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 * $FreeBSD: head/sys/net80211/ieee80211_hwmp.c 198581 2009-10-29 12:19:10Z rpaulo $ 30 * $DragonFly$ 31 */ 32 33 /* 34 * IEEE 802.11s Hybrid Wireless Mesh Protocol, HWMP. 35 * 36 * Based on March 2009, D3.0 802.11s draft spec. 37 */ 38 #include "opt_inet.h" 39 #include "opt_wlan.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/mbuf.h> 44 #include <sys/malloc.h> 45 #include <sys/kernel.h> 46 47 #include <sys/socket.h> 48 #include <sys/sockio.h> 49 #include <sys/endian.h> 50 #include <sys/errno.h> 51 #include <sys/proc.h> 52 #include <sys/sysctl.h> 53 54 #include <net/if.h> 55 #include <net/if_media.h> 56 #include <net/if_llc.h> 57 #include <net/ethernet.h> 58 #include <net/route.h> 59 60 #include <net/bpf.h> 61 62 #include <netproto/802_11/ieee80211_var.h> 63 #include <netproto/802_11/ieee80211_action.h> 64 #include <netproto/802_11/ieee80211_input.h> 65 #include <netproto/802_11/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_callout(void *); 85 static void hwmp_rootmode_rann_callout(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 = kmalloc(sizeof(struct ieee80211_hwmp_state), M_80211_VAP, 241 M_INTWAIT | M_ZERO); 242 if (hs == NULL) { 243 kprintf("%s: couldn't alloc HWMP state\n", __func__); 244 return; 245 } 246 hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS; 247 callout_init_mp(&hs->hs_roottimer); 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_stop(&hs->hs_roottimer); 257 kfree(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_stop(&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<%6D> refcnt %d\n", 418 __func__, __LINE__, 419 ni, 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), MB_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_stop(&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_callout, vap); 590 break; 591 case IEEE80211_HWMP_ROOTMODE_RANN: 592 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint, 593 hwmp_rootmode_rann_callout, 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_callout(void *arg) 607 { 608 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 609 struct ieee80211_hwmp_state *hs; 610 struct ieee80211_mesh_state *ms; 611 struct ieee80211_meshpreq_ie preq; 612 613 wlan_serialize_enter(); 614 hs = vap->iv_hwmp; 615 ms = vap->iv_mesh; 616 617 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 618 "%s", "send broadcast PREQ"); 619 620 preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM; 621 if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL) 622 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PR; 623 if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE) 624 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP; 625 preq.preq_hopcount = 0; 626 preq.preq_ttl = ms->ms_ttl; 627 preq.preq_id = ++hs->hs_preqid; 628 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 629 preq.preq_origseq = ++hs->hs_seq; 630 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout); 631 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 632 preq.preq_tcount = 1; 633 IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr); 634 PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO | 635 IEEE80211_MESHPREQ_TFLAGS_RF; 636 PREQ_TSEQ(0) = 0; 637 vap->iv_stats.is_hwmp_rootreqs++; 638 hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &preq); 639 hwmp_rootmode_setup(vap); 640 wlan_serialize_exit(); 641 } 642 #undef PREQ_TFLAGS 643 #undef PREQ_TADDR 644 #undef PREQ_TSEQ 645 646 /* 647 * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are 648 * called when the vap is configured as a HWMP RANN root node. 649 */ 650 static void 651 hwmp_rootmode_rann_callout(void *arg) 652 { 653 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 654 struct ieee80211_hwmp_state *hs; 655 struct ieee80211_mesh_state *ms; 656 struct ieee80211_meshrann_ie rann; 657 658 wlan_serialize_enter(); 659 hs = vap->iv_hwmp; 660 ms = vap->iv_mesh; 661 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 662 "%s", "send broadcast RANN"); 663 664 rann.rann_flags = 0; 665 if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL) 666 rann.rann_flags |= IEEE80211_MESHRANN_FLAGS_PR; 667 rann.rann_hopcount = 0; 668 rann.rann_ttl = ms->ms_ttl; 669 IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr); 670 rann.rann_seq = ++hs->hs_seq; 671 rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 672 673 vap->iv_stats.is_hwmp_rootrann++; 674 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &rann); 675 hwmp_rootmode_setup(vap); 676 wlan_serialize_exit(); 677 } 678 679 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags 680 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr 681 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq 682 static void 683 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni, 684 const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq) 685 { 686 struct ieee80211_mesh_state *ms = vap->iv_mesh; 687 struct ieee80211_mesh_route *rt = NULL; 688 struct ieee80211_mesh_route *rtorig = NULL; 689 struct ieee80211_hwmp_route *hrorig; 690 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 691 struct ieee80211_meshprep_ie prep; 692 693 if (ni == vap->iv_bss || 694 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED) 695 return; 696 /* 697 * Ignore PREQs from us. Could happen because someone forward it 698 * back to us. 699 */ 700 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr)) 701 return; 702 703 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 704 "received PREQ, source %6D", preq->preq_origaddr, ":"); 705 706 /* 707 * Acceptance criteria: if the PREQ is not for us and 708 * forwarding is disabled, discard this PREQ. 709 */ 710 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) && 711 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) { 712 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 713 preq->preq_origaddr, NULL, "%s", "not accepting PREQ"); 714 return; 715 } 716 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr); 717 if (rtorig == NULL) 718 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr); 719 if (rtorig == NULL) { 720 /* XXX stat */ 721 return; 722 } 723 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route); 724 /* 725 * Sequence number validation. 726 */ 727 if (HWMP_SEQ_LEQ(preq->preq_id, hrorig->hr_preqid) && 728 HWMP_SEQ_LEQ(preq->preq_origseq, hrorig->hr_seq)) { 729 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 730 "discard PREQ from %6D, old seq no %u <= %u", 731 preq->preq_origaddr, ":", 732 preq->preq_origseq, hrorig->hr_seq); 733 return; 734 } 735 hrorig->hr_preqid = preq->preq_id; 736 hrorig->hr_seq = preq->preq_origseq; 737 738 /* 739 * Check if the PREQ is addressed to us. 740 */ 741 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) { 742 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 743 "reply to %6D", preq->preq_origaddr, ":"); 744 /* 745 * Build and send a PREP frame. 746 */ 747 prep.prep_flags = 0; 748 prep.prep_hopcount = 0; 749 prep.prep_ttl = ms->ms_ttl; 750 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr); 751 prep.prep_targetseq = ++hs->hs_seq; 752 prep.prep_lifetime = preq->preq_lifetime; 753 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 754 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr); 755 prep.prep_origseq = preq->preq_origseq; 756 hwmp_send_prep(ni, vap->iv_myaddr, wh->i_addr2, &prep); 757 /* 758 * Build the reverse path, if we don't have it already. 