146 	struct l2tp_seq		seq;		/* ctrl sequence number state */  member
186 static void	ng_l2tp_seq_check(struct l2tp_seq *seq);
294 #define L2TP_SEQ_CHECK(seq)	ng_l2tp_seq_check(seq)  argument
587 	L2TP_SEQ_CHECK(&priv->seq);  in ng_l2tp_rcvdata()
612 	L2TP_SEQ_CHECK(&priv->seq);  in ng_l2tp_rcvdata()
623 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_shutdown()  local
626 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_shutdown()
635 	if (!seq->rack_timer_running && !seq->xack_timer_running) {  in ng_l2tp_shutdown()
893 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_recv_ctrl()  local
914 	for (i = 0; i < L2TP_MAX_XWIN && seq->xwin[i] != NULL; i++);  in ng_l2tp_recv_ctrl()
920 	seq->xwin[i] = m;  in ng_l2tp_recv_ctrl()
923 	KASSERT((i == 0) ^ seq->rack_timer_running,  in ng_l2tp_recv_ctrl()
925 	    __func__, i, seq->rack_timer_running ? "" : "not "));  in ng_l2tp_recv_ctrl()
928 	if (i >= seq->cwnd)  in ng_l2tp_recv_ctrl()
932 	if (!seq->rack_timer_running) {  in ng_l2tp_recv_ctrl()
933 		callout_reset(&seq->rack_timer,  in ng_l2tp_recv_ctrl()
935 		seq->rack_timer_running = 1;  in ng_l2tp_recv_ctrl()
940 	if ((m = L2TP_COPY_MBUF(seq->xwin[i], M_NOWAIT)) == NULL) {  in ng_l2tp_recv_ctrl()
946 	return (ng_l2tp_xmit_ctrl(priv, m, seq->ns++));  in ng_l2tp_recv_ctrl()
1022 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_seq_init()  local
1026 	memset(seq, 0, sizeof(*seq));  in ng_l2tp_seq_init()
1027 	seq->cwnd = 1;  in ng_l2tp_seq_init()
1028 	seq->wmax = priv->conf.peer_win;  in ng_l2tp_seq_init()
1029 	if (seq->wmax > L2TP_MAX_XWIN)  in ng_l2tp_seq_init()
1030 		seq->wmax = L2TP_MAX_XWIN;  in ng_l2tp_seq_init()
1031 	seq->ssth = seq->wmax;  in ng_l2tp_seq_init()
1032 	seq->max_rexmits = priv->conf.rexmit_max;  in ng_l2tp_seq_init()
1033 	seq->max_rexmit_to = priv->conf.rexmit_max_to;  in ng_l2tp_seq_init()
1034 	callout_init(&seq->rack_timer);  in ng_l2tp_seq_init()
1035 	callout_init(&seq->xack_timer);  in ng_l2tp_seq_init()
1036 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_seq_init()
1045 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_seq_adjust()  local
1060 	if (new_wmax < seq->wmax)  in ng_l2tp_seq_adjust()
1062 	seq->wmax = new_wmax;  in ng_l2tp_seq_adjust()
1065 	seq->max_rexmits = conf->rexmit_max;  in ng_l2tp_seq_adjust()
1066 	seq->max_rexmit_to = conf->rexmit_max_to;  in ng_l2tp_seq_adjust()
1078 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_seq_reset()  local
1084 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_seq_reset()
1087 	if (seq->rack_timer_running && callout_stop(&seq->rack_timer) == 1) {  in ng_l2tp_seq_reset()
1088 		seq->rack_timer_running = 0;  in ng_l2tp_seq_reset()
1091 	if (seq->xack_timer_running && callout_stop(&seq->xack_timer) == 1) {  in ng_l2tp_seq_reset()
1092 		seq->xack_timer_running = 0;  in ng_l2tp_seq_reset()
1098 		if (seq->xwin[i] == NULL)  in ng_l2tp_seq_reset()
1100 		m_freem(seq->xwin[i]);  in ng_l2tp_seq_reset()
1114 	memset(seq, 0, sizeof(*seq));  in ng_l2tp_seq_reset()
1115 	seq->cwnd = 1;  in ng_l2tp_seq_reset()
1116 	seq->wmax = L2TP_MAX_XWIN;  in ng_l2tp_seq_reset()
