| 1 | /* $NetBSD: bridgestp.c,v 1.23 2016/06/10 13:27:15 ozaki-r Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2000 Jason L. Wright (jason@thought.net) |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. All advertising materials mentioning features or use of this software |
| 16 | * must display the following acknowledgement: |
| 17 | * This product includes software developed by Jason L. Wright |
| 18 | * 4. The name of the author may not be used to endorse or promote products |
| 19 | * derived from this software without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 22 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| 23 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 24 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
| 25 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 26 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 27 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 29 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
| 30 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 31 | * POSSIBILITY OF SUCH DAMAGE. |
| 32 | * |
| 33 | * OpenBSD: bridgestp.c,v 1.5 2001/03/22 03:48:29 jason Exp |
| 34 | */ |
| 35 | |
| 36 | /* |
| 37 | * Implementation of the spanning tree protocol as defined in |
| 38 | * ISO/IEC Final DIS 15802-3 (IEEE P802.1D/D17), May 25, 1998. |
| 39 | * (In English: IEEE 802.1D, Draft 17, 1998) |
| 40 | */ |
| 41 | |
| 42 | #include <sys/cdefs.h> |
| 43 | __KERNEL_RCSID(0, "$NetBSD: bridgestp.c,v 1.23 2016/06/10 13:27:15 ozaki-r Exp $" ); |
| 44 | |
| 45 | #include <sys/param.h> |
| 46 | #include <sys/systm.h> |
| 47 | #include <sys/mbuf.h> |
| 48 | #include <sys/socket.h> |
| 49 | #include <sys/ioctl.h> |
| 50 | #include <sys/device.h> |
| 51 | #include <sys/kernel.h> |
| 52 | #include <sys/callout.h> |
| 53 | |
| 54 | #include <net/if.h> |
| 55 | #include <net/if_dl.h> |
| 56 | #include <net/if_types.h> |
| 57 | #include <net/if_llc.h> |
| 58 | |
| 59 | #include <net/if_ether.h> |
| 60 | #include <net/if_bridgevar.h> |
| 61 | |
| 62 | /* BPDU message types */ |
| 63 | #define BSTP_MSGTYPE_CFG 0x00 /* Configuration */ |
| 64 | #define BSTP_MSGTYPE_TCN 0x80 /* Topology chg notification */ |
| 65 | |
| 66 | /* BPDU flags */ |
| 67 | #define BSTP_FLAG_TC 0x01 /* Topology change */ |
| 68 | #define BSTP_FLAG_TCA 0x80 /* Topology change ack */ |
| 69 | |
| 70 | #define BSTP_MESSAGE_AGE_INCR (1 * 256) /* in 256ths of a second */ |
| 71 | #define BSTP_TICK_VAL (1 * 256) /* in 256ths of a second */ |
| 72 | |
| 73 | /* |
| 74 | * Because BPDU's do not make nicely aligned structures, two different |
| 75 | * declarations are used: bstp_?bpdu (wire representation, packed) and |
| 76 | * bstp_*_unit (internal, nicely aligned version). |
| 77 | */ |
| 78 | |
| 79 | /* configuration bridge protocol data unit */ |
| 80 | struct bstp_cbpdu { |
| 81 | uint8_t cbu_dsap; /* LLC: destination sap */ |
| 82 | uint8_t cbu_ssap; /* LLC: source sap */ |
| 83 | uint8_t cbu_ctl; /* LLC: control */ |
| 84 | uint16_t cbu_protoid; /* protocol id */ |
| 85 | uint8_t cbu_protover; /* protocol version */ |
| 86 | uint8_t cbu_bpdutype; /* message type */ |
| 87 | uint8_t cbu_flags; /* flags (below) */ |
| 88 | |
| 89 | /* root id */ |
| 90 | uint16_t cbu_rootpri; /* root priority */ |
| 91 | uint8_t cbu_rootaddr[6]; /* root address */ |
| 92 | |
| 93 | uint32_t cbu_rootpathcost; /* root path cost */ |
| 94 | |
| 95 | /* bridge id */ |
| 96 | uint16_t cbu_bridgepri; /* bridge priority */ |
| 97 | uint8_t cbu_bridgeaddr[6]; /* bridge address */ |
| 98 | |
| 99 | uint16_t cbu_portid; /* port id */ |
| 100 | uint16_t cbu_messageage; /* current message age */ |
| 101 | uint16_t cbu_maxage; /* maximum age */ |
| 102 | uint16_t cbu_hellotime; /* hello time */ |
| 103 | uint16_t cbu_forwarddelay; /* forwarding delay */ |
| 104 | } __packed; |
| 105 | |
| 106 | /* topology change notification bridge protocol data unit */ |
| 107 | struct bstp_tbpdu { |
| 108 | uint8_t tbu_dsap; /* LLC: destination sap */ |
| 109 | uint8_t tbu_ssap; /* LLC: source sap */ |
| 110 | uint8_t tbu_ctl; /* LLC: control */ |
| 111 | uint16_t tbu_protoid; /* protocol id */ |
| 112 | uint8_t tbu_protover; /* protocol version */ |
| 113 | uint8_t tbu_bpdutype; /* message type */ |
| 114 | } __packed; |
| 115 | |
| 116 | const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; |
| 117 | |
| 118 | static void bstp_initialize_port(struct bridge_softc *, struct bridge_iflist *); |
| 119 | static void bstp_ifupdstatus(struct bridge_softc *, struct bridge_iflist *); |
| 120 | static void bstp_enable_port(struct bridge_softc *, struct bridge_iflist *); |
| 121 | static void bstp_disable_port(struct bridge_softc *, struct bridge_iflist *); |
| 122 | static int bstp_root_bridge(struct bridge_softc *sc); |
| 123 | static int bstp_supersedes_port_info(struct bridge_softc *, |
| 124 | struct bridge_iflist *, |
| 125 | struct bstp_config_unit *); |
| 126 | static int bstp_designated_port(struct bridge_softc *, struct bridge_iflist *); |
| 127 | static int bstp_designated_for_some_port(struct bridge_softc *); |
| 128 | static void bstp_transmit_config(struct bridge_softc *, struct bridge_iflist *); |
| 129 | static void bstp_transmit_tcn(struct bridge_softc *); |
| 130 | static void bstp_received_config_bpdu(struct bridge_softc *, |
| 131 | struct bridge_iflist *, |
| 132 | struct bstp_config_unit *); |
| 133 | static void bstp_received_tcn_bpdu(struct bridge_softc *, struct bridge_iflist *, |
| 134 | struct bstp_tcn_unit *); |
| 135 | static void bstp_record_config_information(struct bridge_softc *, |
| 136 | struct bridge_iflist *, |
| 137 | struct bstp_config_unit *); |
| 138 | static void bstp_record_config_timeout_values(struct bridge_softc *, |
| 139 | struct bstp_config_unit *); |
| 140 | static void bstp_config_bpdu_generation(struct bridge_softc *); |
| 141 | static void bstp_send_config_bpdu(struct bridge_softc *, struct bridge_iflist *, |
| 142 | struct bstp_config_unit *); |
| 143 | static void bstp_configuration_update(struct bridge_softc *); |
| 144 | static void bstp_root_selection(struct bridge_softc *); |
| 145 | static void bstp_designated_port_selection(struct bridge_softc *); |
| 146 | static void bstp_become_designated_port(struct bridge_softc *, |
| 147 | struct bridge_iflist *); |
| 148 | static void bstp_port_state_selection(struct bridge_softc *); |
| 149 | static void bstp_make_forwarding(struct bridge_softc *, struct bridge_iflist *); |
| 150 | static void bstp_make_blocking(struct bridge_softc *, struct bridge_iflist *); |
| 151 | static void bstp_set_port_state(struct bridge_iflist *, uint8_t); |
| 152 | #if notused |
| 153 | static void bstp_set_bridge_priority(struct bridge_softc *, uint64_t); |
| 154 | static void bstp_set_port_priority(struct bridge_softc *, struct bridge_iflist *, |
| 155 | uint16_t); |
| 156 | static void bstp_set_path_cost(struct bridge_softc *, struct bridge_iflist *, |
| 157 | uint32_t); |
| 158 | #endif |
| 159 | static void bstp_topology_change_detection(struct bridge_softc *); |
| 160 | static void bstp_topology_change_acknowledged(struct bridge_softc *); |
| 161 | static void bstp_acknowledge_topology_change(struct bridge_softc *, |
| 162 | struct bridge_iflist *); |
| 163 | |
| 164 | static void bstp_tick(void *); |
| 165 | static void bstp_timer_start(struct bridge_timer *, uint16_t); |
| 166 | static void bstp_timer_stop(struct bridge_timer *); |
| 167 | static int bstp_timer_expired(struct bridge_timer *, uint16_t); |
| 168 | |
| 169 | static void bstp_hold_timer_expiry(struct bridge_softc *, struct bridge_iflist *); |
| 170 | static void bstp_message_age_timer_expiry(struct bridge_softc *, |
| 171 | struct bridge_iflist *); |
| 172 | static void bstp_forward_delay_timer_expiry(struct bridge_softc *, |
| 173 | struct bridge_iflist *); |
| 174 | static void bstp_topology_change_timer_expiry(struct bridge_softc *); |
| 175 | static void bstp_tcn_timer_expiry(struct bridge_softc *); |
| 176 | static void bstp_hello_timer_expiry(struct bridge_softc *); |
| 177 | |
| 178 | static void |
| 179 | bstp_transmit_config(struct bridge_softc *sc, struct bridge_iflist *bif) |
| 180 | { |
| 181 | if (bif->bif_hold_timer.active) { |
| 182 | bif->bif_config_pending = 1; |
| 183 | return; |
| 184 | } |
| 185 | |
| 186 | bif->bif_config_bpdu.cu_message_type = BSTP_MSGTYPE_CFG; |
| 187 | bif->bif_config_bpdu.cu_rootid = sc->sc_designated_root; |
| 188 | bif->bif_config_bpdu.cu_root_path_cost = sc->sc_root_path_cost; |
| 189 | bif->bif_config_bpdu.cu_bridge_id = sc->sc_bridge_id; |
| 190 | bif->bif_config_bpdu.cu_port_id = bif->bif_port_id; |
| 191 | |
| 192 | if (bstp_root_bridge(sc)) |
| 193 | bif->bif_config_bpdu.cu_message_age = 0; |
| 194 | else |
| 195 | bif->bif_config_bpdu.cu_message_age = |
| 196 | sc->sc_root_port->bif_message_age_timer.value + |
| 197 | BSTP_MESSAGE_AGE_INCR; |
| 198 | |
| 199 | bif->bif_config_bpdu.cu_max_age = sc->sc_max_age; |
| 200 | bif->bif_config_bpdu.cu_hello_time = sc->sc_hello_time; |
| 201 | bif->bif_config_bpdu.cu_forward_delay = sc->sc_forward_delay; |
| 202 | bif->bif_config_bpdu.cu_topology_change_acknowledgment |
| 203 | = bif->bif_topology_change_acknowledge; |
| 204 | bif->bif_config_bpdu.cu_topology_change = sc->sc_topology_change; |
| 205 | |
| 206 | if (bif->bif_config_bpdu.cu_message_age < sc->sc_max_age) { |
| 207 | bif->bif_topology_change_acknowledge = 0; |
| 208 | bif->bif_config_pending = 0; |
| 209 | bstp_send_config_bpdu(sc, bif, &bif->bif_config_bpdu); |
| 210 | bstp_timer_start(&bif->bif_hold_timer, 0); |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | static void |
| 215 | bstp_send_config_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif, |
| 216 | struct bstp_config_unit *cu) |
| 217 | { |
| 218 | struct ifnet *ifp; |
| 219 | struct mbuf *m; |
| 220 | struct ether_header *eh; |
| 221 | struct bstp_cbpdu bpdu; |
| 222 | int s; |
| 223 | |
| 224 | KASSERT(BRIDGE_LOCKED(sc)); |
| 225 | |
| 226 | ifp = bif->bif_ifp; |
| 227 | |
| 228 | if ((ifp->if_flags & IFF_RUNNING) == 0) |
| 229 | return; |
| 230 | |
| 231 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
| 232 | if (m == NULL) |
| 233 | return; |
| 234 | |
| 235 | eh = mtod(m, struct ether_header *); |
| 236 | |
| 237 | m_set_rcvif(m, ifp); |
| 238 | m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); |
| 239 | m->m_len = m->m_pkthdr.len; |
| 240 | |
| 241 | bpdu.cbu_ssap = bpdu.cbu_dsap = LLC_8021D_LSAP; |
| 242 | bpdu.cbu_ctl = LLC_UI; |
| 243 | bpdu.cbu_protoid = htons(0); |
| 244 | bpdu.cbu_protover = 0; |
| 245 | bpdu.cbu_bpdutype = cu->cu_message_type; |
| 246 | bpdu.cbu_flags = (cu->cu_topology_change ? BSTP_FLAG_TC : 0) | |
| 247 | (cu->cu_topology_change_acknowledgment ? BSTP_FLAG_TCA : 0); |
| 248 | |
| 249 | bpdu.cbu_rootpri = htons(cu->cu_rootid >> 48); |
| 250 | bpdu.cbu_rootaddr[0] = cu->cu_rootid >> 40; |
| 251 | bpdu.cbu_rootaddr[1] = cu->cu_rootid >> 32; |
| 252 | bpdu.cbu_rootaddr[2] = cu->cu_rootid >> 24; |
| 253 | bpdu.cbu_rootaddr[3] = cu->cu_rootid >> 16; |
| 254 | bpdu.cbu_rootaddr[4] = cu->cu_rootid >> 8; |
| 255 | bpdu.cbu_rootaddr[5] = cu->cu_rootid >> 0; |
| 256 | |
| 257 | bpdu.cbu_rootpathcost = htonl(cu->cu_root_path_cost); |
| 258 | |
| 259 | bpdu.cbu_bridgepri = htons(cu->cu_rootid >> 48); |
| 260 | bpdu.cbu_bridgeaddr[0] = cu->cu_rootid >> 40; |
| 261 | bpdu.cbu_bridgeaddr[1] = cu->cu_rootid >> 32; |
| 262 | bpdu.cbu_bridgeaddr[2] = cu->cu_rootid >> 24; |
| 263 | bpdu.cbu_bridgeaddr[3] = cu->cu_rootid >> 16; |
| 264 | bpdu.cbu_bridgeaddr[4] = cu->cu_rootid >> 8; |
| 265 | bpdu.cbu_bridgeaddr[5] = cu->cu_rootid >> 0; |
| 266 | |
| 267 | bpdu.cbu_portid = htons(cu->cu_port_id); |
| 268 | bpdu.cbu_messageage = htons(cu->cu_message_age); |
| 269 | bpdu.cbu_maxage = htons(cu->cu_max_age); |
| 270 | bpdu.cbu_hellotime = htons(cu->cu_hello_time); |
| 271 | bpdu.cbu_forwarddelay = htons(cu->cu_forward_delay); |
| 272 | |
| 273 | memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), ETHER_ADDR_LEN); |
| 274 | memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); |
| 275 | eh->ether_type = htons(sizeof(bpdu)); |
| 276 | |
| 277 | memcpy(mtod(m, char *) + sizeof(*eh), &bpdu, sizeof(bpdu)); |
| 278 | |
| 279 | BRIDGE_UNLOCK(sc); |
| 280 | s = splnet(); |
| 281 | bridge_enqueue(sc, ifp, m, 0); |
| 282 | splx(s); |
| 283 | BRIDGE_LOCK(sc); |
| 284 | } |
| 285 | |
| 286 | static int |
| 287 | bstp_root_bridge(struct bridge_softc *sc) |
| 288 | { |
| 289 | return (sc->sc_designated_root == sc->sc_bridge_id); |
| 290 | } |
| 291 | |
| 292 | static int |
| 293 | bstp_supersedes_port_info(struct bridge_softc *sc, struct bridge_iflist *bif, |
| 294 | struct bstp_config_unit *cu) |
| 295 | { |
| 296 | if (cu->cu_rootid < bif->bif_designated_root) |
| 297 | return (1); |
| 298 | if (cu->cu_rootid > bif->bif_designated_root) |
| 299 | return (0); |
| 300 | |
| 301 | if (cu->cu_root_path_cost < bif->bif_designated_cost) |
| 302 | return (1); |
| 303 | if (cu->cu_root_path_cost > bif->bif_designated_cost) |
| 304 | return (0); |
| 305 | |
| 306 | if (cu->cu_bridge_id < bif->bif_designated_bridge) |
| 307 | return (1); |
| 308 | if (cu->cu_bridge_id > bif->bif_designated_bridge) |
| 309 | return (0); |
| 310 | |
| 311 | if (sc->sc_bridge_id != cu->cu_bridge_id) |
| 312 | return (1); |
| 313 | if (cu->cu_port_id <= bif->bif_designated_port) |
| 314 | return (1); |
| 315 | return (0); |
| 316 | } |
| 317 | |
| 318 | static void |
| 319 | bstp_record_config_information(struct bridge_softc *sc, |
| 320 | struct bridge_iflist *bif, struct bstp_config_unit *cu) |
| 321 | { |
| 322 | bif->bif_designated_root = cu->cu_rootid; |
| 323 | bif->bif_designated_cost = cu->cu_root_path_cost; |
| 324 | bif->bif_designated_bridge = cu->cu_bridge_id; |
| 325 | bif->bif_designated_port = cu->cu_port_id; |
| 326 | bstp_timer_start(&bif->bif_message_age_timer, cu->cu_message_age); |
| 327 | } |
| 328 | |
| 329 | static void |
| 330 | bstp_record_config_timeout_values(struct bridge_softc *sc, |
| 331 | struct bstp_config_unit *config) |
| 332 | { |
| 333 | sc->sc_max_age = config->cu_max_age; |
| 334 | sc->sc_hello_time = config->cu_hello_time; |
| 335 | sc->sc_forward_delay = config->cu_forward_delay; |
| 336 | sc->sc_topology_change = config->cu_topology_change; |
| 337 | } |
| 338 | |
| 339 | static void |
| 340 | bstp_config_bpdu_generation(struct bridge_softc *sc) |
| 341 | { |
| 342 | struct bridge_iflist *bif; |
| 343 | |
| 344 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
| 345 | if ((bif->bif_flags & IFBIF_STP) == 0) |
| 346 | continue; |
| 347 | if (bstp_designated_port(sc, bif) && |
| 348 | (bif->bif_state != BSTP_IFSTATE_DISABLED)) |
| 349 | bstp_transmit_config(sc, bif); |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | static int |
| 354 | bstp_designated_port(struct bridge_softc *sc, struct bridge_iflist *bif) |
| 355 | { |
| 356 | return ((bif->bif_designated_bridge == sc->sc_bridge_id) |
| 357 | && (bif->bif_designated_port == bif->bif_port_id)); |
| 358 | } |
| 359 | |
| 360 | static void |
| 361 | bstp_transmit_tcn(struct bridge_softc *sc) |
| 362 | { |
| 363 | struct bstp_tbpdu bpdu; |
| 364 | struct bridge_iflist *bif = sc->sc_root_port; |
| 365 | struct ifnet *ifp; |
| 366 | struct ether_header *eh; |
| 367 | struct mbuf *m; |
| 368 | int s; |
| 369 | |
| 370 | KASSERT(BRIDGE_LOCKED(sc)); |
| 371 | |
| 372 | KASSERT(bif != NULL); |
| 373 | ifp = bif->bif_ifp; |
| 374 | if ((ifp->if_flags & IFF_RUNNING) == 0) |
