ap/os/linux/linux-3.4.x/net/bridge/br_fdb.c

/*
 *	Forwarding database
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.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/init.h>
#include <linux/rculist.h>
#include <linux/spinlock.h>
#include <linux/times.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/jhash.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/atomic.h>
#include <linux/export.h>
#include <asm/unaligned.h>
#include <net/SI/fast_common.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);
static void fdb_notify(struct net_bridge *br,
		       const struct net_bridge_fdb_entry *, int);

static u32 fdb_salt __read_mostly;


int __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);
	if (!br_fdb_cache)
		return -ENOMEM;

	get_random_bytes(&fdb_salt, sizeof(fdb_salt));
	return 0;
}

void 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->updated + hold_time(br), jiffies);
}

static inline int br_mac_hash(const unsigned char *mac)
{
	/* use 1 byte of OUI cnd 3 bytes of NIC */
	u32 key = get_unaligned((u32 *)(mac + 2));
	return jhash_1word(key, fdb_salt) & (BR_HASH_SIZE - 1);
}
int netdog_mac_hash(const unsigned char *mac)
{
	return br_mac_hash(mac);
}
static void fdb_rcu_free(struct rcu_head *head)
{
	struct net_bridge_fdb_entry *ent
		= container_of(head, struct net_bridge_fdb_entry, rcu);
    netslab_dec(BRFDB_SLAB);
	kmem_cache_free(br_fdb_cache, ent);
}

static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
{
	hlist_del_rcu(&f->hlist);
	fdb_notify(br, f, RTM_DELNEIGH);
	call_rcu(&f->rcu, fdb_rcu_free);
}

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(br, 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_change_mac_address(struct net_bridge *br, const u8 *newaddr)
{
	struct net_bridge_fdb_entry *f;

	/* If old entry was unassociated with any port, then delete it. */
	f = __br_fdb_get(br, br->dev->dev_addr);
	if (f && f->is_local && !f->dst)
		fdb_delete(br, f);

	fdb_insert(br, NULL, newaddr);
}

void br_fdb_cleanup(unsigned long _data)
{
	struct net_bridge *br = (struct net_bridge *)_data;
	unsigned long delay = hold_time(br);
	unsigned long next_timer = jiffies + br->ageing_time;
	int i;

	spin_lock(&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) {
			unsigned long this_timer;
			if (f->is_static)
				continue;
			this_timer = f->updated + delay;
			if (time_before_eq(this_timer, jiffies))
				fdb_delete(br, f);
			else if (time_before(this_timer, next_timer))
				next_timer = this_timer;
		}
	}
	spin_unlock(&br->hash_lock);

	mod_timer(&br->gc_timer, round_jiffies_up(next_timer));
}

/* Completely flush all dynamic entries in forwarding database.*/
void br_fdb_flush(struct net_bridge *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)
				fdb_delete(br, f);
		}
	}
	spin_unlock_bh(&br->hash_lock);
}

/* Flush all entries referring to a specific port.
 * if do_all is set also flush static entries
 */
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(br, f);
		skip_delete: ;
		}
	}
	spin_unlock_bh(&br->hash_lock);
}

/* No locking or refcounting, assumes caller has 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;
}

#if IS_ENABLED(CONFIG_ATM_LANE)
/* Interface used by ATM LANE hook to test
 * if an addr is on some other bridge port */
int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
{
	struct net_bridge_fdb_entry *fdb;
	struct net_bridge_port *port;
	int ret;

	rcu_read_lock();
	port = br_port_get_rcu(dev);
	if (!port)
		ret = 0;
	else {
		fdb = __br_fdb_get(port->br, addr);
		ret = fdb && fdb->dst && fdb->dst->dev != dev &&
			fdb->dst->state == BR_STATE_FORWARDING;
	}
	rcu_read_unlock();

	return ret;
}
#endif /* CONFIG_ATM_LANE */

/*
 * 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;

			/* ignore pseudo entry for local MAC address */
			if (!f->dst)
				continue;

			if (skip) {
				--skip;
				continue;
			}

			/* convert from internal format to API */
			memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);

