1 /*-
2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 #ifdef __FreeBSD__
28 __FBSDID("$FreeBSD$");
29 #endif
30
31 /*
32 * IEEE 802.11 Station 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_sta.h>
59 #include <net80211/ieee80211_input.h>
60 #ifdef IEEE80211_SUPPORT_SUPERG
61 #include <net80211/ieee80211_superg.h>
62 #endif
63 #include <net80211/ieee80211_ratectl.h>
64
65 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
66
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);
74
75 void
76 ieee80211_sta_attach(struct ieee80211com *ic)
77 {
78 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
79 }
80
81 void
82 ieee80211_sta_detach(struct ieee80211com *ic)
83 {
84 }
85
86 static void
87 sta_vdetach(struct ieee80211vap *vap)
88 {
89 }
90
91 static void
92 sta_vattach(struct ieee80211vap *vap)
93 {
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;
100 }
101
102 /*
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.
106 */
107 static void
108 sta_beacon_miss(struct ieee80211vap *vap)
109 {
110 struct ieee80211com *ic = vap->iv_ic;
111
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]));
115
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]);
120
121 if (vap->iv_state == IEEE80211_S_CSA) {
122 /*
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
127 * normal scan.
128 */
129 ieee80211_csa_completeswitch(ic);
130 return;
131 }
132 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
133 /*
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
138 * still there.
139 */
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);
143 return;
144 }
145
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;
152
153 /*
154 * If we receive a beacon miss interrupt when using
155 * dynamic turbo, attempt to switch modes before
156 * reassociating.
157 */
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);
161 #endif
162 /*
163 * Try to reassociate before scanning for a new ap.
164 */
165 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
166 } else {
167 /*
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.
172 */
173 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
174 }
175 }
176
177 /*
178 * Handle deauth with reason. We retry only for
179 * the cases where we might succeed. Otherwise
180 * we downgrade the ap and scan.
181 */
182 static void
183 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
184 {
185 switch (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);
194 break;
195 default:
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);
199 break;
200 }
201 }
202
203 /*
204 * IEEE80211_M_STA vap state machine handler.
205 * This routine handles the main states in the 802.11 protocol.
206 */
207 static int
208 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
209 {
210 struct ieee80211com *ic = vap->iv_ic;
211 struct ieee80211_node *ni;
212 enum ieee80211_state ostate;
213
214 IEEE80211_LOCK_ASSERT(ic);
215
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);
227 switch (nstate) {
228 case IEEE80211_S_INIT:
229 switch (ostate) {
230 case IEEE80211_S_SLEEP:
231 /* XXX wakeup */
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);
237 break;
238 case IEEE80211_S_ASSOC:
239 IEEE80211_SEND_MGMT(ni,
240 IEEE80211_FC0_SUBTYPE_DEAUTH,
241 IEEE80211_REASON_AUTH_LEAVE);
242 break;
243 case IEEE80211_S_SCAN:
244 ieee80211_cancel_scan(vap);
245 break;
246 default:
247 goto invalid;
248 }
249 if (ostate != IEEE80211_S_INIT) {
250 /* NB: optimize INIT -> INIT case */
251 ieee80211_reset_bss(vap);
252 }
253 if (vap->iv_auth->ia_detach != NULL)
254 vap->iv_auth->ia_detach(vap);
255 break;
256 case IEEE80211_S_SCAN:
257 switch (ostate) {
258 case IEEE80211_S_INIT:
259 /*
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.
265 */
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;
274 } else
275 ieee80211_check_scan_current(vap);
276 break;
277 case IEEE80211_S_SCAN:
278 case IEEE80211_S_AUTH:
279 case IEEE80211_S_ASSOC:
280 /*
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.
290 */
291 if (arg != 0)
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);
296 break;
297 case IEEE80211_S_RUN: /* beacon miss */
298 /*
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.
302 */
303 ieee80211_sta_leave(ni);
304 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
305 ieee80211_check_scan_current(vap);
306 break;
307 default:
308 goto invalid;
309 }
310 break;
311 case IEEE80211_S_AUTH:
312 switch (ostate) {
313 case IEEE80211_S_INIT:
314 case IEEE80211_S_SCAN:
315 IEEE80211_SEND_MGMT(ni,
316 IEEE80211_FC0_SUBTYPE_AUTH, 1);
317 break;
318 case IEEE80211_S_AUTH:
319 case IEEE80211_S_ASSOC:
320 switch (arg & 0xff) {
321 case IEEE80211_FC0_SUBTYPE_AUTH:
322 /* ??? */
323 IEEE80211_SEND_MGMT(ni,
324 IEEE80211_FC0_SUBTYPE_AUTH, 2);
325 break;
326 case IEEE80211_FC0_SUBTYPE_DEAUTH:
327 sta_authretry(vap, ni, arg>>8);
328 break;
329 }
330 break;
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 */
337 break;
338 case IEEE80211_FC0_SUBTYPE_DEAUTH:
339 ieee80211_sta_leave(ni);
340 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
341 /* try to reauth */
342 IEEE80211_SEND_MGMT(ni,
343 IEEE80211_FC0_SUBTYPE_AUTH, 1);
344 }
345 break;
346 }
347 break;
348 default:
349 goto invalid;
350 }
351 break;
352 case IEEE80211_S_ASSOC:
353 switch (ostate) {
354 case IEEE80211_S_AUTH:
355 case IEEE80211_S_ASSOC:
356 IEEE80211_SEND_MGMT(ni,
357 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
358 break;
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);
366 }
367 break;
368 default:
369 goto invalid;
370 }
371 break;
372 case IEEE80211_S_RUN:
373 if (vap->iv_flags & IEEE80211_F_WPA) {
374 /* XXX validate prerequisites */
375 }
376 switch (ostate) {
377 case IEEE80211_S_RUN:
378 case IEEE80211_S_CSA:
379 break;
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,
389 ni->ni_esslen);
390 /* XXX MCS/HT */
391 printf(" channel %d start %uMb\n",
392 ieee80211_chan2ieee(ic, ic->ic_curchan),
393 IEEE80211_RATE2MBS(ni->ni_txrate));
394 }
395 #endif
396 ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
397 ieee80211_notify_node_join(ni,
398 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
399 break;
400 case IEEE80211_S_SLEEP:
401 ieee80211_sta_pwrsave(vap, 0);
402 break;
403 default:
404 goto invalid;
405 }
406 ieee80211_sync_curchan(ic);
407 if (ostate != IEEE80211_S_RUN &&
408 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
409 /*
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.
