TCP/IP Illustrated cover
TCP/IP Illustrated
by W. Richard Stevens, Kevin R. Fall, Gary R. Wright
ISBN: 020163354X
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moreati · 2020-06-10 · Original thread
Protocol Control Block for anyone else wondering https://www.oreilly.com/library/view/tcpip-illustrated/02016...
laichzeit0 · 2013-12-28 · Original thread
For a walk through of the BSD TCP/IP source code there's also Steven's TCP/IP illustrated volume 2. The first few chapters painstakingly go through mbufs and exactly how the data structure is implemented and used. Much of this won't apply to current kernels but it's probably close enough for what Van Jacobson is talking about.

http://www.amazon.com/TCP-IP-Illustrated-Implementation-Vol/...