ieee80211_input.c revision 172055
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: head/sys/net80211/ieee80211_input.c 172055 2007-09-05 20:29:51Z sam $"); 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 */ 58static __inline int 59doprint(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 70static const uint8_t *ieee80211_getbssid(struct ieee80211com *, 71 const struct ieee80211_frame *); 72#endif /* IEEE80211_DEBUG */ 73 74static struct mbuf *ieee80211_defrag(struct ieee80211com *, 75 struct ieee80211_node *, struct mbuf *, int); 76static struct mbuf *ieee80211_decap(struct ieee80211com *, struct mbuf *, int); 77static void ieee80211_send_error(struct ieee80211com *, struct ieee80211_node *, 78 const uint8_t *mac, int subtype, int arg); 79static struct mbuf *ieee80211_decap_fastframe(struct ieee80211com *, 80 struct ieee80211_node *, struct mbuf *); 81static 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 */ 94int 95ieee80211_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 } 604err: 605 ifp->if_ierrors++; 606out: 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 */ 619static struct mbuf * 620ieee80211_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 707void 708ieee80211_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 (void) IF_HANDOFF(&ifp->if_snd, m1, ifp); 767 } 768 if (m != NULL) { 769 m->m_pkthdr.rcvif = ifp; 770 if (ni->ni_vlan != 0) { 771 /* attach vlan tag */ 772 m->m_pkthdr.ether_vtag = ni->ni_vlan; 773 m->m_flags |= M_VLANTAG; 774 } 775 (*ifp->if_input)(ifp, m); 776 } 777} 778 779static struct mbuf * 780ieee80211_decap(struct ieee80211com *ic, struct mbuf *m, int hdrlen) 781{ 782 struct ieee80211_qosframe_addr4 wh; /* Max size address frames */ 783 struct ether_header *eh; 784 struct llc *llc; 785 786 if (m->m_len < hdrlen + sizeof(*llc) && 787 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 788 /* XXX stat, msg */ 789 return NULL; 790 } 791 memcpy(&wh, mtod(m, caddr_t), hdrlen); 792 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 793 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 794 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 795 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0) { 796 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 797 llc = NULL; 798 } else { 799 m_adj(m, hdrlen - sizeof(*eh)); 800 } 801 eh = mtod(m, struct ether_header *); 802 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 803 case IEEE80211_FC1_DIR_NODS: 804 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 805 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 806 break; 807 case IEEE80211_FC1_DIR_TODS: 808 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 809 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 810 break; 811 case IEEE80211_FC1_DIR_FROMDS: 812 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 813 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 814 break; 815 case IEEE80211_FC1_DIR_DSTODS: 816 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 817 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 818 break; 819 } 820#ifdef ALIGNED_POINTER 821 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 822 struct mbuf *n, *n0, **np; 823 caddr_t newdata; 824 int off, pktlen; 825 826 n0 = NULL; 827 np = &n0; 828 off = 0; 829 pktlen = m->m_pkthdr.len; 830 while (pktlen > off) { 831 if (n0 == NULL) { 832 MGETHDR(n, M_DONTWAIT, MT_DATA); 833 if (n == NULL) { 834 m_freem(m); 835 return NULL; 836 } 837 M_MOVE_PKTHDR(n, m); 838 n->m_len = MHLEN; 839 } else { 840 MGET(n, M_DONTWAIT, MT_DATA); 841 if (n == NULL) { 842 m_freem(m); 843 m_freem(n0); 844 return NULL; 845 } 846 n->m_len = MLEN; 847 } 848 if (pktlen - off >= MINCLSIZE) { 849 MCLGET(n, M_DONTWAIT); 850 if (n->m_flags & M_EXT) 851 n->m_len = n->m_ext.ext_size; 852 } 853 if (n0 == NULL) { 854 newdata = 855 (caddr_t)ALIGN(n->m_data + sizeof(*eh)) - 856 sizeof(*eh); 857 n->m_len -= newdata - n->m_data; 858 n->m_data = newdata; 859 } 860 if (n->m_len > pktlen - off) 861 n->m_len = pktlen - off; 862 m_copydata(m, off, n->m_len, mtod(n, caddr_t)); 863 off += n->m_len; 864 *np = n; 865 np = &n->m_next; 866 } 867 m_freem(m); 868 m = n0; 869 } 870#endif /* ALIGNED_POINTER */ 871 if (llc != NULL) { 872 eh = mtod(m, struct ether_header *); 873 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 874 } 875 return m; 876} 877 878/* 879 * Decap a frame encapsulated in a fast-frame/A-MSDU. 880 */ 881struct mbuf * 882ieee80211_decap1(struct mbuf *m, int *framelen) 883{ 884#define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 885 struct ether_header *eh; 886 struct llc *llc; 887 888 /* 889 * The frame has an 802.3 header followed by an 802.2 890 * LLC header. The encapsulated frame length is in the 891 * first header type field; save that and overwrite it 892 * with the true type field found in the second. Then 893 * copy the 802.3 header up to where it belongs and 894 * adjust the mbuf contents to remove the void. 895 */ 896 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 897 return NULL; 898 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 899 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 900 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 901 + sizeof(struct ether_header) - sizeof(struct llc); 902 eh->ether_type = llc->llc_un.type_snap.ether_type; 903 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 904 sizeof(struct ether_header)); 905 m_adj(m, sizeof(struct llc)); 906 return m; 907#undef FF_LLC_SIZE 908} 909 910/* 911 * Decap the encapsulated frame pair and dispatch the first 912 * for delivery. The second frame is returned for delivery 913 * via the normal path. 914 */ 915static struct mbuf * 916ieee80211_decap_fastframe(struct ieee80211com *ic, 917 struct ieee80211_node *ni, struct mbuf *m) 918{ 919#define MS(x,f) (((x) & f) >> f##_S) 920 uint32_t ath; 921 struct mbuf *n; 922 int framelen; 923 924 m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath); 925 if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) { 926 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 927 ni->ni_macaddr, "fast-frame", 928 "unsupport tunnel protocol, header 0x%x", ath); 929 ic->ic_stats.is_ff_badhdr++; 930 m_freem(m); 931 return NULL; 932 } 933 /* NB: skip header and alignment padding */ 934 m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2); 935 936 ic->ic_stats.is_ff_decap++; 937 938 /* 939 * Decap the first frame, bust it apart from the 940 * second and deliver; then decap the second frame 941 * and return it to the caller for normal delivery. 942 */ 943 m = ieee80211_decap1(m, &framelen); 944 if (m == NULL) { 945 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 946 ni->ni_macaddr, "fast-frame", "%s", "first decap failed"); 947 ic->ic_stats.is_ff_tooshort++; 948 return NULL; 949 } 950 n = m_split(m, framelen, M_NOWAIT); 951 if (n == NULL) { 952 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 953 ni->ni_macaddr, "fast-frame", 954 "%s", "unable to split encapsulated frames"); 955 ic->ic_stats.is_ff_split++; 956 m_freem(m); /* NB: must reclaim */ 957 return NULL; 958 } 959 ieee80211_deliver_data(ic, ni, m); /* 1st of pair */ 960 961 /* 962 * Decap second frame. 963 */ 964 m_adj(n, roundup2(framelen, 4) - framelen); /* padding */ 965 n = ieee80211_decap1(n, &framelen); 966 if (n == NULL) { 967 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 968 ni->ni_macaddr, "fast-frame", "%s", "second decap failed"); 969 ic->ic_stats.is_ff_tooshort++; 970 } 971 /* XXX verify framelen against mbuf contents */ 972 return n; /* 2nd delivered by caller */ 973#undef MS 974} 975 976/* 977 * Install received rate set information in the node's state block. 978 */ 979int 980ieee80211_setup_rates(struct ieee80211_node *ni, 981 const uint8_t *rates, const uint8_t *xrates, int flags) 982{ 983 struct ieee80211com *ic = ni->ni_ic; 984 struct ieee80211_rateset *rs = &ni->ni_rates; 985 986 memset(rs, 0, sizeof(*rs)); 987 rs->rs_nrates = rates[1]; 988 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 989 if (xrates != NULL) { 990 uint8_t nxrates; 991 /* 992 * Tack on 11g extended supported rate element. 993 */ 994 nxrates = xrates[1]; 995 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 996 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 997 IEEE80211_DPRINTF(ic, IEEE80211_MSG_XRATE, 998 "[%s] extended rate set too large;" 999 " only using %u of %u rates\n", 1000 ether_sprintf(ni->ni_macaddr), nxrates, xrates[1]); 1001 ic->ic_stats.is_rx_rstoobig++; 1002 } 1003 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 1004 rs->rs_nrates += nxrates; 1005 } 1006 return ieee80211_fix_rate(ni, rs, flags); 1007} 1008 1009static void 1010ieee80211_auth_open(struct ieee80211com *ic, struct ieee80211_frame *wh, 1011 struct ieee80211_node *ni, int rssi, int noise, uint32_t rstamp, 1012 uint16_t seq, uint16_t status) 1013{ 1014 1015 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 1016 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1017 ni->ni_macaddr, "open auth", 1018 "bad sta auth mode %u", ni->ni_authmode); 1019 ic->ic_stats.is_rx_bad_auth++; /* XXX */ 1020 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 1021 /* 1022 * Clear any challenge text that may be there if 1023 * a previous shared key auth failed and then an 1024 * open auth is attempted. 1025 */ 1026 if (ni->ni_challenge != NULL) { 1027 FREE(ni->ni_challenge, M_80211_NODE); 1028 ni->ni_challenge = NULL; 1029 } 1030 /* XXX hack to workaround calling convention */ 1031 ieee80211_send_error(ic, ni, wh->i_addr2, 1032 IEEE80211_FC0_SUBTYPE_AUTH, 1033 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 1034 } 1035 return; 1036 } 1037 switch (ic->ic_opmode) { 1038 case IEEE80211_M_IBSS: 1039 case IEEE80211_M_AHDEMO: 1040 case IEEE80211_M_MONITOR: 1041 case IEEE80211_M_WDS: 1042 /* should not come here */ 1043 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1044 ni->ni_macaddr, "open auth", 1045 "bad operating mode %u", ic->ic_opmode); 1046 break; 1047 1048 case IEEE80211_M_HOSTAP: 1049 if (ic->ic_state != IEEE80211_S_RUN || 1050 seq != IEEE80211_AUTH_OPEN_REQUEST) { 1051 ic->ic_stats.is_rx_bad_auth++; 1052 return; 1053 } 1054 /* always accept open authentication requests */ 1055 if (ni == ic->ic_bss) { 1056 ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2); 1057 if (ni == NULL) 1058 return; 1059 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1060 (void) ieee80211_ref_node(ni); 1061 /* 1062 * Mark the node as referenced to reflect that it's 1063 * reference count has been bumped to insure it remains 1064 * after the transaction completes. 