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/if_dl.h>
54 #include <net/if_var.h>
55 #include <net/ethernet.h>
56
57 #include <net/bpf.h>
58
59 #include <netproto/802_11/ieee80211_var.h>
60 #include <netproto/802_11/ieee80211_sta.h>
61 #include <netproto/802_11/ieee80211_input.h>
62 #ifdef IEEE80211_SUPPORT_SUPERG
63 #include <netproto/802_11/ieee80211_superg.h>
64 #endif
65 #include <netproto/802_11/ieee80211_ratectl.h>
66 #include <netproto/802_11/ieee80211_sta.h>
67
68 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
69
70 static void sta_vattach(struct ieee80211vap *);
71 static void sta_beacon_miss(struct ieee80211vap *);
72 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
73 static int sta_input(struct ieee80211_node *, struct mbuf *,
74 const struct ieee80211_rx_stats *, int, int);
75 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
76 int subtype, const struct ieee80211_rx_stats *, int rssi, int nf);
77 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
78
79 void
ieee80211_sta_attach(struct ieee80211com * ic)80 ieee80211_sta_attach(struct ieee80211com *ic)
81 {
82 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
83 }
84
85 void
ieee80211_sta_detach(struct ieee80211com * ic)86 ieee80211_sta_detach(struct ieee80211com *ic)
87 {
88 }
89
90 static void
sta_vdetach(struct ieee80211vap * vap)91 sta_vdetach(struct ieee80211vap *vap)
92 {
93 }
94
95 static void
sta_vattach(struct ieee80211vap * vap)96 sta_vattach(struct ieee80211vap *vap)
97 {
98 vap->iv_newstate = sta_newstate;
99 vap->iv_input = sta_input;
100 vap->iv_recv_mgmt = sta_recv_mgmt;
101 vap->iv_recv_ctl = sta_recv_ctl;
102 vap->iv_opdetach = sta_vdetach;
103 vap->iv_bmiss = sta_beacon_miss;
104 }
105
106 /*
107 * Handle a beacon miss event. The common code filters out
108 * spurious events that can happen when scanning and/or before
109 * reaching RUN state.
110 */
111 static void
sta_beacon_miss(struct ieee80211vap * vap)112 sta_beacon_miss(struct ieee80211vap *vap)
113 {
114 struct ieee80211com *ic = vap->iv_ic;
115
116 IEEE80211_LOCK_ASSERT(ic);
117
118 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
119 KASSERT(vap->iv_state >= IEEE80211_S_RUN,
120 ("wrong state %s", ieee80211_state_name[vap->iv_state]));
121
122 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
123 "beacon miss, mode %s state %s\n",
124 ieee80211_opmode_name[vap->iv_opmode],
125 ieee80211_state_name[vap->iv_state]);
126
127 if (vap->iv_state == IEEE80211_S_CSA) {
128 /*
129 * A Channel Switch is pending; assume we missed the
130 * beacon that would've completed the process and just
131 * force the switch. If we made a mistake we'll not
132 * find the AP on the new channel and fall back to a
133 * normal scan.
134 */
135 ieee80211_csa_completeswitch(ic);
136 return;
137 }
138 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
139 /*
140 * Send a directed probe req before falling back to a
141 * scan; if we receive a response ic_bmiss_count will
142 * be reset. Some cards mistakenly report beacon miss
143 * so this avoids the expensive scan if the ap is
144 * still there.
145 */
146 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
147 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
148 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
149 return;
150 }
151
152 callout_stop(&vap->iv_swbmiss);
153 vap->iv_bmiss_count = 0;
154 vap->iv_stats.is_beacon_miss++;
155 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
156 #ifdef IEEE80211_SUPPORT_SUPERG
157 struct ieee80211com *ic = vap->iv_ic;
158
159 /*
160 * If we receive a beacon miss interrupt when using
161 * dynamic turbo, attempt to switch modes before
162 * reassociating.
163 */
164 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
165 ieee80211_dturbo_switch(vap,
166 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
167 #endif
168 /*
169 * Try to reassociate before scanning for a new ap.
170 */
171 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
172 } else {
173 /*
174 * Somebody else is controlling state changes (e.g.
175 * a user-mode app) don't do anything that would
176 * confuse them; just drop into scan mode so they'll
177 * notified of the state change and given control.
178 */
179 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
180 }
181 }
182
183 /*
184 * Handle deauth with reason. We retry only for
185 * the cases where we might succeed. Otherwise
186 * we downgrade the ap and scan.
187 */
188 static void
sta_authretry(struct ieee80211vap * vap,struct ieee80211_node * ni,int reason)189 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
190 {
191 switch (reason) {
192 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */
193 case IEEE80211_STATUS_TIMEOUT:
194 case IEEE80211_REASON_ASSOC_EXPIRE:
195 case IEEE80211_REASON_NOT_AUTHED:
196 case IEEE80211_REASON_NOT_ASSOCED:
197 case IEEE80211_REASON_ASSOC_LEAVE:
198 case IEEE80211_REASON_ASSOC_NOT_AUTHED:
199 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
200 break;
201 default:
202 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
203 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
204 ieee80211_check_scan_current(vap);
205 break;
206 }
207 }
208
209 static void
sta_swbmiss_start(struct ieee80211vap * vap)210 sta_swbmiss_start(struct ieee80211vap *vap)
211 {
212
213 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) {
214 /*
215 * Start s/w beacon miss timer for devices w/o
216 * hardware support. We fudge a bit here since
217 * we're doing this in software.
218 */
219 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
220 2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval);
221 vap->iv_swbmiss_count = 0;
222 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
223 ieee80211_swbmiss, vap);
224 }
225 }
226
227 /*
228 * IEEE80211_M_STA vap state machine handler.
229 * This routine handles the main states in the 802.11 protocol.
230 */
231 static int
sta_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)232 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
233 {
234 struct ieee80211com *ic = vap->iv_ic;
235 struct ieee80211_node *ni;
236 enum ieee80211_state ostate;
237
238 IEEE80211_LOCK_ASSERT(ic);
239
240 ostate = vap->iv_state;
241 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
242 __func__, ieee80211_state_name[ostate],
243 ieee80211_state_name[nstate], arg);
244 vap->iv_state = nstate; /* state transition */
245 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */
246 if (ostate != IEEE80211_S_SCAN)
247 ieee80211_cancel_scan(vap); /* background scan */
248 ni = vap->iv_bss; /* NB: no reference held */
249 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
250 callout_stop(&vap->iv_swbmiss);
251 switch (nstate) {
252 case IEEE80211_S_INIT:
253 switch (ostate) {
254 case IEEE80211_S_SLEEP:
255 /* XXX wakeup */
256 /* XXX driver hook to wakeup the hardware? */
257 case IEEE80211_S_RUN:
258 IEEE80211_SEND_MGMT(ni,
259 IEEE80211_FC0_SUBTYPE_DISASSOC,
260 IEEE80211_REASON_ASSOC_LEAVE);
261 ieee80211_sta_leave(ni);
262 break;
263 case IEEE80211_S_ASSOC:
264 IEEE80211_SEND_MGMT(ni,
265 IEEE80211_FC0_SUBTYPE_DEAUTH,
266 IEEE80211_REASON_AUTH_LEAVE);
267 break;
268 case IEEE80211_S_SCAN:
269 ieee80211_cancel_scan(vap);
270 break;
271 default:
272 break;
273 }
274 if (ostate != IEEE80211_S_INIT) {
275 /* NB: optimize INIT -> INIT case */
276 ieee80211_reset_bss(vap);
277 }
278 if (vap->iv_auth->ia_detach != NULL)
279 vap->iv_auth->ia_detach(vap);
280 break;
281 case IEEE80211_S_SCAN:
282 switch (ostate) {
283 case IEEE80211_S_INIT:
284 /*
285 * Initiate a scan. We can come here as a result
286 * of an IEEE80211_IOC_SCAN_REQ too in which case
287 * the vap will be marked with IEEE80211_FEXT_SCANREQ
288 * and the scan request parameters will be present
289 * in iv_scanreq. Otherwise we do the default.
