1 /* $NetBSD: bridgestp.c,v 1.5 2003/11/28 08:56:48 keihan 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 __FBSDID("$FreeBSD$"); 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/mbuf.h> 48 #include <sys/socket.h> 49 #include <sys/sockio.h> 50 #include <sys/kernel.h> 51 #include <sys/callout.h> 52 #include <sys/module.h> 53 #include <sys/proc.h> 54 #include <sys/lock.h> 55 #include <sys/mutex.h> 56 #include <sys/taskqueue.h> 57 58 #include <net/if.h> 59 #include <net/if_dl.h> 60 #include <net/if_types.h> 61 #include <net/if_llc.h> 62 #include <net/if_media.h> 63 64 #include <netinet/in.h> 65 #include <netinet/in_systm.h> 66 #include <netinet/in_var.h> 67 #include <netinet/if_ether.h> 68 #include <net/bridgestp.h> 69 70 const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; 71 72 LIST_HEAD(, bstp_state) bstp_list; 73 static struct mtx bstp_list_mtx; 74 75 static void bstp_initialize_port(struct bstp_state *, 76 struct bstp_port *); 77 static void bstp_ifupdstatus(struct bstp_state *, struct bstp_port *); 78 static void bstp_enable_port(struct bstp_state *, struct bstp_port *); 79 static void bstp_disable_port(struct bstp_state *, 80 struct bstp_port *); 81 #ifdef notused 82 static void bstp_enable_change_detection(struct bstp_port *); 83 static void bstp_disable_change_detection(struct bstp_port *); 84 #endif /* notused */ 85 static int bstp_root_bridge(struct bstp_state *bs); 86 static int bstp_supersedes_port_info(struct bstp_state *, 87 struct bstp_port *, struct bstp_config_unit *); 88 static int bstp_designated_port(struct bstp_state *, 89 struct bstp_port *); 90 static int bstp_designated_for_some_port(struct bstp_state *); 91 static void bstp_transmit_config(struct bstp_state *, 92 struct bstp_port *); 93 static void bstp_transmit_tcn(struct bstp_state *); 94 static void bstp_received_config_bpdu(struct bstp_state *, 95 struct bstp_port *, struct bstp_config_unit *); 96 static void bstp_received_tcn_bpdu(struct bstp_state *, 97 struct bstp_port *, struct bstp_tcn_unit *); 98 static void bstp_record_config_information(struct bstp_state *, 99 struct bstp_port *, struct bstp_config_unit *); 100 static void bstp_record_config_timeout_values(struct bstp_state *, 101 struct bstp_config_unit *); 102 static void bstp_config_bpdu_generation(struct bstp_state *); 103 static void bstp_send_config_bpdu(struct bstp_state *, 104 struct bstp_port *, struct bstp_config_unit *); 105 static void bstp_configuration_update(struct bstp_state *); 106 static void bstp_root_selection(struct bstp_state *); 107 static void bstp_designated_port_selection(struct bstp_state *); 108 static void bstp_become_designated_port(struct bstp_state *, 109 struct bstp_port *); 110 static void bstp_port_state_selection(struct bstp_state *); 111 static void bstp_make_forwarding(struct bstp_state *, 112 struct bstp_port *); 113 static void bstp_make_blocking(struct bstp_state *, 114 struct bstp_port *); 115 static void bstp_set_port_state(struct bstp_port *, uint8_t); 116 static void bstp_state_change(void *, int); 117 static void bstp_update_forward_transitions(struct bstp_port *); 118 #ifdef notused 119 static void bstp_set_bridge_priority(struct bstp_state *, uint64_t); 120 static void bstp_set_port_priority(struct bstp_state *, 121 struct bstp_port *, uint16_t); 122 static void bstp_set_path_cost(struct bstp_state *, 123 struct bstp_port *, uint32_t); 124 #endif /* notused */ 125 static void bstp_topology_change_detection(struct bstp_state *); 126 static void bstp_topology_change_acknowledged(struct bstp_state *); 127 static void bstp_acknowledge_topology_change(struct bstp_state *, 128 struct bstp_port *); 129 130 static void bstp_enqueue(struct ifnet *, struct mbuf *); 131 static void bstp_tick(void *); 132 static void bstp_timer_start(struct bstp_timer *, uint16_t); 133 static void bstp_timer_stop(struct bstp_timer *); 134 static int bstp_timer_expired(struct bstp_timer *, uint16_t); 135 136 static void bstp_hold_timer_expiry(struct bstp_state *, 137 struct bstp_port *); 138 static void bstp_message_age_timer_expiry(struct bstp_state *, 139 struct bstp_port *); 140 static void bstp_forward_delay_timer_expiry(struct bstp_state *, 141 struct bstp_port *); 142 static void bstp_topology_change_timer_expiry(struct bstp_state *); 143 static void bstp_tcn_timer_expiry(struct bstp_state *); 144 static void