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(struct bstp_state *, struct bstp_port *); 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_expired(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 MGETHDR(m, M_DONTWAIT, 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 MGETHDR(m, M_DONTWAIT, 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 struct mbuf * 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 (NULL); 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 return (NULL); 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 bstp_ifupdstatus(bs, bp); 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 ifnet *ifp, int state) 1772 { 1773 struct bstp_state *bs; 1774 struct bstp_port *bp; 1775 1776 /* search for the stp port */ 1777 mtx_lock(&bstp_list_mtx); 1778 LIST_FOREACH(bs, &bstp_list, bs_list) { 1779 BSTP_LOCK(bs); 1780 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1781 if (bp->bp_ifp == ifp) { 1782 bstp_ifupdstatus(bs, bp); 1783 bstp_update_state(bs, bp); 1784 /* it only exists once so return */ 1785 BSTP_UNLOCK(bs); 1786 mtx_unlock(&bstp_list_mtx); 1787 return; 1788 } 1789 } 1790 BSTP_UNLOCK(bs); 1791 } 1792 mtx_unlock(&bstp_list_mtx); 1793 } 1794 1795 static void 1796 bstp_ifupdstatus(struct bstp_state *bs, struct bstp_port *bp) 1797 { 1798 struct ifnet *ifp = bp->bp_ifp; 1799 struct ifmediareq ifmr; 1800 int error = 0; 1801 1802 BSTP_LOCK_ASSERT(bs); 1803 1804 bzero((char *)&ifmr, sizeof(ifmr)); 1805 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr); 1806 1807 if ((error == 0) && (ifp->if_flags & IFF_UP)) { 1808 if (ifmr.ifm_status & IFM_ACTIVE) { 1809 /* A full-duplex link is assumed to be point to point */ 1810 if (bp->bp_flags & BSTP_PORT_AUTOPTP) { 1811 bp->bp_ptp_link = 1812 ifmr.ifm_active & IFM_FDX ? 1 : 0; 1813 } 1814 1815 /* Calc the cost if the link was down previously */ 1816 if (bp->bp_flags & BSTP_PORT_PNDCOST) { 1817 bp->bp_path_cost = bstp_calc_path_cost(bp); 1818 bp->bp_flags &= ~BSTP_PORT_PNDCOST; 1819 } 1820 1821 if (bp->bp_role == BSTP_ROLE_DISABLED) 1822 bstp_enable_port(bs, bp); 1823 } else { 1824 if (bp->bp_role != BSTP_ROLE_DISABLED) { 1825 bstp_disable_port(bs, bp); 1826 if ((bp->bp_flags & BSTP_PORT_ADMEDGE) && 1827 bp->bp_protover == BSTP_PROTO_RSTP) 1828 bp->bp_operedge = 1; 1829 } 1830 } 1831 return; 1832 } 1833 1834 if (bp->bp_infois != BSTP_INFO_DISABLED) 1835 bstp_disable_port(bs, bp); 1836 } 1837 1838 static void 1839 bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp) 1840 { 1841 bp->bp_infois = BSTP_INFO_AGED; 1842 bstp_assign_roles(bs); 1843 } 1844 1845 static void 1846 bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp) 1847 { 1848 bp->bp_infois = BSTP_INFO_DISABLED; 1849 bstp_assign_roles(bs); 1850 } 1851 1852 static void 1853 bstp_tick(void *arg) 1854 { 1855 struct bstp_state *bs = arg; 1856 struct bstp_port *bp; 1857 1858 BSTP_LOCK_ASSERT(bs); 1859 1860 if (bs->bs_running == 0) 1861 return; 1862 1863 CURVNET_SET(bs->bs_vnet); 1864 1865 /* slow timer to catch missed link events */ 1866 if (bstp_timer_expired(&bs->bs_link_timer)) { 1867 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1868 bstp_ifupdstatus(bs, bp); 1869 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 1870 } 1871 1872 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1873 /* no events need to happen for these */ 1874 bstp_timer_expired(&bp->bp_tc_timer); 1875 bstp_timer_expired(&bp->bp_recent_root_timer); 