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 /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */ 90 ieee80211_process_mimo(ni, rx); 91 return ieee80211_input(ni, m, rx->rssi, rx->nf); 92 } 93 94 int 95 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf) 96 { 97 struct ieee80211_rx_stats rx; 98 99 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI; 100 rx.nf = nf; 101 rx.rssi = rssi; 102 return ieee80211_input_mimo_all(ic, m, &rx); 103 } 104 105 int 106 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m, 107 struct ieee80211_rx_stats *rx) 108 { 109 struct ieee80211vap *vap; 110 int type = -1; 111 112 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */ 113 114 /* XXX locking */ 115 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 116 struct ieee80211_node *ni; 117 struct mbuf *mcopy; 118 119 /* NB: could check for IFF_UP but this is cheaper */ 120 if (vap->iv_state == IEEE80211_S_INIT) 121 continue; 122 /* 123 * WDS vap's only receive directed traffic from the 124 * station at the ``far end''. That traffic should 125 * be passed through the AP vap the station is associated 126 * to--so don't spam them with mcast frames. 127 */ 128 if (vap->iv_opmode == IEEE80211_M_WDS) 129 continue; 130 if (TAILQ_NEXT(vap, iv_next) != NULL) { 131 /* 132 * Packet contents are changed by ieee80211_decap 133 * so do a deep copy of the packet. 134 */ 135 mcopy = m_dup(m, M_NOWAIT); 136 if (mcopy == NULL) { 137 /* XXX stat+msg */ 138 continue; 139 } 140 } else { 141 mcopy = m; 142 m = NULL; 143 } 144 ni = ieee80211_ref_node(vap->iv_bss); 145 type = ieee80211_input_mimo(ni, mcopy, rx); 146 ieee80211_free_node(ni); 147 } 148 if (m != NULL) /* no vaps, reclaim mbuf */ 149 m_freem(m); 150 return type; 151 } 152 153 /* 154 * This function reassembles fragments. 155 * 156 * XXX should handle 3 concurrent reassemblies per-spec. 157 */ 158 struct mbuf * 159 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace) 160 { 161 struct ieee80211vap *vap = ni->ni_vap; 162 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 163 struct ieee80211_frame *lwh; 164 uint16_t rxseq; 165 uint8_t fragno; 166 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 167 struct mbuf *mfrag; 168 169 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 170 171 rxseq = le16toh(*(uint16_t *)wh->i_seq); 172 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 173 174 /* Quick way out, if there's nothing to defragment */ 175 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 176 return m; 177 178 /* 179 * Remove frag to insure it doesn't get reaped by timer. 180 */ 181 if (ni->ni_table == NULL) { 182 /* 183 * Should never happen. If the node is orphaned (not in 184 * the table) then input packets should not reach here. 185 * Otherwise, a concurrent request that yanks the table 186 * should be blocked by other interlocking and/or by first 187 * shutting the driver down. Regardless, be defensive 188 * here and just bail 189 */ 190 /* XXX need msg+stat */ 191 m_freem(m); 192 return NULL; 193 } 194 IEEE80211_NODE_LOCK(ni->ni_table); 195 mfrag = ni->ni_rxfrag[0]; 196 ni->ni_rxfrag[0] = NULL; 197 IEEE80211_NODE_UNLOCK(ni->ni_table); 198 199 /* 200 * Validate new fragment is in order and 201 * related to the previous ones. 202 */ 203 if (mfrag != NULL) { 204 uint16_t last_rxseq; 205 206 lwh = mtod(mfrag, struct ieee80211_frame *); 207 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 208 /* NB: check seq # and frag together */ 209 if (rxseq != last_rxseq+1 || 210 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || 211 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 212 /* 213 * Unrelated fragment or no space for it, 214 * clear current fragments. 