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 #if defined(__DragonFly__) 47 #include <net/vlan/if_vlan_var.h> 48 #else 49 #include <net/if_vlan_var.h> 50 #endif 51 52 #include <netproto/802_11/ieee80211_var.h> 53 #include <netproto/802_11/ieee80211_input.h> 54 #ifdef IEEE80211_SUPPORT_MESH 55 #include <netproto/802_11/ieee80211_mesh.h> 56 #endif 57 58 #include <net/bpf.h> 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 struct ieee80211_rx_stats rxs; 89 90 if (rx) { 91 memcpy(&rxs, rx, sizeof(*rx)); 92 } else { 93 /* try to read from mbuf */ 94 bzero(&rxs, sizeof(rxs)); 95 ieee80211_get_rx_params(m, &rxs); 96 } 97 98 /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */ 99 ieee80211_process_mimo(ni, &rxs); 100 101 //return ieee80211_input(ni, m, rx->rssi, rx->nf); 102 return ni->ni_vap->iv_input(ni, m, &rxs, rxs.rssi, rxs.nf); 103 } 104 105 int 106 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf) 107 { 108 struct ieee80211_rx_stats rx; 109 110 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI; 111 rx.nf = nf; 112 rx.rssi = rssi; 113 return ieee80211_input_mimo_all(ic, m, &rx); 114 } 115 116 int 117 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m, 118 struct ieee80211_rx_stats *rx) 119 { 120 struct ieee80211_rx_stats rxs; 121 struct ieee80211vap *vap; 122 int type = -1; 123 124 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */ 125 126 if (rx) { 127 memcpy(&rxs, rx, sizeof(*rx)); 128 } else { 129 /* try to read from mbuf */ 130 bzero(&rxs, sizeof(rxs)); 131 ieee80211_get_rx_params(m, &rxs); 132 } 133 134 /* XXX locking */ 135 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 136 struct ieee80211_node *ni; 137 struct mbuf *mcopy; 138 139 /* NB: could check for IFF_UP but this is cheaper */ 140 if (vap->iv_state == IEEE80211_S_INIT) 141 continue; 142 /* 143 * WDS vap's only receive directed traffic from the 144 * station at the ``far end''. That traffic should 145 * be passed through the AP vap the station is associated 146 * to--so don't spam them with mcast frames. 147 */ 148 if (vap->iv_opmode == IEEE80211_M_WDS) 149 continue; 150 if (TAILQ_NEXT(vap, iv_next) != NULL) { 151 /* 152 * Packet contents are changed by ieee80211_decap 153 * so do a deep copy of the packet. 154 */ 155 mcopy = m_dup(m, M_NOWAIT); 156 if (mcopy == NULL) { 157 /* XXX stat+msg */ 158 continue; 159 } 160 } else { 161 mcopy = m; 162 m = NULL; 163 } 164 ni = ieee80211_ref_node(vap->iv_bss); 165 type = ieee80211_input_mimo(ni, mcopy, &rxs); 166 ieee80211_free_node(ni); 167 } 168 if (m != NULL) /* no vaps, reclaim mbuf */ 169 m_freem(m); 170 return type; 171 } 172 173 /* 174 * This function reassembles fragments. 175 * 176 * XXX should handle 3 concurrent reassemblies per-spec. 177 */ 178 struct mbuf * 179 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace) 180 { 181 struct ieee80211vap *vap = ni->ni_vap; 182 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 183 struct ieee80211_frame *lwh; 184 uint16_t rxseq; 185 uint8_t fragno; 186 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 187 struct mbuf *mfrag; 188 189 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); 190 191 rxseq = le16toh(*(uint16_t *)wh->i_seq); 192 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 193 194 /* Quick way out, if there's nothing to defragment */ 195 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) 196 return m; 197 198 /* 199 * Remove frag to insure it doesn't get reaped by timer. 