1 /* $NetBSD: bridgestp.c,v 1.5 2003/11/28 08:56:48 keihan Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD 5 * 6 * Copyright (c) 2000 Jason L. Wright (jason@thought.net) 7 * Copyright (c) 2006 Andrew Thompson (thompsa@FreeBSD.org) 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 22 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 25 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 27 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 28 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 * 31 * OpenBSD: bridgestp.c,v 1.5 2001/03/22 03:48:29 jason Exp 32 */ 33 34 /* 35 * Implementation of the spanning tree protocol as defined in 36 * ISO/IEC 802.1D-2004, June 9, 2004. 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/mbuf.h> 45 #include <sys/socket.h> 46 #include <sys/sockio.h> 47 #include <sys/kernel.h> 48 #include <sys/malloc.h> 49 #include <sys/callout.h> 50 #include <sys/module.h> 51 #include <sys/proc.h> 52 #include <sys/lock.h> 53 #include <sys/mutex.h> 54 #include <sys/taskqueue.h> 55 56 #include <net/if.h> 57 #include <net/if_var.h> 58 #include <net/if_dl.h> 59 #include <net/if_types.h> 60 #include <net/if_llc.h> 61 #include <net/if_media.h> 62 #include <net/vnet.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 #ifdef BRIDGESTP_DEBUG 71 #define DPRINTF(fmt, arg...) printf("bstp: " fmt, ##arg) 72 #else 73 #define DPRINTF(fmt, arg...) (void)0 74 #endif 75 76 #define PV2ADDR(pv, eaddr) do { \ 77 eaddr[0] = pv >> 40; \ 78 eaddr[1] = pv >> 32; \ 79 eaddr[2] = pv >> 24; \ 80 eaddr[3] = pv >> 16; \ 81 eaddr[4] = pv >> 8; \ 82 eaddr[5] = pv >> 0; \ 83 } while (0) 84 85 #define INFO_BETTER 1 86 #define INFO_SAME 0 87 #define INFO_WORSE -1 88 89 const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; 90 91 LIST_HEAD(, bstp_state) bstp_list; 92 static struct mtx bstp_list_mtx; 93 94 static void bstp_transmit(struct bstp_state *, struct bstp_port *); 95 static void bstp_transmit_bpdu(struct bstp_state *, struct bstp_port *); 96 static void bstp_transmit_tcn(struct bstp_state *, struct bstp_port *); 97 static void bstp_decode_bpdu(struct bstp_port *, struct bstp_cbpdu *, 98 struct bstp_config_unit *); 99 static void bstp_send_bpdu(struct bstp_state *, struct bstp_port *, 100 struct bstp_cbpdu *); 101 static int bstp_pdu_flags(struct bstp_port *); 102 static void bstp_received_stp(struct bstp_state *, struct bstp_port *, 103 struct mbuf **, struct bstp_tbpdu *); 104 static void bstp_received_rstp(struct bstp_state *, struct bstp_port *, 105 struct mbuf **, struct bstp_tbpdu *); 106 static void bstp_received_tcn(struct bstp_state *, struct bstp_port *, 107 struct bstp_tcn_unit *); 108 static void bstp_received_bpdu(struct bstp_state *, struct bstp_port *, 109 struct bstp_config_unit *); 110 static int bstp_pdu_rcvtype(struct bstp_port *, struct bstp_config_unit *); 111 static int bstp_pdu_bettersame(struct bstp_port *, int); 112 static int bstp_info_cmp(struct bstp_pri_vector *, 113 struct bstp_pri_vector *); 114 static int bstp_info_superior(struct bstp_pri_vector *, 115 struct bstp_pri_vector *); 116 static void bstp_assign_roles(struct bstp_state *); 117 static void bstp_update_roles(struct bstp_state *, struct bstp_port *); 118 static void bstp_update_state(struct bstp_state *, struct bstp_port *); 119 static void bstp_update_tc(struct bstp_port *); 120 static void bstp_update_info(struct bstp_port *); 121 static void bstp_set_other_tcprop(struct bstp_port *); 122 static void bstp_set_all_reroot(struct bstp_state *); 123 static void bstp_set_all_sync(struct bstp_state *); 124 static void bstp_set_port_state(struct bstp_port *, int); 125 static void bstp_set_port_role(struct bstp_port *, int); 126 static void bstp_set_port_proto(struct bstp_port *, int); 127 static void bstp_set_port_tc(struct bstp_port *, int); 128 static void bstp_set_timer_tc(struct bstp_port *); 129 static void bstp_set_timer_msgage(struct bstp_port *); 130 static int bstp_rerooted(struct bstp_state *, struct bstp_port *); 131 static uint32_t bstp_calc_path_cost(struct bstp_port *); 132 static void bstp_notify_state(void *, int); 133 static void bstp_notify_rtage(void *, int); 134 static void bstp_ifupdstatus(void *, int); 135 static void bstp_enable_port(struct bstp_state *, struct bstp_port *); 136 static void bstp_disable_port(struct bstp_state *, struct bstp_port *); 137 static void bstp_tick(void *); 138 static void bstp_timer_start(struct bstp_timer *, uint16_t); 139 static void bstp_timer_stop(struct bstp_timer *); 140 static void bstp_timer_latch(struct bstp_timer *); 141 static int bstp_timer_dectest(struct bstp_timer *); 142 static void bstp_hello_timer_expiry(struct bstp_state *, 143 struct bstp_port *); 144 static void bstp_message_age_expiry(struct bstp_state *, 145 struct bstp_port *); 146 static void bstp_migrate_delay_expiry(struct bstp_state *, 147 struct bstp_port *); 148 static void bstp_edge_delay_expiry(struct bstp_state *, 149 struct bstp_port *); 150 static int bstp_addr_cmp(const uint8_t *, const uint8_t *); 151 static int bstp_same_bridgeid(uint64_t, uint64_t); 152 static void bstp_reinit(struct bstp_state *); 153 154 static void 155 bstp_transmit(struct bstp_state *bs, struct bstp_port *bp) 156 { 157 if (bs->bs_running == 0) 158 return; 159 160 /* 161 * a PDU can only be sent if we have tx quota left and the 162 * hello timer is running. 163 */ 164 if (bp->bp_hello_timer.active == 0) { 165 /* Test if it needs to be reset */ 166 bstp_hello_timer_expiry(bs, bp); 167 return; 168 } 169 if (bp->bp_txcount > bs->bs_txholdcount) 170 /* Ran out of karma */ 171 return; 172 173 if (bp->bp_protover == BSTP_PROTO_RSTP) { 174 bstp_transmit_bpdu(bs, bp); 175 bp->bp_tc_ack = 0; 176 } else { /* STP */ 177 switch (bp->bp_role) { 178 case BSTP_ROLE_DESIGNATED: 179 bstp_transmit_bpdu(bs, bp); 180 bp->bp_tc_ack = 0; 181 break; 182 183 case BSTP_ROLE_ROOT: 184 bstp_transmit_tcn(bs, bp); 185 break; 186 } 187 } 188 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 189 bp->bp_flags &= ~BSTP_PORT_NEWINFO; 190 } 191 192 static void 193 bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp) 194 { 195 struct bstp_cbpdu bpdu; 196 197 BSTP_LOCK_ASSERT(bs); 198 199 bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48); 200 PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr); 201 202 bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost); 203 204 bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48); 205 PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr); 206 207 bpdu.cbu_portid = htons(bp->bp_port_id); 208 bpdu.cbu_messageage = htons(bp->bp_desg_msg_age); 209 bpdu.cbu_maxage = htons(bp->bp_desg_max_age); 210 bpdu.cbu_hellotime = htons(bp->bp_desg_htime); 211 bpdu.cbu_forwarddelay = htons(bp->bp_desg_fdelay); 212 213 bpdu.cbu_flags = bstp_pdu_flags(bp); 214 215 switch (bp->bp_protover) { 216 case BSTP_PROTO_STP: 217 bpdu.cbu_bpdutype = BSTP_MSGTYPE_CFG; 218 break; 219 220 case BSTP_PROTO_RSTP: 221 bpdu.cbu_bpdutype = BSTP_MSGTYPE_RSTP; 222 break; 223 } 224 225 bstp_send_bpdu(bs, bp, &bpdu); 226 } 227 228 static void 229 bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp) 230 { 231 struct bstp_tbpdu bpdu; 232 struct ifnet *ifp = bp->bp_ifp; 233 struct ether_header *eh; 234 struct mbuf *m; 235 236 KASSERT(bp == bs->bs_root_port, ("%s: bad root port\n", __func__)); 237 238 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 239 return; 240 241 m = m_gethdr(M_NOWAIT, MT_DATA); 242 if (m == NULL) 243 return; 244 245 m->m_pkthdr.rcvif = ifp; 246 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); 247 m->m_len = m->m_pkthdr.len; 248 249 eh = mtod(m, struct ether_header *); 250 251 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); 252 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 253 eh->ether_type = htons(sizeof(bpdu)); 