From c5027c9a896fbe05367fb893a274deca5114bfd0 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Thu, 5 Apr 2007 15:54:02 -0700 Subject: [PATCH] [XFRM]: beet: fix IP option encapsulation Beet mode calculates an incorrect value for the transport header location when IP options are present, resulting in encapsulation errors. The correct location is 4 or 8 bytes before the end of the original IP header, depending on whether the pseudo header is padded. Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/ipv4/xfrm4_mode_beet.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/net/ipv4/xfrm4_mode_beet.c b/net/ipv4/xfrm4_mode_beet.c index 89cf59ea7bbe..16efc66a7c3f 100644 --- a/net/ipv4/xfrm4_mode_beet.c +++ b/net/ipv4/xfrm4_mode_beet.c @@ -42,10 +42,9 @@ static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb) skb->nh.raw = skb_push(skb, x->props.header_len + hdrlen); top_iph = skb->nh.iph; - hdrlen = iph->ihl * 4 - optlen; - skb->h.raw += hdrlen; + skb->h.raw += sizeof(*iph) - hdrlen; - memmove(top_iph, iph, hdrlen); + memmove(top_iph, iph, sizeof(*iph)); if (unlikely(optlen)) { struct ip_beet_phdr *ph; -- GitLab