200 */ 201 if (ni->ni_table == NULL) { 202 /* 203 * Should never happen. If the node is orphaned (not in 204 * the table) then input packets should not reach here. 205 * Otherwise, a concurrent request that yanks the table 206 * should be blocked by other interlocking and/or by first 207 * shutting the driver down. Regardless, be defensive 208 * here and just bail 209 */ 210 /* XXX need msg+stat */ 211 m_freem(m); 212 return NULL; 213 } 214 IEEE80211_NODE_LOCK(ni->ni_table); 215 mfrag = ni->ni_rxfrag[0]; 216 ni->ni_rxfrag[0] = NULL; 217 IEEE80211_NODE_UNLOCK(ni->ni_table); 218 219 /* 220 * Validate new fragment is in order and 221 * related to the previous ones. 222 */ 223 if (mfrag != NULL) { 224 uint16_t last_rxseq; 225 226 lwh = mtod(mfrag, struct ieee80211_frame *); 227 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); 228 /* NB: check seq # and frag together */ 229 if (rxseq != last_rxseq+1 || 230 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || 231 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 232 /* 233 * Unrelated fragment or no space for it, 234 * clear current fragments. 235 */ 236 m_freem(mfrag); 237 mfrag = NULL; 238 } 239 } 240 241 if (mfrag == NULL) { 242 if (fragno != 0) { /* !first fragment, discard */ 243 vap->iv_stats.is_rx_defrag++; 244 IEEE80211_NODE_STAT(ni, rx_defrag); 245 m_freem(m); 246 return NULL; 247 } 248 mfrag = m; 249 } else { /* concatenate */ 250 m_adj(m, hdrspace); /* strip header */ 251 #if defined(__DragonFly__) 252 m_cat(mfrag, m); 253 /* NB: m_cat doesn't update the packet header */ 254 mfrag->m_pkthdr.len += m->m_pkthdr.len; 255 #else 256 m_catpkt(mfrag, m); 257 #endif 258 /* track last seqnum and fragno */ 259 lwh = mtod(mfrag, struct ieee80211_frame *); 260 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; 261 } 262 if (more_frag) { /* more to come, save */ 263 ni->ni_rxfragstamp = ticks; 264 ni->ni_rxfrag[0] = mfrag; 265 mfrag = NULL; 266 } 267 return mfrag; 268 } 269 270 void 271 ieee80211_deliver_data(struct ieee80211vap *vap, 272 struct ieee80211_node *ni, struct mbuf *m) 273 { 274 struct ether_header *eh = mtod(m, struct ether_header *); 275 struct ifnet *ifp = vap->iv_ifp; 276 277 /* clear driver/net80211 flags before passing up */ 278 m->m_flags &= ~(M_MCAST | M_BCAST); 279 #if defined(__DragonFly__) 280 #else 281 m_clrprotoflags(m); 282 #endif 283 284 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 285 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 286 /* 287 * Do accounting. 288 */ 289 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 290 IEEE80211_NODE_STAT(ni, rx_data); 291 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 292 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 293 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 294 IEEE80211_NODE_STAT(ni, rx_mcast); 295 } else 296 IEEE80211_NODE_STAT(ni, rx_ucast); 297 m->m_pkthdr.rcvif = ifp; 298 299 if (ni->ni_vlan != 0) { 300 /* attach vlan tag */ 301 #if defined(__DragonFly__) 302 m->m_pkthdr.ether_vlantag = ni->ni_vlan; 303 #else 304 m->m_pkthdr.ether_vtag = ni->ni_vlan; 305 #endif 306 m->m_flags |= M_VLANTAG; 307 } 308 #if defined(__DragonFly__) 309 ifp->if_input(ifp, m, NULL, -1); 310 #else 311 ifp->if_input(ifp, m); 312 #endif 313 } 314 315 struct mbuf * 316 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 317 { 318 struct ieee80211_qosframe_addr4 wh; 319 struct ether_header *eh; 320 struct llc *llc; 321 322 KASSERT(hdrlen <= sizeof(wh), 323 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 324 325 if (m->m_len < hdrlen + sizeof(*llc) && 326 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 327 vap->iv_stats.is_rx_tooshort++; 328 /* XXX msg */ 329 return NULL; 330 } 331 memcpy(&wh, mtod(m, caddr_t), hdrlen); 332 