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sys/net80211/ieee80211_hwmp.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 #include <sys/cdefs.h> 31 #ifdef __FreeBSD__ 32 __FBSDID("$FreeBSD$"); 33 #endif 34 35 /* 36 * IEEE 802.11s Hybrid Wireless Mesh Protocol, HWMP. 37 * 38 * Based on March 2009, D3.0 802.11s draft spec. 39 */ 40 #include "opt_inet.h" 41 #include "opt_wlan.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/mbuf.h> 46 #include <sys/malloc.h> 47 #include <sys/kernel.h> 48 49 #include <sys/socket.h> 50 #include <sys/sockio.h> 51 #include <sys/endian.h> 52 #include <sys/errno.h> 53 #include <sys/proc.h> 54 #include <sys/sysctl.h> 55 56 #include <net/if.h> 57 #include <net/if_media.h> 58 #include <net/if_llc.h> 59 #include <net/ethernet.h> 60 61 #include <net/bpf.h> 62 63 #include <net80211/ieee80211_var.h> 64 #include <net80211/ieee80211_action.h> 65 #include <net80211/ieee80211_input.h> 66 #include <net80211/ieee80211_mesh.h> 67 68 static void hwmp_vattach(struct ieee80211vap *); 69 static void hwmp_vdetach(struct ieee80211vap *); 70 static int hwmp_newstate(struct ieee80211vap *, 71 enum ieee80211_state, int); 72 static int hwmp_send_action(struct ieee80211vap *, 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 ieee80211vap *, 90 const uint8_t [IEEE80211_ADDR_LEN], 91 struct ieee80211_meshpreq_ie *, 92 struct timeval *, struct timeval *); 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 ieee80211vap *, 97 const uint8_t [IEEE80211_ADDR_LEN], 98 struct ieee80211_meshprep_ie *); 99 static void hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *, 100 const struct ieee80211_frame *, 101 const struct ieee80211_meshperr_ie *); 102 static int hwmp_send_perr(struct ieee80211vap *, 103 const uint8_t [IEEE80211_ADDR_LEN], 104 struct ieee80211_meshperr_ie *); 105 static void hwmp_senderror(struct ieee80211vap *, 106 const uint8_t [IEEE80211_ADDR_LEN], 107 struct ieee80211_mesh_route *, int); 108 static void hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *, 109 const struct ieee80211_frame *, 110 const struct ieee80211_meshrann_ie *); 111 static int hwmp_send_rann(struct ieee80211vap *, 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 /* NB: the Target Address set in a Proactive PREQ is the broadcast address. */ 123 static const uint8_t broadcastaddr[IEEE80211_ADDR_LEN] = 124 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 125 126 typedef uint32_t ieee80211_hwmp_seq; 127 #define HWMP_SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0) 128 #define HWMP_SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0) 129 #define HWMP_SEQ_EQ(a, b) ((int32_t)((a)-(b)) == 0) 130 #define HWMP_SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0) 131 132 #define HWMP_SEQ_MAX(a, b) (a > b ? a : b) 133 134 /* 135 * Private extension of ieee80211_mesh_route. 136 */ 137 struct ieee80211_hwmp_route { 138 ieee80211_hwmp_seq hr_seq; /* last HWMP seq seen from dst*/ 139 ieee80211_hwmp_seq hr_preqid; /* last PREQ ID seen from dst */ 140 ieee80211_hwmp_seq hr_origseq; /* seq. no. on our latest PREQ*/ 141 struct timeval hr_lastpreq; /* last time we sent a PREQ */ 142 struct timeval hr_lastrootconf; /* last sent PREQ root conf */ 143 int hr_preqretries; /* number of discoveries */ 144 int hr_lastdiscovery; /* last discovery in ticks */ 145 }; 146 struct ieee80211_hwmp_state { 147 ieee80211_hwmp_seq hs_seq; /* next seq to be used */ 148 ieee80211_hwmp_seq hs_preqid; /* next PREQ ID to be used */ 149 int hs_rootmode; /* proactive HWMP */ 150 struct timeval hs_lastperr; /* last time we sent a PERR */ 151 struct callout hs_roottimer; 152 uint8_t hs_maxhops; /* max hop count */ 153 }; 154 155 static SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 156 "IEEE 802.11s HWMP parameters"); 157 static int ieee80211_hwmp_targetonly = 0; 158 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLFLAG_RW, 159 &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs"); 160 static int ieee80211_hwmp_pathtimeout = -1; 161 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, 162 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 163 &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I", 164 "path entry lifetime (ms)"); 165 static int ieee80211_hwmp_maxpreq_retries = -1; 166 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, maxpreq_retries, 167 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 168 &ieee80211_hwmp_maxpreq_retries, 0, ieee80211_sysctl_msecs_ticks, "I", 169 "maximum number of preq retries"); 170 static int ieee80211_hwmp_net_diameter_traversaltime = -1; 171 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, net_diameter_traversal_time, 172 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 173 &ieee80211_hwmp_net_diameter_traversaltime, 0, 174 ieee80211_sysctl_msecs_ticks, "I", 175 "estimate traversal time across the MBSS (ms)"); 176 static int ieee80211_hwmp_roottimeout = -1; 177 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, 178 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 179 &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I", 180 "root PREQ timeout (ms)"); 181 static int ieee80211_hwmp_rootint = -1; 182 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, 183 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 184 &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I", 185 "root interval (ms)"); 186 static int ieee80211_hwmp_rannint = -1; 187 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, 188 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 189 &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I", 190 "root announcement interval (ms)"); 191 static struct timeval ieee80211_hwmp_rootconfint = { 0, 0 }; 192 static int ieee80211_hwmp_rootconfint_internal = -1; 193 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootconfint, 194 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 195 &ieee80211_hwmp_rootconfint_internal, 0, ieee80211_sysctl_msecs_ticks, "I", 196 "root confirmation interval (ms) (read-only)"); 197 198 #define IEEE80211_HWMP_DEFAULT_MAXHOPS 31 199 200 static ieee80211_recv_action_func hwmp_recv_action_meshpath; 201 202 static struct ieee80211_mesh_proto_path mesh_proto_hwmp = { 203 .mpp_descr = "HWMP", 204 .mpp_ie = IEEE80211_MESHCONF_PATH_HWMP, 205 .mpp_discover = hwmp_discover, 206 .mpp_peerdown = hwmp_peerdown, 207 .mpp_senderror = hwmp_senderror, 208 .mpp_vattach = hwmp_vattach, 209 .mpp_vdetach = hwmp_vdetach, 210 .mpp_newstate = hwmp_newstate, 211 .mpp_privlen = sizeof(struct ieee80211_hwmp_route), 212 }; 213 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact, 214 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 215 &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I", 216 "mesh route inactivity timeout (ms)"); 217 218 static void 219 ieee80211_hwmp_init(void) 220 { 221 /* Default values as per amendment */ 222 ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000); 223 ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000); 224 ieee80211_hwmp_rootint = msecs_to_ticks(2*1000); 225 ieee80211_hwmp_rannint = msecs_to_ticks(1*1000); 226 ieee80211_hwmp_rootconfint_internal = msecs_to_ticks(2*1000); 227 ieee80211_hwmp_maxpreq_retries = 3; 228 /* 229 * (TU): A measurement of time equal to 1024 μs, 230 * 500 TU is 512 ms. 231 */ 232 ieee80211_hwmp_net_diameter_traversaltime = msecs_to_ticks(512); 233 234 /* 235 * NB: I dont know how to make SYSCTL_PROC that calls ms to ticks 236 * and return a struct timeval... 237 */ 238 ieee80211_hwmp_rootconfint.tv_usec = 239 ieee80211_hwmp_rootconfint_internal * 1000; 240 241 /* 242 * Register action frame handler. 243 */ 244 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESH, 245 IEEE80211_ACTION_MESH_HWMP, hwmp_recv_action_meshpath); 246 247 /* NB: default is 5 secs per spec */ 248 mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000); 249 250 /* 251 * Register HWMP. 252 */ 253 ieee80211_mesh_register_proto_path(&mesh_proto_hwmp); 254 } 255 SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL); 256 257 static void 258 hwmp_vattach(struct ieee80211vap *vap) 259 { 260 struct ieee80211_hwmp_state *hs; 261 262 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 263 ("not a mesh vap, opmode %d", vap->iv_opmode)); 264 265 hs = IEEE80211_MALLOC(sizeof(struct ieee80211_hwmp_state), M_80211_VAP, 266 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 267 if (hs == NULL) { 268 printf("%s: couldn't alloc HWMP state\n", __func__); 269 return; 270 } 271 hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS; 272 callout_init(&hs->hs_roottimer, 1); 273 vap->iv_hwmp = hs; 274 } 275 276 static void 277 hwmp_vdetach(struct ieee80211vap *vap) 278 { 279 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 280 281 callout_drain(&hs->hs_roottimer); 282 IEEE80211_FREE(vap->iv_hwmp, M_80211_VAP); 283 vap->iv_hwmp = NULL; 284 } 285 286 static int 287 hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg) 288 { 289 enum ieee80211_state nstate = vap->iv_state; 290 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 291 292 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 293 __func__, ieee80211_state_name[ostate], 294 ieee80211_state_name[nstate], arg); 295 296 if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN) 297 callout_drain(&hs->hs_roottimer); 298 if (nstate == IEEE80211_S_RUN) 299 hwmp_rootmode_setup(vap); 300 return 0; 301 } 302 303 /* 304 * Verify the length of an HWMP PREQ and return the number 305 * of destinations >= 1, if verification fails -1 is returned. 