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 * $FreeBSD: head/sys/net80211/ieee80211_input.c 205986 2010-03-31 16:07:36Z rpaulo $ 27 */ 28 29 #include "opt_wlan.h" 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/mbuf.h> 34 #include <sys/malloc.h> 35 #include <sys/endian.h> 36 #include <sys/kernel.h> 37 38 #include <sys/socket.h> 39 40 #include <net/ethernet.h> 41 #include <net/if.h> 42 #include <net/if_llc.h> 43 #include <net/if_media.h> 44 #include <net/route.h> 45 46 #include <netproto/802_11/ieee80211_var.h> 47 #include <netproto/802_11/ieee80211_input.h> 48 #ifdef IEEE80211_SUPPORT_MESH 49 #include <netproto/802_11/ieee80211_mesh.h> 50 #endif 51 52 #include <net/bpf.h> 53 54 #ifdef INET 55 #include <netinet/in.h> 56 #endif 57 58 int 59 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf) 60 { 61 struct ieee80211vap *vap; 62 int type = -1; 63 64 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */ 65 66 /* XXX locking */ 67 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 68 struct ieee80211_node *ni; 69 struct mbuf *mcopy; 70 71 /* NB: could check for IFF_UP but this is cheaper */ 72 if (vap->iv_state == IEEE80211_S_INIT) 73 continue; 74 /* 75 * WDS vap's only receive directed traffic from the 76 * station at the ``far end''. That traffic should 77 * be passed through the AP vap the station is associated 78 * to--so don't spam them with mcast frames. 79 */ 80 if (vap->iv_opmode == IEEE80211_M_WDS) 81 continue; 82 if (TAILQ_NEXT(vap, iv_next) != NULL) { 83 /* 84 * Packet contents are changed by ieee80211_decap 85 * so do a deep copy of the packet. 86 */ 87 mcopy = m_dup(m, MB_DONTWAIT); 88 if (mcopy == NULL) { 89 /* XXX stat+msg */ 90 continue; 91 } 92 } else { 93 mcopy = m; 94 m = NULL; 95 } 96 ni = ieee80211_ref_node(vap->iv_bss); 97 type = ieee80211_input(ni, mcopy, rssi, nf); 98 ieee80211_free_node(ni); 99 } 100 if (m != NULL) /* no vaps, reclaim mbuf */ 101 m_freem(m); 102 return type; 103 } 104 105 /* 106 * This function reassembles fragments. 107 * 108 * XXX should handle 3 concurrent reassemblies per-spec. 109 */ 110 struct mbuf * 111 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace) 112 { 113 struct ieee80211vap *vap = ni->ni_vap; 114 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 115 struct ieee80211_frame *lwh; 116 uint16_t rxseq; 117 uint8_t fragno; 118 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 119 struct mbuf *mfrag; 120 121 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 122 123 rxseq = le16toh(*(uint16_t *)wh->i_seq); 124 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 125 126 /* Quick way out, if there's nothing to defragment */ 127 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 128 return m; 129 130 /* 131 * Remove frag to insure it doesn't get reaped by timer. 132 */ 133 if (ni->ni_table == NULL) { 134 /* 135 * Should never happen. If the node is orphaned (not in 136 * the table) then input packets should not reach here. 137 * Otherwise, a concurrent request that yanks the table 138 * should be blocked by other interlocking and/or by first 139 * shutting the driver down. Regardless, be defensive 140 * here and just bail 141 */ 142 /* XXX need msg+stat */ 143 m_freem(m); 144 return NULL; 145 } 146 mfrag = ni->ni_rxfrag[0]; 147 ni->ni_rxfrag[0] = NULL; 148 149 /* 150 * Validate new fragment is in order and 151 * related to the previous ones. 152 */ 153 if (mfrag != NULL) { 154 uint16_t last_rxseq; 155 156 lwh = mtod(mfrag, struct ieee80211_frame *); 157 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 158 /* NB: check seq # and frag together */ 159 if (rxseq != last_rxseq+1 || 160 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || 161 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 162 /* 163 * Unrelated fragment or no space for it, 164 * clear current fragments. 