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 333 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 334 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 335 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 336 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 337 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 338 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 339 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 340 llc = NULL; 341 } else { 342 m_adj(m, hdrlen - sizeof(*eh)); 343 } 344 eh = mtod(m, struct ether_header *); 345 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 346 case IEEE80211_FC1_DIR_NODS: 347 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 348 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 349 break; 350 case IEEE80211_FC1_DIR_TODS: 351 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 352 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 353 break; 354 case IEEE80211_FC1_DIR_FROMDS: 355 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 356 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 357 break; 358 case IEEE80211_FC1_DIR_DSTODS: 359 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 360 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 361 break; 362 } 363 #ifndef __NO_STRICT_ALIGNMENT 364 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 365 m = ieee80211_realign(vap, m, sizeof(*eh)); 366 if (m == NULL) 367 return NULL; 368 } 369 #endif /* !__NO_STRICT_ALIGNMENT */ 370 if (llc != NULL) { 371 eh = mtod(m, struct ether_header *); 372 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 373 } 374 return m; 375 } 376 377 /* 378 * Decap a frame encapsulated in a fast-frame/A-MSDU. 379 */ 380 struct mbuf * 381 ieee80211_decap1(struct mbuf *m, int *framelen) 382 { 383 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 384 struct ether_header *eh; 385 struct llc *llc; 386 387 /* 388 * The frame has an 802.3 header followed by an 802.2 389 * LLC header. The encapsulated frame length is in the 390 * first header type field; save that and overwrite it 391 * with the true type field found in the second. Then 392 * copy the 802.3 header up to where it belongs and 393 * adjust the mbuf contents to remove the void. 394 */ 395 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 396 return NULL; 397 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 398 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 399 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 400 + sizeof(struct ether_header) - sizeof(struct llc); 401 eh->ether_type = llc->llc_un.type_snap.ether_type; 402 bcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 403 sizeof(struct ether_header)); 404 m_adj(m, sizeof(struct llc)); 405 return m; 406 #undef FF_LLC_SIZE 407 } 408 409 /* 410 * Install received rate set information in the node's state block. 411 */ 412 int 413 ieee80211_setup_rates(struct ieee80211_node *ni, 414 const uint8_t *rates, const uint8_t *xrates, int flags) 415 { 416 struct ieee80211vap *vap = ni->ni_vap; 417 struct ieee80211_rateset *rs = &ni->ni_rates; 418 419 memset(rs, 0, sizeof(*rs)); 420 rs->rs_nrates = rates[1]; 421 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 422 if (xrates != NULL) { 423 uint8_t nxrates; 424 /* 425 * Tack on 11g extended supported rate element. 