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 "opt_route.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/mbuf.h> 45 #include <sys/socket.h> 46 #include <sys/sockio.h> 47 #include <sys/kernel.h> 48 #include <sys/callout.h> 49 #include <sys/module.h> 50 #include <sys/proc.h> 51 #include <sys/lock.h> 52 #include <sys/mutex.h> 53 #include <sys/taskqueue.h> 54 #include <sys/vimage.h> 55 56 #include <net/if.h> 57 #include <net/if_dl.h> 58 #include <net/if_types.h> 59 #include <net/if_llc.h> 60 #include <net/if_media.h> 61 #include <net/route.h> 62 #include <net/vnet.h> 63 64 #include <netinet/in.h> 65 #include <netinet/in_systm.h> 66 #include <netinet/in_var.h> 67 #include <netinet/if_ether.h> 68 #include <net/bridgestp.h> 69 70 #ifdef BRIDGESTP_DEBUG 71 #define DPRINTF(fmt, arg...) printf("bstp: " fmt, ##arg) 72 #else 73 #define DPRINTF(fmt, arg...) 74 #endif 75 76 #define PV2ADDR(pv, eaddr) do { \ 77 eaddr[0] = pv >> 40; \ 78 eaddr[1] = pv >> 32; \ 79 eaddr[2] = pv >> 24; \ 80 eaddr[3] = pv >> 16; \ 81 eaddr[4] = pv >> 8; \ 82 eaddr[5] = pv >> 0; \ 83 } while (0) 84 85 #define INFO_BETTER 1 86 #define INFO_SAME 0 87 #define INFO_WORSE -1 88 89 const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; 90 91 LIST_HEAD(, bstp_state) bstp_list; 92 static struct mtx bstp_list_mtx; 93 94 static void bstp_transmit(struct bstp_state *, struct bstp_port *); 95 static void bstp_transmit_bpdu(struct bstp_state *, struct bstp_port *); 96 static void bstp_transmit_tcn(struct bstp_state *, struct bstp_port *); 97 static void bstp_decode_bpdu(struct bstp_port *, struct bstp_cbpdu *, 98 struct bstp_config_unit *); 99 static void bstp_send_bpdu(struct bstp_state *, struct bstp_port *, 100 struct bstp_cbpdu *); 101 static void bstp_enqueue(struct ifnet *, struct mbuf *); 102 static int bstp_pdu_flags(struct bstp_port *); 103 static void bstp_received_stp(struct bstp_state *, struct bstp_port *, 104 struct mbuf **, struct bstp_tbpdu *); 105 static void bstp_received_rstp(struct bstp_state *, struct bstp_port *, 106 struct mbuf **, struct bstp_tbpdu *); 107 static void bstp_received_tcn(struct bstp_state *, struct bstp_port *, 108 struct bstp_tcn_unit *); 109 static void bstp_received_bpdu(struct bstp_state *, struct bstp_port *, 110 struct bstp_config_unit *); 111 static int bstp_pdu_rcvtype(struct bstp_port *, struct bstp_config_unit *); 112 static int bstp_pdu_bettersame(struct bstp_port *, int); 113 static int bstp_info_cmp(struct bstp_pri_vector *, 114 struct bstp_pri_vector *); 115 static int bstp_info_superior(struct bstp_pri_vector *, 116 struct bstp_pri_vector *); 117 static void bstp_assign_roles(struct bstp_state *); 118 static void bstp_update_roles(struct bstp_state *, struct bstp_port *); 119 static void bstp_update_state(struct bstp_state *, struct bstp_port *); 120 static void bstp_update_tc(struct bstp_port *); 121 static void bstp_update_info(struct bstp_port *); 122 static void bstp_set_other_tcprop(struct bstp_port *); 123 static void bstp_set_all_reroot(struct bstp_state *); 124 static void bstp_set_all_sync(struct bstp_state *); 125 static void bstp_set_port_state(struct bstp_port *, int); 126 static void bstp_set_port_role(struct bstp_port *, int); 127 static void bstp_set_port_proto(struct bstp_port *, int); 128 static void bstp_set_port_tc(struct bstp_port *, int); 129 static void bstp_set_timer_tc(struct bstp_port *); 130 static void bstp_set_timer_msgage(struct bstp_port *); 131 static int bstp_rerooted(struct bstp_state *, struct bstp_port *); 132 static uint32_t bstp_calc_path_cost(struct bstp_port *); 133 static void bstp_notify_state(void *, int); 134 static void bstp_notify_rtage(void *, int); 135 static void bstp_ifupdstatus(struct bstp_state *, struct bstp_port *); 136 static void bstp_enable_port(struct bstp_state *, struct bstp_port *); 137 static void bstp_disable_port(struct bstp_state *, struct bstp_port *); 138 static void bstp_tick(void *); 139 static void bstp_timer_start(struct bstp_timer *, uint16_t); 140 static void bstp_timer_stop(struct bstp_timer *); 141 static void bstp_timer_latch(struct bstp_timer *); 142 static int bstp_timer_expired(struct bstp_timer *); 143 static void bstp_hello_timer_expiry(struct bstp_state *, 144 struct bstp_port *); 145 static void bstp_message_age_expiry(struct bstp_state *, 146 struct bstp_port *); 147 static void bstp_migrate_delay_expiry(struct bstp_state *, 148 struct bstp_port *); 149 static void bstp_edge_delay_expiry(struct bstp_state *, 150 struct bstp_port *); 151 static int bstp_addr_cmp(const uint8_t *, const uint8_t *); 152 static int bstp_same_bridgeid(uint64_t, uint64_t); 153 static void bstp_reinit(struct bstp_state *); 154 155 static void 156 bstp_transmit(struct bstp_state *bs, struct bstp_port *bp) 157 { 158 if (bs->bs_running == 0) 159 return; 160 161 /* 162 * a PDU can only be sent if we have tx quota left and the 163 * hello timer is running. 164 */ 165 if (bp->bp_hello_timer.active == 0) { 166 /* Test if it needs to be reset */ 167 bstp_hello_timer_expiry(bs, bp); 168 return; 169 } 170 if (bp->bp_txcount > bs->bs_txholdcount) 171 /* Ran out of karma */ 172 return; 173 174 if (bp->bp_protover == BSTP_PROTO_RSTP) { 175 bstp_transmit_bpdu(bs, bp); 176 bp->bp_tc_ack = 0; 177 } else { /* STP */ 178 switch (bp->bp_role) { 179 case BSTP_ROLE_DESIGNATED: 180 bstp_transmit_bpdu(bs, bp); 181 bp->bp_tc_ack = 0; 182 break; 183 184 case BSTP_ROLE_ROOT: 185 bstp_transmit_tcn(bs, bp); 186 break; 187 } 188 } 189 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 190 bp->bp_flags &= ~BSTP_PORT_NEWINFO; 191 } 192 193 static void 194 bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp) 195 { 196 struct bstp_cbpdu bpdu; 197 198 BSTP_LOCK_ASSERT(bs); 199 200 bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48); 201 PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr); 202 203 bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost); 204 205 bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48); 206 PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr); 207 208 bpdu.cbu_portid = htons(bp->bp_port_id); 209 bpdu.cbu_messageage = htons(bp->bp_desg_msg_age); 210 bpdu.cbu_maxage = htons(bp->bp_desg_max_age); 211 bpdu.cbu_hellotime = htons(bp->bp_desg_htime); 212 bpdu.cbu_forwarddelay = htons(bp->bp_desg_fdelay); 213 214 bpdu.cbu_flags = bstp_pdu_flags(bp); 215 216 switch (bp->bp_protover) { 217 case BSTP_PROTO_STP: 218 bpdu.cbu_bpdutype = BSTP_MSGTYPE_CFG; 219 break; 220 221 case BSTP_PROTO_RSTP: 222 bpdu.cbu_bpdutype = BSTP_MSGTYPE_RSTP; 223 break; 224 } 225 226 bstp_send_bpdu(bs, bp, &bpdu); 227 } 228 229 static void 230 bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp) 231 { 232 struct bstp_tbpdu bpdu; 233 struct ifnet *ifp = bp->bp_ifp; 234 struct ether_header *eh; 235 struct mbuf *m; 236 237 KASSERT(bp == bs->bs_root_port, ("%s: bad root port\n", __func__)); 238 239 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 240 return; 241 242 MGETHDR(m, M_DONTWAIT, MT_DATA); 243 if (m == NULL) 244 return; 245 246 m->m_pkthdr.rcvif = ifp; 247 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); 248 m->m_len = m->m_pkthdr.len; 249 250 eh = mtod(m, struct ether_header *); 251 252 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); 253 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 254 eh->ether_type = htons(sizeof(bpdu)); 255 256 bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP; 257 bpdu.tbu_ctl = LLC_UI; 258 bpdu.tbu_protoid = 0; 259 bpdu.tbu_protover = 0; 260 bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN; 261 262 memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu)); 263 264 bp->bp_txcount++; 265 bstp_enqueue(ifp, m); 