1 /*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2005 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 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * Alternatively, this software may be distributed under the terms of the 18 * GNU General Public License ("GPL") version 2 as published by the Free 19 * Software Foundation. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/mbuf.h> 39 #include <sys/malloc.h> 40 #include <sys/endian.h> 41 #include <sys/kernel.h> 42 43 #include <sys/socket.h> 44 45 #include <net/if.h> 46 #include <net/if_media.h> 47 #include <net/ethernet.h> 48 #include <net/if_llc.h> 49 #include <net/if_vlan_var.h> 50 51 #include <net80211/ieee80211_var.h> 52 53 #include <net/bpf.h> 54 55 #ifdef IEEE80211_DEBUG 56 #include <machine/stdarg.h> 57 58 /* 59 * Decide if a received management frame should be 60 * printed when debugging is enabled. This filters some 61 * of the less interesting frames that come frequently 62 * (e.g. beacons). 63 */ 64 static __inline int 65 doprint(struct ieee80211com *ic, int subtype) 66 { 67 switch (subtype) { 68 case IEEE80211_FC0_SUBTYPE_BEACON: 69 return (ic->ic_flags & IEEE80211_F_SCAN); 70 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 71 return (ic->ic_opmode == IEEE80211_M_IBSS); 72 } 73 return 1; 74 } 75 76 /* 77 * Emit a debug message about discarding a frame or information 78 * element. One format is for extracting the mac address from 79 * the frame header; the other is for when a header is not 80 * available or otherwise appropriate. 81 */ 82 #define IEEE80211_DISCARD(_ic, _m, _wh, _type, _fmt, ...) do { \ 83 if ((_ic)->ic_debug & (_m)) \ 84 ieee80211_discard_frame(_ic, _wh, _type, _fmt, __VA_ARGS__);\ 85 } while (0) 86 #define IEEE80211_DISCARD_IE(_ic, _m, _wh, _type, _fmt, ...) do { \ 87 if ((_ic)->ic_debug & (_m)) \ 88 ieee80211_discard_ie(_ic, _wh, _type, _fmt, __VA_ARGS__);\ 89 } while (0) 90 #define IEEE80211_DISCARD_MAC(_ic, _m, _mac, _type, _fmt, ...) do { \ 91 if ((_ic)->ic_debug & (_m)) \ 92 ieee80211_discard_mac(_ic, _mac, _type, _fmt, __VA_ARGS__);\ 93 } while (0) 94 95 static const u_int8_t *ieee80211_getbssid(struct ieee80211com *, 96 const struct ieee80211_frame *); 97 static void ieee80211_discard_frame(struct ieee80211com *, 98 const struct ieee80211_frame *, const char *type, const char *fmt, ...); 99 static void ieee80211_discard_ie(struct ieee80211com *, 100 const struct ieee80211_frame *, const char *type, const char *fmt, ...); 101 static void ieee80211_discard_mac(struct ieee80211com *, 102 const u_int8_t mac[IEEE80211_ADDR_LEN], const char *type, 103 const char *fmt, ...); 104 #else 105 #define IEEE80211_DISCARD(_ic, _m, _wh, _type, _fmt, ...) 106 #define IEEE80211_DISCARD_IE(_ic, _m, _wh, _type, _fmt, ...) 107 #define IEEE80211_DISCARD_MAC(_ic, _m, _mac, _type, _fmt, ...) 108 #endif /* IEEE80211_DEBUG */ 109 110 static struct mbuf *ieee80211_defrag(struct ieee80211com *, 111 struct ieee80211_node *, struct mbuf *, int); 112 static struct mbuf *ieee80211_decap(struct ieee80211com *, struct mbuf *, int); 113 static void ieee80211_send_error(struct ieee80211com *, struct ieee80211_node *, 114 const u_int8_t *mac, int subtype, int arg); 115 static void ieee80211_deliver_data(struct ieee80211com *, 116 struct ieee80211_node *, struct mbuf *); 117 static void ieee80211_node_pwrsave(struct ieee80211_node *, int enable); 118 static void ieee80211_recv_pspoll(struct ieee80211com *, 119 struct ieee80211_node *, struct mbuf *); 120 121 /* 122 * Process a received frame. The node associated with the sender 123 * should be supplied. If nothing was found in the node table then 124 * the caller is assumed to supply a reference to ic_bss instead. 125 * The RSSI and a timestamp are also supplied. The RSSI data is used 126 * during AP scanning to select a AP to associate with; it can have 127 * any units so long as values have consistent units and higher values 128 * mean ``better signal''. The receive timestamp is currently not used 129 * by the 802.11 layer. 130 */ 131 int 132 ieee80211_input(struct ieee80211com *ic, struct mbuf *m, 133 struct ieee80211_node *ni, int rssi, u_int32_t rstamp) 134 { 135 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 136 #define HAS_SEQ(type) ((type & 0x4) == 0) 137 struct ifnet *ifp = ic->ic_ifp; 138 struct ieee80211_frame *wh; 139 struct ieee80211_key *key; 140 struct ether_header *eh; 141 int hdrspace; 142 u_int8_t dir, type, subtype; 143 u_int8_t *bssid; 144 u_int16_t rxseq; 145 146 KASSERT(ni != NULL, ("null node")); 147 ni->ni_inact = ni->ni_inact_reload; 148 149 /* trim CRC here so WEP can find its own CRC at the end of packet. */ 150 if (m->m_flags & M_HASFCS) { 151 m_adj(m, -IEEE80211_CRC_LEN); 152 m->m_flags &= ~M_HASFCS; 153 } 154 type = -1; /* undefined */ 155 /* 156 * In monitor mode, send everything directly to bpf. 157 * XXX may want to include the CRC 158 */ 159 if (ic->ic_opmode == IEEE80211_M_MONITOR) 160 goto out; 161 162 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 163 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 164 ni->ni_macaddr, NULL, 165 "too short (1): len %u", m->m_pkthdr.len); 166 ic->ic_stats.is_rx_tooshort++; 167 goto out; 168 } 169 /* 170 * Bit of a cheat here, we use a pointer for a 3-address 171 * frame format but don't reference fields past outside 172 * ieee80211_frame_min w/o first validating the data is 173 * present. 174 */ 175 wh = mtod(m, struct ieee80211_frame *); 176 177 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 178 IEEE80211_FC0_VERSION_0) { 179 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 180 ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]); 181 ic->ic_stats.is_rx_badversion++; 182 goto err; 183 } 184 185 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 186 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 187 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 188 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 189 switch (ic->ic_opmode) { 190 case IEEE80211_M_STA: 191 bssid = wh->i_addr2; 192 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 193 /* not interested in */ 194 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 195 bssid, NULL, "%s", "not to bss"); 196 ic->ic_stats.is_rx_wrongbss++; 197 goto out; 198 } 199 break; 200 case IEEE80211_M_IBSS: 201 case IEEE80211_M_AHDEMO: 202 case IEEE80211_M_HOSTAP: 203 if (dir != IEEE80211_FC1_DIR_NODS) 204 bssid = wh->i_addr1; 205 else if (type == IEEE80211_FC0_TYPE_CTL) 206 bssid = wh->i_addr1; 207 else { 208 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 209 IEEE80211_DISCARD_MAC(ic, 210 IEEE80211_MSG_ANY, ni->ni_macaddr, 211 NULL, "too short (2): len %u", 212 m->m_pkthdr.len); 213 ic->ic_stats.is_rx_tooshort++; 214 goto out; 215 } 216 bssid = wh->i_addr3; 217 } 218 if (type != IEEE80211_FC0_TYPE_DATA) 219 break; 220 /* 221 * Data frame, validate the bssid. 222 */ 223 if (!IEEE80211_ADDR_EQ(bssid, ic->ic_bss->ni_bssid) && 224 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 225 /* not interested in */ 226 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 227 bssid, NULL, "%s", "not to bss"); 228 ic->ic_stats.is_rx_wrongbss++; 229 goto out; 230 } 231 /* 232 * For adhoc mode we cons up a node when it doesn't 233 * exist. This should probably done after an ACL check. 234 */ 235 if (ni == ic->ic_bss && 236 ic->ic_opmode != IEEE80211_M_HOSTAP && 237 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 238 /* 239 * Fake up a node for this newly 240 * discovered member of the IBSS. 241 */ 242 ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta, 243 wh->i_addr2); 244 if (ni == NULL) { 245 /* NB: stat kept for alloc failure */ 246 goto err; 247 } 248 } 249 break; 250 default: 251 goto out; 252 } 253 ni->ni_rssi = rssi; 254 ni->ni_rstamp = rstamp; 255 if (HAS_SEQ(type)) { 256 u_int8_t tid; 257 if (IEEE80211_QOS_HAS_SEQ(wh)) { 258 tid = ((struct ieee80211_qosframe *)wh)-> 259 i_qos[0] & IEEE80211_QOS_TID; 260 if (TID_TO_WME_AC(tid) >= WME_AC_VI) 261 ic->ic_wme.wme_hipri_traffic++; 262 tid++; 263 } else 264 tid = 0; 265 rxseq = le16toh(*(u_int16_t *)wh->i_seq); 266 if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) && 267 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 268 /* duplicate, discard */ 269 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 270 bssid, "duplicate", 271 "seqno <%u,%u> fragno <%u,%u> tid %u", 272 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 273 ni->ni_rxseqs[tid] >> 274 IEEE80211_SEQ_SEQ_SHIFT, 275 rxseq & IEEE80211_SEQ_FRAG_MASK, 276 ni->ni_rxseqs[tid] & 277 IEEE80211_SEQ_FRAG_MASK, 278 tid); 279 ic->ic_stats.is_rx_dup++; 280 IEEE80211_NODE_STAT(ni, rx_dup); 281 goto out; 282 } 283 ni->ni_rxseqs[tid] = rxseq; 284 } 285 } 286 287 switch (type) { 288 case IEEE80211_FC0_TYPE_DATA: 289 hdrspace = ieee80211_hdrspace(ic, wh); 290 if (m->m_len < hdrspace && 291 (m = m_pullup(m, hdrspace)) == NULL) { 292 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 293 ni->ni_macaddr, NULL, 294 "data too short: expecting %u", hdrspace); 295 ic->ic_stats.is_rx_tooshort++; 296 goto out; /* XXX */ 297 } 298 switch (ic->ic_opmode) { 299 case IEEE80211_M_STA: 300 if (dir != IEEE80211_FC1_DIR_FROMDS) { 301 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 302 wh, "data", "%s", "unknown dir 0x%x", dir); 303 ic->ic_stats.is_rx_wrongdir++; 304 goto out; 305 } 306 if ((ifp->if_flags & IFF_SIMPLEX) && 307 IEEE80211_IS_MULTICAST(wh->i_addr1) && 308 IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_myaddr)) { 309 /* 310 * In IEEE802.11 network, multicast packet 311 * sent from me is broadcasted from AP. 312 * It should be silently discarded for 313 * SIMPLEX interface. 314 */ 315 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 316 wh, NULL, "%s", "multicast echo"); 317 ic->ic_stats.is_rx_mcastecho++; 318 goto out; 319 } 320 break; 321 case IEEE80211_M_IBSS: 322 case IEEE80211_M_AHDEMO: 323 if (dir != IEEE80211_FC1_DIR_NODS) { 324 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 325 wh, "data", "%s", "unknown dir 0x%x", dir); 326 ic->ic_stats.is_rx_wrongdir++; 327 goto out; 328 } 329 /* XXX no power-save support */ 330 break; 331 case IEEE80211_M_HOSTAP: 332 if (dir != IEEE80211_FC1_DIR_TODS) { 333 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 334 wh, "data", "%s", "unknown dir 0x%x", dir); 335 ic->ic_stats.is_rx_wrongdir++; 336 goto out; 337 } 338 /* check if source STA is associated */ 339 if (ni == ic->ic_bss) { 340 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 341 wh, "data", "%s", "unknown src"); 342 ieee80211_send_error(ic, ni, wh->i_addr2, 343 IEEE80211_FC0_SUBTYPE_DEAUTH, 344 IEEE80211_REASON_NOT_AUTHED); 345 ic->ic_stats.is_rx_notassoc++; 346 goto err; 347 } 348 if (ni->ni_associd == 0) { 349 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 350 wh, "data", "%s", "unassoc src"); 351 IEEE80211_SEND_MGMT(ic, ni, 352 IEEE80211_FC0_SUBTYPE_DISASSOC, 353 IEEE80211_REASON_NOT_ASSOCED); 354 ic->ic_stats.is_rx_notassoc++; 355 goto err; 356 } 357 358 /* 359 * Check for power save state change. 