1 /* $NetBSD: bridgestp.c,v 1.5 2003/11/28 08:56:48 keihan Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause 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_private.h> 59 #include <net/if_dl.h> 60 #include <net/if_types.h> 61 #include <net/if_llc.h> 62 #include <net/if_media.h> 63 #include <net/vnet.h> 64 65 #include <netinet/in.h> 66 #include <netinet/in_systm.h> 67 #include <netinet/in_var.h> 68 #include <netinet/if_ether.h> 69 #include <net/bridgestp.h> 70 71 #ifdef BRIDGESTP_DEBUG 72 #define DPRINTF(fmt, arg...) printf("bstp: " fmt, ##arg) 73 #else 74 #define DPRINTF(fmt, arg...) (void)0 75 #endif 76 77 #define PV2ADDR(pv, eaddr) do { \ 78 eaddr[0] = pv >> 40; \ 79 eaddr[1] = pv >> 32; \ 80 eaddr[2] = pv >> 24; \ 81 eaddr[3] = pv >> 16; \ 82 eaddr[4] = pv >> 8; \ 83 eaddr[5] = pv >> 0; \ 84 } while (0) 85 86 #define INFO_BETTER 1 87 #define INFO_SAME 0 88 #define INFO_WORSE -1 89 90 const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; 91 92 LIST_HEAD(, bstp_state) bstp_list; 93 static struct mtx bstp_list_mtx; 94 95 static void bstp_transmit(struct bstp_state *, struct bstp_port *); 96 static void bstp_transmit_bpdu(struct bstp_state *, struct bstp_port *); 97 static void bstp_transmit_tcn(struct bstp_state *, struct bstp_port *); 98 static void bstp_decode_bpdu(struct bstp_port *, struct bstp_cbpdu *, 99 struct bstp_config_unit *); 100 static void bstp_send_bpdu(struct bstp_state *, struct bstp_port *, 101 struct bstp_cbpdu *); 102 static int bstp_pdu_flags(struct bstp_port *); 103 static void bstp_received_stp(struct bstp_state *, struct bstp_port *, 104 struct mbuf **, struct bstp_tbpdu *); 105 static void bstp_received_rstp(struct bstp_state *, struct bstp_port *, 106 struct mbuf **, struct bstp_tbpdu *); 107 static void bstp_received_tcn(struct bstp_state *, struct bstp_port *, 108 struct bstp_tcn_unit *); 109 static void bstp_received_bpdu(struct bstp_state *, struct bstp_port *, 110 struct bstp_config_unit *); 111 static int bstp_pdu_rcvtype(struct bstp_port *, struct bstp_config_unit *); 112 static int bstp_pdu_bettersame(struct bstp_port *, int); 113 static int bstp_info_cmp(struct bstp_pri_vector *, 114 struct bstp_pri_vector *); 115 static int bstp_info_superior(struct bstp_pri_vector *, 116 struct bstp_pri_vector *); 117 static void bstp_assign_roles(struct bstp_state *); 118 static void bstp_update_roles(struct bstp_state *, struct bstp_port *); 119 static void bstp_update_state(struct bstp_state *, struct bstp_port *); 120 static void bstp_update_tc(struct bstp_port *); 121 static void bstp_update_info(struct bstp_port *); 122 static void bstp_set_other_tcprop(struct bstp_port *); 123 static void bstp_set_all_reroot(struct bstp_state *); 124 static void bstp_set_all_sync(struct bstp_state *); 125 static void bstp_set_port_state(struct bstp_port *, int); 126 static void bstp_set_port_role(struct bstp_port *, int); 127 static void bstp_set_port_proto(struct bstp_port *, int); 128 static void bstp_set_port_tc(struct bstp_port *, int); 129 static void bstp_set_timer_tc(struct bstp_port *); 130 static void bstp_set_timer_msgage(struct bstp_port *); 131 static int bstp_rerooted(struct bstp_state *, struct bstp_port *); 132 static uint32_t bstp_calc_path_cost(struct bstp_port *); 133 static void bstp_notify_state(void *, int); 134 static void bstp_notify_rtage(void *, int); 135 static void bstp_ifupdstatus(void *, int); 136 static void bstp_enable_port(struct bstp_state *, struct bstp_port *); 137 static void bstp_disable_port(struct bstp_state *, struct bstp_port *); 138 static void bstp_tick(void *); 139 static void bstp_timer_start(struct bstp_timer *, uint16_t); 140 static void bstp_timer_stop(struct bstp_timer *); 141 static void bstp_timer_latch(struct bstp_timer *); 142 static int bstp_timer_dectest(struct bstp_timer *); 143 static void bstp_hello_timer_expiry(struct bstp_state *, 144 struct bstp_port *); 145 static void bstp_message_age_expiry(struct bstp_state *, 146 struct bstp_port *); 147 static void bstp_migrate_delay_expiry(struct bstp_state *, 148 struct bstp_port *); 149 static void bstp_edge_delay_expiry(struct bstp_state *, 150 struct bstp_port *); 151 static int bstp_addr_cmp(const uint8_t *, const uint8_t *); 152 static int bstp_same_bridgeid(uint64_t, uint64_t); 153 static void bstp_reinit(struct bstp_state *); 154 155 static void 156 bstp_transmit(struct bstp_state *bs, struct bstp_port *bp) 157 { 158 NET_EPOCH_ASSERT(); 159 160 if (bs->bs_running == 0) 161 return; 162 163 /* 164 * a PDU can only be sent if we have tx quota left and the 165 * hello timer is running. 166 */ 167 if (bp->bp_hello_timer.active == 0) { 168 /* Test if it needs to be reset */ 169 bstp_hello_timer_expiry(bs, bp); 170 return; 171 } 172 if (bp->bp_txcount > bs->bs_txholdcount) 173 /* Ran out of karma */ 174 return; 175 176 if (bp->bp_protover == BSTP_PROTO_RSTP) { 177 bstp_transmit_bpdu(bs, bp); 178 bp->bp_tc_ack = 0; 179 } else { /* STP */ 180 switch (bp->bp_role) { 181 case BSTP_ROLE_DESIGNATED: 182 bstp_transmit_bpdu(bs, bp); 183 bp->bp_tc_ack = 0; 184 break; 185 186 case BSTP_ROLE_ROOT: 187 bstp_transmit_tcn(bs, bp); 188 break; 189 } 190 } 191 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 192 bp->bp_flags &= ~BSTP_PORT_NEWINFO; 193 } 194 195 static void 196 bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp) 197 { 198 struct bstp_cbpdu bpdu; 199 200 BSTP_LOCK_ASSERT(bs); 201 202 bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48); 203 PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr); 204 205 bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost); 206 207 bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48); 208 PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr); 209 210 bpdu.cbu_portid = htons(bp->bp_port_id); 211 bpdu.cbu_messageage = htons(bp->bp_desg_msg_age); 212 bpdu.cbu_maxage = htons(bp->bp_desg_max_age); 213 bpdu.cbu_hellotime = htons(bp->bp_desg_htime); 214 bpdu.cbu_forwarddelay = htons(bp->bp_desg_fdelay); 215 216 bpdu.cbu_flags = bstp_pdu_flags(bp); 217 218 switch (bp->bp_protover) { 219 case BSTP_PROTO_STP: 220 bpdu.cbu_bpdutype = BSTP_MSGTYPE_CFG; 221 break; 222 223 case BSTP_PROTO_RSTP: 224 bpdu.cbu_bpdutype = BSTP_MSGTYPE_RSTP; 225 break; 226 } 227 228 bstp_send_bpdu(bs, bp, &bpdu); 229 } 230 231 static void 232 bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp) 233 { 234 struct bstp_tbpdu bpdu; 235 struct ifnet *ifp = bp->bp_ifp; 236 struct ether_header *eh; 237 struct mbuf *m; 238 239 KASSERT(bp == bs->bs_root_port, ("%s: bad root port\n", __func__)); 240 241 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 242 return; 243 244 m = m_gethdr(M_NOWAIT, MT_DATA); 245 if (m == NULL) 246 return; 247 248 m->m_pkthdr.rcvif = ifp; 249 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); 250 m->m_len = m->m_pkthdr.len; 251 252 eh = mtod(m, struct ether_header *); 253 254 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); 255 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 256 eh->ether_type = htons(sizeof(bpdu)); 257 258 bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP; 259 bpdu.tbu_ctl = LLC_UI; 260 bpdu.tbu_protoid = 0; 261 bpdu.tbu_protover = 0; 262 bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN; 263 264 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu)); 265 266 bp->bp_txcount++; 267 ifp->if_transmit(ifp, m); 268 } 269 270 static void 271 bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu, 272 struct bstp_config_unit *cu) 273 { 274 int flags; 275 276 cu->cu_pv.pv_root_id = 277 (((uint64_t)ntohs(cpdu->cbu_rootpri)) << 48) | 278 (((uint64_t)cpdu->cbu_rootaddr[0]) << 40) | 279 (((uint64_t)cpdu->cbu_rootaddr[1]) << 32) | 280 (((uint64_t)cpdu->cbu_rootaddr[2]) << 24) | 281 (((uint64_t)cpdu->cbu_rootaddr[3]) << 16) | 282 (((uint64_t)cpdu->cbu_rootaddr[4]) << 8) | 283 (((uint64_t)cpdu->cbu_rootaddr[5]) << 0); 284 285 cu->cu_pv.pv_dbridge_id = 286 (((uint64_t)ntohs(cpdu->cbu_bridgepri)) << 48) | 287 (((uint64_t)cpdu->cbu_bridgeaddr[0]) << 40) | 288 (((uint64_t)cpdu->cbu_bridgeaddr[1]) << 32) | 289 (((uint64_t)cpdu->cbu_bridgeaddr[2]) << 24) | 290 (((uint64_t)cpdu->cbu_bridgeaddr[3]) << 16) | 291 (((uint64_t)cpdu->cbu_bridgeaddr[4]) << 8) | 292 (((uint64_t)cpdu->cbu_bridgeaddr[5]) << 0); 293 294 cu->cu_pv.pv_cost = ntohl(cpdu->cbu_rootpathcost); 295 cu->cu_message_age = ntohs(cpdu->cbu_messageage); 296 cu->cu_max_age = ntohs(cpdu->cbu_maxage); 297 cu->cu_hello_time = ntohs(cpdu->cbu_hellotime); 298 cu->cu_forward_delay = ntohs(cpdu->cbu_forwarddelay); 299 cu->cu_pv.pv_dport_id = ntohs(cpdu->cbu_portid); 300 cu->cu_pv.pv_port_id = bp->bp_port_id; 301 cu->cu_message_type = cpdu->cbu_bpdutype; 302 303 /* Strip off unused flags in STP mode */ 304 flags = cpdu->cbu_flags; 305 switch (cpdu->cbu_protover) { 306 case BSTP_PROTO_STP: 307 flags &= BSTP_PDU_STPMASK; 308 /* A STP BPDU explicitly conveys a Designated Port */ 309 cu->cu_role = BSTP_ROLE_DESIGNATED; 310 break; 311 312 case BSTP_PROTO_RSTP: 313 flags &= BSTP_PDU_RSTPMASK; 314 break; 315 } 316 317 cu->cu_topology_change_ack = 318 (flags & BSTP_PDU_F_TCA) ? 1 : 0; 319 cu->cu_proposal = 320 (flags & BSTP_PDU_F_P) ? 1 : 0; 321 cu->cu_agree = 322 (flags & BSTP_PDU_F_A) ? 1 : 0; 323 cu->cu_learning = 324 (flags & BSTP_PDU_F_L) ? 1 : 0; 325 cu->cu_forwarding = 326 (flags & BSTP_PDU_F_F) ? 1 : 0; 327 cu->cu_topology_change = 328 (flags & BSTP_PDU_F_TC) ? 1 : 0; 329 330 switch ((flags & BSTP_PDU_PRMASK) >> BSTP_PDU_PRSHIFT) { 331 case BSTP_PDU_F_ROOT: 332 cu->cu_role = BSTP_ROLE_ROOT; 333 break; 334 case BSTP_PDU_F_ALT: 335 cu->cu_role = BSTP_ROLE_ALTERNATE; 336 break; 337 case BSTP_PDU_F_DESG: 338 cu->cu_role = BSTP_ROLE_DESIGNATED; 339 break; 340 } 341 } 342 343 static void 344 bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp, 345 struct bstp_cbpdu *bpdu) 346 { 347 struct ifnet *ifp; 348 struct mbuf *m; 349 struct ether_header *eh; 350 351 BSTP_LOCK_ASSERT(bs); 352 NET_EPOCH_ASSERT(); 353 354 ifp = bp->bp_ifp; 355 356 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 357 return; 358 359 m = m_gethdr(M_NOWAIT, MT_DATA); 360 if (m == NULL) 361 return; 362 363 eh = mtod(m, struct ether_header *); 364 365 bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP; 366 bpdu->cbu_ctl = LLC_UI; 367 bpdu->cbu_protoid = htons(BSTP_PROTO_ID); 368 369 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); 370 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 371 372 switch (bpdu->cbu_bpdutype) { 373 case BSTP_MSGTYPE_CFG: 374 bpdu->cbu_protover = BSTP_PROTO_STP; 375 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_STP_LEN; 376 eh->ether_type = htons(BSTP_BPDU_STP_LEN); 377 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, 378 BSTP_BPDU_STP_LEN); 379 break; 380 381 case BSTP_MSGTYPE_RSTP: 382 bpdu->cbu_protover = BSTP_PROTO_RSTP; 383 bpdu->cbu_versionlen = htons(0); 384 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_RSTP_LEN; 385 eh->ether_type = htons(BSTP_BPDU_RSTP_LEN); 386 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, 387 BSTP_BPDU_RSTP_LEN); 388 break; 389 390 default: 391 panic("not implemented"); 392 } 393 m->m_pkthdr.rcvif = ifp; 394 m->m_len = m->m_pkthdr.len; 395 396 bp->bp_txcount++; 397 ifp->if_transmit(ifp, m); 398 } 399 400 static int 401 bstp_pdu_flags(struct bstp_port *bp) 402 { 403 int flags = 0; 404 405 if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING) 406 flags |= BSTP_PDU_F_P; 407 408 if (bp->bp_agree) 409 flags |= BSTP_PDU_F_A; 410 411 if (bp->bp_tc_timer.active) 412 flags |= BSTP_PDU_F_TC; 413 414 if (bp->bp_tc_ack) 415 flags |= BSTP_PDU_F_TCA; 416 417 switch (bp->bp_state) { 418 case BSTP_IFSTATE_LEARNING: 419 flags |= BSTP_PDU_F_L; 420 break; 421 422 case BSTP_IFSTATE_FORWARDING: 423 flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F); 424 break; 425 } 426 427 switch (bp->bp_role) { 428 case BSTP_ROLE_ROOT: 429 flags |= 430 (BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT); 431 break; 432 433 case BSTP_ROLE_ALTERNATE: 434 case BSTP_ROLE_BACKUP: /* fall through */ 435 flags |= 436 (BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT); 437 break; 438 439 case BSTP_ROLE_DESIGNATED: 440 flags |= 441 (BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT); 442 break; 443 } 444 445 /* Strip off unused flags in either mode */ 446 switch (bp->bp_protover) { 447 case BSTP_PROTO_STP: 448 flags &= BSTP_PDU_STPMASK; 449 break; 450 case BSTP_PROTO_RSTP: 451 flags &= BSTP_PDU_RSTPMASK; 452 break; 453 } 454 return (flags); 455 } 456 457 void 458 bstp_input(struct bstp_port *bp, struct ifnet *ifp, struct mbuf *m) 459 { 460 struct bstp_state *bs = bp->bp_bs; 461 struct ether_header *eh; 462 struct bstp_tbpdu tpdu; 463 uint16_t len; 464 465 if (bp->bp_active == 0) { 466 m_freem(m); 467 return; 468 } 469 470 BSTP_LOCK(bs); 471 472 eh = mtod(m, struct ether_header *); 473 474 len = ntohs(eh->ether_type); 475 if (len < sizeof(tpdu)) 476 goto out; 477 478 m_adj(m, ETHER_HDR_LEN); 479 480 if (m->m_pkthdr.len > len) 481 m_adj(m, len - m->m_pkthdr.len); 482 if (m->m_len < sizeof(tpdu) && 483 (m = m_pullup(m, sizeof(tpdu))) == NULL) 484 goto out; 485 486 memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu)); 487 488 /* basic packet checks */ 489 if (tpdu.tbu_dsap != LLC_8021D_LSAP || 490 tpdu.tbu_ssap != LLC_8021D_LSAP || 491 tpdu.tbu_ctl != LLC_UI) 492 goto out; 493 if (tpdu.tbu_protoid != BSTP_PROTO_ID) 494 goto out; 495 496 /* 497 * We can treat later versions of the PDU as the same as the maximum 498 * version we implement. All additional parameters/flags are ignored. 499 */ 500 if (tpdu.tbu_protover > BSTP_PROTO_MAX) 501 tpdu.tbu_protover = BSTP_PROTO_MAX; 502 503 if (tpdu.tbu_protover != bp->bp_protover) { 504 /* 505 * Wait for the migration delay timer to expire before changing 506 * protocol version to avoid flip-flops. 507 */ 508 if (bp->bp_flags & BSTP_PORT_CANMIGRATE) 509 bstp_set_port_proto(bp, tpdu.tbu_protover); 510 else 511 goto out; 512 } 513 514 /* Clear operedge upon receiving a PDU on the port */ 515 bp->bp_operedge = 0; 516 bstp_timer_start(&bp->bp_edge_delay_timer, 517 BSTP_DEFAULT_MIGRATE_DELAY); 518 519 switch (tpdu.tbu_protover) { 520 case BSTP_PROTO_STP: 521 bstp_received_stp(bs, bp, &m, &tpdu); 522 break; 523 524 case BSTP_PROTO_RSTP: 525 bstp_received_rstp(bs, bp, &m, &tpdu); 526 break; 527 } 528 out: 529 BSTP_UNLOCK(bs); 530 if (m) 531 m_freem(m); 532 } 533 534 static void 535 bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp, 536 struct mbuf **mp, struct bstp_tbpdu *tpdu) 537 { 538 struct bstp_cbpdu cpdu; 539 struct bstp_config_unit *cu = &bp->bp_msg_cu; 540 struct bstp_tcn_unit tu; 541 542 switch (tpdu->tbu_bpdutype) { 543 case BSTP_MSGTYPE_TCN: 544 tu.tu_message_type = tpdu->tbu_bpdutype; 545 bstp_received_tcn(bs, bp, &tu); 546 break; 547 case BSTP_MSGTYPE_CFG: 548 if ((*mp)->m_len < BSTP_BPDU_STP_LEN && 549 (*mp = m_pullup(*mp, BSTP_BPDU_STP_LEN)) == NULL) 550 return; 551 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_STP_LEN); 552 553 bstp_decode_bpdu(bp, &cpdu, cu); 554 bstp_received_bpdu(bs, bp, cu); 555 break; 556 } 557 } 558 559 static void 560 bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp, 561 struct mbuf **mp, struct bstp_tbpdu *tpdu) 562 { 563 struct bstp_cbpdu cpdu; 564 struct bstp_config_unit *cu = &bp->bp_msg_cu; 565 566 if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP) 567 return; 568 569 if ((*mp)->m_len < BSTP_BPDU_RSTP_LEN && 570 (*mp = m_pullup(*mp, BSTP_BPDU_RSTP_LEN)) == NULL) 571 return; 572 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_RSTP_LEN); 573 574 bstp_decode_bpdu(bp, &cpdu, cu); 575 