bstp_hello_timer_expiry(struct bstp_state *); 145 static int bstp_addr_cmp(const uint8_t *, const uint8_t *); 146 147 static void 148 bstp_transmit_config(struct bstp_state *bs, struct bstp_port *bp) 149 { 150 BSTP_LOCK_ASSERT(bs); 151 152 if (bp->bp_hold_timer.active) { 153 bp->bp_config_pending = 1; 154 return; 155 } 156 157 bp->bp_config_bpdu.cu_message_type = BSTP_MSGTYPE_CFG; 158 bp->bp_config_bpdu.cu_rootid = bs->bs_designated_root; 159 bp->bp_config_bpdu.cu_root_path_cost = bs->bs_root_path_cost; 160 bp->bp_config_bpdu.cu_bridge_id = bs->bs_bridge_id; 161 bp->bp_config_bpdu.cu_port_id = bp->bp_port_id; 162 163 if (bstp_root_bridge(bs)) 164 bp->bp_config_bpdu.cu_message_age = 0; 165 else 166 bp->bp_config_bpdu.cu_message_age = 167 bs->bs_root_port->bp_message_age_timer.value + 168 BSTP_MESSAGE_AGE_INCR; 169 170 bp->bp_config_bpdu.cu_max_age = bs->bs_max_age; 171 bp->bp_config_bpdu.cu_hello_time = bs->bs_hello_time; 172 bp->bp_config_bpdu.cu_forward_delay = bs->bs_forward_delay; 173 bp->bp_config_bpdu.cu_topology_change_acknowledgment 174 = bp->bp_topology_change_acknowledge; 175 bp->bp_config_bpdu.cu_topology_change = bs->bs_topology_change; 176 177 if (bp->bp_config_bpdu.cu_message_age < bs->bs_max_age) { 178 bp->bp_topology_change_acknowledge = 0; 179 bp->bp_config_pending = 0; 180 bstp_send_config_bpdu(bs, bp, &bp->bp_config_bpdu); 181 bstp_timer_start(&bp->bp_hold_timer, 0); 182 } 183 } 184 185 static void 186 bstp_send_config_bpdu(struct bstp_state *bs, struct bstp_port *bp, 187 struct bstp_config_unit *cu) 188 { 189 struct ifnet *ifp; 190 struct mbuf *m; 191 struct ether_header *eh; 192 struct bstp_cbpdu bpdu; 193 194 BSTP_LOCK_ASSERT(bs); 195 196 ifp = bp->bp_ifp; 197 198 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 199 return; 200 201 MGETHDR(m, M_DONTWAIT, MT_DATA); 202 if (m == NULL) 203 return; 204 205 eh = mtod(m, struct ether_header *); 206 207 m->m_pkthdr.rcvif = ifp; 208 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); 209 m->m_len = m->m_pkthdr.len; 210 211 bpdu.cbu_ssap = bpdu.cbu_dsap = LLC_8021D_LSAP; 212 bpdu.cbu_ctl = LLC_UI; 213 bpdu.cbu_protoid = htons(0); 214 bpdu.cbu_protover = 0; 215 bpdu.cbu_bpdutype = cu->cu_message_type; 216 bpdu.cbu_flags = (cu->cu_topology_change ? BSTP_FLAG_TC : 0) | 217 (cu->cu_topology_change_acknowledgment ? BSTP_FLAG_TCA : 0); 218 219 bpdu.cbu_rootpri = htons(cu->cu_rootid >> 48); 220 bpdu.cbu_rootaddr[0] = cu->cu_rootid >> 40; 221 bpdu.cbu_rootaddr[1] = cu->cu_rootid >> 32; 222 bpdu.cbu_rootaddr[2] = cu->cu_rootid >> 24; 223 bpdu.cbu_rootaddr[3] = cu->cu_rootid >> 16; 224 bpdu.cbu_rootaddr[4] = cu->cu_rootid >> 8; 225 bpdu.cbu_rootaddr[5] = cu->cu_rootid >> 0; 226 227 bpdu.cbu_rootpathcost = htonl(cu->cu_root_path_cost); 228 229 bpdu.cbu_bridgepri = htons(cu->cu_bridge_id >> 48); 230 bpdu.cbu_bridgeaddr[0] = cu->cu_bridge_id >> 40; 231 bpdu.cbu_bridgeaddr[1] = cu->cu_bridge_id >> 32; 232 bpdu.cbu_bridgeaddr[2] = cu->cu_bridge_id >> 24; 233 bpdu.cbu_bridgeaddr[3] = cu->cu_bridge_id >> 16; 234 bpdu.cbu_bridgeaddr[4] = cu->cu_bridge_id >> 8; 235 bpdu.cbu_bridgeaddr[5] = cu->cu_bridge_id >> 0; 236 237 bpdu.cbu_portid = htons(cu->cu_port_id); 238 bpdu.cbu_messageage = htons(cu->cu_message_age); 239 bpdu.cbu_maxage = htons(cu->cu_max_age); 240 bpdu.cbu_hellotime = htons(cu->cu_hello_time); 241 bpdu.cbu_forwarddelay = htons(cu->cu_forward_delay); 242 243 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); 244 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 245 eh->ether_type = htons(sizeof(bpdu)); 246 247 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu)); 248 249 bstp_enqueue(ifp, m); 250 } 251 252 static int 253 bstp_root_bridge(struct bstp_state *bs) 254 { 255 return (bs->bs_designated_root == bs->bs_bridge_id); 256 } 257 258 static int 259 bstp_supersedes_port_info(struct bstp_state *bs, struct bstp_port *bp, 260 struct bstp_config_unit *cu) 261 { 262 if (cu->cu_rootid < bp->bp_designated_root) 263 return (1); 264 if (cu->cu_rootid > bp->bp_designated_root) 265 return (0); 266 267 if (cu->cu_root_path_cost < bp->bp_designated_cost) 268 return (1); 269 if (cu->cu_root_path_cost > bp->bp_designated_cost) 270 return (0); 271 272 if (cu->cu_bridge_id < bp->bp_designated_bridge) 273 return (1); 274 if (cu->cu_bridge_id > bp->bp_designated_bridge) 275 return (0); 276 277 if (bs->bs_bridge_id != cu->cu_bridge_id) 278 return (1); 279 if (cu->cu_port_id <= bp->bp_designated_port) 280 return (1); 281 return (0); 282 } 283 284 static void 285 bstp_record_config_information(struct bstp_state *bs, 286 struct bstp_port *bp, struct bstp_config_unit *cu) 287 { 288 BSTP_LOCK_ASSERT(bs); 289 290 bp->bp_designated_root = cu->cu_rootid; 291 bp->bp_designated_cost = cu->cu_root_path_cost; 292 bp->bp_designated_bridge = cu->cu_bridge_id; 293 bp->bp_designated_port = cu->cu_port_id; 294 bstp_timer_start(&bp->bp_message_age_timer, cu->cu_message_age); 295 } 296 297 static void 298 bstp_record_config_timeout_values(struct bstp_state *bs, 299 struct bstp_config_unit *config) 300 { 301 BSTP_LOCK_ASSERT(bs); 302 303 bs->bs_max_age = config->cu_max_age; 304 bs->bs_hello_time = config->cu_hello_time; 305 bs->bs_forward_delay = config->cu_forward_delay; 306 bs->bs_topology_change = config->cu_topology_change; 307 } 308 309 static void 310 bstp_config_bpdu_generation(struct bstp_state *bs) 311 { 312 struct bstp_port *bp; 313 314 BSTP_LOCK_ASSERT(bs); 315 316 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 317 if (bstp_designated_port(bs, bp) && 318 (bp->bp_state != BSTP_IFSTATE_DISABLED)) 319 bstp_transmit_config(bs, bp); 320 } 321 } 322 323 static int 324 bstp_designated_port(struct bstp_state *bs, struct bstp_port *bp) 325 { 326 return ((bp->bp_designated_bridge == bs->bs_bridge_id) 327 && (bp->bp_designated_port == bp->bp_port_id)); 328 } 329 330 static void 331 bstp_transmit_tcn(struct bstp_state *bs) 332 { 333 struct bstp_tbpdu bpdu; 334 struct bstp_port *bp = bs->bs_root_port; 335 struct ifnet *ifp = bp->bp_ifp; 336 struct ether_header *eh; 337 struct mbuf *m; 338 339 BSTP_LOCK_ASSERT(bs); 340 341 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 342 return; 343 344 MGETHDR(m, M_DONTWAIT, MT_DATA); 345 if (m == NULL) 346 return; 347 348 m->m_pkthdr.rcvif = ifp; 349 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); 350 m->m_len = m->m_pkthdr.len; 351 352 eh = mtod(m, struct ether_header *); 353 354 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); 355 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 356 eh->ether_type = htons(sizeof(bpdu)); 357 358 bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP; 359 bpdu.tbu_ctl = LLC_UI; 360 bpdu.tbu_protoid = 0; 361 bpdu.tbu_protover = 0; 362 bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN; 363 364 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu)); 365 366 bstp_enqueue(ifp, m); 367 } 368 369 static void 370 bstp_configuration_update(struct bstp_state *bs) 371 { 372 BSTP_LOCK_ASSERT(bs); 373 374 bstp_root_selection(bs); 375 bstp_designated_port_selection(bs); 376 } 377 378 static void 379 bstp_root_selection(struct bstp_state *bs) 380 { 381 struct bstp_port *root_port = NULL, *bp; 382 383 BSTP_LOCK_ASSERT(bs); 384 385 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 386 if (bstp_designated_port(bs, bp)) 387 continue; 388 if (bp->bp_state == BSTP_IFSTATE_DISABLED) 389 continue; 390 if (bp->bp_designated_root >= bs->bs_bridge_id) 391 continue; 392 if (root_port == NULL) 393 goto set_port; 394 395 if (bp->bp_designated_root < root_port->bp_designated_root) 396 goto set_port; 397 if (bp->bp_designated_root > root_port->bp_designated_root) 398 continue; 399 400 if ((bp->bp_designated_cost + bp->bp_path_cost) < 401 (root_port->bp_designated_cost + root_port->bp_path_cost)) 402 goto set_port; 403 if ((bp->bp_designated_cost + bp->bp_path_cost) > 404 (root_port->bp_designated_cost + root_port->bp_path_cost)) 405 continue; 406 407 if (bp->bp_designated_bridge < 408 root_port->bp_designated_bridge) 409 goto set_port; 410 if (bp->bp_designated_bridge > 411 root_port->bp_designated_bridge) 412 continue; 413 414 if (bp->bp_designated_port < root_port->bp_designated_port) 415 goto set_port; 416 if (bp->bp_designated_port > root_port->bp_designated_port) 417 continue; 418 419 if (bp->bp_port_id >= root_port->bp_port_id) 420 continue; 421 set_port: 422 root_port = bp; 423 } 424 425 bs->bs_root_port = root_port; 426 if (root_port == NULL) { 427 bs->bs_designated_root = bs->bs_bridge_id; 428 bs->bs_root_path_cost = 0; 429 } else { 430 bs->bs_designated_root = root_port->bp_designated_root; 431 bs->bs_root_path_cost = root_port->bp_designated_cost + 432 root_port->bp_path_cost; 433 } 434 } 435 436 static void 437 bstp_designated_port_selection(struct bstp_state *bs) 