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sys/net80211/ieee80211_input.c
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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_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, 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 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 ifp->if_input(ifp, m); 309 } 310 311 struct mbuf * 312 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen, 313 uint8_t qos) 314 { 315 struct ieee80211_qosframe_addr4 wh; 316 struct ether_header *eh; 317 struct llc *llc; 318 319 KASSERT(hdrlen <= sizeof(wh), 320 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 321 322 if (m->m_len < hdrlen + sizeof(*llc) && 323 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 324 vap->iv_stats.is_rx_tooshort++; 325 /* XXX msg */ 326 return NULL; 327 } 328 memcpy(&wh, mtod(m, caddr_t), hdrlen); 329 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 330 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 331 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 332 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 333 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 334 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 335 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX)) && 336 /* Do not want to touch A-MSDU frames. */ 337 !(qos & IEEE80211_QOS_AMSDU)) { 338 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 339 llc = NULL; 340 } else { 341 m_adj(m, hdrlen - sizeof(*eh)); 342 } 343 eh = mtod(m, struct ether_header *); 344 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 345 case IEEE80211_FC1_DIR_NODS: 346 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 347 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 348 break; 349 case IEEE80211_FC1_DIR_TODS: 350 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 351 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 352 break; 353 case IEEE80211_FC1_DIR_FROMDS: 354 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 355 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 356 break; 357 case IEEE80211_FC1_DIR_DSTODS: 358 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 359 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 360 break; 361 } 362 #ifndef __NO_STRICT_ALIGNMENT 363 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 364 m = ieee80211_realign(vap, m, sizeof(*eh)); 365 if (m == NULL) 366 return NULL; 367 } 368 #endif /* !__NO_STRICT_ALIGNMENT */ 369 if (llc != NULL) { 370 eh = mtod(m, struct ether_header *); 371 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 372 } 373 return m; 374 } 375 376 /* 377 * Decap a frame encapsulated in a fast-frame/A-MSDU. 378 */ 379 struct mbuf * 380 ieee80211_decap1(struct mbuf *m, int *framelen) 381 { 382 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 383 struct ether_header *eh; 384 struct llc *llc; 385 const uint8_t llc_hdr_mac[ETHER_ADDR_LEN] = { 386 /* MAC address matching the 802.2 LLC header */ 387 LLC_SNAP_LSAP, LLC_SNAP_LSAP, LLC_UI, 0, 0, 0 388 }; 389 390 /* 391 * The frame has an 802.3 header followed by an 802.2 392 * LLC header. The encapsulated frame length is in the 393 * first header type field; save that and overwrite it 394 * with the true type field found in the second. Then 395 * copy the 802.3 header up to where it belongs and 396 * adjust the mbuf contents to remove the void. 397 */ 398 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 399 return NULL; 400 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 401 402 /* 403 * Detect possible attack where a single 802.11 frame is processed 404 * as an A-MSDU frame due to an adversary setting the A-MSDU present 405 * bit