ieee80211_hwmp.c revision 195908
1/*- 2 * Copyright (c) 2009 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Rui Paulo under sponsorship from the 6 * FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29#include <sys/cdefs.h> 30#ifdef __FreeBSD__ 31__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_hwmp.c 195908 2009-07-27 14:22:09Z rpaulo $"); 32#endif 33 34/* 35 * IEEE 802.11s Hybrid Wireless Mesh Protocol, HWMP. 36 * 37 * Based on March 2009, D3.0 802.11s draft spec. 38 */ 39#include "opt_inet.h" 40#include "opt_wlan.h" 41 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/mbuf.h> 45#include <sys/malloc.h> 46#include <sys/kernel.h> 47 48#include <sys/socket.h> 49#include <sys/sockio.h> 50#include <sys/endian.h> 51#include <sys/errno.h> 52#include <sys/proc.h> 53#include <sys/sysctl.h> 54 55#include <net/if.h> 56#include <net/if_media.h> 57#include <net/if_llc.h> 58#include <net/ethernet.h> 59 60#include <net/bpf.h> 61 62#include <net80211/ieee80211_var.h> 63#include <net80211/ieee80211_action.h> 64#include <net80211/ieee80211_input.h> 65#include <net80211/ieee80211_mesh.h> 66 67static void hwmp_vattach(struct ieee80211vap *); 68static void hwmp_vdetach(struct ieee80211vap *); 69static int hwmp_newstate(struct ieee80211vap *, 70 enum ieee80211_state, int); 71static int hwmp_send_action(struct ieee80211_node *, 72 const uint8_t [IEEE80211_ADDR_LEN], 73 const uint8_t [IEEE80211_ADDR_LEN], 74 uint8_t *, size_t); 75static uint8_t * hwmp_add_meshpreq(uint8_t *, 76 const struct ieee80211_meshpreq_ie *); 77static uint8_t * hwmp_add_meshprep(uint8_t *, 78 const struct ieee80211_meshprep_ie *); 79static uint8_t * hwmp_add_meshperr(uint8_t *, 80 const struct ieee80211_meshperr_ie *); 81static uint8_t * hwmp_add_meshrann(uint8_t *, 82 const struct ieee80211_meshrann_ie *); 83static void hwmp_rootmode_setup(struct ieee80211vap *); 84static void hwmp_rootmode_cb(void *); 85static void hwmp_rootmode_rann_cb(void *); 86static void hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *, 87 const struct ieee80211_frame *, 88 const struct ieee80211_meshpreq_ie *); 89static int hwmp_send_preq(struct ieee80211_node *, 90 const uint8_t [IEEE80211_ADDR_LEN], 91 const uint8_t [IEEE80211_ADDR_LEN], 92 struct ieee80211_meshpreq_ie *); 93static void hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *, 94 const struct ieee80211_frame *, 95 const struct ieee80211_meshprep_ie *); 96static int hwmp_send_prep(struct ieee80211_node *, 97 const uint8_t [IEEE80211_ADDR_LEN], 98 const uint8_t [IEEE80211_ADDR_LEN], 99 struct ieee80211_meshprep_ie *); 100static void hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *, 101 const struct ieee80211_frame *, 102 const struct ieee80211_meshperr_ie *); 103static int hwmp_send_perr(struct ieee80211_node *, 104 const uint8_t [IEEE80211_ADDR_LEN], 105 const uint8_t [IEEE80211_ADDR_LEN], 106 struct ieee80211_meshperr_ie *); 107static void hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *, 108 const struct ieee80211_frame *, 109 const struct ieee80211_meshrann_ie *); 110static int hwmp_send_rann(struct ieee80211_node *, 111 const uint8_t [IEEE80211_ADDR_LEN], 112 const uint8_t [IEEE80211_ADDR_LEN], 113 struct ieee80211_meshrann_ie *); 114static struct ieee80211_node * 115 hwmp_discover(struct ieee80211vap *, 116 const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *); 117static void hwmp_peerdown(struct ieee80211_node *); 118 119static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 }; 120static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 }; 121 122/* unalligned little endian access */ 123#define LE_WRITE_2(p, v) do { \ 124 ((uint8_t *)(p))[0] = (v) & 0xff; \ 125 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 126} while (0) 127#define LE_WRITE_4(p, v) do { \ 128 ((uint8_t *)(p))[0] = (v) & 0xff; \ 129 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 130 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ 131 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ 132} while (0) 133 134 135/* NB: the Target Address set in a Proactive PREQ is the broadcast address. */ 136static const uint8_t broadcastaddr[IEEE80211_ADDR_LEN] = 137 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 138 139typedef uint32_t ieee80211_hwmp_seq; 140#define HWMP_SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0) 141#define HWMP_SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0) 142#define HWMP_SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0) 143#define HWMP_SEQ_GEQ(a, b) ((int32_t)((a)-(b)) >= 0) 144 145/* 146 * Private extension of ieee80211_mesh_route. 147 */ 148struct ieee80211_hwmp_route { 149 ieee80211_hwmp_seq hr_seq; /* last HWMP seq seen from dst*/ 150 ieee80211_hwmp_seq hr_preqid; /* last PREQ ID seen from dst */ 151 ieee80211_hwmp_seq hr_targetseq; /* seq. no. on our latest PREQ*/ 152 int hr_preqretries; 153}; 154struct ieee80211_hwmp_state { 155 ieee80211_hwmp_seq hs_seq; /* next seq to be used */ 156 ieee80211_hwmp_seq hs_preqid; /* next PREQ ID to be used */ 157 struct timeval hs_lastpreq; /* last time we sent a PREQ */ 158 struct timeval hs_lastperr; /* last time we sent a PERR */ 159 int hs_rootmode; /* proactive HWMP */ 160 struct callout hs_roottimer; 161 uint8_t hs_maxhops; /* max hop count */ 162}; 163 164SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0, 165 "IEEE 802.11s HWMP parameters"); 166static int ieee80211_hwmp_targetonly = 0; 167SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLTYPE_INT | CTLFLAG_RW, 168 &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs"); 169static int ieee80211_hwmp_replyforward = 1; 170SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, replyforward, CTLTYPE_INT | CTLFLAG_RW, 171 &ieee80211_hwmp_replyforward, 0, "Set RF bit on generated PREQs"); 172static int ieee80211_hwmp_pathtimeout = -1; 173SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, CTLTYPE_INT | CTLFLAG_RW, 174 &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I", 175 "path entry lifetime (ms)"); 176static int ieee80211_hwmp_roottimeout = -1; 177SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, CTLTYPE_INT | CTLFLAG_RW, 178 &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I", 179 "root PREQ timeout (ms)"); 180static int ieee80211_hwmp_rootint = -1; 181SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, CTLTYPE_INT | CTLFLAG_RW, 182 &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I", 183 "root interval (ms)"); 184static int ieee80211_hwmp_rannint = -1; 185SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, CTLTYPE_INT | CTLFLAG_RW, 186 &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I", 187 "root announcement interval (ms)"); 188 189#define IEEE80211_HWMP_DEFAULT_MAXHOPS 31 190 191static ieee80211_recv_action_func hwmp_recv_action_meshpath_preq; 192static ieee80211_recv_action_func hwmp_recv_action_meshpath_prep; 193static ieee80211_recv_action_func hwmp_recv_action_meshpath_perr; 194static ieee80211_recv_action_func hwmp_recv_action_meshpath_rann; 195 196static struct ieee80211_mesh_proto_path mesh_proto_hwmp = { 197 .mpp_descr = "HWMP", 198 .mpp_ie = IEEE80211_MESHCONF_HWMP, 199 .mpp_discover = hwmp_discover, 200 .mpp_peerdown = hwmp_peerdown, 201 .mpp_vattach = hwmp_vattach, 202 .mpp_vdetach = hwmp_vdetach, 203 .mpp_newstate = hwmp_newstate, 204 .mpp_privlen = sizeof(struct ieee80211_hwmp_route), 205}; 206SYSCTL_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 211static void 212ieee80211_hwmp_init(void) 213{ 214 ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000); 215 ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000); 216 ieee80211_hwmp_rootint = msecs_to_ticks(2*1000); 217 ieee80211_hwmp_rannint = msecs_to_ticks(1*1000); 218 219 /* 220 * Register action frame handlers. 221 */ 222 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPATH, 223 IEEE80211_ACTION_MESHPATH_REQ, hwmp_recv_action_meshpath_preq); 224 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPATH, 225 IEEE80211_ACTION_MESHPATH_REP, hwmp_recv_action_meshpath_prep); 226 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPATH, 227 IEEE80211_ACTION_MESHPATH_ERR, hwmp_recv_action_meshpath_perr); 228 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPATH, 229 IEEE80211_ACTION_MESHPATH_RANN, hwmp_recv_action_meshpath_rann); 230 231 /* NB: default is 5 secs per spec */ 232 mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000); 233 234 /* 235 * Register HWMP. 236 */ 237 ieee80211_mesh_register_proto_path(&mesh_proto_hwmp); 238} 239SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL); 240 241void 242hwmp_vattach(struct ieee80211vap *vap) 243{ 244 struct ieee80211_hwmp_state *hs; 245 246 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 247 ("not a mesh vap, opmode %d", vap->iv_opmode)); 248 249 hs = malloc(sizeof(struct ieee80211_hwmp_state), M_80211_VAP, 250 M_NOWAIT | M_ZERO); 251 if (hs == NULL) { 252 printf("%s: couldn't alloc HWMP state\n", __func__); 253 return; 254 } 255 hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS; 256 callout_init(&hs->hs_roottimer, CALLOUT_MPSAFE); 257 vap->iv_hwmp = hs; 258} 259 260void 261hwmp_vdetach(struct ieee80211vap *vap) 262{ 263 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 264 265 callout_drain(&hs->hs_roottimer); 266 free(vap->iv_hwmp, M_80211_VAP); 267 vap->iv_hwmp = NULL; 268} 269 270int 271hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg) 272{ 273 enum ieee80211_state nstate = vap->iv_state; 274 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 275 276 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 277 __func__, ieee80211_state_name[ostate], 278 ieee80211_state_name[nstate], arg); 279 280 if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN) 281 callout_drain(&hs->hs_roottimer); 282 if (nstate == IEEE80211_S_RUN) 283 hwmp_rootmode_setup(vap); 284 return 0; 285} 286 287static int 288hwmp_recv_action_meshpath_preq(struct ieee80211_node *ni, 289 const struct ieee80211_frame *wh, 290 const uint8_t *frm, const uint8_t *efrm) 291{ 292 struct ieee80211vap *vap = ni->ni_vap; 293 struct ieee80211_meshpreq_ie preq; 294 const uint8_t *iefrm = frm + 2; /* action + code */ 295 296 while (efrm - iefrm > 1) { 297 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0); 298 if (*iefrm == IEEE80211_ELEMID_MESHPREQ) { 299 const struct ieee80211_meshpreq_ie *mpreq = 300 (const struct ieee80211_meshpreq_ie *) iefrm; 301 /* XXX > 1 target */ 302 if (mpreq->preq_len != 303 sizeof(struct ieee80211_meshpreq_ie) - 2) { 304 IEEE80211_DISCARD(vap, 305 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 306 wh, NULL, "%s", "PREQ with wrong len"); 307 vap->iv_stats.is_rx_mgtdiscard++; 308 return 1; 309 } 310 memcpy(&preq, mpreq, sizeof(preq)); 311 preq.preq_id = LE_READ_4(&mpreq->preq_id); 312 preq.preq_origseq = LE_READ_4(&mpreq->preq_origseq); 313 preq.preq_lifetime = LE_READ_4(&mpreq->preq_lifetime); 314 preq.preq_metric = LE_READ_4(&mpreq->preq_metric); 315 preq.preq_targets[0].target_seq = 316 LE_READ_4(&mpreq->preq_targets[0].target_seq); 317 hwmp_recv_preq(vap, ni, wh, &preq); 318 return 0; 319 } 320 iefrm += iefrm[1] + 2; 321 } 322 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 323 wh, NULL, "%s", "PREQ without IE"); 324 vap->iv_stats.is_rx_mgtdiscard++; 325 return 0; 326} 327 328static int 329hwmp_recv_action_meshpath_prep(struct ieee80211_node *ni, 330 const struct ieee80211_frame *wh, 331 const uint8_t *frm, const uint8_t *efrm) 332{ 333 struct ieee80211vap *vap = ni->ni_vap; 334 struct ieee80211_meshprep_ie prep; 335 const uint8_t *iefrm = frm + 2; /* action + code */ 336 337 while (efrm - iefrm > 1) { 338 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0); 339 if (*iefrm == IEEE80211_ELEMID_MESHPREP) { 340 const struct ieee80211_meshprep_ie *mprep = 341 (const struct ieee80211_meshprep_ie *) iefrm; 342 if (mprep->prep_len != 343 sizeof(struct ieee80211_meshprep_ie) - 2) { 344 IEEE80211_DISCARD(vap, 345 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 346 wh, NULL, "%s", "PREP with wrong len"); 347 vap->iv_stats.is_rx_mgtdiscard++; 348 return 1; 349 } 350 memcpy(&prep, mprep, sizeof(prep)); 351 prep.prep_targetseq = LE_READ_4(&mprep->prep_targetseq); 352 prep.prep_lifetime = LE_READ_4(&mprep->prep_lifetime); 