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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgment:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)defs.h      8.1 (Berkeley) 6/5/93
  34  *
  35  * $FreeBSD: src/sbin/routed/defs.h,v 1.13 1999/09/05 17:49:11 peter Exp $
  36  * $DragonFly: src/sbin/routed/defs.h,v 1.2 2003/06/17 06:27:34 dillon Exp $
  37  */
  38
  39 #ifdef  sgi
  40 #ident "$FreeBSD: src/sbin/routed/defs.h,v 1.13 1999/09/05 17:49:11 peter Exp $"
  41 #endif
  42
  43 /* Definitions for RIPv2 routing process.
  44  *
  45  * This code is based on the 4.4BSD `routed` daemon, with extensions to
  46  * support:
  47  *      RIPv2, including variable length subnet masks.
  48  *      Router Discovery
  49  *      aggregate routes in the kernel tables.
  50  *      aggregate advertised routes.
  51  *      maintain spare routes for faster selection of another gateway
  52  *              when the current gateway dies.
  53  *      timers on routes with second granularity so that selection
  54  *              of a new route does not wait 30-60 seconds.
  55  *      tolerance of static routes.
  56  *      tell the kernel hop counts
  57  *      do not advertise if ipforwarding=0
  58  *
  59  * The vestigial support for other protocols has been removed.  There
  60  * is no likelihood that IETF RIPv1 or RIPv2 will ever be used with
  61  * other protocols.  The result is far smaller, faster, cleaner, and
  62  * perhaps understandable.
  63  *
  64  * The accumulation of special flags and kludges added over the many
  65  * years have been simplified and integrated.
  66  */
  67
  68 #include <stdio.h>
  69 #include <netdb.h>
  70 #include <stdlib.h>
  71 #include <unistd.h>
  72 #include <errno.h>
  73 #include <string.h>
  74 #ifdef sgi
  75 #include <strings.h>
  76 #include <bstring.h>
  77 #endif
  78 #include <stdarg.h>
  79 #include <syslog.h>
  80 #include <time.h>
  81 #include <sys/cdefs.h>
  82 #include <sys/time.h>
  83 #include <sys/types.h>
  84 #include <sys/param.h>
  85 #include <sys/ioctl.h>
  86 #include <sys/sysctl.h>
  87 #include <sys/socket.h>
  88 #ifdef sgi
  89 #define _USER_ROUTE_TREE
  90 #include <net/radix.h>
  91 #else
  92 #include "radix.h"
  93 #define UNUSED __attribute__((unused))
  94 #define PATTRIB(f,l) __attribute__((format (printf,f,l)))
  95 #endif
  96 #include <net/if.h>
  97 #include <net/route.h>
  98 #include <net/if_dl.h>
  99 #include <netinet/in.h>
 100 #include <arpa/inet.h>
 101 #define RIPVERSION RIPv2
 102 #include <protocols/routed.h>
 103
 104
 105 /* Type of an IP address.
 106  *      Some systems do not like to pass structures, so do not use in_addr.
 107  *      Some systems think a long has 64 bits, which would be a gross waste.
 108  * So define it here so it can be changed for the target system.
 109  * It should be defined somewhere netinet/in.h, but it is not.
 110  */
 111 #ifdef sgi
 112 #define naddr u_int32_t
 113 #elif defined (__NetBSD__)
 114 #define naddr u_int32_t
 115 #define _HAVE_SA_LEN
 116 #define _HAVE_SIN_LEN
 117 #else
 118 #define naddr u_long
 119 #define _HAVE_SA_LEN
 120 #define _HAVE_SIN_LEN
 121 #endif
 122
 123 /* Turn on if IP_DROP_MEMBERSHIP and IP_ADD_MEMBERSHIP do not look at
 124  * the dstaddr of point-to-point interfaces.
 125  */
 126 #ifdef __NetBSD__
 127 #define MCAST_PPP_BUG
 128 #endif
 129
 130 #define DAY (24*60*60)
 131 #define NEVER DAY                       /* a long time */
 132 #define EPOCH NEVER                     /* bias time by this to avoid <0 */
 133
 134 /* Scan the kernel regularly to see if any interfaces have appeared or been
 135  * turned off.  These must be less than STALE_TIME.
