1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include <sys/cdefs.h> 29#ifdef __FreeBSD__ 30__FBSDID("$FreeBSD: releng/12.0/sys/net80211/ieee80211_adhoc.c 326272 2017-11-27 15:23:17Z pfg $"); 31#endif 32 33/* 34 * IEEE 802.11 IBSS mode support. 35 */ 36#include "opt_inet.h" 37#include "opt_wlan.h" 38 39#include <sys/param.h> 40#include <sys/systm.h> 41#include <sys/mbuf.h> 42#include <sys/malloc.h> 43#include <sys/kernel.h> 44 45#include <sys/socket.h> 46#include <sys/sockio.h> 47#include <sys/endian.h> 48#include <sys/errno.h> 49#include <sys/proc.h> 50#include <sys/sysctl.h> 51 52#include <net/if.h> 53#include <net/if_var.h> 54#include <net/if_media.h> 55#include <net/if_llc.h> 56#include <net/ethernet.h> 57 58#include <net/bpf.h> 59 60#include <net80211/ieee80211_var.h> 61#include <net80211/ieee80211_adhoc.h> 62#include <net80211/ieee80211_input.h> 63#ifdef IEEE80211_SUPPORT_SUPERG 64#include <net80211/ieee80211_superg.h> 65#endif 66#ifdef IEEE80211_SUPPORT_TDMA 67#include <net80211/ieee80211_tdma.h> 68#endif 69#include <net80211/ieee80211_sta.h> 70 71#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 72 73static void adhoc_vattach(struct ieee80211vap *); 74static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); 75static int adhoc_input(struct ieee80211_node *, struct mbuf *, 76 const struct ieee80211_rx_stats *, int, int); 77static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 78 int subtype, const struct ieee80211_rx_stats *, int, int); 79static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 80 int subtype, const struct ieee80211_rx_stats *rxs, int, int); 81static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 82 83void 84ieee80211_adhoc_attach(struct ieee80211com *ic) 85{ 86 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach; 87 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach; 88} 89 90void 91ieee80211_adhoc_detach(struct ieee80211com *ic) 92{ 93} 94 95static void 96adhoc_vdetach(struct ieee80211vap *vap) 97{ 98} 99 100static void 101adhoc_vattach(struct ieee80211vap *vap) 102{ 103 vap->iv_newstate = adhoc_newstate; 104 vap->iv_input = adhoc_input; 105 if (vap->iv_opmode == IEEE80211_M_IBSS) 106 vap->iv_recv_mgmt = adhoc_recv_mgmt; 107 else 108 vap->iv_recv_mgmt = ahdemo_recv_mgmt; 109 vap->iv_recv_ctl = adhoc_recv_ctl; 110 vap->iv_opdetach = adhoc_vdetach; 111#ifdef IEEE80211_SUPPORT_TDMA 112 /* 113 * Throw control to tdma support. Note we do this 114 * after setting up our callbacks so it can piggyback 115 * on top of us. 116 */ 117 if (vap->iv_caps & IEEE80211_C_TDMA) 118 ieee80211_tdma_vattach(vap); 119#endif 120} 121 122static void 123sta_leave(void *arg, struct ieee80211_node *ni) 124{ 125 struct ieee80211vap *vap = ni->ni_vap; 126 127 if (ni != vap->iv_bss) 128 ieee80211_node_leave(ni); 129} 130 131/* 132 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler. 133 */ 134static int 135adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 136{ 137 struct ieee80211com *ic = vap->iv_ic; 138 struct ieee80211_node *ni; 139 enum ieee80211_state ostate; 140 141 IEEE80211_LOCK_ASSERT(vap->iv_ic); 142 143 ostate = vap->iv_state; 144 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 145 __func__, ieee80211_state_name[ostate], 146 ieee80211_state_name[nstate], arg); 147 vap->iv_state = nstate; /* state transition */ 148 if (ostate != IEEE80211_S_SCAN) 149 ieee80211_cancel_scan(vap); /* background scan */ 150 ni = vap->iv_bss; /* NB: no reference held */ 151 switch (nstate) { 152 case IEEE80211_S_INIT: 153 switch (ostate) { 154 case IEEE80211_S_SCAN: 155 ieee80211_cancel_scan(vap); 156 break; 157 default: 158 break; 159 } 160 if (ostate != IEEE80211_S_INIT) { 161 /* NB: optimize INIT -> INIT case */ 162 ieee80211_reset_bss(vap); 163 } 164 break; 165 case IEEE80211_S_SCAN: 166 switch (ostate) { 167 case IEEE80211_S_RUN: /* beacon miss */ 168 /* purge station table; entries are stale */ 169 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap, 170 sta_leave, NULL); 171 /* fall thru... */ 172 case IEEE80211_S_INIT: 173 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 174 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 175 /* 176 * Already have a channel; bypass the 177 * scan and startup immediately. 