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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 WDS 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_wds.h>
59 #include <net80211/ieee80211_input.h>
60 #ifdef IEEE80211_SUPPORT_SUPERG
61 #include <net80211/ieee80211_superg.h>
62 #endif
63
64 static void wds_vattach(struct ieee80211vap *);
65 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
66 static  int wds_input(struct ieee80211_node *ni, struct mbuf *m, int, int);
67 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *,
68             int subtype, int, int);
69
70 void
71 ieee80211_wds_attach(struct ieee80211com *ic)
72 {
73         ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
74 }
75
76 void
77 ieee80211_wds_detach(struct ieee80211com *ic)
78 {
79 }
80
81 static void
82 wds_vdetach(struct ieee80211vap *vap)
83 {
84         if (vap->iv_bss != NULL) {
85                 /* XXX locking? */
86                 if (vap->iv_bss->ni_wdsvap == vap)
87                         vap->iv_bss->ni_wdsvap = NULL;
88         }
89 }
90
91 static void
92 wds_vattach(struct ieee80211vap *vap)
93 {
94         vap->iv_newstate = wds_newstate;
95         vap->iv_input = wds_input;
96         vap->iv_recv_mgmt = wds_recv_mgmt;
97         vap->iv_opdetach = wds_vdetach;
98 }
99
100 static void
101 wds_flush(struct ieee80211_node *ni)
102 {
103         struct ieee80211com *ic = ni->ni_ic;
104         struct mbuf *m, *next;
105         int8_t rssi, nf;
106
107         m = ieee80211_ageq_remove(&ic->ic_stageq,
108             (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
109         if (m == NULL)
110                 return;
111
112         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
113             "%s", "flush wds queue");
114         ic->ic_node_getsignal(ni, &rssi, &nf);
115         for (; m != NULL; m = next) {
116                 next = m->m_nextpkt;
117                 m->m_nextpkt = NULL;
118                 ieee80211_input(ni, m, rssi, nf);
119         }
120 }
121
122 static int
123 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
124 {
125         struct ieee80211com *ic = vap->iv_ic;
126         struct ieee80211_node_table *nt = &ic->ic_sta;
127         struct ieee80211_node *ni, *obss;
128
129         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
130              "%s: creating link to %s on channel %u\n", __func__,
131              ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan));
132
133         /* NB: vap create must specify the bssid for the link */
134         KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
135         /* NB: we should only be called on RUN transition */
136         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));
137
138         if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
139                 /*
140                  * Dynamic/non-legacy WDS.  Reference the associated
141                  * station specified by the desired bssid setup at vap
142                  * create.  Point ni_wdsvap at the WDS vap so 4-address
143                  * frames received through the associated AP vap will
144                  * be dispatched upward (e.g. to a bridge) as though
145                  * they arrived on the WDS vap.
146                  */
147                 IEEE80211_NODE_LOCK(nt);
148                 obss = NULL;
149                 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
150                 if (ni == NULL) {
151                         /*
152                          * Node went away before we could hookup.  This
153                          * should be ok; no traffic will flow and a leave
154                          * event will be dispatched that should cause
155                          * the vap to be destroyed.
156                          */
157                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
158                             "%s: station %s went away\n",
159                             __func__, ether_sprintf(vap->iv_des_bssid));
160                         /* XXX stat? */
161                 } else if (ni->ni_wdsvap != NULL) {
162                         /*
163                          * Node already setup with a WDS vap; we cannot
164                          * allow multiple references so disallow.  If
165                          * ni_wdsvap points at us that's ok; we should
166                          * do nothing anyway.
167                          */
168                         /* XXX printf instead? */
169                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
170                             "%s: station %s in use with %s\n",
171                             __func__, ether_sprintf(vap->iv_des_bssid),
172                             ni->ni_wdsvap->iv_ifp->if_xname);
173                         /* XXX stat? */
174                 } else {
175                         /*
176                          * Committed to new node, setup state.
177                          */
178                         obss = vap->iv_bss;
179                         vap->iv_bss = ni;
180                         ni->ni_wdsvap = vap;
181                 }
182                 IEEE80211_NODE_UNLOCK(nt);
183                 if (obss != NULL) {
184                         /* NB: deferred to avoid recursive lock */
185                         ieee80211_free_node(obss);
186                 }
187         } else {
188                 /*
189                  * Legacy WDS vap setup.
