2 * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published
6 * by the Free Software Foundation.
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
17 #include <linux/mtd/mtd.h>
18 #include <linux/mtd/partitions.h>
19 #include <linux/version.h>
20 #include <linux/byteorder/generic.h>
26 * uimage_header itself is only 64B, but it may be prepended with another data.
27 * Currently the biggest size is for Edimax devices: 20B + 64B
29 #define MAX_HEADER_LEN 84
31 #define IH_MAGIC 0x27051956 /* Image Magic Number */
32 #define IH_NMLEN 32 /* Image Name Length */
34 #define IH_OS_LINUX 5 /* Linux */
36 #define IH_TYPE_KERNEL 2 /* OS Kernel Image */
37 #define IH_TYPE_FILESYSTEM 7 /* Filesystem Image */
40 * Legacy format image header,
41 * all data in network byte order (aka natural aka bigendian).
43 struct uimage_header
{
44 uint32_t ih_magic
; /* Image Header Magic Number */
45 uint32_t ih_hcrc
; /* Image Header CRC Checksum */
46 uint32_t ih_time
; /* Image Creation Timestamp */
47 uint32_t ih_size
; /* Image Data Size */
48 uint32_t ih_load
; /* Data Load Address */
49 uint32_t ih_ep
; /* Entry Point Address */
50 uint32_t ih_dcrc
; /* Image Data CRC Checksum */
51 uint8_t ih_os
; /* Operating System */
52 uint8_t ih_arch
; /* CPU architecture */
53 uint8_t ih_type
; /* Image Type */
54 uint8_t ih_comp
; /* Compression Type */
55 uint8_t ih_name
[IH_NMLEN
]; /* Image Name */
59 read_uimage_header(struct mtd_info
*mtd
, size_t offset
, u_char
*buf
,
65 ret
= mtd_read(mtd
, offset
, header_len
, &retlen
, buf
);
67 pr_debug("read error in \"%s\"\n", mtd
->name
);
71 if (retlen
!= header_len
) {
72 pr_debug("short read in \"%s\"\n", mtd
->name
);
80 * __mtdsplit_parse_uimage - scan partition and create kernel + rootfs parts
82 * @find_header: function to call for a block of data that will return offset
83 * of a valid uImage header if found
85 static int __mtdsplit_parse_uimage(struct mtd_info
*master
,
86 const struct mtd_partition
**pparts
,
87 struct mtd_part_parser_data
*data
,
88 ssize_t (*find_header
)(u_char
*buf
, size_t len
))
90 struct mtd_partition
*parts
;
95 size_t uimage_size
= 0;
97 size_t rootfs_size
= 0;
98 int uimage_part
, rf_part
;
100 enum mtdsplit_part_type type
;
103 parts
= kzalloc(nr_parts
* sizeof(*parts
), GFP_KERNEL
);
107 buf
= vmalloc(MAX_HEADER_LEN
);
113 /* find uImage on erase block boundaries */
114 for (offset
= 0; offset
< master
->size
; offset
+= master
->erasesize
) {
115 struct uimage_header
*header
;
119 ret
= read_uimage_header(master
, offset
, buf
, MAX_HEADER_LEN
);
123 ret
= find_header(buf
, MAX_HEADER_LEN
);
125 pr_debug("no valid uImage found in \"%s\" at offset %llx\n",
126 master
->name
, (unsigned long long) offset
);
129 header
= (struct uimage_header
*)(buf
+ ret
);
131 uimage_size
= sizeof(*header
) + be32_to_cpu(header
->ih_size
) + ret
;
132 if ((offset
+ uimage_size
) > master
->size
) {
133 pr_debug("uImage exceeds MTD device \"%s\"\n",
140 if (uimage_size
== 0) {
141 pr_debug("no uImage found in \"%s\"\n", master
->name
);
146 uimage_offset
= offset
;
148 if (uimage_offset
== 0) {
152 /* find the roots after the uImage */
153 ret
= mtd_find_rootfs_from(master
, uimage_offset
+ uimage_size
,
154 master
->size
, &rootfs_offset
, &type
);
156 pr_debug("no rootfs after uImage in \"%s\"\n",
161 rootfs_size
= master
->size
- rootfs_offset
;
162 uimage_size
= rootfs_offset
- uimage_offset
;
167 /* check rootfs presence at offset 0 */
168 ret
= mtd_check_rootfs_magic(master
, 0, &type
);
170 pr_debug("no rootfs before uImage in \"%s\"\n",
176 rootfs_size
= uimage_offset
;
179 if (rootfs_size
== 0) {
180 pr_debug("no rootfs found in \"%s\"\n", master
->name
);
185 parts
[uimage_part
].name
= KERNEL_PART_NAME
;
186 parts
[uimage_part
].offset
= uimage_offset
;
187 parts
[uimage_part
].size
= uimage_size
;
189 if (type
== MTDSPLIT_PART_TYPE_UBI
)
190 parts
[rf_part
].name
= UBI_PART_NAME
;
192 parts
[rf_part
].name
= ROOTFS_PART_NAME
;
193 parts
[rf_part
].offset
= rootfs_offset
;
194 parts
[rf_part
].size
= rootfs_size
;
209 static ssize_t
uimage_verify_default(u_char
*buf
, size_t len
)
211 struct uimage_header
*header
= (struct uimage_header
*)buf
;
213 /* default sanity checks */
214 if (be32_to_cpu(header
->ih_magic
) != IH_MAGIC
) {
215 pr_debug("invalid uImage magic: %08x\n",