1065 */ 1066 ni->ni_flags |= IEEE80211_NODE_AREF; 1067 1068 IEEE80211_SEND_MGMT(ic, ni, 1069 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1070 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1071 "[%s] station authenticated (open)\n", 1072 ether_sprintf(ni->ni_macaddr)); 1073 /* 1074 * When 802.1x is not in use mark the port 1075 * authorized at this point so traffic can flow. 1076 */ 1077 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 1078 ieee80211_node_authorize(ni); 1079 break; 1080 1081 case IEEE80211_M_STA: 1082 if (ic->ic_state != IEEE80211_S_AUTH || 1083 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 1084 ic->ic_stats.is_rx_bad_auth++; 1085 return; 1086 } 1087 if (status != 0) { 1088 IEEE80211_DPRINTF(ic, 1089 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1090 "[%s] open auth failed (reason %d)\n", 1091 ether_sprintf(ni->ni_macaddr), status); 1092 /* XXX can this happen? */ 1093 if (ni != ic->ic_bss) 1094 ni->ni_fails++; 1095 ic->ic_stats.is_rx_auth_fail++; 1096 ieee80211_new_state(ic, IEEE80211_S_SCAN, 1097 IEEE80211_SCAN_FAIL_STATUS); 1098 } else 1099 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 0); 1100 break; 1101 } 1102} 1103 1104/* 1105 * Send a management frame error response to the specified 1106 * station. If ni is associated with the station then use 1107 * it; otherwise allocate a temporary node suitable for 1108 * transmitting the frame and then free the reference so 1109 * it will go away as soon as the frame has been transmitted. 1110 */ 1111static void 1112ieee80211_send_error(struct ieee80211com *ic, struct ieee80211_node *ni, 1113 const uint8_t *mac, int subtype, int arg) 1114{ 1115 int istmp; 1116 1117 if (ni == ic->ic_bss) { 1118 ni = ieee80211_tmp_node(ic, mac); 1119 if (ni == NULL) { 1120 /* XXX msg */ 1121 return; 1122 } 1123 istmp = 1; 1124 } else 1125 istmp = 0; 1126 IEEE80211_SEND_MGMT(ic, ni, subtype, arg); 1127 if (istmp) 1128 ieee80211_free_node(ni); 1129} 1130 1131static int 1132alloc_challenge(struct ieee80211com *ic, struct ieee80211_node *ni) 1133{ 1134 if (ni->ni_challenge == NULL) 1135 MALLOC(ni->ni_challenge, uint32_t*, IEEE80211_CHALLENGE_LEN, 1136 M_80211_NODE, M_NOWAIT); 1137 if (ni->ni_challenge == NULL) { 1138 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1139 "[%s] shared key challenge alloc failed\n", 1140 ether_sprintf(ni->ni_macaddr)); 1141 /* XXX statistic */ 1142 } 1143 return (ni->ni_challenge != NULL); 1144} 1145 1146/* XXX TODO: add statistics */ 1147static void 1148ieee80211_auth_shared(struct ieee80211com *ic, struct ieee80211_frame *wh, 1149 uint8_t *frm, uint8_t *efrm, struct ieee80211_node *ni, 1150 int rssi, int noise, uint32_t rstamp, uint16_t seq, uint16_t status) 1151{ 1152 uint8_t *challenge; 1153 int allocbs, estatus; 1154 1155 /* 1156 * NB: this can happen as we allow pre-shared key 1157 * authentication to be enabled w/o wep being turned 1158 * on so that configuration of these can be done 1159 * in any order. It may be better to enforce the 1160 * ordering in which case this check would just be 1161 * for sanity/consistency. 1162 */ 1163 if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { 1164 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1165 ni->ni_macaddr, "shared key auth", 1166 "%s", " PRIVACY is disabled"); 1167 estatus = IEEE80211_STATUS_ALG; 1168 goto bad; 1169 } 1170 /* 1171 * Pre-shared key authentication is evil; accept 1172 * it only if explicitly configured (it is supported 1173 * mainly for compatibility with clients like OS X). 1174 */ 1175 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1176 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1177 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1178 ni->ni_macaddr, "shared key auth", 1179 "bad sta auth mode %u", ni->ni_authmode); 1180 ic->ic_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1181 estatus = IEEE80211_STATUS_ALG; 1182 goto bad; 1183 } 1184 1185 challenge = NULL; 1186 if (frm + 1 < efrm) { 1187 if ((frm[1] + 2) > (efrm - frm)) { 1188 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1189 ni->ni_macaddr, "shared key auth", 1190 "ie %d/%d too long", 1191 frm[0], (frm[1] + 2) - (efrm - frm)); 1192 ic->ic_stats.is_rx_bad_auth++; 1193 estatus = IEEE80211_STATUS_CHALLENGE; 1194 goto bad; 1195 } 1196 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1197 challenge = frm; 1198 frm += frm[1] + 2; 1199 } 1200 switch (seq) { 1201 case IEEE80211_AUTH_SHARED_CHALLENGE: 1202 case IEEE80211_AUTH_SHARED_RESPONSE: 1203 if (challenge == NULL) { 1204 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1205 ni->ni_macaddr, "shared key auth", 1206 "%s", "no challenge"); 1207 ic->ic_stats.is_rx_bad_auth++; 1208 estatus = IEEE80211_STATUS_CHALLENGE; 1209 goto bad; 1210 } 1211 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1212 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1213 ni->ni_macaddr, "shared key auth", 1214 "bad challenge len %d", challenge[1]); 1215 ic->ic_stats.is_rx_bad_auth++; 1216 estatus = IEEE80211_STATUS_CHALLENGE; 1217 goto bad; 1218 } 1219 default: 1220 break; 1221 } 1222 switch (ic->ic_opmode) { 1223 case IEEE80211_M_MONITOR: 1224 case IEEE80211_M_AHDEMO: 1225 case IEEE80211_M_IBSS: 1226 case IEEE80211_M_WDS: 1227 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1228 ni->ni_macaddr, "shared key auth", 1229 "bad operating mode %u", ic->ic_opmode); 1230 return; 1231 case IEEE80211_M_HOSTAP: 1232 if (ic->ic_state != IEEE80211_S_RUN) { 1233 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1234 ni->ni_macaddr, "shared key auth", 1235 "bad state %u", ic->ic_state); 1236 estatus = IEEE80211_STATUS_ALG; /* XXX */ 1237 goto bad; 1238 } 1239 switch (seq) { 1240 case IEEE80211_AUTH_SHARED_REQUEST: 1241 if (ni == ic->ic_bss) { 1242 ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2); 1243 if (ni == NULL) { 1244 /* NB: no way to return an error */ 1245 return; 1246 } 1247 allocbs = 1; 1248 } else { 1249 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1250 (void) ieee80211_ref_node(ni); 1251 allocbs = 0; 1252 } 1253 /* 1254 * Mark the node as referenced to reflect that it's 1255 * reference count has been bumped to insure it remains 1256 * after the transaction completes. 1257 */ 1258 ni->ni_flags |= IEEE80211_NODE_AREF; 1259 ni->ni_rssi = rssi; 1260 ni->ni_noise = noise; 1261 ni->ni_rstamp = rstamp; 1262 if (!alloc_challenge(ic, ni)) { 1263 /* NB: don't return error so they rexmit */ 1264 return; 1265 } 1266 get_random_bytes(ni->ni_challenge, 1267 IEEE80211_CHALLENGE_LEN); 1268 IEEE80211_DPRINTF(ic, 1269 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1270 "[%s] shared key %sauth request\n", 1271 ether_sprintf(ni->ni_macaddr), 1272 allocbs ? "" : "re"); 1273 break; 1274 case IEEE80211_AUTH_SHARED_RESPONSE: 1275 if (ni == ic->ic_bss) { 1276 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1277 ni->ni_macaddr, "shared key response", 1278 "%s", "unknown station"); 1279 /* NB: don't send a response */ 1280 return; 1281 } 1282 if (ni->ni_challenge == NULL) { 1283 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1284 ni->ni_macaddr, "shared key response", 1285 "%s", "no challenge recorded"); 1286 ic->ic_stats.is_rx_bad_auth++; 1287 estatus = IEEE80211_STATUS_CHALLENGE; 1288 goto bad; 1289 } 1290 if (memcmp(ni->ni_challenge, &challenge[2], 1291 challenge[1]) != 0) { 1292 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1293 ni->ni_macaddr, "shared key response", 1294 "%s", "challenge mismatch"); 1295 ic->ic_stats.is_rx_auth_fail++; 1296 estatus = IEEE80211_STATUS_CHALLENGE; 1297 goto bad; 1298 } 1299 IEEE80211_DPRINTF(ic, 1300 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1301 "[%s] station authenticated (shared key)\n", 1302 ether_sprintf(ni->ni_macaddr)); 1303 ieee80211_node_authorize(ni); 1304 break; 1305 default: 1306 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1307 ni->ni_macaddr, "shared key auth", 1308 "bad seq %d", seq); 1309 ic->ic_stats.is_rx_bad_auth++; 1310 estatus = IEEE80211_STATUS_SEQUENCE; 1311 goto bad; 1312 } 1313 IEEE80211_SEND_MGMT(ic, ni, 1314 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1315 break; 1316 1317 case IEEE80211_M_STA: 1318 if (ic->ic_state != IEEE80211_S_AUTH) 1319 return; 1320 switch (seq) { 1321 case IEEE80211_AUTH_SHARED_PASS: 1322 if (ni->ni_challenge != NULL) { 1323 FREE(ni->ni_challenge, M_80211_NODE); 1324 ni->ni_challenge = NULL; 1325 } 1326 if (status != 0) { 1327 IEEE80211_DPRINTF(ic, 1328 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1329 "[%s] shared key auth failed (reason %d)\n", 1330 ether_sprintf(ieee80211_getbssid(ic, wh)), 1331 status); 1332 /* XXX can this happen? */ 1333 if (ni != ic->ic_bss) 1334 ni->ni_fails++; 1335 ic->ic_stats.is_rx_auth_fail++; 1336 return; 1337 } 1338 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 0); 1339 break; 1340 case IEEE80211_AUTH_SHARED_CHALLENGE: 1341 if (!alloc_challenge(ic, ni)) 1342 return; 1343 /* XXX could optimize by passing recvd challenge */ 1344 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1345 IEEE80211_SEND_MGMT(ic, ni, 1346 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1347 break; 1348 default: 1349 IEEE80211_DISCARD(ic, IEEE80211_MSG_AUTH, 1350 wh, "shared key auth", "bad seq %d", seq); 1351 ic->ic_stats.is_rx_bad_auth++; 1352 return; 1353 } 1354 break; 1355 } 1356 return; 1357bad: 1358 /* 1359 * Send an error response; but only when operating as an AP. 1360 */ 1361 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 1362 /* XXX hack to workaround calling convention */ 1363 ieee80211_send_error(ic, ni, wh->i_addr2, 1364 IEEE80211_FC0_SUBTYPE_AUTH, 1365 (seq + 1) | (estatus<<16)); 1366 } else if (ic->ic_opmode == IEEE80211_M_STA) { 1367 /* 1368 * Kick the state machine. This short-circuits 1369 * using the mgt frame timeout to trigger the 1370 * state transition. 