2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
26 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
32 * IEEE 802.11 Station mode support.
37 #include <sys/param.h>
38 #include <sys/systm.h>
40 #include <sys/malloc.h>
41 #include <sys/kernel.h>
43 #include <sys/socket.h>
44 #include <sys/sockio.h>
45 #include <sys/endian.h>
46 #include <sys/errno.h>
48 #include <sys/sysctl.h>
51 #include <net/if_media.h>
52 #include <net/if_llc.h>
53 #include <net/ethernet.h>
57 #include <net80211/ieee80211_var.h>
58 #include <net80211/ieee80211_sta.h>
59 #include <net80211/ieee80211_input.h>
60 #ifdef IEEE80211_SUPPORT_SUPERG
61 #include <net80211/ieee80211_superg.h>
63 #include <net80211/ieee80211_ratectl.h>
65 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
67 static void sta_vattach(struct ieee80211vap *);
68 static void sta_beacon_miss(struct ieee80211vap *);
69 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
70 static int sta_input(struct ieee80211_node *, struct mbuf *, int, int);
71 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
72 int subtype, int rssi, int nf);
73 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
76 ieee80211_sta_attach(struct ieee80211com *ic)
78 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
82 ieee80211_sta_detach(struct ieee80211com *ic)
87 sta_vdetach(struct ieee80211vap *vap)
92 sta_vattach(struct ieee80211vap *vap)
94 vap->iv_newstate = sta_newstate;
95 vap->iv_input = sta_input;
96 vap->iv_recv_mgmt = sta_recv_mgmt;
97 vap->iv_recv_ctl = sta_recv_ctl;
98 vap->iv_opdetach = sta_vdetach;
99 vap->iv_bmiss = sta_beacon_miss;
103 * Handle a beacon miss event. The common code filters out
104 * spurious events that can happen when scanning and/or before
105 * reaching RUN state.
108 sta_beacon_miss(struct ieee80211vap *vap)
110 struct ieee80211com *ic = vap->iv_ic;
112 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
113 KASSERT(vap->iv_state >= IEEE80211_S_RUN,
114 ("wrong state %s", ieee80211_state_name[vap->iv_state]));
116 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
117 "beacon miss, mode %s state %s\n",
118 ieee80211_opmode_name[vap->iv_opmode],
119 ieee80211_state_name[vap->iv_state]);
121 if (vap->iv_state == IEEE80211_S_CSA) {
123 * A Channel Switch is pending; assume we missed the
124 * beacon that would've completed the process and just
125 * force the switch. If we made a mistake we'll not
126 * find the AP on the new channel and fall back to a
129 ieee80211_csa_completeswitch(ic);
132 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
134 * Send a directed probe req before falling back to a
135 * scan; if we receive a response ic_bmiss_count will
136 * be reset. Some cards mistakenly report beacon miss
137 * so this avoids the expensive scan if the ap is
140 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
141 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
142 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
146 callout_stop(&vap->iv_swbmiss);
147 vap->iv_bmiss_count = 0;
148 vap->iv_stats.is_beacon_miss++;
149 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
150 #ifdef IEEE80211_SUPPORT_SUPERG
151 struct ieee80211com *ic = vap->iv_ic;
154 * If we receive a beacon miss interrupt when using
155 * dynamic turbo, attempt to switch modes before
158 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
159 ieee80211_dturbo_switch(vap,
160 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
163 * Try to reassociate before scanning for a new ap.
165 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
168 * Somebody else is controlling state changes (e.g.
169 * a user-mode app) don't do anything that would
170 * confuse them; just drop into scan mode so they'll
171 * notified of the state change and given control.
173 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
178 * Handle deauth with reason. We retry only for
179 * the cases where we might succeed. Otherwise
180 * we downgrade the ap and scan.
183 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
186 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */
187 case IEEE80211_STATUS_TIMEOUT:
188 case IEEE80211_REASON_ASSOC_EXPIRE:
189 case IEEE80211_REASON_NOT_AUTHED:
190 case IEEE80211_REASON_NOT_ASSOCED:
191 case IEEE80211_REASON_ASSOC_LEAVE:
192 case IEEE80211_REASON_ASSOC_NOT_AUTHED:
193 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
196 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
197 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
198 ieee80211_check_scan_current(vap);
204 * IEEE80211_M_STA vap state machine handler.
205 * This routine handles the main states in the 802.11 protocol.
208 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
210 struct ieee80211com *ic = vap->iv_ic;
211 struct ieee80211_node *ni;
212 enum ieee80211_state ostate;
214 IEEE80211_LOCK_ASSERT(ic);
216 ostate = vap->iv_state;
217 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
218 __func__, ieee80211_state_name[ostate],
219 ieee80211_state_name[nstate], arg);
220 vap->iv_state = nstate; /* state transition */
221 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */
222 if (ostate != IEEE80211_S_SCAN)
223 ieee80211_cancel_scan(vap); /* background scan */
224 ni = vap->iv_bss; /* NB: no reference held */
225 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
226 callout_stop(&vap->iv_swbmiss);
228 case IEEE80211_S_INIT:
230 case IEEE80211_S_SLEEP:
232 case IEEE80211_S_RUN:
233 IEEE80211_SEND_MGMT(ni,
234 IEEE80211_FC0_SUBTYPE_DISASSOC,
235 IEEE80211_REASON_ASSOC_LEAVE);
236 ieee80211_sta_leave(ni);
238 case IEEE80211_S_ASSOC:
239 IEEE80211_SEND_MGMT(ni,
240 IEEE80211_FC0_SUBTYPE_DEAUTH,
241 IEEE80211_REASON_AUTH_LEAVE);
243 case IEEE80211_S_SCAN:
244 ieee80211_cancel_scan(vap);
249 if (ostate != IEEE80211_S_INIT) {
250 /* NB: optimize INIT -> INIT case */
251 ieee80211_reset_bss(vap);
253 if (vap->iv_auth->ia_detach != NULL)
254 vap->iv_auth->ia_detach(vap);
256 case IEEE80211_S_SCAN:
258 case IEEE80211_S_INIT:
260 * Initiate a scan. We can come here as a result
261 * of an IEEE80211_IOC_SCAN_REQ too in which case
262 * the vap will be marked with IEEE80211_FEXT_SCANREQ
263 * and the scan request parameters will be present
264 * in iv_scanreq. Otherwise we do the default.
