1/*-
2 * Copyright (c) 2001 Atsushi Onoe
3 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/sys/net80211/ieee80211_crypto.c 343464 2019-01-26 12:35:06Z avos $");
29
30/*
31 * IEEE 802.11 generic crypto support.
32 */
33#include "opt_wlan.h"
34
35#include <sys/param.h>
36#include <sys/kernel.h>
37#include <sys/malloc.h>
38#include <sys/mbuf.h>
39
40#include <sys/socket.h>
41
42#include <net/if.h>
43#include <net/if_media.h>
44#include <net/ethernet.h>		/* XXX ETHER_HDR_LEN */
45
46#include <net80211/ieee80211_var.h>
47
48MALLOC_DEFINE(M_80211_CRYPTO, "80211crypto", "802.11 crypto state");
49
50static	int _ieee80211_crypto_delkey(struct ieee80211vap *,
51		struct ieee80211_key *);
52
53/*
54 * Table of registered cipher modules.
55 */
56static	const struct ieee80211_cipher *ciphers[IEEE80211_CIPHER_MAX];
57
58/*
59 * Default "null" key management routines.
60 */
61static int
62null_key_alloc(struct ieee80211vap *vap, struct ieee80211_key *k,
63	ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix)
64{
65	if (!(&vap->iv_nw_keys[0] <= k &&
66	     k < &vap->iv_nw_keys[IEEE80211_WEP_NKID])) {
67		/*
68		 * Not in the global key table, the driver should handle this
69		 * by allocating a slot in the h/w key table/cache.  In
70		 * lieu of that return key slot 0 for any unicast key
71		 * request.  We disallow the request if this is a group key.
72		 * This default policy does the right thing for legacy hardware
73		 * with a 4 key table.  It also handles devices that pass
74		 * packets through untouched when marked with the WEP bit
75		 * and key index 0.
76		 */
77		if (k->wk_flags & IEEE80211_KEY_GROUP)
78			return 0;
79		*keyix = 0;	/* NB: use key index 0 for ucast key */
80	} else {
81		*keyix = k - vap->iv_nw_keys;
82	}
83	*rxkeyix = IEEE80211_KEYIX_NONE;	/* XXX maybe *keyix? */
84	return 1;
85}
86static int
87null_key_delete(struct ieee80211vap *vap, const struct ieee80211_key *k)
88{
89	return 1;
90}
91static 	int
92null_key_set(struct ieee80211vap *vap, const struct ieee80211_key *k)
93{
94	return 1;
95}
96static void null_key_update(struct ieee80211vap *vap) {}
97
98/*
99 * Write-arounds for common operations.
100 */
101static __inline void
102cipher_detach(struct ieee80211_key *key)
103{
104	key->wk_cipher->ic_detach(key);
105}
106
107static __inline void *
108cipher_attach(struct ieee80211vap *vap, struct ieee80211_key *key)
109{
110	return key->wk_cipher->ic_attach(vap, key);
111}
112
113/*
114 * Wrappers for driver key management methods.
115 */
116static __inline int
117dev_key_alloc(struct ieee80211vap *vap,
118	struct ieee80211_key *key,
119	ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix)
120{
121	return vap->iv_key_alloc(vap, key, keyix, rxkeyix);
122}
123
124static __inline int
125dev_key_delete(struct ieee80211vap *vap,
126	const struct ieee80211_key *key)
127{
128	return vap->iv_key_delete(vap, key);
129}
130
131static __inline int
132dev_key_set(struct ieee80211vap *vap, const struct ieee80211_key *key)
133{
134	return vap->iv_key_set(vap, key);
135}
136
137/*
138 * Setup crypto support for a device/shared instance.
139 */
140void
141ieee80211_crypto_attach(struct ieee80211com *ic)
142{
143	/* NB: we assume everything is pre-zero'd */
144	ciphers[IEEE80211_CIPHER_NONE] = &ieee80211_cipher_none;
145}
146
147/*
148 * Teardown crypto support.
