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1379 lines
34 KiB
1379 lines
34 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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* Forwarding database |
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* Linux ethernet bridge |
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* |
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* Authors: |
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* Lennert Buytenhek <[email protected]> |
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*/ |
|
|
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/rculist.h> |
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#include <linux/spinlock.h> |
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#include <linux/times.h> |
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#include <linux/netdevice.h> |
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#include <linux/etherdevice.h> |
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#include <linux/jhash.h> |
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#include <linux/random.h> |
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#include <linux/slab.h> |
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#include <linux/atomic.h> |
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#include <asm/unaligned.h> |
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#include <linux/if_vlan.h> |
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#include <net/switchdev.h> |
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#include <trace/events/bridge.h> |
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#include "br_private.h" |
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|
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static const struct rhashtable_params br_fdb_rht_params = { |
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.head_offset = offsetof(struct net_bridge_fdb_entry, rhnode), |
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.key_offset = offsetof(struct net_bridge_fdb_entry, key), |
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.key_len = sizeof(struct net_bridge_fdb_key), |
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.automatic_shrinking = true, |
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}; |
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|
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static struct kmem_cache *br_fdb_cache __read_mostly; |
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static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, |
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const unsigned char *addr, u16 vid); |
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static void fdb_notify(struct net_bridge *br, |
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const struct net_bridge_fdb_entry *, int, bool); |
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|
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int __init br_fdb_init(void) |
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{ |
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br_fdb_cache = kmem_cache_create("bridge_fdb_cache", |
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sizeof(struct net_bridge_fdb_entry), |
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0, |
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SLAB_HWCACHE_ALIGN, NULL); |
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if (!br_fdb_cache) |
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return -ENOMEM; |
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|
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return 0; |
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} |
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|
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void br_fdb_fini(void) |
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{ |
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kmem_cache_destroy(br_fdb_cache); |
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} |
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|
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int br_fdb_hash_init(struct net_bridge *br) |
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{ |
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return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params); |
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} |
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|
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void br_fdb_hash_fini(struct net_bridge *br) |
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{ |
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rhashtable_destroy(&br->fdb_hash_tbl); |
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} |
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|
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/* if topology_changing then use forward_delay (default 15 sec) |
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* otherwise keep longer (default 5 minutes) |
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*/ |
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static inline unsigned long hold_time(const struct net_bridge *br) |
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{ |
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return br->topology_change ? br->forward_delay : br->ageing_time; |
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} |
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|
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static inline int has_expired(const struct net_bridge *br, |
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const struct net_bridge_fdb_entry *fdb) |
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{ |
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return !test_bit(BR_FDB_STATIC, &fdb->flags) && |
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!test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags) && |
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time_before_eq(fdb->updated + hold_time(br), jiffies); |
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} |
