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 #include <sys/epoch.h> 39 40 #include <sys/socket.h> 41 42 #include <net/ethernet.h> 43 #include <net/if.h> 44 #include <net/if_var.h> 45 #include <net/if_llc.h> 46 #include <net/if_media.h> 47 #include <net/if_private.h> 48 #include <net/if_vlan_var.h> 49 50 #include <net80211/ieee80211_var.h> 51 #include <net80211/ieee80211_input.h> 52 #ifdef IEEE80211_SUPPORT_MESH 53 #include <net80211/ieee80211_mesh.h> 54 #endif 55 56 #include <net/bpf.h> 57 58 #ifdef INET 59 #include <netinet/in.h> 60 #include <net/ethernet.h> 61 #endif 62 63 static void 64 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx) 65 { 66 int i; 67 68 /* Verify the required MIMO bits are set */ 69 if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) != 70 (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) 71 return; 72 73 /* XXX This assumes the MIMO radios have both ctl and ext chains */ 74 for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) { 75 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]); 76 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]); 77 } 78 79 /* XXX This also assumes the MIMO radios have both ctl and ext chains */ 80 for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) { 81 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i]; 82 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i]; 83 } 84 ni->ni_mimo_chains = rx->c_chain; 85 } 86 87 int 88 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m) 89 { 90 struct ieee80211_rx_stats rxs; 91 92 /* try to read stats from mbuf */ 93 bzero(&rxs, sizeof(rxs)); 94 if (ieee80211_get_rx_params(m, &rxs) != 0) 95 return (-1); 96 97 /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */ 98 ieee80211_process_mimo(ni, &rxs); 99 100 //return ieee80211_input(ni, m, rx->rssi, rx->nf); 101 return ni->ni_vap->iv_input(ni, m, &rxs, rxs.c_rssi, rxs.c_nf); 102 } 103 104 int 105 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf) 106 { 107 struct ieee80211_rx_stats rx; 108 109 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI; 110 rx.c_nf = nf; 111 rx.c_rssi = rssi; 112 113 if (!ieee80211_add_rx_params(m, &rx)) 114 return (-1); 115 116 return ieee80211_input_mimo_all(ic, m); 117 } 118 119 int 120 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m) 121 { 122 struct ieee80211vap *vap; 123 int type = -1; 124 125 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */ 126 127 /* XXX locking */ 128 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 129 struct ieee80211_node *ni; 130 struct mbuf *mcopy; 131 132 /* NB: could check for IFF_UP but this is cheaper */ 133 if (vap->iv_state == IEEE80211_S_INIT) 134 continue; 135 /* 136 * WDS vap's only receive directed traffic from the 137 * station at the ``far end''. That traffic should 138 * be passed through the AP vap the station is associated 139 * to--so don't spam them with mcast frames. 140 */ 141 if (vap->iv_opmode == IEEE80211_M_WDS) 142 continue; 143 if (TAILQ_NEXT(vap, iv_next) != NULL) { 144 /* 145 * Packet contents are changed by ieee80211_decap 146 * so do a deep copy of the packet. 147 * NB: tags are copied too. 148 */ 149 mcopy = m_dup(m, IEEE80211_M_NOWAIT); 150 if (mcopy == NULL) { 151 /* XXX stat+msg */ 152 continue; 153 } 154 } else { 155 mcopy = m; 156 m = NULL; 157 } 158 ni = ieee80211_ref_node(vap->iv_bss); 159 type = ieee80211_input_mimo(ni, mcopy); 160 ieee80211_free_node(ni); 161 } 162 if (m != NULL) /* no vaps, reclaim mbuf */ 163 m_freem(m); 164 return type; 165 } 166 167 /* 168 * This function reassembles fragments. 