mirror of https://github.com/aredn/aredn.git
1124 lines
46 KiB
Lua
Executable File
1124 lines
46 KiB
Lua
Executable File
--[[
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Copyright (C) 2022-2024 Tim Wilkinson
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See Contributors file for additional contributors
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation version 3 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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Additional Terms:
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Additional use restrictions exist on the AREDN® trademark and logo.
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See AREDNLicense.txt for more info.
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Attributions to the AREDN® Project must be retained in the source code.
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If importing this code into a new or existing project attribution
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to the AREDN® project must be added to the source code.
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You must not misrepresent the origin of the material contained within.
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Modified versions must be modified to attribute to the original source
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and be marked in reasonable ways as differentiate it from the original
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version
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--]]
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local ip = require("luci.ip")
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require("aredn.info")
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local socket = require("socket")
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local refresh_timeout = 15 * 60 -- refresh high cost data every 15 minutes
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local refresh_retry_timeout = 5 * 60
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local pending_timeout = 5 * 60 -- pending node wait 5 minutes before they are included
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local lastseen_timeout = 60 * 60 -- age out nodes we've not seen for 1 hour
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local snr_run_avg = 0.8 -- snr running average
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local quality_min_packets = 100 -- minimum number of tx packets before we can safely calculate the link quality
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local tx_quality_run_avg = 0.8 -- tx quality running average
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local ping_timeout = 1.0 -- timeout before ping gives a qualtiy penalty
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local ping_time_run_avg = 0.8 -- ping time runnng average
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local bitrate_run_avg = 0.8 -- rx/tx running average
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local dtd_distance = 50 -- distance (meters) after which nodes connected with DtD links are considered different sites
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local connect_timeout = 5 -- timeout (seconds) when fetching information from other nodes
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local speed_time = 10 --
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local speed_limit = 1000 -- close connection if it's too slow (< 1kB/s for 10 seconds)
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local default_short_retries = 20 -- More link-level retries helps overall tcp performance (factory default is 7)
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local default_long_retries = 20 -- (factory default is 4)
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local default_min_routes = 8 -- Minimum number of routes (nodes x2 usually) on a link which *must* be left active. Avoids cutting off poorly behaving leaf nodes.
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local wireguard_alive_time = 300 -- 5 minutes
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local NFT = "/usr/sbin/nft"
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local IW = "/usr/sbin/iw"
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local ARPING = "/usr/sbin/arping"
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local CURL = "/usr/bin/curl"
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local IPCMD = "/sbin/ip"
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local now = 0
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local config = {}
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local total_node_route_count = 0
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function update_config()
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local c = uci.cursor() -- each time as /etc/config/aredn may have changed
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config = {
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enable = c:get("aredn", "@lqm[0]", "enable") == "1",
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margin = tonumber(c:get("aredn", "@lqm[0]", "margin_snr")),
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low = tonumber(c:get("aredn", "@lqm[0]", "min_snr")),
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rts_threshold = tonumber(c:get("aredn", "@lqm[0]", "rts_threshold") or "1"),
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min_distance = tonumber(c:get("aredn", "@lqm[0]", "min_distance")),
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max_distance = tonumber(c:get("aredn", "@lqm[0]", "max_distance")),
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auto_distance = tonumber(c:get("aredn", "@lqm[0]", "auto_distance") or "0"),
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min_quality = tonumber(c:get("aredn", "@lqm[0]", "min_quality")),
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margin_quality = tonumber(c:get("aredn", "@lqm[0]", "margin_quality")),
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ping_penalty = tonumber(c:get("aredn", "@lqm[0]", "ping_penalty")),
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min_routes = tonumber(c:get("aredn", "@lqm[0]", "min_routes") or default_min_routes),
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user_blocks = c:get("aredn", "@lqm[0]", "user_blocks") or "",
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user_allows = c:get("aredn", "@lqm[0]", "user_allows") or ""
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}
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end
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-- Connected if we have tracked this link recently
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function is_connected(track)
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if track.lastseen >= now then
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return true
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else
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return false
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end
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end
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-- Pending if this link is too new
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function is_pending(track)
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if track.pending > now then
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return true
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else
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return false
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end
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end
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function is_user_blocked(track)
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if not track.user_allow and track.blocks.user then
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return true
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end
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return false
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end
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function is_leaf(track)
