ieee80211_hostap.c revision 205516
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: head/sys/net80211/ieee80211_hostap.c 205516 2010-03-23 14:31:31Z rpaulo $"); 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 67static void hostap_vattach(struct ieee80211vap *); 68static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int); 69static int hostap_input(struct ieee80211_node *ni, struct mbuf *m, 70 int rssi, int nf); 71static void hostap_deliver_data(struct ieee80211vap *, 72 struct ieee80211_node *, struct mbuf *); 73static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 74 int subtype, int rssi, int nf); 75static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int); 76static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *); 77 78void 79ieee80211_hostap_attach(struct ieee80211com *ic) 80{ 81 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach; 82} 83 84void 85ieee80211_hostap_detach(struct ieee80211com *ic) 86{ 87} 88 89static void 90hostap_vdetach(struct ieee80211vap *vap) 91{ 92} 93 94static void 95hostap_vattach(struct ieee80211vap *vap) 96{ 97 vap->iv_newstate = hostap_newstate; 98 vap->iv_input = hostap_input; 99 vap->iv_recv_mgmt = hostap_recv_mgmt; 100 vap->iv_recv_ctl = hostap_recv_ctl; 101 vap->iv_opdetach = hostap_vdetach; 102 vap->iv_deliver_data = hostap_deliver_data; 103} 104 105static void 106sta_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 117static void 118sta_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 130static void 131sta_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 */ 144static int 145isbandchange(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 */ 155static int 156hostap_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 350static void 351hostap_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 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST); 359 360 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 361 ("gack, opmode %d", vap->iv_opmode)); 362 /* 363 * Do accounting. 364 */ 365 ifp->if_ipackets++; 366 IEEE80211_NODE_STAT(ni, rx_data); 367 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 368 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 369 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 370 IEEE80211_NODE_STAT(ni, rx_mcast); 371 } else 372 IEEE80211_NODE_STAT(ni, rx_ucast); 373 374 /* perform as a bridge within the AP */ 375 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 376 struct mbuf *mcopy = NULL; 377 378 if (m->m_flags & M_MCAST) { 379 mcopy = m_dup(m, M_DONTWAIT); 380 if (mcopy == NULL) 381 ifp->if_oerrors++; 382 else 383 mcopy->m_flags |= M_MCAST; 384 } else { 385 /* 386 * Check if the destination is associated with the 387 * same vap and authorized to receive traffic. 388 * Beware of traffic destined for the vap itself; 389 * sending it will not work; just let it be delivered 390 * normally. 391 */ 392 struct ieee80211_node *sta = ieee80211_find_vap_node( 393 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 394 if (sta != NULL) { 395 if (ieee80211_node_is_authorized(sta)) { 396 /* 397 * Beware of sending to ourself; this 398 * needs to happen via the normal 399 * input path. 400 */ 401 if (sta != vap->iv_bss) { 402 mcopy = m; 403 m = NULL; 404 } 405 } else { 406 vap->iv_stats.is_rx_unauth++; 407 IEEE80211_NODE_STAT(sta, rx_unauth); 408 } 409 ieee80211_free_node(sta); 410 } 411 } 412 if (mcopy != NULL) { 413 int len, err; 414 len = mcopy->m_pkthdr.len; 415 err = ifp->if_transmit(ifp, mcopy); 416 if (err) { 417 /* NB: IFQ_HANDOFF reclaims mcopy */ 418 } else { 419 ifp->if_opackets++; 420 } 421 } 422 } 423 if (m != NULL) { 424 /* 425 * Mark frame as coming from vap's interface. 426 */ 427 m->m_pkthdr.rcvif = ifp; 428 if (m->m_flags & M_MCAST) { 429 /* 430 * Spam DWDS vap's w/ multicast traffic. 431 */ 432 /* XXX only if dwds in use? */ 433 ieee80211_dwds_mcast(vap, m); 434 } 435 if (ni->ni_vlan != 0) { 436 /* attach vlan tag */ 437 m->m_pkthdr.ether_vtag = ni->ni_vlan; 438 m->m_flags |= M_VLANTAG; 439 } 440 ifp->if_input(ifp, m); 441 } 442} 443 444/* 445 * Decide if a received management frame should be 446 * printed when debugging is enabled. This filters some 447 * of the less interesting frames that come frequently 448 * (e.g. beacons). 449 */ 450static __inline int 451doprint(struct ieee80211vap *vap, int subtype) 452{ 453 switch (subtype) { 454 case IEEE80211_FC0_SUBTYPE_BEACON: 455 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 456 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 457 return 0; 458 } 459 return 1; 460} 461 462/* 463 * Process a received frame. The node associated with the sender 464 * should be supplied. If nothing was found in the node table then 465 * the caller is assumed to supply a reference to iv_bss instead. 466 * The RSSI and a timestamp are also supplied. The RSSI data is used 467 * during AP scanning to select a AP to associate with; it can have 468 * any units so long as values have consistent units and higher values 469 * mean ``better signal''. The receive timestamp is currently not used 470 * by the 802.11 layer. 471 */ 472static int 473hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 474{ 475#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 476#define HAS_SEQ(type) ((type & 0x4) == 0) 477 struct ieee80211vap *vap = ni->ni_vap; 478 struct ieee80211com *ic = ni->ni_ic; 479 struct ifnet *ifp = vap->iv_ifp; 480 struct ieee80211_frame *wh; 481 struct ieee80211_key *key; 482 struct ether_header *eh; 483 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 484 uint8_t dir, type, subtype, qos; 485 uint8_t *bssid; 486 uint16_t rxseq; 487 488 if (m->m_flags & M_AMPDU_MPDU) { 489 /* 490 * Fastpath for A-MPDU reorder q resubmission. Frames 491 * w/ M_AMPDU_MPDU marked have already passed through 492 * here but were received out of order and been held on 493 * the reorder queue. When resubmitted they are marked 494 * with the M_AMPDU_MPDU flag and we can bypass most of 495 * the normal processing. 496 */ 497 wh = mtod(m, struct ieee80211_frame *); 498 type = IEEE80211_FC0_TYPE_DATA; 499 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 500 subtype = IEEE80211_FC0_SUBTYPE_QOS; 501 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 502 goto resubmit_ampdu; 503 } 504 505 KASSERT(ni != NULL, ("null node")); 506 ni->ni_inact = ni->ni_inact_reload; 507 508 type = -1; /* undefined */ 509 510 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 511 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 512 ni->ni_macaddr, NULL, 513 "too short (1): len %u", m->m_pkthdr.len); 514 vap->iv_stats.is_rx_tooshort++; 515 goto out; 516 } 517 /* 518 * Bit of a cheat here, we use a pointer for a 3-address 519 * frame format but don't reference fields past outside 520 * ieee80211_frame_min w/o first validating the data is 521 * present. 522 */ 523 wh = mtod(m, struct ieee80211_frame *); 524 525 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 526 IEEE80211_FC0_VERSION_0) { 527 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 528 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 529 wh->i_fc[0], wh->i_fc[1]); 530 vap->iv_stats.is_rx_badversion++; 531 goto err; 532 } 533 534 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 535 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 536 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 537 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 538 if (dir != IEEE80211_FC1_DIR_NODS) 539 bssid = wh->i_addr1; 540 else if (type == IEEE80211_FC0_TYPE_CTL) 541 bssid = wh->i_addr1; 542 else { 543 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 544 IEEE80211_DISCARD_MAC(vap, 545 IEEE80211_MSG_ANY, ni->ni_macaddr, 546 NULL, "too short (2): len %u", 547 m->m_pkthdr.len); 548 vap->iv_stats.is_rx_tooshort++; 549 goto out; 550 } 551 bssid = wh->i_addr3; 552 } 553 /* 554 * Validate the bssid. 555 */ 556 if (!