169 * 170 * XXX should handle 3 concurrent reassemblies per-spec. 171 */ 172 struct mbuf * 173 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace, 174 int has_decrypted) 175 { 176 struct ieee80211vap *vap = ni->ni_vap; 177 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 178 struct ieee80211_frame *lwh; 179 uint16_t rxseq; 180 uint8_t fragno; 181 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 182 struct mbuf *mfrag; 183 184 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 185 186 rxseq = le16toh(*(uint16_t *)wh->i_seq); 187 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 188 189 /* Quick way out, if there's nothing to defragment */ 190 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 191 return m; 192 193 /* Temporarily set flag to remember if fragment was encrypted. */ 194 /* XXX use a non-packet altering storage for this in the future. */ 195 if (has_decrypted) 196 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED; 197 198 /* 199 * Remove frag to insure it doesn't get reaped by timer. 200 */ 201 if (ni->ni_table == NULL) { 202 /* 203 * Should never happen. If the node is orphaned (not in 204 * the table) then input packets should not reach here. 205 * Otherwise, a concurrent request that yanks the table 206 * should be blocked by other interlocking and/or by first 207 * shutting the driver down. Regardless, be defensive 208 * here and just bail 209 */ 210 /* XXX need msg+stat */ 211 m_freem(m); 212 return NULL; 213 } 214 IEEE80211_NODE_LOCK(ni->ni_table); 215 mfrag = ni->ni_rxfrag[0]; 216 ni->ni_rxfrag[0] = NULL; 217 IEEE80211_NODE_UNLOCK(ni->ni_table); 218 219 /* 220 * Validate new fragment is in order and 221 * related to the previous ones. 222 */ 223 if (mfrag != NULL) { 224 uint16_t last_rxseq; 225 226 lwh = mtod(mfrag, struct ieee80211_frame *); 227 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 228 /* 229 * NB: check seq # and frag together. Also check that both 230 * fragments are plaintext or that both are encrypted. 231 */ 232 if (rxseq == last_rxseq+1 && 233 IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) && 234 IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2) && 235 !((wh->i_fc[1] ^ lwh->i_fc[1]) & IEEE80211_FC1_PROTECTED)) { 236 /* XXX clear MORE_FRAG bit? */ 237 /* track last seqnum and fragno */ 238 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 239 240 m_adj(m, hdrspace); /* strip header */ 241 m_catpkt(mfrag, m); /* concatenate */ 242 } else { 243 /* 244 * Unrelated fragment or no space for it, 245 * clear current fragments. 246 */ 247 m_freem(mfrag); 248 mfrag = NULL; 249 } 250 } 251 252 if (mfrag == NULL) { 253 if (fragno != 0) { /* !first fragment, discard */ 254 vap->iv_stats.is_rx_defrag++; 255 IEEE80211_NODE_STAT(ni, rx_defrag); 256 m_freem(m); 257 return NULL; 258 } 259 mfrag = m; 260 } 261 if (more_frag) { /* more to come, save */ 262 ni->ni_rxfragstamp = ticks; 263 ni->ni_rxfrag[0] = mfrag; 264 mfrag = NULL; 265 } 266 /* Remember to clear protected flag that was temporarily set. */ 267 if (mfrag != NULL) { 268 wh = mtod(mfrag, struct ieee80211_frame *); 269 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 270 } 271 return mfrag; 272 } 273 274 void 275 ieee80211_deliver_data(struct ieee80211vap *vap, 276 struct ieee80211_node *ni, struct mbuf *m) 277 { 278 struct epoch_tracker et; 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 NET_EPOCH_ENTER(et); 310 ifp->if_input(ifp, m); 311 NET_EPOCH_EXIT(et); 312 } 313 314 struct mbuf * 315 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen, 316 uint8_t qos) 317 { 318 struct ieee80211_qosframe_addr4 wh; 319 struct ether_header *eh; 320 struct llc *llc; 321 322 KASSERT(hdrlen <= sizeof(wh), 323 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 324 325 if (m->m_len < hdrlen + sizeof(*llc) && 326 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 327 