306 */ 307 static int 308 verify_mesh_preq_len(struct ieee80211vap *vap, 309 const struct ieee80211_frame *wh, const uint8_t *iefrm) 310 { 311 int alloc_sz = -1; 312 int ndest = -1; 313 if (iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE) { 314 /* Originator External Address present */ 315 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ_AE; 316 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET_AE]; 317 } else { 318 /* w/o Originator External Address */ 319 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ; 320 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET]; 321 } 322 alloc_sz += ndest * IEEE80211_MESHPREQ_TRGT_SZ; 323 324 if(iefrm[1] != (alloc_sz)) { 325 IEEE80211_DISCARD(vap, 326 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 327 wh, NULL, "PREQ (AE=%s) with wrong len", 328 iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE ? "1" : ""); 329 return (-1); 330 } 331 return ndest; 332 } 333 334 /* 335 * Verify the length of an HWMP PREP and returns 1 on success, 336 * otherwise -1. 337 */ 338 static int 339 verify_mesh_prep_len(struct ieee80211vap *vap, 340 const struct ieee80211_frame *wh, const uint8_t *iefrm) 341 { 342 int alloc_sz = -1; 343 if (iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE) { 344 if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ_AE) 345 alloc_sz = IEEE80211_MESHPREP_BASE_SZ_AE; 346 } else if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ) 347 alloc_sz = IEEE80211_MESHPREP_BASE_SZ; 348 if(alloc_sz < 0) { 349 IEEE80211_DISCARD(vap, 350 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 351 wh, NULL, "PREP (AE=%s) with wrong len", 352 iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE ? "1" : ""); 353 return (-1); 354 } 355 return (1); 356 } 357 358 /* 359 * Verify the length of an HWMP PERR and return the number 360 * of destinations >= 1, if verification fails -1 is returned. 361 */ 362 static int 363 verify_mesh_perr_len(struct ieee80211vap *vap, 364 const struct ieee80211_frame *wh, const uint8_t *iefrm) 365 { 366 int alloc_sz = -1; 367 const uint8_t *iefrm_t = iefrm; 368 uint8_t ndest = iefrm_t[IEEE80211_MESHPERR_NDEST_OFFSET]; 369 int i; 370 371 if(ndest > IEEE80211_MESHPERR_MAXDEST) { 372 IEEE80211_DISCARD(vap, 373 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 374 wh, NULL, "PERR with wrong number of destionat (>19), %u", 375 ndest); 376 return (-1); 377 } 378 379 iefrm_t += IEEE80211_MESHPERR_NDEST_OFFSET + 1; /* flag is next field */ 380 /* We need to check each destination flag to know size */ 381 for(i = 0; i<ndest; i++) { 382 if ((*iefrm_t) & IEEE80211_MESHPERR_FLAGS_AE) 383 iefrm_t += IEEE80211_MESHPERR_DEST_SZ_AE; 384 else 385 iefrm_t += IEEE80211_MESHPERR_DEST_SZ; 386 } 387 388 alloc_sz = (iefrm_t - iefrm) - 2; /* action + code */ 389 if(alloc_sz != iefrm[1]) { 390 IEEE80211_DISCARD(vap, 391 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 392 wh, NULL, "%s", "PERR with wrong len"); 393 return (-1); 394 } 395 return ndest; 396 } 397 398 static int 399 hwmp_recv_action_meshpath(struct ieee80211_node *ni, 400 const struct ieee80211_frame *wh, 401 const uint8_t *frm, const uint8_t *efrm) 402 { 403 struct ieee80211vap *vap = ni->ni_vap; 404 struct ieee80211_meshpreq_ie *preq; 405 struct ieee80211_meshprep_ie *prep; 406 struct ieee80211_meshperr_ie *perr; 407 struct ieee80211_meshrann_ie rann; 408 const uint8_t *iefrm = frm + 2; /* action + code */ 409 const uint8_t *iefrm_t = iefrm; /* temporary pointer */ 410 int ndest = -1; 411 int found = 0; 412 413 while (efrm - iefrm > 1) { 414 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0); 415 switch (*iefrm) { 416 case IEEE80211_ELEMID_MESHPREQ: 417 { 418 int i = 0; 419 420 iefrm_t = iefrm; 421 ndest = verify_mesh_preq_len(vap, wh, iefrm_t); 422 if (ndest < 0) { 423 vap->iv_stats.is_rx_mgtdiscard++; 424 break; 425 } 426 preq = IEEE80211_MALLOC(sizeof(*preq) + 427 (ndest - 1) * sizeof(*preq->preq_targets), 428 M_80211_MESH_PREQ, 429 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 430 KASSERT(preq != NULL, ("preq == NULL")); 431 432 preq->preq_ie = *iefrm_t++; 433 preq->preq_len = *iefrm_t++; 434 preq->preq_flags = *iefrm_t++; 435 preq->preq_hopcount = *iefrm_t++; 436 preq->preq_ttl = *iefrm_t++; 437 preq->preq_id = le32dec(iefrm_t); iefrm_t += 4; 438 IEEE80211_ADDR_COPY(preq->preq_origaddr, iefrm_t); 439 iefrm_t += 6; 440 preq->preq_origseq = le32dec(iefrm_t); iefrm_t += 4; 441 /* NB: may have Originator Proxied Address */ 442 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 443 IEEE80211_ADDR_COPY( 444 preq->preq_orig_ext_addr, iefrm_t); 445 iefrm_t += 6; 446 } 447 preq->preq_lifetime = le32dec(iefrm_t); iefrm_t += 4; 448 preq->preq_metric = le32dec(iefrm_t); iefrm_t += 4; 449 preq->preq_tcount = *iefrm_t++; 450 451 for (i = 0; i < preq->preq_tcount; i++) { 452 preq->preq_targets[i].target_flags = *iefrm_t++; 453 IEEE80211_ADDR_COPY( 454 preq->preq_targets[i].target_addr, iefrm_t); 455 iefrm_t += 6; 456 preq->preq_targets[i].target_seq = 457 le32dec(iefrm_t); 458 iefrm_t += 4; 459 } 460 461 hwmp_recv_preq(vap, ni, wh, preq); 462 IEEE80211_FREE(preq, M_80211_MESH_PREQ); 463 found++; 464 break; 465 } 466 case IEEE80211_ELEMID_MESHPREP: 467 { 468 iefrm_t = iefrm; 469 ndest = verify_mesh_prep_len(vap, wh, iefrm_t); 470 if (ndest < 0) { 471 vap->iv_stats.is_rx_mgtdiscard++; 472 break; 473 } 474 prep = IEEE80211_MALLOC(sizeof(*prep), 475 M_80211_MESH_PREP, 476 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 477 KASSERT(prep != NULL, ("prep == NULL")); 478 479 prep->prep_ie = *iefrm_t++; 480 prep->prep_len = *iefrm_t++; 481 prep->prep_flags = *iefrm_t++; 482 prep->prep_hopcount = *iefrm_t++; 483 prep->prep_ttl = *iefrm_t++; 484 IEEE80211_ADDR_COPY(prep->prep_targetaddr, iefrm_t); 485 iefrm_t += 6; 486 prep->prep_targetseq = le32dec(iefrm_t); iefrm_t += 4; 487 /* NB: May have Target Proxied Address */ 488 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 489 IEEE80211_ADDR_COPY( 490 prep->prep_target_ext_addr, iefrm_t); 491 iefrm_t += 6; 492 } 493 prep->prep_lifetime = le32dec(iefrm_t); iefrm_t += 4; 494 prep->prep_metric = le32dec(iefrm_t); iefrm_t += 4; 495 IEEE80211_ADDR_COPY(prep->prep_origaddr, iefrm_t); 496 iefrm_t += 6; 497 prep->prep_origseq = le32dec(iefrm_t); iefrm_t += 4; 498 499 hwmp_recv_prep(vap, ni, wh, prep); 500 IEEE80211_FREE(prep, M_80211_MESH_PREP); 501 found++; 502 break; 503 } 504 case IEEE80211_ELEMID_MESHPERR: 505 { 506 int i = 0; 507 508 iefrm_t = iefrm; 509 ndest = verify_mesh_perr_len(vap, wh, iefrm_t); 510 if (ndest < 0) { 511 vap->iv_stats.is_rx_mgtdiscard++; 512 break; 513 } 514 perr = IEEE80211_MALLOC(sizeof(*perr) + 515 (ndest - 1) * sizeof(*perr->perr_dests), 516 M_80211_MESH_PERR, 517 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 518 KASSERT(perr != NULL, ("perr == NULL")); 519 520 perr->perr_ie = *iefrm_t++; 521 perr->perr_len = *iefrm_t++; 522 perr->perr_ttl = *iefrm_t++; 523 perr->perr_ndests = *iefrm_t++; 524 525 for (i = 0; i<perr->perr_ndests; i++) { 526 perr->perr_dests[i].dest_flags = *iefrm_t++; 527 IEEE80211_ADDR_COPY( 528 perr->perr_dests[i].dest_addr, iefrm_t); 529 iefrm_t += 6; 530 perr->perr_dests[i].dest_seq = le32dec(iefrm_t); 531 iefrm_t += 4; 532 /* NB: May have Target Proxied Address */ 533 if (perr->perr_dests[i].dest_flags & 534 IEEE80211_MESHPERR_FLAGS_AE) { 535 IEEE80211_ADDR_COPY( 536 perr->perr_dests[i].dest_ext_addr, 537 iefrm_t); 538 iefrm_t += 6; 539 } 540 perr->perr_dests[i].dest_rcode = 541 le16dec(iefrm_t); 542 iefrm_t += 2; 543 } 544 545 hwmp_recv_perr(vap, ni, wh, perr); 546 IEEE80211_FREE(perr, M_80211_MESH_PERR); 547 found++; 548 break; 549 } 550 case IEEE80211_ELEMID_MESHRANN: 551 { 552 const struct ieee80211_meshrann_ie *mrann = 553 (const struct ieee80211_meshrann_ie *) iefrm; 554 if (mrann->rann_len != 555 sizeof(struct ieee80211_meshrann_ie) - 2) { 556 IEEE80211_DISCARD(vap, 557 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 558 wh, NULL, "%s", "RAN with wrong len"); 559 vap->iv_stats.is_rx_mgtdiscard++; 560 return 1; 561 } 562 memcpy(&rann, mrann, sizeof(rann)); 563 rann.rann_seq = le32dec(&mrann->rann_seq); 564 rann.rann_interval = le32dec(&mrann->rann_interval); 565 rann.rann_metric = le32dec(&mrann->rann_metric); 566 hwmp_recv_rann(vap, ni, wh, &rann); 567 found++; 568 break; 569 } 570 } 571 iefrm += iefrm[1] + 2; 572 } 573 if (!found) { 574 IEEE80211_DISCARD(vap, 575 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 576 wh, NULL, "%s", "PATH SEL action without IE"); 577 vap->iv_stats.is_rx_mgtdiscard++; 578 } 579 return 0; 580 } 581 582 static int 583 hwmp_send_action(struct ieee80211vap *vap, 584 const uint8_t da[IEEE80211_ADDR_LEN], 585 uint8_t *ie, size_t len) 586 { 587 struct ieee80211_node *ni; 588 struct ieee80211com *ic; 589 struct ieee80211_bpf_params params; 590 struct mbuf *m; 591 uint8_t *frm; 592 int ret; 593 594 if (IEEE80211_IS_MULTICAST(da)) { 595 ni = ieee80211_ref_node(vap->iv_bss); 596 #ifdef IEEE80211_DEBUG_REFCNT 597 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 598 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 599 __func__, __LINE__, 600 ni, ether_sprintf(ni->ni_macaddr), 601 ieee80211_node_refcnt(ni)+1); 602 #endif 603 ieee80211_ref_node(ni); 604 } 605 else 606 ni = ieee80211_mesh_find_txnode(vap, da); 607 608 if (vap->iv_state == IEEE80211_S_CAC) { 609 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 610 "block %s frame in CAC state", "HWMP action"); 611 vap->iv_stats.is_tx_badstate++; 612 return EIO; /* XXX */ 613 } 614 615 KASSERT(ni != NULL, ("null node")); 616 ic = ni->ni_ic; 617 618 m = ieee80211_getmgtframe(&frm, 619 ic->ic_headroom + sizeof(struct ieee80211_frame), 620 sizeof(struct ieee80211_action) + len 621 ); 622 if (m == NULL) { 623 ieee80211_free_node(ni); 624 vap->iv_stats.is_tx_nobuf++; 625 return ENOMEM; 626 } 627 *frm++ = IEEE80211_ACTION_CAT_MESH; 628 *frm++ = IEEE80211_ACTION_MESH_HWMP; 629 switch (*ie) { 630 case IEEE80211_ELEMID_MESHPREQ: 631 frm = hwmp_add_meshpreq(frm, 632 (struct ieee80211_meshpreq_ie *)ie); 633 break; 634 case IEEE80211_ELEMID_MESHPREP: 635 frm = hwmp_add_meshprep(frm, 636 (struct ieee80211_meshprep_ie *)ie); 637 break; 638 case IEEE80211_ELEMID_MESHPERR: 639 frm = hwmp_add_meshperr(frm, 640 (struct ieee80211_meshperr_ie *)ie); 641 break; 642 case IEEE80211_ELEMID_MESHRANN: 643 frm = hwmp_add_meshrann(frm, 644 (struct ieee80211_meshrann_ie *)ie); 645 break; 646 } 647 648 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 649 M_PREPEND(m, sizeof(struct ieee80211_frame), IEEE80211_M_NOWAIT); 650 if (m == NULL) { 651 ieee80211_free_node(ni); 652 vap->iv_stats.is_tx_nobuf++; 653 return ENOMEM; 654 } 655 656 IEEE80211_TX_LOCK(ic); 657 658 ieee80211_send_setup(ni, m, 659 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION, 660 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, vap->iv_myaddr); 661 662 m->m_flags |= M_ENCAP; /* mark encapsulated */ 663 IEEE80211_NODE_STAT(ni, tx_mgmt); 664 665 memset(¶ms, 0, sizeof(params)); 666 params.ibp_pri = WME_AC_VO; 667 params.ibp_rate0 = ni->ni_txparms->mgmtrate; 668 if (IEEE80211_IS_MULTICAST(da)) 669 params.ibp_try0 = 1; 670 else 671 params.ibp_try0 = ni->ni_txparms->maxretry; 672 params.ibp_power = ni->ni_txpower; 673 ret = ieee80211_raw_output(vap, ni, m, ¶ms); 674 IEEE80211_TX_UNLOCK(ic); 675 return (ret); 676 } 677 678 #define ADDSHORT(frm, v) do { \ 679 le16enc(frm, v); \ 680 frm += 2; \ 681 } while (0) 682 #define ADDWORD(frm, v) do { \ 683 le32enc(frm, v); \ 684 frm += 4; \ 685 } while (0) 686 /* 687 * Add a Mesh Path Request IE to a frame. 688 */ 689 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags 690 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr 691 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq 692 static uint8_t * 693 hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq) 694 { 695 int i; 696 697 *frm++ = IEEE80211_ELEMID_MESHPREQ; 698 *frm++ = preq->preq_len; /* len already calculated */ 699 *frm++ = preq->preq_flags; 700 *frm++ = preq->preq_hopcount; 701 *frm++ = preq->preq_ttl; 702 ADDWORD(frm, preq->preq_id); 703 IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6; 704 ADDWORD(frm, preq->preq_origseq); 705 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 706 IEEE80211_ADDR_COPY(frm, preq->preq_orig_ext_addr); 707 frm += 6; 708 } 709 ADDWORD(frm, preq->preq_lifetime); 710 ADDWORD(frm, preq->preq_metric); 711 *frm++ = preq->preq_tcount; 712 for (i = 0; i < preq->preq_tcount; i++) { 713 *frm++ = PREQ_TFLAGS(i); 714 IEEE80211_ADDR_COPY(frm, PREQ_TADDR(i)); 715 frm += 6; 716 ADDWORD(frm, PREQ_TSEQ(i)); 717 } 718 return frm; 719 } 720 #undef PREQ_TFLAGS 721 #undef PREQ_TADDR 722 #undef PREQ_TSEQ 723 724 /* 725 * Add a Mesh Path Reply IE to a frame. 726 */ 727 static uint8_t * 728 hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep) 729 { 730 *frm++ = IEEE80211_ELEMID_MESHPREP; 731 *frm++ = prep->prep_len; /* len already calculated */ 732 *frm++ = prep->prep_flags; 733 *frm++ = prep->prep_hopcount; 734 *frm++ = prep->prep_ttl; 735 IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6; 736 ADDWORD(frm, prep->prep_targetseq); 737 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 738 IEEE80211_ADDR_COPY(frm, prep->prep_target_ext_addr); 739 frm += 6; 740 } 741 ADDWORD(frm, prep->prep_lifetime); 742 ADDWORD(frm, prep->prep_metric); 743 IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6; 744 ADDWORD(frm, prep->prep_origseq); 745 return frm; 746 } 747 748 /* 749 * Add a Mesh Path Error IE to a frame. 750 */ 751 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags 752 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr 753 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 754 #define PERR_EXTADDR(n) perr->perr_dests[n].dest_ext_addr 755 #define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode 756 static uint8_t * 757 hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr) 758 { 759 int i; 760 761 *frm++ = IEEE80211_ELEMID_MESHPERR; 762 *frm++ = perr->perr_len; /* len already calculated */ 763 *frm++ = perr->perr_ttl; 764 *frm++ = perr->perr_ndests; 765 for (i = 0; i < perr->perr_ndests; i++) { 766 *frm++ = PERR_DFLAGS(i); 767 IEEE80211_ADDR_COPY(frm, PERR_DADDR(i)); 768 frm += 6; 769 ADDWORD(frm, PERR_DSEQ(i)); 770 if (PERR_DFLAGS(i) & IEEE80211_MESHPERR_FLAGS_AE) { 771 IEEE80211_ADDR_COPY(frm, PERR_EXTADDR(i)); 772 frm += 6; 773 } 774 ADDSHORT(frm, PERR_DRCODE(i)); 775 } 776 return frm; 777 } 778 #undef PERR_DFLAGS 779 #undef PERR_DADDR 780 #undef PERR_DSEQ 781 #undef PERR_EXTADDR 782 #undef PERR_DRCODE 783 784 /* 785 * Add a Root Annoucement IE to a frame. 786 */ 787 static uint8_t * 788 hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann) 789 { 790 *frm++ = IEEE80211_ELEMID_MESHRANN; 791 *frm++ = rann->rann_len; 792 *frm++ = rann->rann_flags; 793 *frm++ = rann->rann_hopcount; 794 *frm++ = rann->rann_ttl; 795 IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6; 796 ADDWORD(frm, rann->rann_seq); 797 ADDWORD(frm, rann->rann_interval); 798 ADDWORD(frm, rann->rann_metric); 799 return frm; 800 } 801 802 static void 803 hwmp_rootmode_setup(struct ieee80211vap *vap) 804 { 805 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 806 struct ieee80211_mesh_state *ms = vap->iv_mesh; 807 808 switch (hs->hs_rootmode) { 809 case IEEE80211_HWMP_ROOTMODE_DISABLED: 810 callout_drain(&hs->hs_roottimer); 811 ms->ms_flags &= ~IEEE80211_MESHFLAGS_ROOT; 812 break; 813 case IEEE80211_HWMP_ROOTMODE_NORMAL: 814 case IEEE80211_HWMP_ROOTMODE_PROACTIVE: 815 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint, 816 hwmp_rootmode_cb, vap); 817 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT; 818 break; 819 case IEEE80211_HWMP_ROOTMODE_RANN: 820 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint, 821 hwmp_rootmode_rann_cb, vap); 822 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT; 823 break; 824 } 825 } 826 827 /* 828 * Send a broadcast Path Request to find all nodes on the mesh. We are 829 * called when the vap is configured as a HWMP root node. 830 */ 831 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 832 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr 833 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 834 static void 835 hwmp_rootmode_cb(void *arg) 836 { 837 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 838 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 839 struct ieee80211_mesh_state *ms = vap->iv_mesh; 840 struct ieee80211_meshpreq_ie preq; 841 842 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 843 "%s", "send broadcast PREQ"); 844 845 preq.preq_flags = 0; 846 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE) 847 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_GATE; 848 if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE) 849 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP; 850 preq.preq_hopcount = 0; 851 preq.preq_ttl = ms->ms_ttl; 852 preq.preq_id = ++hs->hs_preqid; 853 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 