Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net80211/ieee80211_input.c
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1 /*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2007 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/mbuf.h> 33 #include <sys/malloc.h> 34 #include <sys/endian.h> 35 #include <sys/kernel.h> 36 37 #include <sys/socket.h> 38 39 #include <net/if.h> 40 #include <net/if_media.h> 41 #include <net/ethernet.h> 42 #include <net/if_llc.h> 43 #include <net/if_vlan_var.h> 44 45 #include <net80211/ieee80211_var.h> 46 47 #include <net/bpf.h> 48 49 #ifdef IEEE80211_DEBUG 50 #include <machine/stdarg.h> 51 52 /* 53 * Decide if a received management frame should be 54 * printed when debugging is enabled. This filters some 55 * of the less interesting frames that come frequently 56 * (e.g. beacons). 57 */ 58 static __inline int 59 doprint(struct ieee80211com *ic, int subtype) 60 { 61 switch (subtype) { 62 case IEEE80211_FC0_SUBTYPE_BEACON: 63 return (ic->ic_flags & IEEE80211_F_SCAN); 64 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 65 return (ic->ic_opmode == IEEE80211_M_IBSS); 66 } 67 return 1; 68 } 69 70 static const uint8_t *ieee80211_getbssid(struct ieee80211com *, 71 const struct ieee80211_frame *); 72 #endif /* IEEE80211_DEBUG */ 73 74 static struct mbuf *ieee80211_defrag(struct ieee80211com *, 75 struct ieee80211_node *, struct mbuf *, int); 76 static struct mbuf *ieee80211_decap(struct ieee80211com *, struct mbuf *, int); 77 static void ieee80211_send_error(struct ieee80211com *, struct ieee80211_node *, 78 const uint8_t *mac, int subtype, int arg); 79 static struct mbuf *ieee80211_decap_fastframe(struct ieee80211com *, 80 struct ieee80211_node *, struct mbuf *); 81 static void ieee80211_recv_pspoll(struct ieee80211com *, 82 struct ieee80211_node *, struct mbuf *); 83 84 /* 85 * Process a received frame. The node associated with the sender 86 * should be supplied. If nothing was found in the node table then 87 * the caller is assumed to supply a reference to ic_bss instead. 88 * The RSSI and a timestamp are also supplied. The RSSI data is used 89 * during AP scanning to select a AP to associate with; it can have 90 * any units so long as values have consistent units and higher values 91 * mean ``better signal''. The receive timestamp is currently not used 92 * by the 802.11 layer. 93 */ 94 int 95 ieee80211_input(struct ieee80211com *ic, struct mbuf *m, 96 struct ieee80211_node *ni, int rssi, int noise, uint32_t rstamp) 97 { 98 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 99 #define HAS_SEQ(type) ((type & 0x4) == 0) 100 struct ifnet *ifp = ic->ic_ifp; 101 struct ieee80211_frame *wh; 102 struct ieee80211_key *key; 103 struct ether_header *eh; 104 int hdrspace, need_tap; 105 uint8_t dir, type, subtype, qos; 106 uint8_t *bssid; 107 uint16_t rxseq; 108 109 if (m->m_flags & M_AMPDU) { 110 /* 111 * Fastpath for A-MPDU reorder q resubmission. Frames 112 * w/ M_AMPDU marked have already passed through here 113 * but were received out of order and been held on the 114 * reorder queue. When resubmitted they are marked 115 * with the M_AMPDU flag and we can bypass most of the 116 * normal processing. 117 */ 118 wh = mtod(m, struct ieee80211_frame *); 119 type = IEEE80211_FC0_TYPE_DATA; 120 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 121 subtype = IEEE80211_FC0_SUBTYPE_QOS; 122 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 123 need_tap = 0; 124 goto resubmit_ampdu; 125 } 126 127 KASSERT(ni != NULL, ("null node")); 128 ni->ni_inact = ni->ni_inact_reload; 129 130 need_tap = 1; /* mbuf need to be tapped. */ 131 type = -1; /* undefined */ 132 /* 133 * In monitor mode, send everything directly to bpf. 134 * XXX may want to include the CRC 135 */ 136 if (ic->ic_opmode == IEEE80211_M_MONITOR) 137 goto out; 138 139 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 140 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 141 ni->ni_macaddr, NULL, 142 "too short (1): len %u", m->m_pkthdr.len); 143 ic->ic_stats.is_rx_tooshort++; 144 goto out; 145 } 146 /* 147 * Bit of a cheat here, we use a pointer for a 3-address 148 * frame format but don't reference fields past outside 149 * ieee80211_frame_min w/o first validating the data is 150 * present. 151 */ 152 wh = mtod(m, struct ieee80211_frame *); 153 154 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 155 IEEE80211_FC0_VERSION_0) { 156 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 157 ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]); 158 ic->ic_stats.is_rx_badversion++; 159 goto err; 160 } 161 162 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 163 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 164 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 165 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 166 switch (ic->ic_opmode) { 167 case IEEE80211_M_STA: 168 bssid = wh->i_addr2; 169 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 170 /* not interested in */ 171 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 172 bssid, NULL, "%s", "not to bss"); 173 ic->ic_stats.is_rx_wrongbss++; 174 goto out; 175 } 176 break; 177 case IEEE80211_M_IBSS: 178 case IEEE80211_M_AHDEMO: 179 case IEEE80211_M_HOSTAP: 180 if (dir != IEEE80211_FC1_DIR_NODS) 181 bssid = wh->i_addr1; 182 else if (type == IEEE80211_FC0_TYPE_CTL) 183 bssid = wh->i_addr1; 184 else { 185 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 186 IEEE80211_DISCARD_MAC(ic, 187 IEEE80211_MSG_ANY, ni->ni_macaddr, 188 NULL, "too short (2): len %u", 189 m->m_pkthdr.len); 190 ic->ic_stats.is_rx_tooshort++; 191 goto out; 192 } 193 bssid = wh->i_addr3; 194 } 195 if (type != IEEE80211_FC0_TYPE_DATA) 196 break; 197 /* 198 * Data frame, validate the bssid. 199 */ 200 if (!IEEE80211_ADDR_EQ(bssid, ic->ic_bss->ni_bssid) && 201 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 202 /* not interested in */ 203 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 204 bssid, NULL, "%s", "not to bss"); 205 ic->ic_stats.is_rx_wrongbss++; 206 goto out; 207 } 208 /* 209 * For adhoc mode we cons up a node when it doesn't 210 * exist. This should probably done after an ACL check. 211 */ 212 if (ni == ic->ic_bss && 213 ic->ic_opmode != IEEE80211_M_HOSTAP && 214 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 215 /* 216 * Fake up a node for this newly 217 * discovered member of the IBSS. 218 */ 219 ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta, 220 wh->i_addr2); 221 if (ni == NULL) { 222 /* NB: stat kept for alloc failure */ 223 goto err; 224 } 225 } 226 break; 227 default: 228 goto out; 229 } 230 ni->ni_rssi = rssi; 231 ni->ni_noise = noise; 232 ni->ni_rstamp = rstamp; 233 if (HAS_SEQ(type)) { 234 uint8_t tid; 235 if (IEEE80211_QOS_HAS_SEQ(wh)) { 236 tid = ((struct ieee80211_qosframe *)wh)-> 237 i_qos[0] & IEEE80211_QOS_TID; 238 if (TID_TO_WME_AC(tid) >= WME_AC_VI) 239 ic->ic_wme.wme_hipri_traffic++; 240 tid++; 241 } else 242 tid = IEEE80211_NONQOS_TID; 243 rxseq = le16toh(*(uint16_t *)wh->i_seq); 244 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 245 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 246 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 247 /* duplicate, discard */ 248 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 249 bssid, "duplicate", 250 "seqno <%u,%u> fragno <%u,%u> tid %u", 251 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 252 ni->ni_rxseqs[tid] >> 253 IEEE80211_SEQ_SEQ_SHIFT, 254 rxseq & IEEE80211_SEQ_FRAG_MASK, 255 ni->ni_rxseqs[tid] & 256 IEEE80211_SEQ_FRAG_MASK, 257 tid); 258 ic->ic_stats.is_rx_dup++; 259 IEEE80211_NODE_STAT(ni, rx_dup); 260 goto out; 261 } 262 ni->ni_rxseqs[tid] = rxseq; 263 } 264 } 265 266 switch (type) { 267 case IEEE80211_FC0_TYPE_DATA: 268 hdrspace = ieee80211_hdrspace(ic, wh); 269 if (m->m_len < hdrspace && 270 (m = m_pullup(m, hdrspace)) == NULL) { 271 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 272 ni->ni_macaddr, NULL, 273 "data too short: expecting %u", hdrspace); 274 ic->ic_stats.is_rx_tooshort++; 275 goto out; /* XXX */ 276 } 277 switch (ic->ic_opmode) { 278 case IEEE80211_M_STA: 279 if (dir != IEEE80211_FC1_DIR_FROMDS) { 280 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 281 wh, "data", "unknown dir 0x%x", dir); 282 ic->ic_stats.is_rx_wrongdir++; 283 goto out; 284 } 285 if ((ifp->if_flags & IFF_SIMPLEX) && 286 IEEE80211_IS_MULTICAST(wh->i_addr1) && 287 IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_myaddr)) { 288 /* 289 * In IEEE802.11 network, multicast packet 290 * sent from me is broadcasted from AP. 291 * It should be silently discarded for 292 * SIMPLEX interface. 293 */ 294 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 295 wh, NULL, "%s", "multicast echo"); 296 ic->ic_stats.is_rx_mcastecho++; 297 goto out; 298 } 299 break; 300 case IEEE80211_M_IBSS: 301 case IEEE80211_M_AHDEMO: 302 if (dir != IEEE80211_FC1_DIR_NODS) { 303 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 304 wh, "data", "unknown dir 0x%x", dir); 305 ic->ic_stats.is_rx_wrongdir++; 306 goto out; 307 } 308 /* XXX no power-save support */ 309 break; 310 case IEEE80211_M_HOSTAP: 311 if (dir != IEEE80211_FC1_DIR_TODS) { 312 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 313 wh, "data", "unknown dir 0x%x", dir); 314 ic->ic_stats.is_rx_wrongdir++; 315 goto out; 316 } 317 /* check if source STA is associated */ 318 if (ni == ic->ic_bss) { 319 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 320 wh, "data", "%s", "unknown src"); 321 ieee80211_send_error(ic, ni, wh->i_addr2, 322 IEEE80211_FC0_SUBTYPE_DEAUTH, 323 IEEE80211_REASON_NOT_AUTHED); 324 ic->ic_stats.is_rx_notassoc++; 325 goto err; 326 } 327 if (ni->ni_associd == 0) { 328 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 329 wh, "data", "%s", "unassoc src"); 330 IEEE80211_SEND_MGMT(ic, ni, 331 IEEE80211_FC0_SUBTYPE_DISASSOC, 332 IEEE80211_REASON_NOT_ASSOCED); 333 ic->ic_stats.is_rx_notassoc++; 334 goto err; 335 } 336 337 /* 338 * Check for power save state change. 339 * XXX out-of-order A-MPDU frames? 340 */ 341 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 342 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 343 ieee80211_node_pwrsave(ni, 344 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 345 break; 346 default: 347 /* XXX here to keep compiler happy */ 348 goto out; 349 } 350 351 /* 352 * Handle A-MPDU re-ordering. The station must be 353 * associated and negotiated HT. The frame must be 354 * a QoS frame (not QoS null data) and not previously 355 * processed for A-MPDU re-ordering. If the frame is 356 * to be processed directly then ieee80211_ampdu_reorder 357 * will return 0; otherwise it has consumed the mbuf 358 * and we should do nothing more with it. 359 */ 360 if ((ni->ni_flags & IEEE80211_NODE_HT) && 361 subtype == IEEE80211_FC0_SUBTYPE_QOS && 362 ieee80211_ampdu_reorder(ni, m) != 0) { 363 m = NULL; 364 goto out; 365 } 366 resubmit_ampdu: 367 368 /* 369 * Handle privacy requirements. Note that we 370 * must not be preempted from here until after 371 * we (potentially) call ieee80211_crypto_demic; 372 * otherwise we may violate assumptions in the 373 * crypto cipher modules used to do delayed update 374 * of replay sequence numbers. 375 */ 376 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 377 if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { 378 /* 379 * Discard encrypted frames when privacy is off. 380 */ 381 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 382 wh, "WEP", "%s", "PRIVACY off"); 383 ic->ic_stats.is_rx_noprivacy++; 384 IEEE80211_NODE_STAT(ni, rx_noprivacy); 385 goto out; 386 } 387 key = ieee80211_crypto_decap(ic, ni, m, hdrspace); 388 if (key == NULL) { 389 /* NB: stats+msgs handled in crypto_decap */ 390 IEEE80211_NODE_STAT(ni, rx_wepfail); 391 goto out; 392 } 393 wh = mtod(m, struct ieee80211_frame *); 394 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 395 } else { 396 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 397 key = NULL; 398 } 399 400 /* 401 * Save QoS bits for use below--before we strip the header. 402 */ 403 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 404 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 405 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 406 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 407 } else 408 qos = 0; 409 410 /* 411 * Next up, any fragmentation. 412 */ 413 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 414 m = ieee80211_defrag(ic, ni, m, hdrspace); 415 if (m == NULL) { 416 /* Fragment dropped or frame not complete yet */ 417 goto out; 418 } 419 } 420 wh = NULL; /* no longer valid, catch any uses */ 421 422 /* 423 * Next strip any MSDU crypto bits. 424 */ 425 if (key != NULL && !ieee80211_crypto_demic(ic, key, m, 0)) { 426 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 427 ni->ni_macaddr, "data", "%s", "demic error"); 428 ic->ic_stats.is_rx_demicfail++; 429 IEEE80211_NODE_STAT(ni, rx_demicfail); 430 goto out; 431 } 432 433 /* copy to listener after decrypt */ 434 if (bpf_peers_present(ic->ic_rawbpf)) 435 bpf_mtap(ic->ic_rawbpf, m); 436 need_tap = 0; 437 438 /* 439 * Finally, strip the 802.11 header. 