| 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) %G% |
| 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 |