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 HOSTAP mode support.
33 */
34 #include "opt_inet.h"
35 #include "opt_wlan.h"
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/mbuf.h>
40 #include <sys/malloc.h>
41 #include <sys/kernel.h>
42
43 #include <sys/socket.h>
44 #include <sys/sockio.h>
45 #include <sys/endian.h>
46 #include <sys/errno.h>
47 #include <sys/proc.h>
48 #include <sys/sysctl.h>
49
50 #include <net/if.h>
51 #include <net/if_var.h>
52 #include <net/if_media.h>
53 #include <net/if_llc.h>
54 #include <net/ethernet.h>
55
56 #include <net/bpf.h>
57
58 #include <netproto/802_11/ieee80211_var.h>
59 #include <netproto/802_11/ieee80211_hostap.h>
60 #include <netproto/802_11/ieee80211_input.h>
61 #ifdef IEEE80211_SUPPORT_SUPERG
62 #include <netproto/802_11/ieee80211_superg.h>
63 #endif
64 #include <netproto/802_11/ieee80211_wds.h>
65
66 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
67
68 static void hostap_vattach(struct ieee80211vap *);
69 static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
70 static int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
71 const struct ieee80211_rx_stats *,
72 int rssi, int nf);
73 static void hostap_deliver_data(struct ieee80211vap *,
74 struct ieee80211_node *, struct mbuf *);
75 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
76 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf);
77 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
78
79 void
ieee80211_hostap_attach(struct ieee80211com * ic)80 ieee80211_hostap_attach(struct ieee80211com *ic)
81 {
82 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
83 }
84
85 void
ieee80211_hostap_detach(struct ieee80211com * ic)86 ieee80211_hostap_detach(struct ieee80211com *ic)
87 {
88 }
89
90 static void
hostap_vdetach(struct ieee80211vap * vap)91 hostap_vdetach(struct ieee80211vap *vap)
92 {
93 }
94
95 static void
hostap_vattach(struct ieee80211vap * vap)96 hostap_vattach(struct ieee80211vap *vap)
97 {
98 vap->iv_newstate = hostap_newstate;
99 vap->iv_input = hostap_input;
100 vap->iv_recv_mgmt = hostap_recv_mgmt;
101 vap->iv_recv_ctl = hostap_recv_ctl;
102 vap->iv_opdetach = hostap_vdetach;
103 vap->iv_deliver_data = hostap_deliver_data;
104 vap->iv_recv_pspoll = ieee80211_recv_pspoll;
105 }
106
107 static void
sta_disassoc(void * arg,struct ieee80211_node * ni)108 sta_disassoc(void *arg, struct ieee80211_node *ni)
109 {
110 struct ieee80211vap *vap = arg;
111
112 if (ni->ni_vap == vap && ni->ni_associd != 0) {
113 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
114 IEEE80211_REASON_ASSOC_LEAVE);
115 ieee80211_node_leave(ni);
116 }
117 }
118
119 static void
sta_csa(void * arg,struct ieee80211_node * ni)120 sta_csa(void *arg, struct ieee80211_node *ni)
121 {
122 struct ieee80211vap *vap = arg;
123
124 if (ni->ni_vap == vap && ni->ni_associd != 0)
125 if (ni->ni_inact > vap->iv_inact_init) {
126 ni->ni_inact = vap->iv_inact_init;
127 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
128 "%s: inact %u", __func__, ni->ni_inact);
129 }
130 }
131
132 static void
sta_drop(void * arg,struct ieee80211_node * ni)133 sta_drop(void *arg, struct ieee80211_node *ni)
134 {
135 struct ieee80211vap *vap = arg;
136
137 if (ni->ni_vap == vap && ni->ni_associd != 0)
138 ieee80211_node_leave(ni);
139 }
140
141 /*
142 * Does a channel change require associated stations to re-associate
143 * so protocol state is correct. This is used when doing CSA across
144 * bands or similar (e.g. HT -> legacy).
145 */
146 static int
isbandchange(struct ieee80211com * ic)147 isbandchange(struct ieee80211com *ic)
148 {
149 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
150 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
151 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
152 }
153
154 /*
155 * IEEE80211_M_HOSTAP vap state machine handler.
156 */
157 static int
hostap_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)158 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
159 {
160 struct ieee80211com *ic = vap->iv_ic;
161 enum ieee80211_state ostate;
162
163 IEEE80211_LOCK_ASSERT(ic);
164
165 ostate = vap->iv_state;
166 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
167 __func__, ieee80211_state_name[ostate],
168 ieee80211_state_name[nstate], arg);
169 vap->iv_state = nstate; /* state transition */
170 if (ostate != IEEE80211_S_SCAN)
171 ieee80211_cancel_scan(vap); /* background scan */
172 switch (nstate) {
173 case IEEE80211_S_INIT:
174 switch (ostate) {
175 case IEEE80211_S_SCAN:
176 ieee80211_cancel_scan(vap);
177 break;
178 case IEEE80211_S_CAC:
179 ieee80211_dfs_cac_stop(vap);
180 break;
181 case IEEE80211_S_RUN:
182 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
183 break;
184 default:
185 break;
186 }
187 if (ostate != IEEE80211_S_INIT) {
188 /* NB: optimize INIT -> INIT case */
189 ieee80211_reset_bss(vap);
190 }
191 if (vap->iv_auth->ia_detach != NULL)
192 vap->iv_auth->ia_detach(vap);
193 break;
194 case IEEE80211_S_SCAN:
195 switch (ostate) {
196 case IEEE80211_S_CSA:
197 case IEEE80211_S_RUN:
198 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
199 /*
200 * Clear overlapping BSS state; the beacon frame
201 * will be reconstructed on transition to the RUN
202 * state and the timeout routines check if the flag
203 * is set before doing anything so this is sufficient.
204 */
205 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
206 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
207 /* fall thru... */
208 case IEEE80211_S_CAC:
209 /*
210 * NB: We may get here because of a manual channel
211 * change in which case we need to stop CAC
212 * XXX no need to stop if ostate RUN but it's ok
213 */
214 ieee80211_dfs_cac_stop(vap);
215 /* fall thru... */
216 case IEEE80211_S_INIT:
217 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
218 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
219 /*
220 * Already have a channel; bypass the
221 * scan and startup immediately.
222 * ieee80211_create_ibss will call back to
223 * move us to RUN state.
224 */
225 ieee80211_create_ibss(vap, vap->iv_des_chan);
226 break;
227 }
228 /*
229 * Initiate a scan. We can come here as a result
230 * of an IEEE80211_IOC_SCAN_REQ too in which case
231 * the vap will be marked with IEEE80211_FEXT_SCANREQ
232 * and the scan request parameters will be present
233 * in iv_scanreq. Otherwise we do the default.
234 */
235 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
236 ieee80211_check_scan(vap,
237 vap->iv_scanreq_flags,
238 vap->iv_scanreq_duration,
239 vap->iv_scanreq_mindwell,
240 vap->iv_scanreq_maxdwell,
241 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
242 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
243 } else
244 ieee80211_check_scan_current(vap);
245 break;
246 case IEEE80211_S_SCAN:
247 /*
248 * A state change requires a reset; scan.
249 */
250 ieee80211_check_scan_current(vap);
251 break;
252 default:
253 break;
254 }
255 break;
256 case IEEE80211_S_CAC:
257 /*
258 * Start CAC on a DFS channel. We come here when starting
259 * a bss on a DFS channel (see ieee80211_create_ibss).
260 */
261 ieee80211_dfs_cac_start(vap);
262 break;
263 case IEEE80211_S_RUN:
264 if (vap->iv_flags & IEEE80211_F_WPA) {
265 /* XXX validate prerequisites */
266 }
267 switch (ostate) {
268 case IEEE80211_S_INIT:
269 /*
270 * Already have a channel; bypass the
271 * scan and startup immediately.
272 * Note that ieee80211_create_ibss will call
273 * back to do a RUN->RUN state change.
274 */
275 ieee80211_create_ibss(vap,
276 ieee80211_ht_adjust_channel(ic,
277 ic->ic_curchan, vap->iv_flags_ht));
278 /* NB: iv_bss is changed on return */
279 break;
280 case IEEE80211_S_CAC:
281 /*
282 * NB: This is the normal state change when CAC
283 * expires and no radar was detected; no need to
284 * clear the CAC timer as it's already expired.
285 */
286 /* fall thru... */
287 case IEEE80211_S_CSA:
288 /*
289 * Shorten inactivity timer of associated stations
290 * to weed out sta's that don't follow a CSA.
291 */
292 ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap);
293 /*
294 * Update bss node channel to reflect where
295 * we landed after CSA.
296 */
297 ieee80211_node_set_chan(vap->iv_bss,
298 ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
299 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
300 /* XXX bypass debug msgs */
301 break;
302 case IEEE80211_S_SCAN:
303 case IEEE80211_S_RUN:
304 #ifdef IEEE80211_DEBUG
305 if (ieee80211_msg_debug(vap)) {
306 struct ieee80211_node *ni = vap->iv_bss;
307 ieee80211_note(vap,
308 "synchronized with %s ssid ",
309 ether_sprintf(ni->ni_bssid));
310 ieee80211_print_essid(ni->ni_essid,
311 ni->ni_esslen);
312 /* XXX MCS/HT */
313 kprintf(" channel %d start %uMb\n",
314 ieee80211_chan2ieee(ic, ic->ic_curchan),
315 IEEE80211_RATE2MBS(ni->ni_txrate));
316 }
317 #endif
318 break;
319 default:
320 break;
321 }
322 /*
323 * Start/stop the authenticator. We delay until here
324 * to allow configuration to happen out of order.