360 */ 361 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 362 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 363 ieee80211_node_pwrsave(ni, 364 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 365 break; 366 default: 367 /* XXX here to keep compiler happy */ 368 goto out; 369 } 370 371 /* 372 * Handle privacy requirements. Note that we 373 * must not be preempted from here until after 374 * we (potentially) call ieee80211_crypto_demic; 375 * otherwise we may violate assumptions in the 376 * crypto cipher modules used to do delayed update 377 * of replay sequence numbers. 378 */ 379 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 380 if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { 381 /* 382 * Discard encrypted frames when privacy is off. 383 */ 384 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 385 wh, "WEP", "%s", "PRIVACY off"); 386 ic->ic_stats.is_rx_noprivacy++; 387 IEEE80211_NODE_STAT(ni, rx_noprivacy); 388 goto out; 389 } 390 key = ieee80211_crypto_decap(ic, ni, m, hdrspace); 391 if (key == NULL) { 392 /* NB: stats+msgs handled in crypto_decap */ 393 IEEE80211_NODE_STAT(ni, rx_wepfail); 394 goto out; 395 } 396 wh = mtod(m, struct ieee80211_frame *); 397 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 398 } else { 399 key = NULL; 400 } 401 402 /* 403 * Next up, any fragmentation. 404 */ 405 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 406 m = ieee80211_defrag(ic, ni, m, hdrspace); 407 if (m == NULL) { 408 /* Fragment dropped or frame not complete yet */ 409 goto out; 410 } 411 } 412 wh = NULL; /* no longer valid, catch any uses */ 413 414 /* 415 * Next strip any MSDU crypto bits. 416 */ 417 if (key != NULL && !ieee80211_crypto_demic(ic, key, m, 0)) { 418 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 419 ni->ni_macaddr, "data", "%s", "demic error"); 420 ic->ic_stats.is_rx_demicfail++; 421 IEEE80211_NODE_STAT(ni, rx_demicfail); 422 goto out; 423 } 424 425 /* copy to listener after decrypt */ 426 if (bpf_peers_present(ic->ic_rawbpf)) 427 bpf_mtap(ic->ic_rawbpf, m); 428 429 /* 430 * Finally, strip the 802.11 header. 431 */ 432 m = ieee80211_decap(ic, m, hdrspace); 433 if (m == NULL) { 434 /* don't count Null data frames as errors */ 435 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA) 436 goto out; 437 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 438 ni->ni_macaddr, "data", "%s", "decap error"); 439 ic->ic_stats.is_rx_decap++; 440 IEEE80211_NODE_STAT(ni, rx_decap); 441 goto err; 442 } 443 eh = mtod(m, struct ether_header *); 444 if (!ieee80211_node_is_authorized(ni)) { 445 /* 446 * Deny any non-PAE frames received prior to 447 * authorization. For open/shared-key 448 * authentication the port is mark authorized 449 * after authentication completes. For 802.1x 450 * the port is not marked authorized by the 451 * authenticator until the handshake has completed. 452 */ 453 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 454 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, 455 eh->ether_shost, "data", 456 "unauthorized port: ether type 0x%x len %u", 457 eh->ether_type, m->m_pkthdr.len); 458 ic->ic_stats.is_rx_unauth++; 459 IEEE80211_NODE_STAT(ni, rx_unauth); 460 goto err; 461 } 462 } else { 463 /* 464 * When denying unencrypted frames, discard 465 * any non-PAE frames received without encryption. 466 */ 467 if ((ic->ic_flags & IEEE80211_F_DROPUNENC) && 468 key == NULL && 469 eh->ether_type != htons(ETHERTYPE_PAE)) { 470 /* 471 * Drop unencrypted frames. 472 */ 473 ic->ic_stats.is_rx_unencrypted++; 474 IEEE80211_NODE_STAT(ni, rx_unencrypted); 475 goto out; 476 } 477 } 478 ieee80211_deliver_data(ic, ni, m); 479 return IEEE80211_FC0_TYPE_DATA; 480 481 case IEEE80211_FC0_TYPE_MGT: 482 ic->ic_stats.is_rx_mgmt++; 483 IEEE80211_NODE_STAT(ni, rx_mgmt); 484 if (dir != IEEE80211_FC1_DIR_NODS) { 485 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 486 wh, "data", "%s", "unknown dir 0x%x", dir); 487 ic->ic_stats.is_rx_wrongdir++; 488 goto err; 489 } 490 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 491 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 492 ni->ni_macaddr, "mgt", "too short: len %u", 493 m->m_pkthdr.len); 494 ic->ic_stats.is_rx_tooshort++; 495 goto out; 496 } 497 #ifdef IEEE80211_DEBUG 498 if ((ieee80211_msg_debug(ic) && doprint(ic, subtype)) || 499 ieee80211_msg_dumppkts(ic)) { 500 if_printf(ic->ic_ifp, "received %s from %s rssi %d\n", 501 ieee80211_mgt_subtype_name[subtype >> 502 IEEE80211_FC0_SUBTYPE_SHIFT], 503 ether_sprintf(wh->i_addr2), rssi); 504 } 505 #endif 506 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 507 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 508 /* 509 * Only shared key auth frames with a challenge 510 * should be encrypted, discard all others. 511 */ 512 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 513 wh, ieee80211_mgt_subtype_name[subtype >> 514 IEEE80211_FC0_SUBTYPE_SHIFT], 515 "%s", "WEP set but not permitted"); 516 ic->ic_stats.is_rx_mgtdiscard++; /* XXX */ 517 goto out; 518 } 519 if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { 520 /* 521 * Discard encrypted frames when privacy is off. 522 */ 523 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 524 wh, "mgt", "%s", "WEP set but PRIVACY off"); 525 ic->ic_stats.is_rx_noprivacy++; 526 goto out; 527 } 528 hdrspace = ieee80211_hdrspace(ic, wh); 529 key = ieee80211_crypto_decap(ic, ni, m, hdrspace); 530 if (key == NULL) { 531 /* NB: stats+msgs handled in crypto_decap */ 532 goto out; 533 } 534 wh = mtod(m, struct ieee80211_frame *); 535 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 536 } 537 if (bpf_peers_present(ic->ic_rawbpf)) 538 bpf_mtap(ic->ic_rawbpf, m); 539 (*ic->ic_recv_mgmt)(ic, m, ni, subtype, rssi, rstamp); 540 m_freem(m); 541 return type; 542 543 case IEEE80211_FC0_TYPE_CTL: 544 ic->ic_stats.is_rx_ctl++; 545 IEEE80211_NODE_STAT(ni, rx_ctrl); 546 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 547 switch (subtype) { 548 case IEEE80211_FC0_SUBTYPE_PS_POLL: 549 ieee80211_recv_pspoll(ic, ni, m); 550 break; 551 } 552 } 553 goto out; 554 default: 555 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 556 wh, NULL, "bad frame type 0x%x", type); 557 /* should not come here */ 558 break; 559 } 560 err: 561 ifp->if_ierrors++; 562 out: 563 if (m != NULL) { 564 if (bpf_peers_present(ic->ic_rawbpf)) 565 bpf_mtap(ic->ic_rawbpf, m); 566 m_freem(m); 567 } 568 return type; 569 #undef SEQ_LEQ 570 } 571 572 /* 573 * This function reassemble fragments. 574 */ 575 static struct mbuf * 576 ieee80211_defrag(struct ieee80211com *ic, struct ieee80211_node *ni, 577 struct mbuf *m, int hdrspace) 578 { 579 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 580 struct ieee80211_frame *lwh; 581 u_int16_t rxseq; 582 u_int8_t fragno; 583 u_int8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 584 struct mbuf *mfrag; 585 586 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 587 588 rxseq = le16toh(*(u_int16_t *)wh->i_seq); 589 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 590 591 /* Quick way out, if there's nothing to defragment */ 592 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 593 return m; 594 595 /* 596 * Remove frag to insure it doesn't get reaped by timer. 597 */ 598 if (ni->ni_table == NULL) { 599 /* 600 * Should never happen. If the node is orphaned (not in 601 * the table) then input packets should not reach here. 602 * Otherwise, a concurrent request that yanks the table 603 * should be blocked by other interlocking and/or by first 604 * shutting the driver down. Regardless, be defensive 605 * here and just bail 606 */ 607 /* XXX need msg+stat */ 608 m_freem(m); 609 return NULL; 610 } 611 IEEE80211_NODE_LOCK(ni->ni_table); 612 mfrag = ni->ni_rxfrag[0]; 613 ni->ni_rxfrag[0] = NULL; 614 IEEE80211_NODE_UNLOCK(ni->ni_table); 615 616 /* 617 * Validate new fragment is in order and 618 * related to the previous ones. 619 */ 620 if (mfrag != NULL) { 621 u_int16_t last_rxseq; 622 623 lwh = mtod(mfrag, struct ieee80211_frame *); 624 last_rxseq = le16toh(*(u_int16_t *)lwh->i_seq); 625 /* NB: check seq # and frag together */ 626 if (rxseq != last_rxseq+1 || 627 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || 628 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 629 /* 630 * Unrelated fragment or no space for it, 631 * clear current fragments. 632 */ 633 m_freem(mfrag); 634 mfrag = NULL; 635 } 636 } 637 638 if (mfrag == NULL) { 639 if (fragno != 0) { /* !first fragment, discard */ 640 ic->ic_stats.is_rx_defrag++; 641 IEEE80211_NODE_STAT(ni, rx_defrag); 642 m_freem(m); 643 return NULL; 644 } 645 mfrag = m; 646 } else { /* concatenate */ 647 m_adj(m, hdrspace); /* strip header */ 648 m_cat(mfrag, m); 649 /* NB: m_cat doesn't update the packet header */ 650 mfrag->m_pkthdr.len += m->m_pkthdr.len; 651 /* track last seqnum and fragno */ 652 lwh = mtod(mfrag, struct ieee80211_frame *); 653 *(u_int16_t *) lwh->i_seq = *(u_int16_t *) wh->i_seq; 654 } 655 if (more_frag) { /* more to come, save */ 656 ni->ni_rxfragstamp = ticks; 657 ni->ni_rxfrag[0] = mfrag; 658 mfrag = NULL; 659 } 660 return mfrag; 661 } 662 663 static void 664 ieee80211_deliver_data(struct ieee80211com *ic, 665 struct ieee80211_node *ni, struct mbuf *m) 666 { 667 struct ether_header *eh = mtod(m, struct ether_header *); 668 struct ifnet *ifp = ic->ic_ifp; 669 670 /* 671 * Do accounting. 672 */ 673 ifp->if_ipackets++; 674 IEEE80211_NODE_STAT(ni, rx_data); 675 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 676 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 677 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 678 IEEE80211_NODE_STAT(ni, rx_mcast); 679 } else 680 IEEE80211_NODE_STAT(ni, rx_ucast); 681 682 /* perform as a bridge within the AP */ 683 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 684 (ic->ic_flags & IEEE80211_F_NOBRIDGE) == 0) { 685 struct mbuf *m1 = NULL; 686 687 if (m->m_flags & M_MCAST) { 688 m1 = m_dup(m, M_DONTWAIT); 689 if (m1 == NULL) 690 ifp->if_oerrors++; 691 else 692 m1->m_flags |= M_MCAST; 693 } else { 694 /* 695 * Check if the destination is known; if so 696 * and the port is authorized dispatch directly. 