1 /* $NetBSD: ieee80211_input.c,v 1.89 2017/09/26 07:42:06 knakahara Exp $ */ 2 /*- 3 * Copyright (c) 2001 Atsushi Onoe 4 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * Alternatively, this software may be distributed under the terms of the 19 * GNU General Public License ("GPL") version 2 as published by the Free 20 * Software Foundation. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #ifdef __FreeBSD__ 36 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_input.c,v 1.81 2005/08/10 16:22:29 sam Exp $"); 37 #endif 38 #ifdef __NetBSD__ 39 __KERNEL_RCSID(0, "$NetBSD: ieee80211_input.c,v 1.89 2017/09/26 07:42:06 knakahara Exp $"); 40 #endif 41 42 #ifdef _KERNEL_OPT 43 #include "opt_inet.h" 44 #endif 45 46 #ifdef __NetBSD__ 47 #endif /* __NetBSD__ */ 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/mbuf.h> 52 #include <sys/malloc.h> 53 #include <sys/endian.h> 54 #include <sys/kernel.h> 55 56 #include <sys/socket.h> 57 #include <sys/sockio.h> 58 #include <sys/endian.h> 59 #include <sys/errno.h> 60 #include <sys/proc.h> 61 #include <sys/sysctl.h> 62 #include <sys/cpu.h> 63 64 #include <net/if.h> 65 #include <net/if_media.h> 66 #include <net/if_arp.h> 67 #include <net/if_ether.h> 68 #include <net/if_llc.h> 69 70 #include <net80211/ieee80211_var.h> 71 72 #include <net/bpf.h> 73 74 #ifdef INET 75 #include <netinet/in.h> 76 #include <net/if_ether.h> 77 #endif 78 79 const struct timeval ieee80211_merge_print_intvl = {.tv_sec = 1, .tv_usec = 0}; 80 81 #ifdef IEEE80211_DEBUG 82 83 /* 84 * Decide if a received management frame should be 85 * printed when debugging is enabled. This filters some 86 * of the less interesting frames that come frequently 87 * (e.g. beacons). 88 */ 89 static __inline int 90 doprint(struct ieee80211com *ic, int subtype) 91 { 92 switch (subtype) { 93 case IEEE80211_FC0_SUBTYPE_BEACON: 94 return (ic->ic_flags & IEEE80211_F_SCAN); 95 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 96 return (ic->ic_opmode == IEEE80211_M_IBSS); 97 } 98 return 1; 99 } 100 101 /* 102 * Emit a debug message about discarding a frame or information 103 * element. One format is for extracting the mac address from 104 * the frame header; the other is for when a header is not 105 * available or otherwise appropriate. 106 */ 107 #define IEEE80211_DISCARD(_ic, _m, _wh, _type, _fmt, ...) do { \ 108 if ((_ic)->ic_debug & (_m)) \ 109 ieee80211_discard_frame(_ic, _wh, _type, _fmt, __VA_ARGS__);\ 110 } while (0) 111 #define IEEE80211_DISCARD_IE(_ic, _m, _wh, _type, _fmt, ...) do { \ 112 if ((_ic)->ic_debug & (_m)) \ 113 ieee80211_discard_ie(_ic, _wh, _type, _fmt, __VA_ARGS__);\ 114 } while (0) 115 #define IEEE80211_DISCARD_MAC(_ic, _m, _mac, _type, _fmt, ...) do { \ 116 if ((_ic)->ic_debug & (_m)) \ 117 ieee80211_discard_mac(_ic, _mac, _type, _fmt, __VA_ARGS__);\ 118 } while (0) 119 #define IEEE80211_DEBUGVAR(a) a 120 121 static const u_int8_t *ieee80211_getbssid(struct ieee80211com *, 122 const struct ieee80211_frame *); 123 static void ieee80211_discard_frame(struct ieee80211com *, 124 const struct ieee80211_frame *, const char *type, const char *fmt, ...); 125 static void ieee80211_discard_ie(struct ieee80211com *, 126 const struct ieee80211_frame *, const char *type, const char *fmt, ...); 127 static void ieee80211_discard_mac(struct ieee80211com *, 128 const u_int8_t mac[IEEE80211_ADDR_LEN], const char *type, 129 const char *fmt, ...); 130 #else 131 #define IEEE80211_DISCARD(_ic, _m, _wh, _type, _fmt, ...) 132 #define IEEE80211_DISCARD_IE(_ic, _m, _wh, _type, _fmt, ...) 133 #define IEEE80211_DISCARD_MAC(_ic, _m, _mac, _type, _fmt, ...) 134 #define IEEE80211_DEBUGVAR(a) 135 #endif /* IEEE80211_DEBUG */ 136 137 static struct mbuf *ieee80211_defrag(struct ieee80211com *, 138 struct ieee80211_node *, struct mbuf *, int); 139 static struct mbuf *ieee80211_decap(struct ieee80211com *, struct mbuf *, int); 140 static void ieee80211_send_error(struct ieee80211com *, struct ieee80211_node *, 141 const u_int8_t *mac, int subtype, int arg); 142 static void ieee80211_deliver_data(struct ieee80211com *, 143 struct ieee80211_node *, struct mbuf *); 144 #ifndef IEEE80211_NO_HOSTAP 145 static void ieee80211_node_pwrsave(struct ieee80211_node *, int enable); 146 static void ieee80211_recv_pspoll(struct ieee80211com *, 147 struct ieee80211_node *, struct mbuf *); 148 #endif /* !IEEE80211_NO_HOSTAP */ 149 static void ieee80211_update_adhoc_node(struct ieee80211com *, 150 struct ieee80211_node *, struct ieee80211_frame *, 151 struct ieee80211_scanparams *, int, u_int32_t); 152 153 /* 154 * Process a received frame. The node associated with the sender 155 * should be supplied. If nothing was found in the node table then 156 * the caller is assumed to supply a reference to ic_bss instead. 157 * The RSSI and a timestamp are also supplied. The RSSI data is used 158 * during AP scanning to select a AP to associate with; it can have 159 * any units so long as values have consistent units and higher values 160 * mean ``better signal''. The receive timestamp is currently not used 161 * by the 802.11 layer. 162 */ 163 int 164 ieee80211_input(struct ieee80211com *ic, struct mbuf *m, 165 struct ieee80211_node *ni, int rssi, u_int32_t rstamp) 166 { 167 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 168 #define HAS_SEQ(type) ((type & 0x4) == 0) 169 struct ifnet *ifp = ic->ic_ifp; 170 struct ieee80211_frame *wh; 171 struct ieee80211_key *key; 172 struct ether_header *eh; 173 int hdrspace; 174 u_int8_t dir, type, subtype; 175 u_int8_t *bssid; 176 u_int16_t rxseq; 177 IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); 178 179 KASSERT(!cpu_intr_p()); 180 181 IASSERT(ni != NULL, ("null node")); 182 ni->ni_inact = ni->ni_inact_reload; 183 184 /* trim CRC here so WEP can find its own CRC at the end of packet. */ 185 if (m->m_flags & M_HASFCS) { 186 m_adj(m, -IEEE80211_CRC_LEN); 187 m->m_flags &= ~M_HASFCS; 188 } 189 type = -1; /* undefined */ 190 /* 191 * In monitor mode, send everything directly to bpf. 192 * XXX may want to include the CRC 193 */ 194 if (ic->ic_opmode == IEEE80211_M_MONITOR) 195 goto out; 196 197 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 198 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 199 ni->ni_macaddr, NULL, 200 "too short (1): len %u", m->m_pkthdr.len); 201 ic->ic_stats.is_rx_tooshort++; 202 goto out; 203 } 204 /* 205 * Bit of a cheat here, we use a pointer for a 3-address 206 * frame format but don't reference fields past outside 207 * ieee80211_frame_min w/o first validating the data is 208 * present. 209 */ 210 wh = mtod(m, struct ieee80211_frame *); 211 212 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 213 IEEE80211_FC0_VERSION_0) { 214 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 215 ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]); 216 ic->ic_stats.is_rx_badversion++; 217 goto err; 218 } 219 220 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 221 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 222 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 223 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 224 switch (ic->ic_opmode) { 225 case IEEE80211_M_STA: 226 bssid = wh->i_addr2; 227 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 228 /* not interested in */ 229 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 230 bssid, NULL, "node %s, %s", 231 ether_snprintf(ebuf, sizeof(ebuf), 232 ni->ni_bssid), "not to bss"); 233 ic->ic_stats.is_rx_wrongbss++; 234 goto out; 235 } 236 237 /* Filter out packets not directed to us in case the 238 * device is in promiscous mode 239 */ 240 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1)) 241 && (! IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_myaddr))) { 242 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 243 bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D", 244 ic->ic_myaddr, ":", wh->i_addr1, ":"); 245 ic->ic_stats.is_rx_wrongbss++; 246 goto out; 247 } 248 break; 249 case IEEE80211_M_IBSS: 250 case IEEE80211_M_AHDEMO: 251 case IEEE80211_M_HOSTAP: 252 if (dir != IEEE80211_FC1_DIR_NODS) 253 bssid = wh->i_addr1; 254 else if (type == IEEE80211_FC0_TYPE_CTL) 255 bssid = wh->i_addr1; 256 else { 257 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 258 IEEE80211_DISCARD_MAC(ic, 259 IEEE80211_MSG_ANY, ni->ni_macaddr, 260 NULL, "too short (2): len %u", 261 m->m_pkthdr.len); 262 ic->ic_stats.is_rx_tooshort++; 263 goto out; 264 } 265 bssid = wh->i_addr3; 266 } 267 if (type != IEEE80211_FC0_TYPE_DATA) 268 break; 269 /* 270 * Data frame, validate the bssid. 271 */ 272 if (!IEEE80211_ADDR_EQ(bssid, ic->ic_bss->ni_bssid) && 273 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 274 /* not interested in */ 275 IEEE80211_DEBUGVAR( 276 char bbuf[3 * ETHER_ADDR_LEN]); 277 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 278 bssid, NULL, "bss %s, broadcast %s, %s", 279 ether_snprintf(ebuf, sizeof(ebuf), 280 ic->ic_bss->ni_bssid), 281 ether_snprintf(bbuf, sizeof(bbuf), 282 ifp->if_broadcastaddr), "not to bss"); 283 ic->ic_stats.is_rx_wrongbss++; 284 goto out; 285 } 286 /* 287 * For adhoc mode we cons up a node when it doesn't 288 * exist. This should probably done after an ACL check. 289 */ 290 if (ni == ic->ic_bss && 291 ic->ic_opmode != IEEE80211_M_HOSTAP && 292 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 293 /* 294 * Fake up a node for this newly 295 * discovered member of the IBSS. 296 */ 297 ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta, 298 wh->i_addr2); 299 if (ni == NULL) { 300 /* NB: stat kept for alloc failure */ 301 goto err; 302 } 303 } 304 break; 305 default: 306 goto out; 307 } 308 ni->ni_rssi = rssi; 309 ni->ni_rstamp = rstamp; 310 if (HAS_SEQ(type) && (ic->ic_opmode != IEEE80211_M_STA || 311 !IEEE80211_IS_MULTICAST(wh->i_addr1))) { 312 u_int8_t tid, retry; 313 u_int16_t rxno, orxno; 314 315 if (ieee80211_has_qos(wh)) { 316 tid = ((struct ieee80211_qosframe *)wh)-> 317 i_qos[0] & IEEE80211_QOS_TID; 318 if (TID_TO_WME_AC(tid) >= WME_AC_VI) 319 ic->ic_wme.wme_hipri_traffic++; 320 tid++; 321 } else 322 tid = 0; 323 rxseq = le16toh(*(u_int16_t *)wh->i_seq); 324 retry = wh->i_fc[1] & IEEE80211_FC1_RETRY; 325 rxno = rxseq >> IEEE80211_SEQ_SEQ_SHIFT; 326 orxno = ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT; 327 if (retry && ( 328 (orxno == 4095 && rxno == orxno) || 329 (orxno != 4095 && 330 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) 331 )) { 332 /* duplicate, discard */ 333 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 334 bssid, "duplicate", 335 "seqno <%u,%u> fragno <%u,%u> tid %u", 336 rxno, 337 orxno, 338 rxseq & IEEE80211_SEQ_FRAG_MASK, 339 ni->ni_rxseqs[tid] & 340 IEEE80211_SEQ_FRAG_MASK, 341 tid); 342 ic->ic_stats.is_rx_dup++; 343 IEEE80211_NODE_STAT(ni, rx_dup); 344 goto out; 345 } 346 ni->ni_rxseqs[tid] = rxseq; 347 } 348 } 349 350 switch (type) { 351 case IEEE80211_FC0_TYPE_DATA: 352 hdrspace = ieee80211_hdrspace(ic, wh); 353 if (m->m_len < hdrspace && 354 (m = m_pullup(m, hdrspace)) == NULL) { 355 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 356 ni->ni_macaddr, NULL, 357 "data too short: expecting %u", hdrspace); 358 ic->ic_stats.is_rx_tooshort++; 359 goto out; /* XXX */ 360 } 361 switch (ic->ic_opmode) { 362 case IEEE80211_M_STA: 363 if (dir != IEEE80211_FC1_DIR_FROMDS) { 364 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 365 wh, "data", "%s", "unknown dir 0x%x", dir); 366 ic->ic_stats.is_rx_wrongdir++; 367 goto out; 368 } 369 if ((ifp->if_flags & IFF_SIMPLEX) && 370 IEEE80211_IS_MULTICAST(wh->i_addr1) && 371 IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_myaddr)) { 372 /* 373 * In IEEE802.11 network, multicast packet 374 * sent from me is broadcasted from AP. 375 * It should be silently discarded for 376 * SIMPLEX interface. 