59
60#include <netinet/in.h>
61#include <netinet/in_systm.h>
62#include <netinet/in_var.h>
63#include <netinet/if_ether.h>
64#include <net/bridgestp.h>
65
66#ifdef BRIDGESTP_DEBUG
67#define DPRINTF(fmt, arg...) printf("bstp: " fmt, ##arg)
68#else
69#define DPRINTF(fmt, arg...)
70#endif
71
72#define PV2ADDR(pv, eaddr) do { \
73 eaddr[0] = pv >> 40; \
74 eaddr[1] = pv >> 32; \
75 eaddr[2] = pv >> 24; \
76 eaddr[3] = pv >> 16; \
77 eaddr[4] = pv >> 8; \
78 eaddr[5] = pv >> 0; \
79} while (0)
80
81#define INFO_BETTER 1
82#define INFO_SAME 0
83#define INFO_WORSE -1
84
85const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
86
87LIST_HEAD(, bstp_state) bstp_list;
88static struct mtx bstp_list_mtx;
89
90static void bstp_transmit(struct bstp_state *, struct bstp_port *);
91static void bstp_transmit_bpdu(struct bstp_state *, struct bstp_port *);
92static void bstp_transmit_tcn(struct bstp_state *, struct bstp_port *);
93static void bstp_decode_bpdu(struct bstp_port *, struct bstp_cbpdu *,
94 struct bstp_config_unit *);
95static void bstp_send_bpdu(struct bstp_state *, struct bstp_port *,
96 struct bstp_cbpdu *);
97static void bstp_enqueue(struct ifnet *, struct mbuf *);
98static int bstp_pdu_flags(struct bstp_port *);
99static void bstp_received_stp(struct bstp_state *, struct bstp_port *,
100 struct mbuf **, struct bstp_tbpdu *);
101static void bstp_received_rstp(struct bstp_state *, struct bstp_port *,
102 struct mbuf **, struct bstp_tbpdu *);
103static void bstp_received_tcn(struct bstp_state *, struct bstp_port *,
104 struct bstp_tcn_unit *);
105static void bstp_received_bpdu(struct bstp_state *, struct bstp_port *,
106 struct bstp_config_unit *);
107static int bstp_pdu_rcvtype(struct bstp_port *, struct bstp_config_unit *);
108static int bstp_pdu_bettersame(struct bstp_port *, int);
109static int bstp_info_cmp(struct bstp_pri_vector *,
110 struct bstp_pri_vector *);
111static int bstp_info_superior(struct bstp_pri_vector *,
112 struct bstp_pri_vector *);
113static void bstp_assign_roles(struct bstp_state *);
114static void bstp_update_roles(struct bstp_state *, struct bstp_port *);
115static void bstp_update_state(struct bstp_state *, struct bstp_port *);
116static void bstp_update_tc(struct bstp_port *);
117static void bstp_update_info(struct bstp_port *);
118static void bstp_set_other_tcprop(struct bstp_port *);
119static void bstp_set_all_reroot(struct bstp_state *);
120static void bstp_set_all_sync(struct bstp_state *);
121static void bstp_set_port_state(struct bstp_port *, int);
122static void bstp_set_port_role(struct bstp_port *, int);
123static void bstp_set_port_proto(struct bstp_port *, int);
124static void bstp_set_port_tc(struct bstp_port *, int);
125static void bstp_set_timer_tc(struct bstp_port *);
126static void bstp_set_timer_msgage(struct bstp_port *);
127static int bstp_rerooted(struct bstp_state *, struct bstp_port *);
128static uint32_t bstp_calc_path_cost(struct bstp_port *);
129static void bstp_notify_state(void *, int);
130static void bstp_notify_rtage(void *, int);
131static void bstp_ifupdstatus(struct bstp_state *, struct bstp_port *);
132static void bstp_enable_port(struct bstp_state *, struct bstp_port *);
133static void bstp_disable_port(struct bstp_state *, struct bstp_port *);
134static void bstp_tick(void *);
135static void bstp_timer_start(struct bstp_timer *, uint16_t);
136static void bstp_timer_stop(struct bstp_timer *);
137static void bstp_timer_latch(struct bstp_timer *);
138static int bstp_timer_expired(struct bstp_timer *);
139static void bstp_hello_timer_expiry(struct bstp_state *,
140 struct bstp_port *);
141static void bstp_message_age_expiry(struct bstp_state *,
142 struct bstp_port *);
143static void bstp_migrate_delay_expiry(struct bstp_state *,
144 struct bstp_port *);
145static void bstp_edge_delay_expiry(struct bstp_state *,
146 struct bstp_port *);
147static int bstp_addr_cmp(const uint8_t *, const uint8_t *);
148static int bstp_same_bridgeid(uint64_t, uint64_t);
149static void bstp_reinit(struct bstp_state *);
150
151static void
152bstp_transmit(struct bstp_state *bs, struct bstp_port *bp)
153{
154 if (bs->bs_running == 0)
155 return;
156
157 /*
158 * a PDU can only be sent if we have tx quota left and the
159 * hello timer is running.
160 */
161 if (bp->bp_hello_timer.active == 0) {
162 /* Test if it needs to be reset */
163 bstp_hello_timer_expiry(bs, bp);
164 return;
165 }
166 if (bp->bp_txcount > bs->bs_txholdcount)
167 /* Ran out of karma */
168 return;
169
170 if (bp->bp_protover == BSTP_PROTO_RSTP) {
171 bstp_transmit_bpdu(bs, bp);
172 bp->bp_tc_ack = 0;
173 } else { /* STP */
174 switch (bp->bp_role) {
175 case BSTP_ROLE_DESIGNATED:
176 bstp_transmit_bpdu(bs, bp);
177 bp->bp_tc_ack = 0;
178 break;
179
180 case BSTP_ROLE_ROOT:
181 bstp_transmit_tcn(bs, bp);
182 break;
183 }
184 }
185 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime);
186 bp->bp_flags &= ~BSTP_PORT_NEWINFO;
187}
188
189static void
190bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp)
191{
192 struct bstp_cbpdu bpdu;
193
194 BSTP_LOCK_ASSERT(bs);
195
196 bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48);
197 PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr);
198
199 bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost);
200
201 bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48);
202 PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr);
203
204 bpdu.cbu_portid = htons(bp->bp_port_id);
205 bpdu.cbu_messageage = htons(bp->bp_desg_msg_age);
206 bpdu.cbu_maxage = htons(bp->bp_desg_max_age);
207 bpdu.cbu_hellotime = htons(bp->bp_desg_htime);
208 bpdu.cbu_forwarddelay = htons(bp->bp_desg_fdelay);
209
210 bpdu.cbu_flags = bstp_pdu_flags(bp);
211
212 switch (bp->bp_protover) {
213 case BSTP_PROTO_STP:
214 bpdu.cbu_bpdutype = BSTP_MSGTYPE_CFG;
215 break;
216
217 case BSTP_PROTO_RSTP:
218 bpdu.cbu_bpdutype = BSTP_MSGTYPE_RSTP;
219 break;
220 }
221
222 bstp_send_bpdu(bs, bp, &bpdu);
223}
224
225static void
226bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp)
227{
228 struct bstp_tbpdu bpdu;
229 struct ifnet *ifp = bp->bp_ifp;
230 struct ether_header *eh;
231 struct mbuf *m;
232
233 KASSERT(bp == bs->bs_root_port, ("%s: bad root port\n", __func__));
234
235 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
236 return;
237
238 MGETHDR(m, M_DONTWAIT, MT_DATA);
239 if (m == NULL)
240 return;
241
242 m->m_pkthdr.rcvif = ifp;
243 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu);
244 m->m_len = m->m_pkthdr.len;
245
246 eh = mtod(m, struct ether_header *);
247
248 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
249 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
250 eh->ether_type = htons(sizeof(bpdu));
251
252 bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP;
253 bpdu.tbu_ctl = LLC_UI;
254 bpdu.tbu_protoid = 0;
255 bpdu.tbu_protover = 0;
256 bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN;
257
258 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu));
259
260 bp->bp_txcount++;
261 bstp_enqueue(ifp, m);
262}
263
264static void
265bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu,
266 struct bstp_config_unit *cu)
267{
268 int flags;
269
270 cu->cu_pv.pv_root_id =
271 (((uint64_t)ntohs(cpdu->cbu_rootpri)) << 48) |
272 (((uint64_t)cpdu->cbu_rootaddr[0]) << 40) |
273 (((uint64_t)cpdu->cbu_rootaddr[1]) << 32) |
274 (((uint64_t)cpdu->cbu_rootaddr[2]) << 24) |
275 (((uint64_t)cpdu->cbu_rootaddr[3]) << 16) |
276 (((uint64_t)cpdu->cbu_rootaddr[4]) << 8) |
277 (((uint64_t)cpdu->cbu_rootaddr[5]) << 0);
278
279 cu->cu_pv.pv_dbridge_id =
280 (((uint64_t)ntohs(cpdu->cbu_bridgepri)) << 48) |
281 (((uint64_t)cpdu->cbu_bridgeaddr[0]) << 40) |
282 (((uint64_t)cpdu->cbu_bridgeaddr[1]) << 32) |
283 (((uint64_t)cpdu->cbu_bridgeaddr[2]) << 24) |
284 (((uint64_t)cpdu->cbu_bridgeaddr[3]) << 16) |
285 (((uint64_t)cpdu->cbu_bridgeaddr[4]) << 8) |
286 (((uint64_t)cpdu->cbu_bridgeaddr[5]) << 0);
287
288 cu->cu_pv.pv_cost = ntohl(cpdu->cbu_rootpathcost);
289 cu->cu_message_age = ntohs(cpdu->cbu_messageage);
290 cu->cu_max_age = ntohs(cpdu->cbu_maxage);
291 cu->cu_hello_time = ntohs(cpdu->cbu_hellotime);
292 cu->cu_forward_delay = ntohs(cpdu->cbu_forwarddelay);
293 cu->cu_pv.pv_dport_id = ntohs(cpdu->cbu_portid);
294 cu->cu_pv.pv_port_id = bp->bp_port_id;
295 cu->cu_message_type = cpdu->cbu_bpdutype;
296
297 /* Strip off unused flags in STP mode */
298 flags = cpdu->cbu_flags;
299 switch (cpdu->cbu_protover) {
300 case BSTP_PROTO_STP:
301 flags &= BSTP_PDU_STPMASK;
302 /* A STP BPDU explicitly conveys a Designated Port */
303 cu->cu_role = BSTP_ROLE_DESIGNATED;
304 break;
305
306 case BSTP_PROTO_RSTP:
307 flags &= BSTP_PDU_RSTPMASK;
308 break;
309 }
310
311 cu->cu_topology_change_ack =
312 (flags & BSTP_PDU_F_TCA) ? 1 : 0;
313 cu->cu_proposal =
314 (flags & BSTP_PDU_F_P) ? 1 : 0;
315 cu->cu_agree =
316 (flags & BSTP_PDU_F_A) ? 1 : 0;
317 cu->cu_learning =
318 (flags & BSTP_PDU_F_L) ? 1 : 0;
319 cu->cu_forwarding =
320 (flags & BSTP_PDU_F_F) ? 1 : 0;
321 cu->cu_topology_change =
322 (flags & BSTP_PDU_F_TC) ? 1 : 0;
323
324 switch ((flags & BSTP_PDU_PRMASK) >> BSTP_PDU_PRSHIFT) {
325 case BSTP_PDU_F_ROOT:
326 cu->cu_role = BSTP_ROLE_ROOT;
327 break;
328 case BSTP_PDU_F_ALT:
329 cu->cu_role = BSTP_ROLE_ALTERNATE;
330 break;
331 case BSTP_PDU_F_DESG:
332 cu->cu_role = BSTP_ROLE_DESIGNATED;
333 break;
334 }
335}
336
337static void
338bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp,
339 struct bstp_cbpdu *bpdu)
340{
341 struct ifnet *ifp;
342 struct mbuf *m;
343 struct ether_header *eh;
344
345 BSTP_LOCK_ASSERT(bs);
346
347 ifp = bp->bp_ifp;
348
349 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
350 return;
351
352 MGETHDR(m, M_DONTWAIT, MT_DATA);
353 if (m == NULL)
354 return;
355
356 eh = mtod(m, struct ether_header *);
357
358 bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP;
359 bpdu->cbu_ctl = LLC_UI;
360 bpdu->cbu_protoid = htons(BSTP_PROTO_ID);
361
362 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
363 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
364
365 switch (bpdu->cbu_bpdutype) {
366 case BSTP_MSGTYPE_CFG:
367 bpdu->cbu_protover = BSTP_PROTO_STP;
368 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_STP_LEN;
369 eh->ether_type = htons(BSTP_BPDU_STP_LEN);
370 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu,
371 BSTP_BPDU_STP_LEN);
372 break;
373
374 case BSTP_MSGTYPE_RSTP:
375 bpdu->cbu_protover = BSTP_PROTO_RSTP;
376 bpdu->cbu_versionlen = htons(0);
377 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_RSTP_LEN;
378 eh->ether_type = htons(BSTP_BPDU_RSTP_LEN);
379 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu,
380 BSTP_BPDU_RSTP_LEN);
381 break;
382
383 default:
384 panic("not implemented");
385 }
386 m->m_pkthdr.rcvif = ifp;
387 m->m_len = m->m_pkthdr.len;
388
389 bp->bp_txcount++;
390 bstp_enqueue(ifp, m);
391}
392
393static void
394bstp_enqueue(struct ifnet *dst_ifp, struct mbuf *m)
395{
396 int err = 0;
397
398 IFQ_ENQUEUE(&dst_ifp->if_snd, m, err);
399
400 if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0)
401 (*dst_ifp->if_start)(dst_ifp);
402}
403
404static int
405bstp_pdu_flags(struct bstp_port *bp)
406{
407 int flags = 0;
408
409 if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING)
410 flags |= BSTP_PDU_F_P;
411
412 if (bp->bp_agree)
413 flags |= BSTP_PDU_F_A;
414
415 if (bp->bp_tc_timer.active)
416 flags |= BSTP_PDU_F_TC;
417
418 if (bp->bp_tc_ack)
419 flags |= BSTP_PDU_F_TCA;
420
421 switch (bp->bp_state) {
422 case BSTP_IFSTATE_LEARNING:
423 flags |= BSTP_PDU_F_L;
424 break;
425
426 case BSTP_IFSTATE_FORWARDING:
427 flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F);
428 break;
429 }
430
431 switch (bp->bp_role) {
432 case BSTP_ROLE_ROOT:
433 flags |=
434 (BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT);
435 break;
436
437 case BSTP_ROLE_ALTERNATE:
438 case BSTP_ROLE_BACKUP: /* fall through */
439 flags |=
440 (BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT);
441 break;
442
443 case BSTP_ROLE_DESIGNATED:
444 flags |=
445 (BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT);
446 break;
447 }
448
449 /* Strip off unused flags in either mode */
450 switch (bp->bp_protover) {
451 case BSTP_PROTO_STP:
452 flags &= BSTP_PDU_STPMASK;
453 break;
454 case BSTP_PROTO_RSTP:
455 flags &= BSTP_PDU_RSTPMASK;
456 break;
457 }
458 return (flags);
459}
460
461struct mbuf *
462bstp_input(struct bstp_port *bp, struct ifnet *ifp, struct mbuf *m)
463{
464 struct bstp_state *bs = bp->bp_bs;
465 struct ether_header *eh;
466 struct bstp_tbpdu tpdu;
467 uint16_t len;
468
469 if (bp->bp_active == 0) {
470 m_freem(m);
471 return (NULL);
472 }
473
474 BSTP_LOCK(bs);
475
476 eh = mtod(m, struct ether_header *);
477
478 len = ntohs(eh->ether_type);
479 if (len < sizeof(tpdu))
480 goto out;
481
482 m_adj(m, ETHER_HDR_LEN);
483
484 if (m->m_pkthdr.len > len)
485 m_adj(m, len - m->m_pkthdr.len);
486 if (m->m_len < sizeof(tpdu) &&
487 (m = m_pullup(m, sizeof(tpdu))) == NULL)
488 goto out;
489
490 memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu));
491
492 /* basic packet checks */
493 if (tpdu.tbu_dsap != LLC_8021D_LSAP ||
494 tpdu.tbu_ssap != LLC_8021D_LSAP ||
495 tpdu.tbu_ctl != LLC_UI)
496 goto out;
497 if (tpdu.tbu_protoid != BSTP_PROTO_ID)
498 goto out;
499
500 /*
501 * We can treat later versions of the PDU as the same as the maximum
502 * version we implement. All additional parameters/flags are ignored.
503 */
504 if (tpdu.tbu_protover > BSTP_PROTO_MAX)
505 tpdu.tbu_protover = BSTP_PROTO_MAX;
506
507 if (tpdu.tbu_protover != bp->bp_protover) {
508 /*
509 * Wait for the migration delay timer to expire before changing
510 * protocol version to avoid flip-flops.
511 */
512 if (bp->bp_flags & BSTP_PORT_CANMIGRATE)
513 bstp_set_port_proto(bp, tpdu.tbu_protover);
514 else
515 goto out;
516 }
517
518 /* Clear operedge upon receiving a PDU on the port */
519 bp->bp_operedge = 0;
520 bstp_timer_start(&bp->bp_edge_delay_timer,
521 BSTP_DEFAULT_MIGRATE_DELAY);
522
523 switch (tpdu.tbu_protover) {
524 case BSTP_PROTO_STP:
525 bstp_received_stp(bs, bp, &m, &tpdu);
526 break;
527
528 case BSTP_PROTO_RSTP:
529 bstp_received_rstp(bs, bp, &m, &tpdu);
530 break;
531 }
532out:
533 BSTP_UNLOCK(bs);
534 if (m)
535 m_freem(m);
536 return (NULL);
537}
538
539static void
540bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp,
541 struct mbuf **mp, struct bstp_tbpdu *tpdu)
542{
543 struct bstp_cbpdu cpdu;
544 struct bstp_config_unit *cu = &bp->bp_msg_cu;
545 struct bstp_tcn_unit tu;
546
547 switch (tpdu->tbu_bpdutype) {
548 case BSTP_MSGTYPE_TCN:
549 tu.tu_message_type = tpdu->tbu_bpdutype;
550 bstp_received_tcn(bs, bp, &tu);
551 break;
552 case BSTP_MSGTYPE_CFG:
553 if ((*mp)->m_len < BSTP_BPDU_STP_LEN &&
554 (*mp = m_pullup(*mp, BSTP_BPDU_STP_LEN)) == NULL)
555 return;
556 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_STP_LEN);
557
558 bstp_decode_bpdu(bp, &cpdu, cu);
559 bstp_received_bpdu(bs, bp, cu);
560 break;
561 }
562}
563
564static void
565bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp,
566 struct mbuf **mp, struct bstp_tbpdu *tpdu)
567{
568 struct bstp_cbpdu cpdu;
569 struct bstp_config_unit *cu = &bp->bp_msg_cu;
570
571 if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP)
572 return;
573
574 if ((*mp)->m_len < BSTP_BPDU_RSTP_LEN &&
575 (*mp = m_pullup(*mp, BSTP_BPDU_RSTP_LEN)) == NULL)
576 return;
577 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_RSTP_LEN);
578
579 bstp_decode_bpdu(bp, &cpdu, cu);
580 bstp_received_bpdu(bs, bp, cu);
581}
582
583static void
584bstp_received_tcn(struct bstp_state *bs, struct bstp_port *bp,
585 struct bstp_tcn_unit *tcn)
586{
587 bp->bp_rcvdtcn = 1;
588 bstp_update_tc(bp);
589}
590
591static void
592bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp,
593 struct bstp_config_unit *cu)
594{
595 int type;
596
597 BSTP_LOCK_ASSERT(bs);
598
599 /* We need to have transitioned to INFO_MINE before proceeding */
600 switch (bp->bp_infois) {
601 case BSTP_INFO_DISABLED:
602 case BSTP_INFO_AGED:
603 return;
604 }
605
606 type = bstp_pdu_rcvtype(bp, cu);
607
608 switch (type) {
609 case BSTP_PDU_SUPERIOR:
610 bs->bs_allsynced = 0;
611 bp->bp_agreed = 0;
612 bp->bp_proposing = 0;
613
614 if (cu->cu_proposal && cu->cu_forwarding == 0)
615 bp->bp_proposed = 1;
616 if (cu->cu_topology_change)
617 bp->bp_rcvdtc = 1;
618 if (cu->cu_topology_change_ack)
619 bp->bp_rcvdtca = 1;
620
621 if (bp->bp_agree &&
622 !bstp_pdu_bettersame(bp, BSTP_INFO_RECEIVED))
623 bp->bp_agree = 0;
624
625 /* copy the received priority and timers to the port */
626 bp->bp_port_pv = cu->cu_pv;
627 bp->bp_port_msg_age = cu->cu_message_age;
628 bp->bp_port_max_age = cu->cu_max_age;
629 bp->bp_port_fdelay = cu->cu_forward_delay;
630 bp->bp_port_htime =
631 (cu->cu_hello_time > BSTP_MIN_HELLO_TIME ?
