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sys/net/bridgestp.c
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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 59 #include <netinet/in.h> 60 #include <netinet/in_systm.h> 61 #include <netinet/in_var.h> 62 #include <netinet/if_ether.h> 63 #include <net/bridgestp.h> 64 65 #ifdef BRIDGESTP_DEBUG 66 #define DPRINTF(fmt, arg...) printf("bstp: " fmt, ##arg) 67 #else 68 #define DPRINTF(fmt, arg...) 69 #endif 70 71 #define PV2ADDR(pv, eaddr) do { \ 72 eaddr[0] = pv >> 40; \ 73 eaddr[1] = pv >> 32; \ 74 eaddr[2] = pv >> 24; \ 75 eaddr[3] = pv >> 16; \ 76 eaddr[4] = pv >> 8; \ 77 eaddr[5] = pv >> 0; \ 78 } while (0) 79 80 #define INFO_BETTER 1 81 #define INFO_SAME 0 82 #define INFO_WORSE -1 83 84 const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; 85 86 LIST_HEAD(, bstp_state) bstp_list; 87 static struct mtx bstp_list_mtx; 88 89 static void bstp_transmit(struct bstp_state *, struct bstp_port *); 90 static void bstp_transmit_bpdu(struct bstp_state *, struct bstp_port *); 91 static void bstp_transmit_tcn(struct bstp_state *, struct bstp_port *); 92 static void bstp_decode_bpdu(struct bstp_port *, struct bstp_cbpdu *, 93 struct bstp_config_unit *); 94 static void bstp_send_bpdu(struct bstp_state *, struct bstp_port *, 95 struct bstp_cbpdu *); 96 static void bstp_enqueue(struct ifnet *, struct mbuf *); 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 bstp_enqueue(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 bstp_enqueue(ifp, m); 390 } 391 392 static void 393 bstp_enqueue(struct ifnet *dst_ifp, struct mbuf *m) 394 { 395 int err = 0; 396 397 IFQ_ENQUEUE(&dst_ifp->if_snd, m, err); 398 399 if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0) 400 (*dst_ifp->if_start)(dst_ifp); 401 } 402 403 static int 404 bstp_pdu_flags(struct bstp_port *bp) 405 { 406 int flags = 0; 407 408 if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING) 409 flags |= BSTP_PDU_F_P; 410 411 if (bp->bp_agree) 412 flags |= BSTP_PDU_F_A; 413 414 if (bp->bp_tc_timer.active) 415 flags |= BSTP_PDU_F_TC; 416 417 if (bp->bp_tc_ack) 418 flags |= BSTP_PDU_F_TCA; 419 420 switch (bp->bp_state) { 421 case BSTP_IFSTATE_LEARNING: 422 flags |= BSTP_PDU_F_L; 423 break; 424 425 case BSTP_IFSTATE_FORWARDING: 426 flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F); 427 break; 428 } 429 430 switch (bp->bp_role) { 431 case BSTP_ROLE_ROOT: 432 flags |= 433 (BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT); 434 break; 435 436 case BSTP_ROLE_ALTERNATE: 437 case BSTP_ROLE_BACKUP: /* fall through */ 438 flags |= 439 (BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT); 440 break; 441 442 case BSTP_ROLE_DESIGNATED: 443 flags |= 444 (BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT); 445 break; 446 } 447 448 /* Strip off unused flags in either mode */ 449 switch (bp->bp_protover) { 450 case BSTP_PROTO_STP: 451 flags &= BSTP_PDU_STPMASK; 452 break; 453 case BSTP_PROTO_RSTP: 454 flags &= BSTP_PDU_RSTPMASK; 455 break; 456 } 457 return (flags); 458 } 459 460 struct mbuf * 461 bstp_input(struct bstp_port *bp, struct ifnet *ifp, struct mbuf *m) 462 { 463 struct bstp_state *bs = bp->bp_bs; 464 struct ether_header *eh; 465 struct bstp_tbpdu tpdu; 466 uint16_t len; 467 468 if (bp->bp_active == 0) { 469 m_freem(m); 470 return (NULL); 471 } 472 473 BSTP_LOCK(bs); 474 475 eh = mtod(m, struct ether_header *); 476 477 len = ntohs(eh->ether_type); 478 if (len < sizeof(tpdu)) 479 goto out; 480 481 m_adj(m, ETHER_HDR_LEN); 482 483 if (m->m_pkthdr.len > len) 484 m_adj(m, len - m->m_pkthdr.len); 485 if (m->m_len < sizeof(tpdu) && 486 (m = m_pullup(m, sizeof(tpdu))) == NULL) 487 goto out; 488 489 memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu)); 490 491 /* basic packet checks */ 492 if (tpdu.tbu_dsap != LLC_8021D_LSAP || 493 tpdu.tbu_ssap != LLC_8021D_LSAP || 494 tpdu.tbu_ctl != LLC_UI) 495 goto out; 496 if (tpdu.tbu_protoid != BSTP_PROTO_ID) 497 goto out; 498 499 /* 500 * We can treat later versions of the PDU as the same as the maximum 501 * version we implement. All additional parameters/flags are ignored. 502 */ 503 if (tpdu.tbu_protover > BSTP_PROTO_MAX) 504 tpdu.tbu_protover = BSTP_PROTO_MAX; 505 506 if (tpdu.tbu_protover != bp->bp_protover) { 507 /* 508 * Wait for the migration delay timer to expire before changing 509 * protocol version to avoid flip-flops. 510 */ 511 if (bp->bp_flags & BSTP_PORT_CANMIGRATE) 512 bstp_set_port_proto(bp, tpdu.tbu_protover); 513 else 514 goto out; 515 } 516 517 /* Clear operedge upon receiving a PDU on the port */ 518 bp->bp_operedge = 0; 519 bstp_timer_start(&bp->bp_edge_delay_timer, 520 BSTP_DEFAULT_MIGRATE_DELAY); 521 522 switch (tpdu.tbu_protover) { 523 case BSTP_PROTO_STP: 524 bstp_received_stp(bs, bp, &m, &tpdu); 525 break; 526 527 case BSTP_PROTO_RSTP: 528 bstp_received_rstp(bs, bp, &m, &tpdu); 529 break; 530 } 531 out: 532 BSTP_UNLOCK(bs); 533 if (m) 534 m_freem(m); 535 return (NULL); 536 } 537 538 static void 539 bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp, 540 struct mbuf **mp, struct bstp_tbpdu *tpdu) 541 { 542 struct bstp_cbpdu cpdu; 543 struct bstp_config_unit *cu = &bp->bp_msg_cu; 544 struct bstp_tcn_unit tu; 545 546 switch (tpdu->tbu_bpdutype) { 547 case BSTP_MSGTYPE_TCN: 548 tu.tu_message_type = tpdu->tbu_bpdutype; 549 bstp_received_tcn(bs, bp, &tu); 550 break; 551 case BSTP_MSGTYPE_CFG: 552 if ((*mp)->m_len < BSTP_BPDU_STP_LEN && 553 (*mp = m_pullup(*mp, BSTP_BPDU_STP_LEN)) == NULL) 554 return; 555 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_STP_LEN); 556 557 bstp_decode_bpdu(bp, &cpdu, cu); 558 bstp_received_bpdu(bs, bp, cu); 559 break; 560 } 561 } 562 563 static void 564 bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp, 565 struct mbuf **mp, struct bstp_tbpdu *tpdu) 566 { 567 struct bstp_cbpdu cpdu; 568 struct bstp_config_unit *cu = &bp->bp_msg_cu; 569 570 if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP) 571 return; 572 573 if ((*mp)->m_len < BSTP_BPDU_RSTP_LEN && 574 (*mp = m_pullup(*mp, BSTP_BPDU_RSTP_LEN)) == NULL) 575 return; 576 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_RSTP_LEN); 577 578 bstp_decode_bpdu(bp, &cpdu, cu); 579 bstp_received_bpdu(bs, bp, cu); 580 } 581 582 static void 583 bstp_received_tcn(struct bstp_state *bs, struct bstp_port *bp, 584 struct bstp_tcn_unit *tcn) 585 { 586 bp->bp_rcvdtcn = 1; 587 bstp_update_tc(bp); 