firmware-utils: kernel image generator for TP-Link RE450

The firmware image that is used in TP-Link RE450 (and some more devices from
the RE series) is tplink-safeloader.
In the kernel partition, the kernel is compressed in a regular tp-link
firmware that is just used for booting. Since it is only used for compressing
and booting, only four fields are filled in the header:
Vendor, version, kernel load address and kernel entry point.
mktplinkfw-kernel is a simpler version of mktpolinkfw that generate such
images. It also specifies the hardware id (as it is in the product info
section), so when doing a sysupgrade - the existing code will check for
hardware compatibility.

Signed-off-by: Tal Keren <kooolk@gmail.com>
[rd@radekdostal.com: add build target to .../image/tp-link.mk]
Signed-off-by: Radek Dostál <rd@radekdostal.com>
This commit is contained in:
Tal Keren 2016-01-07 02:40:47 +02:00 committed by Jo-Philipp Wich
parent 87b0747263
commit 0d9d980ecd
3 changed files with 363 additions and 0 deletions

View File

@ -35,6 +35,16 @@ define Build/mktplinkfw-combined
@mv $@.new $@
endef
# add RE450 and similar header to the kernel image
define Build/mktplinkfw-kernel
$(STAGING_DIR_HOST)/bin/mktplinkfw-kernel \
-H $(TPLINK_HWID) -N OpenWrt -V $(REVISION) \
-L $(KERNEL_LOADADDR) -E $(KERNEL_LOADADDR) \
-k $@ \
-o $@.new
@mv $@.new $@
endef
define Device/tplink
TPLINK_HWREV := 0x1
TPLINK_HEADER_VERSION := 1

View File

@ -41,6 +41,7 @@ define Host/Compile
$(call cc,mkplanexfw sha1)
$(call cc,mktplinkfw md5, -Wall)
$(call cc,mktplinkfw2 md5)
$(call cc,mktplinkfw-kernel)
$(call cc,tplink-safeloader md5, -Wall)
$(call cc,pc1crypt)
$(call cc,osbridge-crc)

