2 * Copyright (c) 2000 Jason L. Wright (jason@thought.net)
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
25 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
27 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
28 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
31 * $OpenBSD: bridgestp.c,v 1.5 2001/03/22 03:48:29 jason Exp $
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 1.4 2007/06/06 13:10:39 sephe Exp $
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)
43 #include <sys/cdefs.h>
45 #include <sys/param.h>
46 #include <sys/systm.h>
48 #include <sys/socket.h>
49 #include <sys/sockio.h>
50 #include <sys/kernel.h>
51 #include <sys/callout.h>
54 #include <sys/thread.h>
55 #include <sys/thread2.h>
58 #include <net/if_dl.h>
59 #include <net/if_types.h>
60 #include <net/if_llc.h>
61 #include <net/if_media.h>
63 #include <netinet/in.h>
64 #include <netinet/in_systm.h>
65 #include <netinet/in_var.h>
66 #include <netinet/if_ether.h>
67 #include <net/bridge/if_bridgevar.h>
69 /* BPDU message types */
70 #define BSTP_MSGTYPE_CFG 0x00 /* Configuration */
71 #define BSTP_MSGTYPE_TCN 0x80 /* Topology chg notification */
74 #define BSTP_FLAG_TC 0x01 /* Topology change */
75 #define BSTP_FLAG_TCA 0x80 /* Topology change ack */
77 #define BSTP_MESSAGE_AGE_INCR (1 * 256) /* in 256ths of a second */
78 #define BSTP_TICK_VAL (1 * 256) /* in 256ths of a second */
81 * Because BPDU's do not make nicely aligned structures, two different
82 * declarations are used: bstp_?bpdu (wire representation, packed) and
83 * bstp_*_unit (internal, nicely aligned version).
86 /* configuration bridge protocol data unit */
88 uint8_t cbu_dsap; /* LLC: destination sap */
89 uint8_t cbu_ssap; /* LLC: source sap */
90 uint8_t cbu_ctl; /* LLC: control */
91 uint16_t cbu_protoid; /* protocol id */
92 uint8_t cbu_protover; /* protocol version */
93 uint8_t cbu_bpdutype; /* message type */
94 uint8_t cbu_flags; /* flags (below) */
97 uint16_t cbu_rootpri; /* root priority */
98 uint8_t cbu_rootaddr[6]; /* root address */
100 uint32_t cbu_rootpathcost; /* root path cost */
103 uint16_t cbu_bridgepri; /* bridge priority */
104 uint8_t cbu_bridgeaddr[6]; /* bridge address */
106 uint16_t cbu_portid; /* port id */
107 uint16_t cbu_messageage; /* current message age */
108 uint16_t cbu_maxage; /* maximum age */
109 uint16_t cbu_hellotime; /* hello time */
110 uint16_t cbu_forwarddelay; /* forwarding delay */
111 } __attribute__((__packed__));
113 /* topology change notification bridge protocol data unit */
115 uint8_t tbu_dsap; /* LLC: destination sap */
116 uint8_t tbu_ssap; /* LLC: source sap */
117 uint8_t tbu_ctl; /* LLC: control */
118 uint16_t tbu_protoid; /* protocol id */
119 uint8_t tbu_protover; /* protocol version */
120 uint8_t tbu_bpdutype; /* message type */
121 } __attribute__((__packed__));
123 const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
125 static void bstp_initialize_port(struct bridge_softc *,
126 struct bridge_iflist *);
127 static void bstp_ifupdstatus(struct bridge_softc *, struct bridge_iflist *);
128 static void bstp_enable_port(struct bridge_softc *, struct bridge_iflist *);
129 static void bstp_disable_port(struct bridge_softc *,
130 struct bridge_iflist *);
132 static void bstp_enable_change_detection(struct bridge_iflist *);
133 static void bstp_disable_change_detection(struct bridge_iflist *);
135 static int bstp_root_bridge(struct bridge_softc *sc);
136 static int bstp_supersedes_port_info(struct bridge_softc *,
137 struct bridge_iflist *, struct bstp_config_unit *);
138 static int bstp_designated_port(struct bridge_softc *,
139 struct bridge_iflist *);
140 static int bstp_designated_for_some_port(struct bridge_softc *);
141 static void bstp_transmit_config(struct bridge_softc *,
142 struct bridge_iflist *);