413 */
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);
419 }
420 /*
421 * When 802.1x is not in use mark the port authorized
422 * at this point so traffic can flow.
423 */
424 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
425 ieee80211_node_authorize(ni);
426 /*
427 * Fake association when joining an existing bss.
428 */
429 if (ic->ic_newassoc != NULL)
430 ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN);
431 break;
432 case IEEE80211_S_CSA:
433 if (ostate != IEEE80211_S_RUN)
434 goto invalid;
435 break;
436 case IEEE80211_S_SLEEP:
437 ieee80211_sta_pwrsave(vap, 1);
438 break;
439 default:
440 invalid:
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]);
444 break;
445 }
446 return 0;
447 }
448
449 /*
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.
452 */
453 static __inline int
454 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
455 {
456 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh)
457 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh)
458 const uint8_t *sa;
459
460 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
461
462 if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
463 return 0;
464 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
465 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
466 #undef WH4
467 #undef QWH4
468 }
469
470 /*
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.
473 */
474 static __inline int
475 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
476 {
477 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
478
479 if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
480 return 0;
481 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
482 }
483
484 /*
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
488 * (e.g. beacons).
489 */
490 static __inline int
491 doprint(struct ieee80211vap *vap, int subtype)
492 {
493 switch (subtype) {
494 case IEEE80211_FC0_SUBTYPE_BEACON:
495 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
496 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
497 return 0;
498 }
499 return 1;
500 }
501
502 /*
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.
511 */
512 static int
513 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
514 {
515 #define HAS_SEQ(type) ((type & 0x4) == 0)
516 struct ieee80211vap *vap = ni->ni_vap;
517 struct ieee80211com *ic = ni->ni_ic;
518 struct ifnet *ifp = vap->iv_ifp;
519 struct ieee80211_frame *wh;
520 struct ieee80211_key *key;
521 struct ether_header *eh;
522 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
523 uint8_t dir, type, subtype, qos;
524 uint8_t *bssid;
525 uint16_t rxseq;
526
527 if (m->m_flags & M_AMPDU_MPDU) {
528 /*
529 * Fastpath for A-MPDU reorder q resubmission. Frames
530 * w/ M_AMPDU_MPDU marked have already passed through
531 * here but were received out of order and been held on
532 * the reorder queue. When resubmitted they are marked
533 * with the M_AMPDU_MPDU flag and we can bypass most of
534 * the normal processing.
535 */
536 wh = mtod(m, struct ieee80211_frame *);
537 type = IEEE80211_FC0_TYPE_DATA;
538 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
539 subtype = IEEE80211_FC0_SUBTYPE_QOS;
540 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
541 goto resubmit_ampdu;
542 }
543
544 KASSERT(ni != NULL, ("null node"));
545 ni->ni_inact = ni->ni_inact_reload;
546
547 type = -1; /* undefined */
548
549 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
550 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
551 ni->ni_macaddr, NULL,
552 "too short (1): len %u", m->m_pkthdr.len);
553 vap->iv_stats.is_rx_tooshort++;
554 goto out;
555 }
556 /*
557 * Bit of a cheat here, we use a pointer for a 3-address
558 * frame format but don't reference fields past outside
559 * ieee80211_frame_min w/o first validating the data is
560 * present.
561 */
562 wh = mtod(m, struct ieee80211_frame *);
563
564 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
565 IEEE80211_FC0_VERSION_0) {
566 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
567 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
568 wh->i_fc[0], wh->i_fc[1]);
569 vap->iv_stats.is_rx_badversion++;
570 goto err;
571 }
572
573 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
574 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
575 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
576 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
577 bssid = wh->i_addr2;
578 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
579 /* not interested in */
580 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
581 bssid, NULL, "%s", "not to bss");
582 vap->iv_stats.is_rx_wrongbss++;
583 goto out;
584 }
585 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
586 ni->ni_noise = nf;
587 if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
588 uint8_t tid = ieee80211_gettid(wh);
589 if (IEEE80211_QOS_HAS_SEQ(wh) &&
590 TID_TO_WME_AC(tid) >= WME_AC_VI)
591 ic->ic_wme.wme_hipri_traffic++;
592 rxseq = le16toh(*(uint16_t *)wh->i_seq);
593 if (! ieee80211_check_rxseq(ni, wh)) {
594 /* duplicate, discard */
595 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
596 bssid, "duplicate",
597 "seqno <%u,%u> fragno <%u,%u> tid %u",
598 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
599 ni->ni_rxseqs[tid] >>
600 IEEE80211_SEQ_SEQ_SHIFT,
601 rxseq & IEEE80211_SEQ_FRAG_MASK,
602 ni->ni_rxseqs[tid] &
603 IEEE80211_SEQ_FRAG_MASK,
604 tid);
605 vap->iv_stats.is_rx_dup++;
606 IEEE80211_NODE_STAT(ni, rx_dup);
607 goto out;
608 }
609 ni->ni_rxseqs[tid] = rxseq;
610 }
611 }
612
613 switch (type) {
614 case IEEE80211_FC0_TYPE_DATA:
615 hdrspace = ieee80211_hdrspace(ic, wh);
616 if (m->m_len < hdrspace &&
617 (m = m_pullup(m, hdrspace)) == NULL) {
618 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
619 ni->ni_macaddr, NULL,
620 "data too short: expecting %u", hdrspace);
621 vap->iv_stats.is_rx_tooshort++;
622 goto out; /* XXX */
623 }
624 /*
625 * Handle A-MPDU re-ordering. If the frame is to be
626 * processed directly then ieee80211_ampdu_reorder
627 * will return 0; otherwise it has consumed the mbuf
628 * and we should do nothing more with it.
629 */
630 if ((m->m_flags & M_AMPDU) &&
631 (dir == IEEE80211_FC1_DIR_FROMDS ||
632 dir == IEEE80211_FC1_DIR_DSTODS) &&
633 ieee80211_ampdu_reorder(ni, m) != 0) {
634 m = NULL;
635 goto out;
636 }
637 resubmit_ampdu:
638 if (dir == IEEE80211_FC1_DIR_FROMDS) {
639 if ((ifp->if_flags & IFF_SIMPLEX) &&
640 isfromds_mcastecho(vap, wh)) {
641 /*
642 * In IEEE802.11 network, multicast
643 * packets sent from "me" are broadcast
644 * from the AP; silently discard for
645 * SIMPLEX interface.