426 */ 427 nxrates = xrates[1]; 428 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 429 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 430 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 431 "extended rate set too large; only using " 432 "%u of %u rates", nxrates, xrates[1]); 433 vap->iv_stats.is_rx_rstoobig++; 434 } 435 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 436 rs->rs_nrates += nxrates; 437 } 438 return ieee80211_fix_rate(ni, rs, flags); 439 } 440 441 /* 442 * Send a management frame error response to the specified 443 * station. If ni is associated with the station then use 444 * it; otherwise allocate a temporary node suitable for 445 * transmitting the frame and then free the reference so 446 * it will go away as soon as the frame has been transmitted. 447 */ 448 void 449 ieee80211_send_error(struct ieee80211_node *ni, 450 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 451 { 452 struct ieee80211vap *vap = ni->ni_vap; 453 int istmp; 454 455 if (ni == vap->iv_bss) { 456 if (vap->iv_state != IEEE80211_S_RUN) { 457 /* 458 * XXX hack until we get rid of this routine. 459 * We can be called prior to the vap reaching 460 * run state under certain conditions in which 461 * case iv_bss->ni_chan will not be setup. 462 * Check for this explicitly and and just ignore 463 * the request. 464 */ 465 return; 466 } 467 ni = ieee80211_tmp_node(vap, mac); 468 if (ni == NULL) { 469 /* XXX msg */ 470 return; 471 } 472 istmp = 1; 473 } else 474 istmp = 0; 475 IEEE80211_SEND_MGMT(ni, subtype, arg); 476 if (istmp) 477 ieee80211_free_node(ni); 478 } 479 480 int 481 ieee80211_alloc_challenge(struct ieee80211_node *ni) 482 { 483 if (ni->ni_challenge == NULL) 484 #if defined(__DragonFly__) 485 ni->ni_challenge = (uint32_t *) kmalloc(IEEE80211_CHALLENGE_LEN, 486 M_80211_NODE, M_INTWAIT); 487 #else 488 ni->ni_challenge = (uint32_t *) 489 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN, 490 M_80211_NODE, IEEE80211_M_NOWAIT); 491 #endif 492 if (ni->ni_challenge == NULL) { 493 IEEE80211_NOTE(ni->ni_vap, 494 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 495 "%s", "shared key challenge alloc failed"); 496 /* XXX statistic */ 497 } 498 return (ni->ni_challenge != NULL); 499 } 500 501 /* 502 * Parse a Beacon or ProbeResponse frame and return the 503 * useful information in an ieee80211_scanparams structure. 504 * Status is set to 0 if no problems were found; otherwise 505 * a bitmask of IEEE80211_BPARSE_* items is returned that 506 * describes the problems detected. 507 */ 508 int 509 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 510 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan) 511 { 512 struct ieee80211vap *vap = ni->ni_vap; 513 struct ieee80211com *ic = ni->ni_ic; 514 struct ieee80211_frame *wh; 515 uint8_t *frm, *efrm; 516 517 wh = mtod(m, struct ieee80211_frame *); 518 frm = (uint8_t *)&wh[1]; 519 efrm = mtod(m, uint8_t *) + m->m_len; 520 scan->status = 0; 521 /* 522 * beacon/probe response frame format 523 * [8] time stamp 524 * [2] beacon interval 525 * [2] capability information 526 * [tlv] ssid 527 * [tlv] supported rates 528 * [tlv] country information 529 * [tlv] channel switch announcement (CSA) 530 * [tlv] parameter set (FH/DS) 531 * [tlv] erp information 532 * [tlv] extended supported rates 533 * [tlv] WME 534 * [tlv] WPA or RSN 535 * [tlv] HT capabilities 536 * [tlv] HT information 537 * [tlv] Atheros capabilities 538 * [tlv] Mesh ID 539 * [tlv] Mesh Configuration 540 */ 541 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 542 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 543 memset(scan, 0, sizeof(*scan)); 544 scan->tstamp = frm; frm += 8; 545 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 546 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 547 scan->bchan = ieee80211_chan2ieee(ic, rxchan); 548 scan->chan = scan->bchan; 549 scan->ies = frm; 550 scan->ies_len = efrm - frm; 551 552 while (efrm - frm > 1) { 553 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 554 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 555 switch (*frm) { 556 case IEEE80211_ELEMID_SSID: 557 scan->ssid = frm; 558 break; 559 case IEEE80211_ELEMID_RATES: 560 scan->rates = frm; 561 break; 562 case IEEE80211_ELEMID_COUNTRY: 563 scan->country = frm; 564 break; 565 case IEEE80211_ELEMID_CSA: 566 scan->csa = frm; 567 break; 568 case IEEE80211_ELEMID_QUIET: 569 scan->quiet = frm; 570 break; 571 case IEEE80211_ELEMID_FHPARMS: 572 if (ic->ic_phytype == IEEE80211_T_FH) { 573 scan->fhdwell = le16dec(&frm[2]); 574 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 575 scan->fhindex = frm[6]; 576 } 577 break; 578 case IEEE80211_ELEMID_DSPARMS: 579 /* 580 * XXX hack this since depending on phytype 581 * is problematic for multi-mode devices. 582 */ 583 if (ic->ic_phytype != IEEE80211_T_FH) 584 scan->chan = frm[2]; 585 break; 586 case IEEE80211_ELEMID_TIM: 587 /* XXX ATIM? */ 588 scan->tim = frm; 589 scan->timoff = frm - mtod(m, uint8_t *); 590 break; 591 case IEEE80211_ELEMID_IBSSPARMS: 592 case IEEE80211_ELEMID_CFPARMS: 593 case IEEE80211_ELEMID_PWRCNSTR: 594 case IEEE80211_ELEMID_BSSLOAD: 595 case IEEE80211_ELEMID_APCHANREP: 596 /* NB: avoid debugging complaints */ 597 break; 598 case IEEE80211_ELEMID_XRATES: 599 scan->xrates = frm; 600 break; 601 case IEEE80211_ELEMID_ERP: 602 if (frm[1] != 1) { 603 IEEE80211_DISCARD_IE(vap, 604 IEEE80211_MSG_ELEMID, wh, "ERP", 605 "bad len %u", frm[1]); 606 vap->iv_stats.is_rx_elem_toobig++; 607 break; 608 } 609 scan->erp = frm[2] | 0x100; 610 break; 611 case IEEE80211_ELEMID_HTCAP: 612 scan->htcap = frm; 613 break; 614 case IEEE80211_ELEMID_RSN: 615 scan->rsn = frm; 616 break; 617 case IEEE80211_ELEMID_HTINFO: 618 scan->htinfo = frm; 619 break; 620 #ifdef IEEE80211_SUPPORT_MESH 621 case IEEE80211_ELEMID_MESHID: 622 scan->meshid = frm; 623 break; 624 case IEEE80211_ELEMID_MESHCONF: 625 scan->meshconf = frm; 626 break; 627 #endif 628 /* Extended capabilities; nothing handles it for now */ 629 case IEEE80211_ELEMID_EXTCAP: 630 break; 631 case IEEE80211_ELEMID_VENDOR: 632 if (iswpaoui(frm)) 633 scan->wpa = frm; 634 else if (iswmeparam(frm) || iswmeinfo(frm)) 635 scan->wme = frm; 636 #ifdef IEEE80211_SUPPORT_SUPERG 637 else if (isatherosoui(frm)) 638 scan->ath = frm; 639 #endif 640 #ifdef IEEE80211_SUPPORT_TDMA 641 else if (istdmaoui(frm)) 642 scan->tdma = frm; 643 #endif 644 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 645 /* 646 * Accept pre-draft HT ie's if the 647 * standard ones have not been seen. 648 */ 649 if (ishtcapoui(frm)) { 650 if (scan->htcap == NULL) 651 scan->htcap = frm; 652 } else if (ishtinfooui(frm)) { 653 if (scan->htinfo == NULL) 654 scan->htcap = frm; 655 } 656 } 657 break; 658 default: 659 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 660 wh, "unhandled", 661 "id %u, len %u", *frm, frm[1]); 662 vap->iv_stats.is_rx_elem_unknown++; 663 break; 664 } 665 frm += frm[1] + 2; 666 } 667 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 668 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 669 if (scan->rates != NULL && scan->xrates != NULL) { 670 /* 671 * NB: don't process XRATES if RATES is missing. This 672 * avoids a potential null ptr deref and should be ok 673 * as the return code will already note RATES is missing 674 * (so callers shouldn't otherwise process the frame). 