290 */
291 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
292 ieee80211_check_scan(vap,
293 vap->iv_scanreq_flags,
294 vap->iv_scanreq_duration,
295 vap->iv_scanreq_mindwell,
296 vap->iv_scanreq_maxdwell,
297 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
298 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
299 } else
300 ieee80211_check_scan_current(vap);
301 break;
302 case IEEE80211_S_SCAN:
303 case IEEE80211_S_AUTH:
304 case IEEE80211_S_ASSOC:
305 /*
306 * These can happen either because of a timeout
307 * on an assoc/auth response or because of a
308 * change in state that requires a reset. For
309 * the former we're called with a non-zero arg
310 * that is the cause for the failure; pass this
311 * to the scan code so it can update state.
312 * Otherwise trigger a new scan unless we're in
313 * manual roaming mode in which case an application
314 * must issue an explicit scan request.
315 */
316 if (arg != 0)
317 ieee80211_scan_assoc_fail(vap,
318 vap->iv_bss->ni_macaddr, arg);
319 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
320 ieee80211_check_scan_current(vap);
321 break;
322 case IEEE80211_S_SLEEP: /* beacon miss */
323 /*
324 * XXX if in sleep we need to wakeup the hardware.
325 */
326 /* FALLTHROUGH */
327 case IEEE80211_S_RUN: /* beacon miss */
328 /*
329 * Beacon miss. Notify user space and if not
330 * under control of a user application (roaming
331 * manual) kick off a scan to re-connect.
332 */
333
334 ieee80211_sta_leave(ni);
335 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
336 ieee80211_check_scan_current(vap);
337 break;
338 default:
339 goto invalid;
340 }
341 break;
342 case IEEE80211_S_AUTH:
343 switch (ostate) {
344 case IEEE80211_S_INIT:
345 case IEEE80211_S_SCAN:
346 IEEE80211_SEND_MGMT(ni,
347 IEEE80211_FC0_SUBTYPE_AUTH, 1);
348 break;
349 case IEEE80211_S_AUTH:
350 case IEEE80211_S_ASSOC:
351 switch (arg & 0xff) {
352 case IEEE80211_FC0_SUBTYPE_AUTH:
353 /* ??? */
354 IEEE80211_SEND_MGMT(ni,
355 IEEE80211_FC0_SUBTYPE_AUTH, 2);
356 break;
357 case IEEE80211_FC0_SUBTYPE_DEAUTH:
358 sta_authretry(vap, ni, arg>>8);
359 break;
360 }
361 break;
362 case IEEE80211_S_SLEEP:
363 case IEEE80211_S_RUN:
364 switch (arg & 0xff) {
365 case IEEE80211_FC0_SUBTYPE_AUTH:
366 IEEE80211_SEND_MGMT(ni,
367 IEEE80211_FC0_SUBTYPE_AUTH, 2);
368 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */
369 break;
370 case IEEE80211_FC0_SUBTYPE_DEAUTH:
371 ieee80211_sta_leave(ni);
372 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
373 /* try to reauth */
374 IEEE80211_SEND_MGMT(ni,
375 IEEE80211_FC0_SUBTYPE_AUTH, 1);
376 }
377 break;
378 }
379 break;
380 default:
381 goto invalid;
382 }
383 break;
384 case IEEE80211_S_ASSOC:
385 switch (ostate) {
386 case IEEE80211_S_AUTH:
387 case IEEE80211_S_ASSOC:
388 IEEE80211_SEND_MGMT(ni,
389 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
390 break;
391 case IEEE80211_S_SLEEP: /* cannot happen */
392 case IEEE80211_S_RUN:
393 ieee80211_sta_leave(ni);
394 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
395 IEEE80211_SEND_MGMT(ni, arg ?
396 IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
397 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
398 }
399 break;
400 default:
401 goto invalid;
402 }
403 break;
404 case IEEE80211_S_RUN:
405 if (vap->iv_flags & IEEE80211_F_WPA) {
406 /* XXX validate prerequisites */
407 }
408 switch (ostate) {
409 case IEEE80211_S_RUN:
410 case IEEE80211_S_CSA:
411 break;
412 case IEEE80211_S_AUTH: /* when join is done in fw */
413 case IEEE80211_S_ASSOC:
414 #ifdef IEEE80211_DEBUG
415 if (ieee80211_msg_debug(vap)) {
416 ieee80211_note(vap, "%s with %s ssid ",
417 (vap->iv_opmode == IEEE80211_M_STA ?
418 "associated" : "synchronized"),
419 ether_sprintf(ni->ni_bssid));
420 ieee80211_print_essid(vap->iv_bss->ni_essid,
421 ni->ni_esslen);
422 /* XXX MCS/HT */
423 kprintf(" channel %d start %uMb\n",
424 ieee80211_chan2ieee(ic, ic->ic_curchan),
425 IEEE80211_RATE2MBS(ni->ni_txrate));
426 }
427 #endif
428 ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
429 ieee80211_notify_node_join(ni,
430 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
431 break;
432 case IEEE80211_S_SLEEP:
433 /* Wake up from sleep */
434 vap->iv_sta_ps(vap, 0);
435 break;
436 default:
437 goto invalid;
438 }
439 ieee80211_sync_curchan(ic);
440 if (ostate != IEEE80211_S_RUN)
441 sta_swbmiss_start(vap);
442 /*
443 * When 802.1x is not in use mark the port authorized
444 * at this point so traffic can flow.
445 */
446 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
447 ieee80211_node_authorize(ni);
448 /*
449 * Fake association when joining an existing bss.
450 *
451 * Don't do this if we're doing SLEEP->RUN.
452 */
453 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP)
454 ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN));
455 break;
456 case IEEE80211_S_CSA:
457 if (ostate != IEEE80211_S_RUN)
458 goto invalid;
459 break;
460 case IEEE80211_S_SLEEP:
461 sta_swbmiss_start(vap);
462 vap->iv_sta_ps(vap, 1);
463 break;
464 default:
465 invalid:
466 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
467 "%s: unexpected state transition %s -> %s\n", __func__,
468 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
469 break;
470 }
471 return 0;
472 }
473
474 /*
475 * Return non-zero if the frame is an echo of a multicast
476 * frame sent by ourself. The dir is known to be DSTODS.
477 */
478 static __inline int
isdstods_mcastecho(struct ieee80211vap * vap,const struct ieee80211_frame * wh)479 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
480 {
481 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh)
482 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh)
483 const uint8_t *sa;
484
485 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
486
487 if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
488 return 0;
489 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
490 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
491 #undef WH4
492 #undef QWH4
493 }
494
495 /*
496 * Return non-zero if the frame is an echo of a multicast
497 * frame sent by ourself. The dir is known to be FROMDS.
498 */
499 static __inline int
isfromds_mcastecho(struct ieee80211vap * vap,const struct ieee80211_frame * wh)500 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
501 {
502 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
503
504 if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
505 return 0;
506 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
507 }
508
509 /*
510 * Decide if a received management frame should be
511 * printed when debugging is enabled. This filters some
512 * of the less interesting frames that come frequently
513 * (e.g. beacons).
514 */
515 static __inline int
doprint(struct ieee80211vap * vap,int subtype)516 doprint(struct ieee80211vap *vap, int subtype)
517 {
518 switch (subtype) {
519 case IEEE80211_FC0_SUBTYPE_BEACON:
520 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
521 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
522 return 0;
523 }
524 return 1;
525 }
526
527 /*
528 * Process a received frame. The node associated with the sender
529 * should be supplied. If nothing was found in the node table then
530 * the caller is assumed to supply a reference to iv_bss instead.
