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 */ 27 28 /* 29 * IEEE 802.11 IBSS mode support. 30 */ 31 #include "opt_inet.h" 32 #include "opt_wlan.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/mbuf.h> 37 #include <sys/malloc.h> 38 #include <sys/kernel.h> 39 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/endian.h> 43 #include <sys/errno.h> 44 #include <sys/proc.h> 45 #include <sys/sysctl.h> 46 47 #include <net/if.h> 48 #include <net/if_media.h> 49 #include <net/if_llc.h> 50 #include <net/ethernet.h> 51 #include <net/route.h> 52 53 #include <net/bpf.h> 54 55 #include <netproto/802_11/ieee80211_var.h> 56 #include <netproto/802_11/ieee80211_adhoc.h> 57 #include <netproto/802_11/ieee80211_input.h> 58 #ifdef IEEE80211_SUPPORT_SUPERG 59 #include <netproto/802_11/ieee80211_superg.h> 60 #endif 61 #ifdef IEEE80211_SUPPORT_TDMA 62 #include <netproto/802_11/ieee80211_tdma.h> 63 #endif 64 65 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 66 67 static void adhoc_vattach(struct ieee80211vap *); 68 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); 69 static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int); 70 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 71 int subtype, int, int); 72 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 73 int subtype, int, int); 74 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 75 76 void 77 ieee80211_adhoc_attach(struct ieee80211com *ic) 78 { 79 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach; 80 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach; 81 } 82 83 void 84 ieee80211_adhoc_detach(struct ieee80211com *ic) 85 { 86 } 87 88 static void 89 adhoc_vdetach(struct ieee80211vap *vap) 90 { 91 } 92 93 static void 94 adhoc_vattach(struct ieee80211vap *vap) 95 { 96 vap->iv_newstate = adhoc_newstate; 97 vap->iv_input = adhoc_input; 98 if (vap->iv_opmode == IEEE80211_M_IBSS) 99 vap->iv_recv_mgmt = adhoc_recv_mgmt; 100 else 101 vap->iv_recv_mgmt = ahdemo_recv_mgmt; 102 vap->iv_recv_ctl = adhoc_recv_ctl; 103 vap->iv_opdetach = adhoc_vdetach; 104 #ifdef IEEE80211_SUPPORT_TDMA 105 /* 106 * Throw control to tdma support. Note we do this 107 * after setting up our callbacks so it can piggyback 108 * on top of us. 109 */ 110 if (vap->iv_caps & IEEE80211_C_TDMA) 111 ieee80211_tdma_vattach(vap); 112 #endif 113 } 114 115 static void 116 sta_leave(void *arg, struct ieee80211_node *ni) 117 { 118 struct ieee80211vap *vap = arg; 119 120 if (ni->ni_vap == vap && ni != vap->iv_bss) 121 ieee80211_node_leave(ni); 122 } 123 124 /* 125 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler. 126 */ 127 static int 128 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 129 { 130 struct ieee80211com *ic = vap->iv_ic; 131 struct ieee80211_node *ni; 132 enum ieee80211_state ostate; 133 #ifdef IEEE80211_DEBUG 134 char ethstr[ETHER_ADDRSTRLEN + 1]; 135 #endif 136 137 ostate = vap->iv_state; 138 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 139 __func__, ieee80211_state_name[ostate], 140 ieee80211_state_name[nstate], arg); 141 vap->iv_state = nstate; /* state transition */ 142 if (ostate != IEEE80211_S_SCAN) 143 ieee80211_cancel_scan(vap); /* background scan */ 144 ni = vap->iv_bss; /* NB: no reference held */ 145 switch (nstate) { 146 case IEEE80211_S_INIT: 147 switch (ostate) { 148 case IEEE80211_S_SCAN: 149 ieee80211_cancel_scan(vap); 150 break; 151 default: 152 break; 153 } 154 if (ostate != IEEE80211_S_INIT) { 155 /* NB: optimize INIT -> INIT case */ 156 ieee80211_reset_bss(vap); 157 } 158 break; 159 case IEEE80211_S_SCAN: 160 switch (ostate) { 161 case IEEE80211_S_RUN: /* beacon miss */ 162 /* purge station table; entries are stale */ 163 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap); 164 /* fall thru... */ 165 case IEEE80211_S_INIT: 166 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 167 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 168 /* 169 * Already have a channel; bypass the 170 * scan and startup immediately. 