646 */
647 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
648 wh, "data", "%s", "multicast echo");
649 vap->iv_stats.is_rx_mcastecho++;
650 goto out;
651 }
652 if ((vap->iv_flags & IEEE80211_F_DWDS) &&
653 IEEE80211_IS_MULTICAST(wh->i_addr1)) {
654 /*
655 * DWDS sta's must drop 3-address mcast frames
656 * as they will be sent separately as a 4-addr
657 * frame. Accepting the 3-addr frame will
658 * confuse the bridge into thinking the sending
659 * sta is located at the end of WDS link.
660 */
661 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
662 "3-address data", "%s", "DWDS enabled");
663 vap->iv_stats.is_rx_mcastecho++;
664 goto out;
665 }
666 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
667 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
668 IEEE80211_DISCARD(vap,
669 IEEE80211_MSG_INPUT, wh, "4-address data",
670 "%s", "DWDS not enabled");
671 vap->iv_stats.is_rx_wrongdir++;
672 goto out;
673 }
674 if ((ifp->if_flags & IFF_SIMPLEX) &&
675 isdstods_mcastecho(vap, wh)) {
676 /*
677 * In IEEE802.11 network, multicast
678 * packets sent from "me" are broadcast
679 * from the AP; silently discard for
680 * SIMPLEX interface.
681 */
682 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
683 "4-address data", "%s", "multicast echo");
684 vap->iv_stats.is_rx_mcastecho++;
685 goto out;
686 }
687 } else {
688 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
689 "data", "incorrect dir 0x%x", dir);
690 vap->iv_stats.is_rx_wrongdir++;
691 goto out;
692 }
693
694 /*
695 * Handle privacy requirements. Note that we
696 * must not be preempted from here until after
697 * we (potentially) call ieee80211_crypto_demic;
698 * otherwise we may violate assumptions in the
699 * crypto cipher modules used to do delayed update
700 * of replay sequence numbers.
701 */
702 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
703 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
704 /*
705 * Discard encrypted frames when privacy is off.
706 */
707 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
708 wh, "WEP", "%s", "PRIVACY off");
709 vap->iv_stats.is_rx_noprivacy++;
710 IEEE80211_NODE_STAT(ni, rx_noprivacy);
711 goto out;
712 }
713 key = ieee80211_crypto_decap(ni, m, hdrspace);
714 if (key == NULL) {
715 /* NB: stats+msgs handled in crypto_decap */
716 IEEE80211_NODE_STAT(ni, rx_wepfail);
717 goto out;
718 }
719 wh = mtod(m, struct ieee80211_frame *);
720 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
721 } else {
722 /* XXX M_WEP and IEEE80211_F_PRIVACY */
723 key = NULL;
724 }
725
726 /*
727 * Save QoS bits for use below--before we strip the header.
728 */
729 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
730 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
731 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
732 ((struct ieee80211_qosframe *)wh)->i_qos[0];
733 } else
734 qos = 0;
735
736 /*
737 * Next up, any fragmentation.
738 */
739 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
740 m = ieee80211_defrag(ni, m, hdrspace);
741 if (m == NULL) {
742 /* Fragment dropped or frame not complete yet */
743 goto out;
744 }
745 }
746 wh = NULL; /* no longer valid, catch any uses */
747
748 /*
749 * Next strip any MSDU crypto bits.
750 */
751 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
752 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
753 ni->ni_macaddr, "data", "%s", "demic error");
754 vap->iv_stats.is_rx_demicfail++;
755 IEEE80211_NODE_STAT(ni, rx_demicfail);
756 goto out;
757 }
758
759 /* copy to listener after decrypt */
760 if (ieee80211_radiotap_active_vap(vap))
761 ieee80211_radiotap_rx(vap, m);
762 need_tap = 0;
763
764 /*
765 * Finally, strip the 802.11 header.
766 */
767 m = ieee80211_decap(vap, m, hdrspace);
768 if (m == NULL) {
769 /* XXX mask bit to check for both */
770 /* don't count Null data frames as errors */
771 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
772 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
773 goto out;
774 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
775 ni->ni_macaddr, "data", "%s", "decap error");
776 vap->iv_stats.is_rx_decap++;
777 IEEE80211_NODE_STAT(ni, rx_decap);
778 goto err;
779 }
780 eh = mtod(m, struct ether_header *);
781 if (!ieee80211_node_is_authorized(ni)) {
782 /*
783 * Deny any non-PAE frames received prior to
784 * authorization. For open/shared-key
785 * authentication the port is mark authorized
786 * after authentication completes. For 802.1x
787 * the port is not marked authorized by the
788 * authenticator until the handshake has completed.
789 */
790 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
791 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
792 eh->ether_shost, "data",
793 "unauthorized port: ether type 0x%x len %u",
794 eh->ether_type, m->m_pkthdr.len);
795 vap->iv_stats.is_rx_unauth++;
796 IEEE80211_NODE_STAT(ni, rx_unauth);
797 goto err;
798 }
799 } else {
800 /*
801 * When denying unencrypted frames, discard
802 * any non-PAE frames received without encryption.
803 */
804 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
805 (key == NULL && (m->m_flags & M_WEP) == 0) &&
806 eh->ether_type != htons(ETHERTYPE_PAE)) {
807 /*
808 * Drop unencrypted frames.
