1 /* $OpenBSD: ieee80211_input.c,v 1.106 2008/09/27 15:16:09 damien Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 Atsushi Onoe 5 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 6 * Copyright (c) 2007, 2008 Damien Bergamini 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include "bpfilter.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/mbuf.h> 37 #include <sys/malloc.h> 38 #include <sys/kernel.h> 39 #include <sys/socket.h> 40 #include <sys/sockio.h> 41 #include <sys/endian.h> 42 #include <sys/errno.h> 43 #include <sys/proc.h> 44 #include <sys/sysctl.h> 45 #include <sys/endian.h> 46 47 #include <net/if.h> 48 #include <net/if_dl.h> 49 #include <net/if_media.h> 50 #include <net/if_arp.h> 51 #include <net/if_llc.h> 52 53 #if NBPFILTER > 0 54 #include <net/bpf.h> 55 #endif 56 57 #ifdef INET 58 #include <netinet/in.h> 59 #include <netinet/if_ether.h> 60 #endif 61 62 #include <net80211/ieee80211_var.h> 63 #include <net80211/ieee80211_priv.h> 64 65 void ieee80211_deliver_data(struct ieee80211com *, struct mbuf *, 66 struct ieee80211_node *); 67 int ieee80211_parse_edca_params_body(struct ieee80211com *, 68 const u_int8_t *); 69 int ieee80211_parse_edca_params(struct ieee80211com *, const u_int8_t *); 70 int ieee80211_parse_wmm_params(struct ieee80211com *, const u_int8_t *); 71 enum ieee80211_cipher ieee80211_parse_rsn_cipher(const u_int8_t[]); 72 enum ieee80211_akm ieee80211_parse_rsn_akm(const u_int8_t[]); 73 int ieee80211_parse_rsn_body(struct ieee80211com *, const u_int8_t *, 74 u_int, struct ieee80211_rsnparams *); 75 int ieee80211_save_ie(const u_int8_t *, u_int8_t **); 76 #ifndef IEEE80211_STA_ONLY 77 void ieee80211_recv_pspoll(struct ieee80211com *, struct mbuf *, 78 struct ieee80211_node *); 79 #endif 80 void ieee80211_recv_probe_resp(struct ieee80211com *, struct mbuf *, 81 struct ieee80211_node *, struct ieee80211_rxinfo *, int); 82 #ifndef IEEE80211_STA_ONLY 83 void ieee80211_recv_probe_req(struct ieee80211com *, struct mbuf *, 84 struct ieee80211_node *, struct ieee80211_rxinfo *); 85 #endif 86 void ieee80211_recv_auth(struct ieee80211com *, struct mbuf *, 87 struct ieee80211_node *, struct ieee80211_rxinfo *); 88 #ifndef IEEE80211_STA_ONLY 89 void ieee80211_recv_assoc_req(struct ieee80211com *, struct mbuf *, 90 struct ieee80211_node *, struct ieee80211_rxinfo *, int); 91 #endif 92 void ieee80211_recv_assoc_resp(struct ieee80211com *, struct mbuf *, 93 struct ieee80211_node *, int); 94 void ieee80211_recv_deauth(struct ieee80211com *, struct mbuf *, 95 struct ieee80211_node *); 96 void ieee80211_recv_disassoc(struct ieee80211com *, struct mbuf *, 97 struct ieee80211_node *); 98 void ieee80211_recv_action(struct ieee80211com *, struct mbuf *, 99 struct ieee80211_node *); 100 101 /* 102 * Retrieve the length in bytes of a 802.11 header. 103 */ 104 u_int 105 ieee80211_get_hdrlen(const struct ieee80211_frame *wh) 106 { 107 u_int size = sizeof(*wh); 108 109 /* NB: does not work with control frames */ 110 KASSERT(ieee80211_has_seq(wh)); 111 112 if (ieee80211_has_addr4(wh)) 113 size += IEEE80211_ADDR_LEN; /* i_addr4 */ 114 if (ieee80211_has_qos(wh)) 115 size += sizeof(u_int16_t); /* i_qos */ 116 if (ieee80211_has_htc(wh)) 117 size += sizeof(u_int32_t); /* i_ht */ 118 return size; 119 } 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 void 132 ieee80211_input(struct ifnet *ifp, struct mbuf *m, struct ieee80211_node *ni, 133 struct ieee80211_rxinfo *rxi) 134 { 135 struct ieee80211com *ic = (void *)ifp; 136 struct ieee80211_frame *wh; 137 u_int16_t *orxseq, nrxseq; 138 u_int8_t dir, type, subtype, tid; 139 int hdrlen; 140 141 #ifdef DIAGNOSTIC 142 if (ni == NULL) 143 panic("null node"); 144 #endif 145 /* in monitor mode, send everything directly to bpf */ 146 if (ic->ic_opmode == IEEE80211_M_MONITOR) 147 goto out; 148 149 /* 150 * Do not process frames without an Address 2 field any further. 151 * Only CTS and ACK control frames do not have this field. 152 */ 153 if (m->m_len < sizeof(struct ieee80211_frame_min)) { 154 DPRINTF(("frame too short, len %u\n", m->m_len)); 155 ic->ic_stats.is_rx_tooshort++; 156 goto out; 157 } 158 159 wh = mtod(m, struct ieee80211_frame *); 160 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 161 IEEE80211_FC0_VERSION_0) { 162 DPRINTF(("frame with wrong version: %x\n", wh->i_fc[0])); 163 ic->ic_stats.is_rx_badversion++; 164 goto err; 165 } 166 167 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 168 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 169 170 if (type != IEEE80211_FC0_TYPE_CTL) { 171 hdrlen = ieee80211_get_hdrlen(wh); 172 if (m->m_len < hdrlen) { 173 DPRINTF(("frame too short, len %u\n", m->m_len)); 174 ic->ic_stats.is_rx_tooshort++; 175 goto err; 176 } 177 } 178 /* check and save sequence control field, if present */ 179 if (ieee80211_has_seq(wh) && 180 ic->ic_state != IEEE80211_S_SCAN) { 181 nrxseq = letoh16(*(u_int16_t *)wh->i_seq) >> 182 IEEE80211_SEQ_SEQ_SHIFT; 183 if (ieee80211_has_qos(wh)) { 184 tid = ieee80211_get_qos(wh) & IEEE80211_QOS_TID; 185 orxseq = &ni->ni_qos_rxseqs[tid]; 186 } else 187 orxseq = &ni->ni_rxseq; 188 if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) && 189 nrxseq == *orxseq) { 190 /* duplicate, silently discarded */ 191 ic->ic_stats.is_rx_dup++; 192 goto out; 193 } 194 *orxseq = nrxseq; 195 } 196 if (ic->ic_state != IEEE80211_S_SCAN) { 197 ni->ni_rssi = rxi->rxi_rssi; 198 ni->ni_rstamp = rxi->rxi_tstamp; 199 ni->ni_inact = 0; 200 } 201 202 #ifndef IEEE80211_STA_ONLY 203 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 204 (ic->ic_caps & IEEE80211_C_APPMGT) && 205 ni->ni_state == IEEE80211_STA_ASSOC) { 206 if (wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) { 207 if (ni->ni_pwrsave == IEEE80211_PS_AWAKE) { 208 /* turn on PS mode */ 209 ni->ni_pwrsave = IEEE80211_PS_DOZE; 210 ic->ic_pssta++; 211 DPRINTF(("PS mode on for %s, count %d\n", 212 ether_sprintf(wh->i_addr2), ic->ic_pssta)); 213 } 214 } else if (ni->ni_pwrsave == IEEE80211_PS_DOZE) { 215 /* turn off PS mode */ 216 ni->ni_pwrsave = IEEE80211_PS_AWAKE; 217 ic->ic_pssta--; 218 DPRINTF(("PS mode off for %s, count %d\n", 219 ether_sprintf(wh->i_addr2), ic->ic_pssta)); 220 221 (*ic->ic_set_tim)(ic, ni->ni_associd, 0); 222 223 /* dequeue buffered unicast frames */ 224 while (!IF_IS_EMPTY(&ni->ni_savedq)) { 225 struct mbuf *m; 226 IF_DEQUEUE(&ni->ni_savedq, m); 227 IF_ENQUEUE(&ic->ic_pwrsaveq, m); 228 (*ifp->if_start)(ifp); 229 } 230 } 231 } 232 #endif 233 switch (type) { 234 case IEEE80211_FC0_TYPE_DATA: 235 switch (ic->ic_opmode) { 236 case IEEE80211_M_STA: 237 if (dir != IEEE80211_FC1_DIR_FROMDS) { 238 ic->ic_stats.is_rx_wrongdir++; 239 goto out; 240 } 241 if (ic->ic_state != IEEE80211_S_SCAN && 242 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid)) { 243 /* Source address is not our BSS. */ 244 DPRINTF(("discard frame from SA %s\n", 245 ether_sprintf(wh->i_addr2))); 246 ic->ic_stats.is_rx_wrongbss++; 247 goto out; 248 } 249 if ((ifp->if_flags & IFF_SIMPLEX) && 250 IEEE80211_IS_MULTICAST(wh->i_addr1) && 251 IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_myaddr)) { 252 /* 253 * In IEEE802.11 network, multicast frame 254 * sent from me is broadcasted from AP. 255 * It should be silently discarded for 256 * SIMPLEX interface. 