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/vlan/if_vlan_var.h> 47 48 #include <netproto/802_11/ieee80211_var.h> 49 #include <netproto/802_11/ieee80211_input.h> 50 #ifdef IEEE80211_SUPPORT_MESH 51 #include <netproto/802_11/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 IFNET_STAT_INC(ifp, 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 #if defined(__DragonFly__) 277 m->m_pkthdr.ether_vlantag = ni->ni_vlan; 278 #else 279 m->m_pkthdr.ether_vtag = ni->ni_vlan; 280 #endif 281 m->m_flags |= M_VLANTAG; 282 } 283 ifp->if_input(ifp, m, NULL, -1); 284 } 285 286 struct mbuf * 287 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 288 { 289 struct ieee80211_qosframe_addr4 wh; 290 struct ether_header *eh; 291 struct llc *llc; 292 293 KASSERT(hdrlen <= sizeof(wh), 294 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 295 296 if (m->m_len < hdrlen + sizeof(*llc) && 297 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 298 vap->iv_stats.is_rx_tooshort++; 299 /* XXX msg */ 300 return NULL; 301 } 302 memcpy(&wh, mtod(m, caddr_t), hdrlen); 303 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 304 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 305 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 306 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 307 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 308 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 309 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 310 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 311 llc = NULL; 312 } else { 313 m_adj(m, hdrlen - sizeof(*eh)); 314 } 315 eh = mtod(m, struct ether_header *); 316 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 317 case IEEE80211_FC1_DIR_NODS: 318 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 319 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 320 break; 321 case IEEE80211_FC1_DIR_TODS: 322 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 323 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 324 break; 325 case IEEE80211_FC1_DIR_FROMDS: 326 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 327 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 328 break; 329 case IEEE80211_FC1_DIR_DSTODS: 330 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 331 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 332 break; 333 } 334 #ifndef __NO_STRICT_ALIGNMENT 335 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 336 m = ieee80211_realign(vap, m, sizeof(*eh)); 337 if (m == NULL) 338 return NULL; 339 } 340 #endif /* !__NO_STRICT_ALIGNMENT */ 341 if (llc != NULL) { 342 eh = mtod(m, struct ether_header *); 343 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 344 } 345 return m; 346 } 347 348 /* 349 * Decap a frame encapsulated in a fast-frame/A-MSDU. 350 */ 351 struct mbuf * 352 ieee80211_decap1(struct mbuf *m, int *framelen) 353 { 354 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 355 struct ether_header *eh; 356 struct llc *llc; 357 358 /* 359 * The frame has an 802.3 header followed by an 802.2 360 * LLC header. The encapsulated frame length is in the 361 * first header type field; save that and overwrite it 362 * with the true type field found in the second. Then 363 * copy the 802.3 header up to where it belongs and 364 * adjust the mbuf contents to remove the void. 365 */ 366 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 367 return NULL; 368 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 369 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 370 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 371 + sizeof(struct ether_header) - sizeof(struct llc); 372 eh->ether_type = llc->llc_un.type_snap.ether_type; 373 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 374 sizeof(struct ether_header)); 375 m_adj(m, sizeof(struct llc)); 376 return m; 377 #undef FF_LLC_SIZE 378 } 379 380 /* 381 * Install received rate set information in the node's state block. 382 */ 383 int 384 ieee80211_setup_rates(struct ieee80211_node *ni, 385 const uint8_t *rates, const uint8_t *xrates, int flags) 386 { 387 struct ieee80211vap *vap = ni->ni_vap; 388 struct ieee80211_rateset *rs = &ni->ni_rates; 389 390 memset(rs, 0, sizeof(*rs)); 391 rs->rs_nrates = rates[1]; 392 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 393 if (xrates != NULL) { 394 uint8_t nxrates; 395 /* 396 * Tack on 11g extended supported rate element. 