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|
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static void fdb_rcu_free(struct rcu_head *head) |
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{ |
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struct net_bridge_fdb_entry *ent |
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= container_of(head, struct net_bridge_fdb_entry, rcu); |
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kmem_cache_free(br_fdb_cache, ent); |
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} |
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|
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static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl, |
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const unsigned char *addr, |
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__u16 vid) |
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{ |
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struct net_bridge_fdb_key key; |
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|
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WARN_ON_ONCE(!rcu_read_lock_held()); |
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|
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key.vlan_id = vid; |
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memcpy(key.addr.addr, addr, sizeof(key.addr.addr)); |
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|
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return rhashtable_lookup(tbl, &key, br_fdb_rht_params); |
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} |
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|
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/* requires bridge hash_lock */ |
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static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br, |
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const unsigned char *addr, |
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__u16 vid) |
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{ |
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struct net_bridge_fdb_entry *fdb; |
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|
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lockdep_assert_held_once(&br->hash_lock); |
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|
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rcu_read_lock(); |
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fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid); |
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rcu_read_unlock(); |
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|
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return fdb; |
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} |
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|
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struct net_device *br_fdb_find_port(const struct net_device *br_dev, |
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const unsigned char *addr, |
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__u16 vid) |
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{ |
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struct net_bridge_fdb_entry *f; |
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struct net_device *dev = NULL; |
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struct net_bridge *br; |
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|
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ASSERT_RTNL(); |
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|
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if (!netif_is_bridge_master(br_dev)) |
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return NULL; |
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|
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br = netdev_priv(br_dev); |
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rcu_read_lock(); |
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f = br_fdb_find_rcu(br, addr, vid); |
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if (f && f->dst) |
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dev = f->dst->dev; |
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rcu_read_unlock(); |
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|
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return dev; |
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} |
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EXPORT_SYMBOL_GPL(br_fdb_find_port); |
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|
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struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, |
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const unsigned char *addr, |
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__u16 vid) |
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{ |
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return fdb_find_rcu(&br->fdb_hash_tbl, addr, vid); |
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} |
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|
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/* When a static FDB entry is added, the mac address from the entry is |
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* added to the bridge private HW address list and all required ports |
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* are then updated with the new information. |
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* Called under RTNL. |
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*/ |
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static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr) |
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{ |
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int err; |
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struct net_bridge_port *p; |
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|
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ASSERT_RTNL(); |
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|
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list_for_each_entry(p, &br->port_list, list) { |
