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 #ifdef IEEE80211_SUPPORT_MESH 50 #include <net80211/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, M_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 IEEE80211_NODE_LOCK(ni->ni_table); 149 mfrag = ni->ni_rxfrag[0]; 150 ni->ni_rxfrag[0] = NULL; 151 IEEE80211_NODE_UNLOCK(ni->ni_table); 152 153 /* 154 * Validate new fragment is in order and 155 * related to the previous ones. 156 */ 157 if (mfrag != NULL) { 158 uint16_t last_rxseq; 159 160 lwh = mtod(mfrag, struct ieee80211_frame *); 161 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 162 /* NB: check seq # and frag together */ 163 if (rxseq != last_rxseq+1 || 164 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || 165 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 166 /* 167 * Unrelated fragment or no space for it, 168 * clear current fragments. 169 */ 170 m_freem(mfrag); 171 mfrag = NULL; 172 } 173 } 174 175 if (mfrag == NULL) { 176 if (fragno != 0) { /* !first fragment, discard */ 177 vap->iv_stats.is_rx_defrag++; 178 IEEE80211_NODE_STAT(ni, rx_defrag); 179 m_freem(m); 180 return NULL; 181 } 182 mfrag = m; 183 } else { /* concatenate */ 184 m_adj(m, hdrspace); /* strip header */ 185 m_cat(mfrag, m); 186 /* NB: m_cat doesn't update the packet header */ 187 mfrag->m_pkthdr.len += m->m_pkthdr.len; 188 /* track last seqnum and fragno */ 189 lwh = mtod(mfrag, struct ieee80211_frame *); 190 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 191 } 192 if (more_frag) { /* more to come, save */ 193 ni->ni_rxfragstamp = ticks; 194 ni->ni_rxfrag[0] = mfrag; 195 mfrag = NULL; 196 } 197 return mfrag; 198 } 199 200 void 201 ieee80211_deliver_data(struct ieee80211vap *vap, 202 struct ieee80211_node *ni, struct mbuf *m) 203 { 204 struct ether_header *eh = mtod(m, struct ether_header *); 205 struct ifnet *ifp = vap->iv_ifp; 206 207 /* clear driver/net80211 flags before passing up */ 208 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST); 209 210 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 211 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 212 /* 213 * Do accounting. 214 */ 215 ifp->if_ipackets++; 216 IEEE80211_NODE_STAT(ni, rx_data); 217 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 218 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 219 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 220 IEEE80211_NODE_STAT(ni, rx_mcast); 221 } else 222 IEEE80211_NODE_STAT(ni, rx_ucast); 223 m->m_pkthdr.rcvif = ifp; 224 225 if (ni->ni_vlan != 0) { 226 /* attach vlan tag */ 227 m->m_pkthdr.ether_vtag = ni->ni_vlan; 228 m->m_flags |= M_VLANTAG; 229 } 230 ifp->if_input(ifp, m); 231 } 232 233 struct mbuf * 234 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 235 { 236 struct ieee80211_qosframe_addr4 wh; 237 struct ether_header *eh; 238 struct llc *llc; 239 240 KASSERT(hdrlen <= sizeof(wh), 241 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 242 243 if (m->m_len < hdrlen + sizeof(*llc) && 244 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 245 vap->iv_stats.is_rx_tooshort++; 246 /* XXX msg */ 247 return NULL; 248 } 249 memcpy(&wh, mtod(m, caddr_t), hdrlen); 250 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 251 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 252 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 253 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 254 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 255 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 256 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 257 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 258 llc = NULL; 259 } else { 260 m_adj(m, hdrlen - sizeof(*eh)); 261 } 262 eh = mtod(m, struct ether_header *); 263 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 264 case IEEE80211_FC1_DIR_NODS: 265 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 266 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 267 break; 268 case IEEE80211_FC1_DIR_TODS: 269 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 270 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 