1371 */ 1372 if (ic->ic_state == IEEE80211_S_AUTH) 1373 ieee80211_new_state(ic, IEEE80211_S_SCAN, 1374 IEEE80211_SCAN_FAIL_STATUS); 1375 } 1376} 1377 1378/* Verify the existence and length of __elem or get out. */ 1379#define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen) do { \ 1380 if ((__elem) == NULL) { \ 1381 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ 1382 wh, ieee80211_mgt_subtype_name[subtype >> \ 1383 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1384 "%s", "no " #__elem ); \ 1385 ic->ic_stats.is_rx_elem_missing++; \ 1386 return; \ 1387 } \ 1388 if ((__elem)[1] > (__maxlen)) { \ 1389 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ 1390 wh, ieee80211_mgt_subtype_name[subtype >> \ 1391 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1392 "bad " #__elem " len %d", (__elem)[1]); \ 1393 ic->ic_stats.is_rx_elem_toobig++; \ 1394 return; \ 1395 } \ 1396} while (0) 1397 1398#define IEEE80211_VERIFY_LENGTH(_len, _minlen, _action) do { \ 1399 if ((_len) < (_minlen)) { \ 1400 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ 1401 wh, ieee80211_mgt_subtype_name[subtype >> \ 1402 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1403 "ie too short, got %d, expected %d", \ 1404 (_len), (_minlen)); \ 1405 ic->ic_stats.is_rx_elem_toosmall++; \ 1406 _action; \ 1407 } \ 1408} while (0) 1409 1410#ifdef IEEE80211_DEBUG 1411static void 1412ieee80211_ssid_mismatch(struct ieee80211com *ic, const char *tag, 1413 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 1414{ 1415 printf("[%s] discard %s frame, ssid mismatch: ", 1416 ether_sprintf(mac), tag); 1417 ieee80211_print_essid(ssid + 2, ssid[1]); 1418 printf("\n"); 1419} 1420 1421#define IEEE80211_VERIFY_SSID(_ni, _ssid) do { \ 1422 if ((_ssid)[1] != 0 && \ 1423 ((_ssid)[1] != (_ni)->ni_esslen || \ 1424 memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \ 1425 if (ieee80211_msg_input(ic)) \ 1426 ieee80211_ssid_mismatch(ic, \ 1427 ieee80211_mgt_subtype_name[subtype >> \ 1428 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1429 wh->i_addr2, _ssid); \ 1430 ic->ic_stats.is_rx_ssidmismatch++; \ 1431 return; \ 1432 } \ 1433} while (0) 1434#else /* !IEEE80211_DEBUG */ 1435#define IEEE80211_VERIFY_SSID(_ni, _ssid) do { \ 1436 if ((_ssid)[1] != 0 && \ 1437 ((_ssid)[1] != (_ni)->ni_esslen || \ 1438 memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \ 1439 ic->ic_stats.is_rx_ssidmismatch++; \ 1440 return; \ 1441 } \ 1442} while (0) 1443#endif /* !IEEE80211_DEBUG */ 1444 1445/* unalligned little endian access */ 1446#define LE_READ_2(p) \ 1447 ((uint16_t) \ 1448 ((((const uint8_t *)(p))[0] ) | \ 1449 (((const uint8_t *)(p))[1] << 8))) 1450#define LE_READ_4(p) \ 1451 ((uint32_t) \ 1452 ((((const uint8_t *)(p))[0] ) | \ 1453 (((const uint8_t *)(p))[1] << 8) | \ 1454 (((const uint8_t *)(p))[2] << 16) | \ 1455 (((const uint8_t *)(p))[3] << 24))) 1456 1457static __inline int 1458iswpaoui(const uint8_t *frm) 1459{ 1460 return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI); 1461} 1462 1463static __inline int 1464iswmeoui(const uint8_t *frm) 1465{ 1466 return frm[1] > 3 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI); 1467} 1468 1469static __inline int 1470iswmeparam(const uint8_t *frm) 1471{ 1472 return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) && 1473 frm[6] == WME_PARAM_OUI_SUBTYPE; 1474} 1475 1476static __inline int 1477iswmeinfo(const uint8_t *frm) 1478{ 1479 return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) && 1480 frm[6] == WME_INFO_OUI_SUBTYPE; 1481} 1482 1483static __inline int 1484isatherosoui(const uint8_t *frm) 1485{ 1486 return frm[1] > 3 && LE_READ_4(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI); 1487} 1488 1489static __inline int 1490ishtcapoui(const uint8_t *frm) 1491{ 1492 return frm[1] > 3 && LE_READ_4(frm+2) == ((BCM_OUI_HTCAP<<24)|BCM_OUI); 1493} 1494 1495static __inline int 1496ishtinfooui(const uint8_t *frm) 1497{ 1498 return frm[1] > 3 && LE_READ_4(frm+2) == ((BCM_OUI_HTINFO<<24)|BCM_OUI); 1499} 1500 1501/* 1502 * Convert a WPA cipher selector OUI to an internal 1503 * cipher algorithm. Where appropriate we also 1504 * record any key length. 1505 */ 1506static int 1507wpa_cipher(uint8_t *sel, uint8_t *keylen) 1508{ 1509#define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1510 uint32_t w = LE_READ_4(sel); 1511 1512 switch (w) { 1513 case WPA_SEL(WPA_CSE_NULL): 1514 return IEEE80211_CIPHER_NONE; 1515 case WPA_SEL(WPA_CSE_WEP40): 1516 if (keylen) 1517 *keylen = 40 / NBBY; 1518 return IEEE80211_CIPHER_WEP; 1519 case WPA_SEL(WPA_CSE_WEP104): 1520 if (keylen) 1521 *keylen = 104 / NBBY; 1522 return IEEE80211_CIPHER_WEP; 1523 case WPA_SEL(WPA_CSE_TKIP): 1524 return IEEE80211_CIPHER_TKIP; 1525 case WPA_SEL(WPA_CSE_CCMP): 1526 return IEEE80211_CIPHER_AES_CCM; 1527 } 1528 return 32; /* NB: so 1<< is discarded */ 1529#undef WPA_SEL 1530} 1531 1532/* 1533 * Convert a WPA key management/authentication algorithm 1534 * to an internal code. 1535 */ 1536static int 1537wpa_keymgmt(uint8_t *sel) 1538{ 1539#define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1540 uint32_t w = LE_READ_4(sel); 1541 1542 switch (w) { 1543 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1544 return WPA_ASE_8021X_UNSPEC; 1545 case WPA_SEL(WPA_ASE_8021X_PSK): 1546 return WPA_ASE_8021X_PSK; 1547 case WPA_SEL(WPA_ASE_NONE): 1548 return WPA_ASE_NONE; 1549 } 1550 return 0; /* NB: so is discarded */ 1551#undef WPA_SEL 1552} 1553 1554/* 1555 * Parse a WPA information element to collect parameters 1556 * and validate the parameters against what has been 1557 * configured for the system. 1558 */ 1559static int 1560ieee80211_parse_wpa(struct ieee80211com *ic, uint8_t *frm, 1561 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1562{ 1563 uint8_t len = frm[1]; 1564 uint32_t w; 1565 int n; 1566 1567 /* 1568 * Check the length once for fixed parts: OUI, type, 1569 * version, mcast cipher, and 2 selector counts. 1570 * Other, variable-length data, must be checked separately. 1571 */ 1572 if ((ic->ic_flags & IEEE80211_F_WPA1) == 0) { 1573 IEEE80211_DISCARD_IE(ic, 1574 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1575 wh, "WPA", "not WPA, flags 0x%x", ic->ic_flags); 1576 return IEEE80211_REASON_IE_INVALID; 1577 } 1578 if (len < 14) { 1579 IEEE80211_DISCARD_IE(ic, 1580 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1581 wh, "WPA", "too short, len %u", len); 1582 return IEEE80211_REASON_IE_INVALID; 1583 } 1584 frm += 6, len -= 4; /* NB: len is payload only */ 1585 /* NB: iswapoui already validated the OUI and type */ 1586 w = LE_READ_2(frm); 1587 if (w != WPA_VERSION) { 1588 IEEE80211_DISCARD_IE(ic, 1589 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1590 wh, "WPA", "bad version %u", w); 1591 return IEEE80211_REASON_IE_INVALID; 1592 } 1593 frm += 2, len -= 2; 1594 1595 /* multicast/group cipher */ 1596 w = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1597 if (w != rsn->rsn_mcastcipher) { 1598 IEEE80211_DISCARD_IE(ic, 1599 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1600 wh, "WPA", "mcast cipher mismatch; got %u, expected %u", 1601 w, rsn->rsn_mcastcipher); 1602 return IEEE80211_REASON_IE_INVALID; 1603 } 1604 frm += 4, len -= 4; 1605 1606 /* unicast ciphers */ 1607 n = LE_READ_2(frm); 1608 frm += 2, len -= 2; 1609 if (len < n*4+2) { 1610 IEEE80211_DISCARD_IE(ic, 1611 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1612 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1613 len, n); 1614 return IEEE80211_REASON_IE_INVALID; 1615 } 1616 w = 0; 1617 for (; n > 0; n--) { 1618 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1619 frm += 4, len -= 4; 1620 } 1621 w &= rsn->rsn_ucastcipherset; 1622 if (w == 0) { 1623 IEEE80211_DISCARD_IE(ic, 1624 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1625 wh, "WPA", "%s", "ucast cipher set empty"); 1626 return IEEE80211_REASON_IE_INVALID; 1627 } 1628 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1629 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1630 else 1631 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1632 1633 /* key management algorithms */ 1634 n = LE_READ_2(frm); 1635 frm += 2, len -= 2; 1636 if (len < n*4) { 1637 IEEE80211_DISCARD_IE(ic, 1638 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1639 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1640 len, n); 1641 return IEEE80211_REASON_IE_INVALID; 1642 } 1643 w = 0; 1644 for (; n > 0; n--) { 1645 w |= wpa_keymgmt(frm); 1646 frm += 4, len -= 4; 1647 } 1648 w &= rsn->rsn_keymgmtset; 1649 if (w == 0) { 1650 IEEE80211_DISCARD_IE(ic, 1651 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1652 wh, "WPA", "%s", "no acceptable key mgmt alg"); 1653 return IEEE80211_REASON_IE_INVALID; 1654 } 1655 if (w & WPA_ASE_8021X_UNSPEC) 1656 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1657 else 1658 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1659 1660 if (len > 2) /* optional capabilities */ 1661 rsn->rsn_caps = LE_READ_2(frm); 1662 1663 return 0; 1664} 1665 1666/* 1667 * Convert an RSN cipher selector OUI to an internal 1668 * cipher algorithm. Where appropriate we also 1669 * record any key length. 1670 */ 1671static int 1672rsn_cipher(uint8_t *sel, uint8_t *keylen) 1673{ 1674#define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1675 uint32_t w = LE_READ_4(sel); 1676 1677 switch (w) { 1678 case RSN_SEL(RSN_CSE_NULL): 1679 return IEEE80211_CIPHER_NONE; 1680 case RSN_SEL(RSN_CSE_WEP40): 1681 if (keylen) 1682 *keylen = 40 / NBBY; 1683 return IEEE80211_CIPHER_WEP; 1684 case RSN_SEL(RSN_CSE_WEP104): 1685 if (keylen) 1686 *keylen = 104 / NBBY; 1687 return IEEE80211_CIPHER_WEP; 1688 case RSN_SEL(RSN_CSE_TKIP): 1689 return IEEE80211_CIPHER_TKIP; 1690 case RSN_SEL(RSN_CSE_CCMP): 1691 return IEEE80211_CIPHER_AES_CCM; 1692 case RSN_SEL(RSN_CSE_WRAP): 1693 return IEEE80211_CIPHER_AES_OCB; 1694 } 1695 return 32; /* NB: so 1<< is discarded */ 1696#undef WPA_SEL 1697} 1698 1699/* 1700 * Convert an RSN key management/authentication algorithm 1701 * to an internal code. 1702 */ 1703static int 1704rsn_keymgmt(uint8_t *sel) 1705{ 1706#define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1707 uint32_t w = LE_READ_4(sel); 1708 1709 switch (w) { 1710 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1711 return RSN_ASE_8021X_UNSPEC; 1712 case RSN_SEL(RSN_ASE_8021X_PSK): 1713 return RSN_ASE_8021X_PSK; 1714 case RSN_SEL(RSN_ASE_NONE): 1715 return RSN_ASE_NONE; 1716 } 1717 return 0; /* NB: so is discarded */ 1718#undef RSN_SEL 1719} 1720 1721/* 1722 * Parse a WPA/RSN information element to collect parameters 1723 * and validate the parameters against what has been 1724 * configured for the system. 