1 /* $OpenBSD: bridgestp.c,v 1.36 2008/09/10 14:01:23 blambert 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 30 /* 31 * Implementation of the spanning tree protocol as defined in 32 * ISO/IEC 802.1D-2004, June 9, 2004. 33 */ 34 35 #if 0 36 __FBSDID("$FreeBSD: /repoman/r/ncvs/src/sys/net/bridgestp.c,v 1.25 2006/11/03 03:34:04 thompsa Exp $"); 37 #endif 38 39 #include "bridge.h" 40 41 #if NBRIDGE > 0 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/mbuf.h> 46 #include <sys/socket.h> 47 #include <sys/ioctl.h> 48 #include <sys/device.h> 49 #include <sys/kernel.h> 50 #include <sys/timeout.h> 51 52 #include <net/if.h> 53 #include <net/if_types.h> 54 #include <net/if_dl.h> 55 #include <net/if_llc.h> 56 #include <net/if_media.h> 57 #include <net/route.h> 58 #include <net/netisr.h> 59 60 #ifdef INET 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/in_var.h> 64 #include <netinet/ip.h> 65 #include <netinet/if_ether.h> 66 #endif 67 68 #include <net/if_bridge.h> 69 70 /* STP port states */ 71 #define BSTP_IFSTATE_DISABLED 0 72 #define BSTP_IFSTATE_LISTENING 1 73 #define BSTP_IFSTATE_LEARNING 2 74 #define BSTP_IFSTATE_FORWARDING 3 75 #define BSTP_IFSTATE_BLOCKING 4 76 #define BSTP_IFSTATE_DISCARDING 5 77 78 #define BSTP_TCSTATE_ACTIVE 1 79 #define BSTP_TCSTATE_DETECTED 2 80 #define BSTP_TCSTATE_INACTIVE 3 81 #define BSTP_TCSTATE_LEARNING 4 82 #define BSTP_TCSTATE_PROPAG 5 83 #define BSTP_TCSTATE_ACK 6 84 #define BSTP_TCSTATE_TC 7 85 #define BSTP_TCSTATE_TCN 8 86 87 #define BSTP_ROLE_DISABLED 0 88 #define BSTP_ROLE_ROOT 1 89 #define BSTP_ROLE_DESIGNATED 2 90 #define BSTP_ROLE_ALTERNATE 3 91 #define BSTP_ROLE_BACKUP 4 92 93 /* STP port flags */ 94 #define BSTP_PORT_CANMIGRATE 0x0001 95 #define BSTP_PORT_NEWINFO 0x0002 96 #define BSTP_PORT_DISPUTED 0x0004 97 #define BSTP_PORT_ADMCOST 0x0008 98 #define BSTP_PORT_AUTOEDGE 0x0010 99 100 /* BPDU priority */ 101 #define BSTP_PDU_SUPERIOR 1 102 #define BSTP_PDU_REPEATED 2 103 #define BSTP_PDU_INFERIOR 3 104 #define BSTP_PDU_INFERIORALT 4 105 #define BSTP_PDU_OTHER 5 106 107 /* BPDU flags */ 108 #define BSTP_PDU_PRMASK 0x0c /* Port Role */ 109 #define BSTP_PDU_PRSHIFT 2 /* Port Role offset */ 110 #define BSTP_PDU_F_UNKN 0x00 /* Unknown port (00) */ 111 #define BSTP_PDU_F_ALT 0x01 /* Alt/Backup port (01) */ 112 #define BSTP_PDU_F_ROOT 0x02 /* Root port (10) */ 113 #define BSTP_PDU_F_DESG 0x03 /* Designated port (11) */ 114 115 #define BSTP_PDU_STPMASK 0x81 /* strip unused STP flags */ 116 #define BSTP_PDU_RSTPMASK 0x7f /* strip unused RSTP flags */ 117 #define BSTP_PDU_F_TC 0x01 /* Topology change */ 118 #define BSTP_PDU_F_P 0x02 /* Proposal flag */ 119 #define BSTP_PDU_F_L 0x10 /* Learning flag */ 120 #define BSTP_PDU_F_F 0x20 /* Forwarding flag */ 121 #define BSTP_PDU_F_A 0x40 /* Agreement flag */ 122 #define BSTP_PDU_F_TCA 0x80 /* Topology change ack */ 123 124 /* 125 * Spanning tree defaults. 126 */ 127 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 128 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 129 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 130 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 131 #define BSTP_DEFAULT_MIGRATE_DELAY (3 * 256) 132 #define BSTP_DEFAULT_HOLD_COUNT 6 133 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 134 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 135 #define BSTP_DEFAULT_PATH_COST 55 136 #define BSTP_MIN_HELLO_TIME (1 * 256) 137 #define BSTP_MIN_MAX_AGE (6 * 256) 138 #define BSTP_MIN_FORWARD_DELAY (4 * 256) 139 #define BSTP_MIN_HOLD_COUNT 1 140 #define BSTP_MAX_HELLO_TIME (2 * 256) 141 #define BSTP_MAX_MAX_AGE (40 * 256) 142 #define BSTP_MAX_FORWARD_DELAY (30 * 256) 143 #define BSTP_MAX_HOLD_COUNT 10 144 #define BSTP_MAX_PRIORITY 61440 145 #define BSTP_MAX_PORT_PRIORITY 240 146 #define BSTP_MAX_PATH_COST 200000000 147 148 /* BPDU message types */ 149 #define BSTP_MSGTYPE_CFG 0x00 /* Configuration */ 150 #define BSTP_MSGTYPE_RSTP 0x02 /* Rapid STP */ 151 #define BSTP_MSGTYPE_TCN 0x80 /* Topology chg notification */ 152 153 #define BSTP_INFO_RECEIVED 1 154 #define BSTP_INFO_MINE 2 155 #define BSTP_INFO_AGED 3 156 #define BSTP_INFO_DISABLED 4 157 158 #define BSTP_MESSAGE_AGE_INCR (1 * 256) /* in 256ths of a second */ 159 #define BSTP_TICK_VAL (1 * 256) /* in 256ths of a second */ 160 #define BSTP_LINK_TIMER (BSTP_TICK_VAL * 15) 161 162 #ifdef BRIDGESTP_DEBUG 163 #define DPRINTF(fmt, arg...) printf("bstp: " fmt, ##arg) 164 #else 165 #define DPRINTF(fmt, arg...) 166 #endif 167 168 #define PV2ADDR(pv, eaddr) do { \ 169 eaddr[0] = pv >> 40; \ 170 eaddr[1] = pv >> 32; \ 171 eaddr[2] = pv >> 24; \ 172 eaddr[3] = pv >> 16; \ 173 eaddr[4] = pv >> 8; \ 174 eaddr[5] = pv >> 0; \ 175 } while (0) 176 177 #define INFO_BETTER 1 178 #define INFO_SAME 0 179 #define INFO_WORSE -1 180 181 /* 182 * Because BPDU's do not make nicely aligned structures, two different 183 * declarations are used: bstp_?bpdu (wire representation, packed) and 184 * bstp_*_unit (internal, nicely aligned version). 185 */ 186 187 /* configuration bridge protocol data unit */ 188 struct bstp_cbpdu { 189 u_int8_t cbu_dsap; /* LLC: destination sap */ 190 u_int8_t cbu_ssap; /* LLC: source sap */ 191 u_int8_t cbu_ctl; /* LLC: control */ 192 u_int16_t cbu_protoid; /* protocol id */ 193 u_int8_t cbu_protover; /* protocol version */ 194 u_int8_t cbu_bpdutype; /* message type */ 195 u_int8_t cbu_flags; /* flags (below) */ 196 197 /* root id */ 198 u_int16_t cbu_rootpri; /* root priority */ 199 u_int8_t cbu_rootaddr[6]; /* root address */ 200 201 u_int32_t cbu_rootpathcost; /* root path cost */ 202 203 /* bridge id */ 204 u_int16_t cbu_bridgepri; /* bridge priority */ 205 u_int8_t cbu_bridgeaddr[6]; /* bridge address */ 206 207 u_int16_t cbu_portid; /* port id */ 208 u_int16_t cbu_messageage; /* current message age */ 209 u_int16_t cbu_maxage; /* maximum age */ 210 u_int16_t cbu_hellotime; /* hello time */ 211 u_int16_t cbu_forwarddelay; /* forwarding delay */ 212 u_int8_t cbu_versionlen; /* version 1 length */ 213 } __packed; 214 215 #define BSTP_BPDU_STP_LEN (3 + 35) /* LLC + STP pdu */ 216 #define BSTP_BPDU_RSTP_LEN (3 + 36) /* LLC + RSTP pdu */ 217 218 /* topology change notification bridge protocol data unit */ 219 struct bstp_tbpdu { 220 u_int8_t tbu_dsap; /* LLC: destination sap */ 221 u_int8_t tbu_ssap; /* LLC: source sap */ 222 u_int8_t tbu_ctl; /* LLC: control */ 223 u_int16_t tbu_protoid; /* protocol id */ 224 u_int8_t tbu_protover; /* protocol version */ 225 u_int8_t tbu_bpdutype; /* message type */ 226 } __packed; 227 228 const u_int8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; 229 230 LIST_HEAD(, bstp_state) bstp_list; 231 232 void bstp_transmit(struct bstp_state *, struct bstp_port *); 233 void bstp_transmit_bpdu(struct bstp_state *, struct bstp_port *); 234 void bstp_transmit_tcn(struct bstp_state *, struct bstp_port *); 235 void bstp_decode_bpdu(struct bstp_port *, struct bstp_cbpdu *, 236 struct bstp_config_unit *); 237 void bstp_send_bpdu(struct bstp_state *, struct bstp_port *, 238 struct bstp_cbpdu *); 239 int bstp_pdu_flags(struct bstp_port *); 240 void bstp_received_stp(struct bstp_state *, struct bstp_port *, 241 struct mbuf **, struct bstp_tbpdu *); 242 void bstp_received_rstp(struct bstp_state *, struct bstp_port *, 243 struct mbuf **, struct bstp_tbpdu *); 244 void bstp_received_tcn(struct bstp_state *, struct bstp_port *, 245 struct bstp_tcn_unit *); 246 void bstp_received_bpdu(struct bstp_state *, struct bstp_port *, 247 struct bstp_config_unit *); 248 int bstp_pdu_rcvtype(struct bstp_port *, struct bstp_config_unit *); 249 int bstp_pdu_bettersame(struct bstp_port *, int); 250 int bstp_info_cmp(struct bstp_pri_vector *, 251 struct bstp_pri_vector *); 252 int bstp_info_superior(struct bstp_pri_vector *, 253 struct bstp_pri_vector *); 254 void bstp_assign_roles(struct bstp_state *); 255 void bstp_update_roles(struct bstp_state *, struct bstp_port *); 256 void bstp_update_state(struct bstp_state *, struct bstp_port *); 257 void bstp_update_tc(struct