759 */ 760 rt = ieee80211_mesh_rt_find(vap, preq->preq_origaddr); 761 if (rt == NULL) 762 hwmp_discover(vap, preq->preq_origaddr, NULL); 763 else if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) 764 hwmp_discover(vap, rt->rt_dest, NULL); 765 return; 766 } 767 /* 768 * Proactive PREQ: reply with a proactive PREP to the 769 * root STA if requested. 770 */ 771 if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) && 772 (PREQ_TFLAGS(0) & 773 ((IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF) == 774 (IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF)))) { 775 uint8_t rootmac[IEEE80211_ADDR_LEN]; 776 777 IEEE80211_ADDR_COPY(rootmac, preq->preq_origaddr); 778 rt = ieee80211_mesh_rt_find(vap, rootmac); 779 if (rt == NULL) { 780 rt = ieee80211_mesh_rt_add(vap, rootmac); 781 if (rt == NULL) { 782 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 783 "unable to add root mesh path to %6D", 784 rootmac, ":"); 785 vap->iv_stats.is_mesh_rtaddfailed++; 786 return; 787 } 788 } 789 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 790 "root mesh station @ %6D", rootmac, ":"); 791 792 /* 793 * Reply with a PREP if we don't have a path to the root 794 * or if the root sent us a proactive PREQ. 795 */ 796 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 || 797 (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) { 798 prep.prep_flags = 0; 799 prep.prep_hopcount = 0; 800 prep.prep_ttl = ms->ms_ttl; 801 IEEE80211_ADDR_COPY(prep.prep_origaddr, rootmac); 802 prep.prep_origseq = preq->preq_origseq; 803 prep.prep_lifetime = preq->preq_lifetime; 804 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 805 IEEE80211_ADDR_COPY(prep.prep_targetaddr, 806 vap->iv_myaddr); 807 prep.prep_targetseq = ++hs->hs_seq; 808 hwmp_send_prep(vap->iv_bss, vap->iv_myaddr, 809 broadcastaddr, &prep); 810 } 811 hwmp_discover(vap, rootmac, NULL); 812 return; 813 } 814 rt = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0)); 815 816 /* 817 * Forwarding and Intermediate reply for PREQs with 1 target. 818 */ 819 if (preq->preq_tcount == 1) { 820 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */ 821 822 memcpy(&ppreq, preq, sizeof(ppreq)); 823 /* 824 * We have a valid route to this node. 825 */ 826 if (rt != NULL && 827 (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 828 if (preq->preq_ttl > 1 && 829 preq->preq_hopcount < hs->hs_maxhops) { 830 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 831 "forward PREQ from %6D", 832 preq->preq_origaddr, ":"); 833 /* 834 * Propagate the original PREQ. 835 */ 836 ppreq.preq_hopcount += 1; 837 ppreq.preq_ttl -= 1; 838 ppreq.preq_metric += 839 ms->ms_pmetric->mpm_metric(ni); 840 /* 841 * Set TO and unset RF bits because we are going 842 * to send a PREP next. 843 */ 844 ppreq.preq_targets[0].target_flags |= 845 IEEE80211_MESHPREQ_TFLAGS_TO; 846 ppreq.preq_targets[0].target_flags &= 847 ~IEEE80211_MESHPREQ_TFLAGS_RF; 848 hwmp_send_preq(ni, vap->iv_myaddr, 849 broadcastaddr, &ppreq); 850 } 851 /* 852 * Check if we can send an intermediate Path Reply, 853 * i.e., Target Only bit is not set. 854 */ 855 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) { 856 struct ieee80211_meshprep_ie prep; 857 858 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 859 "intermediate reply for PREQ from %6D", 860 preq->preq_origaddr, ":"); 861 prep.prep_flags = 0; 862 prep.prep_hopcount = rt->rt_nhops + 1; 863 prep.prep_ttl = ms->ms_ttl; 864 IEEE80211_ADDR_COPY(&prep.prep_targetaddr, 865 PREQ_TADDR(0)); 866 prep.prep_targetseq = hrorig->hr_seq; 867 prep.prep_lifetime = preq->preq_lifetime; 868 prep.prep_metric = rt->rt_metric + 869 ms->ms_pmetric->mpm_metric(ni); 870 IEEE80211_ADDR_COPY(&prep.prep_origaddr, 871 preq->preq_origaddr); 872 prep.prep_origseq = hrorig->hr_seq; 873 hwmp_send_prep(ni, vap->iv_myaddr, 874 broadcastaddr, &prep); 875 } 876 /* 877 * We have no information about this path, 878 * propagate the PREQ. 879 */ 880 } else if (preq->preq_ttl > 1 && 881 