165 */ 166 m_freem(mfrag); 167 mfrag = NULL; 168 } 169 } 170 171 if (mfrag == NULL) { 172 if (fragno != 0) { /* !first fragment, discard */ 173 vap->iv_stats.is_rx_defrag++; 174 IEEE80211_NODE_STAT(ni, rx_defrag); 175 m_freem(m); 176 return NULL; 177 } 178 mfrag = m; 179 } else { /* concatenate */ 180 m_adj(m, hdrspace); /* strip header */ 181 m_cat(mfrag, m); 182 /* NB: m_cat doesn't update the packet header */ 183 mfrag->m_pkthdr.len += m->m_pkthdr.len; 184 /* track last seqnum and fragno */ 185 lwh = mtod(mfrag, struct ieee80211_frame *); 186 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 187 } 188 if (more_frag) { /* more to come, save */ 189 ni->ni_rxfragstamp = ticks; 190 ni->ni_rxfrag[0] = mfrag; 191 mfrag = NULL; 192 } 193 return mfrag; 194 } 195 196 void 197 ieee80211_deliver_data(struct ieee80211vap *vap, 198 struct ieee80211_node *ni, struct mbuf *m) 199 { 200 struct ether_header *eh = mtod(m, struct ether_header *); 201 struct ifnet *ifp = vap->iv_ifp; 202 203 /* clear driver/net80211 flags before passing up */ 204 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST); 205 206 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 207 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 208 /* 209 * Do accounting. 210 */ 211 IFNET_STAT_INC(ifp, ipackets, 1); 212 IEEE80211_NODE_STAT(ni, rx_data); 213 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 214 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 215 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 216 IEEE80211_NODE_STAT(ni, rx_mcast); 217 } else 218 IEEE80211_NODE_STAT(ni, rx_ucast); 219 m->m_pkthdr.rcvif = ifp; 220 221 if (ni->ni_vlan != 0) { 222 /* attach vlan tag */ 223 m->m_pkthdr.ether_vlantag = ni->ni_vlan; 224 m->m_flags |= M_VLANTAG; 225 } 226 ifp->if_input(ifp, m); 227 } 228 229 struct mbuf * 230 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 231 { 232 struct ieee80211_qosframe_addr4 wh; 233 struct ether_header *eh; 234 struct llc *llc; 235 236 KASSERT(hdrlen <= sizeof(wh), 237 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 238 239 if (m->m_len < hdrlen + sizeof(*llc) && 240 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 241 vap->iv_stats.is_rx_tooshort++; 242 /* XXX msg */ 243 return NULL; 244 } 245 memcpy(&wh, mtod(m, caddr_t), hdrlen); 246 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 247 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 248 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 249 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 250 !(llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 251 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 252 llc = NULL; 253 } else { 254 m_adj(m, hdrlen - sizeof(*eh)); 255 } 256 eh = mtod(m, struct ether_header *); 257 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 258 case IEEE80211_FC1_DIR_NODS: 259 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 260 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 261 break; 262 case IEEE80211_FC1_DIR_TODS: 263 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 264 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 265 break; 266 case IEEE80211_FC1_DIR_FROMDS: 267 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 268 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 269 break; 270 case IEEE80211_FC1_DIR_DSTODS: 271 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 272 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 273 break; 274 } 275 #ifdef ALIGNED_POINTER 276 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 277 m = ieee80211_realign(vap, m, sizeof(*eh)); 278 if (m == NULL) 279 return NULL; 280 } 281 #endif /* ALIGNED_POINTER */ 282 if (llc != NULL) { 283 eh = mtod(m, struct ether_header *); 284 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 285 } 286 return m; 287 } 288 289 /* 290 * Decap a frame encapsulated in a fast-frame/A-MSDU. 291 */ 292 struct mbuf * 293 ieee80211_decap1(struct mbuf *m, int *framelen) 294 { 295 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 296 struct ether_header *eh; 297 struct llc *llc; 298 299 /* 300 * The frame has an 802.3 header followed by an 802.2 301 * LLC header. The encapsulated frame length is in the 302 * first header type field; save that and overwrite it 303 * with the true type field found in the second. Then 304 * copy the 802.3 