1 /*- 2 * Copyright (c) 2009 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Rui Paulo under sponsorship from the 6 * FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 #include <sys/cdefs.h> 30 #ifdef __FreeBSD__ 31 __FBSDID("$FreeBSD$"); 32 #endif 33 34 /* 35 * IEEE 802.11s Hybrid Wireless Mesh Protocol, HWMP. 36 * 37 * Based on March 2009, D3.0 802.11s draft spec. 38 */ 39 #include "opt_inet.h" 40 #include "opt_wlan.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/mbuf.h> 45 #include <sys/malloc.h> 46 #include <sys/kernel.h> 47 48 #include <sys/socket.h> 49 #include <sys/sockio.h> 50 #include <sys/endian.h> 51 #include <sys/errno.h> 52 #include <sys/proc.h> 53 #include <sys/sysctl.h> 54 55 #include <net/if.h> 56 #include <net/if_media.h> 57 #include <net/if_llc.h> 58 #include <net/ethernet.h> 59 60 #include <net/bpf.h> 61 62 #include <net80211/ieee80211_var.h> 63 #include <net80211/ieee80211_action.h> 64 #include <net80211/ieee80211_input.h> 65 #include <net80211/ieee80211_mesh.h> 66 67 static void hwmp_vattach(struct ieee80211vap *); 68 static void hwmp_vdetach(struct ieee80211vap *); 69 static int hwmp_newstate(struct ieee80211vap *, 70 enum ieee80211_state, int); 71 static int hwmp_send_action(struct ieee80211vap *, 72 const uint8_t [IEEE80211_ADDR_LEN], 73 uint8_t *, size_t); 74 static uint8_t * hwmp_add_meshpreq(uint8_t *, 75 const struct ieee80211_meshpreq_ie *); 76 static uint8_t * hwmp_add_meshprep(uint8_t *, 77 const struct ieee80211_meshprep_ie *); 78 static uint8_t * hwmp_add_meshperr(uint8_t *, 79 const struct ieee80211_meshperr_ie *); 80 static uint8_t * hwmp_add_meshrann(uint8_t *, 81 const struct ieee80211_meshrann_ie *); 82 static void hwmp_rootmode_setup(struct ieee80211vap *); 83 static void hwmp_rootmode_cb(void *); 84 static void hwmp_rootmode_rann_cb(void *); 85 static void hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *, 86 const struct ieee80211_frame *, 87 const struct ieee80211_meshpreq_ie *); 88 static int hwmp_send_preq(struct ieee80211vap *, 89 const uint8_t [IEEE80211_ADDR_LEN], 90 struct ieee80211_meshpreq_ie *, 91 struct timeval *, struct timeval *); 92 static void hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *, 93 const struct ieee80211_frame *, 94 const struct ieee80211_meshprep_ie *); 95 static int hwmp_send_prep(struct ieee80211vap *, 96 const uint8_t [IEEE80211_ADDR_LEN], 97 struct ieee80211_meshprep_ie *); 98 static void hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *, 99 const struct ieee80211_frame *, 100 const struct ieee80211_meshperr_ie *); 101 static int hwmp_send_perr(struct ieee80211vap *, 102 const uint8_t [IEEE80211_ADDR_LEN], 103 struct ieee80211_meshperr_ie *); 104 static void hwmp_senderror(struct ieee80211vap *, 105 const uint8_t [IEEE80211_ADDR_LEN], 106 struct ieee80211_mesh_route *, int); 107 static void hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *, 108 const struct ieee80211_frame *, 109 const struct ieee80211_meshrann_ie *); 110 static int hwmp_send_rann(struct ieee80211vap *, 111 const uint8_t [IEEE80211_ADDR_LEN], 112 struct ieee80211_meshrann_ie *); 113 static struct ieee80211_node * 114 hwmp_discover(struct ieee80211vap *, 115 const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *); 116 static void hwmp_peerdown(struct ieee80211_node *); 117 118 static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 }; 119 static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 }; 120 121 /* unalligned little endian access */ 122 #define LE_WRITE_2(p, v) do { \ 123 ((uint8_t *)(p))[0] = (v) & 0xff; \ 124 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 125 } while (0) 126 #define LE_WRITE_4(p, v) do { \ 127 ((uint8_t *)(p))[0] = (v) & 0xff; \ 128 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 129 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ 130 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ 131 } while (0) 132 133 134 /* NB: the Target Address set in a Proactive PREQ is the broadcast address. */ 135 static const uint8_t broadcastaddr[IEEE80211_ADDR_LEN] = 136 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 137 138 typedef uint32_t ieee80211_hwmp_seq; 139 #define HWMP_SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0) 140 #define HWMP_SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0) 141 #define HWMP_SEQ_EQ(a, b) ((int32_t)((a)-(b)) == 0) 142 #define HWMP_SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0) 143 #define HWMP_SEQ_GEQ(a, b) ((int32_t)((a)-(b)) >= 0) 144 145 #define HWMP_SEQ_MAX(a, b) (a > b ? a : b) 146 147 /* 148 * Private extension of ieee80211_mesh_route. 149 */ 150 struct ieee80211_hwmp_route { 151 ieee80211_hwmp_seq hr_seq; /* last HWMP seq seen from dst*/ 152 ieee80211_hwmp_seq hr_preqid; /* last PREQ ID seen from dst */ 153 ieee80211_hwmp_seq hr_origseq; /* seq. no. on our latest PREQ*/ 154 struct timeval hr_lastpreq; /* last time we sent a PREQ */ 155 struct timeval hr_lastrootconf; /* last sent PREQ root conf */ 156 int hr_preqretries; /* number of discoveries */ 157 int hr_lastdiscovery; /* last discovery in ticks */ 158 }; 159 struct ieee80211_hwmp_state { 160 ieee80211_hwmp_seq hs_seq; /* next seq to be used */ 161 ieee80211_hwmp_seq hs_preqid; /* next PREQ ID to be used */ 162 int hs_rootmode; /* proactive HWMP */ 163 struct timeval hs_lastperr; /* last time we sent a PERR */ 164 struct callout hs_roottimer; 165 uint8_t hs_maxhops; /* max hop count */ 166 }; 167 168 static SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0, 169 "IEEE 802.11s HWMP parameters"); 170 static int ieee80211_hwmp_targetonly = 0; 171 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLTYPE_INT | CTLFLAG_RW, 172 &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs"); 173 static int ieee80211_hwmp_pathtimeout = -1; 174 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, CTLTYPE_INT | CTLFLAG_RW, 175 &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I", 176 "path entry lifetime (ms)"); 177 static int ieee80211_hwmp_maxpreq_retries = -1; 178 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, maxpreq_retries, CTLTYPE_INT | CTLFLAG_RW, 179 &ieee80211_hwmp_maxpreq_retries, 0, ieee80211_sysctl_msecs_ticks, "I", 180 "maximum number of preq retries"); 181 static int ieee80211_hwmp_net_diameter_traversaltime = -1; 182 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, net_diameter_traversal_time, 183 CTLTYPE_INT | CTLFLAG_RW, &ieee80211_hwmp_net_diameter_traversaltime, 0, 184 ieee80211_sysctl_msecs_ticks, "I", 185 "estimate travelse time across the MBSS (ms)"); 186 static int ieee80211_hwmp_roottimeout = -1; 187 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, CTLTYPE_INT | CTLFLAG_RW, 188 &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I", 189 "root PREQ timeout (ms)"); 190 static int ieee80211_hwmp_rootint = -1; 191 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, CTLTYPE_INT | CTLFLAG_RW, 192 &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I", 193 "root interval (ms)"); 194 static int ieee80211_hwmp_rannint = -1; 195 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, CTLTYPE_INT | CTLFLAG_RW, 196 &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I", 197 "root announcement interval (ms)"); 198 static struct timeval ieee80211_hwmp_rootconfint = { 0, 0 }; 199 static int ieee80211_hwmp_rootconfint_internal = -1; 200 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootconfint, CTLTYPE_INT | CTLFLAG_RD, 201 &ieee80211_hwmp_rootconfint_internal, 0, ieee80211_sysctl_msecs_ticks, "I", 202 "root confirmation interval (ms) (read-only)"); 203 204 #define IEEE80211_HWMP_DEFAULT_MAXHOPS 31 205 206 static ieee80211_recv_action_func hwmp_recv_action_meshpath; 207 208 static struct ieee80211_mesh_proto_path mesh_proto_hwmp = { 209 .mpp_descr = "HWMP", 210 .mpp_ie = IEEE80211_MESHCONF_PATH_HWMP, 211 .mpp_discover = hwmp_discover, 212 .mpp_peerdown = hwmp_peerdown, 213 .mpp_senderror = hwmp_senderror, 214 .mpp_vattach = hwmp_vattach, 215 .mpp_vdetach = hwmp_vdetach, 216 .mpp_newstate = hwmp_newstate, 217 .mpp_privlen = sizeof(struct ieee80211_hwmp_route), 218 }; 219 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact, CTLTYPE_INT | CTLFLAG_RW, 220 &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I", 221 "mesh route inactivity timeout (ms)"); 222 223 224 static void 225 ieee80211_hwmp_init(void) 226 { 227 /* Default values as per amendment */ 228 ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000); 229 ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000); 230 ieee80211_hwmp_rootint = msecs_to_ticks(2*1000); 231 ieee80211_hwmp_rannint = msecs_to_ticks(1*1000); 232 ieee80211_hwmp_rootconfint_internal = msecs_to_ticks(2*1000); 233 ieee80211_hwmp_maxpreq_retries = 3; 234 /* 235 * (TU): A measurement of time equal to 1024 μs, 236 * 500 TU is 512 ms. 237 */ 238 ieee80211_hwmp_net_diameter_traversaltime = msecs_to_ticks(512); 239 240 /* 241 * NB: I dont know how to make SYSCTL_PROC that calls ms to ticks 242 * and return a struct timeval... 