854 preq.preq_origseq = ++hs->hs_seq; 855 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout); 856 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 857 preq.preq_tcount = 1; 858 IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr); 859 PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO | 860 IEEE80211_MESHPREQ_TFLAGS_USN; 861 PREQ_TSEQ(0) = 0; 862 vap->iv_stats.is_hwmp_rootreqs++; 863 /* NB: we enforce rate check ourself */ 864 hwmp_send_preq(vap, broadcastaddr, &preq, NULL, NULL); 865 hwmp_rootmode_setup(vap); 866 } 867 #undef PREQ_TFLAGS 868 #undef PREQ_TADDR 869 #undef PREQ_TSEQ 870 871 /* 872 * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are 873 * called when the vap is configured as a HWMP RANN root node. 874 */ 875 static void 876 hwmp_rootmode_rann_cb(void *arg) 877 { 878 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 879 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 880 struct ieee80211_mesh_state *ms = vap->iv_mesh; 881 struct ieee80211_meshrann_ie rann; 882 883 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 884 "%s", "send broadcast RANN"); 885 886 rann.rann_flags = 0; 887 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE) 888 rann.rann_flags |= IEEE80211_MESHFLAGS_GATE; 889 rann.rann_hopcount = 0; 890 rann.rann_ttl = ms->ms_ttl; 891 IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr); 892 rann.rann_seq = ++hs->hs_seq; 893 rann.rann_interval = ieee80211_hwmp_rannint; 894 rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 895 896 vap->iv_stats.is_hwmp_rootrann++; 897 hwmp_send_rann(vap, broadcastaddr, &rann); 898 hwmp_rootmode_setup(vap); 899 } 900 901 /* 902 * Update forwarding information to TA if metric improves. 903 */ 904 static void 905 hwmp_update_transmitter(struct ieee80211vap *vap, struct ieee80211_node *ni, 906 const char *hwmp_frame) 907 { 908 struct ieee80211_mesh_state *ms = vap->iv_mesh; 909 struct ieee80211_mesh_route *rttran = NULL; /* Transmitter */ 910 int metric = 0; 911 912 rttran = ieee80211_mesh_rt_find(vap, ni->ni_macaddr); 913 if (rttran == NULL) { 914 rttran = ieee80211_mesh_rt_add(vap, ni->ni_macaddr); 915 if (rttran == NULL) { 916 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 917 "unable to add path to transmitter %6D of %s", 918 ni->ni_macaddr, ":", hwmp_frame); 919 vap->iv_stats.is_mesh_rtaddfailed++; 920 return; 921 } 922 } 923 metric = ms->ms_pmetric->mpm_metric(ni); 924 if (!(rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) || 925 rttran->rt_metric > metric) 926 { 927 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 928 "%s path to transmitter %6D of %s, metric %d:%d", 929 rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 930 "prefer" : "update", ni->ni_macaddr, ":", hwmp_frame, 931 rttran->rt_metric, metric); 932 IEEE80211_ADDR_COPY(rttran->rt_nexthop, ni->ni_macaddr); 933 rttran->rt_metric = metric; 934 rttran->rt_nhops = 1; 935 ieee80211_mesh_rt_update(rttran, ms->ms_ppath->mpp_inact); 936 rttran->rt_flags = IEEE80211_MESHRT_FLAGS_VALID; 937 } 938 } 939 940 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags 941 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr 942 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq 943 static void 944 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni, 945 const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq) 946 { 947 struct ieee80211_mesh_state *ms = vap->iv_mesh; 948 struct ieee80211_mesh_route *rtorig = NULL; 949 struct ieee80211_mesh_route *rtorig_ext = NULL; 950 struct ieee80211_mesh_route *rttarg = NULL; 951 struct ieee80211_hwmp_route *hrorig = NULL; 952 struct ieee80211_hwmp_route *hrtarg = NULL; 953 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 954 ieee80211_hwmp_seq preqid; /* last seen preqid for orig */ 955 uint32_t metric = 0; 956 957 /* 958 * Ignore PREQs from us. Could happen because someone forward it 959 * back to us. 960 */ 961 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr)) 962 return; 963 964 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 965 "received PREQ, orig %6D, targ(0) %6D", preq->preq_origaddr, ":", 966 PREQ_TADDR(0), ":"); 967 968 /* 969 * Acceptance criteria: (if the PREQ is not for us or not broadcast, 970 * or an external mac address not proxied by us), 971 * AND forwarding is disabled, discard this PREQ. 972 */ 973 rttarg = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0)); 974 if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD) && 975 (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) || 976 !IEEE80211_IS_MULTICAST(PREQ_TADDR(0)) || 977 (rttarg != NULL && 978 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY && 979 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate)))) { 980 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 981 preq->preq_origaddr, NULL, "%s", "not accepting PREQ"); 982 return; 983 } 984 /* 985 * Acceptance criteria: if unicast addressed 986 * AND no valid forwarding for Target of PREQ, discard this PREQ. 987 */ 988 if(rttarg != NULL) 989 hrtarg = IEEE80211_MESH_ROUTE_PRIV(rttarg, 990 struct ieee80211_hwmp_route); 991 /* Address mode: ucast */ 992 if(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AM && 993 rttarg == NULL && 994 !IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) { 995 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 996 preq->preq_origaddr, NULL, 997 "unicast addressed PREQ of unknown target %6D", 998 PREQ_TADDR(0), ":"); 999 return; 1000 } 1001 1002 /* PREQ ACCEPTED */ 1003 1004 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr); 1005 if (rtorig == NULL) { 1006 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr); 1007 if (rtorig == NULL) { 1008 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1009 "unable to add orig path to %6D", 1010 preq->preq_origaddr, ":"); 1011 vap->iv_stats.is_mesh_rtaddfailed++; 1012 return; 1013 } 1014 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1015 "adding originator %6D", preq->preq_origaddr, ":"); 1016 } 1017 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route); 1018 1019 /* record last seen preqid */ 1020 preqid = hrorig->hr_preqid; 1021 hrorig->hr_preqid = HWMP_SEQ_MAX(hrorig->hr_preqid, preq->preq_id); 1022 1023 /* Data creation and update of forwarding information 1024 * according to Table 11C-8 for originator mesh STA. 1025 */ 1026 metric = preq->preq_metric + ms->ms_pmetric->mpm_metric(ni); 1027 if (HWMP_SEQ_GT(preq->preq_origseq, hrorig->hr_seq) || 1028 (HWMP_SEQ_EQ(preq->preq_origseq, hrorig->hr_seq) && 1029 metric < rtorig->rt_metric)) { 1030 hrorig->hr_seq = preq->preq_origseq; 1031 IEEE80211_ADDR_COPY(rtorig->rt_nexthop, wh->i_addr2); 1032 rtorig->rt_metric = metric; 1033 rtorig->rt_nhops = preq->preq_hopcount + 1; 1034 ieee80211_mesh_rt_update(rtorig, preq->preq_lifetime); 1035 /* Path to orig is valid now. 1036 * NB: we know it can't be Proxy, and if it is GATE 1037 * it will be marked below. 1038 */ 1039 rtorig->rt_flags = IEEE80211_MESHRT_FLAGS_VALID; 1040 } else if ((hrtarg != NULL && 1041 !HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0))) || 1042 (rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1043 preqid >= preq->preq_id)) { 1044 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1045 "discard PREQ from %6D, old seqno %u <= %u," 1046 " or old preqid %u < %u", 1047 preq->preq_origaddr, ":", 1048 preq->preq_origseq, hrorig->hr_seq, 1049 preq->preq_id, preqid); 1050 return; 1051 } 1052 1053 /* Update forwarding information to TA if metric improves. */ 1054 hwmp_update_transmitter(vap, ni, "PREQ"); 1055 1056 /* 1057 * Check if the PREQ is addressed to us. 1058 * or a Proxy currently gated by us. 1059 */ 1060 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) || 1061 (ms->ms_flags & IEEE80211_MESHFLAGS_GATE && 1062 rttarg != NULL && 1063 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate) && 1064 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY && 1065 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 1066 struct ieee80211_meshprep_ie prep; 1067 1068 /* 1069 * When we are the target we shall update our own HWMP seq 1070 * number with max of (current and preq->seq) + 1 1071 */ 1072 hs->hs_seq = HWMP_SEQ_MAX(hs->hs_seq, PREQ_TSEQ(0)) + 1; 1073 1074 prep.prep_flags = 0; 1075 prep.prep_hopcount = 0; 1076 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1077 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr); 1078 if (rttarg != NULL && /* if NULL it means we are the target */ 1079 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1080 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1081 "reply for proxy %6D", rttarg->rt_dest, ":"); 1082 prep.prep_flags |= IEEE80211_MESHPREP_FLAGS_AE; 1083 IEEE80211_ADDR_COPY(prep.prep_target_ext_addr, 1084 rttarg->rt_dest); 1085 /* update proxy seqno to HWMP seqno */ 1086 rttarg->rt_ext_seq = hs->hs_seq; 1087 prep.prep_hopcount = rttarg->rt_nhops; 1088 prep.prep_metric = rttarg->rt_metric; 1089 IEEE80211_ADDR_COPY(prep.prep_targetaddr, rttarg->rt_mesh_gate); 1090 } 1091 /* 1092 * Build and send a PREP frame. 