lib/zebra.h

   1 /* Zebra common header.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Kunihiro Ishiguro
   3
   4 This file is part of GNU Zebra.
   5
   6 GNU Zebra is free software; you can redistribute it and/or modify it
   7 under the terms of the GNU General Public License as published by the
   8 Free Software Foundation; either version 2, or (at your option) any
   9 later version.
  10
  11 GNU Zebra is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Zebra; see the file COPYING.  If not, write to the Free
  18 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19 02111-1307, USA.  */
  20
  21 #ifndef _ZEBRA_H
  22 #define _ZEBRA_H
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif /* HAVE_CONFIG_H */
  27
  28 #ifdef SUNOS_5
  29 #define _XPG4_2
  30 typedef unsigned int    u_int32_t;
  31 typedef unsigned short  u_int16_t;
  32 typedef unsigned char   u_int8_t;
  33 #endif /* SUNOS_5 */
  34
  35 #ifndef HAVE_SOCKLEN_T
  36 typedef int socklen_t;
  37 #endif /* HAVE_SOCKLEN_T */
  38
  39 #include <unistd.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <stddef.h>
  43 #include <ctype.h>
  44 #include <errno.h>
  45 #include <fcntl.h>
  46 #include <signal.h>
  47 #include <string.h>
  48 #include <pwd.h>
  49 #include <grp.h>
  50 #ifdef HAVE_STROPTS_H
  51 #include <stropts.h>
  52 #endif /* HAVE_STROPTS_H */
  53 #ifdef HAVE_SYS_SELECT_H
  54 #include <sys/select.h>
  55 #endif /* HAVE_SYS_SELECT_H */
  56 #include <sys/stat.h>
  57 #include <sys/types.h>
  58 #include <sys/param.h>
  59 #ifdef HAVE_SYS_SYSCTL_H
  60 #ifdef GNU_LINUX
  61 #include <linux/types.h>
  62 #endif
  63 #include <sys/sysctl.h>
  64 #endif /* HAVE_SYS_SYSCTL_H */
  65 #include <sys/ioctl.h>
  66 #ifdef HAVE_SYS_CONF_H
  67 #include <sys/conf.h>
  68 #endif /* HAVE_SYS_CONF_H */
  69 #ifdef HAVE_SYS_KSYM_H
  70 #include <sys/ksym.h>
  71 #endif /* HAVE_SYS_KSYM_H */
  72 #include <syslog.h>
  73 #ifdef TIME_WITH_SYS_TIME
  74 # include <sys/time.h>
  75 # include <time.h>
  76 #else
  77 # ifdef HAVE_SYS_TIME_H
  78 #  include <sys/time.h>
  79 # else
  80 #  include <time.h>
  81 # endif
  82 #endif /* TIME_WITH_SYS_TIME */
  83 #include <sys/uio.h>
  84 #include <sys/utsname.h>
  85 #ifdef HAVE_RUSAGE
  86 #include <sys/resource.h>
  87 #endif /* HAVE_RUSAGE */
  88 #ifdef HAVE_LIMITS_H
  89 #include <limits.h>
  90 #endif /* HAVE_LIMITS_H */
  91 #ifdef HAVE_INTTYPES_H
  92 #include <inttypes.h>
  93 #endif /* HAVE_INTTYPES_H */
  94 #ifdef HAVE_STDBOOL_H
  95 #include <stdbool.h>
  96 #endif
  97
  98 /* machine dependent includes */
  99 #ifdef SUNOS_5
 100 #include <strings.h>
 101 #endif /* SUNOS_5 */
 102
 103 /* machine dependent includes */
 104 #ifdef HAVE_LINUX_VERSION_H
 105 #include <linux/version.h>
 106 #endif /* HAVE_LINUX_VERSION_H */
 107
 108 #ifdef HAVE_ASM_TYPES_H
 109 #include <asm/types.h>
 110 #endif /* HAVE_ASM_TYPES_H */
 111
 112 /* misc include group */
 113 #include <stdarg.h>
 114 #if !(defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L)
 115 /* Not C99; do we need to define va_copy? */
 116 #ifndef va_copy
 117 #ifdef __va_copy
 118 #define va_copy(DST,SRC) __va_copy(DST,SRC)
 119 #else
 120 /* Now we are desperate; this should work on many typical platforms.
