/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 1983, 1988, 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 acknowledgment:
 *      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.
 *
 *      @(#)defs.h      8.1 (Berkeley) 6/5/93
 *
 * $FreeBSD: src/sbin/routed/defs.h,v 1.14 2000/08/11 08:24:38 sheldonh Exp $
 */

#ifndef _DEFS_H
#define _DEFS_H

/*
 * Definitions for RIPv2 routing process.
 *
 * This code is based on the 4.4BSD `routed` daemon, with extensions to
 * support:
 *      RIPv2, including variable length subnet masks.
 *      Router Discovery
 *      aggregate routes in the kernel tables.
 *      aggregate advertised routes.
 *      maintain spare routes for faster selection of another gateway
 *              when the current gateway dies.
 *      timers on routes with second granularity so that selection
 *              of a new route does not wait 30-60 seconds.
 *      tolerance of static routes.
 *      tell the kernel hop counts.
 *      use of per-interface ip_forwarding state.
 *
 * The vestigial support for other protocols has been removed.  There
 * is no likelihood that IETF RIPv1 or RIPv2 will ever be used with
 * other protocols.  The result is far smaller, faster, cleaner, and
 * perhaps understandable.
 *
 * The accumulation of special flags and kludges added over the many
 * years have been simplified and integrated.
 */

#ifdef __cplusplus
extern "C" {
#endif

#include <stdio.h>
#include <netdb.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdarg.h>
#include <syslog.h>
#include <time.h>
#include <md5.h>
#include <libintl.h>
#include <locale.h>
#include "radix.h"

#include <sys/time.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sysmacros.h>

#include <net/if.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define RIPVERSION RIPv2
#include <protocols/routed.h>


#define DAY (24*60*60)
#define NEVER DAY                       /* a long time */
#define EPOCH NEVER                     /* bias time by this to avoid <0 */

/*
 * Scan the kernel regularly to see if any interfaces have appeared or been
 * turned off.
 */
#define CHECK_BAD_INTERVAL      5       /* when an interface is known bad */
#define CHECK_ACT_INTERVAL      30      /* when advertising */
#define CHECK_QUIET_INTERVAL    300     /* when not */

/*
 * Limit the seconds in the timeval structure "s" to "l" seconds, but only
 * if l is less than the current seconds in s.  This is used to shorten
 * certain timers to ensure that scheduled events occur sooner than
 * originally scheduled.
 */
#define LIM_SEC(s, l) ((s).tv_sec = MIN((s).tv_sec, (l)))

/*
 * Metric used for fake default routes.  It ought to be 15, but when
 * processing advertised routes, previous versions of `routed` added
 * to the received metric and discarded the route if the total was 16
 * or larger.
 */
#define FAKE_METRIC (HOPCNT_INFINITY-2)


/* Router Discovery parameters */
#define MAX_MAXADVERTISEINTERVAL        1800
#define MIN_MAXADVERTISEINTERVAL        4
#define DEF_MAXADVERTISEINTERVAL        600
#define DEF_PREFERENCELEVEL             0
#define MIN_PREFERENCELEVEL             0x80000000

#define MAX_INITIAL_ADVERT_INTERVAL     16
#define MAX_INITIAL_ADVERTS             3
#define MAX_RESPONSE_DELAY              2

#define MAX_SOLICITATION_DELAY          1
#define SOLICITATION_INTERVAL           3
#define MAX_SOLICITATIONS               3

/*
 * convert between signed, balanced around zero,
 * and unsigned zero-based preferences
 */
#define SIGN_PREF(p) ((p) ^ MIN_PREFERENCELEVEL)
#define UNSIGN_PREF(p) SIGN_PREF(p)

/*
 * Bloated packet size for systems that simply add authentication to
 * full-sized packets
 */
#define OVER_MAXPACKETSIZE (MAXPACKETSIZE+sizeof (struct netinfo)*2)
/* typical packet buffers */
union pkt_buf {
        uint8_t packet[OVER_MAXPACKETSIZE*2];
        struct  rip rip;
};

extern struct dr *drs;

/*
 * IF_NAME_LEN is the maximum size of interface names represented within
 * in.routed.  Regular Solaris interfaces have names of at most LIFNAMESIZ
 * characters, but in.routed has remote interfaces represented internally
 * as "remote(<gatewayname>)", where <gatewayname> is a hostname or IP
 * address.  IF_NAME_LEN needs to be large enough to also hold such
 * interface names as well.
 */
#define IF_NAME_LEN     (MAXHOSTNAMELEN + sizeof ("remote()") + 1)

