566 lines
20 KiB
C
566 lines
20 KiB
C
/*
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* Copyright (c) 1983, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)defs.h 8.1 (Berkeley) 6/5/93
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* $Id$
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*/
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#ifndef __NetBSD__
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#ident "$Revision: 1.1.1.1 $"
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#endif
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/* Definitions for RIPv2 routing process.
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*
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* This code is based on the 4.4BSD `routed` daemon, with extensions to
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* support:
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* RIPv2, including variable length subnet masks.
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* Router Discovery
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* aggregate routes in the kernel tables.
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* aggregate advertised routes.
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* maintain spare routes for faster selection of another gateway
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* when the current gateway dies.
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* timers on routes with second granularity so that selection
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* of a new route does not wait 30-60 seconds.
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* tolerance of static routes.
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* tell the kernel hop counts
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* do not advertise if ipforwarding=0
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*
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* The vestigual support for other protocols has been removed. There
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* is no likelihood that IETF RIPv1 or RIPv2 will ever be used with
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* other protocols. The result is far smaller, faster, cleaner, and
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* perhaps understandable.
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*
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* The accumulation of special flags and kludges added over the many
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* years have been simplified and integrated.
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*/
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#include <stdio.h>
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#include <netdb.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#ifdef sgi
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#include <strings.h>
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#include <bstring.h>
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#endif
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#include <stdarg.h>
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#include <syslog.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/sysctl.h>
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#include <sys/socket.h>
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#ifdef sgi
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#include <net/radix.h>
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#else
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#include "radix.h"
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#endif
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#include <net/if.h>
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#include <net/route.h>
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#include <net/if_dl.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#define RIPVERSION RIPv2
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#include <protocols/routed.h>
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/* Type of an IP address.
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* Some systems do not like to pass structures, so do not use in_addr.
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* Some systems think a long has 64 bits, which would be a gross waste.
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* So define it here so it can be changed for the target system.
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* It should be defined somewhere netinet/in.h, but it is not.
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*/
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#ifdef sgi
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#define naddr __uint32_t
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#else
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#ifdef __NetBSD__
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#define naddr u_int32_t
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#else
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#define naddr u_long
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#endif
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#define _HAVE_SA_LEN
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#define _HAVE_SIN_LEN
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#endif
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/* Turn on if IP_DROP_MEMBERSHIP and IP_ADD_MEMBERSHIP do not look at
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* the dstaddr of point-to-point interfaces.
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*/
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/* #define MCAST_PPP_BUG */
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#define NEVER (24*60*60) /* a long time */
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#define EPOCH NEVER /* bias time by this to avoid <0 */
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/* Scan the kernel regularly to see if any interfaces have appeared or been
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* turned off. These must be less than STALE_TIME.
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*/
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#define CHECK_BAD_INTERVAL 5 /* when an interface is known bad */
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#define CHECK_ACT_INTERVAL 30 /* when advertising */
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#define CHECK_QUIET_INTERVAL 300 /* when not */
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#define LIM_SEC(s,l) ((s).tv_sec = MIN((s).tv_sec, (l)))
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/* Router Discovery parameters */
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#ifndef sgi
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#define INADDR_ALLROUTERS_GROUP 0xe0000002 /* 224.0.0.2 */
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#endif
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#define MaxMaxAdvertiseInterval 1800
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#define MinMaxAdvertiseInterval 4
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#define DefMaxAdvertiseInterval 600
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#define DEF_PreferenceLevel 0
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#define MIN_PreferenceLevel 0x80000000
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#define MAX_INITIAL_ADVERT_INTERVAL 16
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#define MAX_INITIAL_ADVERTS 3
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#define MAX_RESPONSE_DELAY 2
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#define MAX_SOLICITATION_DELAY 1
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#define SOLICITATION_INTERVAL 3
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#define MAX_SOLICITATIONS 3
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/* typical packet buffers */
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union pkt_buf {
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char packet[MAXPACKETSIZE+1];
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struct rip rip;
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};
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/* no more routes than this, to protect ourself in case something goes
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* whacko and starts broadcast zillions of bogus routes.
