xprt->bc_xprt;
+
+ /*
+ * Grab the mutex to serialize data as the connection is shared
+ * with the fore channel
+ */
+ if (!mutex_trylock(&xprt->xpt_mutex)) {
+ rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
+ if (!mutex_trylock(&xprt->xpt_mutex))
+ return -EAGAIN;
+ rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
+ }
+ if (test_bit(XPT_DEAD, &xprt->xpt_flags))
+ len = -ENOTCONN;
+ else
+ len = bc_sendto(req);
+ mutex_unlock(&xprt->xpt_mutex);
+
+ if (len > 0)
+ len = 0;
+
+ return len;
+}
+
+/*
+ * The close routine. Since this is client initiated, we do nothing
+ */
+
+static void bc_close(struct rpc_xprt *xprt)
+{
+}
+
+/*
+ * The xprt destroy routine. Again, because this connection is client
+ * initiated, we do nothing
+ */
+
+static void bc_destroy(struct rpc_xprt *xprt)
+{
+ dprintk("RPC: bc_destroy xprt %p\n", xprt);
+
+ xs_xprt_free(xprt);
+ module_put(THIS_MODULE);
+}
+
+static const struct rpc_xprt_ops xs_local_ops = {
+ .reserve_xprt = xprt_reserve_xprt,
+ .release_xprt = xs_tcp_release_xprt,
+ .alloc_slot = xprt_alloc_slot,
+ .free_slot = xprt_free_slot,
+ .rpcbind = xs_local_rpcbind,
+ .set_port = xs_local_set_port,
+ .connect = xs_local_connect,
+ .buf_alloc = rpc_malloc,
+ .buf_free = rpc_free,
+ .send_request = xs_local_send_request,
+ .set_retrans_timeout = xprt_set_retrans_timeout_def,
+ .close = xs_close,
+ .destroy = xs_destroy,
+ .print_stats = xs_local_print_stats,
+ .enable_swap = xs_enable_swap,
+ .disable_swap = xs_disable_swap,
+};
+
+static const struct rpc_xprt_ops xs_udp_ops = {
+ .set_buffer_size = xs_udp_set_buffer_size,
+ .reserve_xprt = xprt_reserve_xprt_cong,
+ .release_xprt = xprt_release_xprt_cong,
+ .alloc_slot = xprt_alloc_slot,
+ .free_slot = xprt_free_slot,
+ .rpcbind = rpcb_getport_async,
+ .set_port = xs_set_port,
+ .connect = xs_connect,
+ .buf_alloc = rpc_malloc,
+ .buf_free = rpc_free,
+ .send_request = xs_udp_send_request,
+ .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
+ .timer = xs_udp_timer,
+ .release_request = xprt_release_rqst_cong,
+ .close = xs_close,
+ .destroy = xs_destroy,
+ .print_stats = xs_udp_print_stats,
+ .enable_swap = xs_enable_swap,
+ .disable_swap = xs_disable_swap,
+ .inject_disconnect = xs_inject_disconnect,
+};
+
+static const struct rpc_xprt_ops xs_tcp_ops = {
+ .reserve_xprt = xprt_reserve_xprt,
+ .release_xprt = xs_tcp_release_xprt,
+ .alloc_slot = xprt_lock_and_alloc_slot,
+ .free_slot = xprt_free_slot,
+ .rpcbind = rpcb_getport_async,
+ .set_port = xs_set_port,
+ .connect = xs_connect,
+ .buf_alloc = rpc_malloc,
+ .buf_free = rpc_free,
+ .send_request = xs_tcp_send_request,
+ .set_retrans_timeout = xprt_set_retrans_timeout_def,
+ .close = xs_tcp_shutdown,
+ .destroy = xs_destroy,
+ .set_connect_timeout = xs_tcp_set_connect_timeout,
+ .print_stats = xs_tcp_print_stats,
+ .enable_swap = xs_enable_swap,
+ .disable_swap = xs_disable_swap,
+ .inject_disconnect = xs_inject_disconnect,
+#ifdef CONFIG_SUNRPC_BACKCHANNEL
+ .bc_setup = xprt_setup_bc,
+ .bc_up = xs_tcp_bc_up,
+ .bc_maxpayload = xs_tcp_bc_maxpayload,
+ .bc_free_rqst = xprt_free_bc_rqst,
+ .bc_destroy = xprt_destroy_bc,
+#endif
+};
+
+/*
+ * The rpc_xprt_ops for the server backchannel
+ */
+
+static const struct rpc_xprt_ops bc_tcp_ops = {