531 * The RSSI and a timestamp are also supplied. The RSSI data is used
532 * during AP scanning to select a AP to associate with; it can have
533 * any units so long as values have consistent units and higher values
534 * mean ``better signal''. The receive timestamp is currently not used
535 * by the 802.11 layer.
536 */
537 static int
sta_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)538 sta_input(struct ieee80211_node *ni, struct mbuf *m,
539 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
540 {
541 struct ieee80211vap *vap = ni->ni_vap;
542 struct ieee80211com *ic = ni->ni_ic;
543 struct ifnet *ifp = vap->iv_ifp;
544 struct ieee80211_frame *wh;
545 struct ieee80211_key *key;
546 struct ether_header *eh;
547 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
548 uint8_t dir, type, subtype, qos;
549 uint8_t *bssid;
550
551 if (m->m_flags & M_AMPDU_MPDU) {
552 /*
553 * Fastpath for A-MPDU reorder q resubmission. Frames
554 * w/ M_AMPDU_MPDU marked have already passed through
555 * here but were received out of order and been held on
556 * the reorder queue. When resubmitted they are marked
557 * with the M_AMPDU_MPDU flag and we can bypass most of
558 * the normal processing.
559 */
560 wh = mtod(m, struct ieee80211_frame *);
561 type = IEEE80211_FC0_TYPE_DATA;
562 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
563 subtype = IEEE80211_FC0_SUBTYPE_QOS;
564 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
565 goto resubmit_ampdu;
566 }
567
568 KASSERT(ni != NULL, ("null node"));
569 ni->ni_inact = ni->ni_inact_reload;
570
571 type = -1; /* undefined */
572
573 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
574 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
575 ni->ni_macaddr, NULL,
576 "too short (1): len %u", m->m_pkthdr.len);
577 vap->iv_stats.is_rx_tooshort++;
578 goto out;
579 }
580 /*
581 * Bit of a cheat here, we use a pointer for a 3-address
582 * frame format but don't reference fields past outside
583 * ieee80211_frame_min w/o first validating the data is
584 * present.
585 */
586 wh = mtod(m, struct ieee80211_frame *);
587
588 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
589 IEEE80211_FC0_VERSION_0) {
590 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
591 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
592 wh->i_fc[0], wh->i_fc[1]);
593 vap->iv_stats.is_rx_badversion++;
594 goto err;
595 }
596
597 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
598 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
599 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
600 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
601 bssid = wh->i_addr2;
602 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
603 /* not interested in */
604 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
605 bssid, NULL, "%s", "not to bss");
606 vap->iv_stats.is_rx_wrongbss++;
607 goto out;
608 }
609
610 /*
611 * Some devices may be in a promiscuous mode
612 * where they receive frames for multiple station
613 * addresses.
614 *
615 * If we receive a data frame that isn't
616 * destined to our VAP MAC, drop it.
617 *
618 * XXX TODO: This is only enforced when not scanning;
619 * XXX it assumes a software-driven scan will put the NIC
620 * XXX into a "no data frames" mode before setting this
621 * XXX flag. Otherwise it may be possible that we'll still
622 * XXX process data frames whilst scanning.
623 */
624 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1))
625 && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) {
626 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
627 #if defined(__DragonFly__)
628 bssid, NULL, "not to cur sta: lladdr=%s, addr1=%s",
629 ether_sprintf(IF_LLADDR(ifp)),
630 ether_sprintf(wh->i_addr1));
631 #else
632 bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D",
633 IF_LLADDR(ifp), ":", wh->i_addr1, ":");
634 #endif
635 vap->iv_stats.is_rx_wrongbss++;
636 goto out;
637 }
638
639 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
640 ni->ni_noise = nf;
641 if ( IEEE80211_HAS_SEQ(type, subtype) &&
642 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
643 uint8_t tid = ieee80211_gettid(wh);
644 if (IEEE80211_QOS_HAS_SEQ(wh) &&
645 TID_TO_WME_AC(tid) >= WME_AC_VI)
646 ic->ic_wme.wme_hipri_traffic++;
647 if (! ieee80211_check_rxseq(ni, wh, bssid))
648 goto out;
649 }
650 }
651
652 switch (type) {
653 case IEEE80211_FC0_TYPE_DATA:
654 hdrspace = ieee80211_hdrspace(ic, wh);
655 if (m->m_len < hdrspace &&
656 (m = m_pullup(m, hdrspace)) == NULL) {
657 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
658 ni->ni_macaddr, NULL,
659 "data too short: expecting %u", hdrspace);
660 vap->iv_stats.is_rx_tooshort++;
661 goto out; /* XXX */
662 }
663 /*
664 * Handle A-MPDU re-ordering. If the frame is to be
665 * processed directly then ieee80211_ampdu_reorder
666 * will return 0; otherwise it has consumed the mbuf
667 * and we should do nothing more with it.
668 */
669 if ((m->m_flags & M_AMPDU) &&
670 (dir == IEEE80211_FC1_DIR_FROMDS ||
671 dir == IEEE80211_FC1_DIR_DSTODS) &&
672 ieee80211_ampdu_reorder(ni, m) != 0) {
673 m = NULL;
674 goto out;
675 }
676 resubmit_ampdu:
677 if (dir == IEEE80211_FC1_DIR_FROMDS) {
678 if ((ifp->if_flags & IFF_SIMPLEX) &&
679 isfromds_mcastecho(vap, wh)) {
680 /*
681 * In IEEE802.11 network, multicast
682 * packets sent from "me" are broadcast
683 * from the AP; silently discard for
684 * SIMPLEX interface.
685 */
686 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
687 wh, "data", "%s", "multicast echo");
688 vap->iv_stats.is_rx_mcastecho++;
689 goto out;
690 }
691 if ((vap->iv_flags & IEEE80211_F_DWDS) &&
692 IEEE80211_IS_MULTICAST(wh->i_addr1)) {
693 /*
694 * DWDS sta's must drop 3-address mcast frames
695 * as they will be sent separately as a 4-addr
696 * frame. Accepting the 3-addr frame will
697 * confuse the bridge into thinking the sending
698 * sta is located at the end of WDS link.
699 */
700 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
701 "3-address data", "%s", "DWDS enabled");
702 vap->iv_stats.is_rx_mcastecho++;
703 goto out;
704 }
705 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
706 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
707 IEEE80211_DISCARD(vap,
708 IEEE80211_MSG_INPUT, wh, "4-address data",
709 "%s", "DWDS not enabled");
710 vap->iv_stats.is_rx_wrongdir++;
711 goto out;
712 }
713 if ((ifp->if_flags & IFF_SIMPLEX) &&
714 isdstods_mcastecho(vap, wh)) {
715 /*
716 * In IEEE802.11 network, multicast
717 * packets sent from "me" are broadcast
718 * from the AP; silently discard for
719 * SIMPLEX interface.
720 */
721 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
722 "4-address data", "%s", "multicast echo");
723 vap->iv_stats.is_rx_mcastecho++;
724 goto out;
725 }
726 } else {
727 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
728 "data", "incorrect dir 0x%x", dir);
729 vap->iv_stats.is_rx_wrongdir++;
730 goto out;
731 }
732
733 /*
734 * Handle privacy requirements. Note that we
735 * must not be preempted from here until after
736 * we (potentially) call ieee80211_crypto_demic;
737 * otherwise we may violate assumptions in the
738 * crypto cipher modules used to do delayed update
739 * of replay sequence numbers.
740 */
741 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
742 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
743 /*
744 * Discard encrypted frames when privacy is off.