675 */ 676 IEEE80211_VERIFY_ELEMENT(scan->xrates, 677 IEEE80211_RATE_MAXSIZE - scan->rates[1], 678 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 679 } 680 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 681 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 682 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 683 /* 684 * Frame was received on a channel different from the 685 * one indicated in the DS params element id; 686 * silently discard it. 687 * 688 * NB: this can happen due to signal leakage. 689 * But we should take it for FH phy because 690 * the rssi value should be correct even for 691 * different hop pattern in FH. 692 */ 693 IEEE80211_DISCARD(vap, 694 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 695 wh, NULL, "for off-channel %u (bchan=%u)", 696 scan->chan, scan->bchan); 697 vap->iv_stats.is_rx_chanmismatch++; 698 scan->status |= IEEE80211_BPARSE_OFFCHAN; 699 } 700 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 701 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 702 IEEE80211_DISCARD(vap, 703 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 704 wh, NULL, "bogus beacon interval (%d TU)", 705 (int) scan->bintval); 706 vap->iv_stats.is_rx_badbintval++; 707 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 708 } 709 if (scan->country != NULL) { 710 /* 711 * Validate we have at least enough data to extract 712 * the country code. Not sure if we should return an 713 * error instead of discarding the IE; consider this 714 * being lenient as we don't depend on the data for 715 * correct operation. 716 */ 717 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 718 scan->country = NULL); 719 } 720 if (scan->csa != NULL) { 721 /* 722 * Validate Channel Switch Announcement; this must 723 * be the correct length or we toss the frame. 724 */ 725 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 726 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 727 } 728 /* 729 * Process HT ie's. This is complicated by our 730 * accepting both the standard ie's and the pre-draft 731 * vendor OUI ie's that some vendors still use/require. 732 */ 733 if (scan->htcap != NULL) { 734 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 735 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 736 4 + sizeof(struct ieee80211_ie_htcap)-2 : 737 sizeof(struct ieee80211_ie_htcap)-2, 738 scan->htcap = NULL); 739 } 740 if (scan->htinfo != NULL) { 741 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 742 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 743 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 744 sizeof(struct ieee80211_ie_htinfo)-2, 745 scan->htinfo = NULL); 746 } 747 return scan->status; 748 } 749 750 /* 751 * Parse an Action frame. Return 0 on success, non-zero on failure. 752 */ 753 int 754 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 755 { 756 struct ieee80211vap *vap = ni->ni_vap; 757 const struct ieee80211_action *ia; 758 struct ieee80211_frame *wh; 759 uint8_t *frm, *efrm; 760 761 /* 762 * action frame format: 763 * [1] category 764 * [1] action 765 * [tlv] parameters 766 */ 767 wh = mtod(m, struct ieee80211_frame *); 768 frm = (u_int8_t *)&wh[1]; 769 efrm = mtod(m, u_int8_t *) + m->m_len; 770 IEEE80211_VERIFY_LENGTH(efrm - frm, 771 sizeof(struct ieee80211_action), return EINVAL); 772 ia = (const struct ieee80211_action *) frm; 773 774 vap->iv_stats.is_rx_action++; 775 IEEE80211_NODE_STAT(ni, rx_action); 776 777 /* verify frame payloads but defer processing */ 778 switch (ia->ia_category) { 779 case IEEE80211_ACTION_CAT_BA: 780 switch (ia->ia_action) { 781 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 782 IEEE80211_VERIFY_LENGTH(efrm - frm, 783 sizeof(struct ieee80211_action_ba_addbarequest), 784 return EINVAL); 785 break; 786 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 