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7569ae8bb7
mirror_frr/lib/zebra.h
Timo Teräs 7569ae8bb7 zebra: support FIB override routes 
FIB override routes are for routing protocols that establish
shortcut routes, or establish point-to-point routes that should
not be redistributed. Namely this is useful NHRP daemon to come.

Zebra is extended to select two entries from RIB the "best" entry
from routing protocols, and the FIB entry to install to kernel.
FIB override routes are never selected as best entry, and thus
are never adverticed to other routing daemons. The best FIB
override, or if it does not exist the otherwise best RIB is
selected as FIB entry to be installed.

Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Acked-by: Donald Sharp <sharpd@cumulusnetworks.com>
[CF: Massage to fit cumulus tree]
Signed-off-by: Christian Franke <chris@opensourcerouting.org>
2016-09-23 09:51:57 -04:00

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/* 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 */
#ifndef HAVE_SOCKLEN_T
typedef int socklen_t;
#endif /* HAVE_SOCKLEN_T */
#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 */
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif /* HAVE_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>
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif /* TIME_WITH_SYS_TIME */
#include <sys/uio.h>
#include <sys/utsname.h>
#ifdef HAVE_RUSAGE
#include <sys/resource.h>
#endif /* HAVE_RUSAGE */
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif /* HAVE_LIMITS_H */
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif /* HAVE_INTTYPES_H */
#ifdef HAVE_STDBOOL_H
#include <stdbool.h>
#endif
/* 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
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif /* HAVE_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 */
#ifdef HAVE_NET_ROUTE_H
#include <net/route.h>
#endif /* HAVE_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 */
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif /* HAVE_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 */
#ifdef HAVE_NETINET_ICMP6_H
#include <netinet/icmp6.h>
#endif /* HAVE_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 */
#ifndef MAX
#define MAX(a, b) \
({ typeof (a) _a = (a); \
typeof (b) _b = (b); \
_a > _b ? _a : _b; })
#endif
#ifndef MIN
#define MIN(a, b) \
({ typeof (a) _a = (a); \
typeof (b) _b = (b); \
_a < _b ? _a : _b; })
#endif
#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_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;
#endif /* _ZEBRA_H */
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