| 375 | return; |
| 376 | |
| 377 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
| 378 | if (m == NULL) |
| 379 | return; |
| 380 | |
| 381 | m_set_rcvif(m, ifp); |
| 382 | m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); |
| 383 | m->m_len = m->m_pkthdr.len; |
| 384 | |
| 385 | eh = mtod(m, struct ether_header *); |
| 386 | |
| 387 | memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), ETHER_ADDR_LEN); |
| 388 | memcpy(eh->ether_dhost, bstp_etheraddr, 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 | |
| 397 | memcpy(mtod(m, char *) + sizeof(*eh), &bpdu, sizeof(bpdu)); |
| 398 | |
| 399 | BRIDGE_UNLOCK(sc); |
| 400 | s = splnet(); |
| 401 | bridge_enqueue(sc, ifp, m, 0); |
| 402 | splx(s); |
| 403 | BRIDGE_LOCK(sc); |
| 404 | } |
| 405 | |
| 406 | static void |
| 407 | bstp_configuration_update(struct bridge_softc *sc) |
| 408 | { |
| 409 | bstp_root_selection(sc); |
| 410 | bstp_designated_port_selection(sc); |
| 411 | } |
| 412 | |
| 413 | static void |
| 414 | bstp_root_selection(struct bridge_softc *sc) |
| 415 | { |
| 416 | struct bridge_iflist *root_port = NULL, *bif; |
| 417 | |
| 418 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
| 419 | if ((bif->bif_flags & IFBIF_STP) == 0) |
| 420 | continue; |
| 421 | if (bstp_designated_port(sc, bif)) |
| 422 | continue; |
| 423 | if (bif->bif_state == BSTP_IFSTATE_DISABLED) |
| 424 | continue; |
| 425 | if (bif->bif_designated_root >= sc->sc_bridge_id) |
| 426 | continue; |
| 427 | if (root_port == NULL) |
| 428 | goto set_port; |
| 429 | |
| 430 | if (bif->bif_designated_root < root_port->bif_designated_root) |
| 431 | goto set_port; |
| 432 | if (bif->bif_designated_root > root_port->bif_designated_root) |
| 433 | continue; |
| 434 | |
| 435 | if ((bif->bif_designated_cost + bif->bif_path_cost) < |
| 436 | (root_port->bif_designated_cost + root_port->bif_path_cost)) |
| 437 | goto set_port; |
| 438 | if ((bif->bif_designated_cost + bif->bif_path_cost) > |
| 439 | (root_port->bif_designated_cost + root_port->bif_path_cost)) |
| 440 | continue; |
| 441 | |
| 442 | if (bif->bif_designated_bridge < |
| 443 | root_port->bif_designated_bridge) |
| 444 | goto set_port; |
| 445 | if (bif->bif_designated_bridge > |
| 446 | root_port->bif_designated_bridge) |
| 447 | continue; |
| 448 | |
| 449 | if (bif->bif_designated_port < root_port->bif_designated_port) |
| 450 | goto set_port; |
| 451 | if (bif->bif_designated_port > root_port->bif_designated_port) |
| 452 | continue; |
| 453 | |
| 454 | if (bif->bif_port_id >= root_port->bif_port_id) |
| 455 | continue; |
| 456 | set_port: |
| 457 | root_port = bif; |
| 458 | } |
| 459 | |
| 460 | sc->sc_root_port = root_port; |
| 461 | if (root_port == NULL) { |
| 462 | sc->sc_designated_root = sc->sc_bridge_id; |
| 463 | sc->sc_root_path_cost = 0; |
| 464 | } else { |
| 465 | sc->sc_designated_root = root_port->bif_designated_root; |
| 466 | sc->sc_root_path_cost = root_port->bif_designated_cost + |
| 467 | root_port->bif_path_cost; |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | static void |
| 472 | bstp_designated_port_selection(struct bridge_softc *sc) |
| 473 | { |
| 474 | struct bridge_iflist *bif; |
| 475 | |
| 476 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
| 477 | if ((bif->bif_flags & IFBIF_STP) == 0) |
| 478 | continue; |
| 479 | if (bstp_designated_port(sc, bif)) |
| 480 | goto designated; |
| 481 | if (bif->bif_designated_root != sc->sc_designated_root) |
| 482 | goto designated; |
| 483 | |
| 484 | if (sc->sc_root_path_cost < bif->bif_designated_cost) |
| 485 | goto designated; |
| 486 | if (sc->sc_root_path_cost > bif->bif_designated_cost) |
| 487 | continue; |
| 488 | |
| 489 | if (sc->sc_bridge_id < bif->bif_designated_bridge) |
| 490 | goto designated; |
| 491 | if (sc->sc_bridge_id > bif->bif_designated_bridge) |
| 492 | continue; |
| 493 | |
| 494 | if (bif->bif_port_id > bif->bif_designated_port) |
| 495 | continue; |
| 496 | designated: |
| 497 | bstp_become_designated_port(sc, bif); |
| 498 | } |
| 499 | } |
| 500 | |
| 501 | static void |
| 502 | bstp_become_designated_port(struct bridge_softc *sc, struct bridge_iflist *bif) |
| 503 | { |
| 504 | bif->bif_designated_root = sc->sc_designated_root; |
| 505 | bif->bif_designated_cost = sc->sc_root_path_cost; |
| 506 | bif->bif_designated_bridge = sc->sc_bridge_id; |
| 507 | bif->bif_designated_port = bif->bif_port_id; |
| 508 | } |
| 509 | |
| 510 | static void |
| 511 | bstp_port_state_selection(struct bridge_softc *sc) |
| 512 | { |
| 513 | struct bridge_iflist *bif; |
| 514 | |
| 515 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
| 516 | if ((bif->bif_flags & IFBIF_STP) == 0) |
| 517 | continue; |
| 518 | if (bif == sc->sc_root_port) { |
| 519 | bif->bif_config_pending = 0; |
| 520 | bif->bif_topology_change_acknowledge = 0; |
| 521 | bstp_make_forwarding(sc, bif); |
| 522 | } else if (bstp_designated_port(sc, bif)) { |
| 523 | bstp_timer_stop(&bif->bif_message_age_timer); |
| 524 | bstp_make_forwarding(sc, bif); |
| 525 | } else { |
| 526 | bif->bif_config_pending = 0; |
| 527 | bif->bif_topology_change_acknowledge = 0; |
| 528 | bstp_make_blocking(sc, bif); |
