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("$FreeBSD$"); 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 69 static void adhoc_vattach(struct ieee80211vap *); 70 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); 71 static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int); 72 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 73 int subtype, int, int); 74 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 75 int subtype, int, int); 76 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 77 78 void 79 ieee80211_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 85 void 86 ieee80211_adhoc_detach(struct ieee80211com *ic) 87 { 88 } 89 90 static void 91 adhoc_vdetach(struct ieee80211vap *vap) 92 { 93 } 94 95 static void 96 adhoc_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 } 116 117 static void 118 sta_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 */ 129 static int 130 adhoc_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 */ 263 static __inline int 264 doprint(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 */ 285 static int 286 adhoc_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 = 1; /* mbuf need to be tapped. */ 297 uint8_t dir, type, subtype, qos; 298 uint8_t *bssid; 299 uint16_t rxseq; 300 301 if (m->m_flags & M_AMPDU_MPDU) { 302 /* 303 * Fastpath for A-MPDU reorder q resubmission. Frames 304 * w/ M_AMPDU_MPDU marked have already passed through 305 * here but were received out of order and been held on 306 * the reorder queue. When resubmitted they are marked 307 * with the M_AMPDU_MPDU flag and we can bypass most of 308 * the normal processing. 309 */ 310 wh = mtod(m, struct ieee80211_frame *); 311 type = IEEE80211_FC0_TYPE_DATA; 312 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 313 subtype = IEEE80211_FC0_SUBTYPE_QOS; 314 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 315 goto resubmit_ampdu; 316 } 317 318 KASSERT(ni != NULL, ("null node")); 319 ni->ni_inact = ni->ni_inact_reload; 320 321 type = -1; /* undefined */ 322 323 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 324 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 325 ni->ni_macaddr, NULL, 326 "too short (1): len %u", m->m_pkthdr.len); 327 vap->iv_stats.is_rx_tooshort++; 328 goto out; 329 } 330 /* 331 * Bit of a cheat here, we use a pointer for a 3-address 332 * frame format but don't reference fields past outside 333 * ieee80211_frame_min w/o first validating the data is 334 * present. 335 */ 336 wh = mtod(m, struct ieee80211_frame *); 337 338 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 339 IEEE80211_FC0_VERSION_0) { 340 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 341 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 342 wh->i_fc[0], wh->i_fc[1]); 343 vap->iv_stats.is_rx_badversion++; 344 goto err; 345 } 346 347 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 348 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 349 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 350 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 351 if (dir != IEEE80211_FC1_DIR_NODS) 352 bssid = wh->i_addr1; 353 else if (type == IEEE80211_FC0_TYPE_CTL) 354 bssid = wh->i_addr1; 355 else { 356 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 357 IEEE80211_DISCARD_MAC(vap, 358 IEEE80211_MSG_ANY, ni->ni_macaddr, 359 NULL, "too short (2): len %u", 360 m->m_pkthdr.len); 361 vap->iv_stats.is_rx_tooshort++; 362 goto out; 363 } 364 bssid = wh->i_addr3; 365 } 366 /* 367 * Validate the bssid. 368 */ 369 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 370 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 371 /* not interested in */ 372 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 373 bssid, NULL, "%s", "not to bss"); 374 vap->iv_stats.is_rx_wrongbss++; 375 goto out; 376 } 377 /* 378 * Data frame, cons up a node when it doesn't 379 * exist. This should probably done after an ACL check. 