madwifi/net80211/ieee80211_crypto_ccmp.c

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/*-
* Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id$
*/
/*
* IEEE 802.11i AES-CCMP crypto support.
*
* Part of this module is derived from similar code in the Host
* AP driver. The code is used with the consent of the author and
* its license is included below.
*/
#if !defined(AUTOCONF_INCLUDED) && !defined(CONFIG_LOCALVERSION)
#include <linux/config.h>
#endif
#include <linux/version.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/crypto.h>
#include <asm/scatterlist.h>
#include "if_media.h"
#include <net80211/ieee80211_var.h>
#define AES_BLOCK_LEN 16
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
#define crypto_cipher crypto_tfm
#endif
struct ccmp_ctx {
struct ieee80211vap *cc_vap; /* for diagnostics + statistics */
struct ieee80211com *cc_ic;
struct crypto_cipher *cc_tfm;
};
static void *ccmp_attach(struct ieee80211vap *, struct ieee80211_key *);
static void ccmp_detach(struct ieee80211_key *);
static int ccmp_setkey(struct ieee80211_key *);
static int ccmp_encap(struct ieee80211_key *, struct sk_buff *, u_int8_t);
static int ccmp_decap(struct ieee80211_key *, struct sk_buff *, int);
static int ccmp_enmic(struct ieee80211_key *, struct sk_buff *, int);
static int ccmp_demic(struct ieee80211_key *, struct sk_buff *, int, int);
static const struct ieee80211_cipher ccmp = {
.ic_name = "AES-CCM",
.ic_cipher = IEEE80211_CIPHER_AES_CCM,
.ic_header = IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN +
IEEE80211_WEP_EXTIVLEN,
.ic_trailer = IEEE80211_WEP_MICLEN,
.ic_miclen = 0,
.ic_attach = ccmp_attach,
.ic_detach = ccmp_detach,
.ic_setkey = ccmp_setkey,
.ic_encap = ccmp_encap,
.ic_decap = ccmp_decap,
.ic_enmic = ccmp_enmic,
.ic_demic = ccmp_demic,
};
static int ccmp_encrypt(struct ieee80211_key *, struct sk_buff *, int);
static int ccmp_decrypt(struct ieee80211_key *, u_int64_t, struct sk_buff *, int);
static void *
ccmp_attach(struct ieee80211vap *vap, struct ieee80211_key *k)
{
struct ccmp_ctx *ctx;
int status = 1;
_MOD_INC_USE(THIS_MODULE, return NULL);
MALLOC(ctx, struct ccmp_ctx *, sizeof(struct ccmp_ctx),
M_DEVBUF, M_NOWAIT | M_ZERO);
if (ctx == NULL) {
vap->iv_stats.is_crypto_nomem++;
status = 0;
goto out;
}
/* This function crypto_alloc_foo might sleep. Therefore:
* Context: process */
if (k->wk_flags & IEEE80211_KEY_SWCRYPT) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
ctx->cc_tfm = crypto_alloc_tfm("aes", 0);
#else
ctx->cc_tfm = crypto_alloc_cipher("aes", 0,
CRYPTO_ALG_ASYNC);
if (IS_ERR(ctx->cc_tfm))
ctx->cc_tfm = NULL;
#endif
if (ctx->cc_tfm == NULL) {
printk(KERN_ERR "%s: kernel AES support is missing; "
"some modules may need to be loaded\n",
vap->iv_dev->name);
FREE(ctx, M_DEVBUF);
ctx = NULL;
vap->iv_stats.is_crypto_nocipher++;
status = 0;
}
}
out:
if (!status)
_MOD_DEC_USE(THIS_MODULE);
else {
ctx->cc_vap = vap;
ctx->cc_ic = vap->iv_ic;
}
return ctx;
}
static void
ccmp_detach(struct ieee80211_key *k)
{
struct ccmp_ctx *ctx = k->wk_private;
if (ctx->cc_tfm != NULL)
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
crypto_free_tfm(ctx->cc_tfm);
#else
crypto_free_cipher(ctx->cc_tfm);
#endif
FREE(ctx, M_DEVBUF);
_MOD_DEC_USE(THIS_MODULE);
}
static int
ccmp_setkey(struct ieee80211_key *k)
{
struct ccmp_ctx *ctx = k->wk_private;
if (k->wk_keylen != (128 / NBBY)) {
IEEE80211_DPRINTF(ctx->cc_vap, IEEE80211_MSG_CRYPTO,
"%s: Invalid key length %u, expecting %u\n",
__func__, k->wk_keylen, 128 / NBBY);
return 0;
}
if (k->wk_flags & IEEE80211_KEY_SWCRYPT)
crypto_cipher_setkey(ctx->cc_tfm, k->wk_key, k->wk_keylen);
return 1;
}
/*
* Add privacy headers appropriate for the specified key.