440 */ 441 m = ieee80211_decap(ic, m, hdrspace); 442 if (m == NULL) { 443 /* don't count Null data frames as errors */ 444 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 445 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 446 goto out; 447 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 448 ni->ni_macaddr, "data", "%s", "decap error"); 449 ic->ic_stats.is_rx_decap++; 450 IEEE80211_NODE_STAT(ni, rx_decap); 451 goto err; 452 } 453 eh = mtod(m, struct ether_header *); 454 if (!ieee80211_node_is_authorized(ni)) { 455 /* 456 * Deny any non-PAE frames received prior to 457 * authorization. For open/shared-key 458 * authentication the port is mark authorized 459 * after authentication completes. For 802.1x 460 * the port is not marked authorized by the 461 * authenticator until the handshake has completed. 462 */ 463 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 464 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 465 eh->ether_shost, "data", 466 "unauthorized port: ether type 0x%x len %u", 467 eh->ether_type, m->m_pkthdr.len); 468 ic->ic_stats.is_rx_unauth++; 469 IEEE80211_NODE_STAT(ni, rx_unauth); 470 goto err; 471 } 472 } else { 473 /* 474 * When denying unencrypted frames, discard 475 * any non-PAE frames received without encryption. 476 */ 477 if ((ic->ic_flags & IEEE80211_F_DROPUNENC) && 478 (key == NULL && (m->m_flags & M_WEP) == 0) && 479 eh->ether_type != htons(ETHERTYPE_PAE)) { 480 /* 481 * Drop unencrypted frames. 482 */ 483 ic->ic_stats.is_rx_unencrypted++; 484 IEEE80211_NODE_STAT(ni, rx_unencrypted); 485 goto out; 486 } 487 } 488 /* XXX require HT? */ 489 if (qos & IEEE80211_QOS_AMSDU) { 490 m = ieee80211_decap_amsdu(ni, m); 491 if (m == NULL) 492 return IEEE80211_FC0_TYPE_DATA; 493 } else if ((ni->ni_ath_flags & IEEE80211_NODE_FF) && 494 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 495 m->m_pkthdr.len >= 3*FF_LLC_SIZE) { 496 struct llc *llc; 497 498 /* 499 * Check for fast-frame tunnel encapsulation. 500 */ 501 if (m->m_len < FF_LLC_SIZE && 502 (m = m_pullup(m, FF_LLC_SIZE)) == NULL) { 503 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 504 ni->ni_macaddr, "fast-frame", 505 "%s", "m_pullup(llc) failed"); 506 ic->ic_stats.is_rx_tooshort++; 507 return IEEE80211_FC0_TYPE_DATA; 508 } 509 llc = (struct llc *)(mtod(m, uint8_t *) + 510 sizeof(struct ether_header)); 511 if (llc->llc_snap.ether_type == htons(ATH_FF_ETH_TYPE)) { 512 m_adj(m, FF_LLC_SIZE); 513 m = ieee80211_decap_fastframe(ic, ni, m); 514 if (m == NULL) 515 return IEEE80211_FC0_TYPE_DATA; 516 } 517 } 518 #undef FF_LLC_SIZE 519 ieee80211_deliver_data(ic, ni, m); 520 return IEEE80211_FC0_TYPE_DATA; 521 522 case IEEE80211_FC0_TYPE_MGT: 523 ic->ic_stats.is_rx_mgmt++; 524 IEEE80211_NODE_STAT(ni, rx_mgmt); 525 if (dir != IEEE80211_FC1_DIR_NODS) { 526 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 527 wh, "data", "unknown dir 0x%x", dir); 528 ic->ic_stats.is_rx_wrongdir++; 529 goto err; 530 } 531 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 532 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 533 ni->ni_macaddr, "mgt", "too short: len %u", 534 m->m_pkthdr.len); 535 ic->ic_stats.is_rx_tooshort++; 536 goto out; 537 } 538 #ifdef IEEE80211_DEBUG 539 if ((ieee80211_msg_debug(ic) && doprint(ic, subtype)) || 540 ieee80211_msg_dumppkts(ic)) { 541 if_printf(ic->ic_ifp, "received %s from %s rssi %d\n", 542 ieee80211_mgt_subtype_name[subtype >> 543 IEEE80211_FC0_SUBTYPE_SHIFT], 544 ether_sprintf(wh->i_addr2), rssi); 545 } 546 #endif 547 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 548 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 549 /* 550 * Only shared key auth frames with a challenge 551 * should be encrypted, discard all others. 552 */ 553 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 554 wh, ieee80211_mgt_subtype_name[subtype >> 555 IEEE80211_FC0_SUBTYPE_SHIFT], 556 "%s", "WEP set but not permitted"); 557 ic->ic_stats.is_rx_mgtdiscard++; /* XXX */ 558 goto out; 559 } 560 if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { 561 /* 562 * Discard encrypted frames when privacy is off. 563 */ 564 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 565 wh, "mgt", "%s", "WEP set but PRIVACY off"); 566 ic->ic_stats.is_rx_noprivacy++; 567 goto out; 568 } 569 hdrspace = ieee80211_hdrspace(ic, wh); 570 key = ieee80211_crypto_decap(ic, ni, m, hdrspace); 571 if (key == NULL) { 572 /* NB: stats+msgs handled in crypto_decap */ 573 goto out; 574 } 575 wh = mtod(m, struct ieee80211_frame *); 576 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 577 } 578 if (bpf_peers_present(ic->ic_rawbpf)) 579 bpf_mtap(ic->ic_rawbpf, m); 580 (*ic->ic_recv_mgmt)(ic, m, ni, subtype, rssi, noise, rstamp); 581 m_freem(m); 582 return IEEE80211_FC0_TYPE_MGT; 583 584 case IEEE80211_FC0_TYPE_CTL: 585 ic->ic_stats.is_rx_ctl++; 586 IEEE80211_NODE_STAT(ni, rx_ctrl); 587 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 588 switch (subtype) { 589 case IEEE80211_FC0_SUBTYPE_PS_POLL: 590 ieee80211_recv_pspoll(ic, ni, m); 591 break; 592 case IEEE80211_FC0_SUBTYPE_BAR: 593 ieee80211_recv_bar(ni, m); 594 break; 595 } 596 } 597 goto out; 598 default: 599 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 600 wh, NULL, "bad frame type 0x%x", type); 601 /* should not come here */ 602 break; 603 } 604 err: 605 ifp->if_ierrors++; 606 out: 607 if (m != NULL) { 608 if (bpf_peers_present(ic->ic_rawbpf) && need_tap) 609 bpf_mtap(ic->ic_rawbpf, m); 610 m_freem(m); 611 } 612 return type; 613 #undef SEQ_LEQ 614 } 615 616 /* 617 * This function reassemble fragments. 618 */ 619 static struct mbuf * 620 ieee80211_defrag(struct ieee80211com *ic, struct ieee80211_node *ni, 621 struct mbuf *m, int hdrspace) 622 { 623 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 624 struct ieee80211_frame *lwh; 625 uint16_t rxseq; 626 uint8_t fragno; 627 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 628 struct mbuf *mfrag; 629 630 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 631 632 rxseq = le16toh(*(uint16_t *)wh->i_seq); 633 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 634 635 /* Quick way out, if there's nothing to defragment */ 636 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 637 return m; 638 639 /* 640 * Remove frag to insure it doesn't get reaped by timer. 641 */ 642 if (ni->ni_table == NULL) { 643 /* 644 * Should never happen. If the node is orphaned (not in 645 * the table) then input packets should not reach here. 646 * Otherwise, a concurrent request that yanks the table 647 * should be blocked by other interlocking and/or by first 648 * shutting the driver down. Regardless, be defensive 649 * here and just bail 650 */ 651 /* XXX need msg+stat */ 652 m_freem(m); 653 return NULL; 654 } 655 IEEE80211_NODE_LOCK(ni->ni_table); 656 mfrag = ni->ni_rxfrag[0]; 657 ni->ni_rxfrag[0] = NULL; 658 IEEE80211_NODE_UNLOCK(ni->ni_table); 659 660 /* 661 * Validate new fragment is in order and 662 * related to the previous ones. 663 */ 664 if (mfrag != NULL) { 665 uint16_t last_rxseq; 666 667 lwh = mtod(mfrag, struct ieee80211_frame *); 668 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 669 /* NB: check seq # and frag together */ 670 if (rxseq != last_rxseq+1 || 671 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || 672 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 673 /* 674 * Unrelated fragment or no space for it, 675 * clear current fragments. 676 */ 677 m_freem(mfrag); 678 mfrag = NULL; 679 } 680 } 681 682 if (mfrag == NULL) { 683 if (fragno != 0) { /* !first fragment, discard */ 684 ic->ic_stats.is_rx_defrag++; 685 IEEE80211_NODE_STAT(ni, rx_defrag); 686 m_freem(m); 687 return NULL; 688 } 689 mfrag = m; 690 } else { /* concatenate */ 691 m_adj(m, hdrspace); /* strip header */ 692 m_cat(mfrag, m); 693 /* NB: m_cat doesn't update the packet header */ 694 mfrag->m_pkthdr.len += m->m_pkthdr.len; 695 /* track last seqnum and fragno */ 696 lwh = mtod(mfrag, struct ieee80211_frame *); 697 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 698 } 699 if (more_frag) { /* more to come, save */ 700 ni->ni_rxfragstamp = ticks; 701 ni->ni_rxfrag[0] = mfrag; 702 mfrag = NULL; 703 } 704 return mfrag; 705 } 706 707 void 708 ieee80211_deliver_data(struct ieee80211com *ic, 709 struct ieee80211_node *ni, struct mbuf *m) 710 { 711 struct ether_header *eh = mtod(m, struct ether_header *); 712 struct ifnet *ifp = ic->ic_ifp; 713 714 /* 715 * Do accounting. 716 */ 717 ifp->if_ipackets++; 718 IEEE80211_NODE_STAT(ni, rx_data); 719 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 720 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 721 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 722 IEEE80211_NODE_STAT(ni, rx_mcast); 723 } else 724 IEEE80211_NODE_STAT(ni, rx_ucast); 725 726 /* clear driver/net80211 flags before passing up */ 727 m->m_flags &= ~M_80211_RX; 728 729 /* perform as a bridge within the AP */ 730 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 731 (ic->ic_flags & IEEE80211_F_NOBRIDGE) == 0) { 732 struct mbuf *m1 = NULL; 733 734 if (m->m_flags & M_MCAST) { 735 m1 = m_dup(m, M_DONTWAIT); 736 if (m1 == NULL) 737 ifp->if_oerrors++; 738 else 739 m1->m_flags |= M_MCAST; 740 } else { 741 /* 742 * Check if the destination is known; if so 743 * and the port is authorized dispatch directly. 744 */ 745 struct ieee80211_node *sta = 746 ieee80211_find_node(&ic->ic_sta, eh->ether_dhost); 747 if (sta != NULL) { 748 if (ieee80211_node_is_authorized(sta)) { 749 /* 750 * Beware of sending to ourself; this 751 * needs to happen via the normal 752 * input path. 753 */ 754 if (sta != ic->ic_bss) { 755 m1 = m; 756 m = NULL; 757 } 758 } else { 759 ic->ic_stats.is_rx_unauth++; 760 IEEE80211_NODE_STAT(sta, rx_unauth); 761 } 762 ieee80211_free_node(sta); 763 } 764 } 765 if (m1 != NULL) { 766 int error; 767 768 /* XXX does not work well with WME */ 769 IFQ_HANDOFF(ifp, m1, error); 770 } 771 } 772 if (m != NULL) { 773 m->m_pkthdr.rcvif = ifp; 774 if (ni->ni_vlan != 0) { 775 /* attach vlan tag */ 776 m->m_pkthdr.ether_vtag = ni->ni_vlan; 777 m->m_flags |= M_VLANTAG; 778 } 779 (*ifp->if_input)(ifp, m); 780 } 781 } 782 783 static struct mbuf * 784 ieee80211_decap(struct ieee80211com *ic, struct mbuf *m, int hdrlen) 785 { 786 struct ieee80211_qosframe_addr4 wh; /* Max size address frames */ 787 struct ether_header *eh; 788 struct llc *llc; 789 790 if (m->m_len < hdrlen + sizeof(*llc) && 791 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 792 /* XXX stat, msg */ 793 return NULL; 794 } 795 memcpy(&wh, mtod(m, caddr_t), hdrlen); 796 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 797 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 798 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 799 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0) { 800 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 801 llc = NULL; 802 } else { 803 m_adj(m, hdrlen - sizeof(*eh)); 804 } 805 eh = mtod(m, struct ether_header *); 806 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 807 case IEEE80211_FC1_DIR_NODS: 808 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 809 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 810 break; 811 case IEEE80211_FC1_DIR_TODS: 812 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 813 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 814 break; 815 case IEEE80211_FC1_DIR_FROMDS: 816 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 817 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 818 break; 819 case IEEE80211_FC1_DIR_DSTODS: 820 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 821 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 822 break; 823 } 824 #ifdef ALIGNED_POINTER 825 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 826 struct mbuf *n, *n0, **np; 827 caddr_t newdata; 828 int off, pktlen; 829 830 n0 = NULL; 831 np = &n0; 832 off = 0; 833 pktlen = m->m_pkthdr.len; 834 while (pktlen > off) { 835 if (n0 == NULL) { 836 MGETHDR(n, M_DONTWAIT, MT_DATA); 837 if (n == NULL) { 838 m_freem(m); 839 return NULL; 840 } 841 M_MOVE_PKTHDR(n, m); 842 n->m_len = MHLEN; 843 } else { 844 MGET(n, M_DONTWAIT, MT_DATA); 845 if (n == NULL) { 846 m_freem(m); 847 m_freem(n0); 848 return NULL; 849 } 850 n->m_len = MLEN; 851 } 852 if (pktlen - off >= MINCLSIZE) { 853 MCLGET(n, M_DONTWAIT); 854 if (n->m_flags & M_EXT) 855 n->m_len = n->m_ext.ext_size; 856 } 857 if (n0 == NULL) { 858 newdata = 859 (caddr_t)ALIGN(n->m_data + sizeof(*eh)) - 860 sizeof(*eh); 861 n->m_len -= newdata - n->m_data; 862 n->m_data = newdata; 863 } 864 if (n->m_len > pktlen - off) 865 n->m_len = pktlen - off; 866 m_copydata(m, off, n->m_len, mtod(n, caddr_t)); 867 off += n->m_len; 868 *np = n; 869 np = &n->m_next; 870 } 871 m_freem(m); 872 m = n0; 873 } 874 #endif /* ALIGNED_POINTER */ 875 if (llc != NULL) { 876 eh = mtod(m, struct ether_header *); 877 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 878 } 879 return m; 880 } 881 882 /* 883 * Decap a frame encapsulated in a fast-frame/A-MSDU. 884 */ 885 struct mbuf * 886 ieee80211_decap1(struct mbuf *m, int *framelen) 887 { 888 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 889 struct ether_header *eh; 890 struct llc *llc; 891 892 /* 893 * The frame has an 802.3 header followed by an 802.2 894 * LLC header. The encapsulated frame length is in the 895 * first header type field; save that and overwrite it 896 * with the true type field found in the second. Then 897 * copy the 802.3 header up to where it belongs and 898 * adjust the mbuf contents to remove the void. 899 */ 900 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 901 return NULL; 902 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 903 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 904 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 905 + sizeof(struct ether_header) - sizeof(struct llc); 906 eh->ether_type = llc->llc_un.type_snap.ether_type; 907 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 908 sizeof(struct ether_header)); 909 m_adj(m, sizeof(struct llc)); 910 return m; 911 #undef FF_LLC_SIZE 912 } 913 914 /* 915 * Decap the encapsulated frame pair and dispatch the first 916 * for delivery. The second frame is returned for delivery 917 * via the normal path. 918 */ 919 static struct mbuf * 920 ieee80211_decap_fastframe(struct ieee80211com *ic, 921 struct ieee80211_node *ni, struct mbuf *m) 922 { 923 #define MS(x,f) (((x) & f) >> f##_S) 924 uint32_t ath; 925 struct mbuf *n; 926 int framelen; 927 928 m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath); 929 if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) { 930 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 931 ni->ni_macaddr, "fast-frame", 932 "unsupport tunnel protocol, header 0x%x", ath); 933 ic->ic_stats.is_ff_badhdr++; 934 m_freem(m); 935 return NULL; 936 } 937 /* NB: skip header and alignment padding */ 938 m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2); 939 940 ic->ic_stats.is_ff_decap++; 941 942 /* 943 * Decap the first frame, bust it apart from the 944 * second and deliver; then decap the second frame 945 * and return it to the caller for normal delivery. 