1 /* $NetBSD: bridgestp.c,v 1.5 2003/11/28 08:56:48 keihan Exp $ */
4 * SPDX-License-Identifier: BSD-2-Clause
6 * Copyright (c) 2000 Jason L. Wright (jason@thought.net)
7 * Copyright (c) 2006 Andrew Thompson (thompsa@FreeBSD.org)
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
25 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
27 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
28 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
31 * OpenBSD: bridgestp.c,v 1.5 2001/03/22 03:48:29 jason Exp
35 * Implementation of the spanning tree protocol as defined in
36 * ISO/IEC 802.1D-2004, June 9, 2004.
39 #include <sys/param.h>
40 #include <sys/systm.h>
42 #include <sys/socket.h>
43 #include <sys/sockio.h>
44 #include <sys/kernel.h>
45 #include <sys/malloc.h>
46 #include <sys/callout.h>
47 #include <sys/module.h>
50 #include <sys/mutex.h>
51 #include <sys/taskqueue.h>
54 #include <net/if_var.h>
55 #include <net/if_private.h>
56 #include <net/if_dl.h>
57 #include <net/if_types.h>
58 #include <net/if_llc.h>
59 #include <net/if_media.h>
62 #include <netinet/in.h>
63 #include <netinet/in_systm.h>
64 #include <netinet/in_var.h>
65 #include <netinet/if_ether.h>
66 #include <net/bridgestp.h>
68 #ifdef BRIDGESTP_DEBUG
69 #define DPRINTF(fmt, arg...) printf("bstp: " fmt, ##arg)
71 #define DPRINTF(fmt, arg...) (void)0
74 #define PV2ADDR(pv, eaddr) do { \
75 eaddr[0] = pv >> 40; \
76 eaddr[1] = pv >> 32; \
77 eaddr[2] = pv >> 24; \
78 eaddr[3] = pv >> 16; \
87 const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
89 LIST_HEAD(, bstp_state) bstp_list;
90 static struct mtx bstp_list_mtx;
92 static void bstp_transmit(struct bstp_state *, struct bstp_port *);
93 static void bstp_transmit_bpdu(struct bstp_state *, struct bstp_port *);
94 static void bstp_transmit_tcn(struct bstp_state *, struct bstp_port *);
95 static void bstp_decode_bpdu(struct bstp_port *, struct bstp_cbpdu *,
96 struct bstp_config_unit *);
97 static void bstp_send_bpdu(struct bstp_state *, struct bstp_port *,
99 static int bstp_pdu_flags(struct bstp_port *);
100 static void bstp_received_stp(struct bstp_state *, struct bstp_port *,
101 struct mbuf **, struct bstp_tbpdu *);
102 static void bstp_received_rstp(struct bstp_state *, struct bstp_port *,
103 struct mbuf **, struct bstp_tbpdu *);
104 static void bstp_received_tcn(struct bstp_state *, struct bstp_port *,
105 struct bstp_tcn_unit *);
106 static void bstp_received_bpdu(struct bstp_state *, struct bstp_port *,
107 struct bstp_config_unit *);
108 static int bstp_pdu_rcvtype(struct bstp_port *, struct bstp_config_unit *);
109 static int bstp_pdu_bettersame(struct bstp_port *, int);
110 static int bstp_info_cmp(struct bstp_pri_vector *,
111 struct bstp_pri_vector *);
112 static int bstp_info_superior(struct bstp_pri_vector *,
113 struct bstp_pri_vector *);
114 static void bstp_assign_roles(struct bstp_state *);
115 static void bstp_update_roles(struct bstp_state *, struct bstp_port *);
116 static void bstp_update_state(struct bstp_state *, struct bstp_port *);
117 static void bstp_update_tc(struct bstp_port *);
118 static void bstp_update_info(struct bstp_port *);
119 static void bstp_set_other_tcprop(struct bstp_port *);
120 static void bstp_set_all_reroot(struct bstp_state *);
121 static void bstp_set_all_sync(struct bstp_state *);
122 static void bstp_set_port_state(struct bstp_port *, int);
123 static void bstp_set_port_role(struct bstp_port *, int);
124 static void bstp_set_port_proto(struct bstp_port *, int);
125 static void bstp_set_port_tc(struct bstp_port *, int);
126 static void bstp_set_timer_tc(struct bstp_port *);
127 static void bstp_set_timer_msgage(struct bstp_port *);
128 static int bstp_rerooted(struct bstp_state *, struct bstp_port *);
129 static uint32_t bstp_calc_path_cost(struct bstp_port *);
130 static void bstp_notify_state(void *, int);
131 static void bstp_notify_rtage(void *, int);
132 static void bstp_ifupdstatus(void *, int);
133 static void bstp_enable_port(struct bstp_state *, struct bstp_port *);
134 static void bstp_disable_port(struct bstp_state *, struct bstp_port *);
135 static void bstp_tick(void *);
136 static void bstp_timer_start(struct bstp_timer *, uint16_t);
137 static void bstp_timer_stop(struct bstp_timer *);
138 static void bstp_timer_latch(struct bstp_timer *);
139 static int bstp_timer_dectest(struct bstp_timer *);
140 static void bstp_hello_timer_expiry(struct bstp_state *,
142 static void bstp_message_age_expiry(struct bstp_state *,
144 static void bstp_migrate_delay_expiry(struct bstp_state *,
146 static void bstp_edge_delay_expiry(struct bstp_state *,
148 static int bstp_addr_cmp(const uint8_t *, const uint8_t *);
149 static int bstp_same_bridgeid(uint64_t, uint64_t);
150 static void bstp_reinit(struct bstp_state *);
153 bstp_transmit(struct bstp_state *bs, struct bstp_port *bp)
157 if (bs->bs_running == 0)
161 * a PDU can only be sent if we have tx quota left and the
162 * hello timer is running.
