ieee80211_hwmp.c revision 197413
1/*- 2 * Copyright (c) 2009 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Rui Paulo under sponsorship from the 6 * FreeBSD Foundation. 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 AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29#include <sys/cdefs.h> 30#ifdef __FreeBSD__ 31__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_hwmp.c 197413 2009-09-22 18:18:14Z rpaulo $"); 32#endif 33 34/* 35 * IEEE 802.11s Hybrid Wireless Mesh Protocol, HWMP. 36 * 37 * Based on March 2009, D3.0 802.11s draft spec. 38 */ 39#include "opt_inet.h" 40#include "opt_wlan.h" 41 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/mbuf.h> 45#include <sys/malloc.h> 46#include <sys/kernel.h> 47 48#include <sys/socket.h> 49#include <sys/sockio.h> 50#include <sys/endian.h> 51#include <sys/errno.h> 52#include <sys/proc.h> 53#include <sys/sysctl.h> 54 55#include <net/if.h> 56#include <net/if_media.h> 57#include <net/if_llc.h> 58#include <net/ethernet.h> 59 60#include <net/bpf.h> 61 62#include <net80211/ieee80211_var.h> 63#include <net80211/ieee80211_action.h> 64#include <net80211/ieee80211_input.h> 65#include <net80211/ieee80211_mesh.h> 66 67static void hwmp_vattach(struct ieee80211vap *); 68static void hwmp_vdetach(struct ieee80211vap *); 69static int hwmp_newstate(struct ieee80211vap *, 70 enum ieee80211_state, int); 71static int hwmp_send_action(struct ieee80211_node *, 72 const uint8_t [IEEE80211_ADDR_LEN], 73 const uint8_t [IEEE80211_ADDR_LEN], 74 uint8_t *, size_t); 75static uint8_t * hwmp_add_meshpreq(uint8_t *, 76 const struct ieee80211_meshpreq_ie *); 77static uint8_t * hwmp_add_meshprep(uint8_t *, 78 const struct ieee80211_meshprep_ie *); 79static uint8_t * hwmp_add_meshperr(uint8_t *, 80 const struct ieee80211_meshperr_ie *); 81static uint8_t * hwmp_add_meshrann(uint8_t *, 82 const struct ieee80211_meshrann_ie *); 83static void hwmp_rootmode_setup(struct ieee80211vap *); 84static void hwmp_rootmode_cb(void *); 85static void hwmp_rootmode_rann_cb(void *); 86static void hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *, 87 const struct ieee80211_frame *, 88 const struct ieee80211_meshpreq_ie *); 89static int hwmp_send_preq(struct ieee80211_node *, 90 const uint8_t [IEEE80211_ADDR_LEN], 91 const uint8_t [IEEE80211_ADDR_LEN], 92 struct ieee80211_meshpreq_ie *); 93static void hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *, 94 const struct ieee80211_frame *, 95 const struct ieee80211_meshprep_ie *); 96static int hwmp_send_prep(struct ieee80211_node *, 97 const uint8_t [IEEE80211_ADDR_LEN], 98 const uint8_t [IEEE80211_ADDR_LEN], 99 struct ieee80211_meshprep_ie *); 100static void hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *, 101 const struct ieee80211_frame *, 102 const struct ieee80211_meshperr_ie *); 103static int hwmp_send_perr(struct ieee80211_node *, 104 const uint8_t [IEEE80211_ADDR_LEN], 105 const uint8_t [IEEE80211_ADDR_LEN], 106 struct ieee80211_meshperr_ie *); 107static void hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *, 108 const struct ieee80211_frame *, 109 const struct ieee80211_meshrann_ie *); 110static int hwmp_send_rann(struct ieee80211_node *, 111 const uint8_t [IEEE80211_ADDR_LEN], 112 const uint8_t [IEEE80211_ADDR_LEN], 113 struct ieee80211_meshrann_ie *); 114static struct ieee80211_node * 115 hwmp_discover(struct ieee80211vap *, 116 const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *); 117static void hwmp_peerdown(struct ieee80211_node *); 118 119static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 }; 120static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 }; 121 122/* unalligned little endian access */ 123#define LE_WRITE_2(p, v) do { \ 124 ((uint8_t *)(p))[0] = (v) & 0xff; \ 125 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 126} while (0) 127#define LE_WRITE_4(p, v) do { \ 128 ((uint8_t *)(p))[0] = (v) & 0xff; \ 129 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 130 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ 131 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ 132} while (0) 133 134 135/* NB: the Target Address set in a Proactive PREQ is the broadcast address. */ 136static const uint8_t broadcastaddr[IEEE80211_ADDR_LEN] = 137 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 138 139typedef uint32_t ieee80211_hwmp_seq; 140#define HWMP_SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0) 141#define HWMP_SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0) 142#define HWMP_SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0) 143#define HWMP_SEQ_GEQ(a, b) ((int32_t)((a)-(b)) >= 0) 144 145/* 146 * Private extension of ieee80211_mesh_route. 147 */ 148struct ieee80211_hwmp_route { 149 ieee80211_hwmp_seq hr_seq; /* last HWMP seq seen from dst*/ 150 ieee80211_hwmp_seq hr_preqid; /* last PREQ ID seen from dst */ 151 ieee80211_hwmp_seq hr_targetseq; /* seq. no. on our latest PREQ*/ 152 int hr_preqretries; 153}; 154struct ieee80211_hwmp_state { 155 ieee80211_hwmp_seq hs_seq; /* next seq to be used */ 156 ieee80211_hwmp_seq hs_preqid; /* next PREQ ID to be used */ 157 struct timeval hs_lastpreq; /* last time we sent a PREQ */ 158 struct timeval hs_lastperr; /* last time we sent a PERR */ 159 int hs_rootmode; /* proactive HWMP */ 160 struct callout hs_roottimer; 161 uint8_t hs_maxhops; /* max hop count */ 162}; 163 164SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0, 165 "IEEE 802.11s HWMP parameters"); 166static int ieee80211_hwmp_targetonly = 0; 167SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLTYPE_INT | CTLFLAG_RW, 168 &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs"); 169static int ieee80211_hwmp_replyforward = 1; 170SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, replyforward, CTLTYPE_INT | CTLFLAG_RW, 171 &ieee80211_hwmp_replyforward, 0, "Set RF bit on generated PREQs"); 172static int ieee80211_hwmp_pathtimeout = -1; 173SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, CTLTYPE_INT | CTLFLAG_RW, 174 &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I", 175 "path entry lifetime (ms)"); 176static int ieee80211_hwmp_roottimeout = -1; 177SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, CTLTYPE_INT | CTLFLAG_RW, 178 &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I", 179 "root PREQ timeout (ms)"); 180static int ieee80211_hwmp_rootint = -1; 181SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, CTLTYPE_INT | CTLFLAG_RW, 182 &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I", 183 "root interval (ms)"); 184static int ieee80211_hwmp_rannint = -1; 185SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, CTLTYPE_INT | CTLFLAG_RW, 186 &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I", 187 "root announcement interval (ms)"); 188 189#define IEEE80211_HWMP_DEFAULT_MAXHOPS 31 190 191static ieee80211_recv_action_func hwmp_recv_action_meshpath; 192 193static struct ieee80211_mesh_proto_path mesh_proto_hwmp = { 194 .mpp_descr = "HWMP", 195 .mpp_ie = IEEE80211_MESHCONF_HWMP, 196 .mpp_discover = hwmp_discover, 197 .mpp_peerdown = hwmp_peerdown, 198 .mpp_vattach = hwmp_vattach, 199 .mpp_vdetach = hwmp_vdetach, 200 .mpp_newstate = hwmp_newstate, 201 .mpp_privlen = sizeof(struct ieee80211_hwmp_route), 202}; 203SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact, CTLTYPE_INT | CTLFLAG_RW, 204 &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I", 205 "mesh route inactivity timeout (ms)"); 206 207 208static void 209ieee80211_hwmp_init(void) 210{ 211 ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000); 212 ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000); 213 ieee80211_hwmp_rootint = msecs_to_ticks(2*1000); 214 ieee80211_hwmp_rannint = msecs_to_ticks(1*1000); 215 216 /* 217 * Register action frame handler. 218 */ 219 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPATH, 220 IEEE80211_ACTION_MESHPATH_SEL, hwmp_recv_action_meshpath); 221 222 /* NB: default is 5 secs per spec */ 223 mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000); 224 225 /* 226 * Register HWMP. 227 */ 228 ieee80211_mesh_register_proto_path(&mesh_proto_hwmp); 229} 230SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL); 231 232void 233hwmp_vattach(struct ieee80211vap *vap) 234{ 235 struct ieee80211_hwmp_state *hs; 236 237 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 238 ("not a mesh vap, opmode %d", vap->iv_opmode)); 239 240 hs = malloc(sizeof(struct ieee80211_hwmp_state), M_80211_VAP, 241 M_NOWAIT | M_ZERO); 242 if (hs == NULL) { 243 printf("%s: couldn't alloc HWMP state\n", __func__); 244 return; 245 } 246 hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS; 247 callout_init(&hs->hs_roottimer, CALLOUT_MPSAFE); 248 vap->iv_hwmp = hs; 249} 250 251void 252hwmp_vdetach(struct ieee80211vap *vap) 253{ 254 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 255 256 callout_drain(&hs->hs_roottimer); 257 free(vap->iv_hwmp, M_80211_VAP); 258 vap->iv_hwmp = NULL; 259} 260 261int 262hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg) 263{ 264 enum ieee80211_state nstate = vap->iv_state; 265 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 266 267 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 268 __func__, ieee80211_state_name[ostate], 269 ieee80211_state_name[nstate], arg); 270 271 if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN) 272 callout_drain(&hs->hs_roottimer); 273 if (nstate == IEEE80211_S_RUN) 274 hwmp_rootmode_setup(vap); 275 return 0; 276} 277 278static int 279hwmp_recv_action_meshpath(struct ieee80211_node *ni, 280 const struct ieee80211_frame *wh, 281 const uint8_t *frm, const uint8_t *efrm) 282{ 283 struct ieee80211vap *vap = ni->ni_vap; 284 struct ieee80211_meshpreq_ie preq; 285 struct ieee80211_meshprep_ie prep; 286 struct ieee80211_meshperr_ie perr; 287 struct ieee80211_meshrann_ie rann; 288 const uint8_t *iefrm = frm + 2; /* action + code */ 289 int found = 0; 290 291 while (efrm - iefrm > 1) { 292 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0); 293 switch (*iefrm) { 294 case IEEE80211_ELEMID_MESHPREQ: 295 { 296 const struct ieee80211_meshpreq_ie *mpreq = 297 (const struct ieee80211_meshpreq_ie *) iefrm; 298 /* XXX > 1 target */ 299 if (mpreq->preq_len != 300 sizeof(struct ieee80211_meshpreq_ie) - 2) { 301 IEEE80211_DISCARD(vap, 302 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 303 wh, NULL, "%s", "PREQ with wrong len"); 304 vap->iv_stats.is_rx_mgtdiscard++; 305 break; 306 } 307 memcpy(&preq, mpreq, sizeof(preq)); 308 preq.preq_id = LE_READ_4(&mpreq->preq_id); 309 preq.preq_origseq = LE_READ_4(&mpreq->preq_origseq); 310 preq.preq_lifetime = LE_READ_4(&mpreq->preq_lifetime); 311 preq.preq_metric = LE_READ_4(&mpreq->preq_metric); 312 preq.preq_targets[0].target_seq = 313 LE_READ_4(&mpreq->preq_targets[0].target_seq); 314 hwmp_recv_preq(vap, ni, wh, &preq); 315 found++; 316 break; 317 } 318 case IEEE80211_ELEMID_MESHPREP: 319 { 320 const struct ieee80211_meshprep_ie *mprep = 321 (const struct ieee80211_meshprep_ie *) iefrm; 322 if (mprep->prep_len != 323 sizeof(struct ieee80211_meshprep_ie) - 2) { 324 IEEE80211_DISCARD(vap, 325 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 326 wh, NULL, "%s", "PREP with wrong len"); 327 vap->iv_stats.is_rx_mgtdiscard++; 328 break; 329 } 330 memcpy(&prep, mprep, sizeof(prep)); 331 prep.prep_targetseq = LE_READ_4(&mprep->prep_targetseq); 332 prep.prep_lifetime = LE_READ_4(&mprep->prep_lifetime); 333 prep.prep_metric = LE_READ_4(&mprep->prep_metric); 334 prep.prep_origseq = LE_READ_4(&mprep->prep_origseq); 335 hwmp_recv_prep(vap, ni, wh, &prep); 336 found++; 337 break; 338 } 339 case IEEE80211_ELEMID_MESHPERR: 340 { 341 const struct ieee80211_meshperr_ie *mperr = 342 (const struct ieee80211_meshperr_ie *) iefrm; 343 /* XXX > 1 target */ 344 if (mperr->perr_len != 345 sizeof(struct ieee80211_meshperr_ie) - 2) { 346 IEEE80211_DISCARD(vap, 347 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 348 wh, NULL, "%s", "PERR