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sys/net80211/ieee80211_input.c
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1 /*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: releng/11.0/sys/net80211/ieee80211_input.c 300910 2016-05-28 18:49:17Z avos $"); 29 30 #include "opt_wlan.h" 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/mbuf.h> 35 #include <sys/malloc.h> 36 #include <sys/endian.h> 37 #include <sys/kernel.h> 38 39 #include <sys/socket.h> 40 41 #include <net/ethernet.h> 42 #include <net/if.h> 43 #include <net/if_var.h> 44 #include <net/if_llc.h> 45 #include <net/if_media.h> 46 #include <net/if_vlan_var.h> 47 48 #include <net80211/ieee80211_var.h> 49 #include <net80211/ieee80211_input.h> 50 #ifdef IEEE80211_SUPPORT_MESH 51 #include <net80211/ieee80211_mesh.h> 52 #endif 53 54 #include <net/bpf.h> 55 56 #ifdef INET 57 #include <netinet/in.h> 58 #include <net/ethernet.h> 59 #endif 60 61 static void 62 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx) 63 { 64 int i; 65 66 /* Verify the required MIMO bits are set */ 67 if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) != 68 (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) 69 return; 70 71 /* XXX This assumes the MIMO radios have both ctl and ext chains */ 72 for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) { 73 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]); 74 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]); 75 } 76 77 /* XXX This also assumes the MIMO radios have both ctl and ext chains */ 78 for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) { 79 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i]; 80 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i]; 81 } 82 ni->ni_mimo_chains = rx->c_chain; 83 } 84 85 int 86 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m, 87 struct ieee80211_rx_stats *rx) 88 { 89 struct ieee80211_rx_stats rxs; 90 91 if (rx) { 92 memcpy(&rxs, rx, sizeof(*rx)); 93 } else { 94 /* try to read from mbuf */ 95 bzero(&rxs, sizeof(rxs)); 96 ieee80211_get_rx_params(m, &rxs); 97 } 98 99 /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */ 100 ieee80211_process_mimo(ni, &rxs); 101 102 //return ieee80211_input(ni, m, rx->rssi, rx->nf); 103 return ni->ni_vap->iv_input(ni, m, &rxs, rxs.rssi, rxs.nf); 104 } 105 106 int 107 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf) 108 { 109 struct ieee80211_rx_stats rx; 110 111 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI; 112 rx.nf = nf; 113 rx.rssi = rssi; 114 return ieee80211_input_mimo_all(ic, m, &rx); 115 } 116 117 int 118 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m, 119 struct ieee80211_rx_stats *rx) 120 { 121 struct ieee80211_rx_stats rxs; 122 struct ieee80211vap *vap; 123 int type = -1; 124 125 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */ 126 127 if (rx) { 128 memcpy(&rxs, rx, sizeof(*rx)); 129 } else { 130 /* try to read from mbuf */ 131 bzero(&rxs, sizeof(rxs)); 132 ieee80211_get_rx_params(m, &rxs); 133 } 134 135 /* XXX locking */ 136 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 137 struct ieee80211_node *ni; 138 struct mbuf *mcopy; 139 140 /* NB: could check for IFF_UP but this is cheaper */ 141 if (vap->iv_state == IEEE80211_S_INIT) 142 continue; 143 /* 144 * WDS vap's only receive directed traffic from the 145 * station at the ``far end''. That traffic should 146 * be passed through the AP vap the station is associated 147 * to--so don't spam them with mcast frames. 148 */ 149 if (vap->iv_opmode == IEEE80211_M_WDS) 150 continue; 151 if (TAILQ_NEXT(vap, iv_next) != NULL) { 152 /* 153 * Packet contents are changed by ieee80211_decap 154 * so do a deep copy of the packet. 