vap->iv_stats.is_rx_tooshort++; 328 /* XXX msg */ 329 return NULL; 330 } 331 memcpy(&wh, mtod(m, caddr_t), hdrlen); 332 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 333 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 334 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 335 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 336 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 337 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 338 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX)) && 339 /* Do not want to touch A-MSDU frames. */ 340 !(qos & IEEE80211_QOS_AMSDU)) { 341 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 342 llc = NULL; 343 } else { 344 m_adj(m, hdrlen - sizeof(*eh)); 345 } 346 eh = mtod(m, struct ether_header *); 347 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 348 case IEEE80211_FC1_DIR_NODS: 349 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 350 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 351 break; 352 case IEEE80211_FC1_DIR_TODS: 353 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 354 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 355 break; 356 case IEEE80211_FC1_DIR_FROMDS: 357 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 358 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 359 break; 360 case IEEE80211_FC1_DIR_DSTODS: 361 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 362 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 363 break; 364 } 365 #ifndef __NO_STRICT_ALIGNMENT 366 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 367 m = ieee80211_realign(vap, m, sizeof(*eh)); 368 if (m == NULL) 369 return NULL; 370 } 371 #endif /* !__NO_STRICT_ALIGNMENT */ 372 if (llc != NULL) { 373 eh = mtod(m, struct ether_header *); 374 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 375 } 376 return m; 377 } 378 379 /* 380 * Decap a frame encapsulated in a fast-frame/A-MSDU. 381 */ 382 struct mbuf * 383 ieee80211_decap1(struct mbuf *m, int *framelen) 384 { 385 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 386 struct ether_header *eh; 387 struct llc *llc; 388 const uint8_t llc_hdr_mac[ETHER_ADDR_LEN] = { 389 /* MAC address matching the 802.2 LLC header */ 390 LLC_SNAP_LSAP, LLC_SNAP_LSAP, LLC_UI, 0, 0, 0 391 }; 392 393 /* 394 * The frame has an 802.3 header followed by an 802.2 395 * LLC header. The encapsulated frame length is in the 396 * first header type field; save that and overwrite it 397 * with the true type field found in the second. Then 398 * copy the 802.3 header up to where it belongs and 399 * adjust the mbuf contents to remove the void. 400 */ 401 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 402 return NULL; 403 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 404 405 /* 406 * Detect possible attack where a single 802.11 frame is processed 407 * as an A-MSDU frame due to an adversary setting the A-MSDU present 408 * bit in the 802.11 QoS header. [FragAttacks] 409 */ 410 if (memcmp(eh->ether_dhost, llc_hdr_mac, ETHER_ADDR_LEN) == 0) 411 return NULL; 412 413 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 414 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 415 + sizeof(struct ether_header) - sizeof(struct llc); 416 eh->ether_type = llc->llc_un.type_snap.ether_type; 417 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 418 sizeof(struct ether_header)); 419 m_adj(m, sizeof(struct llc)); 420 return m; 421 #undef FF_LLC_SIZE 422 } 423 424 /* 425 * Install received rate set information in the node's state block. 