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 /* 234 * Unrelated fragment or no space for it, 235 * clear current fragments. 236 */ 237 m_freem(mfrag); 238 mfrag = NULL; 239 } 240 } 241 242 if (mfrag == NULL) { 243 if (fragno != 0) { /* !first fragment, discard */ 244 vap->iv_stats.is_rx_defrag++; 245 IEEE80211_NODE_STAT(ni, rx_defrag); 246 m_freem(m); 247 return NULL; 248 } 249 mfrag = m; 250 } else { /* concatenate */ 251 m_adj(m, hdrspace); /* strip header */ 252 m_cat(mfrag, m); 253 /* NB: m_cat doesn't update the packet header */ 254 mfrag->m_pkthdr.len += m->m_pkthdr.len; 255 /* track last seqnum and fragno */ 256 lwh = mtod(mfrag, struct ieee80211_frame *); 257 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 258 } 259 if (more_frag) { /* more to come, save */ 260 ni->ni_rxfragstamp = ticks; 261 ni->ni_rxfrag[0] = mfrag; 262 mfrag = NULL; 263 } 264 return mfrag; 265 } 266 267 void 268 ieee80211_deliver_data(struct ieee80211vap *vap, 269 struct ieee80211_node *ni, struct mbuf *m) 270 { 271 struct ether_header *eh = mtod(m, struct ether_header *); 272 struct ifnet *ifp = vap->iv_ifp; 273 274 /* clear driver/net80211 flags before passing up */ 275 m->m_flags &= ~(M_MCAST | M_BCAST); 276 m_clrprotoflags(m); 277 278 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 279 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 280 /* 281 * Do accounting. 282 */ 283 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 284 IEEE80211_NODE_STAT(ni, rx_data); 285 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 286 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 287 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 288 IEEE80211_NODE_STAT(ni, rx_mcast); 289 } else 290 IEEE80211_NODE_STAT(ni, rx_ucast); 291 m->m_pkthdr.rcvif = ifp; 292 293 if (ni->ni_vlan != 0) { 294 /* attach vlan tag */ 295 m->m_pkthdr.ether_vtag = ni->ni_vlan; 296 m->m_flags |= M_VLANTAG; 297 } 298 ifp->if_input(ifp, m); 299 } 300 301 struct mbuf * 302 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 303 { 304 struct ieee80211_qosframe_addr4 wh; 305 struct ether_header *eh; 306 struct llc *llc; 307 308 KASSERT(hdrlen <= sizeof(wh), 309 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 310 311 if (m->m_len < hdrlen + sizeof(*llc) && 312 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 313 vap->iv_stats.is_rx_tooshort++; 314 /* XXX msg */ 315 return NULL; 316 } 317 memcpy(&wh, mtod(m, caddr_t), hdrlen); 318 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 319 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 320 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 321 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 322 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 323 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 324 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 325 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 326 llc = NULL; 327 } else { 328 m_adj(m, hdrlen - sizeof(*eh)); 329 } 330 eh = mtod(m, struct ether_header *); 331 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 332 case IEEE80211_FC1_DIR_NODS: 333 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 334 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 335 break; 336 case IEEE80211_FC1_DIR_TODS: 337 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 338 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 339 break; 340 case IEEE80211_FC1_DIR_FROMDS: 341 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 342 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 343 break; 344 case IEEE80211_FC1_DIR_DSTODS: 345 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 346 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 347 break; 348 } 349 #ifndef __NO_STRICT_ALIGNMENT 350 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 351 m = ieee80211_realign(vap, m, sizeof(*eh)); 352 if (m == NULL) 353 return NULL; 354 } 355 #endif /* !