disable unwanted forwarding
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garywill
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README.md
37
README.md
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@ -120,8 +120,6 @@ sudo lnxrouter -i eth1 -o isp5 --no-dns --dhcp-dns 1.1.1.1 -6 --dhcp-dns6 [26
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> 1. Stop serving local DNS
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> 2. Tell clients which DNS to use (ISP5's DNS. Or, a safe public DNS, like above example)
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> Also, read *Notice 1*
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</details>
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### Create LAN without providing Internet
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@ -136,8 +134,6 @@ sudo lnxrouter -n -i eth1
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sudo lnxrouter -n --ap wlan0 MyAccessPoint -p MyPassPhrase
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```
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> Read _Notice 1_
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</details>
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### Internet for LXC
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@ -312,17 +308,16 @@ Options:
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and to provide Internet to
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(To create WiFi hotspot use '--ap' instead)
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-o <interface> Specify an inteface to provide Internet from.
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(See Notice 1)
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(Note using this with default DNS option may leak
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queries to other interfaces)
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-n Do not provide Internet (See Notice 1)
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-n Do not provide Internet
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--ban-priv Disallow clients to access my private network
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-g <ip> This host's IPv4 address in subnet (mask is /24)
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(example: '192.168.5.1' or '5' shortly)
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-6 Enable IPv6 (NAT)
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--no4 Disable IPv4 Internet (not forwarding IPv4)
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(See Notice 1). Usually used with '-6'
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--no4 Disable IPv4 Internet (not forwarding IPv4).
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Usually used with '-6'
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--p6 <prefix> Set IPv6 LAN address prefix (length 64)
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(example: 'fd00:0:0:5::' or '5' shortly)
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@ -418,12 +413,11 @@ Options:
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--stop <id> Stop a running instance
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For <id> you can use PID or subnet interface name.
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You can get them with '--list-running'
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Notice 1: This script assume your host's default policy won't forward
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packets, so the script won't explictly ban forwarding in any
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mode. In some unexpected case (eg. mistaken configurations) may
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cause unwanted packets leakage between 2 networks, which you
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should be aware of if you want isolated network
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Examples:
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lnxrouter -i eth1
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lnxrouter --ap wlan0 MyAccessPoint -p MyPassPhrase
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lnxrouter -i eth1 --tp <transparent-proxy> --dns <dns-proxy>
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```
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</details>
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@ -455,20 +449,6 @@ Visit [**my homepage** 🏡](https://garywill.github.io) to see **more tools and
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- 🍃 Also some [unfulfilled enhancements in the Issues](https://github.com/garywill/linux-router/issues?q=is%3Aissue+is%3Aopen+label%3Aenhancement)
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- 🙋♂️ Contributions are not limited to coding. There're [some posts and questions](https://github.com/garywill/linux-router/issues) that need more people to answer
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## Notice
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<details>
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```
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Notice 1: This script assume your host's default policy won't forward
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packets, so the script won't explictly ban forwarding in any
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mode. In some unexpected case (eg. mistaken configurations) may
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cause unwanted packets leakage between 2 networks, which you
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should be aware of if you want isolated network
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```
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</details>
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## TODO
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Sooner is better:
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@ -478,7 +458,6 @@ Future:
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- WPA3
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- Global IPv6
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- Explictly ban forwarding if not needed
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- Bring bridging method back
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## License
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@ -29,17 +29,16 @@ Options:
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and to provide Internet to
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(To create WiFi hotspot use '--ap' instead)
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-o <interface> Specify an inteface to provide Internet from.
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(See Notice 1)
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(Note using this with default DNS option may leak
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queries to other interfaces)
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-n Do not provide Internet (See Notice 1)
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-n Do not provide Internet
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--ban-priv Disallow clients to access my private network
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-g <ip> This host's IPv4 address in subnet (mask is /24)
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(example: '192.168.5.1' or '5' shortly)
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-6 Enable IPv6 (NAT)
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--no4 Disable IPv4 Internet (not forwarding IPv4)
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(See Notice 1). Usually used with '-6'
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--no4 Disable IPv4 Internet (not forwarding IPv4).
