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A number of new (or with recently updated caldata)
Mikrotik devices are using LZ77 magic for wlan tag hard_config data.
New devices include the Chateau LTE12 [1], and ax devices [2]
Newly factory flashed devices may include the hap ac3 [3]
This can be seen in decoded OEM supout [4] dmesg:
"radio data lz77 decompressed from"…
Investigating an arm RouterOS flash.ko module, and supplied example
hard_config dumps, the format was guessed via decompilation and live
debugging [5]. This decoder was then built from the guessed format
specification.
debug prints can be enabled in a DYNAMIC_DEBUG kernel build via the
kernel cmdline:
chosen {
- bootargs = "console=ttyS0,115200";
+ bootargs = "console=ttyS0,115200 dyndbg=\"file drivers/platform/mikrotik/* +p\"";
};
[1]: https://forum.openwrt.org/t/no-wireless-mikrotik-rbd53ig-5hacd2hnd/157763/4
[2]: https://forum.openwrt.org/t/mikrotik-routeros-v7-x-and-openwrt-sysupgrade/148072/17
[3]: https://forum.openwrt.org/t/adding-support-for-mikrotik-hap-ax2/133715/47
[4]: https://github.com/farseeker/go-mikrotik-rif
[5]: https://github.com/john-tho/routeros-wlan-lz77-decode
Signed-off-by: John Thomson <git@johnthomson.fastmail.com.au>
Link: https://github.com/openwrt/openwrt/pull/15774
Signed-off-by: Robert Marko <robimarko@gmail.com>
39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Common definitions for MikroTik RouterBoot data.
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*
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* Copyright (C) 2020 Thibaut VARÈNE <hacks+kernel@slashdirt.org>
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*/
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#ifndef _ROUTERBOOT_H_
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#define _ROUTERBOOT_H_
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#include <linux/types.h>
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// these magic values are stored in cpu-endianness on flash
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#define RB_MAGIC_HARD (('H') | ('a' << 8) | ('r' << 16) | ('d' << 24))
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#define RB_MAGIC_SOFT (('S') | ('o' << 8) | ('f' << 16) | ('t' << 24))
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#define RB_MAGIC_LZOR (('L') | ('Z' << 8) | ('O' << 16) | ('R' << 24))
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#define RB_MAGIC_LZ77 (('L' << 24) | ('Z' << 16) | ('7' << 8) | ('7'))
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#define RB_MAGIC_ERD (('E' << 16) | ('R' << 8) | ('D'))
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#define RB_ART_SIZE 0x10000
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#define RB_MTD_HARD_CONFIG "hard_config"
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#define RB_MTD_SOFT_CONFIG "soft_config"
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int routerboot_tag_find(const u8 *bufhead, const size_t buflen, const u16 tag_id, u16 *pld_ofs, u16 *pld_len);
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int routerboot_rle_decode(const u8 *in, size_t inlen, u8 *out, size_t *outlen);
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int rb_hardconfig_init(struct kobject *rb_kobj, struct mtd_info *mtd);
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void rb_hardconfig_exit(void);
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int rb_softconfig_init(struct kobject *rb_kobj, struct mtd_info *mtd);
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void rb_softconfig_exit(void);
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ssize_t routerboot_tag_show_string(const u8 *pld, u16 pld_len, char *buf);
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ssize_t routerboot_tag_show_u32s(const u8 *pld, u16 pld_len, char *buf);
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#endif /* _ROUTERBOOT_H_ */
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