266 } 267 268 static void 269 bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu, 270 struct bstp_config_unit *cu) 271 { 272 int flags; 273 274 cu->cu_pv.pv_root_id = 275 (((uint64_t)ntohs(cpdu->cbu_rootpri)) << 48) | 276 (((uint64_t)cpdu->cbu_rootaddr[0]) << 40) | 277 (((uint64_t)cpdu->cbu_rootaddr[1]) << 32) | 278 (((uint64_t)cpdu->cbu_rootaddr[2]) << 24) | 279 (((uint64_t)cpdu->cbu_rootaddr[3]) << 16) | 280 (((uint64_t)cpdu->cbu_rootaddr[4]) << 8) | 281 (((uint64_t)cpdu->cbu_rootaddr[5]) << 0); 282 283 cu->cu_pv.pv_dbridge_id = 284 (((uint64_t)ntohs(cpdu->cbu_bridgepri)) << 48) | 285 (((uint64_t)cpdu->cbu_bridgeaddr[0]) << 40) | 286 (((uint64_t)cpdu->cbu_bridgeaddr[1]) << 32) | 287 (((uint64_t)cpdu->cbu_bridgeaddr[2]) << 24) | 288 (((uint64_t)cpdu->cbu_bridgeaddr[3]) << 16) | 289 (((uint64_t)cpdu->cbu_bridgeaddr[4]) << 8) | 290 (((uint64_t)cpdu->cbu_bridgeaddr[5]) << 0); 291 292 cu->cu_pv.pv_cost = ntohl(cpdu->cbu_rootpathcost); 293 cu->cu_message_age = ntohs(cpdu->cbu_messageage); 294 cu->cu_max_age = ntohs(cpdu->cbu_maxage); 295 cu->cu_hello_time = ntohs(cpdu->cbu_hellotime); 296 cu->cu_forward_delay = ntohs(cpdu->cbu_forwarddelay); 297 cu->cu_pv.pv_dport_id = ntohs(cpdu->cbu_portid); 298 cu->cu_pv.pv_port_id = bp->bp_port_id; 299 cu->cu_message_type = cpdu->cbu_bpdutype; 300 301 /* Strip off unused flags in STP mode */ 302 flags = cpdu->cbu_flags; 303 switch (cpdu->cbu_protover) { 304 case BSTP_PROTO_STP: 305 flags &= BSTP_PDU_STPMASK; 306 /* A STP BPDU explicitly conveys a Designated Port */ 307 cu->cu_role = BSTP_ROLE_DESIGNATED; 308 break; 309 310 case BSTP_PROTO_RSTP: 311 flags &= BSTP_PDU_RSTPMASK; 312 break; 313 } 314 315 cu->cu_topology_change_ack = 316 (flags & BSTP_PDU_F_TCA) ? 1 : 0; 317 cu->cu_proposal = 318 (flags & BSTP_PDU_F_P) ? 1 : 0; 319 cu->cu_agree = 320 (flags & BSTP_PDU_F_A) ? 1 : 0; 321 cu->cu_learning = 322 (flags & BSTP_PDU_F_L) ? 1 : 0; 323 cu->cu_forwarding = 324 (flags & BSTP_PDU_F_F) ? 1 : 0; 325 cu->cu_topology_change = 326 (flags & BSTP_PDU_F_TC) ? 1 : 0; 327 328 switch ((flags & BSTP_PDU_PRMASK) >> BSTP_PDU_PRSHIFT) { 329 case BSTP_PDU_F_ROOT: 330 cu->cu_role = BSTP_ROLE_ROOT; 331 break; 332 case BSTP_PDU_F_ALT: 333 cu->cu_role = BSTP_ROLE_ALTERNATE; 334 break; 335 case BSTP_PDU_F_DESG: 336 cu->cu_role = BSTP_ROLE_DESIGNATED; 337 break; 338 } 339 } 340 341 static void 342 bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp, 343 struct bstp_cbpdu *bpdu) 344 { 345 struct ifnet *ifp; 346 struct mbuf *m; 347 struct ether_header *eh; 348 349 BSTP_LOCK_ASSERT(bs); 350 351 ifp = bp->bp_ifp; 352 353 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 354 return; 355 356 MGETHDR(m, M_DONTWAIT, MT_DATA); 357 if (m == NULL) 358 return; 359 360 eh = mtod(m, struct ether_header *); 361 362 bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP; 363 bpdu->cbu_ctl = LLC_UI; 364 bpdu->cbu_protoid = htons(BSTP_PROTO_ID); 365 366 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); 367 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 368 369 switch (bpdu->cbu_bpdutype) { 370 case BSTP_MSGTYPE_CFG: 371 bpdu->cbu_protover = BSTP_PROTO_STP; 372 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_STP_LEN; 373 eh->ether_type = htons(BSTP_BPDU_STP_LEN); 374 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, 375 BSTP_BPDU_STP_LEN); 376 break; 377 378 case BSTP_MSGTYPE_RSTP: 379 bpdu->cbu_protover = BSTP_PROTO_RSTP; 380 bpdu->cbu_versionlen = htons(0); 381 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_RSTP_LEN; 382 eh->ether_type = htons(BSTP_BPDU_RSTP_LEN); 383 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, 384 BSTP_BPDU_RSTP_LEN); 385 break; 386 387 default: 388 panic("not implemented"); 389 } 390 m->m_pkthdr.rcvif = ifp; 391 m->m_len = m->m_pkthdr.len; 392 393 bp->bp_txcount++; 394 bstp_enqueue(ifp, m); 395 } 396 397 static void 398 bstp_enqueue(struct ifnet *dst_ifp, struct mbuf *m) 399 { 400 int err = 0; 401 402 IFQ_ENQUEUE(&dst_ifp->if_snd, m, err); 403 404 if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0) 405 (*dst_ifp->if_start)(dst_ifp); 406 } 407 408 static int 409 bstp_pdu_flags(struct bstp_port *bp) 410 { 411 int flags = 0; 412 413 if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING) 414 flags |= BSTP_PDU_F_P; 415 416 if (bp->bp_agree) 417 flags |= BSTP_PDU_F_A; 418 419 if (bp->bp_tc_timer.active) 420 flags |= BSTP_PDU_F_TC; 421 422 if (bp->bp_tc_ack) 423 flags |= BSTP_PDU_F_TCA; 424 425 switch (bp->bp_state) { 426 case BSTP_IFSTATE_LEARNING: 427 flags |= BSTP_PDU_F_L; 428 break; 429 430 case BSTP_IFSTATE_FORWARDING: 431 flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F); 432 break; 433 } 434 435 switch (bp->bp_role) { 436 case BSTP_ROLE_ROOT: 437 flags |= 438 (BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT); 439 break; 440 441 case BSTP_ROLE_ALTERNATE: 442 case BSTP_ROLE_BACKUP: /* fall through */ 443 flags |= 444 (BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT); 445 break; 446 447 case BSTP_ROLE_DESIGNATED: 448 flags |= 449 (BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT); 450 break; 451 } 452 453 /* Strip off unused flags in either mode */ 454 switch (bp->bp_protover) { 455 case BSTP_PROTO_STP: 456 flags &= BSTP_PDU_STPMASK; 457 break; 458 case BSTP_PROTO_RSTP: 459 flags &= BSTP_PDU_RSTPMASK; 460 break; 461 } 462 return (flags); 463 } 464 465 struct mbuf * 466 bstp_input(struct bstp_port *bp, struct ifnet *ifp, struct mbuf *m) 467 { 468 struct bstp_state *bs = bp->bp_bs; 469 struct ether_header *eh; 470 struct bstp_tbpdu tpdu; 471 uint16_t len; 472 473 if (bp->bp_active == 0) { 474 m_freem(m); 475 return (NULL); 476 } 477 478 BSTP_LOCK(bs); 479 480 eh = mtod(m, struct ether_header *); 481 482 len = ntohs(eh->ether_type); 483 if (len < sizeof(tpdu)) 484 goto out; 485 486 m_adj(m, ETHER_HDR_LEN); 487 488 if (m->m_pkthdr.len > len) 489 m_adj(m, len - m->m_pkthdr.len); 490 if (m->m_len < sizeof(tpdu) && 491 (m = m_pullup(m, sizeof(tpdu))) == NULL) 492 goto out; 493 494 memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu)); 495 496 /* basic packet checks */ 497 if (tpdu.tbu_dsap != LLC_8021D_LSAP || 498 tpdu.tbu_ssap != LLC_8021D_LSAP || 499 tpdu.tbu_ctl != LLC_UI) 500 goto out; 501 if (tpdu.tbu_protoid != BSTP_PROTO_ID) 502 goto out; 503 504 /* 505 * We can treat later versions of the PDU as the same as the maximum 506 * version we implement. All additional parameters/flags are ignored. 507 */ 508 if (tpdu.tbu_protover > BSTP_PROTO_MAX) 509 tpdu.tbu_protover = BSTP_PROTO_MAX; 510 511 if (tpdu.tbu_protover != bp->bp_protover) { 512 /* 513 * Wait for the migration delay timer to expire before changing 514 * protocol version to avoid flip-flops. 