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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_media.h>
52 #include <net/if_llc.h>
53 #include <net/ethernet.h>
54
55 #include <net/bpf.h>
56
57 #include <net80211/ieee80211_var.h>
58 #include <net80211/ieee80211_hostap.h>
59 #include <net80211/ieee80211_input.h>
60 #ifdef IEEE80211_SUPPORT_SUPERG
61 #include <net80211/ieee80211_superg.h>
62 #endif
63 #include <net80211/ieee80211_wds.h>
64
65 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
66
67 static  void hostap_vattach(struct ieee80211vap *);
68 static  int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
69 static  int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
70             int rssi, int nf);
71 static void hostap_deliver_data(struct ieee80211vap *,
72             struct ieee80211_node *, struct mbuf *);
73 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
74             int subtype, int rssi, int nf);
75 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
76 static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *);
77
78 void
79 ieee80211_hostap_attach(struct ieee80211com *ic)
80 {
81         ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
82 }
83
84 void
85 ieee80211_hostap_detach(struct ieee80211com *ic)
86 {
87 }
88
89 static void
90 hostap_vdetach(struct ieee80211vap *vap)
91 {
92 }
93
94 static void
95 hostap_vattach(struct ieee80211vap *vap)
96 {
97         vap->iv_newstate = hostap_newstate;
98         vap->iv_input = hostap_input;
99         vap->iv_recv_mgmt = hostap_recv_mgmt;
100         vap->iv_recv_ctl = hostap_recv_ctl;
101         vap->iv_opdetach = hostap_vdetach;
102         vap->iv_deliver_data = hostap_deliver_data;
103 }
104
105 static void
106 sta_disassoc(void *arg, struct ieee80211_node *ni)
107 {
108         struct ieee80211vap *vap = arg;
109
110         if (ni->ni_vap == vap && ni->ni_associd != 0) {
111                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
112                         IEEE80211_REASON_ASSOC_LEAVE);
113                 ieee80211_node_leave(ni);
114         }
115 }
116
117 static void
118 sta_csa(void *arg, struct ieee80211_node *ni)
119 {
120         struct ieee80211vap *vap = arg;
121
122         if (ni->ni_vap == vap && ni->ni_associd != 0)
123                 if (ni->ni_inact > vap->iv_inact_init) {
124                         ni->ni_inact = vap->iv_inact_init;
125                         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
126                             "%s: inact %u", __func__, ni->ni_inact);
127                 }
128 }
129
130 static void
131 sta_drop(void *arg, struct ieee80211_node *ni)
132 {
133         struct ieee80211vap *vap = arg;
134
135         if (ni->ni_vap == vap && ni->ni_associd != 0)
136                 ieee80211_node_leave(ni);
137 }
138
139 /*
140  * Does a channel change require associated stations to re-associate
141  * so protocol state is correct.  This is used when doing CSA across
142  * bands or similar (e.g. HT -> legacy).
143  */
144 static int
145 isbandchange(struct ieee80211com *ic)
146 {
147         return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
148             (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
149              IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
150 }
151
152 /*
153  * IEEE80211_M_HOSTAP vap state machine handler.
154  */
155 static int
156 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
157 {
158         struct ieee80211com *ic = vap->iv_ic;
159         enum ieee80211_state ostate;
160
161         IEEE80211_LOCK_ASSERT(ic);
162
163         ostate = vap->iv_state;
164         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
165             __func__, ieee80211_state_name[ostate],
166             ieee80211_state_name[nstate], arg);
167         vap->iv_state = nstate;                 /* state transition */
168         if (ostate != IEEE80211_S_SCAN)
169                 ieee80211_cancel_scan(vap);     /* background scan */
170         switch (nstate) {
171         case IEEE80211_S_INIT:
172                 switch (ostate) {
173                 case IEEE80211_S_SCAN:
174                         ieee80211_cancel_scan(vap);
175                         break;
176                 case IEEE80211_S_CAC:
177                         ieee80211_dfs_cac_stop(vap);
178                         break;
179                 case IEEE80211_S_RUN:
180                         ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
181                         break;
182                 default:
183                         break;
184                 }
185                 if (ostate != IEEE80211_S_INIT) {
186                         /* NB: optimize INIT -> INIT case */
187                         ieee80211_reset_bss(vap);
188                 }
189                 if (vap->iv_auth->ia_detach != NULL)
190                         vap->iv_auth->ia_detach(vap);
191                 break;
192         case IEEE80211_S_SCAN:
193                 switch (ostate) {
194                 case IEEE80211_S_CSA:
195                 case IEEE80211_S_RUN:
196                         ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
197                         /*
198                          * Clear overlapping BSS state; the beacon frame
199                          * will be reconstructed on transition to the RUN
200                          * state and the timeout routines check if the flag
201                          * is set before doing anything so this is sufficient.
202                          */
203                         ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
204                         ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
205                         /* fall thru... */
206                 case IEEE80211_S_CAC:
207                         /*
208                          * NB: We may get here because of a manual channel
209                          *     change in which case we need to stop CAC
210                          * XXX no need to stop if ostate RUN but it's ok
211                          */
212                         ieee80211_dfs_cac_stop(vap);
213                         /* fall thru... */
214                 case IEEE80211_S_INIT:
215                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
216                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
217                                 /*
218                                  * Already have a channel; bypass the
219                                  * scan and startup immediately.  
220                                  * ieee80211_create_ibss will call back to
221                                  * move us to RUN state.
222                                  */
223                                 ieee80211_create_ibss(vap, vap->iv_des_chan);
224                                 break;
225                         }
226                         /*
227                          * Initiate a scan.  We can come here as a result
228                          * of an IEEE80211_IOC_SCAN_REQ too in which case
229                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
230                          * and the scan request parameters will be present
231                          * in iv_scanreq.  Otherwise we do the default.
232                          */
233                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
234                                 ieee80211_check_scan(vap,
235                                     vap->iv_scanreq_flags,
236                                     vap->iv_scanreq_duration,
237                                     vap->iv_scanreq_mindwell,
238                                     vap->iv_scanreq_maxdwell,
239                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
240                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
241                         } else
242                                 ieee80211_check_scan_current(vap);
243                         break;
244                 case IEEE80211_S_SCAN:
245                         /*
246                          * A state change requires a reset; scan.
247                          */
248                         ieee80211_check_scan_current(vap);
249                         break;
250                 default:
251                         break;
252                 }
253                 break;
254         case IEEE80211_S_CAC:
255                 /*
256                  * Start CAC on a DFS channel.  We come here when starting
257                  * a bss on a DFS channel (see ieee80211_create_ibss).
258                  */
259                 ieee80211_dfs_cac_start(vap);
260                 break;
261         case IEEE80211_S_RUN:
262                 if (vap->iv_flags & IEEE80211_F_WPA) {
263                         /* XXX validate prerequisites */
264                 }
265                 switch (ostate) {
266                 case IEEE80211_S_INIT:
267                         /*
268                          * Already have a channel; bypass the
269                          * scan and startup immediately.
270                          * Note that ieee80211_create_ibss will call
271                          * back to do a RUN->RUN state change.
272                          */
273                         ieee80211_create_ibss(vap,
274                             ieee80211_ht_adjust_channel(ic,
275                                 ic->ic_curchan, vap->iv_flags_ht));
276                         /* NB: iv_bss is changed on return */
277                         break;
278                 case IEEE80211_S_CAC:
279                         /*
280                          * NB: This is the normal state change when CAC
281                          * expires and no radar was detected; no need to
282                          * clear the CAC timer as it's already expired.
283                          */
284                         /* fall thru... */
285                 case IEEE80211_S_CSA:
286                         /*
287                          * Shorten inactivity timer of associated stations
288                          * to weed out sta's that don't follow a CSA.
289                          */
290                         ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap);
291                         /*
292                          * Update bss node channel to reflect where
293                          * we landed after CSA.
294                          */
295                         ieee80211_node_set_chan(vap->iv_bss,
296                             ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
297                                 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
298                         /* XXX bypass debug msgs */
299                         break;
300                 case IEEE80211_S_SCAN:
301                 case IEEE80211_S_RUN:
302 #ifdef IEEE80211_DEBUG
303                         if (ieee80211_msg_debug(vap)) {
304                                 struct ieee80211_node *ni = vap->iv_bss;
305                                 ieee80211_note(vap,
306                                     "synchronized with %s ssid ",
307                                     ether_sprintf(ni->ni_bssid));
308                                 ieee80211_print_essid(ni->ni_essid,
309                                     ni->ni_esslen);
310                                 /* XXX MCS/HT */
311                                 printf(" channel %d start %uMb\n",
312                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
313                                     IEEE80211_RATE2MBS(ni->ni_txrate));
314                         }
315 #endif
316                         break;
317                 default:
318                         break;
319                 }
320                 /*
321                  * Start/stop the authenticator.  We delay until here
322                  * to allow configuration to happen out of order.
323                  */
324                 if (vap->iv_auth->ia_attach != NULL) {
325                         /* XXX check failure */
326                         vap->iv_auth->ia_attach(vap);
327                 } else if (vap->iv_auth->ia_detach != NULL) {
328                         vap->iv_auth->ia_detach(vap);
329                 }
330                 ieee80211_node_authorize(vap->iv_bss);
331                 break;
332         case IEEE80211_S_CSA:
333                 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
334                         /*
335                          * On a ``band change'' silently drop associated
336                          * stations as they must re-associate before they
337                          * can pass traffic (as otherwise protocol state
338                          * such as capabilities and the negotiated rate
339                          * set may/will be wrong).
