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net80211: reject mixed plaintext/encrypted fragments
[FreeBSD/FreeBSD.git] / sys / net80211 / ieee80211_input.c
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2001 Atsushi Onoe
5  * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include "opt_wlan.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/mbuf.h>   
37 #include <sys/malloc.h>
38 #include <sys/endian.h>
39 #include <sys/kernel.h>
40
41 #include <sys/socket.h>
42
43 #include <net/ethernet.h>
44 #include <net/if.h>
45 #include <net/if_var.h>
46 #include <net/if_llc.h>
47 #include <net/if_media.h>
48 #include <net/if_vlan_var.h>
49
50 #include <net80211/ieee80211_var.h>
51 #include <net80211/ieee80211_input.h>
52 #ifdef IEEE80211_SUPPORT_MESH
53 #include <net80211/ieee80211_mesh.h>
54 #endif
55
56 #include <net/bpf.h>
57
58 #ifdef INET
59 #include <netinet/in.h>
60 #include <net/ethernet.h>
61 #endif
62
63 static void
64 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx)
65 {
66         int i;
67
68         /* Verify the required MIMO bits are set */
69         if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) !=
70             (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI))
71                 return;
72
73         /* XXX This assumes the MIMO radios have both ctl and ext chains */
74         for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
75                 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]);
76                 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]);
77         }
78
79         /* XXX This also assumes the MIMO radios have both ctl and ext chains */
80         for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
81                 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i];
82                 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i];
83         }
84         ni->ni_mimo_chains = rx->c_chain;
85 }
86
87 int
88 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m)
89 {
90         struct ieee80211_rx_stats rxs;
91
92         /* try to read stats from mbuf */
93         bzero(&rxs, sizeof(rxs));
94         if (ieee80211_get_rx_params(m, &rxs) != 0)
95                 return (-1);
96
97         /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */
98         ieee80211_process_mimo(ni, &rxs);
99
100         //return ieee80211_input(ni, m, rx->rssi, rx->nf);
101         return ni->ni_vap->iv_input(ni, m, &rxs, rxs.c_rssi, rxs.c_nf);
102 }
103
104 int
105 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf)
106 {
107         struct ieee80211_rx_stats rx;
108
109         rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI;
110         rx.c_nf = nf;
111         rx.c_rssi = rssi;
112
113         if (!ieee80211_add_rx_params(m, &rx))
114                 return (-1);
115
116         return ieee80211_input_mimo_all(ic, m);
117 }
118
119 int
120 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m)
121 {
122         struct ieee80211vap *vap;
123         int type = -1;
124
125         m->m_flags |= M_BCAST;          /* NB: mark for bpf tap'ing */
126
127         /* XXX locking */
128         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
129                 struct ieee80211_node *ni;
130                 struct mbuf *mcopy;
131
132                 /* NB: could check for IFF_UP but this is cheaper */
133                 if (vap->iv_state == IEEE80211_S_INIT)
134                         continue;
135                 /*
136                  * WDS vap's only receive directed traffic from the
137                  * station at the ``far end''.  That traffic should
138                  * be passed through the AP vap the station is associated
139                  * to--so don't spam them with mcast frames.
140                  */
141                 if (vap->iv_opmode == IEEE80211_M_WDS)
142                         continue;
143                 if (TAILQ_NEXT(vap, iv_next) != NULL) {
144                         /*
145                          * Packet contents are changed by ieee80211_decap
146                          * so do a deep copy of the packet.
147                          * NB: tags are copied too.
148                          */
149                         mcopy = m_dup(m, M_NOWAIT);
150                         if (mcopy == NULL) {
151                                 /* XXX stat+msg */
152                                 continue;
153                         }
154                 } else {
155                         mcopy = m;
156                         m = NULL;
157                 }
158                 ni = ieee80211_ref_node(vap->iv_bss);
159                 type = ieee80211_input_mimo(ni, mcopy);
160                 ieee80211_free_node(ni);
161         }
162         if (m != NULL)                  /* no vaps, reclaim mbuf */
163                 m_freem(m);
164         return type;
165 }
166
167 /*
168  * This function reassembles fragments.
169  *
170  * XXX should handle 3 concurrent reassemblies per-spec.
