is_same_netns: handle if not same pidns

* add options for wifi66

* rebase to 0.7.6 and upgrade version to 0.8.0-unstable0

* fix channel detection

* can_transmit_to_channel: fix 5GHz and 6GHz freq range

* can_transmit_to_channel: limit freq integer part to 4 digits

* enable wmm when wifi 6 is enabled

* lint remove stray spaces

* Revert "lint remove stray spaces"

This reverts commit 8830b95cffc460cb19769630581e029c2be56f05.

---------

Co-authored-by: garywill <garywill@disroot.org>
Co-authored-by: Phani Pavan K <kphanipavan+goose@gmail.com>

NOTICE

@@ -1,42 +0,0 @@
-Copyright (c) 2013, oblique
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-* Redistributions of source code must retain the above copyright notice, this
-  list of conditions and the following disclaimer.
-
-* Redistributions in binary form must reproduce the above copyright notice,
-  this list of conditions and the following disclaimer in the documentation
-  and/or other materials provided with the distribution.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
-FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-================================================================================
-
-linux-router
-Copyright (C) 2018  garywill
-
-This library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Lesser General Public
-License as published by the Free Software Foundation; either
-version 2.1 of the License, or (at your option) any later version.
-
-This library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-Lesser General Public License for more details.
-
-You should have received a copy of the GNU Lesser General Public
-License along with this library; if not, write to the Free Software
-Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

README.md

@@ -1,10 +1,10 @@
 # Linux-router
 
-Set Linux as router in one command. Able to Provide Internet, or create Wifi hotspot. Support transparent proxy (redsocks). Also useful for routing VM/containers.
+Set Linux as router in one command. Able to provide Internet, or create WiFi hotspot. Support transparent proxy (redsocks). Also useful for routing VM/containers.
 
 It wraps `iptables`, `dnsmasq` etc. stuff. Use in one command, restore in one command or by `control-c` (or even by closing terminal window).
 
-[Buy me a coffee](https://github.com/garywill/receiving/blob/master/receiving_methods.md)
+[Linux-Router News & Developer Notes 📰](https://github.com/garywill/linux-router/issues/28) | [More tools and projects 🛠️](https://garywill.github.io) | [🍻 Buy me a coffee ❤️](https://github.com/garywill/receiving/blob/master/receiving_methods.md)
 
 
 ## Features
@@ -13,16 +13,20 @@ Basic features:
 
 - Create a NATed sub-network
 - Provide Internet
-- DHCP server and RA
-- DNS server 
+- DHCP server (and RA)
+  - Specify what DNS the DHCP server assigns to clients
+- DNS server
+  - Specify upstream DNS (kind of a plain DNS proxy)
 - IPv6 (behind NATed LAN, like IPv4)
-- Creating Wifi hotspot:
+- Creating WiFi hotspot:
   - Channel selecting
   - Choose encryptions: WPA2/WPA, WPA2, WPA, No encryption
-  - Create AP on the same interface you are getting Internet (require same channel)
+  - Create AP on the same interface you are getting Internet (usually require same channel)
 - Transparent proxy (redsocks)
-- DNS proxy
-- Compatible with NetworkManager (automatically set interface as unmanaged)
+- Transparent DNS proxy (hijack port 53 packets)
+- Detect NetworkManager and make sure it won't interfere (handle interface (un)managed status)
+- Detect firewalld and make sure it won't interfere our (by using `trusted` zone)
+- You can run many instances, to create many different networks. Has instances managing feature.
 
 **For many other features, see below [CLI usage](#cli-usage-and-other-features)**
 
@@ -36,7 +40,7 @@ Internet----(eth0/wlan0)-Linux-(wlanX)AP
 
 ```
                                     Internet
-Wifi AP(no DHCP)                        |
+WiFi AP(no DHCP)                        |
     |----(wlan1)-Linux-(eth0/wlan0)------
     |           (DHCP)
     |--client
@@ -59,42 +63,87 @@ Internet----(eth0/wlan0)-Linux-(eth1)------Another PC
 Internet----(eth0/wlan0)-Linux-(virtual interface)-----VM/container
 ```
 