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*/
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#define MAX_ROUTES (128*1024)
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extern int total_routes;
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/* Main, daemon routing table structure
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*/
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struct rt_entry {
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struct radix_node rt_nodes[2]; /* radix tree glue */
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u_int rt_state;
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# define RS_IF 0x001 /* for network interface */
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# define RS_NET_INT 0x002 /* authority route */
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# define RS_NET_SYN 0x004 /* fake net route for subnet */
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# define RS_NO_NET_SYN (RS_LOCAL | RS_LOCAL | RS_IF)
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# define RS_SUBNET 0x008 /* subnet route from any source */
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# define RS_LOCAL 0x010 /* loopback for pt-to-pt */
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# define RS_MHOME 0x020 /* from -m */
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# define RS_STATIC 0x040 /* from the kernel */
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# define RS_RDISC 0x080 /* from router discovery */
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struct sockaddr_in rt_dst_sock;
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naddr rt_mask;
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struct rt_spare {
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struct interface *rts_ifp;
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naddr rts_gate; /* forward packets here */
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naddr rts_router; /* on the authority of this router */
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char rts_metric;
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u_short rts_tag;
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time_t rts_time; /* timer to junk stale routes */
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#define NUM_SPARES 4
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} rt_spares[NUM_SPARES];
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u_int rt_seqno; /* when last changed */
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char rt_poison_metric; /* to notice maximum recently */
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time_t rt_poison_time; /* advertised metric */
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};
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#define rt_dst rt_dst_sock.sin_addr.s_addr
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#define rt_ifp rt_spares[0].rts_ifp
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#define rt_gate rt_spares[0].rts_gate
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#define rt_router rt_spares[0].rts_router
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#define rt_metric rt_spares[0].rts_metric
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#define rt_tag rt_spares[0].rts_tag
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#define rt_time rt_spares[0].rts_time
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#define HOST_MASK 0xffffffff
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#define RT_ISHOST(rt) ((rt)->rt_mask == HOST_MASK)
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/* age all routes that
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* are not from -g, -m, or static routes from the kernel
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* not unbroken interface routes
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* but not broken interfaces
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* nor non-passive, remote interfaces that are not aliases
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* (i.e. remote & metric=0)
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*/
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#define AGE_RT(rt_state,ifp) (0 == ((rt_state) & (RS_MHOME | RS_STATIC \
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| RS_NET_SYN | RS_RDISC)) \
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&& (!((rt_state) & RS_IF) \
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|| (ifp) == 0 \
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|| (((ifp)->int_state & IS_REMOTE) \
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&& !((ifp)->int_state & IS_PASSIVE))))
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/* true if A is better than B
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* Better if
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* - A is not a poisoned route
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* - and A is not stale
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* - and A has a shorter path
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* - or is the router speaking for itself
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* - or the current route is equal but stale
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* - or it is a host route advertised by a system for itself
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*/
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#define BETTER_LINK(rt,A,B) ((A)->rts_metric < HOPCNT_INFINITY \
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&& now_stale <= (A)->rts_time \
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&& ((A)->rts_metric < (B)->rts_metric \
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|| ((A)->rts_gate == (A)->rts_router \
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&& (B)->rts_gate != (B)->rts_router) \
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|| ((A)->rts_metric == (B)->rts_metric \
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&& now_stale > (B)->rts_time) \
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|| (RT_ISHOST(rt) \
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&& (rt)->rt_dst == (A)->rts_router \
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&& (A)->rts_metric == (B)->rts_metric)))
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/* An "interface" is similar to a kernel ifnet structure, except it also
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* handles "logical" or "IS_REMOTE" interfaces (remote gateways).
