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 * $FreeBSD: head/sys/net80211/ieee80211_adhoc.c 203422 2010-02-03 10:07:43Z rpaulo $ 26 * $DragonFly$ 27 */ 28 29 /* 30 * IEEE 802.11 IBSS mode support. 31 */ 32 #include "opt_inet.h" 33 #include "opt_wlan.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/mbuf.h> 38 #include <sys/malloc.h> 39 #include <sys/kernel.h> 40 41 #include <sys/socket.h> 42 #include <sys/sockio.h> 43 #include <sys/endian.h> 44 #include <sys/errno.h> 45 #include <sys/proc.h> 46 #include <sys/sysctl.h> 47 48 #include <net/if.h> 49 #include <net/if_media.h> 50 #include <net/if_llc.h> 51 #include <net/ethernet.h> 52 #include <net/route.h> 53 54 #include <net/bpf.h> 55 56 #include <netproto/802_11/ieee80211_var.h> 57 #include <netproto/802_11/ieee80211_adhoc.h> 58 #include <netproto/802_11/ieee80211_input.h> 59 #ifdef IEEE80211_SUPPORT_SUPERG 60 #include <netproto/802_11/ieee80211_superg.h> 61 #endif 62 #ifdef IEEE80211_SUPPORT_TDMA 63 #include <netproto/802_11/ieee80211_tdma.h> 64 #endif 65 66 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 67 68 static void adhoc_vattach(struct ieee80211vap *); 69 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); 70 static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int); 71 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 72 int subtype, int, int); 73 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 74 int subtype, int, int); 75 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 76 77 void 78 ieee80211_adhoc_attach(struct ieee80211com *ic) 79 { 80 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach; 81 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach; 82 } 83 84 void 85 ieee80211_adhoc_detach(struct ieee80211com *ic) 86 { 87 } 88 89 static void 90 adhoc_vdetach(struct ieee80211vap *vap) 91 { 92 } 93 94 static void 95 adhoc_vattach(struct ieee80211vap *vap) 96 { 97 vap->iv_newstate = adhoc_newstate; 98 vap->iv_input = adhoc_input; 99 if (vap->iv_opmode == IEEE80211_M_IBSS) 100 vap->iv_recv_mgmt = adhoc_recv_mgmt; 101 else 102 vap->iv_recv_mgmt = ahdemo_recv_mgmt; 103 vap->iv_recv_ctl = adhoc_recv_ctl; 104 vap->iv_opdetach = adhoc_vdetach; 105 #ifdef IEEE80211_SUPPORT_TDMA 106 /* 107 * Throw control to tdma support. Note we do this 108 * after setting up our callbacks so it can piggyback 109 * on top of us. 110 */ 111 if (vap->iv_caps & IEEE80211_C_TDMA) 112 ieee80211_tdma_vattach(vap); 113 #endif 114 } 115 116 static void 117 sta_leave(void *arg, struct ieee80211_node *ni) 118 { 119 struct ieee80211vap *vap = arg; 120 121 if (ni->ni_vap == vap && ni != vap->iv_bss) 122 ieee80211_node_leave(ni); 123 } 124 125 /* 126 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler. 127 */ 128 static int 129 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 130 { 131 struct ieee80211com *ic = vap->iv_ic; 132 struct ieee80211_node *ni; 133 enum ieee80211_state ostate; 134 135 ostate = vap->iv_state; 136 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 137 __func__, ieee80211_state_name[ostate], 138 ieee80211_state_name[nstate], arg); 139 vap->iv_state = nstate; /* state transition */ 140 if (ostate != IEEE80211_S_SCAN) 141 ieee80211_cancel_scan(vap); /* background scan */ 142 ni = vap->iv_bss; /* NB: no reference held */ 143 switch (nstate) { 144 case IEEE80211_S_INIT: 145 switch (ostate) { 146 case IEEE80211_S_SCAN: 147 ieee80211_cancel_scan(vap); 148 break; 149 default: 150 break; 151 } 152 if (ostate != IEEE80211_S_INIT) { 153 /* NB: optimize INIT -> INIT case */ 154 ieee80211_reset_bss(vap); 155 } 156 break; 157 case IEEE80211_S_SCAN: 158 switch (ostate) { 159 case IEEE80211_S_RUN: /* beacon miss */ 160 /* purge station table; entries are stale */ 161 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap); 162 /* fall thru... */ 163 case IEEE80211_S_INIT: 164 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 165 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 166 /* 167 * Already have a channel; bypass the 168 * scan and startup immediately. 