ieee80211_hostap.c revision 193543
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 193543 2009-06-05 23:21:29Z sam $"); 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_ext &= ~IEEE80211_FEXT_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_ext)); 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; 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 need_tap = 1; /* mbuf need to be tapped. */ 509 type = -1; /* undefined */ 510 511 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 512 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 513 ni->ni_macaddr, NULL, 514 "too short (1): len %u", m->m_pkthdr.len); 515 vap->iv_stats.is_rx_tooshort++; 516 goto out; 517 } 518 /* 519 * Bit of a cheat here, we use a pointer for a 3-address 520 * frame format but don't reference fields past outside 521 * ieee80211_frame_min w/o first validating the data is 522 * present. 523 */ 524 wh = mtod(m, struct ieee80211_frame *); 525 526 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 527 IEEE80211_FC0_VERSION_0) { 528 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 529 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 530 wh->i_fc[0], wh->i_fc[1]); 531 vap->iv_stats.is_rx_badversion++; 532 goto err; 533 } 534 535 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 536 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 537 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 538 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 539 if (dir != IEEE80211_FC1_DIR_NODS) 540 bssid = wh->i_addr1; 541 else if (type == IEEE80211_FC0_TYPE_CTL) 542 bssid = wh->i_addr1; 543 else { 544 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 545 IEEE80211_DISCARD_MAC(vap, 546 IEEE80211_MSG_ANY, ni->ni_macaddr, 547 NULL, "too short (2): len %u", 548 m->m_pkthdr.len); 549 vap->iv_stats.is_rx_tooshort++; 550 goto out; 551 } 552 bssid = wh->i_addr3; 553 } 554 /* 555 * Validate the bssid. 556 */ 557 if (!(type == IEEE80211_FC0_TYPE_MGT && 558 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 559 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 560 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 561 /* not interested in */ 562 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 563 bssid, NULL, "%s", "not to bss"); 564 vap->iv_stats.is_rx_wrongbss++; 565 goto out; 566 } 567 568 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 569 ni->ni_noise = nf; 570 if (HAS_SEQ(type)) { 571 uint8_t tid = ieee80211_gettid(wh); 572 if (IEEE80211_QOS_HAS_SEQ(wh) && 573 TID_TO_WME_AC(tid) >= WME_AC_VI) 574 ic->ic_wme.wme_hipri_traffic++; 575 rxseq = le16toh(*(uint16_t *)wh->i_seq); 576 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 577 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 578 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 579 /* duplicate, discard */ 580 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 581 bssid, "duplicate", 582 "seqno <%u,%u> fragno <%u,%u> tid %u", 583 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 584 ni->ni_rxseqs[tid] >> 585 IEEE80211_SEQ_SEQ_SHIFT, 586 rxseq & IEEE80211_SEQ_FRAG_MASK, 587 ni->ni_rxseqs[tid] & 588 IEEE80211_SEQ_FRAG_MASK, 589 tid); 590 vap->iv_stats.is_rx_dup++; 591 IEEE80211_NODE_STAT(ni, rx_dup); 592 goto out; 593 } 594 ni->ni_rxseqs[tid] = rxseq; 595 } 596 } 597 598 switch (type) { 599 case IEEE80211_FC0_TYPE_DATA: 600 hdrspace = ieee80211_hdrspace(ic, wh); 601 if (m->m_len < hdrspace && 602 (m = m_pullup(m, hdrspace)) == NULL) { 603 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 604 ni->ni_macaddr, NULL, 605 "data too short: expecting %u", hdrspace); 606 vap->iv_stats.is_rx_tooshort++; 607 goto out; /* XXX */ 608 } 609 if (!(dir == IEEE80211_FC1_DIR_TODS || 610 (dir == IEEE80211_FC1_DIR_DSTODS && 611 (vap->iv_flags & IEEE80211_F_DWDS)))) { 612 if (dir != IEEE80211_FC1_DIR_DSTODS) { 613 IEEE80211_DISCARD(vap, 614 IEEE80211_MSG_INPUT, wh, "data", 615 "incorrect dir 0x%x", dir); 616 } else { 617 IEEE80211_DISCARD(vap, 618 IEEE80211_MSG_INPUT | 619 IEEE80211_MSG_WDS, wh, 620 "4-address data", 621 "%s", "DWDS not enabled"); 622 } 623 vap->iv_stats.is_rx_wrongdir++; 624 goto out; 625 } 626 /* check if source STA is associated */ 627 if (ni == vap->iv_bss) { 628 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 629 wh, "data", "%s", "unknown src"); 630 ieee80211_send_error(ni, wh->i_addr2, 631 IEEE80211_FC0_SUBTYPE_DEAUTH, 632 IEEE80211_REASON_NOT_AUTHED); 633 vap->iv_stats.is_rx_notassoc++; 634 goto err; 635 } 636 if (ni->ni_associd == 0) { 637 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 638 wh, "data", "%s", "unassoc src"); 639 IEEE80211_SEND_MGMT(ni, 640 IEEE80211_FC0_SUBTYPE_DISASSOC, 641 IEEE80211_REASON_NOT_ASSOCED); 642 vap->iv_stats.is_rx_notassoc++; 643 goto err; 644 } 645 646 /* 647 * Check for power save state change. 648 * XXX out-of-order A-MPDU frames? 649 */ 650 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 651 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 652 ieee80211_node_pwrsave(ni, 653 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 654 /* 655 * For 4-address packets handle WDS discovery 656 * notifications. Once a WDS link is setup frames 657 * are just delivered to the WDS vap (see below). 658 */ 659 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 660 if (!ieee80211_node_is_authorized(ni)) { 661 IEEE80211_DISCARD(vap, 662 IEEE80211_MSG_INPUT | 663 IEEE80211_MSG_WDS, wh, 664 "4-address data", 665 "%s", "unauthorized port"); 666 vap->iv_stats.is_rx_unauth++; 667 IEEE80211_NODE_STAT(ni, rx_unauth); 668 goto err; 669 } 670 ieee80211_dwds_discover(ni, m); 671 return type; 672 } 673 674 /* 675 * Handle A-MPDU re-ordering. If the frame is to be 676 * processed directly then ieee80211_ampdu_reorder 677 * will return 0; otherwise it has consumed the mbuf 678 * and we should do nothing more with it. 679 */ 680 if ((m->m_flags & M_AMPDU) && 681 ieee80211_ampdu_reorder(ni, m) != 0) { 682 m = NULL; 683 goto out; 684 } 685 resubmit_ampdu: 686 687 /* 688 * Handle privacy requirements. Note that we 689 * must not be preempted from here until after 690 * we (potentially) call ieee80211_crypto_demic; 691 * otherwise we may violate assumptions in the 692 * crypto cipher modules used to do delayed update 693 * of replay sequence numbers. 694 */ 695 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 696 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 697 /* 698 * Discard encrypted frames when privacy is off. 699 */ 700 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 701 wh, "WEP", "%s", "PRIVACY off"); 702 vap->iv_stats.is_rx_noprivacy++; 703 IEEE80211_NODE_STAT(ni, rx_noprivacy); 704 goto out; 705 } 706 key = ieee80211_crypto_decap(ni, m, hdrspace); 707 if (key == NULL) { 708 /* NB: stats+msgs handled in crypto_decap */ 709 IEEE80211_NODE_STAT(ni, rx_wepfail); 710 goto out; 711 } 712 wh = mtod(m, struct ieee80211_frame *); 713 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 714 } else { 715 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 716 key = NULL; 717 } 718 719 /* 720 * Save QoS bits for use below--before we strip the header. 