1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2009 The FreeBSD Foundation 5 * 6 * This software was developed by Rui Paulo under sponsorship from the 7 * FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * IEEE 802.11s Hybrid Wireless Mesh Protocol, HWMP. 33 * 34 * Based on March 2009, D3.0 802.11s draft spec. 35 */ 36 #include "opt_inet.h" 37 #include "opt_wlan.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/mbuf.h> 42 #include <sys/malloc.h> 43 #include <sys/kernel.h> 44 45 #include <sys/socket.h> 46 #include <sys/sockio.h> 47 #include <sys/endian.h> 48 #include <sys/errno.h> 49 #include <sys/proc.h> 50 #include <sys/sysctl.h> 51 52 #include <net/if.h> 53 #include <net/if_media.h> 54 #include <net/if_llc.h> 55 #include <net/ethernet.h> 56 57 #include <net/bpf.h> 58 59 #include <net80211/ieee80211_var.h> 60 #include <net80211/ieee80211_action.h> 61 #include <net80211/ieee80211_input.h> 62 #include <net80211/ieee80211_mesh.h> 63 64 static void hwmp_vattach(struct ieee80211vap *); 65 static void hwmp_vdetach(struct ieee80211vap *); 66 static int hwmp_newstate(struct ieee80211vap *, 67 enum ieee80211_state, int); 68 static int hwmp_send_action(struct ieee80211vap *, 69 const uint8_t [IEEE80211_ADDR_LEN], 70 uint8_t *, size_t); 71 static uint8_t * hwmp_add_meshpreq(uint8_t *, 72 const struct ieee80211_meshpreq_ie *); 73 static uint8_t * hwmp_add_meshprep(uint8_t *, 74 const struct ieee80211_meshprep_ie *); 75 static uint8_t * hwmp_add_meshperr(uint8_t *, 76 const struct ieee80211_meshperr_ie *); 77 static uint8_t * hwmp_add_meshrann(uint8_t *, 78 const struct ieee80211_meshrann_ie *); 79 static void hwmp_rootmode_setup(struct ieee80211vap *); 80 static void hwmp_rootmode_cb(void *); 81 static void hwmp_rootmode_rann_cb(void *); 82 static void hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *, 83 const struct ieee80211_frame *, 84 const struct ieee80211_meshpreq_ie *); 85 static int hwmp_send_preq(struct ieee80211vap *, 86 const uint8_t [IEEE80211_ADDR_LEN], 87 struct ieee80211_meshpreq_ie *, 88 struct timeval *, struct timeval *); 89 static void hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *, 90 const struct ieee80211_frame *, 91 const struct ieee80211_meshprep_ie *); 92 static int hwmp_send_prep(struct ieee80211vap *, 93 const uint8_t [IEEE80211_ADDR_LEN], 94 struct ieee80211_meshprep_ie *); 95 static void hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *, 96 const struct ieee80211_frame *, 97 const struct ieee80211_meshperr_ie *); 98 static int hwmp_send_perr(struct ieee80211vap *, 99 const uint8_t [IEEE80211_ADDR_LEN], 100 struct ieee80211_meshperr_ie *); 101 static void hwmp_senderror(struct ieee80211vap *, 102 const uint8_t [IEEE80211_ADDR_LEN], 103 struct ieee80211_mesh_route *, int); 104 static void hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *, 105 const struct ieee80211_frame *, 106 const struct ieee80211_meshrann_ie *); 107 static int hwmp_send_rann(struct ieee80211vap *, 108 const uint8_t [IEEE80211_ADDR_LEN], 109 struct ieee80211_meshrann_ie *); 110 static struct ieee80211_node * 111 hwmp_discover(struct ieee80211vap *, 112 const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *); 113 static void hwmp_peerdown(struct ieee80211_node *); 114 115 static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 }; 116 static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 }; 117 118 /* NB: the Target Address set in a Proactive PREQ is the broadcast address. */ 119 static const uint8_t broadcastaddr[IEEE80211_ADDR_LEN] = 120 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 121 122 typedef uint32_t ieee80211_hwmp_seq; 123 #define HWMP_SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0) 124 #define HWMP_SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0) 125 #define HWMP_SEQ_EQ(a, b) ((int32_t)((a)-(b)) == 0) 126 #define HWMP_SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0) 127 128 #define HWMP_SEQ_MAX(a, b) (a > b ? a : b) 129 130 /* 131 * Private extension of ieee80211_mesh_route. 132 */ 133 struct ieee80211_hwmp_route { 134 ieee80211_hwmp_seq hr_seq; /* last HWMP seq seen from dst*/ 135 ieee80211_hwmp_seq hr_preqid; /* last PREQ ID seen from dst */ 136 ieee80211_hwmp_seq hr_origseq; /* seq. no. on our latest PREQ*/ 137 struct timeval hr_lastpreq; /* last time we sent a PREQ */ 138 struct timeval hr_lastrootconf; /* last sent PREQ root conf */ 139 int hr_preqretries; /* number of discoveries */ 140 int hr_lastdiscovery; /* last discovery in ticks */ 141 }; 142 struct ieee80211_hwmp_state { 143 ieee80211_hwmp_seq hs_seq; /* next seq to be used */ 144 ieee80211_hwmp_seq hs_preqid; /* next PREQ ID to be used */ 145 int hs_rootmode; /* proactive HWMP */ 146 struct timeval hs_lastperr; /* last time we sent a PERR */ 147 struct callout hs_roottimer; 148 uint8_t hs_maxhops; /* max hop count */ 149 }; 150 151 static SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 152 "IEEE 802.11s HWMP parameters"); 153 static int ieee80211_hwmp_targetonly = 0; 154 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLFLAG_RW, 155 &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs"); 156 static int ieee80211_hwmp_pathtimeout = -1; 157 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, 158 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 159 &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I", 160 "path entry lifetime (ms)"); 161 static int ieee80211_hwmp_maxpreq_retries = -1; 162 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, maxpreq_retries, 163 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 164 &ieee80211_hwmp_maxpreq_retries, 0, ieee80211_sysctl_msecs_ticks, "I", 165 "maximum number of preq retries"); 166 static int ieee80211_hwmp_net_diameter_traversaltime = -1; 167 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, net_diameter_traversal_time, 168 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 169 &ieee80211_hwmp_net_diameter_traversaltime, 0, 170 ieee80211_sysctl_msecs_ticks, "I", 171 "estimate traversal time across the MBSS (ms)"); 172 static int ieee80211_hwmp_roottimeout = -1; 173 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, 174 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 175 &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I", 176 "root PREQ timeout (ms)"); 177 static int ieee80211_hwmp_rootint = -1; 178 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, 179 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 180 &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I", 181 "root interval (ms)"); 182 static int ieee80211_hwmp_rannint = -1; 183 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, 184 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 185 &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I", 186 "root announcement interval (ms)"); 187 static struct timeval ieee80211_hwmp_rootconfint = { 0, 0 }; 188 static int ieee80211_hwmp_rootconfint_internal = -1; 189 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootconfint, 190 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 191 &ieee80211_hwmp_rootconfint_internal, 0, ieee80211_sysctl_msecs_ticks, "I", 192 "root confirmation interval (ms) (read-only)"); 193 194 #define IEEE80211_HWMP_DEFAULT_MAXHOPS 31 195 196 static ieee80211_recv_action_func hwmp_recv_action_meshpath; 197 198 static struct ieee80211_mesh_proto_path mesh_proto_hwmp = { 199 .mpp_descr = "HWMP", 200 .mpp_ie = IEEE80211_MESHCONF_PATH_HWMP, 201 .mpp_discover = hwmp_discover, 202 .mpp_peerdown = hwmp_peerdown, 203 .mpp_senderror = hwmp_senderror, 204 .mpp_vattach = hwmp_vattach, 205 .mpp_vdetach = hwmp_vdetach, 206 .mpp_newstate = hwmp_newstate, 207 .mpp_privlen = sizeof(struct ieee80211_hwmp_route), 208 }; 209 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact, 210 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 211 &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I", 212 "mesh route inactivity timeout (ms)"); 213 214 static void 215 ieee80211_hwmp_init(void) 216 { 217 /* Default values as per amendment */ 218 ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000); 219 ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000); 220 ieee80211_hwmp_rootint = msecs_to_ticks(2*1000); 221 ieee80211_hwmp_rannint = msecs_to_ticks(1*1000); 222 ieee80211_hwmp_rootconfint_internal = msecs_to_ticks(2*1000); 223 ieee80211_hwmp_maxpreq_retries = 3; 224 /* 225 * (TU): A measurement of time equal to 1024 μs, 226 * 500 TU is 512 ms. 227 */ 228 ieee80211_hwmp_net_diameter_traversaltime = msecs_to_ticks(512); 229 230 /* 231 * NB: I dont know how to make SYSCTL_PROC that calls ms to ticks 232 * and return a struct timeval... 233 */ 234 ieee80211_hwmp_rootconfint.tv_usec = 235 ieee80211_hwmp_rootconfint_internal * 1000; 236 237 /* 238 * Register action frame handler. 