257 */ 258 ic->ic_stats.is_rx_mcastecho++; 259 goto out; 260 } 261 break; 262 #ifndef IEEE80211_STA_ONLY 263 case IEEE80211_M_IBSS: 264 case IEEE80211_M_AHDEMO: 265 if (dir != IEEE80211_FC1_DIR_NODS) { 266 ic->ic_stats.is_rx_wrongdir++; 267 goto out; 268 } 269 if (ic->ic_state != IEEE80211_S_SCAN && 270 !IEEE80211_ADDR_EQ(wh->i_addr3, 271 ic->ic_bss->ni_bssid) && 272 !IEEE80211_ADDR_EQ(wh->i_addr3, 273 etherbroadcastaddr)) { 274 /* Destination is not our BSS or broadcast. */ 275 DPRINTF(("discard data frame to DA %s\n", 276 ether_sprintf(wh->i_addr3))); 277 ic->ic_stats.is_rx_wrongbss++; 278 goto out; 279 } 280 break; 281 case IEEE80211_M_HOSTAP: 282 if (dir != IEEE80211_FC1_DIR_TODS) { 283 ic->ic_stats.is_rx_wrongdir++; 284 goto out; 285 } 286 if (ic->ic_state != IEEE80211_S_SCAN && 287 !IEEE80211_ADDR_EQ(wh->i_addr1, 288 ic->ic_bss->ni_bssid) && 289 !IEEE80211_ADDR_EQ(wh->i_addr1, 290 etherbroadcastaddr)) { 291 /* BSS is not us or broadcast. */ 292 DPRINTF(("discard data frame to BSS %s\n", 293 ether_sprintf(wh->i_addr1))); 294 ic->ic_stats.is_rx_wrongbss++; 295 goto out; 296 } 297 /* check if source STA is associated */ 298 if (ni == ic->ic_bss) { 299 DPRINTF(("data from unknown src %s\n", 300 ether_sprintf(wh->i_addr2))); 301 /* NB: caller deals with reference */ 302 ni = ieee80211_dup_bss(ic, wh->i_addr2); 303 if (ni != NULL) { 304 IEEE80211_SEND_MGMT(ic, ni, 305 IEEE80211_FC0_SUBTYPE_DEAUTH, 306 IEEE80211_REASON_NOT_AUTHED); 307 } 308 ic->ic_stats.is_rx_notassoc++; 309 goto err; 310 } 311 if (ni->ni_associd == 0) { 312 DPRINTF(("data from unassoc src %s\n", 313 ether_sprintf(wh->i_addr2))); 314 IEEE80211_SEND_MGMT(ic, ni, 315 IEEE80211_FC0_SUBTYPE_DISASSOC, 316 IEEE80211_REASON_NOT_ASSOCED); 317 ic->ic_stats.is_rx_notassoc++; 318 goto err; 319 } 320 break; 321 #endif /* IEEE80211_STA_ONLY */ 322 default: 323 /* can't get there */ 324 goto out; 325 } 326 327 if ((ic->ic_flags & IEEE80211_F_WEPON) || 328 ((ic->ic_flags & IEEE80211_F_RSNON) && 329 (ni->ni_flags & IEEE80211_NODE_RXPROT))) { 330 /* protection is on for Rx */ 331 if (!(rxi->rxi_flags & IEEE80211_RXI_HWDEC)) { 332 if (!(wh->i_fc[1] & IEEE80211_FC1_PROTECTED)) { 333 /* drop unencrypted */ 334 ic->ic_stats.is_rx_unencrypted++; 335 goto err; 336 } 337 /* do software decryption */ 338 m = ieee80211_decrypt(ic, m, ni); 339 if (m == NULL) { 340 ic->ic_stats.is_rx_wepfail++; 341 goto err; 342 } 343 wh = mtod(m, struct ieee80211_frame *); 344 } 345 } else if ((wh->i_fc[1] & IEEE80211_FC1_PROTECTED) || 346 (rxi->rxi_flags & IEEE80211_RXI_HWDEC)) { 347 /* frame encrypted but protection off for Rx */ 348 ic->ic_stats.is_rx_nowep++; 349 goto out; 350 } 351 352 #if NBPFILTER > 0 353 /* copy to listener after decrypt */ 354 if (ic->ic_rawbpf) 355 bpf_mtap(ic->ic_rawbpf, m, BPF_DIRECTION_IN); 356 #endif 357 m = ieee80211_decap(ifp, m, hdrlen); 358 if (m == NULL) { 359 DPRINTF(("decapsulation error for src %s\n", 360 ether_sprintf(wh->i_addr2))); 361 ic->ic_stats.is_rx_decap++; 362 goto err; 363 } 364 ieee80211_deliver_data(ic, m, ni); 365 return; 366 367 case IEEE80211_FC0_TYPE_MGT: 368 if (dir != IEEE80211_FC1_DIR_NODS) { 369 ic->ic_stats.is_rx_wrongdir++; 370 goto err; 371 } 372 #ifndef IEEE80211_STA_ONLY 373 if (ic->ic_opmode == IEEE80211_M_AHDEMO) { 374 ic->ic_stats.is_rx_ahdemo_mgt++; 375 goto out; 376 } 377 #endif 378 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 379 380 /* drop frames without interest */ 381 if (ic->ic_state == IEEE80211_S_SCAN) { 382 if (subtype != IEEE80211_FC0_SUBTYPE_BEACON && 383 subtype != IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 384 ic->ic_stats.is_rx_mgtdiscard++; 385 goto out; 386 } 387 } 388 389 if (ni->ni_flags & IEEE80211_NODE_RXMGMTPROT) { 390 /* MMPDU protection is on for Rx */ 391 if (subtype == IEEE80211_FC0_SUBTYPE_DISASSOC || 392 subtype == IEEE80211_FC0_SUBTYPE_DEAUTH || 393 subtype == IEEE80211_FC0_SUBTYPE_ACTION) { 394 if (!IEEE80211_IS_MULTICAST(wh->i_addr1) && 395 !(wh->i_fc[1] & IEEE80211_FC1_PROTECTED)) { 396 /* unicast mgmt not encrypted */ 397 goto out; 398 } 399 /* do software decryption */ 400 m = ieee80211_decrypt(ic, m, ni); 401 if (m == NULL) { 402 /* XXX stats */ 403 goto out; 404 } 405 wh = mtod(m, struct ieee80211_frame *); 406 } 407 } else if ((ic->ic_flags & IEEE80211_F_RSNON) && 408 (wh->i_fc[1] & IEEE80211_FC1_PROTECTED)) { 409 /* encrypted but MMPDU Rx protection off for TA */ 410 goto out; 411 } 412 413 if (ifp->if_flags & IFF_DEBUG) { 414 /* avoid to print too many frames */ 415 int doprint = 0; 416 417 switch (subtype) { 418 case IEEE80211_FC0_SUBTYPE_BEACON: 419 if (ic->ic_state == IEEE80211_S_SCAN) 420 doprint = 1; 421 break; 422 #ifndef IEEE80211_STA_ONLY 423 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 424 if (ic->ic_opmode == IEEE80211_M_IBSS) 425 doprint = 1; 426 break; 427 #endif 428 default: 429 doprint = 1; 430 break; 431 } 432 #ifdef IEEE80211_DEBUG 433 doprint += ieee80211_debug; 434 #endif 435 if (doprint) 436 printf("%s: received %s from %s rssi %d mode %s\n", 437 ifp->if_xname, 438 ieee80211_mgt_subtype_name[subtype 439 >> IEEE80211_FC0_SUBTYPE_SHIFT], 440 ether_sprintf(wh->i_addr2), rxi->rxi_rssi, 441 ieee80211_phymode_name[ieee80211_chan2mode(ic, 442 ic->ic_bss->ni_chan)]); 443 } 444 #if NBPFILTER > 0 445 if (ic->ic_rawbpf) 446 bpf_mtap(ic->ic_rawbpf, m, BPF_DIRECTION_IN); 447 /* 448 * Drop mbuf if it was filtered by bpf. Normally, this is 449 * done in ether_input() but IEEE 802.11 management frames 450 * are a special case. 451 */ 452 if (m->m_flags & M_FILDROP) { 453 m_freem(m); 454 return; 455 } 456 #endif 457 (*ic->ic_recv_mgmt)(ic, m, ni, rxi, subtype); 458 m_freem(m); 459 return; 460 461 case IEEE80211_FC0_TYPE_CTL: 462 ic->ic_stats.is_rx_ctl++; 463 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 464 switch (subtype) { 465 #ifndef IEEE80211_STA_ONLY 466 case IEEE80211_FC0_SUBTYPE_PS_POLL: 467 ieee80211_recv_pspoll(ic, m, ni); 468 break; 469 #endif 470 case IEEE80211_FC0_SUBTYPE_BAR: 471 /* NYI */ 472 break; 473 case IEEE80211_FC0_SUBTYPE_BA: 474 /* NYI */ 475 break; 476 } 477 goto out; 478 479 default: 480 DPRINTF(("bad frame type %x\n", type)); 481 /* should not come here */ 482 break; 483 } 484 err: 485 ifp->if_ierrors++; 486 out: 487 if (m != NULL) { 488 #if NBPFILTER > 0 489 if (ic->ic_rawbpf) 490 bpf_mtap(ic->ic_rawbpf, m, BPF_DIRECTION_IN); 491 #endif 492 m_freem(m); 493 } 494 } 495 496 void 497 ieee80211_deliver_data(struct ieee80211com *ic, struct mbuf *m, 498 struct ieee80211_node *ni) 499 { 500 struct ifnet *ifp = &ic->ic_if; 501 struct ether_header *eh; 502 struct mbuf *m1; 503 504 eh = mtod(m, struct ether_header *); 505 506 if ((ic->ic_flags & IEEE80211_F_RSNON) && !ni->ni_port_valid && 507 eh->ether_type != htons(ETHERTYPE_PAE)) { 508 DPRINTF(("port not valid: %s\n", 509 ether_sprintf(eh->ether_dhost))); 510 ic->ic_stats.is_rx_unauth++; 511 m_freem(m); 512 return; 513 } 514 ifp->if_ipackets++; 515 516 /* 517 * Perform as a bridge within the AP. Notice that we do not 518 * bridge EAPOL frames as suggested in C.1.1 of IEEE Std 802.1X. 519 */ 520 m1 = NULL; 521 #ifndef IEEE80211_STA_ONLY 522 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 523 !