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 struct ieee80211_meshprep_ie prep; 948 ieee80211_hwmp_seq preqid; /* last seen preqid for orig */ 949 uint32_t metric = 0; 950 951 /* 952 * Ignore PREQs from us. Could happen because someone forward it 953 * back to us. 954 */ 955 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr)) 956 return; 957 958 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 959 "received PREQ, orig %6D, targ(0) %6D", preq->preq_origaddr, ":", 960 PREQ_TADDR(0), ":"); 961 962 /* 963 * Acceptance criteria: (if the PREQ is not for us or not broadcast, 964 * or an external mac address not proxied by us), 965 * AND forwarding is disabled, discard this PREQ. 966 */ 967 rttarg = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0)); 968 if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD) && 969 (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) || 970 !IEEE80211_IS_MULTICAST(PREQ_TADDR(0)) || 971 (rttarg != NULL && 972 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY && 973 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate)))) { 974 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 975 preq->preq_origaddr, NULL, "%s", "not accepting PREQ"); 976 return; 977 } 978 /* 979 * Acceptance criteria: if unicast addressed 980 * AND no valid forwarding for Target of PREQ, discard this PREQ. 981 */ 982 if(rttarg != NULL) 983 hrtarg = IEEE80211_MESH_ROUTE_PRIV(rttarg, 984 struct ieee80211_hwmp_route); 985 /* Address mode: ucast */ 986 if(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AM && 987 rttarg == NULL && 988 !IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) { 989 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 990 preq->preq_origaddr, NULL, 991 "unicast addressed PREQ of unknown target %6D", 992 PREQ_TADDR(0), ":"); 993 return; 994 } 995 996 /* PREQ ACCEPTED */ 997 998 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr); 999 if (rtorig == NULL) { 1000 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr); 1001 if (rtorig == NULL) { 1002 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1003 "unable to add orig path to %6D", 1004 preq->preq_origaddr, ":"); 1005 vap->iv_stats.is_mesh_rtaddfailed++; 1006 return; 1007 } 1008 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1009 "adding originator %6D", preq->preq_origaddr, ":"); 1010 } 1011 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route); 1012 1013 /* record last seen preqid */ 1014 preqid = hrorig->hr_preqid; 1015 hrorig->hr_preqid = HWMP_SEQ_MAX(hrorig->hr_preqid, preq->preq_id); 1016 1017 /* Data creation and update of forwarding information 1018 * according to Table 11C-8 for originator mesh STA. 1019 */ 1020 metric = preq->preq_metric + ms->ms_pmetric->mpm_metric(ni); 1021 if (HWMP_SEQ_GT(preq->preq_origseq, hrorig->hr_seq) || 1022 (HWMP_SEQ_EQ(preq->preq_origseq, hrorig->hr_seq) && 1023 metric < rtorig->rt_metric)) { 1024 hrorig->hr_seq = preq->preq_origseq; 1025 IEEE80211_ADDR_COPY(rtorig->rt_nexthop, wh->i_addr2); 1026 rtorig->rt_metric = metric; 1027 rtorig->rt_nhops = preq->preq_hopcount + 1; 1028 ieee80211_mesh_rt_update(rtorig, preq->preq_lifetime); 1029 /* Path to orig is valid now. 1030 * NB: we know it can't be Proxy, and if it is GATE 1031 * it will be marked below. 1032 */ 1033 rtorig->rt_flags = IEEE80211_MESHRT_FLAGS_VALID; 1034 } else if ((hrtarg != NULL && 1035 !HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0))) || 1036 (rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1037 preqid >= preq->preq_id)) { 1038 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1039 "discard PREQ from %6D, old seqno %u <= %u," 1040 " or old preqid %u < %u", 1041 preq->preq_origaddr, ":", 1042 preq->preq_origseq, hrorig->hr_seq, 1043 preq->preq_id, preqid); 1044 return; 1045 } 1046 1047 /* Update forwarding information to TA if metric improves. */ 1048 hwmp_update_transmitter(vap, ni, "PREQ"); 1049 1050 /* 1051 * Check if the PREQ is addressed to us. 1052 * or a Proxy currently gated by us. 1053 */ 1054 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) || 1055 (ms->ms_flags & IEEE80211_MESHFLAGS_GATE && 1056 rttarg != NULL && 1057 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate) && 1058 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY && 1059 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 1060 /* 1061 * When we are the target we shall update our own HWMP seq 1062 * number with max of (current and preq->seq) + 1 1063 */ 1064 hs->hs_seq = HWMP_SEQ_MAX(hs->hs_seq, PREQ_TSEQ(0)) + 1; 1065 1066 prep.prep_flags = 0; 1067 prep.prep_hopcount = 0; 1068 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1069 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr); 1070 if (rttarg != NULL && /* if NULL it means we are the target */ 1071 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1072 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1073 "reply for proxy %6D", rttarg->rt_dest, ":"); 1074 prep.prep_flags |= IEEE80211_MESHPREP_FLAGS_AE; 1075 IEEE80211_ADDR_COPY(prep.prep_target_ext_addr, 1076 rttarg->rt_dest); 1077 /* update proxy seqno to HWMP seqno */ 1078 rttarg->rt_ext_seq = hs->hs_seq; 1079 prep.prep_hopcount = rttarg->rt_nhops; 1080 prep.prep_metric = rttarg->rt_metric; 1081 IEEE80211_ADDR_COPY(prep.prep_targetaddr, rttarg->rt_mesh_gate); 1082 } 1083 /* 1084 * Build and send a PREP frame. 