bstp_received_bpdu(bs, bp, cu); 576 } 577 578 static void 579 bstp_received_tcn(struct bstp_state *bs, struct bstp_port *bp, 580 struct bstp_tcn_unit *tcn) 581 { 582 bp->bp_rcvdtcn = 1; 583 bstp_update_tc(bp); 584 } 585 586 static void 587 bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp, 588 struct bstp_config_unit *cu) 589 { 590 int type; 591 592 BSTP_LOCK_ASSERT(bs); 593 594 /* We need to have transitioned to INFO_MINE before proceeding */ 595 switch (bp->bp_infois) { 596 case BSTP_INFO_DISABLED: 597 case BSTP_INFO_AGED: 598 return; 599 } 600 601 /* range checks */ 602 if (cu->cu_message_age >= cu->cu_max_age) { 603 return; 604 } 605 if (cu->cu_max_age < BSTP_MIN_MAX_AGE || 606 cu->cu_max_age > BSTP_MAX_MAX_AGE) { 607 return; 608 } 609 if (cu->cu_forward_delay < BSTP_MIN_FORWARD_DELAY || 610 cu->cu_forward_delay > BSTP_MAX_FORWARD_DELAY) { 611 return; 612 } 613 if (cu->cu_hello_time < BSTP_MIN_HELLO_TIME || 614 cu->cu_hello_time > BSTP_MAX_HELLO_TIME) { 615 return; 616 } 617 618 type = bstp_pdu_rcvtype(bp, cu); 619 620 switch (type) { 621 case BSTP_PDU_SUPERIOR: 622 bs->bs_allsynced = 0; 623 bp->bp_agreed = 0; 624 bp->bp_proposing = 0; 625 626 if (cu->cu_proposal && cu->cu_forwarding == 0) 627 bp->bp_proposed = 1; 628 if (cu->cu_topology_change) 629 bp->bp_rcvdtc = 1; 630 if (cu->cu_topology_change_ack) 631 bp->bp_rcvdtca = 1; 632 633 if (bp->bp_agree && 634 !bstp_pdu_bettersame(bp, BSTP_INFO_RECEIVED)) 635 bp->bp_agree = 0; 636 637 /* copy the received priority and timers to the port */ 638 bp->bp_port_pv = cu->cu_pv; 639 bp->bp_port_msg_age = cu->cu_message_age; 640 bp->bp_port_max_age = cu->cu_max_age; 641 bp->bp_port_fdelay = cu->cu_forward_delay; 642 bp->bp_port_htime = 643 (cu->cu_hello_time > BSTP_MIN_HELLO_TIME ? 644 cu->cu_hello_time : BSTP_MIN_HELLO_TIME); 645 646 /* set expiry for the new info */ 647 bstp_set_timer_msgage(bp); 648 649 bp->bp_infois = BSTP_INFO_RECEIVED; 650 bstp_assign_roles(bs); 651 break; 652 653 case BSTP_PDU_REPEATED: 654 if (cu->cu_proposal && cu->cu_forwarding == 0) 655 bp->bp_proposed = 1; 656 if (cu->cu_topology_change) 657 bp->bp_rcvdtc = 1; 658 if (cu->cu_topology_change_ack) 659 bp->bp_rcvdtca = 1; 660 661 /* rearm the age timer */ 662 bstp_set_timer_msgage(bp); 663 break; 664 665 case BSTP_PDU_INFERIOR: 666 if (cu->cu_learning) { 667 bp->bp_agreed = 1; 668 bp->bp_proposing = 0; 669 } 670 break; 671 672 case BSTP_PDU_INFERIORALT: 673 /* 674 * only point to point links are allowed fast 675 * transitions to forwarding. 676 */ 677 if (cu->cu_agree && bp->bp_ptp_link) { 678 bp->bp_agreed = 1; 679 bp->bp_proposing = 0; 680 } else 681 bp->bp_agreed = 0; 682 683 if (cu->cu_topology_change) 684 bp->bp_rcvdtc = 1; 685 if (cu->cu_topology_change_ack) 686 bp->bp_rcvdtca = 1; 687 break; 688 689 case BSTP_PDU_OTHER: 690 return; /* do nothing */ 691 } 692 /* update the state machines with the new data */ 693 bstp_update_state(bs, bp); 694 } 695 696 static int 697 bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu) 698 { 699 int type; 700 701 /* default return type */ 702 type = BSTP_PDU_OTHER; 703 704 switch (cu->cu_role) { 705 case BSTP_ROLE_DESIGNATED: 706 if (bstp_info_superior(&bp->bp_port_pv, &cu->cu_pv)) 707 /* bpdu priority is superior */ 708 type = BSTP_PDU_SUPERIOR; 709 else if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) == 710 INFO_SAME) { 711 if (bp->bp_port_msg_age != cu->cu_message_age || 712 bp->bp_port_max_age != cu->cu_max_age || 713 bp->bp_port_fdelay != cu->cu_forward_delay || 714 bp->bp_port_htime != cu->cu_hello_time) 715 /* bpdu priority is equal and timers differ */ 716 type = BSTP_PDU_SUPERIOR; 717 else 718 /* bpdu is equal */ 719 type = BSTP_PDU_REPEATED; 720 } else 721 /* bpdu priority is worse */ 722 type = BSTP_PDU_INFERIOR; 723 724 break; 725 726 case BSTP_ROLE_ROOT: 727 case BSTP_ROLE_ALTERNATE: 728 case BSTP_ROLE_BACKUP: 729 if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) <= INFO_SAME) 730 /* 731 * not a designated port and priority is the same or 732 * worse 733 */ 734 type = BSTP_PDU_INFERIORALT; 735 break; 736 } 737 738 return (type); 739 } 740 741 static int 742 bstp_pdu_bettersame(struct bstp_port *bp, int newinfo) 743 { 744 if (newinfo == BSTP_INFO_RECEIVED && 745 bp->bp_infois == BSTP_INFO_RECEIVED && 746 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME) 747 return (1); 748 749 if (newinfo == BSTP_INFO_MINE && 750 bp->bp_infois == BSTP_INFO_MINE && 751 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) >= INFO_SAME) 752 return (1); 753 754 return (0); 755 } 756 757 static int 758 bstp_info_cmp(struct bstp_pri_vector *pv, 759 struct bstp_pri_vector *cpv) 760 { 761 if (cpv->pv_root_id < pv->pv_root_id) 762 return (INFO_BETTER); 763 if (cpv->pv_root_id > pv->pv_root_id) 764 return (INFO_WORSE); 765 766 if (cpv->pv_cost < pv->pv_cost) 767 return (INFO_BETTER); 768 if (cpv->pv_cost > pv->pv_cost) 769 return (INFO_WORSE); 770 771 if (cpv->pv_dbridge_id < pv->pv_dbridge_id) 772 return (INFO_BETTER); 773 if (cpv->pv_dbridge_id > pv->pv_dbridge_id) 774 return (INFO_WORSE); 775 776 if (cpv->pv_dport_id < pv->pv_dport_id) 777 return (INFO_BETTER); 778 if (cpv->pv_dport_id > pv->pv_dport_id) 779 return (INFO_WORSE); 780 781 return (INFO_SAME); 782 } 783 784 /* 785 * This message priority vector is superior to the port priority vector and 786 * will replace it if, and only if, the message priority vector is better than 787 * the port priority vector, or the message has been transmitted from the same 788 * designated bridge and designated port as the port priority vector. 789 */ 790 static int 791 bstp_info_superior(struct bstp_pri_vector *pv, 792 struct bstp_pri_vector *cpv) 793 { 794 if (bstp_info_cmp(pv, cpv) == INFO_BETTER || 795 (bstp_same_bridgeid(pv->pv_dbridge_id, cpv->pv_dbridge_id) && 796 (cpv->pv_dport_id & 0xfff) == (pv->pv_dport_id & 0xfff))) 797 return (1); 798 return (0); 799 } 800 801 static void 802 bstp_assign_roles(struct bstp_state *bs) 803 { 804 struct bstp_port *bp, *rbp = NULL; 805 struct bstp_pri_vector pv; 806 807 /* default to our priority vector */ 808 bs->bs_root_pv = bs->bs_bridge_pv; 809 bs->bs_root_msg_age = 0; 810 bs->bs_root_max_age = bs->bs_bridge_max_age; 811 bs->bs_root_fdelay = bs->bs_bridge_fdelay; 812 bs->bs_root_htime = bs->bs_bridge_htime; 813 bs->bs_root_port = NULL; 814 815 /* check if any received info supersedes us */ 816 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 817 if (bp->bp_infois != BSTP_INFO_RECEIVED) 818 continue; 819 820 pv = bp->bp_port_pv; 821 pv.pv_cost += bp->bp_path_cost; 822 823 /* 824 * The root priority vector is the best of the set comprising 825 * the bridge priority vector plus all root path priority 826 * vectors whose bridge address is not equal to us. 827 */ 828 if (bstp_same_bridgeid(pv.pv_dbridge_id, 829 bs->bs_bridge_pv.pv_dbridge_id) == 0 && 830 bstp_info_cmp(&bs->bs_root_pv, &pv) == INFO_BETTER) { 831 /* the port vector replaces the root */ 832 bs->bs_root_pv = pv; 833 bs->bs_root_msg_age = bp->bp_port_msg_age + 834 BSTP_MESSAGE_AGE_INCR; 835 bs->bs_root_max_age = bp->bp_port_max_age; 836 bs->bs_root_fdelay = bp->bp_port_fdelay; 837 bs->bs_root_htime = bp->bp_port_htime; 838 rbp = bp; 839 } 840 } 841 842 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 843 /* calculate the port designated vector */ 844 bp->bp_desg_pv.pv_root_id = bs->bs_root_pv.pv_root_id; 845 bp->bp_desg_pv.pv_cost = bs->bs_root_pv.pv_cost; 846 bp->bp_desg_pv.pv_dbridge_id = bs->bs_bridge_pv.pv_dbridge_id; 847 bp->bp_desg_pv.pv_dport_id = bp->bp_port_id; 848 bp->bp_desg_pv.pv_port_id = bp->bp_port_id; 849 850 /* calculate designated times */ 851 bp->bp_desg_msg_age = bs->bs_root_msg_age; 852 bp->bp_desg_max_age = bs->bs_root_max_age; 853 bp->bp_desg_fdelay = bs->bs_root_fdelay; 854 bp->bp_desg_htime = bs->bs_bridge_htime; 855 