diff options
Diffstat (limited to 'net/ipv4/xfrm4_mode_transport.c')
| -rw-r--r-- | net/ipv4/xfrm4_mode_transport.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/net/ipv4/xfrm4_mode_transport.c b/net/ipv4/xfrm4_mode_transport.c index e46d9a4ccc55..a9e6b3dd19c9 100644 --- a/net/ipv4/xfrm4_mode_transport.c +++ b/net/ipv4/xfrm4_mode_transport.c @@ -38,8 +38,22 @@ static int xfrm4_transport_output(struct sk_buff *skb) return 0; } +/* Remove encapsulation header. + * + * The IP header will be moved over the top of the encapsulation header. + * + * On entry, skb->h shall point to where the IP header should be and skb->nh + * shall be set to where the IP header currently is. skb->data shall point + * to the start of the payload. + */ static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb) { + int ihl = skb->data - skb->h.raw; + + if (skb->h.raw != skb->nh.raw) + skb->nh.raw = memmove(skb->h.raw, skb->nh.raw, ihl); + skb->nh.iph->tot_len = htons(skb->len + ihl); + skb->h.raw = skb->data; return 0; } |