[GitHub/mt8127/android_kernel_alcatel_ttab.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 "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);
}

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 &&
					    !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_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_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) {
			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_bh(&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 defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
/* 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->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;

			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) {
		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);
	}
	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;
}

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 (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))) {
			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(&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->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;
	}
	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) {
		rcu_read_lock();
		br_fdb_update(p->br, p, addr);
		rcu_read_unlock();
	} 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;
}
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>
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,
1da177e4 LT	30	const unsigned char *addr);
31e8a49c	31	static void fdb_notify(struct net_bridge *br,
31e8a49c	32	const struct net_bridge_fdb_entry *, int);
1da177e4	33
3f890923 SH	34	static u32 fdb_salt __read_mostly;
3f890923 SH	35
87a596e0	36	int __init br_fdb_init(void)
1da177e4 LT	37	{
	38	br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
	39	sizeof(struct net_bridge_fdb_entry),
	40	0,
20c2df83	41	SLAB_HWCACHE_ALIGN, NULL);
87a596e0 AM	42	if (!br_fdb_cache)
	43	return -ENOMEM;
	44
3f890923	45	get_random_bytes(&fdb_salt, sizeof(fdb_salt));
87a596e0	46	return 0;
1da177e4 LT	47	}
1da177e4 LT	48
73afc906	49	void br_fdb_fini(void)
1da177e4 LT	50	{
	51	kmem_cache_destroy(br_fdb_cache);
	52	}
	53
	54
	55	/* if topology_changing then use forward_delay (default 15 sec)
	56	* otherwise keep longer (default 5 minutes)
	57	*/
3f890923	58	static inline unsigned long hold_time(const struct net_bridge *br)
1da177e4 LT	59	{
	60	return br->topology_change ? br->forward_delay : br->ageing_time;
	61	}
	62
3f890923	63	static inline int has_expired(const struct net_bridge *br,
1da177e4 LT	64	const struct net_bridge_fdb_entry *fdb)
1da177e4 LT	65	{
f64f9e71	66	return !fdb->is_static &&
7cd8861a	67	time_before_eq(fdb->updated + hold_time(br), jiffies);
1da177e4 LT	68	}
1da177e4 LT	69
3f890923	70	static inline int br_mac_hash(const unsigned char *mac)
1da177e4	71	{
3f890923 SH	72	/* use 1 byte of OUI cnd 3 bytes of NIC */
	73	u32 key = get_unaligned((u32 *)(mac + 2));
	74	return jhash_1word(key, fdb_salt) & (BR_HASH_SIZE - 1);
1da177e4 LT	75	}
1da177e4 LT	76
da678292 MM	77	static void fdb_rcu_free(struct rcu_head *head)
	78	{
	79	struct net_bridge_fdb_entry *ent
