90 lines
1.7 KiB
C
90 lines
1.7 KiB
C
#include <linux/tkernel.h>
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#include <linux/seq_file.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <net/sock.h>
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bool nonpriv_prot_sock_flag[PROT_SOCK];
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EXPORT_SYMBOL(nonpriv_prot_sock_flag);
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static int netbind_proc_show(struct seq_file *m, void *v)
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{
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int i;
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for (i = 1; i < PROT_SOCK; i++) {
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if (nonpriv_prot_sock_flag[i])
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seq_printf(m, "%d\n", i);
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}
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return 0;
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}
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static int netbind_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, netbind_proc_show, NULL);
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}
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static ssize_t netbind_proc_write(struct file *file, const char __user *buf,
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size_t length, loff_t *ppos)
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{
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int port, en;
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char *buffer, *p;
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int err;
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if (!buf || length > PAGE_SIZE)
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return -EINVAL;
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buffer = (char *)__get_free_page(GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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err = -EFAULT;
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if (copy_from_user(buffer, buf, length))
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goto out;
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err = -EINVAL;
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if (length < PAGE_SIZE)
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buffer[length] = '\0';
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else if (buffer[PAGE_SIZE-1])
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goto out;
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en = 1;
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p = buffer;
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if (*p == '+') {
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p++;
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} else if (*p == '-') {
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en = 0;
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p++;
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}
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if (*p < '0' || *p > '9')
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goto out;
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port = simple_strtoul(p, &p, 0);
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if (*p != '\n' && *p != '\r' && *p != '\0')
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goto out;
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if (port <= 0 || port >= PROT_SOCK)
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goto out;
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nonpriv_prot_sock_flag[port] = en;
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err = length;
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out:
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free_page((unsigned long)buffer);
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return err;
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}
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static const struct proc_ops netbind_proc_ops = {
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.proc_open = netbind_proc_open,
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.proc_read = seq_read,
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.proc_write = netbind_proc_write,
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.proc_lseek = seq_lseek,
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.proc_release = single_release,
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};
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static int __init nonpriv_netbind_init(void)
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{
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proc_create("nonpriv_netbind", 0, proc_tkernel, &netbind_proc_ops);
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return 0;
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}
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late_initcall(nonpriv_netbind_init);
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