/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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. 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
*
* $FreeBSD$
*/
#ifdef sgi
#ident "$FreeBSD$"
#endif
/* 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
* do not advertise if ipforwarding=0
*
* 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.
*/
#include <assert.h>
#include <stdio.h>
#include <netdb.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#ifdef sgi
#include <strings.h>
#include <bstring.h>
#endif
#include <stdarg.h>
#include <syslog.h>
#include <time.h>
#include <sys/cdefs.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <sys/socket.h>
#include <sys/queue.h>
#ifdef sgi
#define _USER_ROUTE_TREE
#include <net/radix.h>
#else
#include "radix.h"
#define UNUSED __attribute__((unused))
#define PATTRIB(f,l) __attribute__((format (printf,f,l)))
#endif
#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>
#ifndef __RCSID
#define __RCSID(_s) static const char rcsid[] UNUSED = _s
#endif
#ifndef __COPYRIGHT
#define __COPYRIGHT(_s) static const char copyright[] UNUSED = _s
#endif
/* Type of an IP address.
* Some systems do not like to pass structures, so do not use in_addr.
* Some systems think a long has 64 bits, which would be a gross waste.
* So define it here so it can be changed for the target system.
* It should be defined somewhere netinet/in.h, but it is not.
*/
#ifdef sgi
#define naddr u_int32_t
#elif defined (__NetBSD__)
#define naddr u_int32_t
#define _HAVE_SA_LEN
#define _HAVE_SIN_LEN
#else
#define naddr u_long
#define _HAVE_SA_LEN
#define _HAVE_SIN_LEN
#endif
#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. These must be less than STALE_TIME.
*/
#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 */
#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 */
#ifndef sgi
#define INADDR_ALLROUTERS_GROUP 0xe0000002 /* 224.0.0.2 */
#endif
#define MaxMaxAdvertiseInterval 1800
#define MinMaxAdvertiseInterval 4
#define DefMaxAdvertiseInterval 600
#define MIN_PreferenceLevel 0x80000000
#define MAX_INITIAL_ADVERT_INTERVAL 16
#define MAX_INITIAL_ADVERTS 3
#define MAX_SOLICITATION_DELAY 1
#define SOLICITATION_INTERVAL 3
#define MAX_SOLICITATIONS 3
/* 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 {
char packet[OVER_MAXPACKETSIZE*2];
struct rip rip;
};
#define GNAME_LEN 64 /* assumed=64 in parms.c */
/* bigger than IFNAMSIZ, with room for "external()" or "remote()" */
#define IF_NAME_LEN (GNAME_LEN+15)
/* 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)
extern int total_routes;
/* Main, daemon routing table structure
*/
struct rt_entry {
struct radix_node rt_nodes[2]; /* radix tree glue */
u_int rt_state;
# define RS_IF 0x001 /* for network interface */
# define RS_NET_INT 0x002 /* authority route */
# define RS_NET_SYN 0x004 /* fake net route for subnet */
# define RS_NO_NET_SYN (RS_LOCAL | RS_LOCAL | RS_IF)
# define RS_SUBNET 0x008 /* subnet route from any source */
# define RS_LOCAL 0x010 /* loopback for pt-to-pt */
# define RS_MHOME 0x020 /* from -m */
# define RS_STATIC 0x040 /* from the kernel */
# define RS_RDISC 0x080 /* from router discovery */
struct sockaddr_in rt_dst_sock;
naddr rt_mask;
struct rt_spare {
struct interface *rts_ifp;
naddr rts_gate; /* forward packets here */
naddr rts_router; /* on the authority of this router */
char rts_metric;
u_short rts_tag;
time_t rts_time; /* timer to junk stale routes */
u_int rts_de_ag; /* de-aggregation level */
#define NUM_SPARES 4
} rt_spares[NUM_SPARES];
u_int rt_seqno; /* when last changed */
char rt_poison_metric; /* to notice maximum recently */
time_t rt_poison_time; /* advertised metric */
};
#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 0xffffffff
#define RT_ISHOST(rt) ((rt)->rt_mask == HOST_MASK)
/* age all routes that
* are not from -g, -m, or static routes from the kernel
* not unbroken interface routes
* but not broken interfaces
* nor non-passive, remote interfaces that are not aliases
* (i.e. remote & metric=0)
*/
#define AGE_RT(rt_state,ifp) (0 == ((rt_state) & (RS_MHOME | RS_STATIC \
| RS_NET_SYN | RS_RDISC)) \
&& (!((rt_state) & RS_IF) \
|| (ifp) == 0 \
|| (((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 A has a shorter path
* - or is the router speaking for itself
* - or the current route is equal but stale
* - or it 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)))
/* An "interface" is similar to a kernel ifnet structure, except it also
* handles "logical" or "IS_REMOTE" interfaces (remote gateways).