			/* due to ABI compat need to split into hi/lo */
			fe->port_no = f->dst->port_no;
			fe->port_hi = f->dst->port_no >> 8;

			fe->is_local = f->is_local;
			if (!f->is_static)
				fe->ageing_timer_value = jiffies_to_clock_t(jiffies - f->updated);
			++fe;
			++num;
		}
	}

 out:
	rcu_read_unlock();

	return num;
}

static 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(fdb, h, head, hlist) {
		if (!compare_ether_addr(fdb->addr.addr, addr))
			return fdb;
	}
	return NULL;
}

static struct net_bridge_fdb_entry *fdb_find_rcu(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)
{
	struct net_bridge_fdb_entry *fdb;
	fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
	if (fdb) {
		netslab_inc(BRFDB_SLAB);
		netruninfo_add(NULL, BRFDB_ALLOC);
		memcpy(fdb->addr.addr, addr, ETH_ALEN);
		fdb->dst = source;
		fdb->is_local = 0;
		fdb->is_static = 0;
		fdb->updated = fdb->used = jiffies;
		hlist_add_head_rcu(&fdb->hlist, head);
		net_run_track(PRT_BR,"create");
	}
	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;
		br_warn(br, "adding interface %s with same address "
		       "as a received packet\n",
		       source->dev->name);
		fdb_delete(br, fdb);
	}

	fdb = fdb_create(head, source, addr);
	if (!fdb)
		return -ENOMEM;

	fdb->is_local = fdb->is_static = 1;
	fdb_notify(br, fdb, RTM_NEWNEIGH);
	return 0;
}

/* Add entry for local address of interface */
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;
}


//add by zhudeming Ìí¼ÓÒì³£ÁÚ¾ÓÁбí¸üУ¬µ±´æÔÚÁ½¸öÒì³£macµØַʱ£¬
//Ìṩ¶ÔÆäÖÐÒ»¸öµØÖ·µÄ¼æÈÝÅжÏ
int  brmoniter_flag = 0;
int  usbhaved = 0;
unsigned char ignoremac[ETH_ALEN] = {0};
unsigned char usbmac[ETH_ALEN] = {0};

void br_fdb_moniter(struct net_bridge_port *source, const unsigned char *addr)
{
	if(brmoniter_flag)
	{
		if(usbhaved == 0)
		{
			usbhaved == 1;
			memcpy(usbmac, addr, ETH_ALEN);
		}
		else if(source->dev&& strncmp(source->dev->name,"usb",3)==0)	
		{
			if ( (strncmp(addr, usbmac, ETH_ALEN) != 0) && (strncmp(addr, ignoremac, ETH_ALEN) != 0) )
			{
				panic("set wrong neigh table for usb!!!");
			}
		}
	}
}


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;

	/* ignore packets unless we are using this port */
	if (!(source->state == BR_STATE_LEARNING ||
	      source->state == BR_STATE_FORWARDING))
		return;

	fdb = fdb_find_rcu(head, addr);
	if (likely(fdb)) {
		/* attempt to update an entry for a local interface */
		if(fdb->dst && fdb->dst->dev && source->dev && fdb->dst->dev->ifindex != source->dev->ifindex){
			netruninfo_add(NULL,SSMAC_CHANGE_INDEV);
		}
		if (unlikely(fdb->is_local)) {
			if (net_ratelimit())
				br_warn(br, "received packet on %s with "
					"own address as source address\n",
					source->dev->name);
		} else {
			/* fastpath: update of existing entry */
			/*add by jiangjing*/
			if(fdb->dst!=NULL && fdb->dst != source)
			{
				netruninfo_add(NULL, BR_NEIGH_VARY);
				//panic("br_fdb_update err: %s received data ,source mac addr is %s addr,should is %s mac addr!\n", 
				//source->dev->name,fdb->dst->dev->name,source->dev->name);
		      }
			fdb->dst = source;
			fdb->updated = jiffies;
		}
	} else {
		spin_lock_bh(&br->hash_lock);
		if (likely(!fdb_find(head, addr))) {