171  */
172 struct mbuf *
173 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace,
174         int has_decrypted)
175 {
176         struct ieee80211vap *vap = ni->ni_vap;
177         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
178         struct ieee80211_frame *lwh;
179         uint16_t rxseq;
180         uint8_t fragno;
181         uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
182         struct mbuf *mfrag;
183
184         KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
185
186         rxseq = le16toh(*(uint16_t *)wh->i_seq);
187         fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
188
189         /* Quick way out, if there's nothing to defragment */
190         if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
191                 return m;
192
193         /* Temporarily set flag to remember if fragment was encrypted. */
194         /* XXX use a non-packet altering storage for this in the future. */
195         if (has_decrypted)
196                 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED;
197
198         /*
199          * Remove frag to insure it doesn't get reaped by timer.
200          */
201         if (ni->ni_table == NULL) {
202                 /*
203                  * Should never happen.  If the node is orphaned (not in
204                  * the table) then input packets should not reach here.
205                  * Otherwise, a concurrent request that yanks the table
206                  * should be blocked by other interlocking and/or by first
207                  * shutting the driver down.  Regardless, be defensive
208                  * here and just bail
209                  */
210                 /* XXX need msg+stat */
211                 m_freem(m);
212                 return NULL;
213         }
214         IEEE80211_NODE_LOCK(ni->ni_table);
215         mfrag = ni->ni_rxfrag[0];
216         ni->ni_rxfrag[0] = NULL;
217         IEEE80211_NODE_UNLOCK(ni->ni_table);
218
219         /*
220          * Validate new fragment is in order and
221          * related to the previous ones.
222          */
223         if (mfrag != NULL) {
224                 uint16_t last_rxseq;
225
226                 lwh = mtod(mfrag, struct ieee80211_frame *);
227                 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq);
228                 /*
229                  * NB: check seq # and frag together. Also check that both
230                  * fragments are plaintext or that both are encrypted.
231                  */
232                 if (rxseq == last_rxseq+1 &&
233                     IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) &&
234                     IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2) &&
235                     !((wh->i_fc[1] ^ lwh->i_fc[1]) & IEEE80211_FC1_PROTECTED)) {
236                         /* XXX clear MORE_FRAG bit? */
237                         /* track last seqnum and fragno */
238                         *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq;
239
240                         m_adj(m, hdrspace);             /* strip header */
241                         m_catpkt(mfrag, m);             /* concatenate */
242                 } else {
243                         /*
244                          * Unrelated fragment or no space for it,
245                          * clear current fragments.
246                          */
247                         m_freem(mfrag);
248                         mfrag = NULL;
249                 }
250         }
251
252         if (mfrag == NULL) {
253                 if (fragno != 0) {              /* !first fragment, discard */
254                         vap->iv_stats.is_rx_defrag++;
255                         IEEE80211_NODE_STAT(ni, rx_defrag);
256                         m_freem(m);
257                         return NULL;
258                 }
259                 mfrag = m;
260         }
261         if (more_frag) {                        /* more to come, save */
262                 ni->ni_rxfragstamp = ticks;
263                 ni->ni_rxfrag[0] = mfrag;
264                 mfrag = NULL;
265         }
266         /* Remember to clear protected flag that was temporarily set. */
267         if (mfrag != NULL) {
268                 wh = mtod(mfrag, struct ieee80211_frame *);
269                 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
270         }
271         return mfrag;
272 }
273
274 void
275 ieee80211_deliver_data(struct ieee80211vap *vap,
276         struct ieee80211_node *ni, struct mbuf *m)
277 {
278         struct ether_header *eh = mtod(m, struct ether_header *);
279         struct ifnet *ifp = vap->iv_ifp;
280
281         /* clear driver/net80211 flags before passing up */
282         m->m_flags &= ~(M_MCAST | M_BCAST);
283         m_clrprotoflags(m);
284
285         /* NB: see hostap_deliver_data, this path doesn't handle hostap */
286         KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap"));
287         /*
288          * Do accounting.