377 */ 378 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 379 wh, NULL, "%s", "multicast echo"); 380 ic->ic_stats.is_rx_mcastecho++; 381 goto out; 382 } 383 break; 384 case IEEE80211_M_IBSS: 385 case IEEE80211_M_AHDEMO: 386 if (dir != IEEE80211_FC1_DIR_NODS) { 387 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 388 wh, "data", "%s", "unknown dir 0x%x", dir); 389 ic->ic_stats.is_rx_wrongdir++; 390 goto out; 391 } 392 /* XXX no power-save support */ 393 break; 394 case IEEE80211_M_HOSTAP: 395 #ifndef IEEE80211_NO_HOSTAP 396 if (dir != IEEE80211_FC1_DIR_TODS) { 397 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 398 wh, "data", "%s", "unknown dir 0x%x", dir); 399 ic->ic_stats.is_rx_wrongdir++; 400 goto out; 401 } 402 /* check if source STA is associated */ 403 if (ni == ic->ic_bss) { 404 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 405 wh, "data", "%s", "unknown src"); 406 ieee80211_send_error(ic, ni, wh->i_addr2, 407 IEEE80211_FC0_SUBTYPE_DEAUTH, 408 IEEE80211_REASON_NOT_AUTHED); 409 ic->ic_stats.is_rx_notassoc++; 410 goto err; 411 } 412 if (ni->ni_associd == 0) { 413 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 414 wh, "data", "%s", "unassoc src"); 415 IEEE80211_SEND_MGMT(ic, ni, 416 IEEE80211_FC0_SUBTYPE_DISASSOC, 417 IEEE80211_REASON_NOT_ASSOCED); 418 ic->ic_stats.is_rx_notassoc++; 419 goto err; 420 } 421 422 /* 423 * Check for power save state change. 424 */ 425 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 426 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 427 ieee80211_node_pwrsave(ni, 428 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 429 #endif /* !IEEE80211_NO_HOSTAP */ 430 break; 431 default: 432 /* XXX here to keep compiler happy */ 433 goto out; 434 } 435 436 /* 437 * Handle privacy requirements. Note that we 438 * must not be preempted from here until after 439 * we (potentially) call ieee80211_crypto_demic; 440 * otherwise we may violate assumptions in the 441 * crypto cipher modules used to do delayed update 442 * of replay sequence numbers. 443 */ 444 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 445 if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { 446 /* 447 * Discard encrypted frames when privacy is off. 448 */ 449 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 450 wh, "WEP", "%s", "PRIVACY off"); 451 ic->ic_stats.is_rx_noprivacy++; 452 IEEE80211_NODE_STAT(ni, rx_noprivacy); 453 goto out; 454 } 455 key = ieee80211_crypto_decap(ic, ni, m, hdrspace); 456 if (key == NULL) { 457 /* NB: stats+msgs handled in crypto_decap */ 458 IEEE80211_NODE_STAT(ni, rx_wepfail); 459 goto out; 460 } 461 wh = mtod(m, struct ieee80211_frame *); 462 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 463 } else { 464 key = NULL; 465 } 466 467 /* 468 * Next up, any fragmentation. 469 */ 470 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 471 m = ieee80211_defrag(ic, ni, m, hdrspace); 472 if (m == NULL) { 473 /* Fragment dropped or frame not complete yet */ 474 goto out; 475 } 476 } 477 wh = NULL; /* no longer valid, catch any uses */ 478 479 /* 480 * Next strip any MSDU crypto bits. 481 */ 482 if (key != NULL && !ieee80211_crypto_demic(ic, key, m, 0)) { 483 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 484 ni->ni_macaddr, "data", "%s", "demic error"); 485 IEEE80211_NODE_STAT(ni, rx_demicfail); 486 goto out; 487 } 488 489 /* copy to listener after decrypt */ 490 bpf_mtap3(ic->ic_rawbpf, m); 491 492 /* 493 * Finally, strip the 802.11 header. 494 */ 495 m = ieee80211_decap(ic, m, hdrspace); 496 if (m == NULL) { 497 /* don't count Null data frames as errors */ 498 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA) 499 goto out; 500 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 501 ni->ni_macaddr, "data", "%s", "decap error"); 502 ic->ic_stats.is_rx_decap++; 503 IEEE80211_NODE_STAT(ni, rx_decap); 504 goto err; 505 } 506 eh = mtod(m, struct ether_header *); 507 if (!ieee80211_node_is_authorized(ni)) { 508 /* 509 * Deny any non-PAE frames received prior to 510 * authorization. For open/shared-key 511 * authentication the port is mark authorized 512 * after authentication completes. For 802.1x 513 * the port is not marked authorized by the 514 * authenticator until the handshake has completed. 515 */ 516 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 517 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 518 eh->ether_shost, "data", 519 "unauthorized port: ether type 0x%x len %u", 520 eh->ether_type, m->m_pkthdr.len); 521 ic->ic_stats.is_rx_unauth++; 522 IEEE80211_NODE_STAT(ni, rx_unauth); 523 goto err; 524 } 525 } else { 526 /* 527 * When denying unencrypted frames, discard 528 * any non-PAE frames received without encryption. 529 */ 530 if ((ic->ic_flags & IEEE80211_F_DROPUNENC) && 531 key == NULL && 532 eh->ether_type != htons(ETHERTYPE_PAE)) { 533 /* 534 * Drop unencrypted frames. 535 */ 536 ic->ic_stats.is_rx_unencrypted++; 537 IEEE80211_NODE_STAT(ni, rx_unencrypted); 538 goto out; 539 } 540 } 541 ifp->if_ipackets++; 542 IEEE80211_NODE_STAT(ni, rx_data); 543 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 544 545 ieee80211_deliver_data(ic, ni, m); 546 return IEEE80211_FC0_TYPE_DATA; 547 548 case IEEE80211_FC0_TYPE_MGT: 549 IEEE80211_NODE_STAT(ni, rx_mgmt); 550 if (dir != IEEE80211_FC1_DIR_NODS) { 551 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 552 wh, "data", "%s", "unknown dir 0x%x", dir); 553 ic->ic_stats.is_rx_wrongdir++; 554 goto err; 555 } 556 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 557 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 558 ni->ni_macaddr, "mgt", "too short: len %u", 559 m->m_pkthdr.len); 560 ic->ic_stats.is_rx_tooshort++; 561 goto out; 562 } 563 #ifdef IEEE80211_DEBUG 564 if ((ieee80211_msg_debug(ic) && doprint(ic, subtype)) || 565 ieee80211_msg_dumppkts(ic)) { 566 if_printf(ic->ic_ifp, "received %s from %s rssi %d\n", 567 ieee80211_mgt_subtype_name[subtype >> 568 IEEE80211_FC0_SUBTYPE_SHIFT], 569 ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), 570 rssi); 571 } 572 #endif 573 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 574 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 575 /* 576 * Only shared key auth frames with a challenge 577 * should be encrypted, discard all others. 578 */ 579 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 580 wh, ieee80211_mgt_subtype_name[subtype >> 581 IEEE80211_FC0_SUBTYPE_SHIFT], 582 "%s", "WEP set but not permitted"); 583 ic->ic_stats.is_rx_mgtdiscard++; /* XXX */ 584 goto out; 585 } 586 if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { 587 /* 588 * Discard encrypted frames when privacy is off. 589 */ 590 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 591 wh, "mgt", "%s", "WEP set but PRIVACY off"); 592 ic->ic_stats.is_rx_noprivacy++; 593 goto out; 594 } 595 hdrspace = ieee80211_hdrspace(ic, wh); 596 key = ieee80211_crypto_decap(ic, ni, m, hdrspace); 597 if (key == NULL) { 598 /* NB: stats+msgs handled in crypto_decap */ 599 goto out; 600 } 601 wh = mtod(m, struct ieee80211_frame *); 602 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 603 } 604 bpf_mtap3(ic->ic_rawbpf, m); 605 (*ic->ic_recv_mgmt)(ic, m, ni, subtype, rssi, rstamp); 606 m_freem(m); 607 return type; 608 609 case IEEE80211_FC0_TYPE_CTL: 610 IEEE80211_NODE_STAT(ni, rx_ctrl); 611 ic->ic_stats.is_rx_ctl++; 612 #ifndef IEEE80211_NO_HOSTAP 613 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 614 switch (subtype) { 615 case IEEE80211_FC0_SUBTYPE_PS_POLL: 616 ieee80211_recv_pspoll(ic, ni, m); 617 break; 618 } 619 } 620 #endif /* !IEEE80211_NO_HOSTAP */ 621 goto out; 622 default: 623 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 624 wh, NULL, "bad frame type 0x%x", type); 625 /* should not come here */ 626 break; 627 } 628 err: 629 ifp->if_ierrors++; 630 out: 631 if (m != NULL) { 632 bpf_mtap3(ic->ic_rawbpf, m); 633 m_freem(m); 634 } 635 return type; 636 #undef SEQ_LEQ 637 } 638 639 /* 640 * This function reassemble fragments. 641 */ 642 static struct mbuf * 643 ieee80211_defrag(struct ieee80211com *ic, struct ieee80211_node *ni, 644 struct mbuf *m, int hdrspace) 645 { 646 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 647 struct ieee80211_frame *lwh; 648 u_int16_t rxseq; 649 u_int8_t fragno; 650 u_int8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 651 struct mbuf *mfrag; 652 653 IASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 654 655 rxseq = le16toh(*(u_int16_t *)wh->i_seq); 656 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 657 658 /* Quick way out, if there's nothing to defragment */ 659 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 660 return m; 661 662 /* 663 * Remove frag to insure it doesn't get reaped by timer. 664 */ 665 if (ni->ni_table == NULL) { 666 /* 667 * Should never happen. If the node is orphaned (not in 668 * the table) then input packets should not reach here. 669 * Otherwise, a concurrent request that yanks the table 670 * should be blocked by other interlocking and/or by first 671 * shutting the driver down. Regardless, be defensive 672 * here and just bail 673 */ 674 /* XXX need msg+stat */ 675 m_freem(m); 676 return NULL; 677 } 678 IEEE80211_NODE_LOCK(ni->ni_table); 679 mfrag = ni->ni_rxfrag[0]; 680 ni->ni_rxfrag[0] = NULL; 681 IEEE80211_NODE_UNLOCK(ni->ni_table); 682 683 /* 684 * Validate new fragment is in order and 685 * related to the previous ones. 686 */ 687 if (mfrag != NULL) { 688 u_int16_t last_rxseq; 689 690 lwh = mtod(mfrag, struct ieee80211_frame *); 691 last_rxseq = le16toh(*(u_int16_t *)lwh->i_seq); 692 /* NB: check seq # and frag together */ 693 if (rxseq != last_rxseq+1 || 694 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || 695 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 696 /* 697 * Unrelated fragment or no space for it, 698 * clear current fragments. 699 */ 700 m_freem(mfrag); 701 mfrag = NULL; 702 } 703 } 704 705 if (mfrag == NULL) { 706 if (fragno != 0) { /* !first fragment, discard */ 707 IEEE80211_NODE_STAT(ni, rx_defrag); 708 m_freem(m); 709 return NULL; 710 } 711 mfrag = m; 712 } else { /* concatenate */ 713 m_adj(m, hdrspace); /* strip header */ 714 m_cat(mfrag, m); 715 /* NB: m_cat doesn't update the packet header */ 716 mfrag->m_pkthdr.len += m->m_pkthdr.len; 717 /* track last seqnum and fragno */ 718 lwh = mtod(mfrag, struct ieee80211_frame *); 719 *(u_int16_t *) lwh->i_seq = *(u_int16_t *) wh->i_seq; 720 } 721 if (more_frag) { /* more to come, save */ 722 ni->ni_rxfragstamp = ticks; 723 ni->ni_rxfrag[0] = mfrag; 724 mfrag = NULL; 725 } 726 return mfrag; 727 } 728 729 static void 730 ieee80211_deliver_data(struct ieee80211com *ic, 731 struct ieee80211_node *ni, struct mbuf *m) 732 { 733 struct ether_header *eh = mtod(m, struct ether_header *); 734 struct ifnet *ifp = ic->ic_ifp; 735 int error; 736 737 /* perform as a bridge within the AP */ 738 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 739 (ic->ic_flags & IEEE80211_F_NOBRIDGE) == 0) { 740 struct mbuf *m1 = NULL; 741 742 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 743 m1 = m_copypacket(m, M_DONTWAIT); 744 if (m1 == NULL) 745 ifp->if_oerrors++; 746 else 747 m1->m_flags |= M_MCAST; 748 } else { 749 /* 750 * Check if the destination is known; if so 751 * and the port is authorized dispatch directly. 