bstp_port *); 258 void bstp_update_info(struct bstp_port *); 259 void bstp_set_other_tcprop(struct bstp_port *); 260 void bstp_set_all_reroot(struct bstp_state *); 261 void bstp_set_all_sync(struct bstp_state *); 262 void bstp_set_port_state(struct bstp_port *, int); 263 void bstp_set_port_role(struct bstp_port *, int); 264 void bstp_set_port_proto(struct bstp_port *, int); 265 void bstp_set_port_tc(struct bstp_port *, int); 266 void bstp_set_timer_tc(struct bstp_port *); 267 void bstp_set_timer_msgage(struct bstp_port *); 268 int bstp_rerooted(struct bstp_state *, struct bstp_port *); 269 u_int32_t bstp_calc_path_cost(struct bstp_port *); 270 void bstp_notify_rtage(void *, int); 271 void bstp_ifupdstatus(struct bstp_state *, struct bstp_port *); 272 void bstp_enable_port(struct bstp_state *, struct bstp_port *); 273 void bstp_disable_port(struct bstp_state *, struct bstp_port *); 274 void bstp_tick(void *); 275 void bstp_timer_start(struct bstp_timer *, u_int16_t); 276 void bstp_timer_stop(struct bstp_timer *); 277 void bstp_timer_latch(struct bstp_timer *); 278 int bstp_timer_expired(struct bstp_timer *); 279 void bstp_hello_timer_expiry(struct bstp_state *, 280 struct bstp_port *); 281 void bstp_message_age_expiry(struct bstp_state *, 282 struct bstp_port *); 283 void bstp_migrate_delay_expiry(struct bstp_state *, 284 struct bstp_port *); 285 void bstp_edge_delay_expiry(struct bstp_state *, 286 struct bstp_port *); 287 int bstp_addr_cmp(const u_int8_t *, const u_int8_t *); 288 int bstp_same_bridgeid(u_int64_t, u_int64_t); 289 290 void 291 bstp_attach(int n) 292 { 293 LIST_INIT(&bstp_list); 294 } 295 296 void 297 bstp_transmit(struct bstp_state *bs, struct bstp_port *bp) 298 { 299 if ((bs->bs_ifflags & IFF_RUNNING) == 0 || bp == NULL) 300 return; 301 302 /* 303 * a PDU can only be sent if we have tx quota left and the 304 * hello timer is running. 305 */ 306 if (bp->bp_hello_timer.active == 0) { 307 /* Test if it needs to be reset */ 308 bstp_hello_timer_expiry(bs, bp); 309 return; 310 } 311 if (bp->bp_txcount > bs->bs_txholdcount) 312 /* Ran out of karma */ 313 return; 314 315 if (bp->bp_protover == BSTP_PROTO_RSTP) { 316 bstp_transmit_bpdu(bs, bp); 317 bp->bp_tc_ack = 0; 318 } else { /* STP */ 319 switch (bp->bp_role) { 320 case BSTP_ROLE_DESIGNATED: 321 bstp_transmit_bpdu(bs, bp); 322 bp->bp_tc_ack = 0; 323 break; 324 325 case BSTP_ROLE_ROOT: 326 bstp_transmit_tcn(bs, bp); 327 break; 328 } 329 } 330 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 331 bp->bp_flags &= ~BSTP_PORT_NEWINFO; 332 } 333 334 void 335 bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp) 336 { 337 struct bstp_cbpdu bpdu; 338 339 bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48); 340 PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr); 341 342 bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost); 343 344 bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48); 345 PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr); 346 347 bpdu.cbu_portid = htons(bp->bp_port_id); 348 bpdu.cbu_messageage = htons(bp->bp_desg_msg_age); 349 bpdu.cbu_maxage = htons(bp->bp_desg_max_age); 350 bpdu.cbu_hellotime = htons(bp->bp_desg_htime); 351 bpdu.cbu_forwarddelay = htons(bp->bp_desg_fdelay); 352 353 bpdu.cbu_flags = bstp_pdu_flags(bp); 354 355 switch (bp->bp_protover) { 356 case BSTP_PROTO_STP: 357 bpdu.cbu_bpdutype = BSTP_MSGTYPE_CFG; 358 break; 359 case BSTP_PROTO_RSTP: 360 bpdu.cbu_bpdutype = BSTP_MSGTYPE_RSTP; 361 break; 362 } 363 364 bstp_send_bpdu(bs, bp, &bpdu); 365 } 366 367 void 368 bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp) 369 { 370 struct bstp_tbpdu bpdu; 371 struct ifnet *ifp = bp->bp_ifp; 372 struct ether_header *eh; 373 struct mbuf *m; 374 int s, len, error; 375 376 if (ifp == NULL || (ifp->if_flags & IFF_RUNNING) == 0) 377 return; 378 379 MGETHDR(m, M_DONTWAIT, MT_DATA); 380 if (m == NULL) 381 return; 382 m->m_pkthdr.rcvif = ifp; 383 m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); 384 m->m_len = m->m_pkthdr.len; 385 386 eh = mtod(m, struct ether_header *); 387 bcopy(LLADDR(ifp->if_sadl), eh->ether_shost, ETHER_ADDR_LEN); 388 bcopy(bstp_etheraddr, eh->ether_dhost, ETHER_ADDR_LEN); 389 eh->ether_type = htons(sizeof(bpdu)); 390 391 bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP; 392 bpdu.tbu_ctl = LLC_UI; 393 bpdu.tbu_protoid = 0; 394 bpdu.tbu_protover = 0; 395 bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN; 396 bcopy(&bpdu, mtod(m, caddr_t) + sizeof(*eh), sizeof(bpdu)); 397 398 s = splnet(); 399 bp->bp_txcount++; 400 len = m->m_pkthdr.len; 401 IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error); 402 if (error == 0) { 403 ifp->if_obytes += len; 404 ifp->if_omcasts++; 405 if_start(ifp); 406 } 407 splx(s); 408 } 409 410 void 411 bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu, 412 struct bstp_config_unit *cu) 413 { 414 int flags; 415 416 cu->cu_pv.pv_root_id = 417 (((u_int64_t)ntohs(cpdu->cbu_rootpri)) << 48) | 418 (((u_int64_t)cpdu->cbu_rootaddr[0]) << 40) | 419 (((u_int64_t)cpdu->cbu_rootaddr[1]) << 32) | 420 (((u_int64_t)cpdu->cbu_rootaddr[2]) << 24) | 421 (((u_int64_t)cpdu->cbu_rootaddr[3]) << 16) | 422 (((u_int64_t)cpdu->cbu_rootaddr[4]) << 8) | 423 (((u_int64_t)cpdu->cbu_rootaddr[5]) << 0); 424 425 cu->cu_pv.pv_dbridge_id = 426 (((u_int64_t)ntohs(cpdu->cbu_bridgepri)) << 48) | 427 (((u_int64_t)cpdu->cbu_bridgeaddr[0]) << 40) | 428 (((u_int64_t)cpdu->cbu_bridgeaddr[1]) << 32) | 429 (((u_int64_t)cpdu->cbu_bridgeaddr[2]) << 24) | 430 (((u_int64_t)cpdu->cbu_bridgeaddr[3]) << 16) | 431 (((u_int64_t)cpdu->cbu_bridgeaddr[4]) << 8) | 432 (((u_int64_t)cpdu->cbu_bridgeaddr[5]) << 0); 433 434 cu->cu_pv.pv_cost = ntohl(cpdu->cbu_rootpathcost); 435 cu->cu_message_age = ntohs(cpdu->cbu_messageage); 436 cu->cu_max_age = ntohs(cpdu->cbu_maxage); 437 cu->cu_hello_time = ntohs(cpdu->cbu_hellotime); 438 cu->cu_forward_delay = ntohs(cpdu->cbu_forwarddelay); 439 cu->cu_pv.pv_dport_id = ntohs(cpdu->cbu_portid); 440 cu->cu_pv.pv_port_id = bp->bp_port_id; 441 cu->cu_message_type = cpdu->cbu_bpdutype; 442 443 /* Strip off unused flags in STP mode */ 444 flags = cpdu->cbu_flags; 445 switch (cpdu->cbu_protover) { 446 case BSTP_PROTO_STP: 447 flags &= BSTP_PDU_STPMASK; 448 /* A STP BPDU explicitly conveys a Designated Port */ 449 cu->cu_role = BSTP_ROLE_DESIGNATED; 450 break; 451 case BSTP_PROTO_RSTP: 452 flags &= BSTP_PDU_RSTPMASK; 453 break; 454 } 455 456 cu->cu_topology_change_ack = 457 (flags & BSTP_PDU_F_TCA) ? 1 : 0; 458 cu->cu_proposal = 459 (flags & BSTP_PDU_F_P) ? 1 : 0; 460 cu->cu_agree = 461 (flags & BSTP_PDU_F_A) ? 1 : 0; 462 cu->cu_learning = 463 (flags & BSTP_PDU_F_L) ? 1 : 0; 464 cu->cu_forwarding = 465 (flags & BSTP_PDU_F_F) ? 1 : 0; 466 cu->cu_topology_change = 467 (flags & BSTP_PDU_F_TC) ? 1 : 0; 468 469 switch ((flags & BSTP_PDU_PRMASK) >> BSTP_PDU_PRSHIFT) { 470 case BSTP_PDU_F_ROOT: 471 cu->cu_role = BSTP_ROLE_ROOT; 472 break; 473 case BSTP_PDU_F_ALT: 474 cu->cu_role = BSTP_ROLE_ALTERNATE; 475 break; 476 case BSTP_PDU_F_DESG: 477 cu->cu_role = BSTP_ROLE_DESIGNATED; 478 break; 479 } 480 } 481 482 void 483 bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp, 484 struct bstp_cbpdu *bpdu) 485 { 486 struct ifnet *ifp = bp->bp_ifp; 487 struct mbuf *m; 488 struct ether_header *eh; 489 int s, len, error; 490 491 s = splnet(); 492 if (ifp == NULL || (ifp->if_flags & IFF_RUNNING) == 0) 493 goto done; 494 495 #ifdef ALTQ 496 if (!ALTQ_IS_ENABLED(&ifp->if_snd)) 497 #endif 498 if (IF_QFULL(&ifp->if_snd)) 499 goto done; 500 501 MGETHDR(m, M_DONTWAIT, MT_DATA); 502 if (m == NULL) 503 goto done; 504 505 eh = mtod(m, struct ether_header *); 506 507 bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP; 508 bpdu->cbu_ctl = LLC_UI; 509 bpdu->cbu_protoid = htons(BSTP_PROTO_ID); 510 511 memcpy(eh->ether_shost, LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 512 memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); 513 514 switch (bpdu->cbu_bpdutype) { 515 case BSTP_MSGTYPE_CFG: 516 bpdu->cbu_protover = BSTP_PROTO_STP; 517 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_STP_LEN; 518 eh->ether_type = htons(BSTP_BPDU_STP_LEN); 519 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, 520 BSTP_BPDU_STP_LEN); 521 break; 522 case BSTP_MSGTYPE_RSTP: 523 bpdu->cbu_protover = BSTP_PROTO_RSTP; 524 bpdu->cbu_versionlen = htons(0); 525 m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_RSTP_LEN; 526 eh->ether_type = htons(BSTP_BPDU_RSTP_LEN); 527 memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, 528 BSTP_BPDU_RSTP_LEN); 529 break; 530 default: 531 panic("not implemented"); 532 } 533 m->m_pkthdr.rcvif = ifp; 534 m->m_len = m->m_pkthdr.len; 535 536 bp->bp_txcount++; 537 len = m->m_pkthdr.len; 538 IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error); 539 if (error == 0) { 540 ifp->if_obytes += len; 541 ifp->if_omcasts++; 542 if_start(ifp); 543 } 544 done: 545 splx(s); 546 } 547 548 int 549 bstp_pdu_flags(struct bstp_port *bp) 550 { 551 int flags = 0; 552 553 if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING) 554 flags |= BSTP_PDU_F_P; 555 556 if (bp->bp_agree) 557 flags |= BSTP_PDU_F_A; 558 559 if (bp->bp_tc_timer.active) 560 flags |= BSTP_PDU_F_TC; 561 562 if (bp->bp_tc_ack) 563 flags |= BSTP_PDU_F_TCA; 564 565 switch (bp->bp_state) { 566 case BSTP_IFSTATE_LEARNING: 567 flags |= BSTP_PDU_F_L; 568 break; 569 case BSTP_IFSTATE_FORWARDING: 570 flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F); 571 break; 572 } 573 574 switch (bp->bp_role) { 575 case BSTP_ROLE_ROOT: 576 flags |= (BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT); 577 break; 578 case BSTP_ROLE_ALTERNATE: 579 case BSTP_ROLE_BACKUP: 580 flags |= (BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT); 581 break; 582 case BSTP_ROLE_DESIGNATED: 583 flags |= (BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT); 584 break; 585 } 586 587 /* Strip off unused flags in either mode */ 588 switch (bp->bp_protover) { 589 case BSTP_PROTO_STP: 590 flags &= BSTP_PDU_STPMASK; 591 break; 592 case BSTP_PROTO_RSTP: 593 flags &= BSTP_PDU_RSTPMASK; 594 break; 595 } 596 return (flags); 597 } 598 599 struct mbuf * 600 bstp_input(struct bstp_state *bs, struct bstp_port *bp, 601 struct ether_header *eh, struct mbuf *m) 602 { 603 struct bstp_tbpdu tpdu; 604 u_int16_t len; 605 606 if (bs == NULL || bp == NULL || bp->bp_active == 0) 607 goto out; 608 609 len = ntohs(eh->ether_type); 610 if (len < sizeof(tpdu)) 611 goto out; 612 if (m->m_pkthdr.len > len) 613 m_adj(m, len - m->m_pkthdr.len); 614 if ((m = m_pullup(m, sizeof(tpdu))) == NULL) 615 goto out; 616 bcopy(mtod(m, struct tpdu *), &tpdu, sizeof(tpdu)); 617 618 if (tpdu.tbu_dsap != LLC_8021D_LSAP || 619 tpdu.tbu_ssap != LLC_8021D_LSAP || 620 tpdu.tbu_ctl != LLC_UI) 621 goto out; 622 if (tpdu.tbu_protoid != BSTP_PROTO_ID) 623 goto out; 624 625 /* 626 * We can treat later versions of the PDU as the same as the maximum 627 * version we implement. All additional parameters/flags are ignored. 628 */ 629 if (tpdu.tbu_protover > BSTP_PROTO_MAX) 630 tpdu.tbu_protover = BSTP_PROTO_MAX; 631 632 if (tpdu.tbu_protover != bp->bp_protover) { 633 /* 634 * Wait for the migration delay timer to expire before changing 635 * protocol version to avoid flip-flops. 636 */ 637 if (bp->bp_flags & BSTP_PORT_CANMIGRATE) 638 bstp_set_port_proto(bp, tpdu.tbu_protover); 639 else 640 goto out; 641 } 642 643 /* Clear operedge upon receiving a PDU on the port */ 644 bp->bp_operedge = 0; 645 bstp_timer_start(&bp->bp_edge_delay_timer, 646 BSTP_DEFAULT_MIGRATE_DELAY); 647 648 switch (tpdu.tbu_protover) { 649 case BSTP_PROTO_STP: 650 bstp_received_stp(bs, bp, &m, &tpdu); 651 break; 652 case BSTP_PROTO_RSTP: 653 bstp_received_rstp(bs, bp, &m, &tpdu); 654 break; 655 } 656 out: 657 if (m) 658 m_freem(m); 659 return (NULL); 660 } 661 662 void 663 bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp, 664 struct mbuf **mp, struct bstp_tbpdu *tpdu) 665 { 666 struct bstp_cbpdu cpdu; 667 struct bstp_config_unit *cu = &bp->bp_msg_cu; 668 struct bstp_tcn_unit tu; 669 670 switch (tpdu->tbu_bpdutype) { 671 case BSTP_MSGTYPE_TCN: 672 tu.tu_message_type = tpdu->tbu_bpdutype; 673 bstp_received_tcn(bs, bp, &tu); 674 break; 675 case BSTP_MSGTYPE_CFG: 676 if ((*mp)->m_len < BSTP_BPDU_STP_LEN && 677 (*mp = m_pullup(*mp, BSTP_BPDU_STP_LEN)) == NULL) 678 return; 679 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_STP_LEN); 680 681 bstp_decode_bpdu(bp, &cpdu, cu); 682 bstp_received_bpdu(bs, bp, cu); 683 break; 684 } 685 } 686 687 void 688 bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp, 689 struct mbuf **mp, struct bstp_tbpdu *tpdu) 690 { 691 struct bstp_cbpdu cpdu; 692 struct bstp_config_unit *cu = &bp->bp_msg_cu; 693 694 if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP) 695 return; 696 697 if ((*mp)->m_len < BSTP_BPDU_RSTP_LEN && 698 (*mp = m_pullup(*mp, BSTP_BPDU_RSTP_LEN)) == NULL) 699 return; 700 memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_RSTP_LEN); 701 702 bstp_decode_bpdu(bp, &cpdu, cu); 703 bstp_received_bpdu(bs, bp, cu); 704 } 705 706 void 707 bstp_received_tcn(struct bstp_state *bs, struct bstp_port *bp, 708 struct bstp_tcn_unit *tcn) 709 { 710 bp->bp_rcvdtcn = 1; 711 bstp_update_tc(bp); 712 } 713 714 void 715 bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp, 716 struct bstp_config_unit *cu) 717 { 718 int type; 719 720 /* We need to have transitioned to INFO_MINE before proceeding */ 721 switch (bp->bp_infois) { 722 case BSTP_INFO_DISABLED: 723 case BSTP_INFO_AGED: 724 return; 725 } 726 727 type = bstp_pdu_rcvtype(bp, cu); 728 729 switch (type) { 730 case BSTP_PDU_SUPERIOR: 731 bs->bs_allsynced = 0; 732 bp->bp_agreed = 0; 733 bp->bp_proposing = 0; 734 735 if (cu->cu_proposal && cu->cu_forwarding == 0) 736 bp->bp_proposed = 1; 737 if (cu->cu_topology_change) 738 bp->bp_rcvdtc = 1; 739 if (cu->cu_topology_change_ack) 740 bp->bp_rcvdtca = 1; 741 742 if (bp->bp_agree && 743 !bstp_pdu_bettersame(bp, BSTP_INFO_RECEIVED)) 744 bp->bp_agree = 0; 745 746 /* copy the received priority and timers to the port */ 747 bp->bp_port_pv = cu->cu_pv; 748 bp->bp_port_msg_age = cu->cu_message_age; 749 bp->bp_port_max_age = cu->cu_max_age; 750 bp->bp_port_fdelay = cu->cu_forward_delay; 751 bp->bp_port_htime = 752 (cu->cu_hello_time > BSTP_MIN_HELLO_TIME ? 753 cu->cu_hello_time : BSTP_MIN_HELLO_TIME); 754 755 /* set expiry for the new info */ 756 bstp_set_timer_msgage(bp); 757 758 bp->bp_infois = BSTP_INFO_RECEIVED; 759 bstp_assign_roles(bs); 760 break; 761 762 case BSTP_PDU_REPEATED: 763 if (cu->cu_proposal && cu->cu_forwarding == 0) 764 bp->bp_proposed = 1; 765 if (cu->cu_topology_change) 766 bp->bp_rcvdtc = 1; 767 if (cu->cu_topology_change_ack) 768 bp->bp_rcvdtca = 1; 769 770 /* rearm the age timer */ 771 bstp_set_timer_msgage(bp); 772 break; 773 774 case BSTP_PDU_INFERIOR: 775 if (cu->cu_learning) { 776 bp->bp_agreed = 1; 777 bp->bp_proposing = 0; 778 } 779 break; 780 781 case BSTP_PDU_INFERIORALT: 782 /* 783 * only point to point links are allowed fast 784 * transitions to forwarding. 