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#!/bin/sh -e |
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# |
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# Copyright (C) 2017 Yousong Zhou <yszhou4tech@gmail.com> |
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# |
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# The design idea was derived from ss-rules by Jian Chang <aa65535@live.com> |
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# |
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# This is free software, licensed under the GNU General Public License v3. |
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# See /LICENSE for more information. |
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# |
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__errmsg() { |
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echo "ss-rules: $*" >&2 |
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} |
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if [ "$1" = "-6" ]; then |
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if ! ip6tables -t nat -L -n &>/dev/null; then |
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__errmsg "Skipping ipv6. Requires ip6tables-mod-nat" |
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exit 1 |
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fi |
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o_use_ipv6=1; shift |
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fi |
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ss_rules_usage() { |
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cat >&2 <<EOF |
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Usage: ss-rules [options] |
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-6 Operate on address family IPv6 |
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When present, must be the first argument |
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-h, --help Show this help message then exit |
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-f, --flush Flush rules, ipset then exit |
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-l <port> Local port number of ss-redir with TCP mode |
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-L <port> Local port number of ss-redir with UDP mode |
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-s <ips> List of ip addresses of remote shadowsocks server |
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--ifnames Only apply rules on packets from these ifnames |
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--src-bypass <ips|cidr> |
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--src-forward <ips|cidr> |
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--src-checkdst <ips|cidr> |
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--src-default <bypass|forward|checkdst> |
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Packets will have their src ip checked in order against |
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bypass, forward, checkdst list and will bypass, forward |
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through, or continue to have their dst ip checked |
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respectively on the first match. Otherwise, --src-default |
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decide the default action |
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--dst-bypass <ips|cidr> |
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--dst-forward <ips|cidr> |
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--dst-bypass-file <file> |
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--dst-forward-file <file> |
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--dst-default <bypass|forward> |
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Same as with their --src-xx equivalent |
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--dst-forward-recentrst |
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Forward those packets whose destinations have recently |
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sent to us multiple tcp-rst packets |
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--local-default <bypass|forward|checkdst> |
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Default action for local out TCP traffic |
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The following ipsets will be created by ss-rules. They are also intended to be |
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populated by other programs like dnsmasq with ipset support |
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ss_rules_src_bypass |
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ss_rules_src_forward |
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ss_rules_src_checkdst |
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ss_rules_dst_bypass |
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ss_rules_dst_forward |
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EOF |
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} |
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o_dst_bypass4_=" |
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0.0.0.0/8 |
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10.0.0.0/8 |
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100.64.0.0/10 |
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127.0.0.0/8 |
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169.254.0.0/16 |
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172.16.0.0/12 |
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192.0.0.0/24 |
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192.0.2.0/24 |
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192.31.196.0/24 |
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192.52.193.0/24 |
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192.88.99.0/24 |
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192.168.0.0/16 |
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192.175.48.0/24 |
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198.18.0.0/15 |
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198.51.100.0/24 |
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203.0.113.0/24 |
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224.0.0.0/4 |
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240.0.0.0/4 |
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255.255.255.255 |
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" |
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o_dst_bypass6_=" |
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::1/128 |
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::/128 |
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::ffff:0:0/96 |
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64:ff9b:1::/48 |
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100::/64 |
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2001:2::/48 |
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2001:db8::/32 |
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fe80::/10 |
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2001::/23 |
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fc00::/7 |
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" |
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o_src_default=bypass |
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o_dst_default=bypass |
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o_local_default=bypass |
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alias grep_af="sed -ne '/:/!p'" |
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o_dst_bypass_="$o_dst_bypass4_" |
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if [ -n "$o_use_ipv6" ]; then |