271 break; 272 case IEEE80211_FC1_DIR_FROMDS: 273 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 274 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 275 break; 276 case IEEE80211_FC1_DIR_DSTODS: 277 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 278 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 279 break; 280 } 281 #ifdef ALIGNED_POINTER 282 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 283 m = ieee80211_realign(vap, m, sizeof(*eh)); 284 if (m == NULL) 285 return NULL; 286 } 287 #endif /* ALIGNED_POINTER */ 288 if (llc != NULL) { 289 eh = mtod(m, struct ether_header *); 290 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 291 } 292 return m; 293 } 294 295 /* 296 * Decap a frame encapsulated in a fast-frame/A-MSDU. 297 */ 298 struct mbuf * 299 ieee80211_decap1(struct mbuf *m, int *framelen) 300 { 301 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 302 struct ether_header *eh; 303 struct llc *llc; 304 305 /* 306 * The frame has an 802.3 header followed by an 802.2 307 * LLC header. The encapsulated frame length is in the 308 * first header type field; save that and overwrite it 309 * with the true type field found in the second. Then 310 * copy the 802.3 header up to where it belongs and 311 * adjust the mbuf contents to remove the void. 312 */ 313 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 314 return NULL; 315 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 316 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 317 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 318 + sizeof(struct ether_header) - sizeof(struct llc); 319 eh->ether_type = llc->llc_un.type_snap.ether_type; 320 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 321 sizeof(struct ether_header)); 322 m_adj(m, sizeof(struct llc)); 323 return m; 324 #undef FF_LLC_SIZE 325 } 326 327 /* 328 * Install received rate set information in the node's state block. 329 */ 330 int 331 ieee80211_setup_rates(struct ieee80211_node *ni, 332 const uint8_t *rates, const uint8_t *xrates, int flags) 333 { 334 struct ieee80211vap *vap = ni->ni_vap; 335 struct ieee80211_rateset *rs = &ni->ni_rates; 336 337 memset(rs, 0, sizeof(*rs)); 338 rs->rs_nrates = rates[1]; 339 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 340 if (xrates != NULL) { 341 uint8_t nxrates; 342 /* 343 * Tack on 11g extended supported rate element. 344 */ 345 nxrates = xrates[1]; 346 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 347 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 348 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 349 "extended rate set too large; only using " 350 "%u of %u rates", nxrates, xrates[1]); 351 vap->iv_stats.is_rx_rstoobig++; 352 } 353 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 354 rs->rs_nrates += nxrates; 355 } 356 return ieee80211_fix_rate(ni, rs, flags); 357 } 358 359 /* 360 * Send a management frame error response to the specified 361 * station. If ni is associated with the station then use 362 * it; otherwise allocate a temporary node suitable for 363 * transmitting the frame and then free the reference so 364 * it will go away as soon as the frame has been transmitted. 365 */ 366 void 367 ieee80211_send_error(struct ieee80211_node *ni, 368 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 369 { 370 struct ieee80211vap *vap = ni->ni_vap; 371 int istmp; 372 373 if (ni == vap->iv_bss) { 374 if (vap->iv_state != IEEE80211_S_RUN) { 375 /* 376 * XXX hack until we get rid of this routine. 377 * We can be called prior to the vap reaching 378 * run state under certain conditions in which 379 * case iv_bss->ni_chan will not be setup. 380 * Check for this explicitly and and just ignore 381 * the request. 