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udp_tunnel: add config option to bind to a device

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UDP tunnel sockets are always opened unbound to a specific device. This
patch allow the socket to be bound on a custom device, which
incidentally makes UDP tunnels VRF-aware if binding to an l3mdev.

Signed-off-by: Alexis Bauvin <abauvin@scaleway.com>
Reviewed-by: Amine Kherbouche <akherbouche@scaleway.com>
Tested-by: Amine Kherbouche <akherbouche@scaleway.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexis Bauvin
2018-12-03 10:54:38 +01:00
committed by David S. Miller
parent e3dd762772
commit da5095d052
3 changed files with 34 additions and 0 deletions
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17
net/ipv4/udp_tunnel.c
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@@ -20,6 +20,23 @@ int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
if (err < 0)
goto error;
if (cfg->bind_ifindex) {
struct net_device *dev;
dev = dev_get_by_index(net, cfg->bind_ifindex);
if (!dev) {
err = -ENODEV;
goto error;
}
err = kernel_setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE,
dev->name, strlen(dev->name) + 1);
dev_put(dev);
if (err < 0)
goto error;
}
udp_addr.sin_family = AF_INET;
udp_addr.sin_addr = cfg->local_ip;
udp_addr.sin_port = cfg->local_udp_port;