380 */ 381 if (type == IEEE80211_FC0_TYPE_DATA && 382 ni == vap->iv_bss && 383 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 384 /* 385 * Beware of frames that come in too early; we 386 * can receive broadcast frames and creating sta 387 * entries will blow up because there is no bss 388 * channel yet. 389 */ 390 if (vap->iv_state != IEEE80211_S_RUN) { 391 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 392 wh, "data", "not in RUN state (%s)", 393 ieee80211_state_name[vap->iv_state]); 394 vap->iv_stats.is_rx_badstate++; 395 goto err; 396 } 397 /* 398 * Fake up a node for this newly 399 * discovered member of the IBSS. 400 */ 401 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 402 if (ni == NULL) { 403 /* NB: stat kept for alloc failure */ 404 goto err; 405 } 406 } 407 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 408 ni->ni_noise = nf; 409 if (HAS_SEQ(type)) { 410 uint8_t tid = ieee80211_gettid(wh); 411 if (IEEE80211_QOS_HAS_SEQ(wh) && 412 TID_TO_WME_AC(tid) >= WME_AC_VI) 413 ic->ic_wme.wme_hipri_traffic++; 414 rxseq = le16toh(*(uint16_t *)wh->i_seq); 415 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 416 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 417 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 418 /* duplicate, discard */ 419 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 420 bssid, "duplicate", 421 "seqno <%u,%u> fragno <%u,%u> tid %u", 422 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 423 ni->ni_rxseqs[tid] >> 424 IEEE80211_SEQ_SEQ_SHIFT, 425 rxseq & IEEE80211_SEQ_FRAG_MASK, 426 ni->ni_rxseqs[tid] & 427 IEEE80211_SEQ_FRAG_MASK, 428 tid); 429 vap->iv_stats.is_rx_dup++; 430 IEEE80211_NODE_STAT(ni, rx_dup); 431 goto out; 432 } 433 ni->ni_rxseqs[tid] = rxseq; 434 } 435 } 436 437 switch (type) { 438 case IEEE80211_FC0_TYPE_DATA: 439 hdrspace = ieee80211_hdrspace(ic, wh); 440 if (m->m_len < hdrspace && 441 (m = m_pullup(m, hdrspace)) == NULL) { 442 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 443 ni->ni_macaddr, NULL, 444 "data too short: expecting %u", hdrspace); 445 vap->iv_stats.is_rx_tooshort++; 446 goto out; /* XXX */ 447 } 448 if (dir != IEEE80211_FC1_DIR_NODS) { 449 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 450 wh, "data", "incorrect dir 0x%x", dir); 451 vap->iv_stats.is_rx_wrongdir++; 452 goto out; 453 } 454 /* XXX no power-save support */ 455 456 /* 457 * Handle A-MPDU re-ordering. If the frame is to be 458 * processed directly then ieee80211_ampdu_reorder 459 * will return 0; otherwise it has consumed the mbuf 460 * and we should do nothing more with it. 461 */ 462 if ((m->m_flags & M_AMPDU) && 463 ieee80211_ampdu_reorder(ni, m) != 0) { 464 m = NULL; 465 goto out; 466 } 467 resubmit_ampdu: 468 469 /* 470 * Handle privacy requirements. Note that we 471 * must not be preempted from here until after 472 * we (potentially) call ieee80211_crypto_demic; 473 * otherwise we may violate assumptions in the 474 * crypto cipher modules used to do delayed update 475 * of replay sequence numbers. 476 */ 477 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 478 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 479 /* 480 * Discard encrypted frames when privacy is off. 481 */ 482 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 483 wh, "WEP", "%s", "PRIVACY off"); 484 vap->iv_stats.is_rx_noprivacy++; 485 IEEE80211_NODE_STAT(ni, rx_noprivacy); 486 goto out; 487 } 488 key = ieee80211_crypto_decap(ni, m, hdrspace); 489 if (key == NULL) { 490 /* NB: stats+msgs handled in crypto_decap */ 491 IEEE80211_NODE_STAT(ni, rx_wepfail); 492 goto out; 493 } 494 wh = mtod(m, struct ieee80211_frame *); 495 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 496 } else { 497 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 498 key = NULL; 499 } 500 501 /* 502 * Save QoS bits for use below--before we strip the header. 503 */ 504 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 505 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 506 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 507 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 508 } else 509 qos = 0; 510 511 /* 512 * Next up, any fragmentation. 