178 */ 179 ieee80211_create_ibss(vap, 180 ieee80211_ht_adjust_channel(ic, 181 vap->iv_des_chan, vap->iv_flags_ht)); 182 break; 183 } 184 /* 185 * Initiate a scan. We can come here as a result 186 * of an IEEE80211_IOC_SCAN_REQ too in which case 187 * the vap will be marked with IEEE80211_FEXT_SCANREQ 188 * and the scan request parameters will be present 189 * in iv_scanreq. Otherwise we do the default. 190 */ 191 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 192 ieee80211_check_scan(vap, 193 vap->iv_scanreq_flags, 194 vap->iv_scanreq_duration, 195 vap->iv_scanreq_mindwell, 196 vap->iv_scanreq_maxdwell, 197 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 198 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 199 } else 200 ieee80211_check_scan_current(vap); 201 break; 202 case IEEE80211_S_SCAN: 203 /* 204 * This can happen because of a change in state 205 * that requires a reset. Trigger a new scan 206 * unless we're in manual roaming mode in which 207 * case an application must issue an explicit request. 208 */ 209 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 210 ieee80211_check_scan_current(vap); 211 break; 212 default: 213 goto invalid; 214 } 215 break; 216 case IEEE80211_S_RUN: 217 if (vap->iv_flags & IEEE80211_F_WPA) { 218 /* XXX validate prerequisites */ 219 } 220 switch (ostate) { 221 case IEEE80211_S_INIT: 222 /* 223 * Already have a channel; bypass the 224 * scan and startup immediately. 225 * Note that ieee80211_create_ibss will call 226 * back to do a RUN->RUN state change. 227 */ 228 ieee80211_create_ibss(vap, 229 ieee80211_ht_adjust_channel(ic, 230 ic->ic_curchan, vap->iv_flags_ht)); 231 /* NB: iv_bss is changed on return */ 232 ni = vap->iv_bss; 233 break; 234 case IEEE80211_S_SCAN: 235#ifdef IEEE80211_DEBUG 236 if (ieee80211_msg_debug(vap)) { 237 ieee80211_note(vap, 238 "synchronized with %s ssid ", 239 ether_sprintf(ni->ni_bssid)); 240 ieee80211_print_essid(vap->iv_bss->ni_essid, 241 ni->ni_esslen); 242 /* XXX MCS/HT */ 243 printf(" channel %d start %uMb\n", 244 ieee80211_chan2ieee(ic, ic->ic_curchan), 245 IEEE80211_RATE2MBS(ni->ni_txrate)); 246 } 247#endif 248 break; 249 case IEEE80211_S_RUN: /* IBSS merge */ 250 break; 251 default: 252 goto invalid; 253 } 254 /* 255 * When 802.1x is not in use mark the port authorized 256 * at this point so traffic can flow. 257 */ 258 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 259 ieee80211_node_authorize(ni); 260 /* 261 * Fake association when joining an existing bss. 262 */ 263 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 264 ic->ic_newassoc != NULL) 265 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 266 break; 267 case IEEE80211_S_SLEEP: 268 vap->iv_sta_ps(vap, 0); 269 break; 270 default: 271 invalid: 272 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 273 "%s: unexpected state transition %s -> %s\n", __func__, 274 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 275 break; 276 } 277 return 0; 278} 279 280/* 281 * Decide if a received management frame should be 282 * printed when debugging is enabled. This filters some 283 * of the less interesting frames that come frequently 284 * (e.g. beacons). 285 */ 286static __inline int 287doprint(struct ieee80211vap *vap, int subtype) 288{ 289 switch (subtype) { 290 case IEEE80211_FC0_SUBTYPE_BEACON: 291 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 292 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 293 return 1; 294 } 295 return 1; 296} 297 298/* 299 * Process a received frame. The node associated with the sender 300 * should be supplied. If nothing was found in the node table then 301 * the caller is assumed to supply a reference to iv_bss instead. 