1 /*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2008 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, 59 struct mbuf *m, int rssi, int noise, u_int32_t rstamp) 60 { 61 struct ieee80211vap *vap; 62 int type = -1; 63 64 /* XXX locking */ 65 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 66 struct ieee80211_node *ni; 67 struct mbuf *mcopy; 68 69 /* 70 * WDS vap's only receive directed traffic from the 71 * station at the ``far end''. That traffic should 72 * be passed through the AP vap the station is associated 73 * to--so don't spam them with mcast frames. 74 */ 75 if (vap->iv_opmode == IEEE80211_M_WDS) 76 continue; 77 if (TAILQ_NEXT(vap, iv_next) != NULL) { 78 /* 79 * Packet contents are changed by ieee80211_decap 80 * so do a deep copy of the packet. 81 */ 82 mcopy = m_dup(m, M_DONTWAIT); 83 if (mcopy == NULL) { 84 /* XXX stat+msg */ 85 continue; 86 } 87 } else { 88 mcopy = m; 89 m = NULL; 90 } 91 ni = ieee80211_ref_node(vap->iv_bss); 92 type = ieee80211_input(ni, mcopy, rssi, noise, rstamp); 93 ieee80211_free_node(ni); 94 } 95 if (m != NULL) /* no vaps, reclaim mbuf */ 96 m_freem(m); 97 return type; 98 } 99 100 /* 101 * This function reassemble fragments. 102 * 103 * XXX should handle 3 concurrent reassemblies per-spec. 104 */ 105 struct mbuf * 106 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace) 107 { 108 struct ieee80211vap *vap = ni->ni_vap; 109 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 110 struct ieee80211_frame *lwh; 111 uint16_t rxseq; 112 uint8_t fragno; 113 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 114 struct mbuf *mfrag; 115 116 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 117 118 rxseq = le16toh(*(uint16_t *)wh->i_seq); 119 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 120 121 /* Quick way out, if there's nothing to defragment */ 122 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 123 return m; 124 125 /* 126 * Remove frag to insure it doesn't get reaped by timer. 127 */ 128 if (ni->ni_table == NULL) { 129 /* 130 * Should never happen. If the node is orphaned (not in 131 * the table) then input packets should not reach here. 132 * Otherwise, a concurrent request that yanks the table 133 * should be blocked by other interlocking and/or by first 134 * shutting the driver down. Regardless, be defensive 135 * here and just bail 136 */ 137 /* XXX need msg+stat */ 138 m_freem(m); 139 return NULL; 140 } 141 IEEE80211_NODE_LOCK(ni->ni_table); 142 mfrag = ni->ni_rxfrag[0]; 143 ni->ni_rxfrag[0] = NULL; 144 IEEE80211_NODE_UNLOCK(ni->ni_table); 145 146 /* 147 * Validate new fragment is in order and 148 * related to the previous ones. 149 */ 150 if (mfrag != NULL) { 151 uint16_t last_rxseq; 152 153 lwh = mtod(mfrag, struct ieee80211_frame *); 154 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 155 /* NB: check seq # and frag together */ 156 if (rxseq != last_rxseq+1 || 157 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || 158 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 159 /* 160 * Unrelated fragment or no space for it, 161 * clear current fragments. 162 */ 163 m_freem(mfrag); 164 mfrag = NULL; 165 } 166 } 167 168 if (mfrag == NULL) { 169 if (fragno != 0) { /* !first fragment, discard */ 170 vap->iv_stats.is_rx_defrag++; 171 IEEE80211_NODE_STAT(ni, rx_defrag); 172 m_freem(m); 173 return NULL; 174 } 175 mfrag = m; 176 } else { /* concatenate */ 177 m_adj(m, hdrspace); /* strip header */ 178 m_cat(mfrag, m); 179 /* NB: m_cat doesn't update the packet header */ 180 mfrag->m_pkthdr.len += m->m_pkthdr.len; 181 /* track last seqnum and fragno */ 182 lwh = mtod(mfrag, struct ieee80211_frame *); 183 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 184 } 185 if (more_frag) { /* more to come, save */ 186 ni->ni_rxfragstamp = ticks; 187 ni->ni_rxfrag[0] = mfrag; 188 mfrag = NULL; 189 } 190 return mfrag; 191 } 192 193 void 194 ieee80211_deliver_data(struct ieee80211vap *vap, 195 struct ieee80211_node *ni, struct mbuf *m) 196 { 197 struct ether_header *eh = mtod(m, struct ether_header *); 198 struct ifnet *ifp = vap->iv_ifp; 199 200 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 201 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 202 /* 203 * Do accounting. 