From 31e99fe3daea9c402571c0bfa42e5d0d17d06809 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Thibaut=20VAR=C3=88NE?= Date: Fri, 27 Mar 2020 14:33:48 +0100 Subject: [PATCH] generic: platform/mikrotik: support LZOR encoding MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Some newer MikroTik RouterBOARD devices use a new encoding scheme for their WLAN calibration data. This patch provides support for decoding this new scheme. Signed-off-by: Thibaut VARÈNE --- .../drivers/platform/mikrotik/rb_hardconfig.c | 262 +++++++++++++++++- 1 file changed, 261 insertions(+), 1 deletion(-) diff --git a/target/linux/generic/files/drivers/platform/mikrotik/rb_hardconfig.c b/target/linux/generic/files/drivers/platform/mikrotik/rb_hardconfig.c index 0aa8cb189a..ab78037a03 100644 --- a/target/linux/generic/files/drivers/platform/mikrotik/rb_hardconfig.c +++ b/target/linux/generic/files/drivers/platform/mikrotik/rb_hardconfig.c @@ -36,7 +36,7 @@ #include "routerboot.h" -#define RB_HARDCONFIG_VER "0.01" +#define RB_HARDCONFIG_VER "0.02" #define RB_HC_PR_PFX "[rb_hardconfig] " /* ID values for hardware settings */ @@ -75,6 +75,190 @@ static struct kobject *hc_kobj; static u8 *hc_buf; // ro buffer after init(): no locking required static size_t hc_buflen; +/* + * For LZOR style WLAN data unpacking. + * This binary blob is prepended to the data encoded on some devices as + * RB_ID_WLAN_DATA, the result is then first decompressed with LZO, and then + * finally RLE-decoded. + * This binary blob has been extracted from RouterOS by + * https://forum.openwrt.org/u/ius + */ +static const u8 hc_lzor_prefix[] = { + 0x00, 0x05, 0x4c, 0x4c, 0x44, 0x00, 0x34, 0xfe, + 0xfe, 0x34, 0x11, 0x3c, 0x1e, 0x3c, 0x2e, 0x3c, + 0x4c, 0x34, 0x00, 0x52, 0x62, 0x92, 0xa2, 0xb2, + 0xc3, 0x2a, 0x14, 0x00, 0x00, 0x05, 0xfe, 0x6a, + 0x3c, 0x16, 0x32, 0x16, 0x11, 0x1e, 0x12, 0x46, + 0x32, 0x46, 0x11, 0x4e, 0x12, 0x36, 0x32, 0x36, + 0x11, 0x3e, 0x12, 0x5a, 0x9a, 0x64, 0x00, 0x04, + 0xfe, 0x10, 0x3c, 0x00, 0x01, 0x00, 0x00, 0x28, + 0x0c, 0x00, 0x0f, 0xfe, 0x14, 0x00, 0x24, 0x24, + 0x23, 0x24, 0x24, 0x23, 0x25, 0x22, 0x21, 0x21, + 0x23, 0x22, 0x21, 