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 #ifdef IEEE80211_SUPPORT_MESH 237 union { 238 struct ieee80211_qosframe_addr4 wh4; 239 uint8_t b[sizeof(struct ieee80211_qosframe_addr4) + 240 sizeof(struct ieee80211_meshcntl_ae11)]; 241 } whu; 242 #define wh whu.wh4 243 #else 244 struct ieee80211_qosframe_addr4 wh; 245 #endif 246 struct ether_header *eh; 247 struct llc *llc; 248 249 if (m->m_len < hdrlen + sizeof(*llc) && 250 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 251 /* XXX stat, msg */ 252 return NULL; 253 } 254 memcpy(&wh, mtod(m, caddr_t), hdrlen); 255 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 256 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 257 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 258 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 259 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 260 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 261 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 262 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 263 llc = NULL; 264 } else { 265 m_adj(m, hdrlen - sizeof(*eh)); 266 } 267 eh = mtod(m, struct ether_header *); 268 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 269 case IEEE80211_FC1_DIR_NODS: 270 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 271 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 272 break; 273 case IEEE80211_FC1_DIR_TODS: 274 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 275 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 276 break; 277 case IEEE80211_FC1_DIR_FROMDS: 278 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 279 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 280 break; 281 case IEEE80211_FC1_DIR_DSTODS: 282 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 283 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 284 break; 285 } 286 #ifdef ALIGNED_POINTER 287 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 288 struct mbuf *n, *n0, **np; 289 caddr_t newdata; 290 int off, pktlen; 291 292 n0 = NULL; 293 np = &n0; 294 off = 0; 295 pktlen = m->m_pkthdr.len; 296 while (pktlen > off) { 297 if (n0 == NULL) { 298 MGETHDR(n, M_DONTWAIT, MT_DATA); 299 if (n == NULL) { 300 m_freem(m); 301 return NULL; 302 } 303 M_MOVE_PKTHDR(n, m); 304 n->m_len = MHLEN; 305 } else { 306 MGET(n, M_DONTWAIT, MT_DATA); 307 if (n == NULL) { 308 m_freem(m); 309 m_freem(n0); 310 return NULL; 311 } 312 n->m_len = MLEN; 313 } 314 if (pktlen - off >= MINCLSIZE) { 315 MCLGET(n, M_DONTWAIT); 316 if (n->m_flags & M_EXT) 317 n->m_len = n->m_ext.ext_size; 318 } 319 if (n0 == NULL) { 320 newdata = 321 (caddr_t)ALIGN(n->m_data + sizeof(*eh)) - 322 sizeof(*eh); 323 n->m_len -= newdata - n->m_data; 324 n->m_data = newdata; 325 } 326 if (n->m_len > pktlen - off) 327 n->m_len = pktlen - off; 328 m_copydata(m, off, n->m_len, mtod(n, caddr_t)); 329 off += n->m_len; 330 *np = n; 331 np = &n->m_next; 332 } 333 m_freem(m); 334 m = n0; 335 } 336 #endif /* ALIGNED_POINTER */ 337 if (llc != NULL) { 338 eh = mtod(m, struct ether_header *); 339 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 340 } 341 return m; 342 #undef wh 343 } 344 345 /* 346 * Decap a frame encapsulated in a fast-frame/A-MSDU. 347 */ 348 struct mbuf * 349 ieee80211_decap1(struct mbuf *m, int *framelen) 350 { 351 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 352 struct ether_header *eh; 353 struct llc *llc; 354 355 /* 356 * The frame has an 802.3 header followed by an 802.2 357 * LLC header. The encapsulated frame length is in the 358 * first header type field; save that and overwrite it 359 * with the true type field found in the second. Then 360 * copy the 802.3 header up to where it belongs and 361 * adjust the mbuf contents to remove the void. 362 */ 363 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 364 return NULL; 365 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 366 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 367 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 368 + sizeof(struct ether_header) - sizeof(struct llc); 369 eh->ether_type = llc->llc_un.type_snap.ether_type; 370 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 371 sizeof(struct ether_header)); 372 m_adj(m, sizeof(struct llc)); 373 return m; 374 #undef FF_LLC_SIZE 375 } 376 377 /* 378 * Install received rate set information in the node's state block. 