397 */ 398 nxrates = xrates[1]; 399 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 400 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 401 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 402 "extended rate set too large; only using " 403 "%u of %u rates", nxrates, xrates[1]); 404 vap->iv_stats.is_rx_rstoobig++; 405 } 406 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 407 rs->rs_nrates += nxrates; 408 } 409 return ieee80211_fix_rate(ni, rs, flags); 410 } 411 412 /* 413 * Send a management frame error response to the specified 414 * station. If ni is associated with the station then use 415 * it; otherwise allocate a temporary node suitable for 416 * transmitting the frame and then free the reference so 417 * it will go away as soon as the frame has been transmitted. 418 */ 419 void 420 ieee80211_send_error(struct ieee80211_node *ni, 421 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 422 { 423 struct ieee80211vap *vap = ni->ni_vap; 424 int istmp; 425 426 if (ni == vap->iv_bss) { 427 if (vap->iv_state != IEEE80211_S_RUN) { 428 /* 429 * XXX hack until we get rid of this routine. 430 * We can be called prior to the vap reaching 431 * run state under certain conditions in which 432 * case iv_bss->ni_chan will not be setup. 433 * Check for this explicitly and and just ignore 434 * the request. 435 */ 436 return; 437 } 438 ni = ieee80211_tmp_node(vap, mac); 439 if (ni == NULL) { 440 /* XXX msg */ 441 return; 442 } 443 istmp = 1; 444 } else 445 istmp = 0; 446 IEEE80211_SEND_MGMT(ni, subtype, arg); 447 if (istmp) 448 ieee80211_free_node(ni); 449 } 450 451 int 452 ieee80211_alloc_challenge(struct ieee80211_node *ni) 453 { 454 if (ni->ni_challenge == NULL) 455 ni->ni_challenge = (uint32_t *) kmalloc(IEEE80211_CHALLENGE_LEN, 456 M_80211_NODE, M_INTWAIT); 457 if (ni->ni_challenge == NULL) { 458 IEEE80211_NOTE(ni->ni_vap, 459 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 460 "%s", "shared key challenge alloc failed"); 461 /* XXX statistic */ 462 } 463 return (ni->ni_challenge != NULL); 464 } 465 466 /* 467 * Parse a Beacon or ProbeResponse frame and return the 468 * useful information in an ieee80211_scanparams structure. 469 * Status is set to 0 if no problems were found; otherwise 470 * a bitmask of IEEE80211_BPARSE_* items is returned that 471 * describes the problems detected. 472 */ 473 int 474 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 475 struct ieee80211_scanparams *scan) 476 { 477 struct ieee80211vap *vap = ni->ni_vap; 478 struct ieee80211com *ic = ni->ni_ic; 479 struct ieee80211_frame *wh; 480 uint8_t *frm, *efrm; 481 482 wh = mtod(m, struct ieee80211_frame *); 483 frm = (uint8_t *)&wh[1]; 484 efrm = mtod(m, uint8_t *) + m->m_len; 485 scan->status = 0; 486 /* 487 * beacon/probe response frame format 488 * [8] time stamp 489 * [2] beacon interval 490 * [2] capability information 491 * [tlv] ssid 492 * [tlv] supported rates 493 * [tlv] country information 494 * [tlv] channel switch announcement (CSA) 495 * [tlv] parameter set (FH/DS) 496 * [tlv] erp information 497 * [tlv] extended supported rates 498 * [tlv] WME 499 * [tlv] WPA or RSN 500 * [tlv] HT capabilities 501 * [tlv] HT information 502 * [tlv] Atheros capabilities 503 * [tlv] Mesh ID 504 * [tlv] Mesh Configuration 505 */ 506 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 507 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 508 memset(scan, 0, sizeof(*scan)); 509 scan->tstamp = frm; frm += 8; 510 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 511 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 512 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 513 scan->chan = scan->bchan; 514 scan->ies = frm; 515 scan->ies_len = efrm - frm; 516 517 while (efrm - frm > 1) { 518 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 519 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 520 switch (*frm) { 521 case IEEE80211_ELEMID_SSID: 522 scan->ssid = frm; 523 break; 524 case IEEE80211_ELEMID_RATES: 525 scan->rates = frm; 526 break; 527 case IEEE80211_ELEMID_COUNTRY: 528 scan->country = frm; 529 break; 530 case IEEE80211_ELEMID_CSA: 531 scan->csa = frm; 532 break; 533 case IEEE80211_ELEMID_QUIET: 534 scan->quiet = frm; 535 break; 536 case IEEE80211_ELEMID_FHPARMS: 537 if (ic->ic_phytype == IEEE80211_T_FH) { 538 scan->fhdwell = LE_READ_2(&frm[2]); 539 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 540 scan->fhindex = frm[6]; 541 } 542 break; 543 case IEEE80211_ELEMID_DSPARMS: 544 /* 545 * XXX hack this since depending on phytype 546 * is problematic for multi-mode devices. 