(ic->ic_flags & IEEE80211_F_NOBRIDGE) && 524 eh->ether_type != htons(ETHERTYPE_PAE)) { 525 struct ieee80211_node *ni1; 526 int error, len; 527 528 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 529 m1 = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 530 if (m1 == NULL) 531 ifp->if_oerrors++; 532 else 533 m1->m_flags |= M_MCAST; 534 } else { 535 ni1 = ieee80211_find_node(ic, eh->ether_dhost); 536 if (ni1 != NULL && 537 ni1->ni_state == IEEE80211_STA_ASSOC) { 538 m1 = m; 539 m = NULL; 540 } 541 } 542 if (m1 != NULL) { 543 len = m1->m_pkthdr.len; 544 IFQ_ENQUEUE(&ifp->if_snd, m1, NULL, error); 545 if (error) 546 ifp->if_oerrors++; 547 else { 548 if (m != NULL) 549 ifp->if_omcasts++; 550 ifp->if_obytes += len; 551 if_start(ifp); 552 } 553 } 554 } 555 #endif 556 if (m != NULL) { 557 #if NBPFILTER > 0 558 /* 559 * If we forward frame into transmitter of the AP, 560 * we don't need to duplicate for DLT_EN10MB. 561 */ 562 if (ifp->if_bpf && m1 == NULL) 563 bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_IN); 564 #endif 565 if ((ic->ic_flags & IEEE80211_F_RSNON) && 566 eh->ether_type == htons(ETHERTYPE_PAE)) 567 ieee80211_eapol_key_input(ic, m, ni); 568 else 569 ether_input_mbuf(ifp, m); 570 } 571 } 572 573 struct mbuf * 574 ieee80211_decap(struct ifnet *ifp, struct mbuf *m, int hdrlen) 575 { 576 struct ieee80211_qosframe_addr4 wh; /* largest 802.11 header */ 577 struct ether_header *eh; 578 struct llc *llc; 579 580 if (m->m_len < hdrlen + LLC_SNAPFRAMELEN) { 581 m = m_pullup(m, hdrlen + LLC_SNAPFRAMELEN); 582 if (m == NULL) 583 return NULL; 584 } 585 memcpy(&wh, mtod(m, caddr_t), hdrlen); 586 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 587 if (llc->llc_dsap == LLC_SNAP_LSAP && 588 llc->llc_ssap == LLC_SNAP_LSAP && 589 llc->llc_control == LLC_UI && 590 llc->llc_snap.org_code[0] == 0 && 591 llc->llc_snap.org_code[1] == 0 && 592 llc->llc_snap.org_code[2] == 0) { 593 m_adj(m, hdrlen + LLC_SNAPFRAMELEN - sizeof(*eh)); 594 llc = NULL; 595 } else { 596 m_adj(m, hdrlen - sizeof(*eh)); 597 } 598 eh = mtod(m, struct ether_header *); 599 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 600 case IEEE80211_FC1_DIR_NODS: 601 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 602 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 603 break; 604 case IEEE80211_FC1_DIR_TODS: 605 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 606 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 607 break; 608 case IEEE80211_FC1_DIR_FROMDS: 609 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 610 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 611 break; 612 case IEEE80211_FC1_DIR_DSTODS: 613 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 614 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 615 break; 616 } 617 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), u_int32_t)) { 618 struct mbuf *n, *n0, **np; 619 caddr_t newdata; 620 int off, pktlen; 621 622 n0 = NULL; 623 np = &n0; 624 off = 0; 625 pktlen = m->m_pkthdr.len; 626 while (pktlen > off) { 627 if (n0 == NULL) { 628 MGETHDR(n, M_DONTWAIT, MT_DATA); 629 if (n == NULL) { 630 m_freem(m); 631 return NULL; 632 } 633 M_DUP_PKTHDR(n, m); 634 n->m_len = MHLEN; 635 } else { 636 MGET(n, M_DONTWAIT, MT_DATA); 637 if (n == NULL) { 638 m_freem(m); 639 m_freem(n0); 640 return NULL; 641 } 642 n->m_len = MLEN; 643 } 644 if (pktlen - off >= MINCLSIZE) { 645 MCLGET(n, M_DONTWAIT); 646 if (n->m_flags & M_EXT) 647 n->m_len = n->m_ext.ext_size; 648 } 649 if (n0 == NULL) { 650 newdata = 651 (caddr_t)ALIGN(n->m_data + sizeof(*eh)) - 652 sizeof(*eh); 653 n->m_len -= newdata - n->m_data; 654 n->m_data = newdata; 655 } 656 if (n->m_len > pktlen - off) 657 n->m_len = pktlen - off; 658 m_copydata(m, off, n->m_len, mtod(n, caddr_t)); 659 off += n->m_len; 660 *np = n; 661 np = &n->m_next; 662 } 663 m_freem(m); 664 m = n0; 665 } 666 if (llc != NULL) { 667 eh = mtod(m, struct ether_header *); 668 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 669 } 670 return m; 671 } 672 673 /* 674 * Parse an EDCA Parameter Set element (see 7.3.2.27). 675 */ 676 int 677 ieee80211_parse_edca_params_body(struct ieee80211com *ic, const u_int8_t *frm) 678 { 679 u_int updtcount; 680 int aci; 681 682 /* 683 * Check if EDCA parameters have changed XXX if we miss more than 684 * 15 consecutive beacons, we might not detect changes to EDCA 685 * parameters due to wraparound of the 4-bit Update Count field. 686 */ 687 updtcount = frm[0] & 0xf; 688 if (updtcount == ic->ic_edca_updtcount) 689 return 0; /* no changes to EDCA parameters, ignore */ 690 ic->ic_edca_updtcount = updtcount; 691 692 frm += 2; /* skip QoS Info & Reserved fields */ 693 694 /* parse AC Parameter Records */ 695 for (aci = 0; aci < EDCA_NUM_AC; aci++) { 696 struct ieee80211_edca_ac_params *ac = &ic->ic_edca_ac[aci]; 697 698 ac->ac_acm = (frm[0] >> 4) & 0x1; 699 ac->ac_aifsn = frm[0] & 0xf; 700 ac->ac_ecwmin = frm[1] & 0xf; 701 ac->ac_ecwmax = frm[1] >> 4; 702 ac->ac_txoplimit = LE_READ_2(frm + 2); 703 frm += 4; 704 } 705 /* give drivers a chance to update their settings */ 706 if ((ic->ic_flags & IEEE80211_F_QOS) && ic->ic_updateedca != NULL) 707 (*ic->ic_updateedca)(ic); 708 709 return 0; 710 } 711 712 int 713 ieee80211_parse_edca_params(struct ieee80211com *ic, const u_int8_t *frm) 714 { 715 if (frm[1] < 18) { 716 ic->ic_stats.is_rx_elem_toosmall++; 717 return IEEE80211_REASON_IE_INVALID; 718 } 719 return ieee80211_parse_edca_params_body(ic, frm + 2); 720 } 721 722 int 723 ieee80211_parse_wmm_params(struct ieee80211com *ic, const u_int8_t *frm) 724 { 725 if (frm[1] < 24) { 726 ic->ic_stats.is_rx_elem_toosmall++; 727 return IEEE80211_REASON_IE_INVALID; 728 } 729 return ieee80211_parse_edca_params_body(ic, frm + 8); 730 } 731 732 enum ieee80211_cipher 733 ieee80211_parse_rsn_cipher(const u_int8_t selector[4]) 734 { 735 if (memcmp(selector, MICROSOFT_OUI, 3) == 0) { /* WPA */ 736 switch (selector[3]) { 737 case 0: /* use group data cipher suite */ 738 return IEEE80211_CIPHER_USEGROUP; 739 case 1: /* WEP-40 */ 740 return IEEE80211_CIPHER_WEP40; 741 case 2: /* TKIP */ 742 return IEEE80211_CIPHER_TKIP; 743 case 4: /* CCMP (RSNA default) */ 744 return IEEE80211_CIPHER_CCMP; 745 case 5: /* WEP-104 */ 746 return IEEE80211_CIPHER_WEP104; 747 } 748 } else if (memcmp(selector, IEEE80211_OUI, 3) == 0) { /* RSN */ 749 /* from IEEE Std 802.11 - Table 20da */ 750 switch (selector[3]) { 751 case 0: /* use group data cipher suite */ 752 return IEEE80211_CIPHER_USEGROUP; 753 case 1: /* WEP-40 */ 754 return IEEE80211_CIPHER_WEP40; 755 case 2: /* TKIP */ 756 return IEEE80211_CIPHER_TKIP; 757 case 4: /* CCMP (RSNA default) */ 758 return IEEE80211_CIPHER_CCMP; 759 case 5: /* WEP-104 */ 760 return IEEE80211_CIPHER_WEP104; 761 case 6: /* AES-128-CMAC */ 762 return IEEE80211_CIPHER_AES128_CMAC; 763 } 764 } 765 return IEEE80211_CIPHER_NONE; /* ignore unknown ciphers */ 766 } 767 768 enum ieee80211_akm 769 ieee80211_parse_rsn_akm(const u_int8_t selector[4]) 770 { 771 if (memcmp(selector, MICROSOFT_OUI, 3) == 0) { /* WPA */ 772 switch (selector[3]) { 773 case 1: /* IEEE 802.1X (RSNA default) */ 774 return IEEE80211_AKM_8021X; 775 case 2: /* PSK */ 776 return IEEE80211_AKM_PSK; 777 } 778 } else if (memcmp(selector, IEEE80211_OUI, 3) == 0) { /* RSN */ 779 /* from IEEE Std 802.11i-2004 - Table 20dc */ 780 switch (selector[3]) { 781 case 1: /* IEEE 802.1X (RSNA default) */ 782 return IEEE80211_AKM_8021X; 783 case 2: /* PSK */ 784 return IEEE80211_AKM_PSK; 785 case 5: /* IEEE 802.1X with SHA256 KDF */ 786 return IEEE80211_AKM_SHA256_8021X; 787 case 6: /* PSK with SHA256 KDF */ 788 return IEEE80211_AKM_SHA256_PSK; 789 } 790 } 791 return IEEE80211_AKM_NONE; /* ignore unknown AKMs */ 792 } 793 794 /* 795 * Parse an RSN element (see 7.3.2.25). 