with wrong len"); 349 vap->iv_stats.is_rx_mgtdiscard++; 350 break; 351 } 352 memcpy(&perr, mperr, sizeof(perr)); 353 perr.perr_dests[0].dest_seq = 354 LE_READ_4(&mperr->perr_dests[0].dest_seq); 355 hwmp_recv_perr(vap, ni, wh, &perr); 356 found++; 357 break; 358 } 359 case IEEE80211_ELEMID_MESHRANN: 360 { 361 const struct ieee80211_meshrann_ie *mrann = 362 (const struct ieee80211_meshrann_ie *) iefrm; 363 if (mrann->rann_len != 364 sizeof(struct ieee80211_meshrann_ie) - 2) { 365 IEEE80211_DISCARD(vap, 366 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 367 wh, NULL, "%s", "RAN with wrong len"); 368 vap->iv_stats.is_rx_mgtdiscard++; 369 return 1; 370 } 371 memcpy(&rann, mrann, sizeof(rann)); 372 rann.rann_seq = LE_READ_4(&mrann->rann_seq); 373 rann.rann_metric = LE_READ_4(&mrann->rann_metric); 374 hwmp_recv_rann(vap, ni, wh, &rann); 375 found++; 376 break; 377 } 378 } 379 iefrm += iefrm[1] + 2; 380 } 381 if (!found) { 382 IEEE80211_DISCARD(vap, 383 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 384 wh, NULL, "%s", "PATH SEL action without IE"); 385 vap->iv_stats.is_rx_mgtdiscard++; 386 } 387 return 0; 388} 389 390static int 391hwmp_send_action(struct ieee80211_node *ni, 392 const uint8_t sa[IEEE80211_ADDR_LEN], 393 const uint8_t da[IEEE80211_ADDR_LEN], 394 uint8_t *ie, size_t len) 395{ 396 struct ieee80211vap *vap = ni->ni_vap; 397 struct ieee80211com *ic = ni->ni_ic; 398 struct ieee80211_bpf_params params; 399 struct mbuf *m; 400 uint8_t *frm; 401 402 if (vap->iv_state == IEEE80211_S_CAC) { 403 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 404 "block %s frame in CAC state", "HWMP action"); 405 vap->iv_stats.is_tx_badstate++; 406 return EIO; /* XXX */ 407 } 408 409 KASSERT(ni != NULL, ("null node")); 410 /* 411 * Hold a reference on the node so it doesn't go away until after 412 * the xmit is complete all the way in the driver. On error we 413 * will remove our reference. 414 */ 415#ifdef IEEE80211_DEBUG_REFCNT 416 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 417 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 418 __func__, __LINE__, 419 ni, ether_sprintf(ni->ni_macaddr), 420 ieee80211_node_refcnt(ni)+1); 421#endif 422 ieee80211_ref_node(ni); 423 424 m = ieee80211_getmgtframe(&frm, 425 ic->ic_headroom + sizeof(struct ieee80211_frame), 426 sizeof(struct ieee80211_action) + len 427 ); 428 if (m == NULL) { 429 ieee80211_free_node(ni); 430 vap->iv_stats.is_tx_nobuf++; 431 return ENOMEM; 432 } 433 *frm++ = IEEE80211_ACTION_CAT_MESHPATH; 434 *frm++ = IEEE80211_ACTION_MESHPATH_SEL; 435 switch (*ie) { 436 case IEEE80211_ELEMID_MESHPREQ: 437 frm = hwmp_add_meshpreq(frm, 438 (struct ieee80211_meshpreq_ie *)ie); 439 break; 440 case IEEE80211_ELEMID_MESHPREP: 441 frm = hwmp_add_meshprep(frm, 442 (struct ieee80211_meshprep_ie *)ie); 443 break; 444 case IEEE80211_ELEMID_MESHPERR: 445 frm = hwmp_add_meshperr(frm, 446 (struct ieee80211_meshperr_ie *)ie); 447 break; 448 case IEEE80211_ELEMID_MESHRANN: 449 frm = hwmp_add_meshrann(frm, 450 (struct ieee80211_meshrann_ie *)ie); 451 break; 452 } 453 454 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 455 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 456 if (m == NULL) { 457 ieee80211_free_node(ni); 458 vap->iv_stats.is_tx_nobuf++; 459 return ENOMEM; 460 } 461 ieee80211_send_setup(ni, m, 462 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION, 463 IEEE80211_NONQOS_TID, sa, da, sa); 464 465 m->m_flags |= M_ENCAP; /* mark encapsulated */ 466 IEEE80211_NODE_STAT(ni, tx_mgmt); 467 468 memset(¶ms, 0, sizeof(params)); 469 params.ibp_pri = WME_AC_VO; 470 params.ibp_rate0 = ni->ni_txparms->mgmtrate; 471 if (IEEE80211_IS_MULTICAST(da)) 472 params.ibp_try0 = 1; 473 else 474 params.ibp_try0 = ni->ni_txparms->maxretry; 475 params.ibp_power = ni->ni_txpower; 476 return ic->ic_raw_xmit(ni, m, ¶ms); 477} 478 479#define ADDSHORT(frm, v) do { \ 480 frm[0] = (v) & 0xff; \ 481 frm[1] = (v) >> 8; \ 482 frm += 2; \ 483} while (0) 484#define ADDWORD(frm, v) do { \ 485 LE_WRITE_4(frm, v); \ 486 frm += 4; \ 487} while (0) 488/* 489 * Add a Mesh Path Request IE to a frame. 490 */ 491static uint8_t * 492hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq) 493{ 494 int i; 495 496 *frm++ = IEEE80211_ELEMID_MESHPREQ; 497 *frm++ = sizeof(struct ieee80211_meshpreq_ie) - 2 + 498 (preq->preq_tcount - 1) * sizeof(*preq->preq_targets); 499 *frm++ = preq->preq_flags; 500 *frm++ = preq->preq_hopcount; 501 *frm++ = preq->preq_ttl; 502 ADDWORD(frm, preq->preq_id); 503 IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6; 504 ADDWORD(frm, preq->preq_origseq); 505 ADDWORD(frm, preq->preq_lifetime); 506 ADDWORD(frm, preq->preq_metric); 507 *frm++ = preq->preq_tcount; 508 for (i = 0; i < preq->preq_tcount; i++) { 509 *frm++ = preq->preq_targets[i].target_flags; 510 IEEE80211_ADDR_COPY(frm, preq->preq_targets[i].target_addr); 511 frm += 6; 512 ADDWORD(frm, preq->preq_targets[i].target_seq); 513 } 514 return frm; 515} 516 517/* 518 * Add a Mesh Path Reply IE to a frame. 519 */ 520static uint8_t * 521hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep) 522{ 523 *frm++ = IEEE80211_ELEMID_MESHPREP; 524 *frm++ = sizeof(struct ieee80211_meshprep_ie) - 2; 525 *frm++ = prep->prep_flags; 526 *frm++ = prep->prep_hopcount; 527 *frm++ = prep->prep_ttl; 528 IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6; 529 ADDWORD(frm, prep->prep_targetseq); 530 ADDWORD(frm, prep->prep_lifetime); 531 ADDWORD(frm, prep->prep_metric); 532 IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6; 533 ADDWORD(frm, prep->prep_origseq); 534 return frm; 535} 536 537/* 538 * Add a Mesh Path Error IE to a frame. 539 */ 540static uint8_t * 541hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr) 542{ 543 int i; 544 545 *frm++ = IEEE80211_ELEMID_MESHPERR; 546 *frm++ = sizeof(struct ieee80211_meshperr_ie) - 2 + 547 (perr->perr_ndests - 1) * sizeof(*perr->perr_dests); 548 *frm++ = perr->perr_ttl; 549 *frm++ = perr->perr_ndests; 550 for (i = 0; i < perr->perr_ndests; i++) { 551 *frm += perr->perr_dests[i].dest_flags; 552 IEEE80211_ADDR_COPY(frm, perr->perr_dests[i].dest_addr); 553 frm += 6; 554 ADDWORD(frm, perr->perr_dests[i].dest_seq); 555 ADDSHORT(frm, perr->perr_dests[i].dest_rcode); 556 } 557 return frm; 558} 559 560/* 561 * Add a Root Annoucement IE to a frame. 