 136  */
 137 #define CHECK_BAD_INTERVAL      5       /* when an interface is known bad */
 138 #define CHECK_ACT_INTERVAL      30      /* when advertising */
 139 #define CHECK_QUIET_INTERVAL    300     /* when not */
 140
 141 #define LIM_SEC(s,l) ((s).tv_sec = MIN((s).tv_sec, (l)))
 142
 143 /* Metric used for fake default routes.  It ought to be 15, but when
 144  * processing advertised routes, previous versions of `routed` added
 145  * to the received metric and discarded the route if the total was 16
 146  * or larger.
 147  */
 148 #define FAKE_METRIC (HOPCNT_INFINITY-2)
 149
 150
 151 /* Router Discovery parameters */
 152 #ifndef sgi
 153 #define INADDR_ALLROUTERS_GROUP         0xe0000002  /* 224.0.0.2 */
 154 #endif
 155 #define MaxMaxAdvertiseInterval         1800
 156 #define MinMaxAdvertiseInterval         4
 157 #define DefMaxAdvertiseInterval         600
 158 #define DEF_PreferenceLevel             0
 159 #define MIN_PreferenceLevel             0x80000000
 160
 161 #define MAX_INITIAL_ADVERT_INTERVAL     16
 162 #define MAX_INITIAL_ADVERTS             3
 163 #define MAX_RESPONSE_DELAY              2
 164
 165 #define MAX_SOLICITATION_DELAY          1
 166 #define SOLICITATION_INTERVAL           3
 167 #define MAX_SOLICITATIONS               3
 168
 169
 170 /* Bloated packet size for systems that simply add authentication to
 171  * full-sized packets
 172  */
 173 #define OVER_MAXPACKETSIZE (MAXPACKETSIZE+sizeof(struct netinfo)*2)
 174 /* typical packet buffers */
 175 union pkt_buf {
 176         char    packet[OVER_MAXPACKETSIZE*2];
 177         struct  rip rip;
 178 };
 179
 180 #define GNAME_LEN   64                  /* assumed=64 in parms.c */
 181 /* bigger than IFNAMSIZ, with room for "external()" or "remote()" */
 182 #define IF_NAME_LEN (GNAME_LEN+15)
 183
 184 /* No more routes than this, to protect ourself in case something goes
 185  * whacko and starts broadcasting zillions of bogus routes.
 186  */
 187 #define MAX_ROUTES  (128*1024)
 188 extern int total_routes;
 189
 190 /* Main, daemon routing table structure
 191  */
 192 struct rt_entry {
 193         struct  radix_node rt_nodes[2]; /* radix tree glue */
 194         u_int   rt_state;
 195 #           define RS_IF        0x001   /* for network interface */
 196 #           define RS_NET_INT   0x002   /* authority route */
 197 #           define RS_NET_SYN   0x004   /* fake net route for subnet */
 198 #           define RS_NO_NET_SYN (RS_LOCAL | RS_LOCAL | RS_IF)
 199 #           define RS_SUBNET    0x008   /* subnet route from any source */
 200 #           define RS_LOCAL     0x010   /* loopback for pt-to-pt */
 201 #           define RS_MHOME     0x020   /* from -m */
 202 #           define RS_STATIC    0x040   /* from the kernel */
 203 #           define RS_RDISC     0x080   /* from router discovery */
 204         struct sockaddr_in rt_dst_sock;
 205         naddr   rt_mask;
 206         struct rt_spare {
 207             struct interface *rts_ifp;
 208             naddr   rts_gate;           /* forward packets here */
 209             naddr   rts_router;         /* on the authority of this router */