721 */ 722 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 723 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 724 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 725 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 726 } else 727 qos = 0; 728 729 /* 730 * Next up, any fragmentation. 731 */ 732 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 733 m = ieee80211_defrag(ni, m, hdrspace); 734 if (m == NULL) { 735 /* Fragment dropped or frame not complete yet */ 736 goto out; 737 } 738 } 739 wh = NULL; /* no longer valid, catch any uses */ 740 741 /* 742 * Next strip any MSDU crypto bits. 743 */ 744 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 745 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 746 ni->ni_macaddr, "data", "%s", "demic error"); 747 vap->iv_stats.is_rx_demicfail++; 748 IEEE80211_NODE_STAT(ni, rx_demicfail); 749 goto out; 750 } 751 /* copy to listener after decrypt */ 752 if (ieee80211_radiotap_active_vap(vap)) 753 ieee80211_radiotap_rx(vap, m); 754 need_tap = 0; 755 /* 756 * Finally, strip the 802.11 header. 757 */ 758 m = ieee80211_decap(vap, m, hdrspace); 759 if (m == NULL) { 760 /* XXX mask bit to check for both */ 761 /* don't count Null data frames as errors */ 762 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 763 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 764 goto out; 765 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 766 ni->ni_macaddr, "data", "%s", "decap error"); 767 vap->iv_stats.is_rx_decap++; 768 IEEE80211_NODE_STAT(ni, rx_decap); 769 goto err; 770 } 771 eh = mtod(m, struct ether_header *); 772 if (!ieee80211_node_is_authorized(ni)) { 773 /* 774 * Deny any non-PAE frames received prior to 775 * authorization. For open/shared-key 776 * authentication the port is mark authorized 777 * after authentication completes. For 802.1x 778 * the port is not marked authorized by the 779 * authenticator until the handshake has completed. 780 */ 781 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 782 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 783 eh->ether_shost, "data", 784 "unauthorized port: ether type 0x%x len %u", 785 eh->ether_type, m->m_pkthdr.len); 786 vap->iv_stats.is_rx_unauth++; 787 IEEE80211_NODE_STAT(ni, rx_unauth); 788 goto err; 789 } 790 } else { 791 /* 792 * When denying unencrypted frames, discard 793 * any non-PAE frames received without encryption. 794 */ 795 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 796 (key == NULL && (m->m_flags & M_WEP) == 0) && 797 eh->ether_type != htons(ETHERTYPE_PAE)) { 798 /* 799 * Drop unencrypted frames. 800 */ 801 vap->iv_stats.is_rx_unencrypted++; 802 IEEE80211_NODE_STAT(ni, rx_unencrypted); 803 goto out; 804 } 805 } 806 /* XXX require HT? */ 807 if (qos & IEEE80211_QOS_AMSDU) { 808 m = ieee80211_decap_amsdu(ni, m); 809 if (m == NULL) 810 return IEEE80211_FC0_TYPE_DATA; 811 } else { 812#ifdef IEEE80211_SUPPORT_SUPERG 813 m = ieee80211_decap_fastframe(vap, ni, m); 814 if (m == NULL) 815 return IEEE80211_FC0_TYPE_DATA; 816#endif 817 } 818 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 819 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 820 else 821 hostap_deliver_data(vap, ni, m); 822 return IEEE80211_FC0_TYPE_DATA; 823 824 case IEEE80211_FC0_TYPE_MGT: 825 vap->iv_stats.is_rx_mgmt++; 826 IEEE80211_NODE_STAT(ni, rx_mgmt); 827 if (dir != IEEE80211_FC1_DIR_NODS) { 828 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 829 wh, "mgt", "incorrect dir 0x%x", dir); 830 vap->iv_stats.is_rx_wrongdir++; 831 goto err; 832 } 833 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 834 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 835 ni->ni_macaddr, "mgt", "too short: len %u", 836 m->m_pkthdr.len); 837 vap->iv_stats.is_rx_tooshort++; 838 goto out; 839 } 840 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 841 /* ensure return frames are unicast */ 842 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 843 wh, NULL, "source is multicast: %s", 844 ether_sprintf(wh->i_addr2)); 845 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 846 goto out; 847 } 848#ifdef IEEE80211_DEBUG 849 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 850 ieee80211_msg_dumppkts(vap)) { 851 if_printf(ifp, "received %s from %s rssi %d\n", 852 ieee80211_mgt_subtype_name[subtype >> 853 IEEE80211_FC0_SUBTYPE_SHIFT], 854 ether_sprintf(wh->i_addr2), rssi); 855 } 856#endif 857 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 858 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 859 /* 860 * Only shared key auth frames with a challenge 861 * should be encrypted, discard all others. 862 */ 863 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 864 wh, NULL, 865 "%s", "WEP set but not permitted"); 866 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 867 goto out; 868 } 869 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 870 /* 871 * Discard encrypted frames when privacy is off. 872 */ 873 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 874 wh, NULL, "%s", "WEP set but PRIVACY off"); 875 vap->iv_stats.is_rx_noprivacy++; 876 goto out; 877 } 878 hdrspace = ieee80211_hdrspace(ic, wh); 879 key = ieee80211_crypto_decap(ni, m, hdrspace); 880 if (key == NULL) { 881 /* NB: stats+msgs handled in crypto_decap */ 882 goto out; 883 } 884 wh = mtod(m, struct ieee80211_frame *); 885 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 886 } 887 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 888 goto out; 889 890 case IEEE80211_FC0_TYPE_CTL: 891 vap->iv_stats.is_rx_ctl++; 892 IEEE80211_NODE_STAT(ni, rx_ctrl); 893 vap->iv_recv_ctl(ni, m, subtype); 894 goto out; 895 default: 896 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 897 wh, "bad", "frame type 0x%x", type); 898 /* should not come here */ 899 break; 900 } 901err: 902 ifp->if_ierrors++; 903out: 904 if (m != NULL) { 905 if (need_tap && ieee80211_radiotap_active_vap(vap)) 906 ieee80211_radiotap_rx(vap, m); 907 m_freem(m); 908 } 909 return type; 910#undef SEQ_LEQ 911} 912 913static void 914hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 915 int rssi, int nf, uint16_t seq, uint16_t status) 916{ 917 struct ieee80211vap *vap = ni->ni_vap; 918 919 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 920 921 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 922 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 923 ni->ni_macaddr, "open auth", 924 "bad sta auth mode %u", ni->ni_authmode); 925 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 926 /* 927 * Clear any challenge text that may be there if 928 * a previous shared key auth failed and then an 929 * open auth is attempted. 930 */ 931 if (ni->ni_challenge != NULL) { 932 free(ni->ni_challenge, M_80211_NODE); 933 ni->ni_challenge = NULL; 934 } 935 /* XXX hack to workaround calling convention */ 936 ieee80211_send_error(ni, wh->i_addr2, 937 IEEE80211_FC0_SUBTYPE_AUTH, 938 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 939 return; 940 } 941 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 942 vap->iv_stats.is_rx_bad_auth++; 943 return; 944 } 945 /* always accept open authentication requests */ 946 if (ni == vap->iv_bss) { 947 ni = ieee80211_dup_bss(vap, wh->i_addr2); 948 if (ni == NULL) 949 return; 950 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 951 (void) ieee80211_ref_node(ni); 952 /* 953 * Mark the node as referenced to reflect that it's 954 * reference count has been bumped to insure it remains 955 * after the transaction completes. 