1 | /* $NetBSD: bridgestp.c,v 1.23 2016/06/10 13:27:15 ozaki-r Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 2000 Jason L. Wright (jason@thought.net) |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * 3. All advertising materials mentioning features or use of this software |
16 | * must display the following acknowledgement: |
17 | * This product includes software developed by Jason L. Wright |
18 | * 4. The name of the author may not be used to endorse or promote products |
19 | * derived from this software without specific prior written permission. |
20 | * |
21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
22 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
23 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
24 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
25 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
26 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
27 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
29 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
30 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
31 | * POSSIBILITY OF SUCH DAMAGE. |
32 | * |
33 | * OpenBSD: bridgestp.c,v 1.5 2001/03/22 03:48:29 jason Exp |
34 | */ |
35 | |
36 | /* |
37 | * Implementation of the spanning tree protocol as defined in |
38 | * ISO/IEC Final DIS 15802-3 (IEEE P802.1D/D17), May 25, 1998. |
39 | * (In English: IEEE 802.1D, Draft 17, 1998) |
40 | */ |
41 | |
42 | #include <sys/cdefs.h> |
43 | __KERNEL_RCSID(0, "$NetBSD: bridgestp.c,v 1.23 2016/06/10 13:27:15 ozaki-r Exp $" ); |
44 | |
45 | #include <sys/param.h> |
46 | #include <sys/systm.h> |
47 | #include <sys/mbuf.h> |
48 | #include <sys/socket.h> |
49 | #include <sys/ioctl.h> |
50 | #include <sys/device.h> |
51 | #include <sys/kernel.h> |
52 | #include <sys/callout.h> |
53 | |
54 | #include <net/if.h> |
55 | #include <net/if_dl.h> |
56 | #include <net/if_types.h> |
57 | #include <net/if_llc.h> |
58 | |
59 | #include <net/if_ether.h> |
60 | #include <net/if_bridgevar.h> |
61 | |
62 | /* BPDU message types */ |
63 | #define BSTP_MSGTYPE_CFG 0x00 /* Configuration */ |
64 | #define BSTP_MSGTYPE_TCN 0x80 /* Topology chg notification */ |
65 | |
66 | /* BPDU flags */ |
67 | #define BSTP_FLAG_TC 0x01 /* Topology change */ |
68 | #define BSTP_FLAG_TCA 0x80 /* Topology change ack */ |
69 | |
70 | #define BSTP_MESSAGE_AGE_INCR (1 * 256) /* in 256ths of a second */ |
71 | #define BSTP_TICK_VAL (1 * 256) /* in 256ths of a second */ |
72 | |
73 | /* |
74 | * Because BPDU's do not make nicely aligned structures, two different |
75 | * declarations are used: bstp_?bpdu (wire representation, packed) and |
76 | * bstp_*_unit (internal, nicely aligned version). |
77 | */ |
78 | |
79 | /* configuration bridge protocol data unit */ |
80 | struct bstp_cbpdu { |
81 | uint8_t cbu_dsap; /* LLC: destination sap */ |
82 | uint8_t cbu_ssap; /* LLC: source sap */ |
83 | uint8_t cbu_ctl; /* LLC: control */ |
84 | uint16_t cbu_protoid; /* protocol id */ |
85 | uint8_t cbu_protover; /* protocol version */ |
86 | uint8_t cbu_bpdutype; /* message type */ |
87 | uint8_t cbu_flags; /* flags (below) */ |
88 | |
89 | /* root id */ |
90 | uint16_t cbu_rootpri; /* root priority */ |
91 | uint8_t cbu_rootaddr[6]; /* root address */ |
92 | |
93 | uint32_t cbu_rootpathcost; /* root path cost */ |
94 | |
95 | /* bridge id */ |
96 | uint16_t cbu_bridgepri; /* bridge priority */ |
97 | uint8_t cbu_bridgeaddr[6]; /* bridge address */ |
98 | |
99 | uint16_t cbu_portid; /* port id */ |
100 | uint16_t cbu_messageage; /* current message age */ |
101 | uint16_t cbu_maxage; /* maximum age */ |
102 | uint16_t cbu_hellotime; /* hello time */ |
103 | uint16_t cbu_forwarddelay; /* forwarding delay */ |
104 | } __packed; |
105 | |
106 | /* topology change notification bridge protocol data unit */ |
107 | struct bstp_tbpdu { |
108 | uint8_t tbu_dsap; /* LLC: destination sap */ |
109 | uint8_t tbu_ssap; /* LLC: source sap */ |
110 | uint8_t tbu_ctl; /* LLC: control */ |
111 | uint16_t tbu_protoid; /* protocol id */ |
112 | uint8_t tbu_protover; /* protocol version */ |
113 | uint8_t tbu_bpdutype; /* message type */ |
114 | } __packed; |
115 | |
116 | const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; |
117 | |
118 | static void bstp_initialize_port(struct bridge_softc *, struct bridge_iflist *); |
119 | static void bstp_ifupdstatus(struct bridge_softc *, struct bridge_iflist *); |
120 | static void bstp_enable_port(struct bridge_softc *, struct bridge_iflist *); |
121 | static void bstp_disable_port(struct bridge_softc *, struct bridge_iflist *); |
122 | static int bstp_root_bridge(struct bridge_softc *sc); |
