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Diffstat (limited to 'net/ipv4/xfrm4_mode_transport.c')
-rw-r--r--net/ipv4/xfrm4_mode_transport.c14
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;
}