Commit | Line | Data |
---|---|---|
b453872c JG |
1 | /* |
2 | * Host AP crypt: host-based CCMP encryption implementation for Host AP driver | |
3 | * | |
85d32e7b | 4 | * Copyright (c) 2003-2004, Jouni Malinen <j@w1.fi> |
b453872c JG |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. See README and COPYING for | |
9 | * more details. | |
10 | */ | |
11 | ||
172589cc | 12 | #include <linux/kernel.h> |
f12cc209 | 13 | #include <linux/err.h> |
b453872c JG |
14 | #include <linux/module.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/random.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/if_ether.h> | |
21 | #include <linux/if_arp.h> | |
22 | #include <asm/string.h> | |
23 | #include <linux/wireless.h> | |
24 | ||
25 | #include <net/ieee80211.h> | |
26 | ||
b453872c JG |
27 | #include <linux/crypto.h> |
28 | #include <asm/scatterlist.h> | |
29 | ||
30 | MODULE_AUTHOR("Jouni Malinen"); | |
31 | MODULE_DESCRIPTION("Host AP crypt: CCMP"); | |
32 | MODULE_LICENSE("GPL"); | |
33 | ||
34 | #define AES_BLOCK_LEN 16 | |
35 | #define CCMP_HDR_LEN 8 | |
36 | #define CCMP_MIC_LEN 8 | |
37 | #define CCMP_TK_LEN 16 | |
38 | #define CCMP_PN_LEN 6 | |
39 | ||
40 | struct ieee80211_ccmp_data { | |
41 | u8 key[CCMP_TK_LEN]; | |
42 | int key_set; | |
43 | ||
44 | u8 tx_pn[CCMP_PN_LEN]; | |
45 | u8 rx_pn[CCMP_PN_LEN]; | |
46 | ||
47 | u32 dot11RSNAStatsCCMPFormatErrors; | |
48 | u32 dot11RSNAStatsCCMPReplays; | |
49 | u32 dot11RSNAStatsCCMPDecryptErrors; | |
50 | ||
51 | int key_idx; | |
52 | ||
f12cc209 | 53 | struct crypto_cipher *tfm; |
b453872c JG |
54 | |
55 | /* scratch buffers for virt_to_page() (crypto API) */ | |
56 | u8 tx_b0[AES_BLOCK_LEN], tx_b[AES_BLOCK_LEN], | |
0edd5b44 | 57 | tx_e[AES_BLOCK_LEN], tx_s0[AES_BLOCK_LEN]; |
b453872c JG |
58 | u8 rx_b0[AES_BLOCK_LEN], rx_b[AES_BLOCK_LEN], rx_a[AES_BLOCK_LEN]; |
59 | }; | |
60 | ||
f12cc209 HX |
61 | static inline void ieee80211_ccmp_aes_encrypt(struct crypto_cipher *tfm, |
62 | const u8 pt[16], u8 ct[16]) | |
b453872c | 63 | { |
f12cc209 | 64 | crypto_cipher_encrypt_one(tfm, ct, pt); |
b453872c JG |
65 | } |
66 | ||
6eb6edf0 | 67 | static void *ieee80211_ccmp_init(int key_idx) |
b453872c JG |
68 | { |
69 | struct ieee80211_ccmp_data *priv; | |
70 | ||
0da974f4 | 71 | priv = kzalloc(sizeof(*priv), GFP_ATOMIC); |
b453872c JG |
72 | if (priv == NULL) |
73 | goto fail; | |
b453872c JG |
74 | priv->key_idx = key_idx; |
75 | ||
f12cc209 HX |
76 | priv->tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); |
77 | if (IS_ERR(priv->tfm)) { | |
b453872c JG |
78 | printk(KERN_DEBUG "ieee80211_crypt_ccmp: could not allocate " |
79 | "crypto API aes\n"); | |
f12cc209 | 80 | priv->tfm = NULL; |
b453872c JG |
81 | goto fail; |
82 | } | |
83 | ||
84 | return priv; | |
85 | ||
0edd5b44 | 86 | fail: |
b453872c JG |
87 | if (priv) { |
