sbin/routed/defs.h

   1 /*
   2  * Copyright (c) 1983, 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)defs.h      8.1 (Berkeley) 6/5/93
  30  *
  31  * $FreeBSD: src/sbin/routed/defs.h,v 1.13 1999/09/05 17:49:11 peter Exp $
  32  */
  33
  34 /* Definitions for RIPv2 routing process.
  35  *
  36  * This code is based on the 4.4BSD `routed` daemon, with extensions to
  37  * support:
  38  *      RIPv2, including variable length subnet masks.
  39  *      Router Discovery
  40  *      aggregate routes in the kernel tables.
  41  *      aggregate advertised routes.
  42  *      maintain spare routes for faster selection of another gateway
  43  *              when the current gateway dies.
  44  *      timers on routes with second granularity so that selection
  45  *              of a new route does not wait 30-60 seconds.
  46  *      tolerance of static routes.
  47  *      tell the kernel hop counts
  48  *      do not advertise if ipforwarding=0
  49  *
  50  * The vestigial support for other protocols has been removed.  There
  51  * is no likelihood that IETF RIPv1 or RIPv2 will ever be used with
  52  * other protocols.  The result is far smaller, faster, cleaner, and
  53  * perhaps understandable.
  54  *
  55  * The accumulation of special flags and kludges added over the many
  56  * years have been simplified and integrated.
  57  */
  58
  59 #include <stdio.h>
  60 #include <netdb.h>
  61 #include <stdlib.h>
  62 #include <unistd.h>
  63 #include <errno.h>
  64 #include <string.h>
  65 #include <stdarg.h>
  66 #include <syslog.h>
  67 #include <time.h>
  68 #include <sys/cdefs.h>
  69 #include <sys/time.h>
  70 #include <sys/types.h>
  71 #include <sys/param.h>
  72 #include <sys/ioctl.h>
  73 #include <sys/sysctl.h>
  74 #include <sys/socket.h>
  75 #include "radix.h"
  76 #define UNUSED __attribute__((unused))
  77 #define PATTRIB(f,l) __attribute__((format (printf,f,l)))
  78 #include <net/if.h>
  79 #include <net/route.h>
  80 #include <net/if_dl.h>
  81 #include <netinet/in.h>
  82 #include <arpa/inet.h>
  83 #define RIPVERSION RIPv2
  84 #include <protocols/routed.h>
  85
  86
  87 /* Type of an IP address.
  88  *      Some systems do not like to pass structures, so do not use in_addr.
  89  *      Some systems think a long has 64 bits, which would be a gross waste.
  90  * So define it here so it can be changed for the target system.
  91  * It should be defined somewhere netinet/in.h, but it is not.
  92  */
  93 #if defined (__NetBSD__)
  94 #define naddr u_int32_t
  95 #define _HAVE_SA_LEN
  96 #define _HAVE_SIN_LEN
  97 #else
  98 #define naddr u_long
  99 #define _HAVE_SA_LEN
 100 #define _HAVE_SIN_LEN
 101 #endif
 102
 103 /* Turn on if IP_DROP_MEMBERSHIP and IP_ADD_MEMBERSHIP do not look at
 104  * the dstaddr of point-to-point interfaces.
 105  */
 106 #ifdef __NetBSD__
 107 #define MCAST_PPP_BUG
 108 #endif
 109
 110 #define DAY (24*60*60)
 111 #define NEVER DAY                       /* a long time */
 112 #define EPOCH NEVER                     /* bias time by this to avoid <0 */
 113
 114 /* Scan the kernel regularly to see if any interfaces have appeared or been
 115  * turned off.  These must be less than STALE_TIME.
