Release 4.18 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 <net/switchdev.h>
#include <trace/events/bridge.h>
#include "br_private.h"


static const struct rhashtable_params br_fdb_rht_params = {
	.head_offset = offsetof(struct net_bridge_fdb_entry, rhnode),
	.key_offset = offsetof(struct net_bridge_fdb_entry, key),
	.key_len = sizeof(struct net_bridge_fdb_key),
	.automatic_shrinking = true,
	.locks_mul = 1,
};


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, u16 vid);
static void fdb_notify(struct net_bridge *br,
		       const struct net_bridge_fdb_entry *, int, bool);



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;

	return 0;
}

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39
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void br_fdb_fini(void)
{
	kmem_cache_destroy(br_fdb_cache);
}

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int br_fdb_hash_init(struct net_bridge *br)
{
	return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params);
}

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void br_fdb_hash_fini(struct net_bridge *br)
{
	rhashtable_destroy(&br->fdb_hash_tbl);
}

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/* 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;
}

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2
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27
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static inline int has_expired(const struct net_bridge *br,
				  const struct net_bridge_fdb_entry *fdb)
{
	return !fdb->is_static && !fdb->added_by_external_learn &&
		time_before_eq(fdb->updated + hold_time(br), jiffies);
}

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30
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9
20.45%
3
60.00%
Roopa Prabhu
5
11.36%
1
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44
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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);
}

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static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl,
						 const unsigned char *addr,
						 __u16 vid)
{
	struct net_bridge_fdb_key key;

	WARN_ON_ONCE(!rcu_read_lock_held());

	key.vlan_id = vid;
	memcpy(key.addr.addr, addr, sizeof(key.addr.addr));

	return rhashtable_lookup(tbl, &key, br_fdb_rht_params);
}

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/* requires bridge hash_lock */


static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br,
						const unsigned char *addr,
						__u16 vid)
{
	struct net_bridge_fdb_entry *fdb;

	lockdep_assert_held_once(&br->hash_lock);

	rcu_read_lock();
	fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
	rcu_read_unlock();

	return fdb;
}

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4
6.90%
1
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58
100.00%
4
100.00%



struct net_device *br_fdb_find_port(const struct net_device *br_dev,
				    const unsigned char *addr,
				    __u16 vid)
{
	struct net_bridge_fdb_entry *f;
	struct net_device *dev = NULL;
	struct net_bridge *br;

	ASSERT_RTNL();

	if (!netif_is_bridge_master(br_dev))
		return NULL;

	br = netdev_priv(br_dev);
	rcu_read_lock();
	f = br_fdb_find_rcu(br, addr, vid);
	if (f && f->dst)
		dev = f->dst->dev;
	rcu_read_unlock();

	return dev;
}
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EXPORT_SYMBOL_GPL(br_fdb_find_port);



struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
					     const unsigned char *addr,
					     __u16 vid)
{
	return fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
}

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/* When a static FDB entry is added, the mac address from the entry is
 * added to the bridge private HW address list and all required ports
 * are then updated with the new information.
 * Called under RTNL.
 */


static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr)
{
	int err;
	struct net_bridge_port *p;

	ASSERT_RTNL();

	list_for_each_entry(p, &br->port_list, list) {
		if (!br_promisc_port(p)) {
			err = dev_uc_add(p->dev, addr);
			if (err)
				goto undo;
		}
	}

	return;
undo:
	list_for_each_entry_continue_reverse(p, &br->port_list, list) {
		if (!br_promisc_port(p))
			dev_uc_del(p->dev, addr);
	}
}

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4
4.17%
1
33.33%
Jiri Pirko
1
1.04%
1
33.33%
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96
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100.00%

/* When a static FDB entry is deleted, the HW address from that entry is
 * also removed from the bridge private HW address list and updates all
 * the ports with needed information.
 * Called under RTNL.
 */


static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
{
	struct net_bridge_port *p;

	ASSERT_RTNL();

	list_for_each_entry(p, &br->port_list, list) {
		if (!br_promisc_port(p))
			dev_uc_del(p->dev, addr);
	}
}

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static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f,
		       bool swdev_notify)
{
	trace_fdb_delete(br, f);

	if (f->is_static)
		fdb_del_hw_addr(br, f->key.addr.addr);

	hlist_del_init_rcu(&f->fdb_node);
	rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode,
			       br_fdb_rht_params);
	fdb_notify(br, f, RTM_DELNEIGH, swdev_notify);
	call_rcu(&f->rcu, fdb_rcu_free);
}