0x22, 0x21, 0x2d, 0x38, 0x00, + 0x0c, 0x25, 0x25, 0x24, 0x25, 0x25, 0x24, 0x23, + 0x22, 0x21, 0x20, 0x23, 0x21, 0x21, 0x22, 0x21, + 0x2d, 0x38, 0x00, 0x28, 0xb0, 0x00, 0x00, 0x22, + 0x00, 0x00, 0xc0, 0xfe, 0x03, 0x00, 0xc0, 0x00, + 0x62, 0xff, 0x62, 0xff, 0xfe, 0x06, 0x00, 0xbb, + 0xff, 0xba, 0xff, 0xfe, 0x08, 0x00, 0x9e, 0xff, + 0xfe, 0x0a, 0x00, 0x53, 0xff, 0xfe, 0x02, 0x00, + 0x20, 0xff, 0xb1, 0xfe, 0xfe, 0xb2, 0xfe, 0xfe, + 0xed, 0xfe, 0xfe, 0xfe, 0x04, 0x00, 0x3a, 0xff, + 0x3a, 0xff, 0xde, 0xfd, 0x5f, 0x04, 0x33, 0xff, + 0x4c, 0x74, 0x03, 0x05, 0x05, 0xff, 0x6d, 0xfe, + 0xfe, 0x6d, 0xfe, 0xfe, 0xaf, 0x08, 0x63, 0xff, + 0x64, 0x6f, 0x08, 0xac, 0xff, 0xbf, 0x6d, 0x08, + 0x7a, 0x6d, 0x08, 0x96, 0x74, 0x04, 0x00, 0x08, + 0x79, 0xff, 0xda, 0xfe, 0xfe, 0xdb, 0xfe, 0xfe, + 0x56, 0xff, 0xfe, 0x04, 0x00, 0x5e, 0xff, 0x5e, + 0xff, 0x6c, 0xfe, 0xfe, 0xfe, 0x06, 0x00, 0x41, + 0xff, 0x7f, 0x74, 0x03, 0x00, 0x11, 0x44, 0xff, + 0xa9, 0xfe, 0xfe, 0xa9, 0xfe, 0xfe, 0xa5, 0x8f, + 0x01, 0x00, 0x08, 0x01, 0x01, 0x02, 0x04, 0x08, + 0x02, 0x04, 0x08, 0x08, 0x01, 0x01, 0xfe, 0x22, + 0x00, 0x4c, 0x60, 0x64, 0x8c, 0x90, 0xd0, 0xd4, + 0xd8, 0x5c, 0x10, 0x09, 0xd8, 0xff, 0xb0, 0xff, + 0x00, 0x00, 0xba, 0xff, 0x14, 0x00, 0xba, 0xff, + 0x64, 0x00, 0x00, 0x08, 0xfe, 0x06, 0x00, 0x74, + 0xff, 0x42, 0xff, 0xce, 0xff, 0x60, 0xff, 0x0a, + 0x00, 0xb4, 0x00, 0xa0, 0x00, 0xa0, 0xfe, 0x07, + 0x00, 0x0a, 0x00, 0xb0, 0xff, 0x96, 0x4d, 0x00, + 0x56, 0x57, 0x18, 0xa6, 0xff, 0x92, 0x70, 0x11, + 0x00, 0x12, 0x90, 0x90, 0x76, 0x5a, 0x54, 0x54, + 0x4c, 0x46, 0x38, 0x00, 0x10, 0x10, 0x08, 0xfe, + 0x05, 0x00, 0x38, 0x29, 0x25, 0x23, 0x22, 0x22, + 0x1f, 0x00, 0x00, 0x00, 0xf6, 0xe1, 0xdd, 0xf8, + 0xfe, 0x00, 0xfe, 0x15, 0x00, 0x00, 0xd0, 0x02, + 0x74, 0x02, 0x08, 0xf8, 0xe5, 0xde, 0x02, 0x04, + 0x04, 0xfd, 0x00, 0x00, 0x00, 0x07, 0x50, 0x2d, + 0x01, 0x90, 0x90, 0x76, 0x60, 0xb0, 0x07, 0x07, + 0x0c, 0x0c, 0x04, 0xfe, 0x05, 0x00, 0x66, 0x66, + 0x5a, 0x56, 0xbc, 0x01, 0x06, 0xfc, 0xfc, 0xf1, + 0xfe, 0x07, 0x00, 0x24, 0x95, 0x70, 0x64, 0x18, + 0x06, 0x2c, 0xff, 0xb5, 0xfe, 0xfe, 0xb5, 0xfe, + 0xfe, 0xe2, 0x8c, 0x24, 0x02, 0x2f, 0xff, 0x2f, + 0xff, 0xb4, 