[net-next-2.6.git] / net / bridge / br_fdb.c

/*
 *	Forwarding database
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.org>
 *
 *	$Id: br_fdb.c,v 1.6 2002/01/17 00:57:07 davem 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 <linux/random.h>
#include <asm/atomic.h>
#include <asm/unaligned.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 u32 fdb_salt __read_mostly;

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

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)
{
	/* 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);
}

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);
	}
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Forwarding database
	3	* Linux ethernet bridge
	4	*
	5	* Authors:
	6	* Lennert Buytenhek <buytenh@gnu.org>
	7	*
	8	* $Id: br_fdb.c,v 1.6 2002/01/17 00:57:07 davem Exp $
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/init.h>
	18	#include <linux/spinlock.h>
	19	#include <linux/times.h>
	20	#include <linux/netdevice.h>
	21	#include <linux/etherdevice.h>
	22	#include <linux/jhash.h>
3f890923	23	#include <linux/random.h>
1da177e4	24	#include <asm/atomic.h>
3f890923	25	#include <asm/unaligned.h>
1da177e4 LT	26	#include "br_private.h"
1da177e4 LT	27
e18b890b	28	static struct kmem_cache *br_fdb_cache __read_mostly;
1da177e4 LT	29	static int fdb_insert(struct net_bridge br, struct net_bridge_port source,
	30	const unsigned char *addr);
	31
3f890923 SH	32	static u32 fdb_salt __read_mostly;
3f890923 SH	33
1da177e4 LT	34	void __init br_fdb_init(void)
	35	{
	36	br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
	37	sizeof(struct net_bridge_fdb_entry),
	38	0,
	39	SLAB_HWCACHE_ALIGN, NULL, NULL);
3f890923	40	get_random_bytes(&fdb_salt, sizeof(fdb_salt));
1da177e4 LT	41	}
	42
	43	void __exit br_fdb_fini(void)
	44	{
	45	kmem_cache_destroy(br_fdb_cache);
	46	}
	47
	48
	49	/* if topology_changing then use forward_delay (default 15 sec)
	50	* otherwise keep longer (default 5 minutes)
	51	*/
3f890923	52	static inline unsigned long hold_time(const struct net_bridge *br)
1da177e4 LT	53	{
	54	return br->topology_change ? br->forward_delay : br->ageing_time;
	55	}
	56
3f890923	57	static inline int has_expired(const struct net_bridge *br,
1da177e4 LT	58	const struct net_bridge_fdb_entry *fdb)
1da177e4 LT	59	{
9d6f229f	60	return !fdb->is_static
1da177e4 LT	61	&& time_before_eq(fdb->ageing_timer + hold_time(br), jiffies);
	62	}
	63
3f890923	64	static inline int br_mac_hash(const unsigned char *mac)
1da177e4	65	{
3f890923 SH	66	/* use 1 byte of OUI cnd 3 bytes of NIC */
	67	u32 key = get_unaligned((u32 *)(mac + 2));
	68	return jhash_1word(key, fdb_salt) & (BR_HASH_SIZE - 1);
1da177e4 LT	69	}
1da177e4 LT	70
3f890923	71	static inline void fdb_delete(struct net_bridge_fdb_entry *f)
1da177e4 LT	72	{
	73	hlist_del_rcu(&f->hlist);
	74	br_fdb_put(f);
	75	}
	76
	77	void br_fdb_changeaddr(struct net_bridge_port p, const unsigned char newaddr)
	78	{
	79	struct net_bridge *br = p->br;
	80	int i;
9d6f229f	81
1da177e4 LT	82	spin_lock_bh(&br->hash_lock);
	83
	84	/* Search all chains since old address/hash is unknown */
	85	for (i = 0; i < BR_HASH_SIZE; i++) {
	86	struct hlist_node *h;
	87	hlist_for_each(h, &br->hash[i]) {
	88	struct net_bridge_fdb_entry *f;
	89
	90	f = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
	91	if (f->dst == p && f->is_local) {
	92	/* maybe another port has same hw addr? */
	93	struct net_bridge_port *op;
	94	list_for_each_entry(op, &br->port_list, list) {
9d6f229f	95	if (op != p &&
6ede2463 SH	96	!compare_ether_addr(op->dev->dev_addr,
6ede2463 SH	97	f->addr.addr)) {
