projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 7ab5124a SL |
1 | #ifndef lint |
| 2 | static char sccsid[] = "@(#)if.c 4.1 %G%"; | |
| 3 | #endif | |
| 4 | ||
| 5 | /* | |
| 6 | * Routing Table Management Daemon | |
| 7 | */ | |
| 8 | #include "router.h" | |
| 9 | ||
| 10 | extern struct interface *ifnet; | |
| 11 | ||
| 12 | /* | |
| 13 | * Find the interface with address add. | |
| 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 | ||
| 37 | /* | |
| 38 | * Find the interface on the network | |
| 39 | * of the specified address. | |
| 40 | */ | |
| 41 | struct interface * | |
| 42 | if_ifwithnet(addr) | |
| 43 | register struct sockaddr *addr; | |
| 44 | { | |
| 45 | register struct interface *ifp; | |
| 46 | register int af = addr->sa_family; | |
| 47 | register int (*netmatch)(); | |
| 48 | ||
| 49 | if (af >= AF_MAX) | |
| 50 | return (0); | |
| 51 | netmatch = afswitch[af].af_netmatch; | |
| 52 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
| 53 | if (ifp->int_flags & IFF_REMOTE) | |
| 54 | continue; | |
| 55 | if (af != ifp->int_addr.sa_family) | |
| 56 | continue; | |
| 57 | if ((*netmatch)(addr, &ifp->int_addr)) | |
| 58 | break; | |
| 59 | } | |
| 60 | return (ifp); | |
| 61 | } | |
| 62 | ||
| 63 | /* | |
| 64 | * Find an interface from which the specified address | |
| 65 | * should have come from. Used for figuring out which | |
| 66 | * interface a packet came in on -- for tracing. | |
| 67 | */ | |
| 68 | struct interface * | |
| 69 | if_iflookup(addr) | |
| 70 | struct sockaddr *addr; | |
| 71 | { | |
| 72 | register struct interface *ifp, *maybe; | |
| 73 | register int af = addr->sa_family; | |
| 74 | register int (*netmatch)(); | |
| 75 | ||
| 76 | if (af >= AF_MAX) | |
| 77 | return (0); | |
| 78 | maybe = 0; | |
| 79 | netmatch = afswitch[af].af_netmatch; | |
| 80 | for (ifp = ifnet; ifp; ifp = ifp->int_next) { | |
| 81 | if (ifp->int_addr.sa_family != af) | |
| 82 | continue; | |
| 83 | if (same(&ifp->int_addr, addr)) | |
| 84 | break; | |
| 85 | if ((ifp->int_flags & IFF_BROADCAST) && | |
| 86 | same(&ifp->int_broadaddr, addr)) | |
| 87 | break; | |
| 88 | if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr)) | |
| 89 | maybe = ifp; | |
| 90 | } | |
| 91 | if (ifp == 0) | |
| 92 | ifp = maybe; | |
| 93 | return (ifp); | |
| 94 | } |