426 */ 427 int 428 ieee80211_setup_rates(struct ieee80211_node *ni, 429 const uint8_t *rates, const uint8_t *xrates, int flags) 430 { 431 struct ieee80211vap *vap = ni->ni_vap; 432 struct ieee80211_rateset *rs = &ni->ni_rates; 433 434 memset(rs, 0, sizeof(*rs)); 435 rs->rs_nrates = rates[1]; 436 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 437 if (xrates != NULL) { 438 uint8_t nxrates; 439 /* 440 * Tack on 11g extended supported rate element. 441 */ 442 nxrates = xrates[1]; 443 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 444 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 445 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 446 "extended rate set too large; only using " 447 "%u of %u rates", nxrates, xrates[1]); 448 vap->iv_stats.is_rx_rstoobig++; 449 } 450 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 451 rs->rs_nrates += nxrates; 452 } 453 return ieee80211_fix_rate(ni, rs, flags); 454 } 455 456 /* 457 * Send a management frame error response to the specified 458 * station. If ni is associated with the station then use 459 * it; otherwise allocate a temporary node suitable for 460 * transmitting the frame and then free the reference so 461 * it will go away as soon as the frame has been transmitted. 462 */ 463 void 464 ieee80211_send_error(struct ieee80211_node *ni, 465 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 466 { 467 struct ieee80211vap *vap = ni->ni_vap; 468 int istmp; 469 470 if (ni == vap->iv_bss) { 471 if (vap->iv_state != IEEE80211_S_RUN) { 472 /* 473 * XXX hack until we get rid of this routine. 474 * We can be called prior to the vap reaching 475 * run state under certain conditions in which 476 * case iv_bss->ni_chan will not be setup. 477 * Check for this explicitly and and just ignore 478 * the request. 479 */ 480 return; 481 } 482 ni = ieee80211_tmp_node(vap, mac); 483 if (ni == NULL) { 484 /* XXX msg */ 485 return; 486 } 487 istmp = 1; 488 } else 489 istmp = 0; 490 IEEE80211_SEND_MGMT(ni, subtype, arg); 491 if (istmp) 492 ieee80211_free_node(ni); 493 } 494 495 int 496 ieee80211_alloc_challenge(struct ieee80211_node *ni) 497 { 498 if (ni->ni_challenge == NULL) 499 ni->ni_challenge = (uint32_t *) 500 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN, 501 M_80211_NODE, IEEE80211_M_NOWAIT); 502 if (ni->ni_challenge == NULL) { 503 IEEE80211_NOTE(ni->ni_vap, 504 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 505 "%s", "shared key challenge alloc failed"); 506 /* XXX statistic */ 507 } 508 return (ni->ni_challenge != NULL); 509 } 510 511 /* 512 * Parse a Beacon or ProbeResponse frame and return the 513 * useful information in an ieee80211_scanparams structure. 514 * Status is set to 0 if no problems were found; otherwise 515 * a bitmask of IEEE80211_BPARSE_* items is returned that 516 * describes the problems detected. 517 */ 518 int 519 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 520 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan) 521 { 522 struct ieee80211vap *vap = ni->ni_vap; 523 struct ieee80211com *ic = ni->ni_ic; 524 struct ieee80211_frame *wh; 525 uint8_t *frm, *efrm; 526 527 wh = mtod(m, struct ieee80211_frame *); 528 frm = (uint8_t *)&wh[1]; 529 efrm = mtod(m, uint8_t *) + m->m_len; 530 scan->status = 0; 531 /* 532 * beacon/probe response frame format 533 * 534 * XXX Update from 802.11-2012 - eg where HT is 535 * [8] time stamp 536 * [2] beacon interval 537 * [2] capability information 538 * [tlv] ssid 539 * [tlv] supported rates 540 * [tlv] country information 541 * [tlv] channel switch announcement (CSA) 542 * [tlv] parameter set (FH/DS) 543 * [tlv] erp information 544 * [tlv] extended supported rates 545 * [tlv] WME 546 * [tlv] WPA or RSN 547 * [tlv] HT capabilities 548 * [tlv] HT information 549 * [tlv] VHT capabilities 550 * [tlv] VHT information 551 * [tlv] Atheros capabilities 552 * [tlv] Mesh ID 553 * [tlv] Mesh Configuration 554 */ 555 