289          */
290         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
291         IEEE80211_NODE_STAT(ni, rx_data);
292         IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
293         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
294                 if (ETHER_IS_BROADCAST(eh->ether_dhost))
295                         m->m_flags |= M_BCAST;
296                 else
297                         m->m_flags |= M_MCAST;
298                 IEEE80211_NODE_STAT(ni, rx_mcast);
299         } else
300                 IEEE80211_NODE_STAT(ni, rx_ucast);
301         m->m_pkthdr.rcvif = ifp;
302
303         if (ni->ni_vlan != 0) {
304                 /* attach vlan tag */
305                 m->m_pkthdr.ether_vtag = ni->ni_vlan;
306                 m->m_flags |= M_VLANTAG;
307         }
308         ifp->if_input(ifp, m);
309 }
310
311 struct mbuf *
312 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen)
313 {
314         struct ieee80211_qosframe_addr4 wh;
315         struct ether_header *eh;
316         struct llc *llc;
317
318         KASSERT(hdrlen <= sizeof(wh),
319             ("hdrlen %d > max %zd", hdrlen, sizeof(wh)));
320
321         if (m->m_len < hdrlen + sizeof(*llc) &&
322             (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
323                 vap->iv_stats.is_rx_tooshort++;
324                 /* XXX msg */
325                 return NULL;
326         }
327         memcpy(&wh, mtod(m, caddr_t), hdrlen);
328         llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
329         if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
330             llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
331             llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
332             /* NB: preserve AppleTalk frames that have a native SNAP hdr */
333             !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
334               llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
335                 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
336                 llc = NULL;
337         } else {
338                 m_adj(m, hdrlen - sizeof(*eh));
339         }
340         eh = mtod(m, struct ether_header *);
341         switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
342         case IEEE80211_FC1_DIR_NODS:
343                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
344                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
345                 break;
346         case IEEE80211_FC1_DIR_TODS:
347                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
348                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
349                 break;
350         case IEEE80211_FC1_DIR_FROMDS:
351                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
352                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
353                 break;
354         case IEEE80211_FC1_DIR_DSTODS:
355                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
356                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
357                 break;
358         }
359 #ifndef __NO_STRICT_ALIGNMENT
360         if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
361                 m = ieee80211_realign(vap, m, sizeof(*eh));
362                 if (m == NULL)
363                         return NULL;
364         }
365 #endif /* !__NO_STRICT_ALIGNMENT */
366         if (llc != NULL) {
367                 eh = mtod(m, struct ether_header *);
368                 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
369         }
370         return m;
371 }
372
373 /*
374  * Decap a frame encapsulated in a fast-frame/A-MSDU.
375  */
376 struct mbuf *
377 ieee80211_decap1(struct mbuf *m, int *framelen)
378 {
379 #define FF_LLC_SIZE     (sizeof(struct ether_header) + sizeof(struct llc))
380         struct ether_header *eh;
381         struct llc *llc;
382
383         /*
384          * The frame has an 802.3 header followed by an 802.2
385          * LLC header.  The encapsulated frame length is in the
386          * first header type field; save that and overwrite it 
387          * with the true type field found in the second.  Then
388          * copy the 802.3 header up to where it belongs and
389          * adjust the mbuf contents to remove the void.
390          */
391         if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
392                 return NULL;
393         eh = mtod(m, struct ether_header *);    /* 802.3 header is first */
394         llc = (struct llc *)&eh[1];             /* 802.2 header follows */
395         *framelen = ntohs(eh->ether_type)       /* encap'd frame size */
396                   + sizeof(struct ether_header) - sizeof(struct llc);
397         eh->ether_type = llc->llc_un.type_snap.ether_type;
398         ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
399                 sizeof(struct ether_header));
400         m_adj(m, sizeof(struct llc));
401         return m;
402 #undef FF_LLC_SIZE
403 }
404
405 /*
406  * Install received rate set information in the node's state block.
407  */
408 int
409 ieee80211_setup_rates(struct ieee80211_node *ni,
410         const uint8_t *rates, const uint8_t *xrates, int flags)
411 {
412         struct ieee80211vap *vap = ni->ni_vap;
413         struct ieee80211_rateset *rs = &ni->ni_rates;
414
415         memset(rs, 0, sizeof(*rs));
416         rs->rs_nrates = rates[1];
417         memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
418         if (xrates != NULL) {
419                 uint8_t nxrates;
420                 /*
421                  * Tack on 11g extended supported rate element.