149 */
150void
151ieee80211_crypto_detach(struct ieee80211com *ic)
152{
153}
154
155/*
156 * Setup crypto support for a vap.
157 */
158void
159ieee80211_crypto_vattach(struct ieee80211vap *vap)
160{
161	int i;
162
163	/* NB: we assume everything is pre-zero'd */
164	vap->iv_max_keyix = IEEE80211_WEP_NKID;
165	vap->iv_def_txkey = IEEE80211_KEYIX_NONE;
166	for (i = 0; i < IEEE80211_WEP_NKID; i++)
167		ieee80211_crypto_resetkey(vap, &vap->iv_nw_keys[i],
168			IEEE80211_KEYIX_NONE);
169	/*
170	 * Initialize the driver key support routines to noop entries.
171	 * This is useful especially for the cipher test modules.
172	 */
173	vap->iv_key_alloc = null_key_alloc;
174	vap->iv_key_set = null_key_set;
175	vap->iv_key_delete = null_key_delete;
176	vap->iv_key_update_begin = null_key_update;
177	vap->iv_key_update_end = null_key_update;
178}
179
180/*
181 * Teardown crypto support for a vap.
182 */
183void
184ieee80211_crypto_vdetach(struct ieee80211vap *vap)
185{
186	ieee80211_crypto_delglobalkeys(vap);
187}
188
189/*
190 * Register a crypto cipher module.
191 */
192void
193ieee80211_crypto_register(const struct ieee80211_cipher *cip)
194{
195	if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) {
196		printf("%s: cipher %s has an invalid cipher index %u\n",
197			__func__, cip->ic_name, cip->ic_cipher);
198		return;
199	}
200	if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) {
201		printf("%s: cipher %s registered with a different template\n",
202			__func__, cip->ic_name);
203		return;
204	}
205	ciphers[cip->ic_cipher] = cip;
206}
207
208/*
209 * Unregister a crypto cipher module.
210 */
211void
212ieee80211_crypto_unregister(const struct ieee80211_cipher *cip)
213{
214	if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) {
215		printf("%s: cipher %s has an invalid cipher index %u\n",
216			__func__, cip->ic_name, cip->ic_cipher);
217		return;
218	}
219	if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) {
220		printf("%s: cipher %s registered with a different template\n",
221			__func__, cip->ic_name);
222		return;
223	}
224	/* NB: don't complain about not being registered */
225	/* XXX disallow if references */
226	ciphers[cip->ic_cipher] = NULL;
227}
228
229int
230ieee80211_crypto_available(u_int cipher)
231{
232	return cipher < IEEE80211_CIPHER_MAX && ciphers[cipher] != NULL;
233}
234
235/* XXX well-known names! */
236static const char *cipher_modnames[IEEE80211_CIPHER_MAX] = {
237	[IEEE80211_CIPHER_WEP]	   = "wlan_wep",
238	[IEEE80211_CIPHER_TKIP]	   = "wlan_tkip",
239	[IEEE80211_CIPHER_AES_OCB] = "wlan_aes_ocb",
240	[IEEE80211_CIPHER_AES_CCM] = "wlan_ccmp",
241	[IEEE80211_CIPHER_TKIPMIC] = "#4",	/* NB: reserved */
242	[IEEE80211_CIPHER_CKIP]	   = "wlan_ckip",
243	[IEEE80211_CIPHER_NONE]	   = "wlan_none",
244};
245
246/* NB: there must be no overlap between user-supplied and device-owned flags */
247CTASSERT((IEEE80211_KEY_COMMON & IEEE80211_KEY_DEVICE) == 0);
248
249/*
250 * Establish a relationship between the specified key and cipher
251 * and, if necessary, allocate a hardware index from the driver.
252 * Note that when a fixed key index is required it must be specified.
253 *
254 * This must be the first call applied to a key; all the other key
255 * routines assume wk_cipher is setup.