745 */
746 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
747 wh, "WEP", "%s", "PRIVACY off");
748 vap->iv_stats.is_rx_noprivacy++;
749 IEEE80211_NODE_STAT(ni, rx_noprivacy);
750 goto out;
751 }
752 key = ieee80211_crypto_decap(ni, m, hdrspace);
753 if (key == NULL) {
754 /* NB: stats+msgs handled in crypto_decap */
755 IEEE80211_NODE_STAT(ni, rx_wepfail);
756 goto out;
757 }
758 wh = mtod(m, struct ieee80211_frame *);
759 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
760 } else {
761 /* XXX M_WEP and IEEE80211_F_PRIVACY */
762 key = NULL;
763 }
764
765 /*
766 * Save QoS bits for use below--before we strip the header.
767 */
768 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
769 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
770 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
771 ((struct ieee80211_qosframe *)wh)->i_qos[0];
772 } else
773 qos = 0;
774
775 /*
776 * Next up, any fragmentation.
777 */
778 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
779 m = ieee80211_defrag(ni, m, hdrspace);
780 if (m == NULL) {
781 /* Fragment dropped or frame not complete yet */
782 goto out;
783 }
784 }
785 wh = NULL; /* no longer valid, catch any uses */
786
787 /*
788 * Next strip any MSDU crypto bits.
789 */
790 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
791 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
792 ni->ni_macaddr, "data", "%s", "demic error");
793 vap->iv_stats.is_rx_demicfail++;
794 IEEE80211_NODE_STAT(ni, rx_demicfail);
795 goto out;
796 }
797
798 /* copy to listener after decrypt */
799 if (ieee80211_radiotap_active_vap(vap))
800 ieee80211_radiotap_rx(vap, m);
801 need_tap = 0;
802
803 /*
804 * Finally, strip the 802.11 header.
805 */
806 m = ieee80211_decap(vap, m, hdrspace);
807 if (m == NULL) {
808 /* XXX mask bit to check for both */
809 /* don't count Null data frames as errors */
810 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
811 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
812 goto out;
813 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
814 ni->ni_macaddr, "data", "%s", "decap error");
815 vap->iv_stats.is_rx_decap++;
816 IEEE80211_NODE_STAT(ni, rx_decap);
817 goto err;
818 }
819 eh = mtod(m, struct ether_header *);
820 if (!ieee80211_node_is_authorized(ni)) {
821 /*
822 * Deny any non-PAE frames received prior to
823 * authorization. For open/shared-key
824 * authentication the port is mark authorized
825 * after authentication completes. For 802.1x
826 * the port is not marked authorized by the
827 * authenticator until the handshake has completed.
828 */
829 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
830 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
831 eh->ether_shost, "data",
832 "unauthorized port: ether type 0x%x len %u",
833 eh->ether_type, m->m_pkthdr.len);
834 vap->iv_stats.is_rx_unauth++;
835 IEEE80211_NODE_STAT(ni, rx_unauth);
836 goto err;
837 }
838 } else {
839 /*
840 * When denying unencrypted frames, discard
841 * any non-PAE frames received without encryption.
842 */
843 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
844 (key == NULL && (m->m_flags & M_WEP) == 0) &&
845 eh->ether_type != htons(ETHERTYPE_PAE)) {
846 /*
847 * Drop unencrypted frames.
848 */
849 vap->iv_stats.is_rx_unencrypted++;
850 IEEE80211_NODE_STAT(ni, rx_unencrypted);
851 goto out;
852 }
853 }
854 /* XXX require HT? */
855 if (qos & IEEE80211_QOS_AMSDU) {
856 m = ieee80211_decap_amsdu(ni, m);
857 if (m == NULL)
858 return IEEE80211_FC0_TYPE_DATA;
859 } else {
860 #ifdef IEEE80211_SUPPORT_SUPERG
861 m = ieee80211_decap_fastframe(vap, ni, m);
862 if (m == NULL)
863 return IEEE80211_FC0_TYPE_DATA;
864 #endif
865 }
866 ieee80211_deliver_data(vap, ni, m);
867 return IEEE80211_FC0_TYPE_DATA;
868
869 case IEEE80211_FC0_TYPE_MGT:
870 vap->iv_stats.is_rx_mgmt++;
871 IEEE80211_NODE_STAT(ni, rx_mgmt);
872 if (dir != IEEE80211_FC1_DIR_NODS) {
873 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
874 wh, "data", "incorrect dir 0x%x", dir);
875 vap->iv_stats.is_rx_wrongdir++;
876 goto err;
877 }
878 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
879 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
880 ni->ni_macaddr, "mgt", "too short: len %u",
881 m->m_pkthdr.len);
882 vap->iv_stats.is_rx_tooshort++;
883 goto out;
884 }
885 #ifdef IEEE80211_DEBUG
886 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
887 ieee80211_msg_dumppkts(vap)) {
888 if_printf(ifp, "received %s from %s rssi %d\n",
889 ieee80211_mgt_subtype_name(subtype),
890 ether_sprintf(wh->i_addr2), rssi);
891 }
892 #endif
893 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
894 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
895 /*
896 * Only shared key auth frames with a challenge
897 * should be encrypted, discard all others.
898 */
899 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
900 wh, ieee80211_mgt_subtype_name(subtype),
901 "%s", "WEP set but not permitted");
902 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
903 goto out;
904 }
905 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
906 /*
907 * Discard encrypted frames when privacy is off.
908 */
909 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
910 wh, "mgt", "%s", "WEP set but PRIVACY off");
911 vap->iv_stats.is_rx_noprivacy++;
912 goto out;
913 }
914 hdrspace = ieee80211_hdrspace(ic, wh);
915 key = ieee80211_crypto_decap(ni, m, hdrspace);
916 if (key == NULL) {
917 /* NB: stats+msgs handled in crypto_decap */
918 goto out;
919 }
920 wh = mtod(m, struct ieee80211_frame *);
921 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
922 }
923 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
924 goto out;
925
926 case IEEE80211_FC0_TYPE_CTL:
927 vap->iv_stats.is_rx_ctl++;
928 IEEE80211_NODE_STAT(ni, rx_ctrl);
929 vap->iv_recv_ctl(ni, m, subtype);
930 goto out;
931
932 default:
933 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
934 wh, NULL, "bad frame type 0x%x", type);
935 /* should not come here */
936 break;
937 }
938 err:
939 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
940 out:
941 if (m != NULL) {
942 if (need_tap && ieee80211_radiotap_active_vap(vap))
943 ieee80211_radiotap_rx(vap, m);
944 m_freem(m);
945 }
946 return type;
947 }
948
949 static void
sta_auth_open(struct ieee80211_node * ni,struct ieee80211_frame * wh,int rssi,int nf,uint16_t seq,uint16_t status)950 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
951 int rssi, int nf, uint16_t seq, uint16_t status)
952 {
953 struct ieee80211vap *vap = ni->ni_vap;
954
955 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
956 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
957 ni->ni_macaddr, "open auth",
958 "bad sta auth mode %u", ni->ni_authmode);
959 vap->iv_stats.is_rx_bad_auth++; /* XXX */
960 return;
961 }
962 if (vap->iv_state != IEEE80211_S_AUTH ||
963 seq != IEEE80211_AUTH_OPEN_RESPONSE) {
964 vap->iv_stats.is_rx_bad_auth++;
965 return;
966 }
967 if (status != 0) {
968 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
969 ni, "open auth failed (reason %d)", status);
970 vap->iv_stats.is_rx_auth_fail++;
971 vap->iv_stats.is_rx_authfail_code = status;
972 ieee80211_new_state(vap, IEEE80211_S_SCAN,
973 IEEE80211_SCAN_FAIL_STATUS);
974 } else
975 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
976 }
977
978 static void
sta_auth_shared(struct ieee80211_node * ni,struct ieee80211_frame * wh,uint8_t * frm,uint8_t * efrm,int rssi,int nf,uint16_t seq,uint16_t status)979 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
980 uint8_t *frm, uint8_t *efrm, int rssi, int nf,
981 uint16_t seq, uint16_t status)
982 {
983 struct ieee80211vap *vap = ni->ni_vap;
984 uint8_t *challenge;
985 int estatus;
986
987 /*
988 * NB: this can happen as we allow pre-shared key
989 * authentication to be enabled w/o wep being turned
990 * on so that configuration of these can be done
991 * in any order. It may be better to enforce the
992 * ordering in which case this check would just be
993 * for sanity/consistency.