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if (!br_promisc_port(p)) { |
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err = dev_uc_add(p->dev, addr); |
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if (err) |
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goto undo; |
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} |
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} |
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|
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return; |
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undo: |
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list_for_each_entry_continue_reverse(p, &br->port_list, list) { |
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if (!br_promisc_port(p)) |
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dev_uc_del(p->dev, addr); |
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} |
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} |
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|
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/* When a static FDB entry is deleted, the HW address from that entry is |
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* also removed from the bridge private HW address list and updates all |
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* the ports with needed information. |
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* Called under RTNL. |
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*/ |
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static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr) |
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{ |
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struct net_bridge_port *p; |
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|
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ASSERT_RTNL(); |
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|
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list_for_each_entry(p, &br->port_list, list) { |
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if (!br_promisc_port(p)) |
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dev_uc_del(p->dev, addr); |
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} |
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} |
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|
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static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f, |
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bool swdev_notify) |
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{ |
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trace_fdb_delete(br, f); |
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|
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if (test_bit(BR_FDB_STATIC, &f->flags)) |
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fdb_del_hw_addr(br, f->key.addr.addr); |
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|
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hlist_del_init_rcu(&f->fdb_node); |
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rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode, |
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br_fdb_rht_params); |
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fdb_notify(br, f, RTM_DELNEIGH, swdev_notify); |
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call_rcu(&f->rcu, fdb_rcu_free); |
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} |
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|
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/* Delete a local entry if no other port had the same address. */ |
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static void fdb_delete_local(struct net_bridge *br, |
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const struct net_bridge_port *p, |
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struct net_bridge_fdb_entry *f) |
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{ |
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const unsigned char *addr = f->key.addr.addr; |
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struct net_bridge_vlan_group *vg; |
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const struct net_bridge_vlan *v; |
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struct net_bridge_port *op; |
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u16 vid = f->key.vlan_id; |
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|
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/* Maybe another port has same hw addr? */ |
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list_for_each_entry(op, &br->port_list, list) { |
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vg = nbp_vlan_group(op); |
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if (op != p && ether_addr_equal(op->dev->dev_addr, addr) && |
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(!vid || br_vlan_find(vg, vid))) { |
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f->dst = op; |
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clear_bit(BR_FDB_ADDED_BY_USER, &f->flags); |
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return; |
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} |
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} |
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|
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vg = br_vlan_group(br); |
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v = br_vlan_find(vg, vid); |
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/* Maybe bridge device has same hw addr? */ |
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if (p && ether_addr_equal(br->dev->dev_addr, addr) && |
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(!vid || (v && br_vlan_should_use(v)))) { |
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f->dst = NULL; |
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clear_bit(BR_FDB_ADDED_BY_USER, &f->flags); |
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return; |
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} |
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|
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fdb_delete(br, f, true); |
