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 NET_EPOCH_ASSERT(); 158 159 if (bs->bs_running == 0) 160 return; 161 162 /* 163 * a PDU can only be sent if we have tx quota left and the 164 * hello timer is running. 165 */ 166 if (bp->bp_hello_timer.active == 0) { 167 /* Test if it needs to be reset */ 168 bstp_hello_timer_expiry(bs, bp); 169 return; 170 } 171 if (bp->bp_txcount > bs->bs_txholdcount) 172 /* Ran out of karma */ 173 return; 174 175 if (bp->bp_protover == BSTP_PROTO_RSTP) { 176 bstp_transmit_bpdu(bs, bp); 177 bp->bp_tc_ack = 0; 178 } else { /* STP */ 179 switch (bp->bp_role) { 180 case BSTP_ROLE_DESIGNATED: 181 bstp_transmit_bpdu(bs, bp); 182 bp->bp_tc_ack = 0; 183 break; 184 185 case BSTP_ROLE_ROOT: 186 bstp_transmit_tcn(bs, bp); 187 break; 188 } 189 } 190 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 191 bp->bp_flags &= ~BSTP_PORT_NEWINFO; 192 } 193 194 static void 195 bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp) 196 { 197 struct bstp_cbpdu bpdu; 198 199 BSTP_LOCK_ASSERT(bs); 200 201 bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48); 202 PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr); 203 204 bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost); 205 206 bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48); 207 PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr); 208 209 bpdu.cbu_portid = htons(bp->bp_port_id); 210 bpdu.cbu_messageage = htons(bp->bp_desg_msg_age); 211 bpdu.cbu_maxage = htons(bp->bp_desg_max_age); 212 bpdu.cbu_hellotime = htons(bp->bp_desg_htime); 213 bpdu.cbu_forwarddelay = htons(bp->bp_desg_fdelay); 214 215 bpdu.cbu_flags = bstp_pdu_flags(bp); 216 217 switch (bp->bp_protover) { 218 case BSTP_PROTO_STP: 219 bpdu.cbu_bpdutype = BSTP_MSGTYPE_CFG; 220 break; 221 222 case BSTP_PROTO_RSTP: 223 bpdu.cbu_bpdutype = BSTP_MSGTYPE_RSTP; 224 break; 225 } 226 227 bstp_send_bpdu(bs, bp, &bpdu); 228 } 229 230 static void 231 bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp) 232 { 233 struct bstp_tbpdu bpdu; 234 struct ifnet *ifp = bp->bp_ifp; 235 struct ether_header *eh; 236 struct mbuf *m; 237 238 KASSERT(bp == bs->bs_root_port, ("%s: bad root port\n", __func__)); 239 240 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 241 return; 242 243 m = m_gethdr(M_NOWAIT, MT_DATA); 244 if (m == NULL) 245 return; 246 247 m->m_pkthdr.rcvif = ifp; 248 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); 249 m->m_len = m->m_pkthdr.len; 250 251 eh = mtod(m, struct ether_header *); 252 253 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); 254 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 255 eh->ether_type = htons(sizeof(bpdu)); 256 257 bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP; 258 bpdu.tbu_ctl = LLC_UI; 259 bpdu.tbu_protoid = 0; 260 bpdu.tbu_protover = 0; 261 bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN; 262 263 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu)); 264 265 bp->bp_txcount++; 266 ifp->if_transmit(ifp, m); 267 } 268 269 static void 270 bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu, 271 struct bstp_config_unit *cu) 272 { 273 int flags; 274 275 cu->cu_pv.pv_root_id = 276 (((uint64_t)ntohs(cpdu->cbu_rootpri)) << 48) | 277 (((uint64_t)cpdu->cbu_rootaddr[0]) << 40) | 278 (((uint64_t)cpdu->cbu_rootaddr[1]) << 32) | 279 (((uint64_t)cpdu->cbu_rootaddr[2]) << 24) | 280 (((uint64_t)cpdu->cbu_rootaddr[3]) << 16) | 281 (((uint64_t)cpdu->cbu_rootaddr[4]) << 8) | 282 (((uint64_t)cpdu->cbu_rootaddr[5]) << 0); 283 284 cu->cu_pv.pv_dbridge_id = 285 (((uint64_t)ntohs(cpdu->cbu_bridgepri)) << 48) | 286 (((uint64_t)cpdu->cbu_bridgeaddr[0]) << 40) | 287 (((uint64_t)cpdu->cbu_bridgeaddr[1]) << 32) | 288 (((uint64_t)cpdu->cbu_bridgeaddr[2]) << 24) | 289 (((uint64_t)cpdu->cbu_bridgeaddr[3]) << 16) | 290 (((uint64_t)cpdu->cbu_bridgeaddr[4]) << 8) | 291 (((uint64_t)cpdu->cbu_bridgeaddr[5]) << 0); 292 293 cu->cu_pv.pv_cost = ntohl(cpdu->cbu_rootpathcost); 294 cu->cu_message_age = ntohs(cpdu->cbu_messageage); 295 cu->cu_max_age = ntohs(cpdu->cbu_maxage); 296 cu->cu_hello_time = ntohs(cpdu->cbu_hellotime); 297 cu->cu_forward_delay = ntohs(cpdu->cbu_forwarddelay); 298 cu->cu_pv.pv_dport_id = ntohs(cpdu->cbu_portid); 299 cu->cu_pv.pv_port_id = bp->bp_port_id; 300 cu->cu_message_type = cpdu->cbu_bpdutype; 301 302 /* Strip off unused flags in STP mode */ 303 flags = cpdu->cbu_flags; 304 switch (cpdu->cbu_protover) { 305 case BSTP_PROTO_STP: 306 flags &= BSTP_PDU_STPMASK; 307 /* A STP BPDU explicitly conveys a Designated Port */ 308 cu->cu_role = BSTP_ROLE_DESIGNATED; 309 break; 310 311 case BSTP_PROTO_RSTP: 312 flags &= BSTP_PDU_RSTPMASK; 313 break; 314 } 315 316 cu->cu_topology_change_ack = 317 (flags & BSTP_PDU_F_TCA) ? 1 : 0; 318 cu->cu_proposal = 319 (flags & BSTP_PDU_F_P) ? 1 : 0; 320 cu->cu_agree = 321 (flags & BSTP_PDU_F_A) ? 1 : 0; 322 cu->cu_learning = 323 (flags & BSTP_PDU_F_L) ? 1 : 0; 324 cu->cu_forwarding = 325 (flags & BSTP_PDU_F_F) ? 1 : 0; 326 cu->cu_topology_change = 327 (flags & BSTP_PDU_F_TC) ? 1 : 0; 328 329 switch ((flags & BSTP_PDU_PRMASK) >> BSTP_PDU_PRSHIFT) { 330 case BSTP_PDU_F_ROOT: 331 cu->cu_role = BSTP_ROLE_ROOT; 332 break; 333 case BSTP_PDU_F_ALT: 334 cu->cu_role = BSTP_ROLE_ALTERNATE; 335 break; 336 case BSTP_PDU_F_DESG: 337 cu->cu_role = BSTP_ROLE_DESIGNATED; 338 break; 339 } 340 } 341 342 static void 343 bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp, 344 struct bstp_cbpdu *bpdu) 345 { 346 struct ifnet *ifp; 347 struct mbuf *m; 348 struct ether_header *eh; 349 350 BSTP_LOCK_ASSERT(bs); 351 NET_EPOCH_ASSERT(); 352 353 ifp = bp->bp_ifp; 354 355 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 356 return; 357 358 m = m_gethdr(M_NOWAIT, MT_DATA); 359 if (m == NULL) 360 return; 361 362 eh = mtod(m, struct ether_header *); 363 364 bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP; 365 bpdu->cbu_ctl = LLC_UI; 366 bpdu->cbu_protoid = htons(BSTP_PROTO_ID); 367 368 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); 369 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 370 371 switch (bpdu->cbu_bpdutype) { 372 case BSTP_MSGTYPE_CFG: 373 bpdu->cbu_protover = BSTP_PROTO_STP; 374 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_STP_LEN; 375 eh->ether_type = htons(BSTP_BPDU_STP_LEN); 376 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, 377 BSTP_BPDU_STP_LEN); 378 break; 379 380 case BSTP_MSGTYPE_RSTP: 381 bpdu->cbu_protover = BSTP_PROTO_RSTP; 382 bpdu->cbu_versionlen = htons(0); 383 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_RSTP_LEN; 384 eh->ether_type = htons(BSTP_BPDU_RSTP_LEN); 385 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, 386 BSTP_BPDU_RSTP_LEN); 387 break; 388 389 default: 390 panic("not implemented"); 391 } 392 m->m_pkthdr.rcvif = ifp; 393 m->m_len = m->m_pkthdr.len; 394 395 bp->bp_txcount++; 396 ifp->if_transmit(ifp, m); 397 } 398 399 static int 400 bstp_pdu_flags(struct bstp_port *bp) 401 { 402 int flags = 0; 403 404 if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING) 405 flags |= BSTP_PDU_F_P; 406 407 if (bp->bp_agree) 408 flags |= BSTP_PDU_F_A; 409 410 if (bp->bp_tc_timer.active) 411 flags |= BSTP_PDU_F_TC; 412 413 if (bp->bp_tc_ack) 414 flags |= BSTP_PDU_F_TCA; 415 416 switch (bp->bp_state) { 417 case