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authorEric Dumazet <eric.dumazet@gmail.com>2010-06-09 16:21:07 +0000
committerDavid S. Miller <davem@davemloft.net>2010-06-10 22:47:08 -0700
commit592fcb9dfafaa02dd0edc207bf5d3a0ee7a1f8df (patch)
tree3b7bbd5313c7f564cf8087658c36d32a87ca79c4 /include/net/ip.h
parent96b52e61be1ad4d4f8de39b9deaf253da804ea3b (diff)
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ip: ip_ra_control() rcu fix
commit 66018506e15b (ip: Router Alert RCU conversion) introduced RCU lookups to ip_call_ra_chain(). It missed proper deinit phase : When ip_ra_control() deletes an ip_ra_chain, it should make sure ip_call_ra_chain() users can not start to use socket during the rcu grace period. It should also delay the sock_put() after the grace period, or we risk a premature socket freeing and corruptions, as raw sockets are not rcu protected yet. This delay avoids using expensive atomic_inc_not_zero() in ip_call_ra_chain(). Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/ip.h')
-rw-r--r--include/net/ip.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/net/ip.h b/include/net/ip.h
index 9982c97f0bd..d52f0118036 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -61,7 +61,10 @@ struct ipcm_cookie {
struct ip_ra_chain {
struct ip_ra_chain *next;
struct sock *sk;
- void (*destructor)(struct sock *);
+ union {
+ void (*destructor)(struct sock *);
+ struct sock *saved_sk;
+ };
struct rcu_head rcu;
};