	80	= container_of(head, struct net_bridge_fdb_entry, rcu);
	81	kmem_cache_free(br_fdb_cache, ent);
	82	}
	83
31e8a49c	84	static void fdb_delete(struct net_bridge br, struct net_bridge_fdb_entry f)
1da177e4 LT	85	{
1da177e4 LT	86	hlist_del_rcu(&f->hlist);
31e8a49c	87	fdb_notify(br, f, RTM_DELNEIGH);
da678292	88	call_rcu(&f->rcu, fdb_rcu_free);
1da177e4 LT	89	}
	90
	91	void br_fdb_changeaddr(struct net_bridge_port p, const unsigned char newaddr)
	92	{
	93	struct net_bridge *br = p->br;
	94	int i;
9d6f229f	95
1da177e4 LT	96	spin_lock_bh(&br->hash_lock);
	97
	98	/* Search all chains since old address/hash is unknown */
	99	for (i = 0; i < BR_HASH_SIZE; i++) {
	100	struct hlist_node *h;
	101	hlist_for_each(h, &br->hash[i]) {
	102	struct net_bridge_fdb_entry *f;
	103
	104	f = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
	105	if (f->dst == p && f->is_local) {
	106	/* maybe another port has same hw addr? */
	107	struct net_bridge_port *op;
	108	list_for_each_entry(op, &br->port_list, list) {
9d6f229f	109	if (op != p &&
6ede2463 SH	110	!compare_ether_addr(op->dev->dev_addr,
6ede2463 SH	111	f->addr.addr)) {
1da177e4 LT	112	f->dst = op;
	113	goto insert;
	114	}
	115	}
	116
	117	/* delete old one */
31e8a49c	118	fdb_delete(br, f);
1da177e4 LT	119	goto insert;
	120	}
	121	}
	122	}
	123	insert:
	124	/* insert new address, may fail if invalid address or dup. */
	125	fdb_insert(br, p, newaddr);
	126
	127	spin_unlock_bh(&br->hash_lock);
	128	}
	129
	130	void br_fdb_cleanup(unsigned long _data)
	131	{
	132	struct net_bridge br = (struct net_bridge )_data;
	133	unsigned long delay = hold_time(br);
25442e06	134	unsigned long next_timer = jiffies + br->ageing_time;
1da177e4 LT	135	int i;
	136
	137	spin_lock_bh(&br->hash_lock);
	138	for (i = 0; i < BR_HASH_SIZE; i++) {
	139	struct net_bridge_fdb_entry *f;
	140	struct hlist_node h, n;
	141
	142	hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
071f7722 BE	143	unsigned long this_timer;
	144	if (f->is_static)
	145	continue;
7cd8861a	146	this_timer = f->updated + delay;
071f7722	147	if (time_before_eq(this_timer, jiffies))
31e8a49c	148	fdb_delete(br, f);
2bec008c	149	else if (time_before(this_timer, next_timer))
071f7722	150	next_timer = this_timer;
1da177e4 LT	151	}
	152	}
	153	spin_unlock_bh(&br->hash_lock);
	154
25442e06	155	mod_timer(&br->gc_timer, round_jiffies_up(next_timer));
1da177e4 LT	156	}
1da177e4 LT	157
9cf63747 SH	158	/* Completely flush all dynamic entries in forwarding database.*/
	159	void br_fdb_flush(struct net_bridge *br)
	160	{
	161	int i;
	162
	163	spin_lock_bh(&br->hash_lock);
	164	for (i = 0; i < BR_HASH_SIZE; i++) {
	165	struct net_bridge_fdb_entry *f;
	166	struct hlist_node h, n;
	167	hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
	168	if (!f->is_static)
31e8a49c	169	fdb_delete(br, f);
9cf63747 SH	170	}
	171	}
	172	spin_unlock_bh(&br->hash_lock);
	173	}
1a620698	174
25985edc	175	/* Flush all entries referring to a specific port.
9cf63747 SH	176	* if do_all is set also flush static entries
9cf63747 SH	177	*/
1a620698 SH	178	void br_fdb_delete_by_port(struct net_bridge *br,
	179	const struct net_bridge_port *p,
	180	int do_all)
