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authorEric Dumazet <edumazet@google.com>2013-02-21 16:18:52 +0400
committerDavid S. Miller <davem@davemloft.net>2013-02-22 03:15:58 +0400
commit08dcdbf6a7b9d14c2302c5bd0c5390ddf122f664 (patch)
treefc1d00005fda323296b93064416d255b81fdab73 /include/net/inet_sock.h
parent0ab8a9f5fa94ac625c1f19acc48db299416c6d49 (diff)
downloadlinux-08dcdbf6a7b9d14c2302c5bd0c5390ddf122f664.tar.xz
ipv6: use a stronger hash for tcp
It looks like its possible to open thousands of TCP IPv6 sessions on a server, all landing in a single slot of TCP hash table. Incoming packets have to lookup sockets in a very long list. We should hash all bits from foreign IPv6 addresses, using a salt and hash mix, not a simple XOR. inet6_ehashfn() can also separately use the ports, instead of xoring them. Reported-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Yuchung Cheng <ycheng@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/inet_sock.h')
-rw-r--r--include/net/inet_sock.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index a4196cbc84ec..7235ae73a1e8 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -203,6 +203,7 @@ static inline void inet_sk_copy_descendant(struct sock *sk_to,
extern int inet_sk_rebuild_header(struct sock *sk);
extern u32 inet_ehash_secret;
+extern u32 ipv6_hash_secret;
extern void build_ehash_secret(void);
static inline unsigned int inet_ehashfn(struct net *net,