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lapic timer: Reimplement set_apic_timer using lapic_timer_oneshot
[dragonfly.git] / sys / net / bridge / bridgestp.c
blobb086c60713ae11d1890ae64c59c412914967ee86
1 /*
2 * Copyright (c) 2000 Jason L. Wright (jason@thought.net)
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Jason L. Wright
16 * 4. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
25 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
27 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
28 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 *
31 * $OpenBSD: bridgestp.c,v 1.5 2001/03/22 03:48:29 jason Exp $
32 * $NetBSD: bridgestp.c,v 1.5 2003/11/28 08:56:48 keihan Exp $
33 * $FreeBSD: src/sys/net/bridgestp.c,v 1.7 2005/10/11 02:58:32 thompsa Exp $
34 * $DragonFly: src/sys/net/bridge/bridgestp.c,v 1.10 2008/11/26 12:49:43 sephe Exp $
35 */
36
37 /*
38 * Implementation of the spanning tree protocol as defined in
39 * ISO/IEC Final DIS 15802-3 (IEEE P802.1D/D17), May 25, 1998.
40 * (In English: IEEE 802.1D, Draft 17, 1998)
41 */
42
43 #include <sys/cdefs.h>
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/mbuf.h>
48 #include <sys/socket.h>
49 #include <sys/sockio.h>
50 #include <sys/kernel.h>
51 #include <sys/callout.h>
52 #include <sys/proc.h>
53 #include <sys/lock.h>
54 #include <sys/thread.h>
55 #include <sys/thread2.h>
56 #include <sys/msgport2.h>
57
58 #include <net/if.h>
59 #include <net/if_dl.h>
60 #include <net/if_types.h>
61 #include <net/if_llc.h>
62 #include <net/if_media.h>
63
64 #include <netinet/in.h>
65 #include <netinet/in_systm.h>
66 #include <netinet/in_var.h>
67 #include <netinet/if_ether.h>
68 #include <net/bridge/if_bridgevar.h>
69
70 /* BPDU message types */
71 #define BSTP_MSGTYPE_CFG 0x00 /* Configuration */
72 #define BSTP_MSGTYPE_TCN 0x80 /* Topology chg notification */
73
74 /* BPDU flags */
75 #define BSTP_FLAG_TC 0x01 /* Topology change */
76 #define BSTP_FLAG_TCA 0x80 /* Topology change ack */
77
78 #define BSTP_MESSAGE_AGE_INCR (1 * 256) /* in 256ths of a second */
79 #define BSTP_TICK_VAL (1 * 256) /* in 256ths of a second */
80
81 /*
82 * Because BPDU's do not make nicely aligned structures, two different
83 * declarations are used: bstp_?bpdu (wire representation, packed) and
84 * bstp_*_unit (internal, nicely aligned version).
85 */
86
87 /* configuration bridge protocol data unit */
88 struct bstp_cbpdu {
89 uint8_t cbu_dsap; /* LLC: destination sap */
90 uint8_t cbu_ssap; /* LLC: source sap */
91 uint8_t cbu_ctl; /* LLC: control */
92 uint16_t cbu_protoid; /* protocol id */
93 uint8_t cbu_protover; /* protocol version */
94 uint8_t cbu_bpdutype; /* message type */
95 uint8_t cbu_flags; /* flags (below) */
96
97 /* root id */
98 uint16_t cbu_rootpri; /* root priority */
99 uint8_t cbu_rootaddr[6]; /* root address */
100
101 uint32_t cbu_rootpathcost; /* root path cost */
102
103 /* bridge id */
104 uint16_t cbu_bridgepri; /* bridge priority */
105 uint8_t cbu_bridgeaddr[6]; /* bridge address */
106
107 uint16_t cbu_portid; /* port id */
108 uint16_t cbu_messageage; /* current message age */
109 uint16_t cbu_maxage; /* maximum age */
110 uint16_t cbu_hellotime; /* hello time */
111 uint16_t cbu_forwarddelay; /* forwarding delay */
112 } __attribute__((__packed__));
113
114 /* topology change notification bridge protocol data unit */
115 struct bstp_tbpdu {
116 uint8_t tbu_dsap; /* LLC: destination sap */
117 uint8_t tbu_ssap; /* LLC: source sap */
118 uint8_t tbu_ctl; /* LLC: control */
119 uint16_t tbu_protoid; /* protocol id */
120 uint8_t tbu_protover; /* protocol version */
121 uint8_t tbu_bpdutype; /* message type */
122 } __attribute__((__packed__));
123
124 const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
125
126 static void bstp_initialize_port(struct bridge_softc *,
127 struct bridge_iflist *);
128 static void bstp_ifupdstatus(struct bridge_softc *, struct bridge_iflist *);
129 static void bstp_enable_port(struct bridge_softc *, struct bridge_iflist *);
130 static void bstp_disable_port(struct bridge_softc *,
131 struct bridge_iflist *);
132 #ifdef notused
133 static void bstp_enable_change_detection(struct bridge_iflist *);
134 static void bstp_disable_change_detection(struct bridge_iflist *);
135 #endif /* notused */
136 static int bstp_root_bridge(struct bridge_softc *sc);
137 static int bstp_supersedes_port_info(struct bridge_softc *,
138 struct bridge_iflist *, struct bstp_config_unit *);
139 static int bstp_designated_port(struct bridge_softc *,
140 struct bridge_iflist *);
141 static int bstp_designated_for_some_port(struct bridge_softc *);
142 static void bstp_transmit_config(struct bridge_softc *,
143 struct bridge_iflist *);
