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18916298 RG |
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, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
33 | * static char sccsid[] = "@(#)if.c 5.1 (Berkeley) 6/4/85"; (routed/if.c) | |
34 | */ | |
35 | ||
36 | #ifndef lint | |
37 | static char sccsid[] = "@(#)if.c 5.2 (Berkeley) 6/1/90"; | |
38 | #endif /* not lint */ | |
39 | ||
40 | /* | |
41 | * Routing Table Management Daemon | |
42 | */ | |
43 | #include "defs.h" | |
44 | ||
45 | extern struct interface *ifnet; | |
46 | ||
47 | /* | |
48 | * Find the interface with address addr. | |
49 | */ | |
50 | struct interface * | |
51 | if_ifwithaddr(addr) | |
52 | struct sockaddr *addr; | |
53 | { | |
54 | register struct interface *ifp; | |
55 | ||
56 | #define same(a1, a2) \ | |
57 | (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0) | |
58 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
59 | if (ifp->int_flags & IFF_REMOTE) | |
60 | continue; | |
61 | if (ifp->int_addr.sa_family != addr->sa_family) | |
62 | continue; | |
63 | if (same(&ifp->int_addr, addr)) | |
64 | break; | |
65 | if ((ifp->int_flags & IFF_BROADCAST) && | |
66 | same(&ifp->int_broadaddr, addr)) | |
67 | break; | |
68 | } | |
69 | return (ifp); | |
70 | } | |
71 | ||
72 | /* | |
73 | * Find the point-to-point interface with destination address addr. | |
74 | */ | |
75 | struct interface * | |
76 | if_ifwithdstaddr(addr) | |
77 | struct sockaddr *addr; | |
78 | { | |
79 | register struct interface *ifp; | |
80 | ||
81 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
82 | if ((ifp->int_flags & IFF_POINTOPOINT) == 0) | |
83 | continue; | |
84 | if (same(&ifp->int_dstaddr, addr)) | |
85 | break; | |
86 | } | |
87 | return (ifp); | |
88 | } | |
89 | ||
90 | /* | |
91 | * Find the interface on the network | |
92 | * of the specified address. | |
93 | */ | |
94 | struct interface * | |
95 | if_ifwithnet(addr) | |
96 | register struct sockaddr *addr; | |
97 | { | |
98 | register struct interface *ifp; | |
99 | register int af = addr->sa_family; | |
100 | register int (*netmatch)(); | |
101 | ||
102 | if (af >= AF_MAX) | |
103 | return (0); | |
104 | netmatch = afswitch[af].af_netmatch; | |
105 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
106 | if (ifp->int_flags & IFF_REMOTE) | |
107 | continue; | |
108 | if (af != ifp->int_addr.sa_family) | |
109 | continue; | |
110 | if ((*netmatch)(addr, &ifp->int_addr)) | |
111 | break; | |
112 | } | |
113 | return (ifp); | |
114 | } | |
115 | ||
116 | /* | |
117 | * Find an interface from which the specified address | |
118 | * should have come from. Used for figuring out which | |
119 | * interface a packet came in on -- for tracing. | |
120 | */ | |
121 | struct interface * | |
122 | if_iflookup(addr) | |
123 | struct sockaddr *addr; | |
124 | { | |
125 | register struct interface *ifp, *maybe; | |
126 | register int af = addr->sa_family; | |
127 | register int (*netmatch)(); | |
128 | ||
129 | if (af >= AF_MAX) | |
130 | return (0); | |
131 | maybe = 0; | |
132 | netmatch = afswitch[af].af_netmatch; | |
133 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
134 | if (ifp->int_addr.sa_family != af) | |
135 | continue; | |
136 | if (same(&ifp->int_addr, addr)) | |
137 | break; | |
138 | if ((ifp->int_flags & IFF_BROADCAST) && | |
139 | same(&ifp->int_broadaddr, addr)) | |
140 | break; | |
141 | if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr)) | |
142 | maybe = ifp; | |
143 | } | |
144 | if (ifp == 0) | |
145 | ifp = maybe; | |
146 | return (ifp); | |
147 | } |