204 */ 205 ifp->if_ipackets++; 206 IEEE80211_NODE_STAT(ni, rx_data); 207 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 208 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 209 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 210 IEEE80211_NODE_STAT(ni, rx_mcast); 211 } else 212 IEEE80211_NODE_STAT(ni, rx_ucast); 213 m->m_pkthdr.rcvif = ifp; 214 215 /* clear driver/net80211 flags before passing up */ 216 m->m_flags &= ~M_80211_RX; 217 218 if (ni->ni_vlan != 0) { 219 /* attach vlan tag */ 220 m->m_pkthdr.ether_vtag = ni->ni_vlan; 221 m->m_flags |= M_VLANTAG; 222 } 223 ifp->if_input(ifp, m); 224 } 225 226 struct mbuf * 227 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 228 { 229 struct ieee80211_qosframe_addr4 wh; /* Max size address frames */ 230 struct ether_header *eh; 231 struct llc *llc; 232 233 if (m->m_len < hdrlen + sizeof(*llc) && 234 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 235 /* XXX stat, msg */ 236 return NULL; 237 } 238 memcpy(&wh, mtod(m, caddr_t), hdrlen); 239 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 240 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 241 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 242 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 243 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 244 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 245 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 246 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 247 llc = NULL; 248 } else { 249 m_adj(m, hdrlen - sizeof(*eh)); 250 } 251 eh = mtod(m, struct ether_header *); 252 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 253 case IEEE80211_FC1_DIR_NODS: 254 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 255 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 256 break; 257 case IEEE80211_FC1_DIR_TODS: 258 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 259 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 260 break; 261 case IEEE80211_FC1_DIR_FROMDS: 262 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 263 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 264 break; 265 case IEEE80211_FC1_DIR_DSTODS: 266 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 267 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 268 break; 269 } 270 #ifdef ALIGNED_POINTER 271 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 272 struct mbuf *n, *n0, **np; 273 caddr_t newdata; 274 int off, pktlen; 275 276 n0 = NULL; 277 np = &n0; 278 off = 0; 279 pktlen = m->m_pkthdr.len; 280 while (pktlen > off) { 281 if (n0 == NULL) { 282 MGETHDR(n, M_DONTWAIT, MT_DATA); 283 if (n == NULL) { 284 m_freem(m); 285 return NULL; 286 } 287 M_MOVE_PKTHDR(n, m); 288 n->m_len = MHLEN; 289 } else { 290 MGET(n, M_DONTWAIT, MT_DATA); 291 if (n == NULL) { 292 m_freem(m); 293 m_freem(n0); 294 return NULL; 295 } 296 n->m_len = MLEN; 297 } 298 if (pktlen - off >= MINCLSIZE) { 299 MCLGET(n, M_DONTWAIT); 300 if (n->m_flags & M_EXT) 301 n->m_len = n->m_ext.ext_size; 302 } 303 if (n0 == NULL) { 304 newdata = 305 (caddr_t)ALIGN(n->m_data + sizeof(*eh)) - 306 sizeof(*eh); 307 n->m_len -= newdata - n->m_data; 308 n->m_data = newdata; 309 } 310 if (n->m_len > pktlen - off) 311 n->m_len = pktlen - off; 