422                  */
423                 nxrates = xrates[1];
424                 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
425                         nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
426                         IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
427                             "extended rate set too large; only using "
428                             "%u of %u rates", nxrates, xrates[1]);
429                         vap->iv_stats.is_rx_rstoobig++;
430                 }
431                 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
432                 rs->rs_nrates += nxrates;
433         }
434         return ieee80211_fix_rate(ni, rs, flags);
435 }
436
437 /*
438  * Send a management frame error response to the specified
439  * station.  If ni is associated with the station then use
440  * it; otherwise allocate a temporary node suitable for
441  * transmitting the frame and then free the reference so
442  * it will go away as soon as the frame has been transmitted.
443  */
444 void
445 ieee80211_send_error(struct ieee80211_node *ni,
446         const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
447 {
448         struct ieee80211vap *vap = ni->ni_vap;
449         int istmp;
450
451         if (ni == vap->iv_bss) {
452                 if (vap->iv_state != IEEE80211_S_RUN) {
453                         /*
454                          * XXX hack until we get rid of this routine.
455                          * We can be called prior to the vap reaching
456                          * run state under certain conditions in which
457                          * case iv_bss->ni_chan will not be setup.
458                          * Check for this explicitly and and just ignore
459                          * the request.
460                          */
461                         return;
462                 }
463                 ni = ieee80211_tmp_node(vap, mac);
464                 if (ni == NULL) {
465                         /* XXX msg */
466                         return;
467                 }
468                 istmp = 1;
469         } else
470                 istmp = 0;
471         IEEE80211_SEND_MGMT(ni, subtype, arg);
472         if (istmp)
473                 ieee80211_free_node(ni);
474 }
475
476 int
477 ieee80211_alloc_challenge(struct ieee80211_node *ni)
478 {
479         if (ni->ni_challenge == NULL)
480                 ni->ni_challenge = (uint32_t *)
481                     IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN,
482                       M_80211_NODE, IEEE80211_M_NOWAIT);
483         if (ni->ni_challenge == NULL) {
484                 IEEE80211_NOTE(ni->ni_vap,
485                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
486                     "%s", "shared key challenge alloc failed");
487                 /* XXX statistic */
488         }
489         return (ni->ni_challenge != NULL);
490 }
491
492 /*
493  * Parse a Beacon or ProbeResponse frame and return the
494  * useful information in an ieee80211_scanparams structure.
495  * Status is set to 0 if no problems were found; otherwise
496  * a bitmask of IEEE80211_BPARSE_* items is returned that
497  * describes the problems detected.
498  */
499 int
500 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
501         struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan)
502 {
503         struct ieee80211vap *vap = ni->ni_vap;
504         struct ieee80211com *ic = ni->ni_ic;
505         struct ieee80211_frame *wh;
506         uint8_t *frm, *efrm;
507
508         wh = mtod(m, struct ieee80211_frame *);
509         frm = (uint8_t *)&wh[1];
510         efrm = mtod(m, uint8_t *) + m->m_len;
511         scan->status = 0;
512         /*
513          * beacon/probe response frame format
514          *
515          * XXX Update from 802.11-2012 - eg where HT is
516          *      [8] time stamp
517          *      [2] beacon interval
518          *      [2] capability information
519          *      [tlv] ssid
520          *      [tlv] supported rates
521          *      [tlv] country information
522          *      [tlv] channel switch announcement (CSA)
523          *      [tlv] parameter set (FH/DS)
524          *      [tlv] erp information
525          *      [tlv] extended supported rates
526          *      [tlv] WME
527          *      [tlv] WPA or RSN
528          *      [tlv] HT capabilities
529          *      [tlv] HT information
530          *      [tlv] VHT capabilities
531          *      [tlv] VHT information
532          *      [tlv] Atheros capabilities
533          *      [tlv] Mesh ID
534          *      [tlv] Mesh Configuration
535          */
536         IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
537             return (scan->status = IEEE80211_BPARSE_BADIELEN));
538         memset(scan, 0, sizeof(*scan));
539         scan->tstamp  = frm;                            frm += 8;
540         scan->bintval = le16toh(*(uint16_t *)frm);      frm += 2;
541         scan->capinfo = le16toh(*(uint16_t *)frm);      frm += 2;
542         scan->bchan = ieee80211_chan2ieee(ic, rxchan);
543         scan->chan = scan->bchan;
544         scan->ies = frm;
545         scan->ies_len = efrm - frm;
546
547         while (efrm - frm > 1) {
548                 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
549                     return (scan->status = IEEE80211_BPARSE_BADIELEN));
550                 switch (*frm) {
551                 case IEEE80211_ELEMID_SSID:
552                         scan->ssid = frm;
553                         break;
554                 case IEEE80211_ELEMID_RATES:
555                         scan->rates = frm;
556                         break;
557                 case IEEE80211_ELEMID_COUNTRY:
558                         scan->country = frm;
559                         break;
560                 case IEEE80211_ELEMID_CSA:
561                         scan->csa = frm;
562                         break;
563                 case IEEE80211_ELEMID_QUIET:
564                         scan->quiet = frm;
565                         break;
566                 case IEEE80211_ELEMID_FHPARMS:
567                         if (ic->ic_phytype == IEEE80211_T_FH) {
568                                 scan->fhdwell = le16dec(&frm[2]);
569                                 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
570                                 scan->fhindex = frm[6];
571                         }
572                         break;
573                 case IEEE80211_ELEMID_DSPARMS:
574                         /*
575                          * XXX hack this since depending on phytype
576                          * is problematic for multi-mode devices.
