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[apple/xnu.git] / bsd / net / bridgestp.c
1 /* $NetBSD: bridgestp.c,v 1.5 2003/11/28 08:56:48 keihan Exp $ */
2
3 /*
4 * Copyright (c) 2009-2012 Apple Inc. All rights reserved.
5 *
6 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
7 *
8 * This file contains Original Code and/or Modifications of Original Code
9 * as defined in and that are subject to the Apple Public Source License
10 * Version 2.0 (the 'License'). You may not use this file except in
11 * compliance with the License. The rights granted to you under the License
12 * may not be used to create, or enable the creation or redistribution of,
13 * unlawful or unlicensed copies of an Apple operating system, or to
14 * circumvent, violate, or enable the circumvention or violation of, any
15 * terms of an Apple operating system software license agreement.
16 *
17 * Please obtain a copy of the License at
18 * http://www.opensource.apple.com/apsl/ and read it before using this file.
19 *
20 * The Original Code and all software distributed under the License are
21 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
22 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
23 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
25 * Please see the License for the specific language governing rights and
26 * limitations under the License.
27 *
28 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
29 */
30
31 /*
32 * Copyright (c) 2000 Jason L. Wright (jason@thought.net)
33 * Copyright (c) 2006 Andrew Thompson (thompsa@FreeBSD.org)
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 *
45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
46 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
47 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
48 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
49 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
50 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
51 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
53 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
54 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
55 * POSSIBILITY OF SUCH DAMAGE.
56 *
57 * OpenBSD: bridgestp.c,v 1.5 2001/03/22 03:48:29 jason Exp
58 */
59
60 /*
61 * Implementation of the spanning tree protocol as defined in
62 * ISO/IEC 802.1D-2004, June 9, 2004.
63 */
64
65 #include <sys/cdefs.h>
66 //__FBSDID("$FreeBSD$");
67
68 #include <sys/param.h>
69 #include <sys/systm.h>
70 #include <sys/mbuf.h>
71 #include <sys/socket.h>
72 #include <sys/sockio.h>
73 #include <sys/kernel.h>
74 //#include <sys/callout.h>
75 //#include <sys/module.h>
76 #include <sys/proc.h>
77 #include <sys/lock.h>
78 //#include <sys/mutex.h>
79 //#include <sys/taskqueue.h>
80
81 #include <net/if.h>
82 #include <net/if_dl.h>
83 #include <net/if_types.h>
84 #include <net/if_llc.h>
85 #include <net/if_media.h>
86
87 #include <net/kpi_interface.h>
88
89 #include <netinet/in.h>
90 #include <netinet/in_systm.h>
91 #include <netinet/in_var.h>
92 #include <netinet/if_ether.h>
93 #include <net/bridgestp.h>
94
95 #include <kern/thread.h>
96
97 decl_lck_mtx_data(static, bstp_task_mtx_data);
98 static lck_mtx_t *bstp_task_mtx = &bstp_task_mtx_data;
99 static lck_grp_t *bstp_task_grp = NULL;
100 static lck_attr_t *bstp_task_attr = NULL;
101 static thread_t bstp_task_thread;
102 static TAILQ_HEAD(bstp_task_queue, bstp_task)
103 bstp_task_queue = TAILQ_HEAD_INITIALIZER(bstp_task_queue);
104 static struct bstp_task *bstp_task_queue_running = NULL;
105
106 static void bstp_create_task_thread(void);
107 static void bstp_task_thread_func(void);
108
109 static void bstp_task_enqueue(struct bstp_task *);
110 static void bstp_task_drain(struct bstp_task *);
111
112 #define BSTP_TASK_INIT(bt, func, context) do { \
113 (bt)->bt_count = 0; \
114 (bt)->bt_func = func; \
115 (bt)->bt_context = context; \
116 } while(0)
117
118
119
120 #define BSTP_LOCK_INIT(_bs) (_bs)->bs_mtx = lck_mtx_alloc_init(bstp_lock_grp, bstp_lock_attr)
121 #define BSTP_LOCK_DESTROY(_bs) lck_mtx_free((_bs)->bs_mtx, bstp_lock_grp)
122 #define BSTP_LOCK(_bs) lck_mtx_lock((_bs)->bs_mtx)
123 #define BSTP_UNLOCK(_bs) lck_mtx_unlock((_bs)->bs_mtx)
124 #define BSTP_LOCK_ASSERT(_bs) LCK_MTX_ASSERT((_bs)->bs_mtx, LCK_MTX_ASSERT_OWNED)
125
126
127 #ifdef BRIDGESTP_DEBUG
128 #define DPRINTF(fmt, arg...) printf("bstp: " fmt, ##arg)
129 #else
130 #define DPRINTF(fmt, arg...)
131 #endif
132
133 #define PV2ADDR(pv, eaddr) do { \
134 eaddr[0] = pv >> 40; \
135 eaddr[1] = pv >> 32; \
136 eaddr[2] = pv >> 24; \
137 eaddr[3] = pv >> 16; \
138 eaddr[4] = pv >> 8; \
139 eaddr[5] = pv >> 0; \
140 } while (0)
141
142 #define INFO_BETTER 1
143 #define INFO_SAME 0
144 #define INFO_WORSE -1
145
146 LIST_HEAD(, bstp_state) bstp_list;
147 decl_lck_mtx_data(static, bstp_list_mtx_data);
148 static lck_mtx_t *bstp_list_mtx = &bstp_list_mtx_data;
149 static lck_grp_t *bstp_lock_grp = NULL;
150 static lck_attr_t *bstp_lock_attr = NULL;
151
152 static void bstp_transmit(struct bstp_state *, struct bstp_port *);
153 static void bstp_transmit_bpdu(struct bstp_state *, struct bstp_port *);
154 static void bstp_transmit_tcn(struct bstp_state *, struct bstp_port *);
155 static void bstp_decode_bpdu(struct bstp_port *, struct bstp_cbpdu *,
156 struct bstp_config_unit *);
157 static void bstp_send_bpdu(struct bstp_state *, struct bstp_port *,
158 struct bstp_cbpdu *);
159 static void bstp_enqueue(struct ifnet *, struct mbuf *);
160 static int bstp_pdu_flags(struct bstp_port *);
161 static void bstp_received_stp(struct bstp_state *, struct bstp_port *,
162 struct mbuf **, struct bstp_tbpdu *);
163 static void bstp_received_rstp(struct bstp_state *, struct bstp_port *,
164 struct mbuf **, struct bstp_tbpdu *);
165 static void bstp_received_tcn(struct bstp_state *, struct bstp_port *,
166 struct bstp_tcn_unit *);
167 static void bstp_received_bpdu(struct bstp_state *, struct bstp_port *,
168 struct bstp_config_unit *);
169 static int bstp_pdu_rcvtype(struct bstp_port *, struct bstp_config_unit *);
170 static int bstp_pdu_bettersame(struct bstp_port *, int);
171 static int bstp_info_cmp(struct bstp_pri_vector *,
172 struct bstp_pri_vector *);
173 static int bstp_info_superior(struct bstp_pri_vector *,
174 struct bstp_pri_vector *);
175 static void bstp_assign_roles(struct bstp_state *);
176 static void bstp_update_roles(struct bstp_state *, struct bstp_port *);
177 static void bstp_update_state(struct bstp_state *, struct bstp_port *);
178 static void bstp_update_tc(struct bstp_port *);
179 static void bstp_update_info(struct bstp_port *);
180 static void bstp_set_other_tcprop(struct bstp_port *);
181 static void bstp_set_all_reroot(struct bstp_state *);
182 static void bstp_set_all_sync(struct bstp_state *);
183 static void bstp_set_port_state(struct bstp_port *, int);
184 static void bstp_set_port_role(struct bstp_port *, int);
185 static void bstp_set_port_proto(struct bstp_port *, int);
186 static void bstp_set_port_tc(struct bstp_port *, int);
187 static void bstp_set_timer_tc(struct bstp_port *);
188 static void bstp_set_timer_msgage(struct bstp_port *);
189 static int bstp_rerooted(struct bstp_state *, struct bstp_port *);
190 static uint32_t bstp_calc_path_cost(struct bstp_port *);
191 static void bstp_notify_state(void *, int);
192 static void bstp_notify_rtage(void *, int);
193 static void bstp_ifupdstatus(struct bstp_state *, struct bstp_port *);
194 static void bstp_enable_port(struct bstp_state *, struct bstp_port *);
195 static void bstp_disable_port(struct bstp_state *, struct bstp_port *);
196 static void bstp_tick(void *);
197 static void bstp_timer_start(struct bstp_timer *, uint16_t);
198 static void bstp_timer_stop(struct bstp_timer *);
199 static void bstp_timer_latch(struct bstp_timer *);
200 static int bstp_timer_expired(struct bstp_timer *);
201 static void bstp_hello_timer_expiry(struct bstp_state *,
202 struct bstp_port *);
203 static void bstp_message_age_expiry(struct bstp_state *,
204 struct bstp_port *);
205 static void bstp_migrate_delay_expiry(struct bstp_state *,
206 struct bstp_port *);
207 static void bstp_edge_delay_expiry(struct bstp_state *,
208 struct bstp_port *);
209 static int bstp_addr_cmp(const uint8_t *, const uint8_t *);
210 static int bstp_same_bridgeid(uint64_t, uint64_t);
211 static void bstp_reinit(struct bstp_state *);
212
213 static void
214 bstp_transmit(struct bstp_state *bs, struct bstp_port *bp)
215 {
216 if (bs->bs_running == 0) {
217 return;
218 }
219
220 /*
221 * a PDU can only be sent if we have tx quota left and the
222 * hello timer is running.