123 | static int bstp_supersedes_port_info(struct bridge_softc *, |
124 | struct bridge_iflist *, |
125 | struct bstp_config_unit *); |
126 | static int bstp_designated_port(struct bridge_softc *, struct bridge_iflist *); |
127 | static int bstp_designated_for_some_port(struct bridge_softc *); |
128 | static void bstp_transmit_config(struct bridge_softc *, struct bridge_iflist *); |
129 | static void bstp_transmit_tcn(struct bridge_softc *); |
130 | static void bstp_received_config_bpdu(struct bridge_softc *, |
131 | struct bridge_iflist *, |
132 | struct bstp_config_unit *); |
133 | static void bstp_received_tcn_bpdu(struct bridge_softc *, struct bridge_iflist *, |
134 | struct bstp_tcn_unit *); |
135 | static void bstp_record_config_information(struct bridge_softc *, |
136 | struct bridge_iflist *, |
137 | struct bstp_config_unit *); |
138 | static void bstp_record_config_timeout_values(struct bridge_softc *, |
139 | struct bstp_config_unit *); |
140 | static void bstp_config_bpdu_generation(struct bridge_softc *); |
141 | static void bstp_send_config_bpdu(struct bridge_softc *, struct bridge_iflist *, |
142 | struct bstp_config_unit *); |
143 | static void bstp_configuration_update(struct bridge_softc *); |
144 | static void bstp_root_selection(struct bridge_softc *); |
145 | static void bstp_designated_port_selection(struct bridge_softc *); |
146 | static void bstp_become_designated_port(struct bridge_softc *, |
147 | struct bridge_iflist *); |
148 | static void bstp_port_state_selection(struct bridge_softc *); |
149 | static void bstp_make_forwarding(struct bridge_softc *, struct bridge_iflist *); |
150 | static void bstp_make_blocking(struct bridge_softc *, struct bridge_iflist *); |
151 | static void bstp_set_port_state(struct bridge_iflist *, uint8_t); |
152 | #if notused |
153 | static void bstp_set_bridge_priority(struct bridge_softc *, uint64_t); |
154 | static void bstp_set_port_priority(struct bridge_softc *, struct bridge_iflist *, |
155 | uint16_t); |
156 | static void bstp_set_path_cost(struct bridge_softc *, struct bridge_iflist *, |
157 | uint32_t); |
158 | #endif |
159 | static void bstp_topology_change_detection(struct bridge_softc *); |
160 | static void bstp_topology_change_acknowledged(struct bridge_softc *); |
161 | static void bstp_acknowledge_topology_change(struct bridge_softc *, |
162 | struct bridge_iflist *); |
163 | |
164 | static void bstp_tick(void *); |
165 | static void bstp_timer_start(struct bridge_timer *, uint16_t); |
166 | static void bstp_timer_stop(struct bridge_timer *); |
167 | static int bstp_timer_expired(struct bridge_timer *, uint16_t); |
168 | |
169 | static void bstp_hold_timer_expiry(struct bridge_softc *, struct bridge_iflist *); |
170 | static void bstp_message_age_timer_expiry(struct bridge_softc *, |
171 | struct bridge_iflist *); |
172 | static void bstp_forward_delay_timer_expiry(struct bridge_softc *, |
173 | struct bridge_iflist *); |
174 | static void bstp_topology_change_timer_expiry(struct bridge_softc *); |
175 | static void bstp_tcn_timer_expiry(struct bridge_softc *); |
176 | static void bstp_hello_timer_expiry(struct bridge_softc *); |
177 | |
178 | static void |
179 | bstp_transmit_config(struct bridge_softc *sc, struct bridge_iflist *bif) |
180 | { |
181 | if (bif->bif_hold_timer.active) { |
182 | bif->bif_config_pending = 1; |
183 | return; |
184 | } |
185 | |
186 | bif->bif_config_bpdu.cu_message_type = BSTP_MSGTYPE_CFG; |
187 | bif->bif_config_bpdu.cu_rootid = sc->sc_designated_root; |
188 | bif->bif_config_bpdu.cu_root_path_cost = sc->sc_root_path_cost; |
189 | bif->bif_config_bpdu.cu_bridge_id = sc->sc_bridge_id; |
190 | bif->bif_config_bpdu.cu_port_id = bif->bif_port_id; |
191 | |
192 | if (bstp_root_bridge(sc)) |
193 | bif->bif_config_bpdu.cu_message_age = 0; |
194 | else |
195 | bif->bif_config_bpdu.cu_message_age = |
196 | sc->sc_root_port->bif_message_age_timer.value + |
197 | BSTP_MESSAGE_AGE_INCR; |
198 | |
199 | bif->bif_config_bpdu.cu_max_age = sc->sc_max_age; |
200 | bif->bif_config_bpdu.cu_hello_time = sc->sc_hello_time; |
201 | bif->bif_config_bpdu.cu_forward_delay = sc->sc_forward_delay; |
202 | bif->bif_config_bpdu.cu_topology_change_acknowledgment |
203 | = bif->bif_topology_change_acknowledge; |
204 | bif->bif_config_bpdu.cu_topology_change = sc->sc_topology_change; |
205 | |
206 | if (bif->bif_config_bpdu.cu_message_age < sc->sc_max_age) { |
207 | bif->bif_topology_change_acknowledge = 0; |
208 | bif->bif_config_pending = 0; |
209 | bstp_send_config_bpdu(sc, bif, &bif->bif_config_bpdu); |
210 | bstp_timer_start(&bif->bif_hold_timer, 0); |
211 | } |
212 | } |
213 | |
214 | static void |
215 | bstp_send_config_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif, |
