156 	struct l2tp_seq		seq;		/* ctrl sequence number state */  member
192 static void	ng_l2tp_seq_check(struct l2tp_seq *seq);
340 #define L2TP_SEQ_CHECK(seq)	ng_l2tp_seq_check(seq)  argument
651 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_shutdown()  local
654 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_shutdown()
660 	ng_uncallout(&seq->rack_timer, node);  in ng_l2tp_shutdown()
661 	ng_uncallout(&seq->xack_timer, node);  in ng_l2tp_shutdown()
663 	mtx_destroy(&seq->mtx);  in ng_l2tp_shutdown()
761 	L2TP_SEQ_CHECK(&priv->seq);  in ng_l2tp_rcvdata_lower()
900 		struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_rcvdata_lower()  local
913 		mtx_lock(&seq->mtx);  in ng_l2tp_rcvdata_lower()
918 		if (ns != seq->nr || seq->inproc) {  in ng_l2tp_rcvdata_lower()
919 			if (L2TP_SEQ_DIFF(ns, seq->nr) <= 0)  in ng_l2tp_rcvdata_lower()
923 			mtx_unlock(&seq->mtx);  in ng_l2tp_rcvdata_lower()
924 			ng_l2tp_xmit_ctrl(priv, NULL, seq->ns);  in ng_l2tp_rcvdata_lower()
933 		seq->inproc = 1;  in ng_l2tp_rcvdata_lower()
934 		mtx_unlock(&seq->mtx);  in ng_l2tp_rcvdata_lower()
939 			seq->inproc = 0;  in ng_l2tp_rcvdata_lower()
950 		mtx_lock(&seq->mtx);  in ng_l2tp_rcvdata_lower()
952 		seq->inproc = 0;  in ng_l2tp_rcvdata_lower()
957 			seq->nr++;  in ng_l2tp_rcvdata_lower()
959 			if (!callout_active(&seq->xack_timer)) {  in ng_l2tp_rcvdata_lower()
960 				ng_callout(&seq->xack_timer, priv->node, NULL,  in ng_l2tp_rcvdata_lower()
965 		mtx_unlock(&seq->mtx);  in ng_l2tp_rcvdata_lower()
1001 	L2TP_SEQ_CHECK(&priv->seq);  in ng_l2tp_rcvdata_lower()
1013 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_rcvdata_ctrl()  local
1020 	L2TP_SEQ_CHECK(&priv->seq);  in ng_l2tp_rcvdata_ctrl()
1046 	mtx_lock(&seq->mtx);  in ng_l2tp_rcvdata_ctrl()
1049 	for (i = 0; i < L2TP_MAX_XWIN && seq->xwin[i] != NULL; i++);  in ng_l2tp_rcvdata_ctrl()
1051 		mtx_unlock(&seq->mtx);  in ng_l2tp_rcvdata_ctrl()
1056 	seq->xwin[i] = m;  in ng_l2tp_rcvdata_ctrl()
1059 	if (i >= seq->cwnd) {  in ng_l2tp_rcvdata_ctrl()
1060 		mtx_unlock(&seq->mtx);  in ng_l2tp_rcvdata_ctrl()
1065 	if (!callout_active(&seq->rack_timer))  in ng_l2tp_rcvdata_ctrl()
1066 		ng_callout(&seq->rack_timer, node, NULL,  in ng_l2tp_rcvdata_ctrl()
1069 	ns = seq->ns++;  in ng_l2tp_rcvdata_ctrl()
1071 	mtx_unlock(&seq->mtx);  in ng_l2tp_rcvdata_ctrl()
1083 	L2TP_SEQ_CHECK(&priv->seq);  in ng_l2tp_rcvdata_ctrl()
1102 	L2TP_SEQ_CHECK(&priv->seq);  in ng_l2tp_rcvdata()
1165 	L2TP_SEQ_CHECK(&priv->seq);  in ng_l2tp_rcvdata()
1194 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_seq_init()  local
1198 	memset(seq, 0, sizeof(*seq));  in ng_l2tp_seq_init()
1199 	seq->cwnd = 1;  in ng_l2tp_seq_init()
1200 	seq->wmax = priv->conf.peer_win;  in ng_l2tp_seq_init()
1201 	if (seq->wmax > L2TP_MAX_XWIN)  in ng_l2tp_seq_init()
1202 		seq->wmax = L2TP_MAX_XWIN;  in ng_l2tp_seq_init()
1203 	seq->ssth = seq->wmax;  in ng_l2tp_seq_init()
1204 	ng_callout_init(&seq->rack_timer);  in ng_l2tp_seq_init()
1205 	ng_callout_init(&seq->xack_timer);  in ng_l2tp_seq_init()
1206 	mtx_init(&seq->mtx, "ng_l2tp", NULL, MTX_DEF);  in ng_l2tp_seq_init()
1207 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_seq_init()
1216 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_seq_set()  local
1227 	seq->ns = conf->ns;  in ng_l2tp_seq_set()
1228 	seq->nr = conf->nr;  in ng_l2tp_seq_set()
