看linux网络实现(linux 2.6.15)

jinhaijun8106

                昨天看了些linux的网络实现，
　　//kernel 2.6.15
　　1 sending message
　　
sys_socketcall -->sys_sendmsg --> sock_sendmsg
-->__sock_sendmsg -->sock->ops->sendmsg
(tcp_sendmsg,defined in struct proto tcp_prot)-->tcp_push_one -->
tcp_transmit_skb
-->tp->af_specific->queue_xmit(ip_queue_xmit,defined in struct
tcp_func ipv4_specific) --> dst_output --> skb->dst->output
(ip_output,but i don't find where it defined now) -->
ip_finish_output -->ip_finish_output2 -->
dst->neighbour->output(i do not know what it given, maybe
neigh_connected_output) --> neigh->ops->queue_xmit
(dev_queue_xmit) --> dev->hard_start_xmit
sys_socket (kernel process the "socket" function in user level)
　　　　1.1-->sock_create
　　　　1.2-->sock_map_fd
　　　　1.2.1-->get_unused_fd
　　　　1.2.2-->get_empty_filp
　　　　1.2.3-->sock->file = file
　
　　　1.2.4-->file->f_op = SOCK_INODE(sock)->i_fop =
&socket_file_ops; (where socket_file_ops.unlocked_ioctl =sock_ioctl)
　　　　1.2.5-->fd_install (fdt->fd[fd]=file,this can help us find the file by fd)
               
               
               
               
               

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