1876 bstp_timer_expired(&bp->bp_forward_delay_timer); 1877 bstp_timer_expired(&bp->bp_recent_backup_timer); 1878 1879 if (bstp_timer_expired(&bp->bp_hello_timer)) 1880 bstp_hello_timer_expiry(bs, bp); 1881 1882 if (bstp_timer_expired(&bp->bp_message_age_timer)) 1883 bstp_message_age_expiry(bs, bp); 1884 1885 if (bstp_timer_expired(&bp->bp_migrate_delay_timer)) 1886 bstp_migrate_delay_expiry(bs, bp); 1887 1888 if (bstp_timer_expired(&bp->bp_edge_delay_timer)) 1889 bstp_edge_delay_expiry(bs, bp); 1890 1891 /* update the various state machines for the port */ 1892 bstp_update_state(bs, bp); 1893 1894 if (bp->bp_txcount > 0) 1895 bp->bp_txcount--; 1896 } 1897 1898 CURVNET_RESTORE(); 1899 1900 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 1901 } 1902 1903 static void 1904 bstp_timer_start(struct bstp_timer *t, uint16_t v) 1905 { 1906 t->value = v; 1907 t->active = 1; 1908 t->latched = 0; 1909 } 1910 1911 static void 1912 bstp_timer_stop(struct bstp_timer *t) 1913 { 1914 t->value = 0; 1915 t->active = 0; 1916 t->latched = 0; 1917 } 1918 1919 static void 1920 bstp_timer_latch(struct bstp_timer *t) 1921 { 1922 t->latched = 1; 1923 t->active = 1; 1924 } 1925 1926 static int 1927 bstp_timer_expired(struct bstp_timer *t) 1928 { 1929 if (t->active == 0 || t->latched) 1930 return (0); 1931 t->value -= BSTP_TICK_VAL; 1932 if (t->value <= 0) { 1933 bstp_timer_stop(t); 1934 return (1); 1935 } 1936 return (0); 1937 } 1938 1939 static void 1940 bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp) 1941 { 1942 if ((bp->bp_flags & BSTP_PORT_NEWINFO) || 1943 bp->bp_role == BSTP_ROLE_DESIGNATED || 1944 (bp->bp_role == BSTP_ROLE_ROOT && 1945 bp->bp_tc_timer.active == 1)) { 1946 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 1947 bp->bp_flags |= BSTP_PORT_NEWINFO; 1948 bstp_transmit(bs, bp); 1949 } 1950 } 1951 1952 static void 1953 bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp) 1954 { 1955 if (bp->bp_infois == BSTP_INFO_RECEIVED) { 1956 bp->bp_infois = BSTP_INFO_AGED; 1957 bstp_assign_roles(bs); 1958 DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname); 1959 } 1960 } 1961 1962 static void 1963 bstp_migrate_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 1964 { 1965 bp->bp_flags |= BSTP_PORT_CANMIGRATE; 1966 } 1967 1968 static void 1969 bstp_edge_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 1970 { 1971 if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) && 1972 bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing && 1973 bp->bp_role == BSTP_ROLE_DESIGNATED) { 1974 bp->bp_operedge = 1; 1975 DPRINTF("%s -> edge port\n", bp->bp_ifp->if_xname); 1976 } 1977 } 1978 1979 static int 1980 bstp_addr_cmp(const uint8_t *a, const uint8_t *b) 1981 { 1982 int i, d; 1983 1984 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 1985 d = ((int)a[i]) - ((int)b[i]); 1986 } 1987 1988 return (d); 1989 } 1990 1991 /* 1992 * compare the bridge address component of the bridgeid 1993 */ 1994 static int 1995 bstp_same_bridgeid(uint64_t id1, uint64_t id2) 1996 { 1997 u_char addr1[ETHER_ADDR_LEN]; 1998 u_char addr2[ETHER_ADDR_LEN]; 1999 2000 PV2ADDR(id1, addr1); 2001 PV2ADDR(id2, addr2); 2002 2003 if (bstp_addr_cmp(addr1, addr2) == 0) 2004 return (1); 2005 2006 return (0); 2007 } 2008 2009 void 2010 bstp_reinit(struct bstp_state *bs) 2011 { 2012 struct bstp_port *bp; 2013 struct ifnet *ifp, *mif; 2014 u_char *e_addr; 2015 static const u_char llzero[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 2016 2017 BSTP_LOCK_ASSERT(bs); 2018 2019 mif = NULL; 2020 /* 2021 * Search through the Ethernet adapters and find the one with the 2022 * lowest value. The adapter which we take the MAC address from does 2023 * not need to be part of the bridge, it just needs to be a unique 2024 * value. 