Creation of Cybook 2416 (actually Gen4) repository

net/bridge/Kconfig

@@ -0,0 +1,32 @@
+#
+# 802.1d Ethernet Bridging
+#
+
+config BRIDGE
+	tristate "802.1d Ethernet Bridging"
+	select LLC
+	---help---
+	  If you say Y here, then your Linux box will be able to act as an
+	  Ethernet bridge, which means that the different Ethernet segments it
+	  is connected to will appear as one Ethernet to the participants.
+	  Several such bridges can work together to create even larger
+	  networks of Ethernets using the IEEE 802.1 spanning tree algorithm.
+	  As this is a standard, Linux bridges will cooperate properly with
+	  other third party bridge products.
+
+	  In order to use the Ethernet bridge, you'll need the bridge
+	  configuration tools; see <file:Documentation/networking/bridge.txt>
+	  for location. Please read the Bridge mini-HOWTO for more
+	  information.
+
+	  If you enable iptables support along with the bridge support then you
+	  turn your bridge into a bridging IP firewall.
+	  iptables will then see the IP packets being bridged, so you need to
+	  take this into account when setting up your firewall rules.
+	  Enabling arptables support when bridging will let arptables see
+	  bridged ARP traffic in the arptables FORWARD chain.
+
+	  To compile this code as a module, choose M here: the module
+	  will be called bridge.
+
+	  If unsure, say N.

net/bridge/Makefile

@@ -0,0 +1,15 @@
+#
+# Makefile for the IEEE 802.1d ethernet bridging layer.
+#
+
+obj-$(CONFIG_BRIDGE) += bridge.o
+
+bridge-y	:= br.o br_device.o br_fdb.o br_forward.o br_if.o br_input.o \
+			br_ioctl.o br_notify.o br_stp.o br_stp_bpdu.o \
+			br_stp_if.o br_stp_timer.o br_netlink.o
+
+bridge-$(CONFIG_SYSFS) += br_sysfs_if.o br_sysfs_br.o
+
+bridge-$(CONFIG_BRIDGE_NETFILTER) += br_netfilter.o
+
+obj-$(CONFIG_BRIDGE_NF_EBTABLES) += netfilter/

net/bridge/br.c

@@ -0,0 +1,92 @@
+/*
+ *	Generic parts
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
+ *
+ *	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/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/init.h>
+#include <linux/llc.h>
+#include <net/llc.h>
+
+#include "br_private.h"
+
+int (*br_should_route_hook) (struct sk_buff **pskb) = NULL;
+
+static struct llc_sap *br_stp_sap;
+
+static int __init br_init(void)
+{
+	int err;
+
+	br_stp_sap = llc_sap_open(LLC_SAP_BSPAN, br_stp_rcv);
+	if (!br_stp_sap) {
+		printk(KERN_ERR "bridge: can't register sap for STP\n");
+		return -EADDRINUSE;
+	}
+
+	br_fdb_init();
+
+	err = br_netfilter_init();
+	if (err)
+		goto err_out1;
+
+	err = register_netdevice_notifier(&br_device_notifier);
+	if (err)
+		goto err_out2;
+
+	br_netlink_init();
+	brioctl_set(br_ioctl_deviceless_stub);
+	br_handle_frame_hook = br_handle_frame;
+
+	br_fdb_get_hook = br_fdb_get;
+	br_fdb_put_hook = br_fdb_put;
+
+	return 0;
+
+err_out2:
+	br_netfilter_fini();
+err_out1:
+	llc_sap_put(br_stp_sap);
+	return err;
+}
+
+static void __exit br_deinit(void)
+{
+	rcu_assign_pointer(br_stp_sap->rcv_func, NULL);
+
+	br_netlink_fini();
+	br_netfilter_fini();
+	unregister_netdevice_notifier(&br_device_notifier);
+	brioctl_set(NULL);
+
+	br_cleanup_bridges();
+
+	synchronize_net();
+
+	llc_sap_put(br_stp_sap);
+	br_fdb_get_hook = NULL;
+	br_fdb_put_hook = NULL;
+
+	br_handle_frame_hook = NULL;
+	br_fdb_fini();
+}
+
+EXPORT_SYMBOL(br_should_route_hook);
+
+module_init(br_init)
+module_exit(br_deinit)
+MODULE_LICENSE("GPL");
+MODULE_VERSION(BR_VERSION);

net/bridge/br_device.c

@@ -0,0 +1,189 @@
+/*
+ *	Device handling code
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_device.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
+ *
+ *	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/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+
+#include <asm/uaccess.h>
+#include "br_private.h"
+
+static struct net_device_stats *br_dev_get_stats(struct net_device *dev)
+{
+	struct net_bridge *br = netdev_priv(dev);
+	return &br->statistics;
+}
+
+/* net device transmit always called with no BH (preempt_disabled) */
+int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct net_bridge *br = netdev_priv(dev);
+	const unsigned char *dest = skb->data;
+	struct net_bridge_fdb_entry *dst;
+
+	br->statistics.tx_packets++;
+	br->statistics.tx_bytes += skb->len;
+
+	skb->mac.raw = skb->data;
+	skb_pull(skb, ETH_HLEN);
+
+	if (dest[0] & 1)
+		br_flood_deliver(br, skb, 0);
+	else if ((dst = __br_fdb_get(br, dest)) != NULL)
+		br_deliver(dst->dst, skb);
+	else
+		br_flood_deliver(br, skb, 0);
+
+	return 0;
+}
+
+static int br_dev_open(struct net_device *dev)
+{
+	struct net_bridge *br = netdev_priv(dev);
+
+	br_features_recompute(br);
+	netif_start_queue(dev);
+	br_stp_enable_bridge(br);
+
+	return 0;
+}
+
+static void br_dev_set_multicast_list(struct net_device *dev)
+{
+}
+
+static int br_dev_stop(struct net_device *dev)
+{
+	br_stp_disable_bridge(netdev_priv(dev));
+
+	netif_stop_queue(dev);
+
+	return 0;
+}
+
+static int br_change_mtu(struct net_device *dev, int new_mtu)
+{
+	if (new_mtu < 68 || new_mtu > br_min_mtu(netdev_priv(dev)))
+		return -EINVAL;
+
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+/* Allow setting mac address of pseudo-bridge to be same as
+ * any of the bound interfaces
+ */
+static int br_set_mac_address(struct net_device *dev, void *p)
+{
+	struct net_bridge *br = netdev_priv(dev);
+	struct sockaddr *addr = p;
+	struct net_bridge_port *port;
+	int err = -EADDRNOTAVAIL;
+
+	spin_lock_bh(&br->lock);
+	list_for_each_entry(port, &br->port_list, list) {
+		if (!compare_ether_addr(port->dev->dev_addr, addr->sa_data)) {
+			br_stp_change_bridge_id(br, addr->sa_data);
+			err = 0;
+			break;
+		}
+	}
+	spin_unlock_bh(&br->lock);
+
+	return err;
+}
+
+static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
+{
+	strcpy(info->driver, "bridge");
+	strcpy(info->version, BR_VERSION);
+	strcpy(info->fw_version, "N/A");
+	strcpy(info->bus_info, "N/A");
+}
+
+static int br_set_sg(struct net_device *dev, u32 data)
+{
+	struct net_bridge *br = netdev_priv(dev);
+
+	if (data)
+		br->feature_mask |= NETIF_F_SG;
+	else
+		br->feature_mask &= ~NETIF_F_SG;
+
+	br_features_recompute(br);
+	return 0;
+}
+
+static int br_set_tso(struct net_device *dev, u32 data)
+{
+	struct net_bridge *br = netdev_priv(dev);
+
+	if (data)
+		br->feature_mask |= NETIF_F_TSO;
+	else
+		br->feature_mask &= ~NETIF_F_TSO;
+
+	br_features_recompute(br);
+	return 0;
+}
+
+static int br_set_tx_csum(struct net_device *dev, u32 data)
+{
+	struct net_bridge *br = netdev_priv(dev);
+
+	if (data)
+		br->feature_mask |= NETIF_F_NO_CSUM;
+	else
+		br->feature_mask &= ~NETIF_F_ALL_CSUM;
+
+	br_features_recompute(br);
+	return 0;
+}
+
+static struct ethtool_ops br_ethtool_ops = {
+	.get_drvinfo = br_getinfo,
+	.get_link = ethtool_op_get_link,
+	.get_sg = ethtool_op_get_sg,
+	.set_sg = br_set_sg,
+	.get_tx_csum = ethtool_op_get_tx_csum,
+	.set_tx_csum = br_set_tx_csum,
+	.get_tso = ethtool_op_get_tso,
+	.set_tso = br_set_tso,
+};
+
+void br_dev_setup(struct net_device *dev)
+{
+	memset(dev->dev_addr, 0, ETH_ALEN);
+
+	ether_setup(dev);
+
+	dev->do_ioctl = br_dev_ioctl;
+	dev->get_stats = br_dev_get_stats;
+	dev->hard_start_xmit = br_dev_xmit;
+	dev->open = br_dev_open;
+	dev->set_multicast_list = br_dev_set_multicast_list;
+	dev->change_mtu = br_change_mtu;
+	dev->destructor = free_netdev;
+	SET_MODULE_OWNER(dev);
+	SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
+	dev->stop = br_dev_stop;
+	dev->tx_queue_len = 0;
+	dev->set_mac_address = br_set_mac_address;
+	dev->priv_flags = IFF_EBRIDGE;
+
+	dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
+			NETIF_F_TSO | NETIF_F_NO_CSUM | NETIF_F_GSO_ROBUST;
+}

net/bridge/br_fdb.c

@@ -0,0 +1,371 @@
+/*
+ *	Forwarding database
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_fdb.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
+ *
+ *	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/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/times.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/jhash.h>
+#include <asm/atomic.h>
+#include "br_private.h"
+
+static struct kmem_cache *br_fdb_cache __read_mostly;
+static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
+		      const unsigned char *addr);
+
+void __init br_fdb_init(void)
+{
+	br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
+					 sizeof(struct net_bridge_fdb_entry),
+					 0,
+					 SLAB_HWCACHE_ALIGN, NULL, NULL);
+}
+
+void __exit br_fdb_fini(void)
+{
+	kmem_cache_destroy(br_fdb_cache);
+}
+
+
+/* if topology_changing then use forward_delay (default 15 sec)
+ * otherwise keep longer (default 5 minutes)
+ */
+static __inline__ unsigned long hold_time(const struct net_bridge *br)
+{
+	return br->topology_change ? br->forward_delay : br->ageing_time;
+}
+
+static __inline__ int has_expired(const struct net_bridge *br,
+				  const struct net_bridge_fdb_entry *fdb)
+{
+	return !fdb->is_static
+		&& time_before_eq(fdb->ageing_timer + hold_time(br), jiffies);
+}
+
+static __inline__ int br_mac_hash(const unsigned char *mac)
+{
+	return jhash(mac, ETH_ALEN, 0) & (BR_HASH_SIZE - 1);
+}
+
+static __inline__ void fdb_delete(struct net_bridge_fdb_entry *f)
+{
+	hlist_del_rcu(&f->hlist);
+	br_fdb_put(f);
+}
+
+void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
+{
+	struct net_bridge *br = p->br;
+	int i;
+
+	spin_lock_bh(&br->hash_lock);
+
+	/* Search all chains since old address/hash is unknown */
+	for (i = 0; i < BR_HASH_SIZE; i++) {
+		struct hlist_node *h;
+		hlist_for_each(h, &br->hash[i]) {
+			struct net_bridge_fdb_entry *f;
+
+			f = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
+			if (f->dst == p && f->is_local) {
+				/* maybe another port has same hw addr? */
+				struct net_bridge_port *op;
+				list_for_each_entry(op, &br->port_list, list) {
+					if (op != p &&
+					    !compare_ether_addr(op->dev->dev_addr,
+								f->addr.addr)) {
+						f->dst = op;
+						goto insert;
+					}
+				}
+
+				/* delete old one */
+				fdb_delete(f);
+				goto insert;
+			}
+		}
+	}
+ insert:
+	/* insert new address,  may fail if invalid address or dup. */
+	fdb_insert(br, p, newaddr);
+
+	spin_unlock_bh(&br->hash_lock);
+}
+
+void br_fdb_cleanup(unsigned long _data)
+{
+	struct net_bridge *br = (struct net_bridge *)_data;
+	unsigned long delay = hold_time(br);
+	int i;
+
+	spin_lock_bh(&br->hash_lock);
+	for (i = 0; i < BR_HASH_SIZE; i++) {
+		struct net_bridge_fdb_entry *f;
+		struct hlist_node *h, *n;
+
+		hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
+			if (!f->is_static &&
+			    time_before_eq(f->ageing_timer + delay, jiffies))
+				fdb_delete(f);
+		}
+	}
+	spin_unlock_bh(&br->hash_lock);
+
+	mod_timer(&br->gc_timer, jiffies + HZ/10);
+}
+
+
+void br_fdb_delete_by_port(struct net_bridge *br,
+			   const struct net_bridge_port *p,
+			   int do_all)
+{
+	int i;
+
+	spin_lock_bh(&br->hash_lock);
+	for (i = 0; i < BR_HASH_SIZE; i++) {
+		struct hlist_node *h, *g;
+
+		hlist_for_each_safe(h, g, &br->hash[i]) {
+			struct net_bridge_fdb_entry *f
+				= hlist_entry(h, struct net_bridge_fdb_entry, hlist);
+			if (f->dst != p)
+				continue;
+
+			if (f->is_static && !do_all)
+				continue;
+			/*
+			 * if multiple ports all have the same device address
+			 * then when one port is deleted, assign
+			 * the local entry to other port
+			 */
+			if (f->is_local) {
+				struct net_bridge_port *op;
+				list_for_each_entry(op, &br->port_list, list) {
+					if (op != p &&
+					    !compare_ether_addr(op->dev->dev_addr,
+								f->addr.addr)) {
+						f->dst = op;
+						goto skip_delete;
+					}
+				}
+			}
+
+			fdb_delete(f);
+		skip_delete: ;
+		}
+	}
+	spin_unlock_bh(&br->hash_lock);
+}
+
+/* No locking or refcounting, assumes caller has no preempt (rcu_read_lock) */
+struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
+					  const unsigned char *addr)
+{
+	struct hlist_node *h;
+	struct net_bridge_fdb_entry *fdb;
+
+	hlist_for_each_entry_rcu(fdb, h, &br->hash[br_mac_hash(addr)], hlist) {
+		if (!compare_ether_addr(fdb->addr.addr, addr)) {
+			if (unlikely(has_expired(br, fdb)))
+				break;
+			return fdb;
+		}
+	}
+
+	return NULL;
+}
+
+/* Interface used by ATM hook that keeps a ref count */
+struct net_bridge_fdb_entry *br_fdb_get(struct net_bridge *br,
+					unsigned char *addr)
+{
+	struct net_bridge_fdb_entry *fdb;
+
+	rcu_read_lock();
+	fdb = __br_fdb_get(br, addr);
+	if (fdb && !atomic_inc_not_zero(&fdb->use_count))
+		fdb = NULL;
+	rcu_read_unlock();
+	return fdb;
+}
+
+static void fdb_rcu_free(struct rcu_head *head)
+{
+	struct net_bridge_fdb_entry *ent
+		= container_of(head, struct net_bridge_fdb_entry, rcu);
+	kmem_cache_free(br_fdb_cache, ent);
+}
+
+/* Set entry up for deletion with RCU  */
+void br_fdb_put(struct net_bridge_fdb_entry *ent)
+{
+	if (atomic_dec_and_test(&ent->use_count))
+		call_rcu(&ent->rcu, fdb_rcu_free);
+}
+
+/*
+ * Fill buffer with forwarding table records in
+ * the API format.
+ */
+int br_fdb_fillbuf(struct net_bridge *br, void *buf,
+		   unsigned long maxnum, unsigned long skip)
+{
+	struct __fdb_entry *fe = buf;
+	int i, num = 0;
+	struct hlist_node *h;
+	struct net_bridge_fdb_entry *f;
+
+	memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
+
+	rcu_read_lock();
+	for (i = 0; i < BR_HASH_SIZE; i++) {
+		hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
+			if (num >= maxnum)
+				goto out;
+
+			if (has_expired(br, f))
+				continue;
+
+			if (skip) {
+				--skip;
+				continue;
+			}
+
+			/* convert from internal format to API */
+			memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
+			fe->port_no = f->dst->port_no;
+			fe->is_local = f->is_local;
+			if (!f->is_static)
+				fe->ageing_timer_value = jiffies_to_clock_t(jiffies - f->ageing_timer);
+			++fe;
+			++num;
+		}
+	}
+
+ out:
+	rcu_read_unlock();
+
+	return num;
+}
+
+static inline struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
+						    const unsigned char *addr)
+{
+	struct hlist_node *h;
+	struct net_bridge_fdb_entry *fdb;
+
+	hlist_for_each_entry_rcu(fdb, h, head, hlist) {
+		if (!compare_ether_addr(fdb->addr.addr, addr))
+			return fdb;
+	}
+	return NULL;
+}
+
+static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
+					       struct net_bridge_port *source,
+					       const unsigned char *addr,
+					       int is_local)
+{
+	struct net_bridge_fdb_entry *fdb;
+
+	fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
+	if (fdb) {
+		memcpy(fdb->addr.addr, addr, ETH_ALEN);
+		atomic_set(&fdb->use_count, 1);
+		hlist_add_head_rcu(&fdb->hlist, head);
+
+		fdb->dst = source;
+		fdb->is_local = is_local;
+		fdb->is_static = is_local;
+		fdb->ageing_timer = jiffies;
+	}
+	return fdb;
+}
+
+static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
+		  const unsigned char *addr)
+{
+	struct hlist_head *head = &br->hash[br_mac_hash(addr)];
+	struct net_bridge_fdb_entry *fdb;
+
+	if (!is_valid_ether_addr(addr))
+		return -EINVAL;
+
+	fdb = fdb_find(head, addr);
+	if (fdb) {
+		/* it is okay to have multiple ports with same
+		 * address, just use the first one.
+		 */
+		if (fdb->is_local)
+			return 0;
+
+		printk(KERN_WARNING "%s adding interface with same address "
+		       "as a received packet\n",
+		       source->dev->name);
+		fdb_delete(fdb);
+	}
+
+	if (!fdb_create(head, source, addr, 1))
+		return -ENOMEM;
+
+	return 0;
+}
+
+int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
+		  const unsigned char *addr)
+{
+	int ret;
+
+	spin_lock_bh(&br->hash_lock);
+	ret = fdb_insert(br, source, addr);
+	spin_unlock_bh(&br->hash_lock);
+	return ret;
+}
+
+void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
+		   const unsigned char *addr)
+{
+	struct hlist_head *head = &br->hash[br_mac_hash(addr)];
+	struct net_bridge_fdb_entry *fdb;
+
+	/* some users want to always flood. */
+	if (hold_time(br) == 0)
+		return;
+
+	fdb = fdb_find(head, addr);
+	if (likely(fdb)) {
+		/* attempt to update an entry for a local interface */
+		if (unlikely(fdb->is_local)) {
+			if (net_ratelimit())
+				printk(KERN_WARNING "%s: received packet with "
+				       " own address as source address\n",
+				       source->dev->name);
+		} else {
+			/* fastpath: update of existing entry */
+			fdb->dst = source;
+			fdb->ageing_timer = jiffies;
+		}
+	} else {
+		spin_lock(&br->hash_lock);
+		if (!fdb_find(head, addr))
+			fdb_create(head, source, addr, 0);
+		/* else  we lose race and someone else inserts
+		 * it first, don't bother updating
+		 */
+		spin_unlock(&br->hash_lock);
+	}
+}

net/bridge/br_forward.c

@@ -0,0 +1,160 @@
+/*
+ *	Forwarding decision
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_forward.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
+ *
+ *	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/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/if_vlan.h>
+#include <linux/netfilter_bridge.h>
+#include "br_private.h"
+
+/* Don't forward packets to originating port or forwarding diasabled */
+static inline int should_deliver(const struct net_bridge_port *p,
+				 const struct sk_buff *skb)
+{
+	return (skb->dev != p->dev && p->state == BR_STATE_FORWARDING);
+}
+
+static inline unsigned packet_length(const struct sk_buff *skb)
+{
+	return skb->len - (skb->protocol == htons(ETH_P_8021Q) ? VLAN_HLEN : 0);
+}
+
+int br_dev_queue_push_xmit(struct sk_buff *skb)
+{
+	/* drop mtu oversized packets except gso */
+	if (packet_length(skb) > skb->dev->mtu && !skb_is_gso(skb))
+		kfree_skb(skb);
+	else {
+		/* ip_refrag calls ip_fragment, doesn't copy the MAC header. */
+		if (nf_bridge_maybe_copy_header(skb))
+			kfree_skb(skb);
+		else {
+			skb_push(skb, ETH_HLEN);
+
+			dev_queue_xmit(skb);
+		}
+	}
+
+	return 0;
+}
+
+int br_forward_finish(struct sk_buff *skb)
+{
+	return NF_HOOK(PF_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev,
+		       br_dev_queue_push_xmit);
+
+}
+
+static void __br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
+{
+	skb->dev = to->dev;
+	NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
+			br_forward_finish);
+}
+
+static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
+{
+	struct net_device *indev;
+
+	indev = skb->dev;
+	skb->dev = to->dev;
+	skb->ip_summed = CHECKSUM_NONE;
+
+	NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
+			br_forward_finish);
+}
+
+/* called with rcu_read_lock */
+void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
+{
+	if (should_deliver(to, skb)) {
+		__br_deliver(to, skb);
+		return;
+	}
+
+	kfree_skb(skb);
+}
+
+/* called with rcu_read_lock */
+void br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
+{
+	if (should_deliver(to, skb)) {
+		__br_forward(to, skb);
+		return;
+	}
+
+	kfree_skb(skb);
+}
+
+/* called under bridge lock */
+static void br_flood(struct net_bridge *br, struct sk_buff *skb, int clone,
+	void (*__packet_hook)(const struct net_bridge_port *p,
+			      struct sk_buff *skb))
+{
+	struct net_bridge_port *p;
+	struct net_bridge_port *prev;
+
+	if (clone) {
+		struct sk_buff *skb2;
+
+		if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) {
+			br->statistics.tx_dropped++;
+			return;
+		}
+
+		skb = skb2;
+	}
+
+	prev = NULL;
+
+	list_for_each_entry_rcu(p, &br->port_list, list) {
+		if (should_deliver(p, skb)) {
+			if (prev != NULL) {
+				struct sk_buff *skb2;
+
+				if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) {
+					br->statistics.tx_dropped++;
+					kfree_skb(skb);
+					return;
+				}
+
+				__packet_hook(prev, skb2);
+			}
+
+			prev = p;
+		}
+	}
+
+	if (prev != NULL) {
+		__packet_hook(prev, skb);
+		return;
+	}
+
+	kfree_skb(skb);
+}
+
+
+/* called with rcu_read_lock */
+void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, int clone)
+{
+	br_flood(br, skb, clone, __br_deliver);
+}
+
+/* called under bridge lock */
+void br_flood_forward(struct net_bridge *br, struct sk_buff *skb, int clone)
+{
+	br_flood(br, skb, clone, __br_forward);
+}

net/bridge/br_if.c

@@ -0,0 +1,481 @@
+/*
+ *	Userspace interface
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_if.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
+ *
+ *	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/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/ethtool.h>
+#include <linux/if_arp.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/rtnetlink.h>
+#include <linux/if_ether.h>
+#include <net/sock.h>
+
+#include "br_private.h"
+
+/*
+ * Determine initial path cost based on speed.
+ * using recommendations from 802.1d standard
+ *
+ * Need to simulate user ioctl because not all device's that support
+ * ethtool, use ethtool_ops.  Also, since driver might sleep need to
+ * not be holding any locks.
+ */
+static int port_cost(struct net_device *dev)
+{
+	struct ethtool_cmd ecmd = { ETHTOOL_GSET };
+	struct ifreq ifr;
+	mm_segment_t old_fs;
+	int err;
+
+	strncpy(ifr.ifr_name, dev->name, IFNAMSIZ);
+	ifr.ifr_data = (void __user *) &ecmd;
+
+	old_fs = get_fs();
+	set_fs(KERNEL_DS);
+	err = dev_ethtool(&ifr);
+	set_fs(old_fs);
+
+	if (!err) {
+		switch(ecmd.speed) {
+		case SPEED_100:
+			return 19;
+		case SPEED_1000:
+			return 4;
+		case SPEED_10000:
+			return 2;
+		case SPEED_10:
+			return 100;
+		}
+	}
+
+	/* Old silly heuristics based on name */
+	if (!strncmp(dev->name, "lec", 3))
+		return 7;
+
+	if (!strncmp(dev->name, "plip", 4))
+		return 2500;
+
+	return 100;	/* assume old 10Mbps */
+}
+
+
+/*
+ * Check for port carrier transistions.
+ * Called from work queue to allow for calling functions that
+ * might sleep (such as speed check), and to debounce.
+ */
+void br_port_carrier_check(struct net_bridge_port *p)
+{
+	struct net_device *dev = p->dev;
+	struct net_bridge *br = p->br;
+
+	if (netif_carrier_ok(dev))
+		p->path_cost = port_cost(dev);
+
+	if (netif_running(br->dev)) {
+		spin_lock_bh(&br->lock);
+		if (netif_carrier_ok(dev)) {
+			if (p->state == BR_STATE_DISABLED)
+				br_stp_enable_port(p);
+		} else {
+			if (p->state != BR_STATE_DISABLED)
+				br_stp_disable_port(p);
+		}
+		spin_unlock_bh(&br->lock);
+	}
+}
+
+static void release_nbp(struct kobject *kobj)
+{
+	struct net_bridge_port *p
+		= container_of(kobj, struct net_bridge_port, kobj);
+	kfree(p);
+}
+
+static struct kobj_type brport_ktype = {
+#ifdef CONFIG_SYSFS
+	.sysfs_ops = &brport_sysfs_ops,
+#endif
+	.release = release_nbp,
+};
+
+static void destroy_nbp(struct net_bridge_port *p)
+{
+	struct net_device *dev = p->dev;
+
+	p->br = NULL;
+	p->dev = NULL;
+	dev_put(dev);
+
+	kobject_put(&p->kobj);
+}
+
+static void destroy_nbp_rcu(struct rcu_head *head)
+{
+	struct net_bridge_port *p =
+			container_of(head, struct net_bridge_port, rcu);
+	destroy_nbp(p);
+}
+
+/* Delete port(interface) from bridge is done in two steps.
+ * via RCU. First step, marks device as down. That deletes
+ * all the timers and stops new packets from flowing through.
+ *
+ * Final cleanup doesn't occur until after all CPU's finished
+ * processing packets.
+ *
+ * Protected from multiple admin operations by RTNL mutex
+ */
+static void del_nbp(struct net_bridge_port *p)
+{
+	struct net_bridge *br = p->br;
+	struct net_device *dev = p->dev;
+
+	sysfs_remove_link(&br->ifobj, dev->name);
+
+	dev_set_promiscuity(dev, -1);
+
+	spin_lock_bh(&br->lock);
+	br_stp_disable_port(p);
+	spin_unlock_bh(&br->lock);
+
+	br_fdb_delete_by_port(br, p, 1);
+
+	list_del_rcu(&p->list);
+
+	rcu_assign_pointer(dev->br_port, NULL);
+
+	kobject_uevent(&p->kobj, KOBJ_REMOVE);
+	kobject_del(&p->kobj);
+
+	call_rcu(&p->rcu, destroy_nbp_rcu);
+}
+
+/* called with RTNL */
+static void del_br(struct net_bridge *br)
+{
+	struct net_bridge_port *p, *n;
+
+	list_for_each_entry_safe(p, n, &br->port_list, list) {
+		del_nbp(p);
+	}
+
+	del_timer_sync(&br->gc_timer);
+
+	br_sysfs_delbr(br->dev);
+	unregister_netdevice(br->dev);
+}
+
+static struct net_device *new_bridge_dev(const char *name)
+{
+	struct net_bridge *br;
+	struct net_device *dev;
+
+	dev = alloc_netdev(sizeof(struct net_bridge), name,
+			   br_dev_setup);
+
+	if (!dev)
+		return NULL;
+
+	br = netdev_priv(dev);
+	br->dev = dev;
+
+	spin_lock_init(&br->lock);
+	INIT_LIST_HEAD(&br->port_list);
+	spin_lock_init(&br->hash_lock);
+
+	br->bridge_id.prio[0] = 0x80;
+	br->bridge_id.prio[1] = 0x00;
+
+	memcpy(br->group_addr, br_group_address, ETH_ALEN);
+
+	br->feature_mask = dev->features;
+	br->stp_enabled = 0;
+	br->designated_root = br->bridge_id;
+	br->root_path_cost = 0;
+	br->root_port = 0;
+	br->bridge_max_age = br->max_age = 20 * HZ;
+	br->bridge_hello_time = br->hello_time = 2 * HZ;
+	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
+	br->topology_change = 0;
+	br->topology_change_detected = 0;
+	br->ageing_time = 300 * HZ;
+	INIT_LIST_HEAD(&br->age_list);
+
+	br_stp_timer_init(br);
+
+	return dev;
+}
+
+/* find an available port number */
+static int find_portno(struct net_bridge *br)
+{
+	int index;
+	struct net_bridge_port *p;
+	unsigned long *inuse;
+
+	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
+			GFP_KERNEL);
+	if (!inuse)
+		return -ENOMEM;
+
+	set_bit(0, inuse);	/* zero is reserved */
+	list_for_each_entry(p, &br->port_list, list) {
+		set_bit(p->port_no, inuse);
+	}
+	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
+	kfree(inuse);
+
+	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
+}
+
+/* called with RTNL but without bridge lock */
+static struct net_bridge_port *new_nbp(struct net_bridge *br,
+				       struct net_device *dev)
+{
+	int index;
+	struct net_bridge_port *p;
+
+	index = find_portno(br);
+	if (index < 0)
+		return ERR_PTR(index);
+
+	p = kzalloc(sizeof(*p), GFP_KERNEL);
+	if (p == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	p->br = br;
+	dev_hold(dev);
+	p->dev = dev;
+	p->path_cost = port_cost(dev);
+	p->priority = 0x8000 >> BR_PORT_BITS;
+	p->port_no = index;
+	br_init_port(p);
+	p->state = BR_STATE_DISABLED;
+	br_stp_port_timer_init(p);
+
+	kobject_init(&p->kobj);
+	kobject_set_name(&p->kobj, SYSFS_BRIDGE_PORT_ATTR);
+	p->kobj.ktype = &brport_ktype;
+	p->kobj.parent = &(dev->dev.kobj);
+	p->kobj.kset = NULL;
+
+	return p;
+}
+
+int br_add_bridge(const char *name)
+{
+	struct net_device *dev;
+	int ret;
+
+	dev = new_bridge_dev(name);
+	if (!dev)
+		return -ENOMEM;
+
+	rtnl_lock();
+	if (strchr(dev->name, '%')) {
+		ret = dev_alloc_name(dev, dev->name);
+		if (ret < 0) {
+			free_netdev(dev);
+			goto out;
+		}
+	}
+
+	ret = register_netdevice(dev);
+	if (ret)
+		goto out;
+
+	ret = br_sysfs_addbr(dev);
+	if (ret)
+		unregister_netdevice(dev);
+ out:
+	rtnl_unlock();
+	return ret;
+}
+
+int br_del_bridge(const char *name)
+{
+	struct net_device *dev;
+	int ret = 0;
+
+	rtnl_lock();
+	dev = __dev_get_by_name(name);
+	if (dev == NULL)
+		ret =  -ENXIO; 	/* Could not find device */
+
+	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
+		/* Attempt to delete non bridge device! */
+		ret = -EPERM;
+	}
+
+	else if (dev->flags & IFF_UP) {
+		/* Not shutdown yet. */
+		ret = -EBUSY;
+	}
+
+	else
+		del_br(netdev_priv(dev));
+
+	rtnl_unlock();
+	return ret;
+}
+
+/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
+int br_min_mtu(const struct net_bridge *br)
+{
+	const struct net_bridge_port *p;
+	int mtu = 0;
+
+	ASSERT_RTNL();
+
+	if (list_empty(&br->port_list))
+		mtu = ETH_DATA_LEN;
+	else {
+		list_for_each_entry(p, &br->port_list, list) {
+			if (!mtu  || p->dev->mtu < mtu)
+				mtu = p->dev->mtu;
+		}
+	}
+	return mtu;
+}
+
+/*
+ * Recomputes features using slave's features
+ */
+void br_features_recompute(struct net_bridge *br)
+{
+	struct net_bridge_port *p;
+	unsigned long features, checksum;
+
+	checksum = br->feature_mask & NETIF_F_ALL_CSUM ? NETIF_F_NO_CSUM : 0;
+	features = br->feature_mask & ~NETIF_F_ALL_CSUM;
+
+	list_for_each_entry(p, &br->port_list, list) {
+		unsigned long feature = p->dev->features;
+
+		if (checksum & NETIF_F_NO_CSUM && !(feature & NETIF_F_NO_CSUM))
+			checksum ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;
+		if (checksum & NETIF_F_HW_CSUM && !(feature & NETIF_F_HW_CSUM))
+			checksum ^= NETIF_F_HW_CSUM | NETIF_F_IP_CSUM;
+		if (!(feature & NETIF_F_IP_CSUM))
+			checksum = 0;
+
+		if (feature & NETIF_F_GSO)
+			feature |= NETIF_F_GSO_SOFTWARE;
+		feature |= NETIF_F_GSO;
+
+		features &= feature;
+	}
+
+	if (!(checksum & NETIF_F_ALL_CSUM))
+		features &= ~NETIF_F_SG;
+	if (!(features & NETIF_F_SG))
+		features &= ~NETIF_F_GSO_MASK;
+
+	br->dev->features = features | checksum | NETIF_F_LLTX |
+			    NETIF_F_GSO_ROBUST;
+}
+
+/* called with RTNL */
+int br_add_if(struct net_bridge *br, struct net_device *dev)
+{
+	struct net_bridge_port *p;
+	int err = 0;
+
+	if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER)
+		return -EINVAL;
+
+	if (dev->hard_start_xmit == br_dev_xmit)
+		return -ELOOP;
+
+	if (dev->br_port != NULL)
+		return -EBUSY;
+
+	p = new_nbp(br, dev);
+	if (IS_ERR(p))
+		return PTR_ERR(p);
+
+	err = kobject_add(&p->kobj);
+	if (err)
+		goto err0;
+
+	err = br_fdb_insert(br, p, dev->dev_addr);
+	if (err)
+		goto err1;
+
+	err = br_sysfs_addif(p);
+	if (err)
+		goto err2;
+
+	rcu_assign_pointer(dev->br_port, p);
+	dev_set_promiscuity(dev, 1);
+
+	list_add_rcu(&p->list, &br->port_list);
+
+	spin_lock_bh(&br->lock);
+	br_stp_recalculate_bridge_id(br);
+	br_features_recompute(br);
+
+	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
+	    (br->dev->flags & IFF_UP))
+		br_stp_enable_port(p);
+	spin_unlock_bh(&br->lock);
+
+	dev_set_mtu(br->dev, br_min_mtu(br));
+
+	kobject_uevent(&p->kobj, KOBJ_ADD);
+
+	return 0;
+err2:
+	br_fdb_delete_by_port(br, p, 1);
+err1:
+	kobject_del(&p->kobj);
+err0:
+	kobject_put(&p->kobj);
+	return err;
+}
+
+/* called with RTNL */
+int br_del_if(struct net_bridge *br, struct net_device *dev)
+{
+	struct net_bridge_port *p = dev->br_port;
+
+	if (!p || p->br != br)
+		return -EINVAL;
+
+	del_nbp(p);
+
+	spin_lock_bh(&br->lock);
+	br_stp_recalculate_bridge_id(br);
+	br_features_recompute(br);
+	spin_unlock_bh(&br->lock);
+
+	return 0;
+}
+
+void __exit br_cleanup_bridges(void)
+{
+	struct net_device *dev, *nxt;
+
+	rtnl_lock();
+	for (dev = dev_base; dev; dev = nxt) {
+		nxt = dev->next;
+		if (dev->priv_flags & IFF_EBRIDGE)
+			del_br(dev->priv);
+	}
+	rtnl_unlock();
+
+}