header up to where it belongs and 305 * adjust the mbuf contents to remove the void. 306 */ 307 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 308 return NULL; 309 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 310 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 311 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 312 + sizeof(struct ether_header) - sizeof(struct llc); 313 eh->ether_type = llc->llc_un.type_snap.ether_type; 314 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 315 sizeof(struct ether_header)); 316 m_adj(m, sizeof(struct llc)); 317 return m; 318 #undef FF_LLC_SIZE 319 } 320 321 /* 322 * Install received rate set information in the node's state block. 323 */ 324 int 325 ieee80211_setup_rates(struct ieee80211_node *ni, 326 const uint8_t *rates, const uint8_t *xrates, int flags) 327 { 328 struct ieee80211vap *vap = ni->ni_vap; 329 struct ieee80211_rateset *rs = &ni->ni_rates; 330 331 memset(rs, 0, sizeof(*rs)); 332 rs->rs_nrates = rates[1]; 333 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 334 if (xrates != NULL) { 335 uint8_t nxrates; 336 /* 337 * Tack on 11g extended supported rate element. 338 */ 339 nxrates = xrates[1]; 340 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 341 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 342 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 343 "extended rate set too large; only using " 344 "%u of %u rates", nxrates, xrates[1]); 345 vap->iv_stats.is_rx_rstoobig++; 346 } 347 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 348 rs->rs_nrates += nxrates; 349 } 350 return ieee80211_fix_rate(ni, rs, flags); 351 } 352 353 /* 354 * Send a management frame error response to the specified 355 * station. If ni is associated with the station then use 356 * it; otherwise allocate a temporary node suitable for 357 * transmitting the frame and then free the reference so 358 * it will go away as soon as the frame has been transmitted. 359 */ 360 void 361 ieee80211_send_error(struct ieee80211_node *ni, 362 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 363 { 364 struct ieee80211vap *vap = ni->ni_vap; 365 int istmp; 366 367 if (ni == vap->iv_bss) { 368 if (vap->iv_state != IEEE80211_S_RUN) { 369 /* 370 * XXX hack until we get rid of this routine. 371 * We can be called prior to the vap reaching 372 * run state under certain conditions in which 373 * case iv_bss->ni_chan will not be setup. 374 * Check for this explicitly and and just ignore 375 * the request. 376 */ 377 return; 378 } 379 ni = ieee80211_tmp_node(vap, mac); 380 if (ni == NULL) { 381 /* XXX msg */ 382 return; 383 } 384 istmp = 1; 385 } else 386 istmp = 0; 387 IEEE80211_SEND_MGMT(ni, subtype, arg); 388 if (istmp) 389 ieee80211_free_node(ni); 390 } 391 392 int 393 ieee80211_alloc_challenge(struct ieee80211_node *ni) 394 { 395 if (ni->ni_challenge == NULL) 396 ni->ni_challenge = (uint32_t *) kmalloc(IEEE80211_CHALLENGE_LEN, 397 M_80211_NODE, M_INTWAIT); 398 if (ni->ni_challenge == NULL) { 399 IEEE80211_NOTE(ni->ni_vap, 400 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 401 "%s", "shared key challenge alloc failed"); 402 /* XXX statistic */ 403 } 404 return (ni->ni_challenge != NULL); 405 } 406 407 /* 408 * Parse a Beacon or ProbeResponse frame and return the 409 * useful information in an ieee80211_scanparams structure. 410 * Status is set to 0 if no problems were found; otherwise 411 * a bitmask of IEEE80211_BPARSE_* items is returned that 412 * describes the problems detected. 