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alias grep_af="sed -ne /:/p" |
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alias iptables=ip6tables |
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alias iptables-save=ip6tables-save |
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alias iptables-restore=ip6tables-restore |
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alias ip="ip -6" |
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o_af=6 |
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o_dst_bypass_="$o_dst_bypass6_" |
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fi |
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ss_rules_parse_args() { |
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while [ "$#" -gt 0 ]; do |
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case "$1" in |
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-h|--help) ss_rules_usage; exit 0;; |
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-f|--flush) ss_rules_flush; exit 0;; |
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-l) o_redir_tcp_port="$2"; shift 2;; |
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-L) o_redir_udp_port="$2"; shift 2;; |
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-s) o_remote_servers="$2"; shift 2;; |
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--ifnames) o_ifnames="$2"; shift 2;; |
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--ipt-extra) o_ipt_extra="$2"; shift 2;; |
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--src-default) o_src_default="$2"; shift 2;; |
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--dst-default) o_dst_default="$2"; shift 2;; |
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--local-default) o_local_default="$2"; shift 2;; |
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--src-bypass) o_src_bypass="$2"; shift 2;; |
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--src-forward) o_src_forward="$2"; shift 2;; |
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--src-checkdst) o_src_checkdst="$2"; shift 2;; |
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--dst-bypass) o_dst_bypass="$2"; shift 2;; |
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--dst-forward) o_dst_forward="$2"; shift 2;; |
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--dst-forward-recentrst) o_dst_forward_recentrst=1; shift 1;; |
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--dst-bypass-file) o_dst_bypass_file="$2"; shift 2;; |
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--dst-forward-file) o_dst_forward_file="$2"; shift 2;; |
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*) __errmsg "unknown option $1"; return 1;; |
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esac |
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done |
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if [ -z "$o_redir_tcp_port" -a -z "$o_redir_udp_port" ]; then |
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__errmsg "Requires at least -l or -L option" |
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return 1 |
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fi |
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if [ -n "$o_dst_forward_recentrst" ] && ! iptables -m recent -h >/dev/null; then |
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__errmsg "Please install iptables-mod-conntrack-extra" |
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return 1 |
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fi |
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o_remote_servers="$(for s in $o_remote_servers; do resolveip "$s" | grep_af; done)" |
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} |
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ss_rules_flush() { |
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local setname |
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iptables-save --counters | grep -v ss_rules_ | iptables-restore --counters |
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while ip rule del fwmark 1 lookup 100 2>/dev/null; do true; done |
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ip route flush table 100 2>/dev/null || true |
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for setname in $(ipset -n list | grep "ss_rules${o_af}_"); do |
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ipset destroy "$setname" 2>/dev/null || true |
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done |
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} |
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ss_rules_ipset_init() { |
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ipset --exist restore <<-EOF |
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create ss_rules${o_af}_src_bypass hash:net family inet$o_af hashsize 64 |
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create ss_rules${o_af}_src_forward hash:net family inet$o_af hashsize 64 |
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create ss_rules${o_af}_src_checkdst hash:net family inet$o_af hashsize 64 |
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create ss_rules${o_af}_dst_bypass hash:net family inet$o_af hashsize 64 |
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create ss_rules${o_af}_dst_bypass_ hash:net family inet$o_af hashsize 64 |
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create ss_rules${o_af}_dst_forward hash:net family inet$o_af hashsize 64 |
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create ss_rules${o_af}_dst_forward_rrst_ hash:ip family inet$o_af hashsize 8 timeout 3600 |
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$(ss_rules_ipset_mkadd ss_rules${o_af}_dst_bypass_ "$o_dst_bypass_ $o_remote_servers") |
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$(ss_rules_ipset_mkadd ss_rules${o_af}_src_bypass "$o_src_bypass") |
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$(ss_rules_ipset_mkadd ss_rules${o_af}_src_forward "$o_src_forward") |
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$(ss_rules_ipset_mkadd ss_rules${o_af}_src_checkdst "$o_src_checkdst") |
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$(ss_rules_ipset_mkadd ss_rules${o_af}_dst_bypass "$o_dst_bypass $(cat "$o_dst_bypass_file" 2>/dev/null)") |
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$(ss_rules_ipset_mkadd ss_rules${o_af}_dst_forward "$o_dst_forward $(cat "$o_dst_forward_file" 2>/dev/null)") |
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EOF |
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} |
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ss_rules_ipset_mkadd() { |
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local setname="$1"; shift |
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local i |
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for i in $*; do |
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echo "add $setname $i" |
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done | grep_af |
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} |
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ss_rules_iptchains_init() { |
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ss_rules_iptchains_init_tcp |
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ss_rules_iptchains_init_udp |
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} |
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ss_rules_iptchains_init_tcp() { |
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local local_target |
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[ -n "$o_redir_tcp_port" ] || return 0 |
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ss_rules_iptchains_init_ nat tcp |
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case "$o_local_default" in |
