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_llc.h> 44 #include <net/if_media.h> 45 #include <net/if_vlan_var.h> 46 47 #include <net80211/ieee80211_var.h> 48 #include <net80211/ieee80211_input.h> 49 #ifdef IEEE80211_SUPPORT_MESH 50 #include <net80211/ieee80211_mesh.h> 51 #endif 52 53 #include <net/bpf.h> 54 55 #ifdef INET 56 #include <netinet/in.h> 57 #include <net/ethernet.h> 58 #endif 59 60 static void 61 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx) 62 { 63 int i; 64 65 /* Verify the required MIMO bits are set */ 66 if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) != 67 (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) 68 return; 69 70 /* XXX This assumes the MIMO radios have both ctl and ext chains */ 71 for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) { 72 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]); 73 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]); 74 } 75 76 /* XXX This also assumes the MIMO radios have both ctl and ext chains */ 77 for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) { 78 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i]; 79 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i]; 80 } 81 ni->ni_mimo_chains = rx->c_chain; 82 } 83 84 int 85 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m, 86 struct ieee80211_rx_stats *rx) 87 { 88 /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */ 89 ieee80211_process_mimo(ni, rx); 90 return ieee80211_input(ni, m, rx->rssi, rx->nf); 91 } 92 93 int 94 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf) 95 { 96 struct ieee80211_rx_stats rx; 97 98 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI; 99 rx.nf = nf; 100 rx.rssi = rssi; 101 return ieee80211_input_mimo_all(ic, m, &rx); 102 } 103 104 int 105 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m, 106 struct ieee80211_rx_stats *rx) 107 { 108 struct ieee80211vap *vap; 109 int type = -1; 110 111 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */ 112 113 /* XXX locking */ 114 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 115 struct ieee80211_node *ni; 116 struct mbuf *mcopy; 117 118 /* NB: could check for IFF_UP but this is cheaper */ 119 if (vap->iv_state == IEEE80211_S_INIT) 120 continue; 121 /* 122 * WDS vap's only receive directed traffic from the 123 * station at the ``far end''. That traffic should 124 * be passed through the AP vap the station is associated 125 * to--so don't spam them with mcast frames. 126 */ 127 if (vap->iv_opmode == IEEE80211_M_WDS) 128 continue; 129 if (TAILQ_NEXT(vap, iv_next) != NULL) { 130 /* 131 * Packet contents are changed by ieee80211_decap 132 * so do a deep copy of the packet. 133 */ 134 mcopy = m_dup(m, M_NOWAIT); 135 if (mcopy == NULL) { 136 /* XXX stat+msg */ 137 continue; 138 } 139 } else { 140 mcopy = m; 141 m = NULL; 142 } 143 ni = ieee80211_ref_node(vap->iv_bss); 144 type = ieee80211_input_mimo(ni, mcopy, rx); 145 ieee80211_free_node(ni); 146 } 147 if (m != NULL) /* no vaps, reclaim mbuf */ 148 m_freem(m); 149 return type; 150 } 151 152 /* 153 * This function reassembles fragments. 154 * 155 * XXX should handle 3 concurrent reassemblies per-spec. 156 */ 157 struct mbuf * 158 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace) 159 { 160 struct ieee80211vap *vap = ni->ni_vap; 161 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 162 struct ieee80211_frame *lwh; 163 uint16_t rxseq; 164 uint8_t fragno; 165 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 166 struct mbuf *mfrag; 167 168 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 169 170 rxseq = le16toh(*(uint16_t *)wh->i_seq); 171 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 172 173 /* Quick way out, if there's nothing to defragment */ 174 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 175 return m; 176 177 /* 178 * Remove frag to insure it doesn't get reaped by timer. 