ieee80211_input.c revision 1.26
1 /* $NetBSD: ieee80211_input.c,v 1.26 2004/07/23 08:05:00 mycroft Exp $ */ 2 /*- 3 * Copyright (c) 2001 Atsushi Onoe 4 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * Alternatively, this software may be distributed under the terms of the 19 * GNU General Public License ("GPL") version 2 as published by the Free 20 * Software Foundation. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #ifdef __FreeBSD__ 36 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_input.c,v 1.20 2004/04/02 23:35:24 sam Exp $"); 37 #else 38 __KERNEL_RCSID(0, "$NetBSD: ieee80211_input.c,v 1.26 2004/07/23 08:05:00 mycroft Exp $"); 39 #endif 40 41 #include "opt_inet.h" 42 43 #ifdef __NetBSD__ 44 #include "bpfilter.h" 45 #endif /* __NetBSD__ */ 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/mbuf.h> 50 #include <sys/malloc.h> 51 #include <sys/kernel.h> 52 #include <sys/socket.h> 53 #include <sys/sockio.h> 54 #include <sys/endian.h> 55 #include <sys/errno.h> 56 #ifdef __FreeBSD__ 57 #include <sys/bus.h> 58 #endif 59 #include <sys/proc.h> 60 #include <sys/sysctl.h> 61 62 #ifdef __FreeBSD__ 63 #include <machine/atomic.h> 64 #endif 65 66 #include <net/if.h> 67 #include <net/if_dl.h> 68 #include <net/if_media.h> 69 #include <net/if_arp.h> 70 #ifdef __FreeBSD__ 71 #include <net/ethernet.h> 72 #else 73 #include <net/if_ether.h> 74 #endif 75 #include <net/if_llc.h> 76 77 #include <net80211/ieee80211_var.h> 78 #include <net80211/ieee80211_compat.h> 79 80 #if NBPFILTER > 0 81 #include <net/bpf.h> 82 #endif 83 84 #ifdef INET 85 #include <netinet/in.h> 86 #ifdef __FreeBSD__ 87 #include <netinet/if_ether.h> 88 #else 89 #include <net/if_ether.h> 90 #endif 91 #endif 92 93 static void ieee80211_recv_pspoll(struct ieee80211com *, 94 struct mbuf *, int, u_int32_t); 95 96 #ifdef IEEE80211_DEBUG 97 /* 98 * Decide if a received management frame should be 99 * printed when debugging is enabled. This filters some 100 * of the less interesting frames that come frequently 101 * (e.g. beacons). 102 */ 103 static __inline int 104 doprint(struct ieee80211com *ic, int subtype) 105 { 106 switch (subtype) { 107 case IEEE80211_FC0_SUBTYPE_BEACON: 108 return (ic->ic_state == IEEE80211_S_SCAN); 109 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 110 return (ic->ic_opmode == IEEE80211_M_IBSS); 111 } 112 return 1; 113 } 114 #endif 115 116 /* 117 * Process a received frame. The node associated with the sender 118 * should be supplied. If nothing was found in the node table then 119 * the caller is assumed to supply a reference to ic_bss instead. 120 * The RSSI and a timestamp are also supplied. The RSSI data is used 121 * during AP scanning to select a AP to associate with; it can have 122 * any units so long as values have consistent units and higher values 123 * mean ``better signal''. The receive timestamp is currently not used 124 * by the 802.11 layer. 125 */ 126 void 127 ieee80211_input(struct ifnet *ifp, struct mbuf *m, struct ieee80211_node *ni, 128 int rssi, u_int32_t rstamp) 129 { 130 struct ieee80211com *ic = (void *)ifp; 131 struct ieee80211_frame *wh; 132 struct ether_header *eh; 133 struct mbuf *m1; 134 int len; 135 u_int8_t dir, type, subtype; 136 u_int8_t *bssid; 137 u_int16_t rxseq; 138 ALTQ_DECL(struct altq_pktattr pktattr;) 139 140 IASSERT(ni != NULL, ("null node")); 141 142 /* trim CRC here so WEP can find its own CRC at the end of packet. */ 143 if (m->m_flags & M_HASFCS) { 144 m_adj(m, -IEEE80211_CRC_LEN); 145 m->m_flags &= ~M_HASFCS; 146 } 147 148 /* 149 * In monitor mode, send everything directly to bpf. 150 * Also do not process frames w/o i_addr2 any further. 151 * XXX may want to include the CRC 152 */ 153 if (ic->ic_opmode == IEEE80211_M_MONITOR || 154 m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) 155 goto out; 156 157 wh = mtod(m, struct ieee80211_frame *); 158 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 159 IEEE80211_FC0_VERSION_0) { 160 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 161 ("receive packet with wrong version: %x\n", 162 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 * NB: We are not yet prepared to handle control frames, 171 * but permitting drivers to send them to us allows 172 * them to go through bpf tapping at the 802.11 layer. 173 */ 174 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 175 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 176 ("%s: frame too short, len %u\n", 177 __func__, m->m_pkthdr.len)); 178 ic->ic_stats.is_rx_tooshort++; 179 goto out; 180 } 181 if (ic->ic_state != IEEE80211_S_SCAN) { 182 switch (ic->ic_opmode) { 183 case IEEE80211_M_STA: 184 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid)) { 185 /* not interested in */ 186 IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT, 187 ("%s: discard frame from " 188 "bss %s\n", __func__, 189 ether_sprintf(wh->i_addr2))); 190 ic->ic_stats.is_rx_wrongbss++; 191 goto out; 192 } 193 break; 194 case IEEE80211_M_IBSS: 195 case IEEE80211_M_AHDEMO: 196 case IEEE80211_M_HOSTAP: 197 if (dir == IEEE80211_FC1_DIR_NODS) 198 bssid = wh->i_addr3; 199 else 200 bssid = wh->i_addr1; 201 if (!IEEE80211_ADDR_EQ(bssid, ic->ic_bss->ni_bssid) && 202 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr) && 203 (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == 204 IEEE80211_FC0_TYPE_DATA) { 205 /* not interested in */ 206 IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT, 207 ("%s: discard data frame from bss %s\n", 208 __func__, ether_sprintf(bssid))); 209 ic->ic_stats.is_rx_wrongbss++; 210 goto out; 211 } 212 break; 213 case IEEE80211_M_MONITOR: 214 goto out; 215 default: 216 /* XXX catch bad values */ 217 break; 218 } 219 ni->ni_rssi = rssi; 220 ni->ni_rstamp = rstamp; 221 rxseq = ni->ni_rxseq; 222 ni->ni_rxseq = 223 le16toh(*(u_int16_t *)wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 224 /* TODO: fragment */ 225 if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) && 226 rxseq == ni->ni_rxseq) { 227 /* duplicate, silently discarded */ 228 ic->ic_stats.is_rx_dup++; /* XXX per-station stat */ 229 goto out; 230 } 231 ni->ni_inact = 0; 232 } 233 234 if (ic->ic_set_tim != NULL && 235 (wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) 236 && ni->ni_pwrsave == 0) { 237 /* turn on power save mode */ 238 239 if (ifp->if_flags & IFF_DEBUG) 240 printf("%s: power save mode on for %s\n", 241 ifp->if_xname, ether_sprintf(wh->i_addr2)); 242 243 ni->ni_pwrsave = IEEE80211_PS_SLEEP; 244 } 245 if (ic->ic_set_tim != NULL && 246 (wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) == 0 && 247 ni->ni_pwrsave != 0) { 248 /* turn off power save mode, dequeue stored packets */ 249 250 ni->ni_pwrsave = 0; 251 if (ic->ic_set_tim) 252 ic->ic_set_tim(ic, ni->ni_associd, 0); 253 254 if (ifp->if_flags & IFF_DEBUG) 255 printf("%s: power save mode off for %s\n", 256 ifp->if_xname, ether_sprintf(wh->i_addr2)); 257 258 while (!IF_IS_EMPTY(&ni->ni_savedq)) { 259 struct mbuf *m; 260 IF_DEQUEUE(&ni->ni_savedq, m); 261 IF_ENQUEUE(&ic->ic_pwrsaveq, m); 262 (*ifp->if_start)(ifp); 263 } 264 } 265 266 switch (type) { 267 case IEEE80211_FC0_TYPE_DATA: 268 switch (ic->ic_opmode) { 269 case IEEE80211_M_STA: 270 if (dir != IEEE80211_FC1_DIR_FROMDS) { 271 ic->ic_stats.is_rx_wrongdir++; 272 goto out; 273 } 274 if ((ifp->if_flags & IFF_SIMPLEX) && 275 IEEE80211_IS_MULTICAST(wh->i_addr1) && 276 IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_myaddr)) { 277 /* 278 * In IEEE802.11 network, multicast packet 279 * sent from me is broadcasted from AP. 280 * It should be silently discarded for 281 * SIMPLEX interface. 282 */ 283 ic->ic_stats.is_rx_mcastecho++; 284 goto out; 285 } 286 break; 287 case IEEE80211_M_IBSS: 288 case IEEE80211_M_AHDEMO: 289 if (dir != IEEE80211_FC1_DIR_NODS) { 290 ic->ic_stats.is_rx_wrongdir++; 291 goto out; 292 } 293 break; 294 case IEEE80211_M_HOSTAP: 295 if (dir != IEEE80211_FC1_DIR_TODS) { 296 ic->ic_stats.is_rx_wrongdir++; 297 goto out; 298 } 299 /* check if source STA is associated */ 300 if (ni == ic->ic_bss) { 301 IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT, 302 ("%s: data from unknown src %s\n", 303 __func__, ether_sprintf(wh->i_addr2))); 304 /* NB: caller deals with reference */ 305 ni = ieee80211_dup_bss(ic, wh->i_addr2); 306 if (ni != NULL) { 307 IEEE80211_SEND_MGMT(ic, ni, 308 IEEE80211_FC0_SUBTYPE_DEAUTH, 309 IEEE80211_REASON_NOT_AUTHED); 310 ieee80211_free_node(ic, ni); 311 } 312 ic->ic_stats.is_rx_notassoc++; 313 goto err; 314 } 315 if (ni->ni_associd == 0) { 316 IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT, 317 ("%s: data from unassoc src %s\n", 318 __func__, ether_sprintf(wh->i_addr2))); 319 IEEE80211_SEND_MGMT(ic, ni, 320 IEEE80211_FC0_SUBTYPE_DISASSOC, 321 IEEE80211_REASON_NOT_ASSOCED); 322 ieee80211_unref_node(&ni); 323 ic->ic_stats.is_rx_notassoc++; 324 goto err; 325 } 326 break; 327 case IEEE80211_M_MONITOR: 328 break; 329 } 330 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 331 if (ic->ic_flags & IEEE80211_F_WEPON) { 332 m = ieee80211_wep_crypt(ifp, m, 0); 333 if (m == NULL) { 334 ic->ic_stats.is_rx_wepfail++; 335 goto err; 336 } 337 wh = mtod(m, struct ieee80211_frame *); 338 } else { 339 ic->ic_stats.is_rx_nowep++; 340 goto out; 341 } 342 } 343 #if NBPFILTER > 0 344 /* copy to listener after decrypt */ 345 if (ic->ic_rawbpf) 346 bpf_mtap(ic->ic_rawbpf, m); 347 #endif 348 m = ieee80211_decap(ifp, m); 349 if (m == NULL) { 350 IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT, 351 ("%s: decapsulation error for src %s\n", 352 __func__, ether_sprintf(wh->i_addr2))); 353 ic->ic_stats.is_rx_decap++; 354 goto err; 355 } 356 ifp->if_ipackets++; 357 358 /* perform as a bridge within the AP */ 359 m1 = NULL; 360 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 361 eh = mtod(m, struct ether_header *); 362 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 363 m1 = m_copypacket(m, M_DONTWAIT); 364 if (m1 == NULL) 365 ifp->if_oerrors++; 366 else 367 m1->m_flags |= M_MCAST; 368 } else { 369 ni = ieee80211_find_node(ic, eh->ether_dhost); 370 if (ni != NULL) { 371 if (ni->ni_associd != 0) { 372 m1 = m; 373 m = NULL; 374 } 375 ieee80211_free_node(ic, ni); 376 } 377 } 378 if (m1 != NULL) { 379 #ifdef ALTQ 380 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 381 altq_etherclassify(&ifp->if_snd, m1, 382 &pktattr); 383 #endif 384 len = m1->m_pkthdr.len; 385 IF_ENQUEUE(&ifp->if_snd, m1); 386 if (m != NULL) 387 ifp->if_omcasts++; 388 ifp->if_obytes += len; 389 } 390 } 391 if (m != NULL) { 392 #if NBPFILTER > 0 393 /* 394 * If we forward packet into transmitter of the AP, 395 * we don't need to duplicate for DLT_EN10MB. 396 */ 397 if (ifp->if_bpf && m1 == NULL) 398 bpf_mtap(ifp->if_bpf, m); 399 #endif 400 (*ifp->if_input)(ifp, m); 401 } 402 return; 403 404 case IEEE80211_FC0_TYPE_MGT: 405 if (dir != IEEE80211_FC1_DIR_NODS) { 406 ic->ic_stats.is_rx_wrongdir++; 407 goto err; 408 } 409 if (ic->ic_opmode == IEEE80211_M_AHDEMO) { 410 ic->ic_stats.is_rx_ahdemo_mgt++; 411 goto out; 412 } 413 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 414 415 /* drop frames without interest */ 416 if (ic->ic_state == IEEE80211_S_SCAN) { 417 if (subtype != IEEE80211_FC0_SUBTYPE_BEACON && 418 subtype != IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 419 ic->ic_stats.is_rx_mgtdiscard++; 420 goto out; 421 } 422 } else { 423 if (ic->ic_opmode != IEEE80211_M_IBSS && 424 subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 425 ic->ic_stats.is_rx_mgtdiscard++; 426 goto out; 427 } 428 } 429 430 #ifdef IEEE80211_DEBUG 431 if ((ieee80211_msg_debug(ic) && doprint(ic, subtype)) || 432 ieee80211_msg_dumppkts(ic)) { 433 if_printf(ifp, "received %s from %s rssi %d\n", 434 ieee80211_mgt_subtype_name[subtype 435 >> IEEE80211_FC0_SUBTYPE_SHIFT], 436 ether_sprintf(wh->i_addr2), rssi); 437 } 438 #endif 439 #if NBPFILTER > 0 440 if (ic->ic_rawbpf) 441 bpf_mtap(ic->ic_rawbpf, m); 442 #endif 443 (*ic->ic_recv_mgmt)(ic, m, ni, subtype, rssi, rstamp); 