787 IEEE80211_VERIFY_LENGTH(efrm - frm, 788 sizeof(struct ieee80211_action_ba_addbaresponse), 789 return EINVAL); 790 break; 791 case IEEE80211_ACTION_BA_DELBA: 792 IEEE80211_VERIFY_LENGTH(efrm - frm, 793 sizeof(struct ieee80211_action_ba_delba), 794 return EINVAL); 795 break; 796 } 797 break; 798 case IEEE80211_ACTION_CAT_HT: 799 switch (ia->ia_action) { 800 case IEEE80211_ACTION_HT_TXCHWIDTH: 801 IEEE80211_VERIFY_LENGTH(efrm - frm, 802 sizeof(struct ieee80211_action_ht_txchwidth), 803 return EINVAL); 804 break; 805 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 806 IEEE80211_VERIFY_LENGTH(efrm - frm, 807 sizeof(struct ieee80211_action_ht_mimopowersave), 808 return EINVAL); 809 break; 810 } 811 break; 812 #ifdef IEEE80211_SUPPORT_MESH 813 case IEEE80211_ACTION_CAT_MESH: 814 switch (ia->ia_action) { 815 case IEEE80211_ACTION_MESH_LMETRIC: 816 /* 817 * XXX: verification is true only if we are using 818 * Airtime link metric (default) 819 */ 820 IEEE80211_VERIFY_LENGTH(efrm - frm, 821 sizeof(struct ieee80211_meshlmetric_ie), 822 return EINVAL); 823 break; 824 case IEEE80211_ACTION_MESH_HWMP: 825 /* verify something */ 826 break; 827 case IEEE80211_ACTION_MESH_GANN: 828 IEEE80211_VERIFY_LENGTH(efrm - frm, 829 sizeof(struct ieee80211_meshgann_ie), 830 return EINVAL); 831 break; 832 case IEEE80211_ACTION_MESH_CC: 833 case IEEE80211_ACTION_MESH_MCCA_SREQ: 834 case IEEE80211_ACTION_MESH_MCCA_SREP: 835 case IEEE80211_ACTION_MESH_MCCA_AREQ: 836 case IEEE80211_ACTION_MESH_MCCA_ADVER: 837 case IEEE80211_ACTION_MESH_MCCA_TRDOWN: 838 case IEEE80211_ACTION_MESH_TBTT_REQ: 839 case IEEE80211_ACTION_MESH_TBTT_RES: 840 /* reject these early on, not implemented */ 841 IEEE80211_DISCARD(vap, 842 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 843 wh, NULL, "not implemented yet, act=0x%02X", 844 ia->ia_action); 845 return EINVAL; 846 } 847 break; 848 case IEEE80211_ACTION_CAT_SELF_PROT: 849 /* If TA or RA group address discard silently */ 850 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 851 IEEE80211_IS_MULTICAST(wh->i_addr2)) 852 return EINVAL; 853 /* 854 * XXX: Should we verify complete length now or it is 855 * to varying in sizes? 856 */ 857 switch (ia->ia_action) { 858 case IEEE80211_ACTION_MESHPEERING_CONFIRM: 859 case IEEE80211_ACTION_MESHPEERING_CLOSE: 860 /* is not a peering candidate (yet) */ 861 if (ni == vap->iv_bss) 862 return EINVAL; 863 break; 864 } 865 break; 866 #endif 867 } 868 return 0; 869 } 870 871 #ifdef IEEE80211_DEBUG 872 /* 873 * Debugging support. 874 */ 875 void 876 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 877 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 878 { 879 kprintf("[%s] discard %s frame, ssid mismatch: ", 880 ether_sprintf(mac), tag); 881 ieee80211_print_essid(ssid + 2, ssid[1]); 882 kprintf("\n"); 883 } 884 885 /* 886 * Return the bssid of a frame. 887 */ 888 static const uint8_t * 889 ieee80211_getbssid(const struct ieee80211vap *vap, 890 const struct ieee80211_frame *wh) 891 { 892 if (vap->iv_opmode == IEEE80211_M_STA) 893 return wh->i_addr2; 894 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 895 return wh->i_addr1; 896 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 897 return wh->i_addr1; 898 return wh->i_addr3; 899 } 900 901 #include <machine/stdarg.h> 902 903 void 904 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 905 { 906 char buf[128]; /* XXX */ 907 #if defined(__DragonFly__) 908 osdep_va_list ap; 909 910 osdep_va_start(ap, fmt); 911 kvsnprintf(buf, sizeof(buf), fmt, ap); 912 osdep_va_end(ap); 913 #else 914 va_list ap; 915 916 va_start(ap, fmt); 917 vsnprintf(buf, sizeof(buf), fmt, ap); 918 va_end(ap); 919 #endif 920 921 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 922 } 923 924 void 925 ieee80211_note_frame(const struct ieee80211vap *vap, 926 const struct ieee80211_frame *wh, 927 const char *fmt, ...) 