302 * The RSSI and a timestamp are also supplied. The RSSI data is used 303 * during AP scanning to select a AP to associate with; it can have 304 * any units so long as values have consistent units and higher values 305 * mean ``better signal''. The receive timestamp is currently not used 306 * by the 802.11 layer. 307 */ 308static int 309adhoc_input(struct ieee80211_node *ni, struct mbuf *m, 310 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 311{ 312 struct ieee80211vap *vap = ni->ni_vap; 313 struct ieee80211com *ic = ni->ni_ic; 314 struct ifnet *ifp = vap->iv_ifp; 315 struct ieee80211_frame *wh; 316 struct ieee80211_key *key; 317 struct ether_header *eh; 318 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 319 uint8_t dir, type, subtype, qos; 320 uint8_t *bssid; 321 int is_hw_decrypted = 0; 322 int has_decrypted = 0; 323 324 /* 325 * Some devices do hardware decryption all the way through 326 * to pretending the frame wasn't encrypted in the first place. 327 * So, tag it appropriately so it isn't discarded inappropriately. 328 */ 329 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 330 is_hw_decrypted = 1; 331 332 if (m->m_flags & M_AMPDU_MPDU) { 333 /* 334 * Fastpath for A-MPDU reorder q resubmission. Frames 335 * w/ M_AMPDU_MPDU marked have already passed through 336 * here but were received out of order and been held on 337 * the reorder queue. When resubmitted they are marked 338 * with the M_AMPDU_MPDU flag and we can bypass most of 339 * the normal processing. 340 */ 341 wh = mtod(m, struct ieee80211_frame *); 342 type = IEEE80211_FC0_TYPE_DATA; 343 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 344 subtype = IEEE80211_FC0_SUBTYPE_QOS; 345 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 346 goto resubmit_ampdu; 347 } 348 349 KASSERT(ni != NULL, ("null node")); 350 ni->ni_inact = ni->ni_inact_reload; 351 352 type = -1; /* undefined */ 353 354 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 355 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 356 ni->ni_macaddr, NULL, 357 "too short (1): len %u", m->m_pkthdr.len); 358 vap->iv_stats.is_rx_tooshort++; 359 goto out; 360 } 361 /* 362 * Bit of a cheat here, we use a pointer for a 3-address 363 * frame format but don't reference fields past outside 364 * ieee80211_frame_min w/o first validating the data is 365 * present. 366 */ 367 wh = mtod(m, struct ieee80211_frame *); 368 369 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 370 IEEE80211_FC0_VERSION_0) { 371 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 372 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 373 wh->i_fc[0], wh->i_fc[1]); 374 vap->iv_stats.is_rx_badversion++; 375 goto err; 376 } 377 378 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 379 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 380 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 381 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 382 if (dir != IEEE80211_FC1_DIR_NODS) 383 bssid = wh->i_addr1; 384 else if (type == IEEE80211_FC0_TYPE_CTL) 385 bssid = wh->i_addr1; 386 else { 387 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 388 IEEE80211_DISCARD_MAC(vap, 389 IEEE80211_MSG_ANY, ni->ni_macaddr, 390 NULL, "too short (2): len %u", 391 m->m_pkthdr.len); 392 vap->iv_stats.is_rx_tooshort++; 393 goto out; 394 } 395 bssid = wh->i_addr3; 396 } 397 /* 398 * Validate the bssid. 399 */ 400 if (!(type == IEEE80211_FC0_TYPE_MGT && 401 (subtype == IEEE80211_FC0_SUBTYPE_BEACON || 402 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) && 403 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 404 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 405 /* not interested in */ 406 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 407 bssid, NULL, "%s", "not to bss"); 408 vap->iv_stats.is_rx_wrongbss++; 409 goto out; 410 } 411 /* 412 * Data frame, cons up a node when it doesn't 413 * exist. This should probably done after an ACL check. 