ieee80211_input.c revision 193288
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_input.c 193288 2009-06-02 00:06:39Z sam $"); 29 30#include "opt_wlan.h" 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/mbuf.h> 35#include <sys/malloc.h> 36#include <sys/endian.h> 37#include <sys/kernel.h> 38 39#include <sys/socket.h> 40 41#include <net/ethernet.h> 42#include <net/if.h> 43#include <net/if_llc.h> 44#include <net/if_media.h> 45#include <net/if_vlan_var.h> 46 47#include <net80211/ieee80211_var.h> 48#include <net80211/ieee80211_input.h> 49 50#include <net/bpf.h> 51 52#ifdef INET 53#include <netinet/in.h> 54#include <net/ethernet.h> 55#endif 56 57int 58ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf) 59{ 60 struct ieee80211vap *vap; 61 int type = -1; 62 63 /* XXX locking */ 64 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 65 struct ieee80211_node *ni; 66 struct mbuf *mcopy; 67 68 /* NB: could check for IFF_UP but this is cheaper */ 69 if (vap->iv_state == IEEE80211_S_INIT) 70 continue; 71 /* 72 * WDS vap's only receive directed traffic from the 73 * station at the ``far end''. That traffic should 74 * be passed through the AP vap the station is associated 75 * to--so don't spam them with mcast frames. 76 */ 77 if (vap->iv_opmode == IEEE80211_M_WDS) 78 continue; 79 if (TAILQ_NEXT(vap, iv_next) != NULL) { 80 /* 81 * Packet contents are changed by ieee80211_decap 82 * so do a deep copy of the packet. 83 */ 84 mcopy = m_dup(m, M_DONTWAIT); 85 if (mcopy == NULL) { 86 /* XXX stat+msg */ 87 continue; 88 } 89 } else { 90 mcopy = m; 91 m = NULL; 92 } 93 ni = ieee80211_ref_node(vap->iv_bss); 94 type = ieee80211_input(ni, mcopy, rssi, nf); 95 ieee80211_free_node(ni); 96 } 97 if (m != NULL) /* no vaps, reclaim mbuf */ 98 m_freem(m); 99 return type; 100} 101 102/* 103 * This function reassembles fragments. 104 * 105 * XXX should handle 3 concurrent reassemblies per-spec. 106 */ 107struct mbuf * 108ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace) 109{ 110 struct ieee80211vap *vap = ni->ni_vap; 111 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 112 struct ieee80211_frame *lwh; 113 uint16_t rxseq; 114 uint8_t fragno; 115 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 116 struct mbuf *mfrag; 117 118 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 119 120 rxseq = le16toh(*(uint16_t *)wh->i_seq); 121 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 122 123 /* Quick way out, if there's nothing to defragment */ 124 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 125 return m; 126 127 /* 128 * Remove frag to insure it doesn't get reaped by timer. 129 */ 130 if (ni->ni_table == NULL) { 131 /* 132 * Should never happen. If the node is orphaned (not in 133 * the table) then input packets should not reach here. 134 * Otherwise, a concurrent request that yanks the table 135 * should be blocked by other interlocking and/or by first 136 * shutting the driver down. Regardless, be defensive 137 * here and just bail 138 */ 139 /* XXX need msg+stat */ 140 m_freem(m); 141 return NULL; 142 } 143 IEEE80211_NODE_LOCK(ni->ni_table); 144 mfrag = ni->ni_rxfrag[0]; 145 ni->ni_rxfrag[0] = NULL; 146 IEEE80211_NODE_UNLOCK(ni->ni_table); 147 148 /* 149 * Validate new fragment is in order and 150 * related to the previous ones. 151 */ 152 if (mfrag != NULL) { 153 uint16_t last_rxseq; 154 155 lwh = mtod(mfrag, struct ieee80211_frame *); 156 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 157 /* NB: check seq # and frag together */ 158 if (rxseq != last_rxseq+1 || 159 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || 160 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 161 /* 162 * Unrelated fragment or no space for it, 163 * clear current fragments. 