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rt2x00: Validate firmware in driver 

The get_firmware_crc() callback function isn't flexible
enough when dealing with multiple firmware versions.
It might in some cases be possible that the firmware
file contains multiple CRC checksums.

Create the check_firmware() callback function where the driver
has complete freedom in how to validate the firmware.

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 2009-01-28 00:33:47 +01:00 committed by John W. Linville
parent a2c9b652a1
commit 0cbe006461
5 changed files with 68 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/net/wireless/rt2x00/rt2x00.h
View File

@ -468,9 +468,10 @@ struct rt2x00lib_ops {
*/
int (*probe_hw) (struct rt2x00_dev *rt2x00dev);
char *(*get_firmware_name) (struct rt2x00_dev *rt2x00dev);
u16 (*get_firmware_crc) (const void *data, const size_t len);
int (*load_firmware) (struct rt2x00_dev *rt2x00dev, const void *data,
const size_t len);
int (*check_firmware) (struct rt2x00_dev *rt2x00dev,
const u8 *data, const size_t len);
int (*load_firmware) (struct rt2x00_dev *rt2x00dev,
const u8 *data, const size_t len);
/*
* Device initialization/deinitialization handlers.

27
drivers/net/wireless/rt2x00/rt2x00firmware.c
View File

@ -35,7 +35,6 @@ static int rt2x00lib_request_firmware(struct rt2x00_dev *rt2x00dev)
const struct firmware *fw;
char *fw_name;
int retval;
u16 crc;
/*
* Read correct firmware from harddisk.
@ -61,16 +60,26 @@ static int rt2x00lib_request_firmware(struct rt2x00_dev *rt2x00dev)
return -ENOENT;
}
crc = rt2x00dev->ops->lib->get_firmware_crc(fw->data, fw->size);
if (crc != (fw->data[fw->size - 2] << 8 | fw->data[fw->size - 1])) {
ERROR(rt2x00dev, "Firmware checksum error.\n");
retval = -ENOENT;
goto exit;
}
INFO(rt2x00dev, "Firmware detected - version: %d.%d.\n",
fw->data[fw->size - 4], fw->data[fw->size - 3]);
retval = rt2x00dev->ops->lib->check_firmware(rt2x00dev, fw->data, fw->size);
switch (retval) {
case FW_OK:
break;
case FW_BAD_CRC:
ERROR(rt2x00dev, "Firmware checksum error.\n");
goto exit;
case FW_BAD_LENGTH:
ERROR(rt2x00dev,
"Invalid firmware file length (len=%zu)\n", fw->size);
goto exit;
case FW_BAD_VERSION:
ERROR(rt2x00dev,
"Current firmware does not support detected chipset.\n");
goto exit;
};
rt2x00dev->fw = fw;
return 0;
@ -78,7 +87,7 @@ static int rt2x00lib_request_firmware(struct rt2x00_dev *rt2x00dev)
exit:
release_firmware(fw);
return retval;
return -ENOENT;
}
int rt2x00lib_load_firmware(struct rt2x00_dev *rt2x00dev)

10
drivers/net/wireless/rt2x00/rt2x00reg.h
View File

@ -134,6 +134,16 @@ enum rate_modulation {
RATE_MODE_HT_GREENFIELD = 3,
};
/*
* Firmware validation error codes
*/
enum firmware_errors {
FW_OK,
FW_BAD_CRC,
FW_BAD_LENGTH,
FW_BAD_VERSION,
};
/*
* Register handlers.
* We store the position of a register field inside a field structure,