243 */ 244 ieee80211_hwmp_rootconfint.tv_usec = 245 ieee80211_hwmp_rootconfint_internal * 1000; 246 247 /* 248 * Register action frame handler. 249 */ 250 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESH, 251 IEEE80211_ACTION_MESH_HWMP, hwmp_recv_action_meshpath); 252 253 /* NB: default is 5 secs per spec */ 254 mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000); 255 256 /* 257 * Register HWMP. 258 */ 259 ieee80211_mesh_register_proto_path(&mesh_proto_hwmp); 260 } 261 SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL); 262 263 void 264 hwmp_vattach(struct ieee80211vap *vap) 265 { 266 struct ieee80211_hwmp_state *hs; 267 268 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 269 ("not a mesh vap, opmode %d", vap->iv_opmode)); 270 271 hs = malloc(sizeof(struct ieee80211_hwmp_state), M_80211_VAP, 272 M_NOWAIT | M_ZERO); 273 if (hs == NULL) { 274 printf("%s: couldn't alloc HWMP state\n", __func__); 275 return; 276 } 277 hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS; 278 callout_init(&hs->hs_roottimer, CALLOUT_MPSAFE); 279 vap->iv_hwmp = hs; 280 } 281 282 void 283 hwmp_vdetach(struct ieee80211vap *vap) 284 { 285 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 286 287 callout_drain(&hs->hs_roottimer); 288 free(vap->iv_hwmp, M_80211_VAP); 289 vap->iv_hwmp = NULL; 290 } 291 292 int 293 hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg) 294 { 295 enum ieee80211_state nstate = vap->iv_state; 296 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 297 298 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 299 __func__, ieee80211_state_name[ostate], 300 ieee80211_state_name[nstate], arg); 301 302 if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN) 303 callout_drain(&hs->hs_roottimer); 304 if (nstate == IEEE80211_S_RUN) 305 hwmp_rootmode_setup(vap); 306 return 0; 307 } 308 309 /* 310 * Verify the length of an HWMP PREQ and return the number 311 * of destinations >= 1, if verification fails -1 is returned. 312 */ 313 static int 314 verify_mesh_preq_len(struct ieee80211vap *vap, 315 const struct ieee80211_frame *wh, const uint8_t *iefrm) 316 { 317 int alloc_sz = -1; 318 int ndest = -1; 319 if (iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE) { 320 /* Originator External Address present */ 321 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ_AE; 322 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET_AE]; 323 } else { 324 /* w/o Originator External Address */ 325 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ; 326 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET]; 327 } 328 alloc_sz += ndest * IEEE80211_MESHPREQ_TRGT_SZ; 329 330 if(iefrm[1] != (alloc_sz)) { 331 IEEE80211_DISCARD(vap, 332 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 333 wh, NULL, "PREQ (AE=%s) with wrong len", 334 iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE ? "1" : "0"); 335 return (-1); 336 } 337 return ndest; 338 } 339 340 /* 341 * Verify the length of an HWMP PREP and returns 1 on success, 342 * otherwise -1. 343 */ 344 static int 345 verify_mesh_prep_len(struct ieee80211vap *vap, 346 const struct ieee80211_frame *wh, const uint8_t *iefrm) 347 { 348 int alloc_sz = -1; 349 if (iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE) { 350 if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ_AE) 351 alloc_sz = IEEE80211_MESHPREP_BASE_SZ_AE; 352 } else if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ) 353 alloc_sz = IEEE80211_MESHPREP_BASE_SZ; 354 if(alloc_sz < 0) { 355 IEEE80211_DISCARD(vap, 356 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 357 wh, NULL, "PREP (AE=%s) with wrong len", 358 iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE ? "1" : "0"); 359 return (-1); 360 } 361 return (1); 362 } 363 364 /* 365 * Verify the length of an HWMP PERR and return the number 366 * of destinations >= 1, if verification fails -1 is returned. 367 */ 368 static int 369 verify_mesh_perr_len(struct ieee80211vap *vap, 370 const struct ieee80211_frame *wh, const uint8_t *iefrm) 371 { 372 int alloc_sz = -1; 373 const uint8_t *iefrm_t = iefrm; 374 uint8_t ndest = iefrm_t[IEEE80211_MESHPERR_NDEST_OFFSET]; 375 int i; 376 377 if(ndest > IEEE80211_MESHPERR_MAXDEST) { 378 IEEE80211_DISCARD(vap, 379 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 380 wh, NULL, "PERR with wrong number of destionat (>19), %u", 381 ndest); 382 return (-1); 383 } 384 385 iefrm_t += IEEE80211_MESHPERR_NDEST_OFFSET + 1; /* flag is next field */ 386 /* We need to check each destionation flag to know size */ 387 for(i = 0; i<ndest; i++) { 388 if ((*iefrm_t) & IEEE80211_MESHPERR_FLAGS_AE) 389 iefrm_t += IEEE80211_MESHPERR_DEST_SZ_AE; 390 else 391 iefrm_t += IEEE80211_MESHPERR_DEST_SZ; 392 } 393 394 alloc_sz = (iefrm_t - iefrm) - 2; /* action + code */ 395 if(alloc_sz != iefrm[1]) { 396 IEEE80211_DISCARD(vap, 397 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 398 wh, NULL, "%s", "PERR with wrong len"); 399 return (-1); 400 } 401 return ndest; 402 } 403 404 static int 405 hwmp_recv_action_meshpath(struct ieee80211_node *ni, 406 const struct ieee80211_frame *wh, 407 const uint8_t *frm, const uint8_t *efrm) 408 { 409 struct ieee80211vap *vap = ni->ni_vap; 410 struct ieee80211_meshpreq_ie *preq; 411 struct ieee80211_meshprep_ie *prep; 412 struct ieee80211_meshperr_ie *perr; 413 struct ieee80211_meshrann_ie rann; 414 const uint8_t *iefrm = frm + 2; /* action + code */ 415 const uint8_t *iefrm_t = iefrm; /* temporary pointer */ 416 int ndest = -1; 417 int found = 0; 418 419 while (efrm - iefrm > 1) { 420 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0); 421 switch (*iefrm) { 422 case IEEE80211_ELEMID_MESHPREQ: 423 { 424 int i = 0; 425 426 iefrm_t = iefrm; 427 ndest = verify_mesh_preq_len(vap, wh, iefrm_t); 428 if (ndest < 0) { 429 vap->iv_stats.is_rx_mgtdiscard++; 430 break; 431 } 432 preq = malloc(sizeof(*preq) + 433 (ndest - 1) * sizeof(*preq->preq_targets), 434 M_80211_MESH_PREQ, M_NOWAIT | M_ZERO); 435 KASSERT(preq != NULL, ("preq == NULL")); 436 437 preq->preq_ie = *iefrm_t++; 438 preq->preq_len = *iefrm_t++; 439 preq->preq_flags = *iefrm_t++; 440 preq->preq_hopcount = *iefrm_t++; 441 preq->preq_ttl = *iefrm_t++; 442 preq->preq_id = LE_READ_4(iefrm_t); iefrm_t += 4; 443 IEEE80211_ADDR_COPY(preq->preq_origaddr, iefrm_t); 444 iefrm_t += 6; 445 preq->preq_origseq = LE_READ_4(iefrm_t); iefrm_t += 4; 446 /* NB: may have Originator Proxied Address */ 447 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 448 IEEE80211_ADDR_COPY( 449 preq->preq_orig_ext_addr, iefrm_t); 450 iefrm_t += 6; 451 } 452 preq->preq_lifetime = LE_READ_4(iefrm_t); iefrm_t += 4; 453 preq->preq_metric = LE_READ_4(iefrm_t); iefrm_t += 4; 454 preq->preq_tcount = *iefrm_t++; 455 456 for (i = 0; i < preq->preq_tcount; i++) { 457 preq->preq_targets[i].target_flags = *iefrm_t++; 458 IEEE80211_ADDR_COPY( 459 preq->preq_targets[i].target_addr, iefrm_t); 460 iefrm_t += 6; 461 preq->preq_targets[i].target_seq = 462 LE_READ_4(iefrm_t); 463 iefrm_t += 4; 464 } 465 466 hwmp_recv_preq(vap, ni, wh, preq); 467 free(preq, M_80211_MESH_PREQ); 468 found++; 469 break; 470 } 471 case IEEE80211_ELEMID_MESHPREP: 472 { 473 iefrm_t = iefrm; 474 ndest = verify_mesh_prep_len(vap, wh, iefrm_t); 475 if (ndest < 0) { 476 vap->iv_stats.is_rx_mgtdiscard++; 477 break; 478 } 479 prep = malloc(sizeof(*prep), 480 M_80211_MESH_PREP, M_NOWAIT | M_ZERO); 481 KASSERT(prep != NULL, ("prep == NULL")); 482 483 prep->prep_ie = *iefrm_t++; 484 prep->prep_len = *iefrm_t++; 485 prep->prep_flags = *iefrm_t++; 486 prep->prep_hopcount = *iefrm_t++; 487 prep->prep_ttl = *iefrm_t++; 488 IEEE80211_ADDR_COPY(prep->prep_targetaddr, iefrm_t); 489 iefrm_t += 6; 490 prep->prep_targetseq = LE_READ_4(iefrm_t); iefrm_t += 4; 491 /* NB: May have Target Proxied Address */ 492 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 493 IEEE80211_ADDR_COPY( 494 prep->prep_target_ext_addr, iefrm_t); 495 iefrm_t += 6; 496 } 497 prep->prep_lifetime = LE_READ_4(iefrm_t); iefrm_t += 4; 498 prep->prep_metric = LE_READ_4(iefrm_t); iefrm_t += 4; 499 IEEE80211_ADDR_COPY(prep->prep_origaddr, iefrm_t); 500 iefrm_t += 6; 501 prep->prep_origseq = LE_READ_4(iefrm_t); iefrm_t += 4; 502 503 hwmp_recv_prep(vap, ni, wh, prep); 504 free(prep, M_80211_MESH_PREP); 505 found++; 506 break; 507 } 508 case IEEE80211_ELEMID_MESHPERR: 509 { 510 int i = 0; 511 512 iefrm_t = iefrm; 513 ndest = verify_mesh_perr_len(vap, wh, iefrm_t); 514 if (ndest < 0) { 515 vap->iv_stats.is_rx_mgtdiscard++; 516 break; 517 } 518 perr = malloc(sizeof(*perr) + 519 (ndest - 1) * sizeof(*perr->perr_dests), 520 M_80211_MESH_PERR, M_NOWAIT | M_ZERO); 521 KASSERT(perr != NULL, ("perr == NULL")); 522 523 perr->perr_ie = *iefrm_t++; 524 perr->perr_len = *iefrm_t++; 525 perr->perr_ttl = *iefrm_t++; 526 perr->perr_ndests = *iefrm_t++; 527 528 for (i = 0; i<perr->perr_ndests; i++) { 529 perr->perr_dests[i].dest_flags = *iefrm_t++; 530 IEEE80211_ADDR_COPY( 531 perr->perr_dests[i].dest_addr, iefrm_t); 532 iefrm_t += 6; 533 perr->perr_dests[i].dest_seq = LE_READ_4(iefrm_t); 534 iefrm_t += 4; 535 /* NB: May have Target Proxied Address */ 536 if (perr->perr_dests[i].dest_flags & 537 IEEE80211_MESHPERR_FLAGS_AE) { 538 IEEE80211_ADDR_COPY( 539 perr->perr_dests[i].dest_ext_addr, 540 iefrm_t); 541 iefrm_t += 6; 542 } 543 perr->perr_dests[i].dest_rcode = 544 LE_READ_2(iefrm_t); 545 iefrm_t += 2; 546 } 547 548 hwmp_recv_perr(vap, ni, wh, perr); 549 free(perr, M_80211_MESH_PERR); 550 found++; 551 break; 552 } 553 case IEEE80211_ELEMID_MESHRANN: 554 { 555 const struct ieee80211_meshrann_ie *mrann = 556 (const struct ieee80211_meshrann_ie *) iefrm; 557 if (mrann->rann_len != 558 sizeof(struct ieee80211_meshrann_ie) - 2) { 559 IEEE80211_DISCARD(vap, 560 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 561 wh, NULL, "%s", "RAN with wrong len"); 562 vap->iv_stats.is_rx_mgtdiscard++; 563 return 1; 564 } 565 memcpy(&rann, mrann, sizeof(rann)); 566 rann.rann_seq = LE_READ_4(&mrann->rann_seq); 567 rann.rann_interval = LE_READ_4(&mrann->rann_interval); 568 rann.rann_metric = LE_READ_4(&mrann->rann_metric); 569 hwmp_recv_rann(vap, ni, wh, &rann); 570 found++; 571 break; 572 } 573 } 574 iefrm += iefrm[1] + 2; 575 } 576 if (!found) { 577 IEEE80211_DISCARD(vap, 578 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 579 wh, NULL, "%s", "PATH SEL action without IE"); 580 vap->iv_stats.is_rx_mgtdiscard++; 581 } 582 return 0; 583 } 584 585 static int 586 hwmp_send_action(struct ieee80211vap *vap, 587 const uint8_t da[IEEE80211_ADDR_LEN], 588 uint8_t *ie, size_t len) 589 { 590 struct ieee80211_node *ni; 591 struct ieee80211com *ic; 592 struct ieee80211_bpf_params params; 593 struct mbuf *m; 594 uint8_t *frm; 595 596 if (IEEE80211_IS_MULTICAST(da)) { 597 ni = ieee80211_ref_node(vap->iv_bss); 598 #ifdef IEEE80211_DEBUG_REFCNT 599 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 600 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 601 __func__, __LINE__, 602 ni, ether_sprintf(ni->ni_macaddr), 603 ieee80211_node_refcnt(ni)+1); 604 #endif 605 ieee80211_ref_node(ni); 606 } 607 else 608 ni = ieee80211_mesh_find_txnode(vap, da); 609 610 if (vap->iv_state == IEEE80211_S_CAC) { 611 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 612 "block %s frame in CAC state", "HWMP action"); 613 vap->iv_stats.is_tx_badstate++; 614 return EIO; /* XXX */ 615 } 616 617 KASSERT(ni != NULL, ("null node")); 618 ic = ni->ni_ic; 619 620 m = ieee80211_getmgtframe(&frm, 621 ic->ic_headroom + sizeof(struct ieee80211_frame), 622 sizeof(struct ieee80211_action) + len 623 ); 624 if (m == NULL) { 625 ieee80211_free_node(ni); 626 vap->iv_stats.is_tx_nobuf++; 627 return ENOMEM; 628 } 629 *frm++ = IEEE80211_ACTION_CAT_MESH; 630 *frm++ = IEEE80211_ACTION_MESH_HWMP; 631 switch (*ie) { 632 case IEEE80211_ELEMID_MESHPREQ: 633 frm = hwmp_add_meshpreq(frm, 634 (struct ieee80211_meshpreq_ie *)ie); 635 break; 636 case IEEE80211_ELEMID_MESHPREP: 637 frm = hwmp_add_meshprep(frm, 638 (struct ieee80211_meshprep_ie *)ie); 639 break; 640 case IEEE80211_ELEMID_MESHPERR: 641 frm = hwmp_add_meshperr(frm, 642 (struct ieee80211_meshperr_ie *)ie); 643 break; 644 case IEEE80211_ELEMID_MESHRANN: 645 frm = hwmp_add_meshrann(frm, 646 (struct ieee80211_meshrann_ie *)ie); 647 break; 648 } 649 650 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 651 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 652 if (m == NULL) { 653 ieee80211_free_node(ni); 654 vap->iv_stats.is_tx_nobuf++; 655 return ENOMEM; 656 } 657 ieee80211_send_setup(ni, m, 658 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION, 659 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, vap->iv_myaddr); 660 661 m->m_flags |= M_ENCAP; /* mark encapsulated */ 662 IEEE80211_NODE_STAT(ni, tx_mgmt); 663 664 memset(¶ms, 0, sizeof(params)); 665 params.ibp_pri = WME_AC_VO; 666 params.ibp_rate0 = ni->ni_txparms->mgmtrate; 667 if (IEEE80211_IS_MULTICAST(da)) 668 params.ibp_try0 = 1; 669 else 670 params.ibp_try0 = ni->ni_txparms->maxretry; 671 params.ibp_power = ni->ni_txpower; 672 return ic->ic_raw_xmit(ni, m, ¶ms); 673 } 674 675 #define ADDSHORT(frm, v) do { \ 676 frm[0] = (v) & 0xff; \ 677 frm[1] = (v) >> 8; \ 678 frm += 2; \ 679 } while (0) 680 #define ADDWORD(frm, v) do { \ 681 LE_WRITE_4(frm, v); \ 682 frm += 4; \ 683 } while (0) 684 /* 685 * Add a Mesh Path Request IE to a frame. 686 */ 687 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags 688 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr 689 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq 690 static uint8_t * 691 hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq) 692 { 693 int i; 694 695 *frm++ = IEEE80211_ELEMID_MESHPREQ; 696 *frm++ = preq->preq_len; /* len already calculated */ 697 *frm++ = preq->preq_flags; 698 *frm++ = preq->preq_hopcount; 699 *frm++ = preq->preq_ttl; 700 ADDWORD(frm, preq->preq_id); 701 IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6; 702 ADDWORD(frm, preq->preq_origseq); 703 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 704 IEEE80211_ADDR_COPY(frm, preq->preq_orig_ext_addr); 705 frm += 6; 706 } 707 ADDWORD(frm, preq->preq_lifetime); 708 ADDWORD(frm, preq->preq_metric); 709 *frm++ = preq->preq_tcount; 710 for (i = 0; i < preq->preq_tcount; i++) { 711 *frm++ = PREQ_TFLAGS(i); 712 IEEE80211_ADDR_COPY(frm, PREQ_TADDR(i)); 713 frm += 6; 714 ADDWORD(frm, PREQ_TSEQ(i)); 715 } 716 return frm; 717 } 718 #undef PREQ_TFLAGS 719 #undef PREQ_TADDR 720 #undef PREQ_TSEQ 721 722 /* 723 * Add a Mesh Path Reply IE to a frame. 724 */ 725 static uint8_t * 726 hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep) 727 { 728 *frm++ = IEEE80211_ELEMID_MESHPREP; 729 *frm++ = prep->prep_len; /* len already calculated */ 730 *frm++ = prep->prep_flags; 731 *frm++ = prep->prep_hopcount; 732 *frm++ = prep->prep_ttl; 733 IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6; 734 ADDWORD(frm, prep->prep_targetseq); 735 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 736 IEEE80211_ADDR_COPY(frm, prep->prep_target_ext_addr); 737 frm += 6; 738 } 739 ADDWORD(frm, prep->prep_lifetime); 740 ADDWORD(frm, prep->prep_metric); 741 IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6; 742 ADDWORD(frm, prep->prep_origseq); 743 return frm; 744 } 745 746 /* 747 * Add a Mesh Path Error IE to a frame. 