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