1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2001 Atsushi Onoe 5 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 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_var.h> 44 #include <net/if_llc.h> 45 #include <net/if_media.h> 46 #include <net/if_private.h> 47 #include <net/if_vlan_var.h> 48 49 #include <net80211/ieee80211_var.h> 50 #include <net80211/ieee80211_input.h> 51 #ifdef IEEE80211_SUPPORT_MESH 52 #include <net80211/ieee80211_mesh.h> 53 #endif 54 55 #include <net/bpf.h> 56 57 #ifdef INET 58 #include <netinet/in.h> 59 #include <net/ethernet.h> 60 #endif 61 62 static void 63 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx) 64 { 65 int i; 66 67 /* Verify the required MIMO bits are set */ 68 if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) != 69 (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) 70 return; 71 72 /* XXX This assumes the MIMO radios have both ctl and ext chains */ 73 for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) { 74 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]); 75 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]); 76 } 77 78 /* XXX This also assumes the MIMO radios have both ctl and ext chains */ 79 for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) { 80 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i]; 81 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i]; 82 } 83 ni->ni_mimo_chains = rx->c_chain; 84 } 85 86 int 87 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m) 88 { 89 struct ieee80211_rx_stats rxs; 90 91 /* try to read stats from mbuf */ 92 bzero(&rxs, sizeof(rxs)); 93 if (ieee80211_get_rx_params(m, &rxs) != 0) 94 return (-1); 95 96 /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */ 97 ieee80211_process_mimo(ni, &rxs); 98 99 //return ieee80211_input(ni, m, rx->rssi, rx->nf); 100 return ni->ni_vap->iv_input(ni, m, &rxs, rxs.c_rssi, rxs.c_nf); 101 } 102 103 int 104 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf) 105 { 106 struct ieee80211_rx_stats rx; 107 108 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI; 109 rx.c_nf = nf; 110 rx.c_rssi = rssi; 111 112 if (!ieee80211_add_rx_params(m, &rx)) 113 return (-1); 114 115 return ieee80211_input_mimo_all(ic, m); 116 } 117 118 int 119 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m) 120 { 121 struct ieee80211vap *vap; 122 int type = -1; 123 124 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */ 125 126 /* XXX locking */ 127 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 128 struct ieee80211_node *ni; 129 struct mbuf *mcopy; 130 131 /* NB: could check for IFF_UP but this is cheaper */ 132 if (vap->iv_state == IEEE80211_S_INIT) 133 continue; 134 /* 135 * WDS vap's only receive directed traffic from the 136 * station at the ``far end''. That traffic should 137 * be passed through the AP vap the station is associated 138 * to--so don't spam them with mcast frames. 139 */ 140 if (vap->iv_opmode == IEEE80211_M_WDS) 141 continue; 142 if (TAILQ_NEXT(vap, iv_next) != NULL) { 143 /* 144 * Packet contents are changed by ieee80211_decap 145 * so do a deep copy of the packet. 146 * NB: tags are copied too. 147 */ 148 mcopy = m_dup(m, IEEE80211_M_NOWAIT); 149 if (mcopy == NULL) { 150 /* XXX stat+msg */ 151 continue; 152 } 153 } else { 154 mcopy = m; 155 m = NULL; 156 } 157 ni = ieee80211_ref_node(vap->iv_bss); 158 type = ieee80211_input_mimo(ni, mcopy); 159 ieee80211_free_node(ni); 160 } 161 if (m != NULL) /* no vaps, reclaim mbuf */ 162 m_freem(m); 163 return type; 164 } 165 166 /* 167 * This function reassembles fragments. 