Commit 854da991 authored by Robert Shearman's avatar Robert Shearman Committed by David S. Miller
Browse files

ipv4: Allow sending multicast packets on specific i/f using VRF socket 



It is useful to be able to use the same socket for listening in a
specific VRF, as for sending multicast packets out of a specific
interface. However, the bound device on the socket currently takes
precedence and results in the packets not being sent.

Relax the condition on overriding the output interface to use for
sending packets out of UDP, raw and ping sockets to allow multicast
packets to be sent using the specified multicast interface.

Signed-off-by: default avatarRobert Shearman <rshearma@vyatta.att-mail.com>
Signed-off-by: default avatarMike Manning <mmanning@vyatta.att-mail.com>
Reviewed-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6919622a

net/ipv4/datagram.c

+1 −1
Original line number Diff line number Diff line
@@ -42,7 +42,7 @@ int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len 
	oif = sk->sk_bound_dev_if;

	saddr = inet->inet_saddr;

	if (ipv4_is_multicast(usin->sin_addr.s_addr)) {

		if (!oif)

		if (!oif || netif_index_is_l3_master(sock_net(sk), oif))

			oif = inet->mc_index;

		if (!saddr)

			saddr = inet->mc_addr;

net/ipv4/ping.c

+1 −1
Original line number Diff line number Diff line
@@ -779,7 +779,7 @@ static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 
	}



	if (ipv4_is_multicast(daddr)) {

		if (!ipc.oif)

		if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif))

			ipc.oif = inet->mc_index;

		if (!saddr)

			saddr = inet->mc_addr;

net/ipv4/raw.c

+1 −1
Original line number Diff line number Diff line
@@ -608,7 +608,7 @@ static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 
		tos |= RTO_ONLINK;



	if (ipv4_is_multicast(daddr)) {

		if (!ipc.oif)

		if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif))

			ipc.oif = inet->mc_index;

		if (!saddr)

			saddr = inet->mc_addr;

net/ipv4/udp.c

+1 −1
Original line number Diff line number Diff line
@@ -1042,7 +1042,7 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 
	}



	if (ipv4_is_multicast(daddr)) {

		if (!ipc.oif)

		if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif))

			ipc.oif = inet->mc_index;

		if (!saddr)

			saddr = inet->mc_addr;

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