[deliverable/linux.git] / 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 <asm/unaligned.h>
#include <linux/if_vlan.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, __u16 vid)
{
	/* use 1 byte of OUI and 3 bytes of NIC */
	u32 key = get_unaligned((u32 *)(mac + 2));
	return jhash_2words(key, vid, fdb_salt) & (BR_HASH_SIZE - 1);
}

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);
}

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 &&
					    ether_addr_equal(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, 0);
	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 &&
					    ether_addr_equal(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,
					  __u16 vid)
{
	struct hlist_node *h;
	struct net_bridge_fdb_entry *fdb;

	hlist_for_each_entry_rcu(fdb, h,
				&br->hash[br_mac_hash(addr, vid)], hlist) {
		if (ether_addr_equal(fdb->addr.addr, addr) &&
		    fdb->vlan_id == vid) {
			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, 0);
		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_delta_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,
					     __u16 vid)
{
	struct hlist_node *h;
	struct net_bridge_fdb_entry *fdb;

	hlist_for_each_entry(fdb, h, head, hlist) {
		if (ether_addr_equal(fdb->addr.addr, addr) &&
		    fdb->vlan_id == vid)
			return fdb;
	}
	return NULL;
}

static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
						 const unsigned char *addr,
						 __u16 vid)
{
	struct hlist_node *h;
	struct net_bridge_fdb_entry *fdb;

	hlist_for_each_entry_rcu(fdb, h, head, hlist) {
		if (ether_addr_equal(fdb->addr.addr, addr) &&
		    fdb->vlan_id == vid)
			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,
					       __u16 vid)
{
	struct net_bridge_fdb_entry *fdb;

	fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
	if (fdb) {
		memcpy(fdb->addr.addr, addr, ETH_ALEN);
		fdb->dst = source;
		fdb->vlan_id = vid;
		fdb->is_local = 0;
		fdb->is_static = 0;
		fdb->updated = fdb->used = jiffies;
		hlist_add_head_rcu(&fdb->hlist, head);
	}
	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, 0)];
	struct net_bridge_fdb_entry *fdb;

	if (!is_valid_ether_addr(addr))
		return -EINVAL;

	fdb = fdb_find(head, addr, 0);
	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, 0);
	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;
}

void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
		   const unsigned char *addr, u16 vid)
{
	struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
	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, vid);
	if (likely(fdb)) {
		/* attempt to update an entry for a local interface */
		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 */
			fdb->dst = source;
			fdb->updated = jiffies;
		}
	} else {
		spin_lock(&br->hash_lock);
		if (likely(!fdb_find(head, addr, vid))) {
			fdb = fdb_create(head, source, addr, vid);
			if (fdb)
				fdb_notify(br, fdb, RTM_NEWNEIGH);
		}
		/* else  we lose race and someone else inserts
		 * it first, don't bother updating
		 */
		spin_unlock(&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 portid, 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, portid, 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);

	if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr))
		goto nla_put_failure;
	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;
	if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
		goto nla_put_failure;
	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;
	}
	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_device *dev,
		int idx)
{
	struct net_bridge *br = netdev_priv(dev);
	int i;

	if (!(dev->priv_flags & IFF_EBRIDGE))
		goto out;

	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).portid,
					  cb->nlh->nlmsg_seq,
					  RTM_NEWNEIGH,
					  NLM_F_MULTI) < 0)
				break;
skip:
			++idx;
		}
	}

out:
	return idx;
}

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

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

		fdb = fdb_create(head, source, addr, vid);
		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 ndmsg *ndm, struct nlattr *tb[],
	       struct net_device *dev,
	       const unsigned char *addr, u16 nlh_flags)
{
	struct net_bridge_port *p;
	int err = 0;

	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) {
		rcu_read_lock();
		br_fdb_update(p->br, p, addr, 0);
		rcu_read_unlock();
	} else {
		spin_lock_bh(&p->br->hash_lock);
		err = fdb_add_entry(p, addr, ndm->ndm_state, nlh_flags,
				0);
		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, 0)];
	struct net_bridge_fdb_entry *fdb;

	fdb = fdb_find(head, addr, 0);
	if (!fdb)
		return -ENOENT;

