1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 __FBSDID("$FreeBSD$"); 31 32 #include "opt_wlan.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/mbuf.h> 37 #include <sys/malloc.h> 38 #include <sys/endian.h> 39 #include <sys/kernel.h> 40 41 #include <sys/socket.h> 42 43 #include <net/ethernet.h> 44 #include <net/if.h> 45 #include <net/if_var.h> 46 #include <net/if_llc.h> 47 #include <net/if_media.h> 48 #include <net/if_private.h> 49 #include <net/if_vlan_var.h> 50 51 #include <net80211/ieee80211_var.h> 52 #include <net80211/ieee80211_input.h> 53 #ifdef IEEE80211_SUPPORT_MESH 54 #include <net80211/ieee80211_mesh.h> 55 #endif 56 57 #include <net/bpf.h> 58 59 #ifdef INET 60 #include <netinet/in.h> 61 #include <net/ethernet.h> 62 #endif 63 64 static void 65 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx) 66 { 67 int i; 68 69 /* Verify the required MIMO bits are set */ 70 if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) != 71 (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) 72 return; 73 74 /* XXX This assumes the MIMO radios have both ctl and ext chains */ 75 for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) { 76 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]); 77 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]); 78 } 79 80 /* XXX This also assumes the MIMO radios have both ctl and ext chains */ 81 for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) { 82 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i]; 83 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i]; 84 } 85 ni->ni_mimo_chains = rx->c_chain; 86 } 87 88 int 89 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m) 90 { 91 struct ieee80211_rx_stats rxs; 92 93 /* try to read stats from mbuf */ 94 bzero(&rxs, sizeof(rxs)); 95 if (ieee80211_get_rx_params(m, &rxs) != 0) 96 return (-1); 97 98 /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */ 99 ieee80211_process_mimo(ni, &rxs); 100 101 //return ieee80211_input(ni, m, rx->rssi, rx->nf); 102 return ni->ni_vap->iv_input(ni, m, &rxs, rxs.c_rssi, rxs.c_nf); 103 } 104 105 int 106 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf) 107 { 108 struct ieee80211_rx_stats rx; 109 110 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI; 111 rx.c_nf = nf; 112 rx.c_rssi = rssi; 113 114 if (!ieee80211_add_rx_params(m, &rx)) 115 return (-1); 116 117 return ieee80211_input_mimo_all(ic, m); 118 } 119 120 int 121 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m) 122 { 123 struct ieee80211vap *vap; 124 int type = -1; 125 126 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */ 127 128 /* XXX locking */ 129 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 130 struct ieee80211_node *ni; 131 struct mbuf *mcopy; 132 133 /* NB: could check for IFF_UP but this is cheaper */ 134 if (vap->iv_state == IEEE80211_S_INIT) 135 continue; 136 /* 137 * WDS vap's only receive directed traffic from the 138 * station at the ``far end''. That traffic should 139 * be passed through the AP vap the station is associated 140 * to--so don't spam them with mcast frames. 141 */ 142 if (vap->iv_opmode == IEEE80211_M_WDS) 143 continue; 144 if (TAILQ_NEXT(vap, iv_next) != NULL) { 145 /* 146 * Packet contents are changed by ieee80211_decap 147 * so do a deep copy of the packet. 148 * NB: tags are copied too. 149 */ 150 mcopy = m_dup(m, IEEE80211_M_NOWAIT); 151 if (mcopy == NULL) { 152 /* XXX stat+msg */ 153 continue; 154 } 155 } else { 156 mcopy = m; 157 m = NULL; 158 } 159 ni = ieee80211_ref_node(vap->iv_bss); 160 type = ieee80211_input_mimo(ni, mcopy); 161 ieee80211_free_node(ni); 162 } 163 if (m != NULL) /* no vaps, reclaim mbuf */ 164 m_freem(m); 165 return type; 166 } 167 168 /* 169 * This function reassembles fragments. 