1 /*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include "opt_wlan.h" 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/mbuf.h> 35 #include <sys/malloc.h> 36 #include <sys/endian.h> 37 #include <sys/kernel.h> 38 39 #include <sys/socket.h> 40 41 #include <net/ethernet.h> 42 #include <net/if.h> 43 #include <net/if_llc.h> 44 #include <net/if_media.h> 45 #include <net/if_vlan_var.h> 46 47 #include <net80211/ieee80211_var.h> 48 #include <net80211/ieee80211_input.h> 49 50 #include <net/bpf.h> 51 52 #ifdef INET 53 #include <netinet/in.h> 54 #include <net/ethernet.h> 55 #endif 56 57 int 58 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf) 59 { 60 struct ieee80211vap *vap; 61 int type = -1; 62 63 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */ 64 65 /* XXX locking */ 66 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 67 struct ieee80211_node *ni; 68 struct mbuf *mcopy; 69 70 /* NB: could check for IFF_UP but this is cheaper */ 71 if (vap->iv_state == IEEE80211_S_INIT) 72 continue; 73 /* 74 * WDS vap's only receive directed traffic from the 75 * station at the ``far end''. That traffic should 76 * be passed through the AP vap the station is associated 77 * to--so don't spam them with mcast frames. 78 */ 79 if (vap->iv_opmode == IEEE80211_M_WDS) 80 continue; 81 if (TAILQ_NEXT(vap, iv_next) != NULL) { 82 /* 83 * Packet contents are changed by ieee80211_decap 84 * so do a deep copy of the packet. 85 */ 86 mcopy = m_dup(m, M_DONTWAIT); 87 if (mcopy == NULL) { 88 /* XXX stat+msg */ 89 continue; 90 } 91 } else { 92 mcopy = m; 93 m = NULL; 94 } 95 ni = ieee80211_ref_node(vap->iv_bss); 96 type = ieee80211_input(ni, mcopy, rssi, nf); 97 ieee80211_free_node(ni); 98 } 99 if (m != NULL) /* no vaps, reclaim mbuf */ 100 m_freem(m); 101 return type; 102 } 103 104 /* 105 * This function reassembles fragments. 106 * 107 * XXX should handle 3 concurrent reassemblies per-spec. 108 */ 109 struct mbuf * 110 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace) 111 { 112 struct ieee80211vap *vap = ni->ni_vap; 113 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 114 struct ieee80211_frame *lwh; 115 uint16_t rxseq; 116 uint8_t fragno; 117 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 118 struct mbuf *mfrag; 119 120 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 121 122 rxseq = le16toh(*(uint16_t *)wh->i_seq); 123 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 124 125 /* Quick way out, if there's nothing to defragment */ 126 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 127 return m; 128 129 /* 130 * Remove frag to insure it doesn't get reaped by timer. 131 */ 132 if (ni->ni_table == NULL) { 133 /* 134 * Should never happen. If the node is orphaned (not in 135 * the table) then input packets should not reach here. 136 * Otherwise, a concurrent request that yanks the table 137 * should be blocked by other interlocking and/or by first 138 * shutting the driver down. Regardless, be defensive 139 * here and just bail 140 */ 141 /* XXX need msg+stat */ 142 m_freem(m); 143 return NULL; 144 } 145 IEEE80211_NODE_LOCK(ni->ni_table); 146 mfrag = ni->ni_rxfrag[0]; 147 ni->ni_rxfrag[0] = NULL; 148 IEEE80211_NODE_UNLOCK(ni->ni_table); 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 ifp->if_ipackets++; 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_vtag = 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; /* Max size address frames */ 234 struct ether_header *eh; 235 struct llc *llc; 236 237 if (m->m_len < hdrlen + sizeof(*llc) && 238 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 239 /* XXX stat, msg */ 240 return NULL; 241 } 242 memcpy(&wh, mtod(m, caddr_t), hdrlen); 243 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 