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 { 88 struct ieee80211_rx_stats rxs; 89 90 /* try to read stats from mbuf */ 91 bzero(&rxs, sizeof(rxs)); 92 if (ieee80211_get_rx_params(m, &rxs) != 0) 93 return (-1); 94 95 /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */ 96 ieee80211_process_mimo(ni, &rxs); 97 98 //return ieee80211_input(ni, m, rx->rssi, rx->nf); 99 return ni->ni_vap->iv_input(ni, m, &rxs, rxs.c_rssi, rxs.c_nf); 100 } 101 102 int 103 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf) 104 { 105 struct ieee80211_rx_stats rx; 106 107 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI; 108 rx.c_nf = nf; 109 rx.c_rssi = rssi; 110 111 if (!ieee80211_add_rx_params(m, &rx)) 112 return (-1); 113 114 return ieee80211_input_mimo_all(ic, m); 115 } 116 117 int 118 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m) 119 { 120 struct ieee80211vap *vap; 121 int type = -1; 122 123 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */ 124 125 /* XXX locking */ 126 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 127 struct ieee80211_node *ni; 128 struct mbuf *mcopy; 129 130 /* NB: could check for IFF_UP but this is cheaper */ 131 if (vap->iv_state == IEEE80211_S_INIT) 132 continue; 133 /* 134 * WDS vap's only receive directed traffic from the 135 * station at the ``far end''. That traffic should 136 * be passed through the AP vap the station is associated 137 * to--so don't spam them with mcast frames. 138 */ 139 if (vap->iv_opmode == IEEE80211_M_WDS) 140 continue; 141 if (TAILQ_NEXT(vap, iv_next) != NULL) { 142 /* 143 * Packet contents are changed by ieee80211_decap 144 * so do a deep copy of the packet. 145 * NB: tags are copied too. 146 */ 147 mcopy = m_dup(m, M_NOWAIT); 148 if (mcopy == NULL) { 149 /* XXX stat+msg */ 150 continue; 151 } 152 } else { 153 mcopy = m; 154 m = NULL; 155 } 156 ni = ieee80211_ref_node(vap->iv_bss); 157 type = ieee80211_input_mimo(ni, mcopy); 158 ieee80211_free_node(ni); 159 } 160 if (m != NULL) /* no vaps, reclaim mbuf */ 161 m_freem(m); 162 return type; 163 } 164 165 /* 166 * This function reassembles fragments. 167 * 168 * XXX should handle 3 concurrent reassemblies per-spec. 169 */ 170 struct mbuf * 171 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace) 172 { 173 struct ieee80211vap *vap = ni->ni_vap; 174 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 175 struct ieee80211_frame *lwh; 176 uint16_t rxseq; 177 uint8_t fragno; 178 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 179 struct mbuf *mfrag; 180 181 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 182 183 rxseq = le16toh(*(uint16_t *)wh->i_seq); 184 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 185 186 /* Quick way out, if there's nothing to defragment */ 187 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 188 return m; 189 190 /* 191 * Remove frag to insure it doesn't get reaped by timer. 192 */ 193 if (ni->ni_table == NULL) { 194 /* 195 * Should never happen. If the node is orphaned (not in 196 * the table) then input packets should not reach here. 197 * Otherwise, a concurrent request that yanks the table 198 * should be blocked by other interlocking and/or by first 199 * shutting the driver down. Regardless, be defensive 200 * here and just bail 201 */ 202 /* XXX need msg+stat */ 203 m_freem(m); 204 return NULL; 205 } 206 IEEE80211_NODE_LOCK(ni->ni_table); 207 mfrag = ni->ni_rxfrag[0]; 208 ni->ni_rxfrag[0] = NULL; 209 IEEE80211_NODE_UNLOCK(ni->ni_table); 210 211 /* 212 * Validate new fragment is in order and 213 * related to the previous ones. 214 */ 215 if (mfrag != NULL) { 216 uint16_t last_rxseq; 217 218 lwh = mtod(mfrag, struct ieee80211_frame *); 219 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 220 /* NB: check seq # and frag together */ 221 if (rxseq == last_rxseq+1 && 222 IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) && 223 IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 224 /* XXX clear MORE_FRAG bit? */ 225 /* track last seqnum and fragno */ 226 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 227 228 m_adj(m, hdrspace); /* strip header */ 229 m_catpkt(mfrag, m); /* concatenate */ 230 } else { 231 /* 232 * Unrelated fragment or no space for it, 233 * clear current fragments. 