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*/
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struct interface {
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struct interface *int_next, *int_prev;
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char int_name[IFNAMSIZ+15+1]; /* big enough for IS_REMOTE */
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u_short int_index;
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naddr int_addr; /* address on this host (net order) */
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naddr int_brdaddr; /* broadcast address (n) */
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naddr int_dstaddr; /* other end of pt-to-pt link (n) */
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naddr int_net; /* working network # (host order)*/
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naddr int_mask; /* working net mask (host order) */
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naddr int_ripv1_mask; /* for inferring a mask (n) */
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naddr int_std_addr; /* class A/B/C address (n) */
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naddr int_std_net; /* class A/B/C network (h) */
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naddr int_std_mask; /* class A/B/C netmask (h) */
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int int_rip_sock; /* for queries */
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int int_if_flags; /* some bits copied from kernel */
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u_int int_state;
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time_t int_act_time; /* last thought healthy */
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u_short int_transitions; /* times gone up-down */
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char int_metric;
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char int_d_metric; /* for faked default route */
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struct int_data {
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u_int ipackets; /* previous network stats */
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u_int ierrors;
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u_int opackets;
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u_int oerrors;
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#ifdef sgi
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u_int odrops;
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#endif
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time_t ts; /* timestamp on network stats */
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} int_data;
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char int_passwd[RIP_AUTH_PW_LEN]; /* RIPv2 password */
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int int_rdisc_pref; /* advertised rdisc preference */
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int int_rdisc_int; /* MaxAdvertiseInterval */
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int int_rdisc_cnt;
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struct timeval int_rdisc_timer;
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};
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/* bits in int_state */
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#define IS_ALIAS 0x0000001 /* interface alias */
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#define IS_SUBNET 0x0000002 /* interface on subnetted network */
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#define IS_REMOTE 0x0000004 /* interface is not on this machine */
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#define IS_PASSIVE 0x0000008 /* remote and does not do RIP */
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#define IS_EXTERNAL 0x0000010 /* handled by EGP or something */
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#define IS_CHECKED 0x0000020 /* still exists */
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#define IS_ALL_HOSTS 0x0000040 /* in INADDR_ALLHOSTS_GROUP */
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#define IS_ALL_ROUTERS 0x0000080 /* in INADDR_ALLROUTERS_GROUP */
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#define IS_RIP_QUERIED 0x0000100 /* query broadcast */
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#define IS_BROKE 0x0000200 /* seems to be broken */
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#define IS_SICK 0x0000400 /* seems to be broken */
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#define IS_DUP 0x0000800 /* has a duplicate address */
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#define IS_ACTIVE 0x0001000 /* heard from it at least once */
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#define IS_NEED_NET_SYN 0x0002000 /* need RS_NET_SYN route */
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#define IS_NO_AG 0x0004000 /* do not aggregate subnets */
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#define IS_NO_SUPER_AG 0x0008000 /* do not aggregate networks */
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#define IS_NO_RIPV1_IN 0x0010000 /* no RIPv1 input at all */
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#define IS_NO_RIPV2_IN 0x0020000 /* no RIPv2 input at all */
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#define IS_NO_RIP_IN (IS_NO_RIPV1_IN | IS_NO_RIPV2_IN)
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#define IS_RIP_IN_OFF(s) (((s) & IS_NO_RIP_IN) == IS_NO_RIP_IN)
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#define IS_NO_RIPV1_OUT 0x0040000 /* no RIPv1 output at all */
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#define IS_NO_RIPV2_OUT 0x0080000 /* no RIPv2 output at all */
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#define IS_NO_RIP_OUT (IS_NO_RIPV1_OUT | IS_NO_RIPV2_OUT)
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#define IS_NO_RIP (IS_NO_RIP_OUT | IS_NO_RIP_IN)
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#define IS_RIP_OUT_OFF(s) (((s) & IS_NO_RIP_OUT) == IS_NO_RIP_OUT)
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#define IS_RIP_OFF(s) (((s) & IS_NO_RIP) == IS_NO_RIP)
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#define IS_NO_ADV_IN 0x0100000
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#define IS_NO_SOL_OUT 0x0200000 /* no solicitations */
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#define IS_SOL_OUT 0x0400000 /* send solicitations */
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#define GROUP_IS_SOL (IS_NO_ADV_IN|IS_NO_SOL_OUT)
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#define IS_NO_ADV_OUT 0x0800000 /* do not advertise rdisc */
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#define IS_ADV_OUT 0x1000000 /* advertise rdisc */