254 255 bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP; 256 bpdu.tbu_ctl = LLC_UI; 257 bpdu.tbu_protoid = 0; 258 bpdu.tbu_protover = 0; 259 bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN; 260 261 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu)); 262 263 bp->bp_txcount++; 264 ifp->if_transmit(ifp, m); 265 } 266 267 static void 268 bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu, 269 struct bstp_config_unit *cu) 270 { 271 int flags; 272 273 cu->cu_pv.pv_root_id = 274 (((uint64_t)ntohs(cpdu->cbu_rootpri)) << 48) | 275 (((uint64_t)cpdu->cbu_rootaddr[0]) << 40) | 276 (((uint64_t)cpdu->cbu_rootaddr[1]) << 32) | 277 (((uint64_t)cpdu->cbu_rootaddr[2]) << 24) | 278 (((uint64_t)cpdu->cbu_rootaddr[3]) << 16) | 279 (((uint64_t)cpdu->cbu_rootaddr[4]) << 8) | 280 (((uint64_t)cpdu->cbu_rootaddr[5]) << 0); 281 282 cu->cu_pv.pv_dbridge_id = 283 (((uint64_t)ntohs(cpdu->cbu_bridgepri)) << 48) | 284 (((uint64_t)cpdu->cbu_bridgeaddr[0]) << 40) | 285 (((uint64_t)cpdu->cbu_bridgeaddr[1]) << 32) | 286 (((uint64_t)cpdu->cbu_bridgeaddr[2]) << 24) | 287 (((uint64_t)cpdu->cbu_bridgeaddr[3]) << 16) | 288 (((uint64_t)cpdu->cbu_bridgeaddr[4]) << 8) | 289 (((uint64_t)cpdu->cbu_bridgeaddr[5]) << 0); 290 291 cu->cu_pv.pv_cost = ntohl(cpdu->cbu_rootpathcost); 292 cu->cu_message_age = ntohs(cpdu->cbu_messageage); 293 cu->cu_max_age = ntohs(cpdu->cbu_maxage); 294 cu->cu_hello_time = ntohs(cpdu->cbu_hellotime); 295 cu->cu_forward_delay = ntohs(cpdu->cbu_forwarddelay); 296 cu->cu_pv.pv_dport_id = ntohs(cpdu->cbu_portid); 297 cu->cu_pv.pv_port_id = bp->bp_port_id; 298 cu->cu_message_type = cpdu->cbu_bpdutype; 299 300 /* Strip off unused flags in STP mode */ 301 flags = cpdu->cbu_flags; 302 switch (cpdu->cbu_protover) { 303 case BSTP_PROTO_STP: 304 flags &= BSTP_PDU_STPMASK; 305 /* A STP BPDU explicitly conveys a Designated Port */ 306 cu->cu_role = BSTP_ROLE_DESIGNATED; 307 break; 308 309 case BSTP_PROTO_RSTP: 310 flags &= BSTP_PDU_RSTPMASK; 311 break; 312 } 313 314 cu->cu_topology_change_ack = 315 (flags & BSTP_PDU_F_TCA) ? 1 : 0; 316 cu->cu_proposal = 317 (flags & BSTP_PDU_F_P) ? 1 : 0; 318 cu->cu_agree = 319 (flags & BSTP_PDU_F_A) ? 1 : 0; 320 cu->cu_learning = 321 (flags & BSTP_PDU_F_L) ? 1 : 0; 322 cu->cu_forwarding = 323 (flags & BSTP_PDU_F_F) ? 1 : 0; 324 cu->cu_topology_change = 325 (flags & BSTP_PDU_F_TC) ? 1 : 0; 326 327 switch ((flags & BSTP_PDU_PRMASK) >> BSTP_PDU_PRSHIFT) { 328 case BSTP_PDU_F_ROOT: 329 cu->cu_role = BSTP_ROLE_ROOT; 330 break; 331 case BSTP_PDU_F_ALT: 332 cu->cu_role = BSTP_ROLE_ALTERNATE; 333 break; 334 case BSTP_PDU_F_DESG: 335 cu->cu_role = BSTP_ROLE_DESIGNATED; 336 break; 337 } 338 } 339 340 static void 341 bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp, 342 struct bstp_cbpdu *bpdu) 343 { 344 struct ifnet *ifp; 345 struct mbuf *m; 346 struct ether_header *eh; 347 348 BSTP_LOCK_ASSERT(bs); 349 350 ifp = bp->bp_ifp; 351 352 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 353 return; 354 355 m = m_gethdr(M_NOWAIT, MT_DATA); 356 if (m == NULL) 357 return; 358 359 eh = mtod(m, struct ether_header *); 360 361 bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP; 362 bpdu->cbu_ctl = LLC_UI; 363 bpdu->cbu_protoid = htons(BSTP_PROTO_ID); 364 365 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); 366 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 367 368 switch (bpdu->cbu_bpdutype) { 369 case BSTP_MSGTYPE_CFG: 370 bpdu->cbu_protover = BSTP_PROTO_STP; 371 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_STP_LEN; 372 eh->ether_type = htons(BSTP_BPDU_STP_LEN); 373 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, 374 BSTP_BPDU_STP_LEN); 375 break; 376 377 case BSTP_MSGTYPE_RSTP: 378 bpdu->cbu_protover = BSTP_PROTO_RSTP; 379 bpdu->cbu_versionlen = htons(0); 380 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_RSTP_LEN; 381 eh->ether_type = htons(BSTP_BPDU_RSTP_LEN); 382 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, 383 BSTP_BPDU_RSTP_LEN); 384 break; 385 386 default: 387 panic("not implemented"); 388 } 389 m->m_pkthdr.rcvif = ifp; 390 m->m_len = m->m_pkthdr.len; 391 392 bp->bp_txcount++; 393 ifp->if_transmit(ifp, m); 394 } 395 396 static int 397 bstp_pdu_flags(struct bstp_port *bp) 398 { 399 int flags = 0; 400 401 if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING) 402 flags |= BSTP_PDU_F_P; 403 404 if (bp->bp_agree) 405 flags |= BSTP_PDU_F_A; 406 407 if (bp->bp_tc_timer.active) 408 flags |= BSTP_PDU_F_TC; 409 410 if (bp->bp_tc_ack) 411 flags |= BSTP_PDU_F_TCA; 412 413 switch (bp->bp_state) { 414 case BSTP_IFSTATE_LEARNING: 415 flags |= BSTP_PDU_F_L; 416 break; 417 418 case BSTP_IFSTATE_FORWARDING: 419 flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F); 420 break; 421 } 422 423 switch (bp->bp_role) { 424 case BSTP_ROLE_ROOT: 425 flags |= 426 (BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT); 427 break; 428 429 case BSTP_ROLE_ALTERNATE: 430 case BSTP_ROLE_BACKUP: /* fall through */ 431 flags |= 432 (BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT); 433 break; 434 435 case BSTP_ROLE_DESIGNATED: 436 flags |= 437 (BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT); 438 break; 439 } 440 441 /* Strip off unused flags in either mode */ 442 switch (bp->bp_protover) { 443 case BSTP_PROTO_STP: 444 flags &= BSTP_PDU_STPMASK; 445 break; 446 case BSTP_PROTO_RSTP: 447 flags &= BSTP_PDU_RSTPMASK; 448 break; 449 } 450 return (flags); 451 } 452 453 void 454 bstp_input(struct bstp_port *bp, struct ifnet *ifp, struct mbuf *m) 455 { 456 struct bstp_state *bs = bp->bp_bs; 457 struct ether_header *eh; 458 struct bstp_tbpdu tpdu; 459 uint16_t len; 460 461 if (bp->bp_active == 0) { 462 m_freem(m); 463 return; 464 } 465 466 BSTP_LOCK(bs); 467 468 eh = mtod(m, struct ether_header *); 469 470 len = ntohs(eh->ether_type); 471 if (len < sizeof(tpdu)) 472 goto out; 473 474 m_adj(m, ETHER_HDR_LEN); 475 476 if (m->m_pkthdr.len > len) 477 m_adj(m, len - m->m_pkthdr.len); 478 if (m->m_len < sizeof(tpdu) && 479 (m = m_pullup(m, sizeof(tpdu))) == NULL) 480 goto out; 481 482 memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu)); 483 484 /* basic packet checks */ 485 if (tpdu.tbu_dsap != LLC_8021D_LSAP || 486 tpdu.tbu_ssap != LLC_8021D_LSAP || 487 tpdu.tbu_ctl != LLC_UI) 488 goto out; 489 if (tpdu.tbu_protoid != BSTP_PROTO_ID) 490 goto out; 491 492 /* 493 * We can treat later versions of the PDU as the same as the maximum 494 * version we implement. All additional parameters/flags are ignored. 495 */ 496 if (tpdu.tbu_protover > BSTP_PROTO_MAX) 497 tpdu.tbu_protover = BSTP_PROTO_MAX; 498 499 if (tpdu.tbu_protover != bp->bp_protover) { 500 /* 501 * Wait for the migration delay timer to expire before changing 502 * protocol version to avoid flip-flops. 