143 static void bstp_transmit_tcn(struct bridge_softc *);
144 static void bstp_received_config_bpdu(struct bridge_softc *,
145 struct bridge_iflist *, struct bstp_config_unit *);
146 static void bstp_received_tcn_bpdu(struct bridge_softc *,
147 struct bridge_iflist *, struct bstp_tcn_unit *);
148 static void bstp_record_config_information(struct bridge_softc *,
149 struct bridge_iflist *, struct bstp_config_unit *);
150 static void bstp_record_config_timeout_values(struct bridge_softc *,
151 struct bstp_config_unit *);
152 static void bstp_config_bpdu_generation(struct bridge_softc *);
153 static void bstp_send_config_bpdu(struct bridge_softc *,
154 struct bridge_iflist *, struct bstp_config_unit *);
155 static void bstp_configuration_update(struct bridge_softc *);
156 static void bstp_root_selection(struct bridge_softc *);
157 static void bstp_designated_port_selection(struct bridge_softc *);
158 static void bstp_become_designated_port(struct bridge_softc *,
159 struct bridge_iflist *);
160 static void bstp_port_state_selection(struct bridge_softc *);
161 static void bstp_make_forwarding(struct bridge_softc *,
162 struct bridge_iflist *);
163 static void bstp_make_blocking(struct bridge_softc *,
164 struct bridge_iflist *);
165 static void bstp_set_port_state(struct bridge_iflist *, uint8_t);
167 static void bstp_set_bridge_priority(struct bridge_softc *, uint64_t);
168 static void bstp_set_port_priority(struct bridge_softc *,
169 struct bridge_iflist *, uint16_t);
170 static void bstp_set_path_cost(struct bridge_softc *,
171 struct bridge_iflist *, uint32_t);
173 static void bstp_topology_change_detection(struct bridge_softc *);
174 static void bstp_topology_change_acknowledged(struct bridge_softc *);
175 static void bstp_acknowledge_topology_change(struct bridge_softc *,
176 struct bridge_iflist *);
178 static void bstp_tick(void *);
179 static void bstp_timer_start(struct bridge_timer *, uint16_t);
180 static void bstp_timer_stop(struct bridge_timer *);
181 static int bstp_timer_expired(struct bridge_timer *, uint16_t);
183 static void bstp_hold_timer_expiry(struct bridge_softc *,
184 struct bridge_iflist *);
185 static void bstp_message_age_timer_expiry(struct bridge_softc *,
186 struct bridge_iflist *);
187 static void bstp_forward_delay_timer_expiry(struct bridge_softc *,
188 struct bridge_iflist *);
189 static void bstp_topology_change_timer_expiry(struct bridge_softc *);
190 static void bstp_tcn_timer_expiry(struct bridge_softc *);
191 static void bstp_hello_timer_expiry(struct bridge_softc *);
192 static int bstp_addr_cmp(const uint8_t *, const uint8_t *);
195 bstp_transmit_config(struct bridge_softc *sc, struct bridge_iflist *bif)
197 if (bif->bif_hold_timer.active) {
198 bif->bif_config_pending = 1;
202 bif->bif_config_bpdu.cu_message_type = BSTP_MSGTYPE_CFG;
203 bif->bif_config_bpdu.cu_rootid = sc->sc_designated_root;
204 bif->bif_config_bpdu.cu_root_path_cost = sc->sc_root_path_cost;
205 bif->bif_config_bpdu.cu_bridge_id = sc->sc_bridge_id;
206 bif->bif_config_bpdu.cu_port_id = bif->bif_port_id;
208 if (bstp_root_bridge(sc))
209 bif->bif_config_bpdu.cu_message_age = 0;
211 bif->bif_config_bpdu.cu_message_age =
212 sc->sc_root_port->bif_message_age_timer.value +
213 BSTP_MESSAGE_AGE_INCR;
215 bif->bif_config_bpdu.cu_max_age = sc->sc_max_age;
216 bif->bif_config_bpdu.cu_hello_time = sc->sc_hello_time;
217 bif->bif_config_bpdu.cu_forward_delay = sc->sc_forward_delay;
218 bif->bif_config_bpdu.cu_topology_change_acknowledgment
219 = bif->bif_topology_change_acknowledge;
220 bif->bif_config_bpdu.cu_topology_change = sc->sc_topology_change;
222 if (bif->bif_config_bpdu.cu_message_age < sc->sc_max_age) {
223 bif->bif_topology_change_acknowledge = 0;
224 bif->bif_config_pending = 0;
225 bstp_send_config_bpdu(sc, bif, &bif->bif_config_bpdu);
