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rt2x00: Implement HW encryption (rt2500usb) 

rt2500usb supports hardware encryption.
rt2500usb supports up to 4 shared and pairwise keys.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ivo van Doorn 2008-12-02 18:20:42 +01:00 committed by John W. Linville
parent 0b927a0791
commit dddfb478b2
8 changed files with 156 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/wireless/rt2x00/Kconfig
View File

@ -57,6 +57,7 @@ config RT2500USB
tristate "Ralink rt2500 (USB) support"
depends on USB
select RT2X00_LIB_USB
select RT2X00_LIB_CRYPTO
---help---
This adds support for rt2500 wireless chipset family.
Supported chips: RT2571 & RT2572.

132
drivers/net/wireless/rt2x00/rt2500usb.c
View File

@ -35,6 +35,13 @@
#include "rt2x00usb.h"
#include "rt2500usb.h"
/*
* Allow hardware encryption to be disabled.
*/
static int modparam_nohwcrypt = 1;
module_param_named(nohwcrypt, modparam_nohwcrypt, bool, S_IRUGO);
MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
/*
* Register access.
* All access to the CSR registers will go through the methods
@ -323,6 +330,82 @@ static void rt2500usb_init_led(struct rt2x00_dev *rt2x00dev,
/*
* Configuration handlers.
*/
/*
* rt2500usb does not differentiate between shared and pairwise
* keys, so we should use the same function for both key types.
*/
static int rt2500usb_config_key(struct rt2x00_dev *rt2x00dev,
struct rt2x00lib_crypto *crypto,
struct ieee80211_key_conf *key)
{
int timeout;
u32 mask;
u16 reg;
if (crypto->cmd == SET_KEY) {
/*
* Pairwise key will always be entry 0, but this
* could collide with a shared key on the same
* position...
*/
mask = TXRX_CSR0_KEY_ID.bit_mask;
rt2500usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
reg &= mask;
if (reg && reg == mask)
return -ENOSPC;
reg = rt2x00_get_field16(reg, TXRX_CSR0_KEY_ID);
key->hw_key_idx += reg ? ffz(reg) : 0;
/*
* The encryption key doesn't fit within the CSR cache,
* this means we should allocate it seperately and use
* rt2x00usb_vendor_request() to send the key to the hardware.
*/
reg = KEY_ENTRY(key->hw_key_idx);
timeout = REGISTER_TIMEOUT32(sizeof(crypto->key));
rt2x00usb_vendor_request_large_buff(rt2x00dev, USB_MULTI_WRITE,
USB_VENDOR_REQUEST_OUT, reg,
crypto->key,
sizeof(crypto->key),
timeout);
/*
* The driver does not support the IV/EIV generation
* in hardware. However it doesn't support the IV/EIV
* inside the ieee80211 frame either, but requires it
* to be provided seperately for the descriptor.
* rt2x00lib will cut the IV/EIV data out of all frames
* given to us by mac80211, but we must tell mac80211
* to generate the IV/EIV data.
*/
key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
}
/*
* TXRX_CSR0_KEY_ID contains only single-bit fields to indicate
* a particular key is valid.
*/
rt2500usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
rt2x00_set_field16(&reg, TXRX_CSR0_ALGORITHM, crypto->cipher);
rt2x00_set_field16(&reg, TXRX_CSR0_IV_OFFSET, IEEE80211_HEADER);
mask = rt2x00_get_field16(reg, TXRX_CSR0_KEY_ID);
if (crypto->cmd == SET_KEY)
mask |= 1 << key->hw_key_idx;
else if (crypto->cmd == DISABLE_KEY)
mask &= ~(1 << key->hw_key_idx);
rt2x00_set_field16(&reg, TXRX_CSR0_KEY_ID, mask);
rt2500usb_register_write(rt2x00dev, TXRX_CSR0, reg);
return 0;
}
static void rt2500usb_config_filter(struct rt2x00_dev *rt2x00dev,
const unsigned int filter_flags)
{
@ -844,7 +927,7 @@ static int rt2500usb_init_registers(struct rt2x00_dev *rt2x00dev)
rt2500usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
rt2x00_set_field16(&reg, TXRX_CSR0_IV_OFFSET, IEEE80211_HEADER);
rt2x00_set_field16(&reg, TXRX_CSR0_KEY_ID, 0xff);
rt2x00_set_field16(&reg, TXRX_CSR0_KEY_ID, 0);
rt2500usb_register_write(rt2x00dev, TXRX_CSR0, reg);
rt2500usb_register_read(rt2x00dev, MAC_CSR18, &reg);
@ -1066,7 +1149,7 @@ static void rt2500usb_write_tx_desc(struct rt2x00_dev *rt2x00dev,
* Start writing the descriptor words.
*/
rt2x00_desc_read(txd, 1, &word);
rt2x00_set_field32(&word, TXD_W1_IV_OFFSET, IEEE80211_HEADER);
rt2x00_set_field32(&word, TXD_W1_IV_OFFSET, txdesc->iv_offset);
rt2x00_set_field32(&word, TXD_W1_AIFS, txdesc->aifs);
rt2x00_set_field32(&word, TXD_W1_CWMIN, txdesc->cw_min);