244 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 245 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 246 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 247 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 248 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 249 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 250 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 251 llc = NULL; 252 } else { 253 m_adj(m, hdrlen - sizeof(*eh)); 254 } 255 eh = mtod(m, struct ether_header *); 256 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 257 case IEEE80211_FC1_DIR_NODS: 258 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 259 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 260 break; 261 case IEEE80211_FC1_DIR_TODS: 262 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 263 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 264 break; 265 case IEEE80211_FC1_DIR_FROMDS: 266 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 267 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 268 break; 269 case IEEE80211_FC1_DIR_DSTODS: 270 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 271 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 272 break; 273 } 274 #ifdef ALIGNED_POINTER 275 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 276 struct mbuf *n, *n0, **np; 277 caddr_t newdata; 278 int off, pktlen; 279 280 n0 = NULL; 281 np = &n0; 282 off = 0; 283 pktlen = m->m_pkthdr.len; 284 while (pktlen > off) { 285 if (n0 == NULL) { 286 MGETHDR(n, M_DONTWAIT, MT_DATA); 287 if (n == NULL) { 288 m_freem(m); 289 return NULL; 290 } 291 M_MOVE_PKTHDR(n, m); 292 n->m_len = MHLEN; 293 } else { 294 MGET(n, M_DONTWAIT, MT_DATA); 295 if (n == NULL) { 296 m_freem(m); 297 m_freem(n0); 298 return NULL; 299 } 300 n->m_len = MLEN; 301 } 302 if (pktlen - off >= MINCLSIZE) { 303 MCLGET(n, M_DONTWAIT); 304 if (n->m_flags & M_EXT) 305 n->m_len = n->m_ext.ext_size; 306 } 307 if (n0 == NULL) { 308 newdata = 309 (caddr_t)ALIGN(n->m_data + sizeof(*eh)) - 310 sizeof(*eh); 311 n->m_len -= newdata - n->m_data; 312 n->m_data = newdata; 313 } 314 if (n->m_len > pktlen - off) 315 n->m_len = pktlen - off; 316 m_copydata(m, off, n->m_len, mtod(n, caddr_t)); 317 off += n->m_len; 318 *np = n; 319 np = &n->m_next; 320 } 321 m_freem(m); 322 m = n0; 323 } 324 #endif /* ALIGNED_POINTER */ 325 if (llc != NULL) { 326 eh = mtod(m, struct ether_header *); 327 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 328 } 329 return m; 330 } 331 332 /* 333 * Decap a frame encapsulated in a fast-frame/A-MSDU. 334 */ 335 struct mbuf * 336 ieee80211_decap1(struct mbuf *m, int *framelen) 337 { 338 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 339 struct ether_header *eh; 340 struct llc *llc; 341 342 /* 343 * The frame has an 802.3 header followed by an 802.2 344 * LLC header. The encapsulated frame length is in the 345 * first header type field; save that and overwrite it 346 * with the true type field found in the second. Then 347 * copy the 802.3 header up to where it belongs and 348 * adjust the mbuf contents to remove the void. 349 */ 350 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 351 return NULL; 352 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 353 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 354 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 355 + sizeof(struct ether_header) - sizeof(struct llc); 356 eh->ether_type = llc->llc_un.type_snap.ether_type; 357 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 358 sizeof(struct ether_header)); 359 m_adj(m, sizeof(struct llc)); 360 return m; 361 #undef FF_LLC_SIZE 362 } 363 364 /* 365 * Install received rate set information in the node's state block. 