809 */
810 vap->iv_stats.is_rx_unencrypted++;
811 IEEE80211_NODE_STAT(ni, rx_unencrypted);
812 goto out;
813 }
814 }
815 /* XXX require HT? */
816 if (qos & IEEE80211_QOS_AMSDU) {
817 m = ieee80211_decap_amsdu(ni, m);
818 if (m == NULL)
819 return IEEE80211_FC0_TYPE_DATA;
820 } else {
821 #ifdef IEEE80211_SUPPORT_SUPERG
822 m = ieee80211_decap_fastframe(vap, ni, m);
823 if (m == NULL)
824 return IEEE80211_FC0_TYPE_DATA;
825 #endif
826 }
827 ieee80211_deliver_data(vap, ni, m);
828 return IEEE80211_FC0_TYPE_DATA;
829
830 case IEEE80211_FC0_TYPE_MGT:
831 vap->iv_stats.is_rx_mgmt++;
832 IEEE80211_NODE_STAT(ni, rx_mgmt);
833 if (dir != IEEE80211_FC1_DIR_NODS) {
834 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
835 wh, "data", "incorrect dir 0x%x", dir);
836 vap->iv_stats.is_rx_wrongdir++;
837 goto err;
838 }
839 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
840 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
841 ni->ni_macaddr, "mgt", "too short: len %u",
842 m->m_pkthdr.len);
843 vap->iv_stats.is_rx_tooshort++;
844 goto out;
845 }
846 #ifdef IEEE80211_DEBUG
847 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
848 ieee80211_msg_dumppkts(vap)) {
849 if_printf(ifp, "received %s from %s rssi %d\n",
850 ieee80211_mgt_subtype_name[subtype >>
851 IEEE80211_FC0_SUBTYPE_SHIFT],
852 ether_sprintf(wh->i_addr2), rssi);
853 }
854 #endif
855 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
856 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
857 /*
858 * Only shared key auth frames with a challenge
859 * should be encrypted, discard all others.
860 */
861 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
862 wh, ieee80211_mgt_subtype_name[subtype >>
863 IEEE80211_FC0_SUBTYPE_SHIFT],
864 "%s", "WEP set but not permitted");
865 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
866 goto out;
867 }
868 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
869 /*
870 * Discard encrypted frames when privacy is off.
871 */
872 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
873 wh, "mgt", "%s", "WEP set but PRIVACY off");
874 vap->iv_stats.is_rx_noprivacy++;
875 goto out;
876 }
877 hdrspace = ieee80211_hdrspace(ic, wh);
878 key = ieee80211_crypto_decap(ni, m, hdrspace);
879 if (key == NULL) {
880 /* NB: stats+msgs handled in crypto_decap */
881 goto out;
882 }
883 wh = mtod(m, struct ieee80211_frame *);
884 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
885 }
886 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
887 goto out;
888
889 case IEEE80211_FC0_TYPE_CTL:
890 vap->iv_stats.is_rx_ctl++;
891 IEEE80211_NODE_STAT(ni, rx_ctrl);
892 vap->iv_recv_ctl(ni, m, subtype);
893 goto out;
894
895 default:
896 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
897 wh, NULL, "bad frame type 0x%x", type);
898 /* should not come here */
899 break;
900 }
901 err:
902 ifp->if_ierrors++;
903 out:
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 }
911
912 static void
913 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
914 int rssi, int nf, uint16_t seq, uint16_t status)
915 {
916 struct ieee80211vap *vap = ni->ni_vap;
917
918 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
919 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
920 ni->ni_macaddr, "open auth",
921 "bad sta auth mode %u", ni->ni_authmode);
922 vap->iv_stats.is_rx_bad_auth++; /* XXX */
923 return;
924 }
925 if (vap->iv_state != IEEE80211_S_AUTH ||
926 seq != IEEE80211_AUTH_OPEN_RESPONSE) {
927 vap->iv_stats.is_rx_bad_auth++;
928 return;
929 }
930 if (status != 0) {
931 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
932 ni, "open auth failed (reason %d)", status);
933 vap->iv_stats.is_rx_auth_fail++;
934 vap->iv_stats.is_rx_authfail_code = status;
935 ieee80211_new_state(vap, IEEE80211_S_SCAN,
936 IEEE80211_SCAN_FAIL_STATUS);
937 } else
938 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
939 }
940
941 static void
942 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
943 uint8_t *frm, uint8_t *efrm, int rssi, int nf,
944 uint16_t seq, uint16_t status)
945 {
946 struct ieee80211vap *vap = ni->ni_vap;
947 uint8_t *challenge;
948 int estatus;
949
950 /*
951 * NB: this can happen as we allow pre-shared key
952 * authentication to be enabled w/o wep being turned
953 * on so that configuration of these can be done
954 * in any order. It may be better to enforce the
955 * ordering in which case this check would just be
956 * for sanity/consistency.
957 */
958 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
959 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
960 ni->ni_macaddr, "shared key auth",
961 "%s", " PRIVACY is disabled");
962 estatus = IEEE80211_STATUS_ALG;
963 goto bad;
964 }
965 /*
966 * Pre-shared key authentication is evil; accept
967 * it only if explicitly configured (it is supported
968 * mainly for compatibility with clients like OS X).
969 */
970 if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
971 ni->ni_authmode != IEEE80211_AUTH_SHARED) {
972 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
973 ni->ni_macaddr, "shared key auth",
974 "bad sta auth mode %u", ni->ni_authmode);
975 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
976 estatus = IEEE80211_STATUS_ALG;
977 goto bad;
978 }
979
980 challenge = NULL;
981 if (frm + 1 < efrm) {
982 if ((frm[1] + 2) > (efrm - frm)) {
983 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
984 ni->ni_macaddr, "shared key auth",
985 "ie %d/%d too long",
986 frm[0], (frm[1] + 2) - (efrm - frm));
987 vap->iv_stats.is_rx_bad_auth++;
988 estatus = IEEE80211_STATUS_CHALLENGE;
989 goto bad;
990 }
991 if (*frm == IEEE80211_ELEMID_CHALLENGE)
992 challenge = frm;
993 frm += frm[1] + 2;
994 }
995 switch (seq) {
996 case IEEE80211_AUTH_SHARED_CHALLENGE:
997 case IEEE80211_AUTH_SHARED_RESPONSE:
998 if (challenge == NULL) {
999 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1000 ni->ni_macaddr, "shared key auth",
1001 "%s", "no challenge");
1002 vap->iv_stats.is_rx_bad_auth++;
1003 estatus = IEEE80211_STATUS_CHALLENGE;
1004 goto bad;
1005 }
1006 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1007 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1008 ni->ni_macaddr, "shared key auth",
1009 "bad challenge len %d", challenge[1]);
1010 vap->iv_stats.is_rx_bad_auth++;
1011 estatus = IEEE80211_STATUS_CHALLENGE;
1012 goto bad;
1013 }
1014 default:
1015 break;
1016 }
1017 if (vap->iv_state != IEEE80211_S_AUTH)
1018 return;
1019 switch (seq) {
1020 case IEEE80211_AUTH_SHARED_PASS:
1021 if (ni->ni_challenge != NULL) {
1022 free(ni->ni_challenge, M_80211_NODE);
1023 ni->ni_challenge = NULL;
1024 }
1025 if (status != 0) {
1026 IEEE80211_NOTE_FRAME(vap,
1027 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1028 "shared key auth failed (reason %d)", status);
1029 vap->iv_stats.is_rx_auth_fail++;
1030 vap->iv_stats.is_rx_authfail_code = status;
1031 return;
1032 }
1033 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1034 break;
1035 case IEEE80211_AUTH_SHARED_CHALLENGE:
1036 if (!ieee80211_alloc_challenge(ni))
1037 return;
1038 /* XXX could optimize by passing recvd challenge */
1039 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1040 IEEE80211_SEND_MGMT(ni,
1041 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1042 break;
1043 default:
1044 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1045 wh, "shared key auth", "bad seq %d", seq);
1046 vap->iv_stats.is_rx_bad_auth++;
1047 return;
1048 }
1049 return;
1050 bad:
1051 /*
1052 * Kick the state machine. This short-circuits
1053 * using the mgt frame timeout to trigger the
1054 * state transition.