413 */ 414 int 415 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 416 struct ieee80211_scanparams *scan) 417 { 418 struct ieee80211vap *vap = ni->ni_vap; 419 struct ieee80211com *ic = ni->ni_ic; 420 struct ieee80211_frame *wh; 421 uint8_t *frm, *efrm; 422 423 wh = mtod(m, struct ieee80211_frame *); 424 frm = (uint8_t *)&wh[1]; 425 efrm = mtod(m, uint8_t *) + m->m_len; 426 scan->status = 0; 427 /* 428 * beacon/probe response frame format 429 * [8] time stamp 430 * [2] beacon interval 431 * [2] capability information 432 * [tlv] ssid 433 * [tlv] supported rates 434 * [tlv] country information 435 * [tlv] channel switch announcement (CSA) 436 * [tlv] parameter set (FH/DS) 437 * [tlv] erp information 438 * [tlv] extended supported rates 439 * [tlv] WME 440 * [tlv] WPA or RSN 441 * [tlv] HT capabilities 442 * [tlv] HT information 443 * [tlv] Atheros capabilities 444 * [tlv] Mesh ID 445 * [tlv] Mesh Configuration 446 */ 447 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 448 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 449 memset(scan, 0, sizeof(*scan)); 450 scan->tstamp = frm; frm += 8; 451 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 452 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 453 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 454 scan->chan = scan->bchan; 455 scan->ies = frm; 456 scan->ies_len = efrm - frm; 457 458 while (efrm - frm > 1) { 459 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 460 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 461 switch (*frm) { 462 case IEEE80211_ELEMID_SSID: 463 scan->ssid = frm; 464 break; 465 case IEEE80211_ELEMID_RATES: 466 scan->rates = frm; 467 break; 468 case IEEE80211_ELEMID_COUNTRY: 469 scan->country = frm; 470 break; 471 case IEEE80211_ELEMID_CSA: 472 scan->csa = frm; 473 break; 474 case IEEE80211_ELEMID_FHPARMS: 475 if (ic->ic_phytype == IEEE80211_T_FH) { 476 scan->fhdwell = LE_READ_2(&frm[2]); 477 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 478 scan->fhindex = frm[6]; 479 } 480 break; 481 case IEEE80211_ELEMID_DSPARMS: 482 /* 483 * XXX hack this since depending on phytype 484 * is problematic for multi-mode devices. 485 */ 486 if (ic->ic_phytype != IEEE80211_T_FH) 487 scan->chan = frm[2]; 488 break; 489 case IEEE80211_ELEMID_TIM: 490 /* XXX ATIM? */ 491 scan->tim = frm; 492 scan->timoff = frm - mtod(m, uint8_t *); 493 break; 494 case IEEE80211_ELEMID_IBSSPARMS: 495 case IEEE80211_ELEMID_CFPARMS: 496 case IEEE80211_ELEMID_PWRCNSTR: 497 /* NB: avoid debugging complaints */ 498 break; 499 case IEEE80211_ELEMID_XRATES: 500 scan->xrates = frm; 501 break; 502 case IEEE80211_ELEMID_ERP: 503 if (frm[1] != 1) { 504 IEEE80211_DISCARD_IE(vap, 505 IEEE80211_MSG_ELEMID, wh, "ERP", 506 "bad len %u", frm[1]); 507 vap->iv_stats.is_rx_elem_toobig++; 508 break; 509 } 510 scan->erp = frm[2] | 0x100; 511 break; 512 case IEEE80211_ELEMID_HTCAP: 513 scan->htcap = frm; 514 break; 515 case IEEE80211_ELEMID_RSN: 516 scan->rsn = frm; 517 break; 518 case IEEE80211_ELEMID_HTINFO: 519 scan->htinfo = frm; 520 break; 521 #ifdef IEEE80211_SUPPORT_MESH 522 case IEEE80211_ELEMID_MESHID: 523 scan->meshid = frm; 524 break; 525 case IEEE80211_ELEMID_MESHCONF: 526 scan->meshconf = frm; 527 break; 528 #endif 529 case IEEE80211_ELEMID_VENDOR: 530 if (iswpaoui(frm)) 531 scan->wpa = frm; 532 else if (iswmeparam(frm) || iswmeinfo(frm)) 533 scan->wme = frm; 534 #ifdef IEEE80211_SUPPORT_SUPERG 535 else if (isatherosoui(frm)) 536 scan->ath = frm; 537 #endif 538 #ifdef IEEE80211_SUPPORT_TDMA 539 else if (istdmaoui(frm)) 540 scan->tdma = frm; 541 #endif 542 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 543 /* 544 * Accept pre-draft HT ie's if the 545 * standard ones have not been seen. 546 */ 547 if (ishtcapoui(frm)) { 548 if (scan->htcap == NULL) 549 scan->htcap = frm; 550 } else if (ishtinfooui(frm)) { 551 if (scan->htinfo == NULL) 552 scan->htcap = frm; 553 } 554 } 555 break; 556 default: 557 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 558 wh, "unhandled", 559 "id %u, len %u", *frm, frm[1]); 560 vap->iv_stats.is_rx_elem_unknown++; 561 break; 562 } 563 frm += frm[1] + 2; 564 } 565 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 566 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 567 if (scan->rates != NULL && scan->xrates != NULL) { 568 /* 569 * NB: don't process XRATES if RATES is missing. This 570 * avoids a potential null ptr deref and should be ok 571 * as the return code will already note RATES is missing 572 * (so callers shouldn't otherwise process the frame). 