632 cu->cu_hello_time : BSTP_MIN_HELLO_TIME);
633
634 /* set expiry for the new info */
635 bstp_set_timer_msgage(bp);
636
637 bp->bp_infois = BSTP_INFO_RECEIVED;
638 bstp_assign_roles(bs);
639 break;
640
641 case BSTP_PDU_REPEATED:
642 if (cu->cu_proposal && cu->cu_forwarding == 0)
643 bp->bp_proposed = 1;
644 if (cu->cu_topology_change)
645 bp->bp_rcvdtc = 1;
646 if (cu->cu_topology_change_ack)
647 bp->bp_rcvdtca = 1;
648
649 /* rearm the age timer */
650 bstp_set_timer_msgage(bp);
651 break;
652
653 case BSTP_PDU_INFERIOR:
654 if (cu->cu_learning) {
655 bp->bp_agreed = 1;
656 bp->bp_proposing = 0;
657 }
658 break;
659
660 case BSTP_PDU_INFERIORALT:
661 /*
662 * only point to point links are allowed fast
663 * transitions to forwarding.
664 */
665 if (cu->cu_agree && bp->bp_ptp_link) {
666 bp->bp_agreed = 1;
667 bp->bp_proposing = 0;
668 } else
669 bp->bp_agreed = 0;
670
671 if (cu->cu_topology_change)
672 bp->bp_rcvdtc = 1;
673 if (cu->cu_topology_change_ack)
674 bp->bp_rcvdtca = 1;
675 break;
676
677 case BSTP_PDU_OTHER:
678 return; /* do nothing */
679 }
680 /* update the state machines with the new data */
681 bstp_update_state(bs, bp);
682}
683
684static int
685bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu)
686{
687 int type;
688
689 /* default return type */
690 type = BSTP_PDU_OTHER;
691
692 switch (cu->cu_role) {
693 case BSTP_ROLE_DESIGNATED:
694 if (bstp_info_superior(&bp->bp_port_pv, &cu->cu_pv))
695 /* bpdu priority is superior */
696 type = BSTP_PDU_SUPERIOR;
697 else if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) ==
698 INFO_SAME) {
699 if (bp->bp_port_msg_age != cu->cu_message_age ||
700 bp->bp_port_max_age != cu->cu_max_age ||
701 bp->bp_port_fdelay != cu->cu_forward_delay ||
702 bp->bp_port_htime != cu->cu_hello_time)
703 /* bpdu priority is equal and timers differ */
704 type = BSTP_PDU_SUPERIOR;
705 else
706 /* bpdu is equal */
707 type = BSTP_PDU_REPEATED;
708 } else
709 /* bpdu priority is worse */
710 type = BSTP_PDU_INFERIOR;
711
712 break;
713
714 case BSTP_ROLE_ROOT:
715 case BSTP_ROLE_ALTERNATE:
716 case BSTP_ROLE_BACKUP:
717 if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) <= INFO_SAME)
718 /*
719 * not a designated port and priority is the same or
720 * worse
721 */
722 type = BSTP_PDU_INFERIORALT;
723 break;
724 }
725
726 return (type);
727}
728
729static int
730bstp_pdu_bettersame(struct bstp_port *bp, int newinfo)
731{
732 if (newinfo == BSTP_INFO_RECEIVED &&
733 bp->bp_infois == BSTP_INFO_RECEIVED &&
734 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME)
735 return (1);
736
737 if (newinfo == BSTP_INFO_MINE &&
738 bp->bp_infois == BSTP_INFO_MINE &&
739 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) >= INFO_SAME)
740 return (1);
741
742 return (0);
743}
744
745static int
746bstp_info_cmp(struct bstp_pri_vector *pv,
747 struct bstp_pri_vector *cpv)
748{
749 if (cpv->pv_root_id < pv->pv_root_id)
750 return (INFO_BETTER);
751 if (cpv->pv_root_id > pv->pv_root_id)
752 return (INFO_WORSE);
753
754 if (cpv->pv_cost < pv->pv_cost)
755 return (INFO_BETTER);
756 if (cpv->pv_cost > pv->pv_cost)
757 return (INFO_WORSE);
758
759 if (cpv->pv_dbridge_id < pv->pv_dbridge_id)
760 return (INFO_BETTER);
761 if (cpv->pv_dbridge_id > pv->pv_dbridge_id)
762 return (INFO_WORSE);
763
764 if (cpv->pv_dport_id < pv->pv_dport_id)
765 return (INFO_BETTER);
766 if (cpv->pv_dport_id > pv->pv_dport_id)
767 return (INFO_WORSE);
768
769 return (INFO_SAME);
770}
771
772/*
773 * This message priority vector is superior to the port priority vector and
774 * will replace it if, and only if, the message priority vector is better than
775 * the port priority vector, or the message has been transmitted from the same
776 * designated bridge and designated port as the port priority vector.
777 */
778static int
779bstp_info_superior(struct bstp_pri_vector *pv,
780 struct bstp_pri_vector *cpv)
781{
782 if (bstp_info_cmp(pv, cpv) == INFO_BETTER ||
783 (bstp_same_bridgeid(pv->pv_dbridge_id, cpv->pv_dbridge_id) &&
784 (cpv->pv_dport_id & 0xfff) == (pv->pv_dport_id & 0xfff)))
785 return (1);
786 return (0);
787}
788
789static void
790bstp_assign_roles(struct bstp_state *bs)
791{
792 struct bstp_port *bp, *rbp = NULL;
793 struct bstp_pri_vector pv;
794
795 /* default to our priority vector */
796 bs->bs_root_pv = bs->bs_bridge_pv;
797 bs->bs_root_msg_age = 0;
798 bs->bs_root_max_age = bs->bs_bridge_max_age;
799 bs->bs_root_fdelay = bs->bs_bridge_fdelay;
800 bs->bs_root_htime = bs->bs_bridge_htime;
801 bs->bs_root_port = NULL;
802
803 /* check if any recieved info supersedes us */
804 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
805 if (bp->bp_infois != BSTP_INFO_RECEIVED)
806 continue;
807
808 pv = bp->bp_port_pv;
809 pv.pv_cost += bp->bp_path_cost;
810
811 /*
812 * The root priority vector is the best of the set comprising
813 * the bridge priority vector plus all root path priority
814 * vectors whose bridge address is not equal to us.
815 */
816 if (bstp_same_bridgeid(pv.pv_dbridge_id,
817 bs->bs_bridge_pv.pv_dbridge_id) == 0 &&
818 bstp_info_cmp(&bs->bs_root_pv, &pv) == INFO_BETTER) {
819 /* the port vector replaces the root */
820 bs->bs_root_pv = pv;
821 bs->bs_root_msg_age = bp->bp_port_msg_age +
822 BSTP_MESSAGE_AGE_INCR;
823 bs->bs_root_max_age = bp->bp_port_max_age;
824 bs->bs_root_fdelay = bp->bp_port_fdelay;
825 bs->bs_root_htime = bp->bp_port_htime;
826 rbp = bp;
827 }
828 }
829
830 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
831 /* calculate the port designated vector */
832 bp->bp_desg_pv.pv_root_id = bs->bs_root_pv.pv_root_id;
833 bp->bp_desg_pv.pv_cost = bs->bs_root_pv.pv_cost;
834 bp->bp_desg_pv.pv_dbridge_id = bs->bs_bridge_pv.pv_dbridge_id;
835 bp->bp_desg_pv.pv_dport_id = bp->bp_port_id;
836 bp->bp_desg_pv.pv_port_id = bp->bp_port_id;
837
838 /* calculate designated times */
839 bp->bp_desg_msg_age = bs->bs_root_msg_age;
840 bp->bp_desg_max_age = bs->bs_root_max_age;
841 bp->bp_desg_fdelay = bs->bs_root_fdelay;
842 bp->bp_desg_htime = bs->bs_bridge_htime;
843
844
845 switch (bp->bp_infois) {
846 case BSTP_INFO_DISABLED:
847 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
848 break;
849
850 case BSTP_INFO_AGED:
851 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
852 bstp_update_info(bp);
853 break;
854
855 case BSTP_INFO_MINE:
856 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
857 /* update the port info if stale */
858 if (bstp_info_cmp(&bp->bp_port_pv,
859 &bp->bp_desg_pv) != INFO_SAME ||
860 (rbp != NULL &&
861 (bp->bp_port_msg_age != rbp->bp_port_msg_age ||
862 bp->bp_port_max_age != rbp->bp_port_max_age ||
863 bp->bp_port_fdelay != rbp->bp_port_fdelay ||
864 bp->bp_port_htime != rbp->bp_port_htime)))
865 bstp_update_info(bp);
866 break;
867
868 case BSTP_INFO_RECEIVED:
869 if (bp == rbp) {
870 /*
871 * root priority is derived from this
872 * port, make it the root port.
873 */
874 bstp_set_port_role(bp, BSTP_ROLE_ROOT);
875 bs->bs_root_port = bp;
876 } else if (bstp_info_cmp(&bp->bp_port_pv,
877 &bp->bp_desg_pv) == INFO_BETTER) {
878 /*
879 * the port priority is lower than the root
880 * port.
881 */
882 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
883 bstp_update_info(bp);
884 } else {
885 if (bstp_same_bridgeid(
886 bp->bp_port_pv.pv_dbridge_id,
887 bs->bs_bridge_pv.pv_dbridge_id)) {
888 /*
889 * the designated bridge refers to
890 * another port on this bridge.
891 */
892 bstp_set_port_role(bp,
893 BSTP_ROLE_BACKUP);
894 } else {
895 /*
896 * the port is an inferior path to the
897 * root bridge.
898 */
899 bstp_set_port_role(bp,
900 BSTP_ROLE_ALTERNATE);
901 }
902 }
903 break;
904 }
905 }
906}
907
908static void
909bstp_update_state(struct bstp_state *bs, struct bstp_port *bp)
910{
911 struct bstp_port *bp2;
912 int synced;
913
914 BSTP_LOCK_ASSERT(bs);
915
916 /* check if all the ports have syncronised again */
917 if (!bs->bs_allsynced) {
918 synced = 1;
919 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
920 if (!(bp2->bp_synced ||
921 bp2->bp_role == BSTP_ROLE_ROOT)) {
922 synced = 0;
923 break;
924 }
925 }
926 bs->bs_allsynced = synced;
927 }
928
929 bstp_update_roles(bs, bp);
930 bstp_update_tc(bp);
931}
932
933static void
934bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp)
935{
936 switch (bp->bp_role) {
937 case BSTP_ROLE_DISABLED:
938 /* Clear any flags if set */
939 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) {
940 bp->bp_sync = 0;
941 bp->bp_synced = 1;
942 bp->bp_reroot = 0;
943 }
944 break;
945
946 case BSTP_ROLE_ALTERNATE:
947 case BSTP_ROLE_BACKUP:
948 if ((bs->bs_allsynced && !bp->bp_agree) ||
949 (bp->bp_proposed && bp->bp_agree)) {
950 bp->bp_proposed = 0;
951 bp->bp_agree = 1;
952 bp->bp_flags |= BSTP_PORT_NEWINFO;
953 DPRINTF("%s -> ALTERNATE_AGREED\n",
954 bp->bp_ifp->if_xname);
955 }
956
957 if (bp->bp_proposed && !bp->bp_agree) {
958 bstp_set_all_sync(bs);
959 bp->bp_proposed = 0;
960 DPRINTF("%s -> ALTERNATE_PROPOSED\n",
961 bp->bp_ifp->if_xname);
962 }
963
964 /* Clear any flags if set */
965 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) {
966 bp->bp_sync = 0;
967 bp->bp_synced = 1;
968 bp->bp_reroot = 0;
969 DPRINTF("%s -> ALTERNATE_PORT\n", bp->bp_ifp->if_xname);
970 }
971 break;
972
973 case BSTP_ROLE_ROOT:
974 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) {
975 bstp_set_all_reroot(bs);
976 DPRINTF("%s -> ROOT_REROOT\n", bp->bp_ifp->if_xname);
977 }
978
979 if ((bs->bs_allsynced && !bp->bp_agree) ||
980 (bp->bp_proposed && bp->bp_agree)) {
981 bp->bp_proposed = 0;
982 bp->bp_sync = 0;
983 bp->bp_agree = 1;
984 bp->bp_flags |= BSTP_PORT_NEWINFO;
985 DPRINTF("%s -> ROOT_AGREED\n", bp->bp_ifp->if_xname);
986 }
987
988 if (bp->bp_proposed && !bp->bp_agree) {
989 bstp_set_all_sync(bs);
990 bp->bp_proposed = 0;
991 DPRINTF("%s -> ROOT_PROPOSED\n", bp->bp_ifp->if_xname);
992 }
993
994 if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
995 (bp->bp_forward_delay_timer.active == 0 ||
996 (bstp_rerooted(bs, bp) &&
997 bp->bp_recent_backup_timer.active == 0 &&
998 bp->bp_protover == BSTP_PROTO_RSTP))) {
999 switch (bp->bp_state) {
1000 case BSTP_IFSTATE_DISCARDING:
1001 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING);
1002 break;
1003 case BSTP_IFSTATE_LEARNING:
1004 bstp_set_port_state(bp,
1005 BSTP_IFSTATE_FORWARDING);
1006 break;
1007 }
1008 }
1009
1010 if (bp->bp_state == BSTP_IFSTATE_FORWARDING && bp->bp_reroot) {
1011 bp->bp_reroot = 0;
1012 DPRINTF("%s -> ROOT_REROOTED\n", bp->bp_ifp->if_xname);
1013 }
1014 break;
1015
1016 case BSTP_ROLE_DESIGNATED:
1017 if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) {
1018 bp->bp_reroot = 0;
1019 DPRINTF("%s -> DESIGNATED_RETIRED\n",
1020 bp->bp_ifp->if_xname);
1021 }
1022
1023 if ((bp->bp_state == BSTP_IFSTATE_DISCARDING &&
1024 !bp->bp_synced) || (bp->bp_agreed && !bp->bp_synced) ||
1025 (bp->bp_operedge && !bp->bp_synced) ||
1026 (bp->bp_sync && bp->bp_synced)) {
1027 bstp_timer_stop(&bp->bp_recent_root_timer);
1028 bp->bp_synced = 1;
1029 bp->bp_sync = 0;
1030 DPRINTF("%s -> DESIGNATED_SYNCED\n",
1031 bp->bp_ifp->if_xname);
1032 }
1033
1034 if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
1035 !bp->bp_agreed && !bp->bp_proposing &&
1036 !bp->bp_operedge) {
1037 bp->bp_proposing = 1;
1038 bp->bp_flags |= BSTP_PORT_NEWINFO;
1039 bstp_timer_start(&bp->bp_edge_delay_timer,
1040 (bp->bp_ptp_link ? BSTP_DEFAULT_MIGRATE_DELAY :
1041 bp->bp_desg_max_age));
1042 DPRINTF("%s -> DESIGNATED_PROPOSE\n",
1043 bp->bp_ifp->if_xname);
1044 }
1045
1046 if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
1047 (bp->bp_forward_delay_timer.active == 0 || bp->bp_agreed ||
1048 bp->bp_operedge) &&
1049 (bp->bp_recent_root_timer.active == 0 || !bp->bp_reroot) &&
1050 !bp->bp_sync) {
1051 if (bp->bp_agreed)
1052 DPRINTF("%s -> AGREED\n", bp->bp_ifp->if_xname);
1053 /*
1054 * If agreed|operedge then go straight to forwarding,
1055 * otherwise follow discard -> learn -> forward.
1056 */
1057 if (bp->bp_agreed || bp->bp_operedge ||
1058 bp->bp_state == BSTP_IFSTATE_LEARNING) {
1059 bstp_set_port_state(bp,
1060 BSTP_IFSTATE_FORWARDING);
1061 bp->bp_agreed = bp->bp_protover;
1062 } else if (bp->bp_state == BSTP_IFSTATE_DISCARDING)
1063 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING);
1064 }
1065
1066 if (((bp->bp_sync && !bp->bp_synced) ||
1067 (bp->bp_reroot && bp->bp_recent_root_timer.active) ||
1068 (bp->bp_flags & BSTP_PORT_DISPUTED)) && !bp->bp_operedge &&
1069 bp->bp_state != BSTP_IFSTATE_DISCARDING) {
1070 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
1071 bp->bp_flags &= ~BSTP_PORT_DISPUTED;
1072 bstp_timer_start(&bp->bp_forward_delay_timer,
1073 bp->bp_protover == BSTP_PROTO_RSTP ?