1725 */ 1726static int 1727ieee80211_parse_rsn(struct ieee80211com *ic, uint8_t *frm, 1728 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1729{ 1730 uint8_t len = frm[1]; 1731 uint32_t w; 1732 int n; 1733 1734 /* 1735 * Check the length once for fixed parts: 1736 * version, mcast cipher, and 2 selector counts. 1737 * Other, variable-length data, must be checked separately. 1738 */ 1739 if ((ic->ic_flags & IEEE80211_F_WPA2) == 0) { 1740 IEEE80211_DISCARD_IE(ic, 1741 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1742 wh, "WPA", "not RSN, flags 0x%x", ic->ic_flags); 1743 return IEEE80211_REASON_IE_INVALID; 1744 } 1745 if (len < 10) { 1746 IEEE80211_DISCARD_IE(ic, 1747 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1748 wh, "RSN", "too short, len %u", len); 1749 return IEEE80211_REASON_IE_INVALID; 1750 } 1751 frm += 2; 1752 w = LE_READ_2(frm); 1753 if (w != RSN_VERSION) { 1754 IEEE80211_DISCARD_IE(ic, 1755 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1756 wh, "RSN", "bad version %u", w); 1757 return IEEE80211_REASON_IE_INVALID; 1758 } 1759 frm += 2, len -= 2; 1760 1761 /* multicast/group cipher */ 1762 w = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1763 if (w != rsn->rsn_mcastcipher) { 1764 IEEE80211_DISCARD_IE(ic, 1765 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1766 wh, "RSN", "mcast cipher mismatch; got %u, expected %u", 1767 w, rsn->rsn_mcastcipher); 1768 return IEEE80211_REASON_IE_INVALID; 1769 } 1770 frm += 4, len -= 4; 1771 1772 /* unicast ciphers */ 1773 n = LE_READ_2(frm); 1774 frm += 2, len -= 2; 1775 if (len < n*4+2) { 1776 IEEE80211_DISCARD_IE(ic, 1777 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1778 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1779 len, n); 1780 return IEEE80211_REASON_IE_INVALID; 1781 } 1782 w = 0; 1783 for (; n > 0; n--) { 1784 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1785 frm += 4, len -= 4; 1786 } 1787 w &= rsn->rsn_ucastcipherset; 1788 if (w == 0) { 1789 IEEE80211_DISCARD_IE(ic, 1790 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1791 wh, "RSN", "%s", "ucast cipher set empty"); 1792 return IEEE80211_REASON_IE_INVALID; 1793 } 1794 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1795 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1796 else 1797 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1798 1799 /* key management algorithms */ 1800 n = LE_READ_2(frm); 1801 frm += 2, len -= 2; 1802 if (len < n*4) { 1803 IEEE80211_DISCARD_IE(ic, 1804 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1805 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1806 len, n); 1807 return IEEE80211_REASON_IE_INVALID; 1808 } 1809 w = 0; 1810 for (; n > 0; n--) { 1811 w |= rsn_keymgmt(frm); 1812 frm += 4, len -= 4; 1813 } 1814 w &= rsn->rsn_keymgmtset; 1815 if (w == 0) { 1816 IEEE80211_DISCARD_IE(ic, 1817 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1818 wh, "RSN", "%s", "no acceptable key mgmt alg"); 1819 return IEEE80211_REASON_IE_INVALID; 1820 } 1821 if (w & RSN_ASE_8021X_UNSPEC) 1822 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1823 else 1824 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1825 1826 /* optional RSN capabilities */ 1827 if (len > 2) 1828 rsn->rsn_caps = LE_READ_2(frm); 1829 /* XXXPMKID */ 1830 1831 return 0; 1832} 1833 1834static int 1835ieee80211_parse_wmeparams(struct ieee80211com *ic, uint8_t *frm, 1836 const struct ieee80211_frame *wh) 1837{ 1838#define MS(_v, _f) (((_v) & _f) >> _f##_S) 1839 struct ieee80211_wme_state *wme = &ic->ic_wme; 1840 u_int len = frm[1], qosinfo; 1841 int i; 1842 1843 if (len < sizeof(struct ieee80211_wme_param)-2) { 1844 IEEE80211_DISCARD_IE(ic, 1845 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1846 wh, "WME", "too short, len %u", len); 1847 return -1; 1848 } 1849 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1850 qosinfo &= WME_QOSINFO_COUNT; 1851 /* XXX do proper check for wraparound */ 1852 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1853 return 0; 1854 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1855 for (i = 0; i < WME_NUM_AC; i++) { 1856 struct wmeParams *wmep = 1857 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1858 /* NB: ACI not used */ 1859 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1860 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1861 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1862 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1863 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1864 frm += 4; 1865 } 1866 wme->wme_wmeChanParams.cap_info = qosinfo; 1867 return 1; 1868#undef MS 1869} 1870 1871static int 1872ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm, 1873 const struct ieee80211_frame *wh) 1874{ 1875 struct ieee80211com *ic = ni->ni_ic; 1876 const struct ieee80211_ath_ie *ath; 1877 u_int len = frm[1]; 1878 int capschanged; 1879 uint16_t defkeyix; 1880 1881 if (len < sizeof(struct ieee80211_ath_ie)-2) { 1882 IEEE80211_DISCARD_IE(ic, 1883 IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG, 1884 wh, "Atheros", "too short, len %u", len); 1885 return -1; 1886 } 1887 ath = (const struct ieee80211_ath_ie *)frm; 1888 capschanged = (ni->ni_ath_flags != ath->ath_capability); 1889 defkeyix = LE_READ_2(ath->ath_defkeyix); 1890 if (capschanged || defkeyix != ni->ni_ath_defkeyix) { 1891 ni->ni_ath_flags = ath->ath_capability; 1892 ni->ni_ath_defkeyix = defkeyix; 1893 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SUPERG, 1894 "[%s] ath ie change: new caps 0x%x defkeyix 0x%x\n", 1895 ether_sprintf(ni->ni_macaddr), 1896 ni->ni_ath_flags, ni->ni_ath_defkeyix); 1897 } 1898 if (IEEE80211_ATH_CAP(ic, ni, ATHEROS_CAP_TURBO_PRIME)) { 1899 uint16_t curflags, newflags; 1900 1901 /* 1902 * Check for turbo mode switch. Calculate flags 1903 * for the new mode and effect the switch. 1904 */ 1905 newflags = curflags = ic->ic_bsschan->ic_flags; 1906 /* NB: BOOST is not in ic_flags, so get it from the ie */ 1907 if (ath->ath_capability & ATHEROS_CAP_BOOST) 1908 newflags |= IEEE80211_CHAN_TURBO; 1909 else 1910 newflags &= ~IEEE80211_CHAN_TURBO; 1911 if (newflags != curflags) 1912 ieee80211_dturbo_switch(ic, newflags); 1913 } 1914 return capschanged; 1915} 1916 1917void 1918ieee80211_saveath(struct ieee80211_node *ni, uint8_t *ie) 1919{ 1920 const struct ieee80211_ath_ie *ath = 1921 (const struct ieee80211_ath_ie *) ie; 1922 1923 ni->ni_ath_flags = ath->ath_capability; 1924 ni->ni_ath_defkeyix = LE_READ_2(&ath->ath_defkeyix); 1925 ieee80211_saveie(&ni->ni_ath_ie, ie); 1926} 1927 1928void 1929ieee80211_saveie(uint8_t **iep, const uint8_t *ie) 1930{ 1931 u_int ielen = ie[1]+2; 1932 /* 1933 * Record information element for later use. 1934 */ 1935 if (*iep == NULL || (*iep)[1] != ie[1]) { 1936 if (*iep != NULL) 1937 FREE(*iep, M_80211_NODE); 1938 MALLOC(*iep, void*, ielen, M_80211_NODE, M_NOWAIT); 1939 } 1940 if (*iep != NULL) 1941 memcpy(*iep, ie, ielen); 1942 /* XXX note failure */ 1943} 1944 1945/* XXX find a better place for definition */ 1946struct l2_update_frame { 1947 struct ether_header eh; 1948 uint8_t dsap; 1949 uint8_t ssap; 1950 uint8_t control; 1951 uint8_t xid[3]; 1952} __packed; 1953 1954/* 1955 * Deliver a TGf L2UF frame on behalf of a station. 1956 * This primes any bridge when the station is roaming 1957 * between ap's on the same wired network. 1958 */ 1959static void 1960ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1961{ 1962 struct ieee80211com *ic = ni->ni_ic; 1963 struct ifnet *ifp = ic->ic_ifp; 1964 struct mbuf *m; 1965 struct l2_update_frame *l2uf; 1966 struct ether_header *eh; 1967 1968 m = m_gethdr(M_NOWAIT, MT_DATA); 1969 if (m == NULL) { 1970 IEEE80211_NOTE(ic, IEEE80211_MSG_ASSOC, ni, 1971 "%s", "no mbuf for l2uf frame"); 1972 ic->ic_stats.is_rx_nobuf++; /* XXX not right */ 1973 return; 1974 } 1975 l2uf = mtod(m, struct l2_update_frame *); 1976 eh = &l2uf->eh; 1977 /* dst: Broadcast address */ 1978 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1979 /* src: associated STA */ 1980 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1981 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1982 1983 l2uf->dsap = 0; 1984 l2uf->ssap = 0; 1985 l2uf->control = 0xf5; 1986 l2uf->xid[0] = 0x81; 1987 l2uf->xid[1] = 0x80; 1988 l2uf->xid[2] = 0x00; 1989 1990 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1991 ieee80211_deliver_data(ic, ni, m); 1992} 1993 1994static __inline int 1995contbgscan(struct ieee80211com *ic) 1996{ 1997 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1998 time_after(ticks, ic->ic_lastdata + ic->ic_bgscanidle)); 1999} 2000 2001static __inline int 2002startbgscan(struct ieee80211com *ic) 2003{ 2004 return ((ic->ic_flags & IEEE80211_F_BGSCAN) && 2005 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 2006 time_after(ticks, ic->ic_lastscan + ic->ic_bgscanintvl) && 2007 time_after(ticks, ic->ic_lastdata + ic->ic_bgscanidle)); 2008} 2009 2010static void 2011ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 2012 int reassoc, int resp, const char *tag, int rate) 2013{ 2014 struct ieee80211com *ic = ni->ni_ic; 2015 2016 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 2017 "[%s] deny %s request, %s rate set mismatch, rate 0x%x\n", 2018 ether_sprintf(wh->i_addr2), 2019 reassoc ? "reassoc" : "assoc", tag, rate); 2020 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_BASIC_RATE); 2021 ieee80211_node_leave(ic, ni); 2022 ic->ic_stats.is_rx_assoc_norate++; 2023} 2024 2025static void 2026capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 2027 int reassoc, int resp, const char *tag, int capinfo) 2028{ 2029 struct ieee80211com *ic = ni->ni_ic; 2030 2031 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 2032 "[%s] deny %s request, %s mismatch 0x%x\n", 2033 ether_sprintf(wh->i_addr2), 2034 reassoc ? "reassoc" : "assoc", tag, capinfo); 2035 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_CAPINFO); 2036 ieee80211_node_leave(ic, ni); 2037 ic->ic_stats.is_rx_assoc_capmismatch++; 2038} 2039 2040void 2041ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0, 2042 struct ieee80211_node *ni, 2043 int subtype, int rssi, int noise, uint32_t rstamp) 2044{ 2045#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 2046#define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 2047 struct ieee80211_frame *wh; 2048 uint8_t *frm, *efrm; 2049 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 2050 int reassoc, resp, allocbs; 2051 uint8_t rate; 2052 2053 wh = mtod(m0, struct ieee80211_frame *); 2054 frm = (uint8_t *)&wh[1]; 2055 efrm = mtod(m0, uint8_t *) + m0->m_len; 2056 switch (subtype) { 2057 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 2058 case IEEE80211_FC0_SUBTYPE_BEACON: { 2059 struct ieee80211_scanparams scan; 2060 2061 /* 2062 * We process beacon/probe response frames: 2063 * o when scanning, or 2064 * o station mode when associated (to collect state 2065 * updates such as 802.11g slot time), or 2066 * o adhoc mode (to discover neighbors) 2067 * Frames otherwise received are discarded. 