239 */ 240 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESH, 241 IEEE80211_ACTION_MESH_HWMP, hwmp_recv_action_meshpath); 242 243 /* NB: default is 5 secs per spec */ 244 mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000); 245 246 /* 247 * Register HWMP. 248 */ 249 ieee80211_mesh_register_proto_path(&mesh_proto_hwmp); 250 } 251 SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL); 252 253 static void 254 hwmp_vattach(struct ieee80211vap *vap) 255 { 256 struct ieee80211_hwmp_state *hs; 257 258 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 259 ("not a mesh vap, opmode %d", vap->iv_opmode)); 260 261 hs = IEEE80211_MALLOC(sizeof(struct ieee80211_hwmp_state), M_80211_VAP, 262 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 263 if (hs == NULL) { 264 net80211_vap_printf(vap, "%s: couldn't alloc HWMP state\n", 265 __func__); 266 return; 267 } 268 hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS; 269 callout_init(&hs->hs_roottimer, 1); 270 vap->iv_hwmp = hs; 271 } 272 273 static void 274 hwmp_vdetach(struct ieee80211vap *vap) 275 { 276 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 277 278 callout_drain(&hs->hs_roottimer); 279 IEEE80211_FREE(vap->iv_hwmp, M_80211_VAP); 280 vap->iv_hwmp = NULL; 281 } 282 283 static int 284 hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg) 285 { 286 enum ieee80211_state nstate = vap->iv_state; 287 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 288 289 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 290 __func__, ieee80211_state_name[ostate], 291 ieee80211_state_name[nstate], arg); 292 293 if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN) 294 callout_drain(&hs->hs_roottimer); 295 if (nstate == IEEE80211_S_RUN) 296 hwmp_rootmode_setup(vap); 297 return 0; 298 } 299 300 /* 301 * Verify the length of an HWMP PREQ and return the number 302 * of destinations >= 1, if verification fails -1 is returned. 303 */ 304 static int 305 verify_mesh_preq_len(struct ieee80211vap *vap, 306 const struct ieee80211_frame *wh, const uint8_t *iefrm) 307 { 308 int alloc_sz = -1; 309 int ndest = -1; 310 if (iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE) { 311 /* Originator External Address present */ 312 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ_AE; 313 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET_AE]; 314 } else { 315 /* w/o Originator External Address */ 316 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ; 317 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET]; 318 } 319 alloc_sz += ndest * IEEE80211_MESHPREQ_TRGT_SZ; 320 321 if(iefrm[1] != (alloc_sz)) { 322 IEEE80211_DISCARD(vap, 323 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 324 wh, NULL, "PREQ (AE=%s) with wrong len", 325 iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE ? "1" : "0"); 326 return (-1); 327 } 328 return ndest; 329 } 330 331 /* 332 * Verify the length of an HWMP PREP and returns 1 on success, 333 * otherwise -1. 334 */ 335 static int 336 verify_mesh_prep_len(struct ieee80211vap *vap, 337 const struct ieee80211_frame *wh, const uint8_t *iefrm) 338 { 339 int alloc_sz = -1; 340 if (iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE) { 341 if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ_AE) 342 alloc_sz = IEEE80211_MESHPREP_BASE_SZ_AE; 343 } else if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ) 344 alloc_sz = IEEE80211_MESHPREP_BASE_SZ; 345 if(alloc_sz < 0) { 346 IEEE80211_DISCARD(vap, 347 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 348 wh, NULL, "PREP (AE=%s) with wrong len", 349 iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE ? "1" : "0"); 350 return (-1); 351 } 352 return (1); 353 } 354 355 /* 356 * Verify the length of an HWMP PERR and return the number 357 * of destinations >= 1, if verification fails -1 is returned. 358 */ 359 static int 360 verify_mesh_perr_len(struct ieee80211vap *vap, 361 const struct ieee80211_frame *wh, const uint8_t *iefrm) 362 { 363 int alloc_sz = -1; 364 const uint8_t *iefrm_t = iefrm; 365 uint8_t ndest = iefrm_t[IEEE80211_MESHPERR_NDEST_OFFSET]; 366 int i; 367 368 if(ndest > IEEE80211_MESHPERR_MAXDEST) { 369 IEEE80211_DISCARD(vap, 370 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 371 wh, NULL, "PERR with wrong number of destionat (>19), %u", 372 ndest); 373 return (-1); 374 } 375 376 iefrm_t += IEEE80211_MESHPERR_NDEST_OFFSET + 1; /* flag is next field */ 377 /* We need to check each destination flag to know size */ 378 for(i = 0; i<ndest; i++) { 379 if ((*iefrm_t) & IEEE80211_MESHPERR_FLAGS_AE) 380 iefrm_t += IEEE80211_MESHPERR_DEST_SZ_AE; 381 else 382 iefrm_t += IEEE80211_MESHPERR_DEST_SZ; 383 } 384 385 alloc_sz = (iefrm_t - iefrm) - 2; /* action + code */ 386 if(alloc_sz != iefrm[1]) { 387 IEEE80211_DISCARD(vap, 388 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 389 wh, NULL, "%s", "PERR with wrong len"); 390 return (-1); 391 } 392 return ndest; 393 } 394 395 static int 396 hwmp_recv_action_meshpath(struct ieee80211_node *ni, 397 const struct ieee80211_frame *wh, 398 const uint8_t *frm, const uint8_t *efrm) 399 { 400 struct ieee80211vap *vap = ni->ni_vap; 401 struct ieee80211_meshpreq_ie *preq; 402 struct ieee80211_meshprep_ie *prep; 403 struct ieee80211_meshperr_ie *perr; 404 struct ieee80211_meshrann_ie rann; 405 const uint8_t *iefrm = frm + 2; /* action + code */ 406 const uint8_t *iefrm_t = iefrm; /* temporary pointer */ 407 int ndest = -1; 408 int found = 0; 409 410 while (efrm - iefrm > 1) { 411 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0); 412 switch (*iefrm) { 413 case IEEE80211_ELEMID_MESHPREQ: 414 { 415 int i = 0; 416 417 iefrm_t = iefrm; 418 ndest = verify_mesh_preq_len(vap, wh, iefrm_t); 419 if (ndest < 0) { 420 vap->iv_stats.is_rx_mgtdiscard++; 421 break; 422 } 423 preq = IEEE80211_MALLOC(sizeof(*preq) + 424 (ndest - 1) * sizeof(*preq->preq_targets), 425 M_80211_MESH_PREQ, 426 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 427 KASSERT(preq != NULL, ("preq == NULL")); 428 429 preq->preq_ie = *iefrm_t++; 430 preq->preq_len = *iefrm_t++; 431 preq->preq_flags = *iefrm_t++; 432 preq->preq_hopcount = *iefrm_t++; 433 preq->preq_ttl = *iefrm_t++; 434 preq->preq_id = le32dec(iefrm_t); iefrm_t += 4; 435 IEEE80211_ADDR_COPY(preq->preq_origaddr, iefrm_t); 436 iefrm_t += 6; 437 preq->preq_origseq = le32dec(iefrm_t); iefrm_t += 4; 438 /* NB: may have Originator Proxied Address */ 439 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 440 IEEE80211_ADDR_COPY( 441 preq->preq_orig_ext_addr, iefrm_t); 442 iefrm_t += 6; 443 } 444 preq->preq_lifetime = le32dec(iefrm_t); iefrm_t += 4; 445 preq->preq_metric = le32dec(iefrm_t); iefrm_t += 4; 446 preq->preq_tcount = *iefrm_t++; 447 448 for (i = 0; i < preq->preq_tcount; i++) { 449 preq->preq_targets[i].target_flags = *iefrm_t++; 450 IEEE80211_ADDR_COPY( 451 preq->preq_targets[i].target_addr, iefrm_t); 452 iefrm_t += 6; 453 preq->preq_targets[i].target_seq = 454 le32dec(iefrm_t); 455 iefrm_t += 4; 456 } 457 458 hwmp_recv_preq(vap, ni, wh, preq); 459 IEEE80211_FREE(preq, M_80211_MESH_PREQ); 460 found++; 461 break; 462 } 463 case IEEE80211_ELEMID_MESHPREP: 464 { 465 iefrm_t = iefrm; 466 ndest = verify_mesh_prep_len(vap, wh, iefrm_t); 467 if (ndest < 0) { 468 vap->iv_stats.is_rx_mgtdiscard++; 469 break; 470 } 471 prep = IEEE80211_MALLOC(sizeof(*prep), 472 M_80211_MESH_PREP, 473 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 474 KASSERT(prep != NULL, ("prep == NULL")); 475 476 prep->prep_ie = *iefrm_t++; 477 prep->prep_len = *iefrm_t++; 478 prep->prep_flags = *iefrm_t++; 479 prep->prep_hopcount = *iefrm_t++; 480 prep->prep_ttl = *iefrm_t++; 481 IEEE80211_ADDR_COPY(prep->prep_targetaddr, iefrm_t); 482 iefrm_t += 6; 483 prep->prep_targetseq = le32dec(iefrm_t); iefrm_t += 4; 484 /* NB: May have Target Proxied Address */ 485 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 486 IEEE80211_ADDR_COPY( 487 prep->prep_target_ext_addr, iefrm_t); 488 iefrm_t += 6; 489 } 490 prep->prep_lifetime = le32dec(iefrm_t); iefrm_t += 4; 491 prep->prep_metric = le32dec(iefrm_t); iefrm_t += 4; 492 IEEE80211_ADDR_COPY(prep->prep_origaddr, iefrm_t); 493 iefrm_t += 6; 494 prep->prep_origseq = le32dec(iefrm_t); iefrm_t += 4; 495 496 hwmp_recv_prep(vap, ni, wh, prep); 497 IEEE80211_FREE(prep, M_80211_MESH_PREP); 498 found++; 499 break; 500 } 501 case IEEE80211_ELEMID_MESHPERR: 502 { 503 int i = 0; 504 505 iefrm_t = iefrm; 506 ndest = verify_mesh_perr_len(vap, wh, iefrm_t); 507 if (ndest < 0) { 508 vap->iv_stats.is_rx_mgtdiscard++; 509 break; 510 } 511 perr = IEEE80211_MALLOC(sizeof(*perr) + 512 (ndest - 1) * sizeof(*perr->perr_dests), 513 M_80211_MESH_PERR, 514 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 515 KASSERT(perr != NULL, ("perr == NULL")); 516 517 perr->perr_ie = *iefrm_t++; 518 perr->perr_len = *iefrm_t++; 519 perr->perr_ttl = *iefrm_t++; 520 perr->perr_ndests = *iefrm_t++; 521 522 for (i = 0; i<perr->perr_ndests; i++) { 523 perr->perr_dests[i].dest_flags = *iefrm_t++; 524 IEEE80211_ADDR_COPY( 525 perr->perr_dests[i].dest_addr, iefrm_t); 526 iefrm_t += 6; 527 perr->perr_dests[i].dest_seq = le32dec(iefrm_t); 528 iefrm_t += 4; 