215 */ 216 m_freem(mfrag); 217 mfrag = NULL; 218 } 219 } 220 221 if (mfrag == NULL) { 222 if (fragno != 0) { /* !first fragment, discard */ 223 vap->iv_stats.is_rx_defrag++; 224 IEEE80211_NODE_STAT(ni, rx_defrag); 225 m_freem(m); 226 return NULL; 227 } 228 mfrag = m; 229 } else { /* concatenate */ 230 m_adj(m, hdrspace); /* strip header */ 231 m_cat(mfrag, m); 232 /* NB: m_cat doesn't update the packet header */ 233 mfrag->m_pkthdr.len += m->m_pkthdr.len; 234 /* track last seqnum and fragno */ 235 lwh = mtod(mfrag, struct ieee80211_frame *); 236 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 237 } 238 if (more_frag) { /* more to come, save */ 239 ni->ni_rxfragstamp = ticks; 240 ni->ni_rxfrag[0] = mfrag; 241 mfrag = NULL; 242 } 243 return mfrag; 244 } 245 246 void 247 ieee80211_deliver_data(struct ieee80211vap *vap, 248 struct ieee80211_node *ni, struct mbuf *m) 249 { 250 struct ether_header *eh = mtod(m, struct ether_header *); 251 struct ifnet *ifp = vap->iv_ifp; 252 253 /* clear driver/net80211 flags before passing up */ 254 m->m_flags &= ~(M_MCAST | M_BCAST); 255 #if __FreeBSD_version >= 1000046 256 m_clrprotoflags(m); 257 #endif 258 259 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 260 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 261 /* 262 * Do accounting. 263 */ 264 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 265 IEEE80211_NODE_STAT(ni, rx_data); 266 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 267 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 268 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 269 IEEE80211_NODE_STAT(ni, rx_mcast); 270 } else 271 IEEE80211_NODE_STAT(ni, rx_ucast); 272 m->m_pkthdr.rcvif = ifp; 273 274 if (ni->ni_vlan != 0) { 275 /* attach vlan tag */ 276 m->m_pkthdr.ether_vtag = ni->ni_vlan; 277 m->m_flags |= M_VLANTAG; 278 } 279 ifp->if_input(ifp, m); 280 } 281 282 struct mbuf * 283 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 284 { 285 struct ieee80211_qosframe_addr4 wh; 286 struct ether_header *eh; 287 struct llc *llc; 288 289 KASSERT(hdrlen <= sizeof(wh), 290 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 291 292 if (m->m_len < hdrlen + sizeof(*llc) && 293 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 294 vap->iv_stats.is_rx_tooshort++; 295 /* XXX msg */ 296 return NULL; 297 } 298 memcpy(&wh, mtod(m, caddr_t), hdrlen); 299 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 300 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 301 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 302 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 303 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 304 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 305 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 306 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 307 llc = NULL; 308 } else { 309 m_adj(m, hdrlen - sizeof(*eh)); 310 } 311 eh = mtod(m, struct ether_header *); 312 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 313 case IEEE80211_FC1_DIR_NODS: 314 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 315 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 316 break; 317 case IEEE80211_FC1_DIR_TODS: 318 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 319 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 320 break; 321 case IEEE80211_FC1_DIR_FROMDS: 322 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 323 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 324 break; 325 case IEEE80211_FC1_DIR_DSTODS: 326 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 327 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 328 break; 329 } 330 #ifndef __NO_STRICT_ALIGNMENT 331 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 332 m = ieee80211_realign(vap, m, sizeof(*eh)); 333 if (m == NULL) 334 return NULL; 335 } 336 #endif /* !