144 static void bstp_transmit_tcn(struct bridge_softc *);
145 static void bstp_received_config_bpdu(struct bridge_softc *,
146 struct bridge_iflist *, struct bstp_config_unit *);
147 static void bstp_received_tcn_bpdu(struct bridge_softc *,
148 struct bridge_iflist *, struct bstp_tcn_unit *);
149 static void bstp_record_config_information(struct bridge_softc *,
150 struct bridge_iflist *, struct bstp_config_unit *);
151 static void bstp_record_config_timeout_values(struct bridge_softc *,
152 struct bstp_config_unit *);
153 static void bstp_config_bpdu_generation(struct bridge_softc *);
154 static void bstp_send_config_bpdu(struct bridge_softc *,
155 struct bridge_iflist *, struct bstp_config_unit *);
156 static void bstp_configuration_update(struct bridge_softc *);
157 static void bstp_root_selection(struct bridge_softc *);
158 static void bstp_designated_port_selection(struct bridge_softc *);
159 static void bstp_become_designated_port(struct bridge_softc *,
160 struct bridge_iflist *);
161 static void bstp_port_state_selection(struct bridge_softc *);
162 static void bstp_make_forwarding(struct bridge_softc *,
163 struct bridge_iflist *);
164 static void bstp_make_blocking(struct bridge_softc *,
165 struct bridge_iflist *);
166 static void bstp_set_port_state(struct bridge_iflist *, uint8_t);
167 #ifdef notused
168 static void bstp_set_bridge_priority(struct bridge_softc *, uint64_t);
169 static void bstp_set_port_priority(struct bridge_softc *,
170 struct bridge_iflist *, uint16_t);
171 static void bstp_set_path_cost(struct bridge_softc *,
172 struct bridge_iflist *, uint32_t);
173 #endif /* notused */
174 static void bstp_topology_change_detection(struct bridge_softc *);
175 static void bstp_topology_change_acknowledged(struct bridge_softc *);
176 static void bstp_acknowledge_topology_change(struct bridge_softc *,
177 struct bridge_iflist *);
178
179 static void bstp_tick(void *);
180 static void bstp_timer_start(struct bridge_timer *, uint16_t);
181 static void bstp_timer_stop(struct bridge_timer *);
182 static int bstp_timer_expired(struct bridge_timer *, uint16_t);
183
184 static void bstp_hold_timer_expiry(struct bridge_softc *,
185 struct bridge_iflist *);
186 static void bstp_message_age_timer_expiry(struct bridge_softc *,
187 struct bridge_iflist *);
188 static void bstp_forward_delay_timer_expiry(struct bridge_softc *,
189 struct bridge_iflist *);
190 static void bstp_topology_change_timer_expiry(struct bridge_softc *);
191 static void bstp_tcn_timer_expiry(struct bridge_softc *);
192 static void bstp_hello_timer_expiry(struct bridge_softc *);
193 static int bstp_addr_cmp(const uint8_t *, const uint8_t *);
194
195 static void
196 bstp_transmit_config(struct bridge_softc *sc, struct bridge_iflist *bif)
197 {
198 if (bif->bif_hold_timer.active) {
199 bif->bif_config_pending = 1;
200 return;
201 }
202
203 bif->bif_config_bpdu.cu_message_type = BSTP_MSGTYPE_CFG;
204 bif->bif_config_bpdu.cu_rootid = sc->sc_designated_root;
205 bif->bif_config_bpdu.cu_root_path_cost = sc->sc_root_path_cost;
206 bif->bif_config_bpdu.cu_bridge_id = sc->sc_bridge_id;
207 bif->bif_config_bpdu.cu_port_id = bif->bif_port_id;
208
209 if (bstp_root_bridge(sc)) {
210 bif->bif_config_bpdu.cu_message_age = 0;
211 } else {
212 bif->bif_config_bpdu.cu_message_age =
213 sc->sc_root_port->bifi_message_age_timer.value +
214 BSTP_MESSAGE_AGE_INCR;
215 }
216
217 bif->bif_config_bpdu.cu_max_age = sc->sc_max_age;
218 bif->bif_config_bpdu.cu_hello_time = sc->sc_hello_time;
219 bif->bif_config_bpdu.cu_forward_delay = sc->sc_forward_delay;
220 bif->bif_config_bpdu.cu_topology_change_acknowledgment
221 = bif->bif_topology_change_acknowledge;
222 bif->bif_config_bpdu.cu_topology_change = sc->sc_topology_change;
223
224 if (bif->bif_config_bpdu.cu_message_age < sc->sc_max_age) {
225 bif->bif_topology_change_acknowledge = 0;
226 bif->bif_config_pending = 0;
227 bstp_send_config_bpdu(sc, bif, &bif->bif_config_bpdu);
228 bstp_timer_start(&bif->bif_hold_timer, 0);
229 }
230 }
231
232 static void
233 bstp_send_config_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif,
234 struct bstp_config_unit *cu)
235 {
236 struct ifnet *ifp;
237 struct mbuf *m;
238 struct ether_header *eh;
239 struct bstp_cbpdu bpdu;
240
241 ifp = bif->bif_ifp;
242
243 if ((ifp->if_flags & IFF_RUNNING) == 0)
244 return;
245
246 MGETHDR(m, MB_DONTWAIT, MT_DATA);
247 if (m == NULL)
248 return;
249
250 eh = mtod(m, struct ether_header *);
251
252 m->m_pkthdr.rcvif = ifp;
253 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu);
254 m->m_len = m->m_pkthdr.len;
255
256 bpdu.cbu_ssap = bpdu.cbu_dsap = LLC_8021D_LSAP;
257 bpdu.cbu_ctl = LLC_UI;
258 bpdu.cbu_protoid = htons(0);
259 bpdu.cbu_protover = 0;
