target/linux/generic/backport-5.4/080-wireguard-0111-wireguard-implement-header_ops-parse_protocol-for-AF.patch

   1 From cf413ab742788eeb47e789934d492bb546aa4aa8 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 111/124] wireguard: implement header_ops->parse_protocol for
   5  AF_PACKET
   6
   7 commit 01a4967c71c004f8ecad4ab57021348636502fa9 upstream.
   8
   9 WireGuard uses skb->protocol to determine packet type, and bails out if
  10 it's not set or set to something it's not expecting. For AF_PACKET
  11 injection, we need to support its call chain of:
  12
  13     packet_sendmsg -> packet_snd -> packet_parse_headers ->
  14       dev_parse_header_protocol -> parse_protocol
  15
  16 Without a valid parse_protocol, this returns zero, and wireguard then
  17 rejects the skb. So, this wires up the ip_tunnel handler for layer 3
  18 packets for that case.
  19
  20 Reported-by: Hans Wippel <ndev@hwipl.net>
  21 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  22 Signed-off-by: David S. Miller <davem@davemloft.net>
  23 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  24 ---
  25  drivers/net/wireguard/device.c | 1 +
  26  1 file changed, 1 insertion(+)
  27
  28 --- a/drivers/net/wireguard/device.c
  29 +++ b/drivers/net/wireguard/device.c
  30 @@ -262,6 +262,7 @@ static void wg_setup(struct net_device *
  31                              max(sizeof(struct ipv6hdr), sizeof(struct iphdr));
  32
  33         dev->netdev_ops = &netdev_ops;
  34 +       dev->header_ops = &ip_tunnel_header_ops;
  35         dev->hard_header_len = 0;
  36         dev->addr_len = 0;
  37         dev->needed_headroom = DATA_PACKET_HEAD_ROOM;