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@ -0,0 +1,352 @@
/*
* Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2016 Tal Keren <kooolk@gmail.com>
*
* Stripped down version of the regular tplink firmware that is only used
* for compressing and booting the kernel.
*
* This tool was based on:
* TP-Link WR941 V2 firmware checksum fixing tool.
* Copyright (C) 2008,2009 Wang Jian <lark@linux.net.cn>
*
* 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.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h> /* for unlink() */
#include <libgen.h>
#include <getopt.h> /* for getopt() */
#include <stdarg.h>
#include <errno.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#define ALIGN(x,a) ({ typeof(a) __a = (a); (((x) + __a - 1) & ~(__a - 1)); })
#define HEADER_VERSION_V1 0x01000000
#define MD5SUM_LEN 16
struct file_info {
char *file_name; /* name of the file */
uint32_t file_size; /* length of the file */
};
struct fw_header {
uint32_t version; /* header version */
char vendor_name[24];
char fw_version[36];
uint32_t hw_id; /* hardware id */
uint32_t hw_rev; /* hardware revision */
uint32_t unk1;
uint8_t md5sum1[MD5SUM_LEN];
uint32_t unk2;
uint8_t md5sum2[MD5SUM_LEN];
uint32_t unk3;
uint32_t kernel_la; /* kernel load address */
uint32_t kernel_ep; /* kernel entry point */
uint32_t fw_length; /* total length of the firmware */
uint32_t kernel_ofs; /* kernel data offset */
uint32_t kernel_len; /* kernel data length */
uint32_t rootfs_ofs; /* rootfs data offset */
uint32_t rootfs_len; /* rootfs data length */
uint32_t boot_ofs; /* bootloader data offset */
uint32_t boot_len; /* bootloader data length */
uint16_t ver_hi;
uint16_t ver_mid;
uint16_t ver_lo;
uint8_t pad[354];
} __attribute__ ((packed));
/*
* Globals
*/
static char *ofname;
static char *progname;
static char *vendor = "TP-LINK Technologies";
static char *version = "ver. 1.0";
static char *fw_ver = "0.0.0";
static uint32_t hdr_ver = HEADER_VERSION_V1;
static char *opt_hw_id;
static uint32_t hw_id = 0;
static struct file_info kernel_info;
static uint32_t kernel_la = 0;
static uint32_t kernel_ep = 0;
static uint32_t kernel_len = 0;
/*
* Message macros
*/
#define ERR(fmt, ...) do { \
fflush(0); \
fprintf(stderr, "[%s] *** error: " fmt "\n", \
progname, ## __VA_ARGS__ ); \
} while (0)
#define ERRS(fmt, ...) do { \
int save = errno; \
fflush(0); \
fprintf(stderr, "[%s] *** error: " fmt ": %s\n", \
progname, ## __VA_ARGS__, strerror(save)); \
} while (0)
#define DBG(fmt, ...) do { \
fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
} while (0)
static void usage(int status)
{
FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
struct board_info *board;
fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
fprintf(stream,
"\n"
"Options:\n"
" -E <ep> kernel entry point with <ep> (hexval prefixed with 0x)\n"
" -L <la> kernel load address with <la> (hexval prefixed with 0x)\n"
" -H <hwid> use hardware id specified with <hwid>\n"
" -k <file> read kernel image from the file <file>\n"
" -o <file> write output to the file <file>\n"
" -N <vendor> set image vendor to <vendor>\n"
" -V <version> set image version to <version>\n"
" -h show this screen\n"
);
exit(status);
}
static int get_file_stat(struct file_info *fdata)
{
struct stat st;
int res;
if (fdata->file_name == NULL)
return 0;
res = stat(fdata->file_name, &st);
if (res){
ERRS("stat failed on %s", fdata->file_name);
return res;
}
fdata->file_size = st.st_size;
return 0;
}
static int read_to_buf(struct file_info *fdata, char *buf)
{
FILE *f;
int ret = EXIT_FAILURE;
f = fopen(fdata->file_name, "r");
if (f == NULL) {
ERRS("could not open \"%s\" for reading", fdata->file_name);
goto out;
}
errno = 0;
fread(buf, fdata->file_size, 1, f);
if (errno != 0) {
ERRS("unable to read from file \"%s\"", fdata->file_name);
goto out_close;
}
ret = EXIT_SUCCESS;
out_close:
fclose(f);
out:
return ret;
}
static int check_options(void)
{
int ret;
if (opt_hw_id) {
hw_id = strtoul(opt_hw_id, NULL, 0);
}
if (!kernel_la || !kernel_ep) {
ERR("kernel loading address and entry point must be specified");
return -1;
}
if (kernel_info.file_name == NULL) {
ERR("no kernel image specified");
return -1;
}
ret = get_file_stat(&kernel_info);
if (ret)
return ret;
kernel_len = kernel_info.file_size;
if (ofname == NULL) {
ERR("no output file specified");
return -1;
}
return 0;
}
static void fill_header(char *buf)
{
struct fw_header *hdr = (struct fw_header *)buf;
memset(hdr, 0, sizeof(struct fw_header));
hdr->version = htonl(hdr_ver);
strncpy(hdr->vendor_name, vendor, sizeof(hdr->vendor_name));
strncpy(hdr->fw_version, version, sizeof(hdr->fw_version));
/**
* This field is ignored and not specified in stock firmware
* It is specified here to ensure sysupgrade hardware compatibility
* The hardware id of a device is in the product-info partition
*/
hdr->hw_id = htonl(hw_id);
hdr->kernel_la = htonl(kernel_la);
hdr->kernel_ep = htonl(kernel_ep);
hdr->kernel_ofs = htonl(sizeof(struct fw_header));
hdr->kernel_len = htonl(kernel_len);
}
static int write_fw(char *data, int len)
{
FILE *f;
int ret = EXIT_FAILURE;
f = fopen(ofname, "w");
if (f == NULL) {
ERRS("could not open \"%s\" for writing", ofname);
goto out;
}
errno = 0;
fwrite(data, len, 1, f);
if (errno) {
ERRS("unable to write output file");
goto out_flush;
}
DBG("firmware file \"%s\" completed", ofname);
ret = EXIT_SUCCESS;
out_flush:
fflush(f);
fclose(f);
if (ret != EXIT_SUCCESS) {
unlink(ofname);
}
out:
return ret;
}
static int build_fw(void)
{
int buflen;
char *buf;
char *p;
int ret = EXIT_FAILURE;
buflen = sizeof(struct fw_header) + kernel_len;
buflen = ALIGN(buflen, 0x4);
buf = malloc(buflen);
if (!buf) {
ERR("no memory for buffer\n");
goto out;
}
memset(buf, 0, buflen);
p = buf + sizeof(struct fw_header);
ret = read_to_buf(&kernel_info, p);
if (ret)
goto out_free_buf;
fill_header(buf);
ret = write_fw(buf, buflen);
if (ret)
goto out_free_buf;
ret = EXIT_SUCCESS;
out_free_buf:
free(buf);
out:
return ret;
}
int main(int argc, char *argv[])
{
int ret = EXIT_FAILURE;
int err;
FILE *outfile;
progname = basename(argv[0]);
while ( 1 ) {
int c;
c = getopt(argc, argv, "H:E:L:V:N:k:o:h");
if (c == -1)
break;
switch (c) {
case 'H':
opt_hw_id = optarg;
break;
case 'E':
sscanf(optarg, "0x%x", &kernel_ep);
break;
case 'L':
sscanf(optarg, "0x%x", &kernel_la);
break;
case 'V':
version = optarg;
break;
case 'N':
vendor = optarg;
break;
case 'k':
kernel_info.file_name = optarg;
break;
case 'o':
ofname = optarg;
break;
case 'h':
usage(EXIT_SUCCESS);
break;
default:
usage(EXIT_FAILURE);
break;
}
}
ret = check_options();
if (ret)
goto out;
ret = build_fw();
out:
return ret;
}