529 /* NB: May have Target Proxied Address */ 530 if (perr->perr_dests[i].dest_flags & 531 IEEE80211_MESHPERR_FLAGS_AE) { 532 IEEE80211_ADDR_COPY( 533 perr->perr_dests[i].dest_ext_addr, 534 iefrm_t); 535 iefrm_t += 6; 536 } 537 perr->perr_dests[i].dest_rcode = 538 le16dec(iefrm_t); 539 iefrm_t += 2; 540 } 541 542 hwmp_recv_perr(vap, ni, wh, perr); 543 IEEE80211_FREE(perr, M_80211_MESH_PERR); 544 found++; 545 break; 546 } 547 case IEEE80211_ELEMID_MESHRANN: 548 { 549 const struct ieee80211_meshrann_ie *mrann = 550 (const struct ieee80211_meshrann_ie *) iefrm; 551 if (mrann->rann_len != 552 sizeof(struct ieee80211_meshrann_ie) - 2) { 553 IEEE80211_DISCARD(vap, 554 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 555 wh, NULL, "%s", "RAN with wrong len"); 556 vap->iv_stats.is_rx_mgtdiscard++; 557 return 1; 558 } 559 memcpy(&rann, mrann, sizeof(rann)); 560 rann.rann_seq = le32dec(&mrann->rann_seq); 561 rann.rann_interval = le32dec(&mrann->rann_interval); 562 rann.rann_metric = le32dec(&mrann->rann_metric); 563 hwmp_recv_rann(vap, ni, wh, &rann); 564 found++; 565 break; 566 } 567 } 568 iefrm += iefrm[1] + 2; 569 } 570 if (!found) { 571 IEEE80211_DISCARD(vap, 572 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 573 wh, NULL, "%s", "PATH SEL action without IE"); 574 vap->iv_stats.is_rx_mgtdiscard++; 575 } 576 return 0; 577 } 578 579 static int 580 hwmp_send_action(struct ieee80211vap *vap, 581 const uint8_t da[IEEE80211_ADDR_LEN], 582 uint8_t *ie, size_t len) 583 { 584 struct ieee80211_node *ni; 585 struct ieee80211com *ic; 586 struct ieee80211_bpf_params params; 587 struct mbuf *m; 588 uint8_t *frm; 589 int ret; 590 591 if (IEEE80211_IS_MULTICAST(da)) { 592 ni = ieee80211_ref_node(vap->iv_bss); 593 #ifdef IEEE80211_DEBUG_REFCNT 594 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 595 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 596 __func__, __LINE__, 597 ni, ether_sprintf(ni->ni_macaddr), 598 ieee80211_node_refcnt(ni)+1); 599 #endif 600 ieee80211_ref_node(ni); 601 } 602 else 603 ni = ieee80211_mesh_find_txnode(vap, da); 604 605 if (vap->iv_state == IEEE80211_S_CAC) { 606 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 607 "block %s frame in CAC state", "HWMP action"); 608 vap->iv_stats.is_tx_badstate++; 609 return EIO; /* XXX */ 610 } 611 612 KASSERT(ni != NULL, ("null node")); 613 ic = ni->ni_ic; 614 615 m = ieee80211_getmgtframe(&frm, 616 ic->ic_headroom + sizeof(struct ieee80211_frame), 617 sizeof(struct ieee80211_action) + len 618 ); 619 if (m == NULL) { 620 ieee80211_free_node(ni); 621 vap->iv_stats.is_tx_nobuf++; 622 return ENOMEM; 623 } 624 *frm++ = IEEE80211_ACTION_CAT_MESH; 625 *frm++ = IEEE80211_ACTION_MESH_HWMP; 626 switch (*ie) { 627 case IEEE80211_ELEMID_MESHPREQ: 628 frm = hwmp_add_meshpreq(frm, 629 (struct ieee80211_meshpreq_ie *)ie); 630 break; 631 case IEEE80211_ELEMID_MESHPREP: 632 frm = hwmp_add_meshprep(frm, 633 (struct ieee80211_meshprep_ie *)ie); 634 break; 635 case IEEE80211_ELEMID_MESHPERR: 636 frm = hwmp_add_meshperr(frm, 637 (struct ieee80211_meshperr_ie *)ie); 638 break; 639 case IEEE80211_ELEMID_MESHRANN: 640 frm = hwmp_add_meshrann(frm, 641 (struct ieee80211_meshrann_ie *)ie); 642 break; 643 } 644 645 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 646 M_PREPEND(m, sizeof(struct ieee80211_frame), IEEE80211_M_NOWAIT); 647 if (m == NULL) { 648 ieee80211_free_node(ni); 649 vap->iv_stats.is_tx_nobuf++; 650 return ENOMEM; 651 } 652 653 IEEE80211_TX_LOCK(ic); 654 655 ieee80211_send_setup(ni, m, 656 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION, 657 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, vap->iv_myaddr); 658 659 m->m_flags |= M_ENCAP; /* mark encapsulated */ 660 IEEE80211_NODE_STAT(ni, tx_mgmt); 661 662 memset(¶ms, 0, sizeof(params)); 663 params.ibp_pri = WME_AC_VO; 664 params.ibp_rate0 = ni->ni_txparms->mgmtrate; 665 if (IEEE80211_IS_MULTICAST(da)) 666 params.ibp_try0 = 1; 667 else 668 params.ibp_try0 = ni->ni_txparms->maxretry; 669 params.ibp_power = ni->ni_txpower; 670 ret = ieee80211_raw_output(vap, ni, m, ¶ms); 671 IEEE80211_TX_UNLOCK(ic); 672 return (ret); 673 } 674 675 #define ADDSHORT(frm, v) do { \ 676 le16enc(frm, v); \ 677 frm += 2; \ 678 } while (0) 679 #define ADDWORD(frm, v) do { \ 680 le32enc(frm, v); \ 681 frm += 4; \ 682 } while (0) 683 /* 684 * Add a Mesh Path Request IE to a frame. 685 */ 686 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags 687 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr 688 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq 689 static uint8_t * 690 hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq) 691 { 692 int i; 693 694 *frm++ = IEEE80211_ELEMID_MESHPREQ; 695 *frm++ = preq->preq_len; /* len already calculated */ 696 *frm++ = preq->preq_flags; 697 *frm++ = preq->preq_hopcount; 698 *frm++ = preq->preq_ttl; 699 ADDWORD(frm, preq->preq_id); 700 IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6; 701 ADDWORD(frm, preq->preq_origseq); 702 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 703 IEEE80211_ADDR_COPY(frm, preq->preq_orig_ext_addr); 704 frm += 6; 705 } 706 ADDWORD(frm, preq->preq_lifetime); 707 ADDWORD(frm, preq->preq_metric); 708 *frm++ = preq->preq_tcount; 709 for (i = 0; i < preq->preq_tcount; i++) { 710 *frm++ = PREQ_TFLAGS(i); 711 IEEE80211_ADDR_COPY(frm, PREQ_TADDR(i)); 712 frm += 6; 713 ADDWORD(frm, PREQ_TSEQ(i)); 714 } 715 return frm; 716 } 717 #undef PREQ_TFLAGS 718 #undef PREQ_TADDR 719 #undef PREQ_TSEQ 720 721 /* 722 * Add a Mesh Path Reply IE to a frame. 723 */ 724 static uint8_t * 725 hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep) 726 { 727 *frm++ = IEEE80211_ELEMID_MESHPREP; 728 *frm++ = prep->prep_len; /* len already calculated */ 729 *frm++ = prep->prep_flags; 730 *frm++ = prep->prep_hopcount; 731 *frm++ = prep->prep_ttl; 732 IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6; 733 ADDWORD(frm, prep->prep_targetseq); 734 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 735 IEEE80211_ADDR_COPY(frm, prep->prep_target_ext_addr); 736 frm += 6; 737 } 738 ADDWORD(frm, prep->prep_lifetime); 739 ADDWORD(frm, prep->prep_metric); 740 IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6; 741 ADDWORD(frm, prep->prep_origseq); 742 return frm; 743 } 744 745 /* 746 * Add a Mesh Path Error IE to a frame. 747 */ 748 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags 749 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr 750 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 751 #define PERR_EXTADDR(n) perr->perr_dests[n].dest_ext_addr 752 #define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode 753 static uint8_t * 754 hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr) 755 { 756 int i; 757 758 *frm++ = IEEE80211_ELEMID_MESHPERR; 759 *frm++ = perr->perr_len; /* len already calculated */ 760 *frm++ = perr->perr_ttl; 761 *frm++ = perr->perr_ndests; 762 for (i = 0; i < perr->perr_ndests; i++) { 763 *frm++ = PERR_DFLAGS(i); 764 IEEE80211_ADDR_COPY(frm, PERR_DADDR(i)); 765 frm += 6; 766 ADDWORD(frm, PERR_DSEQ(i)); 767 if (PERR_DFLAGS(i) & IEEE80211_MESHPERR_FLAGS_AE) { 768 IEEE80211_ADDR_COPY(frm, PERR_EXTADDR(i)); 769 frm += 6; 770 } 771 ADDSHORT(frm, PERR_DRCODE(i)); 772 } 773 return frm; 774 } 775 #undef PERR_DFLAGS 776 #undef PERR_DADDR 777 #undef PERR_DSEQ 778 #undef PERR_EXTADDR 779 #undef PERR_DRCODE 780 781 /* 782 * Add a Root Annoucement IE to a frame. 783 */ 784 static uint8_t * 785 hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann) 786 { 787 *frm++ = IEEE80211_ELEMID_MESHRANN; 788 *frm++ = rann->rann_len; 789 *frm++ = rann->rann_flags; 790 *frm++ = rann->rann_hopcount; 791 *frm++ = rann->rann_ttl; 792 IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6; 793 ADDWORD(frm, rann->rann_seq); 794 ADDWORD(frm, rann->rann_interval); 795 ADDWORD(frm, rann->rann_metric); 796 return frm; 797 } 798 799 static void 800 hwmp_rootmode_setup(struct ieee80211vap *vap) 801 { 802 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 803 struct ieee80211_mesh_state *ms = vap->iv_mesh; 804 805 switch (hs->hs_rootmode) { 806 case IEEE80211_HWMP_ROOTMODE_DISABLED: 807 callout_drain(&hs->hs_roottimer); 808 ms->ms_flags &= ~IEEE80211_MESHFLAGS_ROOT; 809 break; 810 case IEEE80211_HWMP_ROOTMODE_NORMAL: 811 case IEEE80211_HWMP_ROOTMODE_PROACTIVE: 812 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint, 813 hwmp_rootmode_cb, vap); 814 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT; 815 break; 816 case IEEE80211_HWMP_ROOTMODE_RANN: 817 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint, 818 hwmp_rootmode_rann_cb, vap); 819 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT; 820 break; 821 } 822 } 823 824 /* 825 * Send a broadcast Path Request to find all nodes on the mesh. We are 826 * called when the vap is configured as a HWMP root node. 827 */ 828 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 829 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr 830 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 