234 */ 235 m_freem(mfrag); 236 mfrag = NULL; 237 } 238 } 239 240 if (mfrag == NULL) { 241 if (fragno != 0) { /* !first fragment, discard */ 242 vap->iv_stats.is_rx_defrag++; 243 IEEE80211_NODE_STAT(ni, rx_defrag); 244 m_freem(m); 245 return NULL; 246 } 247 mfrag = m; 248 } 249 if (more_frag) { /* more to come, save */ 250 ni->ni_rxfragstamp = ticks; 251 ni->ni_rxfrag[0] = mfrag; 252 mfrag = NULL; 253 } 254 return mfrag; 255 } 256 257 void 258 ieee80211_deliver_data(struct ieee80211vap *vap, 259 struct ieee80211_node *ni, struct mbuf *m) 260 { 261 struct ether_header *eh = mtod(m, struct ether_header *); 262 struct ifnet *ifp = vap->iv_ifp; 263 264 /* clear driver/net80211 flags before passing up */ 265 m->m_flags &= ~(M_MCAST | M_BCAST); 266 m_clrprotoflags(m); 267 268 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 269 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 270 /* 271 * Do accounting. 272 */ 273 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 274 IEEE80211_NODE_STAT(ni, rx_data); 275 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 276 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 277 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 278 m->m_flags |= M_BCAST; 279 else 280 m->m_flags |= M_MCAST; 281 IEEE80211_NODE_STAT(ni, rx_mcast); 282 } else 283 IEEE80211_NODE_STAT(ni, rx_ucast); 284 m->m_pkthdr.rcvif = ifp; 285 286 if (ni->ni_vlan != 0) { 287 /* attach vlan tag */ 288 m->m_pkthdr.ether_vtag = ni->ni_vlan; 289 m->m_flags |= M_VLANTAG; 290 } 291 ifp->if_input(ifp, m); 292 } 293 294 struct mbuf * 295 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 296 { 297 struct ieee80211_qosframe_addr4 wh; 298 struct ether_header *eh; 299 struct llc *llc; 300 301 KASSERT(hdrlen <= sizeof(wh), 302 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 303 304 if (m->m_len < hdrlen + sizeof(*llc) && 305 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 306 vap->iv_stats.is_rx_tooshort++; 307 /* XXX msg */ 308 return NULL; 309 } 310 memcpy(&wh, mtod(m, caddr_t), hdrlen); 311 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 312 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 313 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 314 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 315 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 316 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 317 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 318 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 319 llc = NULL; 320 } else { 321 m_adj(m, hdrlen - sizeof(*eh)); 322 } 323 eh = mtod(m, struct ether_header *); 324 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 325 case IEEE80211_FC1_DIR_NODS: 326 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 327 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 328 break; 329 case IEEE80211_FC1_DIR_TODS: 330 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 331 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 332 break; 333 case IEEE80211_FC1_DIR_FROMDS: 334 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 335 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 336 break; 337 case IEEE80211_FC1_DIR_DSTODS: 338 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 339 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 340 break; 341 } 342 #ifndef __NO_STRICT_ALIGNMENT 343 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 344 m = ieee80211_realign(vap, m, sizeof(*eh)); 345 if (m == NULL) 346 return NULL; 347 } 348 #endif /* !