312 m_copydata(m, off, n->m_len, mtod(n, caddr_t)); 313 off += n->m_len; 314 *np = n; 315 np = &n->m_next; 316 } 317 m_freem(m); 318 m = n0; 319 } 320 #endif /* ALIGNED_POINTER */ 321 if (llc != NULL) { 322 eh = mtod(m, struct ether_header *); 323 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 324 } 325 return m; 326 } 327 328 /* 329 * Decap a frame encapsulated in a fast-frame/A-MSDU. 330 */ 331 struct mbuf * 332 ieee80211_decap1(struct mbuf *m, int *framelen) 333 { 334 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 335 struct ether_header *eh; 336 struct llc *llc; 337 338 /* 339 * The frame has an 802.3 header followed by an 802.2 340 * LLC header. The encapsulated frame length is in the 341 * first header type field; save that and overwrite it 342 * with the true type field found in the second. Then 343 * copy the 802.3 header up to where it belongs and 344 * adjust the mbuf contents to remove the void. 345 */ 346 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 347 return NULL; 348 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 349 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 350 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 351 + sizeof(struct ether_header) - sizeof(struct llc); 352 eh->ether_type = llc->llc_un.type_snap.ether_type; 353 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 354 sizeof(struct ether_header)); 355 m_adj(m, sizeof(struct llc)); 356 return m; 357 #undef FF_LLC_SIZE 358 } 359 360 /* 361 * Decap the encapsulated frame pair and dispatch the first 362 * for delivery. The second frame is returned for delivery 363 * via the normal path. 364 */ 365 struct mbuf * 366 ieee80211_decap_fastframe(struct ieee80211_node *ni, struct mbuf *m) 367 { 368 #define MS(x,f) (((x) & f) >> f##_S) 369 struct ieee80211vap *vap = ni->ni_vap; 370 uint32_t ath; 371 struct mbuf *n; 372 int framelen; 373 374 m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath); 375 if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) { 376 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 377 ni->ni_macaddr, "fast-frame", 378 "unsupport tunnel protocol, header 0x%x", ath); 379 vap->iv_stats.is_ff_badhdr++; 380 m_freem(m); 381 return NULL; 382 } 383 /* NB: skip header and alignment padding */ 384 m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2); 385 386 vap->iv_stats.is_ff_decap++; 387 388 /* 389 * Decap the first frame, bust it apart from the 390 * second and deliver; then decap the second frame 391 * and return it to the caller for normal delivery. 392 */ 393 m = ieee80211_decap1(m, &framelen); 394 if (m == NULL) { 395 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 396 ni->ni_macaddr, "fast-frame", "%s", "first decap failed"); 397 vap->iv_stats.is_ff_tooshort++; 398 return NULL; 399 } 400 n = m_split(m, framelen, M_NOWAIT); 401 if (n == NULL) { 402 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 403 ni->ni_macaddr, "fast-frame", 404 "%s", "unable to split encapsulated frames"); 405 vap->iv_stats.is_ff_split++; 406 m_freem(m); /* NB: must reclaim */ 407 return NULL; 408 } 409 /* XXX not right for WDS */ 410 vap->iv_deliver_data(vap, ni, m); /* 1st of pair */ 411 412 /* 413 * Decap second frame. 414 */ 415 m_adj(n, roundup2(framelen, 4) - framelen); /* padding */ 416 n = ieee80211_decap1(n, &framelen); 417 if (n == NULL) { 418 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 419 ni->ni_macaddr, "fast-frame", "%s", "second decap failed"); 420 vap->iv_stats.is_ff_tooshort++; 421 } 422 /* XXX verify framelen against mbuf contents */ 423 return n; /* 2nd delivered by caller */ 424 #undef MS 425 } 426 427 /* 428 * Install received rate set information in the node's state block. 