1074 bp->bp_desg_htime : bp->bp_desg_fdelay);
1075 DPRINTF("%s -> DESIGNATED_DISCARD\n",
1076 bp->bp_ifp->if_xname);
1077 }
1078 break;
1079 }
1080
1081 if (bp->bp_flags & BSTP_PORT_NEWINFO)
1082 bstp_transmit(bs, bp);
1083}
1084
1085static void
1086bstp_update_tc(struct bstp_port *bp)
1087{
1088 switch (bp->bp_tcstate) {
1089 case BSTP_TCSTATE_ACTIVE:
1090 if ((bp->bp_role != BSTP_ROLE_DESIGNATED &&
1091 bp->bp_role != BSTP_ROLE_ROOT) || bp->bp_operedge)
1092 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
1093
1094 if (bp->bp_rcvdtcn)
1095 bstp_set_port_tc(bp, BSTP_TCSTATE_TCN);
1096 if (bp->bp_rcvdtc)
1097 bstp_set_port_tc(bp, BSTP_TCSTATE_TC);
1098
1099 if (bp->bp_tc_prop && !bp->bp_operedge)
1100 bstp_set_port_tc(bp, BSTP_TCSTATE_PROPAG);
1101
1102 if (bp->bp_rcvdtca)
1103 bstp_set_port_tc(bp, BSTP_TCSTATE_ACK);
1104 break;
1105
1106 case BSTP_TCSTATE_INACTIVE:
1107 if ((bp->bp_state == BSTP_IFSTATE_LEARNING ||
1108 bp->bp_state == BSTP_IFSTATE_FORWARDING) &&
1109 bp->bp_fdbflush == 0)
1110 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
1111 break;
1112
1113 case BSTP_TCSTATE_LEARNING:
1114 if (bp->bp_rcvdtc || bp->bp_rcvdtcn || bp->bp_rcvdtca ||
1115 bp->bp_tc_prop)
1116 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
1117 else if (bp->bp_role != BSTP_ROLE_DESIGNATED &&
1118 bp->bp_role != BSTP_ROLE_ROOT &&
1119 bp->bp_state == BSTP_IFSTATE_DISCARDING)
1120 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
1121
1122 if ((bp->bp_role == BSTP_ROLE_DESIGNATED ||
1123 bp->bp_role == BSTP_ROLE_ROOT) &&
1124 bp->bp_state == BSTP_IFSTATE_FORWARDING &&
1125 !bp->bp_operedge)
1126 bstp_set_port_tc(bp, BSTP_TCSTATE_DETECTED);
1127 break;
1128
1129 /* these are transient states and go straight back to ACTIVE */
1130 case BSTP_TCSTATE_DETECTED:
1131 case BSTP_TCSTATE_TCN:
1132 case BSTP_TCSTATE_TC:
1133 case BSTP_TCSTATE_PROPAG:
1134 case BSTP_TCSTATE_ACK:
1135 DPRINTF("Invalid TC state for %s\n",
1136 bp->bp_ifp->if_xname);
1137 break;
1138 }
1139
1140}
1141
1142static void
1143bstp_update_info(struct bstp_port *bp)
1144{
1145 struct bstp_state *bs = bp->bp_bs;
1146
1147 bp->bp_proposing = 0;
1148 bp->bp_proposed = 0;
1149
1150 if (bp->bp_agreed && !bstp_pdu_bettersame(bp, BSTP_INFO_MINE))
1151 bp->bp_agreed = 0;
1152
1153 if (bp->bp_synced && !bp->bp_agreed) {
1154 bp->bp_synced = 0;
1155 bs->bs_allsynced = 0;
1156 }
1157
1158 /* copy the designated pv to the port */
1159 bp->bp_port_pv = bp->bp_desg_pv;
1160 bp->bp_port_msg_age = bp->bp_desg_msg_age;
1161 bp->bp_port_max_age = bp->bp_desg_max_age;
1162 bp->bp_port_fdelay = bp->bp_desg_fdelay;
1163 bp->bp_port_htime = bp->bp_desg_htime;
1164 bp->bp_infois = BSTP_INFO_MINE;
1165
1166 /* Set transmit flag but do not immediately send */
1167 bp->bp_flags |= BSTP_PORT_NEWINFO;
1168}
1169
1170/* set tcprop on every port other than the caller */
1171static void
1172bstp_set_other_tcprop(struct bstp_port *bp)
1173{
1174 struct bstp_state *bs = bp->bp_bs;
1175 struct bstp_port *bp2;
1176
1177 BSTP_LOCK_ASSERT(bs);
1178
1179 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
1180 if (bp2 == bp)
1181 continue;
1182 bp2->bp_tc_prop = 1;
1183 }
1184}
1185
1186static void
1187bstp_set_all_reroot(struct bstp_state *bs)
1188{
1189 struct bstp_port *bp;
1190
1191 BSTP_LOCK_ASSERT(bs);
1192
1193 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
1194 bp->bp_reroot = 1;
1195}
1196
1197static void
1198bstp_set_all_sync(struct bstp_state *bs)
1199{
1200 struct bstp_port *bp;
1201
1202 BSTP_LOCK_ASSERT(bs);
1203
1204 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1205 bp->bp_sync = 1;
1206 bp->bp_synced = 0; /* Not explicit in spec */
1207 }
1208
1209 bs->bs_allsynced = 0;
1210}
1211
1212static void
1213bstp_set_port_state(struct bstp_port *bp, int state)
1214{
1215 if (bp->bp_state == state)
1216 return;
1217
1218 bp->bp_state = state;
1219
1220 switch (bp->bp_state) {
1221 case BSTP_IFSTATE_DISCARDING:
1222 DPRINTF("state changed to DISCARDING on %s\n",
1223 bp->bp_ifp->if_xname);
1224 break;
1225
1226 case BSTP_IFSTATE_LEARNING:
1227 DPRINTF("state changed to LEARNING on %s\n",
1228 bp->bp_ifp->if_xname);
1229
1230 bstp_timer_start(&bp->bp_forward_delay_timer,
1231 bp->bp_protover == BSTP_PROTO_RSTP ?
1232 bp->bp_desg_htime : bp->bp_desg_fdelay);
1233 break;
1234
1235 case BSTP_IFSTATE_FORWARDING:
1236 DPRINTF("state changed to FORWARDING on %s\n",
1237 bp->bp_ifp->if_xname);
1238
1239 bstp_timer_stop(&bp->bp_forward_delay_timer);
1240 /* Record that we enabled forwarding */
1241 bp->bp_forward_transitions++;
1242 break;
1243 }
1244
1245 /* notify the parent bridge */
1246 taskqueue_enqueue(taskqueue_swi, &bp->bp_statetask);
1247}
1248
1249static void
1250bstp_set_port_role(struct bstp_port *bp, int role)
1251{
1252 struct bstp_state *bs = bp->bp_bs;
1253
1254 if (bp->bp_role == role)
1255 return;
1256
1257 /* perform pre-change tasks */
1258 switch (bp->bp_role) {
1259 case BSTP_ROLE_DISABLED:
1260 bstp_timer_start(&bp->bp_forward_delay_timer,
1261 bp->bp_desg_max_age);
1262 break;
1263
1264 case BSTP_ROLE_BACKUP:
1265 bstp_timer_start(&bp->bp_recent_backup_timer,
1266 bp->bp_desg_htime * 2);
1267 /* fall through */
1268 case BSTP_ROLE_ALTERNATE:
1269 bstp_timer_start(&bp->bp_forward_delay_timer,
1270 bp->bp_desg_fdelay);
1271 bp->bp_sync = 0;
1272 bp->bp_synced = 1;
1273 bp->bp_reroot = 0;
1274 break;
1275
1276 case BSTP_ROLE_ROOT:
1277 bstp_timer_start(&bp->bp_recent_root_timer,
1278 BSTP_DEFAULT_FORWARD_DELAY);
1279 break;
1280 }
1281
1282 bp->bp_role = role;
1283 /* clear values not carried between roles */
1284 bp->bp_proposing = 0;
1285 bs->bs_allsynced = 0;
1286
1287 /* initialise the new role */
1288 switch (bp->bp_role) {
1289 case BSTP_ROLE_DISABLED:
1290 case BSTP_ROLE_ALTERNATE:
1291 case BSTP_ROLE_BACKUP:
1292 DPRINTF("%s role -> ALT/BACK/DISABLED\n",
1293 bp->bp_ifp->if_xname);
1294 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
1295 bstp_timer_stop(&bp->bp_recent_root_timer);
1296 bstp_timer_latch(&bp->bp_forward_delay_timer);
1297 bp->bp_sync = 0;
1298 bp->bp_synced = 1;
1299 bp->bp_reroot = 0;
1300 break;
1301
1302 case BSTP_ROLE_ROOT:
1303 DPRINTF("%s role -> ROOT\n",
1304 bp->bp_ifp->if_xname);
1305 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
1306 bstp_timer_latch(&bp->bp_recent_root_timer);
1307 bp->bp_proposing = 0;
1308 break;
1309
1310 case BSTP_ROLE_DESIGNATED:
1311 DPRINTF("%s role -> DESIGNATED\n",
1312 bp->bp_ifp->if_xname);
1313 bstp_timer_start(&bp->bp_hello_timer,
1314 bp->bp_desg_htime);
1315 bp->bp_agree = 0;
1316 break;
1317 }
1318
1319 /* let the TC state know that the role changed */
1320 bstp_update_tc(bp);
1321}
1322
1323static void
1324bstp_set_port_proto(struct bstp_port *bp, int proto)
1325{
1326 struct bstp_state *bs = bp->bp_bs;
1327
1328 /* supported protocol versions */
1329 switch (proto) {
1330 case BSTP_PROTO_STP:
1331 /* we can downgrade protocols only */
1332 bstp_timer_stop(&bp->bp_migrate_delay_timer);
1333 /* clear unsupported features */
1334 bp->bp_operedge = 0;
1335 /* STP compat mode only uses 16 bits of the 32 */
1336 if (bp->bp_path_cost > 65535)
1337 bp->bp_path_cost = 65535;
1338 break;
1339
1340 case BSTP_PROTO_RSTP:
1341 bstp_timer_start(&bp->bp_migrate_delay_timer,
1342 bs->bs_migration_delay);
1343 break;
1344
1345 default:
1346 DPRINTF("Unsupported STP version %d\n", proto);
1347 return;
1348 }
1349
1350 bp->bp_protover = proto;
1351 bp->bp_flags &= ~BSTP_PORT_CANMIGRATE;
1352}
1353
1354static void
1355bstp_set_port_tc(struct bstp_port *bp, int state)
1356{
1357 struct bstp_state *bs = bp->bp_bs;
1358
1359 bp->bp_tcstate = state;
1360
1361 /* initialise the new state */
1362 switch (bp->bp_tcstate) {
1363 case BSTP_TCSTATE_ACTIVE:
1364 DPRINTF("%s -> TC_ACTIVE\n", bp->bp_ifp->if_xname);
1365 /* nothing to do */
1366 break;
1367
1368 case BSTP_TCSTATE_INACTIVE:
1369 bstp_timer_stop(&bp->bp_tc_timer);
1370 /* flush routes on the parent bridge */
1371 bp->bp_fdbflush = 1;
1372 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask);
1373 bp->bp_tc_ack = 0;
1374 DPRINTF("%s -> TC_INACTIVE\n", bp->bp_ifp->if_xname);
1375 break;
1376
1377 case BSTP_TCSTATE_LEARNING:
1378 bp->bp_rcvdtc = 0;
1379 bp->bp_rcvdtcn = 0;
1380 bp->bp_rcvdtca = 0;
1381 bp->bp_tc_prop = 0;
1382 DPRINTF("%s -> TC_LEARNING\n", bp->bp_ifp->if_xname);
1383 break;
1384
1385 case BSTP_TCSTATE_DETECTED:
1386 bstp_set_timer_tc(bp);
1387 bstp_set_other_tcprop(bp);
1388 /* send out notification */
1389 bp->bp_flags |= BSTP_PORT_NEWINFO;
1390 bstp_transmit(bs, bp);
1391 getmicrotime(&bs->bs_last_tc_time);
1392 DPRINTF("%s -> TC_DETECTED\n", bp->bp_ifp->if_xname);
1393 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1394 break;
1395
1396 case BSTP_TCSTATE_TCN:
1397 bstp_set_timer_tc(bp);
1398 DPRINTF("%s -> TC_TCN\n", bp->bp_ifp->if_xname);
1399 /* fall through */
1400 case BSTP_TCSTATE_TC:
1401 bp->bp_rcvdtc = 0;
1402 bp->bp_rcvdtcn = 0;
1403 if (bp->bp_role == BSTP_ROLE_DESIGNATED)
1404 bp->bp_tc_ack = 1;
1405
1406 bstp_set_other_tcprop(bp);
1407 DPRINTF("%s -> TC_TC\n", bp->bp_ifp->if_xname);
1408 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1409 break;
1410
1411 case BSTP_TCSTATE_PROPAG:
1412 /* flush routes on the parent bridge */
1413 bp->bp_fdbflush = 1;
1414 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask);
1415 bp->bp_tc_prop = 0;
1416 bstp_set_timer_tc(bp);
1417 DPRINTF("%s -> TC_PROPAG\n", bp->bp_ifp->if_xname);
1418 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1419 break;
1420
1421 case BSTP_TCSTATE_ACK:
1422 bstp_timer_stop(&bp->bp_tc_timer);
1423 bp->bp_rcvdtca = 0;
1424 DPRINTF("%s -> TC_ACK\n", bp->bp_ifp->if_xname);
1425 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1426 break;
1427 }
1428}
1429
1430static void
1431bstp_set_timer_tc(struct bstp_port *bp)
1432{
1433 struct bstp_state *bs = bp->bp_bs;
1434
1435 if (bp->bp_tc_timer.active)
1436 return;
1437
1438 switch (bp->bp_protover) {
1439 case BSTP_PROTO_RSTP:
1440 bstp_timer_start(&bp->bp_tc_timer,
1441 bp->bp_desg_htime + BSTP_TICK_VAL);
1442 bp->bp_flags |= BSTP_PORT_NEWINFO;
1443 break;
1444
1445 case BSTP_PROTO_STP:
1446 bstp_timer_start(&bp->bp_tc_timer,
1447 bs->bs_root_max_age + bs->bs_root_fdelay);
1448 break;
1449 }
1450}
1451
1452static void
1453bstp_set_timer_msgage(struct bstp_port *bp)
1454{
1455 if (bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR <=
1456 bp->bp_port_max_age) {
1457 bstp_timer_start(&bp->bp_message_age_timer,
1458 bp->bp_port_htime * 3);
1459 } else
1460 /* expires immediately */
1461 bstp_timer_start(&bp->bp_message_age_timer, 0);
1462}
1463
1464static int
1465bstp_rerooted(struct bstp_state *bs, struct bstp_port *bp)
1466{
1467 struct bstp_port *bp2;
1468 int rr_set = 0;
1469
1470 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
1471 if (bp2 == bp)
1472 continue;
1473 if (bp2->bp_recent_root_timer.active) {
1474 rr_set = 1;
1475 break;
1476 }
1477 }
1478 return (!rr_set);
1479}
1480
1481int
1482bstp_set_htime(struct bstp_state *bs, int t)
1483{
1484 /* convert seconds to ticks */
1485 t *= BSTP_TICK_VAL;
1486
1487 /* value can only be changed in leagacy stp mode */
1488 if (bs->bs_protover != BSTP_PROTO_STP)
1489 return (EPERM);
1490
1491 if (t < BSTP_MIN_HELLO_TIME || t > BSTP_MAX_HELLO_TIME)
1492 return (EINVAL);
1493
1494 BSTP_LOCK(bs);
1495 bs->bs_bridge_htime = t;
1496 bstp_reinit(bs);
1497 BSTP_UNLOCK(bs);
1498 return (0);
1499}
1500
1501int
1502bstp_set_fdelay(struct bstp_state *bs, int t)
1503{
1504 /* convert seconds to ticks */
1505 t *= BSTP_TICK_VAL;
1506
1507 if (t < BSTP_MIN_FORWARD_DELAY || t > BSTP_MAX_FORWARD_DELAY)
1508 return (EINVAL);
1509
1510 BSTP_LOCK(bs);
1511 bs->bs_bridge_fdelay = t;
1512 bstp_reinit(bs);
1513 BSTP_UNLOCK(bs);
1514 return (0);
1515}
1516
1517int
1518bstp_set_maxage(struct bstp_state *bs, int t)
1519{
1520 /* convert seconds to ticks */
1521 t *= BSTP_TICK_VAL;
1522
1523 if (t < BSTP_MIN_MAX_AGE || t > BSTP_MAX_MAX_AGE)
1524 return (EINVAL);
1525
1526 BSTP_LOCK(bs);
1527 bs->bs_bridge_max_age = t;
1528 bstp_reinit(bs);
1529 BSTP_UNLOCK(bs);
1530 return (0);
1531}
1532
1533int
1534bstp_set_holdcount(struct bstp_state *bs, int count)
1535{
1536 struct bstp_port *bp;
1537
1538 if (count < BSTP_MIN_HOLD_COUNT ||
1539 count > BSTP_MAX_HOLD_COUNT)
1540 return (EINVAL);
1541
1542 BSTP_LOCK(bs);
1543 bs->bs_txholdcount = count;
1544 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
1545 bp->bp_txcount = 0;
1546 BSTP_UNLOCK(bs);
1547 return (0);
1548}
1549
1550int
1551bstp_set_protocol(struct bstp_state *bs, int proto)
1552{
1553 struct bstp_port *bp;
1554
1555 switch (proto) {
1556 /* Supported protocol versions */
1557 case BSTP_PROTO_STP:
1558 case BSTP_PROTO_RSTP:
1559 break;
1560
1561 default:
1562 return (EINVAL);
1563 }
1564
1565 BSTP_LOCK(bs);
1566 bs->bs_protover = proto;
1567 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME;
1568 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1569 /* reinit state */
1570 bp->bp_infois = BSTP_INFO_DISABLED;
1571 bp->bp_txcount = 0;
1572 bstp_set_port_proto(bp, bs->bs_protover);
1573 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
1574 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
1575 bstp_timer_stop(&bp->bp_recent_backup_timer);
1576 }
1577 bstp_reinit(bs);
1578 BSTP_UNLOCK(bs);
1579 return (0);
1580}
1581
1582int
1583bstp_set_priority(struct bstp_state *bs, int pri)
1584{
1585 if (pri < 0 || pri > BSTP_MAX_PRIORITY)
1586 return (EINVAL);
1587
1588 /* Limit to steps of 4096 */
1589 pri -= pri % 4096;
1590
1591 BSTP_LOCK(bs);
1592 bs->bs_bridge_priority = pri;
1593 bstp_reinit(bs);
1594 BSTP_UNLOCK(bs);
1595 return (0);
1596}
1597
1598int
1599bstp_set_port_priority(struct bstp_port *bp, int pri)
1600{
1601 struct bstp_state *bs = bp->bp_bs;
1602
1603 if (pri < 0 || pri > BSTP_MAX_PORT_PRIORITY)
1604 return (EINVAL);
1605
1606 /* Limit to steps of 16 */
1607 pri -= pri % 16;
1608
1609 BSTP_LOCK(bs);
1610 bp->bp_priority = pri;
1611 bstp_reinit(bs);
1612 BSTP_UNLOCK(bs);
1613 return (0);
1614}
1615
1616int
1617bstp_set_path_cost(struct bstp_port *bp, uint32_t path_cost)
1618{
1619 struct bstp_state *bs = bp->bp_bs;
1620
1621 if (path_cost > BSTP_MAX_PATH_COST)
1622 return (EINVAL);
1623
1624 /* STP compat mode only uses 16 bits of the 32 */
1625 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535)
1626 path_cost = 65535;
1627
1628 BSTP_LOCK(bs);
1629
1630 if (path_cost == 0) { /* use auto */
1631 bp->bp_flags &= ~BSTP_PORT_ADMCOST;
1632 bp->bp_path_cost = bstp_calc_path_cost(bp);
1633 } else {
1634 bp->bp_path_cost = path_cost;
1635 bp->bp_flags |= BSTP_PORT_ADMCOST;
1636 }
1637 bstp_reinit(bs);
1638 BSTP_UNLOCK(bs);
1639 return (0);
1640}
1641
1642int
1643bstp_set_edge(struct bstp_port *bp, int set)
1644{
1645 struct bstp_state *bs = bp->bp_bs;
1646
1647 BSTP_LOCK(bs);
1648 if ((bp->bp_operedge = set) == 0)
1649 bp->bp_flags &= ~BSTP_PORT_ADMEDGE;
1650 else
1651 bp->bp_flags |= BSTP_PORT_ADMEDGE;
1652 BSTP_UNLOCK(bs);
1653 return (0);
1654}
1655
1656int
1657bstp_set_autoedge(struct bstp_port *bp, int set)
1658{
1659 struct bstp_state *bs = bp->bp_bs;
1660
1661 BSTP_LOCK(bs);
1662 if (set) {
1663 bp->bp_flags |= BSTP_PORT_AUTOEDGE;
1664 /* we may be able to transition straight to edge */
1665 if (bp->bp_edge_delay_timer.active == 0)
1666 bstp_edge_delay_expiry(bs, bp);
1667 } else
1668 bp->bp_flags &= ~BSTP_PORT_AUTOEDGE;
1669 BSTP_UNLOCK(bs);
1670 return (0);
1671}
1672
1673int
1674bstp_set_ptp(struct bstp_port *bp, int set)
1675{
1676 struct bstp_state *bs = bp->bp_bs;
1677
1678 BSTP_LOCK(bs);
1679 bp->bp_ptp_link = set;
1680 BSTP_UNLOCK(bs);
1681 return (0);
1682}
1683
1684int
1685bstp_set_autoptp(struct bstp_port *bp, int set)
1686{
1687 struct bstp_state *bs = bp->bp_bs;
1688
1689 BSTP_LOCK(bs);
1690 if (set) {
1691 bp->bp_flags |= BSTP_PORT_AUTOPTP;
1692 if (bp->bp_role != BSTP_ROLE_DISABLED)
1693 bstp_ifupdstatus(bs, bp);
1694 } else
1695 bp->bp_flags &= ~BSTP_PORT_AUTOPTP;
1696 BSTP_UNLOCK(bs);
1697 return (0);
1698}
1699
1700/*
1701 * Calculate the path cost according to the link speed.
