arp.h

An implementation of the TCP/IP protocol suite for the LINUX operating system. INET is implemented u

  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  *              Definitions for the ARP protocol module.
  7  *
  8  * Version:     @(#)arp.h       1.0.6   05/21/93
  9  *
 10  * Authors:     Ross Biro, <[e-mail]>
 11  *              Fred N. van Kempen, <[e-mail]>
 12  *
 13  *              This program is free software; you can redistribute it and/or
 14  *              modify it under the terms of the GNU General Public License
 15  *              as published by the Free Software Foundation; either version
 16  *              2 of the License, or (at your option) any later version.
 17  */
 18 #ifndef _ARP_H
 19 #define _ARP_H
 20 
 21 #define ARP_TABLE_SIZE  16              /* size of ARP table            */
 22 #define ARP_TIMEOUT     30000           /* five minutes                 */
 23 #define ARP_RES_TIME    250             /* 2.5 seconds                  */
 24 
 25 #define ARP_MAX_TRIES   3               /* max # of tries to send ARP   */
 26 #define ARP_QUEUE_MAGIC 0x0432447A      /* magic # for queues           */
 27 
 28 
 29 /* This structure defines the ARP mapping cache. */
 30 struct arp_table {
 31   struct arp_table              *next;
 32   volatile unsigned long        last_used;
 33   unsigned int                  flags;
 34 #if 1
 35   unsigned long                 ip;
 36 #else
 37   unsigned char                 pa[MAX_ADDR_LEN];
 38   unsigned char                 plen;
 39   unsigned char                 ptype;
 40 #endif
 41   unsigned char                 ha[MAX_ADDR_LEN];
 42   unsigned char                 hlen;
 43   unsigned char                 htype;
 44 };
 45 
 46 
 47 /* This is also used in "sock.c" and "tcp.c" - YUCK! - FvK */
 48 extern struct sk_buff *arp_q;
 49 
 50 
 51 extern void     arp_destroy(unsigned long paddr);
 52 extern int      arp_rcv(struct sk_buff *skb, struct device *dev,
 53                         struct packet_type *pt);
 54 extern int      arp_find(unsigned char *haddr, unsigned long paddr,
 55                          struct device *dev, unsigned long saddr);
 56 extern void     arp_add(unsigned long addr, unsigned char *haddr,
 57                         struct device *dev);
 58 extern void     arp_add_broad(unsigned long addr, struct device *dev);
 59 extern void     arp_queue(struct sk_buff *skb);
 60 extern int      arp_get_info(char *buffer);
 61 extern int      arp_ioctl(unsigned int cmd, void *arg);
 62 extern void     arp_destroy_maybe(unsigned long paddr);
 63 
 64 #endif  /* _ARP_H */
 65