From 90133de64ca73c7dfcd2ed499be5544421c0ca96 Mon Sep 17 00:00:00 2001
From: Donald Sharp <sharpd@cumulusnetworks.com>
Date: Wed, 14 Jun 2017 13:11:35 -0400
Subject: [PATCH] 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>
---
 pimd/pim_iface.c | 13 +++++++++++++
 pimd/pim_iface.h |  2 ++
 pimd/pim_zebra.c | 17 +++++++++++++++++
 3 files changed, 32 insertions(+)

diff --git a/pimd/pim_iface.c b/pimd/pim_iface.c
index 19747ebcb3..8628da2c8d 100644
--- a/pimd/pim_iface.c
+++ b/pimd/pim_iface.c
@@ -1593,3 +1593,16 @@ int pim_if_is_loopback(struct pim_instance *pim, struct interface *ifp)
 
 	return 0;
 }
+
+int pim_if_is_vrf_device(struct interface *ifp)
+{
+	struct vrf *vrf;
+
+	RB_FOREACH(vrf, vrf_name_head, &vrfs_by_name)
+	{
+		if (strncmp(ifp->name, vrf->name, strlen(ifp->name)) == 0)
+			return 1;
+	}
+
+	return 0;
+}
diff --git a/pimd/pim_iface.h b/pimd/pim_iface.h
index 7eff299023..963d41fc3e 100644
--- a/pimd/pim_iface.h
+++ b/pimd/pim_iface.h
@@ -206,4 +206,6 @@ int pim_if_connected_to_source(struct interface *ifp, struct in_addr src);
 int pim_update_source_set(struct interface *ifp, struct in_addr source);
 
 int pim_if_is_loopback(struct pim_instance *pim, struct interface *ifp);
+
+int pim_if_is_vrf_device(struct interface *ifp);
 #endif /* PIM_IFACE_H */
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;
 }
 
-- 
2.39.5