2025 */ 2026 IFNET_RLOCK_NOSLEEP(); 2027 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2028 if (ifp->if_type != IFT_ETHER) 2029 continue; 2030 2031 if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0) 2032 continue; 2033 2034 if (mif == NULL) { 2035 mif = ifp; 2036 continue; 2037 } 2038 if (bstp_addr_cmp(IF_LLADDR(ifp), IF_LLADDR(mif)) < 0) { 2039 mif = ifp; 2040 continue; 2041 } 2042 } 2043 IFNET_RUNLOCK_NOSLEEP(); 2044 2045 if (LIST_EMPTY(&bs->bs_bplist) || mif == NULL) { 2046 /* Set the bridge and root id (lower bits) to zero */ 2047 bs->bs_bridge_pv.pv_dbridge_id = 2048 ((uint64_t)bs->bs_bridge_priority) << 48; 2049 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2050 bs->bs_root_pv = bs->bs_bridge_pv; 2051 /* Disable any remaining ports, they will have no MAC address */ 2052 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2053 bp->bp_infois = BSTP_INFO_DISABLED; 2054 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2055 } 2056 callout_stop(&bs->bs_bstpcallout); 2057 return; 2058 } 2059 2060 e_addr = IF_LLADDR(mif); 2061 bs->bs_bridge_pv.pv_dbridge_id = 2062 (((uint64_t)bs->bs_bridge_priority) << 48) | 2063 (((uint64_t)e_addr[0]) << 40) | 2064 (((uint64_t)e_addr[1]) << 32) | 2065 (((uint64_t)e_addr[2]) << 24) | 2066 (((uint64_t)e_addr[3]) << 16) | 2067 (((uint64_t)e_addr[4]) << 8) | 2068 (((uint64_t)e_addr[5])); 2069 2070 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2071 bs->bs_bridge_pv.pv_cost = 0; 2072 bs->bs_bridge_pv.pv_dport_id = 0; 2073 bs->bs_bridge_pv.pv_port_id = 0; 2074 2075 if (bs->bs_running && callout_pending(&bs->bs_bstpcallout) == 0) 2076 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2077 2078 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2079 bp->bp_port_id = (bp->bp_priority << 8) | 2080 (bp->bp_ifp->if_index & 0xfff); 2081 bstp_ifupdstatus(bs, bp); 2082 } 2083 2084 bstp_assign_roles(bs); 2085 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 2086 } 2087 2088 static int 2089 bstp_modevent(module_t mod, int type, void *data) 2090 { 2091 switch (type) { 2092 case MOD_LOAD: 2093 mtx_init(&bstp_list_mtx, "bridgestp list", NULL, MTX_DEF); 2094 LIST_INIT(&bstp_list); 2095 bstp_linkstate_p = bstp_linkstate; 2096 break; 2097 case MOD_UNLOAD: 2098 bstp_linkstate_p = NULL; 2099 mtx_destroy(&bstp_list_mtx); 2100 break; 2101 default: 2102 return (EOPNOTSUPP); 2103 } 2104 return (0); 2105 } 2106 2107 static moduledata_t bstp_mod = { 2108 "bridgestp", 2109 bstp_modevent, 2110 0 2111 }; 2112 2113 DECLARE_MODULE(bridgestp, bstp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2114 MODULE_VERSION(bridgestp, 1); 2115 2116 void 2117 bstp_attach(struct bstp_state *bs, struct bstp_cb_ops *cb) 2118 { 2119 BSTP_LOCK_INIT(bs); 2120 callout_init_mtx(&bs->bs_bstpcallout, &bs->bs_mtx, 0); 2121 LIST_INIT(&bs->bs_bplist); 2122 2123 bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 2124 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 2125 bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY; 2126 bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 2127 bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME; 