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return (track.leaf == "minor" and track.rev_leaf == "major") or (track.leaf == "major" and track.rev_leaf == "minor")
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end
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function should_block(track)
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if track.user_allow then
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return false
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elseif not config.enable then
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return track.blocks.user
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elseif is_pending(track) then
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return track.blocks.dtd or track.blocks.user
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elseif is_leaf(track) then
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return false
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else
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return track.blocks.dtd or track.blocks.signal or track.blocks.distance or track.blocks.user or track.blocks.dup or track.blocks.quality
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end
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end
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function should_nonpair_block(track)
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return track.blocks.dtd or track.blocks.signal or track.blocks.distance or track.blocks.user or track.blocks.quality or track.type ~= "RF"
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end
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function should_ping(track)
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if not track.ip or is_user_blocked(track) or track.lastseen < now then
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return false
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end
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if track.type == "Tunnel" or track.type == "Wireguard" then
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-- Tunnels use L3 pings, so we can only ping if we're not blocked
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if track.blocked then
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return false
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end
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else
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-- Non-tunnels use L2 pings, so we can still ping even when blocked
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-- but we dont ping if the node is too distance, the signal is too low, or we dont use this RF because
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-- we have a DTD connection instead
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if track.blocks.distance or track.blocks.signal or track.blocks.dtd then
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return false
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end
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end
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return true
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end
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function nft(cmd)
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os.execute(NFT .. " " .. cmd)
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end
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function nft_insert(chain, cmd)
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os.execute(NFT .. " insert rule ip fw4 " .. chain .. " " .. cmd)
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end
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function nft_delete(chain, handle)
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os.execute(NFT .. " delete rule ip fw4 " .. chain .. " handle " .. handle)
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end
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function nft_handle(chain, query)
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for line in io.popen(NFT .. " -a list chain ip fw4 " .. chain):lines()
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do
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local handle = line:match(query .. ".*# handle (%d+)$")
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if handle then
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return handle
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end
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end
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return nil
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end
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function update_block(track)
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if should_block(track) then
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track.blocked = true
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if track.type == "Tunnel" or track.type == "Wireguard" then
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if not nft_handle("input_lqm", "iifname \\\"" .. track.device .. "\\\" udp dport 698 drop") then
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nft_insert("input_lqm", "iifname \\\"" .. track.device .. "\\\" udp dport 698 drop 2> /dev/null")
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return "blocked"
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end
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else
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if not nft_handle("input_lqm", "udp dport 698 ether saddr " .. track.mac .. " drop") then
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nft_insert("input_lqm", "udp dport 698 ether saddr " .. track.mac .. " drop 2> /dev/null")
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return "blocked"
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end
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end
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else
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track.blocked = false
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if track.type == "Tunnel" or track.type == "Wireguard" then
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local handle = nft_handle("input_lqm", "iifname \\\"" .. track.device .. "\\\" udp dport 698 drop")
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if handle then
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nft_delete("input_lqm", handle)
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return "unblocked"
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end
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else
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local handle = nft_handle("input_lqm", "udp dport 698 ether saddr " .. track.mac .. " drop")
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if handle then
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nft_delete("input_lqm", handle)
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return "unblocked"
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end
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end
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end
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return "unchanged"
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end
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function force_remove_block(track)
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track.blocked = false
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local handle = nft_handle("input_lqm", "udp dport 698 ether saddr " .. track.mac .. " drop")
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if handle then
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nft_delete("input_lqm", handle)
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end
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handle = nft_handle("input_lqm", "iifname \\\"" .. track.device .. "\\\" udp dport 698 drop")
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if handle then
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nft_delete("input_lqm", handle)
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end
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end
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-- Distance in meters between two points