353 prep.prep_metric = LE_READ_4(&mprep->prep_metric); 354 prep.prep_origseq = LE_READ_4(&mprep->prep_origseq); 355 hwmp_recv_prep(vap, ni, wh, &prep); 356 return 0; 357 } 358 iefrm += iefrm[1] + 2; 359 } 360 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 361 wh, NULL, "%s", "PREP without IE"); 362 vap->iv_stats.is_rx_mgtdiscard++; 363 return 0; 364} 365 366static int 367hwmp_recv_action_meshpath_perr(struct ieee80211_node *ni, 368 const struct ieee80211_frame *wh, 369 const uint8_t *frm, const uint8_t *efrm) 370{ 371 struct ieee80211_meshperr_ie perr; 372 struct ieee80211vap *vap = ni->ni_vap; 373 const uint8_t *iefrm = frm + 2; /* action + code */ 374 375 while (efrm - iefrm > 1) { 376 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0); 377 if (*iefrm == IEEE80211_ELEMID_MESHPERR) { 378 const struct ieee80211_meshperr_ie *mperr = 379 (const struct ieee80211_meshperr_ie *) iefrm; 380 /* XXX > 1 target */ 381 if (mperr->perr_len != 382 sizeof(struct ieee80211_meshperr_ie) - 2) { 383 IEEE80211_DISCARD(vap, 384 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 385 wh, NULL, "%s", "PERR with wrong len"); 386 vap->iv_stats.is_rx_mgtdiscard++; 387 return 1; 388 } 389 memcpy(&perr, mperr, sizeof(perr)); 390 perr.perr_dests[0].dest_seq = 391 LE_READ_4(&mperr->perr_dests[0].dest_seq); 392 hwmp_recv_perr(vap, ni, wh, &perr); 393 return 0; 394 } 395 iefrm += iefrm[1] + 2; 396 } 397 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 398 wh, NULL, "%s", "PERR without IE"); 399 vap->iv_stats.is_rx_mgtdiscard++; 400 return 0; 401} 402 403static int 404hwmp_recv_action_meshpath_rann(struct ieee80211_node *ni, 405 const struct ieee80211_frame *wh, 406 const uint8_t *frm, const uint8_t *efrm) 407{ 408 struct ieee80211vap *vap = ni->ni_vap; 409 struct ieee80211_meshrann_ie rann; 410 const uint8_t *iefrm = frm + 2; /* action + code */ 411 412 while (efrm - iefrm > 1) { 413 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0); 414 if (*iefrm == IEEE80211_ELEMID_MESHRANN) { 415 const struct ieee80211_meshrann_ie *mrann = 416 (const struct ieee80211_meshrann_ie *) iefrm; 417 if (mrann->rann_len != 418 sizeof(struct ieee80211_meshrann_ie) - 2) { 419 IEEE80211_DISCARD(vap, 420 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 421 wh, NULL, "%s", "RAN with wrong len"); 422 vap->iv_stats.is_rx_mgtdiscard++; 423 return 1; 424 } 425 memcpy(&rann, mrann, sizeof(rann)); 426 rann.rann_seq = LE_READ_4(&mrann->rann_seq); 427 rann.rann_metric = LE_READ_4(&mrann->rann_metric); 428 hwmp_recv_rann(vap, ni, wh, &rann); 429 return 0; 430 } 431 iefrm += iefrm[1] + 2; 432 } 433 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, 434 wh, NULL, "%s", "RANN without IE"); 435 vap->iv_stats.is_rx_mgtdiscard++; 436 return 0; 437} 438 439static int 440hwmp_send_action(struct ieee80211_node *ni, 441 const uint8_t sa[IEEE80211_ADDR_LEN], 442 const uint8_t da[IEEE80211_ADDR_LEN], 443 uint8_t *ie, size_t len) 444{ 445 struct ieee80211vap *vap = ni->ni_vap; 446 struct ieee80211com *ic = ni->ni_ic; 447 struct ieee80211_bpf_params params; 448 struct mbuf *m; 449 uint8_t *frm; 450 451 if (vap->iv_state == IEEE80211_S_CAC) { 452 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 453 "block %s frame in CAC state", "HWMP action"); 454 vap->iv_stats.is_tx_badstate++; 455 return EIO; /* XXX */ 456 } 457 458 KASSERT(ni != NULL, ("null node")); 459 /* 460 * Hold a reference on the node so it doesn't go away until after 461 * the xmit is complete all the way in the driver. On error we 462 * will remove our reference. 463 */ 464#ifdef IEEE80211_DEBUG_REFCNT 465 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 466 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 467 __func__, __LINE__, 468 ni, ether_sprintf(ni->ni_macaddr), 469 ieee80211_node_refcnt(ni)+1); 470#endif 471 ieee80211_ref_node(ni); 472 473 m = ieee80211_getmgtframe(&frm, 474 ic->ic_headroom + sizeof(struct ieee80211_frame), 475 sizeof(struct ieee80211_action) + len 476 ); 477 if (m == NULL) { 478 ieee80211_free_node(ni); 479 vap->iv_stats.is_tx_nobuf++; 480 return ENOMEM; 481 } 482 *frm++ = IEEE80211_ACTION_CAT_MESHPATH; 483 switch (*ie) { 484 case IEEE80211_ELEMID_MESHPREQ: 485 *frm++ = IEEE80211_ACTION_MESHPATH_REQ; 486 frm = hwmp_add_meshpreq(frm, 487 (struct ieee80211_meshpreq_ie *)ie); 488 break; 489 case IEEE80211_ELEMID_MESHPREP: 490 *frm++ = IEEE80211_ACTION_MESHPATH_REP; 491 frm = hwmp_add_meshprep(frm, 492 (struct ieee80211_meshprep_ie *)ie); 493 break; 494 case IEEE80211_ELEMID_MESHPERR: 495 *frm++ = IEEE80211_ACTION_MESHPATH_ERR; 496 frm = hwmp_add_meshperr(frm, 497 (struct ieee80211_meshperr_ie *)ie); 498 break; 499 case IEEE80211_ELEMID_MESHRANN: 500 *frm++ = IEEE80211_ACTION_MESHPATH_RANN; 501 frm = hwmp_add_meshrann(frm, 502 (struct ieee80211_meshrann_ie *)ie); 503 break; 504 } 505 506 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 507 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 508 if (m == NULL) { 509 ieee80211_free_node(ni); 510 vap->iv_stats.is_tx_nobuf++; 511 return ENOMEM; 512 } 513 ieee80211_send_setup(ni, m, 514 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION, 515 IEEE80211_NONQOS_TID, sa, da, sa); 516 517 m->m_flags |= M_ENCAP; /* mark encapsulated */ 518 IEEE80211_NODE_STAT(ni, tx_mgmt); 519 520 memset(¶ms, 0, sizeof(params)); 521 params.ibp_pri = WME_AC_VO; 522 params.ibp_rate0 = ni->ni_txparms->mgmtrate; 523 if (IEEE80211_IS_MULTICAST(da)) 524 params.ibp_try0 = 1; 525 else 526 params.ibp_try0 = ni->ni_txparms->maxretry; 527 params.ibp_power = ni->ni_txpower; 528 return ic->ic_raw_xmit(ni, m, ¶ms); 529} 530 531#define ADDWORD(frm, v) do { \ 532 LE_WRITE_4(frm, v); \ 533 frm += 4; \ 534} while (0) 535/* 536 * Add a Mesh Path Request IE to a frame. 