697 */ 698 struct ieee80211_node *sta = 699 ieee80211_find_node(&ic->ic_sta, eh->ether_dhost); 700 if (sta != NULL) { 701 if (ieee80211_node_is_authorized(sta)) { 702 /* 703 * Beware of sending to ourself; this 704 * needs to happen via the normal 705 * input path. 706 */ 707 if (sta != ic->ic_bss) { 708 m1 = m; 709 m = NULL; 710 } 711 } else { 712 ic->ic_stats.is_rx_unauth++; 713 IEEE80211_NODE_STAT(sta, rx_unauth); 714 } 715 ieee80211_free_node(sta); 716 } 717 } 718 if (m1 != NULL) 719 IF_HANDOFF(&ifp->if_snd, m1, ifp); 720 } 721 if (m != NULL) { 722 m->m_pkthdr.rcvif = ifp; 723 if (ni->ni_vlan != 0) { 724 /* attach vlan tag */ 725 m->m_pkthdr.ether_vtag = ni->ni_vlan; 726 m->m_flags |= M_VLANTAG; 727 } 728 (*ifp->if_input)(ifp, m); 729 } 730 } 731 732 static struct mbuf * 733 ieee80211_decap(struct ieee80211com *ic, struct mbuf *m, int hdrlen) 734 { 735 struct ieee80211_qosframe_addr4 wh; /* Max size address frames */ 736 struct ether_header *eh; 737 struct llc *llc; 738 739 if (m->m_len < hdrlen + sizeof(*llc) && 740 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 741 /* XXX stat, msg */ 742 return NULL; 743 } 744 memcpy(&wh, mtod(m, caddr_t), hdrlen); 745 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 746 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 747 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 748 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0) { 749 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 750 llc = NULL; 751 } else { 752 m_adj(m, hdrlen - sizeof(*eh)); 753 } 754 eh = mtod(m, struct ether_header *); 755 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 756 case IEEE80211_FC1_DIR_NODS: 757 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 758 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 759 break; 760 case IEEE80211_FC1_DIR_TODS: 761 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 762 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 763 break; 764 case IEEE80211_FC1_DIR_FROMDS: 765 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 766 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 767 break; 768 case IEEE80211_FC1_DIR_DSTODS: 769 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 770 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 771 break; 772 } 773 #ifdef ALIGNED_POINTER 774 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), u_int32_t)) { 775 struct mbuf *n, *n0, **np; 776 caddr_t newdata; 777 int off, pktlen; 778 779 n0 = NULL; 780 np = &n0; 781 off = 0; 782 pktlen = m->m_pkthdr.len; 783 while (pktlen > off) { 784 if (n0 == NULL) { 785 MGETHDR(n, M_DONTWAIT, MT_DATA); 786 if (n == NULL) { 787 m_freem(m); 788 return NULL; 789 } 790 M_MOVE_PKTHDR(n, m); 791 n->m_len = MHLEN; 792 } else { 793 MGET(n, M_DONTWAIT, MT_DATA); 794 if (n == NULL) { 795 m_freem(m); 796 m_freem(n0); 797 return NULL; 798 } 799 n->m_len = MLEN; 800 } 801 if (pktlen - off >= MINCLSIZE) { 802 MCLGET(n, M_DONTWAIT); 803 if (n->m_flags & M_EXT) 804 n->m_len = n->m_ext.ext_size; 805 } 806 if (n0 == NULL) { 807 newdata = 808 (caddr_t)ALIGN(n->m_data + sizeof(*eh)) - 809 sizeof(*eh); 810 n->m_len -= newdata - n->m_data; 811 n->m_data = newdata; 812 } 813 if (n->m_len > pktlen - off) 814 n->m_len = pktlen - off; 815 m_copydata(m, off, n->m_len, mtod(n, caddr_t)); 816 off += n->m_len; 817 *np = n; 818 np = &n->m_next; 819 } 820 m_freem(m); 821 m = n0; 822 } 823 #endif /* ALIGNED_POINTER */ 824 if (llc != NULL) { 825 eh = mtod(m, struct ether_header *); 826 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 827 } 828 return m; 829 } 830 831 /* 832 * Install received rate set information in the node's state block. 833 */ 834 int 835 ieee80211_setup_rates(struct ieee80211_node *ni, 836 const u_int8_t *rates, const u_int8_t *xrates, int flags) 837 { 838 struct ieee80211com *ic = ni->ni_ic; 839 struct ieee80211_rateset *rs = &ni->ni_rates; 840 841 memset(rs, 0, sizeof(*rs)); 842 rs->rs_nrates = rates[1]; 843 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 844 if (xrates != NULL) { 845 u_int8_t nxrates; 846 /* 847 * Tack on 11g extended supported rate element. 848 */ 849 nxrates = xrates[1]; 850 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 851 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 852 IEEE80211_DPRINTF(ic, IEEE80211_MSG_XRATE, 853 "[%s] extended rate set too large;" 854 " only using %u of %u rates\n", 855 ether_sprintf(ni->ni_macaddr), nxrates, xrates[1]); 856 ic->ic_stats.is_rx_rstoobig++; 857 } 858 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 859 rs->rs_nrates += nxrates; 860 } 861 return ieee80211_fix_rate(ni, flags); 862 } 863 864 static void 865 ieee80211_auth_open(struct ieee80211com *ic, struct ieee80211_frame *wh, 866 struct ieee80211_node *ni, int rssi, u_int32_t rstamp, u_int16_t seq, 867 u_int16_t status) 868 { 869 870 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 871 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 872 ni->ni_macaddr, "open auth", 873 "bad sta auth mode %u", ni->ni_authmode); 874 ic->ic_stats.is_rx_bad_auth++; /* XXX */ 875 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 876 /* 877 * Clear any challenge text that may be there if 878 * a previous shared key auth failed and then an 879 * open auth is attempted. 880 */ 881 if (ni->ni_challenge != NULL) { 882 FREE(ni->ni_challenge, M_DEVBUF); 883 ni->ni_challenge = NULL; 884 } 885 /* XXX hack to workaround calling convention */ 886 ieee80211_send_error(ic, ni, wh->i_addr2, 887 IEEE80211_FC0_SUBTYPE_AUTH, 888 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 889 } 890 return; 891 } 892 switch (ic->ic_opmode) { 893 case IEEE80211_M_IBSS: 894 case IEEE80211_M_AHDEMO: 895 case IEEE80211_M_MONITOR: 896 /* should not come here */ 897 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 898 ni->ni_macaddr, "open auth", 899 "bad operating mode %u", ic->ic_opmode); 900 break; 901 902 case IEEE80211_M_HOSTAP: 903 if (ic->ic_state != IEEE80211_S_RUN || 904 seq != IEEE80211_AUTH_OPEN_REQUEST) { 905 ic->ic_stats.is_rx_bad_auth++; 906 return; 907 } 908 /* always accept open authentication requests */ 909 if (ni == ic->ic_bss) { 910 ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2); 911 if (ni == NULL) 912 return; 913 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 914 (void) ieee80211_ref_node(ni); 915 /* 916 * Mark the node as referenced to reflect that it's 917 * reference count has been bumped to insure it remains 918 * after the transaction completes. 919 */ 920 ni->ni_flags |= IEEE80211_NODE_AREF; 921 922 IEEE80211_SEND_MGMT(ic, ni, 923 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 924 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 925 "[%s] station authenticated (open)\n", 926 ether_sprintf(ni->ni_macaddr)); 927 /* 928 * When 802.1x is not in use mark the port 929 * authorized at this point so traffic can flow. 930 */ 931 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 932 ieee80211_node_authorize(ni); 933 break; 934 935 case IEEE80211_M_STA: 936 if (ic->ic_state != IEEE80211_S_AUTH || 937 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 938 ic->ic_stats.is_rx_bad_auth++; 939 return; 940 } 941 if (status != 0) { 942 IEEE80211_DPRINTF(ic, 943 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 944 "[%s] open auth failed (reason %d)\n", 945 ether_sprintf(ni->ni_macaddr), status); 946 /* XXX can this happen? */ 947 if (ni != ic->ic_bss) 948 ni->ni_fails++; 949 ic->ic_stats.is_rx_auth_fail++; 950 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 951 } else 952 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 953 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 954 break; 955 } 956 } 957 958 /* 959 * Send a management frame error response to the specified 960 * station. If ni is associated with the station then use 961 * it; otherwise allocate a temporary node suitable for 962 * transmitting the frame and then free the reference so 963 * it will go away as soon as the frame has been transmitted. 964 */ 965 static void 966 ieee80211_send_error(struct ieee80211com *ic, struct ieee80211_node *ni, 967 const u_int8_t *mac, int subtype, int arg) 968 { 969 int istmp; 970 971 if (ni == ic->ic_bss) { 972 ni = ieee80211_tmp_node(ic, mac); 973 if (ni == NULL) { 974 /* XXX msg */ 975 return; 976 } 977 istmp = 1; 978 } else 979 istmp = 0; 980 IEEE80211_SEND_MGMT(ic, ni, subtype, arg); 981 if (istmp) 982 ieee80211_free_node(ni); 983 } 984 985 static int 986 alloc_challenge(struct ieee80211com *ic, struct ieee80211_node *ni) 987 { 988 if (ni->ni_challenge == NULL) 989 MALLOC(ni->ni_challenge, u_int32_t*, IEEE80211_CHALLENGE_LEN, 990 M_DEVBUF, M_NOWAIT); 991 if (ni->ni_challenge == NULL) { 992 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 993 "[%s] shared key challenge alloc failed\n", 994 ether_sprintf(ni->ni_macaddr)); 995 /* XXX statistic */ 996 } 997 return (ni->ni_challenge != NULL); 998 } 999 1000 /* XXX TODO: add statistics */ 1001 static void 1002 ieee80211_auth_shared(struct ieee80211com *ic, struct ieee80211_frame *wh, 1003 u_int8_t *frm, u_int8_t *efrm, struct ieee80211_node *ni, int rssi, 1004 u_int32_t rstamp, u_int16_t seq, u_int16_t status) 1005 { 1006 u_int8_t *challenge; 1007 int allocbs, estatus; 1008 1009 /* 1010 * NB: this can happen as we allow pre-shared key 1011 * authentication to be enabled w/o wep being turned 1012 * on so that configuration of these can be done 1013 * in any order. It may be better to enforce the 1014 * ordering in which case this check would just be 1015 * for sanity/consistency. 1016 */ 1017 if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { 1018 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1019 ni->ni_macaddr, "shared key auth", 1020 "%s", " PRIVACY is disabled"); 1021 estatus = IEEE80211_STATUS_ALG; 1022 goto bad; 1023 } 1024 /* 1025 * Pre-shared key authentication is evil; accept 1026 * it only if explicitly configured (it is supported 1027 * mainly for compatibility with clients like OS X). 1028 */ 1029 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1030 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1031 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1032 ni->ni_macaddr, "shared key auth", 1033 "bad sta auth mode %u", ni->ni_authmode); 1034 ic->ic_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1035 estatus = IEEE80211_STATUS_ALG; 1036 goto bad; 1037 } 1038 1039 challenge = NULL; 1040 if (frm + 1 < efrm) { 1041 if ((frm[1] + 2) > (efrm - frm)) { 1042 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1043 ni->ni_macaddr, "shared key auth", 1044 "ie %d/%d too long", 1045 frm[0], (frm[1] + 2) - (efrm - frm)); 1046 ic->ic_stats.is_rx_bad_auth++; 1047 estatus = IEEE80211_STATUS_CHALLENGE; 1048 goto bad; 1049 } 1050 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1051 challenge = frm; 1052 frm += frm[1] + 2; 1053 } 1054 switch (seq) { 1055 case IEEE80211_AUTH_SHARED_CHALLENGE: 1056 case IEEE80211_AUTH_SHARED_RESPONSE: 1057 if (challenge == NULL) { 1058 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1059 ni->ni_macaddr, "shared key auth", 1060 "%s", "no challenge"); 1061 ic->ic_stats.is_rx_bad_auth++; 1062 estatus = IEEE80211_STATUS_CHALLENGE; 1063 goto bad; 1064 } 1065 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1066 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1067 ni->ni_macaddr, "shared key auth", 1068 "bad challenge len %d", challenge[1]); 1069 ic->ic_stats.is_rx_bad_auth++; 1070 estatus = IEEE80211_STATUS_CHALLENGE; 1071 goto bad; 1072 } 1073 default: 1074 break; 1075 } 1076 switch (ic->ic_opmode) { 1077 case IEEE80211_M_MONITOR: 1078 case IEEE80211_M_AHDEMO: 1079 case IEEE80211_M_IBSS: 1080 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1081 ni->ni_macaddr, "shared key auth", 1082 "bad operating mode %u", ic->ic_opmode); 1083 return; 1084 case IEEE80211_M_HOSTAP: 1085 if (ic->ic_state != IEEE80211_S_RUN) { 1086 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1087 ni->ni_macaddr, "shared key auth", 1088 "bad state %u", ic->ic_state); 1089 estatus = IEEE80211_STATUS_ALG; /* XXX */ 1090 goto bad; 1091 } 1092 switch (seq) { 1093 case IEEE80211_AUTH_SHARED_REQUEST: 1094 if (ni == ic->ic_bss) { 1095 ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2); 1096 if (ni == NULL) { 1097 /* NB: no way to return an error */ 1098 return; 1099 } 1100 allocbs = 1; 1101 } else { 1102 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1103 (void) ieee80211_ref_node(ni); 1104 allocbs = 0; 1105 } 1106 /* 1107 * Mark the node as referenced to reflect that it's 1108 * reference count has been bumped to insure it remains 1109 * after the transaction completes. 