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 <netproto/802_11/ieee80211_var.h> 63 #include <netproto/802_11/ieee80211_action.h> 64 #include <netproto/802_11/ieee80211_input.h> 65 #include <netproto/802_11/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 #define HWMP_SEQ_GEQ(a, b) ((int32_t)((a)-(b)) >= 0) 132 133 #define HWMP_SEQ_MAX(a, b) (a > b ? a : b) 134 135 /* 136 * Private extension of ieee80211_mesh_route. 137 */ 138 struct ieee80211_hwmp_route { 139 ieee80211_hwmp_seq hr_seq; /* last HWMP seq seen from dst*/ 140 ieee80211_hwmp_seq hr_preqid; /* last PREQ ID seen from dst */ 141 ieee80211_hwmp_seq hr_origseq; /* seq. no. on our latest PREQ*/ 142 struct timeval hr_lastpreq; /* last time we sent a PREQ */ 143 struct timeval hr_lastrootconf; /* last sent PREQ root conf */ 144 int hr_preqretries; /* number of discoveries */ 145 int hr_lastdiscovery; /* last discovery in ticks */ 146 }; 147 struct ieee80211_hwmp_state { 148 ieee80211_hwmp_seq hs_seq; /* next seq to be used */ 149 ieee80211_hwmp_seq hs_preqid; /* next PREQ ID to be used */ 150 int hs_rootmode; /* proactive HWMP */ 151 struct timeval hs_lastperr; /* last time we sent a PERR */ 152 struct callout hs_roottimer; 153 uint8_t hs_maxhops; /* max hop count */ 154 }; 155 156 static SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0, 157 "IEEE 802.11s HWMP parameters"); 158 static int ieee80211_hwmp_targetonly = 0; 159 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLFLAG_RW, 160 &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs"); 161 static int ieee80211_hwmp_pathtimeout = -1; 162 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, CTLTYPE_INT | CTLFLAG_RW, 163 &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I", 164 "path entry lifetime (ms)"); 165 static int ieee80211_hwmp_maxpreq_retries = -1; 166 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, maxpreq_retries, CTLTYPE_INT | CTLFLAG_RW, 167 &ieee80211_hwmp_maxpreq_retries, 0, ieee80211_sysctl_msecs_ticks, "I", 168 "maximum number of preq retries"); 169 static int ieee80211_hwmp_net_diameter_traversaltime = -1; 170 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, net_diameter_traversal_time, 171 CTLTYPE_INT | CTLFLAG_RW, &ieee80211_hwmp_net_diameter_traversaltime, 0, 172 ieee80211_sysctl_msecs_ticks, "I", 173 "estimate travelse time across the MBSS (ms)"); 174 static int ieee80211_hwmp_roottimeout = -1; 175 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, CTLTYPE_INT | CTLFLAG_RW, 176 &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I", 177 "root PREQ timeout (ms)"); 178 static int ieee80211_hwmp_rootint = -1; 179 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, CTLTYPE_INT | CTLFLAG_RW, 180 &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I", 181 "root interval (ms)"); 182 static int ieee80211_hwmp_rannint = -1; 183 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, CTLTYPE_INT | CTLFLAG_RW, 184 &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I", 185 "root announcement interval (ms)"); 186 static struct timeval ieee80211_hwmp_rootconfint = { 0, 0 }; 187 static int ieee80211_hwmp_rootconfint_internal = -1; 188 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootconfint, CTLTYPE_INT | CTLFLAG_RD, 189 &ieee80211_hwmp_rootconfint_internal, 0, ieee80211_sysctl_msecs_ticks, "I", 190 "root confirmation interval (ms) (read-only)"); 191 192 #define IEEE80211_HWMP_DEFAULT_MAXHOPS 31 193 194 static ieee80211_recv_action_func hwmp_recv_action_meshpath; 195 196 static struct ieee80211_mesh_proto_path mesh_proto_hwmp = { 197 .mpp_descr = "HWMP", 198 .mpp_ie = IEEE80211_MESHCONF_PATH_HWMP, 199 .mpp_discover = hwmp_discover, 200 .mpp_peerdown = hwmp_peerdown, 201 .mpp_senderror = hwmp_senderror, 202 .mpp_vattach = hwmp_vattach, 203 .mpp_vdetach = hwmp_vdetach, 204 .mpp_newstate = hwmp_newstate, 205 .mpp_privlen = sizeof(struct ieee80211_hwmp_route), 206 }; 207 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact, CTLTYPE_INT | CTLFLAG_RW, 208 &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I", 209 "mesh route inactivity timeout (ms)"); 210 211 212 static void 213 ieee80211_hwmp_init(void) 214 { 215 /* Default values as per amendment */ 216 ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000); 217 ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000); 218 ieee80211_hwmp_rootint = msecs_to_ticks(2*1000); 219 ieee80211_hwmp_rannint = msecs_to_ticks(1*1000); 220 ieee80211_hwmp_rootconfint_internal = msecs_to_ticks(2*1000); 221 ieee80211_hwmp_maxpreq_retries = 3; 222 /* 223 * (TU): A measurement of time equal to 1024 μs, 224 * 500 TU is 512 ms. 225 */ 226 ieee80211_hwmp_net_diameter_traversaltime = msecs_to_ticks(512); 227 228 /* 229 * NB: I dont know how to make SYSCTL_PROC that calls ms to ticks 230 * and return a struct timeval... 231 */ 232 ieee80211_hwmp_rootconfint.tv_usec = 233 ieee80211_hwmp_rootconfint_internal * 1000; 234 235 /* 236 * Register action frame handler. 237 */ 238 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESH, 239 IEEE80211_ACTION_MESH_HWMP, hwmp_recv_action_meshpath); 240 241 /* NB: default is 5 secs per spec */ 242 mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000); 243 244 /* 245 * Register HWMP. 246 */ 247 ieee80211_mesh_register_proto_path(&mesh_proto_hwmp); 248 } 249 SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL); 250 251 static void 252 hwmp_vattach(struct ieee80211vap *vap) 253 { 254 struct ieee80211_hwmp_state *hs; 255 256 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 257 ("not a mesh vap, opmode %d", vap->iv_opmode)); 258 259 #if defined(__DragonFly__) 260 hs = kmalloc(sizeof(struct ieee80211_hwmp_state), M_80211_VAP, 261 M_INTWAIT | M_ZERO); 262 #else 263 hs = IEEE80211_MALLOC(sizeof(struct ieee80211_hwmp_state), M_80211_VAP, 264 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 265 #endif 266 if (hs == NULL) { 267 kprintf("%s: couldn't alloc HWMP state\n", __func__); 268 return; 269 } 270 hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS; 271 #if defined(__DragonFly__) 272 callout_init_mp(&hs->hs_roottimer); 273 #else 274 callout_init(&hs->hs_roottimer, 1); 275 #endif 276 vap->iv_hwmp = hs; 277 } 278 279 static void 280 hwmp_vdetach(struct ieee80211vap *vap) 281 { 282 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 283 284 callout_drain(&hs->hs_roottimer); 285 IEEE80211_FREE(vap->iv_hwmp, M_80211_VAP); 286 vap->iv_hwmp = NULL; 287 } 288 289 static int 290 hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg) 291 { 292 enum ieee80211_state nstate = vap->iv_state; 293 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 294 295 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 296 __func__, ieee80211_state_name[ostate], 297 ieee80211_state_name[nstate], arg); 298 299 if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN) 300 callout_drain(&hs->hs_roottimer); 301 if (nstate == IEEE80211_S_RUN) 302 hwmp_rootmode_setup(vap); 303 return 0; 304 } 305 306 /* 307 * Verify the length of an HWMP PREQ and return the number 308 * of destinations >= 1, if verification fails -1 is returned. 309 */ 310 static int 311 verify_mesh_preq_len(struct ieee80211vap *vap, 312 const struct ieee80211_frame *wh, const uint8_t *iefrm) 313 { 314 int alloc_sz = -1; 315 int ndest = -1; 316 if (iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE) { 317 /* Originator External Address present */ 318 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ_AE; 319 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET_AE]; 320 } else { 321 /* w/o Originator External Address */ 322 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ; 323 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET]; 324 } 325 alloc_sz += ndest * IEEE80211_MESHPREQ_TRGT_SZ; 326 327 if(iefrm[1] != (alloc_sz)) { 328 IEEE80211_DISCARD(vap, 329 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 330 wh, NULL, "PREQ (AE=%s) with wrong len", 331 iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE ? "1" : "0"); 332 return (-1); 333 } 334 return ndest; 335 } 336 337 /* 338 * Verify the length of an HWMP PREP and returns 1 on success, 339 * otherwise -1. 340 */ 341 static int 342 verify_mesh_prep_len(struct ieee80211vap *vap, 343 const struct ieee80211_frame *wh, const uint8_t *iefrm) 344 { 345 int alloc_sz = -1; 346 if (iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE) { 347 if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ_AE) 348 alloc_sz = IEEE80211_MESHPREP_BASE_SZ_AE; 349 } else if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ) 350 alloc_sz = IEEE80211_MESHPREP_BASE_SZ; 351 if(alloc_sz < 0) { 352 IEEE80211_DISCARD(vap, 353 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 354 wh, NULL, "PREP (AE=%s) with wrong len", 355 iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE ? "1" : "0"); 356 return (-1); 357 } 358 return (1); 359 } 360 361 /* 362 * Verify the length of an HWMP PERR and return the number 363 * of destinations >= 1, if verification fails -1 is returned. 