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 62static void 63ieee80211_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 86int 87ieee80211_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 103int 104ieee80211_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 118int 119ieee80211_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 */ 171struct mbuf * 172ieee80211_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 273void 274ieee80211_deliver_data(struct ieee80211vap *vap, 275 struct ieee80211_node *ni, struct mbuf *m) 276{ 277 struct epoch_tracker et; 278 struct ether_header *eh = mtod(m, struct ether_header *); 279 struct ifnet *ifp = vap->iv_ifp; 280 281 /* clear driver/net80211 flags before passing up */ 282 m->m_flags &= ~(M_MCAST | M_BCAST); 283 m_clrprotoflags(m); 284 285 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 286 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 287 /* 288 * Do accounting. 289 */ 290 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 291 IEEE80211_NODE_STAT(ni, rx_data); 292 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 293 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 294 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 295 m->m_flags |= M_BCAST; 296 else 297 m->m_flags |= M_MCAST; 298 IEEE80211_NODE_STAT(ni, rx_mcast); 299 } else 300 IEEE80211_NODE_STAT(ni, rx_ucast); 301 m->m_pkthdr.rcvif = ifp; 302 303 if (ni->ni_vlan != 0) { 304 /* attach vlan tag */ 305 m->m_pkthdr.ether_vtag = ni->ni_vlan; 306 m->m_flags |= M_VLANTAG; 307 } 308 NET_EPOCH_ENTER(et); 309 ifp->if_input(ifp, m); 310 NET_EPOCH_EXIT(et); 311} 312 313struct mbuf * 314ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen, 315 uint8_t qos) 316{ 317 struct ieee80211_qosframe_addr4 wh; 318 struct ether_header *eh; 319 struct llc *llc; 320 321 KASSERT(hdrlen <= sizeof(wh), 322 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 323 324 if (m->m_len < hdrlen + sizeof(*llc) && 325 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 326 vap->iv_stats.is_rx_tooshort++; 327 /* XXX msg */ 328 return NULL; 329 } 330 memcpy(&wh, mtod(m, caddr_t), hdrlen); 331 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 332 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 333 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 334 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 335 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 336 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 337 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX)) && 338 /* Do not want to touch A-MSDU frames. */ 339 !(qos & IEEE80211_QOS_AMSDU)) { 340 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 341 llc = NULL; 342 } else { 343 m_adj(m, hdrlen - sizeof(*eh)); 344 } 345 eh = mtod(m, struct ether_header *); 346 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 347 case IEEE80211_FC1_DIR_NODS: 348 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 349 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 350 break; 351 case IEEE80211_FC1_DIR_TODS: 352 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 353 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 354 break; 355 case IEEE80211_FC1_DIR_FROMDS: 356 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 357 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 358 break; 359 case IEEE80211_FC1_DIR_DSTODS: 360 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 361 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 362 break; 363 } 364#ifndef __NO_STRICT_ALIGNMENT 365 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 366 m = ieee80211_realign(vap, m, sizeof(*eh)); 367 if (m == NULL) 368 return NULL; 369 } 370#endif /* !