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_catpkt(mfrag, m); 253 /* track last seqnum and fragno */ 254 lwh = mtod(mfrag, struct ieee80211_frame *); 255 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 256 } 257 if (more_frag) { /* more to come, save */ 258 ni->ni_rxfragstamp = ticks; 259 ni->ni_rxfrag[0] = mfrag; 260 mfrag = NULL; 261 } 262 return mfrag; 263 } 264 265 void 266 ieee80211_deliver_data(struct ieee80211vap *vap, 267 struct ieee80211_node *ni, struct mbuf *m) 268 { 269 struct ether_header *eh = mtod(m, struct ether_header *); 270 struct ifnet *ifp = vap->iv_ifp; 271 272 /* clear driver/net80211 flags before passing up */ 273 m->m_flags &= ~(M_MCAST | M_BCAST); 274 m_clrprotoflags(m); 275 276 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 277 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 278 /* 279 * Do accounting. 280 */ 281 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 282 IEEE80211_NODE_STAT(ni, rx_data); 283 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 284 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 285 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 286 IEEE80211_NODE_STAT(ni, rx_mcast); 287 } else 288 IEEE80211_NODE_STAT(ni, rx_ucast); 289 m->m_pkthdr.rcvif = ifp; 290 291 if (ni->ni_vlan != 0) { 292 /* attach vlan tag */ 293 m->m_pkthdr.ether_vtag = ni->ni_vlan; 294 m->m_flags |= M_VLANTAG; 295 } 296 ifp->if_input(ifp, m); 297 } 298 299 struct mbuf * 300 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 301 { 302 struct ieee80211_qosframe_addr4 wh; 303 struct ether_header *eh; 304 struct llc *llc; 305 306 KASSERT(hdrlen <= sizeof(wh), 307 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 308 309 if (m->m_len < hdrlen + sizeof(*llc) && 310 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 311 vap->iv_stats.is_rx_tooshort++; 312 /* XXX msg */ 313 return NULL; 314 } 315 memcpy(&wh, mtod(m, caddr_t), hdrlen); 316 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 317 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 318 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 319 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 320 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 321 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 322 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 323 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 324 llc = NULL; 325 } else { 326 m_adj(m, hdrlen - sizeof(*eh)); 327 } 328 eh = mtod(m, struct ether_header *); 329 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 330 case IEEE80211_FC1_DIR_NODS: 331 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 332 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 333 break; 334 case IEEE80211_FC1_DIR_TODS: 335 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 336 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 337 break; 338 case IEEE80211_FC1_DIR_FROMDS: 339 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 340 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 341 break; 342 case IEEE80211_FC1_DIR_DSTODS: 343 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 344 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 345 break; 346 } 347 #ifndef __NO_STRICT_ALIGNMENT 348 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 349 m = ieee80211_realign(vap, m, sizeof(*eh)); 350 if (m == NULL) 351 return NULL; 352 } 353 #endif /* !