190                  */
191                 /*
192                  * The far end does not associate so we just create
193                  * create a new node and install it as the vap's
194                  * bss node.  We must simulate an association and
195                  * authorize the port for traffic to flow.
196                  * XXX check if node already in sta table?
197                  */
198                 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
199                 if (ni != NULL) {
200                         obss = vap->iv_bss;
201                         vap->iv_bss = ieee80211_ref_node(ni);
202                         ni->ni_flags |= IEEE80211_NODE_AREF;
203                         if (obss != NULL)
204                                 ieee80211_free_node(obss);
205                         /* give driver a chance to setup state like ni_txrate */
206                         if (ic->ic_newassoc != NULL)
207                                 ic->ic_newassoc(ni, 1);
208                         /* tell the authenticator about new station */
209                         if (vap->iv_auth->ia_node_join != NULL)
210                                 vap->iv_auth->ia_node_join(ni);
211                         if (ni->ni_authmode != IEEE80211_AUTH_8021X)
212                                 ieee80211_node_authorize(ni);
213
214                         ieee80211_notify_node_join(ni, 1 /*newassoc*/);
215                         /* XXX inject l2uf frame */
216                 }
217         }
218
219         /*
220          * Flush any pending frames now that were setup.
221          */
222         if (ni != NULL)
223                 wds_flush(ni);
224         return (ni == NULL ? ENOENT : 0);
225 }
226
227 /*
228  * Propagate multicast frames of an ap vap to all DWDS links.
229  * The caller is assumed to have verified this frame is multicast.
230  */
231 void
232 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
233 {
234         struct ieee80211com *ic = vap0->iv_ic;
235         struct ifnet *parent = ic->ic_ifp;
236         const struct ether_header *eh = mtod(m, const struct ether_header *);
237         struct ieee80211_node *ni;
238         struct ieee80211vap *vap;
239         struct ifnet *ifp;
240         struct mbuf *mcopy;
241         int err;
242
243         KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
244             ("%s not mcast", ether_sprintf(eh->ether_dhost)));
245
246         /* XXX locking */
247         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
248                 /* only DWDS vaps are interesting */
249                 if (vap->iv_opmode != IEEE80211_M_WDS ||
250                     (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
251                         continue;
252                 /* if it came in this interface, don't send it back out */
253                 ifp = vap->iv_ifp;
254                 if (ifp == m->m_pkthdr.rcvif)
255                         continue;
256                 /*
257                  * Duplicate the frame and send it.
258                  */
259                 mcopy = m_copypacket(m, M_DONTWAIT);
260                 if (mcopy == NULL) {
261                         ifp->if_oerrors++;
262                         /* XXX stat + msg */
263                         continue;
264                 }
265                 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
266                 if (ni == NULL) {
267                         /* NB: ieee80211_find_txnode does stat+msg */
268                         ifp->if_oerrors++;
269                         m_freem(mcopy);
270                         continue;
271                 }
272                 /* calculate priority so drivers can find the tx queue */
273                 if (ieee80211_classify(ni, mcopy)) {
274                         IEEE80211_DISCARD_MAC(vap,
275                             IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
276                             eh->ether_dhost, NULL,
277                             "%s", "classification failure");
278                         vap->iv_stats.is_tx_classify++;
279                         ifp->if_oerrors++;
280                         m_freem(mcopy);
281                         ieee80211_free_node(ni);
282                         continue;
283                 }
284
285                 BPF_MTAP(ifp, m);               /* 802.3 tx */
286
287                 /*
288                  * Encapsulate the packet in prep for transmission.
289                  */
290                 mcopy = ieee80211_encap(vap, ni, mcopy);
291                 if (mcopy == NULL) {
292                         /* NB: stat+msg handled in ieee80211_encap */
293                         ieee80211_free_node(ni);
294                         continue;
295                 }
296                 mcopy->m_flags |= M_MCAST;
297                 mcopy->m_pkthdr.rcvif = (void *) ni;
298
299                 err = parent->if_transmit(parent, mcopy);
300                 if (err) {
301                         /* NB: IFQ_HANDOFF reclaims mbuf */
302                         ifp->if_oerrors++;
303                         ieee80211_free_node(ni);
304                 } else
305                         ifp->if_opackets++;
306         }
307 }
308
309 /*
310  * Handle DWDS discovery on receipt of a 4-address frame in
311  * ap mode.  Queue the frame and post an event for someone
312  * to plumb the necessary WDS vap for this station.  Frames
313  * received prior to the vap set running will then be reprocessed
314  * as if they were just received.