 121    But this is slightly dangerous, because the standard does not require
 122    va_copy to be a macro. */
 123 #define va_copy(DST,SRC) memcpy(&(DST), &(SRC), sizeof(va_list))
 124 #warning "Not C99 and no va_copy macro available, falling back to memcpy"
 125 #endif /* __va_copy */
 126 #endif /* !va_copy */
 127 #endif /* !C99 */
 128
 129
 130 #ifdef HAVE_LCAPS
 131 #include <sys/capability.h>
 132 #include <sys/prctl.h>
 133 #endif /* HAVE_LCAPS */
 134
 135 #ifdef HAVE_SOLARIS_CAPABILITIES
 136 #include <priv.h>
 137 #endif /* HAVE_SOLARIS_CAPABILITIES */
 138
 139 /* network include group */
 140
 141 #include <sys/socket.h>
 142
 143 #ifdef HAVE_SYS_SOCKIO_H
 144 #include <sys/sockio.h>
 145 #endif /* HAVE_SYS_SOCKIO_H */
 146
 147 #ifdef __APPLE__
 148 #define __APPLE_USE_RFC_3542
 149 #endif
 150
 151 #ifdef HAVE_NETINET_IN_H
 152 #include <netinet/in.h>
 153 #endif /* HAVE_NETINET_IN_H */
 154 #include <netinet/in_systm.h>
 155 #include <netinet/ip.h>
 156 #include <netinet/tcp.h>
 157
 158 #ifdef HAVE_NET_NETOPT_H
 159 #include <net/netopt.h>
 160 #endif /* HAVE_NET_NETOPT_H */
 161
 162 #include <net/if.h>
 163
 164 #ifdef HAVE_NET_IF_DL_H
 165 #include <net/if_dl.h>
 166 #endif /* HAVE_NET_IF_DL_H */
 167
 168 #ifdef HAVE_NET_IF_VAR_H
 169 #include <net/if_var.h>
 170 #endif /* HAVE_NET_IF_VAR_H */
 171
 172 #ifdef HAVE_NET_ROUTE_H
 173 #include <net/route.h>
 174 #endif /* HAVE_NET_ROUTE_H */
 175
 176 #ifdef HAVE_NETLINK
 177 #include <linux/netlink.h>
 178 #include <linux/rtnetlink.h>
 179 #include <linux/filter.h>
 180 #else
 181 #define RT_TABLE_MAIN           0
 182 #endif /* HAVE_NETLINK */
 183
 184 #ifdef HAVE_NETDB_H
 185 #include <netdb.h>
 186 #endif /* HAVE_NETDB_H */
 187
 188 #include <arpa/inet.h>
 189
 190 #ifdef HAVE_INET_ND_H
 191 #include <inet/nd.h>
 192 #endif /* HAVE_INET_ND_H */
 193
 194 #ifdef HAVE_NETINET_IN_VAR_H
 195 #include <netinet/in_var.h>
 196 #endif /* HAVE_NETINET_IN_VAR_H */
 197
 198 #ifdef HAVE_NETINET6_IN6_VAR_H
 199 #include <netinet6/in6_var.h>
 200 #endif /* HAVE_NETINET6_IN6_VAR_H */
 201
 202 #ifdef HAVE_NETINET_IN6_VAR_H
 203 #include <netinet/in6_var.h>
 204 #endif /* HAVE_NETINET_IN6_VAR_H */
 205
 206 #ifdef HAVE_NETINET6_IN_H
 207 #include <netinet6/in.h>
 208 #endif /* HAVE_NETINET6_IN_H */
 209
 210
 211 #ifdef HAVE_NETINET6_IP6_H
 212 #include <netinet6/ip6.h>
 213 #endif /* HAVE_NETINET6_IP6_H */
 214
 215 #ifdef HAVE_NETINET_ICMP6_H
 216 #include <netinet/icmp6.h>
 217 #endif /* HAVE_NETINET_ICMP6_H */
 218
 219 #ifdef HAVE_NETINET6_ND6_H
 220 #include <netinet6/nd6.h>
 221 #endif /* HAVE_NETINET6_ND6_H */
 222
 223 /* Some systems do not define UINT32_MAX, etc.. from inttypes.h
 224  * e.g. this makes life easier for FBSD 4.11 users.
