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bridge: make br_fdb_delete also check if the port matches 

Before this patch the user-specified bridge port was ignored when
deleting an fdb entry and thus one could delete an entry that belonged
to any port.
Example (eth0 and eth1 are br0 ports):
bridge fdb add 00:11:22:33:44:55 dev eth0 master
bridge fdb del 00:11:22:33:44:55 dev eth1 master
(succeeds)

after the patch:
bridge fdb add 00:11:22:33:44:55 dev eth0 master
bridge fdb del 00:11:22:33:44:55 dev eth1 master
RTNETLINK answers: No such file or directory

Based on a patch by Wilson Kok.

Reported-by: Wilson Kok <wkok@cumulusnetworks.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2015-06-09 03:34:13 -07:00 committed by David S. Miller
parent 43559893be
commit 8c86f967dd
1 changed files with 5 additions and 3 deletions
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8
net/bridge/br_fdb.c
View File

@ -873,13 +873,15 @@ out:
return err;
}
static int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, u16 vlan)
static int fdb_delete_by_addr_and_port(struct net_bridge_port *p,
const u8 *addr, u16 vlan)
{
struct net_bridge *br = p->br;
struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)];
struct net_bridge_fdb_entry *fdb;
fdb = fdb_find(head, addr, vlan);
if (!fdb)
if (!fdb || fdb->dst != p)
return -ENOENT;
fdb_delete(br, fdb);
@ -892,7 +894,7 @@ static int __br_fdb_delete(struct net_bridge_port *p,
int err;
spin_lock_bh(&p->br->hash_lock);
err = fdb_delete_by_addr(p->br, addr, vid);
err = fdb_delete_by_addr_and_port(p, addr, vid);
spin_unlock_bh(&p->br->hash_lock);
return err;