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arp.h
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1990-11-10
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#ifndef _ARP_H
#define _ARP_H
#ifndef _GLOBAL_H
#include "global.h"
#endif
#ifndef _MBUF_H
#include "mbuf.h"
#endif
#ifndef _IFACE_H
#include "iface.h"
#endif
#ifndef _TIMER_H
#include "timer.h"
#endif
/* Size of ARP hash table */
#define ARPSIZE 17
/* Lifetime of a valid ARP entry */
#define ARPLIFE 900 /* 15 minutes */
/* Lifetime of a pending ARP entry */
#define PENDTIME 15 /* 15 seconds */
/* ARP definitions (see RFC 826) */
#define ARPLEN 16 /* Size of ARP hdr, minus hardware addresses */
/* Address size definitions */
#define IPALEN 4 /* Length in bytes of an IP address */
#define MAXHWALEN 255 /* Maximum length of a hardware address */
/* ARP opcodes */
#define ARP_REQUEST 1
#define ARP_REPLY 2
#define REVARP_REQUEST 3
#define REVARP_REPLY 4
/* Hardware types */
#define ARP_NETROM 0 /* Fake for NET/ROM (never actually sent) */
#define ARP_ETHER 1 /* Assigned to 10 megabit Ethernet */
#define ARP_EETHER 2 /* Assigned to experimental Ethernet */
#define ARP_AX25 3 /* Assigned to AX.25 Level 2 */
#define ARP_PRONET 4 /* Assigned to PROnet token ring */
#define ARP_CHAOS 5 /* Assigned to Chaosnet */
#define ARP_IEEE802 6 /* Who uses this? */
#define ARP_ARCNET 7
#define ARP_APPLETALK 8
extern char *Arptypes[]; /* Type fields in ASCII, defined in arpcmd */
#define NHWTYPES 9
/* Table of hardware types known to ARP */
struct arp_type {
int16 hwalen; /* Hardware length */
int16 iptype; /* Hardware type field for IP */
int16 arptype; /* Hardware type field for ARP */
int16 pendtime; /* # secs to wait pending response */
char *bdcst; /* Hardware broadcast address */
char *(*format) __ARGS((char *,char *));
/* Function that formats addresses */
int (*scan) __ARGS((char *,char *));
/* Reverse of format */
};
extern struct arp_type Arp_type[];
#define NULLATYPE (struct arp_type *)0
/* Format of an ARP request or reply packet. From p. 3 */
struct arp {
int16 hardware; /* Hardware type */
int16 protocol; /* Protocol type */
char hwalen; /* Hardware address length, bytes */
char pralen; /* Length of protocol address */
int16 opcode; /* ARP opcode (request/reply) */
char shwaddr[MAXHWALEN]; /* Sender hardware address field */
int32 sprotaddr; /* Sender Protocol address field */
char thwaddr[MAXHWALEN]; /* Target hardware address field */
int32 tprotaddr; /* Target protocol address field */
};
/* Format of ARP table */
struct arp_tab {
struct arp_tab *next; /* Doubly-linked list pointers */
struct arp_tab *prev;
struct timer timer; /* Time until aging this entry */
struct mbuf *pending; /* Queue of datagrams awaiting resolution */
int32 ip_addr; /* IP Address, host order */
int16 hardware; /* Hardware type */
char state; /* (In)complete */
#define ARP_PENDING 0
#define ARP_VALID 1
char pub; /* Respond to requests for this entry? */
char *hw_addr; /* Hardware address */
};
#define NULLARP (struct arp_tab *)0
extern struct arp_tab *Arp_tab[];
struct arp_stat {
unsigned recv; /* Total number of ARP packets received */
unsigned badtype; /* Incoming requests for unsupported hardware */
unsigned badlen; /* Incoming length field(s) didn't match types */
unsigned badaddr; /* Bogus incoming addresses */
unsigned inreq; /* Incoming requests for us */
unsigned replies; /* Replies sent */
unsigned outreq; /* Outoging requests sent */
};
extern struct arp_stat Arp_stat;
/* In arp.c: */
struct arp_tab *arp_add __ARGS((int32 ipaddr,int16 hardware,char *hw_addr,
int pub));
void arp_drop __ARGS((void *p));
int arp_init __ARGS((unsigned int hwtype,int hwalen,int iptype,int arptype,
int pendtime,char *bdcst,char *(*format) __ARGS((char *,char *)),
int (*scan) __ARGS((char *,char *)) ));
void arp_input __ARGS((struct iface *iface,struct mbuf *bp));
struct arp_tab *arp_lookup __ARGS((int16 hardware,int32 ipaddr));
char *res_arp __ARGS((struct iface *iface,int16 hardware,int32 target,struct mbuf *bp));
/* In arphdr.c: */
struct mbuf *htonarp __ARGS((struct arp *arp));
int ntoharp __ARGS((struct arp *arp,struct mbuf **bpp));
#endif /* _ARP_H */