4.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: Lukasz Duda <[email protected]> commit 87f5fedb3bebbbb566f847dd0c567fcea49a36a6 upstream. This patch fixes incorrect handling of the 6lowpan packets that contain uncompressed IPv6 header. RFC4944 specifies a special dispatch for 6lowpan to carry uncompressed IPv6 header. This dispatch (1 byte long) has to be removed during reception and skb data pointer has to be moved. To correctly point in the beginning of the IPv6 header the dispatch byte has to be pulled off before packet can be processed by netif_rx_in(). Test scenario: IPv6 packets are not correctly interpreted by the network layer when IPv6 header is not compressed (e.g. ICMPv6 Echo Reply is not propagated correctly to the ICMPv6 layer because the extra byte will make the header look corrupted). Similar approach is done for IEEE 802.15.4. Signed-off-by: Lukasz Duda <[email protected]> Signed-off-by: Glenn Ruben Bakke <[email protected]> Acked-by: Jukka Rissanen <[email protected]> Signed-off-by: Johan Hedberg <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- net/bluetooth/6lowpan.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/bluetooth/6lowpan.c +++ b/net/bluetooth/6lowpan.c @@ -307,6 +307,9 @@ static int recv_pkt(struct sk_buff *skb, /* check that it's our buffer */ if (lowpan_is_ipv6(*skb_network_header(skb))) { + /* Pull off the 1-byte of 6lowpan header. */ + skb_pull(skb, 1); + /* Copy the packet so that the IPv6 header is * properly aligned. */