+## Install
+
+1-file-script. Release on [Linux-router repo on Github](https://github.com/garywill/linux-router). Just download and run the bash script (meet the dependencies). In this case use without installation.
+
+I'm currently not packaging for any distro. If you do, open a PR and add the link (can be with a version badge) to list here
+
+| Linux distro |                                                                                                            |
+| ------------ | ---------------------------------------------------------------------------------------------------------- |
+| Any          | download [1-file-script](https://raw.githubusercontent.com/garywill/linux-router/master/lnxrouter) and run without installation |
+
+### Dependencies
+
+- bash
+- procps or procps-ng
+- iproute2
+- dnsmasq
+- iptables (or nftables with `iptables-nft` translation linked)
+- WiFi hotspot dependencies
+  - hostapd
+  - iw (or iwconfig, when iw can not recognize adapter)
+  - haveged (optional)
+  - crda and wireless-regdb (optional)
+
+
+
 ## Usage
 
 ### Provide Internet to an interface
 
-```
+```bash
 sudo lnxrouter -i eth1
 ```
 
-### Provide an interface's Internet to another interface
+no matter which interface (other than `eth1`) you're getting Internet from.
 
-```
-sudo lnxrouter -i eth1 -o vpn0 --dhcp-dns 1.1.1.1 -6 --dhcp-dns6 [2606:4700:4700::1111]
-```
-> Read _Notice 1_
+### Create WiFi hotspot
 
-### Create Wifi hotspot
-
-```
+```bash
 sudo lnxrouter --ap wlan0 MyAccessPoint -p MyPassPhrase
 ```
 
-### LAN without Internet
+no matter which interface you're getting Internet from (even from `wlan0`). Will create virtual Interface `x0wlan0` for hotspot.
 
+### Provide an interface's Internet to another interface
+
+Clients access Internet through only `isp5`
+
+<details>
+
+```bash
+sudo lnxrouter -i eth1 -o isp5  --no-dns  --dhcp-dns 1.1.1.1  -6 --dhcp-dns6 [2606:4700:4700::1111]
 ```
+
+> In this case of usage, it's recommended to:
+> 
+> 1. Stop serving local DNS
+> 2. Tell clients which DNS to use (ISP5's DNS. Or, a safe public DNS, like above example)
+
+</details>
+
+### Create LAN without providing Internet
+
+<details>
+
+```bash
 sudo lnxrouter -n -i eth1
+```
+
+```bash
 sudo lnxrouter -n --ap wlan0 MyAccessPoint -p MyPassPhrase
 ```
 
-> Read _Notice 1_
-
+</details>
 
 ### Internet for LXC
 
+<details>
+
 Create a bridge
 
-```
+```bash
 sudo brctl addbr lxcbr5
 ```
 
@@ -107,16 +156,20 @@ lxc.network.link = lxcbr5
 lxc.network.hwaddr = xx:xx:xx:xx:xx:xx
 ```
 
-```
+```bash
 sudo lnxrouter -i lxcbr5
 ```
 
-### Transparent proxy 
+</details>
 
-For example through Tor
+### Transparent proxy
 
-```
-sudo lnxrouter -i eth1 --tp 9040 --dns 9053 -g 192.168.55.1 --p6 fd00:5:6:7::
+All clients' Internet traffic go through, for example, Tor (notice this example is NOT an anonymity use)
+
+<details>
+
+```bash
+sudo lnxrouter -i eth1 --tp 9040 --dns 9053 -g 192.168.55.1 -6 --p6 fd00:5:6:7::
 ```
 
 In `torrc`
@@ -128,11 +181,19 @@ TransPort [fd00:5:6:7::1]:9040
 DNSPort [fd00:5:6:7::1]:9053
 ```
 
+> **Warn**: Tor's anonymity relies on a purpose-made browser. Using Tor like this (sharing Tor's network to LAN clients) will NOT ensure anonymity.
+> 
+> Although we use Tor as example here, Linux-router does NOT ensure nor is NOT aiming at anonymity.
+
+</details>
+
 ### Clients-in-sandbox network
 
 To not give our infomation to clients. Clients can still access Internet.
 
-```
+<details>
+
+```bash
 sudo lnxrouter -i eth1 \
     --tp 9040 --dns 9053 \
     --random-mac \
@@ -140,20 +201,23 @@ sudo lnxrouter -i eth1 \
     --catch-dns --log-dns   # optional
 ```
 