in the 802.11 QoS header. [FragAttacks] 406 */ 407 if (memcmp(eh->ether_dhost, llc_hdr_mac, ETHER_ADDR_LEN) == 0) 408 return NULL; 409 410 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 411 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 412 + sizeof(struct ether_header) - sizeof(struct llc); 413 eh->ether_type = llc->llc_un.type_snap.ether_type; 414 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 415 sizeof(struct ether_header)); 416 m_adj(m, sizeof(struct llc)); 417 return m; 418 #undef FF_LLC_SIZE 419 } 420 421 /* 422 * Install received rate set information in the node's state block. 423 */ 424 int 425 ieee80211_setup_rates(struct ieee80211_node *ni, 426 const uint8_t *rates, const uint8_t *xrates, int flags) 427 { 428 struct ieee80211vap *vap = ni->ni_vap; 429 struct ieee80211_rateset *rs = &ni->ni_rates; 430 431 memset(rs, 0, sizeof(*rs)); 432 rs->rs_nrates = rates[1]; 433 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 434 if (xrates != NULL) { 435 uint8_t nxrates; 436 /* 437 * Tack on 11g extended supported rate element. 438 */ 439 nxrates = xrates[1]; 440 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 441 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 442 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 443 "extended rate set too large; only using " 444 "%u of %u rates", nxrates, xrates[1]); 445 vap->iv_stats.is_rx_rstoobig++; 446 } 447 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 448 rs->rs_nrates += nxrates; 449 } 450 return ieee80211_fix_rate(ni, rs, flags); 451 } 452 453 /* 454 * Send a management frame error response to the specified 455 * station. If ni is associated with the station then use 456 * it; otherwise allocate a temporary node suitable for 457 * transmitting the frame and then free the reference so 458 * it will go away as soon as the frame has been transmitted. 459 */ 460 void 461 ieee80211_send_error(struct ieee80211_node *ni, 462 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 463 { 464 struct ieee80211vap *vap = ni->ni_vap; 465 int istmp; 466 467 if (ni == vap->iv_bss) { 468 if (vap->iv_state != IEEE80211_S_RUN) { 469 /* 470 * XXX hack until we get rid of this routine. 471 * We can be called prior to the vap reaching 472 * run state under certain conditions in which 473 * case iv_bss->ni_chan will not be setup. 474 * Check for this explicitly and and just ignore 475 * the request. 476 */ 477 return; 478 } 479 ni = ieee80211_tmp_node(vap, mac); 480 if (ni == NULL) { 481 /* XXX msg */ 482 return; 483 } 484 istmp = 1; 485 } else 486 istmp = 0; 487 IEEE80211_SEND_MGMT(ni, subtype, arg); 488 if (istmp) 489 ieee80211_free_node(ni); 490 } 491 492 int 493 ieee80211_alloc_challenge(struct ieee80211_node *ni) 494 { 495 if (ni->ni_challenge == NULL) 496 ni->ni_challenge = (uint32_t *) 497 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN, 498 M_80211_NODE, IEEE80211_M_NOWAIT); 499 if (ni->ni_challenge == NULL) { 500 IEEE80211_NOTE(ni->ni_vap, 501 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 502 "%s", "shared key challenge alloc failed"); 503 /* XXX statistic */ 504 } 505 return (ni->ni_challenge != NULL); 506 } 507 508 /* 509 * Parse a Beacon or ProbeResponse frame and return the 510 * useful information in an ieee80211_scanparams structure. 511 * Status is set to 0 if no problems were found; otherwise 512 * a bitmask of IEEE80211_BPARSE_* items is returned that 513 * describes the problems detected. 