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 556 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 557 memset(scan, 0, sizeof(*scan)); 558 scan->tstamp = frm; frm += 8; 559 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 560 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 561 scan->bchan = ieee80211_chan2ieee(ic, rxchan); 562 scan->chan = scan->bchan; 563 scan->ies = frm; 564 scan->ies_len = efrm - frm; 565 566 while (efrm - frm > 1) { 567 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 568 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 569 switch (*frm) { 570 case IEEE80211_ELEMID_SSID: 571 scan->ssid = frm; 572 break; 573 case IEEE80211_ELEMID_RATES: 574 scan->rates = frm; 575 break; 576 case IEEE80211_ELEMID_COUNTRY: 577 scan->country = frm; 578 break; 579 case IEEE80211_ELEMID_CSA: 580 scan->csa = frm; 581 break; 582 case IEEE80211_ELEMID_QUIET: 583 scan->quiet = frm; 584 break; 585 case IEEE80211_ELEMID_FHPARMS: 586 if (ic->ic_phytype == IEEE80211_T_FH) { 587 scan->fhdwell = le16dec(&frm[2]); 588 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 589 scan->fhindex = frm[6]; 590 } 591 break; 592 case IEEE80211_ELEMID_DSPARMS: 593 /* 594 * XXX hack this since depending on phytype 595 * is problematic for multi-mode devices. 596 */ 597 if (ic->ic_phytype != IEEE80211_T_FH) 598 scan->chan = frm[2]; 599 break; 600 case IEEE80211_ELEMID_TIM: 601 /* XXX ATIM? */ 602 scan->tim = frm; 603 scan->timoff = frm - mtod(m, uint8_t *); 604 break; 605 case IEEE80211_ELEMID_IBSSPARMS: 606 case IEEE80211_ELEMID_CFPARMS: 607 case IEEE80211_ELEMID_PWRCNSTR: 608 case IEEE80211_ELEMID_BSSLOAD: 609 case IEEE80211_ELEMID_APCHANREP: 610 /* NB: avoid debugging complaints */ 611 break; 612 case IEEE80211_ELEMID_XRATES: 613 scan->xrates = frm; 614 break; 615 case IEEE80211_ELEMID_ERP: 616 if (frm[1] != 1) { 617 IEEE80211_DISCARD_IE(vap, 618 IEEE80211_MSG_ELEMID, wh, "ERP", 619 "bad len %u", frm[1]); 620 vap->iv_stats.is_rx_elem_toobig++; 621 break; 622 } 623 scan->erp = frm[2] | 0x100; 624 break; 625 case IEEE80211_ELEMID_HTCAP: 626 scan->htcap = frm; 627 break; 628 case IEEE80211_ELEMID_VHT_CAP: 629 scan->vhtcap = frm; 630 break; 631 case IEEE80211_ELEMID_VHT_OPMODE: 632 scan->vhtopmode = frm; 633 break; 634 case IEEE80211_ELEMID_RSN: 635 scan->rsn = frm; 636 break; 637 case IEEE80211_ELEMID_HTINFO: 638 scan->htinfo = frm; 639 break; 640 #ifdef IEEE80211_SUPPORT_MESH 641 case IEEE80211_ELEMID_MESHID: 642 scan->meshid = frm; 643 break; 644 case IEEE80211_ELEMID_MESHCONF: 645 scan->meshconf = frm; 646 break; 647 #endif 648 /* Extended capabilities; nothing handles it for now */ 649 case IEEE80211_ELEMID_EXTCAP: 650 break; 651 case IEEE80211_ELEMID_VENDOR: 652 if (iswpaoui(frm)) 653 scan->wpa = frm; 654 else if (iswmeparam(frm) || iswmeinfo(frm)) 655 scan->wme = frm; 656 #ifdef IEEE80211_SUPPORT_SUPERG 657 else if (isatherosoui(frm)) 658 scan->ath = frm; 659 #endif 660 #ifdef IEEE80211_SUPPORT_TDMA 661 else if (istdmaoui(frm)) 662 scan->tdma = frm; 663 #endif 664 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 665 /* 666 * Accept pre-draft HT ie's if the 667 * standard ones have not been seen. 668 */ 669 if (ishtcapoui(frm)) { 670 if (scan->htcap == NULL) 671 scan->htcap = frm; 672 } else if (ishtinfooui(frm)) { 673 if (scan->htinfo == NULL) 674 scan->htcap = frm; 675 } 676 } 677 break; 678 default: 679 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 680 wh, "unhandled", 681 "id %u, len %u", *frm, frm[1]); 682 vap->iv_stats.is_rx_elem_unknown++; 683 break; 684 } 685 frm += frm[1] + 2; 686 } 687 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 688 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 689 if (scan->rates != NULL && scan->xrates != NULL) { 690 /* 691 * NB: don't process XRATES if RATES is missing. This 692 * avoids a potential null ptr deref and should be ok 693 * as the return code will already note RATES is missing 694 * (so callers shouldn't otherwise process the frame). 