438 { 439 struct bstp_port *bp; 440 441 BSTP_LOCK_ASSERT(bs); 442 443 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 444 if (bstp_designated_port(bs, bp)) 445 goto designated; 446 if (bp->bp_designated_root != bs->bs_designated_root) 447 goto designated; 448 449 if (bs->bs_root_path_cost < bp->bp_designated_cost) 450 goto designated; 451 if (bs->bs_root_path_cost > bp->bp_designated_cost) 452 continue; 453 454 if (bs->bs_bridge_id < bp->bp_designated_bridge) 455 goto designated; 456 if (bs->bs_bridge_id > bp->bp_designated_bridge) 457 continue; 458 459 if (bp->bp_port_id > bp->bp_designated_port) 460 continue; 461 designated: 462 bstp_become_designated_port(bs, bp); 463 } 464 } 465 466 static void 467 bstp_become_designated_port(struct bstp_state *bs, struct bstp_port *bp) 468 { 469 BSTP_LOCK_ASSERT(bs); 470 471 bp->bp_designated_root = bs->bs_designated_root; 472 bp->bp_designated_cost = bs->bs_root_path_cost; 473 bp->bp_designated_bridge = bs->bs_bridge_id; 474 bp->bp_designated_port = bp->bp_port_id; 475 } 476 477 static void 478 bstp_port_state_selection(struct bstp_state *bs) 479 { 480 struct bstp_port *bp; 481 482 BSTP_LOCK_ASSERT(bs); 483 484 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 485 if (bp == bs->bs_root_port) { 486 bp->bp_config_pending = 0; 487 bp->bp_topology_change_acknowledge = 0; 488 bstp_make_forwarding(bs, bp); 489 } else if (bstp_designated_port(bs, bp)) { 490 bstp_timer_stop(&bp->bp_message_age_timer); 491 bstp_make_forwarding(bs, bp); 492 } else { 493 bp->bp_config_pending = 0; 494 bp->bp_topology_change_acknowledge = 0; 495 bstp_make_blocking(bs, bp); 496 } 497 } 498 } 499 500 static void 501 bstp_make_forwarding(struct bstp_state *bs, struct bstp_port *bp) 502 { 503 BSTP_LOCK_ASSERT(bs); 504 505 if (bp->bp_state == BSTP_IFSTATE_BLOCKING) { 506 bstp_set_port_state(bp, BSTP_IFSTATE_LISTENING); 507 bstp_timer_start(&bp->bp_forward_delay_timer, 0); 508 } 509 } 510 511 static void 512 bstp_make_blocking(struct bstp_state *bs, struct bstp_port *bp) 513 { 514 BSTP_LOCK_ASSERT(bs); 515 516 if ((bp->bp_state != BSTP_IFSTATE_DISABLED) && 517 (bp->bp_state != BSTP_IFSTATE_BLOCKING)) { 518 if ((bp->bp_state == BSTP_IFSTATE_FORWARDING) || 519 (bp->bp_state == BSTP_IFSTATE_LEARNING)) { 520 if (bp->bp_change_detection_enabled) { 521 bstp_topology_change_detection(bs); 522 } 523 } 524 bstp_set_port_state(bp, BSTP_IFSTATE_BLOCKING); 525 bstp_timer_stop(&bp->bp_forward_delay_timer); 526 } 527 } 528 529 static void 530 bstp_set_port_state(struct bstp_port *bp, uint8_t state) 531 { 532 struct bstp_state *bs = bp->bp_bs; 533 534 bp->bp_state = state; 535 536 /* notify the parent bridge */ 537 if (bs->bs_state_cb != NULL) 538 taskqueue_enqueue(taskqueue_swi, &bp->bp_statetask); 539 } 540 541 /* 542 * Notify the bridge that a port state has changed, we need to do this from a 543 * taskqueue to avoid a LOR. 544 */ 545 static void 546 bstp_state_change(void *arg, int pending) 547 { 548 struct bstp_port *bp = (struct bstp_port *)arg; 549 struct bstp_state *bs = bp->bp_bs; 550 551 if (bp->bp_active == 1) 552 (*bs->bs_state_cb)(bp->bp_ifp, bp->bp_state); 553 } 554 555 static void 556 bstp_update_forward_transitions(struct bstp_port *bp) 557 { 558 bp->bp_forward_transitions++; 559 } 560 561 static void 562 bstp_topology_change_detection(struct bstp_state *bs) 563 { 564 BSTP_LOCK_ASSERT(bs); 565 566 if (bstp_root_bridge(bs)) { 567 bs->bs_topology_change = 1; 568 bstp_timer_start(&bs->bs_topology_change_timer, 0); 569 } else if (!bs->bs_topology_change_detected) { 570 bstp_transmit_tcn(bs); 571 bstp_timer_start(&bs->bs_tcn_timer, 0); 572 } 573 bs->bs_topology_change_detected = 1; 574 getmicrotime(&bs->bs_last_tc_time); 575 } 576 577 static void 578 bstp_topology_change_acknowledged(struct bstp_state *bs) 579 { 580 BSTP_LOCK_ASSERT(bs); 581 582 bs->bs_topology_change_detected = 0; 583 bstp_timer_stop(&bs->bs_tcn_timer); 584 } 585 586 static void 587 bstp_acknowledge_topology_change(struct bstp_state *bs, 588 struct bstp_port *bp) 589 { 590 BSTP_LOCK_ASSERT(bs); 591 592 bp->bp_topology_change_acknowledge = 1; 593 bstp_transmit_config(bs, bp); 594 } 595 596 struct mbuf * 597 bstp_input(struct bstp_port *bp, struct ifnet *ifp, struct mbuf *m) 598 { 599 struct bstp_state *bs = bp->bp_bs; 600 struct ether_header *eh; 601 struct bstp_tbpdu tpdu; 602 struct bstp_cbpdu cpdu; 603 struct