256 *
257 * Locking must be handled by the caller using:
258 *	ieee80211_key_update_begin(vap);
259 *	ieee80211_key_update_end(vap);
260 */
261int
262ieee80211_crypto_newkey(struct ieee80211vap *vap,
263	int cipher, int flags, struct ieee80211_key *key)
264{
265	struct ieee80211com *ic = vap->iv_ic;
266	const struct ieee80211_cipher *cip;
267	ieee80211_keyix keyix, rxkeyix;
268	void *keyctx;
269	int oflags;
270
271	IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
272	    "%s: cipher %u flags 0x%x keyix %u\n",
273	    __func__, cipher, flags, key->wk_keyix);
274
275	/*
276	 * Validate cipher and set reference to cipher routines.
277	 */
278	if (cipher >= IEEE80211_CIPHER_MAX) {
279		IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
280		    "%s: invalid cipher %u\n", __func__, cipher);
281		vap->iv_stats.is_crypto_badcipher++;
282		return 0;
283	}
284	cip = ciphers[cipher];
285	if (cip == NULL) {
286		/*
287		 * Auto-load cipher module if we have a well-known name
288		 * for it.  It might be better to use string names rather
289		 * than numbers and craft a module name based on the cipher
290		 * name; e.g. wlan_cipher_<cipher-name>.
291		 */
292		IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
293		    "%s: unregistered cipher %u, load module %s\n",
294		    __func__, cipher, cipher_modnames[cipher]);
295		ieee80211_load_module(cipher_modnames[cipher]);
296		/*
297		 * If cipher module loaded it should immediately
298		 * call ieee80211_crypto_register which will fill
299		 * in the entry in the ciphers array.
300		 */
301		cip = ciphers[cipher];
302		if (cip == NULL) {
303			IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
304			    "%s: unable to load cipher %u, module %s\n",
305			    __func__, cipher, cipher_modnames[cipher]);
306			vap->iv_stats.is_crypto_nocipher++;
307			return 0;
308		}
309	}
310
311	oflags = key->wk_flags;
312	flags &= IEEE80211_KEY_COMMON;
313	/* NB: preserve device attributes */
314	flags |= (oflags & IEEE80211_KEY_DEVICE);
315	/*
316	 * If the hardware does not support the cipher then
317	 * fallback to a host-based implementation.
318	 */
319	if ((ic->ic_cryptocaps & (1<<cipher)) == 0) {
320		IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
321		    "%s: no h/w support for cipher %s, falling back to s/w\n",
322		    __func__, cip->ic_name);
323		flags |= IEEE80211_KEY_SWCRYPT;
324	}
325	/*
326	 * Hardware TKIP with software MIC is an important
327	 * combination; we handle it by flagging each key,
328	 * the cipher modules honor it.
329	 */
330	if (cipher == IEEE80211_CIPHER_TKIP &&
331	    (ic->ic_cryptocaps & IEEE80211_CRYPTO_TKIPMIC) == 0) {
332		IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
333		    "%s: no h/w support for TKIP MIC, falling back to s/w\n",
334		    __func__);
335		flags |= IEEE80211_KEY_SWMIC;
336	}
337
338	/*
339	 * Bind cipher to key instance.  Note we do this
340	 * after checking the device capabilities so the
341	 * cipher module can optimize space usage based on
342	 * whether or not it needs to do the cipher work.
343	 */
344	if (key->wk_cipher != cip || key->wk_flags != flags) {
345		/*
346		 * Fillin the flags so cipher modules can see s/w
347		 * crypto requirements and potentially allocate
348		 * different state and/or attach different method
349		 * pointers.
350		 */
351		key->wk_flags = flags;
352		keyctx = cip->ic_attach(vap, key);
353		if (keyctx == NULL) {
354			IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
355				"%s: unable to attach cipher %s\n",
356				__func__, cip->ic_name);
357			key->wk_flags = oflags;	/* restore old flags */
358			vap->iv_stats.is_crypto_attachfail++;
359			return 0;
360		}
361		cipher_detach(key);
362		key->wk_cipher = cip;		/* XXX refcnt? */
363		key->wk_private = keyctx;
364	}
365
366	/*
367	 * Ask the driver for a key index if we don't have one.