155 */ 156 mcopy = m_dup(m, M_NOWAIT); 157 if (mcopy == NULL) { 158 /* XXX stat+msg */ 159 continue; 160 } 161 } else { 162 mcopy = m; 163 m = NULL; 164 } 165 ni = ieee80211_ref_node(vap->iv_bss); 166 type = ieee80211_input_mimo(ni, mcopy, &rxs); 167 ieee80211_free_node(ni); 168 } 169 if (m != NULL) /* no vaps, reclaim mbuf */ 170 m_freem(m); 171 return type; 172 } 173 174 /* 175 * This function reassembles fragments. 176 * 177 * XXX should handle 3 concurrent reassemblies per-spec. 178 */ 179 struct mbuf * 180 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace) 181 { 182 struct ieee80211vap *vap = ni->ni_vap; 183 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 184 struct ieee80211_frame *lwh; 185 uint16_t rxseq; 186 uint8_t fragno; 187 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 188 struct mbuf *mfrag; 189 190 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 191 192 rxseq = le16toh(*(uint16_t *)wh->i_seq); 193 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 194 195 /* Quick way out, if there's nothing to defragment */ 196 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 197 return m; 198 199 /* 200 * Remove frag to insure it doesn't get reaped by timer. 201 */ 202 if (ni->ni_table == NULL) { 203 /* 204 * Should never happen. If the node is orphaned (not in 205 * the table) then input packets should not reach here. 206 * Otherwise, a concurrent request that yanks the table 207 * should be blocked by other interlocking and/or by first 208 * shutting the driver down. Regardless, be defensive 209 * here and just bail 210 */ 211 /* XXX need msg+stat */ 212 m_freem(m); 213 return NULL; 214 } 215 IEEE80211_NODE_LOCK(ni->ni_table); 216 mfrag = ni->ni_rxfrag[0]; 217 ni->ni_rxfrag[0] = NULL; 218 IEEE80211_NODE_UNLOCK(ni->ni_table); 219 220 /* 221 * Validate new fragment is in order and 222 * related to the previous ones. 223 */ 224 if (mfrag != NULL) { 225 uint16_t last_rxseq; 226 227 lwh = mtod(mfrag, struct ieee80211_frame *); 228 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 229 /* NB: check seq # and frag together */ 230 if (rxseq == last_rxseq+1 && 231 IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) && 232 IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 233 /* XXX clear MORE_FRAG bit? */ 234 /* track last seqnum and fragno */ 235 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 236 237 m_adj(m, hdrspace); /* strip header */ 238 m_catpkt(mfrag, m); /* concatenate */ 239 } else { 240 /* 241 * Unrelated fragment or no space for it, 242 * clear current fragments. 243 */ 244 m_freem(mfrag); 245 mfrag = NULL; 246 } 247 } 248 249 if (mfrag == NULL) { 250 if (fragno != 0) { /* !first fragment, discard */ 251 vap->iv_stats.is_rx_defrag++; 252 IEEE80211_NODE_STAT(ni, rx_defrag); 253 m_freem(m); 254 return NULL; 255 } 256 mfrag = m; 257 } 258 if (more_frag) { /* more to come, save */ 259 ni->ni_rxfragstamp = ticks; 260 ni->ni_rxfrag[0] = mfrag; 261 mfrag = NULL; 262 } 263 return mfrag; 264 } 265 266 void 267 ieee80211_deliver_data(struct ieee80211vap *vap, 268 struct ieee80211_node *ni, struct mbuf *m) 269 { 270 struct ether_header *eh = mtod(m, struct ether_header *); 271 struct ifnet *ifp = vap->iv_ifp; 272 273 /* clear driver/net80211 flags before passing up */ 274 m->m_flags &= ~(M_MCAST | M_BCAST); 275 m_clrprotoflags(m); 276 277 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 278 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 279 /* 280 * Do accounting. 