1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 /*
29 * IEEE 802.11 Station mode support.
30 */
31 #include "opt_inet.h"
32 #include "opt_wlan.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/mbuf.h>
37 #include <sys/malloc.h>
38 #include <sys/kernel.h>
39
40 #include <sys/socket.h>
41 #include <sys/sockio.h>
42 #include <sys/endian.h>
43 #include <sys/errno.h>
44 #include <sys/proc.h>
45 #include <sys/sysctl.h>
46
47 #include <net/if.h>
48 #include <net/if_media.h>
49 #include <net/if_llc.h>
50 #include <net/if_dl.h>
51 #include <net/if_var.h>
52 #include <net/if_private.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 #include <net80211/ieee80211_sta.h>
65 #include <net80211/ieee80211_vht.h>
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 *,
71 const struct ieee80211_rx_stats *, int, int);
72 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
73 int subtype, const struct ieee80211_rx_stats *, int rssi, int nf);
74 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
75
76 void
ieee80211_sta_attach(struct ieee80211com * ic)77 ieee80211_sta_attach(struct ieee80211com *ic)
78 {
79 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
80 }
81
82 void
ieee80211_sta_detach(struct ieee80211com * ic)83 ieee80211_sta_detach(struct ieee80211com *ic)
84 {
85 }
86
87 static void
sta_vdetach(struct ieee80211vap * vap)88 sta_vdetach(struct ieee80211vap *vap)
89 {
90 }
91
92 static void
sta_vattach(struct ieee80211vap * vap)93 sta_vattach(struct ieee80211vap *vap)
94 {
95 vap->iv_newstate = sta_newstate;
96 vap->iv_input = sta_input;
97 vap->iv_recv_mgmt = sta_recv_mgmt;
98 vap->iv_recv_ctl = sta_recv_ctl;
99 vap->iv_opdetach = sta_vdetach;
100 vap->iv_bmiss = sta_beacon_miss;
101 }
102
103 /*
104 * Handle a beacon miss event. The common code filters out
105 * spurious events that can happen when scanning and/or before
106 * reaching RUN state.
107 */
108 static void
sta_beacon_miss(struct ieee80211vap * vap)109 sta_beacon_miss(struct ieee80211vap *vap)
110 {
111 struct ieee80211com *ic = vap->iv_ic;
112
113 IEEE80211_LOCK_ASSERT(ic);
114
115 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
116 KASSERT(vap->iv_state >= IEEE80211_S_RUN,
117 ("wrong state %s", ieee80211_state_name[vap->iv_state]));
118
119 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
120 "beacon miss, mode %s state %s\n",
121 ieee80211_opmode_name[vap->iv_opmode],
122 ieee80211_state_name[vap->iv_state]);
123
124 if (vap->iv_state == IEEE80211_S_CSA) {
125 /*
126 * A Channel Switch is pending; assume we missed the
127 * beacon that would've completed the process and just
128 * force the switch. If we made a mistake we'll not
129 * find the AP on the new channel and fall back to a
130 * normal scan.
131 */
132 ieee80211_csa_completeswitch(ic);
133 return;
134 }
135 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
136 /*
137 * Send a directed probe req before falling back to a
138 * scan; if we receive a response ic_bmiss_count will
139 * be reset. Some cards mistakenly report beacon miss
140 * so this avoids the expensive scan if the ap is
141 * still there.
142 */
143 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
144 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
145 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
146 return;
147 }
148
149 callout_stop(&vap->iv_swbmiss);
150 vap->iv_bmiss_count = 0;
151 vap->iv_stats.is_beacon_miss++;
152 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
153 #ifdef IEEE80211_SUPPORT_SUPERG
154
155 /*
156 * If we receive a beacon miss interrupt when using
157 * dynamic turbo, attempt to switch modes before
158 * reassociating.
159 */
160 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
161 ieee80211_dturbo_switch(vap,
162 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
163 #endif
164 /*
165 * Try to reassociate before scanning for a new ap.
166 */
167 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
168 } else {
169 /*
170 * Somebody else is controlling state changes (e.g.
171 * a user-mode app) don't do anything that would
172 * confuse them; just drop into scan mode so they'll
173 * notified of the state change and given control.
174 */
175 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
176 }
177 }
178
179 /*
180 * Handle deauth with reason. We retry only for
181 * the cases where we might succeed. Otherwise
182 * we downgrade the ap and scan.
183 */
184 static void
sta_authretry(struct ieee80211vap * vap,struct ieee80211_node * ni,int reason)185 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
186 {
187 switch (reason) {
188 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */
189 case IEEE80211_STATUS_TIMEOUT:
190 case IEEE80211_REASON_ASSOC_EXPIRE:
191 case IEEE80211_REASON_NOT_AUTHED:
192 case IEEE80211_REASON_NOT_ASSOCED:
193 case IEEE80211_REASON_ASSOC_LEAVE:
194 case IEEE80211_REASON_ASSOC_NOT_AUTHED:
195 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
196 break;
197 default:
198 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
199 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
200 ieee80211_check_scan_current(vap);
201 break;
202 }
203 }
204
205 static void
sta_swbmiss_start(struct ieee80211vap * vap)206 sta_swbmiss_start(struct ieee80211vap *vap)
207 {
208
209 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) {
210 /*
211 * Start s/w beacon miss timer for devices w/o
212 * hardware support. We fudge a bit here since
213 * we're doing this in software.
214 */
215 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
216 2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval);
217 vap->iv_swbmiss_count = 0;
218 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
219 ieee80211_swbmiss, vap);
220 }
221 }
222
223 /*
224 * IEEE80211_M_STA vap state machine handler.
225 * This routine handles the main states in the 802.11 protocol.
226 */
227 static int
sta_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)228 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
229 {
230 struct ieee80211com *ic = vap->iv_ic;
231 struct ieee80211_node *ni;
232 enum ieee80211_state ostate;
233
234 IEEE80211_LOCK_ASSERT(ic);
235
236 ostate = vap->iv_state;
237 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
238 __func__, ieee80211_state_name[ostate],
239 ieee80211_state_name[nstate], arg);
240 vap->iv_state = nstate; /* state transition */
241 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */
242 if (ostate != IEEE80211_S_SCAN)
243 ieee80211_cancel_scan(vap); /* background scan */
244 ni = vap->iv_bss; /* NB: no reference held */
245 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
246 callout_stop(&vap->iv_swbmiss);
247 switch (nstate) {
248 case IEEE80211_S_INIT:
249 switch (ostate) {
250 case IEEE80211_S_SLEEP:
251 /* XXX wakeup */
252 /* XXX driver hook to wakeup the hardware? */
253 case IEEE80211_S_RUN:
254 IEEE80211_SEND_MGMT(ni,
255 IEEE80211_FC0_SUBTYPE_DISASSOC,
256 IEEE80211_REASON_ASSOC_LEAVE);
257 ieee80211_sta_leave(ni);
258 break;
259 case IEEE80211_S_ASSOC:
260 IEEE80211_SEND_MGMT(ni,
261 IEEE80211_FC0_SUBTYPE_DEAUTH,
262 IEEE80211_REASON_AUTH_LEAVE);
263 break;
264 case IEEE80211_S_SCAN:
265 ieee80211_cancel_scan(vap);
266 break;
267 default:
268 break;
269 }
270 if (ostate != IEEE80211_S_INIT) {
271 /* NB: optimize INIT -> INIT case */
272 ieee80211_reset_bss(vap);
273 }
274 if (vap->iv_auth->ia_detach != NULL)
275 vap->iv_auth->ia_detach(vap);
276 break;
277 case IEEE80211_S_SCAN:
278 switch (ostate) {
279 case IEEE80211_S_INIT:
280 /*
281 * Initiate a scan. We can come here as a result
282 * of an IEEE80211_IOC_SCAN_REQ too in which case
283 * the vap will be marked with IEEE80211_FEXT_SCANREQ
284 * and the scan request parameters will be present
285 * in iv_scanreq. Otherwise we do the default.
286 */
287 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
288 ieee80211_check_scan(vap,
289 vap->iv_scanreq_flags,
290 vap->iv_scanreq_duration,
291 vap->iv_scanreq_mindwell,
292 vap->iv_scanreq_maxdwell,
293 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
294 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
295 } else
296 ieee80211_check_scan_current(vap);
297 break;
298 case IEEE80211_S_SCAN:
299 case IEEE80211_S_AUTH:
300 case IEEE80211_S_ASSOC:
301 /*
302 * These can happen either because of a timeout
303 * on an assoc/auth response or because of a
304 * change in state that requires a reset. For
305 * the former we're called with a non-zero arg
306 * that is the cause for the failure; pass this
307 * to the scan code so it can update state.
