1 /* $NetBSD: bridgestp.c,v 1.5 2003/11/28 08:56:48 keihan Exp $ */ 2 3 /* 4 * Copyright (c) 2000 Jason L. Wright (jason@thought.net) 5 * Copyright (c) 2006 Andrew Thompson (thompsa@FreeBSD.org) 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 26 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 * 29 * OpenBSD: bridgestp.c,v 1.5 2001/03/22 03:48:29 jason Exp 30 */ 31 32 /* 33 * Implementation of the spanning tree protocol as defined in 34 * ISO/IEC 802.1D-2004, June 9, 2004. 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 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/callout.h> 47 #include <sys/module.h> 48 #include <sys/proc.h> 49 #include <sys/lock.h> 50 #include <sys/mutex.h> 51 #include <sys/taskqueue.h> 52 53 #include <net/if.h> 54 #include <net/if_var.h> 55 #include <net/if_dl.h> 56 #include <net/if_types.h> 57 #include <net/if_llc.h> 58 #include <net/if_media.h> 59 #include <net/vnet.h> 60 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/in_var.h> 64 #include <netinet/if_ether.h> 65 #include <net/bridgestp.h> 66 67 #ifdef BRIDGESTP_DEBUG 68 #define DPRINTF(fmt, arg...) printf("bstp: " fmt, ##arg) 69 #else 70 #define DPRINTF(fmt, arg...) (void)0 71 #endif 72 73 #define PV2ADDR(pv, eaddr) do { \ 74 eaddr[0] = pv >> 40; \ 75 eaddr[1] = pv >> 32; \ 76 eaddr[2] = pv >> 24; \ 77 eaddr[3] = pv >> 16; \ 78 eaddr[4] = pv >> 8; \ 79 eaddr[5] = pv >> 0; \ 80 } while (0) 81 82 #define INFO_BETTER 1 83 #define INFO_SAME 0 84 #define INFO_WORSE -1 85 86 const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; 87 88 LIST_HEAD(, bstp_state) bstp_list; 89 static struct mtx bstp_list_mtx; 90 91 static void bstp_transmit(struct bstp_state *, struct bstp_port *); 92 static void bstp_transmit_bpdu(struct bstp_state *, struct bstp_port *); 93 static void bstp_transmit_tcn(struct bstp_state *, struct bstp_port *); 94 static void bstp_decode_bpdu(struct bstp_port *, struct bstp_cbpdu *, 95 struct bstp_config_unit *); 96 static void bstp_send_bpdu(struct bstp_state *, struct bstp_port *, 97 struct bstp_cbpdu *); 98 static int bstp_pdu_flags(struct bstp_port *); 99 static void bstp_received_stp(struct bstp_state *, struct bstp_port *, 100 struct mbuf **, struct bstp_tbpdu *); 101 static void bstp_received_rstp(struct bstp_state *, struct bstp_port *, 102 struct mbuf **, struct bstp_tbpdu *); 103 static void bstp_received_tcn(struct bstp_state *, struct bstp_port *, 104 struct bstp_tcn_unit *); 105 static void bstp_received_bpdu(struct bstp_state *, struct bstp_port *, 106 struct bstp_config_unit *); 107 static int bstp_pdu_rcvtype(struct bstp_port *, struct bstp_config_unit *); 108 static int bstp_pdu_bettersame(struct bstp_port *, int); 109 static int bstp_info_cmp(struct bstp_pri_vector *, 110 struct bstp_pri_vector *); 111 static int bstp_info_superior(struct bstp_pri_vector *, 112 struct bstp_pri_vector *); 113 static void bstp_assign_roles(struct bstp_state *); 114 static void bstp_update_roles(struct bstp_state *, struct bstp_port *); 115 static void bstp_update_state(struct bstp_state *, struct bstp_port *); 116 static void bstp_update_tc(struct bstp_port *); 117 static void bstp_update_info(struct bstp_port *); 118 static void bstp_set_other_tcprop(struct bstp_port *); 119 static void bstp_set_all_reroot(struct bstp_state *); 120 static void bstp_set_all_sync(struct bstp_state *); 121 static void bstp_set_port_state(struct bstp_port *, int); 122 static void bstp_set_port_role(struct bstp_port *, int); 123 static void bstp_set_port_proto(struct bstp_port *, int); 124 static void bstp_set_port_tc(struct bstp_port *, int); 125 static void bstp_set_timer_tc(struct bstp_port *); 126 static void bstp_set_timer_msgage(struct bstp_port *); 127 static int bstp_rerooted(struct bstp_state *, struct bstp_port *); 128 static uint32_t bstp_calc_path_cost(struct bstp_port *); 129 static void bstp_notify_state(void *, int); 130 static void bstp_notify_rtage(void *, int); 131 static void bstp_ifupdstatus(void *, int); 132 static void bstp_enable_port(struct bstp_state *, struct bstp_port *); 133 static void bstp_disable_port(struct bstp_state *, struct bstp_port *); 134 static void bstp_tick(void *); 135 static void bstp_timer_start(struct bstp_timer *, uint16_t); 136 static void bstp_timer_stop(struct bstp_timer *); 137 static void bstp_timer_latch(struct bstp_timer *); 138 static int bstp_timer_dectest(struct bstp_timer *); 139 static void bstp_hello_timer_expiry(struct bstp_state *, 140 struct bstp_port *); 141 static void bstp_message_age_expiry(struct bstp_state *, 142 struct bstp_port *); 143 static void bstp_migrate_delay_expiry(struct bstp_state *, 144 struct bstp_port *); 145 static void bstp_edge_delay_expiry(struct bstp_state *, 146 struct bstp_port *); 147 static int bstp_addr_cmp(const uint8_t *, const uint8_t *); 148 static int bstp_same_bridgeid(uint64_t, uint64_t); 149 static void bstp_reinit(struct bstp_state *); 150 151 static void 152 bstp_transmit(struct bstp_state *bs, struct bstp_port *bp) 153 { 154 if (bs->bs_running == 0) 155 return; 156 157 /* 158 * a PDU can only be sent if we have tx quota left and the 159 * hello timer is running. 160 */ 161 if (bp->bp_hello_timer.active == 0) { 162 /* Test if it needs to be reset */ 163 bstp_hello_timer_expiry(bs, bp); 164 return; 165 } 166 if (bp->bp_txcount > bs->bs_txholdcount) 167 /* Ran out of karma */ 168 return; 169 170 if (bp->bp_protover == BSTP_PROTO_RSTP) { 171 bstp_transmit_bpdu(bs, bp); 172 bp->bp_tc_ack = 0; 173 } else { /* STP */ 174 switch (bp->bp_role) { 175 case BSTP_ROLE_DESIGNATED: 176 bstp_transmit_bpdu(bs, bp); 177 bp->bp_tc_ack = 0; 178 break; 179 180 case BSTP_ROLE_ROOT: 181 bstp_transmit_tcn(bs, bp); 182 break; 183 } 184 } 185 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 186 bp->bp_flags &= ~BSTP_PORT_NEWINFO; 187 } 188 189 static void 190 bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp) 191 { 192 struct bstp_cbpdu bpdu; 193 194 BSTP_LOCK_ASSERT(bs); 195 196 bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48); 197 PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr); 198 199 bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost); 200 201 bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48); 202 PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr); 203 204 bpdu.cbu_portid = htons(bp->bp_port_id); 205 bpdu.cbu_messageage = htons(bp->bp_desg_msg_age); 206 bpdu.cbu_maxage = htons(bp->bp_desg_max_age); 207 bpdu.cbu_hellotime = htons(bp->bp_desg_htime); 208 bpdu.cbu_forwarddelay = htons(bp->bp_desg_fdelay); 209 210 bpdu.cbu_flags = bstp_pdu_flags(bp); 211 212 switch (bp->bp_protover) { 213 case BSTP_PROTO_STP: 214 bpdu.cbu_bpdutype = BSTP_MSGTYPE_CFG; 215 break; 216 217 case BSTP_PROTO_RSTP: 218 bpdu.cbu_bpdutype = BSTP_MSGTYPE_RSTP; 219 break; 220 } 221 222 bstp_send_bpdu(bs, bp, &bpdu); 223 } 224 225 static void 226 bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp) 227 { 228 struct bstp_tbpdu bpdu; 229 struct ifnet *ifp = bp->bp_ifp; 230 struct ether_header *eh; 231 struct mbuf *m; 232 233 KASSERT(bp == bs->bs_root_port, ("%s: bad root port\n", __func__)); 234 235 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 236 return; 237 238 m = m_gethdr(M_NOWAIT, MT_DATA); 239 if (m == NULL) 240 return; 241 242 m->m_pkthdr.rcvif = ifp; 243 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); 244 m->m_len = m->m_pkthdr.len; 245 246 eh = mtod(m, struct ether_header *); 247 248 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); 249 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 250 eh->ether_type = htons(sizeof(bpdu)); 251 252 bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP; 253 bpdu.tbu_ctl = LLC_UI; 254 bpdu.tbu_protoid = 0; 255 bpdu.tbu_protover = 0; 256 bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN; 257 258 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu)); 259 260 bp->bp_txcount++; 261 ifp->if_transmit(ifp, m); 262 } 263 264 static void 265 bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu, 266 struct bstp_config_unit *cu) 267 { 268 int flags; 269 270 cu->cu_pv.pv_root_id = 271 (((uint64_t)ntohs(cpdu->cbu_rootpri)) << 48) | 272 (((uint64_t)cpdu->cbu_rootaddr[0]) << 40) | 273 (((uint64_t)cpdu->cbu_rootaddr[1]) << 32) | 274 (((uint64_t)cpdu->cbu_rootaddr[2]) << 24) | 275 (((uint64_t)cpdu->cbu_rootaddr[3]) << 16) | 276 (((uint64_t)cpdu->cbu_rootaddr[4]) << 8) | 277 (((uint64_t)cpdu->cbu_rootaddr[5]) << 0); 278 279 cu->cu_pv.pv_dbridge_id = 280 (((uint64_t)ntohs(cpdu->cbu_bridgepri)) << 48) | 281 (((uint64_t)cpdu->cbu_bridgeaddr[0]) << 40) | 282 (((uint64_t)cpdu->cbu_bridgeaddr[1]) << 32) | 283 (((uint64_t)cpdu->cbu_bridgeaddr[2]) << 24) | 284 (((uint64_t)cpdu->cbu_bridgeaddr[3]) << 16) | 285 (((uint64_t)cpdu->cbu_bridgeaddr[4]) << 8) | 286 (((uint64_t)cpdu->cbu_bridgeaddr[5]) << 0); 287 288 cu->cu_pv.pv_cost = ntohl(cpdu->cbu_rootpathcost); 289 cu->cu_message_age = ntohs(cpdu->cbu_messageage); 290 cu->cu_max_age = ntohs(cpdu->cbu_maxage); 291 cu->cu_hello_time = ntohs(cpdu->cbu_hellotime); 292 cu->cu_forward_delay = ntohs(cpdu->cbu_forwarddelay); 293 cu->cu_pv.pv_dport_id = ntohs(cpdu->cbu_portid); 294 cu->cu_pv.pv_port_id = bp->bp_port_id; 295 cu->cu_message_type = cpdu->cbu_bpdutype; 296 297 /* Strip off unused flags in STP mode */ 298 flags = cpdu->cbu_flags; 299 switch (cpdu->cbu_protover) { 300 case BSTP_PROTO_STP: 301 flags &= BSTP_PDU_STPMASK; 302 /* A STP BPDU explicitly conveys a Designated Port */ 303 cu->cu_role = BSTP_ROLE_DESIGNATED; 304 break; 305 306 case BSTP_PROTO_RSTP: 307 flags &= BSTP_PDU_RSTPMASK; 308 break; 309 } 310 311 cu->cu_topology_change_ack = 312 (flags & BSTP_PDU_F_TCA) ? 1 : 0; 313 cu->cu_proposal = 314 (flags & BSTP_PDU_F_P) ? 1 : 0; 315 cu->cu_agree = 316 (flags & BSTP_PDU_F_A) ? 1 : 0; 317 cu->cu_learning = 318 (flags & BSTP_PDU_F_L) ? 1 : 0; 319 cu->cu_forwarding = 320 (flags & BSTP_PDU_F_F) ? 1 : 0; 321 cu->cu_topology_change = 322 (flags & BSTP_PDU_F_TC) ? 1 : 0; 323 324 switch ((flags & BSTP_PDU_PRMASK) >> BSTP_PDU_PRSHIFT) { 325 case BSTP_PDU_F_ROOT: 326 cu->cu_role = BSTP_ROLE_ROOT; 327 break; 328 case BSTP_PDU_F_ALT: 329 cu->cu_role = BSTP_ROLE_ALTERNATE; 330 break; 331 case BSTP_PDU_F_DESG: 332 cu->cu_role = BSTP_ROLE_DESIGNATED; 333 break; 334 } 335 } 336 337 static void 338 bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp, 339 struct bstp_cbpdu *bpdu) 340 { 341 struct ifnet *ifp; 342 struct mbuf *m; 343 struct ether_header *eh; 344 345 BSTP_LOCK_ASSERT(bs); 346 347 ifp = bp->bp_ifp; 348 349 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 350 return; 351 352 m = m_gethdr(M_NOWAIT, MT_DATA); 353 if (m == NULL) 354 return; 355 356 eh = mtod(m, struct ether_header *); 357 358 bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP; 359 bpdu->cbu_ctl = LLC_UI; 360 bpdu->cbu_protoid = htons(BSTP_PROTO_ID); 361 362 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); 363 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 364 365 switch (bpdu->cbu_bpdutype) { 366 case BSTP_MSGTYPE_CFG: 367 bpdu->cbu_protover = BSTP_PROTO_STP; 368 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_STP_LEN; 369 eh->ether_type = htons(BSTP_BPDU_STP_LEN); 370 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, 371 BSTP_BPDU_STP_LEN); 372 break; 373 374 case BSTP_MSGTYPE_RSTP: 375 bpdu->cbu_protover = BSTP_PROTO_RSTP; 376 bpdu->cbu_versionlen = htons(0); 377 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_RSTP_LEN; 378 eh->ether_type = htons(BSTP_BPDU_RSTP_LEN); 379 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, 380 BSTP_BPDU_RSTP_LEN); 381 break; 382 383 default: 384 panic("not implemented"); 385 } 386 m->m_pkthdr.rcvif = ifp; 387 m->m_len = m->m_pkthdr.len; 388 389 bp->bp_txcount++; 390 ifp->if_transmit(ifp, m); 391 } 392 393 static int 394 bstp_pdu_flags(struct bstp_port *bp) 395 { 396 int flags = 0; 397 398 if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING) 399 flags |= BSTP_PDU_F_P; 400 401 if (bp->bp_agree) 402 flags |= BSTP_PDU_F_A; 403 404 if (bp->bp_tc_timer.active) 405 flags |= BSTP_PDU_F_TC; 406 407 if (bp->bp_tc_ack) 408 flags |= BSTP_PDU_F_TCA; 409 410 switch (bp->bp_state) { 411 case BSTP_IFSTATE_LEARNING: 412 flags |= BSTP_PDU_F_L; 413 break; 414 415 case BSTP_IFSTATE_FORWARDING: 416 flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F); 417 break; 418 } 419 420 switch (bp->bp_role) { 421 case BSTP_ROLE_ROOT: 422 flags |= 423 (BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT); 424 break; 425 426 case BSTP_ROLE_ALTERNATE: 427 case BSTP_ROLE_BACKUP: /* fall through */ 428 flags |= 429 (BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT); 430 break; 431 432 case BSTP_ROLE_DESIGNATED: 433 flags |= 434 (BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT); 435 break; 436 } 437 438 /* Strip off unused flags in either mode */ 439 switch (bp->bp_protover) { 440 case BSTP_PROTO_STP: 441 flags &= BSTP_PDU_STPMASK; 442 break; 443 case BSTP_PROTO_RSTP: 444 flags &= BSTP_PDU_RSTPMASK; 445 break; 446 } 447 return (flags); 448 } 449 450 void 451 bstp_input(struct bstp_port *bp, struct ifnet *ifp, struct mbuf *m) 452 { 453 struct bstp_state *bs = bp->bp_bs; 454 struct ether_header *eh; 455 struct bstp_tbpdu tpdu; 456 uint16_t len; 457 458 if (bp->bp_active == 0) { 459 m_freem(m); 460 return; 461 } 462 463 BSTP_LOCK(bs); 464 465 eh = mtod(m, struct ether_header *); 466 467 len = ntohs(eh->ether_type); 468 if (len < sizeof(tpdu)) 469 goto out; 470 471 m_adj(m, ETHER_HDR_LEN); 472 473 if (m->m_pkthdr.len > len) 474 m_adj(m, len - m->m_pkthdr.len); 475 if (m->m_len < sizeof(tpdu) && 476 (m = m_pullup(m, sizeof(tpdu))) == NULL) 477 goto out; 478 479 memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu)); 480 481 /* basic packet checks */ 482 if (tpdu.tbu_dsap != LLC_8021D_LSAP || 483 tpdu.tbu_ssap != LLC_8021D_LSAP || 484 tpdu.tbu_ctl != LLC_UI) 485 goto out; 486 if (tpdu.tbu_protoid != BSTP_PROTO_ID) 487 goto out; 488 489 /* 490 * We can treat later versions of the PDU as the same as the maximum 491 * version we implement. All additional parameters/flags are ignored. 492 */ 493 if (tpdu.tbu_protover > BSTP_PROTO_MAX) 494 tpdu.tbu_protover = BSTP_PROTO_MAX; 495 496 if (tpdu.tbu_protover != bp->bp_protover) { 497 /* 498 * Wait for the migration delay timer to expire before changing 499 * protocol version to avoid flip-flops. 500 */ 501 if (bp->bp_flags & BSTP_PORT_CANMIGRATE) 502 bstp_set_port_proto(bp, tpdu.tbu_protover); 503 else 504 goto out; 505 } 506 507 /* Clear operedge upon receiving a PDU on the port */ 508 bp->bp_operedge = 0; 509 bstp_timer_start(&bp->bp_edge_delay_timer, 510 BSTP_DEFAULT_MIGRATE_DELAY); 511 512 switch (tpdu.tbu_protover) { 513 case BSTP_PROTO_STP: 514 bstp_received_stp(bs, bp, &m, &tpdu); 515 break; 516 517 case BSTP_PROTO_RSTP: 518 bstp_received_rstp(bs, bp, &m, &tpdu); 519 break; 520 } 521 out: 522 BSTP_UNLOCK(bs); 523 if (m) 524 m_freem(m); 525 } 526 527 static void 528 bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp, 529 struct mbuf **mp, struct bstp_tbpdu *tpdu) 530 { 531 struct bstp_cbpdu cpdu; 532 struct bstp_config_unit *cu = &bp->bp_msg_cu; 533 struct bstp_tcn_unit tu; 534 535 switch (tpdu->tbu_bpdutype) { 536 case BSTP_MSGTYPE_TCN: 537 tu.tu_message_type = tpdu->tbu_bpdutype; 538 bstp_received_tcn(bs, bp, &tu); 539 break; 540 case BSTP_MSGTYPE_CFG: 541 if ((*mp)->m_len < BSTP_BPDU_STP_LEN && 542 (*mp = m_pullup(*mp, BSTP_BPDU_STP_LEN)) == NULL) 543 return; 544 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_STP_LEN); 545 546 bstp_decode_bpdu(bp, &cpdu, cu); 