956 */ 957 ni->ni_flags |= IEEE80211_NODE_AREF; 958 /* 959 * Mark the node as requiring a valid association id 960 * before outbound traffic is permitted. 961 */ 962 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 963 964 if (vap->iv_acl != NULL && 965 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 966 /* 967 * When the ACL policy is set to RADIUS we defer the 968 * authorization to a user agent. Dispatch an event, 969 * a subsequent MLME call will decide the fate of the 970 * station. If the user agent is not present then the 971 * node will be reclaimed due to inactivity. 972 */ 973 IEEE80211_NOTE_MAC(vap, 974 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 975 "%s", "station authentication defered (radius acl)"); 976 ieee80211_notify_node_auth(ni); 977 } else { 978 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 979 IEEE80211_NOTE_MAC(vap, 980 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 981 "%s", "station authenticated (open)"); 982 /* 983 * When 802.1x is not in use mark the port 984 * authorized at this point so traffic can flow. 985 */ 986 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 987 ieee80211_node_authorize(ni); 988 } 989} 990 991static void 992hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 993 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 994 uint16_t seq, uint16_t status) 995{ 996 struct ieee80211vap *vap = ni->ni_vap; 997 uint8_t *challenge; 998 int allocbs, estatus; 999 1000 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 1001 1002 /* 1003 * NB: this can happen as we allow pre-shared key 1004 * authentication to be enabled w/o wep being turned 1005 * on so that configuration of these can be done 1006 * in any order. It may be better to enforce the 1007 * ordering in which case this check would just be 1008 * for sanity/consistency. 1009 */ 1010 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1011 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1012 ni->ni_macaddr, "shared key auth", 1013 "%s", " PRIVACY is disabled"); 1014 estatus = IEEE80211_STATUS_ALG; 1015 goto bad; 1016 } 1017 /* 1018 * Pre-shared key authentication is evil; accept 1019 * it only if explicitly configured (it is supported 1020 * mainly for compatibility with clients like Mac OS X). 1021 */ 1022 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1023 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1024 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1025 ni->ni_macaddr, "shared key auth", 1026 "bad sta auth mode %u", ni->ni_authmode); 1027 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1028 estatus = IEEE80211_STATUS_ALG; 1029 goto bad; 1030 } 1031 1032 challenge = NULL; 1033 if (frm + 1 < efrm) { 1034 if ((frm[1] + 2) > (efrm - frm)) { 1035 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1036 ni->ni_macaddr, "shared key auth", 1037 "ie %d/%d too long", 1038 frm[0], (frm[1] + 2) - (efrm - frm)); 1039 vap->iv_stats.is_rx_bad_auth++; 1040 estatus = IEEE80211_STATUS_CHALLENGE; 1041 goto bad; 1042 } 1043 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1044 challenge = frm; 1045 frm += frm[1] + 2; 1046 } 1047 switch (seq) { 1048 case IEEE80211_AUTH_SHARED_CHALLENGE: 1049 case IEEE80211_AUTH_SHARED_RESPONSE: 1050 if (challenge == NULL) { 1051 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1052 ni->ni_macaddr, "shared key auth", 1053 "%s", "no challenge"); 1054 vap->iv_stats.is_rx_bad_auth++; 1055 estatus = IEEE80211_STATUS_CHALLENGE; 1056 goto bad; 1057 } 1058 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1059 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1060 ni->ni_macaddr, "shared key auth", 1061 "bad challenge len %d", challenge[1]); 1062 vap->iv_stats.is_rx_bad_auth++; 1063 estatus = IEEE80211_STATUS_CHALLENGE; 1064 goto bad; 1065 } 1066 default: 1067 break; 1068 } 1069 switch (seq) { 1070 case IEEE80211_AUTH_SHARED_REQUEST: 1071 if (ni == vap->iv_bss) { 1072 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1073 if (ni == NULL) { 1074 /* NB: no way to return an error */ 1075 return; 1076 } 1077 allocbs = 1; 1078 } else { 1079 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1080 (void) ieee80211_ref_node(ni); 1081 allocbs = 0; 1082 } 1083 /* 1084 * Mark the node as referenced to reflect that it's 1085 * reference count has been bumped to insure it remains 1086 * after the transaction completes. 1087 */ 1088 ni->ni_flags |= IEEE80211_NODE_AREF; 1089 /* 1090 * Mark the node as requiring a valid associatio id 1091 * before outbound traffic is permitted. 1092 */ 1093 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1094 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1095 ni->ni_noise = nf; 1096 if (!ieee80211_alloc_challenge(ni)) { 1097 /* NB: don't return error so they rexmit */ 1098 return; 1099 } 1100 get_random_bytes(ni->ni_challenge, 1101 IEEE80211_CHALLENGE_LEN); 1102 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1103 ni, "shared key %sauth request", allocbs ? "" : "re"); 1104 /* 1105 * When the ACL policy is set to RADIUS we defer the 1106 * authorization to a user agent. Dispatch an event, 1107 * a subsequent MLME call will decide the fate of the 1108 * station. If the user agent is not present then the 1109 * node will be reclaimed due to inactivity. 1110 */ 1111 if (vap->iv_acl != NULL && 1112 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1113 IEEE80211_NOTE_MAC(vap, 1114 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1115 ni->ni_macaddr, 1116 "%s", "station authentication defered (radius acl)"); 1117 ieee80211_notify_node_auth(ni); 1118 return; 1119 } 1120 break; 1121 case IEEE80211_AUTH_SHARED_RESPONSE: 1122 if (ni == vap->iv_bss) { 1123 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1124 ni->ni_macaddr, "shared key response", 1125 "%s", "unknown station"); 1126 /* NB: don't send a response */ 1127 return; 1128 } 1129 if (ni->ni_challenge == NULL) { 1130 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1131 ni->ni_macaddr, "shared key response", 1132 "%s", "no challenge recorded"); 1133 vap->iv_stats.is_rx_bad_auth++; 1134 estatus = IEEE80211_STATUS_CHALLENGE; 1135 goto bad; 1136 } 1137 if (memcmp(ni->ni_challenge, &challenge[2], 1138 challenge[1]) != 0) { 1139 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1140 ni->ni_macaddr, "shared key response", 1141 "%s", "challenge mismatch"); 1142 vap->iv_stats.is_rx_auth_fail++; 1143 estatus = IEEE80211_STATUS_CHALLENGE; 1144 goto bad; 1145 } 1146 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1147 ni, "%s", "station authenticated (shared key)"); 1148 ieee80211_node_authorize(ni); 1149 break; 1150 default: 1151 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1152 ni->ni_macaddr, "shared key auth", 1153 "bad seq %d", seq); 1154 vap->iv_stats.is_rx_bad_auth++; 1155 estatus = IEEE80211_STATUS_SEQUENCE; 1156 goto bad; 1157 } 1158 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1159 return; 1160bad: 1161 /* 1162 * Send an error response; but only when operating as an AP. 1163 */ 1164 /* XXX hack to workaround calling convention */ 1165 ieee80211_send_error(ni, wh->i_addr2, 1166 IEEE80211_FC0_SUBTYPE_AUTH, 1167 (seq + 1) | (estatus<<16)); 1168} 1169 1170/* 1171 * Convert a WPA cipher selector OUI to an internal 1172 * cipher algorithm. Where appropriate we also 1173 * record any key length. 