308 * Otherwise trigger a new scan unless we're in
309 * manual roaming mode in which case an application
310 * must issue an explicit scan request.
311 */
312 if (arg != 0)
313 ieee80211_scan_assoc_fail(vap,
314 vap->iv_bss->ni_macaddr, arg);
315 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
316 ieee80211_check_scan_current(vap);
317 break;
318 case IEEE80211_S_SLEEP: /* beacon miss */
319 /*
320 * XXX if in sleep we need to wakeup the hardware.
321 */
322 /* FALLTHROUGH */
323 case IEEE80211_S_RUN: /* beacon miss */
324 /*
325 * Beacon miss. Notify user space and if not
326 * under control of a user application (roaming
327 * manual) kick off a scan to re-connect.
328 */
329
330 ieee80211_sta_leave(ni);
331 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
332 ieee80211_check_scan_current(vap);
333 break;
334 default:
335 goto invalid;
336 }
337 break;
338 case IEEE80211_S_AUTH:
339 switch (ostate) {
340 case IEEE80211_S_INIT:
341 case IEEE80211_S_SCAN:
342 IEEE80211_SEND_MGMT(ni,
343 IEEE80211_FC0_SUBTYPE_AUTH, 1);
344 break;
345 case IEEE80211_S_AUTH:
346 case IEEE80211_S_ASSOC:
347 switch (arg & 0xff) {
348 case IEEE80211_FC0_SUBTYPE_AUTH:
349 /* ??? */
350 IEEE80211_SEND_MGMT(ni,
351 IEEE80211_FC0_SUBTYPE_AUTH, 2);
352 break;
353 case IEEE80211_FC0_SUBTYPE_DEAUTH:
354 sta_authretry(vap, ni, arg>>8);
355 break;
356 }
357 break;
358 case IEEE80211_S_SLEEP:
359 case IEEE80211_S_RUN:
360 switch (arg & 0xff) {
361 case IEEE80211_FC0_SUBTYPE_AUTH:
362 IEEE80211_SEND_MGMT(ni,
363 IEEE80211_FC0_SUBTYPE_AUTH, 2);
364 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */
365 break;
366 case IEEE80211_FC0_SUBTYPE_DEAUTH:
367 ieee80211_sta_leave(ni);
368 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
369 /* try to reauth */
370 IEEE80211_SEND_MGMT(ni,
371 IEEE80211_FC0_SUBTYPE_AUTH, 1);
372 }
373 break;
374 }
375 break;
376 default:
377 goto invalid;
378 }
379 break;
380 case IEEE80211_S_ASSOC:
381 switch (ostate) {
382 case IEEE80211_S_AUTH:
383 case IEEE80211_S_ASSOC:
384 IEEE80211_SEND_MGMT(ni,
385 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
386 break;
387 case IEEE80211_S_SLEEP: /* cannot happen */
388 case IEEE80211_S_RUN:
389 ieee80211_sta_leave(ni);
390 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
391 IEEE80211_SEND_MGMT(ni, arg ?
392 IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
393 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
394 }
395 break;
396 default:
397 goto invalid;
398 }
399 break;
400 case IEEE80211_S_RUN:
401 if (vap->iv_flags & IEEE80211_F_WPA) {
402 /* XXX validate prerequisites */
403 }
404 switch (ostate) {
405 case IEEE80211_S_RUN:
406 case IEEE80211_S_CSA:
407 break;
408 case IEEE80211_S_AUTH: /* when join is done in fw */
409 case IEEE80211_S_ASSOC:
410 #ifdef IEEE80211_DEBUG
411 if (ieee80211_msg_debug(vap)) {
412 ieee80211_note(vap, "%s with %s ssid ",
413 (vap->iv_opmode == IEEE80211_M_STA ?
414 "associated" : "synchronized"),
415 ether_sprintf(ni->ni_bssid));
416 ieee80211_print_essid(vap->iv_bss->ni_essid,
417 ni->ni_esslen);
418 printf(" channel %d start %uMbit/s\n",
419 ieee80211_chan2ieee(ic, ic->ic_curchan),
420 ieee80211_node_get_txrate_kbit(ni) / 1000);
421 }
422 #endif
423 ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
424 ieee80211_notify_node_join(ni,
425 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
426 break;
427 case IEEE80211_S_SLEEP:
428 /* Wake up from sleep */
429 vap->iv_sta_ps(vap, 0);
430 break;
431 default:
432 goto invalid;
433 }
434 ieee80211_sync_curchan(ic);
435 if (ostate != IEEE80211_S_RUN)
436 sta_swbmiss_start(vap);
437 /*
438 * When 802.1x is not in use mark the port authorized
439 * at this point so traffic can flow.
440 */
441 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
442 ieee80211_node_authorize(ni);
443 /*
444 * Fake association when joining an existing bss.
445 *
446 * Don't do this if we're doing SLEEP->RUN.
447 */
448 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP)
449 ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN));
450 break;
451 case IEEE80211_S_CSA:
452 if (ostate != IEEE80211_S_RUN)
453 goto invalid;
454 break;
455 case IEEE80211_S_SLEEP:
456 sta_swbmiss_start(vap);
457 vap->iv_sta_ps(vap, 1);
458 break;
459 default:
460 invalid:
461 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
462 "%s: unexpected state transition %s -> %s\n", __func__,
463 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
464 break;
465 }
466 return 0;
467 }
468
469 /*
470 * Return non-zero if the frame is an echo of a multicast
471 * frame sent by ourself. The dir is known to be DSTODS.
472 */
473 static __inline int
isdstods_mcastecho(struct ieee80211vap * vap,const struct ieee80211_frame * wh)474 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
475 {
476 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh)
477 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh)
478 const uint8_t *sa;
479
480 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
481
482 if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
483 return 0;
484 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
485 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
486 #undef WH4
487 #undef QWH4
488 }
489
490 /*
491 * Return non-zero if the frame is an echo of a multicast
492 * frame sent by ourself. The dir is known to be FROMDS.
493 */
494 static __inline int
isfromds_mcastecho(struct ieee80211vap * vap,const struct ieee80211_frame * wh)495 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
496 {
497 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
498
499 if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
500 return 0;
501 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
502 }
503
504 /*
505 * Decide if a received management frame should be
506 * printed when debugging is enabled. This filters some
507 * of the less interesting frames that come frequently
508 * (e.g. beacons).
509 */
510 static __inline int
doprint(struct ieee80211vap * vap,int subtype)511 doprint(struct ieee80211vap *vap, int subtype)
512 {
513 switch (subtype) {
514 case IEEE80211_FC0_SUBTYPE_BEACON:
515 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
516 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
517 return 0;
518 }
519 return 1;
520 }
521
522 /*
523 * Process a received frame. The node associated with the sender
524 * should be supplied. If nothing was found in the node table then
525 * the caller is assumed to supply a reference to iv_bss instead.
526 * The RSSI and a timestamp are also supplied. The RSSI data is used
527 * during AP scanning to select a AP to associate with; it can have
528 * any units so long as values have consistent units and higher values
529 * mean ``better signal''. The receive timestamp is currently not used
530 * by the 802.11 layer.
531 */
532 static int
sta_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)533 sta_input(struct ieee80211_node *ni, struct mbuf *m,
534 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
535 {
536 struct ieee80211vap *vap = ni->ni_vap;
537 struct ieee80211com *ic = ni->ni_ic;
538 struct ifnet *ifp = vap->iv_ifp;
539 struct ieee80211_frame *wh;
540 struct ieee80211_key *key;
541 struct ether_header *eh;
542 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
543 uint8_t dir, type, subtype, qos;
544 uint8_t *bssid;
545 int is_hw_decrypted = 0;
546 int has_decrypted = 0;
547
548 KASSERT(ni != NULL, ("%s: null node, mbuf %p", __func__, m));
549
550 /* Early init in case of early error case. */
551 type = -1;
552
553 /*
554 * Bit of a cheat here, we use a pointer for a 3-address
555 * frame format but don't reference fields past outside
556 * ieee80211_frame_min (or other shorter frames) w/o first
557 * validating the data is present.
558 */
559 wh = mtod(m, struct ieee80211_frame *);
560
561 if (m->m_pkthdr.len < 2 || m->m_pkthdr.len < ieee80211_anyhdrsize(wh)) {
562 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
563 ni->ni_macaddr, NULL,
564 "too short (1): len %u", m->m_pkthdr.len);
565 vap->iv_stats.is_rx_tooshort++;
566 goto err;
567 }
568 if (!IEEE80211_IS_FC0_CHECK_VER(wh, IEEE80211_FC0_VERSION_0)) {
569 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
570 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
571 wh->i_fc[0], wh->i_fc[1]);
572 vap->iv_stats.is_rx_badversion++;
573 goto err;
574 }
575
576 /*
577 * Some devices do hardware decryption all the way through
578 * to pretending the frame wasn't encrypted in the first place.