			//add by zhudeming 
			br_fdb_moniter(source, addr);
			
			fdb = fdb_create(head, source, addr);
			if (fdb)
				fdb_notify(br, fdb, RTM_NEWNEIGH);
		}
		/* else  we lose race and someone else inserts
		 * it first, don't bother updating
		 */
		spin_unlock_bh(&br->hash_lock);
	}
}

static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb)
{
	if (fdb->is_local)
		return NUD_PERMANENT;
	else if (fdb->is_static)
		return NUD_NOARP;
	else if (has_expired(fdb->dst->br, fdb))
		return NUD_STALE;
	else
		return NUD_REACHABLE;
}

static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
			 const struct net_bridge_fdb_entry *fdb,
			 u32 pid, u32 seq, int type, unsigned int flags)
{
	unsigned long now = jiffies;
	struct nda_cacheinfo ci;
	struct nlmsghdr *nlh;
	struct ndmsg *ndm;

	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags);
	if (nlh == NULL)
		return -EMSGSIZE;

	ndm = nlmsg_data(nlh);
	ndm->ndm_family	 = AF_BRIDGE;
	ndm->ndm_pad1    = 0;
	ndm->ndm_pad2    = 0;
	ndm->ndm_flags	 = 0;
	ndm->ndm_type	 = 0;
	ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
	ndm->ndm_state   = fdb_to_nud(fdb);

	NLA_PUT(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr);

	ci.ndm_used	 = jiffies_to_clock_t(now - fdb->used);
	ci.ndm_confirmed = 0;
	ci.ndm_updated	 = jiffies_to_clock_t(now - fdb->updated);
	ci.ndm_refcnt	 = 0;
	NLA_PUT(skb, NDA_CACHEINFO, sizeof(ci), &ci);

	return nlmsg_end(skb, nlh);

nla_put_failure:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

static inline size_t fdb_nlmsg_size(void)
{
	return NLMSG_ALIGN(sizeof(struct ndmsg))
		+ nla_total_size(ETH_ALEN) /* NDA_LLADDR */
		+ nla_total_size(sizeof(struct nda_cacheinfo));
}

static void fdb_notify(struct net_bridge *br,
		       const struct net_bridge_fdb_entry *fdb, int type)
{
	struct net *net = dev_net(br->dev);
	struct sk_buff *skb;
	int err = -ENOBUFS;

	skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
	if (skb == NULL)
		goto errout;

	err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
	if (err < 0) {
		/* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
	//print_sun(SUN_LEARN,"dev:%s,fdb_notify::rtnl_notify;type=%d,for example RTM_NEWNEIGH",br->dev->name,type);
	rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
	return;
errout:
	if (err < 0)
		rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
}

/* Dump information about entries, in response to GETNEIGH */
int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct net *net = sock_net(skb->sk);
	struct net_device *dev;
	int idx = 0;

	rcu_read_lock();
	for_each_netdev_rcu(net, dev) {
		struct net_bridge *br = netdev_priv(dev);
		int i;

		if (!(dev->priv_flags & IFF_EBRIDGE))
			continue;

		for (i = 0; i < BR_HASH_SIZE; i++) {
			struct hlist_node *h;
			struct net_bridge_fdb_entry *f;

			hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
				if (idx < cb->args[0])
					goto skip;

				if (fdb_fill_info(skb, br, f,
						  NETLINK_CB(cb->skb).pid,
						  cb->nlh->nlmsg_seq,
						  RTM_NEWNEIGH,
						  NLM_F_MULTI) < 0)
					break;
skip:
				++idx;
			}
		}
	}
	rcu_read_unlock();

	cb->args[0] = idx;

	return skb->len;
}

/* Update (create or replace) forwarding database entry */
static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
			 __u16 state, __u16 flags)
{
	struct net_bridge *br = source->br;
	struct hlist_head *head = &br->hash[br_mac_hash(addr)];
	struct net_bridge_fdb_entry *fdb;

	fdb = fdb_find(head, addr);
	if (fdb == NULL) {
		if (!(flags & NLM_F_CREATE))
			return -ENOENT;

		fdb = fdb_create(head, source, addr);
		if (!fdb)
			return -ENOMEM;
		fdb_notify(br, fdb, RTM_NEWNEIGH);
	} else {
		if (flags & NLM_F_EXCL)
			return -EEXIST;
	}