216 be32_to_cpu(header
->ih_magic
));
220 if (header
->ih_os
!= IH_OS_LINUX
) {
221 pr_debug("invalid uImage OS: %08x\n",
222 be32_to_cpu(header
->ih_os
));
226 if (header
->ih_type
!= IH_TYPE_KERNEL
) {
227 pr_debug("invalid uImage type: %08x\n",
228 be32_to_cpu(header
->ih_type
));
236 mtdsplit_uimage_parse_generic(struct mtd_info
*master
,
237 const struct mtd_partition
**pparts
,
238 struct mtd_part_parser_data
*data
)
240 return __mtdsplit_parse_uimage(master
, pparts
, data
,
241 uimage_verify_default
);
244 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
245 static const struct of_device_id mtdsplit_uimage_of_match_table
[] = {
246 { .compatible
= "denx,uimage" },
251 static struct mtd_part_parser uimage_generic_parser
= {
252 .owner
= THIS_MODULE
,
254 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
255 .of_match_table
= mtdsplit_uimage_of_match_table
,
257 .parse_fn
= mtdsplit_uimage_parse_generic
,
258 .type
= MTD_PARSER_TYPE_FIRMWARE
,
261 #define FW_MAGIC_WNR2000V1 0x32303031
262 #define FW_MAGIC_WNR2000V3 0x32303033
263 #define FW_MAGIC_WNR2000V4 0x32303034
264 #define FW_MAGIC_WNR2200 0x32323030
265 #define FW_MAGIC_WNR612V2 0x32303631
266 #define FW_MAGIC_WNR1000V2 0x31303031
267 #define FW_MAGIC_WNR1000V2_VC 0x31303030
268 #define FW_MAGIC_WNDR3700 0x33373030
269 #define FW_MAGIC_WNDR3700V2 0x33373031
270 #define FW_MAGIC_WPN824N 0x31313030
272 static ssize_t
uimage_verify_wndr3700(u_char
*buf
, size_t len
)
274 struct uimage_header
*header
= (struct uimage_header
*)buf
;
275 uint8_t expected_type
= IH_TYPE_FILESYSTEM
;
277 switch (be32_to_cpu(header
->ih_magic
)) {
278 case FW_MAGIC_WNR612V2
:
279 case FW_MAGIC_WNR1000V2
:
280 case FW_MAGIC_WNR1000V2_VC
:
281 case FW_MAGIC_WNR2000V1
:
282 case FW_MAGIC_WNR2000V3
:
283 case FW_MAGIC_WNR2200
:
284 case FW_MAGIC_WNDR3700
:
285 case FW_MAGIC_WNDR3700V2
:
286 case FW_MAGIC_WPN824N
:
288 case FW_MAGIC_WNR2000V4
:
289 expected_type
= IH_TYPE_KERNEL
;
295 if (header
->ih_os
!= IH_OS_LINUX
||
296 header
->ih_type
!= expected_type
)
303 mtdsplit_uimage_parse_netgear(struct mtd_info
*master
,
304 const struct mtd_partition
**pparts
,
305 struct mtd_part_parser_data
*data
)
307 return __mtdsplit_parse_uimage(master
, pparts
, data
,
308 uimage_verify_wndr3700
);
311 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
312 static const struct of_device_id mtdsplit_uimage_netgear_of_match_table
[] = {
313 { .compatible
= "netgear,uimage" },
318 static struct mtd_part_parser uimage_netgear_parser
= {
319 .owner
= THIS_MODULE
,
320 .name
= "netgear-fw",
321 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
322 .of_match_table
= mtdsplit_uimage_netgear_of_match_table
,
324 .parse_fn
= mtdsplit_uimage_parse_netgear
,
325 .type
= MTD_PARSER_TYPE_FIRMWARE
,
328 /**************************************************
330 **************************************************/
332 #define FW_EDIMAX_OFFSET 20
333 #define FW_MAGIC_EDIMAX 0x43535953
335 static ssize_t
uimage_find_edimax(u_char
*buf
, size_t len
)
339 if (len
< FW_EDIMAX_OFFSET
+ sizeof(struct uimage_header
)) {
340 pr_err("Buffer too small for checking Edimax header\n");
345 if (be32_to_cpu(*magic
) != FW_MAGIC_EDIMAX
)
348 if (!uimage_verify_default(buf
+ FW_EDIMAX_OFFSET
, len
))
349 return FW_EDIMAX_OFFSET
;
355 mtdsplit_uimage_parse_edimax(struct mtd_info
*master
,
356 const struct mtd_partition
**pparts
,
357 struct mtd_part_parser_data
*data
)
359 return __mtdsplit_parse_uimage(master
, pparts
, data
,
363 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
364 static const struct of_device_id mtdsplit_uimage_edimax_of_match_table
[] = {
365 { .compatible
= "edimax,uimage" },
370 static struct mtd_part_parser uimage_edimax_parser
= {
371 .owner
= THIS_MODULE
,
373 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
374 .of_match_table
= mtdsplit_uimage_edimax_of_match_table
,
376 .parse_fn
= mtdsplit_uimage_parse_edimax
,
377 .type
= MTD_PARSER_TYPE_FIRMWARE
,
380 /**************************************************
382 **************************************************/
384 static int __init
mtdsplit_uimage_init(void)
386 register_mtd_parser(&uimage_generic_parser
);
387 register_mtd_parser(&uimage_netgear_parser
);
388 register_mtd_parser(&uimage_edimax_parser
);
393 module_init(mtdsplit_uimage_init
);