 210             char    rts_metric;
 211             u_short rts_tag;
 212             time_t  rts_time;           /* timer to junk stale routes */
 213             u_int   rts_de_ag;          /* de-aggregation level */
 214 #define NUM_SPARES 4
 215         } rt_spares[NUM_SPARES];
 216         u_int   rt_seqno;               /* when last changed */
 217         char    rt_poison_metric;       /* to notice maximum recently */
 218         time_t  rt_poison_time;         /*      advertised metric */
 219 };
 220 #define rt_dst      rt_dst_sock.sin_addr.s_addr
 221 #define rt_ifp      rt_spares[0].rts_ifp
 222 #define rt_gate     rt_spares[0].rts_gate
 223 #define rt_router   rt_spares[0].rts_router
 224 #define rt_metric   rt_spares[0].rts_metric
 225 #define rt_tag      rt_spares[0].rts_tag
 226 #define rt_time     rt_spares[0].rts_time
 227 #define rt_de_ag    rt_spares[0].rts_de_ag
 228
 229 #define HOST_MASK       0xffffffff
 230 #define RT_ISHOST(rt)   ((rt)->rt_mask == HOST_MASK)
 231
 232 /* age all routes that
 233  *      are not from -g, -m, or static routes from the kernel
 234  *      not unbroken interface routes
 235  *              but not broken interfaces
 236  *      nor non-passive, remote interfaces that are not aliases
 237  *              (i.e. remote & metric=0)
 238  */
 239 #define AGE_RT(rt_state,ifp) (0 == ((rt_state) & (RS_MHOME | RS_STATIC      \
 240                                                   | RS_NET_SYN | RS_RDISC)) \
 241                               && (!((rt_state) & RS_IF)                     \
 242                                   || (ifp) == 0                             \
 243                                   || (((ifp)->int_state & IS_REMOTE)        \
 244                                       && !((ifp)->int_state & IS_PASSIVE))))
 245
 246 /* true if A is better than B
 247  * Better if
 248  *      - A is not a poisoned route
 249  *      - and A is not stale
 250  *      - and A has a shorter path
 251  *              - or is the router speaking for itself
 252  *              - or the current route is equal but stale
 253  *              - or it is a host route advertised by a system for itself
 254  */
 255 #define BETTER_LINK(rt,A,B) ((A)->rts_metric < HOPCNT_INFINITY          \
 256                              && now_stale <= (A)->rts_time              \
 257                              && ((A)->rts_metric < (B)->rts_metric      \
 258                                  || ((A)->rts_gate == (A)->rts_router   \
 259                                      && (B)->rts_gate != (B)->rts_router) \
 260                                  || ((A)->rts_metric == (B)->rts_metric \
 261                                      && now_stale > (B)->rts_time)      \
 262                                  || (RT_ISHOST(rt)                      \
 263                                      && (rt)->rt_dst == (A)->rts_router \
 264                                      && (A)->rts_metric == (B)->rts_metric)))
 265
 266
 267 /* An "interface" is similar to a kernel ifnet structure, except it also
 268  * handles "logical" or "IS_REMOTE" interfaces (remote gateways).