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#define GROUP_IS_ADV (IS_NO_ADV_OUT|IS_ADV_OUT)
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#define IS_BCAST_RDISC 0x2000000 /* broadcast instead of multicast */
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#define IS_NO_RDISC (IS_NO_ADV_IN | IS_NO_SOL_OUT | IS_NO_ADV_OUT)
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#define IS_PM_RDISC 0x4000000 /* poor-man's router discovery */
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#ifdef sgi
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#define IFF_UP_RUNNING (IFF_RUNNING|IFF_UP)
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#else
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#define IFF_UP_RUNNING IFF_UP
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#endif
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#define iff_alive(f) (((f) & IFF_UP_RUNNING) == IFF_UP_RUNNING)
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/* Information for aggregating routes */
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#define NUM_AG_SLOTS 32
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struct ag_info {
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struct ag_info *ag_fine; /* slot with finer netmask */
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struct ag_info *ag_cors; /* more coarse netmask */
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naddr ag_dst_h; /* destination in host byte order */
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naddr ag_mask;
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naddr ag_gate;
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naddr ag_nhop;
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char ag_metric; /* metric to be advertised */
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char ag_pref; /* aggregate based on this */
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u_int ag_seqno;
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u_short ag_tag;
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u_short ag_state;
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#define AGS_SUPPRESS 0x001 /* combine with coaser mask */
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#define AGS_PROMOTE 0x002 /* synthesize combined routes */
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#define AGS_REDUN0 0x004 /* redundant, finer routes output */
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#define AGS_REDUN1 0x008
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#define AG_IS_REDUN(state) (((state) & (AGS_REDUN0 | AGS_REDUN1)) \
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== (AGS_REDUN0 | AGS_REDUN1))
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#define AGS_GATEWAY 0x010 /* tell kernel RTF_GATEWAY */
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#define AGS_IF 0x020 /* for an interface */
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#define AGS_RIPV2 0x040 /* send only as RIPv2 */
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#define AGS_FINE_GATE 0x080 /* ignore differing ag_gate when this
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* has the finer netmask */
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#define AGS_CORS_GATE 0x100 /* ignore differing gate when this
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* has the coarser netmaks */
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#define AGS_SPLIT_HZ 0x200 /* suppress for split horizon */
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/* some bits are set if they are set on either route */
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#define AGS_PROMOTE_EITHER (AGS_RIPV2 | AGS_GATEWAY | \
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AGS_SUPPRESS | AGS_CORS_GATE)
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};
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/* parameters for interfaces */
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extern struct parm {
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struct parm *parm_next;
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char parm_name[IFNAMSIZ+1];
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naddr parm_addr_h;
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naddr parm_mask;
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char parm_d_metric;
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u_int parm_int_state;
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int parm_rdisc_pref;
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int parm_rdisc_int;
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char parm_passwd[RIP_AUTH_PW_LEN+1];
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} *parms;
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/* authority for internal networks */
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extern struct intnet {
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struct intnet *intnet_next;
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naddr intnet_addr;
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naddr intnet_mask;
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char intnet_metric;
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} *intnets;
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extern pid_t mypid;
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extern naddr myaddr; /* main address of this system */
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extern int stopint; /* !=0 to stop */
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extern int sock_max;
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extern int rip_sock; /* RIP socket */
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extern struct interface *rip_sock_mcast; /* current multicast interface */
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extern int rt_sock; /* routing socket */
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extern int rt_sock_seqno;
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extern int rdisc_sock; /* router-discovery raw socket */
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extern int seqno; /* sequence number for messages */
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extern int supplier; /* process should supply updates */
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extern int lookforinterfaces; /* 1=probe for new up interfaces */
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extern int supplier_set; /* -s or -q requested */
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extern int ridhosts; /* 1=reduce host routes */
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extern int mhome; /* 1=want multi-homed host route */
