pimd: Allow pim to work in vrf's without explicitly configuring the vrf device

Under vrf's pim needs to have a socket listening for pim packets on the vrf
device so that we can actually get the packets.  As such when we configure
up a vrf interface, configure just enough to allow it to listen on the
device and to do the right thing.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/pimd/pim_zebra.c b/pimd/pim_zebra.c
index 8c0715101b..7fc7e42534 100644
--- a/pimd/pim_zebra.c
+++ b/pimd/pim_zebra.c
@@ -89,6 +89,23 @@ static int pim_zebra_if_add(int command, struct zclient *zclient,
 	if (if_is_operative(ifp))
 		pim_if_addr_add_all(ifp);
 
+	/*
+	 * If we are a vrf device that is up, open up the pim_socket for
+	 * listening
+	 * to incoming pim messages irrelevant if the user has configured us
+	 * for pim or not.
+	 */
+	if (pim_if_is_vrf_device(ifp)) {
+		struct pim_interface *pim_ifp;
+
+		if (!ifp->info) {
+			pim_ifp = pim_if_new(ifp, 0, 0);
+			ifp->info = pim_ifp;
+		}
+
+		pim_sock_add(ifp);
+	}
+
 	return 0;
 }