1055 */
1056 if (vap->iv_state == IEEE80211_S_AUTH)
1057 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1058 IEEE80211_SCAN_FAIL_STATUS);
1059 }
1060
1061 static int
1062 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1063 const struct ieee80211_frame *wh)
1064 {
1065 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
1066 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1067 u_int len = frm[1], qosinfo;
1068 int i;
1069
1070 if (len < sizeof(struct ieee80211_wme_param)-2) {
1071 IEEE80211_DISCARD_IE(vap,
1072 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1073 wh, "WME", "too short, len %u", len);
1074 return -1;
1075 }
1076 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1077 qosinfo &= WME_QOSINFO_COUNT;
1078 /* XXX do proper check for wraparound */
1079 if (qosinfo == wme->wme_wmeChanParams.cap_info)
1080 return 0;
1081 frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1082 for (i = 0; i < WME_NUM_AC; i++) {
1083 struct wmeParams *wmep =
1084 &wme->wme_wmeChanParams.cap_wmeParams[i];
1085 /* NB: ACI not used */
1086 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
1087 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
1088 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
1089 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
1090 wmep->wmep_txopLimit = LE_READ_2(frm+2);
1091 frm += 4;
1092 }
1093 wme->wme_wmeChanParams.cap_info = qosinfo;
1094 return 1;
1095 #undef MS
1096 }
1097
1098 /*
1099 * Process 11h Channel Switch Announcement (CSA) ie. If this
1100 * is the first CSA then initiate the switch. Otherwise we
1101 * track state and trigger completion and/or cancel of the switch.
1102 * XXX should be public for IBSS use
1103 */
1104 static void
1105 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1106 const struct ieee80211_frame *wh)
1107 {
1108 struct ieee80211com *ic = vap->iv_ic;
1109 const struct ieee80211_csa_ie *csa =
1110 (const struct ieee80211_csa_ie *) frm;
1111
1112 KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1113 ("state %s", ieee80211_state_name[vap->iv_state]));
1114
1115 if (csa->csa_mode > 1) {
1116 IEEE80211_DISCARD_IE(vap,
1117 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1118 wh, "CSA", "invalid mode %u", csa->csa_mode);
1119 return;
1120 }
1121 IEEE80211_LOCK(ic);
1122 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1123 /*
1124 * Convert the channel number to a channel reference. We
1125 * try first to preserve turbo attribute of the current
1126 * channel then fallback. Note this will not work if the
1127 * CSA specifies a channel that requires a band switch (e.g.
1128 * 11a => 11g). This is intentional as 11h is defined only
1129 * for 5GHz/11a and because the switch does not involve a
1130 * reassociation, protocol state (capabilities, negotated
1131 * rates, etc) may/will be wrong.
1132 */
1133 struct ieee80211_channel *c =
1134 ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1135 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1136 if (c == NULL) {
1137 c = ieee80211_find_channel_byieee(ic,
1138 csa->csa_newchan,
1139 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1140 if (c == NULL) {
1141 IEEE80211_DISCARD_IE(vap,
1142 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1143 wh, "CSA", "invalid channel %u",
1144 csa->csa_newchan);
1145 goto done;
1146 }
1147 }
1148 #if IEEE80211_CSA_COUNT_MIN > 0
1149 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1150 /*
1151 * Require at least IEEE80211_CSA_COUNT_MIN count to
1152 * reduce the risk of being redirected by a fabricated
1153 * CSA. If a valid CSA is dropped we'll still get a
1154 * beacon miss when the AP leaves the channel so we'll
1155 * eventually follow to the new channel.
1156 *
1157 * NOTE: this violates the 11h spec that states that
1158 * count may be any value and if 0 then a switch
1159 * should happen asap.
1160 */
1161 IEEE80211_DISCARD_IE(vap,
1162 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1163 wh, "CSA", "count %u too small, must be >= %u",
1164 csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1165 goto done;
1166 }
1167 #endif
1168 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1169 } else {
1170 /*
1171 * Validate this ie against the initial CSA. We require
1172 * mode and channel not change and the count must be
1173 * monotonically decreasing. This may be pointless and
1174 * canceling the switch as a result may be too paranoid but
1175 * in the worst case if we drop out of CSA because of this
1176 * and the AP does move then we'll just end up taking a
1177 * beacon miss and scan to find the AP.
1178 *
1179 * XXX may want <= on count as we also process ProbeResp
1180 * frames and those may come in w/ the same count as the
1181 * previous beacon; but doing so leaves us open to a stuck
1182 * count until we add a dead-man timer
1183 */
1184 if (!(csa->csa_count < ic->ic_csa_count &&
1185 csa->csa_mode == ic->ic_csa_mode &&
1186 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1187 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1188 "CSA ie mismatch, initial ie <%d,%d,%d>, "
1189 "this ie <%d,%d,%d>", ic->ic_csa_mode,
1190 ic->ic_csa_newchan, ic->ic_csa_count,
1191 csa->csa_mode, csa->csa_newchan, csa->csa_count);
1192 ieee80211_csa_cancelswitch(ic);
1193 } else {
1194 if (csa->csa_count <= 1)
1195 ieee80211_csa_completeswitch(ic);
1196 else
1197 ic->ic_csa_count = csa->csa_count;
1198 }
1199 }
1200 done:
1201 IEEE80211_UNLOCK(ic);
1202 }
1203
1204 /*
1205 * Return non-zero if a background scan may be continued:
1206 * o bg scan is active
1207 * o no channel switch is pending
1208 * o there has not been any traffic recently
1209 *
1210 * Note we do not check if there is an administrative enable;
1211 * this is only done to start the scan. We assume that any
1212 * change in state will be accompanied by a request to cancel
1213 * active scans which will otherwise cause this test to fail.