994 */
995 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
996 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
997 ni->ni_macaddr, "shared key auth",
998 "%s", " PRIVACY is disabled");
999 estatus = IEEE80211_STATUS_ALG;
1000 goto bad;
1001 }
1002 /*
1003 * Pre-shared key authentication is evil; accept
1004 * it only if explicitly configured (it is supported
1005 * mainly for compatibility with clients like OS X).
1006 */
1007 if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1008 ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1009 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1010 ni->ni_macaddr, "shared key auth",
1011 "bad sta auth mode %u", ni->ni_authmode);
1012 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1013 estatus = IEEE80211_STATUS_ALG;
1014 goto bad;
1015 }
1016
1017 challenge = NULL;
1018 if (frm + 1 < efrm) {
1019 if ((frm[1] + 2) > (efrm - frm)) {
1020 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1021 ni->ni_macaddr, "shared key auth",
1022 "ie %d/%ld too long",
1023 frm[0], (frm[1] + 2) - (efrm - frm));
1024 vap->iv_stats.is_rx_bad_auth++;
1025 estatus = IEEE80211_STATUS_CHALLENGE;
1026 goto bad;
1027 }
1028 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1029 challenge = frm;
1030 frm += frm[1] + 2;
1031 }
1032 switch (seq) {
1033 case IEEE80211_AUTH_SHARED_CHALLENGE:
1034 case IEEE80211_AUTH_SHARED_RESPONSE:
1035 if (challenge == NULL) {
1036 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1037 ni->ni_macaddr, "shared key auth",
1038 "%s", "no challenge");
1039 vap->iv_stats.is_rx_bad_auth++;
1040 estatus = IEEE80211_STATUS_CHALLENGE;
1041 goto bad;
1042 }
1043 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1044 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1045 ni->ni_macaddr, "shared key auth",
1046 "bad challenge len %d", challenge[1]);
1047 vap->iv_stats.is_rx_bad_auth++;
1048 estatus = IEEE80211_STATUS_CHALLENGE;
1049 goto bad;
1050 }
1051 default:
1052 break;
1053 }
1054 if (vap->iv_state != IEEE80211_S_AUTH)
1055 return;
1056 switch (seq) {
1057 case IEEE80211_AUTH_SHARED_PASS:
1058 if (ni->ni_challenge != NULL) {
1059 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
1060 ni->ni_challenge = NULL;
1061 }
1062 if (status != 0) {
1063 IEEE80211_NOTE_FRAME(vap,
1064 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1065 "shared key auth failed (reason %d)", status);
1066 vap->iv_stats.is_rx_auth_fail++;
1067 vap->iv_stats.is_rx_authfail_code = status;
1068 return;
1069 }
1070 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1071 break;
1072 case IEEE80211_AUTH_SHARED_CHALLENGE:
1073 if (!ieee80211_alloc_challenge(ni))
1074 return;
1075 /* XXX could optimize by passing recvd challenge */
1076 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1077 IEEE80211_SEND_MGMT(ni,
1078 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1079 break;
1080 default:
1081 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1082 wh, "shared key auth", "bad seq %d", seq);
1083 vap->iv_stats.is_rx_bad_auth++;
1084 return;
1085 }
1086 return;
1087 bad:
1088 /*
1089 * Kick the state machine. This short-circuits
1090 * using the mgt frame timeout to trigger the
1091 * state transition.
1092 */
1093 if (vap->iv_state == IEEE80211_S_AUTH)
1094 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1095 IEEE80211_SCAN_FAIL_STATUS);
1096 }
1097
1098 int
ieee80211_parse_wmeparams(struct ieee80211vap * vap,uint8_t * frm,const struct ieee80211_frame * wh)1099 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1100 const struct ieee80211_frame *wh)
1101 {
1102 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
1103 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1104 u_int len = frm[1], qosinfo;
1105 int i;
1106
1107 if (len < sizeof(struct ieee80211_wme_param)-2) {
1108 IEEE80211_DISCARD_IE(vap,
1109 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1110 wh, "WME", "too short, len %u", len);
1111 return -1;
1112 }
1113 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1114 qosinfo &= WME_QOSINFO_COUNT;
1115 /* XXX do proper check for wraparound */
1116 if (qosinfo == wme->wme_wmeChanParams.cap_info)
1117 return 0;
1118 frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1119 for (i = 0; i < WME_NUM_AC; i++) {
1120 struct wmeParams *wmep =
1121 &wme->wme_wmeChanParams.cap_wmeParams[i];
1122 /* NB: ACI not used */
1123 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
1124 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
1125 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
1126 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
1127 wmep->wmep_txopLimit = le16dec(frm+2);
1128 frm += 4;
1129 }
1130 wme->wme_wmeChanParams.cap_info = qosinfo;
1131 return 1;
1132 #undef MS
1133 }
1134
1135 /*
1136 * Process 11h Channel Switch Announcement (CSA) ie. If this
1137 * is the first CSA then initiate the switch. Otherwise we
1138 * track state and trigger completion and/or cancel of the switch.
1139 * XXX should be public for IBSS use
1140 */
1141 static void
ieee80211_parse_csaparams(struct ieee80211vap * vap,uint8_t * frm,const struct ieee80211_frame * wh)1142 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1143 const struct ieee80211_frame *wh)
1144 {
1145 struct ieee80211com *ic = vap->iv_ic;
1146 const struct ieee80211_csa_ie *csa =
1147 (const struct ieee80211_csa_ie *) frm;
1148
1149 KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1150 ("state %s", ieee80211_state_name[vap->iv_state]));
1151
1152 if (csa->csa_mode > 1) {
1153 IEEE80211_DISCARD_IE(vap,
1154 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1155 wh, "CSA", "invalid mode %u", csa->csa_mode);
1156 return;
1157 }
1158 IEEE80211_LOCK(ic);
1159 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1160 /*
1161 * Convert the channel number to a channel reference. We
1162 * try first to preserve turbo attribute of the current
1163 * channel then fallback. Note this will not work if the
1164 * CSA specifies a channel that requires a band switch (e.g.
1165 * 11a => 11g). This is intentional as 11h is defined only
1166 * for 5GHz/11a and because the switch does not involve a
1167 * reassociation, protocol state (capabilities, negotated
1168 * rates, etc) may/will be wrong.
1169 */
1170 struct ieee80211_channel *c =
1171 ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1172 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1173 if (c == NULL) {
1174 c = ieee80211_find_channel_byieee(ic,
1175 csa->csa_newchan,
1176 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1177 if (c == NULL) {
1178 IEEE80211_DISCARD_IE(vap,
1179 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1180 wh, "CSA", "invalid channel %u",
1181 csa->csa_newchan);
1182 goto done;
1183 }
1184 }
1185 #if IEEE80211_CSA_COUNT_MIN > 0
1186 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1187 /*
1188 * Require at least IEEE80211_CSA_COUNT_MIN count to
1189 * reduce the risk of being redirected by a fabricated
1190 * CSA. If a valid CSA is dropped we'll still get a
1191 * beacon miss when the AP leaves the channel so we'll
1192 * eventually follow to the new channel.
1193 *
1194 * NOTE: this violates the 11h spec that states that
1195 * count may be any value and if 0 then a switch
1196 * should happen asap.