547 bstp_received_bpdu(bs, bp, cu); 548 break; 549 } 550 } 551 552 static void 553 bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp, 554 struct mbuf **mp, struct bstp_tbpdu *tpdu) 555 { 556 struct bstp_cbpdu cpdu; 557 struct bstp_config_unit *cu = &bp->bp_msg_cu; 558 559 if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP) 560 return; 561 562 if ((*mp)->m_len < BSTP_BPDU_RSTP_LEN && 563 (*mp = m_pullup(*mp, BSTP_BPDU_RSTP_LEN)) == NULL) 564 return; 565 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_RSTP_LEN); 566 567 bstp_decode_bpdu(bp, &cpdu, cu); 568 bstp_received_bpdu(bs, bp, cu); 569 } 570 571 static void 572 bstp_received_tcn(struct bstp_state *bs, struct bstp_port *bp, 573 struct bstp_tcn_unit *tcn) 574 { 575 bp->bp_rcvdtcn = 1; 576 bstp_update_tc(bp); 577 } 578 579 static void 580 bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp, 581 struct bstp_config_unit *cu) 582 { 583 int type; 584 585 BSTP_LOCK_ASSERT(bs); 586 587 /* We need to have transitioned to INFO_MINE before proceeding */ 588 switch (bp->bp_infois) { 589 case BSTP_INFO_DISABLED: 590 case BSTP_INFO_AGED: 591 return; 592 } 593 594 type = bstp_pdu_rcvtype(bp, cu); 595 596 switch (type) { 597 case BSTP_PDU_SUPERIOR: 598 bs->bs_allsynced = 0; 599 bp->bp_agreed = 0; 600 bp->bp_proposing = 0; 601 602 if (cu->cu_proposal && cu->cu_forwarding == 0) 603 bp->bp_proposed = 1; 604 if (cu->cu_topology_change) 605 bp->bp_rcvdtc = 1; 606 if (cu->cu_topology_change_ack) 607 bp->bp_rcvdtca = 1; 608 609 if (bp->bp_agree && 610 !bstp_pdu_bettersame(bp, BSTP_INFO_RECEIVED)) 611 bp->bp_agree = 0; 612 613 /* copy the received priority and timers to the port */ 614 bp->bp_port_pv = cu->cu_pv; 615 bp->bp_port_msg_age = cu->cu_message_age; 616 bp->bp_port_max_age = cu->cu_max_age; 617 bp->bp_port_fdelay = cu->cu_forward_delay; 618 bp->bp_port_htime = 619 (cu->cu_hello_time > BSTP_MIN_HELLO_TIME ? 620 cu->cu_hello_time : BSTP_MIN_HELLO_TIME); 621 622 /* set expiry for the new info */ 623 bstp_set_timer_msgage(bp); 624 625 bp->bp_infois = BSTP_INFO_RECEIVED; 626 bstp_assign_roles(bs); 627 break; 628 629 case BSTP_PDU_REPEATED: 630 if (cu->cu_proposal && cu->cu_forwarding == 0) 631 bp->bp_proposed = 1; 632 if (cu->cu_topology_change) 633 bp->bp_rcvdtc = 1; 634 if (cu->cu_topology_change_ack) 635 bp->bp_rcvdtca = 1; 636 637 /* rearm the age timer */ 638 bstp_set_timer_msgage(bp); 639 break; 640 641 case BSTP_PDU_INFERIOR: 642 if (cu->cu_learning) { 643 bp->bp_agreed = 1; 644 bp->bp_proposing = 0; 645 } 646 break; 647 648 case BSTP_PDU_INFERIORALT: 649 /* 650 * only point to point links are allowed fast 651 * transitions to forwarding. 652 */ 653 if (cu->cu_agree && bp->bp_ptp_link) { 654 bp->bp_agreed = 1; 655 bp->bp_proposing = 0; 656 } else 657 bp->bp_agreed = 0; 658 659 if (cu->cu_topology_change) 660 bp->bp_rcvdtc = 1; 661 if (cu->cu_topology_change_ack) 662 bp->bp_rcvdtca = 1; 663 break; 664 665 case BSTP_PDU_OTHER: 666 return; /* do nothing */ 667 } 668 /* update the state machines with the new data */ 669 bstp_update_state(bs, bp); 670 } 671 672 static int 673 bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu) 674 { 675 int type; 676 677 /* default return type */ 678 type = BSTP_PDU_OTHER; 679 680 switch (cu->cu_role) { 681 case BSTP_ROLE_DESIGNATED: 682 if (bstp_info_superior(&bp->bp_port_pv, &cu->cu_pv)) 683 /* bpdu priority is superior */ 684 type = BSTP_PDU_SUPERIOR; 685 else if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) == 686 INFO_SAME) { 687 if (bp->bp_port_msg_age != cu->cu_message_age || 688 bp->bp_port_max_age != cu->cu_max_age || 689 bp->bp_port_fdelay != cu->cu_forward_delay || 690 bp->bp_port_htime != cu->cu_hello_time) 691 /* bpdu priority is equal and timers differ */ 692 type = BSTP_PDU_SUPERIOR; 693 else 694 /* bpdu is equal */ 695 type = BSTP_PDU_REPEATED; 696 } else 697 /* bpdu priority is worse */ 698 type = BSTP_PDU_INFERIOR; 699 700 break; 701 702 case BSTP_ROLE_ROOT: 703 case BSTP_ROLE_ALTERNATE: 704 case BSTP_ROLE_BACKUP: 705 if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) <= INFO_SAME) 706 /* 707 * not a designated port and priority is the same or 708 * worse 709 */ 710 type = BSTP_PDU_INFERIORALT; 711 break; 712 } 713 714 return (type); 715 } 716 717 static int 718 bstp_pdu_bettersame(struct bstp_port *bp, int newinfo) 719 { 720 if (newinfo == BSTP_INFO_RECEIVED && 721 bp->bp_infois == BSTP_INFO_RECEIVED && 722 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME) 723 return (1); 724 725 if (newinfo == BSTP_INFO_MINE && 726 bp->bp_infois == BSTP_INFO_MINE && 727 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) >= INFO_SAME) 728 return (1); 729 730 return (0); 731 } 732 733 static int 734 bstp_info_cmp(struct bstp_pri_vector *pv, 735 struct bstp_pri_vector *cpv) 736 { 737 if (cpv->pv_root_id < pv->pv_root_id) 738 return (INFO_BETTER); 739 if (cpv->pv_root_id > pv->pv_root_id) 740 return (INFO_WORSE); 741 742 if (cpv->pv_cost < pv->pv_cost) 743 return (INFO_BETTER); 744 if (cpv->pv_cost > pv->pv_cost) 745 return (INFO_WORSE); 746 747 if (cpv->pv_dbridge_id < pv->pv_dbridge_id) 748 return (INFO_BETTER); 749 if (cpv->pv_dbridge_id > pv->pv_dbridge_id) 750 return (INFO_WORSE); 751 752 if (cpv->pv_dport_id < pv->pv_dport_id) 753 return (INFO_BETTER); 754 if (cpv->pv_dport_id > pv->pv_dport_id) 755 return (INFO_WORSE); 756 757 return (INFO_SAME); 758 } 759 760 /* 761 * This message priority vector is superior to the port priority vector and 762 * will replace it if, and only if, the message priority vector is better than 763 * the port priority vector, or the message has been transmitted from the same 764 * designated bridge and designated port as the port priority vector. 765 */ 766 static int 767 bstp_info_superior(struct bstp_pri_vector *pv, 768 struct bstp_pri_vector *cpv) 769 { 770 if (bstp_info_cmp(pv, cpv) == INFO_BETTER || 771 (bstp_same_bridgeid(pv->pv_dbridge_id, cpv->pv_dbridge_id) && 772 (cpv->pv_dport_id & 0xfff) == (pv->pv_dport_id & 0xfff))) 773 return (1); 774 return (0); 775 } 776 777 static void 778 bstp_assign_roles(struct bstp_state *bs) 779 { 780 struct bstp_port *bp, *rbp = NULL; 781 struct bstp_pri_vector pv; 782 783 /* default to our priority vector */ 784 bs->bs_root_pv = bs->bs_bridge_pv; 785 bs->bs_root_msg_age = 0; 786 bs->bs_root_max_age = bs->bs_bridge_max_age; 787 bs->bs_root_fdelay = bs->bs_bridge_fdelay; 788 bs->bs_root_htime = bs->bs_bridge_htime; 789 bs->bs_root_port = NULL; 790 791 /* check if any recieved info supersedes us */ 792 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 793 if (bp->bp_infois != BSTP_INFO_RECEIVED) 794 continue; 795 796 pv = bp->bp_port_pv; 797 pv.pv_cost += bp->bp_path_cost; 798 799 /* 800 * The root priority vector is the best of the set comprising 801 * the bridge priority vector plus all root path priority 802 * vectors whose bridge address is not equal to us. 803 */ 804 if (bstp_same_bridgeid(pv.pv_dbridge_id, 805 bs->bs_bridge_pv.pv_dbridge_id) == 0 && 806 bstp_info_cmp(&bs->bs_root_pv, &pv) == INFO_BETTER) { 807 /* the port vector replaces the root */ 808 bs->bs_root_pv = pv; 809 bs->bs_root_msg_age = bp->bp_port_msg_age + 810 BSTP_MESSAGE_AGE_INCR; 811 bs->bs_root_max_age = bp->bp_port_max_age; 812 bs->bs_root_fdelay = bp->bp_port_fdelay; 813 bs->bs_root_htime = bp->bp_port_htime; 814 rbp = bp; 815 } 816 } 817 818 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 819 /* calculate the port designated vector */ 820 bp->bp_desg_pv.pv_root_id = bs->bs_root_pv.pv_root_id; 821 bp->bp_desg_pv.pv_cost = bs->bs_root_pv.pv_cost; 822 bp->bp_desg_pv.pv_dbridge_id = bs->bs_bridge_pv.pv_dbridge_id; 823 bp->bp_desg_pv.pv_dport_id = bp->bp_port_id; 824 bp->bp_desg_pv.pv_port_id = bp->bp_port_id; 825 826 /* calculate designated times */ 827 bp->bp_desg_msg_age = bs->bs_root_msg_age; 828 bp->bp_desg_max_age = bs->bs_root_max_age; 829 bp->bp_desg_fdelay = bs->bs_root_fdelay; 830 bp->bp_desg_htime = bs->bs_bridge_htime; 831 832 833 switch (bp->bp_infois) { 834 case BSTP_INFO_DISABLED: 835 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 836 break; 837 838 case BSTP_INFO_AGED: 839 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 840 bstp_update_info(bp); 841 break; 842 843 case BSTP_INFO_MINE: 844 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 845 /* update the port info if stale */ 846 if (bstp_info_cmp(&bp->bp_port_pv, 847 &bp->bp_desg_pv) != INFO_SAME || 848 (rbp != NULL && 849 (bp->bp_port_msg_age != rbp->bp_port_msg_age || 850 bp->bp_port_max_age != rbp->bp_port_max_age || 851 bp->bp_port_fdelay != rbp->bp_port_fdelay || 852 bp->bp_port_htime != rbp->bp_port_htime))) 853 bstp_update_info(bp); 854 break; 855 856 case BSTP_INFO_RECEIVED: 857 if (bp == rbp) { 858 /* 859 * root priority is derived from this 860 * port, make it the root port. 861 */ 862 bstp_set_port_role(bp, BSTP_ROLE_ROOT); 863 bs->bs_root_port = bp; 864 } else if (bstp_info_cmp(&bp->bp_port_pv, 865 &bp->bp_desg_pv) == INFO_BETTER) { 866 /* 867 * the port priority is lower than the root 868 * port. 869 */ 870 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 871 bstp_update_info(bp); 872 } else { 873 if (bstp_same_bridgeid( 874 bp->bp_port_pv.pv_dbridge_id, 875 bs->bs_bridge_pv.pv_dbridge_id)) { 876 /* 877 * the designated bridge refers to 878 * another port on this bridge. 879 */ 880 bstp_set_port_role(bp, 881 BSTP_ROLE_BACKUP); 882 } else { 883 /* 884 * the port is an inferior path to the 885 * root bridge. 886 */ 887 bstp_set_port_role(bp, 888 BSTP_ROLE_ALTERNATE); 889 } 890 } 891 break; 892 } 893 } 894 } 895 896 static void 897 bstp_update_state(struct bstp_state *bs, struct bstp_port *bp) 898 { 899 struct bstp_port *bp2; 900 int synced; 901 902 BSTP_LOCK_ASSERT(bs); 903 904 /* check if all the ports have syncronised again */ 905 if (!bs->bs_allsynced) { 906 synced = 1; 907 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 908 if (!(bp2->bp_synced || 909 bp2->bp_role == BSTP_ROLE_ROOT)) { 910 synced = 0; 911 break; 912 } 913 } 914 bs->bs_allsynced = synced; 915 } 916 917 bstp_update_roles(bs, bp); 918 bstp_update_tc(bp); 919 } 920 921 static void 922 bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp) 923 { 924 switch (bp->bp_role) { 925 case BSTP_ROLE_DISABLED: 926 /* Clear any flags if set */ 927 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 928 bp->bp_sync = 0; 929 bp->bp_synced = 1; 930 bp->bp_reroot = 0; 931 } 932 break; 933 934 case BSTP_ROLE_ALTERNATE: 935 case BSTP_ROLE_BACKUP: 936 if ((bs->bs_allsynced && !bp->bp_agree) || 937 (bp->bp_proposed && bp->bp_agree)) { 938 bp->bp_proposed = 0; 939 bp->bp_agree = 1; 940 bp->bp_flags |= BSTP_PORT_NEWINFO; 941 DPRINTF("%s -> ALTERNATE_AGREED\n", 942 bp->bp_ifp->if_xname); 943 } 944 945 if (bp->bp_proposed && !bp->bp_agree) { 946 bstp_set_all_sync(bs); 947 bp->bp_proposed = 0; 948 DPRINTF("%s -> ALTERNATE_PROPOSED\n", 949 bp->bp_ifp->if_xname); 950 } 951 952 /* Clear any flags if set */ 953 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 954 bp->bp_sync = 0; 955 bp->bp_synced = 1; 956 bp->bp_reroot = 0; 957 DPRINTF("%s -> ALTERNATE_PORT\n", bp->bp_ifp->if_xname); 958 } 959 break; 960 961 case BSTP_ROLE_ROOT: 962 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) { 963 bstp_set_all_reroot(bs); 964 DPRINTF("%s -> ROOT_REROOT\n", bp->bp_ifp->if_xname); 965 } 966 967 if ((bs->bs_allsynced && !bp->bp_agree) || 968 (bp->bp_proposed && bp->bp_agree)) { 969 bp->bp_proposed = 0; 970 bp->bp_sync = 0; 971 bp->bp_agree = 1; 972 bp->bp_flags |= BSTP_PORT_NEWINFO; 973 DPRINTF("%s -> ROOT_AGREED\n", bp->bp_ifp->if_xname); 974 } 975 976 if (bp->bp_proposed && !bp->bp_agree) { 977 bstp_set_all_sync(bs); 978 bp->bp_proposed = 0; 979 DPRINTF("%s -> ROOT_PROPOSED\n", bp->bp_ifp->if_xname); 980 } 981 982 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 983 (bp->bp_forward_delay_timer.active == 0 || 984 (bstp_rerooted(bs, bp) && 985 bp->bp_recent_backup_timer.active == 0 && 986 bp->bp_protover == BSTP_PROTO_RSTP))) { 987 switch (bp->bp_state) { 988 case BSTP_IFSTATE_DISCARDING: 989 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 990 break; 991 case BSTP_IFSTATE_LEARNING: 992 bstp_set_port_state(bp, 993 BSTP_IFSTATE_FORWARDING); 994 break; 995 } 996 } 997 998 if (bp->bp_state == BSTP_IFSTATE_FORWARDING && bp->bp_reroot) { 999 bp->bp_reroot = 0; 1000 DPRINTF("%s -> ROOT_REROOTED\n", bp->bp_ifp->if_xname); 1001 } 1002 break; 1003 1004 case BSTP_ROLE_DESIGNATED: 1005 if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) { 1006 bp->bp_reroot = 0; 1007 DPRINTF("%s -> DESIGNATED_RETIRED\n", 1008 bp->bp_ifp->if_xname); 1009 } 1010 1011 if ((bp->bp_state == BSTP_IFSTATE_DISCARDING && 1012 !bp->bp_synced) || (bp->bp_agreed && !bp->bp_synced) || 1013 (bp->bp_operedge && !bp->bp_synced) || 1014 (bp->bp_sync && bp->bp_synced)) { 1015 bstp_timer_stop(&bp->bp_recent_root_timer); 1016 bp->bp_synced = 1; 1017 bp->bp_sync = 0; 1018 DPRINTF("%s -> DESIGNATED_SYNCED\n", 1019 bp->bp_ifp->if_xname); 1020 } 1021 1022 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1023 !bp->bp_agreed && !bp->bp_proposing && 1024 !bp->bp_operedge) { 1025 bp->bp_proposing = 1; 1026 bp->bp_flags |= BSTP_PORT_NEWINFO; 1027 bstp_timer_start(&bp->bp_edge_delay_timer, 1028 (bp->bp_ptp_link ? BSTP_DEFAULT_MIGRATE_DELAY : 1029 bp->bp_desg_max_age)); 1030 DPRINTF("%s -> DESIGNATED_PROPOSE\n", 1031 bp->bp_ifp->if_xname); 1032 } 1033 1034 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1035 (bp->bp_forward_delay_timer.active == 0 || bp->bp_agreed || 1036 bp->bp_operedge) && 1037 (bp->bp_recent_root_timer.active == 0 || !bp->bp_reroot) && 1038 !bp->bp_sync) { 1039 if (bp->bp_agreed) 1040 DPRINTF("%s -> AGREED\n", bp->bp_ifp->if_xname); 1041 /* 1042 * If agreed|operedge then go straight to forwarding, 1043 * otherwise follow discard -> learn -> forward. 1044 */ 1045 if (bp->bp_agreed || bp->bp_operedge || 1046 bp->bp_state == BSTP_IFSTATE_LEARNING) { 1047 bstp_set_port_state(bp, 1048 BSTP_IFSTATE_FORWARDING); 1049 bp->bp_agreed = bp->bp_protover; 1050 } else if (bp->bp_state == BSTP_IFSTATE_DISCARDING) 1051 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 1052 } 1053 1054 if (((bp->bp_sync && !bp->bp_synced) || 1055 (bp->bp_reroot && bp->bp_recent_root_timer.active) || 1056 (bp->bp_flags & BSTP_PORT_DISPUTED)) && !bp->bp_operedge && 1057 bp->bp_state != BSTP_IFSTATE_DISCARDING) { 1058 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1059 bp->bp_flags &= ~BSTP_PORT_DISPUTED; 1060 bstp_timer_start(&bp->bp_forward_delay_timer, 1061 bp->bp_protover == BSTP_PROTO_RSTP ? 