340                          */
341                         ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap);
342                 }
343                 break;
344         default:
345                 break;
346         }
347         return 0;
348 }
349
350 static void
351 hostap_deliver_data(struct ieee80211vap *vap,
352         struct ieee80211_node *ni, struct mbuf *m)
353 {
354         struct ether_header *eh = mtod(m, struct ether_header *);
355         struct ifnet *ifp = vap->iv_ifp;
356
357         /* clear driver/net80211 flags before passing up */
358         m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST);
359
360         KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
361             ("gack, opmode %d", vap->iv_opmode));
362         /*
363          * Do accounting.
364          */
365         ifp->if_ipackets++;
366         IEEE80211_NODE_STAT(ni, rx_data);
367         IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
368         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
369                 m->m_flags |= M_MCAST;          /* XXX M_BCAST? */
370                 IEEE80211_NODE_STAT(ni, rx_mcast);
371         } else
372                 IEEE80211_NODE_STAT(ni, rx_ucast);
373
374         /* perform as a bridge within the AP */
375         if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
376                 struct mbuf *mcopy = NULL;
377
378                 if (m->m_flags & M_MCAST) {
379                         mcopy = m_dup(m, M_DONTWAIT);
380                         if (mcopy == NULL)
381                                 ifp->if_oerrors++;
382                         else
383                                 mcopy->m_flags |= M_MCAST;
384                 } else {
385                         /*
386                          * Check if the destination is associated with the
387                          * same vap and authorized to receive traffic.
388                          * Beware of traffic destined for the vap itself;
389                          * sending it will not work; just let it be delivered
390                          * normally.
391                          */
392                         struct ieee80211_node *sta = ieee80211_find_vap_node(
393                              &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
394                         if (sta != NULL) {
395                                 if (ieee80211_node_is_authorized(sta)) {
396                                         /*
397                                          * Beware of sending to ourself; this
398                                          * needs to happen via the normal
399                                          * input path.
400                                          */
401                                         if (sta != vap->iv_bss) {
402                                                 mcopy = m;
403                                                 m = NULL;
404                                         }
405                                 } else {
406                                         vap->iv_stats.is_rx_unauth++;
407                                         IEEE80211_NODE_STAT(sta, rx_unauth);
408                                 }
409                                 ieee80211_free_node(sta);
410                         }
411                 }
412                 if (mcopy != NULL) {
413                         int len, err;
414                         len = mcopy->m_pkthdr.len;
415                         err = ifp->if_transmit(ifp, mcopy);
416                         if (err) {
417                                 /* NB: IFQ_HANDOFF reclaims mcopy */
418                         } else {
419                                 ifp->if_opackets++;
420                         }
421                 }
422         }
423         if (m != NULL) {
424                 /*
425                  * Mark frame as coming from vap's interface.
426                  */
427                 m->m_pkthdr.rcvif = ifp;
428                 if (m->m_flags & M_MCAST) {
429                         /*
430                          * Spam DWDS vap's w/ multicast traffic.
431                          */
432                         /* XXX only if dwds in use? */
433                         ieee80211_dwds_mcast(vap, m);
434                 }
435                 if (ni->ni_vlan != 0) {
436                         /* attach vlan tag */
437                         m->m_pkthdr.ether_vtag = ni->ni_vlan;
438                         m->m_flags |= M_VLANTAG;
439                 }
440                 ifp->if_input(ifp, m);
441         }
442 }
443
444 /*
445  * Decide if a received management frame should be
446  * printed when debugging is enabled.  This filters some
447  * of the less interesting frames that come frequently
448  * (e.g. beacons).
449  */
450 static __inline int
451 doprint(struct ieee80211vap *vap, int subtype)
452 {
453         switch (subtype) {
454         case IEEE80211_FC0_SUBTYPE_BEACON:
455                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
456         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
457                 return 0;
458         }
459         return 1;
460 }
461
462 /*
463  * Process a received frame.  The node associated with the sender
464  * should be supplied.  If nothing was found in the node table then
465  * the caller is assumed to supply a reference to iv_bss instead.
466  * The RSSI and a timestamp are also supplied.  The RSSI data is used
467  * during AP scanning to select a AP to associate with; it can have
468  * any units so long as values have consistent units and higher values
469  * mean ``better signal''.  The receive timestamp is currently not used
470  * by the 802.11 layer.
471  */
472 static int
473 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
474 {
475 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
476 #define HAS_SEQ(type)   ((type & 0x4) == 0)
477         struct ieee80211vap *vap = ni->ni_vap;
478         struct ieee80211com *ic = ni->ni_ic;
479         struct ifnet *ifp = vap->iv_ifp;
480         struct ieee80211_frame *wh;
481         struct ieee80211_key *key;
482         struct ether_header *eh;
483         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
484         uint8_t dir, type, subtype, qos;
485         uint8_t *bssid;
486         uint16_t rxseq;
487
488         if (m->m_flags & M_AMPDU_MPDU) {
489                 /*
490                  * Fastpath for A-MPDU reorder q resubmission.  Frames
491                  * w/ M_AMPDU_MPDU marked have already passed through
492                  * here but were received out of order and been held on
493                  * the reorder queue.  When resubmitted they are marked
494                  * with the M_AMPDU_MPDU flag and we can bypass most of
495                  * the normal processing.
496                  */
497                 wh = mtod(m, struct ieee80211_frame *);
498                 type = IEEE80211_FC0_TYPE_DATA;
499                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
500                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
501                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
502                 goto resubmit_ampdu;
503         }
504
505         KASSERT(ni != NULL, ("null node"));
506         ni->ni_inact = ni->ni_inact_reload;
507
508         type = -1;                      /* undefined */
509
510         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
511                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
512                     ni->ni_macaddr, NULL,
513                     "too short (1): len %u", m->m_pkthdr.len);
514                 vap->iv_stats.is_rx_tooshort++;
515                 goto out;
516         }
517         /*
518          * Bit of a cheat here, we use a pointer for a 3-address
519          * frame format but don't reference fields past outside
520          * ieee80211_frame_min w/o first validating the data is
521          * present.
522          */
523         wh = mtod(m, struct ieee80211_frame *);
524
525         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
526             IEEE80211_FC0_VERSION_0) {
527                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
528                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
529                     wh->i_fc[0], wh->i_fc[1]);
530                 vap->iv_stats.is_rx_badversion++;
531                 goto err;
532         }
533
534         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
535         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
536         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
537         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
538                 if (dir != IEEE80211_FC1_DIR_NODS)
539                         bssid = wh->i_addr1;
540                 else if (type == IEEE80211_FC0_TYPE_CTL)
541                         bssid = wh->i_addr1;
542                 else {
543                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
544                                 IEEE80211_DISCARD_MAC(vap,
545                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
546                                     NULL, "too short (2): len %u",
547                                     m->m_pkthdr.len);
548                                 vap->iv_stats.is_rx_tooshort++;
549                                 goto out;
550                         }
551                         bssid = wh->i_addr3;
552                 }
553                 /*
554                  * Validate the bssid.
555                  */
556                 if (!(type == IEEE80211_FC0_TYPE_MGT &&
557                       subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
558                     !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
559                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
560                         /* not interested in */
561                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
562                             bssid, NULL, "%s", "not to bss");
563                         vap->iv_stats.is_rx_wrongbss++;
564                         goto out;
565                 }
566
567                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
568                 ni->ni_noise = nf;
569                 if (HAS_SEQ(type)) {
570                         uint8_t tid = ieee80211_gettid(wh);
571                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
572                             TID_TO_WME_AC(tid) >= WME_AC_VI)
573                                 ic->ic_wme.wme_hipri_traffic++;
574                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
575                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
576                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
577                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
578                                 /* duplicate, discard */
579                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
580                                     bssid, "duplicate",
581                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
582                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
583                                     ni->ni_rxseqs[tid] >>
584                                         IEEE80211_SEQ_SEQ_SHIFT,
585                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
586                                     ni->ni_rxseqs[tid] &
587                                         IEEE80211_SEQ_FRAG_MASK,
588                                     tid);
589                                 vap->iv_stats.is_rx_dup++;
590                                 IEEE80211_NODE_STAT(ni, rx_dup);
591                                 goto out;
592                         }
593                         ni->ni_rxseqs[tid] = rxseq;
594                 }
595         }
596
597         switch (type) {
598         case IEEE80211_FC0_TYPE_DATA:
599                 hdrspace = ieee80211_hdrspace(ic, wh);
600                 if (m->m_len < hdrspace &&
601                     (m = m_pullup(m, hdrspace)) == NULL) {
602                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
603                             ni->ni_macaddr, NULL,
604                             "data too short: expecting %u", hdrspace);
605                         vap->iv_stats.is_rx_tooshort++;
606                         goto out;               /* XXX */
607                 }
608                 if (!(dir == IEEE80211_FC1_DIR_TODS ||
609                      (dir == IEEE80211_FC1_DIR_DSTODS &&
610                       (vap->iv_flags & IEEE80211_F_DWDS)))) {
611                         if (dir != IEEE80211_FC1_DIR_DSTODS) {
612                                 IEEE80211_DISCARD(vap,
613                                     IEEE80211_MSG_INPUT, wh, "data",
614                                     "incorrect dir 0x%x", dir);
615                         } else {
616                                 IEEE80211_DISCARD(vap,
617                                     IEEE80211_MSG_INPUT |
618                                     IEEE80211_MSG_WDS, wh,
619                                     "4-address data",
620                                     "%s", "DWDS not enabled");
621                         }
622                         vap->iv_stats.is_rx_wrongdir++;
623                         goto out;
624                 }
625                 /* check if source STA is associated */
626                 if (ni == vap->iv_bss) {
627                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
628                             wh, "data", "%s", "unknown src");
629                         ieee80211_send_error(ni, wh->i_addr2,
630                             IEEE80211_FC0_SUBTYPE_DEAUTH,
631                             IEEE80211_REASON_NOT_AUTHED);
632                         vap->iv_stats.is_rx_notassoc++;
633                         goto err;
634                 }
635                 if (ni->ni_associd == 0) {
636                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
637                             wh, "data", "%s", "unassoc src");
638                         IEEE80211_SEND_MGMT(ni,
639                             IEEE80211_FC0_SUBTYPE_DISASSOC,
640                             IEEE80211_REASON_NOT_ASSOCED);
641                         vap->iv_stats.is_rx_notassoc++;
642                         goto err;
643                 }
644
645                 /*
646                  * Check for power save state change.
