/* * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static char sccsid[] = "@(#)inet.c 8.2 (Berkeley) 8/14/93"; #endif /* not lint */ /* * Temporarily, copy these routines from the kernel, * as we need to know about subnets. */ #include "defs.h" extern struct interface *ifnet; /* * Formulate an Internet address from network + host. */ struct in_addr inet_makeaddr(net, host) u_long net, host; { register struct interface *ifp; register u_long mask; u_long addr; if (IN_CLASSA(net)) mask = IN_CLASSA_HOST; else if (IN_CLASSB(net)) mask = IN_CLASSB_HOST; else mask = IN_CLASSC_HOST; for (ifp = ifnet; ifp; ifp = ifp->int_next) if ((ifp->int_netmask & net) == ifp->int_net) { mask = ~ifp->int_subnetmask; break; } addr = net | (host & mask); addr = htonl(addr); return (*(struct in_addr *)&addr); } /* * Return the network number from an internet address. */ inet_netof(in) struct in_addr in; { register u_long i = ntohl(in.s_addr); register u_long net; register struct interface *ifp; if (IN_CLASSA(i)) net = i & IN_CLASSA_NET; else if (IN_CLASSB(i)) net = i & IN_CLASSB_NET; else net = i & IN_CLASSC_NET; /* * Check whether network is a subnet; * if so, return subnet number. */ for (ifp = ifnet; ifp; ifp = ifp->int_next) if ((ifp->int_netmask & net) == ifp->int_net) return (i & ifp->int_subnetmask); return (net); } /* * Return the host portion of an internet address. */ inet_lnaof(in) struct in_addr in; { register u_long i = ntohl(in.s_addr); register u_long net, host; register struct interface *ifp; if (IN_CLASSA(i)) { net = i & IN_CLASSA_NET; host = i & IN_CLASSA_HOST; } else if (IN_CLASSB(i)) { net = i & IN_CLASSB_NET; host = i & IN_CLASSB_HOST; } else { net = i & IN_CLASSC_NET; host = i & IN_CLASSC_HOST; } /* * Check whether network is a subnet; * if so, use the modified interpretation of `host'. */ for (ifp = ifnet; ifp; ifp = ifp->int_next) if ((ifp->int_netmask & net) == ifp->int_net) return (host &~ ifp->int_subnetmask); return (host); } /* * Return the netmask pertaining to an internet address. */ inet_maskof(inaddr) u_long inaddr; { register u_long i = ntohl(inaddr); register u_long mask; register struct interface *ifp; if (i == 0) { mask = 0; } else if (IN_CLASSA(i)) { mask = IN_CLASSA_NET; } else if (IN_CLASSB(i)) { mask = i & IN_CLASSB_NET; } else mask = i & IN_CLASSC_NET; /* * Check whether network is a subnet; * if so, use the modified interpretation of `host'. */ for (ifp = ifnet; ifp; ifp = ifp->int_next) if ((ifp->int_netmask & i) == ifp->int_net) mask = ifp->int_subnetmask; return (htonl(mask)); } /* * Return RTF_HOST if the address is * for an Internet host, RTF_SUBNET for a subnet, * 0 for a network. */ inet_rtflags(sin) struct sockaddr_in *sin; { register u_long i = ntohl(sin->sin_addr.s_addr); register u_long net, host; register struct interface *ifp; if (IN_CLASSA(i)) { net = i & IN_CLASSA_NET; host = i & IN_CLASSA_HOST; } else if (IN_CLASSB(i)) { net = i & IN_CLASSB_NET; host = i & IN_CLASSB_HOST; } else { net = i & IN_CLASSC_NET; host = i & IN_CLASSC_HOST; } /* * Check whether this network is subnetted; * if so, check whether this is a subnet or a host. */ for (ifp = ifnet; ifp; ifp = ifp->int_next) if (net == ifp->int_net) { if (host &~ ifp->int_subnetmask) return (RTF_HOST); else if (ifp->int_subnetmask != ifp->int_netmask) return (RTF_SUBNET); else return (0); /* network */ } if (host == 0) return (0); /* network */ else return (RTF_HOST); } /* * Return true if a route to subnet/host of route rt should be sent to dst. * Send it only if dst is on the same logical network if not "internal", * otherwise only if the route is the "internal" route for the logical net. */ inet_sendroute(rt, dst) struct rt_entry *rt; struct sockaddr_in *dst; { register u_long r = ntohl(((struct sockaddr_in *)&rt->rt_dst)->sin_addr.s_addr); register u_long d = ntohl(dst->sin_addr.s_addr); if (IN_CLASSA(r)) { if ((r & IN_CLASSA_NET) == (d & IN_CLASSA_NET)) { if ((r & IN_CLASSA_HOST) == 0) return ((rt->rt_state & RTS_INTERNAL) == 0); return (1); } if (r & IN_CLASSA_HOST) return (0); return ((rt->rt_state & RTS_INTERNAL) != 0); } else if (IN_CLASSB(r)) { if ((r & IN_CLASSB_NET) == (d & IN_CLASSB_NET)) { if ((r & IN_CLASSB_HOST) == 0) return ((rt->rt_state & RTS_INTERNAL) == 0); return (1); } if (r & IN_CLASSB_HOST) return (0); return ((rt->rt_state & RTS_INTERNAL) != 0); } else { if ((r & IN_CLASSC_NET) == (d & IN_CLASSC_NET)) { if ((r & IN_CLASSC_HOST) == 0) return ((rt->rt_state & RTS_INTERNAL) == 0); return (1); } if (r & IN_CLASSC_HOST) return (0); return ((rt->rt_state & RTS_INTERNAL) != 0); } }