(type == IEEE80211_FC0_TYPE_MGT && 557 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 558 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 559 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 560 /* not interested in */ 561 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 562 bssid, NULL, "%s", "not to bss"); 563 vap->iv_stats.is_rx_wrongbss++; 564 goto out; 565 } 566 567 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 568 ni->ni_noise = nf; 569 if (HAS_SEQ(type)) { 570 uint8_t tid = ieee80211_gettid(wh); 571 if (IEEE80211_QOS_HAS_SEQ(wh) && 572 TID_TO_WME_AC(tid) >= WME_AC_VI) 573 ic->ic_wme.wme_hipri_traffic++; 574 rxseq = le16toh(*(uint16_t *)wh->i_seq); 575 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 576 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 577 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 578 /* duplicate, discard */ 579 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 580 bssid, "duplicate", 581 "seqno <%u,%u> fragno <%u,%u> tid %u", 582 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 583 ni->ni_rxseqs[tid] >> 584 IEEE80211_SEQ_SEQ_SHIFT, 585 rxseq & IEEE80211_SEQ_FRAG_MASK, 586 ni->ni_rxseqs[tid] & 587 IEEE80211_SEQ_FRAG_MASK, 588 tid); 589 vap->iv_stats.is_rx_dup++; 590 IEEE80211_NODE_STAT(ni, rx_dup); 591 goto out; 592 } 593 ni->ni_rxseqs[tid] = rxseq; 594 } 595 } 596 597 switch (type) { 598 case IEEE80211_FC0_TYPE_DATA: 599 hdrspace = ieee80211_hdrspace(ic, wh); 600 if (m->m_len < hdrspace && 601 (m = m_pullup(m, hdrspace)) == NULL) { 602 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 603 ni->ni_macaddr, NULL, 604 "data too short: expecting %u", hdrspace); 605 vap->iv_stats.is_rx_tooshort++; 606 goto out; /* XXX */ 607 } 608 if (!(dir == IEEE80211_FC1_DIR_TODS || 609 (dir == IEEE80211_FC1_DIR_DSTODS && 610 (vap->iv_flags & IEEE80211_F_DWDS)))) { 611 if (dir != IEEE80211_FC1_DIR_DSTODS) { 612 IEEE80211_DISCARD(vap, 613 IEEE80211_MSG_INPUT, wh, "data", 614 "incorrect dir 0x%x", dir); 615 } else { 616 IEEE80211_DISCARD(vap, 617 IEEE80211_MSG_INPUT | 618 IEEE80211_MSG_WDS, wh, 619 "4-address data", 620 "%s", "DWDS not enabled"); 621 } 622 vap->iv_stats.is_rx_wrongdir++; 623 goto out; 624 } 625 /* check if source STA is associated */ 626 if (ni == vap->iv_bss) { 627 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 628 wh, "data", "%s", "unknown src"); 629 ieee80211_send_error(ni, wh->i_addr2, 630 IEEE80211_FC0_SUBTYPE_DEAUTH, 631 IEEE80211_REASON_NOT_AUTHED); 632 vap->iv_stats.is_rx_notassoc++; 633 goto err; 634 } 635 if (ni->ni_associd == 0) { 636 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 637 wh, "data", "%s", "unassoc src"); 638 IEEE80211_SEND_MGMT(ni, 639 IEEE80211_FC0_SUBTYPE_DISASSOC, 640 IEEE80211_REASON_NOT_ASSOCED); 641 vap->iv_stats.is_rx_notassoc++; 642 goto err; 643 } 644 645 /* 646 * Check for power save state change. 647 * XXX out-of-order A-MPDU frames? 648 */ 649 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 650 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 651 ieee80211_node_pwrsave(ni, 652 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 653 /* 654 * For 4-address packets handle WDS discovery 655 * notifications. Once a WDS link is setup frames 656 * are just delivered to the WDS vap (see below). 657 */ 658 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 659 if (!ieee80211_node_is_authorized(ni)) { 660 IEEE80211_DISCARD(vap, 661 IEEE80211_MSG_INPUT | 662 IEEE80211_MSG_WDS, wh, 663 "4-address data", 664 "%s", "unauthorized port"); 665 vap->iv_stats.is_rx_unauth++; 666 IEEE80211_NODE_STAT(ni, rx_unauth); 667 goto err; 668 } 669 ieee80211_dwds_discover(ni, m); 670 return type; 671 } 672 673 /* 674 * Handle A-MPDU re-ordering. If the frame is to be 675 * processed directly then ieee80211_ampdu_reorder 676 * will return 0; otherwise it has consumed the mbuf 677 * and we should do nothing more with it. 678 */ 679 if ((m->m_flags & M_AMPDU) && 680 ieee80211_ampdu_reorder(ni, m) != 0) { 681 m = NULL; 682 goto out; 683 } 684 resubmit_ampdu: 685 686 /* 687 * Handle privacy requirements. Note that we 688 * must not be preempted from here until after 689 * we (potentially) call ieee80211_crypto_demic; 690 * otherwise we may violate assumptions in the 691 * crypto cipher modules used to do delayed update 692 * of replay sequence numbers. 693 */ 694 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 695 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 696 /* 697 * Discard encrypted frames when privacy is off. 698 */ 699 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 700 wh, "WEP", "%s", "PRIVACY off"); 701 vap->iv_stats.is_rx_noprivacy++; 702 IEEE80211_NODE_STAT(ni, rx_noprivacy); 703 goto out; 704 } 705 key = ieee80211_crypto_decap(ni, m, hdrspace); 706 if (key == NULL) { 707 /* NB: stats+msgs handled in crypto_decap */ 708 IEEE80211_NODE_STAT(ni, rx_wepfail); 709 goto out; 710 } 711 wh = mtod(m, struct ieee80211_frame *); 712 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 713 } else { 714 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 715 key = NULL; 716 } 717 718 /* 719 * Save QoS bits for use below--before we strip the header. 720 */ 721 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 722 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 723 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 724 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 725 } else 726 qos = 0; 727 728 /* 729 * Next up, any fragmentation. 730 */ 731 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 732 m = ieee80211_defrag(ni, m, hdrspace); 733 if (m == NULL) { 734 /* Fragment dropped or frame not complete yet */ 735 goto out; 736 } 737 } 738 wh = NULL; /* no longer valid, catch any uses */ 739 740 /* 741 * Next strip any MSDU crypto bits. 742 */ 743 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 744 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 745 ni->ni_macaddr, "data", "%s", "demic error"); 746 vap->iv_stats.is_rx_demicfail++; 747 IEEE80211_NODE_STAT(ni, rx_demicfail); 748 goto out; 749 } 750 /* copy to listener after decrypt */ 751 if (ieee80211_radiotap_active_vap(vap)) 752 ieee80211_radiotap_rx(vap, m); 753 need_tap = 0; 754 /* 755 * Finally, strip the 802.11 header. 756 */ 757 m = ieee80211_decap(vap, m, hdrspace); 758 if (m == NULL) { 759 /* XXX mask bit to check for both */ 760 /* don't count Null data frames as errors */ 761 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 762 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 763 goto out; 764 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 765 ni->ni_macaddr, "data", "%s", "decap error"); 766 vap->iv_stats.is_rx_decap++; 767 IEEE80211_NODE_STAT(ni, rx_decap); 768 goto err; 769 } 770 eh = mtod(m, struct ether_header *); 771 if (!ieee80211_node_is_authorized(ni)) { 772 /* 773 * Deny any non-PAE frames received prior to 774 * authorization. For open/shared-key 775 * authentication the port is mark authorized 776 * after authentication completes. For 802.1x 777 * the port is not marked authorized by the 778 * authenticator until the handshake has completed. 779 */ 780 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 781 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 782 eh->ether_shost, "data", 783 "unauthorized port: ether type 0x%x len %u", 784 eh->ether_type, m->m_pkthdr.len); 785 vap->iv_stats.is_rx_unauth++; 786 IEEE80211_NODE_STAT(ni, rx_unauth); 787 goto err; 788 } 789 } else { 790 /* 791 * When denying unencrypted frames, discard 792 * any non-PAE frames received without encryption. 793 */ 794 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 795 (key == NULL && (m->m_flags & M_WEP) == 0) && 796 eh->ether_type != htons(ETHERTYPE_PAE)) { 797 /* 798 * Drop unencrypted frames. 