368	 * Note that entries in the global key table always have
369	 * an index; this means it's safe to call this routine
370	 * for these entries just to setup the reference to the
371	 * cipher template.  Note also that when using software
372	 * crypto we also call the driver to give us a key index.
373	 */
374	if ((key->wk_flags & IEEE80211_KEY_DEVKEY) == 0) {
375		if (!dev_key_alloc(vap, key, &keyix, &rxkeyix)) {
376			/*
377			 * Unable to setup driver state.
378			 */
379			vap->iv_stats.is_crypto_keyfail++;
380			IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
381			    "%s: unable to setup cipher %s\n",
382			    __func__, cip->ic_name);
383			return 0;
384		}
385		if (key->wk_flags != flags) {
386			/*
387			 * Driver overrode flags we setup; typically because
388			 * resources were unavailable to handle _this_ key.
389			 * Re-attach the cipher context to allow cipher
390			 * modules to handle differing requirements.
391			 */
392			IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
393			    "%s: driver override for cipher %s, flags "
394			    "0x%x -> 0x%x\n", __func__, cip->ic_name,
395			    oflags, key->wk_flags);
396			keyctx = cip->ic_attach(vap, key);
397			if (keyctx == NULL) {
398				IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
399				    "%s: unable to attach cipher %s with "
400				    "flags 0x%x\n", __func__, cip->ic_name,
401				    key->wk_flags);
402				key->wk_flags = oflags;	/* restore old flags */
403				vap->iv_stats.is_crypto_attachfail++;
404				return 0;
405			}
406			cipher_detach(key);
407			key->wk_cipher = cip;		/* XXX refcnt? */
408			key->wk_private = keyctx;
409		}
410		key->wk_keyix = keyix;
411		key->wk_rxkeyix = rxkeyix;
412		key->wk_flags |= IEEE80211_KEY_DEVKEY;
413	}
414	return 1;
415}
416
417/*
418 * Remove the key (no locking, for internal use).
419 */
420static int
421_ieee80211_crypto_delkey(struct ieee80211vap *vap, struct ieee80211_key *key)
422{
423	KASSERT(key->wk_cipher != NULL, ("No cipher!"));
424
425	IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
426	    "%s: %s keyix %u flags 0x%x rsc %ju tsc %ju len %u\n",
427	    __func__, key->wk_cipher->ic_name,
428	    key->wk_keyix, key->wk_flags,
429	    key->wk_keyrsc[IEEE80211_NONQOS_TID], key->wk_keytsc,
430	    key->wk_keylen);
431
432	if (key->wk_flags & IEEE80211_KEY_DEVKEY) {
433		/*
434		 * Remove hardware entry.
435		 */
436		/* XXX key cache */
437		if (!dev_key_delete(vap, key)) {
438			IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
439			    "%s: driver did not delete key index %u\n",
440			    __func__, key->wk_keyix);
441			vap->iv_stats.is_crypto_delkey++;
442			/* XXX recovery? */
443		}
444	}
445	cipher_detach(key);
446	memset(key, 0, sizeof(*key));
447	ieee80211_crypto_resetkey(vap, key, IEEE80211_KEYIX_NONE);
448	return 1;
449}
450
451/*
452 * Remove the specified key.
453 */
454int
455ieee80211_crypto_delkey(struct ieee80211vap *vap, struct ieee80211_key *key)
456{
457	int status;
458
459	ieee80211_key_update_begin(vap);
460	status = _ieee80211_crypto_delkey(vap, key);
461	ieee80211_key_update_end(vap);
462	return status;
463}
464
465/*
466 * Clear the global key table.