__NO_STRICT_ALIGNMENT */ 354 if (llc != NULL) { 355 eh = mtod(m, struct ether_header *); 356 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 357 } 358 return m; 359 } 360 361 /* 362 * Decap a frame encapsulated in a fast-frame/A-MSDU. 363 */ 364 struct mbuf * 365 ieee80211_decap1(struct mbuf *m, int *framelen) 366 { 367 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 368 struct ether_header *eh; 369 struct llc *llc; 370 371 /* 372 * The frame has an 802.3 header followed by an 802.2 373 * LLC header. The encapsulated frame length is in the 374 * first header type field; save that and overwrite it 375 * with the true type field found in the second. Then 376 * copy the 802.3 header up to where it belongs and 377 * adjust the mbuf contents to remove the void. 378 */ 379 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 380 return NULL; 381 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 382 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 383 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 384 + sizeof(struct ether_header) - sizeof(struct llc); 385 eh->ether_type = llc->llc_un.type_snap.ether_type; 386 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 387 sizeof(struct ether_header)); 388 m_adj(m, sizeof(struct llc)); 389 return m; 390 #undef FF_LLC_SIZE 391 } 392 393 /* 394 * Install received rate set information in the node's state block. 395 */ 396 int 397 ieee80211_setup_rates(struct ieee80211_node *ni, 398 const uint8_t *rates, const uint8_t *xrates, int flags) 399 { 400 struct ieee80211vap *vap = ni->ni_vap; 401 struct ieee80211_rateset *rs = &ni->ni_rates; 402 403 memset(rs, 0, sizeof(*rs)); 404 rs->rs_nrates = rates[1]; 405 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 406 if (xrates != NULL) { 407 uint8_t nxrates; 408 /* 409 * Tack on 11g extended supported rate element. 410 */ 411 nxrates = xrates[1]; 412 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 413 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 414 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 415 "extended rate set too large; only using " 416 "%u of %u rates", nxrates, xrates[1]); 417 vap->iv_stats.is_rx_rstoobig++; 418 } 419 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 420 rs->rs_nrates += nxrates; 421 } 422 return ieee80211_fix_rate(ni, rs, flags); 423 } 424 425 /* 426 * Send a management frame error response to the specified 427 * station. If ni is associated with the station then use 428 * it; otherwise allocate a temporary node suitable for 429 * transmitting the frame and then free the reference so 430 * it will go away as soon as the frame has been transmitted. 431 */ 432 void 433 ieee80211_send_error(struct ieee80211_node *ni, 434 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 435 { 436 struct ieee80211vap *vap = ni->ni_vap; 437 int istmp; 438 439 if (ni == vap->iv_bss) { 440 if (vap->iv_state != IEEE80211_S_RUN) { 441 /* 442 * XXX hack until we get rid of this routine. 443 * We can be called prior to the vap reaching 444 * run state under certain conditions in which 445 * case iv_bss->ni_chan will not be setup. 446 * Check for this explicitly and and just ignore 447 * the request. 448 */ 449 return; 450 } 451 ni = ieee80211_tmp_node(vap, mac); 452 if (ni == NULL) { 453 /* XXX msg */ 454 return; 455 } 456 istmp = 1; 457 } else 458 istmp = 0; 459 IEEE80211_SEND_MGMT(ni, subtype, arg); 460 if (istmp) 461 ieee80211_free_node(ni); 462 } 463 464 int 465 ieee80211_alloc_challenge(struct ieee80211_node *ni) 466 { 467 if (ni->ni_challenge == NULL) 468 ni->ni_challenge = (uint32_t *) 469 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN, 470 M_80211_NODE, IEEE80211_M_NOWAIT); 471 if (ni->ni_challenge == NULL) { 472 IEEE80211_NOTE(ni->ni_vap, 473 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 474 "%s", "shared key challenge alloc failed"); 475 /* XXX statistic */ 476 } 477 return (ni->ni_challenge != NULL); 478 } 479 480 /* 481 * Parse a Beacon or ProbeResponse frame and return the 482 * useful information in an ieee80211_scanparams structure. 