588 } 589 590 static void 591 bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp, 592 struct bstp_config_unit *cu) 593 { 594 int type; 595 596 BSTP_LOCK_ASSERT(bs); 597 598 /* We need to have transitioned to INFO_MINE before proceeding */ 599 switch (bp->bp_infois) { 600 case BSTP_INFO_DISABLED: 601 case BSTP_INFO_AGED: 602 return; 603 } 604 605 type = bstp_pdu_rcvtype(bp, cu); 606 607 switch (type) { 608 case BSTP_PDU_SUPERIOR: 609 bs->bs_allsynced = 0; 610 bp->bp_agreed = 0; 611 bp->bp_proposing = 0; 612 613 if (cu->cu_proposal && cu->cu_forwarding == 0) 614 bp->bp_proposed = 1; 615 if (cu->cu_topology_change) 616 bp->bp_rcvdtc = 1; 617 if (cu->cu_topology_change_ack) 618 bp->bp_rcvdtca = 1; 619 620 if (bp->bp_agree && 621 !bstp_pdu_bettersame(bp, BSTP_INFO_RECIEVED)) 622 bp->bp_agree = 0; 623 624 /* copy the received priority and timers to the port */ 625 bp->bp_port_pv = cu->cu_pv; 626 bp->bp_port_msg_age = cu->cu_message_age; 627 bp->bp_port_max_age = cu->cu_max_age; 628 bp->bp_port_fdelay = cu->cu_forward_delay; 629 bp->bp_port_htime = 630 (cu->cu_hello_time > BSTP_MIN_HELLO_TIME ? 631 cu->cu_hello_time : BSTP_MIN_HELLO_TIME); 632 633 /* set expiry for the new info */ 634 bstp_set_timer_msgage(bp); 635 636 bp->bp_infois = BSTP_INFO_RECIEVED; 637 bstp_assign_roles(bs); 638 break; 639 640 case BSTP_PDU_REPEATED: 641 if (cu->cu_proposal && cu->cu_forwarding == 0) 642 bp->bp_proposed = 1; 643 if (cu->cu_topology_change) 644 bp->bp_rcvdtc = 1; 645 if (cu->cu_topology_change_ack) 646 bp->bp_rcvdtca = 1; 647 648 /* rearm the age timer */ 649 bstp_set_timer_msgage(bp); 650 break; 651 652 case BSTP_PDU_INFERIOR: 653 if (cu->cu_learning) { 654 bp->bp_agreed = 1; 655 bp->bp_proposing = 0; 656 } 657 break; 658 659 case BSTP_PDU_INFERIORALT: 660 /* 661 * only point to point links are allowed fast 662 * transitions to forwarding. 663 */ 664 if (cu->cu_agree && bp->bp_ptp_link) { 665 bp->bp_agreed = 1; 666 bp->bp_proposing = 0; 667 } else 668 bp->bp_agreed = 0; 669 670 if (cu->cu_topology_change) 671 bp->bp_rcvdtc = 1; 672 if (cu->cu_topology_change_ack) 673 bp->bp_rcvdtca = 1; 674 break; 675 676 case BSTP_PDU_OTHER: 677 return; /* do nothing */ 678 } 679 /* update the state machines with the new data */ 680 bstp_update_state(bs, bp); 681 } 682 683 static int 684 bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu) 685 { 686 int type; 687 688 /* default return type */ 689 type = BSTP_PDU_OTHER; 690 691 switch (cu->cu_role) { 692 case BSTP_ROLE_DESIGNATED: 693 if (bstp_info_superior(&bp->bp_port_pv, &cu->cu_pv)) 694 /* bpdu priority is superior */ 695 type = BSTP_PDU_SUPERIOR; 696 else if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) == 697 INFO_SAME) { 698 if (bp->bp_port_msg_age != cu->cu_message_age || 699 bp->bp_port_max_age != cu->cu_max_age || 700 bp->bp_port_fdelay != cu->cu_forward_delay || 701 bp->bp_port_htime != cu->cu_hello_time) 702 /* bpdu priority is equal and timers differ */ 703 type = BSTP_PDU_SUPERIOR; 704 else 705 /* bpdu is equal */ 706 type = BSTP_PDU_REPEATED; 707 } else 708 /* bpdu priority is worse */ 709 type = BSTP_PDU_INFERIOR; 710 711 break; 712 713 case BSTP_ROLE_ROOT: 714 case BSTP_ROLE_ALTERNATE: 715 case BSTP_ROLE_BACKUP: 716 if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) <= INFO_SAME) 717 /* 718 * not a designated port and priority is the same or 719 * worse 720 */ 721 type = BSTP_PDU_INFERIORALT; 722 break; 723 } 724 725 return (type); 726 } 727 728 static int 729 bstp_pdu_bettersame(struct bstp_port *bp, int newinfo) 730 { 731 if (newinfo == BSTP_INFO_RECIEVED && 732 bp->bp_infois == BSTP_INFO_RECIEVED && 733 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME) 734 return (1); 735 736 if (newinfo == BSTP_INFO_MINE && 737 bp->bp_infois == BSTP_INFO_MINE && 738 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) >= INFO_SAME) 739 return (1); 740 741 return (0); 742 } 743 744 static int 745 bstp_info_cmp(struct bstp_pri_vector *pv, 746 struct bstp_pri_vector *cpv) 747 { 748 if (cpv->pv_root_id < pv->pv_root_id) 749 return (INFO_BETTER); 750 if (cpv->pv_root_id > pv->pv_root_id) 751 return (INFO_WORSE); 752 753 if (cpv->pv_cost < pv->pv_cost) 754 return (INFO_BETTER); 755 if (cpv->pv_cost > pv->pv_cost) 756 return (INFO_WORSE); 757 758 if (cpv->pv_dbridge_id < pv->pv_dbridge_id) 759 return (INFO_BETTER); 760 if (cpv->pv_dbridge_id > pv->pv_dbridge_id) 761 return (INFO_WORSE); 762 763 if (cpv->pv_dport_id < pv->pv_dport_id) 764 return (INFO_BETTER); 765 if (cpv->pv_dport_id > pv->pv_dport_id) 766 return (INFO_WORSE); 767 768 return (INFO_SAME); 769 } 770 771 /* 772 * This message priority vector is superior to the port priority vector and 773 * will replace it if, and only if, the message priority vector is better than 774 * the port priority vector, or the message has been transmitted from the same 775 * designated bridge and designated port as the port priority vector. 776 */ 777 static int 778 bstp_info_superior(struct bstp_pri_vector *pv, 779 struct bstp_pri_vector *cpv) 780 { 781 if (bstp_info_cmp(pv, cpv) == INFO_BETTER || 782 (bstp_same_bridgeid(pv->pv_dbridge_id, cpv->pv_dbridge_id) && 783 (cpv->pv_dport_id & 0xfff) == (pv->pv_dport_id & 0xfff))) 784 return (1); 785 return (0); 786 } 787 788 static void 789 bstp_assign_roles(struct bstp_state *bs) 790 { 791 struct bstp_port *bp, *rbp = NULL; 792 struct bstp_pri_vector pv; 793 794 /* default to our priority vector */ 795 bs->bs_root_pv = bs->bs_bridge_pv; 796 bs->bs_root_msg_age = 0; 797 bs->bs_root_max_age = bs->bs_bridge_max_age; 798 bs->bs_root_fdelay = bs->bs_bridge_fdelay; 799 bs->bs_root_htime = bs->bs_bridge_htime; 800 bs->bs_root_port = NULL; 801 802 /* check if any recieved info supersedes us */ 803 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 804 if (bp->bp_infois != BSTP_INFO_RECIEVED) 805 continue; 806 807 pv = bp->bp_port_pv; 808 pv.pv_cost += bp->bp_path_cost; 809 810 /* 811 * The root priority vector is the best of the set comprising 812 * the bridge priority vector plus all root path priority 813 * vectors whose bridge address is not equal to us. 814 */ 815 if (bstp_same_bridgeid(pv.pv_dbridge_id, 816 bs->bs_bridge_pv.pv_dbridge_id) == 0 && 817 bstp_info_cmp(&bs->bs_root_pv, &pv) == INFO_BETTER) { 818 /* the port vector replaces the root */ 819 bs->bs_root_pv = pv; 820 bs->bs_root_msg_age = bp->bp_port_msg_age + 821 BSTP_MESSAGE_AGE_INCR; 