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wireguard: implement header_ops->parse_protocol for AF_PACKET 

WireGuard uses skb->protocol to determine packet type, and bails out if
it's not set or set to something it's not expecting. 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 wireguard then
rejects the skb. So, this wires up the ip_tunnel handler for layer 3
packets for that case.

Reported-by: Hans Wippel <ndev@hwipl.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason A. Donenfeld 2020-06-29 19:06:20 -06:00 committed by David S. Miller
parent e53ac93220
commit 01a4967c71
1 changed files with 1 additions and 0 deletions
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1
drivers/net/wireguard/device.c
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@ -262,6 +262,7 @@ static void wg_setup(struct net_device *dev)
max(sizeof(struct ipv6hdr), sizeof(struct iphdr));
dev->netdev_ops = &netdev_ops;
dev->header_ops = &ip_tunnel_header_ops;
dev->hard_header_len = 0;
dev->addr_len = 0;
dev->needed_headroom = DATA_PACKET_HEAD_ROOM;