483 * Status is set to 0 if no problems were found; otherwise 484 * a bitmask of IEEE80211_BPARSE_* items is returned that 485 * describes the problems detected. 486 */ 487 int 488 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 489 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan) 490 { 491 struct ieee80211vap *vap = ni->ni_vap; 492 struct ieee80211com *ic = ni->ni_ic; 493 struct ieee80211_frame *wh; 494 uint8_t *frm, *efrm; 495 496 wh = mtod(m, struct ieee80211_frame *); 497 frm = (uint8_t *)&wh[1]; 498 efrm = mtod(m, uint8_t *) + m->m_len; 499 scan->status = 0; 500 /* 501 * beacon/probe response frame format 502 * [8] time stamp 503 * [2] beacon interval 504 * [2] capability information 505 * [tlv] ssid 506 * [tlv] supported rates 507 * [tlv] country information 508 * [tlv] channel switch announcement (CSA) 509 * [tlv] parameter set (FH/DS) 510 * [tlv] erp information 511 * [tlv] extended supported rates 512 * [tlv] WME 513 * [tlv] WPA or RSN 514 * [tlv] HT capabilities 515 * [tlv] HT information 516 * [tlv] Atheros capabilities 517 * [tlv] Mesh ID 518 * [tlv] Mesh Configuration 519 */ 520 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 521 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 522 memset(scan, 0, sizeof(*scan)); 523 scan->tstamp = frm; frm += 8; 524 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 525 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 526 scan->bchan = ieee80211_chan2ieee(ic, rxchan); 527 scan->chan = scan->bchan; 528 scan->ies = frm; 529 scan->ies_len = efrm - frm; 530 531 while (efrm - frm > 1) { 532 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 533 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 534 switch (*frm) { 535 case IEEE80211_ELEMID_SSID: 536 scan->ssid = frm; 537 break; 538 case IEEE80211_ELEMID_RATES: 539 scan->rates = frm; 540 break; 541 case IEEE80211_ELEMID_COUNTRY: 542 scan->country = frm; 543 break; 544 case IEEE80211_ELEMID_CSA: 545 scan->csa = frm; 546 break; 547 case IEEE80211_ELEMID_QUIET: 548 scan->quiet = frm; 549 break; 550 case IEEE80211_ELEMID_FHPARMS: 551 if (ic->ic_phytype == IEEE80211_T_FH) { 552 scan->fhdwell = LE_READ_2(&frm[2]); 553 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 554 scan->fhindex = frm[6]; 555 } 556 break; 557 case IEEE80211_ELEMID_DSPARMS: 558 /* 559 * XXX hack this since depending on phytype 560 * is problematic for multi-mode devices. 561 */ 562 if (ic->ic_phytype != IEEE80211_T_FH) 563 scan->chan = frm[2]; 564 break; 565 case IEEE80211_ELEMID_TIM: 566 /* XXX ATIM? */ 567 scan->tim = frm; 568 scan->timoff = frm - mtod(m, uint8_t *); 569 break; 570 case IEEE80211_ELEMID_IBSSPARMS: 571 case IEEE80211_ELEMID_CFPARMS: 572 case IEEE80211_ELEMID_PWRCNSTR: 573 /* NB: avoid debugging complaints */ 574 break; 575 case IEEE80211_ELEMID_XRATES: 576 scan->xrates = frm; 577 break; 578 case IEEE80211_ELEMID_ERP: 579 if (frm[1] != 1) { 580 IEEE80211_DISCARD_IE(vap, 581 IEEE80211_MSG_ELEMID, wh, "ERP", 582 "bad len %u", frm[1]); 583 vap->iv_stats.is_rx_elem_toobig++; 584 break; 585 } 586 scan->erp = frm[2] | 0x100; 587 break; 588 case IEEE80211_ELEMID_HTCAP: 589 scan->htcap = frm; 590 break; 591 case IEEE80211_ELEMID_RSN: 592 scan->rsn = frm; 593 break; 594 case IEEE80211_ELEMID_HTINFO: 595 scan->htinfo = frm; 596 break; 597 #ifdef IEEE80211_SUPPORT_MESH 598 case IEEE80211_ELEMID_MESHID: 599 scan->meshid = frm; 600 break; 601 case IEEE80211_ELEMID_MESHCONF: 602 scan->meshconf = frm; 