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