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 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/mbuf.h> 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/kernel.h> 46 #include <sys/malloc.h> 47 #include <sys/callout.h> 48 #include <sys/module.h> 49 #include <sys/proc.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/taskqueue.h> 53 54 #include <net/if.h> 55 #include <net/if_var.h> 56 #include <net/if_private.h> 57 #include <net/if_dl.h> 58 #include <net/if_types.h> 59 #include <net/if_llc.h> 60 #include <net/if_media.h> 61 #include <net/vnet.h> 62 63 #include <netinet/in.h> 64 #include <netinet/in_systm.h> 65 #include <netinet/in_var.h> 66 #include <netinet/if_ether.h> 67 #include <net/bridgestp.h> 68 69 #ifdef BRIDGESTP_DEBUG 70 #define DPRINTF(fmt, arg...) printf("bstp: " fmt, ##arg) 71 #else 72 #define DPRINTF(fmt, arg...) (void)0 73 #endif 74 75 #define PV2ADDR(pv, eaddr) do { \ 76 eaddr[0] = pv >> 40; \ 77 eaddr[1] = pv >> 32; \ 78 eaddr[2] = pv >> 24; \ 79 eaddr[3] = pv >> 16; \ 80 eaddr[4] = pv >> 8; \ 81 eaddr[5] = pv >> 0; \ 82 } while (0) 83 84 #define INFO_BETTER 1 85 #define INFO_SAME 0 86 #define INFO_WORSE -1 87 88 const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; 89 90 LIST_HEAD(, bstp_state) bstp_list; 91 static struct mtx bstp_list_mtx; 92 93 static void bstp_transmit(struct bstp_state *, struct bstp_port *); 94 static void bstp_transmit_bpdu(struct bstp_state *, struct bstp_port *); 95 static void bstp_transmit_tcn(struct bstp_state *, struct bstp_port *); 96 static void bstp_decode_bpdu(struct bstp_port *, struct bstp_cbpdu *, 97 struct bstp_config_unit *); 98 static void bstp_send_bpdu(struct bstp_state *, struct bstp_port *, 99 struct bstp_cbpdu *); 100 static int bstp_pdu_flags(struct bstp_port *); 101 static void bstp_received_stp(struct bstp_state *, struct bstp_port *, 102 struct mbuf **, struct bstp_tbpdu *); 103 static void bstp_received_rstp(struct bstp_state *, struct bstp_port *, 104 struct mbuf **, struct bstp_tbpdu *); 105 static void bstp_received_tcn(struct bstp_state *, struct bstp_port *, 106 struct bstp_tcn_unit *); 107 static void bstp_received_bpdu(struct bstp_state *, struct bstp_port *, 108 struct bstp_config_unit *); 109 static int bstp_pdu_rcvtype(struct bstp_port *, struct bstp_config_unit *); 110 static int bstp_pdu_bettersame(struct bstp_port *, int); 111 static int bstp_info_cmp(struct bstp_pri_vector *, 112 struct bstp_pri_vector *); 113 static int bstp_info_superior(struct bstp_pri_vector *, 114 struct bstp_pri_vector *); 115 static void bstp_assign_roles(struct bstp_state *); 116 static void bstp_update_roles(struct bstp_state *, struct bstp_port *); 117 static void bstp_update_state(struct bstp_state *, struct bstp_port *); 118 static void bstp_update_tc(struct bstp_port *); 119 static void bstp_update_info(struct bstp_port *); 120 static void bstp_set_other_tcprop(struct bstp_port *); 121 static void bstp_set_all_reroot(struct bstp_state *); 122 static void bstp_set_all_sync(struct bstp_state *); 123 static void bstp_set_port_state(struct bstp_port *, int); 124 static void bstp_set_port_role(struct bstp_port *, int); 125 static void bstp_set_port_proto(struct bstp_port *, int); 126 static void bstp_set_port_tc(struct bstp_port *, int); 127 static void bstp_set_timer_tc(struct bstp_port *); 128 static void bstp_set_timer_msgage(struct bstp_port *); 129 static int bstp_rerooted(struct bstp_state *, struct bstp_port *); 130 static uint32_t bstp_calc_path_cost(struct bstp_port *); 131 static void bstp_notify_state(void *, int); 132 static void bstp_notify_rtage(void *, int); 133 static void bstp_ifupdstatus(void *, int); 134 static void bstp_enable_port(struct bstp_state *, struct bstp_port *); 135 static void bstp_disable_port(struct bstp_state *, struct bstp_port *); 136 static void bstp_tick(void *); 137 static void bstp_timer_start(struct bstp_timer *, uint16_t); 138 static void bstp_timer_stop(struct bstp_timer *); 139 static void bstp_timer_latch(struct bstp_timer *); 140 static int bstp_timer_dectest(struct bstp_timer *); 141 static void bstp_hello_timer_expiry(struct bstp_state *, 142 struct bstp_port *); 143 static void bstp_message_age_expiry(struct bstp_state *, 144 struct bstp_port *); 145 static void bstp_migrate_delay_expiry(struct bstp_state *, 146 struct bstp_port *); 147 static void bstp_edge_delay_expiry(struct bstp_state *, 148 struct bstp_port *); 149 static int bstp_addr_cmp(const uint8_t *, const uint8_t *); 150 static int bstp_same_bridgeid(uint64_t, uint64_t); 151 static void bstp_reinit(struct bstp_state *); 152 153 static void 154 bstp_transmit(struct bstp_state *bs, struct bstp_port *bp) 155 { 156 NET_EPOCH_ASSERT(); 157 158 if (bs->bs_running == 0) 159 return; 160 161 /* 162 * a PDU can only be sent if we have tx quota left and the 163 * hello timer is running. 164 */ 165 if (bp->bp_hello_timer.active == 0) { 166 /* Test if it needs to be reset */ 167 bstp_hello_timer_expiry(bs, bp); 168 return; 169 } 170 if (bp->bp_txcount > bs->bs_txholdcount) 171 /* Ran out of karma */ 172 return; 173 174 if (bp->bp_protover == BSTP_PROTO_RSTP) { 175 bstp_transmit_bpdu(bs, bp); 176 bp->bp_tc_ack = 0; 177 } else { /* STP */ 178 switch (bp->bp_role) { 179 case BSTP_ROLE_DESIGNATED: 180 bstp_transmit_bpdu(bs, bp); 181 bp->bp_tc_ack = 0; 182 break; 183 184 case BSTP_ROLE_ROOT: 185 bstp_transmit_tcn(bs, bp); 186 break; 187 } 188 } 189 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 190 bp->bp_flags &= ~BSTP_PORT_NEWINFO; 191 } 192 193 static void 194 bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp) 195 { 196 struct bstp_cbpdu bpdu; 197 198 BSTP_LOCK_ASSERT(bs); 199 200 bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48); 201 PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr); 202 203 bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost); 204 205 bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48); 206 PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr); 207 208 bpdu.cbu_portid = htons(bp->bp_port_id); 209 bpdu.cbu_messageage = htons(bp->bp_desg_msg_age); 210 bpdu.cbu_maxage = htons(bp->bp_desg_max_age); 211 bpdu.cbu_hellotime = htons(bp->bp_desg_htime); 212 bpdu.cbu_forwarddelay = htons(bp->bp_desg_fdelay); 213 214 bpdu.cbu_flags = bstp_pdu_flags(bp); 215 216 switch (bp->bp_protover) { 217 case BSTP_PROTO_STP: 218 bpdu.cbu_bpdutype = BSTP_MSGTYPE_CFG; 219 break; 220 221 case BSTP_PROTO_RSTP: 222 bpdu.cbu_bpdutype = BSTP_MSGTYPE_RSTP; 223 break; 224 } 225 226 bstp_send_bpdu(bs, bp, &bpdu); 227 } 228 229 static void 230 bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp) 231 { 232 struct bstp_tbpdu bpdu; 233 struct ifnet *ifp = bp->bp_ifp; 234 struct ether_header *eh; 235 struct mbuf *m; 236 237 KASSERT(bp == bs->bs_root_port, ("%s: bad root port\n", __func__)); 238 239 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 240 return; 241 242 m = m_gethdr(M_NOWAIT, MT_DATA); 243 if (m == NULL) 244 return; 245 246 m->m_pkthdr.rcvif = ifp; 247 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); 248 m->m_len = m->m_pkthdr.len; 249 250 eh = mtod(m, struct ether_header *); 251 252 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); 253 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 254 eh->ether_type = htons(sizeof(bpdu)); 255 256 bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP; 257 bpdu.tbu_ctl = LLC_UI; 258 bpdu.tbu_protoid = 0; 259 bpdu.tbu_protover = 0; 260 bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN; 261 262 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu)); 263 264 bp->bp_txcount++; 265 ifp->if_transmit(ifp, m); 266 } 267 268 static void 269 bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu, 270 struct bstp_config_unit *cu) 271 { 272 int flags; 273 274 cu->cu_pv.pv_root_id = 275 (((uint64_t)ntohs(cpdu->cbu_rootpri)) << 