603 break; 604 #endif 605 case IEEE80211_ELEMID_VENDOR: 606 if (iswpaoui(frm)) 607 scan->wpa = frm; 608 else if (iswmeparam(frm) || iswmeinfo(frm)) 609 scan->wme = frm; 610 #ifdef IEEE80211_SUPPORT_SUPERG 611 else if (isatherosoui(frm)) 612 scan->ath = frm; 613 #endif 614 #ifdef IEEE80211_SUPPORT_TDMA 615 else if (istdmaoui(frm)) 616 scan->tdma = frm; 617 #endif 618 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 619 /* 620 * Accept pre-draft HT ie's if the 621 * standard ones have not been seen. 622 */ 623 if (ishtcapoui(frm)) { 624 if (scan->htcap == NULL) 625 scan->htcap = frm; 626 } else if (ishtinfooui(frm)) { 627 if (scan->htinfo == NULL) 628 scan->htcap = frm; 629 } 630 } 631 break; 632 default: 633 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 634 wh, "unhandled", 635 "id %u, len %u", *frm, frm[1]); 636 vap->iv_stats.is_rx_elem_unknown++; 637 break; 638 } 639 frm += frm[1] + 2; 640 } 641 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 642 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 643 if (scan->rates != NULL && scan->xrates != NULL) { 644 /* 645 * NB: don't process XRATES if RATES is missing. This 646 * avoids a potential null ptr deref and should be ok 647 * as the return code will already note RATES is missing 648 * (so callers shouldn't otherwise process the frame). 649 */ 650 IEEE80211_VERIFY_ELEMENT(scan->xrates, 651 IEEE80211_RATE_MAXSIZE - scan->rates[1], 652 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 653 } 654 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 655 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 656 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 657 /* 658 * Frame was received on a channel different from the 659 * one indicated in the DS params element id; 660 * silently discard it. 661 * 662 * NB: this can happen due to signal leakage. 663 * But we should take it for FH phy because 664 * the rssi value should be correct even for 665 * different hop pattern in FH. 666 */ 667 IEEE80211_DISCARD(vap, 668 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 669 wh, NULL, "for off-channel %u (bchan=%u)", 670 scan->chan, scan->bchan); 671 vap->iv_stats.is_rx_chanmismatch++; 672 scan->status |= IEEE80211_BPARSE_OFFCHAN; 673 } 674 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 675 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 676 IEEE80211_DISCARD(vap, 677 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 678 wh, NULL, "bogus beacon interval (%d TU)", 679 (int) scan->bintval); 680 vap->iv_stats.is_rx_badbintval++; 681 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 682 } 683 if (scan->country != NULL) { 684 /* 685 * Validate we have at least enough data to extract 686 * the country code. Not sure if we should return an 687 * error instead of discarding the IE; consider this 688 * being lenient as we don't depend on the data for 689 * correct operation. 690 */ 691 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 692 scan->country = NULL); 693 } 694 if (scan->csa != NULL) { 695 /* 696 * Validate Channel Switch Announcement; this must 697 * be the correct length or we toss the frame. 698 */ 699 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 700 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 701 } 702 /* 703 * Process HT ie's. This is complicated by our 704 * accepting both the standard ie's and the pre-draft 705 * vendor OUI ie's that some vendors still use/require. 