 116  */
 117 #define CHECK_BAD_INTERVAL      5       /* when an interface is known bad */
 118 #define CHECK_ACT_INTERVAL      30      /* when advertising */
 119 #define CHECK_QUIET_INTERVAL    300     /* when not */
 120
 121 #define LIM_SEC(s,l) ((s).tv_sec = MIN((s).tv_sec, (l)))
 122
 123 /* Metric used for fake default routes.  It ought to be 15, but when
 124  * processing advertised routes, previous versions of `routed` added
 125  * to the received metric and discarded the route if the total was 16
 126  * or larger.
 127  */
 128 #define FAKE_METRIC (HOPCNT_INFINITY-2)
 129
 130
 131 /* Router Discovery parameters */
 132 #define INADDR_ALLROUTERS_GROUP         0xe0000002  /* 224.0.0.2 */
 133 #define MaxMaxAdvertiseInterval         1800
 134 #define MinMaxAdvertiseInterval         4
 135 #define DefMaxAdvertiseInterval         600
 136 #define DEF_PreferenceLevel             0
 137 #define MIN_PreferenceLevel             0x80000000
 138
 139 #define MAX_INITIAL_ADVERT_INTERVAL     16
 140 #define MAX_INITIAL_ADVERTS             3
 141 #define MAX_RESPONSE_DELAY              2
 142
 143 #define MAX_SOLICITATION_DELAY          1
 144 #define SOLICITATION_INTERVAL           3
 145 #define MAX_SOLICITATIONS               3
 146
 147
 148 /* Bloated packet size for systems that simply add authentication to
 149  * full-sized packets
 150  */
 151 #define OVER_MAXPACKETSIZE (MAXPACKETSIZE+sizeof(struct netinfo)*2)
 152 /* typical packet buffers */
 153 union pkt_buf {
 154         char    packet[OVER_MAXPACKETSIZE*2];
 155         struct  rip rip;
 156 };
 157
 158 #define GNAME_LEN   64                  /* assumed=64 in parms.c */
 159 /* bigger than IFNAMSIZ, with room for "external()" or "remote()" */
 160 #define IF_NAME_LEN (GNAME_LEN+15)
 161
 162 /* No more routes than this, to protect ourself in case something goes
 163  * whacko and starts broadcasting zillions of bogus routes.
 164  */
 165 #define MAX_ROUTES  (128*1024)
 166 extern int total_routes;
 167
 168 /* Main, daemon routing table structure
 169  */
 170 struct rt_entry {
 171         struct  radix_node rt_nodes[2]; /* radix tree glue */
 172         u_int   rt_state;
 173 #           define RS_IF        0x001   /* for network interface */
 174 #           define RS_NET_INT   0x002   /* authority route */
 175 #           define RS_NET_SYN   0x004   /* fake net route for subnet */
 176 #           define RS_NO_NET_SYN (RS_LOCAL | RS_LOCAL | RS_IF)
 177 #           define RS_SUBNET    0x008   /* subnet route from any source */
 178 #           define RS_LOCAL     0x010   /* loopback for pt-to-pt */
 179 #           define RS_MHOME     0x020   /* from -m */
 180 #           define RS_STATIC    0x040   /* from the kernel */
 181 #           define RS_RDISC     0x080   /* from router discovery */
 182         struct sockaddr_in rt_dst_sock;
 183         naddr   rt_mask;
 184         struct rt_spare {
 185             struct interface *rts_ifp;
 186             naddr   rts_gate;           /* forward packets here */
 187             naddr   rts_router;         /* on the authority of this router */
 188             char    rts_metric;
 189             u_short rts_tag;
 190             time_t  rts_time;           /* timer to junk stale routes */
 191             u_int   rts_de_ag;          /* de-aggregation level */
 192 #define NUM_SPARES 4
 193         } rt_spares[NUM_SPARES];
 194         u_int   rt_seqno;               /* when last changed */
 195         char    rt_poison_metric;       /* to notice maximum recently */
 196         time_t  rt_poison_time;         /*      advertised metric */