88 | if (priv->tfm) | |
f12cc209 | 89 | crypto_free_cipher(priv->tfm); |
b453872c JG |
90 | kfree(priv); |
91 | } | |
92 | ||
93 | return NULL; | |
94 | } | |
95 | ||
b453872c JG |
96 | static void ieee80211_ccmp_deinit(void *priv) |
97 | { | |
98 | struct ieee80211_ccmp_data *_priv = priv; | |
99 | if (_priv && _priv->tfm) | |
f12cc209 | 100 | crypto_free_cipher(_priv->tfm); |
b453872c JG |
101 | kfree(priv); |
102 | } | |
103 | ||
0edd5b44 | 104 | static inline void xor_block(u8 * b, u8 * a, size_t len) |
b453872c JG |
105 | { |
106 | int i; | |
107 | for (i = 0; i < len; i++) | |
108 | b[i] ^= a[i]; | |
109 | } | |
110 | ||
f12cc209 | 111 | static void ccmp_init_blocks(struct crypto_cipher *tfm, |
ee34af37 | 112 | struct ieee80211_hdr_4addr *hdr, |
0edd5b44 | 113 | u8 * pn, size_t dlen, u8 * b0, u8 * auth, u8 * s0) |
b453872c JG |
114 | { |
115 | u8 *pos, qc = 0; | |
116 | size_t aad_len; | |
117 | u16 fc; | |
118 | int a4_included, qc_included; | |
119 | u8 aad[2 * AES_BLOCK_LEN]; | |
120 | ||
121 | fc = le16_to_cpu(hdr->frame_ctl); | |
122 | a4_included = ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == | |
123 | (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)); | |
124 | qc_included = ((WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA) && | |
0df78612 | 125 | (WLAN_FC_GET_STYPE(fc) & IEEE80211_STYPE_QOS_DATA)); |
b453872c JG |
126 | aad_len = 22; |
127 | if (a4_included) | |
128 | aad_len += 6; | |
129 | if (qc_included) { | |
0edd5b44 | 130 | pos = (u8 *) & hdr->addr4; |
b453872c JG |
131 | if (a4_included) |
132 | pos += 6; | |
133 | qc = *pos & 0x0f; | |
134 | aad_len += 2; | |
135 | } | |
136 | ||
137 | /* CCM Initial Block: | |
138 | * Flag (Include authentication header, M=3 (8-octet MIC), | |
139 | * L=1 (2-octet Dlen)) | |
140 | * Nonce: 0x00 | A2 | PN | |
141 | * Dlen */ | |
142 | b0[0] = 0x59; | |
143 | b0[1] = qc; | |
144 | memcpy(b0 + 2, hdr->addr2, ETH_ALEN); | |
145 | memcpy(b0 + 8, pn, CCMP_PN_LEN); | |
146 | b0[14] = (dlen >> 8) & 0xff; | |
147 | b0[15] = dlen & 0xff; | |
148 | ||
149 | /* AAD: | |
150 | * FC with bits 4..6 and 11..13 masked to zero; 14 is always one | |
151 | * A1 | A2 | A3 | |
152 | * SC with bits 4..15 (seq#) masked to zero | |
153 | * A4 (if present) | |
154 | * QC (if present) | |
155 | */ | |
156 | pos = (u8 *) hdr; | |
0edd5b44 | 157 | aad[0] = 0; /* aad_len >> 8 */ |
b453872c JG |
158 | aad[1] = aad_len & 0xff; |
159 | aad[2] = pos[0] & 0x8f; | |
160 | aad[3] = pos[1] & 0xc7; | |
161 | memcpy(aad + 4, hdr->addr1, 3 * ETH_ALEN); | |
0edd5b44 | 162 | pos = (u8 *) & hdr->seq_ctl; |
b453872c | 163 | aad[22] = pos[0] & 0x0f; |
0edd5b44 | 164 | aad[23] = 0; /* all bits masked */ |
b453872c JG |
165 | memset(aad + 24, 0, 8); |
166 | if (a4_included) | |
167 | memcpy(aad + 24, hdr->addr4, ETH_ALEN); | |