514 */ 515 int 516 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 517 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan) 518 { 519 struct ieee80211vap *vap = ni->ni_vap; 520 struct ieee80211com *ic = ni->ni_ic; 521 struct ieee80211_frame *wh; 522 uint8_t *frm, *efrm; 523 524 wh = mtod(m, struct ieee80211_frame *); 525 frm = (uint8_t *)&wh[1]; 526 efrm = mtod(m, uint8_t *) + m->m_len; 527 scan->status = 0; 528 /* 529 * beacon/probe response frame format 530 * 531 * XXX Update from 802.11-2012 - eg where HT is 532 * [8] time stamp 533 * [2] beacon interval 534 * [2] capability information 535 * [tlv] ssid 536 * [tlv] supported rates 537 * [tlv] country information 538 * [tlv] channel switch announcement (CSA) 539 * [tlv] parameter set (FH/DS) 540 * [tlv] erp information 541 * [tlv] extended supported rates 542 * [tlv] WME 543 * [tlv] WPA or RSN 544 * [tlv] HT capabilities 545 * [tlv] HT information 546 * [tlv] VHT capabilities 547 * [tlv] VHT information 548 * [tlv] Atheros capabilities 549 * [tlv] Mesh ID 550 * [tlv] Mesh Configuration 551 */ 552 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 553 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 554 memset(scan, 0, sizeof(*scan)); 555 scan->tstamp = frm; frm += 8; 556 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 557 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 558 scan->bchan = ieee80211_chan2ieee(ic, rxchan); 559 scan->chan = scan->bchan; 560 scan->ies = frm; 561 scan->ies_len = efrm - frm; 562 563 while (efrm - frm > 1) { 564 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 565 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 566 switch (*frm) { 567 case IEEE80211_ELEMID_SSID: 568 scan->ssid = frm; 569 break; 570 case IEEE80211_ELEMID_RATES: 571 scan->rates = frm; 572 break; 573 case IEEE80211_ELEMID_COUNTRY: 574 scan->country = frm; 575 break; 576 case IEEE80211_ELEMID_CSA: 577 scan->csa = frm; 578 break; 579 case IEEE80211_ELEMID_QUIET: 580 scan->quiet = frm; 581 break; 582 case IEEE80211_ELEMID_FHPARMS: 583 if (ic->ic_phytype == IEEE80211_T_FH) { 584 scan->fhdwell = le16dec(&frm[2]); 585 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 586 scan->fhindex = frm[6]; 587 } 588 break; 589 case IEEE80211_ELEMID_DSPARMS: 590 /* 591 * XXX hack this since depending on phytype 592 * is problematic for multi-mode devices. 593 */ 594 if (ic->ic_phytype != IEEE80211_T_FH) 595 scan->chan = frm[2]; 596 break; 597 case IEEE80211_ELEMID_TIM: 598 /* XXX ATIM? */ 599 scan->tim = frm; 600 scan->timoff = frm - mtod(m, uint8_t *); 601 break; 602 case IEEE80211_ELEMID_IBSSPARMS: 603 case IEEE80211_ELEMID_CFPARMS: 604 case IEEE80211_ELEMID_PWRCNSTR: 605 case IEEE80211_ELEMID_BSSLOAD: 606 case IEEE80211_ELEMID_APCHANREP: 607 /* NB: avoid debugging complaints */ 608 break; 609 case IEEE80211_ELEMID_XRATES: 610 scan->xrates = frm; 611 break; 612 case IEEE80211_ELEMID_ERP: 613 if (frm[1] != 1) { 614 IEEE80211_DISCARD_IE(vap, 615 IEEE80211_MSG_ELEMID, wh, "ERP", 616 "bad len %u", frm[1]); 617 vap->iv_stats.is_rx_elem_toobig++; 618 break; 619 } 620 scan->erp = frm[2] | 0x100; 621 break; 622 case IEEE80211_ELEMID_HTCAP: 623 scan->htcap = frm; 624 break; 625 case IEEE80211_ELEMID_VHT_CAP: 626 scan->vhtcap = frm; 627 break; 628 case IEEE80211_ELEMID_VHT_OPMODE: 629 scan->vhtopmode = frm; 630 break; 631 case IEEE80211_ELEMID_RSN: 632 scan->rsn = frm; 633 break; 634 case IEEE80211_ELEMID_HTINFO: 635 scan->htinfo = frm; 636 break; 637 #ifdef IEEE80211_SUPPORT_MESH 638 case IEEE80211_ELEMID_MESHID: 639 scan->meshid = frm; 640 break; 641 case IEEE80211_ELEMID_MESHCONF: 642 scan->meshconf = frm; 643 break; 644 #endif 645 /* Extended capabilities; nothing handles it for now */ 646 case IEEE80211_ELEMID_EXTCAP: 647 break; 648 case IEEE80211_ELEMID_VENDOR: 649 if (iswpaoui(frm)) 650 scan->wpa = frm; 651 else if (iswmeparam(frm) || iswmeinfo(frm)) 652 scan->wme = frm; 653 #ifdef IEEE80211_SUPPORT_SUPERG 654 else if (isatherosoui(frm)) 