647                  * XXX out-of-order A-MPDU frames?
648                  */
649                 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
650                     (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
651                         ieee80211_node_pwrsave(ni,
652                                 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
653                 /*
654                  * For 4-address packets handle WDS discovery
655                  * notifications.  Once a WDS link is setup frames
656                  * are just delivered to the WDS vap (see below).
657                  */
658                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
659                         if (!ieee80211_node_is_authorized(ni)) {
660                                 IEEE80211_DISCARD(vap,
661                                     IEEE80211_MSG_INPUT |
662                                     IEEE80211_MSG_WDS, wh,
663                                     "4-address data",
664                                     "%s", "unauthorized port");
665                                 vap->iv_stats.is_rx_unauth++;
666                                 IEEE80211_NODE_STAT(ni, rx_unauth);
667                                 goto err;
668                         }
669                         ieee80211_dwds_discover(ni, m);
670                         return type;
671                 }
672
673                 /*
674                  * Handle A-MPDU re-ordering.  If the frame is to be
675                  * processed directly then ieee80211_ampdu_reorder
676                  * will return 0; otherwise it has consumed the mbuf
677                  * and we should do nothing more with it.
678                  */
679                 if ((m->m_flags & M_AMPDU) &&
680                     ieee80211_ampdu_reorder(ni, m) != 0) {
681                         m = NULL;
682                         goto out;
683                 }
684         resubmit_ampdu:
685
686                 /*
687                  * Handle privacy requirements.  Note that we
688                  * must not be preempted from here until after
689                  * we (potentially) call ieee80211_crypto_demic;
690                  * otherwise we may violate assumptions in the
691                  * crypto cipher modules used to do delayed update
692                  * of replay sequence numbers.
693                  */
694                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
695                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
696                                 /*
697                                  * Discard encrypted frames when privacy is off.
698                                  */
699                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
700                                     wh, "WEP", "%s", "PRIVACY off");
701                                 vap->iv_stats.is_rx_noprivacy++;
702                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
703                                 goto out;
704                         }
705                         key = ieee80211_crypto_decap(ni, m, hdrspace);
706                         if (key == NULL) {
707                                 /* NB: stats+msgs handled in crypto_decap */
708                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
709                                 goto out;
710                         }
711                         wh = mtod(m, struct ieee80211_frame *);
712                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
713                 } else {
714                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
715                         key = NULL;
716                 }
717
718                 /*
719                  * Save QoS bits for use below--before we strip the header.
720                  */
721                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
722                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
723                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
724                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
725                 } else
726                         qos = 0;
727
728                 /*
729                  * Next up, any fragmentation.
730                  */
731                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
732                         m = ieee80211_defrag(ni, m, hdrspace);
733                         if (m == NULL) {
734                                 /* Fragment dropped or frame not complete yet */
735                                 goto out;
736                         }
737                 }
738                 wh = NULL;              /* no longer valid, catch any uses */
739
740                 /*
741                  * Next strip any MSDU crypto bits.
742                  */
743                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
744                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
745                             ni->ni_macaddr, "data", "%s", "demic error");
746                         vap->iv_stats.is_rx_demicfail++;
747                         IEEE80211_NODE_STAT(ni, rx_demicfail);
748                         goto out;
749                 }
750                 /* copy to listener after decrypt */
751                 if (ieee80211_radiotap_active_vap(vap))
752                         ieee80211_radiotap_rx(vap, m);
753                 need_tap = 0;
754                 /*
755                  * Finally, strip the 802.11 header.
756                  */
757                 m = ieee80211_decap(vap, m, hdrspace);
758                 if (m == NULL) {
759                         /* XXX mask bit to check for both */
760                         /* don't count Null data frames as errors */
761                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
762                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
763                                 goto out;
764                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
765                             ni->ni_macaddr, "data", "%s", "decap error");
766                         vap->iv_stats.is_rx_decap++;
767                         IEEE80211_NODE_STAT(ni, rx_decap);
768                         goto err;
769                 }
770                 eh = mtod(m, struct ether_header *);
771                 if (!ieee80211_node_is_authorized(ni)) {
772                         /*
773                          * Deny any non-PAE frames received prior to
774                          * authorization.  For open/shared-key
775                          * authentication the port is mark authorized
776                          * after authentication completes.  For 802.1x
777                          * the port is not marked authorized by the
778                          * authenticator until the handshake has completed.
779                          */
780                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
781                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
782                                     eh->ether_shost, "data",
783                                     "unauthorized port: ether type 0x%x len %u",
784                                     eh->ether_type, m->m_pkthdr.len);
785                                 vap->iv_stats.is_rx_unauth++;
786                                 IEEE80211_NODE_STAT(ni, rx_unauth);
787                                 goto err;
788                         }
789                 } else {
790                         /*
791                          * When denying unencrypted frames, discard
792                          * any non-PAE frames received without encryption.
793                          */
794                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
795                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
796                             eh->ether_type != htons(ETHERTYPE_PAE)) {
797                                 /*
798                                  * Drop unencrypted frames.
799                                  */
800                                 vap->iv_stats.is_rx_unencrypted++;
801                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
802                                 goto out;
803                         }
804                 }
805                 /* XXX require HT? */
806                 if (qos & IEEE80211_QOS_AMSDU) {
807                         m = ieee80211_decap_amsdu(ni, m);
808                         if (m == NULL)
809                                 return IEEE80211_FC0_TYPE_DATA;
810                 } else {
811 #ifdef IEEE80211_SUPPORT_SUPERG
812                         m = ieee80211_decap_fastframe(vap, ni, m);
813                         if (m == NULL)
814                                 return IEEE80211_FC0_TYPE_DATA;
815 #endif
816                 }
817                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
818                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
819                 else
820                         hostap_deliver_data(vap, ni, m);
821                 return IEEE80211_FC0_TYPE_DATA;
822
823         case IEEE80211_FC0_TYPE_MGT:
824                 vap->iv_stats.is_rx_mgmt++;
825                 IEEE80211_NODE_STAT(ni, rx_mgmt);
826                 if (dir != IEEE80211_FC1_DIR_NODS) {
827                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
828                             wh, "mgt", "incorrect dir 0x%x", dir);
829                         vap->iv_stats.is_rx_wrongdir++;
830                         goto err;
831                 }
832                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
833                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
834                             ni->ni_macaddr, "mgt", "too short: len %u",
835                             m->m_pkthdr.len);
836                         vap->iv_stats.is_rx_tooshort++;
837                         goto out;
838                 }
839                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
840                         /* ensure return frames are unicast */
841                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
842                             wh, NULL, "source is multicast: %s",
843                             ether_sprintf(wh->i_addr2));
844                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
845                         goto out;
846                 }
847 #ifdef IEEE80211_DEBUG
848                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
849                     ieee80211_msg_dumppkts(vap)) {
850                         if_printf(ifp, "received %s from %s rssi %d\n",
851                             ieee80211_mgt_subtype_name[subtype >>
852                                 IEEE80211_FC0_SUBTYPE_SHIFT],
853                             ether_sprintf(wh->i_addr2), rssi);
854                 }
855 #endif
856                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
857                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
858                                 /*
859                                  * Only shared key auth frames with a challenge
860                                  * should be encrypted, discard all others.
861                                  */
862                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
863                                     wh, NULL,
864                                     "%s", "WEP set but not permitted");
865                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
866                                 goto out;
867                         }
868                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
869                                 /*
870                                  * Discard encrypted frames when privacy is off.
871                                  */
872                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
873                                     wh, NULL, "%s", "WEP set but PRIVACY off");
874                                 vap->iv_stats.is_rx_noprivacy++;
875                                 goto out;
876                         }
877                         hdrspace = ieee80211_hdrspace(ic, wh);
878                         key = ieee80211_crypto_decap(ni, m, hdrspace);
879                         if (key == NULL) {
880                                 /* NB: stats+msgs handled in crypto_decap */
881                                 goto out;
882                         }
883                         wh = mtod(m, struct ieee80211_frame *);
884                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
885                 }
886                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
887                 goto out;
888
889         case IEEE80211_FC0_TYPE_CTL:
890                 vap->iv_stats.is_rx_ctl++;
891                 IEEE80211_NODE_STAT(ni, rx_ctrl);
892                 vap->iv_recv_ctl(ni, m, subtype);
893                 goto out;
894         default:
895                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
896                     wh, "bad", "frame type 0x%x", type);
897                 /* should not come here */
898                 break;
899         }
900 err:
901         ifp->if_ierrors++;
902 out:
903         if (m != NULL) {
904                 if (need_tap && ieee80211_radiotap_active_vap(vap))
905                         ieee80211_radiotap_rx(vap, m);
906                 m_freem(m);
907         }
908         return type;
909 #undef SEQ_LEQ
910 }
911
912 static void
913 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
914     int rssi, int nf, uint16_t seq, uint16_t status)
915 {
916         struct ieee80211vap *vap = ni->ni_vap;
917
918         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
919
920         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
921                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
922                     ni->ni_macaddr, "open auth",
923                     "bad sta auth mode %u", ni->ni_authmode);
924                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
925                 /*
926                  * Clear any challenge text that may be there if
927                  * a previous shared key auth failed and then an
928                  * open auth is attempted.