216 | struct bstp_config_unit *cu) |
217 | { |
218 | struct ifnet *ifp; |
219 | struct mbuf *m; |
220 | struct ether_header *eh; |
221 | struct bstp_cbpdu bpdu; |
222 | int s; |
223 | |
224 | KASSERT(BRIDGE_LOCKED(sc)); |
225 | |
226 | ifp = bif->bif_ifp; |
227 | |
228 | if ((ifp->if_flags & IFF_RUNNING) == 0) |
229 | return; |
230 | |
231 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
232 | if (m == NULL) |
233 | return; |
234 | |
235 | eh = mtod(m, struct ether_header *); |
236 | |
237 | m_set_rcvif(m, ifp); |
238 | m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); |
239 | m->m_len = m->m_pkthdr.len; |
240 | |
241 | bpdu.cbu_ssap = bpdu.cbu_dsap = LLC_8021D_LSAP; |
242 | bpdu.cbu_ctl = LLC_UI; |
243 | bpdu.cbu_protoid = htons(0); |
244 | bpdu.cbu_protover = 0; |
245 | bpdu.cbu_bpdutype = cu->cu_message_type; |
246 | bpdu.cbu_flags = (cu->cu_topology_change ? BSTP_FLAG_TC : 0) | |
247 | (cu->cu_topology_change_acknowledgment ? BSTP_FLAG_TCA : 0); |
248 | |
249 | bpdu.cbu_rootpri = htons(cu->cu_rootid >> 48); |
250 | bpdu.cbu_rootaddr[0] = cu->cu_rootid >> 40; |
251 | bpdu.cbu_rootaddr[1] = cu->cu_rootid >> 32; |
252 | bpdu.cbu_rootaddr[2] = cu->cu_rootid >> 24; |
253 | bpdu.cbu_rootaddr[3] = cu->cu_rootid >> 16; |
254 | bpdu.cbu_rootaddr[4] = cu->cu_rootid >> 8; |
255 | bpdu.cbu_rootaddr[5] = cu->cu_rootid >> 0; |
256 | |
257 | bpdu.cbu_rootpathcost = htonl(cu->cu_root_path_cost); |
258 | |
259 | bpdu.cbu_bridgepri = htons(cu->cu_rootid >> 48); |
260 | bpdu.cbu_bridgeaddr[0] = cu->cu_rootid >> 40; |
261 | bpdu.cbu_bridgeaddr[1] = cu->cu_rootid >> 32; |
262 | bpdu.cbu_bridgeaddr[2] = cu->cu_rootid >> 24; |
263 | bpdu.cbu_bridgeaddr[3] = cu->cu_rootid >> 16; |
264 | bpdu.cbu_bridgeaddr[4] = cu->cu_rootid >> 8; |
265 | bpdu.cbu_bridgeaddr[5] = cu->cu_rootid >> 0; |
266 | |
267 | bpdu.cbu_portid = htons(cu->cu_port_id); |
268 | bpdu.cbu_messageage = htons(cu->cu_message_age); |
269 | bpdu.cbu_maxage = htons(cu->cu_max_age); |
270 | bpdu.cbu_hellotime = htons(cu->cu_hello_time); |
271 | bpdu.cbu_forwarddelay = htons(cu->cu_forward_delay); |
272 | |
273 | memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), ETHER_ADDR_LEN); |
274 | memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); |
275 | eh->ether_type = htons(sizeof(bpdu)); |
276 | |
277 | memcpy(mtod(m, char *) + sizeof(*eh), &bpdu, sizeof(bpdu)); |
278 | |
279 | BRIDGE_UNLOCK(sc); |
280 | s = splnet(); |
281 | bridge_enqueue(sc, ifp, m, 0); |
282 | splx(s); |
283 | BRIDGE_LOCK(sc); |
284 | } |
285 | |
286 | static int |
287 | bstp_root_bridge(struct bridge_softc *sc) |
288 | { |
289 | return (sc->sc_designated_root == sc->sc_bridge_id); |
290 | } |
291 | |
292 | static int |
293 | bstp_supersedes_port_info(struct bridge_softc *sc, struct bridge_iflist *bif, |
294 | struct bstp_config_unit *cu) |
295 | { |
296 | if (cu->cu_rootid < bif->bif_designated_root) |
297 | return (1); |
298 | if (cu->cu_rootid > bif->bif_designated_root) |
299 | return (0); |
300 | |
301 | if (cu->cu_root_path_cost < bif->bif_designated_cost) |
302 | return (1); |
303 | if (cu->cu_root_path_cost > bif->bif_designated_cost) |
304 | return (0); |
305 | |
306 | if (cu->cu_bridge_id < bif->bif_designated_bridge) |
307 | return (1); |
308 | if (cu->cu_bridge_id > bif->bif_designated_bridge) |
309 | return (0); |
310 | |
311 | if (sc->sc_bridge_id != cu->cu_bridge_id) |
312 | return (1); |
313 | if (cu->cu_port_id <= bif->bif_designated_port) |
314 | return (1); |
315 | return (0); |
316 | } |
317 | |
318 | static void |
319 | bstp_record_config_information(struct bridge_softc *sc, |
320 | struct bridge_iflist *bif, struct bstp_config_unit *cu) |
321 | { |
322 | bif->bif_designated_root = cu->cu_rootid; |
323 | bif->bif_designated_cost = cu->cu_root_path_cost; |
324 | bif->bif_designated_bridge = cu->cu_bridge_id; |
325 | bif->bif_designated_port = cu->cu_port_id; |
326 | bstp_timer_start(&bif->bif_message_age_timer, cu->cu_message_age); |
327 | } |
328 | |
329 | static void |
330 | bstp_record_config_timeout_values(struct bridge_softc *sc, |
331 | struct bstp_config_unit *config) |
332 | { |
333 | sc->sc_max_age = config->cu_max_age; |
334 | sc->sc_hello_time = config->cu_hello_time; |
335 | sc->sc_forward_delay = config->cu_forward_delay; |
336 | sc->sc_topology_change = config->cu_topology_change; |
337 | } |
338 | |
339 | static void |
340 | bstp_config_bpdu_generation(struct bridge_softc *sc) |
341 | { |
342 | struct bridge_iflist *bif; |
343 | |
344 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
345 | if ((bif->bif_flags & IFBIF_STP) == 0) |
346 | continue; |
347 | if (bstp_designated_port(sc, bif) && |