223 */
224 if (bp->bp_hello_timer.active == 0) {
225 /* Test if it needs to be reset */
226 bstp_hello_timer_expiry(bs, bp);
227 return;
228 }
229 if (bp->bp_txcount > bs->bs_txholdcount) {
230 /* Ran out of karma */
231 return;
232 }
233
234 if (bp->bp_protover == BSTP_PROTO_RSTP) {
235 bstp_transmit_bpdu(bs, bp);
236 bp->bp_tc_ack = 0;
237 } else { /* STP */
238 switch (bp->bp_role) {
239 case BSTP_ROLE_DESIGNATED:
240 bstp_transmit_bpdu(bs, bp);
241 bp->bp_tc_ack = 0;
242 break;
243
244 case BSTP_ROLE_ROOT:
245 bstp_transmit_tcn(bs, bp);
246 break;
247 }
248 }
249 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime);
250 bp->bp_flags &= ~BSTP_PORT_NEWINFO;
251 }
252
253 static void
254 bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp)
255 {
256 struct bstp_cbpdu bpdu;
257
258 BSTP_LOCK_ASSERT(bs);
259
260 bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48);
261 PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr);
262
263 bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost);
264
265 bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48);
266 PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr);
267
268 bpdu.cbu_portid = htons(bp->bp_port_id);
269 bpdu.cbu_messageage = htons(bp->bp_desg_msg_age);
270 bpdu.cbu_maxage = htons(bp->bp_desg_max_age);
271 bpdu.cbu_hellotime = htons(bp->bp_desg_htime);
272 bpdu.cbu_forwarddelay = htons(bp->bp_desg_fdelay);
273
274 bpdu.cbu_flags = bstp_pdu_flags(bp);
275
276 switch (bp->bp_protover) {
277 case BSTP_PROTO_STP:
278 bpdu.cbu_bpdutype = BSTP_MSGTYPE_CFG;
279 break;
280
281 case BSTP_PROTO_RSTP:
282 bpdu.cbu_bpdutype = BSTP_MSGTYPE_RSTP;
283 break;
284 }
285
286 bstp_send_bpdu(bs, bp, &bpdu);
287 }
288
289 static void
290 bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp)
291 {
292 struct bstp_tbpdu bpdu;
293 struct ifnet *ifp = bp->bp_ifp;
294 struct ether_header *eh;
295 struct mbuf *m;
296 int touched = bs ? 1 : 0;
297
298 touched++;
299
300 KASSERT(bp == bs->bs_root_port, ("%s: bad root port\n", __func__));
301
302 if ((ifp->if_flags & IFF_RUNNING) == 0) {
303 return;
304 }
305
306 MGETHDR(m, M_DONTWAIT, MT_DATA);
307 if (m == NULL) {
308 return;
309 }
310
311 m->m_pkthdr.rcvif = ifp;
312 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu);
313 m->m_len = m->m_pkthdr.len;
314
315 eh = mtod(m, struct ether_header *);
316
317 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
318 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
319 eh->ether_type = htons(sizeof(bpdu));
320
321 bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP;
322 bpdu.tbu_ctl = LLC_UI;
323 bpdu.tbu_protoid = 0;
324 bpdu.tbu_protover = 0;
325 bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN;
326
327 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu));
328
329 bp->bp_txcount++;
330 bstp_enqueue(ifp, m);
331 }
332
333 static void
334 bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu,
335 struct bstp_config_unit *cu)
336 {
337 int flags;
338
339 cu->cu_pv.pv_root_id =
340 (((uint64_t)ntohs(cpdu->cbu_rootpri)) << 48) |
341 (((uint64_t)cpdu->cbu_rootaddr[0]) << 40) |
342 (((uint64_t)cpdu->cbu_rootaddr[1]) << 32) |
343 (((uint64_t)cpdu->cbu_rootaddr[2]) << 24) |
344 (((uint64_t)cpdu->cbu_rootaddr[3]) << 16) |
345 (((uint64_t)cpdu->cbu_rootaddr[4]) << 8) |
346 (((uint64_t)cpdu->cbu_rootaddr[5]) << 0);
347
348 cu->cu_pv.pv_dbridge_id =
349 (((uint64_t)ntohs(cpdu->cbu_bridgepri)) << 48) |
350 (((uint64_t)cpdu->cbu_bridgeaddr[0]) << 40) |
351 (((uint64_t)cpdu->cbu_bridgeaddr[1]) << 32) |
352 (((uint64_t)cpdu->cbu_bridgeaddr[2]) << 24) |
353 (((uint64_t)cpdu->cbu_bridgeaddr[3]) << 16) |
354 (((uint64_t)cpdu->cbu_bridgeaddr[4]) << 8) |
355 (((uint64_t)cpdu->cbu_bridgeaddr[5]) << 0);
356
357 cu->cu_pv.pv_cost = ntohl(cpdu->cbu_rootpathcost);
358 cu->cu_message_age = ntohs(cpdu->cbu_messageage);
359 cu->cu_max_age = ntohs(cpdu->cbu_maxage);
360 cu->cu_hello_time = ntohs(cpdu->cbu_hellotime);
361 cu->cu_forward_delay = ntohs(cpdu->cbu_forwarddelay);
362 cu->cu_pv.pv_dport_id = ntohs(cpdu->cbu_portid);
363 cu->cu_pv.pv_port_id = bp->bp_port_id;
364 cu->cu_message_type = cpdu->cbu_bpdutype;
365
366 /* Strip off unused flags in STP mode */
367 flags = cpdu->cbu_flags;
368 switch (cpdu->cbu_protover) {
369 case BSTP_PROTO_STP:
370 flags &= BSTP_PDU_STPMASK;
371 /* A STP BPDU explicitly conveys a Designated Port */
372 cu->cu_role = BSTP_ROLE_DESIGNATED;
373 break;
374
375 case BSTP_PROTO_RSTP:
376 flags &= BSTP_PDU_RSTPMASK;
377 break;
378 }
379
380 cu->cu_topology_change_ack =
381 (flags & BSTP_PDU_F_TCA) ? 1 : 0;
382 cu->cu_proposal =
383 (flags & BSTP_PDU_F_P) ? 1 : 0;
384 cu->cu_agree =
385 (flags & BSTP_PDU_F_A) ? 1 : 0;
386 cu->cu_learning =
387 (flags & BSTP_PDU_F_L) ? 1 : 0;
388 cu->cu_forwarding =
389 (flags & BSTP_PDU_F_F) ? 1 : 0;
390 cu->cu_topology_change =
391 (flags & BSTP_PDU_F_TC) ? 1 : 0;
392
393 switch ((flags & BSTP_PDU_PRMASK) >> BSTP_PDU_PRSHIFT) {
394 case BSTP_PDU_F_ROOT:
395 cu->cu_role = BSTP_ROLE_ROOT;
396 break;
397 case BSTP_PDU_F_ALT:
398 cu->cu_role = BSTP_ROLE_ALTERNATE;
399 break;
400 case BSTP_PDU_F_DESG:
401 cu->cu_role = BSTP_ROLE_DESIGNATED;
402 break;
403 }
404 }
405
406 static void
407 bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp,
408 struct bstp_cbpdu *bpdu)
409 {
410 struct ifnet *ifp;
411 struct mbuf *m;
412 struct ether_header *eh;
413
414 BSTP_LOCK_ASSERT(bs);
415
416 ifp = bp->bp_ifp;
417
418 if ((ifp->if_flags & IFF_RUNNING) == 0) {
419 return;
420 }
421
422 MGETHDR(m, M_DONTWAIT, MT_DATA);
423 if (m == NULL) {
424 return;
425 }
426
427 eh = mtod(m, struct ether_header *);
428
429 bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP;
430 bpdu->cbu_ctl = LLC_UI;
431 bpdu->cbu_protoid = htons(BSTP_PROTO_ID);
432
433 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
434 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
435
436 switch (bpdu->cbu_bpdutype) {
437 case BSTP_MSGTYPE_CFG:
438 bpdu->cbu_protover = BSTP_PROTO_STP;
439 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_STP_LEN;
440 eh->ether_type = htons(BSTP_BPDU_STP_LEN);
441 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu,
442 BSTP_BPDU_STP_LEN);
443 break;
444
445 case BSTP_MSGTYPE_RSTP:
446 bpdu->cbu_protover = BSTP_PROTO_RSTP;
447 bpdu->cbu_versionlen = htons(0);
448 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_RSTP_LEN;
449 eh->ether_type = htons(BSTP_BPDU_RSTP_LEN);
450 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu,
451 BSTP_BPDU_RSTP_LEN);
452 break;
453
454 default:
455 panic("not implemented");
456 }
457 m->m_pkthdr.rcvif = ifp;
458 m->m_len = m->m_pkthdr.len;
459
460 bp->bp_txcount++;
461 bstp_enqueue(ifp, m);
462 }
463
464 static void
465 bstp_enqueue(struct ifnet *dst_ifp, struct mbuf *m)
466 {
467 errno_t error = 0;
468 u_int32_t len = m->m_pkthdr.len;
469
470 m->m_flags |= M_PROTO1; //set to avoid loops
471
472 error = ifnet_output_raw(dst_ifp, 0, m);
473 if (error == 0) {
474 (void) ifnet_stat_increment_out(dst_ifp, 1, len, 0);
475 } else {
476 (void) ifnet_stat_increment_out(dst_ifp, 0, 0, 1);
477 }
478 }
479
480 static int
481 bstp_pdu_flags(struct bstp_port *bp)
482 {
483 int flags = 0;
484
485 if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING) {
486 flags |= BSTP_PDU_F_P;
487 }
488
489 if (bp->bp_agree) {
490 flags |= BSTP_PDU_F_A;
491 }
492
493 if (bp->bp_tc_timer.active) {
494 flags |= BSTP_PDU_F_TC;
495 }
496
497 if (bp->bp_tc_ack) {
498 flags |= BSTP_PDU_F_TCA;
499 }
500
501 switch (bp->bp_state) {
502 case BSTP_IFSTATE_LEARNING:
503 flags |= BSTP_PDU_F_L;
504 break;
505
506 case BSTP_IFSTATE_FORWARDING:
507 flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F);
508 break;
509 }
510
511 switch (bp->bp_role) {
512 case BSTP_ROLE_ROOT:
513 flags |=
514 (BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT);
515 break;
516
517 case BSTP_ROLE_ALTERNATE:
518 case BSTP_ROLE_BACKUP: /* fall through */
519 flags |=
520 (BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT);
521 break;
522
523 case BSTP_ROLE_DESIGNATED:
524 flags |=
525 (BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT);
526 break;
527 }
528
529 /* Strip off unused flags in either mode */
530 switch (bp->bp_protover) {
531 case BSTP_PROTO_STP:
532 flags &= BSTP_PDU_STPMASK;
533 break;
534 case BSTP_PROTO_RSTP:
535 flags &= BSTP_PDU_RSTPMASK;
536 break;
537 }
538 return flags;
539 }
540
541 struct mbuf *
542 bstp_input(struct bstp_port *bp, __unused struct ifnet *ifp, struct mbuf *m)
543 {
544 struct bstp_state *bs = bp->bp_bs;
545 struct ether_header *eh;
546 struct bstp_tbpdu tpdu;
547 uint16_t len;
548
549 if (bp->bp_active == 0) {
550 m_freem(m);
551 return NULL;
552 }
553
554 BSTP_LOCK(bs);
555
556 eh = mtod(m, struct ether_header *);
557
558 len = ntohs(eh->ether_type);
559 if (len < sizeof(tpdu)) {
560 goto out;
561 }
562
563 m_adj(m, ETHER_HDR_LEN);
564
565 if (m->m_pkthdr.len > len) {
566 m_adj(m, len - m->m_pkthdr.len);
567 }
568 if ((unsigned int)m->m_len < sizeof(tpdu) &&
569 (m = m_pullup(m, sizeof(tpdu))) == NULL) {
570 goto out;
571 }
572
573 memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu));
574
575 /* basic packet checks */
576 if (tpdu.tbu_dsap != LLC_8021D_LSAP ||
577 tpdu.tbu_ssap != LLC_8021D_LSAP ||
578 tpdu.tbu_ctl != LLC_UI) {
579 goto out;
580 }
581 if (tpdu.tbu_protoid != BSTP_PROTO_ID) {
582 goto out;
583 }
584
585 /*
586 * We can treat later versions of the PDU as the same as the maximum
587 * version we implement. All additional parameters/flags are ignored.
588 */
589 if (tpdu.tbu_protover > BSTP_PROTO_MAX) {
590 tpdu.tbu_protover = BSTP_PROTO_MAX;
591 }
592
593 if (tpdu.tbu_protover != bp->bp_protover) {
594 /*
595 * Wait for the migration delay timer to expire before changing
596 * protocol version to avoid flip-flops.
