projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 7ab5124a | 1 | #ifndef lint |
| 2d55efad | 2 | static char sccsid[] = "@(#)if.c 4.4 (Berkeley) %G%"; |
| 7ab5124a SL |
3 | #endif |
| 4 | ||
| 5 | /* | |
| 6 | * Routing Table Management Daemon | |
| 7 | */ | |
| 7fe7fe74 | 8 | #include "defs.h" |
| 7ab5124a SL |
9 | |
| 10 | extern struct interface *ifnet; | |
| 11 | ||
| 12 | /* | |
| 2d55efad | 13 | * Find the interface with address addr. |
| 7ab5124a SL |
14 | */ |
| 15 | struct interface * | |
| 16 | if_ifwithaddr(addr) | |
| 17 | struct sockaddr *addr; | |
| 18 | { | |
| 19 | register struct interface *ifp; | |
| 20 | ||
| 21 | #define same(a1, a2) \ | |
| 22 | (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0) | |
| 23 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
| 24 | if (ifp->int_flags & IFF_REMOTE) | |
| 25 | continue; | |
| 26 | if (ifp->int_addr.sa_family != addr->sa_family) | |
| 27 | continue; | |
| 28 | if (same(&ifp->int_addr, addr)) | |
| 29 | break; | |
| 30 | if ((ifp->int_flags & IFF_BROADCAST) && | |
| 31 | same(&ifp->int_broadaddr, addr)) | |
| 32 | break; | |
| 33 | } | |
| 34 | return (ifp); | |
| 35 | } | |
| 36 | ||
| 2d55efad MK |
37 | /* |
| 38 | * Find the point-to-point interface with destination address addr. | |
| 39 | */ | |
| 40 | struct interface * | |
| 41 | if_ifwithdstaddr(addr) | |
| 42 | struct sockaddr *addr; | |
| 43 | { | |
| 44 | register struct interface *ifp; | |
| 45 | ||
| 46 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
| 47 | if ((ifp->int_flags & IFF_POINTOPOINT) == 0) | |
| 48 | continue; | |
| 49 | if (same(&ifp->int_dstaddr, addr)) | |
| 50 | break; | |
| 51 | } | |
| 52 | return (ifp); | |
| 53 | } | |
| 54 | ||
| 7ab5124a SL |
55 | /* |
| 56 | * Find the interface on the network | |
| 57 | * of the specified address. | |
| 58 | */ | |
| 59 | struct interface * | |
| 60 | if_ifwithnet(addr) | |
| 61 | register struct sockaddr *addr; | |
| 62 | { | |
| 63 | register struct interface *ifp; | |
| 64 | register int af = addr->sa_family; | |
| 65 | register int (*netmatch)(); | |
| 66 | ||
| 67 | if (af >= AF_MAX) | |
| 68 | return (0); | |
| 69 | netmatch = afswitch[af].af_netmatch; | |
| 70 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
| 71 | if (ifp->int_flags & IFF_REMOTE) | |
| 72 | continue; | |
| 73 | if (af != ifp->int_addr.sa_family) | |
| 74 | continue; | |
| 75 | if ((*netmatch)(addr, &ifp->int_addr)) | |
| 76 | break; | |
| 77 | } | |
| 78 | return (ifp); | |
| 79 | } | |
| 80 | ||
| 81 | /* | |
| 82 | * Find an interface from which the specified address | |
| 83 | * should have come from. Used for figuring out which | |
| 84 | * interface a packet came in on -- for tracing. | |
| 85 | */ | |
| 86 | struct interface * | |
| 87 | if_iflookup(addr) | |
| 88 | struct sockaddr *addr; | |
| 89 | { | |
| 90 | register struct interface *ifp, *maybe; | |
| 91 | register int af = addr->sa_family; | |
| 92 | register int (*netmatch)(); | |
| 93 | ||
| 94 | if (af >= AF_MAX) | |
| 95 | return (0); | |
| 96 | maybe = 0; | |
| 97 | netmatch = afswitch[af].af_netmatch; | |
| 98 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
| 99 | if (ifp->int_addr.sa_family != af) | |
| 100 | continue; | |
| 101 | if (same(&ifp->int_addr, addr)) | |
| 102 | break; | |
| 103 | if ((ifp->int_flags & IFF_BROADCAST) && | |
| 104 | same(&ifp->int_broadaddr, addr)) | |
| 105 | break; | |
| 106 | if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr)) | |
| 107 | maybe = ifp; | |
| 108 | } | |
| 109 | if (ifp == 0) | |
| 110 | ifp = maybe; | |
| 111 | return (ifp); | |
| 112 | } |