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 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 253 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 254 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 255 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 256 llc = NULL; 257 } else { 258 m_adj(m, hdrlen - sizeof(*eh)); 259 } 260 eh = mtod(m, struct ether_header *); 261 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 262 case IEEE80211_FC1_DIR_NODS: 263 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 264 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 265 break; 266 case IEEE80211_FC1_DIR_TODS: 267 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 268 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 269 break; 270 case IEEE80211_FC1_DIR_FROMDS: 271 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 272 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 273 break; 274 case IEEE80211_FC1_DIR_DSTODS: 275 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 276 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 277 break; 278 } 279 #ifdef ALIGNED_POINTER 280 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 281 m = ieee80211_realign(vap, m, sizeof(*eh)); 282 if (m == NULL) 283 return NULL; 284 } 285 #endif /* ALIGNED_POINTER */ 286 if (llc != NULL) { 287 eh = mtod(m, struct ether_header *); 288 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 289 } 290 return m; 291 } 292 293 /* 294 * Decap a frame encapsulated in a fast-frame/A-MSDU. 295 */ 296 struct mbuf * 297 ieee80211_decap1(struct mbuf *m, int *framelen) 298 { 299 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 300 struct ether_header *eh; 301 struct llc *llc; 302 303 /* 304 * The frame has an 802.3 header followed by an 802.2 305 * LLC header. The encapsulated frame length is in the 306 * first header type field; save that and overwrite it 307 * with the true type field found in the second. Then 308 * copy the 802.3 header up to where it belongs and 309 * adjust the mbuf contents to remove the void. 310 */ 311 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 312 return NULL; 313 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 314 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 315 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 316 + sizeof(struct ether_header) - sizeof(struct llc); 317 eh->ether_type = llc->llc_un.type_snap.ether_type; 318 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 319 sizeof(struct ether_header)); 320 m_adj(m, sizeof(struct llc)); 321 return m; 322 #undef FF_LLC_SIZE 323 } 324 325 /* 326 * Install received rate set information in the node's state block. 327 */ 328 int 329 ieee80211_setup_rates(struct ieee80211_node *ni, 330 const uint8_t *rates, const uint8_t *xrates, int flags) 331 { 332 struct ieee80211vap *vap = ni->ni_vap; 333 struct ieee80211_rateset *rs = &ni->ni_rates; 334 335 memset(rs, 0, sizeof(*rs)); 336 rs->rs_nrates = rates[1]; 337 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 338 if (xrates != NULL) { 339 uint8_t nxrates; 340 /* 341 * Tack on 11g extended supported rate element. 342 */ 343 nxrates = xrates[1]; 344 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 345 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 346 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 347 "extended rate set too large; only using " 348 "%u of %u rates", nxrates, xrates[1]); 349 vap->iv_stats.is_rx_rstoobig++; 350 } 351 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 352 rs->rs_nrates += nxrates; 353 } 354 return ieee80211_fix_rate(ni, rs, flags); 355 } 356 357 /* 358 * Send a management frame error response to the specified 359 * station. If ni is associated with the station then use 360 * it; otherwise allocate a temporary node suitable for 361 * transmitting the frame and then free the reference so 362 * it will go away as soon as the frame has been transmitted. 363 */ 364 void 365 ieee80211_send_error(struct ieee80211_node *ni, 366 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 367 { 368 struct ieee80211vap *vap = ni->ni_vap; 369 int istmp; 370 371 if (ni == vap->iv_bss) { 372 if (vap->iv_state != IEEE80211_S_RUN) { 373 /* 374 * XXX hack until we get rid of this routine. 375 * We can be called prior to the vap reaching 376 * run state under certain conditions in which 377 * case iv_bss->ni_chan will not be setup. 