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 #include <net/ethernet.h> 57 #endif 58 59 int 60 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf) 61 { 62 struct ieee80211vap *vap; 63 int type = -1; 64 65 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */ 66 67 /* XXX locking */ 68 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 69 struct ieee80211_node *ni; 70 struct mbuf *mcopy; 71 72 /* NB: could check for IFF_UP but this is cheaper */ 73 if (vap->iv_state == IEEE80211_S_INIT) 74 continue; 75 /* 76 * WDS vap's only receive directed traffic from the 77 * station at the ``far end''. That traffic should 78 * be passed through the AP vap the station is associated 79 * to--so don't spam them with mcast frames. 80 */ 81 if (vap->iv_opmode == IEEE80211_M_WDS) 82 continue; 83 if (TAILQ_NEXT(vap, iv_next) != NULL) { 84 /* 85 * Packet contents are changed by ieee80211_decap 86 * so do a deep copy of the packet. 87 */ 88 mcopy = m_dup(m, MB_DONTWAIT); 89 if (mcopy == NULL) { 90 /* XXX stat+msg */ 91 continue; 92 } 93 } else { 94 mcopy = m; 95 m = NULL; 96 } 97 ni = ieee80211_ref_node(vap->iv_bss); 98 type = ieee80211_input(ni, mcopy, rssi, nf); 99 ieee80211_free_node(ni); 100 } 101 if (m != NULL) /* no vaps, reclaim mbuf */ 102 m_freem(m); 103 return type; 104 } 105 106 /* 107 * This function reassembles fragments. 108 * 109 * XXX should handle 3 concurrent reassemblies per-spec. 110 */ 111 struct mbuf * 112 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace) 113 { 114 struct ieee80211vap *vap = ni->ni_vap; 115 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 116 struct ieee80211_frame *lwh; 117 uint16_t rxseq; 118 uint8_t fragno; 119 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 120 struct mbuf *mfrag; 121 122 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 123 124 rxseq = le16toh(*(uint16_t *)wh->i_seq); 125 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 126 127 /* Quick way out, if there's nothing to defragment */ 128 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 129 return m; 130 131 /* 132 * Remove frag to insure it doesn't get reaped by timer. 133 */ 134 if (ni->ni_table == NULL) { 135 /* 136 * Should never happen. If the node is orphaned (not in 137 * the table) then input packets should not reach here. 138 * Otherwise, a concurrent request that yanks the table 139 * should be blocked by other interlocking and/or by first 140 * shutting the driver down. Regardless, be defensive 141 * here and just bail 142 */ 143 /* XXX need msg+stat */ 144 m_freem(m); 145 return NULL; 146 } 147 mfrag = ni->ni_rxfrag[0]; 148 ni->ni_rxfrag[0] = NULL; 149 150 /* 151 * Validate new fragment is in order and 152 * related to the previous ones. 153 */ 154 if (mfrag != NULL) { 155 uint16_t last_rxseq; 156 157 lwh = mtod(mfrag, struct ieee80211_frame *); 158 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 159 /* NB: check seq # and frag together */ 160 if (rxseq != last_rxseq+1 || 161 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || 162 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 163 /* 164 * Unrelated fragment or no space for it, 165 * clear current fragments. 166 */ 167 m_freem(mfrag); 168 mfrag = NULL; 169 } 170 } 171 172 if (mfrag == NULL) { 173 if (fragno != 0) { /* !first fragment, discard */ 174 vap->iv_stats.is_rx_defrag++; 175 IEEE80211_NODE_STAT(ni, rx_defrag); 176 m_freem(m); 177 return NULL; 178 } 179 mfrag = m; 180 } else { /* concatenate */ 181 m_adj(m, hdrspace); /* strip header */ 182 m_cat(mfrag, m); 183 /* NB: m_cat doesn't update the packet header */ 184 mfrag->m_pkthdr.len += m->m_pkthdr.len; 185 /* track last seqnum and fragno */ 186 lwh = mtod(mfrag, struct ieee80211_frame *); 187 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 188 } 189 if (more_frag) { /* more to come, save */ 190 ni->ni_rxfragstamp = ticks; 191 ni->ni_rxfrag[0] = mfrag; 192 mfrag = NULL; 193 } 194 return mfrag; 195 } 196 197 void 198 ieee80211_deliver_data(struct ieee80211vap *vap, 199 struct ieee80211_node *ni, struct mbuf *m) 200 { 201 struct ether_header *eh = mtod(m, struct ether_header *); 202 struct ifnet *ifp = vap->iv_ifp; 203 204 /* clear driver/net80211 flags before passing up */ 205 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST); 206 207 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 208 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 209 /* 210 * Do accounting. 