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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: releng/12.0/sys/net80211/ieee80211_input.c 326272 2017-11-27 15:23:17Z pfg $"); 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 { 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 /* 193 * Remove frag to insure it doesn't get reaped by timer. 194 */ 195 if (ni->ni_table == NULL) { 196 /* 197 * Should never happen. If the node is orphaned (not in 198 * the table) then input packets should not reach here. 199 * Otherwise, a concurrent request that yanks the table 200 * should be blocked by other interlocking and/or by first 201 * shutting the driver down. Regardless, be defensive 202 * here and just bail 203 */ 204 /* XXX need msg+stat */ 205 m_freem(m); 206 return NULL; 207 } 208 IEEE80211_NODE_LOCK(ni->ni_table); 209 mfrag = ni->ni_rxfrag[0]; 210 ni->ni_rxfrag[0] = NULL; 211 IEEE80211_NODE_UNLOCK(ni->ni_table); 212 213 /* 214 * Validate new fragment is in order and 215 * related to the previous ones. 216 */ 217 if (mfrag != NULL) { 218 uint16_t last_rxseq; 219 220 lwh = mtod(mfrag, struct ieee80211_frame *); 221 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 222 /* NB: check seq # and frag together */ 223 if (rxseq == last_rxseq+1 && 224 IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) && 225 IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 226 /* XXX clear MORE_FRAG bit? */ 227 /* track last seqnum and fragno */ 228 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 229 230 m_adj(m, hdrspace); /* strip header */ 231 m_catpkt(mfrag, m); /* concatenate */ 232 } else { 233 /* 234 * Unrelated fragment or no space for it, 235 * clear current fragments. 236 */ 237 m_freem(mfrag); 238 mfrag = NULL; 239 } 240 } 241 242 if (mfrag == NULL) { 243 if (fragno != 0) { /* !first fragment, discard */ 244 vap->iv_stats.is_rx_defrag++; 245 IEEE80211_NODE_STAT(ni, rx_defrag); 246 m_freem(m); 247 return NULL; 248 } 249 mfrag = m; 250 } 251 if (more_frag) { /* more to come, save */ 252 ni->ni_rxfragstamp = ticks; 253 ni->ni_rxfrag[0] = mfrag; 254 mfrag = NULL; 255 } 256 return mfrag; 257 } 258 259 void 260 ieee80211_deliver_data(struct ieee80211vap *vap, 261 struct ieee80211_node *ni, struct mbuf *m) 262 { 263 struct ether_header *eh = mtod(m, struct ether_header *); 264 struct ifnet *ifp = vap->iv_ifp; 265 266 /* clear driver/net80211 flags before passing up */ 267 m->m_flags &= ~(M_MCAST | M_BCAST); 268 m_clrprotoflags(m); 269 270 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 271 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 272 /* 273 * Do accounting. 274 */ 275 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 276 IEEE80211_NODE_STAT(ni, rx_data); 277 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 278 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 279 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 280 m->m_flags |= M_BCAST; 281 else 282 m->m_flags |= M_MCAST; 283 IEEE80211_NODE_STAT(ni, rx_mcast); 284 } else 285 IEEE80211_NODE_STAT(ni, rx_ucast); 286 m->m_pkthdr.rcvif = ifp; 287 288 if (ni->ni_vlan != 0) { 289 /* attach vlan tag */ 290 m->m_pkthdr.ether_vtag = ni->ni_vlan; 291 m->m_flags |= M_VLANTAG; 292 } 293 ifp->if_input(ifp, m); 294 } 295 296 struct mbuf * 297 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 298 { 299 struct ieee80211_qosframe_addr4 wh; 300 struct ether_header *eh; 301 struct llc *llc; 302 303 KASSERT(hdrlen <= sizeof(wh), 304 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 305 306 if (m->m_len < hdrlen + sizeof(*llc) && 307 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 308 vap->iv_stats.is_rx_tooshort++; 309 /* XXX msg */ 310 return NULL; 311 } 312 memcpy(&wh, mtod(m, caddr_t), hdrlen); 313 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 314 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 315 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 316 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 317 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 318 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 