__NO_STRICT_ALIGNMENT */ 371 if (llc != NULL) { 372 eh = mtod(m, struct ether_header *); 373 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 374 } 375 return m; 376} 377 378/* 379 * Decap a frame encapsulated in a fast-frame/A-MSDU. 380 */ 381struct mbuf * 382ieee80211_decap1(struct mbuf *m, int *framelen) 383{ 384#define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 385 struct ether_header *eh; 386 struct llc *llc; 387 const uint8_t llc_hdr_mac[ETHER_ADDR_LEN] = { 388 /* MAC address matching the 802.2 LLC header */ 389 LLC_SNAP_LSAP, LLC_SNAP_LSAP, LLC_UI, 0, 0, 0 390 }; 391 392 /* 393 * The frame has an 802.3 header followed by an 802.2 394 * LLC header. The encapsulated frame length is in the 395 * first header type field; save that and overwrite it 396 * with the true type field found in the second. Then 397 * copy the 802.3 header up to where it belongs and 398 * adjust the mbuf contents to remove the void. 399 */ 400 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 401 return NULL; 402 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 403 404 /* 405 * Detect possible attack where a single 802.11 frame is processed 406 * as an A-MSDU frame due to an adversary setting the A-MSDU present 407 * bit in the 802.11 QoS header. [FragAttacks] 408 */ 409 if (memcmp(eh->ether_dhost, llc_hdr_mac, ETHER_ADDR_LEN) == 0) 410 return NULL; 411 412 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 413 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 414 + sizeof(struct ether_header) - sizeof(struct llc); 415 eh->ether_type = llc->llc_un.type_snap.ether_type; 416 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 417 sizeof(struct ether_header)); 418 m_adj(m, sizeof(struct llc)); 419 return m; 420#undef FF_LLC_SIZE 421} 422 423/* 424 * Install received rate set information in the node's state block. 425 */ 426int 427ieee80211_setup_rates(struct ieee80211_node *ni, 428 const uint8_t *rates, const uint8_t *xrates, int flags) 429{ 430 struct ieee80211vap *vap = ni->ni_vap; 431 struct ieee80211_rateset *rs = &ni->ni_rates; 432 433 memset(rs, 0, sizeof(*rs)); 434 rs->rs_nrates = rates[1]; 435 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 436 if (xrates != NULL) { 437 uint8_t nxrates; 438 /* 439 * Tack on 11g extended supported rate element. 440 */ 441 nxrates = xrates[1]; 442 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 443 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 444 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 445 "extended rate set too large; only using " 446 "%u of %u rates", nxrates, xrates[1]); 447 vap->iv_stats.is_rx_rstoobig++; 448 } 449 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 450 rs->rs_nrates += nxrates; 451 } 452 return ieee80211_fix_rate(ni, rs, flags); 453} 454 455/* 456 * Send a management frame error response to the specified 457 * station. If ni is associated with the station then use 458 * it; otherwise allocate a temporary node suitable for 459 * transmitting the frame and then free the reference so 460 * it will go away as soon as the frame has been transmitted. 461 */ 462void 463ieee80211_send_error(struct ieee80211_node *ni, 464 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 465{ 466 struct ieee80211vap *vap = ni->ni_vap; 467 int istmp; 468 469 if (ni == vap->iv_bss) { 470 if (vap->iv_state != IEEE80211_S_RUN) { 471 /* 472 * XXX hack until we get rid of this routine. 473 * We can be called prior to the vap reaching 474 * run state under certain conditions in which 475 * case iv_bss->ni_chan will not be setup. 476 * Check for this explicitly and and just ignore 477 * the request. 478 */ 479 return; 480 } 481 ni = ieee80211_tmp_node(vap, mac); 482 if (ni == NULL) { 483 /* XXX msg */ 484 return; 485 } 486 istmp = 1; 487 } else 488 istmp = 0; 489 IEEE80211_SEND_MGMT(ni, subtype, arg); 490 if (istmp) 491 ieee80211_free_node(ni); 492} 493 494int 495ieee80211_alloc_challenge(struct ieee80211_node *ni) 496{ 497 if (ni->ni_challenge == NULL) 498 ni->ni_challenge = (uint32_t *) 499 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN, 500 M_80211_NODE, IEEE80211_M_NOWAIT); 501 if (ni->ni_challenge == NULL) { 502 IEEE80211_NOTE(ni->ni_vap, 503 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 504 "%s", "shared key challenge alloc failed"); 505 /* XXX statistic */ 506 } 507 return (ni->ni_challenge != NULL); 508} 509 510/* 511 * Parse a Beacon or ProbeResponse frame and return the 512 * useful information in an ieee80211_scanparams structure. 