6lowpan: Fix fragmentation with link-local compressed addresses

When a new 6lowpan fragment is received, a skbuff is allocated for
the reassembled packet. However when a 6lowpan packet compresses
link-local addresses based on link-layer addresses, the processing
function relies on the skb mac control block to find the related
link-layer address.

This patch copies the control block from the first fragment into
the newly allocated skb to keep a trace of the link-layer addresses
in case of a link-local compressed address.

Edit: small changes on comment issue

Signed-off-by: David Hauweele <david@hauweele.net>
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Reviewed-by: Werner Almesberger <werner@almesberger.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index 92429db0b237..632b3fdf46a4 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -698,6 +698,12 @@ lowpan_alloc_new_frame(struct sk_buff *skb, u16 len, u16 tag)
         skb_reserve(frame->skb, sizeof(struct ipv6hdr));
         skb_put(frame->skb, frame->length);
 
+        /* copy the first control block to keep a
+         * trace of the link-layer addresses in case
+         * of a link-local compressed address
+         */
+        memcpy(frame->skb->cb, skb->cb, sizeof(skb->cb));
+
         init_timer(&frame->timer);
         /* time out is the same as for ipv6 - 60 sec */
         frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT;