LZ77 in mikrotik

johnth · June 24, 2023, 12:51am

test PR for lz77 decompress here. Very WIP.

github.com/john-tho/openwrt

[WIP][RFT] generic: platform/mikrotik: add wlan lz77 decompress

john-tho:master ← john-tho:mikrotik_wlan_lz77

opened 12:03AM - 24 Jun 23 UTC

john-tho

+512 -1

usual disclaimer: expect your device to halt and catch fire… very rough attem…pt to decode lz77; rough, excessively verbose, and entirely unoptimised. A number of new (or newly factory flashed) 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 determined via [5]. [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

see also: Mikrotik RouterOS v7.x and OpenWrt sysupgrade - #60 by johnth