ieee80211_adhoc.c revision 191546
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 191546 2009-04-26 21:46:04Z sam $"); 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 67#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 68 69static void adhoc_vattach(struct ieee80211vap *); 70static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); 71static int adhoc_input(struct ieee80211_node *, struct mbuf *, 72 int rssi, int noise, uint32_t rstamp); 73static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 74 int subtype, int rssi, int noise, uint32_t rstamp); 75static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, int rssi, int noise, uint32_t rstamp); 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 ieee80211_sta_pwrsave(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, 288 int rssi, int noise, uint32_t rstamp) 289{ 290#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 291#define HAS_SEQ(type) ((type & 0x4) == 0) 292 struct ieee80211vap *vap = ni->ni_vap; 293 struct ieee80211com *ic = ni->ni_ic; 294 struct ifnet *ifp = vap->iv_ifp; 295 struct ieee80211_frame *wh; 296 struct ieee80211_key *key; 297 struct ether_header *eh; 298 int hdrspace, need_tap; 299 uint8_t dir, type, subtype, qos; 300 uint8_t *bssid; 301 uint16_t rxseq; 302 303 if (m->m_flags & M_AMPDU_MPDU) { 304 /* 305 * Fastpath for A-MPDU reorder q resubmission. Frames 306 * w/ M_AMPDU_MPDU marked have already passed through 307 * here but were received out of order and been held on 308 * the reorder queue. When resubmitted they are marked 309 * with the M_AMPDU_MPDU flag and we can bypass most of 310 * the normal processing. 311 */ 312 wh = mtod(m, struct ieee80211_frame *); 313 type = IEEE80211_FC0_TYPE_DATA; 314 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 315 subtype = IEEE80211_FC0_SUBTYPE_QOS; 316 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 317 goto resubmit_ampdu; 318 } 319 320 KASSERT(ni != NULL, ("null node")); 321 ni->ni_inact = ni->ni_inact_reload; 322 323 need_tap = 1; /* mbuf need to be tapped. */ 324 type = -1; /* undefined */ 325 326 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 327 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 328 ni->ni_macaddr, NULL, 329 "too short (1): len %u", m->m_pkthdr.len); 330 vap->iv_stats.is_rx_tooshort++; 331 goto out; 332 } 333 /* 334 * Bit of a cheat here, we use a pointer for a 3-address 335 * frame format but don't reference fields past outside 336 * ieee80211_frame_min w/o first validating the data is 337 * present. 338 */ 339 wh = mtod(m, struct ieee80211_frame *); 340 341 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 342 IEEE80211_FC0_VERSION_0) { 343 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 344 ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]); 345 vap->iv_stats.is_rx_badversion++; 346 goto err; 347 } 348 349 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 350 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 351 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 352 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 353 if (dir != IEEE80211_FC1_DIR_NODS) 354 bssid = wh->i_addr1; 355 else if (type == IEEE80211_FC0_TYPE_CTL) 356 bssid = wh->i_addr1; 357 else { 358 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 359 IEEE80211_DISCARD_MAC(vap, 360 IEEE80211_MSG_ANY, ni->ni_macaddr, 361 NULL, "too short (2): len %u", 362 m->m_pkthdr.len); 363 vap->iv_stats.is_rx_tooshort++; 364 goto out; 365 } 366 bssid = wh->i_addr3; 367 } 368 /* 369 * Validate the bssid. 370 */ 371 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 372 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 373 /* not interested in */ 374 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 375 bssid, NULL, "%s", "not to bss"); 376 vap->iv_stats.is_rx_wrongbss++; 377 goto out; 378 } 379 /* 380 * Data frame, cons up a node when it doesn't 381 * exist. This should probably done after an ACL check. 