168 | if (qc_included) { | |
169 | aad[a4_included ? 30 : 24] = qc; | |
170 | /* rest of QC masked */ | |
171 | } | |
172 | ||
173 | /* Start with the first block and AAD */ | |
174 | ieee80211_ccmp_aes_encrypt(tfm, b0, auth); | |
175 | xor_block(auth, aad, AES_BLOCK_LEN); | |
176 | ieee80211_ccmp_aes_encrypt(tfm, auth, auth); | |
177 | xor_block(auth, &aad[AES_BLOCK_LEN], AES_BLOCK_LEN); | |
178 | ieee80211_ccmp_aes_encrypt(tfm, auth, auth); | |
179 | b0[0] &= 0x07; | |
180 | b0[14] = b0[15] = 0; | |
181 | ieee80211_ccmp_aes_encrypt(tfm, b0, s0); | |
182 | } | |
183 | ||
9184d934 ZY |
184 | static int ieee80211_ccmp_hdr(struct sk_buff *skb, int hdr_len, |
185 | u8 *aeskey, int keylen, void *priv) | |
b453872c JG |
186 | { |
187 | struct ieee80211_ccmp_data *key = priv; | |
31b59eae JK |
188 | int i; |
189 | u8 *pos; | |
b453872c | 190 | |
31b59eae | 191 | if (skb_headroom(skb) < CCMP_HDR_LEN || skb->len < hdr_len) |
b453872c JG |
192 | return -1; |
193 | ||
9184d934 ZY |
194 | if (aeskey != NULL && keylen >= CCMP_TK_LEN) |
195 | memcpy(aeskey, key->key, CCMP_TK_LEN); | |
196 | ||
b453872c JG |
197 | pos = skb_push(skb, CCMP_HDR_LEN); |
198 | memmove(pos, pos + CCMP_HDR_LEN, hdr_len); | |
199 | pos += hdr_len; | |
b453872c JG |
200 | |
201 | i = CCMP_PN_LEN - 1; | |
202 | while (i >= 0) { | |
203 | key->tx_pn[i]++; | |
204 | if (key->tx_pn[i] != 0) | |
205 | break; | |
206 | i--; | |
207 | } | |
208 | ||
209 | *pos++ = key->tx_pn[5]; | |
210 | *pos++ = key->tx_pn[4]; | |
211 | *pos++ = 0; | |
0edd5b44 | 212 | *pos++ = (key->key_idx << 6) | (1 << 5) /* Ext IV included */ ; |
b453872c JG |
213 | *pos++ = key->tx_pn[3]; |
214 | *pos++ = key->tx_pn[2]; | |
215 | *pos++ = key->tx_pn[1]; | |
216 | *pos++ = key->tx_pn[0]; | |
217 | ||
31b59eae JK |
218 | return CCMP_HDR_LEN; |
219 | } | |
220 | ||
221 | static int ieee80211_ccmp_encrypt(struct sk_buff *skb, int hdr_len, void *priv) | |
222 | { | |
223 | struct ieee80211_ccmp_data *key = priv; | |
224 | int data_len, i, blocks, last, len; | |
225 | u8 *pos, *mic; | |
226 | struct ieee80211_hdr_4addr *hdr; | |
227 | u8 *b0 = key->tx_b0; | |
228 | u8 *b = key->tx_b; | |
229 | u8 *e = key->tx_e; | |
230 | u8 *s0 = key->tx_s0; | |
231 | ||
232 | if (skb_tailroom(skb) < CCMP_MIC_LEN || skb->len < hdr_len) | |
233 | return -1; | |
234 | ||
235 | data_len = skb->len - hdr_len; | |
9184d934 | 236 | len = ieee80211_ccmp_hdr(skb, hdr_len, NULL, 0, priv); |
31b59eae JK |
237 | if (len < 0) |
238 | return -1; | |
239 | ||
240 | pos = skb->data + hdr_len + CCMP_HDR_LEN; | |
241 | mic = skb_put(skb, CCMP_MIC_LEN); | |
ee34af37 | 242 | hdr = (struct ieee80211_hdr_4addr *)skb->data; |
b453872c JG |
243 | ccmp_init_blocks(key->tfm, hdr, key->tx_pn, data_len, b0, b, s0); |
244 | ||
172589cc | 245 | blocks = DIV_ROUND_UP(data_len, AES_BLOCK_LEN); |
b453872c JG |