1174 */ 1175static int 1176wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1177{ 1178#define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1179 uint32_t w = LE_READ_4(sel); 1180 1181 switch (w) { 1182 case WPA_SEL(WPA_CSE_NULL): 1183 return IEEE80211_CIPHER_NONE; 1184 case WPA_SEL(WPA_CSE_WEP40): 1185 if (keylen) 1186 *keylen = 40 / NBBY; 1187 return IEEE80211_CIPHER_WEP; 1188 case WPA_SEL(WPA_CSE_WEP104): 1189 if (keylen) 1190 *keylen = 104 / NBBY; 1191 return IEEE80211_CIPHER_WEP; 1192 case WPA_SEL(WPA_CSE_TKIP): 1193 return IEEE80211_CIPHER_TKIP; 1194 case WPA_SEL(WPA_CSE_CCMP): 1195 return IEEE80211_CIPHER_AES_CCM; 1196 } 1197 return 32; /* NB: so 1<< is discarded */ 1198#undef WPA_SEL 1199} 1200 1201/* 1202 * Convert a WPA key management/authentication algorithm 1203 * to an internal code. 1204 */ 1205static int 1206wpa_keymgmt(const uint8_t *sel) 1207{ 1208#define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1209 uint32_t w = LE_READ_4(sel); 1210 1211 switch (w) { 1212 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1213 return WPA_ASE_8021X_UNSPEC; 1214 case WPA_SEL(WPA_ASE_8021X_PSK): 1215 return WPA_ASE_8021X_PSK; 1216 case WPA_SEL(WPA_ASE_NONE): 1217 return WPA_ASE_NONE; 1218 } 1219 return 0; /* NB: so is discarded */ 1220#undef WPA_SEL 1221} 1222 1223/* 1224 * Parse a WPA information element to collect parameters. 1225 * Note that we do not validate security parameters; that 1226 * is handled by the authenticator; the parsing done here 1227 * is just for internal use in making operational decisions. 1228 */ 1229static int 1230ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1231 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1232{ 1233 uint8_t len = frm[1]; 1234 uint32_t w; 1235 int n; 1236 1237 /* 1238 * Check the length once for fixed parts: OUI, type, 1239 * version, mcast cipher, and 2 selector counts. 1240 * Other, variable-length data, must be checked separately. 1241 */ 1242 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1243 IEEE80211_DISCARD_IE(vap, 1244 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1245 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1246 return IEEE80211_REASON_IE_INVALID; 1247 } 1248 if (len < 14) { 1249 IEEE80211_DISCARD_IE(vap, 1250 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1251 wh, "WPA", "too short, len %u", len); 1252 return IEEE80211_REASON_IE_INVALID; 1253 } 1254 frm += 6, len -= 4; /* NB: len is payload only */ 1255 /* NB: iswapoui already validated the OUI and type */ 1256 w = LE_READ_2(frm); 1257 if (w != WPA_VERSION) { 1258 IEEE80211_DISCARD_IE(vap, 1259 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1260 wh, "WPA", "bad version %u", w); 1261 return IEEE80211_REASON_IE_INVALID; 1262 } 1263 frm += 2, len -= 2; 1264 1265 memset(rsn, 0, sizeof(*rsn)); 1266 1267 /* multicast/group cipher */ 1268 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1269 frm += 4, len -= 4; 1270 1271 /* unicast ciphers */ 1272 n = LE_READ_2(frm); 1273 frm += 2, len -= 2; 1274 if (len < n*4+2) { 1275 IEEE80211_DISCARD_IE(vap, 1276 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1277 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1278 len, n); 1279 return IEEE80211_REASON_IE_INVALID; 1280 } 1281 w = 0; 1282 for (; n > 0; n--) { 1283 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1284 frm += 4, len -= 4; 1285 } 1286 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1287 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1288 else 1289 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1290 1291 /* key management algorithms */ 1292 n = LE_READ_2(frm); 1293 frm += 2, len -= 2; 1294 if (len < n*4) { 1295 IEEE80211_DISCARD_IE(vap, 1296 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1297 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1298 len, n); 1299 return IEEE80211_REASON_IE_INVALID; 1300 } 1301 w = 0; 1302 for (; n > 0; n--) { 1303 w |= wpa_keymgmt(frm); 1304 frm += 4, len -= 4; 1305 } 1306 if (w & WPA_ASE_8021X_UNSPEC) 1307 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1308 else 1309 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1310 1311 if (len > 2) /* optional capabilities */ 1312 rsn->rsn_caps = LE_READ_2(frm); 1313 1314 return 0; 1315} 1316 1317/* 1318 * Convert an RSN cipher selector OUI to an internal 1319 * cipher algorithm. Where appropriate we also 1320 * record any key length. 1321 */ 1322static int 1323rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1324{ 1325#define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1326 uint32_t w = LE_READ_4(sel); 1327 1328 switch (w) { 1329 case RSN_SEL(RSN_CSE_NULL): 1330 return IEEE80211_CIPHER_NONE; 1331 case RSN_SEL(RSN_CSE_WEP40): 1332 if (keylen) 1333 *keylen = 40 / NBBY; 1334 return IEEE80211_CIPHER_WEP; 1335 case RSN_SEL(RSN_CSE_WEP104): 1336 if (keylen) 1337 *keylen = 104 / NBBY; 1338 return IEEE80211_CIPHER_WEP; 1339 case RSN_SEL(RSN_CSE_TKIP): 1340 return IEEE80211_CIPHER_TKIP; 1341 case RSN_SEL(RSN_CSE_CCMP): 1342 return IEEE80211_CIPHER_AES_CCM; 1343 case RSN_SEL(RSN_CSE_WRAP): 1344 return IEEE80211_CIPHER_AES_OCB; 1345 } 1346 return 32; /* NB: so 1<< is discarded */ 1347#undef WPA_SEL 1348} 1349 1350/* 1351 * Convert an RSN key management/authentication algorithm 1352 * to an internal code. 1353 */ 1354static int 1355rsn_keymgmt(const uint8_t *sel) 1356{ 1357#define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1358 uint32_t w = LE_READ_4(sel); 1359 1360 switch (w) { 1361 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1362 return RSN_ASE_8021X_UNSPEC; 1363 case RSN_SEL(RSN_ASE_8021X_PSK): 1364 return RSN_ASE_8021X_PSK; 1365 case RSN_SEL(RSN_ASE_NONE): 1366 return RSN_ASE_NONE; 1367 } 1368 return 0; /* NB: so is discarded */ 1369#undef RSN_SEL 1370} 1371 1372/* 1373 * Parse a WPA/RSN information element to collect parameters 1374 * and validate the parameters against what has been 1375 * configured for the system. 1376 */ 1377static int 1378ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1379 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1380{ 1381 uint8_t len = frm[1]; 1382 uint32_t w; 1383 int n; 1384 1385 /* 1386 * Check the length once for fixed parts: 1387 * version, mcast cipher, and 2 selector counts. 1388 * Other, variable-length data, must be checked separately. 