364 */ 365 static int 366 verify_mesh_perr_len(struct ieee80211vap *vap, 367 const struct ieee80211_frame *wh, const uint8_t *iefrm) 368 { 369 int alloc_sz = -1; 370 const uint8_t *iefrm_t = iefrm; 371 uint8_t ndest = iefrm_t[IEEE80211_MESHPERR_NDEST_OFFSET]; 372 int i; 373 374 if(ndest > IEEE80211_MESHPERR_MAXDEST) { 375 IEEE80211_DISCARD(vap, 376 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 377 wh, NULL, "PERR with wrong number of destionat (>19), %u", 378 ndest); 379 return (-1); 380 } 381 382 iefrm_t += IEEE80211_MESHPERR_NDEST_OFFSET + 1; /* flag is next field */ 383 /* We need to check each destionation flag to know size */ 384 for(i = 0; i<ndest; i++) { 385 if ((*iefrm_t) & IEEE80211_MESHPERR_FLAGS_AE) 386 iefrm_t += IEEE80211_MESHPERR_DEST_SZ_AE; 387 else 388 iefrm_t += IEEE80211_MESHPERR_DEST_SZ; 389 } 390 391 alloc_sz = (iefrm_t - iefrm) - 2; /* action + code */ 392 if(alloc_sz != iefrm[1]) { 393 IEEE80211_DISCARD(vap, 394 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 395 wh, NULL, "%s", "PERR with wrong len"); 396 return (-1); 397 } 398 return ndest; 399 } 400 401 static int 402 hwmp_recv_action_meshpath(struct ieee80211_node *ni, 403 const struct ieee80211_frame *wh, 404 const uint8_t *frm, const uint8_t *efrm) 405 { 406 struct ieee80211vap *vap = ni->ni_vap; 407 struct ieee80211_meshpreq_ie *preq; 408 struct ieee80211_meshprep_ie *prep; 409 struct ieee80211_meshperr_ie *perr; 410 struct ieee80211_meshrann_ie rann; 411 const uint8_t *iefrm = frm + 2; /* action + code */ 412 const uint8_t *iefrm_t = iefrm; /* temporary pointer */ 413 int ndest = -1; 414 int found = 0; 415 416 while (efrm - iefrm > 1) { 417 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0); 418 switch (*iefrm) { 419 case IEEE80211_ELEMID_MESHPREQ: 420 { 421 int i = 0; 422 423 iefrm_t = iefrm; 424 ndest = verify_mesh_preq_len(vap, wh, iefrm_t); 425 if (ndest < 0) { 426 vap->iv_stats.is_rx_mgtdiscard++; 427 break; 428 } 429 #if defined(__DragonFly__) 430 preq = kmalloc(sizeof(*preq) + 431 (ndest - 1) * sizeof(*preq->preq_targets), 432 M_80211_MESH_PREQ, M_INTWAIT | M_ZERO); 433 #else 434 preq = IEEE80211_MALLOC(sizeof(*preq) + 435 (ndest - 1) * sizeof(*preq->preq_targets), 436 M_80211_MESH_PREQ, 437 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 438 #endif 439 KASSERT(preq != NULL, ("preq == NULL")); 440 441 preq->preq_ie = *iefrm_t++; 442 preq->preq_len = *iefrm_t++; 443 preq->preq_flags = *iefrm_t++; 444 preq->preq_hopcount = *iefrm_t++; 445 preq->preq_ttl = *iefrm_t++; 446 preq->preq_id = le32dec(iefrm_t); iefrm_t += 4; 447 IEEE80211_ADDR_COPY(preq->preq_origaddr, iefrm_t); 448 iefrm_t += 6; 449 preq->preq_origseq = le32dec(iefrm_t); iefrm_t += 4; 450 /* NB: may have Originator Proxied Address */ 451 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 452 IEEE80211_ADDR_COPY( 453 preq->preq_orig_ext_addr, iefrm_t); 454 iefrm_t += 6; 455 } 456 preq->preq_lifetime = le32dec(iefrm_t); iefrm_t += 4; 457 preq->preq_metric = le32dec(iefrm_t); iefrm_t += 4; 458 preq->preq_tcount = *iefrm_t++; 459 460 for (i = 0; i < preq->preq_tcount; i++) { 461 preq->preq_targets[i].target_flags = *iefrm_t++; 462 IEEE80211_ADDR_COPY( 463 preq->preq_targets[i].target_addr, iefrm_t); 464 iefrm_t += 6; 465 preq->preq_targets[i].target_seq = 466 le32dec(iefrm_t); 467 iefrm_t += 4; 468 } 469 470 hwmp_recv_preq(vap, ni, wh, preq); 471 IEEE80211_FREE(preq, M_80211_MESH_PREQ); 472 found++; 473 break; 474 } 475 case IEEE80211_ELEMID_MESHPREP: 476 { 477 iefrm_t = iefrm; 478 ndest = verify_mesh_prep_len(vap, wh, iefrm_t); 479 if (ndest < 0) { 480 vap->iv_stats.is_rx_mgtdiscard++; 481 break; 482 } 483 #if defined(__DragonFly__) 484 prep = kmalloc(sizeof(*prep), 485 M_80211_MESH_PREP, M_INTWAIT | M_ZERO); 486 #else 487 prep = IEEE80211_MALLOC(sizeof(*prep), 488 M_80211_MESH_PREP, 489 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 490 #endif 491 KASSERT(prep != NULL, ("prep == NULL")); 492 493 prep->prep_ie = *iefrm_t++; 494 prep->prep_len = *iefrm_t++; 495 prep->prep_flags = *iefrm_t++; 496 prep->prep_hopcount = *iefrm_t++; 497 prep->prep_ttl = *iefrm_t++; 498 IEEE80211_ADDR_COPY(prep->prep_targetaddr, iefrm_t); 499 iefrm_t += 6; 500 prep->prep_targetseq = le32dec(iefrm_t); iefrm_t += 4; 501 /* NB: May have Target Proxied Address */ 502 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 503 IEEE80211_ADDR_COPY( 504 prep->prep_target_ext_addr, iefrm_t); 505 iefrm_t += 6; 506 } 507 prep->prep_lifetime = le32dec(iefrm_t); iefrm_t += 4; 508 prep->prep_metric = le32dec(iefrm_t); iefrm_t += 4; 509 IEEE80211_ADDR_COPY(prep->prep_origaddr, iefrm_t); 510 iefrm_t += 6; 511 prep->prep_origseq = le32dec(iefrm_t); iefrm_t += 4; 512 513 hwmp_recv_prep(vap, ni, wh, prep); 514 IEEE80211_FREE(prep, M_80211_MESH_PREP); 515 found++; 516 break; 517 } 518 case IEEE80211_ELEMID_MESHPERR: 519 { 520 int i = 0; 521 522 iefrm_t = iefrm; 523 ndest = verify_mesh_perr_len(vap, wh, iefrm_t); 524 if (ndest < 0) { 525 vap->iv_stats.is_rx_mgtdiscard++; 526 break; 527 } 528 #if defined(__DragonFly__) 529 perr = kmalloc(sizeof(*perr) + 530 (ndest - 1) * sizeof(*perr->perr_dests), 531 M_80211_MESH_PERR, M_INTWAIT | M_ZERO); 532 #else 533 perr = IEEE80211_MALLOC(sizeof(*perr) + 534 (ndest - 1) * sizeof(*perr->perr_dests), 535 M_80211_MESH_PERR, 536 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 537 #endif 538 KASSERT(perr != NULL, ("perr == NULL")); 539 540 perr->perr_ie = *iefrm_t++; 541 perr->perr_len = *iefrm_t++; 542 perr->perr_ttl = *iefrm_t++; 543 perr->perr_ndests = *iefrm_t++; 544 545 for (i = 0; i<perr->perr_ndests; i++) { 546 perr->perr_dests[i].dest_flags = *iefrm_t++; 547 IEEE80211_ADDR_COPY( 548 perr->perr_dests[i].dest_addr, iefrm_t); 549 iefrm_t += 6; 550 perr->perr_dests[i].dest_seq = le32dec(iefrm_t); 551 iefrm_t += 4; 552 /* NB: May have Target Proxied Address */ 553 if (perr->perr_dests[i].dest_flags & 554 IEEE80211_MESHPERR_FLAGS_AE) { 555 IEEE80211_ADDR_COPY( 556 perr->perr_dests[i].dest_ext_addr, 557 iefrm_t); 558 iefrm_t += 6; 559 } 560 perr->perr_dests[i].dest_rcode = 561 le16dec(iefrm_t); 562 iefrm_t += 2; 563 } 564 565 hwmp_recv_perr(vap, ni, wh, perr); 566 IEEE80211_FREE(perr, M_80211_MESH_PERR); 567 found++; 568 break; 569 } 570 case IEEE80211_ELEMID_MESHRANN: 571 { 572 const struct ieee80211_meshrann_ie *mrann = 573 (const struct ieee80211_meshrann_ie *) iefrm; 574 if (mrann->rann_len != 575 sizeof(struct ieee80211_meshrann_ie) - 2) { 576 IEEE80211_DISCARD(vap, 577 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 578 wh, NULL, "%s", "RAN with wrong len"); 579 vap->iv_stats.is_rx_mgtdiscard++; 580 return 1; 581 } 582 memcpy(&rann, mrann, sizeof(rann)); 583 rann.rann_seq = le32dec(&mrann->rann_seq); 584 rann.rann_interval = le32dec(&mrann->rann_interval); 585 rann.rann_metric = le32dec(&mrann->rann_metric); 586 hwmp_recv_rann(vap, ni, wh, &rann); 587 found++; 588 break; 589 } 590 } 591 iefrm += iefrm[1] + 2; 592 } 593 if (!found) { 594 IEEE80211_DISCARD(vap, 595 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 596 wh, NULL, "%s", "PATH SEL action without IE"); 597 vap->iv_stats.is_rx_mgtdiscard++; 598 } 599 return 0; 600 } 601 602 static int 603 hwmp_send_action(struct ieee80211vap *vap, 604 const uint8_t da[IEEE80211_ADDR_LEN], 605 uint8_t *ie, size_t len) 606 { 607 struct ieee80211_node *ni; 608 struct ieee80211com *ic; 609 struct ieee80211_bpf_params params; 610 struct mbuf *m; 611 uint8_t *frm; 612 int ret; 613 614 if (IEEE80211_IS_MULTICAST(da)) { 615 ni = ieee80211_ref_node(vap->iv_bss); 616 #ifdef IEEE80211_DEBUG_REFCNT 617 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 618 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 619 __func__, __LINE__, 620 ni, ether_sprintf(ni->ni_macaddr), 621 ieee80211_node_refcnt(ni)+1); 622 #endif 623 ieee80211_ref_node(ni); 624 } 625 else 626 ni = ieee80211_mesh_find_txnode(vap, da); 627 628 if (vap->iv_state == IEEE80211_S_CAC) { 629 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 630 "block %s frame in CAC state", "HWMP action"); 631 vap->iv_stats.is_tx_badstate++; 632 return EIO; /* XXX */ 633 } 634 635 KASSERT(ni != NULL, ("null node")); 636 ic = ni->ni_ic; 637 638 m = ieee80211_getmgtframe(&frm, 639 ic->ic_headroom + sizeof(struct ieee80211_frame), 640 sizeof(struct ieee80211_action) + len 641 ); 642 if (m == NULL) { 643 ieee80211_free_node(ni); 644 vap->iv_stats.is_tx_nobuf++; 645 return ENOMEM; 646 } 647 *frm++ = IEEE80211_ACTION_CAT_MESH; 648 *frm++ = IEEE80211_ACTION_MESH_HWMP; 649 switch (*ie) { 650 case IEEE80211_ELEMID_MESHPREQ: 651 frm = hwmp_add_meshpreq(frm, 652 (struct ieee80211_meshpreq_ie *)ie); 653 break; 654 case IEEE80211_ELEMID_MESHPREP: 655 frm = hwmp_add_meshprep(frm, 656 (struct ieee80211_meshprep_ie *)ie); 657 break; 658 case IEEE80211_ELEMID_MESHPERR: 659 frm = hwmp_add_meshperr(frm, 660 (struct ieee80211_meshperr_ie *)ie); 661 break; 662 case IEEE80211_ELEMID_MESHRANN: 663 frm = hwmp_add_meshrann(frm, 664 (struct ieee80211_meshrann_ie *)ie); 665 break; 666 } 667 668 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 669 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 670 if (m == NULL) { 671 ieee80211_free_node(ni); 672 vap->iv_stats.is_tx_nobuf++; 673 return ENOMEM; 674 } 675 676 IEEE80211_TX_LOCK(ic); 677 678 ieee80211_send_setup(ni, m, 679 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION, 680 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, vap->iv_myaddr); 681 682 m->m_flags |= M_ENCAP; /* mark encapsulated */ 683 IEEE80211_NODE_STAT(ni, tx_mgmt); 684 685 memset(¶ms, 0, sizeof(params)); 686 params.ibp_pri = WME_AC_VO; 687 params.ibp_rate0 = ni->ni_txparms->mgmtrate; 688 if (IEEE80211_IS_MULTICAST(da)) 689 params.ibp_try0 = 1; 690 else 691 params.ibp_try0 = ni->ni_txparms->maxretry; 692 params.ibp_power = ni->ni_txpower; 693 ret = ieee80211_raw_output(vap, ni, m, ¶ms); 694 IEEE80211_TX_UNLOCK(ic); 695 return (ret); 696 } 697 698 #define ADDSHORT(frm, v) do { \ 699 le16enc(frm, v); \ 700 frm += 2; \ 701 } while (0) 702 #define ADDWORD(frm, v) do { \ 703 le32enc(frm, v); \ 704 frm += 4; \ 705 } while (0) 706 /* 707 * Add a Mesh Path Request IE to a frame. 