429 */ 430 int 431 ieee80211_setup_rates(struct ieee80211_node *ni, 432 const uint8_t *rates, const uint8_t *xrates, int flags) 433 { 434 struct ieee80211vap *vap = ni->ni_vap; 435 struct ieee80211_rateset *rs = &ni->ni_rates; 436 437 memset(rs, 0, sizeof(*rs)); 438 rs->rs_nrates = rates[1]; 439 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 440 if (xrates != NULL) { 441 uint8_t nxrates; 442 /* 443 * Tack on 11g extended supported rate element. 444 */ 445 nxrates = xrates[1]; 446 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 447 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 448 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 449 "extended rate set too large; only using " 450 "%u of %u rates", nxrates, xrates[1]); 451 vap->iv_stats.is_rx_rstoobig++; 452 } 453 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 454 rs->rs_nrates += nxrates; 455 } 456 return ieee80211_fix_rate(ni, rs, flags); 457 } 458 459 /* 460 * Send a management frame error response to the specified 461 * station. If ni is associated with the station then use 462 * it; otherwise allocate a temporary node suitable for 463 * transmitting the frame and then free the reference so 464 * it will go away as soon as the frame has been transmitted. 465 */ 466 void 467 ieee80211_send_error(struct ieee80211_node *ni, 468 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 469 { 470 struct ieee80211vap *vap = ni->ni_vap; 471 int istmp; 472 473 if (ni == vap->iv_bss) { 474 if (vap->iv_state != IEEE80211_S_RUN) { 475 /* 476 * XXX hack until we get rid of this routine. 477 * We can be called prior to the vap reaching 478 * run state under certain conditions in which 479 * case iv_bss->ni_chan will not be setup. 480 * Check for this explicitly and and just ignore 481 * the request. 482 */ 483 return; 484 } 485 ni = ieee80211_tmp_node(vap, mac); 486 if (ni == NULL) { 487 /* XXX msg */ 488 return; 489 } 490 istmp = 1; 491 } else 492 istmp = 0; 493 IEEE80211_SEND_MGMT(ni, subtype, arg); 494 if (istmp) 495 ieee80211_free_node(ni); 496 } 497 498 int 499 ieee80211_alloc_challenge(struct ieee80211_node *ni) 500 { 501 if (ni->ni_challenge == NULL) 502 MALLOC(ni->ni_challenge, uint32_t*, IEEE80211_CHALLENGE_LEN, 503 M_80211_NODE, M_NOWAIT); 504 if (ni->ni_challenge == NULL) { 505 IEEE80211_NOTE(ni->ni_vap, 506 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 507 "%s", "shared key challenge alloc failed"); 508 /* XXX statistic */ 509 } 510 return (ni->ni_challenge != NULL); 511 } 512 513 void 514 ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie) 515 { 516 const struct ieee80211_ath_ie *ath = 517 (const struct ieee80211_ath_ie *) ie; 518 519 ni->ni_ath_flags = ath->ath_capability; 520 ni->ni_ath_defkeyix = LE_READ_2(&ath->ath_defkeyix); 521 } 522 523 /* 524 * Parse a Beacon or ProbeResponse frame and return the 525 * useful information in an ieee80211_scanparams structure. 526 * Status is set to 0 if no problems were found; otherwise 527 * a bitmask of IEEE80211_BPARSE_* items is returned that 528 * describes the problems detected. 529 */ 530 int 531 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 532 struct ieee80211_scanparams *scan) 533 { 534 struct ieee80211vap *vap = ni->ni_vap; 535 struct ieee80211com *ic = ni->ni_ic; 536 struct ieee80211_frame *wh; 537 uint8_t *frm, *efrm; 538 539 wh = mtod(m, struct ieee80211_frame *); 540 frm = (uint8_t *)&wh[1]; 541 efrm = mtod(m, uint8_t *) + m->m_len; 542 scan->status = 0; 543 /* 544 * beacon/probe response frame format 545 * [8] time stamp 546 * [2] beacon interval 547 * [2] capability information 548 * [tlv] ssid 549 * [tlv] supported rates 550 * [tlv] country information 551 * [tlv] parameter set (FH/DS) 552 * [tlv] erp information 553 * [tlv] extended supported