BSTP_IFSTATE_LEARNING: 418 flags |= BSTP_PDU_F_L; 419 break; 420 421 case BSTP_IFSTATE_FORWARDING: 422 flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F); 423 break; 424 } 425 426 switch (bp->bp_role) { 427 case BSTP_ROLE_ROOT: 428 flags |= 429 (BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT); 430 break; 431 432 case BSTP_ROLE_ALTERNATE: 433 case BSTP_ROLE_BACKUP: /* fall through */ 434 flags |= 435 (BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT); 436 break; 437 438 case BSTP_ROLE_DESIGNATED: 439 flags |= 440 (BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT); 441 break; 442 } 443 444 /* Strip off unused flags in either mode */ 445 switch (bp->bp_protover) { 446 case BSTP_PROTO_STP: 447 flags &= BSTP_PDU_STPMASK; 448 break; 449 case BSTP_PROTO_RSTP: 450 flags &= BSTP_PDU_RSTPMASK; 451 break; 452 } 453 return (flags); 454 } 455 456 void 457 bstp_input(struct bstp_port *bp, struct ifnet *ifp, struct mbuf *m) 458 { 459 struct bstp_state *bs = bp->bp_bs; 460 struct ether_header *eh; 461 struct bstp_tbpdu tpdu; 462 uint16_t len; 463 464 if (bp->bp_active == 0) { 465 m_freem(m); 466 return; 467 } 468 469 BSTP_LOCK(bs); 470 471 eh = mtod(m, struct ether_header *); 472 473 len = ntohs(eh->ether_type); 474 if (len < sizeof(tpdu)) 475 goto out; 476 477 m_adj(m, ETHER_HDR_LEN); 478 479 if (m->m_pkthdr.len > len) 480 m_adj(m, len - m->m_pkthdr.len); 481 if (m->m_len < sizeof(tpdu) && 482 (m = m_pullup(m, sizeof(tpdu))) == NULL) 483 goto out; 484 485 memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu)); 486 487 /* basic packet checks */ 488 if (tpdu.tbu_dsap != LLC_8021D_LSAP || 489 tpdu.tbu_ssap != LLC_8021D_LSAP || 490 tpdu.tbu_ctl != LLC_UI) 491 goto out; 492 if (tpdu.tbu_protoid != BSTP_PROTO_ID) 493 goto out; 494 495 /* 496 * We can treat later versions of the PDU as the same as the maximum 497 * version we implement. All additional parameters/flags are ignored. 498 */ 499 if (tpdu.tbu_protover > BSTP_PROTO_MAX) 500 tpdu.tbu_protover = BSTP_PROTO_MAX; 501 502 if (tpdu.tbu_protover != bp->bp_protover) { 503 /* 504 * Wait for the migration delay timer to expire before changing 505 * protocol version to avoid flip-flops. 506 */ 507 if (bp->bp_flags & BSTP_PORT_CANMIGRATE) 508 bstp_set_port_proto(bp, tpdu.tbu_protover); 509 else 510 goto out; 511 } 512 513 /* Clear operedge upon receiving a PDU on the port */ 514 bp->bp_operedge = 0; 515 bstp_timer_start(&bp->bp_edge_delay_timer, 516 BSTP_DEFAULT_MIGRATE_DELAY); 517 518 switch (tpdu.tbu_protover) { 519 case BSTP_PROTO_STP: 520 bstp_received_stp(bs, bp, &m, &tpdu); 521 break; 522 523 case BSTP_PROTO_RSTP: 524 bstp_received_rstp(bs, bp, &m, &tpdu); 525 break; 526 } 527 out: 528 BSTP_UNLOCK(bs); 529 if (m) 530 m_freem(m); 531 } 532 533 static void 534 bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp, 535 struct mbuf **mp, struct bstp_tbpdu *tpdu) 536 { 537 struct bstp_cbpdu cpdu; 538 struct bstp_config_unit *cu = &bp->bp_msg_cu; 539 struct bstp_tcn_unit tu; 540 541 switch (tpdu->tbu_bpdutype) { 542 case BSTP_MSGTYPE_TCN: 543 tu.tu_message_type = tpdu->tbu_bpdutype; 544 bstp_received_tcn(bs, bp, &tu); 545 break; 546 case BSTP_MSGTYPE_CFG: 547 if ((*mp)->m_len < BSTP_BPDU_STP_LEN && 548 (*mp = m_pullup(*mp, BSTP_BPDU_STP_LEN)) == NULL) 549 return; 550 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_STP_LEN); 551 552 bstp_decode_bpdu(bp, &cpdu, cu); 553 bstp_received_bpdu(bs, bp, cu); 554 break; 555 } 556 } 557 558 static void 559 bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp, 560 struct mbuf **mp, struct bstp_tbpdu *tpdu) 561 { 562 struct bstp_cbpdu cpdu; 563 struct bstp_config_unit *cu = &bp->bp_msg_cu; 564 565 if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP) 566 return; 567 568 if ((*mp)->m_len < BSTP_BPDU_RSTP_LEN && 569 (*mp = m_pullup(*mp, BSTP_BPDU_RSTP_LEN)) == NULL) 570 return; 571 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_RSTP_LEN); 572 573 bstp_decode_bpdu(bp, &cpdu, cu); 574 bstp_received_bpdu(bs, bp, cu); 575 } 576 577 static void 578 bstp_received_tcn(struct bstp_state *bs, struct bstp_port *bp, 579 struct bstp_tcn_unit *tcn) 580 { 581 bp->bp_rcvdtcn = 1; 582 bstp_update_tc(bp); 583 } 584 585 static void 586 bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp, 587 struct bstp_config_unit *cu) 588 { 589 int type; 590 591 BSTP_LOCK_ASSERT(bs); 592 593 /* We need to have transitioned to INFO_MINE before proceeding */ 594 switch (bp->bp_infois) { 595 case BSTP_INFO_DISABLED: 596 case BSTP_INFO_AGED: 597 return; 598 } 599 600 /* range checks */ 601 if (cu->cu_message_age >= cu->cu_max_age) { 602 return; 603 } 604 if (cu->cu_max_age < BSTP_MIN_MAX_AGE || 605 cu->cu_max_age > BSTP_MAX_MAX_AGE) { 606 return; 607 } 608 if (cu->cu_forward_delay < BSTP_MIN_FORWARD_DELAY || 609 cu->cu_forward_delay > BSTP_MAX_FORWARD_DELAY) { 610 return; 611 } 612 if (cu->cu_hello_time < BSTP_MIN_HELLO_TIME || 613 cu->cu_hello_time > BSTP_MAX_HELLO_TIME) { 614 return; 615 } 616 617 type = bstp_pdu_rcvtype(bp, cu); 618 619 switch (type) { 620 case BSTP_PDU_SUPERIOR: 621 bs->bs_allsynced = 0; 622 bp->bp_agreed = 0; 623 bp->bp_proposing = 0; 624 625 if (cu->cu_proposal && cu->cu_forwarding == 0) 626 bp->bp_proposed = 1; 627 if (cu->cu_topology_change) 628 bp->bp_rcvdtc = 1; 629 if (cu->cu_topology_change_ack) 630 bp->bp_rcvdtca = 1; 631 632 if (bp->bp_agree && 633 !bstp_pdu_bettersame(bp, BSTP_INFO_RECEIVED)) 634 bp->bp_agree = 0; 635 636 /* copy the received priority and timers to the port */ 637 bp->bp_port_pv = cu->cu_pv; 638 bp->bp_port_msg_age = cu->cu_message_age; 639 bp->bp_port_max_age = cu->cu_max_age; 640 bp->bp_port_fdelay = cu->cu_forward_delay; 641 bp->bp_port_htime = 642 (cu->cu_hello_time > BSTP_MIN_HELLO_TIME ? 643 cu->cu_hello_time : BSTP_MIN_HELLO_TIME); 644 645 /* set expiry for the new info */ 646 bstp_set_timer_msgage(bp); 647 648 bp->bp_infois = BSTP_INFO_RECEIVED; 649 bstp_assign_roles(bs); 650 break; 651 652 case BSTP_PDU_REPEATED: 653 if (cu->cu_proposal && cu->cu_forwarding == 0) 654 bp->bp_proposed = 1; 655 if (cu->cu_topology_change) 656 bp->bp_rcvdtc = 1; 657 if (cu->cu_topology_change_ack) 658 bp->bp_rcvdtca = 1; 659 660 /* rearm the age timer */ 661 bstp_set_timer_msgage(bp); 662 break; 663 664 case BSTP_PDU_INFERIOR: 665 if (cu->cu_learning) { 666 bp->bp_agreed = 1; 667 bp->bp_proposing = 0; 668 } 669 break; 670 671 case BSTP_PDU_INFERIORALT: 672 /* 673 * only point to point links are allowed fast 674 * transitions to forwarding. 