1093 */ 1094 prep.prep_ttl = ms->ms_ttl; 1095 prep.prep_targetseq = hs->hs_seq; 1096 prep.prep_lifetime = preq->preq_lifetime; 1097 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr); 1098 prep.prep_origseq = preq->preq_origseq; 1099 1100 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1101 "reply to %6D", preq->preq_origaddr, ":"); 1102 hwmp_send_prep(vap, wh->i_addr2, &prep); 1103 return; 1104 } 1105 /* we may update our proxy information for the orig external */ 1106 else if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 1107 rtorig_ext = 1108 ieee80211_mesh_rt_find(vap, preq->preq_orig_ext_addr); 1109 if (rtorig_ext == NULL) { 1110 rtorig_ext = ieee80211_mesh_rt_add(vap, 1111 preq->preq_orig_ext_addr); 1112 if (rtorig_ext == NULL) { 1113 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1114 "unable to add orig ext proxy to %6D", 1115 preq->preq_orig_ext_addr, ":"); 1116 vap->iv_stats.is_mesh_rtaddfailed++; 1117 return; 1118 } 1119 IEEE80211_ADDR_COPY(rtorig_ext->rt_mesh_gate, 1120 preq->preq_origaddr); 1121 } 1122 rtorig_ext->rt_ext_seq = preq->preq_origseq; 1123 ieee80211_mesh_rt_update(rtorig_ext, preq->preq_lifetime); 1124 } 1125 /* 1126 * Proactive PREQ: reply with a proactive PREP to the 1127 * root STA if requested. 1128 */ 1129 if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) && 1130 (PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) { 1131 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1132 "root mesh station @ %6D", preq->preq_origaddr, ":"); 1133 1134 /* Check if root is a mesh gate, mark it */ 1135 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_GATE) { 1136 struct ieee80211_mesh_gate_route *gr; 1137 1138 rtorig->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE; 1139 gr = ieee80211_mesh_mark_gate(vap, preq->preq_origaddr, 1140 rtorig); 1141 gr->gr_lastseq = 0; /* NOT GANN */ 1142 } 1143 1144 /* 1145 * Reply with a PREP if we don't have a path to the root 1146 * or if the root sent us a proactive PREQ. 1147 */ 1148 if ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 || 1149 (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) { 1150 struct ieee80211_meshprep_ie prep; 1151 1152 prep.prep_flags = 0; 1153 prep.prep_hopcount = 0; 1154 prep.prep_ttl = ms->ms_ttl; 1155 IEEE80211_ADDR_COPY(prep.prep_origaddr, 1156 preq->preq_origaddr); 1157 prep.prep_origseq = preq->preq_origseq; 1158 prep.prep_lifetime = preq->preq_lifetime; 1159 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1160 IEEE80211_ADDR_COPY(prep.prep_targetaddr, 1161 vap->iv_myaddr); 1162 prep.prep_targetseq = ++hs->hs_seq; 1163 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep); 1164 } 1165 } 1166 1167 /* 1168 * Forwarding and Intermediate reply for PREQs with 1 target. 1169 */ 1170 if ((preq->preq_tcount == 1) && (preq->preq_ttl > 1) && 1171 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) { 1172 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */ 1173 1174 memcpy(&ppreq, preq, sizeof(ppreq)); 1175 1176 /* 1177 * We have a valid route to this node. 1178 * NB: if target is proxy dont reply. 1179 */ 1180 if (rttarg != NULL && 1181 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1182 !(rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)) { 1183 /* 1184 * Check if we can send an intermediate Path Reply, 1185 * i.e., Target Only bit is not set and target is not 1186 * the MAC broadcast address. 1187 */ 1188 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO) && 1189 !IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr)) { 1190 struct ieee80211_meshprep_ie prep; 1191 1192 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1193 "intermediate reply for PREQ from %6D", 1194 preq->preq_origaddr, ":"); 1195 prep.prep_flags = 0; 1196 prep.prep_hopcount = rttarg->rt_nhops; 1197 prep.prep_ttl = ms->ms_ttl; 1198 IEEE80211_ADDR_COPY(&prep.prep_targetaddr, 1199 PREQ_TADDR(0)); 1200 prep.prep_targetseq = hrtarg->hr_seq; 1201 prep.prep_lifetime = preq->preq_lifetime; 1202 prep.prep_metric =rttarg->rt_metric; 1203 IEEE80211_ADDR_COPY(&prep.prep_origaddr, 1204 preq->preq_origaddr); 1205 prep.prep_origseq = hrorig->hr_seq; 1206 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep); 1207 1208 /* 1209 * Set TO and unset RF bits because we have 1210 * sent a PREP. 1211 */ 1212 ppreq.preq_targets[0].target_flags |= 1213 IEEE80211_MESHPREQ_TFLAGS_TO; 1214 } 1215 } 1216 1217 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1218 "forward PREQ from %6D", 1219 preq->preq_origaddr, ":"); 1220 ppreq.preq_hopcount += 1; 1221 ppreq.preq_ttl -= 1; 1222 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni); 1223 1224 /* don't do PREQ ratecheck when we propagate */ 1225 hwmp_send_preq(vap, broadcastaddr, &ppreq, NULL, NULL); 1226 } 1227 } 1228 #undef PREQ_TFLAGS 1229 #undef PREQ_TADDR 1230 #undef PREQ_TSEQ 1231 1232 static int 1233 hwmp_send_preq(struct ieee80211vap *vap, 1234 const uint8_t da[IEEE80211_ADDR_LEN], 1235 struct ieee80211_meshpreq_ie *preq, 1236 struct timeval *last, struct timeval *minint) 1237 { 1238 1239 /* 1240 * Enforce PREQ interval. 1241 * NB: Proactive ROOT PREQs rate is handled by cb task. 1242 */ 1243 if (last != NULL && minint != NULL) { 1244 if (ratecheck(last, minint) == 0) 1245 return EALREADY; /* XXX: we should postpone */ 1246 getmicrouptime(last); 1247 } 1248 1249 /* 1250 * mesh preq action frame format 1251 * [6] da 1252 * [6] sa 1253 * [6] addr3 = sa 1254 * [1] action 1255 * [1] category 1256 * [tlv] mesh path request 1257 */ 1258 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ; 1259 preq->preq_len = (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE ? 1260 IEEE80211_MESHPREQ_BASE_SZ_AE : IEEE80211_MESHPREQ_BASE_SZ) + 1261 preq->preq_tcount * IEEE80211_MESHPREQ_TRGT_SZ; 1262 return hwmp_send_action(vap, da, (uint8_t *)preq, preq->preq_len+2); 1263 } 1264 1265 static void 1266 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni, 1267 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep) 1268 { 1269 #define IS_PROXY(rt) (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) 1270 #define PROXIED_BY_US(rt) \ 1271 (IEEE80211_ADDR_EQ(vap->iv_myaddr, rt->rt_mesh_gate)) 1272 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1273 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1274 struct ieee80211_mesh_route *rt = NULL; 1275 struct ieee80211_mesh_route *rtorig = NULL; 1276 struct ieee80211_mesh_route *rtext = NULL; 1277 struct ieee80211_hwmp_route *hr; 1278 struct ieee80211com *ic = vap->iv_ic; 1279 struct mbuf *m, *next; 1280 uint32_t metric = 0; 1281 const uint8_t *addr; 1282 1283 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1284 "received PREP, orig %6D, targ %6D", prep->prep_origaddr, ":", 1285 prep->prep_targetaddr, ":"); 1286 1287 /* 1288 * Acceptance criteria: (If the corresponding PREP was not generated 1289 * by us OR not generated by an external mac that is not proxied by us) 1290 * AND forwarding is disabled, discard this PREP. 1291 */ 1292 rtorig = ieee80211_mesh_rt_find(vap, prep->prep_origaddr); 1293 if ((!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) || 1294 (rtorig != NULL && IS_PROXY(rtorig) && !PROXIED_BY_US(rtorig))) && 1295 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)){ 1296 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1297 "discard PREP, orig(%6D) not proxied or generated by us", 1298 prep->prep_origaddr, ":"); 1299 return; 1300 } 1301 1302 /* PREP ACCEPTED */ 1303 1304 /* 1305 * If accepted shall create or update the active forwarding information 1306 * it maintains for the target mesh STA of the PREP (according to the 1307 * rules defined in 13.10.8.4). If the conditions for creating or 1308 * updating the forwarding information have not been met in those 1309 * rules, no further steps are applied to the PREP. 1310 */ 1311 rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr); 1312 if (rt == NULL) { 1313 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr); 1314 if (rt == NULL) { 1315 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1316 "unable to add PREP path to %6D", 1317 prep->prep_targetaddr, ":"); 1318 vap->iv_stats.is_mesh_rtaddfailed++; 1319 return; 1320 } 1321 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1322 "adding target %6D", prep->prep_targetaddr, ":"); 1323 } 1324 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1325 /* update path metric */ 1326 metric = prep->prep_metric + ms->ms_pmetric->mpm_metric(ni); 1327 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 1328 if (HWMP_SEQ_LT(prep->prep_targetseq, hr->hr_seq)) { 1329 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1330 "discard PREP from %6D, old seq no %u < %u", 1331 prep->prep_targetaddr, ":", 1332 prep->prep_targetseq, hr->hr_seq); 1333 return; 1334 } else if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq) && 1335 metric > rt->rt_metric) { 1336 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1337 "discard PREP from %6D, new metric %u > %u", 1338 prep->prep_targetaddr, ":", 1339 metric, rt->rt_metric); 1340 return; 1341 } 1342 } 1343 1344 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1345 "%s path to %6D, hopcount %d:%d metric %d:%d", 1346 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1347 "prefer" : "update", 1348 prep->prep_targetaddr, ":", 1349 rt->rt_nhops, prep->prep_hopcount + 1, 1350 rt->rt_metric, metric); 1351 1352 hr->hr_seq = prep->prep_targetseq; 1353 hr->hr_preqretries = 0; 1354 IEEE80211_ADDR_COPY(rt->rt_nexthop, ni->ni_macaddr); 1355 rt->rt_metric = metric; 1356 rt->rt_nhops = prep->prep_hopcount + 1; 1357 ieee80211_mesh_rt_update(rt, prep->prep_lifetime); 1358 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) { 1359 /* discovery complete */ 1360 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_DISCOVER; 1361 } 1362 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; /* mark valid */ 1363 1364 /* Update forwarding information to TA if metric improves */ 1365 hwmp_update_transmitter(vap, ni, "PREP"); 1366 1367 /* 1368 * If it's NOT for us, propagate the PREP 1369 */ 1370 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) && 1371 prep->prep_ttl > 1 && 1372 prep->prep_hopcount < hs->hs_maxhops) { 1373 struct ieee80211_meshprep_ie pprep; /* propagated PREP */ 1374 /* 1375 * NB: We should already have setup the path to orig 1376 * mesh STA when we propagated PREQ to target mesh STA, 1377 * no PREP is generated without a corresponding PREQ. 1378 * XXX: for now just ignore. 1379 */ 1380 if (rtorig == NULL) { 1381 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1382 "received PREP for an unknown orig(%6D)", 1383 prep->prep_origaddr, ":"); 1384 return; 1385 } 1386 1387 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1388 "propagate PREP from %6D", 1389 prep->prep_targetaddr, ":"); 1390 1391 memcpy(&pprep, prep, sizeof(pprep)); 1392 pprep.prep_hopcount += 1; 1393 pprep.prep_ttl -= 1; 1394 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni); 1395 hwmp_send_prep(vap, rtorig->rt_nexthop, &pprep); 1396 1397 /* precursor list for the Target Mesh STA Address is updated */ 1398 } 1399 1400 /* 1401 * Check if we received a PREP w/ AE and store target external address. 1402 * We may store target external address if recevied PREP w/ AE 1403 * and we are not final destination 1404 */ 1405 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 1406 rtext = ieee80211_mesh_rt_find(vap, 1407 prep->prep_target_ext_addr); 1408 if (rtext == NULL) { 1409 rtext = ieee80211_mesh_rt_add(vap, 1410 prep->prep_target_ext_addr); 1411 if (rtext == NULL) { 1412 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1413 "unable to add PREP path to proxy %6D", 1414 prep->prep_targetaddr, ":"); 1415 vap->iv_stats.is_mesh_rtaddfailed++; 1416 return; 1417 } 1418 } 1419 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1420 "%s path to %6D, hopcount %d:%d metric %d:%d", 1421 rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1422 "prefer" : "update", 1423 prep->prep_target_ext_addr, ":", 1424 rtext->rt_nhops, prep->prep_hopcount + 1, 1425 rtext->rt_metric, metric); 1426 1427 rtext->rt_flags = IEEE80211_MESHRT_FLAGS_PROXY | 1428 IEEE80211_MESHRT_FLAGS_VALID; 1429 IEEE80211_ADDR_COPY(rtext->rt_dest, 1430 prep->prep_target_ext_addr); 1431 IEEE80211_ADDR_COPY(rtext->rt_mesh_gate, 1432 prep->prep_targetaddr); 1433 IEEE80211_ADDR_COPY(rtext->rt_nexthop, wh->i_addr2); 1434 rtext->rt_metric = metric; 1435 rtext->rt_lifetime = prep->prep_lifetime; 1436 rtext->rt_nhops = prep->prep_hopcount + 1; 1437 rtext->rt_ext_seq = prep->prep_origseq; /* new proxy seq */ 1438 /* 1439 * XXX: proxy entries have no HWMP priv data, 1440 * nullify them to be sure? 1441 */ 1442 } 1443 /* 1444 * Check for frames queued awaiting path discovery. 1445 * XXX probably can tell exactly and avoid remove call 1446 * NB: hash may have false matches, if so they will get 1447 * stuck back on the stageq because there won't be 1448 * a path. 1449 */ 1450 addr = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ? 1451 prep->prep_target_ext_addr : prep->prep_targetaddr; 1452 m = ieee80211_ageq_remove(&ic->ic_stageq, 1453 (struct ieee80211_node *)(uintptr_t) 1454 ieee80211_mac_hash(ic, addr)); /* either dest or ext_dest */ 1455 1456 /* 1457 * All frames in the stageq here should be non-M_ENCAP; or things 1458 * will get very unhappy. 1459 */ 1460 for (; m != NULL; m = next) { 1461 next = m->m_nextpkt; 1462 m->m_nextpkt = NULL; 1463 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1464 "flush queued frame %p len %d", m, m->m_pkthdr.len); 1465 /* 1466 * If the mbuf has M_ENCAP set, ensure we free it. 1467 * Note that after if_transmit() is called, m is invalid. 1468 */ 1469 (void) ieee80211_vap_xmitpkt(vap, m); 1470 } 1471 #undef IS_PROXY 1472 #undef PROXIED_BY_US 1473 } 1474 1475 static int 1476 hwmp_send_prep(struct ieee80211vap *vap, 1477 const uint8_t da[IEEE80211_ADDR_LEN], 1478 struct ieee80211_meshprep_ie *prep) 1479 { 1480 /* NB: there's no PREP minimum interval. */ 1481 1482 /* 1483 * mesh prep action frame format 1484 * [6] da 1485 * [6] sa 1486 * [6] addr3 = sa 1487 * [1] action 1488 * [1] category 1489 * [tlv] mesh path reply 1490 */ 1491 prep->prep_ie = IEEE80211_ELEMID_MESHPREP; 1492 prep->prep_len = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ? 1493 IEEE80211_MESHPREP_BASE_SZ_AE : IEEE80211_MESHPREP_BASE_SZ; 1494 return hwmp_send_action(vap, da, (uint8_t *)prep, prep->prep_len + 2); 1495 } 1496 1497 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1498 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1499 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1500 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1501 static void 1502 hwmp_peerdown(struct ieee80211_node *ni) 1503 { 1504 struct ieee80211vap *vap = ni->ni_vap; 1505 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1506 struct ieee80211_meshperr_ie perr; 1507 struct ieee80211_mesh_route *rt; 1508 struct ieee80211_hwmp_route *hr; 1509 1510 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr); 1511 if (rt == NULL) 1512 return; 1513 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1514 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1515 "%s", "delete route entry"); 1516 perr.perr_ttl = ms->ms_ttl; 1517 perr.perr_ndests = 1; 1518 PERR_DFLAGS(0) = 0; 1519 if (hr->hr_seq == 0) 1520 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN; 1521 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC; 1522 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest); 1523 PERR_DSEQ(0) = ++hr->hr_seq; 1524 PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH; 1525 /* NB: flush everything passing through peer */ 1526 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr); 1527 hwmp_send_perr(vap, broadcastaddr, &perr); 1528 } 1529 #undef PERR_DFLAGS 1530 #undef PERR_DADDR 1531 #undef PERR_DSEQ 1532 #undef PERR_DRCODE 1533 1534 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags 1535 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr 1536 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 1537 #define PERR_DEXTADDR(n) perr->perr_dests[n].dest_ext_addr 1538 static void 1539 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni, 1540 const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr) 1541 { 1542 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1543 struct ieee80211_mesh_route *rt = NULL; 1544 struct ieee80211_mesh_route *rt_ext = NULL; 1545 struct ieee80211_hwmp_route *hr; 1546 struct ieee80211_meshperr_ie *pperr = NULL; 1547 int i, j = 0, forward = 0; 1548 1549 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1550 "received PERR from %6D", wh->i_addr2, ":"); 1551 1552 /* 1553 * if forwarding is true, prepare pperr 1554 */ 1555 if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) { 1556 forward = 1; 1557 pperr = IEEE80211_MALLOC(sizeof(*perr) + 31*sizeof(*perr->perr_dests), 1558 M_80211_MESH_PERR, IEEE80211_M_NOWAIT); /* XXX: magic number, 32 err dests */ 1559 } 1560 1561 /* 1562 * Acceptance criteria: check if we have forwarding information 1563 * stored about destination, and that nexthop == TA of this PERR. 1564 * NB: we also build a new PERR to propagate in case we should forward. 