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