| 529 | } |
| 530 | } |
| 531 | } |
| 532 | |
| 533 | static void |
| 534 | bstp_make_forwarding(struct bridge_softc *sc, |
| 535 | struct bridge_iflist *bif) |
| 536 | { |
| 537 | if (bif->bif_state == BSTP_IFSTATE_BLOCKING) { |
| 538 | bstp_set_port_state(bif, BSTP_IFSTATE_LISTENING); |
| 539 | bstp_timer_start(&bif->bif_forward_delay_timer, 0); |
| 540 | } |
| 541 | } |
| 542 | |
| 543 | static void |
| 544 | bstp_make_blocking(struct bridge_softc *sc, struct bridge_iflist *bif) |
| 545 | { |
| 546 | if ((bif->bif_state != BSTP_IFSTATE_DISABLED) && |
| 547 | (bif->bif_state != BSTP_IFSTATE_BLOCKING)) { |
| 548 | if ((bif->bif_state == BSTP_IFSTATE_FORWARDING) || |
| 549 | (bif->bif_state == BSTP_IFSTATE_LEARNING)) { |
| 550 | if (bif->bif_change_detection_enabled) { |
| 551 | bstp_topology_change_detection(sc); |
| 552 | } |
| 553 | } |
| 554 | bstp_set_port_state(bif, BSTP_IFSTATE_BLOCKING); |
| 555 | bstp_timer_stop(&bif->bif_forward_delay_timer); |
| 556 | } |
| 557 | } |
| 558 | |
| 559 | static void |
| 560 | bstp_set_port_state(struct bridge_iflist *bif, uint8_t state) |
| 561 | { |
| 562 | bif->bif_state = state; |
| 563 | } |
| 564 | |
| 565 | static void |
| 566 | bstp_topology_change_detection(struct bridge_softc *sc) |
| 567 | { |
| 568 | if (bstp_root_bridge(sc)) { |
| 569 | sc->sc_topology_change = 1; |
| 570 | bstp_timer_start(&sc->sc_topology_change_timer, 0); |
| 571 | } else if (!sc->sc_topology_change_detected) { |
| 572 | bstp_transmit_tcn(sc); |
| 573 | bstp_timer_start(&sc->sc_tcn_timer, 0); |
| 574 | } |
| 575 | sc->sc_topology_change_detected = 1; |
| 576 | } |
| 577 | |
| 578 | static void |
| 579 | bstp_topology_change_acknowledged(struct bridge_softc *sc) |
| 580 | { |
| 581 | sc->sc_topology_change_detected = 0; |
| 582 | bstp_timer_stop(&sc->sc_tcn_timer); |
| 583 | } |
| 584 | |
| 585 | static void |
| 586 | bstp_acknowledge_topology_change(struct bridge_softc *sc, |
| 587 | struct bridge_iflist *bif) |
| 588 | { |
| 589 | bif->bif_topology_change_acknowledge = 1; |
| 590 | bstp_transmit_config(sc, bif); |
| 591 | } |
| 592 | |
| 593 | void |
| 594 | bstp_input(struct bridge_softc *sc, struct bridge_iflist *bif, struct mbuf *m) |
| 595 | { |
| 596 | struct ether_header *eh; |
| 597 | struct bstp_tbpdu tpdu; |
| 598 | struct bstp_cbpdu cpdu; |
| 599 | struct bstp_config_unit cu; |
| 600 | struct bstp_tcn_unit tu; |
| 601 | uint16_t len; |
| 602 | |
| 603 | #ifdef BRIDGE_MPSAFE |
| 604 | KASSERT(bif->bif_refs > 0); |
| 605 | #endif |
| 606 | |
| 607 | eh = mtod(m, struct ether_header *); |
| 608 | |
| 609 | if ((bif->bif_flags & IFBIF_STP) == 0) |
| 610 | goto out; |
| 611 | |
| 612 | len = ntohs(eh->ether_type); |
| 613 | if (len < sizeof(tpdu)) |
| 614 | goto out; |
| 615 | |
| 616 | m_adj(m, ETHER_HDR_LEN); |
| 617 | |
| 618 | if (m->m_pkthdr.len > len) |
| 619 | m_adj(m, len - m->m_pkthdr.len); |
| 620 | if (m->m_len < sizeof(tpdu) && |
| 621 | (m = m_pullup(m, sizeof(tpdu))) == NULL) |
| 622 | goto out; |
| 623 | |
| 624 | memcpy(&tpdu, mtod(m, void *), sizeof(tpdu)); |
| 625 | |
| 626 | if (tpdu.tbu_dsap != LLC_8021D_LSAP || |
| 627 | tpdu.tbu_ssap != LLC_8021D_LSAP || |
| 628 | tpdu.tbu_ctl != LLC_UI) |
| 629 | goto out; |
| 630 | if (tpdu.tbu_protoid != 0 || tpdu.tbu_protover != 0) |
| 631 | goto out; |
| 632 | |
| 633 | switch (tpdu.tbu_bpdutype) { |
| 634 | case BSTP_MSGTYPE_TCN: |
| 635 | tu.tu_message_type = tpdu.tbu_bpdutype; |
| 636 | |
| 637 | BRIDGE_LOCK(sc); |
| 638 | bstp_received_tcn_bpdu(sc, bif, &tu); |
| 639 | BRIDGE_UNLOCK(sc); |
| 640 | |
| 641 | break; |
| 642 | case BSTP_MSGTYPE_CFG: |
| 643 | if (m->m_len < sizeof(cpdu) && |
| 644 | (m = m_pullup(m, sizeof(cpdu))) == NULL) |
| 645 | goto out; |
| 646 | memcpy(&cpdu, mtod(m, void *), sizeof(cpdu)); |
| 647 | |
| 648 | cu.cu_rootid = |
| 649 | (((uint64_t)ntohs(cpdu.cbu_rootpri)) << 48) | |
| 650 | (((uint64_t)cpdu.cbu_rootaddr[0]) << 40) | |
| 651 | (((uint64_t)cpdu.cbu_rootaddr[1]) << 32) | |
| 652 | (((uint64_t)cpdu.cbu_rootaddr[2]) << 24) | |
| 653 | (((uint64_t)cpdu.cbu_rootaddr[3]) << 16) | |
| 654 | (((uint64_t)cpdu.cbu_rootaddr[4]) << 8) | |
| 655 | (((uint64_t)cpdu.cbu_rootaddr[5]) << 0); |
| 656 | |
| 657 | cu.cu_bridge_id = |
| 658 | (((uint64_t)ntohs(cpdu.cbu_bridgepri)) << 48) | |
| 659 | (((uint64_t)cpdu.cbu_bridgeaddr[0]) << 40) | |
| 660 | (((uint64_t)cpdu.cbu_bridgeaddr[1]) << 32) | |
| 661 | (((uint64_t)cpdu.cbu_bridgeaddr[2]) << 24) | |
| 662 | (((uint64_t)cpdu.cbu_bridgeaddr[3]) << 16) | |
| 663 | (((uint64_t)cpdu.cbu_bridgeaddr[4]) << 8) | |
| 664 | (((uint64_t)cpdu.cbu_bridgeaddr[5]) << 0); |
| 665 | |
| 666 | cu.cu_root_path_cost = ntohl(cpdu.cbu_rootpathcost); |
| 667 | cu.cu_message_age = ntohs(cpdu.cbu_messageage); |
| 668 | cu.cu_max_age = ntohs(cpdu.cbu_maxage); |
| 669 | cu.cu_hello_time = ntohs(cpdu.cbu_hellotime); |
| 670 | cu.cu_forward_delay = ntohs(cpdu.cbu_forwarddelay); |
| 671 | cu.cu_port_id = ntohs(cpdu.cbu_portid); |
| 672 | cu.cu_message_type = cpdu.cbu_bpdutype; |
| 673 | cu.cu_topology_change_acknowledgment = |
| 674 | (cpdu.cbu_flags & BSTP_FLAG_TCA) ? 1 : 0; |
| 675 | cu.cu_topology_change = |
| 676 | (cpdu.cbu_flags & BSTP_FLAG_TC) ? 1 : 0; |