281 */ 282 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 283 IEEE80211_NODE_STAT(ni, rx_data); 284 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 285 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 286 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 287 IEEE80211_NODE_STAT(ni, rx_mcast); 288 } else 289 IEEE80211_NODE_STAT(ni, rx_ucast); 290 m->m_pkthdr.rcvif = ifp; 291 292 if (ni->ni_vlan != 0) { 293 /* attach vlan tag */ 294 m->m_pkthdr.ether_vtag = ni->ni_vlan; 295 m->m_flags |= M_VLANTAG; 296 } 297 ifp->if_input(ifp, m); 298 } 299 300 struct mbuf * 301 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 302 { 303 struct ieee80211_qosframe_addr4 wh; 304 struct ether_header *eh; 305 struct llc *llc; 306 307 KASSERT(hdrlen <= sizeof(wh), 308 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 309 310 if (m->m_len < hdrlen + sizeof(*llc) && 311 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 312 vap->iv_stats.is_rx_tooshort++; 313 /* XXX msg */ 314 return NULL; 315 } 316 memcpy(&wh, mtod(m, caddr_t), hdrlen); 317 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 318 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 319 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 320 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 321 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 322 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 323 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 324 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 325 llc = NULL; 326 } else { 327 m_adj(m, hdrlen - sizeof(*eh)); 328 } 329 eh = mtod(m, struct ether_header *); 330 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 331 case IEEE80211_FC1_DIR_NODS: 332 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 333 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 334 break; 335 case IEEE80211_FC1_DIR_TODS: 336 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 337 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 338 break; 339 case IEEE80211_FC1_DIR_FROMDS: 340 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 341 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 342 break; 343 case IEEE80211_FC1_DIR_DSTODS: 344 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 345 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 346 break; 347 } 348 #ifndef __NO_STRICT_ALIGNMENT 349 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 350 m = ieee80211_realign(vap, m, sizeof(*eh)); 351 if (m == NULL) 352 return NULL; 353 } 354 #endif /* !__NO_STRICT_ALIGNMENT */ 355 if (llc != NULL) { 356 eh = mtod(m, struct ether_header *); 357 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 358 } 359 return m; 360 } 361 362 /* 363 * Decap a frame encapsulated in a fast-frame/A-MSDU. 364 */ 365 struct mbuf * 366 ieee80211_decap1(struct mbuf *m, int *framelen) 367 { 368 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 369 struct ether_header *eh; 370 struct llc *llc; 371 372 /* 373 * The frame has an 802.3 header followed by an 802.2 374 * LLC header. The encapsulated frame length is in the 375 * first header type field; save that and overwrite it 376 * with the true type field found in the second. Then 377 * copy the 802.3 header up to where it belongs and 378 * adjust the mbuf contents to remove the void. 379 */ 380 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 381 return NULL; 382 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 383 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 384 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 385 + sizeof(struct ether_header) - sizeof(struct llc); 386 eh->ether_type = llc->llc_un.type_snap.ether_type; 387 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 388 sizeof(struct ether_header)); 389 m_adj(m, sizeof(struct llc)); 390 return m; 391 #undef FF_LLC_SIZE 392 } 393 394 /* 395 * Install received rate set information in the node's state block. 