169 */ 170 ieee80211_create_ibss(vap, vap->iv_des_chan); 171 break; 172 } 173 /* 174 * Initiate a scan. We can come here as a result 175 * of an IEEE80211_IOC_SCAN_REQ too in which case 176 * the vap will be marked with IEEE80211_FEXT_SCANREQ 177 * and the scan request parameters will be present 178 * in iv_scanreq. Otherwise we do the default. 179 */ 180 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 181 ieee80211_check_scan(vap, 182 vap->iv_scanreq_flags, 183 vap->iv_scanreq_duration, 184 vap->iv_scanreq_mindwell, 185 vap->iv_scanreq_maxdwell, 186 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 187 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 188 } else 189 ieee80211_check_scan_current(vap); 190 break; 191 case IEEE80211_S_SCAN: 192 /* 193 * This can happen because of a change in state 194 * that requires a reset. Trigger a new scan 195 * unless we're in manual roaming mode in which 196 * case an application must issue an explicit request. 197 */ 198 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 199 ieee80211_check_scan_current(vap); 200 break; 201 default: 202 goto invalid; 203 } 204 break; 205 case IEEE80211_S_RUN: 206 if (vap->iv_flags & IEEE80211_F_WPA) { 207 /* XXX validate prerequisites */ 208 } 209 switch (ostate) { 210 case IEEE80211_S_SCAN: 211 #ifdef IEEE80211_DEBUG 212 if (ieee80211_msg_debug(vap)) { 213 ieee80211_note(vap, 214 "synchronized with %6D ssid ", 215 ni->ni_bssid, ":"); 216 ieee80211_print_essid(vap->iv_bss->ni_essid, 217 ni->ni_esslen); 218 /* XXX MCS/HT */ 219 kprintf(" channel %d start %uMb\n", 220 ieee80211_chan2ieee(ic, ic->ic_curchan), 221 IEEE80211_RATE2MBS(ni->ni_txrate)); 222 } 223 #endif 224 break; 225 default: 226 goto invalid; 227 } 228 /* 229 * When 802.1x is not in use mark the port authorized 230 * at this point so traffic can flow. 231 */ 232 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 233 ieee80211_node_authorize(ni); 234 /* 235 * Fake association when joining an existing bss. 236 */ 237 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 238 ic->ic_newassoc != NULL) 239 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 240 break; 241 case IEEE80211_S_SLEEP: 242 ieee80211_sta_pwrsave(vap, 0); 243 break; 244 default: 245 invalid: 246 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 247 "%s: unexpected state transition %s -> %s\n", __func__, 248 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 249 break; 250 } 251 return 0; 252 } 253 254 /* 255 * Decide if a received management frame should be 256 * printed when debugging is enabled. This filters some 257 * of the less interesting frames that come frequently 258 * (e.g. beacons). 259 */ 260 static __inline int 261 doprint(struct ieee80211vap *vap, int subtype) 262 { 263 switch (subtype) { 264 case IEEE80211_FC0_SUBTYPE_BEACON: 265 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 266 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 267 return 1; 268 } 269 return 1; 270 } 271 272 /* 273 * Process a received frame. The node associated with the sender 274 * should be supplied. If nothing was found in the node table then 275 * the caller is assumed to supply a reference to iv_bss instead. 276 * The RSSI and a timestamp are also supplied. The RSSI data is used 277 * during AP scanning to select a AP to associate with; it can have 278 * any units so long as values have consistent units and higher values 279 * mean ``better signal''. The receive timestamp is currently not used 280 * by the 802.11 layer. 