-> This script comes with no warrenty, use on your own risk
+</details>
 
+> Linux-router comes with no warranty. Use on your own risk
 
 ### Use as transparent proxy for LXD
 
+<details>
+
 Create a bridge
 
-```
+```bash
 sudo brctl addbr lxdbr5
 ```
 
 Create and add a new LXD profile overriding container's `eth0`
 
-```
+```bash
 lxc profile create profile5
 lxc profile edit profile5
 
@@ -171,13 +235,13 @@ name: profile5
 lxc profile add <container> profile5
 ```
 
-```
+```bash
 sudo lnxrouter -i lxdbr5 --tp 9040 --dns 9053
 ```
 
 To remove that new profile from container
 
-```
+```bash
 lxc profile remove <container> profile5
 ```
 
@@ -185,39 +249,55 @@ lxc profile remove <container> profile5
 
 Add new `eth0` to container overriding default `eth0`
 
-```
+```bash
 lxc config device add <container> eth0 nic name=eth0 nictype=bridged parent=lxdbr5
 ```
 
 To remove the customized `eth0` to restore default `eth0`
 
-```
+```bash
 lxc config device remove <container> eth0
 ```
 
+</details>
+
 ### Use as transparent proxy for VirtualBox
 
+<details>
+
 In VirtualBox's global settings, create a host-only network `vboxnet5` with DHCP disabled.
 
-```
+```bash
 sudo lnxrouter -i vboxnet5 --tp 9040 --dns 9053
 ```
 
+</details>
+
 ### Use as transparent proxy for firejail
 
+<details>
+
 Create a bridge
 
-```
+```bash
 sudo brctl addbr firejail5
 ```
 
-```
+```bash
 sudo lnxrouter -i firejail5 -g 192.168.55.1 --tp 9040 --dns 9053 
 firejail --net=firejail5 --dns=192.168.55.1 --blacklist=/var/run/nscd
 ```
 
+Firejail's `/etc/resolv.conf` doesn't obtain DNS from DHCP, so we need to assign.
+
+nscd is domain name cache service, which shouldn't be accessed from in jail here.
+
+</details>
+
 ### CLI usage and other features
 
+<details>
+
 ```
 Usage: lnxrouter <options>
 
@@ -227,18 +307,18 @@ Options:
 
     -i <interface>          Interface to make NATed sub-network,
                             and to provide Internet to
-                            (To create Wifi hotspot use '--ap' instead)
+                            (To create WiFi hotspot use '--ap' instead)
     -o <interface>          Specify an inteface to provide Internet from.
                             (Note using this with default DNS option may leak
                             queries to other interfaces)
-    -n                      Do not provide Internet (See Notice 1)
+    -n                      Do not provide Internet
     --ban-priv              Disallow clients to access my private network
     
     -g <ip>                 This host's IPv4 address in subnet (mask is /24)
                             (example: '192.168.5.1' or '5' shortly)
     -6                      Enable IPv6 (NAT)
-    --no4                   Disable IPv4 Internet (not forwarding IPv4)
-                            (See Notice 1). Usually used with '-6'
+    --no4                   Disable IPv4 Internet (not forwarding IPv4).
+                            Usually used with '-6'
                             
     --p6 <prefix>           Set IPv6 LAN address prefix (length 64) 
                             (example: 'fd00:0:0:5::' or '5' shortly) 
@@ -247,44 +327,47 @@ Options:
     --dns <ip>|<port>|<ip:port>
                             DNS server's upstream DNS.
                             Use ',' to seperate multiple servers
-                            (default: use /etc/resolve.conf)
+                            (default: use /etc/resolv.conf)
                             (Note IPv6 addresses need '[]' around)
     --no-dns                Do not serve DNS
     --no-dnsmasq            Disable dnsmasq server (DHCP, DNS, RA)
     --catch-dns             Transparent DNS proxy, redirect packets(TCP/UDP) 
                             whose destination port is 53 to this host
-    --log-dns               Show DNS query log
+    --log-dns               Show DNS query log (dnsmasq)
     --dhcp-dns <IP1[,IP2]>|no
-                            Set IPv4 DNS offered by DHCP (default: this host)
+                            Set IPv4 DNS offered by DHCP (default: this host).
     --dhcp-dns6 <IP1[,IP2]>|no
                             Set IPv6 DNS offered by DHCP (RA) 
                             (default: this host)
                             (Note IPv6 addresses need '[]' around)
+                            Using both above two will enable '--no-dns' 
     --hostname <name>       DNS server associate this name with this host.
                             Use '-' to read name from /etc/hostname
     -d                      DNS server will take into account /etc/hosts
     -e <hosts_file>         DNS server will take into account additional 
                             hosts file
+    --dns-nocache           DNS server no cache
     