946 */ 947 m = ieee80211_decap1(m, &framelen); 948 if (m == NULL) { 949 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 950 ni->ni_macaddr, "fast-frame", "%s", "first decap failed"); 951 ic->ic_stats.is_ff_tooshort++; 952 return NULL; 953 } 954 n = m_split(m, framelen, M_NOWAIT); 955 if (n == NULL) { 956 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 957 ni->ni_macaddr, "fast-frame", 958 "%s", "unable to split encapsulated frames"); 959 ic->ic_stats.is_ff_split++; 960 m_freem(m); /* NB: must reclaim */ 961 return NULL; 962 } 963 ieee80211_deliver_data(ic, ni, m); /* 1st of pair */ 964 965 /* 966 * Decap second frame. 967 */ 968 m_adj(n, roundup2(framelen, 4) - framelen); /* padding */ 969 n = ieee80211_decap1(n, &framelen); 970 if (n == NULL) { 971 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 972 ni->ni_macaddr, "fast-frame", "%s", "second decap failed"); 973 ic->ic_stats.is_ff_tooshort++; 974 } 975 /* XXX verify framelen against mbuf contents */ 976 return n; /* 2nd delivered by caller */ 977 #undef MS 978 } 979 980 /* 981 * Install received rate set information in the node's state block. 982 */ 983 int 984 ieee80211_setup_rates(struct ieee80211_node *ni, 985 const uint8_t *rates, const uint8_t *xrates, int flags) 986 { 987 struct ieee80211com *ic = ni->ni_ic; 988 struct ieee80211_rateset *rs = &ni->ni_rates; 989 990 memset(rs, 0, sizeof(*rs)); 991 rs->rs_nrates = rates[1]; 992 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 993 if (xrates != NULL) { 994 uint8_t nxrates; 995 /* 996 * Tack on 11g extended supported rate element. 997 */ 998 nxrates = xrates[1]; 999 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 1000 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 1001 IEEE80211_DPRINTF(ic, IEEE80211_MSG_XRATE, 1002 "[%s] extended rate set too large;" 1003 " only using %u of %u rates\n", 1004 ether_sprintf(ni->ni_macaddr), nxrates, xrates[1]); 1005 ic->ic_stats.is_rx_rstoobig++; 1006 } 1007 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 1008 rs->rs_nrates += nxrates; 1009 } 1010 return ieee80211_fix_rate(ni, rs, flags); 1011 } 1012 1013 static void 1014 ieee80211_auth_open(struct ieee80211com *ic, struct ieee80211_frame *wh, 1015 struct ieee80211_node *ni, int rssi, int noise, uint32_t rstamp, 1016 uint16_t seq, uint16_t status) 1017 { 1018 1019 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 1020 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1021 ni->ni_macaddr, "open auth", 1022 "bad sta auth mode %u", ni->ni_authmode); 1023 ic->ic_stats.is_rx_bad_auth++; /* XXX */ 1024 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 1025 /* 1026 * Clear any challenge text that may be there if 1027 * a previous shared key auth failed and then an 1028 * open auth is attempted. 1029 */ 1030 if (ni->ni_challenge != NULL) { 1031 FREE(ni->ni_challenge, M_80211_NODE); 1032 ni->ni_challenge = NULL; 1033 } 1034 /* XXX hack to workaround calling convention */ 1035 ieee80211_send_error(ic, ni, wh->i_addr2, 1036 IEEE80211_FC0_SUBTYPE_AUTH, 1037 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 1038 } 1039 return; 1040 } 1041 switch (ic->ic_opmode) { 1042 case IEEE80211_M_IBSS: 1043 case IEEE80211_M_AHDEMO: 1044 case IEEE80211_M_MONITOR: 1045 case IEEE80211_M_WDS: 1046 /* should not come here */ 1047 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1048 ni->ni_macaddr, "open auth", 1049 "bad operating mode %u", ic->ic_opmode); 1050 break; 1051 1052 case IEEE80211_M_HOSTAP: 1053 if (ic->ic_state != IEEE80211_S_RUN || 1054 seq != IEEE80211_AUTH_OPEN_REQUEST) { 1055 ic->ic_stats.is_rx_bad_auth++; 1056 return; 1057 } 1058 /* always accept open authentication requests */ 1059 if (ni == ic->ic_bss) { 1060 ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2); 1061 if (ni == NULL) 1062 return; 1063 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1064 (void) ieee80211_ref_node(ni); 1065 /* 1066 * Mark the node as referenced to reflect that it's 1067 * reference count has been bumped to insure it remains 1068 * after the transaction completes. 1069 */ 1070 ni->ni_flags |= IEEE80211_NODE_AREF; 1071 1072 IEEE80211_SEND_MGMT(ic, ni, 1073 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1074 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1075 "[%s] station authenticated (open)\n", 1076 ether_sprintf(ni->ni_macaddr)); 1077 /* 1078 * When 802.1x is not in use mark the port 1079 * authorized at this point so traffic can flow. 1080 */ 1081 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 1082 ieee80211_node_authorize(ni); 1083 break; 1084 1085 case IEEE80211_M_STA: 1086 if (ic->ic_state != IEEE80211_S_AUTH || 1087 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 1088 ic->ic_stats.is_rx_bad_auth++; 1089 return; 1090 } 1091 if (status != 0) { 1092 IEEE80211_DPRINTF(ic, 1093 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1094 "[%s] open auth failed (reason %d)\n", 1095 ether_sprintf(ni->ni_macaddr), status); 1096 /* XXX can this happen? */ 1097 if (ni != ic->ic_bss) 1098 ni->ni_fails++; 1099 ic->ic_stats.is_rx_auth_fail++; 1100 ieee80211_new_state(ic, IEEE80211_S_SCAN, 1101 IEEE80211_SCAN_FAIL_STATUS); 1102 } else 1103 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 0); 1104 break; 1105 } 1106 } 1107 1108 /* 1109 * Send a management frame error response to the specified 1110 * station. If ni is associated with the station then use 1111 * it; otherwise allocate a temporary node suitable for 1112 * transmitting the frame and then free the reference so 1113 * it will go away as soon as the frame has been transmitted. 1114 */ 1115 static void 1116 ieee80211_send_error(struct ieee80211com *ic, struct ieee80211_node *ni, 1117 const uint8_t *mac, int subtype, int arg) 1118 { 1119 int istmp; 1120 1121 if (ni == ic->ic_bss) { 1122 ni = ieee80211_tmp_node(ic, mac); 1123 if (ni == NULL) { 1124 /* XXX msg */ 1125 return; 1126 } 1127 istmp = 1; 1128 } else 1129 istmp = 0; 1130 IEEE80211_SEND_MGMT(ic, ni, subtype, arg); 1131 if (istmp) 1132 ieee80211_free_node(ni); 1133 } 1134 1135 static int 1136 alloc_challenge(struct ieee80211com *ic, struct ieee80211_node *ni) 1137 { 1138 if (ni->ni_challenge == NULL) 1139 MALLOC(ni->ni_challenge, uint32_t*, IEEE80211_CHALLENGE_LEN, 1140 M_80211_NODE, M_NOWAIT); 1141 if (ni->ni_challenge == NULL) { 1142 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1143 "[%s] shared key challenge alloc failed\n", 1144 ether_sprintf(ni->ni_macaddr)); 1145 /* XXX statistic */ 1146 } 1147 return (ni->ni_challenge != NULL); 1148 } 1149 1150 /* XXX TODO: add statistics */ 1151 static void 1152 ieee80211_auth_shared(struct ieee80211com *ic, struct ieee80211_frame *wh, 1153 uint8_t *frm, uint8_t *efrm, struct ieee80211_node *ni, 1154 int rssi, int noise, uint32_t rstamp, uint16_t seq, uint16_t status) 1155 { 1156 uint8_t *challenge; 1157 int allocbs, estatus; 1158 1159 /* 1160 * NB: this can happen as we allow pre-shared key 1161 * authentication to be enabled w/o wep being turned 1162 * on so that configuration of these can be done 1163 * in any order. It may be better to enforce the 1164 * ordering in which case this check would just be 1165 * for sanity/consistency. 1166 */ 1167 if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { 1168 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1169 ni->ni_macaddr, "shared key auth", 1170 "%s", " PRIVACY is disabled"); 1171 estatus = IEEE80211_STATUS_ALG; 1172 goto bad; 1173 } 1174 /* 1175 * Pre-shared key authentication is evil; accept 1176 * it only if explicitly configured (it is supported 1177 * mainly for compatibility with clients like OS X). 1178 */ 1179 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1180 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1181 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1182 ni->ni_macaddr, "shared key auth", 1183 "bad sta auth mode %u", ni->ni_authmode); 1184 ic->ic_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1185 estatus = IEEE80211_STATUS_ALG; 1186 goto bad; 1187 } 1188 1189 challenge = NULL; 1190 if (frm + 1 < efrm) { 1191 if ((frm[1] + 2) > (efrm - frm)) { 1192 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1193 ni->ni_macaddr, "shared key auth", 1194 "ie %d/%d too long", 1195 frm[0], (frm[1] + 2) - (efrm - frm)); 1196 ic->ic_stats.is_rx_bad_auth++; 1197 estatus = IEEE80211_STATUS_CHALLENGE; 1198 goto bad; 1199 } 1200 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1201 challenge = frm; 1202 frm += frm[1] + 2; 1203 } 1204 switch (seq) { 1205 case IEEE80211_AUTH_SHARED_CHALLENGE: 1206 case IEEE80211_AUTH_SHARED_RESPONSE: 1207 if (challenge == NULL) { 1208 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1209 ni->ni_macaddr, "shared key auth", 1210 "%s", "no challenge"); 1211 ic->ic_stats.is_rx_bad_auth++; 1212 estatus = IEEE80211_STATUS_CHALLENGE; 1213 goto bad; 1214 } 1215 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1216 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1217 ni->ni_macaddr, "shared key auth", 1218 "bad challenge len %d", challenge[1]); 1219 ic->ic_stats.is_rx_bad_auth++; 1220 estatus = IEEE80211_STATUS_CHALLENGE; 1221 goto bad; 1222 } 1223 default: 1224 break; 1225 } 1226 switch (ic->ic_opmode) { 1227 case IEEE80211_M_MONITOR: 1228 case IEEE80211_M_AHDEMO: 1229 case IEEE80211_M_IBSS: 1230 case IEEE80211_M_WDS: 1231 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1232 ni->ni_macaddr, "shared key auth", 1233 "bad operating mode %u", ic->ic_opmode); 1234 return; 1235 case IEEE80211_M_HOSTAP: 1236 if (ic->ic_state != IEEE80211_S_RUN) { 1237 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1238 ni->ni_macaddr, "shared key auth", 1239 "bad state %u", ic->ic_state); 1240 estatus = IEEE80211_STATUS_ALG; /* XXX */ 1241 goto bad; 1242 } 1243 switch (seq) { 1244 case IEEE80211_AUTH_SHARED_REQUEST: 1245 if (ni == ic->ic_bss) { 1246 ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2); 1247 if (ni == NULL) { 1248 /* NB: no way to return an error */ 1249 return; 1250 } 1251 allocbs = 1; 1252 } else { 1253 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1254 (void) ieee80211_ref_node(ni); 1255 allocbs = 0; 1256 } 1257 /* 1258 * Mark the node as referenced to reflect that it's 1259 * reference count has been bumped to insure it remains 1260 * after the transaction completes. 