diff options
author | Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> | 2014-02-07 16:48:18 +0900 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2014-02-10 14:34:33 -0800 |
commit | a5642ab4744bc8c5a8c7ce7c6e30c01bd6bbc691 (patch) | |
tree | 5ede15fbe48d33f5620de09ac5e5514a9ea5bf44 /net/bridge/br_fdb.c | |
parent | b10bd54c05a6c3c96549f4642d7de23c99b9853b (diff) |
bridge: Fix the way to find old local fdb entries in br_fdb_changeaddr
br_fdb_changeaddr() assumes that there is at most one local entry per port
per vlan. It used to be true, but since commit 36fd2b63e3b4 ("bridge: allow
creating/deleting fdb entries via netlink"), it has not been so.
Therefore, the function might fail to search a correct previous address
to be deleted and delete an arbitrary local entry if user has added local
entries manually.
Example of problematic case:
ip link set eth0 address ee:ff:12:34:56:78
brctl addif br0 eth0
bridge fdb add 12:34:56:78:90:ab dev eth0 master
ip link set eth0 address aa:bb:cc:dd:ee:ff
Then, the address 12:34:56:78:90:ab might be deleted instead of
ee:ff:12:34:56:78, the original mac address of eth0.
Address this issue by introducing a new flag, added_by_user, to struct
net_bridge_fdb_entry.
Note that br_fdb_delete_by_port() has to set added_by_user to 0 in cases
like:
ip link set eth0 address 12:34:56:78:90:ab
ip link set eth1 address aa:bb:cc:dd:ee:ff
brctl addif br0 eth0
bridge fdb add aa:bb:cc:dd:ee:ff dev eth0 master
brctl addif br0 eth1
brctl delif br0 eth0
In this case, kernel should delete the user-added entry aa:bb:cc:dd:ee:ff,
but it also should have been added by "brctl addif br0 eth1" originally,
so we don't delete it and treat it a new kernel-created entry.
Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge/br_fdb.c')
-rw-r--r-- | net/bridge/br_fdb.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c index c5f5a4a933f4..ce5411995a63 100644 --- a/net/bridge/br_fdb.c +++ b/net/bridge/br_fdb.c @@ -104,7 +104,7 @@ void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr) struct net_bridge_fdb_entry *f; f = hlist_entry(h, struct net_bridge_fdb_entry, hlist); - if (f->dst == p && f->is_local) { + if (f->dst == p && f->is_local && !f->added_by_user) { /* maybe another port has same hw addr? */ struct net_bridge_port *op; u16 vid = f->vlan_id; @@ -247,6 +247,7 @@ void br_fdb_delete_by_port(struct net_bridge *br, ether_addr_equal(op->dev->dev_addr, f->addr.addr)) { f->dst = op; + f->added_by_user = 0; goto skip_delete; } } @@ -397,6 +398,7 @@ static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head, fdb->vlan_id = vid; fdb->is_local = 0; fdb->is_static = 0; + fdb->added_by_user = 0; fdb->updated = fdb->used = jiffies; hlist_add_head_rcu(&fdb->hlist, head); } @@ -447,7 +449,7 @@ int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, } void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, - const unsigned char *addr, u16 vid) + const unsigned char *addr, u16 vid, bool added_by_user) { struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; struct net_bridge_fdb_entry *fdb; @@ -473,13 +475,18 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, /* fastpath: update of existing entry */ fdb->dst = source; fdb->updated = jiffies; + if (unlikely(added_by_user)) + fdb->added_by_user = 1; } } else { spin_lock(&br->hash_lock); if (likely(!fdb_find(head, addr, vid))) { fdb = fdb_create(head, source, addr, vid); - if (fdb) + if (fdb) { + if (unlikely(added_by_user)) + fdb->added_by_user = 1; fdb_notify(br, fdb, RTM_NEWNEIGH); + } } /* else we lose race and someone else inserts * it first, don't bother updating @@ -647,6 +654,7 @@ static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr, modified = true; } + fdb->added_by_user = 1; fdb->used = jiffies; if (modified) { @@ -664,7 +672,7 @@ static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p, if (ndm->ndm_flags & NTF_USE) { rcu_read_lock(); - br_fdb_update(p->br, p, addr, vid); + br_fdb_update(p->br, p, addr, vid, true); rcu_read_unlock(); } else { spin_lock_bh(&p->br->hash_lock); |