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Usually used with '-6'
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--p6 <prefix> Set IPv6 LAN address prefix (length 64)
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(example: 'fd00:0:0:5::' or '5' shortly)
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@ -135,12 +134,6 @@ Options:
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--stop <id> Stop a running instance
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For <id> you can use PID or subnet interface name.
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You can get them with '--list-running'
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Notice 1: This script assume your host's default policy won't forward
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packets, so the script won't explictly ban forwarding in any
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mode. In some unexpected case (eg. mistaken configurations) may
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cause unwanted packets leakage between 2 networks, which you
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should be aware of if you want isolated network
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Examples:
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$PROGNAME -i eth1
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@ -1001,7 +994,25 @@ iptb()
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return $?
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}
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disable_unwanted_forwarding() {
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for iv in "${IP_VERs[@]}"; do
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if [[ "$INTERNET_IFACE" ]]; then
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iptb "$iv" n filter I FORWARD \
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-i "$SUBNET_IFACE" ! -o "$INTERNET_IFACE" \
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-j REJECT || die
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iptb "$iv" n filter I FORWARD \
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! -i "$INTERNET_IFACE" -o "$SUBNET_IFACE" \
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-j REJECT || die
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fi
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if [[ "$SHARE_METHOD" == 'redsocks' || "$SHARE_METHOD" == 'none' \
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|| ( "$iv" -eq "4" && "$NO4" -eq 1 ) ]];then
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iptb "$iv" n filter I FORWARD -i "$SUBNET_IFACE" -j REJECT || die
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iptb "$iv" n filter I FORWARD -o "$SUBNET_IFACE" -j REJECT || die
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fi
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done
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}
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start_nat() {
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local SUBNET_NET
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@ -1026,18 +1037,11 @@ start_nat() {
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iptb "$iv" v filter I FORWARD -i "$SUBNET_IFACE" -s "$SUBNET_NET" \
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-o $INTERNET_IFACE \
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-j ACCEPT || die
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iptb "$iv" v filter I FORWARD -i "$SUBNET_IFACE" \
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! -o $INTERNET_IFACE \
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-j REJECT || die
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# forward any -> subnet
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iptb "$iv" v filter I FORWARD -o "$SUBNET_IFACE" -d "$SUBNET_NET" \
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-i "$INTERNET_IFACE" \
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-j ACCEPT || die
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iptb "$iv" v filter I FORWARD -o "$SUBNET_IFACE" \
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! -i "$INTERNET_IFACE" \
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-j REJECT || die
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else # any interface can be Internet
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# masquerade subnet -> any(!subnet)
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iptb "$iv" v nat I POSTROUTING -s "$SUBNET_NET" ! -d "$SUBNET_NET" \
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@ -2215,27 +2219,22 @@ check_iptables
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echo "NOTICE: Not showing all operations done to iptables rules"
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[[ "$NO4" -eq 1 ]] && echo -e "\nWARN: Since you're using in this mode (no IPv4 Internet), make sure you've read Notice 1\n" >&2
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if [[ "$IPV6" -eq 0 ]]; then
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IP_VERs=("4")
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else
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IP_VERs=("4" "6")
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fi
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disable_unwanted_forwarding
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# enable Internet sharing
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if [[ "$SHARE_METHOD" == "none" ]]; then
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echo "No Internet sharing"
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echo -e "\nWARN: Since you're using in this mode (no Internet share), make sure you've read Notice 1\n" >&2
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[[ "$BANLAN" -eq 1 ]] && start_ban_lan
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elif [[ "$SHARE_METHOD" == "nat" ]]; then
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[[ "$INTERNET_IFACE" ]] && echo -e "\nWARN: Since you're using in this mode (specify Internet interface), make sure you've read Notice 1\n" >&2
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[[ "$INTERNET_IFACE" && "$dnsmasq_NO_DNS" -eq 0 ]] && echo -e "\nWARN: You specified Internet interface but this host is providing local DNS. In some unexpected case (eg. mistaken configurations), queries may leak to other interfaces, which you should be aware of.\n" >&2
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start_nat
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