*/
struct interface {
LIST_ENTRY(interface) int_list;
LIST_ENTRY(interface) remote_list;
struct interface *int_ahash, **int_ahash_prev;
struct interface *int_bhash, **int_bhash_prev;
struct interface *int_nhash, **int_nhash_prev;
char int_name[IF_NAME_LEN+1];
u_short int_index;
naddr int_addr; /* address on this host (net order) */
naddr int_brdaddr; /* broadcast address (n) */
naddr int_dstaddr; /* other end of pt-to-pt link (n) */
naddr int_net; /* working network # (host order)*/
naddr int_mask; /* working net mask (host order) */
naddr int_ripv1_mask; /* for inferring a mask (n) */
naddr int_std_addr; /* class A/B/C address (n) */
naddr int_std_net; /* class A/B/C network (h) */
naddr int_std_mask; /* class A/B/C netmask (h) */
int int_rip_sock; /* for queries */
int int_if_flags; /* some bits copied from kernel */
u_int int_state;
time_t int_act_time; /* last thought healthy */
time_t int_query_time;
u_short int_transitions; /* times gone up-down */
char int_metric;
u_char int_d_metric; /* for faked default route */
u_char int_adj_inmetric; /* adjust advertised metrics */
u_char int_adj_outmetric; /* instead of interface metric */
struct int_data {
u_int ipackets; /* previous network stats */
u_int ierrors;
u_int opackets;
u_int oerrors;
#ifdef sgi
u_int odrops;
#endif
time_t ts; /* timestamp on network stats */
} int_data;
# define MAX_AUTH_KEYS 5
struct auth { /* authentication info */
u_int16_t type;
u_char key[RIP_AUTH_PW_LEN];
u_char keyid;
time_t start, end;
} int_auth[MAX_AUTH_KEYS];
/* router discovery parameters */
int int_rdisc_pref; /* signed preference to advertise */
int int_rdisc_int; /* MaxAdvertiseInterval */
int int_rdisc_cnt;
struct timeval int_rdisc_timer;
};
/* bits in int_state */
#define IS_ALIAS 0x0000001 /* interface alias */
#define IS_SUBNET 0x0000002 /* interface on subnetted network */
#define IS_REMOTE 0x0000004 /* interface is not on this machine */
#define IS_PASSIVE 0x0000008 /* remote and does not do RIP */
#define IS_EXTERNAL 0x0000010 /* handled by EGP or something */
#define IS_CHECKED 0x0000020 /* still exists */
#define IS_ALL_HOSTS 0x0000040 /* in INADDR_ALLHOSTS_GROUP */
#define IS_ALL_ROUTERS 0x0000080 /* in INADDR_ALLROUTERS_GROUP */
#define IS_DISTRUST 0x0000100 /* ignore untrusted routers */
#define IS_REDIRECT_OK 0x0000200 /* accept ICMP redirects */
#define IS_BROKE 0x0000400 /* seems to be broken */
#define IS_SICK 0x0000800 /* seems to be broken */
#define IS_DUP 0x0001000 /* has a duplicate address */
#define IS_NEED_NET_SYN 0x0002000 /* need RS_NET_SYN route */
#define IS_NO_AG 0x0004000 /* do not aggregate subnets */
#define IS_NO_SUPER_AG 0x0008000 /* do not aggregate networks */
#define IS_NO_RIPV1_IN 0x0010000 /* no RIPv1 input at all */
#define IS_NO_RIPV2_IN 0x0020000 /* 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 0x0040000 /* no RIPv1 output at all */
#define IS_NO_RIPV2_OUT 0x0080000 /* 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 0x0100000 /* broadcast RIPv2 */
#define IS_NO_ADV_IN 0x0200000 /* do not listen to advertisements */
#define IS_NO_SOL_OUT 0x0400000 /* send no solicitations */
#define IS_SOL_OUT 0x0800000 /* send solicitations */
#define GROUP_IS_SOL_OUT (IS_SOL_OUT | IS_NO_SOL_OUT)
#define IS_NO_ADV_OUT 0x1000000 /* do not advertise rdisc */
#define IS_ADV_OUT 0x2000000 /* advertise rdisc */
#define GROUP_IS_ADV_OUT (IS_NO_ADV_OUT | IS_ADV_OUT)
#define IS_BCAST_RDISC 0x4000000 /* broadcast instead of multicast */
#define IS_NO_RDISC (IS_NO_ADV_IN | IS_NO_SOL_OUT | IS_NO_ADV_OUT)
#define IS_PM_RDISC 0x8000000 /* poor-man's router discovery */
#define iff_up(f) ((f) & IFF_UP)
LIST_HEAD(ifhead, interface);
/* 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 */
