v4.19.13 snapshot.
diff --git a/net/802/Kconfig b/net/802/Kconfig
new file mode 100644
index 0000000..80d4bf7
--- /dev/null
+++ b/net/802/Kconfig
@@ -0,0 +1,10 @@
+config STP
+ tristate
+ select LLC
+
+config GARP
+ tristate
+ select STP
+
+config MRP
+ tristate
diff --git a/net/802/Makefile b/net/802/Makefile
new file mode 100644
index 0000000..19406a8
--- /dev/null
+++ b/net/802/Makefile
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Linux 802.x protocol layers.
+#
+
+# Check the p8022 selections against net/core/Makefile.
+obj-$(CONFIG_LLC) += p8022.o psnap.o
+obj-$(CONFIG_NET_FC) += fc.o
+obj-$(CONFIG_FDDI) += fddi.o
+obj-$(CONFIG_HIPPI) += hippi.o
+obj-$(CONFIG_IPX) += p8022.o psnap.o p8023.o
+obj-$(CONFIG_ATALK) += p8022.o psnap.o
+obj-$(CONFIG_STP) += stp.o
+obj-$(CONFIG_GARP) += garp.o
+obj-$(CONFIG_MRP) += mrp.o
diff --git a/net/802/fc.c b/net/802/fc.c
new file mode 100644
index 0000000..058a9f7
--- /dev/null
+++ b/net/802/fc.c
@@ -0,0 +1,110 @@
+/*
+ * NET3: Fibre Channel device handling subroutines
+ *
+ * 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.
+ *
+ * Vineet Abraham <vma@iol.unh.edu>
+ * v 1.0 03/22/99
+ */
+
+#include <linux/uaccess.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/fcdevice.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <linux/timer.h>
+#include <linux/net.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <linux/export.h>
+#include <net/arp.h>
+
+/*
+ * Put the headers on a Fibre Channel packet.
+ */
+
+static int fc_header(struct sk_buff *skb, struct net_device *dev,
+ unsigned short type,
+ const void *daddr, const void *saddr, unsigned int len)
+{
+ struct fch_hdr *fch;
+ int hdr_len;
+
+ /*
+ * Add the 802.2 SNAP header if IP as the IPv4 code calls
+ * dev->hard_header directly.
+ */
+ if (type == ETH_P_IP || type == ETH_P_ARP)
+ {
+ struct fcllc *fcllc;
+
+ hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
+ fch = skb_push(skb, hdr_len);
+ fcllc = (struct fcllc *)(fch+1);
+ fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
+ fcllc->llc = UI_CMD;
+ fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
+ fcllc->ethertype = htons(type);
+ }
+ else
+ {
+ hdr_len = sizeof(struct fch_hdr);
+ fch = skb_push(skb, hdr_len);
+ }
+
+ if(saddr)
+ memcpy(fch->saddr,saddr,dev->addr_len);
+ else
+ memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
+
+ if(daddr)
+ {
+ memcpy(fch->daddr,daddr,dev->addr_len);
+ return hdr_len;
+ }
+ return -hdr_len;
+}
+
+static const struct header_ops fc_header_ops = {
+ .create = fc_header,
+};
+
+static void fc_setup(struct net_device *dev)
+{
+ dev->header_ops = &fc_header_ops;
+ dev->type = ARPHRD_IEEE802;
+ dev->hard_header_len = FC_HLEN;
+ dev->mtu = 2024;
+ dev->addr_len = FC_ALEN;
+ dev->tx_queue_len = 100; /* Long queues on fc */
+ dev->flags = IFF_BROADCAST;
+
+ memset(dev->broadcast, 0xFF, FC_ALEN);
+}
+
+/**
+ * alloc_fcdev - Register fibre channel device
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ * for this fibre channel device
+ *
+ * Fill in the fields of the device structure with fibre channel-generic values.
+ *
+ * Constructs a new net device, complete with a private data area of
+ * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
+ * this private data area.
+ */
+struct net_device *alloc_fcdev(int sizeof_priv)
+{
+ return alloc_netdev(sizeof_priv, "fc%d", NET_NAME_UNKNOWN, fc_setup);
+}
+EXPORT_SYMBOL(alloc_fcdev);
diff --git a/net/802/fddi.c b/net/802/fddi.c
new file mode 100644
index 0000000..90f1416
--- /dev/null
+++ b/net/802/fddi.c
@@ -0,0 +1,182 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * FDDI-type device handling.
+ *
+ * Version: @(#)fddi.c 1.0.0 08/12/96
+ *
+ * Authors: Lawrence V. Stefani, <stefani@lkg.dec.com>
+ *
+ * fddi.c is based on previous eth.c and tr.c work by
+ * Ross Biro
+ * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ * Mark Evans, <evansmp@uhura.aston.ac.uk>
+ * Florian La Roche, <rzsfl@rz.uni-sb.de>
+ * Alan Cox, <gw4pts@gw4pts.ampr.org>
+ *
+ * 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.
+ *
+ * Changes
+ * Alan Cox : New arp/rebuild header
+ * Maciej W. Rozycki : IPv6 support
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/fddidevice.h>
+#include <linux/if_ether.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <net/arp.h>
+#include <net/sock.h>
+
+/*
+ * Create the FDDI MAC header for an arbitrary protocol layer
+ *
+ * saddr=NULL means use device source address
+ * daddr=NULL means leave destination address (eg unresolved arp)
+ */
+
+static int fddi_header(struct sk_buff *skb, struct net_device *dev,
+ unsigned short type,
+ const void *daddr, const void *saddr, unsigned int len)
+{
+ int hl = FDDI_K_SNAP_HLEN;
+ struct fddihdr *fddi;
+
+ if(type != ETH_P_IP && type != ETH_P_IPV6 && type != ETH_P_ARP)
+ hl=FDDI_K_8022_HLEN-3;
+ fddi = skb_push(skb, hl);
+ fddi->fc = FDDI_FC_K_ASYNC_LLC_DEF;
+ if(type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
+ {
+ fddi->hdr.llc_snap.dsap = FDDI_EXTENDED_SAP;
+ fddi->hdr.llc_snap.ssap = FDDI_EXTENDED_SAP;
+ fddi->hdr.llc_snap.ctrl = FDDI_UI_CMD;
+ fddi->hdr.llc_snap.oui[0] = 0x00;
+ fddi->hdr.llc_snap.oui[1] = 0x00;
+ fddi->hdr.llc_snap.oui[2] = 0x00;
+ fddi->hdr.llc_snap.ethertype = htons(type);
+ }
+
+ /* Set the source and destination hardware addresses */
+
+ if (saddr != NULL)
+ memcpy(fddi->saddr, saddr, dev->addr_len);
+ else
+ memcpy(fddi->saddr, dev->dev_addr, dev->addr_len);
+
+ if (daddr != NULL)
+ {
+ memcpy(fddi->daddr, daddr, dev->addr_len);
+ return hl;
+ }
+
+ return -hl;
+}
+
+/*
+ * Determine the packet's protocol ID and fill in skb fields.
+ * This routine is called before an incoming packet is passed
+ * up. It's used to fill in specific skb fields and to set
+ * the proper pointer to the start of packet data (skb->data).
+ */
+
+__be16 fddi_type_trans(struct sk_buff *skb, struct net_device *dev)
+{
+ struct fddihdr *fddi = (struct fddihdr *)skb->data;
+ __be16 type;
+
+ /*
+ * Set mac.raw field to point to FC byte, set data field to point
+ * to start of packet data. Assume 802.2 SNAP frames for now.
+ */
+
+ skb->dev = dev;
+ skb_reset_mac_header(skb); /* point to frame control (FC) */
+
+ if(fddi->hdr.llc_8022_1.dsap==0xe0)
+ {
+ skb_pull(skb, FDDI_K_8022_HLEN-3);
+ type = htons(ETH_P_802_2);
+ }
+ else
+ {
+ skb_pull(skb, FDDI_K_SNAP_HLEN); /* adjust for 21 byte header */
+ type=fddi->hdr.llc_snap.ethertype;
+ }
+
+ /* Set packet type based on destination address and flag settings */
+
+ if (*fddi->daddr & 0x01)
+ {
+ if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0)
+ skb->pkt_type = PACKET_BROADCAST;
+ else
+ skb->pkt_type = PACKET_MULTICAST;
+ }
+
+ else if (dev->flags & IFF_PROMISC)
+ {
+ if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN))
+ skb->pkt_type = PACKET_OTHERHOST;
+ }
+
+ /* Assume 802.2 SNAP frames, for now */
+
+ return type;
+}
+
+EXPORT_SYMBOL(fddi_type_trans);
+
+static const struct header_ops fddi_header_ops = {
+ .create = fddi_header,
+};
+
+
+static void fddi_setup(struct net_device *dev)
+{
+ dev->header_ops = &fddi_header_ops;
+ dev->type = ARPHRD_FDDI;
+ dev->hard_header_len = FDDI_K_SNAP_HLEN+3; /* Assume 802.2 SNAP hdr len + 3 pad bytes */
+ dev->mtu = FDDI_K_SNAP_DLEN; /* Assume max payload of 802.2 SNAP frame */
+ dev->min_mtu = FDDI_K_SNAP_HLEN;
+ dev->max_mtu = FDDI_K_SNAP_DLEN;
+ dev->addr_len = FDDI_K_ALEN;
+ dev->tx_queue_len = 100; /* Long queues on FDDI */
+ dev->flags = IFF_BROADCAST | IFF_MULTICAST;
+
+ memset(dev->broadcast, 0xFF, FDDI_K_ALEN);
+}
+
+/**
+ * alloc_fddidev - Register FDDI device
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ * for this FDDI device
+ *
+ * Fill in the fields of the device structure with FDDI-generic values.
+ *
+ * Constructs a new net device, complete with a private data area of
+ * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
+ * this private data area.