675 */ 676 if (cu->cu_agree && bp->bp_ptp_link) { 677 bp->bp_agreed = 1; 678 bp->bp_proposing = 0; 679 } else 680 bp->bp_agreed = 0; 681 682 if (cu->cu_topology_change) 683 bp->bp_rcvdtc = 1; 684 if (cu->cu_topology_change_ack) 685 bp->bp_rcvdtca = 1; 686 break; 687 688 case BSTP_PDU_OTHER: 689 return; /* do nothing */ 690 } 691 /* update the state machines with the new data */ 692 bstp_update_state(bs, bp); 693 } 694 695 static int 696 bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu) 697 { 698 int type; 699 700 /* default return type */ 701 type = BSTP_PDU_OTHER; 702 703 switch (cu->cu_role) { 704 case BSTP_ROLE_DESIGNATED: 705 if (bstp_info_superior(&bp->bp_port_pv, &cu->cu_pv)) 706 /* bpdu priority is superior */ 707 type = BSTP_PDU_SUPERIOR; 708 else if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) == 709 INFO_SAME) { 710 if (bp->bp_port_msg_age != cu->cu_message_age || 711 bp->bp_port_max_age != cu->cu_max_age || 712 bp->bp_port_fdelay != cu->cu_forward_delay || 713 bp->bp_port_htime != cu->cu_hello_time) 714 /* bpdu priority is equal and timers differ */ 715 type = BSTP_PDU_SUPERIOR; 716 else 717 /* bpdu is equal */ 718 type = BSTP_PDU_REPEATED; 719 } else 720 /* bpdu priority is worse */ 721 type = BSTP_PDU_INFERIOR; 722 723 break; 724 725 case BSTP_ROLE_ROOT: 726 case BSTP_ROLE_ALTERNATE: 727 case BSTP_ROLE_BACKUP: 728 if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) <= INFO_SAME) 729 /* 730 * not a designated port and priority is the same or 731 * worse 732 */ 733 type = BSTP_PDU_INFERIORALT; 734 break; 735 } 736 737 return (type); 738 } 739 740 static int 741 bstp_pdu_bettersame(struct bstp_port *bp, int newinfo) 742 { 743 if (newinfo == BSTP_INFO_RECEIVED && 744 bp->bp_infois == BSTP_INFO_RECEIVED && 745 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME) 746 return (1); 747 748 if (newinfo == BSTP_INFO_MINE && 749 bp->bp_infois == BSTP_INFO_MINE && 750 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) >= INFO_SAME) 751 return (1); 752 753 return (0); 754 } 755 756 static int 757 bstp_info_cmp(struct bstp_pri_vector *pv, 758 struct bstp_pri_vector *cpv) 759 { 760 if (cpv->pv_root_id < pv->pv_root_id) 761 return (INFO_BETTER); 762 if (cpv->pv_root_id > pv->pv_root_id) 763 return (INFO_WORSE); 764 765 if (cpv->pv_cost < pv->pv_cost) 766 return (INFO_BETTER); 767 if (cpv->pv_cost > pv->pv_cost) 768 return (INFO_WORSE); 769 770 if (cpv->pv_dbridge_id < pv->pv_dbridge_id) 771 return (INFO_BETTER); 772 if (cpv->pv_dbridge_id > pv->pv_dbridge_id) 773 return (INFO_WORSE); 774 775 if (cpv->pv_dport_id < pv->pv_dport_id) 776 return (INFO_BETTER); 777 if (cpv->pv_dport_id > pv->pv_dport_id) 778 return (INFO_WORSE); 779 780 return (INFO_SAME); 781 } 782 783 /* 784 * This message priority vector is superior to the port priority vector and 785 * will replace it if, and only if, the message priority vector is better than 786 * the port priority vector, or the message has been transmitted from the same 787 * designated bridge and designated port as the port priority vector. 788 */ 789 static int 790 bstp_info_superior(struct bstp_pri_vector *pv, 791 struct bstp_pri_vector *cpv) 792 { 793 if (bstp_info_cmp(pv, cpv) == INFO_BETTER || 794 (bstp_same_bridgeid(pv->pv_dbridge_id, cpv->pv_dbridge_id) && 795 (cpv->pv_dport_id & 0xfff) == (pv->pv_dport_id & 0xfff))) 796 return (1); 797 return (0); 798 } 799 800 static void 801 bstp_assign_roles(struct bstp_state *bs) 802 { 803 struct bstp_port *bp, *rbp = NULL; 804 struct bstp_pri_vector pv; 805 806 /* default to our priority vector */ 807 bs->bs_root_pv = bs->bs_bridge_pv; 808 bs->bs_root_msg_age = 0; 809 bs->bs_root_max_age = bs->bs_bridge_max_age; 810 bs->bs_root_fdelay = bs->bs_bridge_fdelay; 811 bs->bs_root_htime = bs->bs_bridge_htime; 812 bs->bs_root_port = NULL; 813 814 /* check if any received info supersedes us */ 815 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 816 if (bp->bp_infois != BSTP_INFO_RECEIVED) 817 continue; 818 819 pv = bp->bp_port_pv; 820 pv.pv_cost += bp->bp_path_cost; 821 822 /* 823 * The root priority vector is the best of the set comprising 824 * the bridge priority vector plus all root path priority 825 * vectors whose bridge address is not equal to us. 826 */ 827 if (bstp_same_bridgeid(pv.pv_dbridge_id, 828 bs->bs_bridge_pv.pv_dbridge_id) == 0 && 829 bstp_info_cmp(&bs->bs_root_pv, &pv) == INFO_BETTER) { 830 /* the port vector replaces the root */ 831 bs->bs_root_pv = pv; 832 bs->bs_root_msg_age = bp->bp_port_msg_age + 833 BSTP_MESSAGE_AGE_INCR; 834 bs->bs_root_max_age = bp->bp_port_max_age; 835 bs->bs_root_fdelay = bp->bp_port_fdelay; 836 bs->bs_root_htime = bp->bp_port_htime; 837 rbp = bp; 838 } 839 } 840 841 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 842 /* calculate the port designated vector */ 843 bp->bp_desg_pv.pv_root_id = bs->bs_root_pv.pv_root_id; 844 bp->bp_desg_pv.pv_cost = bs->bs_root_pv.pv_cost; 845 bp->bp_desg_pv.pv_dbridge_id = bs->bs_bridge_pv.pv_dbridge_id; 846 bp->bp_desg_pv.pv_dport_id = bp->bp_port_id; 847 bp->bp_desg_pv.pv_port_id = bp->bp_port_id; 848 849 /* calculate designated times */ 850 bp->bp_desg_msg_age = bs->bs_root_msg_age; 851 bp->bp_desg_max_age = bs->bs_root_max_age; 852 bp->bp_desg_fdelay = bs->bs_root_fdelay; 853 bp->bp_desg_htime = bs->bs_bridge_htime; 854 855 switch (bp->bp_infois) { 856 case BSTP_INFO_DISABLED: 857 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 858 break; 859 860 case BSTP_INFO_AGED: 861 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 862 bstp_update_info(bp); 863 break; 864 865 case BSTP_INFO_MINE: 866 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 867 /* update the port info if stale */ 868 if (bstp_info_cmp(&bp->bp_port_pv, 869 &bp->bp_desg_pv) != INFO_SAME || 870 (rbp != NULL && 871 (bp->bp_port_msg_age != rbp->bp_port_msg_age || 872 bp->bp_port_max_age != rbp->bp_port_max_age || 873 bp->bp_port_fdelay != rbp->bp_port_fdelay || 874 bp->bp_port_htime != rbp->bp_port_htime))) 875 bstp_update_info(bp); 876 break; 877 878 case BSTP_INFO_RECEIVED: 879 if (bp == rbp) { 880 /* 881 * root priority is derived from this 882 * port, make it the root port. 883 */ 884 bstp_set_port_role(bp, BSTP_ROLE_ROOT); 885 bs->bs_root_port = bp; 886 } else if (bstp_info_cmp(&bp->bp_port_pv, 887 &bp->bp_desg_pv) == INFO_BETTER) { 888 /* 889 * the port priority is lower than the root 890 * port. 891 */ 892 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 893 bstp_update_info(bp); 894 } else { 895 if (bstp_same_bridgeid( 896 bp->bp_port_pv.pv_dbridge_id, 897 bs->bs_bridge_pv.pv_dbridge_id)) { 898 /* 899 * the designated bridge refers to 900 * another port on this bridge. 901 */ 902 bstp_set_port_role(bp, 903 BSTP_ROLE_BACKUP); 904 } else { 905 /* 906 * the port is an inferior path to the 907 * root bridge. 908 */ 909 bstp_set_port_role(bp, 910 BSTP_ROLE_ALTERNATE); 911 } 912 } 913 break; 914 } 915 } 916 } 917 918 static void 919 bstp_update_state(struct bstp_state *bs, struct bstp_port *bp) 920 { 921 struct bstp_port *bp2; 922 int synced; 923 924 BSTP_LOCK_ASSERT(bs); 925 926 /* check if all the ports have syncronised again */ 927 if (!bs->bs_allsynced) { 928 synced = 1; 929 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 930 if (!(bp2->bp_synced || 931 bp2->bp_role == BSTP_ROLE_ROOT)) { 932 synced = 0; 933 break; 934 } 935 } 936 bs->bs_allsynced = synced; 937 } 938 939 bstp_update_roles(bs, bp); 940 bstp_update_tc(bp); 941 } 942 943 static void 944 bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp) 945 { 946 NET_EPOCH_ASSERT(); 947 948 switch (bp->bp_role) { 949 case BSTP_ROLE_DISABLED: 950 /* Clear any flags if set */ 951 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 952 bp->bp_sync = 0; 953 bp->bp_synced = 1; 954 bp->bp_reroot = 0; 955 } 956 break; 957 958 case BSTP_ROLE_ALTERNATE: 959 case BSTP_ROLE_BACKUP: 960 if ((bs->bs_allsynced && !bp->bp_agree) || 961 (bp->bp_proposed && bp->bp_agree)) { 962 bp->bp_proposed = 0; 963 bp->bp_agree = 1; 964 bp->bp_flags |= BSTP_PORT_NEWINFO; 965 DPRINTF("%s -> ALTERNATE_AGREED\n", 966 bp->bp_ifp->if_xname); 967 } 968 969 if (bp->bp_proposed && !bp->bp_agree) { 970 bstp_set_all_sync(bs); 971 bp->bp_proposed = 0; 972 DPRINTF("%s -> ALTERNATE_PROPOSED\n", 973 bp->bp_ifp->if_xname); 974 } 975 976 /* Clear any flags if set */ 977 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 978 bp->bp_sync = 0; 979 bp->bp_synced = 1; 980 bp->bp_reroot = 0; 981 DPRINTF("%s -> ALTERNATE_PORT\n", bp->bp_ifp->if_xname); 982 } 983 break; 984 985 case BSTP_ROLE_ROOT: 986 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) { 987 bstp_set_all_reroot(bs); 988 DPRINTF("%s -> ROOT_REROOT\n", bp->bp_ifp->if_xname); 989 } 990 991 if ((bs->bs_allsynced && !bp->bp_agree) || 992 (bp->bp_proposed && bp->bp_agree)) { 993 bp->bp_proposed = 0; 994 bp->bp_sync = 0; 995 bp->bp_agree = 1; 996 bp->bp_flags |= BSTP_PORT_NEWINFO; 997 DPRINTF("%s -> ROOT_AGREED\n", bp->bp_ifp->if_xname); 998 } 999 1000 if (bp->bp_proposed && !bp->bp_agree) { 1001 bstp_set_all_sync(bs); 1002 bp->bp_proposed = 0; 1003 DPRINTF("%s -> ROOT_PROPOSED\n", bp->bp_ifp->if_xname); 1004 } 1005 1006 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1007 (bp->bp_forward_delay_timer.active == 0 || 1008 (bstp_rerooted(bs, bp) && 1009 bp->bp_recent_backup_timer.active == 0 && 1010 bp->bp_protover == BSTP_PROTO_RSTP))) { 1011 switch (bp->bp_state) { 1012 case BSTP_IFSTATE_DISCARDING: 1013 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 1014 break; 1015 case BSTP_IFSTATE_LEARNING: 1016 bstp_set_port_state(bp, 1017 BSTP_IFSTATE_FORWARDING); 1018 break; 1019 } 1020 } 1021 1022 if (bp->bp_state == BSTP_IFSTATE_FORWARDING && bp->bp_reroot) { 1023 bp->bp_reroot = 0; 1024 DPRINTF("%s -> ROOT_REROOTED\n", bp->bp_ifp->if_xname); 1025 } 1026 break; 1027 1028 case BSTP_ROLE_DESIGNATED: 1029 if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) { 1030 bp->bp_reroot = 0; 1031 DPRINTF("%s -> DESIGNATED_RETIRED\n", 1032 bp->bp_ifp->if_xname); 1033 } 1034 1035 if ((bp->bp_state == BSTP_IFSTATE_DISCARDING && 1036 !bp->bp_synced) || (bp->bp_agreed && !bp->bp_synced) || 1037 (bp->bp_operedge && !bp->bp_synced) || 1038 (bp->bp_sync && bp->bp_synced)) { 1039 bstp_timer_stop(&bp->bp_recent_root_timer); 1040 bp->bp_synced = 1; 1041 bp->bp_sync = 0; 1042 DPRINTF("%s -> DESIGNATED_SYNCED\n", 1043 bp->bp_ifp->if_xname); 1044 } 1045 1046 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1047 !bp->bp_agreed && !bp->bp_proposing && 1048 !bp->bp_operedge) { 1049 bp->bp_proposing = 1; 1050 bp->bp_flags |= BSTP_PORT_NEWINFO; 1051 bstp_timer_start(&bp->bp_edge_delay_timer, 1052 (bp->bp_ptp_link ? BSTP_DEFAULT_MIGRATE_DELAY : 1053 bp->bp_desg_max_age)); 1054 DPRINTF("%s -> DESIGNATED_PROPOSE\n", 1055 bp->bp_ifp->if_xname); 1056 } 1057 1058 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1059 (bp->bp_forward_delay_timer.active == 0 || bp->bp_agreed || 1060 bp->bp_operedge) && 1061 (bp->bp_recent_root_timer.active == 0 || !bp->bp_reroot) && 1062 !bp->bp_sync) { 1063 if (bp->bp_agreed) 1064 DPRINTF("%s -> AGREED\n", bp->bp_ifp->if_xname); 1065 /* 1066 * If agreed|operedge then go straight to forwarding, 1067 * otherwise follow discard -> learn -> forward. 1068 */ 1069 if (bp->bp_agreed || bp->bp_operedge || 1070 bp->bp_state == BSTP_IFSTATE_LEARNING) { 1071 bstp_set_port_state(bp, 1072 BSTP_IFSTATE_FORWARDING); 1073 bp->bp_agreed = bp->bp_protover; 1074 } else if (bp->bp_state == BSTP_IFSTATE_DISCARDING) 1075 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 1076 } 1077 1078 if (((bp->bp_sync && !bp->bp_synced) || 1079 (bp->bp_reroot && bp->bp_recent_root_timer.active) || 1080 (bp->bp_flags & BSTP_PORT_DISPUTED)) && !bp->bp_operedge && 1081 bp->bp_state != BSTP_IFSTATE_DISCARDING) { 1082 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1083 bp->bp_flags &= ~BSTP_PORT_DISPUTED; 1084 bstp_timer_start(&bp->bp_forward_delay_timer, 1085 bp->bp_protover == BSTP_PROTO_RSTP ? 1086 bp->bp_desg_htime : bp->bp_desg_fdelay); 1087 DPRINTF("%s -> DESIGNATED_DISCARD\n", 1088 bp->bp_ifp->if_xname); 1089 } 1090 break; 1091 } 1092 1093 if (bp->bp_flags & BSTP_PORT_NEWINFO) 1094 bstp_transmit(bs, bp); 1095 } 1096 1097 static void 1098 bstp_update_tc(struct bstp_port *bp) 1099 { 1100 switch (bp->bp_tcstate) { 1101 case BSTP_TCSTATE_ACTIVE: 1102 if ((bp->bp_role != BSTP_ROLE_DESIGNATED && 1103 bp->bp_role != BSTP_ROLE_ROOT) || bp->bp_operedge) 1104 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1105 1106 if (bp->bp_rcvdtcn) 1107 bstp_set_port_tc(bp, BSTP_TCSTATE_TCN); 1108 if (bp->bp_rcvdtc) 1109 bstp_set_port_tc(bp, BSTP_TCSTATE_TC); 1110 1111 if (bp->bp_tc_prop && !bp->bp_operedge) 1112 bstp_set_port_tc(bp, BSTP_TCSTATE_PROPAG); 1113 1114 if (bp->bp_rcvdtca) 1115 bstp_set_port_tc(bp, BSTP_TCSTATE_ACK); 1116 break; 1117 1118 case BSTP_TCSTATE_INACTIVE: 1119 if ((bp->bp_state == BSTP_IFSTATE_LEARNING || 1120 bp->bp_state == BSTP_IFSTATE_FORWARDING) && 1121 bp->bp_fdbflush == 0) 1122 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1123 break; 1124 1125 case BSTP_TCSTATE_LEARNING: 1126 if (bp->bp_rcvdtc || bp->bp_rcvdtcn || bp->bp_rcvdtca || 1127 bp->bp_tc_prop) 1128 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1129 else if (bp->bp_role != BSTP_ROLE_DESIGNATED && 1130 bp->bp_role != BSTP_ROLE_ROOT && 1131 bp->bp_state == BSTP_IFSTATE_DISCARDING) 1132 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1133 1134 if ((bp->bp_role == BSTP_ROLE_DESIGNATED || 1135 bp->bp_role == BSTP_ROLE_ROOT) && 1136 bp->bp_state == BSTP_IFSTATE_FORWARDING && 1137 !bp->bp_operedge) 1138 bstp_set_port_tc(bp, BSTP_TCSTATE_DETECTED); 1139 break; 1140 1141 /* these are transient states and go straight back to ACTIVE */ 1142 case BSTP_TCSTATE_DETECTED: 1143 case BSTP_TCSTATE_TCN: 1144 case BSTP_TCSTATE_TC: 1145 case BSTP_TCSTATE_PROPAG: 1146 case BSTP_TCSTATE_ACK: 1147 DPRINTF("Invalid TC state for %s\n", 1148 bp->bp_ifp->if_xname); 1149 break; 1150 } 1151 1152 } 1153 1154 static void 1155 bstp_update_info(struct bstp_port *bp) 1156 { 1157 struct bstp_state *bs = bp->bp_bs; 1158 1159 bp->bp_proposing = 0; 1160 bp->bp_proposed = 0; 1161 1162 if (bp->bp_agreed && !bstp_pdu_bettersame(bp, BSTP_INFO_MINE)) 1163 bp->bp_agreed = 0; 1164 1165 if (bp->bp_synced && !bp->bp_agreed) { 1166 bp->bp_synced = 0; 1167 bs->bs_allsynced = 0; 1168 } 1169 1170 /* copy the designated pv to the port */ 1171 bp->bp_port_pv = bp->bp_desg_pv; 1172 bp->bp_port_msg_age = bp->bp_desg_msg_age; 1173 bp->bp_port_max_age = bp->bp_desg_max_age; 1174 bp->bp_port_fdelay = bp->bp_desg_fdelay; 1175 bp->bp_port_htime = bp->bp_desg_htime; 1176 bp->bp_infois = BSTP_INFO_MINE; 1177 1178 /* Set transmit flag but do not immediately send */ 1179 bp->bp_flags |= BSTP_PORT_NEWINFO; 1180 } 1181 1182 /* set tcprop on every port other than the caller */ 1183 static void 1184 bstp_set_other_tcprop(struct bstp_port *bp) 1185 { 1186 struct bstp_state *bs = bp->bp_bs; 1187 struct bstp_port *bp2; 1188 1189 BSTP_LOCK_ASSERT(bs); 1190 1191 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1192 if (bp2 == bp) 1193 continue; 1194 bp2->bp_tc_prop = 1; 1195 } 1196 } 1197 1198 static void 1199 bstp_set_all_reroot(struct bstp_state *bs) 1200 { 1201 struct bstp_port *bp; 1202 1203 BSTP_LOCK_ASSERT(bs); 1204 1205 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1206 bp->bp_reroot = 1; 1207 } 1208 1209 static void 1210 bstp_set_all_sync(struct bstp_state *bs) 1211 { 1212 struct bstp_port *bp; 1213 1214 BSTP_LOCK_ASSERT(bs); 1215 1216 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1217 bp->bp_sync = 1; 1218 bp->bp_synced = 0; /* Not explicit in spec */ 1219 } 1220 1221 bs->bs_allsynced = 0; 1222 } 1223 1224 static void 1225 bstp_set_port_state(struct bstp_port *bp, int state) 1226 { 1227 if (bp->bp_state == state) 1228 return; 1229 1230 bp->bp_state = state; 1231 1232 switch (bp->bp_state) { 1233 case BSTP_IFSTATE_DISCARDING: 1234 DPRINTF("state changed to DISCARDING on %s\n", 1235 bp->bp_ifp->if_xname); 1236 break; 1237 1238 case BSTP_IFSTATE_LEARNING: 1239 DPRINTF("state changed to LEARNING on %s\n", 1240 bp->bp_ifp->if_xname); 1241 1242 bstp_timer_start(&bp->bp_forward_delay_timer, 1243 bp->bp_protover == BSTP_PROTO_RSTP ? 