static void
handle_route_msg(const struct route_table_msg *msg, void *data)
{
    struct route_msg_handle_data *handle_data = data;
    const struct route_data *rd = &msg->rd;
    struct advertise_route_entry *ar;
    int err;

    /* This route is not from us, so we learn it. */
    if (rd->rtm_protocol != RTPROT_OVN) {
        if (!handle_data->learned_routes) {
            return;
        }
        if (prefix_is_link_local(&rd->rta_dst, rd->rtm_dst_len)) {
            return;
        }
        struct route_data_nexthop *nexthop;
        LIST_FOR_EACH (nexthop, nexthop_node, &rd->nexthops) {
            if (ipv6_is_zero(&nexthop->addr)) {
                /* This is most likely an address on the local link.
                 * As we just want to learn remote routes we do not need it.*/
                continue;
            }
            struct re_nl_received_route_node rr;
            rr = (struct re_nl_received_route_node) {
                .db = handle_data->db,
                .prefix = rd->rta_dst,
                .plen = rd->rtm_dst_len,
                .nexthop = nexthop->addr,
            };
            memcpy(rr.ifname, nexthop->ifname, IFNAMSIZ);
            rr.ifname[IFNAMSIZ] = '\0';

            vector_push(handle_data->learned_routes, &rr);
        }
        return;
    }

    if (handle_data->routes_to_advertise) {
        uint32_t hash = advertise_route_hash(&rd->rta_dst, rd->rtm_dst_len);
        HMAP_FOR_EACH_WITH_HASH (ar, node, hash, handle_data->routes) {
            if (ipv6_addr_equals(&ar->addr, &rd->rta_dst)
                    && ar->plen == rd->rtm_dst_len
                    && ar->priority == rd->rta_priority) {
                hmapx_find_and_delete(handle_data->routes_to_advertise, ar);
                return;
            }
        }
    }
    err = re_nl_delete_route(rd->rta_table_id, &rd->rta_dst,
                             rd->rtm_dst_len, rd->rta_priority);
    if (err) {
        char addr_s[INET6_ADDRSTRLEN + 1];
        static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
        VLOG_WARN_RL(&rl, "Delete route table_id=%"PRIu32" dst=%s plen=%d "
                     "failed: %s", rd->rta_table_id,
                     ipv6_string_mapped(
                         addr_s, &rd->rta_dst) ? addr_s : "(invalid)",
                     rd->rtm_dst_len,
                     ovs_strerror(err));

        if (!handle_data->ret) {
            /* Report the first error value to the caller. */
            handle_data->ret = err;
        }
    }
}