/*
 * No more routes than this, to protect ourself in case something goes
 * whacko and starts broadcasting zillions of bogus routes.
 */
#define MAX_ROUTES  (128*1024)

enum origin {
        RO_NONE,        /* empty slot */
        RO_RIP,         /* learnt from RIP */
        RO_RDISC,       /* learnt from RDISC */
        RO_STATIC,      /* learnt from kernel */
        RO_LOOPBCK,     /* loopback route */
        RO_PTOPT,       /* point-to-point route */
        RO_NET_SYN,     /* fake net route for subnet */
        RO_IF,          /* interface route */
        RO_FILE         /* from /etc/gateways */
};

/*
 * Main, daemon routing table structure
 */
struct rt_spare {
        struct interface *rts_ifp;
        uint32_t        rts_gate;       /* forward packets here */
        uint32_t        rts_router;     /* on this router's authority */
        uint8_t         rts_metric;
        enum origin     rts_origin;
        uint16_t        rts_tag;
        time_t          rts_time;       /* timer to junk stale routes */
        uint32_t        rts_de_ag;      /* de-aggregation level */
        uint16_t        rts_flags;
};

#define RTS_EXTERNAL    0x0001  /* handled by other routing protocol e.g. EGP */
#define SPARE_INC       2
#define EMPTY_RT_SPARE  { NULL, 0, 0, HOPCNT_INFINITY, RO_NONE, 0, 0, 0, 0 }

struct rt_entry {
        struct radix_node rt_nodes[2];  /* radix tree glue */
        struct sockaddr_in rt_dst_sock;
        time_t          rt_poison_time; /* advertised metric */
        in_addr_t       rt_mask;
        uint32_t        rt_seqno;       /* when last changed */
        uint16_t        rt_state;
#define RS_IF           0x0001  /* for network interface */
#define RS_NET_INT      0x0002  /* authority route */
#define RS_NET_SYN      0x0004  /* fake net route for subnet */
#define RS_NO_NET_SYN (RS_LOCAL | RS_IF)
#define RS_SUBNET       0x0008  /* subnet route from any source */
#define RS_LOCAL        0x0010  /* loopback for pt-to-pt */
#define RS_MHOME        0x0020  /* from -m */
#define RS_STATIC       0x0040  /* from the kernel */
#define RS_NOPROPAGATE  0x0080  /* route which must not be propagated */
#define RS_BADIF        0x0100  /* route through dead ifp */

        uint8_t         rt_poison_metric;       /* to notice maximum recently */
        uint_t          rt_num_spares;
        struct rt_spare  *rt_spares;
};
#define rt_dst      rt_dst_sock.sin_addr.s_addr
#define rt_ifp      rt_spares[0].rts_ifp
#define rt_gate     rt_spares[0].rts_gate
#define rt_router   rt_spares[0].rts_router
#define rt_metric   rt_spares[0].rts_metric
#define rt_tag      rt_spares[0].rts_tag
#define rt_time     rt_spares[0].rts_time
#define rt_de_ag    rt_spares[0].rts_de_ag

#define HOST_MASK       0xffffffffU
#define RT_ISHOST(rt)   ((rt)->rt_mask == HOST_MASK)

/*
 * Determine if a route should be aged.  Age all routes that are:
 * Not from -g, -m, nor static routes from the kernel
 * not unbroken interface routes but not broken interfaces
 * not learnt from RDISC or from /etc/gateways
 * nor non-passive, remote interfaces that are not aliases
 * (i.e. remote & metric=0)
 */
#define AGE_RT(rt_state, rts_origin, ifp) \
        ((!((rt_state) & (RS_MHOME | RS_STATIC | RS_NET_SYN)) && \
        (rts_origin != RO_RDISC) && \
        (rts_origin != RO_FILE)) && \
        (!((rt_state) & RS_IF) || \
            (ifp) == NULL || \
                (((ifp)->int_state & IS_REMOTE) && \
                    !((ifp)->int_state & IS_PASSIVE))))