796 */ 797 int 798 ieee80211_parse_rsn_body(struct ieee80211com *ic, const u_int8_t *frm, 799 u_int len, struct ieee80211_rsnparams *rsn) 800 { 801 const u_int8_t *efrm; 802 u_int16_t m, n, s; 803 804 efrm = frm + len; 805 806 /* check Version field */ 807 if (LE_READ_2(frm) != 1) 808 return IEEE80211_STATUS_RSN_IE_VER_UNSUP; 809 frm += 2; 810 811 /* all fields after the Version field are optional */ 812 813 /* if Cipher Suite missing, default to CCMP */ 814 rsn->rsn_groupcipher = IEEE80211_CIPHER_CCMP; 815 rsn->rsn_nciphers = 1; 816 rsn->rsn_ciphers = IEEE80211_CIPHER_CCMP; 817 /* if Group Management Cipher Suite missing, defaut to AES-128-CMAC */ 818 rsn->rsn_groupmgmtcipher = IEEE80211_CIPHER_AES128_CMAC; 819 /* if AKM Suite missing, default to 802.1X */ 820 rsn->rsn_nakms = 1; 821 rsn->rsn_akms = IEEE80211_AKM_8021X; 822 /* if RSN capabilities missing, default to 0 */ 823 rsn->rsn_caps = 0; 824 rsn->rsn_npmkids = 0; 825 826 /* read Group Data Cipher Suite field */ 827 if (frm + 4 > efrm) 828 return 0; 829 rsn->rsn_groupcipher = ieee80211_parse_rsn_cipher(frm); 830 if (rsn->rsn_groupcipher == IEEE80211_CIPHER_USEGROUP) 831 return IEEE80211_STATUS_BAD_GROUP_CIPHER; 832 frm += 4; 833 834 /* read Pairwise Cipher Suite Count field */ 835 if (frm + 2 > efrm) 836 return 0; 837 m = rsn->rsn_nciphers = LE_READ_2(frm); 838 frm += 2; 839 840 /* read Pairwise Cipher Suite List */ 841 if (frm + m * 4 > efrm) 842 return IEEE80211_STATUS_IE_INVALID; 843 rsn->rsn_ciphers = IEEE80211_CIPHER_NONE; 844 while (m-- > 0) { 845 rsn->rsn_ciphers |= ieee80211_parse_rsn_cipher(frm); 846 frm += 4; 847 } 848 if (rsn->rsn_ciphers & IEEE80211_CIPHER_USEGROUP) { 849 if (rsn->rsn_ciphers != IEEE80211_CIPHER_USEGROUP) 850 return IEEE80211_STATUS_BAD_PAIRWISE_CIPHER; 851 if (rsn->rsn_groupcipher == IEEE80211_CIPHER_CCMP) 852 return IEEE80211_STATUS_BAD_PAIRWISE_CIPHER; 853 } 854 855 /* read AKM Suite List Count field */ 856 if (frm + 2 > efrm) 857 return 0; 858 n = rsn->rsn_nakms = LE_READ_2(frm); 859 frm += 2; 860 861 /* read AKM Suite List */ 862 if (frm + n * 4 > efrm) 863 return IEEE80211_STATUS_IE_INVALID; 864 rsn->rsn_akms = IEEE80211_AKM_NONE; 865 while (n-- > 0) { 866 rsn->rsn_akms |= ieee80211_parse_rsn_akm(frm); 867 frm += 4; 868 } 869 870 /* read RSN Capabilities field */ 871 if (frm + 2 > efrm) 872 return 0; 873 rsn->rsn_caps = LE_READ_2(frm); 874 frm += 2; 875 876 /* read PMKID Count field */ 877 if (frm + 2 > efrm) 878 return 0; 879 s = rsn->rsn_npmkids = LE_READ_2(frm); 880 frm += 2; 881 882 /* read PMKID List */ 883 if (frm + s * IEEE80211_PMKID_LEN > efrm) 884 return IEEE80211_STATUS_IE_INVALID; 885 if (s != 0) { 886 rsn->rsn_pmkids = frm; 887 frm += s * IEEE80211_PMKID_LEN; 888 } 889 890 /* read Group Management Cipher Suite field */ 891 if (frm + 4 > efrm) 892 return 0; 893 rsn->rsn_groupmgmtcipher = ieee80211_parse_rsn_cipher(frm); 894 895 return IEEE80211_STATUS_SUCCESS; 896 } 897 898 int 899 ieee80211_parse_rsn(struct ieee80211com *ic, const u_int8_t *frm, 900 struct ieee80211_rsnparams *rsn) 901 { 902 if (frm[1] < 2) { 903 ic->ic_stats.is_rx_elem_toosmall++; 904 return IEEE80211_STATUS_IE_INVALID; 905 } 906 return ieee80211_parse_rsn_body(ic, frm + 2, frm[1], rsn); 907 } 908 909 int 910 ieee80211_parse_wpa(struct ieee80211com *ic, const u_int8_t *frm, 911 struct ieee80211_rsnparams *rsn) 912 { 913 if (frm[1] < 6) { 914 ic->ic_stats.is_rx_elem_toosmall++; 915 return IEEE80211_STATUS_IE_INVALID; 916 } 917 return ieee80211_parse_rsn_body(ic, frm + 6, frm[1] - 4, rsn); 918 } 919 920 /* 921 * Create (or update) a copy of an information element. 922 */ 923 int 924 ieee80211_save_ie(const u_int8_t *frm, u_int8_t **ie) 925 { 926 if (*ie == NULL || (*ie)[1] != frm[1]) { 927 if (*ie != NULL) 928 free(*ie, M_DEVBUF); 929 *ie = malloc(2 + frm[1], M_DEVBUF, M_NOWAIT); 930 if (*ie == NULL) 931 return ENOMEM; 932 } 933 memcpy(*ie, frm, 2 + frm[1]); 934 return 0; 935 } 936 937 /*- 938 * Beacon/Probe response frame format: 939 * [8] Timestamp 940 * [2] Beacon interval 941 * [2] Capability 942 * [tlv] Service Set Identifier (SSID) 943 * [tlv] Supported rates 944 * [tlv*] DS Parameter Set (802.11g) 945 * [tlv] ERP Information (802.11g) 946 * [tlv] Extended Supported Rates (802.11g) 947 * [tlv] RSN (802.11i) 948 * [tlv] EDCA Parameter Set (802.11e) 949 * [tlv] QoS Capability (Beacon only, 802.11e) 950 */ 951 void 952 ieee80211_recv_probe_resp(struct ieee80211com *ic, struct mbuf *m0, 953 struct ieee80211_node *ni, struct ieee80211_rxinfo *rxi, int isprobe) 954 { 955 const struct ieee80211_frame *wh; 956 const u_int8_t *frm, *efrm; 957 const u_int8_t *tstamp, *ssid, *rates, *xrates, *edcaie, *wmmie; 958 const u_int8_t *rsnie, *wpaie; 959 u_int16_t capinfo, bintval; 960 u_int8_t chan, bchan, erp; 961 int is_new; 962 963 /* 964 * We process beacon/probe response frames for: 965 * o station mode: to collect state 966 * updates such as 802.11g slot time and for passive 967 * scanning of APs 968 * o adhoc mode: to discover neighbors 969 * o hostap mode: for passive scanning of neighbor APs 970 * o when scanning 971 * In other words, in all modes other than monitor (which 972 * does not process incoming frames) and adhoc-demo (which 973 * does not use management frames at all). 974 */ 975 #ifdef DIAGNOSTIC 976 if (ic->ic_opmode != IEEE80211_M_STA && 977 #ifndef IEEE80211_STA_ONLY 978 ic->ic_opmode != IEEE80211_M_IBSS && 979 ic->ic_opmode != IEEE80211_M_HOSTAP && 980 #endif 981 ic->ic_state != IEEE80211_S_SCAN) { 982 panic("%s: impossible operating mode", __func__); 983 } 984 #endif 985 /* make sure all mandatory fixed fields are present */ 986 if (m0->m_len < sizeof(*wh) + 12) { 987 DPRINTF(("frame too short\n")); 988 return; 989 } 990 wh = mtod(m0, struct ieee80211_frame *); 991 frm = (const u_int8_t *)&wh[1]; 992 efrm = mtod(m0, u_int8_t *) + m0->m_len; 993 994 tstamp = frm; frm += 8; 995 bintval = LE_READ_2(frm); frm += 2; 996 capinfo = LE_READ_2(frm); frm += 2; 997 998 ssid = rates = xrates = edcaie = wmmie = rsnie = wpaie = NULL; 999 bchan = ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan); 1000 chan = bchan; 1001 erp = 0; 1002 while (frm + 2 <= efrm) { 1003 if (frm + 2 + frm[1] > efrm) { 1004 ic->ic_stats.is_rx_elem_toosmall++; 1005 break; 1006 } 1007 switch (frm[0]) { 1008 case IEEE80211_ELEMID_SSID: 1009 ssid = frm; 1010 break; 1011 case IEEE80211_ELEMID_RATES: 1012 rates = frm; 1013 break; 1014 case IEEE80211_ELEMID_DSPARMS: 1015 if (frm[1] < 1) { 1016 ic->ic_stats.is_rx_elem_toosmall++; 1017 break; 1018 } 1019 chan = frm[2]; 1020 break; 1021 case IEEE80211_ELEMID_TIM: 1022 break; 1023 case IEEE80211_ELEMID_IBSSPARMS: 1024 break; 1025 case IEEE80211_ELEMID_XRATES: 1026 xrates = frm; 1027 break; 1028 case IEEE80211_ELEMID_ERP: 1029 if (frm[1] < 1) { 1030 ic->ic_stats.is_rx_elem_toosmall++; 1031 break; 1032 } 1033 erp = frm[2]; 1034 break; 1035 case IEEE80211_ELEMID_RSN: 1036 rsnie = frm; 1037 break; 1038 case IEEE80211_ELEMID_EDCAPARMS: 1039 edcaie = frm; 1040 break; 1041 case IEEE80211_ELEMID_QOS_CAP: 1042 break; 1043 case IEEE80211_ELEMID_VENDOR: 1044 if (frm[1] < 4) { 1045 ic->ic_stats.is_rx_elem_toosmall++; 1046 break; 1047 } 1048 if (memcmp(frm + 2, MICROSOFT_OUI, 3) == 0) { 1049 if (frm[5] == 1) 1050 wpaie = frm; 1051 else if (frm[1] >= 5 && 1052 frm[5] == 2 && frm[6] == 1) 1053 wmmie = frm; 1054 } 1055 break; 1056 default: 1057 DPRINTF(("element id %u/len %u ignored\n", 1058 frm[0], frm[1])); 1059 ic->ic_stats.is_rx_elem_unknown++; 1060 break; 1061 } 1062 frm += 2 + frm[1]; 1063 } 1064 /* supported rates element is mandatory */ 1065 if (rates == NULL || rates[1] > IEEE80211_RATE_MAXSIZE) { 1066 DPRINTF(("invalid supported rates element\n")); 1067 return; 1068 } 1069 /* SSID element is mandatory */ 1070 if (ssid == NULL || ssid[1] > IEEE80211_NWID_LEN) { 1071 DPRINTF(("invalid SSID element\n")); 1072 return; 1073 } 1074 1075 if ( 1076 #if IEEE80211_CHAN_MAX < 255 1077 chan > IEEE80211_CHAN_MAX || 1078 #endif 1079 isclr(ic->ic_chan_active, chan)) { 1080 DPRINTF(("ignore %s with invalid channel %u\n", 1081 isprobe ? "probe response" : "beacon", chan)); 1082 ic->ic_stats.is_rx_badchan++; 1083 return; 1084 } 1085 if ((ic->ic_state != IEEE80211_S_SCAN || 1086 !