__NO_STRICT_ALIGNMENT */ 337 if (llc != NULL) { 338 eh = mtod(m, struct ether_header *); 339 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 340 } 341 return m; 342 } 343 344 /* 345 * Decap a frame encapsulated in a fast-frame/A-MSDU. 346 */ 347 struct mbuf * 348 ieee80211_decap1(struct mbuf *m, int *framelen) 349 { 350 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 351 struct ether_header *eh; 352 struct llc *llc; 353 354 /* 355 * The frame has an 802.3 header followed by an 802.2 356 * LLC header. The encapsulated frame length is in the 357 * first header type field; save that and overwrite it 358 * with the true type field found in the second. Then 359 * copy the 802.3 header up to where it belongs and 360 * adjust the mbuf contents to remove the void. 361 */ 362 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 363 return NULL; 364 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 365 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 366 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 367 + sizeof(struct ether_header) - sizeof(struct llc); 368 eh->ether_type = llc->llc_un.type_snap.ether_type; 369 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 370 sizeof(struct ether_header)); 371 m_adj(m, sizeof(struct llc)); 372 return m; 373 #undef FF_LLC_SIZE 374 } 375 376 /* 377 * Install received rate set information in the node's state block. 378 */ 379 int 380 ieee80211_setup_rates(struct ieee80211_node *ni, 381 const uint8_t *rates, const uint8_t *xrates, int flags) 382 { 383 struct ieee80211vap *vap = ni->ni_vap; 384 struct ieee80211_rateset *rs = &ni->ni_rates; 385 386 memset(rs, 0, sizeof(*rs)); 387 rs->rs_nrates = rates[1]; 388 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 389 if (xrates != NULL) { 390 uint8_t nxrates; 391 /* 392 * Tack on 11g extended supported rate element. 393 */ 394 nxrates = xrates[1]; 395 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 396 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 397 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 398 "extended rate set too large; only using " 399 "%u of %u rates", nxrates, xrates[1]); 400 vap->iv_stats.is_rx_rstoobig++; 401 } 402 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 403 rs->rs_nrates += nxrates; 404 } 405 return ieee80211_fix_rate(ni, rs, flags); 406 } 407 408 /* 409 * Send a management frame error response to the specified 410 * station. If ni is associated with the station then use 411 * it; otherwise allocate a temporary node suitable for 412 * transmitting the frame and then free the reference so 413 * it will go away as soon as the frame has been transmitted. 414 */ 415 void 416 ieee80211_send_error(struct ieee80211_node *ni, 417 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 418 { 419 struct ieee80211vap *vap = ni->ni_vap; 420 int istmp; 421 422 if (ni == vap->iv_bss) { 423 if (vap->iv_state != IEEE80211_S_RUN) { 424 /* 425 * XXX hack until we get rid of this routine. 426 * We can be called prior to the vap reaching 427 * run state under certain conditions in which 428 * case iv_bss->ni_chan will not be setup. 429 * Check for this explicitly and and just ignore 430 * the request. 