1 /*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 #ifdef __FreeBSD__ 28 __FBSDID("$FreeBSD$"); 29 #endif 30 31 /* 32 * IEEE 802.11 HOSTAP mode support. 33 */ 34 #include "opt_inet.h" 35 #include "opt_wlan.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mbuf.h> 40 #include <sys/malloc.h> 41 #include <sys/kernel.h> 42 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/endian.h> 46 #include <sys/errno.h> 47 #include <sys/proc.h> 48 #include <sys/sysctl.h> 49 50 #include <net/if.h> 51 #include <net/if_media.h> 52 #include <net/if_llc.h> 53 #include <net/ethernet.h> 54 55 #include <net/bpf.h> 56 57 #include <net80211/ieee80211_var.h> 58 #include <net80211/ieee80211_hostap.h> 59 #include <net80211/ieee80211_input.h> 60 #ifdef IEEE80211_SUPPORT_SUPERG 61 #include <net80211/ieee80211_superg.h> 62 #endif 63 #include <net80211/ieee80211_wds.h> 64 65 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 66 67 static void hostap_vattach(struct ieee80211vap *); 68 static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int); 69 static int hostap_input(struct ieee80211_node *ni, struct mbuf *m, 70 int rssi, int nf); 71 static void hostap_deliver_data(struct ieee80211vap *, 72 struct ieee80211_node *, struct mbuf *); 73 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 74 int subtype, int rssi, int nf); 75 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int); 76 77 void 78 ieee80211_hostap_attach(struct ieee80211com *ic) 79 { 80 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach; 81 } 82 83 void 84 ieee80211_hostap_detach(struct ieee80211com *ic) 85 { 86 } 87 88 static void 89 hostap_vdetach(struct ieee80211vap *vap) 90 { 91 } 92 93 static void 94 hostap_vattach(struct ieee80211vap *vap) 95 { 96 vap->iv_newstate = hostap_newstate; 97 vap->iv_input = hostap_input; 98 vap->iv_recv_mgmt = hostap_recv_mgmt; 99 vap->iv_recv_ctl = hostap_recv_ctl; 100 vap->iv_opdetach = hostap_vdetach; 101 vap->iv_deliver_data = hostap_deliver_data; 102 vap->iv_recv_pspoll = ieee80211_recv_pspoll; 103 } 104 105 static void 106 sta_disassoc(void *arg, struct ieee80211_node *ni) 107 { 108 struct ieee80211vap *vap = arg; 109 110 if (ni->ni_vap == vap && ni->ni_associd != 0) { 111 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC, 112 IEEE80211_REASON_ASSOC_LEAVE); 113 ieee80211_node_leave(ni); 114 } 115 } 116 117 static void 118 sta_csa(void *arg, struct ieee80211_node *ni) 119 { 120 struct ieee80211vap *vap = arg; 121 122 if (ni->ni_vap == vap && ni->ni_associd != 0) 123 if (ni->ni_inact > vap->iv_inact_init) { 124 ni->ni_inact = vap->iv_inact_init; 125 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni, 126 "%s: inact %u", __func__, ni->ni_inact); 127 } 128 } 129 130 static void 131 sta_drop(void *arg, struct ieee80211_node *ni) 132 { 133 struct ieee80211vap *vap = arg; 134 135 if (ni->ni_vap == vap && ni->ni_associd != 0) 136 ieee80211_node_leave(ni); 137 } 138 139 /* 140 * Does a channel change require associated stations to re-associate 141 * so protocol state is correct. This is used when doing CSA across 142 * bands or similar (e.g. HT -> legacy). 143 */ 144 static int 145 isbandchange(struct ieee80211com *ic) 146 { 147 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) & 148 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF | 149 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0; 150 } 151 152 /* 153 * IEEE80211_M_HOSTAP vap state machine handler. 154 */ 155 static int 156 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 157 { 158 struct ieee80211com *ic = vap->iv_ic; 159 enum ieee80211_state ostate; 160 161 IEEE80211_LOCK_ASSERT(ic); 162 163 ostate = vap->iv_state; 164 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 165 __func__, ieee80211_state_name[ostate], 166 ieee80211_state_name[nstate], arg); 167 vap->iv_state = nstate; /* state transition */ 168 if (ostate != IEEE80211_S_SCAN) 169 ieee80211_cancel_scan(vap); /* background scan */ 170 switch (nstate) { 171 case IEEE80211_S_INIT: 172 switch (ostate) { 173 case IEEE80211_S_SCAN: 174 ieee80211_cancel_scan(vap); 175 break; 176 case IEEE80211_S_CAC: 177 ieee80211_dfs_cac_stop(vap); 178 break; 179 case IEEE80211_S_RUN: 180 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 181 break; 182 default: 183 break; 184 } 185 if (ostate != IEEE80211_S_INIT) { 186 /* NB: optimize INIT -> INIT case */ 187 ieee80211_reset_bss(vap); 188 } 189 if (vap->iv_auth->ia_detach != NULL) 190 vap->iv_auth->ia_detach(vap); 191 break; 192 case IEEE80211_S_SCAN: 193 switch (ostate) { 194 case IEEE80211_S_CSA: 195 case IEEE80211_S_RUN: 196 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 197 /* 198 * Clear overlapping BSS state; the beacon frame 199 * will be reconstructed on transition to the RUN 200 * state and the timeout routines check if the flag 201 * is set before doing anything so this is sufficient. 202 */ 203 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR; 204 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR; 205 /* fall thru... */ 206 case IEEE80211_S_CAC: 207 /* 208 * NB: We may get here because of a manual channel 209 * change in which case we need to stop CAC 210 * XXX no need to stop if ostate RUN but it's ok 211 */ 212 ieee80211_dfs_cac_stop(vap); 213 /* fall thru... */ 214 case IEEE80211_S_INIT: 215 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 216 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 217 /* 218 * Already have a channel; bypass the 219 * scan and startup immediately. 220 * ieee80211_create_ibss will call back to 221 * move us to RUN state. 222 */ 223 ieee80211_create_ibss(vap, vap->iv_des_chan); 224 break; 225 } 226 /* 227 * Initiate a scan. We can come here as a result 228 * of an IEEE80211_IOC_SCAN_REQ too in which case 229 * the vap will be marked with IEEE80211_FEXT_SCANREQ 230 * and the scan request parameters will be present 231 * in iv_scanreq. Otherwise we do the default. 232 */ 233 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 234 ieee80211_check_scan(vap, 235 vap->iv_scanreq_flags, 236 vap->iv_scanreq_duration, 237 vap->iv_scanreq_mindwell, 238 vap->iv_scanreq_maxdwell, 239 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 240 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 241 } else 242 ieee80211_check_scan_current(vap); 243 break; 244 case IEEE80211_S_SCAN: 245 /* 246 * A state change requires a reset; scan. 247 */ 248 ieee80211_check_scan_current(vap); 249 break; 250 default: 251 break; 252 } 253 break; 254 case IEEE80211_S_CAC: 255 /* 256 * Start CAC on a DFS channel. We come here when starting 257 * a bss on a DFS channel (see ieee80211_create_ibss). 258 */ 259 ieee80211_dfs_cac_start(vap); 260 break; 261 case IEEE80211_S_RUN: 262 if (vap->iv_flags & IEEE80211_F_WPA) { 263 /* XXX validate prerequisites */ 264 } 265 switch (ostate) { 266 case IEEE80211_S_INIT: 267 /* 268 * Already have a channel; bypass the 269 * scan and startup immediately. 270 * Note that ieee80211_create_ibss will call 271 * back to do a RUN->RUN state change. 272 */ 273 ieee80211_create_ibss(vap, 274 ieee80211_ht_adjust_channel(ic, 275 ic->ic_curchan, vap->iv_flags_ht)); 276 /* NB: iv_bss is changed on return */ 277 break; 278 case IEEE80211_S_CAC: 279 /* 280 * NB: This is the normal state change when CAC 281 * expires and no radar was detected; no need to 282 * clear the CAC timer as it's already expired. 283 */ 284 /* fall thru... */ 285 case IEEE80211_S_CSA: 286 /* 287 * Shorten inactivity timer of associated stations 288 * to weed out sta's that don't follow a CSA. 289 */ 290 ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap); 291 /* 292 * Update bss node channel to reflect where 293 * we landed after CSA. 294 */ 295 ieee80211_node_set_chan(vap->iv_bss, 296 ieee80211_ht_adjust_channel(ic, ic->ic_curchan, 297 ieee80211_htchanflags(vap->iv_bss->ni_chan))); 298 /* XXX bypass debug msgs */ 299 break; 300 case IEEE80211_S_SCAN: 301 case IEEE80211_S_RUN: 302 #ifdef IEEE80211_DEBUG 303 if (ieee80211_msg_debug(vap)) { 304 struct ieee80211_node *ni = vap->iv_bss; 305 ieee80211_note(vap, 306 "synchronized with %s ssid ", 307 ether_sprintf(ni->ni_bssid)); 308 ieee80211_print_essid(ni->ni_essid, 309 ni->ni_esslen); 310 /* XXX MCS/HT */ 311 printf(" channel %d start %uMb\n", 312 ieee80211_chan2ieee(ic, ic->ic_curchan), 313 IEEE80211_RATE2MBS(ni->ni_txrate)); 314 } 315 #endif 316 break; 317 default: 318 break; 319 } 320 /* 321 * Start/stop the authenticator. We delay until here 322 * to allow configuration to happen out of order. 323 */ 324 if (vap->iv_auth->ia_attach != NULL) { 325 /* XXX check failure */ 326 vap->iv_auth->ia_attach(vap); 327 } else if (vap->iv_auth->ia_detach != NULL) { 328 vap->iv_auth->ia_detach(vap); 329 } 330 ieee80211_node_authorize(vap->iv_bss); 331 break; 332 case IEEE80211_S_CSA: 333 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) { 334 /* 335 * On a ``band change'' silently drop associated 336 * stations as they must re-associate before they 337 * can pass traffic (as otherwise protocol state 338 * such as capabilities and the negotiated rate 339 * set may/will be wrong). 