build: massively remove needless checks

[mirror_frr.git] / lib / zebra.h

/* Zebra common header.
   Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Kunihiro Ishiguro

This file is part of GNU Zebra.

GNU Zebra is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

GNU Zebra is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Zebra; see the file COPYING.  If not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */

#ifndef _ZEBRA_H
#define _ZEBRA_H

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */

#ifdef SUNOS_5
#define _XPG4_2
typedef unsigned int    u_int32_t;
typedef unsigned short  u_int16_t;
typedef unsigned char   u_int8_t;
#endif /* SUNOS_5 */

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <string.h>
#include <pwd.h>
#include <grp.h>
#ifdef HAVE_STROPTS_H
#include <stropts.h>
#endif /* HAVE_STROPTS_H */
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/param.h>
#ifdef HAVE_SYS_SYSCTL_H
#ifdef GNU_LINUX
#include <linux/types.h>
#endif
#include <sys/sysctl.h>
#endif /* HAVE_SYS_SYSCTL_H */
#include <sys/ioctl.h>
#ifdef HAVE_SYS_CONF_H
#include <sys/conf.h>
#endif /* HAVE_SYS_CONF_H */
#ifdef HAVE_SYS_KSYM_H
#include <sys/ksym.h>
#endif /* HAVE_SYS_KSYM_H */
#include <syslog.h>
#include <sys/time.h>
#include <time.h>
#include <sys/uio.h>
#include <sys/utsname.h>
#include <sys/resource.h>
#include <limits.h>
#include <inttypes.h>
#include <stdbool.h>

/* machine dependent includes */
#ifdef SUNOS_5
#include <strings.h>
#endif /* SUNOS_5 */

/* machine dependent includes */
#ifdef HAVE_LINUX_VERSION_H
#include <linux/version.h>
#endif /* HAVE_LINUX_VERSION_H */

#ifdef HAVE_ASM_TYPES_H
#include <asm/types.h>
#endif /* HAVE_ASM_TYPES_H */

/* misc include group */
#include <stdarg.h>
#if !(defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L)
/* Not C99; do we need to define va_copy? */
#ifndef va_copy
#ifdef __va_copy
#define va_copy(DST,SRC) __va_copy(DST,SRC)
#else
/* Now we are desperate; this should work on many typical platforms. 
   But this is slightly dangerous, because the standard does not require
   va_copy to be a macro. */
#define va_copy(DST,SRC) memcpy(&(DST), &(SRC), sizeof(va_list))
#warning "Not C99 and no va_copy macro available, falling back to memcpy"
#endif /* __va_copy */
#endif /* !va_copy */
#endif /* !C99 */


#ifdef HAVE_LCAPS
#include <sys/capability.h>
#include <sys/prctl.h>
#endif /* HAVE_LCAPS */

#ifdef HAVE_SOLARIS_CAPABILITIES
#include <priv.h>
#endif /* HAVE_SOLARIS_CAPABILITIES */

/* network include group */

#include <sys/socket.h>

#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif /* HAVE_SYS_SOCKIO_H */

#ifdef __APPLE__
#define __APPLE_USE_RFC_3542
#endif

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>

#ifdef HAVE_NET_NETOPT_H
#include <net/netopt.h>
#endif /* HAVE_NET_NETOPT_H */

#include <net/if.h>

#ifdef HAVE_NET_IF_DL_H
#include <net/if_dl.h>
#endif /* HAVE_NET_IF_DL_H */

#ifdef HAVE_NET_IF_VAR_H
#include <net/if_var.h>
#endif /* HAVE_NET_IF_VAR_H */

#include <net/route.h>

#ifdef HAVE_NETLINK
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/filter.h>
#else
#define RT_TABLE_MAIN		0
#endif /* HAVE_NETLINK */

#include <netdb.h>
#include <arpa/inet.h>

#ifdef HAVE_INET_ND_H
#include <inet/nd.h>
#endif /* HAVE_INET_ND_H */

#ifdef HAVE_NETINET_IN_VAR_H
#include <netinet/in_var.h>
#endif /* HAVE_NETINET_IN_VAR_H */

#ifdef HAVE_NETINET6_IN6_VAR_H
#include <netinet6/in6_var.h>
#endif /* HAVE_NETINET6_IN6_VAR_H */

#ifdef HAVE_NETINET_IN6_VAR_H
#include <netinet/in6_var.h>
#endif /* HAVE_NETINET_IN6_VAR_H */

#ifdef HAVE_NETINET6_IN_H
#include <netinet6/in.h>
#endif /* HAVE_NETINET6_IN_H */


#ifdef HAVE_NETINET6_IP6_H
#include <netinet6/ip6.h>
#endif /* HAVE_NETINET6_IP6_H */

