[PATCH net 5/7] wireguard: device: do not generate ICMP for non-IP packets

[Jason A. Donenfeld]

If skb->protocol doesn't match the actual skb->data header, it's
probably not a good idea to pass it off to icmp{,v6}_ndo_send, which is
expecting to reply to a valid IP packet. So this commit has that early
mismatch case jump to a later error label.

Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Signed-off-by: Jason A. Donenfeld <ja...@zx2c4.com>
---
 drivers/net/wireguard/device.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireguard/device.c b/drivers/net/wireguard/device.c
index cd51a2afa28e..8502e1b083ff 100644
--- a/drivers/net/wireguard/device.c
+++ b/drivers/net/wireguard/device.c
@@ -138,7 +138,7 @@ static netdev_tx_t wg_xmit(struct sk_buff *skb, struct 
net_device *dev)
                else if (skb->protocol == htons(ETH_P_IPV6))
                        net_dbg_ratelimited("%s: No peer has allowed IPs 
matching %pI6\n",
                                            dev->name, &ipv6_hdr(skb)->daddr);
-               goto err;
+               goto err_icmp;
        }
 
        family = READ_ONCE(peer->endpoint.addr.sa_family);
@@ -201,12 +201,13 @@ static netdev_tx_t wg_xmit(struct sk_buff *skb, struct 
net_device *dev)
 
 err_peer:
        wg_peer_put(peer);
-err:
-       ++dev->stats.tx_errors;
+err_icmp:
        if (skb->protocol == htons(ETH_P_IP))
                icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
        else if (skb->protocol == htons(ETH_P_IPV6))
                icmpv6_ndo_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 
0);
+err:
+       ++dev->stats.tx_errors;
        kfree_skb(skb);
        return ret;
 }
-- 
2.30.1