752 */ 753 struct ieee80211_node *sta = 754 ieee80211_find_node(&ic->ic_sta, eh->ether_dhost); 755 if (sta != NULL) { 756 if (ieee80211_node_is_authorized(sta)) { 757 /* 758 * Beware of sending to ourself; this 759 * needs to happen via the normal 760 * input path. 761 */ 762 if (sta != ic->ic_bss) { 763 m1 = m; 764 m = NULL; 765 } 766 } else { 767 ic->ic_stats.is_rx_unauth++; 768 IEEE80211_NODE_STAT(sta, rx_unauth); 769 } 770 ieee80211_free_node(sta); 771 } 772 } 773 if (m1 != NULL) { 774 int len; 775 #ifdef ALTQ 776 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 777 altq_etherclassify(&ifp->if_snd, m1); 778 } 779 #endif 780 len = m1->m_pkthdr.len; 781 IFQ_ENQUEUE(&ifp->if_snd, m1, error); 782 if (error) { 783 ifp->if_oerrors++; 784 m = NULL; 785 } 786 ifp->if_obytes += len; 787 } 788 } 789 if (m != NULL) { 790 791 if (ni->ni_vlan != 0) 792 vlan_set_tag(m, ni->ni_vlan); 793 794 /* 795 * XXX once ieee80211_input (or rxintr itself) runs in softint 796 * we have to change here too to use if_input. 797 */ 798 KASSERT(ifp->if_percpuq); 799 if_percpuq_enqueue(ifp->if_percpuq, m); 800 } 801 return; 802 } 803 804 static struct mbuf * 805 ieee80211_decap(struct ieee80211com *ic, struct mbuf *m, int hdrlen) 806 { 807 struct ieee80211_qosframe_addr4 wh; /* Max size address frames */ 808 struct ether_header *eh; 809 struct llc *llc; 810 811 if (m->m_len < hdrlen + sizeof(*llc) && 812 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 813 /* XXX stat, msg */ 814 return NULL; 815 } 816 memcpy(&wh, mtod(m, void *), hdrlen); 817 llc = (struct llc *)(mtod(m, char *) + hdrlen); 818 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 819 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 820 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0) { 821 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 822 llc = NULL; 823 } else { 824 m_adj(m, hdrlen - sizeof(*eh)); 825 } 826 eh = mtod(m, struct ether_header *); 827 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 828 case IEEE80211_FC1_DIR_NODS: 829 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 830 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 831 break; 832 case IEEE80211_FC1_DIR_TODS: 833 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 834 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 835 break; 836 case IEEE80211_FC1_DIR_FROMDS: 837 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 838 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 839 break; 840 case IEEE80211_FC1_DIR_DSTODS: 841 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 842 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 843 break; 844 } 845 #ifdef ALIGNED_POINTER 846 if (!ALIGNED_POINTER(mtod(m, char *) + sizeof(*eh), u_int32_t)) { 847 struct mbuf *n, *n0, **np; 848 char *newdata; 849 int off, pktlen; 850 851 n0 = NULL; 852 np = &n0; 853 off = 0; 854 pktlen = m->m_pkthdr.len; 855 while (pktlen > off) { 856 if (n0 == NULL) { 857 MGETHDR(n, M_DONTWAIT, MT_DATA); 858 if (n == NULL) { 859 m_freem(m); 860 return NULL; 861 } 862 M_MOVE_PKTHDR(n, m); 863 n->m_len = MHLEN; 864 } else { 865 MGET(n, M_DONTWAIT, MT_DATA); 866 if (n == NULL) { 867 m_freem(m); 868 m_freem(n0); 869 return NULL; 870 } 871 n->m_len = MLEN; 872 } 873 if (pktlen - off >= MINCLSIZE) { 874 MCLGET(n, M_DONTWAIT); 875 if (n->m_flags & M_EXT) 876 n->m_len = n->m_ext.ext_size; 877 } 878 if (n0 == NULL) { 879 newdata = 880 (char *)ALIGN(n->m_data + sizeof(*eh)) - 881 sizeof(*eh); 882 n->m_len -= newdata - n->m_data; 883 n->m_data = newdata; 884 } 885 if (n->m_len > pktlen - off) 886 n->m_len = pktlen - off; 887 m_copydata(m, off, n->m_len, mtod(n, void *)); 888 off += n->m_len; 889 *np = n; 890 np = &n->m_next; 891 } 892 m_freem(m); 893 m = n0; 894 } 895 #endif /* ALIGNED_POINTER */ 896 if (llc != NULL) { 897 eh = mtod(m, struct ether_header *); 898 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 899 } 900 return m; 901 } 902 903 /* 904 * Install received rate set information in the node's state block. 905 */ 906 int 907 ieee80211_setup_rates(struct ieee80211_node *ni, 908 const u_int8_t *rates, const u_int8_t *xrates, int flags) 909 { 910 struct ieee80211com *ic = ni->ni_ic; 911 struct ieee80211_rateset *rs = &ni->ni_rates; 912 913 memset(rs, 0, sizeof(*rs)); 914 rs->rs_nrates = rates[1]; 915 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 916 if (xrates != NULL) { 917 u_int8_t nxrates; 918 /* 919 * Tack on 11g extended supported rate element. 920 */ 921 nxrates = xrates[1]; 922 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 923 IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); 924 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 925 IEEE80211_DPRINTF(ic, IEEE80211_MSG_XRATE, 926 "[%s] extended rate set too large;" 927 " only using %u of %u rates\n", 928 ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), 929 nxrates, xrates[1]); 930 ic->ic_stats.is_rx_rstoobig++; 931 } 932 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 933 rs->rs_nrates += nxrates; 934 } 935 return ieee80211_fix_rate(ni, flags); 936 } 937 938 static void 939 ieee80211_auth_open(struct ieee80211com *ic, struct ieee80211_frame *wh, 940 struct ieee80211_node *ni, int rssi, u_int32_t rstamp, 941 u_int16_t seq, u_int16_t status) 942 { 943 IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); 944 945 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 946 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 947 ni->ni_macaddr, "open auth", 948 "bad sta auth mode %u", ni->ni_authmode); 949 ic->ic_stats.is_rx_bad_auth++; /* XXX */ 950 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 951 /* XXX hack to workaround calling convention */ 952 ieee80211_send_error(ic, ni, wh->i_addr2, 953 IEEE80211_FC0_SUBTYPE_AUTH, 954 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 955 } 956 return; 957 } 958 switch (ic->ic_opmode) { 959 case IEEE80211_M_IBSS: 960 case IEEE80211_M_AHDEMO: 961 case IEEE80211_M_MONITOR: 962 /* should not come here */ 963 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 964 ni->ni_macaddr, "open auth", 965 "bad operating mode %u", ic->ic_opmode); 966 break; 967 968 case IEEE80211_M_HOSTAP: 969 #ifndef IEEE80211_NO_HOSTAP 970 if (ic->ic_state != IEEE80211_S_RUN || 971 seq != IEEE80211_AUTH_OPEN_REQUEST) { 972 ic->ic_stats.is_rx_bad_auth++; 973 return; 974 } 975 /* always accept open authentication requests */ 976 if (ni == ic->ic_bss) { 977 ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2); 978 if (ni == NULL) 979 return; 980 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 981 (void) ieee80211_ref_node(ni); 982 /* 983 * Mark the node as referenced to reflect that its 984 * reference count has been bumped to insure it remains 985 * after the transaction completes. 986 */ 987 ni->ni_flags |= IEEE80211_NODE_AREF; 988 989 IEEE80211_SEND_MGMT(ic, ni, 990 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 991 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 992 "[%s] station authenticated (open)\n", 993 ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr)); 994 /* 995 * When 802.1x is not in use mark the port 996 * authorized at this point so traffic can flow. 997 */ 998 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 999 ieee80211_node_authorize(ni); 1000 #endif /* !IEEE80211_NO_HOSTAP */ 1001 break; 1002 1003 case IEEE80211_M_STA: 1004 if (ic->ic_state != IEEE80211_S_AUTH || 1005 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 1006 ic->ic_stats.is_rx_bad_auth++; 1007 return; 1008 } 1009 if (status != 0) { 1010 1011 IEEE80211_DPRINTF(ic, 1012 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1013 "[%s] open auth failed (reason %d)\n", 1014 ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), 1015 status); 1016 /* XXX can this happen? */ 1017 if (ni != ic->ic_bss) 1018 ni->ni_fails++; 1019 ic->ic_stats.is_rx_auth_fail++; 1020 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 1021 } else 1022 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 1023 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 1024 break; 1025 } 1026 } 1027 1028 /* 1029 * Send a management frame error response to the specified 1030 * station. If ni is associated with the station then use 1031 * it; otherwise allocate a temporary node suitable for 1032 * transmitting the frame and then free the reference so 1033 * it will go away as soon as the frame has been transmitted. 1034 */ 1035 static void 1036 ieee80211_send_error(struct ieee80211com *ic, struct ieee80211_node *ni, 1037 const u_int8_t *mac, int subtype, int arg) 1038 { 1039 int istmp; 1040 1041 if (ni == ic->ic_bss) { 1042 ni = ieee80211_tmp_node(ic, mac); 1043 if (ni == NULL) { 1044 /* XXX msg */ 1045 return; 1046 } 1047 istmp = 1; 1048 } else 1049 istmp = 0; 1050 IEEE80211_SEND_MGMT(ic, ni, subtype, arg); 1051 if (istmp) 1052 ieee80211_free_node(ni); 1053 } 1054 1055 static int 1056 alloc_challenge(struct ieee80211com *ic, struct ieee80211_node *ni) 1057 { 1058 if (ni->ni_challenge == NULL) 1059 ni->ni_challenge = malloc(IEEE80211_CHALLENGE_LEN, 1060 M_DEVBUF, M_NOWAIT); 1061 if (ni->ni_challenge == NULL) { 1062 IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); 1063 1064 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1065 "[%s] shared key challenge alloc failed\n", 1066 ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr)); 1067 /* XXX statistic */ 1068 } 1069 return (ni->ni_challenge != NULL); 1070 } 1071 1072 /* XXX TODO: add statistics */ 1073 static void 1074 ieee80211_auth_shared(struct ieee80211com *ic, struct ieee80211_frame *wh, 1075 u_int8_t *frm, u_int8_t *efrm, struct ieee80211_node *ni, int rssi, 1076 u_int32_t rstamp, u_int16_t seq, u_int16_t status) 1077 { 1078 u_int8_t *challenge; 1079 int estatus; 1080 IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); 1081 1082 /* 1083 * NB: this can happen as we allow pre-shared key 1084 * authentication to be enabled w/o wep being turned 1085 * on so that configuration of these can be done 1086 * in any order. It may be better to enforce the 1087 * ordering in which case this check would just be 1088 * for sanity/consistency. 1089 */ 1090 if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { 1091 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1092 ni->ni_macaddr, "shared key auth", 1093 "%s", " PRIVACY is disabled"); 1094 estatus = IEEE80211_STATUS_ALG; 1095 goto bad; 1096 } 1097 /* 1098 * Pre-shared key authentication is evil; accept 1099 * it only if explicitly configured (it is supported 1100 * mainly for compatibility with clients like OS X). 