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