1261 */ 1262 ni->ni_flags |= IEEE80211_NODE_AREF; 1263 ni->ni_rssi = rssi; 1264 ni->ni_noise = noise; 1265 ni->ni_rstamp = rstamp; 1266 if (!alloc_challenge(ic, ni)) { 1267 /* NB: don't return error so they rexmit */ 1268 return; 1269 } 1270 get_random_bytes(ni->ni_challenge, 1271 IEEE80211_CHALLENGE_LEN); 1272 IEEE80211_DPRINTF(ic, 1273 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1274 "[%s] shared key %sauth request\n", 1275 ether_sprintf(ni->ni_macaddr), 1276 allocbs ? "" : "re"); 1277 break; 1278 case IEEE80211_AUTH_SHARED_RESPONSE: 1279 if (ni == ic->ic_bss) { 1280 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1281 ni->ni_macaddr, "shared key response", 1282 "%s", "unknown station"); 1283 /* NB: don't send a response */ 1284 return; 1285 } 1286 if (ni->ni_challenge == NULL) { 1287 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1288 ni->ni_macaddr, "shared key response", 1289 "%s", "no challenge recorded"); 1290 ic->ic_stats.is_rx_bad_auth++; 1291 estatus = IEEE80211_STATUS_CHALLENGE; 1292 goto bad; 1293 } 1294 if (memcmp(ni->ni_challenge, &challenge[2], 1295 challenge[1]) != 0) { 1296 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1297 ni->ni_macaddr, "shared key response", 1298 "%s", "challenge mismatch"); 1299 ic->ic_stats.is_rx_auth_fail++; 1300 estatus = IEEE80211_STATUS_CHALLENGE; 1301 goto bad; 1302 } 1303 IEEE80211_DPRINTF(ic, 1304 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1305 "[%s] station authenticated (shared key)\n", 1306 ether_sprintf(ni->ni_macaddr)); 1307 ieee80211_node_authorize(ni); 1308 break; 1309 default: 1310 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1311 ni->ni_macaddr, "shared key auth", 1312 "bad seq %d", seq); 1313 ic->ic_stats.is_rx_bad_auth++; 1314 estatus = IEEE80211_STATUS_SEQUENCE; 1315 goto bad; 1316 } 1317 IEEE80211_SEND_MGMT(ic, ni, 1318 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1319 break; 1320 1321 case IEEE80211_M_STA: 1322 if (ic->ic_state != IEEE80211_S_AUTH) 1323 return; 1324 switch (seq) { 1325 case IEEE80211_AUTH_SHARED_PASS: 1326 if (ni->ni_challenge != NULL) { 1327 FREE(ni->ni_challenge, M_80211_NODE); 1328 ni->ni_challenge = NULL; 1329 } 1330 if (status != 0) { 1331 IEEE80211_DPRINTF(ic, 1332 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1333 "[%s] shared key auth failed (reason %d)\n", 1334 ether_sprintf(ieee80211_getbssid(ic, wh)), 1335 status); 1336 /* XXX can this happen? */ 1337 if (ni != ic->ic_bss) 1338 ni->ni_fails++; 1339 ic->ic_stats.is_rx_auth_fail++; 1340 return; 1341 } 1342 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 0); 1343 break; 1344 case IEEE80211_AUTH_SHARED_CHALLENGE: 1345 if (!alloc_challenge(ic, ni)) 1346 return; 1347 /* XXX could optimize by passing recvd challenge */ 1348 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1349 IEEE80211_SEND_MGMT(ic, ni, 1350 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1351 break; 1352 default: 1353 IEEE80211_DISCARD(ic, IEEE80211_MSG_AUTH, 1354 wh, "shared key auth", "bad seq %d", seq); 1355 ic->ic_stats.is_rx_bad_auth++; 1356 return; 1357 } 1358 break; 1359 } 1360 return; 1361 bad: 1362 /* 1363 * Send an error response; but only when operating as an AP. 1364 */ 1365 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 1366 /* XXX hack to workaround calling convention */ 1367 ieee80211_send_error(ic, ni, wh->i_addr2, 1368 IEEE80211_FC0_SUBTYPE_AUTH, 1369 (seq + 1) | (estatus<<16)); 1370 } else if (ic->ic_opmode == IEEE80211_M_STA) { 1371 /* 1372 * Kick the state machine. This short-circuits 1373 * using the mgt frame timeout to trigger the 1374 * state transition. 1375 */ 1376 if (ic->ic_state == IEEE80211_S_AUTH) 1377 ieee80211_new_state(ic, IEEE80211_S_SCAN, 1378 IEEE80211_SCAN_FAIL_STATUS); 1379 } 1380 } 1381 1382 /* Verify the existence and length of __elem or get out. */ 1383 #define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen) do { \ 1384 if ((__elem) == NULL) { \ 1385 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ 1386 wh, ieee80211_mgt_subtype_name[subtype >> \ 1387 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1388 "%s", "no " #__elem ); \ 1389 ic->ic_stats.is_rx_elem_missing++; \ 1390 return; \ 1391 } \ 1392 if ((__elem)[1] > (__maxlen)) { \ 1393 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ 1394 wh, ieee80211_mgt_subtype_name[subtype >> \ 1395 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1396 "bad " #__elem " len %d", (__elem)[1]); \ 1397 ic->ic_stats.is_rx_elem_toobig++; \ 1398 return; \ 1399 } \ 1400 } while (0) 1401 1402 #define IEEE80211_VERIFY_LENGTH(_len, _minlen, _action) do { \ 1403 if ((_len) < (_minlen)) { \ 1404 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ 1405 wh, ieee80211_mgt_subtype_name[subtype >> \ 1406 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1407 "ie too short, got %d, expected %d", \ 1408 (_len), (_minlen)); \ 1409 ic->ic_stats.is_rx_elem_toosmall++; \ 1410 _action; \ 1411 } \ 1412 } while (0) 1413 1414 #ifdef IEEE80211_DEBUG 1415 static void 1416 ieee80211_ssid_mismatch(struct ieee80211com *ic, const char *tag, 1417 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 1418 { 1419 printf("[%s] discard %s frame, ssid mismatch: ", 1420 ether_sprintf(mac), tag); 1421 ieee80211_print_essid(ssid + 2, ssid[1]); 1422 printf("\n"); 1423 } 1424 1425 #define IEEE80211_VERIFY_SSID(_ni, _ssid) do { \ 1426 if ((_ssid)[1] != 0 && \ 1427 ((_ssid)[1] != (_ni)->ni_esslen || \ 1428 memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \ 1429 if (ieee80211_msg_input(ic)) \ 1430 ieee80211_ssid_mismatch(ic, \ 1431 ieee80211_mgt_subtype_name[subtype >> \ 1432 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1433 wh->i_addr2, _ssid); \ 1434 ic->ic_stats.is_rx_ssidmismatch++; \ 1435 return; \ 1436 } \ 1437 } while (0) 1438 #else /* !IEEE80211_DEBUG */ 1439 #define IEEE80211_VERIFY_SSID(_ni, _ssid) do { \ 1440 if ((_ssid)[1] != 0 && \ 1441 ((_ssid)[1] != (_ni)->ni_esslen || \ 1442 memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \ 1443 ic->ic_stats.is_rx_ssidmismatch++; \ 1444 return; \ 1445 } \ 1446 } while (0) 1447 #endif /* !IEEE80211_DEBUG */ 1448 1449 /* unalligned little endian access */ 1450 #define LE_READ_2(p) \ 1451 ((uint16_t) \ 1452 ((((const uint8_t *)(p))[0] ) | \ 1453 (((const uint8_t *)(p))[1] << 8))) 1454 #define LE_READ_4(p) \ 1455 ((uint32_t) \ 1456 ((((const uint8_t *)(p))[0] ) | \ 1457 (((const uint8_t *)(p))[1] << 8) | \ 1458 (((const uint8_t *)(p))[2] << 16) | \ 1459 (((const uint8_t *)(p))[3] << 24))) 1460 1461 static __inline int 1462 iswpaoui(const uint8_t *frm) 1463 { 1464 return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI); 1465 } 1466 1467 static __inline int 1468 iswmeoui(const uint8_t *frm) 1469 { 1470 return frm[1] > 3 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI); 1471 } 1472 1473 static __inline int 1474 iswmeparam(const uint8_t *frm) 1475 { 1476 return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) && 1477 frm[6] == WME_PARAM_OUI_SUBTYPE; 1478 } 1479 1480 static __inline int 1481 iswmeinfo(const uint8_t *frm) 1482 { 1483 return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) && 1484 frm[6] == WME_INFO_OUI_SUBTYPE; 1485 } 1486 1487 static __inline int 1488 isatherosoui(const uint8_t *frm) 1489 { 1490 return frm[1] > 3 && LE_READ_4(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI); 1491 } 1492 1493 static __inline int 1494 ishtcapoui(const uint8_t *frm) 1495 { 1496 return frm[1] > 3 && LE_READ_4(frm+2) == ((BCM_OUI_HTCAP<<24)|BCM_OUI); 1497 } 1498 1499 static __inline int 1500 ishtinfooui(const uint8_t *frm) 1501 { 1502 return frm[1] > 3 && LE_READ_4(frm+2) == ((BCM_OUI_HTINFO<<24)|BCM_OUI); 1503 } 1504 1505 /* 1506 * Convert a WPA cipher selector OUI to an internal 1507 * cipher algorithm. Where appropriate we also 1508 * record any key length. 1509 */ 1510 static int 1511 wpa_cipher(uint8_t *sel, uint8_t *keylen) 1512 { 1513 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1514 uint32_t w = LE_READ_4(sel); 1515 1516 switch (w) { 1517 case WPA_SEL(WPA_CSE_NULL): 1518 return IEEE80211_CIPHER_NONE; 1519 case WPA_SEL(WPA_CSE_WEP40): 1520 if (keylen) 1521 *keylen = 40 / NBBY; 1522 return IEEE80211_CIPHER_WEP; 1523 case WPA_SEL(WPA_CSE_WEP104): 1524 if (keylen) 1525 *keylen = 104 / NBBY; 1526 return IEEE80211_CIPHER_WEP; 1527 case WPA_SEL(WPA_CSE_TKIP): 1528 return IEEE80211_CIPHER_TKIP; 1529 case WPA_SEL(WPA_CSE_CCMP): 1530 return IEEE80211_CIPHER_AES_CCM; 1531 } 1532 return 32; /* NB: so 1<< is discarded */ 1533 #undef WPA_SEL 1534 } 1535 1536 /* 1537 * Convert a WPA key management/authentication algorithm 1538 * to an internal code. 1539 */ 1540 static int 1541 wpa_keymgmt(uint8_t *sel) 1542 { 1543 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1544 uint32_t w = LE_READ_4(sel); 1545 1546 switch (w) { 1547 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1548 return WPA_ASE_8021X_UNSPEC; 1549 case WPA_SEL(WPA_ASE_8021X_PSK): 1550 return WPA_ASE_8021X_PSK; 1551 case WPA_SEL(WPA_ASE_NONE): 1552 return WPA_ASE_NONE; 1553 } 1554 return 0; /* NB: so is discarded */ 1555 #undef WPA_SEL 1556 } 1557 1558 /* 1559 * Parse a WPA information element to collect parameters 1560 * and validate the parameters against what has been 1561 * configured for the system. 1562 */ 1563 static int 1564 ieee80211_parse_wpa(struct ieee80211com *ic, uint8_t *frm, 1565 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1566 { 1567 uint8_t len = frm[1]; 1568 uint32_t w; 1569 int n; 1570 1571 /* 1572 * Check the length once for fixed parts: OUI, type, 1573 * version, mcast cipher, and 2 selector counts. 1574 * Other, variable-length data, must be checked separately. 1575 */ 1576 if ((ic->ic_flags & IEEE80211_F_WPA1) == 0) { 1577 IEEE80211_DISCARD_IE(ic, 1578 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1579 wh, "WPA", "not WPA, flags 0x%x", ic->ic_flags); 1580 return IEEE80211_REASON_IE_INVALID; 1581 } 1582 if (len < 14) { 1583 IEEE80211_DISCARD_IE(ic, 1584 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1585 wh, "WPA", "too short, len %u", len); 1586 return IEEE80211_REASON_IE_INVALID; 1587 } 1588 frm += 6, len -= 4; /* NB: len is payload only */ 1589 /* NB: iswapoui already validated the OUI and type */ 1590 w = LE_READ_2(frm); 1591 if (w != WPA_VERSION) { 1592 IEEE80211_DISCARD_IE(ic, 1593 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1594 wh, "WPA", "bad version %u", w); 1595 return IEEE80211_REASON_IE_INVALID; 1596 } 1597 frm += 2, len -= 2; 1598 1599 /* multicast/group cipher */ 1600 w = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1601 if (w != rsn->rsn_mcastcipher) { 1602 IEEE80211_DISCARD_IE(ic, 1603 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1604 wh, "WPA", "mcast cipher mismatch; got %u, expected %u", 1605 w, rsn->rsn_mcastcipher); 1606 return IEEE80211_REASON_IE_INVALID; 1607 } 1608 frm += 4, len -= 4; 1609 1610 /* unicast ciphers */ 1611 n = LE_READ_2(frm); 1612 frm += 2, len -= 2; 1613 if (len < n*4+2) { 1614 IEEE80211_DISCARD_IE(ic, 1615 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1616 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1617 len, n); 1618 return IEEE80211_REASON_IE_INVALID; 1619 } 1620 w = 0; 1621 for (; n > 0; n--) { 1622 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1623 frm += 4, len -= 4; 1624 } 1625 w &= rsn->rsn_ucastcipherset; 1626 if (w == 0) { 1627 IEEE80211_DISCARD_IE(ic, 1628 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1629 wh, "WPA", "%s", "ucast cipher set empty"); 1630 return IEEE80211_REASON_IE_INVALID; 1631 } 1632 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1633 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1634 else 1635 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1636 1637 /* key management algorithms */ 1638 n = LE_READ_2(frm); 1639 frm += 2, len -= 2; 1640 if (len < n*4) { 1641 IEEE80211_DISCARD_IE(ic, 1642 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1643 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1644 len, n); 1645 return IEEE80211_REASON_IE_INVALID; 1646 } 1647 w = 0; 1648 for (; n > 0; n--) { 1649 w |= wpa_keymgmt(frm); 1650 frm += 4, len -= 4; 1651 } 1652 w &= rsn->rsn_keymgmtset; 1653 if (w == 0) { 1654 IEEE80211_DISCARD_IE(ic, 1655 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1656 wh, "WPA", "%s", "no acceptable key mgmt alg"); 1657 return IEEE80211_REASON_IE_INVALID; 1658 } 1659 if (w & WPA_ASE_8021X_UNSPEC) 1660 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1661 else 1662 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1663 1664 if (len > 2) /* optional capabilities */ 1665 rsn->rsn_caps = LE_READ_2(frm); 1666 1667 return 0; 1668 } 1669 1670 /* 1671 * Convert an RSN cipher selector OUI to an internal 1672 * cipher algorithm. Where appropriate we also 1673 * record any key length. 1674 */ 1675 static int 1676 rsn_cipher(uint8_t *sel, uint8_t *keylen) 1677 { 1678 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1679 uint32_t w = LE_READ_4(sel); 1680 1681 switch (w) { 1682 case RSN_SEL(RSN_CSE_NULL): 1683 return IEEE80211_CIPHER_NONE; 1684 case RSN_SEL(RSN_CSE_WEP40): 1685 if (keylen) 1686 *keylen = 40 / NBBY; 1687 return IEEE80211_CIPHER_WEP; 1688 case RSN_SEL(RSN_CSE_WEP104): 1689 if (keylen) 1690 *keylen = 104 / NBBY; 1691 return IEEE80211_CIPHER_WEP; 1692 case RSN_SEL(RSN_CSE_TKIP): 1693 return IEEE80211_CIPHER_TKIP; 1694 case RSN_SEL(RSN_CSE_CCMP): 1695 return IEEE80211_CIPHER_AES_CCM; 1696 case RSN_SEL(RSN_CSE_WRAP): 1697 return IEEE80211_CIPHER_AES_OCB; 1698 } 1699 return 32; /* NB: so 1<< is discarded */ 1700 #undef WPA_SEL 1701 } 1702 1703 /* 1704 * Convert an RSN key management/authentication algorithm 1705 * to an internal code. 1706 */ 1707 static int 1708 rsn_keymgmt(uint8_t *sel) 1709 { 1710 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1711 uint32_t w = LE_READ_4(sel); 1712 1713 switch (w) { 1714 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1715 return RSN_ASE_8021X_UNSPEC; 1716 case RSN_SEL(RSN_ASE_8021X_PSK): 1717 return RSN_ASE_8021X_PSK; 1718 case RSN_SEL(RSN_ASE_NONE): 1719 return RSN_ASE_NONE; 1720 } 1721 return 0; /* NB: so is discarded */ 1722 #undef RSN_SEL 1723 } 1724 1725 /* 1726 * Parse a WPA/RSN information element to collect parameters 1727 * and validate the parameters against what has been 1728 * configured for the system. 1729 */ 1730 static int 1731 ieee80211_parse_rsn(struct ieee80211com *ic, uint8_t *frm, 1732 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1733 { 1734 uint8_t len = frm[1]; 1735 uint32_t w; 1736 int n; 1737 1738 /* 1739 * Check the length once for fixed parts: 1740 * version, mcast cipher, and 2 selector counts. 1741 * Other, variable-length data, must be checked separately. 