(ic->ic_caps & IEEE80211_C_SCANALL)) && 1087 chan != bchan) { 1088 /* 1089 * Frame was received on a channel different from the 1090 * one indicated in the DS params element id; 1091 * silently discard it. 1092 * 1093 * NB: this can happen due to signal leakage. 1094 */ 1095 DPRINTF(("ignore %s on channel %u marked for channel %u\n", 1096 isprobe ? "probe response" : "beacon", bchan, chan)); 1097 ic->ic_stats.is_rx_chanmismatch++; 1098 return; 1099 } 1100 /* 1101 * Use mac, channel and rssi so we collect only the 1102 * best potential AP with the equal bssid while scanning. 1103 * Collecting all potential APs may result in bloat of 1104 * the node tree. This call will return NULL if the node 1105 * for this APs does not exist or if the new node is the 1106 * potential better one. 1107 */ 1108 if ((ni = ieee80211_find_node_for_beacon(ic, wh->i_addr2, 1109 &ic->ic_channels[chan], ssid, rxi->rxi_rssi)) != NULL) 1110 return; 1111 1112 #ifdef IEEE80211_DEBUG 1113 if (ieee80211_debug && 1114 (ni == NULL || ic->ic_state == IEEE80211_S_SCAN)) { 1115 printf("%s: %s%s on chan %u (bss chan %u) ", 1116 __func__, (ni == NULL ? "new " : ""), 1117 isprobe ? "probe response" : "beacon", 1118 chan, bchan); 1119 ieee80211_print_essid(ssid + 2, ssid[1]); 1120 printf(" from %s\n", ether_sprintf((u_int8_t *)wh->i_addr2)); 1121 printf("%s: caps 0x%x bintval %u erp 0x%x\n", 1122 __func__, capinfo, bintval, erp); 1123 } 1124 #endif 1125 1126 if ((ni = ieee80211_find_node(ic, wh->i_addr2)) == NULL) { 1127 ni = ieee80211_alloc_node(ic, wh->i_addr2); 1128 if (ni == NULL) 1129 return; 1130 is_new = 1; 1131 } else 1132 is_new = 0; 1133 1134 /* 1135 * When operating in station mode, check for state updates 1136 * while we're associated. We consider only 11g stuff right 1137 * now. 1138 */ 1139 if (ic->ic_opmode == IEEE80211_M_STA && 1140 ic->ic_state == IEEE80211_S_RUN && 1141 ni->ni_state == IEEE80211_STA_BSS) { 1142 /* 1143 * Check if protection mode has changed since last beacon. 1144 */ 1145 if (ni->ni_erp != erp) { 1146 DPRINTF(("[%s] erp change: was 0x%x, now 0x%x\n", 1147 ether_sprintf((u_int8_t *)wh->i_addr2), 1148 ni->ni_erp, erp)); 1149 if (ic->ic_curmode == IEEE80211_MODE_11G && 1150 (erp & IEEE80211_ERP_USE_PROTECTION)) 1151 ic->ic_flags |= IEEE80211_F_USEPROT; 1152 else 1153 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1154 ic->ic_bss->ni_erp = erp; 1155 } 1156 /* 1157 * Check if AP short slot time setting has changed 1158 * since last beacon and give the driver a chance to 1159 * update the hardware. 1160 */ 1161 if ((ni->ni_capinfo ^ capinfo) & 1162 IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1163 ieee80211_set_shortslottime(ic, 1164 ic->ic_curmode == IEEE80211_MODE_11A || 1165 (capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1166 } 1167 } 1168 /* 1169 * We do not try to update EDCA parameters if QoS was not negotiated 1170 * with the AP at association time. 1171 */ 1172 if (ni->ni_flags & IEEE80211_NODE_QOS) { 1173 /* always prefer EDCA IE over Wi-Fi Alliance WMM IE */ 1174 if (edcaie != NULL) 1175 ieee80211_parse_edca_params(ic, edcaie); 1176 else if (wmmie != NULL) 1177 ieee80211_parse_wmm_params(ic, wmmie); 1178 } 1179 1180 if (ic->ic_state == IEEE80211_S_SCAN && 1181 #ifndef IEEE80211_STA_ONLY 1182 ic->ic_opmode != IEEE80211_M_HOSTAP && 1183 #endif 1184 (ic->ic_flags & IEEE80211_F_RSNON)) { 1185 struct ieee80211_rsnparams rsn; 1186 const u_int8_t *saveie = NULL; 1187 /* 1188 * If the AP advertises both RSN and WPA IEs (WPA1+WPA2), 1189 * we only store the parameters of the highest protocol 1190 * version we support. 1191 */ 1192 if (rsnie != NULL && 1193 (ic->ic_rsnprotos & IEEE80211_PROTO_RSN)) { 1194 if (ieee80211_parse_rsn(ic, rsnie, &rsn) == 0) { 1195 ni->ni_rsnprotos = IEEE80211_PROTO_RSN; 1196 saveie = rsnie; 1197 } 1198 } else if (wpaie != NULL && 1199 (ic->ic_rsnprotos & IEEE80211_PROTO_WPA)) { 1200 if (ieee80211_parse_wpa(ic, wpaie, &rsn) == 0) { 1201 ni->ni_rsnprotos = IEEE80211_PROTO_WPA; 1202 saveie = wpaie; 1203 } 1204 } 1205 if (saveie != NULL && 1206 ieee80211_save_ie(saveie, &ni->ni_rsnie) == 0) { 1207 ni->ni_rsnakms = rsn.rsn_akms; 1208 ni->ni_rsnciphers = rsn.rsn_ciphers; 1209 ni->ni_rsngroupcipher = rsn.rsn_groupcipher; 1210 ni->ni_rsngroupmgmtcipher = rsn.rsn_groupmgmtcipher; 1211 ni->ni_rsncaps = rsn.rsn_caps; 1212 } else 1213 ni->ni_rsnprotos = IEEE80211_PROTO_NONE; 1214 } else if (ic->ic_state == IEEE80211_S_SCAN) 1215 ni->ni_rsnprotos = IEEE80211_PROTO_NONE; 1216 1217 if (ssid[1] != 0 && ni->ni_esslen == 0) { 1218 ni->ni_esslen = ssid[1]; 1219 memset(ni->ni_essid, 0, sizeof(ni->ni_essid)); 1220 /* we know that ssid[1] <= IEEE80211_NWID_LEN */ 1221 memcpy(ni->ni_essid, &ssid[2], ssid[1]); 1222 } 1223 IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3); 1224 ni->ni_rssi = rxi->rxi_rssi; 1225 ni->ni_rstamp = rxi->rxi_tstamp; 1226 memcpy(ni->ni_tstamp, tstamp, sizeof(ni->ni_tstamp)); 1227 ni->ni_intval = bintval; 1228 ni->ni_capinfo = capinfo; 1229 /* XXX validate channel # */ 1230 ni->ni_chan = &ic->ic_channels[chan]; 1231 ni->ni_erp = erp; 1232 /* NB: must be after ni_chan is setup */ 1233 ieee80211_setup_rates(ic, ni, rates, xrates, IEEE80211_F_DOSORT); 1234 1235 /* 1236 * When scanning we record results (nodes) with a zero 1237 * refcnt. Otherwise we want to hold the reference for 1238 * ibss neighbors so the nodes don't get released prematurely. 1239 * Anything else can be discarded (XXX and should be handled 1240 * above so we don't do so much work). 1241 */ 1242 if ( 1243 #ifndef IEEE80211_STA_ONLY 1244 ic->ic_opmode == IEEE80211_M_IBSS || 1245 #endif 1246 (is_new && isprobe)) { 1247 /* 1248 * Fake an association so the driver can setup it's 1249 * private state. The rate set has been setup above; 1250 * there is no handshake as in ap/station operation. 1251 */ 1252 if (ic->ic_newassoc) 1253 (*ic->ic_newassoc)(ic, ni, 1); 1254 } 1255 } 1256 1257 #ifndef IEEE80211_STA_ONLY 1258 /*- 1259 * Probe request frame format: 1260 * [tlv] SSID 1261 * [tlv] Supported rates 1262 * [tlv] Extended Supported Rates (802.11g) 1263 */ 1264 void 1265 ieee80211_recv_probe_req(struct ieee80211com *ic, struct mbuf *m0, 1266 struct ieee80211_node *ni, struct ieee80211_rxinfo *rxi) 1267 { 1268 const struct ieee80211_frame *wh; 1269 const u_int8_t *frm, *efrm; 1270 const u_int8_t *ssid, *rates, *xrates; 1271 u_int8_t rate; 1272 1273 if (ic->ic_opmode == IEEE80211_M_STA || 1274 ic->ic_state != IEEE80211_S_RUN) 1275 return; 1276 1277 wh = mtod(m0, struct ieee80211_frame *); 1278 frm = (const u_int8_t *)&wh[1]; 1279 efrm = mtod(m0, u_int8_t *) + m0->m_len; 1280 1281 ssid = rates = xrates = NULL; 1282 while (frm + 2 <= efrm) { 1283 if (frm + 2 + frm[1] > efrm) { 1284 ic->ic_stats.is_rx_elem_toosmall++; 1285 break; 1286 } 1287 switch (frm[0]) { 1288 case IEEE80211_ELEMID_SSID: 1289 ssid = frm; 1290 break; 1291 case IEEE80211_ELEMID_RATES: 1292 rates = frm; 1293 break; 1294 case IEEE80211_ELEMID_XRATES: 1295 xrates = frm; 1296 break; 1297 } 1298 frm += 2 + frm[1]; 1299 } 1300 /* supported rates element is mandatory */ 1301 if (rates == NULL || rates[1] > IEEE80211_RATE_MAXSIZE) { 1302 DPRINTF(("invalid supported rates element\n")); 1303 return; 1304 } 1305 /* SSID element is mandatory */ 1306 if (ssid == NULL || ssid[1] > IEEE80211_NWID_LEN) { 1307 DPRINTF(("invalid SSID element\n")); 1308 return; 1309 } 1310 /* check that the specified SSID (if not wildcard) matches ours */ 1311 if (ssid[1] != 0 && (ssid[1] != ic->ic_bss->ni_esslen || 1312 memcmp(&ssid[2], ic->ic_bss->ni_essid, ic->ic_bss->ni_esslen))) { 1313 DPRINTF(("SSID mismatch\n")); 1314 ic->ic_stats.is_rx_ssidmismatch++; 1315 return; 1316 } 1317 /* refuse wildcard SSID if we're hiding our SSID in beacons */ 1318 if (ssid[1] == 0 && (ic->ic_flags & IEEE80211_F_HIDENWID)) { 1319 DPRINTF(("wildcard SSID rejected")); 1320 ic->ic_stats.is_rx_ssidmismatch++; 1321 return; 1322 } 1323 1324 if (ni == ic->ic_bss) { 1325 ni = ieee80211_dup_bss(ic, wh->i_addr2); 1326 if (ni == NULL) 1327 return; 1328 DPRINTF(("new probe req from %s\n", 1329 ether_sprintf((u_int8_t *)wh->i_addr2))); 1330 } 1331 ni->ni_rssi = rxi->rxi_rssi; 1332 ni->ni_rstamp = rxi->rxi_tstamp; 1333 rate = ieee80211_setup_rates(ic, ni, rates, xrates, 1334 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | 1335 IEEE80211_F_DODEL); 1336 if (rate & IEEE80211_RATE_BASIC) { 1337 DPRINTF(("rate mismatch for %s\n", 1338 ether_sprintf((u_int8_t *)wh->i_addr2))); 1339 return; 1340 } 1341 IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0); 1342 } 1343 #endif /* IEEE80211_STA_ONLY */ 1344 1345 /*- 1346 * Authentication frame format: 1347 * [2] Authentication algorithm number 1348 * [2] Authentication transaction sequence number 1349 * [2] Status code 1350 */ 1351 void 1352 ieee80211_recv_auth(struct ieee80211com *ic, struct mbuf *m0, 1353 struct ieee80211_node *ni, struct ieee80211_rxinfo *rxi) 1354 { 1355 const struct ieee80211_frame *wh; 1356 const u_int8_t *frm; 1357 u_int16_t algo, seq, status; 1358 1359 /* make sure all mandatory fixed fields are present */ 1360 if (m0->m_len < sizeof(*wh) + 6) { 1361 DPRINTF(("frame too short\n")); 1362 return; 1363 } 1364 wh = mtod(m0, struct ieee80211_frame *); 1365 frm = (const u_int8_t *)&wh[1]; 1366 1367 algo = LE_READ_2(frm); frm += 2; 1368 seq = LE_READ_2(frm); frm += 2; 1369 status = LE_READ_2(frm); frm += 2; 1370 DPRINTF(("auth %d seq %d from %s\n", algo, seq, 1371 ether_sprintf((u_int8_t *)wh->i_addr2))); 1372 1373 /* only "open" auth mode is supported */ 1374 if (algo != IEEE80211_AUTH_ALG_OPEN) { 1375 DPRINTF(("unsupported auth algorithm %d from %s\n", 1376 algo, ether_sprintf((u_int8_t *)wh->i_addr2))); 1377 ic->ic_stats.is_rx_auth_unsupported++; 1378 #ifndef IEEE80211_STA_ONLY 1379 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 1380 /* XXX hack to workaround calling convention */ 1381 IEEE80211_SEND_MGMT(ic, ni, 1382 IEEE80211_FC0_SUBTYPE_AUTH, 1383 (seq+1) | (IEEE80211_STATUS_ALG<<16)); 1384 } 1385 #endif 1386 return; 1387 } 1388 ieee80211_auth_open(ic, wh, ni, rxi, seq, status); 1389 } 1390 1391 #ifndef IEEE80211_STA_ONLY 1392 /*- 1393 * (Re)Association request frame format: 1394 * [2] Capability information 1395 * [2] Listen interval 1396 * [6*] Current AP address (Reassociation only) 1397 * [tlv] SSID 1398 * [tlv] Supported rates 1399 * [tlv] Extended Supported Rates (802.11g) 1400 * [tlv] RSN (802.11i) 1401 * [tlv] QoS Capability (802.11e) 1402 */ 1403 void 1404 ieee80211_recv_assoc_req(struct ieee80211com *ic, struct mbuf *m0, 1405 struct ieee80211_node *ni, struct ieee80211_rxinfo *rxi, int reassoc) 1406 { 1407 const struct ieee80211_frame *wh; 1408 const u_int8_t *frm, *efrm; 1409 const u_int8_t *ssid, *rates, *xrates, *rsnie, *wpaie; 1410 u_int16_t capinfo, bintval; 1411 int resp, status = 0; 1412 struct ieee80211_rsnparams rsn; 1413 u_int8_t rate; 1414 1415 if (ic->ic_opmode != IEEE80211_M_HOSTAP || 1416 ic->ic_state != IEEE80211_S_RUN) 1417 return; 1418 1419 /* make sure all mandatory fixed fields are present */ 1420 if (m0->m_len < sizeof(*wh) + (reassoc ? 10 : 4)) { 1421 DPRINTF(("frame too short\n")); 1422 return; 1423 } 1424 wh = mtod(m0, struct ieee80211_frame *); 1425 frm = (const u_int8_t *)&wh[1]; 1426 efrm = mtod(m0, u_int8_t *) + m0->m_len; 1427 1428 if (!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid)) { 1429 DPRINTF(("ignore other bss from %s\n", 1430 ether_sprintf((u_int8_t *)wh->i_addr2))); 1431 ic->ic_stats.is_rx_assoc_bss++; 1432 return; 1433 } 1434 capinfo = LE_READ_2(frm); frm += 2; 1435 bintval = LE_READ_2(frm); frm += 2; 1436 if (reassoc) 1437 frm += IEEE80211_ADDR_LEN; /* skip current AP address */ 1438 1439 ssid = rates = xrates = rsnie = wpaie = NULL; 1440 while (frm + 2 <= efrm) { 1441 if (frm + 2 + frm[1] > efrm) { 1442 ic->ic_stats.is_rx_elem_toosmall++; 1443 break; 1444 } 1445 switch (frm[0]) { 1446 case IEEE80211_ELEMID_SSID: 1447 ssid = frm; 1448 break; 1449 case IEEE80211_ELEMID_RATES: 1450 rates = frm; 1451 break; 1452 case IEEE80211_ELEMID_XRATES: 1453 xrates = frm; 1454 break; 1455 case IEEE80211_ELEMID_RSN: 1456 rsnie = frm; 1457 break; 1458 case IEEE80211_ELEMID_QOS_CAP: 1459 break; 1460 case IEEE80211_ELEMID_VENDOR: 1461 if (frm[1] < 4) { 1462 ic->ic_stats.is_rx_elem_toosmall++; 1463 break; 1464 } 1465 if (memcmp(frm + 2, MICROSOFT_OUI, 3) == 0) { 1466 if (frm[5] == 1) 1467 wpaie = frm; 1468 } 1469 break; 1470 } 1471 frm += 2 + frm[1]; 1472 } 1473 /* supported rates element is mandatory */ 1474 if (rates == NULL || rates[1] > IEEE80211_RATE_MAXSIZE) { 1475 DPRINTF(("invalid supported rates element\n")); 1476 return; 1477 } 1478 /* SSID element is mandatory */ 1479 if (ssid == NULL || ssid[1] > IEEE80211_NWID_LEN) { 1480 DPRINTF(("invalid SSID element\n")); 1481 return; 1482 } 1483 /* check that the specified SSID matches ours */ 1484 if (ssid[1] != ic->ic_bss->ni_esslen || 1485 memcmp(&ssid[2], ic->ic_bss->ni_essid, ic->ic_bss->ni_esslen)) { 1486 DPRINTF(("SSID mismatch\n")); 1487 ic->ic_stats.is_rx_ssidmismatch++; 1488 return; 1489 } 1490 1491 if (ni->ni_state != IEEE80211_STA_AUTH && 1492 ni->ni_state != IEEE80211_STA_ASSOC) { 1493 DPRINTF(("deny %sassoc from %s, not authenticated\n", 1494 reassoc ? "re" : "", 1495 ether_sprintf((u_int8_t *)wh->i_addr2))); 1496 ni = ieee80211_dup_bss(ic, wh->i_addr2); 1497 if (ni != NULL) { 1498 IEEE80211_SEND_MGMT(ic, ni, 1499 IEEE80211_FC0_SUBTYPE_DEAUTH, 1500 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1501 } 1502 ic->ic_stats.is_rx_assoc_notauth++; 1503 return; 1504 } 1505 1506 if (!(capinfo & IEEE80211_CAPINFO_ESS)) { 1507 ic->ic_stats.is_rx_assoc_capmismatch++; 1508 status = IEEE80211_STATUS_CAPINFO; 1509 goto end; 1510 } 1511 rate = ieee80211_setup_rates(ic, ni, rates, xrates, 1512 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | 1513 IEEE80211_F_DODEL); 1514 if (rate & IEEE80211_RATE_BASIC) { 1515 ic->ic_stats.is_rx_assoc_norate++; 1516 status = IEEE80211_STATUS_BASIC_RATE; 1517 goto end; 1518 } 1519 1520 if (ic->ic_flags & IEEE80211_F_RSNON) { 1521 const u_int8_t *saveie; 1522 /* 1523 * A station should never include both a WPA and an RSN IE 1524 * in its (Re)Association Requests, but if it does, we only 1525 * consider the IE of the highest version of the protocol 1526 * that is allowed (ie RSN over WPA). 