net: sit: implement header_ops->parse_protocol for AF_PACKET

Sit uses skb->protocol to determine packet type, and bails out if it's
not set. For AF_PACKET injection, we need to support its call chain of:

    packet_sendmsg -> packet_snd -> packet_parse_headers ->
      dev_parse_header_protocol -> parse_protocol

Without a valid parse_protocol, this returns zero, and sit rejects the
skb. So, this wires up the ip_tunnel handler for layer 3 packets for
that case.

Reported-by: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 1fbb4dfbb191bb82b7a8b32c11e74824533b08b2..5e2c34c0ac973643f2fdffee0e9c2d1214922425 100644 (file)
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1421,6 +1421,7 @@ static void ipip6_tunnel_setup(struct net_device *dev)
        int t_hlen = tunnel->hlen + sizeof(struct iphdr);
 
        dev->netdev_ops         = &ipip6_netdev_ops;
+       dev->header_ops         = &ip_tunnel_header_ops;
        dev->needs_free_netdev  = true;
        dev->priv_destructor    = ipip6_dev_free;