 197 };
 198 #define rt_dst      rt_dst_sock.sin_addr.s_addr
 199 #define rt_ifp      rt_spares[0].rts_ifp
 200 #define rt_gate     rt_spares[0].rts_gate
 201 #define rt_router   rt_spares[0].rts_router
 202 #define rt_metric   rt_spares[0].rts_metric
 203 #define rt_tag      rt_spares[0].rts_tag
 204 #define rt_time     rt_spares[0].rts_time
 205 #define rt_de_ag    rt_spares[0].rts_de_ag
 206
 207 #define HOST_MASK       0xffffffff
 208 #define RT_ISHOST(rt)   ((rt)->rt_mask == HOST_MASK)
 209
 210 /* age all routes that
 211  *      are not from -g, -m, or static routes from the kernel
 212  *      not unbroken interface routes
 213  *              but not broken interfaces
 214  *      nor non-passive, remote interfaces that are not aliases
 215  *              (i.e. remote & metric=0)
 216  */
 217 #define AGE_RT(rt_state,ifp) (0 == ((rt_state) & (RS_MHOME | RS_STATIC      \
 218                                                   | RS_NET_SYN | RS_RDISC)) \
 219                               && (!((rt_state) & RS_IF)                     \
 220                                   || (ifp) == 0                             \
 221                                   || (((ifp)->int_state & IS_REMOTE)        \
 222                                       && !((ifp)->int_state & IS_PASSIVE))))
 223
 224 /* true if A is better than B
 225  * Better if
 226  *      - A is not a poisoned route
 227  *      - and A is not stale
 228  *      - and A has a shorter path
 229  *              - or is the router speaking for itself
 230  *              - or the current route is equal but stale
 231  *              - or it is a host route advertised by a system for itself
 232  */
 233 #define BETTER_LINK(rt,A,B) ((A)->rts_metric < HOPCNT_INFINITY          \
 234                              && now_stale <= (A)->rts_time              \
 235                              && ((A)->rts_metric < (B)->rts_metric      \
 236                                  || ((A)->rts_gate == (A)->rts_router   \
 237                                      && (B)->rts_gate != (B)->rts_router) \
 238                                  || ((A)->rts_metric == (B)->rts_metric \
 239                                      && now_stale > (B)->rts_time)      \
 240                                  || (RT_ISHOST(rt)                      \
 241                                      && (rt)->rt_dst == (A)->rts_router \
 242                                      && (A)->rts_metric == (B)->rts_metric)))
 243
 244
 245 /* An "interface" is similar to a kernel ifnet structure, except it also
 246  * handles "logical" or "IS_REMOTE" interfaces (remote gateways).
 247  */
 248 struct interface {
 249         struct interface *int_next, **int_prev;
 250         struct interface *int_ahash, **int_ahash_prev;
 251         struct interface *int_bhash, **int_bhash_prev;
 252         struct interface *int_rlink, **int_rlink_prev;
 253         struct interface *int_nhash, **int_nhash_prev;
 254         char    int_name[IF_NAME_LEN+1];
 255         u_short int_index;
 256         naddr   int_addr;               /* address on this host (net order) */
 257         naddr   int_brdaddr;            /* broadcast address (n) */
 258         naddr   int_dstaddr;            /* other end of pt-to-pt link (n) */
 259         naddr   int_net;                /* working network # (host order)*/
 260         naddr   int_mask;               /* working net mask (host order) */
 261         naddr   int_ripv1_mask;         /* for inferring a mask (n) */
 262         naddr   int_std_addr;           /* class A/B/C address (n) */