164 if (bp->bp_hello_timer.active == 0) {
165 /* Test if it needs to be reset */
166 bstp_hello_timer_expiry(bs, bp);
169 if (bp->bp_txcount > bs->bs_txholdcount)
170 /* Ran out of karma */
173 if (bp->bp_protover == BSTP_PROTO_RSTP) {
174 bstp_transmit_bpdu(bs, bp);
177 switch (bp->bp_role) {
178 case BSTP_ROLE_DESIGNATED:
179 bstp_transmit_bpdu(bs, bp);
184 bstp_transmit_tcn(bs, bp);
188 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime);
189 bp->bp_flags &= ~BSTP_PORT_NEWINFO;
193 bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp)
195 struct bstp_cbpdu bpdu;
197 BSTP_LOCK_ASSERT(bs);
199 bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48);
200 PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr);
202 bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost);
204 bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48);
205 PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr);
207 bpdu.cbu_portid = htons(bp->bp_port_id);
208 bpdu.cbu_messageage = htons(bp->bp_desg_msg_age);
209 bpdu.cbu_maxage = htons(bp->bp_desg_max_age);
210 bpdu.cbu_hellotime = htons(bp->bp_desg_htime);
211 bpdu.cbu_forwarddelay = htons(bp->bp_desg_fdelay);
213 bpdu.cbu_flags = bstp_pdu_flags(bp);
215 switch (bp->bp_protover) {
217 bpdu.cbu_bpdutype = BSTP_MSGTYPE_CFG;
220 case BSTP_PROTO_RSTP:
221 bpdu.cbu_bpdutype = BSTP_MSGTYPE_RSTP;
225 bstp_send_bpdu(bs, bp, &bpdu);
229 bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp)
231 struct bstp_tbpdu bpdu;
232 struct ifnet *ifp = bp->bp_ifp;
233 struct ether_header *eh;
236 KASSERT(bp == bs->bs_root_port, ("%s: bad root port\n", __func__));
238 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
241 m = m_gethdr(M_NOWAIT, MT_DATA);
245 m->m_pkthdr.rcvif = ifp;
246 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu);
247 m->m_len = m->m_pkthdr.len;
249 eh = mtod(m, struct ether_header *);
251 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
252 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
253 eh->ether_type = htons(sizeof(bpdu));
255 bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP;
256 bpdu.tbu_ctl = LLC_UI;
257 bpdu.tbu_protoid = 0;
258 bpdu.tbu_protover = 0;
259 bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN;
261 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu));
264 ifp->if_transmit(ifp, m);
268 bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu,
269 struct bstp_config_unit *cu)
273 cu->cu_pv.pv_root_id =
274 (((uint64_t)ntohs(cpdu->cbu_rootpri)) << 48) |
275 (((uint64_t)cpdu->cbu_rootaddr[0]) << 40) |
276 (((uint64_t)cpdu->cbu_rootaddr[1]) << 32) |
277 (((uint64_t)cpdu->cbu_rootaddr[2]) << 24) |
278 (((uint64_t)cpdu->cbu_rootaddr[3]) << 16) |
279 (((uint64_t)cpdu->cbu_rootaddr[4]) << 8) |
280 (((uint64_t)cpdu->cbu_rootaddr[5]) << 0);
282 cu->cu_pv.pv_dbridge_id =
283 (((uint64_t)ntohs(cpdu->cbu_bridgepri)) << 48) |
284 (((uint64_t)cpdu->cbu_bridgeaddr[0]) << 40) |
285 (((uint64_t)cpdu->cbu_bridgeaddr[1]) << 32) |
286 (((uint64_t)cpdu->cbu_bridgeaddr[2]) << 24) |
287 (((uint64_t)cpdu->cbu_bridgeaddr[3]) << 16) |
288 (((uint64_t)cpdu->cbu_bridgeaddr[4]) << 8) |
289 (((uint64_t)cpdu->cbu_bridgeaddr[5]) << 0);
291 cu->cu_pv.pv_cost = ntohl(cpdu->cbu_rootpathcost);
292 cu->cu_message_age = ntohs(cpdu->cbu_messageage);
293 cu->cu_max_age = ntohs(cpdu->cbu_maxage);
294 cu->cu_hello_time = ntohs(cpdu->cbu_hellotime);
295 cu->cu_forward_delay = ntohs(cpdu->cbu_forwarddelay);
296 cu->cu_pv.pv_dport_id = ntohs(cpdu->cbu_portid);
297 cu->cu_pv.pv_port_id = bp->bp_port_id;
298 cu->cu_message_type = cpdu->cbu_bpdutype;
300 /* Strip off unused flags in STP mode */
301 flags = cpdu->cbu_flags;
302 switch (cpdu->cbu_protover) {
304 flags &= BSTP_PDU_STPMASK;
305 /* A STP BPDU explicitly conveys a Designated Port */
306 cu->cu_role = BSTP_ROLE_DESIGNATED;
309 case BSTP_PROTO_RSTP:
310 flags &= BSTP_PDU_RSTPMASK;
314 cu->cu_topology_change_ack =
315 (flags & BSTP_PDU_F_TCA) ? 1 : 0;
317 (flags & BSTP_PDU_F_P) ? 1 : 0;
319 (flags & BSTP_PDU_F_A) ? 1 : 0;
321 (flags & BSTP_PDU_F_L) ? 1 : 0;
323 (flags & BSTP_PDU_F_F) ? 1 : 0;
324 cu->cu_topology_change =
325 (flags & BSTP_PDU_F_TC) ? 1 : 0;
327 switch ((flags & BSTP_PDU_PRMASK) >> BSTP_PDU_PRSHIFT) {
328 case BSTP_PDU_F_ROOT:
329 cu->cu_role = BSTP_ROLE_ROOT;
332 cu->cu_role = BSTP_ROLE_ALTERNATE;
334 case BSTP_PDU_F_DESG:
335 cu->cu_role = BSTP_ROLE_DESIGNATED;
341 bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp,
342 struct bstp_cbpdu *bpdu)
346 struct ether_header *eh;
348 BSTP_LOCK_ASSERT(bs);
353 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
356 m = m_gethdr(M_NOWAIT, MT_DATA);
360 eh = mtod(m, struct ether_header *);
362 bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP;
363 bpdu->cbu_ctl = LLC_UI;
364 bpdu->cbu_protoid = htons(BSTP_PROTO_ID);
366 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
367 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
369 switch (bpdu->cbu_bpdutype) {
370 case BSTP_MSGTYPE_CFG:
371 bpdu->cbu_protover = BSTP_PROTO_STP;
372 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_STP_LEN;
373 eh->ether_type = htons(BSTP_BPDU_STP_LEN);
374 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu,
378 case BSTP_MSGTYPE_RSTP:
379 bpdu->cbu_protover = BSTP_PROTO_RSTP;
380 bpdu->cbu_versionlen = htons(0);
381 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_RSTP_LEN;
382 eh->ether_type = htons(BSTP_BPDU_RSTP_LEN);
383 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu,
388 panic("not implemented");
390 m->m_pkthdr.rcvif = ifp;
391 m->m_len = m->m_pkthdr.len;
394 ifp->if_transmit(ifp, m);
398 bstp_pdu_flags(struct bstp_port *bp)
402 if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING)
403 flags |= BSTP_PDU_F_P;
406 flags |= BSTP_PDU_F_A;
408 if (bp->bp_tc_timer.active)
409 flags |= BSTP_PDU_F_TC;
412 flags |= BSTP_PDU_F_TCA;
414 switch (bp->bp_state) {
415 case BSTP_IFSTATE_LEARNING:
416 flags |= BSTP_PDU_F_L;
419 case BSTP_IFSTATE_FORWARDING:
420 flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F);
424 switch (bp->bp_role) {
427 (BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT);
430 case BSTP_ROLE_ALTERNATE:
431 case BSTP_ROLE_BACKUP: /* fall through */
433 (BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT);
436 case BSTP_ROLE_DESIGNATED:
438 (BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT);
442 /* Strip off unused flags in either mode */
443 switch (bp->bp_protover) {
445 flags &= BSTP_PDU_STPMASK;
447 case BSTP_PROTO_RSTP:
448 flags &= BSTP_PDU_RSTPMASK;
455 bstp_input(struct bstp_port *bp, struct ifnet *ifp, struct mbuf *m)
457 struct bstp_state *bs = bp->bp_bs;
458 struct ether_header *eh;
459 struct bstp_tbpdu tpdu;
462 if (bp->bp_active == 0) {
469 eh = mtod(m, struct ether_header *);
471 len = ntohs(eh->ether_type);
472 if (len < sizeof(tpdu))
475 m_adj(m, ETHER_HDR_LEN);
477 if (m->m_pkthdr.len > len)
478 m_adj(m, len - m->m_pkthdr.len);
479 if (m->m_len < sizeof(tpdu) &&
480 (m = m_pullup(m, sizeof(tpdu))) == NULL)
483 memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu));
485 /* basic packet checks */
486 if (tpdu.tbu_dsap != LLC_8021D_LSAP ||
487 tpdu.tbu_ssap != LLC_8021D_LSAP ||
488 tpdu.tbu_ctl != LLC_UI)
490 if (tpdu.tbu_protoid != BSTP_PROTO_ID)
494 * We can treat later versions of the PDU as the same as the maximum
495 * version we implement. All additional parameters/flags are ignored.
497 if (tpdu.tbu_protover > BSTP_PROTO_MAX)
498 tpdu.tbu_protover = BSTP_PROTO_MAX;
500 if (tpdu.tbu_protover != bp->bp_protover) {
502 * Wait for the migration delay timer to expire before changing
503 * protocol version to avoid flip-flops.
