zebra: subscribe to bridge vlan netlink messages

Add code to subscribe toe bridge vlan messaging code
and appropriate debug output for it.

Signed-off-by: Stephen Worley <sworley@nvidia.com>

diff --git a/zebra/kernel_netlink.c b/zebra/kernel_netlink.c
index 0c453507004f3ef8b52c6a443d5f8e28e3468521..45fb24a210c1835393f6dbdc64449a2a7d4cdfd0 100644 (file)
--- a/zebra/kernel_netlink.c
+++ b/zebra/kernel_netlink.c
@@ -1767,7 +1767,7 @@ void kernel_init(struct zebra_ns *zns)
 {
        uint32_t groups, dplane_groups, ext_groups;
 #if defined SOL_NETLINK
-       int one, ret;
+       int one, ret, grp;
 #endif
 
        /*
@@ -1778,6 +1778,11 @@ void kernel_init(struct zebra_ns *zns)
         * keeping track of all the different values would
         * lead to confusion, so we need to convert the
         * RTNLGRP_XXX to a bit position for ourself
+        *
+        *
+        * NOTE: If the bit is >= 32, you must use setsockopt(). Those
+        * groups are added further below after SOL_NETLINK is verified to
+        * exist.
         */
        groups = RTMGRP_LINK                   |
                        RTMGRP_IPV4_ROUTE              |
@@ -1857,6 +1862,14 @@ void kernel_init(struct zebra_ns *zns)
         * sure that we want to pull into our build system.
         */
 #if defined SOL_NETLINK
+
+       /*
+        * setsockopt multicast group subscriptions that don't fit in nl_groups
+        */
+       grp = RTNLGRP_BRVLAN;
+       ret = setsockopt(zns->netlink.sock, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP,
+                        &grp, sizeof(grp));
+
        /*
         * Let's tell the kernel that we want to receive extended
         * ACKS over our command socket(s)