1062 bp->bp_desg_htime : bp->bp_desg_fdelay); 1063 DPRINTF("%s -> DESIGNATED_DISCARD\n", 1064 bp->bp_ifp->if_xname); 1065 } 1066 break; 1067 } 1068 1069 if (bp->bp_flags & BSTP_PORT_NEWINFO) 1070 bstp_transmit(bs, bp); 1071 } 1072 1073 static void 1074 bstp_update_tc(struct bstp_port *bp) 1075 { 1076 switch (bp->bp_tcstate) { 1077 case BSTP_TCSTATE_ACTIVE: 1078 if ((bp->bp_role != BSTP_ROLE_DESIGNATED && 1079 bp->bp_role != BSTP_ROLE_ROOT) || bp->bp_operedge) 1080 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1081 1082 if (bp->bp_rcvdtcn) 1083 bstp_set_port_tc(bp, BSTP_TCSTATE_TCN); 1084 if (bp->bp_rcvdtc) 1085 bstp_set_port_tc(bp, BSTP_TCSTATE_TC); 1086 1087 if (bp->bp_tc_prop && !bp->bp_operedge) 1088 bstp_set_port_tc(bp, BSTP_TCSTATE_PROPAG); 1089 1090 if (bp->bp_rcvdtca) 1091 bstp_set_port_tc(bp, BSTP_TCSTATE_ACK); 1092 break; 1093 1094 case BSTP_TCSTATE_INACTIVE: 1095 if ((bp->bp_state == BSTP_IFSTATE_LEARNING || 1096 bp->bp_state == BSTP_IFSTATE_FORWARDING) && 1097 bp->bp_fdbflush == 0) 1098 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1099 break; 1100 1101 case BSTP_TCSTATE_LEARNING: 1102 if (bp->bp_rcvdtc || bp->bp_rcvdtcn || bp->bp_rcvdtca || 1103 bp->bp_tc_prop) 1104 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1105 else if (bp->bp_role != BSTP_ROLE_DESIGNATED && 1106 bp->bp_role != BSTP_ROLE_ROOT && 1107 bp->bp_state == BSTP_IFSTATE_DISCARDING) 1108 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1109 1110 if ((bp->bp_role == BSTP_ROLE_DESIGNATED || 1111 bp->bp_role == BSTP_ROLE_ROOT) && 1112 bp->bp_state == BSTP_IFSTATE_FORWARDING && 1113 !bp->bp_operedge) 1114 bstp_set_port_tc(bp, BSTP_TCSTATE_DETECTED); 1115 break; 1116 1117 /* these are transient states and go straight back to ACTIVE */ 1118 case BSTP_TCSTATE_DETECTED: 1119 case BSTP_TCSTATE_TCN: 1120 case BSTP_TCSTATE_TC: 1121 case BSTP_TCSTATE_PROPAG: 1122 case BSTP_TCSTATE_ACK: 1123 DPRINTF("Invalid TC state for %s\n", 1124 bp->bp_ifp->if_xname); 1125 break; 1126 } 1127 1128 } 1129 1130 static void 1131 bstp_update_info(struct bstp_port *bp) 1132 { 1133 struct bstp_state *bs = bp->bp_bs; 1134 1135 bp->bp_proposing = 0; 1136 bp->bp_proposed = 0; 1137 1138 if (bp->bp_agreed && !bstp_pdu_bettersame(bp, BSTP_INFO_MINE)) 1139 bp->bp_agreed = 0; 1140 1141 if (bp->bp_synced && !bp->bp_agreed) { 1142 bp->bp_synced = 0; 1143 bs->bs_allsynced = 0; 1144 } 1145 1146 /* copy the designated pv to the port */ 1147 bp->bp_port_pv = bp->bp_desg_pv; 1148 bp->bp_port_msg_age = bp->bp_desg_msg_age; 1149 bp->bp_port_max_age = bp->bp_desg_max_age; 1150 bp->bp_port_fdelay = bp->bp_desg_fdelay; 1151 bp->bp_port_htime = bp->bp_desg_htime; 1152 bp->bp_infois = BSTP_INFO_MINE; 1153 1154 /* Set transmit flag but do not immediately send */ 1155 bp->bp_flags |= BSTP_PORT_NEWINFO; 1156 } 1157 1158 /* set tcprop on every port other than the caller */ 1159 static void 1160 bstp_set_other_tcprop(struct bstp_port *bp) 1161 { 1162 struct bstp_state *bs = bp->bp_bs; 1163 struct bstp_port *bp2; 1164 1165 BSTP_LOCK_ASSERT(bs); 1166 1167 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1168 if (bp2 == bp) 1169 continue; 1170 bp2->bp_tc_prop = 1; 1171 } 1172 } 1173 1174 static void 1175 bstp_set_all_reroot(struct bstp_state *bs) 1176 { 1177 struct bstp_port *bp; 1178 1179 BSTP_LOCK_ASSERT(bs); 1180 1181 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1182 bp->bp_reroot = 1; 1183 } 1184 1185 static void 1186 bstp_set_all_sync(struct bstp_state *bs) 1187 { 1188 struct bstp_port *bp; 1189 1190 BSTP_LOCK_ASSERT(bs); 1191 1192 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1193 bp->bp_sync = 1; 1194 bp->bp_synced = 0; /* Not explicit in spec */ 1195 } 1196 1197 bs->bs_allsynced = 0; 1198 } 1199 1200 static void 1201 bstp_set_port_state(struct bstp_port *bp, int state) 1202 { 1203 if (bp->bp_state == state) 1204 return; 1205 1206 bp->bp_state = state; 1207 1208 switch (bp->bp_state) { 1209 case BSTP_IFSTATE_DISCARDING: 1210 DPRINTF("state changed to DISCARDING on %s\n", 1211 bp->bp_ifp->if_xname); 1212 break; 1213 1214 case BSTP_IFSTATE_LEARNING: 1215 DPRINTF("state changed to LEARNING on %s\n", 1216 bp->bp_ifp->if_xname); 1217 1218 bstp_timer_start(&bp->bp_forward_delay_timer, 1219 bp->bp_protover == BSTP_PROTO_RSTP ? 1220 bp->bp_desg_htime : bp->bp_desg_fdelay); 1221 break; 1222 1223 case BSTP_IFSTATE_FORWARDING: 1224 DPRINTF("state changed to FORWARDING on %s\n", 1225 bp->bp_ifp->if_xname); 1226 1227 bstp_timer_stop(&bp->bp_forward_delay_timer); 1228 /* Record that we enabled forwarding */ 1229 bp->bp_forward_transitions++; 1230 break; 1231 } 1232 1233 /* notify the parent bridge */ 1234 taskqueue_enqueue(taskqueue_swi, &bp->bp_statetask); 1235 } 1236 1237 static void 1238 bstp_set_port_role(struct bstp_port *bp, int role) 1239 { 1240 struct bstp_state *bs = bp->bp_bs; 1241 1242 if (bp->bp_role == role) 1243 return; 1244 1245 /* perform pre-change tasks */ 1246 switch (bp->bp_role) { 1247 case BSTP_ROLE_DISABLED: 1248 bstp_timer_start(&bp->bp_forward_delay_timer, 1249 bp->bp_desg_max_age); 1250 break; 1251 1252 case BSTP_ROLE_BACKUP: 1253 bstp_timer_start(&bp->bp_recent_backup_timer, 1254 bp->bp_desg_htime * 2); 1255 /* fall through */ 1256 case BSTP_ROLE_ALTERNATE: 1257 bstp_timer_start(&bp->bp_forward_delay_timer, 1258 bp->bp_desg_fdelay); 1259 bp->bp_sync = 0; 1260 bp->bp_synced = 1; 1261 bp->bp_reroot = 0; 1262 break; 1263 1264 case BSTP_ROLE_ROOT: 1265 bstp_timer_start(&bp->bp_recent_root_timer, 1266 BSTP_DEFAULT_FORWARD_DELAY); 1267 break; 1268 } 1269 1270 bp->bp_role = role; 1271 /* clear values not carried between roles */ 1272 bp->bp_proposing = 0; 1273 bs->bs_allsynced = 0; 1274 1275 /* initialise the new role */ 1276 switch (bp->bp_role) { 1277 case BSTP_ROLE_DISABLED: 1278 case BSTP_ROLE_ALTERNATE: 1279 case BSTP_ROLE_BACKUP: 1280 DPRINTF("%s role -> ALT/BACK/DISABLED\n", 1281 bp->bp_ifp->if_xname); 1282 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1283 bstp_timer_stop(&bp->bp_recent_root_timer); 1284 bstp_timer_latch(&bp->bp_forward_delay_timer); 1285 bp->bp_sync = 0; 1286 bp->bp_synced = 1; 1287 bp->bp_reroot = 0; 1288 break; 1289 1290 case BSTP_ROLE_ROOT: 1291 DPRINTF("%s role -> ROOT\n", 1292 bp->bp_ifp->if_xname); 1293 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1294 bstp_timer_latch(&bp->bp_recent_root_timer); 1295 bp->bp_proposing = 0; 1296 break; 1297 1298 case BSTP_ROLE_DESIGNATED: 1299 DPRINTF("%s role -> DESIGNATED\n", 1300 bp->bp_ifp->if_xname); 1301 bstp_timer_start(&bp->bp_hello_timer, 1302 bp->bp_desg_htime); 1303 bp->bp_agree = 0; 1304 break; 1305 } 1306 1307 /* let the TC state know that the role changed */ 1308 bstp_update_tc(bp); 1309 } 1310 1311 static void 1312 bstp_set_port_proto(struct bstp_port *bp, int proto) 1313 { 1314 struct bstp_state *bs = bp->bp_bs; 1315 1316 /* supported protocol versions */ 1317 switch (proto) { 1318 case BSTP_PROTO_STP: 1319 /* we can downgrade protocols only */ 1320 bstp_timer_stop(&bp->bp_migrate_delay_timer); 1321 /* clear unsupported features */ 1322 bp->bp_operedge = 0; 1323 /* STP compat mode only uses 16 bits of the 32 */ 1324 if (bp->bp_path_cost > 65535) 1325 bp->bp_path_cost = 65535; 1326 break; 1327 1328 case BSTP_PROTO_RSTP: 1329 bstp_timer_start(&bp->bp_migrate_delay_timer, 1330 bs->bs_migration_delay); 1331 break; 1332 1333 default: 1334 DPRINTF("Unsupported STP version %d\n", proto); 1335 return; 1336 } 1337 1338 bp->bp_protover = proto; 1339 bp->bp_flags &= ~BSTP_PORT_CANMIGRATE; 1340 } 1341 1342 static void 1343 bstp_set_port_tc(struct bstp_port *bp, int state) 1344 { 1345 struct bstp_state *bs = bp->bp_bs; 1346 1347 bp->bp_tcstate = state; 1348 1349 /* initialise the new state */ 1350 switch (bp->bp_tcstate) { 1351 case BSTP_TCSTATE_ACTIVE: 1352 DPRINTF("%s -> TC_ACTIVE\n", bp->bp_ifp->if_xname); 1353 /* nothing to do */ 1354 break; 1355 1356 case BSTP_TCSTATE_INACTIVE: 1357 bstp_timer_stop(&bp->bp_tc_timer); 1358 /* flush routes on the parent bridge */ 1359 bp->bp_fdbflush = 1; 1360 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask); 1361 bp->bp_tc_ack = 0; 1362 DPRINTF("%s -> TC_INACTIVE\n", bp->bp_ifp->if_xname); 1363 break; 1364 1365 case BSTP_TCSTATE_LEARNING: 1366 bp->bp_rcvdtc = 0; 1367 bp->bp_rcvdtcn = 0; 1368 bp->bp_rcvdtca = 0; 1369 bp->bp_tc_prop = 0; 1370 DPRINTF("%s -> TC_LEARNING\n", bp->bp_ifp->if_xname); 1371 break; 1372 1373 case BSTP_TCSTATE_DETECTED: 1374 bstp_set_timer_tc(bp); 1375 bstp_set_other_tcprop(bp); 1376 /* send out notification */ 1377 bp->bp_flags |= BSTP_PORT_NEWINFO; 1378 bstp_transmit(bs, bp); 1379 getmicrotime(&bs->bs_last_tc_time); 1380 DPRINTF("%s -> TC_DETECTED\n", bp->bp_ifp->if_xname); 1381 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1382 break; 1383 1384 case BSTP_TCSTATE_TCN: 