proto/bgp/bgp.h

   1 /*
   2  *      BIRD -- The Border Gateway Protocol
   3  *
   4  *      (c) 2000 Martin Mares <mj@ucw.cz>
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL.
   7  */
   8
   