260 bpdu.cbu_bpdutype = cu->cu_message_type;
261 bpdu.cbu_flags = (cu->cu_topology_change ? BSTP_FLAG_TC : 0) |
262 (cu->cu_topology_change_acknowledgment ? BSTP_FLAG_TCA : 0);
263
264 bpdu.cbu_rootpri = htons(cu->cu_rootid >> 48);
265 bpdu.cbu_rootaddr[0] = cu->cu_rootid >> 40;
266 bpdu.cbu_rootaddr[1] = cu->cu_rootid >> 32;
267 bpdu.cbu_rootaddr[2] = cu->cu_rootid >> 24;
268 bpdu.cbu_rootaddr[3] = cu->cu_rootid >> 16;
269 bpdu.cbu_rootaddr[4] = cu->cu_rootid >> 8;
270 bpdu.cbu_rootaddr[5] = cu->cu_rootid >> 0;
271
272 bpdu.cbu_rootpathcost = htonl(cu->cu_root_path_cost);
273
274 bpdu.cbu_bridgepri = htons(cu->cu_bridge_id >> 48);
275 bpdu.cbu_bridgeaddr[0] = cu->cu_bridge_id >> 40;
276 bpdu.cbu_bridgeaddr[1] = cu->cu_bridge_id >> 32;
277 bpdu.cbu_bridgeaddr[2] = cu->cu_bridge_id >> 24;
278 bpdu.cbu_bridgeaddr[3] = cu->cu_bridge_id >> 16;
279 bpdu.cbu_bridgeaddr[4] = cu->cu_bridge_id >> 8;
280 bpdu.cbu_bridgeaddr[5] = cu->cu_bridge_id >> 0;
281
282 bpdu.cbu_portid = htons(cu->cu_port_id);
283 bpdu.cbu_messageage = htons(cu->cu_message_age);
284 bpdu.cbu_maxage = htons(cu->cu_max_age);
285 bpdu.cbu_hellotime = htons(cu->cu_hello_time);
286 bpdu.cbu_forwarddelay = htons(cu->cu_forward_delay);
287
288 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
289 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
290 eh->ether_type = htons(sizeof(bpdu));
291
292 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu));
293
294 bridge_enqueue(ifp, m);
295 }
296
297 static int
298 bstp_root_bridge(struct bridge_softc *sc)
299 {
300 return (sc->sc_designated_root == sc->sc_bridge_id);
301 }
302
303 static int
304 bstp_supersedes_port_info(struct bridge_softc *sc, struct bridge_iflist *bif,
305 struct bstp_config_unit *cu)
306 {
307 if (cu->cu_rootid < bif->bif_designated_root)
308 return (1);
309 if (cu->cu_rootid > bif->bif_designated_root)
310 return (0);
311
312 if (cu->cu_root_path_cost < bif->bif_designated_cost)
313 return (1);
314 if (cu->cu_root_path_cost > bif->bif_designated_cost)
315 return (0);
316
317 if (cu->cu_bridge_id < bif->bif_designated_bridge)
318 return (1);
319 if (cu->cu_bridge_id > bif->bif_designated_bridge)
320 return (0);
321
322 if (sc->sc_bridge_id != cu->cu_bridge_id)
323 return (1);
324 if (cu->cu_port_id <= bif->bif_designated_port)
325 return (1);
326 return (0);
327 }
328
329 static void
330 bstp_record_config_information(struct bridge_softc *sc,
331 struct bridge_iflist *bif, struct bstp_config_unit *cu)
332 {
333 bif->bif_designated_root = cu->cu_rootid;
334 bif->bif_designated_cost = cu->cu_root_path_cost;
335 bif->bif_designated_bridge = cu->cu_bridge_id;
336 bif->bif_designated_port = cu->cu_port_id;
337 bstp_timer_start(&bif->bif_message_age_timer, cu->cu_message_age);
338 }
339
340 static void
341 bstp_record_config_timeout_values(struct bridge_softc *sc,
342 struct bstp_config_unit *config)
343 {
344 sc->sc_max_age = config->cu_max_age;
345 sc->sc_hello_time = config->cu_hello_time;
346 sc->sc_forward_delay = config->cu_forward_delay;
347 sc->sc_topology_change = config->cu_topology_change;
348 }
349
350 static void
351 bstp_config_bpdu_generation(struct bridge_softc *sc)
352 {
353 struct bridge_iflist *bif, *nbif;
354
355 LIST_FOREACH_MUTABLE(bif, &sc->sc_iflists[mycpuid], bif_next, nbif) {
356 if ((bif->bif_flags & IFBIF_STP) == 0)
357 continue;
358 if (bstp_designated_port(sc, bif) &&
359 (bif->bif_state != BSTP_IFSTATE_DISABLED))
360 bstp_transmit_config(sc, bif);
361
362 if (nbif != NULL && !nbif->bif_onlist) {
363 KKASSERT(bif->bif_onlist);
364 nbif = LIST_NEXT(bif, bif_next);
365 }
366 }
367 }
368
369 static int
370 bstp_designated_port(struct bridge_softc *sc, struct bridge_iflist *bif)
371 {
372 return ((bif->bif_designated_bridge == sc->sc_bridge_id)
373 && (bif->bif_designated_port == bif->bif_port_id));
374 }
375
376 static void
377 bstp_transmit_tcn(struct bridge_softc *sc)
378 {
379 struct bstp_tbpdu bpdu;
380 struct ifnet *ifp = sc->sc_root_port->bifi_ifp;
381 struct ether_header *eh;
382 struct mbuf *m;
383
384 if ((ifp->if_flags & IFF_RUNNING) == 0)
385 return;
386
387 MGETHDR(m, MB_DONTWAIT, MT_DATA);
388 if (m == NULL)
389 return;
390
391 m->m_pkthdr.rcvif = ifp;
392 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu);
393 m->m_len = m->m_pkthdr.len;
394
395 eh = mtod(m, struct ether_header *);
396
397 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
398 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
399 eh->ether_type = htons(sizeof(bpdu));
400
401 bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP;
402 bpdu.tbu_ctl = LLC_UI;
403 bpdu.tbu_protoid = 0;
404 bpdu.tbu_protover = 0;
405 bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN;
406
407 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu));