 225  */
 226 #ifndef INT8_MAX
 227 #define INT8_MAX        (127)
 228 #endif
 229 #ifndef INT16_MAX
 230 #define INT16_MAX       (32767)
 231 #endif
 232 #ifndef INT32_MAX
 233 #define INT32_MAX       (2147483647)
 234 #endif
 235 #ifndef UINT8_MAX
 236 #define UINT8_MAX       (255U)
 237 #endif
 238 #ifndef UINT16_MAX
 239 #define UINT16_MAX      (65535U)
 240 #endif
 241 #ifndef UINT32_MAX
 242 #define UINT32_MAX      (4294967295U)
 243 #endif
 244
 245 #ifdef HAVE_GLIBC_BACKTRACE
 246 #include <execinfo.h>
 247 #endif /* HAVE_GLIBC_BACKTRACE */
 248
 249 /* Local includes: */
 250 #if !(defined(__GNUC__) || defined(VTYSH_EXTRACT_PL))
 251 #define __attribute__(x)
 252 #endif  /* !__GNUC__ || VTYSH_EXTRACT_PL */
 253
 254 #include "zassert.h"
 255 #include "str.h"
 256
 257
 258 #ifdef HAVE_BROKEN_CMSG_FIRSTHDR
 259 /* This bug is present in Solaris 8 and pre-patch Solaris 9 <sys/socket.h>;
 260    please refer to http://bugzilla.quagga.net/show_bug.cgi?id=142 */
 261
 262 /* Check that msg_controllen is large enough. */
 263 #define ZCMSG_FIRSTHDR(mhdr) \
 264   (((size_t)((mhdr)->msg_controllen) >= sizeof(struct cmsghdr)) ? \
 265    CMSG_FIRSTHDR(mhdr) : (struct cmsghdr *)NULL)
 266
 267 #warning "CMSG_FIRSTHDR is broken on this platform, using a workaround"
 268
 269 #else /* HAVE_BROKEN_CMSG_FIRSTHDR */
 270 #define ZCMSG_FIRSTHDR(M) CMSG_FIRSTHDR(M)
 271 #endif /* HAVE_BROKEN_CMSG_FIRSTHDR */
 272
 273
 274
 275 /*
 276  * RFC 3542 defines several macros for using struct cmsghdr.
 277  * Here, we define those that are not present
 278  */
 279
 280 /*
 281  * Internal defines, for use only in this file.
 282  * These are likely wrong on other than ILP32 machines, so warn.
 283  */
 284 #ifndef _CMSG_DATA_ALIGN
 285 #define _CMSG_DATA_ALIGN(n)           (((n) + 3) & ~3)
 286 #endif /* _CMSG_DATA_ALIGN */
 287
 288 #ifndef _CMSG_HDR_ALIGN
 289 #define _CMSG_HDR_ALIGN(n)            (((n) + 3) & ~3)
 290 #endif /* _CMSG_HDR_ALIGN */
 291
 292 /*
 293  * CMSG_SPACE and CMSG_LEN are required in RFC3542, but were new in that
 294  * version.