| 677 | |
| 678 | BRIDGE_LOCK(sc); |
| 679 | bstp_received_config_bpdu(sc, bif, &cu); |
| 680 | BRIDGE_UNLOCK(sc); |
| 681 | |
| 682 | break; |
| 683 | default: |
| 684 | goto out; |
| 685 | } |
| 686 | |
| 687 | out: |
| 688 | if (m) |
| 689 | m_freem(m); |
| 690 | return; |
| 691 | } |
| 692 | |
| 693 | static void |
| 694 | bstp_received_config_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif, |
| 695 | struct bstp_config_unit *cu) |
| 696 | { |
| 697 | int root; |
| 698 | |
| 699 | root = bstp_root_bridge(sc); |
| 700 | |
| 701 | if (bif->bif_state != BSTP_IFSTATE_DISABLED) { |
| 702 | if (bstp_supersedes_port_info(sc, bif, cu)) { |
| 703 | bstp_record_config_information(sc, bif, cu); |
| 704 | bstp_configuration_update(sc); |
| 705 | bstp_port_state_selection(sc); |
| 706 | |
| 707 | if ((bstp_root_bridge(sc) == 0) && root) { |
| 708 | bstp_timer_stop(&sc->sc_hello_timer); |
| 709 | |
| 710 | if (sc->sc_topology_change_detected) { |
| 711 | bstp_timer_stop( |
| 712 | &sc->sc_topology_change_timer); |
| 713 | bstp_transmit_tcn(sc); |
| 714 | bstp_timer_start(&sc->sc_tcn_timer, 0); |
| 715 | } |
| 716 | } |
| 717 | |
| 718 | if (bif == sc->sc_root_port) { |
| 719 | bstp_record_config_timeout_values(sc, cu); |
| 720 | bstp_config_bpdu_generation(sc); |
| 721 | |
| 722 | if (cu->cu_topology_change_acknowledgment) |
| 723 | bstp_topology_change_acknowledged(sc); |
| 724 | } |
| 725 | } else if (bstp_designated_port(sc, bif)) |
| 726 | bstp_transmit_config(sc, bif); |
| 727 | } |
| 728 | } |
| 729 | |
| 730 | static void |
| 731 | bstp_received_tcn_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif, |
| 732 | struct bstp_tcn_unit *tcn) |
| 733 | { |
| 734 | if (bif->bif_state != BSTP_IFSTATE_DISABLED && |
| 735 | bstp_designated_port(sc, bif)) { |
| 736 | bstp_topology_change_detection(sc); |
| 737 | bstp_acknowledge_topology_change(sc, bif); |
| 738 | } |
| 739 | } |
| 740 | |
| 741 | static void |
| 742 | bstp_hello_timer_expiry(struct bridge_softc *sc) |
| 743 | { |
| 744 | bstp_config_bpdu_generation(sc); |
| 745 | bstp_timer_start(&sc->sc_hello_timer, 0); |
| 746 | } |
| 747 | |
| 748 | static void |
| 749 | bstp_message_age_timer_expiry(struct bridge_softc *sc, |
| 750 | struct bridge_iflist *bif) |
| 751 | { |
| 752 | int root; |
| 753 | |
| 754 | root = bstp_root_bridge(sc); |
| 755 | bstp_become_designated_port(sc, bif); |
| 756 | bstp_configuration_update(sc); |
| 757 | bstp_port_state_selection(sc); |
| 758 | |
| 759 | if ((bstp_root_bridge(sc)) && (root == 0)) { |
| 760 | sc->sc_max_age = sc->sc_bridge_max_age; |
| 761 | sc->sc_hello_time = sc->sc_bridge_hello_time; |
| 762 | sc->sc_forward_delay = sc->sc_bridge_forward_delay; |
| 763 | |
| 764 | bstp_topology_change_detection(sc); |
| 765 | bstp_timer_stop(&sc->sc_tcn_timer); |
| 766 | bstp_config_bpdu_generation(sc); |
| 767 | bstp_timer_start(&sc->sc_hello_timer, 0); |
| 768 | } |
| 769 | } |
| 770 | |
| 771 | static void |
| 772 | bstp_forward_delay_timer_expiry(struct bridge_softc *sc, |
| 773 | struct bridge_iflist *bif) |
| 774 | { |
| 775 | if (bif->bif_state == BSTP_IFSTATE_LISTENING) { |
| 776 | bstp_set_port_state(bif, BSTP_IFSTATE_LEARNING); |
| 777 | bstp_timer_start(&bif->bif_forward_delay_timer, 0); |
| 778 | } else if (bif->bif_state == BSTP_IFSTATE_LEARNING) { |
| 779 | bstp_set_port_state(bif, BSTP_IFSTATE_FORWARDING); |
| 780 | if (bstp_designated_for_some_port(sc) && |
| 781 | bif->bif_change_detection_enabled) |
| 782 | bstp_topology_change_detection(sc); |
| 783 | } |
| 784 | } |
| 785 | |
| 786 | static int |
| 787 | bstp_designated_for_some_port(struct bridge_softc *sc) |
| 788 | { |
| 789 | |
| 790 | struct bridge_iflist *bif; |
| 791 | |
| 792 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
| 793 | if ((bif->bif_flags & IFBIF_STP) == 0) |
| 794 | continue; |
| 795 | if (bif->bif_designated_bridge == sc->sc_bridge_id) |
| 796 | return (1); |
| 797 | } |
| 798 | return (0); |
| 799 | } |
| 800 | |
| 801 | static void |
| 802 | bstp_tcn_timer_expiry(struct bridge_softc *sc) |
| 803 | { |
| 804 | bstp_transmit_tcn(sc); |
| 805 | bstp_timer_start(&sc->sc_tcn_timer, 0); |
| 806 | } |
| 807 | |
| 808 | static void |
| 809 | bstp_topology_change_timer_expiry(struct bridge_softc *sc) |
| 810 | { |
| 811 | sc->sc_topology_change_detected = 0; |
| 812 | sc->sc_topology_change = 0; |
| 813 | } |
| 814 | |
| 815 | static void |
| 816 | bstp_hold_timer_expiry(struct bridge_softc *sc, struct bridge_iflist *bif) |
| 817 | { |
| 818 | if (bif->bif_config_pending) |
| 819 | bstp_transmit_config(sc, bif); |
| 820 | } |
| 821 | |
| 822 | void |
| 823 | bstp_initialization(struct bridge_softc *sc) |
| 824 | { |
| 825 | struct bridge_iflist *bif, *mif; |
| 826 | |
| 827 | mif = NULL; |
| 828 | |
| 829 | BRIDGE_LOCK(sc); |
| 830 | |
| 831 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
| 832 | if ((bif->bif_flags & IFBIF_STP) == 0) |
| 833 | continue; |
| 834 | if (bif->bif_ifp->if_type != IFT_ETHER) |
| 835 | continue; |
| 836 | bif->bif_port_id = (bif->bif_priority << 8) | |
| 837 | (bif->bif_ifp->if_index & 0xff); |
| 838 | |
| 839 | if (mif == NULL) { |
| 840 | mif = bif; |
