244 lines
6.5 KiB
C
244 lines
6.5 KiB
C
|
/*
|
||
|
|
* 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);
|
||
|
|
}
|
||
|
|
}
|