226 bstp_timer_start(&bif->bif_hold_timer, 0);
231 bstp_send_config_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif,
232 struct bstp_config_unit *cu)
236 struct ether_header *eh;
237 struct bstp_cbpdu bpdu;
241 if ((ifp->if_flags & IFF_RUNNING) == 0)
244 MGETHDR(m, MB_DONTWAIT, MT_DATA);
248 eh = mtod(m, struct ether_header *);
250 m->m_pkthdr.rcvif = ifp;
251 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu);
252 m->m_len = m->m_pkthdr.len;
254 bpdu.cbu_ssap = bpdu.cbu_dsap = LLC_8021D_LSAP;
255 bpdu.cbu_ctl = LLC_UI;
256 bpdu.cbu_protoid = htons(0);
257 bpdu.cbu_protover = 0;
258 bpdu.cbu_bpdutype = cu->cu_message_type;
259 bpdu.cbu_flags = (cu->cu_topology_change ? BSTP_FLAG_TC : 0) |
260 (cu->cu_topology_change_acknowledgment ? BSTP_FLAG_TCA : 0);
262 bpdu.cbu_rootpri = htons(cu->cu_rootid >> 48);
263 bpdu.cbu_rootaddr[0] = cu->cu_rootid >> 40;
264 bpdu.cbu_rootaddr[1] = cu->cu_rootid >> 32;
265 bpdu.cbu_rootaddr[2] = cu->cu_rootid >> 24;
266 bpdu.cbu_rootaddr[3] = cu->cu_rootid >> 16;
267 bpdu.cbu_rootaddr[4] = cu->cu_rootid >> 8;
268 bpdu.cbu_rootaddr[5] = cu->cu_rootid >> 0;
270 bpdu.cbu_rootpathcost = htonl(cu->cu_root_path_cost);
272 bpdu.cbu_bridgepri = htons(cu->cu_bridge_id >> 48);
273 bpdu.cbu_bridgeaddr[0] = cu->cu_bridge_id >> 40;
274 bpdu.cbu_bridgeaddr[1] = cu->cu_bridge_id >> 32;
275 bpdu.cbu_bridgeaddr[2] = cu->cu_bridge_id >> 24;
276 bpdu.cbu_bridgeaddr[3] = cu->cu_bridge_id >> 16;
277 bpdu.cbu_bridgeaddr[4] = cu->cu_bridge_id >> 8;
278 bpdu.cbu_bridgeaddr[5] = cu->cu_bridge_id >> 0;
280 bpdu.cbu_portid = htons(cu->cu_port_id);
281 bpdu.cbu_messageage = htons(cu->cu_message_age);
282 bpdu.cbu_maxage = htons(cu->cu_max_age);
283 bpdu.cbu_hellotime = htons(cu->cu_hello_time);
284 bpdu.cbu_forwarddelay = htons(cu->cu_forward_delay);
286 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
287 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
288 eh->ether_type = htons(sizeof(bpdu));
290 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu));
292 bridge_enqueue(ifp, m);
296 bstp_root_bridge(struct bridge_softc *sc)
298 return (sc->sc_designated_root == sc->sc_bridge_id);
302 bstp_supersedes_port_info(struct bridge_softc *sc, struct bridge_iflist *bif,
303 struct bstp_config_unit *cu)
305 if (cu->cu_rootid < bif->bif_designated_root)
307 if (cu->cu_rootid > bif->bif_designated_root)
310 if (cu->cu_root_path_cost < bif->bif_designated_cost)
312 if (cu->cu_root_path_cost > bif->bif_designated_cost)
315 if (cu->cu_bridge_id < bif->bif_designated_bridge)
317 if (cu->cu_bridge_id > bif->bif_designated_bridge)
320 if (sc->sc_bridge_id != cu->cu_bridge_id)
322 if (cu->cu_port_id <= bif->bif_designated_port)
328 bstp_record_config_information(struct bridge_softc *sc,
329 struct bridge_iflist *bif, struct bstp_config_unit *cu)
331 bif->bif_designated_root = cu->cu_rootid;
332 bif->bif_designated_cost = cu->cu_root_path_cost;
333 bif->bif_designated_bridge = cu->cu_bridge_id;
334 bif->bif_designated_port = cu->cu_port_id;
335 bstp_timer_start(&bif->bif_message_age_timer, cu->cu_message_age);
339 bstp_record_config_timeout_values(struct bridge_softc *sc,
340 struct bstp_config_unit *config)
342 sc->sc_max_age = config->cu_max_age;
343 sc->sc_hello_time = config->cu_hello_time;
344 sc->sc_forward_delay = config->cu_forward_delay;
345 sc->sc_topology_change = config->cu_topology_change;
349 bstp_config_bpdu_generation(struct bridge_softc *sc)
351 struct bridge_iflist *bif;
353 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
354 if ((bif->bif_flags & IFBIF_STP) == 0)
356 if (bstp_designated_port(sc, bif) &&
357 (bif->bif_state != BSTP_IFSTATE_DISABLED))
358 bstp_transmit_config(sc, bif);
363 bstp_designated_port(struct bridge_softc *sc, struct bridge_iflist *bif)
365 return ((bif->bif_designated_bridge == sc->sc_bridge_id)