315  */
316 void
317 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
318 {
319         struct ieee80211com *ic = ni->ni_ic;
320
321         /*
322          * Save the frame with an aging interval 4 times
323          * the listen interval specified by the station. 
324          * Frames that sit around too long are reclaimed
325          * using this information.
326          * XXX handle overflow?
327          * XXX per/vap beacon interval?
328          */
329         m->m_pkthdr.rcvif = (void *)(uintptr_t)
330             ieee80211_mac_hash(ic, ni->ni_macaddr);
331         (void) ieee80211_ageq_append(&ic->ic_stageq, m,
332             ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
333         ieee80211_notify_wds_discover(ni);
334 }
335
336 /*
337  * IEEE80211_M_WDS vap state machine handler.
338  */
339 static int
340 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
341 {
342         struct ieee80211com *ic = vap->iv_ic;
343         struct ieee80211_node *ni;
344         enum ieee80211_state ostate;
345         int error;
346
347         IEEE80211_LOCK_ASSERT(ic);
348
349         ostate = vap->iv_state;
350         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
351                 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
352         vap->iv_state = nstate;                 /* state transition */
353         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
354         if (ostate != IEEE80211_S_SCAN)
355                 ieee80211_cancel_scan(vap);     /* background scan */
356         ni = vap->iv_bss;                       /* NB: no reference held */
357         error = 0;
358         switch (nstate) {
359         case IEEE80211_S_INIT:
360                 switch (ostate) {
361                 case IEEE80211_S_SCAN:
362                         ieee80211_cancel_scan(vap);
363                         break;
364                 default:
365                         break;
366                 }
367                 if (ostate != IEEE80211_S_INIT) {
368                         /* NB: optimize INIT -> INIT case */
369                         ieee80211_reset_bss(vap);
370                 }
371                 break;
372         case IEEE80211_S_SCAN:
373                 switch (ostate) {
374                 case IEEE80211_S_INIT:
375                         ieee80211_check_scan_current(vap);
376                         break;
377                 default:
378                         break;
379                 }
380                 break;
381         case IEEE80211_S_RUN:
382                 if (ostate == IEEE80211_S_INIT) {
383                         /*
384                          * Already have a channel; bypass the scan
385                          * and startup immediately.
386                          */
387                         error = ieee80211_create_wds(vap, ic->ic_curchan);
388                 }
389                 break;
390         default:
391                 break;
392         }
393         return error;
394 }
395
396 /*
397  * Process a received frame.  The node associated with the sender
398  * should be supplied.  If nothing was found in the node table then
399  * the caller is assumed to supply a reference to iv_bss instead.
400  * The RSSI and a timestamp are also supplied.  The RSSI data is used
401  * during AP scanning to select a AP to associate with; it can have
402  * any units so long as values have consistent units and higher values
403  * mean ``better signal''.  The receive timestamp is currently not used
404  * by the 802.11 layer.
405  */
406 static int
407 wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
408 {
409 #define HAS_SEQ(type)   ((type & 0x4) == 0)
410         struct ieee80211vap *vap = ni->ni_vap;
411         struct ieee80211com *ic = ni->ni_ic;
412         struct ifnet *ifp = vap->iv_ifp;
413         struct ieee80211_frame *wh;
414         struct ieee80211_key *key;
415         struct ether_header *eh;
416         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
417         uint8_t dir, type, subtype, qos;
418         uint16_t rxseq;
419
420         if (m->m_flags & M_AMPDU_MPDU) {
421                 /*
422                  * Fastpath for A-MPDU reorder q resubmission.  Frames
423                  * w/ M_AMPDU_MPDU marked have already passed through
424                  * here but were received out of order and been held on
425                  * the reorder queue.  When resubmitted they are marked
426                  * with the M_AMPDU_MPDU flag and we can bypass most of
427                  * the normal processing.