577                          */
578                         if (ic->ic_phytype != IEEE80211_T_FH)
579                                 scan->chan = frm[2];
580                         break;
581                 case IEEE80211_ELEMID_TIM:
582                         /* XXX ATIM? */
583                         scan->tim = frm;
584                         scan->timoff = frm - mtod(m, uint8_t *);
585                         break;
586                 case IEEE80211_ELEMID_IBSSPARMS:
587                 case IEEE80211_ELEMID_CFPARMS:
588                 case IEEE80211_ELEMID_PWRCNSTR:
589                 case IEEE80211_ELEMID_BSSLOAD:
590                 case IEEE80211_ELEMID_APCHANREP:
591                         /* NB: avoid debugging complaints */
592                         break;
593                 case IEEE80211_ELEMID_XRATES:
594                         scan->xrates = frm;
595                         break;
596                 case IEEE80211_ELEMID_ERP:
597                         if (frm[1] != 1) {
598                                 IEEE80211_DISCARD_IE(vap,
599                                     IEEE80211_MSG_ELEMID, wh, "ERP",
600                                     "bad len %u", frm[1]);
601                                 vap->iv_stats.is_rx_elem_toobig++;
602                                 break;
603                         }
604                         scan->erp = frm[2] | 0x100;
605                         break;
606                 case IEEE80211_ELEMID_HTCAP:
607                         scan->htcap = frm;
608                         break;
609                 case IEEE80211_ELEMID_VHT_CAP:
610                         scan->vhtcap = frm;
611                         break;
612                 case IEEE80211_ELEMID_VHT_OPMODE:
613                         scan->vhtopmode = frm;
614                         break;
615                 case IEEE80211_ELEMID_RSN:
616                         scan->rsn = frm;
617                         break;
618                 case IEEE80211_ELEMID_HTINFO:
619                         scan->htinfo = frm;
620                         break;
621 #ifdef IEEE80211_SUPPORT_MESH
622                 case IEEE80211_ELEMID_MESHID:
623                         scan->meshid = frm;
624                         break;
625                 case IEEE80211_ELEMID_MESHCONF:
626                         scan->meshconf = frm;
627                         break;
628 #endif
629                 /* Extended capabilities; nothing handles it for now */
630                 case IEEE80211_ELEMID_EXTCAP:
631                         break;
632                 case IEEE80211_ELEMID_VENDOR:
633                         if (iswpaoui(frm))
634                                 scan->wpa = frm;
635                         else if (iswmeparam(frm) || iswmeinfo(frm))
636                                 scan->wme = frm;
637 #ifdef IEEE80211_SUPPORT_SUPERG
638                         else if (isatherosoui(frm))
639                                 scan->ath = frm;
640 #endif
641 #ifdef IEEE80211_SUPPORT_TDMA
642                         else if (istdmaoui(frm))
643                                 scan->tdma = frm;
644 #endif
645                         else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
646                                 /*
647                                  * Accept pre-draft HT ie's if the
648                                  * standard ones have not been seen.
