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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         const struct ether_header *eh = mtod(m, const struct ether_header *);
236         struct ieee80211_node *ni;
237         struct ieee80211vap *vap;
238         struct ifnet *ifp;
239         struct mbuf *mcopy;
240         int err;
241
242         KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
243             ("%s not mcast", ether_sprintf(eh->ether_dhost)));
244
245         /* XXX locking */
246         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
247                 /* only DWDS vaps are interesting */
248                 if (vap->iv_opmode != IEEE80211_M_WDS ||
249                     (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
250                         continue;
251                 /* if it came in this interface, don't send it back out */
252                 ifp = vap->iv_ifp;
253                 if (ifp == m->m_pkthdr.rcvif)
254                         continue;
255                 /*
256                  * Duplicate the frame and send it.
257                  */
258                 mcopy = m_copypacket(m, M_NOWAIT);
259                 if (mcopy == NULL) {
260                         ifp->if_oerrors++;
261                         /* XXX stat + msg */
262                         continue;
263                 }
264                 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
265                 if (ni == NULL) {
266                         /* NB: ieee80211_find_txnode does stat+msg */
267                         ifp->if_oerrors++;
268                         m_freem(mcopy);
269                         continue;
270                 }
271                 /* calculate priority so drivers can find the tx queue */
272                 if (ieee80211_classify(ni, mcopy)) {
273                         IEEE80211_DISCARD_MAC(vap,
274                             IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
275                             eh->ether_dhost, NULL,
276                             "%s", "classification failure");
277                         vap->iv_stats.is_tx_classify++;
278                         ifp->if_oerrors++;
279                         m_freem(mcopy);
280                         ieee80211_free_node(ni);
281                         continue;
282                 }
283
284                 BPF_MTAP(ifp, m);               /* 802.3 tx */
285
286                 /*
287                  * Encapsulate the packet in prep for transmission.
288                  */
289                 mcopy = ieee80211_encap(vap, ni, mcopy);
290                 if (mcopy == NULL) {
291                         /* NB: stat+msg handled in ieee80211_encap */
292                         ieee80211_free_node(ni);
293                         continue;
294                 }
295                 mcopy->m_flags |= M_MCAST;
296                 mcopy->m_pkthdr.rcvif = (void *) ni;
297
298                 err = ieee80211_parent_xmitpkt(ic, mcopy);
299                 if (err) {
300                         /* NB: IFQ_HANDOFF reclaims mbuf */
301                         ifp->if_oerrors++;
302                         ieee80211_free_node(ni);
303                 } else
304                         ifp->if_opackets++;
305         }
306 }
307
308 /*
309  * Handle DWDS discovery on receipt of a 4-address frame in
310  * ap mode.  Queue the frame and post an event for someone
311  * to plumb the necessary WDS vap for this station.  Frames
312  * received prior to the vap set running will then be reprocessed
313  * as if they were just received.
314  */
315 void
316 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
317 {
318         struct ieee80211com *ic = ni->ni_ic;
319
320         /*
321          * Save the frame with an aging interval 4 times
322          * the listen interval specified by the station. 
323          * Frames that sit around too long are reclaimed
324          * using this information.
325          * XXX handle overflow?
326          * XXX per/vap beacon interval?
327          */
328         m->m_pkthdr.rcvif = (void *)(uintptr_t)
329             ieee80211_mac_hash(ic, ni->ni_macaddr);
330         (void) ieee80211_ageq_append(&ic->ic_stageq, m,
331             ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
332         ieee80211_notify_wds_discover(ni);
333 }
334
335 /*
336  * IEEE80211_M_WDS vap state machine handler.