503 */ 504 if (bp->bp_flags & BSTP_PORT_CANMIGRATE) 505 bstp_set_port_proto(bp, tpdu.tbu_protover); 506 else 507 goto out; 508 } 509 510 /* Clear operedge upon receiving a PDU on the port */ 511 bp->bp_operedge = 0; 512 bstp_timer_start(&bp->bp_edge_delay_timer, 513 BSTP_DEFAULT_MIGRATE_DELAY); 514 515 switch (tpdu.tbu_protover) { 516 case BSTP_PROTO_STP: 517 bstp_received_stp(bs, bp, &m, &tpdu); 518 break; 519 520 case BSTP_PROTO_RSTP: 521 bstp_received_rstp(bs, bp, &m, &tpdu); 522 break; 523 } 524 out: 525 BSTP_UNLOCK(bs); 526 if (m) 527 m_freem(m); 528 } 529 530 static void 531 bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp, 532 struct mbuf **mp, struct bstp_tbpdu *tpdu) 533 { 534 struct bstp_cbpdu cpdu; 535 struct bstp_config_unit *cu = &bp->bp_msg_cu; 536 struct bstp_tcn_unit tu; 537 538 switch (tpdu->tbu_bpdutype) { 539 case BSTP_MSGTYPE_TCN: 540 tu.tu_message_type = tpdu->tbu_bpdutype; 541 bstp_received_tcn(bs, bp, &tu); 542 break; 543 case BSTP_MSGTYPE_CFG: 544 if ((*mp)->m_len < BSTP_BPDU_STP_LEN && 545 (*mp = m_pullup(*mp, BSTP_BPDU_STP_LEN)) == NULL) 546 return; 547 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_STP_LEN); 548 549 bstp_decode_bpdu(bp, &cpdu, cu); 550 bstp_received_bpdu(bs, bp, cu); 551 break; 552 } 553 } 554 555 static void 556 bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp, 557 struct mbuf **mp, struct bstp_tbpdu *tpdu) 558 { 559 struct bstp_cbpdu cpdu; 560 struct bstp_config_unit *cu = &bp->bp_msg_cu; 561 562 if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP) 563 return; 564 565 if ((*mp)->m_len < BSTP_BPDU_RSTP_LEN && 566 (*mp = m_pullup(*mp, BSTP_BPDU_RSTP_LEN)) == NULL) 567 return; 568 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_RSTP_LEN); 569 570 bstp_decode_bpdu(bp, &cpdu, cu); 571 bstp_received_bpdu(bs, bp, cu); 572 } 573 574 static void 575 bstp_received_tcn(struct bstp_state *bs, struct bstp_port *bp, 576 struct bstp_tcn_unit *tcn) 577 { 578 bp->bp_rcvdtcn = 1; 579 bstp_update_tc(bp); 580 } 581 582 static void 583 bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp, 584 struct bstp_config_unit *cu) 585 { 586 int type; 587 588 BSTP_LOCK_ASSERT(bs); 589 590 /* We need to have transitioned to INFO_MINE before proceeding */ 591 switch (bp->bp_infois) { 592 case BSTP_INFO_DISABLED: 593 case BSTP_INFO_AGED: 594 return; 595 } 596 597 type = bstp_pdu_rcvtype(bp, cu); 598 599 switch (type) { 600 case BSTP_PDU_SUPERIOR: 601 bs->bs_allsynced = 0; 602 bp->bp_agreed = 0; 603 bp->bp_proposing = 0; 604 605 if (cu->cu_proposal && cu->cu_forwarding == 0) 606 bp->bp_proposed = 1; 607 if (cu->cu_topology_change) 608 bp->bp_rcvdtc = 1; 609 if (cu->cu_topology_change_ack) 610 bp->bp_rcvdtca = 1; 611 612 if (bp->bp_agree && 613 !bstp_pdu_bettersame(bp, BSTP_INFO_RECEIVED)) 614 bp->bp_agree = 0; 615 616 /* copy the received priority and timers to the port */ 617 bp->bp_port_pv = cu->cu_pv; 618 bp->bp_port_msg_age = cu->cu_message_age; 619 bp->bp_port_max_age = cu->cu_max_age; 620 bp->bp_port_fdelay = cu->cu_forward_delay; 621 bp->bp_port_htime = 622 (cu->cu_hello_time > BSTP_MIN_HELLO_TIME ? 623 cu->cu_hello_time : BSTP_MIN_HELLO_TIME); 624 625 /* set expiry for the new info */ 626 bstp_set_timer_msgage(bp); 627 628 bp->bp_infois = BSTP_INFO_RECEIVED; 629 bstp_assign_roles(bs); 630 break; 631 632 case BSTP_PDU_REPEATED: 633 if (cu->cu_proposal && cu->cu_forwarding == 0) 634 bp->bp_proposed = 1; 635 if (cu->cu_topology_change) 636 bp->bp_rcvdtc = 1; 637 if (cu->cu_topology_change_ack) 638 bp->bp_rcvdtca = 1; 639 640 /* rearm the age timer */ 641 bstp_set_timer_msgage(bp); 642 break; 643 644 case BSTP_PDU_INFERIOR: 645 if (cu->cu_learning) { 646 bp->bp_agreed = 1; 647 bp->bp_proposing = 0; 648 } 649 break; 650 651 case BSTP_PDU_INFERIORALT: 652 /* 653 * only point to point links are allowed fast 654 * transitions to forwarding. 655 */ 656 if (cu->cu_agree && bp->bp_ptp_link) { 657 bp->bp_agreed = 1; 658 bp->bp_proposing = 0; 659 } else 660 bp->bp_agreed = 0; 661 662 if (cu->cu_topology_change) 663 bp->bp_rcvdtc = 1; 664 if (cu->cu_topology_change_ack) 665 bp->bp_rcvdtca = 1; 666 break; 667 668 case BSTP_PDU_OTHER: 669 return; /* do nothing */ 670 } 671 /* update the state machines with the new data */ 672 bstp_update_state(bs, bp); 673 } 674 675 static int 676 bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu) 677 { 678 int type; 679 680 /* default return type */ 681 type = BSTP_PDU_OTHER; 682 683 switch (cu->cu_role) { 684 case BSTP_ROLE_DESIGNATED: 685 if (bstp_info_superior(&bp->bp_port_pv, &cu->cu_pv)) 686 /* bpdu priority is superior */ 687 type = BSTP_PDU_SUPERIOR; 688 else if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) == 689 INFO_SAME) { 690 if (bp->bp_port_msg_age != cu->cu_message_age || 691 bp->bp_port_max_age != cu->cu_max_age || 692 bp->bp_port_fdelay != cu->cu_forward_delay || 693 bp->bp_port_htime != cu->cu_hello_time) 694 /* bpdu priority is equal and timers differ */ 695 type = BSTP_PDU_SUPERIOR; 696 else 697 /* bpdu is equal */ 698 type = BSTP_PDU_REPEATED; 699 } else 700 /* bpdu priority is worse */ 701 type = BSTP_PDU_INFERIOR; 702 703 break; 704 705 case BSTP_ROLE_ROOT: 706 case BSTP_ROLE_ALTERNATE: 707 case BSTP_ROLE_BACKUP: 708 if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) <= INFO_SAME) 709 /* 710 * not a designated port and priority is the same or 711 * worse 712 */ 713 type = BSTP_PDU_INFERIORALT; 714 break; 715 } 716 717 return (type); 718 } 719 720 static int 721 bstp_pdu_bettersame(struct bstp_port *bp, int newinfo) 722 { 723 if (newinfo == BSTP_INFO_RECEIVED && 724 bp->bp_infois == BSTP_INFO_RECEIVED && 725 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME) 726 return (1); 727 728 if (newinfo == BSTP_INFO_MINE && 729 bp->bp_infois == BSTP_INFO_MINE && 730 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) >= INFO_SAME) 731 return (1); 732 733 return (0); 734 } 735 736 static int 737 bstp_info_cmp(struct bstp_pri_vector *pv, 738 struct bstp_pri_vector *cpv) 739 { 740 if (cpv->pv_root_id < pv->pv_root_id) 741 return (INFO_BETTER); 742 if (cpv->pv_root_id > pv->pv_root_id) 743 return (INFO_WORSE); 744 745 if (cpv->pv_cost < pv->pv_cost) 746 return (INFO_BETTER); 747 if (cpv->pv_cost > pv->pv_cost) 748 return (INFO_WORSE); 749 750 if (cpv->pv_dbridge_id < pv->pv_dbridge_id) 751 return (INFO_BETTER); 752 if (cpv->pv_dbridge_id > pv->pv_dbridge_id) 753 return (INFO_WORSE); 754 755 if (cpv->pv_dport_id < pv->pv_dport_id) 756 return (INFO_BETTER); 757 if (cpv->pv_dport_id > pv->pv_dport_id) 758 return (INFO_WORSE); 759 760 return (INFO_SAME); 761 } 762 763 /* 764 * This message priority vector is superior to the port priority vector and 765 * will replace it if, and only if, the message priority vector is better than 766 * the port priority vector, or the message has been transmitted from the same 767 * designated bridge and designated port as the port priority vector. 768 */ 769 static int 770 bstp_info_superior(struct bstp_pri_vector *pv, 771 struct bstp_pri_vector *cpv) 772 { 773 if (bstp_info_cmp(pv, cpv) == INFO_BETTER || 774 (bstp_same_bridgeid(pv->pv_dbridge_id, cpv->pv_dbridge_id) && 775 (cpv->pv_dport_id & 0xfff) == (pv->pv_dport_id & 0xfff))) 776 return (1); 777 return (0); 778 } 779 780 static void 781 bstp_assign_roles(struct bstp_state *bs) 782 { 783 struct bstp_port *bp, *rbp = NULL; 784 struct bstp_pri_vector pv; 785 786 /* default to our priority vector */ 787 bs->bs_root_pv = bs->bs_bridge_pv; 788 bs->bs_root_msg_age = 0; 789 bs->bs_root_max_age = bs->bs_bridge_max_age; 790 bs->bs_root_fdelay = bs->bs_bridge_fdelay; 791 bs->bs_root_htime = bs->bs_bridge_htime; 792 bs->bs_root_port = NULL; 793 794 /* check if any received info supersedes us */ 795 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 796 if (bp->bp_infois != BSTP_INFO_RECEIVED) 797 continue; 798 799 pv = bp->bp_port_pv; 800 pv.pv_cost += bp->bp_path_cost; 801 802 /* 803 * The root priority vector is the best of the set comprising 804 * the bridge priority vector plus all root path priority 805 * vectors whose bridge address is not equal to us. 806 */ 807 if (bstp_same_bridgeid(pv.pv_dbridge_id, 808 bs->bs_bridge_pv.pv_dbridge_id) == 0 && 809 bstp_info_cmp(&bs->bs_root_pv, &pv) == INFO_BETTER) { 810 /* the port vector replaces the root */ 811 bs->bs_root_pv = pv; 812 bs->bs_root_msg_age = bp->bp_port_msg_age + 813 BSTP_MESSAGE_AGE_INCR; 814 bs->bs_root_max_age = bp->bp_port_max_age; 815 bs->bs_root_fdelay = bp->bp_port_fdelay; 816 bs->bs_root_htime = bp->bp_port_htime; 817 rbp = bp; 818 } 819 } 820 821 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 822 /* calculate the port designated vector */ 823 bp->bp_desg_pv.pv_root_id = bs->bs_root_pv.pv_root_id; 824 bp->bp_desg_pv.pv_cost = bs->bs_root_pv.pv_cost; 825 bp->bp_desg_pv.pv_dbridge_id = bs->bs_bridge_pv.pv_dbridge_id; 826 bp->bp_desg_pv.pv_dport_id = bp->bp_port_id; 