348 | (bif->bif_state != BSTP_IFSTATE_DISABLED)) |
349 | bstp_transmit_config(sc, bif); |
350 | } |
351 | } |
352 | |
353 | static int |
354 | bstp_designated_port(struct bridge_softc *sc, struct bridge_iflist *bif) |
355 | { |
356 | return ((bif->bif_designated_bridge == sc->sc_bridge_id) |
357 | && (bif->bif_designated_port == bif->bif_port_id)); |
358 | } |
359 | |
360 | static void |
361 | bstp_transmit_tcn(struct bridge_softc *sc) |
362 | { |
363 | struct bstp_tbpdu bpdu; |
364 | struct bridge_iflist *bif = sc->sc_root_port; |
365 | struct ifnet *ifp; |
366 | struct ether_header *eh; |
367 | struct mbuf *m; |
368 | int s; |
369 | |
370 | KASSERT(BRIDGE_LOCKED(sc)); |
371 | |
372 | KASSERT(bif != NULL); |
373 | ifp = bif->bif_ifp; |
374 | if ((ifp->if_flags & IFF_RUNNING) == 0) |
375 | return; |
376 | |
377 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
378 | if (m == NULL) |
379 | return; |
380 | |
381 | m_set_rcvif(m, ifp); |
382 | m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); |
383 | m->m_len = m->m_pkthdr.len; |
384 | |
385 | eh = mtod(m, struct ether_header *); |
386 | |
387 | memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), ETHER_ADDR_LEN); |
388 | memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); |
389 | eh->ether_type = htons(sizeof(bpdu)); |
390 | |
391 | bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP; |
392 | bpdu.tbu_ctl = LLC_UI; |
393 | bpdu.tbu_protoid = 0; |
394 | bpdu.tbu_protover = 0; |
395 | bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN; |
396 | |
397 | memcpy(mtod(m, char *) + sizeof(*eh), &bpdu, sizeof(bpdu)); |
398 | |
399 | BRIDGE_UNLOCK(sc); |
400 | s = splnet(); |
401 | bridge_enqueue(sc, ifp, m, 0); |
402 | splx(s); |
403 | BRIDGE_LOCK(sc); |
404 | } |
405 | |
406 | static void |
407 | bstp_configuration_update(struct bridge_softc *sc) |
408 | { |
409 | bstp_root_selection(sc); |
410 | bstp_designated_port_selection(sc); |
411 | } |
412 | |
413 | static void |
414 | bstp_root_selection(struct bridge_softc *sc) |
415 | { |
416 | struct bridge_iflist *root_port = NULL, *bif; |
417 | |
418 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
419 | if ((bif->bif_flags & IFBIF_STP) == 0) |
420 | continue; |
421 | if (bstp_designated_port(sc, bif)) |
422 | continue; |
423 | if (bif->bif_state == BSTP_IFSTATE_DISABLED) |
424 | continue; |
425 | if (bif->bif_designated_root >= sc->sc_bridge_id) |
426 | continue; |
427 | if (root_port == NULL) |
428 | goto set_port; |
429 | |
430 | if (bif->bif_designated_root < root_port->bif_designated_root) |
431 | goto set_port; |
432 | if (bif->bif_designated_root > root_port->bif_designated_root) |
433 | continue; |
434 | |
435 | if ((bif->bif_designated_cost + bif->bif_path_cost) < |
436 | (root_port->bif_designated_cost + root_port->bif_path_cost)) |
437 | goto set_port; |
438 | if ((bif->bif_designated_cost + bif->bif_path_cost) > |
439 | (root_port->bif_designated_cost + root_port->bif_path_cost)) |
440 | continue; |
441 | |
442 | if (bif->bif_designated_bridge < |
443 | root_port->bif_designated_bridge) |
444 | goto set_port; |
445 | if (bif->bif_designated_bridge > |
446 | root_port->bif_designated_bridge) |
447 | continue; |
448 | |
449 | if (bif->bif_designated_port < root_port->bif_designated_port) |
450 | goto set_port; |
451 | if (bif->bif_designated_port > root_port->bif_designated_port) |
452 | continue; |
453 | |
454 | if (bif->bif_port_id >= root_port->bif_port_id) |
455 | continue; |
456 | set_port: |
457 | root_port = bif; |
458 | } |
459 | |
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; |
464 | } else { |
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; |
468 | } |
469 | } |
470 | |
471 | static void |
472 | bstp_designated_port_selection(struct bridge_softc *sc) |
473 | { |
474 | struct bridge_iflist *bif; |
475 | |
476 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
477 | if ((bif->bif_flags & IFBIF_STP) == 0) |
478 | continue; |
479 | if (bstp_designated_port(sc, bif)) |
480 | goto designated; |
481 | if (bif->bif_designated_root != sc->sc_designated_root) |
482 | goto designated; |
483 | |
484 | if (sc->sc_root_path_cost < bif->bif_designated_cost) |
485 | goto designated; |
486 | if (sc->sc_root_path_cost > bif->bif_designated_cost) |
487 | continue; |
488 | |
489 | if (sc->sc_bridge_id < bif->bif_designated_bridge) |
490 | goto designated; |
491 | if (sc->sc_bridge_id > bif->bif_designated_bridge) |
492 | continue; |
493 | |
494 | if (bif->bif_port_id > bif->bif_designated_port) |
495 | continue; |
496 | designated: |
497 | bstp_become_designated_port(sc, bif); |
498 | } |
499 | } |
500 | |
501 | static void |
