ieee80211_hwmp.c revision 246510
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: head/sys/net80211/ieee80211_hwmp.c 246510 2013-02-07 21:25:32Z monthadar $"); 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 67static void hwmp_vattach(struct ieee80211vap *); 68static void hwmp_vdetach(struct ieee80211vap *); 69static int hwmp_newstate(struct ieee80211vap *, 70 enum ieee80211_state, int); 71static int hwmp_send_action(struct ieee80211_node *, 72 const uint8_t [IEEE80211_ADDR_LEN], 73 const uint8_t [IEEE80211_ADDR_LEN], 74 uint8_t *, size_t); 75static uint8_t * hwmp_add_meshpreq(uint8_t *, 76 const struct ieee80211_meshpreq_ie *); 77static uint8_t * hwmp_add_meshprep(uint8_t *, 78 const struct ieee80211_meshprep_ie *); 79static uint8_t * hwmp_add_meshperr(uint8_t *, 80 const struct ieee80211_meshperr_ie *); 81static uint8_t * hwmp_add_meshrann(uint8_t *, 82 const struct ieee80211_meshrann_ie *); 83static void hwmp_rootmode_setup(struct ieee80211vap *); 84static void hwmp_rootmode_cb(void *); 85static void hwmp_rootmode_rann_cb(void *); 86static void hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *, 87 const struct ieee80211_frame *, 88 const struct ieee80211_meshpreq_ie *); 89static int hwmp_send_preq(struct ieee80211_node *, 90 const uint8_t [IEEE80211_ADDR_LEN], 91 const uint8_t [IEEE80211_ADDR_LEN], 92 struct ieee80211_meshpreq_ie *, 93 struct timeval *, struct timeval *); 94static void hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *, 95 const struct ieee80211_frame *, 96 const struct ieee80211_meshprep_ie *); 97static int hwmp_send_prep(struct ieee80211_node *, 98 const uint8_t [IEEE80211_ADDR_LEN], 99 const uint8_t [IEEE80211_ADDR_LEN], 100 struct ieee80211_meshprep_ie *); 101static void hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *, 102 const struct ieee80211_frame *, 103 const struct ieee80211_meshperr_ie *); 104static int hwmp_send_perr(struct ieee80211_node *, 105 const uint8_t [IEEE80211_ADDR_LEN], 106 const uint8_t [IEEE80211_ADDR_LEN], 107 struct ieee80211_meshperr_ie *); 108static void hwmp_senderror(struct ieee80211vap *, 109 const uint8_t [IEEE80211_ADDR_LEN], 110 struct ieee80211_mesh_route *, int); 111static void hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *, 112 const struct ieee80211_frame *, 113 const struct ieee80211_meshrann_ie *); 114static int hwmp_send_rann(struct ieee80211_node *, 115 const uint8_t [IEEE80211_ADDR_LEN], 116 const uint8_t [IEEE80211_ADDR_LEN], 117 struct ieee80211_meshrann_ie *); 118static struct ieee80211_node * 119 hwmp_discover(struct ieee80211vap *, 120 const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *); 121static void hwmp_peerdown(struct ieee80211_node *); 122 123static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 }; 124static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 }; 125 126/* unalligned little endian access */ 127#define LE_WRITE_2(p, v) do { \ 128 ((uint8_t *)(p))[0] = (v) & 0xff; \ 129 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 130} while (0) 131#define LE_WRITE_4(p, v) do { \ 132 ((uint8_t *)(p))[0] = (v) & 0xff; \ 133 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 134 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ 135 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ 136} while (0) 137 138 139/* NB: the Target Address set in a Proactive PREQ is the broadcast address. */ 140static const uint8_t broadcastaddr[IEEE80211_ADDR_LEN] = 141 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 142 143typedef uint32_t ieee80211_hwmp_seq; 144#define HWMP_SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0) 145#define HWMP_SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0) 146#define HWMP_SEQ_EQ(a, b) ((int32_t)((a)-(b)) == 0) 147#define HWMP_SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0) 148#define HWMP_SEQ_GEQ(a, b) ((int32_t)((a)-(b)) >= 0) 149 150#define HWMP_SEQ_MAX(a, b) (a > b ? a : b) 151 152/* 153 * Private extension of ieee80211_mesh_route. 154 */ 155struct ieee80211_hwmp_route { 156 ieee80211_hwmp_seq hr_seq; /* last HWMP seq seen from dst*/ 157 ieee80211_hwmp_seq hr_preqid; /* last PREQ ID seen from dst */ 158 ieee80211_hwmp_seq hr_origseq; /* seq. no. on our latest PREQ*/ 159 struct timeval hr_lastpreq; /* last time we sent a PREQ */ 160 struct timeval hr_lastrootconf; /* last sent PREQ root conf */ 161 int hr_preqretries; /* number of discoveries */ 162 int hr_lastdiscovery; /* last discovery in ticks */ 163}; 164struct ieee80211_hwmp_state { 165 ieee80211_hwmp_seq hs_seq; /* next seq to be used */ 166 ieee80211_hwmp_seq hs_preqid; /* next PREQ ID to be used */ 167 int hs_rootmode; /* proactive HWMP */ 168 struct timeval hs_lastperr; /* last time we sent a PERR */ 169 struct callout hs_roottimer; 170 uint8_t hs_maxhops; /* max hop count */ 171}; 172 173static SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0, 174 "IEEE 802.11s HWMP parameters"); 175static int ieee80211_hwmp_targetonly = 0; 176SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLTYPE_INT | CTLFLAG_RW, 177 &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs"); 178static int ieee80211_hwmp_pathtimeout = -1; 179SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, CTLTYPE_INT | CTLFLAG_RW, 180 &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I", 181 "path entry lifetime (ms)"); 182static int ieee80211_hwmp_maxpreq_retries = -1; 183SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, maxpreq_retries, CTLTYPE_INT | CTLFLAG_RW, 184 &ieee80211_hwmp_maxpreq_retries, 0, ieee80211_sysctl_msecs_ticks, "I", 185 "maximum number of preq retries"); 186static int ieee80211_hwmp_net_diameter_traversaltime = -1; 187SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, net_diameter_traversal_time, 188 CTLTYPE_INT | CTLFLAG_RW, &ieee80211_hwmp_net_diameter_traversaltime, 0, 189 ieee80211_sysctl_msecs_ticks, "I", 190 "estimate travelse time across the MBSS (ms)"); 191static int ieee80211_hwmp_roottimeout = -1; 192SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, CTLTYPE_INT | CTLFLAG_RW, 193 &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I", 194 "root PREQ timeout (ms)"); 195static int ieee80211_hwmp_rootint = -1; 196SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, CTLTYPE_INT | CTLFLAG_RW, 197 &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I", 198 "root interval (ms)"); 199static int ieee80211_hwmp_rannint = -1; 200SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, CTLTYPE_INT | CTLFLAG_RW, 201 &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I", 202 "root announcement interval (ms)"); 203static struct timeval ieee80211_hwmp_rootconfint = { 0, 0 }; 204static int ieee80211_hwmp_rootconfint_internal = -1; 205SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootconfint, CTLTYPE_INT | CTLFLAG_RD, 206 &ieee80211_hwmp_rootconfint_internal, 0, ieee80211_sysctl_msecs_ticks, "I", 207 "root confirmation interval (ms) (read-only)"); 208 209#define IEEE80211_HWMP_DEFAULT_MAXHOPS 31 210 211static ieee80211_recv_action_func hwmp_recv_action_meshpath; 212 213static struct ieee80211_mesh_proto_path mesh_proto_hwmp = { 214 .mpp_descr = "HWMP", 215 .mpp_ie = IEEE80211_MESHCONF_PATH_HWMP, 216 .mpp_discover = hwmp_discover, 217 .mpp_peerdown = hwmp_peerdown, 218 .mpp_senderror = hwmp_senderror, 219 .mpp_vattach = hwmp_vattach, 220 .mpp_vdetach = hwmp_vdetach, 221 .mpp_newstate = hwmp_newstate, 222 .mpp_privlen = sizeof(struct ieee80211_hwmp_route), 223}; 224SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact, CTLTYPE_INT | CTLFLAG_RW, 225 &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I", 226 "mesh route inactivity timeout (ms)"); 227 228 229static void 230ieee80211_hwmp_init(void) 231{ 232 /* Default values as per amendment */ 233 ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000); 234 ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000); 235 ieee80211_hwmp_rootint = msecs_to_ticks(2*1000); 236 ieee80211_hwmp_rannint = msecs_to_ticks(1*1000); 237 ieee80211_hwmp_rootconfint_internal = msecs_to_ticks(2*1000); 238 ieee80211_hwmp_maxpreq_retries = 3; 239 /* 240 * (TU): A measurement of time equal to 1024 ��s, 241 * 500 TU is 512 ms. 242 */ 243 ieee80211_hwmp_net_diameter_traversaltime = msecs_to_ticks(512); 244 245 /* 246 * NB: I dont know how to make SYSCTL_PROC that calls ms to ticks 247 * and return a struct timeval... 248 */ 249 ieee80211_hwmp_rootconfint.tv_usec = 250 ieee80211_hwmp_rootconfint_internal * 1000; 251 252 /* 253 * Register action frame handler. 