1389 */ 1390 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1391 IEEE80211_DISCARD_IE(vap, 1392 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1393 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1394 return IEEE80211_REASON_IE_INVALID; 1395 } 1396 if (len < 10) { 1397 IEEE80211_DISCARD_IE(vap, 1398 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1399 wh, "RSN", "too short, len %u", len); 1400 return IEEE80211_REASON_IE_INVALID; 1401 } 1402 frm += 2; 1403 w = LE_READ_2(frm); 1404 if (w != RSN_VERSION) { 1405 IEEE80211_DISCARD_IE(vap, 1406 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1407 wh, "RSN", "bad version %u", w); 1408 return IEEE80211_REASON_IE_INVALID; 1409 } 1410 frm += 2, len -= 2; 1411 1412 memset(rsn, 0, sizeof(*rsn)); 1413 1414 /* multicast/group cipher */ 1415 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1416 frm += 4, len -= 4; 1417 1418 /* unicast ciphers */ 1419 n = LE_READ_2(frm); 1420 frm += 2, len -= 2; 1421 if (len < n*4+2) { 1422 IEEE80211_DISCARD_IE(vap, 1423 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1424 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1425 len, n); 1426 return IEEE80211_REASON_IE_INVALID; 1427 } 1428 w = 0; 1429 for (; n > 0; n--) { 1430 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1431 frm += 4, len -= 4; 1432 } 1433 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1434 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1435 else 1436 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1437 1438 /* key management algorithms */ 1439 n = LE_READ_2(frm); 1440 frm += 2, len -= 2; 1441 if (len < n*4) { 1442 IEEE80211_DISCARD_IE(vap, 1443 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1444 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1445 len, n); 1446 return IEEE80211_REASON_IE_INVALID; 1447 } 1448 w = 0; 1449 for (; n > 0; n--) { 1450 w |= rsn_keymgmt(frm); 1451 frm += 4, len -= 4; 1452 } 1453 if (w & RSN_ASE_8021X_UNSPEC) 1454 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1455 else 1456 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1457 1458 /* optional RSN capabilities */ 1459 if (len > 2) 1460 rsn->rsn_caps = LE_READ_2(frm); 1461 /* XXXPMKID */ 1462 1463 return 0; 1464} 1465 1466/* 1467 * WPA/802.11i assocation request processing. 1468 */ 1469static int 1470wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1471 const struct ieee80211_frame *wh, const uint8_t *wpa, 1472 const uint8_t *rsn, uint16_t capinfo) 1473{ 1474 struct ieee80211vap *vap = ni->ni_vap; 1475 uint8_t reason; 1476 int badwparsn; 1477 1478 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1479 if (wpa == NULL && rsn == NULL) { 1480 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1481 /* 1482 * W-Fi Protected Setup (WPS) permits 1483 * clients to associate and pass EAPOL frames 1484 * to establish initial credentials. 1485 */ 1486 ni->ni_flags |= IEEE80211_NODE_WPS; 1487 return 1; 1488 } 1489 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1490 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1491 /* 1492 * Transitional Security Network. Permits clients 1493 * to associate and use WEP while WPA is configured. 1494 */ 1495 ni->ni_flags |= IEEE80211_NODE_TSN; 1496 return 1; 1497 } 1498 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1499 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1500 vap->iv_stats.is_rx_assoc_badwpaie++; 1501 reason = IEEE80211_REASON_IE_INVALID; 1502 goto bad; 1503 } 1504 /* assert right association security credentials */ 1505 badwparsn = 0; /* NB: to silence compiler */ 1506 switch (vap->iv_flags & IEEE80211_F_WPA) { 1507 case IEEE80211_F_WPA1: 1508 badwparsn = (wpa == NULL); 1509 break; 1510 case IEEE80211_F_WPA2: 1511 badwparsn = (rsn == NULL); 1512 break; 1513 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1514 badwparsn = (wpa == NULL && rsn == NULL); 1515 break; 1516 } 1517 if (badwparsn) { 1518 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1519 wh, NULL, 1520 "%s", "missing WPA/RSN IE in association request"); 1521 vap->iv_stats.is_rx_assoc_badwpaie++; 1522 reason = IEEE80211_REASON_IE_INVALID; 1523 goto bad; 1524 } 1525 /* 1526 * Parse WPA/RSN information element. 1527 */ 1528 if (wpa != NULL) 1529 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1530 else 1531 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1532 if (reason != 0) { 1533 /* XXX distinguish WPA/RSN? */ 1534 vap->iv_stats.is_rx_assoc_badwpaie++; 1535 goto bad; 1536 } 1537 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1538 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1539 wpa != NULL ? "WPA" : "RSN", 1540 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1541 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1542 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1543 1544 return 1; 1545bad: 1546 ieee80211_node_deauth(ni, reason); 1547 return 0; 1548} 1549 1550/* XXX find a better place for definition */ 1551struct l2_update_frame { 1552 struct ether_header eh; 1553 uint8_t dsap; 1554 uint8_t ssap; 1555 uint8_t control; 1556 uint8_t xid[3]; 1557} __packed; 1558 1559/* 1560 * Deliver a TGf L2UF frame on behalf of a station. 1561 * This primes any bridge when the station is roaming 1562 * between ap's on the same wired network. 1563 */ 1564static void 1565ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1566{ 1567 struct ieee80211vap *vap = ni->ni_vap; 1568 struct ifnet *ifp = vap->iv_ifp; 1569 struct mbuf *m; 1570 struct l2_update_frame *l2uf; 1571 struct ether_header *eh; 1572 1573 m = m_gethdr(M_NOWAIT, MT_DATA); 1574 if (m == NULL) { 1575 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1576 "%s", "no mbuf for l2uf frame"); 1577 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1578 return; 1579 } 1580 l2uf = mtod(m, struct l2_update_frame *); 1581 eh = &l2uf->eh; 1582 /* dst: Broadcast address */ 1583 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1584 /* src: associated STA */ 1585 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1586 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1587 1588 l2uf->dsap = 0; 1589 l2uf->ssap = 0; 1590 l2uf->control = 0xf5; 1591 l2uf->xid[0] = 0x81; 1592 l2uf->xid[1] = 0x80; 1593 l2uf->xid[2] = 0x00; 1594 1595 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1596 hostap_deliver_data(vap, ni, m); 1597} 1598 1599static void 1600ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1601 int reassoc, int resp, const char *tag, int rate) 1602{ 1603 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1604 "deny %s request, %s rate set mismatch, rate/MCS %d", 1605 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1606 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1607 ieee80211_node_leave(ni); 1608} 1609 1610static void 1611capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1612 int reassoc, int resp, const char *tag, int capinfo) 1613{ 1614 struct ieee80211vap *vap = ni->ni_vap; 1615 1616 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1617 "deny %s request, %s mismatch 0x%x", 1618 reassoc ? "reassoc" : "assoc", tag, capinfo); 1619 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1620 ieee80211_node_leave(ni); 1621 vap->iv_stats.is_rx_assoc_capmismatch++; 1622} 1623 1624static void 1625htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1626 int reassoc, int resp) 1627{ 1628 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1629 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1630 /* XXX no better code */ 1631 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1632 ieee80211_node_leave(ni); 1633} 1634 1635static void 