48) | 276 (((uint64_t)cpdu->cbu_rootaddr[0]) << 40) | 277 (((uint64_t)cpdu->cbu_rootaddr[1]) << 32) | 278 (((uint64_t)cpdu->cbu_rootaddr[2]) << 24) | 279 (((uint64_t)cpdu->cbu_rootaddr[3]) << 16) | 280 (((uint64_t)cpdu->cbu_rootaddr[4]) << 8) | 281 (((uint64_t)cpdu->cbu_rootaddr[5]) << 0); 282 283 cu->cu_pv.pv_dbridge_id = 284 (((uint64_t)ntohs(cpdu->cbu_bridgepri)) << 48) | 285 (((uint64_t)cpdu->cbu_bridgeaddr[0]) << 40) | 286 (((uint64_t)cpdu->cbu_bridgeaddr[1]) << 32) | 287 (((uint64_t)cpdu->cbu_bridgeaddr[2]) << 24) | 288 (((uint64_t)cpdu->cbu_bridgeaddr[3]) << 16) | 289 (((uint64_t)cpdu->cbu_bridgeaddr[4]) << 8) | 290 (((uint64_t)cpdu->cbu_bridgeaddr[5]) << 0); 291 292 cu->cu_pv.pv_cost = ntohl(cpdu->cbu_rootpathcost); 293 cu->cu_message_age = ntohs(cpdu->cbu_messageage); 294 cu->cu_max_age = ntohs(cpdu->cbu_maxage); 295 cu->cu_hello_time = ntohs(cpdu->cbu_hellotime); 296 cu->cu_forward_delay = ntohs(cpdu->cbu_forwarddelay); 297 cu->cu_pv.pv_dport_id = ntohs(cpdu->cbu_portid); 298 cu->cu_pv.pv_port_id = bp->bp_port_id; 299 cu->cu_message_type = cpdu->cbu_bpdutype; 300 301 /* Strip off unused flags in STP mode */ 302 flags = cpdu->cbu_flags; 303 switch (cpdu->cbu_protover) { 304 case BSTP_PROTO_STP: 305 flags &= BSTP_PDU_STPMASK; 306 /* A STP BPDU explicitly conveys a Designated Port */ 307 cu->cu_role = BSTP_ROLE_DESIGNATED; 308 break; 309 310 case BSTP_PROTO_RSTP: 311 flags &= BSTP_PDU_RSTPMASK; 312 break; 313 } 314 315 cu->cu_topology_change_ack = 316 (flags & BSTP_PDU_F_TCA) ? 1 : 0; 317 cu->cu_proposal = 318 (flags & BSTP_PDU_F_P) ? 1 : 0; 319 cu->cu_agree = 320 (flags & BSTP_PDU_F_A) ? 1 : 0; 321 cu->cu_learning = 322 (flags & BSTP_PDU_F_L) ? 1 : 0; 323 cu->cu_forwarding = 324 (flags & BSTP_PDU_F_F) ? 1 : 0; 325 cu->cu_topology_change = 326 (flags & BSTP_PDU_F_TC) ? 1 : 0; 327 328 switch ((flags & BSTP_PDU_PRMASK) >> BSTP_PDU_PRSHIFT) { 329 case BSTP_PDU_F_ROOT: 330 cu->cu_role = BSTP_ROLE_ROOT; 331 break; 332 case BSTP_PDU_F_ALT: 333 cu->cu_role = BSTP_ROLE_ALTERNATE; 334 break; 335 case BSTP_PDU_F_DESG: 336 cu->cu_role = BSTP_ROLE_DESIGNATED; 337 break; 338 } 339 } 340 341 static void 342 bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp, 343 struct bstp_cbpdu *bpdu) 344 { 345 struct ifnet *ifp; 346 struct mbuf *m; 347 struct ether_header *eh; 348 349 BSTP_LOCK_ASSERT(bs); 350 NET_EPOCH_ASSERT(); 351 352 ifp = bp->bp_ifp; 353 354 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 355 return; 356 357 m = m_gethdr(M_NOWAIT, MT_DATA); 358 if (m == NULL) 359 return; 360 361 eh = mtod(m, struct ether_header *); 362 363 bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP; 364 bpdu->cbu_ctl = LLC_UI; 365 bpdu->cbu_protoid = htons(BSTP_PROTO_ID); 366 367 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); 368 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 369 370 switch (bpdu->cbu_bpdutype) { 371 case BSTP_MSGTYPE_CFG: 372 bpdu->cbu_protover = BSTP_PROTO_STP; 373 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_STP_LEN; 374 eh->ether_type = htons(BSTP_BPDU_STP_LEN); 375 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, 376 BSTP_BPDU_STP_LEN); 377 break; 378 379 case BSTP_MSGTYPE_RSTP: 380 bpdu->cbu_protover = BSTP_PROTO_RSTP; 381 bpdu->cbu_versionlen = htons(0); 382 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_RSTP_LEN; 383 eh->ether_type = htons(BSTP_BPDU_RSTP_LEN); 384 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, 385 BSTP_BPDU_RSTP_LEN); 386 break; 387 388 default: 389 panic("not implemented"); 390 } 391 m->m_pkthdr.rcvif = ifp; 392 m->m_len = m->m_pkthdr.len; 393 394 bp->bp_txcount++; 395 ifp->if_transmit(ifp, m); 396 } 397 398 static int 399 bstp_pdu_flags(struct bstp_port *bp) 400 { 401 int flags = 0; 402 403 if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING) 404 flags |= BSTP_PDU_F_P; 405 406 if (bp->bp_agree) 407 flags |= BSTP_PDU_F_A; 408 409 if (bp->bp_tc_timer.active) 410 flags |= BSTP_PDU_F_TC; 411 412 if (bp->bp_tc_ack) 413 flags |= BSTP_PDU_F_TCA; 414 415 switch (bp->bp_state) { 416 case BSTP_IFSTATE_LEARNING: 417 flags |= BSTP_PDU_F_L; 418 break; 419 420 case BSTP_IFSTATE_FORWARDING: 421 flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F); 422 break; 423 } 424 425 switch (bp->bp_role) { 426 case BSTP_ROLE_ROOT: 427 flags |= 428 (BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT); 429 break; 430 431 case BSTP_ROLE_ALTERNATE: 432 case BSTP_ROLE_BACKUP: /* fall through */ 433 flags |= 434 (BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT); 435 break; 436 437 case BSTP_ROLE_DESIGNATED: 438 flags |= 439 (BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT); 440 break; 441 } 442 443 /* Strip off unused flags in either mode */ 444 switch (bp->bp_protover) { 445 case BSTP_PROTO_STP: 446 flags &= BSTP_PDU_STPMASK; 447 break; 448 case BSTP_PROTO_RSTP: 449 flags &= BSTP_PDU_RSTPMASK; 450 break; 451 } 452 return (flags); 453 } 454 455 void 456 bstp_input(struct bstp_port *bp, struct ifnet *ifp, struct mbuf *m) 457 { 458 struct bstp_state *bs = bp->bp_bs; 459 struct ether_header *eh; 460 struct bstp_tbpdu tpdu; 461 uint16_t len; 462 463 if (bp->bp_active == 0) { 464 m_freem(m); 465 return; 466 } 467 468 BSTP_LOCK(bs); 469 470 eh = mtod(m, struct ether_header *); 471 472 len = ntohs(eh->ether_type); 473 if (len < sizeof(tpdu)) 474 goto out; 475 476 m_adj(m, ETHER_HDR_LEN); 477 478 if (m->m_pkthdr.len > len) 479 m_adj(m, len - m->m_pkthdr.len); 480 if (m->m_len < sizeof(tpdu) && 481 (m = m_pullup(m, sizeof(tpdu))) == NULL) 482 goto out; 483 484 memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu)); 485 486 /* basic packet checks */ 487 if (tpdu.tbu_dsap != LLC_8021D_LSAP || 488 tpdu.tbu_ssap != LLC_8021D_LSAP || 489 tpdu.tbu_ctl != LLC_UI) 490 goto out; 491 if (tpdu.tbu_protoid != BSTP_PROTO_ID) 492 goto out; 493 494 /* 495 * We can treat later versions of the PDU as the same as the maximum 496 * version we implement. All additional parameters/flags are ignored. 497 */ 498 if (tpdu.tbu_protover > BSTP_PROTO_MAX) 499 tpdu.tbu_protover = BSTP_PROTO_MAX; 500 501 if (tpdu.tbu_protover != bp->bp_protover) { 502 /* 503 * Wait for the migration delay timer to expire before changing 504 * protocol version to avoid flip-flops. 505 */ 506 if (bp->bp_flags & BSTP_PORT_CANMIGRATE) 507 bstp_set_port_proto(bp, tpdu.tbu_protover); 508 else 509 goto out; 510 } 511 512 /* Clear operedge upon receiving a PDU on the port */ 513 bp->bp_operedge = 0; 514 bstp_timer_start(&bp->bp_edge_delay_timer, 515 BSTP_DEFAULT_MIGRATE_DELAY); 516 517 switch (tpdu.tbu_protover) { 518 case BSTP_PROTO_STP: 519 bstp_received_stp(bs, bp, &m, &tpdu); 520 break; 521 522 case BSTP_PROTO_RSTP: 523 bstp_received_rstp(bs, bp, &m, &tpdu); 524 break; 525 } 526 out: 527 BSTP_UNLOCK(bs); 528 if (m) 529 m_freem(m); 530 } 531 532 static void 533 bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp, 534 struct mbuf **mp, struct bstp_tbpdu *tpdu) 535 { 536 struct bstp_cbpdu cpdu; 537 struct bstp_config_unit *cu = &bp->bp_msg_cu; 538 struct bstp_tcn_unit tu; 539 540 switch (tpdu->tbu_bpdutype) { 541 case BSTP_MSGTYPE_TCN: 542 tu.tu_message_type = tpdu->tbu_bpdutype; 543 bstp_received_tcn(bs, bp, &tu); 544 break; 545 case BSTP_MSGTYPE_CFG: 546 if ((*mp)->m_len < BSTP_BPDU_STP_LEN && 547 (*mp = m_pullup(*mp, BSTP_BPDU_STP_LEN)) == NULL) 548 return; 549 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_STP_LEN); 550 551 bstp_decode_bpdu(bp, &cpdu, cu); 552 bstp_received_bpdu(bs, bp, cu); 553 break; 554 } 555 } 556 557 static void 558 bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp, 559 struct mbuf **mp, struct bstp_tbpdu *tpdu) 560 { 561 struct bstp_cbpdu cpdu; 562 struct bstp_config_unit *cu = &bp->bp_msg_cu; 563 564 if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP) 565 return; 566 567 if ((*mp)->m_len < BSTP_BPDU_RSTP_LEN && 