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mac80111: Add GCMP and GCMP-256 ciphers 

This allows mac80211 to configure GCMP and GCMP-256 to the driver and
also use software-implementation within mac80211 when the driver does
not support this with hardware accelaration.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
[remove a spurious newline]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Jouni Malinen 2015-01-24 19:52:06 +02:00 committed by Johannes Berg
parent cfcf1682c4
commit 00b9cfa3ff
14 changed files with 492 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
include/net/mac80211.h
View File

@ -1294,8 +1294,8 @@ struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev);
* @IEEE80211_KEY_FLAG_PAIRWISE: Set by mac80211, this flag indicates
* that the key is pairwise rather then a shared key.
* @IEEE80211_KEY_FLAG_SW_MGMT_TX: This flag should be set by the driver for a
* CCMP key if it requires CCMP encryption of management frames (MFP) to
* be done in software.
* CCMP/GCMP key if it requires CCMP/GCMP encryption of management frames
* (MFP) to be done in software.
* @IEEE80211_KEY_FLAG_PUT_IV_SPACE: This flag should be set by the driver
* if space should be prepared for the IV, but the IV
* itself should not be generated. Do not set together with
@ -1310,7 +1310,7 @@ struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev);
* RX, if your crypto engine can't deal with TX you can also set the
* %IEEE80211_KEY_FLAG_SW_MGMT_TX flag to encrypt such frames in SW.
* @IEEE80211_KEY_FLAG_GENERATE_IV_MGMT: This flag should be set by the
* driver for a CCMP key to indicate that is requires IV generation
* driver for a CCMP/GCMP key to indicate that is requires IV generation
* only for managment frames (MFP).
* @IEEE80211_KEY_FLAG_RESERVE_TAILROOM: This flag should be set by the
* driver for a key to indicate that sufficient tailroom must always
@ -4098,6 +4098,8 @@ void ieee80211_aes_cmac_calculate_k1_k2(struct ieee80211_key_conf *keyconf,
* reverse order than in packet)
* @aes_cmac: PN data, most significant byte first (big endian,
* reverse order than in packet)
* @gcmp: PN data, most significant byte first (big endian,
* reverse order than in packet)
*/
struct ieee80211_key_seq {
union {
@ -4111,6 +4113,9 @@ struct ieee80211_key_seq {
struct {
u8 pn[6];
} aes_cmac;
struct {
u8 pn[6];
} gcmp;
};
};
@ -4135,7 +4140,7 @@ void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
* ieee80211_get_key_rx_seq - get key RX sequence counter
*
* @keyconf: the parameter passed with the set key
* @tid: The TID, or -1 for the management frame value (CCMP only);
* @tid: The TID, or -1 for the management frame value (CCMP/GCMP only);
* the value on TID 0 is also used for non-QoS frames. For
* CMAC, only TID 0 is valid.
* @seq: buffer to receive the sequence data
@ -4171,7 +4176,7 @@ void ieee80211_set_key_tx_seq(struct ieee80211_key_conf *keyconf,
* ieee80211_set_key_rx_seq - set key RX sequence counter
*
* @keyconf: the parameter passed with the set key
* @tid: The TID, or -1 for the management frame value (CCMP only);
* @tid: The TID, or -1 for the management frame value (CCMP/GCMP only);
* the value on TID 0 is also used for non-QoS frames. For
* CMAC, only TID 0 is valid.
* @seq: new sequence data

1
net/mac80211/Kconfig
View File

@ -5,6 +5,7 @@ config MAC80211
select CRYPTO_ARC4
select CRYPTO_AES
select CRYPTO_CCM
select CRYPTO_GCM
select CRC32
select AVERAGE
---help---

1
net/mac80211/Makefile
View File

@ -15,6 +15,7 @@ mac80211-y := \
michael.o \
tkip.o \
aes_ccm.o \
aes_gcm.o \
aes_cmac.o \
cfg.o \
ethtool.o \