0x78, 0x02, 0x05, 0x73, 0xff, 0xed, + 0xfe, 0xfe, 0x4f, 0xff, 0x36, 0x74, 0x1e, 0x09, + 0x4f, 0xff, 0x50, 0xff, 0xfe, 0x16, 0x00, 0x70, + 0xac, 0x70, 0x8e, 0xac, 0x40, 0x0e, 0x01, 0x70, + 0x7f, 0x8e, 0xac, 0x6c, 0x00, 0x0b, 0xfe, 0x02, + 0x00, 0xfe, 0x0a, 0x2c, 0x2a, 0x2a, 0x28, 0x26, + 0x1e, 0x1e, 0xfe, 0x02, 0x20, 0x65, 0x20, 0x00, + 0x00, 0x05, 0x12, 0x00, 0x11, 0x1e, 0x11, 0x11, + 0x41, 0x1e, 0x41, 0x11, 0x31, 0x1e, 0x31, 0x11, + 0x70, 0x75, 0x7a, 0x7f, 0x84, 0x89, 0x8e, 0x93, + 0x98, 0x30, 0x20, 0x00, 0x02, 0x00, 0xfe, 0x06, + 0x3c, 0xbc, 0x32, 0x0c, 0x00, 0x00, 0x2a, 0x12, + 0x1e, 0x12, 0x2e, 0x12, 0xcc, 0x12, 0x11, 0x1a, + 0x1e, 0x1a, 0x2e, 0x1a, 0x4c, 0x10, 0x1e, 0x10, + 0x11, 0x18, 0x1e, 0x42, 0x1e, 0x42, 0x2e, 0x42, + 0xcc, 0x42, 0x11, 0x4a, 0x1e, 0x4a, 0x2e, 0x4a, + 0x4c, 0x40, 0x1e, 0x40, 0x11, 0x48, 0x1e, 0x32, + 0x1e, 0x32, 0x2e, 0x32, 0xcc, 0x32, 0x11, 0x3a, + 0x1e, 0x3a, 0x2e, 0x3a, 0x4c, 0x30, 0x1e, 0x30, + 0x11, 0x38, 0x1e, 0x27, 0x9a, 0x01, 0x9d, 0xa2, + 0x2f, 0x28, 0x00, 0x00, 0x46, 0xde, 0xc4, 0xbf, + 0xa6, 0x9d, 0x81, 0x7b, 0x5c, 0x61, 0x40, 0xc7, + 0xc0, 0xae, 0xa9, 0x8c, 0x83, 0x6a, 0x62, 0x50, + 0x3e, 0xce, 0xc2, 0xae, 0xa3, 0x8c, 0x7b, 0x6a, + 0x5a, 0x50, 0x35, 0xd7, 0xc2, 0xb7, 0xa4, 0x95, + 0x7e, 0x72, 0x5a, 0x59, 0x37, 0xfe, 0x02, 0xf8, + 0x8c, 0x95, 0x90, 0x8f, 0x00, 0xd7, 0xc0, 0xb7, + 0xa2, 0x95, 0x7b, 0x72, 0x56, 0x59, 0x32, 0xc7, + 0xc3, 0xae, 0xad, 0x8c, 0x85, 0x6a, 0x63, 0x50, + 0x3e, 0xce, 0xc3, 0xae, 0xa4, 0x8c, 0x7c, 0x6a, + 0x59, 0x50, 0x34, 0xd7, 0xc2, 0xb7, 0xa5, 0x95, + 0x7e, 0x72, 0x59, 0x59, 0x36, 0xfc, 0x05, 0x00, + 0x02, 0xce, 0xc5, 0xae, 0xa5, 0x95, 0x83, 0x72, + 0x5c, 0x59, 0x36, 0xbf, 0xc6, 0xa5, 0xab, 0x8c, + 0x8c, 0x6a, 0x67, 0x50, 0x41, 0x64, 0x07, 0x00, + 0x02, 0x95, 0x8c, 0x72, 0x65, 0x59, 0x3f, 0xce, + 0xc7, 0xae, 0xa8, 0x95, 0x86, 0x72, 0x5f, 0x59, + 0x39, 0xfe, 0x02, 0xf8, 0x8b, 0x7c, 0x0b, 0x09, + 0xb7, 0xc2, 0x9d, 0xa4, 0x83, 0x85, 0x6a, 0x6b, + 0x50, 0x44, 0xb7, 0xc1, 0x64, 0x01, 0x00, 0x06, + 0x61, 0x5d, 0x48, 0x3d, 0xae, 0xc4, 0x9d, 0xad, + 0x7b, 0x85, 0x61, 0x66, 0x48, 0x46, 0xae, 0xc3, + 0x95, 0xa3, 0x72, 0x7c, 0x59, 0x56, 0x38, 0x31, + 