340 */ 341 ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap); 342 } 343 break; 344 default: 345 break; 346 } 347 return 0; 348 } 349 350 static void 351 hostap_deliver_data(struct ieee80211vap *vap, 352 struct ieee80211_node *ni, struct mbuf *m) 353 { 354 struct ether_header *eh = mtod(m, struct ether_header *); 355 struct ifnet *ifp = vap->iv_ifp; 356 357 /* clear driver/net80211 flags before passing up */ 358 #if __FreeBSD_version >= 1000046 359 m->m_flags &= ~(M_MCAST | M_BCAST); 360 m_clrprotoflags(m); 361 #else 362 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST); 363 #endif 364 365 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 366 ("gack, opmode %d", vap->iv_opmode)); 367 /* 368 * Do accounting. 369 */ 370 ifp->if_ipackets++; 371 IEEE80211_NODE_STAT(ni, rx_data); 372 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 373 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 374 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 375 IEEE80211_NODE_STAT(ni, rx_mcast); 376 } else 377 IEEE80211_NODE_STAT(ni, rx_ucast); 378 379 /* perform as a bridge within the AP */ 380 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 381 struct mbuf *mcopy = NULL; 382 383 if (m->m_flags & M_MCAST) { 384 mcopy = m_dup(m, M_NOWAIT); 385 if (mcopy == NULL) 386 ifp->if_oerrors++; 387 else 388 mcopy->m_flags |= M_MCAST; 389 } else { 390 /* 391 * Check if the destination is associated with the 392 * same vap and authorized to receive traffic. 393 * Beware of traffic destined for the vap itself; 394 * sending it will not work; just let it be delivered 395 * normally. 396 */ 397 struct ieee80211_node *sta = ieee80211_find_vap_node( 398 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 399 if (sta != NULL) { 400 if (ieee80211_node_is_authorized(sta)) { 401 /* 402 * Beware of sending to ourself; this 403 * needs to happen via the normal 404 * input path. 405 */ 406 if (sta != vap->iv_bss) { 407 mcopy = m; 408 m = NULL; 409 } 410 } else { 411 vap->iv_stats.is_rx_unauth++; 412 IEEE80211_NODE_STAT(sta, rx_unauth); 413 } 414 ieee80211_free_node(sta); 415 } 416 } 417 if (mcopy != NULL) { 418 int len, err; 419 len = mcopy->m_pkthdr.len; 420 err = ieee80211_vap_xmitpkt(vap, mcopy); 421 if (err) { 422 /* NB: IFQ_HANDOFF reclaims mcopy */ 423 } else { 424 ifp->if_opackets++; 425 } 426 } 427 } 428 if (m != NULL) { 429 /* 430 * Mark frame as coming from vap's interface. 431 */ 432 m->m_pkthdr.rcvif = ifp; 433 if (m->m_flags & M_MCAST) { 434 /* 435 * Spam DWDS vap's w/ multicast traffic. 436 */ 437 /* XXX only if dwds in use? */ 438 ieee80211_dwds_mcast(vap, m); 439 } 440 if (ni->ni_vlan != 0) { 441 /* attach vlan tag */ 442 m->m_pkthdr.ether_vtag = ni->ni_vlan; 443 m->m_flags |= M_VLANTAG; 444 } 445 ifp->if_input(ifp, m); 446 } 447 } 448 449 /* 450 * Decide if a received management frame should be 451 * printed when debugging is enabled. This filters some 452 * of the less interesting frames that come frequently 453 * (e.g. beacons). 454 */ 455 static __inline int 456 doprint(struct ieee80211vap *vap, int subtype) 457 { 458 switch (subtype) { 459 case IEEE80211_FC0_SUBTYPE_BEACON: 460 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 461 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 462 return 0; 463 } 464 return 1; 465 } 466 467 /* 468 * Process a received frame. The node associated with the sender 469 * should be supplied. If nothing was found in the node table then 470 * the caller is assumed to supply a reference to iv_bss instead. 471 * The RSSI and a timestamp are also supplied. The RSSI data is used 472 * during AP scanning to select a AP to associate with; it can have 473 * any units so long as values have consistent units and higher values 474 * mean ``better signal''. The receive timestamp is currently not used 475 * by the 802.11 layer. 476 */ 477 static int 478 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 479 { 480 #define HAS_SEQ(type) ((type & 0x4) == 0) 481 struct ieee80211vap *vap = ni->ni_vap; 482 struct ieee80211com *ic = ni->ni_ic; 483 struct ifnet *ifp = vap->iv_ifp; 484 struct ieee80211_frame *wh; 485 struct ieee80211_key *key; 486 struct ether_header *eh; 487 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 488 uint8_t dir, type, subtype, qos; 489 uint8_t *bssid; 490 uint16_t rxseq; 491 492 if (m->m_flags & M_AMPDU_MPDU) { 493 /* 494 * Fastpath for A-MPDU reorder q resubmission. Frames 495 * w/ M_AMPDU_MPDU marked have already passed through 496 * here but were received out of order and been held on 497 * the reorder queue. When resubmitted they are marked 498 * with the M_AMPDU_MPDU flag and we can bypass most of 499 * the normal processing. 500 */ 501 wh = mtod(m, struct ieee80211_frame *); 502 type = IEEE80211_FC0_TYPE_DATA; 503 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 504 subtype = IEEE80211_FC0_SUBTYPE_QOS; 505 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 506 goto resubmit_ampdu; 507 } 508 509 KASSERT(ni != NULL, ("null node")); 510 ni->ni_inact = ni->ni_inact_reload; 511 512 type = -1; /* undefined */ 513 514 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 515 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 516 ni->ni_macaddr, NULL, 517 "too short (1): len %u", m->m_pkthdr.len); 518 vap->iv_stats.is_rx_tooshort++; 519 goto out; 520 } 521 /* 522 * Bit of a cheat here, we use a pointer for a 3-address 523 * frame format but don't reference fields past outside 524 * ieee80211_frame_min w/o first validating the data is 525 * present. 526 */ 527 wh = mtod(m, struct ieee80211_frame *); 528 529 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 530 IEEE80211_FC0_VERSION_0) { 531 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 532 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 533 wh->i_fc[0], wh->i_fc[1]); 534 vap->iv_stats.is_rx_badversion++; 535 goto err; 536 } 537 538 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 539 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 540 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 541 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 542 if (dir != IEEE80211_FC1_DIR_NODS) 543 bssid = wh->i_addr1; 544 else if (type == IEEE80211_FC0_TYPE_CTL) 545 bssid = wh->i_addr1; 546 else { 547 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 548 IEEE80211_DISCARD_MAC(vap, 549 IEEE80211_MSG_ANY, ni->ni_macaddr, 550 NULL, "too short (2): len %u", 551 m->m_pkthdr.len); 552 vap->iv_stats.is_rx_tooshort++; 553 goto out; 554 } 555 bssid = wh->i_addr3; 556 } 557 /* 558 * Validate the bssid. 559 */ 560 if (!(type == IEEE80211_FC0_TYPE_MGT && 561 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 562 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 563 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 564 /* not interested in */ 565 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 566 bssid, NULL, "%s", "not to bss"); 567 vap->iv_stats.is_rx_wrongbss++; 568 goto out; 569 } 570 571 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 572 ni->ni_noise = nf; 573 if (HAS_SEQ(type)) { 574 uint8_t tid = ieee80211_gettid(wh); 575 if (IEEE80211_QOS_HAS_SEQ(wh) && 576 TID_TO_WME_AC(tid) >= WME_AC_VI) 577 ic->ic_wme.wme_hipri_traffic++; 578 rxseq = le16toh(*(uint16_t *)wh->i_seq); 579 if (! ieee80211_check_rxseq(ni, wh)) { 580 /* duplicate, discard */ 581 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 582 bssid, "duplicate", 583 "seqno <%u,%u> fragno <%u,%u> tid %u", 584 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 585 ni->ni_rxseqs[tid] >> 586 IEEE80211_SEQ_SEQ_SHIFT, 587 rxseq & IEEE80211_SEQ_FRAG_MASK, 588 ni->ni_rxseqs[tid] & 589 IEEE80211_SEQ_FRAG_MASK, 590 tid); 591 vap->iv_stats.is_rx_dup++; 592 IEEE80211_NODE_STAT(ni, rx_dup); 593 goto out; 594 } 595 ni->ni_rxseqs[tid] = rxseq; 596 } 597 } 598 599 switch (type) { 600 case IEEE80211_FC0_TYPE_DATA: 601 hdrspace = ieee80211_hdrspace(ic, wh); 602 if (m->m_len < hdrspace && 603 (m = m_pullup(m, hdrspace)) == NULL) { 604 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 605 ni->ni_macaddr, NULL, 606 "data too short: expecting %u", hdrspace); 607 vap->iv_stats.is_rx_tooshort++; 608 goto out; /* XXX */ 609 } 610 if (!(dir == IEEE80211_FC1_DIR_TODS || 611 (dir == IEEE80211_FC1_DIR_DSTODS && 612 (vap->iv_flags & IEEE80211_F_DWDS)))) { 613 if (dir != IEEE80211_FC1_DIR_DSTODS) { 614 IEEE80211_DISCARD(vap, 615 IEEE80211_MSG_INPUT, wh, "data", 616 "incorrect dir 0x%x", dir); 617 } else { 618 IEEE80211_DISCARD(vap, 619 IEEE80211_MSG_INPUT | 620 IEEE80211_MSG_WDS, wh, 621 "4-address data", 622 "%s", "DWDS not enabled"); 623 } 624 vap->iv_stats.is_rx_wrongdir++; 625 goto out; 626 } 627 /* check if source STA is associated */ 628 if (ni == vap->iv_bss) { 629 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 630 wh, "data", "%s", "unknown src"); 631 ieee80211_send_error(ni, wh->i_addr2, 632 IEEE80211_FC0_SUBTYPE_DEAUTH, 633 IEEE80211_REASON_NOT_AUTHED); 634 vap->iv_stats.is_rx_notassoc++; 635 goto err; 636 } 637 if (ni->ni_associd == 0) { 638 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 639 wh, "data", "%s", "unassoc src"); 640 IEEE80211_SEND_MGMT(ni, 641 IEEE80211_FC0_SUBTYPE_DISASSOC, 642 IEEE80211_REASON_NOT_ASSOCED); 643 vap->iv_stats.is_rx_notassoc++; 644 goto err; 645 } 646 647 /* 648 * Check for power save state change. 