170 * 171 * XXX should handle 3 concurrent reassemblies per-spec. 172 */ 173 struct mbuf * 174 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace, 175 int has_decrypted) 176 { 177 struct ieee80211vap *vap = ni->ni_vap; 178 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 179 struct ieee80211_frame *lwh; 180 uint16_t rxseq; 181 uint8_t fragno; 182 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 183 struct mbuf *mfrag; 184 185 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 186 187 rxseq = le16toh(*(uint16_t *)wh->i_seq); 188 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 189 190 /* Quick way out, if there's nothing to defragment */ 191 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 192 return m; 193 194 /* Temporarily set flag to remember if fragment was encrypted. */ 195 /* XXX use a non-packet altering storage for this in the future. */ 196 if (has_decrypted) 197 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED; 198 199 /* 200 * Remove frag to insure it doesn't get reaped by timer. 201 */ 202 if (ni->ni_table == NULL) { 203 /* 204 * Should never happen. If the node is orphaned (not in 205 * the table) then input packets should not reach here. 206 * Otherwise, a concurrent request that yanks the table 207 * should be blocked by other interlocking and/or by first 208 * shutting the driver down. Regardless, be defensive 209 * here and just bail 210 */ 211 /* XXX need msg+stat */ 212 m_freem(m); 213 return NULL; 214 } 215 IEEE80211_NODE_LOCK(ni->ni_table); 216 mfrag = ni->ni_rxfrag[0]; 217 ni->ni_rxfrag[0] = NULL; 218 IEEE80211_NODE_UNLOCK(ni->ni_table); 219 220 /* 221 * Validate new fragment is in order and 222 * related to the previous ones. 223 */ 224 if (mfrag != NULL) { 225 uint16_t last_rxseq; 226 227 lwh = mtod(mfrag, struct ieee80211_frame *); 228 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 229 /* 230 * NB: check seq # and frag together. Also check that both 231 * fragments are plaintext or that both are encrypted. 232 */ 233 if (rxseq == last_rxseq+1 && 234 IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) && 235 IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2) && 236 !((wh->i_fc[1] ^ lwh->i_fc[1]) & IEEE80211_FC1_PROTECTED)) { 237 /* XXX clear MORE_FRAG bit? */ 238 /* track last seqnum and fragno */ 239 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 240 241 m_adj(m, hdrspace); /* strip header */ 242 m_catpkt(mfrag, m); /* concatenate */ 243 } else { 244 /* 245 * Unrelated fragment or no space for it, 246 * clear current fragments. 247 */ 248 m_freem(mfrag); 249 mfrag = NULL; 250 } 251 } 252 253 if (mfrag == NULL) { 254 if (fragno != 0) { /* !first fragment, discard */ 255 vap->iv_stats.is_rx_defrag++; 256 IEEE80211_NODE_STAT(ni, rx_defrag); 257 m_freem(m); 258 return NULL; 259 } 260 mfrag = m; 261 } 262 if (more_frag) { /* more to come, save */ 263 ni->ni_rxfragstamp = ticks; 264 ni->ni_rxfrag[0] = mfrag; 265 mfrag = NULL; 266 } 267 /* Remember to clear protected flag that was temporarily set. */ 268 if (mfrag != NULL) { 269 wh = mtod(mfrag, struct ieee80211_frame *); 270 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 271 } 272 return mfrag; 273 } 274 275 void 276 ieee80211_deliver_data(struct ieee80211vap *vap, 277 struct ieee80211_node *ni, struct mbuf *m) 278 { 279 struct ether_header *eh = mtod(m, struct ether_header *); 280 struct ifnet *ifp = vap->iv_ifp; 281 282 /* clear driver/net80211 flags before passing up */ 283 m->m_flags &= ~(M_MCAST | M_BCAST); 284 m_clrprotoflags(m); 285 286 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 287 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 288 /* 289 * Do accounting. 