827 bp->bp_desg_pv.pv_port_id = bp->bp_port_id; 828 829 /* calculate designated times */ 830 bp->bp_desg_msg_age = bs->bs_root_msg_age; 831 bp->bp_desg_max_age = bs->bs_root_max_age; 832 bp->bp_desg_fdelay = bs->bs_root_fdelay; 833 bp->bp_desg_htime = bs->bs_bridge_htime; 834 835 switch (bp->bp_infois) { 836 case BSTP_INFO_DISABLED: 837 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 838 break; 839 840 case BSTP_INFO_AGED: 841 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 842 bstp_update_info(bp); 843 break; 844 845 case BSTP_INFO_MINE: 846 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 847 /* update the port info if stale */ 848 if (bstp_info_cmp(&bp->bp_port_pv, 849 &bp->bp_desg_pv) != INFO_SAME || 850 (rbp != NULL && 851 (bp->bp_port_msg_age != rbp->bp_port_msg_age || 852 bp->bp_port_max_age != rbp->bp_port_max_age || 853 bp->bp_port_fdelay != rbp->bp_port_fdelay || 854 bp->bp_port_htime != rbp->bp_port_htime))) 855 bstp_update_info(bp); 856 break; 857 858 case BSTP_INFO_RECEIVED: 859 if (bp == rbp) { 860 /* 861 * root priority is derived from this 862 * port, make it the root port. 863 */ 864 bstp_set_port_role(bp, BSTP_ROLE_ROOT); 865 bs->bs_root_port = bp; 866 } else if (bstp_info_cmp(&bp->bp_port_pv, 867 &bp->bp_desg_pv) == INFO_BETTER) { 868 /* 869 * the port priority is lower than the root 870 * port. 871 */ 872 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 873 bstp_update_info(bp); 874 } else { 875 if (bstp_same_bridgeid( 876 bp->bp_port_pv.pv_dbridge_id, 877 bs->bs_bridge_pv.pv_dbridge_id)) { 878 /* 879 * the designated bridge refers to 880 * another port on this bridge. 881 */ 882 bstp_set_port_role(bp, 883 BSTP_ROLE_BACKUP); 884 } else { 885 /* 886 * the port is an inferior path to the 887 * root bridge. 888 */ 889 bstp_set_port_role(bp, 890 BSTP_ROLE_ALTERNATE); 891 } 892 } 893 break; 894 } 895 } 896 } 897 898 static void 899 bstp_update_state(struct bstp_state *bs, struct bstp_port *bp) 900 { 901 struct bstp_port *bp2; 902 int synced; 903 904 BSTP_LOCK_ASSERT(bs); 905 906 /* check if all the ports have syncronised again */ 907 if (!bs->bs_allsynced) { 908 synced = 1; 909 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 910 if (!(bp2->bp_synced || 911 bp2->bp_role == BSTP_ROLE_ROOT)) { 912 synced = 0; 913 break; 914 } 915 } 916 bs->bs_allsynced = synced; 917 } 918 919 bstp_update_roles(bs, bp); 920 bstp_update_tc(bp); 921 } 922 923 static void 924 bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp) 925 { 926 switch (bp->bp_role) { 927 case BSTP_ROLE_DISABLED: 928 /* Clear any flags if set */ 929 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 930 bp->bp_sync = 0; 931 bp->bp_synced = 1; 932 bp->bp_reroot = 0; 933 } 934 break; 935 936 case BSTP_ROLE_ALTERNATE: 937 case BSTP_ROLE_BACKUP: 938 if ((bs->bs_allsynced && !bp->bp_agree) || 939 (bp->bp_proposed && bp->bp_agree)) { 940 bp->bp_proposed = 0; 941 bp->bp_agree = 1; 942 bp->bp_flags |= BSTP_PORT_NEWINFO; 943 DPRINTF("%s -> ALTERNATE_AGREED\n", 944 bp->bp_ifp->if_xname); 945 } 946 947 if (bp->bp_proposed && !bp->bp_agree) { 948 bstp_set_all_sync(bs); 949 bp->bp_proposed = 0; 950 DPRINTF("%s -> ALTERNATE_PROPOSED\n", 951 bp->bp_ifp->if_xname); 952 } 953 954 /* Clear any flags if set */ 955 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 956 bp->bp_sync = 0; 957 bp->bp_synced = 1; 958 bp->bp_reroot = 0; 959 DPRINTF("%s -> ALTERNATE_PORT\n", bp->bp_ifp->if_xname); 960 } 961 break; 962 963 case BSTP_ROLE_ROOT: 964 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) { 965 bstp_set_all_reroot(bs); 966 DPRINTF("%s -> ROOT_REROOT\n", bp->bp_ifp->if_xname); 967 } 968 969 if ((bs->bs_allsynced && !bp->bp_agree) || 970 (bp->bp_proposed && bp->bp_agree)) { 971 bp->bp_proposed = 0; 972 bp->bp_sync = 0; 973 bp->bp_agree = 1; 974 bp->bp_flags |= BSTP_PORT_NEWINFO; 975 DPRINTF("%s -> ROOT_AGREED\n", bp->bp_ifp->if_xname); 976 } 977 978 if (bp->bp_proposed && !bp->bp_agree) { 979 bstp_set_all_sync(bs); 980 bp->bp_proposed = 0; 981 DPRINTF("%s -> ROOT_PROPOSED\n", bp->bp_ifp->if_xname); 982 } 983 984 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 985 (bp->bp_forward_delay_timer.active == 0 || 986 (bstp_rerooted(bs, bp) && 987 bp->bp_recent_backup_timer.active == 0 && 988 bp->bp_protover == BSTP_PROTO_RSTP))) { 989 switch (bp->bp_state) { 990 case BSTP_IFSTATE_DISCARDING: 991 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 992 break; 993 case BSTP_IFSTATE_LEARNING: 994 bstp_set_port_state(bp, 995 BSTP_IFSTATE_FORWARDING); 996 break; 997 } 998 } 999 1000 if (bp->bp_state == BSTP_IFSTATE_FORWARDING && bp->bp_reroot) { 1001 bp->bp_reroot = 0; 1002 DPRINTF("%s -> ROOT_REROOTED\n", bp->bp_ifp->if_xname); 1003 } 1004 break; 1005 1006 case BSTP_ROLE_DESIGNATED: 1007 if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) { 1008 bp->bp_reroot = 0; 1009 DPRINTF("%s -> DESIGNATED_RETIRED\n", 1010 bp->bp_ifp->if_xname); 1011 } 1012 1013 if ((bp->bp_state == BSTP_IFSTATE_DISCARDING && 1014 !bp->bp_synced) || (bp->bp_agreed && !bp->bp_synced) || 1015 (bp->bp_operedge && !bp->bp_synced) || 1016 (bp->bp_sync && bp->bp_synced)) { 1017 bstp_timer_stop(&bp->bp_recent_root_timer); 1018 bp->bp_synced = 1; 1019 bp->bp_sync = 0; 1020 DPRINTF("%s -> DESIGNATED_SYNCED\n", 1021 bp->bp_ifp->if_xname); 1022 } 1023 1024 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1025 !bp->bp_agreed && !bp->bp_proposing && 1026 !bp->bp_operedge) { 1027 bp->bp_proposing = 1; 1028 bp->bp_flags |= BSTP_PORT_NEWINFO; 1029 bstp_timer_start(&bp->bp_edge_delay_timer, 1030 (bp->bp_ptp_link ? BSTP_DEFAULT_MIGRATE_DELAY : 1031 bp->bp_desg_max_age)); 1032 DPRINTF("%s -> DESIGNATED_PROPOSE\n", 1033 bp->bp_ifp->if_xname); 1034 } 1035 1036 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1037 (bp->bp_forward_delay_timer.active == 0 || bp->bp_agreed || 1038 bp->bp_operedge) && 1039 (bp->bp_recent_root_timer.active == 0 || !bp->bp_reroot) && 1040 !bp->bp_sync) { 1041 if (bp->bp_agreed) 1042 DPRINTF("%s -> AGREED\n", bp->bp_ifp->if_xname); 1043 /* 1044 * If agreed|operedge then go straight to forwarding, 1045 * otherwise follow discard -> learn -> forward. 1046 */ 1047 if (bp->bp_agreed || bp->bp_operedge || 1048 bp->bp_state == BSTP_IFSTATE_LEARNING) { 1049 bstp_set_port_state(bp, 1050 BSTP_IFSTATE_FORWARDING); 1051 bp->bp_agreed = bp->bp_protover; 1052 } else if (bp->bp_state == BSTP_IFSTATE_DISCARDING) 1053 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 1054 } 1055 1056 if (((bp->bp_sync && !bp->bp_synced) || 1057 (bp->bp_reroot && bp->bp_recent_root_timer.active) || 1058 (bp->bp_flags & BSTP_PORT_DISPUTED)) && !bp->bp_operedge && 1059 bp->bp_state != BSTP_IFSTATE_DISCARDING) { 1060 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1061 bp->bp_flags &= ~BSTP_PORT_DISPUTED; 1062 bstp_timer_start(&bp->bp_forward_delay_timer, 1063 bp->bp_protover == BSTP_PROTO_RSTP ? 