1244 bp->bp_desg_htime : bp->bp_desg_fdelay); 1245 break; 1246 1247 case BSTP_IFSTATE_FORWARDING: 1248 DPRINTF("state changed to FORWARDING on %s\n", 1249 bp->bp_ifp->if_xname); 1250 1251 bstp_timer_stop(&bp->bp_forward_delay_timer); 1252 /* Record that we enabled forwarding */ 1253 bp->bp_forward_transitions++; 1254 break; 1255 } 1256 1257 /* notify the parent bridge */ 1258 taskqueue_enqueue(taskqueue_swi, &bp->bp_statetask); 1259 } 1260 1261 static void 1262 bstp_set_port_role(struct bstp_port *bp, int role) 1263 { 1264 struct bstp_state *bs = bp->bp_bs; 1265 1266 if (bp->bp_role == role) 1267 return; 1268 1269 /* perform pre-change tasks */ 1270 switch (bp->bp_role) { 1271 case BSTP_ROLE_DISABLED: 1272 bstp_timer_start(&bp->bp_forward_delay_timer, 1273 bp->bp_desg_max_age); 1274 break; 1275 1276 case BSTP_ROLE_BACKUP: 1277 bstp_timer_start(&bp->bp_recent_backup_timer, 1278 bp->bp_desg_htime * 2); 1279 /* fall through */ 1280 case BSTP_ROLE_ALTERNATE: 1281 bstp_timer_start(&bp->bp_forward_delay_timer, 1282 bp->bp_desg_fdelay); 1283 bp->bp_sync = 0; 1284 bp->bp_synced = 1; 1285 bp->bp_reroot = 0; 1286 break; 1287 1288 case BSTP_ROLE_ROOT: 1289 bstp_timer_start(&bp->bp_recent_root_timer, 1290 BSTP_DEFAULT_FORWARD_DELAY); 1291 break; 1292 } 1293 1294 bp->bp_role = role; 1295 /* clear values not carried between roles */ 1296 bp->bp_proposing = 0; 1297 bs->bs_allsynced = 0; 1298 1299 /* initialise the new role */ 1300 switch (bp->bp_role) { 1301 case BSTP_ROLE_DISABLED: 1302 case BSTP_ROLE_ALTERNATE: 1303 case BSTP_ROLE_BACKUP: 1304 DPRINTF("%s role -> ALT/BACK/DISABLED\n", 1305 bp->bp_ifp->if_xname); 1306 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1307 bstp_timer_stop(&bp->bp_recent_root_timer); 1308 bstp_timer_latch(&bp->bp_forward_delay_timer); 1309 bp->bp_sync = 0; 1310 bp->bp_synced = 1; 1311 bp->bp_reroot = 0; 1312 break; 1313 1314 case BSTP_ROLE_ROOT: 1315 DPRINTF("%s role -> ROOT\n", 1316 bp->bp_ifp->if_xname); 1317 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1318 bstp_timer_latch(&bp->bp_recent_root_timer); 1319 bp->bp_proposing = 0; 1320 break; 1321 1322 case BSTP_ROLE_DESIGNATED: 1323 DPRINTF("%s role -> DESIGNATED\n", 1324 bp->bp_ifp->if_xname); 1325 bstp_timer_start(&bp->bp_hello_timer, 1326 bp->bp_desg_htime); 1327 bp->bp_agree = 0; 1328 break; 1329 } 1330 1331 /* let the TC state know that the role changed */ 1332 bstp_update_tc(bp); 1333 } 1334 1335 static void 1336 bstp_set_port_proto(struct bstp_port *bp, int proto) 1337 { 1338 struct bstp_state *bs = bp->bp_bs; 1339 1340 /* supported protocol versions */ 1341 switch (proto) { 1342 case BSTP_PROTO_STP: 1343 /* we can downgrade protocols only */ 1344 bstp_timer_stop(&bp->bp_migrate_delay_timer); 1345 /* clear unsupported features */ 1346 bp->bp_operedge = 0; 1347 /* STP compat mode only uses 16 bits of the 32 */ 1348 if (bp->bp_path_cost > 65535) 1349 bp->bp_path_cost = 65535; 1350 break; 1351 1352 case BSTP_PROTO_RSTP: 1353 bstp_timer_start(&bp->bp_migrate_delay_timer, 1354 bs->bs_migration_delay); 1355 break; 1356 1357 default: 1358 DPRINTF("Unsupported STP version %d\n", proto); 1359 return; 1360 } 1361 1362 bp->bp_protover = proto; 1363 bp->bp_flags &= ~BSTP_PORT_CANMIGRATE; 1364 } 1365 1366 static void 1367 bstp_set_port_tc(struct bstp_port *bp, int state) 1368 { 1369 struct bstp_state *bs = bp->bp_bs; 1370 1371 bp->bp_tcstate = state; 1372 1373 /* initialise the new state */ 1374 switch (bp->bp_tcstate) { 1375 case BSTP_TCSTATE_ACTIVE: 1376 DPRINTF("%s -> TC_ACTIVE\n", bp->bp_ifp->if_xname); 1377 /* nothing to do */ 1378 break; 1379 1380 case BSTP_TCSTATE_INACTIVE: 1381 bstp_timer_stop(&bp->bp_tc_timer); 1382 /* flush routes on the parent bridge */ 1383 bp->bp_fdbflush = 1; 1384 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask); 1385 bp->bp_tc_ack = 0; 1386 DPRINTF("%s -> TC_INACTIVE\n", bp->bp_ifp->if_xname); 1387 break; 1388 1389 case BSTP_TCSTATE_LEARNING: 1390 bp->bp_rcvdtc = 0; 1391 bp->bp_rcvdtcn = 0; 1392 bp->bp_rcvdtca = 0; 1393 bp->bp_tc_prop = 0; 1394 DPRINTF("%s -> TC_LEARNING\n", bp->bp_ifp->if_xname); 1395 break; 1396 1397 case BSTP_TCSTATE_DETECTED: 1398 bstp_set_timer_tc(bp); 1399 bstp_set_other_tcprop(bp); 1400 /* send out notification */ 1401 bp->bp_flags |= BSTP_PORT_NEWINFO; 1402 bstp_transmit(bs, bp); 1403 getmicrotime(&bs->bs_last_tc_time); 1404 DPRINTF("%s -> TC_DETECTED\n", bp->bp_ifp->if_xname); 1405 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1406 break; 1407 1408 case BSTP_TCSTATE_TCN: 1409 bstp_set_timer_tc(bp); 1410 DPRINTF("%s -> TC_TCN\n", bp->bp_ifp->if_xname); 1411 /* fall through */ 1412 case BSTP_TCSTATE_TC: 1413 bp->bp_rcvdtc = 0; 1414 bp->bp_rcvdtcn = 0; 1415 if (bp->bp_role == BSTP_ROLE_DESIGNATED) 1416 bp->bp_tc_ack = 1; 1417 1418 bstp_set_other_tcprop(bp); 1419 DPRINTF("%s -> TC_TC\n", bp->bp_ifp->if_xname); 1420 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1421 break; 1422 1423 case BSTP_TCSTATE_PROPAG: 1424 /* flush routes on the parent bridge */ 1425 bp->bp_fdbflush = 1; 1426 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask); 1427 bp->bp_tc_prop = 0; 1428 bstp_set_timer_tc(bp); 1429 DPRINTF("%s -> TC_PROPAG\n", bp->bp_ifp->if_xname); 1430 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1431 break; 1432 1433 case BSTP_TCSTATE_ACK: 1434 bstp_timer_stop(&bp->bp_tc_timer); 1435 bp->bp_rcvdtca = 0; 1436 DPRINTF("%s -> TC_ACK\n", bp->bp_ifp->if_xname); 1437 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1438 break; 1439 } 1440 } 1441 1442 static void 1443 bstp_set_timer_tc(struct bstp_port *bp) 1444 { 1445 struct bstp_state *bs = bp->bp_bs; 1446 1447 if (bp->bp_tc_timer.active) 1448 return; 1449 1450 switch (bp->bp_protover) { 1451 case BSTP_PROTO_RSTP: 1452 bstp_timer_start(&bp->bp_tc_timer, 1453 bp->bp_desg_htime + BSTP_TICK_VAL); 1454 bp->bp_flags |= BSTP_PORT_NEWINFO; 1455 break; 1456 1457 case BSTP_PROTO_STP: 1458 bstp_timer_start(&bp->bp_tc_timer, 1459 bs->bs_root_max_age + bs->bs_root_fdelay); 1460 break; 1461 } 1462 } 1463 1464 static void 1465 bstp_set_timer_msgage(struct bstp_port *bp) 1466 { 1467 if (bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR <= 1468 bp->bp_port_max_age) { 1469 bstp_timer_start(&bp->bp_message_age_timer, 1470 bp->bp_port_htime * 3); 1471 } else 1472 /* expires immediately */ 1473 bstp_timer_start(&bp->bp_message_age_timer, 0); 