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19
21.35%
2
22.22%
Vlad Yasevich
16
17.98%
1
11.11%
Roopa Prabhu
7
7.87%
1
11.11%
Michał Mirosław
6
6.74%
1
11.11%
Petr Machata
5
5.62%
1
11.11%
Jiri Pirko
1
1.12%
1
11.11%
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89
100.00%
9
100.00%

/* Delete a local entry if no other port had the same address. */


static void fdb_delete_local(struct net_bridge *br,
			     const struct net_bridge_port *p,
			     struct net_bridge_fdb_entry *f)
{
	const unsigned char *addr = f->key.addr.addr;
	struct net_bridge_vlan_group *vg;
	const struct net_bridge_vlan *v;
	struct net_bridge_port *op;
	u16 vid = f->key.vlan_id;

	/* Maybe another port has same hw addr? */
	list_for_each_entry(op, &br->port_list, list) {
		vg = nbp_vlan_group(op);
		if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
		    (!vid || br_vlan_find(vg, vid))) {
			f->dst = op;
			f->added_by_user = 0;
			return;
		}
	}

	vg = br_vlan_group(br);
	v = br_vlan_find(vg, vid);
	/* Maybe bridge device has same hw addr? */
	if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
	    (!vid || (v && br_vlan_should_use(v)))) {
		f->dst = NULL;
		f->added_by_user = 0;
		return;
	}

	fdb_delete(br, f, true);
}

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2
40.00%
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2
1.04%
1
20.00%
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193
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5
100.00%



void br_fdb_find_delete_local(struct net_bridge *br,
			      const struct net_bridge_port *p,
			      const unsigned char *addr, u16 vid)
{
	struct net_bridge_fdb_entry *f;

	spin_lock_bh(&br->hash_lock);
	f = br_fdb_find(br, addr, vid);
	if (f && f->is_local && !f->added_by_user && f->dst == p)
		fdb_delete_local(br, p, f);
	spin_unlock_bh(&br->hash_lock);
}

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2.35%
1
50.00%
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85
100.00%
2
100.00%



void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
{
	struct net_bridge_vlan_group *vg;
	struct net_bridge_fdb_entry *f;
	struct net_bridge *br = p->br;
	struct net_bridge_vlan *v;

	spin_lock_bh(&br->hash_lock);
	vg = nbp_vlan_group(p);
	hlist_for_each_entry(f, &br->fdb_list, fdb_node) {
		if (f->dst == p && f->is_local && !f->added_by_user) {
			/* delete old one */
			fdb_delete_local(br, p, f);

			/* if this port has no vlan information
                         * configured, we can safely be done at
                         * this point.
                         */
			if (!vg || !vg->num_vlans)
				goto insert;
		}
	}

insert:
	/* insert new address,  may fail if invalid address or dup. */
	fdb_insert(br, p, newaddr, 0);

	if (!vg || !vg->num_vlans)
		goto done;

	/* Now add entries for every VLAN configured on the port.
         * This function runs under RTNL so the bitmap will not change
         * from under us.
         */
	list_for_each_entry(v, &vg->vlan_list, vlist)
		fdb_insert(br, p, newaddr, v->vid);

done:
	spin_unlock_bh(&br->hash_lock);
}

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45
26.95%
2
15.38%
Toshiaki Makita
36
21.56%
3
23.08%
Stephen Hemminger
23
13.77%
6
46.15%
Vlad Yasevich
10
5.99%
1
7.69%
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167
100.00%
13
100.00%



void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
{
	struct net_bridge_vlan_group *vg;
	struct net_bridge_fdb_entry *f;
	struct net_bridge_vlan *v;

	spin_lock_bh(&br->hash_lock);

	/* If old entry was unassociated with any port, then delete it. */
	f = br_fdb_find(br, br->dev->dev_addr, 0);
	if (f && f->is_local && !f->dst && !f->added_by_user)
		fdb_delete_local(br, NULL, f);

	fdb_insert(br, NULL, newaddr, 0);
	vg = br_vlan_group(br);
	if (!vg || !vg->num_vlans)
		goto out;
	/* Now remove and add entries for every VLAN configured on the
         * bridge.  This function runs under RTNL so the bitmap will not
         * change from under us.
         */
	list_for_each_entry(v, &vg->vlan_list, vlist) {
		if (!br_vlan_should_use(v))
			continue;
		f = br_fdb_find(br, br->dev->dev_addr, v->vid);
		if (f && f->is_local && !f->dst && !f->added_by_user)
			fdb_delete_local(br, NULL, f);
		fdb_insert(br, NULL, newaddr, v->vid);
	}
out:
	spin_unlock_bh(&br->hash_lock);
}