290 */ 291 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 292 IEEE80211_NODE_STAT(ni, rx_data); 293 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 294 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 295 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 296 m->m_flags |= M_BCAST; 297 else 298 m->m_flags |= M_MCAST; 299 IEEE80211_NODE_STAT(ni, rx_mcast); 300 } else 301 IEEE80211_NODE_STAT(ni, rx_ucast); 302 m->m_pkthdr.rcvif = ifp; 303 304 if (ni->ni_vlan != 0) { 305 /* attach vlan tag */ 306 m->m_pkthdr.ether_vtag = ni->ni_vlan; 307 m->m_flags |= M_VLANTAG; 308 } 309 ifp->if_input(ifp, m); 310 } 311 312 struct mbuf * 313 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen, 314 uint8_t qos) 315 { 316 struct ieee80211_qosframe_addr4 wh; 317 struct ether_header *eh; 318 struct llc *llc; 319 320 KASSERT(hdrlen <= sizeof(wh), 321 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 322 323 if (m->m_len < hdrlen + sizeof(*llc) && 324 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 325 vap->iv_stats.is_rx_tooshort++; 326 /* XXX msg */ 327 return NULL; 328 } 329 memcpy(&wh, mtod(m, caddr_t), hdrlen); 330 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 331 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 332 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 333 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 334 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 335 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 336 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX)) && 337 /* Do not want to touch A-MSDU frames. */ 338 !(qos & IEEE80211_QOS_AMSDU)) { 339 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 340 llc = NULL; 341 } else { 342 m_adj(m, hdrlen - sizeof(*eh)); 343 } 344 eh = mtod(m, struct ether_header *); 345 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 346 case IEEE80211_FC1_DIR_NODS: 347 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 348 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 349 break; 350 case IEEE80211_FC1_DIR_TODS: 351 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 352 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 353 break; 354 case IEEE80211_FC1_DIR_FROMDS: 355 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 356 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 357 break; 358 case IEEE80211_FC1_DIR_DSTODS: 359 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 360 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 361 break; 362 } 363 #ifndef __NO_STRICT_ALIGNMENT 364 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 365 m = ieee80211_realign(vap, m, sizeof(*eh)); 366 if (m == NULL) 367 return NULL; 368 } 369 #endif /* !__NO_STRICT_ALIGNMENT */ 370 if (llc != NULL) { 371 eh = mtod(m, struct ether_header *); 372 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 373 } 374 return m; 375 } 376 377 /* 378 * Decap a frame encapsulated in a fast-frame/A-MSDU. 379 */ 380 struct mbuf * 381 ieee80211_decap1(struct mbuf *m, int *framelen) 382 { 383 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 384 struct ether_header *eh; 385 struct llc *llc; 386 const uint8_t llc_hdr_mac[ETHER_ADDR_LEN] = { 387 /* MAC address matching the 802.2 LLC header */ 388 LLC_SNAP_LSAP, LLC_SNAP_LSAP, LLC_UI, 0, 0, 0 389 }; 390 391 /* 392 * The frame has an 802.3 header followed by an 802.2 393 * LLC header. The encapsulated frame length is in the 394 * first header type field; save that and overwrite it 395 * with the true type field found in the second. Then 396 * copy the 802.3 header up to where it belongs and 397 * adjust the mbuf contents to remove the void. 398 */ 399 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 400 return NULL; 401 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 402 403 /* 404 * Detect possible attack where a single 802.11 frame is processed 405 * as an A-MSDU frame due to an adversary setting the A-MSDU present 406 * bit in the 802.11 QoS header. [FragAttacks] 407 */ 408 if (memcmp(eh->ether_dhost, llc_hdr_mac, ETHER_ADDR_LEN) == 0) 409 return NULL; 410 411 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 412 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 413 + sizeof(struct ether_header) - sizeof(struct llc); 414 eh->ether_type = llc->llc_un.type_snap.ether_type; 415 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 416 sizeof(struct ether_header)); 417 m_adj(m, sizeof(struct llc)); 418 return m; 419 #undef FF_LLC_SIZE 420 } 421 422 /* 423 * Install received rate set information in the node's state block. 