 269  */
 270 struct interface {
 271         struct interface *int_next, **int_prev;
 272         struct interface *int_ahash, **int_ahash_prev;
 273         struct interface *int_bhash, **int_bhash_prev;
 274         struct interface *int_rlink, **int_rlink_prev;
 275         struct interface *int_nhash, **int_nhash_prev;
 276         char    int_name[IF_NAME_LEN+1];
 277         u_short int_index;
 278         naddr   int_addr;               /* address on this host (net order) */
 279         naddr   int_brdaddr;            /* broadcast address (n) */
 280         naddr   int_dstaddr;            /* other end of pt-to-pt link (n) */
 281         naddr   int_net;                /* working network # (host order)*/
 282         naddr   int_mask;               /* working net mask (host order) */
 283         naddr   int_ripv1_mask;         /* for inferring a mask (n) */
 284         naddr   int_std_addr;           /* class A/B/C address (n) */
 285         naddr   int_std_net;            /* class A/B/C network (h) */
 286         naddr   int_std_mask;           /* class A/B/C netmask (h) */
 287         int     int_rip_sock;           /* for queries */
 288         int     int_if_flags;           /* some bits copied from kernel */
 289         u_int   int_state;
 290         time_t  int_act_time;           /* last thought healthy */
 291         time_t  int_query_time;
 292         u_short int_transitions;        /* times gone up-down */
 293         char    int_metric;
 294         char    int_d_metric;           /* for faked default route */
 295         struct int_data {
 296                 u_int   ipackets;       /* previous network stats */
 297                 u_int   ierrors;
 298                 u_int   opackets;
 299                 u_int   oerrors;
 300 #ifdef sgi
 301                 u_int   odrops;
 302 #endif
 303                 time_t  ts;             /* timestamp on network stats */
 304         } int_data;
 305 #       define MAX_AUTH_KEYS 5
 306         struct auth {                   /* authentication info */
 307             u_int16_t type;
 308             u_char  key[RIP_AUTH_PW_LEN];
 309             u_char  keyid;
 310             time_t  start, end;
 311         } int_auth[MAX_AUTH_KEYS];
 312         /* router discovery parameters */
 313         int     int_rdisc_pref;         /* signed preference to advertise */
 314         int     int_rdisc_int;          /* MaxAdvertiseInterval */
 315         int     int_rdisc_cnt;
 316         struct timeval int_rdisc_timer;
 317 };
 318
 319 /* bits in int_state */
 320 #define IS_ALIAS            0x0000001   /* interface alias */
 321 #define IS_SUBNET           0x0000002   /* interface on subnetted network */
 322 #define IS_REMOTE           0x0000004   /* interface is not on this machine */
 323 #define IS_PASSIVE          0x0000008   /* remote and does not do RIP */
 324 #define IS_EXTERNAL         0x0000010   /* handled by EGP or something */
 325 #define IS_CHECKED          0x0000020   /* still exists */
 326 #define IS_ALL_HOSTS        0x0000040   /* in INADDR_ALLHOSTS_GROUP */
 327 #define IS_ALL_ROUTERS      0x0000080   /* in INADDR_ALLROUTERS_GROUP */
 328 #define IS_DISTRUST         0x0000100   /* ignore untrusted routers */
 329 #define IS_REDIRECT_OK      0x0000200   /* accept ICMP redirects */
 330 #define IS_BROKE            0x0000400   /* seems to be broken */
 331 #define IS_SICK             0x0000800   /* seems to be broken */
 332 #define IS_DUP              0x0001000   /* has a duplicate address */
 333 #define IS_NEED_NET_SYN     0x0002000   /* need RS_NET_SYN route */
 334 #define IS_NO_AG            0x0004000   /* do not aggregate subnets */
 335 #define IS_NO_SUPER_AG      0x0008000   /* do not aggregate networks */
 336 #define IS_NO_RIPV1_IN      0x0010000   /* no RIPv1 input at all */