1197 */
1198 IEEE80211_DISCARD_IE(vap,
1199 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1200 wh, "CSA", "count %u too small, must be >= %u",
1201 csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1202 goto done;
1203 }
1204 #endif
1205 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1206 } else {
1207 /*
1208 * Validate this ie against the initial CSA. We require
1209 * mode and channel not change and the count must be
1210 * monotonically decreasing. This may be pointless and
1211 * canceling the switch as a result may be too paranoid but
1212 * in the worst case if we drop out of CSA because of this
1213 * and the AP does move then we'll just end up taking a
1214 * beacon miss and scan to find the AP.
1215 *
1216 * XXX may want <= on count as we also process ProbeResp
1217 * frames and those may come in w/ the same count as the
1218 * previous beacon; but doing so leaves us open to a stuck
1219 * count until we add a dead-man timer
1220 */
1221 if (!(csa->csa_count < ic->ic_csa_count &&
1222 csa->csa_mode == ic->ic_csa_mode &&
1223 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1224 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1225 "CSA ie mismatch, initial ie <%d,%d,%d>, "
1226 "this ie <%d,%d,%d>", ic->ic_csa_mode,
1227 ic->ic_csa_newchan->ic_ieee, ic->ic_csa_count,
1228 csa->csa_mode, csa->csa_newchan, csa->csa_count);
1229 ieee80211_csa_cancelswitch(ic);
1230 } else {
1231 if (csa->csa_count <= 1)
1232 ieee80211_csa_completeswitch(ic);
1233 else
1234 ic->ic_csa_count = csa->csa_count;
1235 }
1236 }
1237 done:
1238 IEEE80211_UNLOCK(ic);
1239 }
1240
1241 /*
1242 * Return non-zero if a background scan may be continued:
1243 * o bg scan is active
1244 * o no channel switch is pending
1245 * o there has not been any traffic recently
1246 * o no full-offload scan support (no need for explicitly continuing scan then)
1247 *
1248 * Note we do not check if there is an administrative enable;
1249 * this is only done to start the scan. We assume that any
1250 * change in state will be accompanied by a request to cancel
1251 * active scans which will otherwise cause this test to fail.
1252 */
1253 static __inline int
contbgscan(struct ieee80211vap * vap)1254 contbgscan(struct ieee80211vap *vap)
1255 {
1256 struct ieee80211com *ic = vap->iv_ic;
1257
1258 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1259 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1260 !(vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) &&
1261 vap->iv_state == IEEE80211_S_RUN && /* XXX? */
1262 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1263 }
1264
1265 /*
1266 * Return non-zero if a backgrond scan may be started:
1267 * o bg scanning is administratively enabled
1268 * o no channel switch is pending
1269 * o we are not boosted on a dynamic turbo channel
1270 * o there has not been a scan recently
1271 * o there has not been any traffic recently (don't check if full-offload scan)
1272 */
1273 static __inline int
startbgscan(struct ieee80211vap * vap)1274 startbgscan(struct ieee80211vap *vap)
1275 {
1276 struct ieee80211com *ic = vap->iv_ic;
1277
1278 return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1279 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1280 #ifdef IEEE80211_SUPPORT_SUPERG
1281 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1282 #endif
1283 ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1284 ((vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) ||
1285 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)));
1286 }
1287
1288 static void
sta_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)1289 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
1290 const struct ieee80211_rx_stats *rxs,
1291 int rssi, int nf)
1292 {
1293 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1294 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1295 struct ieee80211vap *vap = ni->ni_vap;
1296 struct ieee80211com *ic = ni->ni_ic;
1297 struct ieee80211_channel *rxchan = ic->ic_curchan;
1298 struct ieee80211_frame *wh;
1299 uint8_t *frm, *efrm;
1300 uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1301 uint8_t rate;
1302 int ht_state_change = 0;
1303
1304 wh = mtod(m0, struct ieee80211_frame *);
1305 frm = (uint8_t *)&wh[1];
1306 efrm = mtod(m0, uint8_t *) + m0->m_len;
1307 switch (subtype) {
1308 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1309 case IEEE80211_FC0_SUBTYPE_BEACON: {
1310 struct ieee80211_scanparams scan;
1311 struct ieee80211_channel *c;
1312 /*
1313 * We process beacon/probe response frames:
1314 * o when scanning, or
1315 * o station mode when associated (to collect state
1316 * updates such as 802.11g slot time)
1317 * Frames otherwise received are discarded.
1318 */
1319 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1320 vap->iv_stats.is_rx_mgtdiscard++;
1321 return;
1322 }
1323
1324 /* Override RX channel as appropriate */
1325 if (rxs != NULL) {
1326 c = ieee80211_lookup_channel_rxstatus(vap, rxs);
1327 if (c != NULL)
1328 rxchan = c;
1329 }
1330
1331 /* XXX probe response in sta mode when !scanning? */
1332 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) {
1333 if (! (ic->ic_flags & IEEE80211_F_SCAN))
1334 vap->iv_stats.is_beacon_bad++;
1335 return;
1336 }
1337
1338 /*
1339 * Count frame now that we know it's to be processed.
1340 */
1341 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1342 vap->iv_stats.is_rx_beacon++; /* XXX remove */
1343 IEEE80211_NODE_STAT(ni, rx_beacons);
1344 } else
1345 IEEE80211_NODE_STAT(ni, rx_proberesp);
1346 /*
1347 * When operating in station mode, check for state updates.
1348 * Be careful to ignore beacons received while doing a
1349 * background scan. We consider only 11g/WMM stuff right now.
1350 */
1351 if (ni->ni_associd != 0 &&
1352 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1353 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1354 /* record tsf of last beacon */
1355 memcpy(ni->ni_tstamp.data, scan.tstamp,
1356 sizeof(ni->ni_tstamp));
1357 /* count beacon frame for s/w bmiss handling */
1358 vap->iv_swbmiss_count++;
1359 vap->iv_bmiss_count = 0;
1360 if (ni->ni_erp != scan.erp) {
1361 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1362 wh->i_addr2,
1363 "erp change: was 0x%x, now 0x%x",
1364 ni->ni_erp, scan.erp);
1365 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1366 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1367 ic->ic_flags |= IEEE80211_F_USEPROT;
1368 else
1369 ic->ic_flags &= ~IEEE80211_F_USEPROT;
1370 ni->ni_erp = scan.erp;
1371 /* XXX statistic */
1372 /* XXX driver notification */
1373 }
1374 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1375 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1376 wh->i_addr2,
1377 "capabilities change: was 0x%x, now 0x%x",
1378 ni->ni_capinfo, scan.capinfo);
1379 /*
1380 * NB: we assume short preamble doesn't
1381 * change dynamically
1382 */
1383 ieee80211_set_shortslottime(ic,
1384 IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1385 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1386 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1387 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1388 /* XXX statistic */
1389 }
1390 if (scan.wme != NULL &&
1391 (ni->ni_flags & IEEE80211_NODE_QOS) &&
1392 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
1393 ieee80211_wme_updateparams(vap);
1394 #ifdef IEEE80211_SUPPORT_SUPERG
1395 if (scan.ath != NULL)
1396 ieee80211_parse_athparams(ni, scan.ath, wh);
1397 #endif
1398 if (scan.htcap != NULL && scan.htinfo != NULL &&
1399 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1400 /* XXX state changes? */
1401 if (ieee80211_ht_updateparams(ni,
1402 scan.htcap, scan.htinfo))
1403 ht_state_change = 1;
1404 }
1405 if (scan.quiet)
1406 ic->ic_set_quiet(ni, scan.quiet);
1407
1408 if (scan.tim != NULL) {
1409 struct ieee80211_tim_ie *tim =
1410 (struct ieee80211_tim_ie *) scan.tim;
1411 /*
1412 * XXX Check/debug this code; see if it's about
1413 * the right time to force the VAP awake if we
1414 * receive a frame destined for us?