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extern int advertise_mhome; /* 1=must continue adverising it */
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extern int auth_ok; /* 1=ignore auth if we do not care */
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extern struct timeval epoch; /* when started */
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extern struct timeval now; /* current idea of time */
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extern time_t now_stale;
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extern time_t now_expire;
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extern time_t now_garbage;
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extern struct timeval next_bcast; /* next general broadcast */
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extern struct timeval age_timer; /* next check of old routes */
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extern struct timeval no_flash; /* inhibit flash update until then */
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extern struct timeval rdisc_timer; /* next advert. or solicitation */
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extern int rdisc_ok; /* using solicited route */
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extern struct timeval ifinit_timer; /* time to check interfaces */
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extern naddr loopaddr; /* our address on loopback */
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extern int tot_interfaces; /* # of remote and local interfaces */
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extern int rip_interfaces; /* # of interfaces doing RIP */
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extern struct interface *ifnet; /* all interfaces */
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extern int have_ripv1_out; /* have a RIPv1 interface */
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extern int have_ripv1_in;
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extern int need_flash; /* flash update needed */
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extern struct timeval need_kern; /* need to update kernel table */
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extern int update_seqno; /* a route has changed */
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extern u_int tracelevel, new_tracelevel;
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#define MAX_TRACELEVEL 4
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#define TRACEKERNEL (tracelevel >= 4) /* log kernel changes */
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#define TRACECONTENTS (tracelevel >= 3) /* display packet contents */
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#define TRACEPACKETS (tracelevel >= 2) /* note packets */
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#define TRACEACTIONS (tracelevel != 0)
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extern FILE *ftrace; /* output trace file */
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extern struct radix_node_head *rhead;
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#ifdef sgi
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/* Fix conflicts */
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#define dup2(x,y) BSDdup2(x,y)
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#endif /* sgi */
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extern void fix_sock(int, char *);
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extern void fix_select(void);
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extern void rip_off(void);
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extern void rip_on(struct interface *);
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enum output_type {OUT_QUERY, OUT_UNICAST, OUT_BROADCAST, OUT_MULTICAST,
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NO_OUT_MULTICAST, NO_OUT_RIPV2};
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extern int output(enum output_type, struct sockaddr_in *,
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struct interface *, struct rip *, int);
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extern void rip_query(void);
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extern void rip_bcast(int);
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extern void supply(struct sockaddr_in *, struct interface *,
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enum output_type, int, int);
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extern void msglog(char *, ...);
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#define LOGERR(msg) msglog(msg ": %s", strerror(errno))
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extern void logbad(int, char *, ...);
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#define BADERR(dump,msg) logbad(dump,msg ": %s", strerror(errno))
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#ifdef DEBUG
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#define DBGERR(dump,msg) BADERR(dump,msg)
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#else
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#define DBGERR(dump,msg) LOGERR(msg)
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#endif
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extern char *naddr_ntoa(naddr);
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extern char *saddr_ntoa(struct sockaddr *);
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extern void *rtmalloc(size_t, char *);
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extern void timevaladd(struct timeval *, struct timeval *);
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extern void intvl_random(struct timeval *, u_long, u_long);
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extern int getnet(char *, naddr *, naddr *);
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extern int gethost(char *, naddr *);
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extern void gwkludge(void);
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extern char *parse_parms(char *);
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extern char *check_parms(struct parm *);
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extern void get_parms(struct interface *);
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extern void lastlog(void);
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extern void trace_on(char *, int);
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extern void trace_off(char*, ...);
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extern void trace_flush(void);
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extern void set_tracelevel(void);
