ieee80211_adhoc.c revision 192468
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 192468 2009-05-20 20:00:40Z 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 *, int, int); 72static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 73 int subtype, int, int); 74static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 75 int subtype, int, int); 76static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 77 78void 79ieee80211_adhoc_attach(struct ieee80211com *ic) 80{ 81 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach; 82 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach; 83} 84 85void 86ieee80211_adhoc_detach(struct ieee80211com *ic) 87{ 88} 89 90static void 91adhoc_vdetach(struct ieee80211vap *vap) 92{ 93} 94 95static void 96adhoc_vattach(struct ieee80211vap *vap) 97{ 98 vap->iv_newstate = adhoc_newstate; 99 vap->iv_input = adhoc_input; 100 if (vap->iv_opmode == IEEE80211_M_IBSS) 101 vap->iv_recv_mgmt = adhoc_recv_mgmt; 102 else 103 vap->iv_recv_mgmt = ahdemo_recv_mgmt; 104 vap->iv_recv_ctl = adhoc_recv_ctl; 105 vap->iv_opdetach = adhoc_vdetach; 106#ifdef IEEE80211_SUPPORT_TDMA 107 /* 108 * Throw control to tdma support. Note we do this 109 * after setting up our callbacks so it can piggyback 110 * on top of us. 111 */ 112 if (vap->iv_caps & IEEE80211_C_TDMA) 113 ieee80211_tdma_vattach(vap); 114#endif 115} 116 117static void 118sta_leave(void *arg, struct ieee80211_node *ni) 119{ 120 struct ieee80211vap *vap = arg; 121 122 if (ni->ni_vap == vap && ni != vap->iv_bss) 123 ieee80211_node_leave(ni); 124} 125 126/* 127 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler. 128 */ 129static int 130adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 131{ 132 struct ieee80211com *ic = vap->iv_ic; 133 struct ieee80211_node *ni; 134 enum ieee80211_state ostate; 135 136 IEEE80211_LOCK_ASSERT(vap->iv_ic); 137 138 ostate = vap->iv_state; 139 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 140 __func__, ieee80211_state_name[ostate], 141 ieee80211_state_name[nstate], arg); 142 vap->iv_state = nstate; /* state transition */ 143 if (ostate != IEEE80211_S_SCAN) 144 ieee80211_cancel_scan(vap); /* background scan */ 145 ni = vap->iv_bss; /* NB: no reference held */ 146 switch (nstate) { 147 case IEEE80211_S_INIT: 148 switch (ostate) { 149 case IEEE80211_S_SCAN: 150 ieee80211_cancel_scan(vap); 151 break; 152 default: 153 break; 154 } 155 if (ostate != IEEE80211_S_INIT) { 156 /* NB: optimize INIT -> INIT case */ 157 ieee80211_reset_bss(vap); 158 } 159 break; 160 case IEEE80211_S_SCAN: 161 switch (ostate) { 162 case IEEE80211_S_RUN: /* beacon miss */ 163 /* purge station table; entries are stale */ 164 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap); 165 /* fall thru... */ 166 case IEEE80211_S_INIT: 167 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 168 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 169 /* 170 * Already have a channel; bypass the 171 * scan and startup immediately. 172 */ 173 ieee80211_create_ibss(vap, vap->iv_des_chan); 174 break; 175 } 176 /* 177 * Initiate a scan. We can come here as a result 178 * of an IEEE80211_IOC_SCAN_REQ too in which case 179 * the vap will be marked with IEEE80211_FEXT_SCANREQ 180 * and the scan request parameters will be present 181 * in iv_scanreq. Otherwise we do the default. 182 */ 183 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 184 ieee80211_check_scan(vap, 185 vap->iv_scanreq_flags, 186 vap->iv_scanreq_duration, 187 vap->iv_scanreq_mindwell, 188 vap->iv_scanreq_maxdwell, 189 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 190 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 191 } else 192 ieee80211_check_scan_current(vap); 193 break; 194 case IEEE80211_S_SCAN: 195 /* 196 * This can happen because of a change in state 197 * that requires a reset. Trigger a new scan 198 * unless we're in manual roaming mode in which 199 * case an application must issue an explicit request. 