netdev - Re: [PATCH] xfrm: Accept ESP packets regardless of UDP encapsulation mode

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Date:	Fri, 19 Dec 2008 11:00:45 +0100
From:	Martin Willi <martin@...ongswan.org>
To:	David Miller <davem@...emloft.net>
Cc:	herbert@...dor.apana.org.au, netdev@...r.kernel.org,
	sbergman@...hut.fi
Subject: Re: [PATCH] xfrm: Accept ESP packets regardless of UDP  encapsulation mode

> I'm going to revert the change from net-next-2.6 from now

Yes, I'm fine with that.

> 3) Martin can apply the change locally to do testing until we
>    work this stuff out.

I'll do some testing with a modified patch that accepts encapsulated
packets on a non-encapsulating SA, but not vice-versa. This should solve
that specific issue without introducing that (and hopefully no other)
regression.

diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 7527940..ffc32f5 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -166,7 +166,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
 			goto drop_unlock;
 		}
 
-		if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
+		if (x->encap && x->encap->encap_type != encap_type) {
 			XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH);
 			goto drop_unlock;
 		}
-- 
1.5.6.3




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