[linux-2.6-block.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;

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, NULL);
	if (!br_fdb_cache)
		return -ENOMEM;

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

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);
}

/* 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(f);
		}
	}
	spin_unlock_bh(&br->hash_lock);
}

/* Flush all entries refering 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(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
87a596e0	34	int __init br_fdb_init(void)
1da177e4 LT	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);
87a596e0 AM	40	if (!br_fdb_cache)
	41	return -ENOMEM;
	42
3f890923	43	get_random_bytes(&fdb_salt, sizeof(fdb_salt));
87a596e0	44	return 0;
1da177e4 LT	45	}
	46
	47	void __exit br_fdb_fini(void)
	48	{
	49	kmem_cache_destroy(br_fdb_cache);
	50	}
	51
	52
	53	/* if topology_changing then use forward_delay (default 15 sec)
	54	* otherwise keep longer (default 5 minutes)
	55	*/
3f890923	56	static inline unsigned long hold_time(const struct net_bridge *br)
1da177e4 LT	57	{
	58	return br->topology_change ? br->forward_delay : br->ageing_time;
	59	}
	60
3f890923	61	static inline int has_expired(const struct net_bridge *br,
1da177e4 LT	62	const struct net_bridge_fdb_entry *fdb)
1da177e4 LT	63	{
9d6f229f	64	return !fdb->is_static
1da177e4 LT	65	&& time_before_eq(fdb->ageing_timer + hold_time(br), jiffies);
	66	}
	67
3f890923	68	static inline int br_mac_hash(const unsigned char *mac)
1da177e4	69	{
3f890923 SH	70	/* use 1 byte of OUI cnd 3 bytes of NIC */
	71	u32 key = get_unaligned((u32 *)(mac + 2));
	72	return jhash_1word(key, fdb_salt) & (BR_HASH_SIZE - 1);
1da177e4 LT	73	}
1da177e4 LT	74
3f890923	75	static inline void fdb_delete(struct net_bridge_fdb_entry *f)
1da177e4 LT	76	{
	77	hlist_del_rcu(&f->hlist);
	78	br_fdb_put(f);
	79	}
	80
	81	void br_fdb_changeaddr(struct net_bridge_port p, const unsigned char newaddr)
	82	{
	83	struct net_bridge *br = p->br;
	84	int i;
9d6f229f	85
1da177e4 LT	86	spin_lock_bh(&br->hash_lock);
	87
	88	/* Search all chains since old address/hash is unknown */
	89	for (i = 0; i < BR_HASH_SIZE; i++) {
	90	struct hlist_node *h;
	91	hlist_for_each(h, &br->hash[i]) {
	92	struct net_bridge_fdb_entry *f;
	93
	94	f = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
	95	if (f->dst == p && f->is_local) {
	96	/* maybe another port has same hw addr? */
	97	struct net_bridge_port *op;
	98	list_for_each_entry(op, &br->port_list, list) {
9d6f229f	99	if (op != p &&
6ede2463 SH	100	!compare_ether_addr(op->dev->dev_addr,
6ede2463 SH	101	f->addr.addr)) {
1da177e4 LT	102	f->dst = op;
	103	goto insert;
	104	}
	105	}
	106
	107	/* delete old one */
	108	fdb_delete(f);
	109	goto insert;
	110	}
	111	}
	112	}
	113	insert:
	114	/* insert new address, may fail if invalid address or dup. */
	115	fdb_insert(br, p, newaddr);
	116
	117	spin_unlock_bh(&br->hash_lock);
	118	}
	119
	120	void br_fdb_cleanup(unsigned long _data)
	121	{
	122	struct net_bridge br = (struct net_bridge )_data;
	123	unsigned long delay = hold_time(br);
	124	int i;
	125
	126	spin_lock_bh(&br->hash_lock);
	127	for (i = 0; i < BR_HASH_SIZE; i++) {
	128	struct net_bridge_fdb_entry *f;
	129	struct hlist_node h, n;
	130
	131	hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
9d6f229f YH	132	if (!f->is_static &&
9d6f229f YH	133	time_before_eq(f->ageing_timer + delay, jiffies))
1da177e4 LT	134	fdb_delete(f);
	135	}
	136	}
	137	spin_unlock_bh(&br->hash_lock);
	138
	139	mod_timer(&br->gc_timer, jiffies + HZ/10);
	140	}
	141
9cf63747 SH	142	/* Completely flush all dynamic entries in forwarding database.*/
