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("$FreeBSD$"); 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 67 static void hwmp_vattach(struct ieee80211vap *); 68 static void hwmp_vdetach(struct ieee80211vap *); 69 static int hwmp_newstate(struct ieee80211vap *, 70 enum ieee80211_state, int); 71 static 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); 75 static uint8_t * hwmp_add_meshpreq(uint8_t *, 76 const struct ieee80211_meshpreq_ie *); 77 static uint8_t * hwmp_add_meshprep(uint8_t *, 78 const struct ieee80211_meshprep_ie *); 79 static uint8_t * hwmp_add_meshperr(uint8_t *, 80 const struct ieee80211_meshperr_ie *); 81 static uint8_t * hwmp_add_meshrann(uint8_t *, 82 const struct ieee80211_meshrann_ie *); 83 static void hwmp_rootmode_setup(struct ieee80211vap *); 84 static void hwmp_rootmode_cb(void *); 85 static void hwmp_rootmode_rann_cb(void *); 86 static void hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *, 87 const struct ieee80211_frame *, 88 const struct ieee80211_meshpreq_ie *); 89 static 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 *); 93 static void hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *, 94 const struct ieee80211_frame *, 95 const struct ieee80211_meshprep_ie *); 96 static 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 *); 100 static void hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *, 101 const struct ieee80211_frame *, 102 const struct ieee80211_meshperr_ie *); 103 static 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 *); 107 static void hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *, 108 const struct ieee80211_frame *, 109 const struct ieee80211_meshrann_ie *); 110 static 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 *); 114 static struct ieee80211_node * 115 hwmp_discover(struct ieee80211vap *, 116 const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *); 117 static void hwmp_peerdown(struct ieee80211_node *); 118 119 static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 }; 120 static 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. */ 136 static const uint8_t broadcastaddr[IEEE80211_ADDR_LEN] = 137 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 138 139 typedef 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 */ 148 struct 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_origseq; /* seq. no. on our latest PREQ*/ 152 int hr_preqretries; 153 }; 154 struct 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 }; 163 164 SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0, 165 "IEEE 802.11s HWMP parameters"); 166 static int ieee80211_hwmp_targetonly = 0; 167 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLTYPE_INT | CTLFLAG_RW, 168 &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs"); 169 static int ieee80211_hwmp_replyforward = 1; 170 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, replyforward, CTLTYPE_INT | CTLFLAG_RW, 171 &ieee80211_hwmp_replyforward, 0, "Set RF bit on generated PREQs"); 172 static int ieee80211_hwmp_pathtimeout = -1; 173 SYSCTL_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)"); 176 static int ieee80211_hwmp_roottimeout = -1; 177 SYSCTL_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)"); 180 static int ieee80211_hwmp_rootint = -1; 181 SYSCTL_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)"); 184 static int ieee80211_hwmp_rannint = -1; 185 SYSCTL_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 31 190 191 static ieee80211_recv_action_func hwmp_recv_action_meshpath; 192 193 static struct ieee80211_mesh_proto_path mesh_proto_hwmp = { 194 .mpp_descr = "HWMP", 195 .mpp_ie = IEEE80211_MESHCONF_PATH_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 }; 203 SYSCTL_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)"); 206 207 208 static void 209 ieee80211_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 } 230 SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL); 