preq->preq_hopcount < hs->hs_maxhops) { 882 if (rt == NULL) { 883 rt = ieee80211_mesh_rt_add(vap, PREQ_TADDR(0)); 884 if (rt == NULL) { 885 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 886 ni, "unable to add PREQ path to %6D", 887 PREQ_TADDR(0), ":"); 888 vap->iv_stats.is_mesh_rtaddfailed++; 889 return; 890 } 891 } 892 rt->rt_metric = preq->preq_metric; 893 rt->rt_lifetime = preq->preq_lifetime; 894 hrorig = IEEE80211_MESH_ROUTE_PRIV(rt, 895 struct ieee80211_hwmp_route); 896 hrorig->hr_seq = preq->preq_origseq; 897 hrorig->hr_preqid = preq->preq_id; 898 899 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 900 "forward PREQ from %6D", 901 preq->preq_origaddr, ":"); 902 ppreq.preq_hopcount += 1; 903 ppreq.preq_ttl -= 1; 904 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni); 905 hwmp_send_preq(ni, vap->iv_myaddr, broadcastaddr, 906 &ppreq); 907 } 908 } 909 910 } 911 #undef PREQ_TFLAGS 912 #undef PREQ_TADDR 913 #undef PREQ_TSEQ 914 915 static int 916 hwmp_send_preq(struct ieee80211_node *ni, 917 const uint8_t sa[IEEE80211_ADDR_LEN], 918 const uint8_t da[IEEE80211_ADDR_LEN], 919 struct ieee80211_meshpreq_ie *preq) 920 { 921 struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp; 922 923 /* 924 * Enforce PREQ interval. 925 */ 926 if (ratecheck(&hs->hs_lastpreq, &ieee80211_hwmp_preqminint) == 0) 927 return EALREADY; 928 getmicrouptime(&hs->hs_lastpreq); 929 930 /* 931 * mesh preq action frame format 932 * [6] da 933 * [6] sa 934 * [6] addr3 = sa 935 * [1] action 936 * [1] category 937 * [tlv] mesh path request 938 */ 939 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ; 940 return hwmp_send_action(ni, sa, da, (uint8_t *)preq, 941 sizeof(struct ieee80211_meshpreq_ie)); 942 } 943 944 static void 945 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni, 946 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep) 947 { 948 struct ieee80211_mesh_state *ms = vap->iv_mesh; 949 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 950 struct ieee80211_mesh_route *rt = NULL; 951 struct ieee80211_hwmp_route *hr; 952 struct ieee80211com *ic = vap->iv_ic; 953 struct ifnet *ifp = vap->iv_ifp; 954 struct mbuf *m, *next; 955 956 /* 957 * Acceptance criteria: if the corresponding PREQ was not generated 958 * by us and forwarding is disabled, discard this PREP. 959 */ 960 if (ni == vap->iv_bss || 961 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED) 962 return; 963 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) && 964 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) 965 return; 966 967 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 968 "received PREP from %6D", prep->prep_targetaddr, ":"); 969 970 rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr); 971 if (rt == NULL) { 972 /* 973 * If we have no entry this could be a reply to a root PREQ. 974 */ 975 if (hs->hs_rootmode != IEEE80211_HWMP_ROOTMODE_DISABLED) { 976 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr); 977 if (rt == NULL) { 978 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 979 ni, "unable to add PREP path to %6D", 980 prep->prep_targetaddr, ":"); 981 vap->iv_stats.is_mesh_rtaddfailed++; 982 return; 983 } 984 IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2); 985 rt->rt_nhops = prep->prep_hopcount; 986 rt->rt_lifetime = prep->prep_lifetime; 987 rt->rt_metric = prep->prep_metric; 988 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; 989 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 990 "add root path to %6D nhops %d metric %d (PREP)", 991 prep->prep_targetaddr, ":", 992 rt->rt_nhops, rt->rt_metric); 993 return; 994 } 995 return; 996 } 997 /* 998 * Sequence number validation. 