649 * XXX out-of-order A-MPDU frames? 650 */ 651 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 652 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 653 vap->iv_node_ps(ni, 654 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 655 /* 656 * For 4-address packets handle WDS discovery 657 * notifications. Once a WDS link is setup frames 658 * are just delivered to the WDS vap (see below). 659 */ 660 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 661 if (!ieee80211_node_is_authorized(ni)) { 662 IEEE80211_DISCARD(vap, 663 IEEE80211_MSG_INPUT | 664 IEEE80211_MSG_WDS, wh, 665 "4-address data", 666 "%s", "unauthorized port"); 667 vap->iv_stats.is_rx_unauth++; 668 IEEE80211_NODE_STAT(ni, rx_unauth); 669 goto err; 670 } 671 ieee80211_dwds_discover(ni, m); 672 return type; 673 } 674 675 /* 676 * Handle A-MPDU re-ordering. If the frame is to be 677 * processed directly then ieee80211_ampdu_reorder 678 * will return 0; otherwise it has consumed the mbuf 679 * and we should do nothing more with it. 680 */ 681 if ((m->m_flags & M_AMPDU) && 682 ieee80211_ampdu_reorder(ni, m) != 0) { 683 m = NULL; 684 goto out; 685 } 686 resubmit_ampdu: 687 688 /* 689 * Handle privacy requirements. Note that we 690 * must not be preempted from here until after 691 * we (potentially) call ieee80211_crypto_demic; 692 * otherwise we may violate assumptions in the 693 * crypto cipher modules used to do delayed update 694 * of replay sequence numbers. 695 */ 696 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 697 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 698 /* 699 * Discard encrypted frames when privacy is off. 700 */ 701 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 702 wh, "WEP", "%s", "PRIVACY off"); 703 vap->iv_stats.is_rx_noprivacy++; 704 IEEE80211_NODE_STAT(ni, rx_noprivacy); 705 goto out; 706 } 707 key = ieee80211_crypto_decap(ni, m, hdrspace); 708 if (key == NULL) { 709 /* NB: stats+msgs handled in crypto_decap */ 710 IEEE80211_NODE_STAT(ni, rx_wepfail); 711 goto out; 712 } 713 wh = mtod(m, struct ieee80211_frame *); 714 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 715 } else { 716 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 717 key = NULL; 718 } 719 720 /* 721 * Save QoS bits for use below--before we strip the header. 722 */ 723 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 724 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 725 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 726 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 727 } else 728 qos = 0; 729 730 /* 731 * Next up, any fragmentation. 732 */ 733 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 734 m = ieee80211_defrag(ni, m, hdrspace); 735 if (m == NULL) { 736 /* Fragment dropped or frame not complete yet */ 737 goto out; 738 } 739 } 740 wh = NULL; /* no longer valid, catch any uses */ 741 742 /* 743 * Next strip any MSDU crypto bits. 744 */ 745 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 746 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 747 ni->ni_macaddr, "data", "%s", "demic error"); 748 vap->iv_stats.is_rx_demicfail++; 749 IEEE80211_NODE_STAT(ni, rx_demicfail); 750 goto out; 751 } 752 /* copy to listener after decrypt */ 753 if (ieee80211_radiotap_active_vap(vap)) 754 ieee80211_radiotap_rx(vap, m); 755 need_tap = 0; 756 /* 757 * Finally, strip the 802.11 header. 758 */ 759 m = ieee80211_decap(vap, m, hdrspace); 760 if (m == NULL) { 761 /* XXX mask bit to check for both */ 762 /* don't count Null data frames as errors */ 763 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 764 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 765 goto out; 766 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 767 ni->ni_macaddr, "data", "%s", "decap error"); 768 vap->iv_stats.is_rx_decap++; 769 IEEE80211_NODE_STAT(ni, rx_decap); 770 goto err; 771 } 772 eh = mtod(m, struct ether_header *); 773 if (!ieee80211_node_is_authorized(ni)) { 774 /* 775 * Deny any non-PAE frames received prior to 776 * authorization. For open/shared-key 777 * authentication the port is mark authorized 778 * after authentication completes. For 802.1x 779 * the port is not marked authorized by the 780 * authenticator until the handshake has completed. 781 */ 782 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 783 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 784 eh->ether_shost, "data", 785 "unauthorized port: ether type 0x%x len %u", 786 eh->ether_type, m->m_pkthdr.len); 787 vap->iv_stats.is_rx_unauth++; 788 IEEE80211_NODE_STAT(ni, rx_unauth); 789 goto err; 790 } 791 } else { 792 /* 793 * When denying unencrypted frames, discard 794 * any non-PAE frames received without encryption. 795 */ 796 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 797 (key == NULL && (m->m_flags & M_WEP) == 0) && 798 eh->ether_type != htons(ETHERTYPE_PAE)) { 799 /* 800 * Drop unencrypted frames. 801 */ 802 vap->iv_stats.is_rx_unencrypted++; 803 IEEE80211_NODE_STAT(ni, rx_unencrypted); 804 goto out; 805 } 806 } 807 /* XXX require HT? */ 808 if (qos & IEEE80211_QOS_AMSDU) { 809 m = ieee80211_decap_amsdu(ni, m); 810 if (m == NULL) 811 return IEEE80211_FC0_TYPE_DATA; 812 } else { 813 #ifdef IEEE80211_SUPPORT_SUPERG 814 m = ieee80211_decap_fastframe(vap, ni, m); 815 if (m == NULL) 816 return IEEE80211_FC0_TYPE_DATA; 817 #endif 818 } 819 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 820 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 821 else 822 hostap_deliver_data(vap, ni, m); 823 return IEEE80211_FC0_TYPE_DATA; 824 825 case IEEE80211_FC0_TYPE_MGT: 826 vap->iv_stats.is_rx_mgmt++; 827 IEEE80211_NODE_STAT(ni, rx_mgmt); 828 if (dir != IEEE80211_FC1_DIR_NODS) { 829 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 830 wh, "mgt", "incorrect dir 0x%x", dir); 831 vap->iv_stats.is_rx_wrongdir++; 832 goto err; 833 } 834 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 835 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 836 ni->ni_macaddr, "mgt", "too short: len %u", 837 m->m_pkthdr.len); 838 vap->iv_stats.is_rx_tooshort++; 839 goto out; 840 } 841 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 842 /* ensure return frames are unicast */ 843 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 844 wh, NULL, "source is multicast: %s", 845 ether_sprintf(wh->i_addr2)); 846 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 847 goto out; 848 } 849 #ifdef IEEE80211_DEBUG 850 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 851 ieee80211_msg_dumppkts(vap)) { 852 if_printf(ifp, "received %s from %s rssi %d\n", 853 ieee80211_mgt_subtype_name[subtype >> 854 IEEE80211_FC0_SUBTYPE_SHIFT], 855 ether_sprintf(wh->i_addr2), rssi); 856 } 857 #endif 858 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 859 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 860 /* 861 * Only shared key auth frames with a challenge 862 * should be encrypted, discard all others. 863 */ 864 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 865 wh, NULL, 866 "%s", "WEP set but not permitted"); 867 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 868 goto out; 869 } 870 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 871 /* 872 * Discard encrypted frames when privacy is off. 873 */ 874 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 875 wh, NULL, "%s", "WEP set but PRIVACY off"); 876 vap->iv_stats.is_rx_noprivacy++; 877 goto out; 878 } 879 hdrspace = ieee80211_hdrspace(ic, wh); 880 key = ieee80211_crypto_decap(ni, m, hdrspace); 881 if (key == NULL) { 882 /* NB: stats+msgs handled in crypto_decap */ 883 goto out; 884 } 885 wh = mtod(m, struct ieee80211_frame *); 886 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 887 } 888 /* 889 * Pass the packet to radiotap before calling iv_recv_mgmt(). 890 * Otherwise iv_recv_mgmt() might pass another packet to 891 * radiotap, resulting in out of order packet captures. 892 */ 893 if (ieee80211_radiotap_active_vap(vap)) 894 ieee80211_radiotap_rx(vap, m); 895 need_tap = 0; 896 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 897 goto out; 898 899 case IEEE80211_FC0_TYPE_CTL: 900 vap->iv_stats.is_rx_ctl++; 901 IEEE80211_NODE_STAT(ni, rx_ctrl); 902 vap->iv_recv_ctl(ni, m, subtype); 903 goto out; 904 default: 905 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 906 wh, "bad", "frame type 0x%x", type); 907 /* should not come here */ 908 break; 909 } 910 err: 911 ifp->if_ierrors++; 912 out: 913 if (m != NULL) { 914 if (need_tap && ieee80211_radiotap_active_vap(vap)) 915 ieee80211_radiotap_rx(vap, m); 916 m_freem(m); 917 } 918 return type; 919 } 920 921 static void 922 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 923 int rssi, int nf, uint16_t seq, uint16_t status) 924 { 925 struct ieee80211vap *vap = ni->ni_vap; 926 927 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 928 929 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 930 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 931 ni->ni_macaddr, "open auth", 932 "bad sta auth mode %u", ni->ni_authmode); 933 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 934 /* 935 * Clear any challenge text that may be there if 936 * a previous shared key auth failed and then an 937 * open auth is attempted. 