799 */ 800 vap->iv_stats.is_rx_unencrypted++; 801 IEEE80211_NODE_STAT(ni, rx_unencrypted); 802 goto out; 803 } 804 } 805 /* XXX require HT? */ 806 if (qos & IEEE80211_QOS_AMSDU) { 807 m = ieee80211_decap_amsdu(ni, m); 808 if (m == NULL) 809 return IEEE80211_FC0_TYPE_DATA; 810 } else { 811#ifdef IEEE80211_SUPPORT_SUPERG 812 m = ieee80211_decap_fastframe(vap, ni, m); 813 if (m == NULL) 814 return IEEE80211_FC0_TYPE_DATA; 815#endif 816 } 817 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 818 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 819 else 820 hostap_deliver_data(vap, ni, m); 821 return IEEE80211_FC0_TYPE_DATA; 822 823 case IEEE80211_FC0_TYPE_MGT: 824 vap->iv_stats.is_rx_mgmt++; 825 IEEE80211_NODE_STAT(ni, rx_mgmt); 826 if (dir != IEEE80211_FC1_DIR_NODS) { 827 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 828 wh, "mgt", "incorrect dir 0x%x", dir); 829 vap->iv_stats.is_rx_wrongdir++; 830 goto err; 831 } 832 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 833 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 834 ni->ni_macaddr, "mgt", "too short: len %u", 835 m->m_pkthdr.len); 836 vap->iv_stats.is_rx_tooshort++; 837 goto out; 838 } 839 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 840 /* ensure return frames are unicast */ 841 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 842 wh, NULL, "source is multicast: %s", 843 ether_sprintf(wh->i_addr2)); 844 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 845 goto out; 846 } 847#ifdef IEEE80211_DEBUG 848 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 849 ieee80211_msg_dumppkts(vap)) { 850 if_printf(ifp, "received %s from %s rssi %d\n", 851 ieee80211_mgt_subtype_name[subtype >> 852 IEEE80211_FC0_SUBTYPE_SHIFT], 853 ether_sprintf(wh->i_addr2), rssi); 854 } 855#endif 856 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 857 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 858 /* 859 * Only shared key auth frames with a challenge 860 * should be encrypted, discard all others. 861 */ 862 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 863 wh, NULL, 864 "%s", "WEP set but not permitted"); 865 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 866 goto out; 867 } 868 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 869 /* 870 * Discard encrypted frames when privacy is off. 871 */ 872 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 873 wh, NULL, "%s", "WEP set but PRIVACY off"); 874 vap->iv_stats.is_rx_noprivacy++; 875 goto out; 876 } 877 hdrspace = ieee80211_hdrspace(ic, wh); 878 key = ieee80211_crypto_decap(ni, m, hdrspace); 879 if (key == NULL) { 880 /* NB: stats+msgs handled in crypto_decap */ 881 goto out; 882 } 883 wh = mtod(m, struct ieee80211_frame *); 884 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 885 } 886 if (ieee80211_radiotap_active_vap(vap)) 887 ieee80211_radiotap_rx(vap, m); 888 need_tap = 0; 889 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 890 goto out; 891 892 case IEEE80211_FC0_TYPE_CTL: 893 vap->iv_stats.is_rx_ctl++; 894 IEEE80211_NODE_STAT(ni, rx_ctrl); 895 vap->iv_recv_ctl(ni, m, subtype); 896 goto out; 897 default: 898 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 899 wh, "bad", "frame type 0x%x", type); 900 /* should not come here */ 901 break; 902 } 903err: 904 ifp->if_ierrors++; 905out: 906 if (m != NULL) { 907 if (need_tap && ieee80211_radiotap_active_vap(vap)) 908 ieee80211_radiotap_rx(vap, m); 909 m_freem(m); 910 } 911 return type; 912#undef SEQ_LEQ 913} 914 915static void 916hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 917 int rssi, int nf, uint16_t seq, uint16_t status) 918{ 919 struct ieee80211vap *vap = ni->ni_vap; 920 921 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 922 923 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 924 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 925 ni->ni_macaddr, "open auth", 926 "bad sta auth mode %u", ni->ni_authmode); 927 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 928 /* 929 * Clear any challenge text that may be there if 930 * a previous shared key auth failed and then an 931 * open auth is attempted. 932 */ 933 if (ni->ni_challenge != NULL) { 934 free(ni->ni_challenge, M_80211_NODE); 935 ni->ni_challenge = NULL; 936 } 937 /* XXX hack to workaround calling convention */ 938 ieee80211_send_error(ni, wh->i_addr2, 939 IEEE80211_FC0_SUBTYPE_AUTH, 940 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 941 return; 942 } 943 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 944 vap->iv_stats.is_rx_bad_auth++; 945 return; 946 } 947 /* always accept open authentication requests */ 948 if (ni == vap->iv_bss) { 949 ni = ieee80211_dup_bss(vap, wh->i_addr2); 950 if (ni == NULL) 951 return; 952 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 953 (void) ieee80211_ref_node(ni); 954 /* 955 * Mark the node as referenced to reflect that it's 956 * reference count has been bumped to insure it remains 957 * after the transaction completes. 958 */ 959 ni->ni_flags |= IEEE80211_NODE_AREF; 960 /* 961 * Mark the node as requiring a valid association id 962 * before outbound traffic is permitted. 963 */ 964 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 965 966 if (vap->iv_acl != NULL && 967 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 968 /* 969 * When the ACL policy is set to RADIUS we defer the 970 * authorization to a user agent. Dispatch an event, 971 * a subsequent MLME call will decide the fate of the 972 * station. If the user agent is not present then the 973 * node will be reclaimed due to inactivity. 974 */ 975 IEEE80211_NOTE_MAC(vap, 976 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 977 "%s", "station authentication defered (radius acl)"); 978 ieee80211_notify_node_auth(ni); 979 } else { 980 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 981 IEEE80211_NOTE_MAC(vap, 982 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 983 "%s", "station authenticated (open)"); 984 /* 985 * When 802.1x is not in use mark the port 986 * authorized at this point so traffic can flow. 987 */ 988 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 989 ieee80211_node_authorize(ni); 990 } 991} 992 993static void 994hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 995 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 996 uint16_t seq, uint16_t status) 997{ 998 struct ieee80211vap *vap = ni->ni_vap; 999 uint8_t *challenge; 1000 int allocbs, estatus; 1001 1002 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 1003 1004 /* 1005 * NB: this can happen as we allow pre-shared key 1006 * authentication to be enabled w/o wep being turned 1007 * on so that configuration of these can be done 1008 * in any order. It may be better to enforce the 1009 * ordering in which case this check would just be 1010 * for sanity/consistency. 1011 */ 1012 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1013 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1014 ni->ni_macaddr, "shared key auth", 1015 "%s", " PRIVACY is disabled"); 1016 estatus = IEEE80211_STATUS_ALG; 1017 goto bad; 1018 } 1019 /* 1020 * Pre-shared key authentication is evil; accept 1021 * it only if explicitly configured (it is supported 1022 * mainly for compatibility with clients like Mac OS X). 