246 | last = data_len % AES_BLOCK_LEN; |
247 | ||
248 | for (i = 1; i <= blocks; i++) { | |
249 | len = (i == blocks && last) ? last : AES_BLOCK_LEN; | |
250 | /* Authentication */ | |
251 | xor_block(b, pos, len); | |
252 | ieee80211_ccmp_aes_encrypt(key->tfm, b, b); | |
253 | /* Encryption, with counter */ | |
254 | b0[14] = (i >> 8) & 0xff; | |
255 | b0[15] = i & 0xff; | |
256 | ieee80211_ccmp_aes_encrypt(key->tfm, b0, e); | |
257 | xor_block(pos, e, len); | |
258 | pos += len; | |
259 | } | |
260 | ||
261 | for (i = 0; i < CCMP_MIC_LEN; i++) | |
262 | mic[i] = b[i] ^ s0[i]; | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
b4328d87 ZY |
267 | /* |
268 | * deal with seq counter wrapping correctly. | |
269 | * refer to timer_after() for jiffies wrapping handling | |
270 | */ | |
271 | static inline int ccmp_replay_check(u8 *pn_n, u8 *pn_o) | |
272 | { | |
273 | u32 iv32_n, iv16_n; | |
274 | u32 iv32_o, iv16_o; | |
275 | ||
276 | iv32_n = (pn_n[0] << 24) | (pn_n[1] << 16) | (pn_n[2] << 8) | pn_n[3]; | |
277 | iv16_n = (pn_n[4] << 8) | pn_n[5]; | |
278 | ||
279 | iv32_o = (pn_o[0] << 24) | (pn_o[1] << 16) | (pn_o[2] << 8) | pn_o[3]; | |
280 | iv16_o = (pn_o[4] << 8) | pn_o[5]; | |
281 | ||
282 | if ((s32)iv32_n - (s32)iv32_o < 0 || | |
283 | (iv32_n == iv32_o && iv16_n <= iv16_o)) | |
284 | return 1; | |
285 | return 0; | |
286 | } | |
287 | ||
b453872c JG |
288 | static int ieee80211_ccmp_decrypt(struct sk_buff *skb, int hdr_len, void *priv) |
289 | { | |
290 | struct ieee80211_ccmp_data *key = priv; | |
291 | u8 keyidx, *pos; | |
ee34af37 | 292 | struct ieee80211_hdr_4addr *hdr; |
b453872c JG |
293 | u8 *b0 = key->rx_b0; |
294 | u8 *b = key->rx_b; | |
295 | u8 *a = key->rx_a; | |
296 | u8 pn[6]; | |
297 | int i, blocks, last, len; | |
298 | size_t data_len = skb->len - hdr_len - CCMP_HDR_LEN - CCMP_MIC_LEN; | |
299 | u8 *mic = skb->data + skb->len - CCMP_MIC_LEN; | |
300 | ||
301 | if (skb->len < hdr_len + CCMP_HDR_LEN + CCMP_MIC_LEN) { | |
302 | key->dot11RSNAStatsCCMPFormatErrors++; | |
303 | return -1; | |
304 | } | |
305 | ||
ee34af37 | 306 | hdr = (struct ieee80211_hdr_4addr *)skb->data; |
b453872c JG |
307 | pos = skb->data + hdr_len; |
308 | keyidx = pos[3]; | |
309 | if (!(keyidx & (1 << 5))) { | |
310 | if (net_ratelimit()) { | |
311 | printk(KERN_DEBUG "CCMP: received packet without ExtIV" | |
312 | " flag from " MAC_FMT "\n", MAC_ARG(hdr->addr2)); | |
313 | } | |
314 | key->dot11RSNAStatsCCMPFormatErrors++; | |
315 | return -2; | |
316 | } | |
317 | keyidx >>= 6; | |
318 | if (key->key_idx != keyidx) { | |
319 | printk(KERN_DEBUG "CCMP: RX tkey->key_idx=%d frame " | |
320 | "keyidx=%d priv=%p\n", key->key_idx, keyidx, priv); | |
321 | return -6; | |
322 | } | |
323 | if (!key->key_set) { | |
324 | if (net_ratelimit()) { | |
