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