1023 */ 1024 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1025 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1026 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1027 ni->ni_macaddr, "shared key auth", 1028 "bad sta auth mode %u", ni->ni_authmode); 1029 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1030 estatus = IEEE80211_STATUS_ALG; 1031 goto bad; 1032 } 1033 1034 challenge = NULL; 1035 if (frm + 1 < efrm) { 1036 if ((frm[1] + 2) > (efrm - frm)) { 1037 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1038 ni->ni_macaddr, "shared key auth", 1039 "ie %d/%d too long", 1040 frm[0], (frm[1] + 2) - (efrm - frm)); 1041 vap->iv_stats.is_rx_bad_auth++; 1042 estatus = IEEE80211_STATUS_CHALLENGE; 1043 goto bad; 1044 } 1045 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1046 challenge = frm; 1047 frm += frm[1] + 2; 1048 } 1049 switch (seq) { 1050 case IEEE80211_AUTH_SHARED_CHALLENGE: 1051 case IEEE80211_AUTH_SHARED_RESPONSE: 1052 if (challenge == NULL) { 1053 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1054 ni->ni_macaddr, "shared key auth", 1055 "%s", "no challenge"); 1056 vap->iv_stats.is_rx_bad_auth++; 1057 estatus = IEEE80211_STATUS_CHALLENGE; 1058 goto bad; 1059 } 1060 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1061 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1062 ni->ni_macaddr, "shared key auth", 1063 "bad challenge len %d", challenge[1]); 1064 vap->iv_stats.is_rx_bad_auth++; 1065 estatus = IEEE80211_STATUS_CHALLENGE; 1066 goto bad; 1067 } 1068 default: 1069 break; 1070 } 1071 switch (seq) { 1072 case IEEE80211_AUTH_SHARED_REQUEST: 1073 if (ni == vap->iv_bss) { 1074 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1075 if (ni == NULL) { 1076 /* NB: no way to return an error */ 1077 return; 1078 } 1079 allocbs = 1; 1080 } else { 1081 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1082 (void) ieee80211_ref_node(ni); 1083 allocbs = 0; 1084 } 1085 /* 1086 * Mark the node as referenced to reflect that it's 1087 * reference count has been bumped to insure it remains 1088 * after the transaction completes. 1089 */ 1090 ni->ni_flags |= IEEE80211_NODE_AREF; 1091 /* 1092 * Mark the node as requiring a valid associatio id 1093 * before outbound traffic is permitted. 1094 */ 1095 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1096 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1097 ni->ni_noise = nf; 1098 if (!ieee80211_alloc_challenge(ni)) { 1099 /* NB: don't return error so they rexmit */ 1100 return; 1101 } 1102 get_random_bytes(ni->ni_challenge, 1103 IEEE80211_CHALLENGE_LEN); 1104 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1105 ni, "shared key %sauth request", allocbs ? "" : "re"); 1106 /* 1107 * When the ACL policy is set to RADIUS we defer the 1108 * authorization to a user agent. Dispatch an event, 1109 * a subsequent MLME call will decide the fate of the 1110 * station. If the user agent is not present then the 1111 * node will be reclaimed due to inactivity. 1112 */ 1113 if (vap->iv_acl != NULL && 1114 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1115 IEEE80211_NOTE_MAC(vap, 1116 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1117 ni->ni_macaddr, 1118 "%s", "station authentication defered (radius acl)"); 1119 ieee80211_notify_node_auth(ni); 1120 return; 1121 } 1122 break; 1123 case IEEE80211_AUTH_SHARED_RESPONSE: 1124 if (ni == vap->iv_bss) { 1125 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1126 ni->ni_macaddr, "shared key response", 1127 "%s", "unknown station"); 1128 /* NB: don't send a response */ 1129 return; 1130 } 1131 if (ni->ni_challenge == NULL) { 1132 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1133 ni->ni_macaddr, "shared key response", 1134 "%s", "no challenge recorded"); 1135 vap->iv_stats.is_rx_bad_auth++; 1136 estatus = IEEE80211_STATUS_CHALLENGE; 1137 goto bad; 1138 } 1139 if (memcmp(ni->ni_challenge, &challenge[2], 1140 challenge[1]) != 0) { 1141 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1142 ni->ni_macaddr, "shared key response", 1143 "%s", "challenge mismatch"); 1144 vap->iv_stats.is_rx_auth_fail++; 1145 estatus = IEEE80211_STATUS_CHALLENGE; 1146 goto bad; 1147 } 1148 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1149 ni, "%s", "station authenticated (shared key)"); 1150 ieee80211_node_authorize(ni); 1151 break; 1152 default: 1153 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1154 ni->ni_macaddr, "shared key auth", 1155 "bad seq %d", seq); 1156 vap->iv_stats.is_rx_bad_auth++; 1157 estatus = IEEE80211_STATUS_SEQUENCE; 1158 goto bad; 1159 } 1160 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1161 return; 1162bad: 1163 /* 1164 * Send an error response; but only when operating as an AP. 1165 */ 1166 /* XXX hack to workaround calling convention */ 1167 ieee80211_send_error(ni, wh->i_addr2, 1168 IEEE80211_FC0_SUBTYPE_AUTH, 1169 (seq + 1) | (estatus<<16)); 1170} 1171 1172/* 1173 * Convert a WPA cipher selector OUI to an internal 1174 * cipher algorithm. Where appropriate we also 1175 * record any key length. 1176 */ 1177static int 1178wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1179{ 1180#define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1181 uint32_t w = LE_READ_4(sel); 1182 1183 switch (w) { 1184 case WPA_SEL(WPA_CSE_NULL): 1185 return IEEE80211_CIPHER_NONE; 1186 case WPA_SEL(WPA_CSE_WEP40): 1187 if (keylen) 1188 *keylen = 40 / NBBY; 1189 return IEEE80211_CIPHER_WEP; 1190 case WPA_SEL(WPA_CSE_WEP104): 1191 if (keylen) 1192 *keylen = 104 / NBBY; 1193 return IEEE80211_CIPHER_WEP; 1194 case WPA_SEL(WPA_CSE_TKIP): 1195 return IEEE80211_CIPHER_TKIP; 1196 case WPA_SEL(WPA_CSE_CCMP): 1197 return IEEE80211_CIPHER_AES_CCM; 1198 } 1199 return 32; /* NB: so 1<< is discarded */ 1200#undef WPA_SEL 1201} 1202 1203/* 1204 * Convert a WPA key management/authentication algorithm 1205 * to an internal code. 1206 */ 1207static int 1208wpa_keymgmt(const uint8_t *sel) 1209{ 1210#define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1211 uint32_t w = LE_READ_4(sel); 1212 1213 switch (w) { 1214 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1215 return WPA_ASE_8021X_UNSPEC; 1216 case WPA_SEL(WPA_ASE_8021X_PSK): 1217 return WPA_ASE_8021X_PSK; 1218 case WPA_SEL(WPA_ASE_NONE): 1219 return WPA_ASE_NONE; 1220 } 1221 return 0; /* NB: so is discarded */ 1222#undef WPA_SEL 1223} 1224 1225/* 1226 * Parse a WPA information element to collect parameters. 1227 * Note that we do not validate security parameters; that 1228 * is handled by the authenticator; the parsing done here 1229 * is just for internal use in making operational decisions. 1230 */ 1231static int 1232ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1233 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1234{ 1235 uint8_t len = frm[1]; 1236 uint32_t w; 1237 int n; 1238 1239 /* 1240 * Check the length once for fixed parts: OUI, type, 1241 * version, mcast cipher, and 2 selector counts. 1242 * Other, variable-length data, must be checked separately. 1243 */ 1244 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1245 IEEE80211_DISCARD_IE(vap, 1246 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1247 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1248 return IEEE80211_REASON_IE_INVALID; 1249 } 1250 if (len < 14) { 1251 IEEE80211_DISCARD_IE(vap, 1252 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1253 wh, "WPA", "too short, len %u", len); 1254 return IEEE80211_REASON_IE_INVALID; 1255 } 1256 frm += 6, len -= 4; /* NB: len is payload only */ 1257 /* NB: iswpaoui already validated the OUI and type */ 1258 w = LE_READ_2(frm); 1259 if (w != WPA_VERSION) { 1260 IEEE80211_DISCARD_IE(vap, 1261 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1262 wh, "WPA", "bad version %u", w); 1263 return IEEE80211_REASON_IE_INVALID; 1264 } 1265 frm += 2, len -= 2; 1266 1267 memset(rsn, 0, sizeof(*rsn)); 1268 1269 /* multicast/group cipher */ 1270 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1271 frm += 4, len -= 4; 1272 1273 /* unicast ciphers */ 1274 n = LE_READ_2(frm); 1275 frm += 2, len -= 2; 1276 if (len < n*4+2) { 1277 IEEE80211_DISCARD_IE(vap, 1278 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1279 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1280 len, n); 1281 return IEEE80211_REASON_IE_INVALID; 1282 } 1283 w = 0; 1284 for (; n > 0; n--) { 1285 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1286 frm += 4, len -= 4; 1287 } 1288 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1289 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1290 else 1291 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1292 1293 /* key management algorithms */ 1294 n = LE_READ_2(frm); 1295 frm += 2, len -= 2; 1296 if (len < n*4) { 1297 IEEE80211_DISCARD_IE(vap, 1298 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1299 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1300 len, n); 1301 return IEEE80211_REASON_IE_INVALID; 1302 } 1303 w = 0; 1304 for (; n > 0; n--) { 1305 w |= wpa_keymgmt(frm); 1306 frm += 4, len -= 4; 1307 } 1308 if (w & WPA_ASE_8021X_UNSPEC) 1309 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1310 else 1311 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1312 1313 if (len > 2) /* optional capabilities */ 1314 rsn->rsn_caps = LE_READ_2(frm); 1315 1316 return 0; 1317} 1318 1319/* 1320 * Convert an RSN cipher selector OUI to an internal 1321 * cipher algorithm. Where appropriate we also 1322 * record any key length. 