     --mac <MAC>             Set MAC address
     --random-mac            Use random MAC address
  
     --tp <port>             Transparent proxy,
-                            redirect non-LAN TCP and UDP traffic to port.
-                            (usually used with '--dns')
+                            redirect non-LAN TCP and UDP(not tested) traffic to
+                            port. (usually used with '--dns')
     
-  Wifi hotspot options:
+  WiFi hotspot options:
     --ap <wifi interface> <SSID>
-                            Create Wifi access point
+                            Create WiFi access point
     -p, --password <password>   
-                            Wifi password
-    --qr                    Show Wifi QR code in terminal
+                            WiFi password
+    --qr                    Show WiFi QR code in terminal (need qrencode)
     
     --hidden                Hide access point (not broadcast SSID)
     --no-virt               Do not create virtual interface
                             Using this you can't use same wlan interface
                             for both Internet and AP
-    -c <channel>            Channel number (default: 1)
+    --virt-name <name>      Set name of virtual interface
+    -c <channel>            Specify channel (default: use current, or 1 / 36)
     --country <code>        Set two-letter country code for regularity
                             (example: US)
     --freq-band <GHz>       Set frequency band: 2.4 or 5 (default: 2.4)
@@ -293,18 +376,33 @@ Options:
                             (default: 2)
     --psk                   Use 64 hex digits pre-shared-key instead of
                             passphrase
-    --mac-filter            Enable Wifi hotspot MAC address filtering
-    --mac-filter-accept     Location of Wifi hotspot MAC address filter list
+    --mac-filter            Enable WiFi hotspot MAC address filtering
+    --mac-filter-accept     Location of WiFi hotspot MAC address filter list
                             (defaults to /etc/hostapd/hostapd.accept)
     --hostapd-debug <level> 1 or 2. Passes -d or -dd to hostapd
     --isolate-clients       Disable wifi communication between clients
-    
-    --ieee80211n            Enable IEEE 802.11n (HT)
-    --ieee80211ac           Enable IEEE 802.11ac (VHT)
-    --ht_capab <HT>         HT capabilities (default: [HT40+])
-    --vht_capab <VHT>       VHT capabilities
-    
     --no-haveged            Do not run haveged automatically when needed
+    --hs20                  Enable Hotspot 2.0
+
+    WiFi 4 (802.11n) configs:
+    --wifi4                 Enable IEEE 802.11n (HT)
+    --req-ht                Require station HT (High Throughput) mode
+    --ht-capab <HT caps>    HT capabilities (default: [HT40+])
+
+    WiFi 5 (802.11ac) configs:
+    --wifi5                 Enable IEEE 802.11ac (VHT)
+    --req-vht               Require station VHT (Very High Thoughtput) mode
+    --vht-capab <VHT caps>  VHT capabilities
+    
+    --vht-ch-width <index>  Index of VHT channel width:
+                                0 for 20MHz or 40MHz (default)
+                                1 for 80MHz
+                                2 for 160MHz
+                                3 for 80+80MHz (Non-contigous 160MHz)    
+    --vht-seg0-ch <channel> Channel index of VHT center frequency for primary 
+                            segment. Use with '--vht-ch-width'
+    --vht-seg1-ch <channel> Channel index of VHT center frequency for secondary
+                            (second 80MHz) segment. Use with '--vht-ch-width 3'
 