379 */ 380 int 381 ieee80211_setup_rates(struct ieee80211_node *ni, 382 const uint8_t *rates, const uint8_t *xrates, int flags) 383 { 384 struct ieee80211vap *vap = ni->ni_vap; 385 struct ieee80211_rateset *rs = &ni->ni_rates; 386 387 memset(rs, 0, sizeof(*rs)); 388 rs->rs_nrates = rates[1]; 389 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 390 if (xrates != NULL) { 391 uint8_t nxrates; 392 /* 393 * Tack on 11g extended supported rate element. 394 */ 395 nxrates = xrates[1]; 396 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 397 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 398 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 399 "extended rate set too large; only using " 400 "%u of %u rates", nxrates, xrates[1]); 401 vap->iv_stats.is_rx_rstoobig++; 402 } 403 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 404 rs->rs_nrates += nxrates; 405 } 406 return ieee80211_fix_rate(ni, rs, flags); 407 } 408 409 /* 410 * Send a management frame error response to the specified 411 * station. If ni is associated with the station then use 412 * it; otherwise allocate a temporary node suitable for 413 * transmitting the frame and then free the reference so 414 * it will go away as soon as the frame has been transmitted. 415 */ 416 void 417 ieee80211_send_error(struct ieee80211_node *ni, 418 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 419 { 420 struct ieee80211vap *vap = ni->ni_vap; 421 int istmp; 422 423 if (ni == vap->iv_bss) { 424 if (vap->iv_state != IEEE80211_S_RUN) { 425 /* 426 * XXX hack until we get rid of this routine. 427 * We can be called prior to the vap reaching 428 * run state under certain conditions in which 429 * case iv_bss->ni_chan will not be setup. 430 * Check for this explicitly and and just ignore 431 * the request. 432 */ 433 return; 434 } 435 ni = ieee80211_tmp_node(vap, mac); 436 if (ni == NULL) { 437 /* XXX msg */ 438 return; 439 } 440 istmp = 1; 441 } else 442 istmp = 0; 443 IEEE80211_SEND_MGMT(ni, subtype, arg); 444 if (istmp) 445 ieee80211_free_node(ni); 446 } 447 448 int 449 ieee80211_alloc_challenge(struct ieee80211_node *ni) 450 { 451 if (ni->ni_challenge == NULL) 452 ni->ni_challenge = (uint32_t *) malloc(IEEE80211_CHALLENGE_LEN, 453 M_80211_NODE, M_NOWAIT); 454 if (ni->ni_challenge == NULL) { 455 IEEE80211_NOTE(ni->ni_vap, 456 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 457 "%s", "shared key challenge alloc failed"); 458 /* XXX statistic */ 459 } 460 return (ni->ni_challenge != NULL); 461 } 462 463 /* 464 * Parse a Beacon or ProbeResponse frame and return the 465 * useful information in an ieee80211_scanparams structure. 466 * Status is set to 0 if no problems were found; otherwise 467 * a bitmask of IEEE80211_BPARSE_* items is returned that 468 * describes the problems detected. 469 */ 470 int 471 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 472 struct ieee80211_scanparams *scan) 473 { 474 struct ieee80211vap *vap = ni->ni_vap; 475 struct ieee80211com *ic = ni->ni_ic; 476 struct ieee80211_frame *wh; 477 uint8_t *frm, *efrm; 478 479 wh = mtod(m, struct ieee80211_frame *); 480 frm = (uint8_t *)&wh[1]; 481 efrm = mtod(m, uint8_t *) + m->m_len; 482 scan->status = 0; 483 /* 484 * beacon/probe response frame format 485 * [8] time stamp 486 * [2] beacon interval 487 * [2] capability information 488 * [tlv] ssid 489 * [tlv] supported rates 490 * [tlv] country information 491 * [tlv] channel switch announcement (CSA) 492 * [tlv] parameter set (FH/DS) 493 * [tlv] erp information 494 * [tlv] extended supported rates 495 * [tlv] WME 496 * [tlv] WPA or RSN 497 * [tlv] HT capabilities 498 * [tlv] HT information 499 * [tlv] Atheros capabilities 500 * [tlv] Mesh ID 501 * [tlv] Mesh Configuration 502 */ 503 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 504 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 505 memset(scan, 0, sizeof(*scan)); 506 scan->tstamp = frm; frm += 8; 507 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 508 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 509 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 510 scan->chan = scan->bchan; 511 scan->ies = frm; 512 scan->ies_len = efrm - frm; 513 514 while (efrm - frm > 1) { 515 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 516 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 517 switch (*frm) { 518 case IEEE80211_ELEMID_SSID: 519 scan->ssid = frm; 520 break; 521 case IEEE80211_ELEMID_RATES: 522 scan->rates = frm; 523 break; 524 case IEEE80211_ELEMID_COUNTRY: 525 scan->country = frm; 526 break; 527 case IEEE80211_ELEMID_CSA: 528 scan->csa = frm; 529 break; 530 case IEEE80211_ELEMID_FHPARMS: 531 if (ic->ic_phytype == IEEE80211_T_FH) { 532 scan->fhdwell = LE_READ_2(&frm[2]); 533 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 534 scan->fhindex = frm[6]; 535 } 536 break; 537 case IEEE80211_ELEMID_DSPARMS: 538 /* 539 * XXX hack this since depending on phytype 540 * is problematic for multi-mode devices. 541 */ 542 if (ic->ic_phytype != IEEE80211_T_FH) 543 scan->chan = frm[2]; 544 break; 545 case IEEE80211_ELEMID_TIM: 546 /* XXX ATIM? */ 547 scan->tim = frm; 548 scan->timoff = frm - mtod(m, uint8_t *); 549 break; 550 case IEEE80211_ELEMID_IBSSPARMS: 551 case IEEE80211_ELEMID_CFPARMS: 552 case IEEE80211_ELEMID_PWRCNSTR: 553 /* NB: avoid debugging complaints */ 554 break; 555 case IEEE80211_ELEMID_XRATES: 556 scan->xrates = frm; 557 break; 558 case IEEE80211_ELEMID_ERP: 559 if (frm[1] != 1) { 560 IEEE80211_DISCARD_IE(vap, 561 IEEE80211_MSG_ELEMID, wh, "ERP", 562 "bad len %u", frm[1]); 563 vap->iv_stats.is_rx_elem_toobig++; 564 break; 565 } 566 scan->erp = frm[2] | 0x100; 567 break; 568 case IEEE80211_ELEMID_HTCAP: 569 scan->htcap = frm; 570 break; 571 case IEEE80211_ELEMID_RSN: 572 scan->rsn = frm; 573 break; 574 case IEEE80211_ELEMID_HTINFO: 575 scan->htinfo = frm; 576 break; 577 #ifdef IEEE80211_SUPPORT_TDMA 578 case IEEE80211_ELEMID_MESHID: 579 scan->meshid = frm; 580 break; 581 case IEEE80211_ELEMID_MESHCONF: 582 scan->meshconf = frm; 583 break; 584 #endif 585 case IEEE80211_ELEMID_VENDOR: 586 if (iswpaoui(frm)) 587 scan->wpa = frm; 588 else if (iswmeparam(frm) || iswmeinfo(frm)) 589 scan->wme = frm; 590 #ifdef IEEE80211_SUPPORT_SUPERG 591 else if (isatherosoui(frm)) 592 scan->ath = frm; 593 #endif 594 #ifdef IEEE80211_SUPPORT_TDMA 595 else if (istdmaoui(frm)) 596 scan->tdma = frm; 597 #endif 598 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 599 /* 600 * Accept pre-draft HT ie's if the 601 * standard ones have not been seen. 602 */ 603 if (ishtcapoui(frm)) { 604 if (scan->htcap == NULL) 605 scan->htcap = frm; 606 } else if (ishtinfooui(frm)) { 607 if (scan->htinfo == NULL) 608 scan->htcap = frm; 609 } 610 } 611 break; 612 default: 613 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 614 wh, "unhandled", 615 "id %u, len %u", *frm, frm[1]); 616 vap->iv_stats.is_rx_elem_unknown++; 617 break; 618 } 619 frm += frm[1] + 2; 620 } 621 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 622 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 623 if (scan->rates != NULL && scan->xrates != NULL) { 624 /* 625 * NB: don't process XRATES if RATES is missing. This 626 * avoids a potential null ptr deref and should be ok 627 * as the return code will already note RATES is missing 628 * (so callers shouldn't otherwise process the frame). 