/*
 * true if A is better than B
 * Better if
 *      - A is not a poisoned route
 *      - and A is not stale
 *      - and either:
 *              - A has a shorter path
 *              - or the router is speaking for itself
 *              - or B has the same metric and isn't stale
 *              - or A is a host route advertised by a system for itself
 */
#define BETTER_LINK(rt, A, B) ((A)->rts_metric < HOPCNT_INFINITY &&     \
                        now_stale <= (A)->rts_time &&           \
                        ((A)->rts_metric < (B)->rts_metric ||   \
                        ((A)->rts_gate == (A)->rts_router &&    \
                        (B)->rts_gate != (B)->rts_router) || \
                        ((A)->rts_metric == (B)->rts_metric &&  \
                                now_stale > (B)->rts_time) ||   \
                        (RT_ISHOST(rt) &&                       \
                                (rt)->rt_dst == (A)->rts_router &&      \
                                (A)->rts_metric == (B)->rts_metric)))

struct hlinkage {
        void *hl_next;
        void **hl_prev;
};

/*
 * A "physical_interface" represents the actual hardware.  It is also
 * a container for a list of the interfaces that have the same ifIndex
 * number.  This will consist of zero or one "main" interface plus
 * zero or more IS_ALIAS interfaces.
 */
struct physical_interface {
        struct hlinkage phyi_link;
        uint32_t phyi_index;
        struct interface *phyi_interface;
        struct phyi_data {
                uint32_t        ipackets;       /* previous network stats */
                uint32_t        ierrors;
                uint32_t        opackets;
                uint32_t        oerrors;
                time_t  ts;             /* timestamp on network stats */
        } phyi_data;
        char phyi_name[IF_NAME_LEN+1];
};

/*
 * An "interface" is similar to a kernel ifnet structure, except it also
 * handles "logical" or "IS_REMOTE" interfaces (remote gateways).
 */
struct interface {
        /*
         * We keep interfaces in a variety of data structures to
         * optimize for different types of searches.
         */
        struct hlinkage int_link;
#define int_next        int_link.hl_next
        struct hlinkage int_ahash;      /* by address */
        struct hlinkage int_bhash;      /* by broadcast address */
        struct hlinkage int_nhash;      /* by name */
        struct hlinkage int_ilist;      /* ifIndex list */
        struct physical_interface *int_phys;    /* backpointer */
        char            int_name[IF_NAME_LEN+1];
        in_addr_t       int_addr;       /* address on this host (net order) */
        in_addr_t       int_brdaddr;    /* broadcast address (n) */
        in_addr_t       int_dstaddr;    /* other end of pt-to-pt link (n) */
        in_addr_t       int_net;        /* working network # (host order) */
        in_addr_t       int_mask;       /* working net mask (host order) */
        in_addr_t       int_ripv1_mask; /* for inferring a mask (n) */
        in_addr_t       int_std_addr;   /* class A/B/C address (n) */
        in_addr_t       int_std_net;    /* class A/B/C network (h) */
        in_addr_t       int_std_mask;   /* class A/B/C netmask (h) */
        in_addr_t       int_ripout_addr; /* RIP pkts sent to this addr */
        uint64_t        int_if_flags;   /* some bits copied from kernel */
        uint32_t        int_state;
        time_t          int_act_time;   /* last thought healthy (IS_REMOTE) */
        time_t          int_query_time; /* last query (IS_REMOTE) */
        uint32_t        int_transitions; /* times gone up-down */
        uint8_t         int_metric;
        uint8_t         int_d_metric;   /* for faked default route */
#define MAX_AUTH_KEYS 5
        struct auth {                   /* authentication info */
                time_t          start, end;
                uint16_t        type;
                /*
                 * Although the following key is just an array of bytes,
                 * in.routed is currently limited to ascii characters
                 * because of its configuration syntax and parsing.
                 */
                uint8_t         key[RIP_AUTH_PW_LEN +1];
                uint8_t         keyid;
                uint8_t         warnedflag;
        } int_auth[MAX_AUTH_KEYS];
        /* router discovery parameters */
        int             int_rdisc_pref; /* signed preference to advertise */
        uint32_t        int_rdisc_int;  /* MaxAdvertiseInterval */
        uint32_t        int_rdisc_cnt;
        struct timeval int_rdisc_timer;
};

/* bits in int_state */
#define IS_ALIAS            0x00000001  /* interface alias */
#define IS_SUBNET           0x00000002  /* interface on subnetted network */
#define IS_REMOTE           0x00000004  /* interface is not on this machine */
#define IS_PASSIVE          0x00000008  /* remote and does not do RIP */
#define IS_EXTERNAL         0x00000010  /* handled by EGP or something */
#define IS_CHECKED          0x00000020  /* still exists */
#define IS_ALL_HOSTS        0x00000040  /* in INADDR_ALLHOSTS_GROUP */
#define IS_ALL_ROUTERS      0x00000080  /* in INADDR_ALLROUTERS_GROUP */
#define IS_DISTRUST         0x00000100  /* ignore untrusted routers */
#define IS_REDIRECT_OK      0x00000200  /* accept ICMP redirects */
#define IS_BROKE            0x00000400  /* seems to be broken */
#define IS_SICK             0x00000800  /* seems to be broken */
#define IS_DUP              0x00001000  /* duplicates another interface */
#define IS_NEED_NET_SYN     0x00002000  /* need RS_NET_SYN route */
#define IS_NO_AG            0x00004000  /* do not aggregate subnets */
#define IS_NO_SUPER_AG      0x00008000  /* do not aggregate networks */
#define IS_NO_RIPV1_IN      0x00010000  /* no RIPv1 input at all */
#define IS_NO_RIPV2_IN      0x00020000  /* no RIPv2 input at all */
#define IS_NO_RIP_IN    (IS_NO_RIPV1_IN | IS_NO_RIPV2_IN)
#define IS_RIP_IN_OFF(s) (((s) & IS_NO_RIP_IN) == IS_NO_RIP_IN)
#define IS_NO_RIPV1_OUT     0x00040000  /* no RIPv1 output at all */
#define IS_NO_RIPV2_OUT     0x00080000  /* no RIPv2 output at all */
#define IS_NO_RIP_OUT   (IS_NO_RIPV1_OUT | IS_NO_RIPV2_OUT)
#define IS_NO_RIP       (IS_NO_RIP_OUT | IS_NO_RIP_IN)
#define IS_RIP_OUT_OFF(s) (((s) & IS_NO_RIP_OUT) == IS_NO_RIP_OUT)
#define IS_RIP_OFF(s)   (((s) & IS_NO_RIP) == IS_NO_RIP)
#define IS_NO_RIP_MCAST     0x00100000  /* broadcast RIPv2 */
#define IS_NO_ADV_IN        0x00200000  /* do not listen to advertisements */
#define IS_NO_SOL_OUT       0x00400000  /* send no solicitations */
#define IS_SOL_OUT          0x00800000  /* send solicitations */
#define GROUP_IS_SOL_OUT (IS_SOL_OUT | IS_NO_SOL_OUT)
#define IS_NO_ADV_OUT       0x01000000  /* do not advertise rdisc */
#define IS_ADV_OUT          0x02000000  /* advertise rdisc */
#define GROUP_IS_ADV_OUT (IS_NO_ADV_OUT | IS_ADV_OUT)
#define IS_BCAST_RDISC      0x04000000  /* broadcast instead of multicast */
#define IS_NO_RDISC     (IS_NO_ADV_IN | IS_NO_SOL_OUT | IS_NO_ADV_OUT)
#define IS_PM_RDISC         0x08000000  /* poor-man's router discovery */
#define IS_NO_HOST          0x10000000  /* disallow host routes */
#define IS_SUPPRESS_RDISC   0x20000000  /* don't send rdisc advs */
#define IS_FLUSH_RDISC      0x40000000  /* flush client rdisc caches */

/*
 * passive interfaces are added through gwkludge
 */
#define IS_PASSIVE_IFP(ifp) \
        (((ifp)->int_state & (IS_REMOTE|IS_PASSIVE|IS_EXTERNAL|IS_ALIAS)) == \
            (IS_REMOTE|IS_PASSIVE))

/*
 * Is an IP interface up?
 */
#define IS_IFF_UP(f)    (((f) & (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING))

/*
 * This defines interfaces that we should not use for advertising or
 * soliciting routes by way of RIP and rdisc.  Interfaces marked this
 * way do not count for purposes of determining how many interfaces
 * this router has.
 */
#define IS_IFF_QUIET(f) ((f) & (IFF_LOOPBACK|IFF_NORTEXCH|IFF_NOXMIT))