938 */ 939 if (ni->ni_challenge != NULL) { 940 free(ni->ni_challenge, M_80211_NODE); 941 ni->ni_challenge = NULL; 942 } 943 /* XXX hack to workaround calling convention */ 944 ieee80211_send_error(ni, wh->i_addr2, 945 IEEE80211_FC0_SUBTYPE_AUTH, 946 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 947 return; 948 } 949 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 950 vap->iv_stats.is_rx_bad_auth++; 951 return; 952 } 953 /* always accept open authentication requests */ 954 if (ni == vap->iv_bss) { 955 ni = ieee80211_dup_bss(vap, wh->i_addr2); 956 if (ni == NULL) 957 return; 958 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 959 (void) ieee80211_ref_node(ni); 960 /* 961 * Mark the node as referenced to reflect that it's 962 * reference count has been bumped to insure it remains 963 * after the transaction completes. 964 */ 965 ni->ni_flags |= IEEE80211_NODE_AREF; 966 /* 967 * Mark the node as requiring a valid association id 968 * before outbound traffic is permitted. 969 */ 970 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 971 972 if (vap->iv_acl != NULL && 973 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 974 /* 975 * When the ACL policy is set to RADIUS we defer the 976 * authorization to a user agent. Dispatch an event, 977 * a subsequent MLME call will decide the fate of the 978 * station. If the user agent is not present then the 979 * node will be reclaimed due to inactivity. 980 */ 981 IEEE80211_NOTE_MAC(vap, 982 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 983 "%s", "station authentication defered (radius acl)"); 984 ieee80211_notify_node_auth(ni); 985 } else { 986 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 987 IEEE80211_NOTE_MAC(vap, 988 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 989 "%s", "station authenticated (open)"); 990 /* 991 * When 802.1x is not in use mark the port 992 * authorized at this point so traffic can flow. 993 */ 994 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 995 ieee80211_node_authorize(ni); 996 } 997 } 998 999 static void 1000 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 1001 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 1002 uint16_t seq, uint16_t status) 1003 { 1004 struct ieee80211vap *vap = ni->ni_vap; 1005 uint8_t *challenge; 1006 int allocbs, estatus; 1007 1008 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 1009 1010 /* 1011 * NB: this can happen as we allow pre-shared key 1012 * authentication to be enabled w/o wep being turned 1013 * on so that configuration of these can be done 1014 * in any order. It may be better to enforce the 1015 * ordering in which case this check would just be 1016 * for sanity/consistency. 1017 */ 1018 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1019 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1020 ni->ni_macaddr, "shared key auth", 1021 "%s", " PRIVACY is disabled"); 1022 estatus = IEEE80211_STATUS_ALG; 1023 goto bad; 1024 } 1025 /* 1026 * Pre-shared key authentication is evil; accept 1027 * it only if explicitly configured (it is supported 1028 * mainly for compatibility with clients like Mac OS X). 1029 */ 1030 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1031 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1032 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1033 ni->ni_macaddr, "shared key auth", 1034 "bad sta auth mode %u", ni->ni_authmode); 1035 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1036 estatus = IEEE80211_STATUS_ALG; 1037 goto bad; 1038 } 1039 1040 challenge = NULL; 1041 if (frm + 1 < efrm) { 1042 if ((frm[1] + 2) > (efrm - frm)) { 1043 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1044 ni->ni_macaddr, "shared key auth", 1045 "ie %d/%d too long", 1046 frm[0], (frm[1] + 2) - (efrm - frm)); 1047 vap->iv_stats.is_rx_bad_auth++; 1048 estatus = IEEE80211_STATUS_CHALLENGE; 1049 goto bad; 1050 } 1051 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1052 challenge = frm; 1053 frm += frm[1] + 2; 1054 } 1055 switch (seq) { 1056 case IEEE80211_AUTH_SHARED_CHALLENGE: 1057 case IEEE80211_AUTH_SHARED_RESPONSE: 1058 if (challenge == NULL) { 1059 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1060 ni->ni_macaddr, "shared key auth", 1061 "%s", "no challenge"); 1062 vap->iv_stats.is_rx_bad_auth++; 1063 estatus = IEEE80211_STATUS_CHALLENGE; 1064 goto bad; 1065 } 1066 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1067 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1068 ni->ni_macaddr, "shared key auth", 1069 "bad challenge len %d", challenge[1]); 1070 vap->iv_stats.is_rx_bad_auth++; 1071 estatus = IEEE80211_STATUS_CHALLENGE; 1072 goto bad; 1073 } 1074 default: 1075 break; 1076 } 1077 switch (seq) { 1078 case IEEE80211_AUTH_SHARED_REQUEST: 1079 if (ni == vap->iv_bss) { 1080 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1081 if (ni == NULL) { 1082 /* NB: no way to return an error */ 1083 return; 1084 } 1085 allocbs = 1; 1086 } else { 1087 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1088 (void) ieee80211_ref_node(ni); 1089 allocbs = 0; 1090 } 1091 /* 1092 * Mark the node as referenced to reflect that it's 1093 * reference count has been bumped to insure it remains 1094 * after the transaction completes. 1095 */ 1096 ni->ni_flags |= IEEE80211_NODE_AREF; 1097 /* 1098 * Mark the node as requiring a valid associatio id 1099 * before outbound traffic is permitted. 1100 */ 1101 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1102 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1103 ni->ni_noise = nf; 1104 if (!ieee80211_alloc_challenge(ni)) { 1105 /* NB: don't return error so they rexmit */ 1106 return; 1107 } 1108 get_random_bytes(ni->ni_challenge, 1109 IEEE80211_CHALLENGE_LEN); 1110 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1111 ni, "shared key %sauth request", allocbs ? "" : "re"); 1112 /* 1113 * When the ACL policy is set to RADIUS we defer the 1114 * authorization to a user agent. Dispatch an event, 1115 * a subsequent MLME call will decide the fate of the 1116 * station. If the user agent is not present then the 1117 * node will be reclaimed due to inactivity. 1118 */ 1119 if (vap->iv_acl != NULL && 1120 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1121 IEEE80211_NOTE_MAC(vap, 1122 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1123 ni->ni_macaddr, 1124 "%s", "station authentication defered (radius acl)"); 1125 ieee80211_notify_node_auth(ni); 1126 return; 1127 } 1128 break; 1129 case IEEE80211_AUTH_SHARED_RESPONSE: 1130 if (ni == vap->iv_bss) { 1131 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1132 ni->ni_macaddr, "shared key response", 1133 "%s", "unknown station"); 1134 /* NB: don't send a response */ 1135 return; 1136 } 1137 if (ni->ni_challenge == NULL) { 1138 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1139 ni->ni_macaddr, "shared key response", 1140 "%s", "no challenge recorded"); 1141 vap->iv_stats.is_rx_bad_auth++; 1142 estatus = IEEE80211_STATUS_CHALLENGE; 1143 goto bad; 1144 } 1145 if (memcmp(ni->ni_challenge, &challenge[2], 1146 challenge[1]) != 0) { 1147 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1148 ni->ni_macaddr, "shared key response", 1149 "%s", "challenge mismatch"); 1150 vap->iv_stats.is_rx_auth_fail++; 1151 estatus = IEEE80211_STATUS_CHALLENGE; 1152 goto bad; 1153 } 1154 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1155 ni, "%s", "station authenticated (shared key)"); 1156 ieee80211_node_authorize(ni); 1157 break; 1158 default: 1159 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1160 ni->ni_macaddr, "shared key auth", 1161 "bad seq %d", seq); 1162 vap->iv_stats.is_rx_bad_auth++; 1163 estatus = IEEE80211_STATUS_SEQUENCE; 1164 goto bad; 1165 } 1166 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1167 return; 1168 bad: 1169 /* 1170 * Send an error response; but only when operating as an AP. 1171 */ 1172 /* XXX hack to workaround calling convention */ 1173 ieee80211_send_error(ni, wh->i_addr2, 1174 IEEE80211_FC0_SUBTYPE_AUTH, 1175 (seq + 1) | (estatus<<16)); 1176 } 1177 1178 /* 1179 * Convert a WPA cipher selector OUI to an internal 1180 * cipher algorithm. Where appropriate we also 1181 * record any key length. 