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

/* Remove neighbor entry with RTM_DELNEIGH */
int br_fdb_delete(struct ndmsg *ndm, struct net_device *dev,
		  const unsigned char *addr)
{
	struct net_bridge_port *p;
	int err;

	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;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Forwarding database
	3	* Linux ethernet bridge
	4	*
	5	* Authors:
	6	* Lennert Buytenhek <buytenh@gnu.org>
	7	*
1da177e4 LT	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* as published by the Free Software Foundation; either version
	11	* 2 of the License, or (at your option) any later version.
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/init.h>
82524746	16	#include <linux/rculist.h>
1da177e4 LT	17	#include <linux/spinlock.h>
	18	#include <linux/times.h>
	19	#include <linux/netdevice.h>
	20	#include <linux/etherdevice.h>
	21	#include <linux/jhash.h>
3f890923	22	#include <linux/random.h>
5a0e3ad6	23	#include <linux/slab.h>
60063497	24	#include <linux/atomic.h>
3f890923	25	#include <asm/unaligned.h>
2ba071ec	26	#include <linux/if_vlan.h>
1da177e4 LT	27	#include "br_private.h"
1da177e4 LT	28
e18b890b	29	static struct kmem_cache *br_fdb_cache __read_mostly;
1da177e4 LT	30	static int fdb_insert(struct net_bridge br, struct net_bridge_port source,
1da177e4 LT	31	const unsigned char *addr);
31e8a49c	32	static void fdb_notify(struct net_bridge *br,
31e8a49c	33	const struct net_bridge_fdb_entry *, int);
1da177e4	34
3f890923 SH	35	static u32 fdb_salt __read_mostly;
3f890923 SH	36
87a596e0	37	int __init br_fdb_init(void)
1da177e4 LT	38	{
	39	br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
	40	sizeof(struct net_bridge_fdb_entry),
	41	0,
20c2df83	42	SLAB_HWCACHE_ALIGN, NULL);
87a596e0 AM	43	if (!br_fdb_cache)
	44	return -ENOMEM;
	45
3f890923	46	get_random_bytes(&fdb_salt, sizeof(fdb_salt));
87a596e0	47	return 0;
1da177e4 LT	48	}
1da177e4 LT	49
73afc906	50	void br_fdb_fini(void)
1da177e4 LT	51	{
	52	kmem_cache_destroy(br_fdb_cache);
	53	}
	54
	55
	56	/* if topology_changing then use forward_delay (default 15 sec)
	57	* otherwise keep longer (default 5 minutes)
	58	*/
3f890923	59	static inline unsigned long hold_time(const struct net_bridge *br)
1da177e4 LT	60	{
	61	return br->topology_change ? br->forward_delay : br->ageing_time;
	62	}
	63
3f890923	64	static inline int has_expired(const struct net_bridge *br,
1da177e4 LT	65	const struct net_bridge_fdb_entry *fdb)
1da177e4 LT	66	{
f64f9e71	67	return !fdb->is_static &&
7cd8861a	68	time_before_eq(fdb->updated + hold_time(br), jiffies);
1da177e4 LT	69	}
1da177e4 LT	70
2ba071ec	71	static inline int br_mac_hash(const unsigned char *mac, __u16 vid)
1da177e4	72	{
2ba071ec	73	/* use 1 byte of OUI and 3 bytes of NIC */
3f890923	74	u32 key = get_unaligned((u32 *)(mac + 2));
2ba071ec	75	return jhash_2words(key, vid, fdb_salt) & (BR_HASH_SIZE - 1);
1da177e4 LT	76	}
1da177e4 LT	77
da678292 MM	78	static void fdb_rcu_free(struct rcu_head *head)
	79	{
	80	struct net_bridge_fdb_entry *ent
	81	= container_of(head, struct net_bridge_fdb_entry, rcu);
	82	kmem_cache_free(br_fdb_cache, ent);
