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huge tap/bridge overhaul; udp node; dhcp node; DHCP example

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soypat
2025-06-15 18:01:04 -03:00
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@@ -21,6 +21,26 @@ Userspace networking primitives.
- [`lneto/ntp`](./ntp): NTP implementation and low level logic. Includes NTP time primitives manipulation and conversion to Go native types.
- [`lneto/internal`](./internal): Lightweight and flexible ring buffer implementation and debugging primitives.
### Abstractions
The following interface is implemented by networking stack nodes and the stack themselves.
```go
type StackNode interface {
// Encapsulate receives a buffer the receiver must fill with data.
// The receiver's start byte is at carrierData[frameOffset].
Encapsulate(carrierData []byte, frameOffset int) (int, error)
// Demux receives a buffer the receiver must decode and pass on to corresponding child StackNode(s).
// The receiver's start byte is at carrierData[frameOffset].
Demux(carrierData []byte, frameOffset int) error
// LocalPort returns the port of the node if applicable or zero. Used for UDP/TCP nodes.
LocalPort() uint16
// Protocol returns the protocol of this node if applicable or zero. Usually either a ethernet.Type (EtherType) or lneto.IPProto (IP Protocol number).
Protocol() uint64
// ConnectionID returns a pointer to the connection ID of the StackNode.
// A change in the ID means the node is no longer valid and should be discarded.
// A change in the ID could mean the connection was closed by the user or that the node will not send nor receive any more data over said connection ID.
ConnectionID() *uint64
```
## Install
How to install package with newer versions of Go (+1.16):