325 */
326 if (vap->iv_auth->ia_attach != NULL) {
327 /* XXX check failure */
328 vap->iv_auth->ia_attach(vap);
329 } else if (vap->iv_auth->ia_detach != NULL) {
330 vap->iv_auth->ia_detach(vap);
331 }
332 ieee80211_node_authorize(vap->iv_bss);
333 break;
334 case IEEE80211_S_CSA:
335 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
336 /*
337 * On a ``band change'' silently drop associated
338 * stations as they must re-associate before they
339 * can pass traffic (as otherwise protocol state
340 * such as capabilities and the negotiated rate
341 * set may/will be wrong).
342 */
343 ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap);
344 }
345 break;
346 default:
347 break;
348 }
349 return 0;
350 }
351
352 static void
hostap_deliver_data(struct ieee80211vap * vap,struct ieee80211_node * ni,struct mbuf * m)353 hostap_deliver_data(struct ieee80211vap *vap,
354 struct ieee80211_node *ni, struct mbuf *m)
355 {
356 struct ether_header *eh = mtod(m, struct ether_header *);
357 struct ifnet *ifp = vap->iv_ifp;
358
359 /* clear driver/net80211 flags before passing up */
360 #if defined(__DragonFly__)
361 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST);
362 #else
363 m->m_flags &= ~(M_MCAST | M_BCAST);
364 m_clrprotoflags(m);
365 #endif
366
367 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
368 ("gack, opmode %d", vap->iv_opmode));
369 /*
370 * Do accounting.
371 */
372 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
373 IEEE80211_NODE_STAT(ni, rx_data);
374 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
375 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
376 m->m_flags |= M_MCAST; /* XXX M_BCAST? */
377 IEEE80211_NODE_STAT(ni, rx_mcast);
378 } else
379 IEEE80211_NODE_STAT(ni, rx_ucast);
380
381 /* perform as a bridge within the AP */
382 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
383 struct mbuf *mcopy = NULL;
384
385 if (m->m_flags & M_MCAST) {
386 mcopy = m_dup(m, M_NOWAIT);
387 if (mcopy == NULL)
388 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
389 else
390 mcopy->m_flags |= M_MCAST;
391 } else {
392 /*
393 * Check if the destination is associated with the
394 * same vap and authorized to receive traffic.
395 * Beware of traffic destined for the vap itself;
396 * sending it will not work; just let it be delivered
397 * normally.
398 */
399 struct ieee80211_node *sta = ieee80211_find_vap_node(
400 &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
401 if (sta != NULL) {
402 if (ieee80211_node_is_authorized(sta)) {
403 /*
404 * Beware of sending to ourself; this
405 * needs to happen via the normal
406 * input path.
407 */
408 if (sta != vap->iv_bss) {
409 mcopy = m;
410 m = NULL;
411 }
412 } else {
413 vap->iv_stats.is_rx_unauth++;
414 IEEE80211_NODE_STAT(sta, rx_unauth);
415 }
416 ieee80211_free_node(sta);
417 }
418 }
419 if (mcopy != NULL) {
420 int len, err;
421 len = mcopy->m_pkthdr.len;
422 err = ieee80211_vap_xmitpkt(vap, mcopy);
423 if (err) {
424 /* NB: IFQ_HANDOFF reclaims mcopy */
425 } else {
426 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
427 }
428 }
429 }
430 if (m != NULL) {
431 /*
432 * Mark frame as coming from vap's interface.
433 */
434 m->m_pkthdr.rcvif = ifp;
435 if (m->m_flags & M_MCAST) {
436 /*
437 * Spam DWDS vap's w/ multicast traffic.
438 */
439 /* XXX only if dwds in use? */
440 ieee80211_dwds_mcast(vap, m);
441 }
442 if (ni->ni_vlan != 0) {
443 /* attach vlan tag */
444 #if defined(__DragonFly__)
445 /* XXX ntohs() needed? */
446 m->m_pkthdr.ether_vlantag = ni->ni_vlan;
447 #else
448 m->m_pkthdr.ether_vtag = ni->ni_vlan;
449 #endif
450 m->m_flags |= M_VLANTAG;
451 }
452 #if defined(__DragonFly__)
453 ifp->if_input(ifp, m, NULL, -1);
454 #else
455 ifp->if_input(ifp, m);
456 #endif
457 }
458 }
459
460 /*
461 * Decide if a received management frame should be
462 * printed when debugging is enabled. This filters some
463 * of the less interesting frames that come frequently
464 * (e.g. beacons).
465 */
466 static __inline int
doprint(struct ieee80211vap * vap,int subtype)467 doprint(struct ieee80211vap *vap, int subtype)
468 {
469 switch (subtype) {
470 case IEEE80211_FC0_SUBTYPE_BEACON:
471 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
472 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
473 return 0;
474 }
475 return 1;
476 }
477
478 /*
479 * Process a received frame. The node associated with the sender
480 * should be supplied. If nothing was found in the node table then
481 * the caller is assumed to supply a reference to iv_bss instead.
482 * The RSSI and a timestamp are also supplied. The RSSI data is used
483 * during AP scanning to select a AP to associate with; it can have
484 * any units so long as values have consistent units and higher values
485 * mean ``better signal''. The receive timestamp is currently not used
486 * by the 802.11 layer.
487 */
488 static int
hostap_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)489 hostap_input(struct ieee80211_node *ni, struct mbuf *m,
490 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
491 {
492 struct ieee80211vap *vap = ni->ni_vap;
493 struct ieee80211com *ic = ni->ni_ic;
494 struct ifnet *ifp = vap->iv_ifp;
495 struct ieee80211_frame *wh;
496 struct ieee80211_key *key;
497 struct ether_header *eh;
498 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
499 uint8_t dir, type, subtype, qos;
500 uint8_t *bssid;
501
502 if (m->m_flags & M_AMPDU_MPDU) {
503 /*
504 * Fastpath for A-MPDU reorder q resubmission. Frames
505 * w/ M_AMPDU_MPDU marked have already passed through
506 * here but were received out of order and been held on
507 * the reorder queue. When resubmitted they are marked
508 * with the M_AMPDU_MPDU flag and we can bypass most of
509 * the normal processing.
510 */
511 wh = mtod(m, struct ieee80211_frame *);
512 type = IEEE80211_FC0_TYPE_DATA;
513 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
514 subtype = IEEE80211_FC0_SUBTYPE_QOS;
515 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
516 goto resubmit_ampdu;
517 }
518
519 KASSERT(ni != NULL, ("null node"));
520 ni->ni_inact = ni->ni_inact_reload;
521
522 type = -1; /* undefined */
523
524 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
525 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
526 ni->ni_macaddr, NULL,
527 "too short (1): len %u", m->m_pkthdr.len);
528 vap->iv_stats.is_rx_tooshort++;
529 goto out;
530 }
531 /*
532 * Bit of a cheat here, we use a pointer for a 3-address
533 * frame format but don't reference fields past outside
534 * ieee80211_frame_min w/o first validating the data is
535 * present.
536 */
537 wh = mtod(m, struct ieee80211_frame *);
538
539 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
540 IEEE80211_FC0_VERSION_0) {
541 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
542 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
543 wh->i_fc[0], wh->i_fc[1]);
544 vap->iv_stats.is_rx_badversion++;
545 goto err;
546 }
547
548 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
549 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
550 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
551 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
552 if (dir != IEEE80211_FC1_DIR_NODS)
553 bssid = wh->i_addr1;
554 else if (type == IEEE80211_FC0_TYPE_CTL)
555 bssid = wh->i_addr1;
556 else {
557 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
558 IEEE80211_DISCARD_MAC(vap,
559 IEEE80211_MSG_ANY, ni->ni_macaddr,
560 NULL, "too short (2): len %u",
561 m->m_pkthdr.len);
562 vap->iv_stats.is_rx_tooshort++;
563 goto out;
564 }
565 bssid = wh->i_addr3;
566 }
567 /*
568 * Validate the bssid.
569 */
570 if (!(type == IEEE80211_FC0_TYPE_MGT &&
571 subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
572 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
573 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
574 /* not interested in */
575 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
576 bssid, NULL, "%s", "not to bss");
577 vap->iv_stats.is_rx_wrongbss++;
578 goto out;
579 }
580
581 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
582 ni->ni_noise = nf;
583 if (IEEE80211_HAS_SEQ(type, subtype)) {
584 uint8_t tid = ieee80211_gettid(wh);
585 if (IEEE80211_QOS_HAS_SEQ(wh) &&
586 TID_TO_WME_AC(tid) >= WME_AC_VI)
587 ic->ic_wme.wme_hipri_traffic++;
588 if (! ieee80211_check_rxseq(ni, wh, bssid))
589 goto out;
590 }
591 }
592
593 switch (type) {
594 case IEEE80211_FC0_TYPE_DATA:
595 hdrspace = ieee80211_hdrspace(ic, wh);
596 if (m->m_len < hdrspace &&
597 (m = m_pullup(m, hdrspace)) == NULL) {
598 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
599 ni->ni_macaddr, NULL,
600 "data too short: expecting %u", hdrspace);
601 vap->iv_stats.is_rx_tooshort++;
602 goto out; /* XXX */
603 }
604 if (!(dir == IEEE80211_FC1_DIR_TODS ||
605 (dir == IEEE80211_FC1_DIR_DSTODS &&
606 (vap->iv_flags & IEEE80211_F_DWDS)))) {
607 if (dir != IEEE80211_FC1_DIR_DSTODS) {
608 IEEE80211_DISCARD(vap,
609 IEEE80211_MSG_INPUT, wh, "data",
610 "incorrect dir 0x%x", dir);
611 } else {
612 IEEE80211_DISCARD(vap,
613 IEEE80211_MSG_INPUT |
614 IEEE80211_MSG_WDS, wh,
615 "4-address data",
616 "%s", "DWDS not enabled");
617 }
618 vap->iv_stats.is_rx_wrongdir++;
619 goto out;
620 }
621 /* check if source STA is associated */
622 if (ni == vap->iv_bss) {
623 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
624 wh, "data", "%s", "unknown src");
625 ieee80211_send_error(ni, wh->i_addr2,
626 IEEE80211_FC0_SUBTYPE_DEAUTH,
627 IEEE80211_REASON_NOT_AUTHED);
628 vap->iv_stats.is_rx_notassoc++;
629 goto err;
630 }
631 if (ni->ni_associd == 0) {
632 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
633 wh, "data", "%s", "unassoc src");
634 IEEE80211_SEND_MGMT(ni,
635 IEEE80211_FC0_SUBTYPE_DISASSOC,
636 IEEE80211_REASON_NOT_ASSOCED);
637 vap->iv_stats.is_rx_notassoc++;
638 goto err;
639 }
640
641 /*
642 * Check for power save state change.