1064 bp->bp_desg_htime : bp->bp_desg_fdelay); 1065 DPRINTF("%s -> DESIGNATED_DISCARD\n", 1066 bp->bp_ifp->if_xname); 1067 } 1068 break; 1069 } 1070 1071 if (bp->bp_flags & BSTP_PORT_NEWINFO) 1072 bstp_transmit(bs, bp); 1073 } 1074 1075 static void 1076 bstp_update_tc(struct bstp_port *bp) 1077 { 1078 switch (bp->bp_tcstate) { 1079 case BSTP_TCSTATE_ACTIVE: 1080 if ((bp->bp_role != BSTP_ROLE_DESIGNATED && 1081 bp->bp_role != BSTP_ROLE_ROOT) || bp->bp_operedge) 1082 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1083 1084 if (bp->bp_rcvdtcn) 1085 bstp_set_port_tc(bp, BSTP_TCSTATE_TCN); 1086 if (bp->bp_rcvdtc) 1087 bstp_set_port_tc(bp, BSTP_TCSTATE_TC); 1088 1089 if (bp->bp_tc_prop && !bp->bp_operedge) 1090 bstp_set_port_tc(bp, BSTP_TCSTATE_PROPAG); 1091 1092 if (bp->bp_rcvdtca) 1093 bstp_set_port_tc(bp, BSTP_TCSTATE_ACK); 1094 break; 1095 1096 case BSTP_TCSTATE_INACTIVE: 1097 if ((bp->bp_state == BSTP_IFSTATE_LEARNING || 1098 bp->bp_state == BSTP_IFSTATE_FORWARDING) && 1099 bp->bp_fdbflush == 0) 1100 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1101 break; 1102 1103 case BSTP_TCSTATE_LEARNING: 1104 if (bp->bp_rcvdtc || bp->bp_rcvdtcn || bp->bp_rcvdtca || 1105 bp->bp_tc_prop) 1106 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1107 else if (bp->bp_role != BSTP_ROLE_DESIGNATED && 1108 bp->bp_role != BSTP_ROLE_ROOT && 1109 bp->bp_state == BSTP_IFSTATE_DISCARDING) 1110 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1111 1112 if ((bp->bp_role == BSTP_ROLE_DESIGNATED || 1113 bp->bp_role == BSTP_ROLE_ROOT) && 1114 bp->bp_state == BSTP_IFSTATE_FORWARDING && 1115 !bp->bp_operedge) 1116 bstp_set_port_tc(bp, BSTP_TCSTATE_DETECTED); 1117 break; 1118 1119 /* these are transient states and go straight back to ACTIVE */ 1120 case BSTP_TCSTATE_DETECTED: 1121 case BSTP_TCSTATE_TCN: 1122 case BSTP_TCSTATE_TC: 1123 case BSTP_TCSTATE_PROPAG: 1124 case BSTP_TCSTATE_ACK: 1125 DPRINTF("Invalid TC state for %s\n", 1126 bp->bp_ifp->if_xname); 1127 break; 1128 } 1129 1130 } 1131 1132 static void 1133 bstp_update_info(struct bstp_port *bp) 1134 { 1135 struct bstp_state *bs = bp->bp_bs; 1136 1137 bp->bp_proposing = 0; 1138 bp->bp_proposed = 0; 1139 1140 if (bp->bp_agreed && !bstp_pdu_bettersame(bp, BSTP_INFO_MINE)) 1141 bp->bp_agreed = 0; 1142 1143 if (bp->bp_synced && !bp->bp_agreed) { 1144 bp->bp_synced = 0; 1145 bs->bs_allsynced = 0; 1146 } 1147 1148 /* copy the designated pv to the port */ 1149 bp->bp_port_pv = bp->bp_desg_pv; 1150 bp->bp_port_msg_age = bp->bp_desg_msg_age; 1151 bp->bp_port_max_age = bp->bp_desg_max_age; 1152 bp->bp_port_fdelay = bp->bp_desg_fdelay; 1153 bp->bp_port_htime = bp->bp_desg_htime; 1154 bp->bp_infois = BSTP_INFO_MINE; 1155 1156 /* Set transmit flag but do not immediately send */ 1157 bp->bp_flags |= BSTP_PORT_NEWINFO; 1158 } 1159 1160 /* set tcprop on every port other than the caller */ 1161 static void 1162 bstp_set_other_tcprop(struct bstp_port *bp) 1163 { 1164 struct bstp_state *bs = bp->bp_bs; 1165 struct bstp_port *bp2; 1166 1167 BSTP_LOCK_ASSERT(bs); 1168 1169 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1170 if (bp2 == bp) 1171 continue; 1172 bp2->bp_tc_prop = 1; 1173 } 1174 } 1175 1176 static void 1177 bstp_set_all_reroot(struct bstp_state *bs) 1178 { 1179 struct bstp_port *bp; 1180 1181 BSTP_LOCK_ASSERT(bs); 1182 1183 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1184 bp->bp_reroot = 1; 1185 } 1186 1187 static void 1188 bstp_set_all_sync(struct bstp_state *bs) 1189 { 1190 struct bstp_port *bp; 1191 1192 BSTP_LOCK_ASSERT(bs); 1193 1194 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1195 bp->bp_sync = 1; 1196 bp->bp_synced = 0; /* Not explicit in spec */ 1197 } 1198 1199 bs->bs_allsynced = 0; 1200 } 1201 1202 static void 1203 bstp_set_port_state(struct bstp_port *bp, int state) 1204 { 1205 if (bp->bp_state == state) 1206 return; 1207 1208 bp->bp_state = state; 1209 1210 switch (bp->bp_state) { 1211 case BSTP_IFSTATE_DISCARDING: 1212 DPRINTF("state changed to DISCARDING on %s\n", 1213 bp->bp_ifp->if_xname); 1214 break; 1215 1216 case BSTP_IFSTATE_LEARNING: 1217 DPRINTF("state changed to LEARNING on %s\n", 1218 bp->bp_ifp->if_xname); 1219 1220 bstp_timer_start(&bp->bp_forward_delay_timer, 1221 bp->bp_protover == BSTP_PROTO_RSTP ? 1222 bp->bp_desg_htime : bp->bp_desg_fdelay); 1223 break; 1224 1225 case BSTP_IFSTATE_FORWARDING: 1226 DPRINTF("state changed to FORWARDING on %s\n", 1227 bp->bp_ifp->if_xname); 1228 1229 bstp_timer_stop(&bp->bp_forward_delay_timer); 1230 /* Record that we enabled forwarding */ 1231 bp->bp_forward_transitions++; 1232 break; 1233 } 1234 1235 /* notify the parent bridge */ 1236 taskqueue_enqueue(taskqueue_swi, &bp->bp_statetask); 1237 } 1238 1239 static void 1240 bstp_set_port_role(struct bstp_port *bp, int role) 1241 { 1242 struct bstp_state *bs = bp->bp_bs; 1243 1244 if (bp->bp_role == role) 1245 return; 1246 1247 /* perform pre-change tasks */ 1248 switch (bp->bp_role) { 1249 case BSTP_ROLE_DISABLED: 1250 bstp_timer_start(&bp->bp_forward_delay_timer, 1251 bp->bp_desg_max_age); 1252 break; 1253 1254 case BSTP_ROLE_BACKUP: 1255 bstp_timer_start(&bp->bp_recent_backup_timer, 1256 bp->bp_desg_htime * 2); 1257 /* fall through */ 1258 case BSTP_ROLE_ALTERNATE: 1259 bstp_timer_start(&bp->bp_forward_delay_timer, 1260 bp->bp_desg_fdelay); 1261 bp->bp_sync = 0; 1262 bp->bp_synced = 1; 1263 bp->bp_reroot = 0; 1264 break; 1265 1266 case BSTP_ROLE_ROOT: 1267 bstp_timer_start(&bp->bp_recent_root_timer, 1268 BSTP_DEFAULT_FORWARD_DELAY); 1269 break; 1270 } 1271 1272 bp->bp_role = role; 1273 /* clear values not carried between roles */ 1274 bp->bp_proposing = 0; 1275 bs->bs_allsynced = 0; 1276 1277 /* initialise the new role */ 1278 switch (bp->bp_role) { 1279 case BSTP_ROLE_DISABLED: 1280 case BSTP_ROLE_ALTERNATE: 1281 case BSTP_ROLE_BACKUP: 1282 DPRINTF("%s role -> ALT/BACK/DISABLED\n", 1283 bp->bp_ifp->if_xname); 1284 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1285 bstp_timer_stop(&bp->bp_recent_root_timer); 1286 bstp_timer_latch(&bp->bp_forward_delay_timer); 1287 bp->bp_sync = 0; 1288 bp->bp_synced = 1; 1289 bp->bp_reroot = 0; 1290 break; 1291 1292 case BSTP_ROLE_ROOT: 1293 DPRINTF("%s role -> ROOT\n", 1294 bp->bp_ifp->if_xname); 1295 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1296 bstp_timer_latch(&bp->bp_recent_root_timer); 1297 bp->bp_proposing = 0; 1298 break; 1299 1300 case BSTP_ROLE_DESIGNATED: 1301 DPRINTF("%s role -> DESIGNATED\n", 1302 bp->bp_ifp->if_xname); 1303 bstp_timer_start(&bp->bp_hello_timer, 1304 bp->bp_desg_htime); 1305 bp->bp_agree = 0; 1306 break; 1307 } 1308 1309 /* let the TC state know that the role changed */ 1310 bstp_update_tc(bp); 1311 } 1312 1313 static void 1314 bstp_set_port_proto(struct bstp_port *bp, int proto) 1315 { 1316 struct bstp_state *bs = bp->bp_bs; 1317 1318 /* supported protocol versions */ 1319 switch (proto) { 1320 case BSTP_PROTO_STP: 1321 /* we can downgrade protocols only */ 1322 bstp_timer_stop(&bp->bp_migrate_delay_timer); 1323 /* clear unsupported features */ 1324 bp->bp_operedge = 0; 1325 /* STP compat mode only uses 16 bits of the 32 */ 1326 if (bp->bp_path_cost > 65535) 1327 bp->bp_path_cost = 65535; 1328 break; 1329 1330 case BSTP_PROTO_RSTP: 1331 bstp_timer_start(&bp->bp_migrate_delay_timer, 1332 bs->bs_migration_delay); 1333 break; 1334 1335 default: 1336 DPRINTF("Unsupported STP version %d\n", proto); 1337 return; 1338 } 1339 1340 bp->bp_protover = proto; 1341 bp->bp_flags &= ~BSTP_PORT_CANMIGRATE; 1342 } 1343 1344 static void 1345 bstp_set_port_tc(struct bstp_port *bp, int state) 1346 { 1347 struct bstp_state *bs = bp->bp_bs; 1348 1349 bp->bp_tcstate = state; 1350 1351 /* initialise the new state */ 1352 switch (bp->bp_tcstate) { 1353 case BSTP_TCSTATE_ACTIVE: 1354 DPRINTF("%s -> TC_ACTIVE\n", bp->bp_ifp->if_xname); 1355 /* nothing to do */ 1356 break; 1357 1358 case BSTP_TCSTATE_INACTIVE: 1359 bstp_timer_stop(&bp->bp_tc_timer); 1360 /* flush routes on the parent bridge */ 1361 bp->bp_fdbflush = 1; 1362 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask); 1363 bp->bp_tc_ack = 0; 1364 DPRINTF("%s -> TC_INACTIVE\n", bp->bp_ifp->if_xname); 1365 break; 1366 1367 case BSTP_TCSTATE_LEARNING: 1368 bp->bp_rcvdtc = 0; 1369 bp->bp_rcvdtcn = 0; 1370 bp->bp_rcvdtca = 0; 1371 bp->bp_tc_prop = 0; 1372 DPRINTF("%s -> TC_LEARNING\n", bp->bp_ifp->if_xname); 1373 break; 1374 1375 case BSTP_TCSTATE_DETECTED: 1376 bstp_set_timer_tc(bp); 1377 bstp_set_other_tcprop(bp); 1378 /* send out notification */ 1379 bp->bp_flags |= BSTP_PORT_NEWINFO; 1380 bstp_transmit(bs, bp); 1381 getmicrotime(&bs->bs_last_tc_time); 1382 DPRINTF("%s -> TC_DETECTED\n", bp->bp_ifp->if_xname); 1383 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1384 break; 1385 1386 case