1110 */ 1111 ni->ni_flags |= IEEE80211_NODE_AREF; 1112 ni->ni_rssi = rssi; 1113 ni->ni_rstamp = rstamp; 1114 if (!alloc_challenge(ic, ni)) { 1115 /* NB: don't return error so they rexmit */ 1116 return; 1117 } 1118 get_random_bytes(ni->ni_challenge, 1119 IEEE80211_CHALLENGE_LEN); 1120 IEEE80211_DPRINTF(ic, 1121 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1122 "[%s] shared key %sauth request\n", 1123 ether_sprintf(ni->ni_macaddr), 1124 allocbs ? "" : "re"); 1125 break; 1126 case IEEE80211_AUTH_SHARED_RESPONSE: 1127 if (ni == ic->ic_bss) { 1128 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1129 ni->ni_macaddr, "shared key response", 1130 "%s", "unknown station"); 1131 /* NB: don't send a response */ 1132 return; 1133 } 1134 if (ni->ni_challenge == NULL) { 1135 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1136 ni->ni_macaddr, "shared key response", 1137 "%s", "no challenge recorded"); 1138 ic->ic_stats.is_rx_bad_auth++; 1139 estatus = IEEE80211_STATUS_CHALLENGE; 1140 goto bad; 1141 } 1142 if (memcmp(ni->ni_challenge, &challenge[2], 1143 challenge[1]) != 0) { 1144 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1145 ni->ni_macaddr, "shared key response", 1146 "%s", "challenge mismatch"); 1147 ic->ic_stats.is_rx_auth_fail++; 1148 estatus = IEEE80211_STATUS_CHALLENGE; 1149 goto bad; 1150 } 1151 IEEE80211_DPRINTF(ic, 1152 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1153 "[%s] station authenticated (shared key)\n", 1154 ether_sprintf(ni->ni_macaddr)); 1155 ieee80211_node_authorize(ni); 1156 break; 1157 default: 1158 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, 1159 ni->ni_macaddr, "shared key auth", 1160 "bad seq %d", seq); 1161 ic->ic_stats.is_rx_bad_auth++; 1162 estatus = IEEE80211_STATUS_SEQUENCE; 1163 goto bad; 1164 } 1165 IEEE80211_SEND_MGMT(ic, ni, 1166 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1167 break; 1168 1169 case IEEE80211_M_STA: 1170 if (ic->ic_state != IEEE80211_S_AUTH) 1171 return; 1172 switch (seq) { 1173 case IEEE80211_AUTH_SHARED_PASS: 1174 if (ni->ni_challenge != NULL) { 1175 FREE(ni->ni_challenge, M_DEVBUF); 1176 ni->ni_challenge = NULL; 1177 } 1178 if (status != 0) { 1179 IEEE80211_DPRINTF(ic, 1180 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1181 "[%s] shared key auth failed (reason %d)\n", 1182 ether_sprintf(ieee80211_getbssid(ic, wh)), 1183 status); 1184 /* XXX can this happen? */ 1185 if (ni != ic->ic_bss) 1186 ni->ni_fails++; 1187 ic->ic_stats.is_rx_auth_fail++; 1188 return; 1189 } 1190 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 1191 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 1192 break; 1193 case IEEE80211_AUTH_SHARED_CHALLENGE: 1194 if (!alloc_challenge(ic, ni)) 1195 return; 1196 /* XXX could optimize by passing recvd challenge */ 1197 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1198 IEEE80211_SEND_MGMT(ic, ni, 1199 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1200 break; 1201 default: 1202 IEEE80211_DISCARD(ic, IEEE80211_MSG_AUTH, 1203 wh, "shared key auth", "bad seq %d", seq); 1204 ic->ic_stats.is_rx_bad_auth++; 1205 return; 1206 } 1207 break; 1208 } 1209 return; 1210 bad: 1211 /* 1212 * Send an error response; but only when operating as an AP. 1213 */ 1214 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 1215 /* XXX hack to workaround calling convention */ 1216 ieee80211_send_error(ic, ni, wh->i_addr2, 1217 IEEE80211_FC0_SUBTYPE_AUTH, 1218 (seq + 1) | (estatus<<16)); 1219 } else if (ic->ic_opmode == IEEE80211_M_STA) { 1220 /* 1221 * Kick the state machine. This short-circuits 1222 * using the mgt frame timeout to trigger the 1223 * state transition. 1224 */ 1225 if (ic->ic_state == IEEE80211_S_AUTH) 1226 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 1227 } 1228 } 1229 1230 /* Verify the existence and length of __elem or get out. */ 1231 #define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen) do { \ 1232 if ((__elem) == NULL) { \ 1233 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ 1234 wh, ieee80211_mgt_subtype_name[subtype >> \ 1235 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1236 "%s", "no " #__elem ); \ 1237 ic->ic_stats.is_rx_elem_missing++; \ 1238 return; \ 1239 } \ 1240 if ((__elem)[1] > (__maxlen)) { \ 1241 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ 1242 wh, ieee80211_mgt_subtype_name[subtype >> \ 1243 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1244 "bad " #__elem " len %d", (__elem)[1]); \ 1245 ic->ic_stats.is_rx_elem_toobig++; \ 1246 return; \ 1247 } \ 1248 } while (0) 1249 1250 #define IEEE80211_VERIFY_LENGTH(_len, _minlen) do { \ 1251 if ((_len) < (_minlen)) { \ 1252 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ 1253 wh, ieee80211_mgt_subtype_name[subtype >> \ 1254 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1255 "%s", "ie too short"); \ 1256 ic->ic_stats.is_rx_elem_toosmall++; \ 1257 return; \ 1258 } \ 1259 } while (0) 1260 1261 #ifdef IEEE80211_DEBUG 1262 static void 1263 ieee80211_ssid_mismatch(struct ieee80211com *ic, const char *tag, 1264 u_int8_t mac[IEEE80211_ADDR_LEN], u_int8_t *ssid) 1265 { 1266 printf("[%s] discard %s frame, ssid mismatch: ", 1267 ether_sprintf(mac), tag); 1268 ieee80211_print_essid(ssid + 2, ssid[1]); 1269 printf("\n"); 1270 } 1271 1272 #define IEEE80211_VERIFY_SSID(_ni, _ssid) do { \ 1273 if ((_ssid)[1] != 0 && \ 1274 ((_ssid)[1] != (_ni)->ni_esslen || \ 1275 memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \ 1276 if (ieee80211_msg_input(ic)) \ 1277 ieee80211_ssid_mismatch(ic, \ 1278 ieee80211_mgt_subtype_name[subtype >> \ 1279 IEEE80211_FC0_SUBTYPE_SHIFT], \ 1280 wh->i_addr2, _ssid); \ 1281 ic->ic_stats.is_rx_ssidmismatch++; \ 1282 return; \ 1283 } \ 1284 } while (0) 1285 #else /* !IEEE80211_DEBUG */ 1286 #define IEEE80211_VERIFY_SSID(_ni, _ssid) do { \ 1287 if ((_ssid)[1] != 0 && \ 1288 ((_ssid)[1] != (_ni)->ni_esslen || \ 1289 memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \ 1290 ic->ic_stats.is_rx_ssidmismatch++; \ 1291 return; \ 1292 } \ 1293 } while (0) 1294 #endif /* !IEEE80211_DEBUG */ 1295 1296 /* unalligned little endian access */ 1297 #define LE_READ_2(p) \ 1298 ((u_int16_t) \ 1299 ((((const u_int8_t *)(p))[0] ) | \ 1300 (((const u_int8_t *)(p))[1] << 8))) 1301 #define LE_READ_4(p) \ 1302 ((u_int32_t) \ 1303 ((((const u_int8_t *)(p))[0] ) | \ 1304 (((const u_int8_t *)(p))[1] << 8) | \ 1305 (((const u_int8_t *)(p))[2] << 16) | \ 1306 (((const u_int8_t *)(p))[3] << 24))) 1307 1308 static int __inline 1309 iswpaoui(const u_int8_t *frm) 1310 { 1311 return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI); 1312 } 1313 1314 static int __inline 1315 iswmeoui(const u_int8_t *frm) 1316 { 1317 return frm[1] > 3 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI); 1318 } 1319 1320 static int __inline 1321 iswmeparam(const u_int8_t *frm) 1322 { 1323 return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) && 1324 frm[6] == WME_PARAM_OUI_SUBTYPE; 1325 } 1326 1327 static int __inline 1328 iswmeinfo(const u_int8_t *frm) 1329 { 1330 return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) && 1331 frm[6] == WME_INFO_OUI_SUBTYPE; 1332 } 1333 1334 static int __inline 1335 isatherosoui(const u_int8_t *frm) 1336 { 1337 return frm[1] > 3 && LE_READ_4(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI); 1338 } 1339 1340 /* 1341 * Convert a WPA cipher selector OUI to an internal 1342 * cipher algorithm. Where appropriate we also 1343 * record any key length. 1344 */ 1345 static int 1346 wpa_cipher(u_int8_t *sel, u_int8_t *keylen) 1347 { 1348 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1349 u_int32_t w = LE_READ_4(sel); 1350 1351 switch (w) { 1352 case WPA_SEL(WPA_CSE_NULL): 1353 return IEEE80211_CIPHER_NONE; 1354 case WPA_SEL(WPA_CSE_WEP40): 1355 if (keylen) 1356 *keylen = 40 / NBBY; 1357 return IEEE80211_CIPHER_WEP; 1358 case WPA_SEL(WPA_CSE_WEP104): 1359 if (keylen) 1360 *keylen = 104 / NBBY; 1361 return IEEE80211_CIPHER_WEP; 1362 case WPA_SEL(WPA_CSE_TKIP): 1363 return IEEE80211_CIPHER_TKIP; 1364 case WPA_SEL(WPA_CSE_CCMP): 1365 return IEEE80211_CIPHER_AES_CCM; 1366 } 1367 return 32; /* NB: so 1<< is discarded */ 1368 #undef WPA_SEL 1369 } 1370 1371 /* 1372 * Convert a WPA key management/authentication algorithm 1373 * to an internal code. 1374 */ 1375 static int 1376 wpa_keymgmt(u_int8_t *sel) 1377 { 1378 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1379 u_int32_t w = LE_READ_4(sel); 1380 1381 switch (w) { 1382 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1383 return WPA_ASE_8021X_UNSPEC; 1384 case WPA_SEL(WPA_ASE_8021X_PSK): 1385 return WPA_ASE_8021X_PSK; 1386 case WPA_SEL(WPA_ASE_NONE): 1387 return WPA_ASE_NONE; 1388 } 1389 return 0; /* NB: so is discarded */ 1390 #undef WPA_SEL 1391 } 1392 1393 /* 1394 * Parse a WPA information element to collect parameters 1395 * and validate the parameters against what has been 1396 * configured for the system. 1397 */ 1398 static int 1399 ieee80211_parse_wpa(struct ieee80211com *ic, u_int8_t *frm, 1400 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1401 { 1402 u_int8_t len = frm[1]; 1403 u_int32_t w; 1404 int n; 1405 1406 /* 1407 * Check the length once for fixed parts: OUI, type, 1408 * version, mcast cipher, and 2 selector counts. 1409 * Other, variable-length data, must be checked separately. 