net/bridge/br_input.c

@@ -0,0 +1,157 @@
+/*
+ *	Handle incoming frames
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_input.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
+ *
+ *	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/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/netfilter_bridge.h>
+#include "br_private.h"
+
+/* Bridge group multicast address 802.1d (pg 51). */
+const u8 br_group_address[ETH_ALEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
+
+static void br_pass_frame_up(struct net_bridge *br, struct sk_buff *skb)
+{
+	struct net_device *indev;
+
+	br->statistics.rx_packets++;
+	br->statistics.rx_bytes += skb->len;
+
+	indev = skb->dev;
+	skb->dev = br->dev;
+
+	NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
+		netif_receive_skb);
+}
+
+/* note: already called with rcu_read_lock (preempt_disabled) */
+int br_handle_frame_finish(struct sk_buff *skb)
+{
+	const unsigned char *dest = eth_hdr(skb)->h_dest;
+	struct net_bridge_port *p = rcu_dereference(skb->dev->br_port);
+	struct net_bridge *br;
+	struct net_bridge_fdb_entry *dst;
+	int passedup = 0;
+
+	if (!p || p->state == BR_STATE_DISABLED)
+		goto drop;
+
+	/* insert into forwarding database after filtering to avoid spoofing */
+	br = p->br;
+	br_fdb_update(br, p, eth_hdr(skb)->h_source);
+
+	if (p->state == BR_STATE_LEARNING)
+		goto drop;
+
+	if (br->dev->flags & IFF_PROMISC) {
+		struct sk_buff *skb2;
+
+		skb2 = skb_clone(skb, GFP_ATOMIC);
+		if (skb2 != NULL) {
+			passedup = 1;
+			br_pass_frame_up(br, skb2);
+		}
+	}
+
+	if (is_multicast_ether_addr(dest)) {
+		br->statistics.multicast++;
+		br_flood_forward(br, skb, !passedup);
+		if (!passedup)
+			br_pass_frame_up(br, skb);
+		goto out;
+	}
+
+	dst = __br_fdb_get(br, dest);
+	if (dst != NULL && dst->is_local) {
+		if (!passedup)
+			br_pass_frame_up(br, skb);
+		else
+			kfree_skb(skb);
+		goto out;
+	}
+
+	if (dst != NULL) {
+		br_forward(dst->dst, skb);
+		goto out;
+	}
+
+	br_flood_forward(br, skb, 0);
+
+out:
+	return 0;
+drop:
+	kfree_skb(skb);
+	goto out;
+}
+
+/* note: already called with rcu_read_lock (preempt_disabled) */
+static int br_handle_local_finish(struct sk_buff *skb)
+{
+	struct net_bridge_port *p = rcu_dereference(skb->dev->br_port);
+
+	if (p && p->state != BR_STATE_DISABLED)
+		br_fdb_update(p->br, p, eth_hdr(skb)->h_source);
+
+	return 0;	 /* process further */
+}
+
+/* Does address match the link local multicast address.
+ * 01:80:c2:00:00:0X
+ */
+static inline int is_link_local(const unsigned char *dest)
+{
+	return memcmp(dest, br_group_address, 5) == 0 && (dest[5] & 0xf0) == 0;
+}
+
+/*
+ * Called via br_handle_frame_hook.
+ * Return 0 if *pskb should be processed furthur
+ *	  1 if *pskb is handled
+ * note: already called with rcu_read_lock (preempt_disabled)
+ */
+int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb)
+{
+	struct sk_buff *skb = *pskb;
+	const unsigned char *dest = eth_hdr(skb)->h_dest;
+
+	if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
+		goto err;
+
+	if (unlikely(is_link_local(dest))) {
+		skb->pkt_type = PACKET_HOST;
+		return NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
+			       NULL, br_handle_local_finish) != 0;
+	}
+
+	if (p->state == BR_STATE_FORWARDING || p->state == BR_STATE_LEARNING) {
+		if (br_should_route_hook) {
+			if (br_should_route_hook(pskb))
+				return 0;
+			skb = *pskb;
+			dest = eth_hdr(skb)->h_dest;
+		}
+
+		if (!compare_ether_addr(p->br->dev->dev_addr, dest))
+			skb->pkt_type = PACKET_HOST;
+
+		NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
+			br_handle_frame_finish);
+		return 1;
+	}
+
+err:
+	kfree_skb(skb);
+	return 1;
+}

net/bridge/br_ioctl.c

@@ -0,0 +1,408 @@
+/*
+ *	Ioctl handler
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_ioctl.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
+ *
+ *	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/capability.h>
+#include <linux/kernel.h>
+#include <linux/if_bridge.h>
+#include <linux/netdevice.h>
+#include <linux/times.h>
+#include <asm/uaccess.h>
+#include "br_private.h"
+
+/* called with RTNL */
+static int get_bridge_ifindices(int *indices, int num)
+{
+	struct net_device *dev;
+	int i = 0;
+
+	for (dev = dev_base; dev && i < num; dev = dev->next) {
+		if (dev->priv_flags & IFF_EBRIDGE)
+			indices[i++] = dev->ifindex;
+	}
+
+	return i;
+}
+
+/* called with RTNL */
+static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
+{
+	struct net_bridge_port *p;
+
+	list_for_each_entry(p, &br->port_list, list) {
+		if (p->port_no < num)
+			ifindices[p->port_no] = p->dev->ifindex;
+	}
+}
+
+/*
+ * Format up to a page worth of forwarding table entries
+ * userbuf -- where to copy result
+ * maxnum  -- maximum number of entries desired
+ *            (limited to a page for sanity)
+ * offset  -- number of records to skip
+ */
+static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
+			   unsigned long maxnum, unsigned long offset)
+{
+	int num;
+	void *buf;
+	size_t size;
+
+	/* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
+	if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
+		maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
+
+	size = maxnum * sizeof(struct __fdb_entry);
+
+	buf = kmalloc(size, GFP_USER);
+	if (!buf)
+		return -ENOMEM;
+
+	num = br_fdb_fillbuf(br, buf, maxnum, offset);
+	if (num > 0) {
+		if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
+			num = -EFAULT;
+	}
+	kfree(buf);
+
+	return num;
+}
+
+static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
+{
+	struct net_device *dev;
+	int ret;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	dev = dev_get_by_index(ifindex);
+	if (dev == NULL)
+		return -EINVAL;
+
+	if (isadd)
+		ret = br_add_if(br, dev);
+	else
+		ret = br_del_if(br, dev);
+
+	dev_put(dev);
+	return ret;
+}
+
+/*
+ * Legacy ioctl's through SIOCDEVPRIVATE
+ * This interface is deprecated because it was too difficult to
+ * to do the translation for 32/64bit ioctl compatability.
+ */
+static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct net_bridge *br = netdev_priv(dev);
+	unsigned long args[4];
+
+	if (copy_from_user(args, rq->ifr_data, sizeof(args)))
+		return -EFAULT;
+
+	switch (args[0]) {
+	case BRCTL_ADD_IF:
+	case BRCTL_DEL_IF:
+		return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
+
+	case BRCTL_GET_BRIDGE_INFO:
+	{
+		struct __bridge_info b;
+
+		memset(&b, 0, sizeof(struct __bridge_info));
+		rcu_read_lock();
+		memcpy(&b.designated_root, &br->designated_root, 8);
+		memcpy(&b.bridge_id, &br->bridge_id, 8);
+		b.root_path_cost = br->root_path_cost;
+		b.max_age = jiffies_to_clock_t(br->max_age);
+		b.hello_time = jiffies_to_clock_t(br->hello_time);
+		b.forward_delay = br->forward_delay;
+		b.bridge_max_age = br->bridge_max_age;
+		b.bridge_hello_time = br->bridge_hello_time;
+		b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
+		b.topology_change = br->topology_change;
+		b.topology_change_detected = br->topology_change_detected;
+		b.root_port = br->root_port;
+		b.stp_enabled = br->stp_enabled;
+		b.ageing_time = jiffies_to_clock_t(br->ageing_time);
+		b.hello_timer_value = br_timer_value(&br->hello_timer);
+		b.tcn_timer_value = br_timer_value(&br->tcn_timer);
+		b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
+		b.gc_timer_value = br_timer_value(&br->gc_timer);
+		rcu_read_unlock();
+
+		if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
+			return -EFAULT;
+
+		return 0;
+	}
+
+	case BRCTL_GET_PORT_LIST:
+	{
+		int num, *indices;
+
+		num = args[2];
+		if (num < 0)
+			return -EINVAL;
+		if (num == 0)
+			num = 256;
+		if (num > BR_MAX_PORTS)
+			num = BR_MAX_PORTS;
+
+		indices = kcalloc(num, sizeof(int), GFP_KERNEL);
+		if (indices == NULL)
+			return -ENOMEM;
+
+		get_port_ifindices(br, indices, num);
+		if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
+			num =  -EFAULT;
+		kfree(indices);
+		return num;
+	}
+
+	case BRCTL_SET_BRIDGE_FORWARD_DELAY:
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		spin_lock_bh(&br->lock);
+		br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
+		if (br_is_root_bridge(br))
+			br->forward_delay = br->bridge_forward_delay;
+		spin_unlock_bh(&br->lock);
+		return 0;
+
+	case BRCTL_SET_BRIDGE_HELLO_TIME:
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		spin_lock_bh(&br->lock);
+		br->bridge_hello_time = clock_t_to_jiffies(args[1]);
+		if (br_is_root_bridge(br))
+			br->hello_time = br->bridge_hello_time;
+		spin_unlock_bh(&br->lock);
+		return 0;
+
+	case BRCTL_SET_BRIDGE_MAX_AGE:
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		spin_lock_bh(&br->lock);
+		br->bridge_max_age = clock_t_to_jiffies(args[1]);
+		if (br_is_root_bridge(br))
+			br->max_age = br->bridge_max_age;
+		spin_unlock_bh(&br->lock);
+		return 0;
+
+	case BRCTL_SET_AGEING_TIME:
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		br->ageing_time = clock_t_to_jiffies(args[1]);
+		return 0;
+
+	case BRCTL_GET_PORT_INFO:
+	{
+		struct __port_info p;
+		struct net_bridge_port *pt;
+
+		rcu_read_lock();
+		if ((pt = br_get_port(br, args[2])) == NULL) {
+			rcu_read_unlock();
+			return -EINVAL;
+		}
+
+		memset(&p, 0, sizeof(struct __port_info));
+		memcpy(&p.designated_root, &pt->designated_root, 8);
+		memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
+		p.port_id = pt->port_id;
+		p.designated_port = pt->designated_port;
+		p.path_cost = pt->path_cost;
+		p.designated_cost = pt->designated_cost;
+		p.state = pt->state;
+		p.top_change_ack = pt->topology_change_ack;
+		p.config_pending = pt->config_pending;
+		p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
+		p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
+		p.hold_timer_value = br_timer_value(&pt->hold_timer);
+
+		rcu_read_unlock();
+
+		if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
+			return -EFAULT;
+
+		return 0;
+	}
+
+	case BRCTL_SET_BRIDGE_STP_STATE:
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		br->stp_enabled = args[1]?1:0;
+		return 0;
+
+	case BRCTL_SET_BRIDGE_PRIORITY:
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		spin_lock_bh(&br->lock);
+		br_stp_set_bridge_priority(br, args[1]);
+		spin_unlock_bh(&br->lock);
+		return 0;
+
+	case BRCTL_SET_PORT_PRIORITY:
+	{
+		struct net_bridge_port *p;
+		int ret = 0;
+
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		if (args[2] >= (1<<(16-BR_PORT_BITS)))
+			return -ERANGE;
+
+		spin_lock_bh(&br->lock);
+		if ((p = br_get_port(br, args[1])) == NULL)
+			ret = -EINVAL;
+		else
+			br_stp_set_port_priority(p, args[2]);
+		spin_unlock_bh(&br->lock);
+		return ret;
+	}
+
+	case BRCTL_SET_PATH_COST:
+	{
+		struct net_bridge_port *p;
+		int ret = 0;
+
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		if ((p = br_get_port(br, args[1])) == NULL)
+			ret = -EINVAL;
+		else
+			br_stp_set_path_cost(p, args[2]);
+
+		return ret;
+	}
+
+	case BRCTL_GET_FDB_ENTRIES:
+		return get_fdb_entries(br, (void __user *)args[1],
+				       args[2], args[3]);
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static int old_deviceless(void __user *uarg)
+{
+	unsigned long args[3];
+
+	if (copy_from_user(args, uarg, sizeof(args)))
+		return -EFAULT;
+
+	switch (args[0]) {
+	case BRCTL_GET_VERSION:
+		return BRCTL_VERSION;
+
+	case BRCTL_GET_BRIDGES:
+	{
+		int *indices;
+		int ret = 0;
+
+		if (args[2] >= 2048)
+			return -ENOMEM;
+		indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
+		if (indices == NULL)
+			return -ENOMEM;
+
+		args[2] = get_bridge_ifindices(indices, args[2]);
+
+		ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
+			? -EFAULT : args[2];
+
+		kfree(indices);
+		return ret;
+	}
+
+	case BRCTL_ADD_BRIDGE:
+	case BRCTL_DEL_BRIDGE:
+	{
+		char buf[IFNAMSIZ];
+
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
+			return -EFAULT;
+
+		buf[IFNAMSIZ-1] = 0;
+
+		if (args[0] == BRCTL_ADD_BRIDGE)
+			return br_add_bridge(buf);
+
+		return br_del_bridge(buf);
+	}
+	}
+
+	return -EOPNOTSUPP;
+}
+
+int br_ioctl_deviceless_stub(unsigned int cmd, void __user *uarg)
+{
+	switch (cmd) {
+	case SIOCGIFBR:
+	case SIOCSIFBR:
+		return old_deviceless(uarg);
+
+	case SIOCBRADDBR:
+	case SIOCBRDELBR:
+	{
+		char buf[IFNAMSIZ];
+
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		if (copy_from_user(buf, uarg, IFNAMSIZ))
+			return -EFAULT;
+
+		buf[IFNAMSIZ-1] = 0;
+		if (cmd == SIOCBRADDBR)
+			return br_add_bridge(buf);
+
+		return br_del_bridge(buf);
+	}
+	}
+	return -EOPNOTSUPP;
+}
+
+int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct net_bridge *br = netdev_priv(dev);
+
+	switch(cmd) {
+	case SIOCDEVPRIVATE:
+		return old_dev_ioctl(dev, rq, cmd);
+
+	case SIOCBRADDIF:
+	case SIOCBRDELIF:
+		return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
+
+	}
+
+	pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
+	return -EOPNOTSUPP;
+}