382 */ 383 return; 384 } 385 ni = ieee80211_tmp_node(vap, mac); 386 if (ni == NULL) { 387 /* XXX msg */ 388 return; 389 } 390 istmp = 1; 391 } else 392 istmp = 0; 393 IEEE80211_SEND_MGMT(ni, subtype, arg); 394 if (istmp) 395 ieee80211_free_node(ni); 396 } 397 398 int 399 ieee80211_alloc_challenge(struct ieee80211_node *ni) 400 { 401 if (ni->ni_challenge == NULL) 402 ni->ni_challenge = (uint32_t *) malloc(IEEE80211_CHALLENGE_LEN, 403 M_80211_NODE, M_NOWAIT); 404 if (ni->ni_challenge == NULL) { 405 IEEE80211_NOTE(ni->ni_vap, 406 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 407 "%s", "shared key challenge alloc failed"); 408 /* XXX statistic */ 409 } 410 return (ni->ni_challenge != NULL); 411 } 412 413 /* 414 * Parse a Beacon or ProbeResponse frame and return the 415 * useful information in an ieee80211_scanparams structure. 416 * Status is set to 0 if no problems were found; otherwise 417 * a bitmask of IEEE80211_BPARSE_* items is returned that 418 * describes the problems detected. 419 */ 420 int 421 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 422 struct ieee80211_scanparams *scan) 423 { 424 struct ieee80211vap *vap = ni->ni_vap; 425 struct ieee80211com *ic = ni->ni_ic; 426 struct ieee80211_frame *wh; 427 uint8_t *frm, *efrm; 428 429 wh = mtod(m, struct ieee80211_frame *); 430 frm = (uint8_t *)&wh[1]; 431 efrm = mtod(m, uint8_t *) + m->m_len; 432 scan->status = 0; 433 /* 434 * beacon/probe response frame format 435 * [8] time stamp 436 * [2] beacon interval 437 * [2] capability information 438 * [tlv] ssid 439 * [tlv] supported rates 440 * [tlv] country information 441 * [tlv] channel switch announcement (CSA) 442 * [tlv] parameter set (FH/DS) 443 * [tlv] erp information 444 * [tlv] extended supported rates 445 * [tlv] WME 446 * [tlv] WPA or RSN 447 * [tlv] HT capabilities 448 * [tlv] HT information 449 * [tlv] Atheros capabilities 450 * [tlv] Mesh ID 451 * [tlv] Mesh Configuration 452 */ 453 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 454 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 455 memset(scan, 0, sizeof(*scan)); 456 scan->tstamp = frm; frm += 8; 457 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 458 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 459 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 460 scan->chan = scan->bchan; 461 scan->ies = frm; 462 scan->ies_len = efrm - frm; 463 464 while (efrm - frm > 1) { 465 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 466 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 467 switch (*frm) { 468 case IEEE80211_ELEMID_SSID: 469 scan->ssid = frm; 470 break; 471 case IEEE80211_ELEMID_RATES: 472 scan->rates = frm; 473 break; 474 case IEEE80211_ELEMID_COUNTRY: 475 scan->country = frm; 476 break; 477 case IEEE80211_ELEMID_CSA: 478 scan->csa = frm; 479 break; 480 case IEEE80211_ELEMID_FHPARMS: 481 if (ic->ic_phytype == IEEE80211_T_FH) { 482 scan->fhdwell = LE_READ_2(&frm[2]); 483 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 484 scan->fhindex = frm[6]; 485 } 486 break; 487 case IEEE80211_ELEMID_DSPARMS: 488 /* 489 * XXX hack this since depending on phytype 490 * is problematic for multi-mode devices. 491 */ 492 if (ic->ic_phytype != IEEE80211_T_FH) 493 scan->chan = frm[2]; 494 break; 495 case IEEE80211_ELEMID_TIM: 496 /* XXX ATIM? */ 497 scan->tim = frm; 498 scan->timoff = frm - mtod(m, uint8_t *); 499 break; 500 case IEEE80211_ELEMID_IBSSPARMS: 501 case IEEE80211_ELEMID_CFPARMS: 502 case IEEE80211_ELEMID_PWRCNSTR: 503 /* NB: avoid debugging complaints */ 504 break; 505 case IEEE80211_ELEMID_XRATES: 506 scan->xrates = frm; 507 break; 508 case IEEE80211_ELEMID_ERP: 509 if (frm[1] != 1) { 510 IEEE80211_DISCARD_IE(vap, 511 IEEE80211_MSG_ELEMID, wh, "ERP", 512 "bad len %u", frm[1]); 513 vap->iv_stats.is_rx_elem_toobig++; 514 break; 515 } 516 scan->erp = frm[2] | 0x100; 517 break; 518 case IEEE80211_ELEMID_HTCAP: 519 scan->htcap = frm; 520 break; 521 case IEEE80211_ELEMID_RSN: 522 scan->rsn = frm; 523 break; 524 case IEEE80211_ELEMID_HTINFO: 525 scan->htinfo = frm; 526 break; 527 #ifdef IEEE80211_SUPPORT_MESH 528 case IEEE80211_ELEMID_MESHID: 529 scan->meshid = frm; 530 break; 531 case IEEE80211_ELEMID_MESHCONF: 532 scan->meshconf = frm; 533 break; 534 #endif 535 case IEEE80211_ELEMID_VENDOR: 536 if (iswpaoui(frm)) 537 scan->wpa = frm; 538 else if (iswmeparam(frm) || iswmeinfo(frm)) 539 scan->wme = frm; 540 #ifdef IEEE80211_SUPPORT_SUPERG 541 else if (isatherosoui(frm)) 542 scan->ath = frm; 543 #endif 544 #ifdef IEEE80211_SUPPORT_TDMA 545 else if (istdmaoui(frm)) 546 scan->tdma = frm; 547 #endif 548 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 549 /* 550 * Accept pre-draft HT ie's if the 551 * standard ones have not been seen. 552 */ 553 if (ishtcapoui(frm)) { 554 if (scan->htcap == NULL) 555 scan->htcap = frm; 556 } else if (ishtinfooui(frm)) { 557 if (scan->htinfo == NULL) 558 scan->htcap = frm; 559 } 560 } 561 break; 562 default: 563 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 564 wh, "unhandled", 565 "id %u, len %u", *frm, frm[1]); 566 vap->iv_stats.is_rx_elem_unknown++; 567 break; 568 } 569 frm += frm[1] + 2; 570 } 571 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 572 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 573 if (scan->rates != NULL && scan->xrates != NULL) { 574 /* 575 * NB: don't process XRATES if RATES is missing. This 576 * avoids a potential null ptr deref and should be ok 577 * as the return code will already note RATES is missing 578 * (so callers shouldn't otherwise process the frame). 579 */ 580 IEEE80211_VERIFY_ELEMENT(scan->xrates, 581 IEEE80211_RATE_MAXSIZE - scan->rates[1], 582 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 583 } 584 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 585 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 586 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 587 /* 588 * Frame was received on a channel different from the 589 * one indicated in the DS params element id; 590 * silently discard it. 591 * 592 * NB: this can happen due to signal leakage. 593 * But we should take it for FH phy because 594 * the rssi value should be correct even for 595 * different hop pattern in FH. 596 */ 597 IEEE80211_DISCARD(vap, 598 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 599 wh, NULL, "for off-channel %u", scan->chan); 600 vap->iv_stats.is_rx_chanmismatch++; 601 scan->status |= IEEE80211_BPARSE_OFFCHAN; 602 } 603 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 604 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 605 IEEE80211_DISCARD(vap, 606 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 607 wh, NULL, "bogus beacon interval", scan->bintval); 608 vap->iv_stats.is_rx_badbintval++; 609 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 610 } 611 if (scan->country != NULL) { 612 /* 613 * Validate we have at least enough data to extract 614 * the country code. Not sure if we should return an 615 * error instead of discarding the IE; consider this 616 * being lenient as we don't depend on the data for 617 * correct operation. 618 */ 619 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 620 scan->country = NULL); 621 } 622 if (scan->csa != NULL) { 623 /* 624 * Validate Channel Switch Announcement; this must 625 * be the correct length or we toss the frame. 626 */ 627 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 628 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 629 } 630 /* 631 * Process HT ie's. This is complicated by our 632 * accepting both the standard ie's and the pre-draft 633 * vendor OUI ie's that some vendors still use/require. 634 */ 635 if (scan->htcap != NULL) { 636 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 637 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 638 4 + sizeof(struct ieee80211_ie_htcap)-2 : 639 sizeof(struct ieee80211_ie_htcap)-2, 640 scan->htcap = NULL); 641 } 642 if (scan->htinfo != NULL) { 643 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 644 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 645 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 646 sizeof(struct ieee80211_ie_htinfo)-2, 647 scan->htinfo = NULL); 648 } 649 return scan->status; 650 } 651 652 /* 653 * Parse an Action frame. Return 0 on success, non-zero on failure. 