ieee80211_adhoc.c revision 244061
1/*- 2 * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include <sys/cdefs.h> 27#ifdef __FreeBSD__ 28__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_adhoc.c 244061 2012-12-09 23:56:29Z adrian $"); 29#endif 30 31/* 32 * IEEE 802.11 IBSS mode support. 33 */ 34#include "opt_inet.h" 35#include "opt_wlan.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/mbuf.h> 40#include <sys/malloc.h> 41#include <sys/kernel.h> 42 43#include <sys/socket.h> 44#include <sys/sockio.h> 45#include <sys/endian.h> 46#include <sys/errno.h> 47#include <sys/proc.h> 48#include <sys/sysctl.h> 49 50#include <net/if.h> 51#include <net/if_media.h> 52#include <net/if_llc.h> 53#include <net/ethernet.h> 54 55#include <net/bpf.h> 56 57#include <net80211/ieee80211_var.h> 58#include <net80211/ieee80211_adhoc.h> 59#include <net80211/ieee80211_input.h> 60#ifdef IEEE80211_SUPPORT_SUPERG 61#include <net80211/ieee80211_superg.h> 62#endif 63#ifdef IEEE80211_SUPPORT_TDMA 64#include <net80211/ieee80211_tdma.h> 65#endif 66#include <net80211/ieee80211_sta.h> 67 68#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 69 70static void adhoc_vattach(struct ieee80211vap *); 71static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); 72static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int); 73static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 74 int subtype, int, int); 75static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, int, int); 77static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 78 79void 80ieee80211_adhoc_attach(struct ieee80211com *ic) 81{ 82 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach; 83 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach; 84} 85 86void 87ieee80211_adhoc_detach(struct ieee80211com *ic) 88{ 89} 90 91static void 92adhoc_vdetach(struct ieee80211vap *vap) 93{ 94} 95 96static void 97adhoc_vattach(struct ieee80211vap *vap) 98{ 99 vap->iv_newstate = adhoc_newstate; 100 vap->iv_input = adhoc_input; 101 if (vap->iv_opmode == IEEE80211_M_IBSS) 102 vap->iv_recv_mgmt = adhoc_recv_mgmt; 103 else 104 vap->iv_recv_mgmt = ahdemo_recv_mgmt; 105 vap->iv_recv_ctl = adhoc_recv_ctl; 106 vap->iv_opdetach = adhoc_vdetach; 107#ifdef IEEE80211_SUPPORT_TDMA 108 /* 109 * Throw control to tdma support. Note we do this 110 * after setting up our callbacks so it can piggyback 111 * on top of us. 112 */ 113 if (vap->iv_caps & IEEE80211_C_TDMA) 114 ieee80211_tdma_vattach(vap); 115#endif 116} 117 118static void 119sta_leave(void *arg, struct ieee80211_node *ni) 120{ 121 struct ieee80211vap *vap = arg; 122 123 if (ni->ni_vap == vap && ni != vap->iv_bss) 124 ieee80211_node_leave(ni); 125} 126 127/* 128 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler. 129 */ 130static int 131adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 132{ 133 struct ieee80211com *ic = vap->iv_ic; 134 struct ieee80211_node *ni; 135 enum ieee80211_state ostate; 136 137 IEEE80211_LOCK_ASSERT(vap->iv_ic); 138 139 ostate = vap->iv_state; 140 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 141 __func__, ieee80211_state_name[ostate], 142 ieee80211_state_name[nstate], arg); 143 vap->iv_state = nstate; /* state transition */ 144 if (ostate != IEEE80211_S_SCAN) 145 ieee80211_cancel_scan(vap); /* background scan */ 146 ni = vap->iv_bss; /* NB: no reference held */ 147 switch (nstate) { 148 case IEEE80211_S_INIT: 149 switch (ostate) { 150 case IEEE80211_S_SCAN: 151 ieee80211_cancel_scan(vap); 152 break; 153 default: 154 break; 155 } 156 if (ostate != IEEE80211_S_INIT) { 157 /* NB: optimize INIT -> INIT case */ 158 ieee80211_reset_bss(vap); 159 } 160 break; 161 case IEEE80211_S_SCAN: 162 switch (ostate) { 163 case IEEE80211_S_RUN: /* beacon miss */ 164 /* purge station table; entries are stale */ 165 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap); 166 /* fall thru... */ 167 case IEEE80211_S_INIT: 168 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 169 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 170 /* 171 * Already have a channel; bypass the 172 * scan and startup immediately. 