*/
static int
ccmp_encap(struct ieee80211_key *k, struct sk_buff *skb, u_int8_t keyid)
{
struct ccmp_ctx *ctx = k->wk_private;
struct ieee80211com *ic = ctx->cc_ic;
u_int8_t *ivp;
int hdrlen;
hdrlen = ieee80211_hdrspace(ic, skb->data);
/*
* Copy down 802.11 header and add the IV, KeyID, and ExtIV.
*/
ivp = skb_push(skb, ccmp.ic_header);
memmove(ivp, ivp + ccmp.ic_header, hdrlen);
ivp += hdrlen;
k->wk_keytsc++; /* XXX wrap at 48 bits */
ivp[0] = k->wk_keytsc >> 0; /* PN0 */
ivp[1] = k->wk_keytsc >> 8; /* PN1 */
ivp[2] = 0; /* Reserved */
ivp[3] = keyid | IEEE80211_WEP_EXTIV; /* KeyID | ExtID */
ivp[4] = k->wk_keytsc >> 16; /* PN2 */
ivp[5] = k->wk_keytsc >> 24; /* PN3 */
ivp[6] = k->wk_keytsc >> 32; /* PN4 */
ivp[7] = k->wk_keytsc >> 40; /* PN5 */
/*
* Finally, do software encrypt if needed.
*/
if ((k->wk_flags & IEEE80211_KEY_SWCRYPT) &&
!ccmp_encrypt(k, skb, hdrlen))
return 0;
return 1;
}
/*
* Add MIC to the frame as needed.
*/
static int
ccmp_enmic(struct ieee80211_key *k, struct sk_buff *skb, int force_sw)
{
return 1;
}
static __inline uint64_t
READ_6(uint8_t b0, uint8_t b1, uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5)
{
uint32_t iv32 = (b0 << 0) | (b1 << 8) | (b2 << 16) | (b3 << 24);
uint16_t iv16 = (b4 << 0) | (b5 << 8);
return (((uint64_t)iv16) << 32) | iv32;
}
/*
* Validate and strip privacy headers (and trailer) for a
* received frame. The specified key should be correct but
* is also verified.
*/
static int
ccmp_decap(struct ieee80211_key *k, struct sk_buff *skb, int hdrlen)
{
struct ccmp_ctx *ctx = k->wk_private;
struct ieee80211vap *vap = ctx->cc_vap;
struct ieee80211_frame *wh;
uint8_t *ivp;
uint64_t pn;
u_int8_t tid;
/*
* Header should have extended IV and sequence number;
* verify the former and validate the latter.
*/
wh = (struct ieee80211_frame *)skb->data;
ivp = skb->data + hdrlen;
if ((ivp[IEEE80211_WEP_IVLEN] & IEEE80211_WEP_EXTIV) == 0) {
/*
* No extended IV; discard frame.
*/
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
"%s", "Missing ExtIV for AES-CCM cipher");
vap->iv_stats.is_rx_ccmpformat++;
return 0;
}
tid = 0;
if (IEEE80211_QOS_HAS_SEQ(wh))
tid = ((struct ieee80211_qosframe *)wh)->i_qos[0] & IEEE80211_QOS_TID;
/* NB: assume IEEE80211_WEP_MINLEN covers the extended IV */
pn = READ_6(ivp[0], ivp[1], ivp[4], ivp[5], ivp[6], ivp[7]);
if (pn && pn <= k->wk_keyrsc[tid]) {
/*
* Replay violation.
*/
ieee80211_notify_replay_failure(vap, wh, k, pn);
vap->iv_stats.is_rx_ccmpreplay++;
return 0;
}
/*
* Check if the device handled the decrypt in hardware.
* If so we just strip the header; otherwise we need to
* handle the decrypt in software. Note that for the
* latter we leave the header in place for use in the
* decryption work.
*/
if ((k->wk_flags & IEEE80211_KEY_SWCRYPT) &&
!ccmp_decrypt(k, pn, skb, hdrlen))
return 0;
/*
* Copy up 802.11 header and strip crypto bits.
*/
memmove(skb->data + ccmp.ic_header, skb->data, hdrlen);
skb_pull(skb, ccmp.ic_header);
while (skb->next != NULL)
skb = skb->next;
skb_trim(skb, skb->len - ccmp.ic_trailer);
/*
* Ok to update rsc now.