1385 bstp_set_timer_tc(bp); 1386 DPRINTF("%s -> TC_TCN\n", bp->bp_ifp->if_xname); 1387 /* fall through */ 1388 case BSTP_TCSTATE_TC: 1389 bp->bp_rcvdtc = 0; 1390 bp->bp_rcvdtcn = 0; 1391 if (bp->bp_role == BSTP_ROLE_DESIGNATED) 1392 bp->bp_tc_ack = 1; 1393 1394 bstp_set_other_tcprop(bp); 1395 DPRINTF("%s -> TC_TC\n", bp->bp_ifp->if_xname); 1396 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1397 break; 1398 1399 case BSTP_TCSTATE_PROPAG: 1400 /* flush routes on the parent bridge */ 1401 bp->bp_fdbflush = 1; 1402 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask); 1403 bp->bp_tc_prop = 0; 1404 bstp_set_timer_tc(bp); 1405 DPRINTF("%s -> TC_PROPAG\n", bp->bp_ifp->if_xname); 1406 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1407 break; 1408 1409 case BSTP_TCSTATE_ACK: 1410 bstp_timer_stop(&bp->bp_tc_timer); 1411 bp->bp_rcvdtca = 0; 1412 DPRINTF("%s -> TC_ACK\n", bp->bp_ifp->if_xname); 1413 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1414 break; 1415 } 1416 } 1417 1418 static void 1419 bstp_set_timer_tc(struct bstp_port *bp) 1420 { 1421 struct bstp_state *bs = bp->bp_bs; 1422 1423 if (bp->bp_tc_timer.active) 1424 return; 1425 1426 switch (bp->bp_protover) { 1427 case BSTP_PROTO_RSTP: 1428 bstp_timer_start(&bp->bp_tc_timer, 1429 bp->bp_desg_htime + BSTP_TICK_VAL); 1430 bp->bp_flags |= BSTP_PORT_NEWINFO; 1431 break; 1432 1433 case BSTP_PROTO_STP: 1434 bstp_timer_start(&bp->bp_tc_timer, 1435 bs->bs_root_max_age + bs->bs_root_fdelay); 1436 break; 1437 } 1438 } 1439 1440 static void 1441 bstp_set_timer_msgage(struct bstp_port *bp) 1442 { 1443 if (bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR <= 1444 bp->bp_port_max_age) { 1445 bstp_timer_start(&bp->bp_message_age_timer, 1446 bp->bp_port_htime * 3); 1447 } else 1448 /* expires immediately */ 1449 bstp_timer_start(&bp->bp_message_age_timer, 0); 1450 } 1451 1452 static int 1453 bstp_rerooted(struct bstp_state *bs, struct bstp_port *bp) 1454 { 1455 struct bstp_port *bp2; 1456 int rr_set = 0; 1457 1458 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1459 if (bp2 == bp) 1460 continue; 1461 if (bp2->bp_recent_root_timer.active) { 1462 rr_set = 1; 1463 break; 1464 } 1465 } 1466 return (!rr_set); 1467 } 1468 1469 int 1470 bstp_set_htime(struct bstp_state *bs, int t) 1471 { 1472 /* convert seconds to ticks */ 1473 t *= BSTP_TICK_VAL; 1474 1475 /* value can only be changed in leagacy stp mode */ 1476 if (bs->bs_protover != BSTP_PROTO_STP) 1477 return (EPERM); 1478 1479 if (t < BSTP_MIN_HELLO_TIME || t > BSTP_MAX_HELLO_TIME) 1480 return (EINVAL); 1481 1482 BSTP_LOCK(bs); 1483 bs->bs_bridge_htime = t; 1484 bstp_reinit(bs); 1485 BSTP_UNLOCK(bs); 1486 return (0); 1487 } 1488 1489 int 1490 bstp_set_fdelay(struct bstp_state *bs, int t) 1491 { 1492 /* convert seconds to ticks */ 1493 t *= BSTP_TICK_VAL; 1494 1495 if (t < BSTP_MIN_FORWARD_DELAY || t > BSTP_MAX_FORWARD_DELAY) 1496 return (EINVAL); 1497 1498 BSTP_LOCK(bs); 1499 bs->bs_bridge_fdelay = t; 1500 bstp_reinit(bs); 1501 BSTP_UNLOCK(bs); 1502 return (0); 1503 } 1504 1505 int 1506 bstp_set_maxage(struct bstp_state *bs, int t) 1507 { 1508 /* convert seconds to ticks */ 1509 t *= BSTP_TICK_VAL; 1510 1511 if (t < BSTP_MIN_MAX_AGE || t > BSTP_MAX_MAX_AGE) 1512 return (EINVAL); 1513 1514 BSTP_LOCK(bs); 1515 bs->bs_bridge_max_age = t; 1516 bstp_reinit(bs); 1517 BSTP_UNLOCK(bs); 1518 return (0); 1519 } 1520 1521 int 1522 bstp_set_holdcount(struct bstp_state *bs, int count) 1523 { 1524 struct bstp_port *bp; 1525 1526 if (count < BSTP_MIN_HOLD_COUNT || 1527 count > BSTP_MAX_HOLD_COUNT) 1528 return (EINVAL); 1529 1530 BSTP_LOCK(bs); 1531 bs->bs_txholdcount = count; 1532 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1533 bp->bp_txcount = 0; 1534 BSTP_UNLOCK(bs); 1535 return (0); 1536 } 1537 1538 int 1539 bstp_set_protocol(struct bstp_state *bs, int proto) 1540 { 1541 struct bstp_port *bp; 1542 1543 switch (proto) { 1544 /* Supported protocol versions */ 1545 case BSTP_PROTO_STP: 1546 case BSTP_PROTO_RSTP: 1547 break; 1548 1549 default: 1550 return (EINVAL); 1551 } 1552 1553 BSTP_LOCK(bs); 1554 bs->bs_protover = proto; 1555 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 1556 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1557 /* reinit state */ 1558 bp->bp_infois = BSTP_INFO_DISABLED; 1559 bp->bp_txcount = 0; 1560 bstp_set_port_proto(bp, bs->bs_protover); 1561 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 1562 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1563 bstp_timer_stop(&bp->bp_recent_backup_timer); 1564 } 1565 bstp_reinit(bs); 1566 BSTP_UNLOCK(bs); 1567 return (0); 1568 } 1569 1570 int 1571 bstp_set_priority(struct bstp_state *bs, int pri) 1572 { 1573 if (pri < 0 || pri > BSTP_MAX_PRIORITY) 1574 return (EINVAL); 1575 1576 /* Limit to steps of 4096 */ 1577 pri -= pri % 4096; 1578 1579 BSTP_LOCK(bs); 1580 bs->bs_bridge_priority = pri; 1581 bstp_reinit(bs); 1582 BSTP_UNLOCK(bs); 1583 return (0); 1584 } 1585 1586 int 1587 bstp_set_port_priority(struct bstp_port *bp, int pri) 1588 { 1589 struct bstp_state *bs = bp->bp_bs; 1590 1591 if (pri < 0 || pri > BSTP_MAX_PORT_PRIORITY) 1592 return (EINVAL); 1593 1594 /* Limit to steps of 16 */ 1595 pri -= pri % 16; 1596 1597 BSTP_LOCK(bs); 1598 bp->bp_priority = pri; 1599 bstp_reinit(bs); 1600 BSTP_UNLOCK(bs); 1601 return (0); 1602 } 1603 1604 int 1605 bstp_set_path_cost(struct bstp_port *bp, uint32_t path_cost) 1606 { 1607 struct bstp_state *bs = bp->bp_bs; 1608 1609 if (path_cost > BSTP_MAX_PATH_COST) 1610 return (EINVAL); 1611 1612 /* STP compat mode only uses 16 bits of the 32 */ 1613 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1614 path_cost = 65535; 1615 1616 BSTP_LOCK(bs); 1617 1618 if (path_cost == 0) { /* use auto */ 1619 bp->bp_flags &= ~BSTP_PORT_ADMCOST; 1620 bp->bp_path_cost = bstp_calc_path_cost(bp); 1621 } else { 1622 bp->bp_path_cost = path_cost; 1623 bp->bp_flags |= BSTP_PORT_ADMCOST; 1624 } 1625 bstp_reinit(bs); 1626 BSTP_UNLOCK(bs); 1627 return (0); 1628 } 1629 1630 int 1631 bstp_set_edge(struct bstp_port *bp, int set) 1632 { 1633 struct bstp_state *bs = bp->bp_bs; 1634 1635 BSTP_LOCK(bs); 1636 if ((bp->bp_operedge = set) == 0) 1637 bp->bp_flags &= ~BSTP_PORT_ADMEDGE; 1638 else 1639 bp->bp_flags |= BSTP_PORT_ADMEDGE; 1640 BSTP_UNLOCK(bs); 1641 return (0); 1642 } 1643 1644 int 1645 bstp_set_autoedge(struct bstp_port *bp, int set) 1646 { 1647 struct bstp_state *bs = bp->bp_bs; 1648 1649 BSTP_LOCK(bs); 1650 if (set) { 1651 bp->bp_flags |= BSTP_PORT_AUTOEDGE; 1652 /* we may be able to transition straight to edge */ 1653 if (bp->bp_edge_delay_timer.active == 0) 1654 bstp_edge_delay_expiry(bs, bp); 1655 } else 1656 bp->bp_flags &= ~BSTP_PORT_AUTOEDGE; 1657 BSTP_UNLOCK(bs); 1658 return (0); 1659 } 1660 1661 int 1662 bstp_set_ptp(struct bstp_port *bp, int set) 1663 { 1664 struct bstp_state *bs = bp->bp_bs; 1665 1666 BSTP_LOCK(bs); 1667 bp->bp_ptp_link = set; 1668 BSTP_UNLOCK(bs); 1669 return (0); 1670 } 1671 1672 int 1673 bstp_set_autoptp(struct bstp_port *bp, int set) 1674 { 1675 struct bstp_state *bs = bp->bp_bs; 1676 1677 BSTP_LOCK(bs); 1678 if (set) { 1679 bp->bp_flags |= BSTP_PORT_AUTOPTP; 1680 if (bp->bp_role != BSTP_ROLE_DISABLED) 1681 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 1682 } else 1683 bp->bp_flags &= ~BSTP_PORT_AUTOPTP; 1684 BSTP_UNLOCK(bs); 1685 return (0); 1686 } 1687 1688 /* 1689 * Calculate the path cost according to the link speed. 