414 */ 415 if (type == IEEE80211_FC0_TYPE_DATA && 416 ni == vap->iv_bss && 417 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 418 /* 419 * Beware of frames that come in too early; we 420 * can receive broadcast frames and creating sta 421 * entries will blow up because there is no bss 422 * channel yet. 423 */ 424 if (vap->iv_state != IEEE80211_S_RUN) { 425 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 426 wh, "data", "not in RUN state (%s)", 427 ieee80211_state_name[vap->iv_state]); 428 vap->iv_stats.is_rx_badstate++; 429 goto err; 430 } 431 /* 432 * Fake up a node for this newly discovered member 433 * of the IBSS. 434 * 435 * Note: This doesn't "upgrade" the node to 11n; 436 * that will happen after a probe request/response 437 * exchange. 438 */ 439 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 440 if (ni == NULL) { 441 /* NB: stat kept for alloc failure */ 442 goto err; 443 } 444 } 445 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 446 ni->ni_noise = nf; 447 if (IEEE80211_HAS_SEQ(type, subtype) && 448 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 449 uint8_t tid = ieee80211_gettid(wh); 450 if (IEEE80211_QOS_HAS_SEQ(wh) && 451 TID_TO_WME_AC(tid) >= WME_AC_VI) 452 ic->ic_wme.wme_hipri_traffic++; 453 if (! ieee80211_check_rxseq(ni, wh, bssid, rxs)) 454 goto out; 455 } 456 } 457 458 switch (type) { 459 case IEEE80211_FC0_TYPE_DATA: 460 hdrspace = ieee80211_hdrspace(ic, wh); 461 if (m->m_len < hdrspace && 462 (m = m_pullup(m, hdrspace)) == NULL) { 463 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 464 ni->ni_macaddr, NULL, 465 "data too short: expecting %u", hdrspace); 466 vap->iv_stats.is_rx_tooshort++; 467 goto out; /* XXX */ 468 } 469 if (dir != IEEE80211_FC1_DIR_NODS) { 470 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 471 wh, "data", "incorrect dir 0x%x", dir); 472 vap->iv_stats.is_rx_wrongdir++; 473 goto out; 474 } 475 /* XXX no power-save support */ 476 477 /* 478 * Handle A-MPDU re-ordering. If the frame is to be 479 * processed directly then ieee80211_ampdu_reorder 480 * will return 0; otherwise it has consumed the mbuf 481 * and we should do nothing more with it. 482 */ 483 if ((m->m_flags & M_AMPDU) && 484 ieee80211_ampdu_reorder(ni, m, rxs) != 0) { 485 m = NULL; 486 goto out; 487 } 488 resubmit_ampdu: 489 490 /* 491 * Handle privacy requirements. Note that we 492 * must not be preempted from here until after 493 * we (potentially) call ieee80211_crypto_demic; 494 * otherwise we may violate assumptions in the 495 * crypto cipher modules used to do delayed update 496 * of replay sequence numbers. 497 */ 498 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 499 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 500 /* 501 * Discard encrypted frames when privacy is off. 502 */ 503 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 504 wh, "WEP", "%s", "PRIVACY off"); 505 vap->iv_stats.is_rx_noprivacy++; 506 IEEE80211_NODE_STAT(ni, rx_noprivacy); 507 goto out; 508 } 509 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 510 /* NB: stats+msgs handled in crypto_decap */ 511 IEEE80211_NODE_STAT(ni, rx_wepfail); 512 goto out; 513 } 514 wh = mtod(m, struct ieee80211_frame *); 515 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 516 has_decrypted = 1; 517 } else { 518 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 519 key = NULL; 520 } 521 522 /* 523 * Save QoS bits for use below--before we strip the header. 524 */ 525 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) 526 qos = ieee80211_getqos(wh)[0]; 527 else 528 qos = 0; 529 530 /* 531 * Next up, any fragmentation. 