/*
 * This defines interfaces that we can use for advertising routes by way of
 * RIP and rdisc.
 */
#define IS_IFF_ROUTING(f) \
        (((f) & IFF_ROUTER) && !((f) & (IFF_NORTEXCH|IFF_NOXMIT)))

/* Information for aggregating routes */
#define NUM_AG_SLOTS    32
struct ag_info {
        struct ag_info *ag_fine;        /* slot with finer netmask */
        struct ag_info *ag_cors;        /* more coarse netmask */
        in_addr_t       ag_dst_h;       /* destination in host byte order */
        in_addr_t       ag_mask;
        in_addr_t       ag_gate;
        struct interface *ag_ifp;
        in_addr_t       ag_nhop;
        uint8_t         ag_metric;      /* metric to be advertised */
        uint8_t         ag_pref;        /* aggregate based on this */
        uint32_t        ag_seqno;
        uint16_t        ag_tag;
        uint16_t        ag_state;
#define     AGS_SUPPRESS    0x001       /* combine with coarser mask */
#define     AGS_AGGREGATE   0x002       /* synthesize combined routes */
#define     AGS_REDUN0      0x004       /* redundant, finer routes output */
#define     AGS_REDUN1      0x008
#define     AG_IS_REDUN(state) (((state) & (AGS_REDUN0 | AGS_REDUN1)) \
                                == (AGS_REDUN0 | AGS_REDUN1))
#define     AGS_GATEWAY     0x010       /* tell kernel RTF_GATEWAY */
#define     AGS_IF          0x020       /* for an interface */
#define     AGS_RIPV2       0x040       /* send only as RIPv2 */
#define     AGS_FINE_GATE   0x080       /* ignore differing ag_gate when */
                                        /* this has the finer netmask */
#define     AGS_CORS_GATE   0x100       /* ignore differing gate when this */
                                        /* has the coarser netmasks */
#define     AGS_SPLIT_HZ    0x200       /* suppress for split horizon */
#define     AGS_PASSIVE    0x400        /* passive "remote" interface route */
#define     AGS_FILE        0x800       /* from /etc/gateways */

        /* some bits are set if they are set on either route */
#define     AGS_AGGREGATE_EITHER (AGS_RIPV2 | AGS_GATEWAY | \
                                        AGS_SUPPRESS | AGS_CORS_GATE)
};

struct khash {
        struct khash *k_next;
        in_addr_t       k_dst;
        in_addr_t       k_mask;
        in_addr_t       k_gate;
        struct interface *k_ifp;
        short           k_metric;
        ushort_t        k_state;        /* KS_* */
        time_t  k_keep;
        time_t  k_redirect_time;        /* when redirected route 1st seen */
};

/* bit flags for k_state; shared between table.c and trace.c */
#define     KS_NEW      0x0001
#define     KS_DELETE   0x0002          /* need to delete the route */
#define     KS_ADD      0x0004          /* add to the kernel */
#define     KS_CHANGE   0x0008          /* tell kernel to change the route */
#define     KS_DEL_ADD  0x0010          /* delete & add to change the kernel */
#define     KS_STATIC   0x0020          /* Static flag in kernel */
#define     KS_GATEWAY  0x0040          /* G flag in kernel */
#define     KS_DYNAMIC  0x0080          /* result of redirect */
#define     KS_DELETED  0x0100          /* already deleted from kernel */
#define     KS_PRIVATE  0x0200          /* Private flag in kernel */
#define     KS_CHECK    0x0400
#define     KS_IF       0x0800          /* interface route */
#define     KS_PASSIVE  0x1000          /* passive remote interface route */
#define     KS_DEPRE_IF 0x2000          /* IPMP deprecated interface route */
#define     KS_FILE     0x4000          /* from /etc/gateways */

/* default router structure */
struct dr {                     /* accumulated advertisements */
        struct interface *dr_ifp;
        in_addr_t       dr_gate;        /* gateway */
        time_t          dr_ts;          /* when received */
        time_t          dr_life;        /* lifetime in host byte order */
        uint32_t        dr_recv_pref;   /* received but biased preference */
        uint32_t        dr_pref;        /* preference adjusted by metric */
        uint32_t        dr_flags;
#define DR_CHANGED      1               /* received new info for known dr */
};