BSTP_TCSTATE_TCN: 1387 bstp_set_timer_tc(bp); 1388 DPRINTF("%s -> TC_TCN\n", bp->bp_ifp->if_xname); 1389 /* fall through */ 1390 case BSTP_TCSTATE_TC: 1391 bp->bp_rcvdtc = 0; 1392 bp->bp_rcvdtcn = 0; 1393 if (bp->bp_role == BSTP_ROLE_DESIGNATED) 1394 bp->bp_tc_ack = 1; 1395 1396 bstp_set_other_tcprop(bp); 1397 DPRINTF("%s -> TC_TC\n", bp->bp_ifp->if_xname); 1398 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1399 break; 1400 1401 case BSTP_TCSTATE_PROPAG: 1402 /* flush routes on the parent bridge */ 1403 bp->bp_fdbflush = 1; 1404 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask); 1405 bp->bp_tc_prop = 0; 1406 bstp_set_timer_tc(bp); 1407 DPRINTF("%s -> TC_PROPAG\n", bp->bp_ifp->if_xname); 1408 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1409 break; 1410 1411 case BSTP_TCSTATE_ACK: 1412 bstp_timer_stop(&bp->bp_tc_timer); 1413 bp->bp_rcvdtca = 0; 1414 DPRINTF("%s -> TC_ACK\n", bp->bp_ifp->if_xname); 1415 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1416 break; 1417 } 1418 } 1419 1420 static void 1421 bstp_set_timer_tc(struct bstp_port *bp) 1422 { 1423 struct bstp_state *bs = bp->bp_bs; 1424 1425 if (bp->bp_tc_timer.active) 1426 return; 1427 1428 switch (bp->bp_protover) { 1429 case BSTP_PROTO_RSTP: 1430 bstp_timer_start(&bp->bp_tc_timer, 1431 bp->bp_desg_htime + BSTP_TICK_VAL); 1432 bp->bp_flags |= BSTP_PORT_NEWINFO; 1433 break; 1434 1435 case BSTP_PROTO_STP: 1436 bstp_timer_start(&bp->bp_tc_timer, 1437 bs->bs_root_max_age + bs->bs_root_fdelay); 1438 break; 1439 } 1440 } 1441 1442 static void 1443 bstp_set_timer_msgage(struct bstp_port *bp) 1444 { 1445 if (bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR <= 1446 bp->bp_port_max_age) { 1447 bstp_timer_start(&bp->bp_message_age_timer, 1448 bp->bp_port_htime * 3); 1449 } else 1450 /* expires immediately */ 1451 bstp_timer_start(&bp->bp_message_age_timer, 0); 1452 } 1453 1454 static int 1455 bstp_rerooted(struct bstp_state *bs, struct bstp_port *bp) 1456 { 1457 struct bstp_port *bp2; 1458 int rr_set = 0; 1459 1460 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1461 if (bp2 == bp) 1462 continue; 1463 if (bp2->bp_recent_root_timer.active) { 1464 rr_set = 1; 1465 break; 1466 } 1467 } 1468 return (!rr_set); 1469 } 1470 1471 int 1472 bstp_set_htime(struct bstp_state *bs, int t) 1473 { 1474 /* convert seconds to ticks */ 1475 t *= BSTP_TICK_VAL; 1476 1477 /* value can only be changed in leagacy stp mode */ 1478 if (bs->bs_protover != BSTP_PROTO_STP) 1479 return (EPERM); 1480 1481 if (t < BSTP_MIN_HELLO_TIME || t > BSTP_MAX_HELLO_TIME) 1482 return (EINVAL); 1483 1484 BSTP_LOCK(bs); 1485 bs->bs_bridge_htime = t; 1486 bstp_reinit(bs); 1487 BSTP_UNLOCK(bs); 1488 return (0); 1489 } 1490 1491 int 1492 bstp_set_fdelay(struct bstp_state *bs, int t) 1493 { 1494 /* convert seconds to ticks */ 1495 t *= BSTP_TICK_VAL; 1496 1497 if (t < BSTP_MIN_FORWARD_DELAY || t > BSTP_MAX_FORWARD_DELAY) 1498 return (EINVAL); 1499 1500 BSTP_LOCK(bs); 1501 bs->bs_bridge_fdelay = t; 1502 bstp_reinit(bs); 1503 BSTP_UNLOCK(bs); 1504 return (0); 1505 } 1506 1507 int 1508 bstp_set_maxage(struct bstp_state *bs, int t) 1509 { 1510 /* convert seconds to ticks */ 1511 t *= BSTP_TICK_VAL; 1512 1513 if (t < BSTP_MIN_MAX_AGE || t > BSTP_MAX_MAX_AGE) 1514 return (EINVAL); 1515 1516 BSTP_LOCK(bs); 1517 bs->bs_bridge_max_age = t; 1518 bstp_reinit(bs); 1519 BSTP_UNLOCK(bs); 1520 return (0); 1521 } 1522 1523 int 1524 bstp_set_holdcount(struct bstp_state *bs, int count) 1525 { 1526 struct bstp_port *bp; 1527 1528 if (count < BSTP_MIN_HOLD_COUNT || 1529 count > BSTP_MAX_HOLD_COUNT) 1530 return (EINVAL); 1531 1532 BSTP_LOCK(bs); 1533 bs->bs_txholdcount = count; 1534 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1535 bp->bp_txcount = 0; 1536 BSTP_UNLOCK(bs); 1537 return (0); 1538 } 1539 1540 int 1541 bstp_set_protocol(struct bstp_state *bs, int proto) 1542 { 1543 struct bstp_port *bp; 1544 1545 switch (proto) { 1546 /* Supported protocol versions */ 1547 case BSTP_PROTO_STP: 1548 case BSTP_PROTO_RSTP: 1549 break; 1550 1551 default: 1552 return (EINVAL); 1553 } 1554 1555 BSTP_LOCK(bs); 1556 bs->bs_protover = proto; 1557 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 1558 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1559 /* reinit state */ 1560 bp->bp_infois = BSTP_INFO_DISABLED; 1561 bp->bp_txcount = 0; 1562 bstp_set_port_proto(bp, bs->bs_protover); 1563 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 1564 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1565 bstp_timer_stop(&bp->bp_recent_backup_timer); 1566 } 1567 bstp_reinit(bs); 1568 BSTP_UNLOCK(bs); 1569 return (0); 1570 } 1571 1572 int 1573 bstp_set_priority(struct bstp_state *bs, int pri) 1574 { 1575 if (pri < 0 || pri > BSTP_MAX_PRIORITY) 1576 return (EINVAL); 1577 1578 /* Limit to steps of 4096 */ 1579 pri -= pri % 4096; 1580 1581 BSTP_LOCK(bs); 1582 bs->bs_bridge_priority = pri; 1583 bstp_reinit(bs); 1584 BSTP_UNLOCK(bs); 1585 return (0); 1586 } 1587 1588 int 1589 bstp_set_port_priority(struct bstp_port *bp, int pri) 1590 { 1591 struct bstp_state *bs = bp->bp_bs; 1592 1593 if (pri < 0 || pri > BSTP_MAX_PORT_PRIORITY) 1594 return (EINVAL); 1595 1596 /* Limit to steps of 16 */ 1597 pri -= pri % 16; 1598 1599 BSTP_LOCK(bs); 1600 bp->bp_priority = pri; 1601 bstp_reinit(bs); 1602 BSTP_UNLOCK(bs); 1603 return (0); 1604 } 1605 1606 int 1607 bstp_set_path_cost(struct bstp_port *bp, uint32_t path_cost) 1608 { 1609 struct bstp_state *bs = bp->bp_bs; 1610 1611 if (path_cost > BSTP_MAX_PATH_COST) 1612 return (EINVAL); 1613 1614 /* STP compat mode only uses 16 bits of the 32 */ 1615 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1616 path_cost = 65535; 1617 1618 BSTP_LOCK(bs); 1619 1620 if (path_cost == 0) { /* use auto */ 1621 bp->bp_flags &= ~BSTP_PORT_ADMCOST; 1622 bp->bp_path_cost = bstp_calc_path_cost(bp); 1623 } else { 1624 bp->bp_path_cost = path_cost; 1625 bp->bp_flags |= BSTP_PORT_ADMCOST; 1626 } 1627 bstp_reinit(bs); 1628 BSTP_UNLOCK(bs); 1629 return (0); 1630 } 1631 1632 int 1633 bstp_set_edge(struct bstp_port *bp, int set) 1634 { 1635 struct bstp_state *bs = bp->bp_bs; 1636 1637 BSTP_LOCK(bs); 1638 if ((bp->bp_operedge = set) == 0) 1639 bp->bp_flags &= ~BSTP_PORT_ADMEDGE; 1640 else 1641 bp->bp_flags |= BSTP_PORT_ADMEDGE; 1642 BSTP_UNLOCK(bs); 1643 return (0); 1644 } 1645 1646 int 1647 bstp_set_autoedge(struct bstp_port *bp, int set) 1648 { 1649 struct bstp_state *bs = bp->bp_bs; 1650 1651 BSTP_LOCK(bs); 1652 if (set) { 1653 bp->bp_flags |= BSTP_PORT_AUTOEDGE; 1654 /* we may be able to transition straight to edge */ 1655 if (bp->bp_edge_delay_timer.active == 0) 1656 bstp_edge_delay_expiry(bs, bp); 1657 } else 1658 bp->bp_flags &= ~BSTP_PORT_AUTOEDGE; 1659 BSTP_UNLOCK(bs); 1660 return (0); 1661 } 1662 1663 int 1664 bstp_set_ptp(struct bstp_port *bp, int set) 1665 { 1666 struct bstp_state *bs = bp->bp_bs; 1667 1668 BSTP_LOCK(bs); 1669 bp->bp_ptp_link = set; 1670 BSTP_UNLOCK(bs); 1671 return (0); 1672 } 1673 1674 int 1675 bstp_set_autoptp(struct bstp_port *bp, int set) 1676 { 1677 struct bstp_state *bs = bp->bp_bs; 1678 1679 BSTP_LOCK(bs); 1680 if (set) { 1681 bp->bp_flags |= BSTP_PORT_AUTOPTP; 1682 if (bp->bp_role != BSTP_ROLE_DISABLED) 1683 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 1684 } else 1685 bp->bp_flags &= ~BSTP_PORT_AUTOPTP; 1686 BSTP_UNLOCK(bs); 1687 return (0); 1688 } 1689 1690 /* 1691 * Calculate the path cost according to the link speed. 