1101 */ 1102 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1103 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1104 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1105 ni->ni_macaddr, "shared key auth", 1106 "bad sta auth mode %u", ni->ni_authmode); 1107 ic->ic_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1108 estatus = IEEE80211_STATUS_ALG; 1109 goto bad; 1110 } 1111 1112 challenge = NULL; 1113 if (frm + 1 < efrm) { 1114 if ((frm[1] + 2) > (efrm - frm)) { 1115 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1116 ni->ni_macaddr, "shared key auth", 1117 "ie %d/%d too long", 1118 frm[0], (frm[1] + 2) - (efrm - frm)); 1119 ic->ic_stats.is_rx_bad_auth++; 1120 estatus = IEEE80211_STATUS_CHALLENGE; 1121 goto bad; 1122 } 1123 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1124 challenge = frm; 1125 frm += frm[1] + 2; 1126 } 1127 switch (seq) { 1128 case IEEE80211_AUTH_SHARED_CHALLENGE: 1129 case IEEE80211_AUTH_SHARED_RESPONSE: 1130 if (challenge == NULL) { 1131 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1132 ni->ni_macaddr, "shared key auth", 1133 "%s", "no challenge"); 1134 ic->ic_stats.is_rx_bad_auth++; 1135 estatus = IEEE80211_STATUS_CHALLENGE; 1136 goto bad; 1137 } 1138 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1139 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1140 ni->ni_macaddr, "shared key auth", 1141 "bad challenge len %d", challenge[1]); 1142 ic->ic_stats.is_rx_bad_auth++; 1143 estatus = IEEE80211_STATUS_CHALLENGE; 1144 goto bad; 1145 } 1146 default: 1147 break; 1148 } 1149 switch (ic->ic_opmode) { 1150 case IEEE80211_M_MONITOR: 1151 case IEEE80211_M_AHDEMO: 1152 case IEEE80211_M_IBSS: 1153 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1154 ni->ni_macaddr, "shared key auth", 1155 "bad operating mode %u", ic->ic_opmode); 1156 return; 1157 case IEEE80211_M_HOSTAP: 1158 #ifndef IEEE80211_NO_HOSTAP 1159 { 1160 int allocbs; 1161 if (ic->ic_state != IEEE80211_S_RUN) { 1162 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1163 ni->ni_macaddr, "shared key auth", 1164 "bad state %u", ic->ic_state); 1165 estatus = IEEE80211_STATUS_ALG; /* XXX */ 1166 goto bad; 1167 } 1168 switch (seq) { 1169 case IEEE80211_AUTH_SHARED_REQUEST: 1170 if (ni == ic->ic_bss) { 1171 ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2); 1172 if (ni == NULL) { 1173 /* NB: no way to return an error */ 1174 return; 1175 } 1176 allocbs = 1; 1177 } else { 1178 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1179 (void) ieee80211_ref_node(ni); 1180 allocbs = 0; 1181 } 1182 __USE(allocbs); 1183 /* 1184 * Mark the node as referenced to reflect that its 1185 * reference count has been bumped to insure it remains 1186 * after the transaction completes. 1187 */ 1188 ni->ni_flags |= IEEE80211_NODE_AREF; 1189 ni->ni_rssi = rssi; 1190 ni->ni_rstamp = rstamp; 1191 if (!alloc_challenge(ic, ni)) { 1192 /* NB: don't return error so they rexmit */ 1193 return; 1194 } 1195 get_random_bytes(ni->ni_challenge, 1196 IEEE80211_CHALLENGE_LEN); 1197 IEEE80211_DPRINTF(ic, 1198 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1199 "[%s] shared key %sauth request\n", 1200 ether_snprintf(ebuf, sizeof(ebuf), 1201 ni->ni_macaddr), 1202 allocbs ? "" : "re"); 1203 break; 1204 case IEEE80211_AUTH_SHARED_RESPONSE: 1205 if (ni == ic->ic_bss) { 1206 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1207 ni->ni_macaddr, "shared key response", 1208 "%s", "unknown station"); 1209 /* NB: don't send a response */ 1210 return; 1211 } 1212 if (ni->ni_challenge == NULL) { 1213 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1214 ni->ni_macaddr, "shared key response", 1215 "%s", "no challenge recorded"); 1216 ic->ic_stats.is_rx_bad_auth++; 1217 estatus = IEEE80211_STATUS_CHALLENGE; 1218 goto bad; 1219 } 1220 if (memcmp(ni->ni_challenge, &challenge[2], 1221 challenge[1]) != 0) { 1222 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1223 ni->ni_macaddr, "shared key response", 1224 "%s", "challenge mismatch"); 1225 ic->ic_stats.is_rx_auth_fail++; 1226 estatus = IEEE80211_STATUS_CHALLENGE; 1227 goto bad; 1228 } 1229 IEEE80211_DPRINTF(ic, 1230 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1231 "[%s] station authenticated (shared key)\n", 1232 ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr)); 1233 ieee80211_node_authorize(ni); 1234 break; 1235 default: 1236 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1237 ni->ni_macaddr, "shared key auth", 1238 "bad seq %d", seq); 1239 ic->ic_stats.is_rx_bad_auth++; 1240 estatus = IEEE80211_STATUS_SEQUENCE; 1241 goto bad; 1242 } 1243 IEEE80211_SEND_MGMT(ic, ni, 1244 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1245 } 1246 #endif /* !IEEE80211_NO_HOSTAP */ 1247 break; 1248 1249 case IEEE80211_M_STA: 1250 if (ic->ic_state != IEEE80211_S_AUTH) 1251 return; 1252 switch (seq) { 1253 case IEEE80211_AUTH_SHARED_PASS: 1254 if (ni->ni_challenge != NULL) { 1255 free(ni->ni_challenge, M_DEVBUF); 1256 ni->ni_challenge = NULL; 1257 } 1258 if (status != 0) { 1259 IEEE80211_DPRINTF(ic, 1260 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1261 "[%s] shared key auth failed (reason %d)\n", 1262 ether_snprintf(ebuf, sizeof(ebuf), 1263 ieee80211_getbssid(ic, wh)), 1264 status); 1265 /* XXX can this happen? */ 1266 if (ni != ic->ic_bss) 1267 ni->ni_fails++; 1268 ic->ic_stats.is_rx_auth_fail++; 1269 return; 1270 } 1271 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 1272 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 1273 break; 1274 case IEEE80211_AUTH_SHARED_CHALLENGE: 1275 if (!alloc_challenge(ic, ni)) 1276 return; 1277 /* XXX could optimize by passing recvd challenge */ 1278 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1279 IEEE80211_SEND_MGMT(ic, ni, 1280 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1281 break; 1282 default: 1283 IEEE80211_DISCARD(ic, IEEE80211_MSG_AUTH, 1284 wh, "shared key auth", "bad seq %d", seq); 1285 ic->ic_stats.is_rx_bad_auth++; 1286 return; 1287 } 1288 break; 1289 } 1290 return; 1291 bad: 1292 #ifndef IEEE80211_NO_HOSTAP 1293 /* 1294 * Send an error response; but only when operating as an AP. 1295 */ 1296 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 1297 /* XXX hack to workaround calling convention */ 1298 ieee80211_send_error(ic, ni, wh->i_addr2, 1299 IEEE80211_FC0_SUBTYPE_AUTH, 1300 (seq + 1) | (estatus<<16)); 1301 } else if (ic->ic_opmode == IEEE80211_M_STA) { 1302 /* 1303 * Kick the state machine. This short-circuits 1304 * using the mgt frame timeout to trigger the 1305 * state transition. 1306 */ 1307 if (ic->ic_state == IEEE80211_S_AUTH) 1308 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 1309 } 1310 #else 1311 ; 1312 #endif /* !IEEE80211_NO_HOSTAP */ 1313 } 1314 1315 /* Verify the existence and length of __elem or get out. */ 1316 #define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen) do { \ 1317 if ((__elem) == NULL) { \ 1318 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ 1319 wh, ieee80211_mgt_subtype_name[subtype >> \ 1320 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1321 "%s", "no " #__elem ); \ 1322 ic->ic_stats.is_rx_elem_missing++; \ 1323 return; \ 1324 } \ 1325 if ((__elem)[1] > (__maxlen)) { \ 1326 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ 1327 wh, ieee80211_mgt_subtype_name[subtype >> \ 1328 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1329 "bad " #__elem " len %d", (__elem)[1]); \ 1330 ic->ic_stats.is_rx_elem_toobig++; \ 1331 return; \ 1332 } \ 1333 } while (0) 1334 1335 #define IEEE80211_VERIFY_LENGTH(_len, _minlen) do { \ 1336 if ((_len) < (_minlen)) { \ 1337 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ 1338 wh, ieee80211_mgt_subtype_name[subtype >> \ 1339 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1340 "%s", "ie too short"); \ 1341 ic->ic_stats.is_rx_elem_toosmall++; \ 1342 return; \ 1343 } \ 1344 } while (0) 1345 1346 #ifdef IEEE80211_DEBUG 1347 static void 1348 ieee80211_ssid_mismatch(struct ieee80211com *ic, const char *tag, 1349 u_int8_t mac[IEEE80211_ADDR_LEN], u_int8_t *ssid) 1350 { 1351 char ebuf[3 * ETHER_ADDR_LEN]; 1352 1353 printf("[%s] discard %s frame, ssid mismatch: ", 1354 ether_snprintf(ebuf, sizeof(ebuf), mac), tag); 1355 ieee80211_print_essid(ssid + 2, ssid[1]); 1356 printf("\n"); 1357 } 1358 1359 #define IEEE80211_VERIFY_SSID(_ni, _ssid) do { \ 1360 if ((_ssid)[1] != 0 && \ 1361 ((_ssid)[1] != (_ni)->ni_esslen || \ 1362 memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \ 1363 if (ieee80211_msg_input(ic)) \ 1364 ieee80211_ssid_mismatch(ic, \ 1365 ieee80211_mgt_subtype_name[subtype >> \ 1366 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1367 wh->i_addr2, _ssid); \ 1368 ic->ic_stats.is_rx_ssidmismatch++; \ 1369 return; \ 1370 } \ 1371 } while (0) 1372 #else /* !IEEE80211_DEBUG */ 1373 #define IEEE80211_VERIFY_SSID(_ni, _ssid) do { \ 1374 if ((_ssid)[1] != 0 && \ 1375 ((_ssid)[1] != (_ni)->ni_esslen || \ 1376 memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \ 1377 ic->ic_stats.is_rx_ssidmismatch++; \ 1378 return; \ 1379 } \ 1380 } while (0) 1381 #endif /* !IEEE80211_DEBUG */ 1382 1383 /* unaligned little endian access */ 1384 #define LE_READ_2(p) \ 1385 ((u_int16_t) \ 1386 ((((const u_int8_t *)(p))[0] ) | \ 1387 (((const u_int8_t *)(p))[1] << 8))) 1388 #define LE_READ_4(p) \ 1389 ((u_int32_t) \ 1390 ((((const u_int8_t *)(p))[0] ) | \ 1391 (((const u_int8_t *)(p))[1] << 8) | \ 1392 (((const u_int8_t *)(p))[2] << 16) | \ 1393 (((const u_int8_t *)(p))[3] << 24))) 1394 1395 static __inline int 1396 iswpaoui(const u_int8_t *frm) 1397 { 1398 return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI); 1399 } 1400 1401 static __inline int 1402 iswmeoui(const u_int8_t *frm) 1403 { 1404 return frm[1] > 3 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI); 1405 } 1406 1407 static __inline int 1408 iswmeparam(const u_int8_t *frm) 1409 { 1410 return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) && 1411 frm[6] == WME_PARAM_OUI_SUBTYPE; 1412 } 1413 1414 static __inline int 1415 iswmeinfo(const u_int8_t *frm) 1416 { 1417 return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) && 1418 frm[6] == WME_INFO_OUI_SUBTYPE; 1419 } 1420 1421 /* 1422 * Convert a WPA cipher selector OUI to an internal 1423 * cipher algorithm. Where appropriate we also 1424 * record any key length. 1425 */ 1426 static int 1427 wpa_cipher(u_int8_t *sel, u_int8_t *keylen) 1428 { 1429 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1430 u_int32_t w = LE_READ_4(sel); 1431 1432 switch (w) { 1433 case WPA_SEL(WPA_CSE_NULL): 1434 return IEEE80211_CIPHER_NONE; 1435 case WPA_SEL(WPA_CSE_WEP40): 1436 if (keylen) 1437 *keylen = 40 / NBBY; 1438 return IEEE80211_CIPHER_WEP; 1439 case WPA_SEL(WPA_CSE_WEP104): 1440 if (keylen) 1441 *keylen = 104 / NBBY; 1442 return IEEE80211_CIPHER_WEP; 1443 case WPA_SEL(WPA_CSE_TKIP): 1444 return IEEE80211_CIPHER_TKIP; 1445 case WPA_SEL(WPA_CSE_CCMP): 1446 return IEEE80211_CIPHER_AES_CCM; 1447 } 1448 return 32; /* NB: so 1<< is discarded */ 1449 #undef WPA_SEL 1450 } 1451 1452 /* 1453 * Convert a WPA key management/authentication algorithm 1454 * to an internal code. 1455 */ 1456 static int 1457 wpa_keymgmt(u_int8_t *sel) 1458 { 1459 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1460 u_int32_t w = LE_READ_4(sel); 1461 1462 switch (w) { 1463 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1464 return WPA_ASE_8021X_UNSPEC; 1465 case WPA_SEL(WPA_ASE_8021X_PSK): 1466 return WPA_ASE_8021X_PSK; 1467 case WPA_SEL(WPA_ASE_NONE): 1468 return WPA_ASE_NONE; 1469 } 1470 return 0; /* NB: so is discarded */ 1471 #undef WPA_SEL 1472 } 1473 1474 /* 1475 * Parse a WPA information element to collect parameters 1476 * and validate the parameters against what has been 1477 * configured for the system. 1478 */ 1479 static int 1480 ieee80211_parse_wpa(struct ieee80211com *ic, u_int8_t *frm, 1481 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1482 { 1483 u_int8_t len = frm[1]; 1484 u_int32_t w; 1485 int n; 1486 1487 /* 1488 * Check the length once for fixed parts: OUI, type, 1489 * version, mcast cipher, and 2 selector counts. 1490 * Other, variable-length data, must be checked separately. 