579 * So, tag it appropriately so it isn't discarded inappropriately.
580 */
581 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
582 is_hw_decrypted = 1;
583
584 if (m->m_flags & M_AMPDU_MPDU) {
585 /*
586 * Fastpath for A-MPDU reorder q resubmission. Frames
587 * w/ M_AMPDU_MPDU marked have already passed through
588 * here but were received out of order and been held on
589 * the reorder queue. When resubmitted they are marked
590 * with the M_AMPDU_MPDU flag and we can bypass most of
591 * the normal processing.
592 */
593 type = IEEE80211_FC0_TYPE_DATA;
594 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
595 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA;
596 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
597 goto resubmit_ampdu;
598 }
599
600 ni->ni_inact = ni->ni_inact_reload;
601
602 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
603 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
604 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
605 /*
606 * Control frames are not folowing the header scheme of data and mgmt
607 * frames so we do not apply extra checks here.
608 * We probably should do checks on RA (+TA) where available for those
609 * too, but for now do not drop them.
610 */
611 if (type != IEEE80211_FC0_TYPE_CTL &&
612 (ic->ic_flags & IEEE80211_F_SCAN) == 0) {
613 bssid = wh->i_addr2;
614 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
615 /* not interested in */
616 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
617 bssid, NULL, "%s", "not to bss");
618 vap->iv_stats.is_rx_wrongbss++;
619 goto out;
620 }
621
622 /*
623 * Some devices may be in a promiscuous mode
624 * where they receive frames for multiple station
625 * addresses.
626 *
627 * If we receive a data frame that isn't
628 * destined to our VAP MAC, drop it.
629 *
630 * XXX TODO: This is only enforced when not scanning;
631 * XXX it assumes a software-driven scan will put the NIC
632 * XXX into a "no data frames" mode before setting this
633 * XXX flag. Otherwise it may be possible that we'll still
634 * XXX process data frames whilst scanning.
635 */
636 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1))
637 && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) {
638 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
639 bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D",
640 IF_LLADDR(ifp), ":", wh->i_addr1, ":");
641 vap->iv_stats.is_rx_wrongbss++;
642 goto out;
643 }
644
645 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
646 ni->ni_noise = nf;
647 if ( IEEE80211_HAS_SEQ(type, subtype) &&
648 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
649 uint8_t tid = ieee80211_gettid(wh);
650 if (IEEE80211_QOS_HAS_SEQ(wh) &&
651 TID_TO_WME_AC(tid) >= WME_AC_VI)
652 ic->ic_wme.wme_hipri_traffic++;
653 if (! ieee80211_check_rxseq(ni, wh, bssid, rxs))
654 goto out;
655 }
656 }
657
658 switch (type) {
659 case IEEE80211_FC0_TYPE_DATA:
660 hdrspace = ieee80211_hdrspace(ic, wh);
661 if (m->m_len < hdrspace &&
662 (m = m_pullup(m, hdrspace)) == NULL) {
663 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
664 ni->ni_macaddr, NULL,
665 "data too short: expecting %u", hdrspace);
666 vap->iv_stats.is_rx_tooshort++;
667 goto out; /* XXX */
668 }
669 /*
670 * Handle A-MPDU re-ordering. If the frame is to be
671 * processed directly then ieee80211_ampdu_reorder
672 * will return 0; otherwise it has consumed the mbuf
673 * and we should do nothing more with it.
674 */
675 if ((m->m_flags & M_AMPDU) &&
676 (dir == IEEE80211_FC1_DIR_FROMDS ||
677 dir == IEEE80211_FC1_DIR_DSTODS) &&
678 ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
679 m = NULL;
680 goto out;
681 }
682 resubmit_ampdu:
683 if (dir == IEEE80211_FC1_DIR_FROMDS) {
684 if ((ifp->if_flags & IFF_SIMPLEX) &&
685 isfromds_mcastecho(vap, wh)) {
686 /*
687 * In IEEE802.11 network, multicast
688 * packets sent from "me" are broadcast
689 * from the AP; silently discard for
690 * SIMPLEX interface.
691 */
692 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
693 wh, "data", "%s", "multicast echo");
694 vap->iv_stats.is_rx_mcastecho++;
695 goto out;
696 }
697 if ((vap->iv_flags & IEEE80211_F_DWDS) &&
698 IEEE80211_IS_MULTICAST(wh->i_addr1)) {
699 /*
700 * DWDS sta's must drop 3-address mcast frames
701 * as they will be sent separately as a 4-addr
702 * frame. Accepting the 3-addr frame will
703 * confuse the bridge into thinking the sending
704 * sta is located at the end of WDS link.
705 */
706 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
707 "3-address data", "%s", "DWDS enabled");
708 vap->iv_stats.is_rx_mcastecho++;
709 goto out;
710 }
711 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
712 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
713 IEEE80211_DISCARD(vap,
714 IEEE80211_MSG_INPUT, wh, "4-address data",
715 "%s", "DWDS not enabled");
716 vap->iv_stats.is_rx_wrongdir++;
717 goto out;
718 }
719 if ((ifp->if_flags & IFF_SIMPLEX) &&
720 isdstods_mcastecho(vap, wh)) {
721 /*
722 * In IEEE802.11 network, multicast
723 * packets sent from "me" are broadcast
724 * from the AP; silently discard for
725 * SIMPLEX interface.
726 */
727 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
728 "4-address data", "%s", "multicast echo");
729 vap->iv_stats.is_rx_mcastecho++;
730 goto out;
731 }
732 } else {
733 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
734 "data", "incorrect dir 0x%x", dir);
735 vap->iv_stats.is_rx_wrongdir++;
736 goto out;
737 }
738
739 /*
740 * Handle privacy requirements for hardware decryption
741 * devices.
742 *
743 * For those devices, a handful of things happen.
744 *
745 * + If IV has been stripped, then we can't run
746 * ieee80211_crypto_decap() - none of the key
747 * + If MIC has been stripped, we can't validate
748 * MIC here.
749 * + If MIC fails, then we need to communicate a
750 * MIC failure up to the stack - but we don't know
751 * which key was used.
752 */
753
754 /*
755 * Handle privacy requirements. Note that we
756 * must not be preempted from here until after
757 * we (potentially) call ieee80211_crypto_demic;
758 * otherwise we may violate assumptions in the
759 * crypto cipher modules used to do delayed update
760 * of replay sequence numbers.
761 */
762 if (is_hw_decrypted || IEEE80211_IS_PROTECTED(wh)) {
763 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
764 /*
765 * Discard encrypted frames when privacy is off.
766 */
767 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
768 wh, "WEP", "%s", "PRIVACY off");
769 vap->iv_stats.is_rx_noprivacy++;
770 IEEE80211_NODE_STAT(ni, rx_noprivacy);
771 goto out;
772 }
773 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
774 /* NB: stats+msgs handled in crypto_decap */
775 IEEE80211_NODE_STAT(ni, rx_wepfail);
776 goto out;
777 }
778 wh = mtod(m, struct ieee80211_frame *);
779 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
780 has_decrypted = 1;
781 } else {
782 /* XXX M_WEP and IEEE80211_F_PRIVACY */
783 key = NULL;
784 }
785
786 /*
787 * Save QoS bits for use below--before we strip the header.
788 */
789 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA)
790 qos = ieee80211_getqos(wh)[0];
791 else
792 qos = 0;
793
794 /*
795 * Next up, any fragmentation.
796 */
797 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
798 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
799 if (m == NULL) {
800 /* Fragment dropped or frame not complete yet */
801 goto out;
802 }
803 }
804 wh = NULL; /* no longer valid, catch any uses */
805
806 /*
807 * Next strip any MSDU crypto bits.
808 *
809 * Note: we can't do MIC stripping/verification if the
810 * upper layer has stripped it. We have to check MIC
811 * ourselves. So, key may be NULL, but we have to check
812 * the RX status.
813 */
814 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
815 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
816 ni->ni_macaddr, "data", "%s", "demic error");
817 vap->iv_stats.is_rx_demicfail++;
818 IEEE80211_NODE_STAT(ni, rx_demicfail);
819 goto out;
820 }
821
822 /* copy to listener after decrypt */
823 if (ieee80211_radiotap_active_vap(vap))
824 ieee80211_radiotap_rx(vap, m);
825 need_tap = 0;
826
827 /*
828 * Finally, strip the 802.11 header.