1117 	seq->ssth = seq->wmax;  in ng_l2tp_seq_reset()
1120 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_seq_reset()
1129 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_seq_recv_nr()  local
1135 	if ((nack = L2TP_SEQ_DIFF(nr, seq->rack)) <= 0)  in ng_l2tp_seq_recv_nr()
1137 	if (L2TP_SEQ_DIFF(nr, seq->ns) > 0) {  in ng_l2tp_seq_recv_nr()
1145 	seq->rack = nr;  in ng_l2tp_seq_recv_nr()
1146 	seq->rexmits = 0;  in ng_l2tp_seq_recv_nr()
1150 		m_freem(seq->xwin[i]);  in ng_l2tp_seq_recv_nr()
1151 	memmove(seq->xwin, seq->xwin + nack,  in ng_l2tp_seq_recv_nr()
1152 	    (L2TP_MAX_XWIN - nack) * sizeof(*seq->xwin));  in ng_l2tp_seq_recv_nr()
1153 	memset(seq->xwin + (L2TP_MAX_XWIN - nack), 0,  in ng_l2tp_seq_recv_nr()
1154 	    nack * sizeof(*seq->xwin));  in ng_l2tp_seq_recv_nr()
1161 	if (seq->cwnd < seq->wmax) {  in ng_l2tp_seq_recv_nr()
1164 		if (seq->cwnd < seq->ssth) {  in ng_l2tp_seq_recv_nr()
1165 			seq->cwnd += nack;  in ng_l2tp_seq_recv_nr()
1167 			if (seq->cwnd > seq->ssth) {	/* into cg.av. phase */  in ng_l2tp_seq_recv_nr()
1168 				nack = seq->cwnd - seq->ssth;  in ng_l2tp_seq_recv_nr()
1169 				seq->cwnd = seq->ssth;  in ng_l2tp_seq_recv_nr()
1174 		if (seq->cwnd >= seq->ssth) {  in ng_l2tp_seq_recv_nr()
1175 			seq->acks += nack;  in ng_l2tp_seq_recv_nr()
1176 			while (seq->acks >= seq->cwnd) {  in ng_l2tp_seq_recv_nr()
1177 				seq->acks -= seq->cwnd;  in ng_l2tp_seq_recv_nr()
1178 				if (seq->cwnd < seq->wmax)  in ng_l2tp_seq_recv_nr()
1179 					seq->cwnd++;  in ng_l2tp_seq_recv_nr()
1185 	if (seq->rack_timer_running && callout_stop(&seq->rack_timer) == 1) {  in ng_l2tp_seq_recv_nr()
1186 		seq->rack_timer_running = 0;  in ng_l2tp_seq_recv_nr()
1191 	if (seq->xwin[0] == NULL)  in ng_l2tp_seq_recv_nr()
1195 	callout_reset(&seq->rack_timer,  in ng_l2tp_seq_recv_nr()
1197 	seq->rack_timer_running = 1;  in ng_l2tp_seq_recv_nr()
1205 	while ((i = L2TP_SEQ_DIFF(seq->ns, seq->rack)) < seq->cwnd  in ng_l2tp_seq_recv_nr()
1206 	    && seq->xwin[i] != NULL) {  in ng_l2tp_seq_recv_nr()
1207 		if ((m = L2TP_COPY_MBUF(seq->xwin[i], M_NOWAIT)) == NULL)  in ng_l2tp_seq_recv_nr()
1210 			ng_l2tp_xmit_ctrl(priv, m, seq->ns);  in ng_l2tp_seq_recv_nr()
1211 		seq->ns++;  in ng_l2tp_seq_recv_nr()
1228 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_seq_recv_ns()  local
1231 	if (ns != seq->nr) {  in ng_l2tp_seq_recv_ns()
1232 		if (L2TP_SEQ_DIFF(ns, seq->nr) < 0)  in ng_l2tp_seq_recv_ns()
1236 		ng_l2tp_xmit_ctrl(priv, NULL, seq->ns);  in ng_l2tp_seq_recv_ns()
1241 	seq->nr++;  in ng_l2tp_seq_recv_ns()
1244 	if (!seq->xack_timer_running) {  in ng_l2tp_seq_recv_ns()
1245 		callout_reset(&seq->xack_timer,  in ng_l2tp_seq_recv_ns()
1247 		seq->xack_timer_running = 1;  in ng_l2tp_seq_recv_ns()
1264 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_seq_xack_timeout()  local
1269 		seq->xack_timer_running = 0;  in ng_l2tp_seq_xack_timeout()
1270 		if (!seq->rack_timer_running) {  in ng_l2tp_seq_xack_timeout()
1282 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_seq_xack_timeout()
1285 	if (seq->xack != seq->nr)  in ng_l2tp_seq_xack_timeout()
