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("$FreeBSD$");
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
48static	int _ieee80211_crypto_delkey(struct ieee80211vap *,
49		struct ieee80211_key *);
50
51/*
52 * Table of registered cipher modules.
53 */
54static	const struct ieee80211_cipher *ciphers[IEEE80211_CIPHER_MAX];
55
56/*
57 * Default "null" key management routines.
58 */
59static int
60null_key_alloc(struct ieee80211vap *vap, struct ieee80211_key *k,
61	ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix)
62{
63	if (!(&vap->iv_nw_keys[0] <= k &&
64	     k < &vap->iv_nw_keys[IEEE80211_WEP_NKID])) {
65		/*
66		 * Not in the global key table, the driver should handle this
67		 * by allocating a slot in the h/w key table/cache.  In
68		 * lieu of that return key slot 0 for any unicast key
69		 * request.  We disallow the request if this is a group key.
70		 * This default policy does the right thing for legacy hardware
71		 * with a 4 key table.  It also handles devices that pass
72		 * packets through untouched when marked with the WEP bit
73		 * and key index 0.
74		 */
75		if (k->wk_flags & IEEE80211_KEY_GROUP)
76			return 0;
77		*keyix = 0;	/* NB: use key index 0 for ucast key */
78	} else {
79		*keyix = k - vap->iv_nw_keys;
80	}
81	*rxkeyix = IEEE80211_KEYIX_NONE;	/* XXX maybe *keyix? */
82	return 1;
83}
84static int
85null_key_delete(struct ieee80211vap *vap, const struct ieee80211_key *k)
86{
87	return 1;
88}
89static 	int
90null_key_set(struct ieee80211vap *vap, const struct ieee80211_key *k,
91	const uint8_t mac[IEEE80211_ADDR_LEN])
92{
93	return 1;
94}
95static void null_key_update(struct ieee80211vap *vap) {}
96
97/*
98 * Write-arounds for common operations.
99 */
100static __inline void
101cipher_detach(struct ieee80211_key *key)
102{
103	key->wk_cipher->ic_detach(key);
104}
105
106static __inline void *
107cipher_attach(struct ieee80211vap *vap, struct ieee80211_key *key)
108{
109	return key->wk_cipher->ic_attach(vap, key);
110}
111
112/*
113 * Wrappers for driver key management methods.
114 */
115static __inline int
116dev_key_alloc(struct ieee80211vap *vap,
117	struct ieee80211_key *key,
118	ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix)
119{
120	return vap->iv_key_alloc(vap, key, keyix, rxkeyix);
121}
122
123static __inline int
124dev_key_delete(struct ieee80211vap *vap,
125	const struct ieee80211_key *key)
126{
127	return vap->iv_key_delete(vap, key);
128}
129
130static __inline int
131dev_key_set(struct ieee80211vap *vap, const struct ieee80211_key *key)
132{
133	return vap->iv_key_set(vap, key, key->wk_macaddr);
134}
135
136/*
137 * Setup crypto support for a device/shared instance.
138 */
139void
140ieee80211_crypto_attach(struct ieee80211com *ic)
141{
142	/* NB: we assume everything is pre-zero'd */
143	ciphers[IEEE80211_CIPHER_NONE] = &ieee80211_cipher_none;
144#if defined(__HAIKU__)
145	ieee80211_crypto_ccmp_load();
146	ieee80211_crypto_tkip_load();
147	ieee80211_crypto_wep_load();
148#endif
149}
150
151/*
152 * Teardown crypto support.
153 */
154void
155ieee80211_crypto_detach(struct ieee80211com *ic)
156{
157#if defined(__HAIKU__)
158	ieee80211_crypto_ccmp_unload();
159	ieee80211_crypto_tkip_unload();
160	ieee80211_crypto_wep_unload();
161#endif
162}
163
164/*
165 * Setup crypto support for a vap.
166 */
167void
168ieee80211_crypto_vattach(struct ieee80211vap *vap)
169{
170	int i;
171
172	/* NB: we assume everything is pre-zero'd */
173	vap->iv_max_keyix = IEEE80211_WEP_NKID;
174	vap->iv_def_txkey = IEEE80211_KEYIX_NONE;
175	for (i = 0; i < IEEE80211_WEP_NKID; i++)
176		ieee80211_crypto_resetkey(vap, &vap->iv_nw_keys[i],
177			IEEE80211_KEYIX_NONE);
178	/*
179	 * Initialize the driver key support routines to noop entries.
180	 * This is useful especially for the cipher test modules.