1474 } 1475 1476 static int 1477 bstp_rerooted(struct bstp_state *bs, struct bstp_port *bp) 1478 { 1479 struct bstp_port *bp2; 1480 int rr_set = 0; 1481 1482 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1483 if (bp2 == bp) 1484 continue; 1485 if (bp2->bp_recent_root_timer.active) { 1486 rr_set = 1; 1487 break; 1488 } 1489 } 1490 return (!rr_set); 1491 } 1492 1493 int 1494 bstp_set_htime(struct bstp_state *bs, int t) 1495 { 1496 /* convert seconds to ticks */ 1497 t *= BSTP_TICK_VAL; 1498 1499 /* value can only be changed in leagacy stp mode */ 1500 if (bs->bs_protover != BSTP_PROTO_STP) 1501 return (EPERM); 1502 1503 if (t < BSTP_MIN_HELLO_TIME || t > BSTP_MAX_HELLO_TIME) 1504 return (EINVAL); 1505 1506 BSTP_LOCK(bs); 1507 bs->bs_bridge_htime = t; 1508 bstp_reinit(bs); 1509 BSTP_UNLOCK(bs); 1510 return (0); 1511 } 1512 1513 int 1514 bstp_set_fdelay(struct bstp_state *bs, int t) 1515 { 1516 /* convert seconds to ticks */ 1517 t *= BSTP_TICK_VAL; 1518 1519 if (t < BSTP_MIN_FORWARD_DELAY || t > BSTP_MAX_FORWARD_DELAY) 1520 return (EINVAL); 1521 1522 BSTP_LOCK(bs); 1523 bs->bs_bridge_fdelay = t; 1524 bstp_reinit(bs); 1525 BSTP_UNLOCK(bs); 1526 return (0); 1527 } 1528 1529 int 1530 bstp_set_maxage(struct bstp_state *bs, int t) 1531 { 1532 /* convert seconds to ticks */ 1533 t *= BSTP_TICK_VAL; 1534 1535 if (t < BSTP_MIN_MAX_AGE || t > BSTP_MAX_MAX_AGE) 1536 return (EINVAL); 1537 1538 BSTP_LOCK(bs); 1539 bs->bs_bridge_max_age = t; 1540 bstp_reinit(bs); 1541 BSTP_UNLOCK(bs); 1542 return (0); 1543 } 1544 1545 int 1546 bstp_set_holdcount(struct bstp_state *bs, int count) 1547 { 1548 struct bstp_port *bp; 1549 1550 if (count < BSTP_MIN_HOLD_COUNT || 1551 count > BSTP_MAX_HOLD_COUNT) 1552 return (EINVAL); 1553 1554 BSTP_LOCK(bs); 1555 bs->bs_txholdcount = count; 1556 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1557 bp->bp_txcount = 0; 1558 BSTP_UNLOCK(bs); 1559 return (0); 1560 } 1561 1562 int 1563 bstp_set_protocol(struct bstp_state *bs, int proto) 1564 { 1565 struct bstp_port *bp; 1566 1567 switch (proto) { 1568 /* Supported protocol versions */ 1569 case BSTP_PROTO_STP: 1570 case BSTP_PROTO_RSTP: 1571 break; 1572 1573 default: 1574 return (EINVAL); 1575 } 1576 1577 BSTP_LOCK(bs); 1578 bs->bs_protover = proto; 1579 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 1580 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1581 /* reinit state */ 1582 bp->bp_infois = BSTP_INFO_DISABLED; 1583 bp->bp_txcount = 0; 1584 bstp_set_port_proto(bp, bs->bs_protover); 1585 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 1586 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1587 bstp_timer_stop(&bp->bp_recent_backup_timer); 1588 } 1589 bstp_reinit(bs); 1590 BSTP_UNLOCK(bs); 1591 return (0); 1592 } 1593 1594 int 1595 bstp_set_priority(struct bstp_state *bs, int pri) 1596 { 1597 if (pri < 0 || pri > BSTP_MAX_PRIORITY) 1598 return (EINVAL); 1599 1600 /* Limit to steps of 4096 */ 1601 pri -= pri % 4096; 1602 1603 BSTP_LOCK(bs); 1604 bs->bs_bridge_priority = pri; 1605 bstp_reinit(bs); 1606 BSTP_UNLOCK(bs); 1607 return (0); 1608 } 1609 1610 int 1611 bstp_set_port_priority(struct bstp_port *bp, int pri) 1612 { 1613 struct bstp_state *bs = bp->bp_bs; 1614 1615 if (pri < 0 || pri > BSTP_MAX_PORT_PRIORITY) 1616 return (EINVAL); 1617 1618 /* Limit to steps of 16 */ 1619 pri -= pri % 16; 1620 1621 BSTP_LOCK(bs); 1622 bp->bp_priority = pri; 1623 bstp_reinit(bs); 1624 BSTP_UNLOCK(bs); 1625 return (0); 1626 } 1627 1628 int 1629 bstp_set_path_cost(struct bstp_port *bp, uint32_t path_cost) 1630 { 1631 struct bstp_state *bs = bp->bp_bs; 1632 1633 if (path_cost > BSTP_MAX_PATH_COST) 1634 return (EINVAL); 1635 1636 /* STP compat mode only uses 16 bits of the 32 */ 1637 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1638 path_cost = 65535; 1639 1640 BSTP_LOCK(bs); 1641 1642 if (path_cost == 0) { /* use auto */ 1643 bp->bp_flags &= ~BSTP_PORT_ADMCOST; 1644 bp->bp_path_cost = bstp_calc_path_cost(bp); 1645 } else { 1646 bp->bp_path_cost = path_cost; 1647 bp->bp_flags |= BSTP_PORT_ADMCOST; 1648 } 1649 bstp_reinit(bs); 1650 BSTP_UNLOCK(bs); 1651 return (0); 1652 } 1653 1654 int 1655 bstp_set_edge(struct bstp_port *bp, int set) 1656 { 1657 struct bstp_state *bs = bp->bp_bs; 1658 1659 BSTP_LOCK(bs); 1660 if ((bp->bp_operedge = set) == 0) 1661 bp->bp_flags &= ~BSTP_PORT_ADMEDGE; 1662 else 1663 bp->bp_flags |= BSTP_PORT_ADMEDGE; 1664 BSTP_UNLOCK(bs); 1665 return (0); 1666 } 1667 1668 int 1669 bstp_set_autoedge(struct bstp_port *bp, int set) 1670 { 1671 struct bstp_state *bs = bp->bp_bs; 1672 1673 BSTP_LOCK(bs); 1674 if (set) { 1675 bp->bp_flags |= BSTP_PORT_AUTOEDGE; 1676 /* we may be able to transition straight to edge */ 1677 if (bp->bp_edge_delay_timer.active == 0) 1678 bstp_edge_delay_expiry(bs, bp); 1679 } else 1680 bp->bp_flags &= ~BSTP_PORT_AUTOEDGE; 1681 BSTP_UNLOCK(bs); 1682 return (0); 1683 } 1684 1685 int 1686 bstp_set_ptp(struct bstp_port *bp, int set) 1687 { 1688 struct bstp_state *bs = bp->bp_bs; 1689 1690 BSTP_LOCK(bs); 1691 bp->bp_ptp_link = set; 1692 BSTP_UNLOCK(bs); 1693 return (0); 1694 } 1695 1696 int 1697 bstp_set_autoptp(struct bstp_port *bp, int set) 1698 { 1699 struct bstp_state *bs = bp->bp_bs; 1700 1701 BSTP_LOCK(bs); 1702 if (set) { 1703 bp->bp_flags |= BSTP_PORT_AUTOPTP; 1704 if (bp->bp_role != BSTP_ROLE_DISABLED) 1705 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 1706 } else 1707 bp->bp_flags &= ~BSTP_PORT_AUTOPTP; 1708 BSTP_UNLOCK(bs); 1709 return (0); 1710 } 1711 1712 /* 1713 * Calculate the path cost according to the link speed. 1714 */ 1715 static uint32_t 1716 bstp_calc_path_cost(struct bstp_port *bp) 1717 { 1718 struct ifnet *ifp = bp->bp_ifp; 1719 uint32_t path_cost; 1720 1721 /* If the priority has been manually set then retain the value */ 1722 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1723 return bp->bp_path_cost; 1724 1725 if (ifp->if_link_state == LINK_STATE_DOWN) { 1726 /* Recalc when the link comes up again */ 1727 bp->bp_flags |= BSTP_PORT_PNDCOST; 1728 return (BSTP_DEFAULT_PATH_COST); 1729 } 1730 1731 if (ifp->if_baudrate < 1000) 1732 return (BSTP_DEFAULT_PATH_COST); 1733 1734 /* formula from section 17.14, IEEE Std 802.1D-2004 */ 1735 path_cost = 20000000000ULL / (ifp->if_baudrate / 1000); 1736 1737 if (path_cost > BSTP_MAX_PATH_COST) 1738 path_cost = BSTP_MAX_PATH_COST; 1739 1740 /* STP compat mode only uses 16 bits of the 32 */ 1741 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1742 path_cost = 65535; 1743 1744 return (path_cost); 1745 } 1746 1747 /* 1748 * Notify the bridge that a port state has changed, we need to do this from a 1749 * taskqueue to avoid a LOR. 1750 */ 1751 static void 1752 bstp_notify_state(void *arg, int pending) 1753 { 1754 struct bstp_port *bp = (struct bstp_port *)arg; 1755 struct bstp_state *bs = bp->bp_bs; 1756 1757 if (bp->bp_active == 1 && bs->bs_state_cb != NULL) 1758 (*bs->bs_state_cb)(bp->bp_ifp, bp->bp_state); 1759 } 1760 1761 /* 1762 * Flush the routes on the bridge port, we need to do this from a 1763 * taskqueue to avoid a LOR. 1764 */ 1765 static void 1766 bstp_notify_rtage(void *arg, int pending) 1767 { 1768 struct bstp_port *bp = (struct bstp_port *)arg; 1769 struct bstp_state *bs = bp->bp_bs; 1770 int age = 0; 1771 1772 BSTP_LOCK(bs); 