1702 */
1703static uint32_t
1704bstp_calc_path_cost(struct bstp_port *bp)
1705{
1706 struct ifnet *ifp = bp->bp_ifp;
1707 uint32_t path_cost;
1708
1709 /* If the priority has been manually set then retain the value */
1710 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1711 return bp->bp_path_cost;
1712
1713 if (ifp->if_link_state == LINK_STATE_DOWN) {
1714 /* Recalc when the link comes up again */
1715 bp->bp_flags |= BSTP_PORT_PNDCOST;
1716 return (BSTP_DEFAULT_PATH_COST);
1717 }
1718
1719 if (ifp->if_baudrate < 1000)
1720 return (BSTP_DEFAULT_PATH_COST);
1721
1722 /* formula from section 17.14, IEEE Std 802.1D-2004 */
1723 path_cost = 20000000000ULL / (ifp->if_baudrate / 1000);
1724
1725 if (path_cost > BSTP_MAX_PATH_COST)
1726 path_cost = BSTP_MAX_PATH_COST;
1727
1728 /* STP compat mode only uses 16 bits of the 32 */
1729 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535)
1730 path_cost = 65535;
1731
1732 return (path_cost);
1733}
1734
1735/*
1736 * Notify the bridge that a port state has changed, we need to do this from a
1737 * taskqueue to avoid a LOR.
1738 */
1739static void
1740bstp_notify_state(void *arg, int pending)
1741{
1742 struct bstp_port *bp = (struct bstp_port *)arg;
1743 struct bstp_state *bs = bp->bp_bs;
1744
1745 if (bp->bp_active == 1 && bs->bs_state_cb != NULL)
1746 (*bs->bs_state_cb)(bp->bp_ifp, bp->bp_state);
1747}
1748
1749/*
1750 * Flush the routes on the bridge port, we need to do this from a
1751 * taskqueue to avoid a LOR.
1752 */
1753static void
1754bstp_notify_rtage(void *arg, int pending)
1755{
1756 struct bstp_port *bp = (struct bstp_port *)arg;
1757 struct bstp_state *bs = bp->bp_bs;
1758 int age = 0;
1759
1760 BSTP_LOCK(bs);
1761 switch (bp->bp_protover) {
1762 case BSTP_PROTO_STP:
1763 /* convert to seconds */
1764 age = bp->bp_desg_fdelay / BSTP_TICK_VAL;
1765 break;
1766
1767 case BSTP_PROTO_RSTP:
1768 age = 0;
1769 break;
1770 }
1771 BSTP_UNLOCK(bs);
1772
1773 if (bp->bp_active == 1 && bs->bs_rtage_cb != NULL)
1774 (*bs->bs_rtage_cb)(bp->bp_ifp, age);
1775
1776 /* flush is complete */
1777 BSTP_LOCK(bs);
1778 bp->bp_fdbflush = 0;
1779 BSTP_UNLOCK(bs);
1780}
1781
1782void
1783bstp_linkstate(struct ifnet *ifp, int state)
1784{
1785 struct bstp_state *bs;
1786 struct bstp_port *bp;
1787
1788 /* search for the stp port */
1789 mtx_lock(&bstp_list_mtx);
1790 LIST_FOREACH(bs, &bstp_list, bs_list) {
1791 BSTP_LOCK(bs);
1792 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1793 if (bp->bp_ifp == ifp) {
1794 bstp_ifupdstatus(bs, bp);
1795 bstp_update_state(bs, bp);
1796 /* it only exists once so return */
1797 BSTP_UNLOCK(bs);
1798 mtx_unlock(&bstp_list_mtx);
1799 return;
1800 }
1801 }
1802 BSTP_UNLOCK(bs);
1803 }
1804 mtx_unlock(&bstp_list_mtx);
1805}
1806
1807static void
1808bstp_ifupdstatus(struct bstp_state *bs, struct bstp_port *bp)
1809{
1810 struct ifnet *ifp = bp->bp_ifp;
1811 struct ifmediareq ifmr;
1812 int error = 0;
1813
1814 BSTP_LOCK_ASSERT(bs);
1815
1816 bzero((char *)&ifmr, sizeof(ifmr));
1817 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
1818
1819 if ((error == 0) && (ifp->if_flags & IFF_UP)) {
1820 if (ifmr.ifm_status & IFM_ACTIVE) {
1821 /* A full-duplex link is assumed to be point to point */
1822 if (bp->bp_flags & BSTP_PORT_AUTOPTP) {
1823 bp->bp_ptp_link =
1824 ifmr.ifm_active & IFM_FDX ? 1 : 0;
1825 }
1826
1827 /* Calc the cost if the link was down previously */
1828 if (bp->bp_flags & BSTP_PORT_PNDCOST) {
1829 bp->bp_path_cost = bstp_calc_path_cost(bp);
1830 bp->bp_flags &= ~BSTP_PORT_PNDCOST;
1831 }
1832
1833 if (bp->bp_role == BSTP_ROLE_DISABLED)
1834 bstp_enable_port(bs, bp);
1835 } else {
1836 if (bp->bp_role != BSTP_ROLE_DISABLED) {
1837 bstp_disable_port(bs, bp);
1838 if ((bp->bp_flags & BSTP_PORT_ADMEDGE) &&
1839 bp->bp_protover == BSTP_PROTO_RSTP)
1840 bp->bp_operedge = 1;
1841 }
1842 }
1843 return;
1844 }
1845
1846 if (bp->bp_infois != BSTP_INFO_DISABLED)
1847 bstp_disable_port(bs, bp);
1848}
1849
1850static void
1851bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp)
1852{
1853 bp->bp_infois = BSTP_INFO_AGED;
1854 bstp_assign_roles(bs);
1855}
1856
1857static void
1858bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp)
1859{
1860 bp->bp_infois = BSTP_INFO_DISABLED;
1861 bstp_assign_roles(bs);
1862}
1863
1864static void
1865bstp_tick(void *arg)
1866{
1867 struct bstp_state *bs = arg;
1868 struct bstp_port *bp;
1869
1870 BSTP_LOCK_ASSERT(bs);
1871
1872 if (bs->bs_running == 0)
1873 return;
1874
1875 /* slow timer to catch missed link events */
1876 if (bstp_timer_expired(&bs->bs_link_timer)) {
1877 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
1878 bstp_ifupdstatus(bs, bp);
1879 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER);
1880 }
1881
1882 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1883 /* no events need to happen for these */
1884 bstp_timer_expired(&bp->bp_tc_timer);
1885 bstp_timer_expired(&bp->bp_recent_root_timer);
1886 bstp_timer_expired(&bp->bp_forward_delay_timer);
1887 bstp_timer_expired(&bp->bp_recent_backup_timer);
1888
1889 if (bstp_timer_expired(&bp->bp_hello_timer))
1890 bstp_hello_timer_expiry(bs, bp);
1891
1892 if (bstp_timer_expired(&bp->bp_message_age_timer))
1893 bstp_message_age_expiry(bs, bp);
1894
1895 if (bstp_timer_expired(&bp->bp_migrate_delay_timer))
1896 bstp_migrate_delay_expiry(bs, bp);
1897
1898 if (bstp_timer_expired(&bp->bp_edge_delay_timer))
1899 bstp_edge_delay_expiry(bs, bp);
1900
1901 /* update the various state machines for the port */
1902 bstp_update_state(bs, bp);
1903
1904 if (bp->bp_txcount > 0)
1905 bp->bp_txcount--;
1906 }
1907
1908 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs);
1909}
1910
1911static void
1912bstp_timer_start(struct bstp_timer *t, uint16_t v)
1913{
1914 t->value = v;
1915 t->active = 1;
1916 t->latched = 0;
1917}
1918
1919static void
1920bstp_timer_stop(struct bstp_timer *t)
1921{
1922 t->value = 0;
1923 t->active = 0;
1924 t->latched = 0;
1925}
1926
1927static void
1928bstp_timer_latch(struct bstp_timer *t)
1929{
1930 t->latched = 1;
1931 t->active = 1;
1932}
1933
1934static int
1935bstp_timer_expired(struct bstp_timer *t)
1936{
1937 if (t->active == 0 || t->latched)
1938 return (0);
1939 t->value -= BSTP_TICK_VAL;
1940 if (t->value <= 0) {
1941 bstp_timer_stop(t);
1942 return (1);
1943 }
1944 return (0);
1945}
1946
1947static void
1948bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp)
1949{
1950 if ((bp->bp_flags & BSTP_PORT_NEWINFO) ||
1951 bp->bp_role == BSTP_ROLE_DESIGNATED ||
1952 (bp->bp_role == BSTP_ROLE_ROOT &&
1953 bp->bp_tc_timer.active == 1)) {
1954 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime);
1955 bp->bp_flags |= BSTP_PORT_NEWINFO;
1956 bstp_transmit(bs, bp);
1957 }
1958}
1959
1960static void
1961bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp)
1962{
1963 if (bp->bp_infois == BSTP_INFO_RECEIVED) {
1964 bp->bp_infois = BSTP_INFO_AGED;
1965 bstp_assign_roles(bs);
1966 DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname);
1967 }
1968}
1969
1970static void
1971bstp_migrate_delay_expiry(struct bstp_state *bs, struct bstp_port *bp)
1972{
1973 bp->bp_flags |= BSTP_PORT_CANMIGRATE;
1974}
1975
1976static void
1977bstp_edge_delay_expiry(struct bstp_state *bs, struct bstp_port *bp)
1978{
1979 if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) &&
1980 bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing &&
1981 bp->bp_role == BSTP_ROLE_DESIGNATED) {
1982 bp->bp_operedge = 1;
1983 DPRINTF("%s -> edge port\n", bp->bp_ifp->if_xname);
1984 }
1985}
1986
1987static int
1988bstp_addr_cmp(const uint8_t *a, const uint8_t *b)
1989{
1990 int i, d;
1991
1992 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
1993 d = ((int)a[i]) - ((int)b[i]);
1994 }
1995
1996 return (d);
1997}
1998
1999/*
2000 * compare the bridge address component of the bridgeid
2001 */
2002static int
2003bstp_same_bridgeid(uint64_t id1, uint64_t id2)
2004{
2005 u_char addr1[ETHER_ADDR_LEN];
2006 u_char addr2[ETHER_ADDR_LEN];
2007
2008 PV2ADDR(id1, addr1);
2009 PV2ADDR(id2, addr2);
2010
2011 if (bstp_addr_cmp(addr1, addr2) == 0)
2012 return (1);
2013
2014 return (0);
2015}
2016
2017void
2018bstp_reinit(struct bstp_state *bs)
2019{
2020 INIT_VNET_NET(curvnet);
2021 struct bstp_port *bp;
2022 struct ifnet *ifp, *mif;
2023 u_char *e_addr;
2024 static const u_char llzero[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
2025
2026 BSTP_LOCK_ASSERT(bs);
2027
2028 mif = NULL;
2029 /*
2030 * Search through the Ethernet adapters and find the one with the
2031 * lowest value. The adapter which we take the MAC address from does
2032 * not need to be part of the bridge, it just needs to be a unique
2033 * value.
2034 */
2035 IFNET_RLOCK();
2036 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2037 if (ifp->if_type != IFT_ETHER)
2038 continue;
2039
2040 if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0)
2041 continue;
2042
2043 if (mif == NULL) {
2044 mif = ifp;
2045 continue;
2046 }
2047 if (bstp_addr_cmp(IF_LLADDR(ifp), IF_LLADDR(mif)) < 0) {
2048 mif = ifp;
2049 continue;
2050 }
2051 }
2052 IFNET_RUNLOCK();
2053
2054 if (LIST_EMPTY(&bs->bs_bplist) || mif == NULL) {
2055 /* Set the bridge and root id (lower bits) to zero */
2056 bs->bs_bridge_pv.pv_dbridge_id =
2057 ((uint64_t)bs->bs_bridge_priority) << 48;
2058 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id;
2059 bs->bs_root_pv = bs->bs_bridge_pv;
2060 /* Disable any remaining ports, they will have no MAC address */
2061 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
2062 bp->bp_infois = BSTP_INFO_DISABLED;
2063 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
2064 }
2065 callout_stop(&bs->bs_bstpcallout);
2066 return;
2067 }
2068
2069 e_addr = IF_LLADDR(mif);
2070 bs->bs_bridge_pv.pv_dbridge_id =
2071 (((uint64_t)bs->bs_bridge_priority) << 48) |
2072 (((uint64_t)e_addr[0]) << 40) |
2073 (((uint64_t)e_addr[1]) << 32) |
2074 (((uint64_t)e_addr[2]) << 24) |
2075 (((uint64_t)e_addr[3]) << 16) |
2076 (((uint64_t)e_addr[4]) << 8) |
2077 (((uint64_t)e_addr[5]));
2078
2079 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id;
2080 bs->bs_bridge_pv.pv_cost = 0;
2081 bs->bs_bridge_pv.pv_dport_id = 0;
2082 bs->bs_bridge_pv.pv_port_id = 0;
2083
2084 if (bs->bs_running && callout_pending(&bs->bs_bstpcallout) == 0)
2085 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs);
2086
2087 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
2088 bp->bp_port_id = (bp->bp_priority << 8) |
2089 (bp->bp_ifp->if_index & 0xfff);
2090 bstp_ifupdstatus(bs, bp);
2091 }
2092
2093 bstp_assign_roles(bs);
2094 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER);
2095}
2096
2097static int
2098bstp_modevent(module_t mod, int type, void *data)
2099{
2100 switch (type) {
2101 case MOD_LOAD:
2102 mtx_init(&bstp_list_mtx, "bridgestp list", NULL, MTX_DEF);
2103 LIST_INIT(&bstp_list);
2104 bstp_linkstate_p = bstp_linkstate;
2105 break;
2106 case MOD_UNLOAD:
2107 bstp_linkstate_p = NULL;
2108 mtx_destroy(&bstp_list_mtx);
2109 break;
2110 default:
2111 return (EOPNOTSUPP);
2112 }
2113 return (0);
2114}
2115
2116static moduledata_t bstp_mod = {
2117 "bridgestp",
2118 bstp_modevent,
2119 0
2120};
2121
2122DECLARE_MODULE(bridgestp, bstp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
2123MODULE_VERSION(bridgestp, 1);
2124
2125void
2126bstp_attach(struct bstp_state *bs, struct bstp_cb_ops *cb)
2127{
2128 BSTP_LOCK_INIT(bs);
2129 callout_init_mtx(&bs->bs_bstpcallout, &bs->bs_mtx, 0);
2130 LIST_INIT(&bs->bs_bplist);
2131
2132 bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE;
2133 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME;
2134 bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY;
2135 bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY;
2136 bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME;
2137 bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY;
2138 bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT;
2139 bs->bs_protover = BSTP_PROTO_RSTP;
2140 bs->bs_state_cb = cb->bcb_state;
2141 bs->bs_rtage_cb = cb->bcb_rtage;
2142
2143 getmicrotime(&bs->bs_last_tc_time);
2144
2145 mtx_lock(&bstp_list_mtx);
2146 LIST_INSERT_HEAD(&bstp_list, bs, bs_list);
2147 mtx_unlock(&bstp_list_mtx);
2148}
2149
2150void
2151bstp_detach(struct bstp_state *bs)
2152{
2153 KASSERT(LIST_EMPTY(&bs->bs_bplist), ("bstp still active"));
2154
2155 mtx_lock(&bstp_list_mtx);
2156 LIST_REMOVE(bs, bs_list);
2157 mtx_unlock(&bstp_list_mtx);
2158 callout_drain(&bs->bs_bstpcallout);
2159 BSTP_LOCK_DESTROY(bs);
2160}
2161
2162void
2163bstp_init(struct bstp_state *bs)
2164{
2165 BSTP_LOCK(bs);
2166 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs);
2167 bs->bs_running = 1;
2168 bstp_reinit(bs);
2169 BSTP_UNLOCK(bs);
2170}
2171
2172void
2173bstp_stop(struct bstp_state *bs)
2174{
2175 struct bstp_port *bp;
2176
2177 BSTP_LOCK(bs);
2178
2179 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
2180 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
2181
2182 bs->bs_running = 0;
2183 callout_stop(&bs->bs_bstpcallout);
2184 BSTP_UNLOCK(bs);
2185}
2186
2187int
2188bstp_create(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *ifp)
2189{
2190 bzero(bp, sizeof(struct bstp_port));
2191
2192 BSTP_LOCK(bs);
2193 bp->bp_ifp = ifp;
2194 bp->bp_bs = bs;
2195 bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY;
2196 TASK_INIT(&bp->bp_statetask, 0, bstp_notify_state, bp);
2197 TASK_INIT(&bp->bp_rtagetask, 0, bstp_notify_rtage, bp);
2198
2199 /* Init state */
2200 bp->bp_infois = BSTP_INFO_DISABLED;
2201 bp->bp_flags = BSTP_PORT_AUTOEDGE|BSTP_PORT_AUTOPTP;
2202 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
2203 bstp_set_port_proto(bp, bs->bs_protover);
2204 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
2205 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
2206 bp->bp_path_cost = bstp_calc_path_cost(bp);
2207 BSTP_UNLOCK(bs);
2208 return (0);
2209}
2210
2211int
2212bstp_enable(struct bstp_port *bp)
2213{
2214 struct bstp_state *bs = bp->bp_bs;
2215 struct ifnet *ifp = bp->bp_ifp;
2216
2217 KASSERT(bp->bp_active == 0, ("already a bstp member"));
2218
2219 switch (ifp->if_type) {
2220 case IFT_ETHER: /* These can do spanning tree. */
2221 break;
2222 default:
2223 /* Nothing else can. */
2224 return (EINVAL);
2225 }
2226
2227 BSTP_LOCK(bs);
2228 LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next);
2229 bp->bp_active = 1;
2230 bp->bp_flags |= BSTP_PORT_NEWINFO;
2231 bstp_reinit(bs);
2232 bstp_update_roles(bs, bp);
2233 BSTP_UNLOCK(bs);
2234 return (0);
2235}
2236
2237void
2238bstp_disable(struct bstp_port *bp)
2239{
2240 struct bstp_state *bs = bp->bp_bs;
2241
2242 KASSERT(bp->bp_active == 1, ("not a bstp member"));
2243
2244 BSTP_LOCK(bs);
2245 bstp_disable_port(bs, bp);
2246 LIST_REMOVE(bp, bp_next);
2247 bp->bp_active = 0;
2248 bstp_reinit(bs);
2249 BSTP_UNLOCK(bs);
2250}
2251
2252/*
2253 * The bstp_port structure is about to be freed by the parent bridge.
