Initial commit
This commit is contained in:
domenico
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/*
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* Copyright (C) 2013 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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/vmalloc.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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/*
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* uimage_header itself is only 64B, but it may be prepended with another data.
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* Currently the biggest size is for Edimax devices: 20B + 64B
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*/
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#define MAX_HEADER_LEN 84
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#define IH_MAGIC 0x27051956 /* Image Magic Number */
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#define IH_NMLEN 32 /* Image Name Length */
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#define IH_OS_LINUX 5 /* Linux */
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#define IH_TYPE_KERNEL 2 /* OS Kernel Image */
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#define IH_TYPE_FILESYSTEM 7 /* Filesystem Image */
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/*
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* Legacy format image header,
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* all data in network byte order (aka natural aka bigendian).
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*/
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struct uimage_header {
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uint32_t ih_magic; /* Image Header Magic Number */
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uint32_t ih_hcrc; /* Image Header CRC Checksum */
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uint32_t ih_time; /* Image Creation Timestamp */
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uint32_t ih_size; /* Image Data Size */
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uint32_t ih_load; /* Data Load Address */
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uint32_t ih_ep; /* Entry Point Address */
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uint32_t ih_dcrc; /* Image Data CRC Checksum */
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uint8_t ih_os; /* Operating System */
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uint8_t ih_arch; /* CPU architecture */
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uint8_t ih_type; /* Image Type */
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uint8_t ih_comp; /* Compression Type */
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uint8_t ih_name[IH_NMLEN]; /* Image Name */
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};
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static int
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read_uimage_header(struct mtd_info *mtd, size_t offset, u_char *buf,
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size_t header_len)
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{
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size_t retlen;
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int ret;
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ret = mtd_read(mtd, offset, header_len, &retlen, buf);
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if (ret) {
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pr_debug("read error in \"%s\"\n", mtd->name);
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return ret;
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}
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if (retlen != header_len) {
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pr_debug("short read in \"%s\"\n", mtd->name);
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return -EIO;
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}
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return 0;
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}
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/**
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* __mtdsplit_parse_uimage - scan partition and create kernel + rootfs parts
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*
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* @find_header: function to call for a block of data that will return offset
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* of a valid uImage header if found
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*/
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static int __mtdsplit_parse_uimage(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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ssize_t (*find_header)(u_char *buf, size_t len))
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{
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struct mtd_partition *parts;
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u_char *buf;
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int nr_parts;
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size_t offset;
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size_t uimage_offset;
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size_t uimage_size = 0;
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size_t rootfs_offset;
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size_t rootfs_size = 0;
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int uimage_part, rf_part;
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int ret;
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enum mtdsplit_part_type type;
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nr_parts = 2;
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parts = kzalloc(nr_parts * sizeof(*parts), GFP_KERNEL);
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if (!parts)
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return -ENOMEM;
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buf = vmalloc(MAX_HEADER_LEN);
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if (!buf) {
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ret = -ENOMEM;
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goto err_free_parts;
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}
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/* find uImage on erase block boundaries */
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for (offset = 0; offset < master->size; offset += master->erasesize) {
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struct uimage_header *header;
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uimage_size = 0;
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ret = read_uimage_header(master, offset, buf, MAX_HEADER_LEN);
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if (ret)
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continue;
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ret = find_header(buf, MAX_HEADER_LEN);
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if (ret < 0) {
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pr_debug("no valid uImage found in \"%s\" at offset %llx\n",
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master->name, (unsigned long long) offset);
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continue;
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}
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header = (struct uimage_header *)(buf + ret);
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uimage_size = sizeof(*header) + be32_to_cpu(header->ih_size) + ret;
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if ((offset + uimage_size) > master->size) {
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pr_debug("uImage exceeds MTD device \"%s\"\n",
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master->name);
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continue;
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}
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break;
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}
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if (uimage_size == 0) {
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pr_debug("no uImage found in \"%s\"\n", master->name);
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ret = -ENODEV;
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goto err_free_buf;
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}
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uimage_offset = offset;
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if (uimage_offset == 0) {
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uimage_part = 0;
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rf_part = 1;
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/* find the roots after the uImage */
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ret = mtd_find_rootfs_from(master, uimage_offset + uimage_size,
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master->size, &rootfs_offset, &type);
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if (ret) {
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pr_debug("no rootfs after uImage in \"%s\"\n",
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master->name);
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goto err_free_buf;
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}
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rootfs_size = master->size - rootfs_offset;
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uimage_size = rootfs_offset - uimage_offset;
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} else {
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rf_part = 0;
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uimage_part = 1;
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/* check rootfs presence at offset 0 */
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ret = mtd_check_rootfs_magic(master, 0, &type);
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if (ret) {
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pr_debug("no rootfs before uImage in \"%s\"\n",
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master->name);
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goto err_free_buf;
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}
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rootfs_offset = 0;
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rootfs_size = uimage_offset;
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}
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if (rootfs_size == 0) {
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pr_debug("no rootfs found in \"%s\"\n", master->name);
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ret = -ENODEV;
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goto err_free_buf;
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}
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parts[uimage_part].name = KERNEL_PART_NAME;