325 | printk(KERN_DEBUG "CCMP: received packet from " MAC_FMT | |
326 | " with keyid=%d that does not have a configured" | |
327 | " key\n", MAC_ARG(hdr->addr2), keyidx); | |
328 | } | |
329 | return -3; | |
330 | } | |
331 | ||
332 | pn[0] = pos[7]; | |
333 | pn[1] = pos[6]; | |
334 | pn[2] = pos[5]; | |
335 | pn[3] = pos[4]; | |
336 | pn[4] = pos[1]; | |
337 | pn[5] = pos[0]; | |
338 | pos += 8; | |
339 | ||
b4328d87 | 340 | if (ccmp_replay_check(pn, key->rx_pn)) { |
b453872c | 341 | if (net_ratelimit()) { |
aeb998c1 | 342 | IEEE80211_DEBUG_DROP("CCMP: replay detected: STA=" MAC_FMT |
b453872c JG |
343 | " previous PN %02x%02x%02x%02x%02x%02x " |
344 | "received PN %02x%02x%02x%02x%02x%02x\n", | |
345 | MAC_ARG(hdr->addr2), MAC_ARG(key->rx_pn), | |
346 | MAC_ARG(pn)); | |
347 | } | |
348 | key->dot11RSNAStatsCCMPReplays++; | |
349 | return -4; | |
350 | } | |
351 | ||
352 | ccmp_init_blocks(key->tfm, hdr, pn, data_len, b0, a, b); | |
353 | xor_block(mic, b, CCMP_MIC_LEN); | |
354 | ||
172589cc | 355 | blocks = DIV_ROUND_UP(data_len, AES_BLOCK_LEN); |
b453872c JG |
356 | last = data_len % AES_BLOCK_LEN; |
357 | ||
358 | for (i = 1; i <= blocks; i++) { | |
359 | len = (i == blocks && last) ? last : AES_BLOCK_LEN; | |
360 | /* Decrypt, with counter */ | |
361 | b0[14] = (i >> 8) & 0xff; | |
362 | b0[15] = i & 0xff; | |
363 | ieee80211_ccmp_aes_encrypt(key->tfm, b0, b); | |
364 | xor_block(pos, b, len); | |
365 | /* Authentication */ | |
366 | xor_block(a, pos, len); | |
367 | ieee80211_ccmp_aes_encrypt(key->tfm, a, a); | |
368 | pos += len; | |
369 | } | |
370 | ||
371 | if (memcmp(mic, a, CCMP_MIC_LEN) != 0) { | |
372 | if (net_ratelimit()) { | |
373 | printk(KERN_DEBUG "CCMP: decrypt failed: STA=" | |
374 | MAC_FMT "\n", MAC_ARG(hdr->addr2)); | |
375 | } | |
376 | key->dot11RSNAStatsCCMPDecryptErrors++; | |
377 | return -5; | |
378 | } | |
379 | ||
380 | memcpy(key->rx_pn, pn, CCMP_PN_LEN); | |
381 | ||
382 | /* Remove hdr and MIC */ | |
383 | memmove(skb->data + CCMP_HDR_LEN, skb->data, hdr_len); | |
384 | skb_pull(skb, CCMP_HDR_LEN); | |
385 | skb_trim(skb, skb->len - CCMP_MIC_LEN); | |
386 | ||
387 | return keyidx; | |
388 | } | |
389 | ||
0edd5b44 | 390 | static int ieee80211_ccmp_set_key(void *key, int len, u8 * seq, void *priv) |
b453872c JG |
391 | { |
392 | struct ieee80211_ccmp_data *data = priv; | |
393 | int keyidx; | |
f12cc209 | 394 | struct crypto_cipher *tfm = data->tfm; |
b453872c JG |
395 | |
396 | keyidx = data->key_idx; | |
397 | memset(data, 0, sizeof(*data)); | |
398 | data->key_idx = keyidx; | |
399 | data->tfm = tfm; | |
400 | if (len == CCMP_TK_LEN) { | |
401 | memcpy(data->key, key, CCMP_TK_LEN); | |
402 | data->key_set = 1; | |
403 | if (seq) { | |
404 | data->rx_pn[0] = seq[5]; | |
405 | data->rx_pn[1] = seq[4]; | |
406 | data->rx_pn[2] = seq[3]; | |
407 | data->rx_pn[3] = seq[2]; | |
