ieee80211_input.c revision 220445
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: head/sys/net80211/ieee80211_input.c 220445 2011-04-08 09:20:45Z adrian $"); 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 60static void 61ieee80211_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 84int 85ieee80211_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 93int 94ieee80211_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 104int 105ieee80211_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_DONTWAIT); 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 */ 157struct mbuf * 158ieee80211_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 245void 246ieee80211_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_80211_RX | M_MCAST | M_BCAST); 254 255 /* NB: see hostap_deliver_data, this path doesn't handle hostap */ 256 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap")); 257 /* 258 * Do accounting. 259 */ 260 ifp->if_ipackets++; 261 IEEE80211_NODE_STAT(ni, rx_data); 262 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 263 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 264 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 265 IEEE80211_NODE_STAT(ni, rx_mcast); 266 } else 267 IEEE80211_NODE_STAT(ni, rx_ucast); 268 m->m_pkthdr.rcvif = ifp; 269 270 if (ni->ni_vlan != 0) { 271 /* attach vlan tag */ 272 m->m_pkthdr.ether_vtag = ni->ni_vlan; 273 m->m_flags |= M_VLANTAG; 274 } 275 ifp->if_input(ifp, m); 276} 277 278struct mbuf * 279ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen) 280{ 281 struct ieee80211_qosframe_addr4 wh; 282 struct ether_header *eh; 283 struct llc *llc; 284 285 KASSERT(hdrlen <= sizeof(wh), 286 ("hdrlen %d > max %zd", hdrlen, sizeof(wh))); 287 288 if (m->m_len < hdrlen + sizeof(*llc) && 289 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { 290 vap->iv_stats.is_rx_tooshort++; 291 /* XXX msg */ 292 return NULL; 293 } 294 memcpy(&wh, mtod(m, caddr_t), hdrlen); 295 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 296 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && 297 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && 298 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 && 299 /* NB: preserve AppleTalk frames that have a native SNAP hdr */ 300 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) || 301 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) { 302 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); 303 llc = NULL; 304 } else { 305 m_adj(m, hdrlen - sizeof(*eh)); 306 } 307 eh = mtod(m, struct ether_header *); 308 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { 309 case IEEE80211_FC1_DIR_NODS: 310 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 311 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 312 break; 313 case IEEE80211_FC1_DIR_TODS: 314 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 315 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); 316 break; 317 case IEEE80211_FC1_DIR_FROMDS: 318 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); 319 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); 320 break; 321 case IEEE80211_FC1_DIR_DSTODS: 322 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); 323 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); 324 break; 325 } 326#ifdef ALIGNED_POINTER 327 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) { 328 m = ieee80211_realign(vap, m, sizeof(*eh)); 329 if (m == NULL) 330 return NULL; 331 } 332#endif /* ALIGNED_POINTER */ 333 if (llc != NULL) { 334 eh = mtod(m, struct ether_header *); 335 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); 336 } 337 return m; 338} 339 340/* 341 * Decap a frame encapsulated in a fast-frame/A-MSDU. 342 */ 343struct mbuf * 344ieee80211_decap1(struct mbuf *m, int *framelen) 345{ 346#define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 347 struct ether_header *eh; 348 struct llc *llc; 349 350 /* 351 * The frame has an 802.3 header followed by an 802.2 352 * LLC header. The