319 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 320 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 321 llc = NULL; 322 } else { 323 m_adj(m, hdrlen - sizeof(*eh)); 324 } 325 eh = mtod(m, struct ether_header *); 326 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 327 case IEEE80211_FC1_DIR_NODS: 328 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 329 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 330 break; 331 case IEEE80211_FC1_DIR_TODS: 332 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 333 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 334 break; 335 case IEEE80211_FC1_DIR_FROMDS: 336 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 337 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 338 break; 339 case IEEE80211_FC1_DIR_DSTODS: 340 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 341 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 342 break; 343 } 344 #ifndef __NO_STRICT_ALIGNMENT 345 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 346 m = ieee80211_realign(vap, m, sizeof(*eh)); 347 if (m == NULL) 348 return NULL; 349 } 350 #endif /* !__NO_STRICT_ALIGNMENT */ 351 if (llc != NULL) { 352 eh = mtod(m, struct ether_header *); 353 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 354 } 355 return m; 356 } 357 358 /* 359 * Decap a frame encapsulated in a fast-frame/A-MSDU. 360 */ 361 struct mbuf * 362 ieee80211_decap1(struct mbuf *m, int *framelen) 363 { 364 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 365 struct ether_header *eh; 366 struct llc *llc; 367 368 /* 369 * The frame has an 802.3 header followed by an 802.2 370 * LLC header. The encapsulated frame length is in the 371 * first header type field; save that and overwrite it 372 * with the true type field found in the second. Then 373 * copy the 802.3 header up to where it belongs and 374 * adjust the mbuf contents to remove the void. 375 */ 376 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 377 return NULL; 378 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 379 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 380 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 381 + sizeof(struct ether_header) - sizeof(struct llc); 382 eh->ether_type = llc->llc_un.type_snap.ether_type; 383 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 384 sizeof(struct ether_header)); 385 m_adj(m, sizeof(struct llc)); 386 return m; 387 #undef FF_LLC_SIZE 388 } 389 390 /* 391 * Install received rate set information in the node's state block. 392 */ 393 int 394 ieee80211_setup_rates(struct ieee80211_node *ni, 395 const uint8_t *rates, const uint8_t *xrates, int flags) 396 { 397 struct ieee80211vap *vap = ni->ni_vap; 398 struct ieee80211_rateset *rs = &ni->ni_rates; 399 400 memset(rs, 0, sizeof(*rs)); 401 rs->rs_nrates = rates[1]; 402 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 403 if (xrates != NULL) { 404 uint8_t nxrates; 405 /* 406 * Tack on 11g extended supported rate element. 407 */ 408 nxrates = xrates[1]; 409 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 410 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 411 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 412 "extended rate set too large; only using " 413 "%u of %u rates", nxrates, xrates[1]); 414 vap->iv_stats.is_rx_rstoobig++; 415 } 416 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 417 rs->rs_nrates += nxrates; 418 } 419 return ieee80211_fix_rate(ni, rs, flags); 420 } 421 422 /* 423 * Send a management frame error response to the specified 424 * station. If ni is associated with the station then use 425 * it; otherwise allocate a temporary node suitable for 426 * transmitting the frame and then free the reference so 427 * it will go away as soon as the frame has been transmitted. 428 */ 429 void 430 ieee80211_send_error(struct ieee80211_node *ni, 431 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 432 { 433 struct ieee80211vap *vap = ni->ni_vap; 434 int istmp; 435 436 if (ni == vap->iv_bss) { 437 if (vap->iv_state != IEEE80211_S_RUN) { 438 /* 439 * XXX hack until we get rid of this routine. 