1491 */ 1492 if ((ic->ic_flags & IEEE80211_F_WPA1) == 0) { 1493 IEEE80211_DISCARD_IE(ic, 1494 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1495 wh, "WPA", "not WPA, flags 0x%x", ic->ic_flags); 1496 return IEEE80211_REASON_IE_INVALID; 1497 } 1498 if (len < 14) { 1499 IEEE80211_DISCARD_IE(ic, 1500 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1501 wh, "WPA", "too short, len %u", len); 1502 return IEEE80211_REASON_IE_INVALID; 1503 } 1504 frm += 6, len -= 4; /* NB: len is payload only */ 1505 /* NB: iswapoui already validated the OUI and type */ 1506 w = LE_READ_2(frm); 1507 if (w != WPA_VERSION) { 1508 IEEE80211_DISCARD_IE(ic, 1509 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1510 wh, "WPA", "bad version %u", w); 1511 return IEEE80211_REASON_IE_INVALID; 1512 } 1513 frm += 2, len -= 2; 1514 1515 /* multicast/group cipher */ 1516 w = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1517 if (w != rsn->rsn_mcastcipher) { 1518 IEEE80211_DISCARD_IE(ic, 1519 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1520 wh, "WPA", "mcast cipher mismatch; got %u, expected %u", 1521 w, rsn->rsn_mcastcipher); 1522 return IEEE80211_REASON_IE_INVALID; 1523 } 1524 frm += 4, len -= 4; 1525 1526 /* unicast ciphers */ 1527 n = LE_READ_2(frm); 1528 frm += 2, len -= 2; 1529 if (len < n*4+2) { 1530 IEEE80211_DISCARD_IE(ic, 1531 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1532 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1533 len, n); 1534 return IEEE80211_REASON_IE_INVALID; 1535 } 1536 w = 0; 1537 for (; n > 0; n--) { 1538 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1539 frm += 4, len -= 4; 1540 } 1541 w &= rsn->rsn_ucastcipherset; 1542 if (w == 0) { 1543 IEEE80211_DISCARD_IE(ic, 1544 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1545 wh, "WPA", "%s", "ucast cipher set empty"); 1546 return IEEE80211_REASON_IE_INVALID; 1547 } 1548 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1549 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1550 else 1551 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1552 1553 /* key management algorithms */ 1554 n = LE_READ_2(frm); 1555 frm += 2, len -= 2; 1556 if (len < n*4) { 1557 IEEE80211_DISCARD_IE(ic, 1558 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1559 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1560 len, n); 1561 return IEEE80211_REASON_IE_INVALID; 1562 } 1563 w = 0; 1564 for (; n > 0; n--) { 1565 w |= wpa_keymgmt(frm); 1566 frm += 4, len -= 4; 1567 } 1568 w &= rsn->rsn_keymgmtset; 1569 if (w == 0) { 1570 IEEE80211_DISCARD_IE(ic, 1571 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1572 wh, "WPA", "%s", "no acceptable key mgmt alg"); 1573 return IEEE80211_REASON_IE_INVALID; 1574 } 1575 if (w & WPA_ASE_8021X_UNSPEC) 1576 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1577 else 1578 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1579 1580 if (len > 2) /* optional capabilities */ 1581 rsn->rsn_caps = LE_READ_2(frm); 1582 1583 return 0; 1584 } 1585 1586 /* 1587 * Convert an RSN cipher selector OUI to an internal 1588 * cipher algorithm. Where appropriate we also 1589 * record any key length. 1590 */ 1591 static int 1592 rsn_cipher(u_int8_t *sel, u_int8_t *keylen) 1593 { 1594 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1595 u_int32_t w = LE_READ_4(sel); 1596 1597 switch (w) { 1598 case RSN_SEL(RSN_CSE_NULL): 1599 return IEEE80211_CIPHER_NONE; 1600 case RSN_SEL(RSN_CSE_WEP40): 1601 if (keylen) 1602 *keylen = 40 / NBBY; 1603 return IEEE80211_CIPHER_WEP; 1604 case RSN_SEL(RSN_CSE_WEP104): 1605 if (keylen) 1606 *keylen = 104 / NBBY; 1607 return IEEE80211_CIPHER_WEP; 1608 case RSN_SEL(RSN_CSE_TKIP): 1609 return IEEE80211_CIPHER_TKIP; 1610 case RSN_SEL(RSN_CSE_CCMP): 1611 return IEEE80211_CIPHER_AES_CCM; 1612 case RSN_SEL(RSN_CSE_WRAP): 1613 return IEEE80211_CIPHER_AES_OCB; 1614 } 1615 return 32; /* NB: so 1<< is discarded */ 1616 #undef WPA_SEL 1617 } 1618 1619 /* 1620 * Convert an RSN key management/authentication algorithm 1621 * to an internal code. 1622 */ 1623 static int 1624 rsn_keymgmt(u_int8_t *sel) 1625 { 1626 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1627 u_int32_t w = LE_READ_4(sel); 1628 1629 switch (w) { 1630 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1631 return RSN_ASE_8021X_UNSPEC; 1632 case RSN_SEL(RSN_ASE_8021X_PSK): 1633 return RSN_ASE_8021X_PSK; 1634 case RSN_SEL(RSN_ASE_NONE): 1635 return RSN_ASE_NONE; 1636 } 1637 return 0; /* NB: so is discarded */ 1638 #undef RSN_SEL 1639 } 1640 1641 /* 1642 * Parse a WPA/RSN information element to collect parameters 1643 * and validate the parameters against what has been 1644 * configured for the system. 1645 */ 1646 static int 1647 ieee80211_parse_rsn(struct ieee80211com *ic, u_int8_t *frm, 1648 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1649 { 1650 u_int8_t len = frm[1]; 1651 u_int32_t w; 1652 int n; 1653 1654 /* 1655 * Check the length once for fixed parts: 1656 * version, mcast cipher, and 2 selector counts. 1657 * Other, variable-length data, must be checked separately. 1658 */ 1659 if ((ic->ic_flags & IEEE80211_F_WPA2) == 0) { 1660 IEEE80211_DISCARD_IE(ic, 1661 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1662 wh, "WPA", "not RSN, flags 0x%x", ic->ic_flags); 1663 return IEEE80211_REASON_IE_INVALID; 1664 } 1665 if (len < 10) { 1666 IEEE80211_DISCARD_IE(ic, 1667 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1668 wh, "RSN", "too short, len %u", len); 1669 return IEEE80211_REASON_IE_INVALID; 1670 } 1671 frm += 2; 1672 w = LE_READ_2(frm); 1673 if (w != RSN_VERSION) { 1674 IEEE80211_DISCARD_IE(ic, 1675 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1676 wh, "RSN", "bad version %u", w); 1677 return IEEE80211_REASON_IE_INVALID; 1678 } 1679 frm += 2, len -= 2; 1680 1681 /* multicast/group cipher */ 1682 w = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1683 if (w != rsn->rsn_mcastcipher) { 1684 IEEE80211_DISCARD_IE(ic, 1685 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1686 wh, "RSN", "mcast cipher mismatch; got %u, expected %u", 1687 w, rsn->rsn_mcastcipher); 1688 return IEEE80211_REASON_IE_INVALID; 1689 } 1690 frm += 4, len -= 4; 1691 1692 /* unicast ciphers */ 1693 n = LE_READ_2(frm); 1694 frm += 2, len -= 2; 1695 if (len < n*4+2) { 1696 IEEE80211_DISCARD_IE(ic, 1697 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1698 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1699 len, n); 1700 return IEEE80211_REASON_IE_INVALID; 1701 } 1702 w = 0; 1703 for (; n > 0; n--) { 1704 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1705 frm += 4, len -= 4; 1706 } 1707 w &= rsn->rsn_ucastcipherset; 1708 if (w == 0) { 1709 IEEE80211_DISCARD_IE(ic, 1710 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1711 wh, "RSN", "%s", "ucast cipher set empty"); 1712 return IEEE80211_REASON_IE_INVALID; 1713 } 1714 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1715 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1716 else 1717 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1718 1719 /* key management algorithms */ 1720 n = LE_READ_2(frm); 1721 frm += 2, len -= 2; 1722 if (len < n*4) { 1723 IEEE80211_DISCARD_IE(ic, 1724 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1725 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1726 len, n); 1727 return IEEE80211_REASON_IE_INVALID; 1728 } 1729 w = 0; 1730 for (; n > 0; n--) { 1731 w |= rsn_keymgmt(frm); 1732 frm += 4, len -= 4; 1733 } 1734 w &= rsn->rsn_keymgmtset; 1735 if (w == 0) { 1736 IEEE80211_DISCARD_IE(ic, 1737 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1738 wh, "RSN", "%s", "no acceptable key mgmt alg"); 1739 return IEEE80211_REASON_IE_INVALID; 1740 } 1741 if (w & RSN_ASE_8021X_UNSPEC) 1742 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1743 else 1744 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1745 1746 /* optional RSN capabilities */ 1747 if (len > 2) 1748 rsn->rsn_caps = LE_READ_2(frm); 1749 /* XXXPMKID */ 1750 1751 return 0; 1752 } 1753 1754 static int 1755 ieee80211_parse_wmeparams(struct ieee80211com *ic, u_int8_t *frm, 1756 const struct ieee80211_frame *wh) 1757 { 1758 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1759 struct ieee80211_wme_state *wme = &ic->ic_wme; 1760 u_int len = frm[1], qosinfo; 1761 int i; 1762 1763 if (len < sizeof(struct ieee80211_wme_param)-2) { 1764 IEEE80211_DISCARD_IE(ic, 1765 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1766 wh, "WME", "too short, len %u", len); 1767 return -1; 1768 } 1769 qosinfo = frm[offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1770 qosinfo &= WME_QOSINFO_COUNT; 1771 /* XXX do proper check for wraparound */ 1772 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1773 return 0; 1774 frm += offsetof(struct ieee80211_wme_param, params_acParams); 1775 for (i = 0; i < WME_NUM_AC; i++) { 1776 struct wmeParams *wmep = 1777 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1778 /* NB: ACI not used */ 1779 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1780 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1781 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1782 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1783 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1784 frm += 4; 1785 } 1786 wme->wme_wmeChanParams.cap_info = qosinfo; 1787 return 1; 1788 #undef MS 1789 } 1790 1791 void 1792 ieee80211_saveie(u_int8_t **iep, const u_int8_t *ie) 1793 { 1794 u_int ielen = ie[1]+2; 1795 /* 1796 * Record information element for later use. 1797 */ 1798 if (*iep == NULL || (*iep)[1] != ie[1]) { 1799 if (*iep != NULL) 1800 free(*iep, M_DEVBUF); 1801 *iep = malloc(ielen, M_DEVBUF, M_NOWAIT); 1802 } 1803 if (*iep != NULL) 1804 memcpy(*iep, ie, ielen); 1805 /* XXX note failure */ 1806 } 1807 1808 static void 1809 ieee80211_update_adhoc_node(struct ieee80211com *ic, struct ieee80211_node *ni, 1810 struct ieee80211_frame *wh, struct ieee80211_scanparams *scan, int rssi, 1811 u_int32_t rstamp) 1812 { 1813 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 1814 /* 1815 * Create a new entry in the neighbor table. 1816 * Records the TSF. 1817 */ 1818 if ((ni = ieee80211_add_neighbor(ic, wh, scan)) == NULL) 1819 return; 1820 } else if (ni->ni_capinfo == 0) { 1821 /* 1822 * Initialize a node that was "faked up." Records 1823 * the TSF. 1824 * 1825 * No need to check for a change of BSSID: ni could 1826 * not have been the IBSS (ic_bss) 1827 */ 1828 ieee80211_init_neighbor(ic, ni, wh, scan, 0); 1829 } else { 1830 /* Record TSF for potential resync. */ 1831 memcpy(ni->ni_tstamp.data, scan->tstamp, sizeof(ni->ni_tstamp)); 1832 } 1833 1834 ni->ni_rssi = rssi; 1835 ni->ni_rstamp = rstamp; 1836 1837 /* Mark a neighbor's change of BSSID. */ 1838 if (IEEE80211_ADDR_EQ(wh->i_addr3, ni->ni_bssid)) 1839 return; 1840 1841 IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3); 1842 1843 if (ni != ic->ic_bss) 1844 return; 1845 else if (ic->ic_flags & IEEE80211_F_DESBSSID) { 1846 /* 1847 * Now, ni does not represent a network we 1848 * want to belong to, so start a scan. 1849 */ 1850 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 1851 return; 1852 } else { 1853 /* 1854 * A RUN->RUN transition lets the driver 1855 * reprogram its BSSID filter. 1856 * 1857 * No need to SCAN, we already belong to 1858 * an IBSS that meets our criteria: channel, 1859 * SSID, etc. It could be harmful to scan, 1860 * too: if a scan does not detect nodes 1861 * belonging to my current IBSS, then we 1862 * will create a new IBSS at the end of 1863 * the scan, needlessly splitting the 1864 * network. 