1742 */ 1743 if ((ic->ic_flags & IEEE80211_F_WPA2) == 0) { 1744 IEEE80211_DISCARD_IE(ic, 1745 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1746 wh, "WPA", "not RSN, flags 0x%x", ic->ic_flags); 1747 return IEEE80211_REASON_IE_INVALID; 1748 } 1749 if (len < 10) { 1750 IEEE80211_DISCARD_IE(ic, 1751 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1752 wh, "RSN", "too short, len %u", len); 1753 return IEEE80211_REASON_IE_INVALID; 1754 } 1755 frm += 2; 1756 w = LE_READ_2(frm); 1757 if (w != RSN_VERSION) { 1758 IEEE80211_DISCARD_IE(ic, 1759 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1760 wh, "RSN", "bad version %u", w); 1761 return IEEE80211_REASON_IE_INVALID; 1762 } 1763 frm += 2, len -= 2; 1764 1765 /* multicast/group cipher */ 1766 w = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1767 if (w != rsn->rsn_mcastcipher) { 1768 IEEE80211_DISCARD_IE(ic, 1769 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1770 wh, "RSN", "mcast cipher mismatch; got %u, expected %u", 1771 w, rsn->rsn_mcastcipher); 1772 return IEEE80211_REASON_IE_INVALID; 1773 } 1774 frm += 4, len -= 4; 1775 1776 /* unicast ciphers */ 1777 n = LE_READ_2(frm); 1778 frm += 2, len -= 2; 1779 if (len < n*4+2) { 1780 IEEE80211_DISCARD_IE(ic, 1781 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1782 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1783 len, n); 1784 return IEEE80211_REASON_IE_INVALID; 1785 } 1786 w = 0; 1787 for (; n > 0; n--) { 1788 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1789 frm += 4, len -= 4; 1790 } 1791 w &= rsn->rsn_ucastcipherset; 1792 if (w == 0) { 1793 IEEE80211_DISCARD_IE(ic, 1794 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1795 wh, "RSN", "%s", "ucast cipher set empty"); 1796 return IEEE80211_REASON_IE_INVALID; 1797 } 1798 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1799 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1800 else 1801 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1802 1803 /* key management algorithms */ 1804 n = LE_READ_2(frm); 1805 frm += 2, len -= 2; 1806 if (len < n*4) { 1807 IEEE80211_DISCARD_IE(ic, 1808 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1809 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1810 len, n); 1811 return IEEE80211_REASON_IE_INVALID; 1812 } 1813 w = 0; 1814 for (; n > 0; n--) { 1815 w |= rsn_keymgmt(frm); 1816 frm += 4, len -= 4; 1817 } 1818 w &= rsn->rsn_keymgmtset; 1819 if (w == 0) { 1820 IEEE80211_DISCARD_IE(ic, 1821 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1822 wh, "RSN", "%s", "no acceptable key mgmt alg"); 1823 return IEEE80211_REASON_IE_INVALID; 1824 } 1825 if (w & RSN_ASE_8021X_UNSPEC) 1826 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1827 else 1828 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1829 1830 /* optional RSN capabilities */ 1831 if (len > 2) 1832 rsn->rsn_caps = LE_READ_2(frm); 1833 /* XXXPMKID */ 1834 1835 return 0; 1836 } 1837 1838 static int 1839 ieee80211_parse_wmeparams(struct ieee80211com *ic, uint8_t *frm, 1840 const struct ieee80211_frame *wh) 1841 { 1842 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1843 struct ieee80211_wme_state *wme = &ic->ic_wme; 1844 u_int len = frm[1], qosinfo; 1845 int i; 1846 1847 if (len < sizeof(struct ieee80211_wme_param)-2) { 1848 IEEE80211_DISCARD_IE(ic, 1849 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1850 wh, "WME", "too short, len %u", len); 1851 return -1; 1852 } 1853 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1854 qosinfo &= WME_QOSINFO_COUNT; 1855 /* XXX do proper check for wraparound */ 1856 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1857 return 0; 1858 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1859 for (i = 0; i < WME_NUM_AC; i++) { 1860 struct wmeParams *wmep = 1861 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1862 /* NB: ACI not used */ 1863 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1864 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1865 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1866 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1867 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1868 frm += 4; 1869 } 1870 wme->wme_wmeChanParams.cap_info = qosinfo; 1871 return 1; 1872 #undef MS 1873 } 1874 1875 static int 1876 ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm, 1877 const struct ieee80211_frame *wh) 1878 { 1879 struct ieee80211com *ic = ni->ni_ic; 1880 const struct ieee80211_ath_ie *ath; 1881 u_int len = frm[1]; 1882 int capschanged; 1883 uint16_t defkeyix; 1884 1885 if (len < sizeof(struct ieee80211_ath_ie)-2) { 1886 IEEE80211_DISCARD_IE(ic, 1887 IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG, 1888 wh, "Atheros", "too short, len %u", len); 1889 return -1; 1890 } 1891 ath = (const struct ieee80211_ath_ie *)frm; 1892 capschanged = (ni->ni_ath_flags != ath->ath_capability); 1893 defkeyix = LE_READ_2(ath->ath_defkeyix); 1894 if (capschanged || defkeyix != ni->ni_ath_defkeyix) { 1895 ni->ni_ath_flags = ath->ath_capability; 1896 ni->ni_ath_defkeyix = defkeyix; 1897 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SUPERG, 1898 "[%s] ath ie change: new caps 0x%x defkeyix 0x%x\n", 1899 ether_sprintf(ni->ni_macaddr), 1900 ni->ni_ath_flags, ni->ni_ath_defkeyix); 1901 } 1902 if (IEEE80211_ATH_CAP(ic, ni, ATHEROS_CAP_TURBO_PRIME)) { 1903 uint16_t curflags, newflags; 1904 1905 /* 1906 * Check for turbo mode switch. Calculate flags 1907 * for the new mode and effect the switch. 1908 */ 1909 newflags = curflags = ic->ic_bsschan->ic_flags; 1910 /* NB: BOOST is not in ic_flags, so get it from the ie */ 1911 if (ath->ath_capability & ATHEROS_CAP_BOOST) 1912 newflags |= IEEE80211_CHAN_TURBO; 1913 else 1914 newflags &= ~IEEE80211_CHAN_TURBO; 1915 if (newflags != curflags) 1916 ieee80211_dturbo_switch(ic, newflags); 1917 } 1918 return capschanged; 1919 } 1920 1921 void 1922 ieee80211_saveath(struct ieee80211_node *ni, uint8_t *ie) 1923 { 1924 const struct ieee80211_ath_ie *ath = 1925 (const struct ieee80211_ath_ie *) ie; 1926 1927 ni->ni_ath_flags = ath->ath_capability; 1928 ni->ni_ath_defkeyix = LE_READ_2(&ath->ath_defkeyix); 1929 ieee80211_saveie(&ni->ni_ath_ie, ie); 1930 } 1931 1932 void 1933 ieee80211_saveie(uint8_t **iep, const uint8_t *ie) 1934 { 1935 u_int ielen = ie[1]+2; 1936 /* 1937 * Record information element for later use. 1938 */ 1939 if (*iep == NULL || (*iep)[1] != ie[1]) { 1940 if (*iep != NULL) 1941 FREE(*iep, M_80211_NODE); 1942 MALLOC(*iep, void*, ielen, M_80211_NODE, M_NOWAIT); 1943 } 1944 if (*iep != NULL) 1945 memcpy(*iep, ie, ielen); 1946 /* XXX note failure */ 1947 } 1948 1949 /* XXX find a better place for definition */ 1950 struct l2_update_frame { 1951 struct ether_header eh; 1952 uint8_t dsap; 1953 uint8_t ssap; 1954 uint8_t control; 1955 uint8_t xid[3]; 1956 } __packed; 1957 1958 /* 1959 * Deliver a TGf L2UF frame on behalf of a station. 1960 * This primes any bridge when the station is roaming 1961 * between ap's on the same wired network. 1962 */ 1963 static void 1964 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1965 { 1966 struct ieee80211com *ic = ni->ni_ic; 1967 struct ifnet *ifp = ic->ic_ifp; 1968 struct mbuf *m; 1969 struct l2_update_frame *l2uf; 1970 struct ether_header *eh; 1971 1972 m = m_gethdr(M_NOWAIT, MT_DATA); 1973 if (m == NULL) { 1974 IEEE80211_NOTE(ic, IEEE80211_MSG_ASSOC, ni, 1975 "%s", "no mbuf for l2uf frame"); 1976 ic->ic_stats.is_rx_nobuf++; /* XXX not right */ 1977 return; 1978 } 1979 l2uf = mtod(m, struct l2_update_frame *); 1980 eh = &l2uf->eh; 1981 /* dst: Broadcast address */ 1982 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1983 /* src: associated STA */ 1984 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1985 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1986 1987 l2uf->dsap = 0; 1988 l2uf->ssap = 0; 1989 l2uf->control = 0xf5; 1990 l2uf->xid[0] = 0x81; 1991 l2uf->xid[1] = 0x80; 1992 l2uf->xid[2] = 0x00; 1993 1994 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1995 ieee80211_deliver_data(ic, ni, m); 1996 } 1997 1998 static __inline int 1999 contbgscan(struct ieee80211com *ic) 2000 { 2001 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 2002 time_after(ticks, ic->ic_lastdata + ic->ic_bgscanidle)); 2003 } 2004 2005 static __inline int 2006 startbgscan(struct ieee80211com *ic) 2007 { 2008 return ((ic->ic_flags & IEEE80211_F_BGSCAN) && 2009 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 2010 time_after(ticks, ic->ic_lastscan + ic->ic_bgscanintvl) && 2011 time_after(ticks, ic->ic_lastdata + ic->ic_bgscanidle)); 2012 } 2013 2014 static void 2015 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 2016 int reassoc, int resp, const char *tag, int rate) 2017 { 2018 struct ieee80211com *ic = ni->ni_ic; 2019 2020 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 2021 "[%s] deny %s request, %s rate set mismatch, rate 0x%x\n", 2022 ether_sprintf(wh->i_addr2), 2023 reassoc ? "reassoc" : "assoc", tag, rate); 2024 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_BASIC_RATE); 2025 ieee80211_node_leave(ic, ni); 2026 ic->ic_stats.is_rx_assoc_norate++; 2027 } 2028 2029 static void 2030 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 2031 int reassoc, int resp, const char *tag, int capinfo) 2032 { 2033 struct ieee80211com *ic = ni->ni_ic; 2034 2035 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 2036 "[%s] deny %s request, %s mismatch 0x%x\n", 2037 ether_sprintf(wh->i_addr2), 2038 reassoc ? "reassoc" : "assoc", tag, capinfo); 2039 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_CAPINFO); 2040 ieee80211_node_leave(ic, ni); 2041 ic->ic_stats.is_rx_assoc_capmismatch++; 2042 } 2043 2044 static void 2045 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 2046 int reassoc, int resp) 2047 { 2048 struct ieee80211com *ic = ni->ni_ic; 2049 2050 IEEE80211_NOTE_MAC(ic, IEEE80211_MSG_ANY, wh->i_addr2, 2051 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 2052 /* XXX no better code */ 2053 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_OTHER); 2054 ieee80211_node_leave(ic, ni); 2055 } 2056 2057 void 2058 ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0, 2059 struct ieee80211_node *ni, 2060 int subtype, int rssi, int noise, uint32_t rstamp) 2061 { 2062 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 2063 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 2064 struct ieee80211_frame *wh; 2065 uint8_t *frm, *efrm; 2066 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap, *htinfo; 2067 int reassoc, resp, allocbs; 2068 uint8_t rate; 2069 2070 wh = mtod(m0, struct ieee80211_frame *); 2071 frm = (uint8_t *)&wh[1]; 2072 efrm = mtod(m0, uint8_t *) + m0->m_len; 2073 switch (subtype) { 2074 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 2075 case IEEE80211_FC0_SUBTYPE_BEACON: { 2076 struct ieee80211_scanparams scan; 2077 2078 /* 2079 * We process beacon/probe response frames: 2080 * o when scanning, or 2081 * o station mode when associated (to collect state 2082 * updates such as 802.11g slot time), or 2083 * o adhoc mode (to discover neighbors) 2084 * Frames otherwise received are discarded. 2085 */ 2086 if (!((ic->ic_flags & IEEE80211_F_SCAN) || 2087 (ic->ic_opmode == IEEE80211_M_STA && ni->ni_associd) || 2088 ic->ic_opmode == IEEE80211_M_IBSS)) { 2089 ic->ic_stats.is_rx_mgtdiscard++; 2090 return; 2091 } 2092 /* 2093 * beacon/probe response frame format 2094 * [8] time stamp 2095 * [2] beacon interval 2096 * [2] capability information 2097 * [tlv] ssid 2098 * [tlv] supported rates 2099 * [tlv] country information 2100 * [tlv] parameter set (FH/DS) 2101 * [tlv] erp information 2102 * [tlv] extended supported rates 2103 * [tlv] WME 2104 * [tlv] WPA or RSN 2105 * [tlv] HT capabilities 2106 * [tlv] HT information 2107 * [tlv] Atheros capabilities 2108 */ 2109 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, return); 2110 memset(&scan, 0, sizeof(scan)); 2111 scan.tstamp = frm; frm += 8; 2112 scan.bintval = le16toh(*(uint16_t *)frm); frm += 2; 2113 scan.capinfo = le16toh(*(uint16_t *)frm); frm += 2; 2114 scan.bchan = IEEE80211_CHAN2IEEE(ic->ic_curchan); 2115 scan.curchan = ic->ic_curchan; 2116 2117 while (efrm - frm > 1) { 2118 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 2119 switch (*frm) { 2120 case IEEE80211_ELEMID_SSID: 2121 scan.ssid = frm; 2122 break; 2123 case IEEE80211_ELEMID_RATES: 2124 scan.rates = frm; 2125 break; 2126 case IEEE80211_ELEMID_COUNTRY: 2127 scan.country = frm; 2128 break; 2129 case IEEE80211_ELEMID_FHPARMS: 2130 if (ic->ic_phytype == IEEE80211_T_FH) { 2131 scan.fhdwell = LE_READ_2(&frm[2]); 2132 scan.bchan = IEEE80211_FH_CHAN(frm[4], frm[5]); 2133 scan.fhindex = frm[6]; 2134 } 2135 break; 2136 case IEEE80211_ELEMID_DSPARMS: 2137 /* 2138 * XXX hack this since depending on phytype 2139 * is problematic for multi-mode devices. 