532 */ 533 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 534 m = ieee80211_defrag(ni, m, hdrspace); 535 if (m == NULL) { 536 /* Fragment dropped or frame not complete yet */ 537 goto out; 538 } 539 } 540 wh = NULL; /* no longer valid, catch any uses */ 541 542 /* 543 * Next strip any MSDU crypto bits. 544 */ 545 if (!ieee80211_crypto_demic(vap, key, m, 0)) { 546 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 547 ni->ni_macaddr, "data", "%s", "demic error"); 548 vap->iv_stats.is_rx_demicfail++; 549 IEEE80211_NODE_STAT(ni, rx_demicfail); 550 goto out; 551 } 552 553 /* copy to listener after decrypt */ 554 if (ieee80211_radiotap_active_vap(vap)) 555 ieee80211_radiotap_rx(vap, m); 556 need_tap = 0; 557 558 /* 559 * Finally, strip the 802.11 header. 560 */ 561 m = ieee80211_decap(vap, m, hdrspace); 562 if (m == NULL) { 563 /* XXX mask bit to check for both */ 564 /* don't count Null data frames as errors */ 565 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 566 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 567 goto out; 568 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 569 ni->ni_macaddr, "data", "%s", "decap error"); 570 vap->iv_stats.is_rx_decap++; 571 IEEE80211_NODE_STAT(ni, rx_decap); 572 goto err; 573 } 574 eh = mtod(m, struct ether_header *); 575 if (!ieee80211_node_is_authorized(ni)) { 576 /* 577 * Deny any non-PAE frames received prior to 578 * authorization. For open/shared-key 579 * authentication the port is mark authorized 580 * after authentication completes. For 802.1x 581 * the port is not marked authorized by the 582 * authenticator until the handshake has completed. 583 */ 584 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 585 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 586 eh->ether_shost, "data", 587 "unauthorized port: ether type 0x%x len %u", 588 eh->ether_type, m->m_pkthdr.len); 589 vap->iv_stats.is_rx_unauth++; 590 IEEE80211_NODE_STAT(ni, rx_unauth); 591 goto err; 592 } 593 } else { 594 /* 595 * When denying unencrypted frames, discard 596 * any non-PAE frames received without encryption. 597 */ 598 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 599 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) && 600 (is_hw_decrypted == 0) && 601 eh->ether_type != htons(ETHERTYPE_PAE)) { 602 /* 603 * Drop unencrypted frames. 604 */ 605 vap->iv_stats.is_rx_unencrypted++; 606 IEEE80211_NODE_STAT(ni, rx_unencrypted); 607 goto out; 608 } 609 } 610 /* XXX require HT? */ 611 if (qos & IEEE80211_QOS_AMSDU) { 612 m = ieee80211_decap_amsdu(ni, m); 613 if (m == NULL) 614 return IEEE80211_FC0_TYPE_DATA; 615 } else { 616#ifdef IEEE80211_SUPPORT_SUPERG 617 m = ieee80211_decap_fastframe(vap, ni, m); 618 if (m == NULL) 619 return IEEE80211_FC0_TYPE_DATA; 620#endif 621 } 622 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 623 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 624 else 625 ieee80211_deliver_data(vap, ni, m); 626 return IEEE80211_FC0_TYPE_DATA; 627 628 case IEEE80211_FC0_TYPE_MGT: 629 vap->iv_stats.is_rx_mgmt++; 630 IEEE80211_NODE_STAT(ni, rx_mgmt); 631 if (dir != IEEE80211_FC1_DIR_NODS) { 632 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 633 wh, "data", "incorrect dir 0x%x", dir); 634 vap->iv_stats.is_rx_wrongdir++; 635 goto err; 636 } 637 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 638 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 639 ni->ni_macaddr, "mgt", "too short: len %u", 640 m->m_pkthdr.len); 641 vap->iv_stats.is_rx_tooshort++; 642 goto out; 643 } 644#ifdef IEEE80211_DEBUG 645 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 646 ieee80211_msg_dumppkts(vap)) { 647 if_printf(ifp, "received %s from %s rssi %d\n", 648 ieee80211_mgt_subtype_name(subtype), 649 ether_sprintf(wh->i_addr2), rssi); 650 } 651#endif 652 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 653 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 654 wh, NULL, "%s", "WEP set but not permitted"); 655 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 656 goto out; 657 } 658 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 659 goto out; 660 661 case IEEE80211_FC0_TYPE_CTL: 662 vap->iv_stats.is_rx_ctl++; 663 IEEE80211_NODE_STAT(ni, rx_ctrl); 664 vap->iv_recv_ctl(ni, m, subtype); 665 goto out; 666 667 default: 668 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 