 295  */
 296 #ifndef CMSG_SPACE
 297 #define CMSG_SPACE(l)       (_CMSG_DATA_ALIGN(sizeof(struct cmsghdr)) + \
 298                               _CMSG_HDR_ALIGN(l))
 299 #warning "assuming 4-byte alignment for CMSG_SPACE"
 300 #endif  /* CMSG_SPACE */
 301
 302
 303 #ifndef CMSG_LEN
 304 #define CMSG_LEN(l)         (_CMSG_DATA_ALIGN(sizeof(struct cmsghdr)) + (l))
 305 #warning "assuming 4-byte alignment for CMSG_LEN"
 306 #endif /* CMSG_LEN */
 307
 308
 309 /*  The definition of struct in_pktinfo is missing in old version of
 310     GLIBC 2.1 (Redhat 6.1).  */
 311 #if defined (GNU_LINUX) && ! defined (HAVE_STRUCT_IN_PKTINFO)
 312 struct in_pktinfo
 313 {
 314   int ipi_ifindex;
 315   struct in_addr ipi_spec_dst;
 316   struct in_addr ipi_addr;
 317 };
 318 #endif
 319
 320 /*
 321  * OSPF Fragmentation / fragmented writes
 322  *
 323  * ospfd can support writing fragmented packets, for cases where
 324  * kernel will not fragment IP_HDRINCL and/or multicast destined
 325  * packets (ie TTBOMK all kernels, BSD, SunOS, Linux). However,
 326  * SunOS, probably BSD too, clobber the user supplied IP ID and IP
 327  * flags fields, hence user-space fragmentation will not work.
 328  * Only Linux is known to leave IP header unmolested.
 329  * Further, fragmentation really should be done the kernel, which already
 330  * supports it, and which avoids nasty IP ID state problems.
 331  *
 332  * Fragmentation of OSPF packets can be required on networks with router
 333  * with many many interfaces active in one area, or on networks with links
 334  * with low MTUs.
 335  */
 336 #ifdef GNU_LINUX
 337 #define WANT_OSPF_WRITE_FRAGMENT
 338 #endif
 339
 340 /*
 341  * IP_HDRINCL / struct ip byte order
 342  *
 343  * Linux: network byte order
 344  * *BSD: network, except for length and offset. (cf Stevens)
 345  * SunOS: nominally as per BSD. but bug: network order on LE.
 346  * OpenBSD: network byte order, apart from older versions which are as per
 347  *          *BSD
 348  */
 349 #if defined(__NetBSD__) \
 350    || (defined(__FreeBSD__) && (__FreeBSD_version < 1100030)) \
 351    || (defined(__OpenBSD__) && (OpenBSD < 200311)) \
 352    || (defined(__APPLE__)) \
 353    || (defined(SUNOS_5) && defined(WORDS_BIGENDIAN))
 354 #define HAVE_IP_HDRINCL_BSD_ORDER
 355 #endif
 356
 357 /* Define BYTE_ORDER, if not defined. Useful for compiler conditional
 358  * code, rather than preprocessor conditional.
 359  * Not all the world has this BSD define.