__NO_STRICT_ALIGNMENT */ 349 if (llc != NULL) { 350 eh = mtod(m, struct ether_header *); 351 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 352 } 353 return m; 354 } 355 356 /* 357 * Decap a frame encapsulated in a fast-frame/A-MSDU. 358 */ 359 struct mbuf * 360 ieee80211_decap1(struct mbuf *m, int *framelen) 361 { 362 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 363 struct ether_header *eh; 364 struct llc *llc; 365 366 /* 367 * The frame has an 802.3 header followed by an 802.2 368 * LLC header. The encapsulated frame length is in the 369 * first header type field; save that and overwrite it 370 * with the true type field found in the second. Then 371 * copy the 802.3 header up to where it belongs and 372 * adjust the mbuf contents to remove the void. 373 */ 374 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 375 return NULL; 376 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 377 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 378 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 379 + sizeof(struct ether_header) - sizeof(struct llc); 380 eh->ether_type = llc->llc_un.type_snap.ether_type; 381 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 382 sizeof(struct ether_header)); 383 m_adj(m, sizeof(struct llc)); 384 return m; 385 #undef FF_LLC_SIZE 386 } 387 388 /* 389 * Install received rate set information in the node's state block. 390 */ 391 int 392 ieee80211_setup_rates(struct ieee80211_node *ni, 393 const uint8_t *rates, const uint8_t *xrates, int flags) 394 { 395 struct ieee80211vap *vap = ni->ni_vap; 396 struct ieee80211_rateset *rs = &ni->ni_rates; 397 398 memset(rs, 0, sizeof(*rs)); 399 rs->rs_nrates = rates[1]; 400 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 401 if (xrates != NULL) { 402 uint8_t nxrates; 403 /* 404 * Tack on 11g extended supported rate element. 405 */ 406 nxrates = xrates[1]; 407 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 408 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 409 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 410 "extended rate set too large; only using " 411 "%u of %u rates", nxrates, xrates[1]); 412 vap->iv_stats.is_rx_rstoobig++; 413 } 414 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 415 rs->rs_nrates += nxrates; 416 } 417 return ieee80211_fix_rate(ni, rs, flags); 418 } 419 420 /* 421 * Send a management frame error response to the specified 422 * station. If ni is associated with the station then use 423 * it; otherwise allocate a temporary node suitable for 424 * transmitting the frame and then free the reference so 425 * it will go away as soon as the frame has been transmitted. 426 */ 427 void 428 ieee80211_send_error(struct ieee80211_node *ni, 429 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 430 { 431 struct ieee80211vap *vap = ni->ni_vap; 432 int istmp; 433 434 if (ni == vap->iv_bss) { 435 if (vap->iv_state != IEEE80211_S_RUN) { 436 /* 437 * XXX hack until we get rid of this routine. 438 * We can be called prior to the vap reaching 439 * run state under certain conditions in which 440 * case iv_bss->ni_chan will not be setup. 441 * Check for this explicitly and and just ignore 442 * the request. 443 */ 444 return; 445 } 446 ni = ieee80211_tmp_node(vap, mac); 447 if (ni == NULL) { 448 /* XXX msg */ 449 return; 450 } 451 istmp = 1; 452 } else 453 istmp = 0; 454 IEEE80211_SEND_MGMT(ni, subtype, arg); 455 if (istmp) 456 ieee80211_free_node(ni); 457 } 458 459 int 460 ieee80211_alloc_challenge(struct ieee80211_node *ni) 461 { 462 if (ni->ni_challenge == NULL) 463 ni->ni_challenge = (uint32_t *) 464 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN, 465 M_80211_NODE, IEEE80211_M_NOWAIT); 466 if (ni->ni_challenge == NULL) { 467 IEEE80211_NOTE(ni->ni_vap, 468 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 469 "%s", "shared key challenge alloc failed"); 470 /* XXX statistic */ 471 } 472 return (ni->ni_challenge != NULL); 473 } 474 475 /* 476 * Parse a Beacon or ProbeResponse frame and return the 477 * useful information in an ieee80211_scanparams structure. 