562 */ 563static uint8_t * 564hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann) 565{ 566 *frm++ = IEEE80211_ELEMID_MESHRANN; 567 *frm++ = sizeof(struct ieee80211_meshrann_ie) - 2; 568 *frm++ = rann->rann_flags; 569 *frm++ = rann->rann_hopcount; 570 *frm++ = rann->rann_ttl; 571 IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6; 572 ADDWORD(frm, rann->rann_seq); 573 ADDWORD(frm, rann->rann_metric); 574 return frm; 575} 576 577static void 578hwmp_rootmode_setup(struct ieee80211vap *vap) 579{ 580 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 581 582 switch (hs->hs_rootmode) { 583 case IEEE80211_HWMP_ROOTMODE_DISABLED: 584 callout_drain(&hs->hs_roottimer); 585 break; 586 case IEEE80211_HWMP_ROOTMODE_NORMAL: 587 case IEEE80211_HWMP_ROOTMODE_PROACTIVE: 588 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint, 589 hwmp_rootmode_cb, vap); 590 break; 591 case IEEE80211_HWMP_ROOTMODE_RANN: 592 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint, 593 hwmp_rootmode_rann_cb, vap); 594 break; 595 } 596} 597 598/* 599 * Send a broadcast Path Request to find all nodes on the mesh. We are 600 * called when the vap is configured as a HWMP root node. 601 */ 602#define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 603#define PREQ_TADDR(n) preq.preq_targets[n].target_addr 604#define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 605static void 606hwmp_rootmode_cb(void *arg) 607{ 608 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 609 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 610 struct ieee80211_mesh_state *ms = vap->iv_mesh; 611 struct ieee80211_meshpreq_ie preq; 612 613 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 614 "%s", "send broadcast PREQ"); 615 616 preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM; 617 if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL) 618 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PR; 619 if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE) 620 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP; 621 preq.preq_hopcount = 0; 622 preq.preq_ttl = ms->ms_ttl; 623 preq.preq_id = ++hs->hs_preqid; 624 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 625 preq.preq_origseq = ++hs->hs_seq; 626 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout); 627 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 628 preq.preq_tcount = 1; 629 IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr); 630 PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO | 631 IEEE80211_MESHPREQ_TFLAGS_RF; 632 PREQ_TSEQ(0) = 0; 633 vap->iv_stats.is_hwmp_rootreqs++; 634 hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &preq); 635 hwmp_rootmode_setup(vap); 636} 637#undef PREQ_TFLAGS 638#undef PREQ_TADDR 639#undef PREQ_TSEQ 640 641/* 642 * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are 643 * called when the vap is configured as a HWMP RANN root node. 644 */ 645static void 646hwmp_rootmode_rann_cb(void *arg) 647{ 648 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 649 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 650 struct ieee80211_mesh_state *ms = vap->iv_mesh; 651 struct ieee80211_meshrann_ie rann; 652 653 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 654 "%s", "send broadcast RANN"); 655 656 if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL) 657 rann.rann_flags |= IEEE80211_MESHRANN_FLAGS_PR; 658 rann.rann_hopcount = 0; 659 rann.rann_ttl = ms->ms_ttl; 660 IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr); 661 rann.rann_seq = ++hs->hs_seq; 662 rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 663 664 vap->iv_stats.is_hwmp_rootrann++; 665 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &rann); 666 hwmp_rootmode_setup(vap); 667} 668 669#define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags 670#define PREQ_TADDR(n) preq->preq_targets[n].target_addr 671#define PREQ_TSEQ(n) preq->preq_targets[n].target_seq 672static void 673hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni, 674 const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq) 675{ 676 struct ieee80211_mesh_state *ms = vap->iv_mesh; 677 struct ieee80211_mesh_route *rt = NULL; 678 struct ieee80211_mesh_route *rtorig = NULL; 679 struct ieee80211_hwmp_route *hrorig; 680 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 681 struct ieee80211_meshprep_ie prep; 682 683 if (ni == vap->iv_bss || 684 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED) 685 return; 686 /* 687 * Ignore PREQs from us. Could happen because someone forward it 688 * back to us. 689 */ 690 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr)) 691 return; 692 693 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 694 "received PREQ, source %s", ether_sprintf(preq->preq_origaddr)); 695 696 /* 697 * Acceptance criteria: if the PREQ is not for us and 698 * forwarding is disabled, discard this PREQ. 699 */ 700 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) && 701 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) { 702 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 703 preq->preq_origaddr, NULL, "%s", "not accepting PREQ"); 704 return; 705 } 706 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr); 707 if (rtorig == NULL) 708 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr); 709 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route); 710 /* 711 * Sequence number validation. 