1323 */ 1324static int 1325rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1326{ 1327#define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1328 uint32_t w = LE_READ_4(sel); 1329 1330 switch (w) { 1331 case RSN_SEL(RSN_CSE_NULL): 1332 return IEEE80211_CIPHER_NONE; 1333 case RSN_SEL(RSN_CSE_WEP40): 1334 if (keylen) 1335 *keylen = 40 / NBBY; 1336 return IEEE80211_CIPHER_WEP; 1337 case RSN_SEL(RSN_CSE_WEP104): 1338 if (keylen) 1339 *keylen = 104 / NBBY; 1340 return IEEE80211_CIPHER_WEP; 1341 case RSN_SEL(RSN_CSE_TKIP): 1342 return IEEE80211_CIPHER_TKIP; 1343 case RSN_SEL(RSN_CSE_CCMP): 1344 return IEEE80211_CIPHER_AES_CCM; 1345 case RSN_SEL(RSN_CSE_WRAP): 1346 return IEEE80211_CIPHER_AES_OCB; 1347 } 1348 return 32; /* NB: so 1<< is discarded */ 1349#undef WPA_SEL 1350} 1351 1352/* 1353 * Convert an RSN key management/authentication algorithm 1354 * to an internal code. 1355 */ 1356static int 1357rsn_keymgmt(const uint8_t *sel) 1358{ 1359#define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1360 uint32_t w = LE_READ_4(sel); 1361 1362 switch (w) { 1363 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1364 return RSN_ASE_8021X_UNSPEC; 1365 case RSN_SEL(RSN_ASE_8021X_PSK): 1366 return RSN_ASE_8021X_PSK; 1367 case RSN_SEL(RSN_ASE_NONE): 1368 return RSN_ASE_NONE; 1369 } 1370 return 0; /* NB: so is discarded */ 1371#undef RSN_SEL 1372} 1373 1374/* 1375 * Parse a WPA/RSN information element to collect parameters 1376 * and validate the parameters against what has been 1377 * configured for the system. 1378 */ 1379static int 1380ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1381 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1382{ 1383 uint8_t len = frm[1]; 1384 uint32_t w; 1385 int n; 1386 1387 /* 1388 * Check the length once for fixed parts: 1389 * version, mcast cipher, and 2 selector counts. 1390 * Other, variable-length data, must be checked separately. 1391 */ 1392 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1393 IEEE80211_DISCARD_IE(vap, 1394 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1395 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1396 return IEEE80211_REASON_IE_INVALID; 1397 } 1398 if (len < 10) { 1399 IEEE80211_DISCARD_IE(vap, 1400 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1401 wh, "RSN", "too short, len %u", len); 1402 return IEEE80211_REASON_IE_INVALID; 1403 } 1404 frm += 2; 1405 w = LE_READ_2(frm); 1406 if (w != RSN_VERSION) { 1407 IEEE80211_DISCARD_IE(vap, 1408 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1409 wh, "RSN", "bad version %u", w); 1410 return IEEE80211_REASON_IE_INVALID; 1411 } 1412 frm += 2, len -= 2; 1413 1414 memset(rsn, 0, sizeof(*rsn)); 1415 1416 /* multicast/group cipher */ 1417 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1418 frm += 4, len -= 4; 1419 1420 /* unicast ciphers */ 1421 n = LE_READ_2(frm); 1422 frm += 2, len -= 2; 1423 if (len < n*4+2) { 1424 IEEE80211_DISCARD_IE(vap, 1425 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1426 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1427 len, n); 1428 return IEEE80211_REASON_IE_INVALID; 1429 } 1430 w = 0; 1431 for (; n > 0; n--) { 1432 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1433 frm += 4, len -= 4; 1434 } 1435 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1436 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1437 else 1438 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1439 1440 /* key management algorithms */ 1441 n = LE_READ_2(frm); 1442 frm += 2, len -= 2; 1443 if (len < n*4) { 1444 IEEE80211_DISCARD_IE(vap, 1445 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1446 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1447 len, n); 1448 return IEEE80211_REASON_IE_INVALID; 1449 } 1450 w = 0; 1451 for (; n > 0; n--) { 1452 w |= rsn_keymgmt(frm); 1453 frm += 4, len -= 4; 1454 } 1455 if (w & RSN_ASE_8021X_UNSPEC) 1456 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1457 else 1458 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1459 1460 /* optional RSN capabilities */ 1461 if (len > 2) 1462 rsn->rsn_caps = LE_READ_2(frm); 1463 /* XXXPMKID */ 1464 1465 return 0; 1466} 1467 1468/* 1469 * WPA/802.11i assocation request processing. 1470 */ 1471static int 1472wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1473 const struct ieee80211_frame *wh, const uint8_t *wpa, 1474 const uint8_t *rsn, uint16_t capinfo) 1475{ 1476 struct ieee80211vap *vap = ni->ni_vap; 1477 uint8_t reason; 1478 int badwparsn; 1479 1480 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1481 if (wpa == NULL && rsn == NULL) { 1482 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1483 /* 1484 * W-Fi Protected Setup (WPS) permits 1485 * clients to associate and pass EAPOL frames 1486 * to establish initial credentials. 1487 */ 1488 ni->ni_flags |= IEEE80211_NODE_WPS; 1489 return 1; 1490 } 1491 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1492 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1493 /* 1494 * Transitional Security Network. Permits clients 1495 * to associate and use WEP while WPA is configured. 1496 */ 1497 ni->ni_flags |= IEEE80211_NODE_TSN; 1498 return 1; 1499 } 1500 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1501 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1502 vap->iv_stats.is_rx_assoc_badwpaie++; 1503 reason = IEEE80211_REASON_IE_INVALID; 1504 goto bad; 1505 } 1506 /* assert right association security credentials */ 1507 badwparsn = 0; /* NB: to silence compiler */ 1508 switch (vap->iv_flags & IEEE80211_F_WPA) { 1509 case IEEE80211_F_WPA1: 1510 badwparsn = (wpa == NULL); 1511 break; 1512 case IEEE80211_F_WPA2: 1513 badwparsn = (rsn == NULL); 1514 break; 1515 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1516 badwparsn = (wpa == NULL && rsn == NULL); 1517 break; 1518 } 1519 if (badwparsn) { 1520 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1521 wh, NULL, 1522 "%s", "missing WPA/RSN IE in association request"); 1523 vap->iv_stats.is_rx_assoc_badwpaie++; 1524 reason = IEEE80211_REASON_IE_INVALID; 1525 goto bad; 1526 } 1527 /* 1528 * Parse WPA/RSN information element. 1529 */ 1530 if (wpa != NULL) 1531 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1532 else 1533 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1534 if (reason != 0) { 1535 /* XXX distinguish WPA/RSN? */ 1536 vap->iv_stats.is_rx_assoc_badwpaie++; 1537 goto bad; 1538 } 1539 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1540 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1541 wpa != NULL ? "WPA" : "RSN", 1542 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1543 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1544 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1545 1546 return 1; 1547bad: 1548 ieee80211_node_deauth(ni, reason); 1549 return 0; 1550} 1551 1552/* XXX find a better place for definition */ 1553struct l2_update_frame { 1554 struct ether_header eh; 1555 uint8_t dsap; 1556 uint8_t ssap; 1557 uint8_t control; 1558 uint8_t xid[3]; 1559} __packed; 1560 1561/* 1562 * Deliver a TGf L2UF frame on behalf of a station. 1563 * This primes any bridge when the station is roaming 1564 * between ap's on the same wired network. 