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 return ni->ni_vap->iv_input(ni, m, rx, rx->rssi, rx->nf); 93 } 94 95 int 96 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf) 97 { 98 struct ieee80211_rx_stats rx; 99 100 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI; 101 rx.nf = nf; 102 rx.rssi = rssi; 103 return ieee80211_input_mimo_all(ic, m, &rx); 104 } 105 106 int 107 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m, 108 struct ieee80211_rx_stats *rx) 109 { 110 struct ieee80211vap *vap; 111 int type = -1; 112 113 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */ 114 115 /* XXX locking */ 116 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 117 struct ieee80211_node *ni; 118 struct mbuf *mcopy; 119 120 /* NB: could check for IFF_UP but this is cheaper */ 121 if (vap->iv_state == IEEE80211_S_INIT) 122 continue; 123 /* 124 * WDS vap's only receive directed traffic from the 125 * station at the ``far end''. That traffic should 126 * be passed through the AP vap the station is associated 127 * to--so don't spam them with mcast frames. 128 */ 129 if (vap->iv_opmode == IEEE80211_M_WDS) 130 continue; 131 if (TAILQ_NEXT(vap, iv_next) != NULL) { 132 /* 133 * Packet contents are changed by ieee80211_decap 134 * so do a deep copy of the packet. 135 */ 136 mcopy = m_dup(m, M_NOWAIT); 137 if (mcopy == NULL) { 138 /* XXX stat+msg */ 139 continue; 140 } 141 } else { 142 mcopy = m; 143 m = NULL; 144 } 145 ni = ieee80211_ref_node(vap->iv_bss); 146 type = ieee80211_input_mimo(ni, mcopy, rx); 147 ieee80211_free_node(ni); 148 } 149 if (m != NULL) /* no vaps, reclaim mbuf */ 150 m_freem(m); 151 return type; 152 } 153 154 /* 155 * This function reassembles fragments. 156 * 157 * XXX should handle 3 concurrent reassemblies per-spec. 158 */ 159 struct mbuf * 160 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace) 161 { 162 struct ieee80211vap *vap = ni->ni_vap; 163 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 164 struct ieee80211_frame *lwh; 165 uint16_t rxseq; 166 uint8_t fragno; 167 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 168 struct mbuf *mfrag; 169 170 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 171 172 rxseq = le16toh(*(uint16_t *)wh->i_seq); 173 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 174 175 /* Quick way out, if there's nothing to defragment */ 176 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 177 return m; 178 179 /* 180 * Remove frag to insure it doesn't get reaped by timer. 181 */ 182 if (ni->ni_table == NULL) { 183 /* 184 * Should never happen. If the node is orphaned (not in 185 * the table) then input packets should not reach here. 186 * Otherwise, a concurrent request that yanks the table 187 * should be blocked by other interlocking and/or by first 188 * shutting the driver down. Regardless, be defensive 189 * here and just bail 190 */ 191 /* XXX need msg+stat */ 192 m_freem(m); 193 return NULL; 194 } 195 IEEE80211_NODE_LOCK(ni->ni_table); 196 mfrag = ni->ni_rxfrag[0]; 197 ni->ni_rxfrag[0] = NULL; 198 IEEE80211_NODE_UNLOCK(ni->ni_table); 199 200 /* 201 * Validate new fragment is in order and 202 * related to the previous ones. 203 */ 204 if (mfrag != NULL) { 205 uint16_t last_rxseq; 206 207 lwh = mtod(mfrag, struct ieee80211_frame *); 208 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 209 /* NB: check seq # and frag together */ 210 if (rxseq != last_rxseq+1 || 211 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || 212 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 213 /* 214 * Unrelated fragment or no space for it, 215 * clear current fragments. 216 */ 217 m_freem(mfrag); 218 mfrag = NULL; 219 } 220 } 221 222 if (mfrag == NULL) { 223 if (fragno != 0) { /* !first fragment, discard */ 224 vap->iv_stats.is_rx_defrag++; 225 IEEE80211_NODE_STAT(ni, rx_defrag); 226 m_freem(m); 227 return NULL; 228 } 229 mfrag = m; 230 } else { /* concatenate */ 231 m_adj(m, hdrspace); /* strip header */ 232 m_cat(mfrag, m); 233 /* NB: m_cat doesn't update the packet header */ 234 mfrag->m_pkthdr.len += m->m_pkthdr.len; 235 /* track last seqnum and fragno */ 236 lwh = mtod(mfrag, struct ieee80211_frame *); 237 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 238 } 239 if (more_frag) { /* more to come, save */ 240 ni->ni_rxfragstamp = ticks; 241 ni->ni_rxfrag[0] = mfrag; 242 mfrag = NULL; 243 } 244 return mfrag; 245 } 246 247 void 248 ieee80211_deliver_data(struct ieee80211vap *vap, 249 struct ieee80211_node *ni, struct mbuf *m) 250 { 251 struct ether_header *eh = mtod(m, struct ether_header *); 252 struct ifnet *ifp = vap->iv_ifp; 253 254 /* clear driver/net80211 flags before passing up */ 255 