547 */ 548 if (ic->ic_phytype != IEEE80211_T_FH) 549 scan->chan = frm[2]; 550 break; 551 case IEEE80211_ELEMID_TIM: 552 /* XXX ATIM? */ 553 scan->tim = frm; 554 scan->timoff = frm - mtod(m, uint8_t *); 555 break; 556 case IEEE80211_ELEMID_IBSSPARMS: 557 case IEEE80211_ELEMID_CFPARMS: 558 case IEEE80211_ELEMID_PWRCNSTR: 559 /* NB: avoid debugging complaints */ 560 break; 561 case IEEE80211_ELEMID_XRATES: 562 scan->xrates = frm; 563 break; 564 case IEEE80211_ELEMID_ERP: 565 if (frm[1] != 1) { 566 IEEE80211_DISCARD_IE(vap, 567 IEEE80211_MSG_ELEMID, wh, "ERP", 568 "bad len %u", frm[1]); 569 vap->iv_stats.is_rx_elem_toobig++; 570 break; 571 } 572 scan->erp = frm[2] | 0x100; 573 break; 574 case IEEE80211_ELEMID_HTCAP: 575 scan->htcap = frm; 576 break; 577 case IEEE80211_ELEMID_RSN: 578 scan->rsn = frm; 579 break; 580 case IEEE80211_ELEMID_HTINFO: 581 scan->htinfo = frm; 582 break; 583 #ifdef IEEE80211_SUPPORT_MESH 584 case IEEE80211_ELEMID_MESHID: 585 scan->meshid = frm; 586 break; 587 case IEEE80211_ELEMID_MESHCONF: 588 scan->meshconf = frm; 589 break; 590 #endif 591 case IEEE80211_ELEMID_VENDOR: 592 if (iswpaoui(frm)) 593 scan->wpa = frm; 594 else if (iswmeparam(frm) || iswmeinfo(frm)) 595 scan->wme = frm; 596 #ifdef IEEE80211_SUPPORT_SUPERG 597 else if (isatherosoui(frm)) 598 scan->ath = frm; 599 #endif 600 #ifdef IEEE80211_SUPPORT_TDMA 601 else if (istdmaoui(frm)) 602 scan->tdma = frm; 603 #endif 604 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 605 /* 606 * Accept pre-draft HT ie's if the 607 * standard ones have not been seen. 608 */ 609 if (ishtcapoui(frm)) { 610 if (scan->htcap == NULL) 611 scan->htcap = frm; 612 } else if (ishtinfooui(frm)) { 613 if (scan->htinfo == NULL) 614 scan->htcap = frm; 615 } 616 } 617 break; 618 default: 619 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 620 wh, "unhandled", 621 "id %u, len %u", *frm, frm[1]); 622 vap->iv_stats.is_rx_elem_unknown++; 623 break; 624 } 625 frm += frm[1] + 2; 626 } 627 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 628 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 629 if (scan->rates != NULL && scan->xrates != NULL) { 630 /* 631 * NB: don't process XRATES if RATES is missing. This 632 * avoids a potential null ptr deref and should be ok 633 * as the return code will already note RATES is missing 634 * (so callers shouldn't otherwise process the frame). 635 */ 636 IEEE80211_VERIFY_ELEMENT(scan->xrates, 637 IEEE80211_RATE_MAXSIZE - scan->rates[1], 638 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 639 } 640 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 641 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 642 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 643 /* 644 * Frame was received on a channel different from the 645 * one indicated in the DS params element id; 646 * silently discard it. 647 * 648 * NB: this can happen due to signal leakage. 649 * But we should take it for FH phy because 650 * the rssi value should be correct even for 651 * different hop pattern in FH. 652 */ 653 IEEE80211_DISCARD(vap, 654 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 655 wh, NULL, "for off-channel %u", scan->chan); 656 vap->iv_stats.is_rx_chanmismatch++; 657 scan->status |= IEEE80211_BPARSE_OFFCHAN; 658 } 659 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 660 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 661 IEEE80211_DISCARD(vap, 662 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 663 wh, NULL, "bogus beacon interval (%d TU)", 664 (int) scan->bintval); 665 vap->iv_stats.is_rx_badbintval++; 666 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 667 } 668 if (scan->country != NULL) { 669 /* 670 * Validate we have at least enough data to extract 671 * the country code. Not sure if we should return an 672 * error instead of discarding the IE; consider this 673 * being lenient as we don't depend on the data for 674 * correct operation. 