643 * XXX out-of-order A-MPDU frames?
644 */
645 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
646 (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
647 vap->iv_node_ps(ni,
648 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
649 /*
650 * For 4-address packets handle WDS discovery
651 * notifications. Once a WDS link is setup frames
652 * are just delivered to the WDS vap (see below).
653 */
654 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
655 if (!ieee80211_node_is_authorized(ni)) {
656 IEEE80211_DISCARD(vap,
657 IEEE80211_MSG_INPUT |
658 IEEE80211_MSG_WDS, wh,
659 "4-address data",
660 "%s", "unauthorized port");
661 vap->iv_stats.is_rx_unauth++;
662 IEEE80211_NODE_STAT(ni, rx_unauth);
663 goto err;
664 }
665 ieee80211_dwds_discover(ni, m);
666 return type;
667 }
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 ieee80211_ampdu_reorder(ni, m) != 0) {
677 m = NULL;
678 goto out;
679 }
680 resubmit_ampdu:
681
682 /*
683 * Handle privacy requirements. Note that we
684 * must not be preempted from here until after
685 * we (potentially) call ieee80211_crypto_demic;
686 * otherwise we may violate assumptions in the
687 * crypto cipher modules used to do delayed update
688 * of replay sequence numbers.
689 */
690 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
691 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
692 /*
693 * Discard encrypted frames when privacy is off.
694 */
695 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
696 wh, "WEP", "%s", "PRIVACY off");
697 vap->iv_stats.is_rx_noprivacy++;
698 IEEE80211_NODE_STAT(ni, rx_noprivacy);
699 goto out;
700 }
701 key = ieee80211_crypto_decap(ni, m, hdrspace);
702 if (key == NULL) {
703 /* NB: stats+msgs handled in crypto_decap */
704 IEEE80211_NODE_STAT(ni, rx_wepfail);
705 goto out;
706 }
707 wh = mtod(m, struct ieee80211_frame *);
708 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
709 } else {
710 /* XXX M_WEP and IEEE80211_F_PRIVACY */
711 key = NULL;
712 }
713
714 /*
715 * Save QoS bits for use below--before we strip the header.
716 */
717 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
718 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
719 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
720 ((struct ieee80211_qosframe *)wh)->i_qos[0];
721 } else
722 qos = 0;
723
724 /*
725 * Next up, any fragmentation.
726 */
727 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
728 m = ieee80211_defrag(ni, m, hdrspace);
729 if (m == NULL) {
730 /* Fragment dropped or frame not complete yet */
731 goto out;
732 }
733 }
734 wh = NULL; /* no longer valid, catch any uses */
735
736 /*
737 * Next strip any MSDU crypto bits.
738 */
739 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
740 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
741 ni->ni_macaddr, "data", "%s", "demic error");
742 vap->iv_stats.is_rx_demicfail++;
743 IEEE80211_NODE_STAT(ni, rx_demicfail);
744 goto out;
745 }
746 /* copy to listener after decrypt */
747 if (ieee80211_radiotap_active_vap(vap))
748 ieee80211_radiotap_rx(vap, m);
749 need_tap = 0;
750 /*
751 * Finally, strip the 802.11 header.
752 */
753 m = ieee80211_decap(vap, m, hdrspace);
754 if (m == NULL) {
755 /* XXX mask bit to check for both */
756 /* don't count Null data frames as errors */
757 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
758 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
759 goto out;
760 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
761 ni->ni_macaddr, "data", "%s", "decap error");
762 vap->iv_stats.is_rx_decap++;
763 IEEE80211_NODE_STAT(ni, rx_decap);
764 goto err;
765 }
766 eh = mtod(m, struct ether_header *);
767 if (!ieee80211_node_is_authorized(ni)) {
768 /*
769 * Deny any non-PAE frames received prior to
770 * authorization. For open/shared-key
771 * authentication the port is mark authorized
772 * after authentication completes. For 802.1x
773 * the port is not marked authorized by the
774 * authenticator until the handshake has completed.
775 */
776 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
777 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
778 eh->ether_shost, "data",
779 "unauthorized port: ether type 0x%x len %u",
780 eh->ether_type, m->m_pkthdr.len);
781 vap->iv_stats.is_rx_unauth++;
782 IEEE80211_NODE_STAT(ni, rx_unauth);
783 goto err;
784 }
785 } else {
786 /*
787 * When denying unencrypted frames, discard
788 * any non-PAE frames received without encryption.
789 */
790 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
791 (key == NULL && (m->m_flags & M_WEP) == 0) &&
792 eh->ether_type != htons(ETHERTYPE_PAE)) {
793 /*
794 * Drop unencrypted frames.
795 */
796 vap->iv_stats.is_rx_unencrypted++;
797 IEEE80211_NODE_STAT(ni, rx_unencrypted);
798 goto out;
799 }
800 }
801 /* XXX require HT? */
802 if (qos & IEEE80211_QOS_AMSDU) {
803 m = ieee80211_decap_amsdu(ni, m);
804 if (m == NULL)
805 return IEEE80211_FC0_TYPE_DATA;
806 } else {
807 #ifdef IEEE80211_SUPPORT_SUPERG
808 m = ieee80211_decap_fastframe(vap, ni, m);
809 if (m == NULL)
810 return IEEE80211_FC0_TYPE_DATA;
811 #endif
812 }
813 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
814 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
815 else
816 hostap_deliver_data(vap, ni, m);
817 return IEEE80211_FC0_TYPE_DATA;
818
819 case IEEE80211_FC0_TYPE_MGT:
820 vap->iv_stats.is_rx_mgmt++;
821 IEEE80211_NODE_STAT(ni, rx_mgmt);
822 if (dir != IEEE80211_FC1_DIR_NODS) {
823 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
824 wh, "mgt", "incorrect dir 0x%x", dir);
825 vap->iv_stats.is_rx_wrongdir++;
826 goto err;
827 }
828 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
829 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
830 ni->ni_macaddr, "mgt", "too short: len %u",
831 m->m_pkthdr.len);
832 vap->iv_stats.is_rx_tooshort++;
833 goto out;
834 }
835 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
836 /* ensure return frames are unicast */
837 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
838 wh, NULL, "source is multicast: %s",
839 ether_sprintf(wh->i_addr2));
840 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
841 goto out;
842 }
843 #ifdef IEEE80211_DEBUG
844 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
845 ieee80211_msg_dumppkts(vap)) {
846 if_printf(ifp, "received %s from %s rssi %d\n",
847 ieee80211_mgt_subtype_name(subtype),
848 ether_sprintf(wh->i_addr2), rssi);
849 }
850 #endif
851 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
852 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
853 /*
854 * Only shared key auth frames with a challenge
855 * should be encrypted, discard all others.
856 */
857 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
858 wh, NULL,
859 "%s", "WEP set but not permitted");
860 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
861 goto out;
862 }
863 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
864 /*
865 * Discard encrypted frames when privacy is off.
866 */
867 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
868 wh, NULL, "%s", "WEP set but PRIVACY off");
869 vap->iv_stats.is_rx_noprivacy++;
870 goto out;
871 }
872 hdrspace = ieee80211_hdrspace(ic, wh);
873 key = ieee80211_crypto_decap(ni, m, hdrspace);
874 if (key == NULL) {
875 /* NB: stats+msgs handled in crypto_decap */
876 goto out;
877 }
878 wh = mtod(m, struct ieee80211_frame *);
879 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
880 }
881 /*
882 * Pass the packet to radiotap before calling iv_recv_mgmt().
883 * Otherwise iv_recv_mgmt() might pass another packet to
884 * radiotap, resulting in out of order packet captures.
885 */
886 if (ieee80211_radiotap_active_vap(vap))
887 ieee80211_radiotap_rx(vap, m);
888 need_tap = 0;
889 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
890 goto out;
891
892 case IEEE80211_FC0_TYPE_CTL:
893 vap->iv_stats.is_rx_ctl++;
894 IEEE80211_NODE_STAT(ni, rx_ctrl);
895 vap->iv_recv_ctl(ni, m, subtype);
896 goto out;
897 default:
898 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
899 wh, "bad", "frame type 0x%x", type);
900 /* should not come here */
901 break;
902 }
903 err:
904 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
905 out:
906 if (m != NULL) {
907 if (need_tap && ieee80211_radiotap_active_vap(vap))
908 ieee80211_radiotap_rx(vap, m);
909 m_freem(m);
910 }
911 return type;
912 }
913
914 static void
hostap_auth_open(struct ieee80211_node * ni,struct ieee80211_frame * wh,int rssi,int nf,uint16_t seq,uint16_t status)915 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
916 int rssi, int nf, uint16_t seq, uint16_t status)
917 {
918 struct ieee80211vap *vap = ni->ni_vap;
919
920 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
921
922 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
923 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
924 ni->ni_macaddr, "open auth",
925 "bad sta auth mode %u", ni->ni_authmode);
926 vap->iv_stats.is_rx_bad_auth++; /* XXX */
927 /*
928 * Clear any challenge text that may be there if
929 * a previous shared key auth failed and then an
930 * open auth is attempted.