1565 */ 1566static void 1567ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1568{ 1569 struct ieee80211vap *vap = ni->ni_vap; 1570 struct ifnet *ifp = vap->iv_ifp; 1571 struct mbuf *m; 1572 struct l2_update_frame *l2uf; 1573 struct ether_header *eh; 1574 1575 m = m_gethdr(M_NOWAIT, MT_DATA); 1576 if (m == NULL) { 1577 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1578 "%s", "no mbuf for l2uf frame"); 1579 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1580 return; 1581 } 1582 l2uf = mtod(m, struct l2_update_frame *); 1583 eh = &l2uf->eh; 1584 /* dst: Broadcast address */ 1585 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1586 /* src: associated STA */ 1587 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1588 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1589 1590 l2uf->dsap = 0; 1591 l2uf->ssap = 0; 1592 l2uf->control = 0xf5; 1593 l2uf->xid[0] = 0x81; 1594 l2uf->xid[1] = 0x80; 1595 l2uf->xid[2] = 0x00; 1596 1597 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1598 hostap_deliver_data(vap, ni, m); 1599} 1600 1601static void 1602ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1603 int reassoc, int resp, const char *tag, int rate) 1604{ 1605 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1606 "deny %s request, %s rate set mismatch, rate/MCS %d", 1607 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1608 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1609 ieee80211_node_leave(ni); 1610} 1611 1612static void 1613capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1614 int reassoc, int resp, const char *tag, int capinfo) 1615{ 1616 struct ieee80211vap *vap = ni->ni_vap; 1617 1618 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1619 "deny %s request, %s mismatch 0x%x", 1620 reassoc ? "reassoc" : "assoc", tag, capinfo); 1621 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1622 ieee80211_node_leave(ni); 1623 vap->iv_stats.is_rx_assoc_capmismatch++; 1624} 1625 1626static void 1627htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1628 int reassoc, int resp) 1629{ 1630 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1631 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1632 /* XXX no better code */ 1633 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1634 ieee80211_node_leave(ni); 1635} 1636 1637static void 1638authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1639 int algo, int seq, int status) 1640{ 1641 struct ieee80211vap *vap = ni->ni_vap; 1642 1643 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1644 wh, NULL, "unsupported alg %d", algo); 1645 vap->iv_stats.is_rx_auth_unsupported++; 1646 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1647 seq | (status << 16)); 1648} 1649 1650static __inline int 1651ishtmixed(const uint8_t *ie) 1652{ 1653 const struct ieee80211_ie_htinfo *ht = 1654 (const struct ieee80211_ie_htinfo *) ie; 1655 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1656 IEEE80211_HTINFO_OPMODE_MIXED; 1657} 1658 1659static int 1660is11bclient(const uint8_t *rates, const uint8_t *xrates) 1661{ 1662 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1663 int i; 1664 1665 /* NB: the 11b clients we care about will not have xrates */ 1666 if (xrates != NULL || rates == NULL) 1667 return 0; 1668 for (i = 0; i < rates[1]; i++) { 1669 int r = rates[2+i] & IEEE80211_RATE_VAL; 1670 if (r > 2*11 || ((1<<r) & brates) == 0) 1671 return 0; 1672 } 1673 return 1; 1674} 1675 1676static void 1677hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1678 int subtype, int rssi, int nf) 1679{ 1680 struct ieee80211vap *vap = ni->ni_vap; 1681 struct ieee80211com *ic = ni->ni_ic; 1682 struct ieee80211_frame *wh; 1683 uint8_t *frm, *efrm, *sfrm; 1684 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1685 int reassoc, resp; 1686 uint8_t rate; 1687 1688 wh = mtod(m0, struct ieee80211_frame *); 1689 frm = (uint8_t *)&wh[1]; 1690 efrm = mtod(m0, uint8_t *) + m0->m_len; 1691 switch (subtype) { 1692 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1693 case IEEE80211_FC0_SUBTYPE_BEACON: { 1694 struct ieee80211_scanparams scan; 1695 /* 1696 * We process beacon/probe response frames when scanning; 1697 * otherwise we check beacon frames for overlapping non-ERP 1698 * BSS in 11g and/or overlapping legacy BSS when in HT. 1699 */ 1700 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1701 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1702 vap->iv_stats.is_rx_mgtdiscard++; 1703 return; 1704 } 1705 /* NB: accept off-channel frames */ 1706 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1707 return; 1708 /* 1709 * Count frame now that we know it's to be processed. 1710 */ 1711 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1712 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1713 IEEE80211_NODE_STAT(ni, rx_beacons); 1714 } else 1715 IEEE80211_NODE_STAT(ni, rx_proberesp); 1716 /* 1717 * If scanning, just pass information to the scan module. 1718 */ 1719 if (ic->ic_flags & IEEE80211_F_SCAN) { 1720 if (scan.status == 0 && /* NB: on channel */ 1721 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1722 /* 1723 * Actively scanning a channel marked passive; 1724 * send a probe request now that we know there 1725 * is 802.11 traffic present. 1726 * 1727 * XXX check if the beacon we recv'd gives 1728 * us what we need and suppress the probe req 1729 */ 1730 ieee80211_probe_curchan(vap, 1); 1731 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1732 } 1733 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1734 return; 1735 } 1736 /* 1737 * Check beacon for overlapping bss w/ non ERP stations. 1738 * If we detect one and protection is configured but not 1739 * enabled, enable it and start a timer that'll bring us 1740 * out if we stop seeing the bss. 1741 */ 1742 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1743 scan.status == 0 && /* NB: on-channel */ 1744 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1745 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1746 ic->ic_lastnonerp = ticks; 1747 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1748 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1749 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1750 IEEE80211_NOTE_FRAME(vap, 1751 IEEE80211_MSG_ASSOC, wh, 1752 "non-ERP present on channel %d " 1753 "(saw erp 0x%x from channel %d), " 1754 "enable use of protection", 1755 ic->ic_curchan->ic_ieee, 1756 scan.erp, scan.chan); 1757 ic->ic_flags |= IEEE80211_F_USEPROT; 1758 ieee80211_notify_erp(ic); 1759 } 1760 } 1761 /* 1762 * Check beacon for non-HT station on HT channel 1763 * and update HT BSS occupancy as appropriate. 1764 */ 1765 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1766 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1767 /* 1768 * Off control channel; only check frames 1769 * that come in the extension channel when 1770 * operating w/ HT40. 