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xfrm6: Fix transport header offset in _decode_session6.

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skb->transport_header might not be valid when we do a reverse
decode because the ipv6 tunnel error handlers don't update it
to the inner transport header. This leads to a wrong offset
calculation and to wrong layer 4 informations. We fix this
by using the size of the ipv6 header as the first offset.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert 2014-12-04 09:46:20 +01:00
parent f2a01517f2
commit de3b7a06df
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/xfrm6_policy.c
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@ -130,8 +130,8 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
{
struct flowi6 *fl6 = &fl->u.ip6;
int onlyproto = 0;
u16 offset = skb_network_header_len(skb);
const struct ipv6hdr *hdr = ipv6_hdr(skb);
u16 offset = sizeof(*hdr);
struct ipv6_opt_hdr *exthdr;
const unsigned char *nh = skb_network_header(skb);
u8 nexthdr = nh[IP6CB(skb)->nhoff];