__NO_STRICT_ALIGNMENT */ 356 if (llc != NULL) { 357 eh = mtod(m, struct ether_header *); 358 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 359 } 360 return m; 361 } 362 363 /* 364 * Decap a frame encapsulated in a fast-frame/A-MSDU. 365 */ 366 struct mbuf * 367 ieee80211_decap1(struct mbuf *m, int *framelen) 368 { 369 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 370 struct ether_header *eh; 371 struct llc *llc; 372 373 /* 374 * The frame has an 802.3 header followed by an 802.2 375 * LLC header. The encapsulated frame length is in the 376 * first header type field; save that and overwrite it 377 * with the true type field found in the second. Then 378 * copy the 802.3 header up to where it belongs and 379 * adjust the mbuf contents to remove the void. 380 */ 381 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 382 return NULL; 383 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 384 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 385 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 386 + sizeof(struct ether_header) - sizeof(struct llc); 387 eh->ether_type = llc->llc_un.type_snap.ether_type; 388 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 389 sizeof(struct ether_header)); 390 m_adj(m, sizeof(struct llc)); 391 return m; 392 #undef FF_LLC_SIZE 393 } 394 395 /* 396 * Install received rate set information in the node's state block. 397 */ 398 int 399 ieee80211_setup_rates(struct ieee80211_node *ni, 400 const uint8_t *rates, const uint8_t *xrates, int flags) 401 { 402 struct ieee80211vap *vap = ni->ni_vap; 403 struct ieee80211_rateset *rs = &ni->ni_rates; 404 405 memset(rs, 0, sizeof(*rs)); 406 rs->rs_nrates = rates[1]; 407 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 408 if (xrates != NULL) { 409 uint8_t nxrates; 410 /* 411 * Tack on 11g extended supported rate element. 412 */ 413 nxrates = xrates[1]; 414 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 415 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 416 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 417 "extended rate set too large; only using " 418 "%u of %u rates", nxrates, xrates[1]); 419 vap->iv_stats.is_rx_rstoobig++; 420 } 421 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 422 rs->rs_nrates += nxrates; 423 } 424 return ieee80211_fix_rate(ni, rs, flags); 425 } 426 427 /* 428 * Send a management frame error response to the specified 429 * station. If ni is associated with the station then use 430 * it; otherwise allocate a temporary node suitable for 431 * transmitting the frame and then free the reference so 432 * it will go away as soon as the frame has been transmitted. 433 */ 434 void 435 ieee80211_send_error(struct ieee80211_node *ni, 436 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 437 { 438 struct ieee80211vap *vap = ni->ni_vap; 439 int istmp; 440 441 if (ni == vap->iv_bss) { 442 if (vap->iv_state != IEEE80211_S_RUN) { 443 /* 444 * XXX hack until we get rid of this routine. 445 * We can be called prior to the vap reaching 446 * run state under certain conditions in which 447 * case iv_bss->ni_chan will not be setup. 448 * Check for this explicitly and and just ignore 449 * the request. 450 */ 451 return; 452 } 453 ni = ieee80211_tmp_node(vap, mac); 454 if (ni == NULL) { 455 /* XXX msg */ 456 return; 457 } 458 istmp = 1; 459 } else 460 istmp = 0; 461 IEEE80211_SEND_MGMT(ni, subtype, arg); 462 if (istmp) 463 ieee80211_free_node(ni); 464 } 465 466 int 467 ieee80211_alloc_challenge(struct ieee80211_node *ni) 468 { 469 if (ni->ni_challenge == NULL) 470 ni->ni_challenge = (uint32_t *) 471 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN, 472 M_80211_NODE, IEEE80211_M_NOWAIT); 473 if (ni->ni_challenge == NULL) { 474 IEEE80211_NOTE(ni->ni_vap, 475 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 476 "%s", "shared key challenge alloc failed"); 477 /* XXX statistic */ 478 } 479 return (ni->ni_challenge != NULL); 480 } 481 482 /* 483 * Parse a Beacon or ProbeResponse frame and return the 484 * useful information in an ieee80211_scanparams structure. 485 * Status is set to 0 if no problems were found; otherwise 486 * a bitmask of IEEE80211_BPARSE_* items is returned that 487 * describes the problems detected. 