PNDPD - NDP Responder + Proxy

Features

Efficiently process incoming packets using bpf (which runs in the kernel)
Respond to all NDP solicitations on an interface
Respond to NDP solicitations for whitelisted addresses on an interface
Proxy NDP between interfaces with an optional whitelist
Optionally determine whitelist automatically based on the IPs assigned to the interfaces
Permissions required: root or CAP_NET_RAW

Usage

pndpd config <path to file>
pndpd respond <interface> <optional whitelist of CIDRs separated by a semicolon>
pndpd proxy <interface1> <interface2> <optional whitelist of CIDRs separated by a semicolon applied to interface2>

More options and additional documentation in the example config file (pndpd.conf).

Developing

It is easy to add functionality to PNDPD. For additions outside the core functionality you only need to keep the following methods in mind:

package main
import "pndpd/pndp"

pndp.ParseFilter(f string) []*net.IPNet

responderInstance := pndp.NewResponder(iface string, filter []*net.IPNet, autosenseInterface string)
responderInstance.Start()
responderInstance.Stop()

proxyInstance := pndp.NewProxy(iface1 string, iface2 string, filter []*net.IPNet, autosenseInterface string)
proxyInstance.Start()
proxyInstance.Stop()

Pull requests are welcome for any functionality you add.