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checkdst) local_target=ss_rules_dst ;; |
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forward) local_target=ss_rules_forward ;; |
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bypass|*) return 0;; |
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esac |
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iptables-restore --noflush <<-EOF |
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*nat |
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:ss_rules_local_out - |
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-I OUTPUT 1 -p tcp -j ss_rules_local_out |
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-A ss_rules_local_out -m set --match-set ss_rules${o_af}_dst_bypass_ dst -j RETURN |
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-A ss_rules_local_out $o_ipt_extra -j $local_target |
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COMMIT |
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EOF |
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} |
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ss_rules_iptchains_init_udp() { |
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[ -n "$o_redir_udp_port" ] || return 0 |
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ss_rules_iptchains_init_ mangle udp |
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} |
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ss_rules_iptchains_init_() { |
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local table="$1" |
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local proto="$2" |
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local forward_rules |
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local src_default_target dst_default_target |
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local recentrst_mangle_rules recentrst_addset_rules |
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case "$proto" in |
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tcp) |
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forward_rules="-A ss_rules_forward -p tcp -j REDIRECT --to-ports $o_redir_tcp_port" |
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if [ -n "$o_dst_forward_recentrst" ]; then |
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recentrst_mangle_rules=" |
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*mangle |
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-I PREROUTING 1 -p tcp -m tcp --tcp-flags RST RST -m recent --name ss_rules_recentrst --set --rsource |
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COMMIT |
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" |
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recentrst_addset_rules=" |
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-A ss_rules_dst -m recent --name ss_rules_recentrst --rcheck --rdest --seconds 3 --hitcount 3 -j SET --add-set ss_rules${o_af}_dst_forward_rrst_ dst --exist |
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-A ss_rules_dst -m set --match-set ss_rules${o_af}_dst_forward_rrst_ dst -j ss_rules_forward |
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" |
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fi |
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;; |
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udp) |
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ip rule add fwmark 1 lookup 100 |
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ip route add local default dev lo table 100 |
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forward_rules="-A ss_rules_forward -p udp -j TPROXY --on-port "$o_redir_udp_port" --tproxy-mark 0x01/0x01" |
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;; |
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esac |
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case "$o_src_default" in |
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forward) src_default_target=ss_rules_forward ;; |
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checkdst) src_default_target=ss_rules_dst ;; |
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bypass|*) src_default_target=RETURN ;; |
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esac |
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case "$o_dst_default" in |
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forward) dst_default_target=ss_rules_forward ;; |
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bypass|*) dst_default_target=RETURN ;; |
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esac |
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sed -e '/^\s*$/d' -e 's/^\s\+//' <<-EOF | iptables-restore --noflush |
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*$table |
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:ss_rules_pre_src - |
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:ss_rules_src - |
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:ss_rules_dst - |
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:ss_rules_forward - |
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$(ss_rules_iptchains_mkprerules "$proto") |
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-A ss_rules_pre_src -m set --match-set ss_rules${o_af}_dst_bypass_ dst -j RETURN |
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-A ss_rules_pre_src $o_ipt_extra -j ss_rules_src |
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-A ss_rules_src -m set --match-set ss_rules${o_af}_src_bypass src -j RETURN |
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-A ss_rules_src -m set --match-set ss_rules${o_af}_src_forward src -j ss_rules_forward |
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-A ss_rules_src -m set --match-set ss_rules${o_af}_src_checkdst src -j ss_rules_dst |
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-A ss_rules_src -j $src_default_target |
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-A ss_rules_dst -m set --match-set ss_rules${o_af}_dst_bypass dst -j RETURN |
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-A ss_rules_dst -m set --match-set ss_rules${o_af}_dst_forward dst -j ss_rules_forward |
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$recentrst_addset_rules |
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-A ss_rules_dst -j $dst_default_target |
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$forward_rules |
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COMMIT |
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$recentrst_mangle_rules |
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EOF |
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} |
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ss_rules_iptchains_mkprerules() { |
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local proto="$1" |
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if [ -z "$o_ifnames" ]; then |
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echo "-I PREROUTING 1 -p $proto -j ss_rules_pre_src" |
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else |
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echo $o_ifnames \ |
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| tr ' ' '\n' \ |
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| sed "s/.*/-I PREROUTING 1 -i \\0 -p $proto -j ss_rules_pre_src/" |
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fi |
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} |
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ss_rules_parse_args "$@" |
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ss_rules_flush |
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ss_rules_ipset_init |
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ss_rules_iptchains_init |