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wireguard: device: use icmp_ndo_send helper 

Because wireguard is calling icmp from network device context, it should
use the ndo helper so that the rate limiting applies correctly.  This
commit adds a small test to the wireguard test suite to ensure that the
new functions continue doing the right thing in the context of
wireguard. It does this by setting up a condition that will definately
evoke an icmp error message from the driver, but along a nat'd path.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason A. Donenfeld 2020-02-11 20:47:08 +01:00 committed by David S. Miller
parent 67c9a7e1e3
commit a12d7f3cbd
2 changed files with 13 additions and 2 deletions
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4
drivers/net/wireguard/device.c
View File

@ -203,9 +203,9 @@ err_peer:
err:
++dev->stats.tx_errors;
if (skb->protocol == htons(ETH_P_IP))
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
else if (skb->protocol == htons(ETH_P_IPV6))
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
icmpv6_ndo_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
kfree_skb(skb);
return ret;
}

11
tools/testing/selftests/wireguard/netns.sh
View File

@ -24,6 +24,7 @@
set -e
exec 3>&1
export LANG=C
export WG_HIDE_KEYS=never
netns0="wg-test-$$-0"
netns1="wg-test-$$-1"
@ -297,7 +298,17 @@ ip1 -4 rule add table main suppress_prefixlength 0
n1 ping -W 1 -c 100 -f 192.168.99.7
n1 ping -W 1 -c 100 -f abab::1111
# Have ns2 NAT into wg0 packets from ns0, but return an icmp error along the right route.
n2 iptables -t nat -A POSTROUTING -s 10.0.0.0/24 -d 192.168.241.0/24 -j SNAT --to 192.168.241.2
n0 iptables -t filter -A INPUT \! -s 10.0.0.0/24 -i vethrs -j DROP # Manual rpfilter just to be explicit.
n2 bash -c 'printf 1 > /proc/sys/net/ipv4/ip_forward'
ip0 -4 route add 192.168.241.1 via 10.0.0.100
n2 wg set wg0 peer "$pub1" remove
[[ $(! n0 ping -W 1 -c 1 192.168.241.1 || false) == *"From 10.0.0.100 icmp_seq=1 Destination Host Unreachable"* ]]
n0 iptables -t nat -F
n0 iptables -t filter -F
n2 iptables -t nat -F
ip0 link del vethrc
ip0 link del vethrs
ip1 link del wg0