281 */ 282 static int 283 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 284 { 285 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 286 #define HAS_SEQ(type) ((type & 0x4) == 0) 287 struct ieee80211vap *vap = ni->ni_vap; 288 struct ieee80211com *ic = ni->ni_ic; 289 struct ifnet *ifp = vap->iv_ifp; 290 struct ieee80211_frame *wh; 291 struct ieee80211_key *key; 292 struct ether_header *eh; 293 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 294 uint8_t dir, type, subtype, qos; 295 uint8_t *bssid; 296 uint16_t rxseq; 297 298 if (m->m_flags & M_AMPDU_MPDU) { 299 /* 300 * Fastpath for A-MPDU reorder q resubmission. Frames 301 * w/ M_AMPDU_MPDU marked have already passed through 302 * here but were received out of order and been held on 303 * the reorder queue. When resubmitted they are marked 304 * with the M_AMPDU_MPDU flag and we can bypass most of 305 * the normal processing. 306 */ 307 wh = mtod(m, struct ieee80211_frame *); 308 type = IEEE80211_FC0_TYPE_DATA; 309 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 310 subtype = IEEE80211_FC0_SUBTYPE_QOS; 311 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 312 goto resubmit_ampdu; 313 } 314 315 KASSERT(ni != NULL, ("null node")); 316 ni->ni_inact = ni->ni_inact_reload; 317 318 type = -1; /* undefined */ 319 320 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 321 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 322 ni->ni_macaddr, NULL, 323 "too short (1): len %u", m->m_pkthdr.len); 324 vap->iv_stats.is_rx_tooshort++; 325 goto out; 326 } 327 /* 328 * Bit of a cheat here, we use a pointer for a 3-address 329 * frame format but don't reference fields past outside 330 * ieee80211_frame_min w/o first validating the data is 331 * present. 332 */ 333 wh = mtod(m, struct ieee80211_frame *); 334 335 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 336 IEEE80211_FC0_VERSION_0) { 337 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 338 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 339 wh->i_fc[0], wh->i_fc[1]); 340 vap->iv_stats.is_rx_badversion++; 341 goto err; 342 } 343 344 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 345 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 346 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 347 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 348 if (dir != IEEE80211_FC1_DIR_NODS) 349 bssid = wh->i_addr1; 350 else if (type == IEEE80211_FC0_TYPE_CTL) 351 bssid = wh->i_addr1; 352 else { 353 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 354 IEEE80211_DISCARD_MAC(vap, 355 IEEE80211_MSG_ANY, ni->ni_macaddr, 356 NULL, "too short (2): len %u", 357 m->m_pkthdr.len); 358 vap->iv_stats.is_rx_tooshort++; 359 goto out; 360 } 361 bssid = wh->i_addr3; 362 } 363 /* 364 * Validate the bssid. 365 */ 366 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 367 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 368 /* not interested in */ 369 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 370 bssid, NULL, "%s", "not to bss"); 371 vap->iv_stats.is_rx_wrongbss++; 372 goto out; 373 } 374 /* 375 * Data frame, cons up a node when it doesn't 376 * exist. This should probably done after an ACL check. 377 */ 378 if (type == IEEE80211_FC0_TYPE_DATA && 379 ni == vap->iv_bss && 380 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 381 /* 382 * Beware of frames that come in too early; we 383 * can receive broadcast frames and creating sta 384 * entries will blow up because there is no bss 385 * channel yet. 386 */ 387 if (vap->iv_state != IEEE80211_S_RUN) { 388 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 389 wh, "data", "not in RUN state (%s)", 390 ieee80211_state_name[vap->iv_state]); 391 vap->iv_stats.is_rx_badstate++; 392 goto err; 393 } 394 /* 395 * Fake up a node for this newly 396 * discovered member of the IBSS. 397 */ 398 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 399 if (ni == NULL) { 400 /* NB: stat kept for alloc failure */ 401 goto err; 402 } 403 } 404 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 405 ni->ni_noise = nf; 406 if (HAS_SEQ(type)) { 407 uint8_t tid = ieee80211_gettid(wh); 408 if (IEEE80211_QOS_HAS_SEQ(wh) && 409 TID_TO_WME_AC(tid) >= WME_AC_VI) 410 ic->ic_wme.wme_hipri_traffic++; 411 rxseq = le16toh(*(uint16_t *)wh->i_seq); 412 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 413 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 414 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 415 /* duplicate, discard */ 416 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 417 bssid, "duplicate", 418 "seqno <%u,%u> fragno <%u,%u> tid %u", 419 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 420 ni->ni_rxseqs[tid] >> 421 IEEE80211_SEQ_SEQ_SHIFT, 422 rxseq & IEEE80211_SEQ_FRAG_MASK, 423 ni->ni_rxseqs[tid] & 424 IEEE80211_SEQ_FRAG_MASK, 425 tid); 426 vap->iv_stats.is_rx_dup++; 427 IEEE80211_NODE_STAT(ni, rx_dup); 428 goto out; 429 } 430 ni->ni_rxseqs[tid] = rxseq; 431 } 432 } 433 434 switch (type) { 435 case IEEE80211_FC0_TYPE_DATA: 436 hdrspace = ieee80211_hdrspace(ic, wh); 437 if (m->m_len < hdrspace && 438 (m = m_pullup(m, hdrspace)) == NULL) { 439 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 440 ni->ni_macaddr, NULL, 441 "data too short: expecting %u", hdrspace); 442 vap->iv_stats.is_rx_tooshort++; 443 goto out; /* XXX */ 444 } 445 if (dir != IEEE80211_FC1_DIR_NODS) { 446 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 447 wh, "data", "incorrect dir 0x%x", dir); 448 vap->iv_stats.is_rx_wrongdir++; 449 goto out; 450 } 451 /* XXX no power-save support */ 452 453 /* 454 * Handle A-MPDU re-ordering. If the frame is to be 455 * processed directly then ieee80211_ampdu_reorder 456 * will return 0; otherwise it has consumed the mbuf 457 * and we should do nothing more with it. 458 */ 459 if ((m->m_flags & M_AMPDU) && 460 ieee80211_ampdu_reorder(ni, m) != 0) { 461 m = NULL; 462 goto out; 463 } 464 resubmit_ampdu: 465 466 /* 467 * Handle privacy requirements. Note that we 468 * must not be preempted from here until after 469 * we (potentially) call ieee80211_crypto_demic; 470 * otherwise we may violate assumptions in the 471 * crypto cipher modules used to do delayed update 472 * of replay sequence numbers. 473 */ 474 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 475 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 476 /* 477 * Discard encrypted frames when privacy is off. 478 */ 479 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 480 wh, "WEP", "%s", "PRIVACY off"); 481 vap->iv_stats.is_rx_noprivacy++; 482 IEEE80211_NODE_STAT(ni, rx_noprivacy); 483 goto out; 484 } 485 key = ieee80211_crypto_decap(ni, m, hdrspace); 486 if (key == NULL) { 487 /* NB: stats+msgs handled in crypto_decap */ 488 IEEE80211_NODE_STAT(ni, rx_wepfail); 489 goto out; 490 } 491 wh = mtod(m, struct ieee80211_frame *); 492 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 493 } else { 494 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 495 key = NULL; 496 } 497 498 /* 499 * Save QoS bits for use below--before we strip the header. 500 */ 501 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 502 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 503 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 504 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 505 } else 506 qos = 0; 507 508 /* 509 * Next up, any fragmentation. 