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tcp: md5: protects md5sig_info with RCU

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This patch makes sure we use appropriate memory barriers before
publishing tp->md5sig_info, allowing tcp_md5_do_lookup() being used from
tcp_v4_send_reset() without holding socket lock (upcoming patch from
Shawn Lu)

Note we also need to respect rcu grace period before its freeing, since
we can free socket without this grace period thanks to
SLAB_DESTROY_BY_RCU

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Shawn Lu <shawn.lu@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2012-01-31 18:45:40 +00:00
committed by David S. Miller
parent 41de8d4cff
commit a8afca0329
4 changed files with 22 additions and 15 deletions
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2
include/linux/tcp.h
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@@ -463,7 +463,7 @@ struct tcp_sock {
const struct tcp_sock_af_ops *af_specific;
/* TCP MD5 Signature Option information */
struct tcp_md5sig_info *md5sig_info;
struct tcp_md5sig_info __rcu *md5sig_info;
#endif
/* When the cookie options are generated and exchanged, then this