929                  */
930                 if (ni->ni_challenge != NULL) {
931                         free(ni->ni_challenge, M_80211_NODE);
932                         ni->ni_challenge = NULL;
933                 }
934                 /* XXX hack to workaround calling convention */
935                 ieee80211_send_error(ni, wh->i_addr2, 
936                     IEEE80211_FC0_SUBTYPE_AUTH,
937                     (seq + 1) | (IEEE80211_STATUS_ALG<<16));
938                 return;
939         }
940         if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
941                 vap->iv_stats.is_rx_bad_auth++;
942                 return;
943         }
944         /* always accept open authentication requests */
945         if (ni == vap->iv_bss) {
946                 ni = ieee80211_dup_bss(vap, wh->i_addr2);
947                 if (ni == NULL)
948                         return;
949         } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
950                 (void) ieee80211_ref_node(ni);
951         /*
952          * Mark the node as referenced to reflect that it's
953          * reference count has been bumped to insure it remains
954          * after the transaction completes.
955          */
956         ni->ni_flags |= IEEE80211_NODE_AREF;
957         /*
958          * Mark the node as requiring a valid association id
959          * before outbound traffic is permitted.
960          */
961         ni->ni_flags |= IEEE80211_NODE_ASSOCID;
962
963         if (vap->iv_acl != NULL &&
964             vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
965                 /*
966                  * When the ACL policy is set to RADIUS we defer the
967                  * authorization to a user agent.  Dispatch an event,
968                  * a subsequent MLME call will decide the fate of the
969                  * station.  If the user agent is not present then the
970                  * node will be reclaimed due to inactivity.
971                  */
972                 IEEE80211_NOTE_MAC(vap,
973                     IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
974                     "%s", "station authentication defered (radius acl)");
975                 ieee80211_notify_node_auth(ni);
976         } else {
977                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
978                 IEEE80211_NOTE_MAC(vap,
979                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
980                     "%s", "station authenticated (open)");
981                 /*
982                  * When 802.1x is not in use mark the port
983                  * authorized at this point so traffic can flow.
984                  */
985                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
986                         ieee80211_node_authorize(ni);
987         }
988 }
989
990 static void
991 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
992     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
993     uint16_t seq, uint16_t status)
994 {
995         struct ieee80211vap *vap = ni->ni_vap;
996         uint8_t *challenge;
997         int allocbs, estatus;
998
999         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
1000
1001         /*
1002          * NB: this can happen as we allow pre-shared key
1003          * authentication to be enabled w/o wep being turned
1004          * on so that configuration of these can be done
1005          * in any order.  It may be better to enforce the
1006          * ordering in which case this check would just be
1007          * for sanity/consistency.
1008          */
1009         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1010                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1011                     ni->ni_macaddr, "shared key auth",
1012                     "%s", " PRIVACY is disabled");
1013                 estatus = IEEE80211_STATUS_ALG;
1014                 goto bad;
1015         }
1016         /*
1017          * Pre-shared key authentication is evil; accept
1018          * it only if explicitly configured (it is supported
1019          * mainly for compatibility with clients like Mac OS X).
1020          */
1021         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1022             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1023                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1024                     ni->ni_macaddr, "shared key auth",
1025                     "bad sta auth mode %u", ni->ni_authmode);
1026                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1027                 estatus = IEEE80211_STATUS_ALG;
1028                 goto bad;
1029         }
1030
1031         challenge = NULL;
1032         if (frm + 1 < efrm) {
1033                 if ((frm[1] + 2) > (efrm - frm)) {
1034                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1035                             ni->ni_macaddr, "shared key auth",
1036                             "ie %d/%d too long",
1037                             frm[0], (frm[1] + 2) - (efrm - frm));
1038                         vap->iv_stats.is_rx_bad_auth++;
1039                         estatus = IEEE80211_STATUS_CHALLENGE;
1040                         goto bad;
1041                 }
1042                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1043                         challenge = frm;
1044                 frm += frm[1] + 2;
1045         }
1046         switch (seq) {
1047         case IEEE80211_AUTH_SHARED_CHALLENGE:
1048         case IEEE80211_AUTH_SHARED_RESPONSE:
1049                 if (challenge == NULL) {
1050                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1051                             ni->ni_macaddr, "shared key auth",
1052                             "%s", "no challenge");
1053                         vap->iv_stats.is_rx_bad_auth++;
1054                         estatus = IEEE80211_STATUS_CHALLENGE;
1055                         goto bad;
1056                 }
1057                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1058                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1059                             ni->ni_macaddr, "shared key auth",
1060                             "bad challenge len %d", challenge[1]);
1061                         vap->iv_stats.is_rx_bad_auth++;
1062                         estatus = IEEE80211_STATUS_CHALLENGE;
1063                         goto bad;
1064                 }
1065         default:
1066                 break;
1067         }
1068         switch (seq) {
1069         case IEEE80211_AUTH_SHARED_REQUEST:
1070                 if (ni == vap->iv_bss) {
1071                         ni = ieee80211_dup_bss(vap, wh->i_addr2);
1072                         if (ni == NULL) {
1073                                 /* NB: no way to return an error */
1074                                 return;
1075                         }
1076                         allocbs = 1;
1077                 } else {
1078                         if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1079                                 (void) ieee80211_ref_node(ni);
1080                         allocbs = 0;
1081                 }
1082                 /*
1083                  * Mark the node as referenced to reflect that it's
1084                  * reference count has been bumped to insure it remains
1085                  * after the transaction completes.
1086                  */
1087                 ni->ni_flags |= IEEE80211_NODE_AREF;
1088                 /*
1089                  * Mark the node as requiring a valid associatio id
1090                  * before outbound traffic is permitted.
1091                  */
1092                 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1093                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1094                 ni->ni_noise = nf;
1095                 if (!ieee80211_alloc_challenge(ni)) {
1096                         /* NB: don't return error so they rexmit */
1097                         return;
1098                 }
1099                 get_random_bytes(ni->ni_challenge,
1100                         IEEE80211_CHALLENGE_LEN);
1101                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1102                     ni, "shared key %sauth request", allocbs ? "" : "re");
1103                 /*
1104                  * When the ACL policy is set to RADIUS we defer the
1105                  * authorization to a user agent.  Dispatch an event,
1106                  * a subsequent MLME call will decide the fate of the
1107                  * station.  If the user agent is not present then the
1108                  * node will be reclaimed due to inactivity.
1109                  */
1110                 if (vap->iv_acl != NULL &&
1111                     vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1112                         IEEE80211_NOTE_MAC(vap,
1113                             IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1114                             ni->ni_macaddr,
1115                             "%s", "station authentication defered (radius acl)");
1116                         ieee80211_notify_node_auth(ni);
1117                         return;
1118                 }
1119                 break;
1120         case IEEE80211_AUTH_SHARED_RESPONSE:
1121                 if (ni == vap->iv_bss) {
1122                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1123                             ni->ni_macaddr, "shared key response",
1124                             "%s", "unknown station");
1125                         /* NB: don't send a response */
1126                         return;
1127                 }
1128                 if (ni->ni_challenge == NULL) {
1129                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1130                             ni->ni_macaddr, "shared key response",
1131                             "%s", "no challenge recorded");
1132                         vap->iv_stats.is_rx_bad_auth++;
1133                         estatus = IEEE80211_STATUS_CHALLENGE;
1134                         goto bad;
1135                 }
1136                 if (memcmp(ni->ni_challenge, &challenge[2],
1137                            challenge[1]) != 0) {
1138                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1139                             ni->ni_macaddr, "shared key response",
1140                             "%s", "challenge mismatch");
1141                         vap->iv_stats.is_rx_auth_fail++;
1142                         estatus = IEEE80211_STATUS_CHALLENGE;
1143                         goto bad;
1144                 }
1145                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1146                     ni, "%s", "station authenticated (shared key)");
1147                 ieee80211_node_authorize(ni);
1148                 break;
1149         default:
1150                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1151                     ni->ni_macaddr, "shared key auth",
1152                     "bad seq %d", seq);
1153                 vap->iv_stats.is_rx_bad_auth++;
1154                 estatus = IEEE80211_STATUS_SEQUENCE;
1155                 goto bad;
1156         }
1157         IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1158         return;
1159 bad:
1160         /*
1161          * Send an error response; but only when operating as an AP.
1162          */
1163         /* XXX hack to workaround calling convention */
1164         ieee80211_send_error(ni, wh->i_addr2,
1165             IEEE80211_FC0_SUBTYPE_AUTH,
1166             (seq + 1) | (estatus<<16));
1167 }
1168
1169 /*
1170  * Convert a WPA cipher selector OUI to an internal
1171  * cipher algorithm.  Where appropriate we also
1172  * record any key length.