424 */ 425 int 426 ieee80211_setup_rates(struct ieee80211_node *ni, 427 const uint8_t *rates, const uint8_t *xrates, int flags) 428 { 429 struct ieee80211vap *vap = ni->ni_vap; 430 struct ieee80211_rateset *rs = &ni->ni_rates; 431 432 memset(rs, 0, sizeof(*rs)); 433 rs->rs_nrates = rates[1]; 434 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 435 if (xrates != NULL) { 436 uint8_t nxrates; 437 /* 438 * Tack on 11g extended supported rate element. 439 */ 440 nxrates = xrates[1]; 441 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 442 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 443 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 444 "extended rate set too large; only using " 445 "%u of %u rates", nxrates, xrates[1]); 446 vap->iv_stats.is_rx_rstoobig++; 447 } 448 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 449 rs->rs_nrates += nxrates; 450 } 451 return ieee80211_fix_rate(ni, rs, flags); 452 } 453 454 /* 455 * Send a management frame error response to the specified 456 * station. If ni is associated with the station then use 457 * it; otherwise allocate a temporary node suitable for 458 * transmitting the frame and then free the reference so 459 * it will go away as soon as the frame has been transmitted. 460 */ 461 void 462 ieee80211_send_error(struct ieee80211_node *ni, 463 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 464 { 465 struct ieee80211vap *vap = ni->ni_vap; 466 int istmp; 467 468 if (ni == vap->iv_bss) { 469 if (vap->iv_state != IEEE80211_S_RUN) { 470 /* 471 * XXX hack until we get rid of this routine. 472 * We can be called prior to the vap reaching 473 * run state under certain conditions in which 474 * case iv_bss->ni_chan will not be setup. 475 * Check for this explicitly and and just ignore 476 * the request. 477 */ 478 return; 479 } 480 ni = ieee80211_tmp_node(vap, mac); 481 if (ni == NULL) { 482 /* XXX msg */ 483 return; 484 } 485 istmp = 1; 486 } else 487 istmp = 0; 488 IEEE80211_SEND_MGMT(ni, subtype, arg); 489 if (istmp) 490 ieee80211_free_node(ni); 491 } 492 493 int 494 ieee80211_alloc_challenge(struct ieee80211_node *ni) 495 { 496 if (ni->ni_challenge == NULL) 497 ni->ni_challenge = (uint32_t *) 498 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN, 499 M_80211_NODE, IEEE80211_M_NOWAIT); 500 if (ni->ni_challenge == NULL) { 501 IEEE80211_NOTE(ni->ni_vap, 502 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 503 "%s", "shared key challenge alloc failed"); 504 /* XXX statistic */ 505 } 506 return (ni->ni_challenge != NULL); 507 } 508 509 /* 510 * Parse a Beacon or ProbeResponse frame and return the 511 * useful information in an ieee80211_scanparams structure. 512 * Status is set to 0 if no problems were found; otherwise 513 * a bitmask of IEEE80211_BPARSE_* items is returned that 514 * describes the problems detected. 515 */ 516 int 517 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 518 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan) 519 { 520 struct ieee80211vap *vap = ni->ni_vap; 521 struct ieee80211com *ic = ni->ni_ic; 522 struct ieee80211_frame *wh; 523 uint8_t *frm, *efrm; 524 525 wh = mtod(m, struct ieee80211_frame *); 526 frm = (uint8_t *)&wh[1]; 527 efrm = mtod(m, uint8_t *) + m->m_len; 528 scan->status = 0; 529 /* 530 * beacon/probe response frame format 531 * 532 * XXX Update from 802.11-2012 - eg where HT is 533 * [8] time stamp 534 * [2] beacon interval 535 * [2] capability