1214 */
1215 static __inline int
1216 contbgscan(struct ieee80211vap *vap)
1217 {
1218 struct ieee80211com *ic = vap->iv_ic;
1219
1220 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1221 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1222 vap->iv_state == IEEE80211_S_RUN && /* XXX? */
1223 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1224 }
1225
1226 /*
1227 * Return non-zero if a backgrond scan may be started:
1228 * o bg scanning is administratively enabled
1229 * o no channel switch is pending
1230 * o we are not boosted on a dynamic turbo channel
1231 * o there has not been a scan recently
1232 * o there has not been any traffic recently
1233 */
1234 static __inline int
1235 startbgscan(struct ieee80211vap *vap)
1236 {
1237 struct ieee80211com *ic = vap->iv_ic;
1238
1239 return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1240 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1241 #ifdef IEEE80211_SUPPORT_SUPERG
1242 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1243 #endif
1244 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1245 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1246 }
1247
1248 static void
1249 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1250 int subtype, int rssi, int nf)
1251 {
1252 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1253 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1254 struct ieee80211vap *vap = ni->ni_vap;
1255 struct ieee80211com *ic = ni->ni_ic;
1256 struct ieee80211_frame *wh;
1257 uint8_t *frm, *efrm;
1258 uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1259 uint8_t rate;
1260
1261 wh = mtod(m0, struct ieee80211_frame *);
1262 frm = (uint8_t *)&wh[1];
1263 efrm = mtod(m0, uint8_t *) + m0->m_len;
1264 switch (subtype) {
1265 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1266 case IEEE80211_FC0_SUBTYPE_BEACON: {
1267 struct ieee80211_scanparams scan;
1268 /*
1269 * We process beacon/probe response frames:
1270 * o when scanning, or
1271 * o station mode when associated (to collect state
1272 * updates such as 802.11g slot time)
1273 * Frames otherwise received are discarded.
1274 */
1275 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1276 vap->iv_stats.is_rx_mgtdiscard++;
1277 return;
1278 }
1279 /* XXX probe response in sta mode when !scanning? */
1280 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
1281 return;
1282 /*
1283 * Count frame now that we know it's to be processed.
1284 */
1285 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1286 vap->iv_stats.is_rx_beacon++; /* XXX remove */
1287 IEEE80211_NODE_STAT(ni, rx_beacons);
1288 } else
1289 IEEE80211_NODE_STAT(ni, rx_proberesp);
1290 /*
1291 * When operating in station mode, check for state updates.
1292 * Be careful to ignore beacons received while doing a
1293 * background scan. We consider only 11g/WMM stuff right now.
1294 */
1295 if (ni->ni_associd != 0 &&
1296 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1297 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1298 /* record tsf of last beacon */
1299 memcpy(ni->ni_tstamp.data, scan.tstamp,
1300 sizeof(ni->ni_tstamp));
1301 /* count beacon frame for s/w bmiss handling */
1302 vap->iv_swbmiss_count++;
1303 vap->iv_bmiss_count = 0;
1304 if (ni->ni_erp != scan.erp) {
1305 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1306 wh->i_addr2,
1307 "erp change: was 0x%x, now 0x%x",
1308 ni->ni_erp, scan.erp);
1309 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1310 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1311 ic->ic_flags |= IEEE80211_F_USEPROT;
1312 else
1313 ic->ic_flags &= ~IEEE80211_F_USEPROT;
1314 ni->ni_erp = scan.erp;
1315 /* XXX statistic */
1316 /* XXX driver notification */
1317 }
1318 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1319 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1320 wh->i_addr2,
1321 "capabilities change: was 0x%x, now 0x%x",
1322 ni->ni_capinfo, scan.capinfo);
1323 /*
1324 * NB: we assume short preamble doesn't
1325 * change dynamically
1326 */
1327 ieee80211_set_shortslottime(ic,
1328 IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1329 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1330 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1331 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1332 /* XXX statistic */
1333 }
1334 if (scan.wme != NULL &&
1335 (ni->ni_flags & IEEE80211_NODE_QOS) &&
1336 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
1337 ieee80211_wme_updateparams(vap);
1338 #ifdef IEEE80211_SUPPORT_SUPERG
1339 if (scan.ath != NULL)
1340 ieee80211_parse_athparams(ni, scan.ath, wh);
1341 #endif
1342 if (scan.htcap != NULL && scan.htinfo != NULL &&
1343 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1344 ieee80211_ht_updateparams(ni,
1345 scan.htcap, scan.htinfo);
1346 /* XXX state changes? */
1347 }
1348 if (scan.tim != NULL) {
1349 struct ieee80211_tim_ie *tim =
1350 (struct ieee80211_tim_ie *) scan.tim;
1351 #if 0
1352 int aid = IEEE80211_AID(ni->ni_associd);
1353 int ix = aid / NBBY;
1354 int min = tim->tim_bitctl &~ 1;
1355 int max = tim->tim_len + min - 4;
1356 if ((tim->tim_bitctl&1) ||
1357 (min <= ix && ix <= max &&
1358 isset(tim->tim_bitmap - min, aid))) {
1359 /*
1360 * XXX Do not let bg scan kick off
1361 * we are expecting data.
1362 */
1363 ic->ic_lastdata = ticks;
1364 ieee80211_sta_pwrsave(vap, 0);
1365 }
1366 #endif
1367 ni->ni_dtim_count = tim->tim_count;
1368 ni->ni_dtim_period = tim->tim_period;
1369 }
1370 if (scan.csa != NULL &&
1371 (vap->iv_flags & IEEE80211_F_DOTH))
1372 ieee80211_parse_csaparams(vap, scan.csa, wh);
1373 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1374 /*
1375 * No CSA ie or 11h disabled, but a channel
1376 * switch is pending; drop out so we aren't
1377 * stuck in CSA state. If the AP really is
1378 * moving we'll get a beacon miss and scan.