231 232 void 233 hwmp_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 } 250 251 void 252 hwmp_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 } 260 261 int 262 hwmp_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 } 277 278 static int 279 hwmp_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 } 389 390 static int 391 hwmp_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 */ 491 static uint8_t * 492 hwmp_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 */ 520 static uint8_t * 521 hwmp_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 */ 540 static uint8_t * 541 hwmp_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 */ 563 static uint8_t * 564 hwmp_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 } 576 577 static void 578 hwmp_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 605 static void 606 hwmp_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 */ 645 static void 646 hwmp_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 rann.rann_flags = 0; 657 if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL) 658 rann.rann_flags |= IEEE80211_MESHRANN_FLAGS_PR; 659 rann.rann_hopcount = 0; 660 rann.rann_ttl = ms->ms_ttl; 661 IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr); 662 rann.rann_seq = ++hs->hs_seq; 663 rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 664 665 vap->iv_stats.is_hwmp_rootrann++; 666 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &rann); 667 hwmp_rootmode_setup(vap); 668 } 669 670 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags 671 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr 672 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq 673 static void 674 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni, 675 const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq) 676 { 677 struct ieee80211_mesh_state *ms = vap->iv_mesh; 678 struct ieee80211_mesh_route *rt = NULL; 679 struct ieee80211_mesh_route *rtorig = NULL; 680 struct ieee80211_hwmp_route *hrorig; 681 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 682 struct ieee80211_meshprep_ie prep; 683 684 if (ni == vap->iv_bss || 685 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED) 686 return; 687 /* 688 * Ignore PREQs from us. Could happen because someone forward it 689 * back to us. 690 */ 691 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr)) 692 return; 693 694 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 695 "received PREQ, source %s", ether_sprintf(preq->preq_origaddr)); 696 697 /* 698 * Acceptance criteria: if the PREQ is not for us and 699 * forwarding is disabled, discard this PREQ. 700 */ 701 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) && 702 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) { 703 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 704 preq->preq_origaddr, NULL, "%s", "not accepting PREQ"); 705 return; 706 } 707 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr); 708 if (rtorig == NULL) 709 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr); 710 if (rtorig == NULL) { 711 /* XXX stat */ 712 return; 713 } 714 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route); 715 /* 716 * Sequence number validation. 717 */ 718 if (HWMP_SEQ_LEQ(preq->preq_id, hrorig->hr_preqid) && 719 HWMP_SEQ_LEQ(preq->preq_origseq, hrorig->hr_seq)) { 720 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 721 "discard PREQ from %s, old seq no %u <= %u", 722 ether_sprintf(preq->preq_origaddr), 723 preq->preq_origseq, hrorig->hr_seq); 724 return; 725 } 726 hrorig->hr_preqid = preq->preq_id; 727 hrorig->hr_seq = preq->preq_origseq; 728 729 /* 730 * Check if the PREQ is addressed to us. 731 */ 732 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) { 733 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 734 "reply to %s", ether_sprintf(preq->preq_origaddr)); 735 /* 736 * Build and send a PREP frame. 