366 */ 367 int 368 ieee80211_setup_rates(struct ieee80211_node *ni, 369 const uint8_t *rates, const uint8_t *xrates, int flags) 370 { 371 struct ieee80211vap *vap = ni->ni_vap; 372 struct ieee80211_rateset *rs = &ni->ni_rates; 373 374 memset(rs, 0, sizeof(*rs)); 375 rs->rs_nrates = rates[1]; 376 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 377 if (xrates != NULL) { 378 uint8_t nxrates; 379 /* 380 * Tack on 11g extended supported rate element. 381 */ 382 nxrates = xrates[1]; 383 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 384 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 385 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 386 "extended rate set too large; only using " 387 "%u of %u rates", nxrates, xrates[1]); 388 vap->iv_stats.is_rx_rstoobig++; 389 } 390 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 391 rs->rs_nrates += nxrates; 392 } 393 return ieee80211_fix_rate(ni, rs, flags); 394 } 395 396 /* 397 * Send a management frame error response to the specified 398 * station. If ni is associated with the station then use 399 * it; otherwise allocate a temporary node suitable for 400 * transmitting the frame and then free the reference so 401 * it will go away as soon as the frame has been transmitted. 402 */ 403 void 404 ieee80211_send_error(struct ieee80211_node *ni, 405 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 406 { 407 struct ieee80211vap *vap = ni->ni_vap; 408 int istmp; 409 410 if (ni == vap->iv_bss) { 411 if (vap->iv_state != IEEE80211_S_RUN) { 412 /* 413 * XXX hack until we get rid of this routine. 414 * We can be called prior to the vap reaching 415 * run state under certain conditions in which 416 * case iv_bss->ni_chan will not be setup. 417 * Check for this explicitly and and just ignore 418 * the request. 419 */ 420 return; 421 } 422 ni = ieee80211_tmp_node(vap, mac); 423 if (ni == NULL) { 424 /* XXX msg */ 425 return; 426 } 427 istmp = 1; 428 } else 429 istmp = 0; 430 IEEE80211_SEND_MGMT(ni, subtype, arg); 431 if (istmp) 432 ieee80211_free_node(ni); 433 } 434 435 int 436 ieee80211_alloc_challenge(struct ieee80211_node *ni) 437 { 438 if (ni->ni_challenge == NULL) 439 ni->ni_challenge = (uint32_t *) malloc(IEEE80211_CHALLENGE_LEN, 440 M_80211_NODE, M_NOWAIT); 441 if (ni->ni_challenge == NULL) { 442 IEEE80211_NOTE(ni->ni_vap, 443 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 444 "%s", "shared key challenge alloc failed"); 445 /* XXX statistic */ 446 } 447 return (ni->ni_challenge != NULL); 448 } 449 450 /* 451 * Parse a Beacon or ProbeResponse frame and return the 452 * useful information in an ieee80211_scanparams structure. 453 * Status is set to 0 if no problems were found; otherwise 454 * a bitmask of IEEE80211_BPARSE_* items is returned that 455 * describes the problems detected. 456 */ 457 int 458 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 459 struct ieee80211_scanparams *scan) 460 { 461 struct ieee80211vap *vap = ni->ni_vap; 462 struct ieee80211com *ic = ni->ni_ic; 463 struct ieee80211_frame *wh; 464 uint8_t *frm, *efrm; 465 466 wh = mtod(m, struct ieee80211_frame *); 467 frm = (uint8_t *)&wh[1]; 468 efrm = mtod(m, uint8_t *) + m->m_len; 469 scan->status = 0; 470 /* 471 * beacon/probe response frame format 472 * [8] time stamp 473 * [2] beacon interval 474 * [2] capability information 475 * [tlv] ssid 476 * [tlv] supported rates 477 * [tlv] country information 478 * [tlv] channel switch announcement (CSA) 479 * [tlv] parameter set (FH/DS) 480 * [tlv] erp information 481 * [tlv] extended supported rates 482 * [tlv] WME 483 * [tlv] WPA or RSN 484 * [tlv] HT capabilities 485 * [tlv] HT information 486 * [tlv] Atheros capabilities 487 */ 488 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 489 