+ */
+struct net_device *alloc_fddidev(int sizeof_priv)
+{
+ return alloc_netdev(sizeof_priv, "fddi%d", NET_NAME_UNKNOWN,
+ fddi_setup);
+}
+EXPORT_SYMBOL(alloc_fddidev);
+
+MODULE_LICENSE("GPL");
diff --git a/net/802/garp.c b/net/802/garp.c
new file mode 100644
index 0000000..7f50d47
--- /dev/null
+++ b/net/802/garp.c
@@ -0,0 +1,638 @@
+/*
+ * IEEE 802.1D Generic Attribute Registration Protocol (GARP)
+ *
+ * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/rtnetlink.h>
+#include <linux/llc.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <net/llc.h>
+#include <net/llc_pdu.h>
+#include <net/garp.h>
+#include <asm/unaligned.h>
+
+static unsigned int garp_join_time __read_mostly = 200;
+module_param(garp_join_time, uint, 0644);
+MODULE_PARM_DESC(garp_join_time, "Join time in ms (default 200ms)");
+MODULE_LICENSE("GPL");
+
+static const struct garp_state_trans {
+ u8 state;
+ u8 action;
+} garp_applicant_state_table[GARP_APPLICANT_MAX + 1][GARP_EVENT_MAX + 1] = {
+ [GARP_APPLICANT_VA] = {
+ [GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_AA,
+ .action = GARP_ACTION_S_JOIN_IN },
+ [GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_AA },
+ [GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VA },
+ [GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VA },
+ [GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VA },
+ [GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_INVALID },
+ [GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_LA },
+ },
+ [GARP_APPLICANT_AA] = {
+ [GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_QA,
+ .action = GARP_ACTION_S_JOIN_IN },
+ [GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_QA },
+ [GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VA },
+ [GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VA },
+ [GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VA },
+ [GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_INVALID },
+ [GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_LA },
+ },
+ [GARP_APPLICANT_QA] = {
+ [GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_INVALID },
+ [GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_QA },
+ [GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VA },
+ [GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VA },
+ [GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_INVALID },
+ [GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_LA },
+ },
+ [GARP_APPLICANT_LA] = {
+ [GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_VO,
+ .action = GARP_ACTION_S_LEAVE_EMPTY },
+ [GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_LA },
+ [GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VO },
+ [GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_LA },
+ [GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_LA },
+ [GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VO },
+ [GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_VA },
+ [GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_INVALID },
+ },
+ [GARP_APPLICANT_VP] = {
+ [GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_AA,
+ .action = GARP_ACTION_S_JOIN_IN },
+ [GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_AP },
+ [GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_INVALID },
+ [GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_VO },
+ },
+ [GARP_APPLICANT_AP] = {
+ [GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_QA,
+ .action = GARP_ACTION_S_JOIN_IN },
+ [GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_QP },
+ [GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_INVALID },
+ [GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_AO },
+ },
+ [GARP_APPLICANT_QP] = {
+ [GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_INVALID },
+ [GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_QP },
+ [GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_INVALID },
+ [GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_QO },
+ },
+ [GARP_APPLICANT_VO] = {
+ [GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_INVALID },
+ [GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_AO },
+ [GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VO },
+ [GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VO },
+ [GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VO },
+ [GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VO },
+ [GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_VP },
+ [GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_INVALID },
+ },
+ [GARP_APPLICANT_AO] = {
+ [GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_INVALID },
+ [GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_QO },
+ [GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VO },
+ [GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VO },
+ [GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VO },
+ [GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VO },
+ [GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_AP },
+ [GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_INVALID },
+ },
+ [GARP_APPLICANT_QO] = {
+ [GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_INVALID },
+ [GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_QO },
+ [GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VO },
+ [GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VO },
+ [GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VO },
+ [GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VO },
+ [GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_QP },
+ [GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_INVALID },
+ },
+};
+
+static int garp_attr_cmp(const struct garp_attr *attr,
+ const void *data, u8 len, u8 type)
+{
+ if (attr->type != type)
+ return attr->type - type;
+ if (attr->dlen != len)
+ return attr->dlen - len;
+ return memcmp(attr->data, data, len);
+}
+
+static struct garp_attr *garp_attr_lookup(const struct garp_applicant *app,
+ const void *data, u8 len, u8 type)
+{
+ struct rb_node *parent = app->gid.rb_node;
+ struct garp_attr *attr;
+ int d;
+
+ while (parent) {
+ attr = rb_entry(parent, struct garp_attr, node);
+ d = garp_attr_cmp(attr, data, len, type);
+ if (d > 0)
+ parent = parent->rb_left;
+ else if (d < 0)
+ parent = parent->rb_right;
+ else
+ return attr;
+ }
+ return NULL;
+}
+
+static struct garp_attr *garp_attr_create(struct garp_applicant *app,
+ const void *data, u8 len, u8 type)
+{
+ struct rb_node *parent = NULL, **p = &app->gid.rb_node;
+ struct garp_attr *attr;
+ int d;
+
+ while (*p) {
+ parent = *p;
+ attr = rb_entry(parent, struct garp_attr, node);
+ d = garp_attr_cmp(attr, data, len, type);
+ if (d > 0)
+ p = &parent->rb_left;
+ else if (d < 0)
+ p = &parent->rb_right;
+ else {
+ /* The attribute already exists; re-use it. */
+ return attr;
+ }
+ }
+ attr = kmalloc(sizeof(*attr) + len, GFP_ATOMIC);
+ if (!attr)
+ return attr;
+ attr->state = GARP_APPLICANT_VO;
+ attr->type = type;
+ attr->dlen = len;
+ memcpy(attr->data, data, len);
+
+ rb_link_node(&attr->node, parent, p);
+ rb_insert_color(&attr->node, &app->gid);
+ return attr;
+}
+
+static void garp_attr_destroy(struct garp_applicant *app, struct garp_attr *attr)
+{
+ rb_erase(&attr->node, &app->gid);
+ kfree(attr);
+}
+
+static int garp_pdu_init(struct garp_applicant *app)
+{
+ struct sk_buff *skb;
+ struct garp_pdu_hdr *gp;
+
+#define LLC_RESERVE sizeof(struct llc_pdu_un)
+ skb = alloc_skb(app->dev->mtu + LL_RESERVED_SPACE(app->dev),
+ GFP_ATOMIC);
+ if (!skb)
+ return -ENOMEM;
+
+ skb->dev = app->dev;
+ skb->protocol = htons(ETH_P_802_2);
+ skb_reserve(skb, LL_RESERVED_SPACE(app->dev) + LLC_RESERVE);
+
+ gp = __skb_put(skb, sizeof(*gp));
+ put_unaligned(htons(GARP_PROTOCOL_ID), &gp->protocol);
+
+ app->pdu = skb;
+ return 0;
+}
+
+static int garp_pdu_append_end_mark(struct garp_applicant *app)
+{
+ if (skb_tailroom(app->pdu) < sizeof(u8))
+ return -1;
+ __skb_put_u8(app->pdu, GARP_END_MARK);
+ return 0;
+}
+
+static void garp_pdu_queue(struct garp_applicant *app)
+{
+ if (!app->pdu)
+ return;
+
+ garp_pdu_append_end_mark(app);
+ garp_pdu_append_end_mark(app);
+
+ llc_pdu_header_init(app->pdu, LLC_PDU_TYPE_U, LLC_SAP_BSPAN,
+ LLC_SAP_BSPAN, LLC_PDU_CMD);
+ llc_pdu_init_as_ui_cmd(app->pdu);
+ llc_mac_hdr_init(app->pdu, app->dev->dev_addr,
+ app->app->proto.group_address);
+
+ skb_queue_tail(&app->queue, app->pdu);
+ app->pdu = NULL;
+}
+
+static void garp_queue_xmit(struct garp_applicant *app)
+{
+ struct sk_buff *skb;
+
+ while ((skb = skb_dequeue(&app->queue)))
+ dev_queue_xmit(skb);
+}
+
+static int garp_pdu_append_msg(struct garp_applicant *app, u8 attrtype)
+{
+ struct garp_msg_hdr *gm;
+
+ if (skb_tailroom(app->pdu) < sizeof(*gm))
+ return -1;
+ gm = __skb_put(app->pdu, sizeof(*gm));
+ gm->attrtype = attrtype;
+ garp_cb(app->pdu)->cur_type = attrtype;
+ return 0;
+}
+
+static int garp_pdu_append_attr(struct garp_applicant *app,
+ const struct garp_attr *attr,
+ enum garp_attr_event event)
+{
+ struct garp_attr_hdr *ga;
+ unsigned int len;
+ int err;
+again:
+ if (!app->pdu) {
+ err = garp_pdu_init(app);
+ if (err < 0)
+ return err;
+ }
+
+ if (garp_cb(app->pdu)->cur_type != attr->type) {
+ if (garp_cb(app->pdu)->cur_type &&
+ garp_pdu_append_end_mark(app) < 0)
+ goto queue;
+ if (garp_pdu_append_msg(app, attr->type) < 0)
+ goto queue;
+ }
+
+ len = sizeof(*ga) + attr->dlen;
+ if (skb_tailroom(app->pdu) < len)
+ goto queue;
+ ga = __skb_put(app->pdu, len);
+ ga->len = len;
+ ga->event = event;