856 switch (bp->bp_infois) { 857 case BSTP_INFO_DISABLED: 858 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 859 break; 860 861 case BSTP_INFO_AGED: 862 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 863 bstp_update_info(bp); 864 break; 865 866 case BSTP_INFO_MINE: 867 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 868 /* update the port info if stale */ 869 if (bstp_info_cmp(&bp->bp_port_pv, 870 &bp->bp_desg_pv) != INFO_SAME || 871 (rbp != NULL && 872 (bp->bp_port_msg_age != rbp->bp_port_msg_age || 873 bp->bp_port_max_age != rbp->bp_port_max_age || 874 bp->bp_port_fdelay != rbp->bp_port_fdelay || 875 bp->bp_port_htime != rbp->bp_port_htime))) 876 bstp_update_info(bp); 877 break; 878 879 case BSTP_INFO_RECEIVED: 880 if (bp == rbp) { 881 /* 882 * root priority is derived from this 883 * port, make it the root port. 884 */ 885 bstp_set_port_role(bp, BSTP_ROLE_ROOT); 886 bs->bs_root_port = bp; 887 } else if (bstp_info_cmp(&bp->bp_port_pv, 888 &bp->bp_desg_pv) == INFO_BETTER) { 889 /* 890 * the port priority is lower than the root 891 * port. 892 */ 893 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 894 bstp_update_info(bp); 895 } else { 896 if (bstp_same_bridgeid( 897 bp->bp_port_pv.pv_dbridge_id, 898 bs->bs_bridge_pv.pv_dbridge_id)) { 899 /* 900 * the designated bridge refers to 901 * another port on this bridge. 902 */ 903 bstp_set_port_role(bp, 904 BSTP_ROLE_BACKUP); 905 } else { 906 /* 907 * the port is an inferior path to the 908 * root bridge. 909 */ 910 bstp_set_port_role(bp, 911 BSTP_ROLE_ALTERNATE); 912 } 913 } 914 break; 915 } 916 } 917 } 918 919 static void 920 bstp_update_state(struct bstp_state *bs, struct bstp_port *bp) 921 { 922 struct bstp_port *bp2; 923 int synced; 924 925 BSTP_LOCK_ASSERT(bs); 926 927 /* check if all the ports have syncronised again */ 928 if (!bs->bs_allsynced) { 929 synced = 1; 930 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 931 if (!(bp2->bp_synced || 932 bp2->bp_role == BSTP_ROLE_ROOT)) { 933 synced = 0; 934 break; 935 } 936 } 937 bs->bs_allsynced = synced; 938 } 939 940 bstp_update_roles(bs, bp); 941 bstp_update_tc(bp); 942 } 943 944 static void 945 bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp) 946 { 947 NET_EPOCH_ASSERT(); 948 949 switch (bp->bp_role) { 950 case BSTP_ROLE_DISABLED: 951 /* Clear any flags if set */ 952 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 953 bp->bp_sync = 0; 954 bp->bp_synced = 1; 955 bp->bp_reroot = 0; 956 } 957 break; 958 959 case BSTP_ROLE_ALTERNATE: 960 case BSTP_ROLE_BACKUP: 961 if ((bs->bs_allsynced && !bp->bp_agree) || 962 (bp->bp_proposed && bp->bp_agree)) { 963 bp->bp_proposed = 0; 964 bp->bp_agree = 1; 965 bp->bp_flags |= BSTP_PORT_NEWINFO; 966 DPRINTF("%s -> ALTERNATE_AGREED\n", 967 bp->bp_ifp->if_xname); 968 } 969 970 if (bp->bp_proposed && !bp->bp_agree) { 971 bstp_set_all_sync(bs); 972 bp->bp_proposed = 0; 973 DPRINTF("%s -> ALTERNATE_PROPOSED\n", 974 bp->bp_ifp->if_xname); 975 } 976 977 /* Clear any flags if set */ 978 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 979 bp->bp_sync = 0; 980 bp->bp_synced = 1; 981 bp->bp_reroot = 0; 982 DPRINTF("%s -> ALTERNATE_PORT\n", bp->bp_ifp->if_xname); 983 } 984 break; 985 986 case BSTP_ROLE_ROOT: 987 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) { 988 bstp_set_all_reroot(bs); 989 DPRINTF("%s -> ROOT_REROOT\n", bp->bp_ifp->if_xname); 990 } 991 992 if ((bs->bs_allsynced && !bp->bp_agree) || 993 (bp->bp_proposed && bp->bp_agree)) { 994 bp->bp_proposed = 0; 995 bp->bp_sync = 0; 996 bp->bp_agree = 1; 997 bp->bp_flags |= BSTP_PORT_NEWINFO; 998 DPRINTF("%s -> ROOT_AGREED\n", bp->bp_ifp->if_xname); 999 } 1000 1001 if (bp->bp_proposed && !bp->bp_agree) { 1002 bstp_set_all_sync(bs); 1003 bp->bp_proposed = 0; 1004 DPRINTF("%s -> ROOT_PROPOSED\n", bp->bp_ifp->if_xname); 1005 } 1006 1007 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1008 (bp->bp_forward_delay_timer.active == 0 || 1009 (bstp_rerooted(bs, bp) && 1010 bp->bp_recent_backup_timer.active == 0 && 1011 bp->bp_protover == BSTP_PROTO_RSTP))) { 1012 switch (bp->bp_state) { 1013 case BSTP_IFSTATE_DISCARDING: 1014 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 1015 break; 1016 case BSTP_IFSTATE_LEARNING: 1017 bstp_set_port_state(bp, 1018 BSTP_IFSTATE_FORWARDING); 1019 break; 1020 } 1021 } 1022 1023 if (bp->bp_state == BSTP_IFSTATE_FORWARDING && bp->bp_reroot) { 1024 bp->bp_reroot = 0; 1025 DPRINTF("%s -> ROOT_REROOTED\n", bp->bp_ifp->if_xname); 1026 } 1027 break; 1028 1029 case BSTP_ROLE_DESIGNATED: 1030 if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) { 1031 bp->bp_reroot = 0; 1032 DPRINTF("%s -> DESIGNATED_RETIRED\n", 1033 bp->bp_ifp->if_xname); 1034 } 1035 1036 if ((bp->bp_state == BSTP_IFSTATE_DISCARDING && 1037 !bp->bp_synced) || (bp->bp_agreed && !bp->bp_synced) || 1038 (bp->bp_operedge && !bp->bp_synced) || 1039 (bp->bp_sync && bp->bp_synced)) { 1040 bstp_timer_stop(&bp->bp_recent_root_timer); 1041 bp->bp_synced = 1; 1042 bp->bp_sync = 0; 1043 DPRINTF("%s -> DESIGNATED_SYNCED\n", 1044 bp->bp_ifp->if_xname); 1045 } 1046 1047 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1048 !bp->bp_agreed && !bp->bp_proposing && 1049 !bp->bp_operedge) { 1050 bp->bp_proposing = 1; 1051 bp->bp_flags |= BSTP_PORT_NEWINFO; 1052 bstp_timer_start(&bp->bp_edge_delay_timer, 1053 (bp->bp_ptp_link ? BSTP_DEFAULT_MIGRATE_DELAY : 1054 bp->bp_desg_max_age)); 1055 DPRINTF("%s -> DESIGNATED_PROPOSE\n", 1056 bp->bp_ifp->if_xname); 1057 } 1058 1059 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1060 (bp->bp_forward_delay_timer.active == 0 || bp->bp_agreed || 1061 bp->bp_operedge) && 1062 (bp->bp_recent_root_timer.active == 0 || !bp->bp_reroot) && 1063 !bp->bp_sync) { 1064 if (bp->bp_agreed) 1065 DPRINTF("%s -> AGREED\n", bp->bp_ifp->if_xname); 1066 /* 1067 * If agreed|operedge then go straight to forwarding, 1068 * otherwise follow discard -> learn -> forward. 1069 */ 1070 if (bp->bp_agreed || bp->bp_operedge || 1071 bp->bp_state == BSTP_IFSTATE_LEARNING) { 1072 bstp_set_port_state(bp, 1073 BSTP_IFSTATE_FORWARDING); 1074 bp->bp_agreed = bp->bp_protover; 1075 } else if (bp->bp_state == BSTP_IFSTATE_DISCARDING) 1076 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 1077 } 1078 1079 if (((bp->bp_sync && !bp->bp_synced) || 1080 (bp->bp_reroot && bp->bp_recent_root_timer.active) || 1081 (bp->bp_flags & BSTP_PORT_DISPUTED)) && !bp->bp_operedge && 1082 bp->bp_state != BSTP_IFSTATE_DISCARDING) { 1083 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1084 bp->bp_flags &= ~BSTP_PORT_DISPUTED; 1085 bstp_timer_start(&bp->bp_forward_delay_timer, 1086 bp->bp_protover == BSTP_PROTO_RSTP ? 