440 * We can be called prior to the vap reaching 441 * run state under certain conditions in which 442 * case iv_bss->ni_chan will not be setup. 443 * Check for this explicitly and and just ignore 444 * the request. 445 */ 446 return; 447 } 448 ni = ieee80211_tmp_node(vap, mac); 449 if (ni == NULL) { 450 /* XXX msg */ 451 return; 452 } 453 istmp = 1; 454 } else 455 istmp = 0; 456 IEEE80211_SEND_MGMT(ni, subtype, arg); 457 if (istmp) 458 ieee80211_free_node(ni); 459 } 460 461 int 462 ieee80211_alloc_challenge(struct ieee80211_node *ni) 463 { 464 if (ni->ni_challenge == NULL) 465 ni->ni_challenge = (uint32_t *) 466 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN, 467 M_80211_NODE, IEEE80211_M_NOWAIT); 468 if (ni->ni_challenge == NULL) { 469 IEEE80211_NOTE(ni->ni_vap, 470 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 471 "%s", "shared key challenge alloc failed"); 472 /* XXX statistic */ 473 } 474 return (ni->ni_challenge != NULL); 475 } 476 477 /* 478 * Parse a Beacon or ProbeResponse frame and return the 479 * useful information in an ieee80211_scanparams structure. 480 * Status is set to 0 if no problems were found; otherwise 481 * a bitmask of IEEE80211_BPARSE_* items is returned that 482 * describes the problems detected. 483 */ 484 int 485 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 486 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan) 487 { 488 struct ieee80211vap *vap = ni->ni_vap; 489 struct ieee80211com *ic = ni->ni_ic; 490 struct ieee80211_frame *wh; 491 uint8_t *frm, *efrm; 492 493 wh = mtod(m, struct ieee80211_frame *); 494 frm = (uint8_t *)&wh[1]; 495 efrm = mtod(m, uint8_t *) + m->m_len; 496 scan->status = 0; 497 /* 498 * beacon/probe response frame format 499 * 500 * XXX Update from 802.11-2012 - eg where HT is 501 * [8] time stamp 502 * [2] beacon interval 503 * [2] capability information 504 * [tlv] ssid 505 * [tlv] supported rates 506 * [tlv] country information 507 * [tlv] channel switch announcement (CSA) 508 * [tlv] parameter set (FH/DS) 509 * [tlv] erp information 510 * [tlv] extended supported rates 511 * [tlv] WME 512 * [tlv] WPA or RSN 513 * [tlv] HT capabilities 514 * [tlv] HT information 515 * [tlv] VHT capabilities 516 * [tlv] VHT information 517 * [tlv] Atheros capabilities 518 * [tlv] Mesh ID 519 * [tlv] Mesh Configuration 520 */ 521 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 522 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 523 memset(scan, 0, sizeof(*scan)); 524 scan->tstamp = frm; frm += 8; 525 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 526 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 527 scan->bchan = ieee80211_chan2ieee(ic, rxchan); 528 scan->chan = scan->bchan; 529 scan->ies = frm; 530 scan->ies_len = efrm - frm; 531 532 while (efrm - frm > 1) { 533 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 534 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 535 switch (*frm) { 536 case IEEE80211_ELEMID_SSID: 537 scan->ssid = frm; 538 break; 539 case IEEE80211_ELEMID_RATES: 540 scan->rates = frm; 541 break; 542 case IEEE80211_ELEMID_COUNTRY: 543 scan->country = frm; 544 break; 545 case IEEE80211_ELEMID_CSA: 546 scan->csa = frm; 547 break; 548 case IEEE80211_ELEMID_QUIET: 549 scan->quiet = frm; 550 break; 551 case IEEE80211_ELEMID_FHPARMS: 552 if (ic->ic_phytype == IEEE80211_T_FH) { 553 scan->fhdwell = le16dec(&frm[2]); 554 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 555 scan->fhindex = frm[6]; 556 } 557 break; 558 case IEEE80211_ELEMID_DSPARMS: 559 /* 560 * XXX hack this since depending on phytype 561 * is problematic for multi-mode devices. 