+ memcpy(ga->data, attr->data, attr->dlen);
+ return 0;
+
+queue:
+ garp_pdu_queue(app);
+ goto again;
+}
+
+static void garp_attr_event(struct garp_applicant *app,
+ struct garp_attr *attr, enum garp_event event)
+{
+ enum garp_applicant_state state;
+
+ state = garp_applicant_state_table[attr->state][event].state;
+ if (state == GARP_APPLICANT_INVALID)
+ return;
+
+ switch (garp_applicant_state_table[attr->state][event].action) {
+ case GARP_ACTION_NONE:
+ break;
+ case GARP_ACTION_S_JOIN_IN:
+ /* When appending the attribute fails, don't update state in
+ * order to retry on next TRANSMIT_PDU event. */
+ if (garp_pdu_append_attr(app, attr, GARP_JOIN_IN) < 0)
+ return;
+ break;
+ case GARP_ACTION_S_LEAVE_EMPTY:
+ garp_pdu_append_attr(app, attr, GARP_LEAVE_EMPTY);
+ /* As a pure applicant, sending a leave message implies that
+ * the attribute was unregistered and can be destroyed. */
+ garp_attr_destroy(app, attr);
+ return;
+ default:
+ WARN_ON(1);
+ }
+
+ attr->state = state;
+}
+
+int garp_request_join(const struct net_device *dev,
+ const struct garp_application *appl,
+ const void *data, u8 len, u8 type)
+{
+ struct garp_port *port = rtnl_dereference(dev->garp_port);
+ struct garp_applicant *app = rtnl_dereference(port->applicants[appl->type]);
+ struct garp_attr *attr;
+
+ spin_lock_bh(&app->lock);
+ attr = garp_attr_create(app, data, len, type);
+ if (!attr) {
+ spin_unlock_bh(&app->lock);
+ return -ENOMEM;
+ }
+ garp_attr_event(app, attr, GARP_EVENT_REQ_JOIN);
+ spin_unlock_bh(&app->lock);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(garp_request_join);
+
+void garp_request_leave(const struct net_device *dev,
+ const struct garp_application *appl,
+ const void *data, u8 len, u8 type)
+{
+ struct garp_port *port = rtnl_dereference(dev->garp_port);
+ struct garp_applicant *app = rtnl_dereference(port->applicants[appl->type]);
+ struct garp_attr *attr;
+
+ spin_lock_bh(&app->lock);
+ attr = garp_attr_lookup(app, data, len, type);
+ if (!attr) {
+ spin_unlock_bh(&app->lock);
+ return;
+ }
+ garp_attr_event(app, attr, GARP_EVENT_REQ_LEAVE);
+ spin_unlock_bh(&app->lock);
+}
+EXPORT_SYMBOL_GPL(garp_request_leave);
+
+static void garp_gid_event(struct garp_applicant *app, enum garp_event event)
+{
+ struct rb_node *node, *next;
+ struct garp_attr *attr;
+
+ for (node = rb_first(&app->gid);
+ next = node ? rb_next(node) : NULL, node != NULL;
+ node = next) {
+ attr = rb_entry(node, struct garp_attr, node);
+ garp_attr_event(app, attr, event);
+ }
+}
+
+static void garp_join_timer_arm(struct garp_applicant *app)
+{
+ unsigned long delay;
+
+ delay = (u64)msecs_to_jiffies(garp_join_time) * prandom_u32() >> 32;
+ mod_timer(&app->join_timer, jiffies + delay);
+}
+
+static void garp_join_timer(struct timer_list *t)
+{
+ struct garp_applicant *app = from_timer(app, t, join_timer);
+
+ spin_lock(&app->lock);
+ garp_gid_event(app, GARP_EVENT_TRANSMIT_PDU);
+ garp_pdu_queue(app);
+ spin_unlock(&app->lock);
+
+ garp_queue_xmit(app);
+ garp_join_timer_arm(app);
+}
+
+static int garp_pdu_parse_end_mark(struct sk_buff *skb)
+{
+ if (!pskb_may_pull(skb, sizeof(u8)))
+ return -1;
+ if (*skb->data == GARP_END_MARK) {
+ skb_pull(skb, sizeof(u8));
+ return -1;
+ }
+ return 0;
+}
+
+static int garp_pdu_parse_attr(struct garp_applicant *app, struct sk_buff *skb,
+ u8 attrtype)
+{
+ const struct garp_attr_hdr *ga;
+ struct garp_attr *attr;
+ enum garp_event event;
+ unsigned int dlen;
+
+ if (!pskb_may_pull(skb, sizeof(*ga)))
+ return -1;
+ ga = (struct garp_attr_hdr *)skb->data;
+ if (ga->len < sizeof(*ga))
+ return -1;
+
+ if (!pskb_may_pull(skb, ga->len))
+ return -1;
+ skb_pull(skb, ga->len);
+ dlen = sizeof(*ga) - ga->len;
+
+ if (attrtype > app->app->maxattr)
+ return 0;
+
+ switch (ga->event) {
+ case GARP_LEAVE_ALL:
+ if (dlen != 0)
+ return -1;
+ garp_gid_event(app, GARP_EVENT_R_LEAVE_EMPTY);
+ return 0;
+ case GARP_JOIN_EMPTY:
+ event = GARP_EVENT_R_JOIN_EMPTY;
+ break;
+ case GARP_JOIN_IN:
+ event = GARP_EVENT_R_JOIN_IN;
+ break;
+ case GARP_LEAVE_EMPTY:
+ event = GARP_EVENT_R_LEAVE_EMPTY;
+ break;
+ case GARP_EMPTY:
+ event = GARP_EVENT_R_EMPTY;
+ break;
+ default:
+ return 0;
+ }
+
+ if (dlen == 0)
+ return -1;
+ attr = garp_attr_lookup(app, ga->data, dlen, attrtype);
+ if (attr == NULL)
+ return 0;
+ garp_attr_event(app, attr, event);
+ return 0;
+}
+
+static int garp_pdu_parse_msg(struct garp_applicant *app, struct sk_buff *skb)
+{
+ const struct garp_msg_hdr *gm;
+
+ if (!pskb_may_pull(skb, sizeof(*gm)))
+ return -1;
+ gm = (struct garp_msg_hdr *)skb->data;
+ if (gm->attrtype == 0)
+ return -1;
+ skb_pull(skb, sizeof(*gm));
+
+ while (skb->len > 0) {
+ if (garp_pdu_parse_attr(app, skb, gm->attrtype) < 0)
+ return -1;
+ if (garp_pdu_parse_end_mark(skb) < 0)
+ break;
+ }
+ return 0;
+}
+
+static void garp_pdu_rcv(const struct stp_proto *proto, struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct garp_application *appl = proto->data;
+ struct garp_port *port;
+ struct garp_applicant *app;
+ const struct garp_pdu_hdr *gp;
+
+ port = rcu_dereference(dev->garp_port);
+ if (!port)
+ goto err;
+ app = rcu_dereference(port->applicants[appl->type]);
+ if (!app)
+ goto err;
+
+ if (!pskb_may_pull(skb, sizeof(*gp)))
+ goto err;
+ gp = (struct garp_pdu_hdr *)skb->data;
+ if (get_unaligned(&gp->protocol) != htons(GARP_PROTOCOL_ID))
+ goto err;
+ skb_pull(skb, sizeof(*gp));
+
+ spin_lock(&app->lock);
+ while (skb->len > 0) {
+ if (garp_pdu_parse_msg(app, skb) < 0)
+ break;
+ if (garp_pdu_parse_end_mark(skb) < 0)
+ break;
+ }
+ spin_unlock(&app->lock);
+err:
+ kfree_skb(skb);
+}
+
+static int garp_init_port(struct net_device *dev)
+{
+ struct garp_port *port;
+
+ port = kzalloc(sizeof(*port), GFP_KERNEL);
+ if (!port)
+ return -ENOMEM;
+ rcu_assign_pointer(dev->garp_port, port);
+ return 0;
+}
+
+static void garp_release_port(struct net_device *dev)
+{
+ struct garp_port *port = rtnl_dereference(dev->garp_port);
+ unsigned int i;
+
+ for (i = 0; i <= GARP_APPLICATION_MAX; i++) {
+ if (rtnl_dereference(port->applicants[i]))
+ return;
+ }
+ RCU_INIT_POINTER(dev->garp_port, NULL);
+ kfree_rcu(port, rcu);
+}
+
+int garp_init_applicant(struct net_device *dev, struct garp_application *appl)
+{
+ struct garp_applicant *app;
+ int err;
+
+ ASSERT_RTNL();
+
+ if (!rtnl_dereference(dev->garp_port)) {
+ err = garp_init_port(dev);
+ if (err < 0)
+ goto err1;
+ }
+
+ err = -ENOMEM;
+ app = kzalloc(sizeof(*app), GFP_KERNEL);
+ if (!app)
+ goto err2;
+
+ err = dev_mc_add(dev, appl->proto.group_address);
+ if (err < 0)
+ goto err3;
+
+ app->dev = dev;
+ app->app = appl;
+ app->gid = RB_ROOT;
+ spin_lock_init(&app->lock);
+ skb_queue_head_init(&app->queue);
+ rcu_assign_pointer(dev->garp_port->applicants[appl->type], app);
+ timer_setup(&app->join_timer, garp_join_timer, 0);
+ garp_join_timer_arm(app);
+ return 0;
+
+err3:
+ kfree(app);
+err2:
+ garp_release_port(dev);
+err1:
+ return err;
+}
+EXPORT_SYMBOL_GPL(garp_init_applicant);
+
+void garp_uninit_applicant(struct net_device *dev, struct garp_application *appl)
+{
+ struct garp_port *port = rtnl_dereference(dev->garp_port);
+ struct garp_applicant *app = rtnl_dereference(port->applicants[appl->type]);
+
+ ASSERT_RTNL();
+
+ RCU_INIT_POINTER(port->applicants[appl->type], NULL);
+
+ /* Delete timer and generate a final TRANSMIT_PDU event to flush out
+ * all pending messages before the applicant is gone. */
+ del_timer_sync(&app->join_timer);
+
+ spin_lock_bh(&app->lock);
+ garp_gid_event(app, GARP_EVENT_TRANSMIT_PDU);
+ garp_pdu_queue(app);
+ spin_unlock_bh(&app->lock);
+
+ garp_queue_xmit(app);
+
+ dev_mc_del(dev, appl->proto.group_address);
+ kfree_rcu(app, rcu);
+ garp_release_port(dev);
+}
+EXPORT_SYMBOL_GPL(garp_uninit_applicant);
+
+int garp_register_application(struct garp_application *appl)
+{
+ appl->proto.rcv = garp_pdu_rcv;
+ appl->proto.data = appl;
+ return stp_proto_register(&appl->proto);
+}
+EXPORT_SYMBOL_GPL(garp_register_application);
+
+void garp_unregister_application(struct garp_application *appl)
+{
+ stp_proto_unregister(&appl->proto);
+}
+EXPORT_SYMBOL_GPL(garp_unregister_application);
diff --git a/net/802/hippi.c b/net/802/hippi.c
new file mode 100644
index 0000000..690308b
--- /dev/null
+++ b/net/802/hippi.c
@@ -0,0 +1,197 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * HIPPI-type device handling.
+ *
+ * Version: @(#)hippi.c 1.0.0 05/29/97
+ *
+ * Authors: Ross Biro
+ * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ * Mark Evans, <evansmp@uhura.aston.ac.uk>
+ * Florian La Roche, <rzsfl@rz.uni-sb.de>
+ * Alan Cox, <gw4pts@gw4pts.ampr.org>
+ * Jes Sorensen, <Jes.Sorensen@cern.ch>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/hippidevice.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <net/arp.h>
+#include <net/sock.h>
+#include <linux/uaccess.h>
+
+/*
+ * Create the HIPPI MAC header for an arbitrary protocol layer
+ *
+ * saddr=NULL means use device source address
+ * daddr=NULL means leave destination address (eg unresolved arp)
+ */
+
+static int hippi_header(struct sk_buff *skb, struct net_device *dev,
+ unsigned short type,
+ const void *daddr, const void *saddr, unsigned int len)
+{
+ struct hippi_hdr *hip = skb_push(skb, HIPPI_HLEN);
+ struct hippi_cb *hcb = (struct hippi_cb *) skb->cb;
+
+ if (!len){
+ len = skb->len - HIPPI_HLEN;
+ printk("hippi_header(): length not supplied\n");
+ }
+
+ /*
+ * Due to the stupidity of the little endian byte-order we
+ * have to set the fp field this way.