513 * Status is set to 0 if no problems were found; otherwise 514 * a bitmask of IEEE80211_BPARSE_* items is returned that 515 * describes the problems detected. 516 */ 517int 518ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 519 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan) 520{ 521 struct ieee80211vap *vap = ni->ni_vap; 522 struct ieee80211com *ic = ni->ni_ic; 523 struct ieee80211_frame *wh; 524 uint8_t *frm, *efrm; 525 526 wh = mtod(m, struct ieee80211_frame *); 527 frm = (uint8_t *)&wh[1]; 528 efrm = mtod(m, uint8_t *) + m->m_len; 529 scan->status = 0; 530 /* 531 * beacon/probe response frame format 532 * 533 * XXX Update from 802.11-2012 - eg where HT is 534 * [8] time stamp 535 * [2] beacon interval 536 * [2] capability information 537 * [tlv] ssid 538 * [tlv] supported rates 539 * [tlv] country information 540 * [tlv] channel switch announcement (CSA) 541 * [tlv] parameter set (FH/DS) 542 * [tlv] erp information 543 * [tlv] extended supported rates 544 * [tlv] WME 545 * [tlv] WPA or RSN 546 * [tlv] HT capabilities 547 * [tlv] HT information 548 * [tlv] VHT capabilities 549 * [tlv] VHT information 550 * [tlv] Atheros capabilities 551 * [tlv] Mesh ID 552 * [tlv] Mesh Configuration 553 */ 554 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 555 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 556 memset(scan, 0, sizeof(*scan)); 557 scan->tstamp = frm; frm += 8; 558 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 559 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 560 scan->bchan = ieee80211_chan2ieee(ic, rxchan); 561 scan->chan = scan->bchan; 562 scan->ies = frm; 563 scan->ies_len = efrm - frm; 564 565 while (efrm - frm > 1) { 566 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 567 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 568 switch (*frm) { 569 case IEEE80211_ELEMID_SSID: 570 scan->ssid = frm; 571 break; 572 case IEEE80211_ELEMID_RATES: 573 scan->rates = frm; 574 break; 575 case IEEE80211_ELEMID_COUNTRY: 576 scan->country = frm; 577 break; 578 case IEEE80211_ELEMID_CSA: 579 scan->csa = frm; 580 break; 581 case IEEE80211_ELEMID_QUIET: 582 scan->quiet = frm; 583 break; 584 case IEEE80211_ELEMID_FHPARMS: 585 if (ic->ic_phytype == IEEE80211_T_FH) { 586 scan->fhdwell = le16dec(&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 case IEEE80211_ELEMID_BSSLOAD: 608 case IEEE80211_ELEMID_APCHANREP: 609 /* NB: avoid debugging complaints */ 610 break; 611 case IEEE80211_ELEMID_XRATES: 612 scan->xrates = frm; 613 break; 614 case IEEE80211_ELEMID_ERP: 615 if (frm[1] != 1) { 616 IEEE80211_DISCARD_IE(vap, 617 IEEE80211_MSG_ELEMID, wh, "ERP", 618 "bad len %u", frm[1]); 619 vap->iv_stats.is_rx_elem_toobig++; 620 break; 621 } 622 scan->erp = frm[2] | 0x100; 623 break; 624 case IEEE80211_ELEMID_HTCAP: 625 scan->htcap = frm; 626 break; 627 case IEEE80211_ELEMID_VHT_CAP: 628 scan->vhtcap = frm; 629 break; 630 case IEEE80211_ELEMID_VHT_OPMODE: 631 scan->vhtopmode = frm; 632 break; 633 case IEEE80211_ELEMID_RSN: 634 scan->rsn = frm; 635 break; 636 case IEEE80211_ELEMID_HTINFO: 637 scan->htinfo = frm; 638 break; 639#ifdef IEEE80211_SUPPORT_MESH 640 case IEEE80211_ELEMID_MESHID: 641 scan->meshid = frm; 642 break; 643 case IEEE80211_ELEMID_MESHCONF: 644 scan->meshconf = frm; 645 break; 646#endif 647 /* Extended capabilities; nothing handles it for now */ 648 case IEEE80211_ELEMID_EXTCAP: 649 break; 650 case IEEE80211_ELEMID_VENDOR: 651 if (iswpaoui(frm)) 652 scan->wpa = frm; 653 else if (iswmeparam(frm) || iswmeinfo(frm)) 654 scan->wme = frm; 655#ifdef IEEE80211_SUPPORT_SUPERG 656 else if (isatherosoui(frm)) 657 scan->ath = frm; 658#endif 659#ifdef IEEE80211_SUPPORT_TDMA 660 else