29
drivers/net/wireless/rt2x00/rt61pci.c
View File

@ -1176,34 +1176,41 @@ static char *rt61pci_get_firmware_name(struct rt2x00_dev *rt2x00dev)
return fw_name;
}
static u16 rt61pci_get_firmware_crc(const void *data, const size_t len)
static int rt61pci_check_firmware(struct rt2x00_dev *rt2x00dev,
const u8 *data, const size_t len)
{
u16 fw_crc;
u16 crc;
/*
* Use the crc itu-t algorithm.
* Only support 8kb firmware files.
*/
if (len != 8192)
return FW_BAD_LENGTH;
/*
* The last 2 bytes in the firmware array are the crc checksum itself,
* this means that we should never pass those 2 bytes to the crc
* algorithm.
*/
fw_crc = (data[len - 2] << 8 | data[len - 1]);
/*
* Use the crc itu-t algorithm.
*/
crc = crc_itu_t(0, data, len - 2);
crc = crc_itu_t_byte(crc, 0);
crc = crc_itu_t_byte(crc, 0);
return crc;
return (fw_crc == crc) ? FW_OK : FW_BAD_CRC;
}
static int rt61pci_load_firmware(struct rt2x00_dev *rt2x00dev, const void *data,
const size_t len)
static int rt61pci_load_firmware(struct rt2x00_dev *rt2x00dev,
const u8 *data, const size_t len)
{
int i;
u32 reg;
if (len != 8192) {
ERROR(rt2x00dev, "Invalid firmware file length (len=%zu)\n", len);
return -ENOENT;
}
/*
* Wait for stable hardware.
*/
@ -2750,7 +2757,7 @@ static const struct rt2x00lib_ops rt61pci_rt2x00_ops = {
.irq_handler = rt61pci_interrupt,
.probe_hw = rt61pci_probe_hw,
.get_firmware_name = rt61pci_get_firmware_name,
.get_firmware_crc = rt61pci_get_firmware_crc,
.check_firmware = rt61pci_check_firmware,
.load_firmware = rt61pci_load_firmware,
.initialize = rt2x00pci_initialize,
.uninitialize = rt2x00pci_uninitialize,

29
drivers/net/wireless/rt2x00/rt73usb.c
View File

@ -1061,35 +1061,42 @@ static char *rt73usb_get_firmware_name(struct rt2x00_dev *rt2x00dev)
return FIRMWARE_RT2571;
}
static u16 rt73usb_get_firmware_crc(const void *data, const size_t len)
static int rt73usb_check_firmware(struct rt2x00_dev *rt2x00dev,
const u8 *data, const size_t len)
{
u16 fw_crc;
u16 crc;
/*
* Use the crc itu-t algorithm.
* Only support 2kb firmware files.
*/
if (len != 2048)
return FW_BAD_LENGTH;
/*
* The last 2 bytes in the firmware array are the crc checksum itself,
* this means that we should never pass those 2 bytes to the crc
* algorithm.
*/
fw_crc = (data[len - 2] << 8 | data[len - 1]);
/*
* Use the crc itu-t algorithm.
*/
crc = crc_itu_t(0, data, len - 2);
crc = crc_itu_t_byte(crc, 0);
crc = crc_itu_t_byte(crc, 0);
return crc;
return (fw_crc == crc) ? FW_OK : FW_BAD_CRC;
}
static int rt73usb_load_firmware(struct rt2x00_dev *rt2x00dev, const void *data,
const size_t len)
static int rt73usb_load_firmware(struct rt2x00_dev *rt2x00dev,
const u8 *data, const size_t len)
{
unsigned int i;
int status;
u32 reg;
if (len != 2048) {
ERROR(rt2x00dev, "Invalid firmware file length (len=%zu)\n", len);
return -ENOENT;
}
/*
* Wait for stable hardware.
*/
@ -2278,7 +2285,7 @@ static const struct ieee80211_ops rt73usb_mac80211_ops = {
static const struct rt2x00lib_ops rt73usb_rt2x00_ops = {
.probe_hw = rt73usb_probe_hw,
.get_firmware_name = rt73usb_get_firmware_name,
.get_firmware_crc = rt73usb_get_firmware_crc,
.check_firmware = rt73usb_check_firmware,
.load_firmware = rt73usb_load_firmware,
.initialize = rt2x00usb_initialize,
.uninitialize = rt2x00usb_uninitialize,