net/bridge/br_netfilter.c

@@ -0,0 +1,978 @@
+/*
+ *	Handle firewalling
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek               <buytenh@gnu.org>
+ *	Bart De Schuymer (maintainer)	<bdschuym@pandora.be>
+ *
+ *	Changes:
+ *	Apr 29 2003: physdev module support (bdschuym)
+ *	Jun 19 2003: let arptables see bridged ARP traffic (bdschuym)
+ *	Oct 06 2003: filter encapsulated IP/ARP VLAN traffic on untagged bridge
+ *	             (bdschuym)
+ *	Sep 01 2004: add IPv6 filtering (bdschuym)
+ *
+ *	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.
+ *
+ *	Lennert dedicates this file to Kerstin Wurdinger.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/ip.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter_arp.h>
+#include <linux/in_route.h>
+#include <linux/inetdevice.h>
+
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/route.h>
+
+#include <asm/uaccess.h>
+#include "br_private.h"
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+
+#define skb_origaddr(skb)	 (((struct bridge_skb_cb *) \
+				 (skb->nf_bridge->data))->daddr.ipv4)
+#define store_orig_dstaddr(skb)	 (skb_origaddr(skb) = (skb)->nh.iph->daddr)
+#define dnat_took_place(skb)	 (skb_origaddr(skb) != (skb)->nh.iph->daddr)
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table_header *brnf_sysctl_header;
+static int brnf_call_iptables __read_mostly = 1;
+static int brnf_call_ip6tables __read_mostly = 1;
+static int brnf_call_arptables __read_mostly = 1;
+static int brnf_filter_vlan_tagged __read_mostly = 1;
+#else
+#define brnf_filter_vlan_tagged 1
+#endif
+
+static inline __be16 vlan_proto(const struct sk_buff *skb)
+{
+	return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto;
+}
+
+#define IS_VLAN_IP(skb) \
+	(skb->protocol == htons(ETH_P_8021Q) && \
+	 vlan_proto(skb) == htons(ETH_P_IP) && 	\
+	 brnf_filter_vlan_tagged)
+
+#define IS_VLAN_IPV6(skb) \
+	(skb->protocol == htons(ETH_P_8021Q) && \
+	 vlan_proto(skb) == htons(ETH_P_IPV6) &&\
+	 brnf_filter_vlan_tagged)
+
+#define IS_VLAN_ARP(skb) \
+	(skb->protocol == htons(ETH_P_8021Q) &&	\
+	 vlan_proto(skb) == htons(ETH_P_ARP) &&	\
+	 brnf_filter_vlan_tagged)
+
+/* We need these fake structures to make netfilter happy --
+ * lots of places assume that skb->dst != NULL, which isn't
+ * all that unreasonable.
+ *
+ * Currently, we fill in the PMTU entry because netfilter
+ * refragmentation needs it, and the rt_flags entry because
+ * ipt_REJECT needs it.  Future netfilter modules might
+ * require us to fill additional fields. */
+static struct net_device __fake_net_device = {
+	.hard_header_len	= ETH_HLEN
+};
+
+static struct rtable __fake_rtable = {
+	.u = {
+		.dst = {
+			.__refcnt		= ATOMIC_INIT(1),
+			.dev			= &__fake_net_device,
+			.path			= &__fake_rtable.u.dst,
+			.metrics		= {[RTAX_MTU - 1] = 1500},
+			.flags			= DST_NOXFRM,
+		}
+	},
+	.rt_flags	= 0,
+};
+
+static inline struct net_device *bridge_parent(const struct net_device *dev)
+{
+	struct net_bridge_port *port = rcu_dereference(dev->br_port);
+
+	return port ? port->br->dev : NULL;
+}
+
+static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
+{
+	skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC);
+	if (likely(skb->nf_bridge))
+		atomic_set(&(skb->nf_bridge->use), 1);
+
+	return skb->nf_bridge;
+}
+
+static inline void nf_bridge_save_header(struct sk_buff *skb)
+{
+	int header_size = ETH_HLEN;
+
+	if (skb->protocol == htons(ETH_P_8021Q))
+		header_size += VLAN_HLEN;
+
+	memcpy(skb->nf_bridge->data, skb->data - header_size, header_size);
+}
+
+/*
+ * When forwarding bridge frames, we save a copy of the original
+ * header before processing.
+ */
+int nf_bridge_copy_header(struct sk_buff *skb)
+{
+	int err;
+	int header_size = ETH_HLEN;
+
+	if (skb->protocol == htons(ETH_P_8021Q))
+		header_size += VLAN_HLEN;
+
+	err = skb_cow(skb, header_size);
+	if (err)
+		return err;
+
+	memcpy(skb->data - header_size, skb->nf_bridge->data, header_size);
+
+	if (skb->protocol == htons(ETH_P_8021Q))
+		__skb_push(skb, VLAN_HLEN);
+	return 0;
+}
+
+/* PF_BRIDGE/PRE_ROUTING *********************************************/
+/* Undo the changes made for ip6tables PREROUTING and continue the
+ * bridge PRE_ROUTING hook. */
+static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb)
+{
+	struct nf_bridge_info *nf_bridge = skb->nf_bridge;
+
+	if (nf_bridge->mask & BRNF_PKT_TYPE) {
+		skb->pkt_type = PACKET_OTHERHOST;
+		nf_bridge->mask ^= BRNF_PKT_TYPE;
+	}
+	nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
+
+	skb->dst = (struct dst_entry *)&__fake_rtable;
+	dst_hold(skb->dst);
+
+	skb->dev = nf_bridge->physindev;
+	if (skb->protocol == htons(ETH_P_8021Q)) {
+		skb_push(skb, VLAN_HLEN);
+		skb->nh.raw -= VLAN_HLEN;
+	}
+	NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
+		       br_handle_frame_finish, 1);
+
+	return 0;
+}
+
+static void __br_dnat_complain(void)
+{
+	static unsigned long last_complaint;
+
+	if (jiffies - last_complaint >= 5 * HZ) {
+		printk(KERN_WARNING "Performing cross-bridge DNAT requires IP "
+		       "forwarding to be enabled\n");
+		last_complaint = jiffies;
+	}
+}
+
+/* This requires some explaining. If DNAT has taken place,
+ * we will need to fix up the destination Ethernet address,
+ * and this is a tricky process.
+ *
+ * There are two cases to consider:
+ * 1. The packet was DNAT'ed to a device in the same bridge
+ *    port group as it was received on. We can still bridge
+ *    the packet.
+ * 2. The packet was DNAT'ed to a different device, either
+ *    a non-bridged device or another bridge port group.
+ *    The packet will need to be routed.
+ *
+ * The correct way of distinguishing between these two cases is to
+ * call ip_route_input() and to look at skb->dst->dev, which is
+ * changed to the destination device if ip_route_input() succeeds.
+ *
+ * Let us first consider the case that ip_route_input() succeeds:
+ *
+ * If skb->dst->dev equals the logical bridge device the packet
+ * came in on, we can consider this bridging. We then call
+ * skb->dst->output() which will make the packet enter br_nf_local_out()
+ * not much later. In that function it is assured that the iptables
+ * FORWARD chain is traversed for the packet.
+ *
+ * Otherwise, the packet is considered to be routed and we just
+ * change the destination MAC address so that the packet will
+ * later be passed up to the IP stack to be routed. For a redirected
+ * packet, ip_route_input() will give back the localhost as output device,
+ * which differs from the bridge device.
+ *
+ * Let us now consider the case that ip_route_input() fails:
+ *
+ * This can be because the destination address is martian, in which case
+ * the packet will be dropped.
+ * After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input()
+ * will fail, while __ip_route_output_key() will return success. The source
+ * address for __ip_route_output_key() is set to zero, so __ip_route_output_key
+ * thinks we're handling a locally generated packet and won't care
+ * if IP forwarding is allowed. We send a warning message to the users's
+ * log telling her to put IP forwarding on.
+ *
+ * ip_route_input() will also fail if there is no route available.
+ * In that case we just drop the packet.
+ *
+ * --Lennert, 20020411
+ * --Bart, 20020416 (updated)
+ * --Bart, 20021007 (updated)
+ * --Bart, 20062711 (updated) */
+static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb)
+{
+	if (skb->pkt_type == PACKET_OTHERHOST) {
+		skb->pkt_type = PACKET_HOST;
+		skb->nf_bridge->mask |= BRNF_PKT_TYPE;
+	}
+	skb->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
+
+	skb->dev = bridge_parent(skb->dev);
+	if (!skb->dev)
+		kfree_skb(skb);
+	else {
+		if (skb->protocol == htons(ETH_P_8021Q)) {
+			skb_pull(skb, VLAN_HLEN);
+			skb->nh.raw += VLAN_HLEN;
+		}
+		skb->dst->output(skb);
+	}
+	return 0;
+}
+
+static int br_nf_pre_routing_finish(struct sk_buff *skb)
+{
+	struct net_device *dev = skb->dev;
+	struct iphdr *iph = skb->nh.iph;
+	struct nf_bridge_info *nf_bridge = skb->nf_bridge;
+	int err;
+
+	if (nf_bridge->mask & BRNF_PKT_TYPE) {
+		skb->pkt_type = PACKET_OTHERHOST;
+		nf_bridge->mask ^= BRNF_PKT_TYPE;
+	}
+	nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
+	if (dnat_took_place(skb)) {
+		if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) {
+			struct rtable *rt;
+			struct flowi fl = {
+				.nl_u = {
+					.ip4_u = {
+						 .daddr = iph->daddr,
+						 .saddr = 0,
+						 .tos = RT_TOS(iph->tos) },
+				},
+				.proto = 0,
+			};
+			struct in_device *in_dev = in_dev_get(dev);
+
+			/* If err equals -EHOSTUNREACH the error is due to a
+			 * martian destination or due to the fact that
+			 * forwarding is disabled. For most martian packets,
+			 * ip_route_output_key() will fail. It won't fail for 2 types of
+			 * martian destinations: loopback destinations and destination
+			 * 0.0.0.0. In both cases the packet will be dropped because the
+			 * destination is the loopback device and not the bridge. */
+			if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev))
+				goto free_skb;
+
+			if (!ip_route_output_key(&rt, &fl)) {
+				/* - Bridged-and-DNAT'ed traffic doesn't
+				 *   require ip_forwarding. */
+				if (((struct dst_entry *)rt)->dev == dev) {
+					skb->dst = (struct dst_entry *)rt;
+					goto bridged_dnat;
+				}
+				/* we are sure that forwarding is disabled, so printing
+				 * this message is no problem. Note that the packet could
+				 * still have a martian destination address, in which case
+				 * the packet could be dropped even if forwarding were enabled */
+				__br_dnat_complain();
+				dst_release((struct dst_entry *)rt);
+			}
+free_skb:
+			kfree_skb(skb);
+			return 0;
+		} else {
+			if (skb->dst->dev == dev) {
+bridged_dnat:
+				/* Tell br_nf_local_out this is a
+				 * bridged frame */
+				nf_bridge->mask |= BRNF_BRIDGED_DNAT;
+				skb->dev = nf_bridge->physindev;
+				if (skb->protocol ==
+				    htons(ETH_P_8021Q)) {
+					skb_push(skb, VLAN_HLEN);
+					skb->nh.raw -= VLAN_HLEN;
+				}
+				NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING,
+					       skb, skb->dev, NULL,
+					       br_nf_pre_routing_finish_bridge,
+					       1);
+				return 0;
+			}
+			memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN);
+			skb->pkt_type = PACKET_HOST;
+		}
+	} else {
+		skb->dst = (struct dst_entry *)&__fake_rtable;
+		dst_hold(skb->dst);
+	}
+
+	skb->dev = nf_bridge->physindev;
+	if (skb->protocol == htons(ETH_P_8021Q)) {
+		skb_push(skb, VLAN_HLEN);
+		skb->nh.raw -= VLAN_HLEN;
+	}
+	NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
+		       br_handle_frame_finish, 1);
+
+	return 0;
+}
+
+/* Some common code for IPv4/IPv6 */
+static struct net_device *setup_pre_routing(struct sk_buff *skb)
+{
+	struct nf_bridge_info *nf_bridge = skb->nf_bridge;
+
+	if (skb->pkt_type == PACKET_OTHERHOST) {
+		skb->pkt_type = PACKET_HOST;
+		nf_bridge->mask |= BRNF_PKT_TYPE;
+	}
+
+	nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING;
+	nf_bridge->physindev = skb->dev;
+	skb->dev = bridge_parent(skb->dev);
+
+	return skb->dev;
+}
+
+/* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */
+static int check_hbh_len(struct sk_buff *skb)
+{
+	unsigned char *raw = (u8 *) (skb->nh.ipv6h + 1);
+	u32 pkt_len;
+	int off = raw - skb->nh.raw;
+	int len = (raw[1] + 1) << 3;
+
+	if ((raw + len) - skb->data > skb_headlen(skb))
+		goto bad;
+
+	off += 2;
+	len -= 2;
+
+	while (len > 0) {
+		int optlen = skb->nh.raw[off + 1] + 2;
+
+		switch (skb->nh.raw[off]) {
+		case IPV6_TLV_PAD0:
+			optlen = 1;
+			break;
+
+		case IPV6_TLV_PADN:
+			break;
+
+		case IPV6_TLV_JUMBO:
+			if (skb->nh.raw[off + 1] != 4 || (off & 3) != 2)
+				goto bad;
+			pkt_len = ntohl(*(__be32 *) (skb->nh.raw + off + 2));
+			if (pkt_len <= IPV6_MAXPLEN ||
+			    skb->nh.ipv6h->payload_len)
+				goto bad;
+			if (pkt_len > skb->len - sizeof(struct ipv6hdr))
+				goto bad;
+			if (pskb_trim_rcsum(skb,
+					    pkt_len + sizeof(struct ipv6hdr)))
+				goto bad;
+			break;
+		default:
+			if (optlen > len)
+				goto bad;
+			break;
+		}
+		off += optlen;
+		len -= optlen;
+	}
+	if (len == 0)
+		return 0;
+bad:
+	return -1;
+
+}
+
+/* Replicate the checks that IPv6 does on packet reception and pass the packet
+ * to ip6tables, which doesn't support NAT, so things are fairly simple. */
+static unsigned int br_nf_pre_routing_ipv6(unsigned int hook,
+					   struct sk_buff *skb,
+					   const struct net_device *in,
+					   const struct net_device *out,
+					   int (*okfn)(struct sk_buff *))
+{
+	struct ipv6hdr *hdr;
+	u32 pkt_len;
+
+	if (skb->len < sizeof(struct ipv6hdr))
+		goto inhdr_error;
+
+	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+		goto inhdr_error;
+
+	hdr = skb->nh.ipv6h;
+
+	if (hdr->version != 6)
+		goto inhdr_error;
+
+	pkt_len = ntohs(hdr->payload_len);
+
+	if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
+		if (pkt_len + sizeof(struct ipv6hdr) > skb->len)
+			goto inhdr_error;
+		if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr)))
+			goto inhdr_error;
+	}
+	if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb))
+		goto inhdr_error;
+
+	nf_bridge_put(skb->nf_bridge);
+	if (!nf_bridge_alloc(skb))
+		return NF_DROP;
+	if (!setup_pre_routing(skb))
+		return NF_DROP;
+
+	NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL,
+		br_nf_pre_routing_finish_ipv6);
+
+	return NF_STOLEN;
+
+inhdr_error:
+	return NF_DROP;
+}
+
+/* Direct IPv6 traffic to br_nf_pre_routing_ipv6.
+ * Replicate the checks that IPv4 does on packet reception.
+ * Set skb->dev to the bridge device (i.e. parent of the
+ * receiving device) to make netfilter happy, the REDIRECT
+ * target in particular.  Save the original destination IP
+ * address to be able to detect DNAT afterwards. */
+static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
+				      const struct net_device *in,
+				      const struct net_device *out,
+				      int (*okfn)(struct sk_buff *))
+{
+	struct iphdr *iph;
+	__u32 len;
+	struct sk_buff *skb = *pskb;
+
+	if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb)) {
+#ifdef CONFIG_SYSCTL
+		if (!brnf_call_ip6tables)
+			return NF_ACCEPT;
+#endif
+		if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)
+			goto out;
+
+		if (skb->protocol == htons(ETH_P_8021Q)) {
+			skb_pull_rcsum(skb, VLAN_HLEN);
+			skb->nh.raw += VLAN_HLEN;
+		}
+		return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn);
+	}
+#ifdef CONFIG_SYSCTL
+	if (!brnf_call_iptables)
+		return NF_ACCEPT;
+#endif
+
+	if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb))
+		return NF_ACCEPT;
+
+	if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)
+		goto out;
+
+	if (skb->protocol == htons(ETH_P_8021Q)) {
+		skb_pull_rcsum(skb, VLAN_HLEN);
+		skb->nh.raw += VLAN_HLEN;
+	}
+
+	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+		goto inhdr_error;
+
+	iph = skb->nh.iph;
+	if (iph->ihl < 5 || iph->version != 4)
+		goto inhdr_error;
+
+	if (!pskb_may_pull(skb, 4 * iph->ihl))
+		goto inhdr_error;
+
+	iph = skb->nh.iph;
+	if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0)
+		goto inhdr_error;
+
+	len = ntohs(iph->tot_len);
+	if (skb->len < len || len < 4 * iph->ihl)
+		goto inhdr_error;
+
+	pskb_trim_rcsum(skb, len);
+
+	nf_bridge_put(skb->nf_bridge);
+	if (!nf_bridge_alloc(skb))
+		return NF_DROP;
+	if (!setup_pre_routing(skb))
+		return NF_DROP;
+	store_orig_dstaddr(skb);
+
+	NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL,
+		br_nf_pre_routing_finish);
+
+	return NF_STOLEN;
+
+inhdr_error:
+//      IP_INC_STATS_BH(IpInHdrErrors);
+out:
+	return NF_DROP;
+}
+
+
+/* PF_BRIDGE/LOCAL_IN ************************************************/
+/* The packet is locally destined, which requires a real
+ * dst_entry, so detach the fake one.  On the way up, the
+ * packet would pass through PRE_ROUTING again (which already
+ * took place when the packet entered the bridge), but we
+ * register an IPv4 PRE_ROUTING 'sabotage' hook that will
+ * prevent this from happening. */
+static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff **pskb,
+				   const struct net_device *in,
+				   const struct net_device *out,
+				   int (*okfn)(struct sk_buff *))
+{
+	struct sk_buff *skb = *pskb;
+
+	if (skb->dst == (struct dst_entry *)&__fake_rtable) {
+		dst_release(skb->dst);
+		skb->dst = NULL;
+	}
+
+	return NF_ACCEPT;
+}
+
+/* PF_BRIDGE/FORWARD *************************************************/
+static int br_nf_forward_finish(struct sk_buff *skb)
+{
+	struct nf_bridge_info *nf_bridge = skb->nf_bridge;
+	struct net_device *in;
+
+	if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) {
+		in = nf_bridge->physindev;
+		if (nf_bridge->mask & BRNF_PKT_TYPE) {
+			skb->pkt_type = PACKET_OTHERHOST;
+			nf_bridge->mask ^= BRNF_PKT_TYPE;
+		}
+	} else {
+		in = *((struct net_device **)(skb->cb));
+	}
+	if (skb->protocol == htons(ETH_P_8021Q)) {
+		skb_push(skb, VLAN_HLEN);
+		skb->nh.raw -= VLAN_HLEN;
+	}
+	NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in,
+		       skb->dev, br_forward_finish, 1);
+	return 0;
+}
+
+/* This is the 'purely bridged' case.  For IP, we pass the packet to
+ * netfilter with indev and outdev set to the bridge device,
+ * but we are still able to filter on the 'real' indev/outdev
+ * because of the physdev module. For ARP, indev and outdev are the
+ * bridge ports. */
+static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff **pskb,
+				     const struct net_device *in,
+				     const struct net_device *out,
+				     int (*okfn)(struct sk_buff *))
+{
+	struct sk_buff *skb = *pskb;
+	struct nf_bridge_info *nf_bridge;
+	struct net_device *parent;
+	int pf;
+
+	if (!skb->nf_bridge)
+		return NF_ACCEPT;
+
+	parent = bridge_parent(out);
+	if (!parent)
+		return NF_DROP;
+
+	if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb))
+		pf = PF_INET;
+	else
+		pf = PF_INET6;
+
+	if (skb->protocol == htons(ETH_P_8021Q)) {
+		skb_pull(*pskb, VLAN_HLEN);
+		(*pskb)->nh.raw += VLAN_HLEN;
+	}
+
+	nf_bridge = skb->nf_bridge;
+	if (skb->pkt_type == PACKET_OTHERHOST) {
+		skb->pkt_type = PACKET_HOST;
+		nf_bridge->mask |= BRNF_PKT_TYPE;
+	}
+
+	/* The physdev module checks on this */
+	nf_bridge->mask |= BRNF_BRIDGED;
+	nf_bridge->physoutdev = skb->dev;
+
+	NF_HOOK(pf, NF_IP_FORWARD, skb, bridge_parent(in), parent,
+		br_nf_forward_finish);
+
+	return NF_STOLEN;
+}
+
+static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff **pskb,
+				      const struct net_device *in,
+				      const struct net_device *out,
+				      int (*okfn)(struct sk_buff *))
+{
+	struct sk_buff *skb = *pskb;
+	struct net_device **d = (struct net_device **)(skb->cb);
+
+#ifdef CONFIG_SYSCTL
+	if (!brnf_call_arptables)
+		return NF_ACCEPT;
+#endif
+
+	if (skb->protocol != htons(ETH_P_ARP)) {
+		if (!IS_VLAN_ARP(skb))
+			return NF_ACCEPT;
+		skb_pull(*pskb, VLAN_HLEN);
+		(*pskb)->nh.raw += VLAN_HLEN;
+	}
+
+	if (skb->nh.arph->ar_pln != 4) {
+		if (IS_VLAN_ARP(skb)) {
+			skb_push(*pskb, VLAN_HLEN);
+			(*pskb)->nh.raw -= VLAN_HLEN;
+		}
+		return NF_ACCEPT;
+	}
+	*d = (struct net_device *)in;
+	NF_HOOK(NF_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in,
+		(struct net_device *)out, br_nf_forward_finish);
+
+	return NF_STOLEN;
+}
+
+/* PF_BRIDGE/LOCAL_OUT ***********************************************
+ *
+ * This function sees both locally originated IP packets and forwarded
+ * IP packets (in both cases the destination device is a bridge
+ * device). It also sees bridged-and-DNAT'ed packets.
+ *
+ * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged
+ * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward()
+ * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority
+ * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor
+ * will be executed.
+ */
+static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb,
+				    const struct net_device *in,
+				    const struct net_device *out,
+				    int (*okfn)(struct sk_buff *))
+{
+	struct net_device *realindev;
+	struct sk_buff *skb = *pskb;
+	struct nf_bridge_info *nf_bridge;
+
+	if (!skb->nf_bridge)
+		return NF_ACCEPT;
+
+	nf_bridge = skb->nf_bridge;
+	if (!(nf_bridge->mask & BRNF_BRIDGED_DNAT))
+		return NF_ACCEPT;
+
+	/* Bridged, take PF_BRIDGE/FORWARD.
+	 * (see big note in front of br_nf_pre_routing_finish) */
+	nf_bridge->physoutdev = skb->dev;
+	realindev = nf_bridge->physindev;
+
+	if (nf_bridge->mask & BRNF_PKT_TYPE) {
+		skb->pkt_type = PACKET_OTHERHOST;
+		nf_bridge->mask ^= BRNF_PKT_TYPE;
+	}
+	if (skb->protocol == htons(ETH_P_8021Q)) {
+		skb_push(skb, VLAN_HLEN);
+		skb->nh.raw -= VLAN_HLEN;
+	}
+
+	NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev, skb->dev,
+		br_forward_finish);
+	return NF_STOLEN;
+}
+
+static int br_nf_dev_queue_xmit(struct sk_buff *skb)
+{
+	if (skb->protocol == htons(ETH_P_IP) &&
+	    skb->len > skb->dev->mtu &&
+	    !skb_is_gso(skb))
+		return ip_fragment(skb, br_dev_queue_push_xmit);
+	else
+		return br_dev_queue_push_xmit(skb);
+}
+
+/* PF_BRIDGE/POST_ROUTING ********************************************/
+static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb,
+				       const struct net_device *in,
+				       const struct net_device *out,
+				       int (*okfn)(struct sk_buff *))
+{
+	struct sk_buff *skb = *pskb;
+	struct nf_bridge_info *nf_bridge = (*pskb)->nf_bridge;
+	struct net_device *realoutdev = bridge_parent(skb->dev);
+	int pf;
+
+#ifdef CONFIG_NETFILTER_DEBUG
+	/* Be very paranoid. This probably won't happen anymore, but let's
+	 * keep the check just to be sure... */
+	if (skb->mac.raw < skb->head || skb->mac.raw + ETH_HLEN > skb->data) {
+		printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: "
+		       "bad mac.raw pointer.\n");
+		goto print_error;
+	}
+#endif
+
+	if (!nf_bridge)
+		return NF_ACCEPT;
+
+	if (!realoutdev)
+		return NF_DROP;
+
+	if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb))
+		pf = PF_INET;
+	else
+		pf = PF_INET6;
+
+#ifdef CONFIG_NETFILTER_DEBUG
+	if (skb->dst == NULL) {
+		printk(KERN_INFO "br_netfilter post_routing: skb->dst == NULL\n");
+		goto print_error;
+	}
+#endif
+
+	/* We assume any code from br_dev_queue_push_xmit onwards doesn't care
+	 * about the value of skb->pkt_type. */
+	if (skb->pkt_type == PACKET_OTHERHOST) {
+		skb->pkt_type = PACKET_HOST;
+		nf_bridge->mask |= BRNF_PKT_TYPE;
+	}
+
+	if (skb->protocol == htons(ETH_P_8021Q)) {
+		skb_pull(skb, VLAN_HLEN);
+		skb->nh.raw += VLAN_HLEN;
+	}
+
+	nf_bridge_save_header(skb);
+
+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
+	if (nf_bridge->netoutdev)
+		realoutdev = nf_bridge->netoutdev;
+#endif
+	NF_HOOK(pf, NF_IP_POST_ROUTING, skb, NULL, realoutdev,
+		br_nf_dev_queue_xmit);
+
+	return NF_STOLEN;
+
+#ifdef CONFIG_NETFILTER_DEBUG
+print_error:
+	if (skb->dev != NULL) {
+		printk("[%s]", skb->dev->name);
+		if (realoutdev)
+			printk("[%s]", realoutdev->name);
+	}
+	printk(" head:%p, raw:%p, data:%p\n", skb->head, skb->mac.raw,
+	       skb->data);
+	dump_stack();
+	return NF_ACCEPT;
+#endif
+}
+
+/* IP/SABOTAGE *****************************************************/
+/* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING
+ * for the second time. */
+static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff **pskb,
+				   const struct net_device *in,
+				   const struct net_device *out,
+				   int (*okfn)(struct sk_buff *))
+{
+	if ((*pskb)->nf_bridge &&
+	    !((*pskb)->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) {
+		return NF_STOP;
+	}
+
+	return NF_ACCEPT;
+}
+
+/* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent
+ * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input.
+ * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because
+ * ip_refrag() can return NF_STOLEN. */
+static struct nf_hook_ops br_nf_ops[] = {
+	{ .hook = br_nf_pre_routing,
+	  .owner = THIS_MODULE,
+	  .pf = PF_BRIDGE,
+	  .hooknum = NF_BR_PRE_ROUTING,
+	  .priority = NF_BR_PRI_BRNF, },
+	{ .hook = br_nf_local_in,
+	  .owner = THIS_MODULE,
+	  .pf = PF_BRIDGE,
+	  .hooknum = NF_BR_LOCAL_IN,
+	  .priority = NF_BR_PRI_BRNF, },
+	{ .hook = br_nf_forward_ip,
+	  .owner = THIS_MODULE,
+	  .pf = PF_BRIDGE,
+	  .hooknum = NF_BR_FORWARD,
+	  .priority = NF_BR_PRI_BRNF - 1, },
+	{ .hook = br_nf_forward_arp,
+	  .owner = THIS_MODULE,
+	  .pf = PF_BRIDGE,
+	  .hooknum = NF_BR_FORWARD,
+	  .priority = NF_BR_PRI_BRNF, },
+	{ .hook = br_nf_local_out,
+	  .owner = THIS_MODULE,
+	  .pf = PF_BRIDGE,
+	  .hooknum = NF_BR_LOCAL_OUT,
+	  .priority = NF_BR_PRI_FIRST, },
+	{ .hook = br_nf_post_routing,
+	  .owner = THIS_MODULE,
+	  .pf = PF_BRIDGE,
+	  .hooknum = NF_BR_POST_ROUTING,
+	  .priority = NF_BR_PRI_LAST, },
+	{ .hook = ip_sabotage_in,
+	  .owner = THIS_MODULE,
+	  .pf = PF_INET,
+	  .hooknum = NF_IP_PRE_ROUTING,
+	  .priority = NF_IP_PRI_FIRST, },
+	{ .hook = ip_sabotage_in,
+	  .owner = THIS_MODULE,
+	  .pf = PF_INET6,
+	  .hooknum = NF_IP6_PRE_ROUTING,
+	  .priority = NF_IP6_PRI_FIRST, },
+};
+
+#ifdef CONFIG_SYSCTL
+static
+int brnf_sysctl_call_tables(ctl_table * ctl, int write, struct file *filp,
+			    void __user * buffer, size_t * lenp, loff_t * ppos)
+{
+	int ret;
+
+	ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
+
+	if (write && *(int *)(ctl->data))
+		*(int *)(ctl->data) = 1;
+	return ret;
+}
+
+static ctl_table brnf_table[] = {
+	{
+		.ctl_name	= NET_BRIDGE_NF_CALL_ARPTABLES,
+		.procname	= "bridge-nf-call-arptables",
+		.data		= &brnf_call_arptables,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &brnf_sysctl_call_tables,
+	},
+	{
+		.ctl_name	= NET_BRIDGE_NF_CALL_IPTABLES,
+		.procname	= "bridge-nf-call-iptables",
+		.data		= &brnf_call_iptables,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &brnf_sysctl_call_tables,
+	},
+	{
+		.ctl_name	= NET_BRIDGE_NF_CALL_IP6TABLES,
+		.procname	= "bridge-nf-call-ip6tables",
+		.data		= &brnf_call_ip6tables,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &brnf_sysctl_call_tables,
+	},
+	{
+		.ctl_name	= NET_BRIDGE_NF_FILTER_VLAN_TAGGED,
+		.procname	= "bridge-nf-filter-vlan-tagged",
+		.data		= &brnf_filter_vlan_tagged,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &brnf_sysctl_call_tables,
+	},
+	{ .ctl_name = 0 }
+};
+
+static ctl_table brnf_bridge_table[] = {
+	{
+		.ctl_name	= NET_BRIDGE,
+		.procname	= "bridge",
+		.mode		= 0555,
+		.child		= brnf_table,
+	},
+	{ .ctl_name = 0 }
+};
+
+static ctl_table brnf_net_table[] = {
+	{
+		.ctl_name	= CTL_NET,
+		.procname	= "net",
+		.mode		= 0555,
+		.child		= brnf_bridge_table,
+	},
+	{ .ctl_name = 0 }
+};
+#endif
+
+int __init br_netfilter_init(void)
+{
+	int ret;
+
+	ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops));
+	if (ret < 0)
+		return ret;
+#ifdef CONFIG_SYSCTL
+	brnf_sysctl_header = register_sysctl_table(brnf_net_table);
+	if (brnf_sysctl_header == NULL) {
+		printk(KERN_WARNING
+		       "br_netfilter: can't register to sysctl.\n");
+		nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops));
+		return -ENOMEM;
+	}
+#endif
+	printk(KERN_NOTICE "Bridge firewalling registered\n");
+	return 0;
+}
+
+void br_netfilter_fini(void)
+{
+	nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops));
+#ifdef CONFIG_SYSCTL
+	unregister_sysctl_table(brnf_sysctl_header);
+#endif
+}

net/bridge/br_netlink.c

@@ -0,0 +1,196 @@
+/*
+ *	Bridge netlink control interface
+ *
+ *	Authors:
+ *	Stephen Hemminger		<shemminger@osdl.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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/rtnetlink.h>
+#include <net/netlink.h>
+#include "br_private.h"
+
+static inline size_t br_nlmsg_size(void)
+{
+	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
+	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
+	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
+	       + nla_total_size(4) /* IFLA_MASTER */
+	       + nla_total_size(4) /* IFLA_MTU */
+	       + nla_total_size(4) /* IFLA_LINK */
+	       + nla_total_size(1) /* IFLA_OPERSTATE */
+	       + nla_total_size(1); /* IFLA_PROTINFO */
+}
+
+/*
+ * Create one netlink message for one interface
+ * Contains port and master info as well as carrier and bridge state.
+ */
+static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port,
+			  u32 pid, u32 seq, int event, unsigned int flags)
+{
+	const struct net_bridge *br = port->br;
+	const struct net_device *dev = port->dev;
+	struct ifinfomsg *hdr;
+	struct nlmsghdr *nlh;
+	u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
+
+	pr_debug("br_fill_info event %d port %s master %s\n",
+		 event, dev->name, br->dev->name);
+
+	nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
+	if (nlh == NULL)
+		return -EMSGSIZE;
+
+	hdr = nlmsg_data(nlh);
+	hdr->ifi_family = AF_BRIDGE;
+	hdr->__ifi_pad = 0;
+	hdr->ifi_type = dev->type;
+	hdr->ifi_index = dev->ifindex;
+	hdr->ifi_flags = dev_get_flags(dev);
+	hdr->ifi_change = 0;
+
+	NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
+	NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex);
+	NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
+	NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate);
+
+	if (dev->addr_len)
+		NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
+
+	if (dev->ifindex != dev->iflink)
+		NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
+
+	if (event == RTM_NEWLINK)
+		NLA_PUT_U8(skb, IFLA_PROTINFO, port->state);
+
+	return nlmsg_end(skb, nlh);
+
+nla_put_failure:
+	nlmsg_cancel(skb, nlh);
+	return -EMSGSIZE;
+}
+
+/*
+ * Notify listeners of a change in port information
+ */
+void br_ifinfo_notify(int event, struct net_bridge_port *port)
+{
+	struct sk_buff *skb;
+	int err = -ENOBUFS;
+
+	pr_debug("bridge notify event=%d\n", event);
+	skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
+	if (skb == NULL)
+		goto errout;
+
+	err = br_fill_ifinfo(skb, port, 0, 0, event, 0);
+	if (err < 0) {
+		/* -EMSGSIZE implies BUG in br_nlmsg_size() */
+		WARN_ON(err == -EMSGSIZE);
+		kfree_skb(skb);
+		goto errout;
+	}
+	err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
+errout:
+	if (err < 0)
+		rtnl_set_sk_err(RTNLGRP_LINK, err);
+}
+
+/*
+ * Dump information about all ports, in response to GETLINK
+ */
+static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct net_device *dev;
+	int idx;
+
+	read_lock(&dev_base_lock);
+	for (dev = dev_base, idx = 0; dev; dev = dev->next) {
+		/* not a bridge port */
+		if (dev->br_port == NULL || idx < cb->args[0])
+			goto skip;
+
+		if (br_fill_ifinfo(skb, dev->br_port, NETLINK_CB(cb->skb).pid,
+				   cb->nlh->nlmsg_seq, RTM_NEWLINK,
+				   NLM_F_MULTI) < 0)
+			break;
+skip:
+		++idx;
+	}
+	read_unlock(&dev_base_lock);
+
+	cb->args[0] = idx;
+
+	return skb->len;
+}
+
+/*
+ * Change state of port (ie from forwarding to blocking etc)
+ * Used by spanning tree in user space.
+ */
+static int br_rtm_setlink(struct sk_buff *skb,  struct nlmsghdr *nlh, void *arg)
+{
+	struct ifinfomsg *ifm;
+	struct nlattr *protinfo;
+	struct net_device *dev;
+	struct net_bridge_port *p;
+	u8 new_state;
+
+	if (nlmsg_len(nlh) < sizeof(*ifm))
+		return -EINVAL;
+
+	ifm = nlmsg_data(nlh);
+	if (ifm->ifi_family != AF_BRIDGE)
+		return -EPFNOSUPPORT;
+
+	protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
+	if (!protinfo || nla_len(protinfo) < sizeof(u8))
+		return -EINVAL;
+
+	new_state = nla_get_u8(protinfo);
+	if (new_state > BR_STATE_BLOCKING)
+		return -EINVAL;
+
+	dev = __dev_get_by_index(ifm->ifi_index);
+	if (!dev)
+		return -ENODEV;
+
+	p = dev->br_port;
+	if (!p)
+		return -EINVAL;
+
+	/* if kernel STP is running, don't allow changes */
+	if (p->br->stp_enabled)
+		return -EBUSY;
+
+	if (!netif_running(dev) ||
+	    (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED))
+		return -ENETDOWN;
+
+	p->state = new_state;
+	br_log_state(p);
+	return 0;
+}
+
+
+static struct rtnetlink_link bridge_rtnetlink_table[RTM_NR_MSGTYPES] = {
+	[RTM_GETLINK - RTM_BASE] = { .dumpit	= br_dump_ifinfo, },
+	[RTM_SETLINK - RTM_BASE] = { .doit      = br_rtm_setlink, },
+};
+
+void __init br_netlink_init(void)
+{
+	rtnetlink_links[PF_BRIDGE] = bridge_rtnetlink_table;
+}
+
+void __exit br_netlink_fini(void)
+{
+	rtnetlink_links[PF_BRIDGE] = NULL;
+}
+

net/bridge/br_notify.c

@@ -0,0 +1,89 @@
+/*
+ *	Device event handling
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_notify.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
+ *
+ *	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/kernel.h>
+#include <linux/rtnetlink.h>
+
+#include "br_private.h"
+
+static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr);
+
+struct notifier_block br_device_notifier = {
+	.notifier_call = br_device_event
+};
+
+/*
+ * Handle changes in state of network devices enslaved to a bridge.
+ *
+ * Note: don't care about up/down if bridge itself is down, because
+ *     port state is checked when bridge is brought up.
+ */
+static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
+{
+	struct net_device *dev = ptr;
+	struct net_bridge_port *p = dev->br_port;
+	struct net_bridge *br;
+
+	/* not a port of a bridge */
+	if (p == NULL)
+		return NOTIFY_DONE;
+
+	br = p->br;
+
+	switch (event) {
+	case NETDEV_CHANGEMTU:
+		dev_set_mtu(br->dev, br_min_mtu(br));
+		break;
+
+	case NETDEV_CHANGEADDR:
+		spin_lock_bh(&br->lock);
+		br_fdb_changeaddr(p, dev->dev_addr);
+		br_ifinfo_notify(RTM_NEWLINK, p);
+		br_stp_recalculate_bridge_id(br);
+		spin_unlock_bh(&br->lock);
+		break;
+
+	case NETDEV_CHANGE:
+		br_port_carrier_check(p);
+		break;
+
+	case NETDEV_FEAT_CHANGE:
+		spin_lock_bh(&br->lock);
+		if (netif_running(br->dev))
+			br_features_recompute(br);
+		spin_unlock_bh(&br->lock);
+		break;
+
+	case NETDEV_DOWN:
+		spin_lock_bh(&br->lock);
+		if (br->dev->flags & IFF_UP)
+			br_stp_disable_port(p);
+		spin_unlock_bh(&br->lock);
+		break;
+
+	case NETDEV_UP:
+		spin_lock_bh(&br->lock);
+		if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP))
+			br_stp_enable_port(p);
+		spin_unlock_bh(&br->lock);
+		break;
+
+	case NETDEV_UNREGISTER:
+		br_del_if(br, dev);
+		break;
+	}
+
+	return NOTIFY_DONE;
+}