748 */ 749 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags 750 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr 751 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 752 #define PERR_EXTADDR(n) perr->perr_dests[n].dest_ext_addr 753 #define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode 754 static uint8_t * 755 hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr) 756 { 757 int i; 758 759 *frm++ = IEEE80211_ELEMID_MESHPERR; 760 *frm++ = perr->perr_len; /* len already calculated */ 761 *frm++ = perr->perr_ttl; 762 *frm++ = perr->perr_ndests; 763 for (i = 0; i < perr->perr_ndests; i++) { 764 *frm++ = PERR_DFLAGS(i); 765 IEEE80211_ADDR_COPY(frm, PERR_DADDR(i)); 766 frm += 6; 767 ADDWORD(frm, PERR_DSEQ(i)); 768 if (PERR_DFLAGS(i) & IEEE80211_MESHPERR_FLAGS_AE) { 769 IEEE80211_ADDR_COPY(frm, PERR_EXTADDR(i)); 770 frm += 6; 771 } 772 ADDSHORT(frm, PERR_DRCODE(i)); 773 } 774 return frm; 775 } 776 #undef PERR_DFLAGS 777 #undef PERR_DADDR 778 #undef PERR_DSEQ 779 #undef PERR_EXTADDR 780 #undef PERR_DRCODE 781 782 /* 783 * Add a Root Annoucement IE to a frame. 784 */ 785 static uint8_t * 786 hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann) 787 { 788 *frm++ = IEEE80211_ELEMID_MESHRANN; 789 *frm++ = rann->rann_len; 790 *frm++ = rann->rann_flags; 791 *frm++ = rann->rann_hopcount; 792 *frm++ = rann->rann_ttl; 793 IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6; 794 ADDWORD(frm, rann->rann_seq); 795 ADDWORD(frm, rann->rann_interval); 796 ADDWORD(frm, rann->rann_metric); 797 return frm; 798 } 799 800 static void 801 hwmp_rootmode_setup(struct ieee80211vap *vap) 802 { 803 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 804 struct ieee80211_mesh_state *ms = vap->iv_mesh; 805 806 switch (hs->hs_rootmode) { 807 case IEEE80211_HWMP_ROOTMODE_DISABLED: 808 callout_drain(&hs->hs_roottimer); 809 ms->ms_flags &= ~IEEE80211_MESHFLAGS_ROOT; 810 break; 811 case IEEE80211_HWMP_ROOTMODE_NORMAL: 812 case IEEE80211_HWMP_ROOTMODE_PROACTIVE: 813 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint, 814 hwmp_rootmode_cb, vap); 815 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT; 816 break; 817 case IEEE80211_HWMP_ROOTMODE_RANN: 818 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint, 819 hwmp_rootmode_rann_cb, vap); 820 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT; 821 break; 822 } 823 } 824 825 /* 826 * Send a broadcast Path Request to find all nodes on the mesh. We are 827 * called when the vap is configured as a HWMP root node. 828 */ 829 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 830 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr 831 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 832 static void 833 hwmp_rootmode_cb(void *arg) 834 { 835 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 836 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 837 struct ieee80211_mesh_state *ms = vap->iv_mesh; 838 struct ieee80211_meshpreq_ie preq; 839 840 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 841 "%s", "send broadcast PREQ"); 842 843 preq.preq_flags = 0; 844 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE) 845 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_GATE; 846 if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE) 847 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP; 848 preq.preq_hopcount = 0; 849 preq.preq_ttl = ms->ms_ttl; 850 preq.preq_id = ++hs->hs_preqid; 851 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 852 preq.preq_origseq = ++hs->hs_seq; 853 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout); 854 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 855 preq.preq_tcount = 1; 856 IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr); 857 PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO | 858 IEEE80211_MESHPREQ_TFLAGS_USN; 859 PREQ_TSEQ(0) = 0; 860 vap->iv_stats.is_hwmp_rootreqs++; 861 /* NB: we enforce rate check ourself */ 862 hwmp_send_preq(vap, broadcastaddr, &preq, NULL, NULL); 863 hwmp_rootmode_setup(vap); 864 } 865 #undef PREQ_TFLAGS 866 #undef PREQ_TADDR 867 #undef PREQ_TSEQ 868 869 /* 870 * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are 871 * called when the vap is configured as a HWMP RANN root node. 872 */ 873 static void 874 hwmp_rootmode_rann_cb(void *arg) 875 { 876 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 877 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 878 struct ieee80211_mesh_state *ms = vap->iv_mesh; 879 struct ieee80211_meshrann_ie rann; 880 881 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 882 "%s", "send broadcast RANN"); 883 884 rann.rann_flags = 0; 885 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE) 886 rann.rann_flags |= IEEE80211_MESHFLAGS_GATE; 887 rann.rann_hopcount = 0; 888 rann.rann_ttl = ms->ms_ttl; 889 IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr); 890 rann.rann_seq = ++hs->hs_seq; 891 rann.rann_interval = ieee80211_hwmp_rannint; 892 rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 893 894 vap->iv_stats.is_hwmp_rootrann++; 895 hwmp_send_rann(vap, broadcastaddr, &rann); 896 hwmp_rootmode_setup(vap); 897 } 898 899 /* 900 * Update forwarding information to TA if metric improves. 901 */ 902 static void 903 hwmp_update_transmitter(struct ieee80211vap *vap, struct ieee80211_node *ni, 904 const char *hwmp_frame) 905 { 906 struct ieee80211_mesh_state *ms = vap->iv_mesh; 907 struct ieee80211_mesh_route *rttran = NULL; /* Transmitter */ 908 int metric = 0; 909 910 rttran = ieee80211_mesh_rt_find(vap, ni->ni_macaddr); 911 if (rttran == NULL) { 912 rttran = ieee80211_mesh_rt_add(vap, ni->ni_macaddr); 913 if (rttran == NULL) { 914 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 915 "unable to add path to transmitter %6D of %s", 916 ni->ni_macaddr, ":", hwmp_frame); 917 vap->iv_stats.is_mesh_rtaddfailed++; 918 return; 919 } 920 } 921 metric = ms->ms_pmetric->mpm_metric(ni); 922 if (!(rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) || 923 rttran->rt_metric > metric) 924 { 925 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 926 "%s path to transmiter %6D of %s, metric %d:%d", 927 rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 928 "prefer" : "update", ni->ni_macaddr, ":", hwmp_frame, 929 rttran->rt_metric, metric); 930 IEEE80211_ADDR_COPY(rttran->rt_nexthop, ni->ni_macaddr); 931 rttran->rt_metric = metric; 932 rttran->rt_nhops = 1; 933 ieee80211_mesh_rt_update(rttran, ms->ms_ppath->mpp_inact); 934 rttran->rt_flags = IEEE80211_MESHRT_FLAGS_VALID; 935 } 936 } 937 938 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags 939 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr 940 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq 941 static void 942 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni, 943 const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq) 944 { 945 struct ieee80211_mesh_state *ms = vap->iv_mesh; 946 struct ieee80211_mesh_route *rtorig = NULL; 947 struct ieee80211_mesh_route *rtorig_ext = NULL; 948 struct ieee80211_mesh_route *rttarg = NULL; 949 struct ieee80211_hwmp_route *hrorig = NULL; 950 struct ieee80211_hwmp_route *hrtarg = NULL; 951 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 952 struct ieee80211_meshprep_ie prep; 953 ieee80211_hwmp_seq preqid; /* last seen preqid for orig */ 954 uint32_t metric = 0; 955 956 /* 957 * Ignore PREQs from us. Could happen because someone forward it 958 * back to us. 959 */ 960 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr)) 961 return; 962 963 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 964 "received PREQ, orig %6D, targ(0) %6D", preq->preq_origaddr, ":", 965 PREQ_TADDR(0), ":"); 966 967 /* 968 * Acceptance criteria: (if the PREQ is not for us or not broadcast, 969 * or an external mac address not proxied by us), 970 * AND forwarding is disabled, discard this PREQ. 971 */ 972 rttarg = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0)); 973 if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD) && 974 (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) || 975 !IEEE80211_IS_MULTICAST(PREQ_TADDR(0)) || 976 (rttarg != NULL && 977 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY && 978 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate)))) { 979 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 980 preq->preq_origaddr, NULL, "%s", "not accepting PREQ"); 981 return; 982 } 983 /* 984 * Acceptance criteria: if unicast addressed 985 * AND no valid forwarding for Target of PREQ, discard this PREQ. 986 */ 987 if(rttarg != NULL) 988 hrtarg = IEEE80211_MESH_ROUTE_PRIV(rttarg, 989 struct ieee80211_hwmp_route); 990 /* Address mode: ucast */ 991 if(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AM && 992 rttarg == NULL && 993 !IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) { 994 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 995 preq->preq_origaddr, NULL, 996 "unicast addressed PREQ of unknown target %6D", 997 PREQ_TADDR(0), ":"); 998 return; 999 } 1000 1001 /* PREQ ACCEPTED */ 1002 1003 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr); 1004 if (rtorig == NULL) { 1005 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr); 1006 if (rtorig == NULL) { 1007 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1008 "unable to add orig path to %6D", 1009 preq->preq_origaddr, ":"); 1010 vap->iv_stats.is_mesh_rtaddfailed++; 1011 return; 1012 } 1013 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1014 "adding originator %6D", preq->preq_origaddr, ":"); 1015 } 1016 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route); 1017 1018 /* record last seen preqid */ 1019 preqid = hrorig->hr_preqid; 1020 hrorig->hr_preqid = HWMP_SEQ_MAX(hrorig->hr_preqid, preq->preq_id); 1021 1022 /* Data creation and update of forwarding information 1023 * according to Table 11C-8 for originator mesh STA. 1024 */ 1025 metric = preq->preq_metric + ms->ms_pmetric->mpm_metric(ni); 1026 if (HWMP_SEQ_GT(preq->preq_origseq, hrorig->hr_seq) || 1027 (HWMP_SEQ_EQ(preq->preq_origseq, hrorig->hr_seq) && 1028 metric < rtorig->rt_metric)) { 1029 hrorig->hr_seq = preq->preq_origseq; 1030 IEEE80211_ADDR_COPY(rtorig->rt_nexthop, wh->i_addr2); 1031 rtorig->rt_metric = metric; 1032 rtorig->rt_nhops = preq->preq_hopcount + 1; 1033 ieee80211_mesh_rt_update(rtorig, preq->preq_lifetime); 1034 /* Path to orig is valid now. 1035 * NB: we know it can't be Proxy, and if it is GATE 1036 * it will be marked below. 1037 */ 1038 rtorig->rt_flags = IEEE80211_MESHRT_FLAGS_VALID; 1039 } else if ((hrtarg != NULL && 1040 !HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0))) || 1041 (rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1042 preqid >= preq->preq_id)) { 1043 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1044 "discard PREQ from %6D, old seqno %u <= %u," 1045 " or old preqid %u < %u", 1046 preq->preq_origaddr, ":", 1047 preq->preq_origseq, hrorig->hr_seq, 1048 preq->preq_id, preqid); 1049 return; 1050 } 1051 1052 /* Update forwarding information to TA if metric improves. */ 1053 hwmp_update_transmitter(vap, ni, "PREQ"); 1054 1055 /* 1056 * Check if the PREQ is addressed to us. 1057 * or a Proxy currently gated by us. 1058 */ 1059 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) || 1060 (ms->ms_flags & IEEE80211_MESHFLAGS_GATE && 1061 rttarg != NULL && 1062 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate) && 1063 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY && 1064 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 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 prep.prep_flags = 0; 1148 prep.prep_hopcount = 0; 1149 prep.prep_ttl = ms->ms_ttl; 1150 IEEE80211_ADDR_COPY(prep.prep_origaddr, 1151 preq->preq_origaddr); 1152 prep.prep_origseq = preq->preq_origseq; 1153 prep.prep_lifetime = preq->preq_lifetime; 1154 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1155 IEEE80211_ADDR_COPY(prep.prep_targetaddr, 1156 vap->iv_myaddr); 1157 prep.prep_targetseq = ++hs->hs_seq; 1158 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep); 1159 } 1160 } 1161 1162 /* 1163 * Forwarding and Intermediate reply for PREQs with 1 target. 1164 */ 1165 if ((preq->preq_tcount == 1) && (preq->preq_ttl > 1) && 1166 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) { 1167 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */ 1168 1169 memcpy(&ppreq, preq, sizeof(ppreq)); 1170 1171 /* 1172 * We have a valid route to this node. 1173 * NB: if target is proxy dont reply. 1174 */ 1175 if (rttarg != NULL && 1176 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1177 !(rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)) { 1178 /* 1179 * Check if we can send an intermediate Path Reply, 1180 * i.e., Target Only bit is not set and target is not 1181 * the MAC broadcast address. 1182 */ 1183 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO) && 1184 !IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr)) { 1185 struct ieee80211_meshprep_ie prep; 1186 1187 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1188 "intermediate reply for PREQ from %6D", 1189 preq->preq_origaddr, ":"); 1190 prep.prep_flags = 0; 1191 prep.prep_hopcount = rttarg->rt_nhops; 1192 prep.prep_ttl = ms->ms_ttl; 1193 IEEE80211_ADDR_COPY(&prep.prep_targetaddr, 1194 PREQ_TADDR(0)); 1195 prep.prep_targetseq = hrtarg->hr_seq; 1196 prep.prep_lifetime = preq->preq_lifetime; 1197 prep.prep_metric =rttarg->rt_metric; 1198 IEEE80211_ADDR_COPY(&prep.prep_origaddr, 1199 preq->preq_origaddr); 1200 prep.prep_origseq = hrorig->hr_seq; 1201 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep); 1202 1203 /* 1204 * Set TO and unset RF bits because we have 1205 * sent a PREP. 1206 */ 1207 ppreq.preq_targets[0].target_flags |= 1208 IEEE80211_MESHPREQ_TFLAGS_TO; 1209 } 1210 } 1211 1212 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1213 "forward PREQ from %6D", 1214 preq->preq_origaddr, ":"); 1215 ppreq.preq_hopcount += 1; 1216 ppreq.preq_ttl -= 1; 1217 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni); 1218 1219 /* don't do PREQ ratecheck when we propagate */ 1220 hwmp_send_preq(vap, broadcastaddr, &ppreq, NULL, NULL); 1221 } 1222 } 1223 #undef PREQ_TFLAGS 1224 #undef PREQ_TADDR 1225 #undef PREQ_TSEQ 1226 1227 static int 1228 hwmp_send_preq(struct ieee80211vap *vap, 1229 const uint8_t da[IEEE80211_ADDR_LEN], 1230 struct ieee80211_meshpreq_ie *preq, 1231 struct timeval *last, struct timeval *minint) 1232 { 1233 1234 /* 1235 * Enforce PREQ interval. 1236 * NB: Proactive ROOT PREQs rate is handled by cb task. 1237 */ 1238 if (last != NULL && minint != NULL) { 1239 if (ratecheck(last, minint) == 0) 1240 return EALREADY; /* XXX: we should postpone */ 1241 getmicrouptime(last); 1242 } 1243 1244 /* 1245 * mesh preq action frame format 1246 * [6] da 1247 * [6] sa 1248 * [6] addr3 = sa 1249 * [1] action 1250 * [1] category 1251 * [tlv] mesh path request 1252 */ 1253 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ; 1254 preq->preq_len = (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE ? 1255 IEEE80211_MESHPREQ_BASE_SZ_AE : IEEE80211_MESHPREQ_BASE_SZ) + 1256 preq->preq_tcount * IEEE80211_MESHPREQ_TRGT_SZ; 1257 return hwmp_send_action(vap, da, (uint8_t *)preq, preq->preq_len+2); 1258 } 1259 1260 static void 1261 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni, 1262 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep) 1263 { 1264 #define IS_PROXY(rt) (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) 1265 #define PROXIED_BY_US(rt) \ 1266 (IEEE80211_ADDR_EQ(vap->iv_myaddr, rt->rt_mesh_gate)) 1267 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1268 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1269 struct ieee80211_mesh_route *rt = NULL; 1270 struct ieee80211_mesh_route *rtorig = NULL; 1271 struct ieee80211_mesh_route *rtext = NULL; 1272 struct ieee80211_hwmp_route *hr; 1273 struct ieee80211com *ic = vap->iv_ic; 1274 struct ifnet *ifp = vap->iv_ifp; 1275 struct mbuf *m, *next; 1276 uint32_t metric = 0; 1277 const uint8_t *addr; 1278 int is_encap; 1279 struct ieee80211_node *ni_encap; 1280 1281 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1282 "received PREP, orig %6D, targ %6D", prep->prep_origaddr, ":", 1283 prep->prep_targetaddr, ":"); 1284 1285 /* 1286 * Acceptance criteria: (If the corresponding PREP was not generated 1287 * by us OR not generated by an external mac that is not proxied by us) 1288 * AND forwarding is disabled, discard this PREP. 1289 */ 1290 rtorig = ieee80211_mesh_rt_find(vap, prep->prep_origaddr); 1291 if ((!