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} |
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|
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void br_fdb_find_delete_local(struct net_bridge *br, |
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const struct net_bridge_port *p, |
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const unsigned char *addr, u16 vid) |
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{ |
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struct net_bridge_fdb_entry *f; |
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|
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spin_lock_bh(&br->hash_lock); |
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f = br_fdb_find(br, addr, vid); |
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if (f && test_bit(BR_FDB_LOCAL, &f->flags) && |
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!test_bit(BR_FDB_ADDED_BY_USER, &f->flags) && f->dst == p) |
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fdb_delete_local(br, p, f); |
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spin_unlock_bh(&br->hash_lock); |
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} |
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|
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void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr) |
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{ |
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struct net_bridge_vlan_group *vg; |
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struct net_bridge_fdb_entry *f; |
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struct net_bridge *br = p->br; |
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struct net_bridge_vlan *v; |
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|
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spin_lock_bh(&br->hash_lock); |
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vg = nbp_vlan_group(p); |
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hlist_for_each_entry(f, &br->fdb_list, fdb_node) { |
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if (f->dst == p && test_bit(BR_FDB_LOCAL, &f->flags) && |
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!test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) { |
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/* delete old one */ |
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fdb_delete_local(br, p, f); |
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|
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/* if this port has no vlan information |
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* configured, we can safely be done at |
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* this point. |
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*/ |
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if (!vg || !vg->num_vlans) |
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goto insert; |
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} |
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} |
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insert: |
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/* insert new address, may fail if invalid address or dup. */ |
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fdb_insert(br, p, newaddr, 0); |
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|
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if (!vg || !vg->num_vlans) |
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goto done; |
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|
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/* Now add entries for every VLAN configured on the port. |
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* This function runs under RTNL so the bitmap will not change |
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* from under us. |
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*/ |
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list_for_each_entry(v, &vg->vlan_list, vlist) |
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fdb_insert(br, p, newaddr, v->vid); |
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|
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done: |
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spin_unlock_bh(&br->hash_lock); |
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} |
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|
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void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) |
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{ |
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struct net_bridge_vlan_group *vg; |
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struct net_bridge_fdb_entry *f; |
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struct net_bridge_vlan *v; |
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spin_lock_bh(&br->hash_lock); |
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|
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/* If old entry was unassociated with any port, then delete it. */ |
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f = br_fdb_find(br, br->dev->dev_addr, 0); |
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if (f && test_bit(BR_FDB_LOCAL, &f->flags) && |
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!f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) |
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fdb_delete_local(br, NULL, f); |
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|
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fdb_insert(br, NULL, newaddr, 0); |
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vg = br_vlan_group(br); |
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if (!vg || !vg->num_vlans) |
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goto out; |
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/* Now remove and add entries for every VLAN configured on the |
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* bridge. This function runs under RTNL so the bitmap will not |
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* change from under us. |