597 */
598 if (bp->bp_flags & BSTP_PORT_CANMIGRATE) {
599 bstp_set_port_proto(bp, tpdu.tbu_protover);
600 } else {
601 goto out;
602 }
603 }
604
605 /* Clear operedge upon receiving a PDU on the port */
606 bp->bp_operedge = 0;
607 bstp_timer_start(&bp->bp_edge_delay_timer,
608 BSTP_DEFAULT_MIGRATE_DELAY);
609
610 switch (tpdu.tbu_protover) {
611 case BSTP_PROTO_STP:
612 bstp_received_stp(bs, bp, &m, &tpdu);
613 break;
614
615 case BSTP_PROTO_RSTP:
616 bstp_received_rstp(bs, bp, &m, &tpdu);
617 break;
618 }
619 out:
620 BSTP_UNLOCK(bs);
621 if (m) {
622 m_freem(m);
623 }
624 return NULL;
625 }
626
627 static void
628 bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp,
629 struct mbuf **mp, struct bstp_tbpdu *tpdu)
630 {
631 struct bstp_cbpdu cpdu;
632 struct bstp_config_unit *cu = &bp->bp_msg_cu;
633 struct bstp_tcn_unit tu;
634
635 switch (tpdu->tbu_bpdutype) {
636 case BSTP_MSGTYPE_TCN:
637 tu.tu_message_type = tpdu->tbu_bpdutype;
638 bstp_received_tcn(bs, bp, &tu);
639 break;
640 case BSTP_MSGTYPE_CFG:
641 if ((*mp)->m_len < BSTP_BPDU_STP_LEN &&
642 (*mp = m_pullup(*mp, BSTP_BPDU_STP_LEN)) == NULL) {
643 return;
644 }
645 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_STP_LEN);
646
647 bstp_decode_bpdu(bp, &cpdu, cu);
648 bstp_received_bpdu(bs, bp, cu);
649 break;
650 }
651 }
652
653 static void
654 bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp,
655 struct mbuf **mp, struct bstp_tbpdu *tpdu)
656 {
657 struct bstp_cbpdu cpdu;
658 struct bstp_config_unit *cu = &bp->bp_msg_cu;
659
660 if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP) {
661 return;
662 }
663
664 if ((*mp)->m_len < BSTP_BPDU_RSTP_LEN &&
665 (*mp = m_pullup(*mp, BSTP_BPDU_RSTP_LEN)) == NULL) {
666 return;
667 }
668 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_RSTP_LEN);
669
670 bstp_decode_bpdu(bp, &cpdu, cu);
671 bstp_received_bpdu(bs, bp, cu);
672 }
673
674 static void
675 bstp_received_tcn(__unused struct bstp_state *bs, struct bstp_port *bp,
676 __unused struct bstp_tcn_unit *tcn)
677 {
678 bp->bp_rcvdtcn = 1;
679 bstp_update_tc(bp);
680 }
681
682 static void
683 bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp,
684 struct bstp_config_unit *cu)
685 {
686 int type;
687
688 BSTP_LOCK_ASSERT(bs);
689
690 /* We need to have transitioned to INFO_MINE before proceeding */
691 switch (bp->bp_infois) {
692 case BSTP_INFO_DISABLED:
693 case BSTP_INFO_AGED:
694 return;
695 }
696
697 type = bstp_pdu_rcvtype(bp, cu);
698
699 switch (type) {
700 case BSTP_PDU_SUPERIOR:
701 bs->bs_allsynced = 0;
702 bp->bp_agreed = 0;
703 bp->bp_proposing = 0;
704
705 if (cu->cu_proposal && cu->cu_forwarding == 0) {
706 bp->bp_proposed = 1;
707 }
708 if (cu->cu_topology_change) {
709 bp->bp_rcvdtc = 1;
710 }
711 if (cu->cu_topology_change_ack) {
712 bp->bp_rcvdtca = 1;
713 }
714
715 if (bp->bp_agree &&
716 !bstp_pdu_bettersame(bp, BSTP_INFO_RECEIVED)) {
717 bp->bp_agree = 0;
718 }
719
720 /* copy the received priority and timers to the port */
721 bp->bp_port_pv = cu->cu_pv;
722 bp->bp_port_msg_age = cu->cu_message_age;
723 bp->bp_port_max_age = cu->cu_max_age;
724 bp->bp_port_fdelay = cu->cu_forward_delay;
725 bp->bp_port_htime =
726 (cu->cu_hello_time > BSTP_MIN_HELLO_TIME ?
727 cu->cu_hello_time : BSTP_MIN_HELLO_TIME);
728
729 /* set expiry for the new info */
730 bstp_set_timer_msgage(bp);
731
732 bp->bp_infois = BSTP_INFO_RECEIVED;
733 bstp_assign_roles(bs);
734 break;
735
736 case BSTP_PDU_REPEATED:
737 if (cu->cu_proposal && cu->cu_forwarding == 0) {
738 bp->bp_proposed = 1;
739 }
740 if (cu->cu_topology_change) {
741 bp->bp_rcvdtc = 1;
742 }
743 if (cu->cu_topology_change_ack) {
744 bp->bp_rcvdtca = 1;
745 }
746
747 /* rearm the age timer */
748 bstp_set_timer_msgage(bp);
749 break;
750
751 case BSTP_PDU_INFERIOR:
752 if (cu->cu_learning) {
753 bp->bp_agreed = 1;
754 bp->bp_proposing = 0;
755 }
756 break;
757
758 case BSTP_PDU_INFERIORALT:
759 /*
760 * only point to point links are allowed fast
761 * transitions to forwarding.
762 */
763 if (cu->cu_agree && bp->bp_ptp_link) {
764 bp->bp_agreed = 1;
765 bp->bp_proposing = 0;
766 } else {
767 bp->bp_agreed = 0;
768 }
769
770 if (cu->cu_topology_change) {
771 bp->bp_rcvdtc = 1;
772 }
773 if (cu->cu_topology_change_ack) {
774 bp->bp_rcvdtca = 1;
775 }
776 break;
777
778 case BSTP_PDU_OTHER:
779 return; /* do nothing */
780 }
781 /* update the state machines with the new data */
782 bstp_update_state(bs, bp);
783 }
784
785 static int
786 bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu)
787 {
788 int type;
789
790 /* default return type */
791 type = BSTP_PDU_OTHER;
792
793 switch (cu->cu_role) {
794 case BSTP_ROLE_DESIGNATED:
795 if (bstp_info_superior(&bp->bp_port_pv, &cu->cu_pv)) {
796 /* bpdu priority is superior */
797 type = BSTP_PDU_SUPERIOR;
798 } else if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) ==
799 INFO_SAME) {
800 if (bp->bp_port_msg_age != cu->cu_message_age ||
801 bp->bp_port_max_age != cu->cu_max_age ||
802 bp->bp_port_fdelay != cu->cu_forward_delay ||
803 bp->bp_port_htime != cu->cu_hello_time) {
804 /* bpdu priority is equal and timers differ */
805 type = BSTP_PDU_SUPERIOR;
806 } else {
807 /* bpdu is equal */
808 type = BSTP_PDU_REPEATED;
809 }
810 } else {
811 /* bpdu priority is worse */
812 type = BSTP_PDU_INFERIOR;
813 }
814
815 break;
816
817 case BSTP_ROLE_ROOT:
818 case BSTP_ROLE_ALTERNATE:
819 case BSTP_ROLE_BACKUP:
820 if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) <= INFO_SAME) {
821 /*
822 * not a designated port and priority is the same or
823 * worse
824 */
825 type = BSTP_PDU_INFERIORALT;
826 }
827 break;
828 }
829
830 return type;
831 }
832
833 static int
834 bstp_pdu_bettersame(struct bstp_port *bp, int newinfo)
835 {
836 if (newinfo == BSTP_INFO_RECEIVED &&
837 bp->bp_infois == BSTP_INFO_RECEIVED &&
838 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME) {
839 return 1;
840 }
841
842 if (newinfo == BSTP_INFO_MINE &&
843 bp->bp_infois == BSTP_INFO_MINE &&
844 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) >= INFO_SAME) {
845 return 1;
846 }
847
848 return 0;
849 }
850
851 static int
852 bstp_info_cmp(struct bstp_pri_vector *pv,
853 struct bstp_pri_vector *cpv)
854 {
855 if (cpv->pv_root_id < pv->pv_root_id) {
856 return INFO_BETTER;
857 }
858 if (cpv->pv_root_id > pv->pv_root_id) {
859 return INFO_WORSE;
860 }
861
862 if (cpv->pv_cost < pv->pv_cost) {
863 return INFO_BETTER;
864 }
865 if (cpv->pv_cost > pv->pv_cost) {
866 return INFO_WORSE;
867 }
868
869 if (cpv->pv_dbridge_id < pv->pv_dbridge_id) {
870 return INFO_BETTER;
871 }
872 if (cpv->pv_dbridge_id > pv->pv_dbridge_id) {
873 return INFO_WORSE;
874 }
875
876 if (cpv->pv_dport_id < pv->pv_dport_id) {
877 return INFO_BETTER;
878 }
879 if (cpv->pv_dport_id > pv->pv_dport_id) {
880 return INFO_WORSE;
881 }
882
883 return INFO_SAME;
884 }
885
886 /*
887 * This message priority vector is superior to the port priority vector and
888 * will replace it if, and only if, the message priority vector is better than
889 * the port priority vector, or the message has been transmitted from the same
890 * designated bridge and designated port as the port priority vector.
891 */
892 static int
893 bstp_info_superior(struct bstp_pri_vector *pv,
894 struct bstp_pri_vector *cpv)
895 {
896 if (bstp_info_cmp(pv, cpv) == INFO_BETTER ||
897 (bstp_same_bridgeid(pv->pv_dbridge_id, cpv->pv_dbridge_id) &&
898 (cpv->pv_dport_id & 0xfff) == (pv->pv_dport_id & 0xfff))) {
899 return 1;
900 }
901 return 0;
902 }
903
904 static void
905 bstp_assign_roles(struct bstp_state *bs)
906 {
907 struct bstp_port *bp, *rbp = NULL;
908 struct bstp_pri_vector pv;
909
910 /* default to our priority vector */
911 bs->bs_root_pv = bs->bs_bridge_pv;
912 bs->bs_root_msg_age = 0;
913 bs->bs_root_max_age = bs->bs_bridge_max_age;
914 bs->bs_root_fdelay = bs->bs_bridge_fdelay;
915 bs->bs_root_htime = bs->bs_bridge_htime;
916 bs->bs_root_port = NULL;
917
918 /* check if any recieved info supersedes us */
919 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
920 if (bp->bp_infois != BSTP_INFO_RECEIVED) {
921 continue;
922 }
923
924 pv = bp->bp_port_pv;
925 pv.pv_cost += bp->bp_path_cost;
926
927 /*
928 * The root priority vector is the best of the set comprising
929 * the bridge priority vector plus all root path priority
930 * vectors whose bridge address is not equal to us.