2254 */
2255void
2256bstp_destroy(struct bstp_port *bp)
2257{
2258 KASSERT(bp->bp_active == 0, ("port is still attached"));
2259 taskqueue_drain(taskqueue_swi, &bp->bp_statetask);
2260 taskqueue_drain(taskqueue_swi, &bp->bp_rtagetask);
2261}
| 60
61#include <netinet/in.h>
62#include <netinet/in_systm.h>
63#include <netinet/in_var.h>
64#include <netinet/if_ether.h>
65#include <net/bridgestp.h>
66
67#ifdef BRIDGESTP_DEBUG
68#define DPRINTF(fmt, arg...) printf("bstp: " fmt, ##arg)
69#else
70#define DPRINTF(fmt, arg...)
71#endif
72
73#define PV2ADDR(pv, eaddr) do { \
74 eaddr[0] = pv >> 40; \
75 eaddr[1] = pv >> 32; \
76 eaddr[2] = pv >> 24; \
77 eaddr[3] = pv >> 16; \
78 eaddr[4] = pv >> 8; \
79 eaddr[5] = pv >> 0; \
80} while (0)
81
82#define INFO_BETTER 1
83#define INFO_SAME 0
84#define INFO_WORSE -1
85
86const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
87
88LIST_HEAD(, bstp_state) bstp_list;
89static struct mtx bstp_list_mtx;
90
91static void bstp_transmit(struct bstp_state *, struct bstp_port *);
92static void bstp_transmit_bpdu(struct bstp_state *, struct bstp_port *);
93static void bstp_transmit_tcn(struct bstp_state *, struct bstp_port *);
94static void bstp_decode_bpdu(struct bstp_port *, struct bstp_cbpdu *,
95 struct bstp_config_unit *);
96static void bstp_send_bpdu(struct bstp_state *, struct bstp_port *,
97 struct bstp_cbpdu *);
98static void bstp_enqueue(struct ifnet *, struct mbuf *);
99static int bstp_pdu_flags(struct bstp_port *);
100static void bstp_received_stp(struct bstp_state *, struct bstp_port *,
101 struct mbuf **, struct bstp_tbpdu *);
102static void bstp_received_rstp(struct bstp_state *, struct bstp_port *,
103 struct mbuf **, struct bstp_tbpdu *);
104static void bstp_received_tcn(struct bstp_state *, struct bstp_port *,
105 struct bstp_tcn_unit *);
106static void bstp_received_bpdu(struct bstp_state *, struct bstp_port *,
107 struct bstp_config_unit *);
108static int bstp_pdu_rcvtype(struct bstp_port *, struct bstp_config_unit *);
109static int bstp_pdu_bettersame(struct bstp_port *, int);
110static int bstp_info_cmp(struct bstp_pri_vector *,
111 struct bstp_pri_vector *);
112static int bstp_info_superior(struct bstp_pri_vector *,
113 struct bstp_pri_vector *);
114static void bstp_assign_roles(struct bstp_state *);
115static void bstp_update_roles(struct bstp_state *, struct bstp_port *);
116static void bstp_update_state(struct bstp_state *, struct bstp_port *);
117static void bstp_update_tc(struct bstp_port *);
118static void bstp_update_info(struct bstp_port *);
119static void bstp_set_other_tcprop(struct bstp_port *);
120static void bstp_set_all_reroot(struct bstp_state *);
121static void bstp_set_all_sync(struct bstp_state *);
122static void bstp_set_port_state(struct bstp_port *, int);
123static void bstp_set_port_role(struct bstp_port *, int);
124static void bstp_set_port_proto(struct bstp_port *, int);
125static void bstp_set_port_tc(struct bstp_port *, int);
126static void bstp_set_timer_tc(struct bstp_port *);
127static void bstp_set_timer_msgage(struct bstp_port *);
128static int bstp_rerooted(struct bstp_state *, struct bstp_port *);
129static uint32_t bstp_calc_path_cost(struct bstp_port *);
130static void bstp_notify_state(void *, int);
131static void bstp_notify_rtage(void *, int);
132static void bstp_ifupdstatus(struct bstp_state *, struct bstp_port *);
133static void bstp_enable_port(struct bstp_state *, struct bstp_port *);
134static void bstp_disable_port(struct bstp_state *, struct bstp_port *);
135static void bstp_tick(void *);
136static void bstp_timer_start(struct bstp_timer *, uint16_t);
137static void bstp_timer_stop(struct bstp_timer *);
138static void bstp_timer_latch(struct bstp_timer *);
139static int bstp_timer_expired(struct bstp_timer *);
140static void bstp_hello_timer_expiry(struct bstp_state *,
141 struct bstp_port *);
142static void bstp_message_age_expiry(struct bstp_state *,
143 struct bstp_port *);
144static void bstp_migrate_delay_expiry(struct bstp_state *,
145 struct bstp_port *);
146static void bstp_edge_delay_expiry(struct bstp_state *,
147 struct bstp_port *);
148static int bstp_addr_cmp(const uint8_t *, const uint8_t *);
149static int bstp_same_bridgeid(uint64_t, uint64_t);
150static void bstp_reinit(struct bstp_state *);
151
152static void
153bstp_transmit(struct bstp_state *bs, struct bstp_port *bp)
154{
155 if (bs->bs_running == 0)
156 return;
157
158 /*
159 * a PDU can only be sent if we have tx quota left and the
160 * hello timer is running.
161 */
162 if (bp->bp_hello_timer.active == 0) {
163 /* Test if it needs to be reset */
164 bstp_hello_timer_expiry(bs, bp);
165 return;
166 }
167 if (bp->bp_txcount > bs->bs_txholdcount)
168 /* Ran out of karma */
169 return;
170
171 if (bp->bp_protover == BSTP_PROTO_RSTP) {
172 bstp_transmit_bpdu(bs, bp);
173 bp->bp_tc_ack = 0;
174 } else { /* STP */
175 switch (bp->bp_role) {
176 case BSTP_ROLE_DESIGNATED:
177 bstp_transmit_bpdu(bs, bp);
178 bp->bp_tc_ack = 0;
179 break;
180
181 case BSTP_ROLE_ROOT:
182 bstp_transmit_tcn(bs, bp);
183 break;
184 }
185 }
186 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime);
187 bp->bp_flags &= ~BSTP_PORT_NEWINFO;
188}
189
190static void
191bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp)
192{
193 struct bstp_cbpdu bpdu;
194
195 BSTP_LOCK_ASSERT(bs);
196
197 bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48);
198 PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr);
199
200 bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost);
201
202 bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48);
203 PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr);
204
205 bpdu.cbu_portid = htons(bp->bp_port_id);
206 bpdu.cbu_messageage = htons(bp->bp_desg_msg_age);
207 bpdu.cbu_maxage = htons(bp->bp_desg_max_age);
208 bpdu.cbu_hellotime = htons(bp->bp_desg_htime);
209 bpdu.cbu_forwarddelay = htons(bp->bp_desg_fdelay);
210
211 bpdu.cbu_flags = bstp_pdu_flags(bp);
212
213 switch (bp->bp_protover) {
214 case BSTP_PROTO_STP:
215 bpdu.cbu_bpdutype = BSTP_MSGTYPE_CFG;
216 break;
217
218 case BSTP_PROTO_RSTP:
219 bpdu.cbu_bpdutype = BSTP_MSGTYPE_RSTP;
220 break;
221 }
222
223 bstp_send_bpdu(bs, bp, &bpdu);
224}
225
226static void
227bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp)
228{
229 struct bstp_tbpdu bpdu;
230 struct ifnet *ifp = bp->bp_ifp;
231 struct ether_header *eh;
232 struct mbuf *m;
233
234 KASSERT(bp == bs->bs_root_port, ("%s: bad root port\n", __func__));
235
236 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
237 return;
238
239 MGETHDR(m, M_DONTWAIT, MT_DATA);
240 if (m == NULL)
241 return;
242
243 m->m_pkthdr.rcvif = ifp;
244 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu);
245 m->m_len = m->m_pkthdr.len;
246
247 eh = mtod(m, struct ether_header *);
248
249 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
250 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
251 eh->ether_type = htons(sizeof(bpdu));
252
253 bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP;
254 bpdu.tbu_ctl = LLC_UI;
255 bpdu.tbu_protoid = 0;
256 bpdu.tbu_protover = 0;
257 bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN;
258
259 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu));
260
261 bp->bp_txcount++;
262 bstp_enqueue(ifp, m);
263}
264
265static void
266bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu,
267 struct bstp_config_unit *cu)
268{
269 int flags;
270
271 cu->cu_pv.pv_root_id =
272 (((uint64_t)ntohs(cpdu->cbu_rootpri)) << 48) |
273 (((uint64_t)cpdu->cbu_rootaddr[0]) << 40) |
274 (((uint64_t)cpdu->cbu_rootaddr[1]) << 32) |
275 (((uint64_t)cpdu->cbu_rootaddr[2]) << 24) |
276 (((uint64_t)cpdu->cbu_rootaddr[3]) << 16) |
277 (((uint64_t)cpdu->cbu_rootaddr[4]) << 8) |
278 (((uint64_t)cpdu->cbu_rootaddr[5]) << 0);
279
280 cu->cu_pv.pv_dbridge_id =
281 (((uint64_t)ntohs(cpdu->cbu_bridgepri)) << 48) |
282 (((uint64_t)cpdu->cbu_bridgeaddr[0]) << 40) |
283 (((uint64_t)cpdu->cbu_bridgeaddr[1]) << 32) |
284 (((uint64_t)cpdu->cbu_bridgeaddr[2]) << 24) |
285 (((uint64_t)cpdu->cbu_bridgeaddr[3]) << 16) |
286 (((uint64_t)cpdu->cbu_bridgeaddr[4]) << 8) |
287 (((uint64_t)cpdu->cbu_bridgeaddr[5]) << 0);
288
289 cu->cu_pv.pv_cost = ntohl(cpdu->cbu_rootpathcost);
290 cu->cu_message_age = ntohs(cpdu->cbu_messageage);
291 cu->cu_max_age = ntohs(cpdu->cbu_maxage);
292 cu->cu_hello_time = ntohs(cpdu->cbu_hellotime);
293 cu->cu_forward_delay = ntohs(cpdu->cbu_forwarddelay);
294 cu->cu_pv.pv_dport_id = ntohs(cpdu->cbu_portid);
295 cu->cu_pv.pv_port_id = bp->bp_port_id;
296 cu->cu_message_type = cpdu->cbu_bpdutype;
297
298 /* Strip off unused flags in STP mode */
299 flags = cpdu->cbu_flags;
300 switch (cpdu->cbu_protover) {
301 case BSTP_PROTO_STP:
302 flags &= BSTP_PDU_STPMASK;
303 /* A STP BPDU explicitly conveys a Designated Port */
304 cu->cu_role = BSTP_ROLE_DESIGNATED;
305 break;
306
307 case BSTP_PROTO_RSTP:
308 flags &= BSTP_PDU_RSTPMASK;
309 break;
310 }
311
312 cu->cu_topology_change_ack =
313 (flags & BSTP_PDU_F_TCA) ? 1 : 0;
314 cu->cu_proposal =
315 (flags & BSTP_PDU_F_P) ? 1 : 0;
316 cu->cu_agree =
317 (flags & BSTP_PDU_F_A) ? 1 : 0;
318 cu->cu_learning =
319 (flags & BSTP_PDU_F_L) ? 1 : 0;
320 cu->cu_forwarding =
321 (flags & BSTP_PDU_F_F) ? 1 : 0;
322 cu->cu_topology_change =
323 (flags & BSTP_PDU_F_TC) ? 1 : 0;
324
325 switch ((flags & BSTP_PDU_PRMASK) >> BSTP_PDU_PRSHIFT) {
326 case BSTP_PDU_F_ROOT:
327 cu->cu_role = BSTP_ROLE_ROOT;
328 break;
329 case BSTP_PDU_F_ALT:
330 cu->cu_role = BSTP_ROLE_ALTERNATE;
331 break;
332 case BSTP_PDU_F_DESG:
333 cu->cu_role = BSTP_ROLE_DESIGNATED;
334 break;
335 }
336}
337
338static void
339bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp,
340 struct bstp_cbpdu *bpdu)
341{
342 struct ifnet *ifp;
343 struct mbuf *m;
344 struct ether_header *eh;
345
346 BSTP_LOCK_ASSERT(bs);
347
348 ifp = bp->bp_ifp;
349
350 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
351 return;
352
353 MGETHDR(m, M_DONTWAIT, MT_DATA);
354 if (m == NULL)
355 return;
356
357 eh = mtod(m, struct ether_header *);
358
359 bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP;
360 bpdu->cbu_ctl = LLC_UI;
361 bpdu->cbu_protoid = htons(BSTP_PROTO_ID);
362
363 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
364 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
365
366 switch (bpdu->cbu_bpdutype) {
367 case BSTP_MSGTYPE_CFG:
368 bpdu->cbu_protover = BSTP_PROTO_STP;
369 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_STP_LEN;
370 eh->ether_type = htons(BSTP_BPDU_STP_LEN);
371 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu,
372 BSTP_BPDU_STP_LEN);
373 break;
374
375 case BSTP_MSGTYPE_RSTP:
376 bpdu->cbu_protover = BSTP_PROTO_RSTP;
377 bpdu->cbu_versionlen = htons(0);
378 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_RSTP_LEN;
379 eh->ether_type = htons(BSTP_BPDU_RSTP_LEN);
380 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu,
381 BSTP_BPDU_RSTP_LEN);
382 break;
383
384 default:
385 panic("not implemented");
386 }
387 m->m_pkthdr.rcvif = ifp;
388 m->m_len = m->m_pkthdr.len;
389
390 bp->bp_txcount++;
391 bstp_enqueue(ifp, m);
392}
393
394static void
395bstp_enqueue(struct ifnet *dst_ifp, struct mbuf *m)
396{
397 int err = 0;
398
399 IFQ_ENQUEUE(&dst_ifp->if_snd, m, err);
400
401 if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0)
402 (*dst_ifp->if_start)(dst_ifp);
403}
404
405static int
406bstp_pdu_flags(struct bstp_port *bp)
407{
408 int flags = 0;
409
410 if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING)
411 flags |= BSTP_PDU_F_P;
412
413 if (bp->bp_agree)
414 flags |= BSTP_PDU_F_A;
415
416 if (bp->bp_tc_timer.active)
417 flags |= BSTP_PDU_F_TC;
418
419 if (bp->bp_tc_ack)
420 flags |= BSTP_PDU_F_TCA;
421
422 switch (bp->bp_state) {
423 case BSTP_IFSTATE_LEARNING:
424 flags |= BSTP_PDU_F_L;
425 break;
426
427 case BSTP_IFSTATE_FORWARDING:
428 flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F);
429 break;
430 }
431
432 switch (bp->bp_role) {
433 case BSTP_ROLE_ROOT:
434 flags |=
435 (BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT);
436 break;
437
438 case BSTP_ROLE_ALTERNATE:
439 case BSTP_ROLE_BACKUP: /* fall through */
440 flags |=
441 (BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT);
442 break;
443
444 case BSTP_ROLE_DESIGNATED:
445 flags |=
446 (BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT);
447 break;
448 }
449
450 /* Strip off unused flags in either mode */
451 switch (bp->bp_protover) {
452 case BSTP_PROTO_STP:
453 flags &= BSTP_PDU_STPMASK;
454 break;
455 case BSTP_PROTO_RSTP:
456 flags &= BSTP_PDU_RSTPMASK;
457 break;
458 }
459 return (flags);
460}
461
462struct mbuf *
463bstp_input(struct bstp_port *bp, struct ifnet *ifp, struct mbuf *m)
464{
465 struct bstp_state *bs = bp->bp_bs;
466 struct ether_header *eh;
467 struct bstp_tbpdu tpdu;
468 uint16_t len;
469
470 if (bp->bp_active == 0) {
471 m_freem(m);
472 return (NULL);
473 }
474
475 BSTP_LOCK(bs);
476
477 eh = mtod(m, struct ether_header *);
478
479 len = ntohs(eh->ether_type);
480 if (len < sizeof(tpdu))
481 goto out;
482
483 m_adj(m, ETHER_HDR_LEN);
484
485 if (m->m_pkthdr.len > len)
486 m_adj(m, len - m->m_pkthdr.len);
487 if (m->m_len < sizeof(tpdu) &&
488 (m = m_pullup(m, sizeof(tpdu))) == NULL)
489 goto out;
490
491 memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu));
492
493 /* basic packet checks */
494 if (tpdu.tbu_dsap != LLC_8021D_LSAP ||
495 tpdu.tbu_ssap != LLC_8021D_LSAP ||
496 tpdu.tbu_ctl != LLC_UI)
497 goto out;
498 if (tpdu.tbu_protoid != BSTP_PROTO_ID)
499 goto out;
500
501 /*
502 * We can treat later versions of the PDU as the same as the maximum
503 * version we implement. All additional parameters/flags are ignored.
504 */
505 if (tpdu.tbu_protover > BSTP_PROTO_MAX)
506 tpdu.tbu_protover = BSTP_PROTO_MAX;
507
508 if (tpdu.tbu_protover != bp->bp_protover) {
509 /*
510 * Wait for the migration delay timer to expire before changing
511 * protocol version to avoid flip-flops.
512 */
513 if (bp->bp_flags & BSTP_PORT_CANMIGRATE)
514 bstp_set_port_proto(bp, tpdu.tbu_protover);
515 else
516 goto out;
517 }
518
519 /* Clear operedge upon receiving a PDU on the port */
520 bp->bp_operedge = 0;
521 bstp_timer_start(&bp->bp_edge_delay_timer,
522 BSTP_DEFAULT_MIGRATE_DELAY);
523
524 switch (tpdu.tbu_protover) {
525 case BSTP_PROTO_STP:
526 bstp_received_stp(bs, bp, &m, &tpdu);
527 break;
528
529 case BSTP_PROTO_RSTP:
530 bstp_received_rstp(bs, bp, &m, &tpdu);
531 break;
532 }
533out:
534 BSTP_UNLOCK(bs);
535 if (m)
536 m_freem(m);
537 return (NULL);
538}
539
540static void
541bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp,
542 struct mbuf **mp, struct bstp_tbpdu *tpdu)
543{
544 struct bstp_cbpdu cpdu;
545 struct bstp_config_unit *cu = &bp->bp_msg_cu;
546 struct bstp_tcn_unit tu;
547
548 switch (tpdu->tbu_bpdutype) {
549 case BSTP_MSGTYPE_TCN:
550 tu.tu_message_type = tpdu->tbu_bpdutype;
551 bstp_received_tcn(bs, bp, &tu);
552 break;
553 case BSTP_MSGTYPE_CFG:
554 if ((*mp)->m_len < BSTP_BPDU_STP_LEN &&
555 (*mp = m_pullup(*mp, BSTP_BPDU_STP_LEN)) == NULL)
556 return;
557 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_STP_LEN);
558
559 bstp_decode_bpdu(bp, &cpdu, cu);
560 bstp_received_bpdu(bs, bp, cu);
561 break;
562 }
563}
564
565static void
566bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp,
567 struct mbuf **mp, struct bstp_tbpdu *tpdu)
568{
569 struct bstp_cbpdu cpdu;
570 struct bstp_config_unit *cu = &bp->bp_msg_cu;
571
572 if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP)
573 return;
574
575 if ((*mp)->m_len < BSTP_BPDU_RSTP_LEN &&
576 (*mp = m_pullup(*mp, BSTP_BPDU_RSTP_LEN)) == NULL)
577 return;
578 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_RSTP_LEN);
579
580 bstp_decode_bpdu(bp, &cpdu, cu);
581 bstp_received_bpdu(bs, bp, cu);
582}
583
584static void
585bstp_received_tcn(struct bstp_state *bs, struct bstp_port *bp,
586 struct bstp_tcn_unit *tcn)
587{
588 bp->bp_rcvdtcn = 1;
589 bstp_update_tc(bp);
590}
591
592static void
593bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp,
594 struct bstp_config_unit *cu)
595{
596 int type;
597
598 BSTP_LOCK_ASSERT(bs);
599
600 /* We need to have transitioned to INFO_MINE before proceeding */
601 switch (bp->bp_infois) {
602 case BSTP_INFO_DISABLED:
603 case BSTP_INFO_AGED:
604 return;
605 }
606
607 type = bstp_pdu_rcvtype(bp, cu);
608
609 switch (type) {
610 case BSTP_PDU_SUPERIOR:
611 bs->bs_allsynced = 0;
612 bp->bp_agreed = 0;
613 bp->bp_proposing = 0;
614
615 if (cu->cu_proposal && cu->cu_forwarding == 0)
616 bp->bp_proposed = 1;
617 if (cu->cu_topology_change)
618 bp->bp_rcvdtc = 1;
619 if (cu->cu_topology_change_ack)
620 bp->bp_rcvdtca = 1;
621
622 if (bp->bp_agree &&
623 !bstp_pdu_bettersame(bp, BSTP_INFO_RECEIVED))
624 bp->bp_agree = 0;
625
626 /* copy the received priority and timers to the port */
627 bp->bp_port_pv = cu->cu_pv;
628 bp->bp_port_msg_age = cu->cu_message_age;
629 bp->bp_port_max_age = cu->cu_max_age;
630 bp->bp_port_fdelay = cu->cu_forward_delay;
631 bp->bp_port_htime =
632 (cu->cu_hello_time > BSTP_MIN_HELLO_TIME ?