478 * Status is set to 0 if no problems were found; otherwise 479 * a bitmask of IEEE80211_BPARSE_* items is returned that 480 * describes the problems detected. 481 */ 482 int 483 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 484 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan) 485 { 486 struct ieee80211vap *vap = ni->ni_vap; 487 struct ieee80211com *ic = ni->ni_ic; 488 struct ieee80211_frame *wh; 489 uint8_t *frm, *efrm; 490 491 wh = mtod(m, struct ieee80211_frame *); 492 frm = (uint8_t *)&wh[1]; 493 efrm = mtod(m, uint8_t *) + m->m_len; 494 scan->status = 0; 495 /* 496 * beacon/probe response frame format 497 * 498 * XXX Update from 802.11-2012 - eg where HT is 499 * [8] time stamp 500 * [2] beacon interval 501 * [2] capability information 502 * [tlv] ssid 503 * [tlv] supported rates 504 * [tlv] country information 505 * [tlv] channel switch announcement (CSA) 506 * [tlv] parameter set (FH/DS) 507 * [tlv] erp information 508 * [tlv] extended supported rates 509 * [tlv] WME 510 * [tlv] WPA or RSN 511 * [tlv] HT capabilities 512 * [tlv] HT information 513 * [tlv] VHT capabilities 514 * [tlv] VHT information 515 * [tlv] Atheros capabilities 516 * [tlv] Mesh ID 517 * [tlv] Mesh Configuration 518 */ 519 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 520 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 521 memset(scan, 0, sizeof(*scan)); 522 scan->tstamp = frm; frm += 8; 523 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 524 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 525 scan->bchan = ieee80211_chan2ieee(ic, rxchan); 526 scan->chan = scan->bchan; 527 scan->ies = frm; 528 scan->ies_len = efrm - frm; 529 530 while (efrm - frm > 1) { 531 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 532 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 533 switch (*frm) { 534 case IEEE80211_ELEMID_SSID: 535 scan->ssid = frm; 536 break; 537 case IEEE80211_ELEMID_RATES: 538 scan->rates = frm; 539 break; 540 case IEEE80211_ELEMID_COUNTRY: 541 scan->country = frm; 542 break; 543 case IEEE80211_ELEMID_CSA: 544 scan->csa = frm; 545 break; 546 case IEEE80211_ELEMID_QUIET: 547 scan->quiet = frm; 548 break; 549 case IEEE80211_ELEMID_FHPARMS: 550 if (ic->ic_phytype == IEEE80211_T_FH) { 551 scan->fhdwell = le16dec(&frm[2]); 552 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 553 scan->fhindex = frm[6]; 554 } 555 break; 556 case IEEE80211_ELEMID_DSPARMS: 557 /* 558 * XXX hack this since depending on phytype 559 * is problematic for multi-mode devices. 560 */ 561 if (ic->ic_phytype != IEEE80211_T_FH) 562 scan->chan = frm[2]; 563 break; 564 case IEEE80211_ELEMID_TIM: 565 /* XXX ATIM? */ 566 scan->tim = frm; 567 scan->timoff = frm - mtod(m, uint8_t *); 568 break; 569 case IEEE80211_ELEMID_IBSSPARMS: 570 case IEEE80211_ELEMID_CFPARMS: 571 case IEEE80211_ELEMID_PWRCNSTR: 572 case IEEE80211_ELEMID_BSSLOAD: 573 case IEEE80211_ELEMID_APCHANREP: 574 /* NB: avoid debugging complaints */ 575 break; 576 case IEEE80211_ELEMID_XRATES: 577 scan->xrates = frm; 578 break; 579 case IEEE80211_ELEMID_ERP: 580 if (frm[1] != 1) { 581 IEEE80211_DISCARD_IE(vap, 582 IEEE80211_MSG_ELEMID, wh, "ERP", 583 "bad len %u", frm[1]); 584 vap->iv_stats.is_rx_elem_toobig++; 585 break; 586 } 587 scan->erp = frm[2] | 0x100; 588 break; 589 case IEEE80211_ELEMID_HTCAP: 590 scan->htcap = frm; 591 break; 592 case IEEE80211_ELEMID_VHT_CAP: 