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authorSteffen Klassert <steffen.klassert@secunet.com>2011-03-28 19:45:52 +0000
committerDavid S. Miller <davem@davemloft.net>2011-03-28 23:34:51 -0700
commit36ae0148dbb6b9e15d8f067bb7523fd2b765a6af (patch)
tree3ce6c552fc83d83beb5a0a35fb85e4f38f3dd251 /net/xfrm
parent72f49050ba18959472aac723cd9d094bc3547e89 (diff)
downloadvexpress-lsk-36ae0148dbb6b9e15d8f067bb7523fd2b765a6af.tar.gz
xfrm: Move the test on replay window size into the replay check functions
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>
Diffstat (limited to 'net/xfrm')
-rw-r--r--net/xfrm/xfrm_input.c2
-rw-r--r--net/xfrm/xfrm_replay.c17
2 files changed, 16 insertions, 3 deletions
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 341cd1189f8..a026b0ef244 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -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;
}
diff --git a/net/xfrm/xfrm_replay.c b/net/xfrm/xfrm_replay.c
index 2f5be5b1574..f218385950c 100644
--- a/net/xfrm/xfrm_replay.c
+++ b/net/xfrm/xfrm_replay.c
@@ -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;