168 * 169 * XXX should handle 3 concurrent reassemblies per-spec. 170 */ 171 struct mbuf * 172 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace, 173 int has_decrypted) 174 { 175 struct ieee80211vap *vap = ni->ni_vap; 176 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 177 struct ieee80211_frame *lwh; 178 uint16_t rxseq; 179 uint8_t fragno; 180 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 181 struct mbuf *mfrag; 182 183 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 184 185 rxseq = le16toh(*(uint16_t *)wh->i_seq); 186 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 187 188 /* Quick way out, if there's nothing to defragment */ 189 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 190 return m; 191 192 /* Temporarily set flag to remember if fragment was encrypted. */ 193 /* XXX use a non-packet altering storage for this in the future. */ 194 if (has_decrypted) 195 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED; 196 197 /* 198 * Remove frag to insure it doesn't get reaped by timer. 199 */ 200 if (ni->ni_table == NULL) { 201 /* 202 * Should never happen. If the node is orphaned (not in 203 * the table) then input packets should not reach here. 204 * Otherwise, a concurrent request that yanks the table 205 * should be blocked by other interlocking and/or by first 206 * shutting the driver down. Regardless, be defensive 207 * here and just bail 208 */ 209 /* XXX need msg+stat */ 210 m_freem(m); 211 return NULL; 212 } 213 IEEE80211_NODE_LOCK(ni->ni_table); 214 mfrag = ni->ni_rxfrag[0]; 215 ni->ni_rxfrag[0] = NULL; 216 IEEE80211_NODE_UNLOCK(ni->ni_table); 217 218 /* 219 * Validate new fragment is in order and 220 * related to the previous ones. 221 */ 222 if (mfrag != NULL) { 223 uint16_t last_rxseq; 224 225 lwh = mtod(mfrag, struct ieee80211_frame *); 226 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 227 /* 228 * NB: check seq # and frag together. Also check that both 229 * fragments are plaintext or that both are encrypted. 230 */ 231 if (rxseq == last_rxseq+1 && 232 IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) && 233 IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2) && 234 !((wh->i_fc[1] ^ lwh->i_fc[1]) & IEEE80211_FC1_PROTECTED)) { 235 /* XXX clear MORE_FRAG bit? */ 236 /* track last seqnum and fragno */ 237 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 238 239 m_adj(m, hdrspace); /* strip header */ 240 m_catpkt(mfrag, m); /* concatenate */ 241 } else { 242 /* 243 * Unrelated fragment or no space for it, 244 * clear current fragments. 245 */ 246 m_freem(mfrag); 247 mfrag = NULL; 248 } 249 } 250 251 if (mfrag == NULL) { 252 if (fragno != 0) { /* !first fragment, discard */ 253 vap->iv_stats.is_rx_defrag++; 254 IEEE80211_NODE_STAT(ni, rx_defrag); 255 m_freem(m); 256 return NULL; 257 } 258 mfrag = m; 259 } 260 if (more_frag) { /* more to come, save */ 261 ni->ni_rxfragstamp = ticks; 262 ni->ni_rxfrag[0] = mfrag; 263 mfrag = NULL; 264 } 265 /* Remember to clear protected flag that was temporarily set. */ 266 if (mfrag != NULL) { 267 wh = mtod(mfrag, struct ieee80211_frame *); 268 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 269 } 270 return mfrag; 271 } 272 273 void 274 ieee80211_deliver_data(struct ieee80211vap *vap, 275 struct ieee80211_node *ni, struct mbuf *m) 276 { 277 struct ether_header *eh = mtod(m, struct ether_header *); 278 struct ifnet *ifp = vap->iv_ifp; 279 280 /* clear driver/net80211 flags before passing up */ 281 m->m_flags &= ~(M_MCAST | M_BCAST); 282 m_clrprotoflags(m); 283 284 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 285 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 286 /* 287 * Do accounting. 