1173  */
1174 static int
1175 wpa_cipher(const uint8_t *sel, uint8_t *keylen)
1176 {
1177 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1178         uint32_t w = LE_READ_4(sel);
1179
1180         switch (w) {
1181         case WPA_SEL(WPA_CSE_NULL):
1182                 return IEEE80211_CIPHER_NONE;
1183         case WPA_SEL(WPA_CSE_WEP40):
1184                 if (keylen)
1185                         *keylen = 40 / NBBY;
1186                 return IEEE80211_CIPHER_WEP;
1187         case WPA_SEL(WPA_CSE_WEP104):
1188                 if (keylen)
1189                         *keylen = 104 / NBBY;
1190                 return IEEE80211_CIPHER_WEP;
1191         case WPA_SEL(WPA_CSE_TKIP):
1192                 return IEEE80211_CIPHER_TKIP;
1193         case WPA_SEL(WPA_CSE_CCMP):
1194                 return IEEE80211_CIPHER_AES_CCM;
1195         }
1196         return 32;              /* NB: so 1<< is discarded */
1197 #undef WPA_SEL
1198 }
1199
1200 /*
1201  * Convert a WPA key management/authentication algorithm
1202  * to an internal code.
1203  */
1204 static int
1205 wpa_keymgmt(const uint8_t *sel)
1206 {
1207 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1208         uint32_t w = LE_READ_4(sel);
1209
1210         switch (w) {
1211         case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1212                 return WPA_ASE_8021X_UNSPEC;
1213         case WPA_SEL(WPA_ASE_8021X_PSK):
1214                 return WPA_ASE_8021X_PSK;
1215         case WPA_SEL(WPA_ASE_NONE):
1216                 return WPA_ASE_NONE;
1217         }
1218         return 0;               /* NB: so is discarded */
1219 #undef WPA_SEL
1220 }
1221
1222 /*
1223  * Parse a WPA information element to collect parameters.
1224  * Note that we do not validate security parameters; that
1225  * is handled by the authenticator; the parsing done here
1226  * is just for internal use in making operational decisions.
1227  */
1228 static int
1229 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1230         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1231 {
1232         uint8_t len = frm[1];
1233         uint32_t w;
1234         int n;
1235
1236         /*
1237          * Check the length once for fixed parts: OUI, type,
1238          * version, mcast cipher, and 2 selector counts.
1239          * Other, variable-length data, must be checked separately.
1240          */
1241         if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1242                 IEEE80211_DISCARD_IE(vap,
1243                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1244                     wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1245                 return IEEE80211_REASON_IE_INVALID;
1246         }
1247         if (len < 14) {
1248                 IEEE80211_DISCARD_IE(vap,
1249                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1250                     wh, "WPA", "too short, len %u", len);
1251                 return IEEE80211_REASON_IE_INVALID;
1252         }
1253         frm += 6, len -= 4;             /* NB: len is payload only */
1254         /* NB: iswpaoui already validated the OUI and type */
1255         w = LE_READ_2(frm);
1256         if (w != WPA_VERSION) {
1257                 IEEE80211_DISCARD_IE(vap,
1258                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1259                     wh, "WPA", "bad version %u", w);
1260                 return IEEE80211_REASON_IE_INVALID;
1261         }
1262         frm += 2, len -= 2;
1263
1264         memset(rsn, 0, sizeof(*rsn));
1265
1266         /* multicast/group cipher */
1267         rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
1268         frm += 4, len -= 4;
1269
1270         /* unicast ciphers */
1271         n = LE_READ_2(frm);
1272         frm += 2, len -= 2;
1273         if (len < n*4+2) {
1274                 IEEE80211_DISCARD_IE(vap,
1275                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1276                     wh, "WPA", "ucast cipher data too short; len %u, n %u",
1277                     len, n);
1278                 return IEEE80211_REASON_IE_INVALID;
1279         }
1280         w = 0;
1281         for (; n > 0; n--) {
1282                 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
1283                 frm += 4, len -= 4;
1284         }
1285         if (w & (1<<IEEE80211_CIPHER_TKIP))
1286                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1287         else
1288                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1289
1290         /* key management algorithms */
1291         n = LE_READ_2(frm);
1292         frm += 2, len -= 2;
1293         if (len < n*4) {
1294                 IEEE80211_DISCARD_IE(vap,
1295                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1296                     wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1297                     len, n);
1298                 return IEEE80211_REASON_IE_INVALID;
1299         }
1300         w = 0;
1301         for (; n > 0; n--) {
1302                 w |= wpa_keymgmt(frm);
1303                 frm += 4, len -= 4;
1304         }
1305         if (w & WPA_ASE_8021X_UNSPEC)
1306                 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1307         else
1308                 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1309
1310         if (len > 2)            /* optional capabilities */
1311                 rsn->rsn_caps = LE_READ_2(frm);
1312
1313         return 0;
1314 }
1315
1316 /*
1317  * Convert an RSN cipher selector OUI to an internal
1318  * cipher algorithm.  Where appropriate we also
1319  * record any key length.
1320  */
1321 static int
1322 rsn_cipher(const uint8_t *sel, uint8_t *keylen)
1323 {
1324 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1325         uint32_t w = LE_READ_4(sel);
1326
1327         switch (w) {
1328         case RSN_SEL(RSN_CSE_NULL):
1329                 return IEEE80211_CIPHER_NONE;
1330         case RSN_SEL(RSN_CSE_WEP40):
1331                 if (keylen)
1332                         *keylen = 40 / NBBY;
1333                 return IEEE80211_CIPHER_WEP;
1334         case RSN_SEL(RSN_CSE_WEP104):
1335                 if (keylen)
1336                         *keylen = 104 / NBBY;
1337                 return IEEE80211_CIPHER_WEP;
1338         case RSN_SEL(RSN_CSE_TKIP):
1339                 return IEEE80211_CIPHER_TKIP;
1340         case RSN_SEL(RSN_CSE_CCMP):
1341                 return IEEE80211_CIPHER_AES_CCM;
1342         case RSN_SEL(RSN_CSE_WRAP):
1343                 return IEEE80211_CIPHER_AES_OCB;
1344         }
1345         return 32;              /* NB: so 1<< is discarded */
1346 #undef WPA_SEL
1347 }
1348
1349 /*
1350  * Convert an RSN key management/authentication algorithm
1351  * to an internal code.
1352  */
1353 static int
1354 rsn_keymgmt(const uint8_t *sel)
1355 {
1356 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1357         uint32_t w = LE_READ_4(sel);
1358
1359         switch (w) {
1360         case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1361                 return RSN_ASE_8021X_UNSPEC;
1362         case RSN_SEL(RSN_ASE_8021X_PSK):
1363                 return RSN_ASE_8021X_PSK;
1364         case RSN_SEL(RSN_ASE_NONE):
1365                 return RSN_ASE_NONE;
1366         }
1367         return 0;               /* NB: so is discarded */
1368 #undef RSN_SEL
1369 }
1370
1371 /*
1372  * Parse a WPA/RSN information element to collect parameters
1373  * and validate the parameters against what has been
1374  * configured for the system.
1375  */
1376 static int
1377 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1378         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1379 {
1380         uint8_t len = frm[1];
1381         uint32_t w;
1382         int n;
1383
1384         /*
1385          * Check the length once for fixed parts: 
1386          * version, mcast cipher, and 2 selector counts.
1387          * Other, variable-length data, must be checked separately.
1388          */
1389         if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1390                 IEEE80211_DISCARD_IE(vap,
1391                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1392                     wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1393                 return IEEE80211_REASON_IE_INVALID;
1394         }
1395         if (len < 10) {
1396                 IEEE80211_DISCARD_IE(vap,
1397                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1398                     wh, "RSN", "too short, len %u", len);
1399                 return IEEE80211_REASON_IE_INVALID;
1400         }
1401         frm += 2;
1402         w = LE_READ_2(frm);
1403         if (w != RSN_VERSION) {
1404                 IEEE80211_DISCARD_IE(vap,
1405                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1406                     wh, "RSN", "bad version %u", w);
1407                 return IEEE80211_REASON_IE_INVALID;
1408         }
1409         frm += 2, len -= 2;
1410
1411         memset(rsn, 0, sizeof(*rsn));
1412
1413         /* multicast/group cipher */
1414         rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
1415         frm += 4, len -= 4;
1416
1417         /* unicast ciphers */
1418         n = LE_READ_2(frm);
1419         frm += 2, len -= 2;
1420         if (len < n*4+2) {
1421                 IEEE80211_DISCARD_IE(vap,
1422                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1423                     wh, "RSN", "ucast cipher data too short; len %u, n %u",
1424                     len, n);
1425                 return IEEE80211_REASON_IE_INVALID;
1426         }
1427         w = 0;
1428         for (; n > 0; n--) {
1429                 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
1430                 frm += 4, len -= 4;
1431         }
1432         if (w & (1<<IEEE80211_CIPHER_TKIP))
1433                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1434         else
1435                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1436
1437         /* key management algorithms */
1438         n = LE_READ_2(frm);
1439         frm += 2, len -= 2;
1440         if (len < n*4) {
1441                 IEEE80211_DISCARD_IE(vap,
1442                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1443                     wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1444                     len, n);
1445                 return IEEE80211_REASON_IE_INVALID;
1446         }
1447         w = 0;
1448         for (; n > 0; n--) {
1449                 w |= rsn_keymgmt(frm);
1450                 frm += 4, len -= 4;
1451         }
1452         if (w & RSN_ASE_8021X_UNSPEC)
1453                 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1454         else
1455                 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1456
1457         /* optional RSN capabilities */
1458         if (len > 2)
1459                 rsn->rsn_caps = LE_READ_2(frm);
1460         /* XXXPMKID */
1461
1462         return 0;
1463 }
1464
1465 /*
1466  * WPA/802.11i assocation request processing.