537 */ 538static uint8_t * 539hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq) 540{ 541 int i; 542 543 *frm++ = IEEE80211_ELEMID_MESHPREQ; 544 *frm++ = sizeof(struct ieee80211_meshpreq_ie) - 2 + 545 (preq->preq_tcount - 1) * sizeof(*preq->preq_targets); 546 *frm++ = preq->preq_flags; 547 *frm++ = preq->preq_hopcount; 548 *frm++ = preq->preq_ttl; 549 ADDWORD(frm, preq->preq_id); 550 IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6; 551 ADDWORD(frm, preq->preq_origseq); 552 ADDWORD(frm, preq->preq_lifetime); 553 ADDWORD(frm, preq->preq_metric); 554 *frm++ = preq->preq_tcount; 555 for (i = 0; i < preq->preq_tcount; i++) { 556 *frm++ = preq->preq_targets[i].target_flags; 557 IEEE80211_ADDR_COPY(frm, preq->preq_targets[i].target_addr); 558 frm += 6; 559 ADDWORD(frm, preq->preq_targets[i].target_seq); 560 } 561 return frm; 562} 563 564/* 565 * Add a Mesh Path Reply IE to a frame. 566 */ 567static uint8_t * 568hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep) 569{ 570 *frm++ = IEEE80211_ELEMID_MESHPREP; 571 *frm++ = sizeof(struct ieee80211_meshprep_ie) - 2; 572 *frm++ = prep->prep_flags; 573 *frm++ = prep->prep_hopcount; 574 *frm++ = prep->prep_ttl; 575 IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6; 576 ADDWORD(frm, prep->prep_targetseq); 577 ADDWORD(frm, prep->prep_lifetime); 578 ADDWORD(frm, prep->prep_metric); 579 IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6; 580 ADDWORD(frm, prep->prep_origseq); 581 return frm; 582} 583 584/* 585 * Add a Mesh Path Error IE to a frame. 586 */ 587static uint8_t * 588hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr) 589{ 590 int i; 591 592 *frm++ = IEEE80211_ELEMID_MESHPERR; 593 *frm++ = sizeof(struct ieee80211_meshperr_ie) - 2 + 594 (perr->perr_ndests - 1) * sizeof(*perr->perr_dests); 595 *frm++ = perr->perr_mode; 596 *frm++ = perr->perr_ndests; 597 for (i = 0; i < perr->perr_ndests; i++) { 598 IEEE80211_ADDR_COPY(frm, perr->perr_dests[i].dest_addr); 599 frm += 6; 600 ADDWORD(frm, perr->perr_dests[i].dest_seq); 601 } 602 return frm; 603} 604 605/* 606 * Add a Root Annoucement IE to a frame. 607 */ 608static uint8_t * 609hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann) 610{ 611 *frm++ = IEEE80211_ELEMID_MESHRANN; 612 *frm++ = sizeof(struct ieee80211_meshrann_ie) - 2; 613 *frm++ = rann->rann_flags; 614 *frm++ = rann->rann_hopcount; 615 *frm++ = rann->rann_ttl; 616 IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6; 617 ADDWORD(frm, rann->rann_seq); 618 ADDWORD(frm, rann->rann_metric); 619 return frm; 620} 621 622static void 623hwmp_rootmode_setup(struct ieee80211vap *vap) 624{ 625 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 626 627 switch (hs->hs_rootmode) { 628 case IEEE80211_HWMP_ROOTMODE_DISABLED: 629 callout_drain(&hs->hs_roottimer); 630 break; 631 case IEEE80211_HWMP_ROOTMODE_NORMAL: 632 case IEEE80211_HWMP_ROOTMODE_PROACTIVE: 633 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint, 634 hwmp_rootmode_cb, vap); 635 break; 636 case IEEE80211_HWMP_ROOTMODE_RANN: 637 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint, 638 hwmp_rootmode_rann_cb, vap); 639 break; 640 } 641} 642 643/* 644 * Send a broadcast Path Request to find all nodes on the mesh. We are 645 * called when the vap is configured as a HWMP root node. 646 */ 647#define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 648#define PREQ_TADDR(n) preq.preq_targets[n].target_addr 649#define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 650static void 651hwmp_rootmode_cb(void *arg) 652{ 653 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 654 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 655 struct ieee80211_mesh_state *ms = vap->iv_mesh; 656 struct ieee80211_meshpreq_ie preq; 657 658 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 659 "%s", "send broadcast PREQ"); 660 661 preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM; 662 if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL) 663 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PR; 664 if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE) 665 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP; 666 preq.preq_hopcount = 0; 667 preq.preq_ttl = ms->ms_ttl; 668 preq.preq_id = ++hs->hs_preqid; 669 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 670 preq.preq_origseq = ++hs->hs_seq; 671 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout); 672 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 673 preq.preq_tcount = 1; 674 IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr); 675 PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO | 676 IEEE80211_MESHPREQ_TFLAGS_RF; 677 PREQ_TSEQ(0) = 0; 678 vap->iv_stats.is_hwmp_rootreqs++; 679 hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &preq); 680 hwmp_rootmode_setup(vap); 681} 682#undef PREQ_TFLAGS 683#undef PREQ_TADDR 684#undef PREQ_TSEQ 685 686/* 687 * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are 688 * called when the vap is configured as a HWMP RANN root node. 689 */ 690static void 691hwmp_rootmode_rann_cb(void *arg) 692{ 693 struct ieee80211vap *vap = (struct ieee80211vap *)arg; 694 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 695 struct ieee80211_mesh_state *ms = vap->iv_mesh; 696 struct ieee80211_meshrann_ie rann; 697 698 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss, 699 "%s", "send broadcast RANN"); 700 701 if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL) 702 rann.rann_flags |= IEEE80211_MESHRANN_FLAGS_PR; 703 rann.rann_hopcount = 0; 704 rann.rann_ttl = ms->ms_ttl; 705 IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr); 706 rann.rann_seq = ++hs->hs_seq; 707 rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 708 709 vap->iv_stats.is_hwmp_rootrann++; 710 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &rann); 711 hwmp_rootmode_setup(vap); 712} 713 714#define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags 715#define PREQ_TADDR(n) preq->preq_targets[n].target_addr 716#define PREQ_TSEQ(n) preq->preq_targets[n].target_seq 717static void 718hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni, 719 const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq) 720{ 721 struct ieee80211_mesh_state *ms = vap->iv_mesh; 722 struct ieee80211_mesh_route *rt = NULL; 723 struct ieee80211_mesh_route *rtorig = NULL; 724 struct ieee80211_hwmp_route *hrorig; 725 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 726 struct ieee80211_meshprep_ie prep; 727 728 if (ni == vap->iv_bss || 729 