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function calc_distance(lat1, lon1, lat2, lon2)
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local r2 = 12742000 -- diameter earth (meters)
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local p = 0.017453292519943295 -- Math.PI / 180
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local v = 0.5 - math.cos((lat2 - lat1) * p) / 2 + math.cos(lat1 * p) * math.cos(lat2 * p) * (1 - math.cos((lon2 - lon1) * p)) / 2
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return math.floor(r2 * math.asin(math.sqrt(v)))
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end
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function av(c, f, n, o)
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if c and o and n then
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return f * c + (1 - f) * (n - o)
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else
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return n
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end
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end
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function round(v)
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return math.floor(v + 0.5)
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end
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-- Canonical hostname
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function canonical_hostname(hostname)
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return hostname and hostname:lower():gsub("^dtdlink%.",""):gsub("^mid%d+%.",""):gsub("^xlink%d+%.",""):gsub("%.local%.mesh$", "")
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end
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local myhostname = canonical_hostname(aredn.info.get_nvram("node") or "localnode")
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local myip = uci.cursor():get("network", "wifi", "ipaddr")
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local wgsupport = nixio.fs.stat("/usr/bin/wg")
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-- Clear old data
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local f = io.open("/tmp/lqm.info", "w")
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f:write('{"trackers":{},"hidden_nodes":[]}')
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f:close()
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-- Get radio
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local radiomode = "none"
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local wlan = aredn.hardware.get_iface_name("wifi")
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local phy = "none"
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if wlan:match("^wlan(%d+)$") then
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phy = iwinfo.nl80211.phyname(wlan)
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radiomode = "adhoc"
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end
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function iw_set(cmd)
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if phy ~= "none" then
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os.execute(IW .. " " .. phy .. " set " .. cmd .. " > /dev/null 2>&1")
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end
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end
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function lqm()
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-- Let things startup for a while before we begin
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wait_for_ticks(math.max(0, 30 - nixio.sysinfo().uptime))
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-- Create filters (cannot create during install as they disappear on reboot)
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nft("flush chain ip fw4 input_lqm 2> /dev/null")
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nft("delete chain ip fw4 input_lqm 2> /dev/null")
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nft("add chain ip fw4 input_lqm 2> /dev/null")
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local handle = nft_handle("input", "jump input_lqm comment")
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if handle then
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nft_delete("input", handle)
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end
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nft_insert("input", "jump input_lqm comment \\\"block low quality links\\\"")
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-- We dont know any distances yet
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iw_set("distance auto")
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-- Or any hidden nodes
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iw_set("rts off")
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if config.enable then
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-- Set the default retries
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iw_set("retry short " .. default_short_retries .. " long " .. default_long_retries)
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end
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-- If the channel bandwidth is less than 20, we need to adjust what we report as the values from 'iw' will not
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-- be correct
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local channel_bw_scale = 1
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local chanbw = read_all("/sys/kernel/debug/ieee80211/" .. phy .. "/ath10k/chanbw")
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if not chanbw then
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chanbw = read_all("/sys/kernel/debug/ieee80211/" .. phy .. "/ath9k/chanbw")
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end
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if chanbw then
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chanbw = tonumber(chanbw)
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if chanbw == 10 then
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channel_bw_scale = 0.5
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elseif chanbw == 5 then
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channel_bw_scale = 0.25
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end
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end
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local noise = -95
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local tracker = {}
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local dtdlinks = {}
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local rflinks = {}
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local hidden_nodes = {}
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local last_coverage = -1
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local last_short_retries = -1
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local last_long_retries = -1
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local pending_count = 0
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while true
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do
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now = nixio.sysinfo().uptime
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update_config()
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local cursor = uci.cursor()
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local cursorm = uci.cursor("/etc/config.mesh")
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local lat = cursor:get("aredn", "@location[0]", "lat")
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local lon = cursor:get("aredn", "@location[0]", "lon")
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lat = tonumber(lat)
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lon = tonumber(lon)
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local arps = {}
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for line in io.popen(IPCMD .. " neigh show"):lines()
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do
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local ip, dev, mac, probes, state = line:match("^(%S+) dev (%S+) lladdr (%S+) .+ probes (%d+) (.+)$")