1085 */ 1086 prep.prep_ttl = ms->ms_ttl; 1087 prep.prep_targetseq = hs->hs_seq; 1088 prep.prep_lifetime = preq->preq_lifetime; 1089 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr); 1090 prep.prep_origseq = preq->preq_origseq; 1091 1092 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1093 "reply to %6D", preq->preq_origaddr, ":"); 1094 hwmp_send_prep(vap, wh->i_addr2, &prep); 1095 return; 1096 } 1097 /* we may update our proxy information for the orig external */ 1098 else if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 1099 rtorig_ext = 1100 ieee80211_mesh_rt_find(vap, preq->preq_orig_ext_addr); 1101 if (rtorig_ext == NULL) { 1102 rtorig_ext = ieee80211_mesh_rt_add(vap, 1103 preq->preq_orig_ext_addr); 1104 if (rtorig_ext == NULL) { 1105 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1106 "unable to add orig ext proxy to %6D", 1107 preq->preq_orig_ext_addr, ":"); 1108 vap->iv_stats.is_mesh_rtaddfailed++; 1109 return; 1110 } 1111 IEEE80211_ADDR_COPY(rtorig_ext->rt_mesh_gate, 1112 preq->preq_origaddr); 1113 } 1114 rtorig_ext->rt_ext_seq = preq->preq_origseq; 1115 ieee80211_mesh_rt_update(rtorig_ext, preq->preq_lifetime); 1116 } 1117 /* 1118 * Proactive PREQ: reply with a proactive PREP to the 1119 * root STA if requested. 1120 */ 1121 if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) && 1122 (PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) { 1123 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1124 "root mesh station @ %6D", preq->preq_origaddr, ":"); 1125 1126 /* Check if root is a mesh gate, mark it */ 1127 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_GATE) { 1128 struct ieee80211_mesh_gate_route *gr; 1129 1130 rtorig->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE; 1131 gr = ieee80211_mesh_mark_gate(vap, preq->preq_origaddr, 1132 rtorig); 1133 gr->gr_lastseq = 0; /* NOT GANN */ 1134 } 1135 1136 /* 1137 * Reply with a PREP if we don't have a path to the root 1138 * or if the root sent us a proactive PREQ. 1139 */ 1140 if ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 || 1141 (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) { 1142 prep.prep_flags = 0; 1143 prep.prep_hopcount = 0; 1144 prep.prep_ttl = ms->ms_ttl; 1145 IEEE80211_ADDR_COPY(prep.prep_origaddr, 1146 preq->preq_origaddr); 1147 prep.prep_origseq = preq->preq_origseq; 1148 prep.prep_lifetime = preq->preq_lifetime; 1149 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1150 IEEE80211_ADDR_COPY(prep.prep_targetaddr, 1151 vap->iv_myaddr); 1152 prep.prep_targetseq = ++hs->hs_seq; 1153 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep); 1154 } 1155 } 1156 1157 /* 1158 * Forwarding and Intermediate reply for PREQs with 1 target. 1159 */ 1160 if ((preq->preq_tcount == 1) && (preq->preq_ttl > 1) && 1161 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) { 1162 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */ 1163 1164 memcpy(&ppreq, preq, sizeof(ppreq)); 1165 1166 /* 1167 * We have a valid route to this node. 1168 * NB: if target is proxy dont reply. 1169 */ 1170 if (rttarg != NULL && 1171 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1172 !(rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)) { 1173 /* 1174 * Check if we can send an intermediate Path Reply, 1175 * i.e., Target Only bit is not set and target is not 1176 * the MAC broadcast address. 1177 */ 1178 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO) && 1179 !IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr)) { 1180 struct ieee80211_meshprep_ie prep; 1181 1182 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1183 "intermediate reply for PREQ from %6D", 1184 preq->preq_origaddr, ":"); 1185 prep.prep_flags = 0; 1186 prep.prep_hopcount = rttarg->rt_nhops; 1187 prep.prep_ttl = ms->ms_ttl; 1188 IEEE80211_ADDR_COPY(&prep.prep_targetaddr, 1189 PREQ_TADDR(0)); 1190 prep.prep_targetseq = hrtarg->hr_seq; 1191 prep.prep_lifetime = preq->preq_lifetime; 1192 prep.prep_metric =rttarg->rt_metric; 1193 IEEE80211_ADDR_COPY(&prep.prep_origaddr, 1194 preq->preq_origaddr); 1195 prep.prep_origseq = hrorig->hr_seq; 1196 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep); 1197 1198 /* 1199 * Set TO and unset RF bits because we have 1200 * sent a PREP. 1201 */ 1202 ppreq.preq_targets[0].target_flags |= 1203 IEEE80211_MESHPREQ_TFLAGS_TO; 1204 } 1205 } 1206 1207 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1208 "forward PREQ from %6D", 1209 preq->preq_origaddr, ":"); 1210 ppreq.preq_hopcount += 1; 1211 ppreq.preq_ttl -= 1; 1212 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni); 1213 1214 /* don't do PREQ ratecheck when we propagate */ 1215 hwmp_send_preq(vap, broadcastaddr, &ppreq, NULL, NULL); 1216 } 1217 } 1218 #undef PREQ_TFLAGS 1219 #undef PREQ_TADDR 1220 #undef PREQ_TSEQ 1221 1222 static int 1223 hwmp_send_preq(struct ieee80211vap *vap, 1224 const uint8_t da[IEEE80211_ADDR_LEN], 1225 struct ieee80211_meshpreq_ie *preq, 1226 struct timeval *last, struct timeval *minint) 1227 { 1228 1229 /* 1230 * Enforce PREQ interval. 