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5ff67f98 DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
0eb85d71 KB |
3 | * All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
b8c620d6 KB |
6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
5ff67f98 DF |
16 | */ |
17 | ||
7ab5124a | 18 | #ifndef lint |
b8c620d6 | 19 | static char sccsid[] = "@(#)if.c 5.5 (Berkeley) %G%"; |
0eb85d71 | 20 | #endif /* not lint */ |
7ab5124a SL |
21 | |
22 | /* | |
23 | * Routing Table Management Daemon | |
24 | */ | |
7fe7fe74 | 25 | #include "defs.h" |
7ab5124a SL |
26 | |
27 | extern struct interface *ifnet; | |
28 | ||
29 | /* | |
2d55efad | 30 | * Find the interface with address addr. |
7ab5124a SL |
31 | */ |
32 | struct interface * | |
33 | if_ifwithaddr(addr) | |
34 | struct sockaddr *addr; | |
35 | { | |
36 | register struct interface *ifp; | |
37 | ||
38 | #define same(a1, a2) \ | |
39 | (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0) | |
40 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
41 | if (ifp->int_flags & IFF_REMOTE) | |
42 | continue; | |
43 | if (ifp->int_addr.sa_family != addr->sa_family) | |
44 | continue; | |
45 | if (same(&ifp->int_addr, addr)) | |
46 | break; | |
47 | if ((ifp->int_flags & IFF_BROADCAST) && | |
48 | same(&ifp->int_broadaddr, addr)) | |
49 | break; | |
50 | } | |
51 | return (ifp); | |
52 | } | |
53 | ||
2d55efad MK |
54 | /* |
55 | * Find the point-to-point interface with destination address addr. | |
56 | */ | |
57 | struct interface * | |
58 | if_ifwithdstaddr(addr) | |
59 | struct sockaddr *addr; | |
60 | { | |
61 | register struct interface *ifp; | |
62 | ||
63 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
64 | if ((ifp->int_flags & IFF_POINTOPOINT) == 0) | |
65 | continue; | |
66 | if (same(&ifp->int_dstaddr, addr)) | |
67 | break; | |
68 | } | |
69 | return (ifp); | |
70 | } | |
71 | ||
7ab5124a SL |
72 | /* |
73 | * Find the interface on the network | |
74 | * of the specified address. | |
75 | */ | |
76 | struct interface * | |
77 | if_ifwithnet(addr) | |
78 | register struct sockaddr *addr; | |
79 | { | |
80 | register struct interface *ifp; | |
81 | register int af = addr->sa_family; | |
82 | register int (*netmatch)(); | |
83 | ||
17fe297f | 84 | if (af >= af_max) |
7ab5124a SL |
85 | return (0); |
86 | netmatch = afswitch[af].af_netmatch; | |
87 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
88 | if (ifp->int_flags & IFF_REMOTE) | |
89 | continue; | |
90 | if (af != ifp->int_addr.sa_family) | |
91 | continue; | |
92 | if ((*netmatch)(addr, &ifp->int_addr)) | |
93 | break; | |
94 | } | |
95 | return (ifp); | |
96 | } | |
97 | ||
98 | /* | |
99 | * Find an interface from which the specified address | |
100 | * should have come from. Used for figuring out which | |
101 | * interface a packet came in on -- for tracing. | |
102 | */ | |
103 | struct interface * | |
104 | if_iflookup(addr) | |
105 | struct sockaddr *addr; | |
106 | { | |
107 | register struct interface *ifp, *maybe; | |
108 | register int af = addr->sa_family; | |
109 | register int (*netmatch)(); | |
110 | ||
17fe297f | 111 | if (af >= af_max) |
7ab5124a SL |
112 | return (0); |
113 | maybe = 0; | |
114 | netmatch = afswitch[af].af_netmatch; | |
115 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
116 | if (ifp->int_addr.sa_family != af) | |
117 | continue; | |
118 | if (same(&ifp->int_addr, addr)) | |
119 | break; | |
120 | if ((ifp->int_flags & IFF_BROADCAST) && | |
121 | same(&ifp->int_broadaddr, addr)) | |
122 | break; | |
4fad5a6e MK |
123 | if ((ifp->int_flags & IFF_POINTOPOINT) && |
124 | same(&ifp->int_dstaddr, addr)) | |
125 | break; | |
7ab5124a SL |
126 | if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr)) |
127 | maybe = ifp; | |
128 | } | |
129 | if (ifp == 0) | |
130 | ifp = maybe; | |
131 | return (ifp); | |
132 | } |