Commit | Line | Data |
---|---|---|
edd60ffc KB |
1 | /* |
2 | * Copyright (c) 1983 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
6ecf3d85 | 5 | * %sccs.include.redist.c% |
edd60ffc KB |
6 | * |
7 | * static char sccsid[] = "@(#)if.c 5.1 (Berkeley) 6/4/85"; (routed/if.c) | |
8 | */ | |
9 | ||
10 | #ifndef lint | |
6ecf3d85 | 11 | static char sccsid[] = "@(#)if.c 5.2 (Berkeley) %G%"; |
edd60ffc KB |
12 | #endif /* not lint */ |
13 | ||
14 | /* | |
15 | * Routing Table Management Daemon | |
16 | */ | |
17 | #include "defs.h" | |
18 | ||
19 | extern struct interface *ifnet; | |
20 | ||
21 | /* | |
22 | * Find the interface with address addr. | |
23 | */ | |
24 | struct interface * | |
25 | if_ifwithaddr(addr) | |
26 | struct sockaddr *addr; | |
27 | { | |
28 | register struct interface *ifp; | |
29 | ||
30 | #define same(a1, a2) \ | |
31 | (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0) | |
32 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
33 | if (ifp->int_flags & IFF_REMOTE) | |
34 | continue; | |
35 | if (ifp->int_addr.sa_family != addr->sa_family) | |
36 | continue; | |
37 | if (same(&ifp->int_addr, addr)) | |
38 | break; | |
39 | if ((ifp->int_flags & IFF_BROADCAST) && | |
40 | same(&ifp->int_broadaddr, addr)) | |
41 | break; | |
42 | } | |
43 | return (ifp); | |
44 | } | |
45 | ||
46 | /* | |
47 | * Find the point-to-point interface with destination address addr. | |
48 | */ | |
49 | struct interface * | |
50 | if_ifwithdstaddr(addr) | |
51 | struct sockaddr *addr; | |
52 | { | |
53 | register struct interface *ifp; | |
54 | ||
55 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
56 | if ((ifp->int_flags & IFF_POINTOPOINT) == 0) | |
57 | continue; | |
58 | if (same(&ifp->int_dstaddr, addr)) | |
59 | break; | |
60 | } | |
61 | return (ifp); | |
62 | } | |
63 | ||
64 | /* | |
65 | * Find the interface on the network | |
66 | * of the specified address. | |
67 | */ | |
68 | struct interface * | |
69 | if_ifwithnet(addr) | |
70 | register struct sockaddr *addr; | |
71 | { | |
72 | register struct interface *ifp; | |
73 | register int af = addr->sa_family; | |
74 | register int (*netmatch)(); | |
75 | ||
76 | if (af >= AF_MAX) | |
77 | return (0); | |
78 | netmatch = afswitch[af].af_netmatch; | |
79 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
80 | if (ifp->int_flags & IFF_REMOTE) | |
81 | continue; | |
82 | if (af != ifp->int_addr.sa_family) | |
83 | continue; | |
84 | if ((*netmatch)(addr, &ifp->int_addr)) | |
85 | break; | |
86 | } | |
87 | return (ifp); | |
88 | } | |
89 | ||
90 | /* | |
91 | * Find an interface from which the specified address | |
92 | * should have come from. Used for figuring out which | |
93 | * interface a packet came in on -- for tracing. | |
94 | */ | |
95 | struct interface * | |
96 | if_iflookup(addr) | |
97 | struct sockaddr *addr; | |
98 | { | |
99 | register struct interface *ifp, *maybe; | |
100 | register int af = addr->sa_family; | |
101 | register int (*netmatch)(); | |
102 | ||
103 | if (af >= AF_MAX) | |
104 | return (0); | |
105 | maybe = 0; | |
106 | netmatch = afswitch[af].af_netmatch; | |
107 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
108 | if (ifp->int_addr.sa_family != af) | |
109 | continue; | |
110 | if (same(&ifp->int_addr, addr)) | |
111 | break; | |
112 | if ((ifp->int_flags & IFF_BROADCAST) && | |
113 | same(&ifp->int_broadaddr, addr)) | |
114 | break; | |
115 | if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr)) | |
116 | maybe = ifp; | |
117 | } | |
118 | if (ifp == 0) | |
119 | ifp = maybe; | |
120 | return (ifp); | |
121 | } |