633 cu->cu_hello_time : BSTP_MIN_HELLO_TIME);
634
635 /* set expiry for the new info */
636 bstp_set_timer_msgage(bp);
637
638 bp->bp_infois = BSTP_INFO_RECEIVED;
639 bstp_assign_roles(bs);
640 break;
641
642 case BSTP_PDU_REPEATED:
643 if (cu->cu_proposal && cu->cu_forwarding == 0)
644 bp->bp_proposed = 1;
645 if (cu->cu_topology_change)
646 bp->bp_rcvdtc = 1;
647 if (cu->cu_topology_change_ack)
648 bp->bp_rcvdtca = 1;
649
650 /* rearm the age timer */
651 bstp_set_timer_msgage(bp);
652 break;
653
654 case BSTP_PDU_INFERIOR:
655 if (cu->cu_learning) {
656 bp->bp_agreed = 1;
657 bp->bp_proposing = 0;
658 }
659 break;
660
661 case BSTP_PDU_INFERIORALT:
662 /*
663 * only point to point links are allowed fast
664 * transitions to forwarding.
665 */
666 if (cu->cu_agree && bp->bp_ptp_link) {
667 bp->bp_agreed = 1;
668 bp->bp_proposing = 0;
669 } else
670 bp->bp_agreed = 0;
671
672 if (cu->cu_topology_change)
673 bp->bp_rcvdtc = 1;
674 if (cu->cu_topology_change_ack)
675 bp->bp_rcvdtca = 1;
676 break;
677
678 case BSTP_PDU_OTHER:
679 return; /* do nothing */
680 }
681 /* update the state machines with the new data */
682 bstp_update_state(bs, bp);
683}
684
685static int
686bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu)
687{
688 int type;
689
690 /* default return type */
691 type = BSTP_PDU_OTHER;
692
693 switch (cu->cu_role) {
694 case BSTP_ROLE_DESIGNATED:
695 if (bstp_info_superior(&bp->bp_port_pv, &cu->cu_pv))
696 /* bpdu priority is superior */
697 type = BSTP_PDU_SUPERIOR;
698 else if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) ==
699 INFO_SAME) {
700 if (bp->bp_port_msg_age != cu->cu_message_age ||
701 bp->bp_port_max_age != cu->cu_max_age ||
702 bp->bp_port_fdelay != cu->cu_forward_delay ||
703 bp->bp_port_htime != cu->cu_hello_time)
704 /* bpdu priority is equal and timers differ */
705 type = BSTP_PDU_SUPERIOR;
706 else
707 /* bpdu is equal */
708 type = BSTP_PDU_REPEATED;
709 } else
710 /* bpdu priority is worse */
711 type = BSTP_PDU_INFERIOR;
712
713 break;
714
715 case BSTP_ROLE_ROOT:
716 case BSTP_ROLE_ALTERNATE:
717 case BSTP_ROLE_BACKUP:
718 if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) <= INFO_SAME)
719 /*
720 * not a designated port and priority is the same or
721 * worse
722 */
723 type = BSTP_PDU_INFERIORALT;
724 break;
725 }
726
727 return (type);
728}
729
730static int
731bstp_pdu_bettersame(struct bstp_port *bp, int newinfo)
732{
733 if (newinfo == BSTP_INFO_RECEIVED &&
734 bp->bp_infois == BSTP_INFO_RECEIVED &&
735 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME)
736 return (1);
737
738 if (newinfo == BSTP_INFO_MINE &&
739 bp->bp_infois == BSTP_INFO_MINE &&
740 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) >= INFO_SAME)
741 return (1);
742
743 return (0);
744}
745
746static int
747bstp_info_cmp(struct bstp_pri_vector *pv,
748 struct bstp_pri_vector *cpv)
749{
750 if (cpv->pv_root_id < pv->pv_root_id)
751 return (INFO_BETTER);
752 if (cpv->pv_root_id > pv->pv_root_id)
753 return (INFO_WORSE);
754
755 if (cpv->pv_cost < pv->pv_cost)
756 return (INFO_BETTER);
757 if (cpv->pv_cost > pv->pv_cost)
758 return (INFO_WORSE);
759
760 if (cpv->pv_dbridge_id < pv->pv_dbridge_id)
761 return (INFO_BETTER);
762 if (cpv->pv_dbridge_id > pv->pv_dbridge_id)
763 return (INFO_WORSE);
764
765 if (cpv->pv_dport_id < pv->pv_dport_id)
766 return (INFO_BETTER);
767 if (cpv->pv_dport_id > pv->pv_dport_id)
768 return (INFO_WORSE);
769
770 return (INFO_SAME);
771}
772
773/*
774 * This message priority vector is superior to the port priority vector and
775 * will replace it if, and only if, the message priority vector is better than
776 * the port priority vector, or the message has been transmitted from the same
777 * designated bridge and designated port as the port priority vector.
778 */
779static int
780bstp_info_superior(struct bstp_pri_vector *pv,
781 struct bstp_pri_vector *cpv)
782{
783 if (bstp_info_cmp(pv, cpv) == INFO_BETTER ||
784 (bstp_same_bridgeid(pv->pv_dbridge_id, cpv->pv_dbridge_id) &&
785 (cpv->pv_dport_id & 0xfff) == (pv->pv_dport_id & 0xfff)))
786 return (1);
787 return (0);
788}
789
790static void
791bstp_assign_roles(struct bstp_state *bs)
792{
793 struct bstp_port *bp, *rbp = NULL;
794 struct bstp_pri_vector pv;
795
796 /* default to our priority vector */
797 bs->bs_root_pv = bs->bs_bridge_pv;
798 bs->bs_root_msg_age = 0;
799 bs->bs_root_max_age = bs->bs_bridge_max_age;
800 bs->bs_root_fdelay = bs->bs_bridge_fdelay;
801 bs->bs_root_htime = bs->bs_bridge_htime;
802 bs->bs_root_port = NULL;
803
804 /* check if any recieved info supersedes us */
805 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
806 if (bp->bp_infois != BSTP_INFO_RECEIVED)
807 continue;
808
809 pv = bp->bp_port_pv;
810 pv.pv_cost += bp->bp_path_cost;
811
812 /*
813 * The root priority vector is the best of the set comprising
814 * the bridge priority vector plus all root path priority
815 * vectors whose bridge address is not equal to us.
816 */
817 if (bstp_same_bridgeid(pv.pv_dbridge_id,
818 bs->bs_bridge_pv.pv_dbridge_id) == 0 &&
819 bstp_info_cmp(&bs->bs_root_pv, &pv) == INFO_BETTER) {
820 /* the port vector replaces the root */
821 bs->bs_root_pv = pv;
822 bs->bs_root_msg_age = bp->bp_port_msg_age +
823 BSTP_MESSAGE_AGE_INCR;
824 bs->bs_root_max_age = bp->bp_port_max_age;
825 bs->bs_root_fdelay = bp->bp_port_fdelay;
826 bs->bs_root_htime = bp->bp_port_htime;
827 rbp = bp;
828 }
829 }
830
831 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
832 /* calculate the port designated vector */
833 bp->bp_desg_pv.pv_root_id = bs->bs_root_pv.pv_root_id;
834 bp->bp_desg_pv.pv_cost = bs->bs_root_pv.pv_cost;
835 bp->bp_desg_pv.pv_dbridge_id = bs->bs_bridge_pv.pv_dbridge_id;
836 bp->bp_desg_pv.pv_dport_id = bp->bp_port_id;
837 bp->bp_desg_pv.pv_port_id = bp->bp_port_id;
838
839 /* calculate designated times */
840 bp->bp_desg_msg_age = bs->bs_root_msg_age;
841 bp->bp_desg_max_age = bs->bs_root_max_age;
842 bp->bp_desg_fdelay = bs->bs_root_fdelay;
843 bp->bp_desg_htime = bs->bs_bridge_htime;
844
845
846 switch (bp->bp_infois) {
847 case BSTP_INFO_DISABLED:
848 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
849 break;
850
851 case BSTP_INFO_AGED:
852 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
853 bstp_update_info(bp);
854 break;
855
856 case BSTP_INFO_MINE:
857 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
858 /* update the port info if stale */
859 if (bstp_info_cmp(&bp->bp_port_pv,
860 &bp->bp_desg_pv) != INFO_SAME ||
861 (rbp != NULL &&
862 (bp->bp_port_msg_age != rbp->bp_port_msg_age ||
863 bp->bp_port_max_age != rbp->bp_port_max_age ||
864 bp->bp_port_fdelay != rbp->bp_port_fdelay ||
865 bp->bp_port_htime != rbp->bp_port_htime)))
866 bstp_update_info(bp);
867 break;
868
869 case BSTP_INFO_RECEIVED:
870 if (bp == rbp) {
871 /*
872 * root priority is derived from this
873 * port, make it the root port.
874 */
875 bstp_set_port_role(bp, BSTP_ROLE_ROOT);
876 bs->bs_root_port = bp;
877 } else if (bstp_info_cmp(&bp->bp_port_pv,
878 &bp->bp_desg_pv) == INFO_BETTER) {
879 /*
880 * the port priority is lower than the root
881 * port.
882 */
883 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
884 bstp_update_info(bp);
885 } else {
886 if (bstp_same_bridgeid(
887 bp->bp_port_pv.pv_dbridge_id,
888 bs->bs_bridge_pv.pv_dbridge_id)) {
889 /*
890 * the designated bridge refers to
891 * another port on this bridge.
892 */
893 bstp_set_port_role(bp,
894 BSTP_ROLE_BACKUP);
895 } else {
896 /*
897 * the port is an inferior path to the
898 * root bridge.
899 */
900 bstp_set_port_role(bp,
901 BSTP_ROLE_ALTERNATE);
902 }
903 }
904 break;
905 }
906 }
907}
908
909static void
910bstp_update_state(struct bstp_state *bs, struct bstp_port *bp)
911{
912 struct bstp_port *bp2;
913 int synced;
914
915 BSTP_LOCK_ASSERT(bs);
916
917 /* check if all the ports have syncronised again */
918 if (!bs->bs_allsynced) {
919 synced = 1;
920 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
921 if (!(bp2->bp_synced ||
922 bp2->bp_role == BSTP_ROLE_ROOT)) {
923 synced = 0;
924 break;
925 }
926 }
927 bs->bs_allsynced = synced;
928 }
929
930 bstp_update_roles(bs, bp);
931 bstp_update_tc(bp);
932}
933
934static void
935bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp)
936{
937 switch (bp->bp_role) {
938 case BSTP_ROLE_DISABLED:
939 /* Clear any flags if set */
940 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) {
941 bp->bp_sync = 0;
942 bp->bp_synced = 1;
943 bp->bp_reroot = 0;
944 }
945 break;
946
947 case BSTP_ROLE_ALTERNATE:
948 case BSTP_ROLE_BACKUP:
949 if ((bs->bs_allsynced && !bp->bp_agree) ||
950 (bp->bp_proposed && bp->bp_agree)) {
951 bp->bp_proposed = 0;
952 bp->bp_agree = 1;
953 bp->bp_flags |= BSTP_PORT_NEWINFO;
954 DPRINTF("%s -> ALTERNATE_AGREED\n",
955 bp->bp_ifp->if_xname);
956 }
957
958 if (bp->bp_proposed && !bp->bp_agree) {
959 bstp_set_all_sync(bs);
960 bp->bp_proposed = 0;
961 DPRINTF("%s -> ALTERNATE_PROPOSED\n",
962 bp->bp_ifp->if_xname);
963 }
964
965 /* Clear any flags if set */
966 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) {
967 bp->bp_sync = 0;
968 bp->bp_synced = 1;
969 bp->bp_reroot = 0;
970 DPRINTF("%s -> ALTERNATE_PORT\n", bp->bp_ifp->if_xname);
971 }
972 break;
973
974 case BSTP_ROLE_ROOT:
975 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) {
976 bstp_set_all_reroot(bs);
977 DPRINTF("%s -> ROOT_REROOT\n", bp->bp_ifp->if_xname);
978 }
979
980 if ((bs->bs_allsynced && !bp->bp_agree) ||
981 (bp->bp_proposed && bp->bp_agree)) {
982 bp->bp_proposed = 0;
983 bp->bp_sync = 0;
984 bp->bp_agree = 1;
985 bp->bp_flags |= BSTP_PORT_NEWINFO;
986 DPRINTF("%s -> ROOT_AGREED\n", bp->bp_ifp->if_xname);
987 }
988
989 if (bp->bp_proposed && !bp->bp_agree) {
990 bstp_set_all_sync(bs);
991 bp->bp_proposed = 0;
992 DPRINTF("%s -> ROOT_PROPOSED\n", bp->bp_ifp->if_xname);
993 }
994
995 if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
996 (bp->bp_forward_delay_timer.active == 0 ||
997 (bstp_rerooted(bs, bp) &&
998 bp->bp_recent_backup_timer.active == 0 &&
999 bp->bp_protover == BSTP_PROTO_RSTP))) {
1000 switch (bp->bp_state) {
1001 case BSTP_IFSTATE_DISCARDING:
1002 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING);
1003 break;
1004 case BSTP_IFSTATE_LEARNING:
1005 bstp_set_port_state(bp,
1006 BSTP_IFSTATE_FORWARDING);
1007 break;
1008 }
1009 }
1010
1011 if (bp->bp_state == BSTP_IFSTATE_FORWARDING && bp->bp_reroot) {
1012 bp->bp_reroot = 0;
1013 DPRINTF("%s -> ROOT_REROOTED\n", bp->bp_ifp->if_xname);
1014 }
1015 break;
1016
1017 case BSTP_ROLE_DESIGNATED:
1018 if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) {
1019 bp->bp_reroot = 0;
1020 DPRINTF("%s -> DESIGNATED_RETIRED\n",
1021 bp->bp_ifp->if_xname);
1022 }
1023
1024 if ((bp->bp_state == BSTP_IFSTATE_DISCARDING &&
1025 !bp->bp_synced) || (bp->bp_agreed && !bp->bp_synced) ||
1026 (bp->bp_operedge && !bp->bp_synced) ||
1027 (bp->bp_sync && bp->bp_synced)) {
1028 bstp_timer_stop(&bp->bp_recent_root_timer);
1029 bp->bp_synced = 1;
1030 bp->bp_sync = 0;
1031 DPRINTF("%s -> DESIGNATED_SYNCED\n",
1032 bp->bp_ifp->if_xname);
1033 }
1034
1035 if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
1036 !bp->bp_agreed && !bp->bp_proposing &&
1037 !bp->bp_operedge) {
1038 bp->bp_proposing = 1;
1039 bp->bp_flags |= BSTP_PORT_NEWINFO;
1040 bstp_timer_start(&bp->bp_edge_delay_timer,
1041 (bp->bp_ptp_link ? BSTP_DEFAULT_MIGRATE_DELAY :
1042 bp->bp_desg_max_age));
1043 DPRINTF("%s -> DESIGNATED_PROPOSE\n",
1044 bp->bp_ifp->if_xname);
1045 }
1046
1047 if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
1048 (bp->bp_forward_delay_timer.active == 0 || bp->bp_agreed ||
1049 bp->bp_operedge) &&
1050 (bp->bp_recent_root_timer.active == 0 || !bp->bp_reroot) &&
1051 !bp->bp_sync) {
1052 if (bp->bp_agreed)
1053 DPRINTF("%s -> AGREED\n", bp->bp_ifp->if_xname);
1054 /*
1055 * If agreed|operedge then go straight to forwarding,
1056 * otherwise follow discard -> learn -> forward.
1057 */
1058 if (bp->bp_agreed || bp->bp_operedge ||
1059 bp->bp_state == BSTP_IFSTATE_LEARNING) {
1060 bstp_set_port_state(bp,
1061 BSTP_IFSTATE_FORWARDING);
1062 bp->bp_agreed = bp->bp_protover;
1063 } else if (bp->bp_state == BSTP_IFSTATE_DISCARDING)
1064 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING);
1065 }
1066
1067 if (((bp->bp_sync && !bp->bp_synced) ||
1068 (bp->bp_reroot && bp->bp_recent_root_timer.active) ||
1069 (bp->bp_flags & BSTP_PORT_DISPUTED)) && !bp->bp_operedge &&
1070 bp->bp_state != BSTP_IFSTATE_DISCARDING) {
1071 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
1072 bp->bp_flags &= ~BSTP_PORT_DISPUTED;
1073 bstp_timer_start(&bp->bp_forward_delay_timer,
1074 bp->bp_protover == BSTP_PROTO_RSTP ?