 360  */
 361 #ifndef BYTE_ORDER
 362 #define BIG_ENDIAN      4321    /* least-significant byte first (vax, pc) */
 363 #define LITTLE_ENDIAN   1234    /* most-significant byte first (IBM, net) */
 364 #define PDP_ENDIAN      3412    /* LSB first in word, MSW first in long (pdp) */
 365
 366 #if defined(WORDS_BIGENDIAN)
 367 #define BYTE_ORDER      BIG_ENDIAN
 368 #else /* !WORDS_BIGENDIAN */
 369 #define BYTE_ORDER      LITTLE_ENDIAN
 370 #endif /* WORDS_BIGENDIAN */
 371
 372 #endif /* ndef BYTE_ORDER */
 373
 374 /* MAX / MIN are not commonly defined, but useful */
 375 #ifndef MAX
 376 #define MAX(a, b) \
 377         ({ typeof (a) _a = (a); \
 378            typeof (b) _b = (b); \
 379            _a > _b ? _a : _b; })
 380 #endif
 381 #ifndef MIN
 382 #define MIN(a, b) \
 383         ({ typeof (a) _a = (a); \
 384            typeof (b) _b = (b); \
 385            _a < _b ? _a : _b; })
 386 #endif
 387
 388 #define ZEBRA_NUM_OF(x) (sizeof (x) / sizeof (x[0]))
 389
 390 /* For old definition. */
 391 #ifndef IN6_ARE_ADDR_EQUAL
 392 #define IN6_ARE_ADDR_EQUAL IN6_IS_ADDR_EQUAL
 393 #endif /* IN6_ARE_ADDR_EQUAL */
 394
 395 /* default zebra TCP port for zclient */
 396 #define ZEBRA_PORT                      2600
 397
 398 /* Zebra message types. */
 399 #define ZEBRA_INTERFACE_ADD                1
 400 #define ZEBRA_INTERFACE_DELETE             2
 401 #define ZEBRA_INTERFACE_ADDRESS_ADD        3
 402 #define ZEBRA_INTERFACE_ADDRESS_DELETE     4
 403 #define ZEBRA_INTERFACE_UP                 5
 404 #define ZEBRA_INTERFACE_DOWN               6
 405 #define ZEBRA_IPV4_ROUTE_ADD               7
 406 #define ZEBRA_IPV4_ROUTE_DELETE            8
 407 #define ZEBRA_IPV6_ROUTE_ADD               9
 408 #define ZEBRA_IPV6_ROUTE_DELETE           10
 409 #define ZEBRA_REDISTRIBUTE_ADD            11
 410 #define ZEBRA_REDISTRIBUTE_DELETE         12
 411 #define ZEBRA_REDISTRIBUTE_DEFAULT_ADD    13
 412 #define ZEBRA_REDISTRIBUTE_DEFAULT_DELETE 14
 413 #define ZEBRA_IPV4_NEXTHOP_LOOKUP         15
 414 #define ZEBRA_IPV6_NEXTHOP_LOOKUP         16
 415 #define ZEBRA_IPV4_IMPORT_LOOKUP          17
 416 #define ZEBRA_IPV6_IMPORT_LOOKUP          18
 417 #define ZEBRA_INTERFACE_RENAME            19
 418 #define ZEBRA_ROUTER_ID_ADD               20
 419 #define ZEBRA_ROUTER_ID_DELETE            21
 420 #define ZEBRA_ROUTER_ID_UPDATE            22
 421 #define ZEBRA_HELLO                       23
 422 #define ZEBRA_NEXTHOP_REGISTER            24
 423 #define ZEBRA_NEXTHOP_UNREGISTER          25
 424 #define ZEBRA_NEXTHOP_UPDATE              26
 425 #define ZEBRA_INTERFACE_NBR_ADDRESS_ADD   27
 426 #define ZEBRA_INTERFACE_NBR_ADDRESS_DELETE 28
 427 #define ZEBRA_INTERFACE_BFD_DEST_UPDATE   29
 428 #define ZEBRA_IMPORT_ROUTE_REGISTER       30
 429 #define ZEBRA_IMPORT_ROUTE_UNREGISTER     31
 430 #define ZEBRA_IMPORT_CHECK_UPDATE         32
 431 #define ZEBRA_IPV4_ROUTE_IPV6_NEXTHOP_ADD 33
 432 #define ZEBRA_BFD_DEST_REGISTER           34
 433 #define ZEBRA_BFD_DEST_DEREGISTER         35
 434 #define ZEBRA_BFD_DEST_UPDATE             36
 435 #define ZEBRA_BFD_DEST_REPLAY             37
 436 #define ZEBRA_REDISTRIBUTE_IPV4_ADD       38
 437 #define ZEBRA_REDISTRIBUTE_IPV4_DEL       39
 438 #define ZEBRA_REDISTRIBUTE_IPV6_ADD       40
 439 #define ZEBRA_REDISTRIBUTE_IPV6_DEL       41
 440 #define ZEBRA_VRF_UNREGISTER              42
 441 #define ZEBRA_VRF_ADD                     43
 442 #define ZEBRA_VRF_DELETE                  44
 443 #define ZEBRA_INTERFACE_VRF_UPDATE        45
 444 #define ZEBRA_BFD_CLIENT_REGISTER         46
 445 #define ZEBRA_INTERFACE_ENABLE_RADV       47
 446 #define ZEBRA_INTERFACE_DISABLE_RADV      48
 447 #define ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB    49
 448 #define ZEBRA_MESSAGE_MAX                 50
 449
 450 /* Marker value used in new Zserv, in the byte location corresponding
 451  * the command value in the old zserv header. To allow old and new
 452  * Zserv headers to be distinguished from each other.