1da177e4 LT	98	f->dst = op;
	99	goto insert;
	100	}
	101	}
	102
	103	/* delete old one */
	104	fdb_delete(f);
	105	goto insert;
	106	}
	107	}
	108	}
	109	insert:
	110	/* insert new address, may fail if invalid address or dup. */
	111	fdb_insert(br, p, newaddr);
	112
	113	spin_unlock_bh(&br->hash_lock);
	114	}
	115
	116	void br_fdb_cleanup(unsigned long _data)
	117	{
	118	struct net_bridge br = (struct net_bridge )_data;
	119	unsigned long delay = hold_time(br);
	120	int i;
	121
	122	spin_lock_bh(&br->hash_lock);
	123	for (i = 0; i < BR_HASH_SIZE; i++) {
	124	struct net_bridge_fdb_entry *f;
	125	struct hlist_node h, n;
	126
	127	hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
9d6f229f YH	128	if (!f->is_static &&
9d6f229f YH	129	time_before_eq(f->ageing_timer + delay, jiffies))
1da177e4 LT	130	fdb_delete(f);
	131	}
	132	}
	133	spin_unlock_bh(&br->hash_lock);
	134
	135	mod_timer(&br->gc_timer, jiffies + HZ/10);
	136	}
	137
1a620698 SH	138
	139	void br_fdb_delete_by_port(struct net_bridge *br,
	140	const struct net_bridge_port *p,
	141	int do_all)
1da177e4 LT	142	{
	143	int i;
	144
	145	spin_lock_bh(&br->hash_lock);
	146	for (i = 0; i < BR_HASH_SIZE; i++) {
	147	struct hlist_node h, g;
9d6f229f	148
1da177e4 LT	149	hlist_for_each_safe(h, g, &br->hash[i]) {
	150	struct net_bridge_fdb_entry *f
	151	= hlist_entry(h, struct net_bridge_fdb_entry, hlist);
9d6f229f	152	if (f->dst != p)
1da177e4 LT	153	continue;
1da177e4 LT	154
1a620698 SH	155	if (f->is_static && !do_all)
1a620698 SH	156	continue;
1da177e4 LT	157	/*
	158	* if multiple ports all have the same device address
	159	* then when one port is deleted, assign
	160	* the local entry to other port
	161	*/
	162	if (f->is_local) {
	163	struct net_bridge_port *op;
	164	list_for_each_entry(op, &br->port_list, list) {
9d6f229f	165	if (op != p &&
6ede2463 SH	166	!compare_ether_addr(op->dev->dev_addr,
6ede2463 SH	167	f->addr.addr)) {
1da177e4 LT	168	f->dst = op;
	169	goto skip_delete;
	170	}
	171	}
	172	}
	173
	174	fdb_delete(f);
	175	skip_delete: ;
	176	}
	177	}
	178	spin_unlock_bh(&br->hash_lock);
	179	}
	180
	181	/* No locking or refcounting, assumes caller has no preempt (rcu_read_lock) */
	182	struct net_bridge_fdb_entry __br_fdb_get(struct net_bridge br,
	183	const unsigned char *addr)
	184	{
	185	struct hlist_node *h;
	186	struct net_bridge_fdb_entry *fdb;
	187
	188	hlist_for_each_entry_rcu(fdb, h, &br->hash[br_mac_hash(addr)], hlist) {
6ede2463	189	if (!compare_ether_addr(fdb->addr.addr, addr)) {
1da177e4 LT	190	if (unlikely(has_expired(br, fdb)))
	191	break;
	192	return fdb;
	193	}
	194	}
	195
	196	return NULL;
	197	}
	198
	199	/* Interface used by ATM hook that keeps a ref count */
9d6f229f	200	struct net_bridge_fdb_entry br_fdb_get(struct net_bridge br,
1da177e4 LT	201	unsigned char *addr)
	202	{
	203	struct net_bridge_fdb_entry *fdb;
	204
	205	rcu_read_lock();
	206	fdb = __br_fdb_get(br, addr);
b19cbe2a PM	207	if (fdb && !atomic_inc_not_zero(&fdb->use_count))
b19cbe2a PM	208	fdb = NULL;
1da177e4 LT	209	rcu_read_unlock();
	210	return fdb;
	211	}
	212
	213	static void fdb_rcu_free(struct rcu_head *head)
	214	{
	215	struct net_bridge_fdb_entry *ent
	216	= container_of(head, struct net_bridge_fdb_entry, rcu);
	217	kmem_cache_free(br_fdb_cache, ent);
	218	}
	219
	220	/* Set entry up for deletion with RCU */
	221	void br_fdb_put(struct net_bridge_fdb_entry *ent)
	222	{
	223	if (atomic_dec_and_test(&ent->use_count))
	224	call_rcu(&ent->rcu, fdb_rcu_free);
	225	}
	226
	227	/*
9d6f229f	228	* Fill buffer with forwarding table records in
1da177e4 LT	229	* the API format.