1379 */
1380 IEEE80211_LOCK(ic);
1381 ieee80211_csa_cancelswitch(ic);
1382 IEEE80211_UNLOCK(ic);
1383 }
1384 /*
1385 * If scanning, pass the info to the scan module.
1386 * Otherwise, check if it's the right time to do
1387 * a background scan. Background scanning must
1388 * be enabled and we must not be operating in the
1389 * turbo phase of dynamic turbo mode. Then,
1390 * it's been a while since the last background
1391 * scan and if no data frames have come through
1392 * recently, kick off a scan. Note that this
1393 * is the mechanism by which a background scan
1394 * is started _and_ continued each time we
1395 * return on-channel to receive a beacon from
1396 * our ap.
1397 */
1398 if (ic->ic_flags & IEEE80211_F_SCAN) {
1399 ieee80211_add_scan(vap, &scan, wh,
1400 subtype, rssi, nf);
1401 } else if (contbgscan(vap)) {
1402 ieee80211_bg_scan(vap, 0);
1403 } else if (startbgscan(vap)) {
1404 vap->iv_stats.is_scan_bg++;
1405 #if 0
1406 /* wakeup if we are sleeing */
1407 ieee80211_set_pwrsave(vap, 0);
1408 #endif
1409 ieee80211_bg_scan(vap, 0);
1410 }
1411 return;
1412 }
1413 /*
1414 * If scanning, just pass information to the scan module.
1415 */
1416 if (ic->ic_flags & IEEE80211_F_SCAN) {
1417 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1418 /*
1419 * Actively scanning a channel marked passive;
1420 * send a probe request now that we know there
1421 * is 802.11 traffic present.
1422 *
1423 * XXX check if the beacon we recv'd gives
1424 * us what we need and suppress the probe req
1425 */
1426 ieee80211_probe_curchan(vap, 1);
1427 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1428 }
1429 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1430 return;
1431 }
1432 break;
1433 }
1434
1435 case IEEE80211_FC0_SUBTYPE_AUTH: {
1436 uint16_t algo, seq, status;
1437 /*
1438 * auth frame format
1439 * [2] algorithm
1440 * [2] sequence
1441 * [2] status
1442 * [tlv*] challenge
1443 */
1444 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1445 algo = le16toh(*(uint16_t *)frm);
1446 seq = le16toh(*(uint16_t *)(frm + 2));
1447 status = le16toh(*(uint16_t *)(frm + 4));
1448 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1449 "recv auth frame with algorithm %d seq %d", algo, seq);
1450
1451 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1452 IEEE80211_DISCARD(vap,
1453 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1454 wh, "auth", "%s", "TKIP countermeasures enabled");
1455 vap->iv_stats.is_rx_auth_countermeasures++;
1456 if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1457 ieee80211_send_error(ni, wh->i_addr2,
1458 IEEE80211_FC0_SUBTYPE_AUTH,
1459 IEEE80211_REASON_MIC_FAILURE);
1460 }
1461 return;
1462 }
1463 if (algo == IEEE80211_AUTH_ALG_SHARED)
1464 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1465 seq, status);
1466 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1467 sta_auth_open(ni, wh, rssi, nf, seq, status);
1468 else {
1469 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1470 wh, "auth", "unsupported alg %d", algo);
1471 vap->iv_stats.is_rx_auth_unsupported++;
1472 return;
1473 }
1474 break;
1475 }
1476
1477 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1478 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1479 uint16_t capinfo, associd;
1480 uint16_t status;
1481
1482 if (vap->iv_state != IEEE80211_S_ASSOC) {
1483 vap->iv_stats.is_rx_mgtdiscard++;
1484 return;
1485 }
1486
1487 /*
1488 * asresp frame format
1489 * [2] capability information
1490 * [2] status
1491 * [2] association ID
1492 * [tlv] supported rates
1493 * [tlv] extended supported rates
1494 * [tlv] WME
1495 * [tlv] HT capabilities
1496 * [tlv] HT info
1497 */
1498 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1499 ni = vap->iv_bss;
1500 capinfo = le16toh(*(uint16_t *)frm);
1501 frm += 2;
1502 status = le16toh(*(uint16_t *)frm);
1503 frm += 2;
1504 if (status != 0) {
1505 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1506 wh->i_addr2, "%sassoc failed (reason %d)",
1507 ISREASSOC(subtype) ? "re" : "", status);
1508 vap->iv_stats.is_rx_auth_fail++; /* XXX */
1509 return;
1510 }
1511 associd = le16toh(*(uint16_t *)frm);
1512 frm += 2;
1513
1514 rates = xrates = wme = htcap = htinfo = NULL;
1515 while (efrm - frm > 1) {
1516 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1517 switch (*frm) {
1518 case IEEE80211_ELEMID_RATES:
1519 rates = frm;
1520 break;
1521 case IEEE80211_ELEMID_XRATES:
1522 xrates = frm;
1523 break;
1524 case IEEE80211_ELEMID_HTCAP:
1525 htcap = frm;
1526 break;
1527 case IEEE80211_ELEMID_HTINFO:
1528 htinfo = frm;
1529 break;
1530 case IEEE80211_ELEMID_VENDOR:
1531 if (iswmeoui(frm))
1532 wme = frm;
1533 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1534 /*
1535 * Accept pre-draft HT ie's if the
1536 * standard ones have not been seen.