+ */
+ hip->fp.fixed = htonl(0x04800018);
+ hip->fp.d2_size = htonl(len + 8);
+ hip->le.fc = 0;
+ hip->le.double_wide = 0; /* only HIPPI 800 for the time being */
+ hip->le.message_type = 0; /* Data PDU */
+
+ hip->le.dest_addr_type = 2; /* 12 bit SC address */
+ hip->le.src_addr_type = 2; /* 12 bit SC address */
+
+ memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
+ memset(&hip->le.reserved, 0, 16);
+
+ hip->snap.dsap = HIPPI_EXTENDED_SAP;
+ hip->snap.ssap = HIPPI_EXTENDED_SAP;
+ hip->snap.ctrl = HIPPI_UI_CMD;
+ hip->snap.oui[0] = 0x00;
+ hip->snap.oui[1] = 0x00;
+ hip->snap.oui[2] = 0x00;
+ hip->snap.ethertype = htons(type);
+
+ if (daddr)
+ {
+ memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
+ memcpy(&hcb->ifield, daddr + 2, 4);
+ return HIPPI_HLEN;
+ }
+ hcb->ifield = 0;
+ return -((int)HIPPI_HLEN);
+}
+
+
+/*
+ * Determine the packet's protocol ID.
+ */
+
+__be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
+{
+ struct hippi_hdr *hip;
+
+ /*
+ * This is actually wrong ... question is if we really should
+ * set the raw address here.
+ */
+ skb->dev = dev;
+ skb_reset_mac_header(skb);
+ hip = (struct hippi_hdr *)skb_mac_header(skb);
+ skb_pull(skb, HIPPI_HLEN);
+
+ /*
+ * No fancy promisc stuff here now.
+ */
+
+ return hip->snap.ethertype;
+}
+
+EXPORT_SYMBOL(hippi_type_trans);
+
+/*
+ * For HIPPI we will actually use the lower 4 bytes of the hardware
+ * address as the I-FIELD rather than the actual hardware address.
+ */
+int hippi_mac_addr(struct net_device *dev, void *p)
+{
+ struct sockaddr *addr = p;
+ if (netif_running(dev))
+ return -EBUSY;
+ memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
+ return 0;
+}
+EXPORT_SYMBOL(hippi_mac_addr);
+
+int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
+{
+ /* Never send broadcast/multicast ARP messages */
+ NEIGH_VAR_INIT(p, MCAST_PROBES, 0);
+
+ /* In IPv6 unicast probes are valid even on NBMA,
+ * because they are encapsulated in normal IPv6 protocol.
+ * Should be a generic flag.
+ */
+ if (p->tbl->family != AF_INET6)
+ NEIGH_VAR_INIT(p, UCAST_PROBES, 0);
+ return 0;
+}
+EXPORT_SYMBOL(hippi_neigh_setup_dev);
+
+static const struct header_ops hippi_header_ops = {
+ .create = hippi_header,
+};
+
+
+static void hippi_setup(struct net_device *dev)
+{
+ dev->header_ops = &hippi_header_ops;
+
+ /*
+ * We don't support HIPPI `ARP' for the time being, and probably
+ * never will unless someone else implements it. However we
+ * still need a fake ARPHRD to make ifconfig and friends play ball.
+ */
+ dev->type = ARPHRD_HIPPI;
+ dev->hard_header_len = HIPPI_HLEN;
+ dev->mtu = 65280;
+ dev->min_mtu = 68;
+ dev->max_mtu = 65280;
+ dev->addr_len = HIPPI_ALEN;
+ dev->tx_queue_len = 25 /* 5 */;
+ memset(dev->broadcast, 0xFF, HIPPI_ALEN);
+
+
+ /*
+ * HIPPI doesn't support broadcast+multicast and we only use
+ * static ARP tables. ARP is disabled by hippi_neigh_setup_dev.
+ */
+ dev->flags = 0;
+}
+
+/**
+ * alloc_hippi_dev - Register HIPPI device
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ * for this HIPPI device
+ *
+ * Fill in the fields of the device structure with HIPPI-generic values.
+ *
+ * Constructs a new net device, complete with a private data area of
+ * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
+ * this private data area.
+ */
+
+struct net_device *alloc_hippi_dev(int sizeof_priv)
+{
+ return alloc_netdev(sizeof_priv, "hip%d", NET_NAME_UNKNOWN,
+ hippi_setup);
+}
+
+EXPORT_SYMBOL(alloc_hippi_dev);
diff --git a/net/802/mrp.c b/net/802/mrp.c
new file mode 100644
index 0000000..a808dd5
--- /dev/null
+++ b/net/802/mrp.c
@@ -0,0 +1,924 @@
+/*
+ * IEEE 802.1Q Multiple Registration Protocol (MRP)
+ *
+ * Copyright (c) 2012 Massachusetts Institute of Technology
+ *
+ * Adapted from code in net/802/garp.c
+ * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/rtnetlink.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <net/mrp.h>
+#include <asm/unaligned.h>
+
+static unsigned int mrp_join_time __read_mostly = 200;
+module_param(mrp_join_time, uint, 0644);
+MODULE_PARM_DESC(mrp_join_time, "Join time in ms (default 200ms)");
+
+static unsigned int mrp_periodic_time __read_mostly = 1000;
+module_param(mrp_periodic_time, uint, 0644);
+MODULE_PARM_DESC(mrp_periodic_time, "Periodic time in ms (default 1s)");
+
+MODULE_LICENSE("GPL");
+
+static const u8
+mrp_applicant_state_table[MRP_APPLICANT_MAX + 1][MRP_EVENT_MAX + 1] = {
+ [MRP_APPLICANT_VO] = {
+ [MRP_EVENT_NEW] = MRP_APPLICANT_VN,
+ [MRP_EVENT_JOIN] = MRP_APPLICANT_VP,
+ [MRP_EVENT_LV] = MRP_APPLICANT_VO,
+ [MRP_EVENT_TX] = MRP_APPLICANT_VO,
+ [MRP_EVENT_R_NEW] = MRP_APPLICANT_VO,
+ [MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_AO,
+ [MRP_EVENT_R_IN] = MRP_APPLICANT_VO,
+ [MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_VO,
+ [MRP_EVENT_R_MT] = MRP_APPLICANT_VO,
+ [MRP_EVENT_R_LV] = MRP_APPLICANT_VO,
+ [MRP_EVENT_R_LA] = MRP_APPLICANT_VO,
+ [MRP_EVENT_REDECLARE] = MRP_APPLICANT_VO,
+ [MRP_EVENT_PERIODIC] = MRP_APPLICANT_VO,
+ },
+ [MRP_APPLICANT_VP] = {
+ [MRP_EVENT_NEW] = MRP_APPLICANT_VN,
+ [MRP_EVENT_JOIN] = MRP_APPLICANT_VP,
+ [MRP_EVENT_LV] = MRP_APPLICANT_VO,
+ [MRP_EVENT_TX] = MRP_APPLICANT_AA,
+ [MRP_EVENT_R_NEW] = MRP_APPLICANT_VP,
+ [MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_AP,
+ [MRP_EVENT_R_IN] = MRP_APPLICANT_VP,
+ [MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_VP,
+ [MRP_EVENT_R_MT] = MRP_APPLICANT_VP,
+ [MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
+ [MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
+ [MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
+ [MRP_EVENT_PERIODIC] = MRP_APPLICANT_VP,
+ },
+ [MRP_APPLICANT_VN] = {
+ [MRP_EVENT_NEW] = MRP_APPLICANT_VN,
+ [MRP_EVENT_JOIN] = MRP_APPLICANT_VN,
+ [MRP_EVENT_LV] = MRP_APPLICANT_LA,
+ [MRP_EVENT_TX] = MRP_APPLICANT_AN,
+ [MRP_EVENT_R_NEW] = MRP_APPLICANT_VN,
+ [MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_VN,
+ [MRP_EVENT_R_IN] = MRP_APPLICANT_VN,
+ [MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_VN,
+ [MRP_EVENT_R_MT] = MRP_APPLICANT_VN,
+ [MRP_EVENT_R_LV] = MRP_APPLICANT_VN,
+ [MRP_EVENT_R_LA] = MRP_APPLICANT_VN,
+ [MRP_EVENT_REDECLARE] = MRP_APPLICANT_VN,
+ [MRP_EVENT_PERIODIC] = MRP_APPLICANT_VN,
+ },
+ [MRP_APPLICANT_AN] = {
+ [MRP_EVENT_NEW] = MRP_APPLICANT_AN,
+ [MRP_EVENT_JOIN] = MRP_APPLICANT_AN,
+ [MRP_EVENT_LV] = MRP_APPLICANT_LA,
+ [MRP_EVENT_TX] = MRP_APPLICANT_QA,
+ [MRP_EVENT_R_NEW] = MRP_APPLICANT_AN,
+ [MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_AN,
+ [MRP_EVENT_R_IN] = MRP_APPLICANT_AN,
+ [MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AN,
+ [MRP_EVENT_R_MT] = MRP_APPLICANT_AN,
+ [MRP_EVENT_R_LV] = MRP_APPLICANT_VN,
+ [MRP_EVENT_R_LA] = MRP_APPLICANT_VN,
+ [MRP_EVENT_REDECLARE] = MRP_APPLICANT_VN,
+ [MRP_EVENT_PERIODIC] = MRP_APPLICANT_AN,
+ },
+ [MRP_APPLICANT_AA] = {
+ [MRP_EVENT_NEW] = MRP_APPLICANT_VN,
+ [MRP_EVENT_JOIN] = MRP_APPLICANT_AA,
+ [MRP_EVENT_LV] = MRP_APPLICANT_LA,
+ [MRP_EVENT_TX] = MRP_APPLICANT_QA,
+ [MRP_EVENT_R_NEW] = MRP_APPLICANT_AA,
+ [MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QA,
+ [MRP_EVENT_R_IN] = MRP_APPLICANT_AA,
+ [MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AA,
+ [MRP_EVENT_R_MT] = MRP_APPLICANT_AA,
+ [MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
+ [MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
+ [MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
+ [MRP_EVENT_PERIODIC] = MRP_APPLICANT_AA,
+ },
+ [MRP_APPLICANT_QA] = {
+ [MRP_EVENT_NEW] = MRP_APPLICANT_VN,
+ [MRP_EVENT_JOIN] = MRP_APPLICANT_QA,
+ [MRP_EVENT_LV] = MRP_APPLICANT_LA,
+ [MRP_EVENT_TX] = MRP_APPLICANT_QA,
+ [MRP_EVENT_R_NEW] = MRP_APPLICANT_QA,
+ [MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QA,
+ [MRP_EVENT_R_IN] = MRP_APPLICANT_QA,
+ [MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AA,
+ [MRP_EVENT_R_MT] = MRP_APPLICANT_AA,
+ [MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
+ [MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
+ [MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
+ [MRP_EVENT_PERIODIC] = MRP_APPLICANT_AA,
+ },
+ [MRP_APPLICANT_LA] = {