337  */
338 static int
339 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
340 {
341         struct ieee80211com *ic = vap->iv_ic;
342         struct ieee80211_node *ni;
343         enum ieee80211_state ostate;
344         int error;
345
346         IEEE80211_LOCK_ASSERT(ic);
347
348         ostate = vap->iv_state;
349         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
350                 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
351         vap->iv_state = nstate;                 /* state transition */
352         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
353         if (ostate != IEEE80211_S_SCAN)
354                 ieee80211_cancel_scan(vap);     /* background scan */
355         ni = vap->iv_bss;                       /* NB: no reference held */
356         error = 0;
357         switch (nstate) {
358         case IEEE80211_S_INIT:
359                 switch (ostate) {
360                 case IEEE80211_S_SCAN:
361                         ieee80211_cancel_scan(vap);
362                         break;
363                 default:
364                         break;
365                 }
366                 if (ostate != IEEE80211_S_INIT) {
367                         /* NB: optimize INIT -> INIT case */
368                         ieee80211_reset_bss(vap);
369                 }
370                 break;
371         case IEEE80211_S_SCAN:
372                 switch (ostate) {
373                 case IEEE80211_S_INIT:
374                         ieee80211_check_scan_current(vap);
375                         break;
376                 default:
377                         break;
378                 }
379                 break;
380         case IEEE80211_S_RUN:
381                 if (ostate == IEEE80211_S_INIT) {
382                         /*
383                          * Already have a channel; bypass the scan
384                          * and startup immediately.
385                          */
386                         error = ieee80211_create_wds(vap, ic->ic_curchan);
387                 }
388                 break;
389         default:
390                 break;
391         }
392         return error;
393 }
394
395 /*
396  * Process a received frame.  The node associated with the sender
397  * should be supplied.  If nothing was found in the node table then
398  * the caller is assumed to supply a reference to iv_bss instead.
399  * The RSSI and a timestamp are also supplied.  The RSSI data is used
400  * during AP scanning to select a AP to associate with; it can have
401  * any units so long as values have consistent units and higher values
402  * mean ``better signal''.  The receive timestamp is currently not used
403  * by the 802.11 layer.
404  */
405 static int
406 wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
407 {
408 #define HAS_SEQ(type)   ((type & 0x4) == 0)
409         struct ieee80211vap *vap = ni->ni_vap;
410         struct ieee80211com *ic = ni->ni_ic;
411         struct ifnet *ifp = vap->iv_ifp;
412         struct ieee80211_frame *wh;
413         struct ieee80211_key *key;
414         struct ether_header *eh;
415         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
416         uint8_t dir, type, subtype, qos;
417         uint16_t rxseq;
418
419         if (m->m_flags & M_AMPDU_MPDU) {
420                 /*
421                  * Fastpath for A-MPDU reorder q resubmission.  Frames
422                  * w/ M_AMPDU_MPDU marked have already passed through
423                  * here but were received out of order and been held on
424                  * the reorder queue.  When resubmitted they are marked
425                  * with the M_AMPDU_MPDU flag and we can bypass most of
426                  * the normal processing.
427                  */
428                 wh = mtod(m, struct ieee80211_frame *);
429                 type = IEEE80211_FC0_TYPE_DATA;
430                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
431                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
432                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
433                 goto resubmit_ampdu;
434         }
435
436         KASSERT(ni != NULL, ("null node"));
437
438         type = -1;                      /* undefined */
439
440         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
441                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
442                     ni->ni_macaddr, NULL,
443                     "too short (1): len %u", m->m_pkthdr.len);
444                 vap->iv_stats.is_rx_tooshort++;
445                 goto out;
446         }
447         /*
448          * Bit of a cheat here, we use a pointer for a 3-address
449          * frame format but don't reference fields past outside
450          * ieee80211_frame_min w/o first validating the data is
451          * present.