179 */ 180 if (ni->ni_table == NULL) { 181 /* 182 * Should never happen. If the node is orphaned (not in 183 * the table) then input packets should not reach here. 184 * Otherwise, a concurrent request that yanks the table 185 * should be blocked by other interlocking and/or by first 186 * shutting the driver down. Regardless, be defensive 187 * here and just bail 188 */ 189 /* XXX need msg+stat */ 190 m_freem(m); 191 return NULL; 192 } 193 IEEE80211_NODE_LOCK(ni->ni_table); 194 mfrag = ni->ni_rxfrag[0]; 195 ni->ni_rxfrag[0] = NULL; 196 IEEE80211_NODE_UNLOCK(ni->ni_table); 197 198 /* 199 * Validate new fragment is in order and 200 * related to the previous ones. 201 */ 202 if (mfrag != NULL) { 203 uint16_t last_rxseq; 204 205 lwh = mtod(mfrag, struct ieee80211_frame *); 206 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 207 /* NB: check seq # and frag together */ 208 if (rxseq != last_rxseq+1 || 209 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || 210 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 211 /* 212 * Unrelated fragment or no space for it, 213 * clear current fragments. 214 */ 215 m_freem(mfrag); 216 mfrag = NULL; 217 } 218 } 219 220 if (mfrag == NULL) { 221 if (fragno != 0) { /* !first fragment, discard */ 222 vap->iv_stats.is_rx_defrag++; 223 IEEE80211_NODE_STAT(ni, rx_defrag); 224 m_freem(m); 225 return NULL; 226 } 227 mfrag = m; 228 } else { /* concatenate */ 229 m_adj(m, hdrspace); /* strip header */ 230 m_cat(mfrag, m); 231 /* NB: m_cat doesn't update the packet header */ 232 mfrag->m_pkthdr.len += m->m_pkthdr.len; 233 /* track last seqnum and fragno */ 234 lwh = mtod(mfrag, struct ieee80211_frame *); 235 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 236 } 237 if (more_frag) { /* more to come, save */ 238 ni->ni_rxfragstamp = ticks; 239 ni->ni_rxfrag[0] = mfrag; 240 mfrag = NULL; 241 } 242 return mfrag; 243 } 244 245 void 246 ieee80211_deliver_data(struct ieee80211vap *vap, 247 struct ieee80211_node *ni, struct mbuf *m) 248 { 249 struct ether_header *eh = mtod(m, struct ether_header *); 250 struct ifnet *ifp = vap->iv_ifp; 251 252 /* clear driver/net80211 flags before passing up */ 253 m->m_flags &= ~(M_MCAST | M_BCAST); 254 #if __FreeBSD_version >= 1000046 255 m_clrprotoflags(m); 256 #endif 257 258 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 259 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 260 /* 261 * Do accounting. 262 */ 263 ifp->if_ipackets++; 264 IEEE80211_NODE_STAT(ni, rx_data); 265 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 266 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 267 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 268 IEEE80211_NODE_STAT(ni, rx_mcast); 269 } else 270 IEEE80211_NODE_STAT(ni, rx_ucast); 271 m->m_pkthdr.rcvif = ifp; 272 273 if (ni->ni_vlan != 0) { 274 /* attach vlan tag */ 275 m->m_pkthdr.ether_vtag = ni->ni_vlan; 276 m->m_flags |= M_VLANTAG; 277 } 278 ifp->if_input(ifp, m); 279 } 280 281 struct mbuf * 282 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 283 { 284 struct ieee80211_qosframe_addr4 wh; 285 struct ether_header *eh; 286 struct llc *llc; 287 288 KASSERT(hdrlen <= sizeof(wh), 289 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 290 291 if (m->m_len < hdrlen + sizeof(*llc) && 292 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 293 vap->iv_stats.is_rx_tooshort++; 294 /* XXX msg */ 295 return NULL; 296 } 297 memcpy(&wh, mtod(m, caddr_t), hdrlen); 298 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 299 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 300 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 301 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 302 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 303 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 304 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 305 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 