431 */ 432 return; 433 } 434 ni = ieee80211_tmp_node(vap, mac); 435 if (ni == NULL) { 436 /* XXX msg */ 437 return; 438 } 439 istmp = 1; 440 } else 441 istmp = 0; 442 IEEE80211_SEND_MGMT(ni, subtype, arg); 443 if (istmp) 444 ieee80211_free_node(ni); 445 } 446 447 int 448 ieee80211_alloc_challenge(struct ieee80211_node *ni) 449 { 450 if (ni->ni_challenge == NULL) 451 ni->ni_challenge = (uint32_t *) malloc(IEEE80211_CHALLENGE_LEN, 452 M_80211_NODE, M_NOWAIT); 453 if (ni->ni_challenge == NULL) { 454 IEEE80211_NOTE(ni->ni_vap, 455 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 456 "%s", "shared key challenge alloc failed"); 457 /* XXX statistic */ 458 } 459 return (ni->ni_challenge != NULL); 460 } 461 462 /* 463 * Parse a Beacon or ProbeResponse frame and return the 464 * useful information in an ieee80211_scanparams structure. 465 * Status is set to 0 if no problems were found; otherwise 466 * a bitmask of IEEE80211_BPARSE_* items is returned that 467 * describes the problems detected. 468 */ 469 int 470 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 471 struct ieee80211_scanparams *scan) 472 { 473 struct ieee80211vap *vap = ni->ni_vap; 474 struct ieee80211com *ic = ni->ni_ic; 475 struct ieee80211_frame *wh; 476 uint8_t *frm, *efrm; 477 478 wh = mtod(m, struct ieee80211_frame *); 479 frm = (uint8_t *)&wh[1]; 480 efrm = mtod(m, uint8_t *) + m->m_len; 481 scan->status = 0; 482 /* 483 * beacon/probe response frame format 484 * [8] time stamp 485 * [2] beacon interval 486 * [2] capability information 487 * [tlv] ssid 488 * [tlv] supported rates 489 * [tlv] country information 490 * [tlv] channel switch announcement (CSA) 491 * [tlv] parameter set (FH/DS) 492 * [tlv] erp information 493 * [tlv] extended supported rates 494 * [tlv] WME 495 * [tlv] WPA or RSN 496 * [tlv] HT capabilities 497 * [tlv] HT information 498 * [tlv] Atheros capabilities 499 * [tlv] Mesh ID 500 * [tlv] Mesh Configuration 501 */ 502 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 503 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 504 memset(scan, 0, sizeof(*scan)); 505 scan->tstamp = frm; frm += 8; 506 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 507 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 508 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 509 scan->chan = scan->bchan; 510 scan->ies = frm; 511 scan->ies_len = efrm - frm; 512 513 while (efrm - frm > 1) { 514 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 515 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 516 switch (*frm) { 517 case IEEE80211_ELEMID_SSID: 518 scan->ssid = frm; 519 break; 520 case IEEE80211_ELEMID_RATES: 521 scan->rates = frm; 522 break; 523 case IEEE80211_ELEMID_COUNTRY: 524 scan->country = frm; 525 break; 526 case IEEE80211_ELEMID_CSA: 527 scan->csa = frm; 528 break; 529 case IEEE80211_ELEMID_QUIET: 530 scan->quiet = frm; 531 break; 532 case IEEE80211_ELEMID_FHPARMS: 533 if (ic->ic_phytype == IEEE80211_T_FH) { 534 scan->fhdwell = LE_READ_2(&frm[2]); 535 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 536 scan->fhindex = frm[6]; 537 } 538 break; 539 case IEEE80211_ELEMID_DSPARMS: 540 /* 541 * XXX hack this since depending on phytype 542 * is problematic for multi-mode devices. 543 */ 544 if (ic->ic_phytype != IEEE80211_T_FH) 545 scan->chan = frm[2]; 546 break; 547 case IEEE80211_ELEMID_TIM: 548 /* XXX ATIM? */ 549 scan->tim = frm; 550 scan->timoff = frm - mtod(m, uint8_t *); 551 break; 552 case IEEE80211_ELEMID_IBSSPARMS: 553 case IEEE80211_ELEMID_CFPARMS: 554 case IEEE80211_ELEMID_PWRCNSTR: 555 /* NB: avoid debugging complaints */ 556 break; 557 case IEEE80211_ELEMID_XRATES: 558 scan->xrates = frm; 559 break; 560 case IEEE80211_ELEMID_ERP: 561 if (frm[1] != 1) { 562 IEEE80211_DISCARD_IE(vap, 563 IEEE80211_MSG_ELEMID, wh, "ERP", 564 "bad len %u", frm[1]); 565 vap->iv_stats.is_rx_elem_toobig++; 566 break; 567 } 568 scan->erp = frm[2] | 0x100; 569 break; 570 case IEEE80211_ELEMID_HTCAP: 571 