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if ip and (tonumber(probes) < 4 or state ~= "STALE") then
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arps[#arps + 1] = {
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Device = dev,
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["HW address"] = mac:lower(),
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["IP address"] = ip
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}
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end
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end
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-- Find all our devices and know our macs so we can exclude them
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local devices = {}
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local our_macs = {}
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for _, i in ipairs(nixio.getifaddrs())
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do
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if i.name then
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local dev = devices[i.name]
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if not dev then
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dev = { name = i.name }
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devices[i.name] = dev
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end
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if i.family == "packet" then
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if i.addr then
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dev.mac = i.addr:lower()
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our_macs[dev.mac] = true
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end
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dev.tx_packets = i.data.tx_packets
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dev.tx_fail = i.data.tx_errors
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end
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if i.family == "inet" then
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dev.ip = i.addr
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dev.dstip = i.dstaddr
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if not dev.mac then
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-- Fake a mac from the ip if we need one
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local a, b, c, d = dev.ip:match("^(%d+)%.(%d+)%.(%d+)%.(%d+)$")
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dev.mac = string.format("00:00:%02X:%02X:%02X:%02X", a, b, c, d)
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end
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end
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end
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end
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-- Find the wireguard tunnels that are active
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local wgtuns = {}
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if wgsupport then
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local f = io.popen("/usr/bin/wg show all latest-handshakes")
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if f then
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for line in f:lines()
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do
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local iface, handshake = line:match("^(%S+)%s+%S+%s+(%d+)%s*$")
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if iface and tonumber(handshake) + wireguard_alive_time > os.time() then
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wgtuns[iface] = true
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end
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end
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f:close()
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end
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end
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local stations = {}
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-- Legacy and wireguard tunnels
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for _, dev in pairs(devices)
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do
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if dev.name:match("^tun") then
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stations[#stations + 1] = {
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type = "Tunnel",
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device = dev.name,
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ip = dev.dstip,
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mac = dev.mac,
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tx_packets = dev.tx_packets,
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tx_fail = dev.tx_fail
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}
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elseif dev.name:match("^wgc") and wgtuns[dev.name] then
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local ip123, ip4 = dev.ip:match("^(%d+%.%d+%.%d+%.)(%d+)$")
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stations[#stations + 1] = {
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type = "Wireguard",
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device = dev.name,
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ip = ip123 .. (tonumber(ip4) + 1),
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mac = dev.mac,
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tx_packets = dev.tx_packets,
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tx_fail = dev.tx_fail
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}
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elseif dev.name:match("^wgs") and wgtuns[dev.name] then
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local ip123, ip4 = dev.ip:match("^(%d+%.%d+%.%d+%.)(%d+)$")
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stations[#stations + 1] = {
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type = "Wireguard",
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device = dev.name,
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ip = ip123 .. (tonumber(ip4) - 1),
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mac = dev.mac,
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tx_packets = dev.tx_packets,
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tx_fail = dev.tx_fail
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}
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end
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end
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-- DtD
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for _, entry in ipairs(arps)
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do
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if entry.Device:match("%.2$") or entry.Device:match("^br%-dtdlink") then
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stations[#stations + 1] = {
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type = "DtD",
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device = entry.Device,
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ip = entry["IP address"],
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mac = entry["HW address"]
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}
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end
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end
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-- Xlink
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cursorm:foreach("xlink", "interface",
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function(section)
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if section.ifname then
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local entry = devices[section.ifname]
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if entry then
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stations[#stations + 1] = {
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type = "Xlink",
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device = entry.name,
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ip = entry.ip,
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mac = entry.mac
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}