306 llc = NULL; 307 } else { 308 m_adj(m, hdrlen - sizeof(*eh)); 309 } 310 eh = mtod(m, struct ether_header *); 311 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 312 case IEEE80211_FC1_DIR_NODS: 313 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 314 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 315 break; 316 case IEEE80211_FC1_DIR_TODS: 317 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 318 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 319 break; 320 case IEEE80211_FC1_DIR_FROMDS: 321 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 322 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 323 break; 324 case IEEE80211_FC1_DIR_DSTODS: 325 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 326 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 327 break; 328 } 329 #ifndef __NO_STRICT_ALIGNMENT 330 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 331 m = ieee80211_realign(vap, m, sizeof(*eh)); 332 if (m == NULL) 333 return NULL; 334 } 335 #endif /* !__NO_STRICT_ALIGNMENT */ 336 if (llc != NULL) { 337 eh = mtod(m, struct ether_header *); 338 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 339 } 340 return m; 341 } 342 343 /* 344 * Decap a frame encapsulated in a fast-frame/A-MSDU. 345 */ 346 struct mbuf * 347 ieee80211_decap1(struct mbuf *m, int *framelen) 348 { 349 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 350 struct ether_header *eh; 351 struct llc *llc; 352 353 /* 354 * The frame has an 802.3 header followed by an 802.2 355 * LLC header. The encapsulated frame length is in the 356 * first header type field; save that and overwrite it 357 * with the true type field found in the second. Then 358 * copy the 802.3 header up to where it belongs and 359 * adjust the mbuf contents to remove the void. 360 */ 361 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 362 return NULL; 363 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 364 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 365 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 366 + sizeof(struct ether_header) - sizeof(struct llc); 367 eh->ether_type = llc->llc_un.type_snap.ether_type; 368 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 369 sizeof(struct ether_header)); 370 m_adj(m, sizeof(struct llc)); 371 return m; 372 #undef FF_LLC_SIZE 373 } 374 375 /* 376 * Install received rate set information in the node's state block. 377 */ 378 int 379 ieee80211_setup_rates(struct ieee80211_node *ni, 380 const uint8_t *rates, const uint8_t *xrates, int flags) 381 { 382 struct ieee80211vap *vap = ni->ni_vap; 383 struct ieee80211_rateset *rs = &ni->ni_rates; 384 385 memset(rs, 0, sizeof(*rs)); 386 rs->rs_nrates = rates[1]; 387 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 388 if (xrates != NULL) { 389 uint8_t nxrates; 390 /* 391 * Tack on 11g extended supported rate element. 392 */ 393 nxrates = xrates[1]; 394 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 395 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 396 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 397 "extended rate set too large; only using " 398 "%u of %u rates", nxrates, xrates[1]); 399 vap->iv_stats.is_rx_rstoobig++; 400 } 401 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 402 rs->rs_nrates += nxrates; 403 } 404 return ieee80211_fix_rate(ni, rs, flags); 405 } 406 407 /* 408 * Send a management frame error response to the specified 409 * station. If ni is associated with the station then use 410 * it; otherwise allocate a temporary node suitable for 411 * transmitting the frame and then free the reference so 412 * it will go away as soon as the frame has been transmitted. 413 */ 414 void 415 ieee80211_send_error(struct ieee80211_node *ni, 416 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 417 { 418 struct ieee80211vap *vap = ni->ni_vap; 419 int istmp; 420 421 if (ni == vap->iv_bss) { 422 if (vap->iv_state != IEEE80211_S_RUN) { 423 /* 424 * XXX hack until we get rid of this routine. 