382 */ 383 if (type == IEEE80211_FC0_TYPE_DATA && 384 ni == vap->iv_bss && 385 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 386 /* 387 * Beware of frames that come in too early; we 388 * can receive broadcast frames and creating sta 389 * entries will blow up because there is no bss 390 * channel yet. 391 */ 392 if (vap->iv_state != IEEE80211_S_RUN) { 393 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 394 wh, "data", "not in RUN state (%s)", 395 ieee80211_state_name[vap->iv_state]); 396 vap->iv_stats.is_rx_badstate++; 397 goto err; 398 } 399 /* 400 * Fake up a node for this newly 401 * discovered member of the IBSS. 402 */ 403 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 404 if (ni == NULL) { 405 /* NB: stat kept for alloc failure */ 406 goto err; 407 } 408 } 409 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 410 ni->ni_noise = noise; 411 ni->ni_rstamp = rstamp; 412 if (HAS_SEQ(type)) { 413 uint8_t tid = ieee80211_gettid(wh); 414 if (IEEE80211_QOS_HAS_SEQ(wh) && 415 TID_TO_WME_AC(tid) >= WME_AC_VI) 416 ic->ic_wme.wme_hipri_traffic++; 417 rxseq = le16toh(*(uint16_t *)wh->i_seq); 418 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 419 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 420 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 421 /* duplicate, discard */ 422 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 423 bssid, "duplicate", 424 "seqno <%u,%u> fragno <%u,%u> tid %u", 425 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 426 ni->ni_rxseqs[tid] >> 427 IEEE80211_SEQ_SEQ_SHIFT, 428 rxseq & IEEE80211_SEQ_FRAG_MASK, 429 ni->ni_rxseqs[tid] & 430 IEEE80211_SEQ_FRAG_MASK, 431 tid); 432 vap->iv_stats.is_rx_dup++; 433 IEEE80211_NODE_STAT(ni, rx_dup); 434 goto out; 435 } 436 ni->ni_rxseqs[tid] = rxseq; 437 } 438 } 439 440 switch (type) { 441 case IEEE80211_FC0_TYPE_DATA: 442 hdrspace = ieee80211_hdrspace(ic, wh); 443 if (m->m_len < hdrspace && 444 (m = m_pullup(m, hdrspace)) == NULL) { 445 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 446 ni->ni_macaddr, NULL, 447 "data too short: expecting %u", hdrspace); 448 vap->iv_stats.is_rx_tooshort++; 449 goto out; /* XXX */ 450 } 451 if (dir != IEEE80211_FC1_DIR_NODS) { 452 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 453 wh, "data", "incorrect dir 0x%x", dir); 454 vap->iv_stats.is_rx_wrongdir++; 455 goto out; 456 } 457 /* XXX no power-save support */ 458 459 /* 460 * Handle A-MPDU re-ordering. If the frame is to be 461 * processed directly then ieee80211_ampdu_reorder 462 * will return 0; otherwise it has consumed the mbuf 463 * and we should do nothing more with it. 464 */ 465 if ((m->m_flags & M_AMPDU) && 466 ieee80211_ampdu_reorder(ni, m) != 0) { 467 m = NULL; 468 goto out; 469 } 470 resubmit_ampdu: 471 472 /* 473 * Handle privacy requirements. Note that we 474 * must not be preempted from here until after 475 * we (potentially) call ieee80211_crypto_demic; 476 * otherwise we may violate assumptions in the 477 * crypto cipher modules used to do delayed update 478 * of replay sequence numbers. 479 */ 480 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 481 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 482 /* 483 * Discard encrypted frames when privacy is off. 484 */ 485 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 486 wh, "WEP", "%s", "PRIVACY off"); 487 vap->iv_stats.is_rx_noprivacy++; 488 IEEE80211_NODE_STAT(ni, rx_noprivacy); 489 goto out; 490 } 491 key = ieee80211_crypto_decap(ni, m, hdrspace); 492 if (key == NULL) { 493 /* NB: stats+msgs handled in crypto_decap */ 494 IEEE80211_NODE_STAT(ni, rx_wepfail); 495 goto out; 496 } 497 wh = mtod(m, struct ieee80211_frame *); 498 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 499 } else { 500 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 501 key = NULL; 502 } 503 504 /* 505 * Save QoS bits for use below--before we strip the header. 506 */ 507 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 508 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 509 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 510 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 511 } else 512 qos = 0; 513 514 /* 515 * Next up, any fragmentation. 