181	 */
182	vap->iv_key_alloc = null_key_alloc;
183	vap->iv_key_set = null_key_set;
184	vap->iv_key_delete = null_key_delete;
185	vap->iv_key_update_begin = null_key_update;
186	vap->iv_key_update_end = null_key_update;
187}
188
189/*
190 * Teardown crypto support for a vap.
191 */
192void
193ieee80211_crypto_vdetach(struct ieee80211vap *vap)
194{
195	ieee80211_crypto_delglobalkeys(vap);
196}
197
198/*
199 * Register a crypto cipher module.
200 */
201void
202ieee80211_crypto_register(const struct ieee80211_cipher *cip)
203{
204	if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) {
205		printf("%s: cipher %s has an invalid cipher index %u\n",
206			__func__, cip->ic_name, cip->ic_cipher);
207		return;
208	}
209	if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) {
210		printf("%s: cipher %s registered with a different template\n",
211			__func__, cip->ic_name);
212		return;
213	}
214	ciphers[cip->ic_cipher] = cip;
215}
216
217/*
218 * Unregister a crypto cipher module.
219 */
220void
221ieee80211_crypto_unregister(const struct ieee80211_cipher *cip)
222{
223	if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) {
224		printf("%s: cipher %s has an invalid cipher index %u\n",
225			__func__, cip->ic_name, cip->ic_cipher);
226		return;
227	}
228	if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) {
229		printf("%s: cipher %s registered with a different template\n",
230			__func__, cip->ic_name);
231		return;
232	}
233	/* NB: don't complain about not being registered */
234	/* XXX disallow if references */
235	ciphers[cip->ic_cipher] = NULL;
236}
237
238int
239ieee80211_crypto_available(u_int cipher)
240{
241	return cipher < IEEE80211_CIPHER_MAX && ciphers[cipher] != NULL;
242}
243
244/* XXX well-known names! */
245static const char *cipher_modnames[IEEE80211_CIPHER_MAX] = {
246	[IEEE80211_CIPHER_WEP]	   = "wlan_wep",
247	[IEEE80211_CIPHER_TKIP]	   = "wlan_tkip",
248	[IEEE80211_CIPHER_AES_OCB] = "wlan_aes_ocb",
249	[IEEE80211_CIPHER_AES_CCM] = "wlan_ccmp",
250	[IEEE80211_CIPHER_TKIPMIC] = "#4",	/* NB: reserved */
251	[IEEE80211_CIPHER_CKIP]	   = "wlan_ckip",
252	[IEEE80211_CIPHER_NONE]	   = "wlan_none",
253};
254
255/* NB: there must be no overlap between user-supplied and device-owned flags */
256CTASSERT((IEEE80211_KEY_COMMON & IEEE80211_KEY_DEVICE) == 0);
257
258/*
259 * Establish a relationship between the specified key and cipher
260 * and, if necessary, allocate a hardware index from the driver.
261 * Note that when a fixed key index is required it must be specified.
262 *
263 * This must be the first call applied to a key; all the other key
264 * routines assume wk_cipher is setup.
265 *
266 * Locking must be handled by the caller using:
267 *	ieee80211_key_update_begin(vap);
268 *	ieee80211_key_update_end(vap);
269 */
270int
271ieee80211_crypto_newkey(struct ieee80211vap *vap,
272	int cipher, int flags, struct ieee80211_key *key)
273{
274	struct ieee80211com *ic = vap->iv_ic;
275	const struct ieee80211_cipher *cip;
276	ieee80211_keyix keyix, rxkeyix;
277	void *keyctx;
278	int oflags;
279
280	IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
281	    "%s: cipher %u flags 0x%x keyix %u\n",
282	    __func__, cipher, flags, key->wk_keyix);
283
284	/*
285	 * Validate cipher and set reference to cipher routines.
286	 */
287	if (cipher >= IEEE80211_CIPHER_MAX) {
288		IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
289		    "%s: invalid cipher %u\n", __func__, cipher);
290		vap->iv_stats.is_crypto_badcipher++;
291		return 0;
292	}
293	cip = ciphers[cipher];
294	if (cip == NULL) {
295		/*
296		 * Auto-load cipher module if we have a well-known name
297		 * for it.  It might be better to use string names rather
298		 * than numbers and craft a module name based on the cipher
299		 * name; e.g. wlan_cipher_<cipher-name>.
300		 */
301		IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
302		    "%s: unregistered cipher %u, load module %s\n",
303		    __func__, cipher, cipher_modnames[cipher]);
304		ieee80211_load_module(cipher_modnames[cipher]);
305		/*
306		 * If cipher module loaded it should immediately
307		 * call ieee80211_crypto_register which will fill
308		 * in the entry in the ciphers array.