695 */ 696 IEEE80211_VERIFY_ELEMENT(scan->xrates, 697 IEEE80211_RATE_MAXSIZE - scan->rates[1], 698 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 699 } 700 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 701 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 702 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 703 /* 704 * Frame was received on a channel different from the 705 * one indicated in the DS params element id; 706 * silently discard it. 707 * 708 * NB: this can happen due to signal leakage. 709 * But we should take it for FH phy because 710 * the rssi value should be correct even for 711 * different hop pattern in FH. 712 */ 713 IEEE80211_DISCARD(vap, 714 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 715 wh, NULL, "for off-channel %u (bchan=%u)", 716 scan->chan, scan->bchan); 717 vap->iv_stats.is_rx_chanmismatch++; 718 scan->status |= IEEE80211_BPARSE_OFFCHAN; 719 } 720 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 721 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 722 IEEE80211_DISCARD(vap, 723 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 724 wh, NULL, "bogus beacon interval (%d TU)", 725 (int) scan->bintval); 726 vap->iv_stats.is_rx_badbintval++; 727 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 728 } 729 if (scan->country != NULL) { 730 /* 731 * Validate we have at least enough data to extract 732 * the country code. Not sure if we should return an 733 * error instead of discarding the IE; consider this 734 * being lenient as we don't depend on the data for 735 * correct operation. 736 */ 737 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 738 scan->country = NULL); 739 } 740 if (scan->csa != NULL) { 741 /* 742 * Validate Channel Switch Announcement; this must 743 * be the correct length or we toss the frame. 744 */ 745 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 746 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 747 } 748 #ifdef IEEE80211_SUPPORT_MESH 749 if (scan->meshid != NULL) { 750 IEEE80211_VERIFY_ELEMENT(scan->meshid, IEEE80211_MESHID_LEN, 751 scan->status |= IEEE80211_BPARSE_MESHID_INVALID); 752 } 753 #endif 754 /* 755 * Process HT ie's. This is complicated by our 756 * accepting both the standard ie's and the pre-draft 757 * vendor OUI ie's that some vendors still use/require. 758 */ 759 if (scan->htcap != NULL) { 760 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 761 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 762 4 + sizeof(struct ieee80211_ie_htcap)-2 : 763 sizeof(struct ieee80211_ie_htcap)-2, 764 scan->htcap = NULL); 765 } 766 if (scan->htinfo != NULL) { 767 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 768 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 769 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 770 sizeof(struct ieee80211_ie_htinfo)-2, 771 scan->htinfo = NULL); 772 } 773 774 /* Process VHT IEs */ 775 if (scan->vhtcap != NULL) { 776 IEEE80211_VERIFY_LENGTH(scan->vhtcap[1], 777 sizeof(struct ieee80211_vht_cap), 778 scan->vhtcap = NULL); 779 } 780 if (scan->vhtopmode != NULL) { 781 IEEE80211_VERIFY_LENGTH(scan->vhtopmode[1], 782 sizeof(struct ieee80211_vht_operation), 783 scan->vhtopmode = NULL); 784 } 785 786 return scan->status; 787 } 788 789 /* 790 * Parse an Action frame. Return 0 on success, non-zero on failure. 