1182 */ 1183 static int 1184 wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1185 { 1186 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1187 uint32_t w = LE_READ_4(sel); 1188 1189 switch (w) { 1190 case WPA_SEL(WPA_CSE_NULL): 1191 return IEEE80211_CIPHER_NONE; 1192 case WPA_SEL(WPA_CSE_WEP40): 1193 if (keylen) 1194 *keylen = 40 / NBBY; 1195 return IEEE80211_CIPHER_WEP; 1196 case WPA_SEL(WPA_CSE_WEP104): 1197 if (keylen) 1198 *keylen = 104 / NBBY; 1199 return IEEE80211_CIPHER_WEP; 1200 case WPA_SEL(WPA_CSE_TKIP): 1201 return IEEE80211_CIPHER_TKIP; 1202 case WPA_SEL(WPA_CSE_CCMP): 1203 return IEEE80211_CIPHER_AES_CCM; 1204 } 1205 return 32; /* NB: so 1<< is discarded */ 1206 #undef WPA_SEL 1207 } 1208 1209 /* 1210 * Convert a WPA key management/authentication algorithm 1211 * to an internal code. 1212 */ 1213 static int 1214 wpa_keymgmt(const uint8_t *sel) 1215 { 1216 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1217 uint32_t w = LE_READ_4(sel); 1218 1219 switch (w) { 1220 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1221 return WPA_ASE_8021X_UNSPEC; 1222 case WPA_SEL(WPA_ASE_8021X_PSK): 1223 return WPA_ASE_8021X_PSK; 1224 case WPA_SEL(WPA_ASE_NONE): 1225 return WPA_ASE_NONE; 1226 } 1227 return 0; /* NB: so is discarded */ 1228 #undef WPA_SEL 1229 } 1230 1231 /* 1232 * Parse a WPA information element to collect parameters. 1233 * Note that we do not validate security parameters; that 1234 * is handled by the authenticator; the parsing done here 1235 * is just for internal use in making operational decisions. 1236 */ 1237 static int 1238 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1239 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1240 { 1241 uint8_t len = frm[1]; 1242 uint32_t w; 1243 int n; 1244 1245 /* 1246 * Check the length once for fixed parts: OUI, type, 1247 * version, mcast cipher, and 2 selector counts. 1248 * Other, variable-length data, must be checked separately. 1249 */ 1250 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1251 IEEE80211_DISCARD_IE(vap, 1252 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1253 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1254 return IEEE80211_REASON_IE_INVALID; 1255 } 1256 if (len < 14) { 1257 IEEE80211_DISCARD_IE(vap, 1258 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1259 wh, "WPA", "too short, len %u", len); 1260 return IEEE80211_REASON_IE_INVALID; 1261 } 1262 frm += 6, len -= 4; /* NB: len is payload only */ 1263 /* NB: iswpaoui already validated the OUI and type */ 1264 w = LE_READ_2(frm); 1265 if (w != WPA_VERSION) { 1266 IEEE80211_DISCARD_IE(vap, 1267 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1268 wh, "WPA", "bad version %u", w); 1269 return IEEE80211_REASON_IE_INVALID; 1270 } 1271 frm += 2, len -= 2; 1272 1273 memset(rsn, 0, sizeof(*rsn)); 1274 1275 /* multicast/group cipher */ 1276 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1277 frm += 4, len -= 4; 1278 1279 /* unicast ciphers */ 1280 n = LE_READ_2(frm); 1281 frm += 2, len -= 2; 1282 if (len < n*4+2) { 1283 IEEE80211_DISCARD_IE(vap, 1284 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1285 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1286 len, n); 1287 return IEEE80211_REASON_IE_INVALID; 1288 } 1289 w = 0; 1290 for (; n > 0; n--) { 1291 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1292 frm += 4, len -= 4; 1293 } 1294 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1295 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1296 else 1297 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1298 1299 /* key management algorithms */ 1300 n = LE_READ_2(frm); 1301 frm += 2, len -= 2; 1302 if (len < n*4) { 1303 IEEE80211_DISCARD_IE(vap, 1304 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1305 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1306 len, n); 1307 return IEEE80211_REASON_IE_INVALID; 1308 } 1309 w = 0; 1310 for (; n > 0; n--) { 1311 w |= wpa_keymgmt(frm); 1312 frm += 4, len -= 4; 1313 } 1314 if (w & WPA_ASE_8021X_UNSPEC) 1315 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1316 else 1317 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1318 1319 if (len > 2) /* optional capabilities */ 1320 rsn->rsn_caps = LE_READ_2(frm); 1321 1322 return 0; 1323 } 1324 1325 /* 1326 * Convert an RSN cipher selector OUI to an internal 1327 * cipher algorithm. Where appropriate we also 1328 * record any key length. 1329 */ 1330 static int 1331 rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1332 { 1333 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1334 uint32_t w = LE_READ_4(sel); 1335 1336 switch (w) { 1337 case RSN_SEL(RSN_CSE_NULL): 1338 return IEEE80211_CIPHER_NONE; 1339 case RSN_SEL(RSN_CSE_WEP40): 1340 if (keylen) 1341 *keylen = 40 / NBBY; 1342 return IEEE80211_CIPHER_WEP; 1343 case RSN_SEL(RSN_CSE_WEP104): 1344 if (keylen) 1345 *keylen = 104 / NBBY; 1346 return IEEE80211_CIPHER_WEP; 1347 case RSN_SEL(RSN_CSE_TKIP): 1348 return IEEE80211_CIPHER_TKIP; 1349 case RSN_SEL(RSN_CSE_CCMP): 1350 return IEEE80211_CIPHER_AES_CCM; 1351 case RSN_SEL(RSN_CSE_WRAP): 1352 return IEEE80211_CIPHER_AES_OCB; 1353 } 1354 return 32; /* NB: so 1<< is discarded */ 1355 #undef WPA_SEL 1356 } 1357 1358 /* 1359 * Convert an RSN key management/authentication algorithm 1360 * to an internal code. 1361 */ 1362 static int 1363 rsn_keymgmt(const uint8_t *sel) 1364 { 1365 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1366 uint32_t w = LE_READ_4(sel); 1367 1368 switch (w) { 1369 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1370 return RSN_ASE_8021X_UNSPEC; 1371 case RSN_SEL(RSN_ASE_8021X_PSK): 1372 return RSN_ASE_8021X_PSK; 1373 case RSN_SEL(RSN_ASE_NONE): 1374 return RSN_ASE_NONE; 1375 } 1376 return 0; /* NB: so is discarded */ 1377 #undef RSN_SEL 1378 } 1379 1380 /* 1381 * Parse a WPA/RSN information element to collect parameters 1382 * and validate the parameters against what has been 1383 * configured for the system. 1384 */ 1385 static int 1386 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1387 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1388 { 1389 uint8_t len = frm[1]; 1390 uint32_t w; 1391 int n; 1392 1393 /* 1394 * Check the length once for fixed parts: 1395 * version, mcast cipher, and 2 selector counts. 1396 * Other, variable-length data, must be checked separately. 1397 */ 1398 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1399 IEEE80211_DISCARD_IE(vap, 1400 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1401 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1402 return IEEE80211_REASON_IE_INVALID; 1403 } 1404 if (len < 10) { 1405 IEEE80211_DISCARD_IE(vap, 1406 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1407 wh, "RSN", "too short, len %u", len); 1408 return IEEE80211_REASON_IE_INVALID; 1409 } 1410 frm += 2; 1411 w = LE_READ_2(frm); 1412 if (w != RSN_VERSION) { 1413 IEEE80211_DISCARD_IE(vap, 1414 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1415 wh, "RSN", "bad version %u", w); 1416 return IEEE80211_REASON_IE_INVALID; 1417 } 1418 frm += 2, len -= 2; 1419 1420 memset(rsn, 0, sizeof(*rsn)); 1421 1422 /* multicast/group cipher */ 1423 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1424 frm += 4, len -= 4; 1425 1426 /* unicast ciphers */ 1427 n = LE_READ_2(frm); 1428 frm += 2, len -= 2; 1429 if (len < n*4+2) { 1430 IEEE80211_DISCARD_IE(vap, 1431 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1432 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1433 len, n); 1434 return IEEE80211_REASON_IE_INVALID; 1435 } 1436 w = 0; 1437 for (; n > 0; n--) { 1438 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1439 frm += 4, len -= 4; 1440 } 1441 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1442 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1443 else 1444 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1445 1446 /* key management algorithms */ 1447 n = LE_READ_2(frm); 1448 frm += 2, len -= 2; 1449 if (len < n*4) { 1450 IEEE80211_DISCARD_IE(vap, 1451 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1452 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1453 len, n); 1454 return IEEE80211_REASON_IE_INVALID; 1455 } 1456 w = 0; 1457 for (; n > 0; n--) { 1458 w |= rsn_keymgmt(frm); 1459 frm += 4, len -= 4; 1460 } 1461 if (w & RSN_ASE_8021X_UNSPEC) 1462 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1463 else 1464 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1465 1466 /* optional RSN capabilities */ 1467 if (len > 2) 1468 rsn->rsn_caps = LE_READ_2(frm); 1469 /* XXXPMKID */ 1470 1471 return 0; 1472 } 1473 1474 /* 1475 * WPA/802.11i assocation request processing. 1476 */ 1477 static int 1478 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1479 const struct ieee80211_frame *wh, const uint8_t *wpa, 1480 const uint8_t *rsn, uint16_t capinfo) 1481 { 1482 struct ieee80211vap *vap = ni->ni_vap; 1483 uint8_t reason; 1484 int badwparsn; 1485 1486 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1487 if (wpa == NULL && rsn == NULL) { 1488 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1489 /* 1490 * W-Fi Protected Setup (WPS) permits 1491 * clients to associate and pass EAPOL frames 1492 * to establish initial credentials. 1493 */ 1494 ni->ni_flags |= IEEE80211_NODE_WPS; 1495 return 1; 1496 } 1497 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1498 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1499 /* 1500 * Transitional Security Network. Permits clients 1501 * to associate and use WEP while WPA is configured. 