 337 #define IS_NO_RIPV2_IN      0x0020000   /* no RIPv2 input at all */
 338 #define IS_NO_RIP_IN    (IS_NO_RIPV1_IN | IS_NO_RIPV2_IN)
 339 #define IS_RIP_IN_OFF(s) (((s) & IS_NO_RIP_IN) == IS_NO_RIP_IN)
 340 #define IS_NO_RIPV1_OUT     0x0040000   /* no RIPv1 output at all */
 341 #define IS_NO_RIPV2_OUT     0x0080000   /* no RIPv2 output at all */
 342 #define IS_NO_RIP_OUT   (IS_NO_RIPV1_OUT | IS_NO_RIPV2_OUT)
 343 #define IS_NO_RIP       (IS_NO_RIP_OUT | IS_NO_RIP_IN)
 344 #define IS_RIP_OUT_OFF(s) (((s) & IS_NO_RIP_OUT) == IS_NO_RIP_OUT)
 345 #define IS_RIP_OFF(s)   (((s) & IS_NO_RIP) == IS_NO_RIP)
 346 #define IS_NO_RIP_MCAST     0x0100000   /* broadcast RIPv2 */
 347 #define IS_NO_ADV_IN        0x0200000   /* do not listen to advertisements */
 348 #define IS_NO_SOL_OUT       0x0400000   /* send no solicitations */
 349 #define IS_SOL_OUT          0x0800000   /* send solicitations */
 350 #define GROUP_IS_SOL_OUT (IS_SOL_OUT | IS_NO_SOL_OUT)
 351 #define IS_NO_ADV_OUT       0x1000000   /* do not advertise rdisc */
 352 #define IS_ADV_OUT          0x2000000   /* advertise rdisc */
 353 #define GROUP_IS_ADV_OUT (IS_NO_ADV_OUT | IS_ADV_OUT)
 354 #define IS_BCAST_RDISC      0x4000000   /* broadcast instead of multicast */
 355 #define IS_NO_RDISC     (IS_NO_ADV_IN | IS_NO_SOL_OUT | IS_NO_ADV_OUT)
 356 #define IS_PM_RDISC         0x8000000   /* poor-man's router discovery */
 357
 358 #define iff_up(f) ((f) & IFF_UP)
 359
 360
 361 /* Information for aggregating routes */
 362 #define NUM_AG_SLOTS    32
 363 struct ag_info {
 364         struct ag_info *ag_fine;        /* slot with finer netmask */
 365         struct ag_info *ag_cors;        /* more coarse netmask */
 366         naddr   ag_dst_h;               /* destination in host byte order */
 367         naddr   ag_mask;
 368         naddr   ag_gate;
 369         naddr   ag_nhop;
 370         char    ag_metric;              /* metric to be advertised */
 371         char    ag_pref;                /* aggregate based on this */
 372         u_int   ag_seqno;
 373         u_short ag_tag;
 374         u_short ag_state;
 375 #define     AGS_SUPPRESS    0x001       /* combine with coarser mask */
 376 #define     AGS_AGGREGATE   0x002       /* synthesize combined routes */
 377 #define     AGS_REDUN0      0x004       /* redundant, finer routes output */
 378 #define     AGS_REDUN1      0x008
 379 #define     AG_IS_REDUN(state) (((state) & (AGS_REDUN0 | AGS_REDUN1)) \
 380                                 == (AGS_REDUN0 | AGS_REDUN1))
 381 #define     AGS_GATEWAY     0x010       /* tell kernel RTF_GATEWAY */
 382 #define     AGS_IF          0x020       /* for an interface */
 383 #define     AGS_RIPV2       0x040       /* send only as RIPv2 */
 384 #define     AGS_FINE_GATE   0x080       /* ignore differing ag_gate when this
 385                                          * has the finer netmask */
 386 #define     AGS_CORS_GATE   0x100       /* ignore differing gate when this
 387                                          * has the coarser netmasks */
 388 #define     AGS_SPLIT_HZ    0x200       /* suppress for split horizon */
 389
 390         /* some bits are set if they are set on either route */
 391 #define     AGS_AGGREGATE_EITHER (AGS_RIPV2 | AGS_GATEWAY |   \
 392                                   AGS_SUPPRESS | AGS_CORS_GATE)
 393 };
 394
 395
 396 /* parameters for interfaces */
 397 extern struct parm {
 398         struct parm *parm_next;
 399         char    parm_name[IF_NAME_LEN+1];
 400         naddr   parm_net;
 401         naddr   parm_mask;
 402
 403         char    parm_d_metric;
 404         u_int   parm_int_state;
 405         int     parm_rdisc_pref;        /* signed IRDP preference */
 406         int     parm_rdisc_int;         /* IRDP advertising interval */