rates 554 * [tlv] WME 555 * [tlv] WPA or RSN 556 * [tlv] HT capabilities 557 * [tlv] HT information 558 * [tlv] Atheros capabilities 559 */ 560 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 561 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 562 memset(scan, 0, sizeof(*scan)); 563 scan->tstamp = frm; frm += 8; 564 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 565 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 566 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 567 scan->chan = scan->bchan; 568 scan->ies = frm; 569 scan->ies_len = efrm - frm; 570 571 while (efrm - frm > 1) { 572 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 573 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 574 switch (*frm) { 575 case IEEE80211_ELEMID_SSID: 576 scan->ssid = frm; 577 break; 578 case IEEE80211_ELEMID_RATES: 579 scan->rates = frm; 580 break; 581 case IEEE80211_ELEMID_COUNTRY: 582 scan->country = frm; 583 break; 584 case IEEE80211_ELEMID_FHPARMS: 585 if (ic->ic_phytype == IEEE80211_T_FH) { 586 scan->fhdwell = LE_READ_2(&frm[2]); 587 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 588 scan->fhindex = frm[6]; 589 } 590 break; 591 case IEEE80211_ELEMID_DSPARMS: 592 /* 593 * XXX hack this since depending on phytype 594 * is problematic for multi-mode devices. 595 */ 596 if (ic->ic_phytype != IEEE80211_T_FH) 597 scan->chan = frm[2]; 598 break; 599 case IEEE80211_ELEMID_TIM: 600 /* XXX ATIM? */ 601 scan->tim = frm; 602 scan->timoff = frm - mtod(m, uint8_t *); 603 break; 604 case IEEE80211_ELEMID_IBSSPARMS: 605 case IEEE80211_ELEMID_CFPARMS: 606 case IEEE80211_ELEMID_PWRCNSTR: 607 /* NB: avoid debugging complaints */ 608 break; 609 case IEEE80211_ELEMID_XRATES: 610 scan->xrates = frm; 611 break; 612 case IEEE80211_ELEMID_ERP: 613 if (frm[1] != 1) { 614 IEEE80211_DISCARD_IE(vap, 615 IEEE80211_MSG_ELEMID, wh, "ERP", 616 "bad len %u", frm[1]); 617 vap->iv_stats.is_rx_elem_toobig++; 618 break; 619 } 620 scan->erp = frm[2] | 0x100; 621 break; 622 case IEEE80211_ELEMID_HTCAP: 623 scan->htcap = frm; 624 break; 625 case IEEE80211_ELEMID_RSN: 626 scan->rsn = frm; 627 break; 628 case IEEE80211_ELEMID_HTINFO: 629 scan->htinfo = frm; 630 break; 631 case IEEE80211_ELEMID_VENDOR: 632 if (iswpaoui(frm)) 633 scan->wpa = frm; 634 else if (iswmeparam(frm) || iswmeinfo(frm)) 635 scan->wme = frm; 636 else if (isatherosoui(frm)) 637 scan->ath = frm; 638 else if (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 639 /* 640 * Accept pre-draft HT ie's if the 641 * standard ones have not been seen. 642 */ 643 if (ishtcapoui(frm)) { 644 if (scan->htcap == NULL) 645 scan->htcap = frm; 646 } else if (ishtinfooui(frm)) { 647 if (scan->htinfo == NULL) 648 scan->htcap = frm; 649 } 650 } 651 break; 652 default: 653 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 654 wh, "unhandled", 655 "id %u, len %u", *frm, frm[1]); 656 vap->iv_stats.is_rx_elem_unknown++; 657 break; 658 } 659 frm += frm[1] + 2; 660 } 661 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 662 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 663 if (scan->rates != NULL && scan->xrates != NULL) { 664 /* 665 * NB: don't process XRATES if RATES is missing. This 666 * avoids a potential null ptr deref and should be ok 667 * as the return code will already note RATES is missing 668 * (so callers shouldn't otherwise process the frame). 