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) || 1292 (rtorig != NULL && IS_PROXY(rtorig) && !PROXIED_BY_US(rtorig))) && 1293 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)){ 1294 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1295 "discard PREP, orig(%6D) not proxied or generated by us", 1296 prep->prep_origaddr, ":"); 1297 return; 1298 } 1299 1300 /* PREP ACCEPTED */ 1301 1302 /* 1303 * If accepted shall create or update the active forwarding information 1304 * it maintains for the target mesh STA of the PREP (according to the 1305 * rules defined in 13.10.8.4). If the conditions for creating or 1306 * updating the forwarding information have not been met in those 1307 * rules, no further steps are applied to the PREP. 1308 */ 1309 rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr); 1310 if (rt == NULL) { 1311 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr); 1312 if (rt == NULL) { 1313 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1314 "unable to add PREP path to %6D", 1315 prep->prep_targetaddr, ":"); 1316 vap->iv_stats.is_mesh_rtaddfailed++; 1317 return; 1318 } 1319 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1320 "adding target %6D", prep->prep_targetaddr, ":"); 1321 } 1322 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1323 /* update path metric */ 1324 metric = prep->prep_metric + ms->ms_pmetric->mpm_metric(ni); 1325 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 1326 if (HWMP_SEQ_LT(prep->prep_targetseq, hr->hr_seq)) { 1327 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1328 "discard PREP from %6D, old seq no %u < %u", 1329 prep->prep_targetaddr, ":", 1330 prep->prep_targetseq, hr->hr_seq); 1331 return; 1332 } else if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq) && 1333 metric > rt->rt_metric) { 1334 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1335 "discard PREP from %6D, new metric %u > %u", 1336 prep->prep_targetaddr, ":", 1337 metric, rt->rt_metric); 1338 return; 1339 } 1340 } 1341 1342 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1343 "%s path to %6D, hopcount %d:%d metric %d:%d", 1344 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1345 "prefer" : "update", 1346 prep->prep_targetaddr, ":", 1347 rt->rt_nhops, prep->prep_hopcount + 1, 1348 rt->rt_metric, metric); 1349 1350 hr->hr_seq = prep->prep_targetseq; 1351 hr->hr_preqretries = 0; 1352 IEEE80211_ADDR_COPY(rt->rt_nexthop, ni->ni_macaddr); 1353 rt->rt_metric = metric; 1354 rt->rt_nhops = prep->prep_hopcount + 1; 1355 ieee80211_mesh_rt_update(rt, prep->prep_lifetime); 1356 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) { 1357 /* discovery complete */ 1358 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_DISCOVER; 1359 } 1360 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; /* mark valid */ 1361 1362 /* Update forwarding information to TA if metric improves */ 1363 hwmp_update_transmitter(vap, ni, "PREP"); 1364 1365 /* 1366 * If it's NOT for us, propagate the PREP 1367 */ 1368 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) && 1369 prep->prep_ttl > 1 && 1370 prep->prep_hopcount < hs->hs_maxhops) { 1371 struct ieee80211_meshprep_ie pprep; /* propagated PREP */ 1372 /* 1373 * NB: We should already have setup the path to orig 1374 * mesh STA when we propagated PREQ to target mesh STA, 1375 * no PREP is generated without a corresponding PREQ. 1376 * XXX: for now just ignore. 1377 */ 1378 if (rtorig == NULL) { 1379 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1380 "received PREP for an unknown orig(%6D)", 1381 prep->prep_origaddr, ":"); 1382 return; 1383 } 1384 1385 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1386 "propagate PREP from %6D", 1387 prep->prep_targetaddr, ":"); 1388 1389 memcpy(&pprep, prep, sizeof(pprep)); 1390 pprep.prep_hopcount += 1; 1391 pprep.prep_ttl -= 1; 1392 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni); 1393 hwmp_send_prep(vap, rtorig->rt_nexthop, &pprep); 1394 1395 /* precursor list for the Target Mesh STA Address is updated */ 1396 } 1397 1398 /* 1399 * Check if we received a PREP w/ AE and store target external address. 1400 * We may store target external address if recevied PREP w/ AE 1401 * and we are not final destination 1402 */ 1403 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 1404 rtext = ieee80211_mesh_rt_find(vap, 1405 prep->prep_target_ext_addr); 1406 if (rtext == NULL) { 1407 rtext = ieee80211_mesh_rt_add(vap, 1408 prep->prep_target_ext_addr); 1409 if (rtext == NULL) { 1410 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1411 "unable to add PREP path to proxy %6D", 1412 prep->prep_targetaddr, ":"); 1413 vap->iv_stats.is_mesh_rtaddfailed++; 1414 return; 1415 } 1416 } 1417 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1418 "%s path to %6D, hopcount %d:%d metric %d:%d", 1419 rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1420 "prefer" : "update", 1421 prep->prep_target_ext_addr, ":", 1422 rtext->rt_nhops, prep->prep_hopcount + 1, 1423 rtext->rt_metric, metric); 1424 1425 rtext->rt_flags = IEEE80211_MESHRT_FLAGS_PROXY | 1426 IEEE80211_MESHRT_FLAGS_VALID; 1427 IEEE80211_ADDR_COPY(rtext->rt_dest, 1428 prep->prep_target_ext_addr); 1429 IEEE80211_ADDR_COPY(rtext->rt_mesh_gate, 1430 prep->prep_targetaddr); 1431 IEEE80211_ADDR_COPY(rtext->rt_nexthop, wh->i_addr2); 1432 rtext->rt_metric = metric; 1433 rtext->rt_lifetime = prep->prep_lifetime; 1434 rtext->rt_nhops = prep->prep_hopcount + 1; 1435 rtext->rt_ext_seq = prep->prep_origseq; /* new proxy seq */ 1436 /* 1437 * XXX: proxy entries have no HWMP priv data, 1438 * nullify them to be sure? 1439 */ 1440 } 1441 /* 1442 * Check for frames queued awaiting path discovery. 1443 * XXX probably can tell exactly and avoid remove call 1444 * NB: hash may have false matches, if so they will get 1445 * stuck back on the stageq because there won't be 1446 * a path. 1447 */ 1448 addr = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ? 1449 prep->prep_target_ext_addr : prep->prep_targetaddr; 1450 m = ieee80211_ageq_remove(&ic->ic_stageq, 1451 (struct ieee80211_node *)(uintptr_t) 1452 ieee80211_mac_hash(ic, addr)); /* either dest or ext_dest */ 1453 for (; m != NULL; m = next) { 1454 is_encap = !! (m->m_flags & M_ENCAP); 1455 ni_encap = (struct ieee80211_node *) m->m_pkthdr.rcvif; 1456 next = m->m_nextpkt; 1457 m->m_nextpkt = NULL; 1458 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1459 "flush queued frame %p len %d", m, m->m_pkthdr.len); 1460 1461 /* 1462 * If the mbuf has M_ENCAP set, ensure we free it. 1463 * Note that after if_transmit() is called, m is invalid. 1464 */ 1465 if (ifp->if_transmit(ifp, m) != 0) { 1466 if (is_encap) 1467 ieee80211_free_node(ni_encap); 1468 } 1469 } 1470 #undef IS_PROXY 1471 #undef PROXIED_BY_US 1472 } 1473 1474 static int 1475 hwmp_send_prep(struct ieee80211vap *vap, 1476 const uint8_t da[IEEE80211_ADDR_LEN], 1477 struct ieee80211_meshprep_ie *prep) 1478 { 1479 /* NB: there's no PREP minimum interval. */ 1480 1481 /* 1482 * mesh prep action frame format 1483 * [6] da 1484 * [6] sa 1485 * [6] addr3 = sa 1486 * [1] action 1487 * [1] category 1488 * [tlv] mesh path reply 1489 */ 1490 prep->prep_ie = IEEE80211_ELEMID_MESHPREP; 1491 prep->prep_len = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ? 1492 IEEE80211_MESHPREP_BASE_SZ_AE : IEEE80211_MESHPREP_BASE_SZ; 1493 return hwmp_send_action(vap, da, (uint8_t *)prep, prep->prep_len + 2); 1494 } 1495 1496 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1497 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1498 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1499 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1500 static void 1501 hwmp_peerdown(struct ieee80211_node *ni) 1502 { 1503 struct ieee80211vap *vap = ni->ni_vap; 1504 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1505 struct ieee80211_meshperr_ie perr; 1506 struct ieee80211_mesh_route *rt; 1507 struct ieee80211_hwmp_route *hr; 1508 1509 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr); 1510 if (rt == NULL) 1511 return; 1512 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1513 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1514 "%s", "delete route entry"); 1515 perr.perr_ttl = ms->ms_ttl; 1516 perr.perr_ndests = 1; 1517 PERR_DFLAGS(0) = 0; 1518 if (hr->hr_seq == 0) 1519 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN; 1520 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC; 1521 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest); 1522 PERR_DSEQ(0) = ++hr->hr_seq; 1523 PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH; 1524 /* NB: flush everything passing through peer */ 1525 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr); 1526 hwmp_send_perr(vap, broadcastaddr, &perr); 1527 } 1528 #undef PERR_DFLAGS 1529 #undef PERR_DADDR 1530 #undef PERR_DSEQ 1531 #undef PERR_DRCODE 1532 1533 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags 1534 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr 1535 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 1536 #define PERR_DEXTADDR(n) perr->perr_dests[n].dest_ext_addr 1537 #define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode 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 = malloc(sizeof(*perr) + 31*sizeof(*perr->perr_dests), 1558 M_80211_MESH_PERR, 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 free(pperr, M_80211_MESH_PERR); 1634 } 1635 #undef PERR_DFLAGS 1636 #undef PERR_DADDR 1637 #undef PERR_DSEQ 1638 #undef PERR_DEXTADDR 1639 #undef PERR_DRCODE 1640 1641 static int 1642 hwmp_send_perr(struct ieee80211vap *vap, 1643 const uint8_t da[IEEE80211_ADDR_LEN], 1644 struct ieee80211_meshperr_ie *perr) 1645 { 1646 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1647 int i; 1648 uint8_t length = 0; 1649 1650 /* 1651 * Enforce PERR interval. 