502 | bstp_become_designated_port(struct bridge_softc *sc, struct bridge_iflist *bif) |
503 | { |
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; |
508 | } |
509 | |
510 | static void |
511 | bstp_port_state_selection(struct bridge_softc *sc) |
512 | { |
513 | struct bridge_iflist *bif; |
514 | |
515 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
516 | if ((bif->bif_flags & IFBIF_STP) == 0) |
517 | continue; |
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); |
525 | } else { |
526 | bif->bif_config_pending = 0; |
527 | bif->bif_topology_change_acknowledge = 0; |
528 | bstp_make_blocking(sc, bif); |
529 | } |
530 | } |
531 | } |
532 | |
533 | static void |
534 | bstp_make_forwarding(struct bridge_softc *sc, |
535 | struct bridge_iflist *bif) |
536 | { |
537 | if (bif->bif_state == BSTP_IFSTATE_BLOCKING) { |
538 | bstp_set_port_state(bif, BSTP_IFSTATE_LISTENING); |
539 | bstp_timer_start(&bif->bif_forward_delay_timer, 0); |
540 | } |
541 | } |
542 | |
543 | static void |
544 | bstp_make_blocking(struct bridge_softc *sc, struct bridge_iflist *bif) |
545 | { |
546 | if ((bif->bif_state != BSTP_IFSTATE_DISABLED) && |
547 | (bif->bif_state != BSTP_IFSTATE_BLOCKING)) { |
548 | if ((bif->bif_state == BSTP_IFSTATE_FORWARDING) || |
549 | (bif->bif_state == BSTP_IFSTATE_LEARNING)) { |
550 | if (bif->bif_change_detection_enabled) { |
551 | bstp_topology_change_detection(sc); |
552 | } |
553 | } |
554 | bstp_set_port_state(bif, BSTP_IFSTATE_BLOCKING); |
555 | bstp_timer_stop(&bif->bif_forward_delay_timer); |
556 | } |
557 | } |
558 | |
559 | static void |
560 | bstp_set_port_state(struct bridge_iflist *bif, uint8_t state) |
561 | { |
562 | bif->bif_state = state; |
563 | } |
564 | |
565 | static void |
566 | bstp_topology_change_detection(struct bridge_softc *sc) |
567 | { |
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); |
574 | } |
575 | sc->sc_topology_change_detected = 1; |
576 | } |
577 | |
578 | static void |
579 | bstp_topology_change_acknowledged(struct bridge_softc *sc) |
580 | { |
581 | sc->sc_topology_change_detected = 0; |
582 | bstp_timer_stop(&sc->sc_tcn_timer); |
583 | } |
584 | |
585 | static void |
586 | bstp_acknowledge_topology_change(struct bridge_softc *sc, |
587 | struct bridge_iflist *bif) |
588 | { |
589 | bif->bif_topology_change_acknowledge = 1; |
590 | bstp_transmit_config(sc, bif); |
591 | } |
592 | |
593 | void |
594 | bstp_input(struct bridge_softc *sc, struct bridge_iflist *bif, struct mbuf *m) |
595 | { |
596 | struct ether_header *eh; |
597 | struct bstp_tbpdu tpdu; |
598 | struct bstp_cbpdu cpdu; |
599 | struct bstp_config_unit cu; |
600 | struct bstp_tcn_unit tu; |
601 | uint16_t len; |
602 | |
603 | #ifdef BRIDGE_MPSAFE |
604 | KASSERT(bif->bif_refs > 0); |
605 | #endif |
606 | |
607 | eh = mtod(m, struct ether_header *); |
608 | |
609 | if ((bif->bif_flags & IFBIF_STP) == 0) |
610 | goto out; |
611 | |
612 | len = ntohs(eh->ether_type); |
613 | if (len < sizeof(tpdu)) |
614 | goto out; |
615 | |
616 | m_adj(m, ETHER_HDR_LEN); |
617 | |
618 | if (m->m_pkthdr.len > len) |
619 | m_adj(m, len - m->m_pkthdr.len); |
620 | if (m->m_len < sizeof(tpdu) && |
621 | (m = m_pullup(m, sizeof(tpdu))) == NULL) |
622 | goto out; |
623 | |
624 | memcpy(&tpdu, mtod(m, void *), sizeof(tpdu)); |
625 | |
626 | if (tpdu.tbu_dsap != LLC_8021D_LSAP || |
627 | tpdu.tbu_ssap != LLC_8021D_LSAP || |
628 | tpdu.tbu_ctl != LLC_UI) |
629 | goto out; |
630 | if (tpdu.tbu_protoid != 0 || tpdu.tbu_protover != 0) |
631 | goto out; |
632 | |
633 | switch (tpdu.tbu_bpdutype) { |
634 | case BSTP_MSGTYPE_TCN: |
635 | tu.tu_message_type = tpdu.tbu_bpdutype; |
636 | |
637 | BRIDGE_LOCK(sc); |
638 | bstp_received_tcn_bpdu(sc, bif, &tu); |
639 | BRIDGE_UNLOCK(sc); |
640 | |
641 | break; |
642 | case BSTP_MSGTYPE_CFG: |
643 | if (m->m_len < sizeof(cpdu) && |
644 | (m = m_pullup(m, sizeof(cpdu))) == NULL) |
645 | goto out; |
646 | memcpy(&cpdu, mtod(m, void *), sizeof(cpdu)); |
647 | |
648 | cu.cu_rootid = |
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); |
656 | |
657 | cu.cu_bridge_id = |
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); |
665 | |
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 | |
678 | BRIDGE_LOCK(sc); |
679 | bstp_received_config_bpdu(sc, bif, &cu); |
680 | BRIDGE_UNLOCK(sc); |
681 | |
682 | break; |
683 | default: |
684 | goto out; |
685 | } |
686 | |
687 | out: |
688 | if (m) |
689 | m_freem(m); |
690 | return; |
691 | } |
692 | |
693 | static void |
694 | bstp_received_config_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif, |
695 | struct bstp_config_unit *cu) |
696 | { |
697 | int root; |
698 | |
699 | root = bstp_root_bridge(sc); |
700 | |