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*/ |
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list_for_each_entry(v, &vg->vlan_list, vlist) { |
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if (!br_vlan_should_use(v)) |
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continue; |
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f = br_fdb_find(br, br->dev->dev_addr, v->vid); |
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if (f && test_bit(BR_FDB_LOCAL, &f->flags) && |
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!f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) |
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fdb_delete_local(br, NULL, f); |
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fdb_insert(br, NULL, newaddr, v->vid); |
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} |
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out: |
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spin_unlock_bh(&br->hash_lock); |
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} |
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|
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void br_fdb_cleanup(struct work_struct *work) |
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{ |
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struct net_bridge *br = container_of(work, struct net_bridge, |
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gc_work.work); |
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struct net_bridge_fdb_entry *f = NULL; |
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unsigned long delay = hold_time(br); |
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unsigned long work_delay = delay; |
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unsigned long now = jiffies; |
|
|
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/* this part is tricky, in order to avoid blocking learning and |
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* consequently forwarding, we rely on rcu to delete objects with |
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* delayed freeing allowing us to continue traversing |
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*/ |
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rcu_read_lock(); |
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hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { |
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unsigned long this_timer = f->updated + delay; |
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|
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if (test_bit(BR_FDB_STATIC, &f->flags) || |
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test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags)) { |
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if (test_bit(BR_FDB_NOTIFY, &f->flags)) { |
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if (time_after(this_timer, now)) |
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work_delay = min(work_delay, |
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this_timer - now); |
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else if (!test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, |
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&f->flags)) |
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fdb_notify(br, f, RTM_NEWNEIGH, false); |
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} |
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continue; |
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} |
|
|
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if (time_after(this_timer, now)) { |
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work_delay = min(work_delay, this_timer - now); |
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} else { |
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spin_lock_bh(&br->hash_lock); |
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if (!hlist_unhashed(&f->fdb_node)) |
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fdb_delete(br, f, true); |
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spin_unlock_bh(&br->hash_lock); |
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} |
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} |
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rcu_read_unlock(); |
|
|
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/* Cleanup minimum 10 milliseconds apart */ |
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work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10)); |
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mod_delayed_work(system_long_wq, &br->gc_work, work_delay); |
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} |
|
|
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/* Completely flush all dynamic entries in forwarding database.*/ |
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void br_fdb_flush(struct net_bridge *br) |
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{ |
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struct net_bridge_fdb_entry *f; |
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struct hlist_node *tmp; |
|
|
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spin_lock_bh(&br->hash_lock); |
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hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) { |
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if (!test_bit(BR_FDB_STATIC, &f->flags)) |
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fdb_delete(br, f, true); |
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} |
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spin_unlock_bh(&br->hash_lock); |
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} |
|
|
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/* Flush all entries referring to a specific port. |
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* if do_all is set also flush static entries |
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* if vid is set delete all entries that match the vlan_id |
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*/ |
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void br_fdb_delete_by_port(struct net_bridge *br, |