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED) 730 return; 731 /* 732 * Ignore PREQs from us. Could happen because someone forward it 733 * back to us. 734 */ 735 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr)) 736 return; 737 738 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 739 "received PREQ, source %s", ether_sprintf(preq->preq_origaddr)); 740 741 /* 742 * Acceptance criteria: if the PREQ is not for us and 743 * forwarding is disabled, discard this PREQ. 744 */ 745 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) && 746 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) { 747 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 748 preq->preq_origaddr, NULL, "%s", "not accepting PREQ"); 749 return; 750 } 751 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr); 752 if (rtorig == NULL) 753 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr); 754 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route); 755 /* 756 * Sequence number validation. 757 */ 758 if (HWMP_SEQ_LEQ(preq->preq_id, hrorig->hr_preqid) && 759 HWMP_SEQ_LEQ(preq->preq_origseq, hrorig->hr_seq)) { 760 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 761 "discard PREQ from %s, old seq no %u <= %u", 762 ether_sprintf(preq->preq_origaddr), 763 preq->preq_origseq, hrorig->hr_seq); 764 return; 765 } 766 hrorig->hr_preqid = preq->preq_id; 767 hrorig->hr_seq = preq->preq_origseq; 768 769 /* 770 * Check if the PREQ is addressed to us. 771 */ 772 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) { 773 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 774 "reply to %s", ether_sprintf(preq->preq_origaddr)); 775 /* 776 * Build and send a PREP frame. 777 */ 778 prep.prep_flags = 0; 779 prep.prep_hopcount = 0; 780 prep.prep_ttl = ms->ms_ttl; 781 IEEE80211_ADDR_COPY(prep.prep_targetaddr, preq->preq_origaddr); 782 prep.prep_targetseq = preq->preq_origseq; 783 prep.prep_lifetime = preq->preq_lifetime; 784 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 785 IEEE80211_ADDR_COPY(prep.prep_origaddr, vap->iv_myaddr); 786 prep.prep_origseq = ++hs->hs_seq; 787 hwmp_send_prep(ni, vap->iv_myaddr, wh->i_addr2, &prep); 788 /* 789 * Build the reverse path, if we don't have it already. 790 */ 791 rt = ieee80211_mesh_rt_find(vap, preq->preq_origaddr); 792 if (rt == NULL) 793 hwmp_discover(vap, preq->preq_origaddr, NULL); 794 else if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) 795 hwmp_discover(vap, rt->rt_dest, NULL); 796 return; 797 } 798 /* 799 * Proactive PREQ: reply with a proactive PREP to the 800 * root STA if requested. 801 */ 802 if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) && 803 (PREQ_TFLAGS(0) & 804 ((IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF) == 805 (IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF)))) { 806 uint8_t rootmac[IEEE80211_ADDR_LEN]; 807 808 IEEE80211_ADDR_COPY(rootmac, preq->preq_origaddr); 809 rt = ieee80211_mesh_rt_find(vap, rootmac); 810 if (rt == NULL) { 811 rt = ieee80211_mesh_rt_add(vap, rootmac); 812 if (rt == NULL) { 813 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 814 "unable to add root mesh path to %s", 815 ether_sprintf(rootmac)); 816 vap->iv_stats.is_mesh_rtaddfailed++; 817 return; 818 } 819 } 820 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 821 "root mesh station @ %s", ether_sprintf(rootmac)); 822 823 /* 824 * Reply with a PREP if we don't have a path to the root 825 * or if the root sent us a proactive PREQ. 826 */ 827 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 || 828 (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) { 829 prep.prep_flags = 0; 830 prep.prep_hopcount = 0; 831 prep.prep_ttl = ms->ms_ttl; 832 IEEE80211_ADDR_COPY(prep.prep_origaddr, vap->iv_myaddr); 833 prep.prep_origseq = preq->preq_origseq; 834 prep.prep_targetseq = ++hs->hs_seq; 835 prep.prep_lifetime = preq->preq_lifetime; 836 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 837 IEEE80211_ADDR_COPY(prep.prep_targetaddr, rootmac); 838 prep.prep_targetseq = PREQ_TSEQ(0); 839 hwmp_send_prep(vap->iv_bss, vap->iv_myaddr, 840 broadcastaddr, &prep); 841 } 842 hwmp_discover(vap, rootmac, NULL); 843 return; 844 } 845 rt = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0)); 846 847 /* 848 * Forwarding and Intermediate reply for PREQs with 1 target. 849 */ 850 if (preq->preq_tcount == 1) { 851 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */ 852 853 memcpy(&ppreq, preq, sizeof(ppreq)); 854 /* 855 * We have a valid route to this node. 856 */ 857 if (rt != NULL && 858 (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) { 859 if (preq->preq_ttl > 1 && 860 preq->preq_hopcount < hs->hs_maxhops) { 861 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 862 "forward PREQ from %s", 863 ether_sprintf(preq->preq_origaddr)); 864 /* 865 * Propagate the original PREQ. 866 */ 867 ppreq.preq_hopcount += 1; 868 ppreq.preq_ttl -= 1; 869 ppreq.preq_metric += 870 ms->ms_pmetric->mpm_metric(ni); 871 /* 872 * Set TO and unset RF bits because we are going 873 * to send a PREP next. 874 */ 875 ppreq.preq_targets[0].target_flags |= 876 IEEE80211_MESHPREQ_TFLAGS_TO; 877 ppreq.preq_targets[0].target_flags &= 878 ~IEEE80211_MESHPREQ_TFLAGS_RF; 879 hwmp_send_preq(ni, vap->iv_myaddr, 880 broadcastaddr, &ppreq); 881 } 882 /* 883 * Check if we can send an intermediate Path Reply, 884 * i.e., Target Only bit is not set. 885 */ 886 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) { 887 struct ieee80211_meshprep_ie prep; 888 889 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 890 "intermediate reply for PREQ from %s", 891 ether_sprintf(preq->preq_origaddr)); 892 prep.prep_flags = 0; 893 prep.prep_hopcount = rt->rt_nhops + 1; 894 prep.prep_ttl = ms->ms_ttl; 895 IEEE80211_ADDR_COPY(&prep.prep_targetaddr, 896 preq->preq_origaddr); 897 prep.prep_targetseq = hrorig->hr_seq; 898 prep.prep_lifetime = preq->preq_lifetime; 899 prep.prep_metric = rt->rt_metric + 900 ms->ms_pmetric->mpm_metric(ni); 901 IEEE80211_ADDR_COPY(&prep.prep_origaddr, 902 PREQ_TADDR(0)); 903 prep.prep_origseq = hrorig->hr_seq; 904 hwmp_send_prep(ni, vap->iv_myaddr, 905 