505 if (bp->bp_flags & BSTP_PORT_CANMIGRATE)
506 bstp_set_port_proto(bp, tpdu.tbu_protover);
511 /* Clear operedge upon receiving a PDU on the port */
513 bstp_timer_start(&bp->bp_edge_delay_timer,
514 BSTP_DEFAULT_MIGRATE_DELAY);
516 switch (tpdu.tbu_protover) {
518 bstp_received_stp(bs, bp, &m, &tpdu);
521 case BSTP_PROTO_RSTP:
522 bstp_received_rstp(bs, bp, &m, &tpdu);
532 bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp,
533 struct mbuf **mp, struct bstp_tbpdu *tpdu)
535 struct bstp_cbpdu cpdu;
536 struct bstp_config_unit *cu = &bp->bp_msg_cu;
537 struct bstp_tcn_unit tu;
539 switch (tpdu->tbu_bpdutype) {
540 case BSTP_MSGTYPE_TCN:
541 tu.tu_message_type = tpdu->tbu_bpdutype;
542 bstp_received_tcn(bs, bp, &tu);
544 case BSTP_MSGTYPE_CFG:
545 if ((*mp)->m_len < BSTP_BPDU_STP_LEN &&
546 (*mp = m_pullup(*mp, BSTP_BPDU_STP_LEN)) == NULL)
548 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_STP_LEN);
550 bstp_decode_bpdu(bp, &cpdu, cu);
551 bstp_received_bpdu(bs, bp, cu);
557 bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp,
558 struct mbuf **mp, struct bstp_tbpdu *tpdu)
560 struct bstp_cbpdu cpdu;
561 struct bstp_config_unit *cu = &bp->bp_msg_cu;
563 if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP)
566 if ((*mp)->m_len < BSTP_BPDU_RSTP_LEN &&
567 (*mp = m_pullup(*mp, BSTP_BPDU_RSTP_LEN)) == NULL)
569 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_RSTP_LEN);
571 bstp_decode_bpdu(bp, &cpdu, cu);
572 bstp_received_bpdu(bs, bp, cu);
576 bstp_received_tcn(struct bstp_state *bs, struct bstp_port *bp,
577 struct bstp_tcn_unit *tcn)
584 bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp,
585 struct bstp_config_unit *cu)
589 BSTP_LOCK_ASSERT(bs);
591 /* We need to have transitioned to INFO_MINE before proceeding */
592 switch (bp->bp_infois) {
593 case BSTP_INFO_DISABLED:
599 if (cu->cu_message_age >= cu->cu_max_age) {
602 if (cu->cu_max_age < BSTP_MIN_MAX_AGE ||
603 cu->cu_max_age > BSTP_MAX_MAX_AGE) {
606 if (cu->cu_forward_delay < BSTP_MIN_FORWARD_DELAY ||
607 cu->cu_forward_delay > BSTP_MAX_FORWARD_DELAY) {
610 if (cu->cu_hello_time < BSTP_MIN_HELLO_TIME ||
611 cu->cu_hello_time > BSTP_MAX_HELLO_TIME) {
615 type = bstp_pdu_rcvtype(bp, cu);
618 case BSTP_PDU_SUPERIOR:
619 bs->bs_allsynced = 0;
621 bp->bp_proposing = 0;
623 if (cu->cu_proposal && cu->cu_forwarding == 0)
625 if (cu->cu_topology_change)
627 if (cu->cu_topology_change_ack)
631 !bstp_pdu_bettersame(bp, BSTP_INFO_RECEIVED))
634 /* copy the received priority and timers to the port */
635 bp->bp_port_pv = cu->cu_pv;
636 bp->bp_port_msg_age = cu->cu_message_age;
637 bp->bp_port_max_age = cu->cu_max_age;
638 bp->bp_port_fdelay = cu->cu_forward_delay;
640 (cu->cu_hello_time > BSTP_MIN_HELLO_TIME ?
641 cu->cu_hello_time : BSTP_MIN_HELLO_TIME);
643 /* set expiry for the new info */
644 bstp_set_timer_msgage(bp);
646 bp->bp_infois = BSTP_INFO_RECEIVED;
647 bstp_assign_roles(bs);
650 case BSTP_PDU_REPEATED:
651 if (cu->cu_proposal && cu->cu_forwarding == 0)
653 if (cu->cu_topology_change)
655 if (cu->cu_topology_change_ack)
658 /* rearm the age timer */
659 bstp_set_timer_msgage(bp);
662 case BSTP_PDU_INFERIOR:
663 if (cu->cu_learning) {
665 bp->bp_proposing = 0;
669 case BSTP_PDU_INFERIORALT:
671 * only point to point links are allowed fast
672 * transitions to forwarding.
674 if (cu->cu_agree && bp->bp_ptp_link) {
676 bp->bp_proposing = 0;
680 if (cu->cu_topology_change)
682 if (cu->cu_topology_change_ack)
687 return; /* do nothing */
689 /* update the state machines with the new data */
690 bstp_update_state(bs, bp);
694 bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu)
698 /* default return type */
699 type = BSTP_PDU_OTHER;
701 switch (cu->cu_role) {
702 case BSTP_ROLE_DESIGNATED:
703 if (bstp_info_superior(&bp->bp_port_pv, &cu->cu_pv))
704 /* bpdu priority is superior */
705 type = BSTP_PDU_SUPERIOR;
706 else if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) ==
708 if (bp->bp_port_msg_age != cu->cu_message_age ||
709 bp->bp_port_max_age != cu->cu_max_age ||
710 bp->bp_port_fdelay != cu->cu_forward_delay ||
711 bp->bp_port_htime != cu->cu_hello_time)
712 /* bpdu priority is equal and timers differ */
713 type = BSTP_PDU_SUPERIOR;
716 type = BSTP_PDU_REPEATED;
718 /* bpdu priority is worse */
719 type = BSTP_PDU_INFERIOR;
724 case BSTP_ROLE_ALTERNATE:
725 case BSTP_ROLE_BACKUP:
726 if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) <= INFO_SAME)
728 * not a designated port and priority is the same or
731 type = BSTP_PDU_INFERIORALT;
739 bstp_pdu_bettersame(struct bstp_port *bp, int newinfo)
741 if (newinfo == BSTP_INFO_RECEIVED &&
742 bp->bp_infois == BSTP_INFO_RECEIVED &&
743 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME)
746 if (newinfo == BSTP_INFO_MINE &&
747 bp->bp_infois == BSTP_INFO_MINE &&
748 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) >= INFO_SAME)
755 bstp_info_cmp(struct bstp_pri_vector *pv,
756 struct bstp_pri_vector *cpv)
758 if (cpv->pv_root_id < pv->pv_root_id)
759 return (INFO_BETTER);
760 if (cpv->pv_root_id > pv->pv_root_id)
763 if (cpv->pv_cost < pv->pv_cost)
764 return (INFO_BETTER);
765 if (cpv->pv_cost > pv->pv_cost)
768 if (cpv->pv_dbridge_id < pv->pv_dbridge_id)
769 return (INFO_BETTER);
770 if (cpv->pv_dbridge_id > pv->pv_dbridge_id)
773 if (cpv->pv_dport_id < pv->pv_dport_id)
774 return (INFO_BETTER);
775 if (cpv->pv_dport_id > pv->pv_dport_id)
782 * This message priority vector is superior to the port priority vector and
783 * will replace it if, and only if, the message priority vector is better than
784 * the port priority vector, or the message has been transmitted from the same
785 * designated bridge and designated port as the port priority vector.
788 bstp_info_superior(struct bstp_pri_vector *pv,
789 struct bstp_pri_vector *cpv)
791 if (bstp_info_cmp(pv, cpv) == INFO_BETTER ||
792 (bstp_same_bridgeid(pv->pv_dbridge_id, cpv->pv_dbridge_id) &&
793 (cpv->pv_dport_id & 0xfff) == (pv->pv_dport_id & 0xfff)))
799 bstp_assign_roles(struct bstp_state *bs)
801 struct bstp_port *bp, *rbp = NULL;
802 struct bstp_pri_vector pv;
804 /* default to our priority vector */
805 bs->bs_root_pv = bs->bs_bridge_pv;
806 bs->bs_root_msg_age = 0;
807 bs->bs_root_max_age = bs->bs_bridge_max_age;
808 bs->bs_root_fdelay = bs->bs_bridge_fdelay;
809 bs->bs_root_htime = bs->bs_bridge_htime;
810 bs->bs_root_port = NULL;
812 /* check if any received info supersedes us */
813 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
814 if (bp->bp_infois != BSTP_INFO_RECEIVED)
818 pv.pv_cost += bp->bp_path_cost;
821 * The root priority vector is the best of the set comprising
822 * the bridge priority vector plus all root path priority
823 * vectors whose bridge address is not equal to us.