931 */
932 if (ni->ni_challenge != NULL) {
933 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
934 ni->ni_challenge = NULL;
935 }
936 /* XXX hack to workaround calling convention */
937 ieee80211_send_error(ni, wh->i_addr2,
938 IEEE80211_FC0_SUBTYPE_AUTH,
939 (seq + 1) | (IEEE80211_STATUS_ALG<<16));
940 return;
941 }
942 if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
943 vap->iv_stats.is_rx_bad_auth++;
944 return;
945 }
946 /* always accept open authentication requests */
947 if (ni == vap->iv_bss) {
948 ni = ieee80211_dup_bss(vap, wh->i_addr2);
949 if (ni == NULL)
950 return;
951 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
952 (void) ieee80211_ref_node(ni);
953 /*
954 * Mark the node as referenced to reflect that it's
955 * reference count has been bumped to insure it remains
956 * after the transaction completes.
957 */
958 ni->ni_flags |= IEEE80211_NODE_AREF;
959 /*
960 * Mark the node as requiring a valid association id
961 * before outbound traffic is permitted.
962 */
963 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
964
965 if (vap->iv_acl != NULL &&
966 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
967 /*
968 * When the ACL policy is set to RADIUS we defer the
969 * authorization to a user agent. Dispatch an event,
970 * a subsequent MLME call will decide the fate of the
971 * station. If the user agent is not present then the
972 * node will be reclaimed due to inactivity.
973 */
974 IEEE80211_NOTE_MAC(vap,
975 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
976 "%s", "station authentication defered (radius acl)");
977 ieee80211_notify_node_auth(ni);
978 } else {
979 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
980 IEEE80211_NOTE_MAC(vap,
981 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
982 "%s", "station authenticated (open)");
983 /*
984 * When 802.1x is not in use mark the port
985 * authorized at this point so traffic can flow.
986 */
987 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
988 ieee80211_node_authorize(ni);
989 }
990 }
991
992 static void
hostap_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)993 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
994 uint8_t *frm, uint8_t *efrm, int rssi, int nf,
995 uint16_t seq, uint16_t status)
996 {
997 struct ieee80211vap *vap = ni->ni_vap;
998 uint8_t *challenge;
999 int allocbs, estatus;
1000
1001 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
1002
1003 /*
1004 * NB: this can happen as we allow pre-shared key
1005 * authentication to be enabled w/o wep being turned
1006 * on so that configuration of these can be done
1007 * in any order. It may be better to enforce the
1008 * ordering in which case this check would just be
1009 * for sanity/consistency.
1010 */
1011 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1012 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1013 ni->ni_macaddr, "shared key auth",
1014 "%s", " PRIVACY is disabled");
1015 estatus = IEEE80211_STATUS_ALG;
1016 goto bad;
1017 }
1018 /*
1019 * Pre-shared key authentication is evil; accept
1020 * it only if explicitly configured (it is supported
1021 * mainly for compatibility with clients like Mac OS X).
1022 */
1023 if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1024 ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1025 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1026 ni->ni_macaddr, "shared key auth",
1027 "bad sta auth mode %u", ni->ni_authmode);
1028 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1029 estatus = IEEE80211_STATUS_ALG;
1030 goto bad;
1031 }
1032
1033 challenge = NULL;
1034 if (frm + 1 < efrm) {
1035 if ((frm[1] + 2) > (efrm - frm)) {
1036 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1037 ni->ni_macaddr, "shared key auth",
1038 "ie %d/%ld too long",
1039 frm[0], (frm[1] + 2) - (efrm - frm));
1040 vap->iv_stats.is_rx_bad_auth++;
1041 estatus = IEEE80211_STATUS_CHALLENGE;
1042 goto bad;
1043 }
1044 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1045 challenge = frm;
1046 frm += frm[1] + 2;
1047 }
1048 switch (seq) {
1049 case IEEE80211_AUTH_SHARED_CHALLENGE:
1050 case IEEE80211_AUTH_SHARED_RESPONSE:
1051 if (challenge == NULL) {
1052 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1053 ni->ni_macaddr, "shared key auth",
1054 "%s", "no challenge");
1055 vap->iv_stats.is_rx_bad_auth++;
1056 estatus = IEEE80211_STATUS_CHALLENGE;
1057 goto bad;
1058 }
1059 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1060 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1061 ni->ni_macaddr, "shared key auth",
1062 "bad challenge len %d", challenge[1]);
1063 vap->iv_stats.is_rx_bad_auth++;
1064 estatus = IEEE80211_STATUS_CHALLENGE;
1065 goto bad;
1066 }
1067 default:
1068 break;
1069 }
1070 switch (seq) {
1071 case IEEE80211_AUTH_SHARED_REQUEST:
1072 if (ni == vap->iv_bss) {
1073 ni = ieee80211_dup_bss(vap, wh->i_addr2);
1074 if (ni == NULL) {
1075 /* NB: no way to return an error */
1076 return;
1077 }
1078 allocbs = 1;
1079 } else {
1080 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1081 (void) ieee80211_ref_node(ni);
1082 allocbs = 0;
1083 }
1084 /*
1085 * Mark the node as referenced to reflect that it's
1086 * reference count has been bumped to insure it remains
1087 * after the transaction completes.
1088 */
1089 ni->ni_flags |= IEEE80211_NODE_AREF;
1090 /*
1091 * Mark the node as requiring a valid associatio id
1092 * before outbound traffic is permitted.
1093 */
1094 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1095 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1096 ni->ni_noise = nf;
1097 if (!ieee80211_alloc_challenge(ni)) {
1098 /* NB: don't return error so they rexmit */
1099 return;
1100 }
1101 get_random_bytes(ni->ni_challenge,
1102 IEEE80211_CHALLENGE_LEN);
1103 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1104 ni, "shared key %sauth request", allocbs ? "" : "re");
1105 /*
1106 * When the ACL policy is set to RADIUS we defer the
1107 * authorization to a user agent. Dispatch an event,
1108 * a subsequent MLME call will decide the fate of the
1109 * station. If the user agent is not present then the
1110 * node will be reclaimed due to inactivity.
1111 */
1112 if (vap->iv_acl != NULL &&
1113 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1114 IEEE80211_NOTE_MAC(vap,
1115 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1116 ni->ni_macaddr,
1117 "%s", "station authentication defered (radius acl)");
1118 ieee80211_notify_node_auth(ni);
1119 return;
1120 }
1121 break;
1122 case IEEE80211_AUTH_SHARED_RESPONSE:
1123 if (ni == vap->iv_bss) {
1124 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1125 ni->ni_macaddr, "shared key response",
1126 "%s", "unknown station");
1127 /* NB: don't send a response */
1128 return;
1129 }
1130 if (ni->ni_challenge == NULL) {
1131 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1132 ni->ni_macaddr, "shared key response",
1133 "%s", "no challenge recorded");
1134 vap->iv_stats.is_rx_bad_auth++;
1135 estatus = IEEE80211_STATUS_CHALLENGE;
1136 goto bad;
1137 }
1138 if (memcmp(ni->ni_challenge, &challenge[2],
1139 challenge[1]) != 0) {
1140 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1141 ni->ni_macaddr, "shared key response",
1142 "%s", "challenge mismatch");
1143 vap->iv_stats.is_rx_auth_fail++;
1144 estatus = IEEE80211_STATUS_CHALLENGE;
1145 goto bad;
1146 }
1147 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1148 ni, "%s", "station authenticated (shared key)");
1149 ieee80211_node_authorize(ni);
1150 break;
1151 default:
1152 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1153 ni->ni_macaddr, "shared key auth",
1154 "bad seq %d", seq);
1155 vap->iv_stats.is_rx_bad_auth++;
1156 estatus = IEEE80211_STATUS_SEQUENCE;
1157 goto bad;
1158 }
1159 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1160 return;
1161 bad:
1162 /*
1163 * Send an error response; but only when operating as an AP.
1164 */
1165 /* XXX hack to workaround calling convention */
1166 ieee80211_send_error(ni, wh->i_addr2,
1167 IEEE80211_FC0_SUBTYPE_AUTH,
1168 (seq + 1) | (estatus<<16));
1169 }
1170
1171 /*
1172 * Convert a WPA cipher selector OUI to an internal
1173 * cipher algorithm. Where appropriate we also
1174 * record any key length.
1175 */
1176 static int
wpa_cipher(const uint8_t * sel,uint8_t * keylen)1177 wpa_cipher(const uint8_t *sel, uint8_t *keylen)
1178 {
1179 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1180 uint32_t w = le32dec(sel);
1181
1182 switch (w) {
1183 case WPA_SEL(WPA_CSE_NULL):
1184 return IEEE80211_CIPHER_NONE;
1185 case WPA_SEL(WPA_CSE_WEP40):
1186 if (keylen)
1187 *keylen = 40 / NBBY;
1188 return IEEE80211_CIPHER_WEP;
1189 case WPA_SEL(WPA_CSE_WEP104):
1190 if (keylen)
1191 *keylen = 104 / NBBY;
1192 return IEEE80211_CIPHER_WEP;
1193 case WPA_SEL(WPA_CSE_TKIP):
1194 return IEEE80211_CIPHER_TKIP;
1195 case WPA_SEL(WPA_CSE_CCMP):
1196 return IEEE80211_CIPHER_AES_CCM;
1197 }
1198 return 32; /* NB: so 1<< is discarded */
1199 #undef WPA_SEL
1200 }
1201
1202 /*
1203 * Convert a WPA key management/authentication algorithm
1204 * to an internal code.