2068 */ 2069 if (!((ic->ic_flags & IEEE80211_F_SCAN) || 2070 (ic->ic_opmode == IEEE80211_M_STA && ni->ni_associd) || 2071 ic->ic_opmode == IEEE80211_M_IBSS)) { 2072 ic->ic_stats.is_rx_mgtdiscard++; 2073 return; 2074 } 2075 /* 2076 * beacon/probe response frame format 2077 * [8] time stamp 2078 * [2] beacon interval 2079 * [2] capability information 2080 * [tlv] ssid 2081 * [tlv] supported rates 2082 * [tlv] country information 2083 * [tlv] parameter set (FH/DS) 2084 * [tlv] erp information 2085 * [tlv] extended supported rates 2086 * [tlv] WME 2087 * [tlv] WPA or RSN 2088 * [tlv] HT capabilities 2089 * [tlv] HT information 2090 * [tlv] Atheros capabilities 2091 */ 2092 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, return); 2093 memset(&scan, 0, sizeof(scan)); 2094 scan.tstamp = frm; frm += 8; 2095 scan.bintval = le16toh(*(uint16_t *)frm); frm += 2; 2096 scan.capinfo = le16toh(*(uint16_t *)frm); frm += 2; 2097 scan.bchan = IEEE80211_CHAN2IEEE(ic->ic_curchan); 2098 scan.curchan = ic->ic_curchan; 2099 2100 while (efrm - frm > 1) { 2101 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 2102 switch (*frm) { 2103 case IEEE80211_ELEMID_SSID: 2104 scan.ssid = frm; 2105 break; 2106 case IEEE80211_ELEMID_RATES: 2107 scan.rates = frm; 2108 break; 2109 case IEEE80211_ELEMID_COUNTRY: 2110 scan.country = frm; 2111 break; 2112 case IEEE80211_ELEMID_FHPARMS: 2113 if (ic->ic_phytype == IEEE80211_T_FH) { 2114 scan.fhdwell = LE_READ_2(&frm[2]); 2115 scan.bchan = IEEE80211_FH_CHAN(frm[4], frm[5]); 2116 scan.fhindex = frm[6]; 2117 } 2118 break; 2119 case IEEE80211_ELEMID_DSPARMS: 2120 /* 2121 * XXX hack this since depending on phytype 2122 * is problematic for multi-mode devices. 2123 */ 2124 if (ic->ic_phytype != IEEE80211_T_FH) 2125 scan.bchan = frm[2]; 2126 break; 2127 case IEEE80211_ELEMID_TIM: 2128 /* XXX ATIM? */ 2129 scan.tim = frm; 2130 scan.timoff = frm - mtod(m0, uint8_t *); 2131 break; 2132 case IEEE80211_ELEMID_IBSSPARMS: 2133 break; 2134 case IEEE80211_ELEMID_XRATES: 2135 scan.xrates = frm; 2136 break; 2137 case IEEE80211_ELEMID_ERP: 2138 if (frm[1] != 1) { 2139 IEEE80211_DISCARD_IE(ic, 2140 IEEE80211_MSG_ELEMID, wh, "ERP", 2141 "bad len %u", frm[1]); 2142 ic->ic_stats.is_rx_elem_toobig++; 2143 break; 2144 } 2145 scan.erp = frm[2]; 2146 break; 2147 case IEEE80211_ELEMID_HTCAP: 2148 scan.htcap = frm; 2149 break; 2150 case IEEE80211_ELEMID_RSN: 2151 scan.rsn = frm; 2152 break; 2153 case IEEE80211_ELEMID_HTINFO: 2154 scan.htinfo = frm; 2155 break; 2156 case IEEE80211_ELEMID_VENDOR: 2157 if (iswpaoui(frm)) 2158 scan.wpa = frm; 2159 else if (iswmeparam(frm) || iswmeinfo(frm)) 2160 scan.wme = frm; 2161 else if (isatherosoui(frm)) 2162 scan.ath = frm; 2163 else if (ic->ic_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 2164 /* 2165 * Accept pre-draft HT ie's if the 2166 * standard ones have not been seen. 2167 */ 2168 if (ishtcapoui(frm)) { 2169 if (scan.htcap == NULL) 2170 scan.htcap = frm; 2171 } else if (ishtinfooui(frm)) { 2172 if (scan.htinfo == NULL) 2173 scan.htcap = frm; 2174 } 2175 } 2176 break; 2177 default: 2178 IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID, 2179 wh, "unhandled", 2180 "id %u, len %u", *frm, frm[1]); 2181 ic->ic_stats.is_rx_elem_unknown++; 2182 break; 2183 } 2184 frm += frm[1] + 2; 2185 } 2186 IEEE80211_VERIFY_ELEMENT(scan.rates, IEEE80211_RATE_MAXSIZE); 2187 if (scan.xrates != NULL) 2188 IEEE80211_VERIFY_ELEMENT(scan.xrates, 2189 IEEE80211_RATE_MAXSIZE - scan.rates[1]); 2190 IEEE80211_VERIFY_ELEMENT(scan.ssid, IEEE80211_NWID_LEN); 2191#if IEEE80211_CHAN_MAX < 255 2192 if (scan.chan > IEEE80211_CHAN_MAX) { 2193 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, 2194 wh, ieee80211_mgt_subtype_name[subtype >> 2195 IEEE80211_FC0_SUBTYPE_SHIFT], 2196 "invalid channel %u", scan.chan); 2197 ic->ic_stats.is_rx_badchan++; 2198 return; 2199 } 2200#endif 2201 if (IEEE80211_CHAN2IEEE(scan.curchan) != scan.bchan && 2202 ic->ic_phytype != IEEE80211_T_FH) { 2203 /* 2204 * Frame was received on a channel different from the 2205 * one indicated in the DS params element id; 2206 * silently discard it. 2207 * 2208 * NB: this can happen due to signal leakage. 2209 * But we should take it for FH phy because 2210 * the rssi value should be correct even for 2211 * different hop pattern in FH. 2212 */ 2213 IEEE80211_DISCARD(ic, 2214 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 2215 wh, ieee80211_mgt_subtype_name[subtype >> 2216 IEEE80211_FC0_SUBTYPE_SHIFT], 2217 "for off-channel %u", 2218 IEEE80211_CHAN2IEEE(scan.curchan)); 2219 ic->ic_stats.is_rx_chanmismatch++; 2220 return; 2221 } 2222 if (!(IEEE80211_BINTVAL_MIN <= scan.bintval && 2223 scan.bintval <= IEEE80211_BINTVAL_MAX)) { 2224 IEEE80211_DISCARD(ic, 2225 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 2226 wh, ieee80211_mgt_subtype_name[subtype >> 2227 IEEE80211_FC0_SUBTYPE_SHIFT], 2228 "bogus beacon interval", scan.bintval); 2229 ic->ic_stats.is_rx_badbintval++; 2230 return; 2231 } 2232 /* 2233 * Process HT ie's. This is complicated by our 2234 * accepting both the standard ie's and the pre-draft 2235 * vendor OUI ie's that some vendors still use/require. 2236 */ 2237 if (scan.htcap != NULL) { 2238 IEEE80211_VERIFY_LENGTH(scan.htcap[1], 2239 scan.htcap[0] == IEEE80211_ELEMID_VENDOR ? 2240 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2241 sizeof(struct ieee80211_ie_htcap)-2, 2242 scan.htcap = NULL); 2243 } 2244 if (scan.htinfo != NULL) { 2245 IEEE80211_VERIFY_LENGTH(scan.htinfo[1], 2246 scan.htinfo[0] == IEEE80211_ELEMID_VENDOR ? 2247 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 2248 sizeof(struct ieee80211_ie_htinfo)-2, 2249 scan.htinfo = NULL); 2250 } 2251 2252 /* 2253 * Count frame now that we know it's to be processed. 2254 */ 2255 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 2256 ic->ic_stats.is_rx_beacon++; /* XXX remove */ 2257 IEEE80211_NODE_STAT(ni, rx_beacons); 2258 } else 2259 IEEE80211_NODE_STAT(ni, rx_proberesp); 2260 2261 /* 2262 * When operating in station mode, check for state updates. 2263 * Be careful to ignore beacons received while doing a 2264 * background scan. We consider only 11g/WMM stuff right now. 2265 */ 2266 if (ic->ic_opmode == IEEE80211_M_STA && 2267 ni->ni_associd != 0 && 2268 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 2269 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 2270 /* record tsf of last beacon */ 2271 memcpy(ni->ni_tstamp.data, scan.tstamp, 2272 sizeof(ni->ni_tstamp)); 2273 /* count beacon frame for s/w bmiss handling */ 2274 ic->ic_swbmiss_count++; 2275 ic->ic_bmiss_count = 0; 2276 if (ni->ni_erp != scan.erp) { 2277 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2278 "[%s] erp change: was 0x%x, now 0x%x\n", 2279 ether_sprintf(wh->i_addr2), 2280 ni->ni_erp, scan.erp); 2281 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2282 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 2283 ic->ic_flags |= IEEE80211_F_USEPROT; 2284 else 2285 ic->ic_flags &= ~IEEE80211_F_USEPROT; 2286 ni->ni_erp = scan.erp; 2287 /* XXX statistic */ 2288 } 2289 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 2290 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2291 "[%s] capabilities change: before 0x%x," 2292 " now 0x%x\n", 2293 ether_sprintf(wh->i_addr2), 2294 ni->ni_capinfo, scan.capinfo); 2295 /* 2296 * NB: we assume short preamble doesn't 2297 * change dynamically 2298 */ 2299 ieee80211_set_shortslottime(ic, 2300 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 2301 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 2302 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 2303 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 2304 /* XXX statistic */ 2305 } 2306 if (scan.wme != NULL && 2307 (ni->ni_flags & IEEE80211_NODE_QOS) && 2308 ieee80211_parse_wmeparams(ic, scan.wme, wh) > 0) 2309 ieee80211_wme_updateparams(ic); 2310 if (scan.ath != NULL) 2311 ieee80211_parse_athparams(ni, scan.ath, wh); 2312 if (scan.htcap != NULL) 2313 ieee80211_parse_htcap(ni, scan.htcap); 2314 if (scan.htinfo != NULL) 2315 ieee80211_parse_htinfo(ni, scan.htinfo); 2316 if (scan.tim != NULL) { 2317 struct ieee80211_tim_ie *tim = 2318 (struct ieee80211_tim_ie *) scan.tim; 2319#if 0 2320 int aid = IEEE80211_AID(ni->ni_associd); 2321 int ix = aid / NBBY; 2322 int min = tim->tim_bitctl &~ 1; 2323 int max = tim->tim_len + min - 4; 2324 if ((tim->tim_bitctl&1) || 2325 (min <= ix && ix <= max && 2326 isset(tim->tim_bitmap - min, aid))) { 2327 /* 2328 * XXX Do not let bg scan kick off 2329 * we are expecting data. 2330 */ 2331 ic->ic_lastdata = ticks; 2332 ieee80211_sta_pwrsave(ic, 0); 2333 } 2334#endif 2335 ni->ni_dtim_count = tim->tim_count; 2336 ni->ni_dtim_period = tim->tim_period; 2337 } 2338 /* 2339 * If scanning, pass the info to the scan module. 