573 */ 574 IEEE80211_VERIFY_ELEMENT(scan->xrates, 575 IEEE80211_RATE_MAXSIZE - scan->rates[1], 576 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 577 } 578 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 579 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 580 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 581 /* 582 * Frame was received on a channel different from the 583 * one indicated in the DS params element id; 584 * silently discard it. 585 * 586 * NB: this can happen due to signal leakage. 587 * But we should take it for FH phy because 588 * the rssi value should be correct even for 589 * different hop pattern in FH. 590 */ 591 IEEE80211_DISCARD(vap, 592 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 593 wh, NULL, "for off-channel %u", scan->chan); 594 vap->iv_stats.is_rx_chanmismatch++; 595 scan->status |= IEEE80211_BPARSE_OFFCHAN; 596 } 597 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 598 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 599 IEEE80211_DISCARD(vap, 600 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 601 wh, NULL, "bogus beacon interval %u", scan->bintval); 602 vap->iv_stats.is_rx_badbintval++; 603 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 604 } 605 if (scan->country != NULL) { 606 /* 607 * Validate we have at least enough data to extract 608 * the country code. Not sure if we should return an 609 * error instead of discarding the IE; consider this 610 * being lenient as we don't depend on the data for 611 * correct operation. 612 */ 613 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 614 scan->country = NULL); 615 } 616 if (scan->csa != NULL) { 617 /* 618 * Validate Channel Switch Announcement; this must 619 * be the correct length or we toss the frame. 620 */ 621 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 622 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 623 } 624 /* 625 * Process HT ie's. This is complicated by our 626 * accepting both the standard ie's and the pre-draft 627 * vendor OUI ie's that some vendors still use/require. 628 */ 629 if (scan->htcap != NULL) { 630 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 631 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 632 4 + sizeof(struct ieee80211_ie_htcap)-2 : 633 sizeof(struct ieee80211_ie_htcap)-2, 634 scan->htcap = NULL); 635 } 636 if (scan->htinfo != NULL) { 637 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 638 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 639 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 640 sizeof(struct ieee80211_ie_htinfo)-2, 641 scan->htinfo = NULL); 642 } 643 return scan->status; 644 } 645 646 /* 647 * Parse an Action frame. Return 0 on success, non-zero on failure. 648 */ 649 int 650 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 651 { 652 struct ieee80211vap *vap = ni->ni_vap; 653 const struct ieee80211_action *ia; 654 struct ieee80211_frame *wh; 655 uint8_t *frm, *efrm; 656 657 /* 658 * action frame format: 659 * [1] category 660 * [1] action 661 * [tlv] parameters 662 */ 663 wh = mtod(m, struct ieee80211_frame *); 664 frm = (u_int8_t *)&wh[1]; 665 efrm = mtod(m, u_int8_t *) + m->m_len; 666 IEEE80211_VERIFY_LENGTH(efrm - frm, 667 sizeof(struct ieee80211_action), return EINVAL); 668 ia = (const struct ieee80211_action *) frm; 669 670 vap->iv_stats.is_rx_action++; 671 IEEE80211_NODE_STAT(ni, rx_action); 672 673 /* verify frame payloads but defer processing */ 674 /* XXX maybe push this to method */ 675 switch (ia->ia_category) { 676 case IEEE80211_ACTION_CAT_BA: 677 switch (ia->ia_action) { 678 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 679 IEEE80211_VERIFY_LENGTH(efrm - frm, 680 sizeof(struct ieee80211_action_ba_addbarequest), 681 return EINVAL); 682 break; 683 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 684 IEEE80211_VERIFY_LENGTH(efrm - frm, 685 sizeof(struct ieee80211_action_ba_addbaresponse), 686 return EINVAL); 687 break; 688 case IEEE80211_ACTION_BA_DELBA: 689 IEEE80211_VERIFY_LENGTH(efrm - frm, 690 sizeof(struct ieee80211_action_ba_delba), 691 return EINVAL); 692 break; 693 } 694 break; 695 case IEEE80211_ACTION_CAT_HT: 696 switch (ia->ia_action) { 697 case IEEE80211_ACTION_HT_TXCHWIDTH: 698 IEEE80211_VERIFY_LENGTH(efrm - frm, 699 sizeof(struct ieee80211_action_ht_txchwidth), 700 return EINVAL); 701 break; 702 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 703 IEEE80211_VERIFY_LENGTH(efrm - frm, 704 sizeof(struct ieee80211_action_ht_mimopowersave), 705 return EINVAL); 706 break; 707 } 708 break; 709 } 710 return 0; 711 } 712 713 /* 714 * Modules may be compiled with debugging even if wlan isn't 715 */ 716 /*#ifdef IEEE80211_DEBUG*/ 717 #if 1 718 /* 719 * Debugging support. 