broadcastaddr, &prep); 906 } 907 /* 908 * We have no information about this path, 909 * propagate the PREQ. 910 */ 911 } else if (preq->preq_ttl > 1 && 912 preq->preq_hopcount < hs->hs_maxhops) { 913 if (rt == NULL) { 914 rt = ieee80211_mesh_rt_add(vap, PREQ_TADDR(0)); 915 if (rt == NULL) { 916 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 917 ni, "unable to add PREQ path to %s", 918 ether_sprintf(PREQ_TADDR(0))); 919 vap->iv_stats.is_mesh_rtaddfailed++; 920 return; 921 } 922 } 923 rt->rt_metric = preq->preq_metric; 924 rt->rt_lifetime = preq->preq_lifetime; 925 hrorig = IEEE80211_MESH_ROUTE_PRIV(rt, 926 struct ieee80211_hwmp_route); 927 hrorig->hr_seq = preq->preq_origseq; 928 hrorig->hr_preqid = preq->preq_id; 929 930 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 931 "forward PREQ from %s", 932 ether_sprintf(preq->preq_origaddr)); 933 ppreq.preq_hopcount += 1; 934 ppreq.preq_ttl -= 1; 935 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni); 936 hwmp_send_preq(ni, vap->iv_myaddr, broadcastaddr, 937 &ppreq); 938 } 939 } 940 941} 942#undef PREQ_TFLAGS 943#undef PREQ_TADDR 944#undef PREQ_TSEQ 945 946static int 947hwmp_send_preq(struct ieee80211_node *ni, 948 const uint8_t sa[IEEE80211_ADDR_LEN], 949 const uint8_t da[IEEE80211_ADDR_LEN], 950 struct ieee80211_meshpreq_ie *preq) 951{ 952 struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp; 953 954 /* 955 * Enforce PREQ interval. 956 */ 957 if (ratecheck(&hs->hs_lastpreq, &ieee80211_hwmp_preqminint) == 0) 958 return EALREADY; 959 getmicrouptime(&hs->hs_lastpreq); 960 961 /* 962 * mesh preq action frame format 963 * [6] da 964 * [6] sa 965 * [6] addr3 = sa 966 * [1] action 967 * [1] category 968 * [tlv] mesh path request 969 */ 970 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ; 971 return hwmp_send_action(ni, sa, da, (uint8_t *)preq, 972 sizeof(struct ieee80211_meshpreq_ie)); 973} 974 975static void 976hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni, 977 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep) 978{ 979 struct ieee80211_mesh_state *ms = vap->iv_mesh; 980 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 981 struct ieee80211_mesh_route *rt = NULL; 982 struct ieee80211_hwmp_route *hr; 983 struct ieee80211com *ic = vap->iv_ic; 984 struct ifnet *ifp = vap->iv_ifp; 985 struct mbuf *m, *next; 986 987 /* 988 * Acceptance criteria: if the corresponding PREQ was not generated 989 * by us and forwarding is disabled, discard this PREP. 990 */ 991 if (ni == vap->iv_bss || 992 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED) 993 return; 994 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) && 995 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) 996 return; 997 998 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 999 "received PREP from %s", ether_sprintf(prep->prep_origaddr)); 1000 1001 rt = ieee80211_mesh_rt_find(vap, prep->prep_origaddr); 1002 if (rt == NULL) { 1003 /* 1004 * If we have no entry this could be a reply to a root PREQ. 1005 */ 1006 if (hs->hs_rootmode != IEEE80211_HWMP_ROOTMODE_DISABLED) { 1007 rt = ieee80211_mesh_rt_add(vap, prep->prep_origaddr); 1008 if (rt == NULL) { 1009 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 1010 ni, "unable to add PREP path to %s", 1011 ether_sprintf(prep->prep_origaddr)); 1012 vap->iv_stats.is_mesh_rtaddfailed++; 1013 return; 1014 } 1015 IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2); 1016 rt->rt_nhops = prep->prep_hopcount; 1017 rt->rt_lifetime = prep->prep_lifetime; 1018 rt->rt_metric = prep->prep_metric; 1019 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; 1020 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1021 "add root path to %s nhops %d metric %d (PREP)", 1022 ether_sprintf(prep->prep_origaddr), 1023 rt->rt_nhops, rt->rt_metric); 1024 return; 1025 } 1026 return; 1027 } 1028 /* 1029 * Sequence number validation. 1030 */ 1031 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1032 if (HWMP_SEQ_LEQ(prep->prep_origseq, hr->hr_seq)) { 1033 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1034 "discard PREP from %s, old seq no %u <= %u", 1035 ether_sprintf(prep->prep_origaddr), 1036 prep->prep_origseq, hr->hr_seq); 1037 return; 1038 } 1039 hr->hr_seq = prep->prep_origseq; 1040 /* 1041 * If it's NOT for us, propagate the PREP. 1042 */ 1043 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_targetaddr) && 1044 prep->prep_ttl > 1 && prep->prep_hopcount < hs->hs_maxhops) { 1045 struct ieee80211_meshprep_ie pprep; /* propagated PREP */ 1046 1047 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1048 "propagate PREP from %s", 1049 ether_sprintf(prep->prep_origaddr)); 1050 1051 memcpy(&pprep, prep, sizeof(pprep)); 1052 pprep.prep_hopcount += 1; 1053 pprep.prep_ttl -= 1; 1054 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni); 1055 IEEE80211_ADDR_COPY(pprep.prep_origaddr, vap->iv_myaddr); 1056 hwmp_send_prep(ni, vap->iv_myaddr, broadcastaddr, &pprep); 1057 } 1058 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1059 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1060 /* NB: never clobber a proxy entry */; 1061 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1062 "discard PREP for %s, route is marked PROXY", 1063 ether_sprintf(prep->prep_origaddr)); 1064 vap->iv_stats.is_hwmp_proxy++; 1065 } else if (prep->prep_targetseq == hr->hr_targetseq) { 1066 /* 1067 * Check if we already have a path to this node. 1068 * If we do, check if this path reply contains a 1069 * better route. 1070 */ 1071 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 || 1072 (prep->prep_hopcount < rt->rt_nhops || 1073 prep->prep_metric < rt->rt_metric)) { 1074 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1075 "%s path to %s, hopcount %d:%d metric %d:%d", 1076 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ? 