425 * We can be called prior to the vap reaching 426 * run state under certain conditions in which 427 * case iv_bss->ni_chan will not be setup. 428 * Check for this explicitly and and just ignore 429 * the request. 430 */ 431 return; 432 } 433 ni = ieee80211_tmp_node(vap, mac); 434 if (ni == NULL) { 435 /* XXX msg */ 436 return; 437 } 438 istmp = 1; 439 } else 440 istmp = 0; 441 IEEE80211_SEND_MGMT(ni, subtype, arg); 442 if (istmp) 443 ieee80211_free_node(ni); 444 } 445 446 int 447 ieee80211_alloc_challenge(struct ieee80211_node *ni) 448 { 449 if (ni->ni_challenge == NULL) 450 ni->ni_challenge = (uint32_t *) malloc(IEEE80211_CHALLENGE_LEN, 451 M_80211_NODE, M_NOWAIT); 452 if (ni->ni_challenge == NULL) { 453 IEEE80211_NOTE(ni->ni_vap, 454 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 455 "%s", "shared key challenge alloc failed"); 456 /* XXX statistic */ 457 } 458 return (ni->ni_challenge != NULL); 459 } 460 461 /* 462 * Parse a Beacon or ProbeResponse frame and return the 463 * useful information in an ieee80211_scanparams structure. 464 * Status is set to 0 if no problems were found; otherwise 465 * a bitmask of IEEE80211_BPARSE_* items is returned that 466 * describes the problems detected. 467 */ 468 int 469 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 470 struct ieee80211_scanparams *scan) 471 { 472 struct ieee80211vap *vap = ni->ni_vap; 473 struct ieee80211com *ic = ni->ni_ic; 474 struct ieee80211_frame *wh; 475 uint8_t *frm, *efrm; 476 477 wh = mtod(m, struct ieee80211_frame *); 478 frm = (uint8_t *)&wh[1]; 479 efrm = mtod(m, uint8_t *) + m->m_len; 480 scan->status = 0; 481 /* 482 * beacon/probe response frame format 483 * [8] time stamp 484 * [2] beacon interval 485 * [2] capability information 486 * [tlv] ssid 487 * [tlv] supported rates 488 * [tlv] country information 489 * [tlv] channel switch announcement (CSA) 490 * [tlv] parameter set (FH/DS) 491 * [tlv] erp information 492 * [tlv] extended supported rates 493 * [tlv] WME 494 * [tlv] WPA or RSN 495 * [tlv] HT capabilities 496 * [tlv] HT information 497 * [tlv] Atheros capabilities 498 * [tlv] Mesh ID 499 * [tlv] Mesh Configuration 500 */ 501 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 502 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 503 memset(scan, 0, sizeof(*scan)); 504 scan->tstamp = frm; frm += 8; 505 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 506 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 507 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 508 scan->chan = scan->bchan; 509 scan->ies = frm; 510 scan->ies_len = efrm - frm; 511 512 while (efrm - frm > 1) { 513 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 514 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 515 switch (*frm) { 516 case IEEE80211_ELEMID_SSID: 517 scan->ssid = frm; 518 break; 519 case IEEE80211_ELEMID_RATES: 520 scan->rates = frm; 521 break; 522 case IEEE80211_ELEMID_COUNTRY: 523 scan->country = frm; 524 break; 525 case IEEE80211_ELEMID_CSA: 526 scan->csa = frm; 527 break; 528 case IEEE80211_ELEMID_QUIET: 529 scan->quiet = frm; 530 break; 531 case IEEE80211_ELEMID_FHPARMS: 532 if (ic->ic_phytype == IEEE80211_T_FH) { 533 scan->fhdwell = LE_READ_2(&frm[2]); 534 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 535 scan->fhindex = frm[6]; 536 } 537 break; 538 case IEEE80211_ELEMID_DSPARMS: 539 /* 540 * XXX hack this since depending on phytype 541 * is problematic for multi-mode devices. 