822 bs->bs_root_max_age = bp->bp_port_max_age; 823 bs->bs_root_fdelay = bp->bp_port_fdelay; 824 bs->bs_root_htime = bp->bp_port_htime; 825 rbp = bp; 826 } 827 } 828 829 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 830 /* calculate the port designated vector */ 831 bp->bp_desg_pv.pv_root_id = bs->bs_root_pv.pv_root_id; 832 bp->bp_desg_pv.pv_cost = bs->bs_root_pv.pv_cost; 833 bp->bp_desg_pv.pv_dbridge_id = bs->bs_bridge_pv.pv_dbridge_id; 834 bp->bp_desg_pv.pv_dport_id = bp->bp_port_id; 835 bp->bp_desg_pv.pv_port_id = bp->bp_port_id; 836 837 /* calculate designated times */ 838 bp->bp_desg_msg_age = bs->bs_root_msg_age; 839 bp->bp_desg_max_age = bs->bs_root_max_age; 840 bp->bp_desg_fdelay = bs->bs_root_fdelay; 841 bp->bp_desg_htime = bs->bs_bridge_htime; 842 843 844 switch (bp->bp_infois) { 845 case BSTP_INFO_DISABLED: 846 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 847 break; 848 849 case BSTP_INFO_AGED: 850 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 851 bstp_update_info(bp); 852 break; 853 854 case BSTP_INFO_MINE: 855 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 856 /* update the port info if stale */ 857 if (bstp_info_cmp(&bp->bp_port_pv, 858 &bp->bp_desg_pv) != INFO_SAME || 859 (rbp != NULL && 860 (bp->bp_port_msg_age != rbp->bp_port_msg_age || 861 bp->bp_port_max_age != rbp->bp_port_max_age || 862 bp->bp_port_fdelay != rbp->bp_port_fdelay || 863 bp->bp_port_htime != rbp->bp_port_htime))) 864 bstp_update_info(bp); 865 break; 866 867 case BSTP_INFO_RECIEVED: 868 if (bp == rbp) { 869 /* 870 * root priority is derived from this 871 * port, make it the root port. 872 */ 873 bstp_set_port_role(bp, BSTP_ROLE_ROOT); 874 bs->bs_root_port = bp; 875 } else if (bstp_info_cmp(&bp->bp_port_pv, 876 &bp->bp_desg_pv) == INFO_BETTER) { 877 /* 878 * the port priority is lower than the root 879 * port. 880 */ 881 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 882 bstp_update_info(bp); 883 } else { 884 if (bstp_same_bridgeid( 885 bp->bp_port_pv.pv_dbridge_id, 886 bs->bs_bridge_pv.pv_dbridge_id)) { 887 /* 888 * the designated bridge refers to 889 * another port on this bridge. 890 */ 891 bstp_set_port_role(bp, 892 BSTP_ROLE_BACKUP); 893 } else { 894 /* 895 * the port is an inferior path to the 896 * root bridge. 897 */ 898 bstp_set_port_role(bp, 899 BSTP_ROLE_ALTERNATE); 900 } 901 } 902 break; 903 } 904 } 905 } 906 907 static void 908 bstp_update_state(struct bstp_state *bs, struct bstp_port *bp) 909 { 910 struct bstp_port *bp2; 911 int synced; 912 913 BSTP_LOCK_ASSERT(bs); 914 915 /* check if all the ports have syncronised again */ 916 if (!bs->bs_allsynced) { 917 synced = 1; 918 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 919 if (!(bp2->bp_synced || 920 bp2->bp_role == BSTP_ROLE_ROOT)) { 921 synced = 0; 922 break; 923 } 924 } 925 bs->bs_allsynced = synced; 926 } 927 928 bstp_update_roles(bs, bp); 929 bstp_update_tc(bp); 930 } 931 932 static void 933 bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp) 934 { 935 switch (bp->bp_role) { 936 case BSTP_ROLE_DISABLED: 937 /* Clear any flags if set */ 938 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 939 bp->bp_sync = 0; 940 bp->bp_synced = 1; 941 bp->bp_reroot = 0; 942 } 943 break; 944 945 case BSTP_ROLE_ALTERNATE: 946 case BSTP_ROLE_BACKUP: 947 if ((bs->bs_allsynced && !bp->bp_agree) || 948 (bp->bp_proposed && bp->bp_agree)) { 949 bp->bp_proposed = 0; 950 bp->bp_agree = 1; 951 bp->bp_flags |= BSTP_PORT_NEWINFO; 952 DPRINTF("%s -> ALTERNATE_AGREED\n", 953 bp->bp_ifp->if_xname); 954 } 955 956 if (bp->bp_proposed && !bp->bp_agree) { 957 bstp_set_all_sync(bs); 958 bp->bp_proposed = 0; 959 DPRINTF("%s -> ALTERNATE_PROPOSED\n", 960 bp->bp_ifp->if_xname); 961 } 962 963 /* Clear any flags if set */ 964 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 965 bp->bp_sync = 0; 966 bp->bp_synced = 1; 967 bp->bp_reroot = 0; 968 DPRINTF("%s -> ALTERNATE_PORT\n", bp->bp_ifp->if_xname); 969 } 970 break; 971 972 case BSTP_ROLE_ROOT: 973 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) { 974 bstp_set_all_reroot(bs); 975 DPRINTF("%s -> ROOT_REROOT\n", bp->bp_ifp->if_xname); 976 } 977 978 if ((bs->bs_allsynced && !bp->bp_agree) || 979 (bp->bp_proposed && bp->bp_agree)) { 980 bp->bp_proposed = 0; 981 bp->bp_sync = 0; 982 bp->bp_agree = 1; 983 bp->bp_flags |= BSTP_PORT_NEWINFO; 984 DPRINTF("%s -> ROOT_AGREED\n", bp->bp_ifp->if_xname); 985 } 986 987 if (bp->bp_proposed && !bp->bp_agree) { 988 bstp_set_all_sync(bs); 989 bp->bp_proposed = 0; 990 DPRINTF("%s -> ROOT_PROPOSED\n", bp->bp_ifp->if_xname); 991 } 992 993 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 994 (bp->bp_forward_delay_timer.active == 0 || 995 (bstp_rerooted(bs, bp) && 996 bp->bp_recent_backup_timer.active == 0 && 997 bp->bp_protover == BSTP_PROTO_RSTP))) { 998 switch (bp->bp_state) { 999 case BSTP_IFSTATE_DISCARDING: 1000 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 1001 break; 1002 case BSTP_IFSTATE_LEARNING: 1003 bstp_set_port_state(bp, 1004 BSTP_IFSTATE_FORWARDING); 1005 break; 1006 } 1007 } 1008 1009 if (bp->bp_state == BSTP_IFSTATE_FORWARDING && bp->bp_reroot) { 1010 bp->bp_reroot = 0; 1011 DPRINTF("%s -> ROOT_REROOTED\n", bp->bp_ifp->if_xname); 1012 } 1013 break; 1014 1015 case BSTP_ROLE_DESIGNATED: 1016 if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) { 1017 bp->bp_reroot = 0; 1018 DPRINTF("%s -> DESIGNATED_RETIRED\n", 1019 bp->bp_ifp->if_xname); 1020 } 1021 1022 if ((bp->bp_state == BSTP_IFSTATE_DISCARDING && 1023 !bp->bp_synced) || (bp->bp_agreed && !bp->bp_synced) || 1024 (bp->bp_operedge && !bp->bp_synced) || 1025 (bp->bp_sync && bp->bp_synced)) { 1026 bstp_timer_stop(&bp->bp_recent_root_timer); 1027 bp->bp_synced = 1; 1028 bp->bp_sync = 0; 1029 DPRINTF("%s -> DESIGNATED_SYNCED\n", 1030 bp->bp_ifp->if_xname); 1031 } 1032 1033 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1034 !bp->bp_agreed && !bp->bp_proposing && 1035 !bp->bp_operedge) { 1036 bp->bp_proposing = 1; 1037 bp->bp_flags |= BSTP_PORT_NEWINFO; 1038 bstp_timer_start(&bp->bp_edge_delay_timer, 1039 (bp->bp_ptp_link ? BSTP_DEFAULT_MIGRATE_DELAY : 1040 bp->bp_desg_max_age)); 1041 DPRINTF("%s -> DESIGNATED_PROPOSE\n", 1042 bp->bp_ifp->if_xname); 1043 } 1044 1045 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1046 (bp->bp_forward_delay_timer.active == 0 || bp->bp_agreed || 1047 bp->bp_operedge) && 1048 (bp->bp_recent_root_timer.active == 0 || !bp->bp_reroot) && 1049 !bp->bp_sync) { 1050 if (bp->bp_agreed) 1051 DPRINTF("%s -> AGREED\n", bp->bp_ifp->if_xname); 1052 /* 1053 * If agreed|operedge then go straight to forwarding, 1054 * otherwise follow discard -> learn -> forward. 