 407         struct auth parm_auth[MAX_AUTH_KEYS];
 408 } *parms;
 409
 410 /* authority for internal networks */
 411 extern struct intnet {
 412         struct intnet *intnet_next;
 413         naddr   intnet_addr;            /* network byte order */
 414         naddr   intnet_mask;
 415         char    intnet_metric;
 416 } *intnets;
 417
 418 /* defined RIPv1 netmasks */
 419 extern struct r1net {
 420         struct r1net *r1net_next;
 421         naddr   r1net_net;              /* host order */
 422         naddr   r1net_match;
 423         naddr   r1net_mask;
 424 } *r1nets;
 425
 426 /* trusted routers */
 427 extern struct tgate {
 428         struct tgate *tgate_next;
 429         naddr   tgate_addr;
 430 #define     MAX_TGATE_NETS 32
 431         struct tgate_net {
 432             naddr   net;                /* host order */
 433             naddr   mask;
 434         } tgate_nets[MAX_TGATE_NETS];
 435 } *tgates;
 436
 437 enum output_type {OUT_QUERY, OUT_UNICAST, OUT_BROADCAST, OUT_MULTICAST,
 438         NO_OUT_MULTICAST, NO_OUT_RIPV2};
 439
 440 /* common output buffers */
 441 extern struct ws_buf {
 442         struct rip      *buf;
 443         struct netinfo  *n;
 444         struct netinfo  *base;
 445         struct netinfo  *lim;
 446         enum output_type type;
 447 } v12buf, v2buf;
 448
 449 extern pid_t    mypid;
 450 extern naddr    myaddr;                 /* main address of this system */
 451
 452 extern int      stopint;                /* !=0 to stop */
 453
 454 extern int      sock_max;
 455 extern int      rip_sock;               /* RIP socket */
 456 extern struct interface *rip_sock_mcast;    /* current multicast interface */
 457 extern int      rt_sock;                /* routing socket */
 458 extern int      rt_sock_seqno;
 459 extern int      rdisc_sock;             /* router-discovery raw socket */
 460
 461 extern int      seqno;                  /* sequence number for messages */
 462 extern int      supplier;               /* process should supply updates */
 463 extern int      supplier_set;           /* -s or -q requested */
 464 extern int      lookforinterfaces;      /* 1=probe for new up interfaces */
 465 extern int      ridhosts;               /* 1=reduce host routes */
 466 extern int      mhome;                  /* 1=want multi-homed host route */
 467 extern int      advertise_mhome;        /* 1=must continue advertising it */
 468 extern int      auth_ok;                /* 1=ignore auth if we do not care */
 469
 470 extern struct timeval clk;              /* system clock's idea of time */
 471 extern struct timeval epoch;            /* system clock when started */
 472 extern struct timeval now;              /* current idea of time */
 473 extern time_t   now_stale;
 474 extern time_t   now_expire;
 475 extern time_t   now_garbage;
 476
 477 extern struct timeval next_bcast;       /* next general broadcast */
 478 extern struct timeval age_timer;        /* next check of old routes */
 479 extern struct timeval no_flash;         /* inhibit flash update until then */
 480 extern struct timeval rdisc_timer;      /* next advert. or solicitation */
 481 extern int rdisc_ok;                    /* using solicited route */
 482
 483 extern struct timeval ifinit_timer;     /* time to check interfaces */
 484
 485 extern naddr    loopaddr;               /* our address on loopback */
 486 extern int      tot_interfaces;         /* # of remote and local interfaces */
 487 extern int      rip_interfaces;         /* # of interfaces doing RIP */
 488 extern struct interface *ifnet;         /* all interfaces */
 489 extern struct interface *remote_if;     /* remote interfaces */
 490 extern int      have_ripv1_out;         /* have a RIPv1 interface */
 491 extern int      have_ripv1_in;