1502 */ 1503 ni->ni_flags |= IEEE80211_NODE_TSN; 1504 return 1; 1505 } 1506 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1507 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1508 vap->iv_stats.is_rx_assoc_badwpaie++; 1509 reason = IEEE80211_REASON_IE_INVALID; 1510 goto bad; 1511 } 1512 /* assert right association security credentials */ 1513 badwparsn = 0; /* NB: to silence compiler */ 1514 switch (vap->iv_flags & IEEE80211_F_WPA) { 1515 case IEEE80211_F_WPA1: 1516 badwparsn = (wpa == NULL); 1517 break; 1518 case IEEE80211_F_WPA2: 1519 badwparsn = (rsn == NULL); 1520 break; 1521 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1522 badwparsn = (wpa == NULL && rsn == NULL); 1523 break; 1524 } 1525 if (badwparsn) { 1526 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1527 wh, NULL, 1528 "%s", "missing WPA/RSN IE in association request"); 1529 vap->iv_stats.is_rx_assoc_badwpaie++; 1530 reason = IEEE80211_REASON_IE_INVALID; 1531 goto bad; 1532 } 1533 /* 1534 * Parse WPA/RSN information element. 1535 */ 1536 if (wpa != NULL) 1537 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1538 else 1539 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1540 if (reason != 0) { 1541 /* XXX distinguish WPA/RSN? */ 1542 vap->iv_stats.is_rx_assoc_badwpaie++; 1543 goto bad; 1544 } 1545 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1546 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1547 wpa != NULL ? "WPA" : "RSN", 1548 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1549 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1550 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1551 1552 return 1; 1553 bad: 1554 ieee80211_node_deauth(ni, reason); 1555 return 0; 1556 } 1557 1558 /* XXX find a better place for definition */ 1559 struct l2_update_frame { 1560 struct ether_header eh; 1561 uint8_t dsap; 1562 uint8_t ssap; 1563 uint8_t control; 1564 uint8_t xid[3]; 1565 } __packed; 1566 1567 /* 1568 * Deliver a TGf L2UF frame on behalf of a station. 1569 * This primes any bridge when the station is roaming 1570 * between ap's on the same wired network. 1571 */ 1572 static void 1573 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1574 { 1575 struct ieee80211vap *vap = ni->ni_vap; 1576 struct ifnet *ifp = vap->iv_ifp; 1577 struct mbuf *m; 1578 struct l2_update_frame *l2uf; 1579 struct ether_header *eh; 1580 1581 m = m_gethdr(M_NOWAIT, MT_DATA); 1582 if (m == NULL) { 1583 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1584 "%s", "no mbuf for l2uf frame"); 1585 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1586 return; 1587 } 1588 l2uf = mtod(m, struct l2_update_frame *); 1589 eh = &l2uf->eh; 1590 /* dst: Broadcast address */ 1591 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1592 /* src: associated STA */ 1593 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1594 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1595 1596 l2uf->dsap = 0; 1597 l2uf->ssap = 0; 1598 l2uf->control = 0xf5; 1599 l2uf->xid[0] = 0x81; 1600 l2uf->xid[1] = 0x80; 1601 l2uf->xid[2] = 0x00; 1602 1603 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1604 hostap_deliver_data(vap, ni, m); 1605 } 1606 1607 static void 1608 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1609 int reassoc, int resp, const char *tag, int rate) 1610 { 1611 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1612 "deny %s request, %s rate set mismatch, rate/MCS %d", 1613 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1614 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1615 ieee80211_node_leave(ni); 1616 } 1617 1618 static void 1619 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1620 int reassoc, int resp, const char *tag, int capinfo) 1621 { 1622 struct ieee80211vap *vap = ni->ni_vap; 1623 1624 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1625 "deny %s request, %s mismatch 0x%x", 1626 reassoc ? "reassoc" : "assoc", tag, capinfo); 1627 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1628 ieee80211_node_leave(ni); 1629 vap->iv_stats.is_rx_assoc_capmismatch++; 1630 } 1631 1632 static void 1633 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1634 int reassoc, int resp) 1635 { 1636 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1637 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1638 /* XXX no better code */ 1639 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1640 ieee80211_node_leave(ni); 1641 } 1642 1643 static void 1644 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1645 int algo, int seq, int status) 1646 { 1647 struct ieee80211vap *vap = ni->ni_vap; 1648 1649 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1650 wh, NULL, "unsupported alg %d", algo); 1651 vap->iv_stats.is_rx_auth_unsupported++; 1652 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1653 seq | (status << 16)); 1654 } 1655 1656 static __inline int 1657 ishtmixed(const uint8_t *ie) 1658 { 1659 const struct ieee80211_ie_htinfo *ht = 1660 (const struct ieee80211_ie_htinfo *) ie; 1661 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1662 IEEE80211_HTINFO_OPMODE_MIXED; 1663 } 1664 1665 static int 1666 is11bclient(const uint8_t *rates, const uint8_t *xrates) 1667 { 1668 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1669 int i; 1670 1671 /* NB: the 11b clients we care about will not have xrates */ 1672 if (xrates != NULL || rates == NULL) 1673 return 0; 1674 for (i = 0; i < rates[1]; i++) { 1675 int r = rates[2+i] & IEEE80211_RATE_VAL; 1676 if (r > 2*11 || ((1<<r) & brates) == 0) 1677 return 0; 1678 } 1679 return 1; 1680 } 1681 1682 static void 1683 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1684 int subtype, int rssi, int nf) 1685 { 1686 struct ieee80211vap *vap = ni->ni_vap; 1687 struct ieee80211com *ic = ni->ni_ic; 1688 struct ieee80211_frame *wh; 1689 uint8_t *frm, *efrm, *sfrm; 1690 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1691 int reassoc, resp; 1692 uint8_t rate; 1693 1694 wh = mtod(m0, struct ieee80211_frame *); 1695 frm = (uint8_t *)&wh[1]; 1696 efrm = mtod(m0, uint8_t *) + m0->m_len; 1697 switch (subtype) { 1698 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1699 case IEEE80211_FC0_SUBTYPE_BEACON: { 1700 struct ieee80211_scanparams scan; 1701 /* 1702 * We process beacon/probe response frames when scanning; 1703 * otherwise we check beacon frames for overlapping non-ERP 1704 * BSS in 11g and/or overlapping legacy BSS when in HT. 1705 */ 1706 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1707 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1708 vap->iv_stats.is_rx_mgtdiscard++; 1709 return; 1710 } 1711 /* NB: accept off-channel frames */ 1712 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1713 return; 1714 /* 1715 * Count frame now that we know it's to be processed. 1716 */ 1717 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1718 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1719 IEEE80211_NODE_STAT(ni, rx_beacons); 1720 } else 1721 IEEE80211_NODE_STAT(ni, rx_proberesp); 1722 /* 1723 * If scanning, just pass information to the scan module. 1724 */ 1725 if (ic->ic_flags & IEEE80211_F_SCAN) { 1726 if (scan.status == 0 && /* NB: on channel */ 1727 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1728 /* 1729 * Actively scanning a channel marked passive; 1730 * send a probe request now that we know there 1731 * is 802.11 traffic present. 1732 * 1733 * XXX check if the beacon we recv'd gives 1734 * us what we need and suppress the probe req 1735 */ 1736 ieee80211_probe_curchan(vap, 1); 1737 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1738 } 1739 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1740 return; 1741 } 1742 /* 1743 * Check beacon for overlapping bss w/ non ERP stations. 1744 * If we detect one and protection is configured but not 1745 * enabled, enable it and start a timer that'll bring us 1746 * out if we stop seeing the bss. 1747 */ 1748 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1749 scan.status == 0 && /* NB: on-channel */ 1750 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1751 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1752 ic->ic_lastnonerp = ticks; 1753 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1754 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1755 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1756 IEEE80211_NOTE_FRAME(vap, 1757 IEEE80211_MSG_ASSOC, wh, 1758 "non-ERP present on channel %d " 1759 "(saw erp 0x%x from channel %d), " 1760 "enable use of protection", 1761 ic->ic_curchan->ic_ieee, 1762 scan.erp, scan.chan); 1763 ic->ic_flags |= IEEE80211_F_USEPROT; 1764 ieee80211_notify_erp(ic); 1765 } 1766 } 1767 /* 1768 * Check beacon for non-HT station on HT channel 1769 * and update HT BSS occupancy as appropriate. 1770 */ 1771 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1772 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1773 /* 1774 * Off control channel; only check frames 1775 * that come in the extension channel when 1776 * operating w/ HT40. 