444 m_freem(m); 445 return; 446 447 case IEEE80211_FC0_TYPE_CTL: 448 ic->ic_stats.is_rx_ctl++; 449 if (ic->ic_opmode != IEEE80211_M_HOSTAP) 450 goto out; 451 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 452 if (subtype == IEEE80211_FC0_SUBTYPE_PS_POLL) { 453 /* XXX statistic */ 454 /* Dump out a single packet from the host */ 455 if (ifp->if_flags & IFF_DEBUG) 456 printf("%s: got power save probe from %s\n", 457 ifp->if_xname, 458 ether_sprintf(wh->i_addr2)); 459 ieee80211_recv_pspoll(ic, m, rssi, rstamp); 460 } 461 goto out; 462 default: 463 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 464 ("%s: bad frame type %x\n", __func__, type)); 465 /* should not come here */ 466 break; 467 } 468 err: 469 ifp->if_ierrors++; 470 out: 471 if (m != NULL) { 472 #if NBPFILTER > 0 473 if (ic->ic_rawbpf) 474 bpf_mtap(ic->ic_rawbpf, m); 475 #endif 476 m_freem(m); 477 } 478 } 479 480 struct mbuf * 481 ieee80211_decap(struct ifnet *ifp, struct mbuf *m) 482 { 483 struct ether_header *eh; 484 struct ieee80211_frame wh; 485 struct llc *llc; 486 487 if (m->m_len < sizeof(wh) + sizeof(*llc)) { 488 m = m_pullup(m, sizeof(wh) + sizeof(*llc)); 489 if (m == NULL) 490 return NULL; 491 } 492 memcpy(&wh, mtod(m, caddr_t), sizeof(wh)); 493 llc = (struct llc *)(mtod(m, caddr_t) + sizeof(wh)); 494 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 495 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 496 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0) { 497 m_adj(m, sizeof(wh) + sizeof(struct llc) - sizeof(*eh)); 498 llc = NULL; 499 } else { 500 m_adj(m, sizeof(wh) - sizeof(*eh)); 501 } 502 eh = mtod(m, struct ether_header *); 503 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 504 case IEEE80211_FC1_DIR_NODS: 505 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 506 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 507 break; 508 case IEEE80211_FC1_DIR_TODS: 509 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 510 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 511 break; 512 case IEEE80211_FC1_DIR_FROMDS: 513 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 514 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 515 break; 516 case IEEE80211_FC1_DIR_DSTODS: 517 /* not yet supported */ 518 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 519 ("%s: discard DS to DS frame\n", __func__)); 520 m_freem(m); 521 return NULL; 522 } 523 #ifdef ALIGNED_POINTER 524 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), u_int32_t)) { 525 struct mbuf *n, *n0, **np; 526 caddr_t newdata; 527 int off, pktlen; 528 529 n0 = NULL; 530 np = &n0; 531 off = 0; 532 pktlen = m->m_pkthdr.len; 533 while (pktlen > off) { 534 if (n0 == NULL) { 535 MGETHDR(n, M_DONTWAIT, MT_DATA); 536 if (n == NULL) { 537 m_freem(m); 538 return NULL; 539 } 540 #ifdef __FreeBSD__ 541 M_MOVE_PKTHDR(n, m); 542 #else 543 M_COPY_PKTHDR(n, m); 544 #endif 545 n->m_len = MHLEN; 546 } else { 547 MGET(n, M_DONTWAIT, MT_DATA); 548 if (n == NULL) { 549 m_freem(m); 550 m_freem(n0); 551 return NULL; 552 } 553 n->m_len = MLEN; 554 } 555 if (pktlen - off >= MINCLSIZE) { 556 MCLGET(n, M_DONTWAIT); 557 if (n->m_flags & M_EXT) 558 n->m_len = n->m_ext.ext_size; 559 } 560 if (n0 == NULL) { 561 newdata = 562 (caddr_t)ALIGN(n->m_data + sizeof(*eh)) - 563 sizeof(*eh); 564 n->m_len -= newdata - n->m_data; 565 n->m_data = newdata; 566 } 567 if (n->m_len > pktlen - off) 568 n->m_len = pktlen - off; 569 m_copydata(m, off, n->m_len, mtod(n, caddr_t)); 570 off += n->m_len; 571 *np = n; 572 np = &n->m_next; 573 } 574 m_freem(m); 575 m = n0; 576 } 577 #endif /* ALIGNED_POINTER */ 578 if (llc != NULL) { 579 eh = mtod(m, struct ether_header *); 580 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 581 } 582 return m; 583 } 584 585 /* 586 * Install received rate set information in the node's state block. 587 */ 588 static int 589 ieee80211_setup_rates(struct ieee80211com *ic, struct ieee80211_node *ni, 590 u_int8_t *rates, u_int8_t *xrates, int flags) 591 { 592 struct ieee80211_rateset *rs = &ni->ni_rates; 593 594 memset(rs, 0, sizeof(*rs)); 595 rs->rs_nrates = rates[1]; 596 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 597 if (xrates != NULL) { 598 u_int8_t nxrates; 599 /* 600 * Tack on 11g extended supported rate element. 601 */ 602 nxrates = xrates[1]; 603 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 604 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 605 IEEE80211_DPRINTF(ic, IEEE80211_MSG_XRATE, 606 ("%s: extended rate set too large;" 607 " only using %u of %u rates\n", 608 __func__, nxrates, xrates[1])); 609 ic->ic_stats.is_rx_rstoobig++; 610 } 611 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 612 rs->rs_nrates += nxrates; 613 } 614 return ieee80211_fix_rate(ic, ni, flags); 615 } 616 617 /* Verify the existence and length of __elem or get out. */ 618 #define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen) do { \ 619 if ((__elem) == NULL) { \ 620 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ELEMID, \ 621 ("%s: no " #__elem "in %s frame\n", \ 622 __func__, ieee80211_mgt_subtype_name[subtype >> \ 623 IEEE80211_FC0_SUBTYPE_SHIFT])); \ 624 ic->ic_stats.is_rx_elem_missing++; \ 625 return; \ 626 } \ 627 if ((__elem)[1] > (__maxlen)) { \ 628 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ELEMID, \ 629 ("%s: bad " #__elem " len %d in %s frame from %s\n",\ 630 __func__, (__elem)[1], \ 631 ieee80211_mgt_subtype_name[subtype >> \ 632 IEEE80211_FC0_SUBTYPE_SHIFT], \ 633 ether_sprintf(wh->i_addr2))); \ 634 ic->ic_stats.is_rx_elem_toobig++; \ 635 return; \ 636 } \ 637 } while (0) 638 639 #define IEEE80211_VERIFY_LENGTH(_len, _minlen) do { \ 640 if ((_len) < (_minlen)) { \ 641 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ELEMID, \ 642 ("%s: %s frame too short from %s\n", \ 643 __func__, \ 644 ieee80211_mgt_subtype_name[subtype >> \ 645 IEEE80211_FC0_SUBTYPE_SHIFT], \ 646 ether_sprintf(wh->i_addr2))); \ 647 ic->ic_stats.is_rx_elem_toosmall++; \ 648 