629 */ 630 IEEE80211_VERIFY_ELEMENT(scan->xrates, 631 IEEE80211_RATE_MAXSIZE - scan->rates[1], 632 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 633 } 634 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 635 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 636 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 637 /* 638 * Frame was received on a channel different from the 639 * one indicated in the DS params element id; 640 * silently discard it. 641 * 642 * NB: this can happen due to signal leakage. 643 * But we should take it for FH phy because 644 * the rssi value should be correct even for 645 * different hop pattern in FH. 646 */ 647 IEEE80211_DISCARD(vap, 648 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 649 wh, NULL, "for off-channel %u", scan->chan); 650 vap->iv_stats.is_rx_chanmismatch++; 651 scan->status |= IEEE80211_BPARSE_OFFCHAN; 652 } 653 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 654 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 655 IEEE80211_DISCARD(vap, 656 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 657 wh, NULL, "bogus beacon interval", scan->bintval); 658 vap->iv_stats.is_rx_badbintval++; 659 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 660 } 661 if (scan->country != NULL) { 662 /* 663 * Validate we have at least enough data to extract 664 * the country code. Not sure if we should return an 665 * error instead of discarding the IE; consider this 666 * being lenient as we don't depend on the data for 667 * correct operation. 668 */ 669 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 670 scan->country = NULL); 671 } 672 if (scan->csa != NULL) { 673 /* 674 * Validate Channel Switch Announcement; this must 675 * be the correct length or we toss the frame. 676 */ 677 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 678 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 679 } 680 /* 681 * Process HT ie's. This is complicated by our 682 * accepting both the standard ie's and the pre-draft 683 * vendor OUI ie's that some vendors still use/require. 684 */ 685 if (scan->htcap != NULL) { 686 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 687 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 688 4 + sizeof(struct ieee80211_ie_htcap)-2 : 689 sizeof(struct ieee80211_ie_htcap)-2, 690 scan->htcap = NULL); 691 } 692 if (scan->htinfo != NULL) { 693 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 694 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 695 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 696 sizeof(struct ieee80211_ie_htinfo)-2, 697 scan->htinfo = NULL); 698 } 699 return scan->status; 700 } 701 702 /* 703 * Parse an Action frame. Return 0 on success, non-zero on failure. 704 */ 705 int 706 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 707 { 708 struct ieee80211vap *vap = ni->ni_vap; 709 const struct ieee80211_action *ia; 710 struct ieee80211_frame *wh; 711 uint8_t *frm, *efrm; 712 713 /* 714 * action frame format: 715 * [1] category 716 * [1] action 717 * [tlv] parameters 718 */ 719 wh = mtod(m, struct ieee80211_frame *); 720 frm = (u_int8_t *)&wh[1]; 721 efrm = mtod(m, u_int8_t *) + m->m_len; 722 IEEE80211_VERIFY_LENGTH(efrm - frm, 723 sizeof(struct ieee80211_action), return EINVAL); 724 ia = (const struct ieee80211_action *) frm; 725 726 vap->iv_stats.is_rx_action++; 727 IEEE80211_NODE_STAT(ni, rx_action); 728 729 /* verify frame payloads but defer processing */ 730 /* XXX maybe push this to method */ 731 switch (ia->ia_category) { 732 case IEEE80211_ACTION_CAT_BA: 733 switch (ia->ia_action) { 734 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 735 IEEE80211_VERIFY_LENGTH(efrm - frm, 736 sizeof(struct ieee80211_action_ba_addbarequest), 737 return EINVAL); 738 break; 739 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 740 IEEE80211_VERIFY_LENGTH(efrm - frm, 741 sizeof(struct ieee80211_action_ba_addbaresponse), 742 return