366 && (bif->bif_designated_port == bif->bif_port_id));
370 bstp_transmit_tcn(struct bridge_softc *sc)
372 struct bstp_tbpdu bpdu;
373 struct bridge_iflist *bif = sc->sc_root_port;
374 struct ifnet *ifp = bif->bif_ifp;
375 struct ether_header *eh;
378 if ((ifp->if_flags & IFF_RUNNING) == 0)
381 MGETHDR(m, MB_DONTWAIT, MT_DATA);
385 m->m_pkthdr.rcvif = ifp;
386 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu);
387 m->m_len = m->m_pkthdr.len;
389 eh = mtod(m, struct ether_header *);
391 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
392 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
393 eh->ether_type = htons(sizeof(bpdu));
395 bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP;
396 bpdu.tbu_ctl = LLC_UI;
397 bpdu.tbu_protoid = 0;
398 bpdu.tbu_protover = 0;
399 bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN;
401 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu));
403 bridge_enqueue(ifp, m);
407 bstp_configuration_update(struct bridge_softc *sc)
409 bstp_root_selection(sc);
410 bstp_designated_port_selection(sc);
414 bstp_root_selection(struct bridge_softc *sc)
416 struct bridge_iflist *root_port = NULL, *bif;
418 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
419 if ((bif->bif_flags & IFBIF_STP) == 0)
421 if (bstp_designated_port(sc, bif))
423 if (bif->bif_state == BSTP_IFSTATE_DISABLED)
425 if (bif->bif_designated_root >= sc->sc_bridge_id)
427 if (root_port == NULL)
430 if (bif->bif_designated_root < root_port->bif_designated_root)
432 if (bif->bif_designated_root > root_port->bif_designated_root)
435 if ((bif->bif_designated_cost + bif->bif_path_cost) <
436 (root_port->bif_designated_cost + root_port->bif_path_cost))
438 if ((bif->bif_designated_cost + bif->bif_path_cost) >
439 (root_port->bif_designated_cost + root_port->bif_path_cost))
442 if (bif->bif_designated_bridge <
443 root_port->bif_designated_bridge)
445 if (bif->bif_designated_bridge >
446 root_port->bif_designated_bridge)
449 if (bif->bif_designated_port < root_port->bif_designated_port)
451 if (bif->bif_designated_port > root_port->bif_designated_port)
454 if (bif->bif_port_id >= root_port->bif_port_id)
460 sc->sc_root_port = root_port;
461 if (root_port == NULL) {
462 sc->sc_designated_root = sc->sc_bridge_id;
463 sc->sc_root_path_cost = 0;
465 sc->sc_designated_root = root_port->bif_designated_root;
466 sc->sc_root_path_cost = root_port->bif_designated_cost +
467 root_port->bif_path_cost;
472 bstp_designated_port_selection(struct bridge_softc *sc)
474 struct bridge_iflist *bif;
476 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
477 if ((bif->bif_flags & IFBIF_STP) == 0)
479 if (bstp_designated_port(sc, bif))
481 if (bif->bif_designated_root != sc->sc_designated_root)
484 if (sc->sc_root_path_cost < bif->bif_designated_cost)
486 if (sc->sc_root_path_cost > bif->bif_designated_cost)
489 if (sc->sc_bridge_id < bif->bif_designated_bridge)
491 if (sc->sc_bridge_id > bif->bif_designated_bridge)
494 if (bif->bif_port_id > bif->bif_designated_port)
497 bstp_become_designated_port(sc, bif);
502 bstp_become_designated_port(struct bridge_softc *sc, struct bridge_iflist *bif)
504 bif->bif_designated_root = sc->sc_designated_root;
505 bif->bif_designated_cost = sc->sc_root_path_cost;
506 bif->bif_designated_bridge = sc->sc_bridge_id;
507 bif->bif_designated_port = bif->bif_port_id;
511 bstp_port_state_selection(struct bridge_softc *sc)
513 struct bridge_iflist *bif;
515 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
516 if ((bif->bif_flags & IFBIF_STP) == 0)
518 if (bif == sc->sc_root_port) {
519 bif->bif_config_pending = 0;
520 bif->bif_topology_change_acknowledge = 0;
521 bstp_make_forwarding(sc, bif);
522 } else if (bstp_designated_port(sc, bif)) {
523 bstp_timer_stop(&bif->bif_message_age_timer);
524 bstp_make_forwarding(sc, bif);