if (istdmaoui(frm)) 661 scan->tdma = frm; 662#endif 663 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 664 /* 665 * Accept pre-draft HT ie's if the 666 * standard ones have not been seen. 667 */ 668 if (ishtcapoui(frm)) { 669 if (scan->htcap == NULL) 670 scan->htcap = frm; 671 } else if (ishtinfooui(frm)) { 672 if (scan->htinfo == NULL) 673 scan->htcap = frm; 674 } 675 } 676 break; 677 default: 678 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 679 wh, "unhandled", 680 "id %u, len %u", *frm, frm[1]); 681 vap->iv_stats.is_rx_elem_unknown++; 682 break; 683 } 684 frm += frm[1] + 2; 685 } 686 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 687 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 688 if (scan->rates != NULL && scan->xrates != NULL) { 689 /* 690 * NB: don't process XRATES if RATES is missing. This 691 * avoids a potential null ptr deref and should be ok 692 * as the return code will already note RATES is missing 693 * (so callers shouldn't otherwise process the frame). 694 */ 695 IEEE80211_VERIFY_ELEMENT(scan->xrates, 696 IEEE80211_RATE_MAXSIZE - scan->rates[1], 697 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 698 } 699 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 700 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 701 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 702 /* 703 * Frame was received on a channel different from the 704 * one indicated in the DS params element id; 705 * silently discard it. 706 * 707 * NB: this can happen due to signal leakage. 708 * But we should take it for FH phy because 709 * the rssi value should be correct even for 710 * different hop pattern in FH. 711 */ 712 IEEE80211_DISCARD(vap, 713 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 714 wh, NULL, "for off-channel %u (bchan=%u)", 715 scan->chan, scan->bchan); 716 vap->iv_stats.is_rx_chanmismatch++; 717 scan->status |= IEEE80211_BPARSE_OFFCHAN; 718 } 719 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 720 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 721 IEEE80211_DISCARD(vap, 722 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 723 wh, NULL, "bogus beacon interval (%d TU)", 724 (int) scan->bintval); 725 vap->iv_stats.is_rx_badbintval++; 726 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 727 } 728 if (scan->country != NULL) { 729 /* 730 * Validate we have at least enough data to extract 731 * the country code. Not sure if we should return an 732 * error instead of discarding the IE; consider this 733 * being lenient as we don't depend on the data for 734 * correct operation. 735 */ 736 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 737 scan->country = NULL); 738 } 739 if (scan->csa != NULL) { 740 /* 741 * Validate Channel Switch Announcement; this must 742 * be the correct length or we toss the frame. 743 */ 744 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 745 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 746 } 747#ifdef IEEE80211_SUPPORT_MESH 748 if (scan->meshid != NULL) { 749 IEEE80211_VERIFY_ELEMENT(scan->meshid, IEEE80211_MESHID_LEN, 750 scan->status |= IEEE80211_BPARSE_MESHID_INVALID); 751 } 752#endif 753 /* 754 * Process HT ie's. This is complicated by our 755 * accepting both the standard ie's and the pre-draft 756 * vendor OUI ie's that some vendors still use/require. 757 */ 758 if (scan->htcap != NULL) { 759 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 760 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 761 4 + sizeof(struct ieee80211_ie_htcap)-2 : 762 sizeof(struct ieee80211_ie_htcap)-2, 763 scan->htcap = NULL); 764 } 765 if (scan->htinfo != NULL) { 766 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 767 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 768 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 769 sizeof(struct ieee80211_ie_htinfo)-2, 770 scan->htinfo = NULL); 771 } 772 773 /* Process VHT IEs */ 774 if (scan->vhtcap != NULL) { 775 IEEE80211_VERIFY_LENGTH(scan->vhtcap[1], 776 sizeof(struct ieee80211_vht_cap), 777 scan->vhtcap = NULL); 778 } 779 if (scan->vhtopmode != NULL) { 780 IEEE80211_VERIFY_LENGTH(scan->vhtopmode[1], 781 sizeof(struct ieee80211_vht_operation), 782 scan->vhtopmode = NULL); 783 } 784 785 return scan->status; 786} 787 788/* 789 * Parse an Action frame. Return 0 on success, non-zero on failure. 