	if (fdb_to_nud(fdb) != state) {
		if (state & NUD_PERMANENT)
			fdb->is_local = fdb->is_static = 1;
		else if (state & NUD_NOARP) {
			fdb->is_local = 0;
			fdb->is_static = 1;
		} else
			fdb->is_local = fdb->is_static = 0;

		fdb->updated = fdb->used = jiffies;
		fdb_notify(br, fdb, RTM_NEWNEIGH);
	}

	return 0;
}

/* Add new permanent fdb entry with RTM_NEWNEIGH */
int br_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
	struct net *net = sock_net(skb->sk);
	struct ndmsg *ndm;
	struct nlattr *tb[NDA_MAX+1];
	struct net_device *dev;
	struct net_bridge_port *p;
	const __u8 *addr;
	int err;

	ASSERT_RTNL();
	err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
	if (err < 0)
		return err;

	ndm = nlmsg_data(nlh);
	if (ndm->ndm_ifindex == 0) {
		pr_info("bridge: RTM_NEWNEIGH with invalid ifindex\n");
		return -EINVAL;
	}

	dev = __dev_get_by_index(net, ndm->ndm_ifindex);
	if (dev == NULL) {
		pr_info("bridge: RTM_NEWNEIGH with unknown ifindex\n");
		return -ENODEV;
	}

	if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
		pr_info("bridge: RTM_NEWNEIGH with invalid address\n");
		return -EINVAL;
	}

	addr = nla_data(tb[NDA_LLADDR]);
	if (!is_valid_ether_addr(addr)) {
		pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
		return -EINVAL;
	}

	if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
		pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
		return -EINVAL;
	}

	p = br_port_get_rtnl(dev);
	if (p == NULL) {
		pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
			dev->name);
		return -EINVAL;
	}

	if (ndm->ndm_flags & NTF_USE) {
		local_bh_disable();
		rcu_read_lock();
		br_fdb_update(p->br, p, addr);
		rcu_read_unlock();
		local_bh_enable();
	} else {
		spin_lock_bh(&p->br->hash_lock);
		err = fdb_add_entry(p, addr, ndm->ndm_state, nlh->nlmsg_flags);
		spin_unlock_bh(&p->br->hash_lock);
	}

	return err;
}

static int fdb_delete_by_addr(struct net_bridge_port *p, const u8 *addr)
{
	struct net_bridge *br = p->br;
	struct hlist_head *head = &br->hash[br_mac_hash(addr)];
	struct net_bridge_fdb_entry *fdb;

	fdb = fdb_find(head, addr);
	if (!fdb)
		return -ENOENT;

	fdb_delete(p->br, fdb);
	return 0;
}

/* Remove neighbor entry with RTM_DELNEIGH */
int br_fdb_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
	struct net *net = sock_net(skb->sk);
	struct ndmsg *ndm;
	struct net_bridge_port *p;
	struct nlattr *llattr;
	const __u8 *addr;
	struct net_device *dev;
	int err;

	ASSERT_RTNL();
	if (nlmsg_len(nlh) < sizeof(*ndm))
		return -EINVAL;

	ndm = nlmsg_data(nlh);
	if (ndm->ndm_ifindex == 0) {
		pr_info("bridge: RTM_DELNEIGH with invalid ifindex\n");
		return -EINVAL;
	}

	dev = __dev_get_by_index(net, ndm->ndm_ifindex);
	if (dev == NULL) {
		pr_info("bridge: RTM_DELNEIGH with unknown ifindex\n");
		return -ENODEV;
	}

	llattr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_LLADDR);
	if (llattr == NULL || nla_len(llattr) != ETH_ALEN) {
		pr_info("bridge: RTM_DELNEIGH with invalid address\n");
		return -EINVAL;
	}

	addr = nla_data(llattr);

	p = br_port_get_rtnl(dev);
	if (p == NULL) {
		pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
			dev->name);
		return -EINVAL;
	}

	spin_lock_bh(&p->br->hash_lock);
	err = fdb_delete_by_addr(p, addr);
	spin_unlock_bh(&p->br->hash_lock);

	return err;
}


extern void tcpdumpin_sq(struct sk_buff *skb);