568 (*mp = m_pullup(*mp, BSTP_BPDU_RSTP_LEN)) == NULL) 569 return; 570 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_RSTP_LEN); 571 572 bstp_decode_bpdu(bp, &cpdu, cu); 573 bstp_received_bpdu(bs, bp, cu); 574 } 575 576 static void 577 bstp_received_tcn(struct bstp_state *bs, struct bstp_port *bp, 578 struct bstp_tcn_unit *tcn) 579 { 580 bp->bp_rcvdtcn = 1; 581 bstp_update_tc(bp); 582 } 583 584 static void 585 bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp, 586 struct bstp_config_unit *cu) 587 { 588 int type; 589 590 BSTP_LOCK_ASSERT(bs); 591 592 /* We need to have transitioned to INFO_MINE before proceeding */ 593 switch (bp->bp_infois) { 594 case BSTP_INFO_DISABLED: 595 case BSTP_INFO_AGED: 596 return; 597 } 598 599 /* range checks */ 600 if (cu->cu_message_age >= cu->cu_max_age) { 601 return; 602 } 603 if (cu->cu_max_age < BSTP_MIN_MAX_AGE || 604 cu->cu_max_age > BSTP_MAX_MAX_AGE) { 605 return; 606 } 607 if (cu->cu_forward_delay < BSTP_MIN_FORWARD_DELAY || 608 cu->cu_forward_delay > BSTP_MAX_FORWARD_DELAY) { 609 return; 610 } 611 if (cu->cu_hello_time < BSTP_MIN_HELLO_TIME || 612 cu->cu_hello_time > BSTP_MAX_HELLO_TIME) { 613 return; 614 } 615 616 type = bstp_pdu_rcvtype(bp, cu); 617 618 switch (type) { 619 case BSTP_PDU_SUPERIOR: 620 bs->bs_allsynced = 0; 621 bp->bp_agreed = 0; 622 bp->bp_proposing = 0; 623 624 if (cu->cu_proposal && cu->cu_forwarding == 0) 625 bp->bp_proposed = 1; 626 if (cu->cu_topology_change) 627 bp->bp_rcvdtc = 1; 628 if (cu->cu_topology_change_ack) 629 bp->bp_rcvdtca = 1; 630 631 if (bp->bp_agree && 632 !bstp_pdu_bettersame(bp, BSTP_INFO_RECEIVED)) 633 bp->bp_agree = 0; 634 635 /* copy the received priority and timers to the port */ 636 bp->bp_port_pv = cu->cu_pv; 637 bp->bp_port_msg_age = cu->cu_message_age; 638 bp->bp_port_max_age = cu->cu_max_age; 639 bp->bp_port_fdelay = cu->cu_forward_delay; 640 bp->bp_port_htime = 641 (cu->cu_hello_time > BSTP_MIN_HELLO_TIME ? 642 cu->cu_hello_time : BSTP_MIN_HELLO_TIME); 643 644 /* set expiry for the new info */ 645 bstp_set_timer_msgage(bp); 646 647 bp->bp_infois = BSTP_INFO_RECEIVED; 648 bstp_assign_roles(bs); 649 break; 650 651 case BSTP_PDU_REPEATED: 652 if (cu->cu_proposal && cu->cu_forwarding == 0) 653 bp->bp_proposed = 1; 654 if (cu->cu_topology_change) 655 bp->bp_rcvdtc = 1; 656 if (cu->cu_topology_change_ack) 657 bp->bp_rcvdtca = 1; 658 659 /* rearm the age timer */ 660 bstp_set_timer_msgage(bp); 661 break; 662 663 case BSTP_PDU_INFERIOR: 664 if (cu->cu_learning) { 665 bp->bp_agreed = 1; 666 bp->bp_proposing = 0; 667 } 668 break; 669 670 case BSTP_PDU_INFERIORALT: 671 /* 672 * only point to point links are allowed fast 673 * transitions to forwarding. 674 */ 675 if (cu->cu_agree && bp->bp_ptp_link) { 676 bp->bp_agreed = 1; 677 bp->bp_proposing = 0; 678 } else 679 bp->bp_agreed = 0; 680 681 if (cu->cu_topology_change) 682 bp->bp_rcvdtc = 1; 683 if (cu->cu_topology_change_ack) 684 bp->bp_rcvdtca = 1; 685 break; 686 687 case BSTP_PDU_OTHER: 688 return; /* do nothing */ 689 } 690 /* update the state machines with the new data */ 691 bstp_update_state(bs, bp); 692 } 693 694 static int 695 bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu) 696 { 697 int type; 698 699 /* default return type */ 700 type = BSTP_PDU_OTHER; 701 702 switch (cu->cu_role) { 703 case BSTP_ROLE_DESIGNATED: 704 if (bstp_info_superior(&bp->bp_port_pv, &cu->cu_pv)) 705 /* bpdu priority is superior */ 706 type = BSTP_PDU_SUPERIOR; 707 else if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) == 708 INFO_SAME) { 709 if (bp->bp_port_msg_age != cu->cu_message_age || 710 bp->bp_port_max_age != cu->cu_max_age || 711 bp->bp_port_fdelay != cu->cu_forward_delay || 712 bp->bp_port_htime != cu->cu_hello_time) 713 /* bpdu priority is equal and timers differ */ 714 type = BSTP_PDU_SUPERIOR; 715 else 716 /* bpdu is equal */ 717 type = BSTP_PDU_REPEATED; 718 } else 719 /* bpdu priority is worse */ 720 type = BSTP_PDU_INFERIOR; 721 722 break; 723 724 case BSTP_ROLE_ROOT: 725 case BSTP_ROLE_ALTERNATE: 726 case BSTP_ROLE_BACKUP: 727 if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) <= INFO_SAME) 728 /* 729 * not a designated port and priority is the same or 730 * worse 731 */ 732 type = BSTP_PDU_INFERIORALT; 733 break; 734 } 735 736 return (type); 737 } 738 739 static int 740 bstp_pdu_bettersame(struct bstp_port *bp, int newinfo) 741 { 742 if (newinfo == BSTP_INFO_RECEIVED && 743 bp->bp_infois == BSTP_INFO_RECEIVED && 744 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME) 745 return (1); 746 747 if (newinfo == BSTP_INFO_MINE && 748 bp->bp_infois == BSTP_INFO_MINE && 749 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) >= INFO_SAME) 750 return (1); 751 752 return (0); 753 } 754 755 static int 756 bstp_info_cmp(struct bstp_pri_vector *pv, 757 struct bstp_pri_vector *cpv) 758 { 759 if (cpv->pv_root_id < pv->pv_root_id) 760 return (INFO_BETTER); 761 if (cpv->pv_root_id > pv->pv_root_id) 762 return (INFO_WORSE); 763 764 if (cpv->pv_cost < pv->pv_cost) 765 return (INFO_BETTER); 766 if (cpv->pv_cost > pv->pv_cost) 767 return (INFO_WORSE); 768 769 if (cpv->pv_dbridge_id < pv->pv_dbridge_id) 770 return (INFO_BETTER); 771 if (cpv->pv_dbridge_id > pv->pv_dbridge_id) 772 return (INFO_WORSE); 773 774 if (cpv->pv_dport_id < pv->pv_dport_id) 775 return (INFO_BETTER); 776 if (cpv->pv_dport_id > pv->pv_dport_id) 777 return (INFO_WORSE); 778 779 return (INFO_SAME); 780 } 781 782 /* 783 * This message priority vector is superior to the port priority vector and 784 * will replace it if, and only if, the message priority vector is better than 785 * the port priority vector, or the message has been transmitted from the same 786 * designated bridge and designated port as the port priority vector. 787 */ 788 static int 789 bstp_info_superior(struct bstp_pri_vector *pv, 790 struct bstp_pri_vector *cpv) 791 { 792 if (bstp_info_cmp(pv, cpv) == INFO_BETTER || 793 (bstp_same_bridgeid(pv->pv_dbridge_id, cpv->pv_dbridge_id) && 794 (cpv->pv_dport_id & 0xfff) == (pv->pv_dport_id & 0xfff))) 795 return (1); 796 return (0); 797 } 798 799 static void 800 bstp_assign_roles(struct bstp_state *bs) 801 { 802 struct bstp_port *bp, *rbp = NULL; 803 struct bstp_pri_vector pv; 804 805 /* default to our priority vector */ 806 bs->bs_root_pv = bs->bs_bridge_pv; 807 bs->bs_root_msg_age = 0; 808 bs->bs_root_max_age = bs->bs_bridge_max_age; 809 bs->bs_root_fdelay = bs->bs_bridge_fdelay; 810 bs->bs_root_htime = bs->bs_bridge_htime; 811 bs->bs_root_port = NULL; 812 813 /* check if any received info supersedes us */ 814 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 815 if (bp->bp_infois != BSTP_INFO_RECEIVED) 816 continue; 817 818 pv = bp->bp_port_pv; 819 pv.pv_cost += bp->bp_path_cost; 820 821 /* 822 * The root priority vector is the best of the set comprising 823 * the bridge priority vector plus all root path priority 824 * vectors whose bridge address is not equal to us. 825 */ 826 if (bstp_same_bridgeid(pv.pv_dbridge_id, 827 bs->bs_bridge_pv.pv_dbridge_id) == 0 && 828 bstp_info_cmp(&bs->bs_root_pv, &pv) == INFO_BETTER) { 829 /* the port vector replaces the root */ 830 bs->bs_root_pv = pv; 831 bs->bs_root_msg_age = bp->bp_port_msg_age + 832 BSTP_MESSAGE_AGE_INCR; 833 bs->bs_root_max_age = bp->bp_port_max_age; 834 bs->bs_root_fdelay = bp->bp_port_fdelay; 835 bs->bs_root_htime = bp->bp_port_htime; 836 rbp = bp; 837 } 838 } 839 840 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 841 /* calculate the port designated vector */ 842 bp->bp_desg_pv.pv_root_id = bs->bs_root_pv.pv_root_id; 843 bp->bp_desg_pv.pv_cost = bs->bs_root_pv.pv_cost; 844 bp->bp_desg_pv.pv_dbridge_id = bs->bs_bridge_pv.pv_dbridge_id; 845 bp->bp_desg_pv.pv_dport_id = bp->bp_port_id; 846 bp->bp_desg_pv.pv_port_id = bp->bp_port_id; 847 848 /* calculate designated times */ 849 bp->bp_desg_msg_age = bs->bs_root_msg_age; 850 bp->bp_desg_max_age = bs->bs_root_max_age; 851 bp->bp_desg_fdelay = bs->bs_root_fdelay; 852 bp->bp_desg_htime = bs->bs_bridge_htime; 853 854 switch (bp->bp_infois) { 855 case BSTP_INFO_DISABLED: 856 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 857 break; 858 859 case BSTP_INFO_AGED: 860 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 861 bstp_update_info(bp); 862 break; 863 864 case BSTP_INFO_MINE: 865 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 866 /* update the port info if stale */ 867 if (bstp_info_cmp(&bp->bp_port_pv, 868 &bp->bp_desg_pv) != INFO_SAME || 869 (rbp != NULL && 870 (bp->bp_port_msg_age != rbp->bp_port_msg_age || 871 bp->bp_port_max_age != rbp->bp_port_max_age || 872 bp->bp_port_fdelay != rbp->bp_port_fdelay || 873 bp->bp_port_htime != rbp->bp_port_htime))) 874 bstp_update_info(bp); 875 break; 876 877 case BSTP_INFO_RECEIVED: 878 if (bp == rbp) { 879 /* 880 * root priority is derived from this 881 * port, make it the root port. 882 */ 883 bstp_set_port_role(bp, BSTP_ROLE_ROOT); 884 bs->bs_root_port = bp; 885 } else if (bstp_info_cmp(&bp->bp_port_pv, 886 &bp->bp_desg_pv) == INFO_BETTER) { 887 /* 888 * the port priority is lower than the root 889 * port. 890 */ 891 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 892 bstp_update_info(bp); 893 } else { 894 if (bstp_same_bridgeid( 895 bp->bp_port_pv.pv_dbridge_id, 896 bs->bs_bridge_pv.pv_dbridge_id)) { 897 /* 898 * the designated bridge refers to 899 * another port on this bridge. 900 */ 901 bstp_set_port_role(bp, 902 BSTP_ROLE_BACKUP); 903 } else { 904 /* 905 * the port is an inferior path to the 906 * root bridge. 907 */ 908 bstp_set_port_role(bp, 909 BSTP_ROLE_ALTERNATE); 910 } 911 } 912 break; 913 } 914 } 915 } 916 917 static void 918 bstp_update_state(struct bstp_state *bs, struct bstp_port *bp) 919 { 920 struct bstp_port *bp2; 921 int synced; 922 923 BSTP_LOCK_ASSERT(bs); 924 925 /* check if all the ports have syncronised again */ 926 if (!bs->bs_allsynced) { 927 synced = 1; 928 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 929 if (!(bp2->bp_synced || 930 bp2->bp_role == BSTP_ROLE_ROOT)) { 931 synced = 0; 932 break; 933 } 934 } 935 bs->bs_allsynced = synced; 936 } 937 938 bstp_update_roles(bs, bp); 939 bstp_update_tc(bp); 940 } 941 942 static void 943 bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp) 944 { 945 NET_EPOCH_ASSERT(); 946 947 switch (bp->bp_role) { 948 case BSTP_ROLE_DISABLED: 949 /* Clear any flags if set */ 950 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 951 bp->bp_sync = 0; 952 bp->bp_synced = 1; 953 bp->bp_reroot = 0; 954 } 955 break; 956 957 case BSTP_ROLE_ALTERNATE: 958 case BSTP_ROLE_BACKUP: 959 if ((bs->bs_allsynced && !bp->bp_agree) || 960 (bp->bp_proposed && bp->bp_agree)) { 961 bp->bp_proposed = 0; 962 bp->bp_agree = 1; 963 bp->bp_flags |= BSTP_PORT_NEWINFO; 964 DPRINTF("%s -> ALTERNATE_AGREED\n", 965 bp->bp_ifp->if_xname); 966 } 967 968 if (bp->bp_proposed && !bp->bp_agree) { 969 bstp_set_all_sync(bs); 970 bp->bp_proposed = 0; 971 DPRINTF("%s -> ALTERNATE_PROPOSED\n", 972 bp->bp_ifp->if_xname); 973 } 974 975 /* Clear any flags if set */ 976 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 977 bp->bp_sync = 0; 978 bp->bp_synced = 1; 979 bp->bp_reroot = 0; 980 DPRINTF("%s -> ALTERNATE_PORT\n", bp->bp_ifp->if_xname); 981 } 982 break; 983 984 case BSTP_ROLE_ROOT: 985 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) { 986 bstp_set_all_reroot(bs); 987 DPRINTF("%s -> ROOT_REROOT\n", bp->bp_ifp->if_xname); 988 } 989 990 if ((bs->bs_allsynced && !bp->bp_agree) || 991 (bp->bp_proposed && bp->bp_agree)) { 992 bp->bp_proposed = 0; 993 bp->bp_sync = 0; 994 bp->bp_agree = 1; 995 bp->bp_flags |= BSTP_PORT_NEWINFO; 996 DPRINTF("%s -> ROOT_AGREED\n", bp->bp_ifp->if_xname); 997 } 998 999 if (bp->bp_proposed && !bp->bp_agree) { 1000 bstp_set_all_sync(bs); 1001 bp->bp_proposed = 0; 1002 DPRINTF("%s -> ROOT_PROPOSED\n", bp->bp_ifp->if_xname); 1003 } 1004 1005 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1006 (bp->bp_forward_delay_timer.active == 0 || 1007 (bstp_rerooted(bs, bp) && 1008 bp->bp_recent_backup_timer.active == 0 && 1009 bp->bp_protover == BSTP_PROTO_RSTP))) { 1010 switch (bp->bp_state) { 1011 case BSTP_IFSTATE_DISCARDING: 1012 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 1013 break; 1014 case BSTP_IFSTATE_LEARNING: 1015 bstp_set_port_state(bp, 1016 BSTP_IFSTATE_FORWARDING); 1017 break; 1018 } 1019 } 1020 1021 if (bp->bp_state == BSTP_IFSTATE_FORWARDING && bp->bp_reroot) { 1022 bp->bp_reroot = 0; 1023 DPRINTF("%s -> ROOT_REROOTED\n", bp->bp_ifp->if_xname); 1024 } 1025 break; 1026 1027 case BSTP_ROLE_DESIGNATED: 1028 if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) { 1029 bp->bp_reroot = 0; 1030 DPRINTF("%s -> DESIGNATED_RETIRED\n", 1031 bp->bp_ifp->if_xname); 1032 } 1033 1034 if ((bp->bp_state == BSTP_IFSTATE_DISCARDING && 1035 !bp->bp_synced) || (bp->bp_agreed && !bp->bp_synced) || 1036 (bp->bp_operedge && !bp->bp_synced) || 1037 (bp->bp_sync && bp->bp_synced)) { 1038 bstp_timer_stop(&bp->bp_recent_root_timer); 1039 bp->bp_synced = 1; 1040 bp->bp_sync = 0; 1041 DPRINTF("%s -> DESIGNATED_SYNCED\n", 1042 bp->bp_ifp->if_xname); 1043 } 1044 1045 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1046 !bp->bp_agreed && !bp->bp_proposing && 1047 !bp->bp_operedge) { 1048 bp->bp_proposing = 1; 1049 bp->bp_flags |= BSTP_PORT_NEWINFO; 1050 bstp_timer_start(&bp->bp_edge_delay_timer, 1051 (bp->bp_ptp_link ? BSTP_DEFAULT_MIGRATE_DELAY : 1052 bp->bp_desg_max_age)); 1053 DPRINTF("%s -> DESIGNATED_PROPOSE\n", 1054 bp->bp_ifp->if_xname); 1055 } 1056 1057 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1058 (bp->bp_forward_delay_timer.active == 0 || bp->bp_agreed || 1059 bp->bp_operedge) && 1060 (bp->bp_recent_root_timer.active == 0 || !bp->bp_reroot) && 1061 !bp->bp_sync) { 1062 if (bp->bp_agreed) 1063 DPRINTF("%s -> AGREED\n", bp->bp_ifp->if_xname); 1064 /* 1065 * If agreed|operedge then go straight to forwarding, 1066 * otherwise follow discard -> learn -> forward. 1067 */ 1068 if (bp->bp_agreed || bp->bp_operedge || 1069 bp->bp_state == BSTP_IFSTATE_LEARNING) { 1070 bstp_set_port_state(bp, 1071 BSTP_IFSTATE_FORWARDING); 1072 bp->bp_agreed = bp->bp_protover; 1073 } else if (bp->bp_state == BSTP_IFSTATE_DISCARDING) 1074 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 1075 } 1076 1077 if (((bp->bp_sync && !bp->bp_synced) || 1078 (bp->bp_reroot && bp->bp_recent_root_timer.active) || 1079 (bp->bp_flags & BSTP_PORT_DISPUTED)) && !bp->bp_operedge && 1080 bp->bp_state != BSTP_IFSTATE_DISCARDING) { 1081 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1082 bp->bp_flags &= ~BSTP_PORT_DISPUTED; 1083 bstp_timer_start(&bp->bp_forward_delay_timer, 1084 bp->bp_protover == BSTP_PROTO_RSTP ? 