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authorJason A. Donenfeld <Jason@zx2c4.com>2021-02-22 17:25:47 +0100
committerJakub Kicinski <kuba@kernel.org>2021-02-23 15:59:34 -0800
commit99fff5264e7ab06f45b0ad60243475be0a8d0559 (patch)
tree97c1827635df57d08f3fe2b7ff06caa62581eab5
parentwireguard: peer: put frequently used members above cache lines (diff)
downloadwireguard-linux-99fff5264e7ab06f45b0ad60243475be0a8d0559.tar.xz
wireguard-linux-99fff5264e7ab06f45b0ad60243475be0a8d0559.zip
wireguard: device: do not generate ICMP for non-IP packets
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 <Jason@zx2c4.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to '')
-rw-r--r--drivers/net/wireguard/device.c7
1 files 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;
}