708 */ 709 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags 710 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr 711 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq 712 static uint8_t * 713 hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq) 714 { 715 int i; 716 717 *frm++ = IEEE80211_ELEMID_MESHPREQ; 718 *frm++ = preq->preq_len; /* len already calculated */ 719 *frm++ = preq->preq_flags; 720 *frm++ = preq->preq_hopcount; 721 *frm++ = preq->preq_ttl; 722 ADDWORD(frm, preq->preq_id); 723 IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6; 724 ADDWORD(frm, preq->preq_origseq); 725 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 726 IEEE80211_ADDR_COPY(frm, preq->preq_orig_ext_addr); 727 frm += 6; 728 } 729 ADDWORD(frm, preq->preq_lifetime); 730 ADDWORD(frm, preq->preq_metric); 731 *frm++ = preq->preq_tcount; 732 for (i = 0; i < preq->preq_tcount; i++) { 733 *frm++ = PREQ_TFLAGS(i); 734 IEEE80211_ADDR_COPY(frm, PREQ_TADDR(i)); 735 frm += 6; 736 ADDWORD(frm, PREQ_TSEQ(i)); 737 } 738 return frm; 739 } 740 #undef PREQ_TFLAGS 741 #undef PREQ_TADDR 742 #undef PREQ_TSEQ 743 744 /* 745 * Add a Mesh Path Reply IE to a frame. 746 */ 747 static uint8_t * 748 hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep) 749 { 750 *frm++ = IEEE80211_ELEMID_MESHPREP; 751 *frm++ = prep->prep_len; /* len already calculated */ 752 *frm++ = prep->prep_flags; 753 *frm++ = prep->prep_hopcount; 754 *frm++ = prep->prep_ttl; 755 IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6; 756 ADDWORD(frm, prep->prep_targetseq); 757 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 758 IEEE80211_ADDR_COPY(frm, prep->prep_target_ext_addr); 759 frm += 6; 760 } 761 ADDWORD(frm, prep->prep_lifetime); 762 ADDWORD(frm, prep->prep_metric); 763 IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6; 764 ADDWORD(frm, prep->prep_origseq); 765 return frm; 766 } 767 768 /* 769 * Add a Mesh Path Error IE to a frame. 770 */ 771 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags 772 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr 773 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 774 #define PERR_EXTADDR(n) perr->perr_dests[n].dest_ext_addr 775 #define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode 776 static uint8_t * 777 hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr) 778 { 779 int i; 780 781 *frm++ = IEEE80211_ELEMID_MESHPERR; 782 *frm++ = perr->perr_len; /* len already calculated */ 783 *frm++ = perr->perr_ttl; 784 *frm++ = perr->perr_ndests; 785 for (i = 0; i < perr->perr_ndests; i++) { 786 *frm++ = PERR_DFLAGS(i); 787 IEEE80211_ADDR_COPY(frm, PERR_DADDR(i)); 788 frm += 6; 789 ADDWORD(frm, PERR_DSEQ(i)); 790 if (PERR_DFLAGS(i) & IEEE80211_MESHPERR_FLAGS_AE) { 791 IEEE80211_ADDR_COPY(frm, PERR_EXTADDR(i)); 792 frm += 6; 793 } 794 ADDSHORT(frm, PERR_DRCODE(i)); 795 } 796 return frm; 797 } 798 #undef PERR_DFLAGS 799 #undef PERR_DADDR 800 #undef PERR_DSEQ 801 #undef PERR_EXTADDR 802 #undef PERR_DRCODE 803 804 /* 805 * Add a Root Annoucement IE to a frame. 806 */ 807 static uint8_t * 808 hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann) 809 { 810 *frm++ = IEEE80211_ELEMID_MESHRANN; 811 *frm++ = rann->rann_len; 812 *frm++ = rann->rann_flags; 813 *frm++ = rann->rann_hopcount; 814 *frm++ = rann->rann_ttl; 815 IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6; 816 ADDWORD(frm, rann->rann_seq); 817 ADDWORD(frm, rann->rann_interval); 818 ADDWORD(frm, rann->rann_metric); 819 return frm; 820 } 821 822 static void 823 hwmp_rootmode_setup(struct ieee80211vap *vap) 824 { 825 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 826 struct ieee80211_mesh_state *ms = vap->iv_mesh; 827 828 switch (hs->hs_rootmode) { 829 case IEEE80211_HWMP_ROOTMODE_DISABLED: 830 callout_drain(&hs->hs_roottimer); 831 ms->ms_flags &= ~IEEE80211_MESHFLAGS_ROOT; 832 break; 833 case IEEE80211_HWMP_ROOTMODE_NORMAL: 834 case IEEE80211_HWMP_ROOTMODE_PROACTIVE: 835 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint, 836 hwmp_rootmode_cb, vap); 837 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT; 838 break; 839 case IEEE80211_HWMP_ROOTMODE_RANN: 840 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint, 841 hwmp_rootmode_rann_cb, vap); 842 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT; 843 break; 844 } 845 } 846 847 /* 848 * Send a broadcast Path Request to find all nodes on the mesh. We are 849 * called when the vap is configured as a HWMP root node. 850 */ 851 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 852 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr 853 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 854 static void 855 hwmp_rootmode_cb(void *arg) 856 { 857 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 858 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 859 struct ieee80211_mesh_state *ms = vap->iv_mesh; 860 struct ieee80211_meshpreq_ie preq; 861 862 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 863 "%s", "send broadcast PREQ"); 864 865 preq.preq_flags = 0; 866 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE) 867 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_GATE; 868 if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE) 869 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP; 870 preq.preq_hopcount = 0; 871 preq.preq_ttl = ms->ms_ttl; 872 preq.preq_id = ++hs->hs_preqid; 873 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 874 preq.preq_origseq = ++hs->hs_seq; 875 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout); 876 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 877 preq.preq_tcount = 1; 878 IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr); 879 PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO | 880 IEEE80211_MESHPREQ_TFLAGS_USN; 881 PREQ_TSEQ(0) = 0; 882 vap->iv_stats.is_hwmp_rootreqs++; 883 /* NB: we enforce rate check ourself */ 884 hwmp_send_preq(vap, broadcastaddr, &preq, NULL, NULL); 885 hwmp_rootmode_setup(vap); 886 } 887 #undef PREQ_TFLAGS 888 #undef PREQ_TADDR 889 #undef PREQ_TSEQ 890 891 /* 892 * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are 893 * called when the vap is configured as a HWMP RANN root node. 894 */ 895 static void 896 hwmp_rootmode_rann_cb(void *arg) 897 { 898 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 899 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 900 struct ieee80211_mesh_state *ms = vap->iv_mesh; 901 struct ieee80211_meshrann_ie rann; 902 903 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 904 "%s", "send broadcast RANN"); 905 906 rann.rann_flags = 0; 907 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE) 908 rann.rann_flags |= IEEE80211_MESHFLAGS_GATE; 909 rann.rann_hopcount = 0; 910 rann.rann_ttl = ms->ms_ttl; 911 IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr); 912 rann.rann_seq = ++hs->hs_seq; 913 rann.rann_interval = ieee80211_hwmp_rannint; 914 rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 915 916 vap->iv_stats.is_hwmp_rootrann++; 917 hwmp_send_rann(vap, broadcastaddr, &rann); 918 hwmp_rootmode_setup(vap); 919 } 920 921 /* 922 * Update forwarding information to TA if metric improves. 923 */ 924 static void 925 hwmp_update_transmitter(struct ieee80211vap *vap, struct ieee80211_node *ni, 926 const char *hwmp_frame) 927 { 928 struct ieee80211_mesh_state *ms = vap->iv_mesh; 929 struct ieee80211_mesh_route *rttran = NULL; /* Transmitter */ 930 int metric = 0; 931 932 rttran = ieee80211_mesh_rt_find(vap, ni->ni_macaddr); 933 if (rttran == NULL) { 934 rttran = ieee80211_mesh_rt_add(vap, ni->ni_macaddr); 935 if (rttran == NULL) { 936 #if defined(__DragonFly__) 937 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 938 "unable to add path to transmitter %s of %s", 939 ether_sprintf(ni->ni_macaddr), hwmp_frame); 940 #else 941 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 942 "unable to add path to transmitter %6D of %s", 943 ni->ni_macaddr, ":", hwmp_frame); 944 #endif 945 vap->iv_stats.is_mesh_rtaddfailed++; 946 return; 947 } 948 } 949 metric = ms->ms_pmetric->mpm_metric(ni); 950 if (!(rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) || 951 rttran->rt_metric > metric) 952 { 953 #if defined(__DragonFly__) 954 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 955 "%s path to transmitter %s of %s, metric %d:%d", 956 rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 957 "prefer" : "update", ether_sprintf(ni->ni_macaddr), 958 hwmp_frame, 959 rttran->rt_metric, metric); 960 #else 961 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 962 "%s path to transmiter %6D of %s, metric %d:%d", 963 rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 964 "prefer" : "update", ni->ni_macaddr, ":", hwmp_frame, 965 rttran->rt_metric, metric); 966 #endif 967 IEEE80211_ADDR_COPY(rttran->rt_nexthop, ni->ni_macaddr); 968 rttran->rt_metric = metric; 969 rttran->rt_nhops = 1; 970 ieee80211_mesh_rt_update(rttran, ms->ms_ppath->mpp_inact); 971 rttran->rt_flags = IEEE80211_MESHRT_FLAGS_VALID; 972 } 973 } 974 975 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags 976 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr 977 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq 978 static void 979 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni, 980 const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq) 981 { 982 struct ieee80211_mesh_state *ms = vap->iv_mesh; 983 struct ieee80211_mesh_route *rtorig = NULL; 984 struct ieee80211_mesh_route *rtorig_ext = NULL; 985 struct ieee80211_mesh_route *rttarg = NULL; 986 struct ieee80211_hwmp_route *hrorig = NULL; 987 struct ieee80211_hwmp_route *hrtarg = NULL; 988 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 989 struct ieee80211_meshprep_ie prep; 990 ieee80211_hwmp_seq preqid; /* last seen preqid for orig */ 991 uint32_t metric = 0; 992 993 /* 994 * Ignore PREQs from us. Could happen because someone forward it 995 * back to us. 996 */ 997 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr)) 998 return; 999 1000 #if defined(__DragonFly__) 1001 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1002 "received PREQ, orig %s, targ(0) %s", 1003 ether_sprintf(preq->preq_origaddr), 1004 ether_sprintf(PREQ_TADDR(0))); 1005 #else 1006 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1007 "received PREQ, orig %6D, targ(0) %6D", preq->preq_origaddr, ":", 1008 PREQ_TADDR(0), ":"); 1009 #endif 1010 1011 /* 1012 * Acceptance criteria: (if the PREQ is not for us or not broadcast, 1013 * or an external mac address not proxied by us), 1014 * AND forwarding is disabled, discard this PREQ. 1015 */ 1016 rttarg = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0)); 1017 if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD) && 1018 (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) || 1019 !IEEE80211_IS_MULTICAST(PREQ_TADDR(0)) || 1020 (rttarg != NULL && 1021 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY && 1022 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate)))) { 1023 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 1024 preq->preq_origaddr, NULL, "%s", "not accepting PREQ"); 1025 return; 1026 } 1027 /* 1028 * Acceptance criteria: if unicast addressed 1029 * AND no valid forwarding for Target of PREQ, discard this PREQ. 1030 */ 1031 if(rttarg != NULL) 1032 hrtarg = IEEE80211_MESH_ROUTE_PRIV(rttarg, 1033 struct ieee80211_hwmp_route); 1034 /* Address mode: ucast */ 1035 if(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AM && 1036 rttarg == NULL && 1037 !IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) { 1038 #if defined(__DragonFly__) 1039 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 1040 preq->preq_origaddr, NULL, 1041 "unicast addressed PREQ of unknown target %s", 1042 ether_sprintf(PREQ_TADDR(0))); 1043 #else 1044 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 1045 preq->preq_origaddr, NULL, 1046 "unicast addressed PREQ of unknown target %6D", 1047 PREQ_TADDR(0), ":"); 1048 #endif 1049 return; 1050 } 1051 1052 /* PREQ ACCEPTED */ 1053 1054 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr); 1055 if (rtorig == NULL) { 1056 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr); 1057 if (rtorig == NULL) { 1058 #if defined(__DragonFly__) 1059 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1060 "unable to add orig path to %s", 1061 ether_sprintf(preq->preq_origaddr)); 1062 #else 1063 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1064 "unable to add orig path to %6D", 1065 preq->preq_origaddr, ":"); 1066 #endif 1067 vap->iv_stats.is_mesh_rtaddfailed++; 1068 return; 1069 } 1070 #if defined(__DragonFly__) 1071 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1072 "adding originator %s", 1073 ether_sprintf(preq->preq_origaddr)); 1074 #else 1075 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1076 "adding originator %6D", preq->preq_origaddr, ":"); 1077 #endif 1078 } 1079 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route); 1080 1081 /* record last seen preqid */ 1082 preqid = hrorig->hr_preqid; 1083 hrorig->hr_preqid = HWMP_SEQ_MAX(hrorig->hr_preqid, preq->preq_id); 1084 1085 /* Data creation and update of forwarding information 1086 * according to Table 11C-8 for originator mesh STA. 1087 */ 1088 metric = preq->preq_metric + ms->ms_pmetric->mpm_metric(ni); 1089 if (HWMP_SEQ_GT(preq->preq_origseq, hrorig->hr_seq) || 1090 (HWMP_SEQ_EQ(preq->preq_origseq, hrorig->hr_seq) && 1091 metric < rtorig->rt_metric)) { 1092 hrorig->hr_seq = preq->preq_origseq; 1093 IEEE80211_ADDR_COPY(rtorig->rt_nexthop, wh->i_addr2); 1094 rtorig->rt_metric = metric; 1095 rtorig->rt_nhops = preq->preq_hopcount + 1; 1096 ieee80211_mesh_rt_update(rtorig, preq->preq_lifetime); 1097 /* Path to orig is valid now. 1098 * NB: we know it can't be Proxy, and if it is GATE 1099 * it will be marked below. 1100 */ 1101 rtorig->rt_flags = IEEE80211_MESHRT_FLAGS_VALID; 1102 } else if ((hrtarg != NULL && 1103 !HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0))) || 1104 (rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1105 preqid >= preq->preq_id)) { 1106 #if defined(__DragonFly__) 1107 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1108 "discard PREQ from %s, old seqno %u <= %u," 1109 " or old preqid %u < %u", 1110 ether_sprintf(preq->preq_origaddr), 1111 preq->preq_origseq, hrorig->hr_seq, 1112 preq->preq_id, preqid); 1113 #else 1114 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1115 "discard PREQ from %6D, old seqno %u <= %u," 1116 " or old preqid %u < %u", 1117 preq->preq_origaddr, ":", 1118 preq->preq_origseq, hrorig->hr_seq, 1119 preq->preq_id, preqid); 1120 #endif 1121 return; 1122 } 1123 1124 /* Update forwarding information to TA if metric improves. */ 1125 hwmp_update_transmitter(vap, ni, "PREQ"); 1126 1127 /* 1128 * Check if the PREQ is addressed to us. 1129 * or a Proxy currently gated by us. 1130 */ 1131 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) || 1132 (ms->ms_flags & IEEE80211_MESHFLAGS_GATE && 1133 rttarg != NULL && 1134 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate) && 1135 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY && 1136 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 1137 /* 1138 * When we are the target we shall update our own HWMP seq 1139 * number with max of (current and preq->seq) + 1 1140 */ 1141 hs->hs_seq = HWMP_SEQ_MAX(hs->hs_seq, PREQ_TSEQ(0)) + 1; 1142 1143 prep.prep_flags = 0; 1144 prep.prep_hopcount = 0; 1145 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1146 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr); 1147 if (rttarg != NULL && /* if NULL it means we are the target */ 1148 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1149 #if defined(__DragonFly__) 1150 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1151 "reply for proxy %s", 1152 ether_sprintf(rttarg->rt_dest)); 1153 #else 1154 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1155 "reply for proxy %6D", rttarg->rt_dest, ":"); 1156 #endif 1157 prep.prep_flags |= IEEE80211_MESHPREP_FLAGS_AE; 1158 IEEE80211_ADDR_COPY(prep.prep_target_ext_addr, 1159 rttarg->rt_dest); 1160 /* update proxy seqno to HWMP seqno */ 1161 rttarg->rt_ext_seq = hs->hs_seq; 1162 prep.prep_hopcount = rttarg->rt_nhops; 1163 prep.prep_metric = rttarg->rt_metric; 1164 IEEE80211_ADDR_COPY(prep.prep_targetaddr, rttarg->rt_mesh_gate); 1165 } 1166 /* 1167 * Build and send a PREP frame. 1168 */ 1169 prep.prep_ttl = ms->ms_ttl; 1170 prep.prep_targetseq = hs->hs_seq; 1171 prep.prep_lifetime = preq->preq_lifetime; 1172 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr); 1173 prep.prep_origseq = preq->preq_origseq; 1174 1175 #if defined(__DragonFly__) 1176 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1177 "reply to %s", ether_sprintf(preq->preq_origaddr)); 1178 #else 1179 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1180 "reply to %6D", preq->preq_origaddr, ":"); 1181 #endif 1182 hwmp_send_prep(vap, wh->i_addr2, &prep); 1183 return; 1184 } 1185 /* we may update our proxy information for the orig external */ 1186 else if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) { 1187 rtorig_ext = 1188 ieee80211_mesh_rt_find(vap, preq->preq_orig_ext_addr); 1189 if (rtorig_ext == NULL) { 1190 rtorig_ext = ieee80211_mesh_rt_add(vap, 1191 preq->preq_orig_ext_addr); 1192 if (rtorig_ext == NULL) { 1193 #if defined(__DragonFly__) 1194 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1195 "unable to add orig ext proxy to %s", 1196 ether_sprintf(preq->preq_orig_ext_addr)); 1197 #else 1198 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1199 "unable to add orig ext proxy to %6D", 1200 preq->preq_orig_ext_addr, ":"); 1201 #endif 1202 vap->iv_stats.is_mesh_rtaddfailed++; 1203 return; 1204 } 1205 IEEE80211_ADDR_COPY(rtorig_ext->rt_mesh_gate, 1206 preq->preq_origaddr); 1207 } 1208 rtorig_ext->rt_ext_seq = preq->preq_origseq; 1209 ieee80211_mesh_rt_update(rtorig_ext, preq->preq_lifetime); 1210 } 1211 /* 1212 * Proactive PREQ: reply with a proactive PREP to the 1213 * root STA if requested. 