1692 */ 1693 static uint32_t 1694 bstp_calc_path_cost(struct bstp_port *bp) 1695 { 1696 struct ifnet *ifp = bp->bp_ifp; 1697 uint32_t path_cost; 1698 1699 /* If the priority has been manually set then retain the value */ 1700 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1701 return bp->bp_path_cost; 1702 1703 if (ifp->if_link_state == LINK_STATE_DOWN) { 1704 /* Recalc when the link comes up again */ 1705 bp->bp_flags |= BSTP_PORT_PNDCOST; 1706 return (BSTP_DEFAULT_PATH_COST); 1707 } 1708 1709 if (ifp->if_baudrate < 1000) 1710 return (BSTP_DEFAULT_PATH_COST); 1711 1712 /* formula from section 17.14, IEEE Std 802.1D-2004 */ 1713 path_cost = 20000000000ULL / (ifp->if_baudrate / 1000); 1714 1715 if (path_cost > BSTP_MAX_PATH_COST) 1716 path_cost = BSTP_MAX_PATH_COST; 1717 1718 /* STP compat mode only uses 16 bits of the 32 */ 1719 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1720 path_cost = 65535; 1721 1722 return (path_cost); 1723 } 1724 1725 /* 1726 * Notify the bridge that a port state has changed, we need to do this from a 1727 * taskqueue to avoid a LOR. 1728 */ 1729 static void 1730 bstp_notify_state(void *arg, int pending) 1731 { 1732 struct bstp_port *bp = (struct bstp_port *)arg; 1733 struct bstp_state *bs = bp->bp_bs; 1734 1735 if (bp->bp_active == 1 && bs->bs_state_cb != NULL) 1736 (*bs->bs_state_cb)(bp->bp_ifp, bp->bp_state); 1737 } 1738 1739 /* 1740 * Flush the routes on the bridge port, we need to do this from a 1741 * taskqueue to avoid a LOR. 1742 */ 1743 static void 1744 bstp_notify_rtage(void *arg, int pending) 1745 { 1746 struct bstp_port *bp = (struct bstp_port *)arg; 1747 struct bstp_state *bs = bp->bp_bs; 1748 int age = 0; 1749 1750 BSTP_LOCK(bs); 1751 switch (bp->bp_protover) { 1752 case BSTP_PROTO_STP: 1753 /* convert to seconds */ 1754 age = bp->bp_desg_fdelay / BSTP_TICK_VAL; 1755 break; 1756 1757 case BSTP_PROTO_RSTP: 1758 age = 0; 1759 break; 1760 } 1761 BSTP_UNLOCK(bs); 1762 1763 if (bp->bp_active == 1 && bs->bs_rtage_cb != NULL) 1764 (*bs->bs_rtage_cb)(bp->bp_ifp, age); 1765 1766 /* flush is complete */ 1767 BSTP_LOCK(bs); 1768 bp->bp_fdbflush = 0; 1769 BSTP_UNLOCK(bs); 1770 } 1771 1772 void 1773 bstp_linkstate(struct bstp_port *bp) 1774 { 1775 struct bstp_state *bs = bp->bp_bs; 1776 1777 if (!bp->bp_active) 1778 return; 1779 1780 bstp_ifupdstatus(bp, 0); 1781 BSTP_LOCK(bs); 1782 bstp_update_state(bs, bp); 1783 BSTP_UNLOCK(bs); 1784 } 1785 1786 static void 1787 bstp_ifupdstatus(void *arg, int pending) 1788 { 1789 struct bstp_port *bp = (struct bstp_port *)arg; 1790 struct bstp_state *bs = bp->bp_bs; 1791 struct ifnet *ifp = bp->bp_ifp; 1792 struct ifmediareq ifmr; 1793 int error, changed; 1794 1795 if (!bp->bp_active) 1796 return; 1797 1798 bzero((char *)&ifmr, sizeof(ifmr)); 1799 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr); 1800 1801 BSTP_LOCK(bs); 1802 changed = 0; 1803 if ((error == 0) && (ifp->if_flags & IFF_UP)) { 1804 if (ifmr.ifm_status & IFM_ACTIVE) { 1805 /* A full-duplex link is assumed to be point to point */ 1806 if (bp->bp_flags & BSTP_PORT_AUTOPTP) { 1807 int fdx; 1808 1809 fdx = ifmr.ifm_active & IFM_FDX ? 1 : 0; 1810 if (bp->bp_ptp_link ^ fdx) { 1811 bp->bp_ptp_link = fdx; 1812 changed = 1; 1813 } 1814 } 1815 1816 /* Calc the cost if the link was down previously */ 1817 if (bp->bp_flags & BSTP_PORT_PNDCOST) { 1818 uint32_t cost; 1819 1820 cost = bstp_calc_path_cost(bp); 1821 if (bp->bp_path_cost != cost) { 1822 bp->bp_path_cost = cost; 1823 changed = 1; 1824 } 1825 bp->bp_flags &= ~BSTP_PORT_PNDCOST; 1826 } 1827 1828 if (bp->bp_role == BSTP_ROLE_DISABLED) { 1829 bstp_enable_port(bs, bp); 1830 changed = 1; 1831 } 1832 } else { 1833 if (bp->bp_role != BSTP_ROLE_DISABLED) { 1834 bstp_disable_port(bs, bp); 1835 changed = 1; 1836 if ((bp->bp_flags & BSTP_PORT_ADMEDGE) && 1837 bp->bp_protover == BSTP_PROTO_RSTP) 1838 bp->bp_operedge = 1; 1839 } 1840 } 1841 } else if (bp->bp_infois != BSTP_INFO_DISABLED) { 1842 bstp_disable_port(bs, bp); 1843 changed = 1; 1844 } 1845 if (changed) 1846 bstp_assign_roles(bs); 1847 BSTP_UNLOCK(bs); 1848 } 1849 1850 static void 1851 bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp) 1852 { 1853 bp->bp_infois = BSTP_INFO_AGED; 1854 } 1855 1856 static void 1857 bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp) 1858 { 1859 bp->bp_infois = BSTP_INFO_DISABLED; 1860 } 1861 1862 static void 1863 bstp_tick(void *arg) 1864 { 1865 struct bstp_state *bs = arg; 1866 struct bstp_port *bp; 1867 1868 BSTP_LOCK_ASSERT(bs); 1869 1870 if (bs->bs_running == 0) 1871 return; 1872 1873 CURVNET_SET(bs->bs_vnet); 1874 1875 /* poll link events on interfaces that do not support linkstate */ 1876 if (bstp_timer_dectest(&bs->bs_link_timer)) { 1877 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1878 if (!(bp->bp_ifp->if_capabilities & IFCAP_LINKSTATE)) 1879 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 1880 } 1881 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 1882 } 1883 1884 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1885 /* no events need to happen for these */ 1886 bstp_timer_dectest(&bp->bp_tc_timer); 1887 bstp_timer_dectest(&bp->bp_recent_root_timer); 1888 bstp_timer_dectest(&bp->bp_forward_delay_timer); 1889 bstp_timer_dectest(&bp->bp_recent_backup_timer); 1890 1891 if (bstp_timer_dectest(&bp->bp_hello_timer)) 1892 bstp_hello_timer_expiry(bs, bp); 1893 1894 if (bstp_timer_dectest(&bp->bp_message_age_timer)) 1895 bstp_message_age_expiry(bs, bp); 1896 1897 if (bstp_timer_dectest(&bp->bp_migrate_delay_timer)) 1898 bstp_migrate_delay_expiry(bs, bp); 1899 1900 if (bstp_timer_dectest(&bp->bp_edge_delay_timer)) 1901 bstp_edge_delay_expiry(bs, bp); 1902 1903 /* update the various state machines for the port */ 1904 bstp_update_state(bs, bp); 1905 1906 if (bp->bp_txcount > 0) 1907 bp->bp_txcount--; 1908 } 1909 1910 CURVNET_RESTORE(); 1911 1912 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 1913 } 1914 1915 static void 1916 bstp_timer_start(struct bstp_timer *t, uint16_t v) 1917 { 1918 t->value = v; 1919 t->active = 1; 1920 t->latched = 0; 1921 } 1922 1923 static void 1924 bstp_timer_stop(struct bstp_timer *t) 1925 { 1926 t->value = 0; 1927 t->active = 0; 1928 t->latched = 0; 1929 } 1930 1931 static void 1932 bstp_timer_latch(struct bstp_timer *t) 1933 { 1934 t->latched = 1; 1935 t->active = 1; 1936 } 1937 1938 static int 1939 bstp_timer_dectest(struct bstp_timer *t) 1940 { 1941 if (t->active == 0 || t->latched) 1942 return (0); 1943 t->value -= BSTP_TICK_VAL; 1944 if (t->value <= 0) { 1945 bstp_timer_stop(t); 1946 return (1); 1947 } 1948 return (0); 1949 } 1950 1951 static void 1952 bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp) 1953 { 1954 if ((bp->bp_flags & BSTP_PORT_NEWINFO) || 1955 bp->bp_role == BSTP_ROLE_DESIGNATED || 1956 (bp->bp_role == BSTP_ROLE_ROOT && 1957 bp->bp_tc_timer.active == 1)) { 1958 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 1959 bp->bp_flags |= BSTP_PORT_NEWINFO; 1960 bstp_transmit(bs, bp); 1961 } 1962 } 1963 1964 static void 1965 bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp) 1966 { 1967 if (bp->bp_infois == BSTP_INFO_RECEIVED) { 1968 bp->bp_infois = BSTP_INFO_AGED; 1969 bstp_assign_roles(bs); 1970 DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname); 1971 } 1972 } 1973 1974 static void 1975 bstp_migrate_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 1976 { 1977 bp->bp_flags |= BSTP_PORT_CANMIGRATE; 1978 } 1979 1980 static void 1981 bstp_edge_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 1982 { 1983 if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) && 1984 bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing && 1985 bp->bp_role == BSTP_ROLE_DESIGNATED) { 1986 bp->bp_operedge = 1; 1987 DPRINTF("%s -> edge port\n", bp->bp_ifp->if_xname); 1988 } 1989 } 1990 1991 static int 1992 bstp_addr_cmp(const uint8_t *a, const uint8_t *b) 1993 { 1994 int i, d; 1995 1996 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 1997 d = ((int)a[i]) - ((int)b[i]); 1998 } 1999 2000 return (d); 2001 } 2002 2003 /* 2004 * compare the bridge address component of the bridgeid 2005 */ 2006 static int 2007 bstp_same_bridgeid(uint64_t id1, uint64_t id2) 2008 { 2009 u_char addr1[ETHER_ADDR_LEN]; 2010 u_char addr2[ETHER_ADDR_LEN]; 2011 2012 PV2ADDR(id1, addr1); 2013 PV2ADDR(id2, addr2); 2014 2015 if (bstp_addr_cmp(addr1, addr2) == 0) 2016 return (1); 2017 2018 return (0); 2019 } 2020 2021 void 2022 bstp_reinit(struct bstp_state *bs) 2023 { 2024 struct epoch_tracker et; 2025 struct bstp_port *bp; 2026 struct ifnet *ifp, *mif; 2027 u_char *e_addr; 2028 void *bridgeptr; 2029 static const u_char llzero[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 2030 2031 BSTP_LOCK_ASSERT(bs); 2032 2033 if (LIST_EMPTY(&bs->bs_bplist)) 2034 goto disablestp; 2035 2036 mif = NULL; 2037 bridgeptr = LIST_FIRST(&bs->bs_bplist)->bp_ifp->if_bridge; 2038 KASSERT(bridgeptr != NULL, ("Invalid bridge pointer")); 2039 /* 2040 * Search through the Ethernet adapters and find the one with the 2041 * lowest value. Make sure the adapter which we take the MAC address 2042 * from is part of this bridge, so we can have more than one independent 2043 * bridges in the same STP domain. 