606 lines
16 KiB
C
606 lines
16 KiB
C
/*-
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* 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
|
|
* it's license is included below.
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
|
|
#include <sys/socket.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_media.h>
|
|
#include <net/ethernet.h>
|
|
|
|
#include <net80211/ieee80211_var.h>
|
|
|
|
#include <crypto/rijndael/rijndael.h>
|
|
|
|
#define AES_BLOCK_LEN 16
|
|
|
|
struct ccmp_ctx {
|
|
struct ieee80211com *cc_ic; /* for diagnostics */
|
|
rijndael_ctx cc_aes;
|
|
};
|
|
|
|
static void *ccmp_attach(struct ieee80211com *, struct ieee80211_key *);
|
|
static void ccmp_detach(struct ieee80211_key *);
|
|
static int ccmp_setkey(struct ieee80211_key *);
|
|
static int ccmp_encap(struct ieee80211_key *k, struct mbuf *, u_int8_t keyid);
|
|
static int ccmp_decap(struct ieee80211_key *, struct mbuf *);
|
|
static int ccmp_enmic(struct ieee80211_key *, struct mbuf *);
|
|
static int ccmp_demic(struct ieee80211_key *, struct mbuf *);
|
|
|
|
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 mbuf *, int hdrlen);
|
|
static int ccmp_decrypt(struct ieee80211_key *, u_int64_t pn,
|
|
struct mbuf *, int hdrlen);
|
|
|
|
static void *
|
|
ccmp_attach(struct ieee80211com *ic, struct ieee80211_key *k)
|
|
{
|
|
struct ccmp_ctx *ctx;
|
|
|
|
MALLOC(ctx, struct ccmp_ctx *, sizeof(struct ccmp_ctx),
|
|
M_DEVBUF, M_NOWAIT | M_ZERO);
|
|
if (ctx == NULL) {
|
|
ic->ic_stats.is_crypto_nomem++;
|
|
return NULL;
|
|
}
|
|
ctx->cc_ic = ic;
|
|
return ctx;
|
|
}
|
|
|
|
static void
|
|
ccmp_detach(struct ieee80211_key *k)
|
|
{
|
|
struct ccmp_ctx *ctx = k->wk_private;
|
|
|
|
FREE(ctx, M_DEVBUF);
|
|
}
|
|
|
|
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_ic, 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)
|
|
rijndael_set_key(&ctx->cc_aes, k->wk_key, k->wk_keylen*NBBY);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Add privacy headers appropriate for the specified key.
|
|
*/
|
|
static int
|
|
ccmp_encap(struct ieee80211_key *k, struct mbuf *m, 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, mtod(m, void *));
|
|
|
|
/*
|
|
* Copy down 802.11 header and add the IV, KeyID, and ExtIV.
|
|
*/
|
|
M_PREPEND(m, ccmp.ic_header, M_NOWAIT);
|
|
if (m == NULL)
|
|
return 0;
|
|
ivp = mtod(m, u_int8_t *);
|
|
ovbcopy(ivp + ccmp.ic_header, ivp, 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 neeed.
|
|
*/
|
|
if ((k->wk_flags & IEEE80211_KEY_SWCRYPT) &&
|
|
!ccmp_encrypt(k, m, hdrlen))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Add MIC to the frame as needed.
|
|
*/
|
|
static int
|
|
ccmp_enmic(struct ieee80211_key *k, struct mbuf *m)
|
|
{
|
|
|
|
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 mbuf *m)
|
|
{
|
|
struct ccmp_ctx *ctx = k->wk_private;
|
|
struct ieee80211_frame *wh;
|
|
uint8_t *ivp;
|
|
uint64_t pn;
|
|
int hdrlen;
|
|
|
|
/*
|
|
* Header should have extended IV and sequence number;
|
|
* verify the former and validate the latter.
|
|
*/
|
|
wh = mtod(m, struct ieee80211_frame *);
|
|
hdrlen = ieee80211_hdrsize(wh);
|
|
ivp = mtod(m, uint8_t *) + hdrlen;
|
|
if ((ivp[IEEE80211_WEP_IVLEN] & IEEE80211_WEP_EXTIV) == 0) {
|
|
/*
|
|
* No extended IV; discard frame.