999 */ 1000 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1001 if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq)) { 1002 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1003 "discard PREP from %6D, old seq no %u <= %u", 1004 prep->prep_targetaddr, ":", 1005 prep->prep_targetseq, hr->hr_seq); 1006 return; 1007 } 1008 hr->hr_seq = prep->prep_targetseq; 1009 /* 1010 * If it's NOT for us, propagate the PREP. 1011 */ 1012 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) && 1013 prep->prep_ttl > 1 && prep->prep_hopcount < hs->hs_maxhops) { 1014 struct ieee80211_meshprep_ie pprep; /* propagated PREP */ 1015 1016 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1017 "propagate PREP from %6D", 1018 prep->prep_targetaddr, ":"); 1019 1020 memcpy(&pprep, prep, sizeof(pprep)); 1021 pprep.prep_hopcount += 1; 1022 pprep.prep_ttl -= 1; 1023 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni); 1024 IEEE80211_ADDR_COPY(pprep.prep_targetaddr, vap->iv_myaddr); 1025 hwmp_send_prep(ni, vap->iv_myaddr, broadcastaddr, &pprep); 1026 } 1027 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1028 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1029 /* NB: never clobber a proxy entry */; 1030 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1031 "discard PREP for %6D, route is marked PROXY", 1032 prep->prep_targetaddr, ":"); 1033 vap->iv_stats.is_hwmp_proxy++; 1034 } else if (prep->prep_origseq == hr->hr_origseq) { 1035 /* 1036 * Check if we already have a path to this node. 1037 * If we do, check if this path reply contains a 1038 * better route. 1039 */ 1040 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 || 1041 (prep->prep_hopcount < rt->rt_nhops || 1042 prep->prep_metric < rt->rt_metric)) { 1043 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1044 "%s path to %6D, hopcount %d:%d metric %d:%d", 1045 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1046 "prefer" : "update", 1047 prep->prep_origaddr, ":", 1048 rt->rt_nhops, prep->prep_hopcount, 1049 rt->rt_metric, prep->prep_metric); 1050 IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2); 1051 rt->rt_nhops = prep->prep_hopcount; 1052 rt->rt_lifetime = prep->prep_lifetime; 1053 rt->rt_metric = prep->prep_metric; 1054 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; 1055 } else { 1056 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1057 "ignore PREP for %6D, hopcount %d:%d metric %d:%d", 1058 prep->prep_targetaddr, ":", 1059 rt->rt_nhops, prep->prep_hopcount, 1060 rt->rt_metric, prep->prep_metric); 1061 } 1062 } else { 1063 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1064 "discard PREP for %6D, wrong seqno %u != %u", 1065 prep->prep_targetaddr, ":", prep->prep_origseq, 1066 hr->hr_seq); 1067 vap->iv_stats.is_hwmp_wrongseq++; 1068 } 1069 /* 1070 * Check for frames queued awaiting path discovery. 1071 * XXX probably can tell exactly and avoid remove call 1072 * NB: hash may have false matches, if so they will get 1073 * stuck back on the stageq because there won't be 1074 * a path. 1075 */ 1076 m = ieee80211_ageq_remove(&ic->ic_stageq, 1077 (struct ieee80211_node *)(uintptr_t) 1078 ieee80211_mac_hash(ic, rt->rt_dest)); 1079 for (; m != NULL; m = next) { 1080 next = m->m_nextpkt; 1081 m->m_nextpkt = NULL; 1082 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1083 "flush queued frame %p len %d", m, m->m_pkthdr.len); 1084 ieee80211_handoff(ifp, m); 1085 } 1086 } 1087 1088 static int 1089 hwmp_send_prep(struct ieee80211_node *ni, 1090 const uint8_t sa[IEEE80211_ADDR_LEN], 1091 const uint8_t da[IEEE80211_ADDR_LEN], 1092 struct ieee80211_meshprep_ie *prep) 1093 { 1094 /* NB: there's no PREP minimum interval. */ 1095 1096 /* 1097 * mesh prep action frame format 1098 * [6] da 1099 * [6] sa 1100 * [6] addr3 = sa 1101 * [1] action 1102 * [1] category 1103 * [tlv] mesh path reply 1104 */ 1105 prep->prep_ie = IEEE80211_ELEMID_MESHPREP; 1106 return hwmp_send_action(ni, sa, da, (uint8_t *)prep, 1107 sizeof(struct ieee80211_meshprep_ie)); 1108 } 1109 1110 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1111 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1112 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1113 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1114 static void 1115 hwmp_peerdown(struct ieee80211_node *ni) 1116 { 1117 struct ieee80211vap *vap = ni->ni_vap; 1118 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1119 struct ieee80211_meshperr_ie perr; 1120 struct ieee80211_mesh_route *rt; 1121 struct ieee80211_hwmp_route *hr; 1122 1123 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr); 1124 if (rt == NULL) 1125 return; 1126 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1127 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1128 "%s", "delete route entry"); 1129 perr.perr_ttl = ms->ms_ttl; 1130 perr.perr_ndests = 1; 1131 PERR_DFLAGS(0) = 0; 1132 if (hr->hr_seq == 0) 1133 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN; 1134 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC; 1135 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest); 1136 PERR_DSEQ(0) = hr->hr_seq; 1137 PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH; 1138 /* NB: flush everything passing through peer */ 1139 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr); 1140 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &perr); 1141 } 1142 #undef PERR_DFLAGS 1143 #undef PERR_DADDR 1144 #undef PERR_DSEQ 1145 #undef PERR_DRCODE 1146 1147 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags 1148 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr 1149 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 1150 #define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode 1151 static void 1152 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni, 1153 const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr) 1154 { 1155 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1156 struct ieee80211_mesh_route *rt = NULL; 1157 struct ieee80211_hwmp_route *hr; 1158 struct ieee80211_meshperr_ie pperr; 1159 int i, forward = 0; 1160 1161 /* 1162 * Acceptance criteria: check if we received a PERR from a 1163 * neighbor and forwarding is enabled. 1164 */ 1165 if (ni == vap->iv_bss || 1166 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED || 1167 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) 1168 return; 1169 /* 1170 * Find all routing entries that match and delete them. 1171 */ 1172 for (i = 0; i < perr->perr_ndests; i++) { 1173 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i)); 1174 if (rt == NULL) 1175 continue; 1176 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1177 if (!(PERR_DFLAGS(0) & IEEE80211_MESHPERR_DFLAGS_USN) && 1178 HWMP_SEQ_GEQ(PERR_DSEQ(i), hr->hr_seq)) { 1179 ieee80211_mesh_rt_del(vap, rt->rt_dest); 1180 ieee80211_mesh_rt_flush_peer(vap, rt->rt_dest); 1181 rt = NULL; 1182 forward = 1; 1183 } 1184 } 1185 /* 1186 * Propagate the PERR if we previously found it on our routing table. 1187 * XXX handle ndest > 1 1188 */ 1189 if (forward && perr->perr_ttl > 1) { 1190 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1191 "propagate PERR from %6D", wh->i_addr2, ":"); 1192 memcpy(&pperr, perr, sizeof(*perr)); 1193 pperr.perr_ttl--; 1194 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, 1195 &pperr); 1196 } 1197 } 1198 #undef PEER_DADDR 1199 #undef PERR_DSEQ 1200 1201 static int 1202 hwmp_send_perr(struct ieee80211_node *ni, 1203 const uint8_t sa[IEEE80211_ADDR_LEN], 1204 const uint8_t da[IEEE80211_ADDR_LEN], 1205 struct ieee80211_meshperr_ie *perr) 1206 { 1207 struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp; 1208 1209 /* 1210 * Enforce PERR interval. 