669 */ 670 IEEE80211_VERIFY_ELEMENT(scan->xrates, 671 IEEE80211_RATE_MAXSIZE - scan->rates[1], 672 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 673 } 674 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 675 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 676 #if IEEE80211_CHAN_MAX < 255 677 if (scan->chan > IEEE80211_CHAN_MAX) { 678 IEEE80211_DISCARD(vap, IEEE80211_MSG_ELEMID, 679 wh, NULL, "invalid channel %u", scan->chan); 680 vap->iv_stats.is_rx_badchan++; 681 scan->status |= IEEE80211_BPARSE_CHAN_INVALID; 682 } 683 #endif 684 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 685 /* 686 * Frame was received on a channel different from the 687 * one indicated in the DS params element id; 688 * silently discard it. 689 * 690 * NB: this can happen due to signal leakage. 691 * But we should take it for FH phy because 692 * the rssi value should be correct even for 693 * different hop pattern in FH. 694 */ 695 IEEE80211_DISCARD(vap, 696 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 697 wh, NULL, "for off-channel %u", scan->chan); 698 vap->iv_stats.is_rx_chanmismatch++; 699 scan->status |= IEEE80211_BPARSE_OFFCHAN; 700 } 701 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 702 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 703 IEEE80211_DISCARD(vap, 704 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 705 wh, NULL, "bogus beacon interval", scan->bintval); 706 vap->iv_stats.is_rx_badbintval++; 707 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 708 } 709 if (scan->country != NULL) { 710 /* 711 * Validate we have at least enough data to extract 712 * the country code. Not sure if we should return an 713 * error instead of discarding the IE; consider this 714 * being lenient as we don't depend on the data for 715 * correct operation. 716 */ 717 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 718 scan->country = NULL); 719 } 720 /* 721 * Process HT ie's. This is complicated by our 722 * accepting both the standard ie's and the pre-draft 723 * vendor OUI ie's that some vendors still use/require. 724 */ 725 if (scan->htcap != NULL) { 726 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 727 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 728 4 + sizeof(struct ieee80211_ie_htcap)-2 : 729 sizeof(struct ieee80211_ie_htcap)-2, 730 scan->htcap = NULL); 731 } 732 if (scan->htinfo != NULL) { 733 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 734 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 735 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 736 sizeof(struct ieee80211_ie_htinfo)-2, 737 scan->htinfo = NULL); 738 } 739 return scan->status; 740 } 741 742 /* 743 * Parse an Action frame. Return 0 on success, non-zero on failure. 744 */ 745 int 746 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 747 { 748 struct ieee80211vap *vap = ni->ni_vap; 749 const struct ieee80211_action *ia; 750 struct ieee80211_frame *wh; 751 uint8_t *frm, *efrm; 752 753 /* 754 * action frame format: 755 * [1] category 756 * [1] action 757 * [tlv] parameters 758 */ 759 wh = mtod(m, struct ieee80211_frame *); 760 frm = (u_int8_t *)&wh[1]; 761 efrm = mtod(m, u_int8_t *) + m->m_len; 762 IEEE80211_VERIFY_LENGTH(efrm - frm, 763 sizeof(struct ieee80211_action), return EINVAL); 764 ia = (const struct ieee80211_action *) frm; 765 766 vap->iv_stats.is_rx_action++; 767 IEEE80211_NODE_STAT(ni, rx_action); 768 769 /* verify frame payloads but defer processing */ 770 /* XXX maybe push this to method */ 771 switch (ia->ia_category) { 772 case IEEE80211_ACTION_CAT_BA: 773 switch (ia->ia_action) { 774 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 775 IEEE80211_VERIFY_LENGTH(efrm - frm, 776 sizeof(struct ieee80211_action_ba_addbarequest), 777 return EINVAL); 778 break; 779 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 780 IEEE80211_VERIFY_LENGTH(efrm - frm, 781 sizeof(struct ieee80211_action_ba_addbaresponse), 782 return EINVAL); 783 break; 784 case IEEE80211_ACTION_BA_DELBA: 785 IEEE80211_VERIFY_LENGTH(efrm - frm, 786 sizeof(struct ieee80211_action_ba_delba), 787 return EINVAL); 788 break; 789 } 790 break; 791 case IEEE80211_ACTION_CAT_HT: 792 switch (ia->ia_action) { 793 case IEEE80211_ACTION_HT_TXCHWIDTH: 794 IEEE80211_VERIFY_LENGTH(efrm - frm, 795 sizeof(struct ieee80211_action_ht_txchwidth), 796 return EINVAL); 797 break; 798 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 799 IEEE80211_VERIFY_LENGTH(efrm - frm, 800 sizeof(struct ieee80211_action_ht_mimopowersave), 801 return EINVAL); 802 break; 803 } 804 break; 805 } 806 return 0; 807 } 808 809 #ifdef IEEE80211_DEBUG 810 /* 811 * Debugging support. 