1690 */ 1691 static uint32_t 1692 bstp_calc_path_cost(struct bstp_port *bp) 1693 { 1694 struct ifnet *ifp = bp->bp_ifp; 1695 uint32_t path_cost; 1696 1697 /* If the priority has been manually set then retain the value */ 1698 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1699 return bp->bp_path_cost; 1700 1701 if (ifp->if_link_state == LINK_STATE_DOWN) { 1702 /* Recalc when the link comes up again */ 1703 bp->bp_flags |= BSTP_PORT_PNDCOST; 1704 return (BSTP_DEFAULT_PATH_COST); 1705 } 1706 1707 if (ifp->if_baudrate < 1000) 1708 return (BSTP_DEFAULT_PATH_COST); 1709 1710 /* formula from section 17.14, IEEE Std 802.1D-2004 */ 1711 path_cost = 20000000000ULL / (ifp->if_baudrate / 1000); 1712 1713 if (path_cost > BSTP_MAX_PATH_COST) 1714 path_cost = BSTP_MAX_PATH_COST; 1715 1716 /* STP compat mode only uses 16 bits of the 32 */ 1717 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1718 path_cost = 65535; 1719 1720 return (path_cost); 1721 } 1722 1723 /* 1724 * Notify the bridge that a port state has changed, we need to do this from a 1725 * taskqueue to avoid a LOR. 1726 */ 1727 static void 1728 bstp_notify_state(void *arg, int pending) 1729 { 1730 struct bstp_port *bp = (struct bstp_port *)arg; 1731 struct bstp_state *bs = bp->bp_bs; 1732 1733 if (bp->bp_active == 1 && bs->bs_state_cb != NULL) 1734 (*bs->bs_state_cb)(bp->bp_ifp, bp->bp_state); 1735 } 1736 1737 /* 1738 * Flush the routes on the bridge port, we need to do this from a 1739 * taskqueue to avoid a LOR. 1740 */ 1741 static void 1742 bstp_notify_rtage(void *arg, int pending) 1743 { 1744 struct bstp_port *bp = (struct bstp_port *)arg; 1745 struct bstp_state *bs = bp->bp_bs; 1746 int age = 0; 1747 1748 BSTP_LOCK(bs); 1749 switch (bp->bp_protover) { 1750 case BSTP_PROTO_STP: 1751 /* convert to seconds */ 1752 age = bp->bp_desg_fdelay / BSTP_TICK_VAL; 1753 break; 1754 1755 case BSTP_PROTO_RSTP: 1756 age = 0; 1757 break; 1758 } 1759 BSTP_UNLOCK(bs); 1760 1761 if (bp->bp_active == 1 && bs->bs_rtage_cb != NULL) 1762 (*bs->bs_rtage_cb)(bp->bp_ifp, age); 1763 1764 /* flush is complete */ 1765 BSTP_LOCK(bs); 1766 bp->bp_fdbflush = 0; 1767 BSTP_UNLOCK(bs); 1768 } 1769 1770 void 1771 bstp_linkstate(struct bstp_port *bp) 1772 { 1773 struct bstp_state *bs = bp->bp_bs; 1774 1775 if (!bp->bp_active) 1776 return; 1777 1778 bstp_ifupdstatus(bp, 0); 1779 BSTP_LOCK(bs); 1780 bstp_update_state(bs, bp); 1781 BSTP_UNLOCK(bs); 1782 } 1783 1784 static void 1785 bstp_ifupdstatus(void *arg, int pending) 1786 { 1787 struct bstp_port *bp = (struct bstp_port *)arg; 1788 struct bstp_state *bs = bp->bp_bs; 1789 struct ifnet *ifp = bp->bp_ifp; 1790 struct ifmediareq ifmr; 1791 int error, changed; 1792 1793 if (!bp->bp_active) 1794 return; 1795 1796 bzero((char *)&ifmr, sizeof(ifmr)); 1797 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr); 1798 1799 BSTP_LOCK(bs); 1800 changed = 0; 1801 if ((error == 0) && (ifp->if_flags & IFF_UP)) { 1802 if (ifmr.ifm_status & IFM_ACTIVE) { 1803 /* A full-duplex link is assumed to be point to point */ 1804 if (bp->bp_flags & BSTP_PORT_AUTOPTP) { 1805 int fdx; 1806 1807 fdx = ifmr.ifm_active & IFM_FDX ? 1 : 0; 1808 if (bp->bp_ptp_link ^ fdx) { 1809 bp->bp_ptp_link = fdx; 1810 changed = 1; 1811 } 1812 } 1813 1814 /* Calc the cost if the link was down previously */ 1815 if (bp->bp_flags & BSTP_PORT_PNDCOST) { 1816 uint32_t cost; 1817 1818 cost = bstp_calc_path_cost(bp); 1819 if (bp->bp_path_cost != cost) { 1820 bp->bp_path_cost = cost; 1821 changed = 1; 1822 } 1823 bp->bp_flags &= ~BSTP_PORT_PNDCOST; 1824 } 1825 1826 if (bp->bp_role == BSTP_ROLE_DISABLED) { 1827 bstp_enable_port(bs, bp); 1828 changed = 1; 1829 } 1830 } else { 1831 if (bp->bp_role != BSTP_ROLE_DISABLED) { 1832 bstp_disable_port(bs, bp); 1833 changed = 1; 1834 if ((bp->bp_flags & BSTP_PORT_ADMEDGE) && 1835 bp->bp_protover == BSTP_PROTO_RSTP) 1836 bp->bp_operedge = 1; 1837 } 1838 } 1839 } else if (bp->bp_infois != BSTP_INFO_DISABLED) { 1840 bstp_disable_port(bs, bp); 1841 changed = 1; 1842 } 1843 if (changed) 1844 bstp_assign_roles(bs); 1845 BSTP_UNLOCK(bs); 1846 } 1847 1848 static void 1849 bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp) 1850 { 1851 bp->bp_infois = BSTP_INFO_AGED; 1852 } 1853 1854 static void 1855 bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp) 1856 { 1857 bp->bp_infois = BSTP_INFO_DISABLED; 1858 } 1859 1860 static void 1861 bstp_tick(void *arg) 1862 { 1863 struct bstp_state *bs = arg; 1864 struct bstp_port *bp; 1865 1866 BSTP_LOCK_ASSERT(bs); 1867 1868 if (bs->bs_running == 0) 1869 return; 1870 1871 CURVNET_SET(bs->bs_vnet); 1872 1873 /* poll link events on interfaces that do not support linkstate */ 1874 if (bstp_timer_dectest(&bs->bs_link_timer)) { 1875 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1876 if (!(bp->bp_ifp->if_capabilities & IFCAP_LINKSTATE)) 1877 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 1878 } 1879 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 1880 } 1881 1882 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1883 /* no events need to happen for these */ 1884 bstp_timer_dectest(&bp->bp_tc_timer); 1885 bstp_timer_dectest(&bp->bp_recent_root_timer); 1886 bstp_timer_dectest(&bp->bp_forward_delay_timer); 1887 bstp_timer_dectest(&bp->bp_recent_backup_timer); 1888 1889 if (bstp_timer_dectest(&bp->bp_hello_timer)) 1890 bstp_hello_timer_expiry(bs, bp); 1891 1892 if (bstp_timer_dectest(&bp->bp_message_age_timer)) 1893 bstp_message_age_expiry(bs, bp); 1894 1895 if (bstp_timer_dectest(&bp->bp_migrate_delay_timer)) 1896 bstp_migrate_delay_expiry(bs, bp); 1897 1898 if (bstp_timer_dectest(&bp->bp_edge_delay_timer)) 1899 bstp_edge_delay_expiry(bs, bp); 1900 1901 /* update the various state machines for the port */ 1902 bstp_update_state(bs, bp); 1903 1904 if (bp->bp_txcount > 0) 1905 bp->bp_txcount--; 1906 } 1907 1908 CURVNET_RESTORE(); 1909 1910 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 1911 } 1912 1913 static void 1914 bstp_timer_start(struct bstp_timer *t, uint16_t v) 1915 { 1916 t->value = v; 1917 t->active = 1; 1918 t->latched = 0; 1919 } 1920 1921 static void 1922 bstp_timer_stop(struct bstp_timer *t) 1923 { 1924 t->value = 0; 1925 t->active = 0; 1926 t->latched = 0; 1927 } 1928 1929 static void 1930 bstp_timer_latch(struct bstp_timer *t) 1931 { 1932 t->latched = 1; 1933 t->active = 1; 1934 } 1935 1936 static int 1937 bstp_timer_dectest(struct bstp_timer *t) 1938 { 1939 if (t->active == 0 || t->latched) 1940 return (0); 1941 t->value -= BSTP_TICK_VAL; 1942 if (t->value <= 0) { 1943 bstp_timer_stop(t); 1944 return (1); 1945 } 1946 return (0); 1947 } 1948 1949 static void 1950 bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp) 1951 { 1952 if ((bp->bp_flags & BSTP_PORT_NEWINFO) || 1953 bp->bp_role == BSTP_ROLE_DESIGNATED || 1954 (bp->bp_role == BSTP_ROLE_ROOT && 1955 bp->bp_tc_timer.active == 1)) { 1956 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 1957 bp->bp_flags |= BSTP_PORT_NEWINFO; 1958 bstp_transmit(bs, bp); 1959 } 1960 } 1961 1962 static void 1963 bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp) 1964 { 1965 if (bp->bp_infois == BSTP_INFO_RECEIVED) { 1966 bp->bp_infois = BSTP_INFO_AGED; 1967 bstp_assign_roles(bs); 1968 DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname); 1969 } 1970 } 1971 1972 static void 1973 bstp_migrate_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 1974 { 1975 bp->bp_flags |= BSTP_PORT_CANMIGRATE; 1976 } 1977 1978 static void 1979 bstp_edge_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 1980 { 1981 if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) && 1982 bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing && 1983 bp->bp_role == BSTP_ROLE_DESIGNATED) { 1984 bp->bp_operedge = 1; 1985 DPRINTF("%s -> edge port\n", bp->bp_ifp->if_xname); 1986 } 1987 } 1988 1989 static int 1990 bstp_addr_cmp(const uint8_t *a, const uint8_t *b) 1991 { 1992 int i, d; 1993 1994 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 1995 d = ((int)a[i]) - ((int)b[i]); 1996 } 1997 1998 return (d); 1999 } 2000 2001 /* 2002 * compare the bridge address component of the bridgeid 2003 */ 2004 static int 2005 bstp_same_bridgeid(uint64_t id1, uint64_t id2) 2006 { 2007 u_char addr1[ETHER_ADDR_LEN]; 2008 u_char addr2[ETHER_ADDR_LEN]; 2009 2010 PV2ADDR(id1, addr1); 2011 PV2ADDR(id2, addr2); 2012 2013 if (bstp_addr_cmp(addr1, addr2) == 0) 2014 return (1); 2015 2016 return (0); 2017 } 2018 2019 void 2020 bstp_reinit(struct bstp_state *bs) 2021 { 2022 struct bstp_port *bp; 2023 struct ifnet *ifp, *mif; 2024 u_char *e_addr; 2025 void *bridgeptr; 2026 static const u_char llzero[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 2027 2028 BSTP_LOCK_ASSERT(bs); 2029 2030 if (LIST_EMPTY(&bs->bs_bplist)) 2031 goto disablestp; 2032 2033 mif = NULL; 2034 bridgeptr = LIST_FIRST(&bs->bs_bplist)->bp_ifp->if_bridge; 2035 KASSERT(bridgeptr != NULL, ("Invalid bridge pointer")); 2036 /* 2037 * Search through the Ethernet adapters and find the one with the 2038 * lowest value. Make sure the adapter which we take the MAC address 2039 * from is part of this bridge, so we can have more than one independent 2040 * bridges in the same STP domain. 