513 */ 514 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 515 m = ieee80211_defrag(ni, m, hdrspace); 516 if (m == NULL) { 517 /* Fragment dropped or frame not complete yet */ 518 goto out; 519 } 520 } 521 wh = NULL; /* no longer valid, catch any uses */ 522 523 /* 524 * Next strip any MSDU crypto bits. 525 */ 526 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 527 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 528 ni->ni_macaddr, "data", "%s", "demic error"); 529 vap->iv_stats.is_rx_demicfail++; 530 IEEE80211_NODE_STAT(ni, rx_demicfail); 531 goto out; 532 } 533 534 /* copy to listener after decrypt */ 535 if (ieee80211_radiotap_active_vap(vap)) 536 ieee80211_radiotap_rx(vap, m); 537 need_tap = 0; 538 539 /* 540 * Finally, strip the 802.11 header. 541 */ 542 m = ieee80211_decap(vap, m, hdrspace); 543 if (m == NULL) { 544 /* XXX mask bit to check for both */ 545 /* don't count Null data frames as errors */ 546 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 547 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 548 goto out; 549 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 550 ni->ni_macaddr, "data", "%s", "decap error"); 551 vap->iv_stats.is_rx_decap++; 552 IEEE80211_NODE_STAT(ni, rx_decap); 553 goto err; 554 } 555 eh = mtod(m, struct ether_header *); 556 if (!ieee80211_node_is_authorized(ni)) { 557 /* 558 * Deny any non-PAE frames received prior to 559 * authorization. For open/shared-key 560 * authentication the port is mark authorized 561 * after authentication completes. For 802.1x 562 * the port is not marked authorized by the 563 * authenticator until the handshake has completed. 564 */ 565 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 566 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 567 eh->ether_shost, "data", 568 "unauthorized port: ether type 0x%x len %u", 569 eh->ether_type, m->m_pkthdr.len); 570 vap->iv_stats.is_rx_unauth++; 571 IEEE80211_NODE_STAT(ni, rx_unauth); 572 goto err; 573 } 574 } else { 575 /* 576 * When denying unencrypted frames, discard 577 * any non-PAE frames received without encryption. 578 */ 579 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 580 (key == NULL && (m->m_flags & M_WEP) == 0) && 581 eh->ether_type != htons(ETHERTYPE_PAE)) { 582 /* 583 * Drop unencrypted frames. 584 */ 585 vap->iv_stats.is_rx_unencrypted++; 586 IEEE80211_NODE_STAT(ni, rx_unencrypted); 587 goto out; 588 } 589 } 590 /* XXX require HT? */ 591 if (qos & IEEE80211_QOS_AMSDU) { 592 m = ieee80211_decap_amsdu(ni, m); 593 if (m == NULL) 594 return IEEE80211_FC0_TYPE_DATA; 595 } else { 596 #ifdef IEEE80211_SUPPORT_SUPERG 597 m = ieee80211_decap_fastframe(vap, ni, m); 598 if (m == NULL) 599 return IEEE80211_FC0_TYPE_DATA; 600 #endif 601 } 602 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 603 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 604 else 605 ieee80211_deliver_data(vap, ni, m); 606 return IEEE80211_FC0_TYPE_DATA; 607 608 case IEEE80211_FC0_TYPE_MGT: 609 vap->iv_stats.is_rx_mgmt++; 610 IEEE80211_NODE_STAT(ni, rx_mgmt); 611 if (dir != IEEE80211_FC1_DIR_NODS) { 612 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 613 wh, "data", "incorrect dir 0x%x", dir); 614 vap->iv_stats.is_rx_wrongdir++; 615 goto err; 616 } 617 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 618 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 619 ni->ni_macaddr, "mgt", "too short: len %u", 620 m->m_pkthdr.len); 621 vap->iv_stats.is_rx_tooshort++; 622 goto out; 623 } 624 #ifdef IEEE80211_DEBUG 625 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 626 ieee80211_msg_dumppkts(vap)) { 627 if_printf(ifp, "received %s from %s rssi %d\n", 628 ieee80211_mgt_subtype_name[subtype >> 629 IEEE80211_FC0_SUBTYPE_SHIFT], 630 ether_sprintf(wh->i_addr2), rssi); 631 } 632 #endif 633 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 634 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 635 wh, NULL, "%s", "WEP set but not permitted"); 636 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 637 goto out; 638 } 639 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 640 goto out; 641 642 case IEEE80211_FC0_TYPE_CTL: 643 vap->iv_stats.is_rx_ctl++; 644 IEEE80211_NODE_STAT(ni, rx_ctrl); 645 vap->iv_recv_ctl(ni, m, subtype); 646 goto