1865 */ 1866 ieee80211_new_state(ic, IEEE80211_S_RUN, 0); 1867 } 1868 } 1869 1870 void 1871 ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0, 1872 struct ieee80211_node *ni, 1873 int subtype, int rssi, u_int32_t rstamp) 1874 { 1875 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1876 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1877 struct ieee80211_frame *wh; 1878 u_int8_t *frm, *efrm; 1879 u_int8_t *ssid, *rates, *xrates, *wpa, *wme; 1880 int reassoc, resp, allocbs; 1881 u_int8_t rate; 1882 IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); 1883 1884 wh = mtod(m0, struct ieee80211_frame *); 1885 frm = (u_int8_t *)&wh[1]; 1886 efrm = mtod(m0, u_int8_t *) + m0->m_len; 1887 switch (subtype) { 1888 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1889 case IEEE80211_FC0_SUBTYPE_BEACON: { 1890 struct ieee80211_scanparams scan; 1891 1892 /* 1893 * We process beacon/probe response frames: 1894 * o when scanning, or 1895 * o station mode when associated (to collect state 1896 * updates such as 802.11g slot time), or 1897 * o adhoc mode (to discover neighbors) 1898 * Frames otherwise received are discarded. 1899 */ 1900 if (!((ic->ic_flags & IEEE80211_F_SCAN) || 1901 (ic->ic_opmode == IEEE80211_M_STA && ni->ni_associd) || 1902 ic->ic_opmode == IEEE80211_M_IBSS)) { 1903 ic->ic_stats.is_rx_mgtdiscard++; 1904 return; 1905 } 1906 /* 1907 * beacon/probe response frame format 1908 * [8] time stamp 1909 * [2] beacon interval 1910 * [2] capability information 1911 * [tlv] ssid 1912 * [tlv] supported rates 1913 * [tlv] country information 1914 * [tlv] parameter set (FH/DS) 1915 * [tlv] erp information 1916 * [tlv] extended supported rates 1917 * [tlv] WME 1918 * [tlv] WPA or RSN 1919 */ 1920 IEEE80211_VERIFY_LENGTH(efrm - frm, 12); 1921 memset(&scan, 0, sizeof(scan)); 1922 scan.tstamp = frm; frm += 8; 1923 scan.bintval = le16toh(*(u_int16_t *)frm); frm += 2; 1924 scan.capinfo = le16toh(*(u_int16_t *)frm); frm += 2; 1925 scan.bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 1926 scan.chan = scan.bchan; 1927 1928 while (frm < efrm) { 1929 switch (*frm) { 1930 case IEEE80211_ELEMID_SSID: 1931 scan.ssid = frm; 1932 break; 1933 case IEEE80211_ELEMID_RATES: 1934 scan.rates = frm; 1935 break; 1936 case IEEE80211_ELEMID_COUNTRY: 1937 scan.country = frm; 1938 break; 1939 case IEEE80211_ELEMID_FHPARMS: 1940 if (ic->ic_phytype == IEEE80211_T_FH) { 1941 scan.fhdwell = LE_READ_2(&frm[2]); 1942 scan.chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 1943 scan.fhindex = frm[6]; 1944 } 1945 break; 1946 case IEEE80211_ELEMID_DSPARMS: 1947 /* 1948 * XXX hack this since depending on phytype 1949 * is problematic for multi-mode devices. 1950 */ 1951 if (ic->ic_phytype != IEEE80211_T_FH) 1952 scan.chan = frm[2]; 1953 break; 1954 case IEEE80211_ELEMID_TIM: 1955 /* XXX ATIM? */ 1956 scan.tim = frm; 1957 scan.timoff = frm - mtod(m0, u_int8_t *); 1958 break; 1959 case IEEE80211_ELEMID_IBSSPARMS: 1960 break; 1961 case IEEE80211_ELEMID_XRATES: 1962 scan.xrates = frm; 1963 break; 1964 case IEEE80211_ELEMID_ERP: 1965 if (frm[1] != 1) { 1966 IEEE80211_DISCARD_IE(ic, 1967 IEEE80211_MSG_ELEMID, wh, "ERP", 1968 "bad len %u", frm[1]); 1969 ic->ic_stats.is_rx_elem_toobig++; 1970 break; 1971 } 1972 scan.erp = frm[2]; 1973 break; 1974 case IEEE80211_ELEMID_RSN: 1975 scan.wpa = frm; 1976 break; 1977 case IEEE80211_ELEMID_VENDOR: 1978 if (iswpaoui(frm)) 1979 scan.wpa = frm; 1980 else if (iswmeparam(frm) || iswmeinfo(frm)) 1981 scan.wme = frm; 1982 /* XXX Atheros OUI support */ 1983 break; 1984 default: 1985 IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID, 1986 wh, "unhandled", 1987 "id %u, len %u", *frm, frm[1]); 1988 ic->ic_stats.is_rx_elem_unknown++; 1989 break; 1990 } 1991 frm += frm[1] + 2; 1992 } 1993 IEEE80211_VERIFY_ELEMENT(scan.rates, IEEE80211_RATE_MAXSIZE); 1994 IEEE80211_VERIFY_ELEMENT(scan.ssid, IEEE80211_NWID_LEN); 1995 if ( 1996 #if IEEE80211_CHAN_MAX < 255 1997 scan.chan > IEEE80211_CHAN_MAX || 1998 #endif 1999 isclr(ic->ic_chan_active, scan.chan)) { 2000 IEEE80211_DISCARD(ic, 2001 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 2002 wh, ieee80211_mgt_subtype_name[subtype >> 2003 IEEE80211_FC0_SUBTYPE_SHIFT], 2004 "invalid channel %u", scan.chan); 2005 ic->ic_stats.is_rx_badchan++; 2006 return; 2007 } 2008 if (scan.chan != scan.bchan && 2009 ic->ic_phytype != IEEE80211_T_FH) { 2010 /* 2011 * Frame was received on a channel different from the 2012 * one indicated in the DS params element id; 2013 * silently discard it. 2014 * 2015 * NB: this can happen due to signal leakage. 2016 * But we should take it for FH phy because 2017 * the rssi value should be correct even for 2018 * different hop pattern in FH. 2019 */ 2020 IEEE80211_DISCARD(ic, 2021 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 2022 wh, ieee80211_mgt_subtype_name[subtype >> 2023 IEEE80211_FC0_SUBTYPE_SHIFT], 2024 "for off-channel %u", scan.chan); 2025 ic->ic_stats.is_rx_chanmismatch++; 2026 return; 2027 } 2028 if (!(IEEE80211_BINTVAL_MIN <= scan.bintval && 2029 scan.bintval <= IEEE80211_BINTVAL_MAX)) { 2030 IEEE80211_DISCARD(ic, 2031 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 2032 wh, ieee80211_mgt_subtype_name[subtype >> 2033 IEEE80211_FC0_SUBTYPE_SHIFT], 2034 "bogus beacon interval", scan.bintval); 2035 ic->ic_stats.is_rx_badbintval++; 2036 return; 2037 } 2038 2039 if (ni != ic->ic_bss) { 2040 ni = ieee80211_refine_node_for_beacon(ic, ni, 2041 &ic->ic_channels[scan.chan], scan.ssid); 2042 } 2043 /* 2044 * Count frame now that we know it's to be processed. 2045 */ 2046 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 2047 ic->ic_stats.is_rx_beacon++; /* XXX remove */ 2048 IEEE80211_NODE_STAT(ni, rx_beacons); 2049 } else 2050 IEEE80211_NODE_STAT(ni, rx_proberesp); 2051 2052 /* 2053 * When operating in station mode, check for state updates. 2054 * Be careful to ignore beacons received while doing a 2055 * background scan. We consider only 11g/WMM stuff right now. 2056 */ 2057 if (ic->ic_opmode == IEEE80211_M_STA && 2058 ni->ni_associd != 0 && 2059 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 2060 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 2061 /* record tsf of last beacon */ 2062 memcpy(ni->ni_tstamp.data, scan.tstamp, 2063 sizeof(ni->ni_tstamp)); 2064 if (ni->ni_erp != scan.erp) { 2065 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2066 "[%s] erp change: was 0x%x, now 0x%x\n", 2067 ether_snprintf(ebuf, sizeof(ebuf), 2068 wh->i_addr2), ni->ni_erp, scan.erp); 2069 if (ic->ic_curmode == IEEE80211_MODE_11G && 2070 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 2071 ic->ic_flags |= IEEE80211_F_USEPROT; 2072 else 2073 ic->ic_flags &= ~IEEE80211_F_USEPROT; 2074 ni->ni_erp = scan.erp; 2075 /* XXX statistic */ 2076 } 2077 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 2078 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2079 "[%s] capabilities change: before 0x%x," 2080 " now 0x%x\n", 2081 ether_snprintf(ebuf, sizeof(ebuf), 2082 wh->i_addr2), 2083 ni->ni_capinfo, scan.capinfo); 2084 /* 2085 * NB: we assume short preamble doesn't 2086 * change dynamically 2087 */ 2088 ieee80211_set_shortslottime(ic, 2089 ic->ic_curmode == IEEE80211_MODE_11A || 2090 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 2091 ni->ni_capinfo = scan.capinfo; 2092 /* XXX statistic */ 2093 } 2094 if (scan.wme != NULL && 2095 (ni->ni_flags & IEEE80211_NODE_QOS) && 2096 ieee80211_parse_wmeparams(ic, scan.wme, wh) > 0) 2097 ieee80211_wme_updateparams(ic); 2098 if (scan.tim != NULL) { 2099 struct ieee80211_tim_ie *ie = 2100 (struct ieee80211_tim_ie *) scan.tim; 2101 2102 ni->ni_dtim_count = ie->tim_count; 2103 ni->ni_dtim_period = ie->tim_period; 2104 } 2105 if (ic->ic_flags & IEEE80211_F_SCAN) 2106 ieee80211_add_scan(ic, &scan, wh, 2107 subtype, rssi, rstamp); 2108 ic->ic_bmiss_count = 0; 2109 return; 2110 } 2111 /* 2112 * If scanning, just pass information to the scan module. 2113 */ 2114 if (ic->ic_flags & IEEE80211_F_SCAN) { 2115 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 2116 /* 2117 * Actively scanning a channel marked passive; 2118 * send a probe request now that we know there 2119 * is 802.11 traffic present. 2120 * 2121 * XXX check if the beacon we recv'd gives 2122 * us what we need and suppress the probe req 2123 */ 2124 ieee80211_probe_curchan(ic, 1); 2125 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 2126 } 2127 ieee80211_add_scan(ic, &scan, wh, 2128 subtype, rssi, rstamp); 2129 return; 2130 } 2131 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) 2132 ieee80211_update_adhoc_node(ic, ni, wh, &scan, rssi, 2133 rstamp); 2134 break; 2135 } 2136 2137 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 2138 if (ic->ic_opmode == IEEE80211_M_STA || 2139 ic->ic_state != IEEE80211_S_RUN) { 2140 ic->ic_stats.is_rx_mgtdiscard++; 2141 return; 2142 } 2143 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 2144 /* frame must be directed */ 2145 ic->ic_stats.is_rx_mgtdiscard++; /* XXX stat */ 2146 return; 2147 } 2148 2149 /* 2150 * prreq frame format 2151 * [tlv] ssid 2152 * [tlv] supported rates 2153 * [tlv] extended supported rates 2154 */ 2155 ssid = rates = xrates = NULL; 2156 while (frm < efrm) { 2157 switch (*frm) { 2158 case IEEE80211_ELEMID_SSID: 2159 ssid = frm; 2160 break; 2161 case IEEE80211_ELEMID_RATES: 2162 rates = frm; 2163 break; 2164 case IEEE80211_ELEMID_XRATES: 2165 xrates = frm; 2166 break; 2167 } 2168 frm += frm[1] + 2; 2169 } 2170 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 2171 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); 2172 IEEE80211_VERIFY_SSID(ic->ic_bss, ssid); 2173 if ((ic->ic_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 2174 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 2175 wh, ieee80211_mgt_subtype_name[subtype >> 2176 IEEE80211_FC0_SUBTYPE_SHIFT], 2177 "%s", "no ssid with ssid suppression enabled"); 2178 ic->ic_stats.is_rx_ssidmismatch++; /*XXX*/ 2179 return; 2180 } 2181 2182 if (ni == ic->ic_bss) { 2183 if (ic->ic_opmode != IEEE80211_M_IBSS) 2184 ni = ieee80211_tmp_node(ic, wh->i_addr2); 2185 else if (IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) 2186 ; 2187 else { 2188 /* 2189 * XXX Cannot tell if the sender is operating 2190 * in ibss mode. But we need a new node to 2191 * send the response so blindly add them to the 2192 * neighbor table. 2193 */ 2194 ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta, 2195 wh->i_addr2); 2196 } 2197 if (ni == NULL) 2198 return; 2199 allocbs = 1; 2200 } else 2201 allocbs = 0; 2202 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2203 "[%s] recv probe req\n", ether_snprintf( 2204 ebuf, sizeof(ebuf), wh->i_addr2)); 2205 ni->ni_rssi = rssi; 2206 ni->ni_rstamp = rstamp; 2207 rate = ieee80211_setup_rates(ni, rates, xrates, 2208 IEEE80211_R_DOSORT | IEEE80211_R_DOFRATE 2209 | IEEE80211_R_DONEGO | IEEE80211_R_DODEL); 2210 if (rate & IEEE80211_RATE_BASIC) { 2211 IEEE80211_DISCARD(ic, IEEE80211_MSG_XRATE, 2212 wh, ieee80211_mgt_subtype_name[subtype >> 2213 IEEE80211_FC0_SUBTYPE_SHIFT], 2214 "%s", "recv'd rate set invalid"); 2215 } else { 2216 IEEE80211_SEND_MGMT(ic, ni, 2217 IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0); 2218 } 2219 if (allocbs && ic->ic_opmode != IEEE80211_M_IBSS) { 2220 /* reclaim immediately */ 2221 ieee80211_free_node(ni); 2222 } 2223 break; 2224 2225 case IEEE80211_FC0_SUBTYPE_AUTH: { 2226 u_int16_t algo, seq, status; 2227 /* 2228 * auth frame format 2229 * [2] algorithm 2230 * [2] sequence 2231 * [2] status 2232 * [tlv*] challenge 2233 */ 2234 IEEE80211_VERIFY_LENGTH(efrm - frm, 6); 2235 algo = le16toh(*(u_int16_t *)frm); 2236 seq = le16toh(*(u_int16_t *)(frm + 2)); 2237 status = le16toh(*(u_int16_t *)(frm + 4)); 2238 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 2239 "[%s] recv auth frame with algorithm %d seq %d\n", 2240 ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), algo, seq); 2241 /* 2242 * Consult the ACL policy module if setup. 