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11.11%
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46
23.12%
4
44.44%
Nikolay Aleksandrov
26
13.07%
2
22.22%
Total
199
100.00%
9
100.00%



void br_fdb_cleanup(struct work_struct *work)
{
	struct net_bridge *br = container_of(work, struct net_bridge,
					     gc_work.work);
	struct net_bridge_fdb_entry *f = NULL;
	unsigned long delay = hold_time(br);
	unsigned long work_delay = delay;
	unsigned long now = jiffies;

	/* this part is tricky, in order to avoid blocking learning and
         * consequently forwarding, we rely on rcu to delete objects with
         * delayed freeing allowing us to continue traversing
         */
	rcu_read_lock();
	hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
		unsigned long this_timer;

		if (f->is_static || f->added_by_external_learn)
			continue;
		this_timer = f->updated + delay;
		if (time_after(this_timer, now)) {
			work_delay = min(work_delay, this_timer - now);
		} else {
			spin_lock_bh(&br->hash_lock);
			if (!hlist_unhashed(&f->fdb_node))
				fdb_delete(br, f, true);
			spin_unlock_bh(&br->hash_lock);
		}
	}
	rcu_read_unlock();

	/* Cleanup minimum 10 milliseconds apart */
	work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10));
	mod_delayed_work(system_long_wq, &br->gc_work, work_delay);
}

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17.03%
5
41.67%
Linus Torvalds (pre-git)
29
15.93%
1
8.33%
Baruch Even
17
9.34%
1
8.33%
Siva Mannem
5
2.75%
1
8.33%
Fabio Checconi
3
1.65%
1
8.33%
Petr Machata
2
1.10%
1
8.33%
Total
182
100.00%
12
100.00%

/* Completely flush all dynamic entries in forwarding database.*/


void br_fdb_flush(struct net_bridge *br)
{
	struct net_bridge_fdb_entry *f;
	struct hlist_node *tmp;

	spin_lock_bh(&br->hash_lock);
	hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
		if (!f->is_static)
			fdb_delete(br, f, true);
	}
	spin_unlock_bh(&br->hash_lock);
}

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12
18.75%
1
25.00%
Petr Machata
2
3.12%
1
25.00%
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64
100.00%
4
100.00%

/* Flush all entries referring to a specific port.
 * if do_all is set also flush static entries
 * if vid is set delete all entries that match the vlan_id
 */


void br_fdb_delete_by_port(struct net_bridge *br,
			   const struct net_bridge_port *p,
			   u16 vid,
			   int do_all)
{
	struct net_bridge_fdb_entry *f;
	struct hlist_node *tmp;

	spin_lock_bh(&br->hash_lock);
	hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
		if (f->dst != p)
			continue;

		if (!do_all)
			if (f->is_static || (vid && f->key.vlan_id != vid))
				continue;

		if (f->is_local)
			fdb_delete_local(br, p, f);
		else
			fdb_delete(br, f, true);
	}
	spin_unlock_bh(&br->hash_lock);
}

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42
35.59%
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10.00%
Stephen Hemminger
37
31.36%
5
50.00%
Nikolay Aleksandrov
34
28.81%
2
20.00%
Toshiaki Makita
3
2.54%
1
10.00%
Petr Machata
2
1.69%
1
10.00%
Total
118
100.00%
10
100.00%

#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_find_rcu(port->br, addr, 0);
		ret = fdb && fdb->dst && fdb->dst->dev != dev &&
			fdb->dst->state == BR_STATE_FORWARDING;
	}
	rcu_read_unlock();

	return ret;
}
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26
27.96%
1
11.11%
Linus Torvalds (pre-git)
11
11.83%
1
11.11%
Jiri Pirko
2
2.15%
1
11.11%
Patrick McHardy
2
2.15%
1
11.11%
Vlad Yasevich
2
2.15%
1
11.11%
Nikolay Aleksandrov
1
1.08%
1
11.11%
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93
100.00%
9
100.00%

#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 net_bridge_fdb_entry *f;
	struct __fdb_entry *fe = buf;
	int num = 0;

	memset(buf, 0, maxnum*sizeof(struct __fdb_entry));

	rcu_read_lock();
	hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
		if (num >= maxnum)
			break;