bstp_config_unit cu; 604 struct bstp_tcn_unit tu; 605 uint16_t len; 606 607 if (bp->bp_active == 0) { 608 m_freem(m); 609 return (NULL); 610 } 611 612 BSTP_LOCK(bs); 613 614 eh = mtod(m, struct ether_header *); 615 616 len = ntohs(eh->ether_type); 617 if (len < sizeof(tpdu)) 618 goto out; 619 620 m_adj(m, ETHER_HDR_LEN); 621 622 if (m->m_pkthdr.len > len) 623 m_adj(m, len - m->m_pkthdr.len); 624 if (m->m_len < sizeof(tpdu) && 625 (m = m_pullup(m, sizeof(tpdu))) == NULL) 626 goto out; 627 628 memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu)); 629 630 if (tpdu.tbu_dsap != LLC_8021D_LSAP || 631 tpdu.tbu_ssap != LLC_8021D_LSAP || 632 tpdu.tbu_ctl != LLC_UI) 633 goto out; 634 if (tpdu.tbu_protoid != 0 || tpdu.tbu_protover != 0) 635 goto out; 636 637 switch (tpdu.tbu_bpdutype) { 638 case BSTP_MSGTYPE_TCN: 639 tu.tu_message_type = tpdu.tbu_bpdutype; 640 bstp_received_tcn_bpdu(bs, bp, &tu); 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, caddr_t), 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 bstp_received_config_bpdu(bs, bp, &cu); 678 break; 679 default: 680 goto out; 681 } 682 683 out: 684 BSTP_UNLOCK(bs); 685 if (m) 686 m_freem(m); 687 return (NULL); 688 } 689 690 static void 691 bstp_received_config_bpdu(struct bstp_state *bs, struct bstp_port *bp, 692 struct bstp_config_unit *cu) 693 { 694 int root; 695 696 BSTP_LOCK_ASSERT(bs); 697 698 root = bstp_root_bridge(bs); 699 700 if (bp->bp_state != BSTP_IFSTATE_DISABLED) { 701 if (bstp_supersedes_port_info(bs, bp, cu)) { 702 bstp_record_config_information(bs, bp, cu); 703 bstp_configuration_update(bs); 704 bstp_port_state_selection(bs); 705 706 if ((bstp_root_bridge(bs) == 0) && root) { 707 bstp_timer_stop(&bs->bs_hello_timer); 708 709 if (bs->bs_topology_change_detected) { 710 bstp_timer_stop( 711 &bs->bs_topology_change_timer); 712 bstp_transmit_tcn(bs); 713 bstp_timer_start(&bs->bs_tcn_timer, 0); 714 } 715 } 716 717 if (bp == bs->bs_root_port) { 718 bstp_record_config_timeout_values(bs, cu); 719 bstp_config_bpdu_generation(bs); 720 721 if (cu->cu_topology_change_acknowledgment) 722 bstp_topology_change_acknowledged(bs); 723 } 724 } else if (bstp_designated_port(bs, bp)) 725 bstp_transmit_config(bs, bp); 726 } 727 } 728 729 static void 730 bstp_received_tcn_bpdu(struct bstp_state *bs, struct bstp_port *bp, 731 struct bstp_tcn_unit *tcn) 732 { 733 if (bp->bp_state != BSTP_IFSTATE_DISABLED && 734 bstp_designated_port(bs, bp)) { 735 bstp_topology_change_detection(bs); 736 bstp_acknowledge_topology_change(bs, bp); 737 } 738 } 739 740 static void 741 bstp_hello_timer_expiry(struct bstp_state *bs) 742 { 743 bstp_config_bpdu_generation(bs); 744 bstp_timer_start(&bs->bs_hello_timer, 0); 745 } 746 747 static void 748 bstp_message_age_timer_expiry(struct bstp_state *bs, 749 struct bstp_port *bp) 750 { 751 int root; 752 753 BSTP_LOCK_ASSERT(bs); 754 755 root = bstp_root_bridge(bs); 756 bstp_become_designated_port(bs, bp); 757 bstp_configuration_update(bs); 758 bstp_port_state_selection(bs); 759 760 if ((bstp_root_bridge(bs)) && (root == 0)) { 761 bs->bs_max_age = bs->bs_bridge_max_age; 762 bs->bs_hello_time = bs->bs_bridge_hello_time; 763 bs->bs_forward_delay = bs->bs_bridge_forward_delay; 764 765 bstp_topology_change_detection(bs); 766 bstp_timer_stop(&bs->bs_tcn_timer); 767 bstp_config_bpdu_generation(bs); 768 bstp_timer_start(&bs->bs_hello_timer, 0); 769 } 770 } 771 772 static void 773 bstp_forward_delay_timer_expiry(struct bstp_state *bs, 774 struct bstp_port *bp) 775 { 776 if (bp->bp_state == BSTP_IFSTATE_LISTENING) { 777 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 778 bstp_timer_start(&bp->bp_forward_delay_timer, 0); 779 } else if (bp->bp_state == BSTP_IFSTATE_LEARNING) { 780 bstp_set_port_state(bp, BSTP_IFSTATE_FORWARDING); 781 bstp_update_forward_transitions(bp); 782 if (bstp_designated_for_some_port(bs) && 783 bp->bp_change_detection_enabled) 784 bstp_topology_change_detection(bs); 785 } 786 } 787 788 static int 789 bstp_designated_for_some_port(struct bstp_state *bs) 790 { 791 792 struct bstp_port *bp; 793 794 BSTP_LOCK_ASSERT(bs); 795 796 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 797 if (bp->bp_designated_bridge == bs->bs_bridge_id) 798 return (1); 799 } 800 return (0); 801 } 802 803 static void 804 bstp_tcn_timer_expiry(struct bstp_state *bs) 805 { 806 BSTP_LOCK_ASSERT(bs); 807 808 bstp_transmit_tcn(bs); 809 