1055 */ 1056 if (bp->bp_agreed || bp->bp_operedge || 1057 bp->bp_state == BSTP_IFSTATE_LEARNING) { 1058 bstp_set_port_state(bp, 1059 BSTP_IFSTATE_FORWARDING); 1060 bp->bp_agreed = bp->bp_protover; 1061 } else if (bp->bp_state == BSTP_IFSTATE_DISCARDING) 1062 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 1063 } 1064 1065 if (((bp->bp_sync && !bp->bp_synced) || 1066 (bp->bp_reroot && bp->bp_recent_root_timer.active) || 1067 (bp->bp_flags & BSTP_PORT_DISPUTED)) && !bp->bp_operedge && 1068 bp->bp_state != BSTP_IFSTATE_DISCARDING) { 1069 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1070 bp->bp_flags &= ~BSTP_PORT_DISPUTED; 1071 bstp_timer_start(&bp->bp_forward_delay_timer, 1072 bp->bp_protover == BSTP_PROTO_RSTP ? 1073 bp->bp_desg_htime : bp->bp_desg_fdelay); 1074 DPRINTF("%s -> DESIGNATED_DISCARD\n", 1075 bp->bp_ifp->if_xname); 1076 } 1077 break; 1078 } 1079 1080 if (bp->bp_flags & BSTP_PORT_NEWINFO) 1081 bstp_transmit(bs, bp); 1082 } 1083 1084 static void 1085 bstp_update_tc(struct bstp_port *bp) 1086 { 1087 switch (bp->bp_tcstate) { 1088 case BSTP_TCSTATE_ACTIVE: 1089 if ((bp->bp_role != BSTP_ROLE_DESIGNATED && 1090 bp->bp_role != BSTP_ROLE_ROOT) || bp->bp_operedge) 1091 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1092 1093 if (bp->bp_rcvdtcn) 1094 bstp_set_port_tc(bp, BSTP_TCSTATE_TCN); 1095 if (bp->bp_rcvdtc) 1096 bstp_set_port_tc(bp, BSTP_TCSTATE_TC); 1097 1098 if (bp->bp_tc_prop && !bp->bp_operedge) 1099 bstp_set_port_tc(bp, BSTP_TCSTATE_PROPAG); 1100 1101 if (bp->bp_rcvdtca) 1102 bstp_set_port_tc(bp, BSTP_TCSTATE_ACK); 1103 break; 1104 1105 case BSTP_TCSTATE_INACTIVE: 1106 if ((bp->bp_state == BSTP_IFSTATE_LEARNING || 1107 bp->bp_state == BSTP_IFSTATE_FORWARDING) && 1108 bp->bp_fdbflush == 0) 1109 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1110 break; 1111 1112 case BSTP_TCSTATE_LEARNING: 1113 if (bp->bp_rcvdtc || bp->bp_rcvdtcn || bp->bp_rcvdtca || 1114 bp->bp_tc_prop) 1115 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1116 else if (bp->bp_role != BSTP_ROLE_DESIGNATED && 1117 bp->bp_role != BSTP_ROLE_ROOT && 1118 bp->bp_state == BSTP_IFSTATE_DISCARDING) 1119 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1120 1121 if ((bp->bp_role == BSTP_ROLE_DESIGNATED || 1122 bp->bp_role == BSTP_ROLE_ROOT) && 1123 bp->bp_state == BSTP_IFSTATE_FORWARDING && 1124 !bp->bp_operedge) 1125 bstp_set_port_tc(bp, BSTP_TCSTATE_DETECTED); 1126 break; 1127 1128 /* these are transient states and go straight back to ACTIVE */ 1129 case BSTP_TCSTATE_DETECTED: 1130 case BSTP_TCSTATE_TCN: 1131 case BSTP_TCSTATE_TC: 1132 case BSTP_TCSTATE_PROPAG: 1133 case BSTP_TCSTATE_ACK: 1134 DPRINTF("Invalid TC state for %s\n", 1135 bp->bp_ifp->if_xname); 1136 break; 1137 } 1138 1139 } 1140 1141 static void 1142 bstp_update_info(struct bstp_port *bp) 1143 { 1144 struct bstp_state *bs = bp->bp_bs; 1145 1146 bp->bp_proposing = 0; 1147 bp->bp_proposed = 0; 1148 1149 if (bp->bp_agreed && !bstp_pdu_bettersame(bp, BSTP_INFO_MINE)) 1150 bp->bp_agreed = 0; 1151 1152 if (bp->bp_synced && !bp->bp_agreed) { 1153 bp->bp_synced = 0; 1154 bs->bs_allsynced = 0; 1155 } 1156 1157 /* copy the designated pv to the port */ 1158 bp->bp_port_pv = bp->bp_desg_pv; 1159 bp->bp_port_msg_age = bp->bp_desg_msg_age; 1160 bp->bp_port_max_age = bp->bp_desg_max_age; 1161 bp->bp_port_fdelay = bp->bp_desg_fdelay; 1162 bp->bp_port_htime = bp->bp_desg_htime; 1163 bp->bp_infois = BSTP_INFO_MINE; 1164 1165 /* Set transmit flag but do not immediately send */ 1166 bp->bp_flags |= BSTP_PORT_NEWINFO; 1167 } 1168 1169 /* set tcprop on every port other than the caller */ 1170 static void 1171 bstp_set_other_tcprop(struct bstp_port *bp) 1172 { 1173 struct bstp_state *bs = bp->bp_bs; 1174 struct bstp_port *bp2; 1175 1176 BSTP_LOCK_ASSERT(bs); 1177 1178 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1179 if (bp2 == bp) 1180 continue; 1181 bp2->bp_tc_prop = 1; 1182 } 1183 } 1184 1185 static void 1186 bstp_set_all_reroot(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_reroot = 1; 1194 } 1195 1196 static void 1197 bstp_set_all_sync(struct bstp_state *bs) 1198 { 1199 struct bstp_port *bp; 1200 1201 BSTP_LOCK_ASSERT(bs); 1202 1203 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1204 bp->bp_sync = 1; 1205 bp->bp_synced = 0; /* Not explicit in spec */ 1206 } 1207 1208 bs->bs_allsynced = 0; 1209 } 1210 1211 static void 1212 bstp_set_port_state(struct bstp_port *bp, int state) 1213 { 1214 if (bp->bp_state == state) 1215 return; 1216 1217 bp->bp_state = state; 1218 1219 switch (bp->bp_state) { 1220 case BSTP_IFSTATE_DISCARDING: 1221 DPRINTF("state changed to DISCARDING on %s\n", 1222 bp->bp_ifp->if_xname); 1223 break; 1224 1225 case BSTP_IFSTATE_LEARNING: 1226 DPRINTF("state changed to LEARNING on %s\n", 1227 bp->bp_ifp->if_xname); 1228 1229 bstp_timer_start(&bp->bp_forward_delay_timer, 1230 bp->bp_protover == BSTP_PROTO_RSTP ? 1231 bp->bp_desg_htime : bp->bp_desg_fdelay); 1232 break; 1233 1234 case BSTP_IFSTATE_FORWARDING: 1235 DPRINTF("state changed to FORWARDING on %s\n", 1236 bp->bp_ifp->if_xname); 1237 1238 bstp_timer_stop(&bp->bp_forward_delay_timer); 1239 /* Record that we enabled forwarding */ 1240 bp->bp_forward_transitions++; 1241 break; 1242 } 1243 1244 /* notify the parent bridge */ 1245 taskqueue_enqueue(taskqueue_swi, &bp->bp_statetask); 1246 } 1247 1248 static void 1249 bstp_set_port_role(struct bstp_port *bp, int role) 1250 { 1251 struct bstp_state *bs = bp->bp_bs; 1252 1253 if (bp->bp_role == role) 1254 return; 1255 1256 /* perform pre-change tasks */ 1257 switch (bp->bp_role) { 1258 case BSTP_ROLE_DISABLED: 1259 bstp_timer_start(&bp->bp_forward_delay_timer, 1260 bp->bp_desg_max_age); 1261 break; 1262 1263 case BSTP_ROLE_BACKUP: 1264 bstp_timer_start(&bp->bp_recent_backup_timer, 1265 bp->bp_desg_htime * 2); 1266 /* fall through */ 1267 case BSTP_ROLE_ALTERNATE: 1268 bstp_timer_start(&bp->bp_forward_delay_timer, 1269 bp->bp_desg_fdelay); 1270 bp->bp_sync = 0; 1271 bp->bp_synced = 1; 1272 bp->bp_reroot = 0; 1273 break; 1274 1275 case BSTP_ROLE_ROOT: 1276 bstp_timer_start(&bp->bp_recent_root_timer, 1277 BSTP_DEFAULT_FORWARD_DELAY); 1278 break; 1279 } 