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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Mon, 22 Feb 2021 17:25:47 +0100
Subject: [PATCH] wireguard: device: do not generate ICMP for non-IP packets
commit 99fff5264e7ab06f45b0ad60243475be0a8d0559 upstream.
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>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
drivers/net/wireguard/device.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/drivers/net/wireguard/device.c
+++ b/drivers/net/wireguard/device.c
@@ -138,7 +138,7 @@ static netdev_tx_t wg_xmit(struct sk_buf
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_buf
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;
}
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