655 scan->ath = frm; 656 #endif 657 #ifdef IEEE80211_SUPPORT_TDMA 658 else if (istdmaoui(frm)) 659 scan->tdma = frm; 660 #endif 661 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 662 /* 663 * Accept pre-draft HT ie's if the 664 * standard ones have not been seen. 665 */ 666 if (ishtcapoui(frm)) { 667 if (scan->htcap == NULL) 668 scan->htcap = frm; 669 } else if (ishtinfooui(frm)) { 670 if (scan->htinfo == NULL) 671 scan->htcap = frm; 672 } 673 } 674 break; 675 default: 676 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 677 wh, "unhandled", 678 "id %u, len %u", *frm, frm[1]); 679 vap->iv_stats.is_rx_elem_unknown++; 680 break; 681 } 682 frm += frm[1] + 2; 683 } 684 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 685 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 686 if (scan->rates != NULL && scan->xrates != NULL) { 687 /* 688 * NB: don't process XRATES if RATES is missing. This 689 * avoids a potential null ptr deref and should be ok 690 * as the return code will already note RATES is missing 691 * (so callers shouldn't otherwise process the frame). 692 */ 693 IEEE80211_VERIFY_ELEMENT(scan->xrates, 694 IEEE80211_RATE_MAXSIZE - scan->rates[1], 695 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 696 } 697 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 698 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 699 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 700 /* 701 * Frame was received on a channel different from the 702 * one indicated in the DS params element id; 703 * silently discard it. 704 * 705 * NB: this can happen due to signal leakage. 706 * But we should take it for FH phy because 707 * the rssi value should be correct even for 708 * different hop pattern in FH. 709 */ 710 IEEE80211_DISCARD(vap, 711 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 712 wh, NULL, "for off-channel %u (bchan=%u)", 713 scan->chan, scan->bchan); 714 vap->iv_stats.is_rx_chanmismatch++; 715 scan->status |= IEEE80211_BPARSE_OFFCHAN; 716 } 717 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 718 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 719 IEEE80211_DISCARD(vap, 720 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 721 wh, NULL, "bogus beacon interval (%d TU)", 722 (int) scan->bintval); 723 vap->iv_stats.is_rx_badbintval++; 724 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 725 } 726 if (scan->country != NULL) { 727 /* 728 * Validate we have at least enough data to extract 729 * the country code. Not sure if we should return an 730 * error instead of discarding the IE; consider this 731 * being lenient as we don't depend on the data for 732 * correct operation. 733 */ 734 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 735 scan->country = NULL); 736 } 737 if (scan->csa != NULL) { 738 /* 739 * Validate Channel Switch Announcement; this must 740 * be the correct length or we toss the frame. 741 */ 742 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 743 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 744 } 745 /* 746 * Process HT ie's. This is complicated by our 747 * accepting both the standard ie's and the pre-draft 748 * vendor OUI ie's that some vendors still use/require. 