831 static void 832 hwmp_rootmode_cb(void *arg) 833 { 834 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 835 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 836 struct ieee80211_mesh_state *ms = vap->iv_mesh; 837 struct ieee80211_meshpreq_ie preq; 838 839 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 840 "%s", "send broadcast PREQ"); 841 842 preq.preq_flags = 0; 843 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE) 844 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_GATE; 845 if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE) 846 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP; 847 preq.preq_hopcount = 0; 848 preq.preq_ttl = ms->ms_ttl; 849 preq.preq_id = ++hs->hs_preqid; 850 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 851 preq.preq_origseq = ++hs->hs_seq; 852 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout); 853 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 854 preq.preq_tcount = 1; 855 IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr); 856 PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO | 857 IEEE80211_MESHPREQ_TFLAGS_USN; 858 PREQ_TSEQ(0) = 0; 859 vap->iv_stats.is_hwmp_rootreqs++; 860 /* NB: we enforce rate check ourself */ 861 hwmp_send_preq(vap, broadcastaddr, &preq, NULL, NULL); 862 hwmp_rootmode_setup(vap); 863 } 864 #undef PREQ_TFLAGS 865 #undef PREQ_TADDR 866 #undef PREQ_TSEQ 867 868 /* 869 * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are 870 * called when the vap is configured as a HWMP RANN root node. 871 */ 872 static void 873 hwmp_rootmode_rann_cb(void *arg) 874 { 875 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 876 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 877 struct ieee80211_mesh_state *ms = vap->iv_mesh; 878 struct ieee80211_meshrann_ie rann; 879 880 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 881 "%s", "send broadcast RANN"); 882 883 rann.rann_flags = 0; 884 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE) 885 rann.rann_flags |= IEEE80211_MESHFLAGS_GATE; 886 rann.rann_hopcount = 0; 887 rann.rann_ttl = ms->ms_ttl; 888 IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr); 889 rann.rann_seq = ++hs->hs_seq; 890 rann.rann_interval = ieee80211_hwmp_rannint; 891 rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 892 893 vap->iv_stats.is_hwmp_rootrann++; 894 hwmp_send_rann(vap, broadcastaddr, &rann); 895 hwmp_rootmode_setup(vap); 896 } 897 898 /* 899 * Update forwarding information to TA if metric improves. 900 */ 901 static void 902 hwmp_update_transmitter(struct ieee80211vap *vap, struct ieee80211_node *ni, 903 const char *hwmp_frame) 904 { 905 struct ieee80211_mesh_state *ms = vap->iv_mesh; 906 struct ieee80211_mesh_route *rttran = NULL; /* Transmitter */ 907 int metric = 0; 908 909 rttran = ieee80211_mesh_rt_find(vap, ni->ni_macaddr); 910 if (rttran == NULL) { 911 rttran = ieee80211_mesh_rt_add(vap, ni->ni_macaddr); 912 if (rttran == NULL) { 913 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 914 "unable to add path to transmitter %6D of %s", 915 ni->ni_macaddr, ":", hwmp_frame); 916 vap->iv_stats.is_mesh_rtaddfailed++; 917 return; 918 } 919 } 920 metric = ms->ms_pmetric->mpm_metric(ni); 921 if (!(rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) || 922 rttran->rt_metric > metric) 923 { 924 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 925 "%s path to transmitter %6D of %s, metric %d:%d", 926 rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 927 "prefer" : "update", ni->ni_macaddr, ":", hwmp_frame, 928 rttran->rt_metric, metric); 929 IEEE80211_ADDR_COPY(rttran->rt_nexthop, ni->ni_macaddr); 930 rttran->rt_metric = metric; 931 rttran->rt_nhops = 1; 932 ieee80211_mesh_rt_update(rttran, ms->ms_ppath->mpp_inact); 933 rttran->rt_flags = IEEE80211_MESHRT_FLAGS_VALID; 934 } 935 } 936 937 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags 938 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr 939 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq 940 static void 941 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni, 942 const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq) 943 { 944 struct ieee80211_mesh_state *ms = vap->iv_mesh; 945 struct ieee80211_mesh_route *rtorig = NULL; 946 struct ieee80211_mesh_route *rtorig_ext = NULL; 947 struct ieee80211_mesh_route *rttarg = NULL; 948 struct ieee80211_hwmp_route *hrorig = NULL; 949 struct ieee80211_hwmp_route *hrtarg = NULL; 950 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 951 ieee80211_hwmp_seq preqid; /* last seen preqid for orig */ 952 uint32_t metric = 0; 953 954 /* 955 * Ignore PREQs from us. Could happen because someone forward it 956 * back to us. 957 */ 958 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr)) 959 return; 960 961 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 962 "received PREQ, orig %6D, targ(0) %6D", preq->preq_origaddr, ":", 963 PREQ_TADDR(0), ":"); 964 965 /* 966 * Acceptance criteria: (if the PREQ is not for us or not broadcast, 967 * or an external mac address not proxied by us), 968 * AND forwarding is disabled, discard this PREQ. 969 */ 970 rttarg = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0)); 971 if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD) && 972 (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) || 973 !IEEE80211_IS_MULTICAST(PREQ_TADDR(0)) || 974 (rttarg != NULL && 975 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY && 976 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate)))) { 977 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 978 preq->preq_origaddr, NULL, "%s", "not accepting PREQ"); 979 return; 980 } 981 /* 982 * Acceptance criteria: if unicast addressed 983 * AND no valid forwarding for Target of PREQ, discard this PREQ. 984 */ 985 if(rttarg != NULL) 986 hrtarg = IEEE80211_MESH_ROUTE_PRIV(rttarg, 987 struct ieee80211_hwmp_route); 988 /* Address mode: ucast */ 989 if(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AM && 990 rttarg == NULL && 991 !IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) { 992 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 993 preq->preq_origaddr, NULL, 994 "unicast addressed PREQ of unknown target %6D", 995 PREQ_TADDR(0), ":"); 996 return; 997 } 998 999 /* PREQ ACCEPTED */ 1000 1001 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr); 1002 if (rtorig == NULL) { 1003 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr); 1004 if (rtorig == NULL) { 1005 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1006 "unable to add orig path to %6D", 1007 preq->preq_origaddr, ":"); 1008 vap->iv_stats.is_mesh_rtaddfailed++; 1009 return; 1010 } 1011 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1012 "adding originator %6D", preq->preq_origaddr, ":"); 1013 } 1014 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route); 1015 1016 /* record last seen preqid */ 1017 preqid = hrorig->hr_preqid; 1018 hrorig->hr_preqid = HWMP_SEQ_MAX(hrorig->hr_preqid, preq->preq_id); 1019 1020 /* Data creation and update of forwarding information 1021 * according to Table 11C-8 for originator mesh STA. 1022 */ 1023 metric = preq->preq_metric + ms->ms_pmetric->mpm_metric(ni); 1024 if (HWMP_SEQ_GT(preq->preq_origseq, hrorig->hr_seq) || 1025 (HWMP_SEQ_EQ(preq->preq_origseq, hrorig->hr_seq) && 1026 metric < rtorig->rt_metric)) { 1027 hrorig->hr_seq = preq->preq_origseq; 1028 IEEE80211_ADDR_COPY(rtorig->rt_nexthop, wh->i_addr2); 1029 rtorig->rt_metric = metric; 1030 rtorig->rt_nhops = preq->preq_hopcount + 1; 1031 ieee80211_mesh_rt_update(rtorig, preq->preq_lifetime); 1032 /* Path to orig is valid now. 1033 * NB: we know it can't be Proxy, and if it is GATE 1034 * it will be marked below. 1035 */ 1036 rtorig->rt_flags = IEEE80211_MESHRT_FLAGS_VALID; 1037 } else if ((hrtarg != NULL && 1038 !HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0))) || 1039 (rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1040 preqid >= preq->preq_id)) { 1041 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1042 "discard PREQ from %6D, old seqno %u <= %u," 1043 " or old preqid %u < %u", 1044 preq->preq_origaddr, ":", 1045 preq->preq_origseq, hrorig->hr_seq, 1046 preq->preq_id, preqid); 1047 return; 1048 } 1049 1050 /* Update forwarding information to TA if metric improves. */ 1051 hwmp_update_transmitter(vap, ni, "PREQ"); 1052 1053 /* 1054 * Check if the PREQ is addressed to us. 1055 * or a Proxy currently gated by us. 1056 */ 1057 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) || 1058 (ms->ms_flags & IEEE80211_MESHFLAGS_GATE && 1059 rttarg != NULL && 1060 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate) && 1061 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY && 1062 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 1063 struct ieee80211_meshprep_ie prep; 1064 1065 /* 1066 * When we are the target we shall update our own HWMP seq 1067 * number with max of (current and preq->seq) + 1 1068 */ 1069 hs->hs_seq = HWMP_SEQ_MAX(hs->hs_seq, PREQ_TSEQ(0)) + 1; 1070 1071 prep.prep_flags = 0; 1072 prep.prep_hopcount = 0; 1073 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1074 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr); 1075 if (rttarg != NULL && /* if NULL it means we are the target */ 1076 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1077 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1078 "reply for proxy %6D", rttarg->rt_dest, ":"); 1079 prep.prep_flags |= IEEE80211_MESHPREP_FLAGS_AE; 1080 IEEE80211_ADDR_COPY(prep.prep_target_ext_addr, 1081 rttarg->rt_dest); 1082 /* update proxy seqno to HWMP seqno */ 1083 rttarg->rt_ext_seq = hs->hs_seq; 1084 prep.prep_hopcount = rttarg->rt_nhops; 1085 prep.prep_metric = rttarg->rt_metric; 1086 IEEE80211_ADDR_COPY(prep.prep_targetaddr, rttarg->rt_mesh_gate); 1087 } 1088 /* 1089 * Build and send a PREP frame. 