return; \ 649 } \ 650 } while (0) 651 652 static void 653 ieee80211_auth_open(struct ieee80211com *ic, struct ieee80211_frame *wh, 654 struct ieee80211_node *ni, int rssi, u_int32_t rstamp, u_int16_t seq, 655 u_int16_t status) 656 { 657 int allocbs; 658 switch (ic->ic_opmode) { 659 case IEEE80211_M_IBSS: 660 if (ic->ic_state != IEEE80211_S_RUN || 661 seq != IEEE80211_AUTH_OPEN_REQUEST) { 662 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 663 ("%s: discard auth from %s; state %u, seq %u\n", 664 __func__, ether_sprintf(wh->i_addr2), 665 ic->ic_state, seq)); 666 ic->ic_stats.is_rx_bad_auth++; 667 return; 668 } 669 ieee80211_new_state(ic, IEEE80211_S_AUTH, 670 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 671 break; 672 673 case IEEE80211_M_AHDEMO: 674 /* should not come here */ 675 break; 676 677 case IEEE80211_M_HOSTAP: 678 if (ic->ic_state != IEEE80211_S_RUN || 679 seq != IEEE80211_AUTH_OPEN_REQUEST) { 680 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 681 ("%s: discard auth from %s; state %u, seq %u\n", 682 __func__, ether_sprintf(wh->i_addr2), 683 ic->ic_state, seq)); 684 ic->ic_stats.is_rx_bad_auth++; 685 return; 686 } 687 if (ni == ic->ic_bss) { 688 ni = ieee80211_alloc_node(ic, wh->i_addr2); 689 if (ni == NULL) { 690 ic->ic_stats.is_rx_nodealloc++; 691 return; 692 } 693 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); 694 ni->ni_rssi = rssi; 695 ni->ni_rstamp = rstamp; 696 ni->ni_chan = ic->ic_bss->ni_chan; 697 allocbs = 1; 698 } else 699 allocbs = 0; 700 IEEE80211_SEND_MGMT(ic, ni, 701 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 702 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 703 ("station %s %s authenticated (open)\n", 704 ether_sprintf(ni->ni_macaddr), 705 (allocbs ? "newly" : "already"))); 706 break; 707 708 case IEEE80211_M_STA: 709 if (ic->ic_state != IEEE80211_S_AUTH || 710 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 711 ic->ic_stats.is_rx_bad_auth++; 712 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 713 ("%s: discard auth from %s; state %u, seq %u\n", 714 __func__, ether_sprintf(wh->i_addr2), 715 ic->ic_state, seq)); 716 return; 717 } 718 if (status != 0) { 719 IEEE80211_DPRINTF(ic, 720 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 721 ("open authentication failed (reason %d) for %s\n", 722 status, 723 ether_sprintf(wh->i_addr3))); 724 if (ni != ic->ic_bss) 725 ni->ni_fails++; 726 ic->ic_stats.is_rx_auth_fail++; 727 return; 728 } 729 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 730 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 731 break; 732 case IEEE80211_M_MONITOR: 733 break; 734 } 735 } 736 737 /* TBD send appropriate responses on error? */ 738 static void 739 ieee80211_auth_shared(struct ieee80211com *ic, struct ieee80211_frame *wh, 740 u_int8_t *frm, u_int8_t *efrm, struct ieee80211_node *ni, int rssi, 741 u_int32_t rstamp, u_int16_t seq, u_int16_t status) 742 { 743 u_int8_t *challenge = NULL; 744 int allocbs, i; 745 746 if ((ic->ic_flags & IEEE80211_F_WEPON) == 0) { 747 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 748 ("%s: WEP is off\n", __func__)); 749 return; 750 } 751 752 if (frm + 1 < efrm) { 753 if (frm[1] + 2 > efrm - frm) { 754 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 755 ("%s: elt %d %d bytes too long\n", __func__, 756 frm[0], (frm[1] + 2) - (int)(efrm - frm))); 757 ic->ic_stats.is_rx_bad_auth++; 758 return; 759 } 760 if (*frm == IEEE80211_ELEMID_CHALLENGE) 761 challenge = frm; 762 frm += frm[1] + 2; 763 } 764 switch (seq) { 765 case IEEE80211_AUTH_SHARED_CHALLENGE: 766 case IEEE80211_AUTH_SHARED_RESPONSE: 767 if (challenge == NULL) { 768 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 769 ("%s: no challenge sent\n", __func__)); 770 ic->ic_stats.is_rx_bad_auth++; 771 return; 772 } 773 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 774 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 775 ("%s: bad challenge len %d\n", 776 __func__, challenge[1])); 777 ic->ic_stats.is_rx_bad_auth++; 778 return; 779 } 780 default: 781 break; 782 } 783 switch (ic->ic_opmode) { 784 case IEEE80211_M_MONITOR: 785 case IEEE80211_M_AHDEMO: 786 case IEEE80211_M_IBSS: 787 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 788 ("%s: unexpected operating mode\n", __func__)); 789 return; 790 case IEEE80211_M_HOSTAP: 791 if (ic->ic_state != IEEE80211_S_RUN) { 792 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 793 ("%s: not running\n", __func__)); 794 return; 795 } 796 switch (seq) { 797 case IEEE80211_AUTH_SHARED_REQUEST: 798 if (ni == ic->ic_bss) { 799 ni = ieee80211_alloc_node(ic, wh->i_addr2); 800 if (ni == NULL) { 801 ic->ic_stats.is_rx_nodealloc++; 802 return; 803 } 804 IEEE80211_ADDR_COPY(ni->ni_bssid, 805 ic->ic_bss->ni_bssid); 806 ni->ni_rssi = rssi; 807 ni->ni_rstamp = rstamp; 808 ni->ni_chan = ic->ic_bss->ni_chan; 809 allocbs = 1; 810 } else 811 allocbs = 0; 812 if (ni->ni_challenge == NULL) 813 ni->ni_challenge = (u_int32_t*)malloc( 814 IEEE80211_CHALLENGE_LEN, M_DEVBUF, 815 M_NOWAIT); 816 if (ni->ni_challenge == NULL) { 817 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 818 ("%s: challenge alloc failed\n", 819 __func__)); 820 /* XXX statistic */ 821 return; 822 } 823 for (i = IEEE80211_CHALLENGE_LEN / sizeof(u_int32_t); 824 --i >= 0; ) 825 ni->ni_challenge[i] = arc4random(); 826 IEEE80211_DPRINTF(ic, 827 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 828 ("shared key %sauth request from station %s\n", 829 (allocbs ? "" : "re"), 830 ether_sprintf(ni->ni_macaddr))); 831 break; 832 case IEEE80211_AUTH_SHARED_RESPONSE: 833 if (ni == ic->ic_bss) { 834 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 835 ("%s: unknown STA\n", __func__)); 836 return; 837 } 838 if (ni->ni_challenge == NULL) { 839 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 840 ("%s: no challenge recorded\n", 841 __func__)); 842 ic->ic_stats.is_rx_bad_auth++; 843 return; 844 } 845 if (memcmp(ni->ni_challenge, &challenge[2], 846 