bgpd: fix add label support to EVPN AD routes

When peering with an EVPN device from other vendor, FRR acting as route
reflector is not able to read nor transmit the label value.

Actually, EVPN AD routes completely ignore the label value in the code,
whereas in some functionalities like evpn-vpws, it is authorised to
carry and propagate label value.

Fix this by handling the label value.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

diff --git a/bgpd/bgp_evpn_mh.c b/bgpd/bgp_evpn_mh.c
index aa28b6f3d8400997f3fe1bb9f7cb87a7941170ea..375687fe0f796802b00104a31ee0bfb7e0a02432 100644 (file)
--- a/bgpd/bgp_evpn_mh.c
+++ b/bgpd/bgp_evpn_mh.c
@@ -1202,6 +1202,7 @@ int bgp_evpn_type1_route_process(struct peer *peer, afi_t afi, safi_t safi,
        mpls_label_t label;
        struct in_addr vtep_ip;
        struct prefix_evpn p;
+       uint8_t num_labels = 0;
 
        if (psize != BGP_EVPN_TYPE1_PSIZE) {
                flog_err(EC_BGP_EVPN_ROUTE_INVALID,
@@ -1226,6 +1227,7 @@ int bgp_evpn_type1_route_process(struct peer *peer, afi_t afi, safi_t safi,
        pfx += EVPN_ETH_TAG_BYTES;
 
        memcpy(&label, pfx, BGP_LABEL_BYTES);
+       num_labels++;
 
        /* EAD route prefix doesn't include the nexthop in the global
         * table
@@ -1234,13 +1236,11 @@ int bgp_evpn_type1_route_process(struct peer *peer, afi_t afi, safi_t safi,
        build_evpn_type1_prefix(&p, eth_tag, &esi, vtep_ip);
        /* Process the route. */
        if (attr) {
-               bgp_update(peer, (struct prefix *)&p, addpath_id, attr, afi,
-                          safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL, &prd, NULL,
-                          0, 0, NULL);
+               bgp_update(peer, (struct prefix *)&p, addpath_id, attr, afi, safi, ZEBRA_ROUTE_BGP,
+                          BGP_ROUTE_NORMAL, &prd, &label, num_labels, 0, NULL);
        } else {
-               bgp_withdraw(peer, (struct prefix *)&p, addpath_id, afi, safi,
-                            ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL, &prd, NULL, 0,
-                            NULL);
+               bgp_withdraw(peer, (struct prefix *)&p, addpath_id, afi, safi, ZEBRA_ROUTE_BGP,
+                            BGP_ROUTE_NORMAL, &prd, &label, num_labels, NULL);
        }
        return 0;
 }