829 */
830 m = ieee80211_decap(vap, m, hdrspace, qos);
831 if (m == NULL) {
832 /* XXX mask bit to check for both */
833 /* don't count Null data frames as errors */
834 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
835 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
836 goto out;
837 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
838 ni->ni_macaddr, "data", "%s", "decap error");
839 vap->iv_stats.is_rx_decap++;
840 IEEE80211_NODE_STAT(ni, rx_decap);
841 goto err;
842 }
843 if (!(qos & IEEE80211_QOS_AMSDU))
844 eh = mtod(m, struct ether_header *);
845 else
846 eh = NULL;
847 if (!ieee80211_node_is_authorized(ni)) {
848 /*
849 * Deny any non-PAE frames received prior to
850 * authorization. For open/shared-key
851 * authentication the port is mark authorized
852 * after authentication completes. For 802.1x
853 * the port is not marked authorized by the
854 * authenticator until the handshake has completed.
855 */
856 if (eh == NULL ||
857 eh->ether_type != htons(ETHERTYPE_PAE)) {
858 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
859 ni->ni_macaddr, "data", "unauthorized or "
860 "unknown port: ether type 0x%x len %u",
861 eh == NULL ? -1 : eh->ether_type,
862 m->m_pkthdr.len);
863 vap->iv_stats.is_rx_unauth++;
864 IEEE80211_NODE_STAT(ni, rx_unauth);
865 goto err;
866 }
867 } else {
868 /*
869 * When denying unencrypted frames, discard
870 * any non-PAE frames received without encryption.
871 */
872 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
873 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
874 (is_hw_decrypted == 0) &&
875 (eh == NULL ||
876 eh->ether_type != htons(ETHERTYPE_PAE))) {
877 /*
878 * Drop unencrypted frames.
879 */
880 vap->iv_stats.is_rx_unencrypted++;
881 IEEE80211_NODE_STAT(ni, rx_unencrypted);
882 goto out;
883 }
884 }
885 /* XXX require HT? */
886 if (qos & IEEE80211_QOS_AMSDU) {
887 m = ieee80211_decap_amsdu(ni, m);
888 if (m == NULL)
889 return IEEE80211_FC0_TYPE_DATA;
890 } else {
891 #ifdef IEEE80211_SUPPORT_SUPERG
892 m = ieee80211_decap_fastframe(vap, ni, m);
893 if (m == NULL)
894 return IEEE80211_FC0_TYPE_DATA;
895 #endif
896 }
897 ieee80211_deliver_data(vap, ni, m);
898 return IEEE80211_FC0_TYPE_DATA;
899
900 case IEEE80211_FC0_TYPE_MGT:
901 vap->iv_stats.is_rx_mgmt++;
902 IEEE80211_NODE_STAT(ni, rx_mgmt);
903 if (dir != IEEE80211_FC1_DIR_NODS) {
904 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
905 wh, "data", "incorrect dir 0x%x", dir);
906 vap->iv_stats.is_rx_wrongdir++;
907 goto err;
908 }
909 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
910 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
911 ni->ni_macaddr, "mgt", "too short: len %u",
912 m->m_pkthdr.len);
913 vap->iv_stats.is_rx_tooshort++;
914 goto out;
915 }
916 #ifdef IEEE80211_DEBUG
917 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
918 ieee80211_msg_dumppkts(vap)) {
919 if_printf(ifp, "received %s from %s rssi %d\n",
920 ieee80211_mgt_subtype_name(subtype),
921 ether_sprintf(wh->i_addr2), rssi);
922 }
923 #endif
924
925 /*
926 * Note: See above for hardware offload privacy requirements.
927 * It also applies here.
928 */
929
930 /*
931 * Again, having encrypted flag set check would be good, but
932 * then we have to also handle crypto_decap() like above.
933 */
934 if (IEEE80211_IS_PROTECTED(wh)) {
935 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
936 /*
937 * Only shared key auth frames with a challenge
938 * should be encrypted, discard all others.
939 */
940 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
941 wh, ieee80211_mgt_subtype_name(subtype),
942 "%s", "WEP set but not permitted");
943 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
944 goto out;
945 }
946 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
947 /*
948 * Discard encrypted frames when privacy is off.
949 */
950 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
951 wh, "mgt", "%s", "WEP set but PRIVACY off");
952 vap->iv_stats.is_rx_noprivacy++;
953 goto out;
954 }
955 hdrspace = ieee80211_hdrspace(ic, wh);
956
957 /*
958 * Again, if IV/MIC was stripped, then this whole
959 * setup will fail. That's going to need some poking.
960 */
961 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
962 /* NB: stats+msgs handled in crypto_decap */
963 goto out;
964 }
965 has_decrypted = 1;
966 wh = mtod(m, struct ieee80211_frame *);
967 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
968 }
969 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
970 goto out;
971
972 case IEEE80211_FC0_TYPE_CTL:
973 vap->iv_stats.is_rx_ctl++;
974 IEEE80211_NODE_STAT(ni, rx_ctrl);
975 vap->iv_recv_ctl(ni, m, subtype);
976 goto out;
977
978 default:
979 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
980 wh, NULL, "bad frame type 0x%x", type);
981 /* should not come here */
982 break;
983 }
984 err:
985 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
986 out:
987 if (m != NULL) {
988 if (need_tap && ieee80211_radiotap_active_vap(vap))
989 ieee80211_radiotap_rx(vap, m);
990 m_freem(m);
991 }
992 return type;
993 }
994
995 static void
sta_auth_open(struct ieee80211_node * ni,struct ieee80211_frame * wh,int rssi,int nf,uint16_t seq,uint16_t status)996 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
997 int rssi, int nf, uint16_t seq, uint16_t status)
998 {
999 struct ieee80211vap *vap = ni->ni_vap;
1000
1001 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
1002 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1003 ni->ni_macaddr, "open auth",
1004 "bad sta auth mode %u", ni->ni_authmode);
1005 vap->iv_stats.is_rx_bad_auth++; /* XXX */
1006 return;
1007 }
1008 if (vap->iv_state != IEEE80211_S_AUTH ||
1009 seq != IEEE80211_AUTH_OPEN_RESPONSE) {
1010 vap->iv_stats.is_rx_bad_auth++;
1011 return;
1012 }
1013 if (status != 0) {
1014 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1015 ni, "open auth failed (reason %d)", status);
1016 vap->iv_stats.is_rx_auth_fail++;
1017 vap->iv_stats.is_rx_authfail_code = status;
1018 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1019 IEEE80211_SCAN_FAIL_STATUS);
1020 } else
1021 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1022 }
1023
1024 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)1025 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
1026 uint8_t *frm, uint8_t *efrm, int rssi, int nf,
1027 uint16_t seq, uint16_t status)
1028 {
1029 struct ieee80211vap *vap = ni->ni_vap;
1030 uint8_t *challenge;
1031
1032 /*
1033 * NB: this can happen as we allow pre-shared key
1034 * authentication to be enabled w/o wep being turned
1035 * on so that configuration of these can be done
1036 * in any order. It may be better to enforce the
1037 * ordering in which case this check would just be
1038 * for sanity/consistency.
1039 */
1040 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1041 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1042 ni->ni_macaddr, "shared key auth",
1043 "%s", " PRIVACY is disabled");
1044 goto bad;
1045 }
1046 /*
1047 * Pre-shared key authentication is evil; accept
1048 * it only if explicitly configured (it is supported
1049 * mainly for compatibility with clients like OS X).
1050 */
1051 if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1052 ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1053 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1054 ni->ni_macaddr, "shared key auth",
1055 "bad sta auth mode %u", ni->ni_authmode);
1056 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1057 goto bad;
1058 }
1059
1060 challenge = NULL;
1061 if (frm + 1 < efrm) {
1062 if ((frm[1] + 2) > (efrm - frm)) {
1063 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1064 ni->ni_macaddr, "shared key auth",
1065 "ie %d/%d too long",
1066 frm[0], (frm[1] + 2) - (efrm - frm));
1067 vap->iv_stats.is_rx_bad_auth++;
1068 goto bad;
1069 }
1070 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1071 challenge = frm;
1072 frm += frm[1] + 2;
1073 }
1074 switch (seq) {
1075 case IEEE80211_AUTH_SHARED_CHALLENGE:
1076 case IEEE80211_AUTH_SHARED_RESPONSE:
1077 if (challenge == NULL) {
1078 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1079 ni->ni_macaddr, "shared key auth",
1080 "%s", "no challenge");
1081 vap->iv_stats.is_rx_bad_auth++;
1082 goto bad;
1083 }
1084 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1085 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1086 ni->ni_macaddr, "shared key auth",
1087 "bad challenge len %d", challenge[1]);
1088 vap->iv_stats.is_rx_bad_auth++;
1089 goto bad;
1090 }
1091 default:
1092 break;
1093 }
1094 if (vap->iv_state != IEEE80211_S_AUTH)
1095 return;
1096 switch (seq) {
1097 case IEEE80211_AUTH_SHARED_PASS:
1098 if (ni->ni_challenge != NULL) {
1099 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
1100 ni->ni_challenge = NULL;
1101 }
1102 if (status != 0) {
1103 IEEE80211_NOTE_FRAME(vap,
1104 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1105 "shared key auth failed (reason %d)", status);
1106 vap->iv_stats.is_rx_auth_fail++;
1107 vap->iv_stats.is_rx_authfail_code = status;
1108 return;
1109 }
1110 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1111 break;
1112 case IEEE80211_AUTH_SHARED_CHALLENGE:
1113 if (!ieee80211_alloc_challenge(ni))
1114 return;
1115 /* XXX could optimize by passing recvd challenge */
1116 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1117 IEEE80211_SEND_MGMT(ni,
1118 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1119 break;
1120 default:
1121 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1122 wh, "shared key auth", "bad seq %d", seq);
1123 vap->iv_stats.is_rx_bad_auth++;
1124 return;
1125 }
1126 return;
1127 bad:
1128 /*
1129 * Kick the state machine. This short-circuits
1130 * using the mgt frame timeout to trigger the
1131 * state transition.