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const struct net_bridge_port *p, |
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u16 vid, |
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int do_all) |
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{ |
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struct net_bridge_fdb_entry *f; |
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struct hlist_node *tmp; |
|
|
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spin_lock_bh(&br->hash_lock); |
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hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) { |
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if (f->dst != p) |
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continue; |
|
|
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if (!do_all) |
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if (test_bit(BR_FDB_STATIC, &f->flags) || |
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(test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags) && |
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!test_bit(BR_FDB_OFFLOADED, &f->flags)) || |
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(vid && f->key.vlan_id != vid)) |
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continue; |
|
|
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if (test_bit(BR_FDB_LOCAL, &f->flags)) |
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fdb_delete_local(br, p, f); |
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else |
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fdb_delete(br, f, true); |
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} |
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spin_unlock_bh(&br->hash_lock); |
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} |
|
|
|
#if IS_ENABLED(CONFIG_ATM_LANE) |
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/* Interface used by ATM LANE hook to test |
|
* if an addr is on some other bridge port */ |
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int br_fdb_test_addr(struct net_device *dev, unsigned char *addr) |
|
{ |
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struct net_bridge_fdb_entry *fdb; |
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struct net_bridge_port *port; |
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int ret; |
|
|
|
rcu_read_lock(); |
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port = br_port_get_rcu(dev); |
|
if (!port) |
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ret = 0; |
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else { |
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const struct net_bridge_port *dst = NULL; |
|
|
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fdb = br_fdb_find_rcu(port->br, addr, 0); |
|
if (fdb) |
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dst = READ_ONCE(fdb->dst); |
|
|
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ret = dst && dst->dev != dev && |
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dst->state == BR_STATE_FORWARDING; |
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} |
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rcu_read_unlock(); |
|
|
|
return ret; |
|
} |
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#endif /* CONFIG_ATM_LANE */ |
|
|
|
/* |
|
* Fill buffer with forwarding table records in |
|
* the API format. |
|
*/ |
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int br_fdb_fillbuf(struct net_bridge *br, void *buf, |
|
unsigned long maxnum, unsigned long skip) |
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{ |
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struct net_bridge_fdb_entry *f; |
|
struct __fdb_entry *fe = buf; |
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int num = 0; |
|
|
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memset(buf, 0, maxnum*sizeof(struct __fdb_entry)); |
|
|
|
rcu_read_lock(); |
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hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { |
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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 = test_bit(BR_FDB_LOCAL, &f->flags); |
|
if (!test_bit(BR_FDB_STATIC, &f->flags)) |
|
fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated); |
|
++fe; |
|
++num; |
|
} |
|
rcu_read_unlock(); |
|
|
|
return num; |
|
} |
|
|
|
static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br, |
|
struct net_bridge_port *source, |
|
const unsigned char *addr, |
|
__u16 vid, |
|
unsigned long flags) |
|
{ |
|
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); |
|
WRITE_ONCE(fdb->dst, source); |
|
fdb->key.vlan_id = vid; |
|
fdb->flags = flags; |
|
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; |
|
} |
|
|
|
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 (test_bit(BR_FDB_LOCAL, &fdb->flags)) |
|
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, |
|
BIT(BR_FDB_LOCAL) | BIT(BR_FDB_STATIC)); |
|
if (!fdb) |
|
return -ENOMEM; |
|
|
|
fdb_add_hw_addr(br, addr); |
|
fdb_notify(br, fdb, RTM_NEWNEIGH, true); |
|
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, 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; |
|
} |
|
|
|
/* returns true if the fdb was modified */ |
|
static bool __fdb_mark_active(struct net_bridge_fdb_entry *fdb) |
|
{ |
|
return !!(test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags) && |
|
test_and_clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags)); |
|
} |
|
|
|
void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, |
|
const unsigned char *addr, u16 vid, unsigned long flags) |
|
{ |
|
struct net_bridge_fdb_entry *fdb; |
|
|
|
/* some users want to always flood. */ |
|
if (hold_time(br) == 0) |
|
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(test_bit(BR_FDB_LOCAL, &fdb->flags))) { |
|
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; |
|
bool fdb_modified = false; |
|
|
|
if (now != fdb->updated) { |
|
fdb->updated = now; |
|
fdb_modified = __fdb_mark_active(fdb); |
|
} |
|
|
|
/* fastpath: update of existing entry */ |
|
if (unlikely(source != READ_ONCE(fdb->dst) && |
|
!test_bit(BR_FDB_STICKY, &fdb->flags))) { |
|
br_switchdev_fdb_notify(br, fdb, RTM_DELNEIGH); |
|