812 */ 813 void 814 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 815 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 816 { 817 printf("[%s] discard %s frame, ssid mismatch: ", 818 ether_sprintf(mac), tag); 819 ieee80211_print_essid(ssid + 2, ssid[1]); 820 printf("\n"); 821 } 822 823 /* 824 * Return the bssid of a frame. 825 */ 826 static const uint8_t * 827 ieee80211_getbssid(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 828 { 829 if (vap->iv_opmode == IEEE80211_M_STA) 830 return wh->i_addr2; 831 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 832 return wh->i_addr1; 833 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 834 return wh->i_addr1; 835 return wh->i_addr3; 836 } 837 838 #include <machine/stdarg.h> 839 840 void 841 ieee80211_note(struct ieee80211vap *vap, const char *fmt, ...) 842 { 843 char buf[128]; /* XXX */ 844 va_list ap; 845 846 va_start(ap, fmt); 847 vsnprintf(buf, sizeof(buf), fmt, ap); 848 va_end(ap); 849 850 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 851 } 852 853 void 854 ieee80211_note_frame(struct ieee80211vap *vap, 855 const struct ieee80211_frame *wh, 856 const char *fmt, ...) 857 { 858 char buf[128]; /* XXX */ 859 va_list ap; 860 861 va_start(ap, fmt); 862 vsnprintf(buf, sizeof(buf), fmt, ap); 863 va_end(ap); 864 if_printf(vap->iv_ifp, "[%s] %s\n", 865 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 866 } 867 868 void 869 ieee80211_note_mac(struct ieee80211vap *vap, 870 const uint8_t mac[IEEE80211_ADDR_LEN], 871 const char *fmt, ...) 872 { 873 char buf[128]; /* XXX */ 874 va_list ap; 875 876 va_start(ap, fmt); 877 vsnprintf(buf, sizeof(buf), fmt, ap); 878 va_end(ap); 879 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 880 } 881 882 void 883 ieee80211_discard_frame(struct ieee80211vap *vap, 884 const struct ieee80211_frame *wh, 885 const char *type, const char *fmt, ...) 886 { 887 va_list ap; 888 889 if_printf(vap->iv_ifp, "[%s] discard ", 890 ether_sprintf(ieee80211_getbssid(vap, wh))); 891 if (type == NULL) { 892 printf("%s frame, ", ieee80211_mgt_subtype_name[ 893 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 894 IEEE80211_FC0_SUBTYPE_SHIFT]); 895 } else 896 printf("%s frame, ", type); 897 va_start(ap, fmt); 898 vprintf(fmt, ap); 899 va_end(ap); 900 printf("\n"); 901 } 902 903 void 904 ieee80211_discard_ie(struct ieee80211vap *vap, 905 const struct ieee80211_frame *wh, 906 const char *type, const char *fmt, ...) 907 { 908 va_list ap; 909 910 if_printf(vap->iv_ifp, "[%s] discard ", 911 ether_sprintf(ieee80211_getbssid(vap, wh))); 912 if (type != NULL) 913 printf("%s information element, ", type); 914 else 915 printf("information element, "); 916 va_start(ap, fmt); 917 vprintf(fmt, ap); 918 va_end(ap); 919 printf("\n"); 920 } 921 922 void 923 ieee80211_discard_mac(struct ieee80211vap *vap, 924 const uint8_t mac[IEEE80211_ADDR_LEN], 925 const char *type, const char *fmt, ...) 926 { 927 va_list ap; 928 929 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 930 if (type != NULL) 931 printf("%s frame, ", type); 932 else 933 printf("frame, "); 934 va_start(ap, fmt); 935 vprintf(fmt, ap); 936 va_end(ap); 937 printf("\n"); 938 } 939 #endif /* IEEE80211_DEBUG */ 940