naddr ag_dst_h; /* destination in host byte order */
naddr ag_mask;
naddr ag_gate;
naddr ag_nhop;
char ag_metric; /* metric to be advertised */
char ag_pref; /* aggregate based on this */
u_int ag_seqno;
u_short ag_tag;
u_short 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 */
/* some bits are set if they are set on either route */
#define AGS_AGGREGATE_EITHER (AGS_RIPV2 | AGS_GATEWAY | \
AGS_SUPPRESS | AGS_CORS_GATE)
};
/* parameters for interfaces */
struct parm {
struct parm *parm_next;
char parm_name[IF_NAME_LEN+1];
naddr parm_net;
naddr parm_mask;
u_char parm_d_metric;
u_char parm_adj_inmetric;
char parm_adj_outmetric;
u_int parm_int_state;
int parm_rdisc_pref; /* signed IRDP preference */
int parm_rdisc_int; /* IRDP advertising interval */
struct auth parm_auth[MAX_AUTH_KEYS];
};
/* authority for internal networks */
extern struct intnet {
struct intnet *intnet_next;
naddr intnet_addr; /* network byte order */
naddr intnet_mask;
char intnet_metric;
} *intnets;
/* defined RIPv1 netmasks */
extern struct r1net {
struct r1net *r1net_next;
naddr r1net_net; /* host order */
naddr r1net_match;
naddr r1net_mask;
} *r1nets;
/* trusted routers */
extern struct tgate {
struct tgate *tgate_next;
naddr tgate_addr;
#define MAX_TGATE_NETS 32
struct tgate_net {
naddr net; /* host order */
naddr 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 pid_t mypid;
extern naddr myaddr; /* main address of this system */
extern int stopint; /* !=0 to stop */
extern int rip_sock; /* RIP socket */
extern const struct interface *rip_sock_mcast; /* current multicast interface */
extern int rt_sock; /* routing socket */
extern int rt_sock_seqno;
extern int rdisc_sock; /* router-discovery raw socket */
extern int supplier; /* process should supply updates */
extern int supplier_set; /* -s or -q requested */
extern int ridhosts; /* 1=reduce host routes */
extern int mhome; /* 1=want multi-homed host route */
extern int advertise_mhome; /* 1=must continue advertising it */
extern int auth_ok; /* 1=ignore auth if we do not care */
extern int insecure; /* Reply to special queries or not */
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 int rdisc_ok; /* using solicited route */
extern struct timeval ifinit_timer; /* time to check interfaces */
extern naddr loopaddr; /* our address on loopback */
extern int tot_interfaces; /* # of remote and local interfaces */
extern int rip_interfaces; /* # of interfaces doing RIP */
extern struct ifhead ifnet; /* all interfaces */
extern struct ifhead remote_if; /* remote interfaces */
extern int have_ripv1_out; /* have a RIPv1 interface */
extern int need_flash; /* flash update needed */
extern struct timeval need_kern; /* need to update kernel table */
extern u_int update_seqno; /* a route has changed */
extern int tracelevel, new_tracelevel;
#define MAX_TRACELEVEL 4
#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[PATH_MAX];
extern struct radix_node_head *rhead;
#ifdef sgi
/* Fix conflicts */
#define dup2(x,y) BSDdup2(x,y)
#endif /* sgi */
void fix_sock(int, const char *);
void fix_select(void);
void rip_off(void);
void rip_on(struct interface *);
void bufinit(void);
int output(enum output_type, struct sockaddr_in *,
struct interface *, struct rip *, int);
void clr_ws_buf(struct ws_buf *, struct auth *);
void rip_query(void);
void rip_bcast(int);
void supply(struct sockaddr_in *, struct interface *,
enum output_type, int, int, int);
void msglog(const char *, ...) PATTRIB(1,2);
struct msg_limit {
time_t reuse;
struct msg_sub {
naddr addr;
time_t until;
# define MSG_SUBJECT_N 8
} subs[MSG_SUBJECT_N];
};
void msglim(struct msg_limit *, naddr,
const char *, ...) PATTRIB(3,4);
#define LOGERR(msg) msglog(msg ": %s", strerror(errno))
void logbad(int, const char *, ...) PATTRIB(2,3);