 453  */
 454 #define ZEBRA_HEADER_MARKER              255
 455
 456 /* Zebra route's types are defined in route_types.h */
 457 #include "route_types.h"
 458
 459 /* Note: whenever a new route-type or zserv-command is added the
 460  * corresponding {command,route}_types[] table in lib/log.c MUST be
 461  * updated! */
 462
 463 /* Map a route type to a string.  For example, ZEBRA_ROUTE_RIPNG -> "ripng". */
 464 extern const char *zebra_route_string(unsigned int route_type);
 465 /* Map a route type to a char.  For example, ZEBRA_ROUTE_RIPNG -> 'R'. */
 466 extern char zebra_route_char(unsigned int route_type);
 467 /* Map a zserv command type to the same string,
 468  * e.g. ZEBRA_INTERFACE_ADD -> "ZEBRA_INTERFACE_ADD" */
 469 /* Map a protocol name to its number. e.g. ZEBRA_ROUTE_BGP->9*/
 470 extern int proto_name2num(const char *s);
 471 /* Map redistribute X argument to protocol number.
 472  * unlike proto_name2num, this accepts shorthands and takes
 473  * an AFI value to restrict input */
 474 extern int proto_redistnum(int afi, const char *s);
 475
 476 extern const char *zserv_command_string (unsigned int command);
 477
 478 /* Error codes of zebra. */
 479 #define ZEBRA_ERR_NOERROR                0
 480 #define ZEBRA_ERR_RTEXIST               -1
 481 #define ZEBRA_ERR_RTUNREACH             -2
 482 #define ZEBRA_ERR_EPERM                 -3
 483 #define ZEBRA_ERR_RTNOEXIST             -4
 484 #define ZEBRA_ERR_KERNEL                -5
 485
 486 /* Zebra message flags */
 487 #define ZEBRA_FLAG_INTERNAL           0x01
 488 #define ZEBRA_FLAG_SELFROUTE          0x02
 489 #define ZEBRA_FLAG_BLACKHOLE          0x04
 490 #define ZEBRA_FLAG_IBGP               0x08
 491 #define ZEBRA_FLAG_SELECTED           0x10
 492 #define ZEBRA_FLAG_STATIC             0x40
 493 #define ZEBRA_FLAG_REJECT             0x80
 494 #define ZEBRA_FLAG_SCOPE_LINK         0x100
 495
 496 /* Zebra nexthop flags. */
 497 #define ZEBRA_NEXTHOP_IFINDEX            1
 498 #define ZEBRA_NEXTHOP_IPV4               2
 499 #define ZEBRA_NEXTHOP_IPV4_IFINDEX       3
 500 #define ZEBRA_NEXTHOP_IPV6               4
 501 #define ZEBRA_NEXTHOP_IPV6_IFINDEX       5
 502 #define ZEBRA_NEXTHOP_BLACKHOLE          6
 503 #define ZEBRA_NEXTHOP_IPV4_ONLINK        7
 504
 505 #ifndef INADDR_LOOPBACK
 506 #define INADDR_LOOPBACK 0x7f000001      /* Internet address 127.0.0.1.  */
 507 #endif
 508
 509 /* Address family numbers from RFC1700. */
 510 typedef enum {
 511   AFI_IP  = 1,
 512   AFI_IP6 = 2,
 513 #define AFI_MAX 3
 514 } afi_t;
 515
 516 /* Subsequent Address Family Identifier. */
 517 #define SAFI_UNICAST              1
 518 #define SAFI_MULTICAST            2
 519 #define SAFI_RESERVED_3           3
 520 #define SAFI_MPLS_VPN             4