1773 switch (bp->bp_protover) { 1774 case BSTP_PROTO_STP: 1775 /* convert to seconds */ 1776 age = bp->bp_desg_fdelay / BSTP_TICK_VAL; 1777 break; 1778 1779 case BSTP_PROTO_RSTP: 1780 age = 0; 1781 break; 1782 } 1783 BSTP_UNLOCK(bs); 1784 1785 if (bp->bp_active == 1 && bs->bs_rtage_cb != NULL) 1786 (*bs->bs_rtage_cb)(bp->bp_ifp, age); 1787 1788 /* flush is complete */ 1789 BSTP_LOCK(bs); 1790 bp->bp_fdbflush = 0; 1791 BSTP_UNLOCK(bs); 1792 } 1793 1794 void 1795 bstp_linkstate(struct bstp_port *bp) 1796 { 1797 struct bstp_state *bs = bp->bp_bs; 1798 1799 if (!bp->bp_active) 1800 return; 1801 1802 bstp_ifupdstatus(bp, 0); 1803 BSTP_LOCK(bs); 1804 bstp_update_state(bs, bp); 1805 BSTP_UNLOCK(bs); 1806 } 1807 1808 static void 1809 bstp_ifupdstatus(void *arg, int pending) 1810 { 1811 struct bstp_port *bp = (struct bstp_port *)arg; 1812 struct bstp_state *bs = bp->bp_bs; 1813 struct ifnet *ifp = bp->bp_ifp; 1814 struct ifmediareq ifmr; 1815 int error, changed; 1816 1817 if (!bp->bp_active) 1818 return; 1819 1820 bzero((char *)&ifmr, sizeof(ifmr)); 1821 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr); 1822 1823 BSTP_LOCK(bs); 1824 changed = 0; 1825 if ((error == 0) && (ifp->if_flags & IFF_UP)) { 1826 if (ifmr.ifm_status & IFM_ACTIVE) { 1827 /* A full-duplex link is assumed to be point to point */ 1828 if (bp->bp_flags & BSTP_PORT_AUTOPTP) { 1829 int fdx; 1830 1831 fdx = ifmr.ifm_active & IFM_FDX ? 1 : 0; 1832 if (bp->bp_ptp_link ^ fdx) { 1833 bp->bp_ptp_link = fdx; 1834 changed = 1; 1835 } 1836 } 1837 1838 /* Calc the cost if the link was down previously */ 1839 if (bp->bp_flags & BSTP_PORT_PNDCOST) { 1840 uint32_t cost; 1841 1842 cost = bstp_calc_path_cost(bp); 1843 if (bp->bp_path_cost != cost) { 1844 bp->bp_path_cost = cost; 1845 changed = 1; 1846 } 1847 bp->bp_flags &= ~BSTP_PORT_PNDCOST; 1848 } 1849 1850 if (bp->bp_role == BSTP_ROLE_DISABLED) { 1851 bstp_enable_port(bs, bp); 1852 changed = 1; 1853 } 1854 } else { 1855 if (bp->bp_role != BSTP_ROLE_DISABLED) { 1856 bstp_disable_port(bs, bp); 1857 changed = 1; 1858 if ((bp->bp_flags & BSTP_PORT_ADMEDGE) && 1859 bp->bp_protover == BSTP_PROTO_RSTP) 1860 bp->bp_operedge = 1; 1861 } 1862 } 1863 } else if (bp->bp_infois != BSTP_INFO_DISABLED) { 1864 bstp_disable_port(bs, bp); 1865 changed = 1; 1866 } 1867 if (changed) 1868 bstp_assign_roles(bs); 1869 BSTP_UNLOCK(bs); 1870 } 1871 1872 static void 1873 bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp) 1874 { 1875 bp->bp_infois = BSTP_INFO_AGED; 1876 } 1877 1878 static void 1879 bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp) 1880 { 1881 bp->bp_infois = BSTP_INFO_DISABLED; 1882 } 1883 1884 static void 1885 bstp_tick(void *arg) 1886 { 1887 struct epoch_tracker et; 1888 struct bstp_state *bs = arg; 1889 struct bstp_port *bp; 1890 1891 BSTP_LOCK_ASSERT(bs); 1892 1893 if (bs->bs_running == 0) 1894 return; 1895 1896 NET_EPOCH_ENTER(et); 1897 CURVNET_SET(bs->bs_vnet); 1898 1899 /* poll link events on interfaces that do not support linkstate */ 1900 if (bstp_timer_dectest(&bs->bs_link_timer)) { 1901 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1902 if (!(bp->bp_ifp->if_capabilities & IFCAP_LINKSTATE)) 1903 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 1904 } 1905 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 1906 } 1907 1908 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1909 /* no events need to happen for these */ 1910 bstp_timer_dectest(&bp->bp_tc_timer); 1911 bstp_timer_dectest(&bp->bp_recent_root_timer); 1912 bstp_timer_dectest(&bp->bp_forward_delay_timer); 1913 bstp_timer_dectest(&bp->bp_recent_backup_timer); 1914 1915 if (bstp_timer_dectest(&bp->bp_hello_timer)) 1916 bstp_hello_timer_expiry(bs, bp); 1917 1918 if (bstp_timer_dectest(&bp->bp_message_age_timer)) 1919 bstp_message_age_expiry(bs, bp); 1920 1921 if (bstp_timer_dectest(&bp->bp_migrate_delay_timer)) 1922 bstp_migrate_delay_expiry(bs, bp); 1923 1924 if (bstp_timer_dectest(&bp->bp_edge_delay_timer)) 1925 bstp_edge_delay_expiry(bs, bp); 1926 1927 /* update the various state machines for the port */ 1928 bstp_update_state(bs, bp); 1929 1930 if (bp->bp_txcount > 0) 1931 bp->bp_txcount--; 1932 } 1933 1934 CURVNET_RESTORE(); 1935 NET_EPOCH_EXIT(et); 1936 1937 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 1938 } 1939 1940 static void 1941 bstp_timer_start(struct bstp_timer *t, uint16_t v) 1942 { 1943 t->value = v; 1944 t->active = 1; 1945 t->latched = 0; 1946 } 1947 1948 static void 1949 bstp_timer_stop(struct bstp_timer *t) 1950 { 1951 t->value = 0; 1952 t->active = 0; 1953 t->latched = 0; 1954 } 1955 1956 static void 1957 bstp_timer_latch(struct bstp_timer *t) 1958 { 1959 t->latched = 1; 1960 t->active = 1; 1961 } 1962 1963 static int 1964 bstp_timer_dectest(struct bstp_timer *t) 1965 { 1966 if (t->active == 0 || t->latched) 1967 return (0); 1968 t->value -= BSTP_TICK_VAL; 1969 if (t->value <= 0) { 1970 bstp_timer_stop(t); 1971 return (1); 1972 } 1973 return (0); 1974 } 1975 1976 static void 1977 bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp) 1978 { 1979 if ((bp->bp_flags & BSTP_PORT_NEWINFO) || 1980 bp->bp_role == BSTP_ROLE_DESIGNATED || 1981 (bp->bp_role == BSTP_ROLE_ROOT && 1982 bp->bp_tc_timer.active == 1)) { 1983 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 1984 bp->bp_flags |= BSTP_PORT_NEWINFO; 1985 bstp_transmit(bs, bp); 1986 } 1987 } 1988 1989 static void 1990 bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp) 1991 { 1992 if (bp->bp_infois == BSTP_INFO_RECEIVED) { 1993 bp->bp_infois = BSTP_INFO_AGED; 1994 bstp_assign_roles(bs); 1995 DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname); 1996 } 1997 } 1998 1999 static void 2000 bstp_migrate_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 2001 { 2002 bp->bp_flags |= BSTP_PORT_CANMIGRATE; 2003 } 2004 2005 static void 2006 bstp_edge_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 2007 { 2008 if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) && 2009 bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing && 2010 bp->bp_role == BSTP_ROLE_DESIGNATED) { 2011 bp->bp_operedge = 1; 2012 DPRINTF("%s -> edge port\n", bp->bp_ifp->if_xname); 2013 } 2014 } 2015 2016 static int 2017 bstp_addr_cmp(const uint8_t *a, const uint8_t *b) 2018 { 2019 int i, d; 2020 2021 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2022 d = ((int)a[i]) - ((int)b[i]); 2023 } 2024 2025 return (d); 2026 } 2027 2028 /* 2029 * compare the bridge address component of the bridgeid 2030 */ 2031 static int 2032 bstp_same_bridgeid(uint64_t id1, uint64_t id2) 2033 { 2034 u_char addr1[ETHER_ADDR_LEN]; 2035 u_char addr2[ETHER_ADDR_LEN]; 2036 2037 PV2ADDR(id1, addr1); 2038 PV2ADDR(id2, addr2); 2039 2040 if (bstp_addr_cmp(addr1, addr2) == 0) 2041 return (1); 2042 2043 return (0); 2044 } 2045 2046 void 2047 bstp_reinit(struct bstp_state *bs) 2048 { 2049 struct epoch_tracker et; 2050 struct bstp_port *bp; 2051 struct ifnet *ifp, *mif; 2052 u_char *e_addr; 2053 void *bridgeptr; 2054 static const u_char llzero[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 2055 2056 BSTP_LOCK_ASSERT(bs); 2057 2058 if (LIST_EMPTY(&bs->bs_bplist)) 2059 goto disablestp; 2060 2061 mif = NULL; 2062 bridgeptr = LIST_FIRST(&bs->bs_bplist)->bp_ifp->if_bridge; 2063 KASSERT(bridgeptr != NULL, ("Invalid bridge pointer")); 2064 /* 2065 * Search through the Ethernet adapters and find the one with the 2066 * lowest value. Make sure the adapter which we take the MAC address 2067 * from is part of this bridge, so we can have more than one independent 2068 * bridges in the same STP domain. 