| 841 | continue; |
| 842 | } |
| 843 | if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), |
| 844 | CLLADDR(mif->bif_ifp->if_sadl), ETHER_ADDR_LEN) < 0) { |
| 845 | mif = bif; |
| 846 | continue; |
| 847 | } |
| 848 | } |
| 849 | |
| 850 | if (mif == NULL) { |
| 851 | BRIDGE_UNLOCK(sc); |
| 852 | bstp_stop(sc); |
| 853 | return; |
| 854 | } |
| 855 | |
| 856 | sc->sc_bridge_id = |
| 857 | (((uint64_t)sc->sc_bridge_priority) << 48) | |
| 858 | (((uint64_t)(uint8_t)CLLADDR(mif->bif_ifp->if_sadl)[0]) << 40) | |
| 859 | (((uint64_t)(uint8_t)CLLADDR(mif->bif_ifp->if_sadl)[1]) << 32) | |
| 860 | (((uint64_t)(uint8_t)CLLADDR(mif->bif_ifp->if_sadl)[2]) << 24) | |
| 861 | (((uint64_t)(uint8_t)CLLADDR(mif->bif_ifp->if_sadl)[3]) << 16) | |
| 862 | (((uint64_t)(uint8_t)CLLADDR(mif->bif_ifp->if_sadl)[4]) << 8) | |
| 863 | (((uint64_t)(uint8_t)CLLADDR(mif->bif_ifp->if_sadl)[5]) << 0); |
| 864 | |
| 865 | BRIDGE_UNLOCK(sc); |
| 866 | |
| 867 | sc->sc_designated_root = sc->sc_bridge_id; |
| 868 | sc->sc_root_path_cost = 0; |
| 869 | sc->sc_root_port = NULL; |
| 870 | |
| 871 | sc->sc_max_age = sc->sc_bridge_max_age; |
| 872 | sc->sc_hello_time = sc->sc_bridge_hello_time; |
| 873 | sc->sc_forward_delay = sc->sc_bridge_forward_delay; |
| 874 | sc->sc_topology_change_detected = 0; |
| 875 | sc->sc_topology_change = 0; |
| 876 | bstp_timer_stop(&sc->sc_tcn_timer); |
| 877 | bstp_timer_stop(&sc->sc_topology_change_timer); |
| 878 | |
| 879 | if (callout_pending(&sc->sc_bstpcallout) == 0) |
| 880 | callout_reset(&sc->sc_bstpcallout, hz, |
| 881 | bstp_tick, sc); |
| 882 | |
| 883 | BRIDGE_LOCK(sc); |
| 884 | |
| 885 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
| 886 | if (bif->bif_flags & IFBIF_STP) |
| 887 | bstp_enable_port(sc, bif); |
| 888 | else |
| 889 | bstp_disable_port(sc, bif); |
| 890 | } |
| 891 | |
| 892 | bstp_port_state_selection(sc); |
| 893 | bstp_config_bpdu_generation(sc); |
| 894 | bstp_timer_start(&sc->sc_hello_timer, 0); |
| 895 | |
| 896 | BRIDGE_UNLOCK(sc); |
| 897 | } |
| 898 | |
| 899 | void |
| 900 | bstp_stop(struct bridge_softc *sc) |
| 901 | { |
| 902 | struct bridge_iflist *bif; |
| 903 | |
| 904 | BRIDGE_LOCK(sc); |
| 905 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
| 906 | bstp_set_port_state(bif, BSTP_IFSTATE_DISABLED); |
| 907 | bstp_timer_stop(&bif->bif_hold_timer); |
| 908 | bstp_timer_stop(&bif->bif_message_age_timer); |
| 909 | bstp_timer_stop(&bif->bif_forward_delay_timer); |
| 910 | } |
| 911 | BRIDGE_UNLOCK(sc); |
| 912 | |
| 913 | callout_stop(&sc->sc_bstpcallout); |
| 914 | |
| 915 | bstp_timer_stop(&sc->sc_topology_change_timer); |
| 916 | bstp_timer_stop(&sc->sc_tcn_timer); |
| 917 | bstp_timer_stop(&sc->sc_hello_timer); |
| 918 | |
| 919 | } |
| 920 | |
| 921 | static void |
| 922 | bstp_initialize_port(struct bridge_softc *sc, struct bridge_iflist *bif) |
| 923 | { |
| 924 | bstp_become_designated_port(sc, bif); |
| 925 | bstp_set_port_state(bif, BSTP_IFSTATE_BLOCKING); |
| 926 | bif->bif_topology_change_acknowledge = 0; |
| 927 | bif->bif_config_pending = 0; |
| 928 | bif->bif_change_detection_enabled = 1; |
| 929 | bstp_timer_stop(&bif->bif_message_age_timer); |
| 930 | bstp_timer_stop(&bif->bif_forward_delay_timer); |
| 931 | bstp_timer_stop(&bif->bif_hold_timer); |
| 932 | } |
| 933 | |
| 934 | static void |
| 935 | bstp_enable_port(struct bridge_softc *sc, struct bridge_iflist *bif) |
| 936 | { |
| 937 | bstp_initialize_port(sc, bif); |
| 938 | bstp_port_state_selection(sc); |
| 939 | } |
| 940 | |
| 941 | static void |
| 942 | bstp_disable_port(struct bridge_softc *sc, struct bridge_iflist *bif) |
| 943 | { |
| 944 | int root; |
| 945 | |
| 946 | root = bstp_root_bridge(sc); |
| 947 | bstp_become_designated_port(sc, bif); |
| 948 | bstp_set_port_state(bif, BSTP_IFSTATE_DISABLED); |
| 949 | bif->bif_topology_change_acknowledge = 0; |
| 950 | bif->bif_config_pending = 0; |
| 951 | bstp_timer_stop(&bif->bif_message_age_timer); |
| 952 | bstp_timer_stop(&bif->bif_forward_delay_timer); |
| 953 | bstp_configuration_update(sc); |
| 954 | bstp_port_state_selection(sc); |
| 955 | |
| 956 | if (bstp_root_bridge(sc) && (root == 0)) { |
| 957 | sc->sc_max_age = sc->sc_bridge_max_age; |
| 958 | sc->sc_hello_time = sc->sc_bridge_hello_time; |
| 959 | sc->sc_forward_delay = sc->sc_bridge_forward_delay; |
| 960 | |
| 961 | bstp_topology_change_detection(sc); |
| 962 | bstp_timer_stop(&sc->sc_tcn_timer); |
| 963 | bstp_config_bpdu_generation(sc); |
| 964 | bstp_timer_start(&sc->sc_hello_timer, 0); |
| 965 | } |
| 966 | } |
| 967 | |
| 968 | #if notused |
| 969 | static void |
| 970 | bstp_set_bridge_priority(struct bridge_softc *sc, uint64_t new_bridge_id) |
| 971 | { |
| 972 | struct bridge_iflist *bif; |
| 973 | int root; |
| 974 | |
| 975 | root = bstp_root_bridge(sc); |
| 976 | |
| 977 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
| 978 | if ((bif->bif_flags & IFBIF_STP) == 0) |
| 979 | continue; |
| 980 | if (bstp_designated_port(sc, bif)) |
| 981 | bif->bif_designated_bridge = new_bridge_id; |
| 982 | } |
| 983 | |
| 984 | sc->sc_bridge_id = new_bridge_id; |
| 985 | |
| 986 | bstp_configuration_update(sc); |