|
|
*/
|
|
IEEE80211_DPRINTF(ctx->cc_ic, IEEE80211_MSG_CRYPTO,
|
|
"[%s] Missing ExtIV for AES-CCM cipher\n",
|
|
ether_sprintf(wh->i_addr2));
|
|
ctx->cc_ic->ic_stats.is_rx_ccmpformat++;
|
|
return 0;
|
|
}
|
|
pn = READ_6(ivp[0], ivp[1], ivp[4], ivp[5], ivp[6], ivp[7]);
|
|
if (pn <= k->wk_keyrsc) {
|
|
/*
|
|
* Replay violation.
|
|
*/
|
|
ieee80211_notify_replay_failure(ctx->cc_ic, wh, k, pn);
|
|
ctx->cc_ic->ic_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, m, hdrlen))
|
|
return 0;
|
|
|
|
/*
|
|
* Copy up 802.11 header and strip crypto bits.
|
|
*/
|
|
ovbcopy(mtod(m, void *), mtod(m, u_int8_t *) + ccmp.ic_header, hdrlen);
|
|
m_adj(m, ccmp.ic_header);
|
|
m_adj(m, -ccmp.ic_trailer);
|
|
|
|
/*
|
|
* Ok to update rsc now.
|
|
*/
|
|
k->wk_keyrsc = pn;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Verify and strip MIC from the frame.
|
|
*/
|
|
static int
|
|
ccmp_demic(struct ieee80211_key *k, struct mbuf *m)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static __inline void
|
|
xor_block(uint8_t *b, const uint8_t *a, size_t len)
|
|
{
|
|
int i;
|
|
for (i = 0; i < len; i++)
|
|
b[i] ^= a[i];
|
|
}
|
|
|
|
/*
|
|
* 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(rijndael_ctx *ctx, 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(ctx, b0, auth);
|
|
xor_block(auth, aad, AES_BLOCK_LEN);
|
|
rijndael_encrypt(ctx, auth, auth);
|
|
xor_block(auth, &aad[AES_BLOCK_LEN], AES_BLOCK_LEN);
|
|
rijndael_encrypt(ctx, auth, auth);
|
|
b0[0] &= 0x07;
|
|
b0[14] = b0[15] = 0;
|
|
rijndael_encrypt(ctx, 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_aes, _b, _b); \
|
|
/* Encryption, with counter */ \
|
|
_b0[14] = (_i >> 8) & 0xff; \
|
|
_b0[15] = _i & 0xff; \
|
|
rijndael_encrypt(&ctx->cc_aes, _b0, _e); \
|
|
xor_block(_pos, _e, _len); \
|
|
} while (0)
|
|
|
|
static int
|
|
ccmp_encrypt(struct ieee80211_key *key, struct mbuf *m0, int hdrlen)
|
|
{
|
|
struct ccmp_ctx *ctx = key->wk_private;
|
|
struct ieee80211_frame *wh;
|
|
struct mbuf *m = m0;
|
|
int data_len, i;
|
|
uint8_t aad[2 * AES_BLOCK_LEN], b0[AES_BLOCK_LEN], b[AES_BLOCK_LEN],
|
|
e[AES_BLOCK_LEN], s0[AES_BLOCK_LEN];
|
|
uint8_t *pos;
|
|
u_int space;
|
|
|
|
ctx->cc_ic->ic_stats.is_crypto_ccmp++;
|
|
|
|
wh = mtod(m, struct ieee80211_frame *);
|
|
data_len = m->m_pkthdr.len - (hdrlen + ccmp.ic_header);
|
|
ccmp_init_blocks(&ctx->cc_aes, wh, key->wk_keytsc,
|
|
data_len, b0, aad, b, s0);
|
|
|
|
i = 1;
|
|
pos = mtod(m, uint8_t *) + hdrlen + ccmp.ic_header;
|
|
/* NB: assumes header is entirely in first mbuf */
|
|
space = m->m_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;
|
|
m = m->m_next;
|
|
if (m == NULL) { /* last buffer */
|
|
if (space != 0) {
|
|
/*
|
|
* Short last block.