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 490 memset(scan, 0, sizeof(*scan)); 491 scan->tstamp = frm; frm += 8; 492 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 493 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 494 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 495 scan->chan = scan->bchan; 496 scan->ies = frm; 497 scan->ies_len = efrm - frm; 498 499 while (efrm - frm > 1) { 500 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 501 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 502 switch (*frm) { 503 case IEEE80211_ELEMID_SSID: 504 scan->ssid = frm; 505 break; 506 case IEEE80211_ELEMID_RATES: 507 scan->rates = frm; 508 break; 509 case IEEE80211_ELEMID_COUNTRY: 510 scan->country = frm; 511 break; 512 case IEEE80211_ELEMID_CSA: 513 scan->csa = frm; 514 break; 515 case IEEE80211_ELEMID_FHPARMS: 516 if (ic->ic_phytype == IEEE80211_T_FH) { 517 scan->fhdwell = LE_READ_2(&frm[2]); 518 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 519 scan->fhindex = frm[6]; 520 } 521 break; 522 case IEEE80211_ELEMID_DSPARMS: 523 /* 524 * XXX hack this since depending on phytype 525 * is problematic for multi-mode devices. 526 */ 527 if (ic->ic_phytype != IEEE80211_T_FH) 528 scan->chan = frm[2]; 529 break; 530 case IEEE80211_ELEMID_TIM: 531 /* XXX ATIM? */ 532 scan->tim = frm; 533 scan->timoff = frm - mtod(m, uint8_t *); 534 break; 535 case IEEE80211_ELEMID_IBSSPARMS: 536 case IEEE80211_ELEMID_CFPARMS: 537 case IEEE80211_ELEMID_PWRCNSTR: 538 /* NB: avoid debugging complaints */ 539 break; 540 case IEEE80211_ELEMID_XRATES: 541 scan->xrates = frm; 542 break; 543 case IEEE80211_ELEMID_ERP: 544 if (frm[1] != 1) { 545 IEEE80211_DISCARD_IE(vap, 546 IEEE80211_MSG_ELEMID, wh, "ERP", 547 "bad len %u", frm[1]); 548 vap->iv_stats.is_rx_elem_toobig++; 549 break; 550 } 551 scan->erp = frm[2] | 0x100; 552 break; 553 case IEEE80211_ELEMID_HTCAP: 554 scan->htcap = frm; 555 break; 556 case IEEE80211_ELEMID_RSN: 557 scan->rsn = frm; 558 break; 559 case IEEE80211_ELEMID_HTINFO: 560 scan->htinfo = frm; 561 break; 562 case IEEE80211_ELEMID_VENDOR: 563 if (iswpaoui(frm)) 564 scan->wpa = frm; 565 else if (iswmeparam(frm) || iswmeinfo(frm)) 566 scan->wme = frm; 567 #ifdef IEEE80211_SUPPORT_SUPERG 568 else if (isatherosoui(frm)) 569 scan->ath = frm; 570 #endif 571 #ifdef IEEE80211_SUPPORT_TDMA 572 else if (istdmaoui(frm)) 573 scan->tdma = frm; 574 #endif 575 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 576 /* 577 * Accept pre-draft HT ie's if the 578 * standard ones have not been seen. 579 */ 580 if (ishtcapoui(frm)) { 581 if (scan->htcap == NULL) 582 scan->htcap = frm; 583 } else if (ishtinfooui(frm)) { 584 if (scan->htinfo == NULL) 585 scan->htcap = frm; 586 } 587 } 588 break; 589 default: 590 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 591 wh, "unhandled", 592 "id %u, len %u", *frm, frm[1]); 593 vap->iv_stats.is_rx_elem_unknown++; 594 break; 595 } 596 frm += frm[1] + 2; 597 } 598 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 599 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 600 if (scan->rates != NULL && scan->xrates != NULL) { 601 /* 602 * NB: don't process XRATES if RATES is missing. This 603 * avoids a potential null ptr deref and should be ok 604 * as the return code will already note RATES is missing 605 * (so callers shouldn't otherwise process the frame). 606 */ 607 IEEE80211_VERIFY_ELEMENT(scan->xrates, 608 IEEE80211_RATE_MAXSIZE - scan->rates[1], 609 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 610 } 611 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 612 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 613 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 614 /* 615 * Frame was received on a channel different from the 616 * one indicated in the DS params element id; 617 * silently discard it. 618 * 619 * NB: this can happen due to signal leakage. 