1132 */
1133 if (vap->iv_state == IEEE80211_S_AUTH)
1134 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1135 IEEE80211_SCAN_FAIL_STATUS);
1136 }
1137
1138 /*
1139 * Parse the WME IE for QoS and U-APSD information.
1140 *
1141 * Returns -1 if the IE isn't found, 1 if it's found.
1142 */
1143 int
ieee80211_parse_wmeie(uint8_t * frm,const struct ieee80211_frame * wh,struct ieee80211_node * ni)1144 ieee80211_parse_wmeie(uint8_t *frm, const struct ieee80211_frame *wh,
1145 struct ieee80211_node *ni)
1146 {
1147 u_int len = frm[1];
1148
1149 ni->ni_uapsd = 0;
1150
1151 if (len < sizeof(struct ieee80211_wme_param)-2) {
1152 IEEE80211_DISCARD_IE(ni->ni_vap,
1153 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1154 wh, "WME", "too short, len %u", len);
1155 return -1;
1156 }
1157
1158 ni->ni_uapsd = frm[WME_CAPINFO_IE_OFFSET];
1159
1160 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_POWER | IEEE80211_MSG_ASSOC,
1161 ni, "U-APSD settings from STA: 0x%02x", ni->ni_uapsd);
1162
1163 return 1;
1164 }
1165
1166 int
ieee80211_parse_wmeparams(struct ieee80211vap * vap,uint8_t * frm,const struct ieee80211_frame * wh,uint8_t * qosinfo)1167 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1168 const struct ieee80211_frame *wh, uint8_t *qosinfo)
1169 {
1170 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1171 u_int len = frm[1], qosinfo_count;
1172 int i;
1173
1174 *qosinfo = 0;
1175
1176 if (len < sizeof(struct ieee80211_wme_param)-2) {
1177 IEEE80211_DISCARD_IE(vap,
1178 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1179 wh, "WME", "too short, len %u", len);
1180 return -1;
1181 }
1182 *qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1183 qosinfo_count = *qosinfo & WME_QOSINFO_COUNT;
1184
1185 /* XXX do proper check for wraparound */
1186 if (qosinfo_count == wme->wme_wmeChanParams.cap_info)
1187 return 0;
1188 frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1189 for (i = 0; i < WME_NUM_AC; i++) {
1190 struct wmeParams *wmep =
1191 &wme->wme_wmeChanParams.cap_wmeParams[i];
1192 /* NB: ACI not used */
1193 wmep->wmep_acm = _IEEE80211_MASKSHIFT(frm[0], WME_PARAM_ACM);
1194 wmep->wmep_aifsn =
1195 _IEEE80211_MASKSHIFT(frm[0], WME_PARAM_AIFSN);
1196 wmep->wmep_logcwmin =
1197 _IEEE80211_MASKSHIFT(frm[1], WME_PARAM_LOGCWMIN);
1198 wmep->wmep_logcwmax =
1199 _IEEE80211_MASKSHIFT(frm[1], WME_PARAM_LOGCWMAX);
1200 wmep->wmep_txopLimit = le16dec(frm+2);
1201 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
1202 "%s: WME: %d: acm=%d aifsn=%d logcwmin=%d logcwmax=%d txopLimit=%d\n",
1203 __func__,
1204 i,
1205 wmep->wmep_acm,
1206 wmep->wmep_aifsn,
1207 wmep->wmep_logcwmin,
1208 wmep->wmep_logcwmax,
1209 wmep->wmep_txopLimit);
1210 frm += 4;
1211 }
1212 wme->wme_wmeChanParams.cap_info = qosinfo_count;
1213 return 1;
1214 }
1215
1216 /*
1217 * Process 11h Channel Switch Announcement (CSA) ie. If this
1218 * is the first CSA then initiate the switch. Otherwise we
1219 * track state and trigger completion and/or cancel of the switch.
1220 * XXX should be public for IBSS use
1221 */
1222 static void
ieee80211_parse_csaparams(struct ieee80211vap * vap,uint8_t * frm,const struct ieee80211_frame * wh)1223 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1224 const struct ieee80211_frame *wh)
1225 {
1226 struct ieee80211com *ic = vap->iv_ic;
1227 const struct ieee80211_csa_ie *csa =
1228 (const struct ieee80211_csa_ie *) frm;
1229
1230 KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1231 ("state %s", ieee80211_state_name[vap->iv_state]));
1232
1233 if (csa->csa_mode > 1) {
1234 IEEE80211_DISCARD_IE(vap,
1235 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1236 wh, "CSA", "invalid mode %u", csa->csa_mode);
1237 return;
1238 }
1239 IEEE80211_LOCK(ic);
1240 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1241 /*
1242 * Convert the channel number to a channel reference. We
1243 * try first to preserve turbo attribute of the current
1244 * channel then fallback. Note this will not work if the
1245 * CSA specifies a channel that requires a band switch (e.g.
1246 * 11a => 11g). This is intentional as 11h is defined only
1247 * for 5GHz/11a and because the switch does not involve a
1248 * reassociation, protocol state (capabilities, negotated
1249 * rates, etc) may/will be wrong.
1250 */
1251 struct ieee80211_channel *c =
1252 ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1253 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1254 if (c == NULL) {
1255 c = ieee80211_find_channel_byieee(ic,
1256 csa->csa_newchan,
1257 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1258 if (c == NULL) {
1259 IEEE80211_DISCARD_IE(vap,
1260 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1261 wh, "CSA", "invalid channel %u",
1262 csa->csa_newchan);
1263 goto done;
1264 }
1265 }
1266 #if IEEE80211_CSA_COUNT_MIN > 0
1267 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1268 /*
1269 * Require at least IEEE80211_CSA_COUNT_MIN count to
1270 * reduce the risk of being redirected by a fabricated
1271 * CSA. If a valid CSA is dropped we'll still get a
1272 * beacon miss when the AP leaves the channel so we'll
1273 * eventually follow to the new channel.
1274 *
1275 * NOTE: this violates the 11h spec that states that
1276 * count may be any value and if 0 then a switch
1277 * should happen asap.
1278 */
1279 IEEE80211_DISCARD_IE(vap,
1280 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1281 wh, "CSA", "count %u too small, must be >= %u",
1282 csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1283 goto done;
1284 }
1285 #endif
1286 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1287 } else {
1288 /*
1289 * Validate this ie against the initial CSA. We require
1290 * mode and channel not change and the count must be
1291 * monotonically decreasing. This may be pointless and
1292 * canceling the switch as a result may be too paranoid but
1293 * in the worst case if we drop out of CSA because of this
1294 * and the AP does move then we'll just end up taking a
1295 * beacon miss and scan to find the AP.
1296 *
1297 * XXX may want <= on count as we also process ProbeResp
1298 * frames and those may come in w/ the same count as the
1299 * previous beacon; but doing so leaves us open to a stuck
1300 * count until we add a dead-man timer
1301 */
1302 if (!(csa->csa_count < ic->ic_csa_count &&
1303 csa->csa_mode == ic->ic_csa_mode &&
1304 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1305 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1306 "CSA ie mismatch, initial ie <%d,%d,%d>, "
1307 "this ie <%d,%d,%d>", ic->ic_csa_mode,
1308 ic->ic_csa_newchan, ic->ic_csa_count,
1309 csa->csa_mode, csa->csa_newchan, csa->csa_count);
1310 ieee80211_csa_cancelswitch(ic);
1311 } else {
1312 if (csa->csa_count <= 1)
1313 ieee80211_csa_completeswitch(ic);
1314 else
1315 ic->ic_csa_count = csa->csa_count;
1316 }
1317 }
1318 done:
1319 IEEE80211_UNLOCK(ic);
1320 }
1321
1322 /*
1323 * Return non-zero if a background scan may be continued:
1324 * o bg scan is active
1325 * o no channel switch is pending
1326 * o there has not been any traffic recently
1327 * o no full-offload scan support (no need for explicitly continuing scan then)
1328 *
1329 * Note we do not check if there is an administrative enable;
1330 * this is only done to start the scan. We assume that any
1331 * change in state will be accompanied by a request to cancel
1332 * active scans which will otherwise cause this test to fail.