931 */
932 if (bstp_same_bridgeid(pv.pv_dbridge_id,
933 bs->bs_bridge_pv.pv_dbridge_id) == 0 &&
934 bstp_info_cmp(&bs->bs_root_pv, &pv) == INFO_BETTER) {
935 /* the port vector replaces the root */
936 bs->bs_root_pv = pv;
937 bs->bs_root_msg_age = bp->bp_port_msg_age +
938 BSTP_MESSAGE_AGE_INCR;
939 bs->bs_root_max_age = bp->bp_port_max_age;
940 bs->bs_root_fdelay = bp->bp_port_fdelay;
941 bs->bs_root_htime = bp->bp_port_htime;
942 rbp = bp;
943 }
944 }
945
946 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
947 /* calculate the port designated vector */
948 bp->bp_desg_pv.pv_root_id = bs->bs_root_pv.pv_root_id;
949 bp->bp_desg_pv.pv_cost = bs->bs_root_pv.pv_cost;
950 bp->bp_desg_pv.pv_dbridge_id = bs->bs_bridge_pv.pv_dbridge_id;
951 bp->bp_desg_pv.pv_dport_id = bp->bp_port_id;
952 bp->bp_desg_pv.pv_port_id = bp->bp_port_id;
953
954 /* calculate designated times */
955 bp->bp_desg_msg_age = bs->bs_root_msg_age;
956 bp->bp_desg_max_age = bs->bs_root_max_age;
957 bp->bp_desg_fdelay = bs->bs_root_fdelay;
958 bp->bp_desg_htime = bs->bs_bridge_htime;
959
960
961 switch (bp->bp_infois) {
962 case BSTP_INFO_DISABLED:
963 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
964 break;
965
966 case BSTP_INFO_AGED:
967 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
968 bstp_update_info(bp);
969 break;
970
971 case BSTP_INFO_MINE:
972 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
973 /* update the port info if stale */
974 if (bstp_info_cmp(&bp->bp_port_pv,
975 &bp->bp_desg_pv) != INFO_SAME ||
976 (rbp != NULL &&
977 (bp->bp_port_msg_age != rbp->bp_port_msg_age ||
978 bp->bp_port_max_age != rbp->bp_port_max_age ||
979 bp->bp_port_fdelay != rbp->bp_port_fdelay ||
980 bp->bp_port_htime != rbp->bp_port_htime))) {
981 bstp_update_info(bp);
982 }
983 break;
984
985 case BSTP_INFO_RECEIVED:
986 if (bp == rbp) {
987 /*
988 * root priority is derived from this
989 * port, make it the root port.
990 */
991 bstp_set_port_role(bp, BSTP_ROLE_ROOT);
992 bs->bs_root_port = bp;
993 } else if (bstp_info_cmp(&bp->bp_port_pv,
994 &bp->bp_desg_pv) == INFO_BETTER) {
995 /*
996 * the port priority is lower than the root
997 * port.
998 */
999 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
1000 bstp_update_info(bp);
1001 } else {
1002 if (bstp_same_bridgeid(
1003 bp->bp_port_pv.pv_dbridge_id,
1004 bs->bs_bridge_pv.pv_dbridge_id)) {
1005 /*
1006 * the designated bridge refers to
1007 * another port on this bridge.
1008 */
1009 bstp_set_port_role(bp,
1010 BSTP_ROLE_BACKUP);
1011 } else {
1012 /*
1013 * the port is an inferior path to the
1014 * root bridge.
1015 */
1016 bstp_set_port_role(bp,
1017 BSTP_ROLE_ALTERNATE);
1018 }
1019 }
1020 break;
1021 }
1022 }
1023 }
1024
1025 static void
1026 bstp_update_state(struct bstp_state *bs, struct bstp_port *bp)
1027 {
1028 struct bstp_port *bp2;
1029 int synced;
1030
1031 BSTP_LOCK_ASSERT(bs);
1032
1033 /* check if all the ports have syncronised again */
1034 if (!bs->bs_allsynced) {
1035 synced = 1;
1036 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
1037 if (!(bp2->bp_synced ||
1038 bp2->bp_role == BSTP_ROLE_ROOT)) {
1039 synced = 0;
1040 break;
1041 }
1042 }
1043 bs->bs_allsynced = synced;
1044 }
1045
1046 bstp_update_roles(bs, bp);
1047 bstp_update_tc(bp);
1048 }
1049
1050 static void
1051 bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp)
1052 {
1053 switch (bp->bp_role) {
1054 case BSTP_ROLE_DISABLED:
1055 /* Clear any flags if set */
1056 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) {
1057 bp->bp_sync = 0;
1058 bp->bp_synced = 1;
1059 bp->bp_reroot = 0;
1060 }
1061 break;
1062
1063 case BSTP_ROLE_ALTERNATE:
1064 case BSTP_ROLE_BACKUP:
1065 if ((bs->bs_allsynced && !bp->bp_agree) ||
1066 (bp->bp_proposed && bp->bp_agree)) {
1067 bp->bp_proposed = 0;
1068 bp->bp_agree = 1;
1069 bp->bp_flags |= BSTP_PORT_NEWINFO;
1070 DPRINTF("%s -> ALTERNATE_AGREED\n",
1071 bp->bp_ifp->if_xname);
1072 }
1073
1074 if (bp->bp_proposed && !bp->bp_agree) {
1075 bstp_set_all_sync(bs);
1076 bp->bp_proposed = 0;
1077 DPRINTF("%s -> ALTERNATE_PROPOSED\n",
1078 bp->bp_ifp->if_xname);
1079 }
1080
1081 /* Clear any flags if set */
1082 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) {
1083 bp->bp_sync = 0;
1084 bp->bp_synced = 1;
1085 bp->bp_reroot = 0;
1086 DPRINTF("%s -> ALTERNATE_PORT\n", bp->bp_ifp->if_xname);
1087 }
1088 break;
1089
1090 case BSTP_ROLE_ROOT:
1091 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) {
1092 bstp_set_all_reroot(bs);
1093 DPRINTF("%s -> ROOT_REROOT\n", bp->bp_ifp->if_xname);
1094 }
1095
1096 if ((bs->bs_allsynced && !bp->bp_agree) ||
1097 (bp->bp_proposed && bp->bp_agree)) {
1098 bp->bp_proposed = 0;
1099 bp->bp_sync = 0;
1100 bp->bp_agree = 1;
1101 bp->bp_flags |= BSTP_PORT_NEWINFO;
1102 DPRINTF("%s -> ROOT_AGREED\n", bp->bp_ifp->if_xname);
1103 }
1104
1105 if (bp->bp_proposed && !bp->bp_agree) {
1106 bstp_set_all_sync(bs);
1107 bp->bp_proposed = 0;
1108 DPRINTF("%s -> ROOT_PROPOSED\n", bp->bp_ifp->if_xname);
1109 }
1110
1111 if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
1112 (bp->bp_forward_delay_timer.active == 0 ||
1113 (bstp_rerooted(bs, bp) &&
1114 bp->bp_recent_backup_timer.active == 0 &&
1115 bp->bp_protover == BSTP_PROTO_RSTP))) {
1116 switch (bp->bp_state) {
1117 case BSTP_IFSTATE_DISCARDING:
1118 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING);
1119 break;
1120 case BSTP_IFSTATE_LEARNING:
1121 bstp_set_port_state(bp,
1122 BSTP_IFSTATE_FORWARDING);
1123 break;
1124 }
1125 }
1126
1127 if (bp->bp_state == BSTP_IFSTATE_FORWARDING && bp->bp_reroot) {
1128 bp->bp_reroot = 0;
1129 DPRINTF("%s -> ROOT_REROOTED\n", bp->bp_ifp->if_xname);
1130 }
1131 break;
1132
1133 case BSTP_ROLE_DESIGNATED:
1134 if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) {
1135 bp->bp_reroot = 0;
1136 DPRINTF("%s -> DESIGNATED_RETIRED\n",
1137 bp->bp_ifp->if_xname);
1138 }
1139
1140 if ((bp->bp_state == BSTP_IFSTATE_DISCARDING &&
1141 !bp->bp_synced) || (bp->bp_agreed && !bp->bp_synced) ||
1142 (bp->bp_operedge && !bp->bp_synced) ||
1143 (bp->bp_sync && bp->bp_synced)) {
1144 bstp_timer_stop(&bp->bp_recent_root_timer);
1145 bp->bp_synced = 1;
1146 bp->bp_sync = 0;
1147 DPRINTF("%s -> DESIGNATED_SYNCED\n",
1148 bp->bp_ifp->if_xname);
1149 }
1150
1151 if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
1152 !bp->bp_agreed && !bp->bp_proposing &&
1153 !bp->bp_operedge) {
1154 bp->bp_proposing = 1;
1155 bp->bp_flags |= BSTP_PORT_NEWINFO;
1156 bstp_timer_start(&bp->bp_edge_delay_timer,
1157 (bp->bp_ptp_link ? BSTP_DEFAULT_MIGRATE_DELAY :
1158 bp->bp_desg_max_age));
1159 DPRINTF("%s -> DESIGNATED_PROPOSE\n",
1160 bp->bp_ifp->if_xname);
1161 }
1162
1163 if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
1164 (bp->bp_forward_delay_timer.active == 0 || bp->bp_agreed ||
1165 bp->bp_operedge) &&
1166 (bp->bp_recent_root_timer.active == 0 || !bp->bp_reroot) &&
1167 !bp->bp_sync) {
1168 #ifdef BRIDGESTP_DEBUG
1169 if (bp->bp_agreed) {
1170 DPRINTF("%s -> AGREED\n", bp->bp_ifp->if_xname);
1171 }
1172 #endif /* BRIDGESTP_DEBUG */
1173 /*
1174 * If agreed|operedge then go straight to forwarding,
1175 * otherwise follow discard -> learn -> forward.
1176 */
1177 if (bp->bp_agreed || bp->bp_operedge ||
1178 bp->bp_state == BSTP_IFSTATE_LEARNING) {
1179 bstp_set_port_state(bp,
1180 BSTP_IFSTATE_FORWARDING);
1181 bp->bp_agreed = bp->bp_protover;
1182 } else if (bp->bp_state == BSTP_IFSTATE_DISCARDING) {
1183 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING);
1184 }
1185 }
1186
1187 if (((bp->bp_sync && !bp->bp_synced) ||
1188 (bp->bp_reroot && bp->bp_recent_root_timer.active) ||
1189 (bp->bp_flags & BSTP_PORT_DISPUTED)) && !bp->bp_operedge &&
1190 bp->bp_state != BSTP_IFSTATE_DISCARDING) {
1191 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
1192 bp->bp_flags &= ~BSTP_PORT_DISPUTED;
1193 bstp_timer_start(&bp->bp_forward_delay_timer,
1194 bp->bp_protover == BSTP_PROTO_RSTP ?
