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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.
* Alan Cox (gw4pts@gw4pts.ampr.org) 4/94
* Dusted off the code and added IPX. Fixed the 4K limit.
* Erik Schoenfelder (schoenfr@ibr.cs.tu-bs.de)
* /proc/net/snmp.
* Alan Cox (gw4pts@gw4pts.ampr.org) 1/95
* Added Appletalk slots
*
* proc net directory handling functions
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <asm/uaccess.h>
#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
static long proc_readnet(struct inode * inode, struct file * file,
char * buf, unsigned long count)
{
char * page;
int bytes=count;
int copied=0;
char *start;
struct proc_dir_entry * dp;
if (count < 0)
return -EINVAL;
dp = (struct proc_dir_entry *) inode->u.generic_ip;
if (!(page = (char*) __get_free_page(GFP_KERNEL)))
return -ENOMEM;
while (bytes>0)
{
int length, thistime=bytes;
if (bytes > PROC_BLOCK_SIZE)
thistime=PROC_BLOCK_SIZE;
length = dp->get_info(page, &start,
file->f_pos,
thistime,
(file->f_flags & O_ACCMODE) == O_RDWR);
/*
* We have been given a non page aligned block of
* the data we asked for + a bit. We have been given
* the start pointer and we know the length..
*/
if (length <= 0)
break;
/*
* Copy the bytes
*/
copy_to_user(buf+copied, start, length);
file->f_pos += length; /* Move down the file */
bytes -= length;
copied += length;
if (length<thistime)
break; /* End of file */
}
free_page((unsigned long) page);
return copied;
}
static struct file_operations proc_net_operations = {
NULL, /* lseek - default */
proc_readnet, /* read - bad */
NULL, /* write - bad */
NULL, /* readdir */
NULL, /* poll - 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 file-ops */
NULL, /* create */
NULL, /* lookup */
NULL, /* link */
NULL, /* unlink */
NULL, /* symlink */
NULL, /* mkdir */
NULL, /* rmdir */
NULL, /* mknod */
NULL, /* rename */
NULL, /* readlink */
NULL, /* readpage */
NULL, /* writepage */
NULL, /* bmap */
NULL, /* truncate */
NULL /* permission */
};
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