1333 */
1334 static __inline int
contbgscan(struct ieee80211vap * vap)1335 contbgscan(struct ieee80211vap *vap)
1336 {
1337 struct ieee80211com *ic = vap->iv_ic;
1338
1339 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1340 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1341 !(vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) &&
1342 vap->iv_state == IEEE80211_S_RUN && /* XXX? */
1343 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1344 }
1345
1346 /*
1347 * Return non-zero if a backgrond scan may be started:
1348 * o bg scanning is administratively enabled
1349 * o no channel switch is pending
1350 * o we are not boosted on a dynamic turbo channel
1351 * o there has not been a scan recently
1352 * o there has not been any traffic recently (don't check if full-offload scan)
1353 */
1354 static __inline int
startbgscan(struct ieee80211vap * vap)1355 startbgscan(struct ieee80211vap *vap)
1356 {
1357 struct ieee80211com *ic = vap->iv_ic;
1358
1359 return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1360 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1361 #ifdef IEEE80211_SUPPORT_SUPERG
1362 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1363 #endif
1364 ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1365 ((vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) ||
1366 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)));
1367 }
1368
1369 #ifdef notyet
1370 /*
1371 * Compare two quiet IEs and return if they are equivalent.
1372 *
1373 * The tbttcount isn't checked - that's not part of the configuration.
1374 */
1375 static int
compare_quiet_ie(const struct ieee80211_quiet_ie * q1,const struct ieee80211_quiet_ie * q2)1376 compare_quiet_ie(const struct ieee80211_quiet_ie *q1,
1377 const struct ieee80211_quiet_ie *q2)
1378 {
1379
1380 if (q1->period != q2->period)
1381 return (0);
1382 if (le16dec(&q1->duration) != le16dec(&q2->duration))
1383 return (0);
1384 if (le16dec(&q1->offset) != le16dec(&q2->offset))
1385 return (0);
1386 return (1);
1387 }
1388 #endif
1389
1390 static void
sta_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)1391 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
1392 const struct ieee80211_rx_stats *rxs,
1393 int rssi, int nf)
1394 {
1395 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1396 struct ieee80211vap *vap = ni->ni_vap;
1397 struct ieee80211com *ic = ni->ni_ic;
1398 struct ieee80211_channel *rxchan = ic->ic_curchan;
1399 struct ieee80211_frame *wh;
1400 int ht_state_change = 0, do_ht = 0;
1401 uint8_t *frm, *efrm;
1402 uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1403 uint8_t *vhtcap, *vhtopmode;
1404 uint8_t rate;
1405 uint8_t qosinfo;
1406
1407 wh = mtod(m0, struct ieee80211_frame *);
1408 frm = (uint8_t *)&wh[1];
1409 efrm = mtod(m0, uint8_t *) + m0->m_len;
1410 switch (subtype) {
1411 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1412 case IEEE80211_FC0_SUBTYPE_BEACON: {
1413 struct ieee80211_scanparams scan;
1414 struct ieee80211_channel *c;
1415 /*
1416 * We process beacon/probe response frames:
1417 * o when scanning, or
1418 * o station mode when associated (to collect state
1419 * updates such as 802.11g slot time)
1420 * Frames otherwise received are discarded.
1421 */
1422 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1423 vap->iv_stats.is_rx_mgtdiscard++;
1424 return;
1425 }
1426
1427 /* Override RX channel as appropriate */
1428 if (rxs != NULL) {
1429 c = ieee80211_lookup_channel_rxstatus(vap, rxs);
1430 if (c != NULL)
1431 rxchan = c;
1432 }
1433
1434 /* XXX probe response in sta mode when !scanning? */
1435 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) {
1436 if (! (ic->ic_flags & IEEE80211_F_SCAN))
1437 vap->iv_stats.is_beacon_bad++;
1438 return;
1439 }
1440
1441 /*
1442 * Count frame now that we know it's to be processed.
1443 */
1444 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1445 vap->iv_stats.is_rx_beacon++; /* XXX remove */
1446 IEEE80211_NODE_STAT(ni, rx_beacons);
1447 } else
1448 IEEE80211_NODE_STAT(ni, rx_proberesp);
1449 /*
1450 * When operating in station mode, check for state updates.
1451 * Be careful to ignore beacons received while doing a
1452 * background scan. We consider only 11g/WMM stuff right now.
1453 */
1454 if (ni->ni_associd != 0 &&
1455 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1456 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1457 /* record tsf of last beacon */
1458 memcpy(ni->ni_tstamp.data, scan.tstamp,
1459 sizeof(ni->ni_tstamp));
1460 /* count beacon frame for s/w bmiss handling */
1461 vap->iv_swbmiss_count++;
1462 vap->iv_bmiss_count = 0;
1463 if (ni->ni_erp != scan.erp) {
1464 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1465 wh->i_addr2,
1466 "erp change: was 0x%x, now 0x%x",
1467 ni->ni_erp, scan.erp);
1468 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1469 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1470 vap->iv_flags |= IEEE80211_F_USEPROT;
1471 else
1472 vap->iv_flags &= ~IEEE80211_F_USEPROT;
1473 ni->ni_erp = scan.erp;
1474 /* XXX statistic */
1475 /* driver notification */
1476 ieee80211_vap_update_erp_protmode(vap);
1477 }
1478 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1479 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1480 wh->i_addr2,
1481 "capabilities change: was 0x%x, now 0x%x",
1482 ni->ni_capinfo, scan.capinfo);
1483 /*
1484 * NB: we assume short preamble doesn't
1485 * change dynamically
1486 */
1487 ieee80211_vap_set_shortslottime(vap,
1488 IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1489 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1490 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1491 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1492 /* XXX statistic */
1493 }
1494 if (scan.wme != NULL &&
1495 (ni->ni_flags & IEEE80211_NODE_QOS)) {
1496 int _retval;
1497 if ((_retval = ieee80211_parse_wmeparams(vap,
1498 scan.wme, wh, &qosinfo)) >= 0) {
1499 if (qosinfo & WME_CAPINFO_UAPSD_EN)
1500 ni->ni_flags |=
1501 IEEE80211_NODE_UAPSD;
1502 if (_retval > 0)
1503 ieee80211_wme_updateparams(vap);
1504 }
1505 } else
1506 ni->ni_flags &= ~IEEE80211_NODE_UAPSD;
1507 #ifdef IEEE80211_SUPPORT_SUPERG
1508 if (scan.ath != NULL)
1509 ieee80211_parse_athparams(ni, scan.ath, wh);
1510 #endif
1511 if (scan.htcap != NULL && scan.htinfo != NULL &&
1512 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1513 /* XXX state changes? */
1514 ieee80211_ht_updateparams(ni,
1515 scan.htcap, scan.htinfo);
1516 do_ht = 1;
1517 }
1518 if (scan.vhtcap != NULL && scan.vhtopmode != NULL &&
1519 (vap->iv_vht_flags & IEEE80211_FVHT_VHT)) {
1520 /* XXX state changes? */
1521 ieee80211_vht_updateparams(ni,
1522 scan.vhtcap, scan.vhtopmode);
1523 do_ht = 1;
1524 }
1525 if (do_ht) {
1526 if (ieee80211_ht_updateparams_final(ni,
1527 scan.htcap, scan.htinfo))
1528 ht_state_change = 1;
1529 }
1530
1531 /*
1532 * If we have a quiet time IE then report it up to
1533 * the driver.
1534 *
1535 * Otherwise, inform the driver that the quiet time
1536 * IE has disappeared - only do that once rather than
1537 * spamming it each time.
1538 */
1539 if (scan.quiet) {
1540 ic->ic_set_quiet(ni, scan.quiet);
1541 ni->ni_quiet_ie_set = 1;
1542 memcpy(&ni->ni_quiet_ie, scan.quiet,
1543 sizeof(struct ieee80211_quiet_ie));
1544 } else {
1545 if (ni->ni_quiet_ie_set == 1)
1546 ic->ic_set_quiet(ni, NULL);
1547 ni->ni_quiet_ie_set = 0;
1548 bzero(&ni->ni_quiet_ie,
1549 sizeof(struct ieee80211_quiet_ie));
1550 }
1551
1552 if (scan.tim != NULL) {
1553 struct ieee80211_tim_ie *tim =
1554 (struct ieee80211_tim_ie *) scan.tim;
1555 /*
1556 * XXX Check/debug this code; see if it's about
1557 * the right time to force the VAP awake if we
1558 * receive a frame destined for us?