785 */ 786 if (cu->cu_agree && bp->bp_ptp_link) { 787 bp->bp_agreed = 1; 788 bp->bp_proposing = 0; 789 } else 790 bp->bp_agreed = 0; 791 792 if (cu->cu_topology_change) 793 bp->bp_rcvdtc = 1; 794 if (cu->cu_topology_change_ack) 795 bp->bp_rcvdtca = 1; 796 break; 797 798 case BSTP_PDU_OTHER: 799 return; /* do nothing */ 800 } 801 802 /* update the state machines with the new data */ 803 bstp_update_state(bs, bp); 804 } 805 806 int 807 bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu) 808 { 809 int type; 810 811 /* default return type */ 812 type = BSTP_PDU_OTHER; 813 814 switch (cu->cu_role) { 815 case BSTP_ROLE_DESIGNATED: 816 if (bstp_info_superior(&bp->bp_port_pv, &cu->cu_pv)) 817 /* bpdu priority is superior */ 818 type = BSTP_PDU_SUPERIOR; 819 else if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) == 820 INFO_SAME) { 821 if (bp->bp_port_msg_age != cu->cu_message_age || 822 bp->bp_port_max_age != cu->cu_max_age || 823 bp->bp_port_fdelay != cu->cu_forward_delay || 824 bp->bp_port_htime != cu->cu_hello_time) 825 /* bpdu priority is equal and timers differ */ 826 type = BSTP_PDU_SUPERIOR; 827 else 828 /* bpdu is equal */ 829 type = BSTP_PDU_REPEATED; 830 } else 831 /* bpdu priority is worse */ 832 type = BSTP_PDU_INFERIOR; 833 834 break; 835 836 case BSTP_ROLE_ROOT: 837 case BSTP_ROLE_ALTERNATE: 838 case BSTP_ROLE_BACKUP: 839 if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) <= INFO_SAME) 840 /* 841 * not a designated port and priority is the same or 842 * worse 843 */ 844 type = BSTP_PDU_INFERIORALT; 845 break; 846 } 847 848 return (type); 849 } 850 851 int 852 bstp_pdu_bettersame(struct bstp_port *bp, int newinfo) 853 { 854 if (newinfo == BSTP_INFO_RECEIVED && 855 bp->bp_infois == BSTP_INFO_RECEIVED && 856 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME) 857 return (1); 858 859 if (newinfo == BSTP_INFO_MINE && 860 bp->bp_infois == BSTP_INFO_MINE && 861 bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) >= INFO_SAME) 862 return (1); 863 864 return (0); 865 } 866 867 int 868 bstp_info_cmp(struct bstp_pri_vector *pv, 869 struct bstp_pri_vector *cpv) 870 { 871 if (cpv->pv_root_id < pv->pv_root_id) 872 return (INFO_BETTER); 873 if (cpv->pv_root_id > pv->pv_root_id) 874 return (INFO_WORSE); 875 876 if (cpv->pv_cost < pv->pv_cost) 877 return (INFO_BETTER); 878 if (cpv->pv_cost > pv->pv_cost) 879 return (INFO_WORSE); 880 881 if (cpv->pv_dbridge_id < pv->pv_dbridge_id) 882 return (INFO_BETTER); 883 if (cpv->pv_dbridge_id > pv->pv_dbridge_id) 884 return (INFO_WORSE); 885 886 if (cpv->pv_dport_id < pv->pv_dport_id) 887 return (INFO_BETTER); 888 if (cpv->pv_dport_id > pv->pv_dport_id) 889 return (INFO_WORSE); 890 891 return (INFO_SAME); 892 } 893 894 /* 895 * This message priority vector is superior to the port priority vector and 896 * will replace it if, and only if, the message priority vector is better than 897 * the port priority vector, or the message has been transmitted from the same 898 * designated bridge and designated port as the port priority vector. 899 */ 900 int 901 bstp_info_superior(struct bstp_pri_vector *pv, 902 struct bstp_pri_vector *cpv) 903 { 904 if (bstp_info_cmp(pv, cpv) == INFO_BETTER || 905 (bstp_same_bridgeid(pv->pv_dbridge_id, cpv->pv_dbridge_id) && 906 (cpv->pv_dport_id & 0xfff) == (pv->pv_dport_id & 0xfff))) 907 return (1); 908 return (0); 909 } 910 911 void 912 bstp_assign_roles(struct bstp_state *bs) 913 { 914 struct bstp_port *bp, *rbp = NULL; 915 struct bstp_pri_vector pv; 916 917 /* default to our priority vector */ 918 bs->bs_root_pv = bs->bs_bridge_pv; 919 bs->bs_root_msg_age = 0; 920 bs->bs_root_max_age = bs->bs_bridge_max_age; 921 bs->bs_root_fdelay = bs->bs_bridge_fdelay; 922 bs->bs_root_htime = bs->bs_bridge_htime; 923 bs->bs_root_port = NULL; 924 925 /* check if any received info supersedes us */ 926 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 927 if (bp->bp_infois != BSTP_INFO_RECEIVED) 928 continue; 929 930 pv = bp->bp_port_pv; 931 pv.pv_cost += bp->bp_path_cost; 932 933 /* 934 * The root priority vector is the best of the set comprising 935 * the bridge priority vector plus all root path priority 936 * vectors whose bridge address is not equal to us. 937 */ 938 if (bstp_same_bridgeid(pv.pv_dbridge_id, 939 bs->bs_bridge_pv.pv_dbridge_id) == 0 && 940 bstp_info_cmp(&bs->bs_root_pv, &pv) == INFO_BETTER) { 941 /* the port vector replaces the root */ 942 bs->bs_root_pv = pv; 943 bs->bs_root_msg_age = bp->bp_port_msg_age + 944 BSTP_MESSAGE_AGE_INCR; 945 bs->bs_root_max_age = bp->bp_port_max_age; 946 bs->bs_root_fdelay = bp->bp_port_fdelay; 947 bs->bs_root_htime = bp->bp_port_htime; 948 rbp = bp; 949 } 950 } 951 952 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 953 /* calculate the port designated vector */ 954 bp->bp_desg_pv.pv_root_id = bs->bs_root_pv.pv_root_id; 955 bp->bp_desg_pv.pv_cost = bs->bs_root_pv.pv_cost; 956 bp->bp_desg_pv.pv_dbridge_id = bs->bs_bridge_pv.pv_dbridge_id; 957 bp->bp_desg_pv.pv_dport_id = bp->bp_port_id; 958 bp->bp_desg_pv.pv_port_id = bp->bp_port_id; 959 960 /* calculate designated times */ 961 bp->bp_desg_msg_age = bs->bs_root_msg_age; 962 bp->bp_desg_max_age = bs->bs_root_max_age; 963 bp->bp_desg_fdelay = bs->bs_root_fdelay; 964 bp->bp_desg_htime = bs->bs_bridge_htime; 965 966 967 switch (bp->bp_infois) { 968 case BSTP_INFO_DISABLED: 969 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 970 break; 971 972 case BSTP_INFO_AGED: 973 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 974 bstp_update_info(bp); 975 break; 976 977 case BSTP_INFO_MINE: 978 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 979 /* update the port info if stale */ 980 if (bstp_info_cmp(&bp->bp_port_pv, 981 &bp->bp_desg_pv) != INFO_SAME || 982 (rbp != NULL && 983 (bp->bp_port_msg_age != rbp->bp_port_msg_age || 984 bp->bp_port_max_age != rbp->bp_port_max_age || 985 bp->bp_port_fdelay != rbp->bp_port_fdelay || 986 bp->bp_port_htime != rbp->bp_port_htime))) 987 bstp_update_info(bp); 988 break; 989 990 case BSTP_INFO_RECEIVED: 991 if (bp == rbp) { 992 /* 993 * root priority is derived from this 994 * port, make it the root port. 995 */ 996 bstp_set_port_role(bp, BSTP_ROLE_ROOT); 997 bs->bs_root_port = bp; 998 } else if (bstp_info_cmp(&bp->bp_port_pv, 999 &bp->bp_desg_pv) == INFO_BETTER) { 1000 /* 1001 * the port priority is lower than the root 1002 * port. 1003 */ 1004 bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); 1005 bstp_update_info(bp); 1006 } else { 1007 if (bstp_same_bridgeid( 1008 bp->bp_port_pv.pv_dbridge_id, 1009 bs->bs_bridge_pv.pv_dbridge_id)) { 1010 /* 1011 * the designated bridge refers to 1012 * another port on this bridge. 1013 */ 1014 bstp_set_port_role(bp, 1015 BSTP_ROLE_BACKUP); 1016 } else { 1017 /* 1018 * the port is an inferior path to the 1019 * root bridge. 1020 */ 1021 bstp_set_port_role(bp, 1022 BSTP_ROLE_ALTERNATE); 1023 } 1024 } 1025 break; 1026 } 1027 } 1028 } 1029 1030 void 1031 bstp_update_state(struct bstp_state *bs, struct bstp_port *bp) 1032 { 1033 struct bstp_port *bp2; 1034 int synced; 1035 1036 /* check if all the ports have synchronized again */ 1037 if (!bs->bs_allsynced) { 1038 synced = 1; 1039 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1040 if (!(bp2->bp_synced || 1041 bp2->bp_role == BSTP_ROLE_ROOT)) { 1042 synced = 0; 1043 break; 1044 } 1045 } 1046 bs->bs_allsynced = synced; 1047 } 1048 1049 bstp_update_roles(bs, bp); 1050 bstp_update_tc(bp); 1051 } 1052 1053 void 1054 bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp) 1055 { 1056 switch (bp->bp_role) { 1057 case BSTP_ROLE_DISABLED: 1058 /* Clear any flags if set */ 1059 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 1060 bp->bp_sync = 0; 1061 bp->bp_synced = 1; 1062 bp->bp_reroot = 0; 1063 } 1064 break; 1065 1066 case BSTP_ROLE_ALTERNATE: 1067 case BSTP_ROLE_BACKUP: 1068 if ((bs->bs_allsynced && !bp->bp_agree) || 1069 (bp->bp_proposed && bp->bp_agree)) { 1070 bp->bp_proposed = 0; 1071 bp->bp_agree = 1; 1072 bp->bp_flags |= BSTP_PORT_NEWINFO; 1073 DPRINTF("%s -> ALTERNATE_AGREED\n", 1074 bp->bp_ifp->if_xname); 1075 } 1076 1077 if (bp->bp_proposed && !bp->bp_agree) { 1078 bstp_set_all_sync(bs); 1079 bp->bp_proposed = 0; 1080 DPRINTF("%s -> ALTERNATE_PROPOSED\n", 1081 bp->bp_ifp->if_xname); 1082 } 1083 1084 /* Clear any flags if set */ 1085 if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { 1086 bp->bp_sync = 0; 1087 bp->bp_synced = 1; 1088 bp->bp_reroot = 0; 1089 DPRINTF("%s -> ALTERNATE_PORT\n", bp->bp_ifp->if_xname); 1090 } 1091 break; 1092 1093 case BSTP_ROLE_ROOT: 1094 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) { 1095 bstp_set_all_reroot(bs); 1096 DPRINTF("%s -> ROOT_REROOT\n", bp->bp_ifp->if_xname); 1097 } 1098 1099 if ((bs->bs_allsynced && !bp->bp_agree) || 1100 (bp->bp_proposed && bp->bp_agree)) { 1101 bp->bp_proposed = 0; 1102 bp->bp_sync = 0; 1103 bp->bp_agree = 1; 1104 bp->bp_flags |= BSTP_PORT_NEWINFO; 1105 DPRINTF("%s -> ROOT_AGREED\n", bp->bp_ifp->if_xname); 1106 } 1107 