266 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
267 ieee80211_check_scan(vap,
268 vap->iv_scanreq_flags,
269 vap->iv_scanreq_duration,
270 vap->iv_scanreq_mindwell,
271 vap->iv_scanreq_maxdwell,
272 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
273 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
275 ieee80211_check_scan_current(vap);
277 case IEEE80211_S_SCAN:
278 case IEEE80211_S_AUTH:
279 case IEEE80211_S_ASSOC:
281 * These can happen either because of a timeout
282 * on an assoc/auth response or because of a
283 * change in state that requires a reset. For
284 * the former we're called with a non-zero arg
285 * that is the cause for the failure; pass this
286 * to the scan code so it can update state.
287 * Otherwise trigger a new scan unless we're in
288 * manual roaming mode in which case an application
289 * must issue an explicit scan request.
292 ieee80211_scan_assoc_fail(vap,
293 vap->iv_bss->ni_macaddr, arg);
294 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
295 ieee80211_check_scan_current(vap);
297 case IEEE80211_S_RUN: /* beacon miss */
299 * Beacon miss. Notify user space and if not
300 * under control of a user application (roaming
301 * manual) kick off a scan to re-connect.
303 ieee80211_sta_leave(ni);
304 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
305 ieee80211_check_scan_current(vap);
311 case IEEE80211_S_AUTH:
313 case IEEE80211_S_INIT:
314 case IEEE80211_S_SCAN:
315 IEEE80211_SEND_MGMT(ni,
316 IEEE80211_FC0_SUBTYPE_AUTH, 1);
318 case IEEE80211_S_AUTH:
319 case IEEE80211_S_ASSOC:
320 switch (arg & 0xff) {
321 case IEEE80211_FC0_SUBTYPE_AUTH:
323 IEEE80211_SEND_MGMT(ni,
324 IEEE80211_FC0_SUBTYPE_AUTH, 2);
326 case IEEE80211_FC0_SUBTYPE_DEAUTH:
327 sta_authretry(vap, ni, arg>>8);
331 case IEEE80211_S_RUN:
332 switch (arg & 0xff) {
333 case IEEE80211_FC0_SUBTYPE_AUTH:
334 IEEE80211_SEND_MGMT(ni,
335 IEEE80211_FC0_SUBTYPE_AUTH, 2);
336 vap->iv_state = ostate; /* stay RUN */
338 case IEEE80211_FC0_SUBTYPE_DEAUTH:
339 ieee80211_sta_leave(ni);
340 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
342 IEEE80211_SEND_MGMT(ni,
343 IEEE80211_FC0_SUBTYPE_AUTH, 1);
352 case IEEE80211_S_ASSOC:
354 case IEEE80211_S_AUTH:
355 case IEEE80211_S_ASSOC:
356 IEEE80211_SEND_MGMT(ni,
357 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
359 case IEEE80211_S_SLEEP: /* cannot happen */
360 case IEEE80211_S_RUN:
361 ieee80211_sta_leave(ni);
362 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
363 IEEE80211_SEND_MGMT(ni, arg ?
364 IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
365 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
372 case IEEE80211_S_RUN:
373 if (vap->iv_flags & IEEE80211_F_WPA) {
374 /* XXX validate prerequisites */
377 case IEEE80211_S_RUN:
378 case IEEE80211_S_CSA:
380 case IEEE80211_S_AUTH: /* when join is done in fw */
381 case IEEE80211_S_ASSOC:
382 #ifdef IEEE80211_DEBUG
383 if (ieee80211_msg_debug(vap)) {
384 ieee80211_note(vap, "%s with %s ssid ",
385 (vap->iv_opmode == IEEE80211_M_STA ?
386 "associated" : "synchronized"),
387 ether_sprintf(ni->ni_bssid));
388 ieee80211_print_essid(vap->iv_bss->ni_essid,
391 printf(" channel %d start %uMb\n",
392 ieee80211_chan2ieee(ic, ic->ic_curchan),
393 IEEE80211_RATE2MBS(ni->ni_txrate));
396 ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
397 ieee80211_notify_node_join(ni,
398 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
400 case IEEE80211_S_SLEEP:
401 ieee80211_sta_pwrsave(vap, 0);
406 ieee80211_sync_curchan(ic);
407 if (ostate != IEEE80211_S_RUN &&
408 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
410 * Start s/w beacon miss timer for devices w/o
411 * hardware support. We fudge a bit here since
412 * we're doing this in software.
414 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
415 2 * vap->iv_bmissthreshold * ni->ni_intval);
416 vap->iv_swbmiss_count = 0;
417 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
418 ieee80211_swbmiss, vap);
421 * When 802.1x is not in use mark the port authorized
422 * at this point so traffic can flow.
424 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
425 ieee80211_node_authorize(ni);
427 * Fake association when joining an existing bss.
429 if (ic->ic_newassoc != NULL)
430 ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN);
432 case IEEE80211_S_CSA:
433 if (ostate != IEEE80211_S_RUN)
436 case IEEE80211_S_SLEEP:
437 ieee80211_sta_pwrsave(vap, 1);
441 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
442 "%s: unexpected state transition %s -> %s\n", __func__,
443 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
450 * Return non-zero if the frame is an echo of a multicast
451 * frame sent by ourself. The dir is known to be DSTODS.
454 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
456 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh)
457 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh)
460 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
462 if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
464 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
465 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
471 * Return non-zero if the frame is an echo of a multicast
472 * frame sent by ourself. The dir is known to be FROMDS.