net/bridge/br_private.h

@@ -0,0 +1,258 @@
+/*
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_private.h,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
+ *
+ *	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.
+ */
+
+#ifndef _BR_PRIVATE_H
+#define _BR_PRIVATE_H
+
+#include <linux/netdevice.h>
+#include <linux/if_bridge.h>
+
+#define BR_HASH_BITS 8
+#define BR_HASH_SIZE (1 << BR_HASH_BITS)
+
+#define BR_HOLD_TIME (1*HZ)
+
+#define BR_PORT_BITS	10
+#define BR_MAX_PORTS	(1<<BR_PORT_BITS)
+
+#define BR_VERSION	"2.2"
+
+typedef struct bridge_id bridge_id;
+typedef struct mac_addr mac_addr;
+typedef __u16 port_id;
+
+struct bridge_id
+{
+	unsigned char	prio[2];
+	unsigned char	addr[6];
+};
+
+struct mac_addr
+{
+	unsigned char	addr[6];
+};
+
+struct net_bridge_fdb_entry
+{
+	struct hlist_node		hlist;
+	struct net_bridge_port		*dst;
+
+	struct rcu_head			rcu;
+	atomic_t			use_count;
+	unsigned long			ageing_timer;
+	mac_addr			addr;
+	unsigned char			is_local;
+	unsigned char			is_static;
+};
+
+struct net_bridge_port
+{
+	struct net_bridge		*br;
+	struct net_device		*dev;
+	struct list_head		list;
+
+	/* STP */
+	u8				priority;
+	u8				state;
+	u16				port_no;
+	unsigned char			topology_change_ack;
+	unsigned char			config_pending;
+	port_id				port_id;
+	port_id				designated_port;
+	bridge_id			designated_root;
+	bridge_id			designated_bridge;
+	u32				path_cost;
+	u32				designated_cost;
+
+	struct timer_list		forward_delay_timer;
+	struct timer_list		hold_timer;
+	struct timer_list		message_age_timer;
+	struct kobject			kobj;
+	struct rcu_head			rcu;
+};
+
+struct net_bridge
+{
+	spinlock_t			lock;
+	struct list_head		port_list;
+	struct net_device		*dev;
+	struct net_device_stats		statistics;
+	spinlock_t			hash_lock;
+	struct hlist_head		hash[BR_HASH_SIZE];
+	struct list_head		age_list;
+	unsigned long			feature_mask;
+
+	/* STP */
+	bridge_id			designated_root;
+	bridge_id			bridge_id;
+	u32				root_path_cost;
+	unsigned long			max_age;
+	unsigned long			hello_time;
+	unsigned long			forward_delay;
+	unsigned long			bridge_max_age;
+	unsigned long			ageing_time;
+	unsigned long			bridge_hello_time;
+	unsigned long			bridge_forward_delay;
+
+	u8				group_addr[ETH_ALEN];
+	u16				root_port;
+	unsigned char			stp_enabled;
+	unsigned char			topology_change;
+	unsigned char			topology_change_detected;
+
+	struct timer_list		hello_timer;
+	struct timer_list		tcn_timer;
+	struct timer_list		topology_change_timer;
+	struct timer_list		gc_timer;
+	struct kobject			ifobj;
+};
+
+extern struct notifier_block br_device_notifier;
+extern const u8 br_group_address[ETH_ALEN];
+
+/* called under bridge lock */
+static inline int br_is_root_bridge(const struct net_bridge *br)
+{
+	return !memcmp(&br->bridge_id, &br->designated_root, 8);
+}
+
+
+/* br_device.c */
+extern void br_dev_setup(struct net_device *dev);
+extern int br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
+
+/* br_fdb.c */
+extern void br_fdb_init(void);
+extern void br_fdb_fini(void);
+extern void br_fdb_changeaddr(struct net_bridge_port *p,
+			      const unsigned char *newaddr);
+extern void br_fdb_cleanup(unsigned long arg);
+extern void br_fdb_delete_by_port(struct net_bridge *br,
+				  const struct net_bridge_port *p, int do_all);
+extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
+						 const unsigned char *addr);
+extern struct net_bridge_fdb_entry *br_fdb_get(struct net_bridge *br,
+					       unsigned char *addr);
+extern void br_fdb_put(struct net_bridge_fdb_entry *ent);
+extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
+			  unsigned long count, unsigned long off);
+extern int br_fdb_insert(struct net_bridge *br,
+			 struct net_bridge_port *source,
+			 const unsigned char *addr);
+extern void br_fdb_update(struct net_bridge *br,
+			  struct net_bridge_port *source,
+			  const unsigned char *addr);
+
+/* br_forward.c */
+extern void br_deliver(const struct net_bridge_port *to,
+		struct sk_buff *skb);
+extern int br_dev_queue_push_xmit(struct sk_buff *skb);
+extern void br_forward(const struct net_bridge_port *to,
+		struct sk_buff *skb);
+extern int br_forward_finish(struct sk_buff *skb);
+extern void br_flood_deliver(struct net_bridge *br,
+		      struct sk_buff *skb,
+		      int clone);
+extern void br_flood_forward(struct net_bridge *br,
+		      struct sk_buff *skb,
+		      int clone);
+
+/* br_if.c */
+extern void br_port_carrier_check(struct net_bridge_port *p);
+extern int br_add_bridge(const char *name);
+extern int br_del_bridge(const char *name);
+extern void br_cleanup_bridges(void);
+extern int br_add_if(struct net_bridge *br,
+	      struct net_device *dev);
+extern int br_del_if(struct net_bridge *br,
+	      struct net_device *dev);
+extern int br_min_mtu(const struct net_bridge *br);
+extern void br_features_recompute(struct net_bridge *br);
+
+/* br_input.c */
+extern int br_handle_frame_finish(struct sk_buff *skb);
+extern int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb);
+
+/* br_ioctl.c */
+extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
+extern int br_ioctl_deviceless_stub(unsigned int cmd, void __user *arg);
+
+/* br_netfilter.c */
+#ifdef CONFIG_BRIDGE_NETFILTER
+extern int br_netfilter_init(void);
+extern void br_netfilter_fini(void);
+#else
+#define br_netfilter_init()	(0)
+#define br_netfilter_fini()	do { } while(0)
+#endif
+
+/* br_stp.c */
+extern void br_log_state(const struct net_bridge_port *p);
+extern struct net_bridge_port *br_get_port(struct net_bridge *br,
+					   u16 port_no);
+extern void br_init_port(struct net_bridge_port *p);
+extern void br_become_designated_port(struct net_bridge_port *p);
+
+/* br_stp_if.c */
+extern void br_stp_enable_bridge(struct net_bridge *br);
+extern void br_stp_disable_bridge(struct net_bridge *br);
+extern void br_stp_enable_port(struct net_bridge_port *p);
+extern void br_stp_disable_port(struct net_bridge_port *p);
+extern void br_stp_recalculate_bridge_id(struct net_bridge *br);
+extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
+extern void br_stp_set_bridge_priority(struct net_bridge *br,
+				       u16 newprio);
+extern void br_stp_set_port_priority(struct net_bridge_port *p,
+				     u8 newprio);
+extern void br_stp_set_path_cost(struct net_bridge_port *p,
+				 u32 path_cost);
+extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
+
+/* br_stp_bpdu.c */
+extern int br_stp_rcv(struct sk_buff *skb, struct net_device *dev,
+		      struct packet_type *pt, struct net_device *orig_dev);
+
+/* br_stp_timer.c */
+extern void br_stp_timer_init(struct net_bridge *br);
+extern void br_stp_port_timer_init(struct net_bridge_port *p);
+extern unsigned long br_timer_value(const struct timer_list *timer);
+
+/* br.c */
+extern struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
+						       unsigned char *addr);
+extern void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
+
+
+/* br_netlink.c */
+extern void br_netlink_init(void);
+extern void br_netlink_fini(void);
+extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
+
+#ifdef CONFIG_SYSFS
+/* br_sysfs_if.c */
+extern struct sysfs_ops brport_sysfs_ops;
+extern int br_sysfs_addif(struct net_bridge_port *p);
+
+/* br_sysfs_br.c */
+extern int br_sysfs_addbr(struct net_device *dev);
+extern void br_sysfs_delbr(struct net_device *dev);
+
+#else
+
+#define br_sysfs_addif(p)	(0)
+#define br_sysfs_addbr(dev)	(0)
+#define br_sysfs_delbr(dev)	do { } while(0)
+#endif /* CONFIG_SYSFS */
+
+#endif

net/bridge/br_private_stp.h

@@ -0,0 +1,58 @@
+/*
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_private_stp.h,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
+ *
+ *	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.
+ */
+
+#ifndef _BR_PRIVATE_STP_H
+#define _BR_PRIVATE_STP_H
+
+#define BPDU_TYPE_CONFIG 0
+#define BPDU_TYPE_TCN 0x80
+
+struct br_config_bpdu
+{
+	unsigned	topology_change:1;
+	unsigned	topology_change_ack:1;
+	bridge_id	root;
+	int		root_path_cost;
+	bridge_id	bridge_id;
+	port_id		port_id;
+	int		message_age;
+	int		max_age;
+	int		hello_time;
+	int		forward_delay;
+};
+
+/* called under bridge lock */
+static inline int br_is_designated_port(const struct net_bridge_port *p)
+{
+	return !memcmp(&p->designated_bridge, &p->br->bridge_id, 8) &&
+		(p->designated_port == p->port_id);
+}
+
+
+/* br_stp.c */
+extern void br_become_root_bridge(struct net_bridge *br);
+extern void br_config_bpdu_generation(struct net_bridge *);
+extern void br_configuration_update(struct net_bridge *);
+extern void br_port_state_selection(struct net_bridge *);
+extern void br_received_config_bpdu(struct net_bridge_port *p, struct br_config_bpdu *bpdu);
+extern void br_received_tcn_bpdu(struct net_bridge_port *p);
+extern void br_transmit_config(struct net_bridge_port *p);
+extern void br_transmit_tcn(struct net_bridge *br);
+extern void br_topology_change_detection(struct net_bridge *br);
+
+/* br_stp_bpdu.c */
+extern void br_send_config_bpdu(struct net_bridge_port *, struct br_config_bpdu *);
+extern void br_send_tcn_bpdu(struct net_bridge_port *);
+
+#endif

net/bridge/br_stp.c

@@ -0,0 +1,459 @@
+/*
+ *	Spanning tree protocol; generic parts
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_stp.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
+ *
+ *	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/kernel.h>
+#include <linux/smp_lock.h>
+
+#include "br_private.h"
+#include "br_private_stp.h"
+
+/* since time values in bpdu are in jiffies and then scaled (1/256)
+ * before sending, make sure that is at least one.
+ */
+#define MESSAGE_AGE_INCR	((HZ < 256) ? 1 : (HZ/256))
+
+static const char *br_port_state_names[] = {
+	[BR_STATE_DISABLED] = "disabled",
+	[BR_STATE_LISTENING] = "listening",
+	[BR_STATE_LEARNING] = "learning",
+	[BR_STATE_FORWARDING] = "forwarding",
+	[BR_STATE_BLOCKING] = "blocking",
+};
+
+void br_log_state(const struct net_bridge_port *p)
+{
+	pr_info("%s: port %d(%s) entering %s state\n",
+		p->br->dev->name, p->port_no, p->dev->name,
+		br_port_state_names[p->state]);
+
+}
+
+/* called under bridge lock */
+struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no)
+{
+	struct net_bridge_port *p;
+
+	list_for_each_entry_rcu(p, &br->port_list, list) {
+		if (p->port_no == port_no)
+			return p;
+	}
+
+	return NULL;
+}
+
+/* called under bridge lock */
+static int br_should_become_root_port(const struct net_bridge_port *p,
+				      u16 root_port)
+{
+	struct net_bridge *br;
+	struct net_bridge_port *rp;
+	int t;
+
+	br = p->br;
+	if (p->state == BR_STATE_DISABLED ||
+	    br_is_designated_port(p))
+		return 0;
+
+	if (memcmp(&br->bridge_id, &p->designated_root, 8) <= 0)
+		return 0;
+
+	if (!root_port)
+		return 1;
+
+	rp = br_get_port(br, root_port);
+
+	t = memcmp(&p->designated_root, &rp->designated_root, 8);
+	if (t < 0)
+		return 1;
+	else if (t > 0)
+		return 0;
+
+	if (p->designated_cost + p->path_cost <
+	    rp->designated_cost + rp->path_cost)
+		return 1;
+	else if (p->designated_cost + p->path_cost >
+		 rp->designated_cost + rp->path_cost)
+		return 0;
+
+	t = memcmp(&p->designated_bridge, &rp->designated_bridge, 8);
+	if (t < 0)
+		return 1;
+	else if (t > 0)
+		return 0;
+
+	if (p->designated_port < rp->designated_port)
+		return 1;
+	else if (p->designated_port > rp->designated_port)
+		return 0;
+
+	if (p->port_id < rp->port_id)
+		return 1;
+
+	return 0;
+}
+
+/* called under bridge lock */
+static void br_root_selection(struct net_bridge *br)
+{
+	struct net_bridge_port *p;
+	u16 root_port = 0;
+
+	list_for_each_entry(p, &br->port_list, list) {
+		if (br_should_become_root_port(p, root_port))
+			root_port = p->port_no;
+
+	}
+
+	br->root_port = root_port;
+
+	if (!root_port) {
+		br->designated_root = br->bridge_id;
+		br->root_path_cost = 0;
+	} else {
+		p = br_get_port(br, root_port);
+		br->designated_root = p->designated_root;
+		br->root_path_cost = p->designated_cost + p->path_cost;
+	}
+}
+
+/* called under bridge lock */
+void br_become_root_bridge(struct net_bridge *br)
+{
+	br->max_age = br->bridge_max_age;
+	br->hello_time = br->bridge_hello_time;
+	br->forward_delay = br->bridge_forward_delay;
+	br_topology_change_detection(br);
+	del_timer(&br->tcn_timer);
+
+	if (br->dev->flags & IFF_UP) {
+		br_config_bpdu_generation(br);
+		mod_timer(&br->hello_timer, jiffies + br->hello_time);
+	}
+}
+
+/* called under bridge lock */
+void br_transmit_config(struct net_bridge_port *p)
+{
+	struct br_config_bpdu bpdu;
+	struct net_bridge *br;
+
+
+	if (timer_pending(&p->hold_timer)) {
+		p->config_pending = 1;
+		return;
+	}
+
+	br = p->br;
+
+	bpdu.topology_change = br->topology_change;
+	bpdu.topology_change_ack = p->topology_change_ack;
+	bpdu.root = br->designated_root;
+	bpdu.root_path_cost = br->root_path_cost;
+	bpdu.bridge_id = br->bridge_id;
+	bpdu.port_id = p->port_id;
+	if (br_is_root_bridge(br))
+		bpdu.message_age = 0;
+	else {
+		struct net_bridge_port *root
+			= br_get_port(br, br->root_port);
+		bpdu.message_age = br->max_age
+			- (root->message_age_timer.expires - jiffies)
+			+ MESSAGE_AGE_INCR;
+	}
+	bpdu.max_age = br->max_age;
+	bpdu.hello_time = br->hello_time;
+	bpdu.forward_delay = br->forward_delay;
+
+	if (bpdu.message_age < br->max_age) {
+		br_send_config_bpdu(p, &bpdu);
+		p->topology_change_ack = 0;
+		p->config_pending = 0;
+		mod_timer(&p->hold_timer, jiffies + BR_HOLD_TIME);
+	}
+}
+
+/* called under bridge lock */
+static inline void br_record_config_information(struct net_bridge_port *p,
+						const struct br_config_bpdu *bpdu)
+{
+	p->designated_root = bpdu->root;
+	p->designated_cost = bpdu->root_path_cost;
+	p->designated_bridge = bpdu->bridge_id;
+	p->designated_port = bpdu->port_id;
+
+	mod_timer(&p->message_age_timer, jiffies
+		  + (p->br->max_age - bpdu->message_age));
+}
+
+/* called under bridge lock */
+static inline void br_record_config_timeout_values(struct net_bridge *br,
+					    const struct br_config_bpdu *bpdu)
+{
+	br->max_age = bpdu->max_age;
+	br->hello_time = bpdu->hello_time;
+	br->forward_delay = bpdu->forward_delay;
+	br->topology_change = bpdu->topology_change;
+}
+
+/* called under bridge lock */
+void br_transmit_tcn(struct net_bridge *br)
+{
+	br_send_tcn_bpdu(br_get_port(br, br->root_port));
+}
+
+/* called under bridge lock */
+static int br_should_become_designated_port(const struct net_bridge_port *p)
+{
+	struct net_bridge *br;
+	int t;
+
+	br = p->br;
+	if (br_is_designated_port(p))
+		return 1;
+
+	if (memcmp(&p->designated_root, &br->designated_root, 8))
+		return 1;
+
+	if (br->root_path_cost < p->designated_cost)
+		return 1;
+	else if (br->root_path_cost > p->designated_cost)
+		return 0;
+
+	t = memcmp(&br->bridge_id, &p->designated_bridge, 8);
+	if (t < 0)
+		return 1;
+	else if (t > 0)
+		return 0;
+
+	if (p->port_id < p->designated_port)
+		return 1;
+
+	return 0;
+}
+
+/* called under bridge lock */
+static void br_designated_port_selection(struct net_bridge *br)
+{
+	struct net_bridge_port *p;
+
+	list_for_each_entry(p, &br->port_list, list) {
+		if (p->state != BR_STATE_DISABLED &&
+		    br_should_become_designated_port(p))
+			br_become_designated_port(p);
+
+	}
+}
+
+/* called under bridge lock */
+static int br_supersedes_port_info(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
+{
+	int t;
+
+	t = memcmp(&bpdu->root, &p->designated_root, 8);
+	if (t < 0)
+		return 1;
+	else if (t > 0)
+		return 0;
+
+	if (bpdu->root_path_cost < p->designated_cost)
+		return 1;
+	else if (bpdu->root_path_cost > p->designated_cost)
+		return 0;
+
+	t = memcmp(&bpdu->bridge_id, &p->designated_bridge, 8);
+	if (t < 0)
+		return 1;
+	else if (t > 0)
+		return 0;
+
+	if (memcmp(&bpdu->bridge_id, &p->br->bridge_id, 8))
+		return 1;
+
+	if (bpdu->port_id <= p->designated_port)
+		return 1;
+
+	return 0;
+}
+
+/* called under bridge lock */
+static inline void br_topology_change_acknowledged(struct net_bridge *br)
+{
+	br->topology_change_detected = 0;
+	del_timer(&br->tcn_timer);
+}
+
+/* called under bridge lock */
+void br_topology_change_detection(struct net_bridge *br)
+{
+	int isroot = br_is_root_bridge(br);
+
+	pr_info("%s: topology change detected, %s\n", br->dev->name,
+		isroot ? "propagating" : "sending tcn bpdu");
+
+	if (isroot) {
+		br->topology_change = 1;
+		mod_timer(&br->topology_change_timer, jiffies
+			  + br->bridge_forward_delay + br->bridge_max_age);
+	} else if (!br->topology_change_detected) {
+		br_transmit_tcn(br);
+		mod_timer(&br->tcn_timer, jiffies + br->bridge_hello_time);
+	}
+
+	br->topology_change_detected = 1;
+}
+
+/* called under bridge lock */
+void br_config_bpdu_generation(struct net_bridge *br)
+{
+	struct net_bridge_port *p;
+
+	list_for_each_entry(p, &br->port_list, list) {
+		if (p->state != BR_STATE_DISABLED &&
+		    br_is_designated_port(p))
+			br_transmit_config(p);
+	}
+}
+
+/* called under bridge lock */
+static inline void br_reply(struct net_bridge_port *p)
+{
+	br_transmit_config(p);
+}
+
+/* called under bridge lock */
+void br_configuration_update(struct net_bridge *br)
+{
+	br_root_selection(br);
+	br_designated_port_selection(br);
+}
+
+/* called under bridge lock */
+void br_become_designated_port(struct net_bridge_port *p)
+{
+	struct net_bridge *br;
+
+	br = p->br;
+	p->designated_root = br->designated_root;
+	p->designated_cost = br->root_path_cost;
+	p->designated_bridge = br->bridge_id;
+	p->designated_port = p->port_id;
+}
+
+
+/* called under bridge lock */
+static void br_make_blocking(struct net_bridge_port *p)
+{
+	if (p->state != BR_STATE_DISABLED &&
+	    p->state != BR_STATE_BLOCKING) {
+		if (p->state == BR_STATE_FORWARDING ||
+		    p->state == BR_STATE_LEARNING)
+			br_topology_change_detection(p->br);
+
+		p->state = BR_STATE_BLOCKING;
+		br_log_state(p);
+		del_timer(&p->forward_delay_timer);
+	}
+}
+
+/* called under bridge lock */
+static void br_make_forwarding(struct net_bridge_port *p)
+{
+	if (p->state == BR_STATE_BLOCKING) {
+		if (p->br->stp_enabled) {
+			p->state = BR_STATE_LISTENING;
+		} else {
+			p->state = BR_STATE_LEARNING;
+		}
+		br_log_state(p);
+		mod_timer(&p->forward_delay_timer, jiffies + p->br->forward_delay);	}
+}
+
+/* called under bridge lock */
+void br_port_state_selection(struct net_bridge *br)
+{
+	struct net_bridge_port *p;
+
+	list_for_each_entry(p, &br->port_list, list) {
+		if (p->state != BR_STATE_DISABLED) {
+			if (p->port_no == br->root_port) {
+				p->config_pending = 0;
+				p->topology_change_ack = 0;
+				br_make_forwarding(p);
+			} else if (br_is_designated_port(p)) {
+				del_timer(&p->message_age_timer);
+				br_make_forwarding(p);
+			} else {
+				p->config_pending = 0;
+				p->topology_change_ack = 0;
+				br_make_blocking(p);
+			}
+		}
+
+	}
+}
+
+/* called under bridge lock */
+static inline void br_topology_change_acknowledge(struct net_bridge_port *p)
+{
+	p->topology_change_ack = 1;
+	br_transmit_config(p);
+}
+
+/* called under bridge lock */
+void br_received_config_bpdu(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
+{
+	struct net_bridge *br;
+	int was_root;
+
+	br = p->br;
+	was_root = br_is_root_bridge(br);
+
+	if (br_supersedes_port_info(p, bpdu)) {
+		br_record_config_information(p, bpdu);
+		br_configuration_update(br);
+		br_port_state_selection(br);
+
+		if (!br_is_root_bridge(br) && was_root) {
+			del_timer(&br->hello_timer);
+			if (br->topology_change_detected) {
+				del_timer(&br->topology_change_timer);
+				br_transmit_tcn(br);
+
+				mod_timer(&br->tcn_timer,
+					  jiffies + br->bridge_hello_time);
+			}
+		}
+
+		if (p->port_no == br->root_port) {
+			br_record_config_timeout_values(br, bpdu);
+			br_config_bpdu_generation(br);
+			if (bpdu->topology_change_ack)
+				br_topology_change_acknowledged(br);
+		}
+	} else if (br_is_designated_port(p)) {
+		br_reply(p);
+	}
+}
+
+/* called under bridge lock */
+void br_received_tcn_bpdu(struct net_bridge_port *p)
+{
+	if (br_is_designated_port(p)) {
+		pr_info("%s: received tcn bpdu on port %i(%s)\n",
+		       p->br->dev->name, p->port_no, p->dev->name);
+
+		br_topology_change_detection(p->br);
+		br_topology_change_acknowledge(p);
+	}
+}

net/bridge/br_stp_bpdu.c

@@ -0,0 +1,219 @@
+/*
+ *	Spanning tree protocol; BPDU handling
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_stp_bpdu.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
+ *
+ *	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/kernel.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/etherdevice.h>
+#include <linux/llc.h>
+#include <net/llc.h>
+#include <net/llc_pdu.h>
+#include <asm/unaligned.h>
+
+#include "br_private.h"
+#include "br_private_stp.h"
+
+#define STP_HZ		256
+
+#define LLC_RESERVE sizeof(struct llc_pdu_un)
+
+static void br_send_bpdu(struct net_bridge_port *p,
+			 const unsigned char *data, int length)
+{
+	struct sk_buff *skb;
+
+	if (!p->br->stp_enabled)
+		return;
+
+	skb = dev_alloc_skb(length+LLC_RESERVE);
+	if (!skb)
+		return;
+
+	skb->dev = p->dev;
+	skb->protocol = htons(ETH_P_802_2);
+
+	skb_reserve(skb, LLC_RESERVE);
+	memcpy(__skb_put(skb, length), data, length);
+
+	llc_pdu_header_init(skb, LLC_PDU_TYPE_U, LLC_SAP_BSPAN,
+			    LLC_SAP_BSPAN, LLC_PDU_CMD);
+	llc_pdu_init_as_ui_cmd(skb);
+
+	llc_mac_hdr_init(skb, p->dev->dev_addr, p->br->group_addr);
+
+	NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
+		dev_queue_xmit);
+}
+
+static inline void br_set_ticks(unsigned char *dest, int j)
+{
+	unsigned long ticks = (STP_HZ * j)/ HZ;
+
+	put_unaligned(htons(ticks), (__be16 *)dest);
+}
+
+static inline int br_get_ticks(const unsigned char *src)
+{
+	unsigned long ticks = ntohs(get_unaligned((__be16 *)src));
+
+	return (ticks * HZ + STP_HZ - 1) / STP_HZ;
+}
+
+/* called under bridge lock */
+void br_send_config_bpdu(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
+{
+	unsigned char buf[35];
+
+	buf[0] = 0;
+	buf[1] = 0;
+	buf[2] = 0;
+	buf[3] = BPDU_TYPE_CONFIG;
+	buf[4] = (bpdu->topology_change ? 0x01 : 0) |
+		(bpdu->topology_change_ack ? 0x80 : 0);
+	buf[5] = bpdu->root.prio[0];
+	buf[6] = bpdu->root.prio[1];
+	buf[7] = bpdu->root.addr[0];
+	buf[8] = bpdu->root.addr[1];
+	buf[9] = bpdu->root.addr[2];
+	buf[10] = bpdu->root.addr[3];
+	buf[11] = bpdu->root.addr[4];
+	buf[12] = bpdu->root.addr[5];
+	buf[13] = (bpdu->root_path_cost >> 24) & 0xFF;
+	buf[14] = (bpdu->root_path_cost >> 16) & 0xFF;
+	buf[15] = (bpdu->root_path_cost >> 8) & 0xFF;
+	buf[16] = bpdu->root_path_cost & 0xFF;
+	buf[17] = bpdu->bridge_id.prio[0];
+	buf[18] = bpdu->bridge_id.prio[1];
+	buf[19] = bpdu->bridge_id.addr[0];
+	buf[20] = bpdu->bridge_id.addr[1];
+	buf[21] = bpdu->bridge_id.addr[2];
+	buf[22] = bpdu->bridge_id.addr[3];
+	buf[23] = bpdu->bridge_id.addr[4];
+	buf[24] = bpdu->bridge_id.addr[5];
+	buf[25] = (bpdu->port_id >> 8) & 0xFF;
+	buf[26] = bpdu->port_id & 0xFF;
+
+	br_set_ticks(buf+27, bpdu->message_age);
+	br_set_ticks(buf+29, bpdu->max_age);
+	br_set_ticks(buf+31, bpdu->hello_time);
+	br_set_ticks(buf+33, bpdu->forward_delay);
+
+	br_send_bpdu(p, buf, 35);
+}
+
+/* called under bridge lock */
+void br_send_tcn_bpdu(struct net_bridge_port *p)
+{
+	unsigned char buf[4];
+
+	buf[0] = 0;
+	buf[1] = 0;
+	buf[2] = 0;
+	buf[3] = BPDU_TYPE_TCN;
+	br_send_bpdu(p, buf, 4);
+}
+
+/*
+ * Called from llc.
+ *
+ * NO locks, but rcu_read_lock (preempt_disabled)
+ */
+int br_stp_rcv(struct sk_buff *skb, struct net_device *dev,
+	       struct packet_type *pt, struct net_device *orig_dev)
+{
+	const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
+	const unsigned char *dest = eth_hdr(skb)->h_dest;
+	struct net_bridge_port *p = rcu_dereference(dev->br_port);
+	struct net_bridge *br;
+	const unsigned char *buf;
+
+	if (!p)
+		goto err;
+
+	if (pdu->ssap != LLC_SAP_BSPAN
+	    || pdu->dsap != LLC_SAP_BSPAN
+	    || pdu->ctrl_1 != LLC_PDU_TYPE_U)
+		goto err;
+
+	if (!pskb_may_pull(skb, 4))
+		goto err;
+
+	/* compare of protocol id and version */
+	buf = skb->data;
+	if (buf[0] != 0 || buf[1] != 0 || buf[2] != 0)
+		goto err;
+
+	br = p->br;
+	spin_lock(&br->lock);
+
+	if (p->state == BR_STATE_DISABLED
+	    || !br->stp_enabled
+	    || !(br->dev->flags & IFF_UP))
+		goto out;
+
+	if (compare_ether_addr(dest, br->group_addr) != 0)
+		goto out;
+
+	buf = skb_pull(skb, 3);
+
+	if (buf[0] == BPDU_TYPE_CONFIG) {
+		struct br_config_bpdu bpdu;
+
+		if (!pskb_may_pull(skb, 32))
+			goto out;
+
+		buf = skb->data;
+		bpdu.topology_change = (buf[1] & 0x01) ? 1 : 0;
+		bpdu.topology_change_ack = (buf[1] & 0x80) ? 1 : 0;
+
+		bpdu.root.prio[0] = buf[2];
+		bpdu.root.prio[1] = buf[3];
+		bpdu.root.addr[0] = buf[4];
+		bpdu.root.addr[1] = buf[5];
+		bpdu.root.addr[2] = buf[6];
+		bpdu.root.addr[3] = buf[7];
+		bpdu.root.addr[4] = buf[8];
+		bpdu.root.addr[5] = buf[9];
+		bpdu.root_path_cost =
+			(buf[10] << 24) |
+			(buf[11] << 16) |
+			(buf[12] << 8) |
+			buf[13];
+		bpdu.bridge_id.prio[0] = buf[14];
+		bpdu.bridge_id.prio[1] = buf[15];
+		bpdu.bridge_id.addr[0] = buf[16];
+		bpdu.bridge_id.addr[1] = buf[17];
+		bpdu.bridge_id.addr[2] = buf[18];
+		bpdu.bridge_id.addr[3] = buf[19];
+		bpdu.bridge_id.addr[4] = buf[20];
+		bpdu.bridge_id.addr[5] = buf[21];
+		bpdu.port_id = (buf[22] << 8) | buf[23];
+
+		bpdu.message_age = br_get_ticks(buf+24);
+		bpdu.max_age = br_get_ticks(buf+26);
+		bpdu.hello_time = br_get_ticks(buf+28);
+		bpdu.forward_delay = br_get_ticks(buf+30);
+
+		br_received_config_bpdu(p, &bpdu);
+	}
+
+	else if (buf[0] == BPDU_TYPE_TCN) {
+		br_received_tcn_bpdu(p);
+	}
+ out:
+	spin_unlock(&br->lock);
+ err:
+	kfree_skb(skb);
+	return 0;
+}