1195 bp->bp_desg_htime : bp->bp_desg_fdelay);
1196 DPRINTF("%s -> DESIGNATED_DISCARD\n",
1197 bp->bp_ifp->if_xname);
1198 }
1199 break;
1200 }
1201
1202 if (bp->bp_flags & BSTP_PORT_NEWINFO) {
1203 bstp_transmit(bs, bp);
1204 }
1205 }
1206
1207 static void
1208 bstp_update_tc(struct bstp_port *bp)
1209 {
1210 switch (bp->bp_tcstate) {
1211 case BSTP_TCSTATE_ACTIVE:
1212 if ((bp->bp_role != BSTP_ROLE_DESIGNATED &&
1213 bp->bp_role != BSTP_ROLE_ROOT) || bp->bp_operedge) {
1214 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
1215 }
1216
1217 if (bp->bp_rcvdtcn) {
1218 bstp_set_port_tc(bp, BSTP_TCSTATE_TCN);
1219 }
1220 if (bp->bp_rcvdtc) {
1221 bstp_set_port_tc(bp, BSTP_TCSTATE_TC);
1222 }
1223
1224 if (bp->bp_tc_prop && !bp->bp_operedge) {
1225 bstp_set_port_tc(bp, BSTP_TCSTATE_PROPAG);
1226 }
1227
1228 if (bp->bp_rcvdtca) {
1229 bstp_set_port_tc(bp, BSTP_TCSTATE_ACK);
1230 }
1231 break;
1232
1233 case BSTP_TCSTATE_INACTIVE:
1234 if ((bp->bp_state == BSTP_IFSTATE_LEARNING ||
1235 bp->bp_state == BSTP_IFSTATE_FORWARDING) &&
1236 bp->bp_fdbflush == 0) {
1237 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
1238 }
1239 break;
1240
1241 case BSTP_TCSTATE_LEARNING:
1242 if (bp->bp_rcvdtc || bp->bp_rcvdtcn || bp->bp_rcvdtca ||
1243 bp->bp_tc_prop) {
1244 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
1245 } else if (bp->bp_role != BSTP_ROLE_DESIGNATED &&
1246 bp->bp_role != BSTP_ROLE_ROOT &&
1247 bp->bp_state == BSTP_IFSTATE_DISCARDING) {
1248 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
1249 }
1250
1251 if ((bp->bp_role == BSTP_ROLE_DESIGNATED ||
1252 bp->bp_role == BSTP_ROLE_ROOT) &&
1253 bp->bp_state == BSTP_IFSTATE_FORWARDING &&
1254 !bp->bp_operedge) {
1255 bstp_set_port_tc(bp, BSTP_TCSTATE_DETECTED);
1256 }
1257 break;
1258
1259 /* these are transient states and go straight back to ACTIVE */
1260 case BSTP_TCSTATE_DETECTED:
1261 case BSTP_TCSTATE_TCN:
1262 case BSTP_TCSTATE_TC:
1263 case BSTP_TCSTATE_PROPAG:
1264 case BSTP_TCSTATE_ACK:
1265 DPRINTF("Invalid TC state for %s\n",
1266 bp->bp_ifp->if_xname);
1267 break;
1268 }
1269 }
1270
1271 static void
1272 bstp_update_info(struct bstp_port *bp)
1273 {
1274 struct bstp_state *bs = bp->bp_bs;
1275
1276 bp->bp_proposing = 0;
1277 bp->bp_proposed = 0;
1278
1279 if (bp->bp_agreed && !bstp_pdu_bettersame(bp, BSTP_INFO_MINE)) {
1280 bp->bp_agreed = 0;
1281 }
1282
1283 if (bp->bp_synced && !bp->bp_agreed) {
1284 bp->bp_synced = 0;
1285 bs->bs_allsynced = 0;
1286 }
1287
1288 /* copy the designated pv to the port */
1289 bp->bp_port_pv = bp->bp_desg_pv;
1290 bp->bp_port_msg_age = bp->bp_desg_msg_age;
1291 bp->bp_port_max_age = bp->bp_desg_max_age;
1292 bp->bp_port_fdelay = bp->bp_desg_fdelay;
1293 bp->bp_port_htime = bp->bp_desg_htime;
1294 bp->bp_infois = BSTP_INFO_MINE;
1295
1296 /* Set transmit flag but do not immediately send */
1297 bp->bp_flags |= BSTP_PORT_NEWINFO;
1298 }
1299
1300 /* set tcprop on every port other than the caller */
1301 static void
1302 bstp_set_other_tcprop(struct bstp_port *bp)
1303 {
1304 struct bstp_state *bs = bp->bp_bs;
1305 struct bstp_port *bp2;
1306
1307 BSTP_LOCK_ASSERT(bs);
1308
1309 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
1310 if (bp2 == bp) {
1311 continue;
1312 }
1313 bp2->bp_tc_prop = 1;
1314 }
1315 }
1316
1317 static void
1318 bstp_set_all_reroot(struct bstp_state *bs)
1319 {
1320 struct bstp_port *bp;
1321
1322 BSTP_LOCK_ASSERT(bs);
1323
1324 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
1325 bp->bp_reroot = 1;
1326 }
1327
1328 static void
1329 bstp_set_all_sync(struct bstp_state *bs)
1330 {
1331 struct bstp_port *bp;
1332
1333 BSTP_LOCK_ASSERT(bs);
1334
1335 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1336 bp->bp_sync = 1;
1337 bp->bp_synced = 0; /* Not explicit in spec */
1338 }
1339
1340 bs->bs_allsynced = 0;
1341 }
1342
1343 static void
1344 bstp_set_port_state(struct bstp_port *bp, int state)
1345 {
1346 if (bp->bp_state == state) {
1347 return;
1348 }
1349
1350 bp->bp_state = state;
1351
1352 switch (bp->bp_state) {
1353 case BSTP_IFSTATE_DISCARDING:
1354 DPRINTF("state changed to DISCARDING on %s\n",
1355 bp->bp_ifp->if_xname);
1356 break;
1357
1358 case BSTP_IFSTATE_LEARNING:
1359 DPRINTF("state changed to LEARNING on %s\n",
1360 bp->bp_ifp->if_xname);
1361
1362 bstp_timer_start(&bp->bp_forward_delay_timer,
1363 bp->bp_protover == BSTP_PROTO_RSTP ?
1364 bp->bp_desg_htime : bp->bp_desg_fdelay);
1365 break;
1366
1367 case BSTP_IFSTATE_FORWARDING:
1368 DPRINTF("state changed to FORWARDING on %s\n",
1369 bp->bp_ifp->if_xname);
1370
1371 bstp_timer_stop(&bp->bp_forward_delay_timer);
1372 /* Record that we enabled forwarding */
1373 bp->bp_forward_transitions++;
1374 break;
1375 }
1376
1377 /* notify the parent bridge */
1378 bstp_task_enqueue(&bp->bp_statetask);
1379 }
1380
1381 static void
1382 bstp_set_port_role(struct bstp_port *bp, int role)
1383 {
1384 struct bstp_state *bs = bp->bp_bs;
1385
1386 if (bp->bp_role == role) {
1387 return;
1388 }
1389
1390 /* perform pre-change tasks */
1391 switch (bp->bp_role) {
1392 case BSTP_ROLE_DISABLED:
1393 bstp_timer_start(&bp->bp_forward_delay_timer,
1394 bp->bp_desg_max_age);
1395 break;
1396
1397 case BSTP_ROLE_BACKUP:
1398 bstp_timer_start(&bp->bp_recent_backup_timer,
1399 bp->bp_desg_htime * 2);
1400 /* fall through */
1401 case BSTP_ROLE_ALTERNATE:
1402 bstp_timer_start(&bp->bp_forward_delay_timer,
1403 bp->bp_desg_fdelay);
1404 bp->bp_sync = 0;
1405 bp->bp_synced = 1;
1406 bp->bp_reroot = 0;
1407 break;
1408
1409 case BSTP_ROLE_ROOT:
1410 bstp_timer_start(&bp->bp_recent_root_timer,
1411 BSTP_DEFAULT_FORWARD_DELAY);
1412 break;
1413 }
1414
1415 bp->bp_role = role;
1416 /* clear values not carried between roles */
1417 bp->bp_proposing = 0;
1418 bs->bs_allsynced = 0;
1419
1420 /* initialise the new role */
1421 switch (bp->bp_role) {
1422 case BSTP_ROLE_DISABLED:
1423 case BSTP_ROLE_ALTERNATE:
1424 case BSTP_ROLE_BACKUP:
1425 DPRINTF("%s role -> ALT/BACK/DISABLED\n",
1426 bp->bp_ifp->if_xname);
1427 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
1428 bstp_timer_stop(&bp->bp_recent_root_timer);
1429 bstp_timer_latch(&bp->bp_forward_delay_timer);
1430 bp->bp_sync = 0;
1431 bp->bp_synced = 1;
1432 bp->bp_reroot = 0;
1433 break;
1434
1435 case BSTP_ROLE_ROOT:
1436 DPRINTF("%s role -> ROOT\n",
1437 bp->bp_ifp->if_xname);
1438 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
1439 bstp_timer_latch(&bp->bp_recent_root_timer);
1440 bp->bp_proposing = 0;
1441 break;
1442
1443 case BSTP_ROLE_DESIGNATED:
1444 DPRINTF("%s role -> DESIGNATED\n",
1445 bp->bp_ifp->if_xname);
1446 bstp_timer_start(&bp->bp_hello_timer,
1447 bp->bp_desg_htime);
1448 bp->bp_agree = 0;
1449 break;
1450 }
1451
1452 /* let the TC state know that the role changed */
1453 bstp_update_tc(bp);
1454 }
1455
1456 static void
1457 bstp_set_port_proto(struct bstp_port *bp, int proto)
1458 {
1459 struct bstp_state *bs = bp->bp_bs;
1460
1461 /* supported protocol versions */
1462 switch (proto) {
1463 case BSTP_PROTO_STP:
1464 /* we can downgrade protocols only */
1465 bstp_timer_stop(&bp->bp_migrate_delay_timer);
1466 /* clear unsupported features */
1467 bp->bp_operedge = 0;
1468 /* STP compat mode only uses 16 bits of the 32 */
1469 if (bp->bp_path_cost > 65535) {
1470 bp->bp_path_cost = 65535;
1471 }
1472 break;
1473
1474 case BSTP_PROTO_RSTP:
1475 bstp_timer_start(&bp->bp_migrate_delay_timer,
1476 bs->bs_migration_delay);
1477 break;
1478
1479 default:
1480 DPRINTF("Unsupported STP version %d\n", proto);
1481 return;
1482 }
1483
1484 bp->bp_protover = proto;
1485 bp->bp_flags &= ~BSTP_PORT_CANMIGRATE;
1486 }
1487
1488 static void
1489 bstp_set_port_tc(struct bstp_port *bp, int state)
1490 {
1491 struct bstp_state *bs = bp->bp_bs;
1492
1493 bp->bp_tcstate = state;
1494
1495 /* initialise the new state */
1496 switch (bp->bp_tcstate) {
1497 case BSTP_TCSTATE_ACTIVE:
1498 DPRINTF("%s -> TC_ACTIVE\n", bp->bp_ifp->if_xname);
1499 /* nothing to do */
1500 break;
1501
1502 case BSTP_TCSTATE_INACTIVE:
1503 bstp_timer_stop(&bp->bp_tc_timer);
1504 /* flush routes on the parent bridge */
1505 bp->bp_fdbflush = 1;
1506 bstp_task_enqueue(&bp->bp_rtagetask);
1507 bp->bp_tc_ack = 0;
