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 | |
| parent | 2925f6c0c7af32720dcbadc586463aeceb6baa22 (diff) | |
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>
| -rw-r--r-- | net/bridge/br_mdb.c | 6 | ||||
| -rw-r--r-- | net/bridge/br_multicast.c | 2 | ||||
| -rw-r--r-- | net/bridge/br_private.h | 1 |
3 files changed, 5 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) { diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index 68e375ac93bd..847b98a1d5e0 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -37,6 +37,7 @@ rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) static void br_multicast_start_querier(struct net_bridge *br); +unsigned int br_mdb_rehash_seq; #if IS_ENABLED(CONFIG_IPV6) static inline int ipv6_is_transient_multicast(const struct in6_addr *addr) @@ -338,6 +339,7 @@ static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, return err; } + br_mdb_rehash_seq++; call_rcu_bh(&mdb->rcu, br_mdb_free); out: diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index ae0a6ec0a702..f95b766c7a98 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -411,6 +411,7 @@ extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __us /* br_multicast.c */ #ifdef CONFIG_BRIDGE_IGMP_SNOOPING +extern unsigned int br_mdb_rehash_seq; extern int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, struct sk_buff *skb); |