scan->htcap = frm; 572 break; 573 case IEEE80211_ELEMID_RSN: 574 scan->rsn = frm; 575 break; 576 case IEEE80211_ELEMID_HTINFO: 577 scan->htinfo = frm; 578 break; 579 #ifdef IEEE80211_SUPPORT_MESH 580 case IEEE80211_ELEMID_MESHID: 581 scan->meshid = frm; 582 break; 583 case IEEE80211_ELEMID_MESHCONF: 584 scan->meshconf = frm; 585 break; 586 #endif 587 case IEEE80211_ELEMID_VENDOR: 588 if (iswpaoui(frm)) 589 scan->wpa = frm; 590 else if (iswmeparam(frm) || iswmeinfo(frm)) 591 scan->wme = frm; 592 #ifdef IEEE80211_SUPPORT_SUPERG 593 else if (isatherosoui(frm)) 594 scan->ath = frm; 595 #endif 596 #ifdef IEEE80211_SUPPORT_TDMA 597 else if (istdmaoui(frm)) 598 scan->tdma = frm; 599 #endif 600 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 601 /* 602 * Accept pre-draft HT ie's if the 603 * standard ones have not been seen. 604 */ 605 if (ishtcapoui(frm)) { 606 if (scan->htcap == NULL) 607 scan->htcap = frm; 608 } else if (ishtinfooui(frm)) { 609 if (scan->htinfo == NULL) 610 scan->htcap = frm; 611 } 612 } 613 break; 614 default: 615 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 616 wh, "unhandled", 617 "id %u, len %u", *frm, frm[1]); 618 vap->iv_stats.is_rx_elem_unknown++; 619 break; 620 } 621 frm += frm[1] + 2; 622 } 623 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 624 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 625 if (scan->rates != NULL && scan->xrates != NULL) { 626 /* 627 * NB: don't process XRATES if RATES is missing. This 628 * avoids a potential null ptr deref and should be ok 629 * as the return code will already note RATES is missing 630 * (so callers shouldn't otherwise process the frame). 631 */ 632 IEEE80211_VERIFY_ELEMENT(scan->xrates, 633 IEEE80211_RATE_MAXSIZE - scan->rates[1], 634 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 635 } 636 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 637 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 638 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 639 /* 640 * Frame was received on a channel different from the 641 * one indicated in the DS params element id; 642 * silently discard it. 643 * 644 * NB: this can happen due to signal leakage. 645 * But we should take it for FH phy because 646 * the rssi value should be correct even for 647 * different hop pattern in FH. 648 */ 649 IEEE80211_DISCARD(vap, 650 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 651 wh, NULL, "for off-channel %u", scan->chan); 652 vap->iv_stats.is_rx_chanmismatch++; 653 scan->status |= IEEE80211_BPARSE_OFFCHAN; 654 } 655 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 656 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 657 IEEE80211_DISCARD(vap, 658 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 659 wh, NULL, "bogus beacon interval (%d TU)", 660 (int) scan->bintval); 661 vap->iv_stats.is_rx_badbintval++; 662 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 663 } 664 if (scan->country != NULL) { 665 /* 666 * Validate we have at least enough data to extract 667 * the country code. Not sure if we should return an 668 * error instead of discarding the IE; consider this 669 * being lenient as we don't depend on the data for 670 * correct operation. 671 */ 672 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 673 scan->country = NULL); 674 } 675 if (scan->csa != NULL) { 676 /* 677 * Validate Channel Switch Announcement; this must 678 * be the correct length or we toss the frame. 679 */ 680 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 681 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 682 } 683 /* 684 * Process HT ie's. This is complicated by our 685 * accepting both the standard ie's and the pre-draft 686 * vendor OUI ie's that some vendors still use/require. 