211 */ 212 IFNET_STAT_INC(ifp, ipackets, 1); 213 IEEE80211_NODE_STAT(ni, rx_data); 214 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 215 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 216 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 217 IEEE80211_NODE_STAT(ni, rx_mcast); 218 } else 219 IEEE80211_NODE_STAT(ni, rx_ucast); 220 m->m_pkthdr.rcvif = ifp; 221 222 if (ni->ni_vlan != 0) { 223 /* attach vlan tag */ 224 m->m_pkthdr.ether_vlantag = ni->ni_vlan; 225 m->m_flags |= M_VLANTAG; 226 } 227 ifp->if_input(ifp, m); 228 } 229 230 struct mbuf * 231 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 232 { 233 struct ieee80211_qosframe_addr4 wh; 234 struct ether_header *eh; 235 struct llc *llc; 236 237 KASSERT(hdrlen <= sizeof(wh), 238 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 239 240 if (m->m_len < hdrlen + sizeof(*llc) && 241 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 242 vap->iv_stats.is_rx_tooshort++; 243 /* XXX msg */ 244 return NULL; 245 } 246 memcpy(&wh, mtod(m, caddr_t), hdrlen); 247 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 248 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 249 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 250 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 251 !(llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 252 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 253 llc = NULL; 254 } else { 255 m_adj(m, hdrlen - sizeof(*eh)); 256 } 257 eh = mtod(m, struct ether_header *); 258 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 259 case IEEE80211_FC1_DIR_NODS: 260 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 261 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 262 break; 263 case IEEE80211_FC1_DIR_TODS: 264 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 265 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 266 break; 267 case IEEE80211_FC1_DIR_FROMDS: 268 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 269 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 270 break; 271 case IEEE80211_FC1_DIR_DSTODS: 272 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 273 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 274 break; 275 } 276 #ifdef ALIGNED_POINTER 277 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 278 m = ieee80211_realign(vap, m, sizeof(*eh)); 279 if (m == NULL) 280 return NULL; 281 } 282 #endif /* ALIGNED_POINTER */ 283 if (llc != NULL) { 284 eh = mtod(m, struct ether_header *); 285 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 286 } 287 return m; 288 } 289 290 /* 291 * Decap a frame encapsulated in a fast-frame/A-MSDU. 292 */ 293 struct mbuf * 294 ieee80211_decap1(struct mbuf *m, int *framelen) 295 { 296 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 297 struct ether_header *eh; 298 struct llc *llc; 299 300 /* 301 * The frame has an 802.3 header followed by an 802.2 302 * LLC header. The encapsulated frame length is in the 303 * first header type field; save that and overwrite it 304 * with the true type field found in the second. Then 305 * copy the 802.3 header up to where it belongs and 306 * adjust the mbuf contents to remove the void. 307 */ 308 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 309 return NULL; 310 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 311 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 312 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 313 + sizeof(struct ether_header) - sizeof(struct llc); 314 eh->ether_type = llc->llc_un.type_snap.ether_type; 315 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 316 sizeof(struct ether_header)); 317 m_adj(m, sizeof(struct llc)); 318 return m; 319 #undef FF_LLC_SIZE 320 } 321 322 /* 323 * Install received rate set information in the node's state block. 