1777 */ 1778 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1779 break; 1780 if (scan.chan != ic->ic_curchan->ic_extieee) 1781 break; 1782 } 1783 if (scan.htinfo == NULL) { 1784 ieee80211_htprot_update(ic, 1785 IEEE80211_HTINFO_OPMODE_PROTOPT | 1786 IEEE80211_HTINFO_NONHT_PRESENT); 1787 } else if (ishtmixed(scan.htinfo)) { 1788 /* XXX? take NONHT_PRESENT from beacon? */ 1789 ieee80211_htprot_update(ic, 1790 IEEE80211_HTINFO_OPMODE_MIXED | 1791 IEEE80211_HTINFO_NONHT_PRESENT); 1792 } 1793 } 1794 break; 1795 } 1796 1797 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1798 if (vap->iv_state != IEEE80211_S_RUN) { 1799 vap->iv_stats.is_rx_mgtdiscard++; 1800 return; 1801 } 1802 /* 1803 * Consult the ACL policy module if setup. 1804 */ 1805 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1806 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1807 wh, NULL, "%s", "disallowed by ACL"); 1808 vap->iv_stats.is_rx_acl++; 1809 return; 1810 } 1811 /* 1812 * prreq frame format 1813 * [tlv] ssid 1814 * [tlv] supported rates 1815 * [tlv] extended supported rates 1816 */ 1817 ssid = rates = xrates = NULL; 1818 sfrm = frm; 1819 while (efrm - frm > 1) { 1820 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1821 switch (*frm) { 1822 case IEEE80211_ELEMID_SSID: 1823 ssid = frm; 1824 break; 1825 case IEEE80211_ELEMID_RATES: 1826 rates = frm; 1827 break; 1828 case IEEE80211_ELEMID_XRATES: 1829 xrates = frm; 1830 break; 1831 } 1832 frm += frm[1] + 2; 1833 } 1834 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1835 if (xrates != NULL) 1836 IEEE80211_VERIFY_ELEMENT(xrates, 1837 IEEE80211_RATE_MAXSIZE - rates[1], return); 1838 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1839 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1840 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1841 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1842 wh, NULL, 1843 "%s", "no ssid with ssid suppression enabled"); 1844 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1845 return; 1846 } 1847 1848 /* XXX find a better class or define it's own */ 1849 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1850 "%s", "recv probe req"); 1851 /* 1852 * Some legacy 11b clients cannot hack a complete 1853 * probe response frame. When the request includes 1854 * only a bare-bones rate set, communicate this to 1855 * the transmit side. 1856 */ 1857 ieee80211_send_proberesp(vap, wh->i_addr2, 1858 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1859 break; 1860 1861 case IEEE80211_FC0_SUBTYPE_AUTH: { 1862 uint16_t algo, seq, status; 1863 1864 if (vap->iv_state != IEEE80211_S_RUN) { 1865 vap->iv_stats.is_rx_mgtdiscard++; 1866 return; 1867 } 1868 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1869 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1870 wh, NULL, "%s", "wrong bssid"); 1871 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1872 return; 1873 } 1874 /* 1875 * auth frame format 1876 * [2] algorithm 1877 * [2] sequence 1878 * [2] status 1879 * [tlv*] challenge 1880 */ 1881 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1882 algo = le16toh(*(uint16_t *)frm); 1883 seq = le16toh(*(uint16_t *)(frm + 2)); 1884 status = le16toh(*(uint16_t *)(frm + 4)); 1885 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1886 "recv auth frame with algorithm %d seq %d", algo, seq); 1887 /* 1888 * Consult the ACL policy module if setup. 1889 */ 1890 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1891 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1892 wh, NULL, "%s", "disallowed by ACL"); 1893 vap->iv_stats.is_rx_acl++; 1894 ieee80211_send_error(ni, wh->i_addr2, 1895 IEEE80211_FC0_SUBTYPE_AUTH, 1896 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1897 return; 1898 } 1899 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1900 IEEE80211_DISCARD(vap, 1901 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1902 wh, NULL, "%s", "TKIP countermeasures enabled"); 1903 vap->iv_stats.is_rx_auth_countermeasures++; 1904 ieee80211_send_error(ni, wh->i_addr2, 1905 IEEE80211_FC0_SUBTYPE_AUTH, 1906 IEEE80211_REASON_MIC_FAILURE); 1907 return; 1908 } 1909 if (algo == IEEE80211_AUTH_ALG_SHARED) 1910 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1911 seq, status); 1912 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1913 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1914 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1915 authalgreject(ni, wh, algo, 1916 seq+1, IEEE80211_STATUS_ALG); 1917 return; 1918 } else { 1919 /* 1920 * We assume that an unknown algorithm is the result 1921 * of a decryption failure on a shared key auth frame; 1922 * return a status code appropriate for that instead 1923 * of IEEE80211_STATUS_ALG. 1924 * 1925 * NB: a seq# of 4 is intentional; the decrypted 1926 * frame likely has a bogus seq value. 1927 */ 1928 authalgreject(ni, wh, algo, 1929 4, IEEE80211_STATUS_CHALLENGE); 1930 return; 1931 } 1932 break; 1933 } 1934 1935 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1936 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1937 uint16_t capinfo, lintval; 1938 struct ieee80211_rsnparms rsnparms; 1939 1940 if (vap->iv_state != IEEE80211_S_RUN) { 1941 vap->iv_stats.is_rx_mgtdiscard++; 1942 return; 1943 } 1944 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1945 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1946 wh, NULL, "%s", "wrong bssid"); 1947 vap->iv_stats.is_rx_assoc_bss++; 1948 return; 1949 } 1950 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1951 reassoc = 1; 1952 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1953 } else { 1954 reassoc = 0; 1955 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1956 } 1957 if (ni == vap->iv_bss) { 1958 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1959 "deny %s request, sta not authenticated", 1960 reassoc ? "reassoc" : "assoc"); 1961 ieee80211_send_error(ni, wh->i_addr2, 1962 IEEE80211_FC0_SUBTYPE_DEAUTH, 1963 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1964 vap->iv_stats.is_rx_assoc_notauth++; 1965 return; 1966 } 1967 1968 /* 1969 * asreq frame format 1970 * [2] capability information 1971 * [2] listen interval 1972 * [6*] current AP address (reassoc only) 1973 * [tlv] ssid 1974 * [tlv] supported rates 1975 * [tlv] extended supported rates 1976 * [tlv] WPA or RSN 1977 * [tlv] HT capabilities 1978 * [tlv] Atheros capabilities 1979 */ 1980 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1981 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1982 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1983 if (reassoc) 1984 frm += 6; /* ignore current AP info */ 1985 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1986 sfrm = frm; 1987 while (efrm - frm > 1) { 1988 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1989 switch (*frm) { 1990 case IEEE80211_ELEMID_SSID: 1991 ssid = frm; 1992 break; 1993 case IEEE80211_ELEMID_RATES: 1994 rates = frm; 1995 break; 1996 case IEEE80211_ELEMID_XRATES: 1997 xrates = frm; 1998 break; 1999 case IEEE80211_ELEMID_RSN: 2000 rsn = frm; 2001 break; 2002 case IEEE80211_ELEMID_HTCAP: 2003 htcap = frm; 2004 break; 2005 case IEEE80211_ELEMID_VENDOR: 2006 if (iswpaoui(frm)) 2007 wpa = frm; 2008 else if (iswmeinfo(frm)) 2009 wme = frm; 2010 #ifdef IEEE80211_SUPPORT_SUPERG 2011 else if (isatherosoui(frm)) 2012 ath = frm; 2013 #endif 2014 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 2015 if (ishtcapoui(frm) && htcap == NULL) 2016 htcap = frm; 2017 } 2018 break; 2019 } 2020 frm += frm[1] + 2; 2021 } 2022 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2023 if (xrates != NULL) 2024 IEEE80211_VERIFY_ELEMENT(xrates, 2025 IEEE80211_RATE_MAXSIZE - rates[1], return); 2026 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2027 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2028 if (htcap != NULL) { 2029 IEEE80211_VERIFY_LENGTH(htcap[1], 2030 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2031 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2032 sizeof(struct ieee80211_ie_htcap)-2, 2033 return); /* XXX just NULL out? */ 2034 } 2035 2036 if ((vap->iv_flags & IEEE80211_F_WPA) && 2037 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2038 return; 2039 /* discard challenge after association */ 2040 if (ni->ni_challenge != NULL) { 2041 free(ni->ni_challenge, M_80211_NODE); 2042 ni->ni_challenge = NULL; 2043 } 2044 /* NB: 802.11 spec says to ignore station's privacy bit */ 2045 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2046 capinfomismatch(ni, wh, reassoc, resp, 2047 "capability", capinfo); 2048 return; 2049 } 2050 /* 2051 * Disallow re-associate w/ invalid slot time setting. 2052 */ 2053 if (ni->ni_associd != 0 && 2054 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2055 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2056 capinfomismatch(ni, wh, reassoc, resp, 2057 "slot time", capinfo); 2058 return; 2059 } 2060 rate = ieee80211_setup_rates(ni, rates, xrates, 2061 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2062 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2063 if (rate & IEEE80211_RATE_BASIC) { 2064 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2065 vap->iv_stats.is_rx_assoc_norate++; 2066 return; 2067 } 2068 /* 2069 * If constrained to 11g-only stations reject an 2070 * 11b-only station. We cheat a bit here by looking 2071 * at the max negotiated xmit rate and assuming anyone 2072 * with a best rate <24Mb/s is an 11b station. 