200 */ 201 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 202 ieee80211_check_scan_current(vap); 203 break; 204 default: 205 goto invalid; 206 } 207 break; 208 case IEEE80211_S_RUN: 209 if (vap->iv_flags & IEEE80211_F_WPA) { 210 /* XXX validate prerequisites */ 211 } 212 switch (ostate) { 213 case IEEE80211_S_SCAN: 214#ifdef IEEE80211_DEBUG 215 if (ieee80211_msg_debug(vap)) { 216 ieee80211_note(vap, 217 "synchronized with %s ssid ", 218 ether_sprintf(ni->ni_bssid)); 219 ieee80211_print_essid(vap->iv_bss->ni_essid, 220 ni->ni_esslen); 221 /* XXX MCS/HT */ 222 printf(" channel %d start %uMb\n", 223 ieee80211_chan2ieee(ic, ic->ic_curchan), 224 IEEE80211_RATE2MBS(ni->ni_txrate)); 225 } 226#endif 227 break; 228 default: 229 goto invalid; 230 } 231 /* 232 * When 802.1x is not in use mark the port authorized 233 * at this point so traffic can flow. 234 */ 235 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 236 ieee80211_node_authorize(ni); 237 /* 238 * Fake association when joining an existing bss. 239 */ 240 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 241 ic->ic_newassoc != NULL) 242 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 243 break; 244 case IEEE80211_S_SLEEP: 245 ieee80211_sta_pwrsave(vap, 0); 246 break; 247 default: 248 invalid: 249 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 250 "%s: unexpected state transition %s -> %s\n", __func__, 251 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 252 break; 253 } 254 return 0; 255} 256 257/* 258 * Decide if a received management frame should be 259 * printed when debugging is enabled. This filters some 260 * of the less interesting frames that come frequently 261 * (e.g. beacons). 262 */ 263static __inline int 264doprint(struct ieee80211vap *vap, int subtype) 265{ 266 switch (subtype) { 267 case IEEE80211_FC0_SUBTYPE_BEACON: 268 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 269 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 270 return 1; 271 } 272 return 1; 273} 274 275/* 276 * Process a received frame. The node associated with the sender 277 * should be supplied. If nothing was found in the node table then 278 * the caller is assumed to supply a reference to iv_bss instead. 279 * The RSSI and a timestamp are also supplied. The RSSI data is used 280 * during AP scanning to select a AP to associate with; it can have 281 * any units so long as values have consistent units and higher values 282 * mean ``better signal''. The receive timestamp is currently not used 283 * by the 802.11 layer. 284 */ 285static int 286adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 287{ 288#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 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; 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 need_tap = 1; /* mbuf need to be tapped. */ 322 type = -1; /* undefined */ 323 324 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 325 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 326 ni->ni_macaddr, NULL, 327 "too short (1): len %u", m->m_pkthdr.len); 328 vap->iv_stats.is_rx_tooshort++; 329 goto out; 330 } 331 /* 332 * Bit of a cheat here, we use a pointer for a 3-address 333 * frame format but don't reference fields past outside 334 * ieee80211_frame_min w/o first validating the data is 335 * present. 336 */ 337 wh = mtod(m, struct ieee80211_frame *); 338 339 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 340 IEEE80211_FC0_VERSION_0) { 341 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 342 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 343 wh->i_fc[0], wh->i_fc[1]); 344 vap->iv_stats.is_rx_badversion++; 345 goto err; 346 } 347 348 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 349 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 350 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 351 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 352 if (dir != IEEE80211_FC1_DIR_NODS) 353 bssid = wh->i_addr1; 354 else if (type == IEEE80211_FC0_TYPE_CTL) 355 bssid = wh->i_addr1; 356 else { 357 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 358 IEEE80211_DISCARD_MAC(vap, 359 IEEE80211_MSG_ANY, ni->ni_macaddr, 360 NULL, "too short (2): len %u", 361 m->m_pkthdr.len); 362 vap->iv_stats.is_rx_tooshort++; 363 goto out; 364 } 365 bssid = wh->i_addr3; 366 } 367 /* 368 * Validate the bssid. 