173 */ 174 ieee80211_create_ibss(vap, vap->iv_des_chan); 175 break; 176 } 177 /* 178 * Initiate a scan. We can come here as a result 179 * of an IEEE80211_IOC_SCAN_REQ too in which case 180 * the vap will be marked with IEEE80211_FEXT_SCANREQ 181 * and the scan request parameters will be present 182 * in iv_scanreq. Otherwise we do the default. 183 */ 184 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 185 ieee80211_check_scan(vap, 186 vap->iv_scanreq_flags, 187 vap->iv_scanreq_duration, 188 vap->iv_scanreq_mindwell, 189 vap->iv_scanreq_maxdwell, 190 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 191 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 192 } else 193 ieee80211_check_scan_current(vap); 194 break; 195 case IEEE80211_S_SCAN: 196 /* 197 * This can happen because of a change in state 198 * that requires a reset. Trigger a new scan 199 * unless we're in manual roaming mode in which 200 * case an application must issue an explicit request. 201 */ 202 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 203 ieee80211_check_scan_current(vap); 204 break; 205 default: 206 goto invalid; 207 } 208 break; 209 case IEEE80211_S_RUN: 210 if (vap->iv_flags & IEEE80211_F_WPA) { 211 /* XXX validate prerequisites */ 212 } 213 switch (ostate) { 214 case IEEE80211_S_SCAN: 215#ifdef IEEE80211_DEBUG 216 if (ieee80211_msg_debug(vap)) { 217 ieee80211_note(vap, 218 "synchronized with %s ssid ", 219 ether_sprintf(ni->ni_bssid)); 220 ieee80211_print_essid(vap->iv_bss->ni_essid, 221 ni->ni_esslen); 222 /* XXX MCS/HT */ 223 printf(" channel %d start %uMb\n", 224 ieee80211_chan2ieee(ic, ic->ic_curchan), 225 IEEE80211_RATE2MBS(ni->ni_txrate)); 226 } 227#endif 228 break; 229 default: 230 goto invalid; 231 } 232 /* 233 * When 802.1x is not in use mark the port authorized 234 * at this point so traffic can flow. 235 */ 236 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 237 ieee80211_node_authorize(ni); 238 /* 239 * Fake association when joining an existing bss. 240 */ 241 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 242 ic->ic_newassoc != NULL) 243 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 244 break; 245 case IEEE80211_S_SLEEP: 246 vap->iv_sta_ps(vap, 0); 247 break; 248 default: 249 invalid: 250 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 251 "%s: unexpected state transition %s -> %s\n", __func__, 252 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 253 break; 254 } 255 return 0; 256} 257 258/* 259 * Decide if a received management frame should be 260 * printed when debugging is enabled. This filters some 261 * of the less interesting frames that come frequently 262 * (e.g. beacons). 263 */ 264static __inline int 265doprint(struct ieee80211vap *vap, int subtype) 266{ 267 switch (subtype) { 268 case IEEE80211_FC0_SUBTYPE_BEACON: 269 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 270 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 271 return 1; 272 } 273 return 1; 274} 275 276/* 277 * Process a received frame. The node associated with the sender 278 * should be supplied. If nothing was found in the node table then 279 * the caller is assumed to supply a reference to iv_bss instead. 280 * The RSSI and a timestamp are also supplied. The RSSI data is used 281 * during AP scanning to select a AP to associate with; it can have 282 * any units so long as values have consistent units and higher values 283 * mean ``better signal''. The receive timestamp is currently not used 284 * by the 802.11 layer. 