562 */ 563 if (ic->ic_phytype != IEEE80211_T_FH) 564 scan->chan = frm[2]; 565 break; 566 case IEEE80211_ELEMID_TIM: 567 /* XXX ATIM? */ 568 scan->tim = frm; 569 scan->timoff = frm - mtod(m, uint8_t *); 570 break; 571 case IEEE80211_ELEMID_IBSSPARMS: 572 case IEEE80211_ELEMID_CFPARMS: 573 case IEEE80211_ELEMID_PWRCNSTR: 574 case IEEE80211_ELEMID_BSSLOAD: 575 case IEEE80211_ELEMID_APCHANREP: 576 /* NB: avoid debugging complaints */ 577 break; 578 case IEEE80211_ELEMID_XRATES: 579 scan->xrates = frm; 580 break; 581 case IEEE80211_ELEMID_ERP: 582 if (frm[1] != 1) { 583 IEEE80211_DISCARD_IE(vap, 584 IEEE80211_MSG_ELEMID, wh, "ERP", 585 "bad len %u", frm[1]); 586 vap->iv_stats.is_rx_elem_toobig++; 587 break; 588 } 589 scan->erp = frm[2] | 0x100; 590 break; 591 case IEEE80211_ELEMID_HTCAP: 592 scan->htcap = frm; 593 break; 594 case IEEE80211_ELEMID_VHT_CAP: 595 scan->vhtcap = frm; 596 break; 597 case IEEE80211_ELEMID_VHT_OPMODE: 598 scan->vhtopmode = frm; 599 break; 600 case IEEE80211_ELEMID_RSN: 601 scan->rsn = frm; 602 break; 603 case IEEE80211_ELEMID_HTINFO: 604 scan->htinfo = frm; 605 break; 606 #ifdef IEEE80211_SUPPORT_MESH 607 case IEEE80211_ELEMID_MESHID: 608 scan->meshid = frm; 609 break; 610 case IEEE80211_ELEMID_MESHCONF: 611 scan->meshconf = frm; 612 break; 613 #endif 614 /* Extended capabilities; nothing handles it for now */ 615 case IEEE80211_ELEMID_EXTCAP: 616 break; 617 case IEEE80211_ELEMID_VENDOR: 618 if (iswpaoui(frm)) 619 scan->wpa = frm; 620 else if (iswmeparam(frm) || iswmeinfo(frm)) 621 scan->wme = frm; 622 #ifdef IEEE80211_SUPPORT_SUPERG 623 else if (isatherosoui(frm)) 624 scan->ath = frm; 625 #endif 626 #ifdef IEEE80211_SUPPORT_TDMA 627 else if (istdmaoui(frm)) 628 scan->tdma = frm; 629 #endif 630 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 631 /* 632 * Accept pre-draft HT ie's if the 633 * standard ones have not been seen. 634 */ 635 if (ishtcapoui(frm)) { 636 if (scan->htcap == NULL) 637 scan->htcap = frm; 638 } else if (ishtinfooui(frm)) { 639 if (scan->htinfo == NULL) 640 scan->htcap = frm; 641 } 642 } 643 break; 644 default: 645 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 646 wh, "unhandled", 647 "id %u, len %u", *frm, frm[1]); 648 vap->iv_stats.is_rx_elem_unknown++; 649 break; 650 } 651 frm += frm[1] + 2; 652 } 653 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 654 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 655 if (scan->rates != NULL && scan->xrates != NULL) { 656 /* 657 * NB: don't process XRATES if RATES is missing. This 658 * avoids a potential null ptr deref and should be ok 659 * as the return code will already note RATES is missing 660 * (so callers shouldn't otherwise process the frame). 661 */ 662 IEEE80211_VERIFY_ELEMENT(scan->xrates, 663 IEEE80211_RATE_MAXSIZE - scan->rates[1], 664 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 665 } 666 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 667 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 668 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 669 /* 670 * Frame was received on a channel different from the 671 * one indicated in the DS params element id; 672 * silently discard it. 673 * 674 * NB: this can happen due to signal leakage. 675 * But we should take it for FH phy because 676 * the rssi value should be correct even for 677 * different hop pattern in FH. 678 */ 679 IEEE80211_DISCARD(vap, 680 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 681 wh, NULL, "for off-channel %u (bchan=%u)", 682 scan->chan, scan->bchan); 683 vap->iv_stats.is_rx_chanmismatch++; 684 scan->status |= IEEE80211_BPARSE_OFFCHAN; 685 } 686 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 687 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 688 IEEE80211_DISCARD(vap, 689 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 690 wh, NULL, "bogus beacon interval (%d TU)", 691 (int) scan->bintval); 692 vap->iv_stats.is_rx_badbintval++; 693 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 694 } 695 if (scan->country != NULL) { 696 /* 697 * Validate we have at least enough data to extract 698 * the country code. Not sure if we should return an 699 * error instead of discarding the IE; consider this 700 * being lenient as we don't depend on the data for 701 * correct operation. 702 */ 703 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 704 scan->country = NULL); 705 } 706 if (scan->csa != NULL) { 707 /* 708 * Validate Channel Switch Announcement; this must 709 * be the correct length or we toss the frame. 