route.h

Variables

rthost            X
rtnet             X
rtstat            X

Macros

RTFREE            X
RTF_DYNAMIC       X
RTF_GATEWAY       X
RTF_HOST          X
RTF_UP            X
RTHASHMOD         X
RTHASHSIZ         X

struct's

route             X
rtentry           X
rtstat            X

   1: /*
   2:  * Copyright (c) 1980, 1986 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  *
   6:  *	@(#)route.h	7.1 (Berkeley) 6/4/86
   7:  */
   8: 
   9: /*
  10:  * Kernel resident routing tables.
  11:  *
  12:  * The routing tables are initialized when interface addresses
  13:  * are set by making entries for all directly connected interfaces.
  14:  */
  15: 
  16: /*
  17:  * A route consists of a destination address and a reference
  18:  * to a routing entry.  These are often held by protocols
  19:  * in their control blocks, e.g. inpcb.
  20:  */
  21: struct route {
  22:     struct  rtentry *ro_rt;
  23:     struct  sockaddr ro_dst;
  24: };
  25: 
  26: /*
  27:  * We distinguish between routes to hosts and routes to networks,
  28:  * preferring the former if available.  For each route we infer
  29:  * the interface to use from the gateway address supplied when
  30:  * the route was entered.  Routes that forward packets through
  31:  * gateways are marked so that the output routines know to address the
  32:  * gateway rather than the ultimate destination.
  33:  */
  34: struct rtentry {
  35:     u_long  rt_hash;        /* to speed lookups */
  36:     struct  sockaddr rt_dst;    /* key */
  37:     struct  sockaddr rt_gateway;    /* value */
  38:     short   rt_flags;       /* up/down?, host/net */
  39:     short   rt_refcnt;      /* # held references */
  40:     u_long  rt_use;         /* raw # packets forwarded */
  41:     struct  ifnet *rt_ifp;      /* the answer: interface to use */
  42: };
  43: 
  44: #define RTF_UP      0x1     /* route useable */
  45: #define RTF_GATEWAY 0x2     /* destination is a gateway */
  46: #define RTF_HOST    0x4     /* host entry (net otherwise) */
  47: #define RTF_DYNAMIC 0x10        /* created dynamically (by redirect) */
  48: 
  49: /*
  50:  * Routing statistics.
  51:  */
  52: struct  rtstat {
  53:     short   rts_badredirect;    /* bogus redirect calls */
  54:     short   rts_dynamic;        /* routes created by redirects */
  55:     short   rts_newgateway;     /* routes modified by redirects */
  56:     short   rts_unreach;        /* lookups which failed */
  57:     short   rts_wildcard;       /* lookups satisfied by a wildcard */
  58: };
  59: 
  60: #ifdef KERNEL
  61: #define RTFREE(rt) \
  62:     if ((rt)->rt_refcnt == 1) \
  63:         rtfree(rt); \
  64:     else \
  65:         (rt)->rt_refcnt--;
  66: 
  67: #ifdef  GATEWAY
  68: #define RTHASHSIZ   64
  69: #else
  70: #define RTHASHSIZ   8
  71: #endif
  72: #if (RTHASHSIZ & (RTHASHSIZ - 1)) == 0
  73: #define RTHASHMOD(h)    ((h) & (RTHASHSIZ - 1))
  74: #else
  75: #define RTHASHMOD(h)    ((h) % RTHASHSIZ)
  76: #endif
  77: struct  mbuf *rthost[RTHASHSIZ];
  78: struct  mbuf *rtnet[RTHASHSIZ];
  79: struct  rtstat  rtstat;
  80: #endif