254 */ 255 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESH, 256 IEEE80211_ACTION_MESH_HWMP, hwmp_recv_action_meshpath); 257 258 /* NB: default is 5 secs per spec */ 259 mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000); 260 261 /* 262 * Register HWMP. 263 */ 264 ieee80211_mesh_register_proto_path(&mesh_proto_hwmp); 265} 266SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL); 267 268void 269hwmp_vattach(struct ieee80211vap *vap) 270{ 271 struct ieee80211_hwmp_state *hs; 272 273 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 274 ("not a mesh vap, opmode %d", vap->iv_opmode)); 275 276 hs = malloc(sizeof(struct ieee80211_hwmp_state), M_80211_VAP, 277 M_NOWAIT | M_ZERO); 278 if (hs == NULL) { 279 printf("%s: couldn't alloc HWMP state\n", __func__); 280 return; 281 } 282 hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS; 283 callout_init(&hs->hs_roottimer, CALLOUT_MPSAFE); 284 vap->iv_hwmp = hs; 285} 286 287void 288hwmp_vdetach(struct ieee80211vap *vap) 289{ 290 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 291 292 callout_drain(&hs->hs_roottimer); 293 free(vap->iv_hwmp, M_80211_VAP); 294 vap->iv_hwmp = NULL; 295} 296 297int 298hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg) 299{ 300 enum ieee80211_state nstate = vap->iv_state; 301 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 302 303 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 304 __func__, ieee80211_state_name[ostate], 305 ieee80211_state_name[nstate], arg); 306 307 if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN) 308 callout_drain(&hs->hs_roottimer); 309 if (nstate == IEEE80211_S_RUN) 310 hwmp_rootmode_setup(vap); 311 return 0; 312} 313 314/* 315 * Verify the length of an HWMP PREQ and return the number 316 * of destinations >= 1, if verification fails -1 is returned. 317 */ 318static int 319verify_mesh_preq_len(struct ieee80211vap *vap, 320 const struct ieee80211_frame *wh, const uint8_t *iefrm) 321{ 322 int alloc_sz = -1; 323 int ndest = -1; 324 if (iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE) { 325 /* Originator External Address present */ 326 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ_AE; 327 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET_AE]; 328 } else { 329 /* w/o Originator External Address */ 330 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ; 331 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET]; 332 } 333 alloc_sz += ndest * IEEE80211_MESHPREQ_TRGT_SZ; 334 335 if(iefrm[1] != (alloc_sz)) { 336 IEEE80211_DISCARD(vap, 337 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 338 wh, NULL, "PREQ (AE=%s) with wrong len", 339 iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE ? "1" : "0"); 340 return (-1); 341 } 342 return ndest; 343} 344 345/* 346 * Verify the length of an HWMP PREP and returns 1 on success, 347 * otherwise -1. 348 */ 349static int 350verify_mesh_prep_len(struct ieee80211vap *vap, 351 const struct ieee80211_frame *wh, const uint8_t *iefrm) 352{ 353 int alloc_sz = -1; 354 if (iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE) { 355 if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ_AE) 356 alloc_sz = IEEE80211_MESHPREP_BASE_SZ_AE; 357 } else if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ) 358 alloc_sz = IEEE80211_MESHPREP_BASE_SZ; 359 if(alloc_sz < 0) { 360 IEEE80211_DISCARD(vap, 361 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 362 wh, NULL, "PREP (AE=%s) with wrong len", 363 iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE ? "1" : "0"); 364 return (-1); 365 } 366 return (1); 367} 368 369/* 370 * Verify the length of an HWMP PERR and return the number 371 * of destinations >= 1, if verification fails -1 is returned. 372 */ 373static int 374verify_mesh_perr_len(struct ieee80211vap *vap, 375 const struct ieee80211_frame *wh, const uint8_t *iefrm) 376{ 377 int alloc_sz = -1; 378 const uint8_t *iefrm_t = iefrm; 379 uint8_t ndest = iefrm_t[IEEE80211_MESHPERR_NDEST_OFFSET]; 380 int i; 381 382 if(ndest > IEEE80211_MESHPERR_MAXDEST) { 383 IEEE80211_DISCARD(vap, 384 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 385 wh, NULL, "PERR with wrong number of destionat (>19), %u", 386 ndest); 387 return (-1); 388 } 389 390 iefrm_t += IEEE80211_MESHPERR_NDEST_OFFSET + 1; /* flag is next field */ 391 /* We need to check each destionation flag to know size */ 392 for(i = 0; i<ndest; i++) { 393 if ((*iefrm_t) & IEEE80211_MESHPERR_FLAGS_AE) 394 iefrm_t += IEEE80211_MESHPERR_DEST_SZ_AE; 395 else 396 iefrm_t += IEEE80211_MESHPERR_DEST_SZ; 397 } 398 399 alloc_sz = (iefrm_t - iefrm) - 2; /* action + code */ 400 if(alloc_sz != iefrm[1]) { 401 IEEE80211_DISCARD(vap, 402 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 403 wh, NULL, "%s", "PERR with wrong len"); 404 return (-1); 405 } 406 return ndest; 407} 408 409static int 410hwmp_recv_action_meshpath(struct ieee80211_node *ni, 411 const struct ieee80211_frame *wh, 412 const uint8_t *frm, const uint8_t *efrm) 413{ 414 struct ieee80211vap *vap = ni->ni_vap; 415 struct ieee80211_meshpreq_ie *preq; 416 struct ieee80211_meshprep_ie *prep; 417 struct ieee80211_meshperr_ie *perr; 418 struct ieee80211_meshrann_ie rann; 419 const uint8_t *iefrm = frm + 2; /* action + code */ 420 const uint8_t *iefrm_t = iefrm; /* temporary pointer */ 421 int ndest = -1; 422 int found = 0; 423 424 while (efrm - iefrm > 1) { 425 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0); 426 switch (*iefrm) { 427 case IEEE80211_ELEMID_MESHPREQ: 428 { 429 int i = 0; 430 431 iefrm_t = iefrm; 432 ndest = verify_mesh_preq_len(vap, wh, iefrm_t); 433 if (ndest < 0) { 434 vap->iv_stats.is_rx_mgtdiscard++; 435 break; 436 } 437 preq = malloc(sizeof(*preq) + 438 (ndest - 1) * sizeof(*preq->preq_targets), 439 M_80211_MESH_PREQ, M_NOWAIT | M_ZERO); 440 KASSERT(preq != NULL, ("preq == NULL")); 441 442 preq->preq_ie = *iefrm_t++; 443 preq->preq_len = *iefrm_t++; 444 preq->preq_flags = *iefrm_t++; 445 preq->preq_hopcount = *iefrm_t++; 446 preq->preq_ttl = *iefrm_t++; 447 preq->preq_id = LE_READ_4(iefrm_t); iefrm_t += 4; 448 IEEE80211_ADDR_COPY(preq->preq_origaddr, iefrm_t); 449 iefrm_t += 6; 450 preq->preq_origseq = LE_READ_4(iefrm_t); iefrm_t += 4; 451 /* NB: may have Originator Proxied Address */ 452 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 453 IEEE80211_ADDR_COPY( 454 preq->preq_orig_ext_addr, iefrm_t); 455 iefrm_t += 6; 456 } 457 preq->preq_lifetime = LE_READ_4(iefrm_t); iefrm_t += 4; 458 preq->preq_metric = LE_READ_4(iefrm_t); iefrm_t += 4; 459 preq->preq_tcount = *iefrm_t++; 460 461 for (i = 0; i < preq->preq_tcount; i++) { 462 preq->preq_targets[i].target_flags = *iefrm_t++; 463 IEEE80211_ADDR_COPY( 464 preq->preq_targets[i].target_addr, iefrm_t); 465 iefrm_t += 6; 466 preq->preq_targets[i].target_seq = 467 LE_READ_4(iefrm_t); 468 iefrm_t += 4; 469 } 470 471 hwmp_recv_preq(vap, ni, wh, preq); 472 free(preq, M_80211_MESH_PREQ); 473 found++; 474 break; 475 } 476 case IEEE80211_ELEMID_MESHPREP: 477 { 478 iefrm_t = iefrm; 479 ndest = verify_mesh_prep_len(vap, wh, iefrm_t); 480 if (ndest < 0) { 481 vap->iv_stats.is_rx_mgtdiscard++; 482 break; 483 } 484 prep = malloc(sizeof(*prep), 485 M_80211_MESH_PREP, M_NOWAIT | M_ZERO); 486 KASSERT(prep != NULL, ("prep == NULL")); 487 488 prep->prep_ie = *iefrm_t++; 489 prep->prep_len = *iefrm_t++; 490 prep->prep_flags = *iefrm_t++; 491 prep->prep_hopcount = *iefrm_t++; 492 prep->prep_ttl = *iefrm_t++; 493 IEEE80211_ADDR_COPY(prep->prep_targetaddr, iefrm_t); 494 iefrm_t += 6; 495 prep->prep_targetseq = LE_READ_4(iefrm_t); iefrm_t += 4; 496 /* NB: May have Target Proxied Address */ 497 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 498 IEEE80211_ADDR_COPY( 499 prep->prep_target_ext_addr, iefrm_t); 500 iefrm_t += 6; 501 } 502 prep->prep_lifetime = LE_READ_4(iefrm_t); iefrm_t += 4; 503 prep->prep_metric = LE_READ_4(iefrm_t); iefrm_t += 4; 504 IEEE80211_ADDR_COPY(prep->prep_origaddr, iefrm_t); 505 iefrm_t += 6; 506 prep->prep_origseq = LE_READ_4(iefrm_t); iefrm_t += 4; 507 508 hwmp_recv_prep(vap, ni, wh, prep); 509 free(prep, M_80211_MESH_PREP); 510 found++; 511 break; 512 } 513 case IEEE80211_ELEMID_MESHPERR: 514 { 515 int i = 0; 516 517 iefrm_t = iefrm; 518 ndest = verify_mesh_perr_len(vap, wh, iefrm_t); 519 if (ndest < 0) { 520 vap->iv_stats.is_rx_mgtdiscard++; 521 break; 522 } 523 perr = malloc(sizeof(*perr) + 524 (ndest - 1) * sizeof(*perr->perr_dests), 525 M_80211_MESH_PERR, M_NOWAIT | M_ZERO); 526 KASSERT(perr != NULL, ("perr == NULL")); 527 528 perr->perr_ie = *iefrm_t++; 529 perr->perr_len = *iefrm_t++; 530 perr->perr_ttl = *iefrm_t++; 531 perr->perr_ndests = *iefrm_t++; 532 533 for (i = 0; i<perr->perr_ndests; i++) { 534 perr->perr_dests[i].dest_flags = *iefrm_t++; 535 IEEE80211_ADDR_COPY( 536 perr->perr_dests[i].dest_addr, iefrm_t); 537 iefrm_t += 6; 538 perr->perr_dests[i].dest_seq = LE_READ_4(iefrm_t); 539 iefrm_t += 4; 540 /* NB: May have Target Proxied Address */ 541 if (perr->perr_dests[i].dest_flags & 542 IEEE80211_MESHPERR_FLAGS_AE) { 543 IEEE80211_ADDR_COPY( 544 