1108 if (bp->bp_proposed && !bp->bp_agree) { 1109 bstp_set_all_sync(bs); 1110 bp->bp_proposed = 0; 1111 DPRINTF("%s -> ROOT_PROPOSED\n", bp->bp_ifp->if_xname); 1112 } 1113 1114 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1115 (bp->bp_forward_delay_timer.active == 0 || 1116 (bstp_rerooted(bs, bp) && 1117 bp->bp_recent_backup_timer.active == 0 && 1118 bp->bp_protover == BSTP_PROTO_RSTP))) { 1119 switch (bp->bp_state) { 1120 case BSTP_IFSTATE_DISCARDING: 1121 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 1122 break; 1123 case BSTP_IFSTATE_LEARNING: 1124 bstp_set_port_state(bp, 1125 BSTP_IFSTATE_FORWARDING); 1126 break; 1127 } 1128 } 1129 1130 if (bp->bp_state == BSTP_IFSTATE_FORWARDING && bp->bp_reroot) { 1131 bp->bp_reroot = 0; 1132 DPRINTF("%s -> ROOT_REROOTED\n", bp->bp_ifp->if_xname); 1133 } 1134 break; 1135 1136 case BSTP_ROLE_DESIGNATED: 1137 if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) { 1138 bp->bp_reroot = 0; 1139 DPRINTF("%s -> DESIGNATED_RETIRED\n", 1140 bp->bp_ifp->if_xname); 1141 } 1142 1143 if ((bp->bp_state == BSTP_IFSTATE_DISCARDING && 1144 !bp->bp_synced) || (bp->bp_agreed && !bp->bp_synced) || 1145 (bp->bp_operedge && !bp->bp_synced) || 1146 (bp->bp_sync && bp->bp_synced)) { 1147 bstp_timer_stop(&bp->bp_recent_root_timer); 1148 bp->bp_synced = 1; 1149 bp->bp_sync = 0; 1150 DPRINTF("%s -> DESIGNATED_SYNCED\n", 1151 bp->bp_ifp->if_xname); 1152 } 1153 1154 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1155 !bp->bp_agreed && !bp->bp_proposing && 1156 !bp->bp_operedge) { 1157 bp->bp_proposing = 1; 1158 bp->bp_flags |= BSTP_PORT_NEWINFO; 1159 bstp_timer_start(&bp->bp_edge_delay_timer, 1160 (bp->bp_ptp_link ? BSTP_DEFAULT_MIGRATE_DELAY : 1161 bp->bp_desg_max_age)); 1162 DPRINTF("%s -> DESIGNATED_PROPOSE\n", 1163 bp->bp_ifp->if_xname); 1164 } 1165 1166 if (bp->bp_state != BSTP_IFSTATE_FORWARDING && 1167 (bp->bp_forward_delay_timer.active == 0 || bp->bp_agreed || 1168 bp->bp_operedge) && 1169 (bp->bp_recent_root_timer.active == 0 || !bp->bp_reroot) && 1170 !bp->bp_sync) { 1171 if (bp->bp_agreed) 1172 DPRINTF("%s -> AGREED\n", bp->bp_ifp->if_xname); 1173 /* 1174 * If agreed|operedge then go straight to forwarding, 1175 * otherwise follow discard -> learn -> forward. 1176 */ 1177 if (bp->bp_agreed || bp->bp_operedge || 1178 bp->bp_state == BSTP_IFSTATE_LEARNING) { 1179 bstp_set_port_state(bp, 1180 BSTP_IFSTATE_FORWARDING); 1181 bp->bp_agreed = bp->bp_protover; 1182 } else if (bp->bp_state == BSTP_IFSTATE_DISCARDING) 1183 bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); 1184 } 1185 1186 if (((bp->bp_sync && !bp->bp_synced) || 1187 (bp->bp_reroot && bp->bp_recent_root_timer.active) || 1188 (bp->bp_flags & BSTP_PORT_DISPUTED)) && !bp->bp_operedge && 1189 bp->bp_state != BSTP_IFSTATE_DISCARDING) { 1190 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1191 bp->bp_flags &= ~BSTP_PORT_DISPUTED; 1192 bstp_timer_start(&bp->bp_forward_delay_timer, 1193 bp->bp_protover == BSTP_PROTO_RSTP ? 1194 bp->bp_desg_htime : bp->bp_desg_fdelay); 1195 DPRINTF("%s -> DESIGNATED_DISCARD\n", 1196 bp->bp_ifp->if_xname); 1197 } 1198 break; 1199 } 1200 1201 if (bp->bp_flags & BSTP_PORT_NEWINFO) 1202 bstp_transmit(bs, bp); 1203 } 1204 1205 void 1206 bstp_update_tc(struct bstp_port *bp) 1207 { 1208 switch (bp->bp_tcstate) { 1209 case BSTP_TCSTATE_ACTIVE: 1210 if ((bp->bp_role != BSTP_ROLE_DESIGNATED && 1211 bp->bp_role != BSTP_ROLE_ROOT) || bp->bp_operedge) 1212 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1213 1214 if (bp->bp_rcvdtcn) 1215 bstp_set_port_tc(bp, BSTP_TCSTATE_TCN); 1216 if (bp->bp_rcvdtc) 1217 bstp_set_port_tc(bp, BSTP_TCSTATE_TC); 1218 1219 if (bp->bp_tc_prop && !bp->bp_operedge) 1220 bstp_set_port_tc(bp, BSTP_TCSTATE_PROPAG); 1221 1222 if (bp->bp_rcvdtca) 1223 bstp_set_port_tc(bp, BSTP_TCSTATE_ACK); 1224 break; 1225 1226 case BSTP_TCSTATE_INACTIVE: 1227 if ((bp->bp_state == BSTP_IFSTATE_LEARNING || 1228 bp->bp_state == BSTP_IFSTATE_FORWARDING) && 1229 bp->bp_fdbflush == 0) 1230 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1231 break; 1232 1233 case BSTP_TCSTATE_LEARNING: 1234 if (bp->bp_rcvdtc || bp->bp_rcvdtcn || bp->bp_rcvdtca || 1235 bp->bp_tc_prop) 1236 bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); 1237 else if (bp->bp_role != BSTP_ROLE_DESIGNATED && 1238 bp->bp_role != BSTP_ROLE_ROOT && 1239 bp->bp_state == BSTP_IFSTATE_DISCARDING) 1240 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 1241 1242 if ((bp->bp_role == BSTP_ROLE_DESIGNATED || 1243 bp->bp_role == BSTP_ROLE_ROOT) && 1244 bp->bp_state == BSTP_IFSTATE_FORWARDING && 1245 !bp->bp_operedge) 1246 bstp_set_port_tc(bp, BSTP_TCSTATE_DETECTED); 1247 break; 1248 1249 /* these are transient states and go straight back to ACTIVE */ 1250 case BSTP_TCSTATE_DETECTED: 1251 case BSTP_TCSTATE_TCN: 1252 case BSTP_TCSTATE_TC: 1253 case BSTP_TCSTATE_PROPAG: 1254 case BSTP_TCSTATE_ACK: 1255 DPRINTF("Invalid TC state for %s\n", 1256 bp->bp_ifp->if_xname); 1257 break; 1258 } 1259 1260 } 1261 1262 void 1263 bstp_update_info(struct bstp_port *bp) 1264 { 1265 struct bstp_state *bs = bp->bp_bs; 1266 1267 bp->bp_proposing = 0; 1268 bp->bp_proposed = 0; 1269 1270 if (bp->bp_agreed && !bstp_pdu_bettersame(bp, BSTP_INFO_MINE)) 1271 bp->bp_agreed = 0; 1272 1273 if (bp->bp_synced && !bp->bp_agreed) { 1274 bp->bp_synced = 0; 1275 bs->bs_allsynced = 0; 1276 } 1277 1278 /* copy the designated pv to the port */ 1279 bp->bp_port_pv = bp->bp_desg_pv; 1280 bp->bp_port_msg_age = bp->bp_desg_msg_age; 1281 bp->bp_port_max_age = bp->bp_desg_max_age; 1282 bp->bp_port_fdelay = bp->bp_desg_fdelay; 1283 bp->bp_port_htime = bp->bp_desg_htime; 1284 bp->bp_infois = BSTP_INFO_MINE; 1285 1286 /* Set transmit flag but do not immediately send */ 1287 bp->bp_flags |= BSTP_PORT_NEWINFO; 1288 } 1289 1290 /* set tcprop on every port other than the caller */ 1291 void 1292 bstp_set_other_tcprop(struct bstp_port *bp) 1293 { 1294 struct bstp_state *bs = bp->bp_bs; 1295 struct bstp_port *bp2; 1296 1297 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1298 if (bp2 == bp) 1299 continue; 1300 bp2->bp_tc_prop = 1; 1301 } 1302 } 1303 1304 void 1305 bstp_set_all_reroot(struct bstp_state *bs) 1306 { 1307 struct bstp_port *bp; 1308 1309 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1310 bp->bp_reroot = 1; 1311 } 1312 1313 void 1314 bstp_set_all_sync(struct bstp_state *bs) 1315 { 1316 struct bstp_port *bp; 1317 1318 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1319 bp->bp_sync = 1; 1320 bp->bp_synced = 0; /* Not explicit in spec */ 1321 } 1322 1323 bs->bs_allsynced = 0; 1324 } 1325 1326 void 1327 bstp_set_port_state(struct bstp_port *bp, int state) 1328 { 1329 if (bp->bp_state == state) 1330 return; 1331 1332 bp->bp_state = state; 1333 1334 switch (bp->bp_state) { 1335 case BSTP_IFSTATE_DISCARDING: 1336 DPRINTF("state changed to DISCARDING on %s\n", 1337 bp->bp_ifp->if_xname); 1338 break; 1339 1340 case BSTP_IFSTATE_LEARNING: 1341 DPRINTF("state changed to LEARNING on %s\n", 1342 bp->bp_ifp->if_xname); 1343 1344 bstp_timer_start(&bp->bp_forward_delay_timer, 1345 bp->bp_protover == BSTP_PROTO_RSTP ? 