1636authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1637 int algo, int seq, int status) 1638{ 1639 struct ieee80211vap *vap = ni->ni_vap; 1640 1641 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1642 wh, NULL, "unsupported alg %d", algo); 1643 vap->iv_stats.is_rx_auth_unsupported++; 1644 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1645 seq | (status << 16)); 1646} 1647 1648static __inline int 1649ishtmixed(const uint8_t *ie) 1650{ 1651 const struct ieee80211_ie_htinfo *ht = 1652 (const struct ieee80211_ie_htinfo *) ie; 1653 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1654 IEEE80211_HTINFO_OPMODE_MIXED; 1655} 1656 1657static int 1658is11bclient(const uint8_t *rates, const uint8_t *xrates) 1659{ 1660 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1661 int i; 1662 1663 /* NB: the 11b clients we care about will not have xrates */ 1664 if (xrates != NULL || rates == NULL) 1665 return 0; 1666 for (i = 0; i < rates[1]; i++) { 1667 int r = rates[2+i] & IEEE80211_RATE_VAL; 1668 if (r > 2*11 || ((1<<r) & brates) == 0) 1669 return 0; 1670 } 1671 return 1; 1672} 1673 1674static void 1675hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1676 int subtype, int rssi, int nf) 1677{ 1678 struct ieee80211vap *vap = ni->ni_vap; 1679 struct ieee80211com *ic = ni->ni_ic; 1680 struct ieee80211_frame *wh; 1681 uint8_t *frm, *efrm, *sfrm; 1682 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1683 int reassoc, resp; 1684 uint8_t rate; 1685 1686 wh = mtod(m0, struct ieee80211_frame *); 1687 frm = (uint8_t *)&wh[1]; 1688 efrm = mtod(m0, uint8_t *) + m0->m_len; 1689 switch (subtype) { 1690 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1691 case IEEE80211_FC0_SUBTYPE_BEACON: { 1692 struct ieee80211_scanparams scan; 1693 /* 1694 * We process beacon/probe response frames when scanning; 1695 * otherwise we check beacon frames for overlapping non-ERP 1696 * BSS in 11g and/or overlapping legacy BSS when in HT. 1697 */ 1698 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1699 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1700 vap->iv_stats.is_rx_mgtdiscard++; 1701 return; 1702 } 1703 /* NB: accept off-channel frames */ 1704 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1705 return; 1706 /* 1707 * Count frame now that we know it's to be processed. 1708 */ 1709 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1710 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1711 IEEE80211_NODE_STAT(ni, rx_beacons); 1712 } else 1713 IEEE80211_NODE_STAT(ni, rx_proberesp); 1714 /* 1715 * If scanning, just pass information to the scan module. 1716 */ 1717 if (ic->ic_flags & IEEE80211_F_SCAN) { 1718 if (scan.status == 0 && /* NB: on channel */ 1719 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1720 /* 1721 * Actively scanning a channel marked passive; 1722 * send a probe request now that we know there 1723 * is 802.11 traffic present. 1724 * 1725 * XXX check if the beacon we recv'd gives 1726 * us what we need and suppress the probe req 1727 */ 1728 ieee80211_probe_curchan(vap, 1); 1729 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1730 } 1731 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1732 return; 1733 } 1734 /* 1735 * Check beacon for overlapping bss w/ non ERP stations. 1736 * If we detect one and protection is configured but not 1737 * enabled, enable it and start a timer that'll bring us 1738 * out if we stop seeing the bss. 1739 */ 1740 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1741 scan.status == 0 && /* NB: on-channel */ 1742 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1743 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1744 ic->ic_lastnonerp = ticks; 1745 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1746 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1747 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1748 IEEE80211_NOTE_FRAME(vap, 1749 IEEE80211_MSG_ASSOC, wh, 1750 "non-ERP present on channel %d " 1751 "(saw erp 0x%x from channel %d), " 1752 "enable use of protection", 1753 ic->ic_curchan->ic_ieee, 1754 scan.erp, scan.chan); 1755 ic->ic_flags |= IEEE80211_F_USEPROT; 1756 ieee80211_notify_erp(ic); 1757 } 1758 } 1759 /* 1760 * Check beacon for non-HT station on HT channel 1761 * and update HT BSS occupancy as appropriate. 1762 */ 1763 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1764 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1765 /* 1766 * Off control channel; only check frames 1767 * that come in the extension channel when 1768 * operating w/ HT40. 1769 */ 1770 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1771 break; 1772 if (scan.chan != ic->ic_curchan->ic_extieee) 1773 break; 1774 } 1775 if (scan.htinfo == NULL) { 1776 ieee80211_htprot_update(ic, 1777 IEEE80211_HTINFO_OPMODE_PROTOPT | 1778 IEEE80211_HTINFO_NONHT_PRESENT); 1779 } else if (ishtmixed(scan.htinfo)) { 1780 /* XXX? take NONHT_PRESENT from beacon? */ 1781 ieee80211_htprot_update(ic, 1782 IEEE80211_HTINFO_OPMODE_MIXED | 1783 IEEE80211_HTINFO_NONHT_PRESENT); 1784 } 1785 } 1786 break; 1787 } 1788 1789 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1790 if (vap->iv_state != IEEE80211_S_RUN) { 1791 vap->iv_stats.is_rx_mgtdiscard++; 1792 return; 1793 } 1794 /* 1795 * prreq frame format 1796 * [tlv] ssid 1797 * [tlv] supported rates 1798 * [tlv] extended supported rates 1799 */ 1800 ssid = rates = xrates = NULL; 1801 sfrm = frm; 1802 while (efrm - frm > 1) { 1803 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1804 switch (*frm) { 1805 case IEEE80211_ELEMID_SSID: 1806 ssid = frm; 1807 break; 1808 case IEEE80211_ELEMID_RATES: 1809 rates = frm; 1810 break; 1811 case IEEE80211_ELEMID_XRATES: 1812 xrates = frm; 1813 break; 1814 } 1815 frm += frm[1] + 2; 1816 } 1817 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1818 if (xrates != NULL) 1819 IEEE80211_VERIFY_ELEMENT(xrates, 1820 IEEE80211_RATE_MAXSIZE - rates[1], return); 1821 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1822 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1823 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1824 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1825 wh, NULL, 1826 "%s", "no ssid with ssid suppression enabled"); 1827 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1828 return; 1829 } 1830 1831 /* XXX find a better class or define it's own */ 1832 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1833 "%s", "recv probe req"); 1834 /* 1835 * Some legacy 11b clients cannot hack a complete 1836 * probe response frame. When the request includes 1837 * only a bare-bones rate set, communicate this to 1838 * the transmit side. 1839 */ 1840 ieee80211_send_proberesp(vap, wh->i_addr2, 1841 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1842 break; 1843 1844 case IEEE80211_FC0_SUBTYPE_AUTH: { 1845 uint16_t algo, seq, status; 1846 1847 if (vap->iv_state != IEEE80211_S_RUN) { 1848 vap->iv_stats.is_rx_mgtdiscard++; 1849 return; 1850 } 1851 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1852 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1853 wh, NULL, "%s", "wrong bssid"); 1854 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1855 return; 1856 } 1857 /* 1858 * auth frame format 1859 * [2] algorithm 1860 * [2] sequence 1861 * [2] status 1862 * [tlv*] challenge 1863 */ 1864 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1865 algo = le16toh(*(uint16_t *)frm); 1866 seq = le16toh(*(uint16_t *)(frm + 2)); 1867 status = le16toh(*(uint16_t *)(frm + 4)); 1868 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1869 "recv auth frame with algorithm %d seq %d", algo, seq); 1870 /* 1871 * Consult the ACL policy module if setup. 