1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * static char sccsid[] = "@(#)if.c 5.1 (Berkeley) 6/4/85"; (routed/if.c) 8 */ 9 10 #ifndef lint 11 static char sccsid[] = "@(#)if.c 8.1 (Berkeley) 06/05/93"; 12 #endif /* not lint */ 13 14 /* 15 * Routing Table Management Daemon 16 */ 17 #include "defs.h" 18 19 extern struct interface *ifnet; 20 21 /* 22 * Find the interface with address addr. 23 */ 24 struct interface * 25 if_ifwithaddr(addr) 26 struct sockaddr *addr; 27 { 28 register struct interface *ifp; 29 30 #define same(a1, a2) \ 31 (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0) 32 for (ifp = ifnet; ifp; ifp = ifp->int_next) { 33 if (ifp->int_flags & IFF_REMOTE) 34 continue; 35 if (ifp->int_addr.sa_family != addr->sa_family) 36 continue; 37 if (same(&ifp->int_addr, addr)) 38 break; 39 if ((ifp->int_flags & IFF_BROADCAST) && 40 same(&ifp->int_broadaddr, addr)) 41 break; 42 } 43 return (ifp); 44 } 45 46 /* 47 * Find the point-to-point interface with destination address addr. 48 */ 49 struct interface * 50 if_ifwithdstaddr(addr) 51 struct sockaddr *addr; 52 { 53 register struct interface *ifp; 54 55 for (ifp = ifnet; ifp; ifp = ifp->int_next) { 56 if ((ifp->int_flags & IFF_POINTOPOINT) == 0) 57 continue; 58 if (same(&ifp->int_dstaddr, addr)) 59 break; 60 } 61 return (ifp); 62 } 63 64 /* 65 * Find the interface on the network 66 * of the specified address. 67 */ 68 struct interface * 69 if_ifwithnet(addr) 70 register struct sockaddr *addr; 71 { 72 register struct interface *ifp; 73 register int af = addr->sa_family; 74 register int (*netmatch)(); 75 76 if (af >= AF_MAX) 77 return (0); 78 netmatch = afswitch[af].af_netmatch; 79 for (ifp = ifnet; ifp; ifp = ifp->int_next) { 80 if (ifp->int_flags & IFF_REMOTE) 81 continue; 82 if (af != ifp->int_addr.sa_family) 83 continue; 84 if ((*netmatch)(addr, &ifp->int_addr)) 85 break; 86 } 87 return (ifp); 88 } 89 90 /* 91 * Find an interface from which the specified address 92 * should have come from. Used for figuring out which 93 * interface a packet came in on -- for tracing. 94 */ 95 struct interface * 96 if_iflookup(addr) 97 struct sockaddr *addr; 98 { 99 register struct interface *ifp, *maybe; 100 register int af = addr->sa_family; 101 register int (*netmatch)(); 102 103 if (af >= AF_MAX) 104 return (0); 105 maybe = 0; 106 netmatch = afswitch[af].af_netmatch; 107 for (ifp = ifnet; ifp; ifp = ifp->int_next) { 108 if (ifp->int_addr.sa_family != af) 109 continue; 110 if (same(&ifp->int_addr, addr)) 111 break; 112 if ((ifp->int_flags & IFF_BROADCAST) && 113 same(&ifp->int_broadaddr, addr)) 114 break; 115 if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr)) 116 maybe = ifp; 117 } 118 if (ifp == 0) 119 ifp = maybe; 120 return (ifp); 121 } 122