790 */ 791int 792ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 793{ 794 struct ieee80211vap *vap = ni->ni_vap; 795 const struct ieee80211_action *ia; 796 struct ieee80211_frame *wh; 797 uint8_t *frm, *efrm; 798 799 /* 800 * action frame format: 801 * [1] category 802 * [1] action 803 * [tlv] parameters 804 */ 805 wh = mtod(m, struct ieee80211_frame *); 806 frm = (u_int8_t *)&wh[1]; 807 efrm = mtod(m, u_int8_t *) + m->m_len; 808 IEEE80211_VERIFY_LENGTH(efrm - frm, 809 sizeof(struct ieee80211_action), return EINVAL); 810 ia = (const struct ieee80211_action *) frm; 811 812 vap->iv_stats.is_rx_action++; 813 IEEE80211_NODE_STAT(ni, rx_action); 814 815 /* verify frame payloads but defer processing */ 816 switch (ia->ia_category) { 817 case IEEE80211_ACTION_CAT_BA: 818 switch (ia->ia_action) { 819 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 820 IEEE80211_VERIFY_LENGTH(efrm - frm, 821 sizeof(struct ieee80211_action_ba_addbarequest), 822 return EINVAL); 823 break; 824 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 825 IEEE80211_VERIFY_LENGTH(efrm - frm, 826 sizeof(struct ieee80211_action_ba_addbaresponse), 827 return EINVAL); 828 break; 829 case IEEE80211_ACTION_BA_DELBA: 830 IEEE80211_VERIFY_LENGTH(efrm - frm, 831 sizeof(struct ieee80211_action_ba_delba), 832 return EINVAL); 833 break; 834 } 835 break; 836 case IEEE80211_ACTION_CAT_HT: 837 switch (ia->ia_action) { 838 case IEEE80211_ACTION_HT_TXCHWIDTH: 839 IEEE80211_VERIFY_LENGTH(efrm - frm, 840 sizeof(struct ieee80211_action_ht_txchwidth), 841 return EINVAL); 842 break; 843 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 844 IEEE80211_VERIFY_LENGTH(efrm - frm, 845 sizeof(struct ieee80211_action_ht_mimopowersave), 846 return EINVAL); 847 break; 848 } 849 break; 850#ifdef IEEE80211_SUPPORT_MESH 851 case IEEE80211_ACTION_CAT_MESH: 852 switch (ia->ia_action) { 853 case IEEE80211_ACTION_MESH_LMETRIC: 854 /* 855 * XXX: verification is true only if we are using 856 * Airtime link metric (default) 857 */ 858 IEEE80211_VERIFY_LENGTH(efrm - frm, 859 sizeof(struct ieee80211_meshlmetric_ie), 860 return EINVAL); 861 break; 862 case IEEE80211_ACTION_MESH_HWMP: 863 /* verify something */ 864 break; 865 case IEEE80211_ACTION_MESH_GANN: 866 IEEE80211_VERIFY_LENGTH(efrm - frm, 867 sizeof(struct ieee80211_meshgann_ie), 868 return EINVAL); 869 break; 870 case IEEE80211_ACTION_MESH_CC: 871 case IEEE80211_ACTION_MESH_MCCA_SREQ: 872 case IEEE80211_ACTION_MESH_MCCA_SREP: 873 case IEEE80211_ACTION_MESH_MCCA_AREQ: 874 case IEEE80211_ACTION_MESH_MCCA_ADVER: 875 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 876 case IEEE80211_ACTION_MESH_TBTT_REQ: 877 case IEEE80211_ACTION_MESH_TBTT_RES: 878 /* reject these early on, not implemented */ 879 IEEE80211_DISCARD(vap, 880 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 881 wh, NULL, "not implemented yet, act=0x%02X", 882 ia->ia_action); 883 return EINVAL; 884 } 885 break; 886 case IEEE80211_ACTION_CAT_SELF_PROT: 887 /* If TA or RA group address discard silently */ 888 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 889 IEEE80211_IS_MULTICAST(wh->i_addr2)) 890 return EINVAL; 891 /* 892 * XXX: Should we verify complete length now or it is 893 * to varying in sizes? 894 */ 895 switch (ia->ia_action) { 896 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 897 case IEEE80211_ACTION_MESHPEERING_CLOSE: 898 /* is not a peering candidate (yet) */ 899 if (ni == vap->iv_bss) 900 return EINVAL; 901 break; 902 } 903 break; 904#endif 905 case IEEE80211_ACTION_CAT_VHT: 906 printf("%s: TODO: VHT handling!