Commit 9a24abfa authored by David Ahern's avatar David Ahern Committed by David S. Miller

udp: Handle VRF device in sendmsg

For unconnected UDP sockets using a VRF device lookup source address
based on VRF table. This allows the UDP header to be properly setup
before showing up at the VRF device via the dst.
Signed-off-by: default avatarShrijeet Mukherjee <shm@cumulusnetworks.com>
Signed-off-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 613d09b3
......@@ -1013,11 +1013,31 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if (!rt) {
struct net *net = sock_net(sk);
__u8 flow_flags = inet_sk_flowi_flags(sk);
fl4 = &fl4_stack;
/* unconnected socket. If output device is enslaved to a VRF
* device lookup source address from VRF table. This mimics
* behavior of ip_route_connect{_init}.
*/
if (netif_index_is_vrf(net, ipc.oif)) {
flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos,
RT_SCOPE_UNIVERSE, sk->sk_protocol,
(flow_flags | FLOWI_FLAG_VRFSRC),
faddr, saddr, dport,
inet->inet_sport);
rt = ip_route_output_flow(net, fl4, sk);
if (!IS_ERR(rt)) {
saddr = fl4->saddr;
ip_rt_put(rt);
}
}
flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos,
RT_SCOPE_UNIVERSE, sk->sk_protocol,
inet_sk_flowi_flags(sk),
flow_flags,
faddr, saddr, dport, inet->inet_sport);
security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
......
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