net/bridge/br_stp_if.c

@@ -0,0 +1,234 @@
+/*
+ *	Spanning tree protocol; interface code
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_stp_if.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
+ *
+ *	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/kernel.h>
+#include <linux/smp_lock.h>
+#include <linux/etherdevice.h>
+#include <linux/rtnetlink.h>
+
+#include "br_private.h"
+#include "br_private_stp.h"
+
+
+/* Port id is composed of priority and port number.
+ * NB: least significant bits of priority are dropped to
+ *     make room for more ports.
+ */
+static inline port_id br_make_port_id(__u8 priority, __u16 port_no)
+{
+	return ((u16)priority << BR_PORT_BITS)
+		| (port_no & ((1<<BR_PORT_BITS)-1));
+}
+
+/* called under bridge lock */
+void br_init_port(struct net_bridge_port *p)
+{
+	p->port_id = br_make_port_id(p->priority, p->port_no);
+	br_become_designated_port(p);
+	p->state = BR_STATE_BLOCKING;
+	p->topology_change_ack = 0;
+	p->config_pending = 0;
+}
+
+/* called under bridge lock */
+void br_stp_enable_bridge(struct net_bridge *br)
+{
+	struct net_bridge_port *p;
+
+	spin_lock_bh(&br->lock);
+	mod_timer(&br->hello_timer, jiffies + br->hello_time);
+	mod_timer(&br->gc_timer, jiffies + HZ/10);
+
+	br_config_bpdu_generation(br);
+
+	list_for_each_entry(p, &br->port_list, list) {
+		if ((p->dev->flags & IFF_UP) && netif_carrier_ok(p->dev))
+			br_stp_enable_port(p);
+
+	}
+	spin_unlock_bh(&br->lock);
+}
+
+/* NO locks held */
+void br_stp_disable_bridge(struct net_bridge *br)
+{
+	struct net_bridge_port *p;
+
+	spin_lock_bh(&br->lock);
+	list_for_each_entry(p, &br->port_list, list) {
+		if (p->state != BR_STATE_DISABLED)
+			br_stp_disable_port(p);
+
+	}
+
+	br->topology_change = 0;
+	br->topology_change_detected = 0;
+	spin_unlock_bh(&br->lock);
+
+	del_timer_sync(&br->hello_timer);
+	del_timer_sync(&br->topology_change_timer);
+	del_timer_sync(&br->tcn_timer);
+	del_timer_sync(&br->gc_timer);
+}
+
+/* called under bridge lock */
+void br_stp_enable_port(struct net_bridge_port *p)
+{
+	br_init_port(p);
+	br_ifinfo_notify(RTM_NEWLINK, p);
+	br_port_state_selection(p->br);
+}
+
+/* called under bridge lock */
+void br_stp_disable_port(struct net_bridge_port *p)
+{
+	struct net_bridge *br;
+	int wasroot;
+
+	br = p->br;
+	printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
+	       br->dev->name, p->port_no, p->dev->name, "disabled");
+
+	br_ifinfo_notify(RTM_DELLINK, p);
+
+	wasroot = br_is_root_bridge(br);
+	br_become_designated_port(p);
+	p->state = BR_STATE_DISABLED;
+	p->topology_change_ack = 0;
+	p->config_pending = 0;
+
+	del_timer(&p->message_age_timer);
+	del_timer(&p->forward_delay_timer);
+	del_timer(&p->hold_timer);
+
+	br_fdb_delete_by_port(br, p, 0);
+
+	br_configuration_update(br);
+
+	br_port_state_selection(br);
+
+	if (br_is_root_bridge(br) && !wasroot)
+		br_become_root_bridge(br);
+}
+
+/* called under bridge lock */
+void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr)
+{
+	/* should be aligned on 2 bytes for compare_ether_addr() */
+	unsigned short oldaddr_aligned[ETH_ALEN >> 1];
+	unsigned char *oldaddr = (unsigned char *)oldaddr_aligned;
+	struct net_bridge_port *p;
+	int wasroot;
+
+	wasroot = br_is_root_bridge(br);
+
+	memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN);
+	memcpy(br->bridge_id.addr, addr, ETH_ALEN);
+	memcpy(br->dev->dev_addr, addr, ETH_ALEN);
+
+	list_for_each_entry(p, &br->port_list, list) {
+		if (!compare_ether_addr(p->designated_bridge.addr, oldaddr))
+			memcpy(p->designated_bridge.addr, addr, ETH_ALEN);
+
+		if (!compare_ether_addr(p->designated_root.addr, oldaddr))
+			memcpy(p->designated_root.addr, addr, ETH_ALEN);
+
+	}
+
+	br_configuration_update(br);
+	br_port_state_selection(br);
+	if (br_is_root_bridge(br) && !wasroot)
+		br_become_root_bridge(br);
+}
+
+/* should be aligned on 2 bytes for compare_ether_addr() */
+static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1];
+
+/* called under bridge lock */
+void br_stp_recalculate_bridge_id(struct net_bridge *br)
+{
+	const unsigned char *br_mac_zero =
+			(const unsigned char *)br_mac_zero_aligned;
+	const unsigned char *addr = br_mac_zero;
+	struct net_bridge_port *p;
+
+	list_for_each_entry(p, &br->port_list, list) {
+		if (addr == br_mac_zero ||
+		    memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0)
+			addr = p->dev->dev_addr;
+
+	}
+
+	if (compare_ether_addr(br->bridge_id.addr, addr))
+		br_stp_change_bridge_id(br, addr);
+}
+
+/* called under bridge lock */
+void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio)
+{
+	struct net_bridge_port *p;
+	int wasroot;
+
+	wasroot = br_is_root_bridge(br);
+
+	list_for_each_entry(p, &br->port_list, list) {
+		if (p->state != BR_STATE_DISABLED &&
+		    br_is_designated_port(p)) {
+			p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF;
+			p->designated_bridge.prio[1] = newprio & 0xFF;
+		}
+
+	}
+
+	br->bridge_id.prio[0] = (newprio >> 8) & 0xFF;
+	br->bridge_id.prio[1] = newprio & 0xFF;
+	br_configuration_update(br);
+	br_port_state_selection(br);
+	if (br_is_root_bridge(br) && !wasroot)
+		br_become_root_bridge(br);
+}
+
+/* called under bridge lock */
+void br_stp_set_port_priority(struct net_bridge_port *p, u8 newprio)
+{
+	port_id new_port_id = br_make_port_id(newprio, p->port_no);
+
+	if (br_is_designated_port(p))
+		p->designated_port = new_port_id;
+
+	p->port_id = new_port_id;
+	p->priority = newprio;
+	if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) &&
+	    p->port_id < p->designated_port) {
+		br_become_designated_port(p);
+		br_port_state_selection(p->br);
+	}
+}
+
+/* called under bridge lock */
+void br_stp_set_path_cost(struct net_bridge_port *p, u32 path_cost)
+{
+	p->path_cost = path_cost;
+	br_configuration_update(p->br);
+	br_port_state_selection(p->br);
+}
+
+ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id)
+{
+	return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n",
+	       id->prio[0], id->prio[1],
+	       id->addr[0], id->addr[1], id->addr[2],
+	       id->addr[3], id->addr[4], id->addr[5]);
+}

net/bridge/br_stp_timer.c

@@ -0,0 +1,179 @@
+/*
+ *	Spanning tree protocol; timer-related code
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_stp_timer.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
+ *
+ *	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/kernel.h>
+#include <linux/times.h>
+#include <linux/smp_lock.h>
+
+#include "br_private.h"
+#include "br_private_stp.h"
+
+/* called under bridge lock */
+static int br_is_designated_for_some_port(const struct net_bridge *br)
+{
+	struct net_bridge_port *p;
+
+	list_for_each_entry(p, &br->port_list, list) {
+		if (p->state != BR_STATE_DISABLED &&
+		    !memcmp(&p->designated_bridge, &br->bridge_id, 8))
+			return 1;
+	}
+
+	return 0;
+}
+
+static void br_hello_timer_expired(unsigned long arg)
+{
+	struct net_bridge *br = (struct net_bridge *)arg;
+
+	pr_debug("%s: hello timer expired\n", br->dev->name);
+	spin_lock(&br->lock);
+	if (br->dev->flags & IFF_UP) {
+		br_config_bpdu_generation(br);
+
+		mod_timer(&br->hello_timer, jiffies + br->hello_time);
+	}
+	spin_unlock(&br->lock);
+}
+
+static void br_message_age_timer_expired(unsigned long arg)
+{
+	struct net_bridge_port *p = (struct net_bridge_port *) arg;
+	struct net_bridge *br = p->br;
+	const bridge_id *id = &p->designated_bridge;
+	int was_root;
+
+	if (p->state == BR_STATE_DISABLED)
+		return;
+
+
+	pr_info("%s: neighbor %.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x lost on port %d(%s)\n",
+		br->dev->name,
+		id->prio[0], id->prio[1],
+		id->addr[0], id->addr[1], id->addr[2],
+		id->addr[3], id->addr[4], id->addr[5],
+		p->port_no, p->dev->name);
+
+	/*
+	 * According to the spec, the message age timer cannot be
+	 * running when we are the root bridge. So..  this was_root
+	 * check is redundant. I'm leaving it in for now, though.
+	 */
+	spin_lock(&br->lock);
+	if (p->state == BR_STATE_DISABLED)
+		goto unlock;
+	was_root = br_is_root_bridge(br);
+
+	br_become_designated_port(p);
+	br_configuration_update(br);
+	br_port_state_selection(br);
+	if (br_is_root_bridge(br) && !was_root)
+		br_become_root_bridge(br);
+ unlock:
+	spin_unlock(&br->lock);
+}
+
+static void br_forward_delay_timer_expired(unsigned long arg)
+{
+	struct net_bridge_port *p = (struct net_bridge_port *) arg;
+	struct net_bridge *br = p->br;
+
+	pr_debug("%s: %d(%s) forward delay timer\n",
+		 br->dev->name, p->port_no, p->dev->name);
+	spin_lock(&br->lock);
+	if (p->state == BR_STATE_LISTENING) {
+		p->state = BR_STATE_LEARNING;
+		mod_timer(&p->forward_delay_timer,
+			  jiffies + br->forward_delay);
+	} else if (p->state == BR_STATE_LEARNING) {
+		p->state = BR_STATE_FORWARDING;
+		if (br_is_designated_for_some_port(br))
+			br_topology_change_detection(br);
+	}
+	br_log_state(p);
+	spin_unlock(&br->lock);
+}
+
+static void br_tcn_timer_expired(unsigned long arg)
+{
+	struct net_bridge *br = (struct net_bridge *) arg;
+
+	pr_debug("%s: tcn timer expired\n", br->dev->name);
+	spin_lock(&br->lock);
+	if (br->dev->flags & IFF_UP) {
+		br_transmit_tcn(br);
+
+		mod_timer(&br->tcn_timer,jiffies + br->bridge_hello_time);
+	}
+	spin_unlock(&br->lock);
+}
+
+static void br_topology_change_timer_expired(unsigned long arg)
+{
+	struct net_bridge *br = (struct net_bridge *) arg;
+
+	pr_debug("%s: topo change timer expired\n", br->dev->name);
+	spin_lock(&br->lock);
+	br->topology_change_detected = 0;
+	br->topology_change = 0;
+	spin_unlock(&br->lock);
+}
+
+static void br_hold_timer_expired(unsigned long arg)
+{
+	struct net_bridge_port *p = (struct net_bridge_port *) arg;
+
+	pr_debug("%s: %d(%s) hold timer expired\n",
+		 p->br->dev->name,  p->port_no, p->dev->name);
+
+	spin_lock(&p->br->lock);
+	if (p->config_pending)
+		br_transmit_config(p);
+	spin_unlock(&p->br->lock);
+}
+
+void br_stp_timer_init(struct net_bridge *br)
+{
+	setup_timer(&br->hello_timer, br_hello_timer_expired,
+		      (unsigned long) br);
+
+	setup_timer(&br->tcn_timer, br_tcn_timer_expired,
+		      (unsigned long) br);
+
+	setup_timer(&br->topology_change_timer,
+		      br_topology_change_timer_expired,
+		      (unsigned long) br);
+
+	setup_timer(&br->gc_timer, br_fdb_cleanup, (unsigned long) br);
+}
+
+void br_stp_port_timer_init(struct net_bridge_port *p)
+{
+	setup_timer(&p->message_age_timer, br_message_age_timer_expired,
+		      (unsigned long) p);
+
+	setup_timer(&p->forward_delay_timer, br_forward_delay_timer_expired,
+		      (unsigned long) p);
+
+	setup_timer(&p->hold_timer, br_hold_timer_expired,
+		      (unsigned long) p);
+}
+
+/* Report ticks left (in USER_HZ) used for API */
+unsigned long br_timer_value(const struct timer_list *timer)
+{
+	return timer_pending(timer)
+		? jiffies_to_clock_t(timer->expires - jiffies) : 0;
+}

net/bridge/br_sysfs_br.c

@@ -0,0 +1,434 @@
+/*
+ *	Sysfs attributes of bridge ports
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Stephen Hemminger		<shemminger@osdl.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.
+ */
+
+#include <linux/capability.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/if_bridge.h>
+#include <linux/rtnetlink.h>
+#include <linux/spinlock.h>
+#include <linux/times.h>
+
+#include "br_private.h"
+
+#define to_dev(obj)	container_of(obj, struct device, kobj)
+#define to_bridge(cd)	((struct net_bridge *)(to_net_dev(cd)->priv))
+
+/*
+ * Common code for storing bridge parameters.
+ */
+static ssize_t store_bridge_parm(struct device *d,
+				 const char *buf, size_t len,
+				 void (*set)(struct net_bridge *, unsigned long))
+{
+	struct net_bridge *br = to_bridge(d);
+	char *endp;
+	unsigned long val;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	val = simple_strtoul(buf, &endp, 0);
+	if (endp == buf)
+		return -EINVAL;
+
+	spin_lock_bh(&br->lock);
+	(*set)(br, val);
+	spin_unlock_bh(&br->lock);
+	return len;
+}
+
+
+static ssize_t show_forward_delay(struct device *d,
+				  struct device_attribute *attr, char *buf)
+{
+	struct net_bridge *br = to_bridge(d);
+	return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
+}
+
+static void set_forward_delay(struct net_bridge *br, unsigned long val)
+{
+	unsigned long delay = clock_t_to_jiffies(val);
+	br->forward_delay = delay;
+	if (br_is_root_bridge(br))
+		br->bridge_forward_delay = delay;
+}
+
+static ssize_t store_forward_delay(struct device *d,
+				   struct device_attribute *attr,
+				   const char *buf, size_t len)
+{
+	return store_bridge_parm(d, buf, len, set_forward_delay);
+}
+static DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR,
+		   show_forward_delay, store_forward_delay);
+
+static ssize_t show_hello_time(struct device *d, struct device_attribute *attr,
+			       char *buf)
+{
+	return sprintf(buf, "%lu\n",
+		       jiffies_to_clock_t(to_bridge(d)->hello_time));
+}
+
+static void set_hello_time(struct net_bridge *br, unsigned long val)
+{
+	unsigned long t = clock_t_to_jiffies(val);
+	br->hello_time = t;
+	if (br_is_root_bridge(br))
+		br->bridge_hello_time = t;
+}
+
+static ssize_t store_hello_time(struct device *d,
+				struct device_attribute *attr, const char *buf,
+				size_t len)
+{
+	return store_bridge_parm(d, buf, len, set_hello_time);
+}
+static DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time,
+		   store_hello_time);
+
+static ssize_t show_max_age(struct device *d, struct device_attribute *attr,
+			    char *buf)
+{
+	return sprintf(buf, "%lu\n",
+		       jiffies_to_clock_t(to_bridge(d)->max_age));
+}
+
+static void set_max_age(struct net_bridge *br, unsigned long val)
+{
+	unsigned long t = clock_t_to_jiffies(val);
+	br->max_age = t;
+	if (br_is_root_bridge(br))
+		br->bridge_max_age = t;
+}
+
+static ssize_t store_max_age(struct device *d, struct device_attribute *attr,
+			     const char *buf, size_t len)
+{
+	return store_bridge_parm(d, buf, len, set_max_age);
+}
+static DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age, store_max_age);
+
+static ssize_t show_ageing_time(struct device *d,
+				struct device_attribute *attr, char *buf)
+{
+	struct net_bridge *br = to_bridge(d);
+	return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
+}
+
+static void set_ageing_time(struct net_bridge *br, unsigned long val)
+{
+	br->ageing_time = clock_t_to_jiffies(val);
+}
+
+static ssize_t store_ageing_time(struct device *d,
+				 struct device_attribute *attr,
+				 const char *buf, size_t len)
+{
+	return store_bridge_parm(d, buf, len, set_ageing_time);
+}
+static DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time,
+		   store_ageing_time);
+
+static ssize_t show_stp_state(struct device *d,
+			      struct device_attribute *attr, char *buf)
+{
+	struct net_bridge *br = to_bridge(d);
+	return sprintf(buf, "%d\n", br->stp_enabled);
+}
+
+static void set_stp_state(struct net_bridge *br, unsigned long val)
+{
+	br->stp_enabled = val;
+}
+
+static ssize_t store_stp_state(struct device *d,
+			       struct device_attribute *attr, const char *buf,
+			       size_t len)
+{
+	return store_bridge_parm(d, buf, len, set_stp_state);
+}
+static DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
+		   store_stp_state);
+
+static ssize_t show_priority(struct device *d, struct device_attribute *attr,
+			     char *buf)
+{
+	struct net_bridge *br = to_bridge(d);
+	return sprintf(buf, "%d\n",
+		       (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
+}
+
+static void set_priority(struct net_bridge *br, unsigned long val)
+{
+	br_stp_set_bridge_priority(br, (u16) val);
+}
+
+static ssize_t store_priority(struct device *d, struct device_attribute *attr,
+			       const char *buf, size_t len)
+{
+	return store_bridge_parm(d, buf, len, set_priority);
+}
+static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority, store_priority);
+
+static ssize_t show_root_id(struct device *d, struct device_attribute *attr,
+			    char *buf)
+{
+	return br_show_bridge_id(buf, &to_bridge(d)->designated_root);
+}
+static DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL);
+
+static ssize_t show_bridge_id(struct device *d, struct device_attribute *attr,
+			      char *buf)
+{
+	return br_show_bridge_id(buf, &to_bridge(d)->bridge_id);
+}
+static DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL);
+
+static ssize_t show_root_port(struct device *d, struct device_attribute *attr,
+			      char *buf)
+{
+	return sprintf(buf, "%d\n", to_bridge(d)->root_port);
+}
+static DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL);
+
+static ssize_t show_root_path_cost(struct device *d,
+				   struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n", to_bridge(d)->root_path_cost);
+}
+static DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL);
+
+static ssize_t show_topology_change(struct device *d,
+				    struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n", to_bridge(d)->topology_change);
+}
+static DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL);
+
+static ssize_t show_topology_change_detected(struct device *d,
+					     struct device_attribute *attr,
+					     char *buf)
+{
+	struct net_bridge *br = to_bridge(d);
+	return sprintf(buf, "%d\n", br->topology_change_detected);
+}
+static DEVICE_ATTR(topology_change_detected, S_IRUGO,
+		   show_topology_change_detected, NULL);
+
+static ssize_t show_hello_timer(struct device *d,
+				struct device_attribute *attr, char *buf)
+{
+	struct net_bridge *br = to_bridge(d);
+	return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
+}
+static DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL);
+
+static ssize_t show_tcn_timer(struct device *d, struct device_attribute *attr,
+			      char *buf)
+{
+	struct net_bridge *br = to_bridge(d);
+	return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
+}
+static DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL);
+
+static ssize_t show_topology_change_timer(struct device *d,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct net_bridge *br = to_bridge(d);
+	return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
+}
+static DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer,
+		   NULL);
+
+static ssize_t show_gc_timer(struct device *d, struct device_attribute *attr,
+			     char *buf)
+{
+	struct net_bridge *br = to_bridge(d);
+	return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
+}
+static DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL);
+
+static ssize_t show_group_addr(struct device *d,
+			       struct device_attribute *attr, char *buf)
+{
+	struct net_bridge *br = to_bridge(d);
+	return sprintf(buf, "%x:%x:%x:%x:%x:%x\n",
+		       br->group_addr[0], br->group_addr[1],
+		       br->group_addr[2], br->group_addr[3],
+		       br->group_addr[4], br->group_addr[5]);
+}
+
+static ssize_t store_group_addr(struct device *d,
+				struct device_attribute *attr,
+				const char *buf, size_t len)
+{
+	struct net_bridge *br = to_bridge(d);
+	unsigned new_addr[6];
+	int i;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	if (sscanf(buf, "%x:%x:%x:%x:%x:%x",
+		   &new_addr[0], &new_addr[1], &new_addr[2],
+		   &new_addr[3], &new_addr[4], &new_addr[5]) != 6)
+		return -EINVAL;
+
+	/* Must be 01:80:c2:00:00:0X */
+	for (i = 0; i < 5; i++)
+		if (new_addr[i] != br_group_address[i])
+			return -EINVAL;
+
+	if (new_addr[5] & ~0xf)
+		return -EINVAL;
+
+	if (new_addr[5] == 1 	/* 802.3x Pause address */
+	    || new_addr[5] == 2 /* 802.3ad Slow protocols */
+	    || new_addr[5] == 3) /* 802.1X PAE address */
+		return -EINVAL;
+
+	spin_lock_bh(&br->lock);
+	for (i = 0; i < 6; i++)
+		br->group_addr[i] = new_addr[i];
+	spin_unlock_bh(&br->lock);
+	return len;
+}
+
+static DEVICE_ATTR(group_addr, S_IRUGO | S_IWUSR,
+		   show_group_addr, store_group_addr);
+
+
+static struct attribute *bridge_attrs[] = {
+	&dev_attr_forward_delay.attr,
+	&dev_attr_hello_time.attr,
+	&dev_attr_max_age.attr,
+	&dev_attr_ageing_time.attr,
+	&dev_attr_stp_state.attr,
+	&dev_attr_priority.attr,
+	&dev_attr_bridge_id.attr,
+	&dev_attr_root_id.attr,
+	&dev_attr_root_path_cost.attr,
+	&dev_attr_root_port.attr,
+	&dev_attr_topology_change.attr,
+	&dev_attr_topology_change_detected.attr,
+	&dev_attr_hello_timer.attr,
+	&dev_attr_tcn_timer.attr,
+	&dev_attr_topology_change_timer.attr,
+	&dev_attr_gc_timer.attr,
+	&dev_attr_group_addr.attr,
+	NULL
+};
+
+static struct attribute_group bridge_group = {
+	.name = SYSFS_BRIDGE_ATTR,
+	.attrs = bridge_attrs,
+};
+
+/*
+ * Export the forwarding information table as a binary file
+ * The records are struct __fdb_entry.
+ *
+ * Returns the number of bytes read.
+ */
+static ssize_t brforward_read(struct kobject *kobj, char *buf,
+			   loff_t off, size_t count)
+{
+	struct device *dev = to_dev(kobj);
+	struct net_bridge *br = to_bridge(dev);
+	int n;
+
+	/* must read whole records */
+	if (off % sizeof(struct __fdb_entry) != 0)
+		return -EINVAL;
+
+	n =  br_fdb_fillbuf(br, buf,
+			    count / sizeof(struct __fdb_entry),
+			    off / sizeof(struct __fdb_entry));
+
+	if (n > 0)
+		n *= sizeof(struct __fdb_entry);
+
+	return n;
+}
+
+static struct bin_attribute bridge_forward = {
+	.attr = { .name = SYSFS_BRIDGE_FDB,
+		  .mode = S_IRUGO,
+		  .owner = THIS_MODULE, },
+	.read = brforward_read,
+};
+
+/*
+ * Add entries in sysfs onto the existing network class device
+ * for the bridge.
+ *   Adds a attribute group "bridge" containing tuning parameters.
+ *   Binary attribute containing the forward table
+ *   Sub directory to hold links to interfaces.
+ *
+ * Note: the ifobj exists only to be a subdirectory
+ *   to hold links.  The ifobj exists in same data structure
+ *   as it's parent the bridge so reference counting works.
+ */
+int br_sysfs_addbr(struct net_device *dev)
+{
+	struct kobject *brobj = &dev->dev.kobj;
+	struct net_bridge *br = netdev_priv(dev);
+	int err;
+
+	err = sysfs_create_group(brobj, &bridge_group);
+	if (err) {
+		pr_info("%s: can't create group %s/%s\n",
+			__FUNCTION__, dev->name, bridge_group.name);
+		goto out1;
+	}
+
+	err = sysfs_create_bin_file(brobj, &bridge_forward);
+	if (err) {
+		pr_info("%s: can't create attribute file %s/%s\n",
+			__FUNCTION__, dev->name, bridge_forward.attr.name);
+		goto out2;
+	}
+
+
+	kobject_set_name(&br->ifobj, SYSFS_BRIDGE_PORT_SUBDIR);
+	br->ifobj.ktype = NULL;
+	br->ifobj.kset = NULL;
+	br->ifobj.parent = brobj;
+
+	err = kobject_register(&br->ifobj);
+	if (err) {
+		pr_info("%s: can't add kobject (directory) %s/%s\n",
+			__FUNCTION__, dev->name, br->ifobj.name);
+		goto out3;
+	}
+	return 0;
+ out3:
+	sysfs_remove_bin_file(&dev->dev.kobj, &bridge_forward);
+ out2:
+	sysfs_remove_group(&dev->dev.kobj, &bridge_group);
+ out1:
+	return err;
+
+}
+
+void br_sysfs_delbr(struct net_device *dev)
+{
+	struct kobject *kobj = &dev->dev.kobj;
+	struct net_bridge *br = netdev_priv(dev);
+
+	kobject_unregister(&br->ifobj);
+	sysfs_remove_bin_file(kobj, &bridge_forward);
+	sysfs_remove_group(kobj, &bridge_group);
+}

net/bridge/br_sysfs_if.c

@@ -0,0 +1,228 @@
+/*
+ *	Sysfs attributes of bridge ports
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Stephen Hemminger		<shemminger@osdl.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.
+ */
+
+#include <linux/capability.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/if_bridge.h>
+#include <linux/rtnetlink.h>
+#include <linux/spinlock.h>
+
+#include "br_private.h"
+
+struct brport_attribute {
+	struct attribute	attr;
+	ssize_t (*show)(struct net_bridge_port *, char *);
+	ssize_t (*store)(struct net_bridge_port *, unsigned long);
+};
+
+#define BRPORT_ATTR(_name,_mode,_show,_store)		        \
+struct brport_attribute brport_attr_##_name = { 	        \
+	.attr = {.name = __stringify(_name), 			\
+		 .mode = _mode, 				\
+		 .owner = THIS_MODULE, },			\
+	.show	= _show,					\
+	.store	= _store,					\
+};
+
+static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
+{
+	return sprintf(buf, "%d\n", p->path_cost);
+}
+static ssize_t store_path_cost(struct net_bridge_port *p, unsigned long v)
+{
+	br_stp_set_path_cost(p, v);
+	return 0;
+}
+static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
+		   show_path_cost, store_path_cost);
+
+static ssize_t show_priority(struct net_bridge_port *p, char *buf)
+{
+	return sprintf(buf, "%d\n", p->priority);
+}
+static ssize_t store_priority(struct net_bridge_port *p, unsigned long v)
+{
+	if (v >= (1<<(16-BR_PORT_BITS)))
+		return -ERANGE;
+	br_stp_set_port_priority(p, v);
+	return 0;
+}
+static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
+			 show_priority, store_priority);
+
+static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
+{
+	return br_show_bridge_id(buf, &p->designated_root);
+}
+static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
+
+static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
+{
+	return br_show_bridge_id(buf, &p->designated_bridge);
+}
+static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
+
+static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
+{
+	return sprintf(buf, "%d\n", p->designated_port);
+}
+static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
+
+static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
+{
+	return sprintf(buf, "%d\n", p->designated_cost);
+}
+static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
+
+static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
+{
+	return sprintf(buf, "0x%x\n", p->port_id);
+}
+static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
+
+static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
+{
+	return sprintf(buf, "0x%x\n", p->port_no);
+}
+
+static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
+
+static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
+{
+	return sprintf(buf, "%d\n", p->topology_change_ack);
+}
+static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
+
+static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
+{
+	return sprintf(buf, "%d\n", p->config_pending);
+}
+static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
+
+static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
+{
+	return sprintf(buf, "%d\n", p->state);
+}
+static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
+
+static ssize_t show_message_age_timer(struct net_bridge_port *p,
+					    char *buf)
+{
+	return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
+}
+static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
+
+static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
+					    char *buf)
+{
+	return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
+}
+static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
+
+static ssize_t show_hold_timer(struct net_bridge_port *p,
+					    char *buf)
+{
+	return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
+}
+static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
+
+static struct brport_attribute *brport_attrs[] = {
+	&brport_attr_path_cost,
+	&brport_attr_priority,
+	&brport_attr_port_id,
+	&brport_attr_port_no,
+	&brport_attr_designated_root,
+	&brport_attr_designated_bridge,
+	&brport_attr_designated_port,
+	&brport_attr_designated_cost,
+	&brport_attr_state,
+	&brport_attr_change_ack,
+	&brport_attr_config_pending,
+	&brport_attr_message_age_timer,
+	&brport_attr_forward_delay_timer,
+	&brport_attr_hold_timer,
+	NULL
+};
+
+#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
+#define to_brport(obj)	container_of(obj, struct net_bridge_port, kobj)
+
+static ssize_t brport_show(struct kobject * kobj,
+			   struct attribute * attr, char * buf)
+{
+	struct brport_attribute * brport_attr = to_brport_attr(attr);
+	struct net_bridge_port * p = to_brport(kobj);
+
+	return brport_attr->show(p, buf);
+}
+
+static ssize_t brport_store(struct kobject * kobj,
+			    struct attribute * attr,
+			    const char * buf, size_t count)
+{
+	struct brport_attribute * brport_attr = to_brport_attr(attr);
+	struct net_bridge_port * p = to_brport(kobj);
+	ssize_t ret = -EINVAL;
+	char *endp;
+	unsigned long val;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	val = simple_strtoul(buf, &endp, 0);
+	if (endp != buf) {
+		rtnl_lock();
+		if (p->dev && p->br && brport_attr->store) {
+			spin_lock_bh(&p->br->lock);
+			ret = brport_attr->store(p, val);
+			spin_unlock_bh(&p->br->lock);
+			if (ret == 0)
+				ret = count;
+		}
+		rtnl_unlock();
+	}
+	return ret;
+}
+
+struct sysfs_ops brport_sysfs_ops = {
+	.show = brport_show,
+	.store = brport_store,
+};
+
+/*
+ * Add sysfs entries to ethernet device added to a bridge.
+ * Creates a brport subdirectory with bridge attributes.
+ * Puts symlink in bridge's brport subdirectory
+ */
+int br_sysfs_addif(struct net_bridge_port *p)
+{
+	struct net_bridge *br = p->br;
+	struct brport_attribute **a;
+	int err;
+
+	err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
+				SYSFS_BRIDGE_PORT_LINK);
+	if (err)
+		goto out2;
+
+	for (a = brport_attrs; *a; ++a) {
+		err = sysfs_create_file(&p->kobj, &((*a)->attr));
+		if (err)
+			goto out2;
+	}
+
+	err= sysfs_create_link(&br->ifobj, &p->kobj, p->dev->name);
+out2:
+	return err;
+}