	143	void br_fdb_flush(struct net_bridge *br)
	144	{
	145	int i;
	146
	147	spin_lock_bh(&br->hash_lock);
	148	for (i = 0; i < BR_HASH_SIZE; i++) {
	149	struct net_bridge_fdb_entry *f;
	150	struct hlist_node h, n;
	151	hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
	152	if (!f->is_static)
	153	fdb_delete(f);
	154	}
	155	}
	156	spin_unlock_bh(&br->hash_lock);
	157	}
1a620698	158
9cf63747 SH	159	/* Flush all entries refering to a specific port.
	160	* if do_all is set also flush static entries
	161	*/
1a620698 SH	162	void br_fdb_delete_by_port(struct net_bridge *br,
	163	const struct net_bridge_port *p,
	164	int do_all)
1da177e4 LT	165	{
	166	int i;
	167
	168	spin_lock_bh(&br->hash_lock);
	169	for (i = 0; i < BR_HASH_SIZE; i++) {
	170	struct hlist_node h, g;
9d6f229f	171
1da177e4 LT	172	hlist_for_each_safe(h, g, &br->hash[i]) {
	173	struct net_bridge_fdb_entry *f
	174	= hlist_entry(h, struct net_bridge_fdb_entry, hlist);
9d6f229f	175	if (f->dst != p)
1da177e4 LT	176	continue;
1da177e4 LT	177
1a620698 SH	178	if (f->is_static && !do_all)
1a620698 SH	179	continue;
1da177e4 LT	180	/*
	181	* if multiple ports all have the same device address
	182	* then when one port is deleted, assign
	183	* the local entry to other port
	184	*/
	185	if (f->is_local) {
	186	struct net_bridge_port *op;
	187	list_for_each_entry(op, &br->port_list, list) {
9d6f229f	188	if (op != p &&
6ede2463 SH	189	!compare_ether_addr(op->dev->dev_addr,
6ede2463 SH	190	f->addr.addr)) {
1da177e4 LT	191	f->dst = op;
	192	goto skip_delete;
	193	}
	194	}
	195	}
	196
	197	fdb_delete(f);
	198	skip_delete: ;
	199	}
	200	}
	201	spin_unlock_bh(&br->hash_lock);
	202	}
	203
	204	/* No locking or refcounting, assumes caller has no preempt (rcu_read_lock) */
	205	struct net_bridge_fdb_entry __br_fdb_get(struct net_bridge br,
	206	const unsigned char *addr)
	207	{
	208	struct hlist_node *h;
	209	struct net_bridge_fdb_entry *fdb;
	210
	211	hlist_for_each_entry_rcu(fdb, h, &br->hash[br_mac_hash(addr)], hlist) {
6ede2463	212	if (!compare_ether_addr(fdb->addr.addr, addr)) {
1da177e4 LT	213	if (unlikely(has_expired(br, fdb)))
	214	break;
	215	return fdb;
	216	}
	217	}
	218
	219	return NULL;
	220	}
	221
	222	/* Interface used by ATM hook that keeps a ref count */
9d6f229f	223	struct net_bridge_fdb_entry br_fdb_get(struct net_bridge br,
1da177e4 LT	224	unsigned char *addr)
	225	{
	226	struct net_bridge_fdb_entry *fdb;
	227
	228	rcu_read_lock();
	229	fdb = __br_fdb_get(br, addr);
b19cbe2a PM	230	if (fdb && !atomic_inc_not_zero(&fdb->use_count))
b19cbe2a PM	231	fdb = NULL;
1da177e4 LT	232	rcu_read_unlock();
	233	return fdb;
	234	}
	235
	236	static void fdb_rcu_free(struct rcu_head *head)
	237	{
	238	struct net_bridge_fdb_entry *ent
	239	= container_of(head, struct net_bridge_fdb_entry, rcu);
	240	kmem_cache_free(br_fdb_cache, ent);
	241	}
	242
	243	/* Set entry up for deletion with RCU */
	244	void br_fdb_put(struct net_bridge_fdb_entry *ent)
	245	{
	246	if (atomic_dec_and_test(&ent->use_count))
	247	call_rcu(&ent->rcu, fdb_rcu_free);
	248	}
	249
	250	/*
9d6f229f	251	* Fill buffer with forwarding table records in
1da177e4 LT	252	* the API format.
	253	*/
	254	int br_fdb_fillbuf(struct net_bridge br, void buf,
	255	unsigned long maxnum, unsigned long skip)
	256	{
	257	struct __fdb_entry *fe = buf;
	258	int i, num = 0;
	259	struct hlist_node *h;
	260	struct net_bridge_fdb_entry *f;
	261
	262	memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
	263
	264	rcu_read_lock();
	265	for (i = 0; i < BR_HASH_SIZE; i++) {
	266	hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
	267	if (num >= maxnum)
	268	goto out;