encapsulated frame length is in the 353 * first header type field; save that and overwrite it 354 * with the true type field found in the second. Then 355 * copy the 802.3 header up to where it belongs and 356 * adjust the mbuf contents to remove the void. 357 */ 358 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) 359 return NULL; 360 eh = mtod(m, struct ether_header *); /* 802.3 header is first */ 361 llc = (struct llc *)&eh[1]; /* 802.2 header follows */ 362 *framelen = ntohs(eh->ether_type) /* encap'd frame size */ 363 + sizeof(struct ether_header) - sizeof(struct llc); 364 eh->ether_type = llc->llc_un.type_snap.ether_type; 365 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), 366 sizeof(struct ether_header)); 367 m_adj(m, sizeof(struct llc)); 368 return m; 369#undef FF_LLC_SIZE 370} 371 372/* 373 * Install received rate set information in the node's state block. 374 */ 375int 376ieee80211_setup_rates(struct ieee80211_node *ni, 377 const uint8_t *rates, const uint8_t *xrates, int flags) 378{ 379 struct ieee80211vap *vap = ni->ni_vap; 380 struct ieee80211_rateset *rs = &ni->ni_rates; 381 382 memset(rs, 0, sizeof(*rs)); 383 rs->rs_nrates = rates[1]; 384 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 385 if (xrates != NULL) { 386 uint8_t nxrates; 387 /* 388 * Tack on 11g extended supported rate element. 389 */ 390 nxrates = xrates[1]; 391 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 392 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 393 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni, 394 "extended rate set too large; only using " 395 "%u of %u rates", nxrates, xrates[1]); 396 vap->iv_stats.is_rx_rstoobig++; 397 } 398 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 399 rs->rs_nrates += nxrates; 400 } 401 return ieee80211_fix_rate(ni, rs, flags); 402} 403 404/* 405 * Send a management frame error response to the specified 406 * station. If ni is associated with the station then use 407 * it; otherwise allocate a temporary node suitable for 408 * transmitting the frame and then free the reference so 409 * it will go away as soon as the frame has been transmitted. 410 */ 411void 412ieee80211_send_error(struct ieee80211_node *ni, 413 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg) 414{ 415 struct ieee80211vap *vap = ni->ni_vap; 416 int istmp; 417 418 if (ni == vap->iv_bss) { 419 if (vap->iv_state != IEEE80211_S_RUN) { 420 /* 421 * XXX hack until we get rid of this routine. 422 * We can be called prior to the vap reaching 423 * run state under certain conditions in which 424 * case iv_bss->ni_chan will not be setup. 425 * Check for this explicitly and and just ignore 426 * the request. 427 */ 428 return; 429 } 430 ni = ieee80211_tmp_node(vap, mac); 431 if (ni == NULL) { 432 /* XXX msg */ 433 return; 434 } 435 istmp = 1; 436 } else 437 istmp = 0; 438 IEEE80211_SEND_MGMT(ni, subtype, arg); 439 if (istmp) 440 ieee80211_free_node(ni); 441} 442 443int 444ieee80211_alloc_challenge(struct ieee80211_node *ni) 445{ 446 if (ni->ni_challenge == NULL) 447 ni->ni_challenge = (uint32_t *) malloc(IEEE80211_CHALLENGE_LEN, 448 M_80211_NODE, M_NOWAIT); 449 if (ni->ni_challenge == NULL) { 450 IEEE80211_NOTE(ni->ni_vap, 451 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni, 452 "%s", "shared key challenge alloc failed"); 453 /* XXX statistic */ 454 } 455 return (ni->ni_challenge != NULL); 456} 457 458/* 459 * Parse a Beacon or ProbeResponse frame and return the 460 * useful information in an ieee80211_scanparams structure. 461 * Status is set to 0 if no problems were found; otherwise 462 * a bitmask of IEEE80211_BPARSE_* items is returned that 463 * describes the problems detected. 