675 */ 676 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 677 scan->country = NULL); 678 } 679 if (scan->csa != NULL) { 680 /* 681 * Validate Channel Switch Announcement; this must 682 * be the correct length or we toss the frame. 683 */ 684 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 685 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 686 } 687 /* 688 * Process HT ie's. This is complicated by our 689 * accepting both the standard ie's and the pre-draft 690 * vendor OUI ie's that some vendors still use/require. 691 */ 692 if (scan->htcap != NULL) { 693 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 694 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 695 4 + sizeof(struct ieee80211_ie_htcap)-2 : 696 sizeof(struct ieee80211_ie_htcap)-2, 697 scan->htcap = NULL); 698 } 699 if (scan->htinfo != NULL) { 700 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 701 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 702 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 703 sizeof(struct ieee80211_ie_htinfo)-2, 704 scan->htinfo = NULL); 705 } 706 return scan->status; 707 } 708 709 /* 710 * Parse an Action frame. Return 0 on success, non-zero on failure. 711 */ 712 int 713 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 714 { 715 struct ieee80211vap *vap = ni->ni_vap; 716 const struct ieee80211_action *ia; 717 struct ieee80211_frame *wh; 718 uint8_t *frm, *efrm; 719 720 /* 721 * action frame format: 722 * [1] category 723 * [1] action 724 * [tlv] parameters 725 */ 726 wh = mtod(m, struct ieee80211_frame *); 727 frm = (u_int8_t *)&wh[1]; 728 efrm = mtod(m, u_int8_t *) + m->m_len; 729 IEEE80211_VERIFY_LENGTH(efrm - frm, 730 sizeof(struct ieee80211_action), return EINVAL); 731 ia = (const struct ieee80211_action *) frm; 732 733 vap->iv_stats.is_rx_action++; 734 IEEE80211_NODE_STAT(ni, rx_action); 735 736 /* verify frame payloads but defer processing */ 737 switch (ia->ia_category) { 738 case IEEE80211_ACTION_CAT_BA: 739 switch (ia->ia_action) { 740 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 741 IEEE80211_VERIFY_LENGTH(efrm - frm, 742 sizeof(struct ieee80211_action_ba_addbarequest), 743 return EINVAL); 744 break; 745 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 746 IEEE80211_VERIFY_LENGTH(efrm - frm, 747 sizeof(struct ieee80211_action_ba_addbaresponse), 748 return EINVAL); 749 break; 750 case IEEE80211_ACTION_BA_DELBA: 751 IEEE80211_VERIFY_LENGTH(efrm - frm, 752 sizeof(struct ieee80211_action_ba_delba), 753 return EINVAL); 754 break; 755 } 756 break; 757 case IEEE80211_ACTION_CAT_HT: 758 switch (ia->ia_action) { 759 case IEEE80211_ACTION_HT_TXCHWIDTH: 760 IEEE80211_VERIFY_LENGTH(efrm - frm, 761 sizeof(struct ieee80211_action_ht_txchwidth), 762 return EINVAL); 763 break; 764 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 765 IEEE80211_VERIFY_LENGTH(efrm - frm, 766 sizeof(struct ieee80211_action_ht_mimopowersave), 767 return EINVAL); 768 break; 769 } 770 break; 771 #ifdef IEEE80211_SUPPORT_MESH 772 case IEEE80211_ACTION_CAT_MESH: 773 switch (ia->ia_action) { 774 case IEEE80211_ACTION_MESH_LMETRIC: 775 /* 776 * XXX: verification is true only if we are using 777 * Airtime link metric (default) 778 */ 779 IEEE80211_VERIFY_LENGTH(efrm - frm, 780 sizeof(struct ieee80211_meshlmetric_ie), 781 return EINVAL); 782 break; 783 case IEEE80211_ACTION_MESH_HWMP: 784 /* verify something */ 785 break; 786 case IEEE80211_ACTION_MESH_GANN: 787 IEEE80211_VERIFY_LENGTH(efrm - frm, 788 sizeof(struct ieee80211_meshgann_ie), 789 return EINVAL); 790 break; 791 case IEEE80211_ACTION_MESH_CC: 792 case IEEE80211_ACTION_MESH_MCCA_SREQ: 793 case IEEE80211_ACTION_MESH_MCCA_SREP: 794 case IEEE80211_ACTION_MESH_MCCA_AREQ: 795 case IEEE80211_ACTION_MESH_MCCA_ADVER: 796 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 797 case IEEE80211_ACTION_MESH_TBTT_REQ: 798 case IEEE80211_ACTION_MESH_TBTT_RES: 799 /* reject these early on, not implemented */ 800 IEEE80211_DISCARD(vap, 801 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 802 wh, NULL, "not implemented yet, act=0x%02X", 803 ia->ia_action); 804 return EINVAL; 805 } 806 break; 807 case IEEE80211_ACTION_CAT_SELF_PROT: 808 /* If TA or RA group address discard silently */ 809 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 810 IEEE80211_IS_MULTICAST(wh->i_addr2)) 811 return EINVAL; 812 /* 813 * XXX: Should we verify complete length now or it is 814 * to varying in sizes? 