712 */ 713 if (HWMP_SEQ_LEQ(preq->preq_id, hrorig->hr_preqid) && 714 HWMP_SEQ_LEQ(preq->preq_origseq, hrorig->hr_seq)) { 715 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 716 "discard PREQ from %s, old seq no %u <= %u", 717 ether_sprintf(preq->preq_origaddr), 718 preq->preq_origseq, hrorig->hr_seq); 719 return; 720 } 721 hrorig->hr_preqid = preq->preq_id; 722 hrorig->hr_seq = preq->preq_origseq; 723 724 /* 725 * Check if the PREQ is addressed to us. 726 */ 727 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) { 728 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 729 "reply to %s", ether_sprintf(preq->preq_origaddr)); 730 /* 731 * Build and send a PREP frame. 732 */ 733 prep.prep_flags = 0; 734 prep.prep_hopcount = 0; 735 prep.prep_ttl = ms->ms_ttl; 736 IEEE80211_ADDR_COPY(prep.prep_targetaddr, preq->preq_origaddr); 737 prep.prep_targetseq = preq->preq_origseq; 738 prep.prep_lifetime = preq->preq_lifetime; 739 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 740 IEEE80211_ADDR_COPY(prep.prep_origaddr, vap->iv_myaddr); 741 prep.prep_origseq = ++hs->hs_seq; 742 hwmp_send_prep(ni, vap->iv_myaddr, wh->i_addr2, &prep); 743 /* 744 * Build the reverse path, if we don't have it already. 745 */ 746 rt = ieee80211_mesh_rt_find(vap, preq->preq_origaddr); 747 if (rt == NULL) 748 hwmp_discover(vap, preq->preq_origaddr, NULL); 749 else if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) 750 hwmp_discover(vap, rt->rt_dest, NULL); 751 return; 752 } 753 /* 754 * Proactive PREQ: reply with a proactive PREP to the 755 * root STA if requested. 756 */ 757 if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) && 758 (PREQ_TFLAGS(0) & 759 ((IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF) == 760 (IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF)))) { 761 uint8_t rootmac[IEEE80211_ADDR_LEN]; 762 763 IEEE80211_ADDR_COPY(rootmac, preq->preq_origaddr); 764 rt = ieee80211_mesh_rt_find(vap, rootmac); 765 if (rt == NULL) { 766 rt = ieee80211_mesh_rt_add(vap, rootmac); 767 if (rt == NULL) { 768 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 769 "unable to add root mesh path to %s", 770 ether_sprintf(rootmac)); 771 vap->iv_stats.is_mesh_rtaddfailed++; 772 return; 773 } 774 } 775 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 776 "root mesh station @ %s", ether_sprintf(rootmac)); 777 778 /* 779 * Reply with a PREP if we don't have a path to the root 780 * or if the root sent us a proactive PREQ. 781 */ 782 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 || 783 (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) { 784 prep.prep_flags = 0; 785 prep.prep_hopcount = 0; 786 prep.prep_ttl = ms->ms_ttl; 787 IEEE80211_ADDR_COPY(prep.prep_origaddr, vap->iv_myaddr); 788 prep.prep_origseq = preq->preq_origseq; 789 prep.prep_targetseq = ++hs->hs_seq; 790 prep.prep_lifetime = preq->preq_lifetime; 791 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 792 IEEE80211_ADDR_COPY(prep.prep_targetaddr, rootmac); 793 prep.prep_targetseq = PREQ_TSEQ(0); 794 hwmp_send_prep(vap->iv_bss, vap->iv_myaddr, 795 broadcastaddr, &prep); 796 } 797 hwmp_discover(vap, rootmac, NULL); 798 return; 799 } 800 rt = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0)); 801 802 /* 803 * Forwarding and Intermediate reply for PREQs with 1 target. 804 */ 805 if (preq->preq_tcount == 1) { 806 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */ 807 808 memcpy(&ppreq, preq, sizeof(ppreq)); 809 /* 810 * We have a valid route to this node. 811 */ 812 if (rt != NULL && 813 (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 814 if (preq->preq_ttl > 1 && 815 preq->preq_hopcount < hs->hs_maxhops) { 816 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 817 "forward PREQ from %s", 818 ether_sprintf(preq->preq_origaddr)); 819 /* 820 * Propagate the original PREQ. 821 */ 822 ppreq.preq_hopcount += 1; 823 ppreq.preq_ttl -= 1; 824 ppreq.preq_metric += 825 ms->ms_pmetric->mpm_metric(ni); 826 /* 827 * Set TO and unset RF bits because we are going 828 * to send a PREP next. 829 */ 830 ppreq.preq_targets[0].target_flags |= 831 IEEE80211_MESHPREQ_TFLAGS_TO; 832 ppreq.preq_targets[0].target_flags &= 833 ~IEEE80211_MESHPREQ_TFLAGS_RF; 834 hwmp_send_preq(ni, vap->iv_myaddr, 835 broadcastaddr, &ppreq); 836 } 837 /* 838 * Check if we can send an intermediate Path Reply, 839 * i.e., Target Only bit is not set. 840 */ 841 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) { 842 struct ieee80211_meshprep_ie prep; 843 844 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 845 "intermediate reply for PREQ from %s", 846 ether_sprintf(preq->preq_origaddr)); 847 prep.prep_flags = 0; 848 prep.prep_hopcount = rt->rt_nhops + 1; 849 prep.prep_ttl = ms->ms_ttl; 850 IEEE80211_ADDR_COPY(&prep.prep_targetaddr, 851 preq->preq_origaddr); 852 prep.prep_targetseq = hrorig->hr_seq; 853 prep.prep_lifetime = preq->preq_lifetime; 854 prep.prep_metric = rt->rt_metric + 855 ms->ms_pmetric->mpm_metric(ni); 856 IEEE80211_ADDR_COPY(&prep.prep_origaddr, 857 PREQ_TADDR(0)); 858 prep.prep_origseq = hrorig->hr_seq; 859 hwmp_send_prep(ni, vap->iv_myaddr, 860 broadcastaddr, &prep); 861 } 862 /* 863 * We have no information about this path, 864 * propagate the PREQ. 865 */ 866 } else if (preq->preq_ttl > 1 && 867 preq->preq_hopcount < hs->hs_maxhops) { 868 if (rt == NULL) { 869 rt = ieee80211_mesh_rt_add(vap, PREQ_TADDR(0)); 870 if (rt == NULL) { 871 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 872 ni, "unable to add PREQ path to %s", 873 ether_sprintf(PREQ_TADDR(0))); 874 vap->iv_stats.is_mesh_rtaddfailed++; 875 return; 876 } 877 } 878 rt->rt_metric = preq->preq_metric; 879 rt->rt_lifetime = preq->preq_lifetime; 880 hrorig = IEEE80211_MESH_ROUTE_PRIV(rt, 881 struct ieee80211_hwmp_route); 882 hrorig->hr_seq = preq->preq_origseq; 883 hrorig->hr_preqid = preq->preq_id; 884 885 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 886 "forward PREQ from %s", 887 ether_sprintf(preq->preq_origaddr)); 888 ppreq.preq_hopcount += 1; 889 ppreq.preq_ttl -= 1; 890 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni); 891 hwmp_send_preq(ni, vap->iv_myaddr, broadcastaddr, 892 &ppreq); 893 } 894 } 895 896} 897#undef PREQ_TFLAGS 898#undef PREQ_TADDR 899#undef PREQ_TSEQ 900 901static int 902hwmp_send_preq(struct ieee80211_node *ni, 903 const uint8_t sa[IEEE80211_ADDR_LEN], 904 const uint8_t da[IEEE80211_ADDR_LEN], 905 struct ieee80211_meshpreq_ie *preq) 906{ 907 struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp; 908 909 /* 910 * Enforce PREQ interval. 