	83	}
	84
31e8a49c	85	static void fdb_delete(struct net_bridge br, struct net_bridge_fdb_entry f)
1da177e4 LT	86	{
1da177e4 LT	87	hlist_del_rcu(&f->hlist);
31e8a49c	88	fdb_notify(br, f, RTM_DELNEIGH);
da678292	89	call_rcu(&f->rcu, fdb_rcu_free);
1da177e4 LT	90	}
	91
	92	void br_fdb_changeaddr(struct net_bridge_port p, const unsigned char newaddr)
	93	{
	94	struct net_bridge *br = p->br;
	95	int i;
9d6f229f	96
1da177e4 LT	97	spin_lock_bh(&br->hash_lock);
	98
	99	/* Search all chains since old address/hash is unknown */
	100	for (i = 0; i < BR_HASH_SIZE; i++) {
	101	struct hlist_node *h;
	102	hlist_for_each(h, &br->hash[i]) {
	103	struct net_bridge_fdb_entry *f;
	104
	105	f = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
	106	if (f->dst == p && f->is_local) {
	107	/* maybe another port has same hw addr? */
	108	struct net_bridge_port *op;
	109	list_for_each_entry(op, &br->port_list, list) {
9d6f229f	110	if (op != p &&
9a7b6ef9 JP	111	ether_addr_equal(op->dev->dev_addr,
9a7b6ef9 JP	112	f->addr.addr)) {
1da177e4 LT	113	f->dst = op;
	114	goto insert;
	115	}
	116	}
	117
	118	/* delete old one */
31e8a49c	119	fdb_delete(br, f);
1da177e4 LT	120	goto insert;
	121	}
	122	}
	123	}
	124	insert:
	125	/* insert new address, may fail if invalid address or dup. */
	126	fdb_insert(br, p, newaddr);
	127
	128	spin_unlock_bh(&br->hash_lock);
	129	}
	130
43598813	131	void br_fdb_change_mac_address(struct net_bridge br, const u8 newaddr)
	132	{
	133	struct net_bridge_fdb_entry *f;
	134
	135	/* If old entry was unassociated with any port, then delete it. */
2ba071ec	136	f = __br_fdb_get(br, br->dev->dev_addr, 0);
43598813	137	if (f && f->is_local && !f->dst)
	138	fdb_delete(br, f);
	139
	140	fdb_insert(br, NULL, newaddr);
	141	}
	142
1da177e4 LT	143	void br_fdb_cleanup(unsigned long _data)
	144	{
	145	struct net_bridge br = (struct net_bridge )_data;
	146	unsigned long delay = hold_time(br);
25442e06	147	unsigned long next_timer = jiffies + br->ageing_time;
1da177e4 LT	148	int i;
1da177e4 LT	149
27a42938	150	spin_lock(&br->hash_lock);
1da177e4 LT	151	for (i = 0; i < BR_HASH_SIZE; i++) {
	152	struct net_bridge_fdb_entry *f;
	153	struct hlist_node h, n;
	154
	155	hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
071f7722 BE	156	unsigned long this_timer;
	157	if (f->is_static)
	158	continue;
7cd8861a	159	this_timer = f->updated + delay;
071f7722	160	if (time_before_eq(this_timer, jiffies))
31e8a49c	161	fdb_delete(br, f);
2bec008c	162	else if (time_before(this_timer, next_timer))
071f7722	163	next_timer = this_timer;
1da177e4 LT	164	}
1da177e4 LT	165	}
27a42938	166	spin_unlock(&br->hash_lock);
1da177e4	167
25442e06	168	mod_timer(&br->gc_timer, round_jiffies_up(next_timer));
1da177e4 LT	169	}
1da177e4 LT	170
9cf63747 SH	171	/* Completely flush all dynamic entries in forwarding database.*/
	172	void br_fdb_flush(struct net_bridge *br)
	173	{
	174	int i;
	175
	176	spin_lock_bh(&br->hash_lock);
	177	for (i = 0; i < BR_HASH_SIZE; i++) {
	178	struct net_bridge_fdb_entry *f;
	179	struct hlist_node h, n;
	180	hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
