---
title: NEFilterPacketHandler
framework: networkextension
role: symbol
role_heading: Type Alias
path: networkextension/nefilterpackethandler
---

# NEFilterPacketHandler

A type for Swift closures or ObjectiveC blocks that make filtering decisions about network packets.

## Declaration

```swift
typealias NEFilterPacketHandler = (NEFilterPacketContext, nw_interface_t, NETrafficDirection, UnsafeRawPointer, Int) -> NEFilterPacketProvider.Verdict
```

## Parameters

- `context`: The current filtering context.
- `interface`: The ingress or egress interface of the packet.
- `direction`: The direction the packet is flowing.
- `packetBytes`: The packet’s bytes.
- `packetLength`: The length of the packet’s bytes.

## Return Value

Return Value A verdict on whether the framework should allow, drop, or delay the packet. If the verdict is NEFilterPacketProvider.Verdict.delay, the framework assumes the handler already called delayCurrentPacket(_:).

## See Also

### Filtering packets

- [packetHandler](networkextension/nefilterpacketprovider/packethandler.md)
- [NEFilterPacketContext](networkextension/nefilterpacketcontext.md)
- [NETrafficDirection](networkextension/netrafficdirection.md)
- [NEFilterPacketProvider.Verdict](networkextension/nefilterpacketprovider/verdict.md)