78a6b08618
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
684 lines
18 KiB
C
684 lines
18 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2002-2008 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.
|
|
*
|
|
* 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 "opt_wlan.h"
|
|
|
|
#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 ieee80211vap *cc_vap; /* for diagnostics+statistics */
|
|
struct ieee80211com *cc_ic;
|
|
rijndael_ctx cc_aes;
|
|
};
|
|
|
|
static void *ccmp_attach(struct ieee80211vap *, struct ieee80211_key *);
|
|
static void ccmp_detach(struct ieee80211_key *);
|
|
static int ccmp_setkey(struct ieee80211_key *);
|
|
static void ccmp_setiv(struct ieee80211_key *, uint8_t *);
|
|
static int ccmp_encap(struct ieee80211_key *, struct mbuf *);
|
|
static int ccmp_decap(struct ieee80211_key *, struct mbuf *, int);
|
|
static int ccmp_enmic(struct ieee80211_key *, struct mbuf *, int);
|
|
static int ccmp_demic(struct ieee80211_key *, struct mbuf *, 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_setiv = ccmp_setiv,
|
|
.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);
|
|
|
|
/* number of references from net80211 layer */
|
|
static int nrefs = 0;
|
|
|
|
static void *
|
|
ccmp_attach(struct ieee80211vap *vap, struct ieee80211_key *k)
|
|
{
|
|
struct ccmp_ctx *ctx;
|
|
|
|
ctx = (struct ccmp_ctx *) IEEE80211_MALLOC(sizeof(struct ccmp_ctx),
|
|
M_80211_CRYPTO, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
|
|
if (ctx == NULL) {
|
|
vap->iv_stats.is_crypto_nomem++;
|
|
return NULL;
|
|
}
|
|
ctx->cc_vap = vap;
|
|
ctx->cc_ic = vap->iv_ic;
|
|
nrefs++; /* NB: we assume caller locking */
|
|
return ctx;
|
|
}
|
|
|
|
static void
|
|
ccmp_detach(struct ieee80211_key *k)
|
|
{
|
|
struct ccmp_ctx *ctx = k->wk_private;
|
|
|
|
IEEE80211_FREE(ctx, M_80211_CRYPTO);
|
|
KASSERT(nrefs > 0, ("imbalanced attach/detach"));
|
|
nrefs--; /* NB: we assume caller locking */
|
|
}
|
|
|
|
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_SWENCRYPT)
|
|
rijndael_set_key(&ctx->cc_aes, k->wk_key, k->wk_keylen*NBBY);
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
ccmp_setiv(struct ieee80211_key *k, uint8_t *ivp)
|
|
{
|
|
struct ccmp_ctx *ctx = k->wk_private;
|
|
struct ieee80211vap *vap = ctx->cc_vap;
|
|
uint8_t keyid;
|
|
|
|
keyid = ieee80211_crypto_get_keyid(vap, k) << 6;
|
|
|
|
k->wk_keytsc++;
|
|
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 */
|
|
}
|
|
|
|
/*
|
|
* Add privacy headers appropriate for the specified key.
|
|
*/
|
|
static int
|
|
ccmp_encap(struct ieee80211_key *k, struct mbuf *m)
|
|
{
|
|
const struct ieee80211_frame *wh;
|
|
struct ccmp_ctx *ctx = k->wk_private;
|
|
struct ieee80211com *ic = ctx->cc_ic;
|
|
uint8_t *ivp;
|
|
int hdrlen;
|
|
int is_mgmt;
|
|
|
|
hdrlen = ieee80211_hdrspace(ic, mtod(m, void *));
|
|
wh = mtod(m, const struct ieee80211_frame *);
|
|
is_mgmt = IEEE80211_IS_MGMT(wh);
|
|
|
|
/*
|
|
* Check to see if we need to insert IV/MIC.
|
|
*
|
|
* Some offload devices don't require the IV to be inserted
|
|
* as part of the hardware encryption.
|
|
*/
|
|
if (is_mgmt && (k->wk_flags & IEEE80211_KEY_NOIVMGT))
|
|
return 1;
|
|
if ((! is_mgmt) && (k->wk_flags & IEEE80211_KEY_NOIV))
|
|
return 1;
|
|
|
|
/*
|
|
* 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, uint8_t *);
|
|
ovbcopy(ivp + ccmp.ic_header, ivp, hdrlen);
|
|
ivp += hdrlen;
|
|
|
|
ccmp_setiv(k, ivp);
|
|
|
|
/*
|
|
* Finally, do software encrypt if needed.
|
|
*/
|
|
if ((k->wk_flags & IEEE80211_KEY_SWENCRYPT) &&
|
|
!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, int force)
|
|
{
|
|
|
|
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, int hdrlen)
|
|
{
|
|
const struct ieee80211_rx_stats *rxs;
|
|
struct ccmp_ctx *ctx = k->wk_private;
|
|
struct ieee80211vap *vap = ctx->cc_vap;
|
|
struct ieee80211_frame *wh;
|
|
uint8_t *ivp, tid;
|
|
uint64_t pn;
|
|
|
|
rxs = ieee80211_get_rx_params_ptr(m);
|
|
|
|
if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_IV_STRIP))
|
|
goto finish;
|
|
|
|
/*
|
|
* Header should have extended IV and sequence number;
|
|
* verify the former and validate the latter.