1771 */ 1772 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1773 break; 1774 if (scan.chan != ic->ic_curchan->ic_extieee) 1775 break; 1776 } 1777 if (scan.htinfo == NULL) { 1778 ieee80211_htprot_update(ic, 1779 IEEE80211_HTINFO_OPMODE_PROTOPT | 1780 IEEE80211_HTINFO_NONHT_PRESENT); 1781 } else if (ishtmixed(scan.htinfo)) { 1782 /* XXX? take NONHT_PRESENT from beacon? */ 1783 ieee80211_htprot_update(ic, 1784 IEEE80211_HTINFO_OPMODE_MIXED | 1785 IEEE80211_HTINFO_NONHT_PRESENT); 1786 } 1787 } 1788 break; 1789 } 1790 1791 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1792 if (vap->iv_state != IEEE80211_S_RUN) { 1793 vap->iv_stats.is_rx_mgtdiscard++; 1794 return; 1795 } 1796 /* 1797 * prreq frame format 1798 * [tlv] ssid 1799 * [tlv] supported rates 1800 * [tlv] extended supported rates 1801 */ 1802 ssid = rates = xrates = NULL; 1803 sfrm = frm; 1804 while (efrm - frm > 1) { 1805 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1806 switch (*frm) { 1807 case IEEE80211_ELEMID_SSID: 1808 ssid = frm; 1809 break; 1810 case IEEE80211_ELEMID_RATES: 1811 rates = frm; 1812 break; 1813 case IEEE80211_ELEMID_XRATES: 1814 xrates = frm; 1815 break; 1816 } 1817 frm += frm[1] + 2; 1818 } 1819 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1820 if (xrates != NULL) 1821 IEEE80211_VERIFY_ELEMENT(xrates, 1822 IEEE80211_RATE_MAXSIZE - rates[1], return); 1823 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1824 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1825 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1826 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1827 wh, NULL, 1828 "%s", "no ssid with ssid suppression enabled"); 1829 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1830 return; 1831 } 1832 1833 /* XXX find a better class or define it's own */ 1834 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1835 "%s", "recv probe req"); 1836 /* 1837 * Some legacy 11b clients cannot hack a complete 1838 * probe response frame. When the request includes 1839 * only a bare-bones rate set, communicate this to 1840 * the transmit side. 1841 */ 1842 ieee80211_send_proberesp(vap, wh->i_addr2, 1843 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1844 break; 1845 1846 case IEEE80211_FC0_SUBTYPE_AUTH: { 1847 uint16_t algo, seq, status; 1848 1849 if (vap->iv_state != IEEE80211_S_RUN) { 1850 vap->iv_stats.is_rx_mgtdiscard++; 1851 return; 1852 } 1853 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1854 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1855 wh, NULL, "%s", "wrong bssid"); 1856 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1857 return; 1858 } 1859 /* 1860 * auth frame format 1861 * [2] algorithm 1862 * [2] sequence 1863 * [2] status 1864 * [tlv*] challenge 1865 */ 1866 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1867 algo = le16toh(*(uint16_t *)frm); 1868 seq = le16toh(*(uint16_t *)(frm + 2)); 1869 status = le16toh(*(uint16_t *)(frm + 4)); 1870 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1871 "recv auth frame with algorithm %d seq %d", algo, seq); 1872 /* 1873 * Consult the ACL policy module if setup. 1874 */ 1875 if (vap->iv_acl != NULL && 1876 !vap->iv_acl->iac_check(vap, wh->i_addr2)) { 1877 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1878 wh, NULL, "%s", "disallowed by ACL"); 1879 vap->iv_stats.is_rx_acl++; 1880 ieee80211_send_error(ni, wh->i_addr2, 1881 IEEE80211_FC0_SUBTYPE_AUTH, 1882 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1883 return; 1884 } 1885 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1886 IEEE80211_DISCARD(vap, 1887 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1888 wh, NULL, "%s", "TKIP countermeasures enabled"); 1889 vap->iv_stats.is_rx_auth_countermeasures++; 1890 ieee80211_send_error(ni, wh->i_addr2, 1891 IEEE80211_FC0_SUBTYPE_AUTH, 1892 IEEE80211_REASON_MIC_FAILURE); 1893 return; 1894 } 1895 if (algo == IEEE80211_AUTH_ALG_SHARED) 1896 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1897 seq, status); 1898 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1899 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1900 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1901 authalgreject(ni, wh, algo, 1902 seq+1, IEEE80211_STATUS_ALG); 1903 return; 1904 } else { 1905 /* 1906 * We assume that an unknown algorithm is the result 1907 * of a decryption failure on a shared key auth frame; 1908 * return a status code appropriate for that instead 1909 * of IEEE80211_STATUS_ALG. 1910 * 1911 * NB: a seq# of 4 is intentional; the decrypted 1912 * frame likely has a bogus seq value. 1913 */ 1914 authalgreject(ni, wh, algo, 1915 4, IEEE80211_STATUS_CHALLENGE); 1916 return; 1917 } 1918 break; 1919 } 1920 1921 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1922 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1923 uint16_t capinfo, lintval; 1924 struct ieee80211_rsnparms rsnparms; 1925 1926 if (vap->iv_state != IEEE80211_S_RUN) { 1927 vap->iv_stats.is_rx_mgtdiscard++; 1928 return; 1929 } 1930 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1931 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1932 wh, NULL, "%s", "wrong bssid"); 1933 vap->iv_stats.is_rx_assoc_bss++; 1934 return; 1935 } 1936 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1937 reassoc = 1; 1938 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1939 } else { 1940 reassoc = 0; 1941 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1942 } 1943 if (ni == vap->iv_bss) { 1944 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1945 "deny %s request, sta not authenticated", 1946 reassoc ? "reassoc" : "assoc"); 1947 ieee80211_send_error(ni, wh->i_addr2, 1948 IEEE80211_FC0_SUBTYPE_DEAUTH, 1949 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1950 vap->iv_stats.is_rx_assoc_notauth++; 1951 return; 1952 } 1953 1954 /* 1955 * asreq frame format 1956 * [2] capability information 1957 * [2] listen interval 1958 * [6*] current AP address (reassoc only) 1959 * [tlv] ssid 1960 * [tlv] supported rates 1961 * [tlv] extended supported rates 1962 * [tlv] WPA or RSN 1963 * [tlv] HT capabilities 1964 * [tlv] Atheros capabilities 1965 */ 1966 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1967 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1968 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1969 if (reassoc) 1970 frm += 6; /* ignore current AP info */ 1971 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1972 sfrm = frm; 1973 while (efrm - frm > 1) { 1974 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1975 switch (*frm) { 1976 case IEEE80211_ELEMID_SSID: 1977 ssid = frm; 1978 break; 1979 case IEEE80211_ELEMID_RATES: 1980 rates = frm; 1981 break; 1982 case IEEE80211_ELEMID_XRATES: 1983 xrates = frm; 1984 break; 1985 case IEEE80211_ELEMID_RSN: 1986 rsn = frm; 1987 break; 1988 case IEEE80211_ELEMID_HTCAP: 1989 htcap = frm; 1990 break; 1991 case IEEE80211_ELEMID_VENDOR: 1992 if (iswpaoui(frm)) 1993 wpa = frm; 1994 else if (iswmeinfo(frm)) 1995 wme = frm; 1996#ifdef IEEE80211_SUPPORT_SUPERG 1997 else if (isatherosoui(frm)) 1998 ath = frm; 1999#endif 2000 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 2001 if (ishtcapoui(frm) && htcap == NULL) 2002 htcap = frm; 2003 } 2004 break; 2005 } 2006 frm += frm[1] + 2; 2007 } 2008 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2009 if (xrates != NULL) 2010 IEEE80211_VERIFY_ELEMENT(xrates, 2011 IEEE80211_RATE_MAXSIZE - rates[1], return); 2012 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2013 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2014 if (htcap != NULL) { 2015 IEEE80211_VERIFY_LENGTH(htcap[1], 2016 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2017 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2018 sizeof(struct ieee80211_ie_htcap)-2, 2019 return); /* XXX just NULL out? */ 2020 } 2021 2022 if ((vap->iv_flags & IEEE80211_F_WPA) && 2023 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2024 return; 2025 /* discard challenge after association */ 2026 if (ni->ni_challenge != NULL) { 2027 free(ni->ni_challenge, M_80211_NODE); 2028 ni->ni_challenge = NULL; 2029 } 2030 /* NB: 802.11 spec says to ignore station's privacy bit */ 2031 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2032 capinfomismatch(ni, wh, reassoc, resp, 2033 "capability", capinfo); 2034 return; 2035 } 2036 /* 2037 * Disallow re-associate w/ invalid slot time setting. 2038 */ 2039 if (ni->ni_associd != 0 && 2040 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2041 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2042 capinfomismatch(ni, wh, reassoc, resp, 2043 "slot time", capinfo); 2044 return; 2045 } 2046 rate = ieee80211_setup_rates(ni, rates, xrates, 2047 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2048 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2049 if (rate & IEEE80211_RATE_BASIC) { 2050 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2051 vap->iv_stats.is_rx_assoc_norate++; 2052 return; 2053 } 2054 /* 2055 * If constrained to 11g-only stations reject an 2056 * 11b-only station. We cheat a bit here by looking 2057 * at the max negotiated xmit rate and assuming anyone 2058 * with a best rate <24Mb/s is an 11b station. 