#include <netinet/icmp6.h>

#ifdef HAVE_NETINET6_ND6_H
#include <netinet6/nd6.h>
#endif /* HAVE_NETINET6_ND6_H */

/* Some systems do not define UINT32_MAX, etc.. from inttypes.h
 * e.g. this makes life easier for FBSD 4.11 users.
 */
#ifndef INT8_MAX
#define INT8_MAX	(127)
#endif
#ifndef INT16_MAX
#define INT16_MAX	(32767)
#endif
#ifndef INT32_MAX
#define INT32_MAX	(2147483647)
#endif
#ifndef UINT8_MAX
#define UINT8_MAX	(255U)
#endif
#ifndef UINT16_MAX
#define UINT16_MAX	(65535U)
#endif
#ifndef UINT32_MAX
#define UINT32_MAX	(4294967295U)
#endif

#ifdef HAVE_GLIBC_BACKTRACE
#include <execinfo.h>
#endif /* HAVE_GLIBC_BACKTRACE */

/* Local includes: */
#if !(defined(__GNUC__) || defined(VTYSH_EXTRACT_PL)) 
#define __attribute__(x)
#endif  /* !__GNUC__ || VTYSH_EXTRACT_PL */

#include "zassert.h"
#include "str.h"


#ifdef HAVE_BROKEN_CMSG_FIRSTHDR
/* This bug is present in Solaris 8 and pre-patch Solaris 9 <sys/socket.h>;
   please refer to http://bugzilla.quagga.net/show_bug.cgi?id=142 */

/* Check that msg_controllen is large enough. */
#define ZCMSG_FIRSTHDR(mhdr) \
  (((size_t)((mhdr)->msg_controllen) >= sizeof(struct cmsghdr)) ? \
   CMSG_FIRSTHDR(mhdr) : (struct cmsghdr *)NULL)

#warning "CMSG_FIRSTHDR is broken on this platform, using a workaround"

#else /* HAVE_BROKEN_CMSG_FIRSTHDR */
#define ZCMSG_FIRSTHDR(M) CMSG_FIRSTHDR(M)
#endif /* HAVE_BROKEN_CMSG_FIRSTHDR */



/* 
 * RFC 3542 defines several macros for using struct cmsghdr.
 * Here, we define those that are not present
 */

/*
 * Internal defines, for use only in this file.
 * These are likely wrong on other than ILP32 machines, so warn.
 */
#ifndef _CMSG_DATA_ALIGN
#define _CMSG_DATA_ALIGN(n)           (((n) + 3) & ~3)
#endif /* _CMSG_DATA_ALIGN */

#ifndef _CMSG_HDR_ALIGN
#define _CMSG_HDR_ALIGN(n)            (((n) + 3) & ~3)
#endif /* _CMSG_HDR_ALIGN */

/*
 * CMSG_SPACE and CMSG_LEN are required in RFC3542, but were new in that
 * version.
 */
#ifndef CMSG_SPACE
#define CMSG_SPACE(l)       (_CMSG_DATA_ALIGN(sizeof(struct cmsghdr)) + \
                              _CMSG_HDR_ALIGN(l))
#warning "assuming 4-byte alignment for CMSG_SPACE"
#endif  /* CMSG_SPACE */


#ifndef CMSG_LEN
#define CMSG_LEN(l)         (_CMSG_DATA_ALIGN(sizeof(struct cmsghdr)) + (l))
#warning "assuming 4-byte alignment for CMSG_LEN"
#endif /* CMSG_LEN */


/*  The definition of struct in_pktinfo is missing in old version of
    GLIBC 2.1 (Redhat 6.1).  */
#if defined (GNU_LINUX) && ! defined (HAVE_STRUCT_IN_PKTINFO)
struct in_pktinfo
{
  int ipi_ifindex;
  struct in_addr ipi_spec_dst;
  struct in_addr ipi_addr;
};
#endif

/* 
 * IP_HDRINCL / struct ip byte order
 *
 * Linux: network byte order
 * *BSD: network, except for length and offset. (cf Stevens)
 * SunOS: nominally as per BSD. but bug: network order on LE.
 * OpenBSD: network byte order, apart from older versions which are as per 
 *          *BSD
 */
#if defined(__NetBSD__) \
   || (defined(__FreeBSD__) && (__FreeBSD_version < 1100030)) \
   || (defined(__OpenBSD__) && (OpenBSD < 200311)) \
   || (defined(__APPLE__)) \
   || (defined(SUNOS_5) && defined(WORDS_BIGENDIAN))
#define HAVE_IP_HDRINCL_BSD_ORDER
#endif

