EtherGuard-VPN/README.md

# Etherguard

[中文版README](README_zh.md)

A Full Mesh Layer2 VPN based on wireguard-go  

OSPF can find best route based on it's cost.  
But sometimes the lentancy are different in the packet goes and back.  
I'am thinking, is it possible to find the best route based on the **single-way latency**?  
For example, I have two routes A and B at node N1, both of them can reach my node N2. A goes fast, but B backs fast.  
My VPN can automatically send packet through route A at node N1, and the packet backsfrom route B.

Here is the solution. This VPN `Etherguard` can collect all the single-way lentancy from all nodes, and calculate the best route using [Floyd–Warshall algorithm](https://en.wikipedia.org/wiki/Floyd%E2%80%93Warshall_algorithm).

## Usage

```bash
Usage of ./etherguard-go:
  -config string
        Config path.
  -example
        Print example config
  -help
        Show this help
  -mode string
        Running mode. [super|edge|solve]
  -no-uapi
        Do not use UAPI
  -version
        Show version
```

## Mode

1. Static Mode: Similar to origional wireguard. [Introduction](example_config/static_mode/README.md).
2. Super Mode: Inspired by[n2n](https://github.com/ntop/n2n). [Introduction](example_config/super_mode/README.md).
3. P2P Mode: Inspired by[tinc](https://github.com/gsliepen/tinc). [Introduction](example_config/p2p_mode/README.md).

## Common Config Paramater

### Edge Config

1. `interface`
    1. `itype`: Interface type.
        1. `dummy`: Dymmy interface, drop any packet received. You need this if you want to setup it as a relay node.
        2. `stdio`: Wrtie to stdout，read from stdin.  
           Paramaters: `macaddrprefix`,`l2headermode`
        3. `udpsock`: Write to an udp socket, and read from an net assress.  
           Paramaters: `macaddrprefix`,`recvaddr`,`sendaddr`
        4. `vpp`: Integrate to VPP by libmemif.  
           Paramaters: `name`,`vppifaceid`,`vppbridgeid`,`macaddrprefix`,`mtu`
        5. `tap`: Read/Write to tap device from linux.  
           Paramaters: `name`,`macaddrprefix`,`vppifaceid`,`mtu`
    2. `name` : Device name
    3. `vppifaceid`: Interface ID。Muse be unique in same VPP runtime
    4. `vppbridgeid`: VPP Bridge ID. Fill 0 if you don't use it.
    5. `macaddrprefix`: Mac address Prefix。Real Mac address=[Prefix]:[vppifaceid]。  
    6. `recvaddr`: Listen address for `udpsock` mode
    7. `sendaddr`: Packet send address for `udpsock` mode
    8. `l2headermode`: For debug usage, `stdio` and `udpsock` mode only
        1. `nochg`: Do not change anything.
        2. `kbdbg`: Keyboard debug mode.  
                    Let me construct Layer 2 header by ascii character only.  
                    So that I can track the packet flow with `loglevel` option.
        3. `noL2`: Remove all Layer 2 header
2. `nodeid`: NodeID. Must be unique in the whole Etherguard network.
3. `nodename`: Node Name.
4. `privkey`: Private key. Same spec as wireguard.
5. `listenport`: UDP lesten port
6. `loglevel`: Log Level
    1. `loglevel`: wireguard原本的log紀錄器的loglevel。  
       有`debug`,`error`,`slient`三種程度
    2. `logtransit`: Log packets that neither the source or distenation is self.
    3. `logcontrol`: Log for all Control Message.
    4. `lognormal`: Log packets that either the source or distenation is self.
    5. `logntp`: NTP related logs.
7. `dynamicroute`: Log for dynamic route.
    1. `sendpinginterval`: Send `Ping` interval
    2. `dupchecktimeout`: Duplication chack timeout.
    3. `conntimeout`: Connection timeout.
    4. `savenewpeers`: Save peer info to local file.
    5. `supernode`: See [Super Mode](example_config/super_mode/README_zh.md)
    6. `p2p` See [P2P Mode](example_config/p2p_mode/README_zh.md)
    7. `ntpconfig`: NTP related settings
        1. `usentp`: USE NTP or not.
        2. `maxserveruse`: How many NTP servers should we use at once.  
           First time we will measure lentancy for all NTP server, next time it will use only fastest server.
        3. `synctimeinterval`: NTP sync interval.
        4. `ntptimeout`: NTP timeout
        5. `servers`: NTP server list
8. `nexthoptable`: Nexthop table。Only static mode use it. See [Static Mㄍㄟ](example_config/super_mode/README_zh.md)
9. `resetconninterval`: Reset the endpoint for peers. You may need this if that peer use DDNS.
10. `peers`: Peer info.
    1. `nodeid`: Node ID.
    2. `pubkey`: Public key.
    3. `pskey`: Preshared key. Not implement yet.
    4. `endpoint`: Peer enddpoint. Will be overwrite if the peer roaming unless static=true.
    5. `static`: Do not overwrite by roaming and reset the connection every `resetconninterval` seconds.

### Super config

See [Super Mode](example_config/super_mode/README.md).

## Build

### No-vpp version

Build Etherguard.  

Install Go 1.16

```bash
add-apt-repository ppa:longsleep/golang-backports
apt-get -y update
apt-install -y wireguard-tools golang-go build-essential
```

Build

```bash
make
```

### VPP version

Build Etherguard with VPP integrated.  
You need libmemif.so installed to run this version.

Install VPP and libemif

```bash
echo "deb [trusted=yes] https://packagecloud.io/fdio/release/ubuntu focal main" > /etc/apt/sources.list.d/99fd.io.list
curl -L https://packagecloud.io/fdio/release/gpgkey | sudo apt-key add -
apt-get -y update
apt-get install -y vpp vpp-plugin-core python3-vpp-api vpp-dbg vpp-dev libmemif libmemif-dev
```

Build

```bash
make vpp
```