309		 */
310		cip = ciphers[cipher];
311		if (cip == NULL) {
312			IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
313			    "%s: unable to load cipher %u, module %s\n",
314			    __func__, cipher, cipher_modnames[cipher]);
315			vap->iv_stats.is_crypto_nocipher++;
316			return 0;
317		}
318	}
319
320	oflags = key->wk_flags;
321	flags &= IEEE80211_KEY_COMMON;
322	/* NB: preserve device attributes */
323	flags |= (oflags & IEEE80211_KEY_DEVICE);
324	/*
325	 * If the hardware does not support the cipher then
326	 * fallback to a host-based implementation.
327	 */
328	if ((ic->ic_cryptocaps & (1<<cipher)) == 0) {
329		IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
330		    "%s: no h/w support for cipher %s, falling back to s/w\n",
331		    __func__, cip->ic_name);
332		flags |= IEEE80211_KEY_SWCRYPT;
333	}
334	/*
335	 * Hardware TKIP with software MIC is an important
336	 * combination; we handle it by flagging each key,
337	 * the cipher modules honor it.
338	 */
339	if (cipher == IEEE80211_CIPHER_TKIP &&
340	    (ic->ic_cryptocaps & IEEE80211_CRYPTO_TKIPMIC) == 0) {
341		IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
342		    "%s: no h/w support for TKIP MIC, falling back to s/w\n",
343		    __func__);
344		flags |= IEEE80211_KEY_SWMIC;
345	}
346
347	/*
348	 * Bind cipher to key instance.  Note we do this
349	 * after checking the device capabilities so the
350	 * cipher module can optimize space usage based on
351	 * whether or not it needs to do the cipher work.
352	 */
353	if (key->wk_cipher != cip || key->wk_flags != flags) {
354		/*
355		 * Fillin the flags so cipher modules can see s/w
356		 * crypto requirements and potentially allocate
357		 * different state and/or attach different method
358		 * pointers.
359		 */
360		key->wk_flags = flags;
361		keyctx = cip->ic_attach(vap, key);
362		if (keyctx == NULL) {
363			IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
364				"%s: unable to attach cipher %s\n",
365				__func__, cip->ic_name);
366			key->wk_flags = oflags;	/* restore old flags */
367			vap->iv_stats.is_crypto_attachfail++;
368			return 0;
369		}
370		cipher_detach(key);
371		key->wk_cipher = cip;		/* XXX refcnt? */
372		key->wk_private = keyctx;
373	}
374
375	/*
376	 * Ask the driver for a key index if we don't have one.
377	 * Note that entries in the global key table always have
378	 * an index; this means it's safe to call this routine
379	 * for these entries just to setup the reference to the
380	 * cipher template.  Note also that when using software
381	 * crypto we also call the driver to give us a key index.
382	 */
383	if ((key->wk_flags & IEEE80211_KEY_DEVKEY) == 0) {
384		if (!dev_key_alloc(vap, key, &keyix, &rxkeyix)) {
385			/*
386			 * Unable to setup driver state.
387			 */
388			vap->iv_stats.is_crypto_keyfail++;
389			IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
390			    "%s: unable to setup cipher %s\n",
391			    __func__, cip->ic_name);
392			return 0;
393		}
394		if (key->wk_flags != flags) {
395			/*
396			 * Driver overrode flags we setup; typically because
397			 * resources were unavailable to handle _this_ key.
398			 * Re-attach the cipher context to allow cipher
399			 * modules to handle differing requirements.
400			 */
401			IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
402			    "%s: driver override for cipher %s, flags "
403			    "0x%x -> 0x%x\n", __func__, cip->ic_name,
404			    oflags, key->wk_flags);
405			keyctx = cip->ic_attach(vap, key);
406			if (keyctx == NULL) {
407				IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
408				    "%s: unable to attach cipher %s with "
409				    "flags 0x%x\n", __func__, cip->ic_name,
410				    key->wk_flags);
411				key->wk_flags = oflags;	/* restore old flags */
412				vap->iv_stats.is_crypto_attachfail++;
413				return 0;
414			}
415			cipher_detach(key);
416			key->wk_cipher = cip;		/* XXX refcnt? */
417			key->wk_private = keyctx;
418		}
419		key->wk_keyix = keyix;
420		key->wk_rxkeyix = rxkeyix;
421		key->wk_flags |= IEEE80211_KEY_DEVKEY;
422	}
423	return 1;
424}
425
426/*
427 * Remove the key (no locking, for internal use).