1231 * NB: Proactive ROOT PREQs rate is handled by cb task. 1232 */ 1233 if (last != NULL && minint != NULL) { 1234 if (ratecheck(last, minint) == 0) 1235 return EALREADY; /* XXX: we should postpone */ 1236 getmicrouptime(last); 1237 } 1238 1239 /* 1240 * mesh preq action frame format 1241 * [6] da 1242 * [6] sa 1243 * [6] addr3 = sa 1244 * [1] action 1245 * [1] category 1246 * [tlv] mesh path request 1247 */ 1248 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ; 1249 preq->preq_len = (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE ? 1250 IEEE80211_MESHPREQ_BASE_SZ_AE : IEEE80211_MESHPREQ_BASE_SZ) + 1251 preq->preq_tcount * IEEE80211_MESHPREQ_TRGT_SZ; 1252 return hwmp_send_action(vap, da, (uint8_t *)preq, preq->preq_len+2); 1253 } 1254 1255 static void 1256 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni, 1257 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep) 1258 { 1259 #define IS_PROXY(rt) (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) 1260 #define PROXIED_BY_US(rt) \ 1261 (IEEE80211_ADDR_EQ(vap->iv_myaddr, rt->rt_mesh_gate)) 1262 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1263 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1264 struct ieee80211_mesh_route *rt = NULL; 1265 struct ieee80211_mesh_route *rtorig = NULL; 1266 struct ieee80211_mesh_route *rtext = NULL; 1267 struct ieee80211_hwmp_route *hr; 1268 struct ieee80211com *ic = vap->iv_ic; 1269 struct mbuf *m, *next; 1270 uint32_t metric = 0; 1271 const uint8_t *addr; 1272 1273 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1274 "received PREP, orig %6D, targ %6D", prep->prep_origaddr, ":", 1275 prep->prep_targetaddr, ":"); 1276 1277 /* 1278 * Acceptance criteria: (If the corresponding PREP was not generated 1279 * by us OR not generated by an external mac that is not proxied by us) 1280 * AND forwarding is disabled, discard this PREP. 1281 */ 1282 rtorig = ieee80211_mesh_rt_find(vap, prep->prep_origaddr); 1283 if ((!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) || 1284 (rtorig != NULL && IS_PROXY(rtorig) && !PROXIED_BY_US(rtorig))) && 1285 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)){ 1286 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1287 "discard PREP, orig(%6D) not proxied or generated by us", 1288 prep->prep_origaddr, ":"); 1289 return; 1290 } 1291 1292 /* PREP ACCEPTED */ 1293 1294 /* 1295 * If accepted shall create or update the active forwarding information 1296 * it maintains for the target mesh STA of the PREP (according to the 1297 * rules defined in 13.10.8.4). If the conditions for creating or 1298 * updating the forwarding information have not been met in those 1299 * rules, no further steps are applied to the PREP. 1300 */ 1301 rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr); 1302 if (rt == NULL) { 1303 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr); 1304 if (rt == NULL) { 1305 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1306 "unable to add PREP path to %6D", 1307 prep->prep_targetaddr, ":"); 1308 vap->iv_stats.is_mesh_rtaddfailed++; 1309 return; 1310 } 1311 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1312 "adding target %6D", prep->prep_targetaddr, ":"); 1313 } 1314 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1315 /* update path metric */ 1316 metric = prep->prep_metric + ms->ms_pmetric->mpm_metric(ni); 1317 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 1318 if (HWMP_SEQ_LT(prep->prep_targetseq, hr->hr_seq)) { 1319 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1320 "discard PREP from %6D, old seq no %u < %u", 1321 prep->prep_targetaddr, ":", 1322 prep->prep_targetseq, hr->hr_seq); 1323 return; 1324 } else if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq) && 1325 metric > rt->rt_metric) { 1326 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1327 "discard PREP from %6D, new metric %u > %u", 1328 prep->prep_targetaddr, ":", 1329 metric, rt->rt_metric); 1330 return; 1331 } 1332 } 1333 1334 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1335 "%s path to %6D, hopcount %d:%d metric %d:%d", 1336 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1337 "prefer" : "update", 1338 prep->prep_targetaddr, ":", 1339 rt->rt_nhops, prep->prep_hopcount + 1, 1340 rt->rt_metric, metric); 1341 1342 hr->hr_seq = prep->prep_targetseq; 1343 hr->hr_preqretries = 0; 1344 IEEE80211_ADDR_COPY(rt->rt_nexthop, ni->ni_macaddr); 1345 rt->rt_metric = metric; 1346 rt->rt_nhops = prep->prep_hopcount + 1; 1347 ieee80211_mesh_rt_update(rt, prep->prep_lifetime); 1348 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) { 1349 /* discovery complete */ 1350 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_DISCOVER; 1351 } 1352 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; /* mark valid */ 1353 1354 /* Update forwarding information to TA if metric improves */ 1355 hwmp_update_transmitter(vap, ni, "PREP"); 1356 1357 /* 1358 * If it's NOT for us, propagate the PREP 1359 */ 1360 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) && 1361 prep->prep_ttl > 1 && 1362 prep->prep_hopcount < hs->hs_maxhops) { 1363 struct ieee80211_meshprep_ie pprep; /* propagated PREP */ 1364 /* 1365 * NB: We should already have setup the path to orig 1366 * mesh STA when we propagated PREQ to target mesh STA, 1367 * no PREP is generated without a corresponding PREQ. 1368 * XXX: for now just ignore. 