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[IPSEC]: Reject packets within replay window but outside the bit mask

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Up until this point we've accepted replay window settings greater than
32 but our bit mask can only accomodate 32 packets.  Thus any packet
with a sequence number within the window but outside the bit mask would
be accepted.

This patch causes those packets to be rejected instead.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2007-04-05 00:07:39 -07:00 committed by David S. Miller
parent 60e5c16641
commit 4c4d51a731
1 changed files with 2 additions and 1 deletions
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3
net/xfrm/xfrm_state.c
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@ -1371,7 +1371,8 @@ int xfrm_replay_check(struct xfrm_state *x, __be32 net_seq)
return 0;
diff = x->replay.seq - seq;
if (diff >= x->props.replay_window) {
if (diff >= min_t(unsigned int, x->props.replay_window,
sizeof(x->replay.bitmap) * 8)) {
x->stats.replay_window++;
return -EINVAL;
}