324 */ 325 int 326 ieee80211_setup_rates(struct ieee80211_node *ni, 327 const uint8_t *rates, const uint8_t *xrates, int flags) 328 { 329 struct ieee80211vap *vap = ni->ni_vap; 330 struct ieee80211_rateset *rs = &ni->ni_rates; 331 332 memset(rs, 0, sizeof(*rs)); 333 rs->rs_nrates = rates[1]; 334 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 335 if (xrates != NULL) { 336 uint8_t nxrates; 337 /* 338 * Tack on 11g extended supported rate element. 339 */ 340 nxrates = xrates[1]; 341 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 342 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 343 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 344 "extended rate set too large; only using " 345 "%u of %u rates", nxrates, xrates[1]); 346 vap->iv_stats.is_rx_rstoobig++; 347 } 348 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 349 rs->rs_nrates += nxrates; 350 } 351 return ieee80211_fix_rate(ni, rs, flags); 352 } 353 354 /* 355 * Send a management frame error response to the specified 356 * station. If ni is associated with the station then use 357 * it; otherwise allocate a temporary node suitable for 358 * transmitting the frame and then free the reference so 359 * it will go away as soon as the frame has been transmitted. 360 */ 361 void 362 ieee80211_send_error(struct ieee80211_node *ni, 363 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 364 { 365 struct ieee80211vap *vap = ni->ni_vap; 366 int istmp; 367 368 if (ni == vap->iv_bss) { 369 if (vap->iv_state != IEEE80211_S_RUN) { 370 /* 371 * XXX hack until we get rid of this routine. 372 * We can be called prior to the vap reaching 373 * run state under certain conditions in which 374 * case iv_bss->ni_chan will not be setup. 375 * Check for this explicitly and and just ignore 376 * the request. 377 */ 378 return; 379 } 380 ni = ieee80211_tmp_node(vap, mac); 381 if (ni == NULL) { 382 /* XXX msg */ 383 return; 384 } 385 istmp = 1; 386 } else 387 istmp = 0; 388 IEEE80211_SEND_MGMT(ni, subtype, arg); 389 if (istmp) 390 ieee80211_free_node(ni); 391 } 392 393 int 394 ieee80211_alloc_challenge(struct ieee80211_node *ni) 395 { 396 if (ni->ni_challenge == NULL) 397 ni->ni_challenge = (uint32_t *) kmalloc(IEEE80211_CHALLENGE_LEN, 398 M_80211_NODE, M_INTWAIT); 399 if (ni->ni_challenge == NULL) { 400 IEEE80211_NOTE(ni->ni_vap, 401 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 402 "%s", "shared key challenge alloc failed"); 403 /* XXX statistic */ 404 } 405 return (ni->ni_challenge != NULL); 406 } 407 408 /* 409 * Parse a Beacon or ProbeResponse frame and return the 410 * useful information in an ieee80211_scanparams structure. 411 * Status is set to 0 if no problems were found; otherwise 412 * a bitmask of IEEE80211_BPARSE_* items is returned that 413 * describes the problems detected. 414 */ 415 int 416 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 417 struct ieee80211_scanparams *scan) 418 { 419 struct ieee80211vap *vap = ni->ni_vap; 420 struct ieee80211com *ic = ni->ni_ic; 421 struct ieee80211_frame *wh; 422 uint8_t *frm, *efrm; 423 424 wh = mtod(m, struct ieee80211_frame *); 425 frm = (uint8_t *)&wh[1]; 426 efrm = mtod(m, uint8_t *) + m->m_len; 427 scan->status = 0; 428 /* 429 * beacon/probe response frame format 430 * [8] time stamp 431 * [2] beacon interval 432 * [2] capability information 433 * [tlv] ssid 434 * [tlv] supported rates 435 * [tlv] country information 436 * [tlv] channel switch announcement (CSA) 437 * [tlv] parameter set (FH/DS) 438 * [tlv] erp information 439 * [tlv] extended supported rates 440 * [tlv] WME 441 * [tlv] WPA or RSN 442 * [tlv] HT capabilities 443 * [tlv] HT information 444 * [tlv] Atheros capabilities 445 * [tlv] Mesh ID 446 * [tlv] Mesh