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/*
* linux/fs/proc/net.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*
* gjh 3/'93 heim@peanuts.informatik.uni-tuebingen.de (Gerald J. Heim)
* most of this file is stolen from base.c
* it works, but you shouldn't use it as a guideline
* for new proc-fs entries. once i'll make it better.
* fvk 3/'93 waltje@uwalt.nl.mugnet.org (Fred N. van Kempen)
* cleaned up the whole thing, moved "net" specific code to
* the NET kernel layer (where it belonged in the first place).
* Michael K. Johnson (johnsonm@stolaf.edu) 3/93
* Added support from my previous inet.c. Cleaned things up
* quite a bit, modularized the code.
* fvk 4/'93 waltje@uwalt.nl.mugnet.org (Fred N. van Kempen)
* Renamed "route_get_info()" to "rt_get_info()" for consistency.
*
* proc net directory handling functions
*/
#include <linux/autoconf.h>
#include <asm/segment.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
/* forward references */
static int proc_readnet(struct inode * inode, struct file * file,
char * buf, int count);
static int proc_readnetdir(struct inode *, struct file *,
struct dirent *, int);
static int proc_lookupnet(struct inode *,const char *,int,struct inode **);
/* the get_*_info() functions are in the net code, and are configured
in via the standard mechanism... */
extern int unix_get_info(char *);
#ifdef CONFIG_INET
extern int tcp_get_info(char *);
extern int udp_get_info(char *);
extern int raw_get_info(char *);
extern int arp_get_info(char *);
extern int dev_get_info(char *);
extern int rt_get_info(char *);
#endif /* CONFIG_INET */
static struct file_operations proc_net_operations = {
NULL, /* lseek - default */
proc_readnet, /* read - bad */
NULL, /* write - bad */
proc_readnetdir, /* readdir */
NULL, /* select - default */
NULL, /* ioctl - default */
NULL, /* mmap */
NULL, /* no special open code */
NULL, /* no special release code */
NULL /* can't fsync */
};
/*
* proc directories can do almost nothing..
*/
struct inode_operations proc_net_inode_operations = {
&proc_net_operations, /* default net directory file-ops */
NULL, /* create */
proc_lookupnet, /* lookup */
NULL, /* link */
NULL, /* unlink */
NULL, /* symlink */
NULL, /* mkdir */
NULL, /* rmdir */
NULL, /* mknod */
NULL, /* rename */
NULL, /* readlink */
NULL, /* follow_link */
NULL, /* bmap */
NULL, /* truncate */
NULL /* permission */
};
static struct proc_dir_entry net_dir[] = {
{ 1,2,".." },
{ 8,1,"." },
{ 128,4,"unix" }
#ifdef CONFIG_INET
,{ 129,3,"arp" },
{ 130,5,"route" },
{ 131,3,"dev" },
{ 132,3,"raw" },
{ 133,3,"tcp" },
{ 134,3,"udp" }
#endif /* CONFIG_INET */
};
#define NR_NET_DIRENTRY ((sizeof (net_dir))/(sizeof (net_dir[0])))
static int proc_lookupnet(struct inode * dir,const char * name, int len,
struct inode ** result)
{
unsigned int ino;
int i;
*result = NULL;
if (!dir)
return -ENOENT;
if (!S_ISDIR(dir->i_mode)) {
iput(dir);
return -ENOENT;
}
i = NR_NET_DIRENTRY;
while (i-- > 0 && !proc_match(len,name,net_dir+i))
/* nothing */;
if (i < 0) {
iput(dir);
return -ENOENT;
}
ino = net_dir[i].low_ino;
if (!(*result = iget(dir->i_sb,ino))) {
iput(dir);
return -ENOENT;
}
iput(dir);
return 0;
}
static int proc_readnetdir(struct inode * inode, struct file * filp,
struct dirent * dirent, int count)
{
struct proc_dir_entry * de;
unsigned int ino;
int i,j;
if (!inode || !S_ISDIR(inode->i_mode))
return -EBADF;
ino = inode->i_ino;
if (((unsigned) filp->f_pos) < NR_NET_DIRENTRY) {
de = net_dir + filp->f_pos;
filp->f_pos++;
i = de->namelen;
ino = de->low_ino;
put_fs_long(ino, &dirent->d_ino);
put_fs_word(i,&dirent->d_reclen);
put_fs_byte(0,i+dirent->d_name);
j = i;
while (i--)
put_fs_byte(de->name[i], i+dirent->d_name);
return j;
}
return 0;
}
static int proc_readnet(struct inode * inode, struct file * file,
char * buf, int count)
{
char * page;
int length;
int end;
unsigned int ino;
if (count < 0)
return -EINVAL;
if (!(page = (char*) __get_free_page(GFP_KERNEL)))
return -ENOMEM;
ino = inode->i_ino;
switch (ino) {
#ifdef CONFIG_INET
case 128:
length = unix_get_info(page);
break;
case 129:
length = arp_get_info(page);
break;
case 130:
length = rt_get_info(page);
break;
case 131:
length = dev_get_info(page);
break;
case 132:
length = raw_get_info(page);
break;
case 133:
length = tcp_get_info(page);
break;
case 134:
length = udp_get_info(page);
break;
#endif /* CONFIG_INET */
default:
free_page((unsigned long) page);
return -EBADF;
}
if (file->f_pos >= length) {
free_page((unsigned long) page);
return 0;
}
if (count + file->f_pos > length)
count = length - file->f_pos;
end = count + file->f_pos;
memcpy_tofs(buf, page + file->f_pos, count);
free_page((unsigned long) page);
file->f_pos = end;
return count;
}