1346 bp->bp_desg_htime : bp->bp_desg_fdelay); 1347 break; 1348 1349 case BSTP_IFSTATE_FORWARDING: 1350 DPRINTF("state changed to FORWARDING on %s\n", 1351 bp->bp_ifp->if_xname); 1352 1353 bstp_timer_stop(&bp->bp_forward_delay_timer); 1354 /* Record that we enabled forwarding */ 1355 bp->bp_forward_transitions++; 1356 break; 1357 } 1358 } 1359 1360 void 1361 bstp_set_port_role(struct bstp_port *bp, int role) 1362 { 1363 struct bstp_state *bs = bp->bp_bs; 1364 1365 if (bp->bp_role == role) 1366 return; 1367 1368 /* perform pre-change tasks */ 1369 switch (bp->bp_role) { 1370 case BSTP_ROLE_DISABLED: 1371 bstp_timer_start(&bp->bp_forward_delay_timer, 1372 bp->bp_desg_max_age); 1373 break; 1374 1375 case BSTP_ROLE_BACKUP: 1376 bstp_timer_start(&bp->bp_recent_backup_timer, 1377 bp->bp_desg_htime * 2); 1378 /* FALLTHROUGH */ 1379 case BSTP_ROLE_ALTERNATE: 1380 bstp_timer_start(&bp->bp_forward_delay_timer, 1381 bp->bp_desg_fdelay); 1382 bp->bp_sync = 0; 1383 bp->bp_synced = 1; 1384 bp->bp_reroot = 0; 1385 break; 1386 1387 case BSTP_ROLE_ROOT: 1388 bstp_timer_start(&bp->bp_recent_root_timer, 1389 BSTP_DEFAULT_FORWARD_DELAY); 1390 break; 1391 } 1392 1393 bp->bp_role = role; 1394 /* clear values not carried between roles */ 1395 bp->bp_proposing = 0; 1396 bs->bs_allsynced = 0; 1397 1398 /* initialise the new role */ 1399 switch (bp->bp_role) { 1400 case BSTP_ROLE_DISABLED: 1401 case BSTP_ROLE_ALTERNATE: 1402 case BSTP_ROLE_BACKUP: 1403 DPRINTF("%s role -> ALT/BACK/DISABLED\n", 1404 bp->bp_ifp->if_xname); 1405 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1406 bstp_timer_stop(&bp->bp_recent_root_timer); 1407 bstp_timer_latch(&bp->bp_forward_delay_timer); 1408 bp->bp_sync = 0; 1409 bp->bp_synced = 1; 1410 bp->bp_reroot = 0; 1411 break; 1412 1413 case BSTP_ROLE_ROOT: 1414 DPRINTF("%s role -> ROOT\n", 1415 bp->bp_ifp->if_xname); 1416 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1417 bstp_timer_latch(&bp->bp_recent_root_timer); 1418 bp->bp_proposing = 0; 1419 break; 1420 1421 case BSTP_ROLE_DESIGNATED: 1422 DPRINTF("%s role -> DESIGNATED\n", 1423 bp->bp_ifp->if_xname); 1424 bstp_timer_start(&bp->bp_hello_timer, 1425 bp->bp_desg_htime); 1426 bp->bp_agree = 0; 1427 break; 1428 } 1429 1430 /* let the TC state know that the role changed */ 1431 bstp_update_tc(bp); 1432 } 1433 1434 void 1435 bstp_set_port_proto(struct bstp_port *bp, int proto) 1436 { 1437 struct bstp_state *bs = bp->bp_bs; 1438 1439 /* supported protocol versions */ 1440 switch (proto) { 1441 case BSTP_PROTO_STP: 1442 /* we can downgrade protocols only */ 1443 bstp_timer_stop(&bp->bp_migrate_delay_timer); 1444 /* clear unsupported features */ 1445 bp->bp_operedge = 0; 1446 break; 1447 1448 case BSTP_PROTO_RSTP: 1449 bstp_timer_start(&bp->bp_migrate_delay_timer, 1450 bs->bs_migration_delay); 1451 break; 1452 1453 default: 1454 DPRINTF("Unsupported STP version %d\n", proto); 1455 return; 1456 } 1457 1458 bp->bp_protover = proto; 1459 bp->bp_flags &= ~BSTP_PORT_CANMIGRATE; 1460 } 1461 1462 void 1463 bstp_set_port_tc(struct bstp_port *bp, int state) 1464 { 1465 struct bstp_state *bs = bp->bp_bs; 1466 1467 bp->bp_tcstate = state; 1468 1469 /* initialise the new state */ 1470 switch (bp->bp_tcstate) { 1471 case BSTP_TCSTATE_ACTIVE: 1472 DPRINTF("%s -> TC_ACTIVE\n", bp->bp_ifp->if_xname); 1473 /* nothing to do */ 1474 break; 1475 1476 case BSTP_TCSTATE_INACTIVE: 1477 bstp_timer_stop(&bp->bp_tc_timer); 1478 /* flush routes on the parent bridge */ 1479 bp->bp_fdbflush = 1; 1480 bstp_notify_rtage(bp->bp_ifp, 0); 1481 bp->bp_tc_ack = 0; 1482 DPRINTF("%s -> TC_INACTIVE\n", bp->bp_ifp->if_xname); 1483 break; 1484 1485 case BSTP_TCSTATE_LEARNING: 1486 bp->bp_rcvdtc = 0; 1487 bp->bp_rcvdtcn = 0; 1488 bp->bp_rcvdtca = 0; 1489 bp->bp_tc_prop = 0; 1490 DPRINTF("%s -> TC_LEARNING\n", bp->bp_ifp->if_xname); 1491 break; 1492 1493 case BSTP_TCSTATE_DETECTED: 1494 bstp_set_timer_tc(bp); 1495 bstp_set_other_tcprop(bp); 1496 /* send out notification */ 1497 bp->bp_flags |= BSTP_PORT_NEWINFO; 1498 bstp_transmit(bs, bp); 1499 getmicrotime(&bs->bs_last_tc_time); 1500 DPRINTF("%s -> TC_DETECTED\n", bp->bp_ifp->if_xname); 1501 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1502 break; 1503 1504 case BSTP_TCSTATE_TCN: 1505 bstp_set_timer_tc(bp); 1506 DPRINTF("%s -> TC_TCN\n", bp->bp_ifp->if_xname); 1507 /* FALLTHROUGH */ 1508 case BSTP_TCSTATE_TC: 1509 bp->bp_rcvdtc = 0; 1510 bp->bp_rcvdtcn = 0; 1511 if (bp->bp_role == BSTP_ROLE_DESIGNATED) 1512 bp->bp_tc_ack = 1; 1513 1514 bstp_set_other_tcprop(bp); 1515 DPRINTF("%s -> TC_TC\n", bp->bp_ifp->if_xname); 1516 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1517 break; 1518 1519 case BSTP_TCSTATE_PROPAG: 1520 /* flush routes on the parent bridge */ 1521 bp->bp_fdbflush = 1; 1522 bstp_notify_rtage(bp->bp_ifp, 0); 1523 bp->bp_tc_prop = 0; 1524 bstp_set_timer_tc(bp); 1525 DPRINTF("%s -> TC_PROPAG\n", bp->bp_ifp->if_xname); 1526 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1527 break; 1528 1529 case BSTP_TCSTATE_ACK: 1530 bstp_timer_stop(&bp->bp_tc_timer); 1531 bp->bp_rcvdtca = 0; 1532 DPRINTF("%s -> TC_ACK\n", bp->bp_ifp->if_xname); 1533 bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ 1534 break; 1535 } 1536 } 1537 1538 void 1539 bstp_set_timer_tc(struct bstp_port *bp) 1540 { 1541 struct bstp_state *bs = bp->bp_bs; 1542 1543 if (bp->bp_tc_timer.active) 1544 return; 1545 1546 switch (bp->bp_protover) { 1547 case BSTP_PROTO_RSTP: 1548 bstp_timer_start(&bp->bp_tc_timer, 1549 bp->bp_desg_htime + BSTP_TICK_VAL); 1550 bp->bp_flags |= BSTP_PORT_NEWINFO; 1551 break; 1552 case BSTP_PROTO_STP: 1553 bstp_timer_start(&bp->bp_tc_timer, 1554 bs->bs_root_max_age + bs->bs_root_fdelay); 1555 break; 1556 } 1557 } 1558 1559 void 1560 bstp_set_timer_msgage(struct bstp_port *bp) 1561 { 1562 if (bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR <= 1563 bp->bp_port_max_age) { 1564 bstp_timer_start(&bp->bp_message_age_timer, 1565 bp->bp_port_htime * 3); 1566 } else 1567 /* expires immediately */ 1568 bstp_timer_start(&bp->bp_message_age_timer, 0); 1569 } 1570 1571 int 1572 bstp_rerooted(struct bstp_state *bs, struct bstp_port *bp) 1573 { 1574 struct bstp_port *bp2; 1575 int rr_set = 0; 1576 1577 LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { 1578 if (bp2 == bp) 1579 continue; 1580 if (bp2->bp_recent_root_timer.active) { 1581 rr_set = 1; 1582 break; 1583 } 1584 } 1585 return (!rr_set); 1586 } 1587 1588 /* 1589 * Calculate the path cost according to the link speed. 1590 */ 1591 u_int32_t 1592 bstp_calc_path_cost(struct bstp_port *bp) 1593 { 1594 struct ifnet *ifp = bp->bp_ifp; 1595 u_int32_t path_cost; 1596 1597 /* If the priority has been manually set then retain the value */ 1598 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1599 return bp->bp_path_cost; 1600 1601 if (ifp->if_baudrate < 1000) 1602 return (BSTP_DEFAULT_PATH_COST); 1603 1604 /* formula from section 17.14, IEEE Std 802.1D-2004 */ 1605 path_cost = 20000000000ULL / (ifp->if_baudrate / 1000); 1606 1607 if (path_cost > BSTP_MAX_PATH_COST) 1608 path_cost = BSTP_MAX_PATH_COST; 1609 1610 /* STP compat mode only uses 16 bits of the 32 */ 1611 if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) 1612 path_cost = 65535; 1613 1614 return (path_cost); 1615 } 1616 1617 void 1618 bstp_notify_rtage(void *arg, int pending) 1619 { 1620 struct bstp_port *bp = (struct bstp_port *)arg; 1621 int age = 0; 1622 1623 splassert(IPL_NET); 1624 1625 switch (bp->bp_protover) { 1626 case BSTP_PROTO_STP: 1627 /* convert to seconds */ 1628 age = bp->bp_desg_fdelay / BSTP_TICK_VAL; 1629 break; 1630 case BSTP_PROTO_RSTP: 1631 age = 0; 1632 break; 1633 } 1634 1635 if (bp->bp_active == 1) 1636 bridge_rtagenode(bp->bp_ifp, age); 1637 1638 /* flush is complete */ 1639 bp->bp_fdbflush = 0; 1640 } 1641 1642 void 1643 bstp_ifstate(void *arg) 1644 { 1645 struct ifnet *ifp = (struct ifnet *)arg; 1646 struct bridge_softc *sc; 1647 struct bridge_iflist *p; 1648 struct bstp_port *bp; 1649 struct bstp_state *bs; 1650 int s; 1651 1652 if (ifp->if_type == IFT_BRIDGE) 1653 return; 1654 sc = (struct bridge_softc *)ifp->if_bridge; 1655 1656 s = splnet(); 1657 LIST_FOREACH(p, &sc->sc_iflist, next) { 1658 if ((p->bif_flags & IFBIF_STP) == 0) 1659 continue; 1660 if (p->ifp == ifp) 1661 break; 1662 } 1663 if (p == LIST_END(&sc->sc_iflist)) 1664 goto done; 1665 if ((bp = p->bif_stp) == NULL) 1666 goto done; 1667 if ((bs = bp->bp_bs) == NULL) 1668 goto done; 1669 1670 /* update the link state */ 1671 bstp_ifupdstatus(bs, bp); 1672 bstp_update_state(bs, bp); 1673 done: 1674 splx(s); 1675 } 1676 1677 void 1678 bstp_ifupdstatus(struct bstp_state *bs, struct bstp_port *bp) 1679 { 1680 struct ifnet *ifp = bp->bp_ifp; 1681 1682 if (ifp == NULL) 1683 return; 1684 1685 bp->bp_path_cost = bstp_calc_path_cost(bp); 1686 1687 if ((ifp->if_flags & IFF_UP) && 1688 ifp->if_link_state != LINK_STATE_DOWN) { 1689 if (bp->bp_flags & BSTP_PORT_AUTOPTP) { 1690 /* A full-duplex link is assumed to be ptp */ 1691 bp->bp_ptp_link = ifp->if_link_state == 1692 LINK_STATE_FULL_DUPLEX ? 