1 /* route.h 6.3 84/08/29 */ 2 3 /* 4 * Kernel resident routing tables. 5 * 6 * The routing tables are initialized at boot time by 7 * making entries for all directly connected interfaces. 8 */ 9 10 /* 11 * A route consists of a destination address and a reference 12 * to a routing entry. These are often held by protocols 13 * in their control blocks, e.g. inpcb. 14 */ 15 struct route { 16 struct rtentry *ro_rt; 17 struct sockaddr ro_dst; 18 #ifdef notdef 19 caddr_t ro_pcb; /* not used yet */ 20 #endif 21 }; 22 23 /* 24 * We distinguish between routes to hosts and routes to networks, 25 * preferring the former if available. For each route we infer 26 * the interface to use from the gateway address supplied when 27 * the route was entered. Routes that forward packets through 28 * gateways are marked so that the output routines know to address the 29 * gateway rather than the ultimate destination. 30 */ 31 struct rtentry { 32 u_long rt_hash; /* to speed lookups */ 33 struct sockaddr rt_dst; /* key */ 34 struct sockaddr rt_gateway; /* value */ 35 short rt_flags; /* up/down?, host/net */ 36 short rt_refcnt; /* # held references */ 37 u_long rt_use; /* raw # packets forwarded */ 38 struct ifnet *rt_ifp; /* the answer: interface to use */ 39 }; 40 41 #define RTF_UP 0x1 /* route useable */ 42 #define RTF_GATEWAY 0x2 /* destination is a gateway */ 43 #define RTF_HOST 0x4 /* host entry (net otherwise) */ 44 45 /* 46 * Routing statistics. 47 */ 48 struct rtstat { 49 short rts_badredirect; /* bogus redirect calls */ 50 short rts_dynamic; /* routes created by redirects */ 51 short rts_newgateway; /* routes modified by redirects */ 52 short rts_unreach; /* lookups which failed */ 53 short rts_wildcard; /* lookups satisfied by a wildcard */ 54 }; 55 56 #ifdef KERNEL 57 #define RTFREE(rt) \ 58 if ((rt)->rt_refcnt == 1) \ 59 rtfree(rt); \ 60 else \ 61 (rt)->rt_refcnt--; 62 63 #ifdef GATEWAY 64 #define RTHASHSIZ 64 65 #else 66 #define RTHASHSIZ 8 67 #endif 68 #if (RTHASHSIZ & (RTHASHSIZ - 1)) == 0 69 #define RTHASHMOD(h) ((h) & (RTHASHSIZ - 1)) 70 #else 71 #define RTHASHMOD(h) ((h) % RTHASHSIZ) 72 #endif 73 struct mbuf *rthost[RTHASHSIZ]; 74 struct mbuf *rtnet[RTHASHSIZ]; 75 struct rtstat rtstat; 76 #endif 77