+ [MRP_EVENT_NEW] = MRP_APPLICANT_VN,
+ [MRP_EVENT_JOIN] = MRP_APPLICANT_AA,
+ [MRP_EVENT_LV] = MRP_APPLICANT_LA,
+ [MRP_EVENT_TX] = MRP_APPLICANT_VO,
+ [MRP_EVENT_R_NEW] = MRP_APPLICANT_LA,
+ [MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_LA,
+ [MRP_EVENT_R_IN] = MRP_APPLICANT_LA,
+ [MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_LA,
+ [MRP_EVENT_R_MT] = MRP_APPLICANT_LA,
+ [MRP_EVENT_R_LV] = MRP_APPLICANT_LA,
+ [MRP_EVENT_R_LA] = MRP_APPLICANT_LA,
+ [MRP_EVENT_REDECLARE] = MRP_APPLICANT_LA,
+ [MRP_EVENT_PERIODIC] = MRP_APPLICANT_LA,
+ },
+ [MRP_APPLICANT_AO] = {
+ [MRP_EVENT_NEW] = MRP_APPLICANT_VN,
+ [MRP_EVENT_JOIN] = MRP_APPLICANT_AP,
+ [MRP_EVENT_LV] = MRP_APPLICANT_AO,
+ [MRP_EVENT_TX] = MRP_APPLICANT_AO,
+ [MRP_EVENT_R_NEW] = MRP_APPLICANT_AO,
+ [MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QO,
+ [MRP_EVENT_R_IN] = MRP_APPLICANT_AO,
+ [MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AO,
+ [MRP_EVENT_R_MT] = MRP_APPLICANT_AO,
+ [MRP_EVENT_R_LV] = MRP_APPLICANT_VO,
+ [MRP_EVENT_R_LA] = MRP_APPLICANT_VO,
+ [MRP_EVENT_REDECLARE] = MRP_APPLICANT_VO,
+ [MRP_EVENT_PERIODIC] = MRP_APPLICANT_AO,
+ },
+ [MRP_APPLICANT_QO] = {
+ [MRP_EVENT_NEW] = MRP_APPLICANT_VN,
+ [MRP_EVENT_JOIN] = MRP_APPLICANT_QP,
+ [MRP_EVENT_LV] = MRP_APPLICANT_QO,
+ [MRP_EVENT_TX] = MRP_APPLICANT_QO,
+ [MRP_EVENT_R_NEW] = MRP_APPLICANT_QO,
+ [MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QO,
+ [MRP_EVENT_R_IN] = MRP_APPLICANT_QO,
+ [MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AO,
+ [MRP_EVENT_R_MT] = MRP_APPLICANT_AO,
+ [MRP_EVENT_R_LV] = MRP_APPLICANT_VO,
+ [MRP_EVENT_R_LA] = MRP_APPLICANT_VO,
+ [MRP_EVENT_REDECLARE] = MRP_APPLICANT_VO,
+ [MRP_EVENT_PERIODIC] = MRP_APPLICANT_QO,
+ },
+ [MRP_APPLICANT_AP] = {
+ [MRP_EVENT_NEW] = MRP_APPLICANT_VN,
+ [MRP_EVENT_JOIN] = MRP_APPLICANT_AP,
+ [MRP_EVENT_LV] = MRP_APPLICANT_AO,
+ [MRP_EVENT_TX] = MRP_APPLICANT_QA,
+ [MRP_EVENT_R_NEW] = MRP_APPLICANT_AP,
+ [MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QP,
+ [MRP_EVENT_R_IN] = MRP_APPLICANT_AP,
+ [MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AP,
+ [MRP_EVENT_R_MT] = MRP_APPLICANT_AP,
+ [MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
+ [MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
+ [MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
+ [MRP_EVENT_PERIODIC] = MRP_APPLICANT_AP,
+ },
+ [MRP_APPLICANT_QP] = {
+ [MRP_EVENT_NEW] = MRP_APPLICANT_VN,
+ [MRP_EVENT_JOIN] = MRP_APPLICANT_QP,
+ [MRP_EVENT_LV] = MRP_APPLICANT_QO,
+ [MRP_EVENT_TX] = MRP_APPLICANT_QP,
+ [MRP_EVENT_R_NEW] = MRP_APPLICANT_QP,
+ [MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QP,
+ [MRP_EVENT_R_IN] = MRP_APPLICANT_QP,
+ [MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AP,
+ [MRP_EVENT_R_MT] = MRP_APPLICANT_AP,
+ [MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
+ [MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
+ [MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
+ [MRP_EVENT_PERIODIC] = MRP_APPLICANT_AP,
+ },
+};
+
+static const u8
+mrp_tx_action_table[MRP_APPLICANT_MAX + 1] = {
+ [MRP_APPLICANT_VO] = MRP_TX_ACTION_S_IN_OPTIONAL,
+ [MRP_APPLICANT_VP] = MRP_TX_ACTION_S_JOIN_IN,
+ [MRP_APPLICANT_VN] = MRP_TX_ACTION_S_NEW,
+ [MRP_APPLICANT_AN] = MRP_TX_ACTION_S_NEW,
+ [MRP_APPLICANT_AA] = MRP_TX_ACTION_S_JOIN_IN,
+ [MRP_APPLICANT_QA] = MRP_TX_ACTION_S_JOIN_IN_OPTIONAL,
+ [MRP_APPLICANT_LA] = MRP_TX_ACTION_S_LV,
+ [MRP_APPLICANT_AO] = MRP_TX_ACTION_S_IN_OPTIONAL,
+ [MRP_APPLICANT_QO] = MRP_TX_ACTION_S_IN_OPTIONAL,
+ [MRP_APPLICANT_AP] = MRP_TX_ACTION_S_JOIN_IN,
+ [MRP_APPLICANT_QP] = MRP_TX_ACTION_S_IN_OPTIONAL,
+};
+
+static void mrp_attrvalue_inc(void *value, u8 len)
+{
+ u8 *v = (u8 *)value;
+
+ /* Add 1 to the last byte. If it becomes zero,
+ * go to the previous byte and repeat.
+ */
+ while (len > 0 && !++v[--len])
+ ;
+}
+
+static int mrp_attr_cmp(const struct mrp_attr *attr,
+ const void *value, u8 len, u8 type)
+{
+ if (attr->type != type)
+ return attr->type - type;
+ if (attr->len != len)
+ return attr->len - len;
+ return memcmp(attr->value, value, len);
+}
+
+static struct mrp_attr *mrp_attr_lookup(const struct mrp_applicant *app,
+ const void *value, u8 len, u8 type)
+{
+ struct rb_node *parent = app->mad.rb_node;
+ struct mrp_attr *attr;
+ int d;
+
+ while (parent) {
+ attr = rb_entry(parent, struct mrp_attr, node);
+ d = mrp_attr_cmp(attr, value, len, type);
+ if (d > 0)
+ parent = parent->rb_left;
+ else if (d < 0)
+ parent = parent->rb_right;
+ else
+ return attr;
+ }
+ return NULL;
+}
+
+static struct mrp_attr *mrp_attr_create(struct mrp_applicant *app,
+ const void *value, u8 len, u8 type)
+{
+ struct rb_node *parent = NULL, **p = &app->mad.rb_node;
+ struct mrp_attr *attr;
+ int d;
+
+ while (*p) {
+ parent = *p;
+ attr = rb_entry(parent, struct mrp_attr, node);
+ d = mrp_attr_cmp(attr, value, len, type);
+ if (d > 0)
+ p = &parent->rb_left;
+ else if (d < 0)
+ p = &parent->rb_right;
+ else {
+ /* The attribute already exists; re-use it. */
+ return attr;
+ }
+ }
+ attr = kmalloc(sizeof(*attr) + len, GFP_ATOMIC);
+ if (!attr)
+ return attr;
+ attr->state = MRP_APPLICANT_VO;
+ attr->type = type;
+ attr->len = len;
+ memcpy(attr->value, value, len);
+
+ rb_link_node(&attr->node, parent, p);
+ rb_insert_color(&attr->node, &app->mad);
+ return attr;
+}
+
+static void mrp_attr_destroy(struct mrp_applicant *app, struct mrp_attr *attr)
+{
+ rb_erase(&attr->node, &app->mad);
+ kfree(attr);
+}
+
+static int mrp_pdu_init(struct mrp_applicant *app)
+{
+ struct sk_buff *skb;
+ struct mrp_pdu_hdr *ph;
+
+ skb = alloc_skb(app->dev->mtu + LL_RESERVED_SPACE(app->dev),
+ GFP_ATOMIC);
+ if (!skb)
+ return -ENOMEM;
+
+ skb->dev = app->dev;
+ skb->protocol = app->app->pkttype.type;
+ skb_reserve(skb, LL_RESERVED_SPACE(app->dev));
+ skb_reset_network_header(skb);
+ skb_reset_transport_header(skb);
+
+ ph = __skb_put(skb, sizeof(*ph));
+ ph->version = app->app->version;
+
+ app->pdu = skb;
+ return 0;
+}
+
+static int mrp_pdu_append_end_mark(struct mrp_applicant *app)
+{
+ __be16 *endmark;
+
+ if (skb_tailroom(app->pdu) < sizeof(*endmark))
+ return -1;
+ endmark = __skb_put(app->pdu, sizeof(*endmark));
+ put_unaligned(MRP_END_MARK, endmark);
+ return 0;
+}
+
+static void mrp_pdu_queue(struct mrp_applicant *app)
+{
+ if (!app->pdu)
+ return;
+
+ if (mrp_cb(app->pdu)->mh)
+ mrp_pdu_append_end_mark(app);
+ mrp_pdu_append_end_mark(app);
+
+ dev_hard_header(app->pdu, app->dev, ntohs(app->app->pkttype.type),
+ app->app->group_address, app->dev->dev_addr,
+ app->pdu->len);
+
+ skb_queue_tail(&app->queue, app->pdu);
+ app->pdu = NULL;
+}
+
+static void mrp_queue_xmit(struct mrp_applicant *app)
+{
+ struct sk_buff *skb;
+
+ while ((skb = skb_dequeue(&app->queue)))
+ dev_queue_xmit(skb);
+}
+
+static int mrp_pdu_append_msg_hdr(struct mrp_applicant *app,
+ u8 attrtype, u8 attrlen)
+{
+ struct mrp_msg_hdr *mh;
+
+ if (mrp_cb(app->pdu)->mh) {
+ if (mrp_pdu_append_end_mark(app) < 0)
+ return -1;
+ mrp_cb(app->pdu)->mh = NULL;
+ mrp_cb(app->pdu)->vah = NULL;
+ }
+
+ if (skb_tailroom(app->pdu) < sizeof(*mh))
+ return -1;
+ mh = __skb_put(app->pdu, sizeof(*mh));
+ mh->attrtype = attrtype;
+ mh->attrlen = attrlen;
+ mrp_cb(app->pdu)->mh = mh;
+ return 0;
+}
+
+static int mrp_pdu_append_vecattr_hdr(struct mrp_applicant *app,
+ const void *firstattrvalue, u8 attrlen)
+{
+ struct mrp_vecattr_hdr *vah;
+
+ if (skb_tailroom(app->pdu) < sizeof(*vah) + attrlen)
+ return -1;
+ vah = __skb_put(app->pdu, sizeof(*vah) + attrlen);
+ put_unaligned(0, &vah->lenflags);
+ memcpy(vah->firstattrvalue, firstattrvalue, attrlen);
+ mrp_cb(app->pdu)->vah = vah;
+ memcpy(mrp_cb(app->pdu)->attrvalue, firstattrvalue, attrlen);
+ return 0;
+}
+
+static int mrp_pdu_append_vecattr_event(struct mrp_applicant *app,
+ const struct mrp_attr *attr,
+ enum mrp_vecattr_event vaevent)
+{
+ u16 len, pos;
+ u8 *vaevents;
+ int err;
+again:
+ if (!app->pdu) {
+ err = mrp_pdu_init(app);
+ if (err < 0)
+ return err;
+ }
+
+ /* If there is no Message header in the PDU, or the Message header is
+ * for a different attribute type, add an EndMark (if necessary) and a
+ * new Message header to the PDU.