408
409 bridge_enqueue(ifp, m);
410 }
411
412 static void
413 bstp_configuration_update(struct bridge_softc *sc)
414 {
415 bstp_root_selection(sc);
416 bstp_designated_port_selection(sc);
417 }
418
419 static void
420 bstp_root_selection(struct bridge_softc *sc)
421 {
422 struct bridge_iflist *root_port = NULL, *bif;
423
424 LIST_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
425 if ((bif->bif_flags & IFBIF_STP) == 0)
426 continue;
427 if (bstp_designated_port(sc, bif))
428 continue;
429 if (bif->bif_state == BSTP_IFSTATE_DISABLED)
430 continue;
431 if (bif->bif_designated_root >= sc->sc_bridge_id)
432 continue;
433 if (root_port == NULL)
434 goto set_port;
435
436 if (bif->bif_designated_root < root_port->bif_designated_root)
437 goto set_port;
438 if (bif->bif_designated_root > root_port->bif_designated_root)
439 continue;
440
441 if ((bif->bif_designated_cost + bif->bif_path_cost) <
442 (root_port->bif_designated_cost + root_port->bif_path_cost))
443 goto set_port;
444 if ((bif->bif_designated_cost + bif->bif_path_cost) >
445 (root_port->bif_designated_cost + root_port->bif_path_cost))
446 continue;
447
448 if (bif->bif_designated_bridge <
449 root_port->bif_designated_bridge)
450 goto set_port;
451 if (bif->bif_designated_bridge >
452 root_port->bif_designated_bridge)
453 continue;
454
455 if (bif->bif_designated_port < root_port->bif_designated_port)
456 goto set_port;
457 if (bif->bif_designated_port > root_port->bif_designated_port)
458 continue;
459
460 if (bif->bif_port_id >= root_port->bif_port_id)
461 continue;
462 set_port:
463 root_port = bif;
464 }
465
466 if (root_port == NULL) {
467 sc->sc_root_port = NULL;
468 sc->sc_designated_root = sc->sc_bridge_id;
469 sc->sc_root_path_cost = 0;
470 } else {
471 sc->sc_root_port = root_port->bif_info;
472 sc->sc_designated_root = root_port->bif_designated_root;
473 sc->sc_root_path_cost = root_port->bif_designated_cost +
474 root_port->bif_path_cost;
475 }
476 }
477
478 static void
479 bstp_designated_port_selection(struct bridge_softc *sc)
480 {
481 struct bridge_iflist *bif;
482
483 LIST_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
484 if ((bif->bif_flags & IFBIF_STP) == 0)
485 continue;
486 if (bstp_designated_port(sc, bif))
487 goto designated;
488 if (bif->bif_designated_root != sc->sc_designated_root)
489 goto designated;
490
491 if (sc->sc_root_path_cost < bif->bif_designated_cost)
492 goto designated;
493 if (sc->sc_root_path_cost > bif->bif_designated_cost)
494 continue;
495
496 if (sc->sc_bridge_id < bif->bif_designated_bridge)
497 goto designated;
498 if (sc->sc_bridge_id > bif->bif_designated_bridge)
499 continue;
500
501 if (bif->bif_port_id > bif->bif_designated_port)
502 continue;
503 designated:
504 bstp_become_designated_port(sc, bif);
505 }
506 }
507
508 static void
509 bstp_become_designated_port(struct bridge_softc *sc, struct bridge_iflist *bif)
510 {
511 bif->bif_designated_root = sc->sc_designated_root;
512 bif->bif_designated_cost = sc->sc_root_path_cost;
513 bif->bif_designated_bridge = sc->sc_bridge_id;
514 bif->bif_designated_port = bif->bif_port_id;
515 }
516
517 static void
518 bstp_port_state_selection(struct bridge_softc *sc)
519 {
520 struct bridge_iflist *bif, *nbif;
521
522 LIST_FOREACH_MUTABLE(bif, &sc->sc_iflists[mycpuid], bif_next, nbif) {
523 if ((bif->bif_flags & IFBIF_STP) == 0)
524 continue;
525 if (bif->bif_info == sc->sc_root_port) {
526 bif->bif_config_pending = 0;
527 bif->bif_topology_change_acknowledge = 0;
528 bstp_make_forwarding(sc, bif);
529 } else if (bstp_designated_port(sc, bif)) {
530 bstp_timer_stop(&bif->bif_message_age_timer);
531 bstp_make_forwarding(sc, bif);
532 } else {
533 bif->bif_config_pending = 0;
534 bif->bif_topology_change_acknowledge = 0;
535 bstp_make_blocking(sc, bif);
536 }
537
538 if (nbif != NULL && !nbif->bif_onlist) {
539 KKASSERT(bif->bif_onlist);
540 nbif = LIST_NEXT(bif, bif_next);
541 }
542 }
543 }
544
545 static void
546 bstp_make_forwarding(struct bridge_softc *sc, struct bridge_iflist *bif)
547 {
548 if (bif->bif_state == BSTP_IFSTATE_BLOCKING) {
549 bstp_set_port_state(bif, BSTP_IFSTATE_LISTENING);
550 bstp_timer_start(&bif->bif_forward_delay_timer, 0);
551 }
552 }
553
554 static void
555 bstp_make_blocking(struct bridge_softc *sc, struct bridge_iflist *bif)
556 {
557 if ((bif->bif_state != BSTP_IFSTATE_DISABLED) &&
558 (bif->bif_state != BSTP_IFSTATE_BLOCKING)) {
559 if ((bif->bif_state == BSTP_IFSTATE_FORWARDING) ||
560 (bif->bif_state == BSTP_IFSTATE_LEARNING)) {
561 if (bif->bif_change_detection_enabled) {
562 bstp_topology_change_detection(sc);
563 }
564 }
565 bstp_set_port_state(bif, BSTP_IFSTATE_BLOCKING);
566 bridge_rtdelete(sc, bif->bif_ifp, IFBF_FLUSHDYN);