//²Î¿¼br_dev_xmit£¬ÊµÏÖ¿ìËÙת·¢£¬Î´¹Ø×¢fdbÖеÄÁÙʱ״̬,ÁíÍ⣬ÐèҪȷ±£skb->mac_header±»ÓÐЧ¸³Öµ£¬·ñÔòÎÞ·¨»ñÈ¡µ½MACµØÖ·
//ĿǰδʹÓÃÇý¶¯µ½Çý¶¯µÄ×îÓÅת·¢£¬Ó¦¸ÃûÓÐÎÊÌ⣬ºóÐøÒ»µ©Ê¹Óã¬ÐèÒªÔÚtry_fastnat_for_macdataÀà½Ó¿ÚÖÐÌí¼Óskb_reset_mac_headerÀ´½â¾ö
int fast_br(struct sk_buff *skb)
{
	const unsigned char *dest = NULL;
	struct hlist_head *head;
	struct net_bridge_fdb_entry *fdb;
	struct net_bridge_port *p;
	struct net_bridge *br;

	if(!skb->dev)
	{
		//print_sun(SUN_DBG, "fast_br  skb->dev err skb->dev = %x\n", skb->dev);
		return 0;
	}
    
	if(skb->mac_header == 0 || skb->mac_header == ~0U)
	{
		//panic("driver  not  set  macheader !!!\n"); for xlat
		return 0;
	}
    
	dest = eth_hdr(skb)->h_dest;

	//²ÎÕÕbr_del_if½Ó¿Ú£¬È·±£Èë¿ÚdevÊÇÇŵ㣬ÒÔ·ÀÖ¹wan1µÈÍâÍø¿Úµ±Çŵã½øÐд¦Àí
	p = br_port_get_rtnl(skb->dev);
	if (p == NULL || p->br == NULL) 		
	{
		//print_sun(SUN_DBG, "fast_br  br_port_get_rtnl err p = %x\n", p);
		return 0;
	}

	br = p->br;
	//еÄlinuxÄÚºËÖУ¬ÐèÒª½øÐÐif (br->vlan_enabled)  return 0;ÒÔ½â¾övlan×÷ΪÇŵãÎÊÌ⣬»òÕ߶ÏÑÔÒ²¿É
	head = &br->hash[br_mac_hash(dest)];
	
	if((fdb = fdb_find_rcu(head, dest)) != NULL)
	{
		//ÈôÄ¿µÄMACµØַΪԶ¶Ë£¬·½¿ÉÖ´ÐÐfastbr
		if((!fdb->is_local) && fdb->dst && fdb->dst->dev && 
			(((fdb->dst->flags & BR_HAIRPIN_MODE) || skb->dev != fdb->dst->dev) &&fdb->dst->state == BR_STATE_FORWARDING)) 
		{
	//		tcpdumpin_sq(skb);
            fast_tcpdump(skb);
			skb->dev = fdb->dst->dev;
			skb->isFastbr = 1;
			fdb->updated = jiffies;
            skb->now_location |= FASTBR_SUCC;
			skb_rest_data_byproto(skb);
			//´Ë´¦Ó¦¸Ã¿ÉÒÔÖ±½Óµ÷ÓÃdev_queue_xmit½Ó¿Ú£¬ºóÐø¸ð±ò¿É¹Ø×¢ÏÂ
			br_dev_queue_push_xmit(skb);
			return 1;
		}

        //»Ø»·µÄÊý¾ÝÖ±½Ó¶ªÆú
        if((!fdb->is_local) && fdb->dst && fdb->dst->dev && 
            (skb->dev == fdb->dst->dev) && fdb->dst->state == BR_STATE_FORWARDING)
        {
            skbinfo_add(NULL,SKB_LOOP);
            //print_sun(SUN_ERR,"fast_br loop data discarded, dev:%s \n", skb->dev->name);
            kfree_skb(skb);
            return 1;
        }
	}
	//print_sun(SUN_DBG, "fast_br  fdb_find_rcu err fdb = %x \n",fdb);
	return 0;
}
EXPORT_SYMBOL(fast_br);