2044 */ 2045 NET_EPOCH_ENTER(et); 2046 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2047 if (ifp->if_type != IFT_ETHER) 2048 continue; /* Not Ethernet */ 2049 2050 if (ifp->if_bridge != bridgeptr) 2051 continue; /* Not part of our bridge */ 2052 2053 if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0) 2054 continue; /* No mac address set */ 2055 2056 if (mif == NULL) { 2057 mif = ifp; 2058 continue; 2059 } 2060 if (bstp_addr_cmp(IF_LLADDR(ifp), IF_LLADDR(mif)) < 0) { 2061 mif = ifp; 2062 continue; 2063 } 2064 } 2065 NET_EPOCH_EXIT(et); 2066 if (mif == NULL) 2067 goto disablestp; 2068 2069 e_addr = IF_LLADDR(mif); 2070 bs->bs_bridge_pv.pv_dbridge_id = 2071 (((uint64_t)bs->bs_bridge_priority) << 48) | 2072 (((uint64_t)e_addr[0]) << 40) | 2073 (((uint64_t)e_addr[1]) << 32) | 2074 (((uint64_t)e_addr[2]) << 24) | 2075 (((uint64_t)e_addr[3]) << 16) | 2076 (((uint64_t)e_addr[4]) << 8) | 2077 (((uint64_t)e_addr[5])); 2078 2079 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2080 bs->bs_bridge_pv.pv_cost = 0; 2081 bs->bs_bridge_pv.pv_dport_id = 0; 2082 bs->bs_bridge_pv.pv_port_id = 0; 2083 2084 if (bs->bs_running && callout_pending(&bs->bs_bstpcallout) == 0) 2085 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2086 2087 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2088 bp->bp_port_id = (bp->bp_priority << 8) | 2089 (bp->bp_ifp->if_index & 0xfff); 2090 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 2091 } 2092 2093 bstp_assign_roles(bs); 2094 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 2095 return; 2096 2097 disablestp: 2098 /* Set the bridge and root id (lower bits) to zero */ 2099 bs->bs_bridge_pv.pv_dbridge_id = 2100 ((uint64_t)bs->bs_bridge_priority) << 48; 2101 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2102 bs->bs_root_pv = bs->bs_bridge_pv; 2103 /* Disable any remaining ports, they will have no MAC address */ 2104 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2105 bp->bp_infois = BSTP_INFO_DISABLED; 2106 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2107 } 2108 callout_stop(&bs->bs_bstpcallout); 2109 } 2110 2111 static int 2112 bstp_modevent(module_t mod, int type, void *data) 2113 { 2114 switch (type) { 2115 case MOD_LOAD: 2116 mtx_init(&bstp_list_mtx, "bridgestp list", NULL, MTX_DEF); 2117 LIST_INIT(&bstp_list); 2118 break; 2119 case MOD_UNLOAD: 2120 mtx_destroy(&bstp_list_mtx); 2121 break; 2122 default: 2123 return (EOPNOTSUPP); 2124 } 2125 return (0); 2126 } 2127 2128 static moduledata_t bstp_mod = { 2129 "bridgestp", 2130 bstp_modevent, 2131 0 2132 }; 2133 2134 DECLARE_MODULE(bridgestp, bstp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2135 MODULE_VERSION(bridgestp, 1); 2136 2137 void 2138 bstp_attach(struct bstp_state *bs, struct bstp_cb_ops *cb) 2139 { 2140 BSTP_LOCK_INIT(bs); 2141 callout_init_mtx(&bs->bs_bstpcallout, &bs->bs_mtx, 0); 2142 LIST_INIT(&bs->bs_bplist); 2143 2144 bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 2145 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 2146 bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY; 2147 bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 2148 bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME; 2149 bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY; 2150 bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT; 2151 bs->bs_protover = BSTP_PROTO_RSTP; 2152 bs->bs_state_cb = cb->bcb_state; 2153 bs->bs_rtage_cb = cb->bcb_rtage; 2154 bs->bs_vnet = curvnet; 2155 2156 getmicrotime(&bs->bs_last_tc_time); 2157 2158 mtx_lock(&bstp_list_mtx); 2159 LIST_INSERT_HEAD(&bstp_list, bs, bs_list); 2160 mtx_unlock(&bstp_list_mtx); 2161 } 2162 2163 void 2164 bstp_detach(struct bstp_state *bs) 2165 { 2166 KASSERT(LIST_EMPTY(&bs->bs_bplist), ("bstp still active")); 2167 2168 mtx_lock(&bstp_list_mtx); 2169 LIST_REMOVE(bs, bs_list); 2170 mtx_unlock(&bstp_list_mtx); 2171 callout_drain(&bs->bs_bstpcallout); 2172 BSTP_LOCK_DESTROY(bs); 2173 } 2174 2175 void 2176 bstp_init(struct bstp_state *bs) 2177 { 2178 BSTP_LOCK(bs); 2179 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2180 bs->bs_running = 1; 2181 bstp_reinit(bs); 2182 BSTP_UNLOCK(bs); 2183 } 2184 2185 void 2186 bstp_stop(struct bstp_state *bs) 2187 { 2188 struct bstp_port *bp; 2189 2190 BSTP_LOCK(bs); 2191 2192 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 2193 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2194 2195 bs->bs_running = 0; 2196 callout_stop(&bs->bs_bstpcallout); 2197 BSTP_UNLOCK(bs); 2198 } 2199 2200 int 2201 bstp_create(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *ifp) 2202 { 2203 bzero(bp, sizeof(struct bstp_port)); 2204 2205 BSTP_LOCK(bs); 2206 bp->bp_ifp = ifp; 2207 bp->bp_bs = bs; 2208 bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY; 2209 TASK_INIT(&bp->bp_statetask, 0, bstp_notify_state, bp); 2210 TASK_INIT(&bp->bp_rtagetask, 0, bstp_notify_rtage, bp); 2211 TASK_INIT(&bp->bp_mediatask, 0, bstp_ifupdstatus, bp); 2212 2213 /* Init state */ 2214 bp->bp_infois = BSTP_INFO_DISABLED; 2215 bp->bp_flags = BSTP_PORT_AUTOEDGE|BSTP_PORT_AUTOPTP; 2216 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2217 bstp_set_port_proto(bp, bs->bs_protover); 2218 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2219 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 2220 bp->bp_path_cost = bstp_calc_path_cost(bp); 2221 BSTP_UNLOCK(bs); 2222 return (0); 2223 } 2224 2225 int 2226 bstp_enable(struct bstp_port *bp) 2227 { 2228 struct bstp_state *bs = bp->bp_bs; 2229 struct ifnet *ifp = bp->bp_ifp; 2230 2231 KASSERT(bp->bp_active == 0, ("already a bstp member")); 2232 2233 switch (ifp->if_type) { 2234 case IFT_ETHER: /* These can do spanning tree. */ 2235 break; 2236 default: 2237 /* Nothing else can. */ 2238 return (EINVAL); 2239 } 2240 2241 BSTP_LOCK(bs); 2242 LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next); 2243 bp->bp_active = 1; 2244 bp->bp_flags |= BSTP_PORT_NEWINFO; 2245 bstp_reinit(bs); 2246 bstp_update_roles(bs, bp); 2247 BSTP_UNLOCK(bs); 2248 return (0); 2249 } 2250 2251 void 2252 bstp_disable(struct bstp_port *bp) 2253 { 2254 struct bstp_state *bs = bp->bp_bs; 2255 2256 KASSERT(bp->bp_active == 1, ("not a bstp member")); 2257 2258 BSTP_LOCK(bs); 2259 bstp_disable_port(bs, bp); 2260 LIST_REMOVE(bp, bp_next); 2261 bp->bp_active = 0; 2262 bstp_reinit(bs); 2263 BSTP_UNLOCK(bs); 2264 } 2265 2266 /* 2267 * The bstp_port structure is about to be freed by the parent bridge. 2268 */ 2269 void 2270 bstp_destroy(struct bstp_port *bp) 2271 { 2272 KASSERT(bp->bp_active == 0, ("port is still attached")); 2273 taskqueue_drain(taskqueue_swi, &bp->bp_statetask); 2274 taskqueue_drain(taskqueue_swi, &bp->bp_rtagetask); 2275 taskqueue_drain(taskqueue_swi, &bp->bp_mediatask); 2276 2277 if (bp->bp_bs->bs_root_port == bp) 2278 bstp_assign_roles(bp->bp_bs); 2279 } 2280