2073 */ 2074 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2075 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2076 vap->iv_stats.is_rx_assoc_norate++; 2077 return; 2078 } 2079 /* 2080 * Do HT rate set handling and setup HT node state. 2081 */ 2082 ni->ni_chan = vap->iv_bss->ni_chan; 2083 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2084 rate = ieee80211_setup_htrates(ni, htcap, 2085 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2086 IEEE80211_F_DOBRS); 2087 if (rate & IEEE80211_RATE_BASIC) { 2088 ratesetmismatch(ni, wh, reassoc, resp, 2089 "HT", rate); 2090 vap->iv_stats.is_ht_assoc_norate++; 2091 return; 2092 } 2093 ieee80211_ht_node_init(ni); 2094 ieee80211_ht_updatehtcap(ni, htcap); 2095 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2096 ieee80211_ht_node_cleanup(ni); 2097 #ifdef IEEE80211_SUPPORT_SUPERG 2098 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2099 ieee80211_ff_node_cleanup(ni); 2100 #endif 2101 /* 2102 * Allow AMPDU operation only with unencrypted traffic 2103 * or AES-CCM; the 11n spec only specifies these ciphers 2104 * so permitting any others is undefined and can lead 2105 * to interoperability problems. 2106 */ 2107 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2108 (((vap->iv_flags & IEEE80211_F_WPA) && 2109 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2110 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2111 IEEE80211_NOTE(vap, 2112 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2113 "disallow HT use because WEP or TKIP requested, " 2114 "capinfo 0x%x ucastcipher %d", capinfo, 2115 rsnparms.rsn_ucastcipher); 2116 ieee80211_ht_node_cleanup(ni); 2117 vap->iv_stats.is_ht_assoc_downgrade++; 2118 } 2119 /* 2120 * If constrained to 11n-only stations reject legacy stations. 2121 */ 2122 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2123 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2124 htcapmismatch(ni, wh, reassoc, resp); 2125 vap->iv_stats.is_ht_assoc_nohtcap++; 2126 return; 2127 } 2128 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2129 ni->ni_noise = nf; 2130 ni->ni_intval = lintval; 2131 ni->ni_capinfo = capinfo; 2132 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2133 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2134 /* 2135 * Store the IEs. 2136 * XXX maybe better to just expand 2137 */ 2138 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2139 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2140 if (wpa != NULL) 2141 setie(wpa_ie, wpa - sfrm); 2142 if (rsn != NULL) 2143 setie(rsn_ie, rsn - sfrm); 2144 if (htcap != NULL) 2145 setie(htcap_ie, htcap - sfrm); 2146 if (wme != NULL) { 2147 setie(wme_ie, wme - sfrm); 2148 /* 2149 * Mark node as capable of QoS. 2150 */ 2151 ni->ni_flags |= IEEE80211_NODE_QOS; 2152 } else 2153 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2154 #ifdef IEEE80211_SUPPORT_SUPERG 2155 if (ath != NULL) { 2156 setie(ath_ie, ath - sfrm); 2157 /* 2158 * Parse ATH station parameters. 2159 */ 2160 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2161 } else 2162 #endif 2163 ni->ni_ath_flags = 0; 2164 #undef setie 2165 } else { 2166 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2167 ni->ni_ath_flags = 0; 2168 } 2169 ieee80211_node_join(ni, resp); 2170 ieee80211_deliver_l2uf(ni); 2171 break; 2172 } 2173 2174 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2175 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2176 uint16_t reason; 2177 2178 if (vap->iv_state != IEEE80211_S_RUN || 2179 /* NB: can happen when in promiscuous mode */ 2180 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2181 vap->iv_stats.is_rx_mgtdiscard++; 2182 break; 2183 } 2184 /* 2185 * deauth/disassoc frame format 2186 * [2] reason 2187 */ 2188 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2189 reason = le16toh(*(uint16_t *)frm); 2190 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2191 vap->iv_stats.is_rx_deauth++; 2192 IEEE80211_NODE_STAT(ni, rx_deauth); 2193 } else { 2194 vap->iv_stats.is_rx_disassoc++; 2195 IEEE80211_NODE_STAT(ni, rx_disassoc); 2196 } 2197 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2198 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2199 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2200 if (ni != vap->iv_bss) 2201 ieee80211_node_leave(ni); 2202 break; 2203 } 2204 2205 case IEEE80211_FC0_SUBTYPE_ACTION: 2206 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2207 if (ni == vap->iv_bss) { 2208 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2209 wh, NULL, "%s", "unknown node"); 2210 vap->iv_stats.is_rx_mgtdiscard++; 2211 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2212 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2213 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2214 wh, NULL, "%s", "not for us"); 2215 vap->iv_stats.is_rx_mgtdiscard++; 2216 } else if (vap->iv_state != IEEE80211_S_RUN) { 2217 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2218 wh, NULL, "wrong state %s", 2219 ieee80211_state_name[vap->iv_state]); 2220 vap->iv_stats.is_rx_mgtdiscard++; 2221 } else { 2222 if (ieee80211_parse_action(ni, m0) == 0) 2223 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2224 } 2225 break; 2226 2227 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2228 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2229 case IEEE80211_FC0_SUBTYPE_ATIM: 2230 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2231 wh, NULL, "%s", "not handled"); 2232 vap->iv_stats.is_rx_mgtdiscard++; 2233 break; 2234 2235 default: 2236 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2237 wh, "mgt", "subtype 0x%x not handled", subtype); 2238 vap->iv_stats.is_rx_badsubtype++; 2239 break; 2240 } 2241 } 2242 2243 static void 2244 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2245 { 2246 switch (subtype) { 2247 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2248 ni->ni_vap->iv_recv_pspoll(ni, m); 2249 break; 2250 case IEEE80211_FC0_SUBTYPE_BAR: 2251 ieee80211_recv_bar(ni, m); 2252 break; 2253 } 2254 } 2255 2256 /* 2257 * Process a received ps-poll frame. 2258 */ 2259 void 2260 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2261 { 2262 struct ieee80211vap *vap = ni->ni_vap; 2263 struct ieee80211com *ic = vap->iv_ic; 2264 struct ieee80211_frame_min *wh; 2265 struct mbuf *m; 2266 uint16_t aid; 2267 int qlen; 2268 2269 wh = mtod(m0, struct ieee80211_frame_min *); 2270 if (ni->ni_associd == 0) { 2271 IEEE80211_DISCARD(vap, 2272 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2273 (struct ieee80211_frame *) wh, NULL, 2274 "%s", "unassociated station"); 2275 vap->iv_stats.is_ps_unassoc++; 2276 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2277 IEEE80211_REASON_NOT_ASSOCED); 2278 return; 2279 } 2280 2281 aid = le16toh(*(uint16_t *)wh->i_dur); 2282 if (aid != ni->ni_associd) { 2283 IEEE80211_DISCARD(vap, 2284 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2285 (struct ieee80211_frame *) wh, NULL, 2286 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2287 ni->ni_associd, aid); 2288 vap->iv_stats.is_ps_badaid++; 2289 /* 2290 * NB: We used to deauth the station but it turns out 2291 * the Blackberry Curve 8230 (and perhaps other devices) 2292 * sometimes send the wrong AID when WME is negotiated. 2293 * Being more lenient here seems ok as we already check 2294 * the station is associated and we only return frames 2295 * queued for the station (i.e. we don't use the AID). 2296 */ 2297 return; 2298 } 2299 2300 /* Okay, take the first queued packet and put it out... */ 2301 m = ieee80211_node_psq_dequeue(ni, &qlen); 2302 if (m == NULL) { 2303 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2304 "%s", "recv ps-poll, but queue empty"); 2305 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2306 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2307 if (vap->iv_set_tim != NULL) 2308 vap->iv_set_tim(ni, 0); /* just in case */ 2309 return; 2310 } 2311 /* 2312 * If there are more packets, set the more packets bit 2313 * in the packet dispatched to the station; otherwise 2314 * turn off the TIM bit. 2315 */ 2316 if (qlen != 0) { 2317 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2318 "recv ps-poll, send packet, %u still queued", qlen); 2319 m->m_flags |= M_MORE_DATA; 2320 } else { 2321 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2322 "%s", "recv ps-poll, send packet, queue empty"); 2323 if (vap->iv_set_tim != NULL) 2324 vap->iv_set_tim(ni, 0); 2325 } 2326 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2327 2328 /* 2329 * Do the right thing; if it's an encap'ed frame then 2330 * call ieee80211_parent_xmitpkt() (and free the ref) else 2331 * call ieee80211_vap_xmitpkt(). 2332 */ 2333 if (m->m_flags & M_ENCAP) { 2334 if (ieee80211_parent_xmitpkt(ic, m) != 0) 2335 ieee80211_free_node(ni); 2336 } else { 2337 (void) ieee80211_vap_xmitpkt(vap, m); 2338 } 2339 } 2340