288 */ 289 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 290 IEEE80211_NODE_STAT(ni, rx_data); 291 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 292 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 293 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 294 m->m_flags |= M_BCAST; 295 else 296 m->m_flags |= M_MCAST; 297 IEEE80211_NODE_STAT(ni, rx_mcast); 298 } else 299 IEEE80211_NODE_STAT(ni, rx_ucast); 300 m->m_pkthdr.rcvif = ifp; 301 302 if (ni->ni_vlan != 0) { 303 /* attach vlan tag */ 304 m->m_pkthdr.ether_vtag = ni->ni_vlan; 305 m->m_flags |= M_VLANTAG; 306 } 307 ifp->if_input(ifp, m); 308 } 309 310 struct mbuf * 311 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen, 312 uint8_t qos) 313 { 314 struct ieee80211_qosframe_addr4 wh; 315 struct ether_header *eh; 316 struct llc *llc; 317 318 KASSERT(hdrlen <= sizeof(wh), 319 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 320 321 if (m->m_len < hdrlen + sizeof(*llc) && 322 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 323 vap->iv_stats.is_rx_tooshort++; 324 /* XXX msg */ 325 return NULL; 326 } 327 memcpy(&wh, mtod(m, caddr_t), hdrlen); 328 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 329 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 330 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 331 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 332 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 333 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 334 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX)) && 335 /* Do not want to touch A-MSDU frames. */ 336 !(qos & IEEE80211_QOS_AMSDU)) { 337 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 338 llc = NULL; 339 } else { 340 m_adj(m, hdrlen - sizeof(*eh)); 341 } 342 eh = mtod(m, struct ether_header *); 343 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 344 case IEEE80211_FC1_DIR_NODS: 345 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 346 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 347 break; 348 case IEEE80211_FC1_DIR_TODS: 349 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 350 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 351 break; 352 case IEEE80211_FC1_DIR_FROMDS: 353 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 354 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 355 break; 356 case IEEE80211_FC1_DIR_DSTODS: 357 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 358 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 359 break; 360 } 361 #ifndef __NO_STRICT_ALIGNMENT 362 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 363 m = ieee80211_realign(vap, m, sizeof(*eh)); 364 if (m == NULL) 365 return NULL; 366 } 367 #endif /* !__NO_STRICT_ALIGNMENT */ 368 if (llc != NULL) { 369 eh = mtod(m, struct ether_header *); 370 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 371 } 372 return m; 373 } 374 375 /* 376 * Decap a frame encapsulated in a fast-frame/A-MSDU. 377 */ 378 struct mbuf * 379 ieee80211_decap1(struct mbuf *m, int *framelen) 380 { 381 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 382 struct ether_header *eh; 383 struct llc *llc; 384 const uint8_t llc_hdr_mac[ETHER_ADDR_LEN] = { 385 /* MAC address matching the 802.2 LLC header */ 386 LLC_SNAP_LSAP, LLC_SNAP_LSAP, LLC_UI, 0, 0, 0 387 }; 388 389 /* 390 * The frame has an 802.3 header followed by an 802.2 391 * LLC header. The encapsulated frame length is in the 392 * first header type field; save that and overwrite it 393 * with the true type field found in the second. Then 394 * copy the 802.3 header up to where it belongs and 395 * adjust the mbuf contents to remove the void. 396 */ 397 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 398 return NULL; 399 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 400 401 /* 402 * Detect possible attack where a single 802.11 frame is processed 403 * as an A-MSDU frame due to an adversary setting the A-MSDU present 404 * bit in the 802.11 QoS header. [FragAttacks] 405 */ 406 if (memcmp(eh->ether_dhost, llc_hdr_mac, ETHER_ADDR_LEN) == 0) 407 return NULL; 408 409 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 410 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 411 + sizeof(struct ether_header) - sizeof(struct llc); 412 eh->ether_type = llc->llc_un.type_snap.ether_type; 413 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 414 sizeof(struct ether_header)); 415 m_adj(m, sizeof(struct llc)); 416 return m; 417 #undef FF_LLC_SIZE 418 } 419 420 /* 421 * Install received rate set information in the node's state block. 