 263         naddr   int_std_net;            /* class A/B/C network (h) */
 264         naddr   int_std_mask;           /* class A/B/C netmask (h) */
 265         int     int_rip_sock;           /* for queries */
 266         int     int_if_flags;           /* some bits copied from kernel */
 267         u_int   int_state;
 268         time_t  int_act_time;           /* last thought healthy */
 269         time_t  int_query_time;
 270         u_short int_transitions;        /* times gone up-down */
 271         char    int_metric;
 272         char    int_d_metric;           /* for faked default route */
 273         struct int_data {
 274                 u_int   ipackets;       /* previous network stats */
 275                 u_int   ierrors;
 276                 u_int   opackets;
 277                 u_int   oerrors;
 278                 time_t  ts;             /* timestamp on network stats */
 279         } int_data;
 280 #       define MAX_AUTH_KEYS 5
 281         struct auth {                   /* authentication info */
 282             u_int16_t type;
 283             u_char  key[RIP_AUTH_PW_LEN];
 284             u_char  keyid;
 285             time_t  start, end;
 286         } int_auth[MAX_AUTH_KEYS];
 287         /* router discovery parameters */
 288         int     int_rdisc_pref;         /* signed preference to advertise */
 289         int     int_rdisc_int;          /* MaxAdvertiseInterval */
 290         int     int_rdisc_cnt;
 291         struct timeval int_rdisc_timer;
 292 };
 293
 294 /* bits in int_state */
 295 #define IS_ALIAS            0x0000001   /* interface alias */
 296 #define IS_SUBNET           0x0000002   /* interface on subnetted network */
 297 #define IS_REMOTE           0x0000004   /* interface is not on this machine */
 298 #define IS_PASSIVE          0x0000008   /* remote and does not do RIP */
 299 #define IS_EXTERNAL         0x0000010   /* handled by EGP or something */
 300 #define IS_CHECKED          0x0000020   /* still exists */
 301 #define IS_ALL_HOSTS        0x0000040   /* in INADDR_ALLHOSTS_GROUP */
 302 #define IS_ALL_ROUTERS      0x0000080   /* in INADDR_ALLROUTERS_GROUP */
 303 #define IS_DISTRUST         0x0000100   /* ignore untrusted routers */
 304 #define IS_REDIRECT_OK      0x0000200   /* accept ICMP redirects */
 305 #define IS_BROKE            0x0000400   /* seems to be broken */
 306 #define IS_SICK             0x0000800   /* seems to be broken */
 307 #define IS_DUP              0x0001000   /* has a duplicate address */
 308 #define IS_NEED_NET_SYN     0x0002000   /* need RS_NET_SYN route */
 309 #define IS_NO_AG            0x0004000   /* do not aggregate subnets */
 310 #define IS_NO_SUPER_AG      0x0008000   /* do not aggregate networks */
 311 #define IS_NO_RIPV1_IN      0x0010000   /* no RIPv1 input at all */
 312 #define IS_NO_RIPV2_IN      0x0020000   /* no RIPv2 input at all */
 313 #define IS_NO_RIP_IN    (IS_NO_RIPV1_IN | IS_NO_RIPV2_IN)
 314 #define IS_RIP_IN_OFF(s) (((s) & IS_NO_RIP_IN) == IS_NO_RIP_IN)
 315 #define IS_NO_RIPV1_OUT     0x0040000   /* no RIPv1 output at all */
 316 #define IS_NO_RIPV2_OUT     0x0080000   /* no RIPv2 output at all */
 317 #define IS_NO_RIP_OUT   (IS_NO_RIPV1_OUT | IS_NO_RIPV2_OUT)
 318 #define IS_NO_RIP       (IS_NO_RIP_OUT | IS_NO_RIP_IN)
 319 #define IS_RIP_OUT_OFF(s) (((s) & IS_NO_RIP_OUT) == IS_NO_RIP_OUT)
 320 #define IS_RIP_OFF(s)   (((s) & IS_NO_RIP) == IS_NO_RIP)
 321 #define IS_NO_RIP_MCAST     0x0100000   /* broadcast RIPv2 */
 322 #define IS_NO_ADV_IN        0x0200000   /* do not listen to advertisements */
