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65 lines
2.6 KiB
Bash
65 lines
2.6 KiB
Bash
#!/system/bin/sh
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# Write pending (memory) cached data to disk as a precaution before applying any changes.
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sync
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# resetprop (without -n) = deletes a property then modifies it, this forces property_service to update that property immediately.
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# Don't automatically insert 'dun' into the APN,
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# which would persistently tell the telecom that tethering was used.
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# At that point, only after a reboot and not getting 'dun' added again would mask it.
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resetprop -v tether_dun_required 0
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# Tethering hardware acceleration causes latency issues on the Pixel 4a (5G).
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resetprop -v tether_offload_disabled 1
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# Don't tell the telecom to check if tethering is even allowed for your data plan.
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resetprop -v net.tethering.noprovisioning true
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resetprop -v tether_entitlement_check_state 0
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# Don't apply iptables rules until Android has fully booted.
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until [ "$(getprop sys.boot_completed)" -eq 1 ] && [ -d "/sdcard" ]; do
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sleep 3
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done
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# Bypass TTL/HL detections for only Tether device (server) -> Tethered To devices (client).
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# WARNING: Routers (as the client) require their own TTL/HL increment script.
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# Tethering interfaces -> rndis0: USB, wlan1: Wi-Fi, bt-pan: Bluetooth.
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# -A: last rule in chain, -I: "head"/first rule (by default) in chain.
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for INTERFACE in "rndis0" "wlan1" "bt-pan"; do
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iptables -t mangle -A PREROUTING -i $INTERFACE -j TTL --ttl-inc 1
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iptables -t mangle -I POSTROUTING -o $INTERFACE -j TTL --ttl-inc 1
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ip6tables -t mangle -A PREROUTING ! -p icmpv6 -i $INTERFACE -j HL --hl-inc 1
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ip6tables -t mangle -I POSTROUTING ! -p icmpv6 -o $INTERFACE -j HL --hl-inc 1
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done
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# == Network optimizations ==
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# Disabling ICMP echo replies breaks PMTUD, leading to worsened packet fragmentation.
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write /proc/sys/net/ipv4/icmp_echo_ignore_all 0
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write /proc/sys/net/ipv6/icmp/echo_ignore_all 0
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# TCP acknowledgements help with lossy connections.
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write /proc/sys/net/ipv4/tcp_sack 1
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write /proc/sys/net/ipv4/tcp_dsack 1
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write /proc/sys/net/ipv4/tcp_fack 1
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# Ensure MTU is valid to prevent stuck connection(s); very useful on misconfigured networks:
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# https://blog.cloudflare.com/path-mtu-discovery-in-practice/
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write /proc/sys/net/ipv4/tcp_mtu_probing 1
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# iOS 11 forced telecoms to implement full support for TCP ECN.
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write /proc/sys/net/ipv4/tcp_ecn 1
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# Protects against wrapped TCP sequence numbers, as they cause more packet retransmissions during packet loss conditions.
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write /proc/sys/net/ipv4/tcp_timestamps 1
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# At 1: Violates TCP standards and can cause unpredictable network performance.
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write /proc/sys/net/ipv4/tcp_syncookies 0
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# Enables TCP Fast Open (RFC7413) for both requesting (client) and sending (server).
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write /proc/sys/net/ipv4/tcp_fastopen 3
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# == END ==
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exit 0
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