285 */ 286static int 287adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 288{ 289#define HAS_SEQ(type) ((type & 0x4) == 0) 290 struct ieee80211vap *vap = ni->ni_vap; 291 struct ieee80211com *ic = ni->ni_ic; 292 struct ifnet *ifp = vap->iv_ifp; 293 struct ieee80211_frame *wh; 294 struct ieee80211_key *key; 295 struct ether_header *eh; 296 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 297 uint8_t dir, type, subtype, qos; 298 uint8_t *bssid; 299 uint16_t rxseq; 300 301 if (m->m_flags & M_AMPDU_MPDU) { 302 /* 303 * Fastpath for A-MPDU reorder q resubmission. Frames 304 * w/ M_AMPDU_MPDU marked have already passed through 305 * here but were received out of order and been held on 306 * the reorder queue. When resubmitted they are marked 307 * with the M_AMPDU_MPDU flag and we can bypass most of 308 * the normal processing. 309 */ 310 wh = mtod(m, struct ieee80211_frame *); 311 type = IEEE80211_FC0_TYPE_DATA; 312 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 313 subtype = IEEE80211_FC0_SUBTYPE_QOS; 314 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 315 goto resubmit_ampdu; 316 } 317 318 KASSERT(ni != NULL, ("null node")); 319 ni->ni_inact = ni->ni_inact_reload; 320 321 type = -1; /* undefined */ 322 323 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 324 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 325 ni->ni_macaddr, NULL, 326 "too short (1): len %u", m->m_pkthdr.len); 327 vap->iv_stats.is_rx_tooshort++; 328 goto out; 329 } 330 /* 331 * Bit of a cheat here, we use a pointer for a 3-address 332 * frame format but don't reference fields past outside 333 * ieee80211_frame_min w/o first validating the data is 334 * present. 335 */ 336 wh = mtod(m, struct ieee80211_frame *); 337 338 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 339 IEEE80211_FC0_VERSION_0) { 340 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 341 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 342 wh->i_fc[0], wh->i_fc[1]); 343 vap->iv_stats.is_rx_badversion++; 344 goto err; 345 } 346 347 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 348 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 349 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 350 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 351 if (dir != IEEE80211_FC1_DIR_NODS) 352 bssid = wh->i_addr1; 353 else if (type == IEEE80211_FC0_TYPE_CTL) 354 bssid = wh->i_addr1; 355 else { 356 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 357 IEEE80211_DISCARD_MAC(vap, 358 IEEE80211_MSG_ANY, ni->ni_macaddr, 359 NULL, "too short (2): len %u", 360 m->m_pkthdr.len); 361 vap->iv_stats.is_rx_tooshort++; 362 goto out; 363 } 364 bssid = wh->i_addr3; 365 } 366 /* 367 * Validate the bssid. 368 */ 369 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 370 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 371 /* not interested in */ 372 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 373 bssid, NULL, "%s", "not to bss"); 374 vap->iv_stats.is_rx_wrongbss++; 375 goto out; 376 } 377 /* 378 * Data frame, cons up a node when it doesn't 379 * exist. This should probably done after an ACL check. 380 */ 381 if (type == IEEE80211_FC0_TYPE_DATA && 382 ni == vap->iv_bss && 383 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 384 /* 385 * Beware of frames that come in too early; we 386 * can receive broadcast frames and creating sta 387 * entries will blow up because there is no bss 388 * channel yet. 389 */ 390 if (vap->iv_state != IEEE80211_S_RUN) { 391 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 392 wh, "data", "not in RUN state (%s)", 393 ieee80211_state_name[vap->iv_state]); 394 vap->iv_stats.is_rx_badstate++; 395 goto err; 396 } 397 /* 398 * Fake up a node for this newly 399 * discovered member of the IBSS. 400 */ 401 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 402 if (ni == NULL) { 403 /* NB: stat kept for alloc failure */ 404 goto err; 405 } 406 } 407 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 408 ni->ni_noise = nf; 409 if (HAS_SEQ(type)) { 410 uint8_t tid = ieee80211_gettid(wh); 411 if (IEEE80211_QOS_HAS_SEQ(wh) && 412 TID_TO_WME_AC(tid) >= WME_AC_VI) 413 ic->ic_wme.wme_hipri_traffic++; 414 rxseq = le16toh(*(uint16_t *)wh->i_seq); 415 if (! ieee80211_check_rxseq(ni, wh)) { 416 /* duplicate, discard */ 417 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 418 bssid, "duplicate", 419 "seqno <%u,%u> fragno <%u,%u> tid %u", 420 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 421 ni->ni_rxseqs[tid] >> 422 IEEE80211_SEQ_SEQ_SHIFT, 423 rxseq & IEEE80211_SEQ_FRAG_MASK, 424 ni->ni_rxseqs[tid] & 425 IEEE80211_SEQ_FRAG_MASK, 426 tid); 427 vap->iv_stats.is_rx_dup++; 428 IEEE80211_NODE_STAT(ni, rx_dup); 429 goto out; 430 } 431 ni->ni_rxseqs[tid] = rxseq; 432 } 433 } 434 435 switch (type) { 436 case IEEE80211_FC0_TYPE_DATA: 437 hdrspace = ieee80211_hdrspace(ic, wh); 438 if (m->m_len < hdrspace && 439 (m = m_pullup(m, hdrspace)) == NULL) { 440 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 441 ni->ni_macaddr, NULL, 442 "data too short: expecting %u", hdrspace); 443 vap->iv_stats.is_rx_tooshort++; 444 goto out; /* XXX */ 445 } 446 if (dir != IEEE80211_FC1_DIR_NODS) { 447 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 448 wh, "data", "incorrect dir 0x%x", dir); 449 vap->iv_stats.is_rx_wrongdir++; 450 goto out; 451 } 452 /* XXX no power-save support */ 453 454 /* 455 * Handle A-MPDU re-ordering. If the frame is to be 456 * processed directly then ieee80211_ampdu_reorder 457 * will return 0; otherwise it has consumed the mbuf 458 * and we should do nothing more with it. 459 */ 460 if ((m->m_flags & M_AMPDU) && 461 ieee80211_ampdu_reorder(ni, m) != 0) { 462 m = NULL; 463 goto out; 464 } 465 resubmit_ampdu: 466 467 /* 468 * Handle privacy requirements. Note that we 469 * must not be preempted from here until after 470 * we (potentially) call ieee80211_crypto_demic; 471 * otherwise we may violate assumptions in the 472 * crypto cipher modules used to do delayed update 473 * of replay sequence numbers. 474 */ 475 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 476 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 477 /* 478 * Discard encrypted frames when privacy is off. 479 */ 480 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 481 wh, "WEP", "%s", "PRIVACY off"); 482 vap->iv_stats.is_rx_noprivacy++; 483 IEEE80211_NODE_STAT(ni, rx_noprivacy); 484 goto out; 485 } 486 key = ieee80211_crypto_decap(ni, m, hdrspace); 487 if (key == NULL) { 488 /* NB: stats+msgs handled in crypto_decap */ 489 IEEE80211_NODE_STAT(ni, rx_wepfail); 490 goto out; 491 } 492 wh = mtod(m, struct ieee80211_frame *); 493 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 494 } else { 495 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 496 key = NULL; 497 } 498 499 /* 500 * Save QoS bits for use below--before we strip the header. 501 */ 502 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 503 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 504 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 505 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 506 } else 507 qos = 0; 508 509 /* 510 * Next up, any fragmentation. 511 */ 512 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 513 m = ieee80211_defrag(ni, m, hdrspace); 514 if (m == NULL) { 515 /* Fragment dropped or frame not complete yet */ 516 goto out; 517 } 518 } 519 wh = NULL; /* no longer valid, catch any uses */ 520 521 /* 522 * Next strip any MSDU crypto bits. 523 */ 524 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 525 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 526 ni->ni_macaddr, "data", "%s", "demic error"); 527 vap->iv_stats.is_rx_demicfail++; 528 IEEE80211_NODE_STAT(ni, rx_demicfail); 529 goto out; 530 } 531 532 /* copy to listener after decrypt */ 533 if (ieee80211_radiotap_active_vap(vap)) 534 ieee80211_radiotap_rx(vap, m); 535 need_tap = 0; 536 537 /* 538 * Finally, strip the 802.11 header. 