669 wh, "bad", "frame type 0x%x", type); 670 /* should not come here */ 671 break; 672 } 673err: 674 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 675out: 676 if (m != NULL) { 677 if (need_tap && ieee80211_radiotap_active_vap(vap)) 678 ieee80211_radiotap_rx(vap, m); 679 m_freem(m); 680 } 681 return type; 682} 683 684static int 685is11bclient(const uint8_t *rates, const uint8_t *xrates) 686{ 687 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 688 int i; 689 690 /* NB: the 11b clients we care about will not have xrates */ 691 if (xrates != NULL || rates == NULL) 692 return 0; 693 for (i = 0; i < rates[1]; i++) { 694 int r = rates[2+i] & IEEE80211_RATE_VAL; 695 if (r > 2*11 || ((1<<r) & brates) == 0) 696 return 0; 697 } 698 return 1; 699} 700 701static void 702adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 703 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 704{ 705 struct ieee80211vap *vap = ni->ni_vap; 706 struct ieee80211com *ic = ni->ni_ic; 707 struct ieee80211_channel *rxchan = ic->ic_curchan; 708 struct ieee80211_frame *wh; 709 uint8_t *frm, *efrm; 710 uint8_t *ssid, *rates, *xrates; 711#if 0 712 int ht_state_change = 0; 713#endif 714 715 wh = mtod(m0, struct ieee80211_frame *); 716 frm = (uint8_t *)&wh[1]; 717 efrm = mtod(m0, uint8_t *) + m0->m_len; 718 719 IEEE80211_DPRINTF(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG, 720 "%s: recv mgmt frame, addr2=%6D, ni=%p (%6D) fc=%.02x %.02x\n", 721 __func__, 722 wh->i_addr2, ":", 723 ni, 724 ni->ni_macaddr, ":", 725 wh->i_fc[0], 726 wh->i_fc[1]); 727 switch (subtype) { 728 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 729 case IEEE80211_FC0_SUBTYPE_BEACON: { 730 struct ieee80211_scanparams scan; 731 struct ieee80211_channel *c; 732 /* 733 * We process beacon/probe response 734 * frames to discover neighbors. 735 */ 736 if (rxs != NULL) { 737 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 738 if (c != NULL) 739 rxchan = c; 740 } 741 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) 742 return; 743 /* 744 * Count frame now that we know it's to be processed. 745 */ 746 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 747 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 748 IEEE80211_NODE_STAT(ni, rx_beacons); 749 } else 750 IEEE80211_NODE_STAT(ni, rx_proberesp); 751 /* 752 * If scanning, just pass information to the scan module. 753 */ 754 if (ic->ic_flags & IEEE80211_F_SCAN) { 755 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 756 /* 757 * Actively scanning a channel marked passive; 758 * send a probe request now that we know there 759 * is 802.11 traffic present. 760 * 761 * XXX check if the beacon we recv'd gives 762 * us what we need and suppress the probe req 763 */ 764 ieee80211_probe_curchan(vap, 1); 765 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 766 } 767 ieee80211_add_scan(vap, rxchan, &scan, wh, 768 subtype, rssi, nf); 769 return; 770 } 771 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 772 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 773 /* 774 * Create a new entry in the neighbor table. 775 * 776 * XXX TODO: 777 * 778 * Here we're not scanning; so if we have an 779 * SSID then make sure it matches our SSID. 780 * Otherwise this code will match on all IBSS 781 * beacons/probe requests for all SSIDs, 782 * filling the node table with nodes that 783 * aren't ours. 784 */ 785 if (ieee80211_ibss_node_check_new(ni, &scan)) { 786 ni = ieee80211_add_neighbor(vap, wh, &scan); 787 /* 788 * Send a probe request so we announce 11n 789 * capabilities. 790 */ 791 ieee80211_send_probereq(ni, /* node */ 792 vap->iv_myaddr, /* SA */ 793 ni->ni_macaddr, /* DA */ 794 vap->iv_bss->ni_bssid, /* BSSID */ 795 vap->iv_bss->ni_essid, 796 vap->iv_bss->ni_esslen); /* SSID */ 797 } else 798 ni = NULL; 799 800 /* 801 * Send a probe request so we announce 11n 802 * capabilities. 803 * 804 * Don't do this if we're scanning. 