428                  */
429                 wh = mtod(m, struct ieee80211_frame *);
430                 type = IEEE80211_FC0_TYPE_DATA;
431                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
432                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
433                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
434                 goto resubmit_ampdu;
435         }
436
437         KASSERT(ni != NULL, ("null node"));
438
439         type = -1;                      /* undefined */
440
441         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
442                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
443                     ni->ni_macaddr, NULL,
444                     "too short (1): len %u", m->m_pkthdr.len);
445                 vap->iv_stats.is_rx_tooshort++;
446                 goto out;
447         }
448         /*
449          * Bit of a cheat here, we use a pointer for a 3-address
450          * frame format but don't reference fields past outside
451          * ieee80211_frame_min w/o first validating the data is
452          * present.
453          */
454         wh = mtod(m, struct ieee80211_frame *);
455
456         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
457                 ni->ni_inact = ni->ni_inact_reload;
458
459         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
460             IEEE80211_FC0_VERSION_0) {
461                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
462                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
463                     wh->i_fc[0], wh->i_fc[1]);
464                 vap->iv_stats.is_rx_badversion++;
465                 goto err;
466         }
467
468         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
469         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
470         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
471
472         /* NB: WDS vap's do not scan */
473         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
474                 IEEE80211_DISCARD_MAC(vap,
475                     IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
476                     "too short (3): len %u", m->m_pkthdr.len);
477                 vap->iv_stats.is_rx_tooshort++;
478                 goto out;
479         }
480         /* NB: the TA is implicitly verified by finding the wds peer node */
481         if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
482             !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
483                 /* not interested in */
484                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
485                     wh->i_addr1, NULL, "%s", "not to bss");
486                 vap->iv_stats.is_rx_wrongbss++;
487                 goto out;
488         }
489         IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
490         ni->ni_noise = nf;
491         if (HAS_SEQ(type)) {
492                 uint8_t tid = ieee80211_gettid(wh);
493                 if (IEEE80211_QOS_HAS_SEQ(wh) &&
494                     TID_TO_WME_AC(tid) >= WME_AC_VI)
495                         ic->ic_wme.wme_hipri_traffic++;
496                 rxseq = le16toh(*(uint16_t *)wh->i_seq);
497                 if (! ieee80211_check_rxseq(ni, wh)) {
498                         /* duplicate, discard */
499                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
500                             wh->i_addr1, "duplicate",
501                             "seqno <%u,%u> fragno <%u,%u> tid %u",
502                             rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
503                             ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT,
504                             rxseq & IEEE80211_SEQ_FRAG_MASK,
505                             ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK,
506                             tid);
507                         vap->iv_stats.is_rx_dup++;
508                         IEEE80211_NODE_STAT(ni, rx_dup);
509                         goto out;
510                 }
511                 ni->ni_rxseqs[tid] = rxseq;
512         }
513         switch (type) {
514         case IEEE80211_FC0_TYPE_DATA:
515                 hdrspace = ieee80211_hdrspace(ic, wh);
516                 if (m->m_len < hdrspace &&
517                     (m = m_pullup(m, hdrspace)) == NULL) {
518                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
519                             ni->ni_macaddr, NULL,
520                             "data too short: expecting %u", hdrspace);
521                         vap->iv_stats.is_rx_tooshort++;
522                         goto out;               /* XXX */
523                 }
524                 if (dir != IEEE80211_FC1_DIR_DSTODS) {
525                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
526                             wh, "data", "incorrect dir 0x%x", dir);
527                         vap->iv_stats.is_rx_wrongdir++;
528                         goto out;
529                 }
530                 /*
531                  * Only legacy WDS traffic should take this path.
532                  */
533                 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
534                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
535                             wh, "data", "%s", "not legacy wds");
536                         vap->iv_stats.is_rx_wrongdir++;/*XXX*/
537                         goto out;
538                 }
539                 /*
540                  * Handle A-MPDU re-ordering.  If the frame is to be
541                  * processed directly then ieee80211_ampdu_reorder
542                  * will return 0; otherwise it has consumed the mbuf
543                  * and we should do nothing more with it.