1872 */ 1873 if (vap->iv_acl != NULL && 1874 !vap->iv_acl->iac_check(vap, wh->i_addr2)) { 1875 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1876 wh, NULL, "%s", "disallowed by ACL"); 1877 vap->iv_stats.is_rx_acl++; 1878 ieee80211_send_error(ni, wh->i_addr2, 1879 IEEE80211_FC0_SUBTYPE_AUTH, 1880 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1881 return; 1882 } 1883 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1884 IEEE80211_DISCARD(vap, 1885 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1886 wh, NULL, "%s", "TKIP countermeasures enabled"); 1887 vap->iv_stats.is_rx_auth_countermeasures++; 1888 ieee80211_send_error(ni, wh->i_addr2, 1889 IEEE80211_FC0_SUBTYPE_AUTH, 1890 IEEE80211_REASON_MIC_FAILURE); 1891 return; 1892 } 1893 if (algo == IEEE80211_AUTH_ALG_SHARED) 1894 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1895 seq, status); 1896 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1897 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1898 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1899 authalgreject(ni, wh, algo, 1900 seq+1, IEEE80211_STATUS_ALG); 1901 return; 1902 } else { 1903 /* 1904 * We assume that an unknown algorithm is the result 1905 * of a decryption failure on a shared key auth frame; 1906 * return a status code appropriate for that instead 1907 * of IEEE80211_STATUS_ALG. 1908 * 1909 * NB: a seq# of 4 is intentional; the decrypted 1910 * frame likely has a bogus seq value. 1911 */ 1912 authalgreject(ni, wh, algo, 1913 4, IEEE80211_STATUS_CHALLENGE); 1914 return; 1915 } 1916 break; 1917 } 1918 1919 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1920 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1921 uint16_t capinfo, lintval; 1922 struct ieee80211_rsnparms rsnparms; 1923 1924 if (vap->iv_state != IEEE80211_S_RUN) { 1925 vap->iv_stats.is_rx_mgtdiscard++; 1926 return; 1927 } 1928 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1929 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1930 wh, NULL, "%s", "wrong bssid"); 1931 vap->iv_stats.is_rx_assoc_bss++; 1932 return; 1933 } 1934 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1935 reassoc = 1; 1936 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1937 } else { 1938 reassoc = 0; 1939 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1940 } 1941 if (ni == vap->iv_bss) { 1942 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1943 "deny %s request, sta not authenticated", 1944 reassoc ? "reassoc" : "assoc"); 1945 ieee80211_send_error(ni, wh->i_addr2, 1946 IEEE80211_FC0_SUBTYPE_DEAUTH, 1947 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1948 vap->iv_stats.is_rx_assoc_notauth++; 1949 return; 1950 } 1951 1952 /* 1953 * asreq frame format 1954 * [2] capability information 1955 * [2] listen interval 1956 * [6*] current AP address (reassoc only) 1957 * [tlv] ssid 1958 * [tlv] supported rates 1959 * [tlv] extended supported rates 1960 * [tlv] WPA or RSN 1961 * [tlv] HT capabilities 1962 * [tlv] Atheros capabilities 1963 */ 1964 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1965 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1966 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1967 if (reassoc) 1968 frm += 6; /* ignore current AP info */ 1969 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1970 sfrm = frm; 1971 while (efrm - frm > 1) { 1972 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1973 switch (*frm) { 1974 case IEEE80211_ELEMID_SSID: 1975 ssid = frm; 1976 break; 1977 case IEEE80211_ELEMID_RATES: 1978 rates = frm; 1979 break; 1980 case IEEE80211_ELEMID_XRATES: 1981 xrates = frm; 1982 break; 1983 case IEEE80211_ELEMID_RSN: 1984 rsn = frm; 1985 break; 1986 case IEEE80211_ELEMID_HTCAP: 1987 htcap = frm; 1988 break; 1989 case IEEE80211_ELEMID_VENDOR: 1990 if (iswpaoui(frm)) 1991 wpa = frm; 1992 else if (iswmeinfo(frm)) 1993 wme = frm; 1994#ifdef IEEE80211_SUPPORT_SUPERG 1995 else if (isatherosoui(frm)) 1996 ath = frm; 1997#endif 1998 else if (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 1999 if (ishtcapoui(frm) && htcap == NULL) 2000 htcap = frm; 2001 } 2002 break; 2003 } 2004 frm += frm[1] + 2; 2005 } 2006 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2007 if (xrates != NULL) 2008 IEEE80211_VERIFY_ELEMENT(xrates, 2009 IEEE80211_RATE_MAXSIZE - rates[1], return); 2010 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2011 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2012 if (htcap != NULL) { 2013 IEEE80211_VERIFY_LENGTH(htcap[1], 2014 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2015 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2016 sizeof(struct ieee80211_ie_htcap)-2, 2017 return); /* XXX just NULL out? */ 2018 } 2019 2020 if ((vap->iv_flags & IEEE80211_F_WPA) && 2021 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2022 return; 2023 /* discard challenge after association */ 2024 if (ni->ni_challenge != NULL) { 2025 free(ni->ni_challenge, M_80211_NODE); 2026 ni->ni_challenge = NULL; 2027 } 2028 /* NB: 802.11 spec says to ignore station's privacy bit */ 2029 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2030 capinfomismatch(ni, wh, reassoc, resp, 2031 "capability", capinfo); 2032 return; 2033 } 2034 /* 2035 * Disallow re-associate w/ invalid slot time setting. 2036 */ 2037 if (ni->ni_associd != 0 && 2038 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2039 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2040 capinfomismatch(ni, wh, reassoc, resp, 2041 "slot time", capinfo); 2042 return; 2043 } 2044 rate = ieee80211_setup_rates(ni, rates, xrates, 2045 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2046 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2047 if (rate & IEEE80211_RATE_BASIC) { 2048 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2049 vap->iv_stats.is_rx_assoc_norate++; 2050 return; 2051 } 2052 /* 2053 * If constrained to 11g-only stations reject an 2054 * 11b-only station. We cheat a bit here by looking 2055 * at the max negotiated xmit rate and assuming anyone 2056 * with a best rate <24Mb/s is an 11b station. 2057 */ 2058 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2059 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2060 vap->iv_stats.is_rx_assoc_norate++; 2061 return; 2062 } 2063 /* 2064 * Do HT rate set handling and setup HT node state. 