911 */ 912 if (ratecheck(&hs->hs_lastpreq, &ieee80211_hwmp_preqminint) == 0) 913 return EALREADY; 914 getmicrouptime(&hs->hs_lastpreq); 915 916 /* 917 * mesh preq action frame format 918 * [6] da 919 * [6] sa 920 * [6] addr3 = sa 921 * [1] action 922 * [1] category 923 * [tlv] mesh path request 924 */ 925 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ; 926 return hwmp_send_action(ni, sa, da, (uint8_t *)preq, 927 sizeof(struct ieee80211_meshpreq_ie)); 928} 929 930static void 931hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni, 932 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep) 933{ 934 struct ieee80211_mesh_state *ms = vap->iv_mesh; 935 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 936 struct ieee80211_mesh_route *rt = NULL; 937 struct ieee80211_hwmp_route *hr; 938 struct ieee80211com *ic = vap->iv_ic; 939 struct ifnet *ifp = vap->iv_ifp; 940 struct mbuf *m, *next; 941 942 /* 943 * Acceptance criteria: if the corresponding PREQ was not generated 944 * by us and forwarding is disabled, discard this PREP. 945 */ 946 if (ni == vap->iv_bss || 947 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED) 948 return; 949 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) && 950 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) 951 return; 952 953 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 954 "received PREP from %s", ether_sprintf(prep->prep_origaddr)); 955 956 rt = ieee80211_mesh_rt_find(vap, prep->prep_origaddr); 957 if (rt == NULL) { 958 /* 959 * If we have no entry this could be a reply to a root PREQ. 960 */ 961 if (hs->hs_rootmode != IEEE80211_HWMP_ROOTMODE_DISABLED) { 962 rt = ieee80211_mesh_rt_add(vap, prep->prep_origaddr); 963 if (rt == NULL) { 964 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 965 ni, "unable to add PREP path to %s", 966 ether_sprintf(prep->prep_origaddr)); 967 vap->iv_stats.is_mesh_rtaddfailed++; 968 return; 969 } 970 IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2); 971 rt->rt_nhops = prep->prep_hopcount; 972 rt->rt_lifetime = prep->prep_lifetime; 973 rt->rt_metric = prep->prep_metric; 974 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; 975 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 976 "add root path to %s nhops %d metric %d (PREP)", 977 ether_sprintf(prep->prep_origaddr), 978 rt->rt_nhops, rt->rt_metric); 979 return; 980 } 981 return; 982 } 983 /* 984 * Sequence number validation. 985 */ 986 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 987 if (HWMP_SEQ_LEQ(prep->prep_origseq, hr->hr_seq)) { 988 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 989 "discard PREP from %s, old seq no %u <= %u", 990 ether_sprintf(prep->prep_origaddr), 991 prep->prep_origseq, hr->hr_seq); 992 return; 993 } 994 hr->hr_seq = prep->prep_origseq; 995 /* 996 * If it's NOT for us, propagate the PREP. 997 */ 998 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_targetaddr) && 999 prep->prep_ttl > 1 && prep->prep_hopcount < hs->hs_maxhops) { 1000 struct ieee80211_meshprep_ie pprep; /* propagated PREP */ 1001 1002 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1003 "propagate PREP from %s", 1004 ether_sprintf(prep->prep_origaddr)); 1005 1006 memcpy(&pprep, prep, sizeof(pprep)); 1007 pprep.prep_hopcount += 1; 1008 pprep.prep_ttl -= 1; 1009 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni); 1010 IEEE80211_ADDR_COPY(pprep.prep_origaddr, vap->iv_myaddr); 1011 hwmp_send_prep(ni, vap->iv_myaddr, broadcastaddr, &pprep); 1012 } 1013 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1014 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1015 /* NB: never clobber a proxy entry */; 1016 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1017 "discard PREP for %s, route is marked PROXY", 1018 ether_sprintf(prep->prep_origaddr)); 1019 vap->iv_stats.is_hwmp_proxy++; 1020 } else if (prep->prep_targetseq == hr->hr_targetseq) { 1021 /* 1022 * Check if we already have a path to this node. 1023 * If we do, check if this path reply contains a 1024 * better route. 1025 */ 1026 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 || 1027 (prep->prep_hopcount < rt->rt_nhops || 1028 prep->prep_metric < rt->rt_metric)) { 1029 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1030 "%s path to %s, hopcount %d:%d metric %d:%d", 1031 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1032 "prefer" : "update", 1033 ether_sprintf(prep->prep_origaddr), 1034 rt->rt_nhops, prep->prep_hopcount, 1035 rt->rt_metric, prep->prep_metric); 1036 IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2); 1037 rt->rt_nhops = prep->prep_hopcount; 1038 rt->rt_lifetime = prep->prep_lifetime; 1039 rt->rt_metric = prep->prep_metric; 1040 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; 1041 } else { 1042 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1043 "ignore PREP for %s, hopcount %d:%d metric %d:%d", 1044 ether_sprintf(prep->prep_origaddr), 1045 rt->rt_nhops, prep->prep_hopcount, 1046 rt->rt_metric, prep->prep_metric); 1047 } 1048 } else { 1049 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1050 "discard PREP for %s, wrong seqno %u != %u", 1051 ether_sprintf(prep->prep_origaddr), prep->prep_targetseq, 1052 hr->hr_seq); 1053 vap->iv_stats.is_hwmp_wrongseq++; 1054 } 1055 /* 1056 * Check for frames queued awaiting path discovery. 