net/bridge/netfilter/Kconfig

@@ -0,0 +1,215 @@
+#
+# Bridge netfilter configuration
+#
+
+menu "Bridge: Netfilter Configuration"
+	depends on BRIDGE && NETFILTER
+
+config BRIDGE_NF_EBTABLES
+	tristate "Ethernet Bridge tables (ebtables) support"
+	help
+	  ebtables is a general, extensible frame/packet identification
+	  framework. Say 'Y' or 'M' here if you want to do Ethernet
+	  filtering/NAT/brouting on the Ethernet bridge.
+#
+# tables
+#
+config BRIDGE_EBT_BROUTE
+	tristate "ebt: broute table support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  The ebtables broute table is used to define rules that decide between
+	  bridging and routing frames, giving Linux the functionality of a
+	  brouter. See the man page for ebtables(8) and examples on the ebtables
+	  website.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config BRIDGE_EBT_T_FILTER
+	tristate "ebt: filter table support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  The ebtables filter table is used to define frame filtering rules at
+	  local input, forwarding and local output. See the man page for
+	  ebtables(8).
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config BRIDGE_EBT_T_NAT
+	tristate "ebt: nat table support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  The ebtables nat table is used to define rules that alter the MAC
+	  source address (MAC SNAT) or the MAC destination address (MAC DNAT).
+	  See the man page for ebtables(8).
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+#
+# matches
+#
+config BRIDGE_EBT_802_3
+	tristate "ebt: 802.3 filter support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option adds matching support for 802.3 Ethernet frames.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config BRIDGE_EBT_AMONG
+	tristate "ebt: among filter support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option adds the among match, which allows matching the MAC source
+	  and/or destination address on a list of addresses. Optionally,
+	  MAC/IP address pairs can be matched, f.e. for anti-spoofing rules.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config BRIDGE_EBT_ARP
+	tristate "ebt: ARP filter support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option adds the ARP match, which allows ARP and RARP header field
+	  filtering.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config BRIDGE_EBT_IP
+	tristate "ebt: IP filter support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option adds the IP match, which allows basic IP header field
+	  filtering.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config BRIDGE_EBT_LIMIT
+	tristate "ebt: limit match support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option adds the limit match, which allows you to control
+	  the rate at which a rule can be matched. This match is the
+	  equivalent of the iptables limit match.
+
+	  If you want to compile it as a module, say M here and read
+	  <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
+
+config BRIDGE_EBT_MARK
+	tristate "ebt: mark filter support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option adds the mark match, which allows matching frames based on
+	  the 'nfmark' value in the frame. This can be set by the mark target.
+	  This value is the same as the one used in the iptables mark match and
+	  target.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config BRIDGE_EBT_PKTTYPE
+	tristate "ebt: packet type filter support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option adds the packet type match, which allows matching on the
+	  type of packet based on its Ethernet "class" (as determined by
+	  the generic networking code): broadcast, multicast,
+	  for this host alone or for another host.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config BRIDGE_EBT_STP
+	tristate "ebt: STP filter support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option adds the Spanning Tree Protocol match, which
+	  allows STP header field filtering.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config BRIDGE_EBT_VLAN
+	tristate "ebt: 802.1Q VLAN filter support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option adds the 802.1Q vlan match, which allows the filtering of
+	  802.1Q vlan fields.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+#
+# targets
+#
+config BRIDGE_EBT_ARPREPLY
+	tristate "ebt: arp reply target support"
+	depends on BRIDGE_NF_EBTABLES && INET
+	help
+	  This option adds the arp reply target, which allows
+	  automatically sending arp replies to arp requests.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config BRIDGE_EBT_DNAT
+	tristate "ebt: dnat target support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option adds the MAC DNAT target, which allows altering the MAC
+	  destination address of frames.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config BRIDGE_EBT_MARK_T
+	tristate "ebt: mark target support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option adds the mark target, which allows marking frames by
+	  setting the 'nfmark' value in the frame.
+	  This value is the same as the one used in the iptables mark match and
+	  target.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config BRIDGE_EBT_REDIRECT
+	tristate "ebt: redirect target support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option adds the MAC redirect target, which allows altering the MAC
+	  destination address of a frame to that of the device it arrived on.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config BRIDGE_EBT_SNAT
+	tristate "ebt: snat target support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option adds the MAC SNAT target, which allows altering the MAC
+	  source address of frames.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+#
+# watchers
+#
+config BRIDGE_EBT_LOG
+	tristate "ebt: log support"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option adds the log watcher, that you can use in any rule
+	  in any ebtables table. It records info about the frame header
+	  to the syslog.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config BRIDGE_EBT_ULOG
+	tristate "ebt: ulog support (OBSOLETE)"
+	depends on BRIDGE_NF_EBTABLES
+	help
+	  This option enables the old bridge-specific "ebt_ulog" implementation
+	  which has been obsoleted by the new "nfnetlink_log" code (see
+	  CONFIG_NETFILTER_NETLINK_LOG).
+
+	  This option adds the ulog watcher, that you can use in any rule
+	  in any ebtables table. The packet is passed to a userspace
+	  logging daemon using netlink multicast sockets. This differs
+	  from the log watcher in the sense that the complete packet is
+	  sent to userspace instead of a descriptive text and that
+	  netlink multicast sockets are used instead of the syslog.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+endmenu

net/bridge/netfilter/Makefile

@@ -0,0 +1,32 @@
+#
+# Makefile for the netfilter modules for Link Layer filtering on a bridge.
+#
+
+obj-$(CONFIG_BRIDGE_NF_EBTABLES) += ebtables.o
+
+# tables
+obj-$(CONFIG_BRIDGE_EBT_BROUTE) += ebtable_broute.o
+obj-$(CONFIG_BRIDGE_EBT_T_FILTER) += ebtable_filter.o
+obj-$(CONFIG_BRIDGE_EBT_T_NAT) += ebtable_nat.o
+
+#matches
+obj-$(CONFIG_BRIDGE_EBT_802_3) += ebt_802_3.o
+obj-$(CONFIG_BRIDGE_EBT_AMONG) += ebt_among.o
+obj-$(CONFIG_BRIDGE_EBT_ARP) += ebt_arp.o
+obj-$(CONFIG_BRIDGE_EBT_IP) += ebt_ip.o
+obj-$(CONFIG_BRIDGE_EBT_LIMIT) += ebt_limit.o
+obj-$(CONFIG_BRIDGE_EBT_MARK) += ebt_mark_m.o
+obj-$(CONFIG_BRIDGE_EBT_PKTTYPE) += ebt_pkttype.o
+obj-$(CONFIG_BRIDGE_EBT_STP) += ebt_stp.o
+obj-$(CONFIG_BRIDGE_EBT_VLAN) += ebt_vlan.o
+
+# targets
+obj-$(CONFIG_BRIDGE_EBT_ARPREPLY) += ebt_arpreply.o
+obj-$(CONFIG_BRIDGE_EBT_MARK_T) += ebt_mark.o
+obj-$(CONFIG_BRIDGE_EBT_DNAT) += ebt_dnat.o
+obj-$(CONFIG_BRIDGE_EBT_REDIRECT) += ebt_redirect.o
+obj-$(CONFIG_BRIDGE_EBT_SNAT) += ebt_snat.o
+
+# watchers
+obj-$(CONFIG_BRIDGE_EBT_LOG) += ebt_log.o
+obj-$(CONFIG_BRIDGE_EBT_ULOG) += ebt_ulog.o

net/bridge/netfilter/ebt_802_3.c

@@ -0,0 +1,73 @@
+/*
+ * 802_3
+ *
+ * Author:
+ * Chris Vitale csv@bluetail.com
+ *
+ * May 2003
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_802_3.h>
+#include <linux/module.h>
+
+static int ebt_filter_802_3(const struct sk_buff *skb, const struct net_device *in,
+   const struct net_device *out, const void *data, unsigned int datalen)
+{
+	struct ebt_802_3_info *info = (struct ebt_802_3_info *)data;
+	struct ebt_802_3_hdr *hdr = ebt_802_3_hdr(skb);
+	__be16 type = hdr->llc.ui.ctrl & IS_UI ? hdr->llc.ui.type : hdr->llc.ni.type;
+
+	if (info->bitmask & EBT_802_3_SAP) {
+		if (FWINV(info->sap != hdr->llc.ui.ssap, EBT_802_3_SAP))
+				return EBT_NOMATCH;
+		if (FWINV(info->sap != hdr->llc.ui.dsap, EBT_802_3_SAP))
+				return EBT_NOMATCH;
+	}
+
+	if (info->bitmask & EBT_802_3_TYPE) {
+		if (!(hdr->llc.ui.dsap == CHECK_TYPE && hdr->llc.ui.ssap == CHECK_TYPE))
+			return EBT_NOMATCH;
+		if (FWINV(info->type != type, EBT_802_3_TYPE))
+			return EBT_NOMATCH;
+	}
+
+	return EBT_MATCH;
+}
+
+static struct ebt_match filter_802_3;
+static int ebt_802_3_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_802_3_info *info = (struct ebt_802_3_info *)data;
+
+	if (datalen < sizeof(struct ebt_802_3_info))
+		return -EINVAL;
+	if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK)
+		return -EINVAL;
+
+	return 0;
+}
+
+static struct ebt_match filter_802_3 =
+{
+	.name		= EBT_802_3_MATCH,
+	.match		= ebt_filter_802_3,
+	.check		= ebt_802_3_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_802_3_init(void)
+{
+	return ebt_register_match(&filter_802_3);
+}
+
+static void __exit ebt_802_3_fini(void)
+{
+	ebt_unregister_match(&filter_802_3);
+}
+
+module_init(ebt_802_3_init);
+module_exit(ebt_802_3_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebt_among.c

@@ -0,0 +1,228 @@
+/*
+ *  ebt_among
+ *
+ *	Authors:
+ *	Grzegorz Borowiak <grzes@gnu.univ.gda.pl>
+ *
+ *  August, 2003
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_among.h>
+#include <linux/ip.h>
+#include <linux/if_arp.h>
+#include <linux/module.h>
+
+static int ebt_mac_wormhash_contains(const struct ebt_mac_wormhash *wh,
+				     const char *mac, __be32 ip)
+{
+	/* You may be puzzled as to how this code works.
+	 * Some tricks were used, refer to
+	 * 	include/linux/netfilter_bridge/ebt_among.h
+	 * as there you can find a solution of this mystery.
+	 */
+	const struct ebt_mac_wormhash_tuple *p;
+	int start, limit, i;
+	uint32_t cmp[2] = { 0, 0 };
+	int key = (const unsigned char) mac[5];
+
+	memcpy(((char *) cmp) + 2, mac, 6);
+	start = wh->table[key];
+	limit = wh->table[key + 1];
+	if (ip) {
+		for (i = start; i < limit; i++) {
+			p = &wh->pool[i];
+			if (cmp[1] == p->cmp[1] && cmp[0] == p->cmp[0]) {
+				if (p->ip == 0 || p->ip == ip) {
+					return 1;
+				}
+			}
+		}
+	} else {
+		for (i = start; i < limit; i++) {
+			p = &wh->pool[i];
+			if (cmp[1] == p->cmp[1] && cmp[0] == p->cmp[0]) {
+				if (p->ip == 0) {
+					return 1;
+				}
+			}
+		}
+	}
+	return 0;
+}
+
+static int ebt_mac_wormhash_check_integrity(const struct ebt_mac_wormhash
+					    *wh)
+{
+	int i;
+
+	for (i = 0; i < 256; i++) {
+		if (wh->table[i] > wh->table[i + 1])
+			return -0x100 - i;
+		if (wh->table[i] < 0)
+			return -0x200 - i;
+		if (wh->table[i] > wh->poolsize)
+			return -0x300 - i;
+	}
+	if (wh->table[256] > wh->poolsize)
+		return -0xc00;
+	return 0;
+}
+
+static int get_ip_dst(const struct sk_buff *skb, __be32 *addr)
+{
+	if (eth_hdr(skb)->h_proto == htons(ETH_P_IP)) {
+		struct iphdr _iph, *ih;
+
+		ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
+		if (ih == NULL)
+			return -1;
+		*addr = ih->daddr;
+	} else if (eth_hdr(skb)->h_proto == htons(ETH_P_ARP)) {
+		struct arphdr _arph, *ah;
+		__be32 buf, *bp;
+
+		ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
+		if (ah == NULL ||
+		    ah->ar_pln != sizeof(__be32) ||
+		    ah->ar_hln != ETH_ALEN)
+			return -1;
+		bp = skb_header_pointer(skb, sizeof(struct arphdr) +
+					2 * ETH_ALEN + sizeof(__be32),
+					sizeof(__be32), &buf);
+		if (bp == NULL)
+			return -1;
+		*addr = *bp;
+	}
+	return 0;
+}
+
+static int get_ip_src(const struct sk_buff *skb, __be32 *addr)
+{
+	if (eth_hdr(skb)->h_proto == htons(ETH_P_IP)) {
+		struct iphdr _iph, *ih;
+
+		ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
+		if (ih == NULL)
+			return -1;
+		*addr = ih->saddr;
+	} else if (eth_hdr(skb)->h_proto == htons(ETH_P_ARP)) {
+		struct arphdr _arph, *ah;
+		__be32 buf, *bp;
+
+		ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
+		if (ah == NULL ||
+		    ah->ar_pln != sizeof(__be32) ||
+		    ah->ar_hln != ETH_ALEN)
+			return -1;
+		bp = skb_header_pointer(skb, sizeof(struct arphdr) +
+					ETH_ALEN, sizeof(__be32), &buf);
+		if (bp == NULL)
+			return -1;
+		*addr = *bp;
+	}
+	return 0;
+}
+
+static int ebt_filter_among(const struct sk_buff *skb,
+			    const struct net_device *in,
+			    const struct net_device *out, const void *data,
+			    unsigned int datalen)
+{
+	struct ebt_among_info *info = (struct ebt_among_info *) data;
+	const char *dmac, *smac;
+	const struct ebt_mac_wormhash *wh_dst, *wh_src;
+	__be32 dip = 0, sip = 0;
+
+	wh_dst = ebt_among_wh_dst(info);
+	wh_src = ebt_among_wh_src(info);
+
+	if (wh_src) {
+		smac = eth_hdr(skb)->h_source;
+		if (get_ip_src(skb, &sip))
+			return EBT_NOMATCH;
+		if (!(info->bitmask & EBT_AMONG_SRC_NEG)) {
+			/* we match only if it contains */
+			if (!ebt_mac_wormhash_contains(wh_src, smac, sip))
+				return EBT_NOMATCH;
+		} else {
+			/* we match only if it DOES NOT contain */
+			if (ebt_mac_wormhash_contains(wh_src, smac, sip))
+				return EBT_NOMATCH;
+		}
+	}
+
+	if (wh_dst) {
+		dmac = eth_hdr(skb)->h_dest;
+		if (get_ip_dst(skb, &dip))
+			return EBT_NOMATCH;
+		if (!(info->bitmask & EBT_AMONG_DST_NEG)) {
+			/* we match only if it contains */
+			if (!ebt_mac_wormhash_contains(wh_dst, dmac, dip))
+				return EBT_NOMATCH;
+		} else {
+			/* we match only if it DOES NOT contain */
+			if (ebt_mac_wormhash_contains(wh_dst, dmac, dip))
+				return EBT_NOMATCH;
+		}
+	}
+
+	return EBT_MATCH;
+}
+
+static int ebt_among_check(const char *tablename, unsigned int hookmask,
+			   const struct ebt_entry *e, void *data,
+			   unsigned int datalen)
+{
+	struct ebt_among_info *info = (struct ebt_among_info *) data;
+	int expected_length = sizeof(struct ebt_among_info);
+	const struct ebt_mac_wormhash *wh_dst, *wh_src;
+	int err;
+
+	wh_dst = ebt_among_wh_dst(info);
+	wh_src = ebt_among_wh_src(info);
+	expected_length += ebt_mac_wormhash_size(wh_dst);
+	expected_length += ebt_mac_wormhash_size(wh_src);
+
+	if (datalen != EBT_ALIGN(expected_length)) {
+		printk(KERN_WARNING
+		       "ebtables: among: wrong size: %d"
+		       "against expected %d, rounded to %Zd\n",
+		       datalen, expected_length,
+		       EBT_ALIGN(expected_length));
+		return -EINVAL;
+	}
+	if (wh_dst && (err = ebt_mac_wormhash_check_integrity(wh_dst))) {
+		printk(KERN_WARNING
+		       "ebtables: among: dst integrity fail: %x\n", -err);
+		return -EINVAL;
+	}
+	if (wh_src && (err = ebt_mac_wormhash_check_integrity(wh_src))) {
+		printk(KERN_WARNING
+		       "ebtables: among: src integrity fail: %x\n", -err);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static struct ebt_match filter_among = {
+	.name		= EBT_AMONG_MATCH,
+	.match		= ebt_filter_among,
+	.check		= ebt_among_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_among_init(void)
+{
+	return ebt_register_match(&filter_among);
+}
+
+static void __exit ebt_among_fini(void)
+{
+	ebt_unregister_match(&filter_among);
+}
+
+module_init(ebt_among_init);
+module_exit(ebt_among_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebt_arp.c

@@ -0,0 +1,140 @@
+/*
+ *  ebt_arp
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *	Tim Gardner <timg@tpi.com>
+ *
+ *  April, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_arp.h>
+#include <linux/if_arp.h>
+#include <linux/if_ether.h>
+#include <linux/module.h>
+
+static int ebt_filter_arp(const struct sk_buff *skb, const struct net_device *in,
+   const struct net_device *out, const void *data, unsigned int datalen)
+{
+	struct ebt_arp_info *info = (struct ebt_arp_info *)data;
+	struct arphdr _arph, *ah;
+
+	ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
+	if (ah == NULL)
+		return EBT_NOMATCH;
+	if (info->bitmask & EBT_ARP_OPCODE && FWINV(info->opcode !=
+	   ah->ar_op, EBT_ARP_OPCODE))
+		return EBT_NOMATCH;
+	if (info->bitmask & EBT_ARP_HTYPE && FWINV(info->htype !=
+	   ah->ar_hrd, EBT_ARP_HTYPE))
+		return EBT_NOMATCH;
+	if (info->bitmask & EBT_ARP_PTYPE && FWINV(info->ptype !=
+	   ah->ar_pro, EBT_ARP_PTYPE))
+		return EBT_NOMATCH;
+
+	if (info->bitmask & (EBT_ARP_SRC_IP | EBT_ARP_DST_IP)) {
+		__be32 _addr, *ap;
+
+		/* IPv4 addresses are always 4 bytes */
+		if (ah->ar_pln != sizeof(__be32))
+			return EBT_NOMATCH;
+		if (info->bitmask & EBT_ARP_SRC_IP) {
+			ap = skb_header_pointer(skb, sizeof(struct arphdr) +
+						ah->ar_hln, sizeof(_addr),
+						&_addr);
+			if (ap == NULL)
+				return EBT_NOMATCH;
+			if (FWINV(info->saddr != (*ap & info->smsk),
+			   EBT_ARP_SRC_IP))
+				return EBT_NOMATCH;
+		}
+
+		if (info->bitmask & EBT_ARP_DST_IP) {
+			ap = skb_header_pointer(skb, sizeof(struct arphdr) +
+						2*ah->ar_hln+sizeof(__be32),
+						sizeof(_addr), &_addr);
+			if (ap == NULL)
+				return EBT_NOMATCH;
+			if (FWINV(info->daddr != (*ap & info->dmsk),
+			   EBT_ARP_DST_IP))
+				return EBT_NOMATCH;
+		}
+	}
+
+	if (info->bitmask & (EBT_ARP_SRC_MAC | EBT_ARP_DST_MAC)) {
+		unsigned char _mac[ETH_ALEN], *mp;
+		uint8_t verdict, i;
+
+		/* MAC addresses are 6 bytes */
+		if (ah->ar_hln != ETH_ALEN)
+			return EBT_NOMATCH;
+		if (info->bitmask & EBT_ARP_SRC_MAC) {
+			mp = skb_header_pointer(skb, sizeof(struct arphdr),
+						sizeof(_mac), &_mac);
+			if (mp == NULL)
+				return EBT_NOMATCH;
+			verdict = 0;
+			for (i = 0; i < 6; i++)
+				verdict |= (mp[i] ^ info->smaddr[i]) &
+				       info->smmsk[i];
+			if (FWINV(verdict != 0, EBT_ARP_SRC_MAC))
+				return EBT_NOMATCH;
+		}
+
+		if (info->bitmask & EBT_ARP_DST_MAC) {
+			mp = skb_header_pointer(skb, sizeof(struct arphdr) +
+						ah->ar_hln + ah->ar_pln,
+						sizeof(_mac), &_mac);
+			if (mp == NULL)
+				return EBT_NOMATCH;
+			verdict = 0;
+			for (i = 0; i < 6; i++)
+				verdict |= (mp[i] ^ info->dmaddr[i]) &
+					info->dmmsk[i];
+			if (FWINV(verdict != 0, EBT_ARP_DST_MAC))
+				return EBT_NOMATCH;
+		}
+	}
+
+	return EBT_MATCH;
+}
+
+static int ebt_arp_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_arp_info *info = (struct ebt_arp_info *)data;
+
+	if (datalen != EBT_ALIGN(sizeof(struct ebt_arp_info)))
+		return -EINVAL;
+	if ((e->ethproto != htons(ETH_P_ARP) &&
+	   e->ethproto != htons(ETH_P_RARP)) ||
+	   e->invflags & EBT_IPROTO)
+		return -EINVAL;
+	if (info->bitmask & ~EBT_ARP_MASK || info->invflags & ~EBT_ARP_MASK)
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_match filter_arp =
+{
+	.name		= EBT_ARP_MATCH,
+	.match		= ebt_filter_arp,
+	.check		= ebt_arp_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_arp_init(void)
+{
+	return ebt_register_match(&filter_arp);
+}
+
+static void __exit ebt_arp_fini(void)
+{
+	ebt_unregister_match(&filter_arp);
+}
+
+module_init(ebt_arp_init);
+module_exit(ebt_arp_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebt_arpreply.c

@@ -0,0 +1,97 @@
+/*
+ *  ebt_arpreply
+ *
+ *	Authors:
+ *	Grzegorz Borowiak <grzes@gnu.univ.gda.pl>
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  August, 2003
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_arpreply.h>
+#include <linux/if_arp.h>
+#include <net/arp.h>
+#include <linux/module.h>
+
+static int ebt_target_reply(struct sk_buff **pskb, unsigned int hooknr,
+   const struct net_device *in, const struct net_device *out,
+   const void *data, unsigned int datalen)
+{
+	struct ebt_arpreply_info *info = (struct ebt_arpreply_info *)data;
+	__be32 _sip, *siptr, _dip, *diptr;
+	struct arphdr _ah, *ap;
+	unsigned char _sha[ETH_ALEN], *shp;
+	struct sk_buff *skb = *pskb;
+
+	ap = skb_header_pointer(skb, 0, sizeof(_ah), &_ah);
+	if (ap == NULL)
+		return EBT_DROP;
+
+	if (ap->ar_op != htons(ARPOP_REQUEST) ||
+	    ap->ar_hln != ETH_ALEN ||
+	    ap->ar_pro != htons(ETH_P_IP) ||
+	    ap->ar_pln != 4)
+		return EBT_CONTINUE;
+
+	shp = skb_header_pointer(skb, sizeof(_ah), ETH_ALEN, &_sha);
+	if (shp == NULL)
+		return EBT_DROP;
+
+	siptr = skb_header_pointer(skb, sizeof(_ah) + ETH_ALEN,
+				   sizeof(_sip), &_sip);
+	if (siptr == NULL)
+		return EBT_DROP;
+
+	diptr = skb_header_pointer(skb,
+				   sizeof(_ah) + 2 * ETH_ALEN + sizeof(_sip),
+				   sizeof(_dip), &_dip);
+	if (diptr == NULL)
+		return EBT_DROP;
+
+	arp_send(ARPOP_REPLY, ETH_P_ARP, *siptr, (struct net_device *)in,
+		 *diptr, shp, info->mac, shp);
+
+	return info->target;
+}
+
+static int ebt_target_reply_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_arpreply_info *info = (struct ebt_arpreply_info *)data;
+
+	if (datalen != EBT_ALIGN(sizeof(struct ebt_arpreply_info)))
+		return -EINVAL;
+	if (BASE_CHAIN && info->target == EBT_RETURN)
+		return -EINVAL;
+	if (e->ethproto != htons(ETH_P_ARP) ||
+	    e->invflags & EBT_IPROTO)
+		return -EINVAL;
+	CLEAR_BASE_CHAIN_BIT;
+	if (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING))
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_target reply_target =
+{
+	.name		= EBT_ARPREPLY_TARGET,
+	.target		= ebt_target_reply,
+	.check		= ebt_target_reply_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_arpreply_init(void)
+{
+	return ebt_register_target(&reply_target);
+}
+
+static void __exit ebt_arpreply_fini(void)
+{
+	ebt_unregister_target(&reply_target);
+}
+
+module_init(ebt_arpreply_init);
+module_exit(ebt_arpreply_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebt_dnat.c

@@ -0,0 +1,76 @@
+/*
+ *  ebt_dnat
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  June, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_nat.h>
+#include <linux/module.h>
+#include <net/sock.h>
+
+static int ebt_target_dnat(struct sk_buff **pskb, unsigned int hooknr,
+   const struct net_device *in, const struct net_device *out,
+   const void *data, unsigned int datalen)
+{
+	struct ebt_nat_info *info = (struct ebt_nat_info *)data;
+
+	if (skb_shared(*pskb) || skb_cloned(*pskb)) {
+		struct sk_buff *nskb;
+
+		nskb = skb_copy(*pskb, GFP_ATOMIC);
+		if (!nskb)
+			return NF_DROP;
+		if ((*pskb)->sk)
+			skb_set_owner_w(nskb, (*pskb)->sk);
+		kfree_skb(*pskb);
+		*pskb = nskb;
+	}
+	memcpy(eth_hdr(*pskb)->h_dest, info->mac, ETH_ALEN);
+	return info->target;
+}
+
+static int ebt_target_dnat_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_nat_info *info = (struct ebt_nat_info *)data;
+
+	if (BASE_CHAIN && info->target == EBT_RETURN)
+		return -EINVAL;
+	CLEAR_BASE_CHAIN_BIT;
+	if ( (strcmp(tablename, "nat") ||
+	   (hookmask & ~((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT)))) &&
+	   (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) )
+		return -EINVAL;
+	if (datalen != EBT_ALIGN(sizeof(struct ebt_nat_info)))
+		return -EINVAL;
+	if (INVALID_TARGET)
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_target dnat =
+{
+	.name		= EBT_DNAT_TARGET,
+	.target		= ebt_target_dnat,
+	.check		= ebt_target_dnat_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_dnat_init(void)
+{
+	return ebt_register_target(&dnat);
+}
+
+static void __exit ebt_dnat_fini(void)
+{
+	ebt_unregister_target(&dnat);
+}
+
+module_init(ebt_dnat_init);
+module_exit(ebt_dnat_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebt_ip.c