+ .reserve_xprt = xprt_reserve_xprt,
+ .release_xprt = xprt_release_xprt,
+ .alloc_slot = xprt_alloc_slot,
+ .free_slot = xprt_free_slot,
+ .buf_alloc = bc_malloc,
+ .buf_free = bc_free,
+ .send_request = bc_send_request,
+ .set_retrans_timeout = xprt_set_retrans_timeout_def,
+ .close = bc_close,
+ .destroy = bc_destroy,
+ .print_stats = xs_tcp_print_stats,
+ .enable_swap = xs_enable_swap,
+ .disable_swap = xs_disable_swap,
+ .inject_disconnect = xs_inject_disconnect,
+};
+
+static int xs_init_anyaddr(const int family, struct sockaddr *sap)
+{
+ static const struct sockaddr_in sin = {
+ .sin_family = AF_INET,
+ .sin_addr.s_addr = htonl(INADDR_ANY),
+ };
+ static const struct sockaddr_in6 sin6 = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = IN6ADDR_ANY_INIT,
+ };
+
+ switch (family) {
+ case AF_LOCAL:
+ break;
+ case AF_INET:
+ memcpy(sap, &sin, sizeof(sin));
+ break;
+ case AF_INET6:
+ memcpy(sap, &sin6, sizeof(sin6));
+ break;
+ default:
+ dprintk("RPC: %s: Bad address family\n", __func__);
+ return -EAFNOSUPPORT;
+ }
+ return 0;
+}
+
+static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
+ unsigned int slot_table_size,
+ unsigned int max_slot_table_size)
+{
+ struct rpc_xprt *xprt;
+ struct sock_xprt *new;
+
+ if (args->addrlen > sizeof(xprt->addr)) {
+ dprintk("RPC: xs_setup_xprt: address too large\n");
+ return ERR_PTR(-EBADF);
+ }
+
+ xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
+ max_slot_table_size);
+ if (xprt == NULL) {
+ dprintk("RPC: xs_setup_xprt: couldn't allocate "
+ "rpc_xprt\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ new = container_of(xprt, struct sock_xprt, xprt);
+ mutex_init(&new->recv_mutex);
+ memcpy(&xprt->addr, args->dstaddr, args->addrlen);
+ xprt->addrlen = args->addrlen;
+ if (args->srcaddr)
+ memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
+ else {
+ int err;
+ err = xs_init_anyaddr(args->dstaddr->sa_family,
+ (struct sockaddr *)&new->srcaddr);
+ if (err != 0) {
+ xprt_free(xprt);
+ return ERR_PTR(err);
+ }
+ }
+
+ return xprt;
+}
+
+static const struct rpc_timeout xs_local_default_timeout = {
+ .to_initval = 10 * HZ,
+ .to_maxval = 10 * HZ,
+ .to_retries = 2,
+};
+
+/**
+ * xs_setup_local - Set up transport to use an AF_LOCAL socket
+ * @args: rpc transport creation arguments
+ *
+ * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
+ */
+static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
+{
+ struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
+ struct sock_xprt *transport;
+ struct rpc_xprt *xprt;
+ struct rpc_xprt *ret;
+
+ xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
+ xprt_max_tcp_slot_table_entries);
+ if (IS_ERR(xprt))
+ return xprt;
+ transport = container_of(xprt, struct sock_xprt, xprt);
+
+ xprt->prot = 0;
+ xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
+ xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
+
+ xprt->bind_timeout = XS_BIND_TO;
+ xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+ xprt->idle_timeout = XS_IDLE_DISC_TO;
+
+ xprt->ops = &xs_local_ops;
+ xprt->timeout = &xs_local_default_timeout;
+
+ INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn);
+ INIT_DELAYED_WORK(&transport->connect_worker,
+ xs_dummy_setup_socket);
+
+ switch (sun->sun_family) {
+ case AF_LOCAL:
