bgpd.h

大名鼎鼎的路由器源码。程序分ZEBRA、OSPFRIP等3个包。程序框架采用一个路由协议一个进程的方式

/* 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"

/* 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)
};

/* 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)
#define BGP_CONFIG_DEFAULT_LOCAL_PREF     (1 << 3)

  /* 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_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)

  /* 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 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;
  u_char af_group[AFI_MAX][SAFI_MAX];

  /* 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;
  u_char version;		/* Peer BGP version. */

  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.*/
  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 */

  /* Capability Flags.*/
  u_int16_t af_cap[AFI_MAX][SAFI_MAX];
#define PEER_CAP_ORF_PREFIX_SM_ADV          (1 << 0) /* send-mode advertised */
#define PEER_CAP_ORF_PREFIX_RM_ADV          (1 << 1) /* receive-mode advertised */
#define PEER_CAP_ORF_PREFIX_SM_RCV          (1 << 2) /* send-mode received */
#define PEER_CAP_ORF_PREFIX_RM_RCV          (1 << 3) /* receive-mode received */
#define PEER_CAP_ORF_PREFIX_SM_OLD_RCV      (1 << 4) /* send-mode received */
#define PEER_CAP_ORF_PREFIX_RM_OLD_RCV      (1 << 5) /* receive-mode received */

  /* Global configuration flags. */
  u_int32_t flags;
#define PEER_FLAG_PASSIVE                   (1 << 0) /* passive mode */
#define PEER_FLAG_SHUTDOWN                  (1 << 1) /* shutdown */
#define PEER_FLAG_DONT_CAPABILITY           (1 << 2) /* dont-capability */
#define PEER_FLAG_OVERRIDE_CAPABILITY       (1 << 3) /* override-capability */
#define PEER_FLAG_STRICT_CAP_MATCH          (1 << 4) /* strict-match */
#define PEER_FLAG_NO_ROUTE_REFRESH_CAP      (1 << 5) /* route-refresh */
#define PEER_FLAG_DYNAMIC_CAPABILITY        (1 << 6) /* dynamic capability */
#define PEER_FLAG_ENFORCE_MULTIHOP          (1 << 7) /* enforce-multihop */
#define PEER_FLAG_LOCAL_AS_NO_PREPEND       (1 << 8) /* local-as no-prepend */

  /* Per AF configuration flags. */
  u_int32_t af_flags[AFI_MAX][SAFI_MAX];
#define PEER_FLAG_SEND_COMMUNITY            (1 << 0) /* send-community */
#define PEER_FLAG_SEND_EXT_COMMUNITY        (1 << 1) /* send-community ext. */
#define PEER_FLAG_NEXTHOP_SELF              (1 << 2) /* next-hop-self */
#define PEER_FLAG_REFLECTOR_CLIENT          (1 << 3) /* reflector-client */
#define PEER_FLAG_RSERVER_CLIENT            (1 << 4) /* route-server-client */
#define PEER_FLAG_SOFT_RECONFIG             (1 << 5) /* soft-reconfiguration */
#define PEER_FLAG_AS_PATH_UNCHANGED         (1 << 6) /* transparent-as */
#define PEER_FLAG_NEXTHOP_UNCHANGED         (1 << 7) /* transparent-next-hop */
#define PEER_FLAG_MED_UNCHANGED             (1 << 8) /* transparent-next-hop */
#define PEER_FLAG_DEFAULT_ORIGINATE         (1 << 9) /* default-originate */
#define PEER_FLAG_REMOVE_PRIVATE_AS         (1 << 10) /* remove-private-as */
#define PEER_FLAG_ALLOWAS_IN                (1 << 11) /* set allowas-in */
#define PEER_FLAG_ORF_PREFIX_SM             (1 << 12) /* orf capability send-mode */
#define PEER_FLAG_ORF_PREFIX_RM             (1 << 13) /* orf capability receive-mode */
#define PEER_FLAG_MAX_PREFIX                (1 << 14) /* maximum prefix */
#define PEER_FLAG_MAX_PREFIX_WARNING        (1 << 15) /* maximum prefix warning-only */

  /* default-originate route-map.  */
  struct
  {
    char *name;
    struct route_map *map;
  } default_rmap[AFI_MAX][SAFI_MAX];