1075 bp->bp_desg_htime : bp->bp_desg_fdelay);
1076 DPRINTF("%s -> DESIGNATED_DISCARD\n",
1077 bp->bp_ifp->if_xname);
1078 }
1079 break;
1080 }
1081
1082 if (bp->bp_flags & BSTP_PORT_NEWINFO)
1083 bstp_transmit(bs, bp);
1084}
1085
1086static void
1087bstp_update_tc(struct bstp_port *bp)
1088{
1089 switch (bp->bp_tcstate) {
1090 case BSTP_TCSTATE_ACTIVE:
1091 if ((bp->bp_role != BSTP_ROLE_DESIGNATED &&
1092 bp->bp_role != BSTP_ROLE_ROOT) || bp->bp_operedge)
1093 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
1094
1095 if (bp->bp_rcvdtcn)
1096 bstp_set_port_tc(bp, BSTP_TCSTATE_TCN);
1097 if (bp->bp_rcvdtc)
1098 bstp_set_port_tc(bp, BSTP_TCSTATE_TC);
1099
1100 if (bp->bp_tc_prop && !bp->bp_operedge)
1101 bstp_set_port_tc(bp, BSTP_TCSTATE_PROPAG);
1102
1103 if (bp->bp_rcvdtca)
1104 bstp_set_port_tc(bp, BSTP_TCSTATE_ACK);
1105 break;
1106
1107 case BSTP_TCSTATE_INACTIVE:
1108 if ((bp->bp_state == BSTP_IFSTATE_LEARNING ||
1109 bp->bp_state == BSTP_IFSTATE_FORWARDING) &&
1110 bp->bp_fdbflush == 0)
1111 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
1112 break;
1113
1114 case BSTP_TCSTATE_LEARNING:
1115 if (bp->bp_rcvdtc || bp->bp_rcvdtcn || bp->bp_rcvdtca ||
1116 bp->bp_tc_prop)
1117 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
1118 else if (bp->bp_role != BSTP_ROLE_DESIGNATED &&
1119 bp->bp_role != BSTP_ROLE_ROOT &&
1120 bp->bp_state == BSTP_IFSTATE_DISCARDING)
1121 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
1122
1123 if ((bp->bp_role == BSTP_ROLE_DESIGNATED ||
1124 bp->bp_role == BSTP_ROLE_ROOT) &&
1125 bp->bp_state == BSTP_IFSTATE_FORWARDING &&
1126 !bp->bp_operedge)
1127 bstp_set_port_tc(bp, BSTP_TCSTATE_DETECTED);
1128 break;
1129
1130 /* these are transient states and go straight back to ACTIVE */
1131 case BSTP_TCSTATE_DETECTED:
1132 case BSTP_TCSTATE_TCN:
1133 case BSTP_TCSTATE_TC:
1134 case BSTP_TCSTATE_PROPAG:
1135 case BSTP_TCSTATE_ACK:
1136 DPRINTF("Invalid TC state for %s\n",
1137 bp->bp_ifp->if_xname);
1138 break;
1139 }
1140
1141}
1142
1143static void
1144bstp_update_info(struct bstp_port *bp)
1145{
1146 struct bstp_state *bs = bp->bp_bs;
1147
1148 bp->bp_proposing = 0;
1149 bp->bp_proposed = 0;
1150
1151 if (bp->bp_agreed && !bstp_pdu_bettersame(bp, BSTP_INFO_MINE))
1152 bp->bp_agreed = 0;
1153
1154 if (bp->bp_synced && !bp->bp_agreed) {
1155 bp->bp_synced = 0;
1156 bs->bs_allsynced = 0;
1157 }
1158
1159 /* copy the designated pv to the port */
1160 bp->bp_port_pv = bp->bp_desg_pv;
1161 bp->bp_port_msg_age = bp->bp_desg_msg_age;
1162 bp->bp_port_max_age = bp->bp_desg_max_age;
1163 bp->bp_port_fdelay = bp->bp_desg_fdelay;
1164 bp->bp_port_htime = bp->bp_desg_htime;
1165 bp->bp_infois = BSTP_INFO_MINE;
1166
1167 /* Set transmit flag but do not immediately send */
1168 bp->bp_flags |= BSTP_PORT_NEWINFO;
1169}
1170
1171/* set tcprop on every port other than the caller */
1172static void
1173bstp_set_other_tcprop(struct bstp_port *bp)
1174{
1175 struct bstp_state *bs = bp->bp_bs;
1176 struct bstp_port *bp2;
1177
1178 BSTP_LOCK_ASSERT(bs);
1179
1180 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
1181 if (bp2 == bp)
1182 continue;
1183 bp2->bp_tc_prop = 1;
1184 }
1185}
1186
1187static void
1188bstp_set_all_reroot(struct bstp_state *bs)
1189{
1190 struct bstp_port *bp;
1191
1192 BSTP_LOCK_ASSERT(bs);
1193
1194 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
1195 bp->bp_reroot = 1;
1196}
1197
1198static void
1199bstp_set_all_sync(struct bstp_state *bs)
1200{
1201 struct bstp_port *bp;
1202
1203 BSTP_LOCK_ASSERT(bs);
1204
1205 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1206 bp->bp_sync = 1;
1207 bp->bp_synced = 0; /* Not explicit in spec */
1208 }
1209
1210 bs->bs_allsynced = 0;
1211}
1212
1213static void
1214bstp_set_port_state(struct bstp_port *bp, int state)
1215{
1216 if (bp->bp_state == state)
1217 return;
1218
1219 bp->bp_state = state;
1220
1221 switch (bp->bp_state) {
1222 case BSTP_IFSTATE_DISCARDING:
1223 DPRINTF("state changed to DISCARDING on %s\n",
1224 bp->bp_ifp->if_xname);
1225 break;
1226
1227 case BSTP_IFSTATE_LEARNING:
1228 DPRINTF("state changed to LEARNING on %s\n",
1229 bp->bp_ifp->if_xname);
1230
1231 bstp_timer_start(&bp->bp_forward_delay_timer,
1232 bp->bp_protover == BSTP_PROTO_RSTP ?
1233 bp->bp_desg_htime : bp->bp_desg_fdelay);
1234 break;
1235
1236 case BSTP_IFSTATE_FORWARDING:
1237 DPRINTF("state changed to FORWARDING on %s\n",
1238 bp->bp_ifp->if_xname);
1239
1240 bstp_timer_stop(&bp->bp_forward_delay_timer);
1241 /* Record that we enabled forwarding */
1242 bp->bp_forward_transitions++;
1243 break;
1244 }
1245
1246 /* notify the parent bridge */
1247 taskqueue_enqueue(taskqueue_swi, &bp->bp_statetask);
1248}
1249
1250static void
1251bstp_set_port_role(struct bstp_port *bp, int role)
1252{
1253 struct bstp_state *bs = bp->bp_bs;
1254
1255 if (bp->bp_role == role)
1256 return;
1257
1258 /* perform pre-change tasks */
1259 switch (bp->bp_role) {
1260 case BSTP_ROLE_DISABLED:
1261 bstp_timer_start(&bp->bp_forward_delay_timer,
1262 bp->bp_desg_max_age);
1263 break;
1264
1265 case BSTP_ROLE_BACKUP:
1266 bstp_timer_start(&bp->bp_recent_backup_timer,
1267 bp->bp_desg_htime * 2);
1268 /* fall through */
1269 case BSTP_ROLE_ALTERNATE:
1270 bstp_timer_start(&bp->bp_forward_delay_timer,
1271 bp->bp_desg_fdelay);
1272 bp->bp_sync = 0;
1273 bp->bp_synced = 1;
1274 bp->bp_reroot = 0;
1275 break;
1276
1277 case BSTP_ROLE_ROOT:
1278 bstp_timer_start(&bp->bp_recent_root_timer,
1279 BSTP_DEFAULT_FORWARD_DELAY);
1280 break;
1281 }
1282
1283 bp->bp_role = role;
1284 /* clear values not carried between roles */
1285 bp->bp_proposing = 0;
1286 bs->bs_allsynced = 0;
1287
1288 /* initialise the new role */
1289 switch (bp->bp_role) {
1290 case BSTP_ROLE_DISABLED:
1291 case BSTP_ROLE_ALTERNATE:
1292 case BSTP_ROLE_BACKUP:
1293 DPRINTF("%s role -> ALT/BACK/DISABLED\n",
1294 bp->bp_ifp->if_xname);
1295 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
1296 bstp_timer_stop(&bp->bp_recent_root_timer);
1297 bstp_timer_latch(&bp->bp_forward_delay_timer);
1298 bp->bp_sync = 0;
1299 bp->bp_synced = 1;
1300 bp->bp_reroot = 0;
1301 break;
1302
1303 case BSTP_ROLE_ROOT:
1304 DPRINTF("%s role -> ROOT\n",
1305 bp->bp_ifp->if_xname);
1306 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
1307 bstp_timer_latch(&bp->bp_recent_root_timer);
1308 bp->bp_proposing = 0;
1309 break;
1310
1311 case BSTP_ROLE_DESIGNATED:
1312 DPRINTF("%s role -> DESIGNATED\n",
1313 bp->bp_ifp->if_xname);
1314 bstp_timer_start(&bp->bp_hello_timer,
1315 bp->bp_desg_htime);
1316 bp->bp_agree = 0;
1317 break;
1318 }
1319
1320 /* let the TC state know that the role changed */
1321 bstp_update_tc(bp);
1322}
1323
1324static void
1325bstp_set_port_proto(struct bstp_port *bp, int proto)
1326{
1327 struct bstp_state *bs = bp->bp_bs;
1328
1329 /* supported protocol versions */
1330 switch (proto) {
1331 case BSTP_PROTO_STP:
1332 /* we can downgrade protocols only */
1333 bstp_timer_stop(&bp->bp_migrate_delay_timer);
1334 /* clear unsupported features */
1335 bp->bp_operedge = 0;
1336 /* STP compat mode only uses 16 bits of the 32 */
1337 if (bp->bp_path_cost > 65535)
1338 bp->bp_path_cost = 65535;
1339 break;
1340
1341 case BSTP_PROTO_RSTP:
1342 bstp_timer_start(&bp->bp_migrate_delay_timer,
1343 bs->bs_migration_delay);
1344 break;
1345
1346 default:
1347 DPRINTF("Unsupported STP version %d\n", proto);
1348 return;
1349 }
1350
1351 bp->bp_protover = proto;
1352 bp->bp_flags &= ~BSTP_PORT_CANMIGRATE;
1353}
1354
1355static void
1356bstp_set_port_tc(struct bstp_port *bp, int state)
1357{
1358 struct bstp_state *bs = bp->bp_bs;
1359
1360 bp->bp_tcstate = state;
1361
1362 /* initialise the new state */
1363 switch (bp->bp_tcstate) {
1364 case BSTP_TCSTATE_ACTIVE:
1365 DPRINTF("%s -> TC_ACTIVE\n", bp->bp_ifp->if_xname);
1366 /* nothing to do */
1367 break;
1368
1369 case BSTP_TCSTATE_INACTIVE:
1370 bstp_timer_stop(&bp->bp_tc_timer);
1371 /* flush routes on the parent bridge */
1372 bp->bp_fdbflush = 1;
1373 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask);
1374 bp->bp_tc_ack = 0;
1375 DPRINTF("%s -> TC_INACTIVE\n", bp->bp_ifp->if_xname);
1376 break;
1377
1378 case BSTP_TCSTATE_LEARNING:
1379 bp->bp_rcvdtc = 0;
1380 bp->bp_rcvdtcn = 0;
1381 bp->bp_rcvdtca = 0;
1382 bp->bp_tc_prop = 0;
1383 DPRINTF("%s -> TC_LEARNING\n", bp->bp_ifp->if_xname);
1384 break;
1385
1386 case BSTP_TCSTATE_DETECTED:
1387 bstp_set_timer_tc(bp);
1388 bstp_set_other_tcprop(bp);
1389 /* send out notification */
1390 bp->bp_flags |= BSTP_PORT_NEWINFO;
1391 bstp_transmit(bs, bp);
1392 getmicrotime(&bs->bs_last_tc_time);
1393 DPRINTF("%s -> TC_DETECTED\n", bp->bp_ifp->if_xname);
1394 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1395 break;
1396
1397 case BSTP_TCSTATE_TCN:
1398 bstp_set_timer_tc(bp);
1399 DPRINTF("%s -> TC_TCN\n", bp->bp_ifp->if_xname);
1400 /* fall through */
1401 case BSTP_TCSTATE_TC:
1402 bp->bp_rcvdtc = 0;
1403 bp->bp_rcvdtcn = 0;
1404 if (bp->bp_role == BSTP_ROLE_DESIGNATED)
1405 bp->bp_tc_ack = 1;
1406
1407 bstp_set_other_tcprop(bp);
1408 DPRINTF("%s -> TC_TC\n", bp->bp_ifp->if_xname);
1409 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1410 break;
1411
1412 case BSTP_TCSTATE_PROPAG:
1413 /* flush routes on the parent bridge */
1414 bp->bp_fdbflush = 1;
1415 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask);
1416 bp->bp_tc_prop = 0;
1417 bstp_set_timer_tc(bp);
1418 DPRINTF("%s -> TC_PROPAG\n", bp->bp_ifp->if_xname);
1419 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1420 break;
1421
1422 case BSTP_TCSTATE_ACK:
1423 bstp_timer_stop(&bp->bp_tc_timer);
1424 bp->bp_rcvdtca = 0;
1425 DPRINTF("%s -> TC_ACK\n", bp->bp_ifp->if_xname);
1426 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1427 break;
1428 }
1429}
1430
1431static void
1432bstp_set_timer_tc(struct bstp_port *bp)
1433{
1434 struct bstp_state *bs = bp->bp_bs;
1435
1436 if (bp->bp_tc_timer.active)
1437 return;
1438
1439 switch (bp->bp_protover) {
1440 case BSTP_PROTO_RSTP:
1441 bstp_timer_start(&bp->bp_tc_timer,
1442 bp->bp_desg_htime + BSTP_TICK_VAL);
1443 bp->bp_flags |= BSTP_PORT_NEWINFO;
1444 break;
1445
1446 case BSTP_PROTO_STP:
1447 bstp_timer_start(&bp->bp_tc_timer,
1448 bs->bs_root_max_age + bs->bs_root_fdelay);
1449 break;
1450 }
1451}
1452
1453static void
1454bstp_set_timer_msgage(struct bstp_port *bp)
1455{
1456 if (bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR <=
1457 bp->bp_port_max_age) {
1458 bstp_timer_start(&bp->bp_message_age_timer,
1459 bp->bp_port_htime * 3);
1460 } else
1461 /* expires immediately */
1462 bstp_timer_start(&bp->bp_message_age_timer, 0);
1463}
1464
1465static int
1466bstp_rerooted(struct bstp_state *bs, struct bstp_port *bp)
1467{
1468 struct bstp_port *bp2;
1469 int rr_set = 0;
1470
1471 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
1472 if (bp2 == bp)
1473 continue;
1474 if (bp2->bp_recent_root_timer.active) {
1475 rr_set = 1;
1476 break;
1477 }
1478 }
1479 return (!rr_set);
1480}
1481
1482int
1483bstp_set_htime(struct bstp_state *bs, int t)
1484{
1485 /* convert seconds to ticks */
1486 t *= BSTP_TICK_VAL;
1487
1488 /* value can only be changed in leagacy stp mode */
1489 if (bs->bs_protover != BSTP_PROTO_STP)
1490 return (EPERM);
1491
1492 if (t < BSTP_MIN_HELLO_TIME || t > BSTP_MAX_HELLO_TIME)
1493 return (EINVAL);
1494
1495 BSTP_LOCK(bs);
1496 bs->bs_bridge_htime = t;
1497 bstp_reinit(bs);
1498 BSTP_UNLOCK(bs);
1499 return (0);
1500}
1501
1502int
1503bstp_set_fdelay(struct bstp_state *bs, int t)
1504{
1505 /* convert seconds to ticks */
1506 t *= BSTP_TICK_VAL;
1507
1508 if (t < BSTP_MIN_FORWARD_DELAY || t > BSTP_MAX_FORWARD_DELAY)
1509 return (EINVAL);
1510
1511 BSTP_LOCK(bs);
1512 bs->bs_bridge_fdelay = t;
1513 bstp_reinit(bs);
1514 BSTP_UNLOCK(bs);
1515 return (0);
1516}
1517
1518int
1519bstp_set_maxage(struct bstp_state *bs, int t)
1520{
1521 /* convert seconds to ticks */
1522 t *= BSTP_TICK_VAL;
1523
1524 if (t < BSTP_MIN_MAX_AGE || t > BSTP_MAX_MAX_AGE)
1525 return (EINVAL);
1526
1527 BSTP_LOCK(bs);
1528 bs->bs_bridge_max_age = t;
1529 bstp_reinit(bs);
1530 BSTP_UNLOCK(bs);
1531 return (0);
1532}
1533
1534int
1535bstp_set_holdcount(struct bstp_state *bs, int count)
1536{
1537 struct bstp_port *bp;
1538
1539 if (count < BSTP_MIN_HOLD_COUNT ||
1540 count > BSTP_MAX_HOLD_COUNT)
1541 return (EINVAL);
1542
1543 BSTP_LOCK(bs);
1544 bs->bs_txholdcount = count;
1545 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
1546 bp->bp_txcount = 0;
1547 BSTP_UNLOCK(bs);
1548 return (0);
1549}
1550
1551int
1552bstp_set_protocol(struct bstp_state *bs, int proto)
1553{
1554 struct bstp_port *bp;
1555
1556 switch (proto) {
1557 /* Supported protocol versions */
1558 case BSTP_PROTO_STP:
1559 case BSTP_PROTO_RSTP:
1560 break;
1561
1562 default:
1563 return (EINVAL);
1564 }
1565
1566 BSTP_LOCK(bs);
1567 bs->bs_protover = proto;
1568 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME;
1569 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1570 /* reinit state */
1571 bp->bp_infois = BSTP_INFO_DISABLED;
1572 bp->bp_txcount = 0;
1573 bstp_set_port_proto(bp, bs->bs_protover);
1574 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
1575 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
1576 bstp_timer_stop(&bp->bp_recent_backup_timer);
1577 }
1578 bstp_reinit(bs);
1579 BSTP_UNLOCK(bs);
1580 return (0);
1581}
1582
1583int
1584bstp_set_priority(struct bstp_state *bs, int pri)
1585{
1586 if (pri < 0 || pri > BSTP_MAX_PRIORITY)
1587 return (EINVAL);
1588
1589 /* Limit to steps of 4096 */
1590 pri -= pri % 4096;
1591
1592 BSTP_LOCK(bs);
1593 bs->bs_bridge_priority = pri;
1594 bstp_reinit(bs);
1595 BSTP_UNLOCK(bs);
1596 return (0);
1597}
1598
1599int
1600bstp_set_port_priority(struct bstp_port *bp, int pri)
1601{
1602 struct bstp_state *bs = bp->bp_bs;
1603
1604 if (pri < 0 || pri > BSTP_MAX_PORT_PRIORITY)
1605 return (EINVAL);
1606
1607 /* Limit to steps of 16 */
1608 pri -= pri % 16;
1609
1610 BSTP_LOCK(bs);
1611 bp->bp_priority = pri;
1612 bstp_reinit(bs);
1613 BSTP_UNLOCK(bs);
1614 return (0);
1615}
1616
1617int
1618bstp_set_path_cost(struct bstp_port *bp, uint32_t path_cost)
1619{
1620 struct bstp_state *bs = bp->bp_bs;
1621
1622 if (path_cost > BSTP_MAX_PATH_COST)
1623 return (EINVAL);
1624
1625 /* STP compat mode only uses 16 bits of the 32 */
1626 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535)
1627 path_cost = 65535;
1628
1629 BSTP_LOCK(bs);
1630
1631 if (path_cost == 0) { /* use auto */
1632 bp->bp_flags &= ~BSTP_PORT_ADMCOST;
1633 bp->bp_path_cost = bstp_calc_path_cost(bp);
1634 } else {
1635 bp->bp_path_cost = path_cost;
1636 bp->bp_flags |= BSTP_PORT_ADMCOST;
1637 }
1638 bstp_reinit(bs);
1639 BSTP_UNLOCK(bs);
1640 return (0);
1641}
1642
1643int
1644bstp_set_edge(struct bstp_port *bp, int set)
1645{
1646 struct bstp_state *bs = bp->bp_bs;
1647
1648 BSTP_LOCK(bs);
1649 if ((bp->bp_operedge = set) == 0)
1650 bp->bp_flags &= ~BSTP_PORT_ADMEDGE;
1651 else
1652 bp->bp_flags |= BSTP_PORT_ADMEDGE;
1653 BSTP_UNLOCK(bs);
1654 return (0);
1655}
1656
1657int
1658bstp_set_autoedge(struct bstp_port *bp, int set)
1659{
1660 struct bstp_state *bs = bp->bp_bs;
1661
1662 BSTP_LOCK(bs);
1663 if (set) {
1664 bp->bp_flags |= BSTP_PORT_AUTOEDGE;
1665 /* we may be able to transition straight to edge */
1666 if (bp->bp_edge_delay_timer.active == 0)
1667 bstp_edge_delay_expiry(bs, bp);
1668 } else
1669 bp->bp_flags &= ~BSTP_PORT_AUTOEDGE;
1670 BSTP_UNLOCK(bs);
1671 return (0);
1672}
1673
1674int
1675bstp_set_ptp(struct bstp_port *bp, int set)
1676{
1677 struct bstp_state *bs = bp->bp_bs;
1678
1679 BSTP_LOCK(bs);
1680 bp->bp_ptp_link = set;
1681 BSTP_UNLOCK(bs);
1682 return (0);
1683}
1684
1685int
1686bstp_set_autoptp(struct bstp_port *bp, int set)
1687{
1688 struct bstp_state *bs = bp->bp_bs;
1689
1690 BSTP_LOCK(bs);
1691 if (set) {
1692 bp->bp_flags |= BSTP_PORT_AUTOPTP;
1693 if (bp->bp_role != BSTP_ROLE_DISABLED)
1694 bstp_ifupdstatus(bs, bp);
1695 } else
1696 bp->bp_flags &= ~BSTP_PORT_AUTOPTP;
1697 BSTP_UNLOCK(bs);
1698 return (0);
1699}
1700
1701/*
1702 * Calculate the path cost according to the link speed.