825 if (bstp_same_bridgeid(pv.pv_dbridge_id,
826 bs->bs_bridge_pv.pv_dbridge_id) == 0 &&
827 bstp_info_cmp(&bs->bs_root_pv, &pv) == INFO_BETTER) {
828 /* the port vector replaces the root */
830 bs->bs_root_msg_age = bp->bp_port_msg_age +
831 BSTP_MESSAGE_AGE_INCR;
832 bs->bs_root_max_age = bp->bp_port_max_age;
833 bs->bs_root_fdelay = bp->bp_port_fdelay;
834 bs->bs_root_htime = bp->bp_port_htime;
839 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
840 /* calculate the port designated vector */
841 bp->bp_desg_pv.pv_root_id = bs->bs_root_pv.pv_root_id;
842 bp->bp_desg_pv.pv_cost = bs->bs_root_pv.pv_cost;
843 bp->bp_desg_pv.pv_dbridge_id = bs->bs_bridge_pv.pv_dbridge_id;
844 bp->bp_desg_pv.pv_dport_id = bp->bp_port_id;
845 bp->bp_desg_pv.pv_port_id = bp->bp_port_id;
847 /* calculate designated times */
848 bp->bp_desg_msg_age = bs->bs_root_msg_age;
849 bp->bp_desg_max_age = bs->bs_root_max_age;
850 bp->bp_desg_fdelay = bs->bs_root_fdelay;
851 bp->bp_desg_htime = bs->bs_bridge_htime;
853 switch (bp->bp_infois) {
854 case BSTP_INFO_DISABLED:
855 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
859 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
860 bstp_update_info(bp);
864 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
865 /* update the port info if stale */
866 if (bstp_info_cmp(&bp->bp_port_pv,
867 &bp->bp_desg_pv) != INFO_SAME ||
869 (bp->bp_port_msg_age != rbp->bp_port_msg_age ||
870 bp->bp_port_max_age != rbp->bp_port_max_age ||
871 bp->bp_port_fdelay != rbp->bp_port_fdelay ||
872 bp->bp_port_htime != rbp->bp_port_htime)))
873 bstp_update_info(bp);
876 case BSTP_INFO_RECEIVED:
879 * root priority is derived from this
880 * port, make it the root port.
882 bstp_set_port_role(bp, BSTP_ROLE_ROOT);
883 bs->bs_root_port = bp;
884 } else if (bstp_info_cmp(&bp->bp_port_pv,
885 &bp->bp_desg_pv) == INFO_BETTER) {
887 * the port priority is lower than the root
890 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
891 bstp_update_info(bp);
893 if (bstp_same_bridgeid(
894 bp->bp_port_pv.pv_dbridge_id,
895 bs->bs_bridge_pv.pv_dbridge_id)) {
897 * the designated bridge refers to
898 * another port on this bridge.
900 bstp_set_port_role(bp,
904 * the port is an inferior path to the
907 bstp_set_port_role(bp,
908 BSTP_ROLE_ALTERNATE);
917 bstp_update_state(struct bstp_state *bs, struct bstp_port *bp)
919 struct bstp_port *bp2;
922 BSTP_LOCK_ASSERT(bs);
924 /* check if all the ports have syncronised again */
925 if (!bs->bs_allsynced) {
927 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
928 if (!(bp2->bp_synced ||
929 bp2->bp_role == BSTP_ROLE_ROOT)) {
934 bs->bs_allsynced = synced;
937 bstp_update_roles(bs, bp);
942 bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp)
946 switch (bp->bp_role) {
947 case BSTP_ROLE_DISABLED:
948 /* Clear any flags if set */
949 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) {
956 case BSTP_ROLE_ALTERNATE:
957 case BSTP_ROLE_BACKUP:
958 if ((bs->bs_allsynced && !bp->bp_agree) ||
959 (bp->bp_proposed && bp->bp_agree)) {
962 bp->bp_flags |= BSTP_PORT_NEWINFO;
963 DPRINTF("%s -> ALTERNATE_AGREED\n",
964 bp->bp_ifp->if_xname);
967 if (bp->bp_proposed && !bp->bp_agree) {
968 bstp_set_all_sync(bs);
970 DPRINTF("%s -> ALTERNATE_PROPOSED\n",
971 bp->bp_ifp->if_xname);
974 /* Clear any flags if set */
975 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) {
979 DPRINTF("%s -> ALTERNATE_PORT\n", bp->bp_ifp->if_xname);
984 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) {
985 bstp_set_all_reroot(bs);
986 DPRINTF("%s -> ROOT_REROOT\n", bp->bp_ifp->if_xname);
989 if ((bs->bs_allsynced && !bp->bp_agree) ||
990 (bp->bp_proposed && bp->bp_agree)) {
994 bp->bp_flags |= BSTP_PORT_NEWINFO;
995 DPRINTF("%s -> ROOT_AGREED\n", bp->bp_ifp->if_xname);
998 if (bp->bp_proposed && !bp->bp_agree) {
999 bstp_set_all_sync(bs);
1000 bp->bp_proposed = 0;
1001 DPRINTF("%s -> ROOT_PROPOSED\n", bp->bp_ifp->if_xname);
1004 if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
1005 (bp->bp_forward_delay_timer.active == 0 ||
1006 (bstp_rerooted(bs, bp) &&
1007 bp->bp_recent_backup_timer.active == 0 &&
1008 bp->bp_protover == BSTP_PROTO_RSTP))) {
1009 switch (bp->bp_state) {
1010 case BSTP_IFSTATE_DISCARDING:
1011 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING);
1013 case BSTP_IFSTATE_LEARNING:
1014 bstp_set_port_state(bp,
1015 BSTP_IFSTATE_FORWARDING);
1020 if (bp->bp_state == BSTP_IFSTATE_FORWARDING && bp->bp_reroot) {
1022 DPRINTF("%s -> ROOT_REROOTED\n", bp->bp_ifp->if_xname);
1026 case BSTP_ROLE_DESIGNATED:
1027 if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) {
1029 DPRINTF("%s -> DESIGNATED_RETIRED\n",
1030 bp->bp_ifp->if_xname);
1033 if ((bp->bp_state == BSTP_IFSTATE_DISCARDING &&
1034 !bp->bp_synced) || (bp->bp_agreed && !bp->bp_synced) ||
1035 (bp->bp_operedge && !bp->bp_synced) ||
1036 (bp->bp_sync && bp->bp_synced)) {
1037 bstp_timer_stop(&bp->bp_recent_root_timer);
1040 DPRINTF("%s -> DESIGNATED_SYNCED\n",
1041 bp->bp_ifp->if_xname);
1044 if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
1045 !bp->bp_agreed && !bp->bp_proposing &&
1047 bp->bp_proposing = 1;
1048 bp->bp_flags |= BSTP_PORT_NEWINFO;
1049 bstp_timer_start(&bp->bp_edge_delay_timer,
1050 (bp->bp_ptp_link ? BSTP_DEFAULT_MIGRATE_DELAY :
1051 bp->bp_desg_max_age));
1052 DPRINTF("%s -> DESIGNATED_PROPOSE\n",
1053 bp->bp_ifp->if_xname);
1056 if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
1057 (bp->bp_forward_delay_timer.active == 0 || bp->bp_agreed ||
1059 (bp->bp_recent_root_timer.active == 0 || !bp->bp_reroot) &&
1062 DPRINTF("%s -> AGREED\n", bp->bp_ifp->if_xname);
1064 * If agreed|operedge then go straight to forwarding,
1065 * otherwise follow discard -> learn -> forward.
1067 if (bp->bp_agreed || bp->bp_operedge ||
1068 bp->bp_state == BSTP_IFSTATE_LEARNING) {
1069 bstp_set_port_state(bp,
1070 BSTP_IFSTATE_FORWARDING);
1071 bp->bp_agreed = bp->bp_protover;
1072 } else if (bp->bp_state == BSTP_IFSTATE_DISCARDING)
1073 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING);
1076 if (((bp->bp_sync && !bp->bp_synced) ||
1077 (bp->bp_reroot && bp->bp_recent_root_timer.active) ||
1078 (bp->bp_flags & BSTP_PORT_DISPUTED)) && !bp->bp_operedge &&
1079 bp->bp_state != BSTP_IFSTATE_DISCARDING) {
1080 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
1081 bp->bp_flags &= ~BSTP_PORT_DISPUTED;
1082 bstp_timer_start(&bp->bp_forward_delay_timer,
1083 bp->bp_protover == BSTP_PROTO_RSTP ?
