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 b6ec8341a7b1a1322502233374691c90f8381925..b9861acad2b3369528be6c5c344fa311fc06d925 100644 (file)
--- a/bgpd/bgp_evpn_mh.c
+++ b/bgpd/bgp_evpn_mh.c
@@ -1201,6 +1201,7 @@ 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,
@@ -1225,6 +1226,7 @@ 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
@@ -1233,12 +1235,11 @@ 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);
+               bgp_withdraw(peer, (struct prefix *)&p, addpath_id, afi, safi, ZEBRA_ROUTE_BGP,
+                            BGP_ROUTE_NORMAL, &prd, &label, num_labels);
        }
        return 0;
 }