1214 */ 1215 if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) && 1216 (PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) { 1217 #if defined(__DragonFly__) 1218 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1219 "root mesh station @ %s", 1220 ether_sprintf(preq->preq_origaddr)); 1221 #else 1222 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1223 "root mesh station @ %6D", preq->preq_origaddr, ":"); 1224 #endif 1225 1226 /* Check if root is a mesh gate, mark it */ 1227 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_GATE) { 1228 struct ieee80211_mesh_gate_route *gr; 1229 1230 rtorig->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE; 1231 gr = ieee80211_mesh_mark_gate(vap, preq->preq_origaddr, 1232 rtorig); 1233 gr->gr_lastseq = 0; /* NOT GANN */ 1234 } 1235 1236 /* 1237 * Reply with a PREP if we don't have a path to the root 1238 * or if the root sent us a proactive PREQ. 1239 */ 1240 if ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 || 1241 (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) { 1242 prep.prep_flags = 0; 1243 prep.prep_hopcount = 0; 1244 prep.prep_ttl = ms->ms_ttl; 1245 IEEE80211_ADDR_COPY(prep.prep_origaddr, 1246 preq->preq_origaddr); 1247 prep.prep_origseq = preq->preq_origseq; 1248 prep.prep_lifetime = preq->preq_lifetime; 1249 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1250 IEEE80211_ADDR_COPY(prep.prep_targetaddr, 1251 vap->iv_myaddr); 1252 prep.prep_targetseq = ++hs->hs_seq; 1253 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep); 1254 } 1255 } 1256 1257 /* 1258 * Forwarding and Intermediate reply for PREQs with 1 target. 1259 */ 1260 if ((preq->preq_tcount == 1) && (preq->preq_ttl > 1) && 1261 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) { 1262 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */ 1263 1264 memcpy(&ppreq, preq, sizeof(ppreq)); 1265 1266 /* 1267 * We have a valid route to this node. 1268 * NB: if target is proxy dont reply. 1269 */ 1270 if (rttarg != NULL && 1271 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 1272 !(rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)) { 1273 /* 1274 * Check if we can send an intermediate Path Reply, 1275 * i.e., Target Only bit is not set and target is not 1276 * the MAC broadcast address. 1277 */ 1278 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO) && 1279 !IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr)) { 1280 struct ieee80211_meshprep_ie prep; 1281 1282 #if defined(__DragonFly__) 1283 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1284 "intermediate reply for PREQ from %s", 1285 ether_sprintf(preq->preq_origaddr)); 1286 #else 1287 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1288 "intermediate reply for PREQ from %6D", 1289 preq->preq_origaddr, ":"); 1290 #endif 1291 prep.prep_flags = 0; 1292 prep.prep_hopcount = rttarg->rt_nhops; 1293 prep.prep_ttl = ms->ms_ttl; 1294 IEEE80211_ADDR_COPY(&prep.prep_targetaddr, 1295 PREQ_TADDR(0)); 1296 prep.prep_targetseq = hrtarg->hr_seq; 1297 prep.prep_lifetime = preq->preq_lifetime; 1298 prep.prep_metric =rttarg->rt_metric; 1299 IEEE80211_ADDR_COPY(&prep.prep_origaddr, 1300 preq->preq_origaddr); 1301 prep.prep_origseq = hrorig->hr_seq; 1302 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep); 1303 1304 /* 1305 * Set TO and unset RF bits because we have 1306 * sent a PREP. 1307 */ 1308 ppreq.preq_targets[0].target_flags |= 1309 IEEE80211_MESHPREQ_TFLAGS_TO; 1310 } 1311 } 1312 1313 #if defined(__DragonFly__) 1314 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1315 "forward PREQ from %s", 1316 ether_sprintf(preq->preq_origaddr)); 1317 #else 1318 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1319 "forward PREQ from %6D", 1320 preq->preq_origaddr, ":"); 1321 #endif 1322 ppreq.preq_hopcount += 1; 1323 ppreq.preq_ttl -= 1; 1324 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni); 1325 1326 /* don't do PREQ ratecheck when we propagate */ 1327 hwmp_send_preq(vap, broadcastaddr, &ppreq, NULL, NULL); 1328 } 1329 } 1330 #undef PREQ_TFLAGS 1331 #undef PREQ_TADDR 1332 #undef PREQ_TSEQ 1333 1334 static int 1335 hwmp_send_preq(struct ieee80211vap *vap, 1336 const uint8_t da[IEEE80211_ADDR_LEN], 1337 struct ieee80211_meshpreq_ie *preq, 1338 struct timeval *last, struct timeval *minint) 1339 { 1340 1341 /* 1342 * Enforce PREQ interval. 1343 * NB: Proactive ROOT PREQs rate is handled by cb task. 1344 */ 1345 if (last != NULL && minint != NULL) { 1346 if (ratecheck(last, minint) == 0) 1347 return EALREADY; /* XXX: we should postpone */ 1348 getmicrouptime(last); 1349 } 1350 1351 /* 1352 * mesh preq action frame format 1353 * [6] da 1354 * [6] sa 1355 * [6] addr3 = sa 1356 * [1] action 1357 * [1] category 1358 * [tlv] mesh path request 1359 */ 1360 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ; 1361 preq->preq_len = (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE ? 1362 IEEE80211_MESHPREQ_BASE_SZ_AE : IEEE80211_MESHPREQ_BASE_SZ) + 1363 preq->preq_tcount * IEEE80211_MESHPREQ_TRGT_SZ; 1364 return hwmp_send_action(vap, da, (uint8_t *)preq, preq->preq_len+2); 1365 } 1366 1367 static void 1368 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni, 1369 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep) 1370 { 1371 #define IS_PROXY(rt) (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) 1372 #define PROXIED_BY_US(rt) \ 1373 (IEEE80211_ADDR_EQ(vap->iv_myaddr, rt->rt_mesh_gate)) 1374 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1375 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1376 struct ieee80211_mesh_route *rt = NULL; 1377 struct ieee80211_mesh_route *rtorig = NULL; 1378 struct ieee80211_mesh_route *rtext = NULL; 1379 struct ieee80211_hwmp_route *hr; 1380 struct ieee80211com *ic = vap->iv_ic; 1381 struct mbuf *m, *next; 1382 uint32_t metric = 0; 1383 const uint8_t *addr; 1384 1385 #if defined(__DragonFly__) 1386 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1387 "received PREP, orig %s, targ %s", 1388 ether_sprintf(prep->prep_origaddr), 1389 ether_sprintf(prep->prep_targetaddr)); 1390 #else 1391 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1392 "received PREP, orig %6D, targ %6D", prep->prep_origaddr, ":", 1393 prep->prep_targetaddr, ":"); 1394 #endif 1395 1396 /* 1397 * Acceptance criteria: (If the corresponding PREP was not generated 1398 * by us OR not generated by an external mac that is not proxied by us) 1399 * AND forwarding is disabled, discard this PREP. 1400 */ 1401 rtorig = ieee80211_mesh_rt_find(vap, prep->prep_origaddr); 1402 if ((!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) || 1403 (rtorig != NULL && IS_PROXY(rtorig) && !PROXIED_BY_US(rtorig))) && 1404 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)){ 1405 #if defined(__DragonFly__) 1406 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1407 "discard PREP, orig(%s) not proxied or generated by us", 1408 ether_sprintf(prep->prep_origaddr)); 1409 #else 1410 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1411 "discard PREP, orig(%6D) not proxied or generated by us", 1412 prep->prep_origaddr, ":"); 1413 #endif 1414 return; 1415 } 1416 1417 /* PREP ACCEPTED */ 1418 1419 /* 1420 * If accepted shall create or update the active forwarding information 1421 * it maintains for the target mesh STA of the PREP (according to the 1422 * rules defined in 13.10.8.4). If the conditions for creating or 1423 * updating the forwarding information have not been met in those 1424 * rules, no further steps are applied to the PREP. 1425 */ 1426 rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr); 1427 if (rt == NULL) { 1428 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr); 1429 if (rt == NULL) { 1430 #if defined(__DragonFly__) 1431 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1432 "unable to add PREP path to %s", 1433 ether_sprintf(prep->prep_targetaddr)); 1434 #else 1435 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1436 "unable to add PREP path to %6D", 1437 prep->prep_targetaddr, ":"); 1438 #endif 1439 vap->iv_stats.is_mesh_rtaddfailed++; 1440 return; 1441 } 1442 #if defined(__DragonFly__) 1443 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1444 "adding target %s", ether_sprintf(prep->prep_targetaddr)); 1445 #else 1446 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1447 "adding target %6D", prep->prep_targetaddr, ":"); 1448 #endif 1449 } 1450 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1451 /* update path metric */ 1452 metric = prep->prep_metric + ms->ms_pmetric->mpm_metric(ni); 1453 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 1454 if (HWMP_SEQ_LT(prep->prep_targetseq, hr->hr_seq)) { 1455 #if defined(__DragonFly__) 1456 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1457 "discard PREP from %s, old seq no %u < %u", 1458 ether_sprintf(prep->prep_targetaddr), 1459 prep->prep_targetseq, hr->hr_seq); 1460 #else 1461 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1462 "discard PREP from %6D, old seq no %u < %u", 1463 prep->prep_targetaddr, ":", 1464 prep->prep_targetseq, hr->hr_seq); 1465 #endif 1466 return; 1467 } else if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq) && 1468 metric > rt->rt_metric) { 1469 #if defined(__DragonFly__) 1470 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1471 "discard PREP from %s, new metric %u > %u", 1472 ether_sprintf(prep->prep_targetaddr), 1473 metric, rt->rt_metric); 1474 #else 1475 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1476 "discard PREP from %6D, new metric %u > %u", 1477 prep->prep_targetaddr, ":", 1478 metric, rt->rt_metric); 1479 #endif 1480 return; 1481 } 1482 } 1483 1484 #if defined(__DragonFly__) 1485 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1486 "%s path to %s, hopcount %d:%d metric %d:%d", 1487 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1488 "prefer" : "update", 1489 ether_sprintf(prep->prep_targetaddr), 1490 rt->rt_nhops, prep->prep_hopcount + 1, 1491 rt->rt_metric, metric); 1492 #else 1493 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1494 "%s path to %6D, hopcount %d:%d metric %d:%d", 1495 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1496 "prefer" : "update", 1497 prep->prep_targetaddr, ":", 1498 rt->rt_nhops, prep->prep_hopcount + 1, 1499 rt->rt_metric, metric); 1500 #endif 1501 1502 hr->hr_seq = prep->prep_targetseq; 1503 hr->hr_preqretries = 0; 1504 IEEE80211_ADDR_COPY(rt->rt_nexthop, ni->ni_macaddr); 1505 rt->rt_metric = metric; 1506 rt->rt_nhops = prep->prep_hopcount + 1; 1507 ieee80211_mesh_rt_update(rt, prep->prep_lifetime); 1508 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) { 1509 /* discovery complete */ 1510 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_DISCOVER; 1511 } 1512 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; /* mark valid */ 1513 1514 /* Update forwarding information to TA if metric improves */ 1515 hwmp_update_transmitter(vap, ni, "PREP"); 1516 1517 /* 1518 * If it's NOT for us, propagate the PREP 1519 */ 1520 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) && 1521 prep->prep_ttl > 1 && 1522 prep->prep_hopcount < hs->hs_maxhops) { 1523 struct ieee80211_meshprep_ie pprep; /* propagated PREP */ 1524 /* 1525 * NB: We should already have setup the path to orig 1526 * mesh STA when we propagated PREQ to target mesh STA, 1527 * no PREP is generated without a corresponding PREQ. 1528 * XXX: for now just ignore. 1529 */ 1530 if (rtorig == NULL) { 1531 #if defined(__DragonFly__) 1532 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1533 "received PREP for an unknown orig(%s)", 1534 ether_sprintf(prep->prep_origaddr)); 1535 #else 1536 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1537 "received PREP for an unknown orig(%6D)", 1538 prep->prep_origaddr, ":"); 1539 #endif 1540 return; 1541 } 1542 1543 #if defined(__DragonFly__) 1544 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1545 "propagate PREP from %s", 1546 ether_sprintf(prep->prep_targetaddr)); 1547 #else 1548 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1549 "propagate PREP from %6D", 1550 prep->prep_targetaddr, ":"); 1551 #endif 1552 1553 memcpy(&pprep, prep, sizeof(pprep)); 1554 pprep.prep_hopcount += 1; 1555 pprep.prep_ttl -= 1; 1556 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni); 1557 hwmp_send_prep(vap, rtorig->rt_nexthop, &pprep); 1558 1559 /* precursor list for the Target Mesh STA Address is updated */ 1560 } 1561 1562 /* 1563 * Check if we received a PREP w/ AE and store target external address. 1564 * We may store target external address if recevied PREP w/ AE 1565 * and we are not final destination 1566 */ 1567 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) { 1568 rtext = ieee80211_mesh_rt_find(vap, 1569 prep->prep_target_ext_addr); 1570 if (rtext == NULL) { 1571 rtext = ieee80211_mesh_rt_add(vap, 1572 prep->prep_target_ext_addr); 1573 if (rtext == NULL) { 1574 #if defined(__DragonFly__) 1575 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1576 "unable to add PREP path to proxy %s", 1577 ether_sprintf(prep->prep_targetaddr)); 1578 #else 1579 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1580 "unable to add PREP path to proxy %6D", 1581 prep->prep_targetaddr, ":"); 1582 #endif 1583 vap->iv_stats.is_mesh_rtaddfailed++; 1584 return; 1585 } 1586 } 1587 #if defined(__DragonFly__) 1588 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1589 "%s path to %s, hopcount %d:%d metric %d:%d", 1590 rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1591 "prefer" : "update", 1592 ether_sprintf(prep->prep_target_ext_addr), 1593 rtext->rt_nhops, prep->prep_hopcount + 1, 1594 rtext->rt_metric, metric); 1595 #else 1596 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1597 "%s path to %6D, hopcount %d:%d metric %d:%d", 1598 rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1599 "prefer" : "update", 1600 prep->prep_target_ext_addr, ":", 1601 rtext->rt_nhops, prep->prep_hopcount + 1, 1602 rtext->rt_metric, metric); 1603 #endif 1604 1605 rtext->rt_flags = IEEE80211_MESHRT_FLAGS_PROXY | 1606 IEEE80211_MESHRT_FLAGS_VALID; 1607 IEEE80211_ADDR_COPY(rtext->rt_dest, 1608 prep->prep_target_ext_addr); 1609 IEEE80211_ADDR_COPY(rtext->rt_mesh_gate, 1610 prep->prep_targetaddr); 1611 IEEE80211_ADDR_COPY(rtext->rt_nexthop, wh->i_addr2); 1612 rtext->rt_metric = metric; 1613 rtext->rt_lifetime = prep->prep_lifetime; 1614 rtext->rt_nhops = prep->prep_hopcount + 1; 1615 rtext->rt_ext_seq = prep->prep_origseq; /* new proxy seq */ 1616 /* 1617 * XXX: proxy entries have no HWMP priv data, 1618 * nullify them to be sure? 1619 */ 1620 } 1621 /* 1622 * Check for frames queued awaiting path discovery. 1623 * XXX probably can tell exactly and avoid remove call 1624 * NB: hash may have false matches, if so they will get 1625 * stuck back on the stageq because there won't be 1626 * a path. 1627 */ 1628 addr = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ? 1629 prep->prep_target_ext_addr : prep->prep_targetaddr; 1630 m = ieee80211_ageq_remove(&ic->ic_stageq, 1631 (struct ieee80211_node *)(uintptr_t) 1632 ieee80211_mac_hash(ic, addr)); /* either dest or ext_dest */ 1633 1634 /* 1635 * All frames in the stageq here should be non-M_ENCAP; or things 1636 * will get very unhappy. 1637 */ 1638 for (; m != NULL; m = next) { 1639 next = m->m_nextpkt; 1640 m->m_nextpkt = NULL; 1641 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1642 "flush queued frame %p len %d", m, m->m_pkthdr.len); 1643 /* 1644 * If the mbuf has M_ENCAP set, ensure we free it. 1645 * Note that after if_transmit() is called, m is invalid. 1646 */ 1647 (void) ieee80211_vap_xmitpkt(vap, m); 1648 } 1649 #undef IS_PROXY 1650 #undef PROXIED_BY_US 1651 } 1652 1653 static int 1654 hwmp_send_prep(struct ieee80211vap *vap, 1655 const uint8_t da[IEEE80211_ADDR_LEN], 1656 struct ieee80211_meshprep_ie *prep) 1657 { 1658 /* NB: there's no PREP minimum interval. */ 1659 1660 /* 1661 * mesh prep action frame format 1662 * [6] da 1663 * [6] sa 1664 * [6] addr3 = sa 1665 * [1] action 1666 * [1] category 1667 * [tlv] mesh path reply 1668 */ 1669 prep->prep_ie = IEEE80211_ELEMID_MESHPREP; 1670 prep->prep_len = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ? 1671 IEEE80211_MESHPREP_BASE_SZ_AE : IEEE80211_MESHPREP_BASE_SZ; 1672 return hwmp_send_action(vap, da, (uint8_t *)prep, prep->prep_len + 2); 1673 } 1674 1675 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1676 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1677 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1678 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1679 static void 1680 hwmp_peerdown(struct ieee80211_node *ni) 1681 { 1682 struct ieee80211vap *vap = ni->ni_vap; 1683 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1684 struct ieee80211_meshperr_ie perr; 1685 struct ieee80211_mesh_route *rt; 1686 struct ieee80211_hwmp_route *hr; 1687 1688 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr); 1689 if (rt == NULL) 1690 return; 1691 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1692 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1693 "%s", "delete route entry"); 1694 perr.perr_ttl = ms->ms_ttl; 1695 perr.perr_ndests = 1; 1696 PERR_DFLAGS(0) = 0; 1697 if (hr->hr_seq == 0) 1698 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN; 1699 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC; 1700 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest); 1701 PERR_DSEQ(0) = ++hr->hr_seq; 1702 PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH; 1703 /* NB: flush everything passing through peer */ 1704 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr); 1705 hwmp_send_perr(vap, broadcastaddr, &perr); 1706 } 1707 #undef PERR_DFLAGS 1708 #undef PERR_DADDR 1709 #undef PERR_DSEQ 1710 #undef PERR_DRCODE 1711 1712 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags 1713 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr 1714 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 1715 #define PERR_DEXTADDR(n) perr->perr_dests[n].dest_ext_addr 1716 #define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode 1717 static void 1718 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni, 1719 const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr) 1720 { 1721 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1722 struct ieee80211_mesh_route *rt = NULL; 1723 struct ieee80211_mesh_route *rt_ext = NULL; 1724 struct ieee80211_hwmp_route *hr; 1725 struct ieee80211_meshperr_ie *pperr = NULL; 1726 int i, j = 0, forward = 0; 1727 1728 #if defined(__DragonFly__) 1729 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1730 "received PERR from %s", ether_sprintf(wh->i_addr2)); 1731 #else 1732 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1733 "received PERR from %6D", wh->i_addr2, ":"); 1734 #endif 1735 1736 /* 1737 * if forwarding is true, prepare pperr 1738 */ 1739 if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) { 1740 forward = 1; 1741 #if defined(__DragonFly__) 1742 pperr = kmalloc(sizeof(*perr) + 31*sizeof(*perr->perr_dests), 1743 M_80211_MESH_PERR, M_INTWAIT); /* XXX: magic number, 32 err dests */ 1744 #else 1745 pperr = IEEE80211_MALLOC(sizeof(*perr) + 31*sizeof(*perr->perr_dests), 1746 M_80211_MESH_PERR, IEEE80211_M_NOWAIT); /* XXX: magic number, 32 err dests */ 1747 #endif 1748 } 1749 1750 /* 1751 * Acceptance criteria: check if we have forwarding information 1752 * stored about destination, and that nexthop == TA of this PERR. 1753 * NB: we also build a new PERR to propagate in case we should forward. 