Commit | Line | Data |
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6262939d | 1 | /* route.h 4.9 83/05/12 */ |
6c0a063b SL |
2 | |
3 | /* | |
a9f3e174 SL |
4 | * Kernel resident routing tables. |
5 | * | |
a13c006d BJ |
6 | * The routing tables are initialized at boot time by |
7 | * making entries for all directly connected interfaces. | |
8 | * Routing daemons can thereafter update the routing tables. | |
6c0a063b | 9 | * |
a9f3e174 SL |
10 | * TODO: |
11 | * keep statistics | |
6c0a063b | 12 | */ |
6c0a063b | 13 | |
a13c006d BJ |
14 | /* |
15 | * A route consists of a destination address and a reference | |
16 | * to a routing entry. These are often held by protocols | |
17 | * in their control blocks, e.g. inpcb. | |
18 | */ | |
6c0a063b SL |
19 | struct route { |
20 | struct rtentry *ro_rt; | |
21 | struct sockaddr ro_dst; | |
a13c006d BJ |
22 | #ifdef notdef |
23 | caddr_t ro_pcb; /* not used yet */ | |
24 | #endif | |
6c0a063b SL |
25 | }; |
26 | ||
27 | /* | |
a13c006d BJ |
28 | * We distinguish between routes to hosts and routes to networks, |
29 | * preferring the former if available. For each route we infer | |
30 | * the interface to use from the gateway address supplied when | |
31 | * the route was entered. Routes that forward packets through | |
32 | * gateways are marked so that the output routines know to address the | |
33 | * gateway rather than the ultimate destination. | |
6c0a063b | 34 | */ |
a13c006d BJ |
35 | struct rtentry { |
36 | u_long rt_hash; /* to speed lookups */ | |
37 | struct sockaddr rt_dst; /* key */ | |
38 | struct sockaddr rt_gateway; /* value */ | |
39 | short rt_flags; /* up/down?, host/net */ | |
40 | short rt_refcnt; /* # held references */ | |
41 | u_long rt_use; /* raw # packets forwarded */ | |
42 | struct ifnet *rt_ifp; /* the answer: interface to use */ | |
43 | }; | |
44 | #ifdef KERNEL | |
45 | #define RTHASHSIZ 7 | |
46 | struct mbuf *rthost[RTHASHSIZ]; | |
47 | struct mbuf *rtnet[RTHASHSIZ]; | |
48 | #endif | |
49 | ||
ee787340 | 50 | #define RTF_UP 0x1 /* route useable */ |
a13c006d | 51 | #define RTF_GATEWAY 0x2 /* destination is a gateway */ |
fc74f0c9 | 52 | #define RTF_HOST 0x4 /* host entry (net otherwise) */ |
6c0a063b | 53 | |
a9f3e174 SL |
54 | #define RTFREE(rt) \ |
55 | if ((rt)->rt_refcnt == 1) \ | |
56 | rtfree(rt); \ | |
57 | else \ | |
58 | (rt)->rt_refcnt--; |