567 bstp_timer_stop(&bif->bif_forward_delay_timer);
568 }
569 }
570
571 static void
572 bstp_set_port_state(struct bridge_iflist *bif, uint8_t state)
573 {
574 bif->bif_state = state;
575 }
576
577 static void
578 bstp_topology_change_detection(struct bridge_softc *sc)
579 {
580 if (bstp_root_bridge(sc)) {
581 sc->sc_topology_change = 1;
582 bstp_timer_start(&sc->sc_topology_change_timer, 0);
583 } else if (!sc->sc_topology_change_detected) {
584 bstp_transmit_tcn(sc);
585 bstp_timer_start(&sc->sc_tcn_timer, 0);
586 }
587 sc->sc_topology_change_detected = 1;
588 }
589
590 static void
591 bstp_topology_change_acknowledged(struct bridge_softc *sc)
592 {
593 sc->sc_topology_change_detected = 0;
594 bstp_timer_stop(&sc->sc_tcn_timer);
595 }
596
597 static void
598 bstp_acknowledge_topology_change(struct bridge_softc *sc,
599 struct bridge_iflist *bif)
600 {
601 bif->bif_topology_change_acknowledge = 1;
602 bstp_transmit_config(sc, bif);
603 }
604
605 void
606 bstp_input(struct bridge_softc *sc, struct bridge_iflist *bif, struct mbuf *m)
607 {
608 struct ether_header *eh;
609 struct bstp_tbpdu tpdu;
610 struct bstp_cbpdu cpdu;
611 struct bstp_config_unit cu;
612 struct bstp_tcn_unit tu;
613 uint16_t len;
614
615 if ((bif->bif_flags & IFBIF_STP) == 0)
616 goto out;
617
618 eh = mtod(m, struct ether_header *);
619
620 len = ntohs(eh->ether_type);
621 if (len < sizeof(tpdu))
622 goto out;
623
624 m_adj(m, ETHER_HDR_LEN);
625
626 if (m->m_pkthdr.len > len)
627 m_adj(m, len - m->m_pkthdr.len);
628 if (m->m_len < sizeof(tpdu) &&
629 (m = m_pullup(m, sizeof(tpdu))) == NULL)
630 goto out;
631
632 memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu));
633
634 if (tpdu.tbu_dsap != LLC_8021D_LSAP ||
635 tpdu.tbu_ssap != LLC_8021D_LSAP ||
636 tpdu.tbu_ctl != LLC_UI)
637 goto out;
638 if (tpdu.tbu_protoid != 0 || tpdu.tbu_protover != 0)
639 goto out;
640
641 switch (tpdu.tbu_bpdutype) {
642 case BSTP_MSGTYPE_TCN:
643 tu.tu_message_type = tpdu.tbu_bpdutype;
644 bstp_received_tcn_bpdu(sc, bif, &tu);
645 break;
646 case BSTP_MSGTYPE_CFG:
647 if (m->m_len < sizeof(cpdu) &&
648 (m = m_pullup(m, sizeof(cpdu))) == NULL)
649 goto out;
650 memcpy(&cpdu, mtod(m, caddr_t), sizeof(cpdu));
651
652 cu.cu_rootid =
653 (((uint64_t)ntohs(cpdu.cbu_rootpri)) << 48) |
654 (((uint64_t)cpdu.cbu_rootaddr[0]) << 40) |
655 (((uint64_t)cpdu.cbu_rootaddr[1]) << 32) |
656 (((uint64_t)cpdu.cbu_rootaddr[2]) << 24) |
657 (((uint64_t)cpdu.cbu_rootaddr[3]) << 16) |
658 (((uint64_t)cpdu.cbu_rootaddr[4]) << 8) |
659 (((uint64_t)cpdu.cbu_rootaddr[5]) << 0);
660
661 cu.cu_bridge_id =
662 (((uint64_t)ntohs(cpdu.cbu_bridgepri)) << 48) |
663 (((uint64_t)cpdu.cbu_bridgeaddr[0]) << 40) |
664 (((uint64_t)cpdu.cbu_bridgeaddr[1]) << 32) |
665 (((uint64_t)cpdu.cbu_bridgeaddr[2]) << 24) |
666 (((uint64_t)cpdu.cbu_bridgeaddr[3]) << 16) |
667 (((uint64_t)cpdu.cbu_bridgeaddr[4]) << 8) |
668 (((uint64_t)cpdu.cbu_bridgeaddr[5]) << 0);
669
670 cu.cu_root_path_cost = ntohl(cpdu.cbu_rootpathcost);
671 cu.cu_message_age = ntohs(cpdu.cbu_messageage);
672 cu.cu_max_age = ntohs(cpdu.cbu_maxage);
673 cu.cu_hello_time = ntohs(cpdu.cbu_hellotime);
674 cu.cu_forward_delay = ntohs(cpdu.cbu_forwarddelay);
675 cu.cu_port_id = ntohs(cpdu.cbu_portid);
676 cu.cu_message_type = cpdu.cbu_bpdutype;
677 cu.cu_topology_change_acknowledgment =
678 (cpdu.cbu_flags & BSTP_FLAG_TCA) ? 1 : 0;
679 cu.cu_topology_change =
680 (cpdu.cbu_flags & BSTP_FLAG_TC) ? 1 : 0;
681 bstp_received_config_bpdu(sc, bif, &cu);
682 break;
683 default:
684 goto out;
685 }
686 out:
687 if (m)
688 m_freem(m);
689 }
690
691 static void
692 bstp_received_config_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif,
693 struct bstp_config_unit *cu)
694 {
695 int root;
696
697 root = bstp_root_bridge(sc);
698
699 if (bif->bif_state != BSTP_IFSTATE_DISABLED) {
700 if (bstp_supersedes_port_info(sc, bif, cu)) {
701 bstp_record_config_information(sc, bif, cu);
702 bstp_configuration_update(sc);
703 bstp_port_state_selection(sc);
704
705 if ((bstp_root_bridge(sc) == 0) && root) {
706 bstp_timer_stop(&sc->sc_hello_timer);
707
708 if (sc->sc_topology_change_detected) {
709 bstp_timer_stop(
710 &sc->sc_topology_change_timer);
711 bstp_transmit_tcn(sc);
712 bstp_timer_start(&sc->sc_tcn_timer, 0);
713 }
714 }
715
716 if (bif->bif_info == sc->sc_root_port) {
717 bstp_record_config_timeout_values(sc, cu);
718 bstp_config_bpdu_generation(sc);
719
720 if (cu->cu_topology_change_acknowledgment)
721 bstp_topology_change_acknowledged(sc);
722 }
723 } else if (bstp_designated_port(sc, bif))
724 bstp_transmit_config(sc, bif);
725 }
726 }
727
728 static void
729 bstp_received_tcn_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif,
730 struct bstp_tcn_unit *tcn)