1410 */ 1411 if ((ic->ic_flags & IEEE80211_F_WPA1) == 0) { 1412 IEEE80211_DISCARD_IE(ic, 1413 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1414 wh, "WPA", "not WPA, flags 0x%x", ic->ic_flags); 1415 return IEEE80211_REASON_IE_INVALID; 1416 } 1417 if (len < 14) { 1418 IEEE80211_DISCARD_IE(ic, 1419 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1420 wh, "WPA", "too short, len %u", len); 1421 return IEEE80211_REASON_IE_INVALID; 1422 } 1423 frm += 6, len -= 4; /* NB: len is payload only */ 1424 /* NB: iswapoui already validated the OUI and type */ 1425 w = LE_READ_2(frm); 1426 if (w != WPA_VERSION) { 1427 IEEE80211_DISCARD_IE(ic, 1428 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1429 wh, "WPA", "bad version %u", w); 1430 return IEEE80211_REASON_IE_INVALID; 1431 } 1432 frm += 2, len -= 2; 1433 1434 /* multicast/group cipher */ 1435 w = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1436 if (w != rsn->rsn_mcastcipher) { 1437 IEEE80211_DISCARD_IE(ic, 1438 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1439 wh, "WPA", "mcast cipher mismatch; got %u, expected %u", 1440 w, rsn->rsn_mcastcipher); 1441 return IEEE80211_REASON_IE_INVALID; 1442 } 1443 frm += 4, len -= 4; 1444 1445 /* unicast ciphers */ 1446 n = LE_READ_2(frm); 1447 frm += 2, len -= 2; 1448 if (len < n*4+2) { 1449 IEEE80211_DISCARD_IE(ic, 1450 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1451 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1452 len, n); 1453 return IEEE80211_REASON_IE_INVALID; 1454 } 1455 w = 0; 1456 for (; n > 0; n--) { 1457 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1458 frm += 4, len -= 4; 1459 } 1460 w &= rsn->rsn_ucastcipherset; 1461 if (w == 0) { 1462 IEEE80211_DISCARD_IE(ic, 1463 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1464 wh, "WPA", "%s", "ucast cipher set empty"); 1465 return IEEE80211_REASON_IE_INVALID; 1466 } 1467 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1468 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1469 else 1470 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1471 1472 /* key management algorithms */ 1473 n = LE_READ_2(frm); 1474 frm += 2, len -= 2; 1475 if (len < n*4) { 1476 IEEE80211_DISCARD_IE(ic, 1477 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1478 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1479 len, n); 1480 return IEEE80211_REASON_IE_INVALID; 1481 } 1482 w = 0; 1483 for (; n > 0; n--) { 1484 w |= wpa_keymgmt(frm); 1485 frm += 4, len -= 4; 1486 } 1487 w &= rsn->rsn_keymgmtset; 1488 if (w == 0) { 1489 IEEE80211_DISCARD_IE(ic, 1490 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1491 wh, "WPA", "%s", "no acceptable key mgmt alg"); 1492 return IEEE80211_REASON_IE_INVALID; 1493 } 1494 if (w & WPA_ASE_8021X_UNSPEC) 1495 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1496 else 1497 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1498 1499 if (len > 2) /* optional capabilities */ 1500 rsn->rsn_caps = LE_READ_2(frm); 1501 1502 return 0; 1503 } 1504 1505 /* 1506 * Convert an RSN cipher selector OUI to an internal 1507 * cipher algorithm. Where appropriate we also 1508 * record any key length. 1509 */ 1510 static int 1511 rsn_cipher(u_int8_t *sel, u_int8_t *keylen) 1512 { 1513 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1514 u_int32_t w = LE_READ_4(sel); 1515 1516 switch (w) { 1517 case RSN_SEL(RSN_CSE_NULL): 1518 return IEEE80211_CIPHER_NONE; 1519 case RSN_SEL(RSN_CSE_WEP40): 1520 if (keylen) 1521 *keylen = 40 / NBBY; 1522 return IEEE80211_CIPHER_WEP; 1523 case RSN_SEL(RSN_CSE_WEP104): 1524 if (keylen) 1525 *keylen = 104 / NBBY; 1526 return IEEE80211_CIPHER_WEP; 1527 case RSN_SEL(RSN_CSE_TKIP): 1528 return IEEE80211_CIPHER_TKIP; 1529 case RSN_SEL(RSN_CSE_CCMP): 1530 return IEEE80211_CIPHER_AES_CCM; 1531 case RSN_SEL(RSN_CSE_WRAP): 1532 return IEEE80211_CIPHER_AES_OCB; 1533 } 1534 return 32; /* NB: so 1<< is discarded */ 1535 #undef WPA_SEL 1536 } 1537 1538 /* 1539 * Convert an RSN key management/authentication algorithm 1540 * to an internal code. 1541 */ 1542 static int 1543 rsn_keymgmt(u_int8_t *sel) 1544 { 1545 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1546 u_int32_t w = LE_READ_4(sel); 1547 1548 switch (w) { 1549 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1550 return RSN_ASE_8021X_UNSPEC; 1551 case RSN_SEL(RSN_ASE_8021X_PSK): 1552 return RSN_ASE_8021X_PSK; 1553 case RSN_SEL(RSN_ASE_NONE): 1554 return RSN_ASE_NONE; 1555 } 1556 return 0; /* NB: so is discarded */ 1557 #undef RSN_SEL 1558 } 1559 1560 /* 1561 * Parse a WPA/RSN information element to collect parameters 1562 * and validate the parameters against what has been 1563 * configured for the system. 1564 */ 1565 static int 1566 ieee80211_parse_rsn(struct ieee80211com *ic, u_int8_t *frm, 1567 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1568 { 1569 u_int8_t len = frm[1]; 1570 u_int32_t w; 1571 int n; 1572 1573 /* 1574 * Check the length once for fixed parts: 1575 * version, mcast cipher, and 2 selector counts. 1576 * Other, variable-length data, must be checked separately. 1577 */ 1578 if ((ic->ic_flags & IEEE80211_F_WPA2) == 0) { 1579 IEEE80211_DISCARD_IE(ic, 1580 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1581 wh, "WPA", "not RSN, flags 0x%x", ic->ic_flags); 1582 return IEEE80211_REASON_IE_INVALID; 1583 } 1584 if (len < 10) { 1585 IEEE80211_DISCARD_IE(ic, 1586 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1587 wh, "RSN", "too short, len %u", len); 1588 return IEEE80211_REASON_IE_INVALID; 1589 } 1590 frm += 2; 1591 w = LE_READ_2(frm); 1592 if (w != RSN_VERSION) { 1593 IEEE80211_DISCARD_IE(ic, 1594 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1595 wh, "RSN", "bad version %u", w); 1596 return IEEE80211_REASON_IE_INVALID; 1597 } 1598 frm += 2, len -= 2; 1599 1600 /* multicast/group cipher */ 1601 w = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1602 if (w != rsn->rsn_mcastcipher) { 1603 IEEE80211_DISCARD_IE(ic, 1604 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1605 wh, "RSN", "mcast cipher mismatch; got %u, expected %u", 1606 w, rsn->rsn_mcastcipher); 1607 return IEEE80211_REASON_IE_INVALID; 1608 } 1609 frm += 4, len -= 4; 1610 1611 /* unicast ciphers */ 1612 n = LE_READ_2(frm); 1613 frm += 2, len -= 2; 1614 if (len < n*4+2) { 1615 IEEE80211_DISCARD_IE(ic, 1616 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1617 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1618 len, n); 1619 return IEEE80211_REASON_IE_INVALID; 1620 } 1621 w = 0; 1622 for (; n > 0; n--) { 1623 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1624 frm += 4, len -= 4; 1625 } 1626 w &= rsn->rsn_ucastcipherset; 1627 if (w == 0) { 1628 IEEE80211_DISCARD_IE(ic, 1629 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1630 wh, "RSN", "%s", "ucast cipher set empty"); 1631 return IEEE80211_REASON_IE_INVALID; 1632 } 1633 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1634 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1635 else 1636 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1637 1638 /* key management algorithms */ 1639 n = LE_READ_2(frm); 1640 frm += 2, len -= 2; 1641 if (len < n*4) { 1642 IEEE80211_DISCARD_IE(ic, 1643 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1644 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1645 len, n); 1646 return IEEE80211_REASON_IE_INVALID; 1647 } 1648 w = 0; 1649 for (; n > 0; n--) { 1650 w |= rsn_keymgmt(frm); 1651 frm += 4, len -= 4; 1652 } 1653 w &= rsn->rsn_keymgmtset; 1654 if (w == 0) { 1655 IEEE80211_DISCARD_IE(ic, 1656 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1657 wh, "RSN", "%s", "no acceptable key mgmt alg"); 1658 return IEEE80211_REASON_IE_INVALID; 1659 } 1660 if (w & RSN_ASE_8021X_UNSPEC) 1661 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1662 else 1663 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1664 1665 /* optional RSN capabilities */ 1666 if (len > 2) 1667 rsn->rsn_caps = LE_READ_2(frm); 1668 /* XXXPMKID */ 1669 1670 return 0; 1671 } 1672 1673 static int 1674 ieee80211_parse_wmeparams(struct ieee80211com *ic, u_int8_t *frm, 1675 const struct ieee80211_frame *wh) 1676 { 1677 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1678 struct ieee80211_wme_state *wme = &ic->ic_wme; 1679 u_int len = frm[1], qosinfo; 1680 int i; 1681 1682 if (len < sizeof(struct ieee80211_wme_param)-2) { 1683 IEEE80211_DISCARD_IE(ic, 1684 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1685 wh, "WME", "too short, len %u", len); 1686 return -1; 1687 } 1688 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1689 qosinfo &= WME_QOSINFO_COUNT; 1690 /* XXX do proper check for wraparound */ 1691 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1692 return 0; 1693 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1694 for (i = 0; i < WME_NUM_AC; i++) { 1695 struct wmeParams *wmep = 1696 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1697 /* NB: ACI not used */ 1698 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1699 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1700 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1701 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1702 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1703 frm += 4; 1704 } 1705 wme->wme_wmeChanParams.cap_info = qosinfo; 1706 return 1; 1707 #undef MS 1708 } 1709 1710 void 1711 ieee80211_saveie(u_int8_t **iep, const u_int8_t *ie) 1712 { 1713 u_int ielen = ie[1]+2; 1714 /* 1715 * Record information element for later use. 1716 */ 1717 if (*iep == NULL || (*iep)[1] != ie[1]) { 1718 if (*iep != NULL) 1719 FREE(*iep, M_DEVBUF); 1720 MALLOC(*iep, void*, ielen, M_DEVBUF, M_NOWAIT); 1721 } 1722 if (*iep != NULL) 1723 memcpy(*iep, ie, ielen); 1724 /* XXX note failure */ 1725 } 1726 1727 /* XXX find a better place for definition */ 1728 struct l2_update_frame { 1729 struct ether_header eh; 1730 u_int8_t dsap; 1731 u_int8_t ssap; 1732 u_int8_t control; 1733 u_int8_t xid[3]; 1734 } __packed; 1735 1736 /* 1737 * Deliver a TGf L2UF frame on behalf of a station. 1738 * This primes any bridge when the station is roaming 1739 * between ap's on the same wired network. 1740 */ 1741 static void 1742 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1743 { 1744 struct ieee80211com *ic = ni->ni_ic; 1745 struct ifnet *ifp = ic->ic_ifp; 1746 struct mbuf *m; 1747 struct l2_update_frame *l2uf; 1748 struct ether_header *eh; 1749 1750 m = m_gethdr(M_NOWAIT, MT_DATA); 1751 if (m == NULL) { 1752 IEEE80211_NOTE(ic, IEEE80211_MSG_ASSOC, ni, 1753 "%s", "no mbuf for l2uf frame"); 1754 ic->ic_stats.is_rx_nobuf++; /* XXX not right */ 1755 return; 1756 } 1757 l2uf = mtod(m, struct l2_update_frame *); 1758 eh = &l2uf->eh; 1759 /* dst: Broadcast address */ 1760 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1761 /* src: associated STA */ 1762 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1763 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1764 1765 l2uf->dsap = 0; 1766 l2uf->ssap = 0; 1767 l2uf->control = 0xf5; 1768 l2uf->xid[0] = 0x81; 1769 l2uf->xid[1] = 0x80; 1770 l2uf->xid[2] = 0x00; 1771 1772 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1773 ieee80211_deliver_data(ic, ni, m); 1774 } 1775 1776 void 1777 ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0, 1778 struct ieee80211_node *ni, 1779 int subtype, int rssi, u_int32_t rstamp) 1780 { 1781 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1782 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1783 struct ieee80211_frame *wh; 1784 u_int8_t *frm, *efrm; 1785 u_int8_t *ssid, *rates, *xrates, *wpa, *wme; 1786 int reassoc, resp, allocbs; 1787 u_int8_t rate; 1788 1789 wh = mtod(m0, struct ieee80211_frame *); 1790 frm = (u_int8_t *)&wh[1]; 1791 efrm = mtod(m0, u_int8_t *) + m0->m_len; 1792 switch (subtype) { 1793 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1794 case IEEE80211_FC0_SUBTYPE_BEACON: { 1795 struct ieee80211_scanparams scan; 1796 1797 /* 1798 * We process beacon/probe response frames: 1799 * o when scanning, or 1800 * o station mode when associated (to collect state 1801 * updates such as 802.11g slot time), or 1802 * o adhoc mode (to discover neighbors) 1803 * Frames otherwise received are discarded. 1804 */ 1805 if (!((ic->ic_flags & IEEE80211_F_SCAN) || 1806 (ic->ic_opmode == IEEE80211_M_STA && ni->ni_associd) || 1807 ic->ic_opmode == IEEE80211_M_IBSS)) { 1808 ic->ic_stats.is_rx_mgtdiscard++; 1809 return; 1810 } 1811 /* 1812 * beacon/probe response frame format 1813 * [8] time stamp 1814 * [2] beacon interval 1815 * [2] capability information 1816 * [tlv] ssid 1817 * [tlv] supported rates 1818 * [tlv] country information 1819 * [tlv] parameter set (FH/DS) 1820 * [tlv] erp information 1821 * [tlv] extended supported rates 1822 * [tlv] WME 1823 * [tlv] WPA or RSN 1824 */ 1825 IEEE80211_VERIFY_LENGTH(efrm - frm, 12); 1826 memset(&scan, 0, sizeof(scan)); 1827 scan.tstamp = frm; frm += 8; 1828 scan.bintval = le16toh(*(u_int16_t *)frm); frm += 2; 1829 scan.capinfo = le16toh(*(u_int16_t *)frm); frm += 2; 1830 scan.bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 1831 scan.chan = scan.bchan; 1832 1833 while (efrm - frm > 1) { 1834 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2); 1835 switch (*frm) { 1836 case IEEE80211_ELEMID_SSID: 1837 scan.ssid = frm; 1838 break; 1839 case IEEE80211_ELEMID_RATES: 1840 scan.rates = frm; 1841 break; 1842 case IEEE80211_ELEMID_COUNTRY: 1843 scan.country = frm; 1844 break; 1845 case IEEE80211_ELEMID_FHPARMS: 1846 if (ic->ic_phytype == IEEE80211_T_FH) { 1847 scan.fhdwell = LE_READ_2(&frm[2]); 1848 scan.chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 1849 scan.fhindex = frm[6]; 1850 } 1851 break; 1852 case IEEE80211_ELEMID_DSPARMS: 1853 /* 1854 * XXX hack this since depending on phytype 1855 * is problematic for multi-mode devices. 1856 */ 1857 if (ic->ic_phytype != IEEE80211_T_FH) 1858 scan.chan = frm[2]; 1859 break; 1860 case IEEE80211_ELEMID_TIM: 1861 /* XXX ATIM? */ 1862 scan.tim = frm; 1863 scan.timoff = frm - mtod(m0, u_int8_t *); 1864 break; 1865 case IEEE80211_ELEMID_IBSSPARMS: 1866 break; 1867 case IEEE80211_ELEMID_XRATES: 1868 scan.xrates = frm; 1869 break; 1870 case IEEE80211_ELEMID_ERP: 1871 if (frm[1] != 1) { 1872 IEEE80211_DISCARD_IE(ic, 1873 IEEE80211_MSG_ELEMID, wh, "ERP", 1874 "bad len %u", frm[1]); 1875 ic->ic_stats.is_rx_elem_toobig++; 1876 break; 1877 } 1878 scan.erp = frm[2]; 1879 break; 1880 case IEEE80211_ELEMID_RSN: 1881 scan.wpa = frm; 1882 break; 1883 case IEEE80211_ELEMID_VENDOR: 1884 if (iswpaoui(frm)) 1885 scan.wpa = frm; 1886 else if (iswmeparam(frm) || iswmeinfo(frm)) 1887 scan.wme = frm; 1888 /* XXX Atheros OUI support */ 1889 break; 1890 default: 1891 IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID, 1892 wh, "unhandled", 1893 "id %u, len %u", *frm, frm[1]); 1894 ic->ic_stats.is_rx_elem_unknown++; 1895 break; 1896 } 1897 frm += frm[1] + 2; 1898 } 1899 IEEE80211_VERIFY_ELEMENT(scan.rates, IEEE80211_RATE_MAXSIZE); 1900 IEEE80211_VERIFY_ELEMENT(scan.ssid, IEEE80211_NWID_LEN); 1901 if ( 1902 #if IEEE80211_CHAN_MAX < 255 1903 scan.chan > IEEE80211_CHAN_MAX || 1904 #endif 1905 isclr(ic->ic_chan_active, scan.chan)) { 1906 IEEE80211_DISCARD(ic, 1907 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 1908 wh, ieee80211_mgt_subtype_name[subtype >> 1909 IEEE80211_FC0_SUBTYPE_SHIFT], 1910 "invalid channel %u", scan.chan); 1911 ic->ic_stats.is_rx_badchan++; 1912 return; 1913 } 1914 if (scan.chan != scan.bchan && 1915 ic->ic_phytype != IEEE80211_T_FH) { 1916 /* 1917 * Frame was received on a channel different from the 1918 * one indicated in the DS params element id; 1919 * silently discard it. 1920 * 1921 * NB: this can happen due to signal leakage. 1922 * But we should take it for FH phy because 1923 * the rssi value should be correct even for 1924 * different hop pattern in FH. 1925 */ 1926 IEEE80211_DISCARD(ic, 1927 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 1928 wh, ieee80211_mgt_subtype_name[subtype >> 1929 IEEE80211_FC0_SUBTYPE_SHIFT], 1930 "for off-channel %u", scan.chan); 1931 ic->ic_stats.is_rx_chanmismatch++; 1932 return; 1933 } 1934 if (!(IEEE80211_BINTVAL_MIN <= scan.bintval && 1935 scan.bintval <= IEEE80211_BINTVAL_MAX)) { 1936 IEEE80211_DISCARD(ic, 1937 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 1938 wh, ieee80211_mgt_subtype_name[subtype >> 1939 IEEE80211_FC0_SUBTYPE_SHIFT], 1940 "bogus beacon interval", scan.bintval); 1941 ic->ic_stats.is_rx_badbintval++; 1942 return; 1943 } 1944 1945 /* 1946 * Count frame now that we know it's to be processed. 1947 */ 1948 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1949 ic->ic_stats.is_rx_beacon++; /* XXX remove */ 1950 IEEE80211_NODE_STAT(ni, rx_beacons); 1951 } else 1952 IEEE80211_NODE_STAT(ni, rx_proberesp); 1953 1954 /* 1955 * When operating in station mode, check for state updates. 1956 * Be careful to ignore beacons received while doing a 1957 * background scan. We consider only 11g/WMM stuff right now. 1958 */ 1959 if (ic->ic_opmode == IEEE80211_M_STA && 1960 ni->ni_associd != 0 && 1961 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1962 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1963 /* record tsf of last beacon */ 1964 memcpy(ni->ni_tstamp.data, scan.tstamp, 1965 sizeof(ni->ni_tstamp)); 1966 /* count beacon frame for s/w bmiss handling */ 1967 ic->ic_swbmiss_count++; 1968 ic->ic_bmiss_count = 0; 1969 if (ni->ni_erp != scan.erp) { 1970 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1971 "[%s] erp change: was 0x%x, now 0x%x\n", 1972 ether_sprintf(wh->i_addr2), 1973 ni->ni_erp, scan.erp); 1974 if (ic->ic_curmode == IEEE80211_MODE_11G && 1975 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1976 ic->ic_flags |= IEEE80211_F_USEPROT; 1977 else 1978 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1979 ni->ni_erp = scan.erp; 1980 /* XXX statistic */ 1981 } 1982 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1983 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1984 "[%s] capabilities change: before 0x%x," 1985 " now 0x%x\n", 1986 ether_sprintf(wh->i_addr2), 1987 ni->ni_capinfo, scan.capinfo); 1988 /* 1989 * NB: we assume short preamble doesn't 1990 * change dynamically 1991 */ 1992 ieee80211_set_shortslottime(ic, 1993 ic->ic_curmode == IEEE80211_MODE_11A || 1994 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1995 ni->ni_capinfo = scan.capinfo; 1996 /* XXX statistic */ 1997 } 1998 if (scan.wme != NULL && 1999 (ni->ni_flags & IEEE80211_NODE_QOS) && 2000 ieee80211_parse_wmeparams(ic, scan.wme, wh) > 0) 2001 ieee80211_wme_updateparams(ic); 2002 if (scan.tim != NULL) { 2003 struct ieee80211_tim_ie *ie = 2004 (struct ieee80211_tim_ie *) scan.tim; 2005 2006 ni->ni_dtim_count = ie->tim_count; 2007 ni->ni_dtim_period = ie->tim_period; 2008 } 2009 if (ic->ic_flags & IEEE80211_F_SCAN) 2010 ieee80211_add_scan(ic, &scan, wh, 2011 subtype, rssi, rstamp); 2012 return; 2013 } 2014 /* 2015 * If scanning, just pass information to the scan module. 2016 */ 2017 if (ic->ic_flags & IEEE80211_F_SCAN) { 2018 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 2019 /* 2020 * Actively scanning a channel marked passive; 2021 * send a probe request now that we know there 2022 * is 802.11 traffic present. 2023 * 2024 * XXX check if the beacon we recv'd gives 2025 * us what we need and suppress the probe req 2026 */ 2027 ieee80211_probe_curchan(ic, 1); 2028 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 2029 } 2030 ieee80211_add_scan(ic, &scan, wh, 2031 subtype, rssi, rstamp); 2032 return; 2033 } 2034 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 2035 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 2036 /* 2037 * Create a new entry in the neighbor table. 2038 */ 2039 ni = ieee80211_add_neighbor(ic, wh, &scan); 2040 } else if (ni->ni_capinfo == 0) { 2041 /* 2042 * Update faked node created on transmit. 2043 * Note this also updates the tsf. 2044 */ 2045 ieee80211_init_neighbor(ni, wh, &scan); 2046 } else { 2047 /* 2048 * Record tsf for potential resync. 2049 */ 2050 memcpy(ni->ni_tstamp.data, scan.tstamp, 2051 sizeof(ni->ni_tstamp)); 2052 } 2053 if (ni != NULL) { 2054 ni->ni_rssi = rssi; 2055 ni->ni_rstamp = rstamp; 2056 } 2057 } 2058 break; 2059 } 2060 2061 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 2062 if (ic->ic_opmode == IEEE80211_M_STA || 2063 ic->ic_state != IEEE80211_S_RUN) { 2064 ic->ic_stats.is_rx_mgtdiscard++; 2065 return; 2066 } 2067 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 2068 /* frame must be directed */ 2069 ic->ic_stats.is_rx_mgtdiscard++; /* XXX stat */ 2070 return; 2071 } 2072 2073 /* 2074 * prreq frame format 2075 * [tlv] ssid 2076 * [tlv] supported rates 2077 * [tlv] extended supported rates 2078 */ 2079 ssid = rates = xrates = NULL; 2080 while (efrm - frm > 1) { 2081 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2); 2082 switch (*frm) { 2083 case IEEE80211_ELEMID_SSID: 2084 ssid = frm; 2085 break; 2086 case IEEE80211_ELEMID_RATES: 2087 rates = frm; 2088 break; 2089 case IEEE80211_ELEMID_XRATES: 2090 xrates = frm; 2091 break; 2092 } 2093 frm += frm[1] + 2; 2094 } 2095 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 2096 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); 2097 IEEE80211_VERIFY_SSID(ic->ic_bss, ssid); 2098 if ((ic->ic_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 2099 IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, 2100 wh, ieee80211_mgt_subtype_name[subtype >> 2101 IEEE80211_FC0_SUBTYPE_SHIFT], 2102 "%s", "no ssid with ssid suppression enabled"); 2103 ic->ic_stats.is_rx_ssidmismatch++; /*XXX*/ 2104 return; 2105 } 2106 2107 allocbs = 0; 2108 if (ni == ic->ic_bss) { 2109 if (ic->ic_opmode != IEEE80211_M_IBSS) { 2110 ni = ieee80211_tmp_node(ic, wh->i_addr2); 2111 allocbs = 1; 2112 } else if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 2113 /* 2114 * XXX Cannot tell if the sender is operating 2115 * in ibss mode. But we need a new node to 2116 * send the response so blindly add them to the 2117 * neighbor table. 2118 */ 2119 ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta, 2120 wh->i_addr2); 2121 } 2122 if (ni == NULL) 2123 return; 2124 } 2125 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2126 "[%s] recv probe req\n", ether_sprintf(wh->i_addr2)); 2127 ni->ni_rssi = rssi; 2128 ni->ni_rstamp = rstamp; 2129 rate = ieee80211_setup_rates(ni, rates, xrates, 2130 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE 2131 | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2132 if (rate & IEEE80211_RATE_BASIC) { 2133 IEEE80211_DISCARD(ic, IEEE80211_MSG_XRATE, 2134 wh, ieee80211_mgt_subtype_name[subtype >> 2135 IEEE80211_FC0_SUBTYPE_SHIFT], 2136 "%s", "recv'd rate set invalid"); 2137 } else { 2138 IEEE80211_SEND_MGMT(ic, ni, 2139 IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0); 2140 } 2141 if (allocbs) { 2142 /* 2143 * Temporary node created just to send a 2144 * response, reclaim immediately. 2145 */ 2146 ieee80211_free_node(ni); 2147 } 2148 break; 2149 2150 case IEEE80211_FC0_SUBTYPE_AUTH: { 2151 u_int16_t algo, seq, status; 2152 /* 2153 * auth frame format 2154 * [2] algorithm 2155 * [2] sequence 2156 * [2] status 2157 * [tlv*] challenge 2158 */ 2159 IEEE80211_VERIFY_LENGTH(efrm - frm, 6); 2160 algo = le16toh(*(u_int16_t *)frm); 2161 seq = le16toh(*(u_int16_t *)(frm + 2)); 2162 status = le16toh(*(u_int16_t *)(frm + 4)); 2163 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 2164 "[%s] recv auth frame with algorithm %d seq %d\n", 2165 ether_sprintf(wh->i_addr2), algo, seq); 2166 /* 2167 * Consult the ACL policy module if setup. 2168 */ 2169 if (ic->ic_acl != NULL && 2170 !ic->ic_acl->iac_check(ic, wh->i_addr2)) { 2171 IEEE80211_DISCARD(ic, IEEE80211_MSG_ACL, 2172 wh, "auth", "%s", "disallowed by ACL"); 2173 ic->ic_stats.is_rx_acl++; 2174 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 2175 IEEE80211_SEND_MGMT(ic, ni, 2176 IEEE80211_FC0_SUBTYPE_AUTH, 2177 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 2178 } 2179 return; 2180 } 2181 if (ic->ic_flags & IEEE80211_F_COUNTERM) { 2182 IEEE80211_DISCARD(ic, 2183 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 2184 wh, "auth", "%s", "TKIP countermeasures enabled"); 2185 ic->ic_stats.is_rx_auth_countermeasures++; 2186 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 2187 IEEE80211_SEND_MGMT(ic, ni, 2188 IEEE80211_FC0_SUBTYPE_AUTH, 2189 IEEE80211_REASON_MIC_FAILURE); 2190 } 2191 return; 2192 } 2193 if (algo == IEEE80211_AUTH_ALG_SHARED) 2194 ieee80211_auth_shared(ic, wh, frm + 6, efrm, ni, rssi, 2195 rstamp, seq, status); 2196 else if (algo == IEEE80211_AUTH_ALG_OPEN) 2197 ieee80211_auth_open(ic, wh, ni, rssi, rstamp, seq, 2198 status); 2199 else { 2200 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 2201 wh, "auth", "unsupported alg %d", algo); 2202 ic->ic_stats.is_rx_auth_unsupported++; 2203 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 2204 /* XXX not right */ 2205 IEEE80211_SEND_MGMT(ic, ni, 2206 IEEE80211_FC0_SUBTYPE_AUTH, 2207 (seq+1) | (IEEE80211_STATUS_ALG<<16)); 2208 } 2209 return; 2210 } 2211 break; 2212 } 2213 2214 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2215 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 2216 u_int16_t capinfo, lintval; 2217 struct ieee80211_rsnparms rsn; 2218 u_int8_t reason; 2219 2220 if (ic->ic_opmode != IEEE80211_M_HOSTAP || 2221 ic->ic_state != IEEE80211_S_RUN) { 2222 ic->ic_stats.is_rx_mgtdiscard++; 2223 return; 2224 } 2225 2226 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2227 reassoc = 1; 2228 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 2229 } else { 2230 reassoc = 0; 2231 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 2232 } 2233 /* 2234 * asreq frame format 2235 * [2] capability information 2236 * [2] listen interval 2237 * [6*] current AP address (reassoc only) 2238 * [tlv] ssid 2239 * [tlv] supported rates 2240 * [tlv] extended supported rates 2241 * [tlv] WPA or RSN 2242 */ 2243 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4)); 2244 if (!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid)) { 2245 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 2246 wh, ieee80211_mgt_subtype_name[subtype >> 2247 IEEE80211_FC0_SUBTYPE_SHIFT], 2248 "%s", "wrong bssid"); 2249 ic->ic_stats.is_rx_assoc_bss++; 2250 return; 2251 } 2252 capinfo = le16toh(*(u_int16_t *)frm); frm += 2; 2253 lintval = le16toh(*(u_int16_t *)frm); frm += 2; 2254 if (reassoc) 2255 frm += 6; /* ignore current AP info */ 2256 ssid = rates = xrates = wpa = wme = NULL; 2257 while (efrm - frm > 1) { 2258 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2); 2259 switch (*frm) { 2260 case IEEE80211_ELEMID_SSID: 2261 ssid = frm; 2262 break; 2263 case IEEE80211_ELEMID_RATES: 2264 rates = frm; 2265 break; 2266 case IEEE80211_ELEMID_XRATES: 2267 xrates = frm; 2268 break; 2269 /* XXX verify only one of RSN and WPA ie's? */ 2270 case IEEE80211_ELEMID_RSN: 2271 wpa = frm; 2272 break; 2273 case IEEE80211_ELEMID_VENDOR: 2274 if (iswpaoui(frm)) 2275 wpa = frm; 2276 else if (iswmeinfo(frm)) 2277 wme = frm; 2278 /* XXX Atheros OUI support */ 2279 break; 2280 } 2281 frm += frm[1] + 2; 2282 } 2283 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 2284 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); 2285 IEEE80211_VERIFY_SSID(ic->ic_bss, ssid); 2286 2287 if (ni == ic->ic_bss) { 2288 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 2289 "[%s] deny %s request, sta not authenticated\n", 2290 ether_sprintf(wh->i_addr2), 2291 reassoc ? "reassoc" : "assoc"); 2292 ieee80211_send_error(ic, ni, wh->i_addr2, 2293 IEEE80211_FC0_SUBTYPE_DEAUTH, 2294 IEEE80211_REASON_ASSOC_NOT_AUTHED); 2295 ic->ic_stats.is_rx_assoc_notauth++; 2296 return; 2297 } 2298 /* assert right associstion security credentials */ 2299 if (wpa == NULL && (ic->ic_flags & IEEE80211_F_WPA)) { 2300 IEEE80211_DPRINTF(ic, 2301 IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 2302 "[%s] no WPA/RSN IE in association request\n", 2303 ether_sprintf(wh->i_addr2)); 2304 IEEE80211_SEND_MGMT(ic, ni, 2305 IEEE80211_FC0_SUBTYPE_DEAUTH, 2306 IEEE80211_REASON_RSN_REQUIRED); 2307 ieee80211_node_leave(ic, ni); 2308 /* XXX distinguish WPA/RSN? */ 2309 ic->ic_stats.is_rx_assoc_badwpaie++; 2310 return; 2311 } 2312 if (wpa != NULL) { 2313 /* 2314 * Parse WPA information element. Note that 2315 * we initialize the param block from the node 2316 * state so that information in the IE overrides 2317 * our defaults. The resulting parameters are 2318 * installed below after the association is assured. 2319 */ 2320 rsn = ni->ni_rsn; 2321 if (wpa[0] != IEEE80211_ELEMID_RSN) 2322 reason = ieee80211_parse_wpa(ic, wpa, &rsn, wh); 2323 else 2324 reason = ieee80211_parse_rsn(ic, wpa, &rsn, wh); 2325 if (reason != 0) { 2326 IEEE80211_SEND_MGMT(ic, ni, 2327 IEEE80211_FC0_SUBTYPE_DEAUTH, reason); 2328 ieee80211_node_leave(ic, ni); 2329 /* XXX distinguish WPA/RSN? */ 2330 ic->ic_stats.is_rx_assoc_badwpaie++; 2331 return; 2332 } 2333 IEEE80211_DPRINTF(ic, 2334 IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 2335 "[%s] %s ie: mc %u/%u uc %u/%u key %u caps 0x%x\n", 2336 ether_sprintf(wh->i_addr2), 2337 wpa[0] != IEEE80211_ELEMID_RSN ? "WPA" : "RSN", 2338 rsn.rsn_mcastcipher, rsn.rsn_mcastkeylen, 2339 rsn.rsn_ucastcipher, rsn.rsn_ucastkeylen, 2340 rsn.rsn_keymgmt, rsn.rsn_caps); 2341 } 2342 /* discard challenge after association */ 2343 if (ni->ni_challenge != NULL) { 2344 FREE(ni->ni_challenge, M_DEVBUF); 2345 ni->ni_challenge = NULL; 2346 } 2347 /* NB: 802.11 spec says to ignore station's privacy bit */ 2348 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2349 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 2350 "[%s] deny %s request, capability mismatch 0x%x\n", 2351 ether_sprintf(wh->i_addr2), 2352 reassoc ? "reassoc" : "assoc", capinfo); 2353 IEEE80211_SEND_MGMT(ic, ni, resp, 2354 IEEE80211_STATUS_CAPINFO); 2355 ieee80211_node_leave(ic, ni); 2356 ic->ic_stats.is_rx_assoc_capmismatch++; 2357 return; 2358 } 2359 rate = ieee80211_setup_rates(ni, rates, xrates, 2360 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2361 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2362 /* 2363 * If constrained to 11g-only stations reject an 2364 * 11b-only station. We cheat a bit here by looking 2365 * at the max negotiated xmit rate and assuming anyone 2366 * with a best rate <24Mb/s is an 11b station. 2367 */ 2368 if ((rate & IEEE80211_RATE_BASIC) || 2369 ((ic->ic_flags & IEEE80211_F_PUREG) && rate < 48)) { 2370 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 2371 "[%s] deny %s request, rate set mismatch\n", 2372 ether_sprintf(wh->i_addr2), 2373 reassoc ? "reassoc" : "assoc"); 2374 IEEE80211_SEND_MGMT(ic, ni, resp, 2375 IEEE80211_STATUS_BASIC_RATE); 2376 ieee80211_node_leave(ic, ni); 2377 ic->ic_stats.is_rx_assoc_norate++; 2378 return; 2379 } 2380 ni->ni_rssi = rssi; 2381 ni->ni_rstamp = rstamp; 2382 ni->ni_intval = lintval; 2383 ni->ni_capinfo = capinfo; 2384 ni->ni_chan = ic->ic_bss->ni_chan; 2385 ni->ni_fhdwell = ic->ic_bss->ni_fhdwell; 2386 ni->ni_fhindex = ic->ic_bss->ni_fhindex; 2387 if (wpa != NULL) { 2388 /* 2389 * Record WPA/RSN parameters for station, mark 2390 * node as using WPA and record information element 2391 * for applications that require it. 2392 */ 2393 ni->ni_rsn = rsn; 2394 ieee80211_saveie(&ni->ni_wpa_ie, wpa); 2395 } else if (ni->ni_wpa_ie != NULL) { 2396 /* 2397 * Flush any state from a previous association. 2398 */ 2399 FREE(ni->ni_wpa_ie, M_DEVBUF); 2400 ni->ni_wpa_ie = NULL; 2401 } 2402 if (wme != NULL) { 2403 /* 2404 * Record WME parameters for station, mark node 2405 * as capable of QoS and record information 2406 * element for applications that require it. 2407 */ 2408 ieee80211_saveie(&ni->ni_wme_ie, wme); 2409 ni->ni_flags |= IEEE80211_NODE_QOS; 2410 } else if (ni->ni_wme_ie != NULL) { 2411 /* 2412 * Flush any state from a previous association. 2413 */ 2414 FREE(ni->ni_wme_ie, M_DEVBUF); 2415 ni->ni_wme_ie = NULL; 2416 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2417 } 2418 ieee80211_deliver_l2uf(ni); 2419 ieee80211_node_join(ic, ni, resp); 2420 break; 2421 } 2422 2423 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2424 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 2425 u_int16_t capinfo, associd; 2426 u_int16_t status; 2427 2428 if (ic->ic_opmode != IEEE80211_M_STA || 2429 ic->ic_state != IEEE80211_S_ASSOC) { 2430 ic->ic_stats.is_rx_mgtdiscard++; 2431 return; 2432 } 2433 2434 /* 2435 * asresp frame format 2436 * [2] capability information 2437 * [2] status 2438 * [2] association ID 2439 * [tlv] supported rates 2440 * [tlv] extended supported rates 2441 * [tlv] WME 2442 */ 2443 IEEE80211_VERIFY_LENGTH(efrm - frm, 6); 2444 ni = ic->ic_bss; 2445 capinfo = le16toh(*(u_int16_t *)frm); 2446 frm += 2; 2447 status = le16toh(*(u_int16_t *)frm); 2448 frm += 2; 2449 if (status != 0) { 2450 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2451 "[%s] %sassoc failed (reason %d)\n", 2452 ether_sprintf(wh->i_addr2), 2453 ISREASSOC(subtype) ? "re" : "", status); 2454 if (ni != ic->ic_bss) /* XXX never true? */ 2455 ni->ni_fails++; 2456 ic->ic_stats.is_rx_auth_fail++; /* XXX */ 2457 return; 2458 } 2459 associd = le16toh(*(u_int16_t *)frm); 2460 frm += 2; 2461 2462 rates = xrates = wpa = wme = NULL; 2463 while (efrm - frm > 1) { 2464 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2); 2465 switch (*frm) { 2466 case IEEE80211_ELEMID_RATES: 2467 rates = frm; 2468 break; 2469 case IEEE80211_ELEMID_XRATES: 2470 xrates = frm; 2471 break; 2472 case IEEE80211_ELEMID_VENDOR: 2473 if (iswmeoui(frm)) 2474 wme = frm; 2475 /* XXX Atheros OUI support */ 2476 break; 2477 } 2478 frm += frm[1] + 2; 2479 } 2480 2481 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 2482 rate = ieee80211_setup_rates(ni, rates, xrates, 2483 IEEE80211_F_JOIN | 2484 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2485 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2486 if (rate & IEEE80211_RATE_BASIC) { 2487 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2488 "[%s] %sassoc failed (rate set mismatch)\n", 2489 ether_sprintf(wh->i_addr2), 2490 ISREASSOC(subtype) ? "re" : ""); 2491 if (ni != ic->ic_bss) /* XXX never true? */ 2492 ni->ni_fails++; 2493 ic->ic_stats.is_rx_assoc_norate++; 2494 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 2495 return; 2496 } 2497 2498 ni->ni_capinfo = capinfo; 2499 ni->ni_associd = associd; 2500 if (wme != NULL && 2501 ieee80211_parse_wmeparams(ic, wme, wh) >= 0) { 2502 ni->ni_flags |= IEEE80211_NODE_QOS; 2503 ieee80211_wme_updateparams(ic); 2504 } else 2505 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2506 /* 2507 * Configure state now that we are associated. 2508 * 2509 * XXX may need different/additional driver callbacks? 