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end
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end
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end
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)
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-- RF
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if radiomode == "adhoc" then
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local kv = {
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["signal avg:"] = "signal",
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["tx packets:"] = "tx_packets",
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["tx retries:"] = "tx_retries",
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["tx failed:"] = "tx_fail",
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["tx bitrate:"] = "tx_bitrate",
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["rx bitrate:"] = "rx_bitrate"
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}
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local station = {}
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local cnoise = iwinfo.nl80211.noise(wlan)
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if cnoise and cnoise < -70 then
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noise = round(noise * 0.9 + cnoise * 0.1)
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end
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for line in io.popen(IW .. " " .. wlan .. " station dump"):lines()
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do
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local mac = line:match("^Station ([0-9a-fA-F:]+) ")
|
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if mac then
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station = {
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type = "RF",
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device = wlan,
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mac = mac:lower(),
|
|
signal = 0,
|
|
noise = noise,
|
|
ip = nil,
|
|
tx_bitrate = 0,
|
|
rx_bitrate = 0
|
|
}
|
|
for _, entry in ipairs(arps)
|
|
do
|
|
if entry["HW address"] == station.mac and entry.Device:match("^wlan") then
|
|
station.ip = entry["IP address"]
|
|
break
|
|
end
|
|
end
|
|
stations[#stations + 1] = station
|
|
else
|
|
for k, v in pairs(kv)
|
|
do
|
|
local val = line:match(k .. "%s*([%d%-]+)")
|
|
if val then
|
|
station[v] = tonumber(val)
|
|
if v == "tx_bitrate" or v == "rx_bitrate" then
|
|
station[v] = station[v] * channel_bw_scale
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
-- Update the trackers based on the latest station information
|
|
for _, station in ipairs(stations)
|
|
do
|
|
if station.signal ~= 0 and not our_macs[station.mac] then
|
|
if not tracker[station.mac] then
|
|
tracker[station.mac] = {
|
|
type = station.type,
|
|
device = station.device,
|
|
firstseen = now,
|
|
lastseen = now,
|
|
pending = now + pending_timeout,
|
|
refresh = 0,
|
|
mac = station.mac,
|
|
ip = nil,
|
|
hostname = nil,
|
|
lat = nil,
|
|
lon = nil,
|
|
distance = nil,
|
|
blocks = {
|
|
dtd = false,
|
|
signal = false,
|
|
distance = false,
|
|
pair = false,
|
|
quality = false
|
|
},
|
|
blocked = false,
|
|
snr = nil,
|
|
rev_snr = nil,
|
|
avg_snr = nil,
|
|
last_tx = nil,
|
|
tx_quality = nil,
|
|
ping_quality = nil,
|
|
ping_success_time = nil,
|
|
tx_bitrate = nil,
|
|
rx_bitrate = nil,
|
|
quality = nil,
|
|
quality0_seen = nil,
|
|
quality_block_snr = nil,
|
|
last_tx_fail = nil,
|
|
last_tx_retries = nil,
|
|
avg_tx = nil,
|
|
avg_tx_retries = nil,
|
|
avg_tx_fail = nil,
|
|
node_route_count = 0,
|
|
leaf = nil,
|
|
rev_leaf = nil
|
|
}
|
|
end
|
|
local track = tracker[station.mac]
|
|
|
|
-- IP and Hostname
|
|
if station.ip and station.ip ~= track.ip then
|
|
track.ip = station.ip
|
|
track.hostname = nil
|
|
end
|
|
if not track.hostname and track.ip then
|
|
track.hostname = canonical_hostname(nixio.getnameinfo(track.ip))
|
|
end
|
|
|
|
-- Running average SNR
|
|
if station.signal and station.noise then
|
|
track.snr = round(av(track.snr, snr_run_avg, station.signal - station.noise, 0))
|
|
end
|
|
|
|
-- Running average estimate of link quality
|
|
local tx = station.tx_packets
|
|
local tx_retries = station.tx_retries
|
|
local tx_fail = station.tx_fail
|
|
|
|
if tx and track.tx and tx >= track.tx + quality_min_packets then
|
|
track.avg_tx = av(track.avg_tx, tx_quality_run_avg, tx, track.tx)
|
|
track.avg_tx_retries = av(track.avg_tx_retries, tx_quality_run_avg, tx_retries, track.tx_retries)
|
|
track.avg_tx_fail = av(track.avg_tx_fail, tx_quality_run_avg, tx_fail, track.tx_fail)
|
|
|
|
local bad = math.max((track.avg_tx_fail or 0), (track.avg_tx_retries or 0))
|
|
track.tx_quality = 100 * (1 - math.min(1, math.max(track.avg_tx > 0 and bad / track.avg_tx or 0, 0)))
|
|
end
|
|
|
|
track.tx = tx
|
|
track.tx_retries = tx_retries
|
|
track.tx_fail = tx_fail
|
|
|
|
track.tx_bitrate = av(track.tx_bitrate, bitrate_run_avg, station.tx_bitrate, track.tx_bitrate)
|
|
track.rx_bitrate = av(track.rx_bitrate, bitrate_run_avg, station.rx_bitrate, track.rx_bitrate)
|
|
|
|
track.lastseen = now
|
|
end
|
|
end
|
|
|
|
-- Update link tracking state
|
|
local ip2tracker = {}
|
|
pending_count = 0
|
|
for _, track in pairs(tracker)
|
|
do
|
|
if not track.ip then
|
|
track.routable = false
|
|
else
|
|
ip2tracker[track.ip] = track
|
|
|
|
-- Update if link is routable
|
|
local rt = ip.route(track.ip)
|
|
if rt and tostring(rt.gw) == track.ip then
|
|
track.routable = true
|
|
else
|
|
track.routable = false
|
|
end
|
|
|
|
-- Refresh remote attributes periodically as this is expensive
|
|
if now > track.refresh then
|
|
|
|
-- Refresh the hostname periodically as it can change
|
|
track.hostname = canonical_hostname(nixio.getnameinfo(track.ip)) or track.hostname
|
|
|
|
if track.blocked or not track.routable then
|
|
-- Remote is blocked not directly routable
|
|
-- We cannot update so invalidate any information considered stale and set time to attempt refresh
|
|
track.refresh = is_pending(track) and 0 or now + refresh_retry_timeout
|
|
track.rev_snr = nil
|
|
track.rev_leaf = nil
|
|
else
|
|
local raw = io.popen(CURL .. " --retry 0 --connect-timeout " .. connect_timeout .. " --speed-time " .. speed_time .. " --speed-limit " .. speed_limit .. " -s \"http://" .. track.ip .. ":8080/cgi-bin/sysinfo.json?link_info=1&lqm=1\" -o - 2> /dev/null")
|
|
local info = luci.jsonc.parse(raw:read("*a"))
|
|
raw:close()
|
|
|
|
wait_for_ticks(0)
|
|
|
|
if not info then
|
|
-- Failed to fetch information. Set time for retry and invalidate any information
|
|
-- considered stale
|
|
track.refresh = is_pending(track) and 0 or now + refresh_retry_timeout
|
|
track.rev_snr = nil
|
|
track.rev_leaf = nil
|
|
else
|
|
track.refresh = is_pending(track) and 0 or now + refresh_timeout
|
|
|
|
dtdlinks[track.mac] = {}
|
|
|
|
-- Update the distance to the remote node
|
|
track.lat = tonumber(info.lat) or track.lat
|
|
track.lon = tonumber(info.lon) or track.lon
|
|
if track.lat and track.lon and lat and lon then
|
|
track.distance = calc_distance(lat, lon, track.lat, track.lon)
|
|
end
|
|
|
|
if track.type == "RF" then
|
|
rflinks[track.mac] = nil
|
|
if info.lqm and info.lqm.enabled and info.lqm.info and info.lqm.info.trackers then
|
|
rflinks[track.mac] = {}
|
|
for _, rtrack in pairs(info.lqm.info.trackers)
|
|
do
|
|
if rtrack.type == "RF" or not rtrack.type then
|
|
local rhostname = canonical_hostname(rtrack.hostname)
|
|
if rtrack.ip and rtrack.routable then
|
|
local rdistance = nil
|
|
if tonumber(rtrack.lat) and tonumber(rtrack.lon) and lat and lon then
|
|
rdistance = calc_distance(lat, lon, tonumber(rtrack.lat), tonumber(rtrack.lon))
|
|
end
|
|
rflinks[track.mac][rtrack.ip] = {
|
|
ip = rtrack.ip,
|
|
hostname = rhostname,
|
|
distance = rdistance
|
|
}
|
|
end
|
|
if myhostname == rhostname then
|
|
track.rev_snr = (track.rev_snr and rtrack.snr) and round(snr_run_avg * track.rev_snr + (1 - snr_run_avg) * rtrack.snr) or rtrack.snr
|
|
track.rev_leaf = rtrack.leaf
|
|
end
|
|
end
|
|
end
|
|
for ip, link in pairs(info.link_info)
|
|
do
|
|
if link.hostname and link.linkType == "DTD" then
|
|
dtdlinks[track.mac][canonical_hostname(link.hostname)] = true
|
|
end
|
|
end
|
|
elseif info.link_info then
|
|
rflinks[track.mac] = {}
|
|
-- If there's no LQM information we fallback on using link information.