701 | if (bif->bif_state != BSTP_IFSTATE_DISABLED) { |
702 | if (bstp_supersedes_port_info(sc, bif, cu)) { |
703 | bstp_record_config_information(sc, bif, cu); |
704 | bstp_configuration_update(sc); |
705 | bstp_port_state_selection(sc); |
706 | |
707 | if ((bstp_root_bridge(sc) == 0) && root) { |
708 | bstp_timer_stop(&sc->sc_hello_timer); |
709 | |
710 | if (sc->sc_topology_change_detected) { |
711 | bstp_timer_stop( |
712 | &sc->sc_topology_change_timer); |
713 | bstp_transmit_tcn(sc); |
714 | bstp_timer_start(&sc->sc_tcn_timer, 0); |
715 | } |
716 | } |
717 | |
718 | if (bif == sc->sc_root_port) { |
719 | bstp_record_config_timeout_values(sc, cu); |
720 | bstp_config_bpdu_generation(sc); |
721 | |
722 | if (cu->cu_topology_change_acknowledgment) |
723 | bstp_topology_change_acknowledged(sc); |
724 | } |
725 | } else if (bstp_designated_port(sc, bif)) |
726 | bstp_transmit_config(sc, bif); |
727 | } |
728 | } |
729 | |
730 | static void |
731 | bstp_received_tcn_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif, |
732 | struct bstp_tcn_unit *tcn) |
733 | { |
734 | if (bif->bif_state != BSTP_IFSTATE_DISABLED && |
735 | bstp_designated_port(sc, bif)) { |
736 | bstp_topology_change_detection(sc); |
737 | bstp_acknowledge_topology_change(sc, bif); |
738 | } |
739 | } |
740 | |
741 | static void |
742 | bstp_hello_timer_expiry(struct bridge_softc *sc) |
743 | { |
744 | bstp_config_bpdu_generation(sc); |
745 | bstp_timer_start(&sc->sc_hello_timer, 0); |
746 | } |
747 | |
748 | static void |
749 | bstp_message_age_timer_expiry(struct bridge_softc *sc, |
750 | struct bridge_iflist *bif) |
751 | { |
752 | int root; |
753 | |
754 | root = bstp_root_bridge(sc); |
755 | bstp_become_designated_port(sc, bif); |
756 | bstp_configuration_update(sc); |
757 | bstp_port_state_selection(sc); |
758 | |
759 | if ((bstp_root_bridge(sc)) && (root == 0)) { |
760 | sc->sc_max_age = sc->sc_bridge_max_age; |
761 | sc->sc_hello_time = sc->sc_bridge_hello_time; |
762 | sc->sc_forward_delay = sc->sc_bridge_forward_delay; |
763 | |
764 | bstp_topology_change_detection(sc); |
765 | bstp_timer_stop(&sc->sc_tcn_timer); |
766 | bstp_config_bpdu_generation(sc); |
767 | bstp_timer_start(&sc->sc_hello_timer, 0); |
768 | } |
769 | } |
770 | |
771 | static void |
772 | bstp_forward_delay_timer_expiry(struct bridge_softc *sc, |
773 | struct bridge_iflist *bif) |
774 | { |
775 | if (bif->bif_state == BSTP_IFSTATE_LISTENING) { |
776 | bstp_set_port_state(bif, BSTP_IFSTATE_LEARNING); |
777 | bstp_timer_start(&bif->bif_forward_delay_timer, 0); |
778 | } else if (bif->bif_state == BSTP_IFSTATE_LEARNING) { |
779 | bstp_set_port_state(bif, BSTP_IFSTATE_FORWARDING); |
780 | if (bstp_designated_for_some_port(sc) && |
781 | bif->bif_change_detection_enabled) |
782 | bstp_topology_change_detection(sc); |
783 | } |
784 | } |
785 | |
786 | static int |
787 | bstp_designated_for_some_port(struct bridge_softc *sc) |
788 | { |
789 | |
790 | struct bridge_iflist *bif; |
791 | |
792 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
793 | if ((bif->bif_flags & IFBIF_STP) == 0) |
794 | continue; |
795 | if (bif->bif_designated_bridge == sc->sc_bridge_id) |
796 | return (1); |
797 | } |
798 | return (0); |
799 | } |
800 | |
801 | static void |
802 | bstp_tcn_timer_expiry(struct bridge_softc *sc) |
803 | { |
804 | bstp_transmit_tcn(sc); |
805 | bstp_timer_start(&sc->sc_tcn_timer, 0); |
806 | } |
807 | |
808 | static void |
809 | bstp_topology_change_timer_expiry(struct bridge_softc *sc) |
810 | { |
811 | sc->sc_topology_change_detected = 0; |
812 | sc->sc_topology_change = 0; |
813 | } |
814 | |
815 | static void |
816 | bstp_hold_timer_expiry(struct bridge_softc *sc, struct bridge_iflist *bif) |
817 | { |
818 | if (bif->bif_config_pending) |
819 | bstp_transmit_config(sc, bif); |
820 | } |
821 | |
822 | void |
823 | bstp_initialization(struct bridge_softc *sc) |
824 | { |
825 | struct bridge_iflist *bif, *mif; |
826 | |
827 | mif = NULL; |
828 | |
829 | BRIDGE_LOCK(sc); |
830 | |
831 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
832 | if ((bif->bif_flags & IFBIF_STP) == 0) |
833 | continue; |
834 | if (bif->bif_ifp->if_type != IFT_ETHER) |
835 | continue; |
836 | bif->bif_port_id = (bif->bif_priority << 8) | |
837 | (bif->bif_ifp->if_index & 0xff); |
838 | |
839 | if (mif == NULL) { |
840 | mif = bif; |
841 | continue; |
842 | } |
843 | if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), |
844 | CLLADDR(mif->bif_ifp->if_sadl), ETHER_ADDR_LEN) < 0) { |
845 | mif = bif; |
846 | continue; |
847 | } |
848 | } |
849 | |
850 | if (mif == NULL) { |
851 | BRIDGE_UNLOCK(sc); |
852 | bstp_stop(sc); |
853 | return; |
854 | } |
855 | |
856 | sc->sc_bridge_id = |