1da177e4 LT	181	{
	182	int i;
	183
	184	spin_lock_bh(&br->hash_lock);
	185	for (i = 0; i < BR_HASH_SIZE; i++) {
	186	struct hlist_node h, g;
9d6f229f	187
1da177e4 LT	188	hlist_for_each_safe(h, g, &br->hash[i]) {
	189	struct net_bridge_fdb_entry *f
	190	= hlist_entry(h, struct net_bridge_fdb_entry, hlist);
9d6f229f	191	if (f->dst != p)
1da177e4 LT	192	continue;
1da177e4 LT	193
1a620698 SH	194	if (f->is_static && !do_all)
1a620698 SH	195	continue;
1da177e4 LT	196	/*
	197	* if multiple ports all have the same device address
	198	* then when one port is deleted, assign
	199	* the local entry to other port
	200	*/
	201	if (f->is_local) {
	202	struct net_bridge_port *op;
	203	list_for_each_entry(op, &br->port_list, list) {
9d6f229f	204	if (op != p &&
6ede2463 SH	205	!compare_ether_addr(op->dev->dev_addr,
6ede2463 SH	206	f->addr.addr)) {
1da177e4 LT	207	f->dst = op;
	208	goto skip_delete;
	209	}
	210	}
	211	}
	212
31e8a49c	213	fdb_delete(br, f);
1da177e4 LT	214	skip_delete: ;
	215	}
	216	}
	217	spin_unlock_bh(&br->hash_lock);
	218	}
	219
eeaf61d8	220	/* No locking or refcounting, assumes caller has rcu_read_lock */
1da177e4 LT	221	struct net_bridge_fdb_entry __br_fdb_get(struct net_bridge br,
	222	const unsigned char *addr)
	223	{
	224	struct hlist_node *h;
	225	struct net_bridge_fdb_entry *fdb;
	226
	227	hlist_for_each_entry_rcu(fdb, h, &br->hash[br_mac_hash(addr)], hlist) {
6ede2463	228	if (!compare_ether_addr(fdb->addr.addr, addr)) {
1da177e4 LT	229	if (unlikely(has_expired(br, fdb)))
	230	break;
	231	return fdb;
	232	}
	233	}
	234
	235	return NULL;
	236	}
	237
da678292 MM	238	#if defined(CONFIG_ATM_LANE) \|\| defined(CONFIG_ATM_LANE_MODULE)
	239	/* Interface used by ATM LANE hook to test
	240	* if an addr is on some other bridge port */
	241	int br_fdb_test_addr(struct net_device dev, unsigned char addr)
1da177e4 LT	242	{
1da177e4 LT	243	struct net_bridge_fdb_entry *fdb;
b5ed54e9	244	struct net_bridge_port *port;
da678292 MM	245	int ret;
da678292 MM	246
1da177e4	247	rcu_read_lock();
b5ed54e9	248	port = br_port_get_rcu(dev);
	249	if (!port)
	250	ret = 0;
	251	else {
	252	fdb = __br_fdb_get(port->br, addr);
	253	ret = fdb && fdb->dst->dev != dev &&
	254	fdb->dst->state == BR_STATE_FORWARDING;
	255	}
1da177e4	256	rcu_read_unlock();
1da177e4	257
da678292	258	return ret;
1da177e4	259	}
da678292	260	#endif /* CONFIG_ATM_LANE */
1da177e4 LT	261
1da177e4 LT	262	/*
9d6f229f	263	* Fill buffer with forwarding table records in
1da177e4 LT	264	* the API format.
	265	*/
	266	int br_fdb_fillbuf(struct net_bridge br, void buf,
	267	unsigned long maxnum, unsigned long skip)
	268	{
	269	struct __fdb_entry *fe = buf;
	270	int i, num = 0;
	271	struct hlist_node *h;
	272	struct net_bridge_fdb_entry *f;
	273
	274	memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
	275
	276	rcu_read_lock();
	277	for (i = 0; i < BR_HASH_SIZE; i++) {
	278	hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
	279	if (num >= maxnum)
	280	goto out;
	281
9d6f229f	282	if (has_expired(br, f))
1da177e4 LT	283	continue;
	284
	285	if (skip) {
	286	--skip;
	287	continue;
	288	}
	289
	290	/* convert from internal format to API */