95
net/mac80211/aes_gcm.c Normal file
View File

@ -0,0 +1,95 @@
/*
* Copyright 2014-2015, Qualcomm Atheros, Inc.
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <crypto/aes.h>
#include <net/mac80211.h>
#include "key.h"
#include "aes_gcm.h"
void ieee80211_aes_gcm_encrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad,
u8 *data, size_t data_len, u8 *mic)
{
struct scatterlist assoc, pt, ct[2];
char aead_req_data[sizeof(struct aead_request) +
crypto_aead_reqsize(tfm)]
__aligned(__alignof__(struct aead_request));
struct aead_request *aead_req = (void *)aead_req_data;
memset(aead_req, 0, sizeof(aead_req_data));
sg_init_one(&pt, data, data_len);
sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
sg_init_table(ct, 2);
sg_set_buf(&ct[0], data, data_len);
sg_set_buf(&ct[1], mic, IEEE80211_GCMP_MIC_LEN);
aead_request_set_tfm(aead_req, tfm);
aead_request_set_assoc(aead_req, &assoc, assoc.length);
aead_request_set_crypt(aead_req, &pt, ct, data_len, j_0);
crypto_aead_encrypt(aead_req);
}
int ieee80211_aes_gcm_decrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad,
u8 *data, size_t data_len, u8 *mic)
{
struct scatterlist assoc, pt, ct[2];
char aead_req_data[sizeof(struct aead_request) +
crypto_aead_reqsize(tfm)]
__aligned(__alignof__(struct aead_request));
struct aead_request *aead_req = (void *)aead_req_data;
if (data_len == 0)
return -EINVAL;
memset(aead_req, 0, sizeof(aead_req_data));
sg_init_one(&pt, data, data_len);
sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
sg_init_table(ct, 2);
sg_set_buf(&ct[0], data, data_len);
sg_set_buf(&ct[1], mic, IEEE80211_GCMP_MIC_LEN);
aead_request_set_tfm(aead_req, tfm);
aead_request_set_assoc(aead_req, &assoc, assoc.length);
aead_request_set_crypt(aead_req, ct, &pt,
data_len + IEEE80211_GCMP_MIC_LEN, j_0);
return crypto_aead_decrypt(aead_req);
}
struct crypto_aead *ieee80211_aes_gcm_key_setup_encrypt(const u8 key[],
size_t key_len)
{
struct crypto_aead *tfm;
int err;
tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm))
return tfm;
err = crypto_aead_setkey(tfm, key, key_len);
if (!err)
err = crypto_aead_setauthsize(tfm, IEEE80211_GCMP_MIC_LEN);
if (!err)
return tfm;
crypto_free_aead(tfm);
return ERR_PTR(err);
}
void ieee80211_aes_gcm_key_free(struct crypto_aead *tfm)
{
crypto_free_aead(tfm);
}

22
net/mac80211/aes_gcm.h Normal file
View File

@ -0,0 +1,22 @@
/*
* Copyright 2014-2015, Qualcomm Atheros, Inc.
*
* 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.
*/
#ifndef AES_GCM_H
#define AES_GCM_H
#include <linux/crypto.h>
void ieee80211_aes_gcm_encrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad,
u8 *data, size_t data_len, u8 *mic);
int ieee80211_aes_gcm_decrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad,
u8 *data, size_t data_len, u8 *mic);
struct crypto_aead *ieee80211_aes_gcm_key_setup_encrypt(const u8 key[],
size_t key_len);
void ieee80211_aes_gcm_key_free(struct crypto_aead *tfm);
#endif /* AES_GCM_H */

13
net/mac80211/cfg.c
View File

@ -164,6 +164,7 @@ static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev,
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
break;
default:
cs = ieee80211_cs_get(local, params->cipher, sdata->vif.type);
@ -369,6 +370,18 @@ static int ieee80211_get_key(struct wiphy *wiphy, struct net_device *dev,
params.seq = seq;
params.seq_len = 6;
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
pn64 = atomic64_read(&key->u.gcmp.tx_pn);
seq[0] = pn64;
seq[1] = pn64 >> 8;
seq[2] = pn64 >> 16;
seq[3] = pn64 >> 24;
seq[4] = pn64 >> 32;
seq[5] = pn64 >> 40;
params.seq = seq;
params.seq_len = 6;
break;
}
params.key = key->conf.key;

22
net/mac80211/debugfs_key.c
View File

@ -105,6 +105,13 @@ static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
(u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
(u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
pn = atomic64_read(&key->u.gcmp.tx_pn);
len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
(u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
(u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
break;
default:
return 0;
}
@ -151,6 +158,17 @@ static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
rpn[3], rpn[4], rpn[5]);
len = p - buf;
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
rpn = key->u.gcmp.rx_pn[i];
p += scnprintf(p, sizeof(buf)+buf-p,
"%02x%02x%02x%02x%02x%02x\n",
rpn[0], rpn[1], rpn[2],
rpn[3], rpn[4], rpn[5]);
}
len = p - buf;
break;
default:
return 0;
}
@ -173,6 +191,10 @@ static ssize_t key_replays_read(struct file *file, char __user *userbuf,
len = scnprintf(buf, sizeof(buf), "%u\n",
key->u.aes_cmac.replays);
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
len = scnprintf(buf, sizeof(buf), "%u\n", key->u.gcmp.replays);
break;
default:
return 0;
}