1087 bp->bp_desg_htime : bp->bp_desg_fdelay); 1088 DPRINTF("%s -> DESIGNATED_DISCARD\n", 1089 bp->bp_ifp->if_xname); 1090 } 1091 break; 1092 } 1093 1094 if (bp->bp_flags & BSTP_PORT_NEWINFO) 1095 bstp_transmit(bs, bp); 1096 } 1097 1098 static void 1099 bstp_update_tc(struct bstp_port *bp) 1100 { 1101 switch (bp->bp_tcstate) { 1102 case BSTP_TCSTATE_ACTIVE: 1103 if ((bp->bp_role != BSTP_ROLE_DESIGNATED && 1104 bp->bp_role != BSTP_ROLE_ROOT) || bp->bp_operedge) 1105 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1106 1107 if (bp->bp_rcvdtcn) 1108 bstp_set_port_tc(bp, BSTP_TCSTATE_TCN); 1109 if (bp->bp_rcvdtc) 1110 bstp_set_port_tc(bp, BSTP_TCSTATE_TC); 1111 1112 if (bp->bp_tc_prop && !bp->bp_operedge) 1113 bstp_set_port_tc(bp, BSTP_TCSTATE_PROPAG); 1114 1115 if (bp->bp_rcvdtca) 1116 bstp_set_port_tc(bp, BSTP_TCSTATE_ACK); 1117 break; 1118 1119 case BSTP_TCSTATE_INACTIVE: 1120 if ((bp->bp_state == BSTP_IFSTATE_LEARNING || 1121 bp->bp_state == BSTP_IFSTATE_FORWARDING) && 1122 bp->bp_fdbflush == 0) 1123 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1124 break; 1125 1126 case BSTP_TCSTATE_LEARNING: 1127 if (bp->bp_rcvdtc || bp->bp_rcvdtcn || bp->bp_rcvdtca || 1128 bp->bp_tc_prop) 1129 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1130 else if (bp->bp_role != BSTP_ROLE_DESIGNATED && 1131 bp->bp_role != BSTP_ROLE_ROOT && 1132 bp->bp_state == BSTP_IFSTATE_DISCARDING) 1133 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1134 1135 if ((bp->bp_role == BSTP_ROLE_DESIGNATED || 1136 bp->bp_role == BSTP_ROLE_ROOT) && 1137 bp->bp_state == BSTP_IFSTATE_FORWARDING && 1138 !bp->bp_operedge) 1139 bstp_set_port_tc(bp, BSTP_TCSTATE_DETECTED); 1140 break; 1141 1142 /* these are transient states and go straight back to ACTIVE */ 1143 case BSTP_TCSTATE_DETECTED: 1144 case BSTP_TCSTATE_TCN: 1145 case BSTP_TCSTATE_TC: 1146 case BSTP_TCSTATE_PROPAG: 1147 case BSTP_TCSTATE_ACK: 1148 DPRINTF("Invalid TC state for %s\n", 1149 bp->bp_ifp->if_xname); 1150 break; 1151 } 1152 1153 } 1154 1155 static void 1156 bstp_update_info(struct bstp_port *bp) 1157 { 1158 struct bstp_state *bs = bp->bp_bs; 1159 1160 bp->bp_proposing = 0; 1161 bp->bp_proposed = 0; 1162 1163 if (bp->bp_agreed && !bstp_pdu_bettersame(bp, BSTP_INFO_MINE)) 1164 bp->bp_agreed = 0; 1165 1166 if (bp->bp_synced && !bp->bp_agreed) { 1167 bp->bp_synced = 0; 1168 bs->bs_allsynced = 0; 1169 } 1170 1171 /* copy the designated pv to the port */ 1172 bp->bp_port_pv = bp->bp_desg_pv; 1173 bp->bp_port_msg_age = bp->bp_desg_msg_age; 1174 bp->bp_port_max_age = bp->bp_desg_max_age; 1175 bp->bp_port_fdelay = bp->bp_desg_fdelay; 1176 bp->bp_port_htime = bp->bp_desg_htime; 1177 bp->bp_infois = BSTP_INFO_MINE; 1178 1179 /* Set transmit flag but do not immediately send */ 1180 bp->bp_flags |= BSTP_PORT_NEWINFO; 1181 } 1182 1183 /* set tcprop on every port other than the caller */ 1184 static void 1185 bstp_set_other_tcprop(struct bstp_port *bp) 1186 { 1187 struct bstp_state *bs = bp->bp_bs; 1188 struct bstp_port *bp2; 1189 1190 BSTP_LOCK_ASSERT(bs); 1191 1192 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1193 if (bp2 == bp) 1194 continue; 1195 bp2->bp_tc_prop = 1; 1196 } 1197 } 1198 1199 static void 1200 bstp_set_all_reroot(struct bstp_state *bs) 1201 { 1202 struct bstp_port *bp; 1203 1204 BSTP_LOCK_ASSERT(bs); 1205 1206 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1207 bp->bp_reroot = 1; 1208 } 1209 1210 static void 1211 bstp_set_all_sync(struct bstp_state *bs) 1212 { 1213 struct bstp_port *bp; 1214 1215 BSTP_LOCK_ASSERT(bs); 1216 1217 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1218 bp->bp_sync = 1; 1219 bp->bp_synced = 0; /* Not explicit in spec */ 1220 } 1221 1222 bs->bs_allsynced = 0; 1223 } 1224 1225 static void 1226 bstp_set_port_state(struct bstp_port *bp, int state) 1227 { 1228 if (bp->bp_state == state) 1229 return; 1230 1231 bp->bp_state = state; 1232 1233 switch (bp->bp_state) { 1234 case BSTP_IFSTATE_DISCARDING: 1235 DPRINTF("state changed to DISCARDING on %s\n", 1236 bp->bp_ifp->if_xname); 1237 break; 1238 1239 case BSTP_IFSTATE_LEARNING: 1240 DPRINTF("state changed to LEARNING on %s\n", 1241 bp->bp_ifp->if_xname); 1242 1243 bstp_timer_start(&bp->bp_forward_delay_timer, 1244 bp->bp_protover == BSTP_PROTO_RSTP ? 1245 bp->bp_desg_htime : bp->bp_desg_fdelay); 1246 break; 1247 1248 case BSTP_IFSTATE_FORWARDING: 1249 DPRINTF("state changed to FORWARDING on %s\n", 1250 bp->bp_ifp->if_xname); 1251 1252 bstp_timer_stop(&bp->bp_forward_delay_timer); 1253 /* Record that we enabled forwarding */ 1254 bp->bp_forward_transitions++; 1255 break; 1256 } 1257 1258 /* notify the parent bridge */ 1259 taskqueue_enqueue(taskqueue_swi, &bp->bp_statetask); 1260 } 1261 1262 static void 1263 bstp_set_port_role(struct bstp_port *bp, int role) 1264 { 1265 struct bstp_state *bs = bp->bp_bs; 1266 1267 if (bp->bp_role == role) 1268 return; 1269 1270 /* perform pre-change tasks */ 1271 switch (bp->bp_role) { 1272 case BSTP_ROLE_DISABLED: 1273 bstp_timer_start(&bp->bp_forward_delay_timer, 1274 bp->bp_desg_max_age); 1275 break; 1276 1277 case BSTP_ROLE_BACKUP: 1278 bstp_timer_start(&bp->bp_recent_backup_timer, 1279 bp->bp_desg_htime * 2); 1280 /* fall through */ 1281 case BSTP_ROLE_ALTERNATE: 1282 bstp_timer_start(&bp->bp_forward_delay_timer, 1283 bp->bp_desg_fdelay); 1284 bp->bp_sync = 0; 1285 bp->bp_synced = 1; 1286 bp->bp_reroot = 0; 1287 break; 1288 1289 case BSTP_ROLE_ROOT: 1290 bstp_timer_start(&bp->bp_recent_root_timer, 1291 BSTP_DEFAULT_FORWARD_DELAY); 1292 break; 1293 } 1294 1295 bp->bp_role = role; 1296 /* clear values not carried between roles */ 1297 bp->bp_proposing = 0; 1298 bs->bs_allsynced = 0; 1299 1300 /* initialise the new role */ 1301 switch (bp->bp_role) { 1302 case BSTP_ROLE_DISABLED: 1303 case BSTP_ROLE_ALTERNATE: 1304 case BSTP_ROLE_BACKUP: 1305 DPRINTF("%s role -> ALT/BACK/DISABLED\n", 1306 bp->bp_ifp->if_xname); 1307 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1308 bstp_timer_stop(&bp->bp_recent_root_timer); 1309 bstp_timer_latch(&bp->bp_forward_delay_timer); 1310 bp->bp_sync = 0; 1311 bp->bp_synced = 1; 1312 bp->bp_reroot = 0; 1313 break; 1314 1315 case BSTP_ROLE_ROOT: 1316 DPRINTF("%s role -> ROOT\n", 1317 bp->bp_ifp->if_xname); 1318 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1319 bstp_timer_latch(&bp->bp_recent_root_timer); 1320 bp->bp_proposing = 0; 1321 break; 1322 1323 case BSTP_ROLE_DESIGNATED: 1324 DPRINTF("%s role -> DESIGNATED\n", 1325 bp->bp_ifp->if_xname); 1326 bstp_timer_start(&bp->bp_hello_timer, 1327 bp->bp_desg_htime); 1328 bp->bp_agree = 0; 1329 break; 1330 } 1331 1332 /* let the TC state know that the role changed */ 1333 bstp_update_tc(bp); 1334 } 1335 1336 static void 1337 bstp_set_port_proto(struct bstp_port *bp, int proto) 1338 { 1339 struct bstp_state *bs = bp->bp_bs; 1340 1341 /* supported protocol versions */ 1342 switch (proto) { 1343 case BSTP_PROTO_STP: 1344 /* we can downgrade protocols only */ 1345 bstp_timer_stop(&bp->bp_migrate_delay_timer); 1346 /* clear unsupported features */ 1347 bp->bp_operedge = 0; 1348 /* STP compat mode only uses 16 bits of the 32 */ 1349 if (bp->bp_path_cost > 65535) 1350 bp->bp_path_cost = 65535; 1351 break; 1352 1353 case BSTP_PROTO_RSTP: 1354 bstp_timer_start(&bp->bp_migrate_delay_timer, 1355 bs->bs_migration_delay); 1356 break; 1357 1358 default: 1359 DPRINTF("Unsupported STP version %d\n", proto); 1360 return; 1361 } 1362 1363 bp->bp_protover = proto; 1364 bp->bp_flags &= ~BSTP_PORT_CANMIGRATE; 1365 } 1366 1367 static void 1368 bstp_set_port_tc(struct bstp_port *bp, int state) 1369 { 1370 struct bstp_state *bs = bp->bp_bs; 1371 1372 bp->bp_tcstate = state; 1373 1374 /* initialise the new state */ 1375 switch (bp->bp_tcstate) { 1376 case BSTP_TCSTATE_ACTIVE: 1377 DPRINTF("%s -> TC_ACTIVE\n", bp->bp_ifp->if_xname); 1378 /* nothing to do */ 1379 break; 1380 1381 case BSTP_TCSTATE_INACTIVE: 1382 bstp_timer_stop(&bp->bp_tc_timer); 1383 /* flush routes on the parent bridge */ 1384 bp->bp_fdbflush = 1; 1385 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask); 1386 bp->bp_tc_ack = 0; 1387 DPRINTF("%s -> TC_INACTIVE\n", bp->bp_ifp->if_xname); 1388 break; 1389 1390 case BSTP_TCSTATE_LEARNING: 1391 bp->bp_rcvdtc = 0; 1392 bp->bp_rcvdtcn = 0; 1393 bp->bp_rcvdtca = 0; 1394 bp->bp_tc_prop = 0; 1395 DPRINTF("%s -> TC_LEARNING\n", bp->bp_ifp->if_xname); 1396 break; 1397 1398 case BSTP_TCSTATE_DETECTED: 1399 bstp_set_timer_tc(bp); 1400 bstp_set_other_tcprop(bp); 1401 /* send out notification */ 1402 bp->bp_flags |= BSTP_PORT_NEWINFO; 1403 bstp_transmit(bs, bp); 1404 getmicrotime(&bs->bs_last_tc_time); 1405 DPRINTF("%s -> TC_DETECTED\n", bp->bp_ifp->if_xname); 1406 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1407 break; 1408 1409 case BSTP_TCSTATE_TCN: 1410 bstp_set_timer_tc(bp); 1411 DPRINTF("%s -> TC_TCN\n", bp->bp_ifp->if_xname); 1412 /* fall through */ 1413 case BSTP_TCSTATE_TC: 1414 bp->bp_rcvdtc = 0; 1415 bp->bp_rcvdtcn = 0; 1416 if (bp->bp_role == BSTP_ROLE_DESIGNATED) 1417 bp->bp_tc_ack = 1; 1418 1419 bstp_set_other_tcprop(bp); 1420 DPRINTF("%s -> TC_TC\n", bp->bp_ifp->if_xname); 1421 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1422 break; 1423 1424 case BSTP_TCSTATE_PROPAG: 1425 /* flush routes on the parent bridge */ 1426 bp->bp_fdbflush = 1; 1427 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask); 1428 bp->bp_tc_prop = 0; 1429 bstp_set_timer_tc(bp); 1430 DPRINTF("%s -> TC_PROPAG\n", bp->bp_ifp->if_xname); 1431 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1432 break; 1433 1434 case BSTP_TCSTATE_ACK: 1435 bstp_timer_stop(&bp->bp_tc_timer); 1436 bp->bp_rcvdtca = 0; 1437 DPRINTF("%s -> TC_ACK\n", bp->bp_ifp->if_xname); 1438 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1439 break; 1440 } 1441 } 1442 1443 static void 1444 bstp_set_timer_tc(struct bstp_port *bp) 1445 { 1446 struct bstp_state *bs = bp->bp_bs; 1447 1448 if (bp->bp_tc_timer.active) 1449 return; 1450 1451 switch (bp->bp_protover) { 1452 case BSTP_PROTO_RSTP: 1453 bstp_timer_start(&bp->bp_tc_timer, 1454 bp->bp_desg_htime + BSTP_TICK_VAL); 1455 bp->bp_flags |= BSTP_PORT_NEWINFO; 1456 break; 1457 1458 case BSTP_PROTO_STP: 1459 bstp_timer_start(&bp->bp_tc_timer, 1460 bs->bs_root_max_age + bs->bs_root_fdelay); 1461 break; 1462 } 1463 } 1464 1465 static void 1466 bstp_set_timer_msgage(struct bstp_port *bp) 1467 { 1468 if (bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR <= 1469 bp->bp_port_max_age) { 1470 bstp_timer_start(&bp->bp_message_age_timer, 1471 bp->bp_port_htime * 3); 1472 } else 1473 /* expires immediately */ 1474 bstp_timer_start(&bp->bp_message_age_timer, 0); 1475 } 1476 1477 static int 1478 bstp_rerooted(struct bstp_state *bs, struct bstp_port *bp) 1479 { 1480 struct bstp_port *bp2; 1481 int rr_set = 0; 1482 1483 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1484 if (bp2 == bp) 1485 continue; 1486 if (bp2->bp_recent_root_timer.active) { 1487 rr_set = 1; 1488 break; 1489 } 1490 } 1491 return (!rr_set); 1492 } 1493 1494 int 1495 bstp_set_htime(struct bstp_state *bs, int t) 1496 { 1497 /* convert seconds to ticks */ 1498 t *= BSTP_TICK_VAL; 1499 1500 /* value can only be changed in leagacy stp mode */ 1501 if (bs->bs_protover != BSTP_PROTO_STP) 1502 return (EPERM); 1503 1504 if (t < BSTP_MIN_HELLO_TIME || t > BSTP_MAX_HELLO_TIME) 1505 return (EINVAL); 1506 1507 BSTP_LOCK(bs); 1508 bs->bs_bridge_htime = t; 1509 bstp_reinit(bs); 1510 BSTP_UNLOCK(bs); 1511 return (0); 1512 } 1513 1514 int 1515 bstp_set_fdelay(struct bstp_state *bs, int t) 1516 { 1517 /* convert seconds to ticks */ 1518 t *= BSTP_TICK_VAL; 1519 1520 if (t < BSTP_MIN_FORWARD_DELAY || t > BSTP_MAX_FORWARD_DELAY) 1521 return (EINVAL); 1522 1523 BSTP_LOCK(bs); 1524 bs->bs_bridge_fdelay = t; 1525 bstp_reinit(bs); 1526 BSTP_UNLOCK(bs); 1527 return (0); 1528 } 1529 1530 int 1531 bstp_set_maxage(struct bstp_state *bs, int t) 1532 { 1533 /* convert seconds to ticks */ 1534 t *= BSTP_TICK_VAL; 1535 1536 if (t < BSTP_MIN_MAX_AGE || t > BSTP_MAX_MAX_AGE) 1537 return (EINVAL); 1538 1539 BSTP_LOCK(bs); 1540 bs->bs_bridge_max_age = t; 1541 bstp_reinit(bs); 1542 BSTP_UNLOCK(bs); 1543 return (0); 1544 } 1545 1546 int 1547 bstp_set_holdcount(struct bstp_state *bs, int count) 1548 { 1549 struct bstp_port *bp; 1550 1551 if (count < BSTP_MIN_HOLD_COUNT || 1552 count > BSTP_MAX_HOLD_COUNT) 1553 return (EINVAL); 1554 1555 BSTP_LOCK(bs); 1556 bs->bs_txholdcount = count; 1557 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1558 bp->bp_txcount = 0; 1559 BSTP_UNLOCK(bs); 1560 return (0); 1561 } 1562 1563 int 1564 bstp_set_protocol(struct bstp_state *bs, int proto) 1565 { 1566 struct bstp_port *bp; 1567 1568 switch (proto) { 1569 /* Supported protocol versions */ 1570 case BSTP_PROTO_STP: 1571 case BSTP_PROTO_RSTP: 1572 break; 1573 1574 default: 1575 return (EINVAL); 1576 } 1577 1578 BSTP_LOCK(bs); 1579 bs->bs_protover = proto; 1580 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 1581 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1582 /* reinit state */ 1583 bp->bp_infois = BSTP_INFO_DISABLED; 1584 bp->bp_txcount = 0; 1585 bstp_set_port_proto(bp, bs->bs_protover); 1586 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 1587 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1588 bstp_timer_stop(&bp->bp_recent_backup_timer); 1589 } 1590 bstp_reinit(bs); 1591 BSTP_UNLOCK(bs); 1592 return (0); 1593 } 1594 1595 int 1596 bstp_set_priority(struct bstp_state *bs, int pri) 1597 { 1598 if (pri < 0 || pri > BSTP_MAX_PRIORITY) 1599 return (EINVAL); 1600 1601 /* Limit to steps of 4096 */ 1602 pri -= pri % 4096; 1603 1604 BSTP_LOCK(bs); 1605 bs->bs_bridge_priority = pri; 1606 bstp_reinit(bs); 1607 BSTP_UNLOCK(bs); 1608 return (0); 1609 } 1610 1611 int 1612 bstp_set_port_priority(struct bstp_port *bp, int pri) 1613 { 1614 struct bstp_state *bs = bp->bp_bs; 1615 1616 if (pri < 0 || pri > BSTP_MAX_PORT_PRIORITY) 1617 return (EINVAL); 1618 1619 /* Limit to steps of 16 */ 1620 pri -= pri % 16; 1621 1622 BSTP_LOCK(bs); 1623 bp->bp_priority = pri; 1624 bstp_reinit(bs); 1625 BSTP_UNLOCK(bs); 1626 return (0); 1627 } 1628 1629 int 1630 bstp_set_path_cost(struct bstp_port *bp, uint32_t path_cost) 1631 { 1632 struct bstp_state *bs = bp->bp_bs; 1633 1634 if (path_cost > BSTP_MAX_PATH_COST) 1635 return (EINVAL); 1636 1637 /* STP compat mode only uses 16 bits of the 32 */ 1638 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1639 path_cost = 65535; 1640 1641 BSTP_LOCK(bs); 1642 1643 if (path_cost == 0) { /* use auto */ 1644 bp->bp_flags &= ~BSTP_PORT_ADMCOST; 1645 bp->bp_path_cost = bstp_calc_path_cost(bp); 1646 } else { 1647 bp->bp_path_cost = path_cost; 1648 bp->bp_flags |= BSTP_PORT_ADMCOST; 1649 } 1650 bstp_reinit(bs); 1651 BSTP_UNLOCK(bs); 1652 return (0); 1653 } 1654 1655 int 1656 bstp_set_edge(struct bstp_port *bp, int set) 1657 { 1658 struct bstp_state *bs = bp->bp_bs; 1659 1660 BSTP_LOCK(bs); 1661 if ((bp->bp_operedge = set) == 0) 1662 bp->bp_flags &= ~BSTP_PORT_ADMEDGE; 1663 else 1664 bp->bp_flags |= BSTP_PORT_ADMEDGE; 1665 BSTP_UNLOCK(bs); 1666 return (0); 1667 } 1668 1669 int 1670 bstp_set_autoedge(struct bstp_port *bp, int set) 1671 { 1672 struct bstp_state *bs = bp->bp_bs; 1673 1674 BSTP_LOCK(bs); 1675 if (set) { 1676 bp->bp_flags |= BSTP_PORT_AUTOEDGE; 1677 /* we may be able to transition straight to edge */ 1678 if (bp->bp_edge_delay_timer.active == 0) 1679 bstp_edge_delay_expiry(bs, bp); 1680 } else 1681 bp->bp_flags &= ~BSTP_PORT_AUTOEDGE; 1682 BSTP_UNLOCK(bs); 1683 return (0); 1684 } 1685 1686 int 1687 bstp_set_ptp(struct bstp_port *bp, int set) 1688 { 1689 struct bstp_state *bs = bp->bp_bs; 1690 1691 BSTP_LOCK(bs); 1692 bp->bp_ptp_link = set; 1693 BSTP_UNLOCK(bs); 1694 return (0); 1695 } 1696 1697 int 1698 bstp_set_autoptp(struct bstp_port *bp, int set) 1699 { 1700 struct bstp_state *bs = bp->bp_bs; 1701 1702 BSTP_LOCK(bs); 1703 if (set) { 1704 bp->bp_flags |= BSTP_PORT_AUTOPTP; 1705 if (bp->bp_role != BSTP_ROLE_DISABLED) 1706 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 1707 } else 1708 bp->bp_flags &= ~BSTP_PORT_AUTOPTP; 1709 BSTP_UNLOCK(bs); 1710 return (0); 1711 } 1712 1713 /* 1714 * Calculate the path cost according to the link speed. 