challenge[1]) != 0) { 847 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 848 ("%s: challenge mismatch\n", __func__)); 849 ic->ic_stats.is_rx_auth_fail++; 850 return; 851 } 852 IEEE80211_DPRINTF(ic, 853 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 854 ("station %s authenticated (shared key)\n", 855 ether_sprintf(ni->ni_macaddr))); 856 break; 857 default: 858 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 859 ("%s: bad shared key auth seq %d from %s\n", 860 __func__, seq, ether_sprintf(wh->i_addr2))); 861 ic->ic_stats.is_rx_bad_auth++; 862 return; 863 } 864 IEEE80211_SEND_MGMT(ic, ni, 865 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 866 break; 867 868 case IEEE80211_M_STA: 869 if (ic->ic_state != IEEE80211_S_AUTH) 870 return; 871 switch (seq) { 872 case IEEE80211_AUTH_SHARED_PASS: 873 if (ni->ni_challenge != NULL) { 874 FREE(ni->ni_challenge, M_DEVBUF); 875 ni->ni_challenge = NULL; 876 } 877 if (status != 0) { 878 IEEE80211_DPRINTF(ic, 879 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 880 ("%s: auth failed (reason %d) for %s\n", 881 __func__, status, 882 ether_sprintf(wh->i_addr3))); 883 if (ni != ic->ic_bss) 884 ni->ni_fails++; 885 ic->ic_stats.is_rx_auth_fail++; 886 return; 887 } 888 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 889 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 890 break; 891 case IEEE80211_AUTH_SHARED_CHALLENGE: 892 if (ni->ni_challenge == NULL) 893 ni->ni_challenge = (u_int32_t*)malloc( 894 challenge[1], M_DEVBUF, M_NOWAIT); 895 if (ni->ni_challenge == NULL) { 896 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 897 ("%s: challenge alloc failed\n", __func__)); 898 /* XXX statistic */ 899 return; 900 } 901 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 902 IEEE80211_SEND_MGMT(ic, ni, 903 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 904 break; 905 default: 906 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 907 ("%s: bad seq %d from %s\n", __func__, seq, 908 ether_sprintf(wh->i_addr2))); 909 ic->ic_stats.is_rx_bad_auth++; 910 return; 911 } 912 break; 913 } 914 } 915 916 void 917 ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0, 918 struct ieee80211_node *ni, 919 int subtype, int rssi, u_int32_t rstamp) 920 { 921 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 922 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 923 struct ieee80211_frame *wh; 924 u_int8_t *frm, *efrm; 925 u_int8_t *ssid, *rates, *xrates; 926 int reassoc, resp, newassoc, allocbs; 927 928 wh = mtod(m0, struct ieee80211_frame *); 929 frm = (u_int8_t *)&wh[1]; 930 efrm = mtod(m0, u_int8_t *) + m0->m_len; 931 switch (subtype) { 932 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 933 case IEEE80211_FC0_SUBTYPE_BEACON: { 934 u_int8_t *tstamp, *bintval, *capinfo, *country; 935 u_int8_t chan, bchan, fhindex, erp; 936 u_int16_t fhdwell; 937 938 if (ic->ic_opmode != IEEE80211_M_IBSS && 939 ic->ic_state != IEEE80211_S_SCAN) { 940 /* XXX: may be useful for background scan */ 941 return; 942 } 943 944 /* 945 * beacon/probe response frame format 946 * [8] time stamp 947 * [2] beacon interval 948 * [2] capability information 949 * [tlv] ssid 950 * [tlv] supported rates 951 * [tlv] country information 952 * [tlv] parameter set (FH/DS) 953 * [tlv] erp information 954 * [tlv] extended supported rates 955 */ 956 IEEE80211_VERIFY_LENGTH(efrm - frm, 12); 957 tstamp = frm; frm += 8; 958 bintval = frm; frm += 2; 959 capinfo = frm; frm += 2; 960 ssid = rates = xrates = country = NULL; 961 bchan = ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan); 962 chan = bchan; 963 fhdwell = 0; 964 fhindex = 0; 965 erp = 0; 966 while (frm < efrm) { 967 switch (*frm) { 968 case IEEE80211_ELEMID_SSID: 969 ssid = frm; 970 break; 971 case IEEE80211_ELEMID_RATES: 972 rates = frm; 973 break; 974 case IEEE80211_ELEMID_COUNTRY: 975 country = frm; 976 break; 977 case IEEE80211_ELEMID_FHPARMS: 978 if (ic->ic_phytype == IEEE80211_T_FH) { 979 fhdwell = (frm[3] << 8) | frm[2]; 980 chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 981 fhindex = frm[6]; 982 } 983 break; 984 case IEEE80211_ELEMID_DSPARMS: 985 /* 986 * XXX hack this since depending on phytype 987 * is problematic for multi-mode devices. 988 */ 989 if (ic->ic_phytype != IEEE80211_T_FH) 990 chan = frm[2]; 991 break; 992 case IEEE80211_ELEMID_TIM: 993 break; 994 case IEEE80211_ELEMID_IBSSPARMS: 995 break; 996 case IEEE80211_ELEMID_XRATES: 997 xrates = frm; 998 break; 999 case IEEE80211_ELEMID_ERP: 1000 if (frm[1] != 1) { 1001 IEEE80211_DPRINTF(ic, 1002 IEEE80211_MSG_ELEMID, 1003 ("%s: invalid ERP element; " 1004 "length %u, expecting 1\n", 1005 __func__, frm[1])); 1006 ic->ic_stats.is_rx_elem_toobig++; 1007 break; 1008 } 1009 erp = frm[2]; 1010 break; 1011 default: 1012 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ELEMID, 1013 ("%s: element id %u/len %u ignored\n", 1014 __func__, *frm, frm[1])); 1015 ic->ic_stats.is_rx_elem_unknown++; 1016 break; 1017 } 1018 frm += frm[1] + 2; 1019 } 1020 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 1021 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); 1022 if ( 1023 #if IEEE80211_CHAN_MAX < 255 1024 chan > IEEE80211_CHAN_MAX || 1025 #endif 1026 isclr(ic->ic_chan_active, chan)) { 1027 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ELEMID, 1028 ("%s: ignore %s with invalid channel %u\n", 1029 __func__, 1030 ISPROBE(subtype) ? "probe response" : "beacon", 1031 chan)); 1032 ic->ic_stats.is_rx_badchan++; 1033 return; 1034 } 1035 if (chan != bchan && ic->ic_phytype != IEEE80211_T_FH) { 1036 /* 1037 * Frame was received on a channel different from the 1038 * one indicated in the DS params element id; 1039 * silently discard it. 1040 * 1041 * NB: this can happen due to signal leakage. 