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vxlan: do not receive IPv4 packets on IPv6 socket

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By default (subject to the sysctl settings), IPv6 sockets listen also for
IPv4 traffic. Vxlan is not prepared for that and expects IPv6 header in
packets received through an IPv6 socket.

In addition, it's currently not possible to have both IPv4 and IPv6 vxlan
tunnel on the same port (unless bindv6only sysctl is enabled), as it's not
possible to create and bind both IPv4 and IPv6 vxlan interfaces and there's
no way to specify both IPv4 and IPv6 remote/group IP addresses.

Set IPV6_V6ONLY on vxlan sockets to fix both of these issues. This is not
done globally in udp_tunnel, as l2tp and tipc seems to work okay when
receiving IPv4 packets on IPv6 socket and people may rely on this behavior.
The other tunnels (geneve and fou) do not support IPv6.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Benc 2015-08-28 20:48:22 +02:00 committed by David S. Miller
parent b9b6695cf0
commit a43a9ef6a2
3 changed files with 12 additions and 1 deletions
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1
drivers/net/vxlan.c
View File

@ -2530,6 +2530,7 @@ static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
udp_conf.family = AF_INET6;
udp_conf.use_udp6_rx_checksums =
!(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
udp_conf.ipv6_v6only = 1;
} else {
udp_conf.family = AF_INET;
}

3
include/net/udp_tunnel.h
View File

@ -31,7 +31,8 @@ struct udp_port_cfg {
__be16 peer_udp_port;
unsigned int use_udp_checksums:1,
use_udp6_tx_checksums:1,
use_udp6_rx_checksums:1;
use_udp6_rx_checksums:1,
ipv6_v6only:1;
};
int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,

9
net/ipv6/ip6_udp_tunnel.c
View File

@ -23,6 +23,15 @@ int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
if (err < 0)
goto error;
if (cfg->ipv6_v6only) {
int val = 1;
err = kernel_setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
(char *) &val, sizeof(val));
if (err < 0)
goto error;
}
udp6_addr.sin6_family = AF_INET6;
memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
sizeof(udp6_addr.sin6_addr));