1565 */ 1566 for (i = 0; i < perr->perr_ndests; i++) { 1567 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i)); 1568 if (rt == NULL) 1569 continue; 1570 if (!IEEE80211_ADDR_EQ(rt->rt_nexthop, wh->i_addr2)) 1571 continue; 1572 1573 /* found and accepted a PERR ndest element, process it... */ 1574 if (forward) 1575 memcpy(&pperr->perr_dests[j], &perr->perr_dests[i], 1576 sizeof(*perr->perr_dests)); 1577 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1578 switch(PERR_DFLAGS(i)) { 1579 case (IEEE80211_REASON_MESH_PERR_NO_FI): 1580 if (PERR_DSEQ(i) == 0) { 1581 hr->hr_seq++; 1582 if (forward) { 1583 pperr->perr_dests[j].dest_seq = 1584 hr->hr_seq; 1585 } 1586 } else { 1587 hr->hr_seq = PERR_DSEQ(i); 1588 } 1589 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID; 1590 j++; 1591 break; 1592 case (IEEE80211_REASON_MESH_PERR_DEST_UNREACH): 1593 if(HWMP_SEQ_GT(PERR_DSEQ(i), hr->hr_seq)) { 1594 hr->hr_seq = PERR_DSEQ(i); 1595 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID; 1596 j++; 1597 } 1598 break; 1599 case (IEEE80211_REASON_MESH_PERR_NO_PROXY): 1600 rt_ext = ieee80211_mesh_rt_find(vap, PERR_DEXTADDR(i)); 1601 if (rt_ext != NULL) { 1602 rt_ext->rt_flags &= 1603 ~IEEE80211_MESHRT_FLAGS_VALID; 1604 j++; 1605 } 1606 break; 1607 default: 1608 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1609 "PERR, unknown reason code %u\n", PERR_DFLAGS(i)); 1610 goto done; /* XXX: stats?? */ 1611 } 1612 ieee80211_mesh_rt_flush_peer(vap, PERR_DADDR(i)); 1613 KASSERT(j < 32, ("PERR, error ndest >= 32 (%u)", j)); 1614 } 1615 if (j == 0) { 1616 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, "%s", 1617 "PERR not accepted"); 1618 goto done; /* XXX: stats?? */ 1619 } 1620 1621 /* 1622 * Propagate the PERR if we previously found it on our routing table. 1623 */ 1624 if (forward && perr->perr_ttl > 1) { 1625 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1626 "propagate PERR from %6D", wh->i_addr2, ":"); 1627 pperr->perr_ndests = j; 1628 pperr->perr_ttl--; 1629 hwmp_send_perr(vap, broadcastaddr, pperr); 1630 } 1631 done: 1632 if (pperr != NULL) 1633 IEEE80211_FREE(pperr, M_80211_MESH_PERR); 1634 } 1635 #undef PERR_DFLAGS 1636 #undef PERR_DADDR 1637 #undef PERR_DSEQ 1638 #undef PERR_DEXTADDR 1639 1640 static int 1641 hwmp_send_perr(struct ieee80211vap *vap, 1642 const uint8_t da[IEEE80211_ADDR_LEN], 1643 struct ieee80211_meshperr_ie *perr) 1644 { 1645 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1646 int i; 1647 uint8_t length = 0; 1648 1649 /* 1650 * Enforce PERR interval. 1651 */ 1652 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0) 1653 return EALREADY; 1654 getmicrouptime(&hs->hs_lastperr); 1655 1656 /* 1657 * mesh perr action frame format 1658 * [6] da 1659 * [6] sa 1660 * [6] addr3 = sa 1661 * [1] action 1662 * [1] category 1663 * [tlv] mesh path error 1664 */ 1665 perr->perr_ie = IEEE80211_ELEMID_MESHPERR; 1666 length = IEEE80211_MESHPERR_BASE_SZ; 1667 for (i = 0; i<perr->perr_ndests; i++) { 1668 if (perr->perr_dests[i].dest_flags & 1669 IEEE80211_MESHPERR_FLAGS_AE) { 1670 length += IEEE80211_MESHPERR_DEST_SZ_AE; 1671 continue ; 1672 } 1673 length += IEEE80211_MESHPERR_DEST_SZ; 1674 } 1675 perr->perr_len =length; 1676 return hwmp_send_action(vap, da, (uint8_t *)perr, perr->perr_len+2); 1677 } 1678 1679 /* 1680 * Called from the rest of the net80211 code (mesh code for example). 1681 * NB: IEEE80211_REASON_MESH_PERR_DEST_UNREACH can be trigger by the fact that 1682 * a mesh STA is unable to forward an MSDU/MMPDU to a next-hop mesh STA. 1683 */ 1684 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1685 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1686 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1687 #define PERR_DEXTADDR(n) perr.perr_dests[n].dest_ext_addr 1688 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1689 static void 1690 hwmp_senderror(struct ieee80211vap *vap, 1691 const uint8_t addr[IEEE80211_ADDR_LEN], 1692 struct ieee80211_mesh_route *rt, int rcode) 1693 { 1694 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1695 struct ieee80211_hwmp_route *hr = NULL; 1696 struct ieee80211_meshperr_ie perr; 1697 1698 if (rt != NULL) 1699 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1700 struct ieee80211_hwmp_route); 1701 1702 perr.perr_ndests = 1; 1703 perr.perr_ttl = ms->ms_ttl; 1704 PERR_DFLAGS(0) = 0; 1705 PERR_DRCODE(0) = rcode; 1706 1707 switch (rcode) { 1708 case IEEE80211_REASON_MESH_PERR_NO_FI: 1709 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr); 1710 PERR_DSEQ(0) = 0; /* reserved */ 1711 break; 1712 case IEEE80211_REASON_MESH_PERR_NO_PROXY: 1713 KASSERT(rt != NULL, ("no proxy info for sending PERR")); 1714 KASSERT(rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY, 1715 ("route is not marked proxy")); 1716 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_FLAGS_AE; 1717 IEEE80211_ADDR_COPY(PERR_DADDR(0), vap->iv_myaddr); 1718 PERR_DSEQ(0) = rt->rt_ext_seq; 1719 IEEE80211_ADDR_COPY(PERR_DEXTADDR(0), addr); 1720 break; 1721 case IEEE80211_REASON_MESH_PERR_DEST_UNREACH: 1722 KASSERT(rt != NULL, ("no route info for sending PERR")); 1723 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr); 1724 PERR_DSEQ(0) = hr->hr_seq; 1725 break; 1726 default: 1727 KASSERT(0, ("unknown reason code for HWMP PERR (%u)", rcode)); 1728 } 1729 hwmp_send_perr(vap, broadcastaddr, &perr); 1730 } 1731 #undef PERR_DFLAGS 1732 #undef PEER_DADDR 1733 #undef PERR_DSEQ 1734 #undef PERR_DEXTADDR 1735 #undef PERR_DRCODE 1736 1737 static void 1738 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni, 1739 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann) 1740 { 1741 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1742 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1743 struct ieee80211_mesh_route *rt = NULL; 1744 struct ieee80211_hwmp_route *hr; 1745 struct ieee80211_meshpreq_ie preq; 1746 struct ieee80211_meshrann_ie prann; 1747 1748 if (IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr)) 1749 return; 1750 1751 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr); 1752 if (rt != NULL && rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) { 1753 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1754 1755 /* Acceptance criteria: if RANN.seq < stored seq, discard RANN */ 1756 if (HWMP_SEQ_LT(rann->rann_seq, hr->hr_seq)) { 1757 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1758 "RANN seq %u < %u", rann->rann_seq, hr->hr_seq); 1759 return; 1760 } 1761 1762 /* Acceptance criteria: if RANN.seq == stored seq AND 1763 * RANN.metric > stored metric, discard RANN */ 1764 if (HWMP_SEQ_EQ(rann->rann_seq, hr->hr_seq) && 1765 rann->rann_metric > rt->rt_metric) { 1766 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1767 "RANN metric %u > %u", rann->rann_metric, rt->rt_metric); 1768 return; 1769 } 1770 } 1771 1772 /* RANN ACCEPTED */ 1773 1774 ieee80211_hwmp_rannint = rann->rann_interval; /* XXX: mtx lock? */ 1775 1776 if (rt == NULL) { 1777 rt = ieee80211_mesh_rt_add(vap, rann->rann_addr); 1778 if (rt == NULL) { 1779 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1780 "unable to add mac for RANN root %6D", 1781 rann->rann_addr, ":"); 1782 vap->iv_stats.is_mesh_rtaddfailed++; 1783 return; 1784 } 1785 } 1786 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1787 /* Check if root is a mesh gate, mark it */ 1788 if (rann->rann_flags & IEEE80211_MESHRANN_FLAGS_GATE) { 1789 struct ieee80211_mesh_gate_route *gr; 1790 1791 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE; 1792 gr = ieee80211_mesh_mark_gate(vap, rann->rann_addr, 1793 rt); 1794 gr->gr_lastseq = 0; /* NOT GANN */ 1795 } 1796 /* discovery timeout */ 1797 ieee80211_mesh_rt_update(rt, 1798 ticks_to_msecs(ieee80211_hwmp_roottimeout)); 1799 1800 preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM; 1801 preq.preq_hopcount = 0; 1802 preq.preq_ttl = ms->ms_ttl; 1803 preq.preq_id = 0; /* reserved */ 1804 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1805 preq.preq_origseq = ++hs->hs_seq; 1806 preq.preq_lifetime = ieee80211_hwmp_roottimeout; 1807 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1808 preq.preq_tcount = 1; 1809 preq.preq_targets[0].target_flags = IEEE80211_MESHPREQ_TFLAGS_TO; 1810 /* NB: IEEE80211_MESHPREQ_TFLAGS_USN = 0 implicitly implied */ 1811 IEEE80211_ADDR_COPY(preq.preq_targets[0].target_addr, rann->rann_addr); 1812 preq.preq_targets[0].target_seq = rann->rann_seq; 1813 /* XXX: if rootconfint have not passed, we built this preq in vain */ 1814 hwmp_send_preq(vap, wh->i_addr2, &preq, &hr->hr_lastrootconf, 1815 &ieee80211_hwmp_rootconfint); 1816 1817 /* propagate a RANN */ 1818 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1819 rann->rann_ttl > 1 && 1820 ms->ms_flags & IEEE80211_MESHFLAGS_FWD) { 1821 hr->hr_seq = rann->rann_seq; 1822 memcpy(&prann, rann, sizeof(prann)); 1823 prann.rann_hopcount += 1; 1824 prann.rann_ttl -= 1; 1825 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni); 1826 hwmp_send_rann(vap, broadcastaddr, &prann); 1827 } 1828 } 1829 1830 static int 1831 hwmp_send_rann(struct ieee80211vap *vap, 1832 const