542 */ 543 if (ic->ic_phytype != IEEE80211_T_FH) 544 scan->chan = frm[2]; 545 break; 546 case IEEE80211_ELEMID_TIM: 547 /* XXX ATIM? */ 548 scan->tim = frm; 549 scan->timoff = frm - mtod(m, uint8_t *); 550 break; 551 case IEEE80211_ELEMID_IBSSPARMS: 552 case IEEE80211_ELEMID_CFPARMS: 553 case IEEE80211_ELEMID_PWRCNSTR: 554 /* NB: avoid debugging complaints */ 555 break; 556 case IEEE80211_ELEMID_XRATES: 557 scan->xrates = frm; 558 break; 559 case IEEE80211_ELEMID_ERP: 560 if (frm[1] != 1) { 561 IEEE80211_DISCARD_IE(vap, 562 IEEE80211_MSG_ELEMID, wh, "ERP", 563 "bad len %u", frm[1]); 564 vap->iv_stats.is_rx_elem_toobig++; 565 break; 566 } 567 scan->erp = frm[2] | 0x100; 568 break; 569 case IEEE80211_ELEMID_HTCAP: 570 scan->htcap = frm; 571 break; 572 case IEEE80211_ELEMID_RSN: 573 scan->rsn = frm; 574 break; 575 case IEEE80211_ELEMID_HTINFO: 576 scan->htinfo = frm; 577 break; 578 #ifdef IEEE80211_SUPPORT_MESH 579 case IEEE80211_ELEMID_MESHID: 580 scan->meshid = frm; 581 break; 582 case IEEE80211_ELEMID_MESHCONF: 583 scan->meshconf = frm; 584 break; 585 #endif 586 case IEEE80211_ELEMID_VENDOR: 587 if (iswpaoui(frm)) 588 scan->wpa = frm; 589 else if (iswmeparam(frm) || iswmeinfo(frm)) 590 scan->wme = frm; 591 #ifdef IEEE80211_SUPPORT_SUPERG 592 else if (isatherosoui(frm)) 593 scan->ath = frm; 594 #endif 595 #ifdef IEEE80211_SUPPORT_TDMA 596 else if (istdmaoui(frm)) 597 scan->tdma = frm; 598 #endif 599 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 600 /* 601 * Accept pre-draft HT ie's if the 602 * standard ones have not been seen. 603 */ 604 if (ishtcapoui(frm)) { 605 if (scan->htcap == NULL) 606 scan->htcap = frm; 607 } else if (ishtinfooui(frm)) { 608 if (scan->htinfo == NULL) 609 scan->htcap = frm; 610 } 611 } 612 break; 613 default: 614 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 615 wh, "unhandled", 616 "id %u, len %u", *frm, frm[1]); 617 vap->iv_stats.is_rx_elem_unknown++; 618 break; 619 } 620 frm += frm[1] + 2; 621 } 622 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 623 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 624 if (scan->rates != NULL && scan->xrates != NULL) { 625 /* 626 * NB: don't process XRATES if RATES is missing. This 627 * avoids a potential null ptr deref and should be ok 628 * as the return code will already note RATES is missing 629 * (so callers shouldn't otherwise process the frame). 630 */ 631 IEEE80211_VERIFY_ELEMENT(scan->xrates, 632 IEEE80211_RATE_MAXSIZE - scan->rates[1], 633 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 634 } 635 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 636 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 637 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 638 /* 639 * Frame was received on a channel different from the 640 * one indicated in the DS params element id; 641 * silently discard it. 642 * 643 * NB: this can happen due to signal leakage. 644 * But we should take it for FH phy because 645 * the rssi value should be correct even for 646 * different hop pattern in FH. 647 */ 648 IEEE80211_DISCARD(vap, 649 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 650 wh, NULL, "for off-channel %u", scan->chan); 651 vap->iv_stats.is_rx_chanmismatch++; 652 scan->status |= IEEE80211_BPARSE_OFFCHAN; 653 } 654 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 655 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 656 IEEE80211_DISCARD(vap, 657 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 658 wh, NULL, "bogus beacon interval (%d TU)", 659 (int) scan->bintval); 660 vap->iv_stats.is_rx_badbintval++; 661 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 662 } 663 if (scan->country != NULL) { 664 /* 665 * Validate we have at least enough data to extract 666 * the country code. Not sure if we should return an 667 * error instead of discarding the IE; consider this 668 * being lenient as we don't depend on the data for 669 * correct operation. 670 */ 671 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 672 scan->country = NULL); 673 } 674 if (scan->csa != NULL) { 675 /* 676 * Validate Channel Switch Announcement; this must 677 * be the correct length or we toss the frame. 