bgpd.h

linux 路由软件 可支持RIP OSPF BGP等

/* BGP message definition header.
   Copyright (C) 1996, 97, 98, 99, 2000 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.  */

/* For union sockunion.  */
#include "sockunion.h"

/* ZEBRA BGPd Version */
#define ZEBRA_BGPD_VERSION "0.95 build 25"

/* Typedef BGP specific types.  */
typedef u_int16_t as_t;
typedef u_int16_t bgp_size_t;

/* BGP master for system wide configurations and variables.  */
struct bgp_master
{
  /* BGP instance list.  */
  struct list *bgp;

  /* BGP thread master.  */
  struct thread_master *master;

  /* BGP port number.  */
  u_int16_t port;

  /* BGP start time.  */
  time_t start_time;

  /* Various BGP global configuration.  */
  u_char options;
#define BGP_OPT_NO_FIB                   (1 << 0)
#define BGP_OPT_MULTIPLE_INSTANCE        (1 << 1)
#define BGP_OPT_CONFIG_CISCO             (1 << 2)

#ifdef HAVE_TCP_SIGNATURE
  /* bgp receive socket */
  int sock;
#endif /* HAVE_TCP_SIGNATURE */
};

/* BGP instance structure.  */
struct bgp 
{
  /* AS number of this BGP instance.  */
  as_t as;

  /* Name of this BGP instance.  */
  char *name;

  /* Self peer.  */
  struct peer *peer_self;

  /* BGP peer. */
  struct list *peer;

  /* BGP peer group.  */
  struct list *group;

  /* BGP configuration.  */
  u_int16_t config;
#define BGP_CONFIG_ROUTER_ID              (1 << 0)
#define BGP_CONFIG_CLUSTER_ID             (1 << 1)
#define BGP_CONFIG_CONFEDERATION          (1 << 2)

  /* BGP router identifier.  */
  struct in_addr router_id;

  /* BGP route reflector cluster ID.  */
  struct in_addr cluster_id;

  /* BGP confederation information.  */
  as_t confed_id;
  as_t *confed_peers;
  int confed_peers_cnt;

  /* BGP flags. */
  u_int16_t flags;
#define BGP_FLAG_ALWAYS_COMPARE_MED       (1 << 0)
#define BGP_FLAG_DETERMINISTIC_MED        (1 << 1)
#define BGP_FLAG_MED_MISSING_AS_WORST     (1 << 2)
#define BGP_FLAG_MED_CONFED               (1 << 3)
#define BGP_FLAG_NO_DEFAULT_IPV4          (1 << 4)
#define BGP_FLAG_NO_CLIENT_TO_CLIENT      (1 << 5)
#define BGP_FLAG_NO_ENFORCE_FIRST_AS      (1 << 6)
#define BGP_FLAG_COMPARE_ROUTER_ID        (1 << 7)
#define BGP_FLAG_ASPATH_IGNORE            (1 << 8)
#define BGP_FLAG_IMPORT_CHECK             (1 << 9)
#define BGP_FLAG_NO_FAST_EXT_FAILOVER     (1 << 10)
#define BGP_FLAG_LOG_NEIGHBOR_CHANGES     (1 << 11)
#define BGP_FLAG_GRACEFUL_RESTART         (1 << 12)
#define BGP_FLAG_COST_COMMUNITY_IGNORE    (1 << 13)

  /* BGP Per AF flags */
  u_int16_t af_flags[AFI_MAX][SAFI_MAX];
#define BGP_CONFIG_DAMPENING              (1 << 0)

  /* Static route configuration.  */
  struct bgp_table *route[AFI_MAX][SAFI_MAX];

  /* Aggregate address configuration.  */
  struct bgp_table *aggregate[AFI_MAX][SAFI_MAX];

  /* BGP routing information base.  */
  struct bgp_table *rib[AFI_MAX][SAFI_MAX];

  /* BGP redistribute configuration. */
  u_char redist[AFI_MAX][ZEBRA_ROUTE_MAX];

  /* BGP redistribute metric configuration. */
  u_char redist_metric_flag[AFI_MAX][ZEBRA_ROUTE_MAX];
  u_int32_t redist_metric[AFI_MAX][ZEBRA_ROUTE_MAX];

  /* BGP redistribute route-map.  */
  struct
  {
    char *name;
    struct route_map *map;
  } rmap[AFI_MAX][ZEBRA_ROUTE_MAX];

  /* BGP distance configuration.  */
  u_char distance_ebgp;
  u_char distance_ibgp;
  u_char distance_local;
  