467 */
468void
469ieee80211_crypto_delglobalkeys(struct ieee80211vap *vap)
470{
471	int i;
472
473	ieee80211_key_update_begin(vap);
474	for (i = 0; i < IEEE80211_WEP_NKID; i++)
475		(void) _ieee80211_crypto_delkey(vap, &vap->iv_nw_keys[i]);
476	ieee80211_key_update_end(vap);
477}
478
479/*
480 * Set the contents of the specified key.
481 *
482 * Locking must be handled by the caller using:
483 *	ieee80211_key_update_begin(vap);
484 *	ieee80211_key_update_end(vap);
485 */
486int
487ieee80211_crypto_setkey(struct ieee80211vap *vap, struct ieee80211_key *key)
488{
489	const struct ieee80211_cipher *cip = key->wk_cipher;
490
491	KASSERT(cip != NULL, ("No cipher!"));
492
493	IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
494	    "%s: %s keyix %u flags 0x%x mac %s rsc %ju tsc %ju len %u\n",
495	    __func__, cip->ic_name, key->wk_keyix,
496	    key->wk_flags, ether_sprintf(key->wk_macaddr),
497	    key->wk_keyrsc[IEEE80211_NONQOS_TID], key->wk_keytsc,
498	    key->wk_keylen);
499
500	if ((key->wk_flags & IEEE80211_KEY_DEVKEY)  == 0) {
501		/* XXX nothing allocated, should not happen */
502		IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
503		    "%s: no device key setup done; should not happen!\n",
504		    __func__);
505		vap->iv_stats.is_crypto_setkey_nokey++;
506		return 0;
507	}
508	/*
509	 * Give cipher a chance to validate key contents.
510	 * XXX should happen before modifying state.
511	 */
512	if (!cip->ic_setkey(key)) {
513		IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
514		    "%s: cipher %s rejected key index %u len %u flags 0x%x\n",
515		    __func__, cip->ic_name, key->wk_keyix,
516		    key->wk_keylen, key->wk_flags);
517		vap->iv_stats.is_crypto_setkey_cipher++;
518		return 0;
519	}
520	return dev_key_set(vap, key);
521}
522
523uint8_t
524ieee80211_crypto_get_keyid(struct ieee80211vap *vap, struct ieee80211_key *k)
525{
526	if (k >= &vap->iv_nw_keys[0] &&
527	    k <  &vap->iv_nw_keys[IEEE80211_WEP_NKID])
528		return (k - vap->iv_nw_keys);
529	else
530		return (0);
531}
532
533struct ieee80211_key *
534ieee80211_crypto_get_txkey(struct ieee80211_node *ni, struct mbuf *m)
535{
536	struct ieee80211vap *vap = ni->ni_vap;
537	struct ieee80211_frame *wh;
538
539	/*
540	 * Multicast traffic always uses the multicast key.
541	 * Otherwise if a unicast key is set we use that and
542	 * it is always key index 0.  When no unicast key is
543	 * set we fall back to the default transmit key.
544	 */
545	wh = mtod(m, struct ieee80211_frame *);
546	if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
547	    IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) {
548		if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE) {
549			IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,
550			    wh->i_addr1,
551			    "no default transmit key (%s) deftxkey %u",
552			    __func__, vap->iv_def_txkey);
553			vap->iv_stats.is_tx_nodefkey++;
554			return NULL;
555		}
556		return &vap->iv_nw_keys[vap->iv_def_txkey];
557	}
558
559	return &ni->ni_ucastkey;
560}
561
562/*
563 * Add privacy headers appropriate for the specified key.
564 */
565struct ieee80211_key *
566ieee80211_crypto_encap(struct ieee80211_node *ni, struct mbuf *m)
567{
568	struct ieee80211_key *k;
569	const struct ieee80211_cipher *cip;
570
571	if ((k = ieee80211_crypto_get_txkey(ni, m)) != NULL) {
572		cip = k->wk_cipher;
573		return (cip->ic_encap(k, m) ? k : NULL);
574	}
575
576	return NULL;
577}
578
579/*
580 * Validate and strip privacy headers (and trailer) for a
581 * received frame that has the WEP/Privacy bit set.