1369 */ 1370 if (rtorig == NULL) { 1371 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1372 "received PREP for an unknown orig(%6D)", 1373 prep->prep_origaddr, ":"); 1374 return; 1375 } 1376 1377 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1378 "propagate PREP from %6D", 1379 prep->prep_targetaddr, ":"); 1380 1381 memcpy(&pprep, prep, sizeof(pprep)); 1382 pprep.prep_hopcount += 1; 1383 pprep.prep_ttl -= 1; 1384 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni); 1385 hwmp_send_prep(vap, rtorig->rt_nexthop, &pprep); 1386 1387 /* precursor list for the Target Mesh STA Address is updated */ 1388 } 1389 1390 /* 1391 * Check if we received a PREP w/ AE and store target external address. 1392 * We may store target external address if recevied PREP w/ AE 1393 * and we are not final destination 1394 */ 1395 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 1396 rtext = ieee80211_mesh_rt_find(vap, 1397 prep->prep_target_ext_addr); 1398 if (rtext == NULL) { 1399 rtext = ieee80211_mesh_rt_add(vap, 1400 prep->prep_target_ext_addr); 1401 if (rtext == NULL) { 1402 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1403 "unable to add PREP path to proxy %6D", 1404 prep->prep_targetaddr, ":"); 1405 vap->iv_stats.is_mesh_rtaddfailed++; 1406 return; 1407 } 1408 } 1409 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1410 "%s path to %6D, hopcount %d:%d metric %d:%d", 1411 rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1412 "prefer" : "update", 1413 prep->prep_target_ext_addr, ":", 1414 rtext->rt_nhops, prep->prep_hopcount + 1, 1415 rtext->rt_metric, metric); 1416 1417 rtext->rt_flags = IEEE80211_MESHRT_FLAGS_PROXY | 1418 IEEE80211_MESHRT_FLAGS_VALID; 1419 IEEE80211_ADDR_COPY(rtext->rt_dest, 1420 prep->prep_target_ext_addr); 1421 IEEE80211_ADDR_COPY(rtext->rt_mesh_gate, 1422 prep->prep_targetaddr); 1423 IEEE80211_ADDR_COPY(rtext->rt_nexthop, wh->i_addr2); 1424 rtext->rt_metric = metric; 1425 rtext->rt_lifetime = prep->prep_lifetime; 1426 rtext->rt_nhops = prep->prep_hopcount + 1; 1427 rtext->rt_ext_seq = prep->prep_origseq; /* new proxy seq */ 1428 /* 1429 * XXX: proxy entries have no HWMP priv data, 1430 * nullify them to be sure? 1431 */ 1432 } 1433 /* 1434 * Check for frames queued awaiting path discovery. 1435 * XXX probably can tell exactly and avoid remove call 1436 * NB: hash may have false matches, if so they will get 1437 * stuck back on the stageq because there won't be 1438 * a path. 1439 */ 1440 addr = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ? 1441 prep->prep_target_ext_addr : prep->prep_targetaddr; 1442 m = ieee80211_ageq_remove(&ic->ic_stageq, 1443 (struct ieee80211_node *)(uintptr_t) 1444 ieee80211_mac_hash(ic, addr)); /* either dest or ext_dest */ 1445 1446 /* 1447 * All frames in the stageq here should be non-M_ENCAP; or things 1448 * will get very unhappy. 1449 */ 1450 for (; m != NULL; m = next) { 1451 next = m->m_nextpkt; 1452 m->m_nextpkt = NULL; 1453 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1454 "flush queued frame %p len %d", m, m->m_pkthdr.len); 1455 /* 1456 * If the mbuf has M_ENCAP set, ensure we free it. 1457 * Note that after if_transmit() is called, m is invalid. 1458 */ 1459 (void) ieee80211_vap_xmitpkt(vap, m); 1460 } 1461 #undef IS_PROXY 1462 #undef PROXIED_BY_US 1463 } 1464 1465 static int 1466 hwmp_send_prep(struct ieee80211vap *vap, 1467 const uint8_t da[IEEE80211_ADDR_LEN], 1468 struct ieee80211_meshprep_ie *prep) 1469 { 1470 /* NB: there's no PREP minimum interval. */ 1471 1472 /* 1473 * mesh prep action frame format 1474 * [6] da 1475 * [6] sa 1476 * [6] addr3 = sa 1477 * [1] action 1478 * [1] category 1479 * [tlv] mesh path reply 1480 */ 1481 prep->prep_ie = IEEE80211_ELEMID_MESHPREP; 1482 prep->prep_len = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ? 