#define BADERR(dump,msg) logbad(dump,msg ": %s", strerror(errno))
#ifdef DEBUG
#define DBGERR(dump,msg) BADERR(dump,msg)
#else
#define DBGERR(dump,msg) LOGERR(msg)
#endif
char *naddr_ntoa(naddr);
const char *saddr_ntoa(struct sockaddr *);
void *rtmalloc(size_t, const char *);
void timevaladd(struct timeval *, struct timeval *);
void intvl_random(struct timeval *, u_long, u_long);
int getnet(char *, naddr *, naddr *);
int gethost(char *, naddr *);
void gwkludge(void);
const char *parse_parms(char *, int);
const char *check_parms(struct parm *);
void get_parms(struct interface *);
void lastlog(void);
void trace_close(int);
void set_tracefile(const char *, const char *, int);
void tracelevel_msg(const char *, int);
void trace_off(const char*, ...) PATTRIB(1,2);
void set_tracelevel(void);
void trace_flush(void);
void trace_misc(const char *, ...) PATTRIB(1,2);
void trace_act(const char *, ...) PATTRIB(1,2);
void trace_pkt(const char *, ...) PATTRIB(1,2);
void trace_add_del(const char *, struct rt_entry *);
void trace_change(struct rt_entry *, u_int, struct rt_spare *,
const char *);
void trace_if(const char *, struct interface *);
void trace_upslot(struct rt_entry *, struct rt_spare *,
struct rt_spare *);
void trace_rip(const char*, const char*, struct sockaddr_in *,
struct interface *, struct rip *, int);
char *addrname(naddr, naddr, int);
char *rtname(naddr, naddr, naddr);
void rdisc_age(naddr);
void set_rdisc_mg(struct interface *, int);
void set_supplier(void);
void if_bad_rdisc(struct interface *);
void if_ok_rdisc(struct interface *);
void read_rip(int, struct interface *);
void read_rt(void);
void read_d(void);
void rdisc_adv(void);
void rdisc_sol(void);
void sigtrace_on(int);
void sigtrace_off(int);
void flush_kern(void);
void age(naddr);
void ag_flush(naddr, naddr, void (*)(struct ag_info *));
void ag_check(naddr, naddr, naddr, naddr, char, char, u_int,
u_short, u_short, void (*)(struct ag_info *));
void del_static(naddr, naddr, naddr, int);
void del_redirects(naddr, time_t);
struct rt_entry *rtget(naddr, naddr);
struct rt_entry *rtfind(naddr);
void rtinit(void);
void rtadd(naddr, naddr, u_int, struct rt_spare *);
void rtchange(struct rt_entry *, u_int, struct rt_spare *, char *);
void rtdelete(struct rt_entry *);
void rts_delete(struct rt_entry *, struct rt_spare *);
void rtbad_sub(struct rt_entry *);
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_IFA(I) ((I)->rti_info[RTAX_IFA])
#define INFO_AUTHOR(I) ((I)->rti_info[RTAX_AUTHOR])
#define INFO_BRD(I) ((I)->rti_info[RTAX_BRD])
void rt_xaddrs(struct rt_addrinfo *, struct sockaddr *, struct sockaddr *,
int);
naddr std_mask(naddr);
naddr ripv1_mask_net(naddr, struct interface *);
naddr ripv1_mask_host(naddr,struct interface *);
#define on_net(a,net,mask) (((ntohl(a) ^ (net)) & (mask)) == 0)
int check_dst(naddr);
struct interface *check_dup(naddr, naddr, naddr, int);
int check_remote(struct interface *);
void ifinit(void);
int walk_bad(struct radix_node *, struct walkarg *);
int if_ok(struct interface *, const char *);
void if_sick(struct interface *);
void if_link(struct interface *);
struct interface *ifwithaddr(naddr addr, int bcast, int remote);
struct interface *ifwithindex(u_short, int);
struct interface *iflookup(naddr);
struct auth *find_auth(struct interface *);
void end_md5_auth(struct ws_buf *, struct auth *);
#if defined(__FreeBSD__) || defined(__NetBSD__)
#include <md5.h>
#else
#define MD5_DIGEST_LEN 16
typedef struct {
u_int32_t state[4]; /* state (ABCD) */
u_int32_t count[2]; /* # of bits, modulo 2^64 (LSB 1st) */
unsigned char buffer[64]; /* input buffer */
} MD5_CTX;
void MD5Init(MD5_CTX*);
void MD5Update(MD5_CTX*, u_char*, u_int);
void MD5Final(u_char[MD5_DIGEST_LEN], MD5_CTX*);
#endif