out; 647 648 default: 649 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 650 wh, "bad", "frame type 0x%x", type); 651 /* should not come here */ 652 break; 653 } 654 err: 655 ifp->if_ierrors++; 656 out: 657 if (m != NULL) { 658 if (need_tap && ieee80211_radiotap_active_vap(vap)) 659 ieee80211_radiotap_rx(vap, m); 660 m_freem(m); 661 } 662 return type; 663 #undef SEQ_LEQ 664 } 665 666 static int 667 is11bclient(const uint8_t *rates, const uint8_t *xrates) 668 { 669 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 670 int i; 671 672 /* NB: the 11b clients we care about will not have xrates */ 673 if (xrates != NULL || rates == NULL) 674 return 0; 675 for (i = 0; i < rates[1]; i++) { 676 int r = rates[2+i] & IEEE80211_RATE_VAL; 677 if (r > 2*11 || ((1<<r) & brates) == 0) 678 return 0; 679 } 680 return 1; 681 } 682 683 static void 684 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 685 int subtype, int rssi, int nf) 686 { 687 struct ieee80211vap *vap = ni->ni_vap; 688 struct ieee80211com *ic = ni->ni_ic; 689 struct ieee80211_frame *wh; 690 uint8_t *frm, *efrm, *sfrm; 691 uint8_t *ssid, *rates, *xrates; 692 693 wh = mtod(m0, struct ieee80211_frame *); 694 frm = (uint8_t *)&wh[1]; 695 efrm = mtod(m0, uint8_t *) + m0->m_len; 696 switch (subtype) { 697 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 698 case IEEE80211_FC0_SUBTYPE_BEACON: { 699 struct ieee80211_scanparams scan; 700 /* 701 * We process beacon/probe response 702 * frames to discover neighbors. 703 */ 704 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 705 return; 706 /* 707 * Count frame now that we know it's to be processed. 708 */ 709 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 710 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 711 IEEE80211_NODE_STAT(ni, rx_beacons); 712 } else 713 IEEE80211_NODE_STAT(ni, rx_proberesp); 714 /* 715 * If scanning, just pass information to the scan module. 716 */ 717 if (ic->ic_flags & IEEE80211_F_SCAN) { 718 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 719 /* 720 * Actively scanning a channel marked passive; 721 * send a probe request now that we know there 722 * is 802.11 traffic present. 723 * 724 * XXX check if the beacon we recv'd gives 725 * us what we need and suppress the probe req 726 */ 727 ieee80211_probe_curchan(vap, 1); 728 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 729 } 730 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 731 return; 732 } 733 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 734 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 735 /* 736 * Create a new entry in the neighbor table. 737 */ 738 ni = ieee80211_add_neighbor(vap, wh, &scan); 739 } else if (ni->ni_capinfo == 0) { 740 /* 741 * Update faked node created on transmit. 742 * Note this also updates the tsf. 743 */ 744 ieee80211_init_neighbor(ni, wh, &scan); 745 } else { 746 /* 747 * Record tsf for potential resync. 748 */ 749 memcpy(ni->ni_tstamp.data, scan.tstamp, 750 sizeof(ni->ni_tstamp)); 751 } 752 if (ni != NULL) { 753 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 754 ni->ni_noise = nf; 755 } 756 } 757 break; 758 } 759 760 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 761 if (vap->iv_state != IEEE80211_S_RUN) { 762 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 763 wh, NULL, "wrong state %s", 764 ieee80211_state_name[vap->iv_state]); 765 vap->iv_stats.is_rx_mgtdiscard++; 766 return; 767 } 768 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 769 /* frame must be directed */ 770 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 771 wh, NULL, "%s", "not unicast"); 772 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 773 return; 774 } 775 776 /* 777 * prreq frame format 778 * [tlv] ssid 779 * [tlv] supported rates 780 * [tlv] extended supported rates 781 */ 782 ssid = rates = xrates = NULL; 783 sfrm = frm; 784 while (efrm - frm > 1) { 785 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 786 switch (*frm) { 787 case IEEE80211_ELEMID_SSID: 788 ssid = frm; 789 break; 790 case IEEE80211_ELEMID_RATES: 791 rates = frm; 792 break; 793 case IEEE80211_ELEMID_XRATES: 