//ÒÔÄ¿µÄMAC×÷ΪƥÅäÌõ¼þ£¬µ±Èë²ÎdevΪbr0ʱ£¬·µ»ØֵΪ¶þ²ãÇŵ㣬·ñÔòÈÔȻΪÈë²Îdev£¬ÕâÑù¿ÉÒÔ´ïµ½ÈÝ´íÄÜÁ¦£»È¡´úfastL2DBFind
struct net_device *getbrport_bydst(struct net_device *dev,unsigned char *dest)
{
	struct hlist_head *head;
	struct net_bridge_fdb_entry *fdb;
	struct net_bridge_port *p;
	struct net_bridge *br;

	//±ØÐëÊÇbr0É豸
	if (dev == NULL || !(dev->priv_flags & IFF_EBRIDGE))
		return dev;

	br = netdev_priv(dev);
	//еÄlinuxÄÚºËÖУ¬ÐèÒª½øÐÐif (br->vlan_enabled)  return dev;ÒÔ½â¾övlan×÷ΪÇŵãÎÊÌ⣬»òÕ߶ÏÑÔÒ²¿É
	head = &br->hash[br_mac_hash(dest)];
	
	if((fdb = fdb_find_rcu(head, dest)) != NULL)
	{
		//ÈôÄ¿µÄMACµØַΪԶ¶Ë£¬·½¿ÉÖ´ÐÐfastbr
		if((!fdb->is_local) && fdb->dst && fdb->dst->dev && 
			(fdb->dst->state == BR_STATE_FORWARDING)) //(fdb->dst->flags & BR_HAIRPIN_MODE)
		{
			return fdb->dst->dev;
		}
	}
	return dev;
}
extern void fast_tcpdump(struct sk_buff *skb);
extern struct neigh_table arp_tbl;
extern char default_route_name[IFNAMSIZ];
char default_br_name[IFNAMSIZ] = {0};
int fast_fwd_ip4addr_conflict(struct sk_buff *skb)
{
	struct iphdr *iph = ip_hdr(skb);
	__be32 saddr,daddr,wan_ip,br_ip=0,br_bcast=0;
	struct net_device* in_dev = NULL;
	struct net_device* out_dev = NULL;
	struct ethhdr *eth;
	struct net_bridge_port *p;
	struct net_bridge *br = NULL;
	struct net_device *default_route_dev;
	struct net_device *default_br_dev;
	struct in_device *ip_ptr;