rt2x00_set_field32(&word, TXD_W1_CWMAX, txdesc->cw_max);
@ -1079,6 +1162,11 @@ static void rt2500usb_write_tx_desc(struct rt2x00_dev *rt2x00dev,
rt2x00_set_field32(&word, TXD_W2_PLCP_LENGTH_HIGH, txdesc->length_high);
rt2x00_desc_write(txd, 2, word);
if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc->flags)) {
_rt2x00_desc_write(txd, 3, skbdesc->iv[0]);
_rt2x00_desc_write(txd, 4, skbdesc->iv[1]);
}
rt2x00_desc_read(txd, 0, &word);
rt2x00_set_field32(&word, TXD_W0_RETRY_LIMIT, txdesc->retry_limit);
rt2x00_set_field32(&word, TXD_W0_MORE_FRAG,
@ -1093,7 +1181,8 @@ static void rt2500usb_write_tx_desc(struct rt2x00_dev *rt2x00dev,
test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags));
rt2x00_set_field32(&word, TXD_W0_IFS, txdesc->ifs);
rt2x00_set_field32(&word, TXD_W0_DATABYTE_COUNT, skb->len);
rt2x00_set_field32(&word, TXD_W0_CIPHER, CIPHER_NONE);
rt2x00_set_field32(&word, TXD_W0_CIPHER, txdesc->cipher);
rt2x00_set_field32(&word, TXD_W0_KEY_ID, txdesc->key_idx);
rt2x00_desc_write(txd, 0, word);
}
@ -1204,6 +1293,7 @@ static void rt2500usb_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
static void rt2500usb_fill_rxdone(struct queue_entry *entry,
struct rxdone_entry_desc *rxdesc)
{
struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
struct queue_entry_priv_usb *entry_priv = entry->priv_data;
struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
__le32 *rxd =
@ -1231,6 +1321,31 @@ static void rt2500usb_fill_rxdone(struct queue_entry *entry,
if (rt2x00_get_field32(word0, RXD_W0_PHYSICAL_ERROR))
rxdesc->flags |= RX_FLAG_FAILED_PLCP_CRC;
if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags)) {
rxdesc->cipher = rt2x00_get_field32(word0, RXD_W0_CIPHER);
if (rt2x00_get_field32(word0, RXD_W0_CIPHER_ERROR))
rxdesc->cipher_status = RX_CRYPTO_FAIL_KEY;
}
if (rxdesc->cipher != CIPHER_NONE) {
_rt2x00_desc_read(rxd, 2, &rxdesc->iv[0]);
_rt2x00_desc_read(rxd, 3, &rxdesc->iv[1]);
/* ICV is located at the end of frame */
/*
* Hardware has stripped IV/EIV data from 802.11 frame during
* decryption. It has provided the data seperately but rt2x00lib
* should decide if it should be reinserted.
*/
rxdesc->flags |= RX_FLAG_IV_STRIPPED;
if (rxdesc->cipher != CIPHER_TKIP)
rxdesc->flags |= RX_FLAG_MMIC_STRIPPED;
if (rxdesc->cipher_status == RX_CRYPTO_SUCCESS)
rxdesc->flags |= RX_FLAG_DECRYPTED;
else if (rxdesc->cipher_status == RX_CRYPTO_FAIL_MIC)
rxdesc->flags |= RX_FLAG_MMIC_ERROR;
}
/*
* Obtain the status about this packet.
* When frame was received with an OFDM bitrate,
@ -1238,8 +1353,8 @@ static void rt2500usb_fill_rxdone(struct queue_entry *entry,
* a CCK bitrate the signal is the rate in 100kbit/s.
*/
rxdesc->signal = rt2x00_get_field32(word1, RXD_W1_SIGNAL);
rxdesc->rssi = rt2x00_get_field32(word1, RXD_W1_RSSI) -
entry->queue->rt2x00dev->rssi_offset;
rxdesc->rssi =
rt2x00_get_field32(word1, RXD_W1_RSSI) - rt2x00dev->rssi_offset;
rxdesc->size = rt2x00_get_field32(word0, RXD_W0_DATABYTE_COUNT);
if (rt2x00_get_field32(word0, RXD_W0_OFDM))
@ -1727,6 +1842,10 @@ static int rt2500usb_probe_hw(struct rt2x00_dev *rt2x00dev)
__set_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
__set_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
__set_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags);
if (!modparam_nohwcrypt) {
__set_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags);
__set_bit(CONFIG_CRYPTO_COPY_IV, &rt2x00dev->flags);
}
__set_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags);
/*
@ -1746,6 +1865,7 @@ static const struct ieee80211_ops rt2500usb_mac80211_ops = {
.config = rt2x00mac_config,
.config_interface = rt2x00mac_config_interface,
.configure_filter = rt2x00mac_configure_filter,
.set_key = rt2x00mac_set_key,
.get_stats = rt2x00mac_get_stats,
.bss_info_changed = rt2x00mac_bss_info_changed,
.conf_tx = rt2x00mac_conf_tx,
@ -1767,6 +1887,8 @@ static const struct rt2x00lib_ops rt2500usb_rt2x00_ops = {
.get_tx_data_len = rt2500usb_get_tx_data_len,
.kick_tx_queue = rt2500usb_kick_tx_queue,
.fill_rxdone = rt2500usb_fill_rxdone,
.config_shared_key = rt2500usb_config_key,
.config_pairwise_key = rt2500usb_config_key,
.config_filter = rt2500usb_config_filter,
.config_intf = rt2500usb_config_intf,
.config_erp = rt2500usb_config_erp,