2041 */ 2042 IFNET_RLOCK_NOSLEEP(); 2043 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2044 if (ifp->if_type != IFT_ETHER) 2045 continue; /* Not Ethernet */ 2046 2047 if (ifp->if_bridge != bridgeptr) 2048 continue; /* Not part of our bridge */ 2049 2050 if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0) 2051 continue; /* No mac address set */ 2052 2053 if (mif == NULL) { 2054 mif = ifp; 2055 continue; 2056 } 2057 if (bstp_addr_cmp(IF_LLADDR(ifp), IF_LLADDR(mif)) < 0) { 2058 mif = ifp; 2059 continue; 2060 } 2061 } 2062 IFNET_RUNLOCK_NOSLEEP(); 2063 if (mif == NULL) 2064 goto disablestp; 2065 2066 e_addr = IF_LLADDR(mif); 2067 bs->bs_bridge_pv.pv_dbridge_id = 2068 (((uint64_t)bs->bs_bridge_priority) << 48) | 2069 (((uint64_t)e_addr[0]) << 40) | 2070 (((uint64_t)e_addr[1]) << 32) | 2071 (((uint64_t)e_addr[2]) << 24) | 2072 (((uint64_t)e_addr[3]) << 16) | 2073 (((uint64_t)e_addr[4]) << 8) | 2074 (((uint64_t)e_addr[5])); 2075 2076 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2077 bs->bs_bridge_pv.pv_cost = 0; 2078 bs->bs_bridge_pv.pv_dport_id = 0; 2079 bs->bs_bridge_pv.pv_port_id = 0; 2080 2081 if (bs->bs_running && callout_pending(&bs->bs_bstpcallout) == 0) 2082 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2083 2084 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2085 bp->bp_port_id = (bp->bp_priority << 8) | 2086 (bp->bp_ifp->if_index & 0xfff); 2087 taskqueue_enqueue(taskqueue_swi, &bp->bp_mediatask); 2088 } 2089 2090 bstp_assign_roles(bs); 2091 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 2092 return; 2093 2094 disablestp: 2095 /* Set the bridge and root id (lower bits) to zero */ 2096 bs->bs_bridge_pv.pv_dbridge_id = 2097 ((uint64_t)bs->bs_bridge_priority) << 48; 2098 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2099 bs->bs_root_pv = bs->bs_bridge_pv; 2100 /* Disable any remaining ports, they will have no MAC address */ 2101 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2102 bp->bp_infois = BSTP_INFO_DISABLED; 2103 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2104 } 2105 callout_stop(&bs->bs_bstpcallout); 2106 } 2107 2108 static int 2109 bstp_modevent(module_t mod, int type, void *data) 2110 { 2111 switch (type) { 2112 case MOD_LOAD: 2113 mtx_init(&bstp_list_mtx, "bridgestp list", NULL, MTX_DEF); 2114 LIST_INIT(&bstp_list); 2115 break; 2116 case MOD_UNLOAD: 2117 mtx_destroy(&bstp_list_mtx); 2118 break; 2119 default: 2120 return (EOPNOTSUPP); 2121 } 2122 return (0); 2123 } 2124 2125 static moduledata_t bstp_mod = { 2126 "bridgestp", 2127 bstp_modevent, 2128 0 2129 }; 2130 2131 DECLARE_MODULE(bridgestp, bstp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2132 MODULE_VERSION(bridgestp, 1); 2133 2134 void 2135 bstp_attach(struct bstp_state *bs, struct bstp_cb_ops *cb) 2136 { 2137 BSTP_LOCK_INIT(bs); 2138 callout_init_mtx(&bs->bs_bstpcallout, &bs->bs_mtx, 0); 2139 LIST_INIT(&bs->bs_bplist); 2140 2141 bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 2142 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 2143 bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY; 2144 bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 2145 bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME; 2146 bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY; 2147 bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT; 2148 bs->bs_protover = BSTP_PROTO_RSTP; 2149 bs->bs_state_cb = cb->bcb_state; 2150 bs->bs_rtage_cb = cb->bcb_rtage; 2151 bs->bs_vnet = curvnet; 2152 2153 getmicrotime(&bs->bs_last_tc_time); 2154 2155 mtx_lock(&bstp_list_mtx); 2156 LIST_INSERT_HEAD(&bstp_list, bs, bs_list); 2157 mtx_unlock(&bstp_list_mtx); 2158 } 2159 2160 void 2161 bstp_detach(struct bstp_state *bs) 2162 { 2163 KASSERT(LIST_EMPTY(&bs->bs_bplist), ("bstp still active")); 2164 2165 mtx_lock(&bstp_list_mtx); 2166 LIST_REMOVE(bs, bs_list); 2167 mtx_unlock(&bstp_list_mtx); 2168 callout_drain(&bs->bs_bstpcallout); 2169 BSTP_LOCK_DESTROY(bs); 2170 } 2171 2172 void 2173 bstp_init(struct bstp_state *bs) 2174 { 2175 BSTP_LOCK(bs); 2176 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2177 bs->bs_running = 1; 2178 bstp_reinit(bs); 2179 BSTP_UNLOCK(bs); 2180 } 2181 2182 void 2183 bstp_stop(struct bstp_state *bs) 2184 { 2185 struct bstp_port *bp; 2186 2187 BSTP_LOCK(bs); 2188 2189 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 2190 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2191 2192 bs->bs_running = 0; 2193 callout_stop(&bs->bs_bstpcallout); 2194 BSTP_UNLOCK(bs); 2195 } 2196 2197 int 2198 bstp_create(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *ifp) 2199 { 2200 bzero(bp, sizeof(struct bstp_port)); 2201 2202 BSTP_LOCK(bs); 2203 bp->bp_ifp = ifp; 2204 bp->bp_bs = bs; 2205 bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY; 2206 TASK_INIT(&bp->bp_statetask, 0, bstp_notify_state, bp); 2207 TASK_INIT(&bp->bp_rtagetask, 0, bstp_notify_rtage, bp); 2208 TASK_INIT(&bp->bp_mediatask, 0, bstp_ifupdstatus, bp); 2209 2210 /* Init state */ 2211 bp->bp_infois = BSTP_INFO_DISABLED; 2212 bp->bp_flags = BSTP_PORT_AUTOEDGE|BSTP_PORT_AUTOPTP; 2213 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2214 bstp_set_port_proto(bp, bs->bs_protover); 2215 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2216 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 2217 bp->bp_path_cost = bstp_calc_path_cost(bp); 2218 BSTP_UNLOCK(bs); 2219 return (0); 2220 } 2221 2222 int 2223 bstp_enable(struct bstp_port *bp) 2224 { 2225 struct bstp_state *bs = bp->bp_bs; 2226 struct ifnet *ifp = bp->bp_ifp; 2227 2228 KASSERT(bp->bp_active == 0, ("already a bstp member")); 2229 2230 switch (ifp->if_type) { 2231 case IFT_ETHER: /* These can do spanning tree. */ 2232 break; 2233 default: 2234 /* Nothing else can. */ 2235 return (EINVAL); 2236 } 2237 2238 BSTP_LOCK(bs); 2239 LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next); 2240 bp->bp_active = 1; 2241 bp->bp_flags |= BSTP_PORT_NEWINFO; 2242 bstp_reinit(bs); 2243 bstp_update_roles(bs, bp); 2244 BSTP_UNLOCK(bs); 2245 return (0); 2246 } 2247 2248 void 2249 bstp_disable(struct bstp_port *bp) 2250 { 2251 struct bstp_state *bs = bp->bp_bs; 2252 2253 KASSERT(bp->bp_active == 1, ("not a bstp member")); 2254 2255 BSTP_LOCK(bs); 2256 bstp_disable_port(bs, bp); 2257 LIST_REMOVE(bp, bp_next); 2258 bp->bp_active = 0; 2259 bstp_reinit(bs); 2260 BSTP_UNLOCK(bs); 2261 } 2262 2263 /* 2264 * The bstp_port structure is about to be freed by the parent bridge. 2265 */ 2266 void 2267 bstp_destroy(struct bstp_port *bp) 2268 { 2269 KASSERT(bp->bp_active == 0, ("port is still attached")); 2270 taskqueue_drain(taskqueue_swi, &bp->bp_statetask); 2271 taskqueue_drain(taskqueue_swi, &bp->bp_rtagetask); 2272 taskqueue_drain(taskqueue_swi, &bp->bp_mediatask); 2273 } 2274