+ if (sun->sun_path[0] != '/') {
+ dprintk("RPC: bad AF_LOCAL address: %s\n",
+ sun->sun_path);
+ ret = ERR_PTR(-EINVAL);
+ goto out_err;
+ }
+ xprt_set_bound(xprt);
+ xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
+ ret = ERR_PTR(xs_local_setup_socket(transport));
+ if (ret)
+ goto out_err;
+ break;
+ default:
+ ret = ERR_PTR(-EAFNOSUPPORT);
+ goto out_err;
+ }
+
+ dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
+ xprt->address_strings[RPC_DISPLAY_ADDR]);
+
+ if (try_module_get(THIS_MODULE))
+ return xprt;
+ ret = ERR_PTR(-EINVAL);
+out_err:
+ xs_xprt_free(xprt);
+ return ret;
+}
+
+static const struct rpc_timeout xs_udp_default_timeout = {
+ .to_initval = 5 * HZ,
+ .to_maxval = 30 * HZ,
+ .to_increment = 5 * HZ,
+ .to_retries = 5,
+};
+
+/**
+ * xs_setup_udp - Set up transport to use a UDP socket
+ * @args: rpc transport creation arguments
+ *
+ */
+static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
+{
+ struct sockaddr *addr = args->dstaddr;
+ struct rpc_xprt *xprt;
+ struct sock_xprt *transport;
+ struct rpc_xprt *ret;
+
+ xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
+ xprt_udp_slot_table_entries);
+ if (IS_ERR(xprt))
+ return xprt;
+ transport = container_of(xprt, struct sock_xprt, xprt);
+
+ xprt->prot = IPPROTO_UDP;
+ xprt->tsh_size = 0;
+ /* XXX: header size can vary due to auth type, IPv6, etc. */
+ xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
+
+ xprt->bind_timeout = XS_BIND_TO;
+ xprt->reestablish_timeout = XS_UDP_REEST_TO;
+ xprt->idle_timeout = XS_IDLE_DISC_TO;
+
+ xprt->ops = &xs_udp_ops;
+
+ xprt->timeout = &xs_udp_default_timeout;
+
+ INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
+ INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
+
+ switch (addr->sa_family) {
+ case AF_INET:
+ if (((struct sockaddr_in *)addr)->sin_port != htons(0))
+ xprt_set_bound(xprt);
+
+ xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
+ break;
+ case AF_INET6:
+ if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
+ xprt_set_bound(xprt);
+
+ xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
+ break;
+ default:
+ ret = ERR_PTR(-EAFNOSUPPORT);
+ goto out_err;
+ }
+
+ if (xprt_bound(xprt))
+ dprintk("RPC: set up xprt to %s (port %s) via %s\n",
+ xprt->address_strings[RPC_DISPLAY_ADDR],
+ xprt->address_strings[RPC_DISPLAY_PORT],
+ xprt->address_strings[RPC_DISPLAY_PROTO]);
+ else
+ dprintk("RPC: set up xprt to %s (autobind) via %s\n",
+ xprt->address_strings[RPC_DISPLAY_ADDR],
+ xprt->address_strings[RPC_DISPLAY_PROTO]);
+
+ if (try_module_get(THIS_MODULE))
+ return xprt;
+ ret = ERR_PTR(-EINVAL);
+out_err:
+ xs_xprt_free(xprt);
+ return ret;
+}
+
+static const struct rpc_timeout xs_tcp_default_timeout = {
+ .to_initval = 60 * HZ,
+ .to_maxval = 60 * HZ,
+ .to_retries = 2,
+};
+
+/**
+ * xs_setup_tcp - Set up transport to use a TCP socket
+ * @args: rpc transport creation arguments
+ *
+ */
+static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
+{
+ struct sockaddr *addr = args->dstaddr;
+ struct rpc_xprt *xprt;
+ struct sock_xprt *transport;
+ struct rpc_xprt *ret;
+ unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
+
+ if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
+ max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
+
+ xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
+ max_slot_table_size);
+ if (IS_ERR(xprt))
+ return xprt;
+ transport = container_of(xprt, struct sock_xprt, xprt);
+
+ xprt->prot = IPPROTO_TCP;
+ xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
+ xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
+
+ xprt->bind_timeout = XS_BIND_TO;
+ xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+ xprt->idle_timeout = XS_IDLE_DISC_TO;
+
+ xprt->ops = &xs_tcp_ops;
+ xprt->timeout = &xs_tcp_default_timeout;
+
+ xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
+ xprt->connect_timeout = xprt->timeout->to_initval *
+ (xprt->timeout->to_retries + 1);
+
+ INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn);
+ INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
+
+ switch (addr->sa_family) {
+ case AF_INET:
+ if (((struct sockaddr_in *)addr)->sin_port != htons(0))
+ xprt_set_bound(xprt);
+
+ xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
+ break;
+ case AF_INET6:
+ if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
+ xprt_set_bound(xprt);
+
+ xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
+ break;
+ default:
+ ret = ERR_PTR(-EAFNOSUPPORT);
+ goto out_err;
+ }
+
+ if (xprt_bound(xprt))
+ dprintk("RPC: set up xprt to %s (port %s) via %s\n",
+ xprt->address_strings[RPC_DISPLAY_ADDR],
+ xprt->address_strings[RPC_DISPLAY_PORT],
+ xprt->address_strings[RPC_DISPLAY_PROTO]);
+ else
+ dprintk("RPC: set up xprt to %s (autobind) via %s\n",
+ xprt->address_strings[RPC_DISPLAY_ADDR],
+ xprt->address_strings[RPC_DISPLAY_PROTO]);
+
+ if (try_module_get(THIS_MODULE))
+ return xprt;
+ ret = ERR_PTR(-EINVAL);
+out_err:
+ xs_xprt_free(xprt);
+ return ret;
+}
+
+/**
+ * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
+ * @args: rpc transport creation arguments
+ *
+ */
+static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
+{
+ struct sockaddr *addr = args->dstaddr;
+ struct rpc_xprt *xprt;
+ struct sock_xprt *transport;
+ struct svc_sock *bc_sock;
+ struct rpc_xprt *ret;
+
+ xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
+ xprt_tcp_slot_table_entries);
+ if (IS_ERR(xprt))
+ return xprt;
+ transport = container_of(xprt, struct sock_xprt, xprt);
+
+ xprt->prot = IPPROTO_TCP;
+ xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
+ xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
+ xprt->timeout = &xs_tcp_default_timeout;
+
+ /* backchannel */
+ xprt_set_bound(xprt);
+ xprt->bind_timeout = 0;
+ xprt->reestablish_timeout = 0;
+ xprt->idle_timeout = 0;
+
+ xprt->ops = &bc_tcp_ops;
+
+ switch (addr->sa_family) {
+ case AF_INET:
+ xs_format_peer_addresses(xprt, "tcp",
+ RPCBIND_NETID_TCP);
+ break;
+ case AF_INET6:
+ xs_format_peer_addresses(xprt, "tcp",
+ RPCBIND_NETID_TCP6);
+ break;
+ default:
+ ret = ERR_PTR(-EAFNOSUPPORT);
+ goto out_err;
+ }
+
+ dprintk("RPC: set up xprt to %s (port %s) via %s\n",
+ xprt->address_strings[RPC_DISPLAY_ADDR],
+ xprt->address_strings[RPC_DISPLAY_PORT],
+ xprt->address_strings[RPC_DISPLAY_PROTO]);
+
+ /*
+ * Once we've associated a backchannel xprt with a connection,
+ * we want to keep it around as long as the connection lasts,
+ * in case we need to start using it for a backchannel again;
+ * this reference won't be dropped until bc_xprt is destroyed.