510 */ 511 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 512 m = ieee80211_defrag(ni, m, hdrspace); 513 if (m == NULL) { 514 /* Fragment dropped or frame not complete yet */ 515 goto out; 516 } 517 } 518 wh = NULL; /* no longer valid, catch any uses */ 519 520 /* 521 * Next strip any MSDU crypto bits. 522 */ 523 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 524 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 525 ni->ni_macaddr, "data", "%s", "demic error"); 526 vap->iv_stats.is_rx_demicfail++; 527 IEEE80211_NODE_STAT(ni, rx_demicfail); 528 goto out; 529 } 530 531 /* copy to listener after decrypt */ 532 if (ieee80211_radiotap_active_vap(vap)) 533 ieee80211_radiotap_rx(vap, m); 534 need_tap = 0; 535 536 /* 537 * Finally, strip the 802.11 header. 538 */ 539 m = ieee80211_decap(vap, m, hdrspace); 540 if (m == NULL) { 541 /* XXX mask bit to check for both */ 542 /* don't count Null data frames as errors */ 543 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 544 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 545 goto out; 546 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 547 ni->ni_macaddr, "data", "%s", "decap error"); 548 vap->iv_stats.is_rx_decap++; 549 IEEE80211_NODE_STAT(ni, rx_decap); 550 goto err; 551 } 552 eh = mtod(m, struct ether_header *); 553 if (!ieee80211_node_is_authorized(ni)) { 554 /* 555 * Deny any non-PAE frames received prior to 556 * authorization. For open/shared-key 557 * authentication the port is mark authorized 558 * after authentication completes. For 802.1x 559 * the port is not marked authorized by the 560 * authenticator until the handshake has completed. 561 */ 562 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 563 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 564 eh->ether_shost, "data", 565 "unauthorized port: ether type 0x%x len %u", 566 eh->ether_type, m->m_pkthdr.len); 567 vap->iv_stats.is_rx_unauth++; 568 IEEE80211_NODE_STAT(ni, rx_unauth); 569 goto err; 570 } 571 } else { 572 /* 573 * When denying unencrypted frames, discard 574 * any non-PAE frames received without encryption. 575 */ 576 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 577 (key == NULL && (m->m_flags & M_WEP) == 0) && 578 eh->ether_type != htons(ETHERTYPE_PAE)) { 579 /* 580 * Drop unencrypted frames. 581 */ 582 vap->iv_stats.is_rx_unencrypted++; 583 IEEE80211_NODE_STAT(ni, rx_unencrypted); 584 goto out; 585 } 586 } 587 /* XXX require HT? */ 588 if (qos & IEEE80211_QOS_AMSDU) { 589 m = ieee80211_decap_amsdu(ni, m); 590 if (m == NULL) 591 return IEEE80211_FC0_TYPE_DATA; 592 } else { 593 #ifdef IEEE80211_SUPPORT_SUPERG 594 m = ieee80211_decap_fastframe(vap, ni, m); 595 if (m == NULL) 596 return IEEE80211_FC0_TYPE_DATA; 597 #endif 598 } 599 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 600 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 601 else 602 ieee80211_deliver_data(vap, ni, m); 603 return IEEE80211_FC0_TYPE_DATA; 604 605 case IEEE80211_FC0_TYPE_MGT: 606 vap->iv_stats.is_rx_mgmt++; 607 IEEE80211_NODE_STAT(ni, rx_mgmt); 608 if (dir != IEEE80211_FC1_DIR_NODS) { 609 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 610 wh, "data", "incorrect dir 0x%x", dir); 611 vap->iv_stats.is_rx_wrongdir++; 612 goto err; 613 } 614 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 615 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 616 ni->ni_macaddr, "mgt", "too short: len %u", 617 m->m_pkthdr.len); 618 vap->iv_stats.is_rx_tooshort++; 619 goto out; 620 } 621 #ifdef IEEE80211_DEBUG 622 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 623 ieee80211_msg_dumppkts(vap)) { 624 if_printf(ifp, "received %s from %6D rssi %d\n", 625 ieee80211_mgt_subtype_name[subtype >> 626 IEEE80211_FC0_SUBTYPE_SHIFT], 627 wh->i_addr2, ":", rssi); 628 } 629 #endif 630 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 631 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 632 wh, NULL, "%s", "WEP set but not