bstp_timer_start(&bs->bs_tcn_timer, 0); 810 } 811 812 static void 813 bstp_topology_change_timer_expiry(struct bstp_state *bs) 814 { 815 BSTP_LOCK_ASSERT(bs); 816 817 bs->bs_topology_change_detected = 0; 818 bs->bs_topology_change = 0; 819 } 820 821 static void 822 bstp_hold_timer_expiry(struct bstp_state *bs, struct bstp_port *bp) 823 { 824 if (bp->bp_config_pending) 825 bstp_transmit_config(bs, bp); 826 } 827 828 static int 829 bstp_addr_cmp(const uint8_t *a, const uint8_t *b) 830 { 831 int i, d; 832 833 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 834 d = ((int)a[i]) - ((int)b[i]); 835 } 836 837 return (d); 838 } 839 840 void 841 bstp_reinit(struct bstp_state *bs) 842 { 843 struct bstp_port *bp, *mbp; 844 u_char *e_addr; 845 846 BSTP_LOCK(bs); 847 848 mbp = NULL; 849 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 850 bp->bp_port_id = (bp->bp_priority << 8) | 851 (bp->bp_ifp->if_index & 0xff); 852 853 if (mbp == NULL) { 854 mbp = bp; 855 continue; 856 } 857 if (bstp_addr_cmp(IF_LLADDR(bp->bp_ifp), 858 IF_LLADDR(mbp->bp_ifp)) < 0) { 859 mbp = bp; 860 continue; 861 } 862 } 863 if (mbp == NULL) { 864 BSTP_UNLOCK(bs); 865 bstp_stop(bs); 866 return; 867 } 868 869 e_addr = IF_LLADDR(mbp->bp_ifp); 870 bs->bs_bridge_id = 871 (((uint64_t)bs->bs_bridge_priority) << 48) | 872 (((uint64_t)e_addr[0]) << 40) | 873 (((uint64_t)e_addr[1]) << 32) | 874 (((uint64_t)e_addr[2]) << 24) | 875 (((uint64_t)e_addr[3]) << 16) | 876 (((uint64_t)e_addr[4]) << 8) | 877 (((uint64_t)e_addr[5])); 878 879 bs->bs_designated_root = bs->bs_bridge_id; 880 bs->bs_root_path_cost = 0; 881 bs->bs_root_port = NULL; 882 883 bs->bs_max_age = bs->bs_bridge_max_age; 884 bs->bs_hello_time = bs->bs_bridge_hello_time; 885 bs->bs_forward_delay = bs->bs_bridge_forward_delay; 886 bs->bs_topology_change_detected = 0; 887 bs->bs_topology_change = 0; 888 bstp_timer_stop(&bs->bs_tcn_timer); 889 bstp_timer_stop(&bs->bs_topology_change_timer); 890 891 if (callout_pending(&bs->bs_bstpcallout) == 0) 892 callout_reset(&bs->bs_bstpcallout, hz, 893 bstp_tick, bs); 894 895 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 896 bstp_ifupdstatus(bs, bp); 897 898 getmicrotime(&bs->bs_last_tc_time); 899 bstp_port_state_selection(bs); 900 bstp_config_bpdu_generation(bs); 901 bstp_timer_start(&bs->bs_hello_timer, 0); 902 bstp_timer_start(&bs->bs_link_timer, 0); 903 BSTP_UNLOCK(bs); 904 } 905 906 static int 907 bstp_modevent(module_t mod, int type, void *data) 908 { 909 910 switch (type) { 911 case MOD_LOAD: 912 mtx_init(&bstp_list_mtx, "bridgestp list", NULL, MTX_DEF); 913 LIST_INIT(&bstp_list); 914 bstp_linkstate_p = bstp_linkstate; 915 break; 916 case MOD_UNLOAD: 917 mtx_destroy(&bstp_list_mtx); 918 break; 919 default: 920 return (EOPNOTSUPP); 921 } 922 return (0); 923 } 924 925 static moduledata_t bstp_mod = { 926 "bridgestp", 927 bstp_modevent, 928 0 929 }; 930 931 DECLARE_MODULE(bridgestp, bstp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 932 933 void 934 bstp_attach(struct bstp_state *bs, bstp_state_cb_t state_callback) 935 { 936 BSTP_LOCK_INIT(bs); 937 callout_init_mtx(&bs->bs_bstpcallout, &bs->bs_mtx, 0); 938 LIST_INIT(&bs->bs_bplist); 939 940 bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 941 bs->bs_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 942 bs->bs_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 943 bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 944 bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME; 945 bs->bs_state_cb = state_callback; 946 947 mtx_lock(&bstp_list_mtx); 948 LIST_INSERT_HEAD(&bstp_list, bs, bs_list); 949 mtx_unlock(&bstp_list_mtx); 950 } 951 952 void 953 bstp_detach(struct bstp_state *bs) 954 { 955 KASSERT(LIST_EMPTY(&bs->bs_bplist), ("bstp still active")); 956 957 mtx_lock(&bstp_list_mtx); 958 LIST_REMOVE(bs, bs_list); 959 mtx_unlock(&bstp_list_mtx); 960 BSTP_LOCK_DESTROY(bs); 961 } 962 963 void 964 bstp_init(struct bstp_state *bs) 965 { 966 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 967 bstp_reinit(bs); 968 } 969 970 void 971 bstp_stop(struct bstp_state *bs) 972 { 973 struct bstp_port *bp; 974 975 BSTP_LOCK(bs); 976 977 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 978 bstp_set_port_state(bp, BSTP_IFSTATE_DISABLED); 979 bstp_timer_stop(&bp->bp_hold_timer); 980 bstp_timer_stop(&bp->bp_message_age_timer); 981 bstp_timer_stop(&bp->bp_forward_delay_timer); 