	181	if (!f->is_static)
31e8a49c	182	fdb_delete(br, f);
9cf63747 SH	183	}
	184	}
	185	spin_unlock_bh(&br->hash_lock);
	186	}
1a620698	187
25985edc	188	/* Flush all entries referring to a specific port.
9cf63747 SH	189	* if do_all is set also flush static entries
9cf63747 SH	190	*/
1a620698 SH	191	void br_fdb_delete_by_port(struct net_bridge *br,
	192	const struct net_bridge_port *p,
	193	int do_all)
1da177e4 LT	194	{
	195	int i;
	196
	197	spin_lock_bh(&br->hash_lock);
	198	for (i = 0; i < BR_HASH_SIZE; i++) {
	199	struct hlist_node h, g;
9d6f229f	200
1da177e4 LT	201	hlist_for_each_safe(h, g, &br->hash[i]) {
	202	struct net_bridge_fdb_entry *f
	203	= hlist_entry(h, struct net_bridge_fdb_entry, hlist);
9d6f229f	204	if (f->dst != p)
1da177e4 LT	205	continue;
1da177e4 LT	206
1a620698 SH	207	if (f->is_static && !do_all)
1a620698 SH	208	continue;
1da177e4 LT	209	/*
	210	* if multiple ports all have the same device address
	211	* then when one port is deleted, assign
	212	* the local entry to other port
	213	*/
	214	if (f->is_local) {
	215	struct net_bridge_port *op;
	216	list_for_each_entry(op, &br->port_list, list) {
9d6f229f	217	if (op != p &&
9a7b6ef9 JP	218	ether_addr_equal(op->dev->dev_addr,
9a7b6ef9 JP	219	f->addr.addr)) {
1da177e4 LT	220	f->dst = op;
	221	goto skip_delete;
	222	}
	223	}
	224	}
	225
31e8a49c	226	fdb_delete(br, f);
1da177e4 LT	227	skip_delete: ;
	228	}
	229	}
	230	spin_unlock_bh(&br->hash_lock);
	231	}
	232
eeaf61d8	233	/* No locking or refcounting, assumes caller has rcu_read_lock */
1da177e4	234	struct net_bridge_fdb_entry __br_fdb_get(struct net_bridge br,
2ba071ec VY	235	const unsigned char *addr,
2ba071ec VY	236	__u16 vid)
1da177e4 LT	237	{
	238	struct hlist_node *h;
	239	struct net_bridge_fdb_entry *fdb;
	240
2ba071ec VY	241	hlist_for_each_entry_rcu(fdb, h,
	242	&br->hash[br_mac_hash(addr, vid)], hlist) {
	243	if (ether_addr_equal(fdb->addr.addr, addr) &&
	244	fdb->vlan_id == vid) {
1da177e4 LT	245	if (unlikely(has_expired(br, fdb)))
	246	break;
	247	return fdb;
	248	}
	249	}
	250
	251	return NULL;
	252	}
	253
e6373c4c	254	#if IS_ENABLED(CONFIG_ATM_LANE)
da678292 MM	255	/* Interface used by ATM LANE hook to test
	256	* if an addr is on some other bridge port */
	257	int br_fdb_test_addr(struct net_device dev, unsigned char addr)
1da177e4 LT	258	{
1da177e4 LT	259	struct net_bridge_fdb_entry *fdb;
b5ed54e9	260	struct net_bridge_port *port;
da678292 MM	261	int ret;
da678292 MM	262
1da177e4	263	rcu_read_lock();
b5ed54e9	264	port = br_port_get_rcu(dev);
	265	if (!port)
	266	ret = 0;
	267	else {
2ba071ec	268	fdb = __br_fdb_get(port->br, addr, 0);
43598813	269	ret = fdb && fdb->dst && fdb->dst->dev != dev &&
b5ed54e9	270	fdb->dst->state == BR_STATE_FORWARDING;
b5ed54e9	271	}
1da177e4	272	rcu_read_unlock();
1da177e4	273
da678292	274	return ret;
1da177e4	275	}
da678292	276	#endif /* CONFIG_ATM_LANE */
1da177e4 LT	277
1da177e4 LT	278	/*
9d6f229f	279	* Fill buffer with forwarding table records in
1da177e4 LT	280	* the API format.
	281	*/
	282	int br_fdb_fillbuf(struct net_bridge br, void buf,
	283	unsigned long maxnum, unsigned long skip)