464 */ 465int 466ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m, 467 struct ieee80211_scanparams *scan) 468{ 469 struct ieee80211vap *vap = ni->ni_vap; 470 struct ieee80211com *ic = ni->ni_ic; 471 struct ieee80211_frame *wh; 472 uint8_t *frm, *efrm; 473 474 wh = mtod(m, struct ieee80211_frame *); 475 frm = (uint8_t *)&wh[1]; 476 efrm = mtod(m, uint8_t *) + m->m_len; 477 scan->status = 0; 478 /* 479 * beacon/probe response frame format 480 * [8] time stamp 481 * [2] beacon interval 482 * [2] capability information 483 * [tlv] ssid 484 * [tlv] supported rates 485 * [tlv] country information 486 * [tlv] channel switch announcement (CSA) 487 * [tlv] parameter set (FH/DS) 488 * [tlv] erp information 489 * [tlv] extended supported rates 490 * [tlv] WME 491 * [tlv] WPA or RSN 492 * [tlv] HT capabilities 493 * [tlv] HT information 494 * [tlv] Atheros capabilities 495 * [tlv] Mesh ID 496 * [tlv] Mesh Configuration 497 */ 498 IEEE80211_VERIFY_LENGTH(efrm - frm, 12, 499 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 500 memset(scan, 0, sizeof(*scan)); 501 scan->tstamp = frm; frm += 8; 502 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2; 503 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2; 504 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 505 scan->chan = scan->bchan; 506 scan->ies = frm; 507 scan->ies_len = efrm - frm; 508 509 while (efrm - frm > 1) { 510 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, 511 return (scan->status = IEEE80211_BPARSE_BADIELEN)); 512 switch (*frm) { 513 case IEEE80211_ELEMID_SSID: 514 scan->ssid = frm; 515 break; 516 case IEEE80211_ELEMID_RATES: 517 scan->rates = frm; 518 break; 519 case IEEE80211_ELEMID_COUNTRY: 520 scan->country = frm; 521 break; 522 case IEEE80211_ELEMID_CSA: 523 scan->csa = frm; 524 break; 525 case IEEE80211_ELEMID_FHPARMS: 526 if (ic->ic_phytype == IEEE80211_T_FH) { 527 scan->fhdwell = LE_READ_2(&frm[2]); 528 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 529 scan->fhindex = frm[6]; 530 } 531 break; 532 case IEEE80211_ELEMID_DSPARMS: 533 /* 534 * XXX hack this since depending on phytype 535 * is problematic for multi-mode devices. 536 */ 537 if (ic->ic_phytype != IEEE80211_T_FH) 538 scan->chan = frm[2]; 539 break; 540 case IEEE80211_ELEMID_TIM: 541 /* XXX ATIM? */ 542 scan->tim = frm; 543 scan->timoff = frm - mtod(m, uint8_t *); 544 break; 545 case IEEE80211_ELEMID_IBSSPARMS: 546 case IEEE80211_ELEMID_CFPARMS: 547 case IEEE80211_ELEMID_PWRCNSTR: 548 /* NB: avoid debugging complaints */ 549 break; 550 case IEEE80211_ELEMID_XRATES: 551 scan->xrates = frm; 552 break; 553 case IEEE80211_ELEMID_ERP: 554 if (frm[1] != 1) { 555 IEEE80211_DISCARD_IE(vap, 556 IEEE80211_MSG_ELEMID, wh, "ERP", 557 "bad len %u", frm[1]); 558 vap->iv_stats.is_rx_elem_toobig++; 559 break; 560 } 561 scan->erp = frm[2] | 0x100; 562 break; 563 case IEEE80211_ELEMID_HTCAP: 564 scan->htcap = frm; 565 break; 566 case IEEE80211_ELEMID_RSN: 567 scan->rsn = frm; 568 break; 569 case IEEE80211_ELEMID_HTINFO: 570 scan->htinfo = frm; 571 break; 572#ifdef IEEE80211_SUPPORT_MESH 573 case IEEE80211_ELEMID_MESHID: 574 scan->meshid = frm; 575 break; 576 case IEEE80211_ELEMID_MESHCONF: 577 scan->meshconf = frm; 578 break; 579#endif 580 case IEEE80211_ELEMID_VENDOR: 581 if (iswpaoui(frm)) 582 scan->wpa = frm; 583 else if (iswmeparam(frm) || iswmeinfo(frm)) 584 scan->wme = frm; 585#ifdef IEEE80211_SUPPORT_SUPERG 586 else if (isatherosoui(frm)) 587 scan->ath = frm; 588#endif 589#ifdef IEEE80211_SUPPORT_TDMA 590 else if (istdmaoui(frm)) 591 scan->tdma = frm; 592#endif 593 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 594 /* 595 * Accept pre-draft HT ie's if the 596 * standard ones have not been seen. 597 */ 598 if (ishtcapoui(frm)) { 599 if (scan->htcap == NULL) 600 scan->htcap = frm; 601 } else if (ishtinfooui(frm)) { 602 if (scan->htinfo == NULL) 603 scan->htcap = frm; 604 } 605 } 606 break; 607 default: 608 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID, 609 wh, "unhandled", 610 "id %u, len %u", *frm, frm[1]); 611 vap->iv_stats.is_rx_elem_unknown++; 612 break; 613 } 614 frm += frm[1] + 2; 615 } 616 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE, 617 scan->status |= IEEE80211_BPARSE_RATES_INVALID); 618 if (scan->rates != NULL && scan->xrates != NULL) { 619 /* 620 * NB: don't process XRATES if RATES is missing. This 621 * avoids a potential null ptr deref and should be ok 622 * as the return code will already note RATES is missing 623 * (so callers shouldn't otherwise process the frame). 