information 536 * [tlv] ssid 537 * [tlv] supported rates 538 * [tlv] country information 539 * [tlv] channel switch announcement (CSA) 540 * [tlv] parameter set (FH/DS) 541 * [tlv] erp information 542 * [tlv] extended supported rates 543 * [tlv] WME 544 * [tlv] WPA or RSN 545 * [tlv] HT capabilities 546 * [tlv] HT information 547 * [tlv] VHT capabilities 548 * [tlv] VHT information 549 * [tlv] Atheros capabilities 550 * [tlv] Mesh ID 551 * [tlv] Mesh Configuration 552 */ 553 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 554 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 555 memset(scan, 0, sizeof(*scan)); 556 scan->tstamp = frm; frm += 8; 557 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 558 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 559 scan->bchan = ieee80211_chan2ieee(ic, rxchan); 560 scan->chan = scan->bchan; 561 scan->ies = frm; 562 scan->ies_len = efrm - frm; 563 564 while (efrm - frm > 1) { 565 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 566 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 567 switch (*frm) { 568 case IEEE80211_ELEMID_SSID: 569 scan->ssid = frm; 570 break; 571 case IEEE80211_ELEMID_RATES: 572 scan->rates = frm; 573 break; 574 case IEEE80211_ELEMID_COUNTRY: 575 scan->country = frm; 576 break; 577 case IEEE80211_ELEMID_CSA: 578 scan->csa = frm; 579 break; 580 case IEEE80211_ELEMID_QUIET: 581 scan->quiet = frm; 582 break; 583 case IEEE80211_ELEMID_FHPARMS: 584 if (ic->ic_phytype == IEEE80211_T_FH) { 585 scan->fhdwell = le16dec(&frm[2]); 586 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 587 scan->fhindex = frm[6]; 588 } 589 break; 590 case IEEE80211_ELEMID_DSPARMS: 591 /* 592 * XXX hack this since depending on phytype 593 * is problematic for multi-mode devices. 594 */ 595 if (ic->ic_phytype != IEEE80211_T_FH) 596 scan->chan = frm[2]; 597 break; 598 case IEEE80211_ELEMID_TIM: 599 /* XXX ATIM? */ 600 scan->tim = frm; 601 scan->timoff = frm - mtod(m, uint8_t *); 602 break; 603 case IEEE80211_ELEMID_IBSSPARMS: 604 case IEEE80211_ELEMID_CFPARMS: 605 case IEEE80211_ELEMID_PWRCNSTR: 606 case IEEE80211_ELEMID_BSSLOAD: 607 case IEEE80211_ELEMID_APCHANREP: 608 /* NB: avoid debugging complaints */ 609 break; 610 case IEEE80211_ELEMID_XRATES: 611 scan->xrates = frm; 612 break; 613 case IEEE80211_ELEMID_ERP: 614 if (frm[1] != 1) { 615 IEEE80211_DISCARD_IE(vap, 616 IEEE80211_MSG_ELEMID, wh, "ERP", 617 "bad len %u", frm[1]); 618 vap->iv_stats.is_rx_elem_toobig++; 619 break; 620 } 621 scan->erp = frm[2] | 0x100; 622 break; 623 case IEEE80211_ELEMID_HTCAP: 624 scan->htcap = frm; 625 break; 626 case IEEE80211_ELEMID_VHT_CAP: 627 scan->vhtcap = frm; 628 break; 629 case IEEE80211_ELEMID_VHT_OPMODE: 630 scan->vhtopmode = frm; 631 break; 632 case IEEE80211_ELEMID_RSN: 633 scan->rsn = frm; 634 break; 635 case IEEE80211_ELEMID_HTINFO: 636 scan->htinfo = frm; 637 break; 638 #ifdef IEEE80211_SUPPORT_MESH 639 case IEEE80211_ELEMID_MESHID: 640 scan->meshid = frm; 641 break; 642 case IEEE80211_ELEMID_MESHCONF: 643 scan->meshconf = frm; 644 break; 645 #endif 646 /* Extended capabilities; nothing handles it for now */ 647 case IEEE80211_ELEMID_EXTCAP: 648 break; 649 case IEEE80211_ELEMID_VENDOR: 650 if (iswpaoui(frm)) 651 scan->wpa = frm; 652 else if (iswmeparam(frm) || iswmeinfo(frm)) 653 scan->wme = frm; 654 #ifdef IEEE80211_SUPPORT_SUPERG 655 else if (isatherosoui(frm)) 656 scan->ath = frm; 657 #endif 658 #ifdef IEEE80211_SUPPORT_TDMA 659 else if (istdmaoui(frm)) 660 scan->tdma = frm; 661 #endif 662 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 663 /* 664 * Accept pre-draft HT ie's if the 665 * standard ones have not been seen. 666 */ 667 if (ishtcapoui(frm)) { 668 if (scan->htcap == NULL) 669 scan->htcap = frm; 670 } else if (ishtinfooui(frm)) { 671 if (scan->htinfo == NULL) 672 scan->htcap = frm; 673 } 674 } 675 break; 676 