422 */ 423 int 424 ieee80211_setup_rates(struct ieee80211_node *ni, 425 const uint8_t *rates, const uint8_t *xrates, int flags) 426 { 427 struct ieee80211vap *vap = ni->ni_vap; 428 struct ieee80211_rateset *rs = &ni->ni_rates; 429 430 memset(rs, 0, sizeof(*rs)); 431 rs->rs_nrates = rates[1]; 432 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 433 if (xrates != NULL) { 434 uint8_t nxrates; 435 /* 436 * Tack on 11g extended supported rate element. 437 */ 438 nxrates = xrates[1]; 439 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 440 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 441 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 442 "extended rate set too large; only using " 443 "%u of %u rates", nxrates, xrates[1]); 444 vap->iv_stats.is_rx_rstoobig++; 445 } 446 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 447 rs->rs_nrates += nxrates; 448 } 449 return ieee80211_fix_rate(ni, rs, flags); 450 } 451 452 /* 453 * Send a management frame error response to the specified 454 * station. If ni is associated with the station then use 455 * it; otherwise allocate a temporary node suitable for 456 * transmitting the frame and then free the reference so 457 * it will go away as soon as the frame has been transmitted. 458 */ 459 void 460 ieee80211_send_error(struct ieee80211_node *ni, 461 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 462 { 463 struct ieee80211vap *vap = ni->ni_vap; 464 int istmp; 465 466 if (ni == vap->iv_bss) { 467 if (vap->iv_state != IEEE80211_S_RUN) { 468 /* 469 * XXX hack until we get rid of this routine. 470 * We can be called prior to the vap reaching 471 * run state under certain conditions in which 472 * case iv_bss->ni_chan will not be setup. 473 * Check for this explicitly and and just ignore 474 * the request. 475 */ 476 return; 477 } 478 ni = ieee80211_tmp_node(vap, mac); 479 if (ni == NULL) { 480 /* XXX msg */ 481 return; 482 } 483 istmp = 1; 484 } else 485 istmp = 0; 486 IEEE80211_SEND_MGMT(ni, subtype, arg); 487 if (istmp) 488 ieee80211_free_node(ni); 489 } 490 491 int 492 ieee80211_alloc_challenge(struct ieee80211_node *ni) 493 { 494 if (ni->ni_challenge == NULL) 495 ni->ni_challenge = (uint32_t *) 496 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN, 497 M_80211_NODE, IEEE80211_M_NOWAIT); 498 if (ni->ni_challenge == NULL) { 499 IEEE80211_NOTE(ni->ni_vap, 500 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 501 "%s", "shared key challenge alloc failed"); 502 /* XXX statistic */ 503 } 504 return (ni->ni_challenge != NULL); 505 } 506 507 /* 508 * Parse a Beacon or ProbeResponse frame and return the 509 * useful information in an ieee80211_scanparams structure. 510 * Status is set to 0 if no problems were found; otherwise 511 * a bitmask of IEEE80211_BPARSE_* items is returned that 512 * describes the problems detected. 513 */ 514 int 515 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 516 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan) 517 { 518 struct ieee80211vap *vap = ni->ni_vap; 519 struct ieee80211com *ic = ni->ni_ic; 520 struct ieee80211_frame *wh; 521 uint8_t *frm, *efrm; 522 523 wh = mtod(m, struct ieee80211_frame *); 524 frm = (uint8_t *)&wh[1]; 525 efrm = mtod(m, uint8_t *) + m->m_len; 526 scan->status = 0; 527 /* 528 * beacon/probe response frame format 529 * 530 * XXX Update from 802.11-2012 - eg where HT is 531 * [8] time stamp 532 * [2] beacon interval 533 * [2] capability information 534 * [tlv] ssid 535 * [tlv] supported rates 536 * [tlv] country information 