myipmr.c

一个基于linux的TCP/IP协议栈的实现

static kmem_cache_t *mymrt_cachep __read_mostly;
static struct timer_list myipmr_expire_timer;

static int myipmr_device_event(struct notifier_block *this, 
				unsigned long event, void *ptr)
{
	return 0;
}

static struct notifier_block myip_mr_notifier={
	.notifier_call = myipmr_device_event,
};

static void myipmr_expire_process(unsigned long dummy)
{

}

int myip_mr_input(struct sk_buff *skb)
{
	return 0;
}

static int myipmr_vif_open(struct inode *inode, struct file *file)
{
	return 0;
}

static struct file_operations myipmr_vif_fops = {
	.owner	 = THIS_MODULE,
	.open    = myipmr_vif_open,
	.read    = myseq_read,
	.llseek  = myseq_lseek,
	.release = myseq_release_private,
};

static int myipmr_mfc_open(struct inode *inode, struct file *file)
{
	return 0;
}

static struct file_operations myipmr_mfc_fops = {
	.owner	 = THIS_MODULE,
	.open    = myipmr_mfc_open,
	.read    = myseq_read,
	.llseek  = myseq_lseek,
	.release = myseq_release_private,
};

void __init myip_mr_init(void)
{
	mymrt_cachep = kmem_cache_create("myip_mrt_cache",
					sizeof(struct mfc_cache),
					0, SLAB_HWCACHE_ALIGN,
					NULL, NULL);
	if( !mymrt_cachep )
		panic( "cannot allocate ip_mrt_cache" );

	init_timer( &myipmr_expire_timer );
	myipmr_expire_timer.function = myipmr_expire_process;
	register_netdevice_notifier(&myip_mr_notifier);
#ifdef CONFIG_PROC_FS	
	proc_net_fops_create("myip_mr_vif", 0, &myipmr_vif_fops);
	proc_net_fops_create("myip_mr_cache", 0, &myipmr_mfc_fops);
#endif
}

void __exit myip_mr_exit(void)
{
#ifdef CONFIG_PROC_FS
	remove_proc_entry( "myip_mr_vif", proc_net );
	remove_proc_entry( "myip_mr_cache", proc_net );
#endif
	unregister_netdevice_notifier( &myip_mr_notifier );
	if( mymrt_cachep )
		kmem_cache_destroy( mymrt_cachep );
}