2243 */ 2244 if (ic->ic_acl != NULL && 2245 !ic->ic_acl->iac_check(ic, wh->i_addr2)) { 2246 IEEE80211_DISCARD(ic, IEEE80211_MSG_ACL, 2247 wh, "auth", "%s", "disallowed by ACL"); 2248 ic->ic_stats.is_rx_acl++; 2249 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 2250 IEEE80211_SEND_MGMT(ic, ni, 2251 IEEE80211_FC0_SUBTYPE_AUTH, 2252 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 2253 } 2254 return; 2255 } 2256 if (ic->ic_flags & IEEE80211_F_COUNTERM) { 2257 IEEE80211_DISCARD(ic, 2258 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 2259 wh, "auth", "%s", "TKIP countermeasures enabled"); 2260 ic->ic_stats.is_rx_auth_countermeasures++; 2261 #ifndef IEEE80211_NO_HOSTAP 2262 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 2263 IEEE80211_SEND_MGMT(ic, ni, 2264 IEEE80211_FC0_SUBTYPE_AUTH, 2265 IEEE80211_REASON_MIC_FAILURE); 2266 } 2267 #endif /* !IEEE80211_NO_HOSTAP */ 2268 return; 2269 } 2270 if (algo == IEEE80211_AUTH_ALG_SHARED) 2271 ieee80211_auth_shared(ic, wh, frm + 6, efrm, ni, rssi, 2272 rstamp, seq, status); 2273 else if (algo == IEEE80211_AUTH_ALG_OPEN) 2274 ieee80211_auth_open(ic, wh, ni, rssi, rstamp, seq, 2275 status); 2276 else { 2277 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 2278 wh, "auth", "unsupported alg %d", algo); 2279 ic->ic_stats.is_rx_auth_unsupported++; 2280 #ifndef IEEE80211_NO_HOSTAP 2281 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 2282 /* XXX not right */ 2283 IEEE80211_SEND_MGMT(ic, ni, 2284 IEEE80211_FC0_SUBTYPE_AUTH, 2285 (seq+1) | (IEEE80211_STATUS_ALG<<16)); 2286 } 2287 #endif /* !IEEE80211_NO_HOSTAP */ 2288 return; 2289 } 2290 break; 2291 } 2292 2293 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2294 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 2295 u_int16_t capinfo, lintval; 2296 struct ieee80211_rsnparms rsn; 2297 u_int8_t reason; 2298 2299 if (ic->ic_opmode != IEEE80211_M_HOSTAP || 2300 ic->ic_state != IEEE80211_S_RUN) { 2301 ic->ic_stats.is_rx_mgtdiscard++; 2302 return; 2303 } 2304 2305 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2306 reassoc = 1; 2307 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 2308 } else { 2309 reassoc = 0; 2310 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 2311 } 2312 /* 2313 * asreq frame format 2314 * [2] capability information 2315 * [2] listen interval 2316 * [6*] current AP address (reassoc only) 2317 * [tlv] ssid 2318 * [tlv] supported rates 2319 * [tlv] extended supported rates 2320 * [tlv] WPA or RSN 2321 */ 2322 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4)); 2323 if (!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid)) { 2324 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 2325 wh, ieee80211_mgt_subtype_name[subtype >> 2326 IEEE80211_FC0_SUBTYPE_SHIFT], 2327 "%s", "wrong bssid"); 2328 ic->ic_stats.is_rx_assoc_bss++; 2329 return; 2330 } 2331 capinfo = le16toh(*(u_int16_t *)frm); frm += 2; 2332 lintval = le16toh(*(u_int16_t *)frm); frm += 2; 2333 if (reassoc) 2334 frm += 6; /* ignore current AP info */ 2335 ssid = rates = xrates = wpa = wme = NULL; 2336 while (frm < efrm) { 2337 switch (*frm) { 2338 case IEEE80211_ELEMID_SSID: 2339 ssid = frm; 2340 break; 2341 case IEEE80211_ELEMID_RATES: 2342 rates = frm; 2343 break; 2344 case IEEE80211_ELEMID_XRATES: 2345 xrates = frm; 2346 break; 2347 /* XXX verify only one of RSN and WPA ie's? */ 2348 case IEEE80211_ELEMID_RSN: 2349 wpa = frm; 2350 break; 2351 case IEEE80211_ELEMID_VENDOR: 2352 if (iswpaoui(frm)) 2353 wpa = frm; 2354 else if (iswmeinfo(frm)) 2355 wme = frm; 2356 /* XXX Atheros OUI support */ 2357 break; 2358 } 2359 frm += frm[1] + 2; 2360 } 2361 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 2362 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); 2363 IEEE80211_VERIFY_SSID(ic->ic_bss, ssid); 2364 2365 if (ni == ic->ic_bss) { 2366 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 2367 "[%s] deny %s request, sta not authenticated\n", 2368 ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), 2369 reassoc ? "reassoc" : "assoc"); 2370 ieee80211_send_error(ic, ni, wh->i_addr2, 2371 IEEE80211_FC0_SUBTYPE_DEAUTH, 2372 IEEE80211_REASON_ASSOC_NOT_AUTHED); 2373 ic->ic_stats.is_rx_assoc_notauth++; 2374 return; 2375 } 2376 /* assert right associstion security credentials */ 2377 if (wpa == NULL && (ic->ic_flags & IEEE80211_F_WPA)) { 2378 IEEE80211_DPRINTF(ic, 2379 IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 2380 "[%s] no WPA/RSN IE in association request\n", 2381 ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2)); 2382 IEEE80211_SEND_MGMT(ic, ni, 2383 IEEE80211_FC0_SUBTYPE_DEAUTH, 2384 IEEE80211_REASON_RSN_REQUIRED); 2385 ieee80211_node_leave(ic, ni); 2386 /* XXX distinguish WPA/RSN? */ 2387 ic->ic_stats.is_rx_assoc_badwpaie++; 2388 return; 2389 } 2390 if (wpa != NULL) { 2391 /* 2392 * Parse WPA information element. Note that 2393 * we initialize the param block from the node 2394 * state so that information in the IE overrides 2395 * our defaults. The resulting parameters are 2396 * installed below after the association is assured. 2397 */ 2398 rsn = ni->ni_rsn; 2399 if (wpa[0] != IEEE80211_ELEMID_RSN) 2400 reason = ieee80211_parse_wpa(ic, wpa, &rsn, wh); 2401 else 2402 reason = ieee80211_parse_rsn(ic, wpa, &rsn, wh); 2403 if (reason != 0) { 2404 IEEE80211_SEND_MGMT(ic, ni, 2405 IEEE80211_FC0_SUBTYPE_DEAUTH, reason); 2406 ieee80211_node_leave(ic, ni); 2407 /* XXX distinguish WPA/RSN? */ 2408 ic->ic_stats.is_rx_assoc_badwpaie++; 2409 return; 2410 } 2411 IEEE80211_DPRINTF(ic, 2412 IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 2413 "[%s] %s ie: mc %u/%u uc %u/%u key %u caps 0x%x\n", 2414 ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), 2415 wpa[0] != IEEE80211_ELEMID_RSN ? "WPA" : "RSN", 2416 rsn.rsn_mcastcipher, rsn.rsn_mcastkeylen, 2417 rsn.rsn_ucastcipher, rsn.rsn_ucastkeylen, 2418 rsn.rsn_keymgmt, rsn.rsn_caps); 2419 } 2420 /* discard challenge after association */ 2421 if (ni->ni_challenge != NULL) { 2422 free(ni->ni_challenge, M_DEVBUF); 2423 ni->ni_challenge = NULL; 2424 } 2425 /* NB: 802.11 spec says to ignore station's privacy bit */ 2426 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2427 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 2428 "[%s] deny %s request, capability mismatch 0x%x\n", 2429 ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), 2430 reassoc ? "reassoc" : "assoc", capinfo); 2431 IEEE80211_SEND_MGMT(ic, ni, resp, 2432 IEEE80211_STATUS_CAPINFO); 2433 ieee80211_node_leave(ic, ni); 2434 ic->ic_stats.is_rx_assoc_capmismatch++; 2435 return; 2436 } 2437 rate = ieee80211_setup_rates(ni, rates, xrates, 2438 IEEE80211_R_DOSORT | IEEE80211_R_DOFRATE | 2439 IEEE80211_R_DONEGO | IEEE80211_R_DODEL); 2440 /* 2441 * If constrained to 11g-only stations reject an 2442 * 11b-only station. We cheat a bit here by looking 2443 * at the max negotiated xmit rate and assuming anyone 2444 * with a best rate <24Mb/s is an 11b station. 2445 */ 2446 if ((rate & IEEE80211_RATE_BASIC) || 2447 ((ic->ic_flags & IEEE80211_F_PUREG) && rate < 48)) { 2448 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 2449 "[%s] deny %s request, rate set mismatch\n", 2450 ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), 2451 reassoc ? "reassoc" : "assoc"); 2452 IEEE80211_SEND_MGMT(ic, ni, resp, 2453 IEEE80211_STATUS_BASIC_RATE); 2454 ieee80211_node_leave(ic, ni); 2455 ic->ic_stats.is_rx_assoc_norate++; 2456 return; 2457 } 2458 ni->ni_rssi = rssi; 2459 ni->ni_rstamp = rstamp; 2460 ni->ni_intval = lintval; 2461 ni->ni_capinfo = capinfo; 2462 ni->ni_chan = ic->ic_bss->ni_chan; 2463 ni->ni_fhdwell = ic->ic_bss->ni_fhdwell; 2464 ni->ni_fhindex = ic->ic_bss->ni_fhindex; 2465 if (wpa != NULL) { 2466 /* 2467 * Record WPA/RSN parameters for station, mark 2468 * node as using WPA and record information element 2469 * for applications that require it. 2470 */ 2471 ni->ni_rsn = rsn; 2472 ieee80211_saveie(&ni->ni_wpa_ie, wpa); 2473 } else if (ni->ni_wpa_ie != NULL) { 2474 /* 2475 * Flush any state from a previous association. 2476 */ 2477 free(ni->ni_wpa_ie, M_DEVBUF); 2478 ni->ni_wpa_ie = NULL; 2479 } 2480 if (wme != NULL) { 2481 /* 2482 * Record WME parameters for station, mark node 2483 * as capable of QoS and record information 2484 * element for applications that require it. 2485 */ 2486 ieee80211_saveie(&ni->ni_wme_ie, wme); 2487 ni->ni_flags |= IEEE80211_NODE_QOS; 2488 } else if (ni->ni_wme_ie != NULL) { 2489 /* 2490 * Flush any state from a previous association. 2491 */ 2492 free(ni->ni_wme_ie, M_DEVBUF); 2493 ni->ni_wme_ie = NULL; 2494 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2495 } 2496 ieee80211_node_join(ic, ni, resp); 2497 break; 2498 } 2499 2500 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2501 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 2502 u_int16_t capinfo, associd; 2503 u_int16_t status; 2504 2505 if (ic->ic_opmode != IEEE80211_M_STA || 2506 ic->ic_state != IEEE80211_S_ASSOC) { 2507 ic->ic_stats.is_rx_mgtdiscard++; 2508 return; 2509 } 2510 2511 /* 2512 * asresp frame format 2513 * [2] capability information 2514 * [2] status 2515 * [2] association ID 2516 * [tlv] supported rates 2517 * [tlv] extended supported rates 2518 * [tlv] WME 2519 */ 2520 IEEE80211_VERIFY_LENGTH(efrm - frm, 6); 2521 ni = ic->ic_bss; 2522 capinfo = le16toh(*(u_int16_t *)frm); 2523 frm += 2; 2524 status = le16toh(*(u_int16_t *)frm); 2525 frm += 2; 2526 if (status != 0) { 2527 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2528 "[%s] %sassoc failed (reason %d)\n", 2529 ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), 2530 ISREASSOC(subtype) ? "re" : "", status); 2531 if (ni != ic->ic_bss) /* XXX never true? */ 2532 ni->ni_fails++; 2533 ic->ic_stats.is_rx_auth_fail++; /* XXX */ 2534 return; 2535 } 2536 associd = le16toh(*(u_int16_t *)frm); 2537 frm += 2; 2538 2539 rates = xrates = wpa = wme = NULL; 2540 while (frm < efrm) { 2541 switch (*frm) { 2542 case IEEE80211_ELEMID_RATES: 2543 rates = frm; 2544 break; 2545 case IEEE80211_ELEMID_XRATES: 2546 xrates = frm; 2547 break; 2548 case IEEE80211_ELEMID_VENDOR: 2549 if (iswmeoui(frm)) 2550 wme = frm; 2551 /* XXX Atheros OUI support */ 2552 break; 2553 } 2554 frm += frm[1] + 2; 2555 } 2556 2557 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 2558 rate = ieee80211_setup_rates(ni, rates, xrates, 2559 IEEE80211_R_DOSORT | IEEE80211_R_DOFRATE | 2560 IEEE80211_R_DONEGO | IEEE80211_R_DODEL); 2561 if (rate & IEEE80211_RATE_BASIC) { 2562 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2563 "[%s] %sassoc failed (rate set mismatch)\n", 2564 ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), 2565 ISREASSOC(subtype) ? "re" : ""); 2566 if (ni != ic->ic_bss) /* XXX never true? */ 2567 ni->ni_fails++; 2568 ic->ic_stats.is_rx_assoc_norate++; 2569 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 2570 return; 2571 } 2572 2573 ni->ni_capinfo = capinfo; 2574 ni->ni_associd = associd; 2575 if (wme != NULL && 2576 ieee80211_parse_wmeparams(ic, wme, wh) >= 0) { 2577 ni->ni_flags |= IEEE80211_NODE_QOS; 2578 ieee80211_wme_updateparams(ic); 2579 } else 2580 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2581 /* 2582 * Configure state now that we are associated. 2583 * 2584 * XXX may need different/additional driver callbacks? 2585 */ 2586 if (ic->ic_curmode == IEEE80211_MODE_11A || 2587 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 2588 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 2589 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 2590 } else { 2591 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 2592 ic->ic_flags |= IEEE80211_F_USEBARKER; 2593 } 2594 ieee80211_set_shortslottime(ic, 2595 ic->ic_curmode == IEEE80211_MODE_11A || 2596 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 2597 /* 2598 * Honor ERP protection. 