544                  */
545                 if ((m->m_flags & M_AMPDU) &&
546                     ieee80211_ampdu_reorder(ni, m) != 0) {
547                         m = NULL;
548                         goto out;
549                 }
550         resubmit_ampdu:
551
552                 /*
553                  * Handle privacy requirements.  Note that we
554                  * must not be preempted from here until after
555                  * we (potentially) call ieee80211_crypto_demic;
556                  * otherwise we may violate assumptions in the
557                  * crypto cipher modules used to do delayed update
558                  * of replay sequence numbers.
559                  */
560                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
561                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
562                                 /*
563                                  * Discard encrypted frames when privacy is off.
564                                  */
565                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
566                                     wh, "WEP", "%s", "PRIVACY off");
567                                 vap->iv_stats.is_rx_noprivacy++;
568                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
569                                 goto out;
570                         }
571                         key = ieee80211_crypto_decap(ni, m, hdrspace);
572                         if (key == NULL) {
573                                 /* NB: stats+msgs handled in crypto_decap */
574                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
575                                 goto out;
576                         }
577                         wh = mtod(m, struct ieee80211_frame *);
578                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
579                 } else {
580                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
581                         key = NULL;
582                 }
583
584                 /*
585                  * Save QoS bits for use below--before we strip the header.
586                  */
587                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
588                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
589                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
590                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
591                 } else
592                         qos = 0;
593
594                 /*
595                  * Next up, any fragmentation.
596                  */
597                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
598                         m = ieee80211_defrag(ni, m, hdrspace);
599                         if (m == NULL) {
600                                 /* Fragment dropped or frame not complete yet */
601                                 goto out;
602                         }
603                 }
604                 wh = NULL;              /* no longer valid, catch any uses */
605
606                 /*
607                  * Next strip any MSDU crypto bits.
608                  */
609                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
610                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
611                             ni->ni_macaddr, "data", "%s", "demic error");
612                         vap->iv_stats.is_rx_demicfail++;
613                         IEEE80211_NODE_STAT(ni, rx_demicfail);
614                         goto out;
615                 }
616
617                 /* copy to listener after decrypt */
618                 if (ieee80211_radiotap_active_vap(vap))
619                         ieee80211_radiotap_rx(vap, m);
620                 need_tap = 0;
621
622                 /*
623                  * Finally, strip the 802.11 header.
624                  */
625                 m = ieee80211_decap(vap, m, hdrspace);
626                 if (m == NULL) {
627                         /* XXX mask bit to check for both */
628                         /* don't count Null data frames as errors */
629                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
630                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
631                                 goto out;
632                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
633                             ni->ni_macaddr, "data", "%s", "decap error");
634                         vap->iv_stats.is_rx_decap++;
635                         IEEE80211_NODE_STAT(ni, rx_decap);
636                         goto err;
637                 }
638                 eh = mtod(m, struct ether_header *);
639                 if (!ieee80211_node_is_authorized(ni)) {
640                         /*
641                          * Deny any non-PAE frames received prior to
642                          * authorization.  For open/shared-key
643                          * authentication the port is mark authorized
644                          * after authentication completes.  For 802.1x
645                          * the port is not marked authorized by the
646                          * authenticator until the handshake has completed.
647                          */
648                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
649                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
650                                     eh->ether_shost, "data",
651                                     "unauthorized port: ether type 0x%x len %u",
652                                     eh->ether_type, m->m_pkthdr.len);
653                                 vap->iv_stats.is_rx_unauth++;
654                                 IEEE80211_NODE_STAT(ni, rx_unauth);
655                                 goto err;
656                         }
657                 } else {
658                         /*
659                          * When denying unencrypted frames, discard
660                          * any non-PAE frames received without encryption.
661                          */
662                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
663                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
664                             eh->ether_type != htons(ETHERTYPE_PAE)) {
665                                 /*
666                                  * Drop unencrypted frames.
