inet.c
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上传日期:2007-01-17
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- /* inet.c - inet family routines for routed/rip */
- /* Copyright 1984 - 2002 Wind River Systems, Inc. */
- #include "copyright_wrs.h"
- /*
- * 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.
- *
- * @(#)inet.c 8.3 (Berkeley) 12/30/94
- */
- /*
- modification history
- --------------------
- 01g,22mar02,niq Merged from Synth view, tor3_x.synth branch, ver 01g
- 01f,15oct01,rae merge from truestack ver 01f, base o1e (VIRTUAL_STACK)
- 01e,11sep98,spm replaced ripMakeAddr with optimized results (SPR #22350)
- 01d,01sep98,spm added support for supernets (SPR #22220); removed unused
- inet_maskof routine
- 01c,07apr97,gnn cleared up some of the more egregious warnings.
- 01b,24feb97,gnn Reworked several routines to be in line with WRS standards.
- 01a,26nov96,gnn created from BSD4.4 routed
- */
- /*
- DESCRIPTION
- */
- /*
- * Temporarily, copy these routines from the kernel,
- * as we need to know about subnets.
- */
- #include "vxWorks.h"
- #include "rip/defs.h"
- #ifdef VIRTUAL_STACK
- #include "netinet/vsLib.h"
- #include "netinet/vsRip.h"
- #else
- extern struct interface *ripIfNet;
- #endif
- #define same(a1, a2)
- (memcmp((a1)->sa_data, (a2)->sa_data, 14) == 0)
- /*
- * Return RTF_HOST if the address is
- * for an Internet host, RTF_SUBNET for a subnet,
- * 0 for a network.
- */
- int 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;
- register struct interface *maybe = NULL;
- register u_long dstaddr;
- dstaddr = ntohl ( ((struct sockaddr_in *)sin)->sin_addr.s_addr);
- 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.
- * If we have point to point interfaces, check if the address
- * matches either the local or the remote end of the link.
- * If it does, then return HOST.
- * While going thru the interface list looking for a
- * matching metwork number, we want to find the
- * interface that has the longest subnetmask.
- */
- for (ifp = ripIfNet; ifp; ifp = ifp->int_next)
- {
- if (net == ifp->int_net)
- {
- if ((ifp->int_flags & IFF_POINTOPOINT) &&
- (same (&ifp->int_dstaddr, (struct sockaddr *)sin)
- || same (&ifp->int_addr, (struct sockaddr *)sin)))
- return (RTF_HOST);
- }
- if ((dstaddr & ifp->int_subnetmask) == ifp->int_subnet)
- {
- if (maybe)
- {
- if ( (ifp->int_subnetmask | maybe->int_subnetmask)
- == ifp->int_subnetmask)
- maybe = ifp;
- }
- else
- maybe = ifp;
- }
- }
- if ((ifp = maybe) != NULL)
- {
- if (host &~ ifp->int_subnetmask)
- return (RTF_HOST);
- else if (ifp->int_subnetmask != ifp->int_netmask)
- return (RTF_SUBNET);
- else
- return (0); /* network */
- }
- else
- {
- 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.
- */
- int inet_sendroute
- (
- struct rt_entry *rt,
- struct sockaddr_in *dst,
- struct interface *ifp
- )
- {
- 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);
- register u_long dmask = ifp->int_subnetmask;
- register u_long rmask =
- ntohl ( ((struct sockaddr_in *)&rt->rt_netmask)->sin_addr.s_addr);
- if (IN_CLASSA(r))
- {
- /* Check if destinations share a class-based logical network. */
- if ((r & IN_CLASSA_NET) == (d & IN_CLASSA_NET))
- {
- if ((r & IN_CLASSA_HOST) == 0)
- return ((rt->rt_state & RTS_INTERNAL) == 0);
- return (1);
- }
- /* Also test for a network match based on a possible supernet. */
- if ( ((r & dmask) == (d & dmask)) ||
- ((rmask != 0) && (r & rmask) == (d & rmask)))
- {
- if ((r & IN_CLASSA_HOST) == 0)
- return ((rt->rt_state & RTS_INTERNAL) == 0);
- return (1);
- }
- /*
- * The route and update destinations are on different logical
- * networks. Only send an internally generated route to the
- * entire network. If supernetting is used, this test causes
- * the border gateway to substitute "natural" network routes
- * based on the available interface addresses for the route to
- * the entire supernet.
- */
- 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 & dmask) == (d & dmask)) ||
- ((rmask != 0) && (r & rmask) == (d & rmask)))
- {
- 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 & dmask) == (d & dmask)) ||
- ((rmask != 0) && (r & rmask) == (d & rmask)))
- {
- 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);
- }
- }