488 */ 489 int 490 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 491 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan) 492 { 493 struct ieee80211vap *vap = ni->ni_vap; 494 struct ieee80211com *ic = ni->ni_ic; 495 struct ieee80211_frame *wh; 496 uint8_t *frm, *efrm; 497 498 wh = mtod(m, struct ieee80211_frame *); 499 frm = (uint8_t *)&wh[1]; 500 efrm = mtod(m, uint8_t *) + m->m_len; 501 scan->status = 0; 502 /* 503 * beacon/probe response frame format 504 * [8] time stamp 505 * [2] beacon interval 506 * [2] capability information 507 * [tlv] ssid 508 * [tlv] supported rates 509 * [tlv] country information 510 * [tlv] channel switch announcement (CSA) 511 * [tlv] parameter set (FH/DS) 512 * [tlv] erp information 513 * [tlv] extended supported rates 514 * [tlv] WME 515 * [tlv] WPA or RSN 516 * [tlv] HT capabilities 517 * [tlv] HT information 518 * [tlv] Atheros capabilities 519 * [tlv] Mesh ID 520 * [tlv] Mesh Configuration 521 */ 522 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 523 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 524 memset(scan, 0, sizeof(*scan)); 525 scan->tstamp = frm; frm += 8; 526 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 527 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 528 scan->bchan = ieee80211_chan2ieee(ic, rxchan); 529 scan->chan = scan->bchan; 530 scan->ies = frm; 531 scan->ies_len = efrm - frm; 532 533 while (efrm - frm > 1) { 534 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 535 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 536 switch (*frm) { 537 case IEEE80211_ELEMID_SSID: 538 scan->ssid = frm; 539 break; 540 case IEEE80211_ELEMID_RATES: 541 scan->rates = frm; 542 break; 543 case IEEE80211_ELEMID_COUNTRY: 544 scan->country = frm; 545 break; 546 case IEEE80211_ELEMID_CSA: 547 scan->csa = frm; 548 break; 549 case IEEE80211_ELEMID_QUIET: 550 scan->quiet = frm; 551 break; 552 case IEEE80211_ELEMID_FHPARMS: 553 if (ic->ic_phytype == IEEE80211_T_FH) { 554 scan->fhdwell = LE_READ_2(&frm[2]); 555 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 556 scan->fhindex = frm[6]; 557 } 558 break; 559 case IEEE80211_ELEMID_DSPARMS: 560 /* 561 * XXX hack this since depending on phytype 562 * is problematic for multi-mode devices. 563 */ 564 if (ic->ic_phytype != IEEE80211_T_FH) 565 scan->chan = frm[2]; 566 break; 567 case IEEE80211_ELEMID_TIM: 568 /* XXX ATIM? */ 569 scan->tim = frm; 570 scan->timoff = frm - mtod(m, uint8_t *); 571 break; 572 case IEEE80211_ELEMID_IBSSPARMS: 573 case IEEE80211_ELEMID_CFPARMS: 574 case IEEE80211_ELEMID_PWRCNSTR: 575 /* NB: avoid debugging complaints */ 576 break; 577 case IEEE80211_ELEMID_XRATES: 578 scan->xrates = frm; 579 break; 580 case IEEE80211_ELEMID_ERP: 581 if (frm[1] != 1) { 582 IEEE80211_DISCARD_IE(vap, 583 IEEE80211_MSG_ELEMID, wh, "ERP", 584 "bad len %u", frm[1]); 585 vap->iv_stats.is_rx_elem_toobig++; 586 break; 587 } 588 scan->erp = frm[2] | 0x100; 589 break; 590 case IEEE80211_ELEMID_HTCAP: 591 scan->htcap = frm; 592 break; 593 case IEEE80211_ELEMID_RSN: 594 scan->rsn = frm; 595 break; 596 case IEEE80211_ELEMID_HTINFO: 597 scan->htinfo = frm; 598 break; 599 #ifdef IEEE80211_SUPPORT_MESH 600 case IEEE80211_ELEMID_MESHID: 601 scan->meshid = frm; 602 break; 603 case IEEE80211_ELEMID_MESHCONF: 604 scan->meshconf = frm; 605 break; 606 #endif 607 case IEEE80211_ELEMID_VENDOR: 608 if (iswpaoui(frm)) 609 scan->wpa = frm; 610 else if (iswmeparam(frm) || iswmeinfo(frm)) 611 scan->wme = frm; 612 #ifdef IEEE80211_SUPPORT_SUPERG 613 else if (isatherosoui(frm)) 614 scan->ath = frm; 615 #endif 616 #ifdef IEEE80211_SUPPORT_TDMA 617 else if (istdmaoui(frm)) 618 scan->tdma = frm; 619 #endif 620 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 621 /* 622 * Accept pre-draft HT ie's if the 623 * standard ones have not been seen. 624 */ 625 if (ishtcapoui(frm)) { 626 if (scan->htcap == NULL) 627 scan->htcap = frm; 628 } else if (ishtinfooui(frm)) { 629 if (scan->htinfo == NULL) 630 scan->htcap = frm; 631 } 632 } 633 break; 634 default: 635 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 636 wh, "unhandled", 637 "id %u, len %u", *frm, frm[1]); 638 vap->iv_stats.is_rx_elem_unknown++; 639 break; 640 } 641 frm += frm[1] + 2; 642 } 643 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 644 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 645 if (scan->rates != NULL && scan->xrates != NULL) { 646 /* 647 * NB: don't process XRATES if RATES is missing. This 648 * avoids a potential null ptr deref and should be ok 649 * as the return code will already note RATES is missing 650 * (so callers shouldn't otherwise process the frame). 