1508 DPRINTF("%s -> TC_INACTIVE\n", bp->bp_ifp->if_xname);
1509 break;
1510
1511 case BSTP_TCSTATE_LEARNING:
1512 bp->bp_rcvdtc = 0;
1513 bp->bp_rcvdtcn = 0;
1514 bp->bp_rcvdtca = 0;
1515 bp->bp_tc_prop = 0;
1516 DPRINTF("%s -> TC_LEARNING\n", bp->bp_ifp->if_xname);
1517 break;
1518
1519 case BSTP_TCSTATE_DETECTED:
1520 bstp_set_timer_tc(bp);
1521 bstp_set_other_tcprop(bp);
1522 /* send out notification */
1523 bp->bp_flags |= BSTP_PORT_NEWINFO;
1524 bstp_transmit(bs, bp);
1525 /* reviewed for getmicrotime usage */
1526 getmicrotime(&bs->bs_last_tc_time);
1527 DPRINTF("%s -> TC_DETECTED\n", bp->bp_ifp->if_xname);
1528 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1529 break;
1530
1531 case BSTP_TCSTATE_TCN:
1532 bstp_set_timer_tc(bp);
1533 DPRINTF("%s -> TC_TCN\n", bp->bp_ifp->if_xname);
1534 /* fall through */
1535 case BSTP_TCSTATE_TC:
1536 bp->bp_rcvdtc = 0;
1537 bp->bp_rcvdtcn = 0;
1538 if (bp->bp_role == BSTP_ROLE_DESIGNATED) {
1539 bp->bp_tc_ack = 1;
1540 }
1541
1542 bstp_set_other_tcprop(bp);
1543 DPRINTF("%s -> TC_TC\n", bp->bp_ifp->if_xname);
1544 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1545 break;
1546
1547 case BSTP_TCSTATE_PROPAG:
1548 /* flush routes on the parent bridge */
1549 bp->bp_fdbflush = 1;
1550 bstp_task_enqueue(&bp->bp_rtagetask);
1551 bp->bp_tc_prop = 0;
1552 bstp_set_timer_tc(bp);
1553 DPRINTF("%s -> TC_PROPAG\n", bp->bp_ifp->if_xname);
1554 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1555 break;
1556
1557 case BSTP_TCSTATE_ACK:
1558 bstp_timer_stop(&bp->bp_tc_timer);
1559 bp->bp_rcvdtca = 0;
1560 DPRINTF("%s -> TC_ACK\n", bp->bp_ifp->if_xname);
1561 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
1562 break;
1563 }
1564 }
1565
1566 static void
1567 bstp_set_timer_tc(struct bstp_port *bp)
1568 {
1569 struct bstp_state *bs = bp->bp_bs;
1570
1571 if (bp->bp_tc_timer.active) {
1572 return;
1573 }
1574
1575 switch (bp->bp_protover) {
1576 case BSTP_PROTO_RSTP:
1577 bstp_timer_start(&bp->bp_tc_timer,
1578 bp->bp_desg_htime + BSTP_TICK_VAL);
1579 bp->bp_flags |= BSTP_PORT_NEWINFO;
1580 break;
1581
1582 case BSTP_PROTO_STP:
1583 bstp_timer_start(&bp->bp_tc_timer,
1584 bs->bs_root_max_age + bs->bs_root_fdelay);
1585 break;
1586 }
1587 }
1588
1589 static void
1590 bstp_set_timer_msgage(struct bstp_port *bp)
1591 {
1592 if (bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR <=
1593 bp->bp_port_max_age) {
1594 bstp_timer_start(&bp->bp_message_age_timer,
1595 bp->bp_port_htime * 3);
1596 } else {
1597 /* expires immediately */
1598 bstp_timer_start(&bp->bp_message_age_timer, 0);
1599 }
1600 }
1601
1602 static int
1603 bstp_rerooted(struct bstp_state *bs, struct bstp_port *bp)
1604 {
1605 struct bstp_port *bp2;
1606 int rr_set = 0;
1607
1608 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
1609 if (bp2 == bp) {
1610 continue;
1611 }
1612 if (bp2->bp_recent_root_timer.active) {
1613 rr_set = 1;
1614 break;
1615 }
1616 }
1617 return !rr_set;
1618 }
1619
1620 int
1621 bstp_set_htime(struct bstp_state *bs, int t)
1622 {
1623 /* convert seconds to ticks */
1624 t *= BSTP_TICK_VAL;
1625
1626 /* value can only be changed in leagacy stp mode */
1627 if (bs->bs_protover != BSTP_PROTO_STP) {
1628 return EPERM;
1629 }
1630
1631 if (t < BSTP_MIN_HELLO_TIME || t > BSTP_MAX_HELLO_TIME) {
1632 return EINVAL;
1633 }
1634
1635 BSTP_LOCK(bs);
1636 bs->bs_bridge_htime = t;
1637 bstp_reinit(bs);
1638 BSTP_UNLOCK(bs);
1639 return 0;
1640 }
1641
1642 int
1643 bstp_set_fdelay(struct bstp_state *bs, int t)
1644 {
1645 /* convert seconds to ticks */
1646 t *= BSTP_TICK_VAL;
1647
1648 if (t < BSTP_MIN_FORWARD_DELAY || t > BSTP_MAX_FORWARD_DELAY) {
1649 return EINVAL;
1650 }
1651
1652 BSTP_LOCK(bs);
1653 bs->bs_bridge_fdelay = t;
1654 bstp_reinit(bs);
1655 BSTP_UNLOCK(bs);
1656 return 0;
1657 }
1658
1659 int
1660 bstp_set_maxage(struct bstp_state *bs, int t)
1661 {
1662 /* convert seconds to ticks */
1663 t *= BSTP_TICK_VAL;
1664
1665 if (t < BSTP_MIN_MAX_AGE || t > BSTP_MAX_MAX_AGE) {
1666 return EINVAL;
1667 }
1668
1669 BSTP_LOCK(bs);
1670 bs->bs_bridge_max_age = t;
1671 bstp_reinit(bs);
1672 BSTP_UNLOCK(bs);
1673 return 0;
1674 }
1675
1676 int
1677 bstp_set_holdcount(struct bstp_state *bs, int count)
1678 {
1679 struct bstp_port *bp;
1680
1681 if (count < BSTP_MIN_HOLD_COUNT ||
1682 count > BSTP_MAX_HOLD_COUNT) {
1683 return EINVAL;
1684 }
1685
1686 BSTP_LOCK(bs);
1687 bs->bs_txholdcount = count;
1688 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
1689 bp->bp_txcount = 0;
1690 BSTP_UNLOCK(bs);
1691 return 0;
1692 }
1693
1694 int
1695 bstp_set_protocol(struct bstp_state *bs, int proto)
1696 {
1697 struct bstp_port *bp;
1698
1699 switch (proto) {
1700 /* Supported protocol versions */
1701 case BSTP_PROTO_STP:
1702 case BSTP_PROTO_RSTP:
1703 break;
1704
1705 default:
1706 return EINVAL;
1707 }
1708
1709 BSTP_LOCK(bs);
1710 bs->bs_protover = proto;
1711 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME;
1712 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1713 /* reinit state */
1714 bp->bp_infois = BSTP_INFO_DISABLED;
1715 bp->bp_txcount = 0;
1716 bstp_set_port_proto(bp, bs->bs_protover);
1717 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
1718 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
1719 bstp_timer_stop(&bp->bp_recent_backup_timer);
1720 }
1721 bstp_reinit(bs);
1722 BSTP_UNLOCK(bs);
1723 return 0;
1724 }
1725
1726 int
1727 bstp_set_priority(struct bstp_state *bs, int pri)
1728 {
1729 if (pri < 0 || pri > BSTP_MAX_PRIORITY) {
1730 return EINVAL;
1731 }
1732
1733 /* Limit to steps of 4096 */
1734 pri -= pri % 4096;
1735
1736 BSTP_LOCK(bs);
1737 bs->bs_bridge_priority = pri;
1738 bstp_reinit(bs);
1739 BSTP_UNLOCK(bs);
1740 return 0;
1741 }
1742
1743 int
1744 bstp_set_port_priority(struct bstp_port *bp, int pri)
1745 {
1746 struct bstp_state *bs = bp->bp_bs;
1747
1748 if (pri < 0 || pri > BSTP_MAX_PORT_PRIORITY) {
1749 return EINVAL;
1750 }
1751
1752 /* Limit to steps of 16 */
1753 pri -= pri % 16;
1754
1755 BSTP_LOCK(bs);
1756 bp->bp_priority = pri;
1757 bstp_reinit(bs);
1758 BSTP_UNLOCK(bs);
1759 return 0;
1760 }
1761
1762 int
1763 bstp_set_path_cost(struct bstp_port *bp, uint32_t path_cost)
1764 {
1765 struct bstp_state *bs = bp->bp_bs;
1766
1767 if (path_cost > BSTP_MAX_PATH_COST) {
1768 return EINVAL;
1769 }
1770
1771 /* STP compat mode only uses 16 bits of the 32 */
1772 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) {
1773 path_cost = 65535;
1774 }
1775
1776 BSTP_LOCK(bs);
1777
1778 if (path_cost == 0) { /* use auto */
1779 bp->bp_flags &= ~BSTP_PORT_ADMCOST;
1780 bp->bp_path_cost = bstp_calc_path_cost(bp);
1781 } else {
1782 bp->bp_path_cost = path_cost;
1783 bp->bp_flags |= BSTP_PORT_ADMCOST;
1784 }
1785 bstp_reinit(bs);
1786 BSTP_UNLOCK(bs);
1787 return 0;
1788 }
1789
1790 int
1791 bstp_set_edge(struct bstp_port *bp, int set)
1792 {
1793 struct bstp_state *bs = bp->bp_bs;
1794
1795 BSTP_LOCK(bs);
1796 if ((bp->bp_operedge = set) == 0) {
1797 bp->bp_flags &= ~BSTP_PORT_ADMEDGE;
1798 } else {
1799 bp->bp_flags |= BSTP_PORT_ADMEDGE;
1800 }
1801 BSTP_UNLOCK(bs);
1802 return 0;
1803 }
1804
1805 int
1806 bstp_set_autoedge(struct bstp_port *bp, int set)
1807 {
1808 struct bstp_state *bs = bp->bp_bs;
1809
1810 BSTP_LOCK(bs);
1811 if (set) {
1812 bp->bp_flags |= BSTP_PORT_AUTOEDGE;
1813 /* we may be able to transition straight to edge */
1814 if (bp->bp_edge_delay_timer.active == 0) {
1815 bstp_edge_delay_expiry(bs, bp);
1816 }
1817 } else {
1818 bp->bp_flags &= ~BSTP_PORT_AUTOEDGE;
1819 }
1820 BSTP_UNLOCK(bs);
1821 return 0;
1822 }
1823
1824 int
1825 bstp_set_ptp(struct bstp_port *bp, int set)
1826 {
1827 struct bstp_state *bs = bp->bp_bs;
1828
1829 BSTP_LOCK(bs);
1830 bp->bp_ptp_link = set;
1831 BSTP_UNLOCK(bs);
1832 return 0;
1833 }
1834
1835 int
1836 bstp_set_autoptp(struct bstp_port *bp, int set)
1837 {
1838 struct bstp_state *bs = bp->bp_bs;
1839
1840 BSTP_LOCK(bs);
1841 if (set) {
1842 bp->bp_flags |= BSTP_PORT_AUTOPTP;
1843 if (bp->bp_role != BSTP_ROLE_DISABLED) {
1844 bstp_ifupdstatus(bs, bp);
1845 }
1846 } else {
1847 bp->bp_flags &= ~BSTP_PORT_AUTOPTP;
1848 }
1849 BSTP_UNLOCK(bs);
1850 return 0;
1851 }
1852
1853 /*
1854 * Calculate the path cost according to the link speed.