| 987 | bstp_port_state_selection(sc); |
| 988 | |
| 989 | if (bstp_root_bridge(sc) && (root == 0)) { |
| 990 | sc->sc_max_age = sc->sc_bridge_max_age; |
| 991 | sc->sc_hello_time = sc->sc_bridge_hello_time; |
| 992 | sc->sc_forward_delay = sc->sc_bridge_forward_delay; |
| 993 | |
| 994 | bstp_topology_change_detection(sc); |
| 995 | bstp_timer_stop(&sc->sc_tcn_timer); |
| 996 | bstp_config_bpdu_generation(sc); |
| 997 | bstp_timer_start(&sc->sc_hello_timer, 0); |
| 998 | } |
| 999 | } |
| 1000 | |
| 1001 | static void |
| 1002 | bstp_set_port_priority(struct bridge_softc *sc, struct bridge_iflist *bif, |
| 1003 | uint16_t new_port_id) |
| 1004 | { |
| 1005 | if (bstp_designated_port(sc, bif)) |
| 1006 | bif->bif_designated_port = new_port_id; |
| 1007 | |
| 1008 | bif->bif_port_id = new_port_id; |
| 1009 | |
| 1010 | if ((sc->sc_bridge_id == bif->bif_designated_bridge) && |
| 1011 | (bif->bif_port_id < bif->bif_designated_port)) { |
| 1012 | bstp_become_designated_port(sc, bif); |
| 1013 | bstp_port_state_selection(sc); |
| 1014 | } |
| 1015 | } |
| 1016 | |
| 1017 | static void |
| 1018 | bstp_set_path_cost(struct bridge_softc *sc, struct bridge_iflist *bif, |
| 1019 | uint32_t path_cost) |
| 1020 | { |
| 1021 | bif->bif_path_cost = path_cost; |
| 1022 | bstp_configuration_update(sc); |
| 1023 | bstp_port_state_selection(sc); |
| 1024 | } |
| 1025 | #endif |
| 1026 | |
| 1027 | static void |
| 1028 | bstp_ifupdstatus(struct bridge_softc *sc, struct bridge_iflist *bif) |
| 1029 | { |
| 1030 | struct ifnet *ifp = bif->bif_ifp; |
| 1031 | |
| 1032 | if (ifp->if_flags & IFF_UP) { |
| 1033 | switch (ifp->if_link_state) { |
| 1034 | case LINK_STATE_UNKNOWN: |
| 1035 | /* |
| 1036 | * Just enable the port if the link state is |
| 1037 | * unknown. |
| 1038 | */ |
| 1039 | if (bif->bif_state == BSTP_IFSTATE_DISABLED) |
| 1040 | bstp_enable_port(sc, bif); |
| 1041 | break; |
| 1042 | |
| 1043 | case LINK_STATE_UP: |
| 1044 | if (bif->bif_state == BSTP_IFSTATE_DISABLED) |
| 1045 | bstp_enable_port(sc, bif); |
| 1046 | break; |
| 1047 | |
| 1048 | case LINK_STATE_DOWN: |
| 1049 | if (bif->bif_state != BSTP_IFSTATE_DISABLED) |
| 1050 | bstp_disable_port(sc, bif); |
| 1051 | break; |
| 1052 | } |
| 1053 | return; |
| 1054 | } |
| 1055 | |
| 1056 | if (bif->bif_state != BSTP_IFSTATE_DISABLED) |
| 1057 | bstp_disable_port(sc, bif); |
| 1058 | } |
| 1059 | |
| 1060 | static void |
| 1061 | bstp_tick(void *arg) |
| 1062 | { |
| 1063 | struct bridge_softc *sc = arg; |
| 1064 | struct bridge_iflist *bif; |
| 1065 | int s; |
| 1066 | |
| 1067 | s = splnet(); |
| 1068 | BRIDGE_LOCK(sc); |
| 1069 | |
| 1070 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
| 1071 | if ((bif->bif_flags & IFBIF_STP) == 0) |
| 1072 | continue; |
| 1073 | /* |
| 1074 | * XXX This can cause a lag in "link does away" |
| 1075 | * XXX and "spanning tree gets updated". We need |
| 1076 | * XXX come sort of callback from the link state |
| 1077 | * XXX update code to kick spanning tree. |
| 1078 | * XXX --thorpej@NetBSD.org |
| 1079 | */ |
| 1080 | bstp_ifupdstatus(sc, bif); |
| 1081 | } |
| 1082 | |
| 1083 | if (bstp_timer_expired(&sc->sc_hello_timer, sc->sc_hello_time)) |
| 1084 | bstp_hello_timer_expiry(sc); |
| 1085 | |
| 1086 | if (bstp_timer_expired(&sc->sc_tcn_timer, sc->sc_bridge_hello_time)) |
| 1087 | bstp_tcn_timer_expiry(sc); |
| 1088 | |
| 1089 | if (bstp_timer_expired(&sc->sc_topology_change_timer, |
| 1090 | sc->sc_topology_change_time)) |
| 1091 | bstp_topology_change_timer_expiry(sc); |
| 1092 | |
| 1093 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
| 1094 | if ((bif->bif_flags & IFBIF_STP) == 0) |
| 1095 | continue; |
| 1096 | if (bstp_timer_expired(&bif->bif_message_age_timer, |
| 1097 | sc->sc_max_age)) |
| 1098 | bstp_message_age_timer_expiry(sc, bif); |
| 1099 | } |
| 1100 | |
| 1101 | BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { |
| 1102 | if ((bif->bif_flags & IFBIF_STP) == 0) |
| 1103 | continue; |
| 1104 | if (bstp_timer_expired(&bif->bif_forward_delay_timer, |
| 1105 | sc->sc_forward_delay)) |
| 1106 | bstp_forward_delay_timer_expiry(sc, bif); |
| 1107 | |
| 1108 | if (bstp_timer_expired(&bif->bif_hold_timer, |
| 1109 | sc->sc_hold_time)) |
| 1110 | bstp_hold_timer_expiry(sc, bif); |
| 1111 | } |
| 1112 | |
| 1113 | if (sc->sc_if.if_flags & IFF_RUNNING) |
| 1114 | callout_reset(&sc->sc_bstpcallout, hz, bstp_tick, sc); |
| 1115 | |
| 1116 | BRIDGE_UNLOCK(sc); |
| 1117 | splx(s); |
| 1118 | } |
| 1119 | |
| 1120 | static void |
| 1121 | bstp_timer_start(struct bridge_timer *t, uint16_t v) |
| 1122 | { |
| 1123 | t->value = v; |
| 1124 | t->active = 1; |
| 1125 | } |
| 1126 | |
| 1127 | static void |
| 1128 | bstp_timer_stop(struct bridge_timer *t) |
| 1129 | { |
| 1130 | t->value = 0; |
| 1131 | t->active = 0; |
| 1132 | } |
| 1133 | |
| 1134 | static int |
| 1135 | bstp_timer_expired(struct bridge_timer *t, uint16_t v) |
| 1136 | { |
| 1137 | if (t->active == 0) |
| 1138 | return (0); |
| 1139 | t->value += BSTP_TICK_VAL; |
| 1140 | if (t->value >= v) { |
| 1141 | bstp_timer_stop(t); |
| 1142 | return (1); |
| 1143 | } |
| 1144 | return (0); |
| 1145 | |
| 1146 | } |
| 1147 | |