permitted"); 633 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 634 goto out; 635 } 636 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 637 goto out; 638 639 case IEEE80211_FC0_TYPE_CTL: 640 vap->iv_stats.is_rx_ctl++; 641 IEEE80211_NODE_STAT(ni, rx_ctrl); 642 vap->iv_recv_ctl(ni, m, subtype); 643 goto out; 644 645 default: 646 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 647 wh, "bad", "frame type 0x%x", type); 648 /* should not come here */ 649 break; 650 } 651 err: 652 ifp->if_ierrors++; 653 out: 654 if (m != NULL) { 655 if (need_tap && ieee80211_radiotap_active_vap(vap)) 656 ieee80211_radiotap_rx(vap, m); 657 m_freem(m); 658 } 659 return type; 660 #undef SEQ_LEQ 661 } 662 663 static int 664 is11bclient(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 } 679 680 static void 681 adhoc_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 const struct ieee80211_action *ia; 825 826 if (vap->iv_state != IEEE80211_S_RUN) { 827 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 828 wh, NULL, "wrong state %s", 829 ieee80211_state_name[vap->iv_state]); 830 vap->iv_stats.is_rx_mgtdiscard++; 831 return; 832 } 833 /* 834 * action frame format: 835 * [1] category 836 * [1] action 837 * [tlv] parameters 838 */ 839 IEEE80211_VERIFY_LENGTH(efrm - frm, 840 sizeof(struct ieee80211_action), return); 841 ia = (const struct ieee80211_action *) frm; 842 843 vap->iv_stats.is_rx_action++; 844 IEEE80211_NODE_STAT(ni, rx_action); 845 846 /* verify frame payloads but defer processing */ 847 /* XXX maybe push this to method */ 848 switch (ia->ia_category) { 849 case IEEE80211_ACTION_CAT_BA: 850 switch (ia->ia_action) { 851 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 852 IEEE80211_VERIFY_LENGTH(efrm - frm, 853 sizeof(struct ieee80211_action_ba_addbarequest), 854 return); 855 break; 856 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 857 IEEE80211_VERIFY_LENGTH(efrm - frm, 858 sizeof(struct ieee80211_action_ba_addbaresponse), 859 return); 860 break; 861 case IEEE80211_ACTION_BA_DELBA: 862 IEEE80211_VERIFY_LENGTH(efrm - frm, 863 sizeof(struct ieee80211_action_ba_delba), 864 return); 865 break; 866 } 867 break; 868 case IEEE80211_ACTION_CAT_HT: 869 switch (ia->ia_action) { 870 case IEEE80211_ACTION_HT_TXCHWIDTH: 871 IEEE80211_VERIFY_LENGTH(efrm - frm, 872 sizeof(struct ieee80211_action_ht_txchwidth), 873 return); 874 break; 875 } 876 break; 877 } 878 ic->ic_recv_action(ni, wh, frm, efrm); 879 break; 880 } 881 882 case IEEE80211_FC0_SUBTYPE_AUTH: 883 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 884 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 885 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 886 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 887 case IEEE80211_FC0_SUBTYPE_DEAUTH: 888 case IEEE80211_FC0_SUBTYPE_DISASSOC: 889 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 890 wh, NULL, "%s", "not handled"); 891 vap->iv_stats.is_rx_mgtdiscard++; 892 return; 893 894 default: 895 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 896 wh, "mgt", "subtype 0x%x not handled", subtype); 897 vap->iv_stats.is_rx_badsubtype++; 898 break; 899 } 900 } 901 #undef IEEE80211_VERIFY_LENGTH 902 #undef IEEE80211_VERIFY_ELEMENT 903 904 static void 905 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 906 int subtype, int rssi, int nf) 907 { 908 struct ieee80211vap *vap = ni->ni_vap; 909 struct ieee80211com *ic = ni->ni_ic; 910 911 /* 912 * Process management frames when scanning; useful for doing 913 * a site-survey. 914 */ 915 if (ic->ic_flags & IEEE80211_F_SCAN) 916 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf); 917 else 918 vap->iv_stats.is_rx_mgtdiscard++; 919 } 920 921 static void 922 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) 923 { 924 } 925