2510 */ 2511 if (ic->ic_curmode == IEEE80211_MODE_11A || 2512 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 2513 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 2514 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 2515 } else { 2516 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 2517 ic->ic_flags |= IEEE80211_F_USEBARKER; 2518 } 2519 ieee80211_set_shortslottime(ic, 2520 ic->ic_curmode == IEEE80211_MODE_11A || 2521 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 2522 /* 2523 * Honor ERP protection. 2524 * 2525 * NB: ni_erp should zero for non-11g operation. 2526 * XXX check ic_curmode anyway? 2527 */ 2528 if (ic->ic_curmode == IEEE80211_MODE_11G && 2529 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 2530 ic->ic_flags |= IEEE80211_F_USEPROT; 2531 else 2532 ic->ic_flags &= ~IEEE80211_F_USEPROT; 2533 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2534 "[%s] %sassoc success: %s preamble, %s slot time%s%s\n", 2535 ether_sprintf(wh->i_addr2), 2536 ISREASSOC(subtype) ? "re" : "", 2537 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 2538 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 2539 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 2540 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "" 2541 ); 2542 ieee80211_new_state(ic, IEEE80211_S_RUN, subtype); 2543 break; 2544 } 2545 2546 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 2547 u_int16_t reason; 2548 2549 if (ic->ic_state == IEEE80211_S_SCAN) { 2550 ic->ic_stats.is_rx_mgtdiscard++; 2551 return; 2552 } 2553 /* 2554 * deauth frame format 2555 * [2] reason 2556 */ 2557 IEEE80211_VERIFY_LENGTH(efrm - frm, 2); 2558 reason = le16toh(*(u_int16_t *)frm); 2559 ic->ic_stats.is_rx_deauth++; 2560 IEEE80211_NODE_STAT(ni, rx_deauth); 2561 2562 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 2563 "[%s] recv deauthenticate (reason %d)\n", 2564 ether_sprintf(ni->ni_macaddr), reason); 2565 switch (ic->ic_opmode) { 2566 case IEEE80211_M_STA: 2567 ieee80211_new_state(ic, IEEE80211_S_AUTH, 2568 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 2569 break; 2570 case IEEE80211_M_HOSTAP: 2571 if (ni != ic->ic_bss) 2572 ieee80211_node_leave(ic, ni); 2573 break; 2574 default: 2575 ic->ic_stats.is_rx_mgtdiscard++; 2576 break; 2577 } 2578 break; 2579 } 2580 2581 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2582 u_int16_t reason; 2583 2584 if (ic->ic_state != IEEE80211_S_RUN && 2585 ic->ic_state != IEEE80211_S_ASSOC && 2586 ic->ic_state != IEEE80211_S_AUTH) { 2587 ic->ic_stats.is_rx_mgtdiscard++; 2588 return; 2589 } 2590 /* 2591 * disassoc frame format 2592 * [2] reason 2593 */ 2594 IEEE80211_VERIFY_LENGTH(efrm - frm, 2); 2595 reason = le16toh(*(u_int16_t *)frm); 2596 ic->ic_stats.is_rx_disassoc++; 2597 IEEE80211_NODE_STAT(ni, rx_disassoc); 2598 2599 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2600 "[%s] recv disassociate (reason %d)\n", 2601 ether_sprintf(ni->ni_macaddr), reason); 2602 switch (ic->ic_opmode) { 2603 case IEEE80211_M_STA: 2604 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 2605 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 2606 break; 2607 case IEEE80211_M_HOSTAP: 2608 if (ni != ic->ic_bss) 2609 ieee80211_node_leave(ic, ni); 2610 break; 2611 default: 2612 ic->ic_stats.is_rx_mgtdiscard++; 2613 break; 2614 } 2615 break; 2616 } 2617 default: 2618 IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, 2619 wh, "mgt", "subtype 0x%x not handled", subtype); 2620 ic->ic_stats.is_rx_badsubtype++; 2621 break; 2622 } 2623 #undef ISREASSOC 2624 #undef ISPROBE 2625 } 2626 #undef IEEE80211_VERIFY_LENGTH 2627 #undef IEEE80211_VERIFY_ELEMENT 2628 2629 /* 2630 * Handle station power-save state change. 2631 */ 2632 static void 2633 ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable) 2634 { 2635 struct ieee80211com *ic = ni->ni_ic; 2636 struct mbuf *m, *mhead, *mtail; 2637 int mcount; 2638 2639 if (enable) { 2640 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) 2641 ic->ic_ps_sta++; 2642 ni->ni_flags |= IEEE80211_NODE_PWR_MGT; 2643 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 2644 "[%s] power save mode on, %u sta's in ps mode\n", 2645 ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta); 2646 return; 2647 } 2648 2649 if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) 2650 ic->ic_ps_sta--; 2651 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT; 2652 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 2653 "[%s] power save mode off, %u sta's in ps mode\n", 2654 ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta); 2655 /* XXX if no stations in ps mode, flush mc frames */ 2656 2657 /* 2658 * Flush queued unicast frames. 2659 */ 2660 if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) { 2661 if (ic->ic_set_tim != NULL) 2662 ic->ic_set_tim(ni, 0); /* just in case */ 2663 return; 2664 } 2665 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 2666 "[%s] flush ps queue, %u packets queued\n", 2667 ether_sprintf(ni->ni_macaddr), IEEE80211_NODE_SAVEQ_QLEN(ni)); 2668 /* 2669 * Unload the frames from the ps q but don't send them 2670 * to the driver yet. We do this in two stages to minimize 2671 * locking but also because there's no easy way to preserve 2672 * ordering given the existing ifnet access mechanisms. 2673 * XXX could be optimized 2674 */ 2675 IEEE80211_NODE_SAVEQ_LOCK(ni); 2676 mcount = IEEE80211_NODE_SAVEQ_QLEN(ni); 2677 mhead = mtail = NULL; 2678 for (;;) { 2679 _IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m); 2680 if (m == NULL) 2681 break; 2682 if (mhead == NULL) { 2683 mhead = m; 2684 m->m_nextpkt = NULL; 2685 } else 2686 mtail->m_nextpkt = m; 2687 mtail = m; 2688 } 2689 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 2690 if (mhead != NULL) { 2691 /* XXX need different driver interface */ 2692 /* XXX bypasses q max */ 2693 IF_PREPEND_LIST(&ic->ic_ifp->if_snd, mhead, mtail, mcount); 2694 } 2695 if (ic->ic_set_tim != NULL) 2696 ic->ic_set_tim(ni, 0); 2697 } 2698 2699 /* 2700 * Process a received ps-poll frame. 2701 */ 2702 static void 2703 ieee80211_recv_pspoll(struct ieee80211com *ic, 2704 struct ieee80211_node *ni, struct mbuf *m0) 2705 { 2706 struct ieee80211_frame_min *wh; 2707 struct mbuf *m; 2708 u_int16_t aid; 2709 int qlen; 2710 2711 wh = mtod(m0, struct ieee80211_frame_min *); 2712 if (ni->ni_associd == 0) { 2713 IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2714 (struct ieee80211_frame *) wh, "ps-poll", 2715 "%s", "unassociated station"); 2716 ic->ic_stats.is_ps_unassoc++; 2717 IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2718 IEEE80211_REASON_NOT_ASSOCED); 2719 return; 2720 } 2721 2722 aid = le16toh(*(u_int16_t *)wh->i_dur); 2723 if (aid != ni->ni_associd) { 2724 IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2725 (struct ieee80211_frame *) wh, "ps-poll", 2726 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2727 ni->ni_associd, aid); 2728 ic->ic_stats.is_ps_badaid++; 2729 IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2730 IEEE80211_REASON_NOT_ASSOCED); 2731 return; 2732 } 2733 2734 /* Okay, take the first queued packet and put it out... */ 2735 IEEE80211_NODE_SAVEQ_DEQUEUE(ni, m, qlen); 2736 if (m == NULL) { 2737 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 2738 "[%s] recv ps-poll, but queue empty\n", 2739 ether_sprintf(wh->i_addr2)); 2740 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2741 ic->ic_stats.is_ps_qempty++; /* XXX node stat */ 2742 if (ic->ic_set_tim != NULL) 2743 ic->ic_set_tim(ni, 0); /* just in case */ 2744 return; 2745 } 2746 /* 2747 * If there are more packets, set the more packets bit 2748 * in the packet dispatched to the station; otherwise 2749 * turn off the TIM bit. 2750 */ 2751 if (qlen != 0) { 2752 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 2753 "[%s] recv ps-poll, send packet, %u still queued\n", 2754 ether_sprintf(ni->ni_macaddr), qlen); 2755 m->m_flags |= M_MORE_DATA; 2756 } else { 2757 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 2758 "[%s] recv ps-poll, send packet, queue empty\n", 2759 ether_sprintf(ni->ni_macaddr)); 2760 if (ic->ic_set_tim != NULL) 2761 ic->ic_set_tim(ni, 0); 2762 } 2763 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2764 IF_ENQUEUE(&ic->ic_ifp->if_snd, m); 2765 } 2766 2767 #ifdef IEEE80211_DEBUG 2768 /* 2769 * Debugging support. 2770 */ 2771 2772 /* 2773 * Return the bssid of a frame. 2774 */ 2775 static const u_int8_t * 2776 ieee80211_getbssid(struct ieee80211com *ic, const struct ieee80211_frame *wh) 2777 { 2778 if (ic->ic_opmode == IEEE80211_M_STA) 2779 return wh->i_addr2; 2780 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 2781 return wh->i_addr1; 2782 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 2783 return wh->i_addr1; 2784 return wh->i_addr3; 2785 } 2786 2787 void 2788 ieee80211_note(struct ieee80211com *ic, const char *fmt, ...) 2789 { 2790 char buf[128]; /* XXX */ 2791 va_list ap; 2792 2793 va_start(ap, fmt); 2794 vsnprintf(buf, sizeof(buf), fmt, ap); 2795 va_end(ap); 2796 2797 if_printf(ic->ic_ifp, "%s", buf); /* NB: no \n */ 2798 } 2799 2800 void 2801 ieee80211_note_frame(struct ieee80211com *ic, 2802 const struct ieee80211_frame *wh, 2803 const char *fmt, ...) 2804 { 2805 char buf[128]; /* XXX */ 2806 va_list ap; 2807 2808 va_start(ap, fmt); 2809 vsnprintf(buf, sizeof(buf), fmt, ap); 2810 va_end(ap); 2811 if_printf(ic->ic_ifp, "[%s] %s\n", 2812 ether_sprintf(ieee80211_getbssid(ic, wh)), buf); 2813 } 2814 2815 void 2816 ieee80211_note_mac(struct ieee80211com *ic, 2817 const u_int8_t mac[IEEE80211_ADDR_LEN], 2818 const char *fmt, ...) 2819 { 2820 char buf[128]; /* XXX */ 2821 va_list ap; 2822 2823 va_start(ap, fmt); 2824 vsnprintf(buf, sizeof(buf), fmt, ap); 2825 va_end(ap); 2826 if_printf(ic->ic_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 2827 } 2828 2829 static void 2830 ieee80211_discard_frame(struct ieee80211com *ic, 2831 const struct ieee80211_frame *wh, 2832 const char *type, const char *fmt, ...) 2833 { 2834 va_list ap; 2835 2836 printf("[%s:%s] discard ", ic->ic_ifp->if_xname, 2837 ether_sprintf(ieee80211_getbssid(ic, wh))); 2838 if (type != NULL) 2839 printf("%s frame, ", type); 2840 else 2841 printf("frame, "); 2842 va_start(ap, fmt); 2843 vprintf(fmt, ap); 2844 va_end(ap); 2845 printf("\n"); 2846 } 2847 2848 static void 2849 ieee80211_discard_ie(struct ieee80211com *ic, 2850 const struct ieee80211_frame *wh, 2851 const char *type, const char *fmt, ...) 2852 { 2853 va_list ap; 2854 2855 printf("[%s:%s] discard ", ic->ic_ifp->if_xname, 2856 ether_sprintf(ieee80211_getbssid(ic, wh))); 2857 if (type != NULL) 2858 printf("%s information element, ", type); 2859 else 2860 printf("information element, "); 2861 va_start(ap, fmt); 2862 vprintf(fmt, ap); 2863 va_end(ap); 2864 printf("\n"); 2865 } 2866 2867 static void 2868 ieee80211_discard_mac(struct ieee80211com *ic, 2869 const u_int8_t mac[IEEE80211_ADDR_LEN], 2870 const char *type, const char *fmt, ...) 2871 { 2872 va_list ap; 2873 2874 printf("[%s:%s] discard ", ic->ic_ifp->if_xname, ether_sprintf(mac)); 2875 if (type != NULL) 2876 printf("%s frame, ", type); 2877 else 2878 printf("frame, "); 2879 va_start(ap, fmt); 2880 vprintf(fmt, ap); 2881 va_end(ap); 2882 printf("\n"); 2883 } 2884 #endif /* IEEE80211_DEBUG */ 2885