1090 */ 1091 prep.prep_ttl = ms->ms_ttl; 1092 prep.prep_targetseq = hs->hs_seq; 1093 prep.prep_lifetime = preq->preq_lifetime; 1094 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr); 1095 prep.prep_origseq = preq->preq_origseq; 1096 1097 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1098 "reply to %6D", preq->preq_origaddr, ":"); 1099 hwmp_send_prep(vap, wh->i_addr2, &prep); 1100 return; 1101 } 1102 /* we may update our proxy information for the orig external */ 1103 else if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 1104 rtorig_ext = 1105 ieee80211_mesh_rt_find(vap, preq->preq_orig_ext_addr); 1106 if (rtorig_ext == NULL) { 1107 rtorig_ext = ieee80211_mesh_rt_add(vap, 1108 preq->preq_orig_ext_addr); 1109 if (rtorig_ext == NULL) { 1110 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1111 "unable to add orig ext proxy to %6D", 1112 preq->preq_orig_ext_addr, ":"); 1113 vap->iv_stats.is_mesh_rtaddfailed++; 1114 return; 1115 } 1116 IEEE80211_ADDR_COPY(rtorig_ext->rt_mesh_gate, 1117 preq->preq_origaddr); 1118 } 1119 rtorig_ext->rt_ext_seq = preq->preq_origseq; 1120 ieee80211_mesh_rt_update(rtorig_ext, preq->preq_lifetime); 1121 } 1122 /* 1123 * Proactive PREQ: reply with a proactive PREP to the 1124 * root STA if requested. 1125 */ 1126 if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) && 1127 (PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) { 1128 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1129 "root mesh station @ %6D", preq->preq_origaddr, ":"); 1130 1131 /* Check if root is a mesh gate, mark it */ 1132 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_GATE) { 1133 struct ieee80211_mesh_gate_route *gr; 1134 1135 rtorig->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE; 1136 gr = ieee80211_mesh_mark_gate(vap, preq->preq_origaddr, 1137 rtorig); 1138 gr->gr_lastseq = 0; /* NOT GANN */ 1139 } 1140 1141 /* 1142 * Reply with a PREP if we don't have a path to the root 1143 * or if the root sent us a proactive PREQ. 1144 */ 1145 if ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 || 1146 (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) { 1147 struct ieee80211_meshprep_ie prep; 1148 1149 prep.prep_flags = 0; 1150 prep.prep_hopcount = 0; 1151 prep.prep_ttl = ms->ms_ttl; 1152 IEEE80211_ADDR_COPY(prep.prep_origaddr, 1153 preq->preq_origaddr); 1154 prep.prep_origseq = preq->preq_origseq; 1155 prep.prep_lifetime = preq->preq_lifetime; 1156 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1157 IEEE80211_ADDR_COPY(prep.prep_targetaddr, 1158 vap->iv_myaddr); 1159 prep.prep_targetseq = ++hs->hs_seq; 1160 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep); 1161 } 1162 } 1163 1164 /* 1165 * Forwarding and Intermediate reply for PREQs with 1 target. 1166 */ 1167 if ((preq->preq_tcount == 1) && (preq->preq_ttl > 1) && 1168 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) { 1169 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */ 1170 1171 memcpy(&ppreq, preq, sizeof(ppreq)); 1172 1173 /* 1174 * We have a valid route to this node. 1175 * NB: if target is proxy dont reply. 1176 */ 1177 if (rttarg != NULL && 1178 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1179 !(rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)) { 1180 /* 1181 * Check if we can send an intermediate Path Reply, 1182 * i.e., Target Only bit is not set and target is not 1183 * the MAC broadcast address. 1184 */ 1185 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO) && 1186 !IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr)) { 1187 struct ieee80211_meshprep_ie prep; 1188 1189 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1190 "intermediate reply for PREQ from %6D", 1191 preq->preq_origaddr, ":"); 1192 prep.prep_flags = 0; 1193 prep.prep_hopcount = rttarg->rt_nhops; 1194 prep.prep_ttl = ms->ms_ttl; 1195 IEEE80211_ADDR_COPY(&prep.prep_targetaddr, 1196 PREQ_TADDR(0)); 1197 prep.prep_targetseq = hrtarg->hr_seq; 1198 prep.prep_lifetime = preq->preq_lifetime; 1199 prep.prep_metric =rttarg->rt_metric; 1200 IEEE80211_ADDR_COPY(&prep.prep_origaddr, 1201 preq->preq_origaddr); 1202 prep.prep_origseq = hrorig->hr_seq; 1203 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep); 1204 1205 /* 1206 * Set TO and unset RF bits because we have 1207 * sent a PREP. 1208 */ 1209 ppreq.preq_targets[0].target_flags |= 1210 IEEE80211_MESHPREQ_TFLAGS_TO; 1211 } 1212 } 1213 1214 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1215 "forward PREQ from %6D", 1216 preq->preq_origaddr, ":"); 1217 ppreq.preq_hopcount += 1; 1218 ppreq.preq_ttl -= 1; 1219 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni); 1220 1221 /* don't do PREQ ratecheck when we propagate */ 1222 hwmp_send_preq(vap, broadcastaddr, &ppreq, NULL, NULL); 1223 } 1224 } 1225 #undef PREQ_TFLAGS 1226 #undef PREQ_TADDR 1227 #undef PREQ_TSEQ 1228 1229 static int 1230 hwmp_send_preq(struct ieee80211vap *vap, 1231 const uint8_t da[IEEE80211_ADDR_LEN], 1232 struct ieee80211_meshpreq_ie *preq, 1233 struct timeval *last, struct timeval *minint) 1234 { 1235 1236 /* 1237 * Enforce PREQ interval. 1238 * NB: Proactive ROOT PREQs rate is handled by cb task. 1239 */ 1240 if (last != NULL && minint != NULL) { 1241 if (ratecheck(last, minint) == 0) 1242 return EALREADY; /* XXX: we should postpone */ 1243 getmicrouptime(last); 1244 } 1245 1246 /* 1247 * mesh preq action frame format 1248 * [6] da 1249 * [6] sa 1250 * [6] addr3 = sa 1251 * [1] action 1252 * [1] category 1253 * [tlv] mesh path request 1254 */ 1255 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ; 1256 preq->preq_len = (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE ? 1257 IEEE80211_MESHPREQ_BASE_SZ_AE : IEEE80211_MESHPREQ_BASE_SZ) + 1258 preq->preq_tcount * IEEE80211_MESHPREQ_TRGT_SZ; 1259 return hwmp_send_action(vap, da, (uint8_t *)preq, preq->preq_len+2); 1260 } 1261 1262 static void 1263 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni, 1264 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep) 1265 { 1266 #define IS_PROXY(rt) (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) 1267 #define PROXIED_BY_US(rt) \ 1268 (IEEE80211_ADDR_EQ(vap->iv_myaddr, rt->rt_mesh_gate)) 1269 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1270 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1271 struct ieee80211_mesh_route *rt = NULL; 1272 struct ieee80211_mesh_route *rtorig = NULL; 1273 struct ieee80211_mesh_route *rtext = NULL; 1274 struct ieee80211_hwmp_route *hr; 1275 struct ieee80211com *ic = vap->iv_ic; 1276 struct mbuf *m, *next; 1277 uint32_t metric = 0; 1278 const uint8_t *addr; 1279 1280 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1281 "received PREP, orig %6D, targ %6D", prep->prep_origaddr, ":", 1282 prep->prep_targetaddr, ":"); 1283 1284 /* 1285 * Acceptance criteria: (If the corresponding PREP was not generated 1286 * by us OR not generated by an external mac that is not proxied by us) 1287 * AND forwarding is disabled, discard this PREP. 1288 */ 1289 rtorig = ieee80211_mesh_rt_find(vap, prep->prep_origaddr); 1290 if ((!