 323 #define IS_NO_SOL_OUT       0x0400000   /* send no solicitations */
 324 #define IS_SOL_OUT          0x0800000   /* send solicitations */
 325 #define GROUP_IS_SOL_OUT (IS_SOL_OUT | IS_NO_SOL_OUT)
 326 #define IS_NO_ADV_OUT       0x1000000   /* do not advertise rdisc */
 327 #define IS_ADV_OUT          0x2000000   /* advertise rdisc */
 328 #define GROUP_IS_ADV_OUT (IS_NO_ADV_OUT | IS_ADV_OUT)
 329 #define IS_BCAST_RDISC      0x4000000   /* broadcast instead of multicast */
 330 #define IS_NO_RDISC     (IS_NO_ADV_IN | IS_NO_SOL_OUT | IS_NO_ADV_OUT)
 331 #define IS_PM_RDISC         0x8000000   /* poor-man's router discovery */
 332
 333 #define iff_up(f) ((f) & IFF_UP)
 334
 335
 336 /* Information for aggregating routes */
 337 #define NUM_AG_SLOTS    32
 338 struct ag_info {
 339         struct ag_info *ag_fine;        /* slot with finer netmask */
 340         struct ag_info *ag_cors;        /* more coarse netmask */
 341         naddr   ag_dst_h;               /* destination in host byte order */
 342         naddr   ag_mask;
 343         naddr   ag_gate;
 344         naddr   ag_nhop;
 345         char    ag_metric;              /* metric to be advertised */
 346         char    ag_pref;                /* aggregate based on this */
 347         u_int   ag_seqno;
 348         u_short ag_tag;
 349         u_short ag_state;
 350 #define     AGS_SUPPRESS    0x001       /* combine with coarser mask */
 351 #define     AGS_AGGREGATE   0x002       /* synthesize combined routes */
 352 #define     AGS_REDUN0      0x004       /* redundant, finer routes output */
 353 #define     AGS_REDUN1      0x008
 354 #define     AG_IS_REDUN(state) (((state) & (AGS_REDUN0 | AGS_REDUN1)) \
 355                                 == (AGS_REDUN0 | AGS_REDUN1))
 356 #define     AGS_GATEWAY     0x010       /* tell kernel RTF_GATEWAY */
 357 #define     AGS_IF          0x020       /* for an interface */
 358 #define     AGS_RIPV2       0x040       /* send only as RIPv2 */
 359 #define     AGS_FINE_GATE   0x080       /* ignore differing ag_gate when this
 360                                          * has the finer netmask */
 361 #define     AGS_CORS_GATE   0x100       /* ignore differing gate when this
 362                                          * has the coarser netmasks */
 363 #define     AGS_SPLIT_HZ    0x200       /* suppress for split horizon */
 364
 365         /* some bits are set if they are set on either route */
 366 #define     AGS_AGGREGATE_EITHER (AGS_RIPV2 | AGS_GATEWAY |   \
 367                                   AGS_SUPPRESS | AGS_CORS_GATE)
 368 };
 369
 370
 371 /* parameters for interfaces */
 372 extern struct parm {
 373         struct parm *parm_next;
 374         char    parm_name[IF_NAME_LEN+1];
 375         naddr   parm_net;
 376         naddr   parm_mask;
 377
 378         char    parm_d_metric;
 379         u_int   parm_int_state;
 380         int     parm_rdisc_pref;        /* signed IRDP preference */
 381         int     parm_rdisc_int;         /* IRDP advertising interval */
 382         struct auth parm_auth[MAX_AUTH_KEYS];
 383 } *parms;
 384
 385 /* authority for internal networks */
 386 extern struct intnet {
 387         struct intnet *intnet_next;
 388         naddr   intnet_addr;            /* network byte order */
 389         naddr   intnet_mask;
 390         char    intnet_metric;
 391 } *intnets;
 392
 393 /* defined RIPv1 netmasks */
 394 extern struct r1net {
 395         struct r1net *r1net_next;
 396         naddr   r1net_net;              /* host order */
 397         naddr   r1net_match;