720 */ 721 void 722 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 723 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 724 { 725 char ethstr[ETHER_ADDRSTRLEN + 1]; 726 727 kprintf("[%s] discard %s frame, ssid mismatch: ", 728 kether_ntoa(mac, ethstr), tag); 729 ieee80211_print_essid(ssid + 2, ssid[1]); 730 kprintf("\n"); 731 } 732 733 /* 734 * Return the bssid of a frame. 735 */ 736 static const uint8_t * 737 ieee80211_getbssid(const struct ieee80211vap *vap, const struct ieee80211_frame *wh) 738 { 739 if (vap->iv_opmode == IEEE80211_M_STA) 740 return wh->i_addr2; 741 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 742 return wh->i_addr1; 743 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 744 return wh->i_addr1; 745 return wh->i_addr3; 746 } 747 748 #include <machine/stdarg.h> 749 750 void 751 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 752 { 753 char buf[128]; /* XXX */ 754 __va_list ap; 755 756 __va_start(ap, fmt); 757 kvsnprintf(buf, sizeof(buf), fmt, ap); 758 __va_end(ap); 759 760 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 761 } 762 763 void 764 ieee80211_note_frame(const struct ieee80211vap *vap, 765 const struct ieee80211_frame *wh, 766 const char *fmt, ...) 767 { 768 char buf[128]; /* XXX */ 769 __va_list ap; 770 char ethstr[ETHER_ADDRSTRLEN + 1]; 771 772 __va_start(ap, fmt); 773 kvsnprintf(buf, sizeof(buf), fmt, ap); 774 __va_end(ap); 775 if_printf(vap->iv_ifp, "[%s] %s\n", 776 kether_ntoa(ieee80211_getbssid(vap, wh), ethstr), buf); 777 } 778 779 void 780 ieee80211_note_mac(const struct ieee80211vap *vap, 781 const uint8_t mac[IEEE80211_ADDR_LEN], 782 const char *fmt, ...) 783 { 784 char buf[128]; /* XXX */ 785 __va_list ap; 786 char ethstr[ETHER_ADDRSTRLEN + 1]; 787 788 __va_start(ap, fmt); 789 kvsnprintf(buf, sizeof(buf), fmt, ap); 790 __va_end(ap); 791 if_printf(vap->iv_ifp, "[%s] %s\n", kether_ntoa(mac, ethstr), buf); 792 } 793 794 void 795 ieee80211_discard_frame(const struct ieee80211vap *vap, 796 const struct ieee80211_frame *wh, 797 const char *type, const char *fmt, ...) 798 { 799 __va_list ap; 800 char ethstr[ETHER_ADDRSTRLEN + 1]; 801 802 if_printf(vap->iv_ifp, "[%s] discard ", 803 kether_ntoa(ieee80211_getbssid(vap, wh), ethstr)); 804 if (type == NULL) { 805 kprintf("%s frame, ", ieee80211_mgt_subtype_name[ 806 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 807 IEEE80211_FC0_SUBTYPE_SHIFT]); 808 } else 809 kprintf("%s frame, ", type); 810 __va_start(ap, fmt); 811 kvprintf(fmt, ap); 812 __va_end(ap); 813 kprintf("\n"); 814 } 815 816 void 817 ieee80211_discard_ie(const struct ieee80211vap *vap, 818 const struct ieee80211_frame *wh, 819 const char *type, const char *fmt, ...) 820 { 821 __va_list ap; 822 char ethstr[ETHER_ADDRSTRLEN + 1]; 823 824 if_printf(vap->iv_ifp, "[%s] discard ", 825 kether_ntoa(ieee80211_getbssid(vap, wh), ethstr)); 826 if (type != NULL) 827 kprintf("%s information element, ", type); 828 else 829 kprintf("information element, "); 830 __va_start(ap, fmt); 831 kvprintf(fmt, ap); 832 __va_end(ap); 833 kprintf("\n"); 834 } 835 836 void 837 ieee80211_discard_mac(const struct ieee80211vap *vap, 838 const uint8_t mac[IEEE80211_ADDR_LEN], 839 const char *type, const char *fmt, ...) 840 { 841 __va_list ap; 842 char ethstr[ETHER_ADDRSTRLEN + 1]; 843 844 if_printf(vap->iv_ifp, "[%s] discard ", kether_ntoa(mac, ethstr)); 845 if (type != NULL) 846 kprintf("%s frame, ", type); 847 else 848 kprintf("frame, "); 849 __va_start(ap, fmt); 850 kvprintf(fmt, ap); 851 __va_end(ap); 852 kprintf("\n"); 853 } 854 #endif /* IEEE80211_DEBUG */ 855