982 } 983 984 callout_drain(&bs->bs_bstpcallout); 985 callout_stop(&bs->bs_bstpcallout); 986 987 bstp_timer_stop(&bs->bs_topology_change_timer); 988 bstp_timer_stop(&bs->bs_tcn_timer); 989 bstp_timer_stop(&bs->bs_hello_timer); 990 991 BSTP_UNLOCK(bs); 992 } 993 994 static void 995 bstp_initialize_port(struct bstp_state *bs, struct bstp_port *bp) 996 { 997 BSTP_LOCK_ASSERT(bs); 998 999 bstp_become_designated_port(bs, bp); 1000 bstp_set_port_state(bp, BSTP_IFSTATE_BLOCKING); 1001 bp->bp_topology_change_acknowledge = 0; 1002 bp->bp_config_pending = 0; 1003 bp->bp_change_detection_enabled = 1; 1004 bstp_timer_stop(&bp->bp_message_age_timer); 1005 bstp_timer_stop(&bp->bp_forward_delay_timer); 1006 bstp_timer_stop(&bp->bp_hold_timer); 1007 } 1008 1009 static void 1010 bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp) 1011 { 1012 bstp_initialize_port(bs, bp); 1013 bstp_port_state_selection(bs); 1014 } 1015 1016 static void 1017 bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp) 1018 { 1019 int root; 1020 1021 BSTP_LOCK_ASSERT(bs); 1022 1023 root = bstp_root_bridge(bs); 1024 bstp_become_designated_port(bs, bp); 1025 bstp_set_port_state(bp, BSTP_IFSTATE_DISABLED); 1026 bp->bp_topology_change_acknowledge = 0; 1027 bp->bp_config_pending = 0; 1028 bstp_timer_stop(&bp->bp_message_age_timer); 1029 bstp_timer_stop(&bp->bp_forward_delay_timer); 1030 bstp_configuration_update(bs); 1031 bstp_port_state_selection(bs); 1032 1033 if (bstp_root_bridge(bs) && (root == 0)) { 1034 bs->bs_max_age = bs->bs_bridge_max_age; 1035 bs->bs_hello_time = bs->bs_bridge_hello_time; 1036 bs->bs_forward_delay = bs->bs_bridge_forward_delay; 1037 1038 bstp_topology_change_detection(bs); 1039 bstp_timer_stop(&bs->bs_tcn_timer); 1040 bstp_config_bpdu_generation(bs); 1041 bstp_timer_start(&bs->bs_hello_timer, 0); 1042 } 1043 } 1044 1045 #ifdef notused 1046 static void 1047 bstp_set_bridge_priority(struct bstp_state *bs, uint64_t new_bridge_id) 1048 { 1049 struct bstp_port *bp; 1050 int root; 1051 1052 BSTP_LOCK_ASSERT(bs); 1053 1054 root = bstp_root_bridge(bs); 1055 1056 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1057 if (bstp_designated_port(bs, bp)) 1058 bp->bp_designated_bridge = new_bridge_id; 1059 } 1060 1061 bs->bs_bridge_id = new_bridge_id; 1062 1063 bstp_configuration_update(bs); 1064 bstp_port_state_selection(bs); 1065 1066 if (bstp_root_bridge(bs) && (root == 0)) { 1067 bs->bs_max_age = bs->bs_bridge_max_age; 1068 bs->bs_hello_time = bs->bs_bridge_hello_time; 1069 bs->bs_forward_delay = bs->bs_bridge_forward_delay; 1070 1071 bstp_topology_change_detection(bs); 1072 bstp_timer_stop(&bs->bs_tcn_timer); 1073 bstp_config_bpdu_generation(bs); 1074 bstp_timer_start(&bs->bs_hello_timer, 0); 1075 } 1076 } 1077 1078 static void 1079 bstp_set_port_priority(struct bstp_state *bs, struct bstp_port *bp, 1080 uint16_t new_port_id) 1081 { 1082 if (bstp_designated_port(bs, bp)) 1083 bp->bp_designated_port = new_port_id; 1084 1085 bp->bp_port_id = new_port_id; 1086 1087 if ((bs->bs_bridge_id == bp->bp_designated_bridge) && 1088 (bp->bp_port_id < bp->bp_designated_port)) { 1089 bstp_become_designated_port(bs, bp); 1090 bstp_port_state_selection(bs); 1091 } 1092 } 1093 1094 static void 1095 bstp_set_path_cost(struct bstp_state *bs, struct bstp_port *bp, 1096 uint32_t path_cost) 1097 { 1098 bp->bp_path_cost = path_cost; 1099 bstp_configuration_update(bs); 1100 bstp_port_state_selection(bs); 1101 } 1102 1103 static void 1104 bstp_enable_change_detection(struct bstp_port *bp) 1105 { 1106 bp->bp_change_detection_enabled = 1; 1107 } 1108 1109 static void 1110 bstp_disable_change_detection(struct bstp_port *bp) 1111 { 1112 bp->bp_change_detection_enabled = 0; 1113 } 1114 #endif /* notused */ 1115 1116 static void 1117 bstp_enqueue(struct ifnet *dst_ifp, struct mbuf *m) 1118 { 1119 int err = 0; 1120 1121 IFQ_ENQUEUE(&dst_ifp->if_snd, m, err); 1122 1123 if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0) 1124 (*dst_ifp->if_start)(dst_ifp); 1125 } 1126 1127 void 1128 bstp_linkstate(struct ifnet *ifp, int state) 1129 { 1130 struct bstp_state *bs; 1131 struct bstp_port *bp; 1132 1133 /* 1134 * It would be nice if the ifnet had a pointer to the bstp_port so we 1135 * didnt need to search for it, but that may be an overkill. In reality 1136 * this is fast and doesnt get called often. 