		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->key.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;
	}
	rcu_read_unlock();

	return num;
}

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110
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7
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63
34.24%
2
18.18%
Nikolay Aleksandrov
10
5.43%
1
9.09%
Eric Dumazet
1
0.54%
1
9.09%
Total
184
100.00%
11
100.00%



static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
					       struct net_bridge_port *source,
					       const unsigned char *addr,
					       __u16 vid,
					       unsigned char is_local,
					       unsigned char is_static)
{
	struct net_bridge_fdb_entry *fdb;

	fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
	if (fdb) {
		memcpy(fdb->key.addr.addr, addr, ETH_ALEN);
		fdb->dst = source;
		fdb->key.vlan_id = vid;
		fdb->is_local = is_local;
		fdb->is_static = is_static;
		fdb->added_by_user = 0;
		fdb->added_by_external_learn = 0;
		fdb->offloaded = 0;
		fdb->updated = fdb->used = jiffies;
		if (rhashtable_lookup_insert_fast(&br->fdb_hash_tbl,
						  &fdb->rhnode,
						  br_fdb_rht_params)) {
			kmem_cache_free(br_fdb_cache, fdb);
			fdb = NULL;
		} else {
			hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list);
		}
	}
	return fdb;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
46
26.59%
1
8.33%
Nikolay Aleksandrov
44
25.43%
1
8.33%
Stephen Hemminger
38
21.97%
4
33.33%
Roopa Prabhu
10
5.78%
1
8.33%
Vlad Yasevich
9
5.20%
1
8.33%
Pavel Emelyanov
8
4.62%
1
8.33%
Scott Feldman
6
3.47%
1
8.33%
Toshiaki Makita
6
3.47%
1
8.33%
Arkadi Sharshevsky
6
3.47%
1
8.33%
Total
173
100.00%
12
100.00%



static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
		  const unsigned char *addr, u16 vid)
{
	struct net_bridge_fdb_entry *fdb;

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

	fdb = br_fdb_find(br, addr, vid);
	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 (addr:%pM, vlan:%u)\n",
		       source ? source->dev->name : br->dev->name, addr, vid);
		fdb_delete(br, fdb, true);
	}

	fdb = fdb_create(br, source, addr, vid, 1, 1);
	if (!fdb)
		return -ENOMEM;

	fdb_add_hw_addr(br, addr);
	fdb_notify(br, fdb, RTM_NEWNEIGH, true);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
111
74.00%
6
35.29%
Vlad Yasevich
13
8.67%
3
17.65%
Roopa Prabhu
9
6.00%
2
11.76%
Hong Zhi Guo
8
5.33%
1
5.88%
Petr Machata
4
2.67%
1
5.88%
Nikolay Aleksandrov
3
2.00%
2
11.76%
Jiri Pirko
1
0.67%
1
5.88%
Hideaki Yoshifuji / 吉藤英明
1
0.67%
1
5.88%
Total
150
100.00%
17
100.00%

/* Add entry for local address of interface */


int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
		  const unsigned char *addr, u16 vid)
{
	int ret;

	spin_lock_bh(&br->hash_lock);
	ret = fdb_insert(br, source, addr, vid);
	spin_unlock_bh(&br->hash_lock);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
46
77.97%
3
60.00%
Linus Torvalds (pre-git)
8
13.56%
1
20.00%
Vlad Yasevich
5
8.47%
1
20.00%
Total
59
100.00%
5
100.00%



void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
		   const unsigned char *addr, u16 vid, bool added_by_user)
{
	struct net_bridge_fdb_entry *fdb;
	bool fdb_modified = false;

	/* 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(&br->fdb_hash_tbl, 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 (addr:%pM, vlan:%u)\n",
					source->dev->name, addr, vid);
		} else {
			unsigned long now = jiffies;

			/* fastpath: update of existing entry */
			if (unlikely(source != fdb->dst)) {
				fdb->dst = source;
				fdb_modified = true;
				/* Take over HW learned entry */
				if (unlikely(fdb->added_by_external_learn))
					fdb->added_by_external_learn = 0;
			}
			if (now != fdb->updated)
				fdb->updated = now;
			if (unlikely(added_by_user))
				fdb->added_by_user = 1;
			if (unlikely(fdb_modified)) {
				trace_br_fdb_update(br, source, addr, vid, added_by_user);
				fdb_notify(br, fdb, RTM_NEWNEIGH, true);
			}
		}
	} else {
		spin_lock(&br->hash_lock);
		fdb = fdb_create(br, source, addr, vid, 0, 0);
		if (fdb) {
			if (unlikely(added_by_user))
				fdb->added_by_user = 1;
			trace_br_fdb_update(br, source, addr, vid,
					    added_by_user);
			fdb_notify(br, fdb, RTM_NEWNEIGH, true);
		}
		/* else  we lose race and someone else inserts
                 * it first, don't bother updating
                 */
		spin_unlock(&br->hash_lock);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
169
53.99%
10
50.00%
Jon Maxwell
38
12.14%
1
5.00%
Roopa Prabhu
37
11.82%
3
15.00%
Toshiaki Makita
30
9.58%
1
5.00%
Arkadi Sharshevsky
16
5.11%
1
5.00%
Nikolay Aleksandrov
12
3.83%
2
10.00%
Vlad Yasevich
7
2.24%
1
5.00%
Petr Machata
4
1.28%
1
5.00%
Total
313
100.00%
20
100.00%