749 */ 750 if (scan->htcap != NULL) { 751 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 752 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 753 4 + sizeof(struct ieee80211_ie_htcap)-2 : 754 sizeof(struct ieee80211_ie_htcap)-2, 755 scan->htcap = NULL); 756 } 757 if (scan->htinfo != NULL) { 758 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 759 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 760 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 761 sizeof(struct ieee80211_ie_htinfo)-2, 762 scan->htinfo = NULL); 763 } 764 765 /* Process VHT IEs */ 766 if (scan->vhtcap != NULL) { 767 IEEE80211_VERIFY_LENGTH(scan->vhtcap[1], 768 sizeof(struct ieee80211_ie_vhtcap) - 2, 769 scan->vhtcap = NULL); 770 } 771 if (scan->vhtopmode != NULL) { 772 IEEE80211_VERIFY_LENGTH(scan->vhtopmode[1], 773 sizeof(struct ieee80211_ie_vht_operation) - 2, 774 scan->vhtopmode = NULL); 775 } 776 777 return scan->status; 778 } 779 780 /* 781 * Parse an Action frame. Return 0 on success, non-zero on failure. 782 */ 783 int 784 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 785 { 786 struct ieee80211vap *vap = ni->ni_vap; 787 const struct ieee80211_action *ia; 788 struct ieee80211_frame *wh; 789 uint8_t *frm, *efrm; 790 791 /* 792 * action frame format: 793 * [1] category 794 * [1] action 795 * [tlv] parameters 796 */ 797 wh = mtod(m, struct ieee80211_frame *); 798 frm = (u_int8_t *)&wh[1]; 799 efrm = mtod(m, u_int8_t *) + m->m_len; 800 IEEE80211_VERIFY_LENGTH(efrm - frm, 801 sizeof(struct ieee80211_action), return EINVAL); 802 ia = (const struct ieee80211_action *) frm; 803 804 vap->iv_stats.is_rx_action++; 805 IEEE80211_NODE_STAT(ni, rx_action); 806 807 /* verify frame payloads but defer processing */ 808 switch (ia->ia_category) { 809 case IEEE80211_ACTION_CAT_BA: 810 switch (ia->ia_action) { 811 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 812 IEEE80211_VERIFY_LENGTH(efrm - frm, 813 sizeof(struct ieee80211_action_ba_addbarequest), 814 return EINVAL); 815 break; 816 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 817 IEEE80211_VERIFY_LENGTH(efrm - frm, 818 sizeof(struct ieee80211_action_ba_addbaresponse), 819 return EINVAL); 820 break; 821 case IEEE80211_ACTION_BA_DELBA: 822 IEEE80211_VERIFY_LENGTH(efrm - frm, 823 sizeof(struct ieee80211_action_ba_delba), 824 return EINVAL); 825 break; 826 } 827 break; 828 case IEEE80211_ACTION_CAT_HT: 829 switch (ia->ia_action) { 830 case IEEE80211_ACTION_HT_TXCHWIDTH: 831 IEEE80211_VERIFY_LENGTH(efrm - frm, 832 sizeof(struct ieee80211_action_ht_txchwidth), 833 return EINVAL); 834 break; 835 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 836 IEEE80211_VERIFY_LENGTH(efrm - frm, 837 sizeof(struct ieee80211_action_ht_mimopowersave), 838 return EINVAL); 839 break; 840 } 841 break; 842 #ifdef IEEE80211_SUPPORT_MESH 843 case IEEE80211_ACTION_CAT_MESH: 844 switch (ia->ia_action) { 845 case IEEE80211_ACTION_MESH_LMETRIC: 846 /* 847 * XXX: verification is true only if we are using 848 * Airtime link metric (default) 849 */ 850 IEEE80211_VERIFY_LENGTH(efrm - frm, 851 sizeof(struct ieee80211_meshlmetric_ie), 852 return EINVAL); 853 break; 854 case IEEE80211_ACTION_MESH_HWMP: 855 /* verify something */ 856 break; 857 case IEEE80211_ACTION_MESH_GANN: 858 IEEE80211_VERIFY_LENGTH(efrm - frm, 859 sizeof(struct ieee80211_meshgann_ie), 860 return EINVAL); 861 break; 862 case IEEE80211_ACTION_MESH_CC: 863 case IEEE80211_ACTION_MESH_MCCA_SREQ: 864 case IEEE80211_ACTION_MESH_MCCA_SREP: 865 case IEEE80211_ACTION_MESH_MCCA_AREQ: 866 case IEEE80211_ACTION_MESH_MCCA_ADVER: 867 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 868 case IEEE80211_ACTION_MESH_TBTT_REQ: 869 case IEEE80211_ACTION_MESH_TBTT_RES: 870 /* reject these early on, not implemented */ 871 IEEE80211_DISCARD(vap, 872 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 873 wh, NULL, "not implemented yet, act=0x%02X", 874 ia->ia_action); 875 return EINVAL; 876 } 877 break; 878 case IEEE80211_ACTION_CAT_SELF_PROT: 879 /* If TA or RA group address discard silently */ 880 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 881 IEEE80211_IS_MULTICAST(wh->i_addr2)) 882 return EINVAL; 883 /* 884 * XXX: Should we verify complete length now or it is 885 * to varying in sizes? 