396 */ 397 int 398 ieee80211_setup_rates(struct ieee80211_node *ni, 399 const uint8_t *rates, const uint8_t *xrates, int flags) 400 { 401 struct ieee80211vap *vap = ni->ni_vap; 402 struct ieee80211_rateset *rs = &ni->ni_rates; 403 404 memset(rs, 0, sizeof(*rs)); 405 rs->rs_nrates = rates[1]; 406 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 407 if (xrates != NULL) { 408 uint8_t nxrates; 409 /* 410 * Tack on 11g extended supported rate element. 411 */ 412 nxrates = xrates[1]; 413 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 414 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 415 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 416 "extended rate set too large; only using " 417 "%u of %u rates", nxrates, xrates[1]); 418 vap->iv_stats.is_rx_rstoobig++; 419 } 420 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 421 rs->rs_nrates += nxrates; 422 } 423 return ieee80211_fix_rate(ni, rs, flags); 424 } 425 426 /* 427 * Send a management frame error response to the specified 428 * station. If ni is associated with the station then use 429 * it; otherwise allocate a temporary node suitable for 430 * transmitting the frame and then free the reference so 431 * it will go away as soon as the frame has been transmitted. 432 */ 433 void 434 ieee80211_send_error(struct ieee80211_node *ni, 435 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 436 { 437 struct ieee80211vap *vap = ni->ni_vap; 438 int istmp; 439 440 if (ni == vap->iv_bss) { 441 if (vap->iv_state != IEEE80211_S_RUN) { 442 /* 443 * XXX hack until we get rid of this routine. 444 * We can be called prior to the vap reaching 445 * run state under certain conditions in which 446 * case iv_bss->ni_chan will not be setup. 447 * Check for this explicitly and and just ignore 448 * the request. 449 */ 450 return; 451 } 452 ni = ieee80211_tmp_node(vap, mac); 453 if (ni == NULL) { 454 /* XXX msg */ 455 return; 456 } 457 istmp = 1; 458 } else 459 istmp = 0; 460 IEEE80211_SEND_MGMT(ni, subtype, arg); 461 if (istmp) 462 ieee80211_free_node(ni); 463 } 464 465 int 466 ieee80211_alloc_challenge(struct ieee80211_node *ni) 467 { 468 if (ni->ni_challenge == NULL) 469 ni->ni_challenge = (uint32_t *) 470 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN, 471 M_80211_NODE, IEEE80211_M_NOWAIT); 472 if (ni->ni_challenge == NULL) { 473 IEEE80211_NOTE(ni->ni_vap, 474 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 475 "%s", "shared key challenge alloc failed"); 476 /* XXX statistic */ 477 } 478 return (ni->ni_challenge != NULL); 479 } 480 481 /* 482 * Parse a Beacon or ProbeResponse frame and return the 483 * useful information in an ieee80211_scanparams structure. 484 * Status is set to 0 if no problems were found; otherwise 485 * a bitmask of IEEE80211_BPARSE_* items is returned that 486 * describes the problems detected. 487 */ 488 int 489 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 490 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan) 491 { 492 struct ieee80211vap *vap = ni->ni_vap; 493 struct ieee80211com *ic = ni->ni_ic; 494 struct ieee80211_frame *wh; 495 uint8_t *frm, *efrm; 496 497 wh = mtod(m, struct ieee80211_frame *); 498 frm = (uint8_t *)&wh[1]; 499 efrm = mtod(m, uint8_t *) + m->m_len; 500 scan->status = 0; 501 /* 502 * beacon/probe response frame format 503 * [8] time stamp 504 * [2] beacon interval 505 * [2] capability information 506 * [tlv] ssid 507 * [tlv] supported rates 508 * [tlv] country information 509 * [tlv] channel switch announcement (CSA) 510 * [tlv] parameter set (FH/DS) 511 * [tlv] erp information 512 * [tlv] extended supported rates 513 * [tlv] WME 514 * [tlv] WPA or RSN 515 * [tlv] HT capabilities 516 * [tlv] HT 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_RSN: 595 scan->rsn = frm; 596 break; 597 case IEEE80211_ELEMID_HTINFO: 