737 */ 738 prep.prep_flags = 0; 739 prep.prep_hopcount = 0; 740 prep.prep_ttl = ms->ms_ttl; 741 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr); 742 prep.prep_targetseq = ++hs->hs_seq; 743 prep.prep_lifetime = preq->preq_lifetime; 744 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 745 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr); 746 prep.prep_origseq = preq->preq_origseq; 747 hwmp_send_prep(ni, vap->iv_myaddr, wh->i_addr2, &prep); 748 /* 749 * Build the reverse path, if we don't have it already. 750 */ 751 rt = ieee80211_mesh_rt_find(vap, preq->preq_origaddr); 752 if (rt == NULL) 753 hwmp_discover(vap, preq->preq_origaddr, NULL); 754 else if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) 755 hwmp_discover(vap, rt->rt_dest, NULL); 756 return; 757 } 758 /* 759 * Proactive PREQ: reply with a proactive PREP to the 760 * root STA if requested. 761 */ 762 if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) && 763 (PREQ_TFLAGS(0) & 764 ((IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF) == 765 (IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF)))) { 766 uint8_t rootmac[IEEE80211_ADDR_LEN]; 767 768 IEEE80211_ADDR_COPY(rootmac, preq->preq_origaddr); 769 rt = ieee80211_mesh_rt_find(vap, rootmac); 770 if (rt == NULL) { 771 rt = ieee80211_mesh_rt_add(vap, rootmac); 772 if (rt == NULL) { 773 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 774 "unable to add root mesh path to %s", 775 ether_sprintf(rootmac)); 776 vap->iv_stats.is_mesh_rtaddfailed++; 777 return; 778 } 779 } 780 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 781 "root mesh station @ %s", ether_sprintf(rootmac)); 782 783 /* 784 * Reply with a PREP if we don't have a path to the root 785 * or if the root sent us a proactive PREQ. 786 */ 787 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 || 788 (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) { 789 prep.prep_flags = 0; 790 prep.prep_hopcount = 0; 791 prep.prep_ttl = ms->ms_ttl; 792 IEEE80211_ADDR_COPY(prep.prep_origaddr, rootmac); 793 prep.prep_origseq = preq->preq_origseq; 794 prep.prep_lifetime = preq->preq_lifetime; 795 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 796 IEEE80211_ADDR_COPY(prep.prep_targetaddr, 797 vap->iv_myaddr); 798 prep.prep_targetseq = ++hs->hs_seq; 799 hwmp_send_prep(vap->iv_bss, vap->iv_myaddr, 800 broadcastaddr, &prep); 801 } 802 hwmp_discover(vap, rootmac, NULL); 803 return; 804 } 805 rt = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0)); 806 807 /* 808 * Forwarding and Intermediate reply for PREQs with 1 target. 809 */ 810 if (preq->preq_tcount == 1) { 811 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */ 812 813 memcpy(&ppreq, preq, sizeof(ppreq)); 814 /* 815 * We have a valid route to this node. 816 */ 817 if (rt != NULL && 818 (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 819 if (preq->preq_ttl > 1 && 820 preq->preq_hopcount < hs->hs_maxhops) { 821 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 822 "forward PREQ from %s", 823 ether_sprintf(preq->preq_origaddr)); 824 /* 825 * Propagate the original PREQ. 826 */ 827 ppreq.preq_hopcount += 1; 828 ppreq.preq_ttl -= 1; 829 ppreq.preq_metric += 830 ms->ms_pmetric->mpm_metric(ni); 831 /* 832 * Set TO and unset RF bits because we are going 833 * to send a PREP next. 834 */ 835 ppreq.preq_targets[0].target_flags |= 836 IEEE80211_MESHPREQ_TFLAGS_TO; 837 ppreq.preq_targets[0].target_flags &= 838 ~IEEE80211_MESHPREQ_TFLAGS_RF; 839 hwmp_send_preq(ni, vap->iv_myaddr, 840 broadcastaddr, &ppreq); 841 } 842 /* 843 * Check if we can send an intermediate Path Reply, 844 * i.e., Target Only bit is not set. 845 */ 846 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) { 847 struct ieee80211_meshprep_ie prep; 848 849 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 850 "intermediate reply for PREQ from %s", 851 ether_sprintf(preq->preq_origaddr)); 852 prep.prep_flags = 0; 853 prep.prep_hopcount = rt->rt_nhops + 1; 854 prep.prep_ttl = ms->ms_ttl; 855 IEEE80211_ADDR_COPY(&prep.prep_targetaddr, 856 PREQ_TADDR(0)); 857 prep.prep_targetseq = hrorig->hr_seq; 858 prep.prep_lifetime = preq->preq_lifetime; 859 prep.prep_metric = rt->rt_metric + 860 ms->ms_pmetric->mpm_metric(ni); 861 IEEE80211_ADDR_COPY(&prep.prep_origaddr, 862 preq->preq_origaddr); 863 prep.prep_origseq = hrorig->hr_seq; 864 hwmp_send_prep(ni, vap->iv_myaddr, 865 broadcastaddr, &prep); 866 } 867 /* 868 * We have no information about this path, 869 * propagate the PREQ. 870 */ 871 } else if (preq->preq_ttl > 1 && 872 preq->preq_hopcount < hs->hs_maxhops) { 873 if (rt == NULL) { 874 rt = ieee80211_mesh_rt_add(vap, PREQ_TADDR(0)); 875 if (rt == NULL) { 876 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 877 ni, "unable to add PREQ path to %s", 878 ether_sprintf(PREQ_TADDR(0))); 879 vap->iv_stats.is_mesh_rtaddfailed++; 880 return; 881 } 882 } 883 rt->rt_metric = preq->preq_metric; 884 rt->rt_lifetime = preq->preq_lifetime; 885 hrorig = IEEE80211_MESH_ROUTE_PRIV(rt, 886 struct ieee80211_hwmp_route); 887 hrorig->hr_seq = preq->preq_origseq; 888 hrorig->hr_preqid = preq->preq_id; 889 890 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 891 "forward PREQ from %s", 892 ether_sprintf(preq->preq_origaddr)); 893 ppreq.preq_hopcount += 1; 894 ppreq.preq_ttl -= 1; 895 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni); 896 hwmp_send_preq(ni, vap->iv_myaddr, broadcastaddr, 897 &ppreq); 898 } 899 } 900 901 } 902 #undef PREQ_TFLAGS 903 #undef PREQ_TADDR 904 #undef PREQ_TSEQ 905 906 static int 907 hwmp_send_preq(struct ieee80211_node *ni, 908 const uint8_t sa[IEEE80211_ADDR_LEN], 909 const uint8_t da[IEEE80211_ADDR_LEN], 910 struct ieee80211_meshpreq_ie *preq) 911 { 912 struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp; 913 914 /* 915 * Enforce PREQ interval. 916 */ 917 if (ratecheck(&hs->hs_lastpreq, &ieee80211_hwmp_preqminint) == 0) 918 return EALREADY; 919 getmicrouptime(&hs->hs_lastpreq); 920 921 /* 922 * mesh preq action frame format 923 * [6] da 924 * [6] sa 925 * [6] addr3 = sa 926 * [1] action 927 * [1] category 928 * [tlv] mesh path request 929 */ 930 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ; 931 return hwmp_send_action(ni, sa, da, (uint8_t *)preq, 932 sizeof(struct ieee80211_meshpreq_ie)); 933 } 934 935 static void 936 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni, 937 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep) 938 { 939 struct ieee80211_mesh_state *ms = vap->iv_mesh; 940 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 941 struct ieee80211_mesh_route *rt = NULL; 942 struct ieee80211_hwmp_route *hr; 943 struct ieee80211com *ic = vap->iv_ic; 944 struct ifnet *ifp = vap->iv_ifp; 945 struct mbuf *m, *next; 946 947 /* 948 * Acceptance criteria: if the corresponding PREQ was not generated 949 * by us and forwarding is disabled, discard this PREP. 950 */ 951 if (ni == vap->iv_bss || 952 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED) 953 return; 954 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) && 955 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) 956 return; 957 958 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 959 "received PREP from %s", ether_sprintf(prep->prep_targetaddr)); 960 961 rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr); 962 if (rt == NULL) { 963 /* 964 * If we have no entry this could be a reply to a root PREQ. 965 */ 966 if (hs->hs_rootmode != IEEE80211_HWMP_ROOTMODE_DISABLED) { 967 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr); 968 if (rt == NULL) { 969 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 970 ni, "unable to add PREP path to %s", 971 ether_sprintf(prep->prep_targetaddr)); 972 vap->iv_stats.is_mesh_rtaddfailed++; 973 return; 974 } 975 IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2); 976 rt->rt_nhops = prep->prep_hopcount; 977 rt->rt_lifetime = prep->prep_lifetime; 978 rt->rt_metric = prep->prep_metric; 979 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; 980 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 981 "add root path to %s nhops %d metric %d (PREP)", 982 ether_sprintf(prep->prep_targetaddr), 983 rt->rt_nhops, rt->rt_metric); 984 return; 985 } 986 return; 987 } 988 /* 989 * Sequence number validation. 