rrsnadd.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: 2001/09/10 16:23:22 $
*  $Source: M:/psisrc/routing/incl/rcs/rrsnadd.h $
*  $Revision: 1.4 $
*************************************************************************
*  File Description: subnetwork address and llc definitions  
*************************************************************************/
#ifndef _snadd_h
#define _snadd_h

/* llc stuff */
struct lan_addr{
    byte	addr[6];
};

#define MAX_SNPA_LEN  12

typedef struct sn_addr{
    byte  s_type;
    byte  s_len;
    union {
		struct 	lan_addr	ea;
		byte	x121[8];
		byte	e164[9];
		byte ipa[8];			/* 2 IP addrs */
		byte	gen[MAX_SNPA_LEN];
    }s_addr;
}SNAD, *snad_pt;

/* types */
#define SN_UNKNOWN	0
#define SN_LAN		1	/* 802 type */
#define SN_PTPT		2 
#define SN_X121		3
#define SN_E164		4
#define SN_GENERIC	5
#define SN_MC		6
#define SN_GREIP	7		/* GRE encap in IP */
#define SN_IPTUNNEL	8		/* security encapsulation */
#define SN_DLCI     9
#define SN_VPI      10
#define SN_NSAP	11


/* secure tunnel source and destination */
#define secure_src(xsnad)	XIPA(&((xsnad)->s_addr.ipa[0]))
#define secure_dst(xsnad)	XIPA(&((xsnad)->s_addr.ipa[4]))

/* generic router encapsulation header */
#define IP_PROT_GRE	 47
#define GRE_PROT_OSI 0x00fe
#define GRE_HDR_LEN 4
typedef struct gre_header{
	byte		flver1;		/* flags/version */
	byte		flver0;
	byte		ptype1;		/* protocol type */
	byte		ptype0;
}GRE_HDR, *gre_hdr_pt;

#define GRE_CP		0x80		/* csum present */
#define GRE_RP		0x40		/* routing present */
#define GRE_KP		0x20		/* key present */
#define GRE_SP		0x10		/* seq # present */
#define GRE_SRT	0x80		/* source routed */	

/* used to locate incoming GRE circuit 
   from source IP address. */
typedef struct ipdest_search{
	struct ipdest_search	*ipd_fwd;		/* links */
	struct ipdest_search	*ipd_bwd;		/* links */
	byte					 ipd_ipa[4];	/* ip source */
	int					 ipd_cid;		/* neigh circ*/
}IPDSRCH, *ipdsrch_pt;


typedef struct eth_llc_hdr{
    byte		llc_da[6];
    byte		llc_sa[6];
    word		llc_len;
    byte		llc_dsap;
    byte		llc_ssap;
    byte		llc_cntl;
}ETHLLC,*eth_llc_pt;

typedef struct llc_hdr{
    byte		llc_da[6];
    byte		llc_sa[6];
    byte		llc_dsap;
    byte		llc_ssap;
    byte		llc_cntl;
}LLC,*llc_pt;

typedef struct eth_hdr{
    byte		eth_da[6];
    byte		eth_sa[6];
    word		eth_type;
}ETH,*eth_pt;

typedef struct eth_snap_hdr{
    byte		llc_da[6];
    byte		llc_sa[6];
    word		llc_len;
    byte		llc_dsap;
    byte		llc_ssap;
    byte		llc_cntl;
    byte		llc_snap[5];
}ETHSNAP,*eth_snap_pt;

typedef struct snap_hdr{
    byte		llc_da[6];
    byte		llc_sa[6];
    byte		llc_dsap;
    byte		llc_ssap;
    byte		llc_cntl;
    byte		llc_snap[5];
}SNAP,*snap_pt;


/* whether or not to delete output frame after tx */
#define NODELETE 0
#define DELETE	 1

/* mac encapsulation type */
#define ENCAP_DIX	0		/* type */
#define ENCAP_RAW	1		/* len only */
#define ENCAP_LLC	2		/* len,llc */
#define ENCAP_SNAP	3		/* snap hdr */
#define NUM_ENCAP   4
#endif