1483 IEEE80211_MESHPREP_BASE_SZ_AE : IEEE80211_MESHPREP_BASE_SZ; 1484 return hwmp_send_action(vap, da, (uint8_t *)prep, prep->prep_len + 2); 1485 } 1486 1487 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1488 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1489 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1490 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1491 static void 1492 hwmp_peerdown(struct ieee80211_node *ni) 1493 { 1494 struct ieee80211vap *vap = ni->ni_vap; 1495 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1496 struct ieee80211_meshperr_ie perr; 1497 struct ieee80211_mesh_route *rt; 1498 struct ieee80211_hwmp_route *hr; 1499 1500 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr); 1501 if (rt == NULL) 1502 return; 1503 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1504 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1505 "%s", "delete route entry"); 1506 perr.perr_ttl = ms->ms_ttl; 1507 perr.perr_ndests = 1; 1508 PERR_DFLAGS(0) = 0; 1509 if (hr->hr_seq == 0) 1510 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN; 1511 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC; 1512 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest); 1513 PERR_DSEQ(0) = ++hr->hr_seq; 1514 PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH; 1515 /* NB: flush everything passing through peer */ 1516 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr); 1517 hwmp_send_perr(vap, broadcastaddr, &perr); 1518 } 1519 #undef PERR_DFLAGS 1520 #undef PERR_DADDR 1521 #undef PERR_DSEQ 1522 #undef PERR_DRCODE 1523 1524 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags 1525 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr 1526 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 1527 #define PERR_DEXTADDR(n) perr->perr_dests[n].dest_ext_addr 1528 static void 1529 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni, 1530 const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr) 1531 { 1532 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1533 struct ieee80211_mesh_route *rt = NULL; 1534 struct ieee80211_mesh_route *rt_ext = NULL; 1535 struct ieee80211_hwmp_route *hr; 1536 struct ieee80211_meshperr_ie *pperr = NULL; 1537 int i, j = 0, forward = 0; 1538 1539 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1540 "received PERR from %6D", wh->i_addr2, ":"); 1541 1542 /* 1543 * if forwarding is true, prepare pperr 1544 */ 1545 if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) { 1546 forward = 1; 1547 pperr = IEEE80211_MALLOC(sizeof(*perr) + 31*sizeof(*perr->perr_dests), 1548 M_80211_MESH_PERR, IEEE80211_M_NOWAIT); /* XXX: magic number, 32 err dests */ 1549 } 1550 1551 /* 1552 * Acceptance criteria: check if we have forwarding information 1553 * stored about destination, and that nexthop == TA of this PERR. 1554 * NB: we also build a new PERR to propagate in case we should forward. 1555 */ 1556 for (i = 0; i < perr->perr_ndests; i++) { 1557 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i)); 1558 if (rt == NULL) 1559 continue; 1560 if (!IEEE80211_ADDR_EQ(rt->rt_nexthop, wh->i_addr2)) 1561 continue; 1562 1563 /* found and accepted a PERR ndest element, process it... */ 1564 if (forward) 1565 memcpy(&pperr->perr_dests[j], &perr->perr_dests[i], 1566 sizeof(*perr->perr_dests)); 1567 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1568 switch(PERR_DFLAGS(i)) { 1569 case (IEEE80211_REASON_MESH_PERR_NO_FI): 1570 if (PERR_DSEQ(i) == 0) { 1571 hr->hr_seq++; 1572 if (forward) { 1573 pperr->perr_dests[j].dest_seq = 1574 hr->hr_seq; 1575 } 1576 } else { 1577 hr->hr_seq = PERR_DSEQ(i); 1578 } 1579 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID; 1580 j++; 1581 break; 1582 case (IEEE80211_REASON_MESH_PERR_DEST_UNREACH): 1583 if(HWMP_SEQ_GT(PERR_DSEQ(i), hr->hr_seq)) { 1584 hr->hr_seq = PERR_DSEQ(i); 1585 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID; 1586 j++; 1587 } 1588 break; 1589 case (IEEE80211_REASON_MESH_PERR_NO_PROXY): 1590 rt_ext = ieee80211_mesh_rt_find(vap, PERR_DEXTADDR(i)); 1591 if (rt_ext != NULL) { 1592 rt_ext->rt_flags &= 1593 ~IEEE80211_MESHRT_FLAGS_VALID; 1594 j++; 1595 } 1596 break; 1597 default: 1598 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1599 "PERR, unknown reason code %u\n", PERR_DFLAGS(i)); 1600 goto done; /* XXX: stats?? */ 1601 } 1602 ieee80211_mesh_rt_flush_peer(vap, PERR_DADDR(i)); 1603 KASSERT(j < 32, ("PERR, error ndest >= 32 (%u)", j)); 1604 } 1605 if (j == 0) { 1606 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, "%s", 1607 "PERR not accepted"); 1608 goto done; /* XXX: stats?? */ 1609 } 1610 1611 /* 1612 * Propagate the PERR if we previously found it on our routing table. 1613 */ 1614 if (forward && perr->perr_ttl > 1) { 1615 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1616 "propagate PERR from %6D", wh->i_addr2, ":"); 1617 pperr->perr_ndests = j; 1618 pperr->perr_ttl--; 1619 hwmp_send_perr(vap, broadcastaddr, pperr); 1620 } 1621 done: 1622 if (pperr != NULL) 1623 IEEE80211_FREE(pperr, M_80211_MESH_PERR); 1624 } 1625 #undef PERR_DFLAGS 1626 #undef PERR_DADDR 1627 #undef PERR_DSEQ 1628 #undef PERR_DEXTADDR 1629 1630 static int 1631 hwmp_send_perr(struct ieee80211vap *vap, 1632 const uint8_t da[IEEE80211_ADDR_LEN], 1633 struct ieee80211_meshperr_ie *perr) 1634 { 1635 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1636 int i; 1637 uint8_t length = 0; 1638 1639 /* 1640 * Enforce PERR interval. 