1286 		ng_l2tp_xmit_ctrl(priv, NULL, seq->ns);  in ng_l2tp_seq_xack_timeout()
1289 	seq->xack_timer_running = 0;  in ng_l2tp_seq_xack_timeout()
1291 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_seq_xack_timeout()
1304 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_seq_rack_timeout()  local
1311 		seq->rack_timer_running = 0;  in ng_l2tp_seq_rack_timeout()
1312 		if (!seq->xack_timer_running) {  in ng_l2tp_seq_rack_timeout()
1324 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_seq_rack_timeout()
1327 	if (seq->rack == seq->ns) {  in ng_l2tp_seq_rack_timeout()
1328 		seq->rack_timer_running = 0;  in ng_l2tp_seq_rack_timeout()
1335 	if (seq->rexmits++ >= seq->max_rexmits)  in ng_l2tp_seq_rack_timeout()
1339 	delay = (seq->rexmits > 12) ? (1 << 12) : (1 << seq->rexmits);  in ng_l2tp_seq_rack_timeout()
1340 	if (delay > seq->max_rexmit_to)  in ng_l2tp_seq_rack_timeout()
1341 		delay = seq->max_rexmit_to;  in ng_l2tp_seq_rack_timeout()
1342 	callout_reset(&seq->rack_timer,  in ng_l2tp_seq_rack_timeout()
1346 	seq->ssth = (seq->cwnd + 1) / 2;  in ng_l2tp_seq_rack_timeout()
1347 	seq->cwnd = 1;  in ng_l2tp_seq_rack_timeout()
1348 	seq->acks = 0;  in ng_l2tp_seq_rack_timeout()
1351 	if ((m = L2TP_COPY_MBUF(seq->xwin[0], M_NOWAIT)) == NULL)  in ng_l2tp_seq_rack_timeout()
1354 		ng_l2tp_xmit_ctrl(priv, m, seq->rack);  in ng_l2tp_seq_rack_timeout()
1358 	L2TP_SEQ_CHECK(seq);  in ng_l2tp_seq_rack_timeout()
1369 	struct l2tp_seq *const seq = &priv->seq;  in ng_l2tp_xmit_ctrl()  local
1410 	mtod(m, u_int16_t *)[5] = htons(seq->nr);  in ng_l2tp_xmit_ctrl()
1417 	if (seq->xack_timer_running && callout_stop(&seq->xack_timer) == 1) {  in ng_l2tp_xmit_ctrl()
1418 		seq->xack_timer_running = 0;  in ng_l2tp_xmit_ctrl()
1421 	seq->xack = seq->nr;  in ng_l2tp_xmit_ctrl()
1433 ng_l2tp_seq_check(struct l2tp_seq *seq)  in ng_l2tp_seq_check()  argument
1435 	const int self_unack = L2TP_SEQ_DIFF(seq->nr, seq->xack);  in ng_l2tp_seq_check()
1436 	const int peer_unack = L2TP_SEQ_DIFF(seq->ns, seq->rack);  in ng_l2tp_seq_check()
1441 	CHECK(seq->wmax <= L2TP_MAX_XWIN);  in ng_l2tp_seq_check()
1442 	CHECK(seq->cwnd >= 1);  in ng_l2tp_seq_check()
1443 	CHECK(seq->cwnd <= seq->wmax);  in ng_l2tp_seq_check()
1444 	CHECK(seq->ssth >= 1);  in ng_l2tp_seq_check()
1445 	CHECK(seq->ssth <= seq->wmax);  in ng_l2tp_seq_check()
1446 	if (seq->cwnd < seq->ssth)  in ng_l2tp_seq_check()
1447 		CHECK(seq->acks == 0);  in ng_l2tp_seq_check()
1449 		CHECK(seq->acks <= seq->cwnd);  in ng_l2tp_seq_check()
1452 	CHECK(peer_unack <= seq->wmax);  in ng_l2tp_seq_check()
1453 	CHECK((self_unack == 0) ^ seq->xack_timer_running);  in ng_l2tp_seq_check()
1454 	CHECK((peer_unack == 0) ^ seq->rack_timer_running);  in ng_l2tp_seq_check()
1455 	CHECK(seq->rack_timer_running || !callout_pending(&seq->rack_timer));  in ng_l2tp_seq_check()
1456 	CHECK(seq->xack_timer_running || !callout_pending(&seq->xack_timer));  in ng_l2tp_seq_check()
1458 		CHECK(seq->xwin[i] != NULL);  in ng_l2tp_seq_check()
1459 	for ( ; i < seq->cwnd; i++)	    /* verify peer's recv window full */  in ng_l2tp_seq_check()
1460 		CHECK(seq->xwin[i] == NULL);  in ng_l2tp_seq_check()