icmp.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: 2002/01/03 17:40:45 $
*  $Source: M:/psisrc/stack/incl/rcs/icmp.h $
*  $Revision: 1.10 $
**************************************************************************
*  File Description:  ICMP (Internet Control Message Protocol) defines
*
**************************************************************************/

#ifndef _ICMP_
#define _ICMP_

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

/* ICMP fixed header */
typedef u8 ICMP_T;

#define ICMP_TYPE       0                     /* message type, 1 byte */
#define ICMP_CODE       (ICMP_TYPE + 1)       /* error code, 1 byte */
#define ICMP_CHECKSUM   (ICMP_CODE + 1)       /* checksum, 2 bytes */

/* The next 32 bits of the ICMP header depend on the message type */
#define ICMP_UNUSED     (ICMP_CHECKSUM + 2)   /* area may be unused, 4 bytes */
#define SIZEOF_ICMP_T   (ICMP_UNUSED + 4)     /* size of ICMP header */

/* Parameter Problem Message */
#define ICMP_POINTER    ICMP_UNUSED         /* 1 byte */

/* Redirect Message */
#define ICMP_RM         ICMP_UNUSED         /* 4 bytes */

#define ICMP_GIA        ICMP_UNUSED         /* 4 bytes */

/* Timestamp/Echo, Timestamp/Echo Reply,
    Address Mask, or Address Mask Reply Message */
#define ICMP_ID         ICMP_UNUSED           /* Identifier, 2 bytes */
#define ICMP_SN         (ICMP_ID+2)           /* Sequence Number, 2 bytes */

/* Destination unreachable, needs fragmentation */
#define ICMP_NXTMTU		(ICMP_UNUSED+2)		  /* For DUR with DF - MTU of next hop */


/* ICMP type values */

#define ICMP_DUR    3   /* destination unreachable message */
#define ICMP_TE     11  /* time exceeded message */
#define ICMP_PP     12  /* parameter problem message */
#define ICMP_SQ     4   /* source quench message */
#define ICMP_RED    5   /* redirect message */
#define ICMP_ECH    8   /* echo message */
#define ICMP_ECR    0   /* echo reply message */
#define ICMP_TIM    13  /* timestamp message */
#define ICMP_TMR    14  /* timestamp reply */
#define ICMP_IN     15  /* information request */
#define ICMP_INR    16  /* information reply */
#define ICMP_AM     17  /* address mask request */
#define ICMP_AMR    18  /* address mask reply */
#define ICMP_RTRDISC_ADV 9	/* router discovery advertisement */
#define ICMP_RTRDISC_REQ 10	/* router discovery solicitation */

/* Router Discovery constants */
#define ICMP_RDISC_PREF 0	/* preference value */
#define ICMP_RDISC_ADV_INT  600 /* advertize every 10 minutes */

/* ICMP code values */

#define DUR_NET         0   /* network unreachable */
#define DUR_HOST        1   /* host unreachable */
#define DUR_PROTO       2   /* protocol unreachable */
#define DUR_PORT        3   /* port unreachable */
#define DUR_FRAG        4   /* fragmentation needed & DF set */
#define DUR_ROUTE       5   /* source route failed */
#define TE_TRANSIT      0   /* time to live exceeded in transit */
#define TE_REASSEMBLY   1   /* fragment reassembly time exceeded */
#define PP_PERR         0   /* pointer indicates the error */
#define RED_NET         0   /* redirect datagrams for the network */
#define RED_HOST        1   /* redirect datagrams for the host */
#define RED_NTOS        2   /* redirect datagrams for the tos & network */
#define RED_HTOS        3   /* redirect datagrams for the tos & host */



#define ICMP_PSIZE      2048
#define icmp_er(mp, type, code, x, y) ((mp)->m_p0 = (type), (mp)->m_p1 = (code), (mp)->m_p2 = (x), (mp)->m_p3 = (y), icmp_msg)

#ifndef ICMP_RQ_MAX
#define ICMP_RQ_MAX	    4096
#endif

#ifndef ICMP_SQ_MAX
#define ICMP_SQ_MAX	    4096
#endif

#define PING_MAXPLEN	min(ICMP_RQ_MAX,ICMP_SQ_MAX) /* Maximum PING packet len */
#define PING_DEFPLEN	56	/* Default PING packet len 64 - sizeof(icmp_t) */
#define PING_NPACKETS	1	/* Default PING number of packets to transmit */

#endif /* _ICMP_ */