target/linux/generic/backport-5.4/080-wireguard-0110-wireguard-implement-header_ops-parse_protocol-for-AF.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: "Jason A. Donenfeld" <Jason@zx2c4.com>
   3 Date: Mon, 29 Jun 2020 19:06:20 -0600
   4 Subject: [PATCH] wireguard: implement header_ops->parse_protocol for AF_PACKET
   5
   6 commit 01a4967c71c004f8ecad4ab57021348636502fa9 upstream.
   7
   8 WireGuard uses skb->protocol to determine packet type, and bails out if
   9 it's not set or set to something it's not expecting. For AF_PACKET
  10 injection, we need to support its call chain of:
  11
  12     packet_sendmsg -> packet_snd -> packet_parse_headers ->
  13       dev_parse_header_protocol -> parse_protocol
  14
  15 Without a valid parse_protocol, this returns zero, and wireguard then
  16 rejects the skb. So, this wires up the ip_tunnel handler for layer 3
  17 packets for that case.
  18
  19 Reported-by: Hans Wippel <ndev@hwipl.net>
  20 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  21 Signed-off-by: David S. Miller <davem@davemloft.net>
  22 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  23 ---
  24  drivers/net/wireguard/device.c | 1 +
  25  1 file changed, 1 insertion(+)
  26
  27 --- a/drivers/net/wireguard/device.c
  28 +++ b/drivers/net/wireguard/device.c
  29 @@ -262,6 +262,7 @@ static void wg_setup(struct net_device *
  30                              max(sizeof(struct ipv6hdr), sizeof(struct iphdr));
  31
  32         dev->netdev_ops = &netdev_ops;
  33 +       dev->header_ops = &ip_tunnel_header_ops;
  34         dev->hard_header_len = 0;
  35         dev->addr_len = 0;
  36         dev->needed_headroom = DATA_PACKET_HEAD_ROOM;