The Journey of a Packet Through the Linux Network Stack
The Journey of a Packet Through the Linux Network Stack
... plus hints on Lab 9
Some Words
Assume IP version 4 Codes are from Kernel 2.6.9.EL
(use in Lab 9) Ideas are similar
Linux High-Level Network Stack
Interface to users TCP/UDP/IP etc... Queue for device
Image from
Receiving a Packet (Device)
Network card
receives a frame
issues an interrupt
Driver
handles the interrupt
?Frame RAM ?Allocates sk_buff (called skb) ?Frame skb
Aside: sk_buff (skbuff.h)
Generic buffer for all packets Pointers to skb are passed up/down Can be linked together
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