mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-03 17:40:04 +00:00
![Solomon Tan](/assets/img/avatar_default.png)
This patch addresses the checkpatch.pl flag that there should not be a space after a cast. Signed-off-by: Solomon Tan <wjsota@gmail.com> Link: https://lore.kernel.org/r/20220419124318.8028-1-wjsota@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
421 lines
9.6 KiB
C
421 lines
9.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Host AP crypt: host-based CCMP encryption implementation for Host AP driver
|
|
*
|
|
* Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/random.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/if_ether.h>
|
|
#include <linux/if_arp.h>
|
|
#include <linux/string.h>
|
|
#include <linux/wireless.h>
|
|
#include "rtllib.h"
|
|
|
|
#include <linux/crypto.h>
|
|
#include <crypto/aead.h>
|
|
|
|
#include <linux/scatterlist.h>
|
|
|
|
#define AES_BLOCK_LEN 16
|
|
#define CCMP_HDR_LEN 8
|
|
#define CCMP_MIC_LEN 8
|
|
#define CCMP_TK_LEN 16
|
|
#define CCMP_PN_LEN 6
|
|
|
|
struct rtllib_ccmp_data {
|
|
u8 key[CCMP_TK_LEN];
|
|
int key_set;
|
|
|
|
u8 tx_pn[CCMP_PN_LEN];
|
|
u8 rx_pn[CCMP_PN_LEN];
|
|
|
|
u32 dot11RSNAStatsCCMPFormatErrors;
|
|
u32 dot11RSNAStatsCCMPReplays;
|
|
u32 dot11RSNAStatsCCMPDecryptErrors;
|
|
|
|
int key_idx;
|
|
|
|
struct crypto_aead *tfm;
|
|
|
|
/* scratch buffers for virt_to_page() (crypto API) */
|
|
u8 tx_aad[2 * AES_BLOCK_LEN];
|
|
u8 rx_aad[2 * AES_BLOCK_LEN];
|
|
};
|
|
|
|
static void *rtllib_ccmp_init(int key_idx)
|
|
{
|
|
struct rtllib_ccmp_data *priv;
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_ATOMIC);
|
|
if (priv == NULL)
|
|
goto fail;
|
|
priv->key_idx = key_idx;
|
|
|
|
priv->tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC);
|
|
if (IS_ERR(priv->tfm)) {
|
|
pr_debug("Could not allocate crypto API aes\n");
|
|
priv->tfm = NULL;
|
|
goto fail;
|
|
}
|
|
return priv;
|
|
|
|
fail:
|
|
if (priv) {
|
|
if (priv->tfm)
|
|
crypto_free_aead(priv->tfm);
|
|
kfree(priv);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static void rtllib_ccmp_deinit(void *priv)
|
|
{
|
|
struct rtllib_ccmp_data *_priv = priv;
|
|
|
|
if (_priv && _priv->tfm)
|
|
crypto_free_aead(_priv->tfm);
|
|
kfree(priv);
|
|
}
|
|
|
|
|
|
static int ccmp_init_iv_and_aad(struct rtllib_hdr_4addr *hdr,
|
|
u8 *pn, u8 *iv, u8 *aad)
|
|
{
|
|
u8 *pos, qc = 0;
|
|
size_t aad_len;
|
|
u16 fc;
|
|
int a4_included, qc_included;
|
|
|
|
fc = le16_to_cpu(hdr->frame_ctl);
|
|
a4_included = ((fc & (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS)) ==
|
|
(RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS));
|
|
|
|
qc_included = ((WLAN_FC_GET_TYPE(fc) == RTLLIB_FTYPE_DATA) &&
|
|
(WLAN_FC_GET_STYPE(fc) & 0x80));
|
|
aad_len = 22;
|
|
if (a4_included)
|
|
aad_len += 6;
|
|
if (qc_included) {
|
|
pos = (u8 *)&hdr->addr4;
|
|
if (a4_included)
|
|
pos += 6;
|
|
qc = *pos & 0x0f;
|
|
aad_len += 2;
|
|
}
|
|
/* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
|
|
* mode authentication are not allowed to collide, yet both are derived
|
|
* from the same vector. We only set L := 1 here to indicate that the
|
|
* data size can be represented in (L+1) bytes. The CCM layer will take
|
|
* care of storing the data length in the top (L+1) bytes and setting
|
|
* and clearing the other bits as is required to derive the two IVs.