2340 * Otherwise, check if it's the right time to do 2341 * a background scan. Background scanning must 2342 * be enabled and we must not be operating in the 2343 * turbo phase of dynamic turbo mode. Then, 2344 * it's been a while since the last background 2345 * scan and if no data frames have come through 2346 * recently, kick off a scan. Note that this 2347 * is the mechanism by which a background scan 2348 * is started _and_ continued each time we 2349 * return on-channel to receive a beacon from 2350 * our ap. 2351 */ 2352 if (ic->ic_flags & IEEE80211_F_SCAN) { 2353 ieee80211_add_scan(ic, &scan, wh, 2354 subtype, rssi, noise, rstamp); 2355 } else if (contbgscan(ic)) { 2356 ieee80211_bg_scan(ic); 2357 } else if (startbgscan(ic)) { 2358#if 0 2359 /* wakeup if we are sleeing */ 2360 ieee80211_set_pwrsave(ic, 0); 2361#endif 2362 ieee80211_bg_scan(ic); 2363 } 2364 return; 2365 } 2366 /* 2367 * If scanning, just pass information to the scan module. 2368 */ 2369 if (ic->ic_flags & IEEE80211_F_SCAN) { 2370 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 2371 /* 2372 * Actively scanning a channel marked passive; 2373 * send a probe request now that we know there 2374 * is 802.11 traffic present. 2375 * 2376 * XXX check if the beacon we recv'd gives 2377 * us what we need and suppress the probe req 2378 */ 2379 ieee80211_probe_curchan(ic, 1); 2380 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 2381 } 2382 ieee80211_add_scan(ic, &scan, wh, 2383 subtype, rssi, noise, rstamp); 2384 return; 2385 } 2386 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 2387 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 2388 /* 2389 * Create a new entry in the neighbor table. 2390 */ 2391 ni = ieee80211_add_neighbor(ic, wh, &scan); 2392 } else if (ni->ni_capinfo == 0) { 2393 /* 2394 * Update faked node created on transmit. 2395 * Note this also updates the tsf. 2396 */ 2397 ieee80211_init_neighbor(ni, wh, &scan); 2398 } else { 2399 /* 2400 * Record tsf for potential resync. 2401 */ 2402 memcpy(ni->ni_tstamp.data, scan.tstamp, 2403 sizeof(ni->ni_tstamp)); 2404 } 2405 if (ni != NULL) { 2406 ni->ni_rssi = rssi; 2407 ni->ni_noise = noise; 2408 ni->ni_rstamp = rstamp; 2409 } 2410 } 2411 break; 2412 } 2413 2414 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 2415 if (ic->ic_opmode == IEEE80211_M_STA || 2416 ic->ic_state != IEEE80211_S_RUN) { 2417 ic->ic_stats.is_rx_mgtdiscard++; 2418 return; 2419 } 2420 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 2421 /* frame must be directed */ 2422 ic->ic_stats.is_rx_mgtdiscard++; /* XXX stat */ 2423 return; 2424 } 2425 2426 /* 2427 * prreq frame format 2428 * [tlv] ssid 2429 * [tlv] supported rates 2430 * [tlv] extended supported rates 2431 * [tlv] Atheros capabilities 2432 */ 2433 ssid = rates = xrates = ath = NULL; 2434 while (efrm - frm > 1) { 2435 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 2436 switch (*frm) { 2437 case IEEE80211_ELEMID_SSID: 2438 ssid = frm; 2439 break; 2440 case IEEE80211_ELEMID_RATES: 2441 rates = frm; 2442 break; 2443 case IEEE80211_ELEMID_XRATES: 2444 xrates = frm; 2445 break; 2446 case IEEE80211_ELEMID_VENDOR: 2447 if (isatherosoui(frm)) 2448 ath = frm; 2449 break; 2450 } 2451 frm += frm[1] + 2; 2452 } 2453 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 2454 if (xrates != NULL) 2455 IEEE80211_VERIFY_ELEMENT(xrates, 2456 IEEE80211_RATE_MAXSIZE - rates[1]); 2457 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); 2458 IEEE80211_VERIFY_SSID(ic->ic_bss, ssid); 2459 if ((ic->ic_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 2460 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 2461 wh, ieee80211_mgt_subtype_name[subtype >> 2462 IEEE80211_FC0_SUBTYPE_SHIFT], 2463 "%s", "no ssid with ssid suppression enabled"); 2464 ic->ic_stats.is_rx_ssidmismatch++; /*XXX*/ 2465 return; 2466 } 2467 2468 allocbs = 0; 2469 if (ni == ic->ic_bss) { 2470 if (ic->ic_opmode != IEEE80211_M_IBSS) { 2471 ni = ieee80211_tmp_node(ic, wh->i_addr2); 2472 allocbs = 1; 2473 } else if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 2474 /* 2475 * XXX Cannot tell if the sender is operating 2476 * in ibss mode. But we need a new node to 2477 * send the response so blindly add them to the 2478 * neighbor table. 2479 */ 2480 ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta, 2481 wh->i_addr2); 2482 } 2483 if (ni == NULL) 2484 return; 2485 } 2486 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2487 "[%s] recv probe req\n", ether_sprintf(wh->i_addr2)); 2488 ni->ni_rssi = rssi; 2489 ni->ni_rstamp = rstamp; 2490 rate = ieee80211_setup_rates(ni, rates, xrates, 2491 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE 2492 | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2493 if (rate & IEEE80211_RATE_BASIC) { 2494 IEEE80211_DISCARD(ic, IEEE80211_MSG_XRATE, 2495 wh, ieee80211_mgt_subtype_name[subtype >> 2496 IEEE80211_FC0_SUBTYPE_SHIFT], 2497 "%s", "recv'd rate set invalid"); 2498 } else { 2499 IEEE80211_SEND_MGMT(ic, ni, 2500 IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0); 2501 } 2502 if (allocbs) { 2503 /* 2504 * Temporary node created just to send a 2505 * response, reclaim immediately. 2506 */ 2507 ieee80211_free_node(ni); 2508 } else if (ath != NULL) 2509 ieee80211_saveath(ni, ath); 2510 break; 2511 2512 case IEEE80211_FC0_SUBTYPE_AUTH: { 2513 uint16_t algo, seq, status; 2514 /* 2515 * auth frame format 2516 * [2] algorithm 2517 * [2] sequence 2518 * [2] status 2519 * [tlv*] challenge 2520 */ 2521 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 2522 algo = le16toh(*(uint16_t *)frm); 2523 seq = le16toh(*(uint16_t *)(frm + 2)); 2524 status = le16toh(*(uint16_t *)(frm + 4)); 2525 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 2526 "[%s] recv auth frame with algorithm %d seq %d\n", 2527 ether_sprintf(wh->i_addr2), algo, seq); 2528 /* 2529 * Consult the ACL policy module if setup. 2530 */ 2531 if (ic->ic_acl != NULL && 2532 !ic->ic_acl->iac_check(ic, wh->i_addr2)) { 2533 IEEE80211_DISCARD(ic, IEEE80211_MSG_ACL, 2534 wh, "auth", "%s", "disallowed by ACL"); 2535 ic->ic_stats.is_rx_acl++; 2536 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 2537 IEEE80211_SEND_MGMT(ic, ni, 2538 IEEE80211_FC0_SUBTYPE_AUTH, 2539 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 2540 } 2541 return; 2542 } 2543 if (ic->ic_flags & IEEE80211_F_COUNTERM) { 2544 IEEE80211_DISCARD(ic, 2545 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 2546 wh, "auth", "%s", "TKIP countermeasures enabled"); 2547 ic->ic_stats.is_rx_auth_countermeasures++; 2548 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 2549 IEEE80211_SEND_MGMT(ic, ni, 2550 IEEE80211_FC0_SUBTYPE_AUTH, 2551 IEEE80211_REASON_MIC_FAILURE); 2552 } 2553 return; 2554 } 2555 if (algo == IEEE80211_AUTH_ALG_SHARED) 2556 ieee80211_auth_shared(ic, wh, frm + 6, efrm, ni, rssi, 2557 noise, rstamp, seq, status); 2558 else if (algo == IEEE80211_AUTH_ALG_OPEN) 2559 ieee80211_auth_open(ic, wh, ni, rssi, noise, rstamp, 2560 seq, status); 2561 else { 2562 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 2563 wh, "auth", "unsupported alg %d", algo); 2564 ic->ic_stats.is_rx_auth_unsupported++; 2565 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 2566 /* XXX not right */ 2567 IEEE80211_SEND_MGMT(ic, ni, 2568 IEEE80211_FC0_SUBTYPE_AUTH, 2569 (seq+1) | (IEEE80211_STATUS_ALG<<16)); 2570 } 2571 return; 2572 } 2573 break; 2574 } 2575 2576 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2577 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 2578 uint16_t capinfo, lintval; 2579 struct ieee80211_rsnparms rsnparms; 2580 uint8_t reason; 2581 int badwparsn; 2582 2583 if (ic->ic_opmode != IEEE80211_M_HOSTAP || 2584 ic->ic_state != IEEE80211_S_RUN) { 2585 ic->ic_stats.is_rx_mgtdiscard++; 2586 return; 2587 } 2588 2589 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2590 reassoc = 1; 2591 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 2592 } else { 2593 reassoc = 0; 2594 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 2595 } 2596 /* 2597 * asreq frame format 2598 * [2] capability information 2599 * [2] listen interval 2600 * [6*] current AP address (reassoc only) 2601 * [tlv] ssid 2602 * [tlv] supported rates 2603 * [tlv] extended supported rates 2604 * [tlv] WPA or RSN 2605 * [tlv] HT capabilities 2606 * [tlv] Atheros capabilities 2607 */ 2608 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 2609 if (!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid)) { 2610 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 2611 wh, ieee80211_mgt_subtype_name[subtype >> 2612 IEEE80211_FC0_SUBTYPE_SHIFT], 2613 "%s", "wrong bssid"); 2614 ic->ic_stats.is_rx_assoc_bss++; 2615 return; 2616 } 2617 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 2618 lintval = le16toh(*(uint16_t *)frm); frm += 2; 2619 if (reassoc) 2620 frm += 6; /* ignore current AP info */ 2621 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 2622 while (efrm - frm > 1) { 2623 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 2624 switch (*frm) { 2625 case IEEE80211_ELEMID_SSID: 2626 ssid = frm; 2627 break; 2628 case IEEE80211_ELEMID_RATES: 2629 rates = frm; 2630 break; 2631 case IEEE80211_ELEMID_XRATES: 2632 xrates = frm; 2633 break; 2634 /* XXX verify only one of RSN and WPA ie's? */ 2635 case IEEE80211_ELEMID_RSN: 2636 rsn = frm; 2637 break; 2638 case IEEE80211_ELEMID_HTCAP: 2639 htcap = frm; 2640 break; 2641 case IEEE80211_ELEMID_VENDOR: 2642 if (iswpaoui(frm)) 2643 wpa = frm; 2644 else if (iswmeinfo(frm)) 2645 wme = frm; 2646 else if (isatherosoui(frm)) 2647 ath = frm; 2648 else if (ic->ic_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 2649 if (ishtcapoui(frm) && htcap == NULL) 2650 htcap = frm; 2651 } 2652 break; 2653 } 2654 frm += frm[1] + 2; 2655 } 2656 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 2657 if (xrates != NULL) 2658 IEEE80211_VERIFY_ELEMENT(xrates, 2659 IEEE80211_RATE_MAXSIZE - rates[1]); 2660 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); 2661 IEEE80211_VERIFY_SSID(ic->ic_bss, ssid); 2662 if (htcap != NULL) { 2663 IEEE80211_VERIFY_LENGTH(htcap[1], 2664 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2665 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2666 sizeof(struct