ipsec: be careful of non existing mac headers

[cascardo/linux.git] / include / linux / skbuff.h

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 50db9b0..ae86ade 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1465,6 +1465,16 @@ static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)
 }
 #endif /* NET_SKBUFF_DATA_USES_OFFSET */
 
+static inline void skb_mac_header_rebuild(struct sk_buff *skb)
+{
+       if (skb_mac_header_was_set(skb)) {
+               const unsigned char *old_mac = skb_mac_header(skb);
+
+               skb_set_mac_header(skb, -skb->mac_len);
+               memmove(skb_mac_header(skb), old_mac, skb->mac_len);
+       }
+}
+
 static inline int skb_checksum_start_offset(const struct sk_buff *skb)
 {
        return skb->csum_start - skb_headroom(skb);