1077 "prefer" : "update", 1078 ether_sprintf(prep->prep_origaddr), 1079 rt->rt_nhops, prep->prep_hopcount, 1080 rt->rt_metric, prep->prep_metric); 1081 IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2); 1082 rt->rt_nhops = prep->prep_hopcount; 1083 rt->rt_lifetime = prep->prep_lifetime; 1084 rt->rt_metric = prep->prep_metric; 1085 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; 1086 } else { 1087 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1088 "ignore PREP for %s, hopcount %d:%d metric %d:%d", 1089 ether_sprintf(prep->prep_origaddr), 1090 rt->rt_nhops, prep->prep_hopcount, 1091 rt->rt_metric, prep->prep_metric); 1092 } 1093 } else { 1094 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1095 "discard PREP for %s, wrong seqno %u != %u", 1096 ether_sprintf(prep->prep_origaddr), prep->prep_targetseq, 1097 hr->hr_seq); 1098 vap->iv_stats.is_hwmp_wrongseq++; 1099 } 1100 /* 1101 * Check for frames queued awaiting path discovery. 1102 * XXX probably can tell exactly and avoid remove call 1103 * NB: hash may have false matches, if so they will get 1104 * stuck back on the stageq because there won't be 1105 * a path. 1106 */ 1107 m = ieee80211_ageq_remove(&ic->ic_stageq, 1108 (struct ieee80211_node *)(uintptr_t) 1109 ieee80211_mac_hash(ic, rt->rt_dest)); 1110 for (; m != NULL; m = next) { 1111 next = m->m_nextpkt; 1112 m->m_nextpkt = NULL; 1113 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1114 "flush queued frame %p len %d", m, m->m_pkthdr.len); 1115 ifp->if_transmit(ifp, m); 1116 } 1117} 1118 1119static int 1120hwmp_send_prep(struct ieee80211_node *ni, 1121 const uint8_t sa[IEEE80211_ADDR_LEN], 1122 const uint8_t da[IEEE80211_ADDR_LEN], 1123 struct ieee80211_meshprep_ie *prep) 1124{ 1125 /* NB: there's no PREP minimum interval. */ 1126 1127 /* 1128 * mesh prep action frame format 1129 * [6] da 1130 * [6] sa 1131 * [6] addr3 = sa 1132 * [1] action 1133 * [1] category 1134 * [tlv] mesh path reply 1135 */ 1136 prep->prep_ie = IEEE80211_ELEMID_MESHPREP; 1137 return hwmp_send_action(ni, sa, da, (uint8_t *)prep, 1138 sizeof(struct ieee80211_meshprep_ie)); 1139} 1140 1141#define PERR_DADDR(n) perr.perr_dests[n].dest_addr 1142#define PERR_DSEQ(n) perr.perr_dests[n].dest_seq 1143static void 1144hwmp_peerdown(struct ieee80211_node *ni) 1145{ 1146 struct ieee80211vap *vap = ni->ni_vap; 1147 struct ieee80211_meshperr_ie perr; 1148 struct ieee80211_mesh_route *rt; 1149 struct ieee80211_hwmp_route *hr; 1150 1151 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr); 1152 if (rt == NULL) 1153 return; 1154 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1155 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1156 "%s", "delete route entry"); 1157 perr.perr_mode = 0; 1158 perr.perr_ndests = 1; 1159 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest); 1160 PERR_DSEQ(0) = hr->hr_seq; 1161 /* NB: flush everything passing through peer */ 1162 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr); 1163 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &perr); 1164} 1165#undef PERR_DADDR 1166#undef PERR_DSEQ 1167 1168#define PERR_DADDR(n) perr->perr_dests[n].dest_addr 1169#define PERR_DSEQ(n) perr->perr_dests[n].dest_seq 1170static void 1171hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni, 1172 const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr) 1173{ 1174 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1175 struct ieee80211_mesh_route *rt = NULL; 1176 struct ieee80211_hwmp_route *hr; 1177 struct ieee80211_meshperr_ie pperr; 1178 int i, forward = 0; 1179 1180 /* 1181 * Acceptance criteria: check if we received a PERR from a 1182 * neighbor and forwarding is enabled. 1183 */ 1184 if (ni == vap->iv_bss || 1185 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED || 1186 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) 1187 return; 1188 /* 1189 * Find all routing entries that match and delete them. 1190 */ 1191 for (i = 0; i < perr->perr_ndests; i++) { 1192 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i)); 1193 if (rt == NULL) 1194 continue; 1195 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1196 struct ieee80211_hwmp_route); 1197 if (HWMP_SEQ_GEQ(PERR_DSEQ(i), hr->hr_seq)) { 1198 ieee80211_mesh_rt_del(vap, rt->rt_dest); 1199 ieee80211_mesh_rt_flush_peer(vap, rt->rt_dest); 1200 rt = NULL; 1201 forward = 1; 1202 } 1203 } 1204 /* 1205 * Propagate the PERR if we previously found it on our routing table. 1206 * XXX handle ndest > 1 1207 */ 1208 if (forward) { 1209 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni, 1210 "propagate PERR from %s", ether_sprintf(wh->i_addr2)); 1211 memcpy(&pperr, perr, sizeof(*perr)); 1212 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, 1213 &pperr); 1214 } 1215} 1216#undef PEER_DADDR 1217#undef PERR_DSEQ 1218 1219static int 1220hwmp_send_perr(struct ieee80211_node *ni, 1221 const uint8_t sa[IEEE80211_ADDR_LEN], 1222 const uint8_t da[IEEE80211_ADDR_LEN], 1223 struct ieee80211_meshperr_ie *perr) 1224{ 1225 struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp; 1226 1227 /* 1228 * Enforce PERR interval. 1229 */ 1230 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0) 1231 return EALREADY; 1232 getmicrouptime(&hs->hs_lastperr); 1233 1234 /* 1235 * mesh perr action frame format 1236 * [6] da 1237 * [6] sa 1238 * [6] addr3 = sa 1239 * [1] action 1240 * [1] category 1241 * [tlv] mesh path error 1242 */ 1243 perr->perr_ie = IEEE80211_ELEMID_MESHPERR; 1244 return hwmp_send_action(ni, sa, da, (uint8_t *)perr, 1245 sizeof(struct ieee80211_meshperr_ie)); 1246} 1247 1248static void 1249hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni, 1250 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann) 1251{ 1252 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1253 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1254 struct ieee80211_mesh_route *rt = NULL; 1255 struct ieee80211_hwmp_route *hr; 1256 struct ieee80211_meshrann_ie prann; 1257 1258 if (ni == vap->iv_bss || 1259 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED) 1260 return; 1261 1262 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr); 1263 /* 1264 * Discover the path to the root mesh STA. 1265 * If we already know it, propagate the RANN element. 