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