649                                  */
650                                 if (ishtcapoui(frm)) {
651                                         if (scan->htcap == NULL)
652                                                 scan->htcap = frm;
653                                 } else if (ishtinfooui(frm)) {
654                                         if (scan->htinfo == NULL)
655                                                 scan->htcap = frm;
656                                 }
657                         }
658                         break;
659                 default:
660                         IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
661                             wh, "unhandled",
662                             "id %u, len %u", *frm, frm[1]);
663                         vap->iv_stats.is_rx_elem_unknown++;
664                         break;
665                 }
666                 frm += frm[1] + 2;
667         }
668         IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
669             scan->status |= IEEE80211_BPARSE_RATES_INVALID);
670         if (scan->rates != NULL && scan->xrates != NULL) {
671                 /*
672                  * NB: don't process XRATES if RATES is missing.  This
673                  * avoids a potential null ptr deref and should be ok
674                  * as the return code will already note RATES is missing
675                  * (so callers shouldn't otherwise process the frame).
676                  */
677                 IEEE80211_VERIFY_ELEMENT(scan->xrates,
678                     IEEE80211_RATE_MAXSIZE - scan->rates[1],
679                     scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
680         }
681         IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
682             scan->status |= IEEE80211_BPARSE_SSID_INVALID);
683         if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
684                 /*
685                  * Frame was received on a channel different from the
686                  * one indicated in the DS params element id;
687                  * silently discard it.
688                  *
689                  * NB: this can happen due to signal leakage.
690                  *     But we should take it for FH phy because
691                  *     the rssi value should be correct even for
692                  *     different hop pattern in FH.
693                  */
694                 IEEE80211_DISCARD(vap,
695                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
696                     wh, NULL, "for off-channel %u (bchan=%u)",
697                     scan->chan, scan->bchan);
698                 vap->iv_stats.is_rx_chanmismatch++;
699                 scan->status |= IEEE80211_BPARSE_OFFCHAN;
700         }
701         if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
702               scan->bintval <= IEEE80211_BINTVAL_MAX)) {
703                 IEEE80211_DISCARD(vap,
704                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
705                     wh, NULL, "bogus beacon interval (%d TU)",
706                     (int) scan->bintval);
707                 vap->iv_stats.is_rx_badbintval++;
708                 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
709         }
710         if (scan->country != NULL) {
711                 /*
712                  * Validate we have at least enough data to extract
713                  * the country code.  Not sure if we should return an
714                  * error instead of discarding the IE; consider this
715                  * being lenient as we don't depend on the data for
716                  * correct operation.
717                  */
718                 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
719                     scan->country = NULL);
720         }
721         if (scan->csa != NULL) {
722                 /*
723                  * Validate Channel Switch Announcement; this must
724                  * be the correct length or we toss the frame.
725                  */
726                 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t),
727                     scan->status |= IEEE80211_BPARSE_CSA_INVALID);
728         }
729         /*
730          * Process HT ie's.  This is complicated by our
731          * accepting both the standard ie's and the pre-draft
732          * vendor OUI ie's that some vendors still use/require.
733          */
734         if (scan->htcap != NULL) {
735                 IEEE80211_VERIFY_LENGTH(scan->htcap[1],
736                      scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
737                          4 + sizeof(struct ieee80211_ie_htcap)-2 :
738                          sizeof(struct ieee80211_ie_htcap)-2,
739                      scan->htcap = NULL);
740         }
741         if (scan->htinfo != NULL) {
742                 IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
743                      scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
744                          4 + sizeof(struct ieee80211_ie_htinfo)-2 :
745                          sizeof(struct ieee80211_ie_htinfo)-2,
746                      scan->htinfo = NULL);
747         }
748
749         /* Process VHT IEs */
750         if (scan->vhtcap != NULL) {
751                 IEEE80211_VERIFY_LENGTH(scan->vhtcap[1],
752                     sizeof(struct ieee80211_ie_vhtcap) - 2,
753                     scan->vhtcap = NULL);
754         }
755         if (scan->vhtopmode != NULL) {
756                 IEEE80211_VERIFY_LENGTH(scan->vhtopmode[1],
757                     sizeof(struct ieee80211_ie_vht_operation) - 2,
758                     scan->vhtopmode = NULL);
759         }
760
761         return scan->status;
762 }
763
764 /*
765  * Parse an Action frame.  Return 0 on success, non-zero on failure.