582 */
583struct ieee80211_key *
584ieee80211_crypto_decap(struct ieee80211_node *ni, struct mbuf *m, int hdrlen)
585{
586#define	IEEE80211_WEP_HDRLEN	(IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN)
587#define	IEEE80211_WEP_MINLEN \
588	(sizeof(struct ieee80211_frame) + \
589	IEEE80211_WEP_HDRLEN + IEEE80211_WEP_CRCLEN)
590	struct ieee80211vap *vap = ni->ni_vap;
591	struct ieee80211_key *k;
592	struct ieee80211_frame *wh;
593	const struct ieee80211_cipher *cip;
594	uint8_t keyid;
595
596	/* NB: this minimum size data frame could be bigger */
597	if (m->m_pkthdr.len < IEEE80211_WEP_MINLEN) {
598		IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
599			"%s: WEP data frame too short, len %u\n",
600			__func__, m->m_pkthdr.len);
601		vap->iv_stats.is_rx_tooshort++;	/* XXX need unique stat? */
602		return NULL;
603	}
604
605	/*
606	 * Locate the key. If unicast and there is no unicast
607	 * key then we fall back to the key id in the header.
608	 * This assumes unicast keys are only configured when
609	 * the key id in the header is meaningless (typically 0).
610	 */
611	wh = mtod(m, struct ieee80211_frame *);
612	m_copydata(m, hdrlen + IEEE80211_WEP_IVLEN, sizeof(keyid), &keyid);
613	if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
614	    IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey))
615		k = &vap->iv_nw_keys[keyid >> 6];
616	else
617		k = &ni->ni_ucastkey;
618
619	/*
620	 * Insure crypto header is contiguous and long enough for all
621	 * decap work.
622	 */
623	cip = k->wk_cipher;
624	if (m->m_len < hdrlen + cip->ic_header) {
625		IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
626		    "frame is too short (%d < %u) for crypto decap",
627		    cip->ic_name, m->m_len, hdrlen + cip->ic_header);
628		vap->iv_stats.is_rx_tooshort++;
629		return NULL;
630	}
631
632	return (cip->ic_decap(k, m, hdrlen) ? k : NULL);
633#undef IEEE80211_WEP_MINLEN
634#undef IEEE80211_WEP_HDRLEN
635}
636
637static void
638load_ucastkey(void *arg, struct ieee80211_node *ni)
639{
640	struct ieee80211vap *vap = ni->ni_vap;
641	struct ieee80211_key *k;
642
643	if (vap->iv_state != IEEE80211_S_RUN)
644		return;
645	k = &ni->ni_ucastkey;
646	if (k->wk_flags & IEEE80211_KEY_DEVKEY)
647		dev_key_set(vap, k);
648}
649
650/*
651 * Re-load all keys known to the 802.11 layer that may
652 * have hardware state backing them.  This is used by
653 * drivers on resume to push keys down into the device.
654 */
655void
656ieee80211_crypto_reload_keys(struct ieee80211com *ic)
657{
658	struct ieee80211vap *vap;
659	int i;
660
661	/*
662	 * Keys in the global key table of each vap.
663	 */
664	/* NB: used only during resume so don't lock for now */
665	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
666		if (vap->iv_state != IEEE80211_S_RUN)
667			continue;
668		for (i = 0; i < IEEE80211_WEP_NKID; i++) {
669			const struct ieee80211_key *k = &vap->iv_nw_keys[i];
670			if (k->wk_flags & IEEE80211_KEY_DEVKEY)
671				dev_key_set(vap, k);
672		}
673	}
674	/*
675	 * Unicast keys.
676	 */
677	ieee80211_iterate_nodes(&ic->ic_sta, load_ucastkey, NULL);
678}
679