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) || 1291 (rtorig != NULL && IS_PROXY(rtorig) && !PROXIED_BY_US(rtorig))) && 1292 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)){ 1293 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1294 "discard PREP, orig(%6D) not proxied or generated by us", 1295 prep->prep_origaddr, ":"); 1296 return; 1297 } 1298 1299 /* PREP ACCEPTED */ 1300 1301 /* 1302 * If accepted shall create or update the active forwarding information 1303 * it maintains for the target mesh STA of the PREP (according to the 1304 * rules defined in 13.10.8.4). If the conditions for creating or 1305 * updating the forwarding information have not been met in those 1306 * rules, no further steps are applied to the PREP. 1307 */ 1308 rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr); 1309 if (rt == NULL) { 1310 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr); 1311 if (rt == NULL) { 1312 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1313 "unable to add PREP path to %6D", 1314 prep->prep_targetaddr, ":"); 1315 vap->iv_stats.is_mesh_rtaddfailed++; 1316 return; 1317 } 1318 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1319 "adding target %6D", prep->prep_targetaddr, ":"); 1320 } 1321 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1322 /* update path metric */ 1323 metric = prep->prep_metric + ms->ms_pmetric->mpm_metric(ni); 1324 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 1325 if (HWMP_SEQ_LT(prep->prep_targetseq, hr->hr_seq)) { 1326 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1327 "discard PREP from %6D, old seq no %u < %u", 1328 prep->prep_targetaddr, ":", 1329 prep->prep_targetseq, hr->hr_seq); 1330 return; 1331 } else if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq) && 1332 metric > rt->rt_metric) { 1333 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1334 "discard PREP from %6D, new metric %u > %u", 1335 prep->prep_targetaddr, ":", 1336 metric, rt->rt_metric); 1337 return; 1338 } 1339 } 1340 1341 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1342 "%s path to %6D, hopcount %d:%d metric %d:%d", 1343 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1344 "prefer" : "update", 1345 prep->prep_targetaddr, ":", 1346 rt->rt_nhops, prep->prep_hopcount + 1, 1347 rt->rt_metric, metric); 1348 1349 hr->hr_seq = prep->prep_targetseq; 1350 hr->hr_preqretries = 0; 1351 IEEE80211_ADDR_COPY(rt->rt_nexthop, ni->ni_macaddr); 1352 rt->rt_metric = metric; 1353 rt->rt_nhops = prep->prep_hopcount + 1; 1354 ieee80211_mesh_rt_update(rt, prep->prep_lifetime); 1355 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) { 1356 /* discovery complete */ 1357 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_DISCOVER; 1358 } 1359 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; /* mark valid */ 1360 1361 /* Update forwarding information to TA if metric improves */ 1362 hwmp_update_transmitter(vap, ni, "PREP"); 1363 1364 /* 1365 * If it's NOT for us, propagate the PREP 1366 */ 1367 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) && 1368 prep->prep_ttl > 1 && 1369 prep->prep_hopcount < hs->hs_maxhops) { 1370 struct ieee80211_meshprep_ie pprep; /* propagated PREP */ 1371 /* 1372 * NB: We should already have setup the path to orig 1373 * mesh STA when we propagated PREQ to target mesh STA, 1374 * no PREP is generated without a corresponding PREQ. 1375 * XXX: for now just ignore. 1376 */ 1377 if (rtorig == NULL) { 1378 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1379 "received PREP for an unknown orig(%6D)", 1380 prep->prep_origaddr, ":"); 1381 return; 1382 } 1383 1384 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1385 "propagate PREP from %6D", 1386 prep->prep_targetaddr, ":"); 1387 1388 memcpy(&pprep, prep, sizeof(pprep)); 1389 pprep.prep_hopcount += 1; 1390 pprep.prep_ttl -= 1; 1391 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni); 1392 hwmp_send_prep(vap, rtorig->rt_nexthop, &pprep); 1393 1394 /* precursor list for the Target Mesh STA Address is updated */ 1395 } 1396 1397 /* 1398 * Check if we received a PREP w/ AE and store target external address. 1399 * We may store target external address if received PREP w/ AE 1400 * and we are not final destination 1401 */ 1402 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 1403 rtext = ieee80211_mesh_rt_find(vap, 1404 prep->prep_target_ext_addr); 1405 if (rtext == NULL) { 1406 rtext = ieee80211_mesh_rt_add(vap, 1407 prep->prep_target_ext_addr); 1408 if (rtext == NULL) { 1409 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1410 "unable to add PREP path to proxy %6D", 1411 prep->prep_targetaddr, ":"); 1412 vap->iv_stats.is_mesh_rtaddfailed++; 1413 return; 1414 } 1415 } 1416 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1417 "%s path to %6D, hopcount %d:%d metric %d:%d", 1418 rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1419 "prefer" : "update", 1420 prep->prep_target_ext_addr, ":", 1421 rtext->rt_nhops, prep->prep_hopcount + 1, 1422 rtext->rt_metric, metric); 1423 1424 rtext->rt_flags = IEEE80211_MESHRT_FLAGS_PROXY | 1425 IEEE80211_MESHRT_FLAGS_VALID; 1426 IEEE80211_ADDR_COPY(rtext->rt_dest, 1427 prep->prep_target_ext_addr); 1428 IEEE80211_ADDR_COPY(rtext->rt_mesh_gate, 1429 prep->prep_targetaddr); 1430 IEEE80211_ADDR_COPY(rtext->rt_nexthop, wh->i_addr2); 1431 rtext->rt_metric = metric; 1432 rtext->rt_lifetime = prep->prep_lifetime; 1433 rtext->rt_nhops = prep->prep_hopcount + 1; 1434 rtext->rt_ext_seq = prep->prep_origseq; /* new proxy seq */ 1435 /* 1436 * XXX: proxy entries have no HWMP priv data, 1437 * nullify them to be sure? 1438 */ 1439 } 1440 /* 1441 * Check for frames queued awaiting path discovery. 1442 * XXX probably can tell exactly and avoid remove call 1443 * NB: hash may have false matches, if so they will get 1444 * stuck back on the stageq because there won't be 1445 * a path. 1446 */ 1447 addr = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ? 1448 prep->prep_target_ext_addr : prep->prep_targetaddr; 1449 m = ieee80211_ageq_remove(&ic->ic_stageq, 1450 (struct ieee80211_node *)(uintptr_t) 1451 ieee80211_mac_hash(ic, addr)); /* either dest or ext_dest */ 1452 1453 /* 1454 * All frames in the stageq here should be non-M_ENCAP; or things 1455 * will get very unhappy. 1456 */ 1457 for (; m != NULL; m = next) { 1458 next = m->m_nextpkt; 1459 m->m_nextpkt = NULL; 1460 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1461 "flush queued frame %p len %d", m, m->m_pkthdr.len); 1462 /* 1463 * If the mbuf has M_ENCAP set, ensure we free it. 1464 * Note that after if_transmit() is called, m is invalid. 1465 */ 1466 (void) ieee80211_vap_xmitpkt(vap, m); 1467 } 1468 #undef IS_PROXY 1469 #undef PROXIED_BY_US 1470 } 1471 1472 static int 1473 hwmp_send_prep(struct ieee80211vap *vap, 1474 const uint8_t da[IEEE80211_ADDR_LEN], 1475 struct ieee80211_meshprep_ie *prep) 1476 { 1477 /* NB: there's no PREP minimum interval. */ 1478 1479 /* 1480 * mesh prep action frame format 1481 * [6] da 1482 * [6] sa 1483 * [6] addr3 = sa 1484 * [1] action 1485 * [1] category 1486 * [tlv] mesh path reply 1487 */ 1488 prep->prep_ie = IEEE80211_ELEMID_MESHPREP; 1489 prep->prep_len = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ? 1490 IEEE80211_MESHPREP_BASE_SZ_AE : IEEE80211_MESHPREP_BASE_SZ; 1491 return hwmp_send_action(vap, da, (uint8_t *)prep, prep->prep_len + 2); 1492 } 1493 1494 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1495 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1496 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1497 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1498 static void 1499 hwmp_peerdown(struct ieee80211_node *ni) 1500 { 1501 struct ieee80211vap *vap = ni->ni_vap; 1502 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1503 struct ieee80211_meshperr_ie perr; 1504 struct ieee80211_mesh_route *rt; 1505 struct ieee80211_hwmp_route *hr; 1506 1507 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr); 1508 if (rt == NULL) 1509 return; 1510 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1511 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1512 "%s", "delete route entry"); 1513 perr.perr_ttl = ms->ms_ttl; 1514 perr.perr_ndests = 1; 1515 PERR_DFLAGS(0) = 0; 1516 if (hr->hr_seq == 0) 1517 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN; 1518 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC; 1519 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest); 1520 PERR_DSEQ(0) = ++hr->hr_seq; 1521 PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH; 1522 /* NB: flush everything passing through peer */ 1523 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr); 1524 hwmp_send_perr(vap, broadcastaddr, &perr); 1525 } 1526 #undef PERR_DFLAGS 1527 #undef PERR_DADDR 1528 #undef PERR_DSEQ 1529 #undef PERR_DRCODE 1530 1531 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags 1532 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr 1533 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 1534 #define PERR_DEXTADDR(n) perr->perr_dests[n].dest_ext_addr 1535 static void 1536 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni, 1537 const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr) 1538 { 1539 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1540 struct ieee80211_mesh_route *rt = NULL; 1541 struct ieee80211_mesh_route *rt_ext = NULL; 1542 struct ieee80211_hwmp_route *hr; 1543 struct ieee80211_meshperr_ie *pperr = NULL; 1544 int i, j = 0, forward = 0; 1545 1546 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1547 "received PERR from %6D", wh->i_addr2, ":"); 1548 1549 /* 1550 * if forwarding is true, prepare pperr 1551 */ 1552 if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) { 1553 forward = 1; 1554 pperr = IEEE80211_MALLOC(sizeof(*perr) + 31*sizeof(*perr->perr_dests), 1555 M_80211_MESH_PERR, IEEE80211_M_NOWAIT); /* XXX: magic number, 32 err dests */ 1556 } 1557 1558 /* 1559 * Acceptance criteria: check if we have forwarding information 1560 * stored about destination, and that nexthop == TA of this PERR. 1561 * NB: we also build a new PERR to propagate in case we should forward. 