|
|
*/
|
|
iv[0] = 0x1;
|
|
|
|
/* Nonce: QC | A2 | PN */
|
|
iv[1] = qc;
|
|
memcpy(iv + 2, hdr->addr2, ETH_ALEN);
|
|
memcpy(iv + 8, pn, CCMP_PN_LEN);
|
|
|
|
/* 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)
|
|
*/
|
|
pos = (u8 *)hdr;
|
|
aad[0] = pos[0] & 0x8f;
|
|
aad[1] = pos[1] & 0xc7;
|
|
memcpy(&aad[2], &hdr->addr1, ETH_ALEN);
|
|
memcpy(&aad[8], &hdr->addr2, ETH_ALEN);
|
|
memcpy(&aad[14], &hdr->addr3, ETH_ALEN);
|
|
pos = (u8 *)&hdr->seq_ctl;
|
|
aad[20] = pos[0] & 0x0f;
|
|
aad[21] = 0; /* all bits masked */
|
|
memset(aad + 22, 0, 8);
|
|
if (a4_included)
|
|
memcpy(aad + 22, hdr->addr4, ETH_ALEN);
|
|
if (qc_included) {
|
|
aad[a4_included ? 28 : 22] = qc;
|
|
/* rest of QC masked */
|
|
}
|
|
|
|
return aad_len;
|
|
}
|
|
|
|
|
|
|
|
static int rtllib_ccmp_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
|
|
{
|
|
struct rtllib_ccmp_data *key = priv;
|
|
int i;
|
|
u8 *pos;
|
|
struct rtllib_hdr_4addr *hdr;
|
|
struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb +
|
|
MAX_DEV_ADDR_SIZE);
|
|
if (skb_headroom(skb) < CCMP_HDR_LEN ||
|
|
skb_tailroom(skb) < CCMP_MIC_LEN ||
|
|
skb->len < hdr_len)
|
|
return -1;
|
|
|
|
pos = skb_push(skb, CCMP_HDR_LEN);
|
|
memmove(pos, pos + CCMP_HDR_LEN, hdr_len);
|
|
pos += hdr_len;
|
|
|
|
i = CCMP_PN_LEN - 1;
|
|
while (i >= 0) {
|
|
key->tx_pn[i]++;
|
|
if (key->tx_pn[i] != 0)
|
|
break;
|
|
i--;
|
|
}
|
|
|
|
*pos++ = key->tx_pn[5];
|
|
*pos++ = key->tx_pn[4];
|
|
*pos++ = 0;
|
|
*pos++ = (key->key_idx << 6) | (1 << 5) /* Ext IV included */;
|
|
*pos++ = key->tx_pn[3];
|
|
*pos++ = key->tx_pn[2];
|
|
*pos++ = key->tx_pn[1];
|
|
*pos++ = key->tx_pn[0];
|
|
|
|
hdr = (struct rtllib_hdr_4addr *)skb->data;
|
|
if (!tcb_desc->bHwSec) {
|
|
struct aead_request *req;
|
|
struct scatterlist sg[2];
|
|
u8 *aad = key->tx_aad;
|
|
u8 iv[AES_BLOCK_LEN];
|
|
int aad_len, ret;
|
|
int data_len = skb->len - hdr_len - CCMP_HDR_LEN;
|
|
|
|
req = aead_request_alloc(key->tfm, GFP_ATOMIC);
|
|
if (!req)
|
|
return -ENOMEM;
|
|
|
|
aad_len = ccmp_init_iv_and_aad(hdr, key->tx_pn, iv, aad);
|
|
|
|
skb_put(skb, CCMP_MIC_LEN);
|
|
sg_init_table(sg, 2);
|
|
sg_set_buf(&sg[0], aad, aad_len);
|
|
sg_set_buf(&sg[1], skb->data + hdr_len + CCMP_HDR_LEN,
|
|
data_len + CCMP_MIC_LEN);
|
|
|
|
aead_request_set_callback(req, 0, NULL, NULL);
|
|
aead_request_set_ad(req, aad_len);
|
|
aead_request_set_crypt(req, sg, sg, data_len, iv);
|
|
|
|
ret = crypto_aead_encrypt(req);
|
|
aead_request_free(req);
|
|
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int rtllib_ccmp_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