1 : 0; 1693 } 1694 1695 if (bp->bp_infois == BSTP_INFO_DISABLED) 1696 bstp_enable_port(bs, bp); 1697 } else { 1698 if (bp->bp_infois != BSTP_INFO_DISABLED) 1699 bstp_disable_port(bs, bp); 1700 } 1701 } 1702 1703 void 1704 bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp) 1705 { 1706 bp->bp_infois = BSTP_INFO_AGED; 1707 bstp_assign_roles(bs); 1708 } 1709 1710 void 1711 bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp) 1712 { 1713 bp->bp_infois = BSTP_INFO_DISABLED; 1714 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1715 bstp_assign_roles(bs); 1716 } 1717 1718 void 1719 bstp_tick(void *arg) 1720 { 1721 struct bstp_state *bs = (struct bstp_state *)arg; 1722 struct bstp_port *bp; 1723 int s; 1724 1725 s = splnet(); 1726 if ((bs->bs_ifflags & IFF_RUNNING) == 0) { 1727 splx(s); 1728 return; 1729 } 1730 1731 /* slow timer to catch missed link events */ 1732 if (bstp_timer_expired(&bs->bs_link_timer)) { 1733 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1734 bstp_ifupdstatus(bs, bp); 1735 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 1736 } 1737 1738 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1739 /* no events need to happen for these */ 1740 bstp_timer_expired(&bp->bp_tc_timer); 1741 bstp_timer_expired(&bp->bp_recent_root_timer); 1742 bstp_timer_expired(&bp->bp_forward_delay_timer); 1743 bstp_timer_expired(&bp->bp_recent_backup_timer); 1744 1745 if (bstp_timer_expired(&bp->bp_hello_timer)) 1746 bstp_hello_timer_expiry(bs, bp); 1747 1748 if (bstp_timer_expired(&bp->bp_message_age_timer)) 1749 bstp_message_age_expiry(bs, bp); 1750 1751 if (bstp_timer_expired(&bp->bp_migrate_delay_timer)) 1752 bstp_migrate_delay_expiry(bs, bp); 1753 1754 if (bstp_timer_expired(&bp->bp_edge_delay_timer)) 1755 bstp_edge_delay_expiry(bs, bp); 1756 1757 /* update the various state machines for the port */ 1758 bstp_update_state(bs, bp); 1759 1760 if (bp->bp_txcount > 0) 1761 bp->bp_txcount--; 1762 } 1763 1764 if (bs->bs_ifp->if_flags & IFF_RUNNING) 1765 timeout_add_sec(&bs->bs_bstptimeout, 1); 1766 1767 splx(s); 1768 } 1769 1770 void 1771 bstp_timer_start(struct bstp_timer *t, u_int16_t v) 1772 { 1773 t->value = v; 1774 t->active = 1; 1775 t->latched = 0; 1776 } 1777 1778 void 1779 bstp_timer_stop(struct bstp_timer *t) 1780 { 1781 t->value = 0; 1782 t->active = 0; 1783 t->latched = 0; 1784 } 1785 1786 void 1787 bstp_timer_latch(struct bstp_timer *t) 1788 { 1789 t->latched = 1; 1790 t->active = 1; 1791 } 1792 1793 int 1794 bstp_timer_expired(struct bstp_timer *t) 1795 { 1796 if (t->active == 0 || t->latched) 1797 return (0); 1798 t->value -= BSTP_TICK_VAL; 1799 if (t->value <= 0) { 1800 bstp_timer_stop(t); 1801 return (1); 1802 } 1803 return (0); 1804 } 1805 1806 void 1807 bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp) 1808 { 1809 if ((bp->bp_flags & BSTP_PORT_NEWINFO) || 1810 bp->bp_role == BSTP_ROLE_DESIGNATED || 1811 (bp->bp_role == BSTP_ROLE_ROOT && 1812 bp->bp_tc_timer.active == 1)) { 1813 bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); 1814 bp->bp_flags |= BSTP_PORT_NEWINFO; 1815 bstp_transmit(bs, bp); 1816 } 1817 } 1818 1819 void 1820 bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp) 1821 { 1822 if (bp->bp_infois == BSTP_INFO_RECEIVED) { 1823 bp->bp_infois = BSTP_INFO_AGED; 1824 bstp_assign_roles(bs); 1825 DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname); 1826 } 1827 } 1828 1829 void 1830 bstp_migrate_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 1831 { 1832 bp->bp_flags |= BSTP_PORT_CANMIGRATE; 1833 } 1834 1835 void 1836 bstp_edge_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) 1837 { 1838 if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) && 1839 bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing && 1840 bp->bp_role == BSTP_ROLE_DESIGNATED) 1841 bp->bp_operedge = 1; 1842 } 1843 1844 int 1845 bstp_addr_cmp(const u_int8_t *a, const u_int8_t *b) 1846 { 1847 int i, d; 1848 1849 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 1850 d = ((int)a[i]) - ((int)b[i]); 1851 } 1852 1853 return (d); 1854 } 1855 1856 /* 1857 * compare the bridge address component of the bridgeid 1858 */ 1859 int 1860 bstp_same_bridgeid(u_int64_t id1, u_int64_t id2) 1861 { 1862 u_char addr1[ETHER_ADDR_LEN]; 1863 u_char addr2[ETHER_ADDR_LEN]; 1864 1865 PV2ADDR(id1, addr1); 1866 PV2ADDR(id2, addr2); 1867 1868 if (bstp_addr_cmp(addr1, addr2) == 0) 1869 return (1); 1870 1871 return (0); 1872 } 1873 1874 void 1875 bstp_initialization(struct bstp_state *bs) 1876 { 1877 struct bstp_port *bp; 1878 struct ifnet *mif = NULL; 1879 u_char *e_addr; 1880 1881 if (LIST_EMPTY(&bs->bs_bplist)) { 1882 bstp_stop(bs); 1883 return; 1884 } 1885 1886 /* 1887 * Search through the Ethernet interfaces and find the one 1888 * with the lowest value. 1889 * Make sure we take the address from an interface that is 1890 * part of the bridge to make sure two bridges on the system 1891 * will not use the same one. It is not possible for mif to be 1892 * null, at this point we have at least one STP port and hence 1893 * at least one NIC. 1894 */ 1895 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1896 if (mif == NULL) { 1897 mif = bp->bp_ifp; 1898 continue; 1899 } 1900 if (bstp_addr_cmp(LLADDR(bp->bp_ifp->if_sadl), 1901 LLADDR(mif->if_sadl)) < 0) { 1902 mif = bp->bp_ifp; 1903 continue; 1904 } 1905 } 1906 1907 e_addr = LLADDR(mif->if_sadl); 1908 bs->bs_bridge_pv.pv_dbridge_id = 1909 (((u_int64_t)bs->bs_bridge_priority) << 48) | 1910 (((u_int64_t)e_addr[0]) << 40) | 1911 (((u_int64_t)e_addr[1]) << 32) | 1912 (((u_int64_t)e_addr[2]) << 24) | 1913 (((u_int64_t)e_addr[3]) << 16) | 1914 (((u_int64_t)e_addr[4]) << 8) | 1915 (((u_int64_t)e_addr[5])); 1916 1917 bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; 1918 bs->bs_bridge_pv.pv_cost = 0; 1919 bs->bs_bridge_pv.pv_dport_id = 0; 1920 bs->bs_bridge_pv.pv_port_id = 0; 1921 1922 if (!timeout_initialized(&bs->bs_bstptimeout)) 1923 timeout_set(&bs->bs_bstptimeout, bstp_tick, bs); 1924 if (bs->bs_ifflags & IFF_RUNNING && 1925 !timeout_pending(&bs->bs_bstptimeout)) 1926 timeout_add_sec(&bs->bs_bstptimeout, 1); 1927 1928 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 1929 bp->bp_port_id = (bp->bp_priority << 8) | 1930 (bp->bp_ifp->if_index & 0xfff); 1931 bstp_ifupdstatus(bs, bp); 1932 } 1933 1934 bstp_assign_roles(bs); 1935 bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); 1936 } 1937 1938 struct bstp_state * 1939 bstp_create(struct ifnet *ifp) 1940 { 1941 struct bstp_state *bs; 1942 int s; 1943 1944 s = splnet(); 1945 bs = malloc(sizeof(*bs), M_DEVBUF, M_WAITOK|M_ZERO); 1946 LIST_INIT(&bs->bs_bplist); 1947 1948 bs->bs_ifp = ifp; 1949 bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 1950 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 1951 bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY; 1952 bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 1953 bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME; 1954 bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY; 1955 bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT; 1956 bs->bs_protover = BSTP_PROTO_RSTP; /* STP instead of RSTP? */ 1957 1958 getmicrotime(&bs->bs_last_tc_time); 1959 1960 LIST_INSERT_HEAD(&bstp_list, bs, bs_list); 1961 splx(s); 1962 1963 return (bs); 1964 } 1965 1966 void 1967 bstp_destroy(struct bstp_state *bs) 1968 { 1969 int s; 1970 1971 if (bs == NULL) 1972 return; 1973 1974 if (!LIST_EMPTY(&bs->bs_bplist)) 1975 panic("bstp still active"); 1976 1977 s = splnet(); 1978 LIST_REMOVE(bs, bs_list); 1979 free(bs, M_DEVBUF); 1980 splx(s); 1981 } 1982 1983 void 1984 bstp_stop(struct bstp_state *bs) 1985 { 1986 struct bstp_port *bp; 1987 1988 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 1989 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 1990 1991 if (timeout_initialized(&bs->bs_bstptimeout)) 1992 timeout_del(&bs->bs_bstptimeout); 