1855 */
1856 static uint32_t
1857 bstp_calc_path_cost(struct bstp_port *bp)
1858 {
1859 struct ifnet *ifp = bp->bp_ifp;
1860 uint32_t path_cost;
1861
1862 /* If the priority has been manually set then retain the value */
1863 if (bp->bp_flags & BSTP_PORT_ADMCOST) {
1864 return bp->bp_path_cost;
1865 }
1866
1867 if (bp->bp_if_link_state == LINK_STATE_DOWN) {
1868 /* Recalc when the link comes up again */
1869 bp->bp_flags |= BSTP_PORT_PNDCOST;
1870 return BSTP_DEFAULT_PATH_COST;
1871 }
1872
1873 if (ifp->if_baudrate < 1000) {
1874 return BSTP_DEFAULT_PATH_COST;
1875 }
1876
1877 /* formula from section 17.14, IEEE Std 802.1D-2004 */
1878 path_cost = 20000000000ULL / (ifp->if_baudrate / 1000);
1879
1880 if (path_cost > BSTP_MAX_PATH_COST) {
1881 path_cost = BSTP_MAX_PATH_COST;
1882 }
1883
1884 /* STP compat mode only uses 16 bits of the 32 */
1885 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) {
1886 path_cost = 65535;
1887 }
1888
1889 return path_cost;
1890 }
1891
1892 /*
1893 * Notify the bridge that a port state has changed, we need to do this from a
1894 * taskqueue to avoid a LOR.
1895 */
1896 static void
1897 bstp_notify_state(void *arg, __unused int pending)
1898 {
1899 struct bstp_port *bp = (struct bstp_port *)arg;
1900 struct bstp_state *bs = bp->bp_bs;
1901
1902 if (bp->bp_active == 1 && bs->bs_state_cb != NULL) {
1903 (*bs->bs_state_cb)(bp->bp_ifp, bp->bp_state);
1904 }
1905 }
1906
1907 /*
1908 * Flush the routes on the bridge port, we need to do this from a
1909 * taskqueue to avoid a LOR.
1910 */
1911 static void
1912 bstp_notify_rtage(void *arg, __unused int pending)
1913 {
1914 struct bstp_port *bp = (struct bstp_port *)arg;
1915 struct bstp_state *bs = bp->bp_bs;
1916 int age = 0;
1917
1918 BSTP_LOCK(bs);
1919 switch (bp->bp_protover) {
1920 case BSTP_PROTO_STP:
1921 /* convert to seconds */
1922 age = bp->bp_desg_fdelay / BSTP_TICK_VAL;
1923 break;
1924
1925 case BSTP_PROTO_RSTP:
1926 age = 0;
1927 break;
1928 }
1929 BSTP_UNLOCK(bs);
1930
1931 if (bp->bp_active == 1 && bs->bs_rtage_cb != NULL) {
1932 (*bs->bs_rtage_cb)(bp->bp_ifp, age);
1933 }
1934
1935 /* flush is complete */
1936 BSTP_LOCK(bs);
1937 bp->bp_fdbflush = 0;
1938 BSTP_UNLOCK(bs);
1939 }
1940
1941 void
1942 bstp_linkstate(struct ifnet *ifp, __unused int state)
1943 {
1944 struct bstp_state *bs;
1945 struct bstp_port *bp;
1946
1947 /* search for the stp port */
1948 lck_mtx_lock(bstp_list_mtx);
1949 LIST_FOREACH(bs, &bstp_list, bs_list) {
1950 BSTP_LOCK(bs);
1951 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
1952 if (bp->bp_ifp == ifp) {
1953 bstp_ifupdstatus(bs, bp);
1954 bstp_update_state(bs, bp);
1955 /* it only exists once so return */
1956 BSTP_UNLOCK(bs);
1957 lck_mtx_unlock(bstp_list_mtx);
1958 return;
1959 }
1960 }
1961 BSTP_UNLOCK(bs);
1962 }
1963 lck_mtx_unlock(bstp_list_mtx);
1964 }
1965
1966 static void
1967 bstp_ifupdstatus(struct bstp_state *bs, struct bstp_port *bp)
1968 {
1969 struct ifnet *ifp = bp->bp_ifp;
1970 struct ifmediareq ifmr;
1971 int error = 0;
1972
1973 BSTP_LOCK_ASSERT(bs);
1974
1975 bzero((char *)&ifmr, sizeof(ifmr));
1976 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
1977
1978 if ((error == 0) && (ifp->if_flags & IFF_UP)) {
1979 if (ifmr.ifm_status & IFM_ACTIVE) {
1980 /* A full-duplex link is assumed to be point to point */
1981 if (bp->bp_flags & BSTP_PORT_AUTOPTP) {
1982 bp->bp_ptp_link =
1983 ifmr.ifm_active & IFM_FDX ? 1 : 0;
1984 }
1985
1986 /* Calc the cost if the link was down previously */
1987 if (bp->bp_flags & BSTP_PORT_PNDCOST) {
1988 bp->bp_path_cost = bstp_calc_path_cost(bp);
1989 bp->bp_flags &= ~BSTP_PORT_PNDCOST;
1990 }
1991
1992 if (bp->bp_role == BSTP_ROLE_DISABLED) {
1993 bstp_enable_port(bs, bp);
1994 }
1995 } else {
1996 if (bp->bp_role != BSTP_ROLE_DISABLED) {
1997 bstp_disable_port(bs, bp);
1998 if ((bp->bp_flags & BSTP_PORT_ADMEDGE) &&
1999 bp->bp_protover == BSTP_PROTO_RSTP) {
2000 bp->bp_operedge = 1;
2001 }
2002 }
2003 }
2004 return;
2005 }
2006
2007 if (bp->bp_infois != BSTP_INFO_DISABLED) {
2008 bstp_disable_port(bs, bp);
2009 }
2010 }
2011
2012 static void
2013 bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp)
2014 {
2015 bp->bp_infois = BSTP_INFO_AGED;
2016 bstp_assign_roles(bs);
2017 }
2018
2019 static void
2020 bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp)
2021 {
2022 bp->bp_infois = BSTP_INFO_DISABLED;
2023 bstp_assign_roles(bs);
2024 }
2025
2026 static void
2027 bstp_tick(void *arg)
2028 {
2029 struct bstp_state *bs = arg;
2030 struct bstp_port *bp;
2031 struct timespec ts;
2032
2033 BSTP_LOCK(bs);
2034
2035 if (bs->bs_running == 0) {
2036 return;
2037 }
2038
2039 /* slow timer to catch missed link events */
2040 if (bstp_timer_expired(&bs->bs_link_timer)) {
2041 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
2042 bstp_ifupdstatus(bs, bp);
2043 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER);
2044 }
2045
2046 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
2047 /* no events need to happen for these */
2048 bstp_timer_expired(&bp->bp_tc_timer);
2049 bstp_timer_expired(&bp->bp_recent_root_timer);
2050 bstp_timer_expired(&bp->bp_forward_delay_timer);
2051 bstp_timer_expired(&bp->bp_recent_backup_timer);
2052
2053 if (bstp_timer_expired(&bp->bp_hello_timer)) {
2054 bstp_hello_timer_expiry(bs, bp);
2055 }
2056
2057 if (bstp_timer_expired(&bp->bp_message_age_timer)) {
2058 bstp_message_age_expiry(bs, bp);
2059 }
2060
2061 if (bstp_timer_expired(&bp->bp_migrate_delay_timer)) {
2062 bstp_migrate_delay_expiry(bs, bp);
2063 }
2064
2065 if (bstp_timer_expired(&bp->bp_edge_delay_timer)) {
2066 bstp_edge_delay_expiry(bs, bp);
2067 }
2068
2069 /* update the various state machines for the port */
2070 bstp_update_state(bs, bp);
2071
2072 if (bp->bp_txcount > 0) {
2073 bp->bp_txcount--;
2074 }
2075 }
2076
2077 BSTP_UNLOCK(bs);
2078
2079 ts.tv_sec = 1;
2080 ts.tv_nsec = 0;
2081 bsd_timeout(bstp_tick, bs, &ts);
2082 }
2083
2084 static void
2085 bstp_timer_start(struct bstp_timer *t, uint16_t v)
2086 {
2087 t->value = v;
2088 t->active = 1;
2089 t->latched = 0;
2090 }
2091
2092 static void
2093 bstp_timer_stop(struct bstp_timer *t)
2094 {
2095 t->value = 0;
2096 t->active = 0;
2097 t->latched = 0;
2098 }
2099
2100 static void
2101 bstp_timer_latch(struct bstp_timer *t)
2102 {
2103 t->latched = 1;
2104 t->active = 1;
2105 }
2106
2107 static int
2108 bstp_timer_expired(struct bstp_timer *t)
2109 {
2110 if (t->active == 0 || t->latched) {
2111 return 0;
2112 }
2113 t->value -= BSTP_TICK_VAL;
2114 if (t->value <= 0) {
2115 bstp_timer_stop(t);
2116 return 1;
2117 }
2118 return 0;
2119 }
2120
2121 static void
2122 bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp)
2123 {
2124 if ((bp->bp_flags & BSTP_PORT_NEWINFO) ||
2125 bp->bp_role == BSTP_ROLE_DESIGNATED ||
2126 (bp->bp_role == BSTP_ROLE_ROOT &&
2127 bp->bp_tc_timer.active == 1)) {
2128 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime);
2129 bp->bp_flags |= BSTP_PORT_NEWINFO;
2130 bstp_transmit(bs, bp);
2131 }
2132 }
2133
2134 static void
2135 bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp)
2136 {
2137 if (bp->bp_infois == BSTP_INFO_RECEIVED) {
2138 bp->bp_infois = BSTP_INFO_AGED;
2139 bstp_assign_roles(bs);
2140 DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname);
2141 }
2142 }
2143
2144 static void
2145 bstp_migrate_delay_expiry(__unused struct bstp_state *bs, struct bstp_port *bp)
2146 {
2147 bp->bp_flags |= BSTP_PORT_CANMIGRATE;
2148 }
2149
2150 static void
2151 bstp_edge_delay_expiry(__unused struct bstp_state *bs, struct bstp_port *bp)
2152 {
2153 if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) &&
2154 bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing &&
2155 bp->bp_role == BSTP_ROLE_DESIGNATED) {
2156 bp->bp_operedge = 1;
2157 DPRINTF("%s -> edge port\n", bp->bp_ifp->if_xname);
2158 }
2159 }
2160
2161 static int
2162 bstp_addr_cmp(const uint8_t *a, const uint8_t *b)
2163 {
2164 int i, d;
2165
2166 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2167 d = ((int)a[i]) - ((int)b[i]);
2168 }
2169
2170 return d;
2171 }
2172
2173 /*
2174 * compare the bridge address component of the bridgeid
2175 */
2176 static int
2177 bstp_same_bridgeid(uint64_t id1, uint64_t id2)
2178 {
2179 u_char addr1[ETHER_ADDR_LEN];
2180 u_char addr2[ETHER_ADDR_LEN];
2181
2182 PV2ADDR(id1, addr1);
2183 PV2ADDR(id2, addr2);
2184
2185 if (bstp_addr_cmp(addr1, addr2) == 0) {
2186 return 1;
2187 }
2188
2189 return 0;
2190 }
2191
2192 void
2193 bstp_reinit(struct bstp_state *bs)
2194 {
2195 struct bstp_port *bp;
2196 struct ifnet *ifp, *mif;
2197 u_char *e_addr;
2198 static const u_char llzero[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
2199
2200 BSTP_LOCK_ASSERT(bs);
2201
2202 mif = NULL;
2203 /*
2204 * Search through the Ethernet adapters and find the one with the
2205 * lowest value. The adapter which we take the MAC address from does
2206 * not need to be part of the bridge, it just needs to be a unique
2207 * value.