452          */
453         wh = mtod(m, struct ieee80211_frame *);
454
455         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
456                 ni->ni_inact = ni->ni_inact_reload;
457
458         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
459             IEEE80211_FC0_VERSION_0) {
460                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
461                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
462                     wh->i_fc[0], wh->i_fc[1]);
463                 vap->iv_stats.is_rx_badversion++;
464                 goto err;
465         }
466
467         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
468         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
469         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
470
471         /* NB: WDS vap's do not scan */
472         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
473                 IEEE80211_DISCARD_MAC(vap,
474                     IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
475                     "too short (3): len %u", m->m_pkthdr.len);
476                 vap->iv_stats.is_rx_tooshort++;
477                 goto out;
478         }
479         /* NB: the TA is implicitly verified by finding the wds peer node */
480         if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
481             !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
482                 /* not interested in */
483                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
484                     wh->i_addr1, NULL, "%s", "not to bss");
485                 vap->iv_stats.is_rx_wrongbss++;
486                 goto out;
487         }
488         IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
489         ni->ni_noise = nf;
490         if (HAS_SEQ(type)) {
491                 uint8_t tid = ieee80211_gettid(wh);
492                 if (IEEE80211_QOS_HAS_SEQ(wh) &&
493                     TID_TO_WME_AC(tid) >= WME_AC_VI)
494                         ic->ic_wme.wme_hipri_traffic++;
495                 rxseq = le16toh(*(uint16_t *)wh->i_seq);
496                 if (! ieee80211_check_rxseq(ni, wh)) {
497                         /* duplicate, discard */
498                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
499                             wh->i_addr1, "duplicate",
500                             "seqno <%u,%u> fragno <%u,%u> tid %u",
501                             rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
502                             ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT,
503                             rxseq & IEEE80211_SEQ_FRAG_MASK,
504                             ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK,
505                             tid);
506                         vap->iv_stats.is_rx_dup++;
507                         IEEE80211_NODE_STAT(ni, rx_dup);
508                         goto out;
509                 }
510                 ni->ni_rxseqs[tid] = rxseq;
511         }
512         switch (type) {
513         case IEEE80211_FC0_TYPE_DATA:
514                 hdrspace = ieee80211_hdrspace(ic, wh);
515                 if (m->m_len < hdrspace &&
516                     (m = m_pullup(m, hdrspace)) == NULL) {
517                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
518                             ni->ni_macaddr, NULL,
519                             "data too short: expecting %u", hdrspace);
520                         vap->iv_stats.is_rx_tooshort++;
521                         goto out;               /* XXX */
522                 }
523                 if (dir != IEEE80211_FC1_DIR_DSTODS) {
524                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
525                             wh, "data", "incorrect dir 0x%x", dir);
526                         vap->iv_stats.is_rx_wrongdir++;
527                         goto out;
528                 }
529                 /*
530                  * Only legacy WDS traffic should take this path.
531                  */
532                 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
533                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
534                             wh, "data", "%s", "not legacy wds");
535                         vap->iv_stats.is_rx_wrongdir++;/*XXX*/
536                         goto out;
537                 }
538                 /*
539                  * Handle A-MPDU re-ordering.  If the frame is to be
540                  * processed directly then ieee80211_ampdu_reorder
541                  * will return 0; otherwise it has consumed the mbuf
542                  * and we should do nothing more with it.
543                  */
544                 if ((m->m_flags & M_AMPDU) &&
545                     ieee80211_ampdu_reorder(ni, m) != 0) {
546                         m = NULL;
547                         goto out;
548                 }
549         resubmit_ampdu:
550
551                 /*
552                  * Handle privacy requirements.  Note that we
553                  * must not be preempted from here until after
554                  * we (potentially) call ieee80211_crypto_demic;
555                  * otherwise we may violate assumptions in the
556                  * crypto cipher modules used to do delayed update
557                  * of replay sequence numbers.
558                  */
559                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
560                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
561                                 /*
562                                  * Discard encrypted frames when privacy is off.