ieee80211_ie_htcap)-2, 2667 return); /* XXX just NULL out? */ 2668 } 2669 2670 if (ni == ic->ic_bss) { 2671 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 2672 "[%s] deny %s request, sta not authenticated\n", 2673 ether_sprintf(wh->i_addr2), 2674 reassoc ? "reassoc" : "assoc"); 2675 ieee80211_send_error(ic, ni, wh->i_addr2, 2676 IEEE80211_FC0_SUBTYPE_DEAUTH, 2677 IEEE80211_REASON_ASSOC_NOT_AUTHED); 2678 ic->ic_stats.is_rx_assoc_notauth++; 2679 return; 2680 } 2681 /* assert right association security credentials */ 2682 badwparsn = 0; 2683 switch (ic->ic_flags & IEEE80211_F_WPA) { 2684 case IEEE80211_F_WPA1: 2685 if (wpa == NULL) 2686 badwparsn = 1; 2687 break; 2688 case IEEE80211_F_WPA2: 2689 if (rsn == NULL) 2690 badwparsn = 1; 2691 break; 2692 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 2693 if (wpa == NULL && rsn == NULL) 2694 badwparsn = 1; 2695 break; 2696 } 2697 if (badwparsn) { 2698 IEEE80211_DPRINTF(ic, 2699 IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 2700 "[%s] no WPA/RSN IE in association request\n", 2701 ether_sprintf(wh->i_addr2)); 2702 IEEE80211_SEND_MGMT(ic, ni, 2703 IEEE80211_FC0_SUBTYPE_DEAUTH, 2704 IEEE80211_REASON_IE_INVALID); 2705 ieee80211_node_leave(ic, ni); 2706 ic->ic_stats.is_rx_assoc_badwpaie++; 2707 return; 2708 } 2709 if (wpa != NULL || rsn != NULL) { 2710 /* 2711 * Parse WPA/RSN information element. Note that 2712 * we initialize the param block from the node 2713 * state so that information in the IE overrides 2714 * our defaults. The resulting parameters are 2715 * installed below after the association is assured. 2716 */ 2717 rsnparms = ni->ni_rsn; 2718 if (wpa != NULL) 2719 reason = ieee80211_parse_wpa(ic, wpa, &rsnparms, wh); 2720 else 2721 reason = ieee80211_parse_rsn(ic, rsn, &rsnparms, wh); 2722 if (reason != 0) { 2723 IEEE80211_SEND_MGMT(ic, ni, 2724 IEEE80211_FC0_SUBTYPE_DEAUTH, reason); 2725 ieee80211_node_leave(ic, ni); 2726 /* XXX distinguish WPA/RSN? */ 2727 ic->ic_stats.is_rx_assoc_badwpaie++; 2728 return; 2729 } 2730 IEEE80211_DPRINTF(ic, 2731 IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 2732 "[%s] %s ie: mc %u/%u uc %u/%u key %u caps 0x%x\n", 2733 ether_sprintf(wh->i_addr2), 2734 wpa != NULL ? "WPA" : "RSN", 2735 rsnparms.rsn_mcastcipher, rsnparms.rsn_mcastkeylen, 2736 rsnparms.rsn_ucastcipher, rsnparms.rsn_ucastkeylen, 2737 rsnparms.rsn_keymgmt, rsnparms.rsn_caps); 2738 } 2739 /* discard challenge after association */ 2740 if (ni->ni_challenge != NULL) { 2741 FREE(ni->ni_challenge, M_80211_NODE); 2742 ni->ni_challenge = NULL; 2743 } 2744 /* NB: 802.11 spec says to ignore station's privacy bit */ 2745 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2746 capinfomismatch(ni, wh, reassoc, resp, 2747 "capability", capinfo); 2748 return; 2749 } 2750 /* 2751 * Disallow re-associate w/ invalid slot time setting. 2752 */ 2753 if (ni->ni_associd != 0 && 2754 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2755 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2756 capinfomismatch(ni, wh, reassoc, resp, 2757 "slot time", capinfo); 2758 return; 2759 } 2760 rate = ieee80211_setup_rates(ni, rates, xrates, 2761 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2762 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2763 if (rate & IEEE80211_RATE_BASIC) { 2764 ratesetmismatch(ni, wh, reassoc, resp, "basic", rate); 2765 return; 2766 } 2767 /* 2768 * If constrained to 11g-only stations reject an 2769 * 11b-only station. We cheat a bit here by looking 2770 * at the max negotiated xmit rate and assuming anyone 2771 * with a best rate <24Mb/s is an 11b station. 2772 */ 2773 if ((ic->ic_flags & IEEE80211_F_PUREG) && rate < 48) { 2774 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2775 return; 2776 } 2777 /* XXX enforce PUREN */ 2778 /* 802.11n-specific rateset handling */ 2779 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan) && htcap != NULL) { 2780 rate = ieee80211_setup_htrates(ni, htcap, 2781 IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | 2782 IEEE80211_F_DOBRS); 2783 if (rate & IEEE80211_RATE_BASIC) { 2784 /* XXX 11n-specific stat */ 2785 ratesetmismatch(ni, wh, reassoc, resp, 2786 "HT", rate); 2787 return; 2788 } 2789 ieee80211_ht_node_init(ni, htcap); 2790 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2791 ieee80211_ht_node_cleanup(ni); 2792 ni->ni_rssi = rssi; 2793 ni->ni_noise = noise; 2794 ni->ni_rstamp = rstamp; 2795 ni->ni_intval = lintval; 2796 ni->ni_capinfo = capinfo; 2797 ni->ni_chan = ic->ic_bsschan; 2798 ni->ni_fhdwell = ic->ic_bss->ni_fhdwell; 2799 ni->ni_fhindex = ic->ic_bss->ni_fhindex; 2800 if (wpa != NULL) { 2801 /* 2802 * Record WPA parameters for station, mark 2803 * node as using WPA and record information element 2804 * for applications that require it. 2805 */ 2806 ni->ni_rsn = rsnparms; 2807 ieee80211_saveie(&ni->ni_wpa_ie, wpa); 2808 } else if (ni->ni_wpa_ie != NULL) { 2809 /* 2810 * Flush any state from a previous association. 2811 */ 2812 FREE(ni->ni_wpa_ie, M_80211_NODE); 2813 ni->ni_wpa_ie = NULL; 2814 } 2815 if (rsn != NULL) { 2816 /* 2817 * Record RSN parameters for station, mark 2818 * node as using WPA and record information element 2819 * for applications that require it. 2820 */ 2821 ni->ni_rsn = rsnparms; 2822 ieee80211_saveie(&ni->ni_rsn_ie, rsn); 2823 } else if (ni->ni_rsn_ie != NULL) { 2824 /* 2825 * Flush any state from a previous association. 2826 */ 2827 FREE(ni->ni_rsn_ie, M_80211_NODE); 2828 ni->ni_rsn_ie = NULL; 2829 } 2830 if (wme != NULL) { 2831 /* 2832 * Record WME parameters for station, mark node 2833 * as capable of QoS and record information 2834 * element for applications that require it. 2835 */ 2836 ieee80211_saveie(&ni->ni_wme_ie, wme); 2837 ni->ni_flags |= IEEE80211_NODE_QOS; 2838 } else if (ni->ni_wme_ie != NULL) { 2839 /* 2840 * Flush any state from a previous association. 2841 */ 2842 FREE(ni->ni_wme_ie, M_80211_NODE); 2843 ni->ni_wme_ie = NULL; 2844 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2845 } 2846 if (ath != NULL) { 2847 /* 2848 * Record ATH parameters for station, mark 2849 * node with appropriate capabilities, and 2850 * record the information element for 2851 * applications that require it. 2852 */ 2853 ieee80211_saveath(ni, ath); 2854 } else if (ni->ni_ath_ie != NULL) { 2855 /* 2856 * Flush any state from a previous association. 2857 */ 2858 FREE(ni->ni_ath_ie, M_80211_NODE); 2859 ni->ni_ath_ie = NULL; 2860 ni->ni_ath_flags = 0; 2861 } 2862 ieee80211_node_join(ic, ni, resp); 2863 ieee80211_deliver_l2uf(ni); 2864 break; 2865 } 2866 2867 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2868 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 2869 uint16_t capinfo, associd; 2870 uint16_t status; 2871 2872 if (ic->ic_opmode != IEEE80211_M_STA || 2873 ic->ic_state != IEEE80211_S_ASSOC) { 2874 ic->ic_stats.is_rx_mgtdiscard++; 2875 return; 2876 } 2877 2878 /* 2879 * asresp frame format 2880 * [2] capability information 2881 * [2] status 2882 * [2] association ID 2883 * [tlv] supported rates 2884 * [tlv] extended supported rates 2885 * [tlv] WME 2886 * [tlv] HT capabilities 2887 */ 2888 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 2889 ni = ic->ic_bss; 2890 capinfo = le16toh(*(uint16_t *)frm); 2891 frm += 2; 2892 status = le16toh(*(uint16_t *)frm); 2893 frm += 2; 2894 if (status != 0) { 2895 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2896 "[%s] %sassoc failed (reason %d)\n", 2897 ether_sprintf(wh->i_addr2), 2898 ISREASSOC(subtype) ? "re" : "", status); 2899 if (ni != ic->ic_bss) /* XXX never true? */ 2900 ni->ni_fails++; 2901 ic->ic_stats.is_rx_auth_fail++; /* XXX */ 2902 return; 2903 } 2904 associd = le16toh(*(uint16_t *)frm); 2905 frm += 2; 2906 2907 rates = xrates = wme = htcap = NULL; 2908 while (efrm - frm > 1) { 2909 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 2910 switch (*frm) { 2911 case IEEE80211_ELEMID_RATES: 2912 rates = frm; 2913 break; 2914 case IEEE80211_ELEMID_XRATES: 2915 xrates = frm; 2916 break; 2917 case IEEE80211_ELEMID_HTCAP: 2918 htcap = frm; 2919 break; 2920 case IEEE80211_ELEMID_VENDOR: 2921 if (iswmeoui(frm)) 2922 wme = frm; 2923 /* XXX Atheros OUI support */ 2924 break; 2925 } 2926 frm += frm[1] + 2; 2927 } 2928 2929 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 2930 if (xrates != NULL) 2931 IEEE80211_VERIFY_ELEMENT(xrates, 2932 IEEE80211_RATE_MAXSIZE - rates[1]); 2933 rate = ieee80211_setup_rates(ni, rates, xrates, 2934 IEEE80211_F_JOIN | 2935 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2936 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2937 if (rate & IEEE80211_RATE_BASIC) { 2938 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2939 "[%s] %sassoc failed (rate set mismatch)\n", 2940 ether_sprintf(wh->i_addr2), 2941 ISREASSOC(subtype) ? "re" : ""); 2942 if (ni != ic->ic_bss) /* XXX never true? */ 2943 ni->ni_fails++; 2944 ic->ic_stats.is_rx_assoc_norate++; 2945 ieee80211_new_state(ic, IEEE80211_S_SCAN, 2946 IEEE80211_SCAN_FAIL_STATUS); 2947 return; 2948 } 2949 2950 ni->ni_capinfo = capinfo; 2951 ni->ni_associd = associd; 2952 if (wme != NULL && 2953 ieee80211_parse_wmeparams(ic, wme, wh) >= 0) { 2954 ni->ni_flags |= IEEE80211_NODE_QOS; 2955 ieee80211_wme_updateparams(ic); 2956 } else 2957 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2958 /* 2959 * Configure state now that we are associated. 2960 * 2961 * XXX may need different/additional driver callbacks? 2962 */ 2963 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 2964 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 2965 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 2966 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 2967 } else { 2968 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 2969 ic->ic_flags |= IEEE80211_F_USEBARKER; 2970 } 2971 ieee80211_set_shortslottime(ic, 2972 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 2973 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 2974 /* 2975 * Honor ERP protection. 2976 * 2977 * NB: ni_erp should zero for non-11g operation. 