3
drivers/net/wireless/rt2x00/rt2500usb.h
View File

@ -447,6 +447,9 @@
#define SEC_CSR30 0x04bc
#define SEC_CSR31 0x04be
#define KEY_ENTRY(__idx) \
( SEC_CSR0 + ((__idx) * 16) )
/*
* PHY control registers.
*/

1
drivers/net/wireless/rt2x00/rt2x00.h
View File

@ -653,6 +653,7 @@ enum rt2x00_flags {
CONFIG_EXTERNAL_LNA_BG,
CONFIG_DOUBLE_ANTENNA,
CONFIG_DISABLE_LINK_TUNING,
CONFIG_CRYPTO_COPY_IV,
};
/*

12
drivers/net/wireless/rt2x00/rt2x00crypto.c
View File

@ -69,6 +69,18 @@ unsigned int rt2x00crypto_tx_overhead(struct ieee80211_tx_info *tx_info)
return overhead;
}
void rt2x00crypto_tx_copy_iv(struct sk_buff *skb, unsigned int iv_len)
{
struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
unsigned int header_length = ieee80211_get_hdrlen_from_skb(skb);
if (unlikely(!iv_len))
return;
/* Copy IV/EIV data */
memcpy(skbdesc->iv, skb->data + header_length, iv_len);
}
void rt2x00crypto_tx_remove_iv(struct sk_buff *skb, unsigned int iv_len)
{
struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);

6
drivers/net/wireless/rt2x00/rt2x00lib.h
View File

@ -219,6 +219,7 @@ static inline void rt2x00debug_update_crypto(struct rt2x00_dev *rt2x00dev,
#ifdef CONFIG_RT2X00_LIB_CRYPTO
enum cipher rt2x00crypto_key_to_cipher(struct ieee80211_key_conf *key);
unsigned int rt2x00crypto_tx_overhead(struct ieee80211_tx_info *tx_info);
void rt2x00crypto_tx_copy_iv(struct sk_buff *skb, unsigned int iv_len);
void rt2x00crypto_tx_remove_iv(struct sk_buff *skb, unsigned int iv_len);
void rt2x00crypto_tx_insert_iv(struct sk_buff *skb);
void rt2x00crypto_rx_insert_iv(struct sk_buff *skb, unsigned int align,
@ -235,6 +236,11 @@ static inline unsigned int rt2x00crypto_tx_overhead(struct ieee80211_tx_info *tx
return 0;
}
static inline void rt2x00crypto_tx_copy_iv(struct sk_buff *skb,
unsigned int iv_len)
{
}
static inline void rt2x00crypto_tx_remove_iv(struct sk_buff *skb,
unsigned int iv_len)
{

2
drivers/net/wireless/rt2x00/rt2x00mac.c
View File

@ -79,10 +79,8 @@ static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
* RTS/CTS frame should use the length of the frame plus any
* encryption overhead that will be added by the hardware.
*/
#ifdef CONFIG_RT2X00_LIB_CRYPTO
if (!frag_skb->do_not_encrypt)
data_length += rt2x00crypto_tx_overhead(tx_info);
#endif /* CONFIG_RT2X00_LIB_CRYPTO */
if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,

8
drivers/net/wireless/rt2x00/rt2x00queue.c
View File

@ -420,8 +420,12 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
* the frame so we can provide it to the driver seperately.
*/
if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
!test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags))
rt2x00crypto_tx_remove_iv(skb, iv_len);
!test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) {
if (test_bit(CONFIG_CRYPTO_COPY_IV, &queue->rt2x00dev->flags))
rt2x00crypto_tx_copy_iv(skb, iv_len);
else
rt2x00crypto_tx_remove_iv(skb, iv_len);
}
/*
* It could be possible that the queue was corrupted and this