netdev - [PATCH net-2.6 3/4] xfrm: Check for the new replay implementation if an esn state is inserted

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Message-ID: <20110426054121.GH5495@secunet.com>
Date:	Tue, 26 Apr 2011 07:41:21 +0200
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	David Miller <davem@...emloft.net>,
	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	netdev@...r.kernel.org
Subject: [PATCH net-2.6 3/4] xfrm: Check for the new replay implementation
 if an esn state is inserted

IPsec extended sequence numbers can be used only with the new
anti-replay window implementation. So check if the new implementation
is used if an esn state is inserted and return an error if it is not.

Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 net/xfrm/xfrm_user.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 5d1d60d..c658cb3 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -124,6 +124,9 @@ static inline int verify_replay(struct xfrm_usersa_info *p,
 {
 	struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
 
+	if ((p->flags & XFRM_STATE_ESN) && !rt)
+		return -EINVAL;
+
 	if (!rt)
 		return 0;
 
-- 
1.7.0.4

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