1084 bp->bp_desg_htime : bp->bp_desg_fdelay);
1085 DPRINTF("%s -> DESIGNATED_DISCARD\n",
1086 bp->bp_ifp->if_xname);
1091 if (bp->bp_flags & BSTP_PORT_NEWINFO)
1092 bstp_transmit(bs, bp);
1096 bstp_update_tc(struct bstp_port *bp)
1098 switch (bp->bp_tcstate) {
1099 case BSTP_TCSTATE_ACTIVE:
1100 if ((bp->bp_role != BSTP_ROLE_DESIGNATED &&
1101 bp->bp_role != BSTP_ROLE_ROOT) || bp->bp_operedge)
1102 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
1105 bstp_set_port_tc(bp, BSTP_TCSTATE_TCN);
1107 bstp_set_port_tc(bp, BSTP_TCSTATE_TC);
1109 if (bp->bp_tc_prop && !bp->bp_operedge)
1110 bstp_set_port_tc(bp, BSTP_TCSTATE_PROPAG);
1113 bstp_set_port_tc(bp, BSTP_TCSTATE_ACK);
1116 case BSTP_TCSTATE_INACTIVE:
1117 if ((bp->bp_state == BSTP_IFSTATE_LEARNING ||
1118 bp->bp_state == BSTP_IFSTATE_FORWARDING) &&
1119 bp->bp_fdbflush == 0)
1120 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
1123 case BSTP_TCSTATE_LEARNING:
1124 if (bp->bp_rcvdtc || bp->bp_rcvdtcn || bp->bp_rcvdtca ||
1126 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
1127 else if (bp->bp_role != BSTP_ROLE_DESIGNATED &&
1128 bp->bp_role != BSTP_ROLE_ROOT &&
1129 bp->bp_state == BSTP_IFSTATE_DISCARDING)
1130 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
1132 if ((bp->bp_role == BSTP_ROLE_DESIGNATED ||
1133 bp->bp_role == BSTP_ROLE_ROOT) &&
1134 bp->bp_state == BSTP_IFSTATE_FORWARDING &&
1136 bstp_set_port_tc(bp, BSTP_TCSTATE_DETECTED);
1139 /* these are transient states and go straight back to ACTIVE */
1140 case BSTP_TCSTATE_DETECTED:
1141 case BSTP_TCSTATE_TCN:
1142 case BSTP_TCSTATE_TC:
1143 case BSTP_TCSTATE_PROPAG:
1144 case BSTP_TCSTATE_ACK:
1145 DPRINTF("Invalid TC state for %s\n",
1146 bp->bp_ifp->if_xname);
1153 bstp_update_info(struct bstp_port *bp)
1155 struct bstp_state *bs = bp->bp_bs;
1157 bp->bp_proposing = 0;
1158 bp->bp_proposed = 0;
1160 if (bp->bp_agreed && !bstp_pdu_bettersame(bp, BSTP_INFO_MINE))
1163 if (bp->bp_synced && !bp->bp_agreed) {
1165 bs->bs_allsynced = 0;
1168 /* copy the designated pv to the port */
1169 bp->bp_port_pv = bp->bp_desg_pv;
1170 bp->bp_port_msg_age = bp->bp_desg_msg_age;
1171 bp->bp_port_max_age = bp->bp_desg_max_age;
1172 bp->bp_port_fdelay = bp->bp_desg_fdelay;
1173 bp->bp_port_htime = bp->bp_desg_htime;
1174 bp->bp_infois = BSTP_INFO_MINE;
1176 /* Set transmit flag but do not immediately send */
1177 bp->bp_flags |= BSTP_PORT_NEWINFO;
1180 /* set tcprop on every port other than the caller */
1182 bstp_set_other_tcprop(struct bstp_port *bp)
1184 struct bstp_state *bs = bp->bp_bs;
1185 struct bstp_port *bp2;
1187 BSTP_LOCK_ASSERT(bs);
1189 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
1192 bp2->bp_tc_prop = 1;
1197 bstp_set_all_reroot(struct bstp_state *bs)
1199 struct bstp_port *bp;
1201 BSTP_LOCK_ASSERT(bs);
1203 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
1208 bstp_set_all_sync(struct bstp_state *bs)
1210 struct bstp_port *bp;
1212 BSTP_LOCK_ASSERT(bs);
1214 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1216 bp->bp_synced = 0; /* Not explicit in spec */
1219 bs->bs_allsynced = 0;
1223 bstp_set_port_state(struct bstp_port *bp, int state)
1225 if (bp->bp_state == state)
1228 bp->bp_state = state;
1230 switch (bp->bp_state) {
1231 case BSTP_IFSTATE_DISCARDING:
1232 DPRINTF("state changed to DISCARDING on %s\n",
1233 bp->bp_ifp->if_xname);
1236 case BSTP_IFSTATE_LEARNING:
1237 DPRINTF("state changed to LEARNING on %s\n",
1238 bp->bp_ifp->if_xname);
1240 bstp_timer_start(&bp->bp_forward_delay_timer,
1241 bp->bp_protover == BSTP_PROTO_RSTP ?
1242 bp->bp_desg_htime : bp->bp_desg_fdelay);
1245 case BSTP_IFSTATE_FORWARDING:
1246 DPRINTF("state changed to FORWARDING on %s\n",
1247 bp->bp_ifp->if_xname);
1249 bstp_timer_stop(&bp->bp_forward_delay_timer);
1250 /* Record that we enabled forwarding */
1251 bp->bp_forward_transitions++;
1255 /* notify the parent bridge */
1256 taskqueue_enqueue(taskqueue_swi, &bp->bp_statetask);
1260 bstp_set_port_role(struct bstp_port *bp, int role)
1262 struct bstp_state *bs = bp->bp_bs;
1264 if (bp->bp_role == role)
1267 /* perform pre-change tasks */
1268 switch (bp->bp_role) {
1269 case BSTP_ROLE_DISABLED:
1270 bstp_timer_start(&bp->bp_forward_delay_timer,
1271 bp->bp_desg_max_age);
1274 case BSTP_ROLE_BACKUP:
1275 bstp_timer_start(&bp->bp_recent_backup_timer,
1276 bp->bp_desg_htime * 2);
1278 case BSTP_ROLE_ALTERNATE:
1279 bstp_timer_start(&bp->bp_forward_delay_timer,
1280 bp->bp_desg_fdelay);
1286 case BSTP_ROLE_ROOT:
1287 bstp_timer_start(&bp->bp_recent_root_timer,
1288 BSTP_DEFAULT_FORWARD_DELAY);
1293 /* clear values not carried between roles */
1294 bp->bp_proposing = 0;
1295 bs->bs_allsynced = 0;
1297 /* initialise the new role */
1298 switch (bp->bp_role) {
1299 case BSTP_ROLE_DISABLED:
1300 case BSTP_ROLE_ALTERNATE:
1301 case BSTP_ROLE_BACKUP:
1302 DPRINTF("%s role -> ALT/BACK/DISABLED\n",
1303 bp->bp_ifp->if_xname);
1304 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
1305 bstp_timer_stop(&bp->bp_recent_root_timer);
1306 bstp_timer_latch(&bp->bp_forward_delay_timer);
1312 case BSTP_ROLE_ROOT:
1313 DPRINTF("%s role -> ROOT\n",
1314 bp->bp_ifp->if_xname);
1315 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
1316 bstp_timer_latch(&bp->bp_recent_root_timer);
1317 bp->bp_proposing = 0;
1320 case BSTP_ROLE_DESIGNATED:
1321 DPRINTF("%s role -> DESIGNATED\n",
1322 bp->bp_ifp->if_xname);
1323 bstp_timer_start(&bp->bp_hello_timer,
1329 /* let the TC state know that the role changed */
1334 bstp_set_port_proto(struct bstp_port *bp, int proto)
1336 struct bstp_state *bs = bp->bp_bs;
1338 /* supported protocol versions */
1340 case BSTP_PROTO_STP:
1341 /* we can downgrade protocols only */
1342 bstp_timer_stop(&bp->bp_migrate_delay_timer);
1343 /* clear unsupported features */
1344 bp->bp_operedge = 0;
1345 /* STP compat mode only uses 16 bits of the 32 */
1346 if (bp->bp_path_cost > 65535)
1347 bp->bp_path_cost = 65535;
1350 case BSTP_PROTO_RSTP:
1351 bstp_timer_start(&bp->bp_migrate_delay_timer,
1352 bs->bs_migration_delay);
1356 DPRINTF("Unsupported STP version %d\n", proto);