|
|
*/
|
|
CCMP_ENCRYPT(i, b, b0, pos, e, 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 = mtod(m, uint8_t *);
|
|
len = min(data_len, AES_BLOCK_LEN);
|
|
space_next = len > space ? len - space : 0;
|
|
KASSERT(m->m_len >= space_next,
|
|
("not enough data in following buffer, "
|
|
"m_len %u need %u\n", m->m_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 = m->m_len - space_next;
|
|
} else {
|
|
/*
|
|
* Setup for next buffer.
|
|
*/
|
|
pos = mtod(m, uint8_t *);
|
|
space = m->m_len;
|
|
}
|
|
}
|
|
/* tack on MIC */
|
|
xor_block(b, s0, ccmp.ic_trailer);
|
|
return m_append(m0, ccmp.ic_trailer, b);
|
|
}
|
|
#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_aes, _b0, _b); \
|
|
xor_block(_pos, _b, _len); \
|
|
/* Authentication */ \
|
|
xor_block(_a, _pos, _len); \
|
|
rijndael_encrypt(&ctx->cc_aes, _a, _a); \
|
|
} while (0)
|
|
|
|
static int
|
|
ccmp_decrypt(struct ieee80211_key *key, u_int64_t pn, struct mbuf *m, int hdrlen)
|
|
{
|
|
struct ccmp_ctx *ctx = key->wk_private;
|
|
struct ieee80211_frame *wh;
|
|
uint8_t aad[2 * AES_BLOCK_LEN];
|
|
uint8_t b0[AES_BLOCK_LEN], b[AES_BLOCK_LEN], a[AES_BLOCK_LEN];
|
|
uint8_t mic[AES_BLOCK_LEN];
|
|
size_t data_len;
|
|
int i;
|
|
uint8_t *pos;
|
|
u_int space;
|
|
|
|
ctx->cc_ic->ic_stats.is_crypto_ccmp++;
|
|
|
|
wh = mtod(m, struct ieee80211_frame *);
|
|
data_len = m->m_pkthdr.len - (hdrlen + ccmp.ic_header + ccmp.ic_trailer);
|
|
ccmp_init_blocks(&ctx->cc_aes, wh, pn, data_len, b0, aad, a, b);
|
|
m_copydata(m, m->m_pkthdr.len - ccmp.ic_trailer, ccmp.ic_trailer, mic);
|
|
xor_block(mic, b, ccmp.ic_trailer);
|
|
|
|
i = 1;
|
|
pos = mtod(m, uint8_t *) + hdrlen + ccmp.ic_header;
|
|
space = m->m_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;
|
|
m = m->m_next;
|
|
if (m == 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 = mtod(m, uint8_t *);
|
|
len = min(data_len, AES_BLOCK_LEN);
|
|
space_next = len > space ? len - space : 0;
|
|
KASSERT(m->m_len >= space_next,
|
|
("not enough data in following buffer, "
|
|
"m_len %u need %u\n", m->m_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 = m->m_len - space_next;
|
|
} else {
|
|
/*
|
|
* Setup for next buffer.
|
|
*/
|
|
pos = mtod(m, uint8_t *);
|
|
space = m->m_len;
|
|
}
|
|
}
|
|
if (memcmp(mic, a, ccmp.ic_trailer) != 0) {
|
|
IEEE80211_DPRINTF(ctx->cc_ic, IEEE80211_MSG_CRYPTO,
|
|
"[%s] AES-CCM decrypt failed; MIC mismatch\n",
|
|
ether_sprintf(wh->i_addr2));
|
|
ctx->cc_ic->ic_stats.is_rx_ccmpmic++;
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
#undef CCMP_DECRYPT
|
|
|
|
/*
|
|
* Module glue.
|
|
*/
|
|
static int
|
|
ccmp_modevent(module_t mod, int type, void *unused)
|
|
{
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
ieee80211_crypto_register(&ccmp);
|
|
return 0;
|
|
case MOD_UNLOAD:
|
|
ieee80211_crypto_unregister(&ccmp);
|
|
return 0;
|
|
}
|
|
return EINVAL;
|
|
}
|
|
|
|
static moduledata_t ccmp_mod = {
|
|
"wlan_ccmp",
|
|
ccmp_modevent,
|
|
0
|
|
};
|
|
DECLARE_MODULE(wlan_ccmp, ccmp_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
|
|
MODULE_VERSION(wlan_ccmp, 1);
|
|
MODULE_DEPEND(wlan_ccmp, wlan, 1, 1, 1);
|