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