1085 bp->bp_desg_htime : bp->bp_desg_fdelay); 1086 DPRINTF("%s -> DESIGNATED_DISCARD\n", 1087 bp->bp_ifp->if_xname); 1088 } 1089 break; 1090 } 1091 1092 if (bp->bp_flags & BSTP_PORT_NEWINFO) 1093 bstp_transmit(bs, bp); 1094 } 1095 1096 static void 1097 bstp_update_tc(struct bstp_port *bp) 1098 { 1099 switch (bp->bp_tcstate) { 1100 case BSTP_TCSTATE_ACTIVE: 1101 if ((bp->bp_role != BSTP_ROLE_DESIGNATED && 1102 bp->bp_role != BSTP_ROLE_ROOT) || bp->bp_operedge) 1103 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1104 1105 if (bp->bp_rcvdtcn) 1106 bstp_set_port_tc(bp, BSTP_TCSTATE_TCN); 1107 if (bp->bp_rcvdtc) 1108 bstp_set_port_tc(bp, BSTP_TCSTATE_TC); 1109 1110 if (bp->bp_tc_prop && !bp->bp_operedge) 1111 bstp_set_port_tc(bp, BSTP_TCSTATE_PROPAG); 1112 1113 if (bp->bp_rcvdtca) 1114 bstp_set_port_tc(bp, BSTP_TCSTATE_ACK); 1115 break; 1116 1117 case BSTP_TCSTATE_INACTIVE: 1118 if ((bp->bp_state == BSTP_IFSTATE_LEARNING || 1119 bp->bp_state == BSTP_IFSTATE_FORWARDING) && 1120 bp->bp_fdbflush == 0) 1121 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1122 break; 1123 1124 case BSTP_TCSTATE_LEARNING: 1125 if (bp->bp_rcvdtc || bp->bp_rcvdtcn || bp->bp_rcvdtca || 1126 bp->bp_tc_prop) 1127 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1128 else if (bp->bp_role != BSTP_ROLE_DESIGNATED && 1129 bp->bp_role != BSTP_ROLE_ROOT && 1130 bp->bp_state == BSTP_IFSTATE_DISCARDING) 1131 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1132 1133 if ((bp->bp_role == BSTP_ROLE_DESIGNATED || 1134 bp->bp_role == BSTP_ROLE_ROOT) && 1135 bp->bp_state == BSTP_IFSTATE_FORWARDING && 1136 !bp->bp_operedge) 1137 bstp_set_port_tc(bp, BSTP_TCSTATE_DETECTED); 1138 break; 1139 1140 /* these are transient states and go straight back to ACTIVE */ 1141 case BSTP_TCSTATE_DETECTED: 1142 case BSTP_TCSTATE_TCN: 1143 case BSTP_TCSTATE_TC: 1144 case BSTP_TCSTATE_PROPAG: 1145 case BSTP_TCSTATE_ACK: 1146 DPRINTF("Invalid TC state for %s\n", 1147 bp->bp_ifp->if_xname); 1148 break; 1149 } 1150 1151 } 1152 1153 static void 1154 bstp_update_info(struct bstp_port *bp) 1155 { 1156 struct bstp_state *bs = bp->bp_bs; 1157 1158 bp->bp_proposing = 0; 1159 bp->bp_proposed = 0; 1160 1161 if (bp->bp_agreed && !bstp_pdu_bettersame(bp, BSTP_INFO_MINE)) 1162 bp->bp_agreed = 0; 1163 1164 if (bp->bp_synced && !bp->bp_agreed) { 1165 bp->bp_synced = 0; 1166 bs->bs_allsynced = 0; 1167 } 1168 1169 /* copy the designated pv to the port */ 1170 bp->bp_port_pv = bp->bp_desg_pv; 1171 bp->bp_port_msg_age = bp->bp_desg_msg_age; 1172 bp->bp_port_max_age = bp->bp_desg_max_age; 1173 bp->bp_port_fdelay = bp->bp_desg_fdelay; 1174 bp->bp_port_htime = bp->bp_desg_htime; 1175 bp->bp_infois = BSTP_INFO_MINE; 1176 1177 /* Set transmit flag but do not immediately send */ 1178 bp->bp_flags |= BSTP_PORT_NEWINFO; 1179 } 1180 1181 /* set tcprop on every port other than the caller */ 1182 static void 1183 bstp_set_other_tcprop(struct bstp_port *bp) 1184 { 1185 struct bstp_state *bs = bp->bp_bs; 1186 struct bstp_port *bp2; 1187 1188 BSTP_LOCK_ASSERT(bs); 1189 1190 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1191 if (bp2 == bp) 1192 continue; 1193 bp2->bp_tc_prop = 1; 1194 } 1195 } 1196 1197 static void 1198 bstp_set_all_reroot(struct bstp_state *bs) 1199 { 1200 struct bstp_port *bp; 1201 1202 BSTP_LOCK_ASSERT(bs); 1203 1204 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1205 bp->bp_reroot = 1; 1206 } 1207 1208 static void 1209 bstp_set_all_sync(struct bstp_state *bs) 1210 { 1211 struct bstp_port *bp; 1212 1213 BSTP_LOCK_ASSERT(bs); 1214 1215 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1216 bp->bp_sync = 1; 1217 bp->bp_synced = 0; /* Not explicit in spec */ 1218 } 1219 1220 bs->bs_allsynced = 0; 1221 } 1222 1223 static void 1224 bstp_set_port_state(struct bstp_port *bp, int state) 1225 { 1226 if (bp->bp_state == state) 1227 return; 1228 1229 bp->bp_state = state; 1230 1231 switch (bp->bp_state) { 1232 case BSTP_IFSTATE_DISCARDING: 1233 DPRINTF("state changed to DISCARDING on %s\n", 1234 bp->bp_ifp->if_xname); 1235 break; 1236 1237 case BSTP_IFSTATE_LEARNING: 1238 DPRINTF("state changed to LEARNING on %s\n", 1239 bp->bp_ifp->if_xname); 1240 1241 bstp_timer_start(&bp->bp_forward_delay_timer, 1242 bp->bp_protover == BSTP_PROTO_RSTP ? 1243 bp->bp_desg_htime : bp->bp_desg_fdelay); 1244 break; 1245 1246 case BSTP_IFSTATE_FORWARDING: 1247 DPRINTF("state changed to FORWARDING on %s\n", 1248 bp->bp_ifp->if_xname); 1249 1250 bstp_timer_stop(&bp->bp_forward_delay_timer); 1251 /* Record that we enabled forwarding */ 1252 bp->bp_forward_transitions++; 1253 break; 1254 } 1255 1256 /* notify the parent bridge */ 1257 taskqueue_enqueue(taskqueue_swi, &bp->bp_statetask); 1258 } 1259 1260 static void 1261 bstp_set_port_role(struct bstp_port *bp, int role) 1262 { 1263 struct bstp_state *bs = bp->bp_bs; 1264 1265 if (bp->bp_role == role) 1266 return; 1267 1268 /* perform pre-change tasks */ 1269 switch (bp->bp_role) { 1270 case BSTP_ROLE_DISABLED: 1271 bstp_timer_start(&bp->bp_forward_delay_timer, 1272 bp->bp_desg_max_age); 1273 break; 1274 1275 case BSTP_ROLE_BACKUP: 1276 bstp_timer_start(&bp->bp_recent_backup_timer, 1277 bp->bp_desg_htime * 2); 1278 /* fall through */ 1279 case BSTP_ROLE_ALTERNATE: 1280 bstp_timer_start(&bp->bp_forward_delay_timer, 1281 bp->bp_desg_fdelay); 1282 bp->bp_sync = 0; 1283 bp->bp_synced = 1; 1284 bp->bp_reroot = 0; 1285 break; 1286 1287 case BSTP_ROLE_ROOT: 1288 bstp_timer_start(&bp->bp_recent_root_timer, 1289 BSTP_DEFAULT_FORWARD_DELAY); 1290 break; 1291 } 1292 1293 bp->bp_role = role; 1294 /* clear values not carried between roles */ 1295 bp->bp_proposing = 0; 1296 bs->bs_allsynced = 0; 1297 1298 /* initialise the new role */ 1299 switch (bp->bp_role) { 1300 case BSTP_ROLE_DISABLED: 1301 case BSTP_ROLE_ALTERNATE: 1302 case BSTP_ROLE_BACKUP: 1303 DPRINTF("%s role -> ALT/BACK/DISABLED\n", 1304 bp->bp_ifp->if_xname); 1305 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1306 bstp_timer_stop(&bp->bp_recent_root_timer); 1307 bstp_timer_latch(&bp->bp_forward_delay_timer); 1308 bp->bp_sync = 0; 1309 bp->bp_synced = 1; 1310 bp->bp_reroot = 0; 1311 break; 1312 1313 case BSTP_ROLE_ROOT: 1314 DPRINTF("%s role -> ROOT\n", 1315 bp->bp_ifp->if_xname); 1316 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1317 bstp_timer_latch(&bp->bp_recent_root_timer); 1318 bp->bp_proposing = 0; 1319 break; 1320 1321 case BSTP_ROLE_DESIGNATED: 1322 DPRINTF("%s role -> DESIGNATED\n", 1323 bp->bp_ifp->if_xname); 1324 bstp_timer_start(&bp->bp_hello_timer, 1325 bp->bp_desg_htime); 1326 bp->bp_agree = 0; 1327 break; 1328 } 1329 1330 /* let the TC state know that the role changed */ 1331 bstp_update_tc(bp); 1332 } 1333 1334 static void 1335 bstp_set_port_proto(struct bstp_port *bp, int proto) 1336 { 1337 struct bstp_state *bs = bp->bp_bs; 1338 1339 /* supported protocol versions */ 1340 switch (proto) { 1341 case BSTP_PROTO_STP: 1342 /* we can downgrade protocols only */ 1343 bstp_timer_stop(&bp->bp_migrate_delay_timer); 1344 /* clear unsupported features */ 1345 bp->bp_operedge = 0; 1346 /* STP compat mode only uses 16 bits of the 32 */ 1347 if (bp->bp_path_cost > 65535) 1348 bp->bp_path_cost = 65535; 1349 break; 1350 1351 case BSTP_PROTO_RSTP: 1352 bstp_timer_start(&bp->bp_migrate_delay_timer, 1353 bs->bs_migration_delay); 1354 break; 1355 1356 default: 1357 DPRINTF("Unsupported STP version %d\n", proto); 1358 return; 1359 } 1360 1361 bp->bp_protover = proto; 1362 bp->bp_flags &= ~BSTP_PORT_CANMIGRATE; 1363 } 1364 1365 static void 1366 bstp_set_port_tc(struct bstp_port *bp, int state) 1367 { 1368 struct bstp_state *bs = bp->bp_bs; 1369 1370 bp->bp_tcstate = state; 1371 1372 /* initialise the new state */ 1373 switch (bp->bp_tcstate) { 1374 case BSTP_TCSTATE_ACTIVE: 1375 DPRINTF("%s -> TC_ACTIVE\n", bp->bp_ifp->if_xname); 1376 /* nothing to do */ 1377 break; 1378 1379 case BSTP_TCSTATE_INACTIVE: 1380 bstp_timer_stop(&bp->bp_tc_timer); 1381 /* flush routes on the parent bridge */ 1382 bp->bp_fdbflush = 1; 1383 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask); 1384 bp->bp_tc_ack = 0; 1385 DPRINTF("%s -> TC_INACTIVE\n", bp->bp_ifp->if_xname); 1386 break; 1387 1388 case BSTP_TCSTATE_LEARNING: 1389 bp->bp_rcvdtc = 0; 1390 bp->bp_rcvdtcn = 0; 1391 bp->bp_rcvdtca = 0; 1392 bp->bp_tc_prop = 0; 1393 DPRINTF("%s -> TC_LEARNING\n", bp->bp_ifp->if_xname); 1394 break; 1395 1396 case BSTP_TCSTATE_DETECTED: 1397 bstp_set_timer_tc(bp); 1398 bstp_set_other_tcprop(bp); 1399 /* send out notification */ 1400 bp->bp_flags |= BSTP_PORT_NEWINFO; 1401 bstp_transmit(bs, bp); 1402 getmicrotime(&bs->bs_last_tc_time); 1403 DPRINTF("%s -> TC_DETECTED\n", bp->bp_ifp->if_xname); 1404 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1405 break; 1406 1407 case BSTP_TCSTATE_TCN: 1408 bstp_set_timer_tc(bp); 1409 DPRINTF("%s -> TC_TCN\n", bp->bp_ifp->if_xname); 1410 /* fall through */ 1411 case