   Instance managing:
     --daemon                Run in background
@@ -316,59 +414,103 @@ Options:
     --stop <id>             Stop a running instance
         For <id> you can use PID or subnet interface name.
         You can get them with '--list-running'
-
-    Notice 1:   This script assume your host's default policy won't forward
-                packets, so the script won't explictly ban forwarding in any
-                mode. In some unexpected case may cause unwanted packets 
-                leakage between 2 networks, which you should be aware of if you
-                want isolated network
+                
+Examples:
+    lnxrouter -i eth1
+    lnxrouter --ap wlan0 MyAccessPoint -p MyPassPhrase
+    lnxrouter -i eth1 --tp <transparent-proxy> --dns <dns-proxy>
 ```
 
-> These changes to system will not be restored by script's cleanup:
-> 1. `/proc/sys/net/ipv4/ip_forward = 1` and `/proc/sys/net/ipv6/conf/all/forwarding = 1`
-> 1. dnsmasq in Apparmor complain mode
-> 1. Kernel module `nf_nat_pptp` loaded
-> 1. The wifi device which is used to create hotspot is `rfkill unblock`ed
-> 1. Wifi country code, if user specified
+</details>
 
+## What changes are done to Linux system
 
-## Dependencies
+On exit of a linux-router instance, script **will do cleanup**, i.e. undo most changes to system. Though, **some** changes (if needed) will **not** be undone, which are:
 
-- bash
-- procps or procps-ng
-- iproute2
-- dnsmasq
-- iptables (legacy. nft not tested)
-- WiFi hotspot dependencies
-   - hostapd
-   - iw
-   - iwconfig (you only need this if 'iw' can not recognize your adapter)
-   - haveged (optional)
-   - qrencode (optional)
+1. `/proc/sys/net/ipv4/ip_forward = 1` and `/proc/sys/net/ipv6/conf/all/forwarding = 1`
+2. dnsmasq in Apparmor complain mode
+3. hostapd in Apparmor complain mode
+4. Kernel module `nf_nat_pptp` loaded
+5. The wifi device which is used to create hotspot is `rfkill unblock`ed
+6. WiFi country code, if user assigns
+
+## Meet contributor(s) and become one of them
+
+Visit [**my homepage** 🏡](https://garywill.github.io) to see **more tools and projects** 🛠️.
+
+> [❤️ Buy me a coffee](https://github.com/garywill/receiving/blob/master/receiving_methods.md) , this project took me lots of time! ([❤️ 扫码领红包并打赏一个!](https://github.com/garywill/receiving/blob/master/receiving_methods.md))
+> 
+> 🥂 ( ^\_^) o自自o (^_^ ) 🍻
+
+🤝 Bisides, thank [create_ap](https://github.com/oblique/create_ap) by [oblique](https://github.com/oblique). This script was forked from create\_ap. Now they are quite different. (See `history` branch for how I modified create_ap). 🤝 Also thank those who contributed to that project.
+
+👨‍💻 You can be contributor, too! 
+
+- 🍃 There're some TO-DOs listed, in both [readme TODO](#todo) and [in the code file](https://github.com/garywill/linux-router/search?q=TODO&type=code)
+- 🍃 Also some [unfulfilled enhancements in the Issues](https://github.com/garywill/linux-router/issues?q=is%3Aissue+is%3Aopen+label%3Aenhancement)
+- 🙋‍♂️ 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
 
 ## TODO
-
 - WPA3
 - Global IPv6
-- Explictly ban forwarding if not needed
-- Bring bridging method back
 
-## Donate
+## License
 
-[Buy me a coffee](https://github.com/garywill/receiving/blob/master/receiving_methods.md) , this project took me lots of time!
+linux-router is LGPL licensed
+
+<details>
+
+```
+linux-router
+Copyright (C) 2018  garywill
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+```
+
+</details>
+
+Upstream create_ap was BSD licensed
+
+<details>
+
+```
+Copyright (c) 2013, oblique
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+```
+
+</details>
 
 
-[打赏一个](https://github.com/garywill/receiving/blob/master/receiving_methods.md) 
-
-## For developers
-
-**Many thanks to project [create_ap](https://github.com/oblique/create_ap)**.
-
-This script was forked from create\_ap. Now it's quite different from it. (See `history` branch for how I modified create_ap)
-
-There're some TO-DOs listed, at both above and in the code file. We'll appreciate your help.
-
-------------------
-
-More of my projects: https://garywill.github.io
-