515 */ 516 if (bp->bp_flags & BSTP_PORT_CANMIGRATE) 517 bstp_set_port_proto(bp, tpdu.tbu_protover); 518 else 519 goto out; 520 } 521 522 /* Clear operedge upon receiving a PDU on the port */ 523 bp->bp_operedge = 0; 524 bstp_timer_start(&bp->bp_edge_delay_timer, 525 BSTP_DEFAULT_MIGRATE_DELAY); 526 527 switch (tpdu.tbu_protover) { 528 case BSTP_PROTO_STP: 529 bstp_received_stp(bs, bp, &m, &tpdu); 530 break; 531 532 case BSTP_PROTO_RSTP: 533 bstp_received_rstp(bs, bp, &m, &tpdu); 534 break; 535 } 536 out: 537 BSTP_UNLOCK(bs); 538 if (m) 539 m_freem(m); 540 return (NULL); 541 } 542 543 static void 544 bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp, 545 struct mbuf **mp, struct bstp_tbpdu *tpdu) 546 { 547 struct bstp_cbpdu cpdu; 548 struct bstp_config_unit *cu = &bp->bp_msg_cu; 549 struct bstp_tcn_unit tu; 550 551 switch (tpdu->tbu_bpdutype) { 552 case BSTP_MSGTYPE_TCN: 553 tu.tu_message_type = tpdu->tbu_bpdutype; 554 bstp_received_tcn(bs, bp, &tu); 555 break; 556 case BSTP_MSGTYPE_CFG: 557 if ((*mp)->m_len < BSTP_BPDU_STP_LEN && 558 (*mp = m_pullup(*mp, BSTP_BPDU_STP_LEN)) == NULL) 559 return; 560 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_STP_LEN); 561 562 bstp_decode_bpdu(bp, &cpdu, cu); 563 bstp_received_bpdu(bs, bp, cu); 564 break; 565 } 566 } 567 568 static void 569 bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp, 570 struct mbuf **mp, struct bstp_tbpdu *tpdu) 571 { 572 struct bstp_cbpdu cpdu; 573 struct bstp_config_unit *cu = &bp->bp_msg_cu; 574 575 if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP) 576 return; 577 578 if ((*mp)->m_len < BSTP_BPDU_RSTP_LEN && 579 (*mp = m_pullup(*mp, BSTP_BPDU_RSTP_LEN)) == NULL) 580 return; 581 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_RSTP_LEN); 582 583 bstp_decode_bpdu(bp, &cpdu, cu); 584 bstp_received_bpdu(bs, bp, cu); 585 } 586 587 static void 588 bstp_received_tcn(struct bstp_state *bs, struct bstp_port *bp, 589 struct bstp_tcn_unit *tcn) 590 { 591 bp->bp_rcvdtcn = 1; 592 bstp_update_tc(bp); 593 } 594 595 static void 596 bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp, 597 struct bstp_config_unit *cu) 598 { 599 int type; 600 601 BSTP_LOCK_ASSERT(bs); 602 603 /* We need to have transitioned to INFO_MINE before proceeding */ 604 switch (bp->bp_infois) { 605 case BSTP_INFO_DISABLED: 606 case BSTP_INFO_AGED: 607 return; 608 } 609 610 type = bstp_pdu_rcvtype(bp, cu); 611 612 switch (type) { 613 case BSTP_PDU_SUPERIOR: 614 bs->bs_allsynced = 0; 615 bp->bp_agreed = 0; 616 bp->bp_proposing = 0; 617 618 if (cu->cu_proposal && cu->cu_forwarding == 0) 619 bp->bp_proposed = 1; 620 if (cu->cu_topology_change) 621 bp->bp_rcvdtc = 1; 622 if (cu->cu_topology_change_ack) 623 bp->bp_rcvdtca = 1; 624 625 if (bp->bp_agree && 626 !bstp_pdu_bettersame(bp, BSTP_INFO_RECEIVED)) 627 bp->bp_agree = 0; 628 629 /* copy the received priority and timers to the port */ 630 bp->bp_port_pv = cu->cu_pv; 631 bp->bp_port_msg_age = cu->cu_message_age; 632 bp->bp_port_max_age = cu->cu_max_age; 633 bp->bp_port_fdelay = cu->cu_forward_delay; 634 bp->bp_port_htime = 635 (cu->cu_hello_time > BSTP_MIN_HELLO_TIME ? 636 cu->cu_hello_time : BSTP_MIN_HELLO_TIME); 637 638 /* set expiry for the new info */ 639 bstp_set_timer_msgage(bp); 640 641 bp->bp_infois = BSTP_INFO_RECEIVED; 642 bstp_assign_roles(bs); 643 break; 644 645 case BSTP_PDU_REPEATED: 646 if (cu->cu_proposal && cu->cu_forwarding == 0) 647 bp->bp_proposed = 1; 648 if (cu->cu_topology_change) 649 bp->bp_rcvdtc = 1; 650 if (cu->cu_topology_change_ack) 651 bp->bp_rcvdtca = 1; 652 653 /* rearm the age timer */ 654 bstp_set_timer_msgage(bp); 655 break; 656 657 case BSTP_PDU_INFERIOR: 658 if (cu->cu_learning) { 659 bp->bp_agreed = 1; 660 bp->bp_proposing = 0; 661 } 662 break; 663 664 case BSTP_PDU_INFERIORALT: 665 /* 666 * only point to point links are allowed fast 667 * transitions to forwarding. 668 */ 669 if (cu->cu_agree && bp->bp_ptp_link) { 670 bp->bp_agreed = 1; 671 bp->bp_proposing = 0; 672 } else 673 bp->bp_agreed = 0; 674 675 if (cu->cu_topology_change) 676 bp->bp_rcvdtc = 1; 677 if (cu->cu_topology_change_ack) 678 bp->bp_rcvdtca = 1; 679 break; 680 681 case BSTP_PDU_OTHER: 682 return; /* do nothing */ 683 } 684 /* update the state machines with the new data */ 685 bstp_update_state(bs, bp); 686 } 687 688 static int 689 bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu) 690 { 691 int type; 692 693 /* default return type */ 694 type = BSTP_PDU_OTHER; 695 696 switch (cu->cu_role) { 697 case BSTP_ROLE_DESIGNATED: 698 if (bstp_info_superior(&bp->bp_port_pv, &cu->cu_pv)) 699 /* bpdu priority is superior */ 700 type = BSTP_PDU_SUPERIOR; 701 else if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) == 702 INFO_SAME) { 703 if (bp->bp_port_msg_age != cu->cu_message_age || 704 bp->bp_port_max_age != cu->cu_max_age || 705 bp->bp_port_fdelay != cu->cu_forward_delay || 706 bp->bp_port_htime != cu->cu_hello_time) 707 /* bpdu priority is equal and timers differ */ 708 type = BSTP_PDU_SUPERIOR; 709 else 710 /* bpdu is equal */ 711 type = BSTP_PDU_REPEATED; 712 } else 713 /* bpdu priority is worse */ 714 type = BSTP_PDU_INFERIOR; 715 716 break; 717 718 case BSTP_ROLE_ROOT: 719 case BSTP_ROLE_ALTERNATE: 720 case BSTP_ROLE_BACKUP: 721 if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) <= INFO_SAME) 722 /* 723 * not a designated port and priority is the same or 724 * worse 725 */ 726 type = BSTP_PDU_INFERIORALT; 727 break; 728 } 729 730 return (type); 731 } 732 733 static int 734 bstp_pdu_bettersame(struct bstp_port *bp, int newinfo) 735 { 736 if (newinfo == BSTP_INFO_RECEIVED && 737 bp->bp_infois == BSTP_INFO_RECEIVED && 738 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME) 739 return (1); 740 741 if (newinfo == BSTP_INFO_MINE && 742 bp->bp_infois == BSTP_INFO_MINE && 743 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) >= INFO_SAME) 744 return (1); 745 746 return (0); 747 } 748 749 static int 750 bstp_info_cmp(struct bstp_pri_vector *pv, 751 struct bstp_pri_vector *cpv) 752 { 753 if (cpv->pv_root_id < pv->pv_root_id) 754 return (INFO_BETTER); 755 if (cpv->pv_root_id > pv->pv_root_id) 756 return (INFO_WORSE); 757 758 if (cpv->pv_cost < pv->pv_cost) 759 return (INFO_BETTER); 760 if (cpv->pv_cost > pv->pv_cost) 761 return (INFO_WORSE); 762 763 if (cpv->pv_dbridge_id < pv->pv_dbridge_id) 764 return (INFO_BETTER); 765 if (cpv->pv_dbridge_id > pv->pv_dbridge_id) 766 return (INFO_WORSE); 767 768 if (cpv->pv_dport_id < pv->pv_dport_id) 769 return (INFO_BETTER); 770 if (cpv->pv_dport_id > pv->pv_dport_id) 771 return (INFO_WORSE); 772 773 return (INFO_SAME); 774 } 775 776 /* 777 * This message priority vector is superior to the port priority vector and 778 * will replace it if, and only if, the message priority vector is better than 779 * the port priority vector, or the message has been transmitted from the same 780 * designated bridge and designated port as the port priority vector. 781 */ 782 static int 783 bstp_info_superior(struct bstp_pri_vector *pv, 784 struct bstp_pri_vector *cpv) 785 { 786 if (bstp_info_cmp(pv, cpv) == INFO_BETTER || 787 (bstp_same_bridgeid(pv->pv_dbridge_id, cpv->pv_dbridge_id) && 788 (cpv->pv_dport_id & 0xfff) == (pv->pv_dport_id & 0xfff))) 789 return (1); 790 return (0); 791 } 792 793 static void 794 bstp_assign_roles(struct bstp_state *bs) 795 { 796 struct bstp_port *bp, *rbp = NULL; 797 struct bstp_pri_vector pv; 798 799 /* default to our priority vector */ 800 bs->bs_root_pv = bs->bs_bridge_pv; 801 bs->bs_root_msg_age = 0; 802 bs->bs_root_max_age = bs->bs_bridge_max_age; 803 bs->bs_root_fdelay = bs->bs_bridge_fdelay; 804 bs->bs_root_htime = bs->bs_bridge_htime; 805 bs->bs_root_port = NULL; 806 807 /* check if any recieved info supersedes us */ 808 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 809 if (bp->bp_infois != BSTP_INFO_RECEIVED) 810 continue; 811 812 pv = bp->bp_port_pv; 813 pv.pv_cost += bp->bp_path_cost; 814 815 /* 816 * The root priority vector is the best of the set comprising 817 * the bridge priority vector plus all root path priority 818 * vectors whose bridge address is not equal to us. 819 */ 820 if (bstp_same_bridgeid(pv.pv_dbridge_id, 821 bs->bs_bridge_pv.pv_dbridge_id) == 0 && 822 bstp_info_cmp(&bs->bs_root_pv, &pv) == INFO_BETTER) { 823 /* the port vector replaces the root */ 824 bs->bs_root_pv = pv; 825 bs->bs_root_msg_age = bp->bp_port_msg_age + 826 BSTP_MESSAGE_AGE_INCR; 827 bs->bs_root_max_age = bp->bp_port_max_age; 828 bs->bs_root_fdelay = bp->bp_port_fdelay; 829 bs->bs_root_htime = bp->bp_port_htime; 830 rbp = bp; 831 } 832 } 833 834 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 835 /* calculate the port designated vector */ 836 bp->bp_desg_pv.pv_root_id = bs->bs_root_pv.pv_root_id; 837 bp->bp_desg_pv.pv_cost = bs->bs_root_pv.pv_cost; 838 bp->bp_desg_pv.pv_dbridge_id = bs->bs_bridge_pv.pv_dbridge_id; 839 bp->bp_desg_pv.pv_dport_id = bp->bp_port_id; 840 bp->bp_desg_pv.pv_port_id = bp->bp_port_id; 841 842 /* calculate designated times */ 843 bp->bp_desg_msg_age = bs->bs_root_msg_age; 844 bp->bp_desg_max_age = bs->bs_root_max_age; 845 bp->bp_desg_fdelay = bs->bs_root_fdelay; 846 bp->bp_desg_htime = bs->bs_bridge_htime; 847 848 849 switch (bp->bp_infois) { 850 case BSTP_INFO_DISABLED: 851 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 852 break; 853 854 case BSTP_INFO_AGED: 855 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 856 bstp_update_info(bp); 857 break; 858 859 case BSTP_INFO_MINE: 860 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 861 /* update the port info if stale */ 862 if (bstp_info_cmp(&bp->bp_port_pv, 863 &bp->bp_desg_pv) != INFO_SAME || 864 (rbp != NULL && 865 (bp->bp_port_msg_age != rbp->bp_port_msg_age || 866 bp->bp_port_max_age != rbp->bp_port_max_age || 867 bp->bp_port_fdelay != rbp->bp_port_fdelay || 868 bp->bp_port_htime != rbp->bp_port_htime))) 869 bstp_update_info(bp); 870 break; 871 872 case BSTP_INFO_RECEIVED: 873 if (bp == rbp) { 874 /* 875 * root priority is derived from this 876 * port, make it the root port. 877 */ 878 bstp_set_port_role(bp, BSTP_ROLE_ROOT); 879 bs->bs_root_port = bp; 880 } else if (bstp_info_cmp(&bp->bp_port_pv, 881 &bp->bp_desg_pv) == INFO_BETTER) { 882 /* 883 * the port priority is lower than the root 884 * port. 885 */ 886 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 887 bstp_update_info(bp); 888 } else { 889 if (bstp_same_bridgeid( 890 bp->bp_port_pv.pv_dbridge_id, 891 bs->bs_bridge_pv.pv_dbridge_id)) { 892 /* 893 * the designated bridge refers to 894 * another port on this bridge. 895 */ 896 bstp_set_port_role(bp, 897 BSTP_ROLE_BACKUP); 898 } else { 899 /* 900 * the port is an inferior path to the 901 * root bridge. 902 */ 903 bstp_set_port_role(bp, 904 BSTP_ROLE_ALTERNATE); 905 } 906 } 907 break; 908 } 909 } 910 } 911 912 static void 913 bstp_update_state(struct bstp_state *bs, struct bstp_port *bp) 914 { 915 struct bstp_port *bp2; 916 int synced; 917 918 BSTP_LOCK_ASSERT(bs); 919 920 /* check if all the ports have syncronised again */ 921 if (!bs->bs_allsynced) { 922 synced = 1; 923 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 924 if (!(bp2->bp_synced || 925 bp2->bp_role == BSTP_ROLE_ROOT)) { 926 synced = 0; 927 break; 928 } 929 } 930 bs->bs_allsynced = synced; 931 } 932 933 bstp_update_roles(bs, bp); 934 bstp_update_tc(bp); 935 } 936 937 static void 938 bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp) 939 { 940 switch (bp->bp_role) { 941 case BSTP_ROLE_DISABLED: 942 /* Clear any flags if set */ 943 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 944 bp->bp_sync = 0; 945 bp->bp_synced = 1; 946 bp->bp_reroot = 0; 947 } 948 break; 949 950 case BSTP_ROLE_ALTERNATE: 951 case BSTP_ROLE_BACKUP: 952 if ((bs->bs_allsynced && !bp->bp_agree) || 953 (bp->bp_proposed && bp->bp_agree)) { 954 bp->bp_proposed = 0; 955 bp->bp_agree = 1; 956 bp->bp_flags |= BSTP_PORT_NEWINFO; 957 DPRINTF("%s -> ALTERNATE_AGREED\n", 958 bp->bp_ifp->if_xname); 959 } 960 961 if (bp->bp_proposed && !bp->bp_agree) { 962 bstp_set_all_sync(bs); 963 bp->bp_proposed = 0; 964 DPRINTF("%s -> ALTERNATE_PROPOSED\n", 965 bp->bp_ifp->if_xname); 966 } 967 968 /* Clear any flags if set */ 969 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 970 bp->bp_sync = 0; 971 bp->bp_synced = 1; 972 bp->bp_reroot = 0; 973 DPRINTF("%s -> ALTERNATE_PORT\n", bp->bp_ifp->if_xname); 974 } 975 break; 976 977 case BSTP_ROLE_ROOT: 978 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) { 979 bstp_set_all_reroot(bs); 980 DPRINTF("%s -> ROOT_REROOT\n", bp->bp_ifp->if_xname); 981 } 982 983 if ((bs->bs_allsynced && !bp->bp_agree) || 984 (bp->bp_proposed && bp->bp_agree)) { 985 bp->bp_proposed = 0; 986 bp->bp_sync = 0; 987 bp->bp_agree = 1; 988 bp->bp_flags |= BSTP_PORT_NEWINFO; 989 DPRINTF("%s -> ROOT_AGREED\n", bp->bp_ifp->if_xname); 990 } 991 992 if (bp->bp_proposed && !bp->bp_agree) { 993 bstp_set_all_sync(bs); 994 bp->bp_proposed = 0; 995 DPRINTF("%s -> ROOT_PROPOSED\n", bp->bp_ifp->if_xname); 996 } 997 998 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 999 (bp->bp_forward_delay_timer.active == 0 || 1000 (bstp_rerooted(bs, bp) && 1001 bp->bp_recent_backup_timer.active == 0 && 1002 bp->bp_protover == BSTP_PROTO_RSTP))) { 1003 switch (bp->bp_state) { 1004 case BSTP_IFSTATE_DISCARDING: 1005 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 1006 break; 1007 case BSTP_IFSTATE_LEARNING: 1008 bstp_set_port_state(bp, 1009 BSTP_IFSTATE_FORWARDING); 1010 break; 1011 } 1012 } 1013 1014 if (bp->bp_state == BSTP_IFSTATE_FORWARDING && bp->bp_reroot) { 1015 bp->bp_reroot = 0; 1016 DPRINTF("%s -> ROOT_REROOTED\n", bp->bp_ifp->if_xname); 1017 } 1018 break; 1019 1020 case BSTP_ROLE_DESIGNATED: 1021 if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) { 1022 bp->bp_reroot = 0; 1023 DPRINTF("%s -> DESIGNATED_RETIRED\n", 1024 bp->bp_ifp->if_xname); 1025 } 1026 1027 if ((bp->bp_state == BSTP_IFSTATE_DISCARDING && 1028 !bp->bp_synced) || (bp->bp_agreed && !bp->bp_synced) || 1029 (bp->bp_operedge && !bp->bp_synced) || 1030 (bp->bp_sync && bp->bp_synced)) { 1031 bstp_timer_stop(&bp->bp_recent_root_timer); 1032 bp->bp_synced = 1; 1033 bp->bp_sync = 0; 1034 DPRINTF("%s -> DESIGNATED_SYNCED\n", 1035 bp->bp_ifp->if_xname); 1036 } 1037 1038 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1039 !bp->bp_agreed && !bp->bp_proposing && 1040 !bp->bp_operedge) { 1041 bp->bp_proposing = 1; 1042 bp->bp_flags |= BSTP_PORT_NEWINFO; 1043 bstp_timer_start(&bp->bp_edge_delay_timer, 1044 (bp->bp_ptp_link ? BSTP_DEFAULT_MIGRATE_DELAY : 1045 bp->bp_desg_max_age)); 1046 DPRINTF("%s -> DESIGNATED_PROPOSE\n", 1047 bp->bp_ifp->if_xname); 1048 } 1049 1050 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1051 (bp->bp_forward_delay_timer.active == 0 || bp->bp_agreed || 1052 bp->bp_operedge) && 1053 (bp->bp_recent_root_timer.active == 0 || !bp->bp_reroot) && 1054 !bp->bp_sync) { 1055 if (bp->bp_agreed) 1056 DPRINTF("%s -> AGREED\n", bp->bp_ifp->if_xname); 1057 /* 1058 * If agreed|operedge then go straight to forwarding, 1059 * otherwise follow discard -> learn -> forward. 1060 */ 1061 if (bp->bp_agreed || bp->bp_operedge || 1062 bp->bp_state == BSTP_IFSTATE_LEARNING) { 1063 bstp_set_port_state(bp, 1064 BSTP_IFSTATE_FORWARDING); 1065 bp->bp_agreed = bp->bp_protover; 1066 } else if (bp->bp_state == BSTP_IFSTATE_DISCARDING) 1067 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 1068 } 1069 1070 if (((bp->bp_sync && !bp->bp_synced) || 1071 (bp->bp_reroot && bp->bp_recent_root_timer.active) || 1072 (bp->bp_flags & BSTP_PORT_DISPUTED)) && !bp->bp_operedge && 1073 bp->bp_state != BSTP_IFSTATE_DISCARDING) { 1074 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1075 bp->bp_flags &= ~BSTP_PORT_DISPUTED; 1076 bstp_timer_start(&bp->bp_forward_delay_timer, 1077 bp->bp_protover == BSTP_PROTO_RSTP ? 