#!/bin/bash # Name: ipfn # Version: 1.2.4 # Date: 2026-01-22 # Description: Enhanced for VM/LXD/Docker with bridge-nf tuning and robust forwarding. if [ "$(id -u)" -ne 0 ]; then exec sudo "$0" "$@" fi TABLE_NAME="ipf_wrapper" PROTO="tcp" FORCE_FLAG=false SKIP_TEST=false QUIET_MODE=false # --- 1. Utility & Core Setup --- msg() { [[ "$QUIET_MODE" == false ]] && echo -e "$@"; } init_nft() { nft add table inet ${TABLE_NAME} 2>/dev/null # NAT Chains nft add chain inet ${TABLE_NAME} prerouting { type nat hook prerouting priority -100 \; } 2>/dev/null nft add chain inet ${TABLE_NAME} output { type nat hook output priority -100 \; } 2>/dev/null nft add chain inet ${TABLE_NAME} postrouting { type nat hook postrouting priority 100 \; } 2>/dev/null # Filter Chain (For VM/CT Forwarding) nft add chain inet ${TABLE_NAME} forward { type filter hook forward priority 0 \; policy accept \; } 2>/dev/null } enable_forwarding() { msg "Optimizing kernel parameters for VM/LXD/Docker..." sysctl -w net.ipv4.ip_forward=1 >/dev/null sysctl -w net.ipv6.conf.all.forwarding=1 >/dev/null sysctl -w net.ipv4.conf.all.route_localnet=1 >/dev/null # ブリッジパケットをNetfilterに渡す設定 (存在する場合のみ) sysctl -w net.bridge.bridge-nf-call-iptables=1 2>/dev/null sysctl -w net.bridge.bridge-nf-call-ip6tables=1 2>/dev/null msg "\e[32mForwarding and Bridge-NF enabled.\e[0m" } show_help() { echo "Usage: ipfn [OPTIONS] [RULES]" echo "" echo "Rules Format:" echo " 80:10.10.100.5:8080 Full (LocalPort:TargetIP:TargetPort)" echo " 80:8080 IP defaults to 127.0.0.1" echo " 11434 Map same port to 127.0.0.1" echo "" echo "Options:" echo " -l, -L List all rules" echo " -d HANDLE/:PORT/all Delete specific rules or '*' for all" echo " -R Reset: Clear ALL rules immediately" echo " -q Quiet mode (No output, Auto-yes)" echo " -t [HANDLE] Test connectivity" echo " -f Enable IP forward & Bridge tuning / Skip test" echo " -v Verbose (raw nftables output)" echo " -h Show this help" } list_rules() { [[ "$QUIET_MODE" == true ]] && return local highlight_uuid=$1 init_nft msg "Forwarding Rules (ipfn):" printf "%-10s %-6s %-20s %-20s %-10s\n" "HANDLE" "PROTO" "LOCAL" "TARGET" "UUID" echo "-----------------------------------------------------------------------------------" nft -a list chain inet ${TABLE_NAME} prerouting | grep "dnat" | while read -r line; do handle=$(echo "$line" | grep -o 'handle [0-9]*' | awk '{print $2}') proto=$(echo "$line" | grep -q "udp" && echo "udp" || echo "tcp") target=$(echo "$line" | grep -oE '([0-9.]+|\[[0-9a-fA-F:]+\]):[0-9]+' | head -n 1) lport=$(echo "$line" | grep -o 'dport [0-9]*' | awk '{print $2}') full_uuid=$(echo "$line" | grep -o 'ipf-id:[a-z0-9-]*' | cut -d':' -f2) if [[ -n "$highlight_uuid" && "$full_uuid" == "$highlight_uuid" ]]; then printf "\e[1;36m*%-9s %-6s %-20s %-20s %-10s\e[0m\n" "$handle" "$proto" ":$lport" "$target" "${full_uuid:0:8}" else printf "%-10s %-6s %-20s %-20s %-10s\n" "$handle" "$proto" ":$lport" "$target" "${full_uuid:0:8}" fi done } test_rule_by_port() { [[ "$QUIET_MODE" == true ]] && return local lp=$1 echo -n "Testing connectivity to :$lp... " if nc -z -v -w 2 127.0.0.1 "$lp" 2>&1 | grep -iqE "succeeded|connected|open"; then echo -e "\e[32mOK\e[0m" else echo -e "\e[31mFAILED\e[0m" fi } # --- 2. Deletion Logic --- validate_rule_handle() { nft -a list chain inet ${TABLE_NAME} prerouting | grep "handle $1" | grep -q "dnat" } all_clear() { if [[ "$FORCE_FLAG" == false ]]; then msg "\e[33mWarning: This will delete ALL forwarding rules.\e[0m" read -p "Are you sure? (y/N): " confirm [[ ! "$confirm" =~ ^[yY]$ ]] && exit 0 fi nft delete table inet ${TABLE_NAME} 2>/dev/null init_nft msg "All rules cleared successfully." exit 0 } parse_delete_targets() { local input=$1 local -a final_handles=() [[ "$input" == "*" || "$input" == "all" ]] && all_clear IFS=',' read -r -a parts <<< "$input" for part in "${parts[@]}"; do if [[ "$part" =~ ^:([0-9]+)$ ]]; then local target_port="${BASH_REMATCH[1]}" local found_h=$(nft -a list chain inet ${TABLE_NAME} prerouting | grep "dport $target_port" | grep -o 'handle [0-9]*' | awk '{print $2}') for h in $found_h; do final_handles+=("$h"); done elif [[ "$part" =~ ^([0-9]+)-([0-9]+)$ ]]; then for ((i=${BASH_REMATCH[1]}; i<=${BASH_REMATCH[2]}; i++)); do validate_rule_handle "$i" && final_handles+=("$i") done else validate_rule_handle "$part" && final_handles+=("$part") fi done echo "${final_handles[@]}" } # --- 3. Adding Logic --- add_rule() { init_nft local raw_input=$1 local lp tip tp if [[ "$raw_input" =~ ^([0-9]+):([0-9\.]