 492 extern int      need_flash;             /* flash update needed */
 493 extern struct timeval need_kern;        /* need to update kernel table */
 494 extern u_int    update_seqno;           /* a route has changed */
 495
 496 extern int      tracelevel, new_tracelevel;
 497 #define MAX_TRACELEVEL 4
 498 #define TRACEKERNEL (tracelevel >= 4)   /* log kernel changes */
 499 #define TRACECONTENTS (tracelevel >= 3) /* display packet contents */
 500 #define TRACEPACKETS (tracelevel >= 2)  /* note packets */
 501 #define TRACEACTIONS (tracelevel != 0)
 502 extern FILE     *ftrace;                /* output trace file */
 503 extern char inittracename[MAXPATHLEN+1];
 504
 505 extern struct radix_node_head *rhead;
 506
 507
 508 #ifdef sgi
 509 /* Fix conflicts */
 510 #define dup2(x,y)               BSDdup2(x,y)
 511 #endif /* sgi */
 512
 513 extern void fix_sock(int, const char *);
 514 extern void fix_select(void);
 515 extern void rip_off(void);
 516 extern void rip_on(struct interface *);
 517
 518 extern void bufinit(void);
 519 extern int  output(enum output_type, struct sockaddr_in *,
 520                    struct interface *, struct rip *, int);
 521 extern void clr_ws_buf(struct ws_buf *, struct auth *);
 522 extern void rip_query(void);
 523 extern void rip_bcast(int);
 524 extern void supply(struct sockaddr_in *, struct interface *,
 525                    enum output_type, int, int, int);
 526
 527 extern void     msglog(const char *, ...) PATTRIB(1,2);
 528 struct msg_limit {
 529     time_t      reuse;
 530     struct msg_sub {
 531         naddr   addr;
 532         time_t  until;
 533 #   define MSG_SUBJECT_N 8
 534     } subs[MSG_SUBJECT_N];
 535 };
 536 extern void     msglim(struct msg_limit *, naddr,
 537                        const char *, ...) PATTRIB(3,4);
 538 #define LOGERR(msg) msglog(msg ": %s", strerror(errno))
 539 extern void     logbad(int, const char *, ...) PATTRIB(2,3);
 540 #define BADERR(dump,msg) logbad(dump,msg ": %s", strerror(errno))
 541 #ifdef DEBUG
 542 #define DBGERR(dump,msg) BADERR(dump,msg)
 543 #else
 544 #define DBGERR(dump,msg) LOGERR(msg)
 545 #endif
 546 extern  char    *naddr_ntoa(naddr);
 547 extern const char *saddr_ntoa(struct sockaddr *);
 548
 549 extern void     *rtmalloc(size_t, const char *);
 550 extern void     timevaladd(struct timeval *, struct timeval *);
 551 extern void     intvl_random(struct timeval *, u_long, u_long);
 552 extern int      getnet(char *, naddr *, naddr *);
 553 extern int      gethost(char *, naddr *);
 554 extern void     gwkludge(void);
 555 extern const char *parse_parms(char *, int);
 556 extern const char *check_parms(struct parm *);
 557 extern void     get_parms(struct interface *);
 558
 559 extern void     lastlog(void);
 560 extern void     trace_close(int);
 561 extern void     set_tracefile(const char *, const char *, int);
 562 extern void     tracelevel_msg(const char *, int);
 563 extern void     trace_off(const char*, ...) PATTRIB(1,2);
 564 extern void     set_tracelevel(void);
 565 extern void     trace_flush(void);
 566 extern void     trace_misc(const char *, ...) PATTRIB(1,2);
 567 extern void     trace_act(const char *, ...) PATTRIB(1,2);
 568 extern void     trace_pkt(const char *, ...) PATTRIB(1,2);
 569 extern void     trace_add_del(const char *, struct rt_entry *);
 570 extern void     trace_change(struct rt_entry *, u_int, struct rt_spare *,
 571                              const char *);
 572 extern void     trace_if(const char *, struct interface *);
 573 extern void     trace_upslot(struct rt_entry *, struct rt_spare *,
 574                              struct rt_spare *);
 575 extern void     trace_rip(const char*, const char*, struct sockaddr_in *,
 576                           struct interface *, struct rip *, int);
 577 extern char     *addrname(naddr, naddr, int);