791 */ 792 int 793 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 794 { 795 struct ieee80211vap *vap = ni->ni_vap; 796 const struct ieee80211_action *ia; 797 struct ieee80211_frame *wh; 798 uint8_t *frm, *efrm; 799 800 /* 801 * action frame format: 802 * [1] category 803 * [1] action 804 * [tlv] parameters 805 */ 806 wh = mtod(m, struct ieee80211_frame *); 807 frm = (u_int8_t *)&wh[1]; 808 efrm = mtod(m, u_int8_t *) + m->m_len; 809 IEEE80211_VERIFY_LENGTH(efrm - frm, 810 sizeof(struct ieee80211_action), return EINVAL); 811 ia = (const struct ieee80211_action *) frm; 812 813 vap->iv_stats.is_rx_action++; 814 IEEE80211_NODE_STAT(ni, rx_action); 815 816 /* verify frame payloads but defer processing */ 817 switch (ia->ia_category) { 818 case IEEE80211_ACTION_CAT_BA: 819 switch (ia->ia_action) { 820 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 821 IEEE80211_VERIFY_LENGTH(efrm - frm, 822 sizeof(struct ieee80211_action_ba_addbarequest), 823 return EINVAL); 824 break; 825 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 826 IEEE80211_VERIFY_LENGTH(efrm - frm, 827 sizeof(struct ieee80211_action_ba_addbaresponse), 828 return EINVAL); 829 break; 830 case IEEE80211_ACTION_BA_DELBA: 831 IEEE80211_VERIFY_LENGTH(efrm - frm, 832 sizeof(struct ieee80211_action_ba_delba), 833 return EINVAL); 834 break; 835 } 836 break; 837 case IEEE80211_ACTION_CAT_HT: 838 switch (ia->ia_action) { 839 case IEEE80211_ACTION_HT_TXCHWIDTH: 840 IEEE80211_VERIFY_LENGTH(efrm - frm, 841 sizeof(struct ieee80211_action_ht_txchwidth), 842 return EINVAL); 843 break; 844 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 845 IEEE80211_VERIFY_LENGTH(efrm - frm, 846 sizeof(struct ieee80211_action_ht_mimopowersave), 847 return EINVAL); 848 break; 849 } 850 break; 851 #ifdef IEEE80211_SUPPORT_MESH 852 case IEEE80211_ACTION_CAT_MESH: 853 switch (ia->ia_action) { 854 case IEEE80211_ACTION_MESH_LMETRIC: 855 /* 856 * XXX: verification is true only if we are using 857 * Airtime link metric (default) 858 */ 859 IEEE80211_VERIFY_LENGTH(efrm - frm, 860 sizeof(struct ieee80211_meshlmetric_ie), 861 return EINVAL); 862 break; 863 case IEEE80211_ACTION_MESH_HWMP: 864 /* verify something */ 865 break; 866 case IEEE80211_ACTION_MESH_GANN: 867 IEEE80211_VERIFY_LENGTH(efrm - frm, 868 sizeof(struct ieee80211_meshgann_ie), 869 return EINVAL); 870 break; 871 case IEEE80211_ACTION_MESH_CC: 872 case IEEE80211_ACTION_MESH_MCCA_SREQ: 873 case IEEE80211_ACTION_MESH_MCCA_SREP: 874 case IEEE80211_ACTION_MESH_MCCA_AREQ: 875 case IEEE80211_ACTION_MESH_MCCA_ADVER: 876 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 877 case IEEE80211_ACTION_MESH_TBTT_REQ: 878 case IEEE80211_ACTION_MESH_TBTT_RES: 879 /* reject these early on, not implemented */ 880 IEEE80211_DISCARD(vap, 881 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 882 wh, NULL, "not implemented yet, act=0x%02X", 883 ia->ia_action); 884 return EINVAL; 885 } 886 break; 887 case IEEE80211_ACTION_CAT_SELF_PROT: 888 /* If TA or RA group address discard silently */ 889 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 890 IEEE80211_IS_MULTICAST(wh->i_addr2)) 891 return EINVAL; 892 /* 893 * XXX: Should we verify complete length now or it is 894 * to varying in sizes? 895 */ 896 switch (ia->ia_action) { 897 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 898 case IEEE80211_ACTION_MESHPEERING_CLOSE: 899 /* is not a peering candidate (yet) */ 900 if (ni == vap->iv_bss) 901 return EINVAL; 902 break; 903 } 904 break; 905 #endif 906 case IEEE80211_ACTION_CAT_VHT: 907 printf("%s: TODO: VHT handling!\n", __func__); 908 break; 909 } 910 return 0; 911 } 912 913 #ifdef IEEE80211_DEBUG 914 /* 915 * Debugging support. 916 */ 917 void 918 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 919 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 920 { 921 printf("[%s] discard %s frame, ssid mismatch: ", 922 ether_sprintf(mac), tag); 923 ieee80211_print_essid(ssid + 2, ssid[1]); 924 printf("\n"); 925 } 926 927 /* 928 * Return the bssid of a frame. 