526 bif->bif_config_pending = 0;
527 bif->bif_topology_change_acknowledge = 0;
528 bstp_make_blocking(sc, bif);
534 bstp_make_forwarding(struct bridge_softc *sc, struct bridge_iflist *bif)
536 if (bif->bif_state == BSTP_IFSTATE_BLOCKING) {
537 bstp_set_port_state(bif, BSTP_IFSTATE_LISTENING);
538 bstp_timer_start(&bif->bif_forward_delay_timer, 0);
543 bstp_make_blocking(struct bridge_softc *sc, struct bridge_iflist *bif)
545 if ((bif->bif_state != BSTP_IFSTATE_DISABLED) &&
546 (bif->bif_state != BSTP_IFSTATE_BLOCKING)) {
547 if ((bif->bif_state == BSTP_IFSTATE_FORWARDING) ||
548 (bif->bif_state == BSTP_IFSTATE_LEARNING)) {
549 if (bif->bif_change_detection_enabled) {
550 bstp_topology_change_detection(sc);
553 bstp_set_port_state(bif, BSTP_IFSTATE_BLOCKING);
554 bridge_rtdelete(sc, bif->bif_ifp, IFBF_FLUSHDYN);
555 bstp_timer_stop(&bif->bif_forward_delay_timer);
560 bstp_set_port_state(struct bridge_iflist *bif, uint8_t state)
562 bif->bif_state = state;
566 bstp_topology_change_detection(struct bridge_softc *sc)
568 if (bstp_root_bridge(sc)) {
569 sc->sc_topology_change = 1;
570 bstp_timer_start(&sc->sc_topology_change_timer, 0);
571 } else if (!sc->sc_topology_change_detected) {
572 bstp_transmit_tcn(sc);
573 bstp_timer_start(&sc->sc_tcn_timer, 0);
575 sc->sc_topology_change_detected = 1;
579 bstp_topology_change_acknowledged(struct bridge_softc *sc)
581 sc->sc_topology_change_detected = 0;
582 bstp_timer_stop(&sc->sc_tcn_timer);
586 bstp_acknowledge_topology_change(struct bridge_softc *sc,
587 struct bridge_iflist *bif)
589 bif->bif_topology_change_acknowledge = 1;
590 bstp_transmit_config(sc, bif);
594 bstp_input(struct ifnet *ifp, struct mbuf *m)
596 struct bridge_softc *sc = ifp->if_bridge;
597 struct bridge_iflist *bif = NULL;
598 struct ether_header *eh;
599 struct bstp_tbpdu tpdu;
600 struct bstp_cbpdu cpdu;
601 struct bstp_config_unit cu;
602 struct bstp_tcn_unit tu;
605 eh = mtod(m, struct ether_header *);
607 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
608 if ((bif->bif_flags & IFBIF_STP) == 0)
610 if (bif->bif_ifp == ifp)
616 len = ntohs(eh->ether_type);
617 if (len < sizeof(tpdu))
620 m_adj(m, ETHER_HDR_LEN);
622 if (m->m_pkthdr.len > len)
623 m_adj(m, len - m->m_pkthdr.len);
624 if (m->m_len < sizeof(tpdu) &&
625 (m = m_pullup(m, sizeof(tpdu))) == NULL)
628 memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu));
630 if (tpdu.tbu_dsap != LLC_8021D_LSAP ||
631 tpdu.tbu_ssap != LLC_8021D_LSAP ||
632 tpdu.tbu_ctl != LLC_UI)
634 if (tpdu.tbu_protoid != 0 || tpdu.tbu_protover != 0)
637 switch (tpdu.tbu_bpdutype) {
638 case BSTP_MSGTYPE_TCN:
639 tu.tu_message_type = tpdu.tbu_bpdutype;
640 bstp_received_tcn_bpdu(sc, bif, &tu);
642 case BSTP_MSGTYPE_CFG:
643 if (m->m_len < sizeof(cpdu) &&
644 (m = m_pullup(m, sizeof(cpdu))) == NULL)
646 memcpy(&cpdu, mtod(m, caddr_t), sizeof(cpdu));
649 (((uint64_t)ntohs(cpdu.cbu_rootpri)) << 48) |
650 (((uint64_t)cpdu.cbu_rootaddr[0]) << 40) |
651 (((uint64_t)cpdu.cbu_rootaddr[1]) << 32) |
652 (((uint64_t)cpdu.cbu_rootaddr[2]) << 24) |
653 (((uint64_t)cpdu.cbu_rootaddr[3]) << 16) |
654 (((uint64_t)cpdu.cbu_rootaddr[4]) << 8) |
655 (((uint64_t)cpdu.cbu_rootaddr[5]) << 0);
658 (((uint64_t)ntohs(cpdu.cbu_bridgepri)) << 48) |
659 (((uint64_t)cpdu.cbu_bridgeaddr[0]) << 40) |
660 (((uint64_t)cpdu.cbu_bridgeaddr[1]) << 32) |
661 (((uint64_t)cpdu.cbu_bridgeaddr[2]) << 24) |
662 (((uint64_t)cpdu.cbu_bridgeaddr[3]) << 16) |
663 (((uint64_t)cpdu.cbu_bridgeaddr[4]) << 8) |
664 (((uint64_t)cpdu.cbu_bridgeaddr[5]) << 0);
666 cu.cu_root_path_cost = ntohl(cpdu.cbu_rootpathcost);
667 cu.cu_message_age = ntohs(cpdu.cbu_messageage);
668 cu.cu_max_age = ntohs(cpdu.cbu_maxage);
669 cu.cu_hello_time = ntohs(cpdu.cbu_hellotime);
670 cu.cu_forward_delay = ntohs(cpdu.cbu_forwarddelay);