563                                  */
564                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
565                                     wh, "WEP", "%s", "PRIVACY off");
566                                 vap->iv_stats.is_rx_noprivacy++;
567                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
568                                 goto out;
569                         }
570                         key = ieee80211_crypto_decap(ni, m, hdrspace);
571                         if (key == NULL) {
572                                 /* NB: stats+msgs handled in crypto_decap */
573                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
574                                 goto out;
575                         }
576                         wh = mtod(m, struct ieee80211_frame *);
577                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
578                 } else {
579                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
580                         key = NULL;
581                 }
582
583                 /*
584                  * Save QoS bits for use below--before we strip the header.
585                  */
586                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
587                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
588                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
589                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
590                 } else
591                         qos = 0;
592
593                 /*
594                  * Next up, any fragmentation.
595                  */
596                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
597                         m = ieee80211_defrag(ni, m, hdrspace);
598                         if (m == NULL) {
599                                 /* Fragment dropped or frame not complete yet */
600                                 goto out;
601                         }
602                 }
603                 wh = NULL;              /* no longer valid, catch any uses */
604
605                 /*
606                  * Next strip any MSDU crypto bits.
607                  */
608                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
609                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
610                             ni->ni_macaddr, "data", "%s", "demic error");
611                         vap->iv_stats.is_rx_demicfail++;
612                         IEEE80211_NODE_STAT(ni, rx_demicfail);
613                         goto out;
614                 }
615
616                 /* copy to listener after decrypt */
617                 if (ieee80211_radiotap_active_vap(vap))
618                         ieee80211_radiotap_rx(vap, m);
619                 need_tap = 0;
620
621                 /*
622                  * Finally, strip the 802.11 header.
623                  */
624                 m = ieee80211_decap(vap, m, hdrspace);
625                 if (m == NULL) {
626                         /* XXX mask bit to check for both */
627                         /* don't count Null data frames as errors */
628                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
629                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
630                                 goto out;
631                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
632                             ni->ni_macaddr, "data", "%s", "decap error");
633                         vap->iv_stats.is_rx_decap++;
634                         IEEE80211_NODE_STAT(ni, rx_decap);
635                         goto err;
636                 }
637                 eh = mtod(m, struct ether_header *);
638                 if (!ieee80211_node_is_authorized(ni)) {
639                         /*
640                          * Deny any non-PAE frames received prior to
641                          * authorization.  For open/shared-key
642                          * authentication the port is mark authorized
643                          * after authentication completes.  For 802.1x
644                          * the port is not marked authorized by the
645                          * authenticator until the handshake has completed.
646                          */
647                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
648                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
649                                     eh->ether_shost, "data",
650                                     "unauthorized port: ether type 0x%x len %u",
651                                     eh->ether_type, m->m_pkthdr.len);
652                                 vap->iv_stats.is_rx_unauth++;
653                                 IEEE80211_NODE_STAT(ni, rx_unauth);
654                                 goto err;
655                         }
656                 } else {
657                         /*
658                          * When denying unencrypted frames, discard
659                          * any non-PAE frames received without encryption.
660                          */
661                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
662                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
663                             eh->ether_type != htons(ETHERTYPE_PAE)) {
664                                 /*
665                                  * Drop unencrypted frames.