537 * [tlv] channel switch announcement (CSA) 538 * [tlv] parameter set (FH/DS) 539 * [tlv] erp information 540 * [tlv] extended supported rates 541 * [tlv] WME 542 * [tlv] WPA or RSN 543 * [tlv] HT capabilities 544 * [tlv] HT information 545 * [tlv] VHT capabilities 546 * [tlv] VHT information 547 * [tlv] Atheros capabilities 548 * [tlv] Mesh ID 549 * [tlv] Mesh Configuration 550 */ 551 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 552 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 553 memset(scan, 0, sizeof(*scan)); 554 scan->tstamp = frm; frm += 8; 555 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 556 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 557 scan->bchan = ieee80211_chan2ieee(ic, rxchan); 558 scan->chan = scan->bchan; 559 scan->ies = frm; 560 scan->ies_len = efrm - frm; 561 562 while (efrm - frm > 1) { 563 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 564 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 565 switch (*frm) { 566 case IEEE80211_ELEMID_SSID: 567 scan->ssid = frm; 568 break; 569 case IEEE80211_ELEMID_RATES: 570 scan->rates = frm; 571 break; 572 case IEEE80211_ELEMID_COUNTRY: 573 scan->country = frm; 574 break; 575 case IEEE80211_ELEMID_CSA: 576 scan->csa = frm; 577 break; 578 case IEEE80211_ELEMID_QUIET: 579 scan->quiet = frm; 580 break; 581 case IEEE80211_ELEMID_FHPARMS: 582 if (ic->ic_phytype == IEEE80211_T_FH) { 583 scan->fhdwell = le16dec(&frm[2]); 584 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 585 scan->fhindex = frm[6]; 586 } 587 break; 588 case IEEE80211_ELEMID_DSPARMS: 589 /* 590 * XXX hack this since depending on phytype 591 * is problematic for multi-mode devices. 592 */ 593 if (ic->ic_phytype != IEEE80211_T_FH) 594 scan->chan = frm[2]; 595 break; 596 case IEEE80211_ELEMID_TIM: 597 /* XXX ATIM? */ 598 scan->tim = frm; 599 scan->timoff = frm - mtod(m, uint8_t *); 600 break; 601 case IEEE80211_ELEMID_IBSSPARMS: 602 case IEEE80211_ELEMID_CFPARMS: 603 case IEEE80211_ELEMID_PWRCNSTR: 604 case IEEE80211_ELEMID_BSSLOAD: 605 case IEEE80211_ELEMID_APCHANREP: 606 /* NB: avoid debugging complaints */ 607 break; 608 case IEEE80211_ELEMID_XRATES: 609 scan->xrates = frm; 610 break; 611 case IEEE80211_ELEMID_ERP: 612 if (frm[1] != 1) { 613 IEEE80211_DISCARD_IE(vap, 614 IEEE80211_MSG_ELEMID, wh, "ERP", 615 "bad len %u", frm[1]); 616 vap->iv_stats.is_rx_elem_toobig++; 617 break; 618 } 619 scan->erp = frm[2] | 0x100; 620 break; 621 case IEEE80211_ELEMID_HTCAP: 622 scan->htcap = frm; 623 break; 624 case IEEE80211_ELEMID_VHT_CAP: 625 scan->vhtcap = frm; 626 break; 627 case IEEE80211_ELEMID_VHT_OPMODE: 628 scan->vhtopmode = frm; 629 break; 630 case IEEE80211_ELEMID_RSN: 631 scan->rsn = frm; 632 break; 633 case IEEE80211_ELEMID_HTINFO: 634 scan->htinfo = frm; 635 break; 636 #ifdef IEEE80211_SUPPORT_MESH 637 case IEEE80211_ELEMID_MESHID: 638 scan->meshid = frm; 639 break; 640 case IEEE80211_ELEMID_MESHCONF: 641 scan->meshconf = frm; 642 break; 643 #endif 644 /* Extended capabilities; nothing handles it for now */ 645 case IEEE80211_ELEMID_EXTCAP: 646 break; 647 case IEEE80211_ELEMID_VENDOR: 648 if (iswpaoui(frm)) 649 scan->wpa = frm; 650 else if (iswmeparam(frm) || iswmeinfo(frm)) 651 scan->wme = frm; 652 #ifdef IEEE80211_SUPPORT_SUPERG 653 else if (isatherosoui(frm)) 654 scan->ath = frm; 655 #endif 656 #ifdef IEEE80211_SUPPORT_TDMA 657 else if (istdmaoui(frm)) 658 scan->tdma = frm; 659 #endif 660 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 661 /* 662 * Accept pre-draft HT ie's if the 663 * standard ones have not been seen. 664 */ 665 if (ishtcapoui(frm)) { 666 if (scan->htcap == NULL) 667 scan->htcap = frm; 668 } else if (ishtinfooui(frm)) { 669 if (scan->htinfo == NULL) 670 scan->htcap = frm; 671 } 672 } 673 break; 674 default: 675 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 676 wh, "unhandled", 677 "id %u, len %u", *frm, frm[1]); 678 vap->iv_stats.is_rx_elem_unknown++; 679 break; 680 } 681 frm += frm[1] + 2; 682 } 683 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 684 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 685 if (scan->rates != NULL && scan->xrates != NULL) { 686 /* 687 * NB: don't process XRATES if RATES is missing. This 688 * avoids a potential null ptr deref and should be ok 689 * as the return code will already note RATES is missing 690 * (so callers shouldn't otherwise process the frame). 