	291	memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
ae4f8fca SH	292
ae4f8fca SH	293	/* due to ABI compat need to split into hi/lo */
1da177e4	294	fe->port_no = f->dst->port_no;
ae4f8fca SH	295	fe->port_hi = f->dst->port_no >> 8;
ae4f8fca SH	296
1da177e4 LT	297	fe->is_local = f->is_local;
1da177e4 LT	298	if (!f->is_static)
7cd8861a	299	fe->ageing_timer_value = jiffies_to_clock_t(jiffies - f->updated);
1da177e4 LT	300	++fe;
	301	++num;
	302	}
	303	}
	304
	305	out:
	306	rcu_read_unlock();
	307
	308	return num;
	309	}
	310
664de48b	311	static struct net_bridge_fdb_entry fdb_find(struct hlist_head head,
	312	const unsigned char *addr)
	313	{
	314	struct hlist_node *h;
	315	struct net_bridge_fdb_entry *fdb;
	316
	317	hlist_for_each_entry(fdb, h, head, hlist) {
	318	if (!compare_ether_addr(fdb->addr.addr, addr))
	319	return fdb;
	320	}
	321	return NULL;
	322	}
	323
	324	static struct net_bridge_fdb_entry fdb_find_rcu(struct hlist_head head,
	325	const unsigned char *addr)
1da177e4 LT	326	{
	327	struct hlist_node *h;
	328	struct net_bridge_fdb_entry *fdb;
	329
	330	hlist_for_each_entry_rcu(fdb, h, head, hlist) {
6ede2463	331	if (!compare_ether_addr(fdb->addr.addr, addr))
1da177e4 LT	332	return fdb;
	333	}
	334	return NULL;
	335	}
	336
	337	static struct net_bridge_fdb_entry fdb_create(struct hlist_head head,
	338	struct net_bridge_port *source,
03e9b64b	339	const unsigned char *addr)
1da177e4 LT	340	{
	341	struct net_bridge_fdb_entry *fdb;
	342
	343	fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
	344	if (fdb) {
	345	memcpy(fdb->addr.addr, addr, ETH_ALEN);
1da177e4	346	fdb->dst = source;
03e9b64b	347	fdb->is_local = 0;
03e9b64b	348	fdb->is_static = 0;
7cd8861a	349	fdb->updated = fdb->used = jiffies;
1158f762	350	hlist_add_head_rcu(&fdb->hlist, head);
1da177e4 LT	351	}
	352	return fdb;
	353	}
	354
	355	static int fdb_insert(struct net_bridge br, struct net_bridge_port source,
	356	const unsigned char *addr)
	357	{
	358	struct hlist_head *head = &br->hash[br_mac_hash(addr)];
	359	struct net_bridge_fdb_entry *fdb;
	360
	361	if (!is_valid_ether_addr(addr))
	362	return -EINVAL;
	363
	364	fdb = fdb_find(head, addr);
	365	if (fdb) {
9d6f229f	366	/* it is okay to have multiple ports with same
1da177e4 LT	367	* address, just use the first one.
1da177e4 LT	368	*/
9d6f229f	369	if (fdb->is_local)
1da177e4	370	return 0;
28a16c97	371	br_warn(br, "adding interface %s with same address "
1da177e4 LT	372	"as a received packet\n",
1da177e4 LT	373	source->dev->name);
31e8a49c	374	fdb_delete(br, fdb);
9d6f229f	375	}
1da177e4	376
03e9b64b	377	fdb = fdb_create(head, source, addr);
03e9b64b	378	if (!fdb)
1da177e4 LT	379	return -ENOMEM;
1da177e4 LT	380
03e9b64b	381	fdb->is_local = fdb->is_static = 1;
31e8a49c	382	fdb_notify(br, fdb, RTM_NEWNEIGH);
1da177e4 LT	383	return 0;
	384	}
	385
03e9b64b	386	/* Add entry for local address of interface */
1da177e4 LT	387	int br_fdb_insert(struct net_bridge br, struct net_bridge_port source,
	388	const unsigned char *addr)
	389	{
	390	int ret;
	391
	392	spin_lock_bh(&br->hash_lock);
	393	ret = fdb_insert(br, source, addr);
	394	spin_unlock_bh(&br->hash_lock);