	284	{
	285	struct __fdb_entry *fe = buf;
	286	int i, num = 0;
	287	struct hlist_node *h;
	288	struct net_bridge_fdb_entry *f;
	289
	290	memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
	291
	292	rcu_read_lock();
	293	for (i = 0; i < BR_HASH_SIZE; i++) {
	294	hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
	295	if (num >= maxnum)
	296	goto out;
	297
9d6f229f	298	if (has_expired(br, f))
1da177e4 LT	299	continue;
1da177e4 LT	300
43598813	301	/* ignore pseudo entry for local MAC address */
	302	if (!f->dst)
	303	continue;
	304
1da177e4 LT	305	if (skip) {
	306	--skip;
	307	continue;
	308	}
	309
	310	/* convert from internal format to API */
	311	memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
ae4f8fca SH	312
ae4f8fca SH	313	/* due to ABI compat need to split into hi/lo */
1da177e4	314	fe->port_no = f->dst->port_no;
ae4f8fca SH	315	fe->port_hi = f->dst->port_no >> 8;
ae4f8fca SH	316
1da177e4 LT	317	fe->is_local = f->is_local;
1da177e4 LT	318	if (!f->is_static)
a399a805	319	fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
1da177e4 LT	320	++fe;
	321	++num;
	322	}
	323	}
	324
	325	out:
	326	rcu_read_unlock();
	327
	328	return num;
	329	}
	330
664de48b	331	static struct net_bridge_fdb_entry fdb_find(struct hlist_head head,
2ba071ec VY	332	const unsigned char *addr,
2ba071ec VY	333	__u16 vid)
664de48b	334	{
	335	struct hlist_node *h;
	336	struct net_bridge_fdb_entry *fdb;
	337
	338	hlist_for_each_entry(fdb, h, head, hlist) {
2ba071ec VY	339	if (ether_addr_equal(fdb->addr.addr, addr) &&
2ba071ec VY	340	fdb->vlan_id == vid)
664de48b	341	return fdb;
	342	}
	343	return NULL;
	344	}
	345
	346	static struct net_bridge_fdb_entry fdb_find_rcu(struct hlist_head head,
2ba071ec VY	347	const unsigned char *addr,
2ba071ec VY	348	__u16 vid)
1da177e4 LT	349	{
	350	struct hlist_node *h;
	351	struct net_bridge_fdb_entry *fdb;
	352
	353	hlist_for_each_entry_rcu(fdb, h, head, hlist) {
2ba071ec VY	354	if (ether_addr_equal(fdb->addr.addr, addr) &&
2ba071ec VY	355	fdb->vlan_id == vid)
1da177e4 LT	356	return fdb;
	357	}
	358	return NULL;
	359	}
	360
	361	static struct net_bridge_fdb_entry fdb_create(struct hlist_head head,
	362	struct net_bridge_port *source,
2ba071ec VY	363	const unsigned char *addr,
2ba071ec VY	364	__u16 vid)
1da177e4 LT	365	{
	366	struct net_bridge_fdb_entry *fdb;
	367
	368	fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
	369	if (fdb) {
	370	memcpy(fdb->addr.addr, addr, ETH_ALEN);
1da177e4	371	fdb->dst = source;
2ba071ec	372	fdb->vlan_id = vid;
03e9b64b	373	fdb->is_local = 0;
03e9b64b	374	fdb->is_static = 0;
7cd8861a	375	fdb->updated = fdb->used = jiffies;
1158f762	376	hlist_add_head_rcu(&fdb->hlist, head);
1da177e4 LT	377	}
	378	return fdb;
	379	}
	380
	381	static int fdb_insert(struct net_bridge br, struct net_bridge_port source,
	382	const unsigned char *addr)
	383	{
2ba071ec	384	struct hlist_head *head = &br->hash[br_mac_hash(addr, 0)];
1da177e4 LT	385	struct net_bridge_fdb_entry *fdb;
	386
	387	if (!is_valid_ether_addr(addr))
	388	return -EINVAL;
	389
2ba071ec	390	fdb = fdb_find(head, addr, 0);
1da177e4	391	if (fdb) {