691 */ 692 IEEE80211_VERIFY_ELEMENT(scan->xrates, 693 IEEE80211_RATE_MAXSIZE - scan->rates[1], 694 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 695 } 696 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 697 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 698 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 699 /* 700 * Frame was received on a channel different from the 701 * one indicated in the DS params element id; 702 * silently discard it. 703 * 704 * NB: this can happen due to signal leakage. 705 * But we should take it for FH phy because 706 * the rssi value should be correct even for 707 * different hop pattern in FH. 708 */ 709 IEEE80211_DISCARD(vap, 710 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 711 wh, NULL, "for off-channel %u (bchan=%u)", 712 scan->chan, scan->bchan); 713 vap->iv_stats.is_rx_chanmismatch++; 714 scan->status |= IEEE80211_BPARSE_OFFCHAN; 715 } 716 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 717 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 718 IEEE80211_DISCARD(vap, 719 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 720 wh, NULL, "bogus beacon interval (%d TU)", 721 (int) scan->bintval); 722 vap->iv_stats.is_rx_badbintval++; 723 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 724 } 725 if (scan->country != NULL) { 726 /* 727 * Validate we have at least enough data to extract 728 * the country code. Not sure if we should return an 729 * error instead of discarding the IE; consider this 730 * being lenient as we don't depend on the data for 731 * correct operation. 732 */ 733 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 734 scan->country = NULL); 735 } 736 if (scan->csa != NULL) { 737 /* 738 * Validate Channel Switch Announcement; this must 739 * be the correct length or we toss the frame. 740 */ 741 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 742 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 743 } 744 #ifdef IEEE80211_SUPPORT_MESH 745 if (scan->meshid != NULL) { 746 IEEE80211_VERIFY_ELEMENT(scan->meshid, IEEE80211_MESHID_LEN, 747 scan->status |= IEEE80211_BPARSE_MESHID_INVALID); 748 } 749 #endif 750 /* 751 * Process HT ie's. This is complicated by our 752 * accepting both the standard ie's and the pre-draft 753 * vendor OUI ie's that some vendors still use/require. 754 */ 755 if (scan->htcap != NULL) { 756 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 757 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 758 4 + sizeof(struct ieee80211_ie_htcap)-2 : 759 sizeof(struct ieee80211_ie_htcap)-2, 760 scan->htcap = NULL); 761 } 762 if (scan->htinfo != NULL) { 763 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 764 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 765 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 766 sizeof(struct ieee80211_ie_htinfo)-2, 767 scan->htinfo = NULL); 768 } 769 770 /* Process VHT IEs */ 771 if (scan->vhtcap != NULL) { 772 IEEE80211_VERIFY_LENGTH(scan->vhtcap[1], 773 sizeof(struct ieee80211_ie_vhtcap) - 2, 774 scan->vhtcap = NULL); 775 } 776 if (scan->vhtopmode != NULL) { 777 IEEE80211_VERIFY_LENGTH(scan->vhtopmode[1], 778 sizeof(struct ieee80211_ie_vht_operation) - 2, 779 scan->vhtopmode = NULL); 780 } 781 782 return scan->status; 783 } 784 785 /* 786 * Parse an Action frame. Return 0 on success, non-zero on failure. 