	395	return ret;
	396	}
	397
	398	void br_fdb_update(struct net_bridge br, struct net_bridge_port source,
	399	const unsigned char *addr)
	400	{
	401	struct hlist_head *head = &br->hash[br_mac_hash(addr)];
	402	struct net_bridge_fdb_entry *fdb;
	403
	404	/* some users want to always flood. */
	405	if (hold_time(br) == 0)
	406	return;
	407
df1c0b84 SH	408	/* ignore packets unless we are using this port */
	409	if (!(source->state == BR_STATE_LEARNING \|\|
	410	source->state == BR_STATE_FORWARDING))
	411	return;
	412
664de48b	413	fdb = fdb_find_rcu(head, addr);
1da177e4 LT	414	if (likely(fdb)) {
	415	/* attempt to update an entry for a local interface */
	416	if (unlikely(fdb->is_local)) {
9d6f229f	417	if (net_ratelimit())
28a16c97	418	br_warn(br, "received packet on %s with "
	419	"own address as source address\n",
	420	source->dev->name);
1da177e4 LT	421	} else {
	422	/* fastpath: update of existing entry */
	423	fdb->dst = source;
7cd8861a	424	fdb->updated = jiffies;
1da177e4 LT	425	}
1da177e4 LT	426	} else {
f8ae737d	427	spin_lock(&br->hash_lock);
f58ee4e1	428	if (likely(!fdb_find(head, addr))) {
	429	fdb = fdb_create(head, source, addr);
	430	if (fdb)
31e8a49c	431	fdb_notify(br, fdb, RTM_NEWNEIGH);
f58ee4e1	432	}
1da177e4 LT	433	/* else we lose race and someone else inserts
	434	* it first, don't bother updating
	435	*/
f8ae737d	436	spin_unlock(&br->hash_lock);
1da177e4	437	}
1da177e4	438	}
b078f0df	439
	440	static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb)
	441	{
	442	if (fdb->is_local)
	443	return NUD_PERMANENT;
	444	else if (fdb->is_static)
	445	return NUD_NOARP;
	446	else if (has_expired(fdb->dst->br, fdb))
	447	return NUD_STALE;
	448	else
	449	return NUD_REACHABLE;
	450	}
	451
31e8a49c	452	static int fdb_fill_info(struct sk_buff skb, const struct net_bridge br,
b078f0df	453	const struct net_bridge_fdb_entry *fdb,
	454	u32 pid, u32 seq, int type, unsigned int flags)
	455	{
	456	unsigned long now = jiffies;
	457	struct nda_cacheinfo ci;
	458	struct nlmsghdr *nlh;
	459	struct ndmsg *ndm;
	460
	461	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags);
	462	if (nlh == NULL)
	463	return -EMSGSIZE;
	464
b078f0df	465	ndm = nlmsg_data(nlh);
	466	ndm->ndm_family = AF_BRIDGE;
	467	ndm->ndm_pad1 = 0;
	468	ndm->ndm_pad2 = 0;
	469	ndm->ndm_flags = 0;
	470	ndm->ndm_type = 0;
	471	ndm->ndm_ifindex = fdb->dst->dev->ifindex;
	472	ndm->ndm_state = fdb_to_nud(fdb);
	473
	474	NLA_PUT(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr);
	475
	476	ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
	477	ci.ndm_confirmed = 0;
	478	ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
	479	ci.ndm_refcnt = 0;
	480	NLA_PUT(skb, NDA_CACHEINFO, sizeof(ci), &ci);
	481
	482	return nlmsg_end(skb, nlh);
	483
	484	nla_put_failure:
	485	nlmsg_cancel(skb, nlh);
	486	return -EMSGSIZE;
	487	}
	488
	489	static inline size_t fdb_nlmsg_size(void)
	490	{
	491	return NLMSG_ALIGN(sizeof(struct ndmsg))
	492	+ nla_total_size(ETH_ALEN) /* NDA_LLADDR */
	493	+ nla_total_size(sizeof(struct nda_cacheinfo));
	494	}
	495
31e8a49c	496	static void fdb_notify(struct net_bridge *br,