m->m_flags &= ~(M_MCAST | M_BCAST); 256 m_clrprotoflags(m); 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 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 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 *) 451 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN, 452 M_80211_NODE, IEEE80211_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_channel *rxchan, 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, rxchan); 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 (bchan=%u)", 652 scan->chan, scan->bchan); 653 vap->iv_stats.is_rx_chanmismatch++; 654 scan->status |= IEEE80211_BPARSE_OFFCHAN; 655 } 656 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 657 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 658 IEEE80211_DISCARD(vap, 659 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 660 wh, NULL, "bogus beacon interval (%d TU)", 661 (int) scan->bintval); 662 vap->iv_stats.is_rx_badbintval++; 663 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 664 } 665 if (scan->country != NULL) { 666 /* 667 * Validate we have at least enough data to extract 668 * the country code. Not sure if we should return an 669 * error instead of discarding the IE; consider this 670 * being lenient as we don't depend on the data for 671 * correct operation. 672 */ 673 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 674 scan->country = NULL); 675 } 676 if (scan->csa != NULL) { 677 /* 678 * Validate Channel Switch Announcement; this must 679 * be the correct length or we toss the frame. 680 */ 681 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 682 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 683 } 684 /* 685 * Process HT ie's. This is complicated by our 686 * accepting both the standard ie's and the pre-draft 687 * vendor OUI ie's that some vendors still use/require. 688 */ 689 if (scan->htcap != NULL) { 690 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 691 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 692 4 + sizeof(struct ieee80211_ie_htcap)-2 : 693 sizeof(struct ieee80211_ie_htcap)-2, 694 scan->htcap = NULL); 695 } 696 if (scan->htinfo != NULL) { 697 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 698 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 699 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 700 sizeof(struct ieee80211_ie_htinfo)-2, 701 scan->htinfo = NULL); 702 } 703 return scan->status; 704 } 705 706 /* 707 * Parse an Action frame. Return 0 on success, non-zero on failure. 708 */ 709 int 710 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 711 { 712 struct ieee80211vap *vap = ni->ni_vap; 713 const struct ieee80211_action *ia; 714 struct ieee80211_frame *wh; 715 uint8_t *frm, *efrm; 716 717 /* 718 * action frame format: 719 * [1] category 720 * [1] action 721 * [tlv] parameters 722 */ 723 wh = mtod(m, struct ieee80211_frame *); 724 frm = (u_int8_t *)&wh[1]; 725 efrm = mtod(m, u_int8_t *) + m->m_len; 726 IEEE80211_VERIFY_LENGTH(efrm - frm, 727 sizeof(struct ieee80211_action), return EINVAL); 728 ia = (const struct ieee80211_action *) frm; 729 730 vap->iv_stats.is_rx_action++; 731 IEEE80211_NODE_STAT(ni, rx_action); 732 733 /* verify frame payloads but defer processing */ 734 switch (ia->ia_category) { 735 case IEEE80211_ACTION_CAT_BA: 736 switch (ia->ia_action) { 737 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 738 IEEE80211_VERIFY_LENGTH(efrm - frm, 739 sizeof(struct ieee80211_action_ba_addbarequest), 740 return EINVAL); 741 break; 742 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 743 IEEE80211_VERIFY_LENGTH(efrm - frm, 744 sizeof(struct ieee80211_action_ba_addbaresponse), 745 return EINVAL); 746 break; 747 case IEEE80211_ACTION_BA_DELBA: 748 IEEE80211_VERIFY_LENGTH(efrm - frm, 749 sizeof(struct ieee80211_action_ba_delba), 750 return EINVAL); 751 break; 752 } 753 break; 754 case IEEE80211_ACTION_CAT_HT: 755 switch (ia->ia_action) { 756 case IEEE80211_ACTION_HT_TXCHWIDTH: 757 IEEE80211_VERIFY_LENGTH(efrm - frm, 758 sizeof(struct ieee80211_action_ht_txchwidth), 759 return EINVAL); 760 break; 761 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 762 IEEE80211_VERIFY_LENGTH(efrm - frm, 763 sizeof(struct ieee80211_action_ht_mimopowersave), 764 return EINVAL); 765 break; 766 } 767 break; 768 #ifdef IEEE80211_SUPPORT_MESH 769 case IEEE80211_ACTION_CAT_MESH: 770 switch (ia->ia_action) { 771 case IEEE80211_ACTION_MESH_LMETRIC: 772 /* 773 * XXX: verification is true only if we are using 774 * Airtime link metric (default) 775 */ 776 IEEE80211_VERIFY_LENGTH(efrm - frm, 777 sizeof(struct ieee80211_meshlmetric_ie), 778 return EINVAL); 779 break; 780 case IEEE80211_ACTION_MESH_HWMP: 781 /* verify something */ 782 break; 783 case IEEE80211_ACTION_MESH_GANN: 784 IEEE80211_VERIFY_LENGTH(efrm - frm, 785 sizeof(struct ieee80211_meshgann_ie), 786 return EINVAL); 787 break; 788 case IEEE80211_ACTION_MESH_CC: 789 case IEEE80211_ACTION_MESH_MCCA_SREQ: 790 case IEEE80211_ACTION_MESH_MCCA_SREP: 791 case IEEE80211_ACTION_MESH_MCCA_AREQ: 792 case IEEE80211_ACTION_MESH_MCCA_ADVER: 793 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 794 case IEEE80211_ACTION_MESH_TBTT_REQ: 795 case IEEE80211_ACTION_MESH_TBTT_RES: 796 /* reject these early on, not implemented */ 797 IEEE80211_DISCARD(vap, 798 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 799 wh, NULL, "not implemented yet, act=0x%02X", 800 ia->ia_action); 801 return EINVAL; 802 } 803 break; 804 case IEEE80211_ACTION_CAT_SELF_PROT: 805 /* If TA or RA group address discard silently */ 806 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 807 IEEE80211_IS_MULTICAST(wh->i_addr2)) 808 return EINVAL; 809 /* 810 * XXX: Should we verify complete length now or it is 811 * to varying in sizes? 812 */ 813 switch (ia->ia_action) { 814 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 815 case IEEE80211_ACTION_MESHPEERING_CLOSE: 816 /* is not a peering candidate (yet) */ 817 if (ni == vap->iv_bss) 818 return EINVAL; 819 break; 820 } 821 break; 822 #endif 823 } 824 return 0; 825 } 826 827 #ifdef IEEE80211_DEBUG 828 /* 829 * Debugging support. 830 */ 831 void 832 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 833 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 834 { 835 printf("[%s] discard %s frame, ssid mismatch: ", 836 ether_sprintf(mac), tag); 837 ieee80211_print_essid(ssid + 2, ssid[1]); 838 printf("\n"); 839 } 840 841 /* 842 * Return the bssid of a frame. 843 */ 844 static const uint8_t * 845 ieee80211_getbssid(const struct ieee80211vap *vap, 846 const struct ieee80211_frame *wh) 847 { 848 if (vap->iv_opmode == IEEE80211_M_STA) 849 return wh->i_addr2; 850 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 851 return wh->i_addr1; 852 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 853 return wh->i_addr1; 854 return wh->i_addr3; 855 } 856 857 #include <machine/stdarg.h> 858 859 void 860 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 861 { 862 char buf[128]; /* XXX */ 863 va_list ap; 864 865 va_start(ap, fmt); 866 vsnprintf(buf, sizeof(buf), fmt, ap); 867 va_end(ap); 868 869 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 870 } 871 872 void 873 ieee80211_note_frame(const struct ieee80211vap *vap, 874 const struct ieee80211_frame *wh, 875 const char *fmt, ...) 876 { 877 char buf[128]; /* XXX */ 878 va_list ap; 879 880 va_start(ap, fmt); 881 vsnprintf(buf, sizeof(buf), fmt, ap); 882 va_end(ap); 883 if_printf(vap->iv_ifp, "[%s] %s\n", 884 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 885 } 886 887 void 888 ieee80211_note_mac(const struct ieee80211vap *vap, 889 const uint8_t mac[IEEE80211_ADDR_LEN], 890 const char *fmt, ...) 891 { 892 char buf[128]; /* XXX */ 893 va_list ap; 894 895 va_start(ap, fmt); 896 vsnprintf(buf, sizeof(buf), fmt, ap); 897 va_end(ap); 898 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 899 } 900 901 void 902 ieee80211_discard_frame(const struct ieee80211vap *vap, 903 const struct ieee80211_frame *wh, 904 const char *type, const char *fmt, ...) 905 { 906 va_list ap; 907 908 if_printf(vap->iv_ifp, "[%s] discard ", 909 ether_sprintf(ieee80211_getbssid(vap, wh))); 910 if (type == NULL) { 911 printf("%s frame, ", ieee80211_mgt_subtype_name[ 912 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 913 IEEE80211_FC0_SUBTYPE_SHIFT]); 914 } else 915 printf("%s frame, ", type); 916 va_start(ap, fmt); 917 vprintf(fmt, ap); 918 va_end(ap); 919 printf("\n"); 920 } 921 922 void 923 ieee80211_discard_ie(const struct ieee80211vap *vap, 924 const struct ieee80211_frame *wh, 925 const char *type, const char *fmt, ...) 926 { 927 va_list ap; 928 929 if_printf(vap->iv_ifp, "[%s] discard ", 930 ether_sprintf(ieee80211_getbssid(vap, wh))); 931 if (type != NULL) 932 printf("%s information element, ", type); 933 else 934 printf("information element, "); 935 va_start(ap, fmt); 936 vprintf(fmt, ap); 937 va_end(ap); 938 printf("\n"); 939 } 940 941 void 942 ieee80211_discard_mac(const struct ieee80211vap *vap, 943 const uint8_t mac[IEEE80211_ADDR_LEN], 944 const char *type, const char *fmt, ...) 945 { 946 va_list ap; 947 948 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 949 if (type != NULL) 950 printf("%s frame, ", type); 951 else 952 printf("frame, "); 953 va_start(ap, fmt); 954 vprintf(fmt, ap); 955 va_end(ap); 956 printf("\n"); 957 } 958 #endif /* IEEE80211_DEBUG */ 959