Configuration 447 */ 448 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 449 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 450 memset(scan, 0, sizeof(*scan)); 451 scan->tstamp = frm; frm += 8; 452 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 453 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 454 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 455 scan->chan = scan->bchan; 456 scan->ies = frm; 457 scan->ies_len = efrm - frm; 458 459 while (efrm - frm > 1) { 460 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 461 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 462 switch (*frm) { 463 case IEEE80211_ELEMID_SSID: 464 scan->ssid = frm; 465 break; 466 case IEEE80211_ELEMID_RATES: 467 scan->rates = frm; 468 break; 469 case IEEE80211_ELEMID_COUNTRY: 470 scan->country = frm; 471 break; 472 case IEEE80211_ELEMID_CSA: 473 scan->csa = frm; 474 break; 475 case IEEE80211_ELEMID_FHPARMS: 476 if (ic->ic_phytype == IEEE80211_T_FH) { 477 scan->fhdwell = LE_READ_2(&frm[2]); 478 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 479 scan->fhindex = frm[6]; 480 } 481 break; 482 case IEEE80211_ELEMID_DSPARMS: 483 /* 484 * XXX hack this since depending on phytype 485 * is problematic for multi-mode devices. 486 */ 487 if (ic->ic_phytype != IEEE80211_T_FH) 488 scan->chan = frm[2]; 489 break; 490 case IEEE80211_ELEMID_TIM: 491 /* XXX ATIM? */ 492 scan->tim = frm; 493 scan->timoff = frm - mtod(m, uint8_t *); 494 break; 495 case IEEE80211_ELEMID_IBSSPARMS: 496 case IEEE80211_ELEMID_CFPARMS: 497 case IEEE80211_ELEMID_PWRCNSTR: 498 /* NB: avoid debugging complaints */ 499 break; 500 case IEEE80211_ELEMID_XRATES: 501 scan->xrates = frm; 502 break; 503 case IEEE80211_ELEMID_ERP: 504 if (frm[1] != 1) { 505 IEEE80211_DISCARD_IE(vap, 506 IEEE80211_MSG_ELEMID, wh, "ERP", 507 "bad len %u", frm[1]); 508 vap->iv_stats.is_rx_elem_toobig++; 509 break; 510 } 511 scan->erp = frm[2] | 0x100; 512 break; 513 case IEEE80211_ELEMID_HTCAP: 514 scan->htcap = frm; 515 break; 516 case IEEE80211_ELEMID_RSN: 517 scan->rsn = frm; 518 break; 519 case IEEE80211_ELEMID_HTINFO: 520 scan->htinfo = frm; 521 break; 522 #ifdef IEEE80211_SUPPORT_MESH 523 case IEEE80211_ELEMID_MESHID: 524 scan->meshid = frm; 525 break; 526 case IEEE80211_ELEMID_MESHCONF: 527 scan->meshconf = frm; 528 break; 529 #endif 530 case IEEE80211_ELEMID_VENDOR: 531 if (iswpaoui(frm)) 532 scan->wpa = frm; 533 else if (iswmeparam(frm) || iswmeinfo(frm)) 534 scan->wme = frm; 535 #ifdef IEEE80211_SUPPORT_SUPERG 536 else if (isatherosoui(frm)) 537 scan->ath = frm; 538 #endif 539 #ifdef IEEE80211_SUPPORT_TDMA 540 else if (istdmaoui(frm)) 541 scan->tdma = frm; 542 #endif 543 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 544 /* 545 * Accept pre-draft HT ie's if the 546 * standard ones have not been seen. 547 */ 548 if (ishtcapoui(frm)) { 549 if (scan->htcap == NULL) 550 scan->htcap = frm; 551 } else if (ishtinfooui(frm)) { 552 if (scan->htinfo == NULL) 553 scan->htcap = frm; 554 } 555 } 556 break; 557 default: 558 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 559 wh, "unhandled", 560 "id %u, len %u", *frm, frm[1]); 561 vap->iv_stats.is_rx_elem_unknown++; 562 break; 563 } 564 frm += frm[1] + 2; 565 } 566 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 567 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 568 if (scan->rates != NULL && scan->xrates != NULL) { 569 /* 570 * NB: don't process XRATES if RATES is missing. This 571 * avoids a potential null ptr deref and should be ok 572 * as the return code will already note RATES is missing 573 * (so callers shouldn't otherwise process the frame). 574 */ 575 IEEE80211_VERIFY_ELEMENT(scan->xrates, 576 IEEE80211_RATE_MAXSIZE - scan->rates[1], 577 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 578 } 579 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 580 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 581 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 582 /* 583 * Frame was received on a channel different from the 584 * one indicated in the DS params element id; 585 * silently discard it. 586 * 587 * NB: this can happen due to signal leakage. 