--- fwsync/driver/fwsync_workers.c	2022/07/11 12:58:58	1.3
+++ fwsync/driver/fwsync_workers.c	2022/07/11 15:59:42	1.4
@@ -19,15 +19,23 @@ fwsync_sndpkt_handler(void *context, int pending)
 	do {
 		mtx_lock(&fws_mtx_c);
 		pkt = TAILQ_FIRST(&fwsync_sndpkt);
-		TAILQ_REMOVE(&fwsync_sndpkt, pkt, sp_next);
+		if (pkt)
+			TAILQ_REMOVE(&fwsync_sndpkt, pkt, sp_next);
 		mtx_unlock(&fws_mtx_c);
 
-		if (!(fws_cfg.cfg.on & CFG_SYNC_COLLECTOR))
+		if (!pkt)	/* sending queue is empty */
+			break;
+
+		if (!(fws_cfg.cfg.on & CFG_SYNC_COLLECTOR)) {
+			free(pkt, M_FWSYNC);
 			continue;
+		}
 
 		m = m_gethdr(M_NOWAIT, MT_DATA);
-		if (!m)
+		if (!m) {
+			free(pkt, M_FWSYNC);
 			continue;
+		}
 
 		memcpy(mtod(m, struct fws_proto *), &pkt->sp_proto, sizeof pkt->sp_proto);
 		m->m_len = sizeof pkt->sp_proto;
@@ -62,19 +70,20 @@ fwsync_sndpkt_handler(void *context, int pending)
 		}
 out:
 		m_freem(m);
+		free(pkt, M_FWSYNC);
 	} while (--pending);
 }
 
 int
-fwsync_state_handler(void *arg)
+fwsync_state_handler(const void *arg)
 {
-	struct ipfw_flow_id *pkt = arg;
+	const struct ipfw_flow_id *pkt = arg;
 	struct fws_proto *spkt;
 	struct fws_sndpkt *p;
 
 	DTRACE();
 
-	if (pkt->addr_type == 1)
+	if (!pkt || pkt->addr_type == 1)
 		return 0;	/* skip ethernet packet */
 
 	mtx_lock(&fws_mtx_c);
@@ -119,9 +128,42 @@ fwsync_state_handler(void *arg)
 }
 
 int
-fwsync_alias_handler(void *arg)
+fwsync_alias_handler(const void *arg)
 {
+	const struct alias_link *lnk = arg;
+	struct fws_proto *spkt;
+	struct fws_sndpkt *p;
+
 	DTRACE();
 
+	if (!lnk || lnk->link_type >= IPPROTO_MAX)
+		return 0;
+
+	mtx_lock(&fws_mtx_c);
+
+	p = malloc(sizeof(struct fws_proto), M_FWSYNC, M_NOWAIT | M_ZERO);
+	if (!p) {
+		mtx_unlock(&fws_mtx_c);
+		return 0;
+	} else
+		spkt = &p->sp_proto;
+
+	spkt->fws_version = FWS_PKTVER_ALIAS;
+	spkt->fws_proto = lnk->link_type;
+	spkt->fws_addrtype = 4;
+	spkt->fws_sport = lnk->src_port;
+	spkt->fws_dport = lnk->dst_port;
+	spkt->fws_aport = lnk->alias_port;
+	spkt->fws_pport = lnk->proxy_port;
+	spkt->fws_saddr.s_addr = lnk->src_addr.s_addr;
+	spkt->fws_daddr.s_addr = lnk->dst_addr.s_addr;
+	spkt->fws_aaddr.s_addr = lnk->alias_addr.s_addr;
+	spkt->fws_paddr.s_addr = lnk->proxy_addr.s_addr;
+
+	TAILQ_INSERT_TAIL(&fwsync_sndpkt, p, sp_next);
+
+	mtx_unlock(&fws_mtx_c);
+
+	taskqueue_enqueue(fws_tq, &fws_sndpkt_task);
 	return 0;
 }