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hardened/current/master
HardenedBSD/sbin/routed/defs.h
Warner Losh 51e16cb8fc sbin: Remove ancient SCCS tags. 
Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by:		Netflix
2023-11-26 22:23:29 -07:00

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/*-
* 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.
*/
/* 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>
#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>
#include "radix.h"
#define UNUSED __attribute__((unused))
#define PATTRIB(f,l) __attribute__((format (printf,f,l)))
#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 __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.
*/
#define naddr u_long
#define _HAVE_SA_LEN
#define _HAVE_SIN_LEN
#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 */
#define INADDR_ALLROUTERS_GROUP 0xe0000002 /* 224.0.0.2 */
#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;
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;
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 *);
#include <md5.h>
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