/* Define BYTE_ORDER, if not defined. Useful for compiler conditional
 * code, rather than preprocessor conditional.
 * Not all the world has this BSD define.
 */
#ifndef BYTE_ORDER
#define BIG_ENDIAN	4321	/* least-significant byte first (vax, pc) */
#define LITTLE_ENDIAN	1234	/* most-significant byte first (IBM, net) */
#define PDP_ENDIAN	3412	/* LSB first in word, MSW first in long (pdp) */

#if defined(WORDS_BIGENDIAN)
#define BYTE_ORDER	BIG_ENDIAN
#else /* !WORDS_BIGENDIAN */
#define BYTE_ORDER	LITTLE_ENDIAN
#endif /* WORDS_BIGENDIAN */

#endif /* ndef BYTE_ORDER */

/* MAX / MIN are not commonly defined, but useful */
/* note: glibc sys/param.h has #define MIN(a,b) (((a)<(b))?(a):(b)) */
#ifdef MAX
#undef MAX
#endif
#define MAX(a, b) \
	({ typeof (a) _a = (a); \
	   typeof (b) _b = (b); \
	   _a > _b ? _a : _b; })
#ifdef MIN
#undef MIN
#endif
#define MIN(a, b) \
	({ typeof (a) _a = (a); \
	   typeof (b) _b = (b); \
	   _a < _b ? _a : _b; })

#define ZEBRA_NUM_OF(x) (sizeof (x) / sizeof (x[0]))

/* For old definition. */
#ifndef IN6_ARE_ADDR_EQUAL
#define IN6_ARE_ADDR_EQUAL IN6_IS_ADDR_EQUAL
#endif /* IN6_ARE_ADDR_EQUAL */

/* default zebra TCP port for zclient */
#define ZEBRA_PORT			2600

/* Zebra message types. */
typedef enum {
  ZEBRA_INTERFACE_ADD,
  ZEBRA_INTERFACE_DELETE,
  ZEBRA_INTERFACE_ADDRESS_ADD,
  ZEBRA_INTERFACE_ADDRESS_DELETE,
  ZEBRA_INTERFACE_UP,
  ZEBRA_INTERFACE_DOWN,
  ZEBRA_IPV4_ROUTE_ADD,
  ZEBRA_IPV4_ROUTE_DELETE,
  ZEBRA_IPV6_ROUTE_ADD,
  ZEBRA_IPV6_ROUTE_DELETE,
  ZEBRA_REDISTRIBUTE_ADD,
  ZEBRA_REDISTRIBUTE_DELETE,
  ZEBRA_REDISTRIBUTE_DEFAULT_ADD,
  ZEBRA_REDISTRIBUTE_DEFAULT_DELETE,
  ZEBRA_ROUTER_ID_ADD,
  ZEBRA_ROUTER_ID_DELETE,
  ZEBRA_ROUTER_ID_UPDATE,
  ZEBRA_HELLO,
  ZEBRA_NEXTHOP_REGISTER,
  ZEBRA_NEXTHOP_UNREGISTER,
  ZEBRA_NEXTHOP_UPDATE,
  ZEBRA_INTERFACE_NBR_ADDRESS_ADD,
  ZEBRA_INTERFACE_NBR_ADDRESS_DELETE,
  ZEBRA_INTERFACE_BFD_DEST_UPDATE,
  ZEBRA_IMPORT_ROUTE_REGISTER,
  ZEBRA_IMPORT_ROUTE_UNREGISTER,
  ZEBRA_IMPORT_CHECK_UPDATE,
  ZEBRA_IPV4_ROUTE_IPV6_NEXTHOP_ADD,
  ZEBRA_BFD_DEST_REGISTER,
  ZEBRA_BFD_DEST_DEREGISTER,
  ZEBRA_BFD_DEST_UPDATE,
  ZEBRA_BFD_DEST_REPLAY,
  ZEBRA_REDISTRIBUTE_IPV4_ADD,
  ZEBRA_REDISTRIBUTE_IPV4_DEL,
  ZEBRA_REDISTRIBUTE_IPV6_ADD,
  ZEBRA_REDISTRIBUTE_IPV6_DEL,
  ZEBRA_VRF_UNREGISTER,
  ZEBRA_VRF_ADD,
  ZEBRA_VRF_DELETE,
  ZEBRA_INTERFACE_VRF_UPDATE,
  ZEBRA_BFD_CLIENT_REGISTER,
  ZEBRA_INTERFACE_ENABLE_RADV,
  ZEBRA_INTERFACE_DISABLE_RADV,
  ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB,
  ZEBRA_INTERFACE_LINK_PARAMS,
  ZEBRA_MPLS_LABELS_ADD,
  ZEBRA_MPLS_LABELS_DELETE,
  ZEBRA_IPV4_NEXTHOP_ADD,
  ZEBRA_IPV4_NEXTHOP_DELETE,
  ZEBRA_IPV6_NEXTHOP_ADD,
  ZEBRA_IPV6_NEXTHOP_DELETE,
} zebra_message_types_t;