539 */ 540 m = ieee80211_decap(vap, m, hdrspace); 541 if (m == NULL) { 542 /* XXX mask bit to check for both */ 543 /* don't count Null data frames as errors */ 544 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 545 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 546 goto out; 547 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 548 ni->ni_macaddr, "data", "%s", "decap error"); 549 vap->iv_stats.is_rx_decap++; 550 IEEE80211_NODE_STAT(ni, rx_decap); 551 goto err; 552 } 553 eh = mtod(m, struct ether_header *); 554 if (!ieee80211_node_is_authorized(ni)) { 555 /* 556 * Deny any non-PAE frames received prior to 557 * authorization. For open/shared-key 558 * authentication the port is mark authorized 559 * after authentication completes. For 802.1x 560 * the port is not marked authorized by the 561 * authenticator until the handshake has completed. 562 */ 563 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 564 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 565 eh->ether_shost, "data", 566 "unauthorized port: ether type 0x%x len %u", 567 eh->ether_type, m->m_pkthdr.len); 568 vap->iv_stats.is_rx_unauth++; 569 IEEE80211_NODE_STAT(ni, rx_unauth); 570 goto err; 571 } 572 } else { 573 /* 574 * When denying unencrypted frames, discard 575 * any non-PAE frames received without encryption. 576 */ 577 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 578 (key == NULL && (m->m_flags & M_WEP) == 0) && 579 eh->ether_type != htons(ETHERTYPE_PAE)) { 580 /* 581 * Drop unencrypted frames. 582 */ 583 vap->iv_stats.is_rx_unencrypted++; 584 IEEE80211_NODE_STAT(ni, rx_unencrypted); 585 goto out; 586 } 587 } 588 /* XXX require HT? */ 589 if (qos & IEEE80211_QOS_AMSDU) { 590 m = ieee80211_decap_amsdu(ni, m); 591 if (m == NULL) 592 return IEEE80211_FC0_TYPE_DATA; 593 } else { 594#ifdef IEEE80211_SUPPORT_SUPERG 595 m = ieee80211_decap_fastframe(vap, ni, m); 596 if (m == NULL) 597 return IEEE80211_FC0_TYPE_DATA; 598#endif 599 } 600 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 601 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 602 else 603 ieee80211_deliver_data(vap, ni, m); 604 return IEEE80211_FC0_TYPE_DATA; 605 606 case IEEE80211_FC0_TYPE_MGT: 607 vap->iv_stats.is_rx_mgmt++; 608 IEEE80211_NODE_STAT(ni, rx_mgmt); 609 if (dir != IEEE80211_FC1_DIR_NODS) { 610 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 611 wh, "data", "incorrect dir 0x%x", dir); 612 vap->iv_stats.is_rx_wrongdir++; 613 goto err; 614 } 615 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 616 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 617 ni->ni_macaddr, "mgt", "too short: len %u", 618 m->m_pkthdr.len); 619 vap->iv_stats.is_rx_tooshort++; 620 goto out; 621 } 622#ifdef IEEE80211_DEBUG 623 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 624 ieee80211_msg_dumppkts(vap)) { 625 if_printf(ifp, "received %s from %s rssi %d\n", 626 ieee80211_mgt_subtype_name[subtype >> 627 IEEE80211_FC0_SUBTYPE_SHIFT], 628 ether_sprintf(wh->i_addr2), rssi); 629 } 630#endif 631 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 632 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 633 wh, NULL, "%s", "WEP set but not permitted"); 634 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 635 goto out; 636 } 637 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 638 goto out; 639 640 case IEEE80211_FC0_TYPE_CTL: 641 vap->iv_stats.is_rx_ctl++; 642 IEEE80211_NODE_STAT(ni, rx_ctrl); 643 vap->iv_recv_ctl(ni, m, subtype); 644 goto out; 645 646 default: 647 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 648 wh, "bad", "frame type 0x%x", type); 649 /* should not come here */ 650 break; 651 } 652err: 653 ifp->if_ierrors++; 654out: 655 if (m != NULL) { 656 if (need_tap && ieee80211_radiotap_active_vap(vap)) 657 ieee80211_radiotap_rx(vap, m); 658 m_freem(m); 659 } 660 return type; 661} 662 663static int 664is11bclient(const uint8_t *rates, const uint8_t *xrates) 665{ 666 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 667 int i; 668 669 /* NB: the 11b clients we care about will not have xrates */ 670 if (xrates != NULL || rates == NULL) 