678 */ 679 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 680 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 681 } 682 /* 683 * Process HT ie's. This is complicated by our 684 * accepting both the standard ie's and the pre-draft 685 * vendor OUI ie's that some vendors still use/require. 686 */ 687 if (scan->htcap != NULL) { 688 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 689 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 690 4 + sizeof(struct ieee80211_ie_htcap)-2 : 691 sizeof(struct ieee80211_ie_htcap)-2, 692 scan->htcap = NULL); 693 } 694 if (scan->htinfo != NULL) { 695 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 696 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 697 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 698 sizeof(struct ieee80211_ie_htinfo)-2, 699 scan->htinfo = NULL); 700 } 701 return scan->status; 702 } 703 704 /* 705 * Parse an Action frame. Return 0 on success, non-zero on failure. 706 */ 707 int 708 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 709 { 710 struct ieee80211vap *vap = ni->ni_vap; 711 const struct ieee80211_action *ia; 712 struct ieee80211_frame *wh; 713 uint8_t *frm, *efrm; 714 715 /* 716 * action frame format: 717 * [1] category 718 * [1] action 719 * [tlv] parameters 720 */ 721 wh = mtod(m, struct ieee80211_frame *); 722 frm = (u_int8_t *)&wh[1]; 723 efrm = mtod(m, u_int8_t *) + m->m_len; 724 IEEE80211_VERIFY_LENGTH(efrm - frm, 725 sizeof(struct ieee80211_action), return EINVAL); 726 ia = (const struct ieee80211_action *) frm; 727 728 vap->iv_stats.is_rx_action++; 729 IEEE80211_NODE_STAT(ni, rx_action); 730 731 /* verify frame payloads but defer processing */ 732 switch (ia->ia_category) { 733 case IEEE80211_ACTION_CAT_BA: 734 switch (ia->ia_action) { 735 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 736 IEEE80211_VERIFY_LENGTH(efrm - frm, 737 sizeof(struct ieee80211_action_ba_addbarequest), 738 return EINVAL); 739 break; 740 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 741 IEEE80211_VERIFY_LENGTH(efrm - frm, 742 sizeof(struct ieee80211_action_ba_addbaresponse), 743 return EINVAL); 744 break; 745 case IEEE80211_ACTION_BA_DELBA: 746 IEEE80211_VERIFY_LENGTH(efrm - frm, 747 sizeof(struct ieee80211_action_ba_delba), 748 return EINVAL); 749 break; 750 } 751 break; 752 case IEEE80211_ACTION_CAT_HT: 753 switch (ia->ia_action) { 754 case IEEE80211_ACTION_HT_TXCHWIDTH: 755 IEEE80211_VERIFY_LENGTH(efrm - frm, 756 sizeof(struct ieee80211_action_ht_txchwidth), 757 return EINVAL); 758 break; 759 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 760 IEEE80211_VERIFY_LENGTH(efrm - frm, 761 sizeof(struct ieee80211_action_ht_mimopowersave), 762 return EINVAL); 763 break; 764 } 765 break; 766 #ifdef IEEE80211_SUPPORT_MESH 767 case IEEE80211_ACTION_CAT_MESH: 768 switch (ia->ia_action) { 769 case IEEE80211_ACTION_MESH_LMETRIC: 770 /* 771 * XXX: verification is true only if we are using 772 * Airtime link metric (default) 773 */ 774 IEEE80211_VERIFY_LENGTH(efrm - frm, 775 sizeof(struct ieee80211_meshlmetric_ie), 776 return EINVAL); 777 break; 778 case IEEE80211_ACTION_MESH_HWMP: 779 /* verify something */ 780 break; 781 case IEEE80211_ACTION_MESH_GANN: 782 IEEE80211_VERIFY_LENGTH(efrm - frm, 783 sizeof(struct ieee80211_meshgann_ie), 784 return EINVAL); 785 break; 786 case IEEE80211_ACTION_MESH_CC: 787 case IEEE80211_ACTION_MESH_MCCA_SREQ: 788 case IEEE80211_ACTION_MESH_MCCA_SREP: 789 case IEEE80211_ACTION_MESH_MCCA_AREQ: 790 case IEEE80211_ACTION_MESH_MCCA_ADVER: 791 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 792 case IEEE80211_ACTION_MESH_TBTT_REQ: 793 case IEEE80211_ACTION_MESH_TBTT_RES: 794 /* reject these early on, not implemented */ 795 IEEE80211_DISCARD(vap, 796 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 797 wh, NULL, "not implemented yet, act=0x%02X", 798 ia->ia_action); 799 return EINVAL; 800 } 801 break; 802 case IEEE80211_ACTION_CAT_SELF_PROT: 803 /* If TA or RA group address discard silently */ 804 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 805 IEEE80211_IS_MULTICAST(wh->i_addr2)) 806 return EINVAL; 807 /* 808 * XXX: Should we verify complete length now or it is 809 * to varying in sizes? 