1562 */ 1563 for (i = 0; i < perr->perr_ndests; i++) { 1564 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i)); 1565 if (rt == NULL) 1566 continue; 1567 if (!IEEE80211_ADDR_EQ(rt->rt_nexthop, wh->i_addr2)) 1568 continue; 1569 1570 /* found and accepted a PERR ndest element, process it... */ 1571 if (forward) 1572 memcpy(&pperr->perr_dests[j], &perr->perr_dests[i], 1573 sizeof(*perr->perr_dests)); 1574 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1575 switch(PERR_DFLAGS(i)) { 1576 case (IEEE80211_REASON_MESH_PERR_NO_FI): 1577 if (PERR_DSEQ(i) == 0) { 1578 hr->hr_seq++; 1579 if (forward) { 1580 pperr->perr_dests[j].dest_seq = 1581 hr->hr_seq; 1582 } 1583 } else { 1584 hr->hr_seq = PERR_DSEQ(i); 1585 } 1586 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID; 1587 j++; 1588 break; 1589 case (IEEE80211_REASON_MESH_PERR_DEST_UNREACH): 1590 if(HWMP_SEQ_GT(PERR_DSEQ(i), hr->hr_seq)) { 1591 hr->hr_seq = PERR_DSEQ(i); 1592 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID; 1593 j++; 1594 } 1595 break; 1596 case (IEEE80211_REASON_MESH_PERR_NO_PROXY): 1597 rt_ext = ieee80211_mesh_rt_find(vap, PERR_DEXTADDR(i)); 1598 if (rt_ext != NULL) { 1599 rt_ext->rt_flags &= 1600 ~IEEE80211_MESHRT_FLAGS_VALID; 1601 j++; 1602 } 1603 break; 1604 default: 1605 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1606 "PERR, unknown reason code %u\n", PERR_DFLAGS(i)); 1607 goto done; /* XXX: stats?? */ 1608 } 1609 ieee80211_mesh_rt_flush_peer(vap, PERR_DADDR(i)); 1610 KASSERT(j < 32, ("PERR, error ndest >= 32 (%u)", j)); 1611 } 1612 if (j == 0) { 1613 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, "%s", 1614 "PERR not accepted"); 1615 goto done; /* XXX: stats?? */ 1616 } 1617 1618 /* 1619 * Propagate the PERR if we previously found it on our routing table. 1620 */ 1621 if (forward && perr->perr_ttl > 1) { 1622 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1623 "propagate PERR from %6D", wh->i_addr2, ":"); 1624 pperr->perr_ndests = j; 1625 pperr->perr_ttl--; 1626 hwmp_send_perr(vap, broadcastaddr, pperr); 1627 } 1628 done: 1629 if (pperr != NULL) 1630 IEEE80211_FREE(pperr, M_80211_MESH_PERR); 1631 } 1632 #undef PERR_DFLAGS 1633 #undef PERR_DADDR 1634 #undef PERR_DSEQ 1635 #undef PERR_DEXTADDR 1636 1637 static int 1638 hwmp_send_perr(struct ieee80211vap *vap, 1639 const uint8_t da[IEEE80211_ADDR_LEN], 1640 struct ieee80211_meshperr_ie *perr) 1641 { 1642 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1643 int i; 1644 uint8_t length = 0; 1645 1646 /* 1647 * Enforce PERR interval. 1648 */ 1649 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0) 1650 return EALREADY; 1651 getmicrouptime(&hs->hs_lastperr); 1652 1653 /* 1654 * mesh perr action frame format 1655 * [6] da 1656 * [6] sa 1657 * [6] addr3 = sa 1658 * [1] action 1659 * [1] category 1660 * [tlv] mesh path error 1661 */ 1662 perr->perr_ie = IEEE80211_ELEMID_MESHPERR; 1663 length = IEEE80211_MESHPERR_BASE_SZ; 1664 for (i = 0; i<perr->perr_ndests; i++) { 1665 if (perr->perr_dests[i].dest_flags & 1666 IEEE80211_MESHPERR_FLAGS_AE) { 1667 length += IEEE80211_MESHPERR_DEST_SZ_AE; 1668 continue ; 1669 } 1670 length += IEEE80211_MESHPERR_DEST_SZ; 1671 } 1672 perr->perr_len =length; 1673 return hwmp_send_action(vap, da, (uint8_t *)perr, perr->perr_len+2); 1674 } 1675 1676 /* 1677 * Called from the rest of the net80211 code (mesh code for example). 1678 * NB: IEEE80211_REASON_MESH_PERR_DEST_UNREACH can be trigger by the fact that 1679 * a mesh STA is unable to forward an MSDU/MMPDU to a next-hop mesh STA. 1680 */ 1681 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1682 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1683 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1684 #define PERR_DEXTADDR(n) perr.perr_dests[n].dest_ext_addr 1685 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1686 static void 1687 hwmp_senderror(struct ieee80211vap *vap, 1688 const uint8_t addr[IEEE80211_ADDR_LEN], 1689 struct ieee80211_mesh_route *rt, int rcode) 1690 { 1691 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1692 struct ieee80211_hwmp_route *hr = NULL; 1693 struct ieee80211_meshperr_ie perr; 1694 1695 if (rt != NULL) 1696 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1697 struct ieee80211_hwmp_route); 1698 1699 perr.perr_ndests = 1; 1700 perr.perr_ttl = ms->ms_ttl; 1701 PERR_DFLAGS(0) = 0; 1702 PERR_DRCODE(0) = rcode; 1703 1704 switch (rcode) { 1705 case IEEE80211_REASON_MESH_PERR_NO_FI: 1706 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr); 1707 PERR_DSEQ(0) = 0; /* reserved */ 1708 break; 1709 case IEEE80211_REASON_MESH_PERR_NO_PROXY: 1710 KASSERT(rt != NULL, ("no proxy info for sending PERR")); 1711 KASSERT(rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY, 1712 ("route is not marked proxy")); 1713 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_FLAGS_AE; 1714 IEEE80211_ADDR_COPY(PERR_DADDR(0), vap->iv_myaddr); 1715 PERR_DSEQ(0) = rt->rt_ext_seq; 1716 IEEE80211_ADDR_COPY(PERR_DEXTADDR(0), addr); 1717 break; 1718 case IEEE80211_REASON_MESH_PERR_DEST_UNREACH: 1719 KASSERT(rt != NULL, ("no route info for sending PERR")); 1720 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr); 1721 PERR_DSEQ(0) = hr->hr_seq; 1722 break; 1723 default: 1724 KASSERT(0, ("unknown reason code for HWMP PERR (%u)", rcode)); 1725 } 1726 hwmp_send_perr(vap, broadcastaddr, &perr); 1727 } 1728 #undef PERR_DFLAGS 1729 #undef PEER_DADDR 1730 #undef PERR_DSEQ 1731 #undef PERR_DEXTADDR 1732 #undef PERR_DRCODE 1733 1734 static void 1735 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni, 1736 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann) 1737 { 1738 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1739 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1740 struct ieee80211_mesh_route *rt = NULL; 1741 struct ieee80211_hwmp_route *hr; 1742 struct ieee80211_meshpreq_ie preq; 1743 struct ieee80211_meshrann_ie prann; 1744 1745 if (IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr)) 1746 return; 1747 1748 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr); 1749 if (rt != NULL && rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) { 1750 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1751 1752 /* Acceptance criteria: if RANN.seq < stored seq, discard RANN */ 1753 if (HWMP_SEQ_LT(rann->rann_seq, hr->hr_seq)) { 1754 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1755 "RANN seq %u < %u", rann->rann_seq, hr->hr_seq); 1756 return; 1757 } 1758 1759 /* Acceptance criteria: if RANN.seq == stored seq AND 1760 * RANN.metric > stored metric, discard RANN */ 1761 if (HWMP_SEQ_EQ(rann->rann_seq, hr->hr_seq) && 1762 rann->rann_metric > rt->rt_metric) { 1763 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1764 "RANN metric %u > %u", rann->rann_metric, rt->rt_metric); 1765 return; 1766 } 1767 } 1768 1769 /* RANN ACCEPTED */ 1770 1771 ieee80211_hwmp_rannint = rann->rann_interval; /* XXX: mtx lock? */ 1772 1773 if (rt == NULL) { 1774 rt = ieee80211_mesh_rt_add(vap, rann->rann_addr); 1775 if (rt == NULL) { 1776 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1777 "unable to add mac for RANN root %6D", 1778 rann->rann_addr, ":"); 1779 vap->iv_stats.is_mesh_rtaddfailed++; 1780 return; 1781 } 1782 } 1783 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1784 /* Check if root is a mesh gate, mark it */ 1785 if (rann->rann_flags & IEEE80211_MESHRANN_FLAGS_GATE) { 1786 struct ieee80211_mesh_gate_route *gr; 1787 1788 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE; 1789 gr = ieee80211_mesh_mark_gate(vap, rann->rann_addr, 1790 rt); 1791 gr->gr_lastseq = 0; /* NOT GANN */ 1792 } 1793 /* discovery timeout */ 1794 ieee80211_mesh_rt_update(rt, 1795 ticks_to_msecs(ieee80211_hwmp_roottimeout)); 1796 1797 preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM; 1798 preq.preq_hopcount = 0; 1799 preq.preq_ttl = ms->ms_ttl; 1800 preq.preq_id = 0; /* reserved */ 1801 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1802 preq.preq_origseq = ++hs->hs_seq; 1803 preq.preq_lifetime = ieee80211_hwmp_roottimeout; 1804 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1805 preq.preq_tcount = 1; 1806 preq.preq_targets[0].target_flags = IEEE80211_MESHPREQ_TFLAGS_TO; 1807 /* NB: IEEE80211_MESHPREQ_TFLAGS_USN = 0 implicitly implied */ 1808 IEEE80211_ADDR_COPY(preq.preq_targets[0].target_addr, rann->rann_addr); 1809 preq.preq_targets[0].target_seq = rann->rann_seq; 1810 /* XXX: if rootconfint have not passed, we built this preq in vain */ 1811 hwmp_send_preq(vap, wh->i_addr2, &preq, &hr->hr_lastrootconf, 1812 &ieee80211_hwmp_rootconfint); 1813 1814 /* propagate a RANN */ 1815 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1816 rann->rann_ttl > 1 && 1817 ms->ms_flags & IEEE80211_MESHFLAGS_FWD) { 1818 hr->hr_seq = rann->rann_seq; 1819 memcpy(&prann, rann, sizeof(prann)); 1820 