static int fdb_to_nud(const struct net_bridge *br,
		      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(br, fdb))
		return NUD_STALE;
	else
		return NUD_REACHABLE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
48
88.89%
1
50.00%
Roopa Prabhu
6
11.11%
1
50.00%
Total
54
100.00%
2
100.00%



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(br, fdb);

	if (fdb->offloaded)
		ndm->ndm_flags |= NTF_OFFLOADED;
	if (fdb->added_by_external_learn)
		ndm->ndm_flags |= NTF_EXT_LEARNED;

	if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.addr))
		goto nla_put_failure;
	if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
		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;

	if (fdb->key.vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16),
					&fdb->key.vlan_id))
		goto nla_put_failure;

	nlmsg_end(skb, nlh);
	return 0;

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
236
71.30%
3
25.00%
Arkadi Sharshevsky
24
7.25%
1
8.33%
Vlad Yasevich
22
6.65%
1
8.33%
Roopa Prabhu
20
6.04%
2
16.67%
David S. Miller
14
4.23%
1
8.33%
Nikolay Aleksandrov
6
1.81%
1
8.33%
Toshiaki Makita
4
1.21%
1
8.33%
Johannes Berg
3
0.91%
1
8.33%
Eric W. Biedermann
2
0.60%
1
8.33%
Total
331
100.00%
12
100.00%



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(u32)) /* NDA_MASTER */
		+ nla_total_size(sizeof(u16)) /* NDA_VLAN */
		+ nla_total_size(sizeof(struct nda_cacheinfo));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
34
65.38%
1
33.33%
Vlad Yasevich
9
17.31%
1
33.33%
Roopa Prabhu
9
17.31%
1
33.33%
Total
52
100.00%
3
100.00%



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

	if (swdev_notify)
		br_switchdev_fdb_notify(fdb, type);

	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:
	rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
133
90.48%
2
50.00%
Petr Machata
7
4.76%
1
25.00%
Arkadi Sharshevsky
7
4.76%
1
25.00%
Total
147
100.00%
4
100.00%

/* Dump information about entries, in response to GETNEIGH */


int br_fdb_dump(struct sk_buff *skb,
		struct netlink_callback *cb,
		struct net_device *dev,
		struct net_device *filter_dev,
		int *idx)
{
	struct net_bridge *br = netdev_priv(dev);
	struct net_bridge_fdb_entry *f;
	int err = 0;

	if (!(dev->priv_flags & IFF_EBRIDGE))
		return err;

	if (!filter_dev) {
		err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
		if (err < 0)
			return err;
	}

	rcu_read_lock();
	hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
		if (*idx < cb->args[2])
			goto skip;
		if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) {
			if (filter_dev != dev)
				goto skip;
			/* !f->dst is a special case for bridge
                         * It means the MAC belongs to the bridge
                         * Therefore need a little more filtering
                         * we only want to dump the !f->dst case
                         */
			if (f->dst)
				goto skip;
		}
		if (!filter_dev && f->dst)
			goto skip;

		err = fdb_fill_info(skb, br, f,
				    NETLINK_CB(cb->skb).portid,
				    cb->nlh->nlmsg_seq,
				    RTM_NEWNEIGH,
				    NLM_F_MULTI);
		if (err < 0)
			break;
skip:
		*idx += 1;
	}
	rcu_read_unlock();

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
100
44.64%
2
20.00%
Jamal Hadi Salim
44
19.64%
2
20.00%
Hubert Sokolowski
29
12.95%
1
10.00%
Nikolay Aleksandrov
21
9.38%
1
10.00%
Roopa Prabhu
20
8.93%
1
10.00%
MINOURA Makoto / 箕浦 真
6
2.68%
1
10.00%
John Fastabend
3
1.34%
1
10.00%
Eric W. Biedermann
1
0.45%
1
10.00%
Total
224
100.00%
10
100.00%

/* Update (create or replace) forwarding database entry */


static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
			 const __u8 *addr, __u16 state, __u16 flags, __u16 vid)
{
	struct net_bridge_fdb_entry *fdb;
	bool modified = false;