perr->perr_dests[i].dest_ext_addr, 545 iefrm_t); 546 iefrm_t += 6; 547 } 548 perr->perr_dests[i].dest_rcode = 549 LE_READ_2(iefrm_t); 550 iefrm_t += 2; 551 } 552 553 hwmp_recv_perr(vap, ni, wh, perr); 554 free(perr, M_80211_MESH_PERR); 555 found++; 556 break; 557 } 558 case IEEE80211_ELEMID_MESHRANN: 559 { 560 const struct ieee80211_meshrann_ie *mrann = 561 (const struct ieee80211_meshrann_ie *) iefrm; 562 if (mrann->rann_len != 563 sizeof(struct ieee80211_meshrann_ie) - 2) { 564 IEEE80211_DISCARD(vap, 565 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 566 wh, NULL, "%s", "RAN with wrong len"); 567 vap->iv_stats.is_rx_mgtdiscard++; 568 return 1; 569 } 570 memcpy(&rann, mrann, sizeof(rann)); 571 rann.rann_seq = LE_READ_4(&mrann->rann_seq); 572 rann.rann_interval = LE_READ_4(&mrann->rann_interval); 573 rann.rann_metric = LE_READ_4(&mrann->rann_metric); 574 hwmp_recv_rann(vap, ni, wh, &rann); 575 found++; 576 break; 577 } 578 } 579 iefrm += iefrm[1] + 2; 580 } 581 if (!found) { 582 IEEE80211_DISCARD(vap, 583 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 584 wh, NULL, "%s", "PATH SEL action without IE"); 585 vap->iv_stats.is_rx_mgtdiscard++; 586 } 587 return 0; 588} 589 590static int 591hwmp_send_action(struct ieee80211_node *ni, 592 const uint8_t sa[IEEE80211_ADDR_LEN], 593 const uint8_t da[IEEE80211_ADDR_LEN], 594 uint8_t *ie, size_t len) 595{ 596 struct ieee80211vap *vap = ni->ni_vap; 597 struct ieee80211com *ic = ni->ni_ic; 598 struct ieee80211_bpf_params params; 599 struct mbuf *m; 600 uint8_t *frm; 601 602 if (vap->iv_state == IEEE80211_S_CAC) { 603 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 604 "block %s frame in CAC state", "HWMP action"); 605 vap->iv_stats.is_tx_badstate++; 606 return EIO; /* XXX */ 607 } 608 609 KASSERT(ni != NULL, ("null node")); 610 /* 611 * Hold a reference on the node so it doesn't go away until after 612 * the xmit is complete all the way in the driver. On error we 613 * will remove our reference. 614 */ 615#ifdef IEEE80211_DEBUG_REFCNT 616 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 617 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 618 __func__, __LINE__, 619 ni, ether_sprintf(ni->ni_macaddr), 620 ieee80211_node_refcnt(ni)+1); 621#endif 622 ieee80211_ref_node(ni); 623 624 m = ieee80211_getmgtframe(&frm, 625 ic->ic_headroom + sizeof(struct ieee80211_frame), 626 sizeof(struct ieee80211_action) + len 627 ); 628 if (m == NULL) { 629 ieee80211_free_node(ni); 630 vap->iv_stats.is_tx_nobuf++; 631 return ENOMEM; 632 } 633 *frm++ = IEEE80211_ACTION_CAT_MESH; 634 *frm++ = IEEE80211_ACTION_MESH_HWMP; 635 switch (*ie) { 636 case IEEE80211_ELEMID_MESHPREQ: 637 frm = hwmp_add_meshpreq(frm, 638 (struct ieee80211_meshpreq_ie *)ie); 639 break; 640 case IEEE80211_ELEMID_MESHPREP: 641 frm = hwmp_add_meshprep(frm, 642 (struct ieee80211_meshprep_ie *)ie); 643 break; 644 case IEEE80211_ELEMID_MESHPERR: 645 frm = hwmp_add_meshperr(frm, 646 (struct ieee80211_meshperr_ie *)ie); 647 break; 648 case IEEE80211_ELEMID_MESHRANN: 649 frm = hwmp_add_meshrann(frm, 650 (struct ieee80211_meshrann_ie *)ie); 651 break; 652 } 653 654 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 655 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 656 if (m == NULL) { 657 ieee80211_free_node(ni); 658 vap->iv_stats.is_tx_nobuf++; 659 return ENOMEM; 660 } 661 ieee80211_send_setup(ni, m, 662 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION, 663 IEEE80211_NONQOS_TID, sa, da, sa); 664 665 m->m_flags |= M_ENCAP; /* mark encapsulated */ 666 IEEE80211_NODE_STAT(ni, tx_mgmt); 667 668 memset(¶ms, 0, sizeof(params)); 669 params.ibp_pri = WME_AC_VO; 670 params.ibp_rate0 = ni->ni_txparms->mgmtrate; 671 if (IEEE80211_IS_MULTICAST(da)) 672 params.ibp_try0 = 1; 673 else 674 params.ibp_try0 = ni->ni_txparms->maxretry; 675 params.ibp_power = ni->ni_txpower; 676 return ic->ic_raw_xmit(ni, m, ¶ms); 677} 678 679#define ADDSHORT(frm, v) do { \ 680 frm[0] = (v) & 0xff; \ 681 frm[1] = (v) >> 8; \ 682 frm += 2; \ 683} while (0) 684#define ADDWORD(frm, v) do { \ 685 LE_WRITE_4(frm, v); \ 686 frm += 4; \ 687} while (0) 688/* 689 * Add a Mesh Path Request IE to a frame. 690 */ 691#define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags 692#define PREQ_TADDR(n) preq->preq_targets[n].target_addr 693#define PREQ_TSEQ(n) preq->preq_targets[n].target_seq 694static uint8_t * 695hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq) 696{ 697 int i; 698 699 *frm++ = IEEE80211_ELEMID_MESHPREQ; 700 *frm++ = preq->preq_len; /* len already calculated */ 701 *frm++ = preq->preq_flags; 702 *frm++ = preq->preq_hopcount; 703 *frm++ = preq->preq_ttl; 704 ADDWORD(frm, preq->preq_id); 705 IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6; 706 ADDWORD(frm, preq->preq_origseq); 707 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 708 IEEE80211_ADDR_COPY(frm, preq->preq_orig_ext_addr); 709 frm += 6; 710 } 711 ADDWORD(frm, preq->preq_lifetime); 712 ADDWORD(frm, preq->preq_metric); 713 *frm++ = preq->preq_tcount; 714 for (i = 0; i < preq->preq_tcount; i++) { 715 *frm++ = PREQ_TFLAGS(i); 716 IEEE80211_ADDR_COPY(frm, PREQ_TADDR(i)); 717 frm += 6; 718 ADDWORD(frm, PREQ_TSEQ(i)); 719 } 720 return frm; 721} 722#undef PREQ_TFLAGS 723#undef PREQ_TADDR 724#undef PREQ_TSEQ 725 726/* 727 * Add a Mesh Path Reply IE to a frame. 728 */ 729static uint8_t * 730hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep) 731{ 732 *frm++ = IEEE80211_ELEMID_MESHPREP; 733 *frm++ = prep->prep_len; /* len already calculated */ 734 *frm++ = prep->prep_flags; 735 *frm++ = prep->prep_hopcount; 736 *frm++ = prep->prep_ttl; 737 IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6; 738 ADDWORD(frm, prep->prep_targetseq); 739 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 740 IEEE80211_ADDR_COPY(frm, prep->prep_target_ext_addr); 741 frm += 6; 742 } 743 ADDWORD(frm, prep->prep_lifetime); 744 ADDWORD(frm, prep->prep_metric); 745 IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6; 746 ADDWORD(frm, prep->prep_origseq); 747 return frm; 748} 749 750/* 751 * Add a Mesh Path Error IE to a frame. 752 */ 753#define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags 754#define PERR_DADDR(n) perr->perr_dests[n].dest_addr 755#define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 756#define PERR_EXTADDR(n) perr->perr_dests[n].dest_ext_addr 757#define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode 758static uint8_t * 759hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr) 760{ 761 int i; 762 763 *frm++ = IEEE80211_ELEMID_MESHPERR; 764 *frm++ = perr->perr_len; /* len already calculated */ 765 *frm++ = perr->perr_ttl; 766 *frm++ = perr->perr_ndests; 767 for (i = 0; i < perr->perr_ndests; i++) { 768 *frm++ = PERR_DFLAGS(i); 769 IEEE80211_ADDR_COPY(frm, PERR_DADDR(i)); 770 frm += 6; 771 ADDWORD(frm, PERR_DSEQ(i)); 772 if (PERR_DFLAGS(i) & IEEE80211_MESHPERR_FLAGS_AE) { 773 IEEE80211_ADDR_COPY(frm, PERR_EXTADDR(i)); 774 frm += 6; 775 } 776 ADDSHORT(frm, PERR_DRCODE(i)); 777 } 778 return frm; 779} 780#undef PERR_DFLAGS 781#undef PERR_DADDR 782#undef PERR_DSEQ 783#undef PERR_EXTADDR 784#undef PERR_DRCODE 785 786/* 787 * Add a Root Annoucement IE to a frame. 788 */ 789static uint8_t * 790hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann) 791{ 792 *frm++ = IEEE80211_ELEMID_MESHRANN; 793 *frm++ = rann->rann_len; 794 *frm++ = rann->rann_flags; 795 *frm++ = rann->rann_hopcount; 796 *frm++ = rann->rann_ttl; 797 IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6; 798 ADDWORD(frm, rann->rann_seq); 799 ADDWORD(frm, rann->rann_interval); 800 ADDWORD(frm, rann->rann_metric); 801 return frm; 802} 803 804static void 805hwmp_rootmode_setup(struct ieee80211vap *vap) 806{ 807 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 808 struct ieee80211_mesh_state *ms = vap->iv_mesh; 809 810 switch (hs->hs_rootmode) { 811 case IEEE80211_HWMP_ROOTMODE_DISABLED: 812 callout_drain(&hs->hs_roottimer); 813 ms->ms_flags &= ~IEEE80211_MESHFLAGS_ROOT; 814 break; 815 case IEEE80211_HWMP_ROOTMODE_NORMAL: 816 case IEEE80211_HWMP_ROOTMODE_PROACTIVE: 817 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint, 818 hwmp_rootmode_cb, vap); 819 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT; 820 break; 821 case IEEE80211_HWMP_ROOTMODE_RANN: 822 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint, 823 hwmp_rootmode_rann_cb, vap); 824 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT; 825 break; 826 } 827} 828 829/* 830 * Send a broadcast Path Request to find all nodes on the mesh. We are 831 * called when the vap is configured as a HWMP root node. 832 */ 833#define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 834#define PREQ_TADDR(n) preq.preq_targets[n].target_addr 835#define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 