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