|
|
for ip, link in pairs(info.link_info)
|
|
do
|
|
local rhostname = canonical_hostname(link.hostname)
|
|
if link.linkType == "RF" then
|
|
rflinks[track.mac][ip] = {
|
|
ip = ip,
|
|
hostname = rhostname
|
|
}
|
|
end
|
|
if rhostname then
|
|
if link.linkType == "DTD" then
|
|
dtdlinks[track.mac][rhostname] = true
|
|
elseif link.linkType == "RF" and link.signal and link.noise and myhostname == rhostname then
|
|
local snr = link.signal - link.noise
|
|
track.rev_snr = track.rev_snr and round(snr_run_avg * track.rev_snr + (1 - snr_run_avg) * snr) or snr
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
-- Update avg snr using both ends (if we have them)
|
|
if track.snr then
|
|
if track.rev_snr then
|
|
track.avg_snr = round((track.snr + track.rev_snr) / 2)
|
|
else
|
|
track.avg_snr = track.snr
|
|
end
|
|
else
|
|
track.avg_snr = nil
|
|
end
|
|
|
|
-- Count number of pending trackers
|
|
if is_pending(track) then
|
|
pending_count = pending_count + 1
|
|
end
|
|
|
|
-- Ping addresses and penalize quality for excessively slow links
|
|
if should_ping(track) then
|
|
local success = true
|
|
local ptime
|
|
|
|
if track.type == "Tunnel" or track.type == "Wireguard" then
|
|
-- Measure the "ping" time directly to the device by sending a UDP packet
|
|
local sigsock = nixio.socket("inet", "dgram")
|
|
sigsock:setopt("socket", "rcvtimeo", ping_timeout)
|
|
sigsock:setopt("socket", "bindtodevice", track.device)
|
|
sigsock:setopt("socket", "dontroute", 1)
|
|
-- Must connect or we wont see the error
|
|
sigsock:connect(track.ip, 8080)
|
|
local pstart = socket.gettime(0)
|
|
sigsock:send("")
|
|
-- There's no actual UDP server at the other end so recv will either timeout and return 'false' if the link is slow,
|
|
-- or will error and return 'nil' if there is a node and it send back an ICMP error quickly (which for our purposes is a positive)
|
|
if sigsock:recv(0) == false then
|
|
success = false
|
|
end
|
|
ptime = socket.gettime(0) - pstart
|
|
sigsock:close()
|
|
else
|
|
-- For devices which support ARP, send an ARP request and wait for a reply. This avoids the other ends routing
|
|
-- table and firewall messing up the response packet.
|
|
local pstart = socket.gettime(0)
|
|
if os.execute(ARPING .. " -q -c 1 -D -w " .. round(ping_timeout) .. " -I " .. track.device .. " " .. track.ip) == 0 then
|
|
-- Failure
|
|
success = false
|
|
end
|
|
ptime = socket.gettime(0) - pstart
|
|
end
|
|
|
|
wait_for_ticks(0)
|
|
|
|
track.ping_quality = track.ping_quality and (track.ping_quality + 1) or 100
|
|
if success then
|
|
track.ping_success_time = track.ping_success_time and (track.ping_success_time * ping_time_run_avg + ptime * (1 - ping_time_run_avg)) or ptime
|
|
else
|
|
track.ping_quality = track.ping_quality - config.ping_penalty
|
|
end
|
|
track.ping_quality = math.max(0, math.min(100, track.ping_quality))
|
|
if not success and track.type == "DtD" and track.firstseen == now then
|
|
-- If local ping immediately fail, ditch this tracker. This can happen sometimes when we
|
|
-- find arp entries which aren't valid.
|
|
tracker[track.mac] = nil
|
|
end
|
|
else
|
|
track.ping_quality = nil
|
|
track.ping_success_time = nil
|
|
end
|
|
|
|
-- Calculate overall link quality
|
|
if track.tx_quality then
|
|
if track.ping_quality then
|
|
track.quality = round((track.tx_quality + track.ping_quality) / 2)
|
|
else
|
|
track.quality = round(track.tx_quality)
|
|
end
|
|
elseif track.ping_quality then
|
|
track.quality = round(track.ping_quality)
|
|
else
|
|
track.quality = nil
|
|
end
|
|
if track.quality and track.quality == 0 and not track.quality0_seen then
|
|
track.quality0_seen = now
|
|
end
|
|
|
|
track.node_route_count = 0
|
|
end
|
|
|
|
--
|
|
-- Pull in the routing table to see how many node routes are associated with each tracker.
|
|
--
|
|
total_node_route_count = 0
|
|
for _, route in ipairs(aredn.olsr.getOLSRRoutes())
|
|
do
|
|
-- Count routes to nodes. There are two routes to most nodes, the node's primary address
|
|
-- and the node's dtdlink address.
|
|
if route.genmask == 32 and route.destination:match("^10%.") then
|
|
local track = ip2tracker[route.gateway];
|
|
if track then
|
|
track.node_route_count = track.node_route_count + 1
|
|
total_node_route_count = total_node_route_count + 1
|
|
end
|
|
end
|
|
end
|
|
|
|
--
|
|
-- At this point we have gather all the data we need to determine which links are best to use and
|
|
-- which links should be blocked.
|
|
--
|
|
local leafs = 0
|
|
for _, track in pairs(tracker)
|
|
do
|
|
for _ = 1,1
|
|
do
|
|
-- Clear state
|
|
local oldblocks = track.blocks;
|
|
track.blocks = {
|
|
dtd = false,
|
|
signal = false,
|
|
distance = false,
|
|
pair = false,
|
|
quality = false
|
|
}
|
|
|
|
-- A leaf link is one where most (but not 0) of the nodes are on one end or the other
|
|
-- We try to keep leaf links active even if they wouldn't otherwise be, so they dont get cut off.
