diff options
| author | Cong Wang <amwang@redhat.com> | 2012-12-10 02:15:35 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-12-11 13:44:09 -0500 |
| commit | 2ce297fc24d1f0b70c756d1f593e7a089a2d888d (patch) | |
| tree | c29d8d8f76ff8c8d574e70a9c28aa06a0a4b4211 /net/bridge/br_mdb.c | |
| parent | 2925f6c0c7af32720dcbadc586463aeceb6baa22 (diff) | |
| download | lwn-2ce297fc24d1f0b70c756d1f593e7a089a2d888d.tar.gz lwn-2ce297fc24d1f0b70c756d1f593e7a089a2d888d.zip | |
bridge: fix seq check in br_mdb_dump()
In case of rehashing, introduce a global variable 'br_mdb_rehash_seq'
which gets increased every time when rehashing, and assign
net->dev_base_seq + br_mdb_rehash_seq to cb->seq.
In theory cb->seq could be wrapped to zero, but this is not
easy to fix, as net->dev_base_seq is not visible inside
br_mdb_rehash(). In practice, this is rare.
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Thomas Graf <tgraf@suug.ch>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge/br_mdb.c')
| -rw-r--r-- | net/bridge/br_mdb.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c index edc0d731f6b2..ccc43a9bff80 100644 --- a/net/bridge/br_mdb.c +++ b/net/bridge/br_mdb.c @@ -117,10 +117,8 @@ static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb) rcu_read_lock(); - /* TODO: in case of rehashing, we need to check - * consistency for dumping. - */ - cb->seq = net->dev_base_seq; + /* In theory this could be wrapped to 0... */ + cb->seq = net->dev_base_seq + br_mdb_rehash_seq; for_each_netdev_rcu(net, dev) { if (dev->priv_flags & IFF_EBRIDGE) { |