|
|
{
|
|
struct rtllib_ccmp_data *key = priv;
|
|
u8 keyidx, *pos;
|
|
struct rtllib_hdr_4addr *hdr;
|
|
struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb +
|
|
MAX_DEV_ADDR_SIZE);
|
|
u8 pn[6];
|
|
|
|
if (skb->len < hdr_len + CCMP_HDR_LEN + CCMP_MIC_LEN) {
|
|
key->dot11RSNAStatsCCMPFormatErrors++;
|
|
return -1;
|
|
}
|
|
|
|
hdr = (struct rtllib_hdr_4addr *)skb->data;
|
|
pos = skb->data + hdr_len;
|
|
keyidx = pos[3];
|
|
if (!(keyidx & (1 << 5))) {
|
|
if (net_ratelimit()) {
|
|
pr_debug("CCMP: received packet without ExtIV flag from %pM\n",
|
|
hdr->addr2);
|
|
}
|
|
key->dot11RSNAStatsCCMPFormatErrors++;
|
|
return -2;
|
|
}
|
|
keyidx >>= 6;
|
|
if (key->key_idx != keyidx) {
|
|
pr_debug("CCMP: RX tkey->key_idx=%d frame keyidx=%d priv=%p\n",
|
|
key->key_idx, keyidx, priv);
|
|
return -6;
|
|
}
|
|
if (!key->key_set) {
|
|
if (net_ratelimit()) {
|
|
pr_debug("CCMP: received packet from %pM with keyid=%d that does not have a configured key\n",
|
|
hdr->addr2, keyidx);
|
|
}
|
|
return -3;
|
|
}
|
|
|
|
pn[0] = pos[7];
|
|
pn[1] = pos[6];
|
|
pn[2] = pos[5];
|
|
pn[3] = pos[4];
|
|
pn[4] = pos[1];
|
|
pn[5] = pos[0];
|
|
pos += 8;
|
|
if (memcmp(pn, key->rx_pn, CCMP_PN_LEN) <= 0) {
|
|
key->dot11RSNAStatsCCMPReplays++;
|
|
return -4;
|
|
}
|
|
if (!tcb_desc->bHwSec) {
|
|
size_t data_len = skb->len - hdr_len - CCMP_HDR_LEN;
|
|
struct aead_request *req;
|
|
struct scatterlist sg[2];
|
|
u8 *aad = key->rx_aad;
|
|
u8 iv[AES_BLOCK_LEN];
|
|
int aad_len, ret;
|
|
|
|
req = aead_request_alloc(key->tfm, GFP_ATOMIC);
|
|
if (!req)
|
|
return -ENOMEM;
|
|
|
|
aad_len = ccmp_init_iv_and_aad(hdr, pn, iv, aad);
|
|
|
|
sg_init_table(sg, 2);
|
|
sg_set_buf(&sg[0], aad, aad_len);
|
|
sg_set_buf(&sg[1], pos, data_len);
|
|
|
|
aead_request_set_callback(req, 0, NULL, NULL);
|
|
aead_request_set_ad(req, aad_len);
|
|
aead_request_set_crypt(req, sg, sg, data_len, iv);
|
|
|
|
ret = crypto_aead_decrypt(req);
|
|
aead_request_free(req);
|
|
|
|
if (ret) {
|
|
if (net_ratelimit()) {
|
|
pr_debug("CCMP: decrypt failed: STA= %pM\n",
|
|
hdr->addr2);
|
|
}
|
|
key->dot11RSNAStatsCCMPDecryptErrors++;
|
|
return -5;
|
|
}
|
|
|
|
memcpy(key->rx_pn, pn, CCMP_PN_LEN);
|
|
}
|
|
/* Remove hdr and MIC */
|
|
memmove(skb->data + CCMP_HDR_LEN, skb->data, hdr_len);
|
|
skb_pull(skb, CCMP_HDR_LEN);
|
|
skb_trim(skb, skb->len - CCMP_MIC_LEN);
|
|
|
|
return keyidx;
|
|
}
|
|
|
|
|
|
static int rtllib_ccmp_set_key(void *key, int len, u8 *seq, void *priv)
|
|
{
|
|
struct rtllib_ccmp_data *data = priv;