0x7c, 0x0b, 0x00, 0x0c, 0x96, 0x91, 0x8f, 0x00, + 0xb7, 0xc0, 0xa5, 0xab, 0x8c, 0x8a, 0x6a, 0x64, + 0x50, 0x3c, 0xb7, 0xc0, 0x9d, 0xa0, 0x83, 0x80, + 0x6a, 0x64, 0x50, 0x3d, 0xb7, 0xc5, 0x9d, 0xa5, + 0x83, 0x87, 0x6c, 0x08, 0x07, 0xae, 0xc0, 0x9d, + 0xa8, 0x83, 0x88, 0x6a, 0x6d, 0x50, 0x46, 0xfc, + 0x05, 0x00, 0x16, 0xbf, 0xc0, 0xa5, 0xa2, 0x8c, + 0x7f, 0x6a, 0x57, 0x50, 0x2f, 0xb7, 0xc7, 0xa5, + 0xb1, 0x8c, 0x8e, 0x72, 0x6d, 0x59, 0x45, 0xbf, + 0xc6, 0xa5, 0xa8, 0x8c, 0x87, 0x6a, 0x5f, 0x50, + 0x37, 0xbf, 0xc2, 0xa5, 0xa4, 0x8c, 0x83, 0x6a, + 0x5c, 0x50, 0x34, 0xbc, 0x05, 0x00, 0x0e, 0x90, + 0x00, 0xc7, 0xc2, 0xae, 0xaa, 0x95, 0x82, 0x7b, + 0x60, 0x61, 0x3f, 0xb7, 0xc6, 0xa5, 0xb1, 0x8c, + 0x8d, 0x72, 0x6b, 0x61, 0x51, 0xbf, 0xc4, 0xa5, + 0xa5, 0x8c, 0x82, 0x72, 0x61, 0x59, 0x39, 0x6c, + 0x26, 0x03, 0x95, 0x82, 0x7b, 0x61, 0x61, 0x40, + 0xfc, 0x05, 0x00, 0x00, 0x7e, 0xd7, 0xc3, 0xb7, + 0xa8, 0x9d, 0x80, 0x83, 0x5d, 0x6a, 0x3f, 0xbf, + 0xc7, 0xa5, 0xa8, 0x8c, 0x84, 0x72, 0x60, 0x61, + 0x46, 0xbf, 0xc2, 0xae, 0xb0, 0x9d, 0x92, 0x83, + 0x6f, 0x6a, 0x50, 0xd7, 0xc3, 0xb7, 0xa7, 0x9d, + 0x80, 0x83, 0x5e, 0x6a, 0x40, 0xfe, 0x02, 0xf8, + 0x8d, 0x96, 0x90, 0x90, 0xfe, 0x05, 0x00, 0x8a, + 0xc4, 0x63, 0xb8, 0x3c, 0xa6, 0x29, 0x97, 0x16, + 0x81, 0x84, 0xb7, 0x5b, 0xa9, 0x33, 0x94, 0x1e, + 0x83, 0x11, 0x70, 0xb8, 0xc2, 0x70, 0xb1, 0x4d, + 0xa3, 0x2a, 0x8d, 0x1b, 0x7b, 0xa8, 0xbc, 0x68, + 0xab, 0x47, 0x9d, 0x27, 0x87, 0x18, 0x75, 0xae, + 0xc6, 0x7d, 0xbb, 0x4d, 0xaa, 0x1c, 0x84, 0x11, + 0x72, 0xa3, 0xbb, 0x6e, 0xad, 0x3c, 0x97, 0x24, + 0x85, 0x16, 0x71, 0x80, 0xb2, 0x57, 0xa4, 0x30, + 0x8e, 0x1c, 0x7c, 0x10, 0x68, 0xbb, 0xbd, 0x75, + 0xac, 0x4f, 0x9e, 0x2b, 0x87, 0x1a, 0x76, 0x96, + 0xc5, 0x5e, 0xb5, 0x3e, 0xa5, 0x1f, 0x8c, 0x12, + 0x7a, 0xc1, 0xc6, 0x42, 0x9f, 0x27, 0x8c, 0x16, + 0x77, 0x0f, 0x67, 0x9d, 0xbc, 0x68, 0xad, 0x36, + 0x95, 0x20, 0x83, 0x11, 0x6d, 0x9b, 0xb8, 0x67, + 0xa8, 0x34, 0x90, 0x1f, 0x7c, 0x10, 0x67, 0x9e, + 0xc9, 0x6a, 0xbb, 0x37, 0xa4, 0x20, 0x90, 0x11, + 0x7b, 0xc6, 0xc8, 0x47, 0xa4, 0x2a, 0x90, 0x18, + 0x7b, 0x10, 0x6c, 0xae, 0xc4, 0x5d, 0xad, 0x37, + 0x9a, 0x1f, 0x85, 0x13, 0x75, 0x70, 0xad, 