1360 bp->bp_protover = proto;
1361 bp->bp_flags &= ~BSTP_PORT_CANMIGRATE;
1365 bstp_set_port_tc(struct bstp_port *bp, int state)
1367 struct bstp_state *bs = bp->bp_bs;
1369 bp->bp_tcstate = state;
1371 /* initialise the new state */
1372 switch (bp->bp_tcstate) {
1373 case BSTP_TCSTATE_ACTIVE:
1374 DPRINTF("%s -> TC_ACTIVE\n", bp->bp_ifp->if_xname);
1378 case BSTP_TCSTATE_INACTIVE:
1379 bstp_timer_stop(&bp->bp_tc_timer);
1380 /* flush routes on the parent bridge */
1381 bp->bp_fdbflush = 1;
1382 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask);
1384 DPRINTF("%s -> TC_INACTIVE\n", bp->bp_ifp->if_xname);
1387 case BSTP_TCSTATE_LEARNING:
1392 DPRINTF("%s -> TC_LEARNING\n", bp->bp_ifp->if_xname);
1395 case BSTP_TCSTATE_DETECTED:
1396 bstp_set_timer_tc(bp);
1397 bstp_set_other_tcprop(bp);
1398 /* send out notification */
1399 bp->bp_flags |= BSTP_PORT_NEWINFO;
1400 bstp_transmit(bs, bp);
1401 getmicrotime(&bs->bs_last_tc_time);
1402 DPRINTF("%s -> TC_DETECTED\n", bp->bp_ifp->if_xname);
1403 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1406 case BSTP_TCSTATE_TCN:
1407 bstp_set_timer_tc(bp);
1408 DPRINTF("%s -> TC_TCN\n", bp->bp_ifp->if_xname);
1410 case BSTP_TCSTATE_TC:
1413 if (bp->bp_role == BSTP_ROLE_DESIGNATED)
1416 bstp_set_other_tcprop(bp);
1417 DPRINTF("%s -> TC_TC\n", bp->bp_ifp->if_xname);
1418 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1421 case BSTP_TCSTATE_PROPAG:
1422 /* flush routes on the parent bridge */
1423 bp->bp_fdbflush = 1;
1424 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask);
1426 bstp_set_timer_tc(bp);
1427 DPRINTF("%s -> TC_PROPAG\n", bp->bp_ifp->if_xname);
1428 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1431 case BSTP_TCSTATE_ACK:
1432 bstp_timer_stop(&bp->bp_tc_timer);
1434 DPRINTF("%s -> TC_ACK\n", bp->bp_ifp->if_xname);
1435 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1441 bstp_set_timer_tc(struct bstp_port *bp)
1443 struct bstp_state *bs = bp->bp_bs;
1445 if (bp->bp_tc_timer.active)
1448 switch (bp->bp_protover) {
1449 case BSTP_PROTO_RSTP:
1450 bstp_timer_start(&bp->bp_tc_timer,
1451 bp->bp_desg_htime + BSTP_TICK_VAL);
1452 bp->bp_flags |= BSTP_PORT_NEWINFO;
1455 case BSTP_PROTO_STP:
1456 bstp_timer_start(&bp->bp_tc_timer,
1457 bs->bs_root_max_age + bs->bs_root_fdelay);
1463 bstp_set_timer_msgage(struct bstp_port *bp)
1465 if (bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR <=
1466 bp->bp_port_max_age) {
1467 bstp_timer_start(&bp->bp_message_age_timer,
1468 bp->bp_port_htime * 3);
1470 /* expires immediately */
1471 bstp_timer_start(&bp->bp_message_age_timer, 0);
1475 bstp_rerooted(struct bstp_state *bs, struct bstp_port *bp)
1477 struct bstp_port *bp2;
1480 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
1483 if (bp2->bp_recent_root_timer.active) {
1492 bstp_set_htime(struct bstp_state *bs, int t)
1494 /* convert seconds to ticks */
1497 /* value can only be changed in leagacy stp mode */
1498 if (bs->bs_protover != BSTP_PROTO_STP)
1501 if (t < BSTP_MIN_HELLO_TIME || t > BSTP_MAX_HELLO_TIME)
1505 bs->bs_bridge_htime = t;
1512 bstp_set_fdelay(struct bstp_state *bs, int t)
1514 /* convert seconds to ticks */
1517 if (t < BSTP_MIN_FORWARD_DELAY || t > BSTP_MAX_FORWARD_DELAY)
1521 bs->bs_bridge_fdelay = t;
1528 bstp_set_maxage(struct bstp_state *bs, int t)
1530 /* convert seconds to ticks */
1533 if (t < BSTP_MIN_MAX_AGE || t > BSTP_MAX_MAX_AGE)
1537 bs->bs_bridge_max_age = t;
1544 bstp_set_holdcount(struct bstp_state *bs, int count)
1546 struct bstp_port *bp;
1548 if (count < BSTP_MIN_HOLD_COUNT ||
1549 count > BSTP_MAX_HOLD_COUNT)
1553 bs->bs_txholdcount = count;
1554 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
1561 bstp_set_protocol(struct bstp_state *bs, int proto)
1563 struct bstp_port *bp;
1566 /* Supported protocol versions */
1567 case BSTP_PROTO_STP:
1568 case BSTP_PROTO_RSTP:
1576 bs->bs_protover = proto;
1577 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME;
1578 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1580 bp->bp_infois = BSTP_INFO_DISABLED;
1582 bstp_set_port_proto(bp, bs->bs_protover);
1583 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
1584 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
1585 bstp_timer_stop(&bp->bp_recent_backup_timer);
1593 bstp_set_priority(struct bstp_state *bs, int pri)
1595 if (pri < 0 || pri > BSTP_MAX_PRIORITY)
1598 /* Limit to steps of 4096 */
1602 bs->bs_bridge_priority = pri;
1609 bstp_set_port_priority(struct bstp_port *bp, int pri)
1611 struct bstp_state *bs = bp->bp_bs;
1613 if (pri < 0 || pri > BSTP_MAX_PORT_PRIORITY)
1616 /* Limit to steps of 16 */
1620 bp->bp_priority = pri;
1627 bstp_set_path_cost(struct bstp_port *bp, uint32_t path_cost)
1629 struct bstp_state *bs = bp->bp_bs;
1631 if (path_cost > BSTP_MAX_PATH_COST)
1634 /* STP compat mode only uses 16 bits of the 32 */
1635 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535)
1640 if (path_cost == 0) { /* use auto */
1641 bp->bp_flags &= ~BSTP_PORT_ADMCOST;
1642 bp->bp_path_cost = bstp_calc_path_cost(bp);
1644 bp->bp_path_cost = path_cost;
1645 bp->bp_flags |= BSTP_PORT_ADMCOST;
1653 bstp_set_edge(struct bstp_port *bp, int set)
1655 struct bstp_state *bs = bp->bp_bs;
1658 if ((bp->bp_operedge = set) == 0)
1659 bp->bp_flags &= ~BSTP_PORT_ADMEDGE;
1661 bp->bp_flags |= BSTP_PORT_ADMEDGE;
1667 bstp_set_autoedge(struct bstp_port *bp, int set)
1669 struct bstp_state *bs = bp->bp_bs;
1673 bp->bp_flags |= BSTP_PORT_AUTOEDGE;
1674 /* we may be able to transition straight to edge */
1675 if (bp->bp_edge_delay_timer.active == 0)
1676 bstp_edge_delay_expiry(bs, bp);
1678 bp->bp_flags &= ~BSTP_PORT_AUTOEDGE;
1684 bstp_set_ptp(struct bstp_port *bp, int set)
1686 struct bstp_state *bs = bp->bp_bs;
1689 bp->bp_ptp_link = set;
1695 bstp_set_autoptp(struct bstp_port *bp, int set)
1697 struct bstp_state *bs = bp->bp_bs;
1701 bp->bp_flags |= BSTP_PORT_AUTOPTP;
1702 if (bp->bp_role != BSTP_ROLE_DISABLED)
1703 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask);
1705 bp->bp_flags &= ~BSTP_PORT_AUTOPTP;
1711 * Calculate the path cost according to the link speed.