1559 */
1560 int aid = IEEE80211_AID(ni->ni_associd);
1561 int ix = aid / NBBY;
1562 int min = tim->tim_bitctl &~ 1;
1563 int max = tim->tim_len + min - 4;
1564 int tim_ucast = 0;
1565 #ifdef __notyet__
1566 int tim_mcast = 0;
1567 #endif
1568
1569 /*
1570 * Only do this for unicast traffic in the TIM
1571 * The multicast traffic notification for
1572 * the scan notification stuff should occur
1573 * differently.
1574 */
1575 if (min <= ix && ix <= max &&
1576 isset(tim->tim_bitmap - min, aid)) {
1577 tim_ucast = 1;
1578 }
1579
1580 #ifdef __notyet__
1581 /*
1582 * Do a separate notification
1583 * for the multicast bit being set.
1584 */
1585 if (tim->tim_bitctl & 1) {
1586 tim_mcast = 1;
1587 }
1588 #endif
1589
1590 /*
1591 * If the TIM indicates there's traffic for
1592 * us then get us out of STA mode powersave.
1593 */
1594 if (tim_ucast == 1) {
1595 /*
1596 * Wake us out of SLEEP state if we're
1597 * in it; and if we're doing bgscan
1598 * then wake us out of STA powersave.
1599 */
1600 ieee80211_sta_tim_notify(vap, 1);
1601
1602 /*
1603 * This is preventing us from
1604 * continuing a bgscan; because it
1605 * tricks the contbgscan()
1606 * routine to think there's always
1607 * traffic for us.
1608 *
1609 * I think we need both an RX and
1610 * TX ic_lastdata field.
1611 */
1612 ic->ic_lastdata = ticks;
1613 }
1614
1615 ni->ni_dtim_count = tim->tim_count;
1616 ni->ni_dtim_period = tim->tim_period;
1617 }
1618 if (scan.csa != NULL &&
1619 (vap->iv_flags & IEEE80211_F_DOTH))
1620 ieee80211_parse_csaparams(vap, scan.csa, wh);
1621 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1622 /*
1623 * No CSA ie or 11h disabled, but a channel
1624 * switch is pending; drop out so we aren't
1625 * stuck in CSA state. If the AP really is
1626 * moving we'll get a beacon miss and scan.
1627 */
1628 IEEE80211_LOCK(ic);
1629 ieee80211_csa_cancelswitch(ic);
1630 IEEE80211_UNLOCK(ic);
1631 }
1632 /*
1633 * If scanning, pass the info to the scan module.
1634 * Otherwise, check if it's the right time to do
1635 * a background scan. Background scanning must
1636 * be enabled and we must not be operating in the
1637 * turbo phase of dynamic turbo mode. Then,
1638 * it's been a while since the last background
1639 * scan and if no data frames have come through
1640 * recently, kick off a scan. Note that this
1641 * is the mechanism by which a background scan
1642 * is started _and_ continued each time we
1643 * return on-channel to receive a beacon from
1644 * our ap.
1645 */
1646 if (ic->ic_flags & IEEE80211_F_SCAN) {
1647 ieee80211_add_scan(vap, rxchan,
1648 &scan, wh, subtype, rssi, nf);
1649 } else if (contbgscan(vap)) {
1650 ieee80211_bg_scan(vap, 0);
1651 } else if (startbgscan(vap)) {
1652 vap->iv_stats.is_scan_bg++;
1653 #if 0
1654 /* wakeup if we are sleeing */
1655 ieee80211_set_pwrsave(vap, 0);
1656 #endif
1657 ieee80211_bg_scan(vap, 0);
1658 }
1659
1660 /*
1661 * Put the station to sleep if we haven't seen
1662 * traffic in a while.
1663 */
1664 IEEE80211_LOCK(ic);
1665 ieee80211_sta_ps_timer_check(vap);
1666 IEEE80211_UNLOCK(ic);
1667
1668 /*
1669 * If we've had a channel width change (eg HT20<->HT40)
1670 * then schedule a delayed driver notification.
1671 */
1672 if (ht_state_change)
1673 ieee80211_update_chw(ic);
1674 return;
1675 }
1676 /*
1677 * If scanning, just pass information to the scan module.
1678 */
1679 if (ic->ic_flags & IEEE80211_F_SCAN) {
1680 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1681 /*
1682 * Actively scanning a channel marked passive;
1683 * send a probe request now that we know there
1684 * is 802.11 traffic present.
1685 *
1686 * XXX check if the beacon we recv'd gives
1687 * us what we need and suppress the probe req
1688 */
1689 ieee80211_probe_curchan(vap, true);
1690 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1691 }
1692 ieee80211_add_scan(vap, rxchan, &scan, wh,
1693 subtype, rssi, nf);
1694 return;
1695 }
1696 break;
1697 }
1698
1699 case IEEE80211_FC0_SUBTYPE_AUTH: {
1700 uint16_t algo, seq, status;
1701 /*
1702 * auth frame format
1703 * [2] algorithm
1704 * [2] sequence
1705 * [2] status
1706 * [tlv*] challenge
1707 */
1708 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1709 algo = le16toh(*(uint16_t *)frm);
1710 seq = le16toh(*(uint16_t *)(frm + 2));
1711 status = le16toh(*(uint16_t *)(frm + 4));
1712 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1713 "recv auth frame with algorithm %d seq %d", algo, seq);
1714
1715 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1716 IEEE80211_DISCARD(vap,
1717 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1718 wh, "auth", "%s", "TKIP countermeasures enabled");
1719 vap->iv_stats.is_rx_auth_countermeasures++;
1720 if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1721 ieee80211_send_error(ni, wh->i_addr2,
1722 IEEE80211_FC0_SUBTYPE_AUTH,
1723 IEEE80211_REASON_MIC_FAILURE);
1724 }
1725 return;
1726 }
1727 if (algo == IEEE80211_AUTH_ALG_SHARED)
1728 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1729 seq, status);
1730 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1731 sta_auth_open(ni, wh, rssi, nf, seq, status);
1732 else {
1733 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1734 wh, "auth", "unsupported alg %d", algo);
1735 vap->iv_stats.is_rx_auth_unsupported++;
1736 return;
1737 }
1738 break;
1739 }
1740
1741 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1742 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1743 uint16_t capinfo, associd;
1744 uint16_t status;
1745
1746 if (vap->iv_state != IEEE80211_S_ASSOC) {
1747 vap->iv_stats.is_rx_mgtdiscard++;
1748 return;
1749 }
1750
1751 /*
1752 * asresp frame format
1753 * [2] capability information
1754 * [2] status
1755 * [2] association ID
1756 * [tlv] supported rates
1757 * [tlv] extended supported rates
1758 * [tlv] WME
1759 * [tlv] HT capabilities
1760 * [tlv] HT info
1761 */
1762 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1763 ni = vap->iv_bss;
1764 capinfo = le16toh(*(uint16_t *)frm);
1765 frm += 2;
1766 status = le16toh(*(uint16_t *)frm);
1767 frm += 2;
1768 if (status != 0) {
1769 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1770 wh->i_addr2, "%sassoc failed (reason %d)",
1771 ISREASSOC(subtype) ? "re" : "", status);
1772 vap->iv_stats.is_rx_auth_fail++; /* XXX */
1773 return;
1774 }
1775 associd = le16toh(*(uint16_t *)frm);
1776 frm += 2;
1777
1778 rates = xrates = wme = htcap = htinfo = NULL;
1779 vhtcap = vhtopmode = NULL;
1780 while (efrm - frm > 1) {
1781 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1782 switch (*frm) {
1783 case IEEE80211_ELEMID_RATES:
1784 rates = frm;
1785 break;
1786 case IEEE80211_ELEMID_XRATES:
1787 xrates = frm;
1788 break;
1789 case IEEE80211_ELEMID_HTCAP:
1790 htcap = frm;
1791 break;
1792 case IEEE80211_ELEMID_HTINFO:
1793 htinfo = frm;
1794 break;
1795 case IEEE80211_ELEMID_VENDOR:
1796 if (iswmeoui(frm))
1797 wme = frm;
1798 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1799 /*
1800 * Accept pre-draft HT ie's if the
1801 * standard ones have not been seen.