\n", __func__); 907 break; 908 } 909 return 0; 910} 911 912#ifdef IEEE80211_DEBUG 913/* 914 * Debugging support. 915 */ 916void 917ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 918 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 919{ 920 printf("[%s] discard %s frame, ssid mismatch: ", 921 ether_sprintf(mac), tag); 922 ieee80211_print_essid(ssid + 2, ssid[1]); 923 printf("\n"); 924} 925 926/* 927 * Return the bssid of a frame. 928 */ 929static const uint8_t * 930ieee80211_getbssid(const struct ieee80211vap *vap, 931 const struct ieee80211_frame *wh) 932{ 933 if (vap->iv_opmode == IEEE80211_M_STA) 934 return wh->i_addr2; 935 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 936 return wh->i_addr1; 937 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 938 return wh->i_addr1; 939 return wh->i_addr3; 940} 941 942#include <machine/stdarg.h> 943 944void 945ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 946{ 947 char buf[256]; /* XXX */ 948 va_list ap; 949 int len; 950 951 va_start(ap, fmt); 952 len = vsnprintf(buf, sizeof(buf), fmt, ap); 953 va_end(ap); 954 955 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 956 957 if (len >= sizeof(buf)) 958 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 959} 960 961void 962ieee80211_note_frame(const struct ieee80211vap *vap, 963 const struct ieee80211_frame *wh, 964 const char *fmt, ...) 965{ 966 char buf[256]; /* XXX */ 967 va_list ap; 968 int len; 969 970 va_start(ap, fmt); 971 len = vsnprintf(buf, sizeof(buf), fmt, ap); 972 va_end(ap); 973 if_printf(vap->iv_ifp, "[%s] %s\n", 974 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 975 976 if (len >= sizeof(buf)) 977 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 978} 979 980void 981ieee80211_note_mac(const struct ieee80211vap *vap, 982 const uint8_t mac[IEEE80211_ADDR_LEN], 983 const char *fmt, ...) 984{ 985 char buf[256]; /* XXX */ 986 va_list ap; 987 int len; 988 989 va_start(ap, fmt); 990 len = vsnprintf(buf, sizeof(buf), fmt, ap); 991 va_end(ap); 992 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 993 994 if (len >= sizeof(buf)) 995 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 996} 997 998void 999ieee80211_discard_frame(const struct ieee80211vap *vap, 1000 const struct ieee80211_frame *wh, 1001 const char *type, const char *fmt, ...) 1002{ 1003 char buf[256]; /* XXX */ 1004 va_list ap; 1005 int len; 1006 1007 va_start(ap, fmt); 1008 len = vsnprintf(buf, sizeof(buf), fmt, ap); 1009 va_end(ap); 1010 1011 if_printf(vap->iv_ifp, "[%s] discard %s frame, %s\n", 1012 ether_sprintf(ieee80211_getbssid(vap, wh)), 1013 type != NULL ? type : ieee80211_mgt_subtype_name(wh->i_fc[0]), 1014 buf); 1015 1016 if (len >= sizeof(buf)) 1017 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 1018} 1019 1020void 1021ieee80211_discard_ie(const struct ieee80211vap *vap, 1022 const struct ieee80211_frame *wh, 1023 const char *type, const char *fmt, ...) 1024{ 1025 char buf[256]; /* XXX */ 1026 va_list ap; 1027 int len; 1028 1029 va_start(ap, fmt); 1030 len = vsnprintf(buf, sizeof(buf), fmt, ap); 1031 va_end(ap); 1032 1033 if_printf(vap->iv_ifp, "[%s] discard%s%s information element, %s\n", 1034 ether_sprintf(ieee80211_getbssid(vap, wh)), 1035 type != NULL ? " " : "", type != NULL ? type : "", buf); 1036 1037 if (len >= sizeof(buf)) 1038 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 1039} 1040 1041void 1042ieee80211_discard_mac(const struct ieee80211vap *vap, 1043 const uint8_t mac[IEEE80211_ADDR_LEN], 1044 const char *type, const char *fmt, ...) 1045{ 1046 char buf[256]; /* XXX */ 1047 va_list ap; 1048 int len; 1049 1050 va_start(ap, fmt); 1051 len = vsnprintf(buf, sizeof(buf), fmt, ap); 1052 va_end(ap); 1053 1054 if_printf(vap->iv_ifp, "[%s] discard%s%s frame, %s\n", 1055 ether_sprintf(mac), 1056 type != NULL ? " " : "", type != NULL ? type : "", buf); 1057 1058 if (len >= sizeof(buf)) 1059 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 1060} 1061#endif /* IEEE80211_DEBUG */ 1062