131 lines
4.8 KiB
Bash
131 lines
4.8 KiB
Bash
#!/bin/bash
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set -euo pipefail
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# ----------------------------
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# Config
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# ----------------------------
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MIHOMO_UID="mihomo"
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REDIR_PORT="7892" # mihomo redir-port (NAT REDIRECT for TCP)
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TPROXY_PORT="7893" # mihomo tproxy-port (TPROXY for TCP/UDP)
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FW_MARK="0x1"
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ROUTE_TABLE="100"
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# Interfaces to EXCLUDE completely from interception
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EXCLUDE_IFACES=("tun0" "wg0")
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# ----------------------------
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# Helpers
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# ----------------------------
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ipt() { iptables "$@"; }
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ensure_ip_rule() {
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# Route marked traffic to local via custom table (idempotent-ish)
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ip rule list | grep -q "fwmark ${FW_MARK} lookup ${ROUTE_TABLE}" || \
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ip rule add fwmark ${FW_MARK} lookup ${ROUTE_TABLE}
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# Route everything in that table to local loopback so TPROXY can catch it
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ip route show table ${ROUTE_TABLE} | grep -q "^local 0.0.0.0/0 dev lo" || \
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ip route add local 0.0.0.0/0 dev lo table ${ROUTE_TABLE}
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}
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# ----------------------------
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# NAT (REDIRECT) part (TCP only)
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# ----------------------------
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# Cleanup old chains (ignore if absent)
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ipt -t nat -F MIHOMO_REDIR 2>/dev/null || true
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ipt -t nat -X MIHOMO_REDIR 2>/dev/null || true
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# NOTE: Your original script flushes OUTPUT table nat globally.
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# Keeping behavior to match your current approach, but yes, it nukes other rules.
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ipt -t nat -F OUTPUT 2>/dev/null || true
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# Create chain
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ipt -t nat -F MIHOMO_REDIR 2>/dev/null || true
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ipt -t nat -X MIHOMO_REDIR 2>/dev/null || true
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ipt -t nat -N MIHOMO_REDIR
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# Exclude loopback and local subnets
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ipt -t nat -A MIHOMO_REDIR -d 127.0.0.0/8 -j RETURN
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ipt -t nat -A MIHOMO_REDIR -d 10.0.0.0/8 -j RETURN
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ipt -t nat -A MIHOMO_REDIR -d 172.16.0.0/12 -j RETURN
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ipt -t nat -A MIHOMO_REDIR -d 192.168.0.0/16 -j RETURN
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# Exclude traffic that is going via tun0/wg0 (your "do not touch" tunnels)
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for IFACE in "${EXCLUDE_IFACES[@]}"; do
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ipt -t nat -A OUTPUT -o "${IFACE}" -j RETURN 2>/dev/null || true
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done
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# Exclude mihomo's own traffic by UID
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ipt -t nat -C OUTPUT -m owner --uid-owner "${MIHOMO_UID}" -j RETURN 2>/dev/null || \
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ipt -t nat -I OUTPUT -m owner --uid-owner "${MIHOMO_UID}" -j RETURN
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# Everything else TCP -> REDIRECT to mihomo
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ipt -t nat -A MIHOMO_REDIR -p tcp -j REDIRECT --to-ports "${REDIR_PORT}"
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# Apply to local OUTPUT TCP
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ipt -t nat -C OUTPUT -p tcp -j MIHOMO_REDIR 2>/dev/null || \
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ipt -t nat -A OUTPUT -p tcp -j MIHOMO_REDIR
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# Apply to traffic coming from NetBird interface (ingress)
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# Exclude tun0/wg0 by design: only target wt0 here.
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ipt -t nat -C PREROUTING -i wt0 -p tcp -j REDIRECT --to-port "${REDIR_PORT}" 2>/dev/null || \
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ipt -t nat -A PREROUTING -i wt0 -p tcp -j REDIRECT --to-port "${REDIR_PORT}"
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# IMPORTANT:
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# Removed your old rule "PREROUTING -i wg0 ... REDIRECT"
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# because you explicitly asked to exclude wg0 from routing/interception.
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# ----------------------------
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# MANGLE (TPROXY) part (TCP+UDP typically)
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# ----------------------------
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ensure_ip_rule
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# Cleanup old chains
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ipt -t mangle -F MIHOMO_TPROXY 2>/dev/null || true
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ipt -t mangle -X MIHOMO_TPROXY 2>/dev/null || true
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# Create chain
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ipt -t mangle -F MIHOMO_TPROXY 2>/dev/null || true
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ipt -t mangle -X MIHOMO_TPROXY 2>/dev/null || true
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ipt -t mangle -N MIHOMO_TPROXY
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# Exclusions: loopback/local subnets
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ipt -t mangle -A MIHOMO_TPROXY -d 127.0.0.0/8 -j RETURN
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ipt -t mangle -A MIHOMO_TPROXY -d 10.0.0.0/8 -j RETURN
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ipt -t mangle -A MIHOMO_TPROXY -d 172.16.0.0/12 -j RETURN
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ipt -t mangle -A MIHOMO_TPROXY -d 192.168.0.0/16 -j RETURN
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# Exclude traffic arriving from tun0/wg0 (ingress side)
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for IFACE in "${EXCLUDE_IFACES[@]}"; do
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ipt -t mangle -A PREROUTING -i "${IFACE}" -j RETURN 2>/dev/null || true
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done
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# Exclude traffic leaving via tun0/wg0 (local OUTPUT side)
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for IFACE in "${EXCLUDE_IFACES[@]}"; do
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ipt -t mangle -C OUTPUT -o "${IFACE}" -j RETURN 2>/dev/null || \
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ipt -t mangle -I OUTPUT -o "${IFACE}" -j RETURN
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done
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# Exclude mihomo's own traffic (OUTPUT) so it doesn't eat itself
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ipt -t mangle -C OUTPUT -m owner --uid-owner "${MIHOMO_UID}" -j RETURN 2>/dev/null || \
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ipt -t mangle -I OUTPUT -m owner --uid-owner "${MIHOMO_UID}" -j RETURN
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# --- TPROXY for local VM traffic (OUTPUT) ---
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# Mark TCP/UDP so policy routing sends them to lo (where mihomo tproxy listens)
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ipt -t mangle -C OUTPUT -p tcp -j MARK --set-mark "${FW_MARK}" 2>/dev/null || \
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ipt -t mangle -A OUTPUT -p tcp -j MARK --set-mark "${FW_MARK}"
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ipt -t mangle -C OUTPUT -p udp -j MARK --set-mark "${FW_MARK}" 2>/dev/null || \
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ipt -t mangle -A OUTPUT -p udp -j MARK --set-mark "${FW_MARK}"
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# --- TPROXY for wt0 ingress traffic (PREROUTING) ---
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# First run through our exclusions, then TPROXY it.
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ipt -t mangle -C PREROUTING -i wt0 -j MIHOMO_TPROXY 2>/dev/null || \
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ipt -t mangle -A PREROUTING -i wt0 -j MIHOMO_TPROXY
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ipt -t mangle -A MIHOMO_TPROXY -p tcp -j TPROXY --on-port "${TPROXY_PORT}" --tproxy-mark "${FW_MARK}/${FW_MARK}"
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ipt -t mangle -A MIHOMO_TPROXY -p udp -j TPROXY --on-port "${TPROXY_PORT}" --tproxy-mark "${FW_MARK}/${FW_MARK}"
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