arp.h

用于嵌入式系统的TCP/IP协议栈及若干服务

/*
*            Copyright (c) 1998-2001 by NETsilicon Inc.
*
*  This software is copyrighted by and is the sole property of
*  NETsilicon.  All rights, title, ownership, or other interests
*  in the software remain the property of NETsilicon.  This
*  software may only be used in accordance with the corresponding
*  license agreement.  Any unauthorized use, duplication, transmission,
*  distribution, or disclosure of this software is expressly forbidden.
*
*  This Copyright notice may not be removed or modified without prior
*  written consent of NETsilicon.
*
*  NETsilicon, reserves the right to modify this software
*  without notice.
*
*  NETsilicon
*  411 Waverley Oaks Road                  USA 781.647.1234
*  Suite 227                               http://www.netsilicon.com
*  Waltham, MA 02452                       [e-mail]
*
*************************************************************************
*  $Name: Fusion 6.52 Fusion 6.51 $
*  $Date: 2001/09/20 10:19:16 $
*  $Source: M:/psisrc/stack/incl/rcs/arp.h $
*  $Revision: 1.12 $
**************************************************************************
*  File Description:  Address Resolution Protocol definitions             *
**************************************************************************/

#ifndef _ARP_
#define _ARP_

#include "config.h"
#include "ccdep.h"
#include "socket.h"

#ifndef LOCK_ARP_CACHE      /* ARP cache lock macro */
#define LOCK_ARP_CACHE
#endif

#ifndef UNLOCK_ARP_CACHE    /* ARP cache unlock macro */
#define UNLOCK_ARP_CACHE
#endif

#ifndef ARP_CACHE_LOCKER    /* local variable ? for lock/unlock macros */
#define ARP_CACHE_LOCKER
#endif

/* Flags from proxy entries in arp cache */
#define ARP_PERM_ENTRY          1
#define ARP_PROXY_ENTRY         2
#define ARP_SPROXY_ENTRY        3
#define ARP_MULTI_ENTRY        	4
#define ARP_REGULAR             5


/* Arp Link Layer Types (Not to be confused with link layer protocol types) */
#define ARP_UNSPEC      0       /* (defined by us) */
#define ARP_EN          1       /* Ethernet (defined by D.C.P.) */
#define ARP_LLC         6       /* 802.2 LLC (defined by RFC 1188) */
#define ARP_TR          6       /* Token Ring RFC-1010 pg 16 IEEE 802.x */

#define ARP_XLL         3       /* External Link Layer (defined by us) */
#define ARP_PN          4       /* Pronet */

/* Opcodes */

#define ARP_REQUEST     0x1
#define ARP_REPLY       0x2
#define RARP_REQUEST    0x3
#define RARP_REPLY      0x4

typedef u8 ARP_T;

#define AR_LTYPE        0                 /* 2 bytes */
#define AR_PTYPE        (AR_LTYPE+2)      /* 2 bytes */
#define AR_LLEN         (AR_PTYPE+2)      /* 1 byte */
#define AR_PLEN         (AR_LLEN+1)       /* 1 byte */
#define AR_OPCODE       (AR_PLEN+1)       /* 2 bytes */
/* variable length addresses */
/*      link layer source address (ar_llen) */
/*      protocol source address (ar_plen) */
/*      link layer destination address (ar_llen) */
/*      protocol destination address (ar_plen) */
#define SIZEOF_ARP_T    (AR_OPCODE+2)

#define LINK_SRC_ADDR(arp)      ((char *)&arp[SIZEOF_ARP_T])
#define PROTO_SRC_ADDR(arp)     (LINK_SRC_ADDR(arp) + (arp[AR_LLEN] & 0xFF))
#define LINK_DEST_ADDR(arp)     (PROTO_SRC_ADDR(arp) + (arp[AR_PLEN] & 0xFF))
#define PROTO_DEST_ADDR(arp)    (LINK_DEST_ADDR(arp) + (arp[AR_LLEN] & 0xFF))



/* address resolution cache */
typedef struct {
	so_addr c_protoaddr;
	so_addr c_linkaddr;
	u16     c_countdown;
	u16     c_af;
	u16     c_flags;
    u16     c_ifIndex; /* Index of interface corresonding to this ARP cache
                          entry.
                       */
} cache_t;



/* Reverse address resolution cache structure*/

#define SPARP_ENTRY             0       /* Subnet Proxy entry */
#define PARP_ENTRY              1       /* Proxy ARP entry */ 
#define KARP_ENTRY              2       /* Forced ARP perm. entry */    
#define RARP_ENTRY              3       /* Reverse ARP entry */
#define GET_RARP_MEM_CMD        4       /* Allocate memory */
#define GET_ARP_MEM_CMD         5       /* Allocate memory */

typedef struct  {
	so_addr         proto_addr;
	so_addr         ll_addr;
} RCH;

/* cache structure */
typedef struct rcel {
	struct rcel     * next;
	int             cmd;
	int             cnt;
	short           type;
	short           pad;
	RCH             c;
} RC_EL;    /* RARP Cache Element */

#endif  /*_ARP_*/