794 xrates = frm; 795 break; 796 } 797 frm += frm[1] + 2; 798 } 799 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 800 if (xrates != NULL) 801 IEEE80211_VERIFY_ELEMENT(xrates, 802 IEEE80211_RATE_MAXSIZE - rates[1], return); 803 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 804 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 805 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 806 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 807 wh, NULL, 808 "%s", "no ssid with ssid suppression enabled"); 809 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 810 return; 811 } 812 813 /* XXX find a better class or define it's own */ 814 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 815 "%s", "recv probe req"); 816 /* 817 * Some legacy 11b clients cannot hack a complete 818 * probe response frame. When the request includes 819 * only a bare-bones rate set, communicate this to 820 * the transmit side. 821 */ 822 ieee80211_send_proberesp(vap, wh->i_addr2, 823 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 824 break; 825 826 case IEEE80211_FC0_SUBTYPE_ACTION: { 827 const struct ieee80211_action *ia; 828 829 if (vap->iv_state != IEEE80211_S_RUN) { 830 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 831 wh, NULL, "wrong state %s", 832 ieee80211_state_name[vap->iv_state]); 833 vap->iv_stats.is_rx_mgtdiscard++; 834 return; 835 } 836 /* 837 * action frame format: 838 * [1] category 839 * [1] action 840 * [tlv] parameters 841 */ 842 IEEE80211_VERIFY_LENGTH(efrm - frm, 843 sizeof(struct ieee80211_action), return); 844 ia = (const struct ieee80211_action *) frm; 845 846 vap->iv_stats.is_rx_action++; 847 IEEE80211_NODE_STAT(ni, rx_action); 848 849 /* verify frame payloads but defer processing */ 850 /* XXX maybe push this to method */ 851 switch (ia->ia_category) { 852 case IEEE80211_ACTION_CAT_BA: 853 switch (ia->ia_action) { 854 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 855 IEEE80211_VERIFY_LENGTH(efrm - frm, 856 sizeof(struct ieee80211_action_ba_addbarequest), 857 return); 858 break; 859 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 860 IEEE80211_VERIFY_LENGTH(efrm - frm, 861 sizeof(struct ieee80211_action_ba_addbaresponse), 862 return); 863 break; 864 case IEEE80211_ACTION_BA_DELBA: 865 IEEE80211_VERIFY_LENGTH(efrm - frm, 866 sizeof(struct ieee80211_action_ba_delba), 867 return); 868 break; 869 } 870 break; 871 case IEEE80211_ACTION_CAT_HT: 872 switch (ia->ia_action) { 873 case IEEE80211_ACTION_HT_TXCHWIDTH: 874 IEEE80211_VERIFY_LENGTH(efrm - frm, 875 sizeof(struct ieee80211_action_ht_txchwidth), 876 return); 877 break; 878 } 879 break; 880 } 881 ic->ic_recv_action(ni, wh, frm, efrm); 882 break; 883 } 884 885 case IEEE80211_FC0_SUBTYPE_AUTH: 886 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 887 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 888 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 889 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 890 case IEEE80211_FC0_SUBTYPE_DEAUTH: 891 case IEEE80211_FC0_SUBTYPE_DISASSOC: 892 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 893 wh, NULL, "%s", "not handled"); 894 vap->iv_stats.is_rx_mgtdiscard++; 895 return; 896 897 default: 898 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 899 wh, "mgt", "subtype 0x%x not handled", subtype); 900 vap->iv_stats.is_rx_badsubtype++; 901 break; 902 } 903 } 904 #undef IEEE80211_VERIFY_LENGTH 905 #undef IEEE80211_VERIFY_ELEMENT 906 907 static void 908 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 909 int subtype, int rssi, int nf) 910 { 911 struct ieee80211vap *vap = ni->ni_vap; 912 struct ieee80211com *ic = ni->ni_ic; 913 914 /* 915 * Process management frames when scanning; useful for doing 916 * a site-survey. 917 */ 918 if (ic->ic_flags & IEEE80211_F_SCAN) 919 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf); 920 else 921 vap->iv_stats.is_rx_mgtdiscard++; 922 } 923 924 static void 925 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 926 { 927 928 switch (subtype) { 929 case IEEE80211_FC0_SUBTYPE_BAR: 930 ieee80211_recv_bar(ni, m); 931 break; 932 } 933 } 934