Network programming 内核中与包遍历相关的查询
阅读本书后，了解Linux网络的内部结构。 我开始了解一些我们如何从网络获取数据包的概念：-Network programming 内核中与包遍历相关的查询,network-programming,linux-kernel,linux-device-driver,kernel,Network Programming,Linux Kernel,Linux Device Driver,Kernel,阅读本书后，了解Linux网络的内部结构。 我开始了解一些我们如何从网络获取数据包的概念：- > When working in interrupt driven model, the nic registers an > interrupt handler; > • This interrupt handler will be called when a frame is received; > • Typically in the handl
> When working in interrupt driven model, the nic registers an
> interrupt handler;
> • This interrupt handler will be called when a frame is received;
> • Typically in the handler, we allocate sk buff by calling
> dev alloc skb();
> • Copies data from nic’s buffer to this struct just created;
> • nic call generic reception routine netif rx();
> • netif rx() put frame in per cpu queue;
> • if queue is full, drop!
> • net rx action() decision based on skb->protocol;
> • This function basically dequeues the frame and delivery a copy
> for every protocol handler;
> • ptype all and ptype base queues
> ip v4 rcv() will receive the ip datagram (if is a ipv4 packet);
•ip checksum, check ip headers, ....
• ip rcv finish() makes route decision (ip forward() or ip local delivery())