1415 */
1416 int aid = IEEE80211_AID(ni->ni_associd);
1417 int ix = aid / NBBY;
1418 int min = tim->tim_bitctl &~ 1;
1419 int max = tim->tim_len + min - 4;
1420 int tim_ucast = 0, tim_mcast = 0;
1421
1422 /*
1423 * Only do this for unicast traffic in the TIM
1424 * The multicast traffic notification for
1425 * the scan notification stuff should occur
1426 * differently.
1427 */
1428 if (min <= ix && ix <= max &&
1429 isset(tim->tim_bitmap - min, aid)) {
1430 tim_ucast = 1;
1431 }
1432
1433 /*
1434 * Do a separate notification
1435 * for the multicast bit being set.
1436 */
1437 if (tim->tim_bitctl & 1) {
1438 tim_mcast = 1;
1439 }
1440
1441 /*
1442 * If the TIM indicates there's traffic for
1443 * us then get us out of STA mode powersave.
1444 */
1445 if (tim_ucast == 1) {
1446
1447 /*
1448 * Wake us out of SLEEP state if we're
1449 * in it; and if we're doing bgscan
1450 * then wake us out of STA powersave.
1451 */
1452 ieee80211_sta_tim_notify(vap, 1);
1453
1454 /*
1455 * This is preventing us from
1456 * continuing a bgscan; because it
1457 * tricks the contbgscan()
1458 * routine to think there's always
1459 * traffic for us.
1460 *
1461 * I think we need both an RX and
1462 * TX ic_lastdata field.
1463 */
1464 ic->ic_lastdata = ticks;
1465 }
1466
1467 ni->ni_dtim_count = tim->tim_count;
1468 ni->ni_dtim_period = tim->tim_period;
1469 }
1470 if (scan.csa != NULL &&
1471 (vap->iv_flags & IEEE80211_F_DOTH))
1472 ieee80211_parse_csaparams(vap, scan.csa, wh);
1473 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1474 /*
1475 * No CSA ie or 11h disabled, but a channel
1476 * switch is pending; drop out so we aren't
1477 * stuck in CSA state. If the AP really is
1478 * moving we'll get a beacon miss and scan.
1479 */
1480 IEEE80211_LOCK(ic);
1481 ieee80211_csa_cancelswitch(ic);
1482 IEEE80211_UNLOCK(ic);
1483 }
1484 /*
1485 * If scanning, pass the info to the scan module.
1486 * Otherwise, check if it's the right time to do
1487 * a background scan. Background scanning must
1488 * be enabled and we must not be operating in the
1489 * turbo phase of dynamic turbo mode. Then,
1490 * it's been a while since the last background
1491 * scan and if no data frames have come through
1492 * recently, kick off a scan. Note that this
1493 * is the mechanism by which a background scan
1494 * is started _and_ continued each time we
1495 * return on-channel to receive a beacon from
1496 * our ap.
1497 */
1498 if (ic->ic_flags & IEEE80211_F_SCAN) {
1499 ieee80211_add_scan(vap, rxchan,
1500 &scan, wh, subtype, rssi, nf);
1501 } else if (contbgscan(vap)) {
1502 ieee80211_bg_scan(vap, 0);
1503 } else if (startbgscan(vap)) {
1504 vap->iv_stats.is_scan_bg++;
1505 #if 0
1506 /* wakeup if we are sleeing */
1507 ieee80211_set_pwrsave(vap, 0);
1508 #endif
1509 ieee80211_bg_scan(vap, 0);
1510 }
1511
1512 /*
1513 * Put the station to sleep if we haven't seen
1514 * traffic in a while.
1515 */
1516 IEEE80211_LOCK(ic);
1517 ieee80211_sta_ps_timer_check(vap);
1518 IEEE80211_UNLOCK(ic);
1519
1520 /*
1521 * If we've had a channel width change (eg HT20<->HT40)
1522 * then schedule a delayed driver notification.
1523 */
1524 if (ht_state_change)
1525 ieee80211_update_chw(ic);
1526 return;
1527 }
1528 /*
1529 * If scanning, just pass information to the scan module.
1530 */
1531 if (ic->ic_flags & IEEE80211_F_SCAN) {
1532 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1533 /*
1534 * Actively scanning a channel marked passive;
1535 * send a probe request now that we know there
1536 * is 802.11 traffic present.
1537 *
1538 * XXX check if the beacon we recv'd gives
1539 * us what we need and suppress the probe req
1540 */
1541 ieee80211_probe_curchan(vap, 1);
1542 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1543 }
1544 ieee80211_add_scan(vap, rxchan, &scan, wh,
1545 subtype, rssi, nf);
1546 return;
1547 }
1548 break;
1549 }
1550
1551 case IEEE80211_FC0_SUBTYPE_AUTH: {
1552 uint16_t algo, seq, status;
1553 /*
1554 * auth frame format
1555 * [2] algorithm
1556 * [2] sequence
1557 * [2] status
1558 * [tlv*] challenge
1559 */
1560 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1561 algo = le16toh(*(uint16_t *)frm);
1562 seq = le16toh(*(uint16_t *)(frm + 2));
1563 status = le16toh(*(uint16_t *)(frm + 4));
1564 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1565 "recv auth frame with algorithm %d seq %d", algo, seq);
1566
1567 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1568 IEEE80211_DISCARD(vap,
1569 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1570 wh, "auth", "%s", "TKIP countermeasures enabled");
1571 vap->iv_stats.is_rx_auth_countermeasures++;
1572 if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1573 ieee80211_send_error(ni, wh->i_addr2,
1574 IEEE80211_FC0_SUBTYPE_AUTH,
1575 IEEE80211_REASON_MIC_FAILURE);
1576 }
1577 return;
1578 }
1579 if (algo == IEEE80211_AUTH_ALG_SHARED)
1580 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1581 seq, status);
1582 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1583 sta_auth_open(ni, wh, rssi, nf, seq, status);
1584 else {
1585 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1586 wh, "auth", "unsupported alg %d", algo);
1587 vap->iv_stats.is_rx_auth_unsupported++;
1588 return;
1589 }
1590 break;
1591 }
1592
1593 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1594 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1595 uint16_t capinfo, associd;
1596 uint16_t status;
1597
1598 if (vap->iv_state != IEEE80211_S_ASSOC) {
1599 vap->iv_stats.is_rx_mgtdiscard++;
1600 return;
1601 }
1602
1603 /*
1604 * asresp frame format
1605 * [2] capability information
1606 * [2] status
1607 * [2] association ID
1608 * [tlv] supported rates
1609 * [tlv] extended supported rates
1610 * [tlv] WME
1611 * [tlv] HT capabilities
1612 * [tlv] HT info
1613 */
1614 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1615 ni = vap->iv_bss;
1616 capinfo = le16toh(*(uint16_t *)frm);
1617 frm += 2;
1618 status = le16toh(*(uint16_t *)frm);
1619 frm += 2;
1620 if (status != 0) {
1621 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1622 wh->i_addr2, "%sassoc failed (reason %d)",
1623 ISREASSOC(subtype) ? "re" : "", status);
1624 vap->iv_stats.is_rx_auth_fail++; /* XXX */
1625 return;
1626 }
1627 associd = le16toh(*(uint16_t *)frm);
1628 frm += 2;
1629
1630 rates = xrates = wme = htcap = htinfo = NULL;
1631 while (efrm - frm > 1) {
1632 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1633 switch (*frm) {
1634 case IEEE80211_ELEMID_RATES:
1635 rates = frm;
1636 break;
1637 case IEEE80211_ELEMID_XRATES:
1638 xrates = frm;
1639 break;
1640 case IEEE80211_ELEMID_HTCAP:
1641 htcap = frm;
1642 break;
1643 case IEEE80211_ELEMID_HTINFO:
1644 htinfo = frm;
1645 break;
1646 case IEEE80211_ELEMID_VENDOR:
1647 if (iswmeoui(frm))
1648 wme = frm;
1649 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1650 /*
1651 * Accept pre-draft HT ie's if the
1652 * standard ones have not been seen.