171 */ 172 ieee80211_create_ibss(vap, vap->iv_des_chan); 173 break; 174 } 175 /* 176 * Initiate a scan. We can come here as a result 177 * of an IEEE80211_IOC_SCAN_REQ too in which case 178 * the vap will be marked with IEEE80211_FEXT_SCANREQ 179 * and the scan request parameters will be present 180 * in iv_scanreq. Otherwise we do the default. 181 */ 182 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 183 ieee80211_check_scan(vap, 184 vap->iv_scanreq_flags, 185 vap->iv_scanreq_duration, 186 vap->iv_scanreq_mindwell, 187 vap->iv_scanreq_maxdwell, 188 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 189 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 190 } else 191 ieee80211_check_scan_current(vap); 192 break; 193 case IEEE80211_S_SCAN: 194 /* 195 * This can happen because of a change in state 196 * that requires a reset. Trigger a new scan 197 * unless we're in manual roaming mode in which 198 * case an application must issue an explicit request. 199 */ 200 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 201 ieee80211_check_scan_current(vap); 202 break; 203 default: 204 goto invalid; 205 } 206 break; 207 case IEEE80211_S_RUN: 208 if (vap->iv_flags & IEEE80211_F_WPA) { 209 /* XXX validate prerequisites */ 210 } 211 switch (ostate) { 212 case IEEE80211_S_SCAN: 213 #ifdef IEEE80211_DEBUG 214 if (ieee80211_msg_debug(vap)) { 215 ieee80211_note(vap, 216 "synchronized with %s ssid ", 217 kether_ntoa(ni->ni_bssid, ethstr)); 218 ieee80211_print_essid(vap->iv_bss->ni_essid, 219 ni->ni_esslen); 220 /* XXX MCS/HT */ 221 kprintf(" channel %d start %uMb\n", 222 ieee80211_chan2ieee(ic, ic->ic_curchan), 223 IEEE80211_RATE2MBS(ni->ni_txrate)); 224 } 225 #endif 226 break; 227 default: 228 goto invalid; 229 } 230 /* 231 * When 802.1x is not in use mark the port authorized 232 * at this point so traffic can flow. 233 */ 234 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 235 ieee80211_node_authorize(ni); 236 /* 237 * Fake association when joining an existing bss. 238 */ 239 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 240 ic->ic_newassoc != NULL) 241 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 242 break; 243 case IEEE80211_S_SLEEP: 244 ieee80211_sta_pwrsave(vap, 0); 245 break; 246 default: 247 invalid: 248 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 249 "%s: unexpected state transition %s -> %s\n", __func__, 250 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 251 break; 252 } 253 return 0; 254 } 255 256 /* 257 * Decide if a received management frame should be 258 * printed when debugging is enabled. This filters some 259 * of the less interesting frames that come frequently 260 * (e.g. beacons). 261 */ 262 static __inline int 263 doprint(struct ieee80211vap *vap, int subtype) 264 { 265 switch (subtype) { 266 case IEEE80211_FC0_SUBTYPE_BEACON: 267 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 268 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 269 return 1; 270 } 271 return 1; 272 } 273 274 /* 275 * Process a received frame. The node associated with the sender 276 * should be supplied. If nothing was found in the node table then 277 * the caller is assumed to supply a reference to iv_bss instead. 278 * The RSSI and a timestamp are also supplied. The RSSI data is used 279 * during AP scanning to select a AP to associate with; it can have 280 * any units so long as values have consistent units and higher values 281 * mean ``better signal''. The receive timestamp is currently not used 282 * by the 802.11 layer. 