1280 1281 bp->bp_role = role; 1282 /* clear values not carried between roles */ 1283 bp->bp_proposing = 0; 1284 bs->bs_allsynced = 0; 1285 1286 /* initialise the new role */ 1287 switch (bp->bp_role) { 1288 case BSTP_ROLE_DISABLED: 1289 case BSTP_ROLE_ALTERNATE: 1290 case BSTP_ROLE_BACKUP: 1291 DPRINTF("%s role -> ALT/BACK/DISABLED\n", 1292 bp->bp_ifp->if_xname); 1293 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1294 bstp_timer_stop(&bp->bp_recent_root_timer); 1295 bstp_timer_latch(&bp->bp_forward_delay_timer); 1296 bp->bp_sync = 0; 1297 bp->bp_synced = 1; 1298 bp->bp_reroot = 0; 1299 break; 1300 1301 case BSTP_ROLE_ROOT: 1302 DPRINTF("%s role -> ROOT\n", 1303 bp->bp_ifp->if_xname); 1304 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1305 bstp_timer_latch(&bp->bp_recent_root_timer); 1306 bp->bp_proposing = 0; 1307 break; 1308 1309 case BSTP_ROLE_DESIGNATED: 1310 DPRINTF("%s role -> DESIGNATED\n", 1311 bp->bp_ifp->if_xname); 1312 bstp_timer_start(&bp->bp_hello_timer, 1313 bp->bp_desg_htime); 1314 bp->bp_agree = 0; 1315 break; 1316 } 1317 1318 /* let the TC state know that the role changed */ 1319 bstp_update_tc(bp); 1320 } 1321 1322 static void 1323 bstp_set_port_proto(struct bstp_port *bp, int proto) 1324 { 1325 struct bstp_state *bs = bp->bp_bs; 1326 1327 /* supported protocol versions */ 1328 switch (proto) { 1329 case BSTP_PROTO_STP: 1330 /* we can downgrade protocols only */ 1331 bstp_timer_stop(&bp->bp_migrate_delay_timer); 1332 /* clear unsupported features */ 1333 bp->bp_operedge = 0; 1334 /* STP compat mode only uses 16 bits of the 32 */ 1335 if (bp->bp_path_cost > 65535) 1336 bp->bp_path_cost = 65535; 1337 break; 1338 1339 case BSTP_PROTO_RSTP: 1340 bstp_timer_start(&bp->bp_migrate_delay_timer, 1341 bs->bs_migration_delay); 1342 break; 1343 1344 default: 1345 DPRINTF("Unsupported STP version %d\n", proto); 1346 return; 1347 } 1348 1349 bp->bp_protover = proto; 1350 bp->bp_flags &= ~BSTP_PORT_CANMIGRATE; 1351 } 1352 1353 static void 1354 bstp_set_port_tc(struct bstp_port *bp, int state) 1355 { 1356 struct bstp_state *bs = bp->bp_bs; 1357 1358 bp->bp_tcstate = state; 1359 1360 /* initialise the new state */ 1361 switch (bp->bp_tcstate) { 1362 case BSTP_TCSTATE_ACTIVE: 1363 DPRINTF("%s -> TC_ACTIVE\n", bp->bp_ifp->if_xname); 1364 /* nothing to do */ 1365 break; 1366 1367 case BSTP_TCSTATE_INACTIVE: 1368 bstp_timer_stop(&bp->bp_tc_timer); 1369 /* flush routes on the parent bridge */ 1370 bp->bp_fdbflush = 1; 1371 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask); 1372 bp->bp_tc_ack = 0; 1373 DPRINTF("%s -> TC_INACTIVE\n", bp->bp_ifp->if_xname); 1374 break; 1375 1376 case BSTP_TCSTATE_LEARNING: 1377 bp->bp_rcvdtc = 0; 1378 bp->bp_rcvdtcn = 0; 1379 bp->bp_rcvdtca = 0; 1380 bp->bp_tc_prop = 0; 1381 DPRINTF("%s -> TC_LEARNING\n", bp->bp_ifp->if_xname); 1382 break; 1383 1384 case BSTP_TCSTATE_DETECTED: 1385 bstp_set_timer_tc(bp); 1386 bstp_set_other_tcprop(bp); 1387 /* send out notification */ 1388 bp->bp_flags |= BSTP_PORT_NEWINFO; 1389 bstp_transmit(bs, bp); 1390 getmicrotime(&bs->bs_last_tc_time); 1391 DPRINTF("%s -> TC_DETECTED\n", bp->bp_ifp->if_xname); 1392 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1393 break; 1394 1395 case BSTP_TCSTATE_TCN: 1396 bstp_set_timer_tc(bp); 1397 DPRINTF("%s -> TC_TCN\n", bp->bp_ifp->if_xname); 1398 /* fall through */ 1399 case BSTP_TCSTATE_TC: 1400 bp->bp_rcvdtc = 0; 1401 bp->bp_rcvdtcn = 0; 1402 if (bp->bp_role == BSTP_ROLE_DESIGNATED) 1403 bp->bp_tc_ack = 1; 1404 1405 bstp_set_other_tcprop(bp); 1406 DPRINTF("%s -> TC_TC\n", bp->bp_ifp->if_xname); 1407 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1408 break; 1409 1410 case BSTP_TCSTATE_PROPAG: 1411 /* flush routes on the parent bridge */ 1412 bp->bp_fdbflush = 1; 1413 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask); 1414 bp->bp_tc_prop = 0; 1415 bstp_set_timer_tc(bp); 1416 DPRINTF("%s -> TC_PROPAG\n", bp->bp_ifp->if_xname); 1417 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1418 break; 1419 1420 case BSTP_TCSTATE_ACK: 1421 bstp_timer_stop(&bp->bp_tc_timer); 1422 bp->bp_rcvdtca = 0; 1423 DPRINTF("%s -> TC_ACK\n", bp->bp_ifp->if_xname); 1424 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1425 break; 1426 } 1427 } 1428 1429 static void 1430 bstp_set_timer_tc(struct bstp_port *bp) 1431 { 1432 struct bstp_state *bs = bp->bp_bs; 1433 1434 if (bp->bp_tc_timer.active) 1435 return; 1436 1437 switch (bp->bp_protover) { 1438 case BSTP_PROTO_RSTP: 1439 bstp_timer_start(&bp->bp_tc_timer, 1440 bp->bp_desg_htime + BSTP_TICK_VAL); 1441 bp->bp_flags |= BSTP_PORT_NEWINFO; 1442 break; 1443 1444 case BSTP_PROTO_STP: 1445 bstp_timer_start(&bp->bp_tc_timer, 1446 bs->bs_root_max_age + bs->bs_root_fdelay); 1447 break; 1448 } 1449 } 1450 1451 static void 1452 bstp_set_timer_msgage(struct bstp_port *bp) 1453 { 1454 if (bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR <= 1455 bp->bp_port_max_age) { 1456 bstp_timer_start(&bp->bp_message_age_timer, 1457 bp->bp_port_htime * 3); 1458 } else 1459 /* expires immediately */ 1460 bstp_timer_start(&bp->bp_message_age_timer, 0); 1461 } 1462 1463 static int 1464 bstp_rerooted(struct bstp_state *bs, struct bstp_port *bp) 1465 { 1466 struct bstp_port *bp2; 1467 int rr_set = 0; 1468 1469 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1470 if (bp2 == bp) 1471 continue; 1472 if (bp2->bp_recent_root_timer.active) { 1473 rr_set = 1; 1474 break; 1475 } 1476 } 1477 return (!rr_set); 1478 } 1479 1480 int 1481 bstp_set_htime(struct bstp_state *bs, int t) 1482 { 1483 /* convert seconds to ticks */ 1484 t *= BSTP_TICK_VAL; 1485 1486 /* value can only be changed in leagacy stp mode */ 1487 if (bs->bs_protover != BSTP_PROTO_STP) 1488 return (EPERM); 1489 1490 if (t < BSTP_MIN_HELLO_TIME || t > BSTP_MAX_HELLO_TIME) 1491 return (EINVAL); 1492 1493 BSTP_LOCK(bs); 1494 bs->bs_bridge_htime = t; 1495 bstp_reinit(bs); 1496 BSTP_UNLOCK(bs); 1497 return (0); 1498 } 1499 1500 int 1501 bstp_set_fdelay(struct bstp_state *bs, int t) 1502 { 1503 /* convert seconds to ticks */ 1504 t *= BSTP_TICK_VAL; 1505 1506 if (t < BSTP_MIN_FORWARD_DELAY || t > BSTP_MAX_FORWARD_DELAY) 1507 return (EINVAL); 1508 1509 BSTP_LOCK(bs); 1510 bs->bs_bridge_fdelay = t; 1511 bstp_reinit(bs); 1512 BSTP_UNLOCK(bs); 1513 return (0); 1514 } 1515 1516 int 1517 bstp_set_maxage(struct bstp_state *bs, int t) 1518 { 1519 /* convert seconds to ticks */ 1520 t *= BSTP_TICK_VAL; 1521 1522 if (t < BSTP_MIN_MAX_AGE || t > BSTP_MAX_MAX_AGE) 1523 return (EINVAL); 1524 1525 BSTP_LOCK(bs); 1526 bs->bs_bridge_max_age = t; 1527 bstp_reinit(bs); 1528 BSTP_UNLOCK(bs); 1529 return (0); 1530 } 1531 1532 int 1533 bstp_set_holdcount(struct bstp_state *bs, int count) 1534 { 1535 struct bstp_port *bp; 1536 1537 if (count < BSTP_MIN_HOLD_COUNT || 1538 count > BSTP_MAX_HOLD_COUNT) 1539 return (EINVAL); 1540 1541 BSTP_LOCK(bs); 1542 bs->bs_txholdcount = count; 1543 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1544 bp->bp_txcount = 0; 1545 BSTP_UNLOCK(bs); 1546 return (0); 1547 } 1548 1549 int 1550 bstp_set_protocol(struct bstp_state *bs, int proto) 1551 { 1552 struct bstp_port *bp; 1553 1554 switch (proto) { 1555 /* Supported protocol versions */ 1556 case BSTP_PROTO_STP: 1557 case BSTP_PROTO_RSTP: 1558 break; 1559 1560 default: 1561 return (EINVAL); 1562 } 1563 1564 BSTP_LOCK(bs); 1565 bs->bs_protover = proto; 1566 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 1567 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1568 /* reinit state */ 1569 bp->bp_infois = BSTP_INFO_DISABLED; 1570 bp->bp_txcount = 0; 1571 bstp_set_port_proto(bp, bs->bs_protover); 1572 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 1573 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1574 bstp_timer_stop(&bp->bp_recent_backup_timer); 1575 } 1576 bstp_reinit(bs); 1577 BSTP_UNLOCK(bs); 1578 return (0); 1579 } 1580 1581 int 1582 bstp_set_priority(struct bstp_state *bs, int pri) 1583 { 1584 if (pri < 0 || pri > BSTP_MAX_PRIORITY) 1585 return (EINVAL); 1586 1587 /* Limit to steps of 4096 */ 1588 pri -= pri % 4096; 1589 1590 BSTP_LOCK(bs); 1591 bs->bs_bridge_priority = pri; 1592 bstp_reinit(bs); 1593 BSTP_UNLOCK(bs); 1594 return (0); 1595 } 1596 1597 int 1598 bstp_set_port_priority(struct bstp_port *bp, int pri) 1599 { 1600 struct bstp_state *bs = bp->bp_bs; 1601 1602 if (pri < 0 || pri > BSTP_MAX_PORT_PRIORITY) 1603 return (EINVAL); 1604 1605 /* Limit to steps of 16 */ 1606 pri -= pri % 16; 1607 1608 BSTP_LOCK(bs); 1609 bp->bp_priority = pri; 1610 bstp_reinit(bs); 1611 BSTP_UNLOCK(bs); 1612 return (0); 1613 } 1614 1615 int 1616 bstp_set_path_cost(struct bstp_port *bp, uint32_t path_cost) 1617 { 1618 struct bstp_state *bs = bp->bp_bs; 1619 1620 if (path_cost > BSTP_MAX_PATH_COST) 1621 return (EINVAL); 1622 1623 /* STP compat mode only uses 16 bits of the 32 */ 1624 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1625 path_cost = 65535; 1626 1627 BSTP_LOCK(bs); 1628 1629 if (path_cost == 0) { /* use auto */ 1630 bp->bp_flags &= ~BSTP_PORT_ADMCOST; 1631 bp->bp_path_cost = bstp_calc_path_cost(bp); 1632 } else { 1633 bp->bp_path_cost = path_cost; 1634 bp->bp_flags |= BSTP_PORT_ADMCOST; 1635 } 1636 bstp_reinit(bs); 1637 BSTP_UNLOCK(bs); 1638 return (0); 1639 } 1640 1641 int 1642 bstp_set_edge(struct bstp_port *bp, int set) 1643 { 1644 struct bstp_state *bs = bp->bp_bs; 1645 1646 BSTP_LOCK(bs); 1647 if ((bp->bp_operedge = set) == 0) 1648 bp->bp_flags &= ~BSTP_PORT_ADMEDGE; 1649 else 1650 bp->bp_flags |= BSTP_PORT_ADMEDGE; 1651 BSTP_UNLOCK(bs); 1652 return (0); 1653 } 1654 1655 int 1656 bstp_set_autoedge(struct bstp_port *bp, int set) 1657 { 1658 struct bstp_state *bs = bp->bp_bs; 1659 1660 BSTP_LOCK(bs); 1661 if (set) { 1662 bp->bp_flags |= BSTP_PORT_AUTOEDGE; 1663 /* we may be able to transition straight to edge */ 1664 if (bp->bp_edge_delay_timer.active == 0) 1665 bstp_edge_delay_expiry(bs, bp); 1666 } else 1667 bp->bp_flags &= ~BSTP_PORT_AUTOEDGE; 1668 BSTP_UNLOCK(bs); 1669 return (0); 1670 } 1671 1672 int 1673 bstp_set_ptp(struct bstp_port *bp, int set) 1674 { 1675 struct bstp_state *bs = bp->bp_bs; 1676 1677 BSTP_LOCK(bs); 1678 bp->bp_ptp_link = set; 1679 BSTP_UNLOCK(bs); 1680 return (0); 1681 } 1682 1683 int 1684 bstp_set_autoptp(struct bstp_port *bp, int set) 1685 { 1686 struct bstp_state *bs = bp->bp_bs; 1687 1688 BSTP_LOCK(bs); 1689 if (set) { 1690 bp->bp_flags |= BSTP_PORT_AUTOPTP; 1691 if (bp->bp_role != BSTP_ROLE_DISABLED) 1692 bstp_ifupdstatus(bs, bp); 1693 } else 1694 bp->bp_flags &= ~BSTP_PORT_AUTOPTP; 1695 BSTP_UNLOCK(bs); 1696 return (0); 1697 } 1698 1699 /* 1700 * Calculate the path cost according to the link speed. 1701 */ 1702 static uint32_t 1703 bstp_calc_path_cost(struct bstp_port *bp) 1704 { 1705 struct ifnet *ifp = bp->bp_ifp; 1706 uint32_t path_cost; 1707 1708 /* If the priority has been manually set then retain the value */ 1709 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1710 return bp->bp_path_cost; 1711 1712 if (ifp->if_link_state == LINK_STATE_DOWN) { 1713 /* Recalc when the link comes up again */ 1714 bp->bp_flags |= BSTP_PORT_PNDCOST; 1715 return (BSTP_DEFAULT_PATH_COST); 1716 } 1717 1718 if (ifp->if_baudrate < 1000) 1719 return (BSTP_DEFAULT_PATH_COST); 1720 1721 /* formula from section 17.14, IEEE Std 802.1D-2004 */ 1722 path_cost = 20000000000ULL / (ifp->if_baudrate / 1000); 1723 1724 if (path_cost > BSTP_MAX_PATH_COST) 1725 path_cost = BSTP_MAX_PATH_COST; 1726 1727 /* STP compat mode only uses 16 bits of the 32 */ 1728 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1729 path_cost = 65535; 1730 1731 return (path_cost); 1732 } 1733 1734 /* 1735 * Notify the bridge that a port state has changed, we need to do this from a 1736 * taskqueue to avoid a LOR. 1737 */ 1738 static void 1739 bstp_notify_state(void *arg, int pending) 1740 { 1741 struct bstp_port *bp = (struct bstp_port *)arg; 1742 struct bstp_state *bs = bp->bp_bs; 1743 1744 if (bp->bp_active == 1 && bs->bs_state_cb != NULL) 1745 (*bs->bs_state_cb)(bp->bp_ifp, bp->bp_state); 1746 } 1747 1748 /* 1749 * Flush the routes on the bridge port, we need to do this from a 1750 * taskqueue to avoid a LOR. 1751 */ 1752 static void 1753 bstp_notify_rtage(void *arg, int pending) 1754 { 1755 struct bstp_port *bp = (struct bstp_port *)arg; 1756 struct bstp_state *bs = bp->bp_bs; 1757 int age = 0; 1758 1759 BSTP_LOCK(bs); 1760 switch (bp->bp_protover) { 1761 case BSTP_PROTO_STP: 1762 /* convert to seconds */ 1763 age = bp->bp_desg_fdelay / BSTP_TICK_VAL; 1764 break; 1765 1766 case BSTP_PROTO_RSTP: 1767 age = 0; 1768 break; 1769 } 1770 BSTP_UNLOCK(bs); 1771 1772 if (bp->bp_active == 1 && bs->bs_rtage_cb != NULL) 1773 (*bs->bs_rtage_cb)(bp->bp_ifp, age); 1774 1775 /* flush is complete */ 1776 BSTP_LOCK(bs); 1777 bp->bp_fdbflush = 0; 1778 BSTP_UNLOCK(bs); 1779 } 1780 1781 void 