2599 * 2600 * NB: ni_erp should zero for non-11g operation. 2601 * XXX check ic_curmode anyway? 2602 */ 2603 if (ic->ic_curmode == IEEE80211_MODE_11G && 2604 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 2605 ic->ic_flags |= IEEE80211_F_USEPROT; 2606 else 2607 ic->ic_flags &= ~IEEE80211_F_USEPROT; 2608 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2609 "[%s] %sassoc success: %s preamble, %s slot time%s%s\n", 2610 ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), 2611 ISREASSOC(subtype) ? "re" : "", 2612 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 2613 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 2614 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 2615 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "" 2616 ); 2617 ieee80211_new_state(ic, IEEE80211_S_RUN, subtype); 2618 break; 2619 } 2620 2621 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 2622 u_int16_t reason; 2623 2624 if (ic->ic_state == IEEE80211_S_SCAN) { 2625 ic->ic_stats.is_rx_mgtdiscard++; 2626 return; 2627 } 2628 /* 2629 * deauth frame format 2630 * [2] reason 2631 */ 2632 IEEE80211_VERIFY_LENGTH(efrm - frm, 2); 2633 reason = le16toh(*(u_int16_t *)frm); 2634 __USE(reason); 2635 ic->ic_stats.is_rx_deauth++; 2636 IEEE80211_NODE_STAT(ni, rx_deauth); 2637 2638 if (!IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_myaddr)) { 2639 /* Not intended for this station. */ 2640 ic->ic_stats.is_rx_mgtdiscard++; 2641 break; 2642 } 2643 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 2644 "[%s] recv deauthenticate (reason %d)\n", 2645 ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), reason); 2646 switch (ic->ic_opmode) { 2647 case IEEE80211_M_STA: 2648 ieee80211_new_state(ic, IEEE80211_S_AUTH, 2649 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 2650 break; 2651 case IEEE80211_M_HOSTAP: 2652 #ifndef IEEE80211_NO_HOSTAP 2653 if (ni != ic->ic_bss) 2654 ieee80211_node_leave(ic, ni); 2655 #endif /* !IEEE80211_NO_HOSTAP */ 2656 break; 2657 default: 2658 ic->ic_stats.is_rx_mgtdiscard++; 2659 break; 2660 } 2661 break; 2662 } 2663 2664 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2665 u_int16_t reason; 2666 2667 if (ic->ic_state != IEEE80211_S_RUN && 2668 ic->ic_state != IEEE80211_S_ASSOC && 2669 ic->ic_state != IEEE80211_S_AUTH) { 2670 ic->ic_stats.is_rx_mgtdiscard++; 2671 return; 2672 } 2673 /* 2674 * disassoc frame format 2675 * [2] reason 2676 */ 2677 IEEE80211_VERIFY_LENGTH(efrm - frm, 2); 2678 reason = le16toh(*(u_int16_t *)frm); 2679 __USE(reason); 2680 ic->ic_stats.is_rx_disassoc++; 2681 IEEE80211_NODE_STAT(ni, rx_disassoc); 2682 2683 if (!IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_myaddr)) { 2684 /* Not intended for this station. */ 2685 ic->ic_stats.is_rx_mgtdiscard++; 2686 break; 2687 } 2688 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2689 "[%s] recv disassociate (reason %d)\n", 2690 ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), reason); 2691 switch (ic->ic_opmode) { 2692 case IEEE80211_M_STA: 2693 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 2694 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 2695 break; 2696 case IEEE80211_M_HOSTAP: 2697 #ifndef IEEE80211_NO_HOSTAP 2698 if (ni != ic->ic_bss) 2699 ieee80211_node_leave(ic, ni); 2700 #endif /* !IEEE80211_NO_HOSTAP */ 2701 break; 2702 default: 2703 ic->ic_stats.is_rx_mgtdiscard++; 2704 break; 2705 } 2706 break; 2707 } 2708 default: 2709 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 2710 wh, "mgt", "subtype 0x%x not handled", subtype); 2711 ic->ic_stats.is_rx_badsubtype++; 2712 break; 2713 } 2714 #undef ISREASSOC 2715 #undef ISPROBE 2716 } 2717 #undef IEEE80211_VERIFY_LENGTH 2718 #undef IEEE80211_VERIFY_ELEMENT 2719 2720 #ifndef IEEE80211_NO_HOSTAP 2721 /* 2722 * Handle station power-save state change. 2723 */ 2724 static void 2725 ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable) 2726 { 2727 struct ieee80211com *ic = ni->ni_ic; 2728 struct mbuf *m; 2729 IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); 2730 2731 if (enable) { 2732 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) 2733 ic->ic_ps_sta++; 2734 ni->ni_flags |= IEEE80211_NODE_PWR_MGT; 2735 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 2736 "[%s] power save mode on, %u sta's in ps mode\n", 2737 ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), 2738 ic->ic_ps_sta); 2739 return; 2740 } 2741 2742 if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) 2743 ic->ic_ps_sta--; 2744 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT; 2745 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 2746 "[%s] power save mode off, %u sta's in ps mode\n", 2747 ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), ic->ic_ps_sta); 2748 /* XXX if no stations in ps mode, flush mc frames */ 2749 2750 /* 2751 * Flush queued unicast frames. 2752 */ 2753 if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) { 2754 if (ic->ic_set_tim != NULL) 2755 ic->ic_set_tim(ni, 0); /* just in case */ 2756 return; 2757 } 2758 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 2759 "[%s] flush ps queue, %u packets queued\n", 2760 ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), 2761 IEEE80211_NODE_SAVEQ_QLEN(ni)); 2762 for (;;) { 2763 int qlen; 2764 2765 IEEE80211_NODE_SAVEQ_DEQUEUE(ni, m, qlen); 2766 if (m == NULL) 2767 break; 2768 /* 2769 * If this is the last packet, turn off the TIM bit. 2770 * If there are more packets, set the more packets bit 2771 * in the mbuf so ieee80211_encap will mark the 802.11 2772 * head to indicate more data frames will follow. 2773 */ 2774 if (qlen != 0) 2775 m->m_flags |= M_MORE_DATA; 2776 /* XXX need different driver interface */ 2777 /* XXX bypasses q max */ 2778 IF_ENQUEUE(&ic->ic_ifp->if_snd, m); 2779 } 2780 if (ic->ic_set_tim != NULL) 2781 ic->ic_set_tim(ni, 0); 2782 } 2783 2784 /* 2785 * Process a received ps-poll frame. 2786 */ 2787 static void 2788 ieee80211_recv_pspoll(struct ieee80211com *ic, 2789 struct ieee80211_node *ni, struct mbuf *m0) 2790 { 2791 struct ieee80211_frame_min *wh; 2792 struct mbuf *m; 2793 u_int16_t aid; 2794 int qlen; 2795 IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); 2796 2797 wh = mtod(m0, struct ieee80211_frame_min *); 2798 if (ni->ni_associd == 0) { 2799 IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2800 (struct ieee80211_frame *) wh, "ps-poll", 2801 "%s", "unassociated station"); 2802 ic->ic_stats.is_ps_unassoc++; 2803 IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2804 IEEE80211_REASON_NOT_ASSOCED); 2805 return; 2806 } 2807 2808 aid = le16toh(*(u_int16_t *)wh->i_dur); 2809 if (aid != ni->ni_associd) { 2810 IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2811 (struct ieee80211_frame *) wh, "ps-poll", 2812 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2813 ni->ni_associd, aid); 2814 ic->ic_stats.is_ps_badaid++; 2815 IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2816 IEEE80211_REASON_NOT_ASSOCED); 2817 return; 2818 } 2819 2820 /* Okay, take the first queued packet and put it out... */ 2821 IEEE80211_NODE_SAVEQ_DEQUEUE(ni, m, qlen); 2822 if (m == NULL) { 2823 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 2824 "[%s] recv ps-poll, but queue empty\n", 2825 ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2)); 2826 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2827 ic->ic_stats.is_ps_qempty++; /* XXX node stat */ 2828 if (ic->ic_set_tim != NULL) 2829 ic->ic_set_tim(ni, 0); /* just in case */ 2830 return; 2831 } 2832 /* 2833 * If there are more packets, set the more packets bit 2834 * in the packet dispatched to the station; otherwise 2835 * turn off the TIM bit. 2836 */ 2837 if (qlen != 0) { 2838 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 2839 "[%s] recv ps-poll, send packet, %u still queued\n", 2840 ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), qlen); 2841 m->m_flags |= M_MORE_DATA; 2842 } else { 2843 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 2844 "[%s] recv ps-poll, send packet, queue empty\n", 2845 ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr)); 2846 if (ic->ic_set_tim != NULL) 2847 ic->ic_set_tim(ni, 0); 2848 } 2849 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2850 IF_ENQUEUE(&ic->ic_ifp->if_snd, m); 2851 } 2852 #endif /* !IEEE80211_NO_HOSTAP */ 2853 2854 #ifdef IEEE80211_DEBUG 2855 /* 2856 * Debugging support. 2857 */ 2858 2859 /* 2860 * Return the bssid of a frame. 2861 */ 2862 static const u_int8_t * 2863 ieee80211_getbssid(struct ieee80211com *ic, const struct ieee80211_frame *wh) 2864 { 2865 if (ic->ic_opmode == IEEE80211_M_STA) 2866 return wh->i_addr2; 2867 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 2868 return wh->i_addr1; 2869 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 2870 return wh->i_addr1; 2871 return wh->i_addr3; 2872 } 2873 2874 void 2875 ieee80211_note(struct ieee80211com *ic, const char *fmt, ...) 2876 { 2877 char buf[128]; /* XXX */ 2878 va_list ap; 2879 2880 va_start(ap, fmt); 2881 vsnprintf(buf, sizeof(buf), fmt, ap); 2882 va_end(ap); 2883 2884 if_printf(ic->ic_ifp, "%s", buf); /* NB: no \n */ 2885 } 2886 2887 void 2888 ieee80211_note_frame(struct ieee80211com *ic, 2889 const struct ieee80211_frame *wh, 2890 const char *fmt, ...) 2891 { 2892 char buf[128]; /* XXX */ 2893 va_list ap; 2894 char ebuf[3 * ETHER_ADDR_LEN]; 2895 2896 va_start(ap, fmt); 2897 vsnprintf(buf, sizeof(buf), fmt, ap); 2898 va_end(ap); 2899 if_printf(ic->ic_ifp, "[%s] %s\n", 2900 ether_snprintf(ebuf, sizeof(ebuf), 2901 ieee80211_getbssid(ic, wh)), buf); 2902 } 2903 2904 void 2905 ieee80211_note_mac(struct ieee80211com *ic, 2906 const u_int8_t mac[IEEE80211_ADDR_LEN], 2907 const char *fmt, ...) 2908 { 2909 char buf[128]; /* XXX */ 2910 va_list ap; 2911 char ebuf[3 * ETHER_ADDR_LEN]; 2912 2913 va_start(ap, fmt); 2914 vsnprintf(buf, sizeof(buf), fmt, ap); 2915 va_end(ap); 2916 if_printf(ic->ic_ifp, "[%s] %s\n", ether_snprintf(ebuf, sizeof(ebuf), 2917 mac), buf); 2918 } 2919 2920 static void 2921 ieee80211_discard_frame(struct ieee80211com *ic, 2922 const struct ieee80211_frame *wh, 2923 const char *type, const char *fmt, ...) 2924 { 2925 va_list ap; 2926 char ebuf[3 * ETHER_ADDR_LEN]; 2927 2928 printf("[%s:%s] discard ", ic->ic_ifp->if_xname, 2929 ether_snprintf(ebuf, sizeof(ebuf), ieee80211_getbssid(ic, wh))); 2930 if (type != NULL) 2931 printf("%s frame, ", type); 2932 else 2933 printf("frame, "); 2934 va_start(ap, fmt); 2935 vprintf(fmt, ap); 2936 va_end(ap); 2937 printf("\n"); 2938 } 2939 2940 static void 2941 ieee80211_discard_ie(struct ieee80211com *ic, 2942 const struct ieee80211_frame *wh, 2943 const char *type, const char *fmt, ...) 2944 { 2945 va_list ap; 2946 char ebuf[3 * ETHER_ADDR_LEN]; 2947 2948 printf("[%s:%s] discard ", ic->ic_ifp->if_xname, 2949 ether_snprintf(ebuf, sizeof(ebuf), ieee80211_getbssid(ic, wh))); 2950 if (type != NULL) 2951 printf("%s information element, ", type); 2952 else 2953 printf("information element, "); 2954 va_start(ap, fmt); 2955 vprintf(fmt, ap); 2956 va_end(ap); 2957 printf("\n"); 2958 } 2959 2960 static void 2961 ieee80211_discard_mac(struct ieee80211com *ic, 2962 const u_int8_t mac[IEEE80211_ADDR_LEN], 2963 const char *type, const char *fmt, ...) 2964 { 2965 va_list ap; 2966 char ebuf[3 * ETHER_ADDR_LEN]; 2967 2968 printf("[%s:%s] discard ", ic->ic_ifp->if_xname, 2969 ether_snprintf(ebuf, sizeof(ebuf), mac)); 2970 if (type != NULL) 2971 printf("%s frame, ", type); 2972 else 2973 printf("frame, "); 2974 va_start(ap, fmt); 2975 vprintf(fmt, ap); 2976 va_end(ap); 2977 printf("\n"); 2978 } 2979 #endif /* IEEE80211_DEBUG */ 2980