BSTP_TCSTATE_TC: 1412 bp->bp_rcvdtc = 0; 1413 bp->bp_rcvdtcn = 0; 1414 if (bp->bp_role == BSTP_ROLE_DESIGNATED) 1415 bp->bp_tc_ack = 1; 1416 1417 bstp_set_other_tcprop(bp); 1418 DPRINTF("%s -> TC_TC\n", bp->bp_ifp->if_xname); 1419 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1420 break; 1421 1422 case BSTP_TCSTATE_PROPAG: 1423 /* flush routes on the parent bridge */ 1424 bp->bp_fdbflush = 1; 1425 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask); 1426 bp->bp_tc_prop = 0; 1427 bstp_set_timer_tc(bp); 1428 DPRINTF("%s -> TC_PROPAG\n", bp->bp_ifp->if_xname); 1429 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1430 break; 1431 1432 case BSTP_TCSTATE_ACK: 1433 bstp_timer_stop(&bp->bp_tc_timer); 1434 bp->bp_rcvdtca = 0; 1435 DPRINTF("%s -> TC_ACK\n", bp->bp_ifp->if_xname); 1436 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1437 break; 1438 } 1439 } 1440 1441 static void 1442 bstp_set_timer_tc(struct bstp_port *bp) 1443 { 1444 struct bstp_state *bs = bp->bp_bs; 1445 1446 if (bp->bp_tc_timer.active) 1447 return; 1448 1449 switch (bp->bp_protover) { 1450 case BSTP_PROTO_RSTP: 1451 bstp_timer_start(&bp->bp_tc_timer, 1452 bp->bp_desg_htime + BSTP_TICK_VAL); 1453 bp->bp_flags |= BSTP_PORT_NEWINFO; 1454 break; 1455 1456 case BSTP_PROTO_STP: 1457 bstp_timer_start(&bp->bp_tc_timer, 1458 bs->bs_root_max_age + bs->bs_root_fdelay); 1459 break; 1460 } 1461 } 1462 1463 static void 1464 bstp_set_timer_msgage(struct bstp_port *bp) 1465 { 1466 if (bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR <= 1467 bp->bp_port_max_age) { 1468 bstp_timer_start(&bp->bp_message_age_timer, 1469 bp->bp_port_htime * 3); 1470 } else 1471 /* expires immediately */ 1472 bstp_timer_start(&bp->bp_message_age_timer, 0); 1473 } 1474 1475 static int 1476 bstp_rerooted(struct bstp_state *bs, struct bstp_port *bp) 1477 { 1478 struct bstp_port *bp2; 1479 int rr_set = 0; 1480 1481 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1482 if (bp2 == bp) 1483 continue; 1484 if (bp2->bp_recent_root_timer.active) { 1485 rr_set = 1; 1486 break; 1487 } 1488 } 1489 return (!rr_set); 1490 } 1491 1492 int 1493 bstp_set_htime(struct bstp_state *bs, int t) 1494 { 1495 /* convert seconds to ticks */ 1496 t *= BSTP_TICK_VAL; 1497 1498 /* value can only be changed in leagacy stp mode */ 1499 if (bs->bs_protover != BSTP_PROTO_STP) 1500 return (EPERM); 1501 1502 if (t < BSTP_MIN_HELLO_TIME || t > BSTP_MAX_HELLO_TIME) 1503 return (EINVAL); 1504 1505 BSTP_LOCK(bs); 1506 bs->bs_bridge_htime = t; 1507 bstp_reinit(bs); 1508 BSTP_UNLOCK(bs); 1509 return (0); 1510 } 1511 1512 int 1513 bstp_set_fdelay(struct bstp_state *bs, int t) 1514 { 1515 /* convert seconds to ticks */ 1516 t *= BSTP_TICK_VAL; 1517 1518 if (t < BSTP_MIN_FORWARD_DELAY || t > BSTP_MAX_FORWARD_DELAY) 1519 return (EINVAL); 1520 1521 BSTP_LOCK(bs); 1522 bs->bs_bridge_fdelay = t; 1523 bstp_reinit(bs); 1524 BSTP_UNLOCK(bs); 1525 return (0); 1526 } 1527 1528 int 1529 bstp_set_maxage(struct bstp_state *bs, int t) 1530 { 1531 /* convert seconds to ticks */ 1532 t *= BSTP_TICK_VAL; 1533 1534 if (t < BSTP_MIN_MAX_AGE || t > BSTP_MAX_MAX_AGE) 1535 return (EINVAL); 1536 1537 BSTP_LOCK(bs); 1538 bs->bs_bridge_max_age = t; 1539 bstp_reinit(bs); 1540 BSTP_UNLOCK(bs); 1541 return (0); 1542 } 1543 1544 int 1545 bstp_set_holdcount(struct bstp_state *bs, int count) 1546 { 1547 struct bstp_port *bp; 1548 1549 if (count < BSTP_MIN_HOLD_COUNT || 1550 count > BSTP_MAX_HOLD_COUNT) 1551 return (EINVAL); 1552 1553 BSTP_LOCK(bs); 1554 bs->bs_txholdcount = count; 1555 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1556 bp->bp_txcount = 0; 1557 BSTP_UNLOCK(bs); 1558 return (0); 1559 } 1560 1561 int 1562 bstp_set_protocol(struct bstp_state *bs, int proto) 1563 { 1564 struct bstp_port *bp; 1565 1566 switch (proto) { 1567 /* Supported protocol versions */ 1568 case BSTP_PROTO_STP: 1569 case BSTP_PROTO_RSTP: 1570 break; 1571 1572 default: 1573 return (EINVAL); 1574 } 1575 1576 BSTP_LOCK(bs); 1577 bs->bs_protover = proto; 1578 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 1579 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1580 /* reinit state */ 1581 bp->bp_infois = BSTP_INFO_DISABLED; 1582 bp->bp_txcount = 0; 1583 bstp_set_port_proto(bp, bs->bs_protover); 1584 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 1585 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1586 bstp_timer_stop(&bp->bp_recent_backup_timer); 1587 } 1588 bstp_reinit(bs); 1589 BSTP_UNLOCK(bs); 1590 return (0); 1591 } 1592 1593 int 1594 bstp_set_priority(struct bstp_state *bs, int pri) 1595 { 1596 if (pri < 0 || pri > BSTP_MAX_PRIORITY) 1597 return (EINVAL); 1598 1599 /* Limit to steps of 4096 */ 1600 pri -= pri % 4096; 1601 1602 BSTP_LOCK(bs); 1603 bs->bs_bridge_priority = pri; 1604 bstp_reinit(bs); 1605 BSTP_UNLOCK(bs); 1606 return (0); 1607 } 1608 1609 int 1610 bstp_set_port_priority(struct bstp_port *bp, int pri) 1611 { 1612 struct bstp_state *bs = bp->bp_bs; 1613 1614 if (pri < 0 || pri > BSTP_MAX_PORT_PRIORITY) 1615 return (EINVAL); 1616 1617 /* Limit to steps of 16 */ 1618 pri -= pri % 16; 1619 1620 BSTP_LOCK(bs); 1621 bp->bp_priority = pri; 1622 bstp_reinit(bs); 1623 BSTP_UNLOCK(bs); 1624 return (0); 1625 } 1626 1627 int 1628 bstp_set_path_cost(struct bstp_port *bp, uint32_t path_cost) 1629 { 1630 struct bstp_state *bs = bp->bp_bs; 1631 1632 if (path_cost > BSTP_MAX_PATH_COST) 1633 return (EINVAL); 1634 1635 /* STP compat mode only uses 16 bits of the 32 */ 1636 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1637 path_cost = 65535; 1638 1639 BSTP_LOCK(bs); 1640 1641 if (path_cost == 0) { /* use auto */ 1642 bp->bp_flags &= ~BSTP_PORT_ADMCOST; 1643 bp->bp_path_cost = bstp_calc_path_cost(bp); 1644 } else { 1645 bp->bp_path_cost = path_cost; 1646 bp->bp_flags |= BSTP_PORT_ADMCOST; 1647 } 1648 bstp_reinit(bs); 1649 BSTP_UNLOCK(bs); 1650 return (0); 1651 } 1652 1653 int 1654 bstp_set_edge(struct bstp_port *bp, int set) 1655 { 1656 struct bstp_state *bs = bp->bp_bs; 1657 1658 BSTP_LOCK(bs); 1659 if ((bp->bp_operedge = set) == 0) 1660 bp->bp_flags &= ~BSTP_PORT_ADMEDGE; 1661 else 1662 bp->bp_flags |= BSTP_PORT_ADMEDGE; 1663 BSTP_UNLOCK(bs); 1664 return (0); 1665 } 1666 1667 int 1668 bstp_set_autoedge(struct bstp_port *bp, int set) 1669 { 1670 struct bstp_state *bs = bp->bp_bs; 1671 1672 BSTP_LOCK(bs); 1673 if (set) { 1674 bp->bp_flags |= BSTP_PORT_AUTOEDGE; 1675 /* we may be able to transition straight to edge */ 1676 if (bp->bp_edge_delay_timer.active == 0) 1677 bstp_edge_delay_expiry(bs, bp); 1678 } else 1679 bp->bp_flags &= ~BSTP_PORT_AUTOEDGE; 1680 BSTP_UNLOCK(bs); 1681 return (0); 1682 } 1683 1684 int 1685 bstp_set_ptp(struct bstp_port *bp, int set) 1686 { 1687 struct bstp_state *bs = bp->bp_bs; 1688 1689 BSTP_LOCK(bs); 1690 bp->bp_ptp_link = set; 1691 BSTP_UNLOCK(bs); 1692 return (0); 1693 } 1694 1695 int 1696 bstp_set_autoptp(struct bstp_port *bp, int set) 1697 { 1698 struct bstp_state *bs = bp->bp_bs; 1699 1700 BSTP_LOCK(bs); 1701 if (set) { 1702 bp->bp_flags |= BSTP_PORT_AUTOPTP; 1703 if (bp->bp_role != BSTP_ROLE_DISABLED) 1704 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 1705 } else 1706 bp->bp_flags &= ~BSTP_PORT_AUTOPTP; 1707 BSTP_UNLOCK(bs); 1708 return (0); 1709 } 1710 1711 /* 1712 * Calculate the path cost according to the link speed. 