1211 */ 1212 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0) 1213 return EALREADY; 1214 getmicrouptime(&hs->hs_lastperr); 1215 1216 /* 1217 * mesh perr action frame format 1218 * [6] da 1219 * [6] sa 1220 * [6] addr3 = sa 1221 * [1] action 1222 * [1] category 1223 * [tlv] mesh path error 1224 */ 1225 perr->perr_ie = IEEE80211_ELEMID_MESHPERR; 1226 return hwmp_send_action(ni, sa, da, (uint8_t *)perr, 1227 sizeof(struct ieee80211_meshperr_ie)); 1228 } 1229 1230 static void 1231 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni, 1232 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann) 1233 { 1234 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1235 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1236 struct ieee80211_mesh_route *rt = NULL; 1237 struct ieee80211_hwmp_route *hr; 1238 struct ieee80211_meshrann_ie prann; 1239 1240 if (ni == vap->iv_bss || 1241 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED || 1242 IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr)) 1243 return; 1244 1245 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr); 1246 /* 1247 * Discover the path to the root mesh STA. 1248 * If we already know it, propagate the RANN element. 1249 */ 1250 if (rt == NULL) { 1251 hwmp_discover(vap, rann->rann_addr, NULL); 1252 return; 1253 } 1254 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1255 if (HWMP_SEQ_GT(rann->rann_seq, hr->hr_seq)) { 1256 hr->hr_seq = rann->rann_seq; 1257 if (rann->rann_ttl > 1 && 1258 rann->rann_hopcount < hs->hs_maxhops && 1259 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) { 1260 memcpy(&prann, rann, sizeof(prann)); 1261 prann.rann_hopcount += 1; 1262 prann.rann_ttl -= 1; 1263 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni); 1264 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, 1265 broadcastaddr, &prann); 1266 } 1267 } 1268 } 1269 1270 static int 1271 hwmp_send_rann(struct ieee80211_node *ni, 1272 const uint8_t sa[IEEE80211_ADDR_LEN], 1273 const uint8_t da[IEEE80211_ADDR_LEN], 1274 struct ieee80211_meshrann_ie *rann) 1275 { 1276 /* 1277 * mesh rann action frame format 1278 * [6] da 1279 * [6] sa 1280 * [6] addr3 = sa 1281 * [1] action 1282 * [1] category 1283 * [tlv] root annoucement 1284 */ 1285 rann->rann_ie = IEEE80211_ELEMID_MESHRANN; 1286 return hwmp_send_action(ni, sa, da, (uint8_t *)rann, 1287 sizeof(struct ieee80211_meshrann_ie)); 1288 } 1289 1290 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 1291 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr 1292 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 1293 static struct ieee80211_node * 1294 hwmp_discover(struct ieee80211vap *vap, 1295 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m) 1296 { 1297 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1298 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1299 struct ieee80211_mesh_route *rt = NULL; 1300 struct ieee80211_hwmp_route *hr; 1301 struct ieee80211_meshpreq_ie preq; 1302 struct ieee80211_node *ni; 1303 int sendpreq = 0; 1304 1305 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1306 ("not a mesh vap, opmode %d", vap->iv_opmode)); 1307 1308 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest), 1309 ("%s: discovering self!", __func__)); 1310 1311 ni = NULL; 1312 if (!IEEE80211_IS_MULTICAST(dest)) { 1313 rt = ieee80211_mesh_rt_find(vap, dest); 1314 if (rt == NULL) { 1315 rt = ieee80211_mesh_rt_add(vap, dest); 1316 if (rt == NULL) { 1317 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 1318 ni, "unable to add discovery path to %6D", 1319 dest, ":"); 1320 vap->iv_stats.is_mesh_rtaddfailed++; 1321 goto done; 1322 } 1323 } 1324 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1325 struct ieee80211_hwmp_route); 1326 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) { 1327 if (hr->hr_origseq == 0) 1328 hr->hr_origseq = ++hs->hs_seq; 1329 