1641 */ 1642 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0) 1643 return EALREADY; 1644 getmicrouptime(&hs->hs_lastperr); 1645 1646 /* 1647 * mesh perr action frame format 1648 * [6] da 1649 * [6] sa 1650 * [6] addr3 = sa 1651 * [1] action 1652 * [1] category 1653 * [tlv] mesh path error 1654 */ 1655 perr->perr_ie = IEEE80211_ELEMID_MESHPERR; 1656 length = IEEE80211_MESHPERR_BASE_SZ; 1657 for (i = 0; i<perr->perr_ndests; i++) { 1658 if (perr->perr_dests[i].dest_flags & 1659 IEEE80211_MESHPERR_FLAGS_AE) { 1660 length += IEEE80211_MESHPERR_DEST_SZ_AE; 1661 continue ; 1662 } 1663 length += IEEE80211_MESHPERR_DEST_SZ; 1664 } 1665 perr->perr_len =length; 1666 return hwmp_send_action(vap, da, (uint8_t *)perr, perr->perr_len+2); 1667 } 1668 1669 /* 1670 * Called from the rest of the net80211 code (mesh code for example). 1671 * NB: IEEE80211_REASON_MESH_PERR_DEST_UNREACH can be trigger by the fact that 1672 * a mesh STA is unable to forward an MSDU/MMPDU to a next-hop mesh STA. 1673 */ 1674 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1675 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1676 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1677 #define PERR_DEXTADDR(n) perr.perr_dests[n].dest_ext_addr 1678 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1679 static void 1680 hwmp_senderror(struct ieee80211vap *vap, 1681 const uint8_t addr[IEEE80211_ADDR_LEN], 1682 struct ieee80211_mesh_route *rt, int rcode) 1683 { 1684 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1685 struct ieee80211_hwmp_route *hr = NULL; 1686 struct ieee80211_meshperr_ie perr; 1687 1688 if (rt != NULL) 1689 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1690 struct ieee80211_hwmp_route); 1691 1692 perr.perr_ndests = 1; 1693 perr.perr_ttl = ms->ms_ttl; 1694 PERR_DFLAGS(0) = 0; 1695 PERR_DRCODE(0) = rcode; 1696 1697 switch (rcode) { 1698 case IEEE80211_REASON_MESH_PERR_NO_FI: 1699 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr); 1700 PERR_DSEQ(0) = 0; /* reserved */ 1701 break; 1702 case IEEE80211_REASON_MESH_PERR_NO_PROXY: 1703 KASSERT(rt != NULL, ("no proxy info for sending PERR")); 1704 KASSERT(rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY, 1705 ("route is not marked proxy")); 1706 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_FLAGS_AE; 1707 IEEE80211_ADDR_COPY(PERR_DADDR(0), vap->iv_myaddr); 1708 PERR_DSEQ(0) = rt->rt_ext_seq; 1709 IEEE80211_ADDR_COPY(PERR_DEXTADDR(0), addr); 1710 break; 1711 case IEEE80211_REASON_MESH_PERR_DEST_UNREACH: 1712 KASSERT(rt != NULL, ("no route info for sending PERR")); 1713 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr); 1714 PERR_DSEQ(0) = hr->hr_seq; 1715 break; 1716 default: 1717 KASSERT(0, ("unknown reason code for HWMP PERR (%u)", rcode)); 1718 } 1719 hwmp_send_perr(vap, broadcastaddr, &perr); 1720 } 1721 #undef PERR_DFLAGS 1722 #undef PEER_DADDR 1723 #undef PERR_DSEQ 1724 #undef PERR_DEXTADDR 1725 #undef PERR_DRCODE 1726 1727 static void 1728 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni, 1729 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann) 1730 { 1731 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1732 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1733 struct ieee80211_mesh_route *rt = NULL; 1734 struct ieee80211_hwmp_route *hr; 1735 struct ieee80211_meshpreq_ie preq; 1736 struct ieee80211_meshrann_ie prann; 1737 1738 if (IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr)) 1739 return; 1740 1741 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr); 1742 if (rt != NULL && rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) { 1743 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1744 1745 /* Acceptance criteria: if RANN.seq < stored seq, discard RANN */ 1746 if (HWMP_SEQ_LT(rann->rann_seq, hr->hr_seq)) { 1747 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1748 "RANN seq %u < %u", rann->rann_seq, hr->hr_seq); 1749 return; 1750 } 1751 1752 /* Acceptance criteria: if RANN.seq == stored seq AND 1753 * RANN.metric > stored metric, discard RANN */ 1754 if (HWMP_SEQ_EQ(rann->rann_seq, hr->hr_seq) && 1755 rann->rann_metric > rt->rt_metric) { 1756 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1757 "RANN metric %u > %u", rann->rann_metric, rt->rt_metric); 1758 return; 1759 } 1760 } 1761 1762 /* RANN ACCEPTED */ 1763 1764 ieee80211_hwmp_rannint = rann->rann_interval; /* XXX: mtx lock? */ 1765 1766 if (rt == NULL) { 1767 rt = ieee80211_mesh_rt_add(vap, rann->rann_addr); 1768 if (rt == NULL) { 1769 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1770 "unable to add mac for RANN root %6D", 1771 rann->rann_addr, ":"); 1772 vap->iv_stats.is_mesh_rtaddfailed++; 1773 return; 1774 } 1775 } 1776 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1777 /* Check if root is a mesh gate, mark it */ 1778 if (rann->rann_flags & IEEE80211_MESHRANN_FLAGS_GATE) { 1779 struct ieee80211_mesh_gate_route *gr; 1780 1781 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE; 1782 gr = ieee80211_mesh_mark_gate(vap, rann->rann_addr, 1783 rt); 1784 gr->gr_lastseq = 0; /* NOT GANN */ 1785 } 1786 /* discovery timeout */ 1787 ieee80211_mesh_rt_update(rt, 1788 