598 scan->htinfo = frm; 599 break; 600 #ifdef IEEE80211_SUPPORT_MESH 601 case IEEE80211_ELEMID_MESHID: 602 scan->meshid = frm; 603 break; 604 case IEEE80211_ELEMID_MESHCONF: 605 scan->meshconf = frm; 606 break; 607 #endif 608 /* Extended capabilities; nothing handles it for now */ 609 case IEEE80211_ELEMID_EXTCAP: 610 break; 611 case IEEE80211_ELEMID_VENDOR: 612 if (iswpaoui(frm)) 613 scan->wpa = frm; 614 else if (iswmeparam(frm) || iswmeinfo(frm)) 615 scan->wme = frm; 616 #ifdef IEEE80211_SUPPORT_SUPERG 617 else if (isatherosoui(frm)) 618 scan->ath = frm; 619 #endif 620 #ifdef IEEE80211_SUPPORT_TDMA 621 else if (istdmaoui(frm)) 622 scan->tdma = frm; 623 #endif 624 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 625 /* 626 * Accept pre-draft HT ie's if the 627 * standard ones have not been seen. 628 */ 629 if (ishtcapoui(frm)) { 630 if (scan->htcap == NULL) 631 scan->htcap = frm; 632 } else if (ishtinfooui(frm)) { 633 if (scan->htinfo == NULL) 634 scan->htcap = frm; 635 } 636 } 637 break; 638 default: 639 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 640 wh, "unhandled", 641 "id %u, len %u", *frm, frm[1]); 642 vap->iv_stats.is_rx_elem_unknown++; 643 break; 644 } 645 frm += frm[1] + 2; 646 } 647 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 648 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 649 if (scan->rates != NULL && scan->xrates != NULL) { 650 /* 651 * NB: don't process XRATES if RATES is missing. This 652 * avoids a potential null ptr deref and should be ok 653 * as the return code will already note RATES is missing 654 * (so callers shouldn't otherwise process the frame). 655 */ 656 IEEE80211_VERIFY_ELEMENT(scan->xrates, 657 IEEE80211_RATE_MAXSIZE - scan->rates[1], 658 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 659 } 660 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 661 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 662 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 663 /* 664 * Frame was received on a channel different from the 665 * one indicated in the DS params element id; 666 * silently discard it. 667 * 668 * NB: this can happen due to signal leakage. 669 * But we should take it for FH phy because 670 * the rssi value should be correct even for 671 * different hop pattern in FH. 672 */ 673 IEEE80211_DISCARD(vap, 674 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 675 wh, NULL, "for off-channel %u (bchan=%u)", 676 scan->chan, scan->bchan); 677 vap->iv_stats.is_rx_chanmismatch++; 678 scan->status |= IEEE80211_BPARSE_OFFCHAN; 679 } 680 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 681 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 682 IEEE80211_DISCARD(vap, 683 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 684 wh, NULL, "bogus beacon interval (%d TU)", 685 (int) scan->bintval); 686 vap->iv_stats.is_rx_badbintval++; 687 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 688 } 689 if (scan->country != NULL) { 690 /* 691 * Validate we have at least enough data to extract 692 * the country code. Not sure if we should return an 693 * error instead of discarding the IE; consider this 694 * being lenient as we don't depend on the data for 695 * correct operation. 696 */ 697 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 698 scan->country = NULL); 699 } 700 if (scan->csa != NULL) { 701 /* 702 * Validate Channel Switch Announcement; this must 703 * be the correct length or we toss the frame. 704 */ 705 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 706 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 707 } 708 /* 709 * Process HT ie's. This is complicated by our 710 * accepting both the standard ie's and the pre-draft 711 * vendor OUI ie's that some vendors still use/require. 