516 */ 517 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 518 m = ieee80211_defrag(ni, m, hdrspace); 519 if (m == NULL) { 520 /* Fragment dropped or frame not complete yet */ 521 goto out; 522 } 523 } 524 wh = NULL; /* no longer valid, catch any uses */ 525 526 /* 527 * Next strip any MSDU crypto bits. 528 */ 529 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 530 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 531 ni->ni_macaddr, "data", "%s", "demic error"); 532 vap->iv_stats.is_rx_demicfail++; 533 IEEE80211_NODE_STAT(ni, rx_demicfail); 534 goto out; 535 } 536 537 /* copy to listener after decrypt */ 538 if (bpf_peers_present(vap->iv_rawbpf)) 539 bpf_mtap(vap->iv_rawbpf, m); 540 need_tap = 0; 541 542 /* 543 * Finally, strip the 802.11 header. 544 */ 545 m = ieee80211_decap(vap, m, hdrspace); 546 if (m == NULL) { 547 /* XXX mask bit to check for both */ 548 /* don't count Null data frames as errors */ 549 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 550 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 551 goto out; 552 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 553 ni->ni_macaddr, "data", "%s", "decap error"); 554 vap->iv_stats.is_rx_decap++; 555 IEEE80211_NODE_STAT(ni, rx_decap); 556 goto err; 557 } 558 eh = mtod(m, struct ether_header *); 559 if (!ieee80211_node_is_authorized(ni)) { 560 /* 561 * Deny any non-PAE frames received prior to 562 * authorization. For open/shared-key 563 * authentication the port is mark authorized 564 * after authentication completes. For 802.1x 565 * the port is not marked authorized by the 566 * authenticator until the handshake has completed. 567 */ 568 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 569 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 570 eh->ether_shost, "data", 571 "unauthorized port: ether type 0x%x len %u", 572 eh->ether_type, m->m_pkthdr.len); 573 vap->iv_stats.is_rx_unauth++; 574 IEEE80211_NODE_STAT(ni, rx_unauth); 575 goto err; 576 } 577 } else { 578 /* 579 * When denying unencrypted frames, discard 580 * any non-PAE frames received without encryption. 581 */ 582 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 583 (key == NULL && (m->m_flags & M_WEP) == 0) && 584 eh->ether_type != htons(ETHERTYPE_PAE)) { 585 /* 586 * Drop unencrypted frames. 587 */ 588 vap->iv_stats.is_rx_unencrypted++; 589 IEEE80211_NODE_STAT(ni, rx_unencrypted); 590 goto out; 591 } 592 } 593 /* XXX require HT? */ 594 if (qos & IEEE80211_QOS_AMSDU) { 595 m = ieee80211_decap_amsdu(ni, m); 596 if (m == NULL) 597 return IEEE80211_FC0_TYPE_DATA; 598 } else { 599#ifdef IEEE80211_SUPPORT_SUPERG 600 m = ieee80211_decap_fastframe(vap, ni, m); 601 if (m == NULL) 602 return IEEE80211_FC0_TYPE_DATA; 603#endif 604 } 605 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 606 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 607 else 608 ieee80211_deliver_data(vap, ni, m); 609 return IEEE80211_FC0_TYPE_DATA; 610 611 case IEEE80211_FC0_TYPE_MGT: 612 vap->iv_stats.is_rx_mgmt++; 613 IEEE80211_NODE_STAT(ni, rx_mgmt); 614 if (dir != IEEE80211_FC1_DIR_NODS) { 615 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 616 wh, "data", "incorrect dir 0x%x", dir); 617 vap->iv_stats.is_rx_wrongdir++; 618 goto err; 619 } 620 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 621 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 622 ni->ni_macaddr, "mgt", "too short: len %u", 623 m->m_pkthdr.len); 624 vap->iv_stats.is_rx_tooshort++; 625 goto out; 626 } 627#ifdef IEEE80211_DEBUG 628 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 629 ieee80211_msg_dumppkts(vap)) { 630 if_printf(ifp, "received %s from %s rssi %d\n", 631 ieee80211_mgt_subtype_name[subtype >> 632 IEEE80211_FC0_SUBTYPE_SHIFT], 633 ether_sprintf(wh->i_addr2), rssi); 634 } 635#endif 636 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 637 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 638 wh, NULL, "%s", "WEP set but not permitted"); 639 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 640 goto out; 641 } 642 vap->iv_recv_mgmt(ni, m, subtype, rssi, noise, rstamp); 643 goto out; 644 645 case IEEE80211_FC0_TYPE_CTL: 646 vap->iv_stats.is_rx_ctl++; 647 IEEE80211_NODE_STAT(ni, rx_ctrl); 