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: releng/11.2/sys/net80211/ieee80211_crypto.c 288635 2015-10-03 21:48:27Z adrian $");
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
48 MALLOC_DEFINE(M_80211_CRYPTO, "80211crypto", "802.11 crypto state");
49
50 static int _ieee80211_crypto_delkey(struct ieee80211vap *,
51 struct ieee80211_key *);
52
53 /*
54 * Table of registered cipher modules.
55 */
56 static const struct ieee80211_cipher *ciphers[IEEE80211_CIPHER_MAX];
57
58 /*
59 * Default "null" key management routines.
60 */
61 static int
62 null_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 }
86 static int
87 null_key_delete(struct ieee80211vap *vap, const struct ieee80211_key *k)
88 {
89 return 1;
90 }
91 static int
92 null_key_set(struct ieee80211vap *vap, const struct ieee80211_key *k)
93 {
94 return 1;
95 }
96 static void null_key_update(struct ieee80211vap *vap) {}
97
98 /*
99 * Write-arounds for common operations.
100 */
101 static __inline void
102 cipher_detach(struct ieee80211_key *key)
103 {
104 key->wk_cipher->ic_detach(key);
105 }
106
107 static __inline void *
108 cipher_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 */
116 static __inline int
117 dev_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
124 static __inline int
125 dev_key_delete(struct ieee80211vap *vap,
126 const struct ieee80211_key *key)
127 {
128 return vap->iv_key_delete(vap, key);
129 }
130
131 static __inline int
132 dev_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 */
140 void
141 ieee80211_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 */
150 void
151 ieee80211_crypto_detach(struct ieee80211com *ic)
152 {
153 }
154
155 /*
156 * Setup crypto support for a vap.
157 */
158 void
159 ieee80211_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 */
183 void
184 ieee80211_crypto_vdetach(struct ieee80211vap *vap)
185 {
186 ieee80211_crypto_delglobalkeys(vap);
187 }
188
189 /*
190 * Register a crypto cipher module.
191 */
192 void
193 ieee80211_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 */
211 void
212 ieee80211_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
229 int
230 ieee80211_crypto_available(u_int cipher)
231 {
232 return cipher < IEEE80211_CIPHER_MAX && ciphers[cipher] != NULL;
233 }
234
235 /* XXX well-known names! */
236 static 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 */
247 CTASSERT((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 */
261 int
262 ieee80211_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 */
420 static 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 */
454 int
455 ieee80211_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 */
468 void
469 ieee80211_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 */
486 int
487 ieee80211_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
523 uint8_t
524 ieee80211_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
533 struct ieee80211_key *
534 ieee80211_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 */
565 struct ieee80211_key *
566 ieee80211_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 */
583 struct ieee80211_key *
584 ieee80211_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 for all decap work.
621 */
622 cip = k->wk_cipher;
623 if (m->m_len < hdrlen + cip->ic_header &&
624 (m = m_pullup(m, hdrlen + cip->ic_header)) == NULL) {
625 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
626 "unable to pullup %s header", cip->ic_name);
627 vap->iv_stats.is_rx_wepfail++; /* XXX */
628 return NULL;
629 }
630
631 return (cip->ic_decap(k, m, hdrlen) ? k : NULL);
632 #undef IEEE80211_WEP_MINLEN
633 #undef IEEE80211_WEP_HDRLEN
634 }
635
636 static void
637 load_ucastkey(void *arg, struct ieee80211_node *ni)
638 {
639 struct ieee80211vap *vap = ni->ni_vap;
640 struct ieee80211_key *k;
641
642 if (vap->iv_state != IEEE80211_S_RUN)
643 return;
644 k = &ni->ni_ucastkey;
645 if (k->wk_flags & IEEE80211_KEY_DEVKEY)
646 dev_key_set(vap, k);
647 }
648
649 /*
650 * Re-load all keys known to the 802.11 layer that may
651 * have hardware state backing them. This is used by
652 * drivers on resume to push keys down into the device.
653 */
654 void
655 ieee80211_crypto_reload_keys(struct ieee80211com *ic)
656 {
657 struct ieee80211vap *vap;
658 int i;
659
660 /*
661 * Keys in the global key table of each vap.
662 */
663 /* NB: used only during resume so don't lock for now */
664 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
665 if (vap->iv_state != IEEE80211_S_RUN)
666 continue;
667 for (i = 0; i < IEEE80211_WEP_NKID; i++) {
668 const struct ieee80211_key *k = &vap->iv_nw_keys[i];
669 if (k->wk_flags & IEEE80211_KEY_DEVKEY)
670 dev_key_set(vap, k);
671 }
672 }
673 /*
674 * Unicast keys.
675 */
676 ieee80211_iterate_nodes(&ic->ic_sta, load_ucastkey, NULL);
677 }
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