1713 */ 1714 static uint32_t 1715 bstp_calc_path_cost(struct bstp_port *bp) 1716 { 1717 struct ifnet *ifp = bp->bp_ifp; 1718 uint32_t path_cost; 1719 1720 /* If the priority has been manually set then retain the value */ 1721 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1722 return bp->bp_path_cost; 1723 1724 if (ifp->if_link_state == LINK_STATE_DOWN) { 1725 /* Recalc when the link comes up again */ 1726 bp->bp_flags |= BSTP_PORT_PNDCOST; 1727 return (BSTP_DEFAULT_PATH_COST); 1728 } 1729 1730 if (ifp->if_baudrate < 1000) 1731 return (BSTP_DEFAULT_PATH_COST); 1732 1733 /* formula from section 17.14, IEEE Std 802.1D-2004 */ 1734 path_cost = 20000000000ULL / (ifp->if_baudrate / 1000); 1735 1736 if (path_cost > BSTP_MAX_PATH_COST) 1737 path_cost = BSTP_MAX_PATH_COST; 1738 1739 /* STP compat mode only uses 16 bits of the 32 */ 1740 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1741 path_cost = 65535; 1742 1743 return (path_cost); 1744 } 1745 1746 /* 1747 * Notify the bridge that a port state has changed, we need to do this from a 1748 * taskqueue to avoid a LOR. 1749 */ 1750 static void 1751 bstp_notify_state(void *arg, int pending) 1752 { 1753 struct bstp_port *bp = (struct bstp_port *)arg; 1754 struct bstp_state *bs = bp->bp_bs; 1755 1756 if (bp->bp_active == 1 && bs->bs_state_cb != NULL) 1757 (*bs->bs_state_cb)(bp->bp_ifp, bp->bp_state); 1758 } 1759 1760 /* 1761 * Flush the routes on the bridge port, we need to do this from a 1762 * taskqueue to avoid a LOR. 1763 */ 1764 static void 1765 bstp_notify_rtage(void *arg, int pending) 1766 { 1767 struct bstp_port *bp = (struct bstp_port *)arg; 1768 struct bstp_state *bs = bp->bp_bs; 1769 int age = 0; 1770 1771 BSTP_LOCK(bs); 1772 switch (bp->bp_protover) { 1773 case BSTP_PROTO_STP: 1774 /* convert to seconds */ 1775 age = bp->bp_desg_fdelay / BSTP_TICK_VAL; 1776 break; 1777 1778 case BSTP_PROTO_RSTP: 1779 age = 0; 1780 break; 1781 } 1782 BSTP_UNLOCK(bs); 1783 1784 if (bp->bp_active == 1 && bs->bs_rtage_cb != NULL) 1785 (*bs->bs_rtage_cb)(bp->bp_ifp, age); 1786 1787 /* flush is complete */ 1788 BSTP_LOCK(bs); 1789 bp->bp_fdbflush = 0; 1790 BSTP_UNLOCK(bs); 1791 } 1792 1793 void 1794 bstp_linkstate(struct bstp_port *bp) 1795 { 1796 struct bstp_state *bs = bp->bp_bs; 1797 1798 if (!bp->bp_active) 1799 return; 1800 1801 bstp_ifupdstatus(bp, 0); 1802 BSTP_LOCK(bs); 1803 bstp_update_state(bs, bp); 1804 BSTP_UNLOCK(bs); 1805 } 1806 1807 static void 1808 bstp_ifupdstatus(void *arg, int pending) 1809 { 1810 struct bstp_port *bp = (struct bstp_port *)arg; 1811 struct bstp_state *bs = bp->bp_bs; 1812 struct ifnet *ifp = bp->bp_ifp; 1813 struct ifmediareq ifmr; 1814 int error, changed; 1815 1816 if (!bp->bp_active) 1817 return; 1818 1819 bzero((char *)&ifmr, sizeof(ifmr)); 1820 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr); 1821 1822 BSTP_LOCK(bs); 1823 changed = 0; 1824 if ((error == 0) && (ifp->if_flags & IFF_UP)) { 1825 if (ifmr.ifm_status & IFM_ACTIVE) { 1826 /* A full-duplex link is assumed to be point to point */ 1827 if (bp->bp_flags & BSTP_PORT_AUTOPTP) { 1828 int fdx; 1829 1830 fdx = ifmr.ifm_active & IFM_FDX ? 1 : 0; 1831 if (bp->bp_ptp_link ^ fdx) { 1832 bp->bp_ptp_link = fdx; 1833 changed = 1; 1834 } 1835 } 1836 1837 /* Calc the cost if the link was down previously */ 1838 if (bp->bp_flags & BSTP_PORT_PNDCOST) { 1839 uint32_t cost; 1840 1841 cost = bstp_calc_path_cost(bp); 1842 if (bp->bp_path_cost != cost) { 1843 bp->bp_path_cost = cost; 1844 changed = 1; 1845 } 1846 bp->bp_flags &= ~BSTP_PORT_PNDCOST; 1847 } 1848 1849 if (bp->bp_role == BSTP_ROLE_DISABLED) { 1850 bstp_enable_port(bs, bp); 1851 changed = 1; 1852 } 1853 } else { 1854 if (bp->bp_role != BSTP_ROLE_DISABLED) { 1855 bstp_disable_port(bs, bp); 1856 changed = 1; 1857 if ((bp->bp_flags & BSTP_PORT_ADMEDGE) && 1858 bp->bp_protover == BSTP_PROTO_RSTP) 1859 bp->bp_operedge = 1; 1860 } 1861 } 1862 } else if (bp->bp_infois != BSTP_INFO_DISABLED) { 1863 bstp_disable_port(bs, bp); 1864 changed = 1; 1865 } 1866 if (changed) 1867 bstp_assign_roles(bs); 1868 BSTP_UNLOCK(bs); 1869 } 1870 1871 static void 1872 bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp) 1873 { 1874 bp->bp_infois = BSTP_INFO_AGED; 1875 } 1876 1877 static void 1878 bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp) 1879 { 1880 bp->bp_infois = BSTP_INFO_DISABLED; 1881 } 1882 1883 static void 1884 bstp_tick(void *arg) 1885 { 1886 struct epoch_tracker et; 1887 struct bstp_state *bs = arg; 1888 struct bstp_port *bp; 1889 1890 BSTP_LOCK_ASSERT(bs); 1891 1892 if (bs->bs_running == 0) 1893 return; 1894 1895 NET_EPOCH_ENTER(et); 1896 CURVNET_SET(bs->bs_vnet); 1897 1898 /* poll link events on interfaces that do not support linkstate */ 1899 if (bstp_timer_dectest(&bs->bs_link_timer)) { 1900 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1901 if (!(bp->bp_ifp->if_capabilities & IFCAP_LINKSTATE)) 1902 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 1903 } 1904 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 1905 } 1906 1907 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1908 /* no events need to happen for these */ 1909 bstp_timer_dectest(&bp->bp_tc_timer); 1910 bstp_timer_dectest(&bp->bp_recent_root_timer); 1911 bstp_timer_dectest(&bp->bp_forward_delay_timer); 1912 bstp_timer_dectest(&bp->bp_recent_backup_timer); 1913 1914 if (bstp_timer_dectest(&bp->bp_hello_timer)) 1915 bstp_hello_timer_expiry(bs, bp); 1916 1917 if (bstp_timer_dectest(&bp->bp_message_age_timer)) 1918 bstp_message_age_expiry(bs, bp); 1919 1920 if (bstp_timer_dectest(&bp->bp_migrate_delay_timer)) 1921 bstp_migrate_delay_expiry(bs, bp); 1922 1923 if (bstp_timer_dectest(&bp->bp_edge_delay_timer)) 1924 bstp_edge_delay_expiry(bs, bp); 1925 1926 /* update the various state machines for the port */ 1927 bstp_update_state(bs, bp); 1928 1929 if (bp->bp_txcount > 0) 1930 bp->bp_txcount--; 1931 } 1932 1933 CURVNET_RESTORE(); 1934 NET_EPOCH_EXIT(et); 1935 1936 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 1937 } 1938 1939 static void 1940 bstp_timer_start(struct bstp_timer *t, uint16_t v) 1941 { 1942 t->value = v; 1943 t->active = 1; 1944 t->latched = 0; 1945 } 1946 1947 static void 1948 bstp_timer_stop(struct bstp_timer *t) 1949 { 1950 t->value = 0; 1951 t->active = 0; 1952 t->latched = 0; 1953 } 1954 1955 static void 1956 bstp_timer_latch(struct bstp_timer *t) 1957 { 1958 t->latched = 1; 1959 t->active = 1; 1960 } 1961 1962 static int 1963 bstp_timer_dectest(struct bstp_timer *t) 1964 { 1965 if (t->active == 0 || t->latched) 1966 return (0); 1967 t->value -= BSTP_TICK_VAL; 1968 if (t->value <= 0) { 1969 bstp_timer_stop(t); 1970 return (1); 1971 } 1972 return (0); 1973 } 1974 1975 static void 1976 bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp) 1977 { 1978 if ((bp->bp_flags & BSTP_PORT_NEWINFO) || 1979 bp->bp_role == BSTP_ROLE_DESIGNATED || 1980 (bp->bp_role == BSTP_ROLE_ROOT && 1981 bp->bp_tc_timer.active == 1)) { 1982 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 1983 bp->bp_flags |= BSTP_PORT_NEWINFO; 1984 bstp_transmit(bs, bp); 1985 } 1986 } 1987 1988 static void 1989 bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp) 1990 { 1991 if (bp->bp_infois == BSTP_INFO_RECEIVED) { 1992 bp->bp_infois = BSTP_INFO_AGED; 1993 bstp_assign_roles(bs); 1994 DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname); 1995 } 1996 } 1997 1998 static void 1999 bstp_migrate_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 2000 { 2001 bp->bp_flags |= BSTP_PORT_CANMIGRATE; 2002 } 2003 2004 static void 2005 bstp_edge_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 2006 { 2007 if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) && 2008 bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing && 2009 bp->bp_role == BSTP_ROLE_DESIGNATED) { 2010 bp->bp_operedge = 1; 2011 DPRINTF("%s -> edge port\n", bp->bp_ifp->if_xname); 2012 } 2013 } 2014 2015 static int 2016 bstp_addr_cmp(const uint8_t *a, const uint8_t *b) 2017 { 2018 int i, d; 2019 2020 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2021 d = ((int)a[i]) - ((int)b[i]); 2022 } 2023 2024 return (d); 2025 } 2026 2027 /* 2028 * compare the bridge address component of the bridgeid 2029 */ 2030 static int 2031 bstp_same_bridgeid(uint64_t id1, uint64_t id2) 2032 { 2033 u_char addr1[ETHER_ADDR_LEN]; 2034 u_char addr2[ETHER_ADDR_LEN]; 2035 2036 PV2ADDR(id1, addr1); 2037 PV2ADDR(id2, addr2); 2038 2039 if (bstp_addr_cmp(addr1, addr2) == 0) 2040 return (1); 2041 2042 return (0); 2043 } 2044 2045 void 2046 bstp_reinit(struct bstp_state *bs) 2047 { 2048 struct epoch_tracker et; 2049 struct bstp_port *bp; 2050 struct ifnet *ifp, *mif; 2051 u_char *e_addr; 2052 void *bridgeptr; 2053 static const u_char llzero[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 2054 2055 BSTP_LOCK_ASSERT(bs); 2056 2057 if (LIST_EMPTY(&bs->bs_bplist)) 2058 goto disablestp; 2059 2060 mif = NULL; 2061 bridgeptr = LIST_FIRST(&bs->bs_bplist)->bp_ifp->if_bridge; 2062 KASSERT(bridgeptr != NULL, ("Invalid bridge pointer")); 2063 /* 2064 * Search through the Ethernet adapters and find the one with the 2065 * lowest value. Make sure the adapter which we take the MAC address 2066 * from is part of this bridge, so we can have more than one independent 2067 * bridges in the same STP domain. 