	if(iph->version != 4 || skb->indev == NULL)
	{
		return 0;
	}
	default_route_dev = dev_get_by_name(&init_net, default_route_name);
	if(default_route_dev == NULL)
	{
		return 0;
	}
	ip_ptr = __in_dev_get_rtnl(default_route_dev);
	if(ip_ptr && ip_ptr->ifa_list)
	{
		wan_ip = ip_ptr->ifa_list->ifa_local;
	}
	else
	{
		default_br_name[0] = 0;
		dev_put(default_route_dev);
		return 0;
	}
	in_dev = skb->indev;
	saddr = iph->saddr;
	daddr = iph->daddr;
	p = br_port_get_rtnl(in_dev);
	if (p != NULL) 		
	{
		br = p->br;
		if (br && br->dev && strncmp(br->dev->name, default_br_name, IFNAMSIZ-1))
		{
			strncpy(default_br_name, br->dev->name, IFNAMSIZ-1);
		}
	}
	default_br_dev = dev_get_by_name(&init_net, default_br_name);
	if(default_br_dev)
	{
		ip_ptr = __in_dev_get_rtnl(default_br_dev);
		if(ip_ptr && ip_ptr->ifa_list)
		{
			br_ip = ip_ptr->ifa_list->ifa_local;
			br_bcast = ip_ptr->ifa_list->ifa_broadcast;
		}
	}
	else
	{
		dev_put(default_route_dev);
		return 0;
	}
	if(br && ((daddr == br_ip) || (daddr == br_bcast) || (daddr == wan_ip)))
	{
		//printk("@!@1saddr=%08x,daddr=%08x,br_ip=%08x,br_bcast=%08x,wan_ip=%08x\n",saddr, daddr,  br_ip, br_bcast, wan_ip);
		if (IPPROTO_UDP == iph->protocol)
		{
			struct udphdr *udph = (struct udphdr *)(skb->data + iph->ihl * 4);
			if(udph->source == 0x4300 || udph->source == 0x4400
				|| udph->dest == 0x4300 || udph->dest == 0x4400)
			{
				//printk("@!@dhcp packet\n");
				dev_put(default_route_dev);
				dev_put(default_br_dev);
				return 0;
			}
		}
		out_dev = default_route_dev;
		skb_push(skb, ETH_HLEN);
		eth = (struct ethhdr*)(skb->data);
		memcpy(eth->h_source, in_dev->dev_addr, ETH_ALEN);
		memcpy(eth->h_dest, out_dev->dev_addr, ETH_ALEN);
		fast_tcpdump(skb);
		skb->dev = out_dev;
	}
	else if(in_dev == default_route_dev && ((saddr == br_ip) || (saddr == br_bcast) || (saddr == wan_ip)))
	{
		struct neighbour *neigh  = neigh_lookup(&arp_tbl, &daddr, default_br_dev);
		//printk("@!@2saddr=%08x,daddr=%08x,neigh=%08x,wan_ip=%08x\n",saddr, daddr, neigh, wan_ip);
		if(neigh)
		{
			//printk("@!@neigh=%s\n",neigh->dev->name);
			out_dev = getbrport_bydst(default_br_dev,neigh->ha);
			if(out_dev)
			{
				//printk("@!@out_dev=%s\n",out_dev->name);
				skb_push(skb, ETH_HLEN);
				eth = (struct ethhdr*)(skb->data);
				memcpy(eth->h_source, out_dev->dev_addr, ETH_ALEN);
				memcpy(eth->h_dest, neigh->ha, ETH_ALEN);
				//printk("@!@mac=%02x %02x %02x %02x %02x %02x\n",eth->h_dest[0],eth->h_dest[1],eth->h_dest[2],eth->h_dest[3],eth->h_dest[4],eth->h_dest[5]);
			}
			neigh_release(neigh);
		}
		if(out_dev == NULL)
		{
			printk("@!@dev: br port not found\n");
			dev_put(default_route_dev);
			dev_put(default_br_dev);
			return 0;
		}
		fast_tcpdump(skb);
		skb->dev = out_dev;
	}
	else
	{
		dev_put(default_route_dev);
		dev_put(default_br_dev);
		return 0;
	}
		
	eth->h_proto = htons(ETH_P_IP);
	skb->now_location |= FASTNAT_SUCC;
	dev_queue_xmit(skb);
	
	dev_put(default_route_dev);
	dev_put(default_br_dev);
	return 1;
}

int fast_for_multicast(struct sk_buff *skb)
{
	if (skb->indev && !strncmp(skb->indev->name, default_route_name, IFNAMSIZ-1))
	{
		struct net_device* dev = NULL;
		struct net_bridge *br;
		struct net_bridge_port *p;
		
		dev = dev_get_by_name(&init_net, default_br_name);
		if (dev == NULL || !(dev->priv_flags & IFF_EBRIDGE))
		{
			printk("@!@dev: br not found\n");
			if(dev != NULL)
			{
				dev_put(dev);				
			}
			return 0;
		}
		br = (struct net_bridge *)netdev_priv(dev);
		p = br_get_port(br, 1);
		if(p && p->dev)
		{
			struct ethhdr *eth;
			struct iphdr *iph = ip_hdr(skb);
			
			skb_push(skb, ETH_HLEN);
			eth = (struct ethhdr *)skb->data;
			memcpy(eth->h_source, p->dev->dev_addr, ETH_ALEN); 
			ip_eth_mc_map(iph->daddr, eth->h_dest);
			eth->h_proto = htons(ETH_P_IP);
			skb->dev = p->dev;
			skb->now_location |= FASTNAT_SUCC;
			dev_queue_xmit(skb);
			dev_put(dev);
			return 1;
		}
		dev_put(dev);
	}
	return 0;
}