654 */ 655 int 656 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 657 { 658 struct ieee80211vap *vap = ni->ni_vap; 659 const struct ieee80211_action *ia; 660 struct ieee80211_frame *wh; 661 uint8_t *frm, *efrm; 662 663 /* 664 * action frame format: 665 * [1] category 666 * [1] action 667 * [tlv] parameters 668 */ 669 wh = mtod(m, struct ieee80211_frame *); 670 frm = (u_int8_t *)&wh[1]; 671 efrm = mtod(m, u_int8_t *) + m->m_len; 672 IEEE80211_VERIFY_LENGTH(efrm - frm, 673 sizeof(struct ieee80211_action), return EINVAL); 674 ia = (const struct ieee80211_action *) frm; 675 676 vap->iv_stats.is_rx_action++; 677 IEEE80211_NODE_STAT(ni, rx_action); 678 679 /* verify frame payloads but defer processing */ 680 /* XXX maybe push this to method */ 681 switch (ia->ia_category) { 682 case IEEE80211_ACTION_CAT_BA: 683 switch (ia->ia_action) { 684 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 685 IEEE80211_VERIFY_LENGTH(efrm - frm, 686 sizeof(struct ieee80211_action_ba_addbarequest), 687 return EINVAL); 688 break; 689 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 690 IEEE80211_VERIFY_LENGTH(efrm - frm, 691 sizeof(struct ieee80211_action_ba_addbaresponse), 692 return EINVAL); 693 break; 694 case IEEE80211_ACTION_BA_DELBA: 695 IEEE80211_VERIFY_LENGTH(efrm - frm, 696 sizeof(struct ieee80211_action_ba_delba), 697 return EINVAL); 698 break; 699 } 700 break; 701 case IEEE80211_ACTION_CAT_HT: 702 switch (ia->ia_action) { 703 case IEEE80211_ACTION_HT_TXCHWIDTH: 704 IEEE80211_VERIFY_LENGTH(efrm - frm, 705 sizeof(struct ieee80211_action_ht_txchwidth), 706 return EINVAL); 707 break; 708 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 709 IEEE80211_VERIFY_LENGTH(efrm - frm, 710 sizeof(struct ieee80211_action_ht_mimopowersave), 711 return EINVAL); 712 break; 713 } 714 break; 715 } 716 return 0; 717 } 718 719 #ifdef IEEE80211_DEBUG 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 printf("[%s] discard %s frame, ssid mismatch: ", 728 ether_sprintf(mac), tag); 729 ieee80211_print_essid(ssid + 2, ssid[1]); 730 printf("\n"); 731 } 732 733 /* 734 * Return the bssid of a frame. 735 */ 736 static const uint8_t * 737 ieee80211_getbssid(const struct ieee80211vap *vap, 738 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 vsnprintf(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; 771 772 va_start(ap, fmt); 773 vsnprintf(buf, sizeof(buf), fmt, ap); 774 va_end(ap); 775 if_printf(vap->iv_ifp, "[%s] %s\n", 776 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 777 } 778 779 void 780 ieee80211_note_mac(const struct ieee80211vap *vap, 781 const uint8_t mac[IEEE80211_ADDR_LEN], 782 const char *fmt, ...) 783 { 784 char buf[128]; /* XXX */ 785 va_list ap; 786 787 va_start(ap, fmt); 788 vsnprintf(buf, sizeof(buf), fmt, ap); 789 va_end(ap); 790 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 791 } 792 793 void 794 ieee80211_discard_frame(const struct ieee80211vap *vap, 795 const struct ieee80211_frame *wh, 796 const char *type, const char *fmt, ...) 797 { 798 va_list ap; 799 800 if_printf(vap->iv_ifp, "[%s] discard ", 801 ether_sprintf(ieee80211_getbssid(vap, wh))); 802 if (type == NULL) { 803 printf("%s frame, ", ieee80211_mgt_subtype_name[ 804 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 805 IEEE80211_FC0_SUBTYPE_SHIFT]); 806 } else 807 printf("%s frame, ", type); 808 va_start(ap, fmt); 809 vprintf(fmt, ap); 810 va_end(ap); 811 printf("\n"); 812 } 813 814 void 815 ieee80211_discard_ie(const struct ieee80211vap *vap, 816 const struct ieee80211_frame *wh, 817 const char *type, const char *fmt, ...) 818 { 819 va_list ap; 820 821 if_printf(vap->iv_ifp, "[%s] discard ", 822 ether_sprintf(ieee80211_getbssid(vap, wh))); 823 if (type != NULL) 824 printf("%s information element, ", type); 825 else 826 printf("information element, "); 827 va_start(ap, fmt); 828 vprintf(fmt, ap); 829 va_end(ap); 830 printf("\n"); 831 } 832 833 void 834 ieee80211_discard_mac(const struct ieee80211vap *vap, 835 const uint8_t mac[IEEE80211_ADDR_LEN], 836 const char *type, const char *fmt, ...) 837 { 838 va_list ap; 839 840 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 841 if (type != NULL) 842 printf("%s frame, ", type); 843 else 844 printf("frame, "); 845 va_start(ap, fmt); 846 vprintf(fmt, ap); 847 va_end(ap); 848 printf("\n"); 849 } 850 #endif /* IEEE80211_DEBUG */ 851