|
|
*/
|
|
wh = mtod(m, struct ieee80211_frame *);
|
|
ivp = mtod(m, uint8_t *) + 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 = ieee80211_gettid(wh);
|
|
pn = READ_6(ivp[0], ivp[1], ivp[4], ivp[5], ivp[6], ivp[7]);
|
|
if (pn <= k->wk_keyrsc[tid] &&
|
|
(k->wk_flags & IEEE80211_KEY_NOREPLAY) == 0) {
|
|
/*
|
|
* Replay violation.
|
|
*/
|
|
ieee80211_notify_replay_failure(vap, wh, k, pn, tid);
|
|
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_SWDECRYPT) &&
|
|
!ccmp_decrypt(k, pn, m, hdrlen))
|
|
return 0;
|
|
|
|
finish:
|
|
/*
|
|
* Copy up 802.11 header and strip crypto bits.
|
|
*/
|
|
if (! ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_IV_STRIP))) {
|
|
ovbcopy(mtod(m, void *), mtod(m, uint8_t *) + ccmp.ic_header,
|
|
hdrlen);
|
|
m_adj(m, ccmp.ic_header);
|
|
}
|
|
|
|
/*
|
|
* XXX TODO: see if MMIC_STRIP also covers CCMP MIC trailer.
|
|
*/
|
|
if (! ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_MMIC_STRIP)))
|
|
m_adj(m, -ccmp.ic_trailer);
|
|
|
|
/*
|
|
* Ok to update rsc now.
|
|
*/
|
|
if (! ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_IV_STRIP))) {
|
|
k->wk_keyrsc[tid] = pn;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Verify and strip MIC from the frame.
|
|
*/
|
|
static int
|
|
ccmp_demic(struct ieee80211_key *k, struct mbuf *m, int force)
|
|
{
|
|
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_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 (IEEE80211_IS_DSTODS(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 {
|
|
*(uint16_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 {
|
|
*(uint16_t *)&aad[24] = 0;
|
|
b0[1] = 0;
|
|
aad[1] = 22;
|
|
}
|
|
*(uint16_t *)&aad[26] = 0;
|
|
*(uint32_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
|
|
}
|
|
|
|
#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, space;
|
|
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;
|
|
|
|
ctx->cc_vap->iv_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;
|
|
int space_next;
|
|
int len, dl, sp;
|
|
struct mbuf *n;
|
|
|
|
/*
|
|
* Block straddles one or more mbufs, gather data
|
|
* into the block buffer b, apply the cipher, then
|
|
* scatter the results back into the mbuf chain.
|
|
* The buffer will automatically get space bytes
|
|
* of data at offset 0 copied in+out by the
|
|
* CCMP_ENCRYPT request so we must take care of
|
|
* the remaining data.
|
|
*/
|
|
n = m;
|
|
dl = data_len;
|
|
sp = space;
|
|
for (;;) {
|
|
pos_next = mtod(n, uint8_t *);
|
|
len = min(dl, AES_BLOCK_LEN);
|
|
space_next = len > sp ? len - sp : 0;
|
|
if (n->m_len >= space_next) {
|
|
/*
|
|
* This mbuf has enough data; just grab
|
|
* what we need and stop.
|
|
*/
|
|
xor_block(b+sp, pos_next, space_next);
|
|
break;
|
|
}
|
|
/*
|
|
* This mbuf's contents are insufficient,
|
|
* take 'em all and prepare to advance to
|
|
* the next mbuf.
|
|
*/
|
|
xor_block(b+sp, pos_next, n->m_len);
|
|
sp += n->m_len, dl -= n->m_len;
|
|
n = n->m_next;
|
|
if (n == NULL)
|
|
break;
|
|
}
|
|
|
|
CCMP_ENCRYPT(i, b, b0, pos, e, space);
|
|
|
|
/* NB: just like above, but scatter data to mbufs */
|
|
dl = data_len;
|
|
sp = space;
|
|
for (;;) {
|
|
pos_next = mtod(m, uint8_t *);
|
|
len = min(dl, AES_BLOCK_LEN);
|
|
space_next = len > sp ? len - sp : 0;
|
|
if (m->m_len >= space_next) {
|
|
xor_block(pos_next, e+sp, space_next);
|
|
break;
|
|
}
|
|
xor_block(pos_next, e+sp, m->m_len);
|
|
sp += m->m_len, dl -= m->m_len;
|
|
m = m->m_next;
|
|
if (m == NULL)
|
|
goto done;
|
|
}
|
|
/*
|
|
* Do bookkeeping. m now points to the last mbuf
|
|
* we grabbed data from. We know we consumed a
|
|
* full block of data as otherwise we'd have hit
|
|
* the end of the mbuf chain, so deduct from data_len.
|
|
* Otherwise advance the block number (i) and setup
|
|
* pos+space to reflect contents of the new mbuf.
|
|
*/
|
|
data_len -= AES_BLOCK_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;
|
|
}
|
|
}
|
|
done:
|
|
/* 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 ieee80211vap *vap = ctx->cc_vap;
|
|
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_vap->iv_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
|
|
* since rx'd frames are never badly fragmented
|
|
* because drivers typically recv in clusters.
|
|
*/
|
|
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_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
|
|
"%s", "AES-CCM decrypt failed; MIC mismatch");
|
|
vap->iv_stats.is_rx_ccmpmic++;
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
#undef CCMP_DECRYPT
|
|
|
|
/*
|
|
* Module glue.
|
|
*/
|
|
IEEE80211_CRYPTO_MODULE(ccmp, 1);
|