1078 bp->bp_desg_htime : bp->bp_desg_fdelay); 1079 DPRINTF("%s -> DESIGNATED_DISCARD\n", 1080 bp->bp_ifp->if_xname); 1081 } 1082 break; 1083 } 1084 1085 if (bp->bp_flags & BSTP_PORT_NEWINFO) 1086 bstp_transmit(bs, bp); 1087 } 1088 1089 static void 1090 bstp_update_tc(struct bstp_port *bp) 1091 { 1092 switch (bp->bp_tcstate) { 1093 case BSTP_TCSTATE_ACTIVE: 1094 if ((bp->bp_role != BSTP_ROLE_DESIGNATED && 1095 bp->bp_role != BSTP_ROLE_ROOT) || bp->bp_operedge) 1096 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1097 1098 if (bp->bp_rcvdtcn) 1099 bstp_set_port_tc(bp, BSTP_TCSTATE_TCN); 1100 if (bp->bp_rcvdtc) 1101 bstp_set_port_tc(bp, BSTP_TCSTATE_TC); 1102 1103 if (bp->bp_tc_prop && !bp->bp_operedge) 1104 bstp_set_port_tc(bp, BSTP_TCSTATE_PROPAG); 1105 1106 if (bp->bp_rcvdtca) 1107 bstp_set_port_tc(bp, BSTP_TCSTATE_ACK); 1108 break; 1109 1110 case BSTP_TCSTATE_INACTIVE: 1111 if ((bp->bp_state == BSTP_IFSTATE_LEARNING || 1112 bp->bp_state == BSTP_IFSTATE_FORWARDING) && 1113 bp->bp_fdbflush == 0) 1114 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1115 break; 1116 1117 case BSTP_TCSTATE_LEARNING: 1118 if (bp->bp_rcvdtc || bp->bp_rcvdtcn || bp->bp_rcvdtca || 1119 bp->bp_tc_prop) 1120 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1121 else if (bp->bp_role != BSTP_ROLE_DESIGNATED && 1122 bp->bp_role != BSTP_ROLE_ROOT && 1123 bp->bp_state == BSTP_IFSTATE_DISCARDING) 1124 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1125 1126 if ((bp->bp_role == BSTP_ROLE_DESIGNATED || 1127 bp->bp_role == BSTP_ROLE_ROOT) && 1128 bp->bp_state == BSTP_IFSTATE_FORWARDING && 1129 !bp->bp_operedge) 1130 bstp_set_port_tc(bp, BSTP_TCSTATE_DETECTED); 1131 break; 1132 1133 /* these are transient states and go straight back to ACTIVE */ 1134 case BSTP_TCSTATE_DETECTED: 1135 case BSTP_TCSTATE_TCN: 1136 case BSTP_TCSTATE_TC: 1137 case BSTP_TCSTATE_PROPAG: 1138 case BSTP_TCSTATE_ACK: 1139 DPRINTF("Invalid TC state for %s\n", 1140 bp->bp_ifp->if_xname); 1141 break; 1142 } 1143 1144 } 1145 1146 static void 1147 bstp_update_info(struct bstp_port *bp) 1148 { 1149 struct bstp_state *bs = bp->bp_bs; 1150 1151 bp->bp_proposing = 0; 1152 bp->bp_proposed = 0; 1153 1154 if (bp->bp_agreed && !bstp_pdu_bettersame(bp, BSTP_INFO_MINE)) 1155 bp->bp_agreed = 0; 1156 1157 if (bp->bp_synced && !bp->bp_agreed) { 1158 bp->bp_synced = 0; 1159 bs->bs_allsynced = 0; 1160 } 1161 1162 /* copy the designated pv to the port */ 1163 bp->bp_port_pv = bp->bp_desg_pv; 1164 bp->bp_port_msg_age = bp->bp_desg_msg_age; 1165 bp->bp_port_max_age = bp->bp_desg_max_age; 1166 bp->bp_port_fdelay = bp->bp_desg_fdelay; 1167 bp->bp_port_htime = bp->bp_desg_htime; 1168 bp->bp_infois = BSTP_INFO_MINE; 1169 1170 /* Set transmit flag but do not immediately send */ 1171 bp->bp_flags |= BSTP_PORT_NEWINFO; 1172 } 1173 1174 /* set tcprop on every port other than the caller */ 1175 static void 1176 bstp_set_other_tcprop(struct bstp_port *bp) 1177 { 1178 struct bstp_state *bs = bp->bp_bs; 1179 struct bstp_port *bp2; 1180 1181 BSTP_LOCK_ASSERT(bs); 1182 1183 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1184 if (bp2 == bp) 1185 continue; 1186 bp2->bp_tc_prop = 1; 1187 } 1188 } 1189 1190 static void 1191 bstp_set_all_reroot(struct bstp_state *bs) 1192 { 1193 struct bstp_port *bp; 1194 1195 BSTP_LOCK_ASSERT(bs); 1196 1197 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1198 bp->bp_reroot = 1; 1199 } 1200 1201 static void 1202 bstp_set_all_sync(struct bstp_state *bs) 1203 { 1204 struct bstp_port *bp; 1205 1206 BSTP_LOCK_ASSERT(bs); 1207 1208 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1209 bp->bp_sync = 1; 1210 bp->bp_synced = 0; /* Not explicit in spec */ 1211 } 1212 1213 bs->bs_allsynced = 0; 1214 } 1215 1216 static void 1217 bstp_set_port_state(struct bstp_port *bp, int state) 1218 { 1219 if (bp->bp_state == state) 1220 return; 1221 1222 bp->bp_state = state; 1223 1224 switch (bp->bp_state) { 1225 case BSTP_IFSTATE_DISCARDING: 1226 DPRINTF("state changed to DISCARDING on %s\n", 1227 bp->bp_ifp->if_xname); 1228 break; 1229 1230 case BSTP_IFSTATE_LEARNING: 1231 DPRINTF("state changed to LEARNING on %s\n", 1232 bp->bp_ifp->if_xname); 1233 1234 bstp_timer_start(&bp->bp_forward_delay_timer, 1235 bp->bp_protover == BSTP_PROTO_RSTP ? 1236 bp->bp_desg_htime : bp->bp_desg_fdelay); 1237 break; 1238 1239 case BSTP_IFSTATE_FORWARDING: 1240 DPRINTF("state changed to FORWARDING on %s\n", 1241 bp->bp_ifp->if_xname); 1242 1243 bstp_timer_stop(&bp->bp_forward_delay_timer); 1244 /* Record that we enabled forwarding */ 1245 bp->bp_forward_transitions++; 1246 break; 1247 } 1248 1249 /* notify the parent bridge */ 1250 taskqueue_enqueue(taskqueue_swi, &bp->bp_statetask); 1251 } 1252 1253 static void 1254 bstp_set_port_role(struct bstp_port *bp, int role) 1255 { 1256 struct bstp_state *bs = bp->bp_bs; 1257 1258 if (bp->bp_role == role) 1259 return; 1260 1261 /* perform pre-change tasks */ 1262 switch (bp->bp_role) { 1263 case BSTP_ROLE_DISABLED: 1264 bstp_timer_start(&bp->bp_forward_delay_timer, 1265 bp->bp_desg_max_age); 1266 break; 1267 1268 case BSTP_ROLE_BACKUP: 1269 bstp_timer_start(&bp->bp_recent_backup_timer, 1270 bp->bp_desg_htime * 2); 1271 /* fall through */ 1272 case BSTP_ROLE_ALTERNATE: 1273 bstp_timer_start(&bp->bp_forward_delay_timer, 1274 bp->bp_desg_fdelay); 1275 bp->bp_sync = 0; 1276 bp->bp_synced = 1; 1277 bp->bp_reroot = 0; 1278 break; 1279 1280 case BSTP_ROLE_ROOT: 1281 bstp_timer_start(&bp->bp_recent_root_timer, 1282 BSTP_DEFAULT_FORWARD_DELAY); 1283 break; 1284 } 1285 1286 bp->bp_role = role; 1287 /* clear values not carried between roles */ 1288 bp->bp_proposing = 0; 1289 bs->bs_allsynced = 0; 1290 1291 /* initialise the new role */ 1292 switch (bp->bp_role) { 1293 case BSTP_ROLE_DISABLED: 1294 case BSTP_ROLE_ALTERNATE: 1295 case BSTP_ROLE_BACKUP: 1296 DPRINTF("%s role -> ALT/BACK/DISABLED\n", 1297 bp->bp_ifp->if_xname); 1298 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1299 bstp_timer_stop(&bp->bp_recent_root_timer); 1300 bstp_timer_latch(&bp->bp_forward_delay_timer); 1301 bp->bp_sync = 0; 1302 bp->bp_synced = 1; 1303 bp->bp_reroot = 0; 1304 break; 1305 1306 case BSTP_ROLE_ROOT: 1307 DPRINTF("%s role -> ROOT\n", 1308 bp->bp_ifp->if_xname); 1309 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1310 bstp_timer_latch(&bp->bp_recent_root_timer); 1311 bp->bp_proposing = 0; 1312 break; 1313 1314 case BSTP_ROLE_DESIGNATED: 1315 DPRINTF("%s role -> DESIGNATED\n", 1316 bp->bp_ifp->if_xname); 1317 bstp_timer_start(&bp->bp_hello_timer, 1318 bp->bp_desg_htime); 1319 bp->bp_agree = 0; 1320 break; 1321 } 1322 1323 /* let the TC state know that the role changed */ 1324 bstp_update_tc(bp); 1325 } 1326 1327 static void 1328 bstp_set_port_proto(struct bstp_port *bp, int proto) 1329 { 1330 struct bstp_state *bs = bp->bp_bs; 1331 1332 /* supported protocol versions */ 1333 switch (proto) { 1334 case BSTP_PROTO_STP: 1335 /* we can downgrade protocols only */ 1336 bstp_timer_stop(&bp->bp_migrate_delay_timer); 1337 /* clear unsupported features */ 1338 bp->bp_operedge = 0; 1339 /* STP compat mode only uses 16 bits of the 32 */ 1340 if (bp->bp_path_cost > 65535) 1341 bp->bp_path_cost = 65535; 1342 break; 1343 1344 case BSTP_PROTO_RSTP: 1345 bstp_timer_start(&bp->bp_migrate_delay_timer, 1346 bs->bs_migration_delay); 1347 break; 1348 1349 default: 1350 DPRINTF("Unsupported STP version %d\n", proto); 1351 return; 1352 } 1353 1354 bp->bp_protover = proto; 1355 bp->bp_flags &= ~BSTP_PORT_CANMIGRATE; 1356 } 1357 1358 static void 1359 bstp_set_port_tc(struct bstp_port *bp, int state) 1360 { 1361 struct bstp_state *bs = bp->bp_bs; 1362 1363 bp->bp_tcstate = state; 1364 1365 /* initialise the new state */ 1366 switch (bp->bp_tcstate) { 1367 case BSTP_TCSTATE_ACTIVE: 1368 DPRINTF("%s -> TC_ACTIVE\n", bp->bp_ifp->if_xname); 1369 /* nothing to do */ 1370 break; 1371 1372 case BSTP_TCSTATE_INACTIVE: 1373 bstp_timer_stop(&bp->bp_tc_timer); 1374 /* flush routes on the parent bridge */ 1375 bp->bp_fdbflush = 1; 1376 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask); 1377 bp->bp_tc_ack = 0; 1378 DPRINTF("%s -> TC_INACTIVE\n", bp->bp_ifp->if_xname); 1379 break; 1380 1381 case BSTP_TCSTATE_LEARNING: 1382 bp->bp_rcvdtc = 0; 1383 bp->bp_rcvdtcn = 0; 1384 bp->bp_rcvdtca = 0; 1385 bp->bp_tc_prop = 0; 1386 