default: 677 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 678 wh, "unhandled", 679 "id %u, len %u", *frm, frm[1]); 680 vap->iv_stats.is_rx_elem_unknown++; 681 break; 682 } 683 frm += frm[1] + 2; 684 } 685 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 686 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 687 if (scan->rates != NULL && scan->xrates != NULL) { 688 /* 689 * NB: don't process XRATES if RATES is missing. This 690 * avoids a potential null ptr deref and should be ok 691 * as the return code will already note RATES is missing 692 * (so callers shouldn't otherwise process the frame). 693 */ 694 IEEE80211_VERIFY_ELEMENT(scan->xrates, 695 IEEE80211_RATE_MAXSIZE - scan->rates[1], 696 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 697 } 698 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 699 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 700 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 701 /* 702 * Frame was received on a channel different from the 703 * one indicated in the DS params element id; 704 * silently discard it. 705 * 706 * NB: this can happen due to signal leakage. 707 * But we should take it for FH phy because 708 * the rssi value should be correct even for 709 * different hop pattern in FH. 710 */ 711 IEEE80211_DISCARD(vap, 712 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 713 wh, NULL, "for off-channel %u (bchan=%u)", 714 scan->chan, scan->bchan); 715 vap->iv_stats.is_rx_chanmismatch++; 716 scan->status |= IEEE80211_BPARSE_OFFCHAN; 717 } 718 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 719 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 720 IEEE80211_DISCARD(vap, 721 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 722 wh, NULL, "bogus beacon interval (%d TU)", 723 (int) scan->bintval); 724 vap->iv_stats.is_rx_badbintval++; 725 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 726 } 727 if (scan->country != NULL) { 728 /* 729 * Validate we have at least enough data to extract 730 * the country code. Not sure if we should return an 731 * error instead of discarding the IE; consider this 732 * being lenient as we don't depend on the data for 733 * correct operation. 734 */ 735 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 736 scan->country = NULL); 737 } 738 if (scan->csa != NULL) { 739 /* 740 * Validate Channel Switch Announcement; this must 741 * be the correct length or we toss the frame. 742 */ 743 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 744 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 745 } 746 #ifdef IEEE80211_SUPPORT_MESH 747 if (scan->meshid != NULL) { 748 IEEE80211_VERIFY_ELEMENT(scan->meshid, IEEE80211_MESHID_LEN, 749 scan->status |= IEEE80211_BPARSE_MESHID_INVALID); 750 } 751 #endif 752 /* 753 * Process HT ie's. This is complicated by our 754 * accepting both the standard ie's and the pre-draft 755 * vendor OUI ie's that some vendors still use/require. 756 */ 757 if (scan->htcap != NULL) { 758 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 759 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 760 4 + sizeof(struct ieee80211_ie_htcap)-2 : 761 sizeof(struct ieee80211_ie_htcap)-2, 762 scan->htcap = NULL); 763 } 764 if (scan->htinfo != NULL) { 765 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 766 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 767 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 768 sizeof(struct ieee80211_ie_htinfo)-2, 769 scan->htinfo = NULL); 770 } 771 772 /* Process VHT IEs */ 773 if (scan->vhtcap != NULL) { 774 IEEE80211_VERIFY_LENGTH(scan->vhtcap[1], 775 sizeof(struct ieee80211_ie_vhtcap) - 2, 776 scan->vhtcap = NULL); 777 } 778 if (scan->vhtopmode != NULL) { 779 IEEE80211_VERIFY_LENGTH(scan->vhtopmode[1], 780 sizeof(struct ieee80211_ie_vht_operation) - 2, 781 scan->vhtopmode = NULL); 782 } 783 784 return scan->status; 785 } 786 787 /* 788 * Parse an Action frame. Return 0 on success, non-zero on failure. 