1467  */
1468 static int
1469 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1470         const struct ieee80211_frame *wh, const uint8_t *wpa,
1471         const uint8_t *rsn, uint16_t capinfo)
1472 {
1473         struct ieee80211vap *vap = ni->ni_vap;
1474         uint8_t reason;
1475         int badwparsn;
1476
1477         ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1478         if (wpa == NULL && rsn == NULL) {
1479                 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1480                         /*
1481                          * W-Fi Protected Setup (WPS) permits
1482                          * clients to associate and pass EAPOL frames
1483                          * to establish initial credentials.
1484                          */
1485                         ni->ni_flags |= IEEE80211_NODE_WPS;
1486                         return 1;
1487                 }
1488                 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1489                     (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1490                         /* 
1491                          * Transitional Security Network.  Permits clients
1492                          * to associate and use WEP while WPA is configured.
1493                          */
1494                         ni->ni_flags |= IEEE80211_NODE_TSN;
1495                         return 1;
1496                 }
1497                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1498                     wh, NULL, "%s", "no WPA/RSN IE in association request");
1499                 vap->iv_stats.is_rx_assoc_badwpaie++;
1500                 reason = IEEE80211_REASON_IE_INVALID;
1501                 goto bad;
1502         }
1503         /* assert right association security credentials */
1504         badwparsn = 0;                  /* NB: to silence compiler */
1505         switch (vap->iv_flags & IEEE80211_F_WPA) {
1506         case IEEE80211_F_WPA1:
1507                 badwparsn = (wpa == NULL);
1508                 break;
1509         case IEEE80211_F_WPA2:
1510                 badwparsn = (rsn == NULL);
1511                 break;
1512         case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1513                 badwparsn = (wpa == NULL && rsn == NULL);
1514                 break;
1515         }
1516         if (badwparsn) {
1517                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1518                     wh, NULL,
1519                     "%s", "missing WPA/RSN IE in association request");
1520                 vap->iv_stats.is_rx_assoc_badwpaie++;
1521                 reason = IEEE80211_REASON_IE_INVALID;
1522                 goto bad;
1523         }
1524         /*
1525          * Parse WPA/RSN information element.
1526          */
1527         if (wpa != NULL)
1528                 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1529         else
1530                 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1531         if (reason != 0) {
1532                 /* XXX distinguish WPA/RSN? */
1533                 vap->iv_stats.is_rx_assoc_badwpaie++;
1534                 goto bad;
1535         }
1536         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1537             "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1538             wpa != NULL ? "WPA" : "RSN",
1539             rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1540             rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1541             rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1542
1543         return 1;
1544 bad:
1545         ieee80211_node_deauth(ni, reason);
1546         return 0;
1547 }
1548
1549 /* XXX find a better place for definition */
1550 struct l2_update_frame {
1551         struct ether_header eh;
1552         uint8_t dsap;
1553         uint8_t ssap;
1554         uint8_t control;
1555         uint8_t xid[3];
1556 }  __packed;
1557
1558 /*
1559  * Deliver a TGf L2UF frame on behalf of a station.
1560  * This primes any bridge when the station is roaming
1561  * between ap's on the same wired network.
1562  */
1563 static void
1564 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1565 {
1566         struct ieee80211vap *vap = ni->ni_vap;
1567         struct ifnet *ifp = vap->iv_ifp;
1568         struct mbuf *m;
1569         struct l2_update_frame *l2uf;
1570         struct ether_header *eh;
1571         
1572         m = m_gethdr(M_NOWAIT, MT_DATA);
1573         if (m == NULL) {
1574                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1575                     "%s", "no mbuf for l2uf frame");
1576                 vap->iv_stats.is_rx_nobuf++;    /* XXX not right */
1577                 return;
1578         }
1579         l2uf = mtod(m, struct l2_update_frame *);
1580         eh = &l2uf->eh;
1581         /* dst: Broadcast address */
1582         IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1583         /* src: associated STA */
1584         IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1585         eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1586         
1587         l2uf->dsap = 0;
1588         l2uf->ssap = 0;
1589         l2uf->control = 0xf5;
1590         l2uf->xid[0] = 0x81;
1591         l2uf->xid[1] = 0x80;
1592         l2uf->xid[2] = 0x00;
1593         
1594         m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1595         hostap_deliver_data(vap, ni, m);
1596 }
1597
1598 static void
1599 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1600         int reassoc, int resp, const char *tag, int rate)
1601 {
1602         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1603             "deny %s request, %s rate set mismatch, rate/MCS %d",
1604             reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1605         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1606         ieee80211_node_leave(ni);
1607 }
1608
1609 static void
1610 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1611         int reassoc, int resp, const char *tag, int capinfo)
1612 {
1613         struct ieee80211vap *vap = ni->ni_vap;
1614
1615         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1616             "deny %s request, %s mismatch 0x%x",
1617             reassoc ? "reassoc" : "assoc", tag, capinfo);
1618         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1619         ieee80211_node_leave(ni);
1620         vap->iv_stats.is_rx_assoc_capmismatch++;
1621 }
1622
1623 static void
1624 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1625         int reassoc, int resp)
1626 {
1627         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1628             "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1629         /* XXX no better code */
1630         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1631         ieee80211_node_leave(ni);
1632 }
1633
1634 static void
1635 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1636         int algo, int seq, int status)
1637 {
1638         struct ieee80211vap *vap = ni->ni_vap;
1639
1640         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1641             wh, NULL, "unsupported alg %d", algo);
1642         vap->iv_stats.is_rx_auth_unsupported++;
1643         ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1644             seq | (status << 16));
1645 }
1646
1647 static __inline int
1648 ishtmixed(const uint8_t *ie)
1649 {
1650         const struct ieee80211_ie_htinfo *ht =
1651             (const struct ieee80211_ie_htinfo *) ie;
1652         return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1653             IEEE80211_HTINFO_OPMODE_MIXED;
1654 }
1655
1656 static int
1657 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1658 {
1659         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1660         int i;
1661
1662         /* NB: the 11b clients we care about will not have xrates */
1663         if (xrates != NULL || rates == NULL)
1664                 return 0;
1665         for (i = 0; i < rates[1]; i++) {
1666                 int r = rates[2+i] & IEEE80211_RATE_VAL;
1667                 if (r > 2*11 || ((1<<r) & brates) == 0)
1668                         return 0;
1669         }
1670         return 1;
1671 }
1672
1673 static void
1674 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1675         int subtype, int rssi, int nf)
1676 {
1677         struct ieee80211vap *vap = ni->ni_vap;
1678         struct ieee80211com *ic = ni->ni_ic;
1679         struct ieee80211_frame *wh;
1680         uint8_t *frm, *efrm, *sfrm;
1681         uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1682         int reassoc, resp;
1683         uint8_t rate;
1684
1685         wh = mtod(m0, struct ieee80211_frame *);
1686         frm = (uint8_t *)&wh[1];
1687         efrm = mtod(m0, uint8_t *) + m0->m_len;
1688         switch (subtype) {
1689         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1690         case IEEE80211_FC0_SUBTYPE_BEACON: {
1691                 struct ieee80211_scanparams scan;
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                     subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
1699                         vap->iv_stats.is_rx_mgtdiscard++;
1700                         return;
1701                 }
1702                 /* NB: accept off-channel frames */
1703                 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1704                         return;
1705                 /*
1706                  * Count frame now that we know it's to be processed.
1707                  */
1708                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1709                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1710                         IEEE80211_NODE_STAT(ni, rx_beacons);
1711                 } else
1712                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1713                 /*
1714                  * If scanning, just pass information to the scan module.
1715                  */
1716                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1717                         if (scan.status == 0 &&         /* NB: on channel */
1718                             (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1719                                 /*
1720                                  * Actively scanning a channel marked passive;
1721                                  * send a probe request now that we know there
1722                                  * is 802.11 traffic present.
1723                                  *
1724                                  * XXX check if the beacon we recv'd gives
1725                                  * us what we need and suppress the probe req
1726                                  */
1727                                 ieee80211_probe_curchan(vap, 1);
1728                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1729                         }
1730                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1731                         return;
1732                 }
1733                 /*
1734                  * Check beacon for overlapping bss w/ non ERP stations.
1735                  * If we detect one and protection is configured but not
1736                  * enabled, enable it and start a timer that'll bring us
1737                  * out if we stop seeing the bss.
1738                  */
1739                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1740                     scan.status == 0 &&                 /* NB: on-channel */
1741                     ((scan.erp & 0x100) == 0 ||         /* NB: no ERP, 11b sta*/
1742                      (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1743                         ic->ic_lastnonerp = ticks;
1744                         ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1745                         if (ic->ic_protmode != IEEE80211_PROT_NONE &&
1746                             (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
1747                                 IEEE80211_NOTE_FRAME(vap,
1748                                     IEEE80211_MSG_ASSOC, wh,
1749                                     "non-ERP present on channel %d "
1750                                     "(saw erp 0x%x from channel %d), "
1751                                     "enable use of protection",
1752                                     ic->ic_curchan->ic_ieee,
1753                                     scan.erp, scan.chan);
1754                                 ic->ic_flags |= IEEE80211_F_USEPROT;
1755                                 ieee80211_notify_erp(ic);
1756                         }
1757                 }
1758                 /* 
1759                  * Check beacon for non-HT station on HT channel
1760                  * and update HT BSS occupancy as appropriate.
1761                  */
1762                 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1763                         if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1764                                 /*
1765                                  * Off control channel; only check frames
1766                                  * that come in the extension channel when
1767                                  * operating w/ HT40.
