OpenWrt – Rev 3
?pathlinks?
/*
* Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2014 Felix Fietkau <nbd@nbd.name>
*
* 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/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/byteorder/generic.h>
#include "mtdsplit.h"
#define TPLINK_NR_PARTS 2
#define TPLINK_MIN_ROOTFS_OFFS 0x80000 /* 512KiB */
#define MD5SUM_LEN 16
struct fw_v1 {
char vendor_name[24];
char fw_version[36];
uint32_t hw_id; /* hardware id */
uint32_t hw_rev; /* hardware revision */
uint32_t unk1;
uint8_t md5sum1[MD5SUM_LEN];
uint32_t unk2;
uint8_t md5sum2[MD5SUM_LEN];
uint32_t unk3;
uint32_t kernel_la; /* kernel load address */
uint32_t kernel_ep; /* kernel entry point */
uint32_t fw_length; /* total length of the firmware */
uint32_t kernel_ofs; /* kernel data offset */
uint32_t kernel_len; /* kernel data length */
uint32_t rootfs_ofs; /* rootfs data offset */
uint32_t rootfs_len; /* rootfs data length */
uint32_t boot_ofs; /* bootloader data offset */
uint32_t boot_len; /* bootloader data length */
uint8_t pad[360];
} __attribute__ ((packed));
struct fw_v2 {
char fw_version[48]; /* 0x04: fw version string */
uint32_t hw_id; /* 0x34: hardware id */
uint32_t hw_rev; /* 0x38: FIXME: hardware revision? */
uint32_t unk1; /* 0x3c: 0x00000000 */
uint8_t md5sum1[MD5SUM_LEN]; /* 0x40 */
uint32_t unk2; /* 0x50: 0x00000000 */
uint8_t md5sum2[MD5SUM_LEN]; /* 0x54 */
uint32_t unk3; /* 0x64: 0xffffffff */
uint32_t kernel_la; /* 0x68: kernel load address */
uint32_t kernel_ep; /* 0x6c: kernel entry point */
uint32_t fw_length; /* 0x70: total length of the image */
uint32_t kernel_ofs; /* 0x74: kernel data offset */
uint32_t kernel_len; /* 0x78: kernel data length */
uint32_t rootfs_ofs; /* 0x7c: rootfs data offset */
uint32_t rootfs_len; /* 0x80: rootfs data length */
uint32_t boot_ofs; /* 0x84: FIXME: seems to be unused */
uint32_t boot_len; /* 0x88: FIXME: seems to be unused */
uint16_t unk4; /* 0x8c: 0x55aa */
uint8_t sver_hi; /* 0x8e */
uint8_t sver_lo; /* 0x8f */
uint8_t unk5; /* 0x90: magic: 0xa5 */
uint8_t ver_hi; /* 0x91 */
uint8_t ver_mid; /* 0x92 */
uint8_t ver_lo; /* 0x93 */
uint8_t pad[364];
} __attribute__ ((packed));
struct tplink_fw_header {
uint32_t version;
union {
struct fw_v1 v1;
struct fw_v2 v2;
};
};
static int mtdsplit_parse_tplink(struct mtd_info *master,
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
struct tplink_fw_header hdr;
size_t hdr_len, retlen, kernel_size;
size_t rootfs_offset;
struct mtd_partition *parts;
int err;
hdr_len = sizeof(hdr);
err = mtd_read(master, 0, hdr_len, &retlen, (void *) &hdr);
if (err)
return err;
if (retlen != hdr_len)
return -EIO;
switch (le32_to_cpu(hdr.version)) {
case 1:
if (be32_to_cpu(hdr.v1.kernel_ofs) != sizeof(hdr))
return -EINVAL;
kernel_size = sizeof(hdr) + be32_to_cpu(hdr.v1.kernel_len);
rootfs_offset = be32_to_cpu(hdr.v1.rootfs_ofs);
break;
case 2:
case 3:
if (be32_to_cpu(hdr.v2.kernel_ofs) != sizeof(hdr))
return -EINVAL;
kernel_size = sizeof(hdr) + be32_to_cpu(hdr.v2.kernel_len);
rootfs_offset = be32_to_cpu(hdr.v2.rootfs_ofs);
break;
default:
return -EINVAL;
}
if (kernel_size > master->size)
return -EINVAL;
/* Find the rootfs */
err = mtd_check_rootfs_magic(master, rootfs_offset, NULL);
if (err) {
/*
* The size in the header might cover the rootfs as well.
* Start the search from an arbitrary offset.
*/
err = mtd_find_rootfs_from(master, TPLINK_MIN_ROOTFS_OFFS,
master->size, &rootfs_offset, NULL);
if (err)
return err;
}
parts = kzalloc(TPLINK_NR_PARTS * sizeof(*parts), GFP_KERNEL);
if (!parts)
return -ENOMEM;
parts[0].name = KERNEL_PART_NAME;
parts[0].offset = 0;
parts[0].size = kernel_size;
parts[1].name = ROOTFS_PART_NAME;
parts[1].offset = rootfs_offset;
parts[1].size = master->size - rootfs_offset;
*pparts = parts;
return TPLINK_NR_PARTS;
}
static struct mtd_part_parser mtdsplit_tplink_parser = {
.owner = THIS_MODULE,
.name = "tplink-fw",
.parse_fn = mtdsplit_parse_tplink,
.type = MTD_PARSER_TYPE_FIRMWARE,
};
static int __init mtdsplit_tplink_init(void)
{
register_mtd_parser(&mtdsplit_tplink_parser);
return 0;
}
subsys_initcall(mtdsplit_tplink_init);