NetBSD/sbin/routed/af.c

254 lines
6.5 KiB
C
Raw Normal View History

1995-07-24 17:03:25 +04:00
/* $NetBSD: af.c,v 1.12 1995/07/24 13:03:25 ws Exp $ */
1993-03-21 12:45:37 +03:00
/*
1994-05-13 12:02:16 +04:00
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
1993-03-21 12:45:37 +03:00
*
* 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
#if 0
static char sccsid[] = "@(#)af.c 8.1 (Berkeley) 6/5/93";
#else
1995-07-24 17:03:25 +04:00
static char rcsid[] = "$NetBSD: af.c,v 1.12 1995/07/24 13:03:25 ws Exp $";
#endif
1993-03-21 12:45:37 +03:00
#endif /* not lint */
#include "defs.h"
/*
* Address family support routines
*/
static void inet_canon __P((struct sockaddr *));
static int inet_checkhost __P((struct sockaddr *));
static char *inet_format __P((struct sockaddr *, char *buf, size_t sz));
static void inet_hash __P((struct sockaddr *, struct afhash *));
static int inet_netmatch __P((struct sockaddr *, struct sockaddr *));
static int inet_portcheck __P((struct sockaddr *));
static int inet_portmatch __P((struct sockaddr *));
static void inet_output __P((int, int, struct sockaddr *, int));
static int inet_get __P((int, void *, struct sockaddr *));
static void inet_put __P((void *, struct sockaddr *));
1993-03-21 12:45:37 +03:00
#define NIL { 0 }
#define INET \
{ inet_hash, inet_netmatch, inet_output, \
inet_portmatch, inet_portcheck, inet_checkhost, \
inet_rtflags, inet_sendroute, inet_canon, \
inet_format, inet_get, inet_put \
1993-03-21 12:45:37 +03:00
}
struct afswitch afswitch[AF_MAX] = {
NIL, /* 0- unused */
NIL, /* 1- Unix domain, unused */
INET, /* Internet */
};
int af_max = sizeof(afswitch) / sizeof(afswitch[0]);
struct sockaddr_in inet_default = {
#ifdef RTM_ADD
sizeof (inet_default),
#endif
AF_INET, INADDR_ANY };
static void
inet_hash(sa, hp)
struct sockaddr *sa;
1993-03-21 12:45:37 +03:00
struct afhash *hp;
{
struct sockaddr_in *sin = (struct sockaddr_in *) sa;
1993-03-21 12:45:37 +03:00
register u_long n;
n = inet_netof_subnet(sin->sin_addr);
1993-03-21 12:45:37 +03:00
if (n)
while ((n & 0xff) == 0)
n >>= 8;
hp->afh_nethash = n;
hp->afh_hosthash = ntohl(sin->sin_addr.s_addr);
hp->afh_hosthash &= 0x7fffffff;
}
static int
inet_netmatch(sa1, sa2)
struct sockaddr *sa1, *sa2;
1993-03-21 12:45:37 +03:00
{
struct sockaddr_in *sin1 = (struct sockaddr_in *) sa1;
struct sockaddr_in *sin2 = (struct sockaddr_in *) sa2;
1993-03-21 12:45:37 +03:00
return (inet_netof_subnet(sin1->sin_addr) ==
inet_netof_subnet(sin2->sin_addr));
1993-03-21 12:45:37 +03:00
}
/*
* Verify the message is from the right port.
*/
static int
inet_portmatch(sa)
struct sockaddr *sa;
1993-03-21 12:45:37 +03:00
{
struct sockaddr_in *sin = (struct sockaddr_in *) sa;
1993-03-21 12:45:37 +03:00
return (sin->sin_port == sp->s_port);
}
/*
* Verify the message is from a "trusted" port.