WRITE_ONCE(fdb->dst, source); |
|
fdb_modified = true; |
|
/* Take over HW learned entry */ |
|
if (unlikely(test_bit(BR_FDB_ADDED_BY_EXT_LEARN, |
|
&fdb->flags))) |
|
clear_bit(BR_FDB_ADDED_BY_EXT_LEARN, |
|
&fdb->flags); |
|
} |
|
|
|
if (unlikely(test_bit(BR_FDB_ADDED_BY_USER, &flags))) |
|
set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); |
|
if (unlikely(fdb_modified)) { |
|
trace_br_fdb_update(br, source, addr, vid, flags); |
|
fdb_notify(br, fdb, RTM_NEWNEIGH, true); |
|
} |
|
} |
|
} else { |
|
spin_lock(&br->hash_lock); |
|
fdb = fdb_create(br, source, addr, vid, flags); |
|
if (fdb) { |
|
trace_br_fdb_update(br, source, addr, vid, flags); |
|
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); |
|
} |
|
} |
|
|
|
static int fdb_to_nud(const struct net_bridge *br, |
|
const struct net_bridge_fdb_entry *fdb) |
|
{ |
|
if (test_bit(BR_FDB_LOCAL, &fdb->flags)) |
|
return NUD_PERMANENT; |
|
else if (test_bit(BR_FDB_STATIC, &fdb->flags)) |
|
return NUD_NOARP; |
|
else if (has_expired(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) |
|
{ |
|
const struct net_bridge_port *dst = READ_ONCE(fdb->dst); |
|
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 = dst ? dst->dev->ifindex : br->dev->ifindex; |
|
ndm->ndm_state = fdb_to_nud(br, fdb); |
|
|
|
if (test_bit(BR_FDB_OFFLOADED, &fdb->flags)) |
|
ndm->ndm_flags |= NTF_OFFLOADED; |
|
if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) |
|
ndm->ndm_flags |= NTF_EXT_LEARNED; |
|
if (test_bit(BR_FDB_STICKY, &fdb->flags)) |
|
ndm->ndm_flags |= NTF_STICKY; |
|
|
|
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; |
|
|
|
if (test_bit(BR_FDB_NOTIFY, &fdb->flags)) { |
|
struct nlattr *nest = nla_nest_start(skb, NDA_FDB_EXT_ATTRS); |
|
u8 notify_bits = FDB_NOTIFY_BIT; |
|
|
|
if (!nest) |
|
goto nla_put_failure; |
|
if (test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags)) |
|
notify_bits |= FDB_NOTIFY_INACTIVE_BIT; |
|
|
|
if (nla_put_u8(skb, NFEA_ACTIVITY_NOTIFY, notify_bits)) { |
|
nla_nest_cancel(skb, nest); |
|
goto nla_put_failure; |
|
} |
|
|
|
nla_nest_end(skb, nest); |
|
} |
|
|
|
nlmsg_end(skb, nlh); |
|
return 0; |
|
|
|
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(u32)) /* NDA_MASTER */ |
|
+ nla_total_size(sizeof(u16)) /* NDA_VLAN */ |
|
+ nla_total_size(sizeof(struct nda_cacheinfo)) |
|
+ nla_total_size(0) /* NDA_FDB_EXT_ATTRS */ |
|
+ nla_total_size(sizeof(u8)); /* NFEA_ACTIVITY_NOTIFY */ |
|
} |
|
|
|
static int br_fdb_replay_one(struct net_bridge *br, struct notifier_block *nb, |
|
const struct net_bridge_fdb_entry *fdb, |
|
unsigned long action, const void *ctx) |
|
{ |
|
const struct net_bridge_port *p = READ_ONCE(fdb->dst); |
|
struct switchdev_notifier_fdb_info item; |
|
int err; |
|
|
|
item.addr = fdb->key.addr.addr; |
|
item.vid = fdb->key.vlan_id; |
|
item.added_by_user = test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); |
|
item.offloaded = test_bit(BR_FDB_OFFLOADED, &fdb->flags); |
|
item.is_local = test_bit(BR_FDB_LOCAL, &fdb->flags); |
|
item.info.dev = (!p || item.is_local) ? br->dev : p->dev; |
|
item.info.ctx = ctx; |
|
|
|
err = nb->notifier_call(nb, action, &item); |
|
return notifier_to_errno(err); |
|
} |
|
|
|
int br_fdb_replay(const struct net_device *br_dev, const void *ctx, bool adding, |
|
struct notifier_block *nb) |
|
{ |
|
struct net_bridge_fdb_entry *fdb; |
|
struct net_bridge *br; |
|
unsigned long action; |
|
int err = 0; |
|
|
|
if (!nb) |
|
return 0; |
|
|
|
if (!netif_is_bridge_master(br_dev)) |
|
return -EINVAL; |
|
|
|
br = netdev_priv(br_dev); |
|
|
|
if (adding) |
|
action = SWITCHDEV_FDB_ADD_TO_DEVICE; |
|
else |
|
action = SWITCHDEV_FDB_DEL_TO_DEVICE; |
|
|
|
rcu_read_lock(); |
|
|
|
hlist_for_each_entry_rcu(fdb, &br->fdb_list, fdb_node) { |
|
err = br_fdb_replay_one(br, nb, fdb, action, ctx); |
|
if (err) |
|
break; |
|
} |
|
|
|
rcu_read_unlock(); |
|
|
|
return err; |
|
} |
|
|
|
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(br, 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); |
|
} |
|
|
|
/* 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; |
|
} |
|
|
|
int br_fdb_get(struct sk_buff *skb, |
|
struct nlattr *tb[], |
|
struct net_device *dev, |
|
const unsigned char *addr, |
|
u16 vid, u32 portid, u32 seq, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net_bridge *br = netdev_priv(dev); |
|
struct net_bridge_fdb_entry *f; |
|
int err = 0; |
|
|
|
rcu_read_lock(); |
|
f = br_fdb_find_rcu(br, addr, vid); |
|
if (!f) { |
|
NL_SET_ERR_MSG(extack, "Fdb entry not found"); |
|
err = -ENOENT; |
|
goto errout; |
|
} |
|
|
|
err = fdb_fill_info(skb, br, f, portid, seq, |
|
RTM_NEWNEIGH, 0); |
|
errout: |
|
rcu_read_unlock(); |
|
return err; |
|
} |
|
|
|
/* returns true if the fdb is modified */ |
|
static bool fdb_handle_notify(struct net_bridge_fdb_entry *fdb, u8 notify) |
|
{ |
|
bool modified = false; |
|
|
|
/* allow to mark an entry as inactive, usually done on creation */ |
|
if ((notify & FDB_NOTIFY_INACTIVE_BIT) && |
|
!test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags)) |
|
modified = true; |
|
|
|
if ((notify & FDB_NOTIFY_BIT) && |
|
!test_and_set_bit(BR_FDB_NOTIFY, &fdb->flags)) { |
|
/* enabled activity tracking */ |
|
modified = true; |
|
} else if (!(notify & FDB_NOTIFY_BIT) && |
|
test_and_clear_bit(BR_FDB_NOTIFY, &fdb->flags)) { |
|
/* disabled activity tracking, clear notify state */ |
|
clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags); |
|
modified = true; |
|
} |
|
|
|
return modified; |
|
} |
|
|
|
/* Update (create or replace) forwarding database entry */ |
|
static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source, |
|
const u8 *addr, struct ndmsg *ndm, u16 flags, u16 vid, |
|
struct nlattr *nfea_tb[]) |
|
{ |
|
bool is_sticky = !!(ndm->ndm_flags & NTF_STICKY); |
|
bool refresh = !nfea_tb[NFEA_DONT_REFRESH]; |
|
struct net_bridge_fdb_entry *fdb; |
|
u16 state = ndm->ndm_state; |
|
bool modified = false; |
|
u8 notify = 0; |
|
|
|
/* 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; |
|
} |
|
|
|
if (is_sticky && (state & NUD_PERMANENT)) |
|
return -EINVAL; |
|
|
|
if (nfea_tb[NFEA_ACTIVITY_NOTIFY]) { |
|
notify = nla_get_u8(nfea_tb[NFEA_ACTIVITY_NOTIFY]); |
|
if ((notify & ~BR_FDB_NOTIFY_SETTABLE_BITS) || |
|
(notify & BR_FDB_NOTIFY_SETTABLE_BITS) == FDB_NOTIFY_INACTIVE_BIT) |