9d6f229f	392	/* it is okay to have multiple ports with same
1da177e4 LT	393	* address, just use the first one.
1da177e4 LT	394	*/
9d6f229f	395	if (fdb->is_local)
1da177e4	396	return 0;
28a16c97	397	br_warn(br, "adding interface %s with same address "
1da177e4 LT	398	"as a received packet\n",
1da177e4 LT	399	source->dev->name);
31e8a49c	400	fdb_delete(br, fdb);
9d6f229f	401	}
1da177e4	402
2ba071ec	403	fdb = fdb_create(head, source, addr, 0);
03e9b64b	404	if (!fdb)
1da177e4 LT	405	return -ENOMEM;
1da177e4 LT	406
03e9b64b	407	fdb->is_local = fdb->is_static = 1;
31e8a49c	408	fdb_notify(br, fdb, RTM_NEWNEIGH);
1da177e4 LT	409	return 0;
	410	}
	411
03e9b64b	412	/* Add entry for local address of interface */
1da177e4 LT	413	int br_fdb_insert(struct net_bridge br, struct net_bridge_port source,
	414	const unsigned char *addr)
	415	{
	416	int ret;
	417
	418	spin_lock_bh(&br->hash_lock);
	419	ret = fdb_insert(br, source, addr);
	420	spin_unlock_bh(&br->hash_lock);
	421	return ret;
	422	}
	423
	424	void br_fdb_update(struct net_bridge br, struct net_bridge_port source,
2ba071ec	425	const unsigned char *addr, u16 vid)
1da177e4	426	{
2ba071ec	427	struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
1da177e4 LT	428	struct net_bridge_fdb_entry *fdb;
	429
	430	/* some users want to always flood. */
	431	if (hold_time(br) == 0)
	432	return;
	433
df1c0b84 SH	434	/* ignore packets unless we are using this port */
	435	if (!(source->state == BR_STATE_LEARNING \|\|
	436	source->state == BR_STATE_FORWARDING))
	437	return;
	438
2ba071ec	439	fdb = fdb_find_rcu(head, addr, vid);
1da177e4 LT	440	if (likely(fdb)) {
	441	/* attempt to update an entry for a local interface */
	442	if (unlikely(fdb->is_local)) {
9d6f229f	443	if (net_ratelimit())
28a16c97	444	br_warn(br, "received packet on %s with "
	445	"own address as source address\n",
	446	source->dev->name);
1da177e4 LT	447	} else {
	448	/* fastpath: update of existing entry */
	449	fdb->dst = source;
7cd8861a	450	fdb->updated = jiffies;
1da177e4 LT	451	}
1da177e4 LT	452	} else {
f8ae737d	453	spin_lock(&br->hash_lock);
2ba071ec VY	454	if (likely(!fdb_find(head, addr, vid))) {
2ba071ec VY	455	fdb = fdb_create(head, source, addr, vid);
f58ee4e1	456	if (fdb)
31e8a49c	457	fdb_notify(br, fdb, RTM_NEWNEIGH);
f58ee4e1	458	}
1da177e4 LT	459	/* else we lose race and someone else inserts
	460	* it first, don't bother updating
	461	*/
f8ae737d	462	spin_unlock(&br->hash_lock);
1da177e4	463	}
1da177e4	464	}
b078f0df	465
	466	static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb)
	467	{
	468	if (fdb->is_local)
	469	return NUD_PERMANENT;
	470	else if (fdb->is_static)
	471	return NUD_NOARP;
	472	else if (has_expired(fdb->dst->br, fdb))
	473	return NUD_STALE;
	474	else
	475	return NUD_REACHABLE;
	476	}
	477
31e8a49c	478	static int fdb_fill_info(struct sk_buff skb, const struct net_bridge br,
b078f0df	479	const struct net_bridge_fdb_entry *fdb,
15e47304	480	u32 portid, u32 seq, int type, unsigned int flags)
b078f0df	481	{
	482	unsigned long now = jiffies;
	483	struct nda_cacheinfo ci;
	484	struct nlmsghdr *nlh;
	485	struct ndmsg *ndm;