428 */
429static int
430_ieee80211_crypto_delkey(struct ieee80211vap *vap, struct ieee80211_key *key)
431{
432	KASSERT(key->wk_cipher != NULL, ("No cipher!"));
433
434	IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
435	    "%s: %s keyix %u flags 0x%x rsc %ju tsc %ju len %u\n",
436	    __func__, key->wk_cipher->ic_name,
437	    key->wk_keyix, key->wk_flags,
438	    key->wk_keyrsc[IEEE80211_NONQOS_TID], key->wk_keytsc,
439	    key->wk_keylen);
440
441	if (key->wk_flags & IEEE80211_KEY_DEVKEY) {
442		/*
443		 * Remove hardware entry.
444		 */
445		/* XXX key cache */
446		if (!dev_key_delete(vap, key)) {
447			IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
448			    "%s: driver did not delete key index %u\n",
449			    __func__, key->wk_keyix);
450			vap->iv_stats.is_crypto_delkey++;
451			/* XXX recovery? */
452		}
453	}
454	cipher_detach(key);
455	memset(key, 0, sizeof(*key));
456	ieee80211_crypto_resetkey(vap, key, IEEE80211_KEYIX_NONE);
457	return 1;
458}
459
460/*
461 * Remove the specified key.
462 */
463int
464ieee80211_crypto_delkey(struct ieee80211vap *vap, struct ieee80211_key *key)
465{
466	int status;
467
468	ieee80211_key_update_begin(vap);
469	status = _ieee80211_crypto_delkey(vap, key);
470	ieee80211_key_update_end(vap);
471	return status;
472}
473
474/*
475 * Clear the global key table.
476 */
477void
478ieee80211_crypto_delglobalkeys(struct ieee80211vap *vap)
479{
480	int i;
481
482	ieee80211_key_update_begin(vap);
483	for (i = 0; i < IEEE80211_WEP_NKID; i++)
484		(void) _ieee80211_crypto_delkey(vap, &vap->iv_nw_keys[i]);
485	ieee80211_key_update_end(vap);
486}
487
488/*
489 * Set the contents of the specified key.
490 *
491 * Locking must be handled by the caller using:
492 *	ieee80211_key_update_begin(vap);
493 *	ieee80211_key_update_end(vap);
494 */
495int
496ieee80211_crypto_setkey(struct ieee80211vap *vap, struct ieee80211_key *key)
497{
498	const struct ieee80211_cipher *cip = key->wk_cipher;
499
500	KASSERT(cip != NULL, ("No cipher!"));
501
502	IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
503	    "%s: %s keyix %u flags 0x%x mac %s rsc %ju tsc %ju len %u\n",
504	    __func__, cip->ic_name, key->wk_keyix,
505	    key->wk_flags, ether_sprintf(key->wk_macaddr),
506	    key->wk_keyrsc[IEEE80211_NONQOS_TID], key->wk_keytsc,
507	    key->wk_keylen);
508
509	if ((key->wk_flags & IEEE80211_KEY_DEVKEY)  == 0) {
510		/* XXX nothing allocated, should not happen */
511		IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
512		    "%s: no device key setup done; should not happen!\n",
513		    __func__);
514		vap->iv_stats.is_crypto_setkey_nokey++;
515		return 0;
516	}
517	/*
518	 * Give cipher a chance to validate key contents.
519	 * XXX should happen before modifying state.
520	 */
521	if (!cip->ic_setkey(key)) {
522		IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO,
523		    "%s: cipher %s rejected key index %u len %u flags 0x%x\n",
524		    __func__, cip->ic_name, key->wk_keyix,
525		    key->wk_keylen, key->wk_flags);
526		vap->iv_stats.is_crypto_setkey_cipher++;
527		return 0;
528	}
529	return dev_key_set(vap, key);
530}
531
532/*
533 * Add privacy headers appropriate for the specified key.
534 */
535struct ieee80211_key *
536ieee80211_crypto_encap(struct ieee80211_node *ni, struct mbuf *m)
537{
538	struct ieee80211vap *vap = ni->ni_vap;
539	struct ieee80211_key *k;
540	struct ieee80211_frame *wh;
541	const struct ieee80211_cipher *cip;
542	uint8_t keyid;
543
544	/*
545	 * Multicast traffic always uses the multicast key.
546	 * Otherwise if a unicast key is set we use that and
547	 * it is always key index 0.  When no unicast key is
548	 * set we fall back to the default transmit key.
