Commit 01a4967c authored Jun 29, 2020 by Jason A. Donenfeld Committed by David S. Miller Jun 30, 2020

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>

parent e53ac932

drivers/net/wireguard/device.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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;

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