857 | (((uint64_t)sc->sc_bridge_priority) << 48) | |
858 | (((uint64_t)(uint8_t)CLLADDR(mif->bif_ifp->if_sadl)[0]) << 40) | |
859 | (((uint64_t)(uint8_t)CLLADDR(mif->bif_ifp->if_sadl)[1]) << 32) | |
860 | (((uint64_t)(uint8_t)CLLADDR(mif->bif_ifp->if_sadl)[2]) << 24) | |
861 | (((uint64_t)(uint8_t)CLLADDR(mif->bif_ifp->if_sadl)[3]) << 16) | |
862 | (((uint64_t)(uint8_t)CLLADDR(mif->bif_ifp->if_sadl)[4]) << 8) | |
863 | (((uint64_t)(uint8_t)CLLADDR(mif->bif_ifp->if_sadl)[5]) << 0); |
864 | |
865 | BRIDGE_UNLOCK(sc); |
866 | |
867 | sc->sc_designated_root = sc->sc_bridge_id; |
868 | sc->sc_root_path_cost = 0; |
869 | sc->sc_root_port = NULL; |
870 | |
871 | sc->sc_max_age = sc->sc_bridge_max_age; |
872 | sc->sc_hello_time = sc->sc_bridge_hello_time; |
873 | sc->sc_forward_delay = sc->sc_bridge_forward_delay; |
874 | sc->sc_topology_change_detected = 0; |
875 | sc->sc_topology_change = 0; |
876 | bstp_timer_stop(&sc->sc_tcn_timer); |
877 | bstp_timer_stop(&sc->sc_topology_change_timer); |
878 | |
879 | if (callout_pending(&sc->sc_bstpcallout) == 0) |
880 | callout_reset(&sc->sc_bstpcallout, hz, |
881 | bstp_tick, sc); |
882 | |
883 | BRIDGE_LOCK(sc); |
884 | |
885 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
886 | if (bif->bif_flags & IFBIF_STP) |
887 | bstp_enable_port(sc, bif); |
888 | else |
889 | bstp_disable_port(sc, bif); |
890 | } |
891 | |
892 | bstp_port_state_selection(sc); |
893 | bstp_config_bpdu_generation(sc); |
894 | bstp_timer_start(&sc->sc_hello_timer, 0); |
895 | |
896 | BRIDGE_UNLOCK(sc); |
897 | } |
898 | |
899 | void |
900 | bstp_stop(struct bridge_softc *sc) |
901 | { |
902 | struct bridge_iflist *bif; |
903 | |
904 | BRIDGE_LOCK(sc); |
905 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
906 | bstp_set_port_state(bif, BSTP_IFSTATE_DISABLED); |
907 | bstp_timer_stop(&bif->bif_hold_timer); |
908 | bstp_timer_stop(&bif->bif_message_age_timer); |
909 | bstp_timer_stop(&bif->bif_forward_delay_timer); |
910 | } |
911 | BRIDGE_UNLOCK(sc); |
912 | |
913 | callout_stop(&sc->sc_bstpcallout); |
914 | |
915 | bstp_timer_stop(&sc->sc_topology_change_timer); |
916 | bstp_timer_stop(&sc->sc_tcn_timer); |
917 | bstp_timer_stop(&sc->sc_hello_timer); |
918 | |
919 | } |
920 | |
921 | static void |
922 | bstp_initialize_port(struct bridge_softc *sc, struct bridge_iflist *bif) |
923 | { |
924 | bstp_become_designated_port(sc, bif); |
925 | bstp_set_port_state(bif, BSTP_IFSTATE_BLOCKING); |
926 | bif->bif_topology_change_acknowledge = 0; |
927 | bif->bif_config_pending = 0; |
928 | bif->bif_change_detection_enabled = 1; |
929 | bstp_timer_stop(&bif->bif_message_age_timer); |
930 | bstp_timer_stop(&bif->bif_forward_delay_timer); |
931 | bstp_timer_stop(&bif->bif_hold_timer); |
932 | } |
933 | |
934 | static void |
935 | bstp_enable_port(struct bridge_softc *sc, struct bridge_iflist *bif) |
936 | { |
937 | bstp_initialize_port(sc, bif); |
938 | bstp_port_state_selection(sc); |
939 | } |
940 | |
941 | static void |
942 | bstp_disable_port(struct bridge_softc *sc, struct bridge_iflist *bif) |
943 | { |
944 | int root; |
945 | |
946 | root = bstp_root_bridge(sc); |
947 | bstp_become_designated_port(sc, bif); |
948 | bstp_set_port_state(bif, BSTP_IFSTATE_DISABLED); |
949 | bif->bif_topology_change_acknowledge = 0; |
950 | bif->bif_config_pending = 0; |
951 | bstp_timer_stop(&bif->bif_message_age_timer); |
952 | bstp_timer_stop(&bif->bif_forward_delay_timer); |
953 | bstp_configuration_update(sc); |
954 | bstp_port_state_selection(sc); |
955 | |
956 | if (bstp_root_bridge(sc) && (root == 0)) { |
957 | sc->sc_max_age = sc->sc_bridge_max_age; |
958 | sc->sc_hello_time = sc->sc_bridge_hello_time; |
959 | sc->sc_forward_delay = sc->sc_bridge_forward_delay; |
960 | |
961 | bstp_topology_change_detection(sc); |
962 | bstp_timer_stop(&sc->sc_tcn_timer); |
963 | bstp_config_bpdu_generation(sc); |
964 | bstp_timer_start(&sc->sc_hello_timer, 0); |
965 | } |
966 | } |
967 | |
968 | #if notused |
969 | static void |
970 | bstp_set_bridge_priority(struct bridge_softc *sc, uint64_t new_bridge_id) |
971 | { |
972 | struct bridge_iflist *bif; |
973 | int root; |
974 | |
975 | root = bstp_root_bridge(sc); |
976 | |
977 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
978 | if ((bif->bif_flags & IFBIF_STP) == 0) |
979 | continue; |
980 | if (bstp_designated_port(sc, bif)) |
981 | bif->bif_designated_bridge = new_bridge_id; |
982 | } |
983 | |
984 | sc->sc_bridge_id = new_bridge_id; |
985 | |
986 | bstp_configuration_update(sc); |
987 | bstp_port_state_selection(sc); |
988 | |
989 | if (bstp_root_bridge(sc) && (root == 0)) { |
990 | sc->sc_max_age = sc->sc_bridge_max_age; |
