static const struct file_operations arp_seq_fops = {
.owner = THIS_MODULE,
.open = arp_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_net,
};static int __net_init arp_net_init(struct net *net)
{
if (!proc_create("arp", S_IRUGO, net->proc_net, &arp_seq_fops))
return -ENOMEM;
return 0;
} static inline struct proc_dir_entry *proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent, const struct file_operations *proc_fops)
{
return proc_create_data(name, mode, parent, proc_fops, NULL);
}static int arp_seq_open(struct inode *inode, struct file *file)
{
return seq_open_net(inode, file, &arp_seq_ops, sizeof(struct neigh_seq_state));
}static const struct seq_operations arp_seq_ops = {
.start = arp_seq_start,
.next = neigh_seq_next,
.stop = neigh_seq_stop,
.show = arp_seq_show,
};struct ctl_table
{
const char *procname; /* Text ID for /proc/sys, or zero */
void *data;
int maxlen;
umode_t mode;
struct ctl_table *child; /* Deprecated */
proc_handler *proc_handler; /* Callback for text formatting */
struct ctl_table_poll *poll;
void *extra1;
void *extra2;
};struct ifreq data; fd = socket(PF_INET, SOCK_DGRAM, 0); < ... initialize "data" ...> err = ioctl(fd, SIOCSIFMTU, &data);
int socket(int domain, int type, int protocol)
#define NETLINK_ROUTE 0 /* Routing/device hook */ #define NETLINK_UNUSED 1 /* Unused number */ #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */ #define NETLINK_FIREWALL 3 /* Unused number, formerly ip_queue */ .....
原文：http://blog.csdn.net/windeal3203/article/details/43306775