Linux内核协议栈-主要函数调用栈

本文主要记录Linux协议栈相关的主要系统调用的一些主要的函数调用栈，备忘。目前添加socket/connect

1.sys_socket

bsd socket layer

=> sys_create net/socket.c

=> socket_create net/socket.c

=> __socket_create net/socket.c

=> sock_alloc net/socket.c

inet sock layer

=> net_families[family]->create net/socket.c

=> inet_create net/ipv4/af_inet.c

=> list_for_each_entry_rcu(answer, &inetsw[sock->type], list)

=> sock->ops = answer->ops //绑定每个协议族的proto_ops到socket结构上，proto_ops通常是与下层传输层的接口比如inet_connect,inet_*

=> sk_alloc(net, PF_INET, GFP_KERNEL, answer->prot) net/core/sock.c

=> sk_prot_alloc net/core/sock.c

=> kmem_cache_alloc(prot->slab) net/core/sock.c

=> sk->sk_prot = prot; sk->family = family net/core/sock.c

=> sock_init_data net/core/sock.c

=> skb_queue_head_init(&sk->sk_receive_queue) net/core/sock.c

skb_queue_head_init(&sk->sk_write_queue)

skb_queue_head_init(&sk->sk_error_queue)

=> sk->sk_state = TCP_CLOSE

sk_set_socket(sk, sock)

=> sk->sk_prot->init(sk)

transport layer

=> tcp_v4_init_sock net/ipv4/tcp_ipv4.c

=> tcp_init_sock net/ipv4/tcp.c

=> icsk->icsk_af_ops = &ipv4_specific net/ipv4/tcp_ipv4.c //这里挂接传输层的读写处理，每个sock结构有一个inet_connection_sock的队列负责接收对端的socket

2.connect

bsd socket layer

=> sys_connect net/socket.c

=> sock->ops->connect(sock->proto_ops->connect) net/socket.c

inet sock layer

=> inet_stream_ops->connect net/ipv4/af_inet.c

=> inet_stream_connect net/ipv4/af_inet.c

=> __inet_stream_connect net/ipv4/af_inet.c

=> sock->sk->sk_prot->connect net/ipv4/af_inet.c

transport layer

=> tcp_prot->connect(tcp_v4_connect) net/ipv4/tcp_ipv4.c

=> ip_route_connect net/ipv4/tcp_ipv4.c

=> ip_route_connect_init include/net/route.h

=> flowi4_init_output include/net/flow.h

=> tcp_set_state(sk, TCP_SYN_SENT) net/ipv4/tcp_ipv4.c

=> tcp_connect net/ipv4/tcp_output.c

=> tcp_connect_init net/ipv4/tcp_output.c

=> sk_stream_alloc_skb net/ipv4/tcp.c

=> __alloc_skb net/core/skbuff.c

=> kmem_cache_alloc_node

=> tcp_connect_queue_skb net/ipv4/tcp_output.c

=> __tcp_add_write_queue_tail include/net/tcp.h

=> tcp_transmit_skb net/ipv4/tcp_output.c

=> icsk->icsk_af_ops->queue_xmit

ip layer

=> ip_queue_xmit net/ipv4/ip_output.c

=> ip_route_output_ports net/ipv4/ip_output.c 路由

=> ip_local_out include/net/ip.h

=> ip_local_out_sk net/ipv4/ip_output.c

=> __ip_local_out net/ipv4/ip_output.c netfilter检查

=> nf_hook (netfilter hooks) include/linux/netfilter.h

=> nf_hook_thresh include/linux/netfilter.h

=> nf_hook_slow include/linux/netfilter.h

=> nf_iterate net/netfilter/core.c

=> dst_output_sk include/net/dst.h

=> dst_entry->output include/net/dst.h

=> ip_output? net/ipv4/ip_output.c

=> ip_finish_output net/ipv4/ip_output.c

=> ip_fragment net/ipv4/ip_output.c

=> ip_finish_output2 net/ipv4/ip_output.c

hardware related layer

=> dst_neigh_output include/net/dst.h

=> neigh_hh_output include/net/neighbour.h

=> dev_queue_xmit net/core/dev.c

=> __dev_queue_xmit net/core/dev.c

=> netdev_pick_tx net/core/flow_dissector.c

=> __dev_xmit_skb net/core/dev.c

=> q->enqueue

=> __qdisc_run(q) net/sched/sch_generic.c

=> qdisc_restart net/sched/sch_generic.c

=> dequeue_skb net/sched/sch_generic.c

=> skb_get_tx_queue net/sched/sch_generic.c

=> netdev_get_tx_queue net/sched/sch_generic.c

=> sch_direct_xmit net/sched/sch_generic.c

=> validate_xmit_skb_list net/sched/sch_generic.c

=> dev_hard_start_xmit net/core/dev.c

=> xmit_one net/core/dev.c

=> netdev_start_xmit include/linux/netdevice.h

=> net_device_ops->ndo_start_xmit include/linux/netdevice.h

=> driver layer?

ref:

1. linux-3.19.3 src

2. Linux IP Networking A Guide to the Implementation and Modification of the Linux Protocol Stack