1768                                  */
1769                                 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1770                                         break;
1771                                 if (scan.chan != ic->ic_curchan->ic_extieee)
1772                                         break;
1773                         }
1774                         if (scan.htinfo == NULL) {
1775                                 ieee80211_htprot_update(ic,
1776                                     IEEE80211_HTINFO_OPMODE_PROTOPT |
1777                                     IEEE80211_HTINFO_NONHT_PRESENT);
1778                         } else if (ishtmixed(scan.htinfo)) {
1779                                 /* XXX? take NONHT_PRESENT from beacon? */
1780                                 ieee80211_htprot_update(ic,
1781                                     IEEE80211_HTINFO_OPMODE_MIXED |
1782                                     IEEE80211_HTINFO_NONHT_PRESENT);
1783                         }
1784                 }
1785                 break;
1786         }
1787
1788         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1789                 if (vap->iv_state != IEEE80211_S_RUN) {
1790                         vap->iv_stats.is_rx_mgtdiscard++;
1791                         return;
1792                 }
1793                 /*
1794                  * prreq frame format
1795                  *      [tlv] ssid
1796                  *      [tlv] supported rates
1797                  *      [tlv] extended supported rates
1798                  */
1799                 ssid = rates = xrates = NULL;
1800                 sfrm = frm;
1801                 while (efrm - frm > 1) {
1802                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1803                         switch (*frm) {
1804                         case IEEE80211_ELEMID_SSID:
1805                                 ssid = frm;
1806                                 break;
1807                         case IEEE80211_ELEMID_RATES:
1808                                 rates = frm;
1809                                 break;
1810                         case IEEE80211_ELEMID_XRATES:
1811                                 xrates = frm;
1812                                 break;
1813                         }
1814                         frm += frm[1] + 2;
1815                 }
1816                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1817                 if (xrates != NULL)
1818                         IEEE80211_VERIFY_ELEMENT(xrates,
1819                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1820                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1821                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1822                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1823                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1824                             wh, NULL,
1825                             "%s", "no ssid with ssid suppression enabled");
1826                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1827                         return;
1828                 }
1829
1830                 /* XXX find a better class or define it's own */
1831                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1832                     "%s", "recv probe req");
1833                 /*
1834                  * Some legacy 11b clients cannot hack a complete
1835                  * probe response frame.  When the request includes
1836                  * only a bare-bones rate set, communicate this to
1837                  * the transmit side.
1838                  */
1839                 ieee80211_send_proberesp(vap, wh->i_addr2,
1840                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1841                 break;
1842
1843         case IEEE80211_FC0_SUBTYPE_AUTH: {
1844                 uint16_t algo, seq, status;
1845
1846                 if (vap->iv_state != IEEE80211_S_RUN) {
1847                         vap->iv_stats.is_rx_mgtdiscard++;
1848                         return;
1849                 }
1850                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1851                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1852                             wh, NULL, "%s", "wrong bssid");
1853                         vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1854                         return;
1855                 }
1856                 /*
1857                  * auth frame format
1858                  *      [2] algorithm
1859                  *      [2] sequence
1860                  *      [2] status
1861                  *      [tlv*] challenge
1862                  */
1863                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1864                 algo   = le16toh(*(uint16_t *)frm);
1865                 seq    = le16toh(*(uint16_t *)(frm + 2));
1866                 status = le16toh(*(uint16_t *)(frm + 4));
1867                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1868                     "recv auth frame with algorithm %d seq %d", algo, seq);
1869                 /*
1870                  * Consult the ACL policy module if setup.
1871                  */
1872                 if (vap->iv_acl != NULL &&
1873                     !vap->iv_acl->iac_check(vap, wh->i_addr2)) {
1874                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1875                             wh, NULL, "%s", "disallowed by ACL");
1876                         vap->iv_stats.is_rx_acl++;
1877                         ieee80211_send_error(ni, wh->i_addr2,
1878                             IEEE80211_FC0_SUBTYPE_AUTH,
1879                             (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1880                         return;
1881                 }
1882                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1883                         IEEE80211_DISCARD(vap,
1884                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1885                             wh, NULL, "%s", "TKIP countermeasures enabled");
1886                         vap->iv_stats.is_rx_auth_countermeasures++;
1887                         ieee80211_send_error(ni, wh->i_addr2,
1888                                 IEEE80211_FC0_SUBTYPE_AUTH,
1889                                 IEEE80211_REASON_MIC_FAILURE);
1890                         return;
1891                 }
1892                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1893                         hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1894                             seq, status);
1895                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1896                         hostap_auth_open(ni, wh, rssi, nf, seq, status);
1897                 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1898                         authalgreject(ni, wh, algo,
1899                             seq+1, IEEE80211_STATUS_ALG);
1900                         return;
1901                 } else {
1902                         /*
1903                          * We assume that an unknown algorithm is the result
1904                          * of a decryption failure on a shared key auth frame;
1905                          * return a status code appropriate for that instead
1906                          * of IEEE80211_STATUS_ALG.
1907                          *
1908                          * NB: a seq# of 4 is intentional; the decrypted
1909                          *     frame likely has a bogus seq value.
1910                          */
1911                         authalgreject(ni, wh, algo,
1912                             4, IEEE80211_STATUS_CHALLENGE);
1913                         return;
1914                 } 
1915                 break;
1916         }
1917
1918         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1919         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
1920                 uint16_t capinfo, lintval;
1921                 struct ieee80211_rsnparms rsnparms;
1922
1923                 if (vap->iv_state != IEEE80211_S_RUN) {
1924                         vap->iv_stats.is_rx_mgtdiscard++;
1925                         return;
1926                 }
1927                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1928                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1929                             wh, NULL, "%s", "wrong bssid");
1930                         vap->iv_stats.is_rx_assoc_bss++;
1931                         return;
1932                 }
1933                 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1934                         reassoc = 1;
1935                         resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
1936                 } else {
1937                         reassoc = 0;
1938                         resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
1939                 }
1940                 if (ni == vap->iv_bss) {
1941                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1942                             "deny %s request, sta not authenticated",
1943                             reassoc ? "reassoc" : "assoc");
1944                         ieee80211_send_error(ni, wh->i_addr2,
1945                             IEEE80211_FC0_SUBTYPE_DEAUTH,
1946                             IEEE80211_REASON_ASSOC_NOT_AUTHED);
1947                         vap->iv_stats.is_rx_assoc_notauth++;
1948                         return;
1949                 }
1950
1951                 /*
1952                  * asreq frame format
1953                  *      [2] capability information
1954                  *      [2] listen interval
1955                  *      [6*] current AP address (reassoc only)
1956                  *      [tlv] ssid
1957                  *      [tlv] supported rates
1958                  *      [tlv] extended supported rates
1959                  *      [tlv] WPA or RSN
1960                  *      [tlv] HT capabilities
1961                  *      [tlv] Atheros capabilities
1962                  */
1963                 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
1964                 capinfo = le16toh(*(uint16_t *)frm);    frm += 2;
1965                 lintval = le16toh(*(uint16_t *)frm);    frm += 2;
1966                 if (reassoc)
1967                         frm += 6;       /* ignore current AP info */
1968                 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
1969                 sfrm = frm;
1970                 while (efrm - frm > 1) {
1971                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1972                         switch (*frm) {
1973                         case IEEE80211_ELEMID_SSID:
1974                                 ssid = frm;
1975                                 break;
1976                         case IEEE80211_ELEMID_RATES:
1977                                 rates = frm;
1978                                 break;
1979                         case IEEE80211_ELEMID_XRATES:
1980                                 xrates = frm;
1981                                 break;
1982                         case IEEE80211_ELEMID_RSN:
1983                                 rsn = frm;
1984                                 break;
1985                         case IEEE80211_ELEMID_HTCAP:
1986                                 htcap = frm;
1987                                 break;
1988                         case IEEE80211_ELEMID_VENDOR:
1989                                 if (iswpaoui(frm))
1990                                         wpa = frm;
1991                                 else if (iswmeinfo(frm))
1992                                         wme = frm;
1993 #ifdef IEEE80211_SUPPORT_SUPERG
1994                                 else if (isatherosoui(frm))
1995                                         ath = frm;
1996 #endif
1997                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1998                                         if (ishtcapoui(frm) && htcap == NULL)
1999                                                 htcap = frm;
2000                                 }
2001                                 break;
2002                         }
2003                         frm += frm[1] + 2;
2004                 }
2005                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2006                 if (xrates != NULL)
2007                         IEEE80211_VERIFY_ELEMENT(xrates,
2008                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
2009                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2010                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2011                 if (htcap != NULL) {
2012                         IEEE80211_VERIFY_LENGTH(htcap[1],
2013                              htcap[0] == IEEE80211_ELEMID_VENDOR ?
2014                                  4 + sizeof(struct ieee80211_ie_htcap)-2 :
2015                                  sizeof(struct ieee80211_ie_htcap)-2,
2016                              return);           /* XXX just NULL out? */
2017                 }
2018
2019                 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2020                     !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2021                         return;
2022                 /* discard challenge after association */
2023                 if (ni->ni_challenge != NULL) {
2024                         free(ni->ni_challenge, M_80211_NODE);
2025                         ni->ni_challenge = NULL;
2026                 }
2027                 /* NB: 802.11 spec says to ignore station's privacy bit */
2028                 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2029                         capinfomismatch(ni, wh, reassoc, resp,
2030                             "capability", capinfo);
2031                         return;
2032                 }
2033                 /*
2034                  * Disallow re-associate w/ invalid slot time setting.