@@ -0,0 +1,128 @@
+/*
+ *  ebt_ip
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  April, 2002
+ *
+ *  Changes:
+ *    added ip-sport and ip-dport
+ *    Innominate Security Technologies AG <mhopf@innominate.com>
+ *    September, 2002
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_ip.h>
+#include <linux/ip.h>
+#include <net/ip.h>
+#include <linux/in.h>
+#include <linux/module.h>
+
+struct tcpudphdr {
+	__be16 src;
+	__be16 dst;
+};
+
+static int ebt_filter_ip(const struct sk_buff *skb, const struct net_device *in,
+   const struct net_device *out, const void *data,
+   unsigned int datalen)
+{
+	struct ebt_ip_info *info = (struct ebt_ip_info *)data;
+	struct iphdr _iph, *ih;
+	struct tcpudphdr _ports, *pptr;
+
+	ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
+	if (ih == NULL)
+		return EBT_NOMATCH;
+	if (info->bitmask & EBT_IP_TOS &&
+	   FWINV(info->tos != ih->tos, EBT_IP_TOS))
+		return EBT_NOMATCH;
+	if (info->bitmask & EBT_IP_SOURCE &&
+	   FWINV((ih->saddr & info->smsk) !=
+	   info->saddr, EBT_IP_SOURCE))
+		return EBT_NOMATCH;
+	if ((info->bitmask & EBT_IP_DEST) &&
+	   FWINV((ih->daddr & info->dmsk) !=
+	   info->daddr, EBT_IP_DEST))
+		return EBT_NOMATCH;
+	if (info->bitmask & EBT_IP_PROTO) {
+		if (FWINV(info->protocol != ih->protocol, EBT_IP_PROTO))
+			return EBT_NOMATCH;
+		if (!(info->bitmask & EBT_IP_DPORT) &&
+		    !(info->bitmask & EBT_IP_SPORT))
+			return EBT_MATCH;
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			return EBT_NOMATCH;
+		pptr = skb_header_pointer(skb, ih->ihl*4,
+					  sizeof(_ports), &_ports);
+		if (pptr == NULL)
+			return EBT_NOMATCH;
+		if (info->bitmask & EBT_IP_DPORT) {
+			u32 dst = ntohs(pptr->dst);
+			if (FWINV(dst < info->dport[0] ||
+				  dst > info->dport[1],
+				  EBT_IP_DPORT))
+			return EBT_NOMATCH;
+		}
+		if (info->bitmask & EBT_IP_SPORT) {
+			u32 src = ntohs(pptr->src);
+			if (FWINV(src < info->sport[0] ||
+				  src > info->sport[1],
+				  EBT_IP_SPORT))
+			return EBT_NOMATCH;
+		}
+	}
+	return EBT_MATCH;
+}
+
+static int ebt_ip_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_ip_info *info = (struct ebt_ip_info *)data;
+
+	if (datalen != EBT_ALIGN(sizeof(struct ebt_ip_info)))
+		return -EINVAL;
+	if (e->ethproto != htons(ETH_P_IP) ||
+	   e->invflags & EBT_IPROTO)
+		return -EINVAL;
+	if (info->bitmask & ~EBT_IP_MASK || info->invflags & ~EBT_IP_MASK)
+		return -EINVAL;
+	if (info->bitmask & (EBT_IP_DPORT | EBT_IP_SPORT)) {
+		if (info->invflags & EBT_IP_PROTO)
+			return -EINVAL;
+		if (info->protocol != IPPROTO_TCP &&
+		    info->protocol != IPPROTO_UDP &&
+		    info->protocol != IPPROTO_UDPLITE &&
+		    info->protocol != IPPROTO_SCTP &&
+		    info->protocol != IPPROTO_DCCP)
+			 return -EINVAL;
+	}
+	if (info->bitmask & EBT_IP_DPORT && info->dport[0] > info->dport[1])
+		return -EINVAL;
+	if (info->bitmask & EBT_IP_SPORT && info->sport[0] > info->sport[1])
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_match filter_ip =
+{
+	.name		= EBT_IP_MATCH,
+	.match		= ebt_filter_ip,
+	.check		= ebt_ip_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_ip_init(void)
+{
+	return ebt_register_match(&filter_ip);
+}
+
+static void __exit ebt_ip_fini(void)
+{
+	ebt_unregister_match(&filter_ip);
+}
+
+module_init(ebt_ip_init);
+module_exit(ebt_ip_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebt_limit.c

@@ -0,0 +1,113 @@
+/*
+ *  ebt_limit
+ *
+ *	Authors:
+ *	Tom Marshall <tommy@home.tig-grr.com>
+ *
+ *	Mostly copied from netfilter's ipt_limit.c, see that file for
+ *	more explanation
+ *
+ *  September, 2003
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_limit.h>
+#include <linux/module.h>
+
+#include <linux/netdevice.h>
+#include <linux/spinlock.h>
+
+static DEFINE_SPINLOCK(limit_lock);
+
+#define MAX_CPJ (0xFFFFFFFF / (HZ*60*60*24))
+
+#define _POW2_BELOW2(x) ((x)|((x)>>1))
+#define _POW2_BELOW4(x) (_POW2_BELOW2(x)|_POW2_BELOW2((x)>>2))
+#define _POW2_BELOW8(x) (_POW2_BELOW4(x)|_POW2_BELOW4((x)>>4))
+#define _POW2_BELOW16(x) (_POW2_BELOW8(x)|_POW2_BELOW8((x)>>8))
+#define _POW2_BELOW32(x) (_POW2_BELOW16(x)|_POW2_BELOW16((x)>>16))
+#define POW2_BELOW32(x) ((_POW2_BELOW32(x)>>1) + 1)
+
+#define CREDITS_PER_JIFFY POW2_BELOW32(MAX_CPJ)
+
+static int ebt_limit_match(const struct sk_buff *skb,
+   const struct net_device *in, const struct net_device *out,
+   const void *data, unsigned int datalen)
+{
+	struct ebt_limit_info *info = (struct ebt_limit_info *)data;
+	unsigned long now = jiffies;
+
+	spin_lock_bh(&limit_lock);
+	info->credit += (now - xchg(&info->prev, now)) * CREDITS_PER_JIFFY;
+	if (info->credit > info->credit_cap)
+		info->credit = info->credit_cap;
+
+	if (info->credit >= info->cost) {
+		/* We're not limited. */
+		info->credit -= info->cost;
+		spin_unlock_bh(&limit_lock);
+		return EBT_MATCH;
+	}
+
+	spin_unlock_bh(&limit_lock);
+	return EBT_NOMATCH;
+}
+
+/* Precision saver. */
+static u_int32_t
+user2credits(u_int32_t user)
+{
+	/* If multiplying would overflow... */
+	if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY))
+		/* Divide first. */
+		return (user / EBT_LIMIT_SCALE) * HZ * CREDITS_PER_JIFFY;
+
+	return (user * HZ * CREDITS_PER_JIFFY) / EBT_LIMIT_SCALE;
+}
+
+static int ebt_limit_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_limit_info *info = (struct ebt_limit_info *)data;
+
+	if (datalen != EBT_ALIGN(sizeof(struct ebt_limit_info)))
+		return -EINVAL;
+
+	/* Check for overflow. */
+	if (info->burst == 0 ||
+	    user2credits(info->avg * info->burst) < user2credits(info->avg)) {
+		printk("Overflow in ebt_limit, try lower: %u/%u\n",
+			info->avg, info->burst);
+		return -EINVAL;
+	}
+
+	/* User avg in seconds * EBT_LIMIT_SCALE: convert to jiffies * 128. */
+	info->prev = jiffies;
+	info->credit = user2credits(info->avg * info->burst);
+	info->credit_cap = user2credits(info->avg * info->burst);
+	info->cost = user2credits(info->avg);
+	return 0;
+}
+
+static struct ebt_match ebt_limit_reg =
+{
+	.name		= EBT_LIMIT_MATCH,
+	.match		= ebt_limit_match,
+	.check		= ebt_limit_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_limit_init(void)
+{
+	return ebt_register_match(&ebt_limit_reg);
+}
+
+static void __exit ebt_limit_fini(void)
+{
+	ebt_unregister_match(&ebt_limit_reg);
+}
+
+module_init(ebt_limit_init);
+module_exit(ebt_limit_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebt_log.c

@@ -0,0 +1,217 @@
+/*
+ *  ebt_log
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *	Harald Welte <laforge@netfilter.org>
+ *
+ *  April, 2002
+ *
+ */
+
+#include <linux/in.h>
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_log.h>
+#include <linux/netfilter.h>
+#include <linux/module.h>
+#include <linux/ip.h>
+#include <linux/in.h>
+#include <linux/if_arp.h>
+#include <linux/spinlock.h>
+
+static DEFINE_SPINLOCK(ebt_log_lock);
+
+static int ebt_log_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_log_info *info = (struct ebt_log_info *)data;
+
+	if (datalen != EBT_ALIGN(sizeof(struct ebt_log_info)))
+		return -EINVAL;
+	if (info->bitmask & ~EBT_LOG_MASK)
+		return -EINVAL;
+	if (info->loglevel >= 8)
+		return -EINVAL;
+	info->prefix[EBT_LOG_PREFIX_SIZE - 1] = '\0';
+	return 0;
+}
+
+struct tcpudphdr
+{
+	__be16 src;
+	__be16 dst;
+};
+
+struct arppayload
+{
+	unsigned char mac_src[ETH_ALEN];
+	unsigned char ip_src[4];
+	unsigned char mac_dst[ETH_ALEN];
+	unsigned char ip_dst[4];
+};
+
+static void print_MAC(unsigned char *p)
+{
+	int i;
+
+	for (i = 0; i < ETH_ALEN; i++, p++)
+		printk("%02x%c", *p, i == ETH_ALEN - 1 ? ' ':':');
+}
+
+#define myNIPQUAD(a) a[0], a[1], a[2], a[3]
+static void
+ebt_log_packet(unsigned int pf, unsigned int hooknum,
+   const struct sk_buff *skb, const struct net_device *in,
+   const struct net_device *out, const struct nf_loginfo *loginfo,
+   const char *prefix)
+{
+	unsigned int bitmask;
+
+	spin_lock_bh(&ebt_log_lock);
+	printk("<%c>%s IN=%s OUT=%s MAC source = ", '0' + loginfo->u.log.level,
+	       prefix, in ? in->name : "", out ? out->name : "");
+
+	print_MAC(eth_hdr(skb)->h_source);
+	printk("MAC dest = ");
+	print_MAC(eth_hdr(skb)->h_dest);
+
+	printk("proto = 0x%04x", ntohs(eth_hdr(skb)->h_proto));
+
+	if (loginfo->type == NF_LOG_TYPE_LOG)
+		bitmask = loginfo->u.log.logflags;
+	else
+		bitmask = NF_LOG_MASK;
+
+	if ((bitmask & EBT_LOG_IP) && eth_hdr(skb)->h_proto ==
+	   htons(ETH_P_IP)){
+		struct iphdr _iph, *ih;
+
+		ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
+		if (ih == NULL) {
+			printk(" INCOMPLETE IP header");
+			goto out;
+		}
+		printk(" IP SRC=%u.%u.%u.%u IP DST=%u.%u.%u.%u, IP "
+		       "tos=0x%02X, IP proto=%d", NIPQUAD(ih->saddr),
+		       NIPQUAD(ih->daddr), ih->tos, ih->protocol);
+		if (ih->protocol == IPPROTO_TCP ||
+		    ih->protocol == IPPROTO_UDP ||
+		    ih->protocol == IPPROTO_UDPLITE ||
+		    ih->protocol == IPPROTO_SCTP ||
+		    ih->protocol == IPPROTO_DCCP) {
+			struct tcpudphdr _ports, *pptr;
+
+			pptr = skb_header_pointer(skb, ih->ihl*4,
+						  sizeof(_ports), &_ports);
+			if (pptr == NULL) {
+				printk(" INCOMPLETE TCP/UDP header");
+				goto out;
+			}
+			printk(" SPT=%u DPT=%u", ntohs(pptr->src),
+			   ntohs(pptr->dst));
+		}
+		goto out;
+	}
+
+	if ((bitmask & EBT_LOG_ARP) &&
+	    ((eth_hdr(skb)->h_proto == htons(ETH_P_ARP)) ||
+	     (eth_hdr(skb)->h_proto == htons(ETH_P_RARP)))) {
+		struct arphdr _arph, *ah;
+
+		ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
+		if (ah == NULL) {
+			printk(" INCOMPLETE ARP header");
+			goto out;
+		}
+		printk(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d",
+		       ntohs(ah->ar_hrd), ntohs(ah->ar_pro),
+		       ntohs(ah->ar_op));
+
+		/* If it's for Ethernet and the lengths are OK,
+		 * then log the ARP payload */
+		if (ah->ar_hrd == htons(1) &&
+		    ah->ar_hln == ETH_ALEN &&
+		    ah->ar_pln == sizeof(__be32)) {
+			struct arppayload _arpp, *ap;
+
+			ap = skb_header_pointer(skb, sizeof(_arph),
+						sizeof(_arpp), &_arpp);
+			if (ap == NULL) {
+				printk(" INCOMPLETE ARP payload");
+				goto out;
+			}
+			printk(" ARP MAC SRC=");
+			print_MAC(ap->mac_src);
+			printk(" ARP IP SRC=%u.%u.%u.%u",
+			       myNIPQUAD(ap->ip_src));
+			printk(" ARP MAC DST=");
+			print_MAC(ap->mac_dst);
+			printk(" ARP IP DST=%u.%u.%u.%u",
+			       myNIPQUAD(ap->ip_dst));
+		}
+	}
+out:
+	printk("\n");
+	spin_unlock_bh(&ebt_log_lock);
+
+}
+
+static void ebt_log(const struct sk_buff *skb, unsigned int hooknr,
+   const struct net_device *in, const struct net_device *out,
+   const void *data, unsigned int datalen)
+{
+	struct ebt_log_info *info = (struct ebt_log_info *)data;
+	struct nf_loginfo li;
+
+	li.type = NF_LOG_TYPE_LOG;
+	li.u.log.level = info->loglevel;
+	li.u.log.logflags = info->bitmask;
+
+	if (info->bitmask & EBT_LOG_NFLOG)
+		nf_log_packet(PF_BRIDGE, hooknr, skb, in, out, &li,
+			      "%s", info->prefix);
+	else
+		ebt_log_packet(PF_BRIDGE, hooknr, skb, in, out, &li,
+			       info->prefix);
+}
+
+static struct ebt_watcher log =
+{
+	.name		= EBT_LOG_WATCHER,
+	.watcher	= ebt_log,
+	.check		= ebt_log_check,
+	.me		= THIS_MODULE,
+};
+
+static struct nf_logger ebt_log_logger = {
+	.name 		= "ebt_log",
+	.logfn		= &ebt_log_packet,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_log_init(void)
+{
+	int ret;
+
+	ret = ebt_register_watcher(&log);
+	if (ret < 0)
+		return ret;
+	if (nf_log_register(PF_BRIDGE, &ebt_log_logger) < 0) {
+		printk(KERN_WARNING "ebt_log: not logging via system console "
+		       "since somebody else already registered for PF_INET\n");
+		/* we cannot make module load fail here, since otherwise
+		 * ebtables userspace would abort */
+	}
+
+	return 0;
+}
+
+static void __exit ebt_log_fini(void)
+{
+	nf_log_unregister(&ebt_log_logger);
+	ebt_unregister_watcher(&log);
+}
+
+module_init(ebt_log_init);
+module_exit(ebt_log_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebt_mark.c

@@ -0,0 +1,80 @@
+/*
+ *  ebt_mark
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  July, 2002
+ *
+ */
+
+/* The mark target can be used in any chain,
+ * I believe adding a mangle table just for marking is total overkill.
+ * Marking a frame doesn't really change anything in the frame anyway.
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_mark_t.h>
+#include <linux/module.h>
+
+static int ebt_target_mark(struct sk_buff **pskb, unsigned int hooknr,
+   const struct net_device *in, const struct net_device *out,
+   const void *data, unsigned int datalen)
+{
+	struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)data;
+	int action = info->target & -16;
+
+	if (action == MARK_SET_VALUE)
+		(*pskb)->mark = info->mark;
+	else if (action == MARK_OR_VALUE)
+		(*pskb)->mark |= info->mark;
+	else if (action == MARK_AND_VALUE)
+		(*pskb)->mark &= info->mark;
+	else
+		(*pskb)->mark ^= info->mark;
+
+	return info->target | ~EBT_VERDICT_BITS;
+}
+
+static int ebt_target_mark_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)data;
+	int tmp;
+
+	if (datalen != EBT_ALIGN(sizeof(struct ebt_mark_t_info)))
+		return -EINVAL;
+	tmp = info->target | ~EBT_VERDICT_BITS;
+	if (BASE_CHAIN && tmp == EBT_RETURN)
+		return -EINVAL;
+	CLEAR_BASE_CHAIN_BIT;
+	if (tmp < -NUM_STANDARD_TARGETS || tmp >= 0)
+		return -EINVAL;
+	tmp = info->target & ~EBT_VERDICT_BITS;
+	if (tmp != MARK_SET_VALUE && tmp != MARK_OR_VALUE &&
+	    tmp != MARK_AND_VALUE && tmp != MARK_XOR_VALUE)
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_target mark_target =
+{
+	.name		= EBT_MARK_TARGET,
+	.target		= ebt_target_mark,
+	.check		= ebt_target_mark_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_mark_init(void)
+{
+	return ebt_register_target(&mark_target);
+}
+
+static void __exit ebt_mark_fini(void)
+{
+	ebt_unregister_target(&mark_target);
+}
+
+module_init(ebt_mark_init);
+module_exit(ebt_mark_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebt_mark_m.c

@@ -0,0 +1,62 @@
+/*
+ *  ebt_mark_m
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  July, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_mark_m.h>
+#include <linux/module.h>
+
+static int ebt_filter_mark(const struct sk_buff *skb,
+   const struct net_device *in, const struct net_device *out, const void *data,
+   unsigned int datalen)
+{
+	struct ebt_mark_m_info *info = (struct ebt_mark_m_info *) data;
+
+	if (info->bitmask & EBT_MARK_OR)
+		return !(!!(skb->mark & info->mask) ^ info->invert);
+	return !(((skb->mark & info->mask) == info->mark) ^ info->invert);
+}
+
+static int ebt_mark_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_mark_m_info *info = (struct ebt_mark_m_info *) data;
+
+	if (datalen != EBT_ALIGN(sizeof(struct ebt_mark_m_info)))
+		return -EINVAL;
+	if (info->bitmask & ~EBT_MARK_MASK)
+		return -EINVAL;
+	if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND))
+		return -EINVAL;
+	if (!info->bitmask)
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_match filter_mark =
+{
+	.name		= EBT_MARK_MATCH,
+	.match		= ebt_filter_mark,
+	.check		= ebt_mark_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_mark_m_init(void)
+{
+	return ebt_register_match(&filter_mark);
+}
+
+static void __exit ebt_mark_m_fini(void)
+{
+	ebt_unregister_match(&filter_mark);
+}
+
+module_init(ebt_mark_m_init);
+module_exit(ebt_mark_m_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebt_pkttype.c

@@ -0,0 +1,59 @@
+/*
+ *  ebt_pkttype
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  April, 2003
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_pkttype.h>
+#include <linux/module.h>
+
+static int ebt_filter_pkttype(const struct sk_buff *skb,
+   const struct net_device *in,
+   const struct net_device *out,
+   const void *data,
+   unsigned int datalen)
+{
+	struct ebt_pkttype_info *info = (struct ebt_pkttype_info *)data;
+
+	return (skb->pkt_type != info->pkt_type) ^ info->invert;
+}
+
+static int ebt_pkttype_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_pkttype_info *info = (struct ebt_pkttype_info *)data;
+
+	if (datalen != EBT_ALIGN(sizeof(struct ebt_pkttype_info)))
+		return -EINVAL;
+	if (info->invert != 0 && info->invert != 1)
+		return -EINVAL;
+	/* Allow any pkt_type value */
+	return 0;
+}
+
+static struct ebt_match filter_pkttype =
+{
+	.name		= EBT_PKTTYPE_MATCH,
+	.match		= ebt_filter_pkttype,
+	.check		= ebt_pkttype_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_pkttype_init(void)
+{
+	return ebt_register_match(&filter_pkttype);
+}
+
+static void __exit ebt_pkttype_fini(void)
+{
+	ebt_unregister_match(&filter_pkttype);
+}
+
+module_init(ebt_pkttype_init);
+module_exit(ebt_pkttype_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebt_redirect.c

@@ -0,0 +1,81 @@
+/*
+ *  ebt_redirect
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  April, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_redirect.h>
+#include <linux/module.h>
+#include <net/sock.h>
+#include "../br_private.h"
+
+static int ebt_target_redirect(struct sk_buff **pskb, unsigned int hooknr,
+   const struct net_device *in, const struct net_device *out,
+   const void *data, unsigned int datalen)
+{
+	struct ebt_redirect_info *info = (struct ebt_redirect_info *)data;
+
+	if (skb_shared(*pskb) || skb_cloned(*pskb)) {
+		struct sk_buff *nskb;
+
+		nskb = skb_copy(*pskb, GFP_ATOMIC);
+		if (!nskb)
+			return NF_DROP;
+		if ((*pskb)->sk)
+			skb_set_owner_w(nskb, (*pskb)->sk);
+		kfree_skb(*pskb);
+		*pskb = nskb;
+	}
+	if (hooknr != NF_BR_BROUTING)
+		memcpy(eth_hdr(*pskb)->h_dest,
+		       in->br_port->br->dev->dev_addr, ETH_ALEN);
+	else
+		memcpy(eth_hdr(*pskb)->h_dest, in->dev_addr, ETH_ALEN);
+	(*pskb)->pkt_type = PACKET_HOST;
+	return info->target;
+}
+
+static int ebt_target_redirect_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_redirect_info *info = (struct ebt_redirect_info *)data;
+
+	if (datalen != EBT_ALIGN(sizeof(struct ebt_redirect_info)))
+		return -EINVAL;
+	if (BASE_CHAIN && info->target == EBT_RETURN)
+		return -EINVAL;
+	CLEAR_BASE_CHAIN_BIT;
+	if ( (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING)) &&
+	     (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) )
+		return -EINVAL;
+	if (INVALID_TARGET)
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_target redirect_target =
+{
+	.name		= EBT_REDIRECT_TARGET,
+	.target		= ebt_target_redirect,
+	.check		= ebt_target_redirect_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_redirect_init(void)
+{
+	return ebt_register_target(&redirect_target);
+}
+
+static void __exit ebt_redirect_fini(void)
+{
+	ebt_unregister_target(&redirect_target);
+}
+
+module_init(ebt_redirect_init);
+module_exit(ebt_redirect_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebt_snat.c

@@ -0,0 +1,97 @@
+/*
+ *  ebt_snat
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  June, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_nat.h>
+#include <linux/module.h>
+#include <net/sock.h>
+#include <linux/if_arp.h>
+#include <net/arp.h>
+
+static int ebt_target_snat(struct sk_buff **pskb, unsigned int hooknr,
+   const struct net_device *in, const struct net_device *out,
+   const void *data, unsigned int datalen)
+{
+	struct ebt_nat_info *info = (struct ebt_nat_info *) data;
+
+	if (skb_shared(*pskb) || skb_cloned(*pskb)) {
+		struct sk_buff *nskb;
+
+		nskb = skb_copy(*pskb, GFP_ATOMIC);
+		if (!nskb)
+			return NF_DROP;
+		if ((*pskb)->sk)
+			skb_set_owner_w(nskb, (*pskb)->sk);
+		kfree_skb(*pskb);
+		*pskb = nskb;
+	}
+	memcpy(eth_hdr(*pskb)->h_source, info->mac, ETH_ALEN);
+	if (!(info->target & NAT_ARP_BIT) &&
+	    eth_hdr(*pskb)->h_proto == htons(ETH_P_ARP)) {
+		struct arphdr _ah, *ap;
+
+		ap = skb_header_pointer(*pskb, 0, sizeof(_ah), &_ah);
+		if (ap == NULL)
+			return EBT_DROP;
+		if (ap->ar_hln != ETH_ALEN)
+			goto out;
+		if (skb_store_bits(*pskb, sizeof(_ah), info->mac,ETH_ALEN))
+			return EBT_DROP;
+	}
+out:
+	return info->target | ~EBT_VERDICT_BITS;
+}
+
+static int ebt_target_snat_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_nat_info *info = (struct ebt_nat_info *) data;
+	int tmp;
+
+	if (datalen != EBT_ALIGN(sizeof(struct ebt_nat_info)))
+		return -EINVAL;
+	tmp = info->target | ~EBT_VERDICT_BITS;
+	if (BASE_CHAIN && tmp == EBT_RETURN)
+		return -EINVAL;
+	CLEAR_BASE_CHAIN_BIT;
+	if (strcmp(tablename, "nat"))
+		return -EINVAL;
+	if (hookmask & ~(1 << NF_BR_POST_ROUTING))
+		return -EINVAL;
+
+	if (tmp < -NUM_STANDARD_TARGETS || tmp >= 0)
+		return -EINVAL;
+	tmp = info->target | EBT_VERDICT_BITS;
+	if ((tmp & ~NAT_ARP_BIT) != ~NAT_ARP_BIT)
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_target snat =
+{
+	.name		= EBT_SNAT_TARGET,
+	.target		= ebt_target_snat,
+	.check		= ebt_target_snat_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_snat_init(void)
+{
+	return ebt_register_target(&snat);
+}
+
+static void __exit ebt_snat_fini(void)
+{
+	ebt_unregister_target(&snat);
+}
+
+module_init(ebt_snat_init);
+module_exit(ebt_snat_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebt_stp.c

@@ -0,0 +1,195 @@
+/*
+ *  ebt_stp
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *	Stephen Hemminger <shemminger@osdl.org>
+ *
+ *  July, 2003
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_stp.h>
+#include <linux/etherdevice.h>
+#include <linux/module.h>
+
+#define BPDU_TYPE_CONFIG 0
+#define BPDU_TYPE_TCN 0x80
+
+struct stp_header {
+	uint8_t dsap;
+	uint8_t ssap;
+	uint8_t ctrl;
+	uint8_t pid;
+	uint8_t vers;
+	uint8_t type;
+};
+
+struct stp_config_pdu {
+	uint8_t flags;
+	uint8_t root[8];
+	uint8_t root_cost[4];
+	uint8_t sender[8];
+	uint8_t port[2];
+	uint8_t msg_age[2];
+	uint8_t max_age[2];
+	uint8_t hello_time[2];
+	uint8_t forward_delay[2];
+};
+
+#define NR16(p) (p[0] << 8 | p[1])
+#define NR32(p) ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3])
+
+static int ebt_filter_config(struct ebt_stp_info *info,
+   struct stp_config_pdu *stpc)
+{
+	struct ebt_stp_config_info *c;
+	uint16_t v16;
+	uint32_t v32;
+	int verdict, i;
+
+	c = &info->config;
+	if ((info->bitmask & EBT_STP_FLAGS) &&
+	    FWINV(c->flags != stpc->flags, EBT_STP_FLAGS))
+		return EBT_NOMATCH;
+	if (info->bitmask & EBT_STP_ROOTPRIO) {
+		v16 = NR16(stpc->root);
+		if (FWINV(v16 < c->root_priol ||
+		    v16 > c->root_priou, EBT_STP_ROOTPRIO))
+			return EBT_NOMATCH;
+	}
+	if (info->bitmask & EBT_STP_ROOTADDR) {
+		verdict = 0;
+		for (i = 0; i < 6; i++)
+			verdict |= (stpc->root[2+i] ^ c->root_addr[i]) &
+				   c->root_addrmsk[i];
+		if (FWINV(verdict != 0, EBT_STP_ROOTADDR))
+			return EBT_NOMATCH;
+	}
+	if (info->bitmask & EBT_STP_ROOTCOST) {
+		v32 = NR32(stpc->root_cost);
+		if (FWINV(v32 < c->root_costl ||
+		    v32 > c->root_costu, EBT_STP_ROOTCOST))
+			return EBT_NOMATCH;
+	}
+	if (info->bitmask & EBT_STP_SENDERPRIO) {
+		v16 = NR16(stpc->sender);
+		if (FWINV(v16 < c->sender_priol ||
+		    v16 > c->sender_priou, EBT_STP_SENDERPRIO))
+			return EBT_NOMATCH;
+	}
+	if (info->bitmask & EBT_STP_SENDERADDR) {
+		verdict = 0;
+		for (i = 0; i < 6; i++)
+			verdict |= (stpc->sender[2+i] ^ c->sender_addr[i]) &
+				   c->sender_addrmsk[i];
+		if (FWINV(verdict != 0, EBT_STP_SENDERADDR))
+			return EBT_NOMATCH;
+	}
+	if (info->bitmask & EBT_STP_PORT) {
+		v16 = NR16(stpc->port);
+		if (FWINV(v16 < c->portl ||
+		    v16 > c->portu, EBT_STP_PORT))
+			return EBT_NOMATCH;
+	}
+	if (info->bitmask & EBT_STP_MSGAGE) {
+		v16 = NR16(stpc->msg_age);
+		if (FWINV(v16 < c->msg_agel ||
+		    v16 > c->msg_ageu, EBT_STP_MSGAGE))
+			return EBT_NOMATCH;
+	}
+	if (info->bitmask & EBT_STP_MAXAGE) {
+		v16 = NR16(stpc->max_age);
+		if (FWINV(v16 < c->max_agel ||
+		    v16 > c->max_ageu, EBT_STP_MAXAGE))
+			return EBT_NOMATCH;
+	}
+	if (info->bitmask & EBT_STP_HELLOTIME) {
+		v16 = NR16(stpc->hello_time);
+		if (FWINV(v16 < c->hello_timel ||
+		    v16 > c->hello_timeu, EBT_STP_HELLOTIME))
+			return EBT_NOMATCH;
+	}
+	if (info->bitmask & EBT_STP_FWDD) {
+		v16 = NR16(stpc->forward_delay);
+		if (FWINV(v16 < c->forward_delayl ||
+		    v16 > c->forward_delayu, EBT_STP_FWDD))
+			return EBT_NOMATCH;
+	}
+	return EBT_MATCH;
+}
+
+static int ebt_filter_stp(const struct sk_buff *skb, const struct net_device *in,
+   const struct net_device *out, const void *data, unsigned int datalen)
+{
+	struct ebt_stp_info *info = (struct ebt_stp_info *)data;
+	struct stp_header _stph, *sp;
+	uint8_t header[6] = {0x42, 0x42, 0x03, 0x00, 0x00, 0x00};
+
+	sp = skb_header_pointer(skb, 0, sizeof(_stph), &_stph);
+	if (sp == NULL)
+		return EBT_NOMATCH;
+
+	/* The stp code only considers these */
+	if (memcmp(sp, header, sizeof(header)))
+		return EBT_NOMATCH;
+
+	if (info->bitmask & EBT_STP_TYPE
+	    && FWINV(info->type != sp->type, EBT_STP_TYPE))
+		return EBT_NOMATCH;
+
+	if (sp->type == BPDU_TYPE_CONFIG &&
+	    info->bitmask & EBT_STP_CONFIG_MASK) {
+		struct stp_config_pdu _stpc, *st;
+
+		st = skb_header_pointer(skb, sizeof(_stph),
+					sizeof(_stpc), &_stpc);
+		if (st == NULL)
+			return EBT_NOMATCH;
+		return ebt_filter_config(info, st);
+	}
+	return EBT_MATCH;
+}
+
+static int ebt_stp_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_stp_info *info = (struct ebt_stp_info *)data;
+	int len = EBT_ALIGN(sizeof(struct ebt_stp_info));
+	uint8_t bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
+	uint8_t msk[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+
+	if (info->bitmask & ~EBT_STP_MASK || info->invflags & ~EBT_STP_MASK ||
+	    !(info->bitmask & EBT_STP_MASK))
+		return -EINVAL;
+	if (datalen != len)
+		return -EINVAL;
+	/* Make sure the match only receives stp frames */
+	if (compare_ether_addr(e->destmac, bridge_ula) ||
+	    compare_ether_addr(e->destmsk, msk) || !(e->bitmask & EBT_DESTMAC))
+		return -EINVAL;
+
+	return 0;
+}
+
+static struct ebt_match filter_stp =
+{
+	.name		= EBT_STP_MATCH,
+	.match		= ebt_filter_stp,
+	.check		= ebt_stp_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_stp_init(void)
+{
+	return ebt_register_match(&filter_stp);
+}
+
+static void __exit ebt_stp_fini(void)
+{
+	ebt_unregister_match(&filter_stp);
+}
+
+module_init(ebt_stp_init);
+module_exit(ebt_stp_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebt_ulog.c