+ */
+ if (!mrp_cb(app->pdu)->mh ||
+ mrp_cb(app->pdu)->mh->attrtype != attr->type ||
+ mrp_cb(app->pdu)->mh->attrlen != attr->len) {
+ if (mrp_pdu_append_msg_hdr(app, attr->type, attr->len) < 0)
+ goto queue;
+ }
+
+ /* If there is no VectorAttribute header for this Message in the PDU,
+ * or this attribute's value does not sequentially follow the previous
+ * attribute's value, add a new VectorAttribute header to the PDU.
+ */
+ if (!mrp_cb(app->pdu)->vah ||
+ memcmp(mrp_cb(app->pdu)->attrvalue, attr->value, attr->len)) {
+ if (mrp_pdu_append_vecattr_hdr(app, attr->value, attr->len) < 0)
+ goto queue;
+ }
+
+ len = be16_to_cpu(get_unaligned(&mrp_cb(app->pdu)->vah->lenflags));
+ pos = len % 3;
+
+ /* Events are packed into Vectors in the PDU, three to a byte. Add a
+ * byte to the end of the Vector if necessary.
+ */
+ if (!pos) {
+ if (skb_tailroom(app->pdu) < sizeof(u8))
+ goto queue;
+ vaevents = __skb_put(app->pdu, sizeof(u8));
+ } else {
+ vaevents = (u8 *)(skb_tail_pointer(app->pdu) - sizeof(u8));
+ }
+
+ switch (pos) {
+ case 0:
+ *vaevents = vaevent * (__MRP_VECATTR_EVENT_MAX *
+ __MRP_VECATTR_EVENT_MAX);
+ break;
+ case 1:
+ *vaevents += vaevent * __MRP_VECATTR_EVENT_MAX;
+ break;
+ case 2:
+ *vaevents += vaevent;
+ break;
+ default:
+ WARN_ON(1);
+ }
+
+ /* Increment the length of the VectorAttribute in the PDU, as well as
+ * the value of the next attribute that would continue its Vector.
+ */
+ put_unaligned(cpu_to_be16(++len), &mrp_cb(app->pdu)->vah->lenflags);
+ mrp_attrvalue_inc(mrp_cb(app->pdu)->attrvalue, attr->len);
+
+ return 0;
+
+queue:
+ mrp_pdu_queue(app);
+ goto again;
+}
+
+static void mrp_attr_event(struct mrp_applicant *app,
+ struct mrp_attr *attr, enum mrp_event event)
+{
+ enum mrp_applicant_state state;
+
+ state = mrp_applicant_state_table[attr->state][event];
+ if (state == MRP_APPLICANT_INVALID) {
+ WARN_ON(1);
+ return;
+ }
+
+ if (event == MRP_EVENT_TX) {
+ /* When appending the attribute fails, don't update its state
+ * in order to retry at the next TX event.
+ */
+
+ switch (mrp_tx_action_table[attr->state]) {
+ case MRP_TX_ACTION_NONE:
+ case MRP_TX_ACTION_S_JOIN_IN_OPTIONAL:
+ case MRP_TX_ACTION_S_IN_OPTIONAL:
+ break;
+ case MRP_TX_ACTION_S_NEW:
+ if (mrp_pdu_append_vecattr_event(
+ app, attr, MRP_VECATTR_EVENT_NEW) < 0)
+ return;
+ break;
+ case MRP_TX_ACTION_S_JOIN_IN:
+ if (mrp_pdu_append_vecattr_event(
+ app, attr, MRP_VECATTR_EVENT_JOIN_IN) < 0)
+ return;
+ break;
+ case MRP_TX_ACTION_S_LV:
+ if (mrp_pdu_append_vecattr_event(
+ app, attr, MRP_VECATTR_EVENT_LV) < 0)
+ return;
+ /* As a pure applicant, sending a leave message
+ * implies that the attribute was unregistered and
+ * can be destroyed.
+ */
+ mrp_attr_destroy(app, attr);
+ return;
+ default:
+ WARN_ON(1);
+ }
+ }
+
+ attr->state = state;
+}
+
+int mrp_request_join(const struct net_device *dev,
+ const struct mrp_application *appl,
+ const void *value, u8 len, u8 type)
+{
+ struct mrp_port *port = rtnl_dereference(dev->mrp_port);
+ struct mrp_applicant *app = rtnl_dereference(
+ port->applicants[appl->type]);
+ struct mrp_attr *attr;
+
+ if (sizeof(struct mrp_skb_cb) + len >
+ FIELD_SIZEOF(struct sk_buff, cb))
+ return -ENOMEM;
+
+ spin_lock_bh(&app->lock);
+ attr = mrp_attr_create(app, value, len, type);
+ if (!attr) {
+ spin_unlock_bh(&app->lock);
+ return -ENOMEM;
+ }
+ mrp_attr_event(app, attr, MRP_EVENT_JOIN);
+ spin_unlock_bh(&app->lock);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mrp_request_join);
+
+void mrp_request_leave(const struct net_device *dev,
+ const struct mrp_application *appl,
+ const void *value, u8 len, u8 type)
+{
+ struct mrp_port *port = rtnl_dereference(dev->mrp_port);
+ struct mrp_applicant *app = rtnl_dereference(
+ port->applicants[appl->type]);
+ struct mrp_attr *attr;
+
+ if (sizeof(struct mrp_skb_cb) + len >
+ FIELD_SIZEOF(struct sk_buff, cb))
+ return;
+
+ spin_lock_bh(&app->lock);
+ attr = mrp_attr_lookup(app, value, len, type);
+ if (!attr) {
+ spin_unlock_bh(&app->lock);
+ return;
+ }
+ mrp_attr_event(app, attr, MRP_EVENT_LV);
+ spin_unlock_bh(&app->lock);
+}
+EXPORT_SYMBOL_GPL(mrp_request_leave);
+
+static void mrp_mad_event(struct mrp_applicant *app, enum mrp_event event)
+{
+ struct rb_node *node, *next;
+ struct mrp_attr *attr;
+
+ for (node = rb_first(&app->mad);
+ next = node ? rb_next(node) : NULL, node != NULL;
+ node = next) {
+ attr = rb_entry(node, struct mrp_attr, node);
+ mrp_attr_event(app, attr, event);
+ }
+}
+
+static void mrp_join_timer_arm(struct mrp_applicant *app)
+{
+ unsigned long delay;
+
+ delay = (u64)msecs_to_jiffies(mrp_join_time) * prandom_u32() >> 32;
+ mod_timer(&app->join_timer, jiffies + delay);
+}
+
+static void mrp_join_timer(struct timer_list *t)
+{
+ struct mrp_applicant *app = from_timer(app, t, join_timer);
+
+ spin_lock(&app->lock);
+ mrp_mad_event(app, MRP_EVENT_TX);
+ mrp_pdu_queue(app);
+ spin_unlock(&app->lock);
+
+ mrp_queue_xmit(app);
+ mrp_join_timer_arm(app);
+}
+
+static void mrp_periodic_timer_arm(struct mrp_applicant *app)
+{
+ mod_timer(&app->periodic_timer,
+ jiffies + msecs_to_jiffies(mrp_periodic_time));
+}
+
+static void mrp_periodic_timer(struct timer_list *t)
+{
+ struct mrp_applicant *app = from_timer(app, t, periodic_timer);
+
+ spin_lock(&app->lock);
+ mrp_mad_event(app, MRP_EVENT_PERIODIC);
+ mrp_pdu_queue(app);
+ spin_unlock(&app->lock);
+
+ mrp_periodic_timer_arm(app);
+}
+
+static int mrp_pdu_parse_end_mark(struct sk_buff *skb, int *offset)
+{
+ __be16 endmark;
+
+ if (skb_copy_bits(skb, *offset, &endmark, sizeof(endmark)) < 0)
+ return -1;
+ if (endmark == MRP_END_MARK) {
+ *offset += sizeof(endmark);
+ return -1;
+ }
+ return 0;
+}
+
+static void mrp_pdu_parse_vecattr_event(struct mrp_applicant *app,
+ struct sk_buff *skb,
+ enum mrp_vecattr_event vaevent)
+{
+ struct mrp_attr *attr;
+ enum mrp_event event;
+
+ attr = mrp_attr_lookup(app, mrp_cb(skb)->attrvalue,
+ mrp_cb(skb)->mh->attrlen,
+ mrp_cb(skb)->mh->attrtype);
+ if (attr == NULL)
+ return;
+
+ switch (vaevent) {
+ case MRP_VECATTR_EVENT_NEW:
+ event = MRP_EVENT_R_NEW;
+ break;
+ case MRP_VECATTR_EVENT_JOIN_IN:
+ event = MRP_EVENT_R_JOIN_IN;
+ break;
+ case MRP_VECATTR_EVENT_IN:
+ event = MRP_EVENT_R_IN;
+ break;
+ case MRP_VECATTR_EVENT_JOIN_MT:
+ event = MRP_EVENT_R_JOIN_MT;
+ break;
+ case MRP_VECATTR_EVENT_MT:
+ event = MRP_EVENT_R_MT;
+ break;
+ case MRP_VECATTR_EVENT_LV:
+ event = MRP_EVENT_R_LV;
+ break;
+ default:
+ return;
+ }
+
+ mrp_attr_event(app, attr, event);
+}
+
+static int mrp_pdu_parse_vecattr(struct mrp_applicant *app,
+ struct sk_buff *skb, int *offset)
+{
+ struct mrp_vecattr_hdr _vah;
+ u16 valen;
+ u8 vaevents, vaevent;
+
+ mrp_cb(skb)->vah = skb_header_pointer(skb, *offset, sizeof(_vah),
+ &_vah);
+ if (!mrp_cb(skb)->vah)
+ return -1;
+ *offset += sizeof(_vah);
+
+ if (get_unaligned(&mrp_cb(skb)->vah->lenflags) &
+ MRP_VECATTR_HDR_FLAG_LA)
+ mrp_mad_event(app, MRP_EVENT_R_LA);
+ valen = be16_to_cpu(get_unaligned(&mrp_cb(skb)->vah->lenflags) &
+ MRP_VECATTR_HDR_LEN_MASK);
+
+ /* The VectorAttribute structure in a PDU carries event information
+ * about one or more attributes having consecutive values. Only the
+ * value for the first attribute is contained in the structure. So
+ * we make a copy of that value, and then increment it each time we
+ * advance to the next event in its Vector.