408 | data->rx_pn[4] = seq[1]; | |
409 | data->rx_pn[5] = seq[0]; | |
410 | } | |
411 | crypto_cipher_setkey(data->tfm, data->key, CCMP_TK_LEN); | |
412 | } else if (len == 0) | |
413 | data->key_set = 0; | |
414 | else | |
415 | return -1; | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
0edd5b44 | 420 | static int ieee80211_ccmp_get_key(void *key, int len, u8 * seq, void *priv) |
b453872c JG |
421 | { |
422 | struct ieee80211_ccmp_data *data = priv; | |
423 | ||
424 | if (len < CCMP_TK_LEN) | |
425 | return -1; | |
426 | ||
427 | if (!data->key_set) | |
428 | return 0; | |
429 | memcpy(key, data->key, CCMP_TK_LEN); | |
430 | ||
431 | if (seq) { | |
432 | seq[0] = data->tx_pn[5]; | |
433 | seq[1] = data->tx_pn[4]; | |
434 | seq[2] = data->tx_pn[3]; | |
435 | seq[3] = data->tx_pn[2]; | |
436 | seq[4] = data->tx_pn[1]; | |
437 | seq[5] = data->tx_pn[0]; | |
438 | } | |
439 | ||
440 | return CCMP_TK_LEN; | |
441 | } | |
442 | ||
0edd5b44 | 443 | static char *ieee80211_ccmp_print_stats(char *p, void *priv) |
b453872c JG |
444 | { |
445 | struct ieee80211_ccmp_data *ccmp = priv; | |
446 | p += sprintf(p, "key[%d] alg=CCMP key_set=%d " | |
447 | "tx_pn=%02x%02x%02x%02x%02x%02x " | |
448 | "rx_pn=%02x%02x%02x%02x%02x%02x " | |
449 | "format_errors=%d replays=%d decrypt_errors=%d\n", | |
450 | ccmp->key_idx, ccmp->key_set, | |
451 | MAC_ARG(ccmp->tx_pn), MAC_ARG(ccmp->rx_pn), | |
452 | ccmp->dot11RSNAStatsCCMPFormatErrors, | |
453 | ccmp->dot11RSNAStatsCCMPReplays, | |
454 | ccmp->dot11RSNAStatsCCMPDecryptErrors); | |
455 | ||
456 | return p; | |
457 | } | |
458 | ||
b453872c | 459 | static struct ieee80211_crypto_ops ieee80211_crypt_ccmp = { |
74079fdc JK |
460 | .name = "CCMP", |
461 | .init = ieee80211_ccmp_init, | |
462 | .deinit = ieee80211_ccmp_deinit, | |
31b59eae | 463 | .build_iv = ieee80211_ccmp_hdr, |
74079fdc JK |
464 | .encrypt_mpdu = ieee80211_ccmp_encrypt, |
465 | .decrypt_mpdu = ieee80211_ccmp_decrypt, | |
466 | .encrypt_msdu = NULL, | |
467 | .decrypt_msdu = NULL, | |
468 | .set_key = ieee80211_ccmp_set_key, | |
469 | .get_key = ieee80211_ccmp_get_key, | |
470 | .print_stats = ieee80211_ccmp_print_stats, | |
1264fc04 JK |
471 | .extra_mpdu_prefix_len = CCMP_HDR_LEN, |
472 | .extra_mpdu_postfix_len = CCMP_MIC_LEN, | |
74079fdc | 473 | .owner = THIS_MODULE, |
b453872c JG |
474 | }; |
475 | ||
b453872c JG |
476 | static int __init ieee80211_crypto_ccmp_init(void) |
477 | { | |
478 | return ieee80211_register_crypto_ops(&ieee80211_crypt_ccmp); | |
479 | } | |
480 | ||
b453872c JG |
481 | static void __exit ieee80211_crypto_ccmp_exit(void) |
482 | { | |
483 | ieee80211_unregister_crypto_ops(&ieee80211_crypt_ccmp); | |
484 | } | |
485 | ||
b453872c JG |
486 | module_init(ieee80211_crypto_ccmp_init); |
487 | module_exit(ieee80211_crypto_ccmp_exit); |