990 */ 991 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 992 if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq)) { 993 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 994 "discard PREP from %s, old seq no %u <= %u", 995 ether_sprintf(prep->prep_targetaddr), 996 prep->prep_targetseq, hr->hr_seq); 997 return; 998 } 999 hr->hr_seq = prep->prep_targetseq; 1000 /* 1001 * If it's NOT for us, propagate the PREP. 1002 */ 1003 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) && 1004 prep->prep_ttl > 1 && prep->prep_hopcount < hs->hs_maxhops) { 1005 struct ieee80211_meshprep_ie pprep; /* propagated PREP */ 1006 1007 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1008 "propagate PREP from %s", 1009 ether_sprintf(prep->prep_targetaddr)); 1010 1011 memcpy(&pprep, prep, sizeof(pprep)); 1012 pprep.prep_hopcount += 1; 1013 pprep.prep_ttl -= 1; 1014 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni); 1015 IEEE80211_ADDR_COPY(pprep.prep_targetaddr, vap->iv_myaddr); 1016 hwmp_send_prep(ni, vap->iv_myaddr, broadcastaddr, &pprep); 1017 } 1018 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1019 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1020 /* NB: never clobber a proxy entry */; 1021 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1022 "discard PREP for %s, route is marked PROXY", 1023 ether_sprintf(prep->prep_targetaddr)); 1024 vap->iv_stats.is_hwmp_proxy++; 1025 } else if (prep->prep_origseq == hr->hr_origseq) { 1026 /* 1027 * Check if we already have a path to this node. 1028 * If we do, check if this path reply contains a 1029 * better route. 1030 */ 1031 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 || 1032 (prep->prep_hopcount < rt->rt_nhops || 1033 prep->prep_metric < rt->rt_metric)) { 1034 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1035 "%s path to %s, hopcount %d:%d metric %d:%d", 1036 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1037 "prefer" : "update", 1038 ether_sprintf(prep->prep_origaddr), 1039 rt->rt_nhops, prep->prep_hopcount, 1040 rt->rt_metric, prep->prep_metric); 1041 IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2); 1042 rt->rt_nhops = prep->prep_hopcount; 1043 rt->rt_lifetime = prep->prep_lifetime; 1044 rt->rt_metric = prep->prep_metric; 1045 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; 1046 } else { 1047 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1048 "ignore PREP for %s, hopcount %d:%d metric %d:%d", 1049 ether_sprintf(prep->prep_targetaddr), 1050 rt->rt_nhops, prep->prep_hopcount, 1051 rt->rt_metric, prep->prep_metric); 1052 } 1053 } else { 1054 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1055 "discard PREP for %s, wrong seqno %u != %u", 1056 ether_sprintf(prep->prep_targetaddr), prep->prep_origseq, 1057 hr->hr_seq); 1058 vap->iv_stats.is_hwmp_wrongseq++; 1059 } 1060 /* 1061 * Check for frames queued awaiting path discovery. 1062 * XXX probably can tell exactly and avoid remove call 1063 * NB: hash may have false matches, if so they will get 1064 * stuck back on the stageq because there won't be 1065 * a path. 1066 */ 1067 m = ieee80211_ageq_remove(&ic->ic_stageq, 1068 (struct ieee80211_node *)(uintptr_t) 1069 ieee80211_mac_hash(ic, rt->rt_dest)); 1070 for (; m != NULL; m = next) { 1071 next = m->m_nextpkt; 1072 m->m_nextpkt = NULL; 1073 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1074 "flush queued frame %p len %d", m, m->m_pkthdr.len); 1075 ifp->if_transmit(ifp, m); 1076 } 1077 } 1078 1079 static int 1080 hwmp_send_prep(struct ieee80211_node *ni, 1081 const uint8_t sa[IEEE80211_ADDR_LEN], 1082 const uint8_t da[IEEE80211_ADDR_LEN], 1083 struct ieee80211_meshprep_ie *prep) 1084 { 1085 /* NB: there's no PREP minimum interval. */ 1086 1087 /* 1088 * mesh prep action frame format 1089 * [6] da 1090 * [6] sa 1091 * [6] addr3 = sa 1092 * [1] action 1093 * [1] category 1094 * [tlv] mesh path reply 1095 */ 1096 prep->prep_ie = IEEE80211_ELEMID_MESHPREP; 1097 return hwmp_send_action(ni, sa, da, (uint8_t *)prep, 1098 sizeof(struct ieee80211_meshprep_ie)); 1099 } 1100 1101 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1102 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1103 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1104 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1105 static void 1106 hwmp_peerdown(struct ieee80211_node *ni) 1107 { 1108 struct ieee80211vap *vap = ni->ni_vap; 1109 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1110 struct ieee80211_meshperr_ie perr; 1111 struct ieee80211_mesh_route *rt; 1112 struct ieee80211_hwmp_route *hr; 1113 1114 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr); 1115 if (rt == NULL) 1116 return; 1117 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1118 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1119 "%s", "delete route entry"); 1120 perr.perr_ttl = ms->ms_ttl; 1121 perr.perr_ndests = 1; 1122 PERR_DFLAGS(0) = 0; 1123 if (hr->hr_seq == 0) 1124 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN; 1125 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC; 1126 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest); 1127 PERR_DSEQ(0) = hr->hr_seq; 1128 PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH; 1129 /* NB: flush everything passing through peer */ 1130 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr); 1131 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &perr); 1132 } 1133 #undef PERR_DFLAGS 1134 #undef PERR_DADDR 1135 #undef PERR_DSEQ 1136 #undef PERR_DRCODE 1137 1138 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags 1139 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr 1140 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 1141 #define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode 1142 static void 1143 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni, 1144 const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr) 1145 { 1146 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1147 struct ieee80211_mesh_route *rt = NULL; 1148 struct ieee80211_hwmp_route *hr; 1149 struct ieee80211_meshperr_ie pperr; 1150 int i, forward = 0; 1151 1152 /* 1153 * Acceptance criteria: check if we received a PERR from a 1154 * neighbor and forwarding is enabled. 1155 */ 1156 if (ni == vap->iv_bss || 1157 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED || 1158 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) 1159 return; 1160 /* 1161 * Find all routing entries that match and delete them. 1162 */ 1163 for (i = 0; i < perr->perr_ndests; i++) { 1164 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i)); 1165 if (rt == NULL) 1166 continue; 1167 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1168 if (!(PERR_DFLAGS(0) & IEEE80211_MESHPERR_DFLAGS_USN) && 1169 HWMP_SEQ_GEQ(PERR_DSEQ(i), hr->hr_seq)) { 1170 ieee80211_mesh_rt_del(vap, rt->rt_dest); 1171 ieee80211_mesh_rt_flush_peer(vap, rt->rt_dest); 1172 rt = NULL; 1173 forward = 1; 1174 } 1175 } 1176 /* 1177 * Propagate the PERR if we previously found it on our routing table. 1178 * XXX handle ndest > 1 1179 */ 1180 if (forward && perr->perr_ttl > 1) { 1181 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1182 "propagate PERR from %s", ether_sprintf(wh->i_addr2)); 1183 memcpy(&pperr, perr, sizeof(*perr)); 1184 pperr.perr_ttl--; 1185 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, 1186 &pperr); 1187 } 1188 } 1189 #undef PEER_DADDR 1190 #undef PERR_DSEQ 1191 1192 static int 1193 hwmp_send_perr(struct ieee80211_node *ni, 1194 const uint8_t sa[IEEE80211_ADDR_LEN], 1195 const uint8_t da[IEEE80211_ADDR_LEN], 1196 struct ieee80211_meshperr_ie *perr) 1197 { 1198 struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp; 1199 1200 /* 1201 * Enforce PERR interval. 