@@ -0,0 +1,347 @@
+/*
+ * netfilter module for userspace bridged Ethernet frames logging daemons
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *	Harald Welte <laforge@netfilter.org>
+ *
+ *  November, 2004
+ *
+ * Based on ipt_ULOG.c, which is
+ * (C) 2000-2002 by Harald Welte <laforge@netfilter.org>
+ *
+ * This module accepts two parameters:
+ *
+ * nlbufsiz:
+ *   The parameter specifies how big the buffer for each netlink multicast
+ * group is. e.g. If you say nlbufsiz=8192, up to eight kb of packets will
+ * get accumulated in the kernel until they are sent to userspace. It is
+ * NOT possible to allocate more than 128kB, and it is strongly discouraged,
+ * because atomically allocating 128kB inside the network rx softirq is not
+ * reliable. Please also keep in mind that this buffer size is allocated for
+ * each nlgroup you are using, so the total kernel memory usage increases
+ * by that factor.
+ *
+ * flushtimeout:
+ *   Specify, after how many hundredths of a second the queue should be
+ *   flushed even if it is not full yet.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/socket.h>
+#include <linux/skbuff.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/netlink.h>
+#include <linux/netdevice.h>
+#include <linux/module.h>
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_ulog.h>
+#include <net/sock.h>
+#include "../br_private.h"
+
+#define PRINTR(format, args...) do { if (net_ratelimit()) \
+				printk(format , ## args); } while (0)
+
+static unsigned int nlbufsiz = NLMSG_GOODSIZE;
+module_param(nlbufsiz, uint, 0600);
+MODULE_PARM_DESC(nlbufsiz, "netlink buffer size (number of bytes) "
+			   "(defaults to 4096)");
+
+static unsigned int flushtimeout = 10;
+module_param(flushtimeout, uint, 0600);
+MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths ofa second) "
+			       "(defaults to 10)");
+
+typedef struct {
+	unsigned int qlen;		/* number of nlmsgs' in the skb */
+	struct nlmsghdr *lastnlh;	/* netlink header of last msg in skb */
+	struct sk_buff *skb;		/* the pre-allocated skb */
+	struct timer_list timer;	/* the timer function */
+	spinlock_t lock;		/* the per-queue lock */
+} ebt_ulog_buff_t;
+
+static ebt_ulog_buff_t ulog_buffers[EBT_ULOG_MAXNLGROUPS];
+static struct sock *ebtulognl;
+
+/* send one ulog_buff_t to userspace */
+static void ulog_send(unsigned int nlgroup)
+{
+	ebt_ulog_buff_t *ub = &ulog_buffers[nlgroup];
+
+	if (timer_pending(&ub->timer))
+		del_timer(&ub->timer);
+
+	if (!ub->skb)
+		return;
+
+	/* last nlmsg needs NLMSG_DONE */
+	if (ub->qlen > 1)
+		ub->lastnlh->nlmsg_type = NLMSG_DONE;
+
+	NETLINK_CB(ub->skb).dst_group = nlgroup + 1;
+	netlink_broadcast(ebtulognl, ub->skb, 0, nlgroup + 1, GFP_ATOMIC);
+
+	ub->qlen = 0;
+	ub->skb = NULL;
+}
+
+/* timer function to flush queue in flushtimeout time */
+static void ulog_timer(unsigned long data)
+{
+	spin_lock_bh(&ulog_buffers[data].lock);
+	if (ulog_buffers[data].skb)
+		ulog_send(data);
+	spin_unlock_bh(&ulog_buffers[data].lock);
+}
+
+static struct sk_buff *ulog_alloc_skb(unsigned int size)
+{
+	struct sk_buff *skb;
+	unsigned int n;
+
+	n = max(size, nlbufsiz);
+	skb = alloc_skb(n, GFP_ATOMIC);
+	if (!skb) {
+		PRINTR(KERN_ERR "ebt_ulog: can't alloc whole buffer "
+		       "of size %ub!\n", n);
+		if (n > size) {
+			/* try to allocate only as much as we need for
+			 * current packet */
+			skb = alloc_skb(size, GFP_ATOMIC);
+			if (!skb)
+				PRINTR(KERN_ERR "ebt_ulog: can't even allocate "
+				       "buffer of size %ub\n", size);
+		}
+	}
+
+	return skb;
+}
+
+static void ebt_ulog_packet(unsigned int hooknr, const struct sk_buff *skb,
+   const struct net_device *in, const struct net_device *out,
+   const struct ebt_ulog_info *uloginfo, const char *prefix)
+{
+	ebt_ulog_packet_msg_t *pm;
+	size_t size, copy_len;
+	struct nlmsghdr *nlh;
+	unsigned int group = uloginfo->nlgroup;
+	ebt_ulog_buff_t *ub = &ulog_buffers[group];
+	spinlock_t *lock = &ub->lock;
+
+	if ((uloginfo->cprange == 0) ||
+	    (uloginfo->cprange > skb->len + ETH_HLEN))
+		copy_len = skb->len + ETH_HLEN;
+	else
+		copy_len = uloginfo->cprange;
+
+	size = NLMSG_SPACE(sizeof(*pm) + copy_len);
+	if (size > nlbufsiz) {
+		PRINTR("ebt_ulog: Size %Zd needed, but nlbufsiz=%d\n",
+		       size, nlbufsiz);
+		return;
+	}
+
+	spin_lock_bh(lock);
+
+	if (!ub->skb) {
+		if (!(ub->skb = ulog_alloc_skb(size)))
+			goto alloc_failure;
+	} else if (size > skb_tailroom(ub->skb)) {
+		ulog_send(group);
+
+		if (!(ub->skb = ulog_alloc_skb(size)))
+			goto alloc_failure;
+	}
+
+	nlh = NLMSG_PUT(ub->skb, 0, ub->qlen, 0,
+			size - NLMSG_ALIGN(sizeof(*nlh)));
+	ub->qlen++;
+
+	pm = NLMSG_DATA(nlh);
+
+	/* Fill in the ulog data */
+	pm->version = EBT_ULOG_VERSION;
+	do_gettimeofday(&pm->stamp);
+	if (ub->qlen == 1)
+		skb_set_timestamp(ub->skb, &pm->stamp);
+	pm->data_len = copy_len;
+	pm->mark = skb->mark;
+	pm->hook = hooknr;
+	if (uloginfo->prefix != NULL)
+		strcpy(pm->prefix, uloginfo->prefix);
+	else
+		*(pm->prefix) = '\0';
+
+	if (in) {
+		strcpy(pm->physindev, in->name);
+		/* If in isn't a bridge, then physindev==indev */
+		if (in->br_port)
+			strcpy(pm->indev, in->br_port->br->dev->name);
+		else
+			strcpy(pm->indev, in->name);
+	} else
+		pm->indev[0] = pm->physindev[0] = '\0';
+
+	if (out) {
+		/* If out exists, then out is a bridge port */
+		strcpy(pm->physoutdev, out->name);
+		strcpy(pm->outdev, out->br_port->br->dev->name);
+	} else
+		pm->outdev[0] = pm->physoutdev[0] = '\0';
+
+	if (skb_copy_bits(skb, -ETH_HLEN, pm->data, copy_len) < 0)
+		BUG();
+
+	if (ub->qlen > 1)
+		ub->lastnlh->nlmsg_flags |= NLM_F_MULTI;
+
+	ub->lastnlh = nlh;
+
+	if (ub->qlen >= uloginfo->qthreshold)
+		ulog_send(group);
+	else if (!timer_pending(&ub->timer)) {
+		ub->timer.expires = jiffies + flushtimeout * HZ / 100;
+		add_timer(&ub->timer);
+	}
+
+unlock:
+	spin_unlock_bh(lock);
+
+	return;
+
+nlmsg_failure:
+	printk(KERN_CRIT "ebt_ulog: error during NLMSG_PUT. This should "
+	       "not happen, please report to author.\n");
+	goto unlock;
+alloc_failure:
+	goto unlock;
+}
+
+/* this function is registered with the netfilter core */
+static void ebt_log_packet(unsigned int pf, unsigned int hooknum,
+   const struct sk_buff *skb, const struct net_device *in,
+   const struct net_device *out, const struct nf_loginfo *li,
+   const char *prefix)
+{
+	struct ebt_ulog_info loginfo;
+
+	if (!li || li->type != NF_LOG_TYPE_ULOG) {
+		loginfo.nlgroup = EBT_ULOG_DEFAULT_NLGROUP;
+		loginfo.cprange = 0;
+		loginfo.qthreshold = EBT_ULOG_DEFAULT_QTHRESHOLD;
+		loginfo.prefix[0] = '\0';
+	} else {
+		loginfo.nlgroup = li->u.ulog.group;
+		loginfo.cprange = li->u.ulog.copy_len;
+		loginfo.qthreshold = li->u.ulog.qthreshold;
+		strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix));
+	}
+
+	ebt_ulog_packet(hooknum, skb, in, out, &loginfo, prefix);
+}
+
+static void ebt_ulog(const struct sk_buff *skb, unsigned int hooknr,
+   const struct net_device *in, const struct net_device *out,
+   const void *data, unsigned int datalen)
+{
+	struct ebt_ulog_info *uloginfo = (struct ebt_ulog_info *)data;
+
+	ebt_ulog_packet(hooknr, skb, in, out, uloginfo, NULL);
+}
+
+
+static int ebt_ulog_check(const char *tablename, unsigned int hookmask,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_ulog_info *uloginfo = (struct ebt_ulog_info *)data;
+
+	if (datalen != EBT_ALIGN(sizeof(struct ebt_ulog_info)) ||
+	    uloginfo->nlgroup > 31)
+		return -EINVAL;
+
+	uloginfo->prefix[EBT_ULOG_PREFIX_LEN - 1] = '\0';
+
+	if (uloginfo->qthreshold > EBT_ULOG_MAX_QLEN)
+		uloginfo->qthreshold = EBT_ULOG_MAX_QLEN;
+
+	return 0;
+}
+
+static struct ebt_watcher ulog = {
+	.name		= EBT_ULOG_WATCHER,
+	.watcher	= ebt_ulog,
+	.check		= ebt_ulog_check,
+	.me		= THIS_MODULE,
+};
+
+static struct nf_logger ebt_ulog_logger = {
+	.name		= EBT_ULOG_WATCHER,
+	.logfn		= &ebt_log_packet,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_ulog_init(void)
+{
+	int i, ret = 0;
+
+	if (nlbufsiz >= 128*1024) {
+		printk(KERN_NOTICE "ebt_ulog: Netlink buffer has to be <= 128kB,"
+		       " please try a smaller nlbufsiz parameter.\n");
+		return -EINVAL;
+	}
+
+	/* initialize ulog_buffers */
+	for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
+		init_timer(&ulog_buffers[i].timer);
+		ulog_buffers[i].timer.function = ulog_timer;
+		ulog_buffers[i].timer.data = i;
+		spin_lock_init(&ulog_buffers[i].lock);
+	}
+
+	ebtulognl = netlink_kernel_create(NETLINK_NFLOG, EBT_ULOG_MAXNLGROUPS,
+					  NULL, THIS_MODULE);
+	if (!ebtulognl)
+		ret = -ENOMEM;
+	else if ((ret = ebt_register_watcher(&ulog)))
+		sock_release(ebtulognl->sk_socket);
+
+	if (nf_log_register(PF_BRIDGE, &ebt_ulog_logger) < 0) {
+		printk(KERN_WARNING "ebt_ulog: not logging via ulog "
+		       "since somebody else already registered for PF_BRIDGE\n");
+		/* we cannot make module load fail here, since otherwise
+		 * ebtables userspace would abort */
+	}
+
+	return ret;
+}
+
+static void __exit ebt_ulog_fini(void)
+{
+	ebt_ulog_buff_t *ub;
+	int i;
+
+	nf_log_unregister(&ebt_ulog_logger);
+	ebt_unregister_watcher(&ulog);
+	for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
+		ub = &ulog_buffers[i];
+		if (timer_pending(&ub->timer))
+			del_timer(&ub->timer);
+		spin_lock_bh(&ub->lock);
+		if (ub->skb) {
+			kfree_skb(ub->skb);
+			ub->skb = NULL;
+		}
+		spin_unlock_bh(&ub->lock);
+	}
+	sock_release(ebtulognl->sk_socket);
+}
+
+module_init(ebt_ulog_init);
+module_exit(ebt_ulog_fini);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>");
+MODULE_DESCRIPTION("ebtables userspace logging module for bridged Ethernet"
+		   " frames");

net/bridge/netfilter/ebt_vlan.c

@@ -0,0 +1,195 @@
+/*
+ * Description: EBTables 802.1Q match extension kernelspace module.
+ * Authors: Nick Fedchik <nick@fedchik.org.ua>
+ *          Bart De Schuymer <bdschuym@pandora.be>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_vlan.h>
+
+static int debug;
+#define MODULE_VERS "0.6"
+
+module_param(debug, int, 0);
+MODULE_PARM_DESC(debug, "debug=1 is turn on debug messages");
+MODULE_AUTHOR("Nick Fedchik <nick@fedchik.org.ua>");
+MODULE_DESCRIPTION("802.1Q match module (ebtables extension), v"
+		   MODULE_VERS);
+MODULE_LICENSE("GPL");
+
+
+#define DEBUG_MSG(args...) if (debug) printk (KERN_DEBUG "ebt_vlan: " args)
+#define INV_FLAG(_inv_flag_) (info->invflags & _inv_flag_) ? "!" : ""
+#define GET_BITMASK(_BIT_MASK_) info->bitmask & _BIT_MASK_
+#define SET_BITMASK(_BIT_MASK_) info->bitmask |= _BIT_MASK_
+#define EXIT_ON_MISMATCH(_MATCH_,_MASK_) {if (!((info->_MATCH_ == _MATCH_)^!!(info->invflags & _MASK_))) return EBT_NOMATCH;}
+
+static int
+ebt_filter_vlan(const struct sk_buff *skb,
+		const struct net_device *in,
+		const struct net_device *out,
+		const void *data, unsigned int datalen)
+{
+	struct ebt_vlan_info *info = (struct ebt_vlan_info *) data;
+	struct vlan_hdr _frame, *fp;
+
+	unsigned short TCI;	/* Whole TCI, given from parsed frame */
+	unsigned short id;	/* VLAN ID, given from frame TCI */
+	unsigned char prio;	/* user_priority, given from frame TCI */
+	/* VLAN encapsulated Type/Length field, given from orig frame */
+	__be16 encap;
+
+	fp = skb_header_pointer(skb, 0, sizeof(_frame), &_frame);
+	if (fp == NULL)
+		return EBT_NOMATCH;
+
+	/* Tag Control Information (TCI) consists of the following elements:
+	 * - User_priority. The user_priority field is three bits in length,
+	 * interpreted as a binary number.
+	 * - Canonical Format Indicator (CFI). The Canonical Format Indicator
+	 * (CFI) is a single bit flag value. Currently ignored.
+	 * - VLAN Identifier (VID). The VID is encoded as
+	 * an unsigned binary number. */
+	TCI = ntohs(fp->h_vlan_TCI);
+	id = TCI & VLAN_VID_MASK;
+	prio = (TCI >> 13) & 0x7;
+	encap = fp->h_vlan_encapsulated_proto;
+
+	/* Checking VLAN Identifier (VID) */
+	if (GET_BITMASK(EBT_VLAN_ID))
+		EXIT_ON_MISMATCH(id, EBT_VLAN_ID);
+
+	/* Checking user_priority */
+	if (GET_BITMASK(EBT_VLAN_PRIO))
+		EXIT_ON_MISMATCH(prio, EBT_VLAN_PRIO);
+
+	/* Checking Encapsulated Proto (Length/Type) field */
+	if (GET_BITMASK(EBT_VLAN_ENCAP))
+		EXIT_ON_MISMATCH(encap, EBT_VLAN_ENCAP);
+
+	return EBT_MATCH;
+}
+
+static int
+ebt_check_vlan(const char *tablename,
+	       unsigned int hooknr,
+	       const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_vlan_info *info = (struct ebt_vlan_info *) data;
+
+	/* Parameters buffer overflow check */
+	if (datalen != EBT_ALIGN(sizeof(struct ebt_vlan_info))) {
+		DEBUG_MSG
+		    ("passed size %d is not eq to ebt_vlan_info (%Zd)\n",
+		     datalen, sizeof(struct ebt_vlan_info));
+		return -EINVAL;
+	}
+
+	/* Is it 802.1Q frame checked? */
+	if (e->ethproto != htons(ETH_P_8021Q)) {
+		DEBUG_MSG
+		    ("passed entry proto %2.4X is not 802.1Q (8100)\n",
+		     (unsigned short) ntohs(e->ethproto));
+		return -EINVAL;
+	}
+
+	/* Check for bitmask range
+	 * True if even one bit is out of mask */
+	if (info->bitmask & ~EBT_VLAN_MASK) {
+		DEBUG_MSG("bitmask %2X is out of mask (%2X)\n",
+			  info->bitmask, EBT_VLAN_MASK);
+		return -EINVAL;
+	}
+
+	/* Check for inversion flags range */
+	if (info->invflags & ~EBT_VLAN_MASK) {
+		DEBUG_MSG("inversion flags %2X is out of mask (%2X)\n",
+			  info->invflags, EBT_VLAN_MASK);
+		return -EINVAL;
+	}
+
+	/* Reserved VLAN ID (VID) values
+	 * -----------------------------
+	 * 0 - The null VLAN ID.
+	 * 1 - The default Port VID (PVID)
+	 * 0x0FFF - Reserved for implementation use.
+	 * if_vlan.h: VLAN_GROUP_ARRAY_LEN 4096. */
+	if (GET_BITMASK(EBT_VLAN_ID)) {
+		if (!!info->id) { /* if id!=0 => check vid range */
+			if (info->id > VLAN_GROUP_ARRAY_LEN) {
+				DEBUG_MSG
+				    ("id %d is out of range (1-4096)\n",
+				     info->id);
+				return -EINVAL;
+			}
+			/* Note: This is valid VLAN-tagged frame point.
+			 * Any value of user_priority are acceptable,
+			 * but should be ignored according to 802.1Q Std.
+			 * So we just drop the prio flag. */
+			info->bitmask &= ~EBT_VLAN_PRIO;
+		}
+		/* Else, id=0 (null VLAN ID)  => user_priority range (any?) */
+	}
+
+	if (GET_BITMASK(EBT_VLAN_PRIO)) {
+		if ((unsigned char) info->prio > 7) {
+			DEBUG_MSG("prio %d is out of range (0-7)\n",
+			     info->prio);
+			return -EINVAL;
+		}
+	}
+	/* Check for encapsulated proto range - it is possible to be
+	 * any value for u_short range.
+	 * if_ether.h:  ETH_ZLEN        60   -  Min. octets in frame sans FCS */
+	if (GET_BITMASK(EBT_VLAN_ENCAP)) {
+		if ((unsigned short) ntohs(info->encap) < ETH_ZLEN) {
+			DEBUG_MSG
+			    ("encap frame length %d is less than minimal\n",
+			     ntohs(info->encap));
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static struct ebt_match filter_vlan = {
+	.name		= EBT_VLAN_MATCH,
+	.match		= ebt_filter_vlan,
+	.check		= ebt_check_vlan,
+	.me		= THIS_MODULE,
+};
+
+static int __init ebt_vlan_init(void)
+{
+	DEBUG_MSG("ebtables 802.1Q extension module v"
+		  MODULE_VERS "\n");
+	DEBUG_MSG("module debug=%d\n", !!debug);
+	return ebt_register_match(&filter_vlan);
+}
+
+static void __exit ebt_vlan_fini(void)
+{
+	ebt_unregister_match(&filter_vlan);
+}
+
+module_init(ebt_vlan_init);
+module_exit(ebt_vlan_fini);

net/bridge/netfilter/ebtable_broute.c

@@ -0,0 +1,86 @@
+/*
+ *  ebtable_broute
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  April, 2002
+ *
+ *  This table lets you choose between routing and bridging for frames
+ *  entering on a bridge enslaved nic. This table is traversed before any
+ *  other ebtables table. See net/bridge/br_input.c.
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/module.h>
+#include <linux/if_bridge.h>
+
+/* EBT_ACCEPT means the frame will be bridged
+ * EBT_DROP means the frame will be routed
+ */
+static struct ebt_entries initial_chain = {
+	.name		= "BROUTING",
+	.policy		= EBT_ACCEPT,
+};
+
+static struct ebt_replace_kernel initial_table =
+{
+	.name		= "broute",
+	.valid_hooks	= 1 << NF_BR_BROUTING,
+	.entries_size	= sizeof(struct ebt_entries),
+	.hook_entry	= {
+		[NF_BR_BROUTING]	= &initial_chain,
+	},
+	.entries	= (char *)&initial_chain,
+};
+
+static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
+{
+	if (valid_hooks & ~(1 << NF_BR_BROUTING))
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_table broute_table =
+{
+	.name		= "broute",
+	.table		= &initial_table,
+	.valid_hooks	= 1 << NF_BR_BROUTING,
+	.lock		= RW_LOCK_UNLOCKED,
+	.check		= check,
+	.me		= THIS_MODULE,
+};
+
+static int ebt_broute(struct sk_buff **pskb)
+{
+	int ret;
+
+	ret = ebt_do_table(NF_BR_BROUTING, pskb, (*pskb)->dev, NULL,
+	   &broute_table);
+	if (ret == NF_DROP)
+		return 1; /* route it */
+	return 0; /* bridge it */
+}
+
+static int __init ebtable_broute_init(void)
+{
+	int ret;
+
+	ret = ebt_register_table(&broute_table);
+	if (ret < 0)
+		return ret;
+	/* see br_input.c */
+	br_should_route_hook = ebt_broute;
+	return ret;
+}
+
+static void __exit ebtable_broute_fini(void)
+{
+	br_should_route_hook = NULL;
+	synchronize_net();
+	ebt_unregister_table(&broute_table);
+}
+
+module_init(ebtable_broute_init);
+module_exit(ebtable_broute_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebtable_filter.c

@@ -0,0 +1,123 @@
+/*
+ *  ebtable_filter
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  April, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/module.h>
+
+#define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
+   (1 << NF_BR_LOCAL_OUT))
+
+static struct ebt_entries initial_chains[] =
+{
+	{
+		.name	= "INPUT",
+		.policy	= EBT_ACCEPT,
+	},
+	{
+		.name	= "FORWARD",
+		.policy	= EBT_ACCEPT,
+	},
+	{
+		.name	= "OUTPUT",
+		.policy	= EBT_ACCEPT,
+	},
+};
+
+static struct ebt_replace_kernel initial_table =
+{
+	.name		= "filter",
+	.valid_hooks	= FILTER_VALID_HOOKS,
+	.entries_size	= 3 * sizeof(struct ebt_entries),
+	.hook_entry	= {
+		[NF_BR_LOCAL_IN]	= &initial_chains[0],
+		[NF_BR_FORWARD]		= &initial_chains[1],
+		[NF_BR_LOCAL_OUT]	= &initial_chains[2],
+	},
+	.entries	= (char *)initial_chains,
+};
+
+static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
+{
+	if (valid_hooks & ~FILTER_VALID_HOOKS)
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_table frame_filter =
+{
+	.name		= "filter",
+	.table		= &initial_table,
+	.valid_hooks	= FILTER_VALID_HOOKS,
+	.lock		= RW_LOCK_UNLOCKED,
+	.check		= check,
+	.me		= THIS_MODULE,
+};
+
+static unsigned int
+ebt_hook (unsigned int hook, struct sk_buff **pskb, const struct net_device *in,
+   const struct net_device *out, int (*okfn)(struct sk_buff *))
+{
+	return ebt_do_table(hook, pskb, in, out, &frame_filter);
+}
+
+static struct nf_hook_ops ebt_ops_filter[] = {
+	{
+		.hook		= ebt_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_BRIDGE,
+		.hooknum	= NF_BR_LOCAL_IN,
+		.priority	= NF_BR_PRI_FILTER_BRIDGED,
+	},
+	{
+		.hook		= ebt_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_BRIDGE,
+		.hooknum	= NF_BR_FORWARD,
+		.priority	= NF_BR_PRI_FILTER_BRIDGED,
+	},
+	{
+		.hook		= ebt_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_BRIDGE,
+		.hooknum	= NF_BR_LOCAL_OUT,
+		.priority	= NF_BR_PRI_FILTER_OTHER,
+	},
+};
+
+static int __init ebtable_filter_init(void)
+{
+	int i, j, ret;
+
+	ret = ebt_register_table(&frame_filter);
+	if (ret < 0)
+		return ret;
+	for (i = 0; i < ARRAY_SIZE(ebt_ops_filter); i++)
+		if ((ret = nf_register_hook(&ebt_ops_filter[i])) < 0)
+			goto cleanup;
+	return ret;
+cleanup:
+	for (j = 0; j < i; j++)
+		nf_unregister_hook(&ebt_ops_filter[j]);
+	ebt_unregister_table(&frame_filter);
+	return ret;
+}
+
+static void __exit ebtable_filter_fini(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ebt_ops_filter); i++)
+		nf_unregister_hook(&ebt_ops_filter[i]);
+	ebt_unregister_table(&frame_filter);
+}
+
+module_init(ebtable_filter_init);
+module_exit(ebtable_filter_fini);
+MODULE_LICENSE("GPL");

net/bridge/netfilter/ebtable_nat.c

@@ -0,0 +1,130 @@
+/*
+ *  ebtable_nat
+ *
+ *	Authors:
+ *	Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  April, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/module.h>
+
+#define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT) | \
+   (1 << NF_BR_POST_ROUTING))
+
+static struct ebt_entries initial_chains[] =
+{
+	{
+		.name	= "PREROUTING",
+		.policy	= EBT_ACCEPT,
+	},
+	{
+		.name	= "OUTPUT",
+		.policy	= EBT_ACCEPT,
+	},
+	{
+		.name	= "POSTROUTING",
+		.policy	= EBT_ACCEPT,
+	}
+};
+
+static struct ebt_replace_kernel initial_table =
+{
+	.name		= "nat",
+	.valid_hooks	= NAT_VALID_HOOKS,
+	.entries_size	= 3 * sizeof(struct ebt_entries),
+	.hook_entry	= {
+		[NF_BR_PRE_ROUTING]	= &initial_chains[0],
+		[NF_BR_LOCAL_OUT]	= &initial_chains[1],
+		[NF_BR_POST_ROUTING]	= &initial_chains[2],
+	},
+	.entries	= (char *)initial_chains,
+};
+
+static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
+{
+	if (valid_hooks & ~NAT_VALID_HOOKS)
+		return -EINVAL;
+	return 0;
+}
+
+static struct ebt_table frame_nat =
+{
+	.name		= "nat",
+	.table		= &initial_table,
+	.valid_hooks	= NAT_VALID_HOOKS,
+	.lock		= RW_LOCK_UNLOCKED,
+	.check		= check,
+	.me		= THIS_MODULE,
+};
+
+static unsigned int
+ebt_nat_dst(unsigned int hook, struct sk_buff **pskb, const struct net_device *in
+   , const struct net_device *out, int (*okfn)(struct sk_buff *))
+{
+	return ebt_do_table(hook, pskb, in, out, &frame_nat);
+}
+
+static unsigned int
+ebt_nat_src(unsigned int hook, struct sk_buff **pskb, const struct net_device *in
+   , const struct net_device *out, int (*okfn)(struct sk_buff *))
+{
+	return ebt_do_table(hook, pskb, in, out, &frame_nat);
+}
+
+static struct nf_hook_ops ebt_ops_nat[] = {
+	{
+		.hook		= ebt_nat_dst,
+		.owner		= THIS_MODULE,
+		.pf		= PF_BRIDGE,
+		.hooknum	= NF_BR_LOCAL_OUT,
+		.priority	= NF_BR_PRI_NAT_DST_OTHER,
+	},
+	{
+		.hook		= ebt_nat_src,
+		.owner		= THIS_MODULE,
+		.pf		= PF_BRIDGE,
+		.hooknum	= NF_BR_POST_ROUTING,
+		.priority	= NF_BR_PRI_NAT_SRC,
+	},
+	{
+		.hook		= ebt_nat_dst,
+		.owner		= THIS_MODULE,
+		.pf		= PF_BRIDGE,
+		.hooknum	= NF_BR_PRE_ROUTING,
+		.priority	= NF_BR_PRI_NAT_DST_BRIDGED,
+	},
+};
+
+static int __init ebtable_nat_init(void)
+{
+	int i, ret, j;
+
+	ret = ebt_register_table(&frame_nat);
+	if (ret < 0)
+		return ret;
+	for (i = 0; i < ARRAY_SIZE(ebt_ops_nat); i++)
+		if ((ret = nf_register_hook(&ebt_ops_nat[i])) < 0)
+			goto cleanup;
+	return ret;
+cleanup:
+	for (j = 0; j < i; j++)
+		nf_unregister_hook(&ebt_ops_nat[j]);
+	ebt_unregister_table(&frame_nat);
+	return ret;
+}
+
+static void __exit ebtable_nat_fini(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ebt_ops_nat); i++)
+		nf_unregister_hook(&ebt_ops_nat[i]);
+	ebt_unregister_table(&frame_nat);
+}
+
+module_init(ebtable_nat_init);
+module_exit(ebtable_nat_fini);
+MODULE_LICENSE("GPL");