836static void 837hwmp_rootmode_cb(void *arg) 838{ 839 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 840 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 841 struct ieee80211_mesh_state *ms = vap->iv_mesh; 842 struct ieee80211_meshpreq_ie preq; 843 844 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 845 "%s", "send broadcast PREQ"); 846 847 preq.preq_flags = 0; 848 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE) 849 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_GATE; 850 if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE) 851 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP; 852 preq.preq_hopcount = 0; 853 preq.preq_ttl = ms->ms_ttl; 854 preq.preq_id = ++hs->hs_preqid; 855 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 856 preq.preq_origseq = ++hs->hs_seq; 857 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout); 858 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 859 preq.preq_tcount = 1; 860 IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr); 861 PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO | 862 IEEE80211_MESHPREQ_TFLAGS_USN; 863 PREQ_TSEQ(0) = 0; 864 vap->iv_stats.is_hwmp_rootreqs++; 865 hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &preq, 866 NULL, NULL); /* NB: we enforce rate check ourself */ 867 hwmp_rootmode_setup(vap); 868} 869#undef PREQ_TFLAGS 870#undef PREQ_TADDR 871#undef PREQ_TSEQ 872 873/* 874 * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are 875 * called when the vap is configured as a HWMP RANN root node. 876 */ 877static void 878hwmp_rootmode_rann_cb(void *arg) 879{ 880 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 881 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 882 struct ieee80211_mesh_state *ms = vap->iv_mesh; 883 struct ieee80211_meshrann_ie rann; 884 885 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 886 "%s", "send broadcast RANN"); 887 888 rann.rann_flags = 0; 889 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE) 890 rann.rann_flags |= IEEE80211_MESHFLAGS_GATE; 891 rann.rann_hopcount = 0; 892 rann.rann_ttl = ms->ms_ttl; 893 IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr); 894 rann.rann_seq = ++hs->hs_seq; 895 rann.rann_interval = ieee80211_hwmp_rannint; 896 rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 897 898 vap->iv_stats.is_hwmp_rootrann++; 899 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &rann); 900 hwmp_rootmode_setup(vap); 901} 902 903#define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags 904#define PREQ_TADDR(n) preq->preq_targets[n].target_addr 905#define PREQ_TSEQ(n) preq->preq_targets[n].target_seq 906static void 907hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni, 908 const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq) 909{ 910 struct ieee80211_mesh_state *ms = vap->iv_mesh; 911 struct ieee80211_mesh_route *rtorig = NULL; 912 struct ieee80211_mesh_route *rtorig_ext = NULL; 913 struct ieee80211_mesh_route *rttarg = NULL; 914 struct ieee80211_hwmp_route *hrorig = NULL; 915 struct ieee80211_hwmp_route *hrtarg = NULL; 916 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 917 struct ieee80211_meshprep_ie prep; 918 ieee80211_hwmp_seq preqid; /* last seen preqid for orig */ 919 uint32_t metric = 0; 920 921 /* 922 * Ignore PREQs from us. Could happen because someone forward it 923 * back to us. 924 */ 925 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr)) 926 return; 927 928 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 929 "received PREQ, orig %6D, targ(0) %6D", preq->preq_origaddr, ":", 930 PREQ_TADDR(0), ":"); 931 932 /* 933 * Acceptance criteria: (if the PREQ is not for us or not broadcast, 934 * or an external mac address not proxied by us), 935 * AND forwarding is disabled, discard this PREQ. 936 */ 937 rttarg = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0)); 938 if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD) && 939 (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) || 940 !IEEE80211_IS_MULTICAST(PREQ_TADDR(0)) || 941 (rttarg != NULL && 942 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY && 943 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate)))) { 944 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 945 preq->preq_origaddr, NULL, "%s", "not accepting PREQ"); 946 return; 947 } 948 /* 949 * Acceptance criteria: if unicast addressed 950 * AND no valid forwarding for Target of PREQ, discard this PREQ. 951 */ 952 if(rttarg != NULL) 953 hrtarg = IEEE80211_MESH_ROUTE_PRIV(rttarg, 954 struct ieee80211_hwmp_route); 955 /* Address mode: ucast */ 956 if(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AM && 957 rttarg == NULL && 958 !IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) { 959 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 960 preq->preq_origaddr, NULL, 961 "unicast addressed PREQ of unknown target %6D", 962 PREQ_TADDR(0), ":"); 963 return; 964 } 965 966 /* PREQ ACCEPTED */ 967 968 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr); 969 if (rtorig == NULL) { 970 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr); 971 if (rtorig == NULL) { 972 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 973 "unable to add orig path to %6D", 974 preq->preq_origaddr, ":"); 975 vap->iv_stats.is_mesh_rtaddfailed++; 976 return; 977 } 978 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 979 "adding originator %6D", preq->preq_origaddr, ":"); 980 } 981 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route); 982 983 /* record last seen preqid */ 984 preqid = hrorig->hr_preqid; 985 hrorig->hr_preqid = HWMP_SEQ_MAX(hrorig->hr_preqid, preq->preq_id); 986 987 /* Data creation and update of forwarding information 988 * according to Table 11C-8 for originator mesh STA. 989 */ 990 metric = preq->preq_metric + ms->ms_pmetric->mpm_metric(ni); 991 if (HWMP_SEQ_GT(preq->preq_origseq, hrorig->hr_seq) || 992 (HWMP_SEQ_EQ(preq->preq_origseq, hrorig->hr_seq) && 993 metric < rtorig->rt_metric)) { 994 hrorig->hr_seq = preq->preq_origseq; 995 IEEE80211_ADDR_COPY(rtorig->rt_nexthop, wh->i_addr2); 996 rtorig->rt_metric = metric; 997 rtorig->rt_nhops = preq->preq_hopcount + 1; 998 ieee80211_mesh_rt_update(rtorig, preq->preq_lifetime); 999 /* Path to orig is valid now. 1000 * NB: we know it can't be Proxy, and if it is GATE 1001 * it will be marked below. 1002 */ 1003 rtorig->rt_flags = IEEE80211_MESHRT_FLAGS_VALID; 1004 }else if ((hrtarg != NULL && 1005 HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0)) && 1006 ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0)) || 1007 preqid >= preq->preq_id) { 1008 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1009 "discard PREQ from %6D, old seqno %u <= %u," 1010 " or old preqid %u < %u", 1011 preq->preq_origaddr, ":", 1012 preq->preq_origseq, hrorig->hr_seq, 1013 preq->preq_id, preqid); 1014 return; 1015 } 1016 1017 /* 1018 * Forwarding information for transmitter mesh STA 1019 * [OPTIONAL: if metric improved] 1020 */ 1021 1022 /* 1023 * Check if the PREQ is addressed to us. 1024 * or a Proxy currently supplied by us. 1025 */ 1026 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) || 1027 (rttarg != NULL && 1028 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY && 1029 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 1030 /* 1031 * When we are the target we shall update our own HWMP seq 1032 * number with max of (current and preq->seq) + 1 1033 */ 1034 hs->hs_seq = HWMP_SEQ_MAX(hs->hs_seq, PREQ_TSEQ(0)) + 1; 1035 1036 prep.prep_flags = 0; 1037 prep.prep_hopcount = 0; 1038 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr); 1039 if (rttarg != NULL && /* if NULL it means we are the target */ 1040 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1041 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1042 "reply for proxy %6D", rttarg->rt_dest, ":"); 1043 prep.prep_flags |= IEEE80211_MESHPREP_FLAGS_AE; 1044 IEEE80211_ADDR_COPY(prep.prep_target_ext_addr, 1045 rttarg->rt_dest); 1046 /* update proxy seqno to HWMP seqno */ 1047 rttarg->rt_ext_seq = hs->hs_seq; 1048 prep.prep_hopcount = rttarg->rt_nhops; 1049 IEEE80211_ADDR_COPY(prep.prep_targetaddr, rttarg->rt_mesh_gate); 1050 } 1051 /* 1052 * Build and send a PREP frame. 