2140 */ 2141 if (ic->ic_phytype != IEEE80211_T_FH) 2142 scan.bchan = frm[2]; 2143 break; 2144 case IEEE80211_ELEMID_TIM: 2145 /* XXX ATIM? */ 2146 scan.tim = frm; 2147 scan.timoff = frm - mtod(m0, uint8_t *); 2148 break; 2149 case IEEE80211_ELEMID_IBSSPARMS: 2150 break; 2151 case IEEE80211_ELEMID_XRATES: 2152 scan.xrates = frm; 2153 break; 2154 case IEEE80211_ELEMID_ERP: 2155 if (frm[1] != 1) { 2156 IEEE80211_DISCARD_IE(ic, 2157 IEEE80211_MSG_ELEMID, wh, "ERP", 2158 "bad len %u", frm[1]); 2159 ic->ic_stats.is_rx_elem_toobig++; 2160 break; 2161 } 2162 scan.erp = frm[2]; 2163 break; 2164 case IEEE80211_ELEMID_HTCAP: 2165 scan.htcap = frm; 2166 break; 2167 case IEEE80211_ELEMID_RSN: 2168 scan.rsn = frm; 2169 break; 2170 case IEEE80211_ELEMID_HTINFO: 2171 scan.htinfo = frm; 2172 break; 2173 case IEEE80211_ELEMID_VENDOR: 2174 if (iswpaoui(frm)) 2175 scan.wpa = frm; 2176 else if (iswmeparam(frm) || iswmeinfo(frm)) 2177 scan.wme = frm; 2178 else if (isatherosoui(frm)) 2179 scan.ath = frm; 2180 else if (ic->ic_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 2181 /* 2182 * Accept pre-draft HT ie's if the 2183 * standard ones have not been seen. 2184 */ 2185 if (ishtcapoui(frm)) { 2186 if (scan.htcap == NULL) 2187 scan.htcap = frm; 2188 } else if (ishtinfooui(frm)) { 2189 if (scan.htinfo == NULL) 2190 scan.htcap = frm; 2191 } 2192 } 2193 break; 2194 default: 2195 IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID, 2196 wh, "unhandled", 2197 "id %u, len %u", *frm, frm[1]); 2198 ic->ic_stats.is_rx_elem_unknown++; 2199 break; 2200 } 2201 frm += frm[1] + 2; 2202 } 2203 IEEE80211_VERIFY_ELEMENT(scan.rates, IEEE80211_RATE_MAXSIZE); 2204 if (scan.xrates != NULL) 2205 IEEE80211_VERIFY_ELEMENT(scan.xrates, 2206 IEEE80211_RATE_MAXSIZE - scan.rates[1]); 2207 IEEE80211_VERIFY_ELEMENT(scan.ssid, IEEE80211_NWID_LEN); 2208 #if IEEE80211_CHAN_MAX < 255 2209 if (scan.chan > IEEE80211_CHAN_MAX) { 2210 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, 2211 wh, ieee80211_mgt_subtype_name[subtype >> 2212 IEEE80211_FC0_SUBTYPE_SHIFT], 2213 "invalid channel %u", scan.chan); 2214 ic->ic_stats.is_rx_badchan++; 2215 return; 2216 } 2217 #endif 2218 if (IEEE80211_CHAN2IEEE(scan.curchan) != scan.bchan && 2219 ic->ic_phytype != IEEE80211_T_FH) { 2220 /* 2221 * Frame was received on a channel different from the 2222 * one indicated in the DS params element id; 2223 * silently discard it. 2224 * 2225 * NB: this can happen due to signal leakage. 2226 * But we should take it for FH phy because 2227 * the rssi value should be correct even for 2228 * different hop pattern in FH. 2229 */ 2230 IEEE80211_DISCARD(ic, 2231 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 2232 wh, ieee80211_mgt_subtype_name[subtype >> 2233 IEEE80211_FC0_SUBTYPE_SHIFT], 2234 "for off-channel %u", 2235 IEEE80211_CHAN2IEEE(scan.curchan)); 2236 ic->ic_stats.is_rx_chanmismatch++; 2237 return; 2238 } 2239 if (!(IEEE80211_BINTVAL_MIN <= scan.bintval && 2240 scan.bintval <= IEEE80211_BINTVAL_MAX)) { 2241 IEEE80211_DISCARD(ic, 2242 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 2243 wh, ieee80211_mgt_subtype_name[subtype >> 2244 IEEE80211_FC0_SUBTYPE_SHIFT], 2245 "bogus beacon interval", scan.bintval); 2246 ic->ic_stats.is_rx_badbintval++; 2247 return; 2248 } 2249 /* 2250 * Process HT ie's. This is complicated by our 2251 * accepting both the standard ie's and the pre-draft 2252 * vendor OUI ie's that some vendors still use/require. 2253 */ 2254 if (scan.htcap != NULL) { 2255 IEEE80211_VERIFY_LENGTH(scan.htcap[1], 2256 scan.htcap[0] == IEEE80211_ELEMID_VENDOR ? 2257 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2258 sizeof(struct ieee80211_ie_htcap)-2, 2259 scan.htcap = NULL); 2260 } 2261 if (scan.htinfo != NULL) { 2262 IEEE80211_VERIFY_LENGTH(scan.htinfo[1], 2263 scan.htinfo[0] == IEEE80211_ELEMID_VENDOR ? 2264 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 2265 sizeof(struct ieee80211_ie_htinfo)-2, 2266 scan.htinfo = NULL); 2267 } 2268 2269 /* 2270 * Count frame now that we know it's to be processed. 2271 */ 2272 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 2273 ic->ic_stats.is_rx_beacon++; /* XXX remove */ 2274 IEEE80211_NODE_STAT(ni, rx_beacons); 2275 } else 2276 IEEE80211_NODE_STAT(ni, rx_proberesp); 2277 2278 /* 2279 * When operating in station mode, check for state updates. 2280 * Be careful to ignore beacons received while doing a 2281 * background scan. We consider only 11g/WMM stuff right now. 2282 */ 2283 if (ic->ic_opmode == IEEE80211_M_STA && 2284 ni->ni_associd != 0 && 2285 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 2286 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 2287 /* record tsf of last beacon */ 2288 memcpy(ni->ni_tstamp.data, scan.tstamp, 2289 sizeof(ni->ni_tstamp)); 2290 /* count beacon frame for s/w bmiss handling */ 2291 ic->ic_swbmiss_count++; 2292 ic->ic_bmiss_count = 0; 2293 if (ni->ni_erp != scan.erp) { 2294 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2295 "[%s] erp change: was 0x%x, now 0x%x\n", 2296 ether_sprintf(wh->i_addr2), 2297 ni->ni_erp, scan.erp); 2298 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2299 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 2300 ic->ic_flags |= IEEE80211_F_USEPROT; 2301 else 2302 ic->ic_flags &= ~IEEE80211_F_USEPROT; 2303 ni->ni_erp = scan.erp; 2304 /* XXX statistic */ 2305 } 2306 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 2307 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2308 "[%s] capabilities change: before 0x%x," 2309 " now 0x%x\n", 2310 ether_sprintf(wh->i_addr2), 2311 ni->ni_capinfo, scan.capinfo); 2312 /* 2313 * NB: we assume short preamble doesn't 2314 * change dynamically 2315 */ 2316 ieee80211_set_shortslottime(ic, 2317 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 2318 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 2319 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 2320 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 2321 /* XXX statistic */ 2322 } 2323 if (scan.wme != NULL && 2324 (ni->ni_flags & IEEE80211_NODE_QOS) && 2325 ieee80211_parse_wmeparams(ic, scan.wme, wh) > 0) 2326 ieee80211_wme_updateparams(ic); 2327 if (scan.ath != NULL) 2328 ieee80211_parse_athparams(ni, scan.ath, wh); 2329 if (scan.htcap != NULL) 2330 ieee80211_parse_htcap(ni, scan.htcap); 2331 if (scan.htinfo != NULL) { 2332 ieee80211_parse_htinfo(ni, scan.htinfo); 2333 if (ni->ni_chan != ic->ic_bsschan) { 2334 /* 2335 * Channel has been adjusted based on 2336 * negotiated HT parameters; force the 2337 * channel state to follow. 2338 */ 2339 ieee80211_setbsschan(ic, ni->ni_chan); 2340 } 2341 } 2342 if (scan.tim != NULL) { 2343 struct ieee80211_tim_ie *tim = 2344 (struct ieee80211_tim_ie *) scan.tim; 2345 #if 0 2346 int aid = IEEE80211_AID(ni->ni_associd); 2347 int ix = aid / NBBY; 2348 int min = tim->tim_bitctl &~ 1; 2349 int max = tim->tim_len + min - 4; 2350 if ((tim->tim_bitctl&1) || 2351 (min <= ix && ix <= max && 2352 isset(tim->tim_bitmap - min, aid))) { 2353 /* 2354 * XXX Do not let bg scan kick off 2355 * we are expecting data. 2356 */ 2357 ic->ic_lastdata = ticks; 2358 ieee80211_sta_pwrsave(ic, 0); 2359 } 2360 #endif 2361 ni->ni_dtim_count = tim->tim_count; 2362 ni->ni_dtim_period = tim->tim_period; 2363 } 2364 /* 2365 * If scanning, pass the info to the scan module. 2366 * Otherwise, check if it's the right time to do 2367 * a background scan. Background scanning must 2368 * be enabled and we must not be operating in the 2369 * turbo phase of dynamic turbo mode. Then, 2370 * it's been a while since the last background 2371 * scan and if no data frames have come through 2372 * recently, kick off a scan. Note that this 2373 * is the mechanism by which a background scan 2374 * is started _and_ continued each time we 2375 * return on-channel to receive a beacon from 2376 * our ap. 2377 */ 2378 if (ic->ic_flags & IEEE80211_F_SCAN) { 2379 ieee80211_add_scan(ic, &scan, wh, 2380 subtype, rssi, noise, rstamp); 2381 } else if (contbgscan(ic)) { 2382 ieee80211_bg_scan(ic); 2383 } else if (startbgscan(ic)) { 2384 #if 0 2385 /* wakeup if we are sleeing */ 2386 ieee80211_set_pwrsave(ic, 0); 2387 #endif 2388 ieee80211_bg_scan(ic); 2389 } 2390 return; 2391 } 2392 /* 2393 * If scanning, just pass information to the scan module. 2394 */ 2395 if (ic->ic_flags & IEEE80211_F_SCAN) { 2396 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 2397 /* 2398 * Actively scanning a channel marked passive; 2399 * send a probe request now that we know there 2400 * is 802.11 traffic present. 2401 * 2402 * XXX check if the beacon we recv'd gives 2403 * us what we need and suppress the probe req 2404 */ 2405 ieee80211_probe_curchan(ic, 1); 2406 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 2407 } 2408 ieee80211_add_scan(ic, &scan, wh, 2409 subtype, rssi, noise, rstamp); 2410 return; 2411 } 2412 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 2413 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 2414 /* 2415 * Create a new entry in the neighbor table. 2416 */ 2417 ni = ieee80211_add_neighbor(ic, wh, &scan); 2418 } else if (ni->ni_capinfo == 0) { 2419 /* 2420 * Update faked node created on transmit. 2421 * Note this also updates the tsf. 2422 */ 2423 ieee80211_init_neighbor(ni, wh, &scan); 2424 } else { 2425 /* 2426 * Record tsf for potential resync. 2427 */ 2428 memcpy(ni->ni_tstamp.data, scan.tstamp, 2429 sizeof(ni->ni_tstamp)); 2430 } 2431 if (ni != NULL) { 2432 ni->ni_rssi = rssi; 2433 ni->ni_noise = noise; 2434 ni->ni_rstamp = rstamp; 2435 } 2436 } 2437 break; 2438 } 2439 2440 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 2441 if (ic->ic_opmode == IEEE80211_M_STA || 2442 ic->ic_state != IEEE80211_S_RUN) { 2443 ic->ic_stats.is_rx_mgtdiscard++; 2444 return; 2445 } 2446 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 2447 /* frame must be directed */ 2448 ic->ic_stats.is_rx_mgtdiscard++; /* XXX stat */ 2449 return; 2450 } 2451 2452 /* 2453 * prreq frame format 2454 * [tlv] ssid 2455 * [tlv] supported rates 2456 * [tlv] extended supported rates 2457 * [tlv] Atheros capabilities 2458 */ 2459 ssid = rates = xrates = ath = NULL; 2460 while (efrm - frm > 1) { 2461 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 2462 switch (*frm) { 2463 case IEEE80211_ELEMID_SSID: 2464 ssid = frm; 2465 break; 2466 case IEEE80211_ELEMID_RATES: 2467 rates = frm; 2468 break; 2469 case IEEE80211_ELEMID_XRATES: 2470 xrates = frm; 2471 break; 2472 case IEEE80211_ELEMID_VENDOR: 2473 if (isatherosoui(frm)) 2474 ath = frm; 2475 break; 2476 } 2477 frm += frm[1] + 2; 2478 } 2479 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 2480 if (xrates != NULL) 2481 IEEE80211_VERIFY_ELEMENT(xrates, 2482 IEEE80211_RATE_MAXSIZE - rates[1]); 2483 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); 2484 IEEE80211_VERIFY_SSID(ic->ic_bss, ssid); 2485 if ((ic->ic_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 2486 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 2487 wh, ieee80211_mgt_subtype_name[subtype >> 2488 IEEE80211_FC0_SUBTYPE_SHIFT], 2489 "%s", "no ssid with ssid suppression enabled"); 2490 ic->ic_stats.is_rx_ssidmismatch++; /*XXX*/ 2491 return; 2492 } 2493 2494 allocbs = 0; 2495 if (ni == ic->ic_bss) { 2496 if (ic->ic_opmode != IEEE80211_M_IBSS) { 2497 ni = ieee80211_tmp_node(ic, wh->i_addr2); 2498 allocbs = 1; 2499 } else if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 2500 /* 2501 * XXX Cannot tell if the sender is operating 2502 * in ibss mode. But we need a new node to 2503 * send the response so blindly add them to the 2504 * neighbor table. 2505 */ 2506 ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta, 2507 wh->i_addr2); 2508 } 2509 if (ni == NULL) 2510 return; 2511 } 2512 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2513 "[%s] recv probe req\n", ether_sprintf(wh->i_addr2)); 2514 ni->ni_rssi = rssi; 2515 ni->ni_rstamp = rstamp; 2516 rate = ieee80211_setup_rates(ni, rates, xrates, 2517 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE 2518 | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2519 if (rate & IEEE80211_RATE_BASIC) { 2520 IEEE80211_DISCARD(ic, IEEE80211_MSG_XRATE, 2521 wh, ieee80211_mgt_subtype_name[subtype >> 2522 IEEE80211_FC0_SUBTYPE_SHIFT], 2523 "%s", "recv'd rate set invalid"); 2524 } else { 2525 IEEE80211_SEND_MGMT(ic, ni, 2526 IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0); 2527 } 2528 if (allocbs) { 2529 /* 2530 * Temporary node created just to send a 2531 * response, reclaim immediately. 2532 */ 2533 ieee80211_free_node(ni); 2534 } else if (ath != NULL) 2535 ieee80211_saveath(ni, ath); 2536 break; 2537 2538 case IEEE80211_FC0_SUBTYPE_AUTH: { 2539 uint16_t algo, seq, status; 2540 /* 2541 * auth frame format 2542 * [2] algorithm 2543 * [2] sequence 2544 * [2] status 2545 * [tlv*] challenge 2546 */ 2547 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 2548 algo = le16toh(*(uint16_t *)frm); 2549 seq = le16toh(*(uint16_t *)(frm + 2)); 2550 status = le16toh(*(uint16_t *)(frm + 4)); 2551 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 2552 "[%s] recv auth frame with algorithm %d seq %d\n", 2553 ether_sprintf(wh->i_addr2), algo, seq); 2554 /* 2555 * Consult the ACL policy module if setup. 