1527 */ 1528 if (rsnie != NULL && 1529 (ic->ic_rsnprotos & IEEE80211_PROTO_RSN)) { 1530 status = ieee80211_parse_rsn(ic, rsnie, &rsn); 1531 if (status != 0) 1532 goto end; 1533 ni->ni_rsnprotos = IEEE80211_PROTO_RSN; 1534 saveie = rsnie; 1535 } else if (wpaie != NULL && 1536 (ic->ic_rsnprotos & IEEE80211_PROTO_WPA)) { 1537 status = ieee80211_parse_wpa(ic, wpaie, &rsn); 1538 if (status != 0) 1539 goto end; 1540 ni->ni_rsnprotos = IEEE80211_PROTO_WPA; 1541 saveie = wpaie; 1542 } else { 1543 /* 1544 * In an RSN, an AP shall not associate with STAs 1545 * that fail to include the RSN IE in the 1546 * (Re)Association Request. 1547 */ 1548 status = IEEE80211_STATUS_IE_INVALID; 1549 goto end; 1550 } 1551 /* 1552 * The initiating STA's RSN IE shall include one authentication 1553 * and pairwise cipher suite among those advertised by the 1554 * targeted AP. It shall also specify the group cipher suite 1555 * specified by the targeted AP. 1556 */ 1557 if (rsn.rsn_nakms != 1 || 1558 !(rsn.rsn_akms & ic->ic_bss->ni_rsnakms)) { 1559 status = IEEE80211_STATUS_BAD_AKMP; 1560 goto end; 1561 } 1562 if (rsn.rsn_nciphers != 1 || 1563 !(rsn.rsn_ciphers & ic->ic_bss->ni_rsnciphers)) { 1564 status = IEEE80211_STATUS_BAD_PAIRWISE_CIPHER; 1565 goto end; 1566 } 1567 if (rsn.rsn_groupcipher != ic->ic_bss->ni_rsngroupcipher) { 1568 status = IEEE80211_STATUS_BAD_GROUP_CIPHER; 1569 goto end; 1570 } 1571 1572 if (!(rsn.rsn_caps & IEEE80211_RSNCAP_MFPC) && 1573 (ic->ic_bss->ni_rsncaps & IEEE80211_RSNCAP_MFPR)) { 1574 status = IEEE80211_REASON_MFP_POLICY; /* XXX */ 1575 goto end; 1576 } 1577 if ((ic->ic_bss->ni_rsncaps & IEEE80211_RSNCAP_MFPC) && 1578 (rsn.rsn_caps & (IEEE80211_RSNCAP_MFPC | 1579 IEEE80211_RSNCAP_MFPR)) == IEEE80211_RSNCAP_MFPR) { 1580 /* STA advertises an invalid setting */ 1581 status = IEEE80211_REASON_MFP_POLICY; /* XXX */ 1582 goto end; 1583 } 1584 if ((rsn.rsn_caps & IEEE80211_RSNCAP_MFPC) && 1585 rsn.rsn_groupmgmtcipher != 1586 ic->ic_bss->ni_rsngroupmgmtcipher) { 1587 /* XXX satus not reason?! */ 1588 status = IEEE80211_REASON_BAD_GROUP_MGMT_CIPHER; 1589 goto end; 1590 } 1591 1592 /* 1593 * Disallow new associations using TKIP if countermeasures 1594 * are active. 1595 */ 1596 if ((ic->ic_flags & IEEE80211_F_COUNTERM) && 1597 (rsn.rsn_ciphers == IEEE80211_CIPHER_TKIP || 1598 rsn.rsn_groupcipher == IEEE80211_CIPHER_TKIP)) { 1599 status = IEEE80211_STATUS_CIPHER_REJ_POLICY; 1600 goto end; 1601 } 1602 1603 /* everything looks fine, save IE and parameters */ 1604 if (ieee80211_save_ie(saveie, &ni->ni_rsnie) != 0) { 1605 status = IEEE80211_STATUS_TOOMANY; 1606 goto end; 1607 } 1608 ni->ni_rsnakms = rsn.rsn_akms; 1609 ni->ni_rsnciphers = rsn.rsn_ciphers; 1610 ni->ni_rsngroupcipher = ic->ic_bss->ni_rsngroupcipher; 1611 ni->ni_rsngroupmgmtcipher = ic->ic_bss->ni_rsngroupmgmtcipher; 1612 ni->ni_rsncaps = rsn.rsn_caps; 1613 1614 if (ieee80211_is_8021x_akm(ni->ni_rsnakms)) { 1615 struct ieee80211_pmk *pmk = NULL; 1616 const u_int8_t *pmkid = rsn.rsn_pmkids; 1617 /* 1618 * Check if we have a cached PMK entry matching one 1619 * of the PMKIDs specified in the RSN IE. 1620 */ 1621 while (rsn.rsn_npmkids-- > 0) { 1622 pmk = ieee80211_pmksa_find(ic, ni, pmkid); 1623 if (pmk != NULL) 1624 break; 1625 pmkid += IEEE80211_PMKID_LEN; 1626 } 1627 if (pmk != NULL) { 1628 memcpy(ni->ni_pmk, pmk->pmk_key, 1629 IEEE80211_PMK_LEN); 1630 memcpy(ni->ni_pmkid, pmk->pmk_pmkid, 1631 IEEE80211_PMKID_LEN); 1632 ni->ni_flags |= IEEE80211_NODE_PMK; 1633 } 1634 } 1635 } else 1636 ni->ni_rsnprotos = IEEE80211_PROTO_NONE; 1637 1638 ni->ni_rssi = rxi->rxi_rssi; 1639 ni->ni_rstamp = rxi->rxi_tstamp; 1640 ni->ni_intval = bintval; 1641 ni->ni_capinfo = capinfo; 1642 ni->ni_chan = ic->ic_bss->ni_chan; 1643 end: 1644 resp = reassoc ? IEEE80211_FC0_SUBTYPE_REASSOC_RESP : 1645 IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1646 if (status != 0) { 1647 IEEE80211_SEND_MGMT(ic, ni, resp, status); 1648 ieee80211_node_leave(ic, ni); 1649 } else 1650 ieee80211_node_join(ic, ni, resp); 1651 } 1652 #endif /* IEEE80211_STA_ONLY */ 1653 1654 /*- 1655 * (Re)Association response frame format: 1656 * [2] Capability information 1657 * [2] Status code 1658 * [2] Association ID (AID) 1659 * [tlv] Supported rates 1660 * [tlv] Extended Supported Rates (802.11g) 1661 * [tlv] EDCA Parameter Set (802.11e) 1662 */ 1663 void 1664 ieee80211_recv_assoc_resp(struct ieee80211com *ic, struct mbuf *m0, 1665 struct ieee80211_node *ni, int reassoc) 1666 { 1667 struct ifnet *ifp = &ic->ic_if; 1668 const struct ieee80211_frame *wh; 1669 const u_int8_t *frm, *efrm; 1670 const u_int8_t *rates, *xrates, *edcaie, *wmmie; 1671 u_int16_t capinfo, status, associd; 1672 u_int8_t rate; 1673 1674 if (ic->ic_opmode != IEEE80211_M_STA || 1675 ic->ic_state != IEEE80211_S_ASSOC) { 1676 ic->ic_stats.is_rx_mgtdiscard++; 1677 return; 1678 } 1679 1680 /* make sure all mandatory fixed fields are present */ 1681 if (m0->m_len < sizeof(*wh) + 6) { 1682 DPRINTF(("frame too short\n")); 1683 return; 1684 } 1685 wh = mtod(m0, struct ieee80211_frame *); 1686 frm = (const u_int8_t *)&wh[1]; 1687 efrm = mtod(m0, u_int8_t *) + m0->m_len; 1688 1689 capinfo = LE_READ_2(frm); frm += 2; 1690 status = LE_READ_2(frm); frm += 2; 1691 if (status != IEEE80211_STATUS_SUCCESS) { 1692 if (ifp->if_flags & IFF_DEBUG) 1693 printf("%s: %sassociation failed (reason %d)" 1694 " for %s\n", ifp->if_xname, 1695 reassoc ? "re" : "", 1696 status, ether_sprintf((u_int8_t *)wh->i_addr3)); 1697 if (ni != ic->ic_bss) 1698 ni->ni_fails++; 1699 ic->ic_stats.is_rx_auth_fail++; 1700 return; 1701 } 1702 associd = LE_READ_2(frm); frm += 2; 1703 1704 rates = xrates = edcaie = wmmie = NULL; 1705 while (frm + 2 <= efrm) { 1706 if (frm + 2 + frm[1] > efrm) { 1707 ic->ic_stats.is_rx_elem_toosmall++; 1708 break; 1709 } 1710 switch (frm[0]) { 1711 case IEEE80211_ELEMID_RATES: 1712 rates = frm; 1713 break; 1714 case IEEE80211_ELEMID_XRATES: 1715 xrates = frm; 1716 break; 1717 case IEEE80211_ELEMID_EDCAPARMS: 1718 edcaie = frm; 1719 break; 1720 case IEEE80211_ELEMID_VENDOR: 1721 if (frm[1] < 4) { 1722 ic->ic_stats.is_rx_elem_toosmall++; 1723 break; 1724 } 1725 if (memcmp(frm + 2, MICROSOFT_OUI, 3) == 0) { 1726 if (frm[1] >= 5 && frm[5] == 2 && frm[6] == 1) 1727 wmmie = frm; 1728 } 1729 break; 1730 } 1731 frm += 2 + frm[1]; 1732 } 1733 /* supported rates element is mandatory */ 1734 if (rates == NULL || rates[1] > IEEE80211_RATE_MAXSIZE) { 1735 DPRINTF(("invalid supported rates element\n")); 1736 return; 1737 } 1738 rate = ieee80211_setup_rates(ic, ni, rates, xrates, 1739 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | 1740 IEEE80211_F_DODEL); 1741 if (rate & IEEE80211_RATE_BASIC) { 1742 DPRINTF(("rate mismatch for %s\n", 1743 ether_sprintf((u_int8_t *)wh->i_addr2))); 1744 ic->ic_stats.is_rx_assoc_norate++; 1745 return; 1746 } 1747 ni->ni_capinfo = capinfo; 1748 ni->ni_associd = associd; 1749 if (edcaie != NULL || wmmie != NULL) { 1750 /* force update of EDCA parameters */ 1751 ic->ic_edca_updtcount = -1; 1752 1753 if ((edcaie != NULL && 1754 ieee80211_parse_edca_params(ic, edcaie) == 0) || 1755 (wmmie != NULL && 1756 ieee80211_parse_wmm_params(ic, wmmie) == 0)) 1757 ni->ni_flags |= IEEE80211_NODE_QOS; 1758 else /* for Reassociation */ 1759 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1760 } 1761 /* 1762 * Configure state now that we are associated. 1763 */ 1764 if (ic->ic_curmode == IEEE80211_MODE_11A || 1765 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) 1766 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1767 else 1768 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1769 1770 ieee80211_set_shortslottime(ic, 1771 ic->ic_curmode == IEEE80211_MODE_11A || 1772 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1773 /* 1774 * Honor ERP protection. 