LXR linux-old/net/ipv4/utils.c

   1/*
   2 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3 *              operating system.  INET is implemented using the  BSD Socket
   4 *              interface as the means of communication with the user level.
   5 *
   6 *              Various kernel-resident INET utility functions; mainly
   7 *              for format conversion and debugging output.
   8 *
   9 * Version:     $Id: utils.c,v 1.6 1997/12/13 21:53:03 kuznet Exp $
  10 *
  11 * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12 *
  13 * Fixes:
  14 *              Alan Cox        :       verify_area check.
  15 *              Alan Cox        :       removed old debugging.
  16 *              Andi Kleen      :       add net_ratelimit()  
  17 *
  18 *              This program is free software; you can redistribute it and/or
  19 *              modify it under the terms of the GNU General Public License
  20 *              as published by the Free Software Foundation; either version
  21 *              2 of the License, or (at your option) any later version.
  22 */
  23
  24#include <asm/uaccess.h>
  25#include <asm/system.h>
  26#include <linux/types.h>
  27#include <linux/kernel.h>
  28#include <linux/sched.h>
  29#include <linux/string.h>
  30#include <linux/mm.h>
  31#include <linux/socket.h>
  32#include <linux/in.h>
  33#include <linux/errno.h>
  34#include <linux/stat.h>
  35#include <stdarg.h>
  36#include <linux/inet.h>
  37#include <linux/netdevice.h>
  38#include <linux/etherdevice.h>
  39#include <net/ip.h>
  40#include <net/protocol.h>
  41#include <net/tcp.h>
  42#include <linux/skbuff.h>
  43
  44
  45/*
  46 *      Display an IP address in readable format. 
  47 */
  48 
  49char *in_ntoa(__u32 in)
  50{
  51        static char buff[18];
  52        char *p;
  53
  54        p = (char *) &in;
  55        sprintf(buff, "%d.%d.%d.%d",
  56                (p[0] & 255), (p[1] & 255), (p[2] & 255), (p[3] & 255));
  57        return(buff);
  58}
  59
  60
  61/*
  62 *      Convert an ASCII string to binary IP. 
  63 */
  64 
  65__u32 in_aton(const char *str)
  66{
  67        unsigned long l;
  68        unsigned int val;
  69        int i;
  70
  71        l = 0;
  72        for (i = 0; i < 4; i++) 
  73        {
  74                l <<= 8;
  75                if (*str != '\0') 
  76                {
  77                        val = 0;
  78                        while (*str != '\0' && *str != '.') 
  79                        {
  80                                val *= 10;
  81                                val += *str - '0';
  82                                str++;
  83                        }
  84                        l |= val;
  85                        if (*str != '\0') 
  86                                str++;
  87                }
  88        }
  89        return(htonl(l));
  90}
  91
  92