1993 } 1994 1995 struct bstp_port * 1996 bstp_add(struct bstp_state *bs, struct ifnet *ifp) 1997 { 1998 struct bstp_port *bp; 1999 2000 switch (ifp->if_type) { 2001 case IFT_ETHER: /* These can do spanning tree. */ 2002 break; 2003 default: 2004 /* Nothing else can. */ 2005 return (NULL); 2006 } 2007 2008 bp = malloc(sizeof(*bp), M_DEVBUF, M_NOWAIT|M_ZERO); 2009 if (bp == NULL) 2010 return (NULL); 2011 2012 bp->bp_ifp = ifp; 2013 bp->bp_bs = bs; 2014 bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY; 2015 bp->bp_txcount = 0; 2016 2017 /* Init state */ 2018 bp->bp_infois = BSTP_INFO_DISABLED; 2019 bp->bp_flags = BSTP_PORT_AUTOEDGE | BSTP_PORT_AUTOPTP; 2020 bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); 2021 bstp_set_port_proto(bp, bs->bs_protover); 2022 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2023 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 2024 bp->bp_path_cost = bstp_calc_path_cost(bp); 2025 2026 LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next); 2027 2028 bp->bp_active = 1; 2029 bp->bp_flags |= BSTP_PORT_NEWINFO; 2030 bstp_initialization(bs); 2031 bstp_update_roles(bs, bp); 2032 2033 /* Register callback for physical link state changes */ 2034 if (ifp->if_linkstatehooks != NULL) 2035 bp->bp_lhcookie = hook_establish(ifp->if_linkstatehooks, 1, 2036 bstp_ifstate, ifp); 2037 2038 return (bp); 2039 } 2040 2041 void 2042 bstp_delete(struct bstp_port *bp) 2043 { 2044 struct bstp_state *bs = bp->bp_bs; 2045 struct ifnet *ifp = bp->bp_ifp; 2046 2047 if (!bp->bp_active) 2048 panic("not a bstp member"); 2049 2050 if (ifp != NULL && ifp->if_linkstatehooks != NULL) 2051 hook_disestablish(ifp->if_linkstatehooks, bp->bp_lhcookie); 2052 2053 LIST_REMOVE(bp, bp_next); 2054 bp->bp_bs = NULL; 2055 bp->bp_active = 0; 2056 free(bp, M_DEVBUF); 2057 bstp_initialization(bs); 2058 } 2059 2060 u_int8_t 2061 bstp_getstate(struct bstp_state *bs, struct bstp_port *bp) 2062 { 2063 u_int8_t state = bp->bp_state; 2064 2065 if (bs->bs_protover != BSTP_PROTO_STP) 2066 return (state); 2067 2068 /* 2069 * Translate RSTP roles and states to STP port states 2070 * (IEEE Std 802.1D-2004 Table 17-1). 2071 */ 2072 if (bp->bp_role == BSTP_ROLE_DISABLED) 2073 state = BSTP_IFSTATE_DISABLED; 2074 else if (bp->bp_role == BSTP_ROLE_ALTERNATE || 2075 bp->bp_role == BSTP_ROLE_BACKUP) 2076 state = BSTP_IFSTATE_BLOCKING; 2077 else if (state == BSTP_IFSTATE_DISCARDING) 2078 state = BSTP_IFSTATE_LISTENING; 2079 2080 return (state); 2081 } 2082 2083 void 2084 bstp_ifsflags(struct bstp_port *bp, u_int flags) 2085 { 2086 struct bstp_state *bs; 2087 2088 if ((flags & IFBIF_STP) == 0) 2089 return; 2090 bs = bp->bp_bs; 2091 2092 /* 2093 * Set edge status 2094 */ 2095 if (flags & IFBIF_BSTP_AUTOEDGE) { 2096 if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) == 0) { 2097 bp->bp_flags |= BSTP_PORT_AUTOEDGE; 2098 2099 /* we may be able to transition straight to edge */ 2100 if (bp->bp_edge_delay_timer.active == 0) 2101 bstp_edge_delay_expiry(bs, bp); 2102 } 2103 } else 2104 bp->bp_flags &= ~BSTP_PORT_AUTOEDGE; 2105 2106 if (flags & IFBIF_BSTP_EDGE) 2107 bp->bp_operedge = 1; 2108 else 2109 bp->bp_operedge = 0; 2110 2111 /* 2112 * Set point to point status 2113 */ 2114 if (flags & IFBIF_BSTP_AUTOPTP) { 2115 if ((bp->bp_flags & BSTP_PORT_AUTOPTP) == 0) { 2116 bp->bp_flags |= BSTP_PORT_AUTOPTP; 2117 2118 bstp_ifupdstatus(bs, bp); 2119 } 2120 } else 2121 bp->bp_flags &= ~BSTP_PORT_AUTOPTP; 2122 2123 if (flags & IFBIF_BSTP_PTP) 2124 bp->bp_ptp_link = 1; 2125 else 2126 bp->bp_ptp_link = 0; 2127 } 2128 2129 int 2130 bstp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 2131 { 2132 struct bridge_softc *sc = (struct bridge_softc *)ifp; 2133 struct bstp_state *bs = sc->sc_stp; 2134 struct ifbrparam *ifbp = (struct ifbrparam *)data; 2135 struct ifbreq *ifbr = (struct ifbreq *)data; 2136 struct bridge_iflist *p; 2137 struct ifnet *ifs; 2138 struct bstp_port *bp; 2139 int r = 0, err = 0, val; 2140 2141 switch (cmd) { 2142 case SIOCBRDGSIFPRIO: 2143 case SIOCBRDGSIFCOST: 2144 ifs = ifunit(ifbr->ifbr_ifsname); 2145 if (ifs == NULL) { 2146 err = ENOENT; 2147 break; 2148 } 2149 if ((caddr_t)sc != ifs->if_bridge) { 2150 err = ESRCH; 2151 break; 2152 } 2153 LIST_FOREACH(p, &sc->sc_iflist, next) { 2154 if (p->ifp == ifs) 2155 break; 2156 } 2157 if (p == LIST_END(&sc->sc_iflist)) { 2158 err = ESRCH; 2159 break; 2160 } 2161 if ((p->bif_flags & IFBIF_STP) == 0) { 2162 err = EINVAL; 2163 break; 2164 } 2165 bp = p->bif_stp; 2166 break; 2167 default: 2168 break; 2169 } 2170 if (err) 2171 return (err); 2172 2173 switch (cmd) { 2174 case SIOCBRDGGPRI: 2175 ifbp->ifbrp_prio = bs->bs_bridge_priority; 2176 break; 2177 case SIOCBRDGSPRI: 2178 val = ifbp->ifbrp_prio; 2179 if (val < 0 || val > BSTP_MAX_PRIORITY) { 2180 err = EINVAL; 2181 break; 2182 } 2183 2184 /* Limit to steps of 4096 */ 2185 val -= val % 4096; 2186 bs->bs_bridge_priority = val; 2187 r = 1; 2188 break; 2189 case SIOCBRDGGMA: 2190 ifbp->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 2191 break; 2192 case SIOCBRDGSMA: 2193 val = ifbp->ifbrp_maxage; 2194 2195 /* convert seconds to ticks */ 2196 val *= BSTP_TICK_VAL; 2197 2198 if (val < BSTP_MIN_MAX_AGE || val > BSTP_MAX_MAX_AGE) { 2199 err = EINVAL; 2200 break; 2201 } 2202 bs->bs_bridge_max_age = val; 2203 r = 1; 2204 break; 2205 case SIOCBRDGGHT: 2206 ifbp->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 2207 break; 2208 case SIOCBRDGSHT: 2209 val = ifbp->ifbrp_hellotime; 2210 2211 /* convert seconds to ticks */ 2212 val *= BSTP_TICK_VAL; 2213 2214 /* value can only be changed in leagacy stp mode */ 2215 if (bs->bs_protover != BSTP_PROTO_STP) { 2216 err = EPERM; 2217 break; 2218 } 2219 if (val < BSTP_MIN_HELLO_TIME || val > BSTP_MAX_HELLO_TIME) { 2220 err = EINVAL; 2221 break; 2222 } 2223 bs->bs_bridge_htime = val; 2224 r = 1; 2225 break; 2226 case SIOCBRDGGFD: 2227 ifbp->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 2228 break; 2229 case SIOCBRDGSFD: 2230 val = ifbp->ifbrp_fwddelay; 2231 2232 /* convert seconds to ticks */ 2233 val *= BSTP_TICK_VAL; 2234 2235 if (val < BSTP_MIN_FORWARD_DELAY || 2236 val > BSTP_MAX_FORWARD_DELAY) { 2237 err = EINVAL; 2238 break; 2239 } 2240 bs->bs_bridge_fdelay = val; 2241 r = 1; 2242 break; 2243 case SIOCBRDGSTXHC: 2244 val = ifbp->ifbrp_txhc; 2245 2246 if (val < BSTP_MIN_HOLD_COUNT || val > BSTP_MAX_HOLD_COUNT) { 2247 err = EINVAL; 2248 break; 2249 } 2250 bs->bs_txholdcount = val; 2251 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) 2252 bp->bp_txcount = 0; 2253 break; 2254 case SIOCBRDGSIFPRIO: 2255 val = ifbr->ifbr_priority; 2256 if (val < 0 || val > BSTP_MAX_PORT_PRIORITY) 2257 return (EINVAL); 2258 2259 /* Limit to steps of 16 */ 2260 val -= val % 16; 2261 bp->bp_priority = val; 2262 r = 1; 2263 break; 2264 case SIOCBRDGSIFCOST: 2265 val = ifbr->ifbr_path_cost; 2266 if (val > BSTP_MAX_PATH_COST) { 2267 err = EINVAL; 2268 break; 2269 } 2270 if (val == 0) { /* use auto */ 2271 bp->bp_flags &= ~BSTP_PORT_ADMCOST; 2272 bp->bp_path_cost = bstp_calc_path_cost(bp); 2273 } else { 2274 bp->bp_path_cost = val; 2275 bp->bp_flags |= BSTP_PORT_ADMCOST; 2276 } 2277 r = 1; 2278 break; 2279 case SIOCBRDGSPROTO: 2280 val = ifbp->ifbrp_proto; 2281 2282 /* Supported protocol versions */ 2283 switch (val) { 2284 case BSTP_PROTO_STP: 2285 case BSTP_PROTO_RSTP: 2286 bs->bs_protover = val; 2287 bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; 2288 LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { 2289 /* reinit state */ 2290 bp->bp_infois = BSTP_INFO_DISABLED; 2291 bp->bp_txcount = 0; 2292 bstp_set_port_proto(bp, bs->bs_protover); 2293 bstp_set_port_role(bp, BSTP_ROLE_DISABLED); 2294 bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); 2295 bstp_timer_stop(&bp->bp_recent_backup_timer); 2296 } 2297 r = 1; 2298 break; 2299 default: 2300 err = EINVAL; 2301 } 2302 break; 2303 default: 2304 break; 2305 } 2306 2307 if (r) 2308 bstp_initialization(bs); 2309 2310 return (err); 2311 } 2312 #endif /* NBRIDGE */ 2313