731 {
732 if (bif->bif_state != BSTP_IFSTATE_DISABLED &&
733 bstp_designated_port(sc, bif)) {
734 bstp_topology_change_detection(sc);
735 bstp_acknowledge_topology_change(sc, bif);
736 }
737 }
738
739 static void
740 bstp_hello_timer_expiry(struct bridge_softc *sc)
741 {
742 bstp_config_bpdu_generation(sc);
743 bstp_timer_start(&sc->sc_hello_timer, 0);
744 }
745
746 static void
747 bstp_message_age_timer_expiry(struct bridge_softc *sc,
748 struct bridge_iflist *bif)
749 {
750 int root;
751
752 root = bstp_root_bridge(sc);
753 bstp_become_designated_port(sc, bif);
754 bstp_configuration_update(sc);
755 bstp_port_state_selection(sc);
756
757 if ((bstp_root_bridge(sc)) && (root == 0)) {
758 sc->sc_max_age = sc->sc_bridge_max_age;
759 sc->sc_hello_time = sc->sc_bridge_hello_time;
760 sc->sc_forward_delay = sc->sc_bridge_forward_delay;
761
762 bstp_topology_change_detection(sc);
763 bstp_timer_stop(&sc->sc_tcn_timer);
764 bstp_config_bpdu_generation(sc);
765 bstp_timer_start(&sc->sc_hello_timer, 0);
766 }
767 }
768
769 static void
770 bstp_forward_delay_timer_expiry(struct bridge_softc *sc,
771 struct bridge_iflist *bif)
772 {
773 if (bif->bif_state == BSTP_IFSTATE_LISTENING) {
774 bstp_set_port_state(bif, BSTP_IFSTATE_LEARNING);
775 bstp_timer_start(&bif->bif_forward_delay_timer, 0);
776 } else if (bif->bif_state == BSTP_IFSTATE_LEARNING) {
777 bstp_set_port_state(bif, BSTP_IFSTATE_FORWARDING);
778 if (bstp_designated_for_some_port(sc) &&
779 bif->bif_change_detection_enabled)
780 bstp_topology_change_detection(sc);
781 }
782 }
783
784 static int
785 bstp_designated_for_some_port(struct bridge_softc *sc)
786 {
787
788 struct bridge_iflist *bif;
789
790 LIST_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
791 if ((bif->bif_flags & IFBIF_STP) == 0)
792 continue;
793 if (bif->bif_designated_bridge == sc->sc_bridge_id)
794 return (1);
795 }
796 return (0);
797 }
798
799 static void
800 bstp_tcn_timer_expiry(struct bridge_softc *sc)
801 {
802 bstp_transmit_tcn(sc);
803 bstp_timer_start(&sc->sc_tcn_timer, 0);
804 }
805
806 static void
807 bstp_topology_change_timer_expiry(struct bridge_softc *sc)
808 {
809 sc->sc_topology_change_detected = 0;
810 sc->sc_topology_change = 0;
811 }
812
813 static void
814 bstp_hold_timer_expiry(struct bridge_softc *sc, struct bridge_iflist *bif)
815 {
816 if (bif->bif_config_pending)
817 bstp_transmit_config(sc, bif);
818 }
819
820 static int
821 bstp_addr_cmp(const uint8_t *a, const uint8_t *b)
822 {
823 int i, d;
824
825 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
826 d = ((int)a[i]) - ((int)b[i]);
827 }
828
829 return (d);
830 }
831
832 void
833 bstp_initialization(struct bridge_softc *sc)
834 {
835 struct bridge_iflist *bif, *mif, *nbif;
836 u_char *e_addr;
837
838 KKASSERT(&curthread->td_msgport == BRIDGE_CFGPORT);
839
840 mif = NULL;
841 LIST_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
842 if ((bif->bif_flags & IFBIF_STP) == 0)
843 continue;
844 if (bif->bif_ifp->if_type != IFT_ETHER)
845 continue;
846 bif->bif_port_id = (bif->bif_priority << 8) |
847 (bif->bif_ifp->if_index & 0xff);
848
849 if (mif == NULL) {
850 mif = bif;
851 continue;
852 }
853 if (bstp_addr_cmp(IF_LLADDR(bif->bif_ifp),
854 IF_LLADDR(mif->bif_ifp)) < 0) {
855 mif = bif;
856 continue;
857 }
858 }
859 if (mif == NULL) {
860 bstp_stop(sc);
861 return;
862 }
863
864 e_addr = IF_LLADDR(mif->bif_ifp);
865 sc->sc_bridge_id =
866 (((uint64_t)sc->sc_bridge_priority) << 48) |
867 (((uint64_t)e_addr[0]) << 40) |
868 (((uint64_t)e_addr[1]) << 32) |
869 (((uint64_t)e_addr[2]) << 24) |
870 (((uint64_t)e_addr[3]) << 16) |
871 (((uint64_t)e_addr[4]) << 8) |
872 (((uint64_t)e_addr[5]));
873
874 sc->sc_designated_root = sc->sc_bridge_id;
875 sc->sc_root_path_cost = 0;
876 sc->sc_root_port = NULL;
877
878 sc->sc_max_age = sc->sc_bridge_max_age;
879 sc->sc_hello_time = sc->sc_bridge_hello_time;
880 sc->sc_forward_delay = sc->sc_bridge_forward_delay;
881 sc->sc_topology_change_detected = 0;
882 sc->sc_topology_change = 0;
883 bstp_timer_stop(&sc->sc_tcn_timer);
884 bstp_timer_stop(&sc->sc_topology_change_timer);
885
886 if (callout_pending(&sc->sc_bstpcallout) == 0)
887 callout_reset(&sc->sc_bstpcallout, hz,
888 bstp_tick, sc);
889
890 LIST_FOREACH_MUTABLE(bif, &sc->sc_iflists[mycpuid], bif_next, nbif) {
891 if (bif->bif_flags & IFBIF_STP)
892 bstp_ifupdstatus(sc, bif);
893 else
894 bstp_disable_port(sc, bif);
895
896 if (nbif != NULL && !nbif->bif_onlist) {
897 KKASSERT(bif->bif_onlist);
898 nbif = LIST_NEXT(bif, bif_next);
899 }
900 }
901
902 bstp_port_state_selection(sc);
903 bstp_config_bpdu_generation(sc);
904 bstp_timer_start(&sc->sc_hello_timer, 0);
905 }
906
907 void
908 bstp_stop(struct bridge_softc *sc)
909 {