648 vap->iv_recv_ctl(ni, m, subtype); 649 goto out; 650 default: 651 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 652 wh, "bad", "frame type 0x%x", type); 653 /* should not come here */ 654 break; 655 } 656err: 657 ifp->if_ierrors++; 658out: 659 if (m != NULL) { 660 if (need_tap && bpf_peers_present(vap->iv_rawbpf)) 661 bpf_mtap(vap->iv_rawbpf, m); 662 m_freem(m); 663 } 664 return type; 665#undef SEQ_LEQ 666} 667 668static int 669is11bclient(const uint8_t *rates, const uint8_t *xrates) 670{ 671 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 672 int i; 673 674 /* NB: the 11b clients we care about will not have xrates */ 675 if (xrates != NULL || rates == NULL) 676 return 0; 677 for (i = 0; i < rates[1]; i++) { 678 int r = rates[2+i] & IEEE80211_RATE_VAL; 679 if (r > 2*11 || ((1<<r) & brates) == 0) 680 return 0; 681 } 682 return 1; 683} 684 685static void 686adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 687 int subtype, int rssi, int noise, uint32_t rstamp) 688{ 689 struct ieee80211vap *vap = ni->ni_vap; 690 struct ieee80211com *ic = ni->ni_ic; 691 struct ieee80211_frame *wh; 692 uint8_t *frm, *efrm, *sfrm; 693 uint8_t *ssid, *rates, *xrates; 694 695 wh = mtod(m0, struct ieee80211_frame *); 696 frm = (uint8_t *)&wh[1]; 697 efrm = mtod(m0, uint8_t *) + m0->m_len; 698 switch (subtype) { 699 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 700 case IEEE80211_FC0_SUBTYPE_BEACON: { 701 struct ieee80211_scanparams scan; 702 /* 703 * We process beacon/probe response 704 * frames to discover neighbors. 705 */ 706 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 707 return; 708 /* 709 * Count frame now that we know it's to be processed. 710 */ 711 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 712 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 713 IEEE80211_NODE_STAT(ni, rx_beacons); 714 } else 715 IEEE80211_NODE_STAT(ni, rx_proberesp); 716 /* 717 * If scanning, just pass information to the scan module. 718 */ 719 if (ic->ic_flags & IEEE80211_F_SCAN) { 720 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 721 /* 722 * Actively scanning a channel marked passive; 723 * send a probe request now that we know there 724 * is 802.11 traffic present. 725 * 726 * XXX check if the beacon we recv'd gives 727 * us what we need and suppress the probe req 728 */ 729 ieee80211_probe_curchan(vap, 1); 730 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 731 } 732 ieee80211_add_scan(vap, &scan, wh, 733 subtype, rssi, noise, rstamp); 734 return; 735 } 736 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 737 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 738 /* 739 * Create a new entry in the neighbor table. 740 */ 741 ni = ieee80211_add_neighbor(vap, wh, &scan); 742 } else if (ni->ni_capinfo == 0) { 743 /* 744 * Update faked node created on transmit. 745 * Note this also updates the tsf. 746 */ 747 ieee80211_init_neighbor(ni, wh, &scan); 748 } else { 749 /* 750 * Record tsf for potential resync. 751 */ 752 memcpy(ni->ni_tstamp.data, scan.tstamp, 753 sizeof(ni->ni_tstamp)); 754 } 755 if (ni != NULL) { 756 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 757 ni->ni_noise = noise; 758 ni->ni_rstamp = rstamp; 759 } 760 } 761 break; 762 } 763 764 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 765 if (vap->iv_state != IEEE80211_S_RUN) { 766 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 767 wh, NULL, "wrong state %s", 768 ieee80211_state_name[vap->iv_state]); 769 vap->iv_stats.is_rx_mgtdiscard++; 770 return; 771 } 772 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 773 /* frame must be directed */ 774 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 775 wh, NULL, "%s", "not unicast"); 776 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 777 return; 778 } 779 780 /* 781 * prreq frame format 782 * [tlv] ssid 783 * [tlv] supported rates 784 * [tlv] extended supported rates 785 */ 786 ssid = rates = xrates = NULL; 787 sfrm = frm; 788 while (efrm - frm > 1) { 789 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 790 switch (*frm) { 791 case IEEE80211_ELEMID_SSID: 792 ssid = frm; 