2978 */ 2979 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2980 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 2981 ic->ic_flags |= IEEE80211_F_USEPROT; 2982 else 2983 ic->ic_flags &= ~IEEE80211_F_USEPROT; 2984 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2985 "[%s] %sassoc success: %s preamble, %s slot time%s%s%s%s\n", 2986 ether_sprintf(wh->i_addr2), 2987 ISREASSOC(subtype) ? "re" : "", 2988 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 2989 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 2990 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 2991 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 2992 IEEE80211_ATH_CAP(ic, ni, IEEE80211_NODE_FF) ? 2993 ", fast-frames" : "", 2994 IEEE80211_ATH_CAP(ic, ni, IEEE80211_NODE_TURBOP) ? 2995 ", turbo" : "" 2996 ); 2997 ieee80211_new_state(ic, IEEE80211_S_RUN, subtype); 2998 break; 2999 } 3000 3001 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 3002 uint16_t reason; 3003 3004 if (ic->ic_state == IEEE80211_S_SCAN) { 3005 ic->ic_stats.is_rx_mgtdiscard++; 3006 return; 3007 } 3008 /* 3009 * deauth frame format 3010 * [2] reason 3011 */ 3012 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 3013 reason = le16toh(*(uint16_t *)frm); 3014 ic->ic_stats.is_rx_deauth++; 3015 IEEE80211_NODE_STAT(ni, rx_deauth); 3016 3017 if (!IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_myaddr)) { 3018 /* NB: can happen when in promiscuous mode */ 3019 ic->ic_stats.is_rx_mgtdiscard++; 3020 break; 3021 } 3022 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 3023 "[%s] recv deauthenticate (reason %d)\n", 3024 ether_sprintf(ni->ni_macaddr), reason); 3025 switch (ic->ic_opmode) { 3026 case IEEE80211_M_STA: 3027 ieee80211_new_state(ic, IEEE80211_S_AUTH, 3028 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 3029 break; 3030 case IEEE80211_M_HOSTAP: 3031 if (ni != ic->ic_bss) 3032 ieee80211_node_leave(ic, ni); 3033 break; 3034 default: 3035 ic->ic_stats.is_rx_mgtdiscard++; 3036 break; 3037 } 3038 break; 3039 } 3040 3041 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 3042 uint16_t reason; 3043 3044 if (ic->ic_state != IEEE80211_S_RUN && 3045 ic->ic_state != IEEE80211_S_ASSOC && 3046 ic->ic_state != IEEE80211_S_AUTH) { 3047 ic->ic_stats.is_rx_mgtdiscard++; 3048 return; 3049 } 3050 /* 3051 * disassoc frame format 3052 * [2] reason 3053 */ 3054 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 3055 reason = le16toh(*(uint16_t *)frm); 3056 ic->ic_stats.is_rx_disassoc++; 3057 IEEE80211_NODE_STAT(ni, rx_disassoc); 3058 3059 if (!IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_myaddr)) { 3060 /* NB: can happen when in promiscuous mode */ 3061 ic->ic_stats.is_rx_mgtdiscard++; 3062 break; 3063 } 3064 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 3065 "[%s] recv disassociate (reason %d)\n", 3066 ether_sprintf(ni->ni_macaddr), reason); 3067 switch (ic->ic_opmode) { 3068 case IEEE80211_M_STA: 3069 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 0); 3070 break; 3071 case IEEE80211_M_HOSTAP: 3072 if (ni != ic->ic_bss) 3073 ieee80211_node_leave(ic, ni); 3074 break; 3075 default: 3076 ic->ic_stats.is_rx_mgtdiscard++; 3077 break; 3078 } 3079 break; 3080 } 3081 3082 case IEEE80211_FC0_SUBTYPE_ACTION: { 3083 const struct ieee80211_action *ia; 3084 3085 if (ic->ic_state != IEEE80211_S_RUN && 3086 ic->ic_state != IEEE80211_S_ASSOC && 3087 ic->ic_state != IEEE80211_S_AUTH) { 3088 ic->ic_stats.is_rx_mgtdiscard++; 3089 return; 3090 } 3091 /* 3092 * action frame format: 3093 * [1] category 3094 * [1] action 3095 * [tlv] parameters 3096 */ 3097 IEEE80211_VERIFY_LENGTH(efrm - frm, 3098 sizeof(struct ieee80211_action), return); 3099 ia = (const struct ieee80211_action *) frm; 3100 3101 ic->ic_stats.is_rx_action++; 3102 IEEE80211_NODE_STAT(ni, rx_action); 3103 3104 /* verify frame payloads but defer processing */ 3105 /* XXX maybe push this to method */ 3106 switch (ia->ia_category) { 3107 case IEEE80211_ACTION_CAT_BA: 3108 switch (ia->ia_action) { 3109 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 3110 IEEE80211_VERIFY_LENGTH(efrm - frm, 3111 sizeof(struct ieee80211_action_ba_addbarequest), 3112 return); 3113 break; 3114 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 3115 IEEE80211_VERIFY_LENGTH(efrm - frm, 3116 sizeof(struct ieee80211_action_ba_addbaresponse), 3117 return); 3118 break; 3119 case IEEE80211_ACTION_BA_DELBA: 3120 IEEE80211_VERIFY_LENGTH(efrm - frm, 3121 sizeof(struct ieee80211_action_ba_delba), 3122 return); 3123 break; 3124 } 3125 break; 3126 case IEEE80211_ACTION_CAT_HT: 3127 switch (ia->ia_action) { 3128 case IEEE80211_ACTION_HT_TXCHWIDTH: 3129 IEEE80211_VERIFY_LENGTH(efrm - frm, 3130 sizeof(struct ieee80211_action_ht_txchwidth), 3131 return); 3132 break; 3133 } 3134 break; 3135 } 3136 ic->ic_recv_action(ni, frm, efrm); 3137 break; 3138 } 3139 3140 default: 3141 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 3142 wh, "mgt", "subtype 0x%x not handled", subtype); 3143 ic->ic_stats.is_rx_badsubtype++; 3144 break; 3145 } 3146#undef ISREASSOC 3147#undef ISPROBE 3148} 3149#undef IEEE80211_VERIFY_LENGTH 3150#undef IEEE80211_VERIFY_ELEMENT 3151 3152/* 3153 * Process a received ps-poll frame. 3154 */ 3155static void 3156ieee80211_recv_pspoll(struct ieee80211com *ic, 3157 struct ieee80211_node *ni, struct mbuf *m0) 3158{ 3159 struct ieee80211_frame_min *wh; 3160 struct mbuf *m; 3161 uint16_t aid; 3162 int qlen; 3163 3164 wh = mtod(m0, struct ieee80211_frame_min *); 3165 if (ni->ni_associd == 0) { 3166 IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 3167 (struct ieee80211_frame *) wh, "ps-poll", 3168 "%s", "unassociated station"); 3169 ic->ic_stats.is_ps_unassoc++; 3170 IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 3171 IEEE80211_REASON_NOT_ASSOCED); 3172 return; 3173 } 3174 3175 aid = le16toh(*(uint16_t *)wh->i_dur); 3176 if (aid != ni->ni_associd) { 3177 IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 3178 (struct ieee80211_frame *) wh, "ps-poll", 3179 "aid mismatch: sta aid 0x%x poll aid 0x%x", 3180 ni->ni_associd, aid); 3181 ic->ic_stats.is_ps_badaid++; 3182 IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 3183 IEEE80211_REASON_NOT_ASSOCED); 3184 return; 3185 } 3186 3187 /* Okay, take the first queued packet and put it out... */ 3188 IEEE80211_NODE_SAVEQ_DEQUEUE(ni, m, qlen); 3189 if (m == NULL) { 3190 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 3191 "[%s] recv ps-poll, but queue empty\n", 3192 ether_sprintf(wh->i_addr2)); 3193 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 3194 ic->ic_stats.is_ps_qempty++; /* XXX node stat */ 3195 if (ic->ic_set_tim != NULL) 3196 ic->ic_set_tim(ni, 0); /* just in case */ 3197 return; 3198 } 3199 /* 3200 * If there are more packets, set the more packets bit 3201 * in the packet dispatched to the station; otherwise 3202 * turn off the TIM bit. 3203 */ 3204 if (qlen != 0) { 3205 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 3206 "[%s] recv ps-poll, send packet, %u still queued\n", 3207 ether_sprintf(ni->ni_macaddr), qlen); 3208 m->m_flags |= M_MORE_DATA; 3209 } else { 3210 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 3211 "[%s] recv ps-poll, send packet, queue empty\n", 3212 ether_sprintf(ni->ni_macaddr)); 3213 if (ic->ic_set_tim != NULL) 3214 ic->ic_set_tim(ni, 0); 3215 } 3216 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 3217 IF_ENQUEUE(&ic->ic_ifp->if_snd, m); 3218} 3219 3220#ifdef IEEE80211_DEBUG 3221/* 3222 * Debugging support. 3223 */ 3224 3225/* 3226 * Return the bssid of a frame. 3227 */ 3228static const uint8_t * 3229ieee80211_getbssid(struct ieee80211com *ic, const struct ieee80211_frame *wh) 3230{ 3231 if (ic->ic_opmode == IEEE80211_M_STA) 3232 return wh->i_addr2; 3233 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 3234 return wh->i_addr1; 3235 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 3236 return wh->i_addr1; 3237 return wh->i_addr3; 3238} 3239 3240void 3241ieee80211_note(struct ieee80211com *ic, const char *fmt, ...) 3242{ 3243 char buf[128]; /* XXX */ 3244 va_list ap; 3245 3246 va_start(ap, fmt); 3247 vsnprintf(buf, sizeof(buf), fmt, ap); 3248 va_end(ap); 3249 3250 if_printf(ic->ic_ifp, "%s", buf); /* NB: no \n */ 3251} 3252 3253void 3254ieee80211_note_frame(struct ieee80211com *ic, 3255 const struct ieee80211_frame *wh, 3256 const char *fmt, ...) 3257{ 3258 char buf[128]; /* XXX */ 3259 va_list ap; 3260 3261 va_start(ap, fmt); 3262 vsnprintf(buf, sizeof(buf), fmt, ap); 3263 va_end(ap); 3264 if_printf(ic->ic_ifp, "[%s] %s\n", 3265 ether_sprintf(ieee80211_getbssid(ic, wh)), buf); 3266} 3267 3268void 3269ieee80211_note_mac(struct ieee80211com *ic, 3270 const uint8_t mac[IEEE80211_ADDR_LEN], 3271 const char *fmt, ...) 3272{ 3273 char buf[128]; /* XXX */ 3274 va_list ap; 3275 3276 va_start(ap, fmt); 3277 vsnprintf(buf, sizeof(buf), fmt, ap); 3278 va_end(ap); 3279 if_printf(ic->ic_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 3280} 3281 3282void 3283ieee80211_discard_frame(struct ieee80211com *ic, 3284 const struct ieee80211_frame *wh, 3285 const char *type, const char *fmt, ...) 3286{ 3287 va_list ap; 3288 3289 printf("[%s:%s] discard ", ic->ic_ifp->if_xname, 3290 ether_sprintf(ieee80211_getbssid(ic, wh))); 3291 if (type != NULL) 3292 printf("%s frame, ", type); 3293 else 3294 printf("frame, "); 3295 va_start(ap, fmt); 3296 vprintf(fmt, ap); 3297 va_end(ap); 3298 printf("\n"); 3299} 3300 3301void 3302ieee80211_discard_ie(struct ieee80211com *ic, 3303 const struct ieee80211_frame *wh, 3304 const char *type, const char *fmt, ...) 3305{ 3306 va_list ap; 3307 3308 printf("[%s:%s] discard ", ic->ic_ifp->if_xname, 3309 ether_sprintf(ieee80211_getbssid(ic, wh))); 3310 if (type != NULL) 3311 printf("%s information element, ", type); 3312 else 3313 printf("information element, "); 3314 va_start(ap, fmt); 3315 vprintf(fmt, ap); 3316 va_end(ap); 3317 printf("\n"); 3318} 3319 3320void 3321ieee80211_discard_mac(struct ieee80211com *ic, 3322 const uint8_t mac[IEEE80211_ADDR_LEN], 3323 const char *type, const char *fmt, ...) 3324{ 3325 va_list ap; 3326 3327 printf("[%s:%s] discard ", ic->ic_ifp->if_xname, ether_sprintf(mac)); 3328 if (type != NULL) 3329 printf("%s frame, ", type); 3330 else 3331 printf("frame, "); 3332 va_start(ap, fmt); 3333 vprintf(fmt, ap); 3334 va_end(ap); 3335 printf("\n"); 3336} 3337#endif /* IEEE80211_DEBUG */ 3338