iprtypes.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: 2001/09/24 11:25:36 $
*  $Source: M:/psisrc/routing/incl/rcs/iprtypes.h $
*  $Revision: 1.6 $
*************************************************************************
*  File Description: Definitions for IP forwarding database 
*************************************************************************/

/* metric types */
#define IPRT_INT	1	/*internal*/
#define IPRT_EXT	2	/*external*/

/* route preference. old style hard coded, 
   also used for softcoded initialization.
   Note: we must try to obey the maxim
   "never leak up" when redistributing routes
   from one domain into another. This prevents
   routing loops. Of course, user modified
   preference could mess this up, but that is
   user's concern. A first look, below preference
   would seem to be violated leaking ospf/etc
   routes into bgp. But this is not a problem 
   since bgp is path vector and bgp wont use
   any routes leaked into bgp by the local domain.
*/
#define IPRT_PREF_LOCAL		10
#define IPRT_PREF_STATIC		 9
#define IPRT_PREF_BGP		 8
#define IPRT_PREF_OSPF_INTRA	 7
#define IPRT_PREF_OSPF_INTER	 6
#define IPRT_PREF_OSPF_EXT	 4
#define IPRT_PREF_RIP		 4
#define IPRT_PREF_STATICLOW	 4
#define IPRT_PREF_ISIS		 4

/* owner of route (who put it in table), values with "X"
   denote dummies used for prefercne calc only
*/
#define IPRT_ISIS	1
#define IPRT_RIP	2
#define IPRT_OSPF	3
#define IPRT_STATIC	4
#define IPRT_LOCAL	5
#define IPRT_BGP	6
#define IPRT_STATICLOW 7
#define XIPRT_OSPF_INTER 8
#define XIPRT_OSPF_EXT   9
#define IPRT_MAXTYPE     9

/* must be same order as above */
#define IPRT_DEF_PREF               {         \
0,                     \
IPRT_PREF_ISIS,        \
IPRT_PREF_RIP,         \
IPRT_PREF_OSPF_INTRA,  \
IPRT_PREF_STATIC,      \
IPRT_PREF_LOCAL,       \
IPRT_PREF_BGP,         \
IPRT_PREF_STATICLOW,   \
IPRT_PREF_OSPF_INTER,  \
IPRT_PREF_OSPF_EXT     \
}

#define RTIP_PREF(xpref,xown,xlvl)  {         \
  int xindex;                                 \
  if(xown != IPRT_OSPF || (xlvl == 1)){       \
	xindex = xown;                           \
  }                                           \
  else{                                       \
	xindex = IPRT_STATICLOW + xlvl -1;       \
  }                                           \
  xpref = i_node->rn_rtprefs[xindex];         \
}

/* same as above, but doesnt complain 
   about code unreachable,not usable by ospf
*/
#define RTIP_NLPREF(xpref,xown)  	 {         \
  int xindex;                                 \
  xindex = xown;  		                     \
  xpref = i_node->rn_rtprefs[xindex];         \
}

/* cross protocol tags defined by rfc 1745 */
/* igp originates, admin says its ext rt */
#define RTTAG_NCMP_0	0x80000000

/* egp originates into ospf or bgp learns rt with org = egp 
   and rt has no transitive attributes */
#define RTTAG_NCMP_1	0x90000000

/* bgp learns, exports to stub ospf domain */
#define RTTAG_NCMP_2	0xa0000000

/* igp (eg rip) imports to ospf */
#define RTTAG_CMP_0		0xc0000000

/* bgp learns from 1 as hop away, if admin chooses this
   method
*/
#define RTTAG_CMP_1		0xd0000000

/* general case bgp learns */
#define RTTAG_CMP_2		0xe0000000

/* tag type field */
#define RTTAG_TYPE		0xf0000000

/* as num tag field */
#define RTTAG_AS		0x0000ffff

/* arbitrary tag field */
#define RTTAG_ARB		0x0fff0000

/* Error codes for API functions.  Not directly
   using Fusion error codes to allow the code to
   be used for non-Fusion platforms without too much
   grief.
*/

#define RR_ERR			-1 /* Returned from API calls */
#define RR_NOERR		0  /* Returned for no error */
/* Error codes go into the errp argument */
#define RR_ERR_INVAL	0x80
#define RR_ERR_ALREADY	0x81