	269
9d6f229f	270	if (has_expired(br, f))
1da177e4 LT	271	continue;
	272
	273	if (skip) {
	274	--skip;
	275	continue;
	276	}
	277
	278	/* convert from internal format to API */
	279	memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
	280	fe->port_no = f->dst->port_no;
	281	fe->is_local = f->is_local;
	282	if (!f->is_static)
	283	fe->ageing_timer_value = jiffies_to_clock_t(jiffies - f->ageing_timer);
	284	++fe;
	285	++num;
	286	}
	287	}
	288
	289	out:
	290	rcu_read_unlock();
	291
	292	return num;
	293	}
	294
	295	static inline struct net_bridge_fdb_entry fdb_find(struct hlist_head head,
	296	const unsigned char *addr)
	297	{
	298	struct hlist_node *h;
	299	struct net_bridge_fdb_entry *fdb;
	300
	301	hlist_for_each_entry_rcu(fdb, h, head, hlist) {
6ede2463	302	if (!compare_ether_addr(fdb->addr.addr, addr))
1da177e4 LT	303	return fdb;
	304	}
	305	return NULL;
	306	}
	307
	308	static struct net_bridge_fdb_entry fdb_create(struct hlist_head head,
	309	struct net_bridge_port *source,
9d6f229f	310	const unsigned char *addr,
1da177e4 LT	311	int is_local)
	312	{
	313	struct net_bridge_fdb_entry *fdb;
	314
	315	fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
	316	if (fdb) {
	317	memcpy(fdb->addr.addr, addr, ETH_ALEN);
	318	atomic_set(&fdb->use_count, 1);
	319	hlist_add_head_rcu(&fdb->hlist, head);
	320
	321	fdb->dst = source;
	322	fdb->is_local = is_local;
	323	fdb->is_static = is_local;
	324	fdb->ageing_timer = jiffies;
	325	}
	326	return fdb;
	327	}
	328
	329	static int fdb_insert(struct net_bridge br, struct net_bridge_port source,
	330	const unsigned char *addr)
	331	{
	332	struct hlist_head *head = &br->hash[br_mac_hash(addr)];
	333	struct net_bridge_fdb_entry *fdb;
	334
	335	if (!is_valid_ether_addr(addr))
	336	return -EINVAL;
	337
	338	fdb = fdb_find(head, addr);
	339	if (fdb) {
9d6f229f	340	/* it is okay to have multiple ports with same
1da177e4 LT	341	* address, just use the first one.
1da177e4 LT	342	*/
9d6f229f	343	if (fdb->is_local)
1da177e4 LT	344	return 0;
	345
	346	printk(KERN_WARNING "%s adding interface with same address "
	347	"as a received packet\n",
	348	source->dev->name);
	349	fdb_delete(fdb);
9d6f229f	350	}
1da177e4 LT	351
	352	if (!fdb_create(head, source, addr, 1))
	353	return -ENOMEM;
	354
	355	return 0;
	356	}
	357
	358	int br_fdb_insert(struct net_bridge br, struct net_bridge_port source,
	359	const unsigned char *addr)
	360	{
	361	int ret;
	362
	363	spin_lock_bh(&br->hash_lock);
	364	ret = fdb_insert(br, source, addr);
	365	spin_unlock_bh(&br->hash_lock);
	366	return ret;
	367	}
	368
	369	void br_fdb_update(struct net_bridge br, struct net_bridge_port source,
	370	const unsigned char *addr)
	371	{
	372	struct hlist_head *head = &br->hash[br_mac_hash(addr)];
	373	struct net_bridge_fdb_entry *fdb;
	374
	375	/* some users want to always flood. */
	376	if (hold_time(br) == 0)
	377	return;
	378
1da177e4 LT	379	fdb = fdb_find(head, addr);
	380	if (likely(fdb)) {
	381	/* attempt to update an entry for a local interface */
	382	if (unlikely(fdb->is_local)) {
9d6f229f	383	if (net_ratelimit())
1da177e4 LT	384	printk(KERN_WARNING "%s: received packet with "
	385	" own address as source address\n",
	386	source->dev->name);
	387	} else {
	388	/* fastpath: update of existing entry */
	389	fdb->dst = source;
	390	fdb->ageing_timer = jiffies;
	391	}
	392	} else {
f8ae737d	393	spin_lock(&br->hash_lock);
1da177e4 LT	394	if (!fdb_find(head, addr))
	395	fdb_create(head, source, addr, 0);
	396	/* else we lose race and someone else inserts
	397	* it first, don't bother updating
	398	*/
f8ae737d	399	spin_unlock(&br->hash_lock);
1da177e4	400	}
1da177e4	401	}