810 */ 811 switch (ia->ia_action) { 812 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 813 case IEEE80211_ACTION_MESHPEERING_CLOSE: 814 /* is not a peering candidate (yet) */ 815 if (ni == vap->iv_bss) 816 return EINVAL; 817 break; 818 } 819 break; 820 #endif 821 } 822 return 0; 823 } 824 825 #ifdef IEEE80211_DEBUG 826 /* 827 * Debugging support. 828 */ 829 void 830 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 831 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 832 { 833 printf("[%s] discard %s frame, ssid mismatch: ", 834 ether_sprintf(mac), tag); 835 ieee80211_print_essid(ssid + 2, ssid[1]); 836 printf("\n"); 837 } 838 839 /* 840 * Return the bssid of a frame. 841 */ 842 static const uint8_t * 843 ieee80211_getbssid(const struct ieee80211vap *vap, 844 const struct ieee80211_frame *wh) 845 { 846 if (vap->iv_opmode == IEEE80211_M_STA) 847 return wh->i_addr2; 848 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 849 return wh->i_addr1; 850 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 851 return wh->i_addr1; 852 return wh->i_addr3; 853 } 854 855 #include <machine/stdarg.h> 856 857 void 858 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 859 { 860 char buf[128]; /* XXX */ 861 va_list ap; 862 863 va_start(ap, fmt); 864 vsnprintf(buf, sizeof(buf), fmt, ap); 865 va_end(ap); 866 867 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 868 } 869 870 void 871 ieee80211_note_frame(const struct ieee80211vap *vap, 872 const struct ieee80211_frame *wh, 873 const char *fmt, ...) 874 { 875 char buf[128]; /* XXX */ 876 va_list ap; 877 878 va_start(ap, fmt); 879 vsnprintf(buf, sizeof(buf), fmt, ap); 880 va_end(ap); 881 if_printf(vap->iv_ifp, "[%s] %s\n", 882 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 883 } 884 885 void 886 ieee80211_note_mac(const struct ieee80211vap *vap, 887 const uint8_t mac[IEEE80211_ADDR_LEN], 888 const char *fmt, ...) 889 { 890 char buf[128]; /* XXX */ 891 va_list ap; 892 893 va_start(ap, fmt); 894 vsnprintf(buf, sizeof(buf), fmt, ap); 895 va_end(ap); 896 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 897 } 898 899 void 900 ieee80211_discard_frame(const struct ieee80211vap *vap, 901 const struct ieee80211_frame *wh, 902 const char *type, const char *fmt, ...) 903 { 904 va_list ap; 905 906 if_printf(vap->iv_ifp, "[%s] discard ", 907 ether_sprintf(ieee80211_getbssid(vap, wh))); 908 if (type == NULL) { 909 printf("%s frame, ", ieee80211_mgt_subtype_name[ 910 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 911 IEEE80211_FC0_SUBTYPE_SHIFT]); 912 } else 913 printf("%s frame, ", type); 914 va_start(ap, fmt); 915 vprintf(fmt, ap); 916 va_end(ap); 917 printf("\n"); 918 } 919 920 void 921 ieee80211_discard_ie(const struct ieee80211vap *vap, 922 const struct ieee80211_frame *wh, 923 const char *type, const char *fmt, ...) 924 { 925 va_list ap; 926 927 if_printf(vap->iv_ifp, "[%s] discard ", 928 ether_sprintf(ieee80211_getbssid(vap, wh))); 929 if (type != NULL) 930 printf("%s information element, ", type); 931 else 932 printf("information element, "); 933 va_start(ap, fmt); 934 vprintf(fmt, ap); 935 va_end(ap); 936 printf("\n"); 937 } 938 939 void 940 ieee80211_discard_mac(const struct ieee80211vap *vap, 941 const uint8_t mac[IEEE80211_ADDR_LEN], 942 const char *type, const char *fmt, ...) 943 { 944 va_list ap; 945 946 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 947 if (type != NULL) 948 printf("%s frame, ", type); 949 else 950 printf("frame, "); 951 va_start(ap, fmt); 952 vprintf(fmt, ap); 953 va_end(ap); 954 printf("\n"); 955 } 956 #endif /* IEEE80211_DEBUG */ 957