593 scan->vhtcap = frm; 594 break; 595 case IEEE80211_ELEMID_VHT_OPMODE: 596 scan->vhtopmode = frm; 597 break; 598 case IEEE80211_ELEMID_RSN: 599 scan->rsn = frm; 600 break; 601 case IEEE80211_ELEMID_HTINFO: 602 scan->htinfo = frm; 603 break; 604 #ifdef IEEE80211_SUPPORT_MESH 605 case IEEE80211_ELEMID_MESHID: 606 scan->meshid = frm; 607 break; 608 case IEEE80211_ELEMID_MESHCONF: 609 scan->meshconf = frm; 610 break; 611 #endif 612 /* Extended capabilities; nothing handles it for now */ 613 case IEEE80211_ELEMID_EXTCAP: 614 break; 615 case IEEE80211_ELEMID_VENDOR: 616 if (iswpaoui(frm)) 617 scan->wpa = frm; 618 else if (iswmeparam(frm) || iswmeinfo(frm)) 619 scan->wme = frm; 620 #ifdef IEEE80211_SUPPORT_SUPERG 621 else if (isatherosoui(frm)) 622 scan->ath = frm; 623 #endif 624 #ifdef IEEE80211_SUPPORT_TDMA 625 else if (istdmaoui(frm)) 626 scan->tdma = frm; 627 #endif 628 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 629 /* 630 * Accept pre-draft HT ie's if the 631 * standard ones have not been seen. 632 */ 633 if (ishtcapoui(frm)) { 634 if (scan->htcap == NULL) 635 scan->htcap = frm; 636 } else if (ishtinfooui(frm)) { 637 if (scan->htinfo == NULL) 638 scan->htcap = frm; 639 } 640 } 641 break; 642 default: 643 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 644 wh, "unhandled", 645 "id %u, len %u", *frm, frm[1]); 646 vap->iv_stats.is_rx_elem_unknown++; 647 break; 648 } 649 frm += frm[1] + 2; 650 } 651 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 652 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 653 if (scan->rates != NULL && scan->xrates != NULL) { 654 /* 655 * NB: don't process XRATES if RATES is missing. This 656 * avoids a potential null ptr deref and should be ok 657 * as the return code will already note RATES is missing 658 * (so callers shouldn't otherwise process the frame). 659 */ 660 IEEE80211_VERIFY_ELEMENT(scan->xrates, 661 IEEE80211_RATE_MAXSIZE - scan->rates[1], 662 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 663 } 664 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 665 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 666 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 667 /* 668 * Frame was received on a channel different from the 669 * one indicated in the DS params element id; 670 * silently discard it. 671 * 672 * NB: this can happen due to signal leakage. 673 * But we should take it for FH phy because 674 * the rssi value should be correct even for 675 * different hop pattern in FH. 676 */ 677 IEEE80211_DISCARD(vap, 678 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 679 wh, NULL, "for off-channel %u (bchan=%u)", 680 scan->chan, scan->bchan); 681 vap->iv_stats.is_rx_chanmismatch++; 682 scan->status |= IEEE80211_BPARSE_OFFCHAN; 683 } 684 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 685 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 686 IEEE80211_DISCARD(vap, 687 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 688 wh, NULL, "bogus beacon interval (%d TU)", 689 (int) scan->bintval); 690 vap->iv_stats.is_rx_badbintval++; 691 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 692 } 693 if (scan->country != NULL) { 694 /* 695 * Validate we have at least enough data to extract 696 * the country code. Not sure if we should return an 697 * error instead of discarding the IE; consider this 698 * being lenient as we don't depend on the data for 699 * correct operation. 700 */ 701 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 702 scan->country = NULL); 703 } 704 if (scan->csa != NULL) { 705 /* 706 * Validate Channel Switch Announcement; this must 707 * be the correct length or we toss the frame. 