DPRINTF("%s -> TC_LEARNING\n", bp->bp_ifp->if_xname); 1387 break; 1388 1389 case BSTP_TCSTATE_DETECTED: 1390 bstp_set_timer_tc(bp); 1391 bstp_set_other_tcprop(bp); 1392 /* send out notification */ 1393 bp->bp_flags |= BSTP_PORT_NEWINFO; 1394 bstp_transmit(bs, bp); 1395 getmicrotime(&bs->bs_last_tc_time); 1396 DPRINTF("%s -> TC_DETECTED\n", bp->bp_ifp->if_xname); 1397 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1398 break; 1399 1400 case BSTP_TCSTATE_TCN: 1401 bstp_set_timer_tc(bp); 1402 DPRINTF("%s -> TC_TCN\n", bp->bp_ifp->if_xname); 1403 /* fall through */ 1404 case BSTP_TCSTATE_TC: 1405 bp->bp_rcvdtc = 0; 1406 bp->bp_rcvdtcn = 0; 1407 if (bp->bp_role == BSTP_ROLE_DESIGNATED) 1408 bp->bp_tc_ack = 1; 1409 1410 bstp_set_other_tcprop(bp); 1411 DPRINTF("%s -> TC_TC\n", bp->bp_ifp->if_xname); 1412 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1413 break; 1414 1415 case BSTP_TCSTATE_PROPAG: 1416 /* flush routes on the parent bridge */ 1417 bp->bp_fdbflush = 1; 1418 taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask); 1419 bp->bp_tc_prop = 0; 1420 bstp_set_timer_tc(bp); 1421 DPRINTF("%s -> TC_PROPAG\n", bp->bp_ifp->if_xname); 1422 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1423 break; 1424 1425 case BSTP_TCSTATE_ACK: 1426 bstp_timer_stop(&bp->bp_tc_timer); 1427 bp->bp_rcvdtca = 0; 1428 DPRINTF("%s -> TC_ACK\n", bp->bp_ifp->if_xname); 1429 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1430 break; 1431 } 1432 } 1433 1434 static void 1435 bstp_set_timer_tc(struct bstp_port *bp) 1436 { 1437 struct bstp_state *bs = bp->bp_bs; 1438 1439 if (bp->bp_tc_timer.active) 1440 return; 1441 1442 switch (bp->bp_protover) { 1443 case BSTP_PROTO_RSTP: 1444 bstp_timer_start(&bp->bp_tc_timer, 1445 bp->bp_desg_htime + BSTP_TICK_VAL); 1446 bp->bp_flags |= BSTP_PORT_NEWINFO; 1447 break; 1448 1449 case BSTP_PROTO_STP: 1450 bstp_timer_start(&bp->bp_tc_timer, 1451 bs->bs_root_max_age + bs->bs_root_fdelay); 1452 break; 1453 } 1454 } 1455 1456 static void 1457 bstp_set_timer_msgage(struct bstp_port *bp) 1458 { 1459 if (bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR <= 1460 bp->bp_port_max_age) { 1461 bstp_timer_start(&bp->bp_message_age_timer, 1462 bp->bp_port_htime * 3); 1463 } else 1464 /* expires immediately */ 1465 bstp_timer_start(&bp->bp_message_age_timer, 0); 1466 } 1467 1468 static int 1469 bstp_rerooted(struct bstp_state *bs, struct bstp_port *bp) 1470 { 1471 struct bstp_port *bp2; 1472 int rr_set = 0; 1473 1474 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1475 if (bp2 == bp) 1476 continue; 1477 if (bp2->bp_recent_root_timer.active) { 1478 rr_set = 1; 1479 break; 1480 } 1481 } 1482 return (!rr_set); 1483 } 1484 1485 int 1486 bstp_set_htime(struct bstp_state *bs, int t) 1487 { 1488 /* convert seconds to ticks */ 1489 t *= BSTP_TICK_VAL; 1490 1491 /* value can only be changed in leagacy stp mode */ 1492 if (bs->bs_protover != BSTP_PROTO_STP) 1493 return (EPERM); 1494 1495 if (t < BSTP_MIN_HELLO_TIME || t > BSTP_MAX_HELLO_TIME) 1496 return (EINVAL); 1497 1498 BSTP_LOCK(bs); 1499 bs->bs_bridge_htime = t; 1500 bstp_reinit(bs); 1501 BSTP_UNLOCK(bs); 1502 return (0); 1503 } 1504 1505 int 1506 bstp_set_fdelay(struct bstp_state *bs, int t) 1507 { 1508 /* convert seconds to ticks */ 1509 t *= BSTP_TICK_VAL; 1510 1511 if (t < BSTP_MIN_FORWARD_DELAY || t > BSTP_MAX_FORWARD_DELAY) 1512 return (EINVAL); 1513 1514 BSTP_LOCK(bs); 1515 bs->bs_bridge_fdelay = t; 1516 bstp_reinit(bs); 1517 BSTP_UNLOCK(bs); 1518 return (0); 1519 } 1520 1521 int 1522 bstp_set_maxage(struct bstp_state *bs, int t) 1523 { 1524 /* convert seconds to ticks */ 1525 t *= BSTP_TICK_VAL; 1526 1527 if (t < BSTP_MIN_MAX_AGE || t > BSTP_MAX_MAX_AGE) 1528 return (EINVAL); 1529 1530 BSTP_LOCK(bs); 1531 bs->bs_bridge_max_age = t; 1532 bstp_reinit(bs); 1533 BSTP_UNLOCK(bs); 1534 return (0); 1535 } 1536 1537 int 1538 bstp_set_holdcount(struct bstp_state *bs, int count) 1539 { 1540 struct bstp_port *bp; 1541 1542 if (count < BSTP_MIN_HOLD_COUNT || 1543 count > BSTP_MAX_HOLD_COUNT) 1544 return (EINVAL); 1545 1546 BSTP_LOCK(bs); 1547 bs->bs_txholdcount = count; 1548 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1549 bp->bp_txcount = 0; 1550 BSTP_UNLOCK(bs); 1551 return (0); 1552 } 1553 1554 int 1555 bstp_set_protocol(struct bstp_state *bs, int proto) 1556 { 1557 struct bstp_port *bp; 1558 1559 switch (proto) { 1560 /* Supported protocol versions */ 1561 case BSTP_PROTO_STP: 1562 case BSTP_PROTO_RSTP: 1563 break; 1564 1565 default: 1566 return (EINVAL); 1567 } 1568 1569 BSTP_LOCK(bs); 1570 bs->bs_protover = proto; 1571 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 1572 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1573 /* reinit state */ 1574 bp->bp_infois = BSTP_INFO_DISABLED; 1575 bp->bp_txcount = 0; 1576 bstp_set_port_proto(bp, bs->bs_protover); 1577 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 1578 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1579 bstp_timer_stop(&bp->bp_recent_backup_timer); 1580 } 1581 bstp_reinit(bs); 1582 BSTP_UNLOCK(bs); 1583 return (0); 1584 } 1585 1586 int 1587 bstp_set_priority(struct bstp_state *bs, int pri) 1588 { 1589 if (pri < 0 || pri > BSTP_MAX_PRIORITY) 1590 return (EINVAL); 1591 1592 /* Limit to steps of 4096 */ 1593 pri -= pri % 4096; 1594 1595 BSTP_LOCK(bs); 1596 bs->bs_bridge_priority = pri; 1597 bstp_reinit(bs); 1598 BSTP_UNLOCK(bs); 1599 return (0); 1600 } 1601 1602 int 1603 bstp_set_port_priority(struct bstp_port *bp, int pri) 1604 { 1605 struct bstp_state *bs = bp->bp_bs; 1606 1607 if (pri < 0 || pri > BSTP_MAX_PORT_PRIORITY) 1608 return (EINVAL); 1609 1610 /* Limit to steps of 16 */ 1611 pri -= pri % 16; 1612 1613 BSTP_LOCK(bs); 1614 bp->bp_priority = pri; 1615 bstp_reinit(bs); 1616 BSTP_UNLOCK(bs); 1617 return (0); 1618 } 1619 1620 int 1621 bstp_set_path_cost(struct bstp_port *bp, uint32_t path_cost) 1622 { 1623 struct bstp_state *bs = bp->bp_bs; 1624 1625 if (path_cost > BSTP_MAX_PATH_COST) 1626 return (EINVAL); 1627 1628 /* STP compat mode only uses 16 bits of the 32 */ 1629 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1630 path_cost = 65535; 1631 1632 BSTP_LOCK(bs); 1633 1634 if (path_cost == 0) { /* use auto */ 1635 bp->bp_flags &= ~BSTP_PORT_ADMCOST; 1636 bp->bp_path_cost = bstp_calc_path_cost(bp); 1637 } else { 1638 bp->bp_path_cost = path_cost; 1639 bp->bp_flags |= BSTP_PORT_ADMCOST; 1640 } 1641 bstp_reinit(bs); 1642 BSTP_UNLOCK(bs); 1643 return (0); 1644 } 1645 1646 int 1647 bstp_set_edge(struct bstp_port *bp, int set) 1648 { 1649 struct bstp_state *bs = bp->bp_bs; 1650 1651 BSTP_LOCK(bs); 1652 if ((bp->bp_operedge = set) == 0) 1653 bp->bp_flags &= ~BSTP_PORT_ADMEDGE; 1654 else 1655 bp->bp_flags |= BSTP_PORT_ADMEDGE; 1656 BSTP_UNLOCK(bs); 1657 return (0); 1658 } 1659 1660 int 1661 bstp_set_autoedge(struct bstp_port *bp, int set) 1662 { 1663 struct bstp_state *bs = bp->bp_bs; 1664 1665 BSTP_LOCK(bs); 1666 if (set) { 1667 bp->bp_flags |= BSTP_PORT_AUTOEDGE; 1668 /* we may be able to transition straight to edge */ 1669 if (bp->bp_edge_delay_timer.active == 0) 1670 bstp_edge_delay_expiry(bs, bp); 1671 } else 1672 bp->bp_flags &= ~BSTP_PORT_AUTOEDGE; 1673 BSTP_UNLOCK(bs); 1674 return (0); 1675 } 1676 1677 int 1678 bstp_set_ptp(struct bstp_port *bp, int set) 1679 { 1680 struct bstp_state *bs = bp->bp_bs; 1681 1682 BSTP_LOCK(bs); 1683 bp->bp_ptp_link = set; 1684 BSTP_UNLOCK(bs); 1685 return (0); 1686 } 1687 1688 int 1689 bstp_set_autoptp(struct bstp_port *bp, int set) 1690 { 1691 struct bstp_state *bs = bp->bp_bs; 1692 1693 BSTP_LOCK(bs); 1694 if (set) { 1695 bp->bp_flags |= BSTP_PORT_AUTOPTP; 1696 if (bp->bp_role != BSTP_ROLE_DISABLED) 1697 bstp_ifupdstatus(bs, bp); 1698 } else 1699 bp->bp_flags &= ~BSTP_PORT_AUTOPTP; 1700 BSTP_UNLOCK(bs); 1701 return (0); 1702 } 1703 1704 /* 1705 * Calculate the path cost according to the link speed. 