5c7a58764e
Support splitting WRG images, which can be found in older D-Link devices. Signed-off-by: George Hopkins <george-hopkins@null.net>
124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/*
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* Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2014 Felix Fietkau <nbd@nbd.name>
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* Copyright (C) 2016 Stijn Tintel <stijn@linux-ipv6.be>
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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/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/byteorder/generic.h>
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#include "mtdsplit.h"
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#define WRGG_NR_PARTS 2
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#define WRGG_MIN_ROOTFS_OFFS 0x80000 /* 512KiB */
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#define WRGG03_MAGIC 0x20080321
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#define WRG_MAGIC 0x20040220
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struct wrgg03_header {
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char signature[32];
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uint32_t magic1;
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uint32_t magic2;
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char version[16];
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char model[16];
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uint32_t flag[2];
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uint32_t reserve[2];
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char buildno[16];
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uint32_t size;
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uint32_t offset;
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char devname[32];
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char digest[16];
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} __attribute__ ((packed));
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struct wrg_header {
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char signature[32];
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uint32_t magic1;
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uint32_t magic2;
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uint32_t size;
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uint32_t offset;
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char devname[32];
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char digest[16];
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} __attribute__ ((packed));
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static int mtdsplit_parse_wrgg(struct mtd_info *master,
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const struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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{
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struct wrgg03_header hdr;
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size_t hdr_len, retlen, kernel_ent_size;
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size_t rootfs_offset;
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struct mtd_partition *parts;
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enum mtdsplit_part_type type;
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int err;
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hdr_len = sizeof(hdr);
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err = mtd_read(master, 0, hdr_len, &retlen, (void *) &hdr);
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if (err)
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return err;
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if (retlen != hdr_len)
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return -EIO;
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/* sanity checks */
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if (le32_to_cpu(hdr.magic1) == WRGG03_MAGIC) {
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kernel_ent_size = hdr_len + be32_to_cpu(hdr.size);
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} else if (le32_to_cpu(hdr.magic1) == WRG_MAGIC) {
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kernel_ent_size = sizeof(struct wrg_header) + le32_to_cpu(
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((struct wrg_header*)&hdr)->size);
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} else {
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return -EINVAL;
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}
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if (kernel_ent_size > master->size)
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return -EINVAL;
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/*
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* The size in the header covers the rootfs as well.
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* Start the search from an arbitrary offset.
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*/
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err = mtd_find_rootfs_from(master, WRGG_MIN_ROOTFS_OFFS,
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master->size, &rootfs_offset, &type);
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if (err)
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return err;
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parts = kzalloc(WRGG_NR_PARTS * sizeof(*parts), GFP_KERNEL);
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if (!parts)
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return -ENOMEM;
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parts[0].name = KERNEL_PART_NAME;
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parts[0].offset = 0;
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parts[0].size = rootfs_offset;
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parts[1].name = ROOTFS_PART_NAME;
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parts[1].offset = rootfs_offset;
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parts[1].size = master->size - rootfs_offset;
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*pparts = parts;
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return WRGG_NR_PARTS;
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}
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static struct mtd_part_parser mtdsplit_wrgg_parser = {
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.owner = THIS_MODULE,
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.name = "wrgg-fw",
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.parse_fn = mtdsplit_parse_wrgg,
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.type = MTD_PARSER_TYPE_FIRMWARE,
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};
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static int __init mtdsplit_wrgg_init(void)
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{
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register_mtd_parser(&mtdsplit_wrgg_parser);
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return 0;
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}
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subsys_initcall(mtdsplit_wrgg_init);
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