1229 	seq->rack = conf->rack;  in ng_l2tp_seq_set()
1230 	seq->xack = conf->xack;  in ng_l2tp_seq_set()
1241 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_seq_adjust()  local
1256 	if (new_wmax < seq->wmax)  in ng_l2tp_seq_adjust()
1258 	seq->wmax = new_wmax;  in ng_l2tp_seq_adjust()
1270 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_seq_reset()  local
1275 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_seq_reset()
1278 	ng_uncallout(&seq->rack_timer, priv->node);  in ng_l2tp_seq_reset()
1279 	ng_uncallout(&seq->xack_timer, priv->node);  in ng_l2tp_seq_reset()
1283 		if (seq->xwin[i] == NULL)  in ng_l2tp_seq_reset()
1285 		m_freem(seq->xwin[i]);  in ng_l2tp_seq_reset()
1292 	seq->ns = 0;  in ng_l2tp_seq_reset()
1293 	seq->nr = 0;  in ng_l2tp_seq_reset()
1294 	seq->rack = 0;  in ng_l2tp_seq_reset()
1295 	seq->xack = 0;  in ng_l2tp_seq_reset()
1296 	seq->wmax = L2TP_MAX_XWIN;  in ng_l2tp_seq_reset()
1297 	seq->cwnd = 1;  in ng_l2tp_seq_reset()
1298 	seq->ssth = seq->wmax;  in ng_l2tp_seq_reset()
1299 	seq->acks = 0;  in ng_l2tp_seq_reset()
1300 	seq->rexmits = 0;  in ng_l2tp_seq_reset()
1301 	bzero(seq->xwin, sizeof(seq->xwin));  in ng_l2tp_seq_reset()
1304 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_seq_reset()
1313 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_seq_recv_nr()  local
1319 	mtx_lock(&seq->mtx);  in ng_l2tp_seq_recv_nr()
1322 	if ((nack = L2TP_SEQ_DIFF(nr, seq->rack)) <= 0) {  in ng_l2tp_seq_recv_nr()
1323 		mtx_unlock(&seq->mtx);  in ng_l2tp_seq_recv_nr()
1326 	if (L2TP_SEQ_DIFF(nr, seq->ns) > 0) {  in ng_l2tp_seq_recv_nr()
1327 		mtx_unlock(&seq->mtx);  in ng_l2tp_seq_recv_nr()
1335 	seq->rack = nr;  in ng_l2tp_seq_recv_nr()
1336 	seq->rexmits = 0;  in ng_l2tp_seq_recv_nr()
1340 		m_freem(seq->xwin[i]);  in ng_l2tp_seq_recv_nr()
1341 	memmove(seq->xwin, seq->xwin + nack,  in ng_l2tp_seq_recv_nr()
1342 	    (L2TP_MAX_XWIN - nack) * sizeof(*seq->xwin));  in ng_l2tp_seq_recv_nr()
1343 	memset(seq->xwin + (L2TP_MAX_XWIN - nack), 0,  in ng_l2tp_seq_recv_nr()
1344 	    nack * sizeof(*seq->xwin));  in ng_l2tp_seq_recv_nr()
1351 	if (seq->cwnd < seq->wmax) {  in ng_l2tp_seq_recv_nr()
1354 		if (seq->cwnd < seq->ssth) {  in ng_l2tp_seq_recv_nr()
1355 			seq->cwnd += nack;  in ng_l2tp_seq_recv_nr()
1357 			if (seq->cwnd > seq->ssth) {	/* into cg.av. phase */  in ng_l2tp_seq_recv_nr()
1358 				nack = seq->cwnd - seq->ssth;  in ng_l2tp_seq_recv_nr()
1359 				seq->cwnd = seq->ssth;  in ng_l2tp_seq_recv_nr()
1364 		if (seq->cwnd >= seq->ssth) {  in ng_l2tp_seq_recv_nr()
1365 			seq->acks += nack;  in ng_l2tp_seq_recv_nr()
1366 			while (seq->acks >= seq->cwnd) {  in ng_l2tp_seq_recv_nr()
1367 				seq->acks -= seq->cwnd;  in ng_l2tp_seq_recv_nr()
1368 				if (seq->cwnd < seq->wmax)  in ng_l2tp_seq_recv_nr()
1369 					seq->cwnd++;  in ng_l2tp_seq_recv_nr()
1375 	if (callout_active(&seq->rack_timer))  in ng_l2tp_seq_recv_nr()
1376 		ng_uncallout(&seq->rack_timer, priv->node);  in ng_l2tp_seq_recv_nr()
1379 	if (seq->xwin[0] == NULL) {  in ng_l2tp_seq_recv_nr()
1380 		mtx_unlock(&seq->mtx);  in ng_l2tp_seq_recv_nr()
1385 	ng_callout(&seq->rack_timer, priv->node, NULL,  in ng_l2tp_seq_recv_nr()
1392 	ns = seq->ns;  in ng_l2tp_seq_recv_nr()
1394 	while ((i = L2TP_SEQ_DIFF(seq->ns, seq->rack)) < seq->cwnd  in ng_l2tp_seq_recv_nr()
1395 	    && seq->xwin[i] != NULL) {  in ng_l2tp_seq_recv_nr()
1396 		xwin[j++] = seq->xwin[i];  in ng_l2tp_seq_recv_nr()