787 */ 788 int 789 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 790 { 791 struct ieee80211vap *vap = ni->ni_vap; 792 const struct ieee80211_action *ia; 793 struct ieee80211_frame *wh; 794 uint8_t *frm, *efrm; 795 796 /* 797 * action frame format: 798 * [1] category 799 * [1] action 800 * [tlv] parameters 801 */ 802 wh = mtod(m, struct ieee80211_frame *); 803 frm = (u_int8_t *)&wh[1]; 804 efrm = mtod(m, u_int8_t *) + m->m_len; 805 IEEE80211_VERIFY_LENGTH(efrm - frm, 806 sizeof(struct ieee80211_action), return EINVAL); 807 ia = (const struct ieee80211_action *) frm; 808 809 vap->iv_stats.is_rx_action++; 810 IEEE80211_NODE_STAT(ni, rx_action); 811 812 /* verify frame payloads but defer processing */ 813 switch (ia->ia_category) { 814 case IEEE80211_ACTION_CAT_BA: 815 switch (ia->ia_action) { 816 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 817 IEEE80211_VERIFY_LENGTH(efrm - frm, 818 sizeof(struct ieee80211_action_ba_addbarequest), 819 return EINVAL); 820 break; 821 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 822 IEEE80211_VERIFY_LENGTH(efrm - frm, 823 sizeof(struct ieee80211_action_ba_addbaresponse), 824 return EINVAL); 825 break; 826 case IEEE80211_ACTION_BA_DELBA: 827 IEEE80211_VERIFY_LENGTH(efrm - frm, 828 sizeof(struct ieee80211_action_ba_delba), 829 return EINVAL); 830 break; 831 } 832 break; 833 case IEEE80211_ACTION_CAT_HT: 834 switch (ia->ia_action) { 835 case IEEE80211_ACTION_HT_TXCHWIDTH: 836 IEEE80211_VERIFY_LENGTH(efrm - frm, 837 sizeof(struct ieee80211_action_ht_txchwidth), 838 return EINVAL); 839 break; 840 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 841 IEEE80211_VERIFY_LENGTH(efrm - frm, 842 sizeof(struct ieee80211_action_ht_mimopowersave), 843 return EINVAL); 844 break; 845 } 846 break; 847 #ifdef IEEE80211_SUPPORT_MESH 848 case IEEE80211_ACTION_CAT_MESH: 849 switch (ia->ia_action) { 850 case IEEE80211_ACTION_MESH_LMETRIC: 851 /* 852 * XXX: verification is true only if we are using 853 * Airtime link metric (default) 854 */ 855 IEEE80211_VERIFY_LENGTH(efrm - frm, 856 sizeof(struct ieee80211_meshlmetric_ie), 857 return EINVAL); 858 break; 859 case IEEE80211_ACTION_MESH_HWMP: 860 /* verify something */ 861 break; 862 case IEEE80211_ACTION_MESH_GANN: 863 IEEE80211_VERIFY_LENGTH(efrm - frm, 864 sizeof(struct ieee80211_meshgann_ie), 865 return EINVAL); 866 break; 867 case IEEE80211_ACTION_MESH_CC: 868 case IEEE80211_ACTION_MESH_MCCA_SREQ: 869 case IEEE80211_ACTION_MESH_MCCA_SREP: 870 case IEEE80211_ACTION_MESH_MCCA_AREQ: 871 case IEEE80211_ACTION_MESH_MCCA_ADVER: 872 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 873 case IEEE80211_ACTION_MESH_TBTT_REQ: 874 case IEEE80211_ACTION_MESH_TBTT_RES: 875 /* reject these early on, not implemented */ 876 IEEE80211_DISCARD(vap, 877 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 878 wh, NULL, "not implemented yet, act=0x%02X", 879 ia->ia_action); 880 return EINVAL; 881 } 882 break; 883 case IEEE80211_ACTION_CAT_SELF_PROT: 884 /* If TA or RA group address discard silently */ 885 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 886 IEEE80211_IS_MULTICAST(wh->i_addr2)) 887 return EINVAL; 888 /* 889 * XXX: Should we verify complete length now or it is 890 * to varying in sizes? 891 */ 892 switch (ia->ia_action) { 893 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 894 case IEEE80211_ACTION_MESHPEERING_CLOSE: 895 /* is not a peering candidate (yet) */ 896 if (ni == vap->iv_bss) 897 return EINVAL; 898 break; 899 } 900 break; 901 #endif 902 case IEEE80211_ACTION_CAT_VHT: 903 printf("%s: TODO: VHT handling!\n", __func__); 904 break; 905 } 906 return 0; 907 } 908 909 #ifdef IEEE80211_DEBUG 910 /* 911 * Debugging support. 