1802 */
1803 if (ishtcapoui(frm)) {
1804 if (htcap == NULL)
1805 htcap = frm;
1806 } else if (ishtinfooui(frm)) {
1807 if (htinfo == NULL)
1808 htinfo = frm;
1809 }
1810 }
1811 /* XXX Atheros OUI support */
1812 break;
1813 case IEEE80211_ELEMID_VHT_CAP:
1814 vhtcap = frm;
1815 break;
1816 case IEEE80211_ELEMID_VHT_OPMODE:
1817 vhtopmode = frm;
1818 break;
1819 }
1820 frm += frm[1] + 2;
1821 }
1822
1823 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1824 if (xrates != NULL)
1825 IEEE80211_VERIFY_ELEMENT(xrates,
1826 IEEE80211_RATE_MAXSIZE - rates[1], return);
1827 rate = ieee80211_setup_rates(ni, rates, xrates,
1828 IEEE80211_F_JOIN |
1829 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1830 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1831 if (rate & IEEE80211_RATE_BASIC) {
1832 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1833 wh->i_addr2,
1834 "%sassoc failed (rate set mismatch)",
1835 ISREASSOC(subtype) ? "re" : "");
1836 vap->iv_stats.is_rx_assoc_norate++;
1837 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1838 IEEE80211_SCAN_FAIL_STATUS);
1839 return;
1840 }
1841
1842 ni->ni_capinfo = capinfo;
1843 ni->ni_associd = associd;
1844 if (ni->ni_jointime == 0)
1845 ni->ni_jointime = time_uptime;
1846 if (wme != NULL &&
1847 ieee80211_parse_wmeparams(vap, wme, wh, &qosinfo) >= 0) {
1848 ni->ni_flags |= IEEE80211_NODE_QOS;
1849 ieee80211_wme_updateparams(vap);
1850 } else
1851 ni->ni_flags &= ~IEEE80211_NODE_QOS;
1852 /*
1853 * Setup HT state according to the negotiation.
1854 *
1855 * NB: shouldn't need to check if HT use is enabled but some
1856 * ap's send back HT ie's even when we don't indicate we
1857 * are HT capable in our AssocReq.
1858 */
1859 if (htcap != NULL && htinfo != NULL &&
1860 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1861 ieee80211_ht_node_init(ni);
1862 ieee80211_ht_updateparams(ni, htcap, htinfo);
1863
1864 if ((vhtcap != NULL) && (vhtopmode != NULL) &
1865 (vap->iv_vht_flags & IEEE80211_FVHT_VHT)) {
1866 /*
1867 * Log if we get a VHT assoc/reassoc response.
1868 * We aren't ready for 2GHz VHT support.
1869 */
1870 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) {
1871 printf("%s: peer %6D: VHT on 2GHz, ignoring\n",
1872 __func__,
1873 ni->ni_macaddr,
1874 ":");
1875 } else {
1876 ieee80211_vht_node_init(ni);
1877 ieee80211_vht_updateparams(ni, vhtcap, vhtopmode);
1878 ieee80211_setup_vht_rates(ni);
1879 }
1880 }
1881
1882 ieee80211_ht_updateparams_final(ni, htcap, htinfo);
1883 ieee80211_setup_htrates(ni, htcap,
1884 IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1885 ieee80211_setup_basic_htrates(ni, htinfo);
1886
1887 ieee80211_node_setuptxparms(ni);
1888 ieee80211_ratectl_node_init(ni);
1889 }
1890
1891 /*
1892 * Always initialise FF/superg state; we can use this
1893 * for doing A-MSDU encapsulation as well.
1894 */
1895 #ifdef IEEE80211_SUPPORT_SUPERG
1896 ieee80211_ff_node_init(ni);
1897 #endif
1898
1899 /*
1900 * Configure state now that we are associated.
1901 *
1902 * XXX may need different/additional driver callbacks?
1903 */
1904 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1905 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1906 vap->iv_flags |= IEEE80211_F_SHPREAMBLE;
1907 vap->iv_flags &= ~IEEE80211_F_USEBARKER;
1908 } else {
1909 vap->iv_flags &= ~IEEE80211_F_SHPREAMBLE;
1910 vap->iv_flags |= IEEE80211_F_USEBARKER;
1911 }
1912 ieee80211_vap_set_shortslottime(vap,
1913 IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1914 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1915 ieee80211_vap_update_preamble(vap);
1916 /*
1917 * Honor ERP protection.
1918 *
1919 * NB: ni_erp should zero for non-11g operation.
1920 */
1921 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1922 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1923 vap->iv_flags |= IEEE80211_F_USEPROT;
1924 else
1925 vap->iv_flags &= ~IEEE80211_F_USEPROT;
1926 ieee80211_vap_update_erp_protmode(vap);
1927 IEEE80211_NOTE_MAC(vap,
1928 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1929 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s%s",
1930 ISREASSOC(subtype) ? "re" : "",
1931 IEEE80211_NODE_AID(ni),
1932 vap->iv_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1933 vap->iv_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1934 vap->iv_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1935 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1936 ni->ni_flags & IEEE80211_NODE_HT ?
1937 (ni->ni_chw == IEEE80211_STA_RX_BW_40 ? ", HT40" : ", HT20") : "",
1938 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1939 ni->ni_flags & IEEE80211_NODE_AMSDU ? " (+AMSDU)" : "",
1940 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1941 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1942 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1943 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1944 ", fast-frames" : "",
1945 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1946 ", turbo" : ""
1947 );
1948 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1949 break;
1950 }
1951
1952 case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1953 uint16_t reason;
1954
1955 if (vap->iv_state == IEEE80211_S_SCAN) {
1956 vap->iv_stats.is_rx_mgtdiscard++;
1957 return;
1958 }
1959 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1960 /* NB: can happen when in promiscuous mode */
1961 vap->iv_stats.is_rx_mgtdiscard++;
1962 break;
1963 }
1964
1965 /*
1966 * deauth frame format
1967 * [2] reason
1968 */
1969 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1970 reason = le16toh(*(uint16_t *)frm);
1971
1972 vap->iv_stats.is_rx_deauth++;
1973 vap->iv_stats.is_rx_deauth_code = reason;
1974 IEEE80211_NODE_STAT(ni, rx_deauth);
1975
1976 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1977 "recv deauthenticate (reason: %d (%s))", reason,
1978 ieee80211_reason_to_string(reason));
1979 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1980 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1981 break;
1982 }
1983
1984 case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1985 uint16_t reason;
1986
1987 if (vap->iv_state != IEEE80211_S_RUN &&
1988 vap->iv_state != IEEE80211_S_ASSOC &&
1989 vap->iv_state != IEEE80211_S_AUTH) {
1990 vap->iv_stats.is_rx_mgtdiscard++;
1991 return;
1992 }
1993 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1994 /* NB: can happen when in promiscuous mode */
1995 vap->iv_stats.is_rx_mgtdiscard++;
1996 break;
1997 }
1998
1999 /*
2000 * disassoc frame format
2001 * [2] reason
2002 */
2003 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2004 reason = le16toh(*(uint16_t *)frm);
2005
2006 vap->iv_stats.is_rx_disassoc++;
2007 vap->iv_stats.is_rx_disassoc_code = reason;
2008 IEEE80211_NODE_STAT(ni, rx_disassoc);
2009
2010 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
2011 "recv disassociate (reason: %d (%s))", reason,
2012 ieee80211_reason_to_string(reason));
2013 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
2014 break;
2015 }
2016
2017 case IEEE80211_FC0_SUBTYPE_ACTION:
2018 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
2019 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
2020 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2021 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2022 wh, NULL, "%s", "not for us");
2023 vap->iv_stats.is_rx_mgtdiscard++;
2024 } else if (vap->iv_state != IEEE80211_S_RUN) {
2025 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2026 wh, NULL, "wrong state %s",
2027 ieee80211_state_name[vap->iv_state]);
2028 vap->iv_stats.is_rx_mgtdiscard++;
2029 } else {
2030 if (ieee80211_parse_action(ni, m0) == 0)
2031 (void)ic->ic_recv_action(ni, wh, frm, efrm);
2032 }
2033 break;
2034
2035 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
2036 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
2037 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
2038 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
2039 case IEEE80211_FC0_SUBTYPE_ATIM:
2040 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2041 wh, NULL, "%s", "not handled");
2042 vap->iv_stats.is_rx_mgtdiscard++;
2043 break;
2044
2045 default:
2046 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2047 wh, "mgt", "subtype 0x%x not handled", subtype);
2048 vap->iv_stats.is_rx_badsubtype++;
2049 break;
2050 }
2051 #undef ISREASSOC
2052 }
2053
2054 static void
sta_recv_ctl(struct ieee80211_node * ni,struct mbuf * m,int subtype)2055 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2056 {
2057 switch (subtype) {
2058 case IEEE80211_FC0_SUBTYPE_BAR:
2059 ieee80211_recv_bar(ni, m);
2060 break;
2061 }
2062 }
2063