	486
15e47304	487	nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
b078f0df	488	if (nlh == NULL)
	489	return -EMSGSIZE;
	490
b078f0df	491	ndm = nlmsg_data(nlh);
	492	ndm->ndm_family = AF_BRIDGE;
	493	ndm->ndm_pad1 = 0;
	494	ndm->ndm_pad2 = 0;
	495	ndm->ndm_flags = 0;
	496	ndm->ndm_type = 0;
43598813	497	ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
b078f0df	498	ndm->ndm_state = fdb_to_nud(fdb);
b078f0df	499
2eb812e6 DM	500	if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr))
2eb812e6 DM	501	goto nla_put_failure;
b078f0df	502	ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
	503	ci.ndm_confirmed = 0;
	504	ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
	505	ci.ndm_refcnt = 0;
2eb812e6 DM	506	if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
2eb812e6 DM	507	goto nla_put_failure;
b078f0df	508	return nlmsg_end(skb, nlh);
	509
	510	nla_put_failure:
	511	nlmsg_cancel(skb, nlh);
	512	return -EMSGSIZE;
	513	}
	514
	515	static inline size_t fdb_nlmsg_size(void)
	516	{
	517	return NLMSG_ALIGN(sizeof(struct ndmsg))
	518	+ nla_total_size(ETH_ALEN) /* NDA_LLADDR */
	519	+ nla_total_size(sizeof(struct nda_cacheinfo));
	520	}
	521
31e8a49c	522	static void fdb_notify(struct net_bridge *br,
31e8a49c	523	const struct net_bridge_fdb_entry *fdb, int type)
b078f0df	524	{
31e8a49c	525	struct net *net = dev_net(br->dev);
b078f0df	526	struct sk_buff *skb;
	527	int err = -ENOBUFS;
	528
	529	skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
	530	if (skb == NULL)
	531	goto errout;
	532
31e8a49c	533	err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
b078f0df	534	if (err < 0) {
	535	/* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
	536	WARN_ON(err == -EMSGSIZE);
	537	kfree_skb(skb);
	538	goto errout;
	539	}
	540	rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
	541	return;
	542	errout:
	543	if (err < 0)
	544	rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
	545	}
	546
	547	/* Dump information about entries, in response to GETNEIGH */
77162022 JF	548	int br_fdb_dump(struct sk_buff *skb,
	549	struct netlink_callback *cb,
	550	struct net_device *dev,
	551	int idx)
b078f0df	552	{
77162022 JF	553	struct net_bridge *br = netdev_priv(dev);
77162022 JF	554	int i;
b078f0df	555
77162022 JF	556	if (!(dev->priv_flags & IFF_EBRIDGE))
77162022 JF	557	goto out;
b078f0df	558
77162022 JF	559	for (i = 0; i < BR_HASH_SIZE; i++) {
	560	struct hlist_node *h;
	561	struct net_bridge_fdb_entry *f;
b078f0df	562
77162022 JF	563	hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
	564	if (idx < cb->args[0])
	565	goto skip;
	566
	567	if (fdb_fill_info(skb, br, f,
15e47304	568	NETLINK_CB(cb->skb).portid,
77162022 JF	569	cb->nlh->nlmsg_seq,
	570	RTM_NEWNEIGH,
	571	NLM_F_MULTI) < 0)
	572	break;
b078f0df	573	skip:
77162022	574	++idx;
b078f0df	575	}
b078f0df	576	}
b078f0df	577
77162022 JF	578	out:
77162022 JF	579	return idx;
b078f0df	580	}
36fd2b63	581
292d1398	582	/* Update (create or replace) forwarding database entry */
36fd2b63	583	static int fdb_add_entry(struct net_bridge_port source, const __u8 addr,