886 */ 887 switch (ia->ia_action) { 888 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 889 case IEEE80211_ACTION_MESHPEERING_CLOSE: 890 /* is not a peering candidate (yet) */ 891 if (ni == vap->iv_bss) 892 return EINVAL; 893 break; 894 } 895 break; 896 #endif 897 case IEEE80211_ACTION_CAT_VHT: 898 printf("%s: TODO: VHT handling!\n", __func__); 899 break; 900 } 901 return 0; 902 } 903 904 #ifdef IEEE80211_DEBUG 905 /* 906 * Debugging support. 907 */ 908 void 909 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 910 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 911 { 912 printf("[%s] discard %s frame, ssid mismatch: ", 913 ether_sprintf(mac), tag); 914 ieee80211_print_essid(ssid + 2, ssid[1]); 915 printf("\n"); 916 } 917 918 /* 919 * Return the bssid of a frame. 920 */ 921 static const uint8_t * 922 ieee80211_getbssid(const struct ieee80211vap *vap, 923 const struct ieee80211_frame *wh) 924 { 925 if (vap->iv_opmode == IEEE80211_M_STA) 926 return wh->i_addr2; 927 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 928 return wh->i_addr1; 929 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 930 return wh->i_addr1; 931 return wh->i_addr3; 932 } 933 934 #include <machine/stdarg.h> 935 936 void 937 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 938 { 939 char buf[128]; /* XXX */ 940 va_list ap; 941 942 va_start(ap, fmt); 943 vsnprintf(buf, sizeof(buf), fmt, ap); 944 va_end(ap); 945 946 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 947 } 948 949 void 950 ieee80211_note_frame(const struct ieee80211vap *vap, 951 const struct ieee80211_frame *wh, 952 const char *fmt, ...) 953 { 954 char buf[128]; /* XXX */ 955 va_list ap; 956 957 va_start(ap, fmt); 958 vsnprintf(buf, sizeof(buf), fmt, ap); 959 va_end(ap); 960 if_printf(vap->iv_ifp, "[%s] %s\n", 961 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 962 } 963 964 void 965 ieee80211_note_mac(const struct ieee80211vap *vap, 966 const uint8_t mac[IEEE80211_ADDR_LEN], 967 const char *fmt, ...) 968 { 969 char buf[128]; /* XXX */ 970 va_list ap; 971 972 va_start(ap, fmt); 973 vsnprintf(buf, sizeof(buf), fmt, ap); 974 va_end(ap); 975 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 976 } 977 978 void 979 ieee80211_discard_frame(const struct ieee80211vap *vap, 980 const struct ieee80211_frame *wh, 981 const char *type, const char *fmt, ...) 982 { 983 va_list ap; 984 985 if_printf(vap->iv_ifp, "[%s] discard ", 986 ether_sprintf(ieee80211_getbssid(vap, wh))); 987 printf("%s frame, ", type != NULL ? type : 988 ieee80211_mgt_subtype_name(wh->i_fc[0])); 989 va_start(ap, fmt); 990 vprintf(fmt, ap); 991 va_end(ap); 992 printf("\n"); 993 } 994 995 void 996 ieee80211_discard_ie(const struct ieee80211vap *vap, 997 const struct ieee80211_frame *wh, 998 const char *type, const char *fmt, ...) 999 { 1000 va_list ap; 1001 1002 if_printf(vap->iv_ifp, "[%s] discard ", 1003 ether_sprintf(ieee80211_getbssid(vap, wh))); 1004 if (type != NULL) 1005 printf("%s information element, ", type); 1006 else 1007 printf("information element, "); 1008 va_start(ap, fmt); 1009 vprintf(fmt, ap); 1010 va_end(ap); 1011 printf("\n"); 1012 } 1013 1014 void 1015 ieee80211_discard_mac(const struct ieee80211vap *vap, 1016 const uint8_t mac[IEEE80211_ADDR_LEN], 1017 const char *type, const char *fmt, ...) 1018 { 1019 va_list ap; 1020 1021 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 1022 if (type != NULL) 1023 printf("%s frame, ", type); 1024 else 1025 printf("frame, "); 1026 va_start(ap, fmt); 1027 vprintf(fmt, ap); 1028 va_end(ap); 1029 printf("\n"); 1030 } 1031 #endif /* IEEE80211_DEBUG */
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