929 */ 930 static const uint8_t * 931 ieee80211_getbssid(const struct ieee80211vap *vap, 932 const struct ieee80211_frame *wh) 933 { 934 if (vap->iv_opmode == IEEE80211_M_STA) 935 return wh->i_addr2; 936 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 937 return wh->i_addr1; 938 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 939 return wh->i_addr1; 940 return wh->i_addr3; 941 } 942 943 #include <machine/stdarg.h> 944 945 void 946 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 947 { 948 char buf[256]; /* XXX */ 949 va_list ap; 950 int len; 951 952 va_start(ap, fmt); 953 len = vsnprintf(buf, sizeof(buf), fmt, ap); 954 va_end(ap); 955 956 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 957 958 if (len >= sizeof(buf)) 959 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 960 } 961 962 void 963 ieee80211_note_frame(const struct ieee80211vap *vap, 964 const struct ieee80211_frame *wh, 965 const char *fmt, ...) 966 { 967 char buf[256]; /* XXX */ 968 va_list ap; 969 int len; 970 971 va_start(ap, fmt); 972 len = vsnprintf(buf, sizeof(buf), fmt, ap); 973 va_end(ap); 974 if_printf(vap->iv_ifp, "[%s] %s\n", 975 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 976 977 if (len >= sizeof(buf)) 978 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 979 } 980 981 void 982 ieee80211_note_mac(const struct ieee80211vap *vap, 983 const uint8_t mac[IEEE80211_ADDR_LEN], 984 const char *fmt, ...) 985 { 986 char buf[256]; /* XXX */ 987 va_list ap; 988 int len; 989 990 va_start(ap, fmt); 991 len = vsnprintf(buf, sizeof(buf), fmt, ap); 992 va_end(ap); 993 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 994 995 if (len >= sizeof(buf)) 996 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 997 } 998 999 void 1000 ieee80211_discard_frame(const struct ieee80211vap *vap, 1001 const struct ieee80211_frame *wh, 1002 const char *type, const char *fmt, ...) 1003 { 1004 char buf[256]; /* XXX */ 1005 va_list ap; 1006 int len; 1007 1008 va_start(ap, fmt); 1009 len = vsnprintf(buf, sizeof(buf), fmt, ap); 1010 va_end(ap); 1011 1012 if_printf(vap->iv_ifp, "[%s] discard %s frame, %s\n", 1013 ether_sprintf(ieee80211_getbssid(vap, wh)), 1014 type != NULL ? type : ieee80211_mgt_subtype_name(wh->i_fc[0]), 1015 buf); 1016 1017 if (len >= sizeof(buf)) 1018 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 1019 } 1020 1021 void 1022 ieee80211_discard_ie(const struct ieee80211vap *vap, 1023 const struct ieee80211_frame *wh, 1024 const char *type, const char *fmt, ...) 1025 { 1026 char buf[256]; /* XXX */ 1027 va_list ap; 1028 int len; 1029 1030 va_start(ap, fmt); 1031 len = vsnprintf(buf, sizeof(buf), fmt, ap); 1032 va_end(ap); 1033 1034 if_printf(vap->iv_ifp, "[%s] discard%s%s information element, %s\n", 1035 ether_sprintf(ieee80211_getbssid(vap, wh)), 1036 type != NULL ? " " : "", type != NULL ? type : "", buf); 1037 1038 if (len >= sizeof(buf)) 1039 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 1040 } 1041 1042 void 1043 ieee80211_discard_mac(const struct ieee80211vap *vap, 1044 const uint8_t mac[IEEE80211_ADDR_LEN], 1045 const char *type, const char *fmt, ...) 1046 { 1047 char buf[256]; /* XXX */ 1048 va_list ap; 1049 int len; 1050 1051 va_start(ap, fmt); 1052 len = vsnprintf(buf, sizeof(buf), fmt, ap); 1053 va_end(ap); 1054 1055 if_printf(vap->iv_ifp, "[%s] discard%s%s frame, %s\n", 1056 ether_sprintf(mac), 1057 type != NULL ? " " : "", type != NULL ? type : "", buf); 1058 1059 if (len >= sizeof(buf)) 1060 printf("%s: XXX buffer too small: len = %d\n", __func__, len); 1061 } 1062 #endif /* IEEE80211_DEBUG */ 1063