1703 */
1704static uint32_t
1705bstp_calc_path_cost(struct bstp_port *bp)
1706{
1707 struct ifnet *ifp = bp->bp_ifp;
1708 uint32_t path_cost;
1709
1710 /* If the priority has been manually set then retain the value */
1711 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1712 return bp->bp_path_cost;
1713
1714 if (ifp->if_link_state == LINK_STATE_DOWN) {
1715 /* Recalc when the link comes up again */
1716 bp->bp_flags |= BSTP_PORT_PNDCOST;
1717 return (BSTP_DEFAULT_PATH_COST);
1718 }
1719
1720 if (ifp->if_baudrate < 1000)
1721 return (BSTP_DEFAULT_PATH_COST);
1722
1723 /* formula from section 17.14, IEEE Std 802.1D-2004 */
1724 path_cost = 20000000000ULL / (ifp->if_baudrate / 1000);
1725
1726 if (path_cost > BSTP_MAX_PATH_COST)
1727 path_cost = BSTP_MAX_PATH_COST;
1728
1729 /* STP compat mode only uses 16 bits of the 32 */
1730 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535)
1731 path_cost = 65535;
1732
1733 return (path_cost);
1734}
1735
1736/*
1737 * Notify the bridge that a port state has changed, we need to do this from a
1738 * taskqueue to avoid a LOR.
1739 */
1740static void
1741bstp_notify_state(void *arg, int pending)
1742{
1743 struct bstp_port *bp = (struct bstp_port *)arg;
1744 struct bstp_state *bs = bp->bp_bs;
1745
1746 if (bp->bp_active == 1 && bs->bs_state_cb != NULL)
1747 (*bs->bs_state_cb)(bp->bp_ifp, bp->bp_state);
1748}
1749
1750/*
1751 * Flush the routes on the bridge port, we need to do this from a
1752 * taskqueue to avoid a LOR.
1753 */
1754static void
1755bstp_notify_rtage(void *arg, int pending)
1756{
1757 struct bstp_port *bp = (struct bstp_port *)arg;
1758 struct bstp_state *bs = bp->bp_bs;
1759 int age = 0;
1760
1761 BSTP_LOCK(bs);
1762 switch (bp->bp_protover) {
1763 case BSTP_PROTO_STP:
1764 /* convert to seconds */
1765 age = bp->bp_desg_fdelay / BSTP_TICK_VAL;
1766 break;
1767
1768 case BSTP_PROTO_RSTP:
1769 age = 0;
1770 break;
1771 }
1772 BSTP_UNLOCK(bs);
1773
1774 if (bp->bp_active == 1 && bs->bs_rtage_cb != NULL)
1775 (*bs->bs_rtage_cb)(bp->bp_ifp, age);
1776
1777 /* flush is complete */
1778 BSTP_LOCK(bs);
1779 bp->bp_fdbflush = 0;
1780 BSTP_UNLOCK(bs);
1781}
1782
1783void
1784bstp_linkstate(struct ifnet *ifp, int state)
1785{
1786 struct bstp_state *bs;
1787 struct bstp_port *bp;
1788
1789 /* search for the stp port */
1790 mtx_lock(&bstp_list_mtx);
1791 LIST_FOREACH(bs, &bstp_list, bs_list) {
1792 BSTP_LOCK(bs);
1793 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1794 if (bp->bp_ifp == ifp) {
1795 bstp_ifupdstatus(bs, bp);
1796 bstp_update_state(bs, bp);
1797 /* it only exists once so return */
1798 BSTP_UNLOCK(bs);
1799 mtx_unlock(&bstp_list_mtx);
1800 return;
1801 }
1802 }
1803 BSTP_UNLOCK(bs);
1804 }
1805 mtx_unlock(&bstp_list_mtx);
1806}
1807
1808static void
1809bstp_ifupdstatus(struct bstp_state *bs, struct bstp_port *bp)
1810{
1811 struct ifnet *ifp = bp->bp_ifp;
1812 struct ifmediareq ifmr;
1813 int error = 0;
1814
1815 BSTP_LOCK_ASSERT(bs);
1816
1817 bzero((char *)&ifmr, sizeof(ifmr));
1818 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
1819
1820 if ((error == 0) && (ifp->if_flags & IFF_UP)) {
1821 if (ifmr.ifm_status & IFM_ACTIVE) {
1822 /* A full-duplex link is assumed to be point to point */
1823 if (bp->bp_flags & BSTP_PORT_AUTOPTP) {
1824 bp->bp_ptp_link =
1825 ifmr.ifm_active & IFM_FDX ? 1 : 0;
1826 }
1827
1828 /* Calc the cost if the link was down previously */
1829 if (bp->bp_flags & BSTP_PORT_PNDCOST) {
1830 bp->bp_path_cost = bstp_calc_path_cost(bp);
1831 bp->bp_flags &= ~BSTP_PORT_PNDCOST;
1832 }
1833
1834 if (bp->bp_role == BSTP_ROLE_DISABLED)
1835 bstp_enable_port(bs, bp);
1836 } else {
1837 if (bp->bp_role != BSTP_ROLE_DISABLED) {
1838 bstp_disable_port(bs, bp);
1839 if ((bp->bp_flags & BSTP_PORT_ADMEDGE) &&
1840 bp->bp_protover == BSTP_PROTO_RSTP)
1841 bp->bp_operedge = 1;
1842 }
1843 }
1844 return;
1845 }
1846
1847 if (bp->bp_infois != BSTP_INFO_DISABLED)
1848 bstp_disable_port(bs, bp);
1849}
1850
1851static void
1852bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp)
1853{
1854 bp->bp_infois = BSTP_INFO_AGED;
1855 bstp_assign_roles(bs);
1856}
1857
1858static void
1859bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp)
1860{
1861 bp->bp_infois = BSTP_INFO_DISABLED;
1862 bstp_assign_roles(bs);
1863}
1864
1865static void
1866bstp_tick(void *arg)
1867{
1868 struct bstp_state *bs = arg;
1869 struct bstp_port *bp;
1870
1871 BSTP_LOCK_ASSERT(bs);
1872
1873 if (bs->bs_running == 0)
1874 return;
1875
1876 /* slow timer to catch missed link events */
1877 if (bstp_timer_expired(&bs->bs_link_timer)) {
1878 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
1879 bstp_ifupdstatus(bs, bp);
1880 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER);
1881 }
1882
1883 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1884 /* no events need to happen for these */
1885 bstp_timer_expired(&bp->bp_tc_timer);
1886 bstp_timer_expired(&bp->bp_recent_root_timer);
1887 bstp_timer_expired(&bp->bp_forward_delay_timer);
1888 bstp_timer_expired(&bp->bp_recent_backup_timer);
1889
1890 if (bstp_timer_expired(&bp->bp_hello_timer))
1891 bstp_hello_timer_expiry(bs, bp);
1892
1893 if (bstp_timer_expired(&bp->bp_message_age_timer))
1894 bstp_message_age_expiry(bs, bp);
1895
1896 if (bstp_timer_expired(&bp->bp_migrate_delay_timer))
1897 bstp_migrate_delay_expiry(bs, bp);
1898
1899 if (bstp_timer_expired(&bp->bp_edge_delay_timer))
1900 bstp_edge_delay_expiry(bs, bp);
1901
1902 /* update the various state machines for the port */
1903 bstp_update_state(bs, bp);
1904
1905 if (bp->bp_txcount > 0)
1906 bp->bp_txcount--;
1907 }
1908
1909 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs);
1910}
1911
1912static void
1913bstp_timer_start(struct bstp_timer *t, uint16_t v)
1914{
1915 t->value = v;
1916 t->active = 1;
1917 t->latched = 0;
1918}
1919
1920static void
1921bstp_timer_stop(struct bstp_timer *t)
1922{
1923 t->value = 0;
1924 t->active = 0;
1925 t->latched = 0;
1926}
1927
1928static void
1929bstp_timer_latch(struct bstp_timer *t)
1930{
1931 t->latched = 1;
1932 t->active = 1;
1933}
1934
1935static int
1936bstp_timer_expired(struct bstp_timer *t)
1937{
1938 if (t->active == 0 || t->latched)
1939 return (0);
1940 t->value -= BSTP_TICK_VAL;
1941 if (t->value <= 0) {
1942 bstp_timer_stop(t);
1943 return (1);
1944 }
1945 return (0);
1946}
1947
1948static void
1949bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp)
1950{
1951 if ((bp->bp_flags & BSTP_PORT_NEWINFO) ||
1952 bp->bp_role == BSTP_ROLE_DESIGNATED ||
1953 (bp->bp_role == BSTP_ROLE_ROOT &&
1954 bp->bp_tc_timer.active == 1)) {
1955 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime);
1956 bp->bp_flags |= BSTP_PORT_NEWINFO;
1957 bstp_transmit(bs, bp);
1958 }
1959}
1960
1961static void
1962bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp)
1963{
1964 if (bp->bp_infois == BSTP_INFO_RECEIVED) {
1965 bp->bp_infois = BSTP_INFO_AGED;
1966 bstp_assign_roles(bs);
1967 DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname);
1968 }
1969}
1970
1971static void
1972bstp_migrate_delay_expiry(struct bstp_state *bs, struct bstp_port *bp)
1973{
1974 bp->bp_flags |= BSTP_PORT_CANMIGRATE;
1975}
1976
1977static void
1978bstp_edge_delay_expiry(struct bstp_state *bs, struct bstp_port *bp)
1979{
1980 if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) &&
1981 bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing &&
1982 bp->bp_role == BSTP_ROLE_DESIGNATED) {
1983 bp->bp_operedge = 1;
1984 DPRINTF("%s -> edge port\n", bp->bp_ifp->if_xname);
1985 }
1986}
1987
1988static int
1989bstp_addr_cmp(const uint8_t *a, const uint8_t *b)
1990{
1991 int i, d;
1992
1993 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
1994 d = ((int)a[i]) - ((int)b[i]);
1995 }
1996
1997 return (d);
1998}
1999
2000/*
2001 * compare the bridge address component of the bridgeid
2002 */
2003static int
2004bstp_same_bridgeid(uint64_t id1, uint64_t id2)
2005{
2006 u_char addr1[ETHER_ADDR_LEN];
2007 u_char addr2[ETHER_ADDR_LEN];
2008
2009 PV2ADDR(id1, addr1);
2010 PV2ADDR(id2, addr2);
2011
2012 if (bstp_addr_cmp(addr1, addr2) == 0)
2013 return (1);
2014
2015 return (0);
2016}
2017
2018void
2019bstp_reinit(struct bstp_state *bs)
2020{
2021 INIT_VNET_NET(curvnet);
2022 struct bstp_port *bp;
2023 struct ifnet *ifp, *mif;
2024 u_char *e_addr;
2025 static const u_char llzero[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
2026
2027 BSTP_LOCK_ASSERT(bs);
2028
2029 mif = NULL;
2030 /*
2031 * Search through the Ethernet adapters and find the one with the
2032 * lowest value. The adapter which we take the MAC address from does
2033 * not need to be part of the bridge, it just needs to be a unique
2034 * value.
2035 */
2036 IFNET_RLOCK();
2037 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2038 if (ifp->if_type != IFT_ETHER)
2039 continue;
2040
2041 if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0)
2042 continue;
2043
2044 if (mif == NULL) {
2045 mif = ifp;
2046 continue;
2047 }
2048 if (bstp_addr_cmp(IF_LLADDR(ifp), IF_LLADDR(mif)) < 0) {
2049 mif = ifp;
2050 continue;
2051 }
2052 }
2053 IFNET_RUNLOCK();
2054
2055 if (LIST_EMPTY(&bs->bs_bplist) || mif == NULL) {
2056 /* Set the bridge and root id (lower bits) to zero */
2057 bs->bs_bridge_pv.pv_dbridge_id =
2058 ((uint64_t)bs->bs_bridge_priority) << 48;
2059 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id;
2060 bs->bs_root_pv = bs->bs_bridge_pv;
2061 /* Disable any remaining ports, they will have no MAC address */
2062 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
2063 bp->bp_infois = BSTP_INFO_DISABLED;
2064 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
2065 }
2066 callout_stop(&bs->bs_bstpcallout);
2067 return;
2068 }
2069
2070 e_addr = IF_LLADDR(mif);
2071 bs->bs_bridge_pv.pv_dbridge_id =
2072 (((uint64_t)bs->bs_bridge_priority) << 48) |
2073 (((uint64_t)e_addr[0]) << 40) |
2074 (((uint64_t)e_addr[1]) << 32) |
2075 (((uint64_t)e_addr[2]) << 24) |
2076 (((uint64_t)e_addr[3]) << 16) |
2077 (((uint64_t)e_addr[4]) << 8) |
2078 (((uint64_t)e_addr[5]));
2079
2080 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id;
2081 bs->bs_bridge_pv.pv_cost = 0;
2082 bs->bs_bridge_pv.pv_dport_id = 0;
2083 bs->bs_bridge_pv.pv_port_id = 0;
2084
2085 if (bs->bs_running && callout_pending(&bs->bs_bstpcallout) == 0)
2086 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs);
2087
2088 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
2089 bp->bp_port_id = (bp->bp_priority << 8) |
2090 (bp->bp_ifp->if_index & 0xfff);
2091 bstp_ifupdstatus(bs, bp);
2092 }
2093
2094 bstp_assign_roles(bs);
2095 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER);
2096}
2097
2098static int
2099bstp_modevent(module_t mod, int type, void *data)
2100{
2101 switch (type) {
2102 case MOD_LOAD:
2103 mtx_init(&bstp_list_mtx, "bridgestp list", NULL, MTX_DEF);
2104 LIST_INIT(&bstp_list);
2105 bstp_linkstate_p = bstp_linkstate;
2106 break;
2107 case MOD_UNLOAD:
2108 bstp_linkstate_p = NULL;
2109 mtx_destroy(&bstp_list_mtx);
2110 break;
2111 default:
2112 return (EOPNOTSUPP);
2113 }
2114 return (0);
2115}
2116
2117static moduledata_t bstp_mod = {
2118 "bridgestp",
2119 bstp_modevent,
2120 0
2121};
2122
2123DECLARE_MODULE(bridgestp, bstp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
2124MODULE_VERSION(bridgestp, 1);
2125
2126void
2127bstp_attach(struct bstp_state *bs, struct bstp_cb_ops *cb)
2128{
2129 BSTP_LOCK_INIT(bs);
2130 callout_init_mtx(&bs->bs_bstpcallout, &bs->bs_mtx, 0);
2131 LIST_INIT(&bs->bs_bplist);
2132
2133 bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE;
2134 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME;
2135 bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY;
2136 bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY;
2137 bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME;
2138 bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY;
2139 bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT;
2140 bs->bs_protover = BSTP_PROTO_RSTP;
2141 bs->bs_state_cb = cb->bcb_state;
2142 bs->bs_rtage_cb = cb->bcb_rtage;
2143
2144 getmicrotime(&bs->bs_last_tc_time);
2145
2146 mtx_lock(&bstp_list_mtx);
2147 LIST_INSERT_HEAD(&bstp_list, bs, bs_list);
2148 mtx_unlock(&bstp_list_mtx);
2149}
2150
2151void
2152bstp_detach(struct bstp_state *bs)
2153{
2154 KASSERT(LIST_EMPTY(&bs->bs_bplist), ("bstp still active"));
2155
2156 mtx_lock(&bstp_list_mtx);
2157 LIST_REMOVE(bs, bs_list);
2158 mtx_unlock(&bstp_list_mtx);
2159 callout_drain(&bs->bs_bstpcallout);
2160 BSTP_LOCK_DESTROY(bs);
2161}
2162
2163void
2164bstp_init(struct bstp_state *bs)
2165{
2166 BSTP_LOCK(bs);
2167 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs);
2168 bs->bs_running = 1;
2169 bstp_reinit(bs);
2170 BSTP_UNLOCK(bs);
2171}
2172
2173void
2174bstp_stop(struct bstp_state *bs)
2175{
2176 struct bstp_port *bp;
2177
2178 BSTP_LOCK(bs);
2179
2180 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
2181 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
2182
2183 bs->bs_running = 0;
2184 callout_stop(&bs->bs_bstpcallout);
2185 BSTP_UNLOCK(bs);
2186}
2187
2188int
2189bstp_create(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *ifp)
2190{
2191 bzero(bp, sizeof(struct bstp_port));
2192
2193 BSTP_LOCK(bs);
2194 bp->bp_ifp = ifp;
2195 bp->bp_bs = bs;
2196 bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY;
2197 TASK_INIT(&bp->bp_statetask, 0, bstp_notify_state, bp);
2198 TASK_INIT(&bp->bp_rtagetask, 0, bstp_notify_rtage, bp);
2199
2200 /* Init state */
2201 bp->bp_infois = BSTP_INFO_DISABLED;
2202 bp->bp_flags = BSTP_PORT_AUTOEDGE|BSTP_PORT_AUTOPTP;
2203 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
2204 bstp_set_port_proto(bp, bs->bs_protover);
2205 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
2206 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
2207 bp->bp_path_cost = bstp_calc_path_cost(bp);
2208 BSTP_UNLOCK(bs);
2209 return (0);
2210}
2211
2212int
2213bstp_enable(struct bstp_port *bp)
2214{
2215 struct bstp_state *bs = bp->bp_bs;
2216 struct ifnet *ifp = bp->bp_ifp;
2217
2218 KASSERT(bp->bp_active == 0, ("already a bstp member"));
2219
2220 switch (ifp->if_type) {
2221 case IFT_ETHER: /* These can do spanning tree. */
2222 break;
2223 default:
2224 /* Nothing else can. */
2225 return (EINVAL);
2226 }
2227
2228 BSTP_LOCK(bs);
2229 LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next);
2230 bp->bp_active = 1;
2231 bp->bp_flags |= BSTP_PORT_NEWINFO;
2232 bstp_reinit(bs);
2233 bstp_update_roles(bs, bp);
2234 BSTP_UNLOCK(bs);
2235 return (0);
2236}
2237
2238void
2239bstp_disable(struct bstp_port *bp)
2240{
2241 struct bstp_state *bs = bp->bp_bs;
2242
2243 KASSERT(bp->bp_active == 1, ("not a bstp member"));
2244
2245 BSTP_LOCK(bs);
2246 bstp_disable_port(bs, bp);
2247 LIST_REMOVE(bp, bp_next);
2248 bp->bp_active = 0;
2249 bstp_reinit(bs);
2250 BSTP_UNLOCK(bs);
2251}
2252
2253/*
2254 * The bstp_port structure is about to be freed by the parent bridge.
2255 */
2256void
2257bstp_destroy(struct bstp_port *bp)
2258{
2259 KASSERT(bp->bp_active == 0, ("port is still attached"));
2260 taskqueue_drain(taskqueue_swi, &bp->bp_statetask);
2261 taskqueue_drain(taskqueue_swi, &bp->bp_rtagetask);
2262}
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