789 */ 790 int 791 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 792 { 793 struct ieee80211vap *vap = ni->ni_vap; 794 const struct ieee80211_action *ia; 795 struct ieee80211_frame *wh; 796 uint8_t *frm, *efrm; 797 798 /* 799 * action frame format: 800 * [1] category 801 * [1] action 802 * [tlv] parameters 803 */ 804 wh = mtod(m, struct ieee80211_frame *); 805 frm = (u_int8_t *)&wh[1]; 806 efrm = mtod(m, u_int8_t *) + m->m_len; 807 IEEE80211_VERIFY_LENGTH(efrm - frm, 808 sizeof(struct ieee80211_action), return EINVAL); 809 ia = (const struct ieee80211_action *) frm; 810 811 vap->iv_stats.is_rx_action++; 812 IEEE80211_NODE_STAT(ni, rx_action); 813 814 /* verify frame payloads but defer processing */ 815 switch (ia->ia_category) { 816 case IEEE80211_ACTION_CAT_BA: 817 switch (ia->ia_action) { 818 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 819 IEEE80211_VERIFY_LENGTH(efrm - frm, 820 sizeof(struct ieee80211_action_ba_addbarequest), 821 return EINVAL); 822 break; 823 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 824 IEEE80211_VERIFY_LENGTH(efrm - frm, 825 sizeof(struct ieee80211_action_ba_addbaresponse), 826 return EINVAL); 827 break; 828 case IEEE80211_ACTION_BA_DELBA: 829 IEEE80211_VERIFY_LENGTH(efrm - frm, 830 sizeof(struct ieee80211_action_ba_delba), 831 return EINVAL); 832 break; 833 } 834 break; 835 case IEEE80211_ACTION_CAT_HT: 836 switch (ia->ia_action) { 837 case IEEE80211_ACTION_HT_TXCHWIDTH: 838 IEEE80211_VERIFY_LENGTH(efrm - frm, 839 sizeof(struct ieee80211_action_ht_txchwidth), 840 return EINVAL); 841 break; 842 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 843 IEEE80211_VERIFY_LENGTH(efrm - frm, 844 sizeof(struct ieee80211_action_ht_mimopowersave), 845 return EINVAL); 846 break; 847 } 848 break; 849 #ifdef IEEE80211_SUPPORT_MESH 850 case IEEE80211_ACTION_CAT_MESH: 851 switch (ia->ia_action) { 852 case IEEE80211_ACTION_MESH_LMETRIC: 853 /* 854 * XXX: verification is true only if we are using 855 * Airtime link metric (default) 856 */ 857 IEEE80211_VERIFY_LENGTH(efrm - frm, 858 sizeof(struct ieee80211_meshlmetric_ie), 859 return EINVAL); 860 break; 861 case IEEE80211_ACTION_MESH_HWMP: 862 /* verify something */ 863 break; 864 case IEEE80211_ACTION_MESH_GANN: 865 IEEE80211_VERIFY_LENGTH(efrm - frm, 866 sizeof(struct ieee80211_meshgann_ie), 867 return EINVAL); 868 break; 869 case IEEE80211_ACTION_MESH_CC: 870 case IEEE80211_ACTION_MESH_MCCA_SREQ: 871 case IEEE80211_ACTION_MESH_MCCA_SREP: 872 case IEEE80211_ACTION_MESH_MCCA_AREQ: 873 case IEEE80211_ACTION_MESH_MCCA_ADVER: 874 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 875 case IEEE80211_ACTION_MESH_TBTT_REQ: 876 case IEEE80211_ACTION_MESH_TBTT_RES: 877 /* reject these early on, not implemented */ 878 IEEE80211_DISCARD(vap, 879 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 880 wh, NULL, "not implemented yet, act=0x%02X", 881 ia->ia_action); 882 return EINVAL; 883 } 884 break; 885 case IEEE80211_ACTION_CAT_SELF_PROT: 886 /* If TA or RA group address discard silently */ 887 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 888 IEEE80211_IS_MULTICAST(wh->i_addr2)) 889 return EINVAL; 890 /* 891 * XXX: Should we verify complete length now or it is 892 * to varying in sizes? 893 */ 894 switch (ia->ia_action) { 895 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 896 case IEEE80211_ACTION_MESHPEERING_CLOSE: 897 /* is not a peering candidate (yet) */ 898 if (ni == vap->iv_bss) 899 return EINVAL; 900 break; 901 } 902 break; 903 #endif 904 case IEEE80211_ACTION_CAT_VHT: 905 printf("%s: TODO: VHT handling!\n", __func__); 906 break; 907 } 908 return 0; 909 } 910 911 #ifdef IEEE80211_DEBUG 912 /* 913 * Debugging support. 