1205 */
1206 static int
wpa_keymgmt(const uint8_t * sel)1207 wpa_keymgmt(const uint8_t *sel)
1208 {
1209 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1210 uint32_t w = le32dec(sel);
1211
1212 switch (w) {
1213 case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1214 return WPA_ASE_8021X_UNSPEC;
1215 case WPA_SEL(WPA_ASE_8021X_PSK):
1216 return WPA_ASE_8021X_PSK;
1217 case WPA_SEL(WPA_ASE_NONE):
1218 return WPA_ASE_NONE;
1219 }
1220 return 0; /* NB: so is discarded */
1221 #undef WPA_SEL
1222 }
1223
1224 /*
1225 * Parse a WPA information element to collect parameters.
1226 * Note that we do not validate security parameters; that
1227 * is handled by the authenticator; the parsing done here
1228 * is just for internal use in making operational decisions.
1229 */
1230 static int
ieee80211_parse_wpa(struct ieee80211vap * vap,const uint8_t * frm,struct ieee80211_rsnparms * rsn,const struct ieee80211_frame * wh)1231 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1232 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1233 {
1234 uint8_t len = frm[1];
1235 uint32_t w;
1236 int n;
1237
1238 /*
1239 * Check the length once for fixed parts: OUI, type,
1240 * version, mcast cipher, and 2 selector counts.
1241 * Other, variable-length data, must be checked separately.
1242 */
1243 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1244 IEEE80211_DISCARD_IE(vap,
1245 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1246 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1247 return IEEE80211_REASON_IE_INVALID;
1248 }
1249 if (len < 14) {
1250 IEEE80211_DISCARD_IE(vap,
1251 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1252 wh, "WPA", "too short, len %u", len);
1253 return IEEE80211_REASON_IE_INVALID;
1254 }
1255 frm += 6, len -= 4; /* NB: len is payload only */
1256 /* NB: iswpaoui already validated the OUI and type */
1257 w = le16dec(frm);
1258 if (w != WPA_VERSION) {
1259 IEEE80211_DISCARD_IE(vap,
1260 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1261 wh, "WPA", "bad version %u", w);
1262 return IEEE80211_REASON_IE_INVALID;
1263 }
1264 frm += 2, len -= 2;
1265
1266 memset(rsn, 0, sizeof(*rsn));
1267
1268 /* multicast/group cipher */
1269 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
1270 frm += 4, len -= 4;
1271
1272 /* unicast ciphers */
1273 n = le16dec(frm);
1274 frm += 2, len -= 2;
1275 if (len < n*4+2) {
1276 IEEE80211_DISCARD_IE(vap,
1277 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1278 wh, "WPA", "ucast cipher data too short; len %u, n %u",
1279 len, n);
1280 return IEEE80211_REASON_IE_INVALID;
1281 }
1282 w = 0;
1283 for (; n > 0; n--) {
1284 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
1285 frm += 4, len -= 4;
1286 }
1287 if (w & (1<<IEEE80211_CIPHER_TKIP))
1288 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1289 else
1290 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1291
1292 /* key management algorithms */
1293 n = le16dec(frm);
1294 frm += 2, len -= 2;
1295 if (len < n*4) {
1296 IEEE80211_DISCARD_IE(vap,
1297 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1298 wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1299 len, n);
1300 return IEEE80211_REASON_IE_INVALID;
1301 }
1302 w = 0;
1303 for (; n > 0; n--) {
1304 w |= wpa_keymgmt(frm);
1305 frm += 4, len -= 4;
1306 }
1307 if (w & WPA_ASE_8021X_UNSPEC)
1308 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1309 else
1310 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1311
1312 if (len > 2) /* optional capabilities */
1313 rsn->rsn_caps = le16dec(frm);
1314
1315 return 0;
1316 }
1317
1318 /*
1319 * Convert an RSN cipher selector OUI to an internal
1320 * cipher algorithm. Where appropriate we also
1321 * record any key length.
1322 */
1323 static int
rsn_cipher(const uint8_t * sel,uint8_t * keylen)1324 rsn_cipher(const uint8_t *sel, uint8_t *keylen)
1325 {
1326 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1327 uint32_t w = le32dec(sel);
1328
1329 switch (w) {
1330 case RSN_SEL(RSN_CSE_NULL):
1331 return IEEE80211_CIPHER_NONE;
1332 case RSN_SEL(RSN_CSE_WEP40):
1333 if (keylen)
1334 *keylen = 40 / NBBY;
1335 return IEEE80211_CIPHER_WEP;
1336 case RSN_SEL(RSN_CSE_WEP104):
1337 if (keylen)
1338 *keylen = 104 / NBBY;
1339 return IEEE80211_CIPHER_WEP;
1340 case RSN_SEL(RSN_CSE_TKIP):
1341 return IEEE80211_CIPHER_TKIP;
1342 case RSN_SEL(RSN_CSE_CCMP):
1343 return IEEE80211_CIPHER_AES_CCM;
1344 case RSN_SEL(RSN_CSE_WRAP):
1345 return IEEE80211_CIPHER_AES_OCB;
1346 }
1347 return 32; /* NB: so 1<< is discarded */
1348 #undef WPA_SEL
1349 }
1350
1351 /*
1352 * Convert an RSN key management/authentication algorithm
1353 * to an internal code.
1354 */
1355 static int
rsn_keymgmt(const uint8_t * sel)1356 rsn_keymgmt(const uint8_t *sel)
1357 {
1358 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1359 uint32_t w = le32dec(sel);
1360
1361 switch (w) {
1362 case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1363 return RSN_ASE_8021X_UNSPEC;
1364 case RSN_SEL(RSN_ASE_8021X_PSK):
1365 return RSN_ASE_8021X_PSK;
1366 case RSN_SEL(RSN_ASE_NONE):
1367 return RSN_ASE_NONE;
1368 }
1369 return 0; /* NB: so is discarded */
1370 #undef RSN_SEL
1371 }
1372
1373 /*
1374 * Parse a WPA/RSN information element to collect parameters
1375 * and validate the parameters against what has been
1376 * configured for the system.
1377 */
1378 static int
ieee80211_parse_rsn(struct ieee80211vap * vap,const uint8_t * frm,struct ieee80211_rsnparms * rsn,const struct ieee80211_frame * wh)1379 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1380 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1381 {
1382 uint8_t len = frm[1];
1383 uint32_t w;
1384 int n;
1385
1386 /*
1387 * Check the length once for fixed parts:
1388 * version, mcast cipher, and 2 selector counts.
1389 * Other, variable-length data, must be checked separately.
1390 */
1391 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1392 IEEE80211_DISCARD_IE(vap,
1393 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1394 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1395 return IEEE80211_REASON_IE_INVALID;
1396 }
1397 if (len < 10) {
1398 IEEE80211_DISCARD_IE(vap,
1399 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1400 wh, "RSN", "too short, len %u", len);
1401 return IEEE80211_REASON_IE_INVALID;
1402 }
1403 frm += 2;
1404 w = le16dec(frm);
1405 if (w != RSN_VERSION) {
1406 IEEE80211_DISCARD_IE(vap,
1407 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1408 wh, "RSN", "bad version %u", w);
1409 return IEEE80211_REASON_IE_INVALID;
1410 }
1411 frm += 2, len -= 2;
1412
1413 memset(rsn, 0, sizeof(*rsn));
1414
1415 /* multicast/group cipher */
1416 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
1417 frm += 4, len -= 4;
1418
1419 /* unicast ciphers */
1420 n = le16dec(frm);
1421 frm += 2, len -= 2;
1422 if (len < n*4+2) {
1423 IEEE80211_DISCARD_IE(vap,
1424 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1425 wh, "RSN", "ucast cipher data too short; len %u, n %u",
1426 len, n);
1427 return IEEE80211_REASON_IE_INVALID;
1428 }
1429 w = 0;
1430 for (; n > 0; n--) {
1431 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
1432 frm += 4, len -= 4;
1433 }
1434 if (w & (1<<IEEE80211_CIPHER_TKIP))
1435 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1436 else
1437 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1438
1439 /* key management algorithms */
1440 n = le16dec(frm);
1441 frm += 2, len -= 2;
1442 if (len < n*4) {
1443 IEEE80211_DISCARD_IE(vap,
1444 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1445 wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1446 len, n);
1447 return IEEE80211_REASON_IE_INVALID;
1448 }
1449 w = 0;
1450 for (; n > 0; n--) {
1451 w |= rsn_keymgmt(frm);
1452 frm += 4, len -= 4;
1453 }
1454 if (w & RSN_ASE_8021X_UNSPEC)
1455 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1456 else
1457 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1458
1459 /* optional RSN capabilities */
1460 if (len > 2)
1461 rsn->rsn_caps = le16dec(frm);
1462 /* XXXPMKID */
1463
1464 return 0;
1465 }
1466
1467 /*
1468 * WPA/802.11i association request processing.
1469 */
1470 static int
wpa_assocreq(struct ieee80211_node * ni,struct ieee80211_rsnparms * rsnparms,const struct ieee80211_frame * wh,const uint8_t * wpa,const uint8_t * rsn,uint16_t capinfo)1471 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1472 const struct ieee80211_frame *wh, const uint8_t *wpa,
1473 const uint8_t *rsn, uint16_t capinfo)
1474 {
1475 struct ieee80211vap *vap = ni->ni_vap;
1476 uint8_t reason;
1477 int badwparsn;
1478
1479 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1480 if (wpa == NULL && rsn == NULL) {
1481 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1482 /*
1483 * W-Fi Protected Setup (WPS) permits
1484 * clients to associate and pass EAPOL frames
1485 * to establish initial credentials.