ticks_to_msecs(ieee80211_hwmp_roottimeout)); 1789 1790 preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM; 1791 preq.preq_hopcount = 0; 1792 preq.preq_ttl = ms->ms_ttl; 1793 preq.preq_id = 0; /* reserved */ 1794 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1795 preq.preq_origseq = ++hs->hs_seq; 1796 preq.preq_lifetime = ieee80211_hwmp_roottimeout; 1797 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1798 preq.preq_tcount = 1; 1799 preq.preq_targets[0].target_flags = IEEE80211_MESHPREQ_TFLAGS_TO; 1800 /* NB: IEEE80211_MESHPREQ_TFLAGS_USN = 0 implicitly implied */ 1801 IEEE80211_ADDR_COPY(preq.preq_targets[0].target_addr, rann->rann_addr); 1802 preq.preq_targets[0].target_seq = rann->rann_seq; 1803 /* XXX: if rootconfint have not passed, we built this preq in vain */ 1804 hwmp_send_preq(vap, wh->i_addr2, &preq, &hr->hr_lastrootconf, 1805 &ieee80211_hwmp_rootconfint); 1806 1807 /* propagate a RANN */ 1808 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1809 rann->rann_ttl > 1 && 1810 ms->ms_flags & IEEE80211_MESHFLAGS_FWD) { 1811 hr->hr_seq = rann->rann_seq; 1812 memcpy(&prann, rann, sizeof(prann)); 1813 prann.rann_hopcount += 1; 1814 prann.rann_ttl -= 1; 1815 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni); 1816 hwmp_send_rann(vap, broadcastaddr, &prann); 1817 } 1818 } 1819 1820 static int 1821 hwmp_send_rann(struct ieee80211vap *vap, 1822 const uint8_t da[IEEE80211_ADDR_LEN], 1823 struct ieee80211_meshrann_ie *rann) 1824 { 1825 /* 1826 * mesh rann action frame format 1827 * [6] da 1828 * [6] sa 1829 * [6] addr3 = sa 1830 * [1] action 1831 * [1] category 1832 * [tlv] root annoucement 1833 */ 1834 rann->rann_ie = IEEE80211_ELEMID_MESHRANN; 1835 rann->rann_len = IEEE80211_MESHRANN_BASE_SZ; 1836 return hwmp_send_action(vap, da, (uint8_t *)rann, rann->rann_len + 2); 1837 } 1838 1839 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 1840 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr 1841 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 1842 static void 1843 hwmp_rediscover_cb(void *arg) 1844 { 1845 struct ieee80211_mesh_route *rt = arg; 1846 struct ieee80211vap *vap = rt->rt_vap; 1847 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1848 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1849 struct ieee80211_hwmp_route *hr; 1850 struct ieee80211_meshpreq_ie preq; /* Optimize: storing first preq? */ 1851 1852 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) 1853 return ; /* nothing to do */ 1854 1855 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1856 if (hr->hr_preqretries >= 1857 ieee80211_hwmp_maxpreq_retries) { 1858 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, 1859 rt->rt_dest, "%s", 1860 "max number of discovery, send queued frames to GATE"); 1861 ieee80211_mesh_forward_to_gates(vap, rt); 1862 vap->iv_stats.is_mesh_fwd_nopath++; 1863 return ; /* XXX: flush queue? */ 1864 } 1865 1866 hr->hr_preqretries++; 1867 1868 1869 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, rt->rt_dest, 1870 "start path rediscovery , target seq %u", hr->hr_seq); 1871 /* 1872 * Try to discover the path for this node. 1873 * Group addressed PREQ Case A 1874 */ 1875 preq.preq_flags = 0; 1876 preq.preq_hopcount = 0; 1877 preq.preq_ttl = ms->ms_ttl; 1878 preq.preq_id = ++hs->hs_preqid; 1879 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1880 preq.preq_origseq = hr->hr_origseq; 1881 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_pathtimeout); 1882 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1883 preq.preq_tcount = 1; 1884 IEEE80211_ADDR_COPY(PREQ_TADDR(0), rt->rt_dest); 1885 PREQ_TFLAGS(0) = 0; 1886 if (ieee80211_hwmp_targetonly) 1887 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 1888 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 1889 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */ 1890 /* XXX check return value */ 1891 hwmp_send_preq(vap, broadcastaddr, &preq, &hr->hr_lastpreq, 1892 &ieee80211_hwmp_preqminint); 1893 callout_reset(&rt->rt_discovery, 1894 ieee80211_hwmp_net_diameter_traversaltime * 2, 1895 hwmp_rediscover_cb, rt); 1896 } 1897 1898 static struct ieee80211_node * 1899 hwmp_discover(struct ieee80211vap *vap, 1900 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m) 1901 { 1902 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1903 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1904 struct ieee80211_mesh_route *rt = NULL; 1905 struct ieee80211_hwmp_route *hr; 1906 struct ieee80211_meshpreq_ie preq; 1907 struct ieee80211_node *ni; 1908 int sendpreq = 0; 1909 1910 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1911 ("not a mesh vap, opmode %d", vap->iv_opmode)); 1912 1913 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest), 1914 ("%s: discovering self!", __func__)); 1915 1916 ni = NULL; 1917 if (!IEEE80211_IS_MULTICAST(dest)) { 1918 rt = ieee80211_mesh_rt_find(vap, dest); 1919 if (rt == NULL) { 1920 rt = ieee80211_mesh_rt_add(vap, dest); 1921 if (rt == NULL) { 1922 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 1923 