1775 */ 1776 if (ic->ic_curmode == IEEE80211_MODE_11G && 1777 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1778 ic->ic_flags |= IEEE80211_F_USEPROT; 1779 else 1780 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1781 /* 1782 * If not an RSNA, mark the port as valid, otherwise wait for 1783 * 802.1X authentication and 4-way handshake to complete.. 1784 */ 1785 if (ic->ic_flags & IEEE80211_F_RSNON) { 1786 /* XXX ic->ic_mgt_timer = 5; */ 1787 } else if (ic->ic_flags & IEEE80211_F_WEPON) 1788 ni->ni_flags |= IEEE80211_NODE_TXRXPROT; 1789 1790 ieee80211_new_state(ic, IEEE80211_S_RUN, 1791 IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 1792 } 1793 1794 /*- 1795 * Deauthentication frame format: 1796 * [2] Reason code 1797 */ 1798 void 1799 ieee80211_recv_deauth(struct ieee80211com *ic, struct mbuf *m0, 1800 struct ieee80211_node *ni) 1801 { 1802 const struct ieee80211_frame *wh; 1803 const u_int8_t *frm; 1804 u_int16_t reason; 1805 1806 /* make sure all mandatory fixed fields are present */ 1807 if (m0->m_len < sizeof(*wh) + 2) { 1808 DPRINTF(("frame too short\n")); 1809 return; 1810 } 1811 wh = mtod(m0, struct ieee80211_frame *); 1812 frm = (const u_int8_t *)&wh[1]; 1813 1814 reason = LE_READ_2(frm); 1815 1816 ic->ic_stats.is_rx_deauth++; 1817 switch (ic->ic_opmode) { 1818 case IEEE80211_M_STA: 1819 ieee80211_new_state(ic, IEEE80211_S_AUTH, 1820 IEEE80211_FC0_SUBTYPE_DEAUTH); 1821 break; 1822 #ifndef IEEE80211_STA_ONLY 1823 case IEEE80211_M_HOSTAP: 1824 if (ni != ic->ic_bss) { 1825 if (ic->ic_if.if_flags & IFF_DEBUG) 1826 printf("%s: station %s deauthenticated " 1827 "by peer (reason %d)\n", 1828 ic->ic_if.if_xname, 1829 ether_sprintf(ni->ni_macaddr), 1830 reason); 1831 ieee80211_node_leave(ic, ni); 1832 } 1833 break; 1834 #endif 1835 default: 1836 break; 1837 } 1838 } 1839 1840 /*- 1841 * Disassociation frame format: 1842 * [2] Reason code 1843 */ 1844 void 1845 ieee80211_recv_disassoc(struct ieee80211com *ic, struct mbuf *m0, 1846 struct ieee80211_node *ni) 1847 { 1848 const struct ieee80211_frame *wh; 1849 const u_int8_t *frm; 1850 u_int16_t reason; 1851 1852 /* make sure all mandatory fixed fields are present */ 1853 if (m0->m_len < sizeof(*wh) + 2) { 1854 DPRINTF(("frame too short\n")); 1855 return; 1856 } 1857 wh = mtod(m0, struct ieee80211_frame *); 1858 frm = (const u_int8_t *)&wh[1]; 1859 1860 reason = LE_READ_2(frm); 1861 1862 ic->ic_stats.is_rx_disassoc++; 1863 switch (ic->ic_opmode) { 1864 case IEEE80211_M_STA: 1865 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 1866 IEEE80211_FC0_SUBTYPE_DISASSOC); 1867 break; 1868 #ifndef IEEE80211_STA_ONLY 1869 case IEEE80211_M_HOSTAP: 1870 if (ni != ic->ic_bss) { 1871 if (ic->ic_if.if_flags & IFF_DEBUG) 1872 printf("%s: station %s disassociated " 1873 "by peer (reason %d)\n", 1874 ic->ic_if.if_xname, 1875 ether_sprintf(ni->ni_macaddr), 1876 reason); 1877 ieee80211_node_leave(ic, ni); 1878 } 1879 break; 1880 #endif 1881 default: 1882 break; 1883 } 1884 } 1885 1886 /*- 1887 * Action frame format: 1888 * [1] Category 1889 * [1] Action 1890 */ 1891 void 1892 ieee80211_recv_action(struct ieee80211com *ic, struct mbuf *m0, 1893 struct ieee80211_node *ni) 1894 { 1895 const struct ieee80211_frame *wh; 1896 const u_int8_t *frm; 1897 1898 if (m0->m_len < sizeof(*wh) + 2) { 1899 DPRINTF(("frame too short\n")); 1900 return; 1901 } 1902 wh = mtod(m0, struct ieee80211_frame *); 1903 frm = (const u_int8_t *)&wh[1]; 1904 1905 switch (frm[0]) { 1906 case IEEE80211_CATEG_BA: 1907 switch (frm[1]) { 1908 case IEEE80211_ACTION_ADDBA_REQ: 1909 /* NYI */ 1910 break; 1911 case IEEE80211_ACTION_ADDBA_RESP: 1912 /* NYI */ 1913 break; 1914 case IEEE80211_ACTION_DELBA: 1915 /* NYI */ 1916 break; 1917 } 1918 break; 1919 case IEEE80211_CATEG_HT: 1920 switch (frm[1]) { 1921 case IEEE80211_ACTION_NOTIFYCW: 1922 /* NYI */ 1923 break; 1924 } 1925 break; 1926 case IEEE80211_CATEG_SALT: 1927 switch (frm[1]) { 1928 case IEEE80211_ACTION_SALT_REQ: 1929 /* NYI */ 1930 break; 1931 case IEEE80211_ACTION_SALT_RESP: 1932 /* NYI */ 1933 break; 1934 } 1935 break; 1936 default: 1937 DPRINTF(("action frame category %d not handled\n", frm[0])); 1938 break; 1939 } 1940 } 1941 1942 void 1943 ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0, 1944 struct ieee80211_node *ni, struct ieee80211_rxinfo *rxi, int subtype) 1945 { 1946 switch (subtype) { 1947 case IEEE80211_FC0_SUBTYPE_BEACON: 1948 ieee80211_recv_probe_resp(ic, m0, ni, rxi, 0); 1949 break; 1950 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1951 ieee80211_recv_probe_resp(ic, m0, ni, rxi, 1); 1952 break; 1953 #ifndef IEEE80211_STA_ONLY 1954 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1955 ieee80211_recv_probe_req(ic, m0, ni, rxi); 1956 break; 1957 #endif 1958 case IEEE80211_FC0_SUBTYPE_AUTH: 1959 ieee80211_recv_auth(ic, m0, ni, rxi); 1960 break; 1961 #ifndef IEEE80211_STA_ONLY 1962 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1963 ieee80211_recv_assoc_req(ic, m0, ni, rxi, 0); 1964 break; 1965 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1966 ieee80211_recv_assoc_req(ic, m0, ni, rxi, 1); 1967 break; 1968 #endif 1969 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1970 ieee80211_recv_assoc_resp(ic, m0, ni, 0); 1971 break; 1972 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1973 ieee80211_recv_assoc_resp(ic, m0, ni, 1); 1974 break; 1975 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1976 ieee80211_recv_deauth(ic, m0, ni); 1977 break; 1978 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1979 ieee80211_recv_disassoc(ic, m0, ni); 1980 break; 1981 case IEEE80211_FC0_SUBTYPE_ACTION: 1982 ieee80211_recv_action(ic, m0, ni); 1983 break; 1984 default: 1985 DPRINTF(("mgmt frame with subtype 0x%x not handled\n", 1986 subtype)); 1987 ic->ic_stats.is_rx_badsubtype++; 1988 break; 1989 } 1990 } 1991 1992 #ifndef IEEE80211_STA_ONLY 1993 /* 1994 * Process an incoming PS-Poll control frame (see 11.2). 1995 */ 1996 void 1997 ieee80211_recv_pspoll(struct ieee80211com *ic, struct mbuf *m, 1998 struct ieee80211_node *ni) 1999 { 2000 struct ifnet *ifp = &ic->ic_if; 2001 struct ieee80211_frame_pspoll *psp; 2002 struct ieee80211_frame *wh; 2003 u_int16_t aid; 2004 2005 if (ic->ic_opmode != IEEE80211_M_HOSTAP || 2006 !(ic->ic_caps & IEEE80211_C_APPMGT) || 2007 ni->ni_state != IEEE80211_STA_ASSOC) 2008 return; 2009 2010 if (m->m_len < sizeof(*psp)) { 2011 DPRINTF(("frame too short, len %u\n", m->m_len)); 2012 ic->ic_stats.is_rx_tooshort++; 2013 return; 2014 } 2015 psp = mtod(m, struct ieee80211_frame_pspoll *); 2016 if (!IEEE80211_ADDR_EQ(psp->i_bssid, ic->ic_bss->ni_bssid)) { 2017 DPRINTF(("discard pspoll frame to BSS %s\n", 2018 ether_sprintf(psp->i_bssid))); 2019 ic->ic_stats.is_rx_wrongbss++; 2020 return; 2021 } 2022 aid = letoh16(*(u_int16_t *)psp->i_aid); 2023 if (aid != ni->ni_associd) { 2024 DPRINTF(("invalid pspoll aid %x from %s\n", aid, 2025 ether_sprintf(psp->i_ta))); 2026 return; 2027 } 2028 2029 /* take the first queued frame and put it out.. */ 2030 IF_DEQUEUE(&ni->ni_savedq, m); 2031 if (m == NULL) 2032 return; 2033 if (IF_IS_EMPTY(&ni->ni_savedq)) { 2034 /* last queued frame, turn off the TIM bit */ 2035 (*ic->ic_set_tim)(ic, ni->ni_associd, 0); 2036 } else { 2037 /* more queued frames, set the more data bit */ 2038 wh = mtod(m, struct ieee80211_frame *); 2039 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 2040 } 2041 IF_ENQUEUE(&ic->ic_pwrsaveq, m); 2042 (*ifp->if_start)(ifp); 2043 } 2044 #endif /* IEEE80211_STA_ONLY */ 2045