475 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
477 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
479 if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
481 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
485 * Decide if a received management frame should be
486 * printed when debugging is enabled. This filters some
487 * of the less interesting frames that come frequently
491 doprint(struct ieee80211vap *vap, int subtype)
494 case IEEE80211_FC0_SUBTYPE_BEACON:
495 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
496 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
503 * Process a received frame. The node associated with the sender
504 * should be supplied. If nothing was found in the node table then
505 * the caller is assumed to supply a reference to iv_bss instead.
506 * The RSSI and a timestamp are also supplied. The RSSI data is used
507 * during AP scanning to select a AP to associate with; it can have
508 * any units so long as values have consistent units and higher values
509 * mean ``better signal''. The receive timestamp is currently not used
510 * by the 802.11 layer.
513 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
515 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
516 #define HAS_SEQ(type) ((type & 0x4) == 0)
517 struct ieee80211vap *vap = ni->ni_vap;
518 struct ieee80211com *ic = ni->ni_ic;
519 struct ifnet *ifp = vap->iv_ifp;
520 struct ieee80211_frame *wh;
521 struct ieee80211_key *key;
522 struct ether_header *eh;
523 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
524 uint8_t dir, type, subtype, qos;
528 if (m->m_flags & M_AMPDU_MPDU) {
530 * Fastpath for A-MPDU reorder q resubmission. Frames
531 * w/ M_AMPDU_MPDU marked have already passed through
532 * here but were received out of order and been held on
533 * the reorder queue. When resubmitted they are marked
534 * with the M_AMPDU_MPDU flag and we can bypass most of
535 * the normal processing.
537 wh = mtod(m, struct ieee80211_frame *);
538 type = IEEE80211_FC0_TYPE_DATA;
539 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
540 subtype = IEEE80211_FC0_SUBTYPE_QOS;
541 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
545 KASSERT(ni != NULL, ("null node"));
546 ni->ni_inact = ni->ni_inact_reload;
548 type = -1; /* undefined */
550 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
551 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
552 ni->ni_macaddr, NULL,
553 "too short (1): len %u", m->m_pkthdr.len);
554 vap->iv_stats.is_rx_tooshort++;
558 * Bit of a cheat here, we use a pointer for a 3-address
559 * frame format but don't reference fields past outside
560 * ieee80211_frame_min w/o first validating the data is
563 wh = mtod(m, struct ieee80211_frame *);
565 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
566 IEEE80211_FC0_VERSION_0) {
567 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
568 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
569 wh->i_fc[0], wh->i_fc[1]);
570 vap->iv_stats.is_rx_badversion++;
574 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
575 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
576 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
577 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
579 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
580 /* not interested in */
581 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
582 bssid, NULL, "%s", "not to bss");
583 vap->iv_stats.is_rx_wrongbss++;
586 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
588 if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
589 uint8_t tid = ieee80211_gettid(wh);
590 if (IEEE80211_QOS_HAS_SEQ(wh) &&
591 TID_TO_WME_AC(tid) >= WME_AC_VI)
592 ic->ic_wme.wme_hipri_traffic++;
593 rxseq = le16toh(*(uint16_t *)wh->i_seq);
594 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
595 (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
596 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
597 /* duplicate, discard */
598 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
600 "seqno <%u,%u> fragno <%u,%u> tid %u",
601 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
602 ni->ni_rxseqs[tid] >>
603 IEEE80211_SEQ_SEQ_SHIFT,
604 rxseq & IEEE80211_SEQ_FRAG_MASK,
606 IEEE80211_SEQ_FRAG_MASK,
608 vap->iv_stats.is_rx_dup++;
609 IEEE80211_NODE_STAT(ni, rx_dup);
612 ni->ni_rxseqs[tid] = rxseq;
617 case IEEE80211_FC0_TYPE_DATA:
618 hdrspace = ieee80211_hdrspace(ic, wh);
619 if (m->m_len < hdrspace &&
620 (m = m_pullup(m, hdrspace)) == NULL) {
621 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
622 ni->ni_macaddr, NULL,
623 "data too short: expecting %u", hdrspace);
624 vap->iv_stats.is_rx_tooshort++;
628 * Handle A-MPDU re-ordering. If the frame is to be
629 * processed directly then ieee80211_ampdu_reorder
630 * will return 0; otherwise it has consumed the mbuf
631 * and we should do nothing more with it.
633 if ((m->m_flags & M_AMPDU) &&
634 (dir == IEEE80211_FC1_DIR_FROMDS ||
635 dir == IEEE80211_FC1_DIR_DSTODS) &&
636 ieee80211_ampdu_reorder(ni, m) != 0) {
641 if (dir == IEEE80211_FC1_DIR_FROMDS) {
642 if ((ifp->if_flags & IFF_SIMPLEX) &&
643 isfromds_mcastecho(vap, wh)) {
645 * In IEEE802.11 network, multicast
646 * packets sent from "me" are broadcast
647 * from the AP; silently discard for
650 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
651 wh, "data", "%s", "multicast echo");
652 vap->iv_stats.is_rx_mcastecho++;
655 if ((vap->iv_flags & IEEE80211_F_DWDS) &&
656 IEEE80211_IS_MULTICAST(wh->i_addr1)) {
658 * DWDS sta's must drop 3-address mcast frames
659 * as they will be sent separately as a 4-addr
660 * frame. Accepting the 3-addr frame will
661 * confuse the bridge into thinking the sending
662 * sta is located at the end of WDS link.