/* Marker value used in new Zserv, in the byte location corresponding
 * the command value in the old zserv header. To allow old and new
 * Zserv headers to be distinguished from each other.
 */
#define ZEBRA_HEADER_MARKER              255

/* Zebra route's types are defined in route_types.h */
#include "route_types.h"

/* Note: whenever a new route-type or zserv-command is added the
 * corresponding {command,route}_types[] table in lib/log.c MUST be
 * updated! */

/* Map a route type to a string.  For example, ZEBRA_ROUTE_RIPNG -> "ripng". */
extern const char *zebra_route_string(unsigned int route_type);
/* Map a route type to a char.  For example, ZEBRA_ROUTE_RIPNG -> 'R'. */
extern char zebra_route_char(unsigned int route_type);
/* Map a zserv command type to the same string, 
 * e.g. ZEBRA_INTERFACE_ADD -> "ZEBRA_INTERFACE_ADD" */
/* Map a protocol name to its number. e.g. ZEBRA_ROUTE_BGP->9*/
extern int proto_name2num(const char *s);
/* Map redistribute X argument to protocol number.
 * unlike proto_name2num, this accepts shorthands and takes
 * an AFI value to restrict input */
extern int proto_redistnum(int afi, const char *s);

extern const char *zserv_command_string (unsigned int command);

/* Error codes of zebra. */
#define ZEBRA_ERR_NOERROR                0
#define ZEBRA_ERR_RTEXIST               -1
#define ZEBRA_ERR_RTUNREACH             -2
#define ZEBRA_ERR_EPERM                 -3
#define ZEBRA_ERR_RTNOEXIST             -4
#define ZEBRA_ERR_KERNEL                -5

/* Zebra message flags */
#define ZEBRA_FLAG_INTERNAL           0x01
#define ZEBRA_FLAG_SELFROUTE          0x02
#define ZEBRA_FLAG_BLACKHOLE          0x04
#define ZEBRA_FLAG_IBGP               0x08
#define ZEBRA_FLAG_SELECTED           0x10
#define ZEBRA_FLAG_STATIC             0x40
#define ZEBRA_FLAG_REJECT             0x80
#define ZEBRA_FLAG_SCOPE_LINK         0x100
#define ZEBRA_FLAG_FIB_OVERRIDE       0x200

#ifndef INADDR_LOOPBACK
#define	INADDR_LOOPBACK	0x7f000001	/* Internet address 127.0.0.1.  */
#endif

/* Address family numbers from RFC1700. */
typedef enum {
  AFI_IP  = 1,
  AFI_IP6 = 2,
  AFI_ETHER = 3,                /* RFC 1700 has "6" for 802.* */
  AFI_MAX = 4
} afi_t;

/* Subsequent Address Family Identifier. */
#define SAFI_UNICAST              1
#define SAFI_MULTICAST            2
#define SAFI_RESERVED_3           3
#define SAFI_MPLS_VPN             4
#define SAFI_ENCAP		  7 /* per IANA */
#define SAFI_MAX                  8

/* Default Administrative Distance of each protocol. */
#define ZEBRA_KERNEL_DISTANCE_DEFAULT      0
#define ZEBRA_CONNECT_DISTANCE_DEFAULT     0
#define ZEBRA_STATIC_DISTANCE_DEFAULT      1
#define ZEBRA_RIP_DISTANCE_DEFAULT       120
#define ZEBRA_RIPNG_DISTANCE_DEFAULT     120
#define ZEBRA_OSPF_DISTANCE_DEFAULT      110
#define ZEBRA_OSPF6_DISTANCE_DEFAULT     110
#define ZEBRA_ISIS_DISTANCE_DEFAULT      115
#define ZEBRA_IBGP_DISTANCE_DEFAULT      200
#define ZEBRA_EBGP_DISTANCE_DEFAULT       20
#define ZEBRA_TABLE_DISTANCE_DEFAULT      15

/* Flag manipulation macros. */
#define CHECK_FLAG(V,F)      ((V) & (F))
#define SET_FLAG(V,F)        (V) |= (F)
#define UNSET_FLAG(V,F)      (V) &= ~(F)
#define RESET_FLAG(V)        (V) = 0

typedef u_int8_t safi_t;

/* Zebra types. Used in Zserv message header. */
typedef u_int16_t zebra_size_t;
typedef u_int16_t zebra_command_t;

/* VRF ID type. */
typedef u_int16_t vrf_id_t;

typedef uint32_t route_tag_t;
#define ROUTE_TAG_MAX UINT32_MAX
#define ROUTE_TAG_PRI PRIu32

#endif /* _ZEBRA_H */