• NKE Implementation

• Review of 4.4BSD Network Architecture

• Network KPI Mechanisms

• Tracking KEXT Usage

• Instance-Specific Persistent Data

• KEXT Dependency Information

• Working with Memory Buffers

• Structure of an mbuf

• Manipulating an mbuf or mbuf Chain

• Blocking and Nonblocking mbuf Operations

• Working with Sockets in the Kernel

• Manipulating Sockets and File Descriptors

• Socket Input and Output

• For More Information

• Using the Kernel Control API for KEXT Control

• Supporting Kernel Controls in Your KEXT

• Connection from the Client Process

• Using the kern_event API for Kernel Notifications

• Receiving Kernel Event Notifications

• Implementing a Preference File for an NKE

• Helpful Tips

• Creating a Socket Filter

• Socket Filter Example: tcplognke

• The Anatomy of an IP Filter

• IP Filter Gotchas

• Interface Filter Functions and Callbacks

• Common Caveats

• Network Interface Callbacks

• Installing and Removing Network Interfaces

• Protocol Plumbers

• Sending Data

• Receiving Data

• Kernel Utilities

• _MALLOC

• _FREE

• printf

• proc_exiting

• proc_is64bit

• proc_rele

• proc_self

• proc_suser

• msleep

• wakeup

• wakeup_one