/* parameters for interfaces */
struct parm {
        struct parm     *parm_next;
        in_addr_t       parm_net;
        in_addr_t       parm_mask;
        in_addr_t       parm_ripout_addr;
        uint32_t        parm_int_state;
        int32_t         parm_rdisc_pref;        /* signed IRDP preference */
        uint32_t        parm_rdisc_int;         /* IRDP advertising interval */
        struct auth     parm_auth[MAX_AUTH_KEYS];
        char            parm_name[IF_NAME_LEN+1];
        uint8_t         parm_d_metric;
};

/* authority for internal networks */
extern struct intnet {
        struct intnet *intnet_next;
        in_addr_t       intnet_addr;    /* network byte order */
        in_addr_t       intnet_mask;
        int8_t          intnet_metric;
} *intnets;

/*
 * Defined RIPv1 netmasks.  These come from ripv1_mask entries in
 * /etc/gateways of the form:
 *
 * ripv1_mask=<net>/<match>,<mask>
 *
 * The intended use of these structures is to give RIPv1 destinations which
 * are in <net>/<match> a netmask of <mask>, where <mask> > <match>.
 */
extern struct r1net {
        struct r1net *r1net_next;
        in_addr_t       r1net_net;      /* host order */
        in_addr_t       r1net_match;
        in_addr_t       r1net_mask;
} *r1nets;

/* trusted routers */
extern struct tgate {
        struct tgate *tgate_next;
        in_addr_t       tgate_addr;
#define     MAX_TGATE_NETS 32
        struct tgate_net {
            in_addr_t   net;    /* host order */
            in_addr_t   mask;
        } tgate_nets[MAX_TGATE_NETS];
} *tgates;

enum output_type {OUT_QUERY, OUT_UNICAST, OUT_BROADCAST, OUT_MULTICAST,
        NO_OUT_MULTICAST, NO_OUT_RIPV2};

/* common output buffers */
extern struct ws_buf {
        struct rip      *buf;
        struct netinfo  *n;
        struct netinfo  *base;
        struct netinfo  *lim;
        enum output_type type;
} v12buf;

extern int      stopint;                /* !=0 to stop in.routed */

extern int      rip_sock;               /* RIP socket */
extern struct interface *rip_sock_interface; /* current output interface */
extern int      rt_sock;                /* routing socket */
extern int      rdisc_sock;             /* router-discovery raw socket */
extern int      rdisc_mib_sock;         /* AF_UNIX mib info socket */

extern boolean_t rip_enabled;           /* is rip on? */
extern boolean_t supplier;              /* process should supply updates */
extern boolean_t supplier_set;          /* -s or -q requested */
extern boolean_t save_space;            /* -S option 1=treat all RIP speakers */
extern boolean_t ridhosts;              /* 1=reduce host routes */
extern boolean_t mhome;                 /* 1=want multi-homed host route */
extern boolean_t advertise_mhome;       /* 1=must continue advertising it */
extern boolean_t auth_ok;               /* 1=ignore auth if we do not care */
extern boolean_t no_install;            /* 1=don't install in kernel */

extern struct timeval clk;              /* system clock's idea of time */
extern struct timeval epoch;            /* system clock when started */
extern struct timeval now;              /* current idea of time */
extern time_t   now_stale;
extern time_t   now_expire;
extern time_t   now_garbage;

extern struct timeval age_timer;        /* next check of old routes */
extern struct timeval no_flash;         /* inhibit flash update until then */
extern struct timeval rdisc_timer;      /* next advert. or solicitation */
extern boolean_t rdisc_ok;                      /* using solicited route */

extern struct timeval ifscan_timer;     /* time to check interfaces */

extern in_addr_t loopaddr;              /* our address on loopback */
extern uint_t   tot_interfaces;         /* # of remote and local interfaces */
extern uint_t   rip_interfaces;         /* # of interfaces doing RIP */
extern uint_t   ripout_interfaces;      /* # of interfaces advertising RIP */
extern uint_t   fwd_interfaces;         /* # of interfaces ip_forwarding=1 */
extern struct interface *ifnet;         /* all interfaces */
extern size_t hash_table_sizes[];       /* list of primes for hash tables */
extern boolean_t        have_ripv1_out; /* have a RIPv1 interface */
extern boolean_t        need_flash;     /* flash update needed */
extern struct timeval   need_kern;      /* need to update kernel table */
extern uint32_t         update_seqno;   /* a route has changed */
extern struct interface dummy_ifp;      /* wildcard interface */