708 */ 709 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 710 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 711 } 712 /* 713 * Process HT ie's. This is complicated by our 714 * accepting both the standard ie's and the pre-draft 715 * vendor OUI ie's that some vendors still use/require. 716 */ 717 if (scan->htcap != NULL) { 718 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 719 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 720 4 + sizeof(struct ieee80211_ie_htcap)-2 : 721 sizeof(struct ieee80211_ie_htcap)-2, 722 scan->htcap = NULL); 723 } 724 if (scan->htinfo != NULL) { 725 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 726 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 727 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 728 sizeof(struct ieee80211_ie_htinfo)-2, 729 scan->htinfo = NULL); 730 } 731 732 /* Process VHT IEs */ 733 if (scan->vhtcap != NULL) { 734 IEEE80211_VERIFY_LENGTH(scan->vhtcap[1], 735 sizeof(struct ieee80211_ie_vhtcap) - 2, 736 scan->vhtcap = NULL); 737 } 738 if (scan->vhtopmode != NULL) { 739 IEEE80211_VERIFY_LENGTH(scan->vhtopmode[1], 740 sizeof(struct ieee80211_ie_vht_operation) - 2, 741 scan->vhtopmode = NULL); 742 } 743 744 return scan->status; 745 } 746 747 /* 748 * Parse an Action frame. Return 0 on success, non-zero on failure. 749 */ 750 int 751 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 752 { 753 struct ieee80211vap *vap = ni->ni_vap; 754 const struct ieee80211_action *ia; 755 struct ieee80211_frame *wh; 756 uint8_t *frm, *efrm; 757 758 /* 759 * action frame format: 760 * [1] category 761 * [1] action 762 * [tlv] parameters 763 */ 764 wh = mtod(m, struct ieee80211_frame *); 765 frm = (u_int8_t *)&wh[1]; 766 efrm = mtod(m, u_int8_t *) + m->m_len; 767 IEEE80211_VERIFY_LENGTH(efrm - frm, 768 sizeof(struct ieee80211_action), return EINVAL); 769 ia = (const struct ieee80211_action *) frm; 770 771 vap->iv_stats.is_rx_action++; 772 IEEE80211_NODE_STAT(ni, rx_action); 773 774 /* verify frame payloads but defer processing */ 775 switch (ia->ia_category) { 776 case IEEE80211_ACTION_CAT_BA: 777 switch (ia->ia_action) { 778 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 779 IEEE80211_VERIFY_LENGTH(efrm - frm, 780 sizeof(struct ieee80211_action_ba_addbarequest), 781 return EINVAL); 782 break; 783 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 784 IEEE80211_VERIFY_LENGTH(efrm - frm, 785 sizeof(struct ieee80211_action_ba_addbaresponse), 786 return EINVAL); 787 break; 788 case IEEE80211_ACTION_BA_DELBA: 789 IEEE80211_VERIFY_LENGTH(efrm - frm, 790 sizeof(struct ieee80211_action_ba_delba), 791 return EINVAL); 792 break; 793 } 794 break; 795 case IEEE80211_ACTION_CAT_HT: 796 switch (ia->ia_action) { 797 case IEEE80211_ACTION_HT_TXCHWIDTH: 798 IEEE80211_VERIFY_LENGTH(efrm - frm, 799 sizeof(struct ieee80211_action_ht_txchwidth), 800 return EINVAL); 801 break; 802 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 803 IEEE80211_VERIFY_LENGTH(efrm - frm, 804 sizeof(struct ieee80211_action_ht_mimopowersave), 805 return EINVAL); 806 break; 807 } 808 break; 809 #ifdef IEEE80211_SUPPORT_MESH 810 case IEEE80211_ACTION_CAT_MESH: 811 switch (ia->ia_action) { 812 case IEEE80211_ACTION_MESH_LMETRIC: 813 /* 814 * XXX: verification is true only if we are using 815 * Airtime link metric (default) 816 */ 817 IEEE80211_VERIFY_LENGTH(efrm - frm, 818 sizeof(struct ieee80211_meshlmetric_ie), 819 return EINVAL); 820 break; 821 case IEEE80211_ACTION_MESH_HWMP: 822 /* verify something */ 823 break; 824 case IEEE80211_ACTION_MESH_GANN: 825 IEEE80211_VERIFY_LENGTH(efrm - frm, 826 sizeof(struct ieee80211_meshgann_ie), 827 return EINVAL); 828 break; 829 case IEEE80211_ACTION_MESH_CC: 830 case IEEE80211_ACTION_MESH_MCCA_SREQ: 831 case IEEE80211_ACTION_MESH_MCCA_SREP: 832 case IEEE80211_ACTION_MESH_MCCA_AREQ: 833 case IEEE80211_ACTION_MESH_MCCA_ADVER: 834 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 835 case