  /* Peer status flags. */
  u_int16_t sflags;
#define PEER_STATUS_ACCEPT_PEER	      (1 << 0) /* accept peer */
#define PEER_STATUS_PREFIX_OVERFLOW   (1 << 1) /* prefix-overflow */
#define PEER_STATUS_CAPABILITY_OPEN   (1 << 2) /* capability open send */
#define PEER_STATUS_HAVE_ACCEPT       (1 << 3) /* accept peer's parent */
#define PEER_STATUS_GROUP             (1 << 4) /* peer-group conf */

  /* Peer status af flags. */
  u_int16_t af_sflags[AFI_MAX][SAFI_MAX];
#define PEER_STATUS_ORF_PREFIX_SEND   (1 << 0) /* prefix-list send peer */
#define PEER_STATUS_ORF_WAIT_REFRESH  (1 << 1) /* wait refresh received peer */
#define PEER_STATUS_DEFAULT_ORIGINATE (1 << 2) /* default-originate peer */
#define PEER_STATUS_PREFIX_THRESHOLD  (1 << 3) /* exceed prefix-threshold */
#define PEER_STATUS_PREFIX_LIMIT      (1 << 4) /* exceed prefix-limit */

  /* Default attribute value for the peer. */
  u_int32_t config;
#define PEER_CONFIG_WEIGHT            (1 << 0) /* Default weight. */
#define PEER_CONFIG_TIMER             (1 << 1) /* keepalive & holdtime */
#define PEER_CONFIG_CONNECT           (1 << 2) /* connect */
#define PEER_CONFIG_ROUTEADV          (1 << 3) /* route advertise */
  u_int32_t weight;
  u_int32_t holdtime;
  u_int32_t keepalive;
  u_int32_t connect;
  u_int32_t routeadv;

  /* Timer values. */
  u_int32_t v_start;
  u_int32_t v_connect;
  u_int32_t v_holdtime;
  u_int32_t v_keepalive;
  u_int32_t v_asorig;
  u_int32_t v_routeadv;

  /* Threads. */
  struct thread *t_read;
  struct thread *t_write;
  struct thread *t_start;
  struct thread *t_connect;
  struct thread *t_holdtime;
  struct thread *t_keepalive;
  struct thread *t_asorig;
  struct thread *t_routeadv;

  /* Statistics field */
  u_int32_t open_in;		/* Open message input count */
  u_int32_t open_out;		/* Open message output count */
  u_int32_t update_in;		/* Update message input count */
  u_int32_t update_out;		/* Update message ouput count */
  time_t update_time;		/* Update message received time. */
  u_int32_t keepalive_in;	/* Keepalive input count */
  u_int32_t keepalive_out;	/* Keepalive output count */
  u_int32_t notify_in;		/* Notify input count */
  u_int32_t notify_out;		/* Notify output count */
  u_int32_t refresh_in;		/* Route Refresh input count */
  u_int32_t refresh_out;	/* Route Refresh output count */
  u_int32_t dynamic_cap_in;	/* Dynamic Capability input count.  */
  u_int32_t dynamic_cap_out;	/* Dynamic Capability output count.  */

  /* BGP state count */
  u_int32_t established;	/* Established */
  u_int32_t dropped;		/* Dropped */

  /* Syncronization list and time.  */
  struct bgp_synchronize *sync[AFI_MAX][SAFI_MAX];
  time_t synctime;

  /* Send prefix count. */
  unsigned long scount[AFI_MAX][SAFI_MAX];

  /* Announcement attribute hash.  */
  struct hash *hash[AFI_MAX][SAFI_MAX];

  /* Notify data. */
  struct bgp_notify notify;

  /* Whole packet size to be read. */
  unsigned long packet_size;

  /* Filter structure. */
  struct bgp_filter filter[AFI_MAX][SAFI_MAX];

  /* ORF Prefix-list */
  struct prefix_list *orf_plist[AFI_MAX][SAFI_MAX];

  /* Prefix count. */
  unsigned long pcount[AFI_MAX][SAFI_MAX];

  /* Max prefix count. */
  unsigned long pmax[AFI_MAX][SAFI_MAX];