1714 bstp_calc_path_cost(struct bstp_port *bp)
1716 struct ifnet *ifp = bp->bp_ifp;
1719 /* If the priority has been manually set then retain the value */
1720 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1721 return bp->bp_path_cost;
1723 if (ifp->if_link_state == LINK_STATE_DOWN) {
1724 /* Recalc when the link comes up again */
1725 bp->bp_flags |= BSTP_PORT_PNDCOST;
1726 return (BSTP_DEFAULT_PATH_COST);
1729 if (ifp->if_baudrate < 1000)
1730 return (BSTP_DEFAULT_PATH_COST);
1732 /* formula from section 17.14, IEEE Std 802.1D-2004 */
1733 path_cost = 20000000000ULL / (ifp->if_baudrate / 1000);
1735 if (path_cost > BSTP_MAX_PATH_COST)
1736 path_cost = BSTP_MAX_PATH_COST;
1738 /* STP compat mode only uses 16 bits of the 32 */
1739 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535)
1746 * Notify the bridge that a port state has changed, we need to do this from a
1747 * taskqueue to avoid a LOR.
1750 bstp_notify_state(void *arg, int pending)
1752 struct bstp_port *bp = (struct bstp_port *)arg;
1753 struct bstp_state *bs = bp->bp_bs;
1755 if (bp->bp_active == 1 && bs->bs_state_cb != NULL)
1756 (*bs->bs_state_cb)(bp->bp_ifp, bp->bp_state);
1760 * Flush the routes on the bridge port, we need to do this from a
1761 * taskqueue to avoid a LOR.
1764 bstp_notify_rtage(void *arg, int pending)
1766 struct bstp_port *bp = (struct bstp_port *)arg;
1767 struct bstp_state *bs = bp->bp_bs;
1771 switch (bp->bp_protover) {
1772 case BSTP_PROTO_STP:
1773 /* convert to seconds */
1774 age = bp->bp_desg_fdelay / BSTP_TICK_VAL;
1777 case BSTP_PROTO_RSTP:
1783 if (bp->bp_active == 1 && bs->bs_rtage_cb != NULL)
1784 (*bs->bs_rtage_cb)(bp->bp_ifp, age);
1786 /* flush is complete */
1788 bp->bp_fdbflush = 0;
1793 bstp_linkstate(struct bstp_port *bp)
1795 struct bstp_state *bs = bp->bp_bs;
1800 bstp_ifupdstatus(bp, 0);
1802 bstp_update_state(bs, bp);
1807 bstp_ifupdstatus(void *arg, int pending)
1809 struct bstp_port *bp = (struct bstp_port *)arg;
1810 struct bstp_state *bs = bp->bp_bs;
1811 struct ifnet *ifp = bp->bp_ifp;
1812 struct ifmediareq ifmr;
1818 bzero((char *)&ifmr, sizeof(ifmr));
1819 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
1823 if ((error == 0) && (ifp->if_flags & IFF_UP)) {
1824 if (ifmr.ifm_status & IFM_ACTIVE) {
1825 /* A full-duplex link is assumed to be point to point */
1826 if (bp->bp_flags & BSTP_PORT_AUTOPTP) {
1829 fdx = ifmr.ifm_active & IFM_FDX ? 1 : 0;
1830 if (bp->bp_ptp_link ^ fdx) {
1831 bp->bp_ptp_link = fdx;
1836 /* Calc the cost if the link was down previously */
1837 if (bp->bp_flags & BSTP_PORT_PNDCOST) {
1840 cost = bstp_calc_path_cost(bp);
1841 if (bp->bp_path_cost != cost) {
1842 bp->bp_path_cost = cost;
1845 bp->bp_flags &= ~BSTP_PORT_PNDCOST;
1848 if (bp->bp_role == BSTP_ROLE_DISABLED) {
1849 bstp_enable_port(bs, bp);
1853 if (bp->bp_role != BSTP_ROLE_DISABLED) {
1854 bstp_disable_port(bs, bp);
1856 if ((bp->bp_flags & BSTP_PORT_ADMEDGE) &&
1857 bp->bp_protover == BSTP_PROTO_RSTP)
1858 bp->bp_operedge = 1;
1861 } else if (bp->bp_infois != BSTP_INFO_DISABLED) {
1862 bstp_disable_port(bs, bp);
1866 bstp_assign_roles(bs);
1871 bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp)
1873 bp->bp_infois = BSTP_INFO_AGED;
1877 bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp)
1879 bp->bp_infois = BSTP_INFO_DISABLED;
1883 bstp_tick(void *arg)
1885 struct epoch_tracker et;
1886 struct bstp_state *bs = arg;
1887 struct bstp_port *bp;
1889 BSTP_LOCK_ASSERT(bs);
1891 if (bs->bs_running == 0)
1894 NET_EPOCH_ENTER(et);
1895 CURVNET_SET(bs->bs_vnet);
1897 /* poll link events on interfaces that do not support linkstate */
1898 if (bstp_timer_dectest(&bs->bs_link_timer)) {
1899 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1900 if (!(bp->bp_ifp->if_capabilities & IFCAP_LINKSTATE))
1901 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask);
1903 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER);
1906 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1907 /* no events need to happen for these */
1908 bstp_timer_dectest(&bp->bp_tc_timer);
1909 bstp_timer_dectest(&bp->bp_recent_root_timer);
1910 bstp_timer_dectest(&bp->bp_forward_delay_timer);
1911 bstp_timer_dectest(&bp->bp_recent_backup_timer);
1913 if (bstp_timer_dectest(&bp->bp_hello_timer))
1914 bstp_hello_timer_expiry(bs, bp);
1916 if (bstp_timer_dectest(&bp->bp_message_age_timer))
1917 bstp_message_age_expiry(bs, bp);
1919 if (bstp_timer_dectest(&bp->bp_migrate_delay_timer))
1920 bstp_migrate_delay_expiry(bs, bp);
1922 if (bstp_timer_dectest(&bp->bp_edge_delay_timer))
1923 bstp_edge_delay_expiry(bs, bp);
1925 /* update the various state machines for the port */
1926 bstp_update_state(bs, bp);
1928 if (bp->bp_txcount > 0)
1935 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs);
1939 bstp_timer_start(struct bstp_timer *t, uint16_t v)
1947 bstp_timer_stop(struct bstp_timer *t)
1955 bstp_timer_latch(struct bstp_timer *t)
1962 bstp_timer_dectest(struct bstp_timer *t)
1964 if (t->active == 0 || t->latched)
1966 t->value -= BSTP_TICK_VAL;
1967 if (t->value <= 0) {
1975 bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp)
1977 if ((bp->bp_flags & BSTP_PORT_NEWINFO) ||
1978 bp->bp_role == BSTP_ROLE_DESIGNATED ||
1979 (bp->bp_role == BSTP_ROLE_ROOT &&
1980 bp->bp_tc_timer.active == 1)) {
1981 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime);
1982 bp->bp_flags |= BSTP_PORT_NEWINFO;
1983 bstp_transmit(bs, bp);
1988 bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp)
1990 if (bp->bp_infois == BSTP_INFO_RECEIVED) {
1991 bp->bp_infois = BSTP_INFO_AGED;
1992 bstp_assign_roles(bs);
1993 DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname);
1998 bstp_migrate_delay_expiry(struct bstp_state *bs, struct bstp_port *bp)
2000 bp->bp_flags |= BSTP_PORT_CANMIGRATE;
2004 bstp_edge_delay_expiry(struct bstp_state *bs, struct bstp_port *bp)
2006 if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) &&
2007 bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing &&
2008 bp->bp_role == BSTP_ROLE_DESIGNATED) {
2009 bp->bp_operedge = 1;
2010 DPRINTF("%s -> edge port\n", bp->bp_ifp->if_xname);
2015 bstp_addr_cmp(const uint8_t *a, const uint8_t *b)
2019 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2020 d = ((int)a[i]) - ((int)b[i]);
2027 * compare the bridge address component of the bridgeid
2030 bstp_same_bridgeid(uint64_t id1, uint64_t id2)
2032 u_char addr1[ETHER_ADDR_LEN];
2033 u_char addr2[ETHER_ADDR_LEN];
2035 PV2ADDR(id1, addr1);
2036 PV2ADDR(id2, addr2);
2038 if (bstp_addr_cmp(addr1, addr2) == 0)
2045 bstp_reinit(struct bstp_state *bs)
2047 struct epoch_tracker et;
2048 struct bstp_port *bp;
2049 struct ifnet *ifp, *mif;
2052 static const u_char llzero[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
2054 BSTP_LOCK_ASSERT(bs);
2056 if (LIST_EMPTY(&bs->bs_bplist))
2060 bridgeptr = LIST_FIRST(&bs->bs_bplist)->bp_ifp->if_bridge;
2061 KASSERT(bridgeptr != NULL, ("Invalid bridge pointer"));
2063 * Search through the Ethernet adapters and find the one with the
2064 * lowest value. Make sure the adapter which we take the MAC address
2065 * from is part of this bridge, so we can have more than one independent
2066 * bridges in the same STP domain.