1042 * But we should take it for FH phy because 1043 * the rssi value should be correct even for 1044 * different hop pattern in FH. 1045 */ 1046 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ELEMID, 1047 ("%s: ignore %s on channel %u marked " 1048 "for channel %u\n", __func__, 1049 ISPROBE(subtype) ? "probe response" : "beacon", 1050 bchan, chan)); 1051 ic->ic_stats.is_rx_chanmismatch++; 1052 return; 1053 } 1054 1055 /* 1056 * Use mac and channel for lookup so we collect all 1057 * potential AP's when scanning. Otherwise we may 1058 * see the same AP on multiple channels and will only 1059 * record the last one. We could filter APs here based 1060 * on rssi, etc. but leave that to the end of the scan 1061 * so we can keep the selection criteria in one spot. 1062 * This may result in a bloat of the scanned AP list but 1063 * it shouldn't be too much. 1064 */ 1065 ni = ieee80211_lookup_node(ic, wh->i_addr2, 1066 &ic->ic_channels[chan]); 1067 #ifdef IEEE80211_DEBUG 1068 if (ieee80211_debug && 1069 (ni == NULL || ic->ic_state == IEEE80211_S_SCAN)) { 1070 printf("%s: %s%s on chan %u (bss chan %u) ", 1071 __func__, (ni == NULL ? "new " : ""), 1072 ISPROBE(subtype) ? "probe response" : "beacon", 1073 chan, bchan); 1074 ieee80211_print_essid(ssid + 2, ssid[1]); 1075 printf(" from %s\n", ether_sprintf(wh->i_addr2)); 1076 printf("%s: caps 0x%x bintval %u erp 0x%x\n", 1077 __func__, le16toh(*(u_int16_t *)capinfo), 1078 le16toh(*(u_int16_t *)bintval), erp); 1079 if (country) { 1080 int i; 1081 printf("%s: country info", __func__); 1082 for (i = 0; i < country[1]; i++) 1083 printf(" %02x", country[i+2]); 1084 printf("\n"); 1085 } 1086 } 1087 #endif 1088 if (ni == NULL) { 1089 ni = ieee80211_alloc_node(ic, wh->i_addr2); 1090 if (ni == NULL) 1091 return; 1092 ni->ni_esslen = ssid[1]; 1093 memset(ni->ni_essid, 0, sizeof(ni->ni_essid)); 1094 memcpy(ni->ni_essid, ssid + 2, ssid[1]); 1095 allocbs = 1; 1096 } else if (ssid[1] != 0 && 1097 (ISPROBE(subtype) || ni->ni_esslen == 0)) { 1098 /* 1099 * Update ESSID at probe response to adopt hidden AP by 1100 * Lucent/Cisco, which announces null ESSID in beacon. 1101 */ 1102 ni->ni_esslen = ssid[1]; 1103 memset(ni->ni_essid, 0, sizeof(ni->ni_essid)); 1104 memcpy(ni->ni_essid, ssid + 2, ssid[1]); 1105 allocbs = 0; 1106 } else 1107 allocbs = 0; 1108 IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3); 1109 ni->ni_rssi = rssi; 1110 ni->ni_rstamp = rstamp; 1111 memcpy(ni->ni_tstamp, tstamp, sizeof(ni->ni_tstamp)); 1112 ni->ni_intval = le16toh(*(u_int16_t *)bintval); 1113 ni->ni_capinfo = le16toh(*(u_int16_t *)capinfo); 1114 /* XXX validate channel # */ 1115 ni->ni_chan = &ic->ic_channels[chan]; 1116 ni->ni_fhdwell = fhdwell; 1117 ni->ni_fhindex = fhindex; 1118 ni->ni_erp = erp; 1119 /* NB: must be after ni_chan is setup */ 1120 ieee80211_setup_rates(ic, ni, rates, xrates, IEEE80211_F_DOSORT); 1121 /* 1122 * When scanning we record results (nodes) with a zero 1123 * refcnt. Otherwise we want to hold the reference for 1124 * ibss neighbors so the nodes don't get released prematurely. 1125 * Anything else can be discarded (XXX and should be handled 1126 * above so we don't do so much work). 1127 */ 1128 if (ic->ic_state == IEEE80211_S_SCAN) 1129 ieee80211_unref_node(&ni); /* NB: do not free */ 1130 else if (ic->ic_opmode == IEEE80211_M_IBSS && 1131 allocbs && ISPROBE(subtype)) { 1132 /* 1133 * Fake an association so the driver can setup it's 1134 * private state. The rate set has been setup above; 1135 * there is no handshake as in ap/station operation. 1136 */ 1137 if (ic->ic_newassoc) 1138 (*ic->ic_newassoc)(ic, ni, 1); 1139 /* NB: hold reference */ 1140 } else { 1141 /* XXX optimize to avoid work done above */ 1142 ieee80211_free_node(ic, ni); 1143 } 1144 break; 1145 } 1146 1147 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: { 1148 u_int8_t rate; 1149 1150 if (ic->ic_opmode == IEEE80211_M_STA) 1151 return; 1152 if (ic->ic_state != IEEE80211_S_RUN) 1153 return; 1154 1155 /* 1156 * prreq frame format 1157 * [tlv] ssid 1158 * [tlv] supported rates 1159 * [tlv] extended supported rates 1160 */ 1161 ssid = rates = xrates = NULL; 1162 while (frm < efrm) { 1163 switch (*frm) { 1164 case IEEE80211_ELEMID_SSID: 1165 ssid = frm; 1166 break; 1167 case IEEE80211_ELEMID_RATES: 1168 rates = frm; 1169 break; 1170 case IEEE80211_ELEMID_XRATES: 1171 xrates = frm; 1172 break; 1173 } 1174 frm += frm[1] + 2; 1175 } 1176 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 1177 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); 1178 if (ssid[1] != 0 && 1179 (ssid[1] != ic->ic_bss->ni_esslen || 1180 memcmp(ssid + 2, ic->ic_bss->ni_essid, ic->ic_bss->ni_esslen) != 0)) { 1181 #ifdef IEEE80211_DEBUG 1182 if (ieee80211_debug) { 1183 printf("%s: ssid mismatch ", __func__); 1184 ieee80211_print_essid(ssid + 2, ssid[1]); 1185 printf(" from %s\n", ether_sprintf(wh->i_addr2)); 1186 } 1187 #endif 1188 ic->ic_stats.is_rx_ssidmismatch++; 1189 return; 1190 } 1191 1192 if (ni == ic->ic_bss) { 1193 ni = ieee80211_dup_bss(ic, wh->i_addr2); 1194 if (ni == NULL) 1195 return; 1196 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1197 ("%s: new probe req from %s\n", 1198 __func__, ether_sprintf(wh->i_addr2))); 1199 allocbs = 1; 1200 } else 1201 allocbs = 0; 1202 ni->ni_rssi = rssi; 1203 ni->ni_rstamp = rstamp; 1204 rate = ieee80211_setup_rates(ic, ni, rates, xrates, 1205 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE 1206 | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1207 if (rate & IEEE80211_RATE_BASIC) { 1208 IEEE80211_DPRINTF(ic, IEEE80211_MSG_XRATE, 1209 ("%s: rate negotiation failed: %s\n", 1210 __func__,ether_sprintf(wh->i_addr2))); 1211 } else { 1212 IEEE80211_SEND_MGMT(ic, ni, 1213 IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0); 1214 } 1215 if (allocbs) 1216 ieee80211_free_node(ic, ni); 1217 break; 1218 } 1219 1220 case IEEE80211_FC0_SUBTYPE_AUTH: { 1221 u_int16_t algo, seq, status; 1222 /* 1223 * auth frame format 1224 * [2] algorithm 1225 * [2] sequence 1226 * [2] status 1227 * [tlv*] challenge 1228 */ 1229 IEEE80211_VERIFY_LENGTH(efrm - frm, 6); 1230 algo = le16toh(*(u_int16_t *)frm); 1231 seq = le16toh(*(u_int16_t *)(frm + 2)); 1232 