1652 */ 1653 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0) 1654 return EALREADY; 1655 getmicrouptime(&hs->hs_lastperr); 1656 1657 /* 1658 * mesh perr action frame format 1659 * [6] da 1660 * [6] sa 1661 * [6] addr3 = sa 1662 * [1] action 1663 * [1] category 1664 * [tlv] mesh path error 1665 */ 1666 perr->perr_ie = IEEE80211_ELEMID_MESHPERR; 1667 length = IEEE80211_MESHPERR_BASE_SZ; 1668 for (i = 0; i<perr->perr_ndests; i++) { 1669 if (perr->perr_dests[i].dest_flags & 1670 IEEE80211_MESHPERR_FLAGS_AE) { 1671 length += IEEE80211_MESHPERR_DEST_SZ_AE; 1672 continue ; 1673 } 1674 length += IEEE80211_MESHPERR_DEST_SZ; 1675 } 1676 perr->perr_len =length; 1677 return hwmp_send_action(vap, da, (uint8_t *)perr, perr->perr_len+2); 1678 } 1679 1680 /* 1681 * Called from the rest of the net80211 code (mesh code for example). 1682 * NB: IEEE80211_REASON_MESH_PERR_DEST_UNREACH can be trigger by the fact that 1683 * a mesh STA is unable to forward an MSDU/MMPDU to a next-hop mesh STA. 1684 */ 1685 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1686 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1687 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1688 #define PERR_DEXTADDR(n) perr.perr_dests[n].dest_ext_addr 1689 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1690 static void 1691 hwmp_senderror(struct ieee80211vap *vap, 1692 const uint8_t addr[IEEE80211_ADDR_LEN], 1693 struct ieee80211_mesh_route *rt, int rcode) 1694 { 1695 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1696 struct ieee80211_hwmp_route *hr = NULL; 1697 struct ieee80211_meshperr_ie perr; 1698 1699 if (rt != NULL) 1700 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1701 struct ieee80211_hwmp_route); 1702 1703 perr.perr_ndests = 1; 1704 perr.perr_ttl = ms->ms_ttl; 1705 PERR_DFLAGS(0) = 0; 1706 PERR_DRCODE(0) = rcode; 1707 1708 switch (rcode) { 1709 case IEEE80211_REASON_MESH_PERR_NO_FI: 1710 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr); 1711 PERR_DSEQ(0) = 0; /* reserved */ 1712 break; 1713 case IEEE80211_REASON_MESH_PERR_NO_PROXY: 1714 KASSERT(rt != NULL, ("no proxy info for sending PERR")); 1715 KASSERT(rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY, 1716 ("route is not marked proxy")); 1717 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_FLAGS_AE; 1718 IEEE80211_ADDR_COPY(PERR_DADDR(0), vap->iv_myaddr); 1719 PERR_DSEQ(0) = rt->rt_ext_seq; 1720 IEEE80211_ADDR_COPY(PERR_DEXTADDR(0), addr); 1721 break; 1722 case IEEE80211_REASON_MESH_PERR_DEST_UNREACH: 1723 KASSERT(rt != NULL, ("no route info for sending PERR")); 1724 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr); 1725 PERR_DSEQ(0) = hr->hr_seq; 1726 break; 1727 default: 1728 KASSERT(0, ("unknown reason code for HWMP PERR (%u)", rcode)); 1729 } 1730 hwmp_send_perr(vap, broadcastaddr, &perr); 1731 } 1732 #undef PERR_DFLAGS 1733 #undef PEER_DADDR 1734 #undef PERR_DSEQ 1735 #undef PERR_DEXTADDR 1736 #undef PERR_DRCODE 1737 1738 static void 1739 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni, 1740 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann) 1741 { 1742 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1743 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1744 struct ieee80211_mesh_route *rt = NULL; 1745 struct ieee80211_hwmp_route *hr; 1746 struct ieee80211_meshpreq_ie preq; 1747 struct ieee80211_meshrann_ie prann; 1748 uint32_t metric = 0; 1749 1750 if (IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr)) 1751 return; 1752 1753 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr); 1754 if (rt != NULL && rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) { 1755 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1756 1757 /* Acceptance criteria: if RANN.seq < stored seq, discard RANN */ 1758 if (HWMP_SEQ_LT(rann->rann_seq, hr->hr_seq)) { 1759 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1760 "RANN seq %u < %u", rann->rann_seq, hr->hr_seq); 1761 return; 1762 } 1763 1764 /* Acceptance criteria: if RANN.seq == stored seq AND 1765 * RANN.metric > stored metric, discard RANN */ 1766 if (HWMP_SEQ_EQ(rann->rann_seq, hr->hr_seq) && 1767 rann->rann_metric > rt->rt_metric) { 1768 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1769 "RANN metric %u > %u", rann->rann_metric, rt->rt_metric); 1770 return; 1771 } 1772 } 1773 1774 /* RANN ACCEPTED */ 1775 1776 ieee80211_hwmp_rannint = rann->rann_interval; /* XXX: mtx lock? */ 1777 metric = rann->rann_metric + ms->ms_pmetric->mpm_metric(ni); 1778 1779 if (rt == NULL) { 1780 rt = ieee80211_mesh_rt_add(vap, rann->rann_addr); 1781 if (rt == NULL) { 1782 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1783 "unable to add mac for RANN root %6D", 1784 rann->rann_addr, ":"); 1785 vap->iv_stats.is_mesh_rtaddfailed++; 1786 return; 1787 } 1788 } 1789 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1790 /* Check if root is a mesh gate, mark it */ 1791 if (rann->rann_flags & IEEE80211_MESHRANN_FLAGS_GATE) { 1792 struct ieee80211_mesh_gate_route *gr; 1793 1794 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE; 1795 gr = ieee80211_mesh_mark_gate(vap, rann->rann_addr, 1796 rt); 1797 gr->gr_lastseq = 0; /* NOT GANN */ 1798 } 1799 /* discovery timeout */ 1800 ieee80211_mesh_rt_update(rt, 1801 ticks_to_msecs(ieee80211_hwmp_roottimeout)); 1802 1803 preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM; 1804 preq.preq_hopcount = 0; 1805 preq.preq_ttl = ms->ms_ttl; 1806 preq.preq_id = 0; /* reserved */ 1807 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1808 preq.preq_origseq = ++hs->hs_seq; 1809 preq.preq_lifetime = ieee80211_hwmp_roottimeout; 1810 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1811 preq.preq_tcount = 1; 1812 preq.preq_targets[0].target_flags = IEEE80211_MESHPREQ_TFLAGS_TO; 1813 /* NB: IEEE80211_MESHPREQ_TFLAGS_USN = 0 implicitly implied */ 1814 IEEE80211_ADDR_COPY(preq.preq_targets[0].target_addr, rann->rann_addr); 1815 preq.preq_targets[0].target_seq = rann->rann_seq; 1816 /* XXX: if rootconfint have not passed, we built this preq in vain */ 1817 hwmp_send_preq(vap, wh->i_addr2, &preq, &hr->hr_lastrootconf, 1818 &ieee80211_hwmp_rootconfint); 1819 1820 /* propagate a RANN */ 1821 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1822 rann->rann_ttl > 1 && 1823 ms->ms_flags & IEEE80211_MESHFLAGS_FWD) { 1824 hr->hr_seq = rann->rann_seq; 1825 memcpy(&prann, rann, sizeof(prann)); 1826 prann.rann_hopcount += 1; 1827 prann.rann_ttl -= 1; 1828 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni); 1829 hwmp_send_rann(vap, broadcastaddr, &prann); 1830 } 1831 } 1832 1833 static int 1834 hwmp_send_rann(struct ieee80211vap *vap, 1835 const uint8_t da[IEEE80211_ADDR_LEN], 1836 struct ieee80211_meshrann_ie *rann) 1837 { 1838 /* 1839 * mesh rann action frame format 1840 * [6] da 1841 * [6] sa 1842 * [6] addr3 = sa 1843 * [1] action 1844 * [1] category 1845 * [tlv] root annoucement 1846 */ 1847 rann->rann_ie = IEEE80211_ELEMID_MESHRANN; 1848 rann->rann_len = IEEE80211_MESHRANN_BASE_SZ; 1849 return hwmp_send_action(vap, da, (uint8_t *)rann, rann->rann_len + 2); 1850 } 1851 1852 