Update iptables scripts for MIHOMO integration and rename setup files

scripts/iptables-mihomo-setup.sh

@@ -0,0 +1,126 @@
+#!/bin/bash
+set -euo pipefail
+
+# ----------------------------
+# Config
+# ----------------------------
+MIHOMO_UID="mihomo"
+
+REDIR_PORT="7892"     # mihomo redir-port (NAT REDIRECT for TCP)
+TPROXY_PORT="7893"    # mihomo tproxy-port (TPROXY for TCP/UDP)
+FW_MARK="0x1"
+ROUTE_TABLE="100"
+
+# Interfaces to EXCLUDE completely from interception
+EXCLUDE_IFACES=("tun0" "wg0")
+
+# ----------------------------
+# Helpers
+# ----------------------------
+ipt() { iptables "$@"; }
+
+ensure_ip_rule() {
+  # Route marked traffic to local via custom table (idempotent-ish)
+  ip rule list | grep -q "fwmark ${FW_MARK} lookup ${ROUTE_TABLE}" || \
+    ip rule add fwmark ${FW_MARK} lookup ${ROUTE_TABLE}
+
+  # Route everything in that table to local loopback so TPROXY can catch it
+  ip route show table ${ROUTE_TABLE} | grep -q "^local 0.0.0.0/0 dev lo" || \
+    ip route add local 0.0.0.0/0 dev lo table ${ROUTE_TABLE}
+}
+
+# ----------------------------
+# NAT (REDIRECT) part (TCP only)
+# ----------------------------
+
+# Cleanup old chains (ignore if absent)
+ipt -t nat -F MIHOMO_REDIR 2>/dev/null || true
+ipt -t nat -X MIHOMO_REDIR 2>/dev/null || true
+
+# NOTE: Your original script flushes OUTPUT table nat globally.
+# Keeping behavior to match your current approach, but yes, it nukes other rules.
+ipt -t nat -F OUTPUT 2>/dev/null || true
+
+# Create chain
+ipt -t nat -N MIHOMO_REDIR
+
+# Exclude loopback and local subnets
+ipt -t nat -A MIHOMO_REDIR -d 127.0.0.0/8 -j RETURN
+ipt -t nat -A MIHOMO_REDIR -d 10.0.0.0/8 -j RETURN
+ipt -t nat -A MIHOMO_REDIR -d 172.16.0.0/12 -j RETURN
+ipt -t nat -A MIHOMO_REDIR -d 192.168.0.0/16 -j RETURN
+
+# Exclude traffic that is going via tun0/wg0 (your "do not touch" tunnels)
+for IFACE in "${EXCLUDE_IFACES[@]}"; do
+  ipt -t nat -A OUTPUT -o "${IFACE}" -j RETURN 2>/dev/null || true
+done
+
+# Exclude mihomo's own traffic by UID
+ipt -t nat -C OUTPUT -m owner --uid-owner "${MIHOMO_UID}" -j RETURN 2>/dev/null || \
+ipt -t nat -I OUTPUT -m owner --uid-owner "${MIHOMO_UID}" -j RETURN
+
+# Everything else TCP -> REDIRECT to mihomo
+ipt -t nat -A MIHOMO_REDIR -p tcp -j REDIRECT --to-ports "${REDIR_PORT}"
+
+# Apply to local OUTPUT TCP
+ipt -t nat -C OUTPUT -p tcp -j MIHOMO_REDIR 2>/dev/null || \
+ipt -t nat -A OUTPUT -p tcp -j MIHOMO_REDIR
+
+# Apply to traffic coming from NetBird interface (ingress)
+# Exclude tun0/wg0 by design: only target wt0 here.
+ipt -t nat -C PREROUTING -i wt0 -p tcp -j REDIRECT --to-port "${REDIR_PORT}" 2>/dev/null || \
+ipt -t nat -A PREROUTING -i wt0 -p tcp -j REDIRECT --to-port "${REDIR_PORT}"
+
+# IMPORTANT:
+# Removed your old rule "PREROUTING -i wg0 ... REDIRECT"
+# because you explicitly asked to exclude wg0 from routing/interception.
+
+# ----------------------------
+# MANGLE (TPROXY) part (TCP+UDP typically)
+# ----------------------------
+
+ensure_ip_rule
+
+# Cleanup old chains
+ipt -t mangle -F MIHOMO_TPROXY 2>/dev/null || true
+ipt -t mangle -X MIHOMO_TPROXY 2>/dev/null || true
+
+# Create chain
+ipt -t mangle -N MIHOMO_TPROXY
+
+# Exclusions: loopback/local subnets
+ipt -t mangle -A MIHOMO_TPROXY -d 127.0.0.0/8 -j RETURN
+ipt -t mangle -A MIHOMO_TPROXY -d 10.0.0.0/8 -j RETURN
+ipt -t mangle -A MIHOMO_TPROXY -d 172.16.0.0/12 -j RETURN
+ipt -t mangle -A MIHOMO_TPROXY -d 192.168.0.0/16 -j RETURN
+
+# Exclude traffic arriving from tun0/wg0 (ingress side)
+for IFACE in "${EXCLUDE_IFACES[@]}"; do
+  ipt -t mangle -A PREROUTING -i "${IFACE}" -j RETURN 2>/dev/null || true
+done
+
+# Exclude traffic leaving via tun0/wg0 (local OUTPUT side)
+for IFACE in "${EXCLUDE_IFACES[@]}"; do
+  ipt -t mangle -C OUTPUT -o "${IFACE}" -j RETURN 2>/dev/null || \
+  ipt -t mangle -I OUTPUT -o "${IFACE}" -j RETURN
+done
+
+# Exclude mihomo's own traffic (OUTPUT) so it doesn't eat itself
+ipt -t mangle -C OUTPUT -m owner --uid-owner "${MIHOMO_UID}" -j RETURN 2>/dev/null || \
+ipt -t mangle -I OUTPUT -m owner --uid-owner "${MIHOMO_UID}" -j RETURN
+
+# --- TPROXY for local VM traffic (OUTPUT) ---
+# Mark TCP/UDP so policy routing sends them to lo (where mihomo tproxy listens)
+ipt -t mangle -C OUTPUT -p tcp -j MARK --set-mark "${FW_MARK}" 2>/dev/null || \
+ipt -t mangle -A OUTPUT -p tcp -j MARK --set-mark "${FW_MARK}"
+
+ipt -t mangle -C OUTPUT -p udp -j MARK --set-mark "${FW_MARK}" 2>/dev/null || \
+ipt -t mangle -A OUTPUT -p udp -j MARK --set-mark "${FW_MARK}"
+
+# --- TPROXY for wt0 ingress traffic (PREROUTING) ---
+# First run through our exclusions, then TPROXY it.
+ipt -t mangle -C PREROUTING -i wt0 -j MIHOMO_TPROXY 2>/dev/null || \
+ipt -t mangle -A PREROUTING -i wt0 -j MIHOMO_TPROXY
+
+ipt -t mangle -A MIHOMO_TPROXY -p tcp -j TPROXY --on-port "${TPROXY_PORT}" --tproxy-mark "${FW_MARK}/${FW_MARK}"
+ipt -t mangle -A MIHOMO_TPROXY -p udp -j TPROXY --on-port "${TPROXY_PORT}" --tproxy-mark "${FW_MARK}/${FW_MARK}"