1486 */
1487 ni->ni_flags |= IEEE80211_NODE_WPS;
1488 return 1;
1489 }
1490 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1491 (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1492 /*
1493 * Transitional Security Network. Permits clients
1494 * to associate and use WEP while WPA is configured.
1495 */
1496 ni->ni_flags |= IEEE80211_NODE_TSN;
1497 return 1;
1498 }
1499 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1500 wh, NULL, "%s", "no WPA/RSN IE in association request");
1501 vap->iv_stats.is_rx_assoc_badwpaie++;
1502 reason = IEEE80211_REASON_IE_INVALID;
1503 goto bad;
1504 }
1505 /* assert right association security credentials */
1506 badwparsn = 0; /* NB: to silence compiler */
1507 switch (vap->iv_flags & IEEE80211_F_WPA) {
1508 case IEEE80211_F_WPA1:
1509 badwparsn = (wpa == NULL);
1510 break;
1511 case IEEE80211_F_WPA2:
1512 badwparsn = (rsn == NULL);
1513 break;
1514 case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1515 badwparsn = (wpa == NULL && rsn == NULL);
1516 break;
1517 }
1518 if (badwparsn) {
1519 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1520 wh, NULL,
1521 "%s", "missing WPA/RSN IE in association request");
1522 vap->iv_stats.is_rx_assoc_badwpaie++;
1523 reason = IEEE80211_REASON_IE_INVALID;
1524 goto bad;
1525 }
1526 /*
1527 * Parse WPA/RSN information element.
1528 */
1529 if (wpa != NULL)
1530 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1531 else
1532 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1533 if (reason != 0) {
1534 /* XXX distinguish WPA/RSN? */
1535 vap->iv_stats.is_rx_assoc_badwpaie++;
1536 goto bad;
1537 }
1538 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1539 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1540 wpa != NULL ? "WPA" : "RSN",
1541 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1542 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1543 rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1544
1545 return 1;
1546 bad:
1547 ieee80211_node_deauth(ni, reason);
1548 return 0;
1549 }
1550
1551 /* XXX find a better place for definition */
1552 struct l2_update_frame {
1553 struct ether_header eh;
1554 uint8_t dsap;
1555 uint8_t ssap;
1556 uint8_t control;
1557 uint8_t xid[3];
1558 } __packed;
1559
1560 /*
1561 * Deliver a TGf L2UF frame on behalf of a station.
1562 * This primes any bridge when the station is roaming
1563 * between ap's on the same wired network.
1564 */
1565 static void
ieee80211_deliver_l2uf(struct ieee80211_node * ni)1566 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1567 {
1568 struct ieee80211vap *vap = ni->ni_vap;
1569 struct ifnet *ifp = vap->iv_ifp;
1570 struct mbuf *m;
1571 struct l2_update_frame *l2uf;
1572 struct ether_header *eh;
1573
1574 m = m_gethdr(M_NOWAIT, MT_DATA);
1575 if (m == NULL) {
1576 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1577 "%s", "no mbuf for l2uf frame");
1578 vap->iv_stats.is_rx_nobuf++; /* XXX not right */
1579 return;
1580 }
1581 l2uf = mtod(m, struct l2_update_frame *);
1582 eh = &l2uf->eh;
1583 /* dst: Broadcast address */
1584 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1585 /* src: associated STA */
1586 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1587 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1588
1589 l2uf->dsap = 0;
1590 l2uf->ssap = 0;
1591 l2uf->control = 0xf5;
1592 l2uf->xid[0] = 0x81;
1593 l2uf->xid[1] = 0x80;
1594 l2uf->xid[2] = 0x00;
1595
1596 m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1597 hostap_deliver_data(vap, ni, m);
1598 }
1599
1600 static void
ratesetmismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp,const char * tag,int rate)1601 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1602 int reassoc, int resp, const char *tag, int rate)
1603 {
1604 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1605 "deny %s request, %s rate set mismatch, rate/MCS %d",
1606 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1607 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1608 ieee80211_node_leave(ni);
1609 }
1610
1611 static void
capinfomismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp,const char * tag,int capinfo)1612 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1613 int reassoc, int resp, const char *tag, int capinfo)
1614 {
1615 struct ieee80211vap *vap = ni->ni_vap;
1616
1617 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1618 "deny %s request, %s mismatch 0x%x",
1619 reassoc ? "reassoc" : "assoc", tag, capinfo);
1620 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1621 ieee80211_node_leave(ni);
1622 vap->iv_stats.is_rx_assoc_capmismatch++;
1623 }
1624
1625 static void
htcapmismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp)1626 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1627 int reassoc, int resp)
1628 {
1629 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1630 "deny %s request, missing HT ie", reassoc ? "reassoc" : "assoc");
1631 /* XXX no better code */
1632 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1633 ieee80211_node_leave(ni);
1634 }
1635
1636 static void
authalgreject(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int algo,int seq,int status)1637 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1638 int algo, int seq, int status)
1639 {
1640 struct ieee80211vap *vap = ni->ni_vap;
1641
1642 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1643 wh, NULL, "unsupported alg %d", algo);
1644 vap->iv_stats.is_rx_auth_unsupported++;
1645 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1646 seq | (status << 16));
1647 }
1648
1649 static __inline int
ishtmixed(const uint8_t * ie)1650 ishtmixed(const uint8_t *ie)
1651 {
1652 const struct ieee80211_ie_htinfo *ht =
1653 (const struct ieee80211_ie_htinfo *) ie;
1654 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1655 IEEE80211_HTINFO_OPMODE_MIXED;
1656 }
1657
1658 static int
is11bclient(const uint8_t * rates,const uint8_t * xrates)1659 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1660 {
1661 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1662 int i;
1663
1664 /* NB: the 11b clients we care about will not have xrates */
1665 if (xrates != NULL || rates == NULL)
1666 return 0;
1667 for (i = 0; i < rates[1]; i++) {
1668 int r = rates[2+i] & IEEE80211_RATE_VAL;
1669 if (r > 2*11 || ((1<<r) & brates) == 0)
1670 return 0;
1671 }
1672 return 1;
1673 }
1674
1675 static void
hostap_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)1676 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1677 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
1678 {
1679 struct ieee80211vap *vap = ni->ni_vap;
1680 struct ieee80211com *ic = ni->ni_ic;
1681 struct ieee80211_frame *wh;
1682 uint8_t *frm, *efrm, *sfrm;
1683 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1684 int reassoc, resp;
1685 uint8_t rate;
1686
1687 wh = mtod(m0, struct ieee80211_frame *);
1688 frm = (uint8_t *)&wh[1];
1689 efrm = mtod(m0, uint8_t *) + m0->m_len;
1690 switch (subtype) {
1691 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1692 /*
1693 * We process beacon/probe response frames when scanning;
1694 * otherwise we check beacon frames for overlapping non-ERP
1695 * BSS in 11g and/or overlapping legacy BSS when in HT.
1696 */
1697 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
1698 vap->iv_stats.is_rx_mgtdiscard++;
1699 return;
1700 }
1701 /* FALLTHROUGH */
1702 case IEEE80211_FC0_SUBTYPE_BEACON: {
1703 struct ieee80211_scanparams scan;
1704
1705 /* NB: accept off-channel frames */
1706 /* XXX TODO: use rxstatus to determine off-channel details */
1707 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1708 return;
1709 /*
1710 * Count frame now that we know it's to be processed.
1711 */
1712 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1713 vap->iv_stats.is_rx_beacon++; /* XXX remove */
1714 IEEE80211_NODE_STAT(ni, rx_beacons);
1715 } else
1716 IEEE80211_NODE_STAT(ni, rx_proberesp);
1717 /*
1718 * If scanning, just pass information to the scan module.
1719 */
1720 if (ic->ic_flags & IEEE80211_F_SCAN) {
1721 if (scan.status == 0 && /* NB: on channel */
1722 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1723 /*
1724 * Actively scanning a channel marked passive;
1725 * send a probe request now that we know there
1726 * is 802.11 traffic present.
1727 *
1728 * XXX check if the beacon we recv'd gives
1729 * us what we need and suppress the probe req
1730 */
1731 ieee80211_probe_curchan(vap, 1);
1732 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1733 }
1734 ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh,
1735 subtype, rssi, nf);
1736 return;
1737 }
1738 /*
1739 * Check beacon for overlapping bss w/ non ERP stations.
1740 * If we detect one and protection is configured but not
1741 * enabled, enable it and start a timer that'll bring us
1742 * out if we stop seeing the bss.
1743 */
1744 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1745 scan.status == 0 && /* NB: on-channel */
1746 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/
1747 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1748 ic->ic_lastnonerp = ticks;
1749 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1750 if (ic->ic_protmode != IEEE80211_PROT_NONE &&
1751 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
1752 IEEE80211_NOTE_FRAME(vap,
1753 IEEE80211_MSG_ASSOC, wh,
1754 "non-ERP present on channel %d "
1755 "(saw erp 0x%x from channel %d), "
1756 "enable use of protection",
1757 ic->ic_curchan->ic_ieee,
1758 scan.erp, scan.chan);
1759 ic->ic_flags |= IEEE80211_F_USEPROT;
1760 ieee80211_notify_erp(ic);
1761 }
1762 }
1763 /*
1764 * Check beacon for non-HT station on HT channel
1765 * and update HT BSS occupancy as appropriate.
1766 */
1767 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1768 if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1769 /*
1770 * Off control channel; only check frames
1771 * that come in the extension channel when
1772 * operating w/ HT40.