805 */ 806 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 807 ieee80211_send_probereq(ni, /* node */ 808 vap->iv_myaddr, /* SA */ 809 ni->ni_macaddr, /* DA */ 810 vap->iv_bss->ni_bssid, /* BSSID */ 811 vap->iv_bss->ni_essid, 812 vap->iv_bss->ni_esslen); /* SSID */ 813 814 } else if (ni->ni_capinfo == 0) { 815 /* 816 * Update faked node created on transmit. 817 * Note this also updates the tsf. 818 */ 819 ieee80211_init_neighbor(ni, wh, &scan); 820 821 /* 822 * Send a probe request so we announce 11n 823 * capabilities. 824 */ 825 ieee80211_send_probereq(ni, /* node */ 826 vap->iv_myaddr, /* SA */ 827 ni->ni_macaddr, /* DA */ 828 vap->iv_bss->ni_bssid, /* BSSID */ 829 vap->iv_bss->ni_essid, 830 vap->iv_bss->ni_esslen); /* SSID */ 831 } else { 832 /* 833 * Record tsf for potential resync. 834 */ 835 memcpy(ni->ni_tstamp.data, scan.tstamp, 836 sizeof(ni->ni_tstamp)); 837 } 838 /* 839 * This isn't enabled yet - otherwise it would 840 * update the HT parameters and channel width 841 * from any node, which could lead to lots of 842 * strange behaviour if the 11n nodes aren't 843 * exactly configured to match. 844 */ 845#if 0 846 if (scan.htcap != NULL && scan.htinfo != NULL && 847 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 848 ieee80211_ht_updateparams(ni, 849 scan.htcap, scan.htinfo)); 850 if (ieee80211_ht_updateparams_final(ni, 851 scan.htcap, scan.htinfo)) 852 ht_state_change = 1; 853 } 854 855 /* XXX same for VHT? */ 856#endif 857 if (ni != NULL) { 858 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 859 ni->ni_noise = nf; 860 } 861 /* 862 * Same here - the channel width change should 863 * be applied to the specific peer node, not 864 * to the ic. Ie, the interface configuration 865 * should stay in its current channel width; 866 * but it should change the rate control and 867 * any queued frames for the given node only. 868 * 869 * Since there's no (current) way to inform 870 * the driver that a channel width change has 871 * occurred for a single node, just stub this 872 * out. 873 */ 874#if 0 875 if (ht_state_change) 876 ieee80211_update_chw(ic); 877#endif 878 } 879 break; 880 } 881 882 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 883 if (vap->iv_state != IEEE80211_S_RUN) { 884 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 885 wh, NULL, "wrong state %s", 886 ieee80211_state_name[vap->iv_state]); 887 vap->iv_stats.is_rx_mgtdiscard++; 888 return; 889 } 890 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 891 /* frame must be directed */ 892 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 893 wh, NULL, "%s", "not unicast"); 894 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 895 return; 896 } 897 898 /* 899 * prreq frame format 900 * [tlv] ssid 901 * [tlv] supported rates 902 * [tlv] extended supported rates 903 */ 904 ssid = rates = xrates = NULL; 905 while (efrm - frm > 1) { 906 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 907 switch (*frm) { 908 case IEEE80211_ELEMID_SSID: 909 ssid = frm; 910 break; 911 case IEEE80211_ELEMID_RATES: 912 rates = frm; 913 break; 914 case IEEE80211_ELEMID_XRATES: 915 xrates = frm; 916 break; 917 } 918 frm += frm[1] + 2; 919 } 920 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 921 if (xrates != NULL) 922 IEEE80211_VERIFY_ELEMENT(xrates, 923 IEEE80211_RATE_MAXSIZE - rates[1], return); 924 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 925 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 926 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 927 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 928 wh, NULL, 929 "%s", "no ssid with ssid suppression enabled"); 930 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 931 return; 932 } 933 934 /* XXX find a better class or define it's own */ 935 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 936 "%s", "recv probe req"); 937 /* 938 * Some legacy 11b clients cannot hack a complete 939 * probe response frame. When the request includes 940 * only a bare-bones