671 cu.cu_port_id = ntohs(cpdu.cbu_portid);
672 cu.cu_message_type = cpdu.cbu_bpdutype;
673 cu.cu_topology_change_acknowledgment =
674 (cpdu.cbu_flags & BSTP_FLAG_TCA) ? 1 : 0;
675 cu.cu_topology_change =
676 (cpdu.cbu_flags & BSTP_FLAG_TC) ? 1 : 0;
677 bstp_received_config_bpdu(sc, bif, &cu);
690 bstp_received_config_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif,
691 struct bstp_config_unit *cu)
695 root = bstp_root_bridge(sc);
697 if (bif->bif_state != BSTP_IFSTATE_DISABLED) {
698 if (bstp_supersedes_port_info(sc, bif, cu)) {
699 bstp_record_config_information(sc, bif, cu);
700 bstp_configuration_update(sc);
701 bstp_port_state_selection(sc);
703 if ((bstp_root_bridge(sc) == 0) && root) {
704 bstp_timer_stop(&sc->sc_hello_timer);
706 if (sc->sc_topology_change_detected) {
708 &sc->sc_topology_change_timer);
709 bstp_transmit_tcn(sc);
710 bstp_timer_start(&sc->sc_tcn_timer, 0);
714 if (bif == sc->sc_root_port) {
715 bstp_record_config_timeout_values(sc, cu);
716 bstp_config_bpdu_generation(sc);
718 if (cu->cu_topology_change_acknowledgment)
719 bstp_topology_change_acknowledged(sc);
721 } else if (bstp_designated_port(sc, bif))
722 bstp_transmit_config(sc, bif);
727 bstp_received_tcn_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif,
728 struct bstp_tcn_unit *tcn)
730 if (bif->bif_state != BSTP_IFSTATE_DISABLED &&
731 bstp_designated_port(sc, bif)) {
732 bstp_topology_change_detection(sc);
733 bstp_acknowledge_topology_change(sc, bif);
738 bstp_hello_timer_expiry(struct bridge_softc *sc)
740 bstp_config_bpdu_generation(sc);
741 bstp_timer_start(&sc->sc_hello_timer, 0);
745 bstp_message_age_timer_expiry(struct bridge_softc *sc,
746 struct bridge_iflist *bif)
750 root = bstp_root_bridge(sc);
751 bstp_become_designated_port(sc, bif);
752 bstp_configuration_update(sc);
753 bstp_port_state_selection(sc);
755 if ((bstp_root_bridge(sc)) && (root == 0)) {
756 sc->sc_max_age = sc->sc_bridge_max_age;
757 sc->sc_hello_time = sc->sc_bridge_hello_time;
758 sc->sc_forward_delay = sc->sc_bridge_forward_delay;
760 bstp_topology_change_detection(sc);
761 bstp_timer_stop(&sc->sc_tcn_timer);
762 bstp_config_bpdu_generation(sc);
763 bstp_timer_start(&sc->sc_hello_timer, 0);
768 bstp_forward_delay_timer_expiry(struct bridge_softc *sc,
769 struct bridge_iflist *bif)
771 if (bif->bif_state == BSTP_IFSTATE_LISTENING) {
772 bstp_set_port_state(bif, BSTP_IFSTATE_LEARNING);
773 bstp_timer_start(&bif->bif_forward_delay_timer, 0);
774 } else if (bif->bif_state == BSTP_IFSTATE_LEARNING) {
775 bstp_set_port_state(bif, BSTP_IFSTATE_FORWARDING);
776 if (bstp_designated_for_some_port(sc) &&
777 bif->bif_change_detection_enabled)
778 bstp_topology_change_detection(sc);
783 bstp_designated_for_some_port(struct bridge_softc *sc)
786 struct bridge_iflist *bif;
788 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
789 if ((bif->bif_flags & IFBIF_STP) == 0)
791 if (bif->bif_designated_bridge == sc->sc_bridge_id)
798 bstp_tcn_timer_expiry(struct bridge_softc *sc)
800 bstp_transmit_tcn(sc);
801 bstp_timer_start(&sc->sc_tcn_timer, 0);
805 bstp_topology_change_timer_expiry(struct bridge_softc *sc)
807 sc->sc_topology_change_detected = 0;
808 sc->sc_topology_change = 0;
812 bstp_hold_timer_expiry(struct bridge_softc *sc, struct bridge_iflist *bif)
814 if (bif->bif_config_pending)
815 bstp_transmit_config(sc, bif);
819 bstp_addr_cmp(const uint8_t *a, const uint8_t *b)
823 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
824 d = ((int)a[i]) - ((int)b[i]);
831 bstp_initialization(struct bridge_softc *sc)
833 struct bridge_iflist *bif, *mif;
837 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
838 if ((bif->bif_flags & IFBIF_STP) == 0)
840 if (bif->bif_ifp->if_type != IFT_ETHER)
842 bif->bif_port_id = (bif->bif_priority << 8) |
843 (bif->bif_ifp->if_index & 0xff);