651 */ 652 IEEE80211_VERIFY_ELEMENT(scan->xrates, 653 IEEE80211_RATE_MAXSIZE - scan->rates[1], 654 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 655 } 656 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 657 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 658 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 659 /* 660 * Frame was received on a channel different from the 661 * one indicated in the DS params element id; 662 * silently discard it. 663 * 664 * NB: this can happen due to signal leakage. 665 * But we should take it for FH phy because 666 * the rssi value should be correct even for 667 * different hop pattern in FH. 668 */ 669 IEEE80211_DISCARD(vap, 670 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 671 wh, NULL, "for off-channel %u (bchan=%u)", 672 scan->chan, scan->bchan); 673 vap->iv_stats.is_rx_chanmismatch++; 674 scan->status |= IEEE80211_BPARSE_OFFCHAN; 675 } 676 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 677 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 678 IEEE80211_DISCARD(vap, 679 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 680 wh, NULL, "bogus beacon interval (%d TU)", 681 (int) scan->bintval); 682 vap->iv_stats.is_rx_badbintval++; 683 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 684 } 685 if (scan->country != NULL) { 686 /* 687 * Validate we have at least enough data to extract 688 * the country code. Not sure if we should return an 689 * error instead of discarding the IE; consider this 690 * being lenient as we don't depend on the data for 691 * correct operation. 692 */ 693 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 694 scan->country = NULL); 695 } 696 if (scan->csa != NULL) { 697 /* 698 * Validate Channel Switch Announcement; this must 699 * be the correct length or we toss the frame. 700 */ 701 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 702 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 703 } 704 /* 705 * Process HT ie's. This is complicated by our 706 * accepting both the standard ie's and the pre-draft 707 * vendor OUI ie's that some vendors still use/require. 708 */ 709 if (scan->htcap != NULL) { 710 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 711 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 712 4 + sizeof(struct ieee80211_ie_htcap)-2 : 713 sizeof(struct ieee80211_ie_htcap)-2, 714 scan->htcap = NULL); 715 } 716 if (scan->htinfo != NULL) { 717 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 718 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 719 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 720 sizeof(struct ieee80211_ie_htinfo)-2, 721 scan->htinfo = NULL); 722 } 723 return scan->status; 724 } 725 726 /* 727 * Parse an Action frame. Return 0 on success, non-zero on failure. 728 */ 729 int 730 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 731 { 732 struct ieee80211vap *vap = ni->ni_vap; 733 const struct ieee80211_action *ia; 734 struct ieee80211_frame *wh; 735 uint8_t *frm, *efrm; 736 737 /* 738 * action frame format: 739 * [1] category 740 * [1] action 741 * [tlv] parameters 742 */ 743 wh = mtod(m, struct ieee80211_frame *); 744 frm = (u_int8_t *)&wh[1]; 745 efrm = mtod(m, u_int8_t *) + m->m_len; 746 IEEE80211_VERIFY_LENGTH(efrm - frm, 747 sizeof(struct ieee80211_action), return EINVAL); 748 ia = (const struct ieee80211_action *) frm; 749 750 vap->iv_stats.is_rx_action++; 751 IEEE80211_NODE_STAT(ni, rx_action); 752 753 /* verify frame payloads but defer processing */ 754 switch (ia->ia_category) { 755 case IEEE80211_ACTION_CAT_BA: 756 switch (ia->ia_action) { 757 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 758 IEEE80211_VERIFY_LENGTH(efrm - frm, 759 sizeof(struct ieee80211_action_ba_addbarequest), 760 return EINVAL); 761 break; 762 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 763 IEEE80211_VERIFY_LENGTH(efrm - frm, 764 sizeof(struct ieee80211_action_ba_addbaresponse), 765 return EINVAL); 766 break; 767 case IEEE80211_ACTION_BA_DELBA: 768 IEEE80211_VERIFY_LENGTH(efrm - frm, 769 sizeof(struct ieee80211_action_ba_delba), 770 return EINVAL); 771 break; 772 } 773 break; 774 case IEEE80211_ACTION_CAT_HT: 775 switch (ia->ia_action) { 776 case IEEE80211_ACTION_HT_TXCHWIDTH: 777 IEEE80211_VERIFY_LENGTH(efrm - frm, 778 sizeof(struct ieee80211_action_ht_txchwidth), 779 return EINVAL); 780 break; 781 