31e8a49c	497	const struct net_bridge_fdb_entry *fdb, int type)
b078f0df	498	{
31e8a49c	499	struct net *net = dev_net(br->dev);
b078f0df	500	struct sk_buff *skb;
	501	int err = -ENOBUFS;
	502
	503	skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
	504	if (skb == NULL)
	505	goto errout;
	506
31e8a49c	507	err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
b078f0df	508	if (err < 0) {
	509	/* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
	510	WARN_ON(err == -EMSGSIZE);
	511	kfree_skb(skb);
	512	goto errout;
	513	}
	514	rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
	515	return;
	516	errout:
	517	if (err < 0)
	518	rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
	519	}
	520
	521	/* Dump information about entries, in response to GETNEIGH */
	522	int br_fdb_dump(struct sk_buff skb, struct netlink_callback cb)
	523	{
	524	struct net *net = sock_net(skb->sk);
	525	struct net_device *dev;
	526	int idx = 0;
	527
	528	rcu_read_lock();
	529	for_each_netdev_rcu(net, dev) {
	530	struct net_bridge *br = netdev_priv(dev);
	531	int i;
	532
	533	if (!(dev->priv_flags & IFF_EBRIDGE))
	534	continue;
	535
	536	for (i = 0; i < BR_HASH_SIZE; i++) {
	537	struct hlist_node *h;
	538	struct net_bridge_fdb_entry *f;
	539
	540	hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
	541	if (idx < cb->args[0])
	542	goto skip;
	543
31e8a49c	544	if (fdb_fill_info(skb, br, f,
b078f0df	545	NETLINK_CB(cb->skb).pid,
	546	cb->nlh->nlmsg_seq,
	547	RTM_NEWNEIGH,
	548	NLM_F_MULTI) < 0)
	549	break;
	550	skip:
	551	++idx;
	552	}
	553	}
	554	}
	555	rcu_read_unlock();
	556
	557	cb->args[0] = idx;
	558
	559	return skb->len;
	560	}
36fd2b63	561
292d1398	562	/* Update (create or replace) forwarding database entry */
36fd2b63	563	static int fdb_add_entry(struct net_bridge_port source, const __u8 addr,
64af1bac	564	__u16 state, __u16 flags)
36fd2b63	565	{
	566	struct net_bridge *br = source->br;
	567	struct hlist_head *head = &br->hash[br_mac_hash(addr)];
	568	struct net_bridge_fdb_entry *fdb;
	569
	570	fdb = fdb_find(head, addr);
64af1bac	571	if (fdb == NULL) {
	572	if (!(flags & NLM_F_CREATE))
	573	return -ENOENT;
36fd2b63	574
64af1bac	575	fdb = fdb_create(head, source, addr);
	576	if (!fdb)
	577	return -ENOMEM;
31e8a49c	578	fdb_notify(br, fdb, RTM_NEWNEIGH);
64af1bac	579	} else {
	580	if (flags & NLM_F_EXCL)
	581	return -EEXIST;
292d1398	582	}
	583
	584	if (fdb_to_nud(fdb) != state) {
	585	if (state & NUD_PERMANENT)
	586	fdb->is_local = fdb->is_static = 1;
	587	else if (state & NUD_NOARP) {
	588	fdb->is_local = 0;
	589	fdb->is_static = 1;
	590	} else
	591	fdb->is_local = fdb->is_static = 0;
64af1bac	592
292d1398	593	fdb->updated = fdb->used = jiffies;
31e8a49c	594	fdb_notify(br, fdb, RTM_NEWNEIGH);
64af1bac	595	}
36fd2b63	596
36fd2b63	597	return 0;
	598	}
	599
	600	/* Add new permanent fdb entry with RTM_NEWNEIGH */
	601	int br_fdb_add(struct sk_buff skb, struct nlmsghdr nlh, void *arg)
	602	{
	603	struct net *net = sock_net(skb->sk);
	604	struct ndmsg *ndm;
	605	struct nlattr *tb[NDA_MAX+1];
	606	struct net_device *dev;
	607	struct net_bridge_port *p;
	608	const __u8 *addr;
	609	int err;
	610
	611	ASSERT_RTNL();