914 */ 915 void 916 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 917 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 918 { 919 printf("[%s] discard %s frame, ssid mismatch: ", 920 ether_sprintf(mac), tag); 921 ieee80211_print_essid(ssid + 2, ssid[1]); 922 printf("\n"); 923 } 924 925 /* 926 * Return the bssid of a frame. 927 */ 928 static const uint8_t * 929 ieee80211_getbssid(const struct ieee80211vap *vap, 930 const struct ieee80211_frame *wh) 931 { 932 if (vap->iv_opmode == IEEE80211_M_STA) 933 return wh->i_addr2; 934 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 935 return wh->i_addr1; 936 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 937 return wh->i_addr1; 938 return wh->i_addr3; 939 } 940 941 #include <machine/stdarg.h> 942 943 void 944 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 945 { 946 char buf[256]; /* XXX */ 947 va_list ap; 948 int len; 949 950 va_start(ap, fmt); 951 len = vsnprintf(buf, sizeof(buf), fmt, ap); 952 va_end(ap); 953 954 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 955 956 if (len >= sizeof(buf)) 957 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 958 } 959 960 void 961 ieee80211_note_frame(const struct ieee80211vap *vap, 962 const struct ieee80211_frame *wh, 963 const char *fmt, ...) 964 { 965 char buf[256]; /* XXX */ 966 va_list ap; 967 int len; 968 969 va_start(ap, fmt); 970 len = vsnprintf(buf, sizeof(buf), fmt, ap); 971 va_end(ap); 972 if_printf(vap->iv_ifp, "[%s] %s\n", 973 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 974 975 if (len >= sizeof(buf)) 976 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 977 } 978 979 void 980 ieee80211_note_mac(const struct ieee80211vap *vap, 981 const uint8_t mac[IEEE80211_ADDR_LEN], 982 const char *fmt, ...) 983 { 984 char buf[256]; /* XXX */ 985 va_list ap; 986 int len; 987 988 va_start(ap, fmt); 989 len = vsnprintf(buf, sizeof(buf), fmt, ap); 990 va_end(ap); 991 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 992 993 if (len >= sizeof(buf)) 994 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 995 } 996 997 void 998 ieee80211_discard_frame(const struct ieee80211vap *vap, 999 const struct ieee80211_frame *wh, 1000 const char *type, const char *fmt, ...) 1001 { 1002 char buf[256]; /* XXX */ 1003 va_list ap; 1004 int len; 1005 1006 va_start(ap, fmt); 1007 len = vsnprintf(buf, sizeof(buf), fmt, ap); 1008 va_end(ap); 1009 1010 if_printf(vap->iv_ifp, "[%s] discard %s frame, %s\n", 1011 ether_sprintf(ieee80211_getbssid(vap, wh)), 1012 type != NULL ? type : ieee80211_mgt_subtype_name(wh->i_fc[0]), 1013 buf); 1014 1015 if (len >= sizeof(buf)) 1016 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 1017 } 1018 1019 void 1020 ieee80211_discard_ie(const struct ieee80211vap *vap, 1021 const struct ieee80211_frame *wh, 1022 const char *type, const char *fmt, ...) 1023 { 1024 char buf[256]; /* XXX */ 1025 va_list ap; 1026 int len; 1027 1028 va_start(ap, fmt); 1029 len = vsnprintf(buf, sizeof(buf), fmt, ap); 1030 va_end(ap); 1031 1032 if_printf(vap->iv_ifp, "[%s] discard%s%s information element, %s\n", 1033 ether_sprintf(ieee80211_getbssid(vap, wh)), 1034 type != NULL ? " " : "", type != NULL ? type : "", buf); 1035 1036 if (len >= sizeof(buf)) 1037 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 1038 } 1039 1040 void 1041 ieee80211_discard_mac(const struct ieee80211vap *vap, 1042 const uint8_t mac[IEEE80211_ADDR_LEN], 1043 const char *type, const char *fmt, ...) 1044 { 1045 char buf[256]; /* XXX */ 1046 va_list ap; 1047 int len; 1048 1049 va_start(ap, fmt); 1050 len = vsnprintf(buf, sizeof(buf), fmt, ap); 1051 va_end(ap); 1052 1053 if_printf(vap->iv_ifp, "[%s] discard%s%s frame, %s\n", 1054 ether_sprintf(mac), 1055 type != NULL ? " " : "", type != NULL ? type : "", buf); 1056 1057 if (len >= sizeof(buf)) 1058 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 1059 } 1060 #endif /* IEEE80211_DEBUG */ 1061