*/
k->wk_keyrsc[tid] = pn;
return 1;
}
/*
* Verify and strip MIC from the frame.
*/
static int
ccmp_demic(struct ieee80211_key *k, struct sk_buff *skb, int hdrlen, int force_sw)
{
return 1;
}
static __inline void
xor_block(u8 *b, const u8 *a, size_t len)
{
int i;
for (i = 0; i < len; i++)
b[i] ^= a[i];
}
static void
rijndael_encrypt(struct crypto_cipher *tfm, const void *src, void *dst)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)
crypto_cipher_encrypt_one(tfm, dst, src);
#else
struct scatterlist sg_src;
struct scatterlist sg_dst;
sg_src.page = virt_to_page(src);
sg_src.offset = offset_in_page(src);
sg_src.length = AES_BLOCK_LEN;
sg_dst.page = virt_to_page(dst);
sg_dst.offset = offset_in_page(dst);
sg_dst.length = AES_BLOCK_LEN;
crypto_cipher_encrypt(tfm, &sg_dst, &sg_src, AES_BLOCK_LEN);
#endif
}
/*
* Host AP crypt: host-based CCMP encryption implementation for Host AP driver
*
* Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation. See README and COPYING for
* more details.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*/
static void
ccmp_init_blocks(struct crypto_cipher *tfm, struct ieee80211_frame *wh,
u_int64_t pn, size_t dlen,
uint8_t b0[AES_BLOCK_LEN], uint8_t aad[2 * AES_BLOCK_LEN],
uint8_t auth[AES_BLOCK_LEN], uint8_t s0[AES_BLOCK_LEN])
{
#define IS_4ADDRESS(wh) \
((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS)
#define IS_QOS_DATA(wh) IEEE80211_QOS_HAS_SEQ(wh)
/* CCM Initial Block:
* Flag (Include authentication header, M=3 (8-octet MIC),
* L=1 (2-octet Dlen))
* Nonce: 0x00 | A2 | PN
* Dlen */
b0[0] = 0x59;
/* NB: b0[1] set below */
IEEE80211_ADDR_COPY(b0 + 2, wh->i_addr2);
b0[8] = pn >> 40;
b0[9] = pn >> 32;
b0[10] = pn >> 24;
b0[11] = pn >> 16;
b0[12] = pn >> 8;
b0[13] = pn >> 0;
b0[14] = (dlen >> 8) & 0xff;
b0[15] = dlen & 0xff;
/* AAD:
* FC with bits 4..6 and 11..13 masked to zero; 14 is always one
* A1 | A2 | A3
* SC with bits 4..15 (seq#) masked to zero
* A4 (if present)
* QC (if present)
*/
aad[0] = 0; /* AAD length >> 8 */
/* NB: aad[1] set below */
aad[2] = wh->i_fc[0] & 0x8f; /* XXX magic #s */
aad[3] = wh->i_fc[1] & 0xc7; /* XXX magic #s */
/* NB: we know 3 addresses are contiguous */
memcpy(aad + 4, wh->i_addr1, 3 * IEEE80211_ADDR_LEN);
aad[22] = wh->i_seq[0] & IEEE80211_SEQ_FRAG_MASK;
aad[23] = 0; /* all bits masked */
/*
* Construct variable-length portion of AAD based
* on whether this is a 4-address frame/QOS frame.
* We always zero-pad to 32 bytes before running it
* through the cipher.
*
* We also fill in the priority bits of the CCM
* initial block as we know whether or not we have
* a QOS frame.