+ */
+ xprt_get(xprt);
+ args->bc_xprt->xpt_bc_xprt = xprt;
+ xprt->bc_xprt = args->bc_xprt;
+ bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
+ transport->sock = bc_sock->sk_sock;
+ transport->inet = bc_sock->sk_sk;
+
+ /*
+ * Since we don't want connections for the backchannel, we set
+ * the xprt status to connected
+ */
+ xprt_set_connected(xprt);
+
+ if (try_module_get(THIS_MODULE))
+ return xprt;
+
+ args->bc_xprt->xpt_bc_xprt = NULL;
+ args->bc_xprt->xpt_bc_xps = NULL;
+ xprt_put(xprt);
+ ret = ERR_PTR(-EINVAL);
+out_err:
+ xs_xprt_free(xprt);
+ return ret;
+}
+
+static struct xprt_class xs_local_transport = {
+ .list = LIST_HEAD_INIT(xs_local_transport.list),
+ .name = "named UNIX socket",
+ .owner = THIS_MODULE,
+ .ident = XPRT_TRANSPORT_LOCAL,
+ .setup = xs_setup_local,
+};
+
+static struct xprt_class xs_udp_transport = {
+ .list = LIST_HEAD_INIT(xs_udp_transport.list),
+ .name = "udp",
+ .owner = THIS_MODULE,
+ .ident = XPRT_TRANSPORT_UDP,
+ .setup = xs_setup_udp,
+};
+
+static struct xprt_class xs_tcp_transport = {
+ .list = LIST_HEAD_INIT(xs_tcp_transport.list),
+ .name = "tcp",
+ .owner = THIS_MODULE,
+ .ident = XPRT_TRANSPORT_TCP,
+ .setup = xs_setup_tcp,
+};
+
+static struct xprt_class xs_bc_tcp_transport = {
+ .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
+ .name = "tcp NFSv4.1 backchannel",
+ .owner = THIS_MODULE,
+ .ident = XPRT_TRANSPORT_BC_TCP,
+ .setup = xs_setup_bc_tcp,
+};
+
+/**
+ * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
+ *
+ */
+int init_socket_xprt(void)
+{
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+ if (!sunrpc_table_header)
+ sunrpc_table_header = register_sysctl_table(sunrpc_table);
+#endif
+
+ xprt_register_transport(&xs_local_transport);
+ xprt_register_transport(&xs_udp_transport);
+ xprt_register_transport(&xs_tcp_transport);
+ xprt_register_transport(&xs_bc_tcp_transport);
+
+ return 0;
+}
+
+/**
+ * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
+ *
+ */
+void cleanup_socket_xprt(void)
+{
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+ if (sunrpc_table_header) {
+ unregister_sysctl_table(sunrpc_table_header);
+ sunrpc_table_header = NULL;
+ }
+#endif
+
+ xprt_unregister_transport(&xs_local_transport);
+ xprt_unregister_transport(&xs_udp_transport);
+ xprt_unregister_transport(&xs_tcp_transport);
+ xprt_unregister_transport(&xs_bc_tcp_transport);
+}
+
+static int param_set_uint_minmax(const char *val,
+ const struct kernel_param *kp,
+ unsigned int min, unsigned int max)
+{
+ unsigned int num;
+ int ret;
+
+ if (!val)
+ return -EINVAL;
+ ret = kstrtouint(val, 0, &num);
+ if (ret)
+ return ret;
+ if (num < min || num > max)
+ return -EINVAL;
+ *((unsigned int *)kp->arg) = num;
+ return 0;
+}
+
+static int param_set_portnr(const char *val, const struct kernel_param *kp)
+{
+ if (kp->arg == &xprt_min_resvport)
+ return param_set_uint_minmax(val, kp,
+ RPC_MIN_RESVPORT,
+ xprt_max_resvport);
+ return param_set_uint_minmax(val, kp,
+ xprt_min_resvport,
+ RPC_MAX_RESVPORT);
+}
+
+static const struct kernel_param_ops param_ops_portnr = {
+ .set = param_set_portnr,
+ .get = param_get_uint,
+};
+
+#define param_check_portnr(name, p) \
+ __param_check(name, p, unsigned int);
+
+module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
+module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
+
+static int param_set_slot_table_size(const char *val,
+ const struct kernel_param *kp)
+{
+ return param_set_uint_minmax(val, kp,
+ RPC_MIN_SLOT_TABLE,
+ RPC_MAX_SLOT_TABLE);
+}
+
+static const struct kernel_param_ops param_ops_slot_table_size = {
+ .set = param_set_slot_table_size,
+ .get = param_get_uint,
+};
+
+#define param_check_slot_table_size(name, p) \
+ __param_check(name, p, unsigned int);
+
+static int param_set_max_slot_table_size(const char *val,
+ const struct kernel_param *kp)
+{
+ return param_set_uint_minmax(val, kp,
+ RPC_MIN_SLOT_TABLE,
+ RPC_MAX_SLOT_TABLE_LIMIT);
+}
+
+static const struct kernel_param_ops param_ops_max_slot_table_size = {
+ .set = param_set_max_slot_table_size,
+ .get = param_get_uint,
+};
+
+#define param_check_max_slot_table_size(name, p) \
+ __param_check(name, p, unsigned int);
+
+module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
+ slot_table_size, 0644);
+module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
+ max_slot_table_size, 0644);
+module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
+ slot_table_size, 0644);