369 */ 370 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 371 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 372 /* not interested in */ 373 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 374 bssid, NULL, "%s", "not to bss"); 375 vap->iv_stats.is_rx_wrongbss++; 376 goto out; 377 } 378 /* 379 * Data frame, cons up a node when it doesn't 380 * exist. This should probably done after an ACL check. 381 */ 382 if (type == IEEE80211_FC0_TYPE_DATA && 383 ni == vap->iv_bss && 384 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 385 /* 386 * Beware of frames that come in too early; we 387 * can receive broadcast frames and creating sta 388 * entries will blow up because there is no bss 389 * channel yet. 390 */ 391 if (vap->iv_state != IEEE80211_S_RUN) { 392 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 393 wh, "data", "not in RUN state (%s)", 394 ieee80211_state_name[vap->iv_state]); 395 vap->iv_stats.is_rx_badstate++; 396 goto err; 397 } 398 /* 399 * Fake up a node for this newly 400 * discovered member of the IBSS. 401 */ 402 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 403 if (ni == NULL) { 404 /* NB: stat kept for alloc failure */ 405 goto err; 406 } 407 } 408 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 409 ni->ni_noise = nf; 410 if (HAS_SEQ(type)) { 411 uint8_t tid = ieee80211_gettid(wh); 412 if (IEEE80211_QOS_HAS_SEQ(wh) && 413 TID_TO_WME_AC(tid) >= WME_AC_VI) 414 ic->ic_wme.wme_hipri_traffic++; 415 rxseq = le16toh(*(uint16_t *)wh->i_seq); 416 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 417 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 418 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 419 /* duplicate, discard */ 420 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 421 bssid, "duplicate", 422 "seqno <%u,%u> fragno <%u,%u> tid %u", 423 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 424 ni->ni_rxseqs[tid] >> 425 IEEE80211_SEQ_SEQ_SHIFT, 426 rxseq & IEEE80211_SEQ_FRAG_MASK, 427 ni->ni_rxseqs[tid] & 428 IEEE80211_SEQ_FRAG_MASK, 429 tid); 430 vap->iv_stats.is_rx_dup++; 431 IEEE80211_NODE_STAT(ni, rx_dup); 432 goto out; 433 } 434 ni->ni_rxseqs[tid] = rxseq; 435 } 436 } 437 438 switch (type) { 439 case IEEE80211_FC0_TYPE_DATA: 440 hdrspace = ieee80211_hdrspace(ic, wh); 441 if (m->m_len < hdrspace && 442 (m = m_pullup(m, hdrspace)) == NULL) { 443 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 444 ni->ni_macaddr, NULL, 445 "data too short: expecting %u", hdrspace); 446 vap->iv_stats.is_rx_tooshort++; 447 goto out; /* XXX */ 448 } 449 if (dir != IEEE80211_FC1_DIR_NODS) { 450 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 451 wh, "data", "incorrect dir 0x%x", dir); 452 vap->iv_stats.is_rx_wrongdir++; 453 goto out; 454 } 455 /* XXX no power-save support */ 456 457 /* 458 * Handle A-MPDU re-ordering. If the frame is to be 459 * processed directly then ieee80211_ampdu_reorder 460 * will return 0; otherwise it has consumed the mbuf 461 * and we should do nothing more with it. 462 */ 463 if ((m->m_flags & M_AMPDU) && 464 ieee80211_ampdu_reorder(ni, m) != 0) { 465 m = NULL; 466 goto out; 467 } 468 resubmit_ampdu: 469 470 /* 471 * Handle privacy requirements. Note that we 472 * must not be preempted from here until after 473 * we (potentially) call ieee80211_crypto_demic; 474 * otherwise we may violate assumptions in the 475 * crypto cipher modules used to do delayed update 476 * of replay sequence numbers. 477 */ 478 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 479 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 480 /* 481 * Discard encrypted frames when privacy is off. 482 */ 483 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 484 wh, "WEP", "%s", "PRIVACY off"); 485 vap->iv_stats.is_rx_noprivacy++; 486 IEEE80211_NODE_STAT(ni, rx_noprivacy); 487 goto out; 488 } 489 key = ieee80211_crypto_decap(ni, m, hdrspace); 490 if (key == NULL) { 491 /* NB: stats+msgs handled in crypto_decap */ 492 IEEE80211_NODE_STAT(ni, rx_wepfail); 493 goto out; 494 } 495 wh = mtod(m, struct ieee80211_frame *); 496 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 497 } else { 498 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 499 key = NULL; 500 } 501 502 /* 503 * Save QoS bits for use below--before we strip the header. 