 398         naddr   r1net_mask;
 399 } *r1nets;
 400
 401 /* trusted routers */
 402 extern struct tgate {
 403         struct tgate *tgate_next;
 404         naddr   tgate_addr;
 405 #define     MAX_TGATE_NETS 32
 406         struct tgate_net {
 407             naddr   net;                /* host order */
 408             naddr   mask;
 409         } tgate_nets[MAX_TGATE_NETS];
 410 } *tgates;
 411
 412 enum output_type {OUT_QUERY, OUT_UNICAST, OUT_BROADCAST, OUT_MULTICAST,
 413         NO_OUT_MULTICAST, NO_OUT_RIPV2};
 414
 415 /* common output buffers */
 416 extern struct ws_buf {
 417         struct rip      *buf;
 418         struct netinfo  *n;
 419         struct netinfo  *base;
 420         struct netinfo  *lim;
 421         enum output_type type;
 422 } v12buf, v2buf;
 423
 424 extern pid_t    mypid;
 425 extern naddr    myaddr;                 /* main address of this system */
 426
 427 extern int      stopint;                /* !=0 to stop */
 428
 429 extern int      sock_max;
 430 extern int      rip_sock;               /* RIP socket */
 431 extern struct interface *rip_sock_mcast;    /* current multicast interface */
 432 extern int      rt_sock;                /* routing socket */
 433 extern int      rt_sock_seqno;
 434 extern int      rdisc_sock;             /* router-discovery raw socket */
 435
 436 extern int      seqno;                  /* sequence number for messages */
 437 extern int      supplier;               /* process should supply updates */
 438 extern int      supplier_set;           /* -s or -q requested */
 439 extern int      lookforinterfaces;      /* 1=probe for new up interfaces */
 440 extern int      ridhosts;               /* 1=reduce host routes */
 441 extern int      mhome;                  /* 1=want multi-homed host route */
 442 extern int      advertise_mhome;        /* 1=must continue advertising it */
 443 extern int      auth_ok;                /* 1=ignore auth if we do not care */
 444
 445 extern struct timeval clk;              /* system clock's idea of time */
 446 extern struct timeval epoch;            /* system clock when started */
 447 extern struct timeval now;              /* current idea of time */
 448 extern time_t   now_stale;
 449 extern time_t   now_expire;
 450 extern time_t   now_garbage;
 451
 452 extern struct timeval next_bcast;       /* next general broadcast */
 453 extern struct timeval age_timer;        /* next check of old routes */
 454 extern struct timeval no_flash;         /* inhibit flash update until then */
 455 extern struct timeval rdisc_timer;      /* next advert. or solicitation */
 456 extern int rdisc_ok;                    /* using solicited route */
 457
 458 extern struct timeval ifinit_timer;     /* time to check interfaces */
 459
 460 extern naddr    loopaddr;               /* our address on loopback */
 461 extern int      tot_interfaces;         /* # of remote and local interfaces */
 462 extern int      rip_interfaces;         /* # of interfaces doing RIP */
 463 extern struct interface *ifnet;         /* all interfaces */
 464 extern struct interface *remote_if;     /* remote interfaces */
 465 extern int      have_ripv1_out;         /* have a RIPv1 interface */
 466 extern int      have_ripv1_in;
 467 extern int      need_flash;             /* flash update needed */
 468 extern struct timeval need_kern;        /* need to update kernel table */
 469 extern u_int    update_seqno;           /* a route has changed */
 470
 471 extern int      tracelevel, new_tracelevel;
 472 #define MAX_TRACELEVEL 4
