2016-08-16-reading--understanding-linux-network-internals.md

Kernel versions: https://github.com/torvalds/linux/commit/194dc870a5890e855ecffb30f3b80ba7c88f96d6

• Starter Knowledges

  • https://en.wikipedia.org/wiki/OSI_model
  • http://docwiki.cisco.com/wiki/Internetworking_Technology_Handbook
    • http://docwiki.cisco.com/wiki/Internetworking_Basics
  • https://www.digitalocean.com/community/tutorials/an-introduction-to-networking-terminology-interfaces-and-protocols
  • Socket Programming: https://github.com/hi-ogawa/socket-programming-basics (L3, L4)

• part 1: struct sk_buff, struct net_device, sysctl

• part 2: Network device, device driver initialization (L1, L2 ??)

  • device and driver initialization
  • Figure 5-1. Kernel initialization path
  • Figure 6-1. Driver-device association via bus descriptor
  • NOTE:
    • /sbin/hotplug seems depreated in favor of udev
    • separation of net_device_ops from net_device
  • Qs.
    • how bus descriptor is initialized ?

• part 3: Frame RX/TX (between L2 and L3)

  • how to hanlde data from hardware
    • interrupt, softirq, tasklet
    • NOTE: - LWN: Eliminating tasklets - []

• part 4: Bridging (L2)

• part 5: IPv4, ICMP (L3)

• part 6: ARP (L2, L3)

• part 7: Routing (L3)

• TODO

  • how L4 (e.g. TCP) is implemented ?