283 */ 284 static int 285 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 286 { 287 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 288 #define HAS_SEQ(type) ((type & 0x4) == 0) 289 struct ieee80211vap *vap = ni->ni_vap; 290 struct ieee80211com *ic = ni->ni_ic; 291 struct ifnet *ifp = vap->iv_ifp; 292 struct ieee80211_frame *wh; 293 struct ieee80211_key *key; 294 struct ether_header *eh; 295 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 296 uint8_t dir, type, subtype, qos; 297 uint8_t *bssid; 298 uint16_t rxseq; 299 #ifdef IEEE80211_DEBUG 300 char ethstr[ETHER_ADDRSTRLEN + 1]; 301 #endif 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 type = -1; /* undefined */ 324 325 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 326 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 327 ni->ni_macaddr, NULL, 328 "too short (1): len %u", m->m_pkthdr.len); 329 vap->iv_stats.is_rx_tooshort++; 330 goto out; 331 } 332 /* 333 * Bit of a cheat here, we use a pointer for a 3-address 334 * frame format but don't reference fields past outside 335 * ieee80211_frame_min w/o first validating the data is 336 * present. 337 */ 338 wh = mtod(m, struct ieee80211_frame *); 339 340 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 341 IEEE80211_FC0_VERSION_0) { 342 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 343 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 344 wh->i_fc[0], wh->i_fc[1]); 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 = nf; 411 if (HAS_SEQ(type)) { 412 uint8_t tid = ieee80211_gettid(wh); 413 if (IEEE80211_QOS_HAS_SEQ(wh) && 414 TID_TO_WME_AC(tid) >= WME_AC_VI) 415 ic->ic_wme.wme_hipri_traffic++; 416 rxseq = le16toh(*(uint16_t *)wh->i_seq); 417 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 418 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 419 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 420 /* duplicate, discard */ 421 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 422 bssid, "duplicate", 423 "seqno <%u,%u> fragno <%u,%u> tid %u", 424 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 425 ni->ni_rxseqs[tid] >> 426 IEEE80211_SEQ_SEQ_SHIFT, 427 rxseq & IEEE80211_SEQ_FRAG_MASK, 428 ni->ni_rxseqs[tid] & 429 IEEE80211_SEQ_FRAG_MASK, 430 tid); 431 vap->iv_stats.is_rx_dup++; 432 IEEE80211_NODE_STAT(ni, rx_dup); 433 goto out; 434 } 435 ni->ni_rxseqs[tid] = rxseq; 436 } 437 } 438 439 switch (type) { 440 case IEEE80211_FC0_TYPE_DATA: 441 hdrspace = ieee80211_hdrspace(ic, wh); 442 if (m->m_len < hdrspace && 443 (m = m_pullup(m, hdrspace)) == NULL) { 444 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 445 ni->ni_macaddr, NULL, 446 "data too short: expecting %u", hdrspace); 447 vap->iv_stats.is_rx_tooshort++; 448 goto out; /* XXX */ 449 } 450 if (dir != IEEE80211_FC1_DIR_NODS) { 451 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 452 wh, "data", "incorrect dir 0x%x", dir); 453 vap->iv_stats.is_rx_wrongdir++; 454 goto out; 455 } 456 /* XXX no power-save support */ 457 458 /* 459 * Handle A-MPDU re-ordering. If the frame is to be 460 * processed directly then ieee80211_ampdu_reorder 461 * will return 0; otherwise it has consumed the mbuf 462 * and we should do nothing more with it. 463 */ 464 if ((m->m_flags & M_AMPDU) && 465 ieee80211_ampdu_reorder(ni, m) != 0) { 466 m = NULL; 467 goto out; 468 } 469 resubmit_ampdu: 470 471 /* 472 * Handle privacy requirements. Note that we 473 * must not be preempted from here until after 474 * we (potentially) call ieee80211_crypto_demic; 475 * otherwise we may violate assumptions in the 476 * crypto cipher modules used to do delayed update 477 * of replay sequence numbers. 