1053 */ 1054 prep.prep_ttl = ms->ms_ttl; 1055 prep.prep_targetseq = hs->hs_seq; 1056 prep.prep_lifetime = preq->preq_lifetime; 1057 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1058 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr); 1059 prep.prep_origseq = preq->preq_origseq; 1060 1061 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1062 "reply to %6D", preq->preq_origaddr, ":"); 1063 hwmp_send_prep(ni, vap->iv_myaddr, wh->i_addr2, &prep); 1064 return; 1065 } 1066 /* we may update our proxy information for the orig external */ 1067 else if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 1068 rtorig_ext = 1069 ieee80211_mesh_rt_find(vap, preq->preq_orig_ext_addr); 1070 if (rtorig_ext == NULL) { 1071 rtorig_ext = ieee80211_mesh_rt_add(vap, 1072 preq->preq_orig_ext_addr); 1073 if (rtorig_ext == NULL) { 1074 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1075 "unable to add orig ext proxy to %6D", 1076 preq->preq_orig_ext_addr, ":"); 1077 vap->iv_stats.is_mesh_rtaddfailed++; 1078 return; 1079 } 1080 IEEE80211_ADDR_COPY(rtorig_ext->rt_mesh_gate, 1081 preq->preq_origaddr); 1082 } 1083 rtorig_ext->rt_ext_seq = preq->preq_origseq; 1084 ieee80211_mesh_rt_update(rtorig_ext, preq->preq_lifetime); 1085 } 1086 /* 1087 * Proactive PREQ: reply with a proactive PREP to the 1088 * root STA if requested. 1089 */ 1090 if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) && 1091 (PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) { 1092 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1093 "root mesh station @ %6D", preq->preq_origaddr, ":"); 1094 1095 /* Check if root is a mesh gate, mark it */ 1096 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_GATE) { 1097 struct ieee80211_mesh_gate_route *gr; 1098 1099 rtorig->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE; 1100 gr = ieee80211_mesh_mark_gate(vap, preq->preq_origaddr, 1101 rtorig); 1102 gr->gr_lastseq = 0; /* NOT GANN */ 1103 } 1104 1105 /* 1106 * Reply with a PREP if we don't have a path to the root 1107 * or if the root sent us a proactive PREQ. 1108 */ 1109 if ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 || 1110 (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) { 1111 prep.prep_flags = 0; 1112 prep.prep_hopcount = 0; 1113 prep.prep_ttl = ms->ms_ttl; 1114 IEEE80211_ADDR_COPY(prep.prep_origaddr, 1115 preq->preq_origaddr); 1116 prep.prep_origseq = preq->preq_origseq; 1117 prep.prep_lifetime = preq->preq_lifetime; 1118 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1119 IEEE80211_ADDR_COPY(prep.prep_targetaddr, 1120 vap->iv_myaddr); 1121 prep.prep_targetseq = ++hs->hs_seq; 1122 hwmp_send_prep(vap->iv_bss, vap->iv_myaddr, 1123 rtorig->rt_nexthop, &prep); 1124 } 1125 } 1126 1127 /* 1128 * Forwarding and Intermediate reply for PREQs with 1 target. 1129 */ 1130 if ((preq->preq_tcount == 1) && (preq->preq_ttl > 1) && 1131 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) { 1132 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */ 1133 1134 memcpy(&ppreq, preq, sizeof(ppreq)); 1135 1136 /* 1137 * We have a valid route to this node. 1138 */ 1139 if (rttarg != NULL && 1140 (rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 1141 /* 1142 * Check if we can send an intermediate Path Reply, 1143 * i.e., Target Only bit is not set and target is not 1144 * the MAC broadcast address. 1145 */ 1146 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO) && 1147 !IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr)) { 1148 struct ieee80211_meshprep_ie prep; 1149 1150 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1151 "intermediate reply for PREQ from %6D", 1152 preq->preq_origaddr, ":"); 1153 prep.prep_flags = 0; 1154 prep.prep_hopcount = rttarg->rt_nhops; 1155 prep.prep_ttl = ms->ms_ttl; 1156 IEEE80211_ADDR_COPY(&prep.prep_targetaddr, 1157 PREQ_TADDR(0)); 1158 prep.prep_targetseq = hrtarg->hr_seq; 1159 prep.prep_lifetime = preq->preq_lifetime; 1160 prep.prep_metric =rttarg->rt_metric; 1161 IEEE80211_ADDR_COPY(&prep.prep_origaddr, 1162 preq->preq_origaddr); 1163 prep.prep_origseq = hrorig->hr_seq; 1164 hwmp_send_prep(ni, vap->iv_myaddr, 1165 rtorig->rt_nexthop, &prep); 1166 1167 /* 1168 * Set TO and unset RF bits because we have 1169 * sent a PREP. 1170 */ 1171 ppreq.preq_targets[0].target_flags |= 1172 IEEE80211_MESHPREQ_TFLAGS_TO; 1173 } 1174 } 1175 1176 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1177 "forward PREQ from %6D", 1178 preq->preq_origaddr, ":"); 1179 ppreq.preq_hopcount += 1; 1180 ppreq.preq_ttl -= 1; 1181 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni); 1182 1183 /* don't do PREQ ratecheck when we propagate */ 1184 hwmp_send_preq(ni, vap->iv_myaddr, broadcastaddr, 1185 &ppreq, NULL, NULL); 1186 } 1187} 1188#undef PREQ_TFLAGS 1189#undef PREQ_TADDR 1190#undef PREQ_TSEQ 1191 1192static int 1193hwmp_send_preq(struct ieee80211_node *ni, 1194 const uint8_t sa[IEEE80211_ADDR_LEN], 1195 const uint8_t da[IEEE80211_ADDR_LEN], 1196 struct ieee80211_meshpreq_ie *preq, 1197 struct timeval *last, struct timeval *minint) 1198{ 1199 1200 /* 1201 * Enforce PREQ interval. 1202 * NB: Proactive ROOT PREQs rate is handled by cb task. 1203 */ 1204 if (last != NULL && minint != NULL) { 1205 if (ratecheck(last, minint) == 0) 1206 return EALREADY; /* XXX: we should postpone */ 1207 getmicrouptime(last); 1208 } 1209 1210 /* 1211 * mesh preq action frame format 1212 * [6] da 1213 * [6] sa 1214 * [6] addr3 = sa 1215 * [1] action 1216 * [1] category 1217 * [tlv] mesh path request 1218 */ 1219 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ; 1220 preq->preq_len = (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE ? 1221 IEEE80211_MESHPREQ_BASE_SZ_AE : IEEE80211_MESHPREQ_BASE_SZ) + 1222 preq->preq_tcount * IEEE80211_MESHPREQ_TRGT_SZ; 1223 return hwmp_send_action(ni, sa, da, (uint8_t *)preq, preq->preq_len+2); 1224} 1225 1226static void 1227hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni, 1228 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep) 1229{ 1230#define IS_PROXY(rt) (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) 1231#define PROXIED_BY_US(rt) \ 1232 (IEEE80211_ADDR_EQ(vap->iv_myaddr, rt->rt_mesh_gate)) 1233 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1234 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1235 struct ieee80211_mesh_route *rt = NULL; 1236 struct ieee80211_mesh_route *rtorig = NULL; 1237 struct ieee80211_mesh_route *rtext = NULL; 1238 struct ieee80211_hwmp_route *hr; 1239 struct ieee80211com *ic = vap->iv_ic; 1240 struct ifnet *ifp = vap->iv_ifp; 1241 struct mbuf *m, *next; 1242 uint32_t metric = 0; 1243 const uint8_t *addr; 1244 int is_encap; 1245 struct ieee80211_node *ni_encap; 1246 1247 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1248 "received PREP, orig %6D, targ %6D", prep->prep_origaddr, ":", 1249 prep->prep_targetaddr, ":"); 1250 1251 /* 1252 * Acceptance criteria: (If the corresponding PREP was not generated 1253 * by us OR not generated by an external mac that is not proxied by us) 1254 * AND forwarding is disabled, discard this PREP. 1255 */ 1256 rtorig = ieee80211_mesh_rt_find(vap, prep->prep_origaddr); 1257 if ((!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) || 1258 (rtorig != NULL && IS_PROXY(rtorig) && !PROXIED_BY_US(rtorig))) && 1259 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)){ 1260 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1261 "discard PREP, orig(%6D) not proxied or generated by us", 1262 prep->prep_origaddr, ":"); 1263 return; 1264 } 1265 1266 /* PREP ACCEPTED */ 1267 1268 /* 1269 * If accepted shall create or update the active forwarding information 1270 * it maintains for the target mesh STA of the PREP (according to the 1271 * rules defined in 13.10.8.4). If the conditions for creating or 1272 * updating the forwarding information have not been met in those 1273 * rules, no further steps are applied to the PREP. 1274 * [OPTIONAL]: update forwarding information to TA if metric improves. 1275 */ 1276 rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr); 1277 if (rt == NULL) { 1278 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr); 1279 if (rt == NULL) { 1280 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1281 "unable to add PREP path to %6D", 1282 prep->prep_targetaddr, ":"); 1283 vap->iv_stats.is_mesh_rtaddfailed++; 1284 return; 1285 } 1286 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1287 "adding target %6D", prep->prep_targetaddr, ":"); 1288 } 1289 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1290 /* update path metric */ 1291 metric = prep->prep_metric + ms->ms_pmetric->mpm_metric(ni); 1292 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 1293 if (HWMP_SEQ_LT(prep->prep_targetseq, hr->hr_seq)) { 1294 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1295 "discard PREP from %6D, old seq no %u < %u", 1296 prep->prep_targetaddr, ":", 1297 prep->prep_targetseq, hr->hr_seq); 1298 return; 1299 } else if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq) && 1300 metric > rt->rt_metric) { 1301 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1302 "discard PREP from %6D, new metric %u > %u", 1303 prep->prep_targetaddr, ":", 1304 metric, rt->rt_metric); 1305 return; 1306 } 1307 } 1308 1309 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1310 "%s path to %6D, hopcount %d:%d metric %d:%d", 1311 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1312 "prefer" : "update", 1313 prep->prep_targetaddr, ":", 1314 rt->rt_nhops, prep->prep_hopcount + 1, 1315 rt->rt_metric, metric); 1316 1317 hr->hr_seq = prep->prep_targetseq; 1318 hr->hr_preqretries = 0; 1319 IEEE80211_ADDR_COPY(rt->rt_nexthop, ni->ni_macaddr); 1320 rt->rt_metric = metric; 1321 rt->rt_nhops = prep->prep_hopcount + 1; 1322 ieee80211_mesh_rt_update(rt, prep->prep_lifetime); 1323 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) { 1324 /* discovery complete */ 1325 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_DISCOVER; 1326 } 1327 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; /* mark valid */ 1328 1329 /* 1330 * If it's NOT for us, propagate the PREP 1331 */ 1332 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) && 1333 prep->prep_ttl > 1 && 1334 prep->prep_hopcount < hs->hs_maxhops) { 1335 struct ieee80211_meshprep_ie pprep; /* propagated PREP */ 1336 /* 1337 * NB: We should already have setup the path to orig 1338 * mesh STA when we propagated PREQ to target mesh STA, 1339 * no PREP is generated without a corresponding PREQ. 1340 * XXX: for now just ignore. 