2065 */ 2066 ni->ni_chan = vap->iv_bss->ni_chan; 2067 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2068 rate = ieee80211_setup_htrates(ni, htcap, 2069 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2070 IEEE80211_F_DOBRS); 2071 if (rate & IEEE80211_RATE_BASIC) { 2072 ratesetmismatch(ni, wh, reassoc, resp, 2073 "HT", rate); 2074 vap->iv_stats.is_ht_assoc_norate++; 2075 return; 2076 } 2077 ieee80211_ht_node_init(ni); 2078 ieee80211_ht_updatehtcap(ni, htcap); 2079 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2080 ieee80211_ht_node_cleanup(ni); 2081#ifdef IEEE80211_SUPPORT_SUPERG 2082 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2083 ieee80211_ff_node_cleanup(ni); 2084#endif 2085 /* 2086 * Allow AMPDU operation only with unencrypted traffic 2087 * or AES-CCM; the 11n spec only specifies these ciphers 2088 * so permitting any others is undefined and can lead 2089 * to interoperability problems. 2090 */ 2091 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2092 (((vap->iv_flags & IEEE80211_F_WPA) && 2093 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2094 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2095 IEEE80211_NOTE(vap, 2096 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2097 "disallow HT use because WEP or TKIP requested, " 2098 "capinfo 0x%x ucastcipher %d", capinfo, 2099 rsnparms.rsn_ucastcipher); 2100 ieee80211_ht_node_cleanup(ni); 2101 vap->iv_stats.is_ht_assoc_downgrade++; 2102 } 2103 /* 2104 * If constrained to 11n-only stations reject legacy stations. 2105 */ 2106 if ((vap->iv_flags_ext & IEEE80211_FEXT_PUREN) && 2107 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2108 htcapmismatch(ni, wh, reassoc, resp); 2109 vap->iv_stats.is_ht_assoc_nohtcap++; 2110 return; 2111 } 2112 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2113 ni->ni_noise = nf; 2114 ni->ni_intval = lintval; 2115 ni->ni_capinfo = capinfo; 2116 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2117 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2118 /* 2119 * Store the IEs. 2120 * XXX maybe better to just expand 2121 */ 2122 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2123#define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2124 if (wpa != NULL) 2125 setie(wpa_ie, wpa - sfrm); 2126 if (rsn != NULL) 2127 setie(rsn_ie, rsn - sfrm); 2128 if (htcap != NULL) 2129 setie(htcap_ie, htcap - sfrm); 2130 if (wme != NULL) { 2131 setie(wme_ie, wme - sfrm); 2132 /* 2133 * Mark node as capable of QoS. 2134 */ 2135 ni->ni_flags |= IEEE80211_NODE_QOS; 2136 } else 2137 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2138#ifdef IEEE80211_SUPPORT_SUPERG 2139 if (ath != NULL) { 2140 setie(ath_ie, ath - sfrm); 2141 /* 2142 * Parse ATH station parameters. 2143 */ 2144 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2145 } else 2146#endif 2147 ni->ni_ath_flags = 0; 2148#undef setie 2149 } else { 2150 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2151 ni->ni_ath_flags = 0; 2152 } 2153 ieee80211_node_join(ni, resp); 2154 ieee80211_deliver_l2uf(ni); 2155 break; 2156 } 2157 2158 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2159 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2160 uint16_t reason; 2161 2162 if (vap->iv_state != IEEE80211_S_RUN || 2163 /* NB: can happen when in promiscuous mode */ 2164 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2165 vap->iv_stats.is_rx_mgtdiscard++; 2166 break; 2167 } 2168 /* 2169 * deauth/disassoc frame format 2170 * [2] reason 2171 */ 2172 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2173 reason = le16toh(*(uint16_t *)frm); 2174 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2175 vap->iv_stats.is_rx_deauth++; 2176 IEEE80211_NODE_STAT(ni, rx_deauth); 2177 } else { 2178 vap->iv_stats.is_rx_disassoc++; 2179 IEEE80211_NODE_STAT(ni, rx_disassoc); 2180 } 2181 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2182 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2183 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2184 if (ni != vap->iv_bss) 2185 ieee80211_node_leave(ni); 2186 break; 2187 } 2188 2189 case IEEE80211_FC0_SUBTYPE_ACTION: 2190 if (vap->iv_state == IEEE80211_S_RUN) { 2191 if (ieee80211_parse_action(ni, m0) == 0) 2192 ic->ic_recv_action(ni, frm, efrm); 2193 } else 2194 vap->iv_stats.is_rx_mgtdiscard++; 2195 break; 2196 2197 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2198 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2199 default: 2200 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2201 wh, "mgt", "subtype 0x%x not handled", subtype); 2202 vap->iv_stats.is_rx_badsubtype++; 2203 break; 2204 } 2205} 2206 2207static void 2208hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2209{ 2210 switch (subtype) { 2211 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2212 hostap_recv_pspoll(ni, m); 2213 break; 2214 case IEEE80211_FC0_SUBTYPE_BAR: 2215 ieee80211_recv_bar(ni, m); 2216 break; 2217 } 2218} 2219 2220/* 2221 * Process a received ps-poll frame. 2222 */ 2223static void 2224hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2225{ 2226 struct ieee80211vap *vap = ni->ni_vap; 2227 struct ieee80211_frame_min *wh; 2228 struct ifnet *ifp; 2229 struct mbuf *m; 2230 uint16_t aid; 2231 int qlen; 2232 2233 wh = mtod(m0, struct ieee80211_frame_min *); 2234 if (ni->ni_associd == 0) { 2235 IEEE80211_DISCARD(vap, 2236 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2237 (struct ieee80211_frame *) wh, NULL, 2238 "%s", "unassociated station"); 2239 vap->iv_stats.is_ps_unassoc++; 2240 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2241 IEEE80211_REASON_NOT_ASSOCED); 2242 return; 2243 } 2244 2245 aid = le16toh(*(uint16_t *)wh->i_dur); 2246 if (aid != ni->ni_associd) { 2247 IEEE80211_DISCARD(vap, 2248 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2249 (struct ieee80211_frame *) wh, NULL, 2250 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2251 ni->ni_associd, aid); 2252 vap->iv_stats.is_ps_badaid++; 2253 /* 2254 * NB: We used to deauth the station but it turns out 2255 * the Blackberry Curve 8230 (and perhaps other devices) 2256 * sometimes send the wrong AID when WME is negotiated. 2257 * Being more lenient here seems ok as we already check 2258 * the station is associated and we only return frames 2259 * queued for the station (i.e. we don't use the AID). 2260 */ 2261 return; 2262 } 2263 2264 /* Okay, take the first queued packet and put it out... */ 2265 m = ieee80211_node_psq_dequeue(ni, &qlen); 2266 if (m == NULL) { 2267 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2268 "%s", "recv ps-poll, but queue empty"); 2269 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2270 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2271 if (vap->iv_set_tim != NULL) 2272 vap->iv_set_tim(ni, 0); /* just in case */ 2273 return; 2274 } 2275 /* 2276 * If there are more packets, set the more packets bit 2277 * in the packet dispatched to the station; otherwise 2278 * turn off the TIM bit. 2279 */ 2280 if (qlen != 0) { 2281 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2282 "recv ps-poll, send packet, %u still queued", qlen); 2283 m->m_flags |= M_MORE_DATA; 2284 } else { 2285 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2286 "%s", "recv ps-poll, send packet, queue empty"); 2287 if (vap->iv_set_tim != NULL) 2288 vap->iv_set_tim(ni, 0); 2289 } 2290 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2291 2292 if (m->m_flags & M_ENCAP) 2293 ifp = vap->iv_ic->ic_ifp; 2294 else 2295 ifp = vap->iv_ifp; 2296 IF_ENQUEUE(&ifp->if_snd, m); 2297 if_start(ifp); 2298} 2299