710 */ 711 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 712 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 713 } 714 /* 715 * Process HT ie's. This is complicated by our 716 * accepting both the standard ie's and the pre-draft 717 * vendor OUI ie's that some vendors still use/require. 718 */ 719 if (scan->htcap != NULL) { 720 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 721 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 722 4 + sizeof(struct ieee80211_ie_htcap)-2 : 723 sizeof(struct ieee80211_ie_htcap)-2, 724 scan->htcap = NULL); 725 } 726 if (scan->htinfo != NULL) { 727 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 728 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 729 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 730 sizeof(struct ieee80211_ie_htinfo)-2, 731 scan->htinfo = NULL); 732 } 733 734 /* Process VHT IEs */ 735 if (scan->vhtcap != NULL) { 736 IEEE80211_VERIFY_LENGTH(scan->vhtcap[1], 737 sizeof(struct ieee80211_ie_vhtcap) - 2, 738 scan->vhtcap = NULL); 739 } 740 if (scan->vhtopmode != NULL) { 741 IEEE80211_VERIFY_LENGTH(scan->vhtopmode[1], 742 sizeof(struct ieee80211_ie_vht_operation) - 2, 743 scan->vhtopmode = NULL); 744 } 745 746 return scan->status; 747 } 748 749 /* 750 * Parse an Action frame. Return 0 on success, non-zero on failure. 751 */ 752 int 753 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 754 { 755 struct ieee80211vap *vap = ni->ni_vap; 756 const struct ieee80211_action *ia; 757 struct ieee80211_frame *wh; 758 uint8_t *frm, *efrm; 759 760 /* 761 * action frame format: 762 * [1] category 763 * [1] action 764 * [tlv] parameters 765 */ 766 wh = mtod(m, struct ieee80211_frame *); 767 frm = (u_int8_t *)&wh[1]; 768 efrm = mtod(m, u_int8_t *) + m->m_len; 769 IEEE80211_VERIFY_LENGTH(efrm - frm, 770 sizeof(struct ieee80211_action), return EINVAL); 771 ia = (const struct ieee80211_action *) frm; 772 773 vap->iv_stats.is_rx_action++; 774 IEEE80211_NODE_STAT(ni, rx_action); 775 776 /* verify frame payloads but defer processing */ 777 switch (ia->ia_category) { 778 case IEEE80211_ACTION_CAT_BA: 779 switch (ia->ia_action) { 780 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 781 IEEE80211_VERIFY_LENGTH(efrm - frm, 782 sizeof(struct ieee80211_action_ba_addbarequest), 783 return EINVAL); 784 break; 785 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 786 IEEE80211_VERIFY_LENGTH(efrm - frm, 787 sizeof(struct ieee80211_action_ba_addbaresponse), 788 return EINVAL); 789 break; 790 case IEEE80211_ACTION_BA_DELBA: 791 IEEE80211_VERIFY_LENGTH(efrm - frm, 792 sizeof(struct ieee80211_action_ba_delba), 793 return EINVAL); 794 break; 795 } 796 break; 797 case IEEE80211_ACTION_CAT_HT: 798 switch (ia->ia_action) { 799 case IEEE80211_ACTION_HT_TXCHWIDTH: 800 IEEE80211_VERIFY_LENGTH(efrm - frm, 801 sizeof(struct ieee80211_action_ht_txchwidth), 802 return EINVAL); 803 break; 804 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 805 IEEE80211_VERIFY_LENGTH(efrm - frm, 806 sizeof(struct ieee80211_action_ht_mimopowersave), 807 return EINVAL); 808 break; 809 } 810 break; 811 #ifdef IEEE80211_SUPPORT_MESH 812 case IEEE80211_ACTION_CAT_MESH: 813 switch (ia->ia_action) { 814 case IEEE80211_ACTION_MESH_LMETRIC: 815 /* 816 * XXX: verification is true only if we are using 817 * Airtime link metric (default) 818 */ 819 IEEE80211_VERIFY_LENGTH(efrm - frm, 820 sizeof(struct ieee80211_meshlmetric_ie), 821 return EINVAL); 822 break; 823 case IEEE80211_ACTION_MESH_HWMP: 824 /* verify something */ 825 break; 826 case IEEE80211_ACTION_MESH_GANN: 827 IEEE80211_VERIFY_LENGTH(efrm - frm, 828 sizeof(struct ieee80211_meshgann_ie), 829 return EINVAL); 830 break; 831 case IEEE80211_ACTION_MESH_CC: 832 case IEEE80211_ACTION_MESH_MCCA_SREQ: 833 case IEEE80211_ACTION_MESH_MCCA_SREP: 834 case IEEE80211_ACTION_MESH_MCCA_AREQ: 835 case IEEE80211_ACTION_MESH_MCCA_ADVER: 836 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 837 case IEEE80211_ACTION_MESH_TBTT_REQ: 838 case IEEE80211_ACTION_MESH_TBTT_RES: 839 /* reject these early on, not implemented */ 840 IEEE80211_DISCARD(vap, 841 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 842 wh, NULL, "not implemented yet, act=0x%02X", 843 ia->ia_action); 844 return EINVAL; 845 } 846 break; 847 case IEEE80211_ACTION_CAT_SELF_PROT: 848 /* If TA or RA group address discard silently */ 849 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 850 IEEE80211_IS_MULTICAST(wh->i_addr2)) 851 return EINVAL; 852 /* 853 * XXX: Should we verify complete length now or it is 854 * to varying in sizes? 