--- /dev/null
+/*
+ * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * 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.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/byteorder/generic.h>
+
+#include "mtdsplit.h"
+
+#define IH_MAGIC 0x27051956 /* Image Magic Number */
+#define IH_NMLEN 32 /* Image Name Length */
+
+#define IH_OS_LINUX 5 /* Linux */
+
+#define IH_TYPE_KERNEL 2 /* OS Kernel Image */
+#define IH_TYPE_FILESYSTEM 7 /* Filesystem Image */
+
+/*
+ * Legacy format image header,
+ * all data in network byte order (aka natural aka bigendian).
+ */
+struct uimage_header {
+ uint32_t ih_magic; /* Image Header Magic Number */
+ uint32_t ih_hcrc; /* Image Header CRC Checksum */
+ uint32_t ih_time; /* Image Creation Timestamp */
+ uint32_t ih_size; /* Image Data Size */
+ uint32_t ih_load; /* Data Load Address */
+ uint32_t ih_ep; /* Entry Point Address */
+ uint32_t ih_dcrc; /* Image Data CRC Checksum */
+ uint8_t ih_os; /* Operating System */
+ uint8_t ih_arch; /* CPU architecture */
+ uint8_t ih_type; /* Image Type */
+ uint8_t ih_comp; /* Compression Type */
+ uint8_t ih_name[IH_NMLEN]; /* Image Name */
+};
+
+static int
+read_uimage_header(struct mtd_info *mtd, size_t offset,
+ struct uimage_header *header)
+{
+ size_t header_len;
+ size_t retlen;
+ int ret;
+
+ header_len = sizeof(*header);
+ ret = mtd_read(mtd, offset, header_len, &retlen,
+ (unsigned char *) header);
+ if (ret) {
+ pr_debug("read error in \"%s\"\n", mtd->name);
+ return ret;
+ }
+
+ if (retlen != header_len) {
+ pr_debug("short read in \"%s\"\n", mtd->name);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int __mtdsplit_parse_uimage(struct mtd_info *master,
+ struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data,
+ bool (*verify)(struct uimage_header *hdr))
+{
+ struct mtd_partition *parts;
+ struct uimage_header *header;
+ int nr_parts;
+ size_t offset;
+ size_t uimage_offset;
+ size_t uimage_size = 0;
+ size_t rootfs_offset;
+ size_t rootfs_size = 0;
+ int uimage_part, rf_part;
+ int ret;
+
+ nr_parts = 2;
+ parts = kzalloc(nr_parts * sizeof(*parts), GFP_KERNEL);
+ if (!parts)
+ return -ENOMEM;
+
+ header = vmalloc(sizeof(*header));
+ if (!header) {
+ ret = -ENOMEM;
+ goto err_free_parts;
+ }
+
+ /* find uImage on erase block boundaries */
+ for (offset = 0; offset < master->size; offset += master->erasesize) {
+ uimage_size = 0;
+
+ ret = read_uimage_header(master, offset, header);
+ if (ret)
+ continue;
+
+ if (!verify(header)) {
+ pr_debug("no valid uImage found in \"%s\" at offset %llx\n",
+ master->name, (unsigned long long) offset);
+ continue;
+ }
+
+ uimage_size = sizeof(*header) + be32_to_cpu(header->ih_size);
+ if ((offset + uimage_size) > master->size) {
+ pr_debug("uImage exceeds MTD device \"%s\"\n",
+ master->name);
+ continue;
+ }
+ break;
+ }
+
+ if (uimage_size == 0) {
+ pr_debug("no uImage found in \"%s\"\n", master->name);
+ ret = -ENODEV;
+ goto err_free_header;
+ }
+
+ uimage_offset = offset;
+
+ if (uimage_offset == 0) {
+ uimage_part = 0;
+ rf_part = 1;
+
+ /* find the roots after the uImage */
+ ret = mtd_find_rootfs_from(master,
+ uimage_offset + uimage_size,
+ master->size,
+ &rootfs_offset);
+ if (ret) {
+ pr_debug("no rootfs after uImage in \"%s\"\n",
+ master->name);
+ goto err_free_header;