74
net/mac80211/key.c
View File

@ -24,6 +24,7 @@
#include "debugfs_key.h"
#include "aes_ccm.h"
#include "aes_cmac.h"
#include "aes_gcm.h"
/**
@ -163,6 +164,8 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
case WLAN_CIPHER_SUITE_TKIP:
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
/* all of these we can do in software - if driver can */
if (ret == 1)
return 0;
@ -412,6 +415,25 @@ ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
return ERR_PTR(err);
}
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
key->u.gcmp.rx_pn[i][j] =
seq[IEEE80211_GCMP_PN_LEN - j - 1];
/* Initialize AES key state here as an optimization so that
* it does not need to be initialized for every packet.
*/
key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
key_len);
if (IS_ERR(key->u.gcmp.tfm)) {
err = PTR_ERR(key->u.gcmp.tfm);
kfree(key);
return ERR_PTR(err);
}
break;
default:
if (cs) {
size_t len = (seq_len > MAX_PN_LEN) ?
@ -433,10 +455,18 @@ ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
static void ieee80211_key_free_common(struct ieee80211_key *key)
{
if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP)
switch (key->conf.cipher) {
case WLAN_CIPHER_SUITE_CCMP:
ieee80211_aes_key_free(key->u.ccmp.tfm);
if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
break;
case WLAN_CIPHER_SUITE_AES_CMAC:
ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
break;
}
kzfree(key);
}
@ -760,6 +790,16 @@ void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
seq->ccmp.pn[1] = pn64 >> 32;
seq->ccmp.pn[0] = pn64 >> 40;
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
pn64 = atomic64_read(&key->u.gcmp.tx_pn);
seq->gcmp.pn[5] = pn64;
seq->gcmp.pn[4] = pn64 >> 8;
seq->gcmp.pn[3] = pn64 >> 16;
seq->gcmp.pn[2] = pn64 >> 24;
seq->gcmp.pn[1] = pn64 >> 32;
seq->gcmp.pn[0] = pn64 >> 40;
break;
default:
WARN_ON(1);
}
@ -796,6 +836,16 @@ void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
pn = key->u.aes_cmac.rx_pn;
memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
return;
if (tid < 0)
pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
else
pn = key->u.gcmp.rx_pn[tid];
memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
break;
}
}
EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
@ -831,6 +881,16 @@ void ieee80211_set_key_tx_seq(struct ieee80211_key_conf *keyconf,
((u64)seq->aes_cmac.pn[0] << 40);
atomic64_set(&key->u.aes_cmac.tx_pn, pn64);
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
pn64 = (u64)seq->gcmp.pn[5] |
((u64)seq->gcmp.pn[4] << 8) |
((u64)seq->gcmp.pn[3] << 16) |
((u64)seq->gcmp.pn[2] << 24) |
((u64)seq->gcmp.pn[1] << 32) |
((u64)seq->gcmp.pn[0] << 40);
atomic64_set(&key->u.gcmp.tx_pn, pn64);
break;
default:
WARN_ON(1);
break;
@ -868,6 +928,16 @@ void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
pn = key->u.aes_cmac.rx_pn;
memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
return;
if (tid < 0)
pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
else
pn = key->u.gcmp.rx_pn[tid];
memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
break;
default:
WARN_ON(1);
break;

11
net/mac80211/key.h
View File

@ -94,6 +94,17 @@ struct ieee80211_key {
u32 replays; /* dot11RSNAStatsCMACReplays */
u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
} aes_cmac;
struct {
atomic64_t tx_pn;
/* Last received packet number. The first
* IEEE80211_NUM_TIDS counters are used with Data
* frames and the last counter is used with Robust
* Management frames.
*/
u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_GCMP_PN_LEN];
struct crypto_aead *tfm;
u32 replays; /* dot11RSNAStatsGCMPReplays */
} gcmp;
struct {
/* generic cipher scheme */
u8 rx_pn[IEEE80211_NUM_TIDS + 1][MAX_PN_LEN];