2208 */
2209 ifnet_head_lock_shared();
2210 TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
2211 if (ifp->if_type != IFT_ETHER) {
2212 continue;
2213 }
2214
2215 if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0) {
2216 continue;
2217 }
2218
2219 if (mif == NULL) {
2220 mif = ifp;
2221 continue;
2222 }
2223 if (bstp_addr_cmp(IF_LLADDR(ifp), IF_LLADDR(mif)) < 0) {
2224 mif = ifp;
2225 continue;
2226 }
2227 }
2228 ifnet_head_done();
2229
2230 if (LIST_EMPTY(&bs->bs_bplist) || mif == NULL) {
2231 /* Set the bridge and root id (lower bits) to zero */
2232 bs->bs_bridge_pv.pv_dbridge_id =
2233 ((uint64_t)bs->bs_bridge_priority) << 48;
2234 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id;
2235 bs->bs_root_pv = bs->bs_bridge_pv;
2236 /* Disable any remaining ports, they will have no MAC address */
2237 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
2238 bp->bp_infois = BSTP_INFO_DISABLED;
2239 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
2240 }
2241 bsd_untimeout(bstp_tick, bs);
2242 return;
2243 }
2244
2245 e_addr = IF_LLADDR(mif);
2246 bs->bs_bridge_pv.pv_dbridge_id =
2247 (((uint64_t)bs->bs_bridge_priority) << 48) |
2248 (((uint64_t)e_addr[0]) << 40) |
2249 (((uint64_t)e_addr[1]) << 32) |
2250 (((uint64_t)e_addr[2]) << 24) |
2251 (((uint64_t)e_addr[3]) << 16) |
2252 (((uint64_t)e_addr[4]) << 8) |
2253 (((uint64_t)e_addr[5]));
2254
2255 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id;
2256 bs->bs_bridge_pv.pv_cost = 0;
2257 bs->bs_bridge_pv.pv_dport_id = 0;
2258 bs->bs_bridge_pv.pv_port_id = 0;
2259
2260 if (bs->bs_running) {
2261 bsd_untimeout(bstp_tick, bs);
2262 }
2263
2264 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
2265 bp->bp_port_id = (bp->bp_priority << 8) |
2266 (bp->bp_ifp->if_index & 0xfff);
2267 bstp_ifupdstatus(bs, bp);
2268 }
2269
2270 bstp_assign_roles(bs);
2271 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER);
2272 }
2273
2274 void
2275 bstp_attach(struct bstp_state *bs, struct bstp_cb_ops *cb)
2276 {
2277 BSTP_LOCK_INIT(bs);
2278 LIST_INIT(&bs->bs_bplist);
2279
2280 bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE;
2281 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME;
2282 bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY;
2283 bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY;
2284 bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME;
2285 bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY;
2286 bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT;
2287 bs->bs_protover = BSTP_PROTO_RSTP;
2288 bs->bs_state_cb = cb->bcb_state;
2289 bs->bs_rtage_cb = cb->bcb_rtage;
2290
2291 /* reviewed for getmicrotime usage */
2292 getmicrotime(&bs->bs_last_tc_time);
2293
2294 lck_mtx_lock(bstp_list_mtx);
2295 LIST_INSERT_HEAD(&bstp_list, bs, bs_list);
2296 lck_mtx_unlock(bstp_list_mtx);
2297 }
2298
2299 void
2300 bstp_detach(struct bstp_state *bs)
2301 {
2302 KASSERT(LIST_EMPTY(&bs->bs_bplist), ("bstp still active"));
2303
2304 lck_mtx_lock(bstp_list_mtx);
2305 LIST_REMOVE(bs, bs_list);
2306 lck_mtx_unlock(bstp_list_mtx);
2307 bsd_untimeout(bstp_tick, bs);
2308 BSTP_LOCK_DESTROY(bs);
2309 }
2310
2311 void
2312 bstp_init(struct bstp_state *bs)
2313 {
2314 struct timespec ts;
2315
2316 ts.tv_sec = 1;
2317 ts.tv_nsec = 0;
2318
2319 BSTP_LOCK(bs);
2320 bsd_timeout(bstp_tick, bs, &ts);
2321 bs->bs_running = 1;
2322 bstp_reinit(bs);
2323 BSTP_UNLOCK(bs);
2324 }
2325
2326 void
2327 bstp_stop(struct bstp_state *bs)
2328 {
2329 struct bstp_port *bp;
2330
2331 BSTP_LOCK(bs);
2332
2333 LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
2334 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
2335
2336 bs->bs_running = 0;
2337 bsd_untimeout(bstp_tick, bs);
2338 BSTP_UNLOCK(bs);
2339 }
2340
2341 int
2342 bstp_create(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *ifp)
2343 {
2344 bzero(bp, sizeof(struct bstp_port));
2345
2346 BSTP_LOCK(bs);
2347 bp->bp_ifp = ifp;
2348 bp->bp_bs = bs;
2349 bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY;
2350 BSTP_TASK_INIT(&bp->bp_statetask, bstp_notify_state, bp);
2351 BSTP_TASK_INIT(&bp->bp_rtagetask, bstp_notify_rtage, bp);
2352
2353 /* Init state */
2354 bp->bp_infois = BSTP_INFO_DISABLED;
2355 bp->bp_flags = BSTP_PORT_AUTOEDGE | BSTP_PORT_AUTOPTP;
2356 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
2357 bstp_set_port_proto(bp, bs->bs_protover);
2358 bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
2359 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
2360 bp->bp_path_cost = bstp_calc_path_cost(bp);
2361 BSTP_UNLOCK(bs);
2362 return 0;
2363 }
2364
2365 int
2366 bstp_enable(struct bstp_port *bp)
2367 {
2368 struct bstp_state *bs = bp->bp_bs;
2369 struct ifnet *ifp = bp->bp_ifp;
2370
2371 KASSERT(bp->bp_active == 0, ("already a bstp member"));
2372
2373 switch (ifp->if_type) {
2374 case IFT_ETHER: /* These can do spanning tree. */
2375 break;
2376 default:
2377 /* Nothing else can. */
2378 return EINVAL;
2379 }
2380
2381 BSTP_LOCK(bs);
2382 LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next);
2383 bp->bp_active = 1;
2384 bp->bp_flags |= BSTP_PORT_NEWINFO;
2385 bstp_reinit(bs);
2386 bstp_update_roles(bs, bp);
2387 BSTP_UNLOCK(bs);
2388 return 0;
2389 }
2390
2391 void
2392 bstp_disable(struct bstp_port *bp)
2393 {
2394 struct bstp_state *bs = bp->bp_bs;
2395
2396 KASSERT(bp->bp_active == 1, ("not a bstp member"));
2397
2398 BSTP_LOCK(bs);
2399 bstp_disable_port(bs, bp);
2400 LIST_REMOVE(bp, bp_next);
2401 bp->bp_active = 0;
2402 bstp_reinit(bs);
2403 BSTP_UNLOCK(bs);
2404 }
2405
2406 /*
2407 * The bstp_port structure is about to be freed by the parent bridge.
2408 */
2409 void
2410 bstp_destroy(struct bstp_port *bp)
2411 {
2412 KASSERT(bp->bp_active == 0, ("port is still attached"));
2413 bstp_task_drain(&bp->bp_statetask);
2414 bstp_task_drain(&bp->bp_rtagetask);
2415 }
2416
2417
2418 __private_extern__ void
2419 bstp_sys_init(void)
2420 {
2421 lck_grp_attr_t *lck_grp_attr = NULL;
2422
2423 lck_grp_attr = lck_grp_attr_alloc_init();
2424 bstp_lock_grp = lck_grp_alloc_init("bstp", lck_grp_attr);
2425 bstp_lock_attr = lck_attr_alloc_init();
2426 #if BRIDGE_DEBUG
2427 lck_attr_setdebug(bstp_lock_attr);
2428 #endif
2429 lck_mtx_init(bstp_list_mtx, bstp_lock_grp, bstp_lock_attr);
2430 lck_grp_attr_free(lck_grp_attr);
2431
2432 LIST_INIT(&bstp_list);
2433
2434 bstp_create_task_thread();
2435 }
2436
2437
2438
2439 static void
2440 bstp_create_task_thread(void)
2441 {
2442 kern_return_t error;
2443
2444 lck_grp_attr_t *lck_grp_attr = NULL;
2445
2446 lck_grp_attr = lck_grp_attr_alloc_init();
2447 bstp_task_grp = lck_grp_alloc_init("bstp_task", lck_grp_attr);
2448 bstp_task_attr = lck_attr_alloc_init();
2449 #if BRIDGE_DEBUG
2450 lck_attr_setdebug(bstp_task_attr);
2451 #endif
2452 lck_mtx_init(bstp_task_mtx, bstp_lock_grp, bstp_lock_attr);
2453 lck_grp_attr_free(lck_grp_attr);
2454
2455 error = kernel_thread_start((thread_continue_t)bstp_task_thread_func, NULL, &bstp_task_thread);
2456 }
2457
2458
2459 static void
2460 bstp_task_thread_func(void)
2461 {
2462 struct bstp_task *bt, *tvar;
2463
2464 lck_mtx_lock(bstp_task_mtx);
2465
2466 do {
2467 while (TAILQ_EMPTY(&bstp_task_queue)) {
2468 wakeup(&bstp_task_queue_running);
2469 msleep(&bstp_task_queue, bstp_task_mtx, PZERO, "bstp_task_queue", NULL);
2470 }
2471
2472 TAILQ_FOREACH_SAFE(bt, &bstp_task_queue, bt_next, tvar) {
2473 int count = bt->bt_count;
2474
2475 bt->bt_count = 0;
2476
2477 bstp_task_queue_running = bt;
2478 lck_mtx_unlock(bstp_task_mtx);
2479
2480 (*bt->bt_func)(bt->bt_context, count);
2481
2482 lck_mtx_lock(bstp_task_mtx);
2483 bstp_task_queue_running = NULL;
2484
2485 if (bt->bt_count == 0) {
2486 TAILQ_REMOVE(&bstp_task_queue, bt, bt_next);
2487 }
2488 }
2489 } while (1);
2490
2491 /* UNREACHED */
2492 }
2493
2494 static void
2495 bstp_task_enqueue(struct bstp_task *bt)
2496 {
2497 lck_mtx_lock(bstp_task_mtx);
2498
2499 if (bt->bt_count) {
2500 bt->bt_count++;
2501 lck_mtx_unlock(bstp_task_mtx);
2502 wakeup(&bstp_task_queue);
2503 return;
2504 }
2505
2506 bt->bt_count = 1;
2507 TAILQ_INSERT_TAIL(&bstp_task_queue, bt, bt_next);
2508
2509 lck_mtx_unlock(bstp_task_mtx);
2510
2511 wakeup(&bstp_task_queue);
2512 }
2513
2514 static void
2515 bstp_task_drain(struct bstp_task *bt)
2516 {
2517 lck_mtx_lock(bstp_task_mtx);
2518
2519 while (bt->bt_count != 0 || bstp_task_queue_running == bt) {
2520 wakeup(&bstp_task_queue);
2521 msleep(&bstp_task_queue_running, bstp_task_mtx, PZERO, "bstp_task_queue", NULL);
2522 }
2523 lck_mtx_unlock(bstp_task_mtx);
2524 }
mirror of XNU