1537 */
1538 if (ishtcapoui(frm)) {
1539 if (htcap == NULL)
1540 htcap = frm;
1541 } else if (ishtinfooui(frm)) {
1542 if (htinfo == NULL)
1543 htinfo = frm;
1544 }
1545 }
1546 /* XXX Atheros OUI support */
1547 break;
1548 }
1549 frm += frm[1] + 2;
1550 }
1551
1552 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1553 if (xrates != NULL)
1554 IEEE80211_VERIFY_ELEMENT(xrates,
1555 IEEE80211_RATE_MAXSIZE - rates[1], return);
1556 rate = ieee80211_setup_rates(ni, rates, xrates,
1557 IEEE80211_F_JOIN |
1558 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1559 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1560 if (rate & IEEE80211_RATE_BASIC) {
1561 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1562 wh->i_addr2,
1563 "%sassoc failed (rate set mismatch)",
1564 ISREASSOC(subtype) ? "re" : "");
1565 vap->iv_stats.is_rx_assoc_norate++;
1566 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1567 IEEE80211_SCAN_FAIL_STATUS);
1568 return;
1569 }
1570
1571 ni->ni_capinfo = capinfo;
1572 ni->ni_associd = associd;
1573 if (ni->ni_jointime == 0)
1574 ni->ni_jointime = time_uptime;
1575 if (wme != NULL &&
1576 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
1577 ni->ni_flags |= IEEE80211_NODE_QOS;
1578 ieee80211_wme_updateparams(vap);
1579 } else
1580 ni->ni_flags &= ~IEEE80211_NODE_QOS;
1581 /*
1582 * Setup HT state according to the negotiation.
1583 *
1584 * NB: shouldn't need to check if HT use is enabled but some
1585 * ap's send back HT ie's even when we don't indicate we
1586 * are HT capable in our AssocReq.
1587 */
1588 if (htcap != NULL && htinfo != NULL &&
1589 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1590 ieee80211_ht_node_init(ni);
1591 ieee80211_ht_updateparams(ni, htcap, htinfo);
1592 ieee80211_setup_htrates(ni, htcap,
1593 IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1594 ieee80211_setup_basic_htrates(ni, htinfo);
1595 ieee80211_node_setuptxparms(ni);
1596 ieee80211_ratectl_node_init(ni);
1597 } else {
1598 #ifdef IEEE80211_SUPPORT_SUPERG
1599 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH))
1600 ieee80211_ff_node_init(ni);
1601 #endif
1602 }
1603 /*
1604 * Configure state now that we are associated.
1605 *
1606 * XXX may need different/additional driver callbacks?
1607 */
1608 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1609 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1610 ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
1611 ic->ic_flags &= ~IEEE80211_F_USEBARKER;
1612 } else {
1613 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
1614 ic->ic_flags |= IEEE80211_F_USEBARKER;
1615 }
1616 ieee80211_set_shortslottime(ic,
1617 IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1618 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1619 /*
1620 * Honor ERP protection.
1621 *
1622 * NB: ni_erp should zero for non-11g operation.
1623 */
1624 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1625 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1626 ic->ic_flags |= IEEE80211_F_USEPROT;
1627 else
1628 ic->ic_flags &= ~IEEE80211_F_USEPROT;
1629 IEEE80211_NOTE_MAC(vap,
1630 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1631 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
1632 ISREASSOC(subtype) ? "re" : "",
1633 IEEE80211_NODE_AID(ni),
1634 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1635 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1636 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1637 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1638 ni->ni_flags & IEEE80211_NODE_HT ?
1639 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1640 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1641 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1642 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1643 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1644 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1645 ", fast-frames" : "",
1646 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1647 ", turbo" : ""
1648 );
1649 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1650 break;
1651 }
1652
1653 case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1654 uint16_t reason;
1655
1656 if (vap->iv_state == IEEE80211_S_SCAN) {
1657 vap->iv_stats.is_rx_mgtdiscard++;
1658 return;
1659 }
1660 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1661 /* NB: can happen when in promiscuous mode */
1662 vap->iv_stats.is_rx_mgtdiscard++;
1663 break;
1664 }
1665
1666 /*
1667 * deauth frame format
1668 * [2] reason
1669 */
1670 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1671 reason = le16toh(*(uint16_t *)frm);
1672
1673 vap->iv_stats.is_rx_deauth++;
1674 vap->iv_stats.is_rx_deauth_code = reason;
1675 IEEE80211_NODE_STAT(ni, rx_deauth);
1676
1677 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1678 "recv deauthenticate (reason %d)", reason);
1679 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1680 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1681 break;
1682 }
1683
1684 case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1685 uint16_t reason;
1686
1687 if (vap->iv_state != IEEE80211_S_RUN &&
1688 vap->iv_state != IEEE80211_S_ASSOC &&
1689 vap->iv_state != IEEE80211_S_AUTH) {
1690 vap->iv_stats.is_rx_mgtdiscard++;
1691 return;
1692 }
1693 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1694 /* NB: can happen when in promiscuous mode */
1695 vap->iv_stats.is_rx_mgtdiscard++;
1696 break;
1697 }
1698
1699 /*
1700 * disassoc frame format
1701 * [2] reason
1702 */
1703 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1704 reason = le16toh(*(uint16_t *)frm);
1705
1706 vap->iv_stats.is_rx_disassoc++;
1707 vap->iv_stats.is_rx_disassoc_code = reason;
1708 IEEE80211_NODE_STAT(ni, rx_disassoc);
1709
1710 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1711 "recv disassociate (reason %d)", reason);
1712 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1713 break;
1714 }
1715
1716 case IEEE80211_FC0_SUBTYPE_ACTION:
1717 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
1718 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
1719 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1720 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1721 wh, NULL, "%s", "not for us");
1722 vap->iv_stats.is_rx_mgtdiscard++;
1723 } else if (vap->iv_state != IEEE80211_S_RUN) {
1724 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1725 wh, NULL, "wrong state %s",
1726 ieee80211_state_name[vap->iv_state]);
1727 vap->iv_stats.is_rx_mgtdiscard++;
1728 } else {
1729 if (ieee80211_parse_action(ni, m0) == 0)
1730 (void)ic->ic_recv_action(ni, wh, frm, efrm);
1731 }
1732 break;
1733
1734 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1735 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1736 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1737 case IEEE80211_FC0_SUBTYPE_ATIM:
1738 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1739 wh, NULL, "%s", "not handled");
1740 vap->iv_stats.is_rx_mgtdiscard++;
1741 break;
1742
1743 default:
1744 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1745 wh, "mgt", "subtype 0x%x not handled", subtype);
1746 vap->iv_stats.is_rx_badsubtype++;
1747 break;
1748 }
1749 #undef ISREASSOC
1750 #undef ISPROBE
1751 }
1752
1753 static void
1754 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1755 {
1756 switch (subtype) {
1757 case IEEE80211_FC0_SUBTYPE_BAR:
1758 ieee80211_recv_bar(ni, m);
1759 break;
1760 }
1761 }
Cache object: 56f7b5aa7ad3b25969a68beac6af2525
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