	612	err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
	613	if (err < 0)
	614	return err;
	615
	616	ndm = nlmsg_data(nlh);
	617	if (ndm->ndm_ifindex == 0) {
	618	pr_info("bridge: RTM_NEWNEIGH with invalid ifindex\n");
	619	return -EINVAL;
	620	}
	621
	622	dev = __dev_get_by_index(net, ndm->ndm_ifindex);
	623	if (dev == NULL) {
	624	pr_info("bridge: RTM_NEWNEIGH with unknown ifindex\n");
	625	return -ENODEV;
	626	}
	627
	628	if (!tb[NDA_LLADDR] \|\| nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
	629	pr_info("bridge: RTM_NEWNEIGH with invalid address\n");
	630	return -EINVAL;
	631	}
	632
	633	addr = nla_data(tb[NDA_LLADDR]);
	634	if (!is_valid_ether_addr(addr)) {
	635	pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
	636	return -EINVAL;
	637	}
	638
292d1398	639	if (!(ndm->ndm_state & (NUD_PERMANENT\|NUD_NOARP\|NUD_REACHABLE))) {
	640	pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
	641	return -EINVAL;
	642	}
	643
36fd2b63	644	p = br_port_get_rtnl(dev);
	645	if (p == NULL) {
	646	pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
	647	dev->name);
	648	return -EINVAL;
	649	}
	650
292d1398	651	if (ndm->ndm_flags & NTF_USE) {
	652	rcu_read_lock();
	653	br_fdb_update(p->br, p, addr);
	654	rcu_read_unlock();
	655	} else {
	656	spin_lock_bh(&p->br->hash_lock);
	657	err = fdb_add_entry(p, addr, ndm->ndm_state, nlh->nlmsg_flags);
	658	spin_unlock_bh(&p->br->hash_lock);
	659	}
36fd2b63	660
	661	return err;
	662	}
	663
	664	static int fdb_delete_by_addr(struct net_bridge_port p, const u8 addr)
	665	{
	666	struct net_bridge *br = p->br;
	667	struct hlist_head *head = &br->hash[br_mac_hash(addr)];
	668	struct net_bridge_fdb_entry *fdb;
	669
	670	fdb = fdb_find(head, addr);
	671	if (!fdb)
	672	return -ENOENT;
	673
31e8a49c	674	fdb_delete(p->br, fdb);
36fd2b63	675	return 0;
	676	}
	677
	678	/* Remove neighbor entry with RTM_DELNEIGH */
	679	int br_fdb_delete(struct sk_buff skb, struct nlmsghdr nlh, void *arg)
	680	{
	681	struct net *net = sock_net(skb->sk);
	682	struct ndmsg *ndm;
	683	struct net_bridge_port *p;
	684	struct nlattr *llattr;
	685	const __u8 *addr;
	686	struct net_device *dev;
	687	int err;
	688
	689	ASSERT_RTNL();
	690	if (nlmsg_len(nlh) < sizeof(*ndm))
	691	return -EINVAL;
	692
	693	ndm = nlmsg_data(nlh);
	694	if (ndm->ndm_ifindex == 0) {
	695	pr_info("bridge: RTM_DELNEIGH with invalid ifindex\n");
	696	return -EINVAL;
	697	}
	698
	699	dev = __dev_get_by_index(net, ndm->ndm_ifindex);
	700	if (dev == NULL) {
	701	pr_info("bridge: RTM_DELNEIGH with unknown ifindex\n");
	702	return -ENODEV;
	703	}
	704
	705	llattr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_LLADDR);
	706	if (llattr == NULL \|\| nla_len(llattr) != ETH_ALEN) {
	707	pr_info("bridge: RTM_DELNEIGH with invalid address\n");
	708	return -EINVAL;
	709	}
	710
	711	addr = nla_data(llattr);
	712
	713	p = br_port_get_rtnl(dev);
	714	if (p == NULL) {
	715	pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
	716	dev->name);
	717	return -EINVAL;
	718	}
	719
	720	spin_lock_bh(&p->br->hash_lock);
	721	err = fdb_delete_by_addr(p, addr);
	722	spin_unlock_bh(&p->br->hash_lock);
	723
	724	return err;
	725	}