855 */ 856 switch (ia->ia_action) { 857 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 858 case IEEE80211_ACTION_MESHPEERING_CLOSE: 859 /* is not a peering candidate (yet) */ 860 if (ni == vap->iv_bss) 861 return EINVAL; 862 break; 863 } 864 break; 865 #endif 866 case IEEE80211_ACTION_CAT_VHT: 867 printf("%s: TODO: VHT handling!\n", __func__); 868 break; 869 } 870 return 0; 871 } 872 873 #ifdef IEEE80211_DEBUG 874 /* 875 * Debugging support. 876 */ 877 void 878 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 879 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 880 { 881 printf("[%s] discard %s frame, ssid mismatch: ", 882 ether_sprintf(mac), tag); 883 ieee80211_print_essid(ssid + 2, ssid[1]); 884 printf("\n"); 885 } 886 887 /* 888 * Return the bssid of a frame. 889 */ 890 static const uint8_t * 891 ieee80211_getbssid(const struct ieee80211vap *vap, 892 const struct ieee80211_frame *wh) 893 { 894 if (vap->iv_opmode == IEEE80211_M_STA) 895 return wh->i_addr2; 896 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 897 return wh->i_addr1; 898 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 899 return wh->i_addr1; 900 return wh->i_addr3; 901 } 902 903 #include <machine/stdarg.h> 904 905 void 906 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 907 { 908 char buf[128]; /* XXX */ 909 va_list ap; 910 911 va_start(ap, fmt); 912 vsnprintf(buf, sizeof(buf), fmt, ap); 913 va_end(ap); 914 915 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 916 } 917 918 void 919 ieee80211_note_frame(const struct ieee80211vap *vap, 920 const struct ieee80211_frame *wh, 921 const char *fmt, ...) 922 { 923 char buf[128]; /* XXX */ 924 va_list ap; 925 926 va_start(ap, fmt); 927 vsnprintf(buf, sizeof(buf), fmt, ap); 928 va_end(ap); 929 if_printf(vap->iv_ifp, "[%s] %s\n", 930 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 931 } 932 933 void 934 ieee80211_note_mac(const struct ieee80211vap *vap, 935 const uint8_t mac[IEEE80211_ADDR_LEN], 936 const char *fmt, ...) 937 { 938 char buf[128]; /* XXX */ 939 va_list ap; 940 941 va_start(ap, fmt); 942 vsnprintf(buf, sizeof(buf), fmt, ap); 943 va_end(ap); 944 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 945 } 946 947 void 948 ieee80211_discard_frame(const struct ieee80211vap *vap, 949 const struct ieee80211_frame *wh, 950 const char *type, const char *fmt, ...) 951 { 952 va_list ap; 953 954 if_printf(vap->iv_ifp, "[%s] discard ", 955 ether_sprintf(ieee80211_getbssid(vap, wh))); 956 printf("%s frame, ", type != NULL ? type : 957 ieee80211_mgt_subtype_name(wh->i_fc[0])); 958 va_start(ap, fmt); 959 vprintf(fmt, ap); 960 va_end(ap); 961 printf("\n"); 962 } 963 964 void 965 ieee80211_discard_ie(const struct ieee80211vap *vap, 966 const struct ieee80211_frame *wh, 967 const char *type, const char *fmt, ...) 968 { 969 va_list ap; 970 971 if_printf(vap->iv_ifp, "[%s] discard ", 972 ether_sprintf(ieee80211_getbssid(vap, wh))); 973 if (type != NULL) 974 printf("%s information element, ", type); 975 else 976 printf("information element, "); 977 va_start(ap, fmt); 978 vprintf(fmt, ap); 979 va_end(ap); 980 printf("\n"); 981 } 982 983 void 984 ieee80211_discard_mac(const struct ieee80211vap *vap, 985 const uint8_t mac[IEEE80211_ADDR_LEN], 986 const char *type, const char *fmt, ...) 987 { 988 va_list ap; 989 990 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 991 if (type != NULL) 992 printf("%s frame, ", type); 993 else 994 printf("frame, "); 995 va_start(ap, fmt); 996 vprintf(fmt, ap); 997 va_end(ap); 998 printf("\n"); 999 } 1000 #endif /* IEEE80211_DEBUG */
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