diff options
| author | Eric Dumazet <eric.dumazet@gmail.com> | 2011-08-08 23:44:00 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-15 18:31:37 -0700 |
| commit | ef81bb40bf15f350fe865f31fa42f1082772a576 (patch) | |
| tree | f89c3e9616127d234207a84e108bf147cc393215 /net/ipv6/af_inet6.c | |
| parent | eb473dd5ad8785d35142966cdcd6896d8dff5a22 (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.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index 3b5669a2582d..559123644e5d 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; |