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264 lines
8.2 KiB
264 lines
8.2 KiB
#!/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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ss_rules_usage() {
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cat >&2 <<EOF
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Usage: ss-rules [options]
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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_bypass_="
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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_src_default=bypass
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o_dst_default=bypass
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o_local_default=bypass
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__errmsg() {
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echo "ss-rules: $*" >&2
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}
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ss_rules_parse_args() {
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while [ "$#" -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 with opkg"
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return 1
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fi
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o_remote_servers="$(for s in $o_remote_servers; do resolveip -4 "$s"; 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
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for setname in $(ipset -n list | grep "ss_rules_"); do
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ipset destroy "$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_src_bypass hash:net hashsize 64
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create ss_rules_src_forward hash:net hashsize 64
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create ss_rules_src_checkdst hash:net hashsize 64
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create ss_rules_dst_bypass hash:net hashsize 64
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create ss_rules_dst_bypass_ hash:net hashsize 64
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create ss_rules_dst_forward hash:net hashsize 64
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create ss_rules_dst_forward_recentrst_ hash:ip hashsize 64 timeout 3600
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$(ss_rules_ipset_mkadd ss_rules_dst_bypass_ "$o_dst_bypass_ $o_remote_servers")
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$(ss_rules_ipset_mkadd ss_rules_src_bypass "$o_src_bypass")
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$(ss_rules_ipset_mkadd ss_rules_src_forward "$o_src_forward")
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$(ss_rules_ipset_mkadd ss_rules_src_checkdst "$o_src_checkdst")
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$(ss_rules_ipset_mkadd ss_rules_dst_bypass "$o_dst_bypass $(cat "$o_dst_bypass_file" 2>/dev/null)")
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$(ss_rules_ipset_mkadd ss_rules_dst_forward "$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 $i"
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done
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}
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ss_rules_iptchains_init() {
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ss_rules_iptchains_init_tcp
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ss_rules_iptchains_init_udp
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}
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ss_rules_iptchains_init_tcp() {
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local local_target
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[ -n "$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_dst_bypass_ dst -j RETURN
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-A ss_rules_local_out -p tcp $o_ipt_extra -j $local_target -m comment --comment "local_default: $o_local_default"
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COMMIT
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EOF
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}
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ss_rules_iptchains_init_udp() {
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[ -n "$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_dst_forward_recentrst_ dst --exist
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-A ss_rules_dst -m set --match-set ss_rules_dst_forward_recentrst_ 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_dst_bypass_ dst -j RETURN
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-A ss_rules_pre_src -p $proto $o_ipt_extra -j ss_rules_src
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-A ss_rules_src -m set --match-set ss_rules_src_bypass src -j RETURN
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-A ss_rules_src -m set --match-set ss_rules_src_forward src -j ss_rules_forward
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-A ss_rules_src -m set --match-set ss_rules_src_checkdst src -j ss_rules_dst
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-A ss_rules_src -j $src_default_target -m comment --comment "src_default: $o_src_default"
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-A ss_rules_dst -m set --match-set ss_rules_dst_bypass dst -j RETURN
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-A ss_rules_dst -m set --match-set ss_rules_dst_forward dst -j ss_rules_forward
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$recentrst_addset_rules
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-A ss_rules_dst -j $dst_default_target -m comment --comment "dst_default: $o_dst_default"
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$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
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