1341 */ 1342 if (rtorig == NULL) { 1343 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1344 "received PREP for an unknown orig(%6D)", 1345 prep->prep_origaddr, ":"); 1346 return; 1347 } 1348 1349 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1350 "propagate PREP from %6D", 1351 prep->prep_targetaddr, ":"); 1352 1353 memcpy(&pprep, prep, sizeof(pprep)); 1354 pprep.prep_hopcount += 1; 1355 pprep.prep_ttl -= 1; 1356 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni); 1357 hwmp_send_prep(ni, vap->iv_myaddr, rtorig->rt_nexthop, &pprep); 1358 1359 /* precursor list for the Target Mesh STA Address is updated */ 1360 } 1361 1362 /* 1363 * Check if we received a PREP w/ AE and store target external address. 1364 * We may store target external address if recevied PREP w/ AE 1365 * and we are not final destination 1366 */ 1367 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 1368 rtext = ieee80211_mesh_rt_find(vap, 1369 prep->prep_target_ext_addr); 1370 if (rtext == NULL) { 1371 rtext = ieee80211_mesh_rt_add(vap, 1372 prep->prep_target_ext_addr); 1373 if (rtext == NULL) { 1374 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1375 "unable to add PREP path to proxy %6D", 1376 prep->prep_targetaddr, ":"); 1377 vap->iv_stats.is_mesh_rtaddfailed++; 1378 return; 1379 } 1380 } 1381 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1382 "%s path to %6D, hopcount %d:%d metric %d:%d", 1383 rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1384 "prefer" : "update", 1385 prep->prep_target_ext_addr, ":", 1386 rtext->rt_nhops, prep->prep_hopcount + 1, 1387 rtext->rt_metric, metric); 1388 1389 rtext->rt_flags = IEEE80211_MESHRT_FLAGS_PROXY | 1390 IEEE80211_MESHRT_FLAGS_VALID; 1391 IEEE80211_ADDR_COPY(rtext->rt_dest, 1392 prep->prep_target_ext_addr); 1393 IEEE80211_ADDR_COPY(rtext->rt_mesh_gate, 1394 prep->prep_targetaddr); 1395 IEEE80211_ADDR_COPY(rtext->rt_nexthop, wh->i_addr2); 1396 rtext->rt_metric = metric; 1397 rtext->rt_lifetime = prep->prep_lifetime; 1398 rtext->rt_nhops = prep->prep_hopcount + 1; 1399 rtext->rt_ext_seq = prep->prep_origseq; /* new proxy seq */ 1400 /* 1401 * XXX: proxy entries have no HWMP priv data, 1402 * nullify them to be sure? 1403 */ 1404 } 1405 /* 1406 * Check for frames queued awaiting path discovery. 1407 * XXX probably can tell exactly and avoid remove call 1408 * NB: hash may have false matches, if so they will get 1409 * stuck back on the stageq because there won't be 1410 * a path. 1411 */ 1412 addr = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ? 1413 prep->prep_target_ext_addr : prep->prep_targetaddr; 1414 m = ieee80211_ageq_remove(&ic->ic_stageq, 1415 (struct ieee80211_node *)(uintptr_t) 1416 ieee80211_mac_hash(ic, addr)); /* either dest or ext_dest */ 1417 for (; m != NULL; m = next) { 1418 is_encap = !! (m->m_flags & M_ENCAP); 1419 ni_encap = (struct ieee80211_node *) m->m_pkthdr.rcvif; 1420 next = m->m_nextpkt; 1421 m->m_nextpkt = NULL; 1422 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1423 "flush queued frame %p len %d", m, m->m_pkthdr.len); 1424 1425 /* 1426 * If the mbuf has M_ENCAP set, ensure we free it. 1427 * Note that after if_transmit() is called, m is invalid. 1428 */ 1429 if (ifp->if_transmit(ifp, m) != 0) { 1430 if (is_encap) 1431 ieee80211_free_node(ni_encap); 1432 } 1433 } 1434#undef IS_PROXY 1435#undef PROXIED_BY_US 1436} 1437 1438static int 1439hwmp_send_prep(struct ieee80211_node *ni, 1440 const uint8_t sa[IEEE80211_ADDR_LEN], 1441 const uint8_t da[IEEE80211_ADDR_LEN], 1442 struct ieee80211_meshprep_ie *prep) 1443{ 1444 /* NB: there's no PREP minimum interval. */ 1445 1446 /* 1447 * mesh prep action frame format 1448 * [6] da 1449 * [6] sa 1450 * [6] addr3 = sa 1451 * [1] action 1452 * [1] category 1453 * [tlv] mesh path reply 1454 */ 1455 prep->prep_ie = IEEE80211_ELEMID_MESHPREP; 1456 prep->prep_len = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ? 1457 IEEE80211_MESHPREP_BASE_SZ_AE : IEEE80211_MESHPREP_BASE_SZ; 1458 return hwmp_send_action(ni, sa, da, (uint8_t *)prep, 1459 prep->prep_len + 2); 1460} 1461 1462#define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1463#define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1464#define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1465#define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1466static void 1467hwmp_peerdown(struct ieee80211_node *ni) 1468{ 1469 struct ieee80211vap *vap = ni->ni_vap; 1470 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1471 struct ieee80211_meshperr_ie perr; 1472 struct ieee80211_mesh_route *rt; 1473 struct ieee80211_hwmp_route *hr; 1474 1475 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr); 1476 if (rt == NULL) 1477 return; 1478 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1479 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1480 "%s", "delete route entry"); 1481 perr.perr_ttl = ms->ms_ttl; 1482 perr.perr_ndests = 1; 1483 PERR_DFLAGS(0) = 0; 1484 if (hr->hr_seq == 0) 1485 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN; 1486 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC; 1487 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest); 1488 PERR_DSEQ(0) = ++hr->hr_seq; 1489 PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH; 1490 /* NB: flush everything passing through peer */ 1491 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr); 1492 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &perr); 1493} 1494#undef PERR_DFLAGS 1495#undef PERR_DADDR 1496#undef PERR_DSEQ 1497#undef PERR_DRCODE 1498 1499#define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags 1500#define PERR_DADDR(n) perr->perr_dests[n].dest_addr 1501#define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 1502#define PERR_DEXTADDR(n) perr->perr_dests[n].dest_ext_addr 1503#define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode 1504static void 1505hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni, 1506 const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr) 1507{ 1508 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1509 struct ieee80211_mesh_route *rt = NULL; 1510 struct ieee80211_mesh_route *rt_ext = NULL; 1511 struct ieee80211_hwmp_route *hr; 1512 struct ieee80211_meshperr_ie *pperr = NULL; 1513 int i, j = 0, forward = 0; 1514 1515 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1516 "received PERR from %6D", wh->i_addr2, ":"); 1517 1518 /* 1519 * if forwarding is true, prepare pperr 1520 */ 1521 if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) { 1522 forward = 1; 1523 pperr = malloc(sizeof(*perr) + 31*sizeof(*perr->perr_dests), 1524 M_80211_MESH_PERR, M_NOWAIT); /* XXX: magic number, 32 err dests */ 1525 } 1526 1527 /* 1528 * Acceptance criteria: check if we have forwarding information 1529 * stored about destination, and that nexthop == TA of this PERR. 1530 * NB: we also build a new PERR to propagate in case we should forward. 