504 */ 505 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 506 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 507 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 508 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 509 } else 510 qos = 0; 511 512 /* 513 * Next up, any fragmentation. 514 */ 515 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 516 m = ieee80211_defrag(ni, m, hdrspace); 517 if (m == NULL) { 518 /* Fragment dropped or frame not complete yet */ 519 goto out; 520 } 521 } 522 wh = NULL; /* no longer valid, catch any uses */ 523 524 /* 525 * Next strip any MSDU crypto bits. 526 */ 527 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 528 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 529 ni->ni_macaddr, "data", "%s", "demic error"); 530 vap->iv_stats.is_rx_demicfail++; 531 IEEE80211_NODE_STAT(ni, rx_demicfail); 532 goto out; 533 } 534 535 /* copy to listener after decrypt */ 536 if (ieee80211_radiotap_active_vap(vap)) 537 ieee80211_radiotap_rx(vap, m); 538 need_tap = 0; 539 540 /* 541 * Finally, strip the 802.11 header. 542 */ 543 m = ieee80211_decap(vap, m, hdrspace); 544 if (m == NULL) { 545 /* XXX mask bit to check for both */ 546 /* don't count Null data frames as errors */ 547 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 548 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 549 goto out; 550 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 551 ni->ni_macaddr, "data", "%s", "decap error"); 552 vap->iv_stats.is_rx_decap++; 553 IEEE80211_NODE_STAT(ni, rx_decap); 554 goto err; 555 } 556 eh = mtod(m, struct ether_header *); 557 if (!ieee80211_node_is_authorized(ni)) { 558 /* 559 * Deny any non-PAE frames received prior to 560 * authorization. For open/shared-key 561 * authentication the port is mark authorized 562 * after authentication completes. For 802.1x 563 * the port is not marked authorized by the 564 * authenticator until the handshake has completed. 565 */ 566 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 567 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 568 eh->ether_shost, "data", 569 "unauthorized port: ether type 0x%x len %u", 570 eh->ether_type, m->m_pkthdr.len); 571 vap->iv_stats.is_rx_unauth++; 572 IEEE80211_NODE_STAT(ni, rx_unauth); 573 goto err; 574 } 575 } else { 576 /* 577 * When denying unencrypted frames, discard 578 * any non-PAE frames received without encryption. 579 */ 580 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 581 (key == NULL && (m->m_flags & M_WEP) == 0) && 582 eh->ether_type != htons(ETHERTYPE_PAE)) { 583 /* 584 * Drop unencrypted frames. 585 */ 586 vap->iv_stats.is_rx_unencrypted++; 587 IEEE80211_NODE_STAT(ni, rx_unencrypted); 588 goto out; 589 } 590 } 591 /* XXX require HT? */ 592 if (qos & IEEE80211_QOS_AMSDU) { 593 m = ieee80211_decap_amsdu(ni, m); 594 if (m == NULL) 595 return IEEE80211_FC0_TYPE_DATA; 596 } else { 597#ifdef IEEE80211_SUPPORT_SUPERG 598 m = ieee80211_decap_fastframe(vap, ni, m); 599 if (m == NULL) 600 return IEEE80211_FC0_TYPE_DATA; 601#endif 602 } 603 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 604 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 605 else 606 ieee80211_deliver_data(vap, ni, m); 607 return IEEE80211_FC0_TYPE_DATA; 608 609 case IEEE80211_FC0_TYPE_MGT: 610 vap->iv_stats.is_rx_mgmt++; 611 IEEE80211_NODE_STAT(ni, rx_mgmt); 612 if (dir != IEEE80211_FC1_DIR_NODS) { 613 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 614 wh, "data", "incorrect dir 0x%x", dir); 615 vap->iv_stats.is_rx_wrongdir++; 616 goto err; 617 } 618 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 619 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 620 ni->ni_macaddr, "mgt", "too short: len %u", 621 m->m_pkthdr.len); 622 vap->iv_stats.is_rx_tooshort++; 623 goto out; 624 } 625#ifdef IEEE80211_DEBUG 626 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 627 ieee80211_msg_dumppkts(vap)) { 628 if_printf(ifp, "received %s from %s rssi %d\n", 629 ieee80211_mgt_subtype_name[subtype >> 630 IEEE80211_FC0_SUBTYPE_SHIFT], 631 ether_sprintf(wh->i_addr2), rssi); 632 } 633#endif 634 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 635 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 636 wh, NULL, "%s", "WEP