projects / unix-history / blame
| 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 |
| 4fad5a6e | 8 | static char sccsid[] = "@(#)if.c 5.3 (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; | |
| 4fad5a6e MK |
112 | if ((ifp->int_flags & IFF_POINTOPOINT) && |
| 113 | same(&ifp->int_dstaddr, addr)) | |
| 114 | break; | |
| 7ab5124a SL |
115 | if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr)) |
| 116 | maybe = ifp; | |
| 117 | } | |
| 118 | if (ifp == 0) | |
| 119 | ifp = maybe; | |
| 120 | return (ifp); | |
| 121 | } |