Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

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

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

net/ipv4/udp.c

+21 −1
Original line number Diff line number Diff line
@@ -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));