set but not permitted"); 637 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 638 goto out; 639 } 640 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 641 goto out; 642 643 case IEEE80211_FC0_TYPE_CTL: 644 vap->iv_stats.is_rx_ctl++; 645 IEEE80211_NODE_STAT(ni, rx_ctrl); 646 vap->iv_recv_ctl(ni, m, subtype); 647 goto out; 648 649 default: 650 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 651 wh, "bad", "frame type 0x%x", type); 652 /* should not come here */ 653 break; 654 } 655err: 656 ifp->if_ierrors++; 657out: 658 if (m != NULL) { 659 if (need_tap) 660 ieee80211_radiotap_rx(vap, m); 661 m_freem(m); 662 } 663 return type; 664#undef SEQ_LEQ 665} 666 667static int 668is11bclient(const uint8_t *rates, const uint8_t *xrates) 669{ 670 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 671 int i; 672 673 /* NB: the 11b clients we care about will not have xrates */ 674 if (xrates != NULL || rates == NULL) 675 return 0; 676 for (i = 0; i < rates[1]; i++) { 677 int r = rates[2+i] & IEEE80211_RATE_VAL; 678 if (r > 2*11 || ((1<<r) & brates) == 0) 679 return 0; 680 } 681 return 1; 682} 683 684static void 685adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 686 int subtype, int rssi, int nf) 687{ 688 struct ieee80211vap *vap = ni->ni_vap; 689 struct ieee80211com *ic = ni->ni_ic; 690 struct ieee80211_frame *wh; 691 uint8_t *frm, *efrm, *sfrm; 692 uint8_t *ssid, *rates, *xrates; 693 694 wh = mtod(m0, struct ieee80211_frame *); 695 frm = (uint8_t *)&wh[1]; 696 efrm = mtod(m0, uint8_t *) + m0->m_len; 697 switch (subtype) { 698 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 699 case IEEE80211_FC0_SUBTYPE_BEACON: { 700 struct ieee80211_scanparams scan; 701 /* 702 * We process beacon/probe response 703 * frames to discover neighbors. 704 */ 705 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 706 return; 707 /* 708 * Count frame now that we know it's to be processed. 709 */ 710 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 711 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 712 IEEE80211_NODE_STAT(ni, rx_beacons); 713 } else 714 IEEE80211_NODE_STAT(ni, rx_proberesp); 715 /* 716 * If scanning, just pass information to the scan module. 717 */ 718 if (ic->ic_flags & IEEE80211_F_SCAN) { 719 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 720 /* 721 * Actively scanning a channel marked passive; 722 * send a probe request now that we know there 723 * is 802.11 traffic present. 724 * 725 * XXX check if the beacon we recv'd gives 726 * us what we need and suppress the probe req 727 */ 728 ieee80211_probe_curchan(vap, 1); 729 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 730 } 731 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 732 return; 733 } 734 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 735 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 736 /* 737 * Create a new entry in the neighbor table. 738 */ 739 ni = ieee80211_add_neighbor(vap, wh, &scan); 740 } else if (ni->ni_capinfo == 0) { 741 /* 742 * Update faked node created on transmit. 743 * Note this also updates the tsf. 744 */ 745 ieee80211_init_neighbor(ni, wh, &scan); 746 } else { 747 /* 748 * Record tsf for potential resync. 749 */ 750 memcpy(ni->ni_tstamp.data, scan.tstamp, 751 sizeof(ni->ni_tstamp)); 752 } 753 if (ni != NULL) { 754 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 755 ni->ni_noise = nf; 756 } 757 } 758 break; 759 } 760 761 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 762 if (vap->iv_state != IEEE80211_S_RUN) { 763 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 764 wh, NULL, "wrong state %s", 765 ieee80211_state_name[vap->iv_state]); 766 vap->iv_stats.is_rx_mgtdiscard++; 767 return; 768 } 769 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 770 /* frame must be directed */ 771 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 772 wh, NULL, "%s", "not unicast"); 773 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 774 return; 775 } 776 777 /* 778 * prreq frame format 779 * [tlv] ssid 780 * [tlv] supported rates 781 * [tlv] extended supported rates 782 */ 783 ssid = rates = xrates = NULL; 784 sfrm = frm; 785 while (efrm - frm > 1) { 786 