	/* If the port cannot learn allow only local and static entries */
	if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
	    !(source->state == BR_STATE_LEARNING ||
	      source->state == BR_STATE_FORWARDING))
		return -EPERM;

	if (!source && !(state & NUD_PERMANENT)) {
		pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n",
			br->dev->name);
		return -EINVAL;
	}

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

		fdb = fdb_create(br, source, addr, vid, 0, 0);
		if (!fdb)
			return -ENOMEM;

		modified = true;
	} else {
		if (flags & NLM_F_EXCL)
			return -EEXIST;

		if (fdb->dst != source) {
			fdb->dst = source;
			modified = true;
		}
	}

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

		modified = true;
	}
	fdb->added_by_user = 1;

	fdb->used = jiffies;
	if (modified) {
		fdb->updated = jiffies;
		fdb_notify(br, fdb, RTM_NEWNEIGH, true);
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
167
46.39%
5
29.41%
Vlad Yasevich
59
16.39%
2
11.76%
Roopa Prabhu
48
13.33%
3
17.65%
Toshiaki Makita
42
11.67%
2
11.76%
Wilson Kok
36
10.00%
1
5.88%
Jiri Pirko
3
0.83%
1
5.88%
Nikolay Aleksandrov
3
0.83%
2
11.76%
Petr Machata
2
0.56%
1
5.88%
Total
360
100.00%
17
100.00%



static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
			struct net_bridge_port *p, const unsigned char *addr,
			u16 nlh_flags, u16 vid)
{
	int err = 0;

	if (ndm->ndm_flags & NTF_USE) {
		if (!p) {
			pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n",
				br->dev->name);
			return -EINVAL;
		}
		local_bh_disable();
		rcu_read_lock();
		br_fdb_update(br, p, addr, vid, true);
		rcu_read_unlock();
		local_bh_enable();
	} else if (ndm->ndm_flags & NTF_EXT_LEARNED) {
		err = br_fdb_external_learn_add(br, p, addr, vid, true);
	} else {
		spin_lock_bh(&br->hash_lock);
		err = fdb_add_entry(br, p, addr, ndm->ndm_state,
				    nlh_flags, vid);
		spin_unlock_bh(&br->hash_lock);
	}

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
77
47.53%
4
33.33%
Toshiaki Makita
31
19.14%
2
16.67%
Nikolay Aleksandrov
30
18.52%
2
16.67%
John Fastabend
11
6.79%
1
8.33%
Vlad Yasevich
11
6.79%
2
16.67%
Petr Machata
2
1.23%
1
8.33%
Total
162
100.00%
12
100.00%

/* 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 vid, u16 nlh_flags)
{
	struct net_bridge_vlan_group *vg;
	struct net_bridge_port *p = NULL;
	struct net_bridge_vlan *v;
	struct net_bridge *br = NULL;
	int err = 0;

	trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags);

	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;
	}

	if (is_zero_ether_addr(addr)) {
		pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
		return -EINVAL;
	}

	if (dev->priv_flags & IFF_EBRIDGE) {
		br = netdev_priv(dev);
		vg = br_vlan_group(br);
	} else {
		p = br_port_get_rtnl(dev);
		if (!p) {
			pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
				dev->name);
			return -EINVAL;
		}
		br = p->br;
		vg = nbp_vlan_group(p);
	}

	if (vid) {
		v = br_vlan_find(vg, vid);
		if (!v || !br_vlan_should_use(v)) {
			pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
			return -EINVAL;
		}

		/* VID was specified, so use it. */
		err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid);
	} else {
		err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0);
		if (err || !vg || !vg->num_vlans)
			goto out;

		/* We have vlans configured on this port and user didn't
                 * specify a VLAN.  To be nice, add/update entry for every
                 * vlan on this port.
                 */
		list_for_each_entry(v, &vg->vlan_list, vlist) {
			if (!br_vlan_should_use(v))
				continue;
			err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid);
			if (err)
				goto out;
		}
	}

out:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vlad Yasevich
160
47.20%
1
8.33%
Roopa Prabhu
66
19.47%
2
16.67%
Stephen Hemminger
50
14.75%
3
25.00%
Nikolay Aleksandrov
34
10.03%
1
8.33%
Toshiaki Makita
18
5.31%
2
16.67%
John Fastabend
7
2.06%
1
8.33%
Jiri Pirko
3
0.88%
1
8.33%
Wei Yongjun
1
0.29%
1
8.33%
Total
339
100.00%
12
100.00%