549	 */
550	wh = mtod(m, struct ieee80211_frame *);
551	if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
552	    IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) {
553		if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE) {
554			IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,
555			    wh->i_addr1,
556			    "no default transmit key (%s) deftxkey %u",
557			    __func__, vap->iv_def_txkey);
558			vap->iv_stats.is_tx_nodefkey++;
559			return NULL;
560		}
561		keyid = vap->iv_def_txkey;
562		k = &vap->iv_nw_keys[vap->iv_def_txkey];
563	} else {
564		keyid = 0;
565		k = &ni->ni_ucastkey;
566	}
567	cip = k->wk_cipher;
568	return (cip->ic_encap(k, m, keyid<<6) ? k : NULL);
569}
570
571/*
572 * Validate and strip privacy headers (and trailer) for a
573 * received frame that has the WEP/Privacy bit set.
574 */
575struct ieee80211_key *
576ieee80211_crypto_decap(struct ieee80211_node *ni, struct mbuf *m, int hdrlen)
577{
578#define	IEEE80211_WEP_HDRLEN	(IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN)
579#define	IEEE80211_WEP_MINLEN \
580	(sizeof(struct ieee80211_frame) + \
581	IEEE80211_WEP_HDRLEN + IEEE80211_WEP_CRCLEN)
582	struct ieee80211vap *vap = ni->ni_vap;
583	struct ieee80211_key *k;
584	struct ieee80211_frame *wh;
585	const struct ieee80211_cipher *cip;
586	uint8_t keyid;
587
588	/* NB: this minimum size data frame could be bigger */
589	if (m->m_pkthdr.len < IEEE80211_WEP_MINLEN) {
590		IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
591			"%s: WEP data frame too short, len %u\n",
592			__func__, m->m_pkthdr.len);
593		vap->iv_stats.is_rx_tooshort++;	/* XXX need unique stat? */
594		return NULL;
595	}
596
597	/*
598	 * Locate the key. If unicast and there is no unicast
599	 * key then we fall back to the key id in the header.
600	 * This assumes unicast keys are only configured when
601	 * the key id in the header is meaningless (typically 0).
602	 */
603	wh = mtod(m, struct ieee80211_frame *);
604	m_copydata(m, hdrlen + IEEE80211_WEP_IVLEN, sizeof(keyid), &keyid);
605	if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
606	    IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey))
607		k = &vap->iv_nw_keys[keyid >> 6];
608	else
609		k = &ni->ni_ucastkey;
610
611	/*
612	 * Insure crypto header is contiguous for all decap work.
613	 */
614	cip = k->wk_cipher;
615	if (m->m_len < hdrlen + cip->ic_header &&
616	    (m = m_pullup(m, hdrlen + cip->ic_header)) == NULL) {
617		IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
618		    "unable to pullup %s header", cip->ic_name);
619		vap->iv_stats.is_rx_wepfail++;	/* XXX */
620		return NULL;
621	}
622
623	return (cip->ic_decap(k, m, hdrlen) ? k : NULL);
624#undef IEEE80211_WEP_MINLEN
625#undef IEEE80211_WEP_HDRLEN
626}
627
628static void
629load_ucastkey(void *arg, struct ieee80211_node *ni)
630{
631	struct ieee80211vap *vap = ni->ni_vap;
632	struct ieee80211_key *k;
633
634	if (vap->iv_state != IEEE80211_S_RUN)
635		return;
636	k = &ni->ni_ucastkey;
637	if (k->wk_flags & IEEE80211_KEY_DEVKEY)
638		dev_key_set(vap, k);
639}
640
641/*
642 * Re-load all keys known to the 802.11 layer that may
643 * have hardware state backing them.  This is used by
644 * drivers on resume to push keys down into the device.
645 */
646void
647ieee80211_crypto_reload_keys(struct ieee80211com *ic)
648{
649	struct ieee80211vap *vap;
650	int i;
651
652	/*
653	 * Keys in the global key table of each vap.
654	 */
655	/* NB: used only during resume so don't lock for now */
656	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
657		if (vap->iv_state != IEEE80211_S_RUN)
658			continue;
659		for (i = 0; i < IEEE80211_WEP_NKID; i++) {
660			const struct ieee80211_key *k = &vap->iv_nw_keys[i];
661			if (k->wk_flags & IEEE80211_KEY_DEVKEY)
662				dev_key_set(vap, k);
663		}
664	}
665	/*
666	 * Unicast keys.
667	 */
668	ieee80211_iterate_nodes(&ic->ic_sta, load_ucastkey, NULL);
669}
670