664 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
665 "3-address data", "%s", "DWDS enabled");
666 vap->iv_stats.is_rx_mcastecho++;
669 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
670 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
671 IEEE80211_DISCARD(vap,
672 IEEE80211_MSG_INPUT, wh, "4-address data",
673 "%s", "DWDS not enabled");
674 vap->iv_stats.is_rx_wrongdir++;
677 if ((ifp->if_flags & IFF_SIMPLEX) &&
678 isdstods_mcastecho(vap, wh)) {
680 * In IEEE802.11 network, multicast
681 * packets sent from "me" are broadcast
682 * from the AP; silently discard for
685 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
686 "4-address data", "%s", "multicast echo");
687 vap->iv_stats.is_rx_mcastecho++;
691 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
692 "data", "incorrect dir 0x%x", dir);
693 vap->iv_stats.is_rx_wrongdir++;
698 * Handle privacy requirements. Note that we
699 * must not be preempted from here until after
700 * we (potentially) call ieee80211_crypto_demic;
701 * otherwise we may violate assumptions in the
702 * crypto cipher modules used to do delayed update
703 * of replay sequence numbers.
705 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
706 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
708 * Discard encrypted frames when privacy is off.
710 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
711 wh, "WEP", "%s", "PRIVACY off");
712 vap->iv_stats.is_rx_noprivacy++;
713 IEEE80211_NODE_STAT(ni, rx_noprivacy);
716 key = ieee80211_crypto_decap(ni, m, hdrspace);
718 /* NB: stats+msgs handled in crypto_decap */
719 IEEE80211_NODE_STAT(ni, rx_wepfail);
722 wh = mtod(m, struct ieee80211_frame *);
723 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
725 /* XXX M_WEP and IEEE80211_F_PRIVACY */
730 * Save QoS bits for use below--before we strip the header.
732 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
733 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
734 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
735 ((struct ieee80211_qosframe *)wh)->i_qos[0];
740 * Next up, any fragmentation.
742 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
743 m = ieee80211_defrag(ni, m, hdrspace);
745 /* Fragment dropped or frame not complete yet */
749 wh = NULL; /* no longer valid, catch any uses */
752 * Next strip any MSDU crypto bits.
754 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
755 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
756 ni->ni_macaddr, "data", "%s", "demic error");
757 vap->iv_stats.is_rx_demicfail++;
758 IEEE80211_NODE_STAT(ni, rx_demicfail);
762 /* copy to listener after decrypt */
763 if (ieee80211_radiotap_active_vap(vap))
764 ieee80211_radiotap_rx(vap, m);
768 * Finally, strip the 802.11 header.
770 m = ieee80211_decap(vap, m, hdrspace);
772 /* XXX mask bit to check for both */
773 /* don't count Null data frames as errors */
774 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
775 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
777 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
778 ni->ni_macaddr, "data", "%s", "decap error");
779 vap->iv_stats.is_rx_decap++;
780 IEEE80211_NODE_STAT(ni, rx_decap);
783 eh = mtod(m, struct ether_header *);
784 if (!ieee80211_node_is_authorized(ni)) {
786 * Deny any non-PAE frames received prior to
787 * authorization. For open/shared-key
788 * authentication the port is mark authorized
789 * after authentication completes. For 802.1x
790 * the port is not marked authorized by the
791 * authenticator until the handshake has completed.
793 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
794 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
795 eh->ether_shost, "data",
796 "unauthorized port: ether type 0x%x len %u",
797 eh->ether_type, m->m_pkthdr.len);
798 vap->iv_stats.is_rx_unauth++;
799 IEEE80211_NODE_STAT(ni, rx_unauth);
804 * When denying unencrypted frames, discard
805 * any non-PAE frames received without encryption.
807 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
808 (key == NULL && (m->m_flags & M_WEP) == 0) &&
809 eh->ether_type != htons(ETHERTYPE_PAE)) {
811 * Drop unencrypted frames.
813 vap->iv_stats.is_rx_unencrypted++;
814 IEEE80211_NODE_STAT(ni, rx_unencrypted);
818 /* XXX require HT? */
819 if (qos & IEEE80211_QOS_AMSDU) {
820 m = ieee80211_decap_amsdu(ni, m);
822 return IEEE80211_FC0_TYPE_DATA;
824 #ifdef IEEE80211_SUPPORT_SUPERG
825 m = ieee80211_decap_fastframe(vap, ni, m);
827 return IEEE80211_FC0_TYPE_DATA;
830 ieee80211_deliver_data(vap, ni, m);
831 return IEEE80211_FC0_TYPE_DATA;
833 case IEEE80211_FC0_TYPE_MGT:
834 vap->iv_stats.is_rx_mgmt++;
835 IEEE80211_NODE_STAT(ni, rx_mgmt);
836 if (dir != IEEE80211_FC1_DIR_NODS) {
837 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
838 wh, "data", "incorrect dir 0x%x", dir);
839 vap->iv_stats.is_rx_wrongdir++;
842 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
843 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
844 ni->ni_macaddr, "mgt", "too short: len %u",
846 vap->iv_stats.is_rx_tooshort++;
849 #ifdef IEEE80211_DEBUG
850 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
851 ieee80211_msg_dumppkts(vap)) {
852 if_printf(ifp, "received %s from %s rssi %d\n",
853 ieee80211_mgt_subtype_name[subtype >>
854 IEEE80211_FC0_SUBTYPE_SHIFT],
855 ether_sprintf(wh->i_addr2), rssi);
858 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
859 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
861 * Only shared key auth frames with a challenge
862 * should be encrypted, discard all others.
864 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
865 wh, ieee80211_mgt_subtype_name[subtype >>
866 IEEE80211_FC0_SUBTYPE_SHIFT],
867 "%s", "WEP set but not permitted");
868 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
871 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
873 * Discard encrypted frames when privacy is off.