687 */ 688 if (scan->htcap != NULL) { 689 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 690 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 691 4 + sizeof(struct ieee80211_ie_htcap)-2 : 692 sizeof(struct ieee80211_ie_htcap)-2, 693 scan->htcap = NULL); 694 } 695 if (scan->htinfo != NULL) { 696 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 697 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 698 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 699 sizeof(struct ieee80211_ie_htinfo)-2, 700 scan->htinfo = NULL); 701 } 702 return scan->status; 703 } 704 705 /* 706 * Parse an Action frame. Return 0 on success, non-zero on failure. 707 */ 708 int 709 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 710 { 711 struct ieee80211vap *vap = ni->ni_vap; 712 const struct ieee80211_action *ia; 713 struct ieee80211_frame *wh; 714 uint8_t *frm, *efrm; 715 716 /* 717 * action frame format: 718 * [1] category 719 * [1] action 720 * [tlv] parameters 721 */ 722 wh = mtod(m, struct ieee80211_frame *); 723 frm = (u_int8_t *)&wh[1]; 724 efrm = mtod(m, u_int8_t *) + m->m_len; 725 IEEE80211_VERIFY_LENGTH(efrm - frm, 726 sizeof(struct ieee80211_action), return EINVAL); 727 ia = (const struct ieee80211_action *) frm; 728 729 vap->iv_stats.is_rx_action++; 730 IEEE80211_NODE_STAT(ni, rx_action); 731 732 /* verify frame payloads but defer processing */ 733 switch (ia->ia_category) { 734 case IEEE80211_ACTION_CAT_BA: 735 switch (ia->ia_action) { 736 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 737 IEEE80211_VERIFY_LENGTH(efrm - frm, 738 sizeof(struct ieee80211_action_ba_addbarequest), 739 return EINVAL); 740 break; 741 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 742 IEEE80211_VERIFY_LENGTH(efrm - frm, 743 sizeof(struct ieee80211_action_ba_addbaresponse), 744 return EINVAL); 745 break; 746 case IEEE80211_ACTION_BA_DELBA: 747 IEEE80211_VERIFY_LENGTH(efrm - frm, 748 sizeof(struct ieee80211_action_ba_delba), 749 return EINVAL); 750 break; 751 } 752 break; 753 case IEEE80211_ACTION_CAT_HT: 754 switch (ia->ia_action) { 755 case IEEE80211_ACTION_HT_TXCHWIDTH: 756 IEEE80211_VERIFY_LENGTH(efrm - frm, 757 sizeof(struct ieee80211_action_ht_txchwidth), 758 return EINVAL); 759 break; 760 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 761 IEEE80211_VERIFY_LENGTH(efrm - frm, 762 sizeof(struct ieee80211_action_ht_mimopowersave), 763 return EINVAL); 764 break; 765 } 766 break; 767 #ifdef IEEE80211_SUPPORT_MESH 768 case IEEE80211_ACTION_CAT_MESH: 769 switch (ia->ia_action) { 770 case IEEE80211_ACTION_MESH_LMETRIC: 771 /* 772 * XXX: verification is true only if we are using 773 * Airtime link metric (default) 774 */ 775 IEEE80211_VERIFY_LENGTH(efrm - frm, 776 sizeof(struct ieee80211_meshlmetric_ie), 777 return EINVAL); 778 break; 779 case IEEE80211_ACTION_MESH_HWMP: 780 /* verify something */ 781 break; 782 case IEEE80211_ACTION_MESH_GANN: 783 IEEE80211_VERIFY_LENGTH(efrm - frm, 784 sizeof(struct ieee80211_meshgann_ie), 785 return EINVAL); 786 break; 787 case IEEE80211_ACTION_MESH_CC: 788 case IEEE80211_ACTION_MESH_MCCA_SREQ: 789 case IEEE80211_ACTION_MESH_MCCA_SREP: 790 case IEEE80211_ACTION_MESH_MCCA_AREQ: 791 case IEEE80211_ACTION_MESH_MCCA_ADVER: 792 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 793 case IEEE80211_ACTION_MESH_TBTT_REQ: 794 case IEEE80211_ACTION_MESH_TBTT_RES: 795 /* reject these early on, not implemented */ 796 IEEE80211_DISCARD(vap, 797 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 798 wh, NULL, "not implemented yet, act=0x%02X", 799 ia->ia_action); 800 return EINVAL; 801 } 802 break; 803 case IEEE80211_ACTION_CAT_SELF_PROT: 804 /* If TA or RA group address discard silently */ 805 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 806 IEEE80211_IS_MULTICAST(wh->i_addr2)) 807 return EINVAL; 808 /* 809 * XXX: Should we verify complete length now or it is 810 * to varying in sizes? 