1754 */ 1755 for (i = 0; i < perr->perr_ndests; i++) { 1756 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i)); 1757 if (rt == NULL) 1758 continue; 1759 if (!IEEE80211_ADDR_EQ(rt->rt_nexthop, wh->i_addr2)) 1760 continue; 1761 1762 /* found and accepted a PERR ndest element, process it... */ 1763 if (forward) 1764 memcpy(&pperr->perr_dests[j], &perr->perr_dests[i], 1765 sizeof(*perr->perr_dests)); 1766 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1767 switch(PERR_DFLAGS(i)) { 1768 case (IEEE80211_REASON_MESH_PERR_NO_FI): 1769 if (PERR_DSEQ(i) == 0) { 1770 hr->hr_seq++; 1771 if (forward) { 1772 pperr->perr_dests[j].dest_seq = 1773 hr->hr_seq; 1774 } 1775 } else { 1776 hr->hr_seq = PERR_DSEQ(i); 1777 } 1778 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID; 1779 j++; 1780 break; 1781 case (IEEE80211_REASON_MESH_PERR_DEST_UNREACH): 1782 if(HWMP_SEQ_GT(PERR_DSEQ(i), hr->hr_seq)) { 1783 hr->hr_seq = PERR_DSEQ(i); 1784 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID; 1785 j++; 1786 } 1787 break; 1788 case (IEEE80211_REASON_MESH_PERR_NO_PROXY): 1789 rt_ext = ieee80211_mesh_rt_find(vap, PERR_DEXTADDR(i)); 1790 if (rt_ext != NULL) { 1791 rt_ext->rt_flags &= 1792 ~IEEE80211_MESHRT_FLAGS_VALID; 1793 j++; 1794 } 1795 break; 1796 default: 1797 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1798 "PERR, unknown reason code %u\n", PERR_DFLAGS(i)); 1799 goto done; /* XXX: stats?? */ 1800 } 1801 ieee80211_mesh_rt_flush_peer(vap, PERR_DADDR(i)); 1802 KASSERT(j < 32, ("PERR, error ndest >= 32 (%u)", j)); 1803 } 1804 if (j == 0) { 1805 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, "%s", 1806 "PERR not accepted"); 1807 goto done; /* XXX: stats?? */ 1808 } 1809 1810 /* 1811 * Propagate the PERR if we previously found it on our routing table. 1812 */ 1813 if (forward && perr->perr_ttl > 1) { 1814 #if defined(__DragonFly__) 1815 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1816 "propagate PERR from %s", ether_sprintf(wh->i_addr2)); 1817 #else 1818 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1819 "propagate PERR from %6D", wh->i_addr2, ":"); 1820 #endif 1821 pperr->perr_ndests = j; 1822 pperr->perr_ttl--; 1823 hwmp_send_perr(vap, broadcastaddr, pperr); 1824 } 1825 done: 1826 if (pperr != NULL) 1827 IEEE80211_FREE(pperr, M_80211_MESH_PERR); 1828 } 1829 #undef PERR_DFLAGS 1830 #undef PERR_DADDR 1831 #undef PERR_DSEQ 1832 #undef PERR_DEXTADDR 1833 #undef PERR_DRCODE 1834 1835 static int 1836 hwmp_send_perr(struct ieee80211vap *vap, 1837 const uint8_t da[IEEE80211_ADDR_LEN], 1838 struct ieee80211_meshperr_ie *perr) 1839 { 1840 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1841 int i; 1842 uint8_t length = 0; 1843 1844 /* 1845 * Enforce PERR interval. 1846 */ 1847 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0) 1848 return EALREADY; 1849 getmicrouptime(&hs->hs_lastperr); 1850 1851 /* 1852 * mesh perr action frame format 1853 * [6] da 1854 * [6] sa 1855 * [6] addr3 = sa 1856 * [1] action 1857 * [1] category 1858 * [tlv] mesh path error 1859 */ 1860 perr->perr_ie = IEEE80211_ELEMID_MESHPERR; 1861 length = IEEE80211_MESHPERR_BASE_SZ; 1862 for (i = 0; i<perr->perr_ndests; i++) { 1863 if (perr->perr_dests[i].dest_flags & 1864 IEEE80211_MESHPERR_FLAGS_AE) { 1865 length += IEEE80211_MESHPERR_DEST_SZ_AE; 1866 continue ; 1867 } 1868 length += IEEE80211_MESHPERR_DEST_SZ; 1869 } 1870 perr->perr_len =length; 1871 return hwmp_send_action(vap, da, (uint8_t *)perr, perr->perr_len+2); 1872 } 1873 1874 /* 1875 * Called from the rest of the net80211 code (mesh code for example). 1876 * NB: IEEE80211_REASON_MESH_PERR_DEST_UNREACH can be trigger by the fact that 1877 * a mesh STA is unable to forward an MSDU/MMPDU to a next-hop mesh STA. 1878 */ 1879 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags 1880 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1881 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1882 #define PERR_DEXTADDR(n) perr.perr_dests[n].dest_ext_addr 1883 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode 1884 static void 1885 hwmp_senderror(struct ieee80211vap *vap, 1886 const uint8_t addr[IEEE80211_ADDR_LEN], 1887 struct ieee80211_mesh_route *rt, int rcode) 1888 { 1889 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1890 struct ieee80211_hwmp_route *hr = NULL; 1891 struct ieee80211_meshperr_ie perr; 1892 1893 if (rt != NULL) 1894 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1895 struct ieee80211_hwmp_route); 1896 1897 perr.perr_ndests = 1; 1898 perr.perr_ttl = ms->ms_ttl; 1899 PERR_DFLAGS(0) = 0; 1900 PERR_DRCODE(0) = rcode; 1901 1902 switch (rcode) { 1903 case IEEE80211_REASON_MESH_PERR_NO_FI: 1904 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr); 1905 PERR_DSEQ(0) = 0; /* reserved */ 1906 break; 1907 case IEEE80211_REASON_MESH_PERR_NO_PROXY: 1908 KASSERT(rt != NULL, ("no proxy info for sending PERR")); 1909 KASSERT(rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY, 1910 ("route is not marked proxy")); 1911 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_FLAGS_AE; 1912 IEEE80211_ADDR_COPY(PERR_DADDR(0), vap->iv_myaddr); 1913 PERR_DSEQ(0) = rt->rt_ext_seq; 1914 IEEE80211_ADDR_COPY(PERR_DEXTADDR(0), addr); 1915 break; 1916 case IEEE80211_REASON_MESH_PERR_DEST_UNREACH: 1917 KASSERT(rt != NULL, ("no route info for sending PERR")); 1918 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr); 1919 PERR_DSEQ(0) = hr->hr_seq; 1920 break; 1921 default: 1922 KASSERT(0, ("unknown reason code for HWMP PERR (%u)", rcode)); 1923 } 1924 hwmp_send_perr(vap, broadcastaddr, &perr); 1925 } 1926 #undef PERR_DFLAGS 1927 #undef PEER_DADDR 1928 #undef PERR_DSEQ 1929 #undef PERR_DEXTADDR 1930 #undef PERR_DRCODE 1931 1932 static void 1933 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni, 1934 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann) 1935 { 1936 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1937 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1938 struct ieee80211_mesh_route *rt = NULL; 1939 struct ieee80211_hwmp_route *hr; 1940 struct ieee80211_meshpreq_ie preq; 1941 struct ieee80211_meshrann_ie prann; 1942 uint32_t metric = 0; 1943 1944 if (IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr)) 1945 return; 1946 1947 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr); 1948 if (rt != NULL && rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) { 1949 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1950 1951 /* Acceptance criteria: if RANN.seq < stored seq, discard RANN */ 1952 if (HWMP_SEQ_LT(rann->rann_seq, hr->hr_seq)) { 1953 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1954 "RANN seq %u < %u", rann->rann_seq, hr->hr_seq); 1955 return; 1956 } 1957 1958 /* Acceptance criteria: if RANN.seq == stored seq AND 1959 * RANN.metric > stored metric, discard RANN */ 1960 if (HWMP_SEQ_EQ(rann->rann_seq, hr->hr_seq) && 1961 rann->rann_metric > rt->rt_metric) { 1962 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1963 "RANN metric %u > %u", rann->rann_metric, rt->rt_metric); 1964 return; 1965 } 1966 } 1967 1968 /* RANN ACCEPTED */ 1969 1970 ieee80211_hwmp_rannint = rann->rann_interval; /* XXX: mtx lock? */ 1971 metric = rann->rann_metric + ms->ms_pmetric->mpm_metric(ni); 1972 1973 if (rt == NULL) { 1974 rt = ieee80211_mesh_rt_add(vap, rann->rann_addr); 1975 if (rt == NULL) { 1976 #if defined(__DragonFly__) 1977 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1978 "unable to add mac for RANN root %s", 1979 ether_sprintf(rann->rann_addr)); 1980 #else 1981 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, 1982 "unable to add mac for RANN root %6D", 1983 rann->rann_addr, ":"); 1984 #endif 1985 vap->iv_stats.is_mesh_rtaddfailed++; 1986 return; 1987 } 1988 } 1989 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1990 /* Check if root is a mesh gate, mark it */ 1991 if (rann->rann_flags & IEEE80211_MESHRANN_FLAGS_GATE) { 1992 struct ieee80211_mesh_gate_route *gr; 1993 1994 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE; 1995 gr = ieee80211_mesh_mark_gate(vap, rann->rann_addr, 1996 rt); 1997 gr->gr_lastseq = 0; /* NOT GANN */ 1998 } 1999 /* discovery timeout */ 2000 ieee80211_mesh_rt_update(rt, 2001 ticks_to_msecs(ieee80211_hwmp_roottimeout)); 2002 2003 preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM; 2004 preq.preq_hopcount = 0; 2005 preq.preq_ttl = ms->ms_ttl; 2006 preq.preq_id = 0; /* reserved */ 2007 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 2008 preq.preq_origseq = ++hs->hs_seq; 2009 preq.preq_lifetime = ieee80211_hwmp_roottimeout; 2010 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 2011 preq.preq_tcount = 1; 2012 preq.preq_targets[0].target_flags = IEEE80211_MESHPREQ_TFLAGS_TO; 2013 /* NB: IEEE80211_MESHPREQ_TFLAGS_USN = 0 implicitly implied */ 2014 IEEE80211_ADDR_COPY(preq.preq_targets[0].target_addr, rann->rann_addr); 2015 preq.preq_targets[0].target_seq = rann->rann_seq; 2016 /* XXX: if rootconfint have not passed, we built this preq in vain */ 2017 hwmp_send_preq(vap, wh->i_addr2, &preq, &hr->hr_lastrootconf, 2018 &ieee80211_hwmp_rootconfint); 