bgpd: extend make_prefix to form srv6-based prefix

Enable the SRv6 SID prefix generation in make_prefix()
function of bgp_nht.c.

Signed-off-by: Dmytro Shytyi <dmytro.shytyi@6wind.com>

fixup: bgpd: extend make_prefix to form srv6-based prefix

bgpd/bgp_nht.c

@@ -1045,8 +1045,11 @@ static int make_prefix(int afi, struct bgp_path_info *pi, struct prefix *p)
 		break;
 	case AFI_IP6:
 		p->family = AF_INET6;
-
-		if (is_bgp_static) {
+		if (pi->attr && pi->attr->srv6_l3vpn) {
+			IPV6_ADDR_COPY(&(p->u.prefix6),
+				       &(pi->attr->srv6_l3vpn->sid));
+			p->prefixlen = IPV6_MAX_BITLEN;
+		} else if (is_bgp_static) {
 			p->u.prefix6 = p_orig->u.prefix6;
 			p->prefixlen = p_orig->prefixlen;
 		} else {