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