875 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
876 wh, "mgt", "%s", "WEP set but PRIVACY off");
877 vap->iv_stats.is_rx_noprivacy++;
880 hdrspace = ieee80211_hdrspace(ic, wh);
881 key = ieee80211_crypto_decap(ni, m, hdrspace);
883 /* NB: stats+msgs handled in crypto_decap */
886 wh = mtod(m, struct ieee80211_frame *);
887 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
889 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
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);
899 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
900 wh, NULL, "bad frame type 0x%x", type);
901 /* should not come here */
908 if (need_tap && ieee80211_radiotap_active_vap(vap))
909 ieee80211_radiotap_rx(vap, m);
917 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
918 int rssi, int nf, uint16_t seq, uint16_t status)
920 struct ieee80211vap *vap = ni->ni_vap;
922 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
923 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
924 ni->ni_macaddr, "open auth",
925 "bad sta auth mode %u", ni->ni_authmode);
926 vap->iv_stats.is_rx_bad_auth++; /* XXX */
929 if (vap->iv_state != IEEE80211_S_AUTH ||
930 seq != IEEE80211_AUTH_OPEN_RESPONSE) {
931 vap->iv_stats.is_rx_bad_auth++;
935 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
936 ni, "open auth failed (reason %d)", status);
937 vap->iv_stats.is_rx_auth_fail++;
938 vap->iv_stats.is_rx_authfail_code = status;
939 ieee80211_new_state(vap, IEEE80211_S_SCAN,
940 IEEE80211_SCAN_FAIL_STATUS);
942 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
946 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
947 uint8_t *frm, uint8_t *efrm, int rssi, int nf,
948 uint16_t seq, uint16_t status)
950 struct ieee80211vap *vap = ni->ni_vap;
955 * NB: this can happen as we allow pre-shared key
956 * authentication to be enabled w/o wep being turned
957 * on so that configuration of these can be done
958 * in any order. It may be better to enforce the
959 * ordering in which case this check would just be
960 * for sanity/consistency.
962 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
963 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
964 ni->ni_macaddr, "shared key auth",
965 "%s", " PRIVACY is disabled");
966 estatus = IEEE80211_STATUS_ALG;
970 * Pre-shared key authentication is evil; accept
971 * it only if explicitly configured (it is supported
972 * mainly for compatibility with clients like OS X).
974 if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
975 ni->ni_authmode != IEEE80211_AUTH_SHARED) {
976 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
977 ni->ni_macaddr, "shared key auth",
978 "bad sta auth mode %u", ni->ni_authmode);
979 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
980 estatus = IEEE80211_STATUS_ALG;
985 if (frm + 1 < efrm) {
986 if ((frm[1] + 2) > (efrm - frm)) {
987 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
988 ni->ni_macaddr, "shared key auth",
990 frm[0], (frm[1] + 2) - (efrm - frm));
991 vap->iv_stats.is_rx_bad_auth++;
992 estatus = IEEE80211_STATUS_CHALLENGE;
995 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1000 case IEEE80211_AUTH_SHARED_CHALLENGE:
1001 case IEEE80211_AUTH_SHARED_RESPONSE:
1002 if (challenge == NULL) {
1003 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1004 ni->ni_macaddr, "shared key auth",
1005 "%s", "no challenge");
1006 vap->iv_stats.is_rx_bad_auth++;
1007 estatus = IEEE80211_STATUS_CHALLENGE;
1010 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1011 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1012 ni->ni_macaddr, "shared key auth",
1013 "bad challenge len %d", challenge[1]);
1014 vap->iv_stats.is_rx_bad_auth++;
1015 estatus = IEEE80211_STATUS_CHALLENGE;
1021 if (vap->iv_state != IEEE80211_S_AUTH)
1024 case IEEE80211_AUTH_SHARED_PASS:
1025 if (ni->ni_challenge != NULL) {
1026 free(ni->ni_challenge, M_80211_NODE);
1027 ni->ni_challenge = NULL;
1030 IEEE80211_NOTE_FRAME(vap,
1031 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1032 "shared key auth failed (reason %d)", status);
1033 vap->iv_stats.is_rx_auth_fail++;
1034 vap->iv_stats.is_rx_authfail_code = status;
1037 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1039 case IEEE80211_AUTH_SHARED_CHALLENGE:
1040 if (!ieee80211_alloc_challenge(ni))
1042 /* XXX could optimize by passing recvd challenge */
1043 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1044 IEEE80211_SEND_MGMT(ni,
1045 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1048 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1049 wh, "shared key auth", "bad seq %d", seq);
1050 vap->iv_stats.is_rx_bad_auth++;
1056 * Kick the state machine. This short-circuits
1057 * using the mgt frame timeout to trigger the
1060 if (vap->iv_state == IEEE80211_S_AUTH)
1061 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1062 IEEE80211_SCAN_FAIL_STATUS);
1066 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1067 const struct ieee80211_frame *wh)
1069 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
1070 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1071 u_int len = frm[1], qosinfo;
1074 if (len < sizeof(struct ieee80211_wme_param)-2) {
1075 IEEE80211_DISCARD_IE(vap,
1076 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1077 wh, "WME", "too short, len %u", len);
1080 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1081 qosinfo &= WME_QOSINFO_COUNT;
1082 /* XXX do proper check for wraparound */
1083 if (qosinfo == wme->wme_wmeChanParams.cap_info)
1085 frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1086 for (i = 0; i < WME_NUM_AC; i++) {
1087 struct wmeParams *wmep =
1088 &wme->wme_wmeChanParams.cap_wmeParams[i];
1089 /* NB: ACI not used */
1090 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
1091 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
1092 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
1093 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
1094 wmep->wmep_txopLimit = LE_READ_2(frm+2);
1097 wme->wme_wmeChanParams.cap_info = qosinfo;
1103 * Process 11h Channel Switch Announcement (CSA) ie. If this
1104 * is the first CSA then initiate the switch. Otherwise we
1105 * track state and trigger completion and/or cancel of the switch.