811 */ 812 switch (ia->ia_action) { 813 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 814 case IEEE80211_ACTION_MESHPEERING_CLOSE: 815 /* is not a peering candidate (yet) */ 816 if (ni == vap->iv_bss) 817 return EINVAL; 818 break; 819 } 820 break; 821 #endif 822 } 823 return 0; 824 } 825 826 #ifdef IEEE80211_DEBUG 827 /* 828 * Debugging support. 829 */ 830 void 831 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 832 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 833 { 834 printf("[%s] discard %s frame, ssid mismatch: ", 835 ether_sprintf(mac), tag); 836 ieee80211_print_essid(ssid + 2, ssid[1]); 837 printf("\n"); 838 } 839 840 /* 841 * Return the bssid of a frame. 842 */ 843 static const uint8_t * 844 ieee80211_getbssid(const struct ieee80211vap *vap, 845 const struct ieee80211_frame *wh) 846 { 847 if (vap->iv_opmode == IEEE80211_M_STA) 848 return wh->i_addr2; 849 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 850 return wh->i_addr1; 851 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 852 return wh->i_addr1; 853 return wh->i_addr3; 854 } 855 856 #include <machine/stdarg.h> 857 858 void 859 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 860 { 861 char buf[128]; /* XXX */ 862 va_list ap; 863 864 va_start(ap, fmt); 865 vsnprintf(buf, sizeof(buf), fmt, ap); 866 va_end(ap); 867 868 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 869 } 870 871 void 872 ieee80211_note_frame(const struct ieee80211vap *vap, 873 const struct ieee80211_frame *wh, 874 const char *fmt, ...) 875 { 876 char buf[128]; /* XXX */ 877 va_list ap; 878 879 va_start(ap, fmt); 880 vsnprintf(buf, sizeof(buf), fmt, ap); 881 va_end(ap); 882 if_printf(vap->iv_ifp, "[%s] %s\n", 883 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 884 } 885 886 void 887 ieee80211_note_mac(const struct ieee80211vap *vap, 888 const uint8_t mac[IEEE80211_ADDR_LEN], 889 const char *fmt, ...) 890 { 891 char buf[128]; /* XXX */ 892 va_list ap; 893 894 va_start(ap, fmt); 895 vsnprintf(buf, sizeof(buf), fmt, ap); 896 va_end(ap); 897 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 898 } 899 900 void 901 ieee80211_discard_frame(const struct ieee80211vap *vap, 902 const struct ieee80211_frame *wh, 903 const char *type, const char *fmt, ...) 904 { 905 va_list ap; 906 907 if_printf(vap->iv_ifp, "[%s] discard ", 908 ether_sprintf(ieee80211_getbssid(vap, wh))); 909 if (type == NULL) { 910 printf("%s frame, ", ieee80211_mgt_subtype_name[ 911 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 912 IEEE80211_FC0_SUBTYPE_SHIFT]); 913 } else 914 printf("%s frame, ", type); 915 va_start(ap, fmt); 916 vprintf(fmt, ap); 917 va_end(ap); 918 printf("\n"); 919 } 920 921 void 922 ieee80211_discard_ie(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 information element, ", type); 932 else 933 printf("information element, "); 934 va_start(ap, fmt); 935 vprintf(fmt, ap); 936 va_end(ap); 937 printf("\n"); 938 } 939 940 void 941 ieee80211_discard_mac(const struct ieee80211vap *vap, 942 const uint8_t mac[IEEE80211_ADDR_LEN], 943 const char *type, const char *fmt, ...) 944 { 945 va_list ap; 946 947 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 948 if (type != NULL) 949 printf("%s frame, ", type); 950 else 951 printf("frame, "); 952 va_start(ap, fmt); 953 vprintf(fmt, ap); 954 va_end(ap); 955 printf("\n"); 956 } 957 #endif /* IEEE80211_DEBUG */ 958