+):([0-9]+)$ ]]; then lp=${BASH_REMATCH[1]}; tip=${BASH_REMATCH[2]}; tp=${BASH_REMATCH[3]} elif [[ "$raw_input" =~ ^([0-9]+):([0-9]+)$ ]]; then lp=${BASH_REMATCH[1]}; tip="127.0.0.1"; tp=${BASH_REMATCH[2]} elif [[ "$raw_input" =~ ^([0-9]+)$ ]]; then lp=${BASH_REMATCH[1]}; tip="127.0.0.1"; tp=${BASH_REMATCH[1]} else msg "\e[31mError: Invalid rule format '$raw_input'\e[0m"; exit 1 fi local raw_uuid=$(cat /proc/sys/kernel/random/uuid) local uuid="ipf-id:$raw_uuid" local family="ip"; [[ "$tip" =~ : ]] && family="ip6" # DNAT nft add rule inet ${TABLE_NAME} prerouting "$PROTO" dport "$lp" dnat $family to "$tip:$tp" comment "\"$uuid\"" nft add rule inet ${TABLE_NAME} output "$PROTO" dport "$lp" dnat $family to "$tip:$tp" comment "\"$uuid\"" # FORWARD (VM/CT対応) nft add rule inet ${TABLE_NAME} forward $family daddr "$tip" "$PROTO" dport "$tp" ct state new,established,related accept comment "\"$uuid\"" nft add rule inet ${TABLE_NAME} forward $family saddr "$tip" "$PROTO" sport "$tp" ct state established,related accept comment "\"$uuid\"" nft add rule inet ${TABLE_NAME} forward iifname "lo" accept comment "\"$uuid\"" # POSTROUTING (MASQUERADE: 戻りパケットの保証) nft add rule inet ${TABLE_NAME} postrouting $family daddr "$tip" "$PROTO" dport "$tp" masquerade comment "\"$uuid\"" list_rules "$raw_uuid" [[ "$SKIP_TEST" == false ]] && { echo ""; test_rule_by_port "$lp"; } } # --- 4. Main Parsing --- for arg in "$@"; do [[ "$arg" =~ q ]] && QUIET_MODE=true && FORCE_FLAG=true && SKIP_TEST=true [[ "$arg" =~ f ]] && FORCE_FLAG=true && SKIP_TEST=true [[ "$arg" == "-R" ]] && RESET_MODE=true done if [[ "$RESET_MODE" == true ]]; then all_clear; fi if [[ $# -eq 0 ]]; then list_rules; exit 0; fi while [[ $# -gt 0 ]]; do case "$1" in -h|--help) show_help; exit 0 ;; -v|--verbose) nft list table inet ${TABLE_NAME}; exit 0 ;; -L|-l) list_rules; exit 0 ;; -f) enable_forwarding [[ $# -eq 1 ]] && exit 0 ;; -t*) h_str="${1#-t}" if [[ -z "$h_str" && ( "$2" =~ ^[0-9,-]+$ ) ]]; then h_str="$2"; shift; fi if [[ -z "$h_str" ]]; then count=$(nft list chain inet ${TABLE_NAME} prerouting | grep -c "dnat") if [ "$count" -eq 1 ]; then h_str=$(nft -a list chain inet ${TABLE_NAME} prerouting | grep "handle" | awk '{print $NF}') else msg "Error: Multiple rules exist. Specify a handle."; exit 1 fi fi lp=$(nft -a list chain inet ${TABLE_NAME} prerouting | grep "handle $h_str" | grep -o 'dport [0-9]*' | awk '{print $2}') [[ -n "$lp" ]] && test_rule_by_port "$lp" || msg "Error: Handle $h_str not found." exit 0 ;; -*[d]*) h_str=$(echo "$1" | sed -E 's/^-q?d?f?//') [[ -z "$h_str" ]] && { h_str="$2"; shift; } handles=($(parse_delete_targets "$h_str")) [[ ${#handles[@]} -eq 0 ]] && { msg "No valid targets."; exit 1; } if [[ "$FORCE_FLAG" == false ]]; then msg "Review rules to delete (Top-level only):" for h in "${handles[@]}"; do nft -a list chain inet ${TABLE_NAME} prerouting | grep "handle $h" | sed 's/^/ /' done read -p "Delete these rules and their sub-rules? (y/N): " confirm [[ ! "$confirm" =~ ^[yY]$ ]] && exit 0 fi for h in "${handles[@]}"; do ri=$(nft -a list chain inet ${TABLE_NAME} prerouting | grep "handle $h") [[ -z "$ri" ]] && continue uuid=$(echo "$ri" | grep -o 'ipf-id:[a-z0-9-]*' | head -n 1) for c in prerouting output forward postrouting; do nft -a list chain inet ${TABLE_NAME} "$c" | grep "$uuid" | grep -o 'handle [0-9]*' | awk '{print $2}' | while read -r rh; do nft delete rule inet ${TABLE_NAME} "$c" handle "$rh" done done msg "Deleted associated with handle $h" done list_rules; exit 0 ;; *) if [[ "$1" =~ ^[0-9] ]]; then add_rule "$1"; exit 0 else msg "\e[31mError: Unknown option '$1'\e[0m\n"; show_help; exit 1 fi ;; esac shift done