typo fix

.gitignore

@@ -1,4 +1,3 @@
 build
 .directory
 .vscode
-cgproxy2.sh

cgnoproxy.sh

@@ -11,6 +11,6 @@ else
 fi
 
 # test attach success or not
-[[ -z "$attached" ]] && echo "config error" && exit 1
+[[ -z "$attached" ]] && echo "attach error" && exit 1
 
 exec "$@"

cgproxy.conf

@@ -9,19 +9,22 @@
 cgroup_proxy="/proxy.slice" 
 cgroup_noproxy="/noproxy.slice"
 
+########################################################################
+## allow as gateway for local network
+enable_gateway=false
 
 ########################################################################
 ## listening port of another proxy process, for example v2ray 
 port=12345
 
-## if you set to false, it's traffic won't go through proxy, but still can go direct to internet
+########################################################################
+## if you set to false, it's traffic won't go through proxy, but still can go direct to internet 
 enable_tcp=true
 enable_udp=true
 enable_ipv4=true
 enable_ipv6=true
 enable_dns=true
 
-
 ########################################################################
 ## do not modify this if you don't known what you are doing
 table=100

cgproxy.sh

@@ -11,6 +11,6 @@ else
 fi
 
 # test attach success or not
-[[ -z "$attached" ]] && echo "config error" && exit 1
+[[ -z "$attached" ]] && echo "attach error" && exit 1
 
 exec "$@"

cgroup-tproxy.sh

@@ -34,6 +34,9 @@ DOC
 cgroup_proxy="/proxy.slice"
 cgroup_noproxy="/noproxy.slice"
 
+# allow as gateway for local network
+enable_gateway=true
+
 ## some variables
 port=12345
 enable_tcp=true
@@ -60,6 +63,7 @@ for i in "$@"
 do
 case $i in
     stop)
+        iptables -t nat -F
         iptables -t mangle -F
         iptables -t mangle -X TPROXY_PRE
         iptables -t mangle -X TPROXY_OUT
@@ -95,16 +99,18 @@ test -d $cgroup_mount_point$cgroup_noproxy  || mkdir $cgroup_mount_point$cgroup_
 ip rule add fwmark $mark_proxy table $table
 ip route add local default dev lo table $table
 iptables -t mangle -N TPROXY_PRE
-iptables -t mangle -A TPROXY_PRE -p udp -m mark --mark $mark_proxy -j TPROXY --on-ip 127.0.0.1 --on-port $port --tproxy-mark $mark_proxy
-iptables -t mangle -A TPROXY_PRE -p tcp -m mark --mark $mark_proxy -j TPROXY --on-ip 127.0.0.1 --on-port $port --tproxy-mark $mark_proxy
-iptables -t mangle -A TPROXY_PRE -m conntrack --ctstate NEW -j CONNMARK --set-mark $make_newin
-iptables -t mangle -A TPROXY_PRE -m conntrack --ctstate NEW -j CONNMARK --restore-mark
+iptables -t mangle -A TPROXY_PRE -m addrtype --dst-type LOCAL -j RETURN
+iptables -t mangle -A TPROXY_PRE -m pkttype --pkt-type broadcast -j RETURN
+iptables -t mangle -A TPROXY_PRE -m pkttype --pkt-type multicast -j RETURN
+iptables -t mangle -A TPROXY_PRE -p tcp -j TPROXY --on-ip 127.0.0.1 --on-port $port --tproxy-mark $mark_proxy
+iptables -t mangle -A TPROXY_PRE -p udp -j TPROXY --on-ip 127.0.0.1 --on-port $port --tproxy-mark $mark_proxy
 iptables -t mangle -A PREROUTING -j TPROXY_PRE
+iptables -t mangle -A PREROUTING -m addrtype --dst-type LOCAL -m conntrack --ctstate NEW -j CONNMARK --set-mark $make_newin
 