2068 NET_EPOCH_ENTER(et);
2069 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2070 if (ifp->if_type != IFT_ETHER && ifp->if_type != IFT_L2VLAN)
2071 continue; /* Not Ethernet */
2073 if (ifp->if_bridge != bridgeptr)
2074 continue; /* Not part of our bridge */
2076 if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0)
2077 continue; /* No mac address set */
2083 if (bstp_addr_cmp(IF_LLADDR(ifp), IF_LLADDR(mif)) < 0) {
2092 e_addr = IF_LLADDR(mif);
2093 bs->bs_bridge_pv.pv_dbridge_id =
2094 (((uint64_t)bs->bs_bridge_priority) << 48) |
2095 (((uint64_t)e_addr[0]) << 40) |
2096 (((uint64_t)e_addr[1]) << 32) |
2097 (((uint64_t)e_addr[2]) << 24) |
2098 (((uint64_t)e_addr[3]) << 16) |
2099 (((uint64_t)e_addr[4]) << 8) |
2100 (((uint64_t)e_addr[5]));
2102 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id;
2103 bs->bs_bridge_pv.pv_cost = 0;
2104 bs->bs_bridge_pv.pv_dport_id = 0;
2105 bs->bs_bridge_pv.pv_port_id = 0;
2107 if (bs->bs_running && callout_pending(&bs->bs_bstpcallout) == 0)
2108 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs);
2110 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
2111 bp->bp_port_id = (bp->bp_priority << 8) |
2112 (bp->bp_ifp->if_index & 0xfff);
2113 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask);
2116 bstp_assign_roles(bs);
2117 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER);
2121 /* Set the bridge and root id (lower bits) to zero */
2122 bs->bs_bridge_pv.pv_dbridge_id =
2123 ((uint64_t)bs->bs_bridge_priority) << 48;
2124 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id;
2125 bs->bs_root_pv = bs->bs_bridge_pv;
2126 /* Disable any remaining ports, they will have no MAC address */
2127 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
2128 bp->bp_infois = BSTP_INFO_DISABLED;
2129 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
2131 callout_stop(&bs->bs_bstpcallout);
2135 bstp_modevent(module_t mod, int type, void *data)
2139 mtx_init(&bstp_list_mtx, "bridgestp list", NULL, MTX_DEF);
2140 LIST_INIT(&bstp_list);
2143 mtx_destroy(&bstp_list_mtx);
2146 return (EOPNOTSUPP);
2151 static moduledata_t bstp_mod = {
2157 DECLARE_MODULE(bridgestp, bstp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
2158 MODULE_VERSION(bridgestp, 1);
2161 bstp_attach(struct bstp_state *bs, struct bstp_cb_ops *cb)
2164 callout_init_mtx(&bs->bs_bstpcallout, &bs->bs_mtx, 0);
2165 LIST_INIT(&bs->bs_bplist);
2167 bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE;
2168 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME;
2169 bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY;
2170 bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY;
2171 bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME;
2172 bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY;
2173 bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT;
2174 bs->bs_protover = BSTP_PROTO_RSTP;
2175 bs->bs_state_cb = cb->bcb_state;
2176 bs->bs_rtage_cb = cb->bcb_rtage;
2177 bs->bs_vnet = curvnet;
2179 getmicrotime(&bs->bs_last_tc_time);
2181 mtx_lock(&bstp_list_mtx);
2182 LIST_INSERT_HEAD(&bstp_list, bs, bs_list);
2183 mtx_unlock(&bstp_list_mtx);
2187 bstp_detach(struct bstp_state *bs)
2189 KASSERT(LIST_EMPTY(&bs->bs_bplist), ("bstp still active"));
2191 mtx_lock(&bstp_list_mtx);
2192 LIST_REMOVE(bs, bs_list);
2193 mtx_unlock(&bstp_list_mtx);
2194 callout_drain(&bs->bs_bstpcallout);
2195 BSTP_LOCK_DESTROY(bs);
2199 bstp_init(struct bstp_state *bs)
2202 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs);
2209 bstp_stop(struct bstp_state *bs)
2211 struct bstp_port *bp;
2215 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
2216 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
2219 callout_stop(&bs->bs_bstpcallout);
2224 bstp_create(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *ifp)
2226 bzero(bp, sizeof(struct bstp_port));
2231 bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY;
2232 TASK_INIT(&bp->bp_statetask, 0, bstp_notify_state, bp);
2233 TASK_INIT(&bp->bp_rtagetask, 0, bstp_notify_rtage, bp);
2234 TASK_INIT(&bp->bp_mediatask, 0, bstp_ifupdstatus, bp);
2237 bp->bp_infois = BSTP_INFO_DISABLED;
2238 bp->bp_flags = BSTP_PORT_AUTOEDGE|BSTP_PORT_AUTOPTP;
2239 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
2240 bstp_set_port_proto(bp, bs->bs_protover);
2241 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
2242 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
2243 bp->bp_path_cost = bstp_calc_path_cost(bp);
2249 bstp_enable(struct bstp_port *bp)
2251 struct bstp_state *bs = bp->bp_bs;
2252 struct ifnet *ifp = bp->bp_ifp;
2254 KASSERT(bp->bp_active == 0, ("already a bstp member"));
2255 NET_EPOCH_ASSERT(); /* Because bstp_update_roles() causes traffic. */
2257 switch (ifp->if_type) {
2258 case IFT_ETHER: /* These can do spanning tree. */
2262 /* Nothing else can. */
2267 LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next);
2269 bp->bp_flags |= BSTP_PORT_NEWINFO;
2271 bstp_update_roles(bs, bp);
2277 bstp_disable(struct bstp_port *bp)
2279 struct bstp_state *bs = bp->bp_bs;
2281 KASSERT(bp->bp_active == 1, ("not a bstp member"));
2284 bstp_disable_port(bs, bp);
2285 LIST_REMOVE(bp, bp_next);
2292 * The bstp_port structure is about to be freed by the parent bridge.
2295 bstp_destroy(struct bstp_port *bp)
2297 KASSERT(bp->bp_active == 0, ("port is still attached"));
2298 taskqueue_drain(taskqueue_swi, &bp->bp_statetask);
2299 taskqueue_drain(taskqueue_swi, &bp->bp_rtagetask);
2300 taskqueue_drain(taskqueue_swi, &bp->bp_mediatask);
2302 if (bp->bp_bs->bs_root_port == bp)
2303 bstp_assign_roles(bp->bp_bs);