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extern void trace_kernel(char *, ...);
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extern void trace_act(char *, ...);
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extern void trace_pkt(char *, ...);
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extern void trace_add_del(char *, struct rt_entry *);
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extern void trace_change(struct rt_entry *, u_int, naddr, naddr, int,
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u_short, struct interface *, time_t, char *);
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extern void trace_if(char *, struct interface *);
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extern void trace_upslot(struct rt_entry *, struct rt_spare *,
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naddr, naddr,
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struct interface *, int, u_short, time_t);
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extern void trace_rip(char*, char*, struct sockaddr_in *,
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struct interface *, struct rip *, int);
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extern char *addrname(naddr, naddr, int);
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extern void rdisc_age(naddr);
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extern void set_rdisc_mg(struct interface *, int);
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extern void set_supplier(void);
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extern void if_bad_rdisc(struct interface *);
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extern void if_ok_rdisc(struct interface *);
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extern void read_rip(int, struct interface *);
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extern void read_rt(void);
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extern void read_d(void);
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extern void rdisc_adv(void);
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extern void rdisc_sol(void);
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extern void sigalrm(int);
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extern void sigterm(int);
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extern void sigtrace_on(int);
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extern void sigtrace_off(int);
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extern void flush_kern(void);
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extern void age(naddr);
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extern void ag_flush(naddr, naddr, void (*)(struct ag_info *));
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extern void ag_check(naddr, naddr, naddr, naddr, char, char, u_int,
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u_short, u_short, void (*)(struct ag_info *));
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extern void del_static(naddr, naddr, int);
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extern void del_redirects(naddr, time_t);
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extern struct rt_entry *rtget(naddr, naddr);
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extern struct rt_entry *rtfind(naddr);
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extern void rtinit(void);
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extern void rtadd(naddr, naddr, naddr, naddr,
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int, u_short, u_int, struct interface *);
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extern void rtchange(struct rt_entry *, u_int, naddr,naddr, int, u_short,
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struct interface *ifp, time_t, char *);
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extern void rtdelete(struct rt_entry *);
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extern void rtbad_sub(struct rt_entry *);
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extern void rtswitch(struct rt_entry *, struct rt_spare *);
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extern void rtbad(struct rt_entry *);
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#define S_ADDR(x) (((struct sockaddr_in *)(x))->sin_addr.s_addr)
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#define INFO_DST(I) ((I)->rti_info[RTAX_DST])
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#define INFO_GATE(I) ((I)->rti_info[RTAX_GATEWAY])
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#define INFO_MASK(I) ((I)->rti_info[RTAX_NETMASK])
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#define INFO_IFA(I) ((I)->rti_info[RTAX_IFA])
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#define INFO_IFP(I) ((I)->rti_info[RTAX_IFP])
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#define INFO_AUTHOR(I) ((I)->rti_info[RTAX_AUTHOR])
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#define INFO_BRD(I) ((I)->rti_info[RTAX_BRD])
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void rt_xaddrs(struct rt_addrinfo *, struct sockaddr *, struct sockaddr *,
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int);
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extern naddr std_mask(naddr);
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extern naddr ripv1_mask_net(naddr, struct interface *);
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extern naddr ripv1_mask_host(naddr,struct interface *);
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#define on_net(a,net,mask) (((ntohl(a) ^ (net)) & (mask)) == 0)
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extern int check_dst(naddr);
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extern void addrouteforif(register struct interface *);
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extern void ifinit(void);
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extern int walk_bad(struct radix_node *, struct walkarg *);
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extern int if_ok(struct interface *, char *);
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extern void if_sick(struct interface *);
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extern void if_bad(struct interface *);
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extern struct interface *ifwithaddr(naddr, int, int);
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extern struct interface *ifwithname(char *, naddr);
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extern struct interface *ifwithindex(u_short);
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extern struct interface *iflookup(naddr);
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