+ }
+
+ rootfs_size = master->size - rootfs_offset;
+ uimage_size = rootfs_offset - uimage_offset;
+ } else {
+ rf_part = 0;
+ uimage_part = 1;
+
+ /* check rootfs presence at offset 0 */
+ ret = mtd_check_rootfs_magic(master, 0);
+ if (ret) {
+ pr_debug("no rootfs before uImage in \"%s\"\n",
+ master->name);
+ goto err_free_header;
+ }
+
+ rootfs_offset = 0;
+ rootfs_size = uimage_offset;
+ }
+
+ if (rootfs_size == 0) {
+ pr_debug("no rootfs found in \"%s\"\n", master->name);
+ ret = -ENODEV;
+ goto err_free_header;
+ }
+
+ parts[uimage_part].name = KERNEL_PART_NAME;
+ parts[uimage_part].offset = uimage_offset;
+ parts[uimage_part].size = uimage_size;
+
+ parts[rf_part].name = ROOTFS_PART_NAME;
+ parts[rf_part].offset = rootfs_offset;
+ parts[rf_part].size = rootfs_size;
+
+ vfree(header);
+
+ *pparts = parts;
+ return nr_parts;
+
+err_free_header:
+ vfree(header);
+
+err_free_parts:
+ kfree(parts);
+ return ret;
+}
+
+static bool uimage_verify_default(struct uimage_header *header)
+{
+ /* default sanity checks */
+ if (be32_to_cpu(header->ih_magic) != IH_MAGIC) {
+ pr_debug("invalid uImage magic: %08x\n",
+ be32_to_cpu(header->ih_magic));
+ return false;
+ }
+
+ if (header->ih_os != IH_OS_LINUX) {
+ pr_debug("invalid uImage OS: %08x\n",
+ be32_to_cpu(header->ih_os));
+ return false;
+ }
+
+ if (header->ih_type != IH_TYPE_KERNEL) {
+ pr_debug("invalid uImage type: %08x\n",
+ be32_to_cpu(header->ih_type));
+ return false;
+ }
+
+ return true;
+}
+
+static int
+mtdsplit_uimage_parse_generic(struct mtd_info *master,
+ struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data)
+{
+ return __mtdsplit_parse_uimage(master, pparts, data,
+ uimage_verify_default);
+}
+
+static struct mtd_part_parser uimage_generic_parser = {
+ .owner = THIS_MODULE,
+ .name = "uimage-fw",
+ .parse_fn = mtdsplit_uimage_parse_generic,
+ .type = MTD_PARSER_TYPE_FIRMWARE,
+};
+
+#define FW_MAGIC_WNR2000V3 0x32303033
+#define FW_MAGIC_WNR612V2 0x32303631
+#define FW_MAGIC_WNDR3700 0x33373030
+#define FW_MAGIC_WNDR3700V2 0x33373031
+
+static bool uimage_verify_wndr3700(struct uimage_header *header)
+{
+ switch be32_to_cpu(header->ih_magic) {
+ case FW_MAGIC_WNR612V2:
+ case FW_MAGIC_WNR2000V3:
+ case FW_MAGIC_WNDR3700:
+ case FW_MAGIC_WNDR3700V2:
+ break;
+ default:
+ return false;
+ }
+
+ if (header->ih_os != IH_OS_LINUX ||
+ header->ih_type != IH_TYPE_FILESYSTEM)
+ return false;
+
+ return true;
+}
+
+static int
+mtdsplit_uimage_parse_netgear(struct mtd_info *master,
+ struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data)
+{
+ return __mtdsplit_parse_uimage(master, pparts, data,
+ uimage_verify_wndr3700);
+}
+
+static struct mtd_part_parser uimage_netgear_parser = {
+ .owner = THIS_MODULE,
+ .name = "netgear-fw",
+ .parse_fn = mtdsplit_uimage_parse_netgear,
+ .type = MTD_PARSER_TYPE_FIRMWARE,
+};
+
+static int mtdsplit_uimage_init(void)
+{
+ int ret;
+
+ ret = register_mtd_parser(&uimage_generic_parser);
+ if (ret)
+ return ret;
+
+ ret = register_mtd_parser(&uimage_netgear_parser);
+ if (ret)
+ goto err_unregister_generic;
+
+ return 0;
+
+err_unregister_generic:
+ deregister_mtd_parser(&uimage_generic_parser);
+ return ret;
+}
+
+module_init(mtdsplit_uimage_init);
\ No newline at end of file
projects / openwrt.git / commitdiff