815 */ 816 switch (ia->ia_action) { 817 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 818 case IEEE80211_ACTION_MESHPEERING_CLOSE: 819 /* is not a peering candidate (yet) */ 820 if (ni == vap->iv_bss) 821 return EINVAL; 822 break; 823 } 824 break; 825 #endif 826 } 827 return 0; 828 } 829 830 #ifdef IEEE80211_DEBUG 831 /* 832 * Debugging support. 833 */ 834 void 835 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 836 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 837 { 838 kprintf("[%s] discard %s frame, ssid mismatch: ", 839 ether_sprintf(mac), tag); 840 ieee80211_print_essid(ssid + 2, ssid[1]); 841 kprintf("\n"); 842 } 843 844 /* 845 * Return the bssid of a frame. 846 */ 847 static const uint8_t * 848 ieee80211_getbssid(const struct ieee80211vap *vap, 849 const struct ieee80211_frame *wh) 850 { 851 if (vap->iv_opmode == IEEE80211_M_STA) 852 return wh->i_addr2; 853 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 854 return wh->i_addr1; 855 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 856 return wh->i_addr1; 857 return wh->i_addr3; 858 } 859 860 #include <machine/stdarg.h> 861 862 void 863 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 864 { 865 char buf[128]; /* XXX */ 866 osdep_va_list ap; 867 868 osdep_va_start(ap, fmt); 869 kvsnprintf(buf, sizeof(buf), fmt, ap); 870 osdep_va_end(ap); 871 872 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 873 } 874 875 void 876 ieee80211_note_frame(const struct ieee80211vap *vap, 877 const struct ieee80211_frame *wh, 878 const char *fmt, ...) 879 { 880 char buf[128]; /* XXX */ 881 osdep_va_list ap; 882 883 osdep_va_start(ap, fmt); 884 kvsnprintf(buf, sizeof(buf), fmt, ap); 885 osdep_va_end(ap); 886 if_printf(vap->iv_ifp, "[%s] %s\n", 887 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 888 } 889 890 void 891 ieee80211_note_mac(const struct ieee80211vap *vap, 892 const uint8_t mac[IEEE80211_ADDR_LEN], 893 const char *fmt, ...) 894 { 895 char buf[128]; /* XXX */ 896 osdep_va_list ap; 897 898 osdep_va_start(ap, fmt); 899 kvsnprintf(buf, sizeof(buf), fmt, ap); 900 osdep_va_end(ap); 901 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 902 } 903 904 void 905 ieee80211_discard_frame(const struct ieee80211vap *vap, 906 const struct ieee80211_frame *wh, 907 const char *type, const char *fmt, ...) 908 { 909 osdep_va_list ap; 910 911 if_printf(vap->iv_ifp, "[%s] discard ", 912 ether_sprintf(ieee80211_getbssid(vap, wh))); 913 if (type == NULL) { 914 kprintf("%s frame, ", ieee80211_mgt_subtype_name[ 915 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 916 IEEE80211_FC0_SUBTYPE_SHIFT]); 917 } else 918 kprintf("%s frame, ", type); 919 osdep_va_start(ap, fmt); 920 kvprintf(fmt, ap); 921 osdep_va_end(ap); 922 kprintf("\n"); 923 } 924 925 void 926 ieee80211_discard_ie(const struct ieee80211vap *vap, 927 const struct ieee80211_frame *wh, 928 const char *type, const char *fmt, ...) 929 { 930 osdep_va_list ap; 931 932 if_printf(vap->iv_ifp, "[%s] discard ", 933 ether_sprintf(ieee80211_getbssid(vap, wh))); 934 if (type != NULL) 935 kprintf("%s information element, ", type); 936 else 937 kprintf("information element, "); 938 osdep_va_start(ap, fmt); 939 kvprintf(fmt, ap); 940 osdep_va_end(ap); 941 kprintf("\n"); 942 } 943 944 void 945 ieee80211_discard_mac(const struct ieee80211vap *vap, 946 const uint8_t mac[IEEE80211_ADDR_LEN], 947 const char *type, const char *fmt, ...) 948 { 949 osdep_va_list ap; 950 951 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 952 if (type != NULL) 953 kprintf("%s frame, ", type); 954 else 955 kprintf("frame, "); 956 osdep_va_start(ap, fmt); 957 kvprintf(fmt, ap); 958 osdep_va_end(ap); 959 kprintf("\n"); 960 } 961 #endif /* IEEE80211_DEBUG */ 962