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parts[uimage_part].offset = uimage_offset;
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parts[uimage_part].size = uimage_size;
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if (type == MTDSPLIT_PART_TYPE_UBI)
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parts[rf_part].name = UBI_PART_NAME;
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else
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parts[rf_part].name = ROOTFS_PART_NAME;
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parts[rf_part].offset = rootfs_offset;
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parts[rf_part].size = rootfs_size;
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vfree(buf);
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*pparts = parts;
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return nr_parts;
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err_free_buf:
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vfree(buf);
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err_free_parts:
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kfree(parts);
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return ret;
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}
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static ssize_t uimage_verify_default(u_char *buf, size_t len)
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{
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struct uimage_header *header = (struct uimage_header *)buf;
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/* default sanity checks */
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if (be32_to_cpu(header->ih_magic) != IH_MAGIC) {
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pr_debug("invalid uImage magic: %08x\n",
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be32_to_cpu(header->ih_magic));
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return -EINVAL;
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}
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if (header->ih_os != IH_OS_LINUX) {
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pr_debug("invalid uImage OS: %08x\n",
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be32_to_cpu(header->ih_os));
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return -EINVAL;
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}
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if (header->ih_type != IH_TYPE_KERNEL) {
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pr_debug("invalid uImage type: %08x\n",
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be32_to_cpu(header->ih_type));
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return -EINVAL;
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}
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return 0;
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}
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static int
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mtdsplit_uimage_parse_generic(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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return __mtdsplit_parse_uimage(master, pparts, data,
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uimage_verify_default);
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}
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static struct mtd_part_parser uimage_generic_parser = {
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.owner = THIS_MODULE,
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.name = "uimage-fw",
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.parse_fn = mtdsplit_uimage_parse_generic,
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.type = MTD_PARSER_TYPE_FIRMWARE,
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};
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#define FW_MAGIC_WNR2000V1 0x32303031
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#define FW_MAGIC_WNR2000V3 0x32303033
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#define FW_MAGIC_WNR2000V4 0x32303034
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#define FW_MAGIC_WNR2200 0x32323030
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#define FW_MAGIC_WNR612V2 0x32303631
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#define FW_MAGIC_WNR1000V2 0x31303031
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#define FW_MAGIC_WNR1000V2_VC 0x31303030
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#define FW_MAGIC_WNDR3700 0x33373030
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#define FW_MAGIC_WNDR3700V2 0x33373031
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#define FW_MAGIC_WPN824N 0x31313030
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static ssize_t uimage_verify_wndr3700(u_char *buf, size_t len)
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{
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struct uimage_header *header = (struct uimage_header *)buf;
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uint8_t expected_type = IH_TYPE_FILESYSTEM;
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switch (be32_to_cpu(header->ih_magic)) {
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case FW_MAGIC_WNR612V2:
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case FW_MAGIC_WNR1000V2:
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case FW_MAGIC_WNR1000V2_VC:
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case FW_MAGIC_WNR2000V1:
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case FW_MAGIC_WNR2000V3:
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case FW_MAGIC_WNR2200:
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case FW_MAGIC_WNDR3700:
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case FW_MAGIC_WNDR3700V2:
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case FW_MAGIC_WPN824N:
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break;
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case FW_MAGIC_WNR2000V4:
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expected_type = IH_TYPE_KERNEL;
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break;
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default:
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return -EINVAL;
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}
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if (header->ih_os != IH_OS_LINUX ||
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header->ih_type != expected_type)
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return -EINVAL;
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return 0;
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}
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static int
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mtdsplit_uimage_parse_netgear(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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return __mtdsplit_parse_uimage(master, pparts, data,
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uimage_verify_wndr3700);
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}
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static struct mtd_part_parser uimage_netgear_parser = {
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.owner = THIS_MODULE,
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.name = "netgear-fw",
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.parse_fn = mtdsplit_uimage_parse_netgear,
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.type = MTD_PARSER_TYPE_FIRMWARE,
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};
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/**************************************************
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* Edimax
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**************************************************/
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#define FW_EDIMAX_OFFSET 20
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#define FW_MAGIC_EDIMAX 0x43535953
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static ssize_t uimage_find_edimax(u_char *buf, size_t len)
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{
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u32 *magic;
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if (len < FW_EDIMAX_OFFSET + sizeof(struct uimage_header)) {
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pr_err("Buffer too small for checking Edimax header\n");
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return -ENOSPC;
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}
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magic = (u32 *)buf;
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if (be32_to_cpu(*magic) != FW_MAGIC_EDIMAX)
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return -EINVAL;
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if (!uimage_verify_default(buf + FW_EDIMAX_OFFSET, len))
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return FW_EDIMAX_OFFSET;
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return -EINVAL;
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}
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static int
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mtdsplit_uimage_parse_edimax(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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return __mtdsplit_parse_uimage(master, pparts, data,
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uimage_find_edimax);
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}
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static struct mtd_part_parser uimage_edimax_parser = {
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.owner = THIS_MODULE,
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.name = "edimax-fw",
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.parse_fn = mtdsplit_uimage_parse_edimax,
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.type = MTD_PARSER_TYPE_FIRMWARE,
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};
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/**************************************************
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* Init
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**************************************************/
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static int __init mtdsplit_uimage_init(void)
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{
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register_mtd_parser(&uimage_generic_parser);
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register_mtd_parser(&uimage_netgear_parser);
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register_mtd_parser(&uimage_edimax_parser);
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return 0;
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}
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module_init(mtdsplit_uimage_init);
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