912 */ 913 void 914 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 915 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 916 { 917 printf("[%s] discard %s frame, ssid mismatch: ", 918 ether_sprintf(mac), tag); 919 ieee80211_print_essid(ssid + 2, ssid[1]); 920 printf("\n"); 921 } 922 923 /* 924 * Return the bssid of a frame. 925 */ 926 static const uint8_t * 927 ieee80211_getbssid(const struct ieee80211vap *vap, 928 const struct ieee80211_frame *wh) 929 { 930 if (vap->iv_opmode == IEEE80211_M_STA) 931 return wh->i_addr2; 932 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 933 return wh->i_addr1; 934 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 935 return wh->i_addr1; 936 return wh->i_addr3; 937 } 938 939 #include <machine/stdarg.h> 940 941 void 942 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 943 { 944 char buf[256]; /* XXX */ 945 va_list ap; 946 int len; 947 948 va_start(ap, fmt); 949 len = vsnprintf(buf, sizeof(buf), fmt, ap); 950 va_end(ap); 951 952 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 953 954 if (len >= sizeof(buf)) 955 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 956 } 957 958 void 959 ieee80211_note_frame(const struct ieee80211vap *vap, 960 const struct ieee80211_frame *wh, 961 const char *fmt, ...) 962 { 963 char buf[256]; /* XXX */ 964 va_list ap; 965 int len; 966 967 va_start(ap, fmt); 968 len = vsnprintf(buf, sizeof(buf), fmt, ap); 969 va_end(ap); 970 if_printf(vap->iv_ifp, "[%s] %s\n", 971 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 972 973 if (len >= sizeof(buf)) 974 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 975 } 976 977 void 978 ieee80211_note_mac(const struct ieee80211vap *vap, 979 const uint8_t mac[IEEE80211_ADDR_LEN], 980 const char *fmt, ...) 981 { 982 char buf[256]; /* XXX */ 983 va_list ap; 984 int len; 985 986 va_start(ap, fmt); 987 len = vsnprintf(buf, sizeof(buf), fmt, ap); 988 va_end(ap); 989 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 990 991 if (len >= sizeof(buf)) 992 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 993 } 994 995 void 996 ieee80211_discard_frame(const struct ieee80211vap *vap, 997 const struct ieee80211_frame *wh, 998 const char *type, const char *fmt, ...) 999 { 1000 char buf[256]; /* XXX */ 1001 va_list ap; 1002 int len; 1003 1004 va_start(ap, fmt); 1005 len = vsnprintf(buf, sizeof(buf), fmt, ap); 1006 va_end(ap); 1007 1008 if_printf(vap->iv_ifp, "[%s] discard %s frame, %s\n", 1009 ether_sprintf(ieee80211_getbssid(vap, wh)), 1010 type != NULL ? type : ieee80211_mgt_subtype_name(wh->i_fc[0]), 1011 buf); 1012 1013 if (len >= sizeof(buf)) 1014 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 1015 } 1016 1017 void 1018 ieee80211_discard_ie(const struct ieee80211vap *vap, 1019 const struct ieee80211_frame *wh, 1020 const char *type, const char *fmt, ...) 1021 { 1022 char buf[256]; /* XXX */ 1023 va_list ap; 1024 int len; 1025 1026 va_start(ap, fmt); 1027 len = vsnprintf(buf, sizeof(buf), fmt, ap); 1028 va_end(ap); 1029 1030 if_printf(vap->iv_ifp, "[%s] discard%s%s information element, %s\n", 1031 ether_sprintf(ieee80211_getbssid(vap, wh)), 1032 type != NULL ? " " : "", type != NULL ? type : "", buf); 1033 1034 if (len >= sizeof(buf)) 1035 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 1036 } 1037 1038 void 1039 ieee80211_discard_mac(const struct ieee80211vap *vap, 1040 const uint8_t mac[IEEE80211_ADDR_LEN], 1041 const char *type, const char *fmt, ...) 1042 { 1043 char buf[256]; /* XXX */ 1044 va_list ap; 1045 int len; 1046 1047 va_start(ap, fmt); 1048 len = vsnprintf(buf, sizeof(buf), fmt, ap); 1049 va_end(ap); 1050 1051 if_printf(vap->iv_ifp, "[%s] discard%s%s frame, %s\n", 1052 ether_sprintf(mac), 1053 type != NULL ? " " : "", type != NULL ? type : "", buf); 1054 1055 if (len >= sizeof(buf)) 1056 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 1057 } 1058 #endif /* IEEE80211_DEBUG */ 1059