1773 */
1774 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1775 break;
1776 if (scan.chan != ic->ic_curchan->ic_extieee)
1777 break;
1778 }
1779 if (scan.htinfo == NULL) {
1780 ieee80211_htprot_update(ic,
1781 IEEE80211_HTINFO_OPMODE_PROTOPT |
1782 IEEE80211_HTINFO_NONHT_PRESENT);
1783 } else if (ishtmixed(scan.htinfo)) {
1784 /* XXX? take NONHT_PRESENT from beacon? */
1785 ieee80211_htprot_update(ic,
1786 IEEE80211_HTINFO_OPMODE_MIXED |
1787 IEEE80211_HTINFO_NONHT_PRESENT);
1788 }
1789 }
1790 break;
1791 }
1792
1793 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1794 if (vap->iv_state != IEEE80211_S_RUN) {
1795 vap->iv_stats.is_rx_mgtdiscard++;
1796 return;
1797 }
1798 /*
1799 * Consult the ACL policy module if setup.
1800 */
1801 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1802 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1803 wh, NULL, "%s", "disallowed by ACL");
1804 vap->iv_stats.is_rx_acl++;
1805 return;
1806 }
1807 /*
1808 * prreq frame format
1809 * [tlv] ssid
1810 * [tlv] supported rates
1811 * [tlv] extended supported rates
1812 */
1813 ssid = rates = xrates = NULL;
1814 sfrm = frm;
1815 while (efrm - frm > 1) {
1816 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1817 switch (*frm) {
1818 case IEEE80211_ELEMID_SSID:
1819 ssid = frm;
1820 break;
1821 case IEEE80211_ELEMID_RATES:
1822 rates = frm;
1823 break;
1824 case IEEE80211_ELEMID_XRATES:
1825 xrates = frm;
1826 break;
1827 }
1828 frm += frm[1] + 2;
1829 }
1830 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1831 if (xrates != NULL)
1832 IEEE80211_VERIFY_ELEMENT(xrates,
1833 IEEE80211_RATE_MAXSIZE - rates[1], return);
1834 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1835 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1836 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1837 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1838 wh, NULL,
1839 "%s", "no ssid with ssid suppression enabled");
1840 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1841 return;
1842 }
1843
1844 /* XXX find a better class or define it's own */
1845 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1846 "%s", "recv probe req");
1847 /*
1848 * Some legacy 11b clients cannot hack a complete
1849 * probe response frame. When the request includes
1850 * only a bare-bones rate set, communicate this to
1851 * the transmit side.
1852 */
1853 ieee80211_send_proberesp(vap, wh->i_addr2,
1854 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1855 break;
1856
1857 case IEEE80211_FC0_SUBTYPE_AUTH: {
1858 uint16_t algo, seq, status;
1859
1860 if (vap->iv_state != IEEE80211_S_RUN) {
1861 vap->iv_stats.is_rx_mgtdiscard++;
1862 return;
1863 }
1864 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1865 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1866 wh, NULL, "%s", "wrong bssid");
1867 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1868 return;
1869 }
1870 /*
1871 * auth frame format
1872 * [2] algorithm
1873 * [2] sequence
1874 * [2] status
1875 * [tlv*] challenge
1876 */
1877 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1878 algo = le16toh(*(uint16_t *)frm);
1879 seq = le16toh(*(uint16_t *)(frm + 2));
1880 status = le16toh(*(uint16_t *)(frm + 4));
1881 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1882 "recv auth frame with algorithm %d seq %d", algo, seq);
1883 /*
1884 * Consult the ACL policy module if setup.
1885 */
1886 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1887 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1888 wh, NULL, "%s", "disallowed by ACL");
1889 vap->iv_stats.is_rx_acl++;
1890 ieee80211_send_error(ni, wh->i_addr2,
1891 IEEE80211_FC0_SUBTYPE_AUTH,
1892 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1893 return;
1894 }
1895 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1896 IEEE80211_DISCARD(vap,
1897 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1898 wh, NULL, "%s", "TKIP countermeasures enabled");
1899 vap->iv_stats.is_rx_auth_countermeasures++;
1900 ieee80211_send_error(ni, wh->i_addr2,
1901 IEEE80211_FC0_SUBTYPE_AUTH,
1902 IEEE80211_REASON_MIC_FAILURE);
1903 return;
1904 }
1905 if (algo == IEEE80211_AUTH_ALG_SHARED)
1906 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1907 seq, status);
1908 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1909 hostap_auth_open(ni, wh, rssi, nf, seq, status);
1910 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1911 authalgreject(ni, wh, algo,
1912 seq+1, IEEE80211_STATUS_ALG);
1913 return;
1914 } else {
1915 /*
1916 * We assume that an unknown algorithm is the result
1917 * of a decryption failure on a shared key auth frame;
1918 * return a status code appropriate for that instead
1919 * of IEEE80211_STATUS_ALG.
1920 *
1921 * NB: a seq# of 4 is intentional; the decrypted
1922 * frame likely has a bogus seq value.
1923 */
1924 authalgreject(ni, wh, algo,
1925 4, IEEE80211_STATUS_CHALLENGE);
1926 return;
1927 }
1928 break;
1929 }
1930
1931 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1932 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
1933 uint16_t capinfo, lintval;
1934 struct ieee80211_rsnparms rsnparms;
1935
1936 if (vap->iv_state != IEEE80211_S_RUN) {
1937 vap->iv_stats.is_rx_mgtdiscard++;
1938 return;
1939 }
1940 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1941 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1942 wh, NULL, "%s", "wrong bssid");
1943 vap->iv_stats.is_rx_assoc_bss++;
1944 return;
1945 }
1946 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1947 reassoc = 1;
1948 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
1949 } else {
1950 reassoc = 0;
1951 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
1952 }
1953 if (ni == vap->iv_bss) {
1954 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1955 "deny %s request, sta not authenticated",
1956 reassoc ? "reassoc" : "assoc");
1957 ieee80211_send_error(ni, wh->i_addr2,
1958 IEEE80211_FC0_SUBTYPE_DEAUTH,
1959 IEEE80211_REASON_ASSOC_NOT_AUTHED);
1960 vap->iv_stats.is_rx_assoc_notauth++;
1961 return;
1962 }
1963
1964 /*
1965 * asreq frame format
1966 * [2] capability information
1967 * [2] listen interval
1968 * [6*] current AP address (reassoc only)
1969 * [tlv] ssid
1970 * [tlv] supported rates
1971 * [tlv] extended supported rates
1972 * [tlv] WPA or RSN
1973 * [tlv] HT capabilities
1974 * [tlv] Atheros capabilities
1975 */
1976 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
1977 capinfo = le16toh(*(uint16_t *)frm); frm += 2;
1978 lintval = le16toh(*(uint16_t *)frm); frm += 2;
1979 if (reassoc)
1980 frm += 6; /* ignore current AP info */
1981 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
1982 sfrm = frm;
1983 while (efrm - frm > 1) {
1984 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1985 switch (*frm) {
1986 case IEEE80211_ELEMID_SSID:
1987 ssid = frm;
1988 break;
1989 case IEEE80211_ELEMID_RATES:
1990 rates = frm;
1991 break;
1992 case IEEE80211_ELEMID_XRATES:
1993 xrates = frm;
1994 break;
1995 case IEEE80211_ELEMID_RSN:
1996 rsn = frm;
1997 break;
1998 case IEEE80211_ELEMID_HTCAP:
1999 htcap = frm;
2000 break;
2001 case IEEE80211_ELEMID_VENDOR:
2002 if (iswpaoui(frm))
2003 wpa = frm;
2004 else if (iswmeinfo(frm))
2005 wme = frm;
2006 #ifdef IEEE80211_SUPPORT_SUPERG
2007 else if (isatherosoui(frm))
2008 ath = frm;
2009 #endif
2010 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2011 if (ishtcapoui(frm) && htcap == NULL)
2012 htcap = frm;
2013 }
2014 break;
2015 }
2016 frm += frm[1] + 2;
2017 }
2018 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2019 if (xrates != NULL)
2020 IEEE80211_VERIFY_ELEMENT(xrates,
2021 IEEE80211_RATE_MAXSIZE - rates[1], return);
2022 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2023 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2024 if (htcap != NULL) {
2025 IEEE80211_VERIFY_LENGTH(htcap[1],
2026 htcap[0] == IEEE80211_ELEMID_VENDOR ?
2027 4 + sizeof(struct ieee80211_ie_htcap)-2 :
2028 sizeof(struct ieee80211_ie_htcap)-2,
2029 return); /* XXX just NULL out? */
2030 }
2031
2032 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2033 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2034 return;
2035 /* discard challenge after association */
2036 if (ni->ni_challenge != NULL) {
2037 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
2038 ni->ni_challenge = NULL;
2039 }
2040 /* NB: 802.11 spec says to ignore station's privacy bit */
2041 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2042 capinfomismatch(ni, wh, reassoc, resp,
2043 "capability", capinfo);
2044 return;
2045 }
2046 /*
2047 * Disallow re-associate w/ invalid slot time setting.
2048 */
2049 if (ni->ni_associd != 0 &&
2050 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2051 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2052 capinfomismatch(ni, wh, reassoc, resp,
2053 "slot time", capinfo);
2054 return;
2055 }
2056 rate = ieee80211_setup_rates(ni, rates, xrates,
2057 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2058 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2059 if (rate & IEEE80211_RATE_BASIC) {
2060 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2061 vap->iv_stats.is_rx_assoc_norate++;
2062 return;
2063 }
2064 /*
2065 * If constrained to 11g-only stations reject an
2066 * 11b-only station. We cheat a bit here by looking
2067 * at the max negotiated xmit rate and assuming anyone
2068 * with a best rate <24Mb/s is an 11b station.