478 */ 479 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 480 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 481 /* 482 * Discard encrypted frames when privacy is off. 483 */ 484 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 485 wh, "WEP", "%s", "PRIVACY off"); 486 vap->iv_stats.is_rx_noprivacy++; 487 IEEE80211_NODE_STAT(ni, rx_noprivacy); 488 goto out; 489 } 490 key = ieee80211_crypto_decap(ni, m, hdrspace); 491 if (key == NULL) { 492 /* NB: stats+msgs handled in crypto_decap */ 493 IEEE80211_NODE_STAT(ni, rx_wepfail); 494 goto out; 495 } 496 wh = mtod(m, struct ieee80211_frame *); 497 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 498 } else { 499 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 500 key = NULL; 501 } 502 503 /* 504 * Save QoS bits for use below--before we strip the header. 505 */ 506 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 507 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 508 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 509 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 510 } else 511 qos = 0; 512 513 /* 514 * Next up, any fragmentation. 515 */ 516 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 517 m = ieee80211_defrag(ni, m, hdrspace); 518 if (m == NULL) { 519 /* Fragment dropped or frame not complete yet */ 520 goto out; 521 } 522 } 523 wh = NULL; /* no longer valid, catch any uses */ 524 525 /* 526 * Next strip any MSDU crypto bits. 527 */ 528 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 529 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 530 ni->ni_macaddr, "data", "%s", "demic error"); 531 vap->iv_stats.is_rx_demicfail++; 532 IEEE80211_NODE_STAT(ni, rx_demicfail); 533 goto out; 534 } 535 536 /* copy to listener after decrypt */ 537 if (ieee80211_radiotap_active_vap(vap)) 538 ieee80211_radiotap_rx(vap, m); 539 need_tap = 0; 540 541 /* 542 * Finally, strip the 802.11 header. 543 */ 544 m = ieee80211_decap(vap, m, hdrspace); 545 if (m == NULL) { 546 /* XXX mask bit to check for both */ 547 /* don't count Null data frames as errors */ 548 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 549 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 550 goto out; 551 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 552 ni->ni_macaddr, "data", "%s", "decap error"); 553 vap->iv_stats.is_rx_decap++; 554 IEEE80211_NODE_STAT(ni, rx_decap); 555 goto err; 556 } 557 eh = mtod(m, struct ether_header *); 558 if (!ieee80211_node_is_authorized(ni)) { 559 /* 560 * Deny any non-PAE frames received prior to 561 * authorization. For open/shared-key 562 * authentication the port is mark authorized 563 * after authentication completes. For 802.1x 564 * the port is not marked authorized by the 565 * authenticator until the handshake has completed. 566 */ 567 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 568 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 569 eh->ether_shost, "data", 570 "unauthorized port: ether type 0x%x len %u", 571 eh->ether_type, m->m_pkthdr.len); 572 vap->iv_stats.is_rx_unauth++; 573 IEEE80211_NODE_STAT(ni, rx_unauth); 574 goto err; 575 } 576 } else { 577 /* 578 * When denying unencrypted frames, discard 579 * any non-PAE frames received without encryption. 580 */ 581 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 582 (key == NULL && (m->m_flags & M_WEP) == 0) && 583 eh->ether_type != htons(ETHERTYPE_PAE)) { 584 /* 585 * Drop unencrypted frames. 586 */ 587 vap->iv_stats.is_rx_unencrypted++; 588 IEEE80211_NODE_STAT(ni, rx_unencrypted); 589 goto out; 590 } 591 } 592 /* XXX require HT? */ 593 if (qos & IEEE80211_QOS_AMSDU) { 594 m = ieee80211_decap_amsdu(ni, m); 595 if (m == NULL) 596 return IEEE80211_FC0_TYPE_DATA; 597 } else { 598 #ifdef IEEE80211_SUPPORT_SUPERG 599 m = ieee80211_decap_fastframe(vap, ni, m); 600 if (m == NULL) 601 return IEEE80211_FC0_TYPE_DATA; 602 #endif 603 } 604 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 605 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 606 else 607 ieee80211_deliver_data(vap, ni, m); 