588 * But we should take it for FH phy because 589 * the rssi value should be correct even for 590 * different hop pattern in FH. 591 */ 592 IEEE80211_DISCARD(vap, 593 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 594 wh, NULL, "for off-channel %u", scan->chan); 595 vap->iv_stats.is_rx_chanmismatch++; 596 scan->status |= IEEE80211_BPARSE_OFFCHAN; 597 } 598 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 599 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 600 IEEE80211_DISCARD(vap, 601 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 602 wh, NULL, "bogus beacon interval %u", scan->bintval); 603 vap->iv_stats.is_rx_badbintval++; 604 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 605 } 606 if (scan->country != NULL) { 607 /* 608 * Validate we have at least enough data to extract 609 * the country code. Not sure if we should return an 610 * error instead of discarding the IE; consider this 611 * being lenient as we don't depend on the data for 612 * correct operation. 613 */ 614 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 615 scan->country = NULL); 616 } 617 if (scan->csa != NULL) { 618 /* 619 * Validate Channel Switch Announcement; this must 620 * be the correct length or we toss the frame. 621 */ 622 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 623 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 624 } 625 /* 626 * Process HT ie's. This is complicated by our 627 * accepting both the standard ie's and the pre-draft 628 * vendor OUI ie's that some vendors still use/require. 629 */ 630 if (scan->htcap != NULL) { 631 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 632 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 633 4 + sizeof(struct ieee80211_ie_htcap)-2 : 634 sizeof(struct ieee80211_ie_htcap)-2, 635 scan->htcap = NULL); 636 } 637 if (scan->htinfo != NULL) { 638 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 639 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 640 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 641 sizeof(struct ieee80211_ie_htinfo)-2, 642 scan->htinfo = NULL); 643 } 644 return scan->status; 645 } 646 647 /* 648 * Parse an Action frame. Return 0 on success, non-zero on failure. 649 */ 650 int 651 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 652 { 653 struct ieee80211vap *vap = ni->ni_vap; 654 const struct ieee80211_action *ia; 655 struct ieee80211_frame *wh; 656 uint8_t *frm, *efrm; 657 658 /* 659 * action frame format: 660 * [1] category 661 * [1] action 662 * [tlv] parameters 663 */ 664 wh = mtod(m, struct ieee80211_frame *); 665 frm = (u_int8_t *)&wh[1]; 666 efrm = mtod(m, u_int8_t *) + m->m_len; 667 IEEE80211_VERIFY_LENGTH(efrm - frm, 668 sizeof(struct ieee80211_action), return EINVAL); 669 ia = (const struct ieee80211_action *) frm; 670 671 vap->iv_stats.is_rx_action++; 672 IEEE80211_NODE_STAT(ni, rx_action); 673 674 /* verify frame payloads but defer processing */ 675 /* XXX maybe push this to method */ 676 switch (ia->ia_category) { 677 case IEEE80211_ACTION_CAT_BA: 678 switch (ia->ia_action) { 679 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 680 IEEE80211_VERIFY_LENGTH(efrm - frm, 681 sizeof(struct ieee80211_action_ba_addbarequest), 682 return EINVAL); 683 break; 684 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 685 IEEE80211_VERIFY_LENGTH(efrm - frm, 686 sizeof(struct ieee80211_action_ba_addbaresponse), 687 return EINVAL); 688 break; 689 case IEEE80211_ACTION_BA_DELBA: 690 IEEE80211_VERIFY_LENGTH(efrm - frm, 691 sizeof(struct ieee80211_action_ba_delba), 692 return EINVAL); 693 break; 694 } 695 break; 696 case IEEE80211_ACTION_CAT_HT: 697 switch (ia->ia_action) { 698 case IEEE80211_ACTION_HT_TXCHWIDTH: 699 IEEE80211_VERIFY_LENGTH(efrm - frm, 700 sizeof(struct ieee80211_action_ht_txchwidth), 701 return EINVAL); 702 break; 703 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 704 IEEE80211_VERIFY_LENGTH(efrm - frm, 705 sizeof(struct ieee80211_action_ht_mimopowersave), 706 return EINVAL); 707 break; 708 } 709 break; 710 } 711 return 0; 712 } 713 714 /* 715 * Modules may be compiled with debugging even if wlan isn't 716 */ 717 /*#ifdef IEEE80211_DEBUG*/ 718 #if 1 719 /* 720 * Debugging support. 