667                                  */
668                                 vap->iv_stats.is_rx_unencrypted++;
669                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
670                                 goto out;
671                         }
672                 }
673                 /* XXX require HT? */
674                 if (qos & IEEE80211_QOS_AMSDU) {
675                         m = ieee80211_decap_amsdu(ni, m);
676                         if (m == NULL)
677                                 return IEEE80211_FC0_TYPE_DATA;
678                 } else {
679 #ifdef IEEE80211_SUPPORT_SUPERG
680                         m = ieee80211_decap_fastframe(vap, ni, m);
681                         if (m == NULL)
682                                 return IEEE80211_FC0_TYPE_DATA;
683 #endif
684                 }
685                 ieee80211_deliver_data(vap, ni, m);
686                 return IEEE80211_FC0_TYPE_DATA;
687
688         case IEEE80211_FC0_TYPE_MGT:
689                 vap->iv_stats.is_rx_mgmt++;
690                 IEEE80211_NODE_STAT(ni, rx_mgmt);
691                 if (dir != IEEE80211_FC1_DIR_NODS) {
692                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
693                             wh, "data", "incorrect dir 0x%x", dir);
694                         vap->iv_stats.is_rx_wrongdir++;
695                         goto err;
696                 }
697                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
698                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
699                             ni->ni_macaddr, "mgt", "too short: len %u",
700                             m->m_pkthdr.len);
701                         vap->iv_stats.is_rx_tooshort++;
702                         goto out;
703                 }
704 #ifdef IEEE80211_DEBUG
705                 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
706                         if_printf(ifp, "received %s from %s rssi %d\n",
707                             ieee80211_mgt_subtype_name[subtype >>
708                                 IEEE80211_FC0_SUBTYPE_SHIFT],
709                             ether_sprintf(wh->i_addr2), rssi);
710                 }
711 #endif
712                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
713                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
714                             wh, NULL, "%s", "WEP set but not permitted");
715                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
716                         goto out;
717                 }
718                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
719                 goto out;
720
721         case IEEE80211_FC0_TYPE_CTL:
722                 vap->iv_stats.is_rx_ctl++;
723                 IEEE80211_NODE_STAT(ni, rx_ctrl);
724                 goto out;
725
726         default:
727                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
728                     wh, "bad", "frame type 0x%x", type);
729                 /* should not come here */
730                 break;
731         }
732 err:
733         ifp->if_ierrors++;
734 out:
735         if (m != NULL) {
736                 if (need_tap && ieee80211_radiotap_active_vap(vap))
737                         ieee80211_radiotap_rx(vap, m);
738                 m_freem(m);
739         }
740         return type;
741 }
742
743 static void
744 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
745         int subtype, int rssi, int nf)
746 {
747         struct ieee80211vap *vap = ni->ni_vap;
748         struct ieee80211com *ic = ni->ni_ic;
749         struct ieee80211_frame *wh;
750         u_int8_t *frm, *efrm;
751
752         wh = mtod(m0, struct ieee80211_frame *);
753         frm = (u_int8_t *)&wh[1];
754         efrm = mtod(m0, u_int8_t *) + m0->m_len;
755         switch (subtype) {
756         case IEEE80211_FC0_SUBTYPE_ACTION:
757         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
758                 if (ni == vap->iv_bss) {
759                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
760                             wh, NULL, "%s", "unknown node");
761                         vap->iv_stats.is_rx_mgtdiscard++;
762                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
763                         /* NB: not interested in multicast frames. */
764                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
765                             wh, NULL, "%s", "not for us");
766                         vap->iv_stats.is_rx_mgtdiscard++;
767                 } else if (vap->iv_state != IEEE80211_S_RUN) {
768                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
769                             wh, NULL, "wrong state %s",
770                             ieee80211_state_name[vap->iv_state]);
771                         vap->iv_stats.is_rx_mgtdiscard++;
772                 } else {
773                         if (ieee80211_parse_action(ni, m0) == 0)
774                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
775                 }
776                 break;
777
778         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
779         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
780         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
781         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
782         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
783         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
784         case IEEE80211_FC0_SUBTYPE_BEACON:
785         case IEEE80211_FC0_SUBTYPE_ATIM:
786         case IEEE80211_FC0_SUBTYPE_DISASSOC:
787         case IEEE80211_FC0_SUBTYPE_AUTH:
788         case IEEE80211_FC0_SUBTYPE_DEAUTH:
789                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
790                     wh, NULL, "%s", "not handled");
791                 vap->iv_stats.is_rx_mgtdiscard++;
792                 break;
793
794         default:
795                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
796                     wh, "mgt", "subtype 0x%x not handled", subtype);
797                 vap->iv_stats.is_rx_badsubtype++;
798                 break;
799         }
800 }