+ */
+ if (sizeof(struct mrp_skb_cb) + mrp_cb(skb)->mh->attrlen >
+ FIELD_SIZEOF(struct sk_buff, cb))
+ return -1;
+ if (skb_copy_bits(skb, *offset, mrp_cb(skb)->attrvalue,
+ mrp_cb(skb)->mh->attrlen) < 0)
+ return -1;
+ *offset += mrp_cb(skb)->mh->attrlen;
+
+ /* In a VectorAttribute, the Vector contains events which are packed
+ * three to a byte. We process one byte of the Vector at a time.
+ */
+ while (valen > 0) {
+ if (skb_copy_bits(skb, *offset, &vaevents,
+ sizeof(vaevents)) < 0)
+ return -1;
+ *offset += sizeof(vaevents);
+
+ /* Extract and process the first event. */
+ vaevent = vaevents / (__MRP_VECATTR_EVENT_MAX *
+ __MRP_VECATTR_EVENT_MAX);
+ if (vaevent >= __MRP_VECATTR_EVENT_MAX) {
+ /* The byte is malformed; stop processing. */
+ return -1;
+ }
+ mrp_pdu_parse_vecattr_event(app, skb, vaevent);
+
+ /* If present, extract and process the second event. */
+ if (!--valen)
+ break;
+ mrp_attrvalue_inc(mrp_cb(skb)->attrvalue,
+ mrp_cb(skb)->mh->attrlen);
+ vaevents %= (__MRP_VECATTR_EVENT_MAX *
+ __MRP_VECATTR_EVENT_MAX);
+ vaevent = vaevents / __MRP_VECATTR_EVENT_MAX;
+ mrp_pdu_parse_vecattr_event(app, skb, vaevent);
+
+ /* If present, extract and process the third event. */
+ if (!--valen)
+ break;
+ mrp_attrvalue_inc(mrp_cb(skb)->attrvalue,
+ mrp_cb(skb)->mh->attrlen);
+ vaevents %= __MRP_VECATTR_EVENT_MAX;
+ vaevent = vaevents;
+ mrp_pdu_parse_vecattr_event(app, skb, vaevent);
+ }
+ return 0;
+}
+
+static int mrp_pdu_parse_msg(struct mrp_applicant *app, struct sk_buff *skb,
+ int *offset)
+{
+ struct mrp_msg_hdr _mh;
+
+ mrp_cb(skb)->mh = skb_header_pointer(skb, *offset, sizeof(_mh), &_mh);
+ if (!mrp_cb(skb)->mh)
+ return -1;
+ *offset += sizeof(_mh);
+
+ if (mrp_cb(skb)->mh->attrtype == 0 ||
+ mrp_cb(skb)->mh->attrtype > app->app->maxattr ||
+ mrp_cb(skb)->mh->attrlen == 0)
+ return -1;
+
+ while (skb->len > *offset) {
+ if (mrp_pdu_parse_end_mark(skb, offset) < 0)
+ break;
+ if (mrp_pdu_parse_vecattr(app, skb, offset) < 0)
+ return -1;
+ }
+ return 0;
+}
+
+static int mrp_rcv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *pt, struct net_device *orig_dev)
+{
+ struct mrp_application *appl = container_of(pt, struct mrp_application,
+ pkttype);
+ struct mrp_port *port;
+ struct mrp_applicant *app;
+ struct mrp_pdu_hdr _ph;
+ const struct mrp_pdu_hdr *ph;
+ int offset = skb_network_offset(skb);
+
+ /* If the interface is in promiscuous mode, drop the packet if
+ * it was unicast to another host.
+ */
+ if (unlikely(skb->pkt_type == PACKET_OTHERHOST))
+ goto out;
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (unlikely(!skb))
+ goto out;
+ port = rcu_dereference(dev->mrp_port);
+ if (unlikely(!port))
+ goto out;
+ app = rcu_dereference(port->applicants[appl->type]);
+ if (unlikely(!app))
+ goto out;
+
+ ph = skb_header_pointer(skb, offset, sizeof(_ph), &_ph);
+ if (!ph)
+ goto out;
+ offset += sizeof(_ph);
+
+ if (ph->version != app->app->version)
+ goto out;
+
+ spin_lock(&app->lock);
+ while (skb->len > offset) {
+ if (mrp_pdu_parse_end_mark(skb, &offset) < 0)
+ break;
+ if (mrp_pdu_parse_msg(app, skb, &offset) < 0)
+ break;
+ }
+ spin_unlock(&app->lock);
+out:
+ kfree_skb(skb);
+ return 0;
+}
+
+static int mrp_init_port(struct net_device *dev)
+{
+ struct mrp_port *port;
+
+ port = kzalloc(sizeof(*port), GFP_KERNEL);
+ if (!port)
+ return -ENOMEM;
+ rcu_assign_pointer(dev->mrp_port, port);
+ return 0;
+}
+
+static void mrp_release_port(struct net_device *dev)
+{
+ struct mrp_port *port = rtnl_dereference(dev->mrp_port);
+ unsigned int i;
+
+ for (i = 0; i <= MRP_APPLICATION_MAX; i++) {
+ if (rtnl_dereference(port->applicants[i]))
+ return;
+ }
+ RCU_INIT_POINTER(dev->mrp_port, NULL);
+ kfree_rcu(port, rcu);
+}
+
+int mrp_init_applicant(struct net_device *dev, struct mrp_application *appl)
+{
+ struct mrp_applicant *app;
+ int err;
+
+ ASSERT_RTNL();
+
+ if (!rtnl_dereference(dev->mrp_port)) {
+ err = mrp_init_port(dev);
+ if (err < 0)
+ goto err1;
+ }
+
+ err = -ENOMEM;
+ app = kzalloc(sizeof(*app), GFP_KERNEL);
+ if (!app)
+ goto err2;
+
+ err = dev_mc_add(dev, appl->group_address);
+ if (err < 0)
+ goto err3;
+
+ app->dev = dev;
+ app->app = appl;
+ app->mad = RB_ROOT;
+ spin_lock_init(&app->lock);
+ skb_queue_head_init(&app->queue);
+ rcu_assign_pointer(dev->mrp_port->applicants[appl->type], app);
+ timer_setup(&app->join_timer, mrp_join_timer, 0);
+ mrp_join_timer_arm(app);
+ timer_setup(&app->periodic_timer, mrp_periodic_timer, 0);
+ mrp_periodic_timer_arm(app);
+ return 0;
+
+err3:
+ kfree(app);
+err2:
+ mrp_release_port(dev);
+err1:
+ return err;
+}
+EXPORT_SYMBOL_GPL(mrp_init_applicant);
+
+void mrp_uninit_applicant(struct net_device *dev, struct mrp_application *appl)
+{
+ struct mrp_port *port = rtnl_dereference(dev->mrp_port);
+ struct mrp_applicant *app = rtnl_dereference(
+ port->applicants[appl->type]);
+
+ ASSERT_RTNL();
+
+ RCU_INIT_POINTER(port->applicants[appl->type], NULL);
+
+ /* Delete timer and generate a final TX event to flush out
+ * all pending messages before the applicant is gone.
+ */
+ del_timer_sync(&app->join_timer);
+ del_timer_sync(&app->periodic_timer);
+
+ spin_lock_bh(&app->lock);
+ mrp_mad_event(app, MRP_EVENT_TX);
+ mrp_pdu_queue(app);
+ spin_unlock_bh(&app->lock);
+
+ mrp_queue_xmit(app);
+
+ dev_mc_del(dev, appl->group_address);
+ kfree_rcu(app, rcu);
+ mrp_release_port(dev);
+}
+EXPORT_SYMBOL_GPL(mrp_uninit_applicant);
+
+int mrp_register_application(struct mrp_application *appl)
+{
+ appl->pkttype.func = mrp_rcv;
+ dev_add_pack(&appl->pkttype);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mrp_register_application);
+
+void mrp_unregister_application(struct mrp_application *appl)
+{
+ dev_remove_pack(&appl->pkttype);
+}
+EXPORT_SYMBOL_GPL(mrp_unregister_application);
diff --git a/net/802/p8022.c b/net/802/p8022.c
new file mode 100644
index 0000000..0bda8de
--- /dev/null
+++ b/net/802/p8022.c
@@ -0,0 +1,66 @@
+/*
+ * NET3: Support for 802.2 demultiplexing off Ethernet
+ * 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.
+ *
+ * Demultiplex 802.2 encoded protocols. We match the entry by the
+ * SSAP/DSAP pair and then deliver to the registered datalink that
+ * matches. The control byte is ignored and handling of such items
+ * is up to the routine passed the frame.
+ *
+ * Unlike the 802.3 datalink we have a list of 802.2 entries as
+ * there are multiple protocols to demux. The list is currently
+ * short (3 or 4 entries at most). The current demux assumes this.
+ */
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <net/datalink.h>
+#include <linux/mm.h>
+#include <linux/in.h>
+#include <linux/init.h>
+#include <net/llc.h>
+#include <net/p8022.h>
+
+static int p8022_request(struct datalink_proto *dl, struct sk_buff *skb,
+ unsigned char *dest)
+{
+ llc_build_and_send_ui_pkt(dl->sap, skb, dest, dl->sap->laddr.lsap);
+ return 0;
+}
+
+struct datalink_proto *register_8022_client(unsigned char type,
+ int (*func)(struct sk_buff *skb,
+ struct net_device *dev,
+ struct packet_type *pt,
+ struct net_device *orig_dev))
+{
+ struct datalink_proto *proto;
+
+ proto = kmalloc(sizeof(*proto), GFP_ATOMIC);
+ if (proto) {
+ proto->type[0] = type;
+ proto->header_length = 3;
+ proto->request = p8022_request;
+ proto->sap = llc_sap_open(type, func);
+ if (!proto->sap) {
+ kfree(proto);
+ proto = NULL;
+ }
+ }
+ return proto;
+}
+
+void unregister_8022_client(struct datalink_proto *proto)
+{
+ llc_sap_put(proto->sap);
+ kfree(proto);
+}
+
+EXPORT_SYMBOL(register_8022_client);
+EXPORT_SYMBOL(unregister_8022_client);
+
+MODULE_LICENSE("GPL");
diff --git a/net/802/p8023.c b/net/802/p8023.c
new file mode 100644
index 0000000..1256a40
--- /dev/null
+++ b/net/802/p8023.c
@@ -0,0 +1,64 @@
+/*
+ * NET3: 802.3 data link hooks used for IPX 802.3
+ *
+ * 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.