793 break; 794 case IEEE80211_ELEMID_RATES: 795 rates = frm; 796 break; 797 case IEEE80211_ELEMID_XRATES: 798 xrates = frm; 799 break; 800 } 801 frm += frm[1] + 2; 802 } 803 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 804 if (xrates != NULL) 805 IEEE80211_VERIFY_ELEMENT(xrates, 806 IEEE80211_RATE_MAXSIZE - rates[1], return); 807 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 808 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 809 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 810 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 811 wh, NULL, 812 "%s", "no ssid with ssid suppression enabled"); 813 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 814 return; 815 } 816 817 /* XXX find a better class or define it's own */ 818 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 819 "%s", "recv probe req"); 820 /* 821 * Some legacy 11b clients cannot hack a complete 822 * probe response frame. When the request includes 823 * only a bare-bones rate set, communicate this to 824 * the transmit side. 825 */ 826 ieee80211_send_proberesp(vap, wh->i_addr2, 827 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 828 break; 829 830 case IEEE80211_FC0_SUBTYPE_ACTION: { 831 const struct ieee80211_action *ia; 832 833 if (vap->iv_state != IEEE80211_S_RUN) { 834 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 835 wh, NULL, "wrong state %s", 836 ieee80211_state_name[vap->iv_state]); 837 vap->iv_stats.is_rx_mgtdiscard++; 838 return; 839 } 840 /* 841 * action frame format: 842 * [1] category 843 * [1] action 844 * [tlv] parameters 845 */ 846 IEEE80211_VERIFY_LENGTH(efrm - frm, 847 sizeof(struct ieee80211_action), return); 848 ia = (const struct ieee80211_action *) frm; 849 850 vap->iv_stats.is_rx_action++; 851 IEEE80211_NODE_STAT(ni, rx_action); 852 853 /* verify frame payloads but defer processing */ 854 /* XXX maybe push this to method */ 855 switch (ia->ia_category) { 856 case IEEE80211_ACTION_CAT_BA: 857 switch (ia->ia_action) { 858 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 859 IEEE80211_VERIFY_LENGTH(efrm - frm, 860 sizeof(struct ieee80211_action_ba_addbarequest), 861 return); 862 break; 863 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 864 IEEE80211_VERIFY_LENGTH(efrm - frm, 865 sizeof(struct ieee80211_action_ba_addbaresponse), 866 return); 867 break; 868 case IEEE80211_ACTION_BA_DELBA: 869 IEEE80211_VERIFY_LENGTH(efrm - frm, 870 sizeof(struct ieee80211_action_ba_delba), 871 return); 872 break; 873 } 874 break; 875 case IEEE80211_ACTION_CAT_HT: 876 switch (ia->ia_action) { 877 case IEEE80211_ACTION_HT_TXCHWIDTH: 878 IEEE80211_VERIFY_LENGTH(efrm - frm, 879 sizeof(struct ieee80211_action_ht_txchwidth), 880 return); 881 break; 882 } 883 break; 884 } 885 ic->ic_recv_action(ni, frm, efrm); 886 break; 887 } 888 889 case IEEE80211_FC0_SUBTYPE_AUTH: 890 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 891 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 892 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 893 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 894 case IEEE80211_FC0_SUBTYPE_DEAUTH: 895 case IEEE80211_FC0_SUBTYPE_DISASSOC: 896 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 897 wh, NULL, "%s", "not handled"); 898 vap->iv_stats.is_rx_mgtdiscard++; 899 return; 900 901 default: 902 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 903 wh, "mgt", "subtype 0x%x not handled", subtype); 904 vap->iv_stats.is_rx_badsubtype++; 905 break; 906 } 907} 908#undef IEEE80211_VERIFY_LENGTH 909#undef IEEE80211_VERIFY_ELEMENT 910 911static void 912ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 913 int subtype, int rssi, int noise, uint32_t rstamp) 914{ 915 struct ieee80211vap *vap = ni->ni_vap; 916 struct ieee80211com *ic = ni->ni_ic; 917 918 /* 919 * Process management frames when scanning; useful for doing 920 * a site-survey. 921 */ 922 if (ic->ic_flags & IEEE80211_F_SCAN) 923 adhoc_recv_mgmt(ni, m0, subtype, rssi, noise, rstamp); 924 else 925 vap->iv_stats.is_rx_mgtdiscard++; 926} 927 928static void 929adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) 930{ 931} 932