766  */
767 int
768 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
769 {
770         struct ieee80211vap *vap = ni->ni_vap;
771         const struct ieee80211_action *ia;
772         struct ieee80211_frame *wh;
773         uint8_t *frm, *efrm;
774
775         /*
776          * action frame format:
777          *      [1] category
778          *      [1] action
779          *      [tlv] parameters
780          */
781         wh = mtod(m, struct ieee80211_frame *);
782         frm = (u_int8_t *)&wh[1];
783         efrm = mtod(m, u_int8_t *) + m->m_len;
784         IEEE80211_VERIFY_LENGTH(efrm - frm,
785                 sizeof(struct ieee80211_action), return EINVAL);
786         ia = (const struct ieee80211_action *) frm;
787
788         vap->iv_stats.is_rx_action++;
789         IEEE80211_NODE_STAT(ni, rx_action);
790
791         /* verify frame payloads but defer processing */
792         switch (ia->ia_category) {
793         case IEEE80211_ACTION_CAT_BA:
794                 switch (ia->ia_action) {
795                 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
796                         IEEE80211_VERIFY_LENGTH(efrm - frm,
797                             sizeof(struct ieee80211_action_ba_addbarequest),
798                             return EINVAL);
799                         break;
800                 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
801                         IEEE80211_VERIFY_LENGTH(efrm - frm,
802                             sizeof(struct ieee80211_action_ba_addbaresponse),
803                             return EINVAL);
804                         break;
805                 case IEEE80211_ACTION_BA_DELBA:
806                         IEEE80211_VERIFY_LENGTH(efrm - frm,
807                             sizeof(struct ieee80211_action_ba_delba),
808                             return EINVAL);
809                         break;
810                 }
811                 break;
812         case IEEE80211_ACTION_CAT_HT:
813                 switch (ia->ia_action) {
814                 case IEEE80211_ACTION_HT_TXCHWIDTH:
815                         IEEE80211_VERIFY_LENGTH(efrm - frm,
816                             sizeof(struct ieee80211_action_ht_txchwidth),
817                             return EINVAL);
818                         break;
819                 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
820                         IEEE80211_VERIFY_LENGTH(efrm - frm,
821                             sizeof(struct ieee80211_action_ht_mimopowersave),
822                             return EINVAL);
823                         break;
824                 }
825                 break;
826 #ifdef IEEE80211_SUPPORT_MESH
827         case IEEE80211_ACTION_CAT_MESH:
828                 switch (ia->ia_action) {
829                 case IEEE80211_ACTION_MESH_LMETRIC:
830                         /*
831                          * XXX: verification is true only if we are using
832                          * Airtime link metric (default)
833                          */
834                         IEEE80211_VERIFY_LENGTH(efrm - frm,
835                             sizeof(struct ieee80211_meshlmetric_ie),
836                             return EINVAL);
837                         break;
838                 case IEEE80211_ACTION_MESH_HWMP:
839                         /* verify something */
840                         break;
841                 case IEEE80211_ACTION_MESH_GANN:
842                         IEEE80211_VERIFY_LENGTH(efrm - frm,
843                             sizeof(struct ieee80211_meshgann_ie),
844                             return EINVAL);
845                         break;
846                 case IEEE80211_ACTION_MESH_CC:
847                 case IEEE80211_ACTION_MESH_MCCA_SREQ:
848                 case IEEE80211_ACTION_MESH_MCCA_SREP:
849                 case IEEE80211_ACTION_MESH_MCCA_AREQ:
850                 case IEEE80211_ACTION_MESH_MCCA_ADVER:
851                 case IEEE80211_ACTION_MESH_MCCA_TRDOWN:
852                 case IEEE80211_ACTION_MESH_TBTT_REQ:
853                 case IEEE80211_ACTION_MESH_TBTT_RES:
854                         /* reject these early on, not implemented */
855                         IEEE80211_DISCARD(vap,
856                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
857                             wh, NULL, "not implemented yet, act=0x%02X",
858                             ia->ia_action);
859                         return EINVAL;
860                 }
861                 break;
862         case IEEE80211_ACTION_CAT_SELF_PROT:
863                 /* If TA or RA group address discard silently */
864                 if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
865                         IEEE80211_IS_MULTICAST(wh->i_addr2))
866                         return EINVAL;
867                 /*
868                  * XXX: Should we verify complete length now or it is
869                  * to varying in sizes?