  /* BGP default local-preference.  */
  u_int32_t default_local_pref;

  /* BGP default timer.  */
  u_int32_t default_holdtime;
  u_int32_t default_keepalive;

  /* BGP graceful restart */
  u_int32_t restart_time;
  u_int32_t stalepath_time;
};

/* BGP peer-group support. */
struct peer_group
{
  /* Name of the peer-group. */
  char *name;

  /* Pointer to BGP.  */
  struct bgp *bgp;
  
  /* Peer-group client list. */
  struct list *peer;

  /* Peer-group config */
  struct peer *conf;
};

/* BGP Notify message format. */
struct bgp_notify 
{
  u_char code;
  u_char subcode;
  char *data;
  bgp_size_t length;
};

/* Next hop self address. */
struct bgp_nexthop
{
  struct interface *ifp;
  struct in_addr v4;
#ifdef HAVE_IPV6
  struct in6_addr v6_global;
  struct in6_addr v6_local;
#endif /* HAVE_IPV6 */  
};

/* BGP router distinguisher value.  */
#define BGP_RD_SIZE                8

struct bgp_rd
{
  u_char val[BGP_RD_SIZE];
};

/* BGP filter structure. */
struct bgp_filter
{
  /* Distribute-list.  */
  struct 
  {
    char *name;
    struct access_list *alist;
  } dlist[FILTER_MAX];

  /* Prefix-list.  */
  struct
  {
    char *name;
    struct prefix_list *plist;
  } plist[FILTER_MAX];

  /* Filter-list.  */
  struct
  {
    char *name;
    struct as_list *aslist;
  } aslist[FILTER_MAX];

  /* Route-map.  */
  struct
  {
    char *name;
    struct route_map *map;
  } map[FILTER_MAX];

  /* Unsuppress-map.  */
  struct
  {
    char *name;
    struct route_map *map;
  } usmap;
};

/* BGP neighbor structure. */
struct peer
{
  /* BGP structure.  */
  struct bgp *bgp;

  /* BGP peer group.  */
  struct peer_group *group;

  /* Peer's remote AS number. */
  as_t as;			

  /* Peer's local AS number. */
  as_t local_as;

  /* Peer's Change local AS number. */
  as_t change_local_as;

  /* Remote router ID. */
  struct in_addr remote_id;

  /* Local router ID. */
  struct in_addr local_id;

  /* Packet receive and send buffer. */
  struct stream *ibuf;
  struct stream_fifo *obuf;
  struct stream *work;

  /* Status of the peer. */
  int status;
  int ostatus;

  /* Peer information */
  int fd;			/* File descriptor */
  int ttl;			/* TTL of TCP connection to the peer. */
  char *desc;			/* Description of the peer. */
  unsigned short port;          /* Destination port for peer */
  char *host;			/* Printable address of the peer. */
  union sockunion su;		/* Sockunion address of the peer. */
  time_t uptime;		/* Last Up/Down time */
  time_t readtime;		/* Last read time */
  time_t resettime;		/* Last reset time */
  
  unsigned int ifindex;		/* ifindex of the BGP connection. */
  char *ifname;			/* bind interface name. */
  char *update_if;
  union sockunion *update_source;
  struct zlog *log;

  union sockunion *su_local;	/* Sockunion of local address.  */
  union sockunion *su_remote;	/* Sockunion of remote address.  */
  int shared_network;		/* Is this peer shared same network. */
  struct bgp_nexthop nexthop;	/* Nexthop */

  /* Peer address family configuration. */
  u_char afc[AFI_MAX][SAFI_MAX];
  u_char afc_nego[AFI_MAX][SAFI_MAX];
  u_char afc_adv[AFI_MAX][SAFI_MAX];
  u_char afc_recv[AFI_MAX][SAFI_MAX];

  /* Capability flags (reset in bgp_stop) */
  u_char cap;
#define PEER_CAP_REFRESH_ADV                (1 << 0) /* refresh advertised */
#define PEER_CAP_REFRESH_OLD_RCV            (1 << 1) /* refresh old received */
#define PEER_CAP_REFRESH_NEW_RCV            (1 << 2) /* refresh rfc received */
#define PEER_CAP_DYNAMIC_ADV                (1 << 3) /* dynamic advertised */
#define PEER_CAP_DYNAMIC_RCV                (1 << 4) /* dynamic received */
#define PEER_CAP_RESTART_ADV                (1 << 5) /* restart advertised */
#define PEER_CAP_RESTART_RCV                (1 << 6) /* restart received */