620 * But we should take it for FH phy because 621 * the rssi value should be correct even for 622 * different hop pattern in FH. 623 */ 624 IEEE80211_DISCARD(vap, 625 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 626 wh, NULL, "for off-channel %u", scan->chan); 627 vap->iv_stats.is_rx_chanmismatch++; 628 scan->status |= IEEE80211_BPARSE_OFFCHAN; 629 } 630 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 631 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 632 IEEE80211_DISCARD(vap, 633 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 634 wh, NULL, "bogus beacon interval", scan->bintval); 635 vap->iv_stats.is_rx_badbintval++; 636 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 637 } 638 if (scan->country != NULL) { 639 /* 640 * Validate we have at least enough data to extract 641 * the country code. Not sure if we should return an 642 * error instead of discarding the IE; consider this 643 * being lenient as we don't depend on the data for 644 * correct operation. 645 */ 646 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 647 scan->country = NULL); 648 } 649 if (scan->csa != NULL) { 650 /* 651 * Validate Channel Switch Announcement; this must 652 * be the correct length or we toss the frame. 653 */ 654 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 655 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 656 } 657 /* 658 * Process HT ie's. This is complicated by our 659 * accepting both the standard ie's and the pre-draft 660 * vendor OUI ie's that some vendors still use/require. 661 */ 662 if (scan->htcap != NULL) { 663 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 664 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 665 4 + sizeof(struct ieee80211_ie_htcap)-2 : 666 sizeof(struct ieee80211_ie_htcap)-2, 667 scan->htcap = NULL); 668 } 669 if (scan->htinfo != NULL) { 670 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 671 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 672 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 673 sizeof(struct ieee80211_ie_htinfo)-2, 674 scan->htinfo = NULL); 675 } 676 return scan->status; 677 } 678 679 /* 680 * Parse an Action frame. Return 0 on success, non-zero on failure. 681 */ 682 int 683 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 684 { 685 struct ieee80211vap *vap = ni->ni_vap; 686 const struct ieee80211_action *ia; 687 struct ieee80211_frame *wh; 688 uint8_t *frm, *efrm; 689 690 /* 691 * action frame format: 692 * [1] category 693 * [1] action 694 * [tlv] parameters 695 */ 696 wh = mtod(m, struct ieee80211_frame *); 697 frm = (u_int8_t *)&wh[1]; 698 efrm = mtod(m, u_int8_t *) + m->m_len; 699 IEEE80211_VERIFY_LENGTH(efrm - frm, 700 sizeof(struct ieee80211_action), return EINVAL); 701 ia = (const struct ieee80211_action *) frm; 702 703 vap->iv_stats.is_rx_action++; 704 IEEE80211_NODE_STAT(ni, rx_action); 705 706 /* verify frame payloads but defer processing */ 707 /* XXX maybe push this to method */ 708 switch (ia->ia_category) { 709 case IEEE80211_ACTION_CAT_BA: 710 switch (ia->ia_action) { 711 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 712 IEEE80211_VERIFY_LENGTH(efrm - frm, 713 sizeof(struct ieee80211_action_ba_addbarequest), 714 return EINVAL); 715 break; 716 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 717 IEEE80211_VERIFY_LENGTH(efrm - frm, 718 sizeof(struct ieee80211_action_ba_addbaresponse), 719 return EINVAL); 720 break; 721 case IEEE80211_ACTION_BA_DELBA: 722 IEEE80211_VERIFY_LENGTH(efrm - frm, 723 sizeof(struct ieee80211_action_ba_delba), 724 return EINVAL); 725 break; 726 } 727 break; 728 case IEEE80211_ACTION_CAT_HT: 729 switch (ia->ia_action) { 730 case IEEE80211_ACTION_HT_TXCHWIDTH: 731 IEEE80211_VERIFY_LENGTH(efrm - frm, 732 sizeof(struct ieee80211_action_ht_txchwidth), 733 return EINVAL); 734 break; 735 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 736 IEEE80211_VERIFY_LENGTH(efrm - frm, 737 sizeof(struct ieee80211_action_ht_mimopowersave), 738 return EINVAL); 739 break; 740 } 741 break; 742 } 743 return 0; 744 } 745 746 #ifdef IEEE80211_DEBUG 747 /* 748 * Debugging support. 