1266 */ 1267 if (rt == NULL) { 1268 hwmp_discover(vap, rann->rann_addr, NULL); 1269 return; 1270 } 1271 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route); 1272 if (HWMP_SEQ_GT(rann->rann_seq, hr->hr_seq) && rann->rann_ttl > 1 && 1273 rann->rann_hopcount < hs->hs_maxhops && 1274 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) { 1275 memcpy(&prann, rann, sizeof(prann)); 1276 prann.rann_hopcount += 1; 1277 prann.rann_ttl -= 1; 1278 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni); 1279 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, broadcastaddr, 1280 &prann); 1281 } 1282} 1283 1284static int 1285hwmp_send_rann(struct ieee80211_node *ni, 1286 const uint8_t sa[IEEE80211_ADDR_LEN], 1287 const uint8_t da[IEEE80211_ADDR_LEN], 1288 struct ieee80211_meshrann_ie *rann) 1289{ 1290 /* 1291 * mesh rann action frame format 1292 * [6] da 1293 * [6] sa 1294 * [6] addr3 = sa 1295 * [1] action 1296 * [1] category 1297 * [tlv] root annoucement 1298 */ 1299 rann->rann_ie = IEEE80211_ELEMID_MESHRANN; 1300 return hwmp_send_action(ni, sa, da, (uint8_t *)rann, 1301 sizeof(struct ieee80211_meshrann_ie)); 1302} 1303 1304#define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags 1305#define PREQ_TADDR(n) preq.preq_targets[n].target_addr 1306#define PREQ_TSEQ(n) preq.preq_targets[n].target_seq 1307static struct ieee80211_node * 1308hwmp_discover(struct ieee80211vap *vap, 1309 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m) 1310{ 1311 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1312 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1313 struct ieee80211_mesh_route *rt = NULL; 1314 struct ieee80211_hwmp_route *hr; 1315 struct ieee80211_meshpreq_ie preq; 1316 struct ieee80211_node *ni; 1317 int sendpreq = 0; 1318 1319 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1320 ("not a mesh vap, opmode %d", vap->iv_opmode)); 1321 1322 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest), 1323 ("%s: discovering self!", __func__)); 1324 1325 ni = NULL; 1326 if (!IEEE80211_IS_MULTICAST(dest)) { 1327 rt = ieee80211_mesh_rt_find(vap, dest); 1328 if (rt == NULL) { 1329 rt = ieee80211_mesh_rt_add(vap, dest); 1330 if (rt == NULL) { 1331 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, 1332 ni, "unable to add discovery path to %s", 1333 ether_sprintf(dest)); 1334 vap->iv_stats.is_mesh_rtaddfailed++; 1335 goto done; 1336 } 1337 } 1338 hr = IEEE80211_MESH_ROUTE_PRIV(rt, 1339 struct ieee80211_hwmp_route); 1340 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) { 1341 if (hr->hr_targetseq == 0) 1342 hr->hr_targetseq = ++hs->hs_seq; 1343 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL; 1344 rt->rt_lifetime = 1345 ticks_to_msecs(ieee80211_hwmp_pathtimeout); 1346 /* XXX check preq retries */ 1347 sendpreq = 1; 1348 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1349 "start path discovery (src %s)", 1350 m == NULL ? "<none>" : ether_sprintf( 1351 mtod(m, struct ether_header *)->ether_shost)); 1352 /* 1353 * Try to discover the path for this node. 1354 */ 1355 preq.preq_flags = 0; 1356 preq.preq_hopcount = 0; 1357 preq.preq_ttl = ms->ms_ttl; 1358 preq.preq_id = ++hs->hs_preqid; 1359 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr); 1360 preq.preq_origseq = hr->hr_targetseq; 1361 preq.preq_lifetime = rt->rt_lifetime; 1362 preq.preq_metric = rt->rt_metric; 1363 preq.preq_tcount = 1; 1364 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest); 1365 PREQ_TFLAGS(0) = 0; 1366 if (ieee80211_hwmp_targetonly) 1367 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO; 1368 if (ieee80211_hwmp_replyforward) 1369 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_RF; 1370 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN; 1371 PREQ_TSEQ(0) = 0; 1372 /* XXX check return value */ 1373 hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, 1374 broadcastaddr, &preq); 1375 } 1376 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) 1377 ni = ieee80211_find_txnode(vap, rt->rt_nexthop); 1378 } else { 1379 ni = ieee80211_find_txnode(vap, dest); 1380 /* NB: if null then we leak mbuf */ 1381 KASSERT(ni != NULL, ("leak mcast frame")); 1382 return ni; 1383 } 1384done: 1385 if (ni == NULL && m != NULL) { 1386 if (sendpreq) { 1387 struct ieee80211com *ic = vap->iv_ic; 1388 /* 1389 * Queue packet for transmit when path discovery 1390 * completes. If discovery never completes the 1391 * frame will be flushed by way of the aging timer. 1392 */ 1393 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest, 1394 "%s", "queue frame until path found"); 1395 m->m_pkthdr.rcvif = (void *)(uintptr_t) 1396 ieee80211_mac_hash(ic, dest); 1397 /* XXX age chosen randomly */ 1398 ieee80211_ageq_append(&ic->ic_stageq, m, 1399 IEEE80211_INACT_WAIT); 1400 } else { 1401 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP, 1402 dest, NULL, "%s", "no valid path to this node"); 1403 m_freem(m); 1404 } 1405 } 1406 return ni; 1407} 1408#undef PREQ_TFLAGS 1409#undef PREQ_TADDR 1410#undef PREQ_TSEQ 1411 1412static int 1413hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 1414{ 1415 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1416 int error; 1417 1418 if (vap->iv_opmode != IEEE80211_M_MBSS) 1419 return ENOSYS; 1420 error = 0; 1421 switch (ireq->i_type) { 1422 case IEEE80211_IOC_HWMP_ROOTMODE: 1423 ireq->i_val = hs->hs_rootmode; 1424 break; 1425 case IEEE80211_IOC_HWMP_MAXHOPS: 1426 ireq->i_val = hs->hs_maxhops; 1427 break; 1428 default: 1429 return ENOSYS; 1430 } 1431 return error; 1432} 1433IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211); 1434 1435static int 1436hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 1437{ 1438 struct ieee80211_hwmp_state *hs = vap->iv_hwmp; 1439 int error; 1440 1441 if (vap->iv_opmode != IEEE80211_M_MBSS) 1442 return ENOSYS; 1443 error = 0; 1444 switch (ireq->i_type) { 1445 case IEEE80211_IOC_HWMP_ROOTMODE: 1446 if (ireq->i_val < 0 || ireq->i_val > 3) 1447 return EINVAL; 1448 hs->hs_rootmode = ireq->i_val; 1449 hwmp_rootmode_setup(vap); 1450 break; 1451 case IEEE80211_IOC_HWMP_MAXHOPS: 1452 if (ireq->i_val <= 0 || ireq->i_val > 255) 1453 return EINVAL; 1454 hs->hs_maxhops = ireq->i_val; 1455 break; 1456 default: 1457 return ENOSYS; 1458 } 1459 return error; 1460} 1461IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211); 1462