extern int      tracelevel, new_tracelevel;
#define MAX_TRACELEVEL 5
#define TRACERTS (tracelevel >= 5)      /* log routing socket contents */
#define TRACEKERNEL (tracelevel >= 4)   /* log kernel changes */
#define TRACECONTENTS (tracelevel >= 3) /* display packet contents */
#define TRACEPACKETS (tracelevel >= 2)  /* note packets */
#define TRACEACTIONS (tracelevel != 0)
extern FILE     *ftrace;                /* output trace file */
extern char inittracename[MAXPATHLEN+1];

extern struct radix_node_head *rhead;

extern void fix_sock(int, const char *);
extern void fix_select(void);
extern void rip_off(void);
extern void rip_on(struct interface *);

extern void bufinit(void);
extern int  output(enum output_type, struct sockaddr_in *,
    struct interface *, struct rip *, int);
extern void clr_ws_buf(struct ws_buf *, struct auth *);
extern void rip_query(void);
extern void rip_bcast(int);
extern void supply(struct sockaddr_in *, struct interface *,
    enum output_type, int, int, boolean_t);

extern void     msglog(const char *, ...);
extern void     writelog(int, const char *, ...);
struct msg_limit {
        time_t  reuse;
        struct msg_sub {
                in_addr_t addr;
                time_t  until;
#define MSG_SUBJECT_N 8
        } subs[MSG_SUBJECT_N];
};
extern void     msglim(struct msg_limit *, in_addr_t, const char *, ...);
#define LOGERR(msg) msglog(msg ": %s", rip_strerror(errno))
extern void     logbad(boolean_t, const char *, ...);
#define BADERR(dump, msg) logbad(dump, msg ": %s", rip_strerror(errno))
#ifdef DEBUG
#define DBGERR(dump, msg) BADERR(dump, msg)
#else
#define DBGERR(dump, msg) LOGERR(msg)
#endif
extern  char    *naddr_ntoa(in_addr_t);
extern const char *saddr_ntoa(struct sockaddr_storage *);
extern const char *rip_strerror(int errnum);
extern char *if_bit_string(uint_t, boolean_t);

extern void     *rtmalloc(size_t, const char *);
extern void     timevaladd(struct timeval *, struct timeval *);
extern void     intvl_random(struct timeval *, ulong_t, ulong_t);
extern boolean_t        getnet(const char *, in_addr_t *, in_addr_t *);
extern int      gethost(char *, in_addr_t *);
extern void     gwkludge(void);
extern const char *parse_parms(char *, boolean_t);
extern const char *insert_parm(struct parm *);
extern void     get_parms(struct interface *);

extern void     lastlog(void);
extern void     trace_close(int);
extern void     set_tracefile(const char *, const char *, int);
extern void     tracelevel_msg(const char *, int);
extern void     trace_off(const char *, ...);
extern void     set_tracelevel(void);
extern void     trace_flush(void);
extern void     trace_misc(const char *, ...);
extern void     trace_act(const char *, ...);
extern void     trace_pkt(const char *, ...);
extern void     trace_add_del(const char *, struct rt_entry *);
extern void     trace_change(struct rt_entry *, uint16_t, struct rt_spare *,
    const char *);
extern void     trace_if(const char *, struct interface *);
extern void     trace_khash(const struct khash *);
extern void     trace_dr(const struct dr *);
extern void     trace_upslot(struct rt_entry *, struct rt_spare *,
    struct rt_spare *);
extern void     trace_rip(const char *, const char *, struct sockaddr_in *,
    struct interface *, struct rip *, int);
extern char     *addrname(in_addr_t, in_addr_t, int);
extern char     *rtname(in_addr_t, in_addr_t, in_addr_t);

extern void     rdisc_age(in_addr_t);
extern void     set_rdisc_mg(struct interface *, int);
extern void     set_supplier(void);
extern void     if_bad_rdisc(struct interface *);
extern void     if_rewire_rdisc(struct interface *, struct interface *);
extern void     if_ok_rdisc(struct interface *);
extern int      read_rip(void);
extern void     input_route(in_addr_t, in_addr_t, struct rt_spare *,
    struct netinfo *, uint16_t);
extern void     read_rt(void);
extern void     read_d(void);
extern void     process_d_mib_sock(void);
extern void     rdisc_adv(boolean_t);
extern void     rdisc_sol(void);
extern struct interface *receiving_interface(struct msghdr *, boolean_t);
extern void     *find_ancillary(struct msghdr *, int);
extern boolean_t        should_supply(struct interface *);
extern void     rdisc_dump(void);
extern void     rdisc_suppress(struct interface *);
extern void     rdisc_restore(struct interface *);