static int fdb_delete_by_addr_and_port(struct net_bridge *br,
				       const struct net_bridge_port *p,
				       const u8 *addr, u16 vlan)
{
	struct net_bridge_fdb_entry *fdb;

	fdb = br_fdb_find(br, addr, vlan);
	if (!fdb || fdb->dst != p)
		return -ENOENT;

	fdb_delete(br, fdb, true);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vlad Yasevich
46
67.65%
1
16.67%
Nikolay Aleksandrov
11
16.18%
3
50.00%
Roopa Prabhu
9
13.24%
1
16.67%
Petr Machata
2
2.94%
1
16.67%
Total
68
100.00%
6
100.00%



static int __br_fdb_delete(struct net_bridge *br,
			   const struct net_bridge_port *p,
			   const unsigned char *addr, u16 vid)
{
	int err;

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

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vlad Yasevich
26
42.62%
1
25.00%
Stephen Hemminger
26
42.62%
1
25.00%
Nikolay Aleksandrov
9
14.75%
2
50.00%
Total
61
100.00%
4
100.00%

/* Remove neighbor entry with RTM_DELNEIGH */


int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
		  struct net_device *dev,
		  const unsigned char *addr, u16 vid)
{
	struct net_bridge_vlan_group *vg;
	struct net_bridge_port *p = NULL;
	struct net_bridge_vlan *v;
	struct net_bridge *br;
	int err;

	if (dev->priv_flags & IFF_EBRIDGE) {
		br = netdev_priv(dev);
		vg = br_vlan_group(br);
	} else {
		p = br_port_get_rtnl(dev);
		if (!p) {
			pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
				dev->name);
			return -EINVAL;
		}
		vg = nbp_vlan_group(p);
		br = p->br;
	}

	if (vid) {
		v = br_vlan_find(vg, vid);
		if (!v) {
			pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
			return -EINVAL;
		}

		err = __br_fdb_delete(br, p, addr, vid);
	} else {
		err = -ENOENT;
		err &= __br_fdb_delete(br, p, addr, 0);
		if (!vg || !vg->num_vlans)
			return err;

		list_for_each_entry(v, &vg->vlan_list, vlist) {
			if (!br_vlan_should_use(v))
				continue;
			err &= __br_fdb_delete(br, p, addr, v->vid);
		}
	}

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vlad Yasevich
130
53.50%
1
14.29%
Roopa Prabhu
52
21.40%
1
14.29%
Nikolay Aleksandrov
48
19.75%
2
28.57%
Toshiaki Makita
9
3.70%
1
14.29%
Jiri Pirko
3
1.23%
1
14.29%
Wei Yongjun
1
0.41%
1
14.29%
Total
243
100.00%
7
100.00%



int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
{
	struct net_bridge_fdb_entry *f, *tmp;
	int err = 0;

	ASSERT_RTNL();

	/* the key here is that static entries change only under rtnl */
	rcu_read_lock();
	hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
		/* We only care for static entries */
		if (!f->is_static)
			continue;
		err = dev_uc_add(p->dev, f->key.addr.addr);
		if (err)
			goto rollback;
	}
done:
	rcu_read_unlock();

	return err;

rollback:
	hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) {
		/* We only care for static entries */
		if (!tmp->is_static)
			continue;
		if (tmp == f)
			break;
		dev_uc_del(p->dev, tmp->key.addr.addr);
	}

	goto done;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vlad Yasevich
96
72.73%
1
33.33%
Nikolay Aleksandrov
34
25.76%
1
33.33%
Geert Uytterhoeven
2
1.52%
1
33.33%
Total
132
100.00%
3
100.00%



void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
{
	struct net_bridge_fdb_entry *f;

	ASSERT_RTNL();

	rcu_read_lock();
	hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
		/* We only care for static entries */
		if (!f->is_static)
			continue;

		dev_uc_del(p->dev, f->key.addr.addr);
	}
	rcu_read_unlock();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vlad Yasevich
49
77.78%
1
50.00%
Nikolay Aleksandrov
14
22.22%
1
50.00%
Total
63
100.00%
2
100.00%



int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
			      const unsigned char *addr, u16 vid,
			      bool swdev_notify)
{
	struct net_bridge_fdb_entry *fdb;
	bool modified = false;
	int err = 0;

	trace_br_fdb_external_learn_add(br, p, addr, vid);

	spin_lock_bh(&br->hash_lock);

	fdb = br_fdb_find(br, addr, vid);
	if (!fdb) {
		fdb = fdb_create(br, p, addr, vid, 0, 0);
		if (!fdb) {
			err = -ENOMEM;
			goto err_unlock;
		}
		fdb->added_by_external_learn = 1;
		fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
	} else {
		fdb->updated = jiffies;

		if (fdb->dst != p) {
			fdb->dst = p;
			modified = true;
		}

		if (fdb->added_by_external_learn) {
			/* Refresh entry */
			fdb->used = jiffies;
		} else if (!fdb->added_by_user) {
			/* Take over SW learned entry */
			fdb->added_by_external_learn = 1;
			modified = true;
		}

		if (modified)
			fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
	}

err_unlock:
	spin_unlock_bh(&br->hash_lock);

