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xfrm: Move the test on replay window size into the replay check functions

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As it is, the replay check is just performed if the replay window of the
legacy implementation is nonzero. So we move the test on a nonzero replay
window inside the replay check functions to be sure we are testing for the
right implementation.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steffen Klassert 2011-03-28 19:45:52 +00:00 committed by David S. Miller
parent 72f49050ba
commit 36ae0148db
2 changed files with 16 additions and 3 deletions
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2
net/xfrm/xfrm_input.c
View File

@ -173,7 +173,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
goto drop_unlock;
}
if (x->props.replay_window && x->repl->check(x, skb, seq)) {
if (x->repl->check(x, skb, seq)) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
goto drop_unlock;
}

17
net/xfrm/xfrm_replay.c
View File

@ -118,6 +118,9 @@ static int xfrm_replay_check(struct xfrm_state *x,
u32 diff;
u32 seq = ntohl(net_seq);
if (!x->props.replay_window)
return 0;
if (unlikely(seq == 0))
goto err;
@ -193,9 +196,14 @@ static int xfrm_replay_check_bmp(struct xfrm_state *x,
{
unsigned int bitnr, nr;
struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
u32 pos;
u32 seq = ntohl(net_seq);
u32 diff = replay_esn->seq - seq;
u32 pos = (replay_esn->seq - 1) % replay_esn->replay_window;
if (!replay_esn->replay_window)
return 0;
pos = (replay_esn->seq - 1) % replay_esn->replay_window;
if (unlikely(seq == 0))
goto err;
@ -373,12 +381,17 @@ static int xfrm_replay_check_esn(struct xfrm_state *x,
unsigned int bitnr, nr;
u32 diff;
struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
u32 pos;
u32 seq = ntohl(net_seq);
u32 pos = (replay_esn->seq - 1) % replay_esn->replay_window;
u32 wsize = replay_esn->replay_window;
u32 top = replay_esn->seq;
u32 bottom = top - wsize + 1;
if (!wsize)
return 0;
pos = (replay_esn->seq - 1) % replay_esn->replay_window;
if (unlikely(seq == 0 && replay_esn->seq_hi == 0 &&
(replay_esn->seq < replay_esn->replay_window - 1)))
goto err;