2128 bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY; 2129 bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT; 2130 bs->bs_protover = BSTP_PROTO_RSTP; 2131 bs->bs_state_cb = cb->bcb_state; 2132 bs->bs_rtage_cb = cb->bcb_rtage; 2133 bs->bs_vnet = curvnet; 2134 2135 getmicrotime(&bs->bs_last_tc_time); 2136 2137 mtx_lock(&bstp_list_mtx); 2138 LIST_INSERT_HEAD(&bstp_list, bs, bs_list); 2139 mtx_unlock(&bstp_list_mtx); 2140 } 2141 2142 void 2143 bstp_detach(struct bstp_state *bs) 2144 { 2145 KASSERT(LIST_EMPTY(&bs->bs_bplist), ("bstp still active")); 2146 2147 mtx_lock(&bstp_list_mtx); 2148 LIST_REMOVE(bs, bs_list); 2149 mtx_unlock(&bstp_list_mtx); 2150 callout_drain(&bs->bs_bstpcallout); 2151 BSTP_LOCK_DESTROY(bs); 2152 } 2153 2154 void 2155 bstp_init(struct bstp_state *bs) 2156 { 2157 BSTP_LOCK(bs); 2158 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2159 bs->bs_running = 1; 2160 bstp_reinit(bs); 2161 BSTP_UNLOCK(bs); 2162 } 2163 2164 void 2165 bstp_stop(struct bstp_state *bs) 2166 { 2167 struct bstp_port *bp; 2168 2169 BSTP_LOCK(bs); 2170 2171 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 2172 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2173 2174 bs->bs_running = 0; 2175 callout_stop(&bs->bs_bstpcallout); 2176 BSTP_UNLOCK(bs); 2177 } 2178 2179 int 2180 bstp_create(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *ifp) 2181 { 2182 bzero(bp, sizeof(struct bstp_port)); 2183 2184 BSTP_LOCK(bs); 2185 bp->bp_ifp = ifp; 2186 bp->bp_bs = bs; 2187 bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY; 2188 TASK_INIT(&bp->bp_statetask, 0, bstp_notify_state, bp); 2189 TASK_INIT(&bp->bp_rtagetask, 0, bstp_notify_rtage, bp); 2190 2191 /* Init state */ 2192 bp->bp_infois = BSTP_INFO_DISABLED; 2193 bp->bp_flags = BSTP_PORT_AUTOEDGE|BSTP_PORT_AUTOPTP; 2194 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2195 bstp_set_port_proto(bp, bs->bs_protover); 2196 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2197 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 2198 bp->bp_path_cost = bstp_calc_path_cost(bp); 2199 BSTP_UNLOCK(bs); 2200 return (0); 2201 } 2202 2203 int 2204 bstp_enable(struct bstp_port *bp) 2205 { 2206 struct bstp_state *bs = bp->bp_bs; 2207 struct ifnet *ifp = bp->bp_ifp; 2208 2209 KASSERT(bp->bp_active == 0, ("already a bstp member")); 2210 2211 switch (ifp->if_type) { 2212 case IFT_ETHER: /* These can do spanning tree. */ 2213 break; 2214 default: 2215 /* Nothing else can. */ 2216 return (EINVAL); 2217 } 2218 2219 BSTP_LOCK(bs); 2220 LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next); 2221 bp->bp_active = 1; 2222 bp->bp_flags |= BSTP_PORT_NEWINFO; 2223 bstp_reinit(bs); 2224 bstp_update_roles(bs, bp); 2225 BSTP_UNLOCK(bs); 2226 return (0); 2227 } 2228 2229 void 2230 bstp_disable(struct bstp_port *bp) 2231 { 2232 struct bstp_state *bs = bp->bp_bs; 2233 2234 KASSERT(bp->bp_active == 1, ("not a bstp member")); 2235 2236 BSTP_LOCK(bs); 2237 bstp_disable_port(bs, bp); 2238 LIST_REMOVE(bp, bp_next); 2239 bp->bp_active = 0; 2240 bstp_reinit(bs); 2241 BSTP_UNLOCK(bs); 2242 } 2243 2244 /* 2245 * The bstp_port structure is about to be freed by the parent bridge. 2246 */ 2247 void 2248 bstp_destroy(struct bstp_port *bp) 2249 { 2250 KASSERT(bp->bp_active == 0, ("port is still attached")); 2251 taskqueue_drain(taskqueue_swi, &bp->bp_statetask); 2252 taskqueue_drain(taskqueue_swi, &bp->bp_rtagetask); 2253 } 2254