849 if (bstp_addr_cmp(IF_LLADDR(bif->bif_ifp),
850 IF_LLADDR(mif->bif_ifp)) < 0) {
860 e_addr = IF_LLADDR(mif->bif_ifp);
862 (((uint64_t)sc->sc_bridge_priority) << 48) |
863 (((uint64_t)e_addr[0]) << 40) |
864 (((uint64_t)e_addr[1]) << 32) |
865 (((uint64_t)e_addr[2]) << 24) |
866 (((uint64_t)e_addr[3]) << 16) |
867 (((uint64_t)e_addr[4]) << 8) |
868 (((uint64_t)e_addr[5]));
870 sc->sc_designated_root = sc->sc_bridge_id;
871 sc->sc_root_path_cost = 0;
872 sc->sc_root_port = NULL;
874 sc->sc_max_age = sc->sc_bridge_max_age;
875 sc->sc_hello_time = sc->sc_bridge_hello_time;
876 sc->sc_forward_delay = sc->sc_bridge_forward_delay;
877 sc->sc_topology_change_detected = 0;
878 sc->sc_topology_change = 0;
879 bstp_timer_stop(&sc->sc_tcn_timer);
880 bstp_timer_stop(&sc->sc_topology_change_timer);
882 if (callout_pending(&sc->sc_bstpcallout) == 0)
883 callout_reset(&sc->sc_bstpcallout, hz,
886 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
887 if (bif->bif_flags & IFBIF_STP)
888 bstp_ifupdstatus(sc, bif);
890 bstp_disable_port(sc, bif);
893 bstp_port_state_selection(sc);
894 bstp_config_bpdu_generation(sc);
895 bstp_timer_start(&sc->sc_hello_timer, 0);
899 bstp_stop(struct bridge_softc *sc)
901 struct bridge_iflist *bif;
903 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
904 bstp_set_port_state(bif, BSTP_IFSTATE_DISABLED);
905 bstp_timer_stop(&bif->bif_hold_timer);
906 bstp_timer_stop(&bif->bif_message_age_timer);
907 bstp_timer_stop(&bif->bif_forward_delay_timer);
910 callout_stop(&sc->sc_bstpcallout);
912 bstp_timer_stop(&sc->sc_topology_change_timer);
913 bstp_timer_stop(&sc->sc_tcn_timer);
914 bstp_timer_stop(&sc->sc_hello_timer);
919 bstp_initialize_port(struct bridge_softc *sc, struct bridge_iflist *bif)
921 bstp_become_designated_port(sc, bif);
922 bstp_set_port_state(bif, BSTP_IFSTATE_BLOCKING);
923 bif->bif_topology_change_acknowledge = 0;
924 bif->bif_config_pending = 0;
925 bif->bif_change_detection_enabled = 1;
926 bstp_timer_stop(&bif->bif_message_age_timer);
927 bstp_timer_stop(&bif->bif_forward_delay_timer);
928 bstp_timer_stop(&bif->bif_hold_timer);
932 bstp_enable_port(struct bridge_softc *sc, struct bridge_iflist *bif)
934 bstp_initialize_port(sc, bif);
935 bstp_port_state_selection(sc);
939 bstp_disable_port(struct bridge_softc *sc, struct bridge_iflist *bif)
943 root = bstp_root_bridge(sc);
944 bstp_become_designated_port(sc, bif);
945 bstp_set_port_state(bif, BSTP_IFSTATE_DISABLED);
946 bif->bif_topology_change_acknowledge = 0;
947 bif->bif_config_pending = 0;
948 bstp_timer_stop(&bif->bif_message_age_timer);
949 bstp_timer_stop(&bif->bif_forward_delay_timer);
950 bstp_configuration_update(sc);
951 bstp_port_state_selection(sc);
952 bridge_rtdelete(sc, bif->bif_ifp, IFBF_FLUSHDYN);
954 if (bstp_root_bridge(sc) && (root == 0)) {
955 sc->sc_max_age = sc->sc_bridge_max_age;
956 sc->sc_hello_time = sc->sc_bridge_hello_time;
957 sc->sc_forward_delay = sc->sc_bridge_forward_delay;
959 bstp_topology_change_detection(sc);
960 bstp_timer_stop(&sc->sc_tcn_timer);
961 bstp_config_bpdu_generation(sc);
962 bstp_timer_start(&sc->sc_hello_timer, 0);
968 bstp_set_bridge_priority(struct bridge_softc *sc, uint64_t new_bridge_id)
970 struct bridge_iflist *bif;
973 root = bstp_root_bridge(sc);
975 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
976 if ((bif->bif_flags & IFBIF_STP) == 0)
978 if (bstp_designated_port(sc, bif))
979 bif->bif_designated_bridge = new_bridge_id;
982 sc->sc_bridge_id = new_bridge_id;
984 bstp_configuration_update(sc);
985 bstp_port_state_selection(sc);
987 if (bstp_root_bridge(sc) && (root == 0)) {
988 sc->sc_max_age = sc->sc_bridge_max_age;
989 sc->sc_hello_time = sc->sc_bridge_hello_time;
990 sc->sc_forward_delay = sc->sc_bridge_forward_delay;
992 bstp_topology_change_detection(sc);
993 bstp_timer_stop(&sc->sc_tcn_timer);