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 787 switch (*frm) { 788 case IEEE80211_ELEMID_SSID: 789 ssid = frm; 790 break; 791 case IEEE80211_ELEMID_RATES: 792 rates = frm; 793 break; 794 case IEEE80211_ELEMID_XRATES: 795 xrates = frm; 796 break; 797 } 798 frm += frm[1] + 2; 799 } 800 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 801 if (xrates != NULL) 802 IEEE80211_VERIFY_ELEMENT(xrates, 803 IEEE80211_RATE_MAXSIZE - rates[1], return); 804 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 805 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 806 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 807 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 808 wh, NULL, 809 "%s", "no ssid with ssid suppression enabled"); 810 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 811 return; 812 } 813 814 /* XXX find a better class or define it's own */ 815 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 816 "%s", "recv probe req"); 817 /* 818 * Some legacy 11b clients cannot hack a complete 819 * probe response frame. When the request includes 820 * only a bare-bones rate set, communicate this to 821 * the transmit side. 822 */ 823 ieee80211_send_proberesp(vap, wh->i_addr2, 824 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 825 break; 826 827 case IEEE80211_FC0_SUBTYPE_ACTION: { 828 const struct ieee80211_action *ia; 829 830 if (vap->iv_state != IEEE80211_S_RUN) { 831 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 832 wh, NULL, "wrong state %s", 833 ieee80211_state_name[vap->iv_state]); 834 vap->iv_stats.is_rx_mgtdiscard++; 835 return; 836 } 837 /* 838 * action frame format: 839 * [1] category 840 * [1] action 841 * [tlv] parameters 842 */ 843 IEEE80211_VERIFY_LENGTH(efrm - frm, 844 sizeof(struct ieee80211_action), return); 845 ia = (const struct ieee80211_action *) frm; 846 847 vap->iv_stats.is_rx_action++; 848 IEEE80211_NODE_STAT(ni, rx_action); 849 850 /* verify frame payloads but defer processing */ 851 /* XXX maybe push this to method */ 852 switch (ia->ia_category) { 853 case IEEE80211_ACTION_CAT_BA: 854 switch (ia->ia_action) { 855 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 856 IEEE80211_VERIFY_LENGTH(efrm - frm, 857 sizeof(struct ieee80211_action_ba_addbarequest), 858 return); 859 break; 860 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 861 IEEE80211_VERIFY_LENGTH(efrm - frm, 862 sizeof(struct ieee80211_action_ba_addbaresponse), 863 return); 864 break; 865 case IEEE80211_ACTION_BA_DELBA: 866 IEEE80211_VERIFY_LENGTH(efrm - frm, 867 sizeof(struct ieee80211_action_ba_delba), 868 return); 869 break; 870 } 871 break; 872 case IEEE80211_ACTION_CAT_HT: 873 switch (ia->ia_action) { 874 case IEEE80211_ACTION_HT_TXCHWIDTH: 875 IEEE80211_VERIFY_LENGTH(efrm - frm, 876 sizeof(struct ieee80211_action_ht_txchwidth), 877 return); 878 break; 879 } 880 break; 881 } 882 ic->ic_recv_action(ni, frm, efrm); 883 break; 884 } 885 886 case IEEE80211_FC0_SUBTYPE_AUTH: 887 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 888 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 889 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 890 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 891 case IEEE80211_FC0_SUBTYPE_DEAUTH: 892 case IEEE80211_FC0_SUBTYPE_DISASSOC: 893 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 894 wh, NULL, "%s", "not handled"); 895 vap->iv_stats.is_rx_mgtdiscard++; 896 return; 897 898 default: 899 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 900 wh, "mgt", "subtype 0x%x not handled", subtype); 901 vap->iv_stats.is_rx_badsubtype++; 902 break; 903 } 904} 905#undef IEEE80211_VERIFY_LENGTH 906#undef IEEE80211_VERIFY_ELEMENT 907 908static void 909ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 910 int subtype, int rssi, int nf) 911{ 912 struct ieee80211vap *vap = ni->ni_vap; 913 struct ieee80211com *ic = ni->ni_ic; 914 915 /* 916 * Process management frames when scanning; useful for doing 917 * a site-survey. 918 */ 919 if (ic->ic_flags & IEEE80211_F_SCAN) 920 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf); 921 else 922 vap->iv_stats.is_rx_mgtdiscard++; 923} 924 925static void 926adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) 927{ 928} 929