2556 */ 2557 if (ic->ic_acl != NULL && 2558 !ic->ic_acl->iac_check(ic, wh->i_addr2)) { 2559 IEEE80211_DISCARD(ic, IEEE80211_MSG_ACL, 2560 wh, "auth", "%s", "disallowed by ACL"); 2561 ic->ic_stats.is_rx_acl++; 2562 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 2563 IEEE80211_SEND_MGMT(ic, ni, 2564 IEEE80211_FC0_SUBTYPE_AUTH, 2565 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 2566 } 2567 return; 2568 } 2569 if (ic->ic_flags & IEEE80211_F_COUNTERM) { 2570 IEEE80211_DISCARD(ic, 2571 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 2572 wh, "auth", "%s", "TKIP countermeasures enabled"); 2573 ic->ic_stats.is_rx_auth_countermeasures++; 2574 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 2575 IEEE80211_SEND_MGMT(ic, ni, 2576 IEEE80211_FC0_SUBTYPE_AUTH, 2577 IEEE80211_REASON_MIC_FAILURE); 2578 } 2579 return; 2580 } 2581 if (algo == IEEE80211_AUTH_ALG_SHARED) 2582 ieee80211_auth_shared(ic, wh, frm + 6, efrm, ni, rssi, 2583 noise, rstamp, seq, status); 2584 else if (algo == IEEE80211_AUTH_ALG_OPEN) 2585 ieee80211_auth_open(ic, wh, ni, rssi, noise, rstamp, 2586 seq, status); 2587 else { 2588 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 2589 wh, "auth", "unsupported alg %d", algo); 2590 ic->ic_stats.is_rx_auth_unsupported++; 2591 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 2592 /* XXX not right */ 2593 IEEE80211_SEND_MGMT(ic, ni, 2594 IEEE80211_FC0_SUBTYPE_AUTH, 2595 (seq+1) | (IEEE80211_STATUS_ALG<<16)); 2596 } 2597 return; 2598 } 2599 break; 2600 } 2601 2602 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2603 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 2604 uint16_t capinfo, lintval; 2605 struct ieee80211_rsnparms rsnparms; 2606 uint8_t reason; 2607 int badwparsn; 2608 2609 if (ic->ic_opmode != IEEE80211_M_HOSTAP || 2610 ic->ic_state != IEEE80211_S_RUN) { 2611 ic->ic_stats.is_rx_mgtdiscard++; 2612 return; 2613 } 2614 2615 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2616 reassoc = 1; 2617 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 2618 } else { 2619 reassoc = 0; 2620 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 2621 } 2622 /* 2623 * asreq frame format 2624 * [2] capability information 2625 * [2] listen interval 2626 * [6*] current AP address (reassoc only) 2627 * [tlv] ssid 2628 * [tlv] supported rates 2629 * [tlv] extended supported rates 2630 * [tlv] WPA or RSN 2631 * [tlv] HT capabilities 2632 * [tlv] Atheros capabilities 2633 */ 2634 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 2635 if (!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid)) { 2636 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 2637 wh, ieee80211_mgt_subtype_name[subtype >> 2638 IEEE80211_FC0_SUBTYPE_SHIFT], 2639 "%s", "wrong bssid"); 2640 ic->ic_stats.is_rx_assoc_bss++; 2641 return; 2642 } 2643 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 2644 lintval = le16toh(*(uint16_t *)frm); frm += 2; 2645 if (reassoc) 2646 frm += 6; /* ignore current AP info */ 2647 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 2648 while (efrm - frm > 1) { 2649 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 2650 switch (*frm) { 2651 case IEEE80211_ELEMID_SSID: 2652 ssid = frm; 2653 break; 2654 case IEEE80211_ELEMID_RATES: 2655 rates = frm; 2656 break; 2657 case IEEE80211_ELEMID_XRATES: 2658 xrates = frm; 2659 break; 2660 /* XXX verify only one of RSN and WPA ie's? */ 2661 case IEEE80211_ELEMID_RSN: 2662 rsn = frm; 2663 break; 2664 case IEEE80211_ELEMID_HTCAP: 2665 htcap = frm; 2666 break; 2667 case IEEE80211_ELEMID_VENDOR: 2668 if (iswpaoui(frm)) 2669 wpa = frm; 2670 else if (iswmeinfo(frm)) 2671 wme = frm; 2672 else if (isatherosoui(frm)) 2673 ath = frm; 2674 else if (ic->ic_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 2675 if (ishtcapoui(frm) && htcap == NULL) 2676 htcap = frm; 2677 } 2678 break; 2679 } 2680 frm += frm[1] + 2; 2681 } 2682 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 2683 if (xrates != NULL) 2684 IEEE80211_VERIFY_ELEMENT(xrates, 2685 IEEE80211_RATE_MAXSIZE - rates[1]); 2686 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); 2687 IEEE80211_VERIFY_SSID(ic->ic_bss, ssid); 2688 if (htcap != NULL) { 2689 IEEE80211_VERIFY_LENGTH(htcap[1], 2690 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2691 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2692 sizeof(struct ieee80211_ie_htcap)-2, 2693 return); /* XXX just NULL out? */ 2694 } 2695 2696 if (ni == ic->ic_bss) { 2697 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 2698 "[%s] deny %s request, sta not authenticated\n", 2699 ether_sprintf(wh->i_addr2), 2700 reassoc ? "reassoc" : "assoc"); 2701 ieee80211_send_error(ic, ni, wh->i_addr2, 2702 IEEE80211_FC0_SUBTYPE_DEAUTH, 2703 IEEE80211_REASON_ASSOC_NOT_AUTHED); 2704 ic->ic_stats.is_rx_assoc_notauth++; 2705 return; 2706 } 2707 /* assert right association security credentials */ 2708 badwparsn = 0; 2709 switch (ic->ic_flags & IEEE80211_F_WPA) { 2710 case IEEE80211_F_WPA1: 2711 if (wpa == NULL) 2712 badwparsn = 1; 2713 break; 2714 case IEEE80211_F_WPA2: 2715 if (rsn == NULL) 2716 badwparsn = 1; 2717 break; 2718 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 2719 if (wpa == NULL && rsn == NULL) 2720 badwparsn = 1; 2721 break; 2722 } 2723 if (badwparsn) { 2724 IEEE80211_DPRINTF(ic, 2725 IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 2726 "[%s] no WPA/RSN IE in association request\n", 2727 ether_sprintf(wh->i_addr2)); 2728 IEEE80211_SEND_MGMT(ic, ni, 2729 IEEE80211_FC0_SUBTYPE_DEAUTH, 2730 IEEE80211_REASON_IE_INVALID); 2731 ieee80211_node_leave(ic, ni); 2732 ic->ic_stats.is_rx_assoc_badwpaie++; 2733 return; 2734 } 2735 if (wpa != NULL || rsn != NULL) { 2736 /* 2737 * Parse WPA/RSN information element. Note that 2738 * we initialize the param block from the node 2739 * state so that information in the IE overrides 2740 * our defaults. The resulting parameters are 2741 * installed below after the association is assured. 2742 */ 2743 rsnparms = ni->ni_rsn; 2744 if (wpa != NULL) 2745 reason = ieee80211_parse_wpa(ic, wpa, &rsnparms, wh); 2746 else 2747 reason = ieee80211_parse_rsn(ic, rsn, &rsnparms, wh); 2748 if (reason != 0) { 2749 IEEE80211_SEND_MGMT(ic, ni, 2750 IEEE80211_FC0_SUBTYPE_DEAUTH, reason); 2751 ieee80211_node_leave(ic, ni); 2752 /* XXX distinguish WPA/RSN? */ 2753 ic->ic_stats.is_rx_assoc_badwpaie++; 2754 return; 2755 } 2756 IEEE80211_DPRINTF(ic, 2757 IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 2758 "[%s] %s ie: mc %u/%u uc %u/%u key %u caps 0x%x\n", 2759 ether_sprintf(wh->i_addr2), 2760 wpa != NULL ? "WPA" : "RSN", 2761 rsnparms.rsn_mcastcipher, rsnparms.rsn_mcastkeylen, 2762 rsnparms.rsn_ucastcipher, rsnparms.rsn_ucastkeylen, 2763 rsnparms.rsn_keymgmt, rsnparms.rsn_caps); 2764 } 2765 /* discard challenge after association */ 2766 if (ni->ni_challenge != NULL) { 2767 FREE(ni->ni_challenge, M_80211_NODE); 2768 ni->ni_challenge = NULL; 2769 } 2770 /* NB: 802.11 spec says to ignore station's privacy bit */ 2771 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2772 capinfomismatch(ni, wh, reassoc, resp, 2773 "capability", capinfo); 2774 return; 2775 } 2776 /* 2777 * Disallow re-associate w/ invalid slot time setting. 2778 */ 2779 if (ni->ni_associd != 0 && 2780 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2781 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2782 capinfomismatch(ni, wh, reassoc, resp, 2783 "slot time", capinfo); 2784 return; 2785 } 2786 rate = ieee80211_setup_rates(ni, rates, xrates, 2787 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2788 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2789 if (rate & IEEE80211_RATE_BASIC) { 2790 ratesetmismatch(ni, wh, reassoc, resp, "basic", rate); 2791 return; 2792 } 2793 /* 2794 * If constrained to 11g-only stations reject an 2795 * 11b-only station. We cheat a bit here by looking 2796 * at the max negotiated xmit rate and assuming anyone 2797 * with a best rate <24Mb/s is an 11b station. 2798 */ 2799 if ((ic->ic_flags & IEEE80211_F_PUREG) && rate < 48) { 2800 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2801 return; 2802 } 2803 /* XXX enforce PUREN */ 2804 /* 802.11n-specific rateset handling */ 2805 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan) && htcap != NULL) { 2806 rate = ieee80211_setup_htrates(ni, htcap, 2807 IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | 2808 IEEE80211_F_DOBRS); 2809 if (rate & IEEE80211_RATE_BASIC) { 2810 /* XXX 11n-specific stat */ 2811 ratesetmismatch(ni, wh, reassoc, resp, 2812 "HT", rate); 2813 return; 2814 } 2815 ieee80211_ht_node_init(ni, htcap); 2816 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2817 ieee80211_ht_node_cleanup(ni); 2818 /* 2819 * Allow AMPDU operation only with unencrypted traffic 2820 * or AES-CCM; the 11n spec only specifies these ciphers 2821 * so permitting any others is undefined and can lead 2822 * to interoperability problems. 2823 * 2824 * NB: We check for AES by looking at the GTK cipher 2825 * since the WPA/11i specs say the PTK cipher has 2826 * to be "as good or better". 2827 */ 2828 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2829 (((ic->ic_flags & IEEE80211_F_WPA) && 2830 rsnparms.rsn_mcastcipher != IEEE80211_CIPHER_AES_CCM) || 2831 (ic->ic_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2832 IEEE80211_NOTE(ic, 2833 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2834 "disallow HT use because WEP or TKIP requested, " 2835 "capinfo 0x%x mcastcipher %d", capinfo, 2836 rsnparms.rsn_mcastcipher); 2837 ieee80211_ht_node_cleanup(ni); 2838 ic->ic_stats.is_ht_assoc_downgrade++; 2839 } 2840 /* 2841 * If constrained to 11n-only stations reject legacy stations. 2842 */ 2843 if ((ic->ic_flags_ext & IEEE80211_FEXT_PUREN) && 2844 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2845 htcapmismatch(ni, wh, reassoc, resp); 2846 ic->ic_stats.is_ht_assoc_nohtcap++; 2847 return; 2848 } 2849 ni->ni_rssi = rssi; 2850 ni->ni_noise = noise; 2851 ni->ni_rstamp = rstamp; 2852 ni->ni_intval = lintval; 2853 ni->ni_capinfo = capinfo; 2854 ni->ni_chan = ic->ic_bsschan; 2855 ni->ni_fhdwell = ic->ic_bss->ni_fhdwell; 2856 ni->ni_fhindex = ic->ic_bss->ni_fhindex; 2857 if (wpa != NULL) { 2858 /* 2859 * Record WPA parameters for station, mark 2860 * node as using WPA and record information element 2861 * for applications that require it. 2862 */ 2863 ni->ni_rsn = rsnparms; 2864 ieee80211_saveie(&ni->ni_wpa_ie, wpa); 2865 } else if (ni->ni_wpa_ie != NULL) { 2866 /* 2867 * Flush any state from a previous association. 2868 */ 2869 FREE(ni->ni_wpa_ie, M_80211_NODE); 2870 ni->ni_wpa_ie = NULL; 2871 } 2872 if (rsn != NULL) { 2873 /* 2874 * Record RSN parameters for station, mark 2875 * node as using WPA and record information element 2876 * for applications that require it. 2877 */ 2878 ni->ni_rsn = rsnparms; 2879 ieee80211_saveie(&ni->ni_rsn_ie, rsn); 2880 } else if (ni->ni_rsn_ie != NULL) { 2881 /* 2882 * Flush any state from a previous association. 2883 */ 2884 FREE(ni->ni_rsn_ie, M_80211_NODE); 2885 ni->ni_rsn_ie = NULL; 2886 } 2887 if (wme != NULL) { 2888 /* 2889 * Record WME parameters for station, mark node 2890 * as capable of QoS and record information 2891 * element for applications that require it. 2892 */ 2893 ieee80211_saveie(&ni->ni_wme_ie, wme); 2894 ni->ni_flags |= IEEE80211_NODE_QOS; 2895 } else if (ni->ni_wme_ie != NULL) { 2896 /* 2897 * Flush any state from a previous association. 2898 */ 2899 FREE(ni->ni_wme_ie, M_80211_NODE); 2900 ni->ni_wme_ie = NULL; 2901 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2902 } 2903 if (ath != NULL) { 2904 /* 2905 * Record ATH parameters for station, mark 2906 * node with appropriate capabilities, and 2907 * record the information element for 2908 * applications that require it. 2909 */ 2910 ieee80211_saveath(ni, ath); 2911 } else if (ni->ni_ath_ie != NULL) { 2912 /* 2913 * Flush any state from a previous association. 2914 */ 2915 FREE(ni->ni_ath_ie, M_80211_NODE); 2916 ni->ni_ath_ie = NULL; 2917 ni->ni_ath_flags = 0; 2918 } 2919 ieee80211_node_join(ic, ni, resp); 2920 ieee80211_deliver_l2uf(ni); 2921 break; 2922 } 2923 2924 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2925 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 2926 uint16_t capinfo, associd; 2927 uint16_t status; 2928 2929 if (ic->ic_opmode != IEEE80211_M_STA || 2930 ic->ic_state != IEEE80211_S_ASSOC) { 2931 ic->ic_stats.is_rx_mgtdiscard++; 2932 return; 2933 } 2934 2935 /* 2936 * asresp frame format 2937 * [2] capability information 2938 * [2] status 2939 * [2] association ID 2940 * [tlv] supported rates 2941 * [tlv] extended supported rates 2942 * [tlv] WME 2943 * [tlv] HT capabilities 2944 * [tlv] HT info 2945 */ 2946 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 2947 ni = ic->ic_bss; 2948 capinfo = le16toh(*(uint16_t *)frm); 2949 frm += 2; 2950 status = le16toh(*(uint16_t *)frm); 2951 frm += 2; 2952 if (status != 0) { 2953 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2954 "[%s] %sassoc failed (reason %d)\n", 2955 ether_sprintf(wh->i_addr2), 2956 ISREASSOC(subtype) ? "re" : "", status); 2957 if (ni != ic->ic_bss) /* XXX never true? */ 2958 ni->ni_fails++; 2959 ic->ic_stats.is_rx_auth_fail++; /* XXX */ 2960 return; 2961 } 2962 associd = le16toh(*(uint16_t *)frm); 2963 frm += 2; 2964 2965 rates = xrates = wme = htcap = htinfo = NULL; 2966 while (efrm - frm > 1) { 2967 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 2968 switch (*frm) { 2969 case IEEE80211_ELEMID_RATES: 2970 rates = frm; 2971 break; 2972 case IEEE80211_ELEMID_XRATES: 2973 xrates = frm; 2974 break; 2975 case IEEE80211_ELEMID_HTCAP: 2976 htcap = frm; 2977 break; 2978 case IEEE80211_ELEMID_HTINFO: 2979 htinfo = frm; 2980 break; 2981 case IEEE80211_ELEMID_VENDOR: 2982 if (iswmeoui(frm)) 2983 wme = frm; 2984 else if (ic->ic_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 2985 /* 2986 * Accept pre-draft HT ie's if the 2987 * standard ones have not been seen. 2988 */ 2989 if (ishtcapoui(frm)) { 2990 if (htcap == NULL) 2991 htcap = frm; 2992 } else if (ishtinfooui(frm)) { 2993 if (htinfo == NULL) 2994 htcap = frm; 2995 } 2996 } 2997 /* XXX Atheros OUI support */ 2998 break; 2999 } 3000 frm += frm[1] + 2; 3001 } 3002 3003 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 3004 if (xrates != NULL) 3005 IEEE80211_VERIFY_ELEMENT(xrates, 3006 IEEE80211_RATE_MAXSIZE - rates[1]); 3007 rate = ieee80211_setup_rates(ni, rates, xrates, 3008 IEEE80211_F_JOIN | 3009 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 3010 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 3011 if (rate & IEEE80211_RATE_BASIC) { 3012 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 3013 "[%s] %sassoc failed (rate set mismatch)\n", 3014 ether_sprintf(wh->i_addr2), 3015 ISREASSOC(subtype) ? "re" : ""); 3016 if (ni != ic->ic_bss) /* XXX never true? */ 3017 ni->ni_fails++; 3018 ic->ic_stats.is_rx_assoc_norate++; 3019 ieee80211_new_state(ic, IEEE80211_S_SCAN, 3020 IEEE80211_SCAN_FAIL_STATUS); 3021 return; 3022 } 3023 3024 ni->ni_capinfo = capinfo; 3025 ni->ni_associd = associd; 3026 if (wme != NULL && 3027 ieee80211_parse_wmeparams(ic, wme, wh) >= 0) { 3028 ni->ni_flags |= IEEE80211_NODE_QOS; 3029 ieee80211_wme_updateparams(ic); 3030 } else 3031 ni->ni_flags &= ~IEEE80211_NODE_QOS; 3032 /* 3033 * Setup HT state according to the negotiation. 