994 bstp_config_bpdu_generation(sc);
995 bstp_timer_start(&sc->sc_hello_timer, 0);
1000 bstp_set_port_priority(struct bridge_softc *sc, struct bridge_iflist *bif,
1001 uint16_t new_port_id)
1003 if (bstp_designated_port(sc, bif))
1004 bif->bif_designated_port = new_port_id;
1006 bif->bif_port_id = new_port_id;
1008 if ((sc->sc_bridge_id == bif->bif_designated_bridge) &&
1009 (bif->bif_port_id < bif->bif_designated_port)) {
1010 bstp_become_designated_port(sc, bif);
1011 bstp_port_state_selection(sc);
1016 bstp_set_path_cost(struct bridge_softc *sc, struct bridge_iflist *bif,
1019 bif->bif_path_cost = path_cost;
1020 bstp_configuration_update(sc);
1021 bstp_port_state_selection(sc);
1025 bstp_enable_change_detection(struct bridge_iflist *bif)
1027 bif->bif_change_detection_enabled = 1;
1031 bstp_disable_change_detection(struct bridge_iflist *bif)
1033 bif->bif_change_detection_enabled = 0;
1035 #endif /* notused */
1038 bstp_linkstate(struct ifnet *ifp, int state)
1040 struct bridge_softc *sc;
1041 struct bridge_iflist *bif;
1043 sc = ifp->if_bridge;
1044 lwkt_serialize_enter(sc->sc_ifp->if_serializer);
1046 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1047 if ((bif->bif_flags & IFBIF_STP) == 0)
1050 if (bif->bif_ifp == ifp) {
1051 bstp_ifupdstatus(sc, bif);
1055 lwkt_serialize_exit(sc->sc_ifp->if_serializer);
1059 bstp_ifupdstatus(struct bridge_softc *sc, struct bridge_iflist *bif)
1061 struct ifnet *ifp = bif->bif_ifp;
1062 struct ifmediareq ifmr;
1065 bzero((char *)&ifmr, sizeof(ifmr));
1066 lwkt_serialize_enter(ifp->if_serializer);
1067 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr, NULL);
1068 lwkt_serialize_exit(ifp->if_serializer);
1070 if ((error == 0) && (ifp->if_flags & IFF_UP)) {
1071 if (ifmr.ifm_status & IFM_ACTIVE) {
1072 if (bif->bif_state == BSTP_IFSTATE_DISABLED)
1073 bstp_enable_port(sc, bif);
1076 if (bif->bif_state != BSTP_IFSTATE_DISABLED)
1077 bstp_disable_port(sc, bif);
1082 if (bif->bif_state != BSTP_IFSTATE_DISABLED)
1083 bstp_disable_port(sc, bif);
1087 bstp_tick(void *arg)
1089 struct bridge_softc *sc = arg;
1090 struct bridge_iflist *bif;
1092 lwkt_serialize_enter(sc->sc_ifp->if_serializer);
1094 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1095 if ((bif->bif_flags & IFBIF_STP) == 0)
1098 * XXX This can cause a lag in "link does away"
1099 * XXX and "spanning tree gets updated". We need
1100 * XXX come sort of callback from the link state
1101 * XXX update code to kick spanning tree.
1102 * XXX --thorpej@NetBSD.org
1104 bstp_ifupdstatus(sc, bif);
1107 if (bstp_timer_expired(&sc->sc_hello_timer, sc->sc_hello_time))
1108 bstp_hello_timer_expiry(sc);
1110 if (bstp_timer_expired(&sc->sc_tcn_timer, sc->sc_bridge_hello_time))
1111 bstp_tcn_timer_expiry(sc);
1113 if (bstp_timer_expired(&sc->sc_topology_change_timer,
1114 sc->sc_topology_change_time))
1115 bstp_topology_change_timer_expiry(sc);
1117 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1118 if ((bif->bif_flags & IFBIF_STP) == 0)
1120 if (bstp_timer_expired(&bif->bif_message_age_timer,
1122 bstp_message_age_timer_expiry(sc, bif);
1125 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1126 if ((bif->bif_flags & IFBIF_STP) == 0)
1128 if (bstp_timer_expired(&bif->bif_forward_delay_timer,
1129 sc->sc_forward_delay))
1130 bstp_forward_delay_timer_expiry(sc, bif);
1132 if (bstp_timer_expired(&bif->bif_hold_timer,
1134 bstp_hold_timer_expiry(sc, bif);
1137 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1138 callout_reset(&sc->sc_bstpcallout, hz, bstp_tick, sc);
1140 lwkt_serialize_exit(sc->sc_ifp->if_serializer);
1144 bstp_timer_start(struct bridge_timer *t, uint16_t v)
1151 bstp_timer_stop(struct bridge_timer *t)
1158 bstp_timer_expired(struct bridge_timer *t, uint16_t v)
1162 t->value += BSTP_TICK_VAL;
1163 if (t->value >= v) {