|
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); |
|
if (!fdb) |
|
return -ENOMEM; |
|
|
|
modified = true; |
|
} else { |
|
if (flags & NLM_F_EXCL) |
|
return -EEXIST; |
|
|
|
if (READ_ONCE(fdb->dst) != source) { |
|
WRITE_ONCE(fdb->dst, source); |
|
modified = true; |
|
} |
|
} |
|
|
|
if (fdb_to_nud(br, fdb) != state) { |
|
if (state & NUD_PERMANENT) { |
|
set_bit(BR_FDB_LOCAL, &fdb->flags); |
|
if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags)) |
|
fdb_add_hw_addr(br, addr); |
|
} else if (state & NUD_NOARP) { |
|
clear_bit(BR_FDB_LOCAL, &fdb->flags); |
|
if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags)) |
|
fdb_add_hw_addr(br, addr); |
|
} else { |
|
clear_bit(BR_FDB_LOCAL, &fdb->flags); |
|
if (test_and_clear_bit(BR_FDB_STATIC, &fdb->flags)) |
|
fdb_del_hw_addr(br, addr); |
|
} |
|
|
|
modified = true; |
|
} |
|
|
|
if (is_sticky != test_bit(BR_FDB_STICKY, &fdb->flags)) { |
|
change_bit(BR_FDB_STICKY, &fdb->flags); |
|
modified = true; |
|
} |
|
|
|
if (fdb_handle_notify(fdb, notify)) |
|
modified = true; |
|
|
|
set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); |
|
|
|
fdb->used = jiffies; |
|
if (modified) { |
|
if (refresh) |
|
fdb->updated = jiffies; |
|
fdb_notify(br, fdb, RTM_NEWNEIGH, true); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
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, struct nlattr *nfea_tb[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
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; |
|
} |
|
if (!nbp_state_should_learn(p)) |
|
return 0; |
|
|
|
local_bh_disable(); |
|
rcu_read_lock(); |
|
br_fdb_update(br, p, addr, vid, BIT(BR_FDB_ADDED_BY_USER)); |
|
rcu_read_unlock(); |
|
local_bh_enable(); |
|
} else if (ndm->ndm_flags & NTF_EXT_LEARNED) { |
|
if (!p && !(ndm->ndm_state & NUD_PERMANENT)) { |
|
NL_SET_ERR_MSG_MOD(extack, |
|
"FDB entry towards bridge must be permanent"); |
|
return -EINVAL; |
|
} |
|
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, nlh_flags, vid, nfea_tb); |
|
spin_unlock_bh(&br->hash_lock); |
|
} |
|
|
|
return err; |
|
} |
|
|
|
static const struct nla_policy br_nda_fdb_pol[NFEA_MAX + 1] = { |
|
[NFEA_ACTIVITY_NOTIFY] = { .type = NLA_U8 }, |
|
[NFEA_DONT_REFRESH] = { .type = NLA_FLAG }, |
|
}; |
|
|
|
/* 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 netlink_ext_ack *extack) |
|
{ |
|
struct nlattr *nfea_tb[NFEA_MAX + 1], *attr; |
|
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 (tb[NDA_FDB_EXT_ATTRS]) { |
|
attr = tb[NDA_FDB_EXT_ATTRS]; |
|
err = nla_parse_nested(nfea_tb, NFEA_MAX, attr, |
|
br_nda_fdb_pol, extack); |
|
if (err) |
|
return err; |
|
} else { |
|
memset(nfea_tb, 0, sizeof(struct nlattr *) * (NFEA_MAX + 1)); |
|
} |
|
|
|
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, nfea_tb, |
|
extack); |
|
} else { |
|
err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0, nfea_tb, |
|
extack); |
|
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, |
|
nfea_tb, extack); |
|
if (err) |
|
goto out; |
|
} |
|
} |
|
|
|
out: |
|
return err; |
|
} |
|
|
|
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 || READ_ONCE(fdb->dst) != p) |
|
return -ENOENT; |
|
|
|
fdb_delete(br, fdb, true); |
|
|
|
return 0; |
|
} |
|
|
|
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; |
|
} |
|
|
|
/* 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; |
|
} |
|
|
|
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 (!test_bit(BR_FDB_STATIC, &f->flags)) |
|
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 (!test_bit(BR_FDB_STATIC, &tmp->flags)) |
|
continue; |
|
if (tmp == f) |
|
break; |
|
dev_uc_del(p->dev, tmp->key.addr.addr); |
|
} |
|
|
|
goto done; |
|
} |
|
|
|
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 (!test_bit(BR_FDB_STATIC, &f->flags)) |
|
continue; |
|
|
|
dev_uc_del(p->dev, f->key.addr.addr); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
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) { |
|
unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN); |
|
|
|
if (swdev_notify) |
|
flags |= BIT(BR_FDB_ADDED_BY_USER); |
|
|
|
if (!p) |
|
flags |= BIT(BR_FDB_LOCAL); |
|
|
|
fdb = fdb_create(br, p, addr, vid, flags); |
|
if (!fdb) { |
|
err = -ENOMEM; |
|
goto err_unlock; |
|
} |
|
fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify); |
|
} else { |
|
fdb->updated = jiffies; |
|
|
|
if (READ_ONCE(fdb->dst) != p) { |
|
WRITE_ONCE(fdb->dst, p); |
|
modified = true; |
|
} |
|
|
|
if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) { |
|
/* Refresh entry */ |
|
fdb->used = jiffies; |
|
} else if (!test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags)) { |
|
/* Take over SW learned entry */ |
|
set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags); |
|
modified = true; |
|
} |
|
|
|
if (swdev_notify) |
|
set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); |
|
|
|
if (!p) |
|
set_bit(BR_FDB_LOCAL, &fdb->flags); |
|
|
|
if (modified) |
|
fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify); |
|
} |
|
|
|
err_unlock: |
|
spin_unlock_bh(&br->hash_lock); |
|
|
|
return err; |
|
} |
|
|
|
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 && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) |
|
fdb_delete(br, fdb, swdev_notify); |
|
else |
|
err = -ENOENT; |
|
|
|
spin_unlock_bh(&br->hash_lock); |
|
|
|
return err; |
|
} |
|
|
|
void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, |
|
const unsigned char *addr, u16 vid, bool offloaded) |
|
{ |
|
struct net_bridge_fdb_entry *fdb; |
|
|
|
spin_lock_bh(&br->hash_lock); |
|
|
|
fdb = br_fdb_find(br, addr, vid); |
|
if (fdb && offloaded != test_bit(BR_FDB_OFFLOADED, &fdb->flags)) |
|
change_bit(BR_FDB_OFFLOADED, &fdb->flags); |
|
|
|
spin_unlock_bh(&br->hash_lock); |
|
} |
|
|
|
void br_fdb_clear_offload(const struct net_device *dev, u16 vid) |
|
{ |
|
struct net_bridge_fdb_entry *f; |
|
struct net_bridge_port *p; |
|
|
|
ASSERT_RTNL(); |
|
|
|
p = br_port_get_rtnl(dev); |
|
if (!p) |
|
return; |
|
|
|
spin_lock_bh(&p->br->hash_lock); |
|
hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) { |
|
if (f->dst == p && f->key.vlan_id == vid) |
|
clear_bit(BR_FDB_OFFLOADED, &f->flags); |
|
} |
|
spin_unlock_bh(&p->br->hash_lock); |
|
} |
|
EXPORT_SYMBOL_GPL(br_fdb_clear_offload);
|
|
|