870                  */
871                 switch (ia->ia_action) {
872                 case IEEE80211_ACTION_MESHPEERING_CONFIRM:
873                 case IEEE80211_ACTION_MESHPEERING_CLOSE:
874                         /* is not a peering candidate (yet) */
875                         if (ni == vap->iv_bss)
876                                 return EINVAL;
877                         break;
878                 }
879                 break;
880 #endif
881         case IEEE80211_ACTION_CAT_VHT:
882                 printf("%s: TODO: VHT handling!\n", __func__);
883                 break;
884         }
885         return 0;
886 }
887
888 #ifdef IEEE80211_DEBUG
889 /*
890  * Debugging support.
891  */
892 void
893 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
894         uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
895 {
896         printf("[%s] discard %s frame, ssid mismatch: ",
897                 ether_sprintf(mac), tag);
898         ieee80211_print_essid(ssid + 2, ssid[1]);
899         printf("\n");
900 }
901
902 /*
903  * Return the bssid of a frame.
904  */
905 static const uint8_t *
906 ieee80211_getbssid(const struct ieee80211vap *vap,
907         const struct ieee80211_frame *wh)
908 {
909         if (vap->iv_opmode == IEEE80211_M_STA)
910                 return wh->i_addr2;
911         if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
912                 return wh->i_addr1;
913         if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
914                 return wh->i_addr1;
915         return wh->i_addr3;
916 }
917
918 #include <machine/stdarg.h>
919
920 void
921 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...)
922 {
923         char buf[128];          /* XXX */
924         va_list ap;
925
926         va_start(ap, fmt);
927         vsnprintf(buf, sizeof(buf), fmt, ap);
928         va_end(ap);
929
930         if_printf(vap->iv_ifp, "%s", buf);      /* NB: no \n */
931 }
932
933 void
934 ieee80211_note_frame(const struct ieee80211vap *vap,
935         const struct ieee80211_frame *wh,
936         const char *fmt, ...)
937 {
938         char buf[128];          /* XXX */
939         va_list ap;
940
941         va_start(ap, fmt);
942         vsnprintf(buf, sizeof(buf), fmt, ap);
943         va_end(ap);
944         if_printf(vap->iv_ifp, "[%s] %s\n",
945                 ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
946 }
947
948 void
949 ieee80211_note_mac(const struct ieee80211vap *vap,
950         const uint8_t mac[IEEE80211_ADDR_LEN],
951         const char *fmt, ...)
952 {
953         char buf[128];          /* XXX */
954         va_list ap;
955
956         va_start(ap, fmt);
957         vsnprintf(buf, sizeof(buf), fmt, ap);
958         va_end(ap);
959         if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
960 }
961
962 void
963 ieee80211_discard_frame(const struct ieee80211vap *vap,
964         const struct ieee80211_frame *wh,
965         const char *type, const char *fmt, ...)
966 {
967         va_list ap;
968
969         if_printf(vap->iv_ifp, "[%s] discard ",
970                 ether_sprintf(ieee80211_getbssid(vap, wh)));
971         printf("%s frame, ", type != NULL ? type :
972             ieee80211_mgt_subtype_name(wh->i_fc[0]));
973         va_start(ap, fmt);
974         vprintf(fmt, ap);
975         va_end(ap);
976         printf("\n");
977 }
978
979 void
980 ieee80211_discard_ie(const struct ieee80211vap *vap,
981         const struct ieee80211_frame *wh,
982         const char *type, const char *fmt, ...)
983 {
984         va_list ap;
985
986         if_printf(vap->iv_ifp, "[%s] discard ",
987                 ether_sprintf(ieee80211_getbssid(vap, wh)));
988         if (type != NULL)
989                 printf("%s information element, ", type);
990         else
991                 printf("information element, ");
992         va_start(ap, fmt);
993         vprintf(fmt, ap);
994         va_end(ap);
995         printf("\n");
996 }
997
998 void
999 ieee80211_discard_mac(const struct ieee80211vap *vap,
1000         const uint8_t mac[IEEE80211_ADDR_LEN],
1001         const char *type, const char *fmt, ...)
1002 {
1003         va_list ap;
1004
1005         if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac));
1006         if (type != NULL)
1007                 printf("%s frame, ", type);
1008         else
1009                 printf("frame, ");
1010         va_start(ap, fmt);
1011         vprintf(fmt, ap);
1012         va_end(ap);
1013         printf("\n");
1014 }
1015 #endif /* IEEE80211_DEBUG */