378 * Check for this explicitly and and just ignore 379 * the request. 380 */ 381 return; 382 } 383 ni = ieee80211_tmp_node(vap, mac); 384 if (ni == NULL) { 385 /* XXX msg */ 386 return; 387 } 388 istmp = 1; 389 } else 390 istmp = 0; 391 IEEE80211_SEND_MGMT(ni, subtype, arg); 392 if (istmp) 393 ieee80211_free_node(ni); 394 } 395 396 int 397 ieee80211_alloc_challenge(struct ieee80211_node *ni) 398 { 399 if (ni->ni_challenge == NULL) 400 ni->ni_challenge = (uint32_t *) kmalloc(IEEE80211_CHALLENGE_LEN, 401 M_80211_NODE, M_INTWAIT); 402 if (ni->ni_challenge == NULL) { 403 IEEE80211_NOTE(ni->ni_vap, 404 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 405 "%s", "shared key challenge alloc failed"); 406 /* XXX statistic */ 407 } 408 return (ni->ni_challenge != NULL); 409 } 410 411 /* 412 * Parse a Beacon or ProbeResponse frame and return the 413 * useful information in an ieee80211_scanparams structure. 414 * Status is set to 0 if no problems were found; otherwise 415 * a bitmask of IEEE80211_BPARSE_* items is returned that 416 * describes the problems detected. 417 */ 418 int 419 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 420 struct ieee80211_scanparams *scan) 421 { 422 struct ieee80211vap *vap = ni->ni_vap; 423 struct ieee80211com *ic = ni->ni_ic; 424 struct ieee80211_frame *wh; 425 uint8_t *frm, *efrm; 426 427 wh = mtod(m, struct ieee80211_frame *); 428 frm = (uint8_t *)&wh[1]; 429 efrm = mtod(m, uint8_t *) + m->m_len; 430 scan->status = 0; 431 /* 432 * beacon/probe response frame format 433 * [8] time stamp 434 * [2] beacon interval 435 * [2] capability information 436 * [tlv] ssid 437 * [tlv] supported rates 438 * [tlv] country information 439 * [tlv] channel switch announcement (CSA) 440 * [tlv] parameter set (FH/DS) 441 * [tlv] erp information 442 * [tlv] extended supported rates 443 * [tlv] WME 444 * [tlv] WPA or RSN 445 * [tlv] HT capabilities 446 * [tlv] HT information 447 * [tlv] Atheros capabilities 448 * [tlv] Mesh ID 449 * [tlv] Mesh Configuration 450 */ 451 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 452 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 453 memset(scan, 0, sizeof(*scan)); 454 scan->tstamp = frm; frm += 8; 455 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 456 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 457 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 458 scan->chan = scan->bchan; 459 scan->ies = frm; 460 scan->ies_len = efrm - frm; 461 462 while (efrm - frm > 1) { 463 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 464 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 465 switch (*frm) { 466 case IEEE80211_ELEMID_SSID: 467 scan->ssid = frm; 468 break; 469 case IEEE80211_ELEMID_RATES: 470 scan->rates = frm; 471 break; 472 case IEEE80211_ELEMID_COUNTRY: 473 scan->country = frm; 474 break; 475 case IEEE80211_ELEMID_CSA: 476 scan->csa = frm; 477 break; 478 case IEEE80211_ELEMID_FHPARMS: 479 if (ic->ic_phytype == IEEE80211_T_FH) { 480 scan->fhdwell = LE_READ_2(&frm[2]); 481 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 482 scan->fhindex = frm[6]; 483 } 484 break; 485 case IEEE80211_ELEMID_DSPARMS: 486 /* 487 * XXX hack this since depending on phytype 488 * is problematic for multi-mode devices. 489 */ 490 if (ic->ic_phytype != IEEE80211_T_FH) 491 scan->chan = frm[2]; 492 break; 493 case IEEE80211_ELEMID_TIM: 494 /* XXX ATIM? */ 495 scan->tim = frm; 496 scan->timoff = frm - mtod(m, uint8_t *); 497 break; 498 case IEEE80211_ELEMID_IBSSPARMS: 499 case IEEE80211_ELEMID_CFPARMS: 500 case IEEE80211_ELEMID_PWRCNSTR: 501 /* NB: avoid debugging complaints */ 502 break; 503 case IEEE80211_ELEMID_XRATES: 504 scan->xrates = frm; 505 break; 506 case IEEE80211_ELEMID_ERP: 507 if (frm[1] != 1) { 508 IEEE80211_DISCARD_IE(vap, 509 IEEE80211_MSG_ELEMID, wh, "ERP", 510 "bad len %u", frm[1]); 511 vap->iv_stats.is_rx_elem_toobig++; 512 break; 513 } 514 scan->erp = frm[2] | 0x100; 515 break; 516 case IEEE80211_ELEMID_HTCAP: 517 scan->htcap = frm; 518 break; 519 case IEEE80211_ELEMID_RSN: 520 scan->rsn = frm; 521 break; 522 case IEEE80211_ELEMID_HTINFO: 523 scan->htinfo = frm; 524 break; 525 #ifdef IEEE80211_SUPPORT_MESH 526 case IEEE80211_ELEMID_MESHID: 527 scan->meshid = frm; 528 break; 529 case IEEE80211_ELEMID_MESHCONF: 530 scan->meshconf = frm; 531 break; 532 #endif 533 case IEEE80211_ELEMID_VENDOR: 534 if (iswpaoui(frm)) 535 scan->wpa = frm; 536 else if (iswmeparam(frm) || iswmeinfo(frm)) 537 scan->wme = frm; 538 #ifdef IEEE80211_SUPPORT_SUPERG 539 else if (isatherosoui(frm)) 540 scan->ath = frm; 541 #endif 542 #ifdef IEEE80211_SUPPORT_TDMA 543 else if (istdmaoui(frm)) 544 scan->tdma = frm; 545 #endif 546 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 547 /* 548 * Accept pre-draft HT ie's if the 549 * standard ones have not been seen. 550 */ 551 if (ishtcapoui(frm)) { 552 if (scan->htcap == NULL) 553 scan->htcap = frm; 554 } else if (ishtinfooui(frm)) { 555 if (scan->htinfo == NULL) 556 scan->htcap = frm; 557 } 558 } 559 break; 560 default: 561 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 562 wh, "unhandled", 563 "id %u, len %u", *frm, frm[1]); 564 vap->iv_stats.is_rx_elem_unknown++; 565 break; 566 } 567 frm += frm[1] + 2; 568 } 569 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 570 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 571 if (scan->rates != NULL && scan->xrates != NULL) { 572 /* 573 * NB: don't process XRATES if RATES is missing. This 574 * avoids a potential null ptr deref and should be ok 575 * as the return code will already note RATES is missing 576 * (so callers shouldn't otherwise process the frame). 577 */ 578 IEEE80211_VERIFY_ELEMENT(scan->xrates, 579 IEEE80211_RATE_MAXSIZE - scan->rates[1], 580 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 581 } 582 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 583 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 584 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 585 /* 586 * Frame was received on a channel different from the 587 * one indicated in the DS params element id; 588 * silently discard it. 589 * 590 * NB: this can happen due to signal leakage. 591 * But we should take it for FH phy because 592 * the rssi value should be correct even for 593 * different hop pattern in FH. 594 */ 595 IEEE80211_DISCARD(vap, 596 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 597 wh, NULL, "for off-channel %u", scan->chan); 598 vap->iv_stats.is_rx_chanmismatch++; 599 scan->status |= IEEE80211_BPARSE_OFFCHAN; 600 } 601 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 602 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 603 IEEE80211_DISCARD(vap, 604 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 605 wh, NULL, "bogus beacon interval %u", scan->bintval); 606 vap->iv_stats.is_rx_badbintval++; 607 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 608 } 609 if (scan->country != NULL) { 610 /* 611 * Validate we have at least enough data to extract 612 * the country code. Not sure if we should return an 613 * error instead of discarding the IE; consider this 614 * being lenient as we don't depend on the data for 615 * correct operation. 616 */ 617 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 618 scan->country = NULL); 619 } 620 if (scan->csa != NULL) { 621 /* 622 * Validate Channel Switch Announcement; this must 623 * be the correct length or we toss the frame. 624 */ 625 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 626 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 627 } 628 /* 629 * Process HT ie's. This is complicated by our 630 * accepting both the standard ie's and the pre-draft 631 * vendor OUI ie's that some vendors still use/require. 632 */ 633 if (scan->htcap != NULL) { 634 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 635 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 636 4 + sizeof(struct ieee80211_ie_htcap)-2 : 637 sizeof(struct ieee80211_ie_htcap)-2, 638 scan->htcap = NULL); 639 } 640 if (scan->htinfo != NULL) { 641 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 642 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 643 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 644 sizeof(struct ieee80211_ie_htinfo)-2, 645 scan->htinfo = NULL); 646 } 647 return scan->status; 648 } 649 650 /* 651 * Parse an Action frame. Return 0 on success, non-zero on failure. 