910 struct bridge_iflist *bif;
911 struct lwkt_msg *lmsg;
912
913 KKASSERT(&curthread->td_msgport == BRIDGE_CFGPORT);
914
915 LIST_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
916 bstp_set_port_state(bif, BSTP_IFSTATE_DISABLED);
917 bstp_timer_stop(&bif->bif_hold_timer);
918 bstp_timer_stop(&bif->bif_message_age_timer);
919 bstp_timer_stop(&bif->bif_forward_delay_timer);
920 }
921
922 callout_stop(&sc->sc_bstpcallout);
923
924 bstp_timer_stop(&sc->sc_topology_change_timer);
925 bstp_timer_stop(&sc->sc_tcn_timer);
926 bstp_timer_stop(&sc->sc_hello_timer);
927
928 crit_enter();
929 lmsg = &sc->sc_bstptimemsg.nm_lmsg;
930 if ((lmsg->ms_flags & MSGF_DONE) == 0) {
931 /* Pending to be processed; drop it */
932 lwkt_dropmsg(lmsg);
933 }
934 crit_exit();
935 }
936
937 static void
938 bstp_initialize_port(struct bridge_softc *sc, struct bridge_iflist *bif)
939 {
940 bstp_become_designated_port(sc, bif);
941 bstp_set_port_state(bif, BSTP_IFSTATE_BLOCKING);
942 bif->bif_topology_change_acknowledge = 0;
943 bif->bif_config_pending = 0;
944 bif->bif_change_detection_enabled = 1;
945 bstp_timer_stop(&bif->bif_message_age_timer);
946 bstp_timer_stop(&bif->bif_forward_delay_timer);
947 bstp_timer_stop(&bif->bif_hold_timer);
948 }
949
950 static void
951 bstp_enable_port(struct bridge_softc *sc, struct bridge_iflist *bif)
952 {
953 bstp_initialize_port(sc, bif);
954 bstp_port_state_selection(sc);
955 }
956
957 static void
958 bstp_disable_port(struct bridge_softc *sc, struct bridge_iflist *bif)
959 {
960 int root;
961
962 root = bstp_root_bridge(sc);
963 bstp_become_designated_port(sc, bif);
964 bstp_set_port_state(bif, BSTP_IFSTATE_DISABLED);
965 bif->bif_topology_change_acknowledge = 0;
966 bif->bif_config_pending = 0;
967 bstp_timer_stop(&bif->bif_message_age_timer);
968 bstp_timer_stop(&bif->bif_forward_delay_timer);
969 bstp_configuration_update(sc);
970 bstp_port_state_selection(sc);
971 bridge_rtdelete(sc, bif->bif_ifp, IFBF_FLUSHDYN);
972
973 if (bstp_root_bridge(sc) && (root == 0)) {
974 sc->sc_max_age = sc->sc_bridge_max_age;
975 sc->sc_hello_time = sc->sc_bridge_hello_time;
976 sc->sc_forward_delay = sc->sc_bridge_forward_delay;
977
978 bstp_topology_change_detection(sc);
979 bstp_timer_stop(&sc->sc_tcn_timer);
980 bstp_config_bpdu_generation(sc);
981 bstp_timer_start(&sc->sc_hello_timer, 0);
982 }
983 }
984
985 #ifdef notused
986 static void
987 bstp_set_bridge_priority(struct bridge_softc *sc, uint64_t new_bridge_id)
988 {
989 struct bridge_iflist *bif;
990 int root;
991
992 root = bstp_root_bridge(sc);
993
994 LIST_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
995 if ((bif->bif_flags & IFBIF_STP) == 0)
996 continue;
997 if (bstp_designated_port(sc, bif))
998 bif->bif_designated_bridge = new_bridge_id;
999 }
1000
1001 sc->sc_bridge_id = new_bridge_id;
1002
1003 bstp_configuration_update(sc);
1004 bstp_port_state_selection(sc);
1005
1006 if (bstp_root_bridge(sc) && (root == 0)) {
1007 sc->sc_max_age = sc->sc_bridge_max_age;
1008 sc->sc_hello_time = sc->sc_bridge_hello_time;
1009 sc->sc_forward_delay = sc->sc_bridge_forward_delay;
1010
1011 bstp_topology_change_detection(sc);
1012 bstp_timer_stop(&sc->sc_tcn_timer);
1013 bstp_config_bpdu_generation(sc);
1014 bstp_timer_start(&sc->sc_hello_timer, 0);
1015 }
1016 }
1017
1018 static void
1019 bstp_set_port_priority(struct bridge_softc *sc, struct bridge_iflist *bif,
1020 uint16_t new_port_id)
1021 {
1022 if (bstp_designated_port(sc, bif))
1023 bif->bif_designated_port = new_port_id;
1024
1025 bif->bif_port_id = new_port_id;
1026
1027 if ((sc->sc_bridge_id == bif->bif_designated_bridge) &&
1028 (bif->bif_port_id < bif->bif_designated_port)) {
1029 bstp_become_designated_port(sc, bif);
1030 bstp_port_state_selection(sc);
1031 }
1032 }
1033
1034 static void
1035 bstp_set_path_cost(struct bridge_softc *sc, struct bridge_iflist *bif,
1036 uint32_t path_cost)
1037 {
1038 bif->bif_path_cost = path_cost;
1039 bstp_configuration_update(sc);
1040 bstp_port_state_selection(sc);
1041 }
1042
1043 static void
1044 bstp_enable_change_detection(struct bridge_iflist *bif)
1045 {
1046 bif->bif_change_detection_enabled = 1;
1047 }
1048
1049 static void
1050 bstp_disable_change_detection(struct bridge_iflist *bif)
1051 {
1052 bif->bif_change_detection_enabled = 0;
1053 }
1054 #endif /* notused */
1055
1056 void
1057 bstp_linkstate(struct ifnet *ifp, int state)
1058 {
1059 struct bridge_softc *sc;
1060 struct bridge_iflist *bif;
1061
1062 sc = ifp->if_bridge;
1063 ifnet_serialize_all(sc->sc_ifp);
1064
1065 /*
1066 * bstp_ifupdstatus() may block, but it is the last
1067 * operation of the member iface iteration, so we
1068 * don't need to use LIST_FOREACH_MUTABLE()+bif_onlist
1069 * check here.