671 return 0; 672 for (i = 0; i < rates[1]; i++) { 673 int r = rates[2+i] & IEEE80211_RATE_VAL; 674 if (r > 2*11 || ((1<<r) & brates) == 0) 675 return 0; 676 } 677 return 1; 678} 679 680static void 681adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 682 int subtype, int rssi, int nf) 683{ 684 struct ieee80211vap *vap = ni->ni_vap; 685 struct ieee80211com *ic = ni->ni_ic; 686 struct ieee80211_frame *wh; 687 uint8_t *frm, *efrm, *sfrm; 688 uint8_t *ssid, *rates, *xrates; 689 690 wh = mtod(m0, struct ieee80211_frame *); 691 frm = (uint8_t *)&wh[1]; 692 efrm = mtod(m0, uint8_t *) + m0->m_len; 693 switch (subtype) { 694 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 695 case IEEE80211_FC0_SUBTYPE_BEACON: { 696 struct ieee80211_scanparams scan; 697 /* 698 * We process beacon/probe response 699 * frames to discover neighbors. 700 */ 701 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 702 return; 703 /* 704 * Count frame now that we know it's to be processed. 705 */ 706 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 707 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 708 IEEE80211_NODE_STAT(ni, rx_beacons); 709 } else 710 IEEE80211_NODE_STAT(ni, rx_proberesp); 711 /* 712 * If scanning, just pass information to the scan module. 713 */ 714 if (ic->ic_flags & IEEE80211_F_SCAN) { 715 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 716 /* 717 * Actively scanning a channel marked passive; 718 * send a probe request now that we know there 719 * is 802.11 traffic present. 720 * 721 * XXX check if the beacon we recv'd gives 722 * us what we need and suppress the probe req 723 */ 724 ieee80211_probe_curchan(vap, 1); 725 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 726 } 727 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 728 return; 729 } 730 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 731 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 732 /* 733 * Create a new entry in the neighbor table. 734 */ 735 ni = ieee80211_add_neighbor(vap, wh, &scan); 736 } else if (ni->ni_capinfo == 0) { 737 /* 738 * Update faked node created on transmit. 739 * Note this also updates the tsf. 740 */ 741 ieee80211_init_neighbor(ni, wh, &scan); 742 } else { 743 /* 744 * Record tsf for potential resync. 745 */ 746 memcpy(ni->ni_tstamp.data, scan.tstamp, 747 sizeof(ni->ni_tstamp)); 748 } 749 if (ni != NULL) { 750 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 751 ni->ni_noise = nf; 752 } 753 } 754 break; 755 } 756 757 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 758 if (vap->iv_state != IEEE80211_S_RUN) { 759 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 760 wh, NULL, "wrong state %s", 761 ieee80211_state_name[vap->iv_state]); 762 vap->iv_stats.is_rx_mgtdiscard++; 763 return; 764 } 765 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 766 /* frame must be directed */ 767 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 768 wh, NULL, "%s", "not unicast"); 769 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 770 return; 771 } 772 773 /* 774 * prreq frame format 775 * [tlv] ssid 776 * [tlv] supported rates 777 * [tlv] extended supported rates 778 */ 779 ssid = rates = xrates = NULL; 780 sfrm = frm; 781 while (efrm - frm > 1) { 782 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 783 switch (*frm) { 784 case IEEE80211_ELEMID_SSID: 785 ssid = frm; 786 break; 787 case IEEE80211_ELEMID_RATES: 788 rates = frm; 789 break; 790 case IEEE80211_ELEMID_XRATES: 791 xrates = frm; 792 break; 793 } 794 frm += frm[1] + 2; 795 } 796 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 797 if (xrates != NULL) 798 IEEE80211_VERIFY_ELEMENT(xrates, 799 IEEE80211_RATE_MAXSIZE - rates[1], return); 800 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 801 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 802 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 803 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 