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 782 IEEE80211_VERIFY_LENGTH(efrm - frm, 783 sizeof(struct ieee80211_action_ht_mimopowersave), 784 return EINVAL); 785 break; 786 } 787 break; 788 #ifdef IEEE80211_SUPPORT_MESH 789 case IEEE80211_ACTION_CAT_MESH: 790 switch (ia->ia_action) { 791 case IEEE80211_ACTION_MESH_LMETRIC: 792 /* 793 * XXX: verification is true only if we are using 794 * Airtime link metric (default) 795 */ 796 IEEE80211_VERIFY_LENGTH(efrm - frm, 797 sizeof(struct ieee80211_meshlmetric_ie), 798 return EINVAL); 799 break; 800 case IEEE80211_ACTION_MESH_HWMP: 801 /* verify something */ 802 break; 803 case IEEE80211_ACTION_MESH_GANN: 804 IEEE80211_VERIFY_LENGTH(efrm - frm, 805 sizeof(struct ieee80211_meshgann_ie), 806 return EINVAL); 807 break; 808 case IEEE80211_ACTION_MESH_CC: 809 case IEEE80211_ACTION_MESH_MCCA_SREQ: 810 case IEEE80211_ACTION_MESH_MCCA_SREP: 811 case IEEE80211_ACTION_MESH_MCCA_AREQ: 812 case IEEE80211_ACTION_MESH_MCCA_ADVER: 813 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 814 case IEEE80211_ACTION_MESH_TBTT_REQ: 815 case IEEE80211_ACTION_MESH_TBTT_RES: 816 /* reject these early on, not implemented */ 817 IEEE80211_DISCARD(vap, 818 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 819 wh, NULL, "not implemented yet, act=0x%02X", 820 ia->ia_action); 821 return EINVAL; 822 } 823 break; 824 case IEEE80211_ACTION_CAT_SELF_PROT: 825 /* If TA or RA group address discard silently */ 826 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 827 IEEE80211_IS_MULTICAST(wh->i_addr2)) 828 return EINVAL; 829 /* 830 * XXX: Should we verify complete length now or it is 831 * to varying in sizes? 832 */ 833 switch (ia->ia_action) { 834 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 835 case IEEE80211_ACTION_MESHPEERING_CLOSE: 836 /* is not a peering candidate (yet) */ 837 if (ni == vap->iv_bss) 838 return EINVAL; 839 break; 840 } 841 break; 842 #endif 843 } 844 return 0; 845 } 846 847 #ifdef IEEE80211_DEBUG 848 /* 849 * Debugging support. 850 */ 851 void 852 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 853 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 854 { 855 printf("[%s] discard %s frame, ssid mismatch: ", 856 ether_sprintf(mac), tag); 857 ieee80211_print_essid(ssid + 2, ssid[1]); 858 printf("\n"); 859 } 860 861 /* 862 * Return the bssid of a frame. 863 */ 864 static const uint8_t * 865 ieee80211_getbssid(const struct ieee80211vap *vap, 866 const struct ieee80211_frame *wh) 867 { 868 if (vap->iv_opmode == IEEE80211_M_STA) 869 return wh->i_addr2; 870 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 871 return wh->i_addr1; 872 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 873 return wh->i_addr1; 874 return wh->i_addr3; 875 } 876 877 #include <machine/stdarg.h> 878 879 void 880 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 881 { 882 char buf[128]; /* XXX */ 883 va_list ap; 884 885 va_start(ap, fmt); 886 vsnprintf(buf, sizeof(buf), fmt, ap); 887 va_end(ap); 888 889 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 890 } 891 892 void 893 ieee80211_note_frame(const struct ieee80211vap *vap, 894 const struct ieee80211_frame *wh, 895 const char *fmt, ...) 896 { 897 char buf[128]; /* XXX */ 898 va_list ap; 899 900 va_start(ap, fmt); 901 vsnprintf(buf, sizeof(buf), fmt, ap); 902 va_end(ap); 903 if_printf(vap->iv_ifp, "[%s] %s\n", 904 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 905 } 906 907 void 908 ieee80211_note_mac(const struct ieee80211vap *vap, 909 const uint8_t mac[IEEE80211_ADDR_LEN], 910 const char *fmt, ...) 911 { 912 char buf[128]; /* XXX */ 913 va_list ap; 914 915 va_start(ap, fmt); 916 vsnprintf(buf, sizeof(buf), fmt, ap); 917 va_end(ap); 918 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 919 } 920 921 void 922 ieee80211_discard_frame(const struct ieee80211vap *vap, 923 const struct ieee80211_frame *wh, 924 const char *type, const char *fmt, ...) 925 { 926 va_list ap; 927 928 if_printf(vap->iv_ifp, "[%s] discard ", 929 ether_sprintf(ieee80211_getbssid(vap, wh))); 930 if (type == NULL) { 931 printf("%s frame, ", ieee80211_mgt_subtype_name[ 932 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 933 IEEE80211_FC0_SUBTYPE_SHIFT]); 934 } else 935 printf("%s frame, ", type); 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 */ 979