+ *
+ * 802.3 isn't really a protocol data link layer. Some old IPX stuff
+ * uses it however. Note that there is only one 802.3 protocol layer
+ * in the system. We don't currently support different protocols
+ * running raw 802.3 on different devices. Thankfully nobody else
+ * has done anything like the old IPX.
+ */
+
+#include <linux/in.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+
+#include <net/datalink.h>
+#include <net/p8022.h>
+
+/*
+ * Place an 802.3 header on a packet. The driver will do the mac
+ * addresses, we just need to give it the buffer length.
+ */
+static int p8023_request(struct datalink_proto *dl,
+ struct sk_buff *skb, unsigned char *dest_node)
+{
+ struct net_device *dev = skb->dev;
+
+ dev_hard_header(skb, dev, ETH_P_802_3, dest_node, NULL, skb->len);
+ return dev_queue_xmit(skb);
+}
+
+/*
+ * Create an 802.3 client. Note there can be only one 802.3 client
+ */
+struct datalink_proto *make_8023_client(void)
+{
+ struct datalink_proto *proto = kmalloc(sizeof(*proto), GFP_ATOMIC);
+
+ if (proto) {
+ proto->header_length = 0;
+ proto->request = p8023_request;
+ }
+ return proto;
+}
+
+/*
+ * Destroy the 802.3 client.
+ */
+void destroy_8023_client(struct datalink_proto *dl)
+{
+ kfree(dl);
+}
+
+EXPORT_SYMBOL(destroy_8023_client);
+EXPORT_SYMBOL(make_8023_client);
+
+MODULE_LICENSE("GPL");
diff --git a/net/802/psnap.c b/net/802/psnap.c
new file mode 100644
index 0000000..db6baf7
--- /dev/null
+++ b/net/802/psnap.c
@@ -0,0 +1,167 @@
+/*
+ * SNAP data link layer. Derived from 802.2
+ *
+ * Alan Cox <alan@lxorguk.ukuu.org.uk>,
+ * from the 802.2 layer by Greg Page.
+ * Merged in additions from Greg Page's psnap.c.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <net/datalink.h>
+#include <net/llc.h>
+#include <net/psnap.h>
+#include <linux/mm.h>
+#include <linux/in.h>
+#include <linux/init.h>
+#include <linux/rculist.h>
+
+static LIST_HEAD(snap_list);
+static DEFINE_SPINLOCK(snap_lock);
+static struct llc_sap *snap_sap;
+
+/*
+ * Find a snap client by matching the 5 bytes.
+ */
+static struct datalink_proto *find_snap_client(const unsigned char *desc)
+{
+ struct datalink_proto *proto = NULL, *p;
+
+ list_for_each_entry_rcu(p, &snap_list, node) {
+ if (!memcmp(p->type, desc, 5)) {
+ proto = p;
+ break;
+ }
+ }
+ return proto;
+}
+
+/*
+ * A SNAP packet has arrived
+ */
+static int snap_rcv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *pt, struct net_device *orig_dev)
+{
+ int rc = 1;
+ struct datalink_proto *proto;
+ static struct packet_type snap_packet_type = {
+ .type = cpu_to_be16(ETH_P_SNAP),
+ };
+
+ if (unlikely(!pskb_may_pull(skb, 5)))
+ goto drop;
+
+ rcu_read_lock();
+ proto = find_snap_client(skb_transport_header(skb));
+ if (proto) {
+ /* Pass the frame on. */
+ skb->transport_header += 5;
+ skb_pull_rcsum(skb, 5);
+ rc = proto->rcvfunc(skb, dev, &snap_packet_type, orig_dev);
+ }
+ rcu_read_unlock();
+
+ if (unlikely(!proto))
+ goto drop;
+
+out:
+ return rc;
+
+drop:
+ kfree_skb(skb);
+ goto out;
+}
+
+/*
+ * Put a SNAP header on a frame and pass to 802.2
+ */
+static int snap_request(struct datalink_proto *dl,
+ struct sk_buff *skb, u8 *dest)
+{
+ memcpy(skb_push(skb, 5), dl->type, 5);
+ llc_build_and_send_ui_pkt(snap_sap, skb, dest, snap_sap->laddr.lsap);
+ return 0;
+}
+
+/*
+ * Set up the SNAP layer
+ */
+EXPORT_SYMBOL(register_snap_client);
+EXPORT_SYMBOL(unregister_snap_client);
+
+static const char snap_err_msg[] __initconst =
+ KERN_CRIT "SNAP - unable to register with 802.2\n";
+
+static int __init snap_init(void)
+{
+ snap_sap = llc_sap_open(0xAA, snap_rcv);
+ if (!snap_sap) {
+ printk(snap_err_msg);
+ return -EBUSY;
+ }
+
+ return 0;
+}
+
+module_init(snap_init);
+
+static void __exit snap_exit(void)
+{
+ llc_sap_put(snap_sap);
+}
+
+module_exit(snap_exit);
+
+
+/*
+ * Register SNAP clients. We don't yet use this for IP.
+ */
+struct datalink_proto *register_snap_client(const unsigned char *desc,
+ int (*rcvfunc)(struct sk_buff *,
+ struct net_device *,
+ struct packet_type *,
+ struct net_device *))
+{
+ struct datalink_proto *proto = NULL;
+
+ spin_lock_bh(&snap_lock);
+
+ if (find_snap_client(desc))
+ goto out;
+
+ proto = kmalloc(sizeof(*proto), GFP_ATOMIC);
+ if (proto) {
+ memcpy(proto->type, desc, 5);
+ proto->rcvfunc = rcvfunc;
+ proto->header_length = 5 + 3; /* snap + 802.2 */
+ proto->request = snap_request;
+ list_add_rcu(&proto->node, &snap_list);
+ }
+out:
+ spin_unlock_bh(&snap_lock);
+
+ return proto;
+}
+
+/*
+ * Unregister SNAP clients. Protocols no longer want to play with us ...
+ */
+void unregister_snap_client(struct datalink_proto *proto)
+{
+ spin_lock_bh(&snap_lock);
+ list_del_rcu(&proto->node);
+ spin_unlock_bh(&snap_lock);
+
+ synchronize_net();
+
+ kfree(proto);
+}
+
+MODULE_LICENSE("GPL");
diff --git a/net/802/stp.c b/net/802/stp.c
new file mode 100644
index 0000000..2c40ba0
--- /dev/null
+++ b/net/802/stp.c
@@ -0,0 +1,104 @@
+/*
+ * STP SAP demux
+ *
+ * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+#include <linux/mutex.h>
+#include <linux/skbuff.h>
+#include <linux/etherdevice.h>
+#include <linux/llc.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <net/llc.h>
+#include <net/llc_pdu.h>
+#include <net/stp.h>
+
+/* 01:80:c2:00:00:20 - 01:80:c2:00:00:2F */
+#define GARP_ADDR_MIN 0x20
+#define GARP_ADDR_MAX 0x2F
+#define GARP_ADDR_RANGE (GARP_ADDR_MAX - GARP_ADDR_MIN)
+
+static const struct stp_proto __rcu *garp_protos[GARP_ADDR_RANGE + 1] __read_mostly;
+static const struct stp_proto __rcu *stp_proto __read_mostly;
+
+static struct llc_sap *sap __read_mostly;
+static unsigned int sap_registered;
+static DEFINE_MUTEX(stp_proto_mutex);
+
+/* Called under rcu_read_lock from LLC */
+static int stp_pdu_rcv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *pt, struct net_device *orig_dev)
+{
+ const struct ethhdr *eh = eth_hdr(skb);
+ const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
+ const struct stp_proto *proto;
+
+ if (pdu->ssap != LLC_SAP_BSPAN ||
+ pdu->dsap != LLC_SAP_BSPAN ||
+ pdu->ctrl_1 != LLC_PDU_TYPE_U)
+ goto err;
+
+ if (eh->h_dest[5] >= GARP_ADDR_MIN && eh->h_dest[5] <= GARP_ADDR_MAX) {
+ proto = rcu_dereference(garp_protos[eh->h_dest[5] -
+ GARP_ADDR_MIN]);
+ if (proto &&
+ !ether_addr_equal(eh->h_dest, proto->group_address))
+ goto err;
+ } else
+ proto = rcu_dereference(stp_proto);
+
+ if (!proto)
+ goto err;
+
+ proto->rcv(proto, skb, dev);
+ return 0;
+
+err:
+ kfree_skb(skb);
+ return 0;
+}
+
+int stp_proto_register(const struct stp_proto *proto)
+{
+ int err = 0;
+
+ mutex_lock(&stp_proto_mutex);
+ if (sap_registered++ == 0) {
+ sap = llc_sap_open(LLC_SAP_BSPAN, stp_pdu_rcv);
+ if (!sap) {
+ err = -ENOMEM;
+ goto out;
+ }
+ }
+ if (is_zero_ether_addr(proto->group_address))
+ rcu_assign_pointer(stp_proto, proto);
+ else
+ rcu_assign_pointer(garp_protos[proto->group_address[5] -
+ GARP_ADDR_MIN], proto);
+out:
+ mutex_unlock(&stp_proto_mutex);
+ return err;
+}
+EXPORT_SYMBOL_GPL(stp_proto_register);
+
+void stp_proto_unregister(const struct stp_proto *proto)
+{
+ mutex_lock(&stp_proto_mutex);
+ if (is_zero_ether_addr(proto->group_address))
+ RCU_INIT_POINTER(stp_proto, NULL);
+ else
+ RCU_INIT_POINTER(garp_protos[proto->group_address[5] -
+ GARP_ADDR_MIN], NULL);
+ synchronize_rcu();
+
+ if (--sap_registered == 0)
+ llc_sap_put(sap);
+ mutex_unlock(&stp_proto_mutex);
+}
+EXPORT_SYMBOL_GPL(stp_proto_unregister);
+
+MODULE_LICENSE("GPL");