1782 bstp_linkstate(struct ifnet *ifp, int state) 1783 { 1784 struct bstp_state *bs; 1785 struct bstp_port *bp; 1786 1787 /* search for the stp port */ 1788 mtx_lock(&bstp_list_mtx); 1789 LIST_FOREACH(bs, &bstp_list, bs_list) { 1790 BSTP_LOCK(bs); 1791 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1792 if (bp->bp_ifp == ifp) { 1793 bstp_ifupdstatus(bs, bp); 1794 bstp_update_state(bs, bp); 1795 /* it only exists once so return */ 1796 BSTP_UNLOCK(bs); 1797 mtx_unlock(&bstp_list_mtx); 1798 return; 1799 } 1800 } 1801 BSTP_UNLOCK(bs); 1802 } 1803 mtx_unlock(&bstp_list_mtx); 1804 } 1805 1806 static void 1807 bstp_ifupdstatus(struct bstp_state *bs, struct bstp_port *bp) 1808 { 1809 struct ifnet *ifp = bp->bp_ifp; 1810 struct ifmediareq ifmr; 1811 int error = 0; 1812 1813 BSTP_LOCK_ASSERT(bs); 1814 1815 bzero((char *)&ifmr, sizeof(ifmr)); 1816 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr); 1817 1818 if ((error == 0) && (ifp->if_flags & IFF_UP)) { 1819 if (ifmr.ifm_status & IFM_ACTIVE) { 1820 /* A full-duplex link is assumed to be point to point */ 1821 if (bp->bp_flags & BSTP_PORT_AUTOPTP) { 1822 bp->bp_ptp_link = 1823 ifmr.ifm_active & IFM_FDX ? 1 : 0; 1824 } 1825 1826 /* Calc the cost if the link was down previously */ 1827 if (bp->bp_flags & BSTP_PORT_PNDCOST) { 1828 bp->bp_path_cost = bstp_calc_path_cost(bp); 1829 bp->bp_flags &= ~BSTP_PORT_PNDCOST; 1830 } 1831 1832 if (bp->bp_role == BSTP_ROLE_DISABLED) 1833 bstp_enable_port(bs, bp); 1834 } else { 1835 if (bp->bp_role != BSTP_ROLE_DISABLED) { 1836 bstp_disable_port(bs, bp); 1837 if ((bp->bp_flags & BSTP_PORT_ADMEDGE) && 1838 bp->bp_protover == BSTP_PROTO_RSTP) 1839 bp->bp_operedge = 1; 1840 } 1841 } 1842 return; 1843 } 1844 1845 if (bp->bp_infois != BSTP_INFO_DISABLED) 1846 bstp_disable_port(bs, bp); 1847 } 1848 1849 static void 1850 bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp) 1851 { 1852 bp->bp_infois = BSTP_INFO_AGED; 1853 bstp_assign_roles(bs); 1854 } 1855 1856 static void 1857 bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp) 1858 { 1859 bp->bp_infois = BSTP_INFO_DISABLED; 1860 bstp_assign_roles(bs); 1861 } 1862 1863 static void 1864 bstp_tick(void *arg) 1865 { 1866 struct bstp_state *bs = arg; 1867 struct bstp_port *bp; 1868 1869 BSTP_LOCK_ASSERT(bs); 1870 1871 if (bs->bs_running == 0) 1872 return; 1873 1874 /* slow timer to catch missed link events */ 1875 if (bstp_timer_expired(&bs->bs_link_timer)) { 1876 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1877 bstp_ifupdstatus(bs, bp); 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_expired(&bp->bp_tc_timer); 1884 bstp_timer_expired(&bp->bp_recent_root_timer); 1885 bstp_timer_expired(&bp->bp_forward_delay_timer); 1886 bstp_timer_expired(&bp->bp_recent_backup_timer); 1887 1888 if (bstp_timer_expired(&bp->bp_hello_timer)) 1889 bstp_hello_timer_expiry(bs, bp); 1890 1891 if (bstp_timer_expired(&bp->bp_message_age_timer)) 1892 bstp_message_age_expiry(bs, bp); 1893 1894 if (bstp_timer_expired(&bp->bp_migrate_delay_timer)) 1895 bstp_migrate_delay_expiry(bs, bp); 1896 1897 if (bstp_timer_expired(&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 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 1908 } 1909 1910 static void 1911 bstp_timer_start(struct bstp_timer *t, uint16_t v) 1912 { 1913 t->value = v; 1914 t->active = 1; 1915 t->latched = 0; 1916 } 1917 1918 static void 1919 bstp_timer_stop(struct bstp_timer *t) 1920 { 1921 t->value = 0; 1922 t->active = 0; 1923 t->latched = 0; 1924 } 1925 1926 static void 1927 bstp_timer_latch(struct bstp_timer *t) 1928 { 1929 t->latched = 1; 1930 t->active = 1; 1931 } 1932 1933 static int 1934 bstp_timer_expired(struct bstp_timer *t) 1935 { 1936 if (t->active == 0 || t->latched) 1937 return (0); 1938 t->value -= BSTP_TICK_VAL; 1939 if (t->value <= 0) { 1940 bstp_timer_stop(t); 1941 return (1); 1942 } 1943 return (0); 1944 } 1945 1946 static void 1947 bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp) 1948 { 1949 if ((bp->bp_flags & BSTP_PORT_NEWINFO) || 1950 bp->bp_role == BSTP_ROLE_DESIGNATED || 1951 (bp->bp_role == BSTP_ROLE_ROOT && 1952 bp->bp_tc_timer.active == 1)) { 1953 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 1954 bp->bp_flags |= BSTP_PORT_NEWINFO; 1955 bstp_transmit(bs, bp); 1956 } 1957 } 1958 1959 static void 1960 bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp) 1961 { 1962 if (bp->bp_infois == BSTP_INFO_RECIEVED) { 1963 bp->bp_infois = BSTP_INFO_AGED; 1964 bstp_assign_roles(bs); 1965 DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname); 1966 } 1967 } 1968 1969 static void 1970 bstp_migrate_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 1971 { 1972 bp->bp_flags |= BSTP_PORT_CANMIGRATE; 1973 } 1974 1975 static void 1976 bstp_edge_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 1977 { 1978 if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) && 1979 bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing && 1980 bp->bp_role == BSTP_ROLE_DESIGNATED) { 1981 bp->bp_operedge = 1; 1982 DPRINTF("%s -> edge port\n", bp->bp_ifp->if_xname); 1983 } 1984 } 1985 1986 static int 1987 bstp_addr_cmp(const uint8_t *a, const uint8_t *b) 1988 { 1989 int i, d; 1990 1991 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 1992 d = ((int)a[i]) - ((int)b[i]); 1993 } 1994 1995 return (d); 1996 } 1997 1998 /* 1999 * compare the bridge address component of the bridgeid 2000 */ 2001 static int 2002 bstp_same_bridgeid(uint64_t id1, uint64_t id2) 2003 { 2004 u_char addr1[ETHER_ADDR_LEN]; 2005 u_char addr2[ETHER_ADDR_LEN]; 2006 2007 PV2ADDR(id1, addr1); 2008 PV2ADDR(id2, addr2); 2009 2010 if (bstp_addr_cmp(addr1, addr2) == 0) 2011 return (1); 2012 2013 return (0); 2014 } 2015 2016 void 2017 bstp_reinit(struct bstp_state *bs) 2018 { 2019 struct bstp_port *bp; 2020 struct ifnet *ifp, *mif; 2021 u_char *e_addr; 2022 static const u_char llzero[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 2023 2024 BSTP_LOCK_ASSERT(bs); 2025 2026 mif = NULL; 2027 /* 2028 * Search through the Ethernet adapters and find the one with the 2029 * lowest value. The adapter which we take the MAC address from does 2030 * not need to be part of the bridge, it just needs to be a unique 2031 * value. 