164 */ 165 m_freem(mfrag); 166 mfrag = NULL; 167 } 168 } 169 170 if (mfrag == NULL) { 171 if (fragno != 0) { /* !first fragment, discard */ 172 vap->iv_stats.is_rx_defrag++; 173 IEEE80211_NODE_STAT(ni, rx_defrag); 174 m_freem(m); 175 return NULL; 176 } 177 mfrag = m; 178 } else { /* concatenate */ 179 m_adj(m, hdrspace); /* strip header */ 180 m_cat(mfrag, m); 181 /* NB: m_cat doesn't update the packet header */ 182 mfrag->m_pkthdr.len += m->m_pkthdr.len; 183 /* track last seqnum and fragno */ 184 lwh = mtod(mfrag, struct ieee80211_frame *); 185 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 186 } 187 if (more_frag) { /* more to come, save */ 188 ni->ni_rxfragstamp = ticks; 189 ni->ni_rxfrag[0] = mfrag; 190 mfrag = NULL; 191 } 192 return mfrag; 193} 194 195void 196ieee80211_deliver_data(struct ieee80211vap *vap, 197 struct ieee80211_node *ni, struct mbuf *m) 198{ 199 struct ether_header *eh = mtod(m, struct ether_header *); 200 struct ifnet *ifp = vap->iv_ifp; 201 202 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 203 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 204 /* 205 * Do accounting. 206 */ 207 ifp->if_ipackets++; 208 IEEE80211_NODE_STAT(ni, rx_data); 209 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 210 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 211 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 212 IEEE80211_NODE_STAT(ni, rx_mcast); 213 } else 214 IEEE80211_NODE_STAT(ni, rx_ucast); 215 m->m_pkthdr.rcvif = ifp; 216 217 /* clear driver/net80211 flags before passing up */ 218 m->m_flags &= ~M_80211_RX; 219 220 if (ni->ni_vlan != 0) { 221 /* attach vlan tag */ 222 m->m_pkthdr.ether_vtag = ni->ni_vlan; 223 m->m_flags |= M_VLANTAG; 224 } 225 ifp->if_input(ifp, m); 226} 227 228struct mbuf * 229ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 230{ 231 struct ieee80211_qosframe_addr4 wh; /* Max size address frames */ 232 struct ether_header *eh; 233 struct llc *llc; 234 235 if (m->m_len < hdrlen + sizeof(*llc) && 236 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 237 /* XXX stat, msg */ 238 return NULL; 239 } 240 memcpy(&wh, mtod(m, caddr_t), hdrlen); 241 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 242 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 243 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 244 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 245 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 246 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 247 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 248 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 249 llc = NULL; 250 } else { 251 m_adj(m, hdrlen - sizeof(*eh)); 252 } 253 eh = mtod(m, struct ether_header *); 254 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 255 case IEEE80211_FC1_DIR_NODS: 256 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 257 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 258 break; 259 case IEEE80211_FC1_DIR_TODS: 260 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 261 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 262 break; 263 case IEEE80211_FC1_DIR_FROMDS: 264 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 265 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 266 break; 267 case IEEE80211_FC1_DIR_DSTODS: 268 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 269 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 270 break; 271 } 272#ifdef ALIGNED_POINTER 273 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 274 struct mbuf *n, *n0, **np; 275 caddr_t newdata; 276 int off, pktlen; 277 278 n0 = NULL; 279 np = &n0; 280 off = 0; 281 pktlen = m->m_pkthdr.len; 282 while (pktlen > off) { 283 if (n0 == NULL) { 284 MGETHDR(n, M_DONTWAIT, MT_DATA); 285 if (n == NULL) { 286 m_freem(m); 287 return NULL; 288 } 289 M_MOVE_PKTHDR(n, m); 290 n->m_len = MHLEN; 291 } else { 292 MGET(n, M_DONTWAIT, MT_DATA); 293 if (n == NULL) { 294 m_freem(m); 295 m_freem(n0); 296 return NULL; 297 } 298 n->m_len = MLEN; 299 } 300 if (pktlen - off >= MINCLSIZE) { 301 MCLGET(n, M_DONTWAIT); 302 if (n->m_flags & M_EXT) 303 n->m_len = n->m_ext.ext_size; 304 } 305 if (n0 == NULL) { 306 newdata = 307 (caddr_t)ALIGN(n->m_data + sizeof(*eh)) - 308 sizeof(*eh); 309 n->m_len -= newdata - n->m_data; 310 n->m_data = newdata; 311 } 312 if (n->m_len > pktlen - off) 313 n->m_len = pktlen - off; 314 m_copydata(m, off, n->m_len, mtod(n, caddr_t)); 315 off += n->m_len; 316 *np = n; 317 np = &n->m_next; 318 } 319 m_freem(m); 320 m = n0; 321 } 322#endif /* ALIGNED_POINTER */ 323 if (llc != NULL) { 324 eh = mtod(m, struct ether_header *); 325 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 326 } 327 return m; 328} 329 330/* 331 * Decap a frame encapsulated in a fast-frame/A-MSDU. 332 */ 333struct mbuf * 334ieee80211_decap1(struct mbuf *m, int *framelen) 335{ 336#define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 337 struct ether_header *eh; 338 struct llc *llc; 339 340 /* 341 * The frame has an 802.3 header followed by an 802.2 342 * LLC header. The encapsulated frame length is in the 343 * first header type field; save that and overwrite it 344 * with the true type field found in the second. Then 345 * copy the 802.3 header up to where it belongs and 346 * adjust the mbuf contents to remove the void. 347 */ 348 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 349 return NULL; 350 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 351 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 352 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 353 + sizeof(struct ether_header) - sizeof(struct llc); 354 eh->ether_type = llc->llc_un.type_snap.ether_type; 355 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 356 sizeof(struct ether_header)); 357 m_adj(m, sizeof(struct llc)); 358 return m; 359#undef FF_LLC_SIZE 360} 361 362/* 363 * Install received rate set information in the node's state block. 364 */ 365int 366ieee80211_setup_rates(struct ieee80211_node *ni, 367 const uint8_t *rates, const uint8_t *xrates, int flags) 368{ 369 struct ieee80211vap *vap = ni->ni_vap; 370 struct ieee80211_rateset *rs = &ni->ni_rates; 371 372 memset(rs, 0, sizeof(*rs)); 373 rs->rs_nrates = rates[1]; 374 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 375 if (xrates != NULL) { 376 uint8_t nxrates; 377 /* 378 * Tack on 11g extended supported rate element. 379 */ 380 nxrates = xrates[1]; 381 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 382 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 383 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 384 "extended rate set too large; only using " 385 "%u of %u rates", nxrates, xrates[1]); 386 vap->iv_stats.is_rx_rstoobig++; 387 } 388 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 389 rs->rs_nrates += nxrates; 390 } 391 return ieee80211_fix_rate(ni, rs, flags); 392} 393 394/* 395 * Send a management frame error response to the specified 396 * station. If ni is associated with the station then use 397 * it; otherwise allocate a temporary node suitable for 398 * transmitting the frame and then free the reference so 399 * it will go away as soon as the frame has been transmitted. 400 */ 401void 402ieee80211_send_error(struct ieee80211_node *ni, 403 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 404{ 405 struct ieee80211vap *vap = ni->ni_vap; 406 int istmp; 407 408 if (ni == vap->iv_bss) { 409 if (vap->iv_state != IEEE80211_S_RUN) { 410 /* 411 * XXX hack until we get rid of this routine. 412 * We can be called prior to the vap reaching 413 * run state under certain conditions in which 414 * case iv_bss->ni_chan will not be setup. 415 * Check for this explicitly and and just ignore 416 * the request. 417 */ 418 return; 419 } 420 ni = ieee80211_tmp_node(vap, mac); 421 if (ni == NULL) { 422 /* XXX msg */ 423 return; 424 } 425 istmp = 1; 426 } else 427 istmp = 0; 428 IEEE80211_SEND_MGMT(ni, subtype, arg); 429 if (istmp) 430 ieee80211_free_node(ni); 431} 432 433int 434ieee80211_alloc_challenge(struct ieee80211_node *ni) 435{ 436 if (ni->ni_challenge == NULL) 437 ni->ni_challenge = (uint32_t *) malloc(IEEE80211_CHALLENGE_LEN, 438 M_80211_NODE, M_NOWAIT); 439 if (ni->ni_challenge == NULL) { 440 IEEE80211_NOTE(ni->ni_vap, 441 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 442 "%s", "shared key challenge alloc failed"); 443 /* XXX statistic */ 444 } 445 return (ni->ni_challenge != NULL); 446} 447 448/* 449 * Parse a Beacon or ProbeResponse frame and return the 450 * useful information in an ieee80211_scanparams structure. 