1715 */ 1716 static uint32_t 1717 bstp_calc_path_cost(struct bstp_port *bp) 1718 { 1719 struct ifnet *ifp = bp->bp_ifp; 1720 uint32_t path_cost; 1721 1722 /* If the priority has been manually set then retain the value */ 1723 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1724 return bp->bp_path_cost; 1725 1726 if (ifp->if_link_state == LINK_STATE_DOWN) { 1727 /* Recalc when the link comes up again */ 1728 bp->bp_flags |= BSTP_PORT_PNDCOST; 1729 return (BSTP_DEFAULT_PATH_COST); 1730 } 1731 1732 if (ifp->if_baudrate < 1000) 1733 return (BSTP_DEFAULT_PATH_COST); 1734 1735 /* formula from section 17.14, IEEE Std 802.1D-2004 */ 1736 path_cost = 20000000000ULL / (ifp->if_baudrate / 1000); 1737 1738 if (path_cost > BSTP_MAX_PATH_COST) 1739 path_cost = BSTP_MAX_PATH_COST; 1740 1741 /* STP compat mode only uses 16 bits of the 32 */ 1742 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1743 path_cost = 65535; 1744 1745 return (path_cost); 1746 } 1747 1748 /* 1749 * Notify the bridge that a port state has changed, we need to do this from a 1750 * taskqueue to avoid a LOR. 1751 */ 1752 static void 1753 bstp_notify_state(void *arg, int pending) 1754 { 1755 struct bstp_port *bp = (struct bstp_port *)arg; 1756 struct bstp_state *bs = bp->bp_bs; 1757 1758 if (bp->bp_active == 1 && bs->bs_state_cb != NULL) 1759 (*bs->bs_state_cb)(bp->bp_ifp, bp->bp_state); 1760 } 1761 1762 /* 1763 * Flush the routes on the bridge port, we need to do this from a 1764 * taskqueue to avoid a LOR. 1765 */ 1766 static void 1767 bstp_notify_rtage(void *arg, int pending) 1768 { 1769 struct bstp_port *bp = (struct bstp_port *)arg; 1770 struct bstp_state *bs = bp->bp_bs; 1771 int age = 0; 1772 1773 BSTP_LOCK(bs); 1774 switch (bp->bp_protover) { 1775 case BSTP_PROTO_STP: 1776 /* convert to seconds */ 1777 age = bp->bp_desg_fdelay / BSTP_TICK_VAL; 1778 break; 1779 1780 case BSTP_PROTO_RSTP: 1781 age = 0; 1782 break; 1783 } 1784 BSTP_UNLOCK(bs); 1785 1786 if (bp->bp_active == 1 && bs->bs_rtage_cb != NULL) 1787 (*bs->bs_rtage_cb)(bp->bp_ifp, age); 1788 1789 /* flush is complete */ 1790 BSTP_LOCK(bs); 1791 bp->bp_fdbflush = 0; 1792 BSTP_UNLOCK(bs); 1793 } 1794 1795 void 1796 bstp_linkstate(struct bstp_port *bp) 1797 { 1798 struct bstp_state *bs = bp->bp_bs; 1799 1800 if (!bp->bp_active) 1801 return; 1802 1803 bstp_ifupdstatus(bp, 0); 1804 BSTP_LOCK(bs); 1805 bstp_update_state(bs, bp); 1806 BSTP_UNLOCK(bs); 1807 } 1808 1809 static void 1810 bstp_ifupdstatus(void *arg, int pending) 1811 { 1812 struct bstp_port *bp = (struct bstp_port *)arg; 1813 struct bstp_state *bs = bp->bp_bs; 1814 struct ifnet *ifp = bp->bp_ifp; 1815 struct ifmediareq ifmr; 1816 int error, changed; 1817 1818 if (!bp->bp_active) 1819 return; 1820 1821 bzero((char *)&ifmr, sizeof(ifmr)); 1822 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr); 1823 1824 BSTP_LOCK(bs); 1825 changed = 0; 1826 if ((error == 0) && (ifp->if_flags & IFF_UP)) { 1827 if (ifmr.ifm_status & IFM_ACTIVE) { 1828 /* A full-duplex link is assumed to be point to point */ 1829 if (bp->bp_flags & BSTP_PORT_AUTOPTP) { 1830 int fdx; 1831 1832 fdx = ifmr.ifm_active & IFM_FDX ? 1 : 0; 1833 if (bp->bp_ptp_link ^ fdx) { 1834 bp->bp_ptp_link = fdx; 1835 changed = 1; 1836 } 1837 } 1838 1839 /* Calc the cost if the link was down previously */ 1840 if (bp->bp_flags & BSTP_PORT_PNDCOST) { 1841 uint32_t cost; 1842 1843 cost = bstp_calc_path_cost(bp); 1844 if (bp->bp_path_cost != cost) { 1845 bp->bp_path_cost = cost; 1846 changed = 1; 1847 } 1848 bp->bp_flags &= ~BSTP_PORT_PNDCOST; 1849 } 1850 1851 if (bp->bp_role == BSTP_ROLE_DISABLED) { 1852 bstp_enable_port(bs, bp); 1853 changed = 1; 1854 } 1855 } else { 1856 if (bp->bp_role != BSTP_ROLE_DISABLED) { 1857 bstp_disable_port(bs, bp); 1858 changed = 1; 1859 if ((bp->bp_flags & BSTP_PORT_ADMEDGE) && 1860 bp->bp_protover == BSTP_PROTO_RSTP) 1861 bp->bp_operedge = 1; 1862 } 1863 } 1864 } else if (bp->bp_infois != BSTP_INFO_DISABLED) { 1865 bstp_disable_port(bs, bp); 1866 changed = 1; 1867 } 1868 if (changed) 1869 bstp_assign_roles(bs); 1870 BSTP_UNLOCK(bs); 1871 } 1872 1873 static void 1874 bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp) 1875 { 1876 bp->bp_infois = BSTP_INFO_AGED; 1877 } 1878 1879 static void 1880 bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp) 1881 { 1882 bp->bp_infois = BSTP_INFO_DISABLED; 1883 } 1884 1885 static void 1886 bstp_tick(void *arg) 1887 { 1888 struct epoch_tracker et; 1889 struct bstp_state *bs = arg; 1890 struct bstp_port *bp; 1891 1892 BSTP_LOCK_ASSERT(bs); 1893 1894 if (bs->bs_running == 0) 1895 return; 1896 1897 NET_EPOCH_ENTER(et); 1898 CURVNET_SET(bs->bs_vnet); 1899 1900 /* poll link events on interfaces that do not support linkstate */ 1901 if (bstp_timer_dectest(&bs->bs_link_timer)) { 1902 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1903 if (!(bp->bp_ifp->if_capabilities & IFCAP_LINKSTATE)) 1904 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 1905 } 1906 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 1907 } 1908 1909 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1910 /* no events need to happen for these */ 1911 bstp_timer_dectest(&bp->bp_tc_timer); 1912 bstp_timer_dectest(&bp->bp_recent_root_timer); 1913 bstp_timer_dectest(&bp->bp_forward_delay_timer); 1914 bstp_timer_dectest(&bp->bp_recent_backup_timer); 1915 1916 if (bstp_timer_dectest(&bp->bp_hello_timer)) 1917 bstp_hello_timer_expiry(bs, bp); 1918 1919 if (bstp_timer_dectest(&bp->bp_message_age_timer)) 1920 bstp_message_age_expiry(bs, bp); 1921 1922 if (bstp_timer_dectest(&bp->bp_migrate_delay_timer)) 1923 bstp_migrate_delay_expiry(bs, bp); 1924 1925 if (bstp_timer_dectest(&bp->bp_edge_delay_timer)) 1926 bstp_edge_delay_expiry(bs, bp); 1927 1928 /* update the various state machines for the port */ 1929 bstp_update_state(bs, bp); 1930 1931 if (bp->bp_txcount > 0) 1932 bp->bp_txcount--; 1933 } 1934 1935 CURVNET_RESTORE(); 1936 NET_EPOCH_EXIT(et); 1937 1938 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 1939 } 1940 1941 static void 1942 bstp_timer_start(struct bstp_timer *t, uint16_t v) 1943 { 1944 t->value = v; 1945 t->active = 1; 1946 t->latched = 0; 1947 } 1948 1949 static void 1950 bstp_timer_stop(struct bstp_timer *t) 1951 { 1952 t->value = 0; 1953 t->active = 0; 1954 t->latched = 0; 1955 } 1956 1957 static void 1958 bstp_timer_latch(struct bstp_timer *t) 1959 { 1960 t->latched = 1; 1961 t->active = 1; 1962 } 1963 1964 static int 1965 bstp_timer_dectest(struct bstp_timer *t) 1966 { 1967 if (t->active == 0 || t->latched) 1968 return (0); 1969 t->value -= BSTP_TICK_VAL; 1970 if (t->value <= 0) { 1971 bstp_timer_stop(t); 1972 return (1); 1973 } 1974 return (0); 1975 } 1976 1977 static void 1978 bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp) 1979 { 1980 if ((bp->bp_flags & BSTP_PORT_NEWINFO) || 1981 bp->bp_role == BSTP_ROLE_DESIGNATED || 1982 (bp->bp_role == BSTP_ROLE_ROOT && 1983 bp->bp_tc_timer.active == 1)) { 1984 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 1985 bp->bp_flags |= BSTP_PORT_NEWINFO; 1986 bstp_transmit(bs, bp); 1987 } 1988 } 1989 1990 static void 1991 bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp) 1992 { 1993 if (bp->bp_infois == BSTP_INFO_RECEIVED) { 1994 bp->bp_infois = BSTP_INFO_AGED; 1995 bstp_assign_roles(bs); 1996 DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname); 1997 } 1998 } 1999 2000 static void 2001 bstp_migrate_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 2002 { 2003 bp->bp_flags |= BSTP_PORT_CANMIGRATE; 2004 } 2005 2006 static void 2007 bstp_edge_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 2008 { 2009 if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) && 2010 bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing && 2011 bp->bp_role == BSTP_ROLE_DESIGNATED) { 2012 bp->bp_operedge = 1; 2013 DPRINTF("%s -> edge port\n", bp->bp_ifp->if_xname); 2014 } 2015 } 2016 2017 static int 2018 bstp_addr_cmp(const uint8_t *a, const uint8_t *b) 2019 { 2020 int i, d; 2021 2022 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2023 d = ((int)a[i]) - ((int)b[i]); 2024 } 2025 2026 return (d); 2027 } 2028 2029 /* 2030 * compare the bridge address component of the bridgeid 2031 */ 2032 static int 2033 bstp_same_bridgeid(uint64_t id1, uint64_t id2) 2034 { 2035 u_char addr1[ETHER_ADDR_LEN]; 2036 u_char addr2[ETHER_ADDR_LEN]; 2037 2038 PV2ADDR(id1, addr1); 2039 PV2ADDR(id2, addr2); 2040 2041 if (bstp_addr_cmp(addr1, addr2) == 0) 2042 return (1); 2043 2044 return (0); 2045 } 2046 2047 void 2048 bstp_reinit(struct bstp_state *bs) 2049 { 2050 struct epoch_tracker et; 2051 struct bstp_port *bp; 2052 struct ifnet *ifp, *mif; 2053 u_char *e_addr; 2054 void *bridgeptr; 2055 static const u_char llzero[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 2056 2057 BSTP_LOCK_ASSERT(bs); 2058 2059 if (LIST_EMPTY(&bs->bs_bplist)) 2060 goto disablestp; 2061 2062 mif = NULL; 2063 bridgeptr = LIST_FIRST(&bs->bs_bplist)->bp_ifp->if_bridge; 2064 KASSERT(bridgeptr != NULL, ("Invalid bridge pointer")); 2065 /* 2066 * Search through the Ethernet adapters and find the one with the 2067 * lowest value. Make sure the adapter which we take the MAC address 2068 * from is part of this bridge, so we can have more than one independent 2069 * bridges in the same STP domain. 