 578 extern char     *rtname(naddr, naddr, naddr);
 579
 580 extern void     rdisc_age(naddr);
 581 extern void     set_rdisc_mg(struct interface *, int);
 582 extern void     set_supplier(void);
 583 extern void     if_bad_rdisc(struct interface *);
 584 extern void     if_ok_rdisc(struct interface *);
 585 extern void     read_rip(int, struct interface *);
 586 extern void     read_rt(void);
 587 extern void     read_d(void);
 588 extern void     rdisc_adv(void);
 589 extern void     rdisc_sol(void);
 590
 591 extern void     sigalrm(int);
 592 extern void     sigterm(int);
 593
 594 extern void     sigtrace_on(int);
 595 extern void     sigtrace_off(int);
 596
 597 extern void     flush_kern(void);
 598 extern void     age(naddr);
 599
 600 extern void     ag_flush(naddr, naddr, void (*)(struct ag_info *));
 601 extern void     ag_check(naddr, naddr, naddr, naddr, char, char, u_int,
 602                          u_short, u_short, void (*)(struct ag_info *));
 603 extern void     del_static(naddr, naddr, naddr, int);
 604 extern void     del_redirects(naddr, time_t);
 605 extern struct rt_entry *rtget(naddr, naddr);
 606 extern struct rt_entry *rtfind(naddr);
 607 extern void     rtinit(void);
 608 extern void     rtadd(naddr, naddr, u_int, struct rt_spare *);
 609 extern void     rtchange(struct rt_entry *, u_int, struct rt_spare *, char *);
 610 extern void     rtdelete(struct rt_entry *);
 611 extern void     rts_delete(struct rt_entry *, struct rt_spare *);
 612 extern void     rtbad_sub(struct rt_entry *);
 613 extern void     rtswitch(struct rt_entry *, struct rt_spare *);
 614 extern void     rtbad(struct rt_entry *);
 615
 616 #define S_ADDR(x)       (((struct sockaddr_in *)(x))->sin_addr.s_addr)
 617 #define INFO_DST(I)     ((I)->rti_info[RTAX_DST])
 618 #define INFO_GATE(I)    ((I)->rti_info[RTAX_GATEWAY])
 619 #define INFO_MASK(I)    ((I)->rti_info[RTAX_NETMASK])
 620 #define INFO_IFA(I)     ((I)->rti_info[RTAX_IFA])
 621 #define INFO_IFP(I)     ((I)->rti_info[RTAX_IFP])
 622 #define INFO_AUTHOR(I)  ((I)->rti_info[RTAX_AUTHOR])
 623 #define INFO_BRD(I)     ((I)->rti_info[RTAX_BRD])
 624 void rt_xaddrs(struct rt_addrinfo *, struct sockaddr *, struct sockaddr *,
 625                int);
 626
 627 extern naddr    std_mask(naddr);
 628 extern naddr    ripv1_mask_net(naddr, struct interface *);
 629 extern naddr    ripv1_mask_host(naddr,struct interface *);
 630 #define         on_net(a,net,mask) (((ntohl(a) ^ (net)) & (mask)) == 0)
 631 extern int      check_dst(naddr);
 632 extern struct interface *check_dup(naddr, naddr, naddr, int);
 633 extern int      check_remote(struct interface *);
 634 extern int      addrouteforif(struct interface *);
 635 extern void     ifinit(void);
 636 extern int      walk_bad(struct radix_node *, struct walkarg *);
 637 extern int      if_ok(struct interface *, const char *);
 638 extern void     if_sick(struct interface *);
 639 extern void     if_bad(struct interface *);
 640 extern void     if_link(struct interface *);
 641 extern struct interface *ifwithaddr(naddr, int, int);
 642 extern struct interface *ifwithname(char *, naddr);
 643 extern struct interface *ifwithindex(u_short, int);
 644 extern struct interface *iflookup(naddr);
 645
 646 extern struct auth *find_auth(struct interface *);
 647 extern void end_md5_auth(struct ws_buf *, struct auth *);
 648
 649 #define MD5_DIGEST_LEN 16
 650 typedef struct {
 651         u_int32_t state[4];             /* state (ABCD) */
 652         u_int32_t count[2];             /* # of bits, modulo 2^64 (LSB 1st) */
 653         unsigned char buffer[64];       /* input buffer */
 654 } MD5_CTX;
 655 extern void MD5Init(MD5_CTX*);
 656 extern void MD5Update(MD5_CTX*, u_char*, u_int);
 657 extern void MD5Final(u_char[MD5_DIGEST_LEN], MD5_CTX*);