1202 */ 1203 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0) 1204 return EALREADY; 1205 getmicrouptime(&hs->hs_lastperr); 1206 1207 /* 1208 * mesh perr action frame format 1209 * [6] da 1210 * [6] sa 1211 * [6] addr3 = sa 1212 * [1] action 1213 * [1] category 1214 * [tlv] mesh path error 1215 */ 1216 perr->perr_ie = IEEE80211_ELEMID_MESHPERR; 1217 return hwmp_send_action(ni, sa, da, (uint8_t *)perr, 1218 sizeof(struct ieee80211_meshperr_ie)); 1219 } 1220 1221 static void 1222 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni, 1223 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann) 1224 { 1225 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1226 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1227 struct ieee80211_mesh_route *rt = NULL; 1228 struct ieee80211_hwmp_route *hr; 1229 struct ieee80211_meshrann_ie prann; 1230 1231 if (ni == vap->iv_bss || 1232 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED || 1233 IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr)) 1234 return; 1235 1236 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr); 1237 /* 1238 * Discover the path to the root mesh STA. 1239 * If we already know it, propagate the RANN element. 1240 */ 1241 if (rt == NULL) { 1242 hwmp_discover(vap, rann->rann_addr, NULL); 1243 return; 1244 } 1245 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1246 if (HWMP_SEQ_GT(rann->rann_seq, hr->hr_seq)) { 1247 hr->hr_seq = rann->rann_seq; 1248 if (rann->rann_ttl > 1 && 1249 rann->rann_hopcount < hs->hs_maxhops && 1250 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) { 1251 memcpy(&prann, rann, sizeof(prann)); 1252 prann.rann_hopcount += 1; 1253 prann.rann_ttl -= 1; 1254 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni); 1255 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, 1256 broadcastaddr, &prann); 1257 } 1258 } 1259 } 1260 1261 static int 1262 hwmp_send_rann(struct ieee80211_node *ni, 1263 const uint8_t sa[IEEE80211_ADDR_LEN], 1264 const uint8_t da[IEEE80211_ADDR_LEN], 1265 struct ieee80211_meshrann_ie *rann) 1266 { 1267 /* 1268 * mesh rann action frame format 1269 * [6] da 1270 * [6] sa 1271 * [6] addr3 = sa 1272 * [1] action 1273 * [1] category 1274 * [tlv] root annoucement 1275 */ 1276 rann->rann_ie = IEEE80211_ELEMID_MESHRANN; 1277 return hwmp_send_action(ni, sa, da, (uint8_t *)rann, 1278 sizeof(struct ieee80211_meshrann_ie)); 1279 } 1280 1281 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 1282 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr 1283 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 1284 static struct ieee80211_node * 1285 hwmp_discover(struct ieee80211vap *vap, 1286 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m) 1287 { 1288 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1289 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1290 struct ieee80211_mesh_route *rt = NULL; 1291 struct ieee80211_hwmp_route *hr; 1292 struct ieee80211_meshpreq_ie preq; 1293 struct ieee80211_node *ni; 1294 int sendpreq = 0; 1295 1296 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1297 ("not a mesh vap, opmode %d", vap->iv_opmode)); 1298 1299 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest), 1300 ("%s: discovering self!", __func__)); 1301 1302 ni = NULL; 1303 if (!IEEE80211_IS_MULTICAST(dest)) { 1304 rt = ieee80211_mesh_rt_find(vap, dest); 1305 if (rt == NULL) { 1306 rt = ieee80211_mesh_rt_add(vap, dest); 1307 if (rt == NULL) { 1308 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 1309 ni, "unable to add discovery path to %s", 1310 ether_sprintf(dest)); 1311 vap->iv_stats.is_mesh_rtaddfailed++; 1312 goto done; 1313 } 1314 } 1315 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1316 struct ieee80211_hwmp_route); 1317 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) { 1318 if (hr->hr_origseq == 0) 1319 hr->hr_origseq = ++hs->hs_seq; 1320 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1321 rt->rt_lifetime = 1322 ticks_to_msecs(ieee80211_hwmp_pathtimeout); 1323 /* XXX check preq retries */ 1324 sendpreq = 1; 1325 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1326 "start path discovery (src %s)", 1327 m == NULL ? "<none>" : ether_sprintf( 1328 mtod(m, struct ether_header *)->ether_shost)); 1329 /* 1330 * Try to discover the path for this node. 1331 */ 1332 preq.preq_flags = 0; 1333 preq.preq_hopcount = 0; 1334 preq.preq_ttl = ms->ms_ttl; 1335 preq.preq_id = ++hs->hs_preqid; 1336 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1337 preq.preq_origseq = hr->hr_origseq; 1338 preq.preq_lifetime = rt->rt_lifetime; 1339 preq.preq_metric = rt->rt_metric; 1340 preq.preq_tcount = 1; 1341 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest); 1342 PREQ_TFLAGS(0) = 0; 1343 if (ieee80211_hwmp_targetonly) 1344 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 1345 if (ieee80211_hwmp_replyforward) 1346 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_RF; 1347 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 1348 PREQ_TSEQ(0) = 0; 1349 /* XXX check return value */ 1350 hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, 1351 broadcastaddr, &preq); 1352 } 1353 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) 1354 ni = ieee80211_find_txnode(vap, rt->rt_nexthop); 1355 } else { 1356 ni = ieee80211_find_txnode(vap, dest); 1357 /* NB: if null then we leak mbuf */ 1358 KASSERT(ni != NULL, ("leak mcast frame")); 1359 return ni; 1360 } 1361 done: 1362 if (ni == NULL && m != NULL) { 1363 if (sendpreq) { 1364 struct ieee80211com *ic = vap->iv_ic; 1365 /* 1366 * Queue packet for transmit when path discovery 1367 * completes. If discovery never completes the 1368 * frame will be flushed by way of the aging timer. 1369 */ 1370 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1371 "%s", "queue frame until path found"); 1372 m->m_pkthdr.rcvif = (void *)(uintptr_t) 1373 ieee80211_mac_hash(ic, dest); 1374 /* XXX age chosen randomly */ 1375 ieee80211_ageq_append(&ic->ic_stageq, m, 1376 IEEE80211_INACT_WAIT); 1377 } else { 1378 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 1379 dest, NULL, "%s", "no valid path to this node"); 1380 m_freem(m); 1381 } 1382 } 1383 return ni; 1384 } 1385 #undef PREQ_TFLAGS 1386 #undef PREQ_TADDR 1387 #undef PREQ_TSEQ 1388 1389 static int 1390 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 1391 { 1392 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1393 int error; 1394 1395 if (vap->iv_opmode != IEEE80211_M_MBSS) 1396 return ENOSYS; 1397 error = 0; 1398 switch (ireq->i_type) { 1399 case IEEE80211_IOC_HWMP_ROOTMODE: 1400 ireq->i_val = hs->hs_rootmode; 1401 break; 1402 case IEEE80211_IOC_HWMP_MAXHOPS: 1403 ireq->i_val = hs->hs_maxhops; 1404 break; 1405 default: 1406 return ENOSYS; 1407 } 1408 return error; 1409 } 1410 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211); 1411 1412 static int 1413 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 1414 { 1415 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1416 int error; 1417 1418 if (vap->iv_opmode != IEEE80211_M_MBSS) 1419 return ENOSYS; 1420 error = 0; 1421 switch (ireq->i_type) { 1422 case IEEE80211_IOC_HWMP_ROOTMODE: 1423 if (ireq->i_val < 0 || ireq->i_val > 3) 1424 return EINVAL; 1425 hs->hs_rootmode = ireq->i_val; 1426 hwmp_rootmode_setup(vap); 1427 break; 1428 case IEEE80211_IOC_HWMP_MAXHOPS: 1429 if (ireq->i_val <= 0 || ireq->i_val > 255) 1430 return EINVAL; 1431 hs->hs_maxhops = ireq->i_val; 1432 break; 1433 default: 1434 return ENOSYS; 1435 } 1436 return error; 1437 } 1438 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211); 1439