1137 */ 1138 mtx_lock(&bstp_list_mtx); 1139 LIST_FOREACH(bs, &bstp_list, bs_list) { 1140 BSTP_LOCK(bs); 1141 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1142 if (bp->bp_ifp == ifp) { 1143 bstp_ifupdstatus(bs, bp); 1144 /* it only exists once so return */ 1145 BSTP_UNLOCK(bs); 1146 mtx_unlock(&bstp_list_mtx); 1147 return; 1148 } 1149 } 1150 BSTP_UNLOCK(bs); 1151 } 1152 mtx_unlock(&bstp_list_mtx); 1153 } 1154 1155 static void 1156 bstp_ifupdstatus(struct bstp_state *bs, struct bstp_port *bp) 1157 { 1158 struct ifnet *ifp = bp->bp_ifp; 1159 struct ifmediareq ifmr; 1160 int error = 0; 1161 1162 BSTP_LOCK_ASSERT(bs); 1163 1164 bzero((char *)&ifmr, sizeof(ifmr)); 1165 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr); 1166 1167 if ((error == 0) && (ifp->if_flags & IFF_UP)) { 1168 if (ifmr.ifm_status & IFM_ACTIVE) { 1169 if (bp->bp_state == BSTP_IFSTATE_DISABLED) 1170 bstp_enable_port(bs, bp); 1171 1172 } else { 1173 if (bp->bp_state != BSTP_IFSTATE_DISABLED) 1174 bstp_disable_port(bs, bp); 1175 } 1176 return; 1177 } 1178 1179 if (bp->bp_state != BSTP_IFSTATE_DISABLED) 1180 bstp_disable_port(bs, bp); 1181 } 1182 1183 static void 1184 bstp_tick(void *arg) 1185 { 1186 struct bstp_state *bs = arg; 1187 struct bstp_port *bp; 1188 1189 BSTP_LOCK_ASSERT(bs); 1190 1191 /* slow timer to catch missed link events */ 1192 if (bstp_timer_expired(&bs->bs_link_timer, BSTP_LINK_TIMER)) { 1193 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1194 bstp_ifupdstatus(bs, bp); 1195 } 1196 bstp_timer_start(&bs->bs_link_timer, 0); 1197 } 1198 1199 if (bstp_timer_expired(&bs->bs_hello_timer, bs->bs_hello_time)) 1200 bstp_hello_timer_expiry(bs); 1201 1202 if (bstp_timer_expired(&bs->bs_tcn_timer, bs->bs_bridge_hello_time)) 1203 bstp_tcn_timer_expiry(bs); 1204 1205 if (bstp_timer_expired(&bs->bs_topology_change_timer, 1206 bs->bs_topology_change_time)) 1207 bstp_topology_change_timer_expiry(bs); 1208 1209 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1210 if (bstp_timer_expired(&bp->bp_message_age_timer, 1211 bs->bs_max_age)) 1212 bstp_message_age_timer_expiry(bs, bp); 1213 } 1214 1215 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1216 if (bstp_timer_expired(&bp->bp_forward_delay_timer, 1217 bs->bs_forward_delay)) 1218 bstp_forward_delay_timer_expiry(bs, bp); 1219 1220 if (bstp_timer_expired(&bp->bp_hold_timer, 1221 bs->bs_hold_time)) 1222 bstp_hold_timer_expiry(bs, bp); 1223 } 1224 1225 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 1226 } 1227 1228 static void 1229 bstp_timer_start(struct bstp_timer *t, uint16_t v) 1230 { 1231 t->value = v; 1232 t->active = 1; 1233 } 1234 1235 static void 1236 bstp_timer_stop(struct bstp_timer *t) 1237 { 1238 t->value = 0; 1239 t->active = 0; 1240 } 1241 1242 static int 1243 bstp_timer_expired(struct bstp_timer *t, uint16_t v) 1244 { 1245 if (t->active == 0) 1246 return (0); 1247 t->value += BSTP_TICK_VAL; 1248 if (t->value >= v) { 1249 bstp_timer_stop(t); 1250 return (1); 1251 } 1252 return (0); 1253 1254 } 1255 1256 int 1257 bstp_add(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *ifp) 1258 { 1259 KASSERT(bp->bp_active == 0, ("already a bstp member")); 1260 1261 switch (ifp->if_type) { 1262 case IFT_ETHER: /* These can do spanning tree. */ 1263 break; 1264 default: 1265 /* Nothing else can. */ 1266 return (EINVAL); 1267 } 1268 1269 BSTP_LOCK(bs); 1270 bp->bp_ifp = ifp; 1271 bp->bp_bs = bs; 1272 bp->bp_active = 1; 1273 bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY; 1274 bp->bp_path_cost = BSTP_DEFAULT_PATH_COST; 1275 1276 LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next); 1277 TASK_INIT(&bp->bp_statetask, 0, bstp_state_change, bp); 1278 BSTP_UNLOCK(bs); 1279 bstp_reinit(bs); 1280 1281 return (0); 1282 } 1283 1284 void 1285 bstp_delete(struct bstp_port *bp) 1286 { 1287 struct bstp_state *bs = bp->bp_bs; 1288 1289 KASSERT(bp->bp_active == 1, ("not a bstp member")); 1290 1291 BSTP_LOCK(bs); 1292 if (bp->bp_state != BSTP_IFSTATE_DISABLED) 1293 bstp_disable_port(bs, bp); 1294 LIST_REMOVE(bp, bp_next); 1295 BSTP_UNLOCK(bs); 1296 bp->bp_bs = NULL; 1297 bp->bp_active = 0; 1298 1299 bstp_reinit(bs); 1300 } 1301 1302 /* 1303 * The bstp_port structure is about to be freed by the parent bridge. 1304 */ 1305 void 1306 bstp_drain(struct bstp_port *bp) 1307 { 1308 KASSERT(bp->bp_active == 0, ("port is still attached")); 1309 taskqueue_drain(taskqueue_swi, &bp->bp_statetask); 1310 } 1311