*/
static int
inet_portcheck(sa)
struct sockaddr *sa;
1993-03-21 12:45:37 +03:00
{
struct sockaddr_in *sin = (struct sockaddr_in *) sa;
1993-03-21 12:45:37 +03:00
return (ntohs(sin->sin_port) <= IPPORT_RESERVED);
}
/*
* Internet output routine.
*/
static void
inet_output(s, flags, sa, size)
1993-03-21 12:45:37 +03:00
int s, flags;
struct sockaddr *sa;
1993-03-21 12:45:37 +03:00
int size;
{
struct sockaddr_in *sin = (struct sockaddr_in *) sa;
1993-03-21 12:45:37 +03:00
struct sockaddr_in dst;
dst = *sin;
sin = &dst;
if (sin->sin_port == 0)
sin->sin_port = sp->s_port;
if (sin->sin_len == 0)
sin->sin_len = sizeof (*sin);
if (sendto(s, packet, size, flags,
(struct sockaddr *)sin, sizeof (*sin)) < 0)
perror("sendto");
}
/*
* Return 1 if the address is believed
* for an Internet host -- THIS IS A KLUDGE.
*/
static int
inet_checkhost(sa)
struct sockaddr *sa;
1993-03-21 12:45:37 +03:00
{
struct sockaddr_in *sin = (struct sockaddr_in *) sa;
1993-03-21 12:45:37 +03:00
u_long i = ntohl(sin->sin_addr.s_addr);
#ifndef IN_EXPERIMENTAL
#define IN_EXPERIMENTAL(i) (((long) (i) & 0xe0000000) == 0xe0000000)
#endif
if (IN_EXPERIMENTAL(i) || sin->sin_port != 0)
return (0);
if (i != 0 && (i & 0xff000000) == 0)
return (0);
for (i = 0; i < sizeof(sin->sin_zero)/sizeof(sin->sin_zero[0]); i++)
if (sin->sin_zero[i])
return (0);
return (1);
}
static void
inet_canon(sa)
struct sockaddr *sa;
1993-03-21 12:45:37 +03:00
{
struct sockaddr_in *sin = (struct sockaddr_in *) sa;
1993-03-21 12:45:37 +03:00
sin->sin_port = 0;
sin->sin_len = sizeof(*sin);
}
static char *
inet_format(sa, buf, sz)
struct sockaddr *sa;
char *buf; size_t sz;
1993-03-21 12:45:37 +03:00
{
struct sockaddr_in *sin = (struct sockaddr_in *) sa;
1995-05-24 19:54:00 +04:00
strncpy(buf, inet_ntoa(sin->sin_addr), sz);
buf[sz - 1] = '\0';
return buf;
}
static int
inet_get(what, pck, sa)
int what;
void *pck;
struct sockaddr *sa;
{
struct sockaddr_in *sin = (struct sockaddr_in *) sa;
struct netinfo *n = pck;
/* XXX: Internet only */
memset(sin, 0, sizeof(*sin));
switch (what) {
case DESTINATION:
sin->sin_addr.s_addr = n->rip_dst;
break;
case NETMASK:
if (n->rip_netmask == 0)
return 0;
sin->sin_addr.s_addr = n->rip_netmask;
break;
case GATEWAY:
if (n->rip_router == 0)
return 0;
sin->sin_addr.s_addr = n->rip_router;
break;
default:
abort();
break;
}
sin->sin_family = n->rip_family;
#if BSD >= 198810
sin->sin_len = sizeof(*sin);
#endif
return 1;
}
static void
inet_put(pck, sa)
void *pck;
struct sockaddr *sa;
{
struct netinfo *n = pck;
struct sockaddr_in *sin = (struct sockaddr_in *) sa;
1995-07-24 17:03:25 +04:00
#if BSD >= 198810
n->rip_family = htons(sin->sin_family);
#else
n->rip_family = sin->sin_family;
1995-07-24 17:03:25 +04:00
#endif
n->rip_dst = sin->sin_addr.s_addr;
1993-03-21 12:45:37 +03:00
}