1070 */
1071 LIST_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
1072 if ((bif->bif_flags & IFBIF_STP) == 0)
1073 continue;
1074
1075 if (bif->bif_ifp == ifp) {
1076 bstp_ifupdstatus(sc, bif);
1077 break;
1078 }
1079 }
1080 ifnet_deserialize_all(sc->sc_ifp);
1081 }
1082
1083 static void
1084 bstp_ifupdstatus(struct bridge_softc *sc, struct bridge_iflist *bif)
1085 {
1086 struct ifnet *ifp = bif->bif_ifp;
1087 struct ifmediareq ifmr;
1088 int error = 0;
1089
1090 bzero((char *)&ifmr, sizeof(ifmr));
1091 ifnet_serialize_all(ifp);
1092 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr, NULL);
1093 ifnet_deserialize_all(ifp);
1094
1095 if ((error == 0) && (ifp->if_flags & IFF_UP)) {
1096 if (ifmr.ifm_status & IFM_ACTIVE) {
1097 if (bif->bif_state == BSTP_IFSTATE_DISABLED)
1098 bstp_enable_port(sc, bif);
1099
1100 } else {
1101 if (bif->bif_state != BSTP_IFSTATE_DISABLED)
1102 bstp_disable_port(sc, bif);
1103 }
1104 return;
1105 }
1106
1107 if (bif->bif_state != BSTP_IFSTATE_DISABLED)
1108 bstp_disable_port(sc, bif);
1109 }
1110
1111 static void
1112 bstp_tick(void *arg)
1113 {
1114 struct bridge_softc *sc = arg;
1115 struct lwkt_msg *lmsg;
1116
1117 KKASSERT(mycpuid == BRIDGE_CFGCPU);
1118
1119 crit_enter();
1120
1121 if (callout_pending(&sc->sc_bstpcallout) ||
1122 !callout_active(&sc->sc_bstpcallout)) {
1123 crit_exit();
1124 return;
1125 }
1126 callout_deactivate(&sc->sc_bstpcallout);
1127
1128 lmsg = &sc->sc_bstptimemsg.nm_lmsg;
1129 KKASSERT(lmsg->ms_flags & MSGF_DONE);
1130 lwkt_sendmsg(BRIDGE_CFGPORT, lmsg);
1131
1132 crit_exit();
1133 }
1134
1135 void
1136 bstp_tick_handler(struct netmsg *nmsg)
1137 {
1138 struct bridge_softc *sc = nmsg->nm_lmsg.u.ms_resultp;
1139 struct bridge_iflist *bif;
1140
1141 KKASSERT(&curthread->td_msgport == BRIDGE_CFGPORT);
1142 crit_enter();
1143 /* Reply ASAP */
1144 lwkt_replymsg(&nmsg->nm_lmsg, 0);
1145 crit_exit();
1146
1147 ifnet_serialize_all(sc->sc_ifp);
1148
1149 /*
1150 * NOTE:
1151 * We don't need to worry that member iface is ripped
1152 * from the per-cpu list during the blocking operation
1153 * in the loop body, since deletion is serialized by
1154 * BRIDGE_CFGPORT
1155 */
1156
1157 LIST_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
1158 if ((bif->bif_flags & IFBIF_STP) == 0)
1159 continue;
1160 /*
1161 * XXX This can cause a lag in "link does away"
1162 * XXX and "spanning tree gets updated". We need
1163 * XXX come sort of callback from the link state
1164 * XXX update code to kick spanning tree.
1165 * XXX --thorpej@NetBSD.org
1166 */
1167 bstp_ifupdstatus(sc, bif);
1168 }
1169
1170 if (bstp_timer_expired(&sc->sc_hello_timer, sc->sc_hello_time))
1171 bstp_hello_timer_expiry(sc);
1172
1173 if (bstp_timer_expired(&sc->sc_tcn_timer, sc->sc_bridge_hello_time))
1174 bstp_tcn_timer_expiry(sc);
1175
1176 if (bstp_timer_expired(&sc->sc_topology_change_timer,
1177 sc->sc_topology_change_time))
1178 bstp_topology_change_timer_expiry(sc);
1179
1180 LIST_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
1181 if ((bif->bif_flags & IFBIF_STP) == 0)
1182 continue;
1183 if (bstp_timer_expired(&bif->bif_message_age_timer,
1184 sc->sc_max_age))
1185 bstp_message_age_timer_expiry(sc, bif);
1186 }
1187
1188 LIST_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
1189 if ((bif->bif_flags & IFBIF_STP) == 0)
1190 continue;
1191 if (bstp_timer_expired(&bif->bif_forward_delay_timer,
1192 sc->sc_forward_delay))
1193 bstp_forward_delay_timer_expiry(sc, bif);
1194
1195 if (bstp_timer_expired(&bif->bif_hold_timer,
1196 sc->sc_hold_time))
1197 bstp_hold_timer_expiry(sc, bif);
1198 }
1199
1200 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1201 callout_reset(&sc->sc_bstpcallout, hz, bstp_tick, sc);
1202
1203 ifnet_deserialize_all(sc->sc_ifp);
1204 }
1205
1206 static void
1207 bstp_timer_start(struct bridge_timer *t, uint16_t v)
1208 {
1209 t->value = v;
1210 t->active = 1;
1211 }
1212
1213 static void
1214 bstp_timer_stop(struct bridge_timer *t)
1215 {
1216 t->value = 0;
1217 t->active = 0;
1218 }
1219
1220 static int
1221 bstp_timer_expired(struct bridge_timer *t, uint16_t v)
1222 {
1223 if (t->active == 0)
1224 return (0);
1225 t->value += BSTP_TICK_VAL;
1226 if (t->value >= v) {
1227 bstp_timer_stop(t);
1228 return (1);
1229 }
1230 return (0);
1231
1232 }
DragonFly BSD