1531 */ 1532 for (i = 0; i < perr->perr_ndests; i++) { 1533 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i)); 1534 if (rt == NULL) 1535 continue; 1536 if (!IEEE80211_ADDR_EQ(rt->rt_nexthop, wh->i_addr2)) 1537 continue; 1538 1539 /* found and accepted a PERR ndest element, process it... */ 1540 if (forward) 1541 memcpy(&pperr->perr_dests[j], &perr->perr_dests[i], 1542 sizeof(*perr->perr_dests)); 1543 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1544 switch(PERR_DFLAGS(i)) { 1545 case (IEEE80211_REASON_MESH_PERR_NO_FI): 1546 if (PERR_DSEQ(i) == 0) { 1547 hr->hr_seq++; 1548 if (forward) { 1549 pperr->perr_dests[j].dest_seq = 1550 hr->hr_seq; 1551 } 1552 } else { 1553 hr->hr_seq = PERR_DSEQ(i); 1554 } 1555 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID; 1556 j++; 1557 break; 1558 case (IEEE80211_REASON_MESH_PERR_DEST_UNREACH): 1559 if(HWMP_SEQ_GT(PERR_DSEQ(i), hr->hr_seq)) { 1560 hr->hr_seq = PERR_DSEQ(i); 1561 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID; 1562 j++; 1563 } 1564 break; 1565 case (IEEE80211_REASON_MESH_PERR_NO_PROXY): 1566 rt_ext = ieee80211_mesh_rt_find(vap, PERR_DEXTADDR(i)); 1567 if (rt_ext != NULL) { 1568 rt_ext->rt_flags &= 1569 ~IEEE80211_MESHRT_FLAGS_VALID; 1570 j++; 1571 } 1572 break; 1573 default: 1574 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1575 "PERR, unknown reason code %u\n", PERR_DFLAGS(i)); 1576 goto done; /* XXX: stats?? */ 1577 } 1578 ieee80211_mesh_rt_flush_peer(vap, rt->rt_dest); 1579 KASSERT(j < 32, ("PERR, error ndest >= 32 (%u)", j)); 1580 } 1581 if (j == 0) { 1582 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, "%s", 1583 "PERR not accepted"); 1584 goto done; /* XXX: stats?? */ 1585 } 1586 1587 /* 1588 * Propagate the PERR if we previously found it on our routing table. 1589 */ 1590 if (forward && perr->perr_ttl > 1) { 1591 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1592 "propagate PERR from %6D", wh->i_addr2, ":"); 1593 pperr->perr_ndests = j; 1594 pperr->perr_ttl--; 1595 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, 1596 pperr); 1597 } 1598done: 1599 if (pperr != NULL) 1600 free(pperr, M_80211_MESH_PERR); 1601} 1602#undef PERR_DFLAGS 1603#undef PERR_DADDR 1604#undef PERR_DSEQ 1605#undef PERR_DEXTADDR 1606#undef PERR_DRCODE 1607 1608static int 1609hwmp_send_perr(struct ieee80211_node *ni, 1610 const uint8_t sa[IEEE80211_ADDR_LEN], 1611 const uint8_t da[IEEE80211_ADDR_LEN], 1612 struct ieee80211_meshperr_ie *perr) 1613{ 1614 struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp; 1615 int i; 1616 uint8_t length = 0; 1617 1618 /* 1619 * Enforce PERR interval. 1620 */ 1621 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0) 1622 return EALREADY; 1623 getmicrouptime(&hs->hs_lastperr); 1624 1625 /* 1626 * mesh perr action frame format 1627 * [6] da 1628 * [6] sa 1629 * [6] addr3 = sa 1630 * [1] action 1631 * [1] category 1632 * [tlv] mesh path error 1633 */ 1634 perr->perr_ie = IEEE80211_ELEMID_MESHPERR; 1635 length = IEEE80211_MESHPERR_BASE_SZ; 1636 for (i = 0; i<perr->perr_ndests; i++) { 1637 if (perr->perr_dests[i].dest_flags & 1638 IEEE80211_MESHPERR_FLAGS_AE) { 1639 length += IEEE80211_MESHPERR_DEST_SZ_AE; 1640 continue ; 1641 } 1642 length += IEEE80211_MESHPERR_DEST_SZ; 1643 } 1644 perr->perr_len =length; 1645 return hwmp_send_action(ni, sa, da, (uint8_t *)perr, perr->perr_len+2); 1646} 1647 1648/* 1649 * Called from the rest of the net80211 code (mesh code for example). 1650 * NB: IEEE80211_REASON_MESH_PERR_DEST_UNREACH can be trigger by the fact that 1651 * a mesh STA is unable to forward an MSDU/MMPDU to a next-hop mesh STA. 1652 */ 1653#define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1654#define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1655#define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1656#define PERR_DEXTADDR(n) perr.perr_dests[n].dest_ext_addr 1657#define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1658static void 1659hwmp_senderror(struct ieee80211vap *vap, 1660 const uint8_t addr[IEEE80211_ADDR_LEN], 1661 struct ieee80211_mesh_route *rt, int rcode) 1662{ 1663 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1664 struct ieee80211_hwmp_route *hr = NULL; 1665 struct ieee80211_meshperr_ie perr; 1666 1667 if (rt != NULL) 1668 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1669 struct ieee80211_hwmp_route); 1670 1671 perr.perr_ndests = 1; 1672 perr.perr_ttl = ms->ms_ttl; 1673 PERR_DFLAGS(0) = 0; 1674 PERR_DRCODE(0) = rcode; 1675 1676 switch (rcode) { 1677 case IEEE80211_REASON_MESH_PERR_NO_FI: 1678 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr); 1679 PERR_DSEQ(0) = 0; /* reserved */ 1680 break; 1681 case IEEE80211_REASON_MESH_PERR_NO_PROXY: 1682 KASSERT(rt != NULL, ("no proxy info for sending PERR")); 1683 KASSERT(rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY, 1684 ("route is not marked proxy")); 1685 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_FLAGS_AE; 1686 IEEE80211_ADDR_COPY(PERR_DADDR(0), vap->iv_myaddr); 1687 PERR_DSEQ(0) = rt->rt_ext_seq; 1688 IEEE80211_ADDR_COPY(PERR_DEXTADDR(0), addr); 1689 break; 1690 case IEEE80211_REASON_MESH_PERR_DEST_UNREACH: 1691 KASSERT(rt != NULL, ("no route info for sending PERR")); 1692 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr); 1693 PERR_DSEQ(0) = hr->hr_seq; 1694 break; 1695 default: 1696 KASSERT(0, ("unknown reason code for HWMP PERR (%u)", rcode)); 1697 } 1698 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &perr); 1699} 1700#undef PERR_DFLAGS 1701#undef PEER_DADDR 1702#undef PERR_DSEQ 1703#undef PERR_DEXTADDR 1704#undef PERR_DRCODE 1705 1706static void 1707hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni, 1708 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann) 1709{ 1710 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1711 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1712 struct ieee80211_mesh_route *rt = NULL; 1713 struct ieee80211_hwmp_route *hr; 1714 struct ieee80211_meshpreq_ie preq; 1715 struct ieee80211_meshrann_ie prann; 1716 uint32_t metric = 0; 1717 1718 if (IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr)) 1719 return; 1720 1721 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr); 1722 if (rt != NULL && rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) { 1723 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1724 1725 /* Acceptance criteria: if RANN.seq < stored seq, discard RANN */ 1726 if (HWMP_SEQ_LT(rann->rann_seq, hr->hr_seq)) { 1727 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1728 "RANN seq %u < %u", rann->rann_seq, hr->hr_seq); 1729 return; 1730 } 1731 1732 /* Acceptance criteria: if RANN.seq == stored seq AND 1733 * RANN.metric > stored metric, discard RANN */ 1734 if (HWMP_SEQ_EQ(rann->rann_seq, hr->hr_seq) && 1735 rann->rann_metric > rt->rt_metric) { 1736 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1737 "RANN metric %u > %u", rann->rann_metric, rt->rt_metric); 1738 return; 1739 } 1740 } 1741 1742 /* RANN ACCEPTED */ 1743 1744 ieee80211_hwmp_rannint = rann->rann_interval; /* XXX: mtx lock? */ 1745 metric = rann->rann_metric + ms->ms_pmetric->mpm_metric(ni); 1746 1747 if (rt == NULL) { 1748 rt = ieee80211_mesh_rt_add(vap, rann->rann_addr); 1749 if (rt == NULL) { 1750 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1751 "unable to add mac for RANN root %6D", 1752 rann->rann_addr, ":"); 1753 vap->iv_stats.is_mesh_rtaddfailed++; 1754 return; 1755 } 1756 } 1757 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1758 /* Check if root is a mesh gate, mark it */ 1759 if (rann->rann_flags & IEEE80211_MESHRANN_FLAGS_GATE) { 1760 struct ieee80211_mesh_gate_route *gr; 1761 1762 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE; 1763 gr = ieee80211_mesh_mark_gate(vap, rann->rann_addr, 1764 rt); 1765 gr->gr_lastseq = 0; /* NOT GANN */ 1766 } 1767 /* discovery timeout */ 1768 ieee80211_mesh_rt_update(rt, 1769 ticks_to_msecs(ieee80211_hwmp_roottimeout)); 1770 1771 preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM; 1772 preq.preq_hopcount = 0; 1773 preq.preq_ttl = ms->ms_ttl; 1774 preq.preq_id = 0; /* reserved */ 1775 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1776 preq.preq_origseq = ++hs->hs_seq; 1777 preq.preq_lifetime = ieee80211_hwmp_roottimeout; 1778 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1779 preq.preq_tcount = 1; 1780 preq.preq_targets[0].target_flags = IEEE80211_MESHPREQ_TFLAGS_TO; 1781 /* NB: IEEE80211_MESHPREQ_TFLAGS_USN = 0 implicitly implied */ 1782 IEEE80211_ADDR_COPY(preq.preq_targets[0].target_addr, rann->rann_addr); 1783 preq.preq_targets[0].target_seq = rann->rann_seq; 1784 /* XXX: if rootconfint have not passed, we built this preq in vain */ 1785 hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, wh->i_addr2, &preq, 1786 &hr->hr_lastrootconf, &ieee80211_hwmp_rootconfint); 1787 1788 /* propagate a RANN */ 1789 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1790 rann->rann_ttl > 1 && 1791 ms->ms_flags & IEEE80211_MESHFLAGS_FWD) { 1792 hr->hr_seq = rann->rann_seq; 1793 memcpy(&prann, rann, sizeof(prann)); 1794 prann.rann_hopcount += 1; 1795 prann.rann_ttl -= 1; 1796 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni); 1797 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, 1798 broadcastaddr, &prann); 1799 } 1800} 1801 1802static int 1803hwmp_send_rann(struct ieee80211_node *ni, 1804 const uint8_t sa[IEEE80211_ADDR_LEN], 1805 