kernel socket 实例

#include <asm/atomic.h>#include <asm/checksum.h>#include <asm/unaligned.h>#include <linux/module.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/net.h>#include <linux/in.h>#include <linux/types.h>#include <linux/kthread.h>#include <linux/wait.h>#include <linux/skbuff.h>#include <linux/string.h>#include <linux/sysctl.h>#include <linux/netfilter.h>#include <linux/netfilter_ipv4.h>#include <linux/ip.h>#include <linux/workqueue.h>#include <linux/jiffies.h>#include <linux/route.h>#include <linux/stddef.h>#include <linux/mutex.h>#include <linux/icmp.h>#include <net/net_namespace.h>#include <net/sock.h>#include <net/route.h>#include <net/inet_connection_sock.h>#include <net/request_sock.h>#define err(msg) printk(KERN_ERR "%s failed.\n", msg)#define SA struct sockaddrstatic struct task_struct *task;static int threadfn(void *data){    struct socket *sock;    struct sockaddr_in addr;    if (sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock) < 0) {        err("sock_create_kern");        goto out;    }    sock->sk->sk_reuse = 1;    memset(&addr, '\0', sizeof(addr));        addr.sin_family     = AF_INET;    addr.sin_addr.s_addr     = htonl(INADDR_ANY);    addr.sin_port        = htons(8888);    if (kernel_bind(sock, (SA *)&addr, sizeof(addr)) < 0) {        err("kernel_bind");        goto err;    }    if (kernel_listen(sock, 1024) < 0) {        err("kernel_listen");        goto err;    }    while (!kthread_should_stop()) {        struct socket *newsock;        struct inet_connection_sock *icsk = inet_csk(sock->sk);            wait_event_interruptible(*sock->sk->sk_sleep,                !reqsk_queue_empty(&icsk->icsk_accept_queue) || kthread_should_stop());        if (!reqsk_queue_empty(&icsk->icsk_accept_queue)) {            if (kernel_accept(sock, &newsock, 0) != 0) {                err("kernel_accept");                goto err;            }            printk(KERN_INFO "accept a new connection request.\n");            sock_release(newsock);        }    }err:    sock_release(sock);out:    return 0;}static int __init main_init(void){    task = kthread_run(threadfn, NULL, "listen thread");    return 0;}static void __exit main_exit(void){    kthread_stop(task);}module_init(main_init);module_exit(main_exit);MODULE_LICENSE("GPL");

转自
http://blog.chinaunix.net/uid-26748923-id-3548615.html