451 * Status is set to 0 if no problems were found; otherwise 452 * a bitmask of IEEE80211_BPARSE_* items is returned that 453 * describes the problems detected. 454 */ 455int 456ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 457 struct ieee80211_scanparams *scan) 458{ 459 struct ieee80211vap *vap = ni->ni_vap; 460 struct ieee80211com *ic = ni->ni_ic; 461 struct ieee80211_frame *wh; 462 uint8_t *frm, *efrm; 463 464 wh = mtod(m, struct ieee80211_frame *); 465 frm = (uint8_t *)&wh[1]; 466 efrm = mtod(m, uint8_t *) + m->m_len; 467 scan->status = 0; 468 /* 469 * beacon/probe response frame format 470 * [8] time stamp 471 * [2] beacon interval 472 * [2] capability information 473 * [tlv] ssid 474 * [tlv] supported rates 475 * [tlv] country information 476 * [tlv] parameter set (FH/DS) 477 * [tlv] erp information 478 * [tlv] extended supported rates 479 * [tlv] WME 480 * [tlv] WPA or RSN 481 * [tlv] HT capabilities 482 * [tlv] HT information 483 * [tlv] Atheros capabilities 484 */ 485 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 486 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 487 memset(scan, 0, sizeof(*scan)); 488 scan->tstamp = frm; frm += 8; 489 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 490 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 491 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 492 scan->chan = scan->bchan; 493 scan->ies = frm; 494 scan->ies_len = efrm - frm; 495 496 while (efrm - frm > 1) { 497 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 498 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 499 switch (*frm) { 500 case IEEE80211_ELEMID_SSID: 501 scan->ssid = frm; 502 break; 503 case IEEE80211_ELEMID_RATES: 504 scan->rates = frm; 505 break; 506 case IEEE80211_ELEMID_COUNTRY: 507 scan->country = frm; 508 break; 509 case IEEE80211_ELEMID_FHPARMS: 510 if (ic->ic_phytype == IEEE80211_T_FH) { 511 scan->fhdwell = LE_READ_2(&frm[2]); 512 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 513 scan->fhindex = frm[6]; 514 } 515 break; 516 case IEEE80211_ELEMID_DSPARMS: 517 /* 518 * XXX hack this since depending on phytype 519 * is problematic for multi-mode devices. 520 */ 521 if (ic->ic_phytype != IEEE80211_T_FH) 522 scan->chan = frm[2]; 523 break; 524 case IEEE80211_ELEMID_TIM: 525 /* XXX ATIM? */ 526 scan->tim = frm; 527 scan->timoff = frm - mtod(m, uint8_t *); 528 break; 529 case IEEE80211_ELEMID_IBSSPARMS: 530 case IEEE80211_ELEMID_CFPARMS: 531 case IEEE80211_ELEMID_PWRCNSTR: 532 /* NB: avoid debugging complaints */ 533 break; 534 case IEEE80211_ELEMID_XRATES: 535 scan->xrates = frm; 536 break; 537 case IEEE80211_ELEMID_ERP: 538 if (frm[1] != 1) { 539 IEEE80211_DISCARD_IE(vap, 540 IEEE80211_MSG_ELEMID, wh, "ERP", 541 "bad len %u", frm[1]); 542 vap->iv_stats.is_rx_elem_toobig++; 543 break; 544 } 545 scan->erp = frm[2] | 0x100; 546 break; 547 case IEEE80211_ELEMID_HTCAP: 548 scan->htcap = frm; 549 break; 550 case IEEE80211_ELEMID_RSN: 551 scan->rsn = frm; 552 break; 553 case IEEE80211_ELEMID_HTINFO: 554 scan->htinfo = frm; 555 break; 556 case IEEE80211_ELEMID_VENDOR: 557 if (iswpaoui(frm)) 558 scan->wpa = frm; 559 else if (iswmeparam(frm) || iswmeinfo(frm)) 560 scan->wme = frm; 561#ifdef IEEE80211_SUPPORT_SUPERG 562 else if (isatherosoui(frm)) 563 scan->ath = frm; 564#endif 565#ifdef IEEE80211_SUPPORT_TDMA 566 else if (istdmaoui(frm)) 567 scan->tdma = frm; 568#endif 569 else if (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 570 /* 571 * Accept pre-draft HT ie's if the 572 * standard ones have not been seen. 573 */ 574 if (ishtcapoui(frm)) { 575 if (scan->htcap == NULL) 576 scan->htcap = frm; 577 } else if (ishtinfooui(frm)) { 578 if (scan->htinfo == NULL) 579 scan->htcap = frm; 580 } 581 } 582 break; 583 default: 584 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 585 wh, "unhandled", 586 "id %u, len %u", *frm, frm[1]); 587 vap->iv_stats.is_rx_elem_unknown++; 588 break; 589 } 590 frm += frm[1] + 2; 591 } 592 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 593 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 594 if (scan->rates != NULL && scan->xrates != NULL) { 595 /* 596 * NB: don't process XRATES if RATES is missing. This 597 * avoids a potential null ptr deref and should be ok 598 * as the return code will already note RATES is missing 599 * (so callers shouldn't otherwise process the frame). 