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1 | /* |
2 | * Copyright (c) 1983 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
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. | |
16 | * | |
17 | * static char sccsid[] = "@(#)if.c 5.1 (Berkeley) 6/4/85"; (routed/if.c) | |
18 | */ | |
19 | ||
20 | #ifndef lint | |
21 | static char sccsid[] = "@(#)if.c 5.1 (Berkeley) %G%"; | |
22 | #endif /* not lint */ | |
23 | ||
24 | /* | |
25 | * Routing Table Management Daemon | |
26 | */ | |
27 | #include "defs.h" | |
28 | ||
29 | extern struct interface *ifnet; | |
30 | ||
31 | /* | |
32 | * Find the interface with address addr. | |
33 | */ | |
34 | struct interface * | |
35 | if_ifwithaddr(addr) | |
36 | struct sockaddr *addr; | |
37 | { | |
38 | register struct interface *ifp; | |
39 | ||
40 | #define same(a1, a2) \ | |
41 | (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0) | |
42 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
43 | if (ifp->int_flags & IFF_REMOTE) | |
44 | continue; | |
45 | if (ifp->int_addr.sa_family != addr->sa_family) | |
46 | continue; | |
47 | if (same(&ifp->int_addr, addr)) | |
48 | break; | |
49 | if ((ifp->int_flags & IFF_BROADCAST) && | |
50 | same(&ifp->int_broadaddr, addr)) | |
51 | break; | |
52 | } | |
53 | return (ifp); | |
54 | } | |
55 | ||
56 | /* | |
57 | * Find the point-to-point interface with destination address addr. | |
58 | */ | |
59 | struct interface * | |
60 | if_ifwithdstaddr(addr) | |
61 | struct sockaddr *addr; | |
62 | { | |
63 | register struct interface *ifp; | |
64 | ||
65 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
66 | if ((ifp->int_flags & IFF_POINTOPOINT) == 0) | |
67 | continue; | |
68 | if (same(&ifp->int_dstaddr, addr)) | |
69 | break; | |
70 | } | |
71 | return (ifp); | |
72 | } | |
73 | ||
74 | /* | |
75 | * Find the interface on the network | |
76 | * of the specified address. | |
77 | */ | |
78 | struct interface * | |
79 | if_ifwithnet(addr) | |
80 | register struct sockaddr *addr; | |
81 | { | |
82 | register struct interface *ifp; | |
83 | register int af = addr->sa_family; | |
84 | register int (*netmatch)(); | |
85 | ||
86 | if (af >= AF_MAX) | |
87 | return (0); | |
88 | netmatch = afswitch[af].af_netmatch; | |
89 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
90 | if (ifp->int_flags & IFF_REMOTE) | |
91 | continue; | |
92 | if (af != ifp->int_addr.sa_family) | |
93 | continue; | |
94 | if ((*netmatch)(addr, &ifp->int_addr)) | |
95 | break; | |
96 | } | |
97 | return (ifp); | |
98 | } | |
99 | ||
100 | /* | |
101 | * Find an interface from which the specified address | |
102 | * should have come from. Used for figuring out which | |
103 | * interface a packet came in on -- for tracing. | |
104 | */ | |
105 | struct interface * | |
106 | if_iflookup(addr) | |
107 | struct sockaddr *addr; | |
108 | { | |
109 | register struct interface *ifp, *maybe; | |
110 | register int af = addr->sa_family; | |
111 | register int (*netmatch)(); | |
112 | ||
113 | if (af >= AF_MAX) | |
114 | return (0); | |
115 | maybe = 0; | |
116 | netmatch = afswitch[af].af_netmatch; | |
117 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
118 | if (ifp->int_addr.sa_family != af) | |
119 | continue; | |
120 | if (same(&ifp->int_addr, addr)) | |
121 | break; | |
122 | if ((ifp->int_flags & IFF_BROADCAST) && | |
123 | same(&ifp->int_broadaddr, addr)) | |
124 | break; | |
125 | if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr)) | |
126 | maybe = ifp; | |
127 | } | |
128 | if (ifp == 0) | |
129 | ifp = maybe; | |
130 | return (ifp); | |
131 | } |