status = le16toh(*(u_int16_t *)(frm + 4)); 1233 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1234 ("%s: algorithm %d seq %d from %s\n", 1235 __func__, algo, seq, ether_sprintf(wh->i_addr2))); 1236 1237 if (algo == IEEE80211_AUTH_ALG_SHARED) 1238 ieee80211_auth_shared(ic, wh, frm + 6, efrm, ni, rssi, 1239 rstamp, seq, status); 1240 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1241 ieee80211_auth_open(ic, wh, ni, rssi, rstamp, seq, 1242 status); 1243 else { 1244 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1245 ("%s: unsupported auth algorithm %d from %s\n", 1246 __func__, algo, ether_sprintf(wh->i_addr2))); 1247 ic->ic_stats.is_rx_auth_unsupported++; 1248 return; 1249 } 1250 break; 1251 } 1252 1253 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1254 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1255 u_int16_t capinfo, bintval; 1256 1257 if (ic->ic_opmode != IEEE80211_M_HOSTAP || 1258 (ic->ic_state != IEEE80211_S_RUN)) 1259 return; 1260 1261 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1262 reassoc = 1; 1263 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1264 } else { 1265 reassoc = 0; 1266 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1267 } 1268 /* 1269 * asreq frame format 1270 * [2] capability information 1271 * [2] listen interval 1272 * [6*] current AP address (reassoc only) 1273 * [tlv] ssid 1274 * [tlv] supported rates 1275 * [tlv] extended supported rates 1276 */ 1277 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4)); 1278 if (!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid)) { 1279 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1280 ("%s: ignore assoc request with bss %s not " 1281 "our own\n", 1282 __func__, ether_sprintf(wh->i_addr2))); 1283 ic->ic_stats.is_rx_assoc_bss++; 1284 return; 1285 } 1286 capinfo = le16toh(*(u_int16_t *)frm); frm += 2; 1287 bintval = le16toh(*(u_int16_t *)frm); frm += 2; 1288 if (reassoc) 1289 frm += 6; /* ignore current AP info */ 1290 ssid = rates = xrates = NULL; 1291 while (frm < efrm) { 1292 switch (*frm) { 1293 case IEEE80211_ELEMID_SSID: 1294 ssid = frm; 1295 break; 1296 case IEEE80211_ELEMID_RATES: 1297 rates = frm; 1298 break; 1299 case IEEE80211_ELEMID_XRATES: 1300 xrates = frm; 1301 break; 1302 } 1303 frm += frm[1] + 2; 1304 } 1305 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 1306 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); 1307 if (ssid[1] != ic->ic_bss->ni_esslen || 1308 memcmp(ssid + 2, ic->ic_bss->ni_essid, ssid[1]) != 0) { 1309 #ifdef IEEE80211_DEBUG 1310 if (ieee80211_debug) { 1311 printf("%s: ssid mismatch ", __func__); 1312 ieee80211_print_essid(ssid + 2, ssid[1]); 1313 printf(" from %s\n", ether_sprintf(wh->i_addr2)); 1314 } 1315 #endif 1316 ic->ic_stats.is_rx_ssidmismatch++; 1317 return; 1318 } 1319 if (ni == ic->ic_bss) { 1320 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1321 ("%s: deny %sassoc from %s, not authenticated\n", 1322 __func__, reassoc ? "re" : "", 1323 ether_sprintf(wh->i_addr2))); 1324 ni = ieee80211_dup_bss(ic, wh->i_addr2); 1325 if (ni != NULL) { 1326 IEEE80211_SEND_MGMT(ic, ni, 1327 IEEE80211_FC0_SUBTYPE_DEAUTH, 1328 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1329 ieee80211_free_node(ic, ni); 1330 } 1331 ic->ic_stats.is_rx_assoc_notauth++; 1332 return; 1333 } 1334 /* discard challenge after association */ 1335 if (ni->ni_challenge != NULL) { 1336 FREE(ni->ni_challenge, M_DEVBUF); 1337 ni->ni_challenge = NULL; 1338 } 1339 /* XXX per-node cipher suite */ 1340 /* XXX some stations use the privacy bit for handling APs 1341 that suport both encrypted and unencrypted traffic */ 1342 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0 || 1343 (capinfo & IEEE80211_CAPINFO_PRIVACY) != 1344 ((ic->ic_flags & IEEE80211_F_WEPON) ? 1345 IEEE80211_CAPINFO_PRIVACY : 0)) { 1346 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1347 ("%s: capability mismatch %x for %s\n", 1348 __func__, capinfo, ether_sprintf(wh->i_addr2))); 1349 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1350 ni->ni_associd = 0; 1351 IEEE80211_SEND_MGMT(ic, ni, resp, 1352 IEEE80211_STATUS_CAPINFO); 1353 ic->ic_stats.is_rx_assoc_capmismatch++; 1354 return; 1355 } 1356 ieee80211_setup_rates(ic, ni, rates, xrates, 1357 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1358 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1359 if (ni->ni_rates.rs_nrates == 0) { 1360 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1361 ("%s: rate mismatch for %s\n", 1362 __func__, ether_sprintf(wh->i_addr2))); 1363 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1364 ni->ni_associd = 0; 1365 IEEE80211_SEND_MGMT(ic, ni, resp, 1366 IEEE80211_STATUS_BASIC_RATE); 1367 ic->ic_stats.is_rx_assoc_norate++; 1368 return; 1369 } 1370 ni->ni_rssi = rssi; 1371 ni->ni_rstamp = rstamp; 1372 ni->ni_intval = bintval; 1373 ni->ni_capinfo = capinfo; 1374 ni->ni_chan = ic->ic_bss->ni_chan; 1375 ni->ni_fhdwell = ic->ic_bss->ni_fhdwell; 1376 ni->ni_fhindex = ic->ic_bss->ni_fhindex; 1377 if (ni->ni_associd == 0) { 1378 u_int16_t aid; 1379 1380 /* 1381 * It would be clever to search the bitmap 1382 * more efficiently, but this will do for now. 1383 */ 1384 for (aid = 1; aid < ic->ic_max_aid; aid++) { 1385 if (!IEEE80211_AID_ISSET(aid, 1386 ic->ic_aid_bitmap)) 1387 break; 1388 } 1389 1390 if (ic->ic_bss->ni_associd >= ic->ic_max_aid) { 1391 IEEE80211_SEND_MGMT(ic, ni, resp, 1392 IEEE80211_REASON_ASSOC_TOOMANY); 1393 return; 1394 } else { 1395 ni->ni_associd = aid | 0xc000; 1396 IEEE80211_AID_SET(ni->ni_associd, 1397 ic->ic_aid_bitmap); 1398 newassoc = 1; 1399 } 1400 } else 1401 newassoc = 0; 1402 /* XXX for 11g must turn off short slot time if long 1403 slot time sta associates */ 1404 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS); 1405 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, 1406 ("station %s %s associated at aid %d\n", 1407 ether_sprintf(ni->ni_macaddr), 1408 (newassoc ? "newly" : "already"), 1409 ni->ni_associd & ~0xc000)); 1410 /* give driver a chance to setup state like ni_txrate */ 1411 if (ic->ic_newassoc) 1412 (*ic->ic_newassoc)(ic, ni, newassoc); 1413 break; 1414 } 1415 1416 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1417 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1418 u_int16_t status; 1419 1420 if (ic->ic_opmode != IEEE80211_M_STA || 1421 ic->ic_state != IEEE80211_S_ASSOC) { 1422 ic->ic_stats.is_rx_mgtdiscard++; 1423 return; 1424 } 1425 1426 /* 1427 * asresp frame format 1428 * [2] capability information 1429 * [2] status 1430 * [2] association ID 1431 * [tlv] supported rates 1432 * [tlv] extended supported rates 1433 */ 1434 IEEE80211_VERIFY_LENGTH(efrm - frm, 6); 1435 ni = ic->ic_bss; 1436 ni->ni_capinfo = le16toh(*(u_int16_t *)frm); 1437 frm += 2; 1438 1439 status = le16toh(*(u_int16_t *)frm); 1440 frm += 2; 1441 if (status != 0) { 1442 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1443 ("%sassociation failed (reason %d) for %s\n", 1444 ISREASSOC(subtype) ? "re" : "", 1445 status, ether_sprintf(wh->i_addr3))); 1446 if (ni != ic->ic_bss) 1447 ni->ni_fails++; 1448 ic->ic_stats.is_rx_auth_fail++; 1449 return; 1450 } 1451 ni->ni_associd = le16toh(*(u_int16_t *)frm); 1452 frm += 2; 1453 1454 rates = xrates = NULL; 1455 while (frm < efrm) { 1456 switch (*frm) { 1457 case IEEE80211_ELEMID_RATES: 1458 rates = frm; 1459 break; 1460 case IEEE80211_ELEMID_XRATES: 1461 xrates = frm; 1462 break; 1463 } 1464 frm += frm[1] + 2; 1465 } 1466 1467 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); 1468 ieee80211_setup_rates(ic, ni, rates, xrates, 1469 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1470 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1471 if (ni->ni_rates.rs_nrates != 0) 1472 ieee80211_new_state(ic, IEEE80211_S_RUN, 1473 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 1474 break; 1475 } 1476 1477 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1478 u_int16_t reason; 1479 /* 1480 * deauth frame format 1481 * [2] reason 1482 */ 1483 IEEE80211_VERIFY_LENGTH(efrm - frm, 2); 1484 reason = le16toh(*(u_int16_t *)frm); 1485 ic->ic_stats.is_rx_deauth++; 1486 switch (ic->ic_opmode) { 1487 case IEEE80211_M_STA: 1488 ieee80211_new_state(ic, IEEE80211_S_AUTH, 1489 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 1490 break; 1491 case IEEE80211_M_HOSTAP: 1492 if (ni != ic->ic_bss) { 1493 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1494 ("station %s deauthenticated by " 1495 "peer (reason %d)\n", 1496 ether_sprintf(ni->ni_macaddr), reason)); 1497 /* node will be free'd on return */ 1498 ieee80211_unref_node(&ni); 1499 } 1500 break; 1501 default: 1502 break; 1503 } 1504 break; 1505 } 1506 1507 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1508 u_int16_t reason; 1509 /* 1510 * disassoc frame format 1511 * [2] reason 1512 */ 1513 IEEE80211_VERIFY_LENGTH(efrm - frm, 2); 1514 reason = le16toh(*(u_int16_t *)frm); 1515 ic->ic_stats.is_rx_disassoc++; 1516 switch (ic->ic_opmode) { 1517 case IEEE80211_M_STA: 1518 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 1519 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 1520 break; 1521 case IEEE80211_M_HOSTAP: 1522 if (ni != ic->ic_bss) { 1523 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1524 ("station %s disassociated by " 1525 "peer (reason %d)\n", 1526 ether_sprintf(ni->ni_macaddr), reason)); 1527 IEEE80211_AID_CLR(ni->ni_associd, 1528 ic->ic_aid_bitmap); 1529 ni->ni_associd = 0; 1530 /* XXX node reclaimed how? */ 1531 } 1532 break; 1533 default: 1534 break; 1535 } 1536 break; 1537 } 1538 default: 1539 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1540 ("%s: mgmt frame with subtype 0x%x not handled\n", 1541 __func__, subtype)); 1542 ic->ic_stats.is_rx_badsubtype++; 1543 break; 1544 } 1545 } 1546 1547 static void 1548 ieee80211_recv_pspoll(struct ieee80211com *ic, struct mbuf *m0, int rssi, 1549 u_int32_t rstamp) 1550 { 1551 struct ifnet *ifp = &ic->ic_if; 1552 struct ieee80211_frame *wh; 1553 struct ieee80211_node *ni; 1554 struct mbuf *m; 1555 u_int16_t aid; 1556 1557 if (ic->ic_set_tim == NULL) /* No powersaving functionality */ 1558 return; 1559 1560 wh = mtod(m0, struct ieee80211_frame *); 1561 1562 if ((ni = ieee80211_find_node(ic, wh->i_addr2)) == NULL) { 1563 if (ifp->if_flags & IFF_DEBUG) 1564 printf("%s: station %s sent bogus power save poll\n", 1565 ifp->if_xname, ether_sprintf(wh->i_addr2)); 1566 return; 1567 } 1568 1569 memcpy(&aid, wh->i_dur, sizeof(wh->i_dur)); 1570 if ((aid & 0xc000) != 0xc000) { 1571 if (ifp->if_flags & IFF_DEBUG) 1572 printf("%s: station %s sent bogus aid %x\n", 1573 ifp->if_xname, ether_sprintf(wh->i_addr2), aid); 1574 return; 1575 } 1576 1577 if (aid != ni->ni_associd) { 1578 if (ifp->if_flags & IFF_DEBUG) 1579 printf("%s: station %s aid %x doesn't match pspoll " 1580 "aid %x\n", 1581 ifp->if_xname, ether_sprintf(wh->i_addr2), 1582 ni->ni_associd, aid); 1583 return; 1584 } 1585 1586 /* Okay, take the first queued packet and put it out... */ 1587 1588 IF_DEQUEUE(&ni->ni_savedq, m); 1589 if (m == NULL) { 1590 if (ifp->if_flags & IFF_DEBUG) 1591 printf("%s: station %s sent pspoll, " 1592 "but no packets are saved\n", 1593 ifp->if_xname, ether_sprintf(wh->i_addr2)); 1594 return; 1595 } 1596 wh = mtod(m, struct ieee80211_frame *); 1597 1598 /* 1599 * If this is the last packet, turn off the TIM fields. 1600 * If there are more packets, set the more packets bit. 1601 */ 1602 1603 if (IF_IS_EMPTY(&ni->ni_savedq)) { 1604 if (ic->ic_set_tim) 1605 ic->ic_set_tim(ic, ni->ni_associd, 0); 1606 } else { 1607 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1608 } 1609 1610 if (ifp->if_flags & IFF_DEBUG) 1611 printf("%s: enqueued power saving packet for station %s\n", 1612 ifp->if_xname, ether_sprintf(ni->ni_macaddr)); 1613 1614 IF_ENQUEUE(&ic->ic_pwrsaveq, m); 1615 (*ifp->if_start)(ifp); 1616 } 1617 #undef IEEE80211_VERIFY_LENGTH 1618 #undef IEEE80211_VERIFY_ELEMENT 1619
Indexes created Mon Sep 22 13:09:51 GMT 2025