600 */ 601 IEEE80211_VERIFY_ELEMENT(scan->xrates, 602 IEEE80211_RATE_MAXSIZE - scan->rates[1], 603 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 604 } 605 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 606 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 607 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 608 /* 609 * Frame was received on a channel different from the 610 * one indicated in the DS params element id; 611 * silently discard it. 612 * 613 * NB: this can happen due to signal leakage. 614 * But we should take it for FH phy because 615 * the rssi value should be correct even for 616 * different hop pattern in FH. 617 */ 618 IEEE80211_DISCARD(vap, 619 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 620 wh, NULL, "for off-channel %u", scan->chan); 621 vap->iv_stats.is_rx_chanmismatch++; 622 scan->status |= IEEE80211_BPARSE_OFFCHAN; 623 } 624 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 625 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 626 IEEE80211_DISCARD(vap, 627 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 628 wh, NULL, "bogus beacon interval", scan->bintval); 629 vap->iv_stats.is_rx_badbintval++; 630 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 631 } 632 if (scan->country != NULL) { 633 /* 634 * Validate we have at least enough data to extract 635 * the country code. Not sure if we should return an 636 * error instead of discarding the IE; consider this 637 * being lenient as we don't depend on the data for 638 * correct operation. 639 */ 640 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 641 scan->country = NULL); 642 } 643 /* 644 * Process HT ie's. This is complicated by our 645 * accepting both the standard ie's and the pre-draft 646 * vendor OUI ie's that some vendors still use/require. 647 */ 648 if (scan->htcap != NULL) { 649 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 650 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 651 4 + sizeof(struct ieee80211_ie_htcap)-2 : 652 sizeof(struct ieee80211_ie_htcap)-2, 653 scan->htcap = NULL); 654 } 655 if (scan->htinfo != NULL) { 656 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 657 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 658 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 659 sizeof(struct ieee80211_ie_htinfo)-2, 660 scan->htinfo = NULL); 661 } 662 return scan->status; 663} 664 665/* 666 * Parse an Action frame. Return 0 on success, non-zero on failure. 667 */ 668int 669ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 670{ 671 struct ieee80211vap *vap = ni->ni_vap; 672 const struct ieee80211_action *ia; 673 struct ieee80211_frame *wh; 674 uint8_t *frm, *efrm; 675 676 /* 677 * action frame format: 678 * [1] category 679 * [1] action 680 * [tlv] parameters 681 */ 682 wh = mtod(m, struct ieee80211_frame *); 683 frm = (u_int8_t *)&wh[1]; 684 efrm = mtod(m, u_int8_t *) + m->m_len; 685 IEEE80211_VERIFY_LENGTH(efrm - frm, 686 sizeof(struct ieee80211_action), return EINVAL); 687 ia = (const struct ieee80211_action *) frm; 688 689 vap->iv_stats.is_rx_action++; 690 IEEE80211_NODE_STAT(ni, rx_action); 691 692 /* verify frame payloads but defer processing */ 693 /* XXX maybe push this to method */ 694 switch (ia->ia_category) { 695 case IEEE80211_ACTION_CAT_BA: 696 switch (ia->ia_action) { 697 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 698 IEEE80211_VERIFY_LENGTH(efrm - frm, 699 sizeof(struct ieee80211_action_ba_addbarequest), 700 return EINVAL); 701 break; 702 