2068 */ 2069 NET_EPOCH_ENTER(et); 2070 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2071 if (ifp->if_type != IFT_ETHER && ifp->if_type != IFT_L2VLAN) 2072 continue; /* Not Ethernet */ 2073 2074 if (ifp->if_bridge != bridgeptr) 2075 continue; /* Not part of our bridge */ 2076 2077 if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0) 2078 continue; /* No mac address set */ 2079 2080 if (mif == NULL) { 2081 mif = ifp; 2082 continue; 2083 } 2084 if (bstp_addr_cmp(IF_LLADDR(ifp), IF_LLADDR(mif)) < 0) { 2085 mif = ifp; 2086 continue; 2087 } 2088 } 2089 NET_EPOCH_EXIT(et); 2090 if (mif == NULL) 2091 goto disablestp; 2092 2093 e_addr = IF_LLADDR(mif); 2094 bs->bs_bridge_pv.pv_dbridge_id = 2095 (((uint64_t)bs->bs_bridge_priority) << 48) | 2096 (((uint64_t)e_addr[0]) << 40) | 2097 (((uint64_t)e_addr[1]) << 32) | 2098 (((uint64_t)e_addr[2]) << 24) | 2099 (((uint64_t)e_addr[3]) << 16) | 2100 (((uint64_t)e_addr[4]) << 8) | 2101 (((uint64_t)e_addr[5])); 2102 2103 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2104 bs->bs_bridge_pv.pv_cost = 0; 2105 bs->bs_bridge_pv.pv_dport_id = 0; 2106 bs->bs_bridge_pv.pv_port_id = 0; 2107 2108 if (bs->bs_running && callout_pending(&bs->bs_bstpcallout) == 0) 2109 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2110 2111 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2112 bp->bp_port_id = (bp->bp_priority << 8) | 2113 (bp->bp_ifp->if_index & 0xfff); 2114 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 2115 } 2116 2117 bstp_assign_roles(bs); 2118 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 2119 return; 2120 2121 disablestp: 2122 /* Set the bridge and root id (lower bits) to zero */ 2123 bs->bs_bridge_pv.pv_dbridge_id = 2124 ((uint64_t)bs->bs_bridge_priority) << 48; 2125 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2126 bs->bs_root_pv = bs->bs_bridge_pv; 2127 /* Disable any remaining ports, they will have no MAC address */ 2128 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2129 bp->bp_infois = BSTP_INFO_DISABLED; 2130 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2131 } 2132 callout_stop(&bs->bs_bstpcallout); 2133 } 2134 2135 static int 2136 bstp_modevent(module_t mod, int type, void *data) 2137 { 2138 switch (type) { 2139 case MOD_LOAD: 2140 mtx_init(&bstp_list_mtx, "bridgestp list", NULL, MTX_DEF); 2141 LIST_INIT(&bstp_list); 2142 break; 2143 case MOD_UNLOAD: 2144 mtx_destroy(&bstp_list_mtx); 2145 break; 2146 default: 2147 return (EOPNOTSUPP); 2148 } 2149 return (0); 2150 } 2151 2152 static moduledata_t bstp_mod = { 2153 "bridgestp", 2154 bstp_modevent, 2155 0 2156 }; 2157 2158 DECLARE_MODULE(bridgestp, bstp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2159 MODULE_VERSION(bridgestp, 1); 2160 2161 void 2162 bstp_attach(struct bstp_state *bs, struct bstp_cb_ops *cb) 2163 { 2164 BSTP_LOCK_INIT(bs); 2165 callout_init_mtx(&bs->bs_bstpcallout, &bs->bs_mtx, 0); 2166 LIST_INIT(&bs->bs_bplist); 2167 2168 bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 2169 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 2170 bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY; 2171 bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 2172 bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME; 2173 bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY; 2174 bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT; 2175 bs->bs_protover = BSTP_PROTO_RSTP; 2176 bs->bs_state_cb = cb->bcb_state; 2177 bs->bs_rtage_cb = cb->bcb_rtage; 2178 bs->bs_vnet = curvnet; 2179 2180 getmicrotime(&bs->bs_last_tc_time); 2181 2182 mtx_lock(&bstp_list_mtx); 2183 LIST_INSERT_HEAD(&bstp_list, bs, bs_list); 2184 mtx_unlock(&bstp_list_mtx); 2185 } 2186 2187 void 2188 bstp_detach(struct bstp_state *bs) 2189 { 2190 KASSERT(LIST_EMPTY(&bs->bs_bplist), ("bstp still active")); 2191 2192 mtx_lock(&bstp_list_mtx); 2193 LIST_REMOVE(bs, bs_list); 2194 mtx_unlock(&bstp_list_mtx); 2195 callout_drain(&bs->bs_bstpcallout); 2196 BSTP_LOCK_DESTROY(bs); 2197 } 2198 2199 void 2200 bstp_init(struct bstp_state *bs) 2201 { 2202 BSTP_LOCK(bs); 2203 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2204 bs->bs_running = 1; 2205 bstp_reinit(bs); 2206 BSTP_UNLOCK(bs); 2207 } 2208 2209 void 2210 bstp_stop(struct bstp_state *bs) 2211 { 2212 struct bstp_port *bp; 2213 2214 BSTP_LOCK(bs); 2215 2216 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 2217 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2218 2219 bs->bs_running = 0; 2220 callout_stop(&bs->bs_bstpcallout); 2221 BSTP_UNLOCK(bs); 2222 } 2223 2224 int 2225 bstp_create(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *ifp) 2226 { 2227 bzero(bp, sizeof(struct bstp_port)); 2228 2229 BSTP_LOCK(bs); 2230 bp->bp_ifp = ifp; 2231 bp->bp_bs = bs; 2232 bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY; 2233 TASK_INIT(&bp->bp_statetask, 0, bstp_notify_state, bp); 2234 TASK_INIT(&bp->bp_rtagetask, 0, bstp_notify_rtage, bp); 2235 TASK_INIT(&bp->bp_mediatask, 0, bstp_ifupdstatus, bp); 2236 2237 /* Init state */ 2238 bp->bp_infois = BSTP_INFO_DISABLED; 2239 bp->bp_flags = BSTP_PORT_AUTOEDGE|BSTP_PORT_AUTOPTP; 2240 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2241 bstp_set_port_proto(bp, bs->bs_protover); 2242 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2243 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 2244 bp->bp_path_cost = bstp_calc_path_cost(bp); 2245 BSTP_UNLOCK(bs); 2246 return (0); 2247 } 2248 2249 int 2250 bstp_enable(struct bstp_port *bp) 2251 { 2252 struct bstp_state *bs = bp->bp_bs; 2253 struct ifnet *ifp = bp->bp_ifp; 2254 2255 KASSERT(bp->bp_active == 0, ("already a bstp member")); 2256 NET_EPOCH_ASSERT(); /* Because bstp_update_roles() causes traffic. */ 2257 2258 switch (ifp->if_type) { 2259 case IFT_ETHER: /* These can do spanning tree. */ 2260 case IFT_L2VLAN: 2261 break; 2262 default: 2263 /* Nothing else can. */ 2264 return (EINVAL); 2265 } 2266 2267 BSTP_LOCK(bs); 2268 LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next); 2269 bp->bp_active = 1; 2270 bp->bp_flags |= BSTP_PORT_NEWINFO; 2271 bstp_reinit(bs); 2272 bstp_update_roles(bs, bp); 2273 BSTP_UNLOCK(bs); 2274 return (0); 2275 } 2276 2277 void 2278 bstp_disable(struct bstp_port *bp) 2279 { 2280 struct bstp_state *bs = bp->bp_bs; 2281 2282 KASSERT(bp->bp_active == 1, ("not a bstp member")); 2283 2284 BSTP_LOCK(bs); 2285 bstp_disable_port(bs, bp); 2286 LIST_REMOVE(bp, bp_next); 2287 bp->bp_active = 0; 2288 bstp_reinit(bs); 2289 BSTP_UNLOCK(bs); 2290 } 2291 2292 /* 2293 * The bstp_port structure is about to be freed by the parent bridge. 2294 */ 2295 void 2296 bstp_destroy(struct bstp_port *bp) 2297 { 2298 KASSERT(bp->bp_active == 0, ("port is still attached")); 2299 taskqueue_drain(taskqueue_swi, &bp->bp_statetask); 2300 taskqueue_drain(taskqueue_swi, &bp->bp_rtagetask); 2301 taskqueue_drain(taskqueue_swi, &bp->bp_mediatask); 2302 2303 if (bp->bp_bs->bs_root_port == bp) 2304 bstp_assign_roles(bp->bp_bs); 2305 } 2306