624 */ 625 IEEE80211_VERIFY_ELEMENT(scan->xrates, 626 IEEE80211_RATE_MAXSIZE - scan->rates[1], 627 scan->status |= IEEE80211_BPARSE_XRATES_INVALID); 628 } 629 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN, 630 scan->status |= IEEE80211_BPARSE_SSID_INVALID); 631 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) { 632 /* 633 * Frame was received on a channel different from the 634 * one indicated in the DS params element id; 635 * silently discard it. 636 * 637 * NB: this can happen due to signal leakage. 638 * But we should take it for FH phy because 639 * the rssi value should be correct even for 640 * different hop pattern in FH. 641 */ 642 IEEE80211_DISCARD(vap, 643 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 644 wh, NULL, "for off-channel %u", scan->chan); 645 vap->iv_stats.is_rx_chanmismatch++; 646 scan->status |= IEEE80211_BPARSE_OFFCHAN; 647 } 648 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval && 649 scan->bintval <= IEEE80211_BINTVAL_MAX)) { 650 IEEE80211_DISCARD(vap, 651 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 652 wh, NULL, "bogus beacon interval", scan->bintval); 653 vap->iv_stats.is_rx_badbintval++; 654 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID; 655 } 656 if (scan->country != NULL) { 657 /* 658 * Validate we have at least enough data to extract 659 * the country code. Not sure if we should return an 660 * error instead of discarding the IE; consider this 661 * being lenient as we don't depend on the data for 662 * correct operation. 663 */ 664 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t), 665 scan->country = NULL); 666 } 667 if (scan->csa != NULL) { 668 /* 669 * Validate Channel Switch Announcement; this must 670 * be the correct length or we toss the frame. 671 */ 672 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t), 673 scan->status |= IEEE80211_BPARSE_CSA_INVALID); 674 } 675 /* 676 * Process HT ie's. This is complicated by our 677 * accepting both the standard ie's and the pre-draft 678 * vendor OUI ie's that some vendors still use/require. 679 */ 680 if (scan->htcap != NULL) { 681 IEEE80211_VERIFY_LENGTH(scan->htcap[1], 682 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ? 683 4 + sizeof(struct ieee80211_ie_htcap)-2 : 684 sizeof(struct ieee80211_ie_htcap)-2, 685 scan->htcap = NULL); 686 } 687 if (scan->htinfo != NULL) { 688 IEEE80211_VERIFY_LENGTH(scan->htinfo[1], 689 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ? 690 4 + sizeof(struct ieee80211_ie_htinfo)-2 : 691 sizeof(struct ieee80211_ie_htinfo)-2, 692 scan->htinfo = NULL); 693 } 694 return scan->status; 695} 696 697/* 698 * Parse an Action frame. Return 0 on success, non-zero on failure. 699 */ 700int 701ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m) 702{ 703 struct ieee80211vap *vap = ni->ni_vap; 704 const struct ieee80211_action *ia; 705 struct ieee80211_frame *wh; 706 uint8_t *frm, *efrm; 707 708 /* 709 * action frame format: 710 * [1] category 711 * [1] action 712 * [tlv] parameters 713 */ 714 wh = mtod(m, struct ieee80211_frame *); 715 frm = (u_int8_t *)&wh[1]; 716 efrm = mtod(m, u_int8_t *) + m->m_len; 717 IEEE80211_VERIFY_LENGTH(efrm - frm, 718 sizeof(struct ieee80211_action), return EINVAL); 719 ia = (const struct ieee80211_action *) frm; 720 721 vap->iv_stats.is_rx_action++; 722 IEEE80211_NODE_STAT(ni, rx_action); 723 724 /* verify frame payloads but defer processing */ 725 switch (ia->ia_category) { 726 case IEEE80211_ACTION_CAT_BA: 727 switch (ia->ia_action) { 728 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 729 IEEE80211_VERIFY_LENGTH(efrm - frm, 730 sizeof(struct ieee80211_action_ba_addbarequest), 731 return EINVAL); 732 break; 733 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 734 IEEE80211_VERIFY_LENGTH(efrm - frm, 735 sizeof(struct ieee80211_action_ba_addbaresponse), 736 return EINVAL); 737 break; 738 case IEEE80211_ACTION_BA_DELBA: 739 IEEE80211_VERIFY_LENGTH(efrm - frm, 740 sizeof(struct ieee80211_action_ba_delba), 741 return EINVAL); 742 break; 743 } 744 break; 745 case IEEE80211_ACTION_CAT_HT: 746 switch (ia->ia_action) { 747 case IEEE80211_ACTION_HT_TXCHWIDTH: 748 IEEE80211_VERIFY_LENGTH(efrm - frm, 749 sizeof(struct ieee80211_action_ht_txchwidth), 750 return EINVAL); 751 break; 752 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 753 IEEE80211_VERIFY_LENGTH(efrm - frm, 754 sizeof(struct ieee80211_action_ht_mimopowersave), 755 return EINVAL); 756 break; 757 } 758 break; 759 } 760 return 0; 761} 762 763#ifdef IEEE80211_DEBUG 764/* 765 * Debugging support. 766 */ 767void 768ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag, 769 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) 770{ 771 printf("[%s] discard %s frame, ssid mismatch: ", 772 ether_sprintf(mac), tag); 773 ieee80211_print_essid(ssid + 2, ssid[1]); 774 printf("\n"); 775} 776 777/* 778 * Return the bssid of a frame. 779 */ 780static const uint8_t * 781ieee80211_getbssid(const struct ieee80211vap *vap, 782 const struct ieee80211_frame *wh) 783{ 784 if (vap->iv_opmode == IEEE80211_M_STA) 785 return wh->i_addr2; 786 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) 787 return wh->i_addr1; 788 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 789 return wh->i_addr1; 790 return wh->i_addr3; 791} 792 793#include <machine/stdarg.h> 794 795void 796ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...) 797{ 798 char buf[128]; /* XXX */ 799 va_list ap; 800 801 va_start(ap, fmt); 802 vsnprintf(buf, sizeof(buf), fmt, ap); 803 va_end(ap); 804 805 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */ 806} 807 808void 809ieee80211_note_frame(const struct ieee80211vap *vap, 810 const struct ieee80211_frame *wh, 811 const char *fmt, ...) 812{ 813 char buf[128]; /* XXX */ 814 va_list ap; 815 816 va_start(ap, fmt); 817 vsnprintf(buf, sizeof(buf), fmt, ap); 818 va_end(ap); 819 if_printf(vap->iv_ifp, "[%s] %s\n", 820 ether_sprintf(ieee80211_getbssid(vap, wh)), buf); 821} 822 823void 824ieee80211_note_mac(const struct ieee80211vap *vap, 825 const uint8_t mac[IEEE80211_ADDR_LEN], 826 const char *fmt, ...) 827{ 828 char buf[128]; /* XXX */ 829 va_list ap; 830 831 va_start(ap, fmt); 832 vsnprintf(buf, sizeof(buf), fmt, ap); 833 va_end(ap); 834 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf); 835} 836 837void 838ieee80211_discard_frame(const struct ieee80211vap *vap, 839 const struct ieee80211_frame *wh, 840 const char *type, const char *fmt, ...) 841{ 842 va_list ap; 843 844 if_printf(vap->iv_ifp, "[%s] discard ", 845 ether_sprintf(ieee80211_getbssid(vap, wh))); 846 if (type == NULL) { 847 printf("%s frame, ", ieee80211_mgt_subtype_name[ 848 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> 849 IEEE80211_FC0_SUBTYPE_SHIFT]); 850 } else 851 printf("%s frame, ", type); 852 va_start(ap, fmt); 853 vprintf(fmt, ap); 854 va_end(ap); 855 printf("\n"); 856} 857 858void 859ieee80211_discard_ie(const struct ieee80211vap *vap, 860 const struct ieee80211_frame *wh, 861 const char *type, const char *fmt, ...) 862{ 863 va_list ap; 864 865 if_printf(vap->iv_ifp, "[%s] discard ", 866 ether_sprintf(ieee80211_getbssid(vap, wh))); 867 if (type != NULL) 868 printf("%s information element, ", type); 869 else 870 printf("information element, "); 871 va_start(ap, fmt); 872 vprintf(fmt, ap); 873 va_end(ap); 874 printf("\n"); 875} 876 877void 878ieee80211_discard_mac(const struct ieee80211vap *vap, 879 const uint8_t mac[IEEE80211_ADDR_LEN], 880 const char *type, const char *fmt, ...) 881{ 882 va_list ap; 883 884 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac)); 885 if (type != NULL) 886 printf("%s frame, ", type); 887 else 888 printf("frame, "); 889 va_start(ap, fmt); 890 vprintf(fmt, ap); 891 va_end(ap); 892 printf("\n"); 893} 894#endif /* IEEE80211_DEBUG */ 895