1706 */ 1707 static uint32_t 1708 bstp_calc_path_cost(struct bstp_port *bp) 1709 { 1710 struct ifnet *ifp = bp->bp_ifp; 1711 uint32_t path_cost; 1712 1713 /* If the priority has been manually set then retain the value */ 1714 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1715 return bp->bp_path_cost; 1716 1717 if (ifp->if_link_state == LINK_STATE_DOWN) { 1718 /* Recalc when the link comes up again */ 1719 bp->bp_flags |= BSTP_PORT_PNDCOST; 1720 return (BSTP_DEFAULT_PATH_COST); 1721 } 1722 1723 if (ifp->if_baudrate < 1000) 1724 return (BSTP_DEFAULT_PATH_COST); 1725 1726 /* formula from section 17.14, IEEE Std 802.1D-2004 */ 1727 path_cost = 20000000000ULL / (ifp->if_baudrate / 1000); 1728 1729 if (path_cost > BSTP_MAX_PATH_COST) 1730 path_cost = BSTP_MAX_PATH_COST; 1731 1732 /* STP compat mode only uses 16 bits of the 32 */ 1733 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1734 path_cost = 65535; 1735 1736 return (path_cost); 1737 } 1738 1739 /* 1740 * Notify the bridge that a port state has changed, we need to do this from a 1741 * taskqueue to avoid a LOR. 1742 */ 1743 static void 1744 bstp_notify_state(void *arg, int pending) 1745 { 1746 struct bstp_port *bp = (struct bstp_port *)arg; 1747 struct bstp_state *bs = bp->bp_bs; 1748 1749 if (bp->bp_active == 1 && bs->bs_state_cb != NULL) 1750 (*bs->bs_state_cb)(bp->bp_ifp, bp->bp_state); 1751 } 1752 1753 /* 1754 * Flush the routes on the bridge port, we need to do this from a 1755 * taskqueue to avoid a LOR. 1756 */ 1757 static void 1758 bstp_notify_rtage(void *arg, int pending) 1759 { 1760 struct bstp_port *bp = (struct bstp_port *)arg; 1761 struct bstp_state *bs = bp->bp_bs; 1762 int age = 0; 1763 1764 BSTP_LOCK(bs); 1765 switch (bp->bp_protover) { 1766 case BSTP_PROTO_STP: 1767 /* convert to seconds */ 1768 age = bp->bp_desg_fdelay / BSTP_TICK_VAL; 1769 break; 1770 1771 case BSTP_PROTO_RSTP: 1772 age = 0; 1773 break; 1774 } 1775 BSTP_UNLOCK(bs); 1776 1777 if (bp->bp_active == 1 && bs->bs_rtage_cb != NULL) 1778 (*bs->bs_rtage_cb)(bp->bp_ifp, age); 1779 1780 /* flush is complete */ 1781 BSTP_LOCK(bs); 1782 bp->bp_fdbflush = 0; 1783 BSTP_UNLOCK(bs); 1784 } 1785 1786 void 1787 bstp_linkstate(struct ifnet *ifp, int state) 1788 { 1789 struct bstp_state *bs; 1790 struct bstp_port *bp; 1791 1792 /* search for the stp port */ 1793 mtx_lock(&bstp_list_mtx); 1794 LIST_FOREACH(bs, &bstp_list, bs_list) { 1795 BSTP_LOCK(bs); 1796 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1797 if (bp->bp_ifp == ifp) { 1798 bstp_ifupdstatus(bs, bp); 1799 bstp_update_state(bs, bp); 1800 /* it only exists once so return */ 1801 BSTP_UNLOCK(bs); 1802 mtx_unlock(&bstp_list_mtx); 1803 return; 1804 } 1805 } 1806 BSTP_UNLOCK(bs); 1807 } 1808 mtx_unlock(&bstp_list_mtx); 1809 } 1810 1811 static void 1812 bstp_ifupdstatus(struct bstp_state *bs, struct bstp_port *bp) 1813 { 1814 struct ifnet *ifp = bp->bp_ifp; 1815 struct ifmediareq ifmr; 1816 int error = 0; 1817 1818 BSTP_LOCK_ASSERT(bs); 1819 1820 bzero((char *)&ifmr, sizeof(ifmr)); 1821 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr); 1822 1823 if ((error == 0) && (ifp->if_flags & IFF_UP)) { 1824 if (ifmr.ifm_status & IFM_ACTIVE) { 1825 /* A full-duplex link is assumed to be point to point */ 1826 if (bp->bp_flags & BSTP_PORT_AUTOPTP) { 1827 bp->bp_ptp_link = 1828 ifmr.ifm_active & IFM_FDX ? 1 : 0; 1829 } 1830 1831 /* Calc the cost if the link was down previously */ 1832 if (bp->bp_flags & BSTP_PORT_PNDCOST) { 1833 bp->bp_path_cost = bstp_calc_path_cost(bp); 1834 bp->bp_flags &= ~BSTP_PORT_PNDCOST; 1835 } 1836 1837 if (bp->bp_role == BSTP_ROLE_DISABLED) 1838 bstp_enable_port(bs, bp); 1839 } else { 1840 if (bp->bp_role != BSTP_ROLE_DISABLED) { 1841 bstp_disable_port(bs, bp); 1842 if ((bp->bp_flags & BSTP_PORT_ADMEDGE) && 1843 bp->bp_protover == BSTP_PROTO_RSTP) 1844 bp->bp_operedge = 1; 1845 } 1846 } 1847 return; 1848 } 1849 1850 if (bp->bp_infois != BSTP_INFO_DISABLED) 1851 bstp_disable_port(bs, bp); 1852 } 1853 1854 static void 1855 bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp) 1856 { 1857 bp->bp_infois = BSTP_INFO_AGED; 1858 bstp_assign_roles(bs); 1859 } 1860 1861 static void 1862 bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp) 1863 { 1864 bp->bp_infois = BSTP_INFO_DISABLED; 1865 bstp_assign_roles(bs); 1866 } 1867 1868 static void 1869 bstp_tick(void *arg) 1870 { 1871 struct bstp_state *bs = arg; 1872 struct bstp_port *bp; 1873 1874 BSTP_LOCK_ASSERT(bs); 1875 1876 if (bs->bs_running == 0) 1877 return; 1878 1879 /* slow timer to catch missed link events */ 1880 if (bstp_timer_expired(&bs->bs_link_timer)) { 1881 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1882 bstp_ifupdstatus(bs, bp); 1883 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 1884 } 1885 1886 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1887 /* no events need to happen for these */ 1888 bstp_timer_expired(&bp->bp_tc_timer); 1889 bstp_timer_expired(&bp->bp_recent_root_timer); 1890 bstp_timer_expired(&bp->bp_forward_delay_timer); 1891 bstp_timer_expired(&bp->bp_recent_backup_timer); 1892 1893 if (bstp_timer_expired(&bp->bp_hello_timer)) 1894 bstp_hello_timer_expiry(bs, bp); 1895 1896 if (bstp_timer_expired(&bp->bp_message_age_timer)) 1897 bstp_message_age_expiry(bs, bp); 1898 1899 if (bstp_timer_expired(&bp->bp_migrate_delay_timer)) 1900 bstp_migrate_delay_expiry(bs, bp); 1901 1902 if (bstp_timer_expired(&bp->bp_edge_delay_timer)) 1903 bstp_edge_delay_expiry(bs, bp); 1904 1905 /* update the various state machines for the port */ 1906 bstp_update_state(bs, bp); 1907 1908 if (bp->bp_txcount > 0) 1909 bp->bp_txcount--; 1910 } 1911 1912 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 1913 } 1914 1915 static void 1916 bstp_timer_start(struct bstp_timer *t, uint16_t v) 1917 { 1918 t->value = v; 1919 t->active = 1; 1920 t->latched = 0; 1921 } 1922 1923 static void 1924 bstp_timer_stop(struct bstp_timer *t) 1925 { 1926 t->value = 0; 1927 t->active = 0; 1928 t->latched = 0; 1929 } 1930 1931 static void 1932 bstp_timer_latch(struct bstp_timer *t) 1933 { 1934 t->latched = 1; 1935 t->active = 1; 1936 } 1937 1938 static int 1939 bstp_timer_expired(struct bstp_timer *t) 1940 { 1941 if (t->active == 0 || t->latched) 1942 return (0); 1943 t->value -= BSTP_TICK_VAL; 1944 if (t->value <= 0) { 1945 bstp_timer_stop(t); 1946 return (1); 1947 } 1948 return (0); 1949 } 1950 1951 static void 1952 bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp) 1953 { 1954 if ((bp->bp_flags & BSTP_PORT_NEWINFO) || 1955 bp->bp_role == BSTP_ROLE_DESIGNATED || 1956 (bp->bp_role == BSTP_ROLE_ROOT && 1957 bp->bp_tc_timer.active == 1)) { 1958 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 1959 bp->bp_flags |= BSTP_PORT_NEWINFO; 1960 bstp_transmit(bs, bp); 1961 } 1962 } 1963 1964 static void 1965 bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp) 1966 { 1967 if (bp->bp_infois == BSTP_INFO_RECEIVED) { 1968 bp->bp_infois = BSTP_INFO_AGED; 1969 bstp_assign_roles(bs); 1970 DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname); 1971 } 1972 } 1973 1974 static void 1975 bstp_migrate_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 1976 { 1977 bp->bp_flags |= BSTP_PORT_CANMIGRATE; 1978 } 1979 1980 static void 1981 bstp_edge_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 1982 { 1983 if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) && 1984 bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing && 1985 bp->bp_role == BSTP_ROLE_DESIGNATED) { 1986 bp->bp_operedge = 1; 1987 DPRINTF("%s -> edge port\n", bp->bp_ifp->if_xname); 