rate set, communicate this to 941 * the transmit side. 942 */ 943 ieee80211_send_proberesp(vap, wh->i_addr2, 944 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 945 946 /* 947 * Note: we don't benefit from stashing the probe request 948 * IEs away to use for IBSS negotiation, because we 949 * typically don't get all of the IEs. 950 */ 951 break; 952 953 case IEEE80211_FC0_SUBTYPE_ACTION: 954 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 955 if ((ni == vap->iv_bss) && 956 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 957 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 958 wh, NULL, "%s", "unknown node"); 959 vap->iv_stats.is_rx_mgtdiscard++; 960 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 961 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 962 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG, 963 wh, NULL, "%s", "not for us"); 964 vap->iv_stats.is_rx_mgtdiscard++; 965 } else if (vap->iv_state != IEEE80211_S_RUN) { 966 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG, 967 wh, NULL, "wrong state %s", 968 ieee80211_state_name[vap->iv_state]); 969 vap->iv_stats.is_rx_mgtdiscard++; 970 } else { 971 if (ieee80211_parse_action(ni, m0) == 0) 972 (void)ic->ic_recv_action(ni, wh, frm, efrm); 973 } 974 break; 975 976 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 977 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 978 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 979 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 980 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 981 case IEEE80211_FC0_SUBTYPE_ATIM: 982 case IEEE80211_FC0_SUBTYPE_DISASSOC: 983 case IEEE80211_FC0_SUBTYPE_AUTH: 984 case IEEE80211_FC0_SUBTYPE_DEAUTH: 985 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 986 wh, NULL, "%s", "not handled"); 987 vap->iv_stats.is_rx_mgtdiscard++; 988 break; 989 990 default: 991 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 992 wh, "mgt", "subtype 0x%x not handled", subtype); 993 vap->iv_stats.is_rx_badsubtype++; 994 break; 995 } 996} 997#undef IEEE80211_VERIFY_LENGTH 998#undef IEEE80211_VERIFY_ELEMENT 999 1000static void 1001ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1002 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 1003{ 1004 struct ieee80211vap *vap = ni->ni_vap; 1005 struct ieee80211com *ic = ni->ni_ic; 1006 struct ieee80211_frame *wh; 1007 1008 /* 1009 * Process management frames when scanning; useful for doing 1010 * a site-survey. 1011 */ 1012 if (ic->ic_flags & IEEE80211_F_SCAN) 1013 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf); 1014 else { 1015 wh = mtod(m0, struct ieee80211_frame *); 1016 switch (subtype) { 1017 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1018 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1019 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1020 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1021 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1022 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1023 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 1024 case IEEE80211_FC0_SUBTYPE_BEACON: 1025 case IEEE80211_FC0_SUBTYPE_ATIM: 1026 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1027 case IEEE80211_FC0_SUBTYPE_AUTH: 1028 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1029 case IEEE80211_FC0_SUBTYPE_ACTION: 1030 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1031 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1032 wh, NULL, "%s", "not handled"); 1033 vap->iv_stats.is_rx_mgtdiscard++; 1034 break; 1035 default: 1036 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1037 wh, "mgt", "subtype 0x%x not handled", subtype); 1038 vap->iv_stats.is_rx_badsubtype++; 1039 break; 1040 } 1041 } 1042} 1043 1044static void 1045adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1046{ 1047 1048 switch (subtype) { 1049 case IEEE80211_FC0_SUBTYPE_BAR: 1050 ieee80211_recv_bar(ni, m); 1051 break; 1052 } 1053} 1054