1057 * XXX probably can tell exactly and avoid remove call 1058 * NB: hash may have false matches, if so they will get 1059 * stuck back on the stageq because there won't be 1060 * a path. 1061 */ 1062 m = ieee80211_ageq_remove(&ic->ic_stageq, 1063 (struct ieee80211_node *)(uintptr_t) 1064 ieee80211_mac_hash(ic, rt->rt_dest)); 1065 for (; m != NULL; m = next) { 1066 next = m->m_nextpkt; 1067 m->m_nextpkt = NULL; 1068 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1069 "flush queued frame %p len %d", m, m->m_pkthdr.len); 1070 ifp->if_transmit(ifp, m); 1071 } 1072} 1073 1074static int 1075hwmp_send_prep(struct ieee80211_node *ni, 1076 const uint8_t sa[IEEE80211_ADDR_LEN], 1077 const uint8_t da[IEEE80211_ADDR_LEN], 1078 struct ieee80211_meshprep_ie *prep) 1079{ 1080 /* NB: there's no PREP minimum interval. */ 1081 1082 /* 1083 * mesh prep action frame format 1084 * [6] da 1085 * [6] sa 1086 * [6] addr3 = sa 1087 * [1] action 1088 * [1] category 1089 * [tlv] mesh path reply 1090 */ 1091 prep->prep_ie = IEEE80211_ELEMID_MESHPREP; 1092 return hwmp_send_action(ni, sa, da, (uint8_t *)prep, 1093 sizeof(struct ieee80211_meshprep_ie)); 1094} 1095 1096#define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1097#define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1098#define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1099#define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1100static void 1101hwmp_peerdown(struct ieee80211_node *ni) 1102{ 1103 struct ieee80211vap *vap = ni->ni_vap; 1104 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1105 struct ieee80211_meshperr_ie perr; 1106 struct ieee80211_mesh_route *rt; 1107 struct ieee80211_hwmp_route *hr; 1108 1109 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr); 1110 if (rt == NULL) 1111 return; 1112 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1113 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1114 "%s", "delete route entry"); 1115 perr.perr_ttl = ms->ms_ttl; 1116 perr.perr_ndests = 1; 1117 if (hr->hr_seq == 0) 1118 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN; 1119 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC; 1120 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest); 1121 PERR_DSEQ(0) = hr->hr_seq; 1122 PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH; 1123 /* NB: flush everything passing through peer */ 1124 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr); 1125 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &perr); 1126} 1127#undef PERR_DFLAGS 1128#undef PERR_DADDR 1129#undef PERR_DSEQ 1130#undef PERR_DRCODE 1131 1132#define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags 1133#define PERR_DADDR(n) perr->perr_dests[n].dest_addr 1134#define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 1135#define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode 1136static void 1137hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni, 1138 const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr) 1139{ 1140 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1141 struct ieee80211_mesh_route *rt = NULL; 1142 struct ieee80211_hwmp_route *hr; 1143 struct ieee80211_meshperr_ie pperr; 1144 int i, forward = 0; 1145 1146 /* 1147 * Acceptance criteria: check if we received a PERR from a 1148 * neighbor and forwarding is enabled. 1149 */ 1150 if (ni == vap->iv_bss || 1151 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED || 1152 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) 1153 return; 1154 /* 1155 * Find all routing entries that match and delete them. 1156 */ 1157 for (i = 0; i < perr->perr_ndests; i++) { 1158 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i)); 1159 if (rt == NULL) 1160 continue; 1161 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1162 if (!(PERR_DFLAGS(0) & IEEE80211_MESHPERR_DFLAGS_USN) && 1163 HWMP_SEQ_GEQ(PERR_DSEQ(i), hr->hr_seq)) { 1164 ieee80211_mesh_rt_del(vap, rt->rt_dest); 1165 ieee80211_mesh_rt_flush_peer(vap, rt->rt_dest); 1166 rt = NULL; 1167 forward = 1; 1168 } 1169 } 1170 /* 1171 * Propagate the PERR if we previously found it on our routing table. 1172 * XXX handle ndest > 1 1173 */ 1174 if (forward && perr->perr_ttl > 1) { 1175 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1176 "propagate PERR from %s", ether_sprintf(wh->i_addr2)); 1177 memcpy(&pperr, perr, sizeof(*perr)); 1178 pperr.perr_ttl--; 1179 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, 1180 &pperr); 1181 } 1182} 1183#undef PEER_DADDR 1184#undef PERR_DSEQ 1185 1186static int 1187hwmp_send_perr(struct ieee80211_node *ni, 1188 const uint8_t sa[IEEE80211_ADDR_LEN], 1189 const uint8_t da[IEEE80211_ADDR_LEN], 1190 struct ieee80211_meshperr_ie *perr) 1191{ 1192 struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp; 1193 1194 /* 1195 * Enforce PERR interval. 1196 */ 1197 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0) 1198 return EALREADY; 1199 getmicrouptime(&hs->hs_lastperr); 1200 1201 /* 1202 * mesh perr action frame format 1203 * [6] da 1204 * [6] sa 1205 * [6] addr3 = sa 1206 * [1] action 1207 * [1] category 1208 * [tlv] mesh path error 1209 */ 1210 perr->perr_ie = IEEE80211_ELEMID_MESHPERR; 1211 return hwmp_send_action(ni, sa, da, (uint8_t *)perr, 1212 sizeof(struct ieee80211_meshperr_ie)); 1213} 1214 1215static void 1216hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni, 1217 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann) 1218{ 1219 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1220 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1221 struct ieee80211_mesh_route *rt = NULL; 1222 struct ieee80211_hwmp_route *hr; 1223 struct ieee80211_meshrann_ie prann; 1224 1225 if (ni == vap->iv_bss || 1226 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED) 1227 return; 1228 1229 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr); 1230 /* 1231 * Discover the path to the root mesh STA. 1232 * If we already know it, propagate the RANN element. 