9
net/mac80211/main.c
View File

@ -666,6 +666,8 @@ static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
WLAN_CIPHER_SUITE_WEP104,
WLAN_CIPHER_SUITE_TKIP,
WLAN_CIPHER_SUITE_CCMP,
WLAN_CIPHER_SUITE_GCMP,
WLAN_CIPHER_SUITE_GCMP_256,
/* keep last -- depends on hw flags! */
WLAN_CIPHER_SUITE_AES_CMAC
@ -724,9 +726,10 @@ static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
/* Driver specifies cipher schemes only (but not cipher suites
* including the schemes)
*
* We start counting ciphers defined by schemes, TKIP and CCMP
* We start counting ciphers defined by schemes, TKIP, CCMP,
* GCMP, and GCMP-256
*/
n_suites = local->hw.n_cipher_schemes + 2;
n_suites = local->hw.n_cipher_schemes + 4;
/* check if we have WEP40 and WEP104 */
if (have_wep)
@ -742,6 +745,8 @@ static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
suites[w++] = WLAN_CIPHER_SUITE_CCMP;
suites[w++] = WLAN_CIPHER_SUITE_TKIP;
suites[w++] = WLAN_CIPHER_SUITE_GCMP;
suites[w++] = WLAN_CIPHER_SUITE_GCMP_256;
if (have_wep) {
suites[w++] = WLAN_CIPHER_SUITE_WEP40;

4
net/mac80211/rx.c
View File

@ -1655,6 +1655,10 @@ ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
case WLAN_CIPHER_SUITE_AES_CMAC:
result = ieee80211_crypto_aes_cmac_decrypt(rx);
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
result = ieee80211_crypto_gcmp_decrypt(rx);
break;
default:
result = ieee80211_crypto_hw_decrypt(rx);
}

5
net/mac80211/tx.c
View File

@ -626,6 +626,8 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
tx->key = NULL;
break;
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
if (!ieee80211_is_data_present(hdr->frame_control) &&
!ieee80211_use_mfp(hdr->frame_control, tx->sta,
tx->skb))
@ -1014,6 +1016,9 @@ ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
return ieee80211_crypto_ccmp_encrypt(tx);
case WLAN_CIPHER_SUITE_AES_CMAC:
return ieee80211_crypto_aes_cmac_encrypt(tx);
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
return ieee80211_crypto_gcmp_encrypt(tx);
default:
return ieee80211_crypto_hw_encrypt(tx);
}