prann.rann_hopcount += 1; 1821 prann.rann_ttl -= 1; 1822 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni); 1823 hwmp_send_rann(vap, broadcastaddr, &prann); 1824 } 1825 } 1826 1827 static int 1828 hwmp_send_rann(struct ieee80211vap *vap, 1829 const uint8_t da[IEEE80211_ADDR_LEN], 1830 struct ieee80211_meshrann_ie *rann) 1831 { 1832 /* 1833 * mesh rann action frame format 1834 * [6] da 1835 * [6] sa 1836 * [6] addr3 = sa 1837 * [1] action 1838 * [1] category 1839 * [tlv] root announcement 1840 */ 1841 rann->rann_ie = IEEE80211_ELEMID_MESHRANN; 1842 rann->rann_len = IEEE80211_MESHRANN_BASE_SZ; 1843 return hwmp_send_action(vap, da, (uint8_t *)rann, rann->rann_len + 2); 1844 } 1845 1846 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 1847 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr 1848 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 1849 static void 1850 hwmp_rediscover_cb(void *arg) 1851 { 1852 struct ieee80211_mesh_route *rt = arg; 1853 struct ieee80211vap *vap = rt->rt_vap; 1854 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1855 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1856 struct ieee80211_hwmp_route *hr; 1857 struct ieee80211_meshpreq_ie preq; /* Optimize: storing first preq? */ 1858 1859 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) 1860 return ; /* nothing to do */ 1861 1862 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1863 if (hr->hr_preqretries >= 1864 ieee80211_hwmp_maxpreq_retries) { 1865 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, 1866 rt->rt_dest, "%s", 1867 "max number of discovery, send queued frames to GATE"); 1868 ieee80211_mesh_forward_to_gates(vap, rt); 1869 vap->iv_stats.is_mesh_fwd_nopath++; 1870 return ; /* XXX: flush queue? */ 1871 } 1872 1873 hr->hr_preqretries++; 1874 1875 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, rt->rt_dest, 1876 "start path rediscovery , target seq %u", hr->hr_seq); 1877 /* 1878 * Try to discover the path for this node. 1879 * Group addressed PREQ Case A 1880 */ 1881 preq.preq_flags = 0; 1882 preq.preq_hopcount = 0; 1883 preq.preq_ttl = ms->ms_ttl; 1884 preq.preq_id = ++hs->hs_preqid; 1885 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1886 preq.preq_origseq = hr->hr_origseq; 1887 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_pathtimeout); 1888 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1889 preq.preq_tcount = 1; 1890 IEEE80211_ADDR_COPY(PREQ_TADDR(0), rt->rt_dest); 1891 PREQ_TFLAGS(0) = 0; 1892 if (ieee80211_hwmp_targetonly) 1893 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 1894 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 1895 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */ 1896 /* XXX check return value */ 1897 hwmp_send_preq(vap, broadcastaddr, &preq, &hr->hr_lastpreq, 1898 &ieee80211_hwmp_preqminint); 1899 callout_reset(&rt->rt_discovery, 1900 ieee80211_hwmp_net_diameter_traversaltime * 2, 1901 hwmp_rediscover_cb, rt); 1902 } 1903 1904 static struct ieee80211_node * 1905 hwmp_discover(struct ieee80211vap *vap, 1906 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m) 1907 { 1908 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1909 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1910 struct ieee80211_mesh_route *rt = NULL; 1911 struct ieee80211_hwmp_route *hr; 1912 struct ieee80211_meshpreq_ie preq; 1913 struct ieee80211_node *ni; 1914 int sendpreq = 0; 1915 1916 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1917 ("not a mesh vap, opmode %d", vap->iv_opmode)); 1918 1919 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest), 1920 ("%s: discovering self!", __func__)); 1921 1922 ni = NULL; 1923 if (!IEEE80211_IS_MULTICAST(dest)) { 1924 rt = ieee80211_mesh_rt_find(vap, dest); 1925 if (rt == NULL) { 1926 rt = ieee80211_mesh_rt_add(vap, dest); 1927 if (rt == NULL) { 1928 IEEE80211_DPRINTF(vap, IEEE80211_MSG_HWMP, 1929 "unable to add discovery path to %6D", 1930 dest, ":"); 1931 vap->iv_stats.is_mesh_rtaddfailed++; 1932 goto done; 1933 } 1934 } 1935 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1936 struct ieee80211_hwmp_route); 1937 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) { 1938 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1939 "%s", "already discovering queue frame until path found"); 1940 sendpreq = 1; 1941 goto done; 1942 } 1943 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) { 1944 if (hr->hr_lastdiscovery != 0 && 1945 (ticks - hr->hr_lastdiscovery < 1946 (ieee80211_hwmp_net_diameter_traversaltime * 2))) { 1947 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 1948 dest, NULL, "%s", 1949 "too frequent discovery requeust"); 1950 sendpreq = 1; 1951 goto done; 1952 } 1953 hr->hr_lastdiscovery = ticks; 1954 if (hr->hr_preqretries >= 1955 ieee80211_hwmp_maxpreq_retries) { 1956 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 1957 dest, NULL, "%s", 1958 "no valid path , max number of discovery"); 1959 vap->iv_stats.is_mesh_fwd_nopath++; 1960 goto done; 1961 } 1962 rt->rt_flags = IEEE80211_MESHRT_FLAGS_DISCOVER; 1963 hr->hr_preqretries++; 1964 if (hr->hr_origseq == 0) 1965 hr->hr_origseq = ++hs->hs_seq; 1966 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1967 sendpreq = 1; 1968 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1969 "start path discovery (src %s), target seq %u", 1970 m == NULL ? "<none>" : ether_sprintf( 1971 mtod(m, struct ether_header *)->ether_shost), 1972 hr->hr_seq); 1973 /* 1974 * Try to discover the path for this node. 1975 * Group addressed PREQ Case A 1976 */ 1977 preq.preq_flags = 0; 1978 preq.preq_hopcount = 0; 1979 preq.preq_ttl = ms->ms_ttl; 1980 preq.preq_id = ++hs->hs_preqid; 1981 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1982 preq.preq_origseq = hr->hr_origseq; 1983 preq.preq_lifetime = 1984 ticks_to_msecs(ieee80211_hwmp_pathtimeout); 1985 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1986 preq.preq_tcount = 1; 1987 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest); 1988 PREQ_TFLAGS(0) = 0; 1989 if (ieee80211_hwmp_targetonly) 1990 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 1991 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 1992 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */ 1993 /* XXX check return value */ 1994 hwmp_send_preq(vap, broadcastaddr, &preq, 1995 &hr->hr_lastpreq, &ieee80211_hwmp_preqminint); 1996 callout_reset(&rt->rt_discovery, 1997 ieee80211_hwmp_net_diameter_traversaltime * 2, 1998 hwmp_rediscover_cb, rt); 1999 } 2000 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) 2001 ni = ieee80211_find_txnode(vap, rt->rt_nexthop); 2002 } else { 2003 ni = ieee80211_find_txnode(vap, dest); 2004 /* NB: if null then we leak mbuf */ 2005 KASSERT(ni != NULL, ("leak mcast frame")); 2006 return ni; 2007 } 2008 done: 2009 if (ni == NULL && m != NULL) { 2010 if (sendpreq) { 2011 struct ieee80211com *ic = vap->iv_ic; 2012 /* 2013 * Queue packet for transmit when path discovery 2014 * completes. If discovery never completes the 2015 * frame will be flushed by way of the aging timer. 2016 */ 2017 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 2018 "%s", "queue frame until path found"); 2019 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 2020 m->m_pkthdr.rcvif = (void *)(uintptr_t) 2021 ieee80211_mac_hash(ic, dest); 2022 /* XXX age chosen randomly */ 2023 ieee80211_ageq_append(&ic->ic_stageq, m, 2024 IEEE80211_INACT_WAIT); 2025 } else { 2026 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 2027 dest, NULL, "%s", "no valid path to this node"); 2028 m_freem(m); 2029 } 2030 } 2031 return ni; 2032 } 2033 #undef PREQ_TFLAGS 2034 #undef PREQ_TADDR 2035 #undef PREQ_TSEQ 2036 2037 static int 2038 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 2039 { 2040 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 2041 int error; 2042 2043 if (vap->iv_opmode != IEEE80211_M_MBSS) 2044 return ENOSYS; 2045 error = 0; 2046 switch (ireq->i_type) { 2047 case IEEE80211_IOC_HWMP_ROOTMODE: 2048 ireq->i_val = hs->hs_rootmode; 2049 break; 2050 case IEEE80211_IOC_HWMP_MAXHOPS: 2051 ireq->i_val = hs->hs_maxhops; 2052 break; 2053 default: 2054 return ENOSYS; 2055 } 2056 return error; 2057 } 2058 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211); 2059 2060 static int 2061 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 2062 { 2063 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 2064 int error; 2065 2066 if (vap->iv_opmode != IEEE80211_M_MBSS) 2067 return ENOSYS; 2068 error = 0; 2069 switch (ireq->i_type) { 2070 case IEEE80211_IOC_HWMP_ROOTMODE: 2071 if (ireq->i_val < 0 || ireq->i_val > 3) 2072 return EINVAL; 2073 hs->hs_rootmode = ireq->i_val; 2074 hwmp_rootmode_setup(vap); 2075 break; 2076 case IEEE80211_IOC_HWMP_MAXHOPS: 2077 if (ireq->i_val <= 0 || ireq->i_val > 255) 2078 return EINVAL; 2079 hs->hs_maxhops = ireq->i_val; 2080 break; 2081 default: 2082 return ENOSYS; 2083 } 2084 return error; 2085 } 2086 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211); 2087