928 { 929 char buf[128]; /* XXX */ 930 #if defined(__DragonFly__) 931 osdep_va_list ap; 932 933 osdep_va_start(ap, fmt); 934 kvsnprintf(buf, sizeof(buf), fmt, ap); 935 osdep_va_end(ap); 936 #else 937 va_list ap; 938 939 va_start(ap, fmt); 940 vsnprintf(buf, sizeof(buf), fmt, ap); 941 va_end(ap); 942 #endif 943 if_printf(vap->iv_ifp, "[%s] %s\n", 944 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 945 } 946 947 void 948 ieee80211_note_mac(const struct ieee80211vap *vap, 949 const uint8_t mac[IEEE80211_ADDR_LEN], 950 const char *fmt, ...) 951 { 952 char buf[128]; /* XXX */ 953 #if defined(__DragonFly__) 954 osdep_va_list ap; 955 956 osdep_va_start(ap, fmt); 957 kvsnprintf(buf, sizeof(buf), fmt, ap); 958 osdep_va_end(ap); 959 #else 960 va_list ap; 961 962 va_start(ap, fmt); 963 vsnprintf(buf, sizeof(buf), fmt, ap); 964 va_end(ap); 965 #endif 966 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 967 } 968 969 void 970 ieee80211_discard_frame(const struct ieee80211vap *vap, 971 const struct ieee80211_frame *wh, 972 const char *type, const char *fmt, ...) 973 { 974 #if defined(__DragonFly__) 975 osdep_va_list ap; 976 977 if_printf(vap->iv_ifp, "[%s] discard ", 978 ether_sprintf(ieee80211_getbssid(vap, wh))); 979 kprintf("%s frame, ", type != NULL ? type : 980 ieee80211_mgt_subtype_name(wh->i_fc[0])); 981 osdep_va_start(ap, fmt); 982 kvprintf(fmt, ap); 983 osdep_va_end(ap); 984 #else 985 va_list ap; 986 987 if_printf(vap->iv_ifp, "[%s] discard ", 988 ether_sprintf(ieee80211_getbssid(vap, wh))); 989 printf("%s frame, ", type != NULL ? type : 990 ieee80211_mgt_subtype_name(wh->i_fc[0])); 991 va_start(ap, fmt); 992 vprintf(fmt, ap); 993 va_end(ap); 994 #endif 995 kprintf("\n"); 996 } 997 998 void 999 ieee80211_discard_ie(const struct ieee80211vap *vap, 1000 const struct ieee80211_frame *wh, 1001 const char *type, const char *fmt, ...) 1002 { 1003 osdep_va_list ap; 1004 1005 #if defined(__DragonFly__) 1006 if_printf(vap->iv_ifp, "[%s] discard ", 1007 ether_sprintf(ieee80211_getbssid(vap, wh))); 1008 if (type != NULL) 1009 kprintf("%s information element, ", type); 1010 else 1011 kprintf("information element, "); 1012 osdep_va_start(ap, fmt); 1013 kvprintf(fmt, ap); 1014 osdep_va_end(ap); 1015 kprintf("\n"); 1016 #else 1017 if_printf(vap->iv_ifp, "[%s] discard ", 1018 ether_sprintf(ieee80211_getbssid(vap, wh))); 1019 if (type != NULL) 1020 printf("%s information element, ", type); 1021 else 1022 printf("information element, "); 1023 va_start(ap, fmt); 1024 vprintf(fmt, ap); 1025 va_end(ap); 1026 printf("\n"); 1027 #endif 1028 } 1029 1030 void 1031 ieee80211_discard_mac(const struct ieee80211vap *vap, 1032 const uint8_t mac[IEEE80211_ADDR_LEN], 1033 const char *type, const char *fmt, ...) 1034 { 1035 #if defined(__DragonFly__) 1036 osdep_va_list ap; 1037 1038 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 1039 if (type != NULL) 1040 kprintf("%s frame, ", type); 1041 else 1042 kprintf("frame, "); 1043 osdep_va_start(ap, fmt); 1044 kvprintf(fmt, ap); 1045 osdep_va_end(ap); 1046 #else 1047 va_list ap; 1048 1049 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 1050 if (type != NULL) 1051 printf("%s frame, ", type); 1052 else 1053 printf("frame, "); 1054 va_start(ap, fmt); 1055 vprintf(fmt, ap); 1056 va_end(ap); 1057 #endif 1058 kprintf("\n"); 1059 } 1060 #endif /* IEEE80211_DEBUG */ 1061