2019 2020 /* propagate a RANN */ 2021 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID && 2022 rann->rann_ttl > 1 && 2023 ms->ms_flags & IEEE80211_MESHFLAGS_FWD) { 2024 hr->hr_seq = rann->rann_seq; 2025 memcpy(&prann, rann, sizeof(prann)); 2026 prann.rann_hopcount += 1; 2027 prann.rann_ttl -= 1; 2028 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni); 2029 hwmp_send_rann(vap, broadcastaddr, &prann); 2030 } 2031 } 2032 2033 static int 2034 hwmp_send_rann(struct ieee80211vap *vap, 2035 const uint8_t da[IEEE80211_ADDR_LEN], 2036 struct ieee80211_meshrann_ie *rann) 2037 { 2038 /* 2039 * mesh rann action frame format 2040 * [6] da 2041 * [6] sa 2042 * [6] addr3 = sa 2043 * [1] action 2044 * [1] category 2045 * [tlv] root annoucement 2046 */ 2047 rann->rann_ie = IEEE80211_ELEMID_MESHRANN; 2048 rann->rann_len = IEEE80211_MESHRANN_BASE_SZ; 2049 return hwmp_send_action(vap, da, (uint8_t *)rann, rann->rann_len + 2); 2050 } 2051 2052 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 2053 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr 2054 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 2055 static void 2056 hwmp_rediscover_cb(void *arg) 2057 { 2058 struct ieee80211_mesh_route *rt = arg; 2059 struct ieee80211vap *vap = rt->rt_vap; 2060 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 2061 struct ieee80211_mesh_state *ms = vap->iv_mesh; 2062 struct ieee80211_hwmp_route *hr; 2063 struct ieee80211_meshpreq_ie preq; /* Optimize: storing first preq? */ 2064 2065 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) 2066 return ; /* nothing to do */ 2067 2068 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 2069 if (hr->hr_preqretries >= 2070 ieee80211_hwmp_maxpreq_retries) { 2071 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, 2072 rt->rt_dest, "%s", 2073 "max number of discovery, send queued frames to GATE"); 2074 ieee80211_mesh_forward_to_gates(vap, rt); 2075 vap->iv_stats.is_mesh_fwd_nopath++; 2076 return ; /* XXX: flush queue? */ 2077 } 2078 2079 hr->hr_preqretries++; 2080 2081 2082 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, rt->rt_dest, 2083 "start path rediscovery , target seq %u", hr->hr_seq); 2084 /* 2085 * Try to discover the path for this node. 2086 * Group addressed PREQ Case A 2087 */ 2088 preq.preq_flags = 0; 2089 preq.preq_hopcount = 0; 2090 preq.preq_ttl = ms->ms_ttl; 2091 preq.preq_id = ++hs->hs_preqid; 2092 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 2093 preq.preq_origseq = hr->hr_origseq; 2094 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_pathtimeout); 2095 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 2096 preq.preq_tcount = 1; 2097 IEEE80211_ADDR_COPY(PREQ_TADDR(0), rt->rt_dest); 2098 PREQ_TFLAGS(0) = 0; 2099 if (ieee80211_hwmp_targetonly) 2100 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 2101 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 2102 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */ 2103 /* XXX check return value */ 2104 hwmp_send_preq(vap, broadcastaddr, &preq, &hr->hr_lastpreq, 2105 &ieee80211_hwmp_preqminint); 2106 callout_reset(&rt->rt_discovery, 2107 ieee80211_hwmp_net_diameter_traversaltime * 2, 2108 hwmp_rediscover_cb, rt); 2109 } 2110 2111 static struct ieee80211_node * 2112 hwmp_discover(struct ieee80211vap *vap, 2113 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m) 2114 { 2115 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 2116 struct ieee80211_mesh_state *ms = vap->iv_mesh; 2117 struct ieee80211_mesh_route *rt = NULL; 2118 struct ieee80211_hwmp_route *hr; 2119 struct ieee80211_meshpreq_ie preq; 2120 struct ieee80211_node *ni; 2121 int sendpreq = 0; 2122 2123 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 2124 ("not a mesh vap, opmode %d", vap->iv_opmode)); 2125 2126 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest), 2127 ("%s: discovering self!", __func__)); 2128 2129 ni = NULL; 2130 if (!IEEE80211_IS_MULTICAST(dest)) { 2131 rt = ieee80211_mesh_rt_find(vap, dest); 2132 if (rt == NULL) { 2133 rt = ieee80211_mesh_rt_add(vap, dest); 2134 if (rt == NULL) { 2135 #if defined(__DragonFly__) 2136 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 2137 ni, "unable to add discovery path to %s", 2138 ether_sprintf(dest)); 2139 #else 2140 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 2141 ni, "unable to add discovery path to %6D", 2142 dest, ":"); 2143 #endif 2144 vap->iv_stats.is_mesh_rtaddfailed++; 2145 goto done; 2146 } 2147 } 2148 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 2149 struct ieee80211_hwmp_route); 2150 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) { 2151 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 2152 "%s", "already discovering queue frame until path found"); 2153 sendpreq = 1; 2154 goto done; 2155 } 2156 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) { 2157 if (hr->hr_lastdiscovery != 0 && 2158 (ticks - hr->hr_lastdiscovery < 2159 (ieee80211_hwmp_net_diameter_traversaltime * 2))) { 2160 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 2161 dest, NULL, "%s", 2162 "too frequent discovery requeust"); 2163 sendpreq = 1; 2164 goto done; 2165 } 2166 hr->hr_lastdiscovery = ticks; 2167 if (hr->hr_preqretries >= 2168 ieee80211_hwmp_maxpreq_retries) { 2169 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 2170 dest, NULL, "%s", 2171 "no valid path , max number of discovery"); 2172 vap->iv_stats.is_mesh_fwd_nopath++; 2173 goto done; 2174 } 2175 rt->rt_flags = IEEE80211_MESHRT_FLAGS_DISCOVER; 2176 hr->hr_preqretries++; 2177 if (hr->hr_origseq == 0) 2178 hr->hr_origseq = ++hs->hs_seq; 2179 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 2180 sendpreq = 1; 2181 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 2182 "start path discovery (src %s), target seq %u", 2183 m == NULL ? "<none>" : ether_sprintf( 2184 mtod(m, struct ether_header *)->ether_shost), 2185 hr->hr_seq); 2186 /* 2187 * Try to discover the path for this node. 2188 * Group addressed PREQ Case A 2189 */ 2190 preq.preq_flags = 0; 2191 preq.preq_hopcount = 0; 2192 preq.preq_ttl = ms->ms_ttl; 2193 preq.preq_id = ++hs->hs_preqid; 2194 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 2195 preq.preq_origseq = hr->hr_origseq; 2196 preq.preq_lifetime = 2197 ticks_to_msecs(ieee80211_hwmp_pathtimeout); 2198 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 2199 preq.preq_tcount = 1; 2200 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest); 2201 PREQ_TFLAGS(0) = 0; 2202 if (ieee80211_hwmp_targetonly) 2203 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 2204 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 2205 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */ 2206 /* XXX check return value */ 2207 hwmp_send_preq(vap, broadcastaddr, &preq, 2208 &hr->hr_lastpreq, &ieee80211_hwmp_preqminint); 2209 callout_reset(&rt->rt_discovery, 2210 ieee80211_hwmp_net_diameter_traversaltime * 2, 2211 hwmp_rediscover_cb, rt); 2212 } 2213 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) 2214 ni = ieee80211_find_txnode(vap, rt->rt_nexthop); 2215 } else { 2216 ni = ieee80211_find_txnode(vap, dest); 2217 /* NB: if null then we leak mbuf */ 2218 KASSERT(ni != NULL, ("leak mcast frame")); 2219 return ni; 2220 } 2221 done: 2222 if (ni == NULL && m != NULL) { 2223 if (sendpreq) { 2224 struct ieee80211com *ic = vap->iv_ic; 2225 /* 2226 * Queue packet for transmit when path discovery 2227 * completes. If discovery never completes the 2228 * frame will be flushed by way of the aging timer. 2229 */ 2230 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 2231 "%s", "queue frame until path found"); 2232 m->m_pkthdr.rcvif = (void *)(uintptr_t) 2233 ieee80211_mac_hash(ic, dest); 2234 /* XXX age chosen randomly */ 2235 ieee80211_ageq_append(&ic->ic_stageq, m, 2236 IEEE80211_INACT_WAIT); 2237 } else { 2238 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 2239 dest, NULL, "%s", "no valid path to this node"); 2240 m_freem(m); 2241 } 2242 } 2243 return ni; 2244 } 2245 #undef PREQ_TFLAGS 2246 #undef PREQ_TADDR 2247 #undef PREQ_TSEQ 2248 2249 static int 2250 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 2251 { 2252 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 2253 int error; 2254 2255 if (vap->iv_opmode != IEEE80211_M_MBSS) 2256 return ENOSYS; 2257 error = 0; 2258 switch (ireq->i_type) { 2259 case IEEE80211_IOC_HWMP_ROOTMODE: 2260 ireq->i_val = hs->hs_rootmode; 2261 break; 2262 case IEEE80211_IOC_HWMP_MAXHOPS: 2263 ireq->i_val = hs->hs_maxhops; 2264 break; 2265 default: 2266 return ENOSYS; 2267 } 2268 return error; 2269 } 2270 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211); 2271 2272 static int 2273 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 2274 { 2275 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 2276 int error; 2277 2278 if (vap->iv_opmode != IEEE80211_M_MBSS) 2279 return ENOSYS; 2280 error = 0; 2281 switch (ireq->i_type) { 2282 case IEEE80211_IOC_HWMP_ROOTMODE: 2283 if (ireq->i_val < 0 || ireq->i_val > 3) 2284 return EINVAL; 2285 hs->hs_rootmode = ireq->i_val; 2286 hwmp_rootmode_setup(vap); 2287 break; 2288 case IEEE80211_IOC_HWMP_MAXHOPS: 2289 if (ireq->i_val <= 0 || ireq->i_val > 255) 2290 return EINVAL; 2291 hs->hs_maxhops = ireq->i_val; 2292 break; 2293 default: 2294 return ENOSYS; 2295 } 2296 return error; 2297 } 2298 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211); 2299