|
|
track.leaf = nil
|
|
if track.node_route_count > 0 then
|
|
if total_node_route_count - track.node_route_count <= config.min_routes then
|
|
track.leaf = "minor"
|
|
elseif track.node_route_count <= config.min_routes then
|
|
track.leaf = "major"
|
|
end
|
|
end
|
|
|
|
-- Always allow if user requested it
|
|
for val in string.gmatch(config.user_allows, "([^,]+)")
|
|
do
|
|
if val:gsub("%s+", ""):gsub("-", ":"):lower() == track.mac then
|
|
track.user_allow = true
|
|
break
|
|
end
|
|
end
|
|
if track.user_allow then
|
|
break
|
|
end
|
|
|
|
-- Block if user requested it
|
|
for val in string.gmatch(config.user_blocks, "([^,]+)")
|
|
do
|
|
if val:gsub("%s+", ""):gsub("-", ":"):lower() == track.mac then
|
|
track.blocks.user = true
|
|
break
|
|
end
|
|
end
|
|
if track.blocks.user then
|
|
break
|
|
end
|
|
|
|
-- SNR and distance blocks only related to RF links
|
|
if track.type == "RF" then
|
|
|
|
-- Block any nodes which are too distant
|
|
if track.distance and (track.distance < config.min_distance or track.distance > config.max_distance) then
|
|
track.blocks.distance = true
|
|
break
|
|
end
|
|
|
|
-- If we have a direct dtd connection to this device, make sure we use that
|
|
for _, dtd in pairs(tracker) do
|
|
if dtd.type == "DtD" and dtd.hostname == track.hostname then
|
|
if dtd.distance and dtd.distance < dtd_distance and dtd.routable then
|
|
track.blocks.dtd = true
|
|
end
|
|
break
|
|
end
|
|
end
|
|
if track.blocks.dtd then
|
|
break
|
|
end
|
|
|
|
-- When unblocked link signal becomes too low, block
|
|
if not oldblocks.signal then
|
|
if track.snr < config.low or (track.rev_snr and track.rev_snr < config.low) then
|
|
track.blocks.signal = true
|
|
break
|
|
end
|
|
-- when blocked link becomes (low+margin) again, dont maintain block
|
|
else
|
|
if track.snr < config.low + config.margin or (track.rev_snr and track.rev_snr < config.low + config.margin) then
|
|
track.blocks.signal = true
|
|
break
|
|
else
|
|
-- When signal is good enough to unblock a link but the quality is low, artificially bump
|
|
-- it up to give the link chance to recover
|
|
if oldblocks.quality then
|
|
track.quality = config.min_quality + config.margin_quality
|
|
track.quality0_seen = nil
|
|
end
|
|
end
|
|
end
|
|
|
|
-- If we have a quality block and the snr gets sufficiently better, bump the quality to unblock it and see if things have improved
|
|
if oldblocks.quality and track.quality_block_snr and track.avg_snr and track.avg_snr > track.quality_block_snr + config.margin then
|
|
track.quality = config.min_quality + config.margin_quality
|
|
track.quality0_seen = nil
|
|
end
|
|
end
|
|
|
|
-- Block if quality is poor
|
|
if track.quality and (track.type ~= "DtD" or (track.distance and track.distance >= dtd_distance)) then
|
|
if not oldblocks.quality then
|
|
if track.quality < config.min_quality then
|
|
track.blocks.quality = true
|
|
track.quality_block_snr = track.avg_snr
|
|
end
|
|
else
|
|
if track.quality < config.min_quality + config.margin_quality then
|
|
track.blocks.quality = true
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
-- Count block leafs
|
|
if is_leaf(track) and (track.blocks.distance or track.blocks.signal or track.blocks.quality) then
|
|
leafs = leafs + 1
|
|
end
|
|
end
|
|
|
|
-- Eliminate link pairs, where we might have links to multiple radios at the same site
|
|
-- Find them and select the one with the best SNR avg on both ends
|
|
for _, track in pairs(tracker)
|
|
do
|
|
if track.hostname and not should_nonpair_block(track) then
|
|
-- Get a list of radio pairs. These are radios we're associated with which are DTD'ed together
|
|
local tracklist = { track }
|
|
for _, track2 in pairs(tracker)
|
|
do
|
|
if track ~= track2 and track2.hostname and not should_nonpair_block(track2) then
|
|
if dtdlinks[track.mac] and dtdlinks[track.mac][track2.hostname] then
|
|
if not (track.lat and track.lon and track2.lat and track2.lon) or calc_distance(track.lat, track.lon, track2.lat, track2.lon) < dtd_distance then
|
|
tracklist[#tracklist + 1] = track2
|
|
end
|
|
end
|
|
end
|
|
end
|
|
if #tracklist == 1 then
|
|
track.blocks.dup = false
|
|
else
|
|
-- Find the link with the best average snr overall as well as unblocked
|
|
local bestany = track
|
|
local bestunblocked = nil
|
|
for _, track2 in ipairs(tracklist)
|
|
do
|
|
if track2.avg_snr > bestany.avg_snr then
|
|
bestany = track2
|
|
end
|
|
if not track2.blocks.dup and (not bestunblocked or (track2.avg_snr > bestunblocked.avg_snr)) then
|
|
bestunblocked = track2
|
|
end
|
|
end
|
|
-- A new winner if it's sufficiently better than the current
|
|
if not bestunblocked or bestany.avg_snr >= bestunblocked.avg_snr + config.margin then
|
|
bestunblocked = bestany
|
|
end
|
|
for _, track2 in ipairs(tracklist)
|
|
do
|
|
if track2 == bestunblocked then
|
|
track2.blocks.dup = false
|
|
else
|
|
track2.blocks.dup = true
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
--
|
|
-- We now have updated state on what is blocked and what is not.
