projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 5ff67f98 DF |
1 | /* |
| 2 | * Copyright (c) 1983 Regents of the University of California. | |
| 0eb85d71 KB |
3 | * All rights reserved. |
| 4 | * | |
| d60d530a | 5 | * %sccs.include.redist.c% |
| 5ff67f98 DF |
6 | */ |
| 7 | ||
| 7ab5124a | 8 | #ifndef lint |
| d60d530a | 9 | static char sccsid[] = "@(#)if.c 5.6 (Berkeley) %G%"; |
| 0eb85d71 | 10 | #endif /* not lint */ |
| 7ab5124a SL |
11 | |
| 12 | /* | |
| 13 | * Routing Table Management Daemon | |
| 14 | */ | |
| 7fe7fe74 | 15 | #include "defs.h" |
| 7ab5124a SL |
16 | |
| 17 | extern struct interface *ifnet; | |
| 18 | ||
| 19 | /* | |
| 2d55efad | 20 | * Find the interface with address addr. |
| 7ab5124a SL |
21 | */ |
| 22 | struct interface * | |
| 23 | if_ifwithaddr(addr) | |
| 24 | struct sockaddr *addr; | |
| 25 | { | |
| 26 | register struct interface *ifp; | |
| 27 | ||
| 28 | #define same(a1, a2) \ | |
| 29 | (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0) | |
| 30 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
| 31 | if (ifp->int_flags & IFF_REMOTE) | |
| 32 | continue; | |
| 33 | if (ifp->int_addr.sa_family != addr->sa_family) | |
| 34 | continue; | |
| 35 | if (same(&ifp->int_addr, addr)) | |
| 36 | break; | |
| 37 | if ((ifp->int_flags & IFF_BROADCAST) && | |
| 38 | same(&ifp->int_broadaddr, addr)) | |
| 39 | break; | |
| 40 | } | |
| 41 | return (ifp); | |
| 42 | } | |
| 43 | ||
| 2d55efad MK |
44 | /* |
| 45 | * Find the point-to-point interface with destination address addr. | |
| 46 | */ | |
| 47 | struct interface * | |
| 48 | if_ifwithdstaddr(addr) | |
| 49 | struct sockaddr *addr; | |
| 50 | { | |
| 51 | register struct interface *ifp; | |
| 52 | ||
| 53 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
| 54 | if ((ifp->int_flags & IFF_POINTOPOINT) == 0) | |
| 55 | continue; | |
| 56 | if (same(&ifp->int_dstaddr, addr)) | |
| 57 | break; | |
| 58 | } | |
| 59 | return (ifp); | |
| 60 | } | |
| 61 | ||
| 7ab5124a SL |
62 | /* |
| 63 | * Find the interface on the network | |
| 64 | * of the specified address. | |
| 65 | */ | |
| 66 | struct interface * | |
| 67 | if_ifwithnet(addr) | |
| 68 | register struct sockaddr *addr; | |
| 69 | { | |
| 70 | register struct interface *ifp; | |
| 71 | register int af = addr->sa_family; | |
| 72 | register int (*netmatch)(); | |
| 73 | ||
| 17fe297f | 74 | if (af >= af_max) |
| 7ab5124a SL |
75 | return (0); |
| 76 | netmatch = afswitch[af].af_netmatch; | |
| 77 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
| 78 | if (ifp->int_flags & IFF_REMOTE) | |
| 79 | continue; | |
| 80 | if (af != ifp->int_addr.sa_family) | |
| 81 | continue; | |
| 82 | if ((*netmatch)(addr, &ifp->int_addr)) | |
| 83 | break; | |
| 84 | } | |
| 85 | return (ifp); | |
| 86 | } | |
| 87 | ||
| 88 | /* | |
| 89 | * Find an interface from which the specified address | |
| 90 | * should have come from. Used for figuring out which | |
| 91 | * interface a packet came in on -- for tracing. | |
| 92 | */ | |
| 93 | struct interface * | |
| 94 | if_iflookup(addr) | |
| 95 | struct sockaddr *addr; | |
| 96 | { | |
| 97 | register struct interface *ifp, *maybe; | |
| 98 | register int af = addr->sa_family; | |
| 99 | register int (*netmatch)(); | |
| 100 | ||
| 17fe297f | 101 | if (af >= af_max) |
| 7ab5124a SL |
102 | return (0); |
| 103 | maybe = 0; | |
| 104 | netmatch = afswitch[af].af_netmatch; | |
| 105 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
| 106 | if (ifp->int_addr.sa_family != af) | |
| 107 | continue; | |
| 108 | if (same(&ifp->int_addr, addr)) | |
| 109 | break; | |
| 110 | if ((ifp->int_flags & IFF_BROADCAST) && | |
| 111 | same(&ifp->int_broadaddr, addr)) | |
| 112 | break; | |
| 4fad5a6e MK |
113 | if ((ifp->int_flags & IFF_POINTOPOINT) && |
| 114 | same(&ifp->int_dstaddr, addr)) | |
| 115 | break; | |
| 7ab5124a SL |
116 | if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr)) |
| 117 | maybe = ifp; | |
| 118 | } | |
| 119 | if (ifp == 0) | |
| 120 | ifp = maybe; | |
| 121 | return (ifp); | |
| 122 | } |