2059 */ 2060 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2061 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2062 vap->iv_stats.is_rx_assoc_norate++; 2063 return; 2064 } 2065 /* 2066 * Do HT rate set handling and setup HT node state. 2067 */ 2068 ni->ni_chan = vap->iv_bss->ni_chan; 2069 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2070 rate = ieee80211_setup_htrates(ni, htcap, 2071 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2072 IEEE80211_F_DOBRS); 2073 if (rate & IEEE80211_RATE_BASIC) { 2074 ratesetmismatch(ni, wh, reassoc, resp, 2075 "HT", rate); 2076 vap->iv_stats.is_ht_assoc_norate++; 2077 return; 2078 } 2079 ieee80211_ht_node_init(ni); 2080 ieee80211_ht_updatehtcap(ni, htcap); 2081 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2082 ieee80211_ht_node_cleanup(ni); 2083#ifdef IEEE80211_SUPPORT_SUPERG 2084 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2085 ieee80211_ff_node_cleanup(ni); 2086#endif 2087 /* 2088 * Allow AMPDU operation only with unencrypted traffic 2089 * or AES-CCM; the 11n spec only specifies these ciphers 2090 * so permitting any others is undefined and can lead 2091 * to interoperability problems. 2092 */ 2093 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2094 (((vap->iv_flags & IEEE80211_F_WPA) && 2095 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2096 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2097 IEEE80211_NOTE(vap, 2098 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2099 "disallow HT use because WEP or TKIP requested, " 2100 "capinfo 0x%x ucastcipher %d", capinfo, 2101 rsnparms.rsn_ucastcipher); 2102 ieee80211_ht_node_cleanup(ni); 2103 vap->iv_stats.is_ht_assoc_downgrade++; 2104 } 2105 /* 2106 * If constrained to 11n-only stations reject legacy stations. 2107 */ 2108 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2109 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2110 htcapmismatch(ni, wh, reassoc, resp); 2111 vap->iv_stats.is_ht_assoc_nohtcap++; 2112 return; 2113 } 2114 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2115 ni->ni_noise = nf; 2116 ni->ni_intval = lintval; 2117 ni->ni_capinfo = capinfo; 2118 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2119 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2120 /* 2121 * Store the IEs. 2122 * XXX maybe better to just expand 2123 */ 2124 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2125#define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2126 if (wpa != NULL) 2127 setie(wpa_ie, wpa - sfrm); 2128 if (rsn != NULL) 2129 setie(rsn_ie, rsn - sfrm); 2130 if (htcap != NULL) 2131 setie(htcap_ie, htcap - sfrm); 2132 if (wme != NULL) { 2133 setie(wme_ie, wme - sfrm); 2134 /* 2135 * Mark node as capable of QoS. 2136 */ 2137 ni->ni_flags |= IEEE80211_NODE_QOS; 2138 } else 2139 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2140#ifdef IEEE80211_SUPPORT_SUPERG 2141 if (ath != NULL) { 2142 setie(ath_ie, ath - sfrm); 2143 /* 2144 * Parse ATH station parameters. 2145 */ 2146 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2147 } else 2148#endif 2149 ni->ni_ath_flags = 0; 2150#undef setie 2151 } else { 2152 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2153 ni->ni_ath_flags = 0; 2154 } 2155 ieee80211_node_join(ni, resp); 2156 ieee80211_deliver_l2uf(ni); 2157 break; 2158 } 2159 2160 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2161 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2162 uint16_t reason; 2163 2164 if (vap->iv_state != IEEE80211_S_RUN || 2165 /* NB: can happen when in promiscuous mode */ 2166 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2167 vap->iv_stats.is_rx_mgtdiscard++; 2168 break; 2169 } 2170 /* 2171 * deauth/disassoc frame format 2172 * [2] reason 2173 */ 2174 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2175 reason = le16toh(*(uint16_t *)frm); 2176 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2177 vap->iv_stats.is_rx_deauth++; 2178 IEEE80211_NODE_STAT(ni, rx_deauth); 2179 } else { 2180 vap->iv_stats.is_rx_disassoc++; 2181 IEEE80211_NODE_STAT(ni, rx_disassoc); 2182 } 2183 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2184 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2185 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2186 if (ni != vap->iv_bss) 2187 ieee80211_node_leave(ni); 2188 break; 2189 } 2190 2191 case IEEE80211_FC0_SUBTYPE_ACTION: 2192 if (vap->iv_state == IEEE80211_S_RUN) { 2193 if (ieee80211_parse_action(ni, m0) == 0) 2194 ic->ic_recv_action(ni, wh, frm, efrm); 2195 } else 2196 vap->iv_stats.is_rx_mgtdiscard++; 2197 break; 2198 2199 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2200 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2201 default: 2202 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2203 wh, "mgt", "subtype 0x%x not handled", subtype); 2204 vap->iv_stats.is_rx_badsubtype++; 2205 break; 2206 } 2207} 2208 2209static void 2210hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2211{ 2212 switch (subtype) { 2213 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2214 hostap_recv_pspoll(ni, m); 2215 break; 2216 case IEEE80211_FC0_SUBTYPE_BAR: 2217 ieee80211_recv_bar(ni, m); 2218 break; 2219 } 2220} 2221 2222/* 2223 * Process a received ps-poll frame. 2224 */ 2225static void 2226hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2227{ 2228 struct ieee80211vap *vap = ni->ni_vap; 2229 struct ieee80211_frame_min *wh; 2230 struct ifnet *ifp; 2231 struct mbuf *m; 2232 uint16_t aid; 2233 int qlen; 2234 2235 wh = mtod(m0, struct ieee80211_frame_min *); 2236 if (ni->ni_associd == 0) { 2237 IEEE80211_DISCARD(vap, 2238 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2239 (struct ieee80211_frame *) wh, NULL, 2240 "%s", "unassociated station"); 2241 vap->iv_stats.is_ps_unassoc++; 2242 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2243 IEEE80211_REASON_NOT_ASSOCED); 2244 return; 2245 } 2246 2247 aid = le16toh(*(uint16_t *)wh->i_dur); 2248 if (aid != ni->ni_associd) { 2249 IEEE80211_DISCARD(vap, 2250 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2251 (struct ieee80211_frame *) wh, NULL, 2252 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2253 ni->ni_associd, aid); 2254 vap->iv_stats.is_ps_badaid++; 2255 /* 2256 * NB: We used to deauth the station but it turns out 2257 * the Blackberry Curve 8230 (and perhaps other devices) 2258 * sometimes send the wrong AID when WME is negotiated. 2259 * Being more lenient here seems ok as we already check 2260 * the station is associated and we only return frames 2261 * queued for the station (i.e. we don't use the AID). 2262 */ 2263 return; 2264 } 2265 2266 /* Okay, take the first queued packet and put it out... */ 2267 m = ieee80211_node_psq_dequeue(ni, &qlen); 2268 if (m == NULL) { 2269 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2270 "%s", "recv ps-poll, but queue empty"); 2271 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2272 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2273 if (vap->iv_set_tim != NULL) 2274 vap->iv_set_tim(ni, 0); /* just in case */ 2275 return; 2276 } 2277 /* 2278 * If there are more packets, set the more packets bit 2279 * in the packet dispatched to the station; otherwise 2280 * turn off the TIM bit. 2281 */ 2282 if (qlen != 0) { 2283 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2284 "recv ps-poll, send packet, %u still queued", qlen); 2285 m->m_flags |= M_MORE_DATA; 2286 } else { 2287 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2288 "%s", "recv ps-poll, send packet, queue empty"); 2289 if (vap->iv_set_tim != NULL) 2290 vap->iv_set_tim(ni, 0); 2291 } 2292 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2293 2294 if (m->m_flags & M_ENCAP) 2295 ifp = vap->iv_ic->ic_ifp; 2296 else 2297 ifp = vap->iv_ifp; 2298 IF_ENQUEUE(&ifp->if_snd, m); 2299 if_start(ifp); 2300} 2301