2035                  */
2036                 if (ni->ni_associd != 0 &&
2037                     IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2038                     ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2039                         capinfomismatch(ni, wh, reassoc, resp,
2040                             "slot time", capinfo);
2041                         return;
2042                 }
2043                 rate = ieee80211_setup_rates(ni, rates, xrates,
2044                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2045                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2046                 if (rate & IEEE80211_RATE_BASIC) {
2047                         ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2048                         vap->iv_stats.is_rx_assoc_norate++;
2049                         return;
2050                 }
2051                 /*
2052                  * If constrained to 11g-only stations reject an
2053                  * 11b-only station.  We cheat a bit here by looking
2054                  * at the max negotiated xmit rate and assuming anyone
2055                  * with a best rate <24Mb/s is an 11b station.
2056                  */
2057                 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2058                         ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2059                         vap->iv_stats.is_rx_assoc_norate++;
2060                         return;
2061                 }
2062                 /*
2063                  * Do HT rate set handling and setup HT node state.
2064                  */
2065                 ni->ni_chan = vap->iv_bss->ni_chan;
2066                 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2067                         rate = ieee80211_setup_htrates(ni, htcap,
2068                                 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2069                                 IEEE80211_F_DOBRS);
2070                         if (rate & IEEE80211_RATE_BASIC) {
2071                                 ratesetmismatch(ni, wh, reassoc, resp,
2072                                     "HT", rate);
2073                                 vap->iv_stats.is_ht_assoc_norate++;
2074                                 return;
2075                         }
2076                         ieee80211_ht_node_init(ni);
2077                         ieee80211_ht_updatehtcap(ni, htcap);
2078                 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2079                         ieee80211_ht_node_cleanup(ni);
2080 #ifdef IEEE80211_SUPPORT_SUPERG
2081                 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
2082                         ieee80211_ff_node_cleanup(ni);
2083 #endif
2084                 /*
2085                  * Allow AMPDU operation only with unencrypted traffic
2086                  * or AES-CCM; the 11n spec only specifies these ciphers
2087                  * so permitting any others is undefined and can lead
2088                  * to interoperability problems.
2089                  */
2090                 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2091                     (((vap->iv_flags & IEEE80211_F_WPA) &&
2092                       rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2093                      (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2094                         IEEE80211_NOTE(vap,
2095                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2096                             "disallow HT use because WEP or TKIP requested, "
2097                             "capinfo 0x%x ucastcipher %d", capinfo,
2098                             rsnparms.rsn_ucastcipher);
2099                         ieee80211_ht_node_cleanup(ni);
2100                         vap->iv_stats.is_ht_assoc_downgrade++;
2101                 }
2102                 /*
2103                  * If constrained to 11n-only stations reject legacy stations.
2104                  */
2105                 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2106                     (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2107                         htcapmismatch(ni, wh, reassoc, resp);
2108                         vap->iv_stats.is_ht_assoc_nohtcap++;
2109                         return;
2110                 }
2111                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2112                 ni->ni_noise = nf;
2113                 ni->ni_intval = lintval;
2114                 ni->ni_capinfo = capinfo;
2115                 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2116                 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2117                 /*
2118                  * Store the IEs.
2119                  * XXX maybe better to just expand
2120                  */
2121                 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2122 #define setie(_ie, _off)        ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2123                         if (wpa != NULL)
2124                                 setie(wpa_ie, wpa - sfrm);
2125                         if (rsn != NULL)
2126                                 setie(rsn_ie, rsn - sfrm);
2127                         if (htcap != NULL)
2128                                 setie(htcap_ie, htcap - sfrm);
2129                         if (wme != NULL) {
2130                                 setie(wme_ie, wme - sfrm);
2131                                 /*
2132                                  * Mark node as capable of QoS.
2133                                  */
2134                                 ni->ni_flags |= IEEE80211_NODE_QOS;
2135                         } else
2136                                 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2137 #ifdef IEEE80211_SUPPORT_SUPERG
2138                         if (ath != NULL) {
2139                                 setie(ath_ie, ath - sfrm);
2140                                 /* 
2141                                  * Parse ATH station parameters.
2142                                  */
2143                                 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2144                         } else
2145 #endif
2146                                 ni->ni_ath_flags = 0;
2147 #undef setie
2148                 } else {
2149                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
2150                         ni->ni_ath_flags = 0;
2151                 }
2152                 ieee80211_node_join(ni, resp);
2153                 ieee80211_deliver_l2uf(ni);
2154                 break;
2155         }
2156
2157         case IEEE80211_FC0_SUBTYPE_DEAUTH:
2158         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2159                 uint16_t reason;
2160
2161                 if (vap->iv_state != IEEE80211_S_RUN ||
2162                     /* NB: can happen when in promiscuous mode */
2163                     !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2164                         vap->iv_stats.is_rx_mgtdiscard++;
2165                         break;
2166                 }
2167                 /*
2168                  * deauth/disassoc frame format
2169                  *      [2] reason
2170                  */
2171                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2172                 reason = le16toh(*(uint16_t *)frm);
2173                 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2174                         vap->iv_stats.is_rx_deauth++;
2175                         IEEE80211_NODE_STAT(ni, rx_deauth);
2176                 } else {
2177                         vap->iv_stats.is_rx_disassoc++;
2178                         IEEE80211_NODE_STAT(ni, rx_disassoc);
2179                 }
2180                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2181                     "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >>
2182                         IEEE80211_FC0_SUBTYPE_SHIFT], reason);
2183                 if (ni != vap->iv_bss)
2184                         ieee80211_node_leave(ni);
2185                 break;
2186         }
2187
2188         case IEEE80211_FC0_SUBTYPE_ACTION:
2189                 if (vap->iv_state == IEEE80211_S_RUN) {
2190                         if (ieee80211_parse_action(ni, m0) == 0)
2191                                 ic->ic_recv_action(ni, wh, frm, efrm);
2192                 } else
2193                         vap->iv_stats.is_rx_mgtdiscard++;
2194                 break;
2195
2196         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2197         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2198         default:
2199                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2200                      wh, "mgt", "subtype 0x%x not handled", subtype);
2201                 vap->iv_stats.is_rx_badsubtype++;
2202                 break;
2203         }
2204 }
2205
2206 static void
2207 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2208 {
2209         switch (subtype) {
2210         case IEEE80211_FC0_SUBTYPE_PS_POLL:
2211                 hostap_recv_pspoll(ni, m);
2212                 break;
2213         case IEEE80211_FC0_SUBTYPE_BAR:
2214                 ieee80211_recv_bar(ni, m);
2215                 break;
2216         }
2217 }
2218
2219 /*
2220  * Process a received ps-poll frame.
2221  */
2222 static void
2223 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2224 {
2225         struct ieee80211vap *vap = ni->ni_vap;
2226         struct ieee80211_frame_min *wh;
2227         struct ifnet *ifp;
2228         struct mbuf *m;
2229         uint16_t aid;
2230         int qlen;
2231
2232         wh = mtod(m0, struct ieee80211_frame_min *);
2233         if (ni->ni_associd == 0) {
2234                 IEEE80211_DISCARD(vap,
2235                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2236                     (struct ieee80211_frame *) wh, NULL,
2237                     "%s", "unassociated station");
2238                 vap->iv_stats.is_ps_unassoc++;
2239                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2240                         IEEE80211_REASON_NOT_ASSOCED);
2241                 return;
2242         }
2243
2244         aid = le16toh(*(uint16_t *)wh->i_dur);
2245         if (aid != ni->ni_associd) {
2246                 IEEE80211_DISCARD(vap,
2247                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2248                     (struct ieee80211_frame *) wh, NULL,
2249                     "aid mismatch: sta aid 0x%x poll aid 0x%x",
2250                     ni->ni_associd, aid);
2251                 vap->iv_stats.is_ps_badaid++;
2252                 /*
2253                  * NB: We used to deauth the station but it turns out
2254                  * the Blackberry Curve 8230 (and perhaps other devices) 
2255                  * sometimes send the wrong AID when WME is negotiated.
2256                  * Being more lenient here seems ok as we already check
2257                  * the station is associated and we only return frames
2258                  * queued for the station (i.e. we don't use the AID).
2259                  */
2260                 return;
2261         }
2262
2263         /* Okay, take the first queued packet and put it out... */
2264         m = ieee80211_node_psq_dequeue(ni, &qlen);
2265         if (m == NULL) {
2266                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2267                     "%s", "recv ps-poll, but queue empty");
2268                 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2269                 vap->iv_stats.is_ps_qempty++;   /* XXX node stat */
2270                 if (vap->iv_set_tim != NULL)
2271                         vap->iv_set_tim(ni, 0); /* just in case */
2272                 return;
2273         }
2274         /* 
2275          * If there are more packets, set the more packets bit
2276          * in the packet dispatched to the station; otherwise
2277          * turn off the TIM bit.
2278          */
2279         if (qlen != 0) {
2280                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2281                     "recv ps-poll, send packet, %u still queued", qlen);
2282                 m->m_flags |= M_MORE_DATA;
2283         } else {
2284                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2285                     "%s", "recv ps-poll, send packet, queue empty");
2286                 if (vap->iv_set_tim != NULL)
2287                         vap->iv_set_tim(ni, 0);
2288         }
2289         m->m_flags |= M_PWR_SAV;                /* bypass PS handling */
2290
2291         if (m->m_flags & M_ENCAP)
2292                 ifp = vap->iv_ic->ic_ifp;
2293         else
2294                 ifp = vap->iv_ifp;
2295         IF_ENQUEUE(&ifp->if_snd, m);
2296         if_start(ifp);
2297 }