	230	*/
	231	int br_fdb_fillbuf(struct net_bridge br, void buf,
	232	unsigned long maxnum, unsigned long skip)
	233	{
	234	struct __fdb_entry *fe = buf;
	235	int i, num = 0;
	236	struct hlist_node *h;
	237	struct net_bridge_fdb_entry *f;
	238
	239	memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
	240
	241	rcu_read_lock();
	242	for (i = 0; i < BR_HASH_SIZE; i++) {
	243	hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
	244	if (num >= maxnum)
	245	goto out;
	246
9d6f229f	247	if (has_expired(br, f))
1da177e4 LT	248	continue;
	249
	250	if (skip) {
	251	--skip;
	252	continue;
	253	}
	254
	255	/* convert from internal format to API */
	256	memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
	257	fe->port_no = f->dst->port_no;
	258	fe->is_local = f->is_local;
	259	if (!f->is_static)
	260	fe->ageing_timer_value = jiffies_to_clock_t(jiffies - f->ageing_timer);
	261	++fe;
	262	++num;
	263	}
	264	}
	265
	266	out:
	267	rcu_read_unlock();
	268
	269	return num;
	270	}
	271
	272	static inline struct net_bridge_fdb_entry fdb_find(struct hlist_head head,
	273	const unsigned char *addr)
	274	{
	275	struct hlist_node *h;
	276	struct net_bridge_fdb_entry *fdb;
	277
	278	hlist_for_each_entry_rcu(fdb, h, head, hlist) {
6ede2463	279	if (!compare_ether_addr(fdb->addr.addr, addr))
1da177e4 LT	280	return fdb;
	281	}
	282	return NULL;
	283	}
	284
	285	static struct net_bridge_fdb_entry fdb_create(struct hlist_head head,
	286	struct net_bridge_port *source,
9d6f229f	287	const unsigned char *addr,
1da177e4 LT	288	int is_local)
	289	{
	290	struct net_bridge_fdb_entry *fdb;
	291
	292	fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
	293	if (fdb) {
	294	memcpy(fdb->addr.addr, addr, ETH_ALEN);
	295	atomic_set(&fdb->use_count, 1);
	296	hlist_add_head_rcu(&fdb->hlist, head);
	297
	298	fdb->dst = source;
	299	fdb->is_local = is_local;
	300	fdb->is_static = is_local;
	301	fdb->ageing_timer = jiffies;
	302	}
	303	return fdb;
	304	}
	305
	306	static int fdb_insert(struct net_bridge br, struct net_bridge_port source,
	307	const unsigned char *addr)
	308	{
	309	struct hlist_head *head = &br->hash[br_mac_hash(addr)];
	310	struct net_bridge_fdb_entry *fdb;
	311
	312	if (!is_valid_ether_addr(addr))
	313	return -EINVAL;
	314
	315	fdb = fdb_find(head, addr);
	316	if (fdb) {
9d6f229f	317	/* it is okay to have multiple ports with same
1da177e4 LT	318	* address, just use the first one.
1da177e4 LT	319	*/
9d6f229f	320	if (fdb->is_local)
1da177e4 LT	321	return 0;
	322
	323	printk(KERN_WARNING "%s adding interface with same address "
	324	"as a received packet\n",
	325	source->dev->name);
	326	fdb_delete(fdb);
9d6f229f	327	}
1da177e4 LT	328
	329	if (!fdb_create(head, source, addr, 1))
	330	return -ENOMEM;
	331
	332	return 0;
	333	}
	334
	335	int br_fdb_insert(struct net_bridge br, struct net_bridge_port source,
	336	const unsigned char *addr)
	337	{
	338	int ret;
	339
	340	spin_lock_bh(&br->hash_lock);
	341	ret = fdb_insert(br, source, addr);
	342	spin_unlock_bh(&br->hash_lock);
	343	return ret;
	344	}
	345
	346	void br_fdb_update(struct net_bridge br, struct net_bridge_port source,
	347	const unsigned char *addr)
	348	{
	349	struct hlist_head *head = &br->hash[br_mac_hash(addr)];
	350	struct net_bridge_fdb_entry *fdb;
	351
	352	/* some users want to always flood. */
	353	if (hold_time(br) == 0)
	354	return;
	355
1da177e4 LT	356	fdb = fdb_find(head, addr);
	357	if (likely(fdb)) {
	358	/* attempt to update an entry for a local interface */
	359	if (unlikely(fdb->is_local)) {
9d6f229f	360	if (net_ratelimit())
1da177e4 LT	361	printk(KERN_WARNING "%s: received packet with "
	362	" own address as source address\n",
	363	source->dev->name);
	364	} else {
	365	/* fastpath: update of existing entry */
	366	fdb->dst = source;
	367	fdb->ageing_timer = jiffies;
	368	}
	369	} else {
f8ae737d	370	spin_lock(&br->hash_lock);
1da177e4 LT	371	if (!fdb_find(head, addr))
	372	fdb_create(head, source, addr, 0);
	373	/* else we lose race and someone else inserts
	374	* it first, don't bother updating
	375	*/
f8ae737d	376	spin_unlock(&br->hash_lock);
1da177e4	377	}
1da177e4	378	}