706 */ 707 if (scan->htcap != NULL) { 708 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 709 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 710 4 + sizeof(struct ieee80211_ie_htcap)-2 : 711 sizeof(struct ieee80211_ie_htcap)-2, 712 scan->htcap = NULL); 713 } 714 if (scan->htinfo != NULL) { 715 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 716 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 717 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 718 sizeof(struct ieee80211_ie_htinfo)-2, 719 scan->htinfo = NULL); 720 } 721 return scan->status; 722 } 723 724 /* 725 * Parse an Action frame. Return 0 on success, non-zero on failure. 726 */ 727 int 728 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 729 { 730 struct ieee80211vap *vap = ni->ni_vap; 731 const struct ieee80211_action *ia; 732 struct ieee80211_frame *wh; 733 uint8_t *frm, *efrm; 734 735 /* 736 * action frame format: 737 * [1] category 738 * [1] action 739 * [tlv] parameters 740 */ 741 wh = mtod(m, struct ieee80211_frame *); 742 frm = (u_int8_t *)&wh[1]; 743 efrm = mtod(m, u_int8_t *) + m->m_len; 744 IEEE80211_VERIFY_LENGTH(efrm - frm, 745 sizeof(struct ieee80211_action), return EINVAL); 746 ia = (const struct ieee80211_action *) frm; 747 748 vap->iv_stats.is_rx_action++; 749 IEEE80211_NODE_STAT(ni, rx_action); 750 751 /* verify frame payloads but defer processing */ 752 switch (ia->ia_category) { 753 case IEEE80211_ACTION_CAT_BA: 754 switch (ia->ia_action) { 755 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 756 IEEE80211_VERIFY_LENGTH(efrm - frm, 757 sizeof(struct ieee80211_action_ba_addbarequest), 758 return EINVAL); 759 break; 760 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 761 IEEE80211_VERIFY_LENGTH(efrm - frm, 762 sizeof(struct ieee80211_action_ba_addbaresponse), 763 return EINVAL); 764 break; 765 case IEEE80211_ACTION_BA_DELBA: 766 IEEE80211_VERIFY_LENGTH(efrm - frm, 767 sizeof(struct ieee80211_action_ba_delba), 768 return EINVAL); 769 break; 770 } 771 break; 772 case IEEE80211_ACTION_CAT_HT: 773 switch (ia->ia_action) { 774 case IEEE80211_ACTION_HT_TXCHWIDTH: 775 IEEE80211_VERIFY_LENGTH(efrm - frm, 776 sizeof(struct ieee80211_action_ht_txchwidth), 777 return EINVAL); 778 break; 779 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 780 IEEE80211_VERIFY_LENGTH(efrm - frm, 781 sizeof(struct ieee80211_action_ht_mimopowersave), 782 return EINVAL); 783 break; 784 } 785 break; 786 #ifdef IEEE80211_SUPPORT_MESH 787 case IEEE80211_ACTION_CAT_MESH: 788 switch (ia->ia_action) { 789 case IEEE80211_ACTION_MESH_LMETRIC: 790 /* 791 * XXX: verification is true only if we are using 792 * Airtime link metric (default) 793 */ 794 IEEE80211_VERIFY_LENGTH(efrm - frm, 795 sizeof(struct ieee80211_meshlmetric_ie), 796 return EINVAL); 797 break; 798 case IEEE80211_ACTION_MESH_HWMP: 799 /* verify something */ 800 break; 801 case IEEE80211_ACTION_MESH_GANN: 802 IEEE80211_VERIFY_LENGTH(efrm - frm, 803 sizeof(struct ieee80211_meshgann_ie), 804 return EINVAL); 805 break; 806 case IEEE80211_ACTION_MESH_CC: 807 case IEEE80211_ACTION_MESH_MCCA_SREQ: 808 case IEEE80211_ACTION_MESH_MCCA_SREP: 809 case IEEE80211_ACTION_MESH_MCCA_AREQ: 810 case IEEE80211_ACTION_MESH_MCCA_ADVER: 811 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 812 case IEEE80211_ACTION_MESH_TBTT_REQ: 813 case IEEE80211_ACTION_MESH_TBTT_RES: 814 /* reject these early on, not implemented */ 815 IEEE80211_DISCARD(vap, 816 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 817 wh, NULL, "not implemented yet, act=0x%02X", 818 ia->ia_action); 819 return EINVAL; 820 } 821 break; 822 case IEEE80211_ACTION_CAT_SELF_PROT: 823 /* If TA or RA group address discard silently */ 824 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 825 IEEE80211_IS_MULTICAST(wh->i_addr2)) 826 return EINVAL; 827 /* 828 * XXX: Should we verify complete length now or it is 829 * to varying in sizes? 