1397 		seq->ns++;  in ng_l2tp_seq_recv_nr()
1400 	mtx_unlock(&seq->mtx);  in ng_l2tp_seq_recv_nr()
1425 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_seq_xack_timeout()  local
1428 	if (callout_pending(&seq->xack_timer) ||  in ng_l2tp_seq_xack_timeout()
1429 	    (!callout_active(&seq->xack_timer)))  in ng_l2tp_seq_xack_timeout()
1433 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_seq_xack_timeout()
1436 	ng_l2tp_xmit_ctrl(priv, NULL, seq->ns);  in ng_l2tp_seq_xack_timeout()
1442 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_seq_xack_timeout()
1453 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_seq_rack_timeout()  local
1458 	if (callout_pending(&seq->rack_timer) ||  in ng_l2tp_seq_rack_timeout()
1459 	    (!callout_active(&seq->rack_timer)))  in ng_l2tp_seq_rack_timeout()
1463 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_seq_rack_timeout()
1468 	if (seq->rexmits++ >= priv->conf.rexmit_max)  in ng_l2tp_seq_rack_timeout()
1472 	delay = (seq->rexmits > 12) ? (1 << 12) : (1 << seq->rexmits);  in ng_l2tp_seq_rack_timeout()
1475 	ng_callout(&seq->rack_timer, node, NULL,  in ng_l2tp_seq_rack_timeout()
1479 	seq->ns = seq->rack;  in ng_l2tp_seq_rack_timeout()
1480 	seq->ssth = (seq->cwnd + 1) / 2;  in ng_l2tp_seq_rack_timeout()
1481 	seq->cwnd = 1;  in ng_l2tp_seq_rack_timeout()
1482 	seq->acks = 0;  in ng_l2tp_seq_rack_timeout()
1485 	if ((m = L2TP_COPY_MBUF(seq->xwin[0], M_NOWAIT)) == NULL)  in ng_l2tp_seq_rack_timeout()
1488 		ng_l2tp_xmit_ctrl(priv, m, seq->ns++);  in ng_l2tp_seq_rack_timeout()
1494 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_seq_rack_timeout()
1504 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_xmit_ctrl()  local
1509 	mtx_lock(&seq->mtx);  in ng_l2tp_xmit_ctrl()
1513 	if (callout_active(&seq->xack_timer))  in ng_l2tp_xmit_ctrl()
1514 		ng_uncallout(&seq->xack_timer, priv->node);  in ng_l2tp_xmit_ctrl()
1516 	seq->xack = seq->nr;  in ng_l2tp_xmit_ctrl()
1518 	mtx_unlock(&seq->mtx);  in ng_l2tp_xmit_ctrl()
1561 	p[10] = seq->nr >> 8;  in ng_l2tp_xmit_ctrl()
1562 	p[11] = seq->nr & 0xff;  in ng_l2tp_xmit_ctrl()
1578 ng_l2tp_seq_check(struct l2tp_seq *seq)  in ng_l2tp_seq_check()  argument
1585 	mtx_lock(&seq->mtx);  in ng_l2tp_seq_check()
1587 	self_unack = L2TP_SEQ_DIFF(seq->nr, seq->xack);  in ng_l2tp_seq_check()
1588 	peer_unack = L2TP_SEQ_DIFF(seq->ns, seq->rack);  in ng_l2tp_seq_check()
1589 	CHECK(seq->wmax <= L2TP_MAX_XWIN);  in ng_l2tp_seq_check()
1590 	CHECK(seq->cwnd >= 1);  in ng_l2tp_seq_check()
1591 	CHECK(seq->cwnd <= seq->wmax);  in ng_l2tp_seq_check()
1592 	CHECK(seq->ssth >= 1);  in ng_l2tp_seq_check()
1593 	CHECK(seq->ssth <= seq->wmax);  in ng_l2tp_seq_check()
1594 	if (seq->cwnd < seq->ssth)  in ng_l2tp_seq_check()
1595 		CHECK(seq->acks == 0);  in ng_l2tp_seq_check()
1597 		CHECK(seq->acks <= seq->cwnd);  in ng_l2tp_seq_check()
1600 	CHECK(peer_unack <= seq->wmax);  in ng_l2tp_seq_check()
1601 	CHECK((self_unack == 0) ^ callout_active(&seq->xack_timer));  in ng_l2tp_seq_check()
1602 	CHECK((peer_unack == 0) ^ callout_active(&seq->rack_timer));  in ng_l2tp_seq_check()
1604 		CHECK(seq->xwin[i] != NULL);  in ng_l2tp_seq_check()
1605 	for ( ; i < seq->cwnd; i++)	    /* verify peer's recv window full */  in ng_l2tp_seq_check()
1606 		CHECK(seq->xwin[i] == NULL);  in ng_l2tp_seq_check()
1608 	mtx_unlock(&seq->mtx);  in ng_l2tp_seq_check()