712 */ 713 if (scan->htcap != NULL) { 714 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 715 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 716 4 + sizeof(struct ieee80211_ie_htcap)-2 : 717 sizeof(struct ieee80211_ie_htcap)-2, 718 scan->htcap = NULL); 719 } 720 if (scan->htinfo != NULL) { 721 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 722 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 723 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 724 sizeof(struct ieee80211_ie_htinfo)-2, 725 scan->htinfo = NULL); 726 } 727 return scan->status; 728 } 729 730 /* 731 * Parse an Action frame. Return 0 on success, non-zero on failure. 732 */ 733 int 734 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 735 { 736 struct ieee80211vap *vap = ni->ni_vap; 737 const struct ieee80211_action *ia; 738 struct ieee80211_frame *wh; 739 uint8_t *frm, *efrm; 740 741 /* 742 * action frame format: 743 * [1] category 744 * [1] action 745 * [tlv] parameters 746 */ 747 wh = mtod(m, struct ieee80211_frame *); 748 frm = (u_int8_t *)&wh[1]; 749 efrm = mtod(m, u_int8_t *) + m->m_len; 750 IEEE80211_VERIFY_LENGTH(efrm - frm, 751 sizeof(struct ieee80211_action), return EINVAL); 752 ia = (const struct ieee80211_action *) frm; 753 754 vap->iv_stats.is_rx_action++; 755 IEEE80211_NODE_STAT(ni, rx_action); 756 757 /* verify frame payloads but defer processing */ 758 switch (ia->ia_category) { 759 case IEEE80211_ACTION_CAT_BA: 760 switch (ia->ia_action) { 761 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 762 IEEE80211_VERIFY_LENGTH(efrm - frm, 763 sizeof(struct ieee80211_action_ba_addbarequest), 764 return EINVAL); 765 break; 766 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 767 IEEE80211_VERIFY_LENGTH(efrm - frm, 768 sizeof(struct ieee80211_action_ba_addbaresponse), 769 return EINVAL); 770 break; 771 case IEEE80211_ACTION_BA_DELBA: 772 IEEE80211_VERIFY_LENGTH(efrm - frm, 773 sizeof(struct ieee80211_action_ba_delba), 774 return EINVAL); 775 break; 776 } 777 break; 778 case IEEE80211_ACTION_CAT_HT: 779 switch (ia->ia_action) { 780 case IEEE80211_ACTION_HT_TXCHWIDTH: 781 IEEE80211_VERIFY_LENGTH(efrm - frm, 782 sizeof(struct ieee80211_action_ht_txchwidth), 783 return EINVAL); 784 break; 785 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 786 IEEE80211_VERIFY_LENGTH(efrm - frm, 787 sizeof(struct ieee80211_action_ht_mimopowersave), 788 return EINVAL); 789 break; 790 } 791 break; 792 #ifdef IEEE80211_SUPPORT_MESH 793 case IEEE80211_ACTION_CAT_MESH: 794 switch (ia->ia_action) { 795 case IEEE80211_ACTION_MESH_LMETRIC: 796 /* 797 * XXX: verification is true only if we are using 798 * Airtime link metric (default) 799 */ 800 IEEE80211_VERIFY_LENGTH(efrm - frm, 801 sizeof(struct ieee80211_meshlmetric_ie), 802 return EINVAL); 803 break; 804 case IEEE80211_ACTION_MESH_HWMP: 805 /* verify something */ 806 break; 807 case IEEE80211_ACTION_MESH_GANN: 808 IEEE80211_VERIFY_LENGTH(efrm - frm, 809 sizeof(struct ieee80211_meshgann_ie), 810 return EINVAL); 811 break; 812 case IEEE80211_ACTION_MESH_CC: 813 case IEEE80211_ACTION_MESH_MCCA_SREQ: 814 case IEEE80211_ACTION_MESH_MCCA_SREP: 815 case IEEE80211_ACTION_MESH_MCCA_AREQ: 816 case IEEE80211_ACTION_MESH_MCCA_ADVER: 817 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 818 case IEEE80211_ACTION_MESH_TBTT_REQ: 819 case IEEE80211_ACTION_MESH_TBTT_RES: 820 /* reject these early on, not implemented */ 821 IEEE80211_DISCARD(vap, 822 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 823 wh, NULL, "not implemented yet, act=0x%02X", 824 ia->ia_action); 825 return EINVAL; 826 } 827 break; 828 case IEEE80211_ACTION_CAT_SELF_PROT: 829 /* If TA or RA group address discard silently */ 830 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 831 IEEE80211_IS_MULTICAST(wh->i_addr2)) 832 return EINVAL; 833 /* 834 * XXX: Should we verify complete length now or it is 835 * to varying in sizes? 