1106 * XXX should be public for IBSS use
1109 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1110 const struct ieee80211_frame *wh)
1112 struct ieee80211com *ic = vap->iv_ic;
1113 const struct ieee80211_csa_ie *csa =
1114 (const struct ieee80211_csa_ie *) frm;
1116 KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1117 ("state %s", ieee80211_state_name[vap->iv_state]));
1119 if (csa->csa_mode > 1) {
1120 IEEE80211_DISCARD_IE(vap,
1121 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1122 wh, "CSA", "invalid mode %u", csa->csa_mode);
1126 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1128 * Convert the channel number to a channel reference. We
1129 * try first to preserve turbo attribute of the current
1130 * channel then fallback. Note this will not work if the
1131 * CSA specifies a channel that requires a band switch (e.g.
1132 * 11a => 11g). This is intentional as 11h is defined only
1133 * for 5GHz/11a and because the switch does not involve a
1134 * reassociation, protocol state (capabilities, negotated
1135 * rates, etc) may/will be wrong.
1137 struct ieee80211_channel *c =
1138 ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1139 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1141 c = ieee80211_find_channel_byieee(ic,
1143 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1145 IEEE80211_DISCARD_IE(vap,
1146 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1147 wh, "CSA", "invalid channel %u",
1152 #if IEEE80211_CSA_COUNT_MIN > 0
1153 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1155 * Require at least IEEE80211_CSA_COUNT_MIN count to
1156 * reduce the risk of being redirected by a fabricated
1157 * CSA. If a valid CSA is dropped we'll still get a
1158 * beacon miss when the AP leaves the channel so we'll
1159 * eventually follow to the new channel.
1161 * NOTE: this violates the 11h spec that states that
1162 * count may be any value and if 0 then a switch
1163 * should happen asap.
1165 IEEE80211_DISCARD_IE(vap,
1166 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1167 wh, "CSA", "count %u too small, must be >= %u",
1168 csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1172 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1175 * Validate this ie against the initial CSA. We require
1176 * mode and channel not change and the count must be
1177 * monotonically decreasing. This may be pointless and
1178 * canceling the switch as a result may be too paranoid but
1179 * in the worst case if we drop out of CSA because of this
1180 * and the AP does move then we'll just end up taking a
1181 * beacon miss and scan to find the AP.
1183 * XXX may want <= on count as we also process ProbeResp
1184 * frames and those may come in w/ the same count as the
1185 * previous beacon; but doing so leaves us open to a stuck
1186 * count until we add a dead-man timer
1188 if (!(csa->csa_count < ic->ic_csa_count &&
1189 csa->csa_mode == ic->ic_csa_mode &&
1190 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1191 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1192 "CSA ie mismatch, initial ie <%d,%d,%d>, "
1193 "this ie <%d,%d,%d>", ic->ic_csa_mode,
1194 ic->ic_csa_newchan, ic->ic_csa_count,
1195 csa->csa_mode, csa->csa_newchan, csa->csa_count);
1196 ieee80211_csa_cancelswitch(ic);
1198 if (csa->csa_count <= 1)
1199 ieee80211_csa_completeswitch(ic);
1201 ic->ic_csa_count = csa->csa_count;
1205 IEEE80211_UNLOCK(ic);
1209 * Return non-zero if a background scan may be continued:
1210 * o bg scan is active
1211 * o no channel switch is pending
1212 * o there has not been any traffic recently
1214 * Note we do not check if there is an administrative enable;
1215 * this is only done to start the scan. We assume that any
1216 * change in state will be accompanied by a request to cancel
1217 * active scans which will otherwise cause this test to fail.
1220 contbgscan(struct ieee80211vap *vap)
1222 struct ieee80211com *ic = vap->iv_ic;
1224 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1225 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1226 vap->iv_state == IEEE80211_S_RUN && /* XXX? */
1227 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1231 * Return non-zero if a backgrond scan may be started:
1232 * o bg scanning is administratively enabled
1233 * o no channel switch is pending
1234 * o we are not boosted on a dynamic turbo channel
1235 * o there has not been a scan recently
1236 * o there has not been any traffic recently
1239 startbgscan(struct ieee80211vap *vap)
1241 struct ieee80211com *ic = vap->iv_ic;
1243 return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1244 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1245 #ifdef IEEE80211_SUPPORT_SUPERG
1246 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1248 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1249 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1253 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1254 int subtype, int rssi, int nf)
1256 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1257 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1258 struct ieee80211vap *vap = ni->ni_vap;
1259 struct ieee80211com *ic = ni->ni_ic;
1260 struct ieee80211_frame *wh;
1261 uint8_t *frm, *efrm;
1262 uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1265 wh = mtod(m0, struct ieee80211_frame *);
1266 frm = (uint8_t *)&wh[1];
1267 efrm = mtod(m0, uint8_t *) + m0->m_len;
1269 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1270 case IEEE80211_FC0_SUBTYPE_BEACON: {
1271 struct ieee80211_scanparams scan;
1273 * We process beacon/probe response frames:
1274 * o when scanning, or
1275 * o station mode when associated (to collect state
1276 * updates such as 802.11g slot time)
1277 * Frames otherwise received are discarded.
1279 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1280 vap->iv_stats.is_rx_mgtdiscard++;
1283 /* XXX probe response in sta mode when !scanning? */
1284 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
1287 * Count frame now that we know it's to be processed.
1289 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1290 vap->iv_stats.is_rx_beacon++; /* XXX remove */
1291 IEEE80211_NODE_STAT(ni, rx_beacons);
1293 IEEE80211_NODE_STAT(ni, rx_proberesp);
1295 * When operating in station mode, check for state updates.
1296 * Be careful to ignore beacons received while doing a
1297 * background scan. We consider only 11g/WMM stuff right now.