2ba071ec	584	__u16 state, __u16 flags, __u16 vid)
36fd2b63	585	{
36fd2b63	586	struct net_bridge *br = source->br;
2ba071ec	587	struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
36fd2b63	588	struct net_bridge_fdb_entry *fdb;
36fd2b63	589
2ba071ec	590	fdb = fdb_find(head, addr, vid);
64af1bac	591	if (fdb == NULL) {
	592	if (!(flags & NLM_F_CREATE))
	593	return -ENOENT;
36fd2b63	594
2ba071ec	595	fdb = fdb_create(head, source, addr, vid);
64af1bac	596	if (!fdb)
64af1bac	597	return -ENOMEM;
31e8a49c	598	fdb_notify(br, fdb, RTM_NEWNEIGH);
64af1bac	599	} else {
	600	if (flags & NLM_F_EXCL)
	601	return -EEXIST;
292d1398	602	}
	603
	604	if (fdb_to_nud(fdb) != state) {
	605	if (state & NUD_PERMANENT)
	606	fdb->is_local = fdb->is_static = 1;
	607	else if (state & NUD_NOARP) {
	608	fdb->is_local = 0;
	609	fdb->is_static = 1;
	610	} else
	611	fdb->is_local = fdb->is_static = 0;
64af1bac	612
292d1398	613	fdb->updated = fdb->used = jiffies;
31e8a49c	614	fdb_notify(br, fdb, RTM_NEWNEIGH);
64af1bac	615	}
36fd2b63	616
36fd2b63	617	return 0;
	618	}
	619
	620	/* Add new permanent fdb entry with RTM_NEWNEIGH */
edc7d573	621	int br_fdb_add(struct ndmsg ndm, struct nlattr tb[],
edc7d573	622	struct net_device *dev,
6b6e2725	623	const unsigned char *addr, u16 nlh_flags)
36fd2b63	624	{
36fd2b63	625	struct net_bridge_port *p;
77162022	626	int err = 0;
36fd2b63	627
292d1398	628	if (!(ndm->ndm_state & (NUD_PERMANENT\|NUD_NOARP\|NUD_REACHABLE))) {
	629	pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
	630	return -EINVAL;
	631	}
	632
36fd2b63	633	p = br_port_get_rtnl(dev);
	634	if (p == NULL) {
	635	pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
	636	dev->name);
	637	return -EINVAL;
	638	}
	639
292d1398	640	if (ndm->ndm_flags & NTF_USE) {
292d1398	641	rcu_read_lock();
2ba071ec	642	br_fdb_update(p->br, p, addr, 0);
292d1398	643	rcu_read_unlock();
	644	} else {
	645	spin_lock_bh(&p->br->hash_lock);
2ba071ec VY	646	err = fdb_add_entry(p, addr, ndm->ndm_state, nlh_flags,
2ba071ec VY	647	0);
292d1398	648	spin_unlock_bh(&p->br->hash_lock);
292d1398	649	}
36fd2b63	650
	651	return err;
	652	}
	653
6b6e2725	654	static int fdb_delete_by_addr(struct net_bridge_port p, const u8 addr)
36fd2b63	655	{
36fd2b63	656	struct net_bridge *br = p->br;
2ba071ec	657	struct hlist_head *head = &br->hash[br_mac_hash(addr, 0)];
36fd2b63	658	struct net_bridge_fdb_entry *fdb;
36fd2b63	659
2ba071ec	660	fdb = fdb_find(head, addr, 0);
36fd2b63	661	if (!fdb)
	662	return -ENOENT;
	663
31e8a49c	664	fdb_delete(p->br, fdb);
36fd2b63	665	return 0;
	666	}
	667
	668	/* Remove neighbor entry with RTM_DELNEIGH */
77162022	669	int br_fdb_delete(struct ndmsg ndm, struct net_device dev,
6b6e2725	670	const unsigned char *addr)
36fd2b63	671	{
36fd2b63	672	struct net_bridge_port *p;
36fd2b63	673	int err;
36fd2b63	674
36fd2b63	675	p = br_port_get_rtnl(dev);
	676	if (p == NULL) {
	677	pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
	678	dev->name);
	679	return -EINVAL;
	680	}
	681
	682	spin_lock_bh(&p->br->hash_lock);
	683	err = fdb_delete_by_addr(p, addr);
	684	spin_unlock_bh(&p->br->hash_lock);
	685
	686	return err;
	687	}