749 */ 750 void 751 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 752 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 753 { 754 printf("[%s] discard %s frame, ssid mismatch: ", 755 ether_sprintf(mac), tag); 756 ieee80211_print_essid(ssid + 2, ssid[1]); 757 printf("\n"); 758 } 759 760 /* 761 * Return the bssid of a frame. 762 */ 763 static const uint8_t * 764 ieee80211_getbssid(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 765 { 766 if (vap->iv_opmode == IEEE80211_M_STA) 767 return wh->i_addr2; 768 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 769 return wh->i_addr1; 770 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 771 return wh->i_addr1; 772 return wh->i_addr3; 773 } 774 775 #include <machine/stdarg.h> 776 777 void 778 ieee80211_note(struct ieee80211vap *vap, const char *fmt, ...) 779 { 780 char buf[128]; /* XXX */ 781 va_list ap; 782 783 va_start(ap, fmt); 784 vsnprintf(buf, sizeof(buf), fmt, ap); 785 va_end(ap); 786 787 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 788 } 789 790 void 791 ieee80211_note_frame(struct ieee80211vap *vap, 792 const struct ieee80211_frame *wh, 793 const char *fmt, ...) 794 { 795 char buf[128]; /* XXX */ 796 va_list ap; 797 798 va_start(ap, fmt); 799 vsnprintf(buf, sizeof(buf), fmt, ap); 800 va_end(ap); 801 if_printf(vap->iv_ifp, "[%s] %s\n", 802 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 803 } 804 805 void 806 ieee80211_note_mac(struct ieee80211vap *vap, 807 const uint8_t mac[IEEE80211_ADDR_LEN], 808 const char *fmt, ...) 809 { 810 char buf[128]; /* XXX */ 811 va_list ap; 812 813 va_start(ap, fmt); 814 vsnprintf(buf, sizeof(buf), fmt, ap); 815 va_end(ap); 816 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 817 } 818 819 void 820 ieee80211_discard_frame(struct ieee80211vap *vap, 821 const struct ieee80211_frame *wh, 822 const char *type, const char *fmt, ...) 823 { 824 va_list ap; 825 826 if_printf(vap->iv_ifp, "[%s] discard ", 827 ether_sprintf(ieee80211_getbssid(vap, wh))); 828 if (type == NULL) { 829 printf("%s frame, ", ieee80211_mgt_subtype_name[ 830 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 831 IEEE80211_FC0_SUBTYPE_SHIFT]); 832 } else 833 printf("%s frame, ", type); 834 va_start(ap, fmt); 835 vprintf(fmt, ap); 836 va_end(ap); 837 printf("\n"); 838 } 839 840 void 841 ieee80211_discard_ie(struct ieee80211vap *vap, 842 const struct ieee80211_frame *wh, 843 const char *type, const char *fmt, ...) 844 { 845 va_list ap; 846 847 if_printf(vap->iv_ifp, "[%s] discard ", 848 ether_sprintf(ieee80211_getbssid(vap, wh))); 849 if (type != NULL) 850 printf("%s information element, ", type); 851 else 852 printf("information element, "); 853 va_start(ap, fmt); 854 vprintf(fmt, ap); 855 va_end(ap); 856 printf("\n"); 857 } 858 859 void 860 ieee80211_discard_mac(struct ieee80211vap *vap, 861 const uint8_t mac[IEEE80211_ADDR_LEN], 862 const char *type, const char *fmt, ...) 863 { 864 va_list ap; 865 866 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 867 if (type != NULL) 868 printf("%s frame, ", type); 869 else 870 printf("frame, "); 871 va_start(ap, fmt); 872 vprintf(fmt, ap); 873 va_end(ap); 874 printf("\n"); 875 } 876 #endif /* IEEE80211_DEBUG */ 877