 iptables -t mangle -N TPROXY_OUT
 iptables -t mangle -A TPROXY_OUT -o lo -j RETURN
 iptables -t mangle -A TPROXY_OUT -p icmp -j RETURN
-iptables -t mangle -A TPROXY_OUT -m connmark --mark  $make_newin -j RETURN # return incoming connection directly, v2ray tproxy not work for this situation, see this: https://github.com/Kr328/ClashForAndroid/issues/146
+iptables -t mangle -A TPROXY_OUT -m connmark --mark  $make_newin -j RETURN # return incoming connection directly
 iptables -t mangle -A TPROXY_OUT -m mark --mark $mark_noproxy -j RETURN
 iptables -t mangle -A TPROXY_OUT -m cgroup --path $cgroup_noproxy -j RETURN
 iptables -t mangle -A TPROXY_OUT -m cgroup --path $cgroup_proxy -j MARK --set-mark $mark_proxy
@@ -114,26 +120,23 @@ iptables -t mangle -A OUTPUT -j TPROXY_OUT
 ip -6 rule add fwmark $mark_proxy table $table
 ip -6 route add local default dev lo table $table
 ip6tables -t mangle -N TPROXY_PRE
-ip6tables -t mangle -A TPROXY_PRE -p udp -m mark --mark $mark_proxy -j TPROXY --on-ip ::1 --on-port $port --tproxy-mark $mark_proxy
-ip6tables -t mangle -A TPROXY_PRE -p tcp -m mark --mark $mark_proxy -j TPROXY --on-ip ::1 --on-port $port --tproxy-mark $mark_proxy
-ip6tables -t mangle -A TPROXY_PRE -m conntrack --ctstate NEW -j CONNMARK --set-mark $make_newin
-ip6tables -t mangle -A TPROXY_PRE -m conntrack --ctstate NEW -j CONNMARK --restore-mark
+ip6tables -t mangle -A TPROXY_PRE -m addrtype --dst-type LOCAL -j RETURN
+ip6tables -t mangle -A TPROXY_PRE -m pkttype --pkt-type broadcast -j RETURN
+ip6tables -t mangle -A TPROXY_PRE -m pkttype --pkt-type multicast -j RETURN
+ip6tables -t mangle -A TPROXY_PRE -p tcp -j TPROXY --on-ip ::1 --on-port $port --tproxy-mark $mark_proxy
+ip6tables -t mangle -A TPROXY_PRE -p udp -j TPROXY --on-ip ::1 --on-port $port --tproxy-mark $mark_proxy
 ip6tables -t mangle -A PREROUTING -j TPROXY_PRE
+ip6tables -t mangle -A PREROUTING -m addrtype --dst-type LOCAL -m conntrack --ctstate NEW -j CONNMARK --set-mark $make_newin
 
 ip6tables -t mangle -N TPROXY_OUT
 ip6tables -t mangle -A TPROXY_OUT -o lo -j RETURN
 ip6tables -t mangle -A TPROXY_OUT -p icmp -j RETURN
-ip6tables -t mangle -A TPROXY_OUT -m connmark --mark  $make_newin -j RETURN
+ip6tables -t mangle -A TPROXY_OUT -m connmark --mark  $make_newin -j RETURN # return incoming connection directly
 ip6tables -t mangle -A TPROXY_OUT -m mark --mark $mark_noproxy -j RETURN
 ip6tables -t mangle -A TPROXY_OUT -m cgroup --path $cgroup_noproxy -j RETURN
 ip6tables -t mangle -A TPROXY_OUT -m cgroup --path $cgroup_proxy -j MARK --set-mark $mark_proxy
 ip6tables -t mangle -A OUTPUT -j TPROXY_OUT
 
-
-## use REDIRECT
-# iptables -t nat -A OUTPUT -p tcp -m cgroup --path $cgroup_proxy -j DNAT --to-destination 127.0.0.1:12345
-# ip6tables -t nat -A OUTPUT -p tcp -m cgroup --path $cgroup_proxy -j DNAT --to-destination [::1]:12345
-
 ## allow to disable, order is important
 $enable_dns    	|| iptables  -t mangle -I TPROXY_OUT -p udp --dport 53 -j RETURN
 $enable_dns    	|| ip6tables -t mangle -I TPROXY_OUT -p udp --dport 53 -j RETURN
@@ -144,19 +147,28 @@ $enable_tcp 	|| ip6tables -t mangle -I TPROXY_OUT -p tcp -j RETURN
 $enable_ipv4 	|| iptables  -t mangle -I TPROXY_OUT -j RETURN
 $enable_ipv6 	|| ip6tables -t mangle -I TPROXY_OUT -j RETURN
 
+if $enable_gateway; then
+$enable_dns    	|| iptables  -t mangle -I TPROXY_PRE -p udp --dport 53 -j RETURN
+$enable_dns    	|| ip6tables -t mangle -I TPROXY_PRE -p udp --dport 53 -j RETURN
+$enable_udp 	|| iptables  -t mangle -I TPROXY_PRE -p udp -j RETURN
+$enable_udp 	|| ip6tables -t mangle -I TPROXY_PRE -p udp -j RETURN
+$enable_tcp 	|| iptables  -t mangle -I TPROXY_PRE -p tcp -j RETURN
+$enable_tcp 	|| ip6tables -t mangle -I TPROXY_PRE -p tcp -j RETURN
+$enable_ipv4 	|| iptables  -t mangle -I TPROXY_PRE -j RETURN
+$enable_ipv6 	|| ip6tables -t mangle -I TPROXY_PRE -j RETURN
+fi
 
-## create proxy prefix command for easy use
-# cat << 'DOC' > /usr/bin/cgproxy
-# !/usr/bin/bash
-# systemd-run -q --slice proxy.slice --scope --user $@
-# DOC
-# chmod a+x /usr/bin/cgproxy
 
 ## message for user
 cat << DOC
 proxied cgroup: $cgroup_proxy
 DOC
 
-## tproxy need Root or cap_net_admin capability
-# setcap cap_net_admin+ep /usr/lib/v2ray/v2ray
 
+if $enable_gateway; then
+    iptables  -t nat -A POSTROUTING -m addrtype ! --src-type LOCAL -j MASQUERADE
+    ip6tables -t nat -A POSTROUTING -m addrtype ! --src-type LOCAL -j MASQUERADE
+    sysctl -w net.ipv4.ip_forward=1
+    sysctl -w net.ipv6.conf.all.forwarding=1
+    echo "gateway enabled"
+fi

readme.md

@@ -6,16 +6,17 @@
 
 cgproxy will transparent proxy anything running in specific cgroup. It resembles with *proxychains* and *tsock*, but without their disadvantages, and more powerfull.
 