3034 */ 3035 if ((ic->ic_htcaps & IEEE80211_HTC_HT) && 3036 htcap != NULL && htinfo != NULL) { 3037 ieee80211_ht_node_init(ni, htcap); 3038 ieee80211_parse_htinfo(ni, htinfo); 3039 ieee80211_setup_htrates(ni, 3040 htcap, IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 3041 ieee80211_setup_basic_htrates(ni, htinfo); 3042 if (ni->ni_chan != ic->ic_bsschan) { 3043 /* 3044 * Channel has been adjusted based on 3045 * negotiated HT parameters; force the 3046 * channel state to follow. 3047 */ 3048 ieee80211_setbsschan(ic, ni->ni_chan); 3049 } 3050 } 3051 /* 3052 * Configure state now that we are associated. 3053 * 3054 * XXX may need different/additional driver callbacks? 3055 */ 3056 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 3057 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 3058 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 3059 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 3060 } else { 3061 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 3062 ic->ic_flags |= IEEE80211_F_USEBARKER; 3063 } 3064 ieee80211_set_shortslottime(ic, 3065 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 3066 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 3067 /* 3068 * Honor ERP protection. 3069 * 3070 * NB: ni_erp should zero for non-11g operation. 3071 */ 3072 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 3073 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 3074 ic->ic_flags |= IEEE80211_F_USEPROT; 3075 else 3076 ic->ic_flags &= ~IEEE80211_F_USEPROT; 3077 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 3078 "[%s] %sassoc success: %s preamble, %s slot time%s%s%s%s\n", 3079 ether_sprintf(wh->i_addr2), 3080 ISREASSOC(subtype) ? "re" : "", 3081 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 3082 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 3083 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 3084 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 3085 ni->ni_flags & IEEE80211_NODE_HT ? 3086 (ni->ni_chw == 20 ? ", HT20" : ", HT40") : "", 3087 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 3088 IEEE80211_ATH_CAP(ic, ni, IEEE80211_NODE_FF) ? 3089 ", fast-frames" : "", 3090 IEEE80211_ATH_CAP(ic, ni, IEEE80211_NODE_TURBOP) ? 3091 ", turbo" : "" 3092 ); 3093 ieee80211_new_state(ic, IEEE80211_S_RUN, subtype); 3094 break; 3095 } 3096 3097 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 3098 uint16_t reason; 3099 3100 if (ic->ic_state == IEEE80211_S_SCAN) { 3101 ic->ic_stats.is_rx_mgtdiscard++; 3102 return; 3103 } 3104 /* 3105 * deauth frame format 3106 * [2] reason 3107 */ 3108 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 3109 reason = le16toh(*(uint16_t *)frm); 3110 ic->ic_stats.is_rx_deauth++; 3111 IEEE80211_NODE_STAT(ni, rx_deauth); 3112 3113 if (!IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_myaddr)) { 3114 /* NB: can happen when in promiscuous mode */ 3115 ic->ic_stats.is_rx_mgtdiscard++; 3116 break; 3117 } 3118 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 3119 "[%s] recv deauthenticate (reason %d)\n", 3120 ether_sprintf(ni->ni_macaddr), reason); 3121 switch (ic->ic_opmode) { 3122 case IEEE80211_M_STA: 3123 ieee80211_new_state(ic, IEEE80211_S_AUTH, 3124 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 3125 break; 3126 case IEEE80211_M_HOSTAP: 3127 if (ni != ic->ic_bss) 3128 ieee80211_node_leave(ic, ni); 3129 break; 3130 default: 3131 ic->ic_stats.is_rx_mgtdiscard++; 3132 break; 3133 } 3134 break; 3135 } 3136 3137 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 3138 uint16_t reason; 3139 3140 if (ic->ic_state != IEEE80211_S_RUN && 3141 ic->ic_state != IEEE80211_S_ASSOC && 3142 ic->ic_state != IEEE80211_S_AUTH) { 3143 ic->ic_stats.is_rx_mgtdiscard++; 3144 return; 3145 } 3146 /* 3147 * disassoc frame format 3148 * [2] reason 3149 */ 3150 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 3151 reason = le16toh(*(uint16_t *)frm); 3152 ic->ic_stats.is_rx_disassoc++; 3153 IEEE80211_NODE_STAT(ni, rx_disassoc); 3154 3155 if (!IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_myaddr)) { 3156 /* NB: can happen when in promiscuous mode */ 3157 ic->ic_stats.is_rx_mgtdiscard++; 3158 break; 3159 } 3160 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 3161 "[%s] recv disassociate (reason %d)\n", 3162 ether_sprintf(ni->ni_macaddr), reason); 3163 switch (ic->ic_opmode) { 3164 case IEEE80211_M_STA: 3165 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 0); 3166 break; 3167 case IEEE80211_M_HOSTAP: 3168 if (ni != ic->ic_bss) 3169 ieee80211_node_leave(ic, ni); 3170 break; 3171 default: 3172 ic->ic_stats.is_rx_mgtdiscard++; 3173 break; 3174 } 3175 break; 3176 } 3177 3178 case IEEE80211_FC0_SUBTYPE_ACTION: { 3179 const struct ieee80211_action *ia; 3180 3181 if (ic->ic_state != IEEE80211_S_RUN && 3182 ic->ic_state != IEEE80211_S_ASSOC && 3183 ic->ic_state != IEEE80211_S_AUTH) { 3184 ic->ic_stats.is_rx_mgtdiscard++; 3185 return; 3186 } 3187 /* 3188 * action frame format: 3189 * [1] category 3190 * [1] action 3191 * [tlv] parameters 3192 */ 3193 IEEE80211_VERIFY_LENGTH(efrm - frm, 3194 sizeof(struct ieee80211_action), return); 3195 ia = (const struct ieee80211_action *) frm; 3196 3197 ic->ic_stats.is_rx_action++; 3198 IEEE80211_NODE_STAT(ni, rx_action); 3199 3200 /* verify frame payloads but defer processing */ 3201 /* XXX maybe push this to method */ 3202 switch (ia->ia_category) { 3203 case IEEE80211_ACTION_CAT_BA: 3204 switch (ia->ia_action) { 3205 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 3206 IEEE80211_VERIFY_LENGTH(efrm - frm, 3207 sizeof(struct ieee80211_action_ba_addbarequest), 3208 return); 3209 break; 3210 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 3211 IEEE80211_VERIFY_LENGTH(efrm - frm, 3212 sizeof(struct ieee80211_action_ba_addbaresponse), 3213 return); 3214 break; 3215 case IEEE80211_ACTION_BA_DELBA: 3216 IEEE80211_VERIFY_LENGTH(efrm - frm, 3217 sizeof(struct ieee80211_action_ba_delba), 3218 return); 3219 break; 3220 } 3221 break; 3222 case IEEE80211_ACTION_CAT_HT: 3223 switch (ia->ia_action) { 3224 case IEEE80211_ACTION_HT_TXCHWIDTH: 3225 IEEE80211_VERIFY_LENGTH(efrm - frm, 3226 sizeof(struct ieee80211_action_ht_txchwidth), 3227 return); 3228 break; 3229 } 3230 break; 3231 } 3232 ic->ic_recv_action(ni, frm, efrm); 3233 break; 3234 } 3235 3236 default: 3237 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 3238 wh, "mgt", "subtype 0x%x not handled", subtype); 3239 ic->ic_stats.is_rx_badsubtype++; 3240 break; 3241 } 3242 #undef ISREASSOC 3243 #undef ISPROBE 3244 } 3245 #undef IEEE80211_VERIFY_LENGTH 3246 #undef IEEE80211_VERIFY_ELEMENT 3247 3248 /* 3249 * Process a received ps-poll frame. 3250 */ 3251 static void 3252 ieee80211_recv_pspoll(struct ieee80211com *ic, 3253 struct ieee80211_node *ni, struct mbuf *m0) 3254 { 3255 struct ieee80211_frame_min *wh; 3256 struct mbuf *m; 3257 uint16_t aid; 3258 int qlen; 3259 3260 wh = mtod(m0, struct ieee80211_frame_min *); 3261 if (ni->ni_associd == 0) { 3262 IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 3263 (struct ieee80211_frame *) wh, "ps-poll", 3264 "%s", "unassociated station"); 3265 ic->ic_stats.is_ps_unassoc++; 3266 IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 3267 IEEE80211_REASON_NOT_ASSOCED); 3268 return; 3269 } 3270 3271 aid = le16toh(*(uint16_t *)wh->i_dur); 3272 if (aid != ni->ni_associd) { 3273 IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 3274 (struct ieee80211_frame *) wh, "ps-poll", 3275 "aid mismatch: sta aid 0x%x poll aid 0x%x", 3276 ni->ni_associd, aid); 3277 ic->ic_stats.is_ps_badaid++; 3278 IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 3279 IEEE80211_REASON_NOT_ASSOCED); 3280 return; 3281 } 3282 3283 /* Okay, take the first queued packet and put it out... */ 3284 IEEE80211_NODE_SAVEQ_DEQUEUE(ni, m, qlen); 3285 if (m == NULL) { 3286 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 3287 "[%s] recv ps-poll, but queue empty\n", 3288 ether_sprintf(wh->i_addr2)); 3289 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 3290 ic->ic_stats.is_ps_qempty++; /* XXX node stat */ 3291 if (ic->ic_set_tim != NULL) 3292 ic->ic_set_tim(ni, 0); /* just in case */ 3293 return; 3294 } 3295 /* 3296 * If there are more packets, set the more packets bit 3297 * in the packet dispatched to the station; otherwise 3298 * turn off the TIM bit. 3299 */ 3300 if (qlen != 0) { 3301 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 3302 "[%s] recv ps-poll, send packet, %u still queued\n", 3303 ether_sprintf(ni->ni_macaddr), qlen); 3304 m->m_flags |= M_MORE_DATA; 3305 } else { 3306 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 3307 "[%s] recv ps-poll, send packet, queue empty\n", 3308 ether_sprintf(ni->ni_macaddr)); 3309 if (ic->ic_set_tim != NULL) 3310 ic->ic_set_tim(ni, 0); 3311 } 3312 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 3313 IF_ENQUEUE(&ic->ic_ifp->if_snd, m); 3314 } 3315 3316 #ifdef IEEE80211_DEBUG 3317 /* 3318 * Debugging support. 3319 */ 3320 3321 /* 3322 * Return the bssid of a frame. 3323 */ 3324 static const uint8_t * 3325 ieee80211_getbssid(struct ieee80211com *ic, const struct ieee80211_frame *wh) 3326 { 3327 if (ic->ic_opmode == IEEE80211_M_STA) 3328 return wh->i_addr2; 3329 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 3330 return wh->i_addr1; 3331 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 3332 return wh->i_addr1; 3333 return wh->i_addr3; 3334 } 3335 3336 void 3337 ieee80211_note(struct ieee80211com *ic, const char *fmt, ...) 3338 { 3339 char buf[128]; /* XXX */ 3340 va_list ap; 3341 3342 va_start(ap, fmt); 3343 vsnprintf(buf, sizeof(buf), fmt, ap); 3344 va_end(ap); 3345 3346 if_printf(ic->ic_ifp, "%s", buf); /* NB: no \n */ 3347 } 3348 3349 void 3350 ieee80211_note_frame(struct ieee80211com *ic, 3351 const struct ieee80211_frame *wh, 3352 const char *fmt, ...) 3353 { 3354 char buf[128]; /* XXX */ 3355 va_list ap; 3356 3357 va_start(ap, fmt); 3358 vsnprintf(buf, sizeof(buf), fmt, ap); 3359 va_end(ap); 3360 if_printf(ic->ic_ifp, "[%s] %s\n", 3361 ether_sprintf(ieee80211_getbssid(ic, wh)), buf); 3362 } 3363 3364 void 3365 ieee80211_note_mac(struct ieee80211com *ic, 3366 const uint8_t mac[IEEE80211_ADDR_LEN], 3367 const char *fmt, ...) 3368 { 3369 char buf[128]; /* XXX */ 3370 va_list ap; 3371 3372 va_start(ap, fmt); 3373 vsnprintf(buf, sizeof(buf), fmt, ap); 3374 va_end(ap); 3375 if_printf(ic->ic_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 3376 } 3377 3378 void 3379 ieee80211_discard_frame(struct ieee80211com *ic, 3380 const struct ieee80211_frame *wh, 3381 const char *type, const char *fmt, ...) 3382 { 3383 va_list ap; 3384 3385 printf("[%s:%s] discard ", ic->ic_ifp->if_xname, 3386 ether_sprintf(ieee80211_getbssid(ic, wh))); 3387 if (type != NULL) 3388 printf("%s frame, ", type); 3389 else 3390 printf("frame, "); 3391 va_start(ap, fmt); 3392 vprintf(fmt, ap); 3393 va_end(ap); 3394 printf("\n"); 3395 } 3396 3397 void 3398 ieee80211_discard_ie(struct ieee80211com *ic, 3399 const struct ieee80211_frame *wh, 3400 const char *type, const char *fmt, ...) 3401 { 3402 va_list ap; 3403 3404 printf("[%s:%s] discard ", ic->ic_ifp->if_xname, 3405 ether_sprintf(ieee80211_getbssid(ic, wh))); 3406 if (type != NULL) 3407 printf("%s information element, ", type); 3408 else 3409 printf("information element, "); 3410 va_start(ap, fmt); 3411 vprintf(fmt, ap); 3412 va_end(ap); 3413 printf("\n"); 3414 } 3415 3416 void 3417 ieee80211_discard_mac(struct ieee80211com *ic, 3418 const uint8_t mac[IEEE80211_ADDR_LEN], 3419 const char *type, const char *fmt, ...) 3420 { 3421 va_list ap; 3422 3423 printf("[%s:%s] discard ", ic->ic_ifp->if_xname, ether_sprintf(mac)); 3424 if (type != NULL) 3425 printf("%s frame, ", type); 3426 else 3427 printf("frame, "); 3428 va_start(ap, fmt); 3429 vprintf(fmt, ap); 3430 va_end(ap); 3431 printf("\n"); 3432 } 3433 #endif /* IEEE80211_DEBUG */
Cache object: c1bb0f5ec405cdd00da78e5a3f689238
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