const uint8_t da[IEEE80211_ADDR_LEN], 1806 struct ieee80211_meshrann_ie *rann) 1807{ 1808 /* 1809 * mesh rann action frame format 1810 * [6] da 1811 * [6] sa 1812 * [6] addr3 = sa 1813 * [1] action 1814 * [1] category 1815 * [tlv] root annoucement 1816 */ 1817 rann->rann_ie = IEEE80211_ELEMID_MESHRANN; 1818 rann->rann_len = IEEE80211_MESHRANN_BASE_SZ; 1819 return hwmp_send_action(ni, sa, da, (uint8_t *)rann, 1820 rann->rann_len + 2); 1821} 1822 1823#define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 1824#define PREQ_TADDR(n) preq.preq_targets[n].target_addr 1825#define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 1826static void 1827hwmp_rediscover_cb(void *arg) 1828{ 1829 struct ieee80211_mesh_route *rt = arg; 1830 struct ieee80211vap *vap = rt->rt_vap; 1831 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1832 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1833 struct ieee80211_hwmp_route *hr; 1834 struct ieee80211_meshpreq_ie preq; /* Optimize: storing first preq? */ 1835 1836 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) 1837 return ; /* nothing to do */ 1838 1839 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1840 if (hr->hr_preqretries >= 1841 ieee80211_hwmp_maxpreq_retries) { 1842 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, 1843 rt->rt_dest, "%s", 1844 "max number of discovery, send queued frames to GATE"); 1845 ieee80211_mesh_forward_to_gates(vap, rt); 1846 vap->iv_stats.is_mesh_fwd_nopath++; 1847 return ; /* XXX: flush queue? */ 1848 } 1849 1850 hr->hr_preqretries++; 1851 1852 1853 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, rt->rt_dest, 1854 "start path rediscovery , target seq %u", hr->hr_seq); 1855 /* 1856 * Try to discover the path for this node. 1857 * Group addressed PREQ Case A 1858 */ 1859 preq.preq_flags = 0; 1860 preq.preq_hopcount = 0; 1861 preq.preq_ttl = ms->ms_ttl; 1862 preq.preq_id = ++hs->hs_preqid; 1863 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1864 preq.preq_origseq = hr->hr_origseq; 1865 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_pathtimeout); 1866 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1867 preq.preq_tcount = 1; 1868 IEEE80211_ADDR_COPY(PREQ_TADDR(0), rt->rt_dest); 1869 PREQ_TFLAGS(0) = 0; 1870 if (ieee80211_hwmp_targetonly) 1871 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 1872 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 1873 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */ 1874 /* XXX check return value */ 1875 hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, 1876 broadcastaddr, &preq, &hr->hr_lastpreq, 1877 &ieee80211_hwmp_preqminint); 1878 callout_reset(&rt->rt_discovery, 1879 ieee80211_hwmp_net_diameter_traversaltime * 2, 1880 hwmp_rediscover_cb, rt); 1881} 1882 1883static struct ieee80211_node * 1884hwmp_discover(struct ieee80211vap *vap, 1885 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m) 1886{ 1887 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1888 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1889 struct ieee80211_mesh_route *rt = NULL; 1890 struct ieee80211_hwmp_route *hr; 1891 struct ieee80211_meshpreq_ie preq; 1892 struct ieee80211_node *ni; 1893 int sendpreq = 0; 1894 1895 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1896 ("not a mesh vap, opmode %d", vap->iv_opmode)); 1897 1898 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest), 1899 ("%s: discovering self!", __func__)); 1900 1901 ni = NULL; 1902 if (!IEEE80211_IS_MULTICAST(dest)) { 1903 rt = ieee80211_mesh_rt_find(vap, dest); 1904 if (rt == NULL) { 1905 rt = ieee80211_mesh_rt_add(vap, dest); 1906 if (rt == NULL) { 1907 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 1908 ni, "unable to add discovery path to %6D", 1909 dest, ":"); 1910 vap->iv_stats.is_mesh_rtaddfailed++; 1911 goto done; 1912 } 1913 } 1914 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1915 struct ieee80211_hwmp_route); 1916 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) { 1917 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1918 "%s", "already discovering queue frame until path found"); 1919 sendpreq = 1; 1920 goto done; 1921 } 1922 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) { 1923 if (hr->hr_lastdiscovery != 0 && 1924 (ticks - hr->hr_lastdiscovery < 1925 (ieee80211_hwmp_net_diameter_traversaltime * 2))) { 1926 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 1927 dest, NULL, "%s", 1928 "too frequent discovery requeust"); 1929 sendpreq = 1; 1930 goto done; 1931 } 1932 hr->hr_lastdiscovery = ticks; 1933 if (hr->hr_preqretries >= 1934 ieee80211_hwmp_maxpreq_retries) { 1935 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 1936 dest, NULL, "%s", 1937 "no valid path , max number of discovery"); 1938 vap->iv_stats.is_mesh_fwd_nopath++; 1939 goto done; 1940 } 1941 rt->rt_flags = IEEE80211_MESHRT_FLAGS_DISCOVER; 1942 hr->hr_preqretries++; 1943 if (hr->hr_origseq == 0) 1944 hr->hr_origseq = ++hs->hs_seq; 1945 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1946 sendpreq = 1; 1947 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1948 "start path discovery (src %s), target seq %u", 1949 m == NULL ? "<none>" : ether_sprintf( 1950 mtod(m, struct ether_header *)->ether_shost), 1951 hr->hr_seq); 1952 /* 1953 * Try to discover the path for this node. 1954 * Group addressed PREQ Case A 1955 */ 1956 preq.preq_flags = 0; 1957 preq.preq_hopcount = 0; 1958 preq.preq_ttl = ms->ms_ttl; 1959 preq.preq_id = ++hs->hs_preqid; 1960 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1961 preq.preq_origseq = hr->hr_origseq; 1962 preq.preq_lifetime = 1963 ticks_to_msecs(ieee80211_hwmp_pathtimeout); 1964 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1965 preq.preq_tcount = 1; 1966 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest); 1967 PREQ_TFLAGS(0) = 0; 1968 if (ieee80211_hwmp_targetonly) 1969 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 1970 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 1971 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */ 1972 /* XXX check return value */ 1973 hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, 1974 broadcastaddr, &preq, &hr->hr_lastpreq, 1975 &ieee80211_hwmp_preqminint); 1976 callout_reset(&rt->rt_discovery, 1977 ieee80211_hwmp_net_diameter_traversaltime * 2, 1978 hwmp_rediscover_cb, rt); 1979 } 1980 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) 1981 ni = ieee80211_find_txnode(vap, rt->rt_nexthop); 1982 } else { 1983 ni = ieee80211_find_txnode(vap, dest); 1984 /* NB: if null then we leak mbuf */ 1985 KASSERT(ni != NULL, ("leak mcast frame")); 1986 return ni; 1987 } 1988done: 1989 if (ni == NULL && m != NULL) { 1990 if (sendpreq) { 1991 struct ieee80211com *ic = vap->iv_ic; 1992 /* 1993 * Queue packet for transmit when path discovery 1994 * completes. If discovery never completes the 1995 * frame will be flushed by way of the aging timer. 1996 */ 1997 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1998 "%s", "queue frame until path found"); 1999 m->m_pkthdr.rcvif = (void *)(uintptr_t) 2000 ieee80211_mac_hash(ic, dest); 2001 /* XXX age chosen randomly */ 2002 ieee80211_ageq_append(&ic->ic_stageq, m, 2003 IEEE80211_INACT_WAIT); 2004 } else { 2005 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 2006 dest, NULL, "%s", "no valid path to this node"); 2007 m_freem(m); 2008 } 2009 } 2010 return ni; 2011} 2012#undef PREQ_TFLAGS 2013#undef PREQ_TADDR 2014#undef PREQ_TSEQ 2015 2016static int 2017hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 2018{ 2019 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 2020 int error; 2021 2022 if (vap->iv_opmode != IEEE80211_M_MBSS) 2023 return ENOSYS; 2024 error = 0; 2025 switch (ireq->i_type) { 2026 case IEEE80211_IOC_HWMP_ROOTMODE: 2027 ireq->i_val = hs->hs_rootmode; 2028 break; 2029 case IEEE80211_IOC_HWMP_MAXHOPS: 2030 ireq->i_val = hs->hs_maxhops; 2031 break; 2032 default: 2033 return ENOSYS; 2034 } 2035 return error; 2036} 2037IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211); 2038 2039static int 2040hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 2041{ 2042 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 2043 int error; 2044 2045 if (vap->iv_opmode != IEEE80211_M_MBSS) 2046 return ENOSYS; 2047 error = 0; 2048 switch (ireq->i_type) { 2049 case IEEE80211_IOC_HWMP_ROOTMODE: 2050 if (ireq->i_val < 0 || ireq->i_val > 3) 2051 return EINVAL; 2052 hs->hs_rootmode = ireq->i_val; 2053 hwmp_rootmode_setup(vap); 2054 break; 2055 case IEEE80211_IOC_HWMP_MAXHOPS: 2056 if (ireq->i_val <= 0 || ireq->i_val > 255) 2057 return EINVAL; 2058 hs->hs_maxhops = ireq->i_val; 2059 break; 2060 default: 2061 return ENOSYS; 2062 } 2063 return error; 2064} 2065IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211); 2066