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1330 rt->rt_lifetime = 1331 ticks_to_msecs(ieee80211_hwmp_pathtimeout); 1332 /* XXX check preq retries */ 1333 sendpreq = 1; 1334 if (m != NULL) { 1335 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, 1336 dest, "%s", 1337 "start path discovery (src <none>)"); 1338 } else { 1339 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, 1340 dest, 1341 "start path discovery (src %6D)", 1342 mtod(m, struct ether_header *)->ether_shost, 1343 ":"); 1344 } 1345 /* 1346 * Try to discover the path for this node. 1347 */ 1348 preq.preq_flags = 0; 1349 preq.preq_hopcount = 0; 1350 preq.preq_ttl = ms->ms_ttl; 1351 preq.preq_id = ++hs->hs_preqid; 1352 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1353 preq.preq_origseq = hr->hr_origseq; 1354 preq.preq_lifetime = rt->rt_lifetime; 1355 preq.preq_metric = rt->rt_metric; 1356 preq.preq_tcount = 1; 1357 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest); 1358 PREQ_TFLAGS(0) = 0; 1359 if (ieee80211_hwmp_targetonly) 1360 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 1361 if (ieee80211_hwmp_replyforward) 1362 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_RF; 1363 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 1364 PREQ_TSEQ(0) = 0; 1365 /* XXX check return value */ 1366 hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, 1367 broadcastaddr, &preq); 1368 } 1369 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) 1370 ni = ieee80211_find_txnode(vap, rt->rt_nexthop); 1371 } else { 1372 ni = ieee80211_find_txnode(vap, dest); 1373 /* NB: if null then we leak mbuf */ 1374 KASSERT(ni != NULL, ("leak mcast frame")); 1375 return ni; 1376 } 1377 done: 1378 if (ni == NULL && m != NULL) { 1379 if (sendpreq) { 1380 struct ieee80211com *ic = vap->iv_ic; 1381 /* 1382 * Queue packet for transmit when path discovery 1383 * completes. If discovery never completes the 1384 * frame will be flushed by way of the aging timer. 1385 */ 1386 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1387 "%s", "queue frame until path found"); 1388 m->m_pkthdr.rcvif = (void *)(uintptr_t) 1389 ieee80211_mac_hash(ic, dest); 1390 /* XXX age chosen randomly */ 1391 ieee80211_ageq_append(&ic->ic_stageq, m, 1392 IEEE80211_INACT_WAIT); 1393 } else { 1394 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 1395 dest, NULL, "%s", "no valid path to this node"); 1396 m_freem(m); 1397 } 1398 } 1399 return ni; 1400 } 1401 #undef PREQ_TFLAGS 1402 #undef PREQ_TADDR 1403 #undef PREQ_TSEQ 1404 1405 static int 1406 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 1407 { 1408 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1409 int error; 1410 1411 if (vap->iv_opmode != IEEE80211_M_MBSS) 1412 return ENOSYS; 1413 error = 0; 1414 switch (ireq->i_type) { 1415 case IEEE80211_IOC_HWMP_ROOTMODE: 1416 ireq->i_val = hs->hs_rootmode; 1417 break; 1418 case IEEE80211_IOC_HWMP_MAXHOPS: 1419 ireq->i_val = hs->hs_maxhops; 1420 break; 1421 default: 1422 return ENOSYS; 1423 } 1424 return error; 1425 } 1426 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211); 1427 1428 static int 1429 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 1430 { 1431 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1432 int error; 1433 1434 if (vap->iv_opmode != IEEE80211_M_MBSS) 1435 return ENOSYS; 1436 error = 0; 1437 switch (ireq->i_type) { 1438 case IEEE80211_IOC_HWMP_ROOTMODE: 1439 if (ireq->i_val < 0 || ireq->i_val > 3) 1440 return EINVAL; 1441 hs->hs_rootmode = ireq->i_val; 1442 hwmp_rootmode_setup(vap); 1443 break; 1444 case IEEE80211_IOC_HWMP_MAXHOPS: 1445 if (ireq->i_val <= 0 || ireq->i_val > 255) 1446 return EINVAL; 1447 hs->hs_maxhops = ireq->i_val; 1448 break; 1449 default: 1450 return ENOSYS; 1451 } 1452 return error; 1453 } 1454 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211); 1455