2069 */ 2070 NET_EPOCH_ENTER(et); 2071 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2072 if (ifp->if_type != IFT_ETHER && ifp->if_type != IFT_L2VLAN) 2073 continue; /* Not Ethernet */ 2074 2075 if (ifp->if_bridge != bridgeptr) 2076 continue; /* Not part of our bridge */ 2077 2078 if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0) 2079 continue; /* No mac address set */ 2080 2081 if (mif == NULL) { 2082 mif = ifp; 2083 continue; 2084 } 2085 if (bstp_addr_cmp(IF_LLADDR(ifp), IF_LLADDR(mif)) < 0) { 2086 mif = ifp; 2087 continue; 2088 } 2089 } 2090 NET_EPOCH_EXIT(et); 2091 if (mif == NULL) 2092 goto disablestp; 2093 2094 e_addr = IF_LLADDR(mif); 2095 bs->bs_bridge_pv.pv_dbridge_id = 2096 (((uint64_t)bs->bs_bridge_priority) << 48) | 2097 (((uint64_t)e_addr[0]) << 40) | 2098 (((uint64_t)e_addr[1]) << 32) | 2099 (((uint64_t)e_addr[2]) << 24) | 2100 (((uint64_t)e_addr[3]) << 16) | 2101 (((uint64_t)e_addr[4]) << 8) | 2102 (((uint64_t)e_addr[5])); 2103 2104 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2105 bs->bs_bridge_pv.pv_cost = 0; 2106 bs->bs_bridge_pv.pv_dport_id = 0; 2107 bs->bs_bridge_pv.pv_port_id = 0; 2108 2109 if (bs->bs_running && callout_pending(&bs->bs_bstpcallout) == 0) 2110 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2111 2112 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2113 bp->bp_port_id = (bp->bp_priority << 8) | 2114 (bp->bp_ifp->if_index & 0xfff); 2115 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 2116 } 2117 2118 bstp_assign_roles(bs); 2119 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 2120 return; 2121 2122 disablestp: 2123 /* Set the bridge and root id (lower bits) to zero */ 2124 bs->bs_bridge_pv.pv_dbridge_id = 2125 ((uint64_t)bs->bs_bridge_priority) << 48; 2126 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2127 bs->bs_root_pv = bs->bs_bridge_pv; 2128 /* Disable any remaining ports, they will have no MAC address */ 2129 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2130 bp->bp_infois = BSTP_INFO_DISABLED; 2131 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2132 } 2133 callout_stop(&bs->bs_bstpcallout); 2134 } 2135 2136 static int 2137 bstp_modevent(module_t mod, int type, void *data) 2138 { 2139 switch (type) { 2140 case MOD_LOAD: 2141 mtx_init(&bstp_list_mtx, "bridgestp list", NULL, MTX_DEF); 2142 LIST_INIT(&bstp_list); 2143 break; 2144 case MOD_UNLOAD: 2145 mtx_destroy(&bstp_list_mtx); 2146 break; 2147 default: 2148 return (EOPNOTSUPP); 2149 } 2150 return (0); 2151 } 2152 2153 static moduledata_t bstp_mod = { 2154 "bridgestp", 2155 bstp_modevent, 2156 0 2157 }; 2158 2159 DECLARE_MODULE(bridgestp, bstp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2160 MODULE_VERSION(bridgestp, 1); 2161 2162 void 2163 bstp_attach(struct bstp_state *bs, struct bstp_cb_ops *cb) 2164 { 2165 BSTP_LOCK_INIT(bs); 2166 callout_init_mtx(&bs->bs_bstpcallout, &bs->bs_mtx, 0); 2167 LIST_INIT(&bs->bs_bplist); 2168 2169 bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 2170 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 2171 bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY; 2172 bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 2173 bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME; 2174 bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY; 2175 bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT; 2176 bs->bs_protover = BSTP_PROTO_RSTP; 2177 bs->bs_state_cb = cb->bcb_state; 2178 bs->bs_rtage_cb = cb->bcb_rtage; 2179 bs->bs_vnet = curvnet; 2180 2181 getmicrotime(&bs->bs_last_tc_time); 2182 2183 mtx_lock(&bstp_list_mtx); 2184 LIST_INSERT_HEAD(&bstp_list, bs, bs_list); 2185 mtx_unlock(&bstp_list_mtx); 2186 } 2187 2188 void 2189 bstp_detach(struct bstp_state *bs) 2190 { 2191 KASSERT(LIST_EMPTY(&bs->bs_bplist), ("bstp still active")); 2192 2193 mtx_lock(&bstp_list_mtx); 2194 LIST_REMOVE(bs, bs_list); 2195 mtx_unlock(&bstp_list_mtx); 2196 callout_drain(&bs->bs_bstpcallout); 2197 BSTP_LOCK_DESTROY(bs); 2198 } 2199 2200 void 2201 bstp_init(struct bstp_state *bs) 2202 { 2203 BSTP_LOCK(bs); 2204 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2205 bs->bs_running = 1; 2206 bstp_reinit(bs); 2207 BSTP_UNLOCK(bs); 2208 } 2209 2210 void 2211 bstp_stop(struct bstp_state *bs) 2212 { 2213 struct bstp_port *bp; 2214 2215 BSTP_LOCK(bs); 2216 2217 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 2218 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2219 2220 bs->bs_running = 0; 2221 callout_stop(&bs->bs_bstpcallout); 2222 BSTP_UNLOCK(bs); 2223 } 2224 2225 int 2226 bstp_create(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *ifp) 2227 { 2228 bzero(bp, sizeof(struct bstp_port)); 2229 2230 BSTP_LOCK(bs); 2231 bp->bp_ifp = ifp; 2232 bp->bp_bs = bs; 2233 bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY; 2234 TASK_INIT(&bp->bp_statetask, 0, bstp_notify_state, bp); 2235 TASK_INIT(&bp->bp_rtagetask, 0, bstp_notify_rtage, bp); 2236 TASK_INIT(&bp->bp_mediatask, 0, bstp_ifupdstatus, bp); 2237 2238 /* Init state */ 2239 bp->bp_infois = BSTP_INFO_DISABLED; 2240 bp->bp_flags = BSTP_PORT_AUTOEDGE|BSTP_PORT_AUTOPTP; 2241 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2242 bstp_set_port_proto(bp, bs->bs_protover); 2243 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2244 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 2245 bp->bp_path_cost = bstp_calc_path_cost(bp); 2246 BSTP_UNLOCK(bs); 2247 return (0); 2248 } 2249 2250 int 2251 bstp_enable(struct bstp_port *bp) 2252 { 2253 struct bstp_state *bs = bp->bp_bs; 2254 struct ifnet *ifp = bp->bp_ifp; 2255 2256 KASSERT(bp->bp_active == 0, ("already a bstp member")); 2257 NET_EPOCH_ASSERT(); /* Because bstp_update_roles() causes traffic. */ 2258 2259 switch (ifp->if_type) { 2260 case IFT_ETHER: /* These can do spanning tree. */ 2261 case IFT_L2VLAN: 2262 break; 2263 default: 2264 /* Nothing else can. */ 2265 return (EINVAL); 2266 } 2267 2268 BSTP_LOCK(bs); 2269 LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next); 2270 bp->bp_active = 1; 2271 bp->bp_flags |= BSTP_PORT_NEWINFO; 2272 bstp_reinit(bs); 2273 bstp_update_roles(bs, bp); 2274 BSTP_UNLOCK(bs); 2275 return (0); 2276 } 2277 2278 void 2279 bstp_disable(struct bstp_port *bp) 2280 { 2281 struct bstp_state *bs = bp->bp_bs; 2282 2283 KASSERT(bp->bp_active == 1, ("not a bstp member")); 2284 2285 BSTP_LOCK(bs); 2286 bstp_disable_port(bs, bp); 2287 LIST_REMOVE(bp, bp_next); 2288 bp->bp_active = 0; 2289 bstp_reinit(bs); 2290 BSTP_UNLOCK(bs); 2291 } 2292 2293 /* 2294 * The bstp_port structure is about to be freed by the parent bridge. 2295 */ 2296 void 2297 bstp_destroy(struct bstp_port *bp) 2298 { 2299 KASSERT(bp->bp_active == 0, ("port is still attached")); 2300 taskqueue_drain(taskqueue_swi, &bp->bp_statetask); 2301 taskqueue_drain(taskqueue_swi, &bp->bp_rtagetask); 2302 taskqueue_drain(taskqueue_swi, &bp->bp_mediatask); 2303 2304 if (bp->bp_bs->bs_root_port == bp) 2305 bstp_assign_roles(bp->bp_bs); 2306 } 2307