2032 */ 2033 IFNET_RLOCK(); 2034 TAILQ_FOREACH(ifp, &ifnet, if_link) { 2035 if (ifp->if_type != IFT_ETHER) 2036 continue; 2037 2038 if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0) 2039 continue; 2040 2041 if (mif == NULL) { 2042 mif = ifp; 2043 continue; 2044 } 2045 if (bstp_addr_cmp(IF_LLADDR(ifp), IF_LLADDR(mif)) < 0) { 2046 mif = ifp; 2047 continue; 2048 } 2049 } 2050 IFNET_RUNLOCK(); 2051 2052 if (LIST_EMPTY(&bs->bs_bplist) || mif == NULL) { 2053 /* Set the bridge and root id (lower bits) to zero */ 2054 bs->bs_bridge_pv.pv_dbridge_id = 2055 ((uint64_t)bs->bs_bridge_priority) << 48; 2056 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2057 bs->bs_root_pv = bs->bs_bridge_pv; 2058 /* Disable any remaining ports, they will have no MAC address */ 2059 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2060 bp->bp_infois = BSTP_INFO_DISABLED; 2061 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2062 } 2063 callout_stop(&bs->bs_bstpcallout); 2064 return; 2065 } 2066 2067 e_addr = IF_LLADDR(mif); 2068 bs->bs_bridge_pv.pv_dbridge_id = 2069 (((uint64_t)bs->bs_bridge_priority) << 48) | 2070 (((uint64_t)e_addr[0]) << 40) | 2071 (((uint64_t)e_addr[1]) << 32) | 2072 (((uint64_t)e_addr[2]) << 24) | 2073 (((uint64_t)e_addr[3]) << 16) | 2074 (((uint64_t)e_addr[4]) << 8) | 2075 (((uint64_t)e_addr[5])); 2076 2077 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2078 bs->bs_bridge_pv.pv_cost = 0; 2079 bs->bs_bridge_pv.pv_dport_id = 0; 2080 bs->bs_bridge_pv.pv_port_id = 0; 2081 2082 if (bs->bs_running && callout_pending(&bs->bs_bstpcallout) == 0) 2083 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2084 2085 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2086 bp->bp_port_id = (bp->bp_priority << 8) | 2087 (bp->bp_ifp->if_index & 0xfff); 2088 bstp_ifupdstatus(bs, bp); 2089 } 2090 2091 bstp_assign_roles(bs); 2092 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 2093 } 2094 2095 static int 2096 bstp_modevent(module_t mod, int type, void *data) 2097 { 2098 switch (type) { 2099 case MOD_LOAD: 2100 mtx_init(&bstp_list_mtx, "bridgestp list", NULL, MTX_DEF); 2101 LIST_INIT(&bstp_list); 2102 bstp_linkstate_p = bstp_linkstate; 2103 break; 2104 case MOD_UNLOAD: 2105 bstp_linkstate_p = NULL; 2106 mtx_destroy(&bstp_list_mtx); 2107 break; 2108 default: 2109 return (EOPNOTSUPP); 2110 } 2111 return (0); 2112 } 2113 2114 static moduledata_t bstp_mod = { 2115 "bridgestp", 2116 bstp_modevent, 2117 0 2118 }; 2119 2120 DECLARE_MODULE(bridgestp, bstp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2121 MODULE_VERSION(bridgestp, 1); 2122 2123 void 2124 bstp_attach(struct bstp_state *bs, struct bstp_cb_ops *cb) 2125 { 2126 BSTP_LOCK_INIT(bs); 2127 callout_init_mtx(&bs->bs_bstpcallout, &bs->bs_mtx, 0); 2128 LIST_INIT(&bs->bs_bplist); 2129 2130 bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 2131 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 2132 bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY; 2133 bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 2134 bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME; 2135 bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY; 2136 bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT; 2137 bs->bs_protover = BSTP_PROTO_RSTP; 2138 bs->bs_state_cb = cb->bcb_state; 2139 bs->bs_rtage_cb = cb->bcb_rtage; 2140 2141 getmicrotime(&bs->bs_last_tc_time); 2142 2143 mtx_lock(&bstp_list_mtx); 2144 LIST_INSERT_HEAD(&bstp_list, bs, bs_list); 2145 mtx_unlock(&bstp_list_mtx); 2146 } 2147 2148 void 2149 bstp_detach(struct bstp_state *bs) 2150 { 2151 KASSERT(LIST_EMPTY(&bs->bs_bplist), ("bstp still active")); 2152 2153 mtx_lock(&bstp_list_mtx); 2154 LIST_REMOVE(bs, bs_list); 2155 mtx_unlock(&bstp_list_mtx); 2156 callout_drain(&bs->bs_bstpcallout); 2157 BSTP_LOCK_DESTROY(bs); 2158 } 2159 2160 void 2161 bstp_init(struct bstp_state *bs) 2162 { 2163 BSTP_LOCK(bs); 2164 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2165 bs->bs_running = 1; 2166 bstp_reinit(bs); 2167 BSTP_UNLOCK(bs); 2168 } 2169 2170 void 2171 bstp_stop(struct bstp_state *bs) 2172 { 2173 struct bstp_port *bp; 2174 2175 BSTP_LOCK(bs); 2176 2177 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 2178 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2179 2180 bs->bs_running = 0; 2181 callout_stop(&bs->bs_bstpcallout); 2182 BSTP_UNLOCK(bs); 2183 } 2184 2185 int 2186 bstp_create(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *ifp) 2187 { 2188 bzero(bp, sizeof(struct bstp_port)); 2189 2190 BSTP_LOCK(bs); 2191 bp->bp_ifp = ifp; 2192 bp->bp_bs = bs; 2193 bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY; 2194 TASK_INIT(&bp->bp_statetask, 0, bstp_notify_state, bp); 2195 TASK_INIT(&bp->bp_rtagetask, 0, bstp_notify_rtage, bp); 2196 2197 /* Init state */ 2198 bp->bp_infois = BSTP_INFO_DISABLED; 2199 bp->bp_flags = BSTP_PORT_AUTOEDGE|BSTP_PORT_AUTOPTP; 2200 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2201 bstp_set_port_proto(bp, bs->bs_protover); 2202 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2203 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 2204 bp->bp_path_cost = bstp_calc_path_cost(bp); 2205 BSTP_UNLOCK(bs); 2206 return (0); 2207 } 2208 2209 int 2210 bstp_enable(struct bstp_port *bp) 2211 { 2212 struct bstp_state *bs = bp->bp_bs; 2213 struct ifnet *ifp = bp->bp_ifp; 2214 2215 KASSERT(bp->bp_active == 0, ("already a bstp member")); 2216 2217 switch (ifp->if_type) { 2218 case IFT_ETHER: /* These can do spanning tree. */ 2219 break; 2220 default: 2221 /* Nothing else can. */ 2222 return (EINVAL); 2223 } 2224 2225 BSTP_LOCK(bs); 2226 LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next); 2227 bp->bp_active = 1; 2228 bp->bp_flags |= BSTP_PORT_NEWINFO; 2229 bstp_reinit(bs); 2230 bstp_update_roles(bs, bp); 2231 BSTP_UNLOCK(bs); 2232 return (0); 2233 } 2234 2235 void 2236 bstp_disable(struct bstp_port *bp) 2237 { 2238 struct bstp_state *bs = bp->bp_bs; 2239 2240 KASSERT(bp->bp_active == 1, ("not a bstp member")); 2241 2242 BSTP_LOCK(bs); 2243 bstp_disable_port(bs, bp); 2244 LIST_REMOVE(bp, bp_next); 2245 bp->bp_active = 0; 2246 bstp_reinit(bs); 2247 BSTP_UNLOCK(bs); 2248 } 2249 2250 /* 2251 * The bstp_port structure is about to be freed by the parent bridge. 2252 */ 2253 void 2254 bstp_destroy(struct bstp_port *bp) 2255 { 2256 KASSERT(bp->bp_active == 0, ("port is still attached")); 2257 taskqueue_drain(taskqueue_swi, &bp->bp_statetask); 2258 taskqueue_drain(taskqueue_swi, &bp->bp_rtagetask); 2259 }
Cache object: 1ec91661064effac9a7cb5606599a096
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