EINVAL); 743 break; 744 case IEEE80211_ACTION_BA_DELBA: 745 IEEE80211_VERIFY_LENGTH(efrm - frm, 746 sizeof(struct ieee80211_action_ba_delba), 747 return EINVAL); 748 break; 749 } 750 break; 751 case IEEE80211_ACTION_CAT_HT: 752 switch (ia->ia_action) { 753 case IEEE80211_ACTION_HT_TXCHWIDTH: 754 IEEE80211_VERIFY_LENGTH(efrm - frm, 755 sizeof(struct ieee80211_action_ht_txchwidth), 756 return EINVAL); 757 break; 758 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 759 IEEE80211_VERIFY_LENGTH(efrm - frm, 760 sizeof(struct ieee80211_action_ht_mimopowersave), 761 return EINVAL); 762 break; 763 } 764 break; 765 } 766 return 0; 767 } 768 769 #ifdef IEEE80211_DEBUG 770 /* 771 * Debugging support. 772 */ 773 void 774 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 775 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 776 { 777 printf("[%s] discard %s frame, ssid mismatch: ", 778 ether_sprintf(mac), tag); 779 ieee80211_print_essid(ssid + 2, ssid[1]); 780 printf("\n"); 781 } 782 783 /* 784 * Return the bssid of a frame. 785 */ 786 static const uint8_t * 787 ieee80211_getbssid(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 788 { 789 if (vap->iv_opmode == IEEE80211_M_STA) 790 return wh->i_addr2; 791 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 792 return wh->i_addr1; 793 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 794 return wh->i_addr1; 795 return wh->i_addr3; 796 } 797 798 #include <machine/stdarg.h> 799 800 void 801 ieee80211_note(struct ieee80211vap *vap, const char *fmt, ...) 802 { 803 char buf[128]; /* XXX */ 804 va_list ap; 805 806 va_start(ap, fmt); 807 vsnprintf(buf, sizeof(buf), fmt, ap); 808 va_end(ap); 809 810 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 811 } 812 813 void 814 ieee80211_note_frame(struct ieee80211vap *vap, 815 const struct ieee80211_frame *wh, 816 const char *fmt, ...) 817 { 818 char buf[128]; /* XXX */ 819 va_list ap; 820 821 va_start(ap, fmt); 822 vsnprintf(buf, sizeof(buf), fmt, ap); 823 va_end(ap); 824 if_printf(vap->iv_ifp, "[%s] %s\n", 825 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 826 } 827 828 void 829 ieee80211_note_mac(struct ieee80211vap *vap, 830 const uint8_t mac[IEEE80211_ADDR_LEN], 831 const char *fmt, ...) 832 { 833 char buf[128]; /* XXX */ 834 va_list ap; 835 836 va_start(ap, fmt); 837 vsnprintf(buf, sizeof(buf), fmt, ap); 838 va_end(ap); 839 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 840 } 841 842 void 843 ieee80211_discard_frame(struct ieee80211vap *vap, 844 const struct ieee80211_frame *wh, 845 const char *type, const char *fmt, ...) 846 { 847 va_list ap; 848 849 if_printf(vap->iv_ifp, "[%s] discard ", 850 ether_sprintf(ieee80211_getbssid(vap, wh))); 851 if (type == NULL) { 852 printf("%s frame, ", ieee80211_mgt_subtype_name[ 853 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 854 IEEE80211_FC0_SUBTYPE_SHIFT]); 855 } else 856 printf("%s frame, ", type); 857 va_start(ap, fmt); 858 vprintf(fmt, ap); 859 va_end(ap); 860 printf("\n"); 861 } 862 863 void 864 ieee80211_discard_ie(struct ieee80211vap *vap, 865 const struct ieee80211_frame *wh, 866 const char *type, const char *fmt, ...) 867 { 868 va_list ap; 869 870 if_printf(vap->iv_ifp, "[%s] discard ", 871 ether_sprintf(ieee80211_getbssid(vap, wh))); 872 if (type != NULL) 873 printf("%s information element, ", type); 874 else 875 printf("information element, "); 876 va_start(ap, fmt); 877 vprintf(fmt, ap); 878 va_end(ap); 879 printf("\n"); 880 } 881 882 void 883 ieee80211_discard_mac(struct ieee80211vap *vap, 884 const uint8_t mac[IEEE80211_ADDR_LEN], 885 const char *type, const char *fmt, ...) 886 { 887 va_list ap; 888 889 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 890 if (type != NULL) 891 printf("%s frame, ", type); 892 else 893 printf("frame, "); 894 va_start(ap, fmt); 895 vprintf(fmt, ap); 896 va_end(ap); 897 printf("\n"); 898 } 899 #endif /* IEEE80211_DEBUG */ 900