721 */ 722 void 723 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 724 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 725 { 726 char ethstr[ETHER_ADDRSTRLEN + 1]; 727 728 kprintf("[%s] discard %s frame, ssid mismatch: ", 729 kether_ntoa(mac, ethstr), tag); 730 ieee80211_print_essid(ssid + 2, ssid[1]); 731 kprintf("\n"); 732 } 733 734 /* 735 * Return the bssid of a frame. 736 */ 737 static const uint8_t * 738 ieee80211_getbssid(const struct ieee80211vap *vap, const struct ieee80211_frame *wh) 739 { 740 if (vap->iv_opmode == IEEE80211_M_STA) 741 return wh->i_addr2; 742 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 743 return wh->i_addr1; 744 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 745 return wh->i_addr1; 746 return wh->i_addr3; 747 } 748 749 #include <machine/stdarg.h> 750 751 void 752 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 753 { 754 char buf[128]; /* XXX */ 755 __va_list ap; 756 757 __va_start(ap, fmt); 758 kvsnprintf(buf, sizeof(buf), fmt, ap); 759 __va_end(ap); 760 761 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 762 } 763 764 void 765 ieee80211_note_frame(const struct ieee80211vap *vap, 766 const struct ieee80211_frame *wh, 767 const char *fmt, ...) 768 { 769 char buf[128]; /* XXX */ 770 __va_list ap; 771 char ethstr[ETHER_ADDRSTRLEN + 1]; 772 773 __va_start(ap, fmt); 774 kvsnprintf(buf, sizeof(buf), fmt, ap); 775 __va_end(ap); 776 if_printf(vap->iv_ifp, "[%s] %s\n", 777 kether_ntoa(ieee80211_getbssid(vap, wh), ethstr), buf); 778 } 779 780 void 781 ieee80211_note_mac(const struct ieee80211vap *vap, 782 const uint8_t mac[IEEE80211_ADDR_LEN], 783 const char *fmt, ...) 784 { 785 char buf[128]; /* XXX */ 786 __va_list ap; 787 char ethstr[ETHER_ADDRSTRLEN + 1]; 788 789 __va_start(ap, fmt); 790 kvsnprintf(buf, sizeof(buf), fmt, ap); 791 __va_end(ap); 792 if_printf(vap->iv_ifp, "[%s] %s\n", kether_ntoa(mac, ethstr), buf); 793 } 794 795 void 796 ieee80211_discard_frame(const struct ieee80211vap *vap, 797 const struct ieee80211_frame *wh, 798 const char *type, const char *fmt, ...) 799 { 800 __va_list ap; 801 char ethstr[ETHER_ADDRSTRLEN + 1]; 802 803 if_printf(vap->iv_ifp, "[%s] discard ", 804 kether_ntoa(ieee80211_getbssid(vap, wh), ethstr)); 805 if (type == NULL) { 806 kprintf("%s frame, ", ieee80211_mgt_subtype_name[ 807 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 808 IEEE80211_FC0_SUBTYPE_SHIFT]); 809 } else 810 kprintf("%s frame, ", type); 811 __va_start(ap, fmt); 812 kvprintf(fmt, ap); 813 __va_end(ap); 814 kprintf("\n"); 815 } 816 817 void 818 ieee80211_discard_ie(const struct ieee80211vap *vap, 819 const struct ieee80211_frame *wh, 820 const char *type, const char *fmt, ...) 821 { 822 __va_list ap; 823 char ethstr[ETHER_ADDRSTRLEN + 1]; 824 825 if_printf(vap->iv_ifp, "[%s] discard ", 826 kether_ntoa(ieee80211_getbssid(vap, wh), ethstr)); 827 if (type != NULL) 828 kprintf("%s information element, ", type); 829 else 830 kprintf("information element, "); 831 __va_start(ap, fmt); 832 kvprintf(fmt, ap); 833 __va_end(ap); 834 kprintf("\n"); 835 } 836 837 void 838 ieee80211_discard_mac(const struct ieee80211vap *vap, 839 const uint8_t mac[IEEE80211_ADDR_LEN], 840 const char *type, const char *fmt, ...) 841 { 842 __va_list ap; 843 char ethstr[ETHER_ADDRSTRLEN + 1]; 844 845 if_printf(vap->iv_ifp, "[%s] discard ", kether_ntoa(mac, ethstr)); 846 if (type != NULL) 847 kprintf("%s frame, ", type); 848 else 849 kprintf("frame, "); 850 __va_start(ap, fmt); 851 kvprintf(fmt, ap); 852 __va_end(ap); 853 kprintf("\n"); 854 } 855 #endif /* IEEE80211_DEBUG */ 856