1988 } 1989 } 1990 1991 static int 1992 bstp_addr_cmp(const uint8_t *a, const uint8_t *b) 1993 { 1994 int i, d; 1995 1996 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 1997 d = ((int)a[i]) - ((int)b[i]); 1998 } 1999 2000 return (d); 2001 } 2002 2003 /* 2004 * compare the bridge address component of the bridgeid 2005 */ 2006 static int 2007 bstp_same_bridgeid(uint64_t id1, uint64_t id2) 2008 { 2009 u_char addr1[ETHER_ADDR_LEN]; 2010 u_char addr2[ETHER_ADDR_LEN]; 2011 2012 PV2ADDR(id1, addr1); 2013 PV2ADDR(id2, addr2); 2014 2015 if (bstp_addr_cmp(addr1, addr2) == 0) 2016 return (1); 2017 2018 return (0); 2019 } 2020 2021 void 2022 bstp_reinit(struct bstp_state *bs) 2023 { 2024 INIT_VNET_NET(curvnet); 2025 struct bstp_port *bp; 2026 struct ifnet *ifp, *mif; 2027 u_char *e_addr; 2028 static const u_char llzero[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 2029 2030 BSTP_LOCK_ASSERT(bs); 2031 2032 mif = NULL; 2033 /* 2034 * Search through the Ethernet adapters and find the one with the 2035 * lowest value. The adapter which we take the MAC address from does 2036 * not need to be part of the bridge, it just needs to be a unique 2037 * value. 2038 */ 2039 IFNET_RLOCK(); 2040 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2041 if (ifp->if_type != IFT_ETHER) 2042 continue; 2043 2044 if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0) 2045 continue; 2046 2047 if (mif == NULL) { 2048 mif = ifp; 2049 continue; 2050 } 2051 if (bstp_addr_cmp(IF_LLADDR(ifp), IF_LLADDR(mif)) < 0) { 2052 mif = ifp; 2053 continue; 2054 } 2055 } 2056 IFNET_RUNLOCK(); 2057 2058 if (LIST_EMPTY(&bs->bs_bplist) || mif == NULL) { 2059 /* Set the bridge and root id (lower bits) to zero */ 2060 bs->bs_bridge_pv.pv_dbridge_id = 2061 ((uint64_t)bs->bs_bridge_priority) << 48; 2062 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2063 bs->bs_root_pv = bs->bs_bridge_pv; 2064 /* Disable any remaining ports, they will have no MAC address */ 2065 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2066 bp->bp_infois = BSTP_INFO_DISABLED; 2067 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2068 } 2069 callout_stop(&bs->bs_bstpcallout); 2070 return; 2071 } 2072 2073 e_addr = IF_LLADDR(mif); 2074 bs->bs_bridge_pv.pv_dbridge_id = 2075 (((uint64_t)bs->bs_bridge_priority) << 48) | 2076 (((uint64_t)e_addr[0]) << 40) | 2077 (((uint64_t)e_addr[1]) << 32) | 2078 (((uint64_t)e_addr[2]) << 24) | 2079 (((uint64_t)e_addr[3]) << 16) | 2080 (((uint64_t)e_addr[4]) << 8) | 2081 (((uint64_t)e_addr[5])); 2082 2083 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 2084 bs->bs_bridge_pv.pv_cost = 0; 2085 bs->bs_bridge_pv.pv_dport_id = 0; 2086 bs->bs_bridge_pv.pv_port_id = 0; 2087 2088 if (bs->bs_running && callout_pending(&bs->bs_bstpcallout) == 0) 2089 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2090 2091 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2092 bp->bp_port_id = (bp->bp_priority << 8) | 2093 (bp->bp_ifp->if_index & 0xfff); 2094 bstp_ifupdstatus(bs, bp); 2095 } 2096 2097 bstp_assign_roles(bs); 2098 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 2099 } 2100 2101 static int 2102 bstp_modevent(module_t mod, int type, void *data) 2103 { 2104 switch (type) { 2105 case MOD_LOAD: 2106 mtx_init(&bstp_list_mtx, "bridgestp list", NULL, MTX_DEF); 2107 LIST_INIT(&bstp_list); 2108 bstp_linkstate_p = bstp_linkstate; 2109 break; 2110 case MOD_UNLOAD: 2111 bstp_linkstate_p = NULL; 2112 mtx_destroy(&bstp_list_mtx); 2113 break; 2114 default: 2115 return (EOPNOTSUPP); 2116 } 2117 return (0); 2118 } 2119 2120 static moduledata_t bstp_mod = { 2121 "bridgestp", 2122 bstp_modevent, 2123 0 2124 }; 2125 2126 DECLARE_MODULE(bridgestp, bstp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2127 MODULE_VERSION(bridgestp, 1); 2128 2129 void 2130 bstp_attach(struct bstp_state *bs, struct bstp_cb_ops *cb) 2131 { 2132 BSTP_LOCK_INIT(bs); 2133 callout_init_mtx(&bs->bs_bstpcallout, &bs->bs_mtx, 0); 2134 LIST_INIT(&bs->bs_bplist); 2135 2136 bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 2137 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 2138 bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY; 2139 bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 2140 bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME; 2141 bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY; 2142 bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT; 2143 bs->bs_protover = BSTP_PROTO_RSTP; 2144 bs->bs_state_cb = cb->bcb_state; 2145 bs->bs_rtage_cb = cb->bcb_rtage; 2146 2147 getmicrotime(&bs->bs_last_tc_time); 2148 2149 mtx_lock(&bstp_list_mtx); 2150 LIST_INSERT_HEAD(&bstp_list, bs, bs_list); 2151 mtx_unlock(&bstp_list_mtx); 2152 } 2153 2154 void 2155 bstp_detach(struct bstp_state *bs) 2156 { 2157 KASSERT(LIST_EMPTY(&bs->bs_bplist), ("bstp still active")); 2158 2159 mtx_lock(&bstp_list_mtx); 2160 LIST_REMOVE(bs, bs_list); 2161 mtx_unlock(&bstp_list_mtx); 2162 callout_drain(&bs->bs_bstpcallout); 2163 BSTP_LOCK_DESTROY(bs); 2164 } 2165 2166 void 2167 bstp_init(struct bstp_state *bs) 2168 { 2169 BSTP_LOCK(bs); 2170 callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs); 2171 bs->bs_running = 1; 2172 bstp_reinit(bs); 2173 BSTP_UNLOCK(bs); 2174 } 2175 2176 void 2177 bstp_stop(struct bstp_state *bs) 2178 { 2179 struct bstp_port *bp; 2180 2181 BSTP_LOCK(bs); 2182 2183 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 2184 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2185 2186 bs->bs_running = 0; 2187 callout_stop(&bs->bs_bstpcallout); 2188 BSTP_UNLOCK(bs); 2189 } 2190 2191 int 2192 bstp_create(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *ifp) 2193 { 2194 bzero(bp, sizeof(struct bstp_port)); 2195 2196 BSTP_LOCK(bs); 2197 bp->bp_ifp = ifp; 2198 bp->bp_bs = bs; 2199 bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY; 2200 TASK_INIT(&bp->bp_statetask, 0, bstp_notify_state, bp); 2201 TASK_INIT(&bp->bp_rtagetask, 0, bstp_notify_rtage, bp); 2202 2203 /* Init state */ 2204 bp->bp_infois = BSTP_INFO_DISABLED; 2205 bp->bp_flags = BSTP_PORT_AUTOEDGE|BSTP_PORT_AUTOPTP; 2206 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2207 bstp_set_port_proto(bp, bs->bs_protover); 2208 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2209 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 2210 bp->bp_path_cost = bstp_calc_path_cost(bp); 2211 BSTP_UNLOCK(bs); 2212 return (0); 2213 } 2214 2215 int 2216 bstp_enable(struct bstp_port *bp) 2217 { 2218 struct bstp_state *bs = bp->bp_bs; 2219 struct ifnet *ifp = bp->bp_ifp; 2220 2221 KASSERT(bp->bp_active == 0, ("already a bstp member")); 2222 2223 switch (ifp->if_type) { 2224 case IFT_ETHER: /* These can do spanning tree. */ 2225 break; 2226 default: 2227 /* Nothing else can. */ 2228 return (EINVAL); 2229 } 2230 2231 BSTP_LOCK(bs); 2232 LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next); 2233 bp->bp_active = 1; 2234 bp->bp_flags |= BSTP_PORT_NEWINFO; 2235 bstp_reinit(bs); 2236 bstp_update_roles(bs, bp); 2237 BSTP_UNLOCK(bs); 2238 return (0); 2239 } 2240 2241 void 2242 bstp_disable(struct bstp_port *bp) 2243 { 2244 struct bstp_state *bs = bp->bp_bs; 2245 2246 KASSERT(bp->bp_active == 1, ("not a bstp member")); 2247 2248 BSTP_LOCK(bs); 2249 bstp_disable_port(bs, bp); 2250 LIST_REMOVE(bp, bp_next); 2251 bp->bp_active = 0; 2252 bstp_reinit(bs); 2253 BSTP_UNLOCK(bs); 2254 } 2255 2256 /* 2257 * The bstp_port structure is about to be freed by the parent bridge. 2258 */ 2259 void 2260 bstp_destroy(struct bstp_port *bp) 2261 { 2262 KASSERT(bp->bp_active == 0, ("port is still attached")); 2263 taskqueue_drain(taskqueue_swi, &bp->bp_statetask); 2264 taskqueue_drain(taskqueue_swi, &bp->bp_rtagetask); 2265 } 2266