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 1853 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr 1854 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 1855 static void 1856 hwmp_rediscover_cb(void *arg) 1857 { 1858 struct ieee80211_mesh_route *rt = arg; 1859 struct ieee80211vap *vap = rt->rt_vap; 1860 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1861 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1862 struct ieee80211_hwmp_route *hr; 1863 struct ieee80211_meshpreq_ie preq; /* Optimize: storing first preq? */ 1864 1865 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) 1866 return ; /* nothing to do */ 1867 1868 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1869 if (hr->hr_preqretries >= 1870 ieee80211_hwmp_maxpreq_retries) { 1871 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, 1872 rt->rt_dest, "%s", 1873 "max number of discovery, send queued frames to GATE"); 1874 ieee80211_mesh_forward_to_gates(vap, rt); 1875 vap->iv_stats.is_mesh_fwd_nopath++; 1876 return ; /* XXX: flush queue? */ 1877 } 1878 1879 hr->hr_preqretries++; 1880 1881 1882 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, rt->rt_dest, 1883 "start path rediscovery , target seq %u", hr->hr_seq); 1884 /* 1885 * Try to discover the path for this node. 1886 * Group addressed PREQ Case A 1887 */ 1888 preq.preq_flags = 0; 1889 preq.preq_hopcount = 0; 1890 preq.preq_ttl = ms->ms_ttl; 1891 preq.preq_id = ++hs->hs_preqid; 1892 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1893 preq.preq_origseq = hr->hr_origseq; 1894 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_pathtimeout); 1895 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1896 preq.preq_tcount = 1; 1897 IEEE80211_ADDR_COPY(PREQ_TADDR(0), rt->rt_dest); 1898 PREQ_TFLAGS(0) = 0; 1899 if (ieee80211_hwmp_targetonly) 1900 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 1901 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 1902 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */ 1903 /* XXX check return value */ 1904 hwmp_send_preq(vap, broadcastaddr, &preq, &hr->hr_lastpreq, 1905 &ieee80211_hwmp_preqminint); 1906 callout_reset(&rt->rt_discovery, 1907 ieee80211_hwmp_net_diameter_traversaltime * 2, 1908 hwmp_rediscover_cb, rt); 1909 } 1910 1911 static struct ieee80211_node * 1912 hwmp_discover(struct ieee80211vap *vap, 1913 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m) 1914 { 1915 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1916 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1917 struct ieee80211_mesh_route *rt = NULL; 1918 struct ieee80211_hwmp_route *hr; 1919 struct ieee80211_meshpreq_ie preq; 1920 struct ieee80211_node *ni; 1921 int sendpreq = 0; 1922 1923 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1924 ("not a mesh vap, opmode %d", vap->iv_opmode)); 1925 1926 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest), 1927 ("%s: discovering self!", __func__)); 1928 1929 ni = NULL; 1930 if (!IEEE80211_IS_MULTICAST(dest)) { 1931 rt = ieee80211_mesh_rt_find(vap, dest); 1932 if (rt == NULL) { 1933 rt = ieee80211_mesh_rt_add(vap, dest); 1934 if (rt == NULL) { 1935 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 1936 ni, "unable to add discovery path to %6D", 1937 dest, ":"); 1938 vap->iv_stats.is_mesh_rtaddfailed++; 1939 goto done; 1940 } 1941 } 1942 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1943 struct ieee80211_hwmp_route); 1944 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) { 1945 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1946 "%s", "already discovering queue frame until path found"); 1947 sendpreq = 1; 1948 goto done; 1949 } 1950 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) { 1951 if (hr->hr_lastdiscovery != 0 && 1952 (ticks - hr->hr_lastdiscovery < 1953 (ieee80211_hwmp_net_diameter_traversaltime * 2))) { 1954 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 1955 dest, NULL, "%s", 1956 "too frequent discovery requeust"); 1957 sendpreq = 1; 1958 goto done; 1959 } 1960 hr->hr_lastdiscovery = ticks; 1961 if (hr->hr_preqretries >= 1962 ieee80211_hwmp_maxpreq_retries) { 1963 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 1964 dest, NULL, "%s", 1965 "no valid path , max number of discovery"); 1966 vap->iv_stats.is_mesh_fwd_nopath++; 1967 goto done; 1968 } 1969 rt->rt_flags = IEEE80211_MESHRT_FLAGS_DISCOVER; 1970 hr->hr_preqretries++; 1971 if (hr->hr_origseq == 0) 1972 hr->hr_origseq = ++hs->hs_seq; 1973 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1974 sendpreq = 1; 1975 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1976 "start path discovery (src %s), target seq %u", 1977 m == NULL ? "<none>" : ether_sprintf( 1978 mtod(m, struct ether_header *)->ether_shost), 1979 hr->hr_seq); 1980 /* 1981 * Try to discover the path for this node. 1982 * Group addressed PREQ Case A 1983 */ 1984 preq.preq_flags = 0; 1985 preq.preq_hopcount = 0; 1986 preq.preq_ttl = ms->ms_ttl; 1987 preq.preq_id = ++hs->hs_preqid; 1988 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1989 preq.preq_origseq = hr->hr_origseq; 1990 preq.preq_lifetime = 1991 ticks_to_msecs(ieee80211_hwmp_pathtimeout); 1992 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1993 preq.preq_tcount = 1; 1994 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest); 1995 PREQ_TFLAGS(0) = 0; 1996 if (ieee80211_hwmp_targetonly) 1997 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 1998 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 1999 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */ 2000 /* XXX check return value */ 2001 hwmp_send_preq(vap, broadcastaddr, &preq, 2002 &hr->hr_lastpreq, &ieee80211_hwmp_preqminint); 2003 callout_reset(&rt->rt_discovery, 2004 ieee80211_hwmp_net_diameter_traversaltime * 2, 2005 hwmp_rediscover_cb, rt); 2006 } 2007 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) 2008 ni = ieee80211_find_txnode(vap, rt->rt_nexthop); 2009 } else { 2010 ni = ieee80211_find_txnode(vap, dest); 2011 /* NB: if null then we leak mbuf */ 2012 KASSERT(ni != NULL, ("leak mcast frame")); 2013 return ni; 2014 } 2015 done: 2016 if (ni == NULL && m != NULL) { 2017 if (sendpreq) { 2018 struct ieee80211com *ic = vap->iv_ic; 2019 /* 2020 * Queue packet for transmit when path discovery 2021 * completes. If discovery never completes the 2022 * frame will be flushed by way of the aging timer. 2023 */ 2024 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 2025 "%s", "queue frame until path found"); 2026 m->m_pkthdr.rcvif = (void *)(uintptr_t) 2027 ieee80211_mac_hash(ic, dest); 2028 /* XXX age chosen randomly */ 2029 ieee80211_ageq_append(&ic->ic_stageq, m, 2030 IEEE80211_INACT_WAIT); 2031 } else { 2032 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 2033 dest, NULL, "%s", "no valid path to this node"); 2034 m_freem(m); 2035 } 2036 } 2037 return ni; 2038 } 2039 #undef PREQ_TFLAGS 2040 #undef PREQ_TADDR 2041 #undef PREQ_TSEQ 2042 2043 static int 2044 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 2045 { 2046 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 2047 int error; 2048 2049 if (vap->iv_opmode != IEEE80211_M_MBSS) 2050 return ENOSYS; 2051 error = 0; 2052 switch (ireq->i_type) { 2053 case IEEE80211_IOC_HWMP_ROOTMODE: 2054 ireq->i_val = hs->hs_rootmode; 2055 break; 2056 case IEEE80211_IOC_HWMP_MAXHOPS: 2057 ireq->i_val = hs->hs_maxhops; 2058 break; 2059 default: 2060 return ENOSYS; 2061 } 2062 return error; 2063 } 2064 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211); 2065 2066 static int 2067 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 2068 { 2069 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 2070 int error; 2071 2072 if (vap->iv_opmode != IEEE80211_M_MBSS) 2073 return ENOSYS; 2074 error = 0; 2075 switch (ireq->i_type) { 2076 case IEEE80211_IOC_HWMP_ROOTMODE: 2077 if (ireq->i_val < 0 || ireq->i_val > 3) 2078 return EINVAL; 2079 hs->hs_rootmode = ireq->i_val; 2080 hwmp_rootmode_setup(vap); 2081 break; 2082 case IEEE80211_IOC_HWMP_MAXHOPS: 2083 if (ireq->i_val <= 0 || ireq->i_val > 255) 2084 return EINVAL; 2085 hs->hs_maxhops = ireq->i_val; 2086 break; 2087 default: 2088 return ENOSYS; 2089 } 2090 return error; 2091 } 2092 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211); 2093