2069 */
2070 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2071 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2072 vap->iv_stats.is_rx_assoc_norate++;
2073 return;
2074 }
2075 /*
2076 * Do HT rate set handling and setup HT node state.
2077 */
2078 ni->ni_chan = vap->iv_bss->ni_chan;
2079 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2080 rate = ieee80211_setup_htrates(ni, htcap,
2081 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2082 IEEE80211_F_DOBRS);
2083 if (rate & IEEE80211_RATE_BASIC) {
2084 ratesetmismatch(ni, wh, reassoc, resp,
2085 "HT", rate);
2086 vap->iv_stats.is_ht_assoc_norate++;
2087 return;
2088 }
2089 ieee80211_ht_node_init(ni);
2090 ieee80211_ht_updatehtcap(ni, htcap);
2091 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2092 ieee80211_ht_node_cleanup(ni);
2093 #ifdef IEEE80211_SUPPORT_SUPERG
2094 /* Always do ff node cleanup; for A-MSDU */
2095 ieee80211_ff_node_cleanup(ni);
2096 #endif
2097 /*
2098 * Allow AMPDU operation only with unencrypted traffic
2099 * or AES-CCM; the 11n spec only specifies these ciphers
2100 * so permitting any others is undefined and can lead
2101 * to interoperability problems.
2102 */
2103 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2104 (((vap->iv_flags & IEEE80211_F_WPA) &&
2105 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2106 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2107 IEEE80211_NOTE(vap,
2108 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2109 "disallow HT use because WEP or TKIP requested, "
2110 "capinfo 0x%x ucastcipher %d", capinfo,
2111 rsnparms.rsn_ucastcipher);
2112 ieee80211_ht_node_cleanup(ni);
2113 #ifdef IEEE80211_SUPPORT_SUPERG
2114 /* Always do ff node cleanup; for A-MSDU */
2115 ieee80211_ff_node_cleanup(ni);
2116 #endif
2117 vap->iv_stats.is_ht_assoc_downgrade++;
2118 }
2119 /*
2120 * If constrained to 11n-only stations reject legacy stations.
2121 */
2122 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2123 (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2124 htcapmismatch(ni, wh, reassoc, resp);
2125 vap->iv_stats.is_ht_assoc_nohtcap++;
2126 return;
2127 }
2128 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2129 ni->ni_noise = nf;
2130 ni->ni_intval = lintval;
2131 ni->ni_capinfo = capinfo;
2132 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2133 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2134 /*
2135 * Store the IEs.
2136 * XXX maybe better to just expand
2137 */
2138 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2139 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2140 if (wpa != NULL)
2141 setie(wpa_ie, wpa - sfrm);
2142 if (rsn != NULL)
2143 setie(rsn_ie, rsn - sfrm);
2144 if (htcap != NULL)
2145 setie(htcap_ie, htcap - sfrm);
2146 if (wme != NULL) {
2147 setie(wme_ie, wme - sfrm);
2148 /*
2149 * Mark node as capable of QoS.
2150 */
2151 ni->ni_flags |= IEEE80211_NODE_QOS;
2152 } else
2153 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2154 #ifdef IEEE80211_SUPPORT_SUPERG
2155 if (ath != NULL) {
2156 setie(ath_ie, ath - sfrm);
2157 /*
2158 * Parse ATH station parameters.
2159 */
2160 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2161 } else
2162 #endif
2163 ni->ni_ath_flags = 0;
2164 #undef setie
2165 } else {
2166 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2167 ni->ni_ath_flags = 0;
2168 }
2169 ieee80211_node_join(ni, resp);
2170 ieee80211_deliver_l2uf(ni);
2171 break;
2172 }
2173
2174 case IEEE80211_FC0_SUBTYPE_DEAUTH:
2175 case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2176 uint16_t reason;
2177
2178 if (vap->iv_state != IEEE80211_S_RUN ||
2179 /* NB: can happen when in promiscuous mode */
2180 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2181 vap->iv_stats.is_rx_mgtdiscard++;
2182 break;
2183 }
2184 /*
2185 * deauth/disassoc frame format
2186 * [2] reason
2187 */
2188 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2189 reason = le16toh(*(uint16_t *)frm);
2190 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2191 vap->iv_stats.is_rx_deauth++;
2192 IEEE80211_NODE_STAT(ni, rx_deauth);
2193 } else {
2194 vap->iv_stats.is_rx_disassoc++;
2195 IEEE80211_NODE_STAT(ni, rx_disassoc);
2196 }
2197 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2198 "recv %s (reason: %d (%s))",
2199 ieee80211_mgt_subtype_name(subtype),
2200 reason, ieee80211_reason_to_string(reason));
2201 if (ni != vap->iv_bss)
2202 ieee80211_node_leave(ni);
2203 break;
2204 }
2205
2206 case IEEE80211_FC0_SUBTYPE_ACTION:
2207 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
2208 if (ni == vap->iv_bss) {
2209 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2210 wh, NULL, "%s", "unknown node");
2211 vap->iv_stats.is_rx_mgtdiscard++;
2212 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
2213 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2214 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2215 wh, NULL, "%s", "not for us");
2216 vap->iv_stats.is_rx_mgtdiscard++;
2217 } else if (vap->iv_state != IEEE80211_S_RUN) {
2218 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2219 wh, NULL, "wrong state %s",
2220 ieee80211_state_name[vap->iv_state]);
2221 vap->iv_stats.is_rx_mgtdiscard++;
2222 } else {
2223 if (ieee80211_parse_action(ni, m0) == 0)
2224 (void)ic->ic_recv_action(ni, wh, frm, efrm);
2225 }
2226 break;
2227
2228 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2229 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2230 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
2231 case IEEE80211_FC0_SUBTYPE_ATIM:
2232 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2233 wh, NULL, "%s", "not handled");
2234 vap->iv_stats.is_rx_mgtdiscard++;
2235 break;
2236
2237 default:
2238 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2239 wh, "mgt", "subtype 0x%x not handled", subtype);
2240 vap->iv_stats.is_rx_badsubtype++;
2241 break;
2242 }
2243 }
2244
2245 static void
hostap_recv_ctl(struct ieee80211_node * ni,struct mbuf * m,int subtype)2246 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2247 {
2248 switch (subtype) {
2249 case IEEE80211_FC0_SUBTYPE_PS_POLL:
2250 ni->ni_vap->iv_recv_pspoll(ni, m);
2251 break;
2252 case IEEE80211_FC0_SUBTYPE_BAR:
2253 ieee80211_recv_bar(ni, m);
2254 break;
2255 }
2256 }
2257
2258 /*
2259 * Process a received ps-poll frame.
2260 */
2261 void
ieee80211_recv_pspoll(struct ieee80211_node * ni,struct mbuf * m0)2262 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2263 {
2264 struct ieee80211vap *vap = ni->ni_vap;
2265 struct ieee80211com *ic = vap->iv_ic;
2266 struct ieee80211_frame_min *wh;
2267 struct mbuf *m;
2268 uint16_t aid;
2269 int qlen;
2270
2271 wh = mtod(m0, struct ieee80211_frame_min *);
2272 if (ni->ni_associd == 0) {
2273 IEEE80211_DISCARD(vap,
2274 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2275 (struct ieee80211_frame *) wh, NULL,
2276 "%s", "unassociated station");
2277 vap->iv_stats.is_ps_unassoc++;
2278 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2279 IEEE80211_REASON_NOT_ASSOCED);
2280 return;
2281 }
2282
2283 aid = le16toh(*(uint16_t *)wh->i_dur);
2284 if (aid != ni->ni_associd) {
2285 IEEE80211_DISCARD(vap,
2286 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2287 (struct ieee80211_frame *) wh, NULL,
2288 "aid mismatch: sta aid 0x%x poll aid 0x%x",
2289 ni->ni_associd, aid);
2290 vap->iv_stats.is_ps_badaid++;
2291 /*
2292 * NB: We used to deauth the station but it turns out
2293 * the Blackberry Curve 8230 (and perhaps other devices)
2294 * sometimes send the wrong AID when WME is negotiated.
2295 * Being more lenient here seems ok as we already check
2296 * the station is associated and we only return frames
2297 * queued for the station (i.e. we don't use the AID).
2298 */
2299 return;
2300 }
2301
2302 /* Okay, take the first queued packet and put it out... */
2303 m = ieee80211_node_psq_dequeue(ni, &qlen);
2304 if (m == NULL) {
2305 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2306 "%s", "recv ps-poll, but queue empty");
2307 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2308 vap->iv_stats.is_ps_qempty++; /* XXX node stat */
2309 if (vap->iv_set_tim != NULL)
2310 vap->iv_set_tim(ni, 0); /* just in case */
2311 return;
2312 }
2313 /*
2314 * If there are more packets, set the more packets bit
2315 * in the packet dispatched to the station; otherwise
2316 * turn off the TIM bit.
2317 */
2318 if (qlen != 0) {
2319 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2320 "recv ps-poll, send packet, %u still queued", qlen);
2321 m->m_flags |= M_MORE_DATA;
2322 } else {
2323 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2324 "%s", "recv ps-poll, send packet, queue empty");
2325 if (vap->iv_set_tim != NULL)
2326 vap->iv_set_tim(ni, 0);
2327 }
2328 m->m_flags |= M_PWR_SAV; /* bypass PS handling */
2329
2330 /*
2331 * Do the right thing; if it's an encap'ed frame then
2332 * call ieee80211_parent_xmitpkt() else
2333 * call ieee80211_vap_xmitpkt().
2334 */
2335 if (m->m_flags & M_ENCAP) {
2336 (void) ieee80211_parent_xmitpkt(ic, m);
2337 } else {
2338 (void) ieee80211_vap_xmitpkt(vap, m);
2339 }
2340 }
2341