804 wh, NULL, 805 "%s", "no ssid with ssid suppression enabled"); 806 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 807 return; 808 } 809 810 /* XXX find a better class or define it's own */ 811 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 812 "%s", "recv probe req"); 813 /* 814 * Some legacy 11b clients cannot hack a complete 815 * probe response frame. When the request includes 816 * only a bare-bones rate set, communicate this to 817 * the transmit side. 818 */ 819 ieee80211_send_proberesp(vap, wh->i_addr2, 820 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 821 break; 822 823 case IEEE80211_FC0_SUBTYPE_ACTION: 824 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 825 if (ni == vap->iv_bss) { 826 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 827 wh, NULL, "%s", "unknown node"); 828 vap->iv_stats.is_rx_mgtdiscard++; 829 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 830 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 831 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 832 wh, NULL, "%s", "not for us"); 833 vap->iv_stats.is_rx_mgtdiscard++; 834 } else if (vap->iv_state != IEEE80211_S_RUN) { 835 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 836 wh, NULL, "wrong state %s", 837 ieee80211_state_name[vap->iv_state]); 838 vap->iv_stats.is_rx_mgtdiscard++; 839 } else { 840 if (ieee80211_parse_action(ni, m0) == 0) 841 (void)ic->ic_recv_action(ni, wh, frm, efrm); 842 } 843 break; 844 845 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 846 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 847 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 848 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 849 case IEEE80211_FC0_SUBTYPE_ATIM: 850 case IEEE80211_FC0_SUBTYPE_DISASSOC: 851 case IEEE80211_FC0_SUBTYPE_AUTH: 852 case IEEE80211_FC0_SUBTYPE_DEAUTH: 853 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 854 wh, NULL, "%s", "not handled"); 855 vap->iv_stats.is_rx_mgtdiscard++; 856 break; 857 858 default: 859 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 860 wh, "mgt", "subtype 0x%x not handled", subtype); 861 vap->iv_stats.is_rx_badsubtype++; 862 break; 863 } 864} 865#undef IEEE80211_VERIFY_LENGTH 866#undef IEEE80211_VERIFY_ELEMENT 867 868static void 869ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 870 int subtype, int rssi, int nf) 871{ 872 struct ieee80211vap *vap = ni->ni_vap; 873 struct ieee80211com *ic = ni->ni_ic; 874 struct ieee80211_frame *wh; 875 876 /* 877 * Process management frames when scanning; useful for doing 878 * a site-survey. 879 */ 880 if (ic->ic_flags & IEEE80211_F_SCAN) 881 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf); 882 else { 883 wh = mtod(m0, struct ieee80211_frame *); 884 switch (subtype) { 885 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 886 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 887 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 888 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 889 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 890 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 891 case IEEE80211_FC0_SUBTYPE_BEACON: 892 case IEEE80211_FC0_SUBTYPE_ATIM: 893 case IEEE80211_FC0_SUBTYPE_DISASSOC: 894 case IEEE80211_FC0_SUBTYPE_AUTH: 895 case IEEE80211_FC0_SUBTYPE_DEAUTH: 896 case IEEE80211_FC0_SUBTYPE_ACTION: 897 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 898 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 899 wh, NULL, "%s", "not handled"); 900 vap->iv_stats.is_rx_mgtdiscard++; 901 break; 902 default: 903 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 904 wh, "mgt", "subtype 0x%x not handled", subtype); 905 vap->iv_stats.is_rx_badsubtype++; 906 break; 907 } 908 } 909} 910 911static void 912adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 913{ 914 915 switch (subtype) { 916 case IEEE80211_FC0_SUBTYPE_BAR: 917 ieee80211_recv_bar(ni, m); 918 break; 919 } 920} 921