*/
if (IS_4ADDRESS(wh)) {
IEEE80211_ADDR_COPY(aad + 24,
((struct ieee80211_frame_addr4 *)wh)->i_addr4);
if (IS_QOS_DATA(wh)) {
struct ieee80211_qosframe_addr4 *qwh4 =
(struct ieee80211_qosframe_addr4 *)wh;
aad[30] = qwh4->i_qos[0] & 0x0f;/* just priority bits */
aad[31] = 0;
b0[1] = aad[30];
aad[1] = 22 + IEEE80211_ADDR_LEN + 2;
} else {
*(u_int16_t *)&aad[30] = 0;
b0[1] = 0;
aad[1] = 22 + IEEE80211_ADDR_LEN;
}
} else {
if (IS_QOS_DATA(wh)) {
struct ieee80211_qosframe *qwh =
(struct ieee80211_qosframe *)wh;
aad[24] = qwh->i_qos[0] & 0x0f; /* just priority bits */
aad[25] = 0;
b0[1] = aad[24];
aad[1] = 22 + 2;
} else {
*(u_int16_t *)&aad[24] = 0;
b0[1] = 0;
aad[1] = 22;
}
*(u_int16_t *)&aad[26] = 0;
*(u_int32_t *)&aad[28] = 0;
}
/* Start with the first block and AAD */
rijndael_encrypt(tfm, b0, auth);
xor_block(auth, aad, AES_BLOCK_LEN);
rijndael_encrypt(tfm, auth, auth);
xor_block(auth, &aad[AES_BLOCK_LEN], AES_BLOCK_LEN);
rijndael_encrypt(tfm, auth, auth);
b0[0] &= 0x07;
b0[14] = b0[15] = 0;
rijndael_encrypt(tfm, b0, s0);
#undef IS_QOS_DATA
#undef IS_4ADDRESS
}
#define CCMP_ENCRYPT(_i, _b, _b0, _pos, _e, _len) do { \
/* Authentication */ \
xor_block(_b, _pos, _len); \
rijndael_encrypt(ctx->cc_tfm, _b, _b); \
/* Encryption, with counter */ \
_b0[14] = (_i >> 8) & 0xff; \
_b0[15] = _i & 0xff; \
rijndael_encrypt(ctx->cc_tfm, _b0, _e); \
xor_block(_pos, _e, _len); \
} while (0)
static int
ccmp_encrypt(struct ieee80211_key *key, struct sk_buff *skb0, int hdrlen)
{
struct ccmp_ctx *ctx = key->wk_private;
struct ieee80211_frame *wh = (struct ieee80211_frame *)skb0->data;
struct sk_buff *skb;
int data_len, i;
uint8_t aad[2 * AES_BLOCK_LEN], b0[AES_BLOCK_LEN], b[AES_BLOCK_LEN];
uint8_t e[AES_BLOCK_LEN], s0[AES_BLOCK_LEN];
uint8_t *mic, *pos;
u_int space;
ctx->cc_vap->iv_stats.is_crypto_ccmp++;
skb = skb0;
data_len = skb->len;
while (skb->next != NULL) {
skb = skb->next;
data_len += skb->len;
}
data_len -= hdrlen + ccmp.ic_header;
if (skb_tailroom(skb) < ccmp.ic_trailer) {
/* NB: should not happen */
IEEE80211_NOTE_MAC(ctx->cc_vap, IEEE80211_MSG_CRYPTO,
wh->i_addr1, "No room for %s MIC, tailroom %u",
ccmp.ic_name, skb_tailroom(skb));
/* XXX statistic */
return 0;
}
ccmp_init_blocks(ctx->cc_tfm, wh, key->wk_keytsc,
data_len, b0, aad, b, s0);
i = 1;
skb = skb0;
pos = skb->data + hdrlen + ccmp.ic_header;
/* NB: assumes header is entirely in first skbuf */
space = skb->len - (hdrlen + ccmp.ic_header);
for (;;) {
if (space > data_len)
space = data_len;
/*
* Do full blocks.
*/
while (space >= AES_BLOCK_LEN) {
CCMP_ENCRYPT(i, b, b0, pos, e, AES_BLOCK_LEN);
pos += AES_BLOCK_LEN, space -= AES_BLOCK_LEN;
data_len -= AES_BLOCK_LEN;
i++;
}
if (data_len <= 0) /* no more data */
break;
if (skb->next == NULL) { /* last buffer */
if (space != 0) {
/*
* Short last block.
*/
CCMP_ENCRYPT(i, b, b0, pos, e, space);
}
break;
}
skb = skb->next;
if (space != 0) {
uint8_t *pos_next;
u_int space_next;
u_int len;
/*
* Block straddles buffers, split references. We
* do not handle splits that require >2 buffers.
*/
pos_next = skb->data;
len = min(data_len, AES_BLOCK_LEN);
space_next = len > space ? len - space : 0;
KASSERT(skb->len >= space_next,
("not enough data in following buffer, "
"skb len %u need %u", skb->len, space_next));
xor_block(b + space, pos_next, space_next);
CCMP_ENCRYPT(i, b, b0, pos, e, space);
xor_block(pos_next, e + space, space_next);
data_len -= len;
/* XXX could check for data_len <= 0 */
i++;
pos = pos_next + space_next;
space = skb->len - space_next;
} else {
/*
* Setup for next buffer.