666                                  */
667                                 vap->iv_stats.is_rx_unencrypted++;
668                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
669                                 goto out;
670                         }
671                 }
672                 /* XXX require HT? */
673                 if (qos & IEEE80211_QOS_AMSDU) {
674                         m = ieee80211_decap_amsdu(ni, m);
675                         if (m == NULL)
676                                 return IEEE80211_FC0_TYPE_DATA;
677                 } else {
678 #ifdef IEEE80211_SUPPORT_SUPERG
679                         m = ieee80211_decap_fastframe(vap, ni, m);
680                         if (m == NULL)
681                                 return IEEE80211_FC0_TYPE_DATA;
682 #endif
683                 }
684                 ieee80211_deliver_data(vap, ni, m);
685                 return IEEE80211_FC0_TYPE_DATA;
686
687         case IEEE80211_FC0_TYPE_MGT:
688                 vap->iv_stats.is_rx_mgmt++;
689                 IEEE80211_NODE_STAT(ni, rx_mgmt);
690                 if (dir != IEEE80211_FC1_DIR_NODS) {
691                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
692                             wh, "data", "incorrect dir 0x%x", dir);
693                         vap->iv_stats.is_rx_wrongdir++;
694                         goto err;
695                 }
696                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
697                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
698                             ni->ni_macaddr, "mgt", "too short: len %u",
699                             m->m_pkthdr.len);
700                         vap->iv_stats.is_rx_tooshort++;
701                         goto out;
702                 }
703 #ifdef IEEE80211_DEBUG
704                 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
705                         if_printf(ifp, "received %s from %s rssi %d\n",
706                             ieee80211_mgt_subtype_name[subtype >>
707                                 IEEE80211_FC0_SUBTYPE_SHIFT],
708                             ether_sprintf(wh->i_addr2), rssi);
709                 }
710 #endif
711                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
712                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
713                             wh, NULL, "%s", "WEP set but not permitted");
714                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
715                         goto out;
716                 }
717                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
718                 goto out;
719
720         case IEEE80211_FC0_TYPE_CTL:
721                 vap->iv_stats.is_rx_ctl++;
722                 IEEE80211_NODE_STAT(ni, rx_ctrl);
723                 goto out;
724
725         default:
726                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
727                     wh, "bad", "frame type 0x%x", type);
728                 /* should not come here */
729                 break;
730         }
731 err:
732         ifp->if_ierrors++;
733 out:
734         if (m != NULL) {
735                 if (need_tap && ieee80211_radiotap_active_vap(vap))
736                         ieee80211_radiotap_rx(vap, m);
737                 m_freem(m);
738         }
739         return type;
740 }
741
742 static void
743 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
744         int subtype, int rssi, int nf)
745 {
746         struct ieee80211vap *vap = ni->ni_vap;
747         struct ieee80211com *ic = ni->ni_ic;
748         struct ieee80211_frame *wh;
749         u_int8_t *frm, *efrm;
750
751         wh = mtod(m0, struct ieee80211_frame *);
752         frm = (u_int8_t *)&wh[1];
753         efrm = mtod(m0, u_int8_t *) + m0->m_len;
754         switch (subtype) {
755         case IEEE80211_FC0_SUBTYPE_ACTION:
756         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
757                 if (ni == vap->iv_bss) {
758                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
759                             wh, NULL, "%s", "unknown node");
760                         vap->iv_stats.is_rx_mgtdiscard++;
761                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
762                         /* NB: not interested in multicast frames. */
763                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
764                             wh, NULL, "%s", "not for us");
765                         vap->iv_stats.is_rx_mgtdiscard++;
766                 } else if (vap->iv_state != IEEE80211_S_RUN) {
767                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
768                             wh, NULL, "wrong state %s",
769                             ieee80211_state_name[vap->iv_state]);
770                         vap->iv_stats.is_rx_mgtdiscard++;
771                 } else {
772                         if (ieee80211_parse_action(ni, m0) == 0)
773                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
774                 }
775                 break;
776
777         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
778         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
779         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
780         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
781         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
782         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
783         case IEEE80211_FC0_SUBTYPE_BEACON:
784         case IEEE80211_FC0_SUBTYPE_ATIM:
785         case IEEE80211_FC0_SUBTYPE_DISASSOC:
786         case IEEE80211_FC0_SUBTYPE_AUTH:
787         case IEEE80211_FC0_SUBTYPE_DEAUTH:
788                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
789                     wh, NULL, "%s", "not handled");
790                 vap->iv_stats.is_rx_mgtdiscard++;
791                 break;
792
793         default:
794                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
795                     wh, "mgt", "subtype 0x%x not handled", subtype);
796                 vap->iv_stats.is_rx_badsubtype++;
797                 break;
798         }
799 }