Network support in the kernel is implemented primarily in the BSD layer. The BSD flavors of UNIX are renowned for their robust and secure networking support. Consequently, code from the BSD networking stack has made its way into a wide variety of operating systems, including Mac OS X and iOS. While the networking support is primarily in the BSD layer, it has hooks into I/O Kit, which provides the interface for building hardware-based network drivers. A conceptual view of the kernel network architecture is shown in Figure 13-1.
KeywordsNetwork Interface Filter Function Network Device User Space Incoming Packet
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