uint8_t da[IEEE80211_ADDR_LEN], 1833 struct ieee80211_meshrann_ie *rann) 1834 { 1835 /* 1836 * mesh rann action frame format 1837 * [6] da 1838 * [6] sa 1839 * [6] addr3 = sa 1840 * [1] action 1841 * [1] category 1842 * [tlv] root announcement 1843 */ 1844 rann->rann_ie = IEEE80211_ELEMID_MESHRANN; 1845 rann->rann_len = IEEE80211_MESHRANN_BASE_SZ; 1846 return hwmp_send_action(vap, da, (uint8_t *)rann, rann->rann_len + 2); 1847 } 1848 1849 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 1850 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr 1851 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 1852 static void 1853 hwmp_rediscover_cb(void *arg) 1854 { 1855 struct ieee80211_mesh_route *rt = arg; 1856 struct ieee80211vap *vap = rt->rt_vap; 1857 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1858 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1859 struct ieee80211_hwmp_route *hr; 1860 struct ieee80211_meshpreq_ie preq; /* Optimize: storing first preq? */ 1861 1862 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) 1863 return ; /* nothing to do */ 1864 1865 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1866 if (hr->hr_preqretries >= 1867 ieee80211_hwmp_maxpreq_retries) { 1868 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, 1869 rt->rt_dest, "%s", 1870 "max number of discovery, send queued frames to GATE"); 1871 ieee80211_mesh_forward_to_gates(vap, rt); 1872 vap->iv_stats.is_mesh_fwd_nopath++; 1873 return ; /* XXX: flush queue? */ 1874 } 1875 1876 hr->hr_preqretries++; 1877 1878 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, rt->rt_dest, 1879 "start path rediscovery , target seq %u", hr->hr_seq); 1880 /* 1881 * Try to discover the path for this node. 1882 * Group addressed PREQ Case A 1883 */ 1884 preq.preq_flags = 0; 1885 preq.preq_hopcount = 0; 1886 preq.preq_ttl = ms->ms_ttl; 1887 preq.preq_id = ++hs->hs_preqid; 1888 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1889 preq.preq_origseq = hr->hr_origseq; 1890 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_pathtimeout); 1891 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1892 preq.preq_tcount = 1; 1893 IEEE80211_ADDR_COPY(PREQ_TADDR(0), rt->rt_dest); 1894 PREQ_TFLAGS(0) = 0; 1895 if (ieee80211_hwmp_targetonly) 1896 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 1897 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 1898 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */ 1899 /* XXX check return value */ 1900 hwmp_send_preq(vap, broadcastaddr, &preq, &hr->hr_lastpreq, 1901 &ieee80211_hwmp_preqminint); 1902 callout_reset(&rt->rt_discovery, 1903 ieee80211_hwmp_net_diameter_traversaltime * 2, 1904 hwmp_rediscover_cb, rt); 1905 } 1906 1907 static struct ieee80211_node * 1908 hwmp_discover(struct ieee80211vap *vap, 1909 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m) 1910 { 1911 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1912 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1913 struct ieee80211_mesh_route *rt = NULL; 1914 struct ieee80211_hwmp_route *hr; 1915 struct ieee80211_meshpreq_ie preq; 1916 struct ieee80211_node *ni; 1917 int sendpreq = 0; 1918 1919 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1920 ("not a mesh vap, opmode %d", vap->iv_opmode)); 1921 1922 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest), 1923 ("%s: discovering self!", __func__)); 1924 1925 ni = NULL; 1926 if (!IEEE80211_IS_MULTICAST(dest)) { 1927 rt = ieee80211_mesh_rt_find(vap, dest); 1928 if (rt == NULL) { 1929 rt = ieee80211_mesh_rt_add(vap, dest); 1930 if (rt == NULL) { 1931 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 1932 ni, "unable to add discovery path to %6D", 1933 dest, ":"); 1934 vap->iv_stats.is_mesh_rtaddfailed++; 1935 goto done; 1936 } 1937 } 1938 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1939 struct ieee80211_hwmp_route); 1940 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) { 1941 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1942 "%s", "already discovering queue frame until path found"); 1943 sendpreq = 1; 1944 goto done; 1945 } 1946 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) { 1947 if (hr->hr_lastdiscovery != 0 && 1948 (ticks - hr->hr_lastdiscovery < 1949 (ieee80211_hwmp_net_diameter_traversaltime * 2))) { 1950 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 1951 dest, NULL, "%s", 1952 "too frequent discovery requeust"); 1953 sendpreq = 1; 1954 goto done; 1955 } 1956 hr->hr_lastdiscovery = ticks; 1957 if (hr->hr_preqretries >= 1958 ieee80211_hwmp_maxpreq_retries) { 1959 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 1960 dest, NULL, "%s", 1961 "no valid path , max number of discovery"); 1962 vap->iv_stats.is_mesh_fwd_nopath++; 1963 goto done; 1964 } 1965 rt->rt_flags = IEEE80211_MESHRT_FLAGS_DISCOVER; 1966 hr->hr_preqretries++; 1967 if (hr->hr_origseq == 0) 1968 hr->hr_origseq = ++hs->hs_seq; 1969 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1970 sendpreq = 1; 1971 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1972 "start path discovery (src %s), target seq %u", 1973 m == NULL ? "<none>" : ether_sprintf( 1974 mtod(m, struct ether_header *)->ether_shost), 1975 hr->hr_seq); 1976 /* 1977 * Try to discover the path for this node. 1978 * Group addressed PREQ Case A 1979 */ 1980 preq.preq_flags = 0; 1981 preq.preq_hopcount = 0; 1982 preq.preq_ttl = ms->ms_ttl; 1983 preq.preq_id = ++hs->hs_preqid; 1984 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1985 preq.preq_origseq = hr->hr_origseq; 1986 preq.preq_lifetime = 1987 ticks_to_msecs(ieee80211_hwmp_pathtimeout); 1988 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1989 preq.preq_tcount = 1; 1990 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest); 1991 PREQ_TFLAGS(0) = 0; 1992 if (ieee80211_hwmp_targetonly) 1993 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 1994 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 1995 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */ 1996 /* XXX check return value */ 1997 hwmp_send_preq(vap, broadcastaddr, &preq, 1998 &hr->hr_lastpreq, &ieee80211_hwmp_preqminint); 1999 callout_reset(&rt->rt_discovery, 2000 ieee80211_hwmp_net_diameter_traversaltime * 2, 2001 hwmp_rediscover_cb, rt); 2002 } 2003 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) 2004 ni = ieee80211_find_txnode(vap, rt->rt_nexthop); 2005 } else { 2006 ni = ieee80211_find_txnode(vap, dest); 2007 /* NB: if null then we leak mbuf */ 2008 KASSERT(ni != NULL, ("leak mcast frame")); 2009 return ni; 2010 } 2011 done: 2012 if (ni == NULL && m != NULL) { 2013 if (sendpreq) { 2014 struct ieee80211com *ic = vap->iv_ic; 2015 /* 2016 * Queue packet for transmit when path discovery 2017 * completes. If discovery never completes the 2018 * frame will be flushed by way of the aging timer. 2019 */ 2020 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 2021 "%s", "queue frame until path found"); 2022 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 2023 m->m_pkthdr.rcvif = (void *)(uintptr_t) 2024 ieee80211_mac_hash(ic, dest); 2025 /* XXX age chosen randomly */ 2026 ieee80211_ageq_append(&ic->ic_stageq, m, 2027 IEEE80211_INACT_WAIT); 2028 } else { 2029 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 2030 dest, NULL, "%s", "no valid path to this node"); 2031 m_freem(m); 2032 } 2033 } 2034 return ni; 2035 } 2036 #undef PREQ_TFLAGS 2037 #undef PREQ_TADDR 2038 #undef PREQ_TSEQ 2039 2040 static int 2041 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 2042 { 2043 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 2044 int error; 2045 2046 if (vap->iv_opmode != IEEE80211_M_MBSS) 2047 return ENOSYS; 2048 error = 0; 2049 switch (ireq->i_type) { 2050 case IEEE80211_IOC_HWMP_ROOTMODE: 2051 ireq->i_val = hs->hs_rootmode; 2052 break; 2053 case IEEE80211_IOC_HWMP_MAXHOPS: 2054 ireq->i_val = hs->hs_maxhops; 2055 break; 2056 default: 2057 return ENOSYS; 2058 } 2059 return error; 2060 } 2061 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211); 2062 2063 static int 2064 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 2065 { 2066 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 2067 int error; 2068 2069 if (vap->iv_opmode != IEEE80211_M_MBSS) 2070 return ENOSYS; 2071 error = 0; 2072 switch (ireq->i_type) { 2073 case IEEE80211_IOC_HWMP_ROOTMODE: 2074 if (ireq->i_val < 0 || ireq->i_val > 3) 2075 return EINVAL; 2076 hs->hs_rootmode = ireq->i_val; 2077 hwmp_rootmode_setup(vap); 2078 break; 2079 case IEEE80211_IOC_HWMP_MAXHOPS: 2080 if (ireq->i_val <= 0 || ireq->i_val > 255) 2081 return EINVAL; 2082 hs->hs_maxhops = ireq->i_val; 2083 break; 2084 default: 2085 return ENOSYS; 2086 } 2087 return error; 2088 } 2089 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211);
Cache object: e31d69b85b55d06983a4e128d4b10051
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