Commit | Line | Data |
---|---|---|
5ff67f98 DF |
1 | /* |
2 | * Copyright (c) 1983 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 | ||
7ab5124a | 7 | #ifndef lint |
17fe297f | 8 | static char sccsid[] = "@(#)if.c 5.2 (Berkeley) %G%"; |
5ff67f98 | 9 | #endif not lint |
7ab5124a SL |
10 | |
11 | /* | |
12 | * Routing Table Management Daemon | |
13 | */ | |
7fe7fe74 | 14 | #include "defs.h" |
7ab5124a SL |
15 | |
16 | extern struct interface *ifnet; | |
17 | ||
18 | /* | |
2d55efad | 19 | * Find the interface with address addr. |
7ab5124a SL |
20 | */ |
21 | struct interface * | |
22 | if_ifwithaddr(addr) | |
23 | struct sockaddr *addr; | |
24 | { | |
25 | register struct interface *ifp; | |
26 | ||
27 | #define same(a1, a2) \ | |
28 | (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0) | |
29 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
30 | if (ifp->int_flags & IFF_REMOTE) | |
31 | continue; | |
32 | if (ifp->int_addr.sa_family != addr->sa_family) | |
33 | continue; | |
34 | if (same(&ifp->int_addr, addr)) | |
35 | break; | |
36 | if ((ifp->int_flags & IFF_BROADCAST) && | |
37 | same(&ifp->int_broadaddr, addr)) | |
38 | break; | |
39 | } | |
40 | return (ifp); | |
41 | } | |
42 | ||
2d55efad MK |
43 | /* |
44 | * Find the point-to-point interface with destination address addr. | |
45 | */ | |
46 | struct interface * | |
47 | if_ifwithdstaddr(addr) | |
48 | struct sockaddr *addr; | |
49 | { | |
50 | register struct interface *ifp; | |
51 | ||
52 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
53 | if ((ifp->int_flags & IFF_POINTOPOINT) == 0) | |
54 | continue; | |
55 | if (same(&ifp->int_dstaddr, addr)) | |
56 | break; | |
57 | } | |
58 | return (ifp); | |
59 | } | |
60 | ||
7ab5124a SL |
61 | /* |
62 | * Find the interface on the network | |
63 | * of the specified address. | |
64 | */ | |
65 | struct interface * | |
66 | if_ifwithnet(addr) | |
67 | register struct sockaddr *addr; | |
68 | { | |
69 | register struct interface *ifp; | |
70 | register int af = addr->sa_family; | |
71 | register int (*netmatch)(); | |
72 | ||
17fe297f | 73 | if (af >= af_max) |
7ab5124a SL |
74 | return (0); |
75 | netmatch = afswitch[af].af_netmatch; | |
76 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
77 | if (ifp->int_flags & IFF_REMOTE) | |
78 | continue; | |
79 | if (af != ifp->int_addr.sa_family) | |
80 | continue; | |
81 | if ((*netmatch)(addr, &ifp->int_addr)) | |
82 | break; | |
83 | } | |
84 | return (ifp); | |
85 | } | |
86 | ||
87 | /* | |
88 | * Find an interface from which the specified address | |
89 | * should have come from. Used for figuring out which | |
90 | * interface a packet came in on -- for tracing. | |
91 | */ | |
92 | struct interface * | |
93 | if_iflookup(addr) | |
94 | struct sockaddr *addr; | |
95 | { | |
96 | register struct interface *ifp, *maybe; | |
97 | register int af = addr->sa_family; | |
98 | register int (*netmatch)(); | |
99 | ||
17fe297f | 100 | if (af >= af_max) |
7ab5124a SL |
101 | return (0); |
102 | maybe = 0; | |
103 | netmatch = afswitch[af].af_netmatch; | |
104 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
105 | if (ifp->int_addr.sa_family != af) | |
106 | continue; | |
107 | if (same(&ifp->int_addr, addr)) | |
108 | break; | |
109 | if ((ifp->int_flags & IFF_BROADCAST) && | |
110 | same(&ifp->int_broadaddr, addr)) | |
111 | break; | |
112 | if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr)) | |
113 | maybe = ifp; | |
114 | } | |
115 | if (ifp == 0) | |
116 | ifp = maybe; | |
117 | return (ifp); | |
118 | } |