0x42, + 0x99, 0x25, 0x84, 0x17, 0x74, 0x0b, 0x56, 0x87, + 0xc8, 0x57, 0xb8, 0x2b, 0x9e, 0x19, 0x8a, 0x0d, + 0x74, 0xa7, 0xc8, 0x6e, 0xb9, 0x36, 0xa0, 0x1f, + 0x8b, 0x11, 0x75, 0x94, 0xbe, 0x4b, 0xa5, 0x2a, + 0x92, 0x18, 0x7c, 0x0f, 0x6b, 0xaf, 0xc0, 0x58, + 0xa8, 0x34, 0x94, 0x1d, 0x7d, 0x12, 0x6d, 0x82, + 0xc0, 0x52, 0xb0, 0x25, 0x94, 0x14, 0x7f, 0x0c, + 0x68, 0x84, 0xbf, 0x3e, 0xa4, 0x22, 0x8e, 0x10, + 0x76, 0x0b, 0x65, 0x88, 0xb6, 0x42, 0x9b, 0x26, + 0x87, 0x14, 0x70, 0x0c, 0x5f, 0xc5, 0xc2, 0x3e, + 0x97, 0x23, 0x83, 0x13, 0x6c, 0x0c, 0x5c, 0xb1, + 0xc9, 0x76, 0xbc, 0x4a, 0xaa, 0x20, 0x8d, 0x12, + 0x78, 0x93, 0xbf, 0x46, 0xa3, 0x26, 0x8d, 0x14, + 0x74, 0x0c, 0x62, 0xc8, 0xc4, 0x3b, 0x97, 0x21, + 0x82, 0x11, 0x6a, 0x0a, 0x59, 0xa3, 0xb9, 0x68, + 0xa9, 0x30, 0x8d, 0x1a, 0x78, 0x0f, 0x61, 0xa0, + 0xc9, 0x73, 0xbe, 0x50, 0xb1, 0x30, 0x9f, 0x14, + 0x80, 0x83, 0xb7, 0x3c, 0x9a, 0x20, 0x84, 0x0e, + 0x6a, 0x0a, 0x57, 0xac, 0xc2, 0x68, 0xb0, 0x2e, + 0x92, 0x19, 0x7c, 0x0d, 0x63, 0x93, 0xbe, 0x62, + 0xb0, 0x3c, 0x9e, 0x1a, 0x80, 0x0e, 0x6b, 0xbb, + 0x02, 0xa0, 0x02, 0xa0, 0x02, 0x6f, 0x00, 0x75, + 0x00, 0x75, 0x00, 0x00, 0x00, 0xad, 0x02, 0xb3, + 0x02, 0x6f, 0x00, 0x87, 0x00, 0x85, 0xfe, 0x03, + 0x00, 0xc2, 0x02, 0x82, 0x4d, 0x92, 0x6e, 0x4d, + 0xb1, 0xa8, 0x84, 0x01, 0x00, 0x07, 0x7e, 0x00, + 0xa8, 0x02, 0xa4, 0x02, 0xa4, 0x02, 0xa2, 0x00, + 0xa6, 0x00, 0xa6, 0x00, 0x00, 0x00, 0xb4, 0x02, + 0xb4, 0x02, 0x92, 0x00, 0x96, 0x00, 0x96, 0x46, + 0x04, 0xb0, 0x02, 0x64, 0x02, 0x0a, 0x8c, 0x00, + 0x90, 0x02, 0x98, 0x02, 0x98, 0x02, 0x0e, 0x01, + 0x11, 0x01, 0x11, 0x50, 0xc3, 0x08, 0x88, 0x02, + 0x88, 0x02, 0x19, 0x01, 0x02, 0x01, 0x02, 0x01, + 0xf3, 0x2d, 0x00, 0x00 +}; + /* Array of known hw_options bits with human-friendly parsing */ static struct hc_hwopt { const u32 bit; @@ -287,6 +471,76 @@ fail: return ret; } +/* + * If the RB_ID_WLAN_DATA payload starts with RB_MAGIC_LZOR, then past + * that magic number is a payload that must be appended to the hc_lzor_prefix, + * the resulting blob is LZO-compressed. In the LZO decompression result, + * the RB_MAGIC_ERD magic number (aligned) must be located. Following that + * magic, there is a routerboot tag node (id 0x1) locating the RLE-encoded + * calibration data payload. + */ +static int hc_wlan_data_unpack_lzor(const u8 *inbuf, size_t inlen, + void *outbuf, size_t *outlen) +{ + u16 rle_ofs, rle_len; + size_t templen; + u8 *tempbuf; + int ret; + + templen = inlen + sizeof(hc_lzor_prefix); + if (templen > *outlen) + return -EFBIG; + + /* Temporary buffer same size as the outbuf */ + tempbuf = kmalloc(*outlen, GFP_KERNEL); + if (!outbuf) + return -ENOMEM; + + /* Concatenate into the outbuf */ + memcpy(outbuf, hc_lzor_prefix, sizeof(hc_lzor_prefix)); + memcpy(outbuf + sizeof(hc_lzor_prefix), inbuf, inlen); + + /* LZO-decompress templen bytes of outbuf into the tempbuf */ + ret = lzo1x_decompress_safe(outbuf, templen, tempbuf, outlen); + if (ret) { + pr_debug(RB_HC_PR_PFX "LZO decompression error (%d)\n", ret); + goto fail; + } + templen = *outlen; + + /* + * Post decompression we have a blob (possibly byproduct of the lzo + * dictionary). We need to find RB_MAGIC_ERD. The magic number seems to + * be 32bit-aligned in the decompression output. + */ + + while (RB_MAGIC_ERD != *(u32 *)tempbuf) { + tempbuf += 4; + templen -= 4; + } + + /* Past magic. Look for tag node */ + ret = routerboot_tag_find(tempbuf, templen, 0x1, &rle_ofs, &rle_len); + if (ret) { + pr_debug(RB_HC_PR_PFX "RLE data not found\n"); + goto fail; + } + + if (rle_len > templen) { + pr_debug(RB_HC_PR_PFX "Invalid RLE data length\n"); + goto fail; + } + + /* RLE-decode tempbuf back into the outbuf */ + ret = routerboot_rle_decode(tempbuf+rle_ofs, rle_len, outbuf, outlen); + if (ret) + pr_debug(RB_HC_PR_PFX "RLE decoding error (%d)\n", ret); + +fail: + kfree(tempbuf); + return ret; +} + static int hc_wlan_data_unpack(const size_t tofs, size_t tlen, void *outbuf, size_t *outlen) { @@ -303,6 +557,12 @@ static int hc_wlan_data_unpack(const size_t tofs, size_t tlen, ret = -ENODATA; switch (magic) { + case RB_MAGIC_LZOR: + /* Skip magic */ + lbuf += sizeof(magic); + tlen -= sizeof(magic); + ret = hc_wlan_data_unpack_lzor(lbuf, tlen, outbuf, outlen); + break; case RB_MAGIC_ERD: /* Skip magic */ lbuf += sizeof(magic);