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authorEric Dumazet <eric.dumazet@gmail.com>2011-08-08 23:44:00 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2011-08-15 18:31:37 -0700
commitef81bb40bf15f350fe865f31fa42f1082772a576 (patch)
treef89c3e9616127d234207a84e108bf147cc393215 /net/ipv6/af_inet6.c
parenteb473dd5ad8785d35142966cdcd6896d8dff5a22 (diff)
ipv6: make fragment identifications less predictable
[ Backport of upstream commit 87c48fa3b4630905f98268dde838ee43626a060c ] Fernando Gont reported current IPv6 fragment identification generation was not secure, because using a very predictable system-wide generator, allowing various attacks. IPv4 uses inetpeer cache to address this problem and to get good performance. We'll use this mechanism when IPv6 inetpeer is stable enough in linux-3.1 For the time being, we use jhash on destination address to provide less predictable identifications. Also remove a spinlock and use cmpxchg() to get better SMP performance. Reported-by: Fernando Gont <fernando@gont.com.ar> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'net/ipv6/af_inet6.c')
-rw-r--r--net/ipv6/af_inet6.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 3b5669a2582..559123644e5 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -1078,6 +1078,8 @@ static int __init inet6_init(void)
goto out;
}
+ initialize_hashidentrnd();
+
err = proto_register(&tcpv6_prot, 1);
if (err)
goto out;