224
net/mac80211/wpa.c
View File

@ -22,6 +22,7 @@
#include "tkip.h"
#include "aes_ccm.h"
#include "aes_cmac.h"
#include "aes_gcm.h"
#include "wpa.h"
ieee80211_tx_result
@ -546,6 +547,229 @@ ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
return RX_CONTINUE;
}
static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad)
{
__le16 mask_fc;
u8 qos_tid;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
memcpy(j_0, hdr->addr2, ETH_ALEN);
memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
j_0[13] = 0;
j_0[14] = 0;
j_0[AES_BLOCK_SIZE - 1] = 0x01;
/* AAD (extra authenticate-only data) / masked 802.11 header
* FC | A1 | A2 | A3 | SC | [A4] | [QC]
*/
put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]);
/* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
* Retry, PwrMgt, MoreData; set Protected
*/
mask_fc = hdr->frame_control;
mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
if (!ieee80211_is_mgmt(hdr->frame_control))
mask_fc &= ~cpu_to_le16(0x0070);
mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
put_unaligned(mask_fc, (__le16 *)&aad[2]);
memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
/* Mask Seq#, leave Frag# */
aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f;
aad[23] = 0;
if (ieee80211_is_data_qos(hdr->frame_control))
qos_tid = *ieee80211_get_qos_ctl(hdr) &
IEEE80211_QOS_CTL_TID_MASK;
else
qos_tid = 0;
if (ieee80211_has_a4(hdr->frame_control)) {
memcpy(&aad[24], hdr->addr4, ETH_ALEN);
aad[30] = qos_tid;
aad[31] = 0;
} else {
memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
aad[24] = qos_tid;
}
}
static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id)
{
hdr[0] = pn[5];
hdr[1] = pn[4];
hdr[2] = 0;
hdr[3] = 0x20 | (key_id << 6);
hdr[4] = pn[3];
hdr[5] = pn[2];
hdr[6] = pn[1];
hdr[7] = pn[0];
}
static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr)
{
pn[0] = hdr[7];
pn[1] = hdr[6];
pn[2] = hdr[5];
pn[3] = hdr[4];
pn[4] = hdr[1];
pn[5] = hdr[0];
}
static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct ieee80211_key *key = tx->key;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
int hdrlen, len, tail;
u8 *pos;
u8 pn[6];
u64 pn64;
u8 aad[2 * AES_BLOCK_SIZE];
u8 j_0[AES_BLOCK_SIZE];
if (info->control.hw_key &&
!(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
!(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
!((info->control.hw_key->flags &
IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
ieee80211_is_mgmt(hdr->frame_control))) {
/* hwaccel has no need for preallocated room for GCMP
* header or MIC fields
*/
return 0;
}
hdrlen = ieee80211_hdrlen(hdr->frame_control);
len = skb->len - hdrlen;
if (info->control.hw_key)
tail = 0;
else
tail = IEEE80211_GCMP_MIC_LEN;
if (WARN_ON(skb_tailroom(skb) < tail ||
skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN))
return -1;
pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN);
memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen);
skb_set_network_header(skb, skb_network_offset(skb) +
IEEE80211_GCMP_HDR_LEN);
/* the HW only needs room for the IV, but not the actual IV */
if (info->control.hw_key &&
(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
return 0;
hdr = (struct ieee80211_hdr *)pos;
pos += hdrlen;
pn64 = atomic64_inc_return(&key->u.gcmp.tx_pn);
pn[5] = pn64;
pn[4] = pn64 >> 8;
pn[3] = pn64 >> 16;
pn[2] = pn64 >> 24;
pn[1] = pn64 >> 32;
pn[0] = pn64 >> 40;
gcmp_pn2hdr(pos, pn, key->conf.keyidx);
/* hwaccel - with software GCMP header */
if (info->control.hw_key)
return 0;
pos += IEEE80211_GCMP_HDR_LEN;
gcmp_special_blocks(skb, pn, j_0, aad);
ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len,
skb_put(skb, IEEE80211_GCMP_MIC_LEN));
return 0;
}
ieee80211_tx_result
ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx)
{
struct sk_buff *skb;
ieee80211_tx_set_protected(tx);
skb_queue_walk(&tx->skbs, skb) {
if (gcmp_encrypt_skb(tx, skb) < 0)
return TX_DROP;
}
return TX_CONTINUE;
}
ieee80211_rx_result
ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
int hdrlen;
struct ieee80211_key *key = rx->key;
struct sk_buff *skb = rx->skb;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
u8 pn[IEEE80211_GCMP_PN_LEN];
int data_len;
int queue;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
if (!ieee80211_is_data(hdr->frame_control) &&
!ieee80211_is_robust_mgmt_frame(skb))
return RX_CONTINUE;
data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN -
IEEE80211_GCMP_MIC_LEN;
if (!rx->sta || data_len < 0)
return RX_DROP_UNUSABLE;
if (status->flag & RX_FLAG_DECRYPTED) {
if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN))
return RX_DROP_UNUSABLE;
} else {
if (skb_linearize(rx->skb))
return RX_DROP_UNUSABLE;
}
gcmp_hdr2pn(pn, skb->data + hdrlen);
queue = rx->security_idx;
if (memcmp(pn, key->u.gcmp.rx_pn[queue], IEEE80211_GCMP_PN_LEN) <= 0) {
key->u.gcmp.replays++;
return RX_DROP_UNUSABLE;
}
if (!(status->flag & RX_FLAG_DECRYPTED)) {
u8 aad[2 * AES_BLOCK_SIZE];
u8 j_0[AES_BLOCK_SIZE];
/* hardware didn't decrypt/verify MIC */
gcmp_special_blocks(skb, pn, j_0, aad);
if (ieee80211_aes_gcm_decrypt(
key->u.gcmp.tfm, j_0, aad,
skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN,
data_len,
skb->data + skb->len - IEEE80211_GCMP_MIC_LEN))
return RX_DROP_UNUSABLE;
}
memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN);
/* Remove GCMP header and MIC */
if (pskb_trim(skb, skb->len - IEEE80211_GCMP_MIC_LEN))
return RX_DROP_UNUSABLE;
memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen);
skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
return RX_CONTINUE;
}
static ieee80211_tx_result
ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx,
struct sk_buff *skb)

5
net/mac80211/wpa.h
View File

@ -37,4 +37,9 @@ ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx);
ieee80211_rx_result
ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx);
ieee80211_tx_result
ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx);
ieee80211_rx_result
ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx);
#endif /* WPA_H */