991 | sc->sc_hello_time = sc->sc_bridge_hello_time; |
992 | sc->sc_forward_delay = sc->sc_bridge_forward_delay; |
993 | |
994 | bstp_topology_change_detection(sc); |
995 | bstp_timer_stop(&sc->sc_tcn_timer); |
996 | bstp_config_bpdu_generation(sc); |
997 | bstp_timer_start(&sc->sc_hello_timer, 0); |
998 | } |
999 | } |
1000 | |
1001 | static void |
1002 | bstp_set_port_priority(struct bridge_softc *sc, struct bridge_iflist *bif, |
1003 | uint16_t new_port_id) |
1004 | { |
1005 | if (bstp_designated_port(sc, bif)) |
1006 | bif->bif_designated_port = new_port_id; |
1007 | |
1008 | bif->bif_port_id = new_port_id; |
1009 | |
1010 | if ((sc->sc_bridge_id == bif->bif_designated_bridge) && |
1011 | (bif->bif_port_id < bif->bif_designated_port)) { |
1012 | bstp_become_designated_port(sc, bif); |
1013 | bstp_port_state_selection(sc); |
1014 | } |
1015 | } |
1016 | |
1017 | static void |
1018 | bstp_set_path_cost(struct bridge_softc *sc, struct bridge_iflist *bif, |
1019 | uint32_t path_cost) |
1020 | { |
1021 | bif->bif_path_cost = path_cost; |
1022 | bstp_configuration_update(sc); |
1023 | bstp_port_state_selection(sc); |
1024 | } |
1025 | #endif |
1026 | |
1027 | static void |
1028 | bstp_ifupdstatus(struct bridge_softc *sc, struct bridge_iflist *bif) |
1029 | { |
1030 | struct ifnet *ifp = bif->bif_ifp; |
1031 | |
1032 | if (ifp->if_flags & IFF_UP) { |
1033 | switch (ifp->if_link_state) { |
1034 | case LINK_STATE_UNKNOWN: |
1035 | /* |
1036 | * Just enable the port if the link state is |
1037 | * unknown. |
1038 | */ |
1039 | if (bif->bif_state == BSTP_IFSTATE_DISABLED) |
1040 | bstp_enable_port(sc, bif); |
1041 | break; |
1042 | |
1043 | case LINK_STATE_UP: |
1044 | if (bif->bif_state == BSTP_IFSTATE_DISABLED) |
1045 | bstp_enable_port(sc, bif); |
1046 | break; |
1047 | |
1048 | case LINK_STATE_DOWN: |
1049 | if (bif->bif_state != BSTP_IFSTATE_DISABLED) |
1050 | bstp_disable_port(sc, bif); |
1051 | break; |
1052 | } |
1053 | return; |
1054 | } |
1055 | |
1056 | if (bif->bif_state != BSTP_IFSTATE_DISABLED) |
1057 | bstp_disable_port(sc, bif); |
1058 | } |
1059 | |
1060 | static void |
1061 | bstp_tick(void *arg) |
1062 | { |
1063 | struct bridge_softc *sc = arg; |
1064 | struct bridge_iflist *bif; |
1065 | int s; |
1066 | |
1067 | s = splnet(); |
1068 | BRIDGE_LOCK(sc); |
1069 | |
1070 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
1071 | if ((bif->bif_flags & IFBIF_STP) == 0) |
1072 | continue; |
1073 | /* |
1074 | * XXX This can cause a lag in "link does away" |
1075 | * XXX and "spanning tree gets updated". We need |
1076 | * XXX come sort of callback from the link state |
1077 | * XXX update code to kick spanning tree. |
1078 | * XXX --thorpej@NetBSD.org |
1079 | */ |
1080 | bstp_ifupdstatus(sc, bif); |
1081 | } |
1082 | |
1083 | if (bstp_timer_expired(&sc->sc_hello_timer, sc->sc_hello_time)) |
1084 | bstp_hello_timer_expiry(sc); |
1085 | |
1086 | if (bstp_timer_expired(&sc->sc_tcn_timer, sc->sc_bridge_hello_time)) |
1087 | bstp_tcn_timer_expiry(sc); |
1088 | |
1089 | if (bstp_timer_expired(&sc->sc_topology_change_timer, |
1090 | sc->sc_topology_change_time)) |
1091 | bstp_topology_change_timer_expiry(sc); |
1092 | |
1093 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
1094 | if ((bif->bif_flags & IFBIF_STP) == 0) |
1095 | continue; |
1096 | if (bstp_timer_expired(&bif->bif_message_age_timer, |
1097 | sc->sc_max_age)) |
1098 | bstp_message_age_timer_expiry(sc, bif); |
1099 | } |
1100 | |
1101 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
1102 | if ((bif->bif_flags & IFBIF_STP) == 0) |
1103 | continue; |
1104 | if (bstp_timer_expired(&bif->bif_forward_delay_timer, |
1105 | sc->sc_forward_delay)) |
1106 | bstp_forward_delay_timer_expiry(sc, bif); |
1107 | |
1108 | if (bstp_timer_expired(&bif->bif_hold_timer, |
1109 | sc->sc_hold_time)) |
1110 | bstp_hold_timer_expiry(sc, bif); |
1111 | } |
1112 | |
1113 | if (sc->sc_if.if_flags & IFF_RUNNING) |
1114 | callout_reset(&sc->sc_bstpcallout, hz, bstp_tick, sc); |
1115 | |
1116 | BRIDGE_UNLOCK(sc); |
1117 | splx(s); |
1118 | } |
1119 | |
1120 | static void |
1121 | bstp_timer_start(struct bridge_timer *t, uint16_t v) |
1122 | { |
1123 | t->value = v; |
1124 | t->active = 1; |
1125 | } |
1126 | |
1127 | static void |
1128 | bstp_timer_stop(struct bridge_timer *t) |
1129 | { |
1130 | t->value = 0; |
1131 | t->active = 0; |
1132 | } |
1133 | |
1134 | static int |
1135 | bstp_timer_expired(struct bridge_timer *t, uint16_t v) |
1136 | { |
1137 | if (t->active == 0) |
1138 | return (0); |
1139 | t->value += BSTP_TICK_VAL; |
1140 | if (t->value >= v) { |
1141 | bstp_timer_stop(t); |
1142 | return (1); |
1143 | } |
1144 | return (0); |
1145 | |
1146 | } |
1147 | |