|
|
int keyidx;
|
|
struct crypto_aead *tfm = data->tfm;
|
|
|
|
keyidx = data->key_idx;
|
|
memset(data, 0, sizeof(*data));
|
|
data->key_idx = keyidx;
|
|
data->tfm = tfm;
|
|
if (len == CCMP_TK_LEN) {
|
|
memcpy(data->key, key, CCMP_TK_LEN);
|
|
data->key_set = 1;
|
|
if (seq) {
|
|
data->rx_pn[0] = seq[5];
|
|
data->rx_pn[1] = seq[4];
|
|
data->rx_pn[2] = seq[3];
|
|
data->rx_pn[3] = seq[2];
|
|
data->rx_pn[4] = seq[1];
|
|
data->rx_pn[5] = seq[0];
|
|
}
|
|
if (crypto_aead_setauthsize(data->tfm, CCMP_MIC_LEN) ||
|
|
crypto_aead_setkey(data->tfm, data->key, CCMP_TK_LEN))
|
|
return -1;
|
|
} else if (len == 0) {
|
|
data->key_set = 0;
|
|
} else {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int rtllib_ccmp_get_key(void *key, int len, u8 *seq, void *priv)
|
|
{
|
|
struct rtllib_ccmp_data *data = priv;
|
|
|
|
if (len < CCMP_TK_LEN)
|
|
return -1;
|
|
|
|
if (!data->key_set)
|
|
return 0;
|
|
memcpy(key, data->key, CCMP_TK_LEN);
|
|
|
|
if (seq) {
|
|
seq[0] = data->tx_pn[5];
|
|
seq[1] = data->tx_pn[4];
|
|
seq[2] = data->tx_pn[3];
|
|
seq[3] = data->tx_pn[2];
|
|
seq[4] = data->tx_pn[1];
|
|
seq[5] = data->tx_pn[0];
|
|
}
|
|
|
|
return CCMP_TK_LEN;
|
|
}
|
|
|
|
|
|
static void rtllib_ccmp_print_stats(struct seq_file *m, void *priv)
|
|
{
|
|
struct rtllib_ccmp_data *ccmp = priv;
|
|
|
|
seq_printf(m,
|
|
"key[%d] alg=CCMP key_set=%d tx_pn=%pM rx_pn=%pM format_errors=%d replays=%d decrypt_errors=%d\n",
|
|
ccmp->key_idx, ccmp->key_set,
|
|
ccmp->tx_pn, ccmp->rx_pn,
|
|
ccmp->dot11RSNAStatsCCMPFormatErrors,
|
|
ccmp->dot11RSNAStatsCCMPReplays,
|
|
ccmp->dot11RSNAStatsCCMPDecryptErrors);
|
|
}
|
|
|
|
static struct lib80211_crypto_ops rtllib_crypt_ccmp = {
|
|
.name = "R-CCMP",
|
|
.init = rtllib_ccmp_init,
|
|
.deinit = rtllib_ccmp_deinit,
|
|
.encrypt_mpdu = rtllib_ccmp_encrypt,
|
|
.decrypt_mpdu = rtllib_ccmp_decrypt,
|
|
.encrypt_msdu = NULL,
|
|
.decrypt_msdu = NULL,
|
|
.set_key = rtllib_ccmp_set_key,
|
|
.get_key = rtllib_ccmp_get_key,
|
|
.print_stats = rtllib_ccmp_print_stats,
|
|
.extra_mpdu_prefix_len = CCMP_HDR_LEN,
|
|
.extra_mpdu_postfix_len = CCMP_MIC_LEN,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
|
|
static int __init rtllib_crypto_ccmp_init(void)
|
|
{
|
|
return lib80211_register_crypto_ops(&rtllib_crypt_ccmp);
|
|
}
|
|
|
|
|
|
static void __exit rtllib_crypto_ccmp_exit(void)
|
|
{
|
|
lib80211_unregister_crypto_ops(&rtllib_crypt_ccmp);
|
|
}
|
|
|
|
module_init(rtllib_crypto_ccmp_init);
|
|
module_exit(rtllib_crypto_ccmp_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|