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Scott Feldman
149
67.42%
1
12.50%
Nikolay Aleksandrov
43
19.46%
3
37.50%
Roopa Prabhu
15
6.79%
2
25.00%
Petr Machata
7
3.17%
1
12.50%
Jiri Pirko
7
3.17%
1
12.50%
Total
221
100.00%
8
100.00%



int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
			      const unsigned char *addr, u16 vid,
			      bool swdev_notify)
{
	struct net_bridge_fdb_entry *fdb;
	int err = 0;

	spin_lock_bh(&br->hash_lock);

	fdb = br_fdb_find(br, addr, vid);
	if (fdb && fdb->added_by_external_learn)
		fdb_delete(br, fdb, swdev_notify);
	else
		err = -ENOENT;

	spin_unlock_bh(&br->hash_lock);

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Scott Feldman
76
84.44%
1
25.00%
Jiri Pirko
7
7.78%
1
25.00%
Petr Machata
5
5.56%
1
25.00%
Nikolay Aleksandrov
2
2.22%
1
25.00%
Total
90
100.00%
4
100.00%



void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
			  const unsigned char *addr, u16 vid)
{
	struct net_bridge_fdb_entry *fdb;

	spin_lock_bh(&br->hash_lock);

	fdb = br_fdb_find(br, addr, vid);
	if (fdb)
		fdb->offloaded = 1;

	spin_unlock_bh(&br->hash_lock);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Arkadi Sharshevsky
66
100.00%
1
100.00%
Total
66
100.00%
1
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
1750
32.06%
35
29.66%
Vlad Yasevich
888
16.27%
5
4.24%
Nikolay Aleksandrov
858
15.72%
12
10.17%
Toshiaki Makita
449
8.22%
10
8.47%
Roopa Prabhu
316
5.79%
9
7.63%
Linus Torvalds (pre-git)
313
5.73%
3
2.54%
Scott Feldman
234
4.29%
2
1.69%
Petr Machata
149
2.73%
3
2.54%
Arkadi Sharshevsky
119
2.18%
3
2.54%
Michał Mirosław
74
1.36%
1
0.85%
Jamal Hadi Salim
44
0.81%
2
1.69%
Jon Maxwell
38
0.70%
1
0.85%
Wilson Kok
36
0.66%
1
0.85%
Jiri Pirko
29
0.53%
4
3.39%
Hubert Sokolowski
29
0.53%
1
0.85%
John Fastabend
21
0.38%
1
0.85%
Baruch Even
17
0.31%
1
0.85%
David S. Miller
17
0.31%
2
1.69%
Akinobu Mita
13
0.24%
1
0.85%
Hong Zhi Guo
8
0.15%
1
0.85%
Pavel Emelyanov
8
0.15%
1
0.85%
MINOURA Makoto / 箕浦 真
6
0.11%
1
0.85%
Siva Mannem
5
0.09%
1
0.85%
Li RongQing
4
0.07%
1
0.85%
Américo Wang
4
0.07%
1
0.85%
Franck Bui-Huu
3
0.05%
1
0.85%
Tejun Heo
3
0.05%
1
0.85%
Johannes Berg
3
0.05%
1
0.85%
Eric W. Biedermann
3
0.05%
1
0.85%
Fabio Checconi
3
0.05%
1
0.85%
Christoph Lameter
2
0.04%
1
0.85%
Hideaki Yoshifuji / 吉藤英明
2
0.04%
1
0.85%
Wei Yongjun
2
0.04%
1
0.85%
Geert Uytterhoeven
2
0.04%
1
0.85%
Eric Dumazet
2
0.04%
2
1.69%
Patrick McHardy
2
0.04%
1
0.85%
Adrian Bunk
1
0.02%
1
0.85%
Igor Maravić
1
0.02%
1
0.85%
Arun Sharma
1
0.02%
1
0.85%
Total
5459
100.00%
118
100.00%
Directory: net/bridge

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