-It aslo supports global transparent proxy. See [Global transparent proxy](#global-transparent-proxy)
-
+It aslo supports global transparent proxy and gateway proxy. See [Global transparent proxy](#global-transparent-proxy) and  [Gateway proxy](#gateway-proxy)
 
 <!--ts-->
+
    * [Transparent Proxy with cgroup v2](#transparent-proxy-with-cgroup-v2)
       * [Introduction](#introduction)
       * [Prerequest](#prerequest)
       * [How to install](#how-to-install)
       * [How to use](#how-to-use)
       * [Global transparent proxy](#global-transparent-proxy)
+      * [Gateway proxy](#gateway-proxy)
       * [Other useful tools provided in this project](#other-useful-tools-provided-in-this-project)
       * [NOTES](#notes)
       * [TIPS](#tips)
@@ -29,14 +30,13 @@ It aslo supports global transparent proxy. See [Global transparent proxy](#globa
 
 - cgroup2
 
-  Both cgroup and cgroup2 are enable in linux by default. So you don't have to do anything about this.
+  Both cgroup and cgroup2 are enabled in linux by default. So you don't have to do anything about this.
   - `systemd-cgls` to see the cgroup hierarchical tree.
   - Why cgroup v2?  Because simple, elegant and intuitive.
 
 - TPROXY
 
   A process listening on port (e.g.  12345)  to accept iptables TPROXY, for example v2ray's dokodemo-door  in tproxy mode.
-  - Why not REDIRECT? Because REDIRECT only supports tcp and ipv4.
 
 ## How to install
 
@@ -67,9 +67,12 @@ It is alreay in [archlinux AUR](https://aur.archlinux.org/packages/cgproxy/).
   cgproxy curl -vIs https://www.google.com
   ```
 
-More config in `/etc/cgproxy.conf`:
+<details>
+  <summary>More config in `/etc/cgproxy.conf`  (click to expand)</summary>
 
 ```bash
+# see how to configure 
+# https://github.com/springzfx/cgproxy
 ########################################################################
 ## cgroup transparent proxy
 ## any process in cgroup_proxy will be proxied, and cgroup_noproxy the opposite
@@ -78,19 +81,22 @@ More config in `/etc/cgproxy.conf`:
 cgroup_proxy="/proxy.slice" 
 cgroup_noproxy="/noproxy.slice"
 
+########################################################################
+## allow as gateway for local network
+enable_gateway=false
 
 ########################################################################
 ## listening port of another proxy process, for example v2ray 
 port=12345
 
-## if you set to false, it's traffic won't go through proxy, but still can go direct to internet
+########################################################################
+## if you set to false, it's traffic won't go through proxy, but still can go direct to internet 
 enable_tcp=true
 enable_udp=true
 enable_ipv4=true
 enable_ipv6=true
 enable_dns=true
 
-
 ########################################################################
 ## do not modify this if you don't known what you are doing
 table=100
@@ -98,7 +104,7 @@ mark_proxy=0x01
 mark_noproxy=0xff
 mark_newin=0x02
 ```
-
+</details>
 If you changed config, remember to restart service
 
 ```bash
@@ -121,6 +127,11 @@ sudo systemctl restart cgproxy.service
 
 - Finally, restart service `sudo systemctl restart cgproxy.service`, that's all
 
+## Gateway proxy
+
+- set **enable_gateway=true** in `/etc/cgproxy.conf` and restart service
+- other device set this host as gateway, and set public dns if necessary
+
 ## Other useful tools provided in this project
 
 - `cgnoproxy` run program wihout proxy, very useful in global transparent proxy
@@ -149,10 +160,10 @@ sudo systemctl restart cgproxy.service
 
 - `cgattach` attach pid to specific cgroup, and has *suid* bit set by default, be careful to use on multi-user server for securiry. To avoid this situation,  you can remove the *suid* bit , then it will fallback to use *sudo*, with *visudo* you can restrict permission or set NOPASSWD for youself.
 
-- v2ray TPROXY need root or special permiassion
+- v2ray TPROXY need root or special permission
   
   ```bash
-  sudo setcap "cap_net_bind_service=+ep cap_net_admin=+ep" /usr/lib/v2ray/v2ray
+  sudo setcap "cap_net_admin,cap_net_bind_service=ep" /usr/lib/v2ray/v2ray
   ```
 
 ## TIPS