|
|
-- Reflect this state with the firewall and various other
|
|
-- node parameters (e.g. rts, coverage)
|
|
--
|
|
local distance = -1
|
|
-- Update the block state and calculate the routable distance
|
|
for _, track in pairs(tracker)
|
|
do
|
|
if is_connected(track) then
|
|
if update_block(track) == "unblocked" then
|
|
-- If the link becomes unblocked, return it to pending state
|
|
track.pending = now + pending_timeout
|
|
end
|
|
|
|
if track.type == "RF" then
|
|
-- Find the most distant, unblocked, RF node
|
|
if track.distance then
|
|
if track.distance > distance and (not track.blocked or is_pending(track)) then
|
|
distance = track.distance
|
|
end
|
|
elseif is_pending(track) then
|
|
distance = config.max_distance
|
|
end
|
|
end
|
|
end
|
|
|
|
-- Remove any trackers which are too old or if they disconnect when first seen
|
|
if ((now > track.lastseen + lastseen_timeout) or
|
|
(not is_connected(track) and track.firstseen + pending_timeout > now) or
|
|
(track.quality0_seen and now > track.quality0_seen + lastseen_timeout)
|
|
) then
|
|
force_remove_block(track)
|
|
tracker[track.mac] = nil
|
|
end
|
|
end
|
|
|
|
-- Default distances if we haven't calcuated anything
|
|
if distance < 0 then
|
|
if config.auto_distance > 0 then
|
|
distance = config.auto_distance
|
|
else
|
|
distance = config.max_distance
|
|
end
|
|
end
|
|
-- Update the wifi distance
|
|
local coverage = math.min(255, math.floor((distance * 2 * 0.0033) / 3))
|
|
if config.enable and coverage ~= last_coverage then
|
|
iw_set("coverage " .. coverage)
|
|
last_coverage = coverage
|
|
end
|
|
|
|
-- Set the RTS/CTS state depending on whether everyone can see everyone
|
|
-- Build a list of all the nodes our neighbors can see
|
|
local theres = {}
|
|
for mac, rfneighbor in pairs(rflinks)
|
|
do
|
|
local track = tracker[mac]
|
|
if track and not track.blocked and track.routable then
|
|
for nip, ninfo in pairs(rfneighbor)
|
|
do
|
|
theres[nip] = ninfo
|
|
end
|
|
end
|
|
end
|
|
-- Remove all the nodes we can see from this set
|
|
for _, track in pairs(tracker)
|
|
do
|
|
if track.ip then
|
|
theres[track.ip] = nil
|
|
end
|
|
end
|
|
-- Including ourself
|
|
theres[myip] = nil
|
|
|
|
-- If there are any nodes left, then our neighbors can see hidden nodes we cant. Enable RTS/CTS
|
|
local hidden = {}
|
|
for _, ninfo in pairs(theres)
|
|
do
|
|
hidden[#hidden + 1] = ninfo
|
|
end
|
|
if config.enable and (#hidden == 0) ~= (#hidden_nodes == 0) and config.rts_threshold >= 0 and config.rts_threshold <= 2347 then
|
|
if #hidden > 0 then
|
|
iw_set("rts " .. config.rts_threshold)
|
|
else
|
|
iw_set("rts off")
|
|
end
|
|
end
|
|
hidden_nodes = hidden
|
|
|
|
-- Save this for the UI
|
|
f = io.open("/tmp/lqm.info", "w")
|
|
if f then
|
|
f:write(luci.jsonc.stringify({
|
|
now = now,
|
|
trackers = tracker,
|
|
distance = distance,
|
|
coverage = coverage,
|
|
hidden_nodes = hidden_nodes,
|
|
total_node_route_count = total_node_route_count
|
|
}, true))
|
|
f:close()
|
|
end
|
|
|
|
-- Save valid (unblocked) rf mac list for use by OLSR
|
|
if config.enable and phy ~= "none" then
|
|
if pending_count > 0 or leafs > 0 then
|
|
os.remove( "/tmp/lqm." .. phy .. ".macs")
|
|
else
|
|
local tmpfile = "/tmp/lqm." .. phy .. ".macs.tmp"
|
|
f = io.open(tmpfile, "w")
|
|
if f then
|
|
for _, track in pairs(tracker)
|
|
do
|
|
if track.device == wlan and is_connected(track) and not track.blocked then
|
|
f:write(track.mac .. "\n")
|
|
end
|
|
end
|
|
f:close()
|
|
filecopy(tmpfile, "/tmp/lqm." .. phy .. ".macs", true)
|
|
os.remove(tmpfile)
|
|
end
|
|
end
|
|
end
|
|
|
|
wait_for_ticks(60) -- 1 minute
|
|
end
|
|
end
|
|
|
|
return lqm
|