1653 */
1654 if (ishtcapoui(frm)) {
1655 if (htcap == NULL)
1656 htcap = frm;
1657 } else if (ishtinfooui(frm)) {
1658 if (htinfo == NULL)
1659 htinfo = frm;
1660 }
1661 }
1662 /* XXX Atheros OUI support */
1663 break;
1664 }
1665 frm += frm[1] + 2;
1666 }
1667
1668 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1669 if (xrates != NULL)
1670 IEEE80211_VERIFY_ELEMENT(xrates,
1671 IEEE80211_RATE_MAXSIZE - rates[1], return);
1672 rate = ieee80211_setup_rates(ni, rates, xrates,
1673 IEEE80211_F_JOIN |
1674 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1675 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1676 if (rate & IEEE80211_RATE_BASIC) {
1677 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1678 wh->i_addr2,
1679 "%sassoc failed (rate set mismatch)",
1680 ISREASSOC(subtype) ? "re" : "");
1681 vap->iv_stats.is_rx_assoc_norate++;
1682 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1683 IEEE80211_SCAN_FAIL_STATUS);
1684 return;
1685 }
1686
1687 ni->ni_capinfo = capinfo;
1688 ni->ni_associd = associd;
1689 if (ni->ni_jointime == 0)
1690 ni->ni_jointime = time_uptime;
1691 if (wme != NULL &&
1692 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
1693 ni->ni_flags |= IEEE80211_NODE_QOS;
1694 ieee80211_wme_updateparams(vap);
1695 } else
1696 ni->ni_flags &= ~IEEE80211_NODE_QOS;
1697 /*
1698 * Setup HT state according to the negotiation.
1699 *
1700 * NB: shouldn't need to check if HT use is enabled but some
1701 * ap's send back HT ie's even when we don't indicate we
1702 * are HT capable in our AssocReq.
1703 */
1704 if (htcap != NULL && htinfo != NULL &&
1705 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1706 ieee80211_ht_node_init(ni);
1707 ieee80211_ht_updateparams(ni, htcap, htinfo);
1708 ieee80211_setup_htrates(ni, htcap,
1709 IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1710 ieee80211_setup_basic_htrates(ni, htinfo);
1711 ieee80211_node_setuptxparms(ni);
1712 ieee80211_ratectl_node_init(ni);
1713 }
1714
1715 /*
1716 * Always initialise FF/superg state; we can use this
1717 * for doing A-MSDU encapsulation as well.
1718 */
1719 #ifdef IEEE80211_SUPPORT_SUPERG
1720 ieee80211_ff_node_init(ni);
1721 #endif
1722
1723 /*
1724 * Configure state now that we are associated.
1725 *
1726 * XXX may need different/additional driver callbacks?
1727 */
1728 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1729 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1730 ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
1731 ic->ic_flags &= ~IEEE80211_F_USEBARKER;
1732 } else {
1733 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
1734 ic->ic_flags |= IEEE80211_F_USEBARKER;
1735 }
1736 ieee80211_set_shortslottime(ic,
1737 IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1738 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1739 /*
1740 * Honor ERP protection.
1741 *
1742 * NB: ni_erp should zero for non-11g operation.
1743 */
1744 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1745 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1746 ic->ic_flags |= IEEE80211_F_USEPROT;
1747 else
1748 ic->ic_flags &= ~IEEE80211_F_USEPROT;
1749 IEEE80211_NOTE_MAC(vap,
1750 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1751 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
1752 ISREASSOC(subtype) ? "re" : "",
1753 IEEE80211_NODE_AID(ni),
1754 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1755 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1756 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1757 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1758 ni->ni_flags & IEEE80211_NODE_HT ?
1759 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1760 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1761 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1762 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1763 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1764 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1765 ", fast-frames" : "",
1766 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1767 ", turbo" : ""
1768 );
1769 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1770 break;
1771 }
1772
1773 case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1774 uint16_t reason;
1775
1776 if (vap->iv_state == IEEE80211_S_SCAN) {
1777 vap->iv_stats.is_rx_mgtdiscard++;
1778 return;
1779 }
1780 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1781 /* NB: can happen when in promiscuous mode */
1782 vap->iv_stats.is_rx_mgtdiscard++;
1783 break;
1784 }
1785
1786 /*
1787 * deauth frame format
1788 * [2] reason
1789 */
1790 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1791 reason = le16toh(*(uint16_t *)frm);
1792
1793 vap->iv_stats.is_rx_deauth++;
1794 vap->iv_stats.is_rx_deauth_code = reason;
1795 IEEE80211_NODE_STAT(ni, rx_deauth);
1796
1797 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1798 "recv deauthenticate (reason: %d (%s))", reason,
1799 ieee80211_reason_to_string(reason));
1800 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1801 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1802 break;
1803 }
1804
1805 case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1806 uint16_t reason;
1807
1808 if (vap->iv_state != IEEE80211_S_RUN &&
1809 vap->iv_state != IEEE80211_S_ASSOC &&
1810 vap->iv_state != IEEE80211_S_AUTH) {
1811 vap->iv_stats.is_rx_mgtdiscard++;
1812 return;
1813 }
1814 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1815 /* NB: can happen when in promiscuous mode */
1816 vap->iv_stats.is_rx_mgtdiscard++;
1817 break;
1818 }
1819
1820 /*
1821 * disassoc frame format
1822 * [2] reason
1823 */
1824 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1825 reason = le16toh(*(uint16_t *)frm);
1826
1827 vap->iv_stats.is_rx_disassoc++;
1828 vap->iv_stats.is_rx_disassoc_code = reason;
1829 IEEE80211_NODE_STAT(ni, rx_disassoc);
1830
1831 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1832 "recv disassociate (reason: %d (%s))", reason,
1833 ieee80211_reason_to_string(reason));
1834 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1835 break;
1836 }
1837
1838 case IEEE80211_FC0_SUBTYPE_ACTION:
1839 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
1840 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
1841 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1842 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1843 wh, NULL, "%s", "not for us");
1844 vap->iv_stats.is_rx_mgtdiscard++;
1845 } else if (vap->iv_state != IEEE80211_S_RUN) {
1846 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1847 wh, NULL, "wrong state %s",
1848 ieee80211_state_name[vap->iv_state]);
1849 vap->iv_stats.is_rx_mgtdiscard++;
1850 } else {
1851 if (ieee80211_parse_action(ni, m0) == 0)
1852 (void)ic->ic_recv_action(ni, wh, frm, efrm);
1853 }
1854 break;
1855
1856 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1857 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1858 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1859 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
1860 case IEEE80211_FC0_SUBTYPE_ATIM:
1861 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1862 wh, NULL, "%s", "not handled");
1863 vap->iv_stats.is_rx_mgtdiscard++;
1864 break;
1865
1866 default:
1867 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1868 wh, "mgt", "subtype 0x%x not handled", subtype);
1869 vap->iv_stats.is_rx_badsubtype++;
1870 break;
1871 }
1872 #undef ISREASSOC
1873 #undef ISPROBE
1874 }
1875
1876 static void
sta_recv_ctl(struct ieee80211_node * ni,struct mbuf * m,int subtype)1877 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1878 {
1879 switch (subtype) {
1880 case IEEE80211_FC0_SUBTYPE_BAR:
1881 ieee80211_recv_bar(ni, m);
1882 break;
1883 }
1884 }
1885