1299 if (ni->ni_associd != 0 &&
1300 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1301 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1302 /* record tsf of last beacon */
1303 memcpy(ni->ni_tstamp.data, scan.tstamp,
1304 sizeof(ni->ni_tstamp));
1305 /* count beacon frame for s/w bmiss handling */
1306 vap->iv_swbmiss_count++;
1307 vap->iv_bmiss_count = 0;
1308 if (ni->ni_erp != scan.erp) {
1309 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1311 "erp change: was 0x%x, now 0x%x",
1312 ni->ni_erp, scan.erp);
1313 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1314 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1315 ic->ic_flags |= IEEE80211_F_USEPROT;
1317 ic->ic_flags &= ~IEEE80211_F_USEPROT;
1318 ni->ni_erp = scan.erp;
1320 /* XXX driver notification */
1322 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1323 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1325 "capabilities change: was 0x%x, now 0x%x",
1326 ni->ni_capinfo, scan.capinfo);
1328 * NB: we assume short preamble doesn't
1329 * change dynamically
1331 ieee80211_set_shortslottime(ic,
1332 IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1333 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1334 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1335 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1338 if (scan.wme != NULL &&
1339 (ni->ni_flags & IEEE80211_NODE_QOS) &&
1340 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
1341 ieee80211_wme_updateparams(vap);
1342 #ifdef IEEE80211_SUPPORT_SUPERG
1343 if (scan.ath != NULL)
1344 ieee80211_parse_athparams(ni, scan.ath, wh);
1346 if (scan.htcap != NULL && scan.htinfo != NULL &&
1347 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1348 ieee80211_ht_updateparams(ni,
1349 scan.htcap, scan.htinfo);
1350 /* XXX state changes? */
1352 if (scan.tim != NULL) {
1353 struct ieee80211_tim_ie *tim =
1354 (struct ieee80211_tim_ie *) scan.tim;
1356 int aid = IEEE80211_AID(ni->ni_associd);
1357 int ix = aid / NBBY;
1358 int min = tim->tim_bitctl &~ 1;
1359 int max = tim->tim_len + min - 4;
1360 if ((tim->tim_bitctl&1) ||
1361 (min <= ix && ix <= max &&
1362 isset(tim->tim_bitmap - min, aid))) {
1364 * XXX Do not let bg scan kick off
1365 * we are expecting data.
1367 ic->ic_lastdata = ticks;
1368 ieee80211_sta_pwrsave(vap, 0);
1371 ni->ni_dtim_count = tim->tim_count;
1372 ni->ni_dtim_period = tim->tim_period;
1374 if (scan.csa != NULL &&
1375 (vap->iv_flags & IEEE80211_F_DOTH))
1376 ieee80211_parse_csaparams(vap, scan.csa, wh);
1377 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1379 * No CSA ie or 11h disabled, but a channel
1380 * switch is pending; drop out so we aren't
1381 * stuck in CSA state. If the AP really is
1382 * moving we'll get a beacon miss and scan.
1385 ieee80211_csa_cancelswitch(ic);
1386 IEEE80211_UNLOCK(ic);
1389 * If scanning, pass the info to the scan module.
1390 * Otherwise, check if it's the right time to do
1391 * a background scan. Background scanning must
1392 * be enabled and we must not be operating in the
1393 * turbo phase of dynamic turbo mode. Then,
1394 * it's been a while since the last background
1395 * scan and if no data frames have come through
1396 * recently, kick off a scan. Note that this
1397 * is the mechanism by which a background scan
1398 * is started _and_ continued each time we
1399 * return on-channel to receive a beacon from
1402 if (ic->ic_flags & IEEE80211_F_SCAN) {
1403 ieee80211_add_scan(vap, &scan, wh,
1405 } else if (contbgscan(vap)) {
1406 ieee80211_bg_scan(vap, 0);
1407 } else if (startbgscan(vap)) {
1408 vap->iv_stats.is_scan_bg++;
1410 /* wakeup if we are sleeing */
1411 ieee80211_set_pwrsave(vap, 0);
1413 ieee80211_bg_scan(vap, 0);
1418 * If scanning, just pass information to the scan module.
1420 if (ic->ic_flags & IEEE80211_F_SCAN) {
1421 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1423 * Actively scanning a channel marked passive;
1424 * send a probe request now that we know there
1425 * is 802.11 traffic present.
1427 * XXX check if the beacon we recv'd gives
1428 * us what we need and suppress the probe req
1430 ieee80211_probe_curchan(vap, 1);
1431 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1433 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1439 case IEEE80211_FC0_SUBTYPE_AUTH: {
1440 uint16_t algo, seq, status;
1448 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1449 algo = le16toh(*(uint16_t *)frm);
1450 seq = le16toh(*(uint16_t *)(frm + 2));
1451 status = le16toh(*(uint16_t *)(frm + 4));
1452 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1453 "recv auth frame with algorithm %d seq %d", algo, seq);
1455 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1456 IEEE80211_DISCARD(vap,
1457 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1458 wh, "auth", "%s", "TKIP countermeasures enabled");
1459 vap->iv_stats.is_rx_auth_countermeasures++;
1460 if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1461 ieee80211_send_error(ni, wh->i_addr2,
1462 IEEE80211_FC0_SUBTYPE_AUTH,
1463 IEEE80211_REASON_MIC_FAILURE);
1467 if (algo == IEEE80211_AUTH_ALG_SHARED)
1468 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1470 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1471 sta_auth_open(ni, wh, rssi, nf, seq, status);
1473 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1474 wh, "auth", "unsupported alg %d", algo);
1475 vap->iv_stats.is_rx_auth_unsupported++;
1481 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1482 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1483 uint16_t capinfo, associd;
1486 if (vap->iv_state != IEEE80211_S_ASSOC) {
1487 vap->iv_stats.is_rx_mgtdiscard++;
1492 * asresp frame format
1493 * [2] capability information
1495 * [2] association ID
1496 * [tlv] supported rates
1497 * [tlv] extended supported rates
1499 * [tlv] HT capabilities
1502 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1504 capinfo = le16toh(*(uint16_t *)frm);
1506 status = le16toh(*(uint16_t *)frm);
1509 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1510 wh->i_addr2, "%sassoc failed (reason %d)",
1511 ISREASSOC(subtype) ? "re" : "", status);
1512 vap->iv_stats.is_rx_auth_fail++; /* XXX */
1515 associd = le16toh(*(uint16_t *)frm);
1518 rates = xrates = wme = htcap = htinfo = NULL;
1519 while (efrm - frm > 1) {
1520 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1522 case IEEE80211_ELEMID_RATES:
1525 case IEEE80211_ELEMID_XRATES:
1528 case IEEE80211_ELEMID_HTCAP:
1531 case IEEE80211_ELEMID_HTINFO:
1534 case IEEE80211_ELEMID_VENDOR:
1537 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1539 * Accept pre-draft HT ie's if the
1540 * standard ones have not been seen.