608 return IEEE80211_FC0_TYPE_DATA; 609 610 case IEEE80211_FC0_TYPE_MGT: 611 vap->iv_stats.is_rx_mgmt++; 612 IEEE80211_NODE_STAT(ni, rx_mgmt); 613 if (dir != IEEE80211_FC1_DIR_NODS) { 614 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 615 wh, "data", "incorrect dir 0x%x", dir); 616 vap->iv_stats.is_rx_wrongdir++; 617 goto err; 618 } 619 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 620 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 621 ni->ni_macaddr, "mgt", "too short: len %u", 622 m->m_pkthdr.len); 623 vap->iv_stats.is_rx_tooshort++; 624 goto out; 625 } 626 #ifdef IEEE80211_DEBUG 627 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 628 ieee80211_msg_dumppkts(vap)) { 629 if_printf(ifp, "received %s from %s rssi %d\n", 630 ieee80211_mgt_subtype_name[subtype >> 631 IEEE80211_FC0_SUBTYPE_SHIFT], 632 kether_ntoa(wh->i_addr2, ethstr), rssi); 633 } 634 #endif 635 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 636 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 637 wh, NULL, "%s", "WEP set but not permitted"); 638 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 639 goto out; 640 } 641 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 642 goto out; 643 644 case IEEE80211_FC0_TYPE_CTL: 645 vap->iv_stats.is_rx_ctl++; 646 IEEE80211_NODE_STAT(ni, rx_ctrl); 647 vap->iv_recv_ctl(ni, m, subtype); 648 goto out; 649 650 default: 651 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 652 wh, "bad", "frame type 0x%x", type); 653 /* should not come here */ 654 break; 655 } 656 err: 657 IFNET_STAT_INC(ifp, ierrors, 1); 658 out: 659 if (m != NULL) { 660 if (need_tap && ieee80211_radiotap_active_vap(vap)) 661 ieee80211_radiotap_rx(vap, m); 662 m_freem(m); 663 } 664 return type; 665 #undef SEQ_LEQ 666 } 667 668 static int 669 is11bclient(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 } 684 685 static void 686 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 687 int subtype, int rssi, int nf) 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; 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, subtype, rssi, nf); 733 return; 734 } 735 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 736 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 737 /* 738 * Create a new entry in the neighbor table. 739 */ 740 ni = ieee80211_add_neighbor(vap, wh, &scan); 741 } else if (ni->ni_capinfo == 0) { 742 /* 743 * Update faked node created on transmit. 744 * Note this also updates the tsf. 745 */ 746 ieee80211_init_neighbor(ni, wh, &scan); 747 } else { 748 /* 749 * Record tsf for potential resync. 750 */ 751 memcpy(ni->ni_tstamp.data, scan.tstamp, 752 sizeof(ni->ni_tstamp)); 753 } 754 if (ni != NULL) { 755 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 756 ni->ni_noise = nf; 757 } 758 } 759 break; 760 } 761 762 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 763 if (vap->iv_state != IEEE80211_S_RUN) { 764 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 765 wh, NULL, "wrong state %s", 766 ieee80211_state_name[vap->iv_state]); 767 vap->iv_stats.is_rx_mgtdiscard++; 768 return; 769 } 770 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 771 /* frame must be directed */ 772 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 773 wh, NULL, "%s", "not unicast"); 774 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 775 return; 776 } 777 778 /* 779 * prreq frame format 780 * [tlv] ssid 781 * [tlv] supported rates 782 * [tlv] extended supported rates 783 */ 784 ssid = rates = xrates = NULL; 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, wh, 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 907 908 static void 909 ahdemo_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 } 924 925 static void 926 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) 927 { 928 } 929