836 */ 837 switch (ia->ia_action) { 838 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 839 case IEEE80211_ACTION_MESHPEERING_CLOSE: 840 /* is not a peering candidate (yet) */ 841 if (ni == vap->iv_bss) 842 return EINVAL; 843 break; 844 } 845 break; 846 #endif 847 } 848 return 0; 849 } 850 851 #ifdef IEEE80211_DEBUG 852 /* 853 * Debugging support. 854 */ 855 void 856 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 857 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 858 { 859 printf("[%s] discard %s frame, ssid mismatch: ", 860 ether_sprintf(mac), tag); 861 ieee80211_print_essid(ssid + 2, ssid[1]); 862 printf("\n"); 863 } 864 865 /* 866 * Return the bssid of a frame. 867 */ 868 static const uint8_t * 869 ieee80211_getbssid(const struct ieee80211vap *vap, 870 const struct ieee80211_frame *wh) 871 { 872 if (vap->iv_opmode == IEEE80211_M_STA) 873 return wh->i_addr2; 874 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 875 return wh->i_addr1; 876 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 877 return wh->i_addr1; 878 return wh->i_addr3; 879 } 880 881 #include <machine/stdarg.h> 882 883 void 884 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 885 { 886 char buf[128]; /* XXX */ 887 va_list ap; 888 889 va_start(ap, fmt); 890 vsnprintf(buf, sizeof(buf), fmt, ap); 891 va_end(ap); 892 893 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 894 } 895 896 void 897 ieee80211_note_frame(const struct ieee80211vap *vap, 898 const struct ieee80211_frame *wh, 899 const char *fmt, ...) 900 { 901 char buf[128]; /* XXX */ 902 va_list ap; 903 904 va_start(ap, fmt); 905 vsnprintf(buf, sizeof(buf), fmt, ap); 906 va_end(ap); 907 if_printf(vap->iv_ifp, "[%s] %s\n", 908 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 909 } 910 911 void 912 ieee80211_note_mac(const struct ieee80211vap *vap, 913 const uint8_t mac[IEEE80211_ADDR_LEN], 914 const char *fmt, ...) 915 { 916 char buf[128]; /* XXX */ 917 va_list ap; 918 919 va_start(ap, fmt); 920 vsnprintf(buf, sizeof(buf), fmt, ap); 921 va_end(ap); 922 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 923 } 924 925 void 926 ieee80211_discard_frame(const struct ieee80211vap *vap, 927 const struct ieee80211_frame *wh, 928 const char *type, const char *fmt, ...) 929 { 930 va_list ap; 931 932 if_printf(vap->iv_ifp, "[%s] discard ", 933 ether_sprintf(ieee80211_getbssid(vap, wh))); 934 printf("%s frame, ", type != NULL ? type : 935 ieee80211_mgt_subtype_name(wh->i_fc[0])); 936 va_start(ap, fmt); 937 vprintf(fmt, ap); 938 va_end(ap); 939 printf("\n"); 940 } 941 942 void 943 ieee80211_discard_ie(const struct ieee80211vap *vap, 944 const struct ieee80211_frame *wh, 945 const char *type, const char *fmt, ...) 946 { 947 va_list ap; 948 949 if_printf(vap->iv_ifp, "[%s] discard ", 950 ether_sprintf(ieee80211_getbssid(vap, wh))); 951 if (type != NULL) 952 printf("%s information element, ", type); 953 else 954 printf("information element, "); 955 va_start(ap, fmt); 956 vprintf(fmt, ap); 957 va_end(ap); 958 printf("\n"); 959 } 960 961 void 962 ieee80211_discard_mac(const struct ieee80211vap *vap, 963 const uint8_t mac[IEEE80211_ADDR_LEN], 964 const char *type, const char *fmt, ...) 965 { 966 va_list ap; 967 968 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 969 if (type != NULL) 970 printf("%s frame, ", type); 971 else 972 printf("frame, "); 973 va_start(ap, fmt); 974 vprintf(fmt, ap); 975 va_end(ap); 976 printf("\n"); 977 } 978 #endif /* IEEE80211_DEBUG */
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