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Signed-off-by: Gabor Juhos <juhosg@openwrt.org> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33950 3c298f89-4303-0410-b956-a3cf2f4a3e73
198 lines
4.4 KiB
C
198 lines
4.4 KiB
C
/*
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* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/magic.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#define TPLINK_NUM_PARTS 5
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#define TPLINK_HEADER_V1 0x01000000
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#define MD5SUM_LEN 16
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#define TPLINK_ART_LEN 0x10000
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#define TPLINK_KERNEL_OFFS 0x20000
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struct tplink_fw_header {
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uint32_t version; /* header version */
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char vendor_name[24];
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char fw_version[36];
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uint32_t hw_id; /* hardware id */
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uint32_t hw_rev; /* hardware revision */
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uint32_t unk1;
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uint8_t md5sum1[MD5SUM_LEN];
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uint32_t unk2;
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uint8_t md5sum2[MD5SUM_LEN];
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uint32_t unk3;
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uint32_t kernel_la; /* kernel load address */
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uint32_t kernel_ep; /* kernel entry point */
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uint32_t fw_length; /* total length of the firmware */
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uint32_t kernel_ofs; /* kernel data offset */
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uint32_t kernel_len; /* kernel data length */
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uint32_t rootfs_ofs; /* rootfs data offset */
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uint32_t rootfs_len; /* rootfs data length */
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uint32_t boot_ofs; /* bootloader data offset */
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uint32_t boot_len; /* bootloader data length */
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uint8_t pad[360];
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} __attribute__ ((packed));
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static struct tplink_fw_header *
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tplink_read_header(struct mtd_info *mtd, size_t offset)
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{
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struct tplink_fw_header *header;
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size_t header_len;
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size_t retlen;
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int ret;
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u32 t;
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header = vmalloc(sizeof(*header));
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if (!header)
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goto err;
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header_len = sizeof(struct tplink_fw_header);
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ret = mtd_read(mtd, offset, header_len, &retlen,
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(unsigned char *) header);
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if (ret)
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goto err_free_header;
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if (retlen != header_len)
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goto err_free_header;
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/* sanity checks */
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t = be32_to_cpu(header->version);
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if (t != TPLINK_HEADER_V1)
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goto err_free_header;
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t = be32_to_cpu(header->kernel_ofs);
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if (t != header_len)
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goto err_free_header;
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return header;
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err_free_header:
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vfree(header);
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err:
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return NULL;
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}
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static int tplink_check_rootfs_magic(struct mtd_info *mtd, size_t offset)
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{
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u32 magic;
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size_t retlen;
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int ret;
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ret = mtd_read(mtd, offset, sizeof(magic), &retlen,
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(unsigned char *) &magic);
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if (ret)
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return ret;
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if (retlen != sizeof(magic))
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return -EIO;
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if (le32_to_cpu(magic) != SQUASHFS_MAGIC &&
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magic != 0x19852003)
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return -EINVAL;
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return 0;
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}
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static int tplink_parse_partitions(struct mtd_info *master,
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struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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{
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struct mtd_partition *parts;
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struct tplink_fw_header *header;
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int nr_parts;
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size_t offset;
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size_t art_offset;
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size_t rootfs_offset;
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size_t squashfs_offset;
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int ret;
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nr_parts = TPLINK_NUM_PARTS;
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parts = kzalloc(nr_parts * sizeof(struct mtd_partition), GFP_KERNEL);
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if (!parts) {
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ret = -ENOMEM;
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goto err;
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}
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offset = TPLINK_KERNEL_OFFS;
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header = tplink_read_header(master, offset);
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if (!header) {
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pr_notice("%s: no TP-Link header found\n", master->name);
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ret = -ENODEV;
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goto err_free_parts;
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}
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squashfs_offset = offset + sizeof(struct tplink_fw_header) +
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be32_to_cpu(header->kernel_len);
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ret = tplink_check_rootfs_magic(master, squashfs_offset);
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if (ret == 0)
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rootfs_offset = squashfs_offset;
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else
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rootfs_offset = offset + be32_to_cpu(header->rootfs_ofs);
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art_offset = master->size - TPLINK_ART_LEN;
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parts[0].name = "u-boot";
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parts[0].offset = 0;
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parts[0].size = offset;
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parts[0].mask_flags = MTD_WRITEABLE;
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parts[1].name = "kernel";
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parts[1].offset = offset;
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parts[1].size = rootfs_offset - offset;
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parts[2].name = "rootfs";
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parts[2].offset = rootfs_offset;
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parts[2].size = art_offset - rootfs_offset;
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parts[3].name = "art";
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parts[3].offset = art_offset;
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parts[3].size = TPLINK_ART_LEN;
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parts[3].mask_flags = MTD_WRITEABLE;
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parts[4].name = "firmware";
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parts[4].offset = offset;
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parts[4].size = art_offset - offset;
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vfree(header);
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*pparts = parts;
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return nr_parts;
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err_free_parts:
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kfree(parts);
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err:
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*pparts = NULL;
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return ret;
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}
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static struct mtd_part_parser tplink_parser = {
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.owner = THIS_MODULE,
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.parse_fn = tplink_parse_partitions,
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.name = "tp-link",
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};
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static int __init tplink_parser_init(void)
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{
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return register_mtd_parser(&tplink_parser);
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}
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module_init(tplink_parser_init);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
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