*/
pos = skb->data;
space = skb->len;
}
}
/* tack on MIC */
mic = skb_put(skb, ccmp.ic_trailer);
for (i = 0; i < ccmp.ic_trailer; i++)
mic[i] = b[i] ^ s0[i];
return 1;
}
#undef CCMP_ENCRYPT
#define CCMP_DECRYPT(_i, _b, _b0, _pos, _a, _len) do { \
/* Decrypt, with counter */ \
_b0[14] = (_i >> 8) & 0xff; \
_b0[15] = _i & 0xff; \
rijndael_encrypt(ctx->cc_tfm, _b0, _b); \
xor_block(_pos, _b, _len); \
/* Authentication */ \
xor_block(_a, _pos, _len); \
rijndael_encrypt(ctx->cc_tfm, _a, _a); \
} while (0)
static int
ccmp_decrypt(struct ieee80211_key *key, u_int64_t pn, struct sk_buff *skb0, int hdrlen)
{
struct ccmp_ctx *ctx = key->wk_private;
struct ieee80211_frame *wh = (struct ieee80211_frame *)skb0->data;
struct sk_buff *skb;
uint8_t aad[2 * AES_BLOCK_LEN];
uint8_t b0[AES_BLOCK_LEN], b[AES_BLOCK_LEN], a[AES_BLOCK_LEN];
size_t data_len;
int i;
uint8_t *pos, *mic;
u_int space;
ctx->cc_vap->iv_stats.is_crypto_ccmp++;
skb = skb0;
data_len = skb->len;
while (skb->next != NULL) {
skb = skb->next;
data_len += skb->len;
}
data_len -= hdrlen + ccmp.ic_header + ccmp.ic_trailer;
/* NB: skb left pointing at last in chain */
ccmp_init_blocks(ctx->cc_tfm, wh, pn, data_len, b0, aad, a, b);
/* NB: this is the last in the chain */
/* XXX assert skb->len >= ccmp.ic_trailer */
mic = skb->data + skb->len - ccmp.ic_trailer;
xor_block(mic, b, ccmp.ic_trailer);
i = 1;
skb = skb0;
pos = skb->data + hdrlen + ccmp.ic_header;
space = skb->len - (hdrlen + ccmp.ic_header);
for (;;) {
if (space > data_len)
space = data_len;
while (space >= AES_BLOCK_LEN) {
CCMP_DECRYPT(i, b, b0, pos, a, AES_BLOCK_LEN);
pos += AES_BLOCK_LEN;
space -= AES_BLOCK_LEN;
data_len -= AES_BLOCK_LEN;
i++;
}
if (data_len <= 0) /* no more data */
break;
skb = skb->next;
if (skb == NULL) { /* last buffer */
if (space != 0) /* short last block */
CCMP_DECRYPT(i, b, b0, pos, a, space);
break;
}
if (space != 0) {
uint8_t *pos_next;
u_int space_next;
u_int len;
/*
* Block straddles buffers, split references. We
* do not handle splits that require >2 buffers.
*/
pos_next = skb->data;
len = min(data_len, (size_t) AES_BLOCK_LEN);
space_next = len > space ? len - space : 0;
KASSERT(skb->len >= space_next,
("not enough data in following buffer, "
"skb len %u need %u", skb->len, space_next));
xor_block(b+space, pos_next, space_next);
CCMP_DECRYPT(i, b, b0, pos, a, space);
xor_block(pos_next, b+space, space_next);
data_len -= len;
i++;
pos = pos_next + space_next;
space = skb->len - space_next;
} else {
/*
* Setup for next buffer.
*/
pos = skb->data;
space = skb->len;
}
}
if (memcmp(mic, a, ccmp.ic_trailer) != 0) {
IEEE80211_NOTE_MAC(ctx->cc_vap, IEEE80211_MSG_CRYPTO,
wh->i_addr2,
"AES-CCM decrypt failed; MIC mismatch (keyix %u, rsc %llu)",
key->wk_keyix, (unsigned long long)pn);
ctx->cc_vap->iv_stats.is_rx_ccmpmic++;
return 0;
}
return 1;
}
#undef CCMP_DECRYPT
/*
* Module glue.
*/
MODULE_AUTHOR("Errno Consulting, Sam Leffler");
MODULE_DESCRIPTION("802.11 wireless support: AES-CCM cipher");
#ifdef MODULE_LICENSE
MODULE_LICENSE("Dual BSD/GPL");
#endif
static int __init
init_crypto_ccmp(void)
{
ieee80211_crypto_register(&ccmp);
return 0;
}
module_init(init_crypto_ccmp);
static void __exit
exit_crypto_ccmp(void)
{
ieee80211_crypto_unregister(&ccmp);
}
module_exit(exit_crypto_ccmp);