extern void age_peer_info(void);

extern void     sigtrace_more(int);
extern void     sigtrace_less(int);
extern void     sigtrace_dump(int);

extern void     sync_kern(void);
extern void     age(in_addr_t);
extern void     kern_dump(void);
extern void     kern_flush_ifp(struct interface *);
extern void     kern_rewire_ifp(struct interface *, struct interface *);

extern void     ag_flush(in_addr_t, in_addr_t, void (*)(struct ag_info *));
extern void     ag_check(in_addr_t, in_addr_t, in_addr_t, struct interface *,
    in_addr_t, uint8_t, uint8_t, uint32_t, uint16_t, uint16_t,
    void (*)(struct ag_info *));
extern void     del_static(in_addr_t, in_addr_t, in_addr_t,
    struct interface *, int);
extern void     del_redirects(in_addr_t, time_t);
extern struct rt_entry *rtget(in_addr_t, in_addr_t);
extern struct rt_entry *rtfind(in_addr_t);
extern void     rtinit(void);
extern void     rtadd(in_addr_t, in_addr_t, uint16_t, struct rt_spare *);
extern void     rtchange(struct rt_entry *, uint16_t, struct rt_spare *,
    char *);
extern void     rtdelete(struct rt_entry *);
extern void     rts_delete(struct rt_entry *, struct rt_spare *);
extern void     rtbad_sub(struct rt_entry *, struct interface *);
extern void     rtswitch(struct rt_entry *, struct rt_spare *);

#define S_ADDR(x)       (((struct sockaddr_in *)(x))->sin_addr.s_addr)
#define INFO_DST(I)     ((I)->rti_info[RTAX_DST])
#define INFO_GATE(I)    ((I)->rti_info[RTAX_GATEWAY])
#define INFO_MASK(I)    ((I)->rti_info[RTAX_NETMASK])
#define INFO_AUTHOR(I)  ((I)->rti_info[RTAX_AUTHOR])

struct rewire_data {
        struct interface *if_old;
        struct interface *if_new;
        int metric_delta;
};

extern char *qstring(const uchar_t *, int);
extern in_addr_t std_mask(in_addr_t);
extern int parse_quote(char **, const char *, char *, char *, int);
extern in_addr_t ripv1_mask_net(in_addr_t, const struct interface *);
extern in_addr_t ripv1_mask_host(in_addr_t, const struct interface *);
#define on_net(a, net, mask)    (((ntohl(a) ^ (net)) & (mask)) == 0)
extern boolean_t check_dst(in_addr_t);
extern boolean_t remote_address_ok(struct interface *, in_addr_t);
extern struct interface *check_dup(const char *, in_addr_t, in_addr_t,
    in_addr_t, uint64_t, boolean_t);
extern boolean_t check_remote(struct interface *);
extern void iftbl_alloc(void);
extern void ifscan(void);
extern int walk_bad(struct radix_node *, void *);
extern int walk_rewire(struct radix_node *, void *);
extern void if_ok(struct interface *, const char *, boolean_t);
extern void if_sick(struct interface *, boolean_t);
extern void if_link(struct interface *, uint32_t);
extern struct interface *ifwithaddr(in_addr_t, boolean_t, boolean_t);
extern struct interface *ifwithindex(ulong_t, boolean_t);
extern struct interface *ifwithname(const char *);
extern struct physical_interface *phys_byname(const char *);
extern boolean_t addr_on_ifp(in_addr_t, struct interface *,
    struct interface **);
extern struct interface *findremoteif(in_addr_t);
extern struct interface *findifaddr(in_addr_t);
extern struct interface *iflookup(in_addr_t);
extern struct auth *find_auth(struct interface *);
extern void end_md5_auth(struct ws_buf *, struct auth *);
extern void rip_mcast_on(struct interface *);
extern void rip_mcast_off(struct interface *);
extern void trace_dump();
extern int sendtoif(int, const void *, uint_t, uint_t, struct sockaddr_in *,
    uint_t);

#ifdef  __cplusplus
}
#endif

#endif /* _DEFS_H */