 473 #define TRACEKERNEL (tracelevel >= 4)   /* log kernel changes */
 474 #define TRACECONTENTS (tracelevel >= 3) /* display packet contents */
 475 #define TRACEPACKETS (tracelevel >= 2)  /* note packets */
 476 #define TRACEACTIONS (tracelevel != 0)
 477 extern FILE     *ftrace;                /* output trace file */
 478 extern char inittracename[MAXPATHLEN+1];
 479
 480 extern struct radix_node_head *rhead;
 481
 482
 483 extern void fix_sock(int, const char *);
 484 extern void fix_select(void);
 485 extern void rip_off(void);
 486 extern void rip_on(struct interface *);
 487
 488 extern void bufinit(void);
 489 extern int  output(enum output_type, struct sockaddr_in *,
 490                    struct interface *, struct rip *, int);
 491 extern void clr_ws_buf(struct ws_buf *, struct auth *);
 492 extern void rip_query(void);
 493 extern void rip_bcast(int);
 494 extern void supply(struct sockaddr_in *, struct interface *,
 495                    enum output_type, int, int, int);
 496
 497 extern void     msglog(const char *, ...) PATTRIB(1,2);
 498 struct msg_limit {
 499     time_t      reuse;
 500     struct msg_sub {
 501         naddr   addr;
 502         time_t  until;
 503 #   define MSG_SUBJECT_N 8
 504     } subs[MSG_SUBJECT_N];
 505 };
 506 extern void     msglim(struct msg_limit *, naddr,
 507                        const char *, ...) PATTRIB(3,4);
 508 #define LOGERR(msg) msglog(msg ": %s", strerror(errno))
 509 extern void     logbad(int, const char *, ...) PATTRIB(2,3);
 510 #define BADERR(dump,msg) logbad(dump,msg ": %s", strerror(errno))
 511 #ifdef DEBUG
 512 #define DBGERR(dump,msg) BADERR(dump,msg)
 513 #else
 514 #define DBGERR(dump,msg) LOGERR(msg)
 515 #endif
 516 extern  char    *naddr_ntoa(naddr);
 517 extern const char *saddr_ntoa(struct sockaddr *);
 518
 519 extern void     *rtmalloc(size_t, const char *);
 520 extern void     timevaladd(struct timeval *, struct timeval *);
 521 extern void     intvl_random(struct timeval *, u_long, u_long);
 522 extern int      getnet(char *, naddr *, naddr *);
 523 extern int      gethost(char *, naddr *);
 524 extern void     gwkludge(void);
 525 extern const char *parse_parms(char *, int);
 526 extern const char *check_parms(struct parm *);
 527 extern void     get_parms(struct interface *);
 528
 529 extern void     lastlog(void);
 530 extern void     trace_close(int);
 531 extern void     set_tracefile(const char *, const char *, int);
 532 extern void     tracelevel_msg(const char *, int);
 533 extern void     trace_off(const char*, ...) PATTRIB(1,2);
 534 extern void     set_tracelevel(void);
 535 extern void     trace_flush(void);
 536 extern void     trace_misc(const char *, ...) PATTRIB(1,2);
 537 extern void     trace_act(const char *, ...) PATTRIB(1,2);
 538 extern void     trace_pkt(const char *, ...) PATTRIB(1,2);
 539 extern void     trace_add_del(const char *, struct rt_entry *);
 540 extern void     trace_change(struct rt_entry *, u_int, struct rt_spare *,
 541                              const char *);
 542 extern void     trace_if(const char *, struct interface *);
 543 extern void     trace_upslot(struct rt_entry *, struct rt_spare *,
 544                              struct rt_spare *);
 545 extern void     trace_rip(const char*, const char*, struct sockaddr_in *,
 546                           struct interface *, struct rip *, int);
 547 extern char     *addrname(naddr, naddr, int);
 548 extern char     *rtname(naddr, naddr, naddr);
 549
 550 extern void     rdisc_age(naddr);
 551 extern void     set_rdisc_mg(struct interface *, int);
 552 extern void     set_supplier(void);