1542 if (ishtcapoui(frm)) {
1545 } else if (ishtinfooui(frm)) {
1550 /* XXX Atheros OUI support */
1556 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1558 IEEE80211_VERIFY_ELEMENT(xrates,
1559 IEEE80211_RATE_MAXSIZE - rates[1], return);
1560 rate = ieee80211_setup_rates(ni, rates, xrates,
1562 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1563 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1564 if (rate & IEEE80211_RATE_BASIC) {
1565 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1567 "%sassoc failed (rate set mismatch)",
1568 ISREASSOC(subtype) ? "re" : "");
1569 vap->iv_stats.is_rx_assoc_norate++;
1570 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1571 IEEE80211_SCAN_FAIL_STATUS);
1575 ni->ni_capinfo = capinfo;
1576 ni->ni_associd = associd;
1577 if (ni->ni_jointime == 0)
1578 ni->ni_jointime = time_uptime;
1580 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
1581 ni->ni_flags |= IEEE80211_NODE_QOS;
1582 ieee80211_wme_updateparams(vap);
1584 ni->ni_flags &= ~IEEE80211_NODE_QOS;
1586 * Setup HT state according to the negotiation.
1588 * NB: shouldn't need to check if HT use is enabled but some
1589 * ap's send back HT ie's even when we don't indicate we
1590 * are HT capable in our AssocReq.
1592 if (htcap != NULL && htinfo != NULL &&
1593 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1594 ieee80211_ht_node_init(ni);
1595 ieee80211_ht_updateparams(ni, htcap, htinfo);
1596 ieee80211_setup_htrates(ni, htcap,
1597 IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1598 ieee80211_setup_basic_htrates(ni, htinfo);
1599 ieee80211_node_setuptxparms(ni);
1600 ieee80211_ratectl_node_init(ni);
1602 #ifdef IEEE80211_SUPPORT_SUPERG
1603 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH))
1604 ieee80211_ff_node_init(ni);
1608 * Configure state now that we are associated.
1610 * XXX may need different/additional driver callbacks?
1612 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1613 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1614 ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
1615 ic->ic_flags &= ~IEEE80211_F_USEBARKER;
1617 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
1618 ic->ic_flags |= IEEE80211_F_USEBARKER;
1620 ieee80211_set_shortslottime(ic,
1621 IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1622 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1624 * Honor ERP protection.
1626 * NB: ni_erp should zero for non-11g operation.
1628 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1629 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1630 ic->ic_flags |= IEEE80211_F_USEPROT;
1632 ic->ic_flags &= ~IEEE80211_F_USEPROT;
1633 IEEE80211_NOTE_MAC(vap,
1634 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1635 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
1636 ISREASSOC(subtype) ? "re" : "",
1637 IEEE80211_NODE_AID(ni),
1638 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1639 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1640 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1641 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1642 ni->ni_flags & IEEE80211_NODE_HT ?
1643 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1644 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1645 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1646 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1647 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1648 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1649 ", fast-frames" : "",
1650 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1653 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1657 case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1660 if (vap->iv_state == IEEE80211_S_SCAN) {
1661 vap->iv_stats.is_rx_mgtdiscard++;
1664 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1665 /* NB: can happen when in promiscuous mode */
1666 vap->iv_stats.is_rx_mgtdiscard++;
1671 * deauth frame format
1674 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1675 reason = le16toh(*(uint16_t *)frm);
1677 vap->iv_stats.is_rx_deauth++;
1678 vap->iv_stats.is_rx_deauth_code = reason;
1679 IEEE80211_NODE_STAT(ni, rx_deauth);
1681 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1682 "recv deauthenticate (reason %d)", reason);
1683 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1684 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1688 case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1691 if (vap->iv_state != IEEE80211_S_RUN &&
1692 vap->iv_state != IEEE80211_S_ASSOC &&
1693 vap->iv_state != IEEE80211_S_AUTH) {
1694 vap->iv_stats.is_rx_mgtdiscard++;
1697 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1698 /* NB: can happen when in promiscuous mode */
1699 vap->iv_stats.is_rx_mgtdiscard++;
1704 * disassoc frame format
1707 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1708 reason = le16toh(*(uint16_t *)frm);
1710 vap->iv_stats.is_rx_disassoc++;
1711 vap->iv_stats.is_rx_disassoc_code = reason;
1712 IEEE80211_NODE_STAT(ni, rx_disassoc);
1714 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1715 "recv disassociate (reason %d)", reason);
1716 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1720 case IEEE80211_FC0_SUBTYPE_ACTION:
1721 if (vap->iv_state == IEEE80211_S_RUN) {
1722 if (ieee80211_parse_action(ni, m0) == 0)
1723 ic->ic_recv_action(ni, wh, frm, efrm);
1725 vap->iv_stats.is_rx_mgtdiscard++;
1728 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1729 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1730 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1731 vap->iv_stats.is_rx_mgtdiscard++;
1734 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1735 wh, "mgt", "subtype 0x%x not handled", subtype);
1736 vap->iv_stats.is_rx_badsubtype++;
1744 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1747 case IEEE80211_FC0_SUBTYPE_BAR:
1748 ieee80211_recv_bar(ni, m);