1233 */ 1234 if (rt == NULL) { 1235 hwmp_discover(vap, rann->rann_addr, NULL); 1236 return; 1237 } 1238 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1239 if (HWMP_SEQ_GT(rann->rann_seq, hr->hr_seq) && rann->rann_ttl > 1 && 1240 rann->rann_hopcount < hs->hs_maxhops && 1241 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) { 1242 memcpy(&prann, rann, sizeof(prann)); 1243 prann.rann_hopcount += 1; 1244 prann.rann_ttl -= 1; 1245 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni); 1246 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, broadcastaddr, 1247 &prann); 1248 } 1249} 1250 1251static int 1252hwmp_send_rann(struct ieee80211_node *ni, 1253 const uint8_t sa[IEEE80211_ADDR_LEN], 1254 const uint8_t da[IEEE80211_ADDR_LEN], 1255 struct ieee80211_meshrann_ie *rann) 1256{ 1257 /* 1258 * mesh rann action frame format 1259 * [6] da 1260 * [6] sa 1261 * [6] addr3 = sa 1262 * [1] action 1263 * [1] category 1264 * [tlv] root annoucement 1265 */ 1266 rann->rann_ie = IEEE80211_ELEMID_MESHRANN; 1267 return hwmp_send_action(ni, sa, da, (uint8_t *)rann, 1268 sizeof(struct ieee80211_meshrann_ie)); 1269} 1270 1271#define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 1272#define PREQ_TADDR(n) preq.preq_targets[n].target_addr 1273#define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 1274static struct ieee80211_node * 1275hwmp_discover(struct ieee80211vap *vap, 1276 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m) 1277{ 1278 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1279 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1280 struct ieee80211_mesh_route *rt = NULL; 1281 struct ieee80211_hwmp_route *hr; 1282 struct ieee80211_meshpreq_ie preq; 1283 struct ieee80211_node *ni; 1284 int sendpreq = 0; 1285 1286 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1287 ("not a mesh vap, opmode %d", vap->iv_opmode)); 1288 1289 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest), 1290 ("%s: discovering self!", __func__)); 1291 1292 ni = NULL; 1293 if (!IEEE80211_IS_MULTICAST(dest)) { 1294 rt = ieee80211_mesh_rt_find(vap, dest); 1295 if (rt == NULL) { 1296 rt = ieee80211_mesh_rt_add(vap, dest); 1297 if (rt == NULL) { 1298 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 1299 ni, "unable to add discovery path to %s", 1300 ether_sprintf(dest)); 1301 vap->iv_stats.is_mesh_rtaddfailed++; 1302 goto done; 1303 } 1304 } 1305 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1306 struct ieee80211_hwmp_route); 1307 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) { 1308 if (hr->hr_targetseq == 0) 1309 hr->hr_targetseq = ++hs->hs_seq; 1310 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1311 rt->rt_lifetime = 1312 ticks_to_msecs(ieee80211_hwmp_pathtimeout); 1313 /* XXX check preq retries */ 1314 sendpreq = 1; 1315 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1316 "start path discovery (src %s)", 1317 m == NULL ? "<none>" : ether_sprintf( 1318 mtod(m, struct ether_header *)->ether_shost)); 1319 /* 1320 * Try to discover the path for this node. 1321 */ 1322 preq.preq_flags = 0; 1323 preq.preq_hopcount = 0; 1324 preq.preq_ttl = ms->ms_ttl; 1325 preq.preq_id = ++hs->hs_preqid; 1326 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1327 preq.preq_origseq = hr->hr_targetseq; 1328 preq.preq_lifetime = rt->rt_lifetime; 1329 preq.preq_metric = rt->rt_metric; 1330 preq.preq_tcount = 1; 1331 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest); 1332 PREQ_TFLAGS(0) = 0; 1333 if (ieee80211_hwmp_targetonly) 1334 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 1335 if (ieee80211_hwmp_replyforward) 1336 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_RF; 1337 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 1338 PREQ_TSEQ(0) = 0; 1339 /* XXX check return value */ 1340 hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, 1341 broadcastaddr, &preq); 1342 } 1343 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) 1344 ni = ieee80211_find_txnode(vap, rt->rt_nexthop); 1345 } else { 1346 ni = ieee80211_find_txnode(vap, dest); 1347 /* NB: if null then we leak mbuf */ 1348 KASSERT(ni != NULL, ("leak mcast frame")); 1349 return ni; 1350 } 1351done: 1352 if (ni == NULL && m != NULL) { 1353 if (sendpreq) { 1354 struct ieee80211com *ic = vap->iv_ic; 1355 /* 1356 * Queue packet for transmit when path discovery 1357 * completes. If discovery never completes the 1358 * frame will be flushed by way of the aging timer. 1359 */ 1360 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1361 "%s", "queue frame until path found"); 1362 m->m_pkthdr.rcvif = (void *)(uintptr_t) 1363 ieee80211_mac_hash(ic, dest); 1364 /* XXX age chosen randomly */ 1365 ieee80211_ageq_append(&ic->ic_stageq, m, 1366 IEEE80211_INACT_WAIT); 1367 } else { 1368 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 1369 dest, NULL, "%s", "no valid path to this node"); 1370 m_freem(m); 1371 } 1372 } 1373 return ni; 1374} 1375#undef PREQ_TFLAGS 1376#undef PREQ_TADDR 1377#undef PREQ_TSEQ 1378 1379static int 1380hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 1381{ 1382 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1383 int error; 1384 1385 if (vap->iv_opmode != IEEE80211_M_MBSS) 1386 return ENOSYS; 1387 error = 0; 1388 switch (ireq->i_type) { 1389 case IEEE80211_IOC_HWMP_ROOTMODE: 1390 ireq->i_val = hs->hs_rootmode; 1391 break; 1392 case IEEE80211_IOC_HWMP_MAXHOPS: 1393 ireq->i_val = hs->hs_maxhops; 1394 break; 1395 default: 1396 return ENOSYS; 1397 } 1398 return error; 1399} 1400IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211); 1401 1402static int 1403hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 1404{ 1405 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1406 int error; 1407 1408 if (vap->iv_opmode != IEEE80211_M_MBSS) 1409 return ENOSYS; 1410 error = 0; 1411 switch (ireq->i_type) { 1412 case IEEE80211_IOC_HWMP_ROOTMODE: 1413 if (ireq->i_val < 0 || ireq->i_val > 3) 1414 return EINVAL; 1415 hs->hs_rootmode = ireq->i_val; 1416 hwmp_rootmode_setup(vap); 1417 break; 1418 case IEEE80211_IOC_HWMP_MAXHOPS: 1419 if (ireq->i_val <= 0 || ireq->i_val > 255) 1420 return EINVAL; 1421 hs->hs_maxhops = ireq->i_val; 1422 break; 1423 default: 1424 return ENOSYS; 1425 } 1426 return error; 1427} 1428IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211); 1429