 553 extern void     if_bad_rdisc(struct interface *);
 554 extern void     if_ok_rdisc(struct interface *);
 555 extern void     read_rip(int, struct interface *);
 556 extern void     read_rt(void);
 557 extern void     read_d(void);
 558 extern void     rdisc_adv(void);
 559 extern void     rdisc_sol(void);
 560
 561 extern void     sigalrm(int);
 562 extern void     sigterm(int);
 563
 564 extern void     sigtrace_on(int);
 565 extern void     sigtrace_off(int);
 566
 567 extern void     flush_kern(void);
 568 extern void     age(naddr);
 569
 570 extern void     ag_flush(naddr, naddr, void (*)(struct ag_info *));
 571 extern void     ag_check(naddr, naddr, naddr, naddr, char, char, u_int,
 572                          u_short, u_short, void (*)(struct ag_info *));
 573 extern void     del_static(naddr, naddr, naddr, int);
 574 extern void     del_redirects(naddr, time_t);
 575 extern struct rt_entry *rtget(naddr, naddr);
 576 extern struct rt_entry *rtfind(naddr);
 577 extern void     rtinit(void);
 578 extern void     rtadd(naddr, naddr, u_int, struct rt_spare *);
 579 extern void     rtchange(struct rt_entry *, u_int, struct rt_spare *, char *);
 580 extern void     rtdelete(struct rt_entry *);
 581 extern void     rts_delete(struct rt_entry *, struct rt_spare *);
 582 extern void     rtbad_sub(struct rt_entry *);
 583 extern void     rtswitch(struct rt_entry *, struct rt_spare *);
 584 extern void     rtbad(struct rt_entry *);
 585
 586 #define S_ADDR(x)       (((struct sockaddr_in *)(x))->sin_addr.s_addr)
 587 #define INFO_DST(I)     ((I)->rti_info[RTAX_DST])
 588 #define INFO_GATE(I)    ((I)->rti_info[RTAX_GATEWAY])
 589 #define INFO_MASK(I)    ((I)->rti_info[RTAX_NETMASK])
 590 #define INFO_IFA(I)     ((I)->rti_info[RTAX_IFA])
 591 #define INFO_IFP(I)     ((I)->rti_info[RTAX_IFP])
 592 #define INFO_AUTHOR(I)  ((I)->rti_info[RTAX_AUTHOR])
 593 #define INFO_BRD(I)     ((I)->rti_info[RTAX_BRD])
 594 void rt_xaddrs(struct rt_addrinfo *, struct sockaddr *, struct sockaddr *,
 595                int);
 596
 597 extern naddr    std_mask(naddr);
 598 extern naddr    ripv1_mask_net(naddr, struct interface *);
 599 extern naddr    ripv1_mask_host(naddr,struct interface *);
 600 #define         on_net(a,net,mask) (((ntohl(a) ^ (net)) & (mask)) == 0)
 601 extern int      check_dst(naddr);
 602 extern struct interface *check_dup(naddr, naddr, naddr, int);
 603 extern int      check_remote(struct interface *);
 604 extern int      addrouteforif(struct interface *);
 605 extern void     ifinit(void);
 606 extern int      walk_bad(struct radix_node *, struct walkarg *);
 607 extern int      if_ok(struct interface *, const char *);
 608 extern void     if_sick(struct interface *);
 609 extern void     if_bad(struct interface *);
 610 extern void     if_link(struct interface *);
 611 extern struct interface *ifwithaddr(naddr, int, int);
 612 extern struct interface *ifwithname(char *, naddr);
 613 extern struct interface *ifwithindex(u_short, int);
 614 extern struct interface *iflookup(naddr);
 615
 616 extern struct auth *find_auth(struct interface *);
 617 extern void end_md5_auth(struct ws_buf *, struct auth *);
 618
 619 #define MD5_DIGEST_LEN 16
 620 typedef struct {
 621         u_int32_t state[4];             /* state (ABCD) */
 622         u_int32_t count[2];             /* # of bits, modulo 2^64 (LSB 1st) */
 623         unsigned char buffer[64];       /* input buffer */
 624 } MD5_CTX;
 625 extern void MD5Init(MD5_CTX*);
 626 extern void MD5Update(MD5_CTX*, u_char*, u_int);
 627 extern void MD5Final(u_char[MD5_DIGEST_LEN], MD5_CTX*);