 521 #define SAFI_ENCAP                7 /* per IANA */
 522 #define SAFI_MAX                  8
 523
 524 /* Default Administrative Distance of each protocol. */
 525 #define ZEBRA_KERNEL_DISTANCE_DEFAULT      0
 526 #define ZEBRA_CONNECT_DISTANCE_DEFAULT     0
 527 #define ZEBRA_STATIC_DISTANCE_DEFAULT      1
 528 #define ZEBRA_RIP_DISTANCE_DEFAULT       120
 529 #define ZEBRA_RIPNG_DISTANCE_DEFAULT     120
 530 #define ZEBRA_OSPF_DISTANCE_DEFAULT      110
 531 #define ZEBRA_OSPF6_DISTANCE_DEFAULT     110
 532 #define ZEBRA_ISIS_DISTANCE_DEFAULT      115
 533 #define ZEBRA_IBGP_DISTANCE_DEFAULT      200
 534 #define ZEBRA_EBGP_DISTANCE_DEFAULT       20
 535 #define ZEBRA_TABLE_DISTANCE_DEFAULT      15
 536
 537 /* Flag manipulation macros. */
 538 #define CHECK_FLAG(V,F)      ((V) & (F))
 539 #define SET_FLAG(V,F)        (V) |= (F)
 540 #define UNSET_FLAG(V,F)      (V) &= ~(F)
 541 #define RESET_FLAG(V)        (V) = 0
 542
 543 typedef u_int8_t safi_t;
 544
 545 /* Zebra types. Used in Zserv message header. */
 546 typedef u_int16_t zebra_size_t;
 547 typedef u_int16_t zebra_command_t;
 548
 549 /* VRF ID type. */
 550 typedef u_int16_t vrf_id_t;
 551
 552 /* FIFO -- first in first out structure and macros.  */
 553 struct fifo
 554 {
 555   struct fifo *next;
 556   struct fifo *prev;
 557 };
 558
 559 #define FIFO_INIT(F)                                  \
 560   do {                                                \
 561     struct fifo *Xfifo = (struct fifo *)(F);          \
 562     Xfifo->next = Xfifo->prev = Xfifo;                \
 563   } while (0)
 564
 565 #define FIFO_ADD(F,N)                                 \
 566   do {                                                \
 567     struct fifo *Xfifo = (struct fifo *)(F);          \
 568     struct fifo *Xnode = (struct fifo *)(N);          \
 569     Xnode->next = Xfifo;                              \
 570     Xnode->prev = Xfifo->prev;                        \
 571     Xfifo->prev = Xfifo->prev->next = Xnode;          \
 572   } while (0)
 573
 574 #define FIFO_DEL(N)                                   \
 575   do {                                                \
 576     struct fifo *Xnode = (struct fifo *)(N);          \
 577     Xnode->prev->next = Xnode->next;                  \
 578     Xnode->next->prev = Xnode->prev;                  \
 579   } while (0)
 580
 581 #define FIFO_HEAD(F)                                  \
 582   ((((struct fifo *)(F))->next == (struct fifo *)(F)) \
 583   ? NULL : (F)->next)
 584
 585 #define FIFO_EMPTY(F)                                 \
 586   (((struct fifo *)(F))->next == (struct fifo *)(F))
 587
 588 #define FIFO_TOP(F)                                   \
 589   (FIFO_EMPTY(F) ? NULL : ((struct fifo *)(F))->next)
 590
 591 #endif /* _ZEBRA_H */