IEEE80211_ACTION_MESH_TBTT_REQ: 836 case IEEE80211_ACTION_MESH_TBTT_RES: 837 /* reject these early on, not implemented */ 838 IEEE80211_DISCARD(vap, 839 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 840 wh, NULL, "not implemented yet, act=0x%02X", 841 ia->ia_action); 842 return EINVAL; 843 } 844 break; 845 case IEEE80211_ACTION_CAT_SELF_PROT: 846 /* If TA or RA group address discard silently */ 847 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 848 IEEE80211_IS_MULTICAST(wh->i_addr2)) 849 return EINVAL; 850 /* 851 * XXX: Should we verify complete length now or it is 852 * to varying in sizes? 853 */ 854 switch (ia->ia_action) { 855 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 856 case IEEE80211_ACTION_MESHPEERING_CLOSE: 857 /* is not a peering candidate (yet) */ 858 if (ni == vap->iv_bss) 859 return EINVAL; 860 break; 861 } 862 break; 863 #endif 864 case IEEE80211_ACTION_CAT_VHT: 865 printf("%s: TODO: VHT handling!\n", __func__); 866 break; 867 } 868 return 0; 869 } 870 871 #ifdef IEEE80211_DEBUG 872 /* 873 * Debugging support. 874 */ 875 void 876 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 877 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 878 { 879 printf("[%s] discard %s frame, ssid mismatch: ", 880 ether_sprintf(mac), tag); 881 ieee80211_print_essid(ssid + 2, ssid[1]); 882 printf("\n"); 883 } 884 885 /* 886 * Return the bssid of a frame. 887 */ 888 static const uint8_t * 889 ieee80211_getbssid(const struct ieee80211vap *vap, 890 const struct ieee80211_frame *wh) 891 { 892 if (vap->iv_opmode == IEEE80211_M_STA) 893 return wh->i_addr2; 894 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 895 return wh->i_addr1; 896 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 897 return wh->i_addr1; 898 return wh->i_addr3; 899 } 900 901 #include <machine/stdarg.h> 902 903 void 904 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 905 { 906 char buf[128]; /* XXX */ 907 va_list ap; 908 909 va_start(ap, fmt); 910 vsnprintf(buf, sizeof(buf), fmt, ap); 911 va_end(ap); 912 913 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 914 } 915 916 void 917 ieee80211_note_frame(const struct ieee80211vap *vap, 918 const struct ieee80211_frame *wh, 919 const char *fmt, ...) 920 { 921 char buf[128]; /* XXX */ 922 va_list ap; 923 924 va_start(ap, fmt); 925 vsnprintf(buf, sizeof(buf), fmt, ap); 926 va_end(ap); 927 if_printf(vap->iv_ifp, "[%s] %s\n", 928 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 929 } 930 931 void 932 ieee80211_note_mac(const struct ieee80211vap *vap, 933 const uint8_t mac[IEEE80211_ADDR_LEN], 934 const char *fmt, ...) 935 { 936 char buf[128]; /* XXX */ 937 va_list ap; 938 939 va_start(ap, fmt); 940 vsnprintf(buf, sizeof(buf), fmt, ap); 941 va_end(ap); 942 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 943 } 944 945 void 946 ieee80211_discard_frame(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 printf("%s frame, ", type != NULL ? type : 955 ieee80211_mgt_subtype_name(wh->i_fc[0])); 956 va_start(ap, fmt); 957 vprintf(fmt, ap); 958 va_end(ap); 959 printf("\n"); 960 } 961 962 void 963 ieee80211_discard_ie(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 if (type != NULL) 972 printf("%s information element, ", type); 973 else 974 printf("information element, "); 975 va_start(ap, fmt); 976 vprintf(fmt, ap); 977 va_end(ap); 978 printf("\n"); 979 } 980 981 void 982 ieee80211_discard_mac(const struct ieee80211vap *vap, 983 const uint8_t mac[IEEE80211_ADDR_LEN], 984 const char *type, const char *fmt, ...) 985 { 986 va_list ap; 987 988 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 989 if (type != NULL) 990 printf("%s frame, ", type); 991 else 992 printf("frame, "); 993 va_start(ap, fmt); 994 vprintf(fmt, ap); 995 va_end(ap); 996 printf("\n"); 997 } 998 #endif /* IEEE80211_DEBUG */ 999