652 */ 653 int 654 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 655 { 656 struct ieee80211vap *vap = ni->ni_vap; 657 const struct ieee80211_action *ia; 658 struct ieee80211_frame *wh; 659 uint8_t *frm, *efrm; 660 661 /* 662 * action frame format: 663 * [1] category 664 * [1] action 665 * [tlv] parameters 666 */ 667 wh = mtod(m, struct ieee80211_frame *); 668 frm = (u_int8_t *)&wh[1]; 669 efrm = mtod(m, u_int8_t *) + m->m_len; 670 IEEE80211_VERIFY_LENGTH(efrm - frm, 671 sizeof(struct ieee80211_action), return EINVAL); 672 ia = (const struct ieee80211_action *) frm; 673 674 vap->iv_stats.is_rx_action++; 675 IEEE80211_NODE_STAT(ni, rx_action); 676 677 /* verify frame payloads but defer processing */ 678 /* XXX maybe push this to method */ 679 switch (ia->ia_category) { 680 case IEEE80211_ACTION_CAT_BA: 681 switch (ia->ia_action) { 682 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 683 IEEE80211_VERIFY_LENGTH(efrm - frm, 684 sizeof(struct ieee80211_action_ba_addbarequest), 685 return EINVAL); 686 break; 687 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 688 IEEE80211_VERIFY_LENGTH(efrm - frm, 689 sizeof(struct ieee80211_action_ba_addbaresponse), 690 return EINVAL); 691 break; 692 case IEEE80211_ACTION_BA_DELBA: 693 IEEE80211_VERIFY_LENGTH(efrm - frm, 694 sizeof(struct ieee80211_action_ba_delba), 695 return EINVAL); 696 break; 697 } 698 break; 699 case IEEE80211_ACTION_CAT_HT: 700 switch (ia->ia_action) { 701 case IEEE80211_ACTION_HT_TXCHWIDTH: 702 IEEE80211_VERIFY_LENGTH(efrm - frm, 703 sizeof(struct ieee80211_action_ht_txchwidth), 704 return EINVAL); 705 break; 706 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 707 IEEE80211_VERIFY_LENGTH(efrm - frm, 708 sizeof(struct ieee80211_action_ht_mimopowersave), 709 return EINVAL); 710 break; 711 } 712 break; 713 } 714 return 0; 715 } 716 717 /* 718 * Modules may be compiled with debugging even if wlan isn't 719 */ 720 /*#ifdef IEEE80211_DEBUG*/ 721 #if 1 722 /* 723 * Debugging support. 724 */ 725 void 726 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 727 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 728 { 729 kprintf("[%6D] discard %s frame, ssid mismatch: ", 730 mac, ":", tag); 731 ieee80211_print_essid(ssid + 2, ssid[1]); 732 kprintf("\n"); 733 } 734 735 /* 736 * Return the bssid of a frame. 737 */ 738 static const uint8_t * 739 ieee80211_getbssid(const struct ieee80211vap *vap, const struct ieee80211_frame *wh) 740 { 741 if (vap->iv_opmode == IEEE80211_M_STA) 742 return wh->i_addr2; 743 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 744 return wh->i_addr1; 745 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 746 return wh->i_addr1; 747 return wh->i_addr3; 748 } 749 750 #include <machine/stdarg.h> 751 752 void 753 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 754 { 755 char buf[128]; /* XXX */ 756 __va_list ap; 757 758 __va_start(ap, fmt); 759 kvsnprintf(buf, sizeof(buf), fmt, ap); 760 __va_end(ap); 761 762 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 763 } 764 765 void 766 ieee80211_note_frame(const struct ieee80211vap *vap, 767 const struct ieee80211_frame *wh, 768 const char *fmt, ...) 769 { 770 char buf[128]; /* XXX */ 771 __va_list ap; 772 773 __va_start(ap, fmt); 774 kvsnprintf(buf, sizeof(buf), fmt, ap); 775 __va_end(ap); 776 if_printf(vap->iv_ifp, "[%6D] %s\n", 777 ieee80211_getbssid(vap, wh), ":", 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; 787 788 __va_start(ap, fmt); 789 kvsnprintf(buf, sizeof(buf), fmt, ap); 790 __va_end(ap); 791 if_printf(vap->iv_ifp, "[%6D] %s\n", mac, ":", 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; 800 801 if_printf(vap->iv_ifp, "[%6D] discard ", 802 ieee80211_getbssid(vap, wh), ":"); 803 if (type == NULL) { 804 kprintf("%s frame, ", ieee80211_mgt_subtype_name[ 805 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 806 IEEE80211_FC0_SUBTYPE_SHIFT]); 807 } else 808 kprintf("%s frame, ", type); 809 __va_start(ap, fmt); 810 kvprintf(fmt, ap); 811 __va_end(ap); 812 kprintf("\n"); 813 } 814 815 void 816 ieee80211_discard_ie(const struct ieee80211vap *vap, 817 const struct ieee80211_frame *wh, 818 const char *type, const char *fmt, ...) 819 { 820 __va_list ap; 821 822 if_printf(vap->iv_ifp, "[%6D] discard ", 823 ieee80211_getbssid(vap, wh), ":"); 824 if (type != NULL) 825 kprintf("%s information element, ", type); 826 else 827 kprintf("information element, "); 828 __va_start(ap, fmt); 829 kvprintf(fmt, ap); 830 __va_end(ap); 831 kprintf("\n"); 832 } 833 834 void 835 ieee80211_discard_mac(const struct ieee80211vap *vap, 836 const uint8_t mac[IEEE80211_ADDR_LEN], 837 const char *type, const char *fmt, ...) 838 { 839 __va_list ap; 840 841 if_printf(vap->iv_ifp, "[%6D] discard ", mac, ":"); 842 if (type != NULL) 843 kprintf("%s frame, ", type); 844 else 845 kprintf("frame, "); 846 __va_start(ap, fmt); 847 kvprintf(fmt, ap); 848 __va_end(ap); 849 kprintf("\n"); 850 } 851 #endif /* IEEE80211_DEBUG */ 852