ni, "unable to add discovery path to %6D", 1924 dest, ":"); 1925 vap->iv_stats.is_mesh_rtaddfailed++; 1926 goto done; 1927 } 1928 } 1929 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1930 struct ieee80211_hwmp_route); 1931 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) { 1932 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1933 "%s", "already discovering queue frame until path found"); 1934 sendpreq = 1; 1935 goto done; 1936 } 1937 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) { 1938 if (hr->hr_lastdiscovery != 0 && 1939 (ticks - hr->hr_lastdiscovery < 1940 (ieee80211_hwmp_net_diameter_traversaltime * 2))) { 1941 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 1942 dest, NULL, "%s", 1943 "too frequent discovery requeust"); 1944 sendpreq = 1; 1945 goto done; 1946 } 1947 hr->hr_lastdiscovery = ticks; 1948 if (hr->hr_preqretries >= 1949 ieee80211_hwmp_maxpreq_retries) { 1950 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 1951 dest, NULL, "%s", 1952 "no valid path , max number of discovery"); 1953 vap->iv_stats.is_mesh_fwd_nopath++; 1954 goto done; 1955 } 1956 rt->rt_flags = IEEE80211_MESHRT_FLAGS_DISCOVER; 1957 hr->hr_preqretries++; 1958 if (hr->hr_origseq == 0) 1959 hr->hr_origseq = ++hs->hs_seq; 1960 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1961 sendpreq = 1; 1962 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1963 "start path discovery (src %s), target seq %u", 1964 m == NULL ? "<none>" : ether_sprintf( 1965 mtod(m, struct ether_header *)->ether_shost), 1966 hr->hr_seq); 1967 /* 1968 * Try to discover the path for this node. 1969 * Group addressed PREQ Case A 1970 */ 1971 preq.preq_flags = 0; 1972 preq.preq_hopcount = 0; 1973 preq.preq_ttl = ms->ms_ttl; 1974 preq.preq_id = ++hs->hs_preqid; 1975 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1976 preq.preq_origseq = hr->hr_origseq; 1977 preq.preq_lifetime = 1978 ticks_to_msecs(ieee80211_hwmp_pathtimeout); 1979 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1980 preq.preq_tcount = 1; 1981 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest); 1982 PREQ_TFLAGS(0) = 0; 1983 if (ieee80211_hwmp_targetonly) 1984 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 1985 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 1986 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */ 1987 /* XXX check return value */ 1988 hwmp_send_preq(vap, broadcastaddr, &preq, 1989 &hr->hr_lastpreq, &ieee80211_hwmp_preqminint); 1990 callout_reset(&rt->rt_discovery, 1991 ieee80211_hwmp_net_diameter_traversaltime * 2, 1992 hwmp_rediscover_cb, rt); 1993 } 1994 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) 1995 ni = ieee80211_find_txnode(vap, rt->rt_nexthop); 1996 } else { 1997 ni = ieee80211_find_txnode(vap, dest); 1998 /* NB: if null then we leak mbuf */ 1999 KASSERT(ni != NULL, ("leak mcast frame")); 2000 return ni; 2001 } 2002 done: 2003 if (ni == NULL && m != NULL) { 2004 if (sendpreq) { 2005 struct ieee80211com *ic = vap->iv_ic; 2006 /* 2007 * Queue packet for transmit when path discovery 2008 * completes. If discovery never completes the 2009 * frame will be flushed by way of the aging timer. 2010 */ 2011 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 2012 "%s", "queue frame until path found"); 2013 m->m_pkthdr.rcvif = (void *)(uintptr_t) 2014 ieee80211_mac_hash(ic, dest); 2015 /* XXX age chosen randomly */ 2016 ieee80211_ageq_append(&ic->ic_stageq, m, 2017 IEEE80211_INACT_WAIT); 2018 } else { 2019 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 2020 dest, NULL, "%s", "no valid path to this node"); 2021 m_freem(m); 2022 } 2023 } 2024 return ni; 2025 } 2026 #undef PREQ_TFLAGS 2027 #undef PREQ_TADDR 2028 #undef PREQ_TSEQ 2029 2030 static int 2031 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 2032 { 2033 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 2034 int error; 2035 2036 if (vap->iv_opmode != IEEE80211_M_MBSS) 2037 return ENOSYS; 2038 error = 0; 2039 switch (ireq->i_type) { 2040 case IEEE80211_IOC_HWMP_ROOTMODE: 2041 ireq->i_val = hs->hs_rootmode; 2042 break; 2043 case IEEE80211_IOC_HWMP_MAXHOPS: 2044 ireq->i_val = hs->hs_maxhops; 2045 break; 2046 default: 2047 return ENOSYS; 2048 } 2049 return error; 2050 } 2051 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211); 2052 2053 static int 2054 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 2055 { 2056 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 2057 int error; 2058 2059 if (vap->iv_opmode != IEEE80211_M_MBSS) 2060 return ENOSYS; 2061 error = 0; 2062 switch (ireq->i_type) { 2063 case IEEE80211_IOC_HWMP_ROOTMODE: 2064 if (ireq->i_val < 0 || ireq->i_val > 3) 2065 return EINVAL; 2066 hs->hs_rootmode = ireq->i_val; 2067 hwmp_rootmode_setup(vap); 2068 break; 2069 case IEEE80211_IOC_HWMP_MAXHOPS: 2070 if (ireq->i_val <= 0 || ireq->i_val > 255) 2071 return EINVAL; 2072 hs->hs_maxhops = ireq->i_val; 2073 break; 2074 default: 2075 return ENOSYS; 2076 } 2077 return error; 2078 } 2079 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211); 2080