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 703 IEEE80211_VERIFY_LENGTH(efrm - frm, 704 sizeof(struct ieee80211_action_ba_addbaresponse), 705 return EINVAL); 706 break; 707 case IEEE80211_ACTION_BA_DELBA: 708 IEEE80211_VERIFY_LENGTH(efrm - frm, 709 sizeof(struct ieee80211_action_ba_delba), 710 return EINVAL); 711 break; 712 } 713 break; 714 case IEEE80211_ACTION_CAT_HT: 715 switch (ia->ia_action) { 716 case IEEE80211_ACTION_HT_TXCHWIDTH: 717 IEEE80211_VERIFY_LENGTH(efrm - frm, 718 sizeof(struct ieee80211_action_ht_txchwidth), 719 return EINVAL); 720 break; 721 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 722 IEEE80211_VERIFY_LENGTH(efrm - frm, 723 sizeof(struct ieee80211_action_ht_mimopowersave), 724 return EINVAL); 725 break; 726 } 727 break; 728 } 729 return 0; 730} 731 732#ifdef IEEE80211_DEBUG 733/* 734 * Debugging support. 735 */ 736void 737ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 738 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 739{ 740 printf("[%s] discard %s frame, ssid mismatch: ", 741 ether_sprintf(mac), tag); 742 ieee80211_print_essid(ssid + 2, ssid[1]); 743 printf("\n"); 744} 745 746/* 747 * Return the bssid of a frame. 748 */ 749static const uint8_t * 750ieee80211_getbssid(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 751{ 752 if (vap->iv_opmode == IEEE80211_M_STA) 753 return wh->i_addr2; 754 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 755 return wh->i_addr1; 756 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 757 return wh->i_addr1; 758 return wh->i_addr3; 759} 760 761#include <machine/stdarg.h> 762 763void 764ieee80211_note(struct ieee80211vap *vap, const char *fmt, ...) 765{ 766 char buf[128]; /* XXX */ 767 va_list ap; 768 769 va_start(ap, fmt); 770 vsnprintf(buf, sizeof(buf), fmt, ap); 771 va_end(ap); 772 773 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 774} 775 776void 777ieee80211_note_frame(struct ieee80211vap *vap, 778 const struct ieee80211_frame *wh, 779 const char *fmt, ...) 780{ 781 char buf[128]; /* XXX */ 782 va_list ap; 783 784 va_start(ap, fmt); 785 vsnprintf(buf, sizeof(buf), fmt, ap); 786 va_end(ap); 787 if_printf(vap->iv_ifp, "[%s] %s\n", 788 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 789} 790 791void 792ieee80211_note_mac(struct ieee80211vap *vap, 793 const uint8_t mac[IEEE80211_ADDR_LEN], 794 const char *fmt, ...) 795{ 796 char buf[128]; /* XXX */ 797 va_list ap; 798 799 va_start(ap, fmt); 800 vsnprintf(buf, sizeof(buf), fmt, ap); 801 va_end(ap); 802 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 803} 804 805void 806ieee80211_discard_frame(struct ieee80211vap *vap, 807 const struct ieee80211_frame *wh, 808 const char *type, const char *fmt, ...) 809{ 810 va_list ap; 811 812 if_printf(vap->iv_ifp, "[%s] discard ", 813 ether_sprintf(ieee80211_getbssid(vap, wh))); 814 if (type == NULL) { 815 printf("%s frame, ", ieee80211_mgt_subtype_name[ 816 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 817 IEEE80211_FC0_SUBTYPE_SHIFT]); 818 } else 819 printf("%s frame, ", type); 820 va_start(ap, fmt); 821 vprintf(fmt, ap); 822 va_end(ap); 823 printf("\n"); 824} 825 826void 827ieee80211_discard_ie(struct ieee80211vap *vap, 828 const struct ieee80211_frame *wh, 829 const char *type, const char *fmt, ...) 830{ 831 va_list ap; 832 833 if_printf(vap->iv_ifp, "[%s] discard ", 834 ether_sprintf(ieee80211_getbssid(vap, wh))); 835 if (type != NULL) 836 printf("%s information element, ", type); 837 else 838 printf("information element, "); 839 va_start(ap, fmt); 840 vprintf(fmt, ap); 841 va_end(ap); 842 printf("\n"); 843} 844 845void 846ieee80211_discard_mac(struct ieee80211vap *vap, 847 const uint8_t mac[IEEE80211_ADDR_LEN], 848 const char *type, const char *fmt, ...) 849{ 850 va_list ap; 851 852 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 853 if (type != NULL) 854 printf("%s frame, ", type); 855 else 856 printf("frame, "); 857 va_start(ap, fmt); 858 vprintf(fmt, ap); 859 va_end(ap); 860 printf("\n"); 861} 862#endif /* IEEE80211_DEBUG */ 863