2070 */ 2071 NET_EPOCH_ENTER(et); 2072 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2073 if (ifp->if_type != IFT_ETHER && ifp->if_type != IFT_L2VLAN) 2074 continue; /* Not Ethernet */ 2075 2076 if (ifp->if_bridge != bridgeptr) 2077 continue; /* Not part of our bridge */ 2078 2079 if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0) 2080 continue; /* No mac address set */ 2081 2082 if (mif == NULL) { 2083 mif = ifp; 2084 continue; 2085 } 2086 if (bstp_addr_cmp(IF_LLADDR(ifp), IF_LLADDR(mif)) < 0) { 2087 mif = ifp; 2088 continue; 2089 } 2090 } 2091 NET_EPOCH_EXIT(et); 2092 if (mif == NULL) 2093 goto disablestp; 2094 2095 e_addr = IF_LLADDR(mif); 2096 bs->bs_bridge_pv.pv_dbridge_id = 2097 (((uint64_t)bs->bs_bridge_priority) << 48) | 2098 (((uint64_t)e_addr[0]) << 40) | 2099 (((uint64_t)e_addr[1]) << 32) | 2100 (((uint64_t)e_addr[2]) << 24) | 2101 (((uint64_t)e_addr[3]) << 16) | 2102 (((uint64_t)e_addr[4]) << 8) | 2103 (((uint64_t)e_addr[5])); 2104 2105 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2106 bs->bs_bridge_pv.pv_cost = 0; 2107 bs->bs_bridge_pv.pv_dport_id = 0; 2108 bs->bs_bridge_pv.pv_port_id = 0; 2109 2110 if (bs->bs_running && callout_pending(&bs->bs_bstpcallout) == 0) 2111 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2112 2113 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2114 bp->bp_port_id = (bp->bp_priority << 8) | 2115 (bp->bp_ifp->if_index & 0xfff); 2116 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 2117 } 2118 2119 bstp_assign_roles(bs); 2120 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 2121 return; 2122 2123 disablestp: 2124 /* Set the bridge and root id (lower bits) to zero */ 2125 bs->bs_bridge_pv.pv_dbridge_id = 2126 ((uint64_t)bs->bs_bridge_priority) << 48; 2127 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2128 bs->bs_root_pv = bs->bs_bridge_pv; 2129 /* Disable any remaining ports, they will have no MAC address */ 2130 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2131 bp->bp_infois = BSTP_INFO_DISABLED; 2132 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2133 } 2134 callout_stop(&bs->bs_bstpcallout); 2135 } 2136 2137 static int 2138 bstp_modevent(module_t mod, int type, void *data) 2139 { 2140 switch (type) { 2141 case MOD_LOAD: 2142 mtx_init(&bstp_list_mtx, "bridgestp list", NULL, MTX_DEF); 2143 LIST_INIT(&bstp_list); 2144 break; 2145 case MOD_UNLOAD: 2146 mtx_destroy(&bstp_list_mtx); 2147 break; 2148 default: 2149 return (EOPNOTSUPP); 2150 } 2151 return (0); 2152 } 2153 2154 static moduledata_t bstp_mod = { 2155 "bridgestp", 2156 bstp_modevent, 2157 0 2158 }; 2159 2160 DECLARE_MODULE(bridgestp, bstp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2161 MODULE_VERSION(bridgestp, 1); 2162 2163 void 2164 bstp_attach(struct bstp_state *bs, struct bstp_cb_ops *cb) 2165 { 2166 BSTP_LOCK_INIT(bs); 2167 callout_init_mtx(&bs->bs_bstpcallout, &bs->bs_mtx, 0); 2168 LIST_INIT(&bs->bs_bplist); 2169 2170 bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 2171 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 2172 bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY; 2173 bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 2174 bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME; 2175 bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY; 2176 bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT; 2177 bs->bs_protover = BSTP_PROTO_RSTP; 2178 bs->bs_state_cb = cb->bcb_state; 2179 bs->bs_rtage_cb = cb->bcb_rtage; 2180 bs->bs_vnet = curvnet; 2181 2182 getmicrotime(&bs->bs_last_tc_time); 2183 2184 mtx_lock(&bstp_list_mtx); 2185 LIST_INSERT_HEAD(&bstp_list, bs, bs_list); 2186 mtx_unlock(&bstp_list_mtx); 2187 } 2188 2189 void 2190 bstp_detach(struct bstp_state *bs) 2191 { 2192 KASSERT(LIST_EMPTY(&bs->bs_bplist), ("bstp still active")); 2193 2194 mtx_lock(&bstp_list_mtx); 2195 LIST_REMOVE(bs, bs_list); 2196 mtx_unlock(&bstp_list_mtx); 2197 callout_drain(&bs->bs_bstpcallout); 2198 BSTP_LOCK_DESTROY(bs); 2199 } 2200 2201 void 2202 bstp_init(struct bstp_state *bs) 2203 { 2204 BSTP_LOCK(bs); 2205 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2206 bs->bs_running = 1; 2207 bstp_reinit(bs); 2208 BSTP_UNLOCK(bs); 2209 } 2210 2211 void 2212 bstp_stop(struct bstp_state *bs) 2213 { 2214 struct bstp_port *bp; 2215 2216 BSTP_LOCK(bs); 2217 2218 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 2219 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2220 2221 bs->bs_running = 0; 2222 callout_stop(&bs->bs_bstpcallout); 2223 BSTP_UNLOCK(bs); 2224 } 2225 2226 int 2227 bstp_create(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *ifp) 2228 { 2229 bzero(bp, sizeof(struct bstp_port)); 2230 2231 BSTP_LOCK(bs); 2232 bp->bp_ifp = ifp; 2233 bp->bp_bs = bs; 2234 bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY; 2235 TASK_INIT(&bp->bp_statetask, 0, bstp_notify_state, bp); 2236 TASK_INIT(&bp->bp_rtagetask, 0, bstp_notify_rtage, bp); 2237 TASK_INIT(&bp->bp_mediatask, 0, bstp_ifupdstatus, bp); 2238 2239 /* Init state */ 2240 bp->bp_infois = BSTP_INFO_DISABLED; 2241 bp->bp_flags = BSTP_PORT_AUTOEDGE|BSTP_PORT_AUTOPTP; 2242 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2243 bstp_set_port_proto(bp, bs->bs_protover); 2244 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2245 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 2246 bp->bp_path_cost = bstp_calc_path_cost(bp); 2247 BSTP_UNLOCK(bs); 2248 return (0); 2249 } 2250 2251 int 2252 bstp_enable(struct bstp_port *bp) 2253 { 2254 struct bstp_state *bs = bp->bp_bs; 2255 struct ifnet *ifp = bp->bp_ifp; 2256 2257 KASSERT(bp->bp_active == 0, ("already a bstp member")); 2258 NET_EPOCH_ASSERT(); /* Because bstp_update_roles() causes traffic. */ 2259 2260 switch (ifp->if_type) { 2261 case IFT_ETHER: /* These can do spanning tree. */ 2262 case IFT_L2VLAN: 2263 break; 2264 default: 2265 /* Nothing else can. */ 2266 return (EINVAL); 2267 } 2268 2269 BSTP_LOCK(bs); 2270 LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next); 2271 bp->bp_active = 1; 2272 bp->bp_flags |= BSTP_PORT_NEWINFO; 2273 bstp_reinit(bs); 2274 bstp_update_roles(bs, bp); 2275 BSTP_UNLOCK(bs); 2276 return (0); 2277 } 2278 2279 void 2280 bstp_disable(struct bstp_port *bp) 2281 { 2282 struct bstp_state *bs = bp->bp_bs; 2283 2284 KASSERT(bp->bp_active == 1, ("not a bstp member")); 2285 2286 BSTP_LOCK(bs); 2287 bstp_disable_port(bs, bp); 2288 LIST_REMOVE(bp, bp_next); 2289 bp->bp_active = 0; 2290 bstp_reinit(bs); 2291 BSTP_UNLOCK(bs); 2292 } 2293 2294 /* 2295 * The bstp_port structure is about to be freed by the parent bridge. 2296 */ 2297 void 2298 bstp_destroy(struct bstp_port *bp) 2299 { 2300 KASSERT(bp->bp_active == 0, ("port is still attached")); 2301 taskqueue_drain(taskqueue_swi, &bp->bp_statetask); 2302 taskqueue_drain(taskqueue_swi, &bp->bp_rtagetask); 2303 taskqueue_drain(taskqueue_swi, &bp->bp_mediatask); 2304 2305 if (bp->bp_bs->bs_root_port == bp) 2306 bstp_assign_roles(bp->bp_bs); 2307 } 2308