830 */ 831 switch (ia->ia_action) { 832 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 833 case IEEE80211_ACTION_MESHPEERING_CLOSE: 834 /* is not a peering candidate (yet) */ 835 if (ni == vap->iv_bss) 836 return EINVAL; 837 break; 838 } 839 break; 840 #endif 841 } 842 return 0; 843 } 844 845 #ifdef IEEE80211_DEBUG 846 /* 847 * Debugging support. 848 */ 849 void 850 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 851 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 852 { 853 printf("[%s] discard %s frame, ssid mismatch: ", 854 ether_sprintf(mac), tag); 855 ieee80211_print_essid(ssid + 2, ssid[1]); 856 printf("\n"); 857 } 858 859 /* 860 * Return the bssid of a frame. 861 */ 862 static const uint8_t * 863 ieee80211_getbssid(const struct ieee80211vap *vap, 864 const struct ieee80211_frame *wh) 865 { 866 if (vap->iv_opmode == IEEE80211_M_STA) 867 return wh->i_addr2; 868 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 869 return wh->i_addr1; 870 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 871 return wh->i_addr1; 872 return wh->i_addr3; 873 } 874 875 #include <machine/stdarg.h> 876 877 void 878 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 879 { 880 char buf[128]; /* XXX */ 881 va_list ap; 882 883 va_start(ap, fmt); 884 vsnprintf(buf, sizeof(buf), fmt, ap); 885 va_end(ap); 886 887 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 888 } 889 890 void 891 ieee80211_note_frame(const struct ieee80211vap *vap, 892 const struct ieee80211_frame *wh, 893 const char *fmt, ...) 894 { 895 char buf[128]; /* XXX */ 896 va_list ap; 897 898 va_start(ap, fmt); 899 vsnprintf(buf, sizeof(buf), fmt, ap); 900 va_end(ap); 901 if_printf(vap->iv_ifp, "[%s] %s\n", 902 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 903 } 904 905 void 906 ieee80211_note_mac(const struct ieee80211vap *vap, 907 const uint8_t mac[IEEE80211_ADDR_LEN], 908 const char *fmt, ...) 909 { 910 char buf[128]; /* XXX */ 911 va_list ap; 912 913 va_start(ap, fmt); 914 vsnprintf(buf, sizeof(buf), fmt, ap); 915 va_end(ap); 916 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 917 } 918 919 void 920 ieee80211_discard_frame(const struct ieee80211vap *vap, 921 const struct ieee80211_frame *wh, 922 const char *type, const char *fmt, ...) 923 { 924 va_list ap; 925 926 if_printf(vap->iv_ifp, "[%s] discard ", 927 ether_sprintf(ieee80211_getbssid(vap, wh))); 928 if (type == NULL) { 929 printf("%s frame, ", ieee80211_mgt_subtype_name[ 930 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 931 IEEE80211_FC0_SUBTYPE_SHIFT]); 932 } else 933 printf("%s frame, ", type); 934 va_start(ap, fmt); 935 vprintf(fmt, ap); 936 va_end(ap); 937 printf("\n"); 938 } 939 940 void 941 ieee80211_discard_ie(const struct ieee80211vap *vap, 942 const struct ieee80211_frame *wh, 943 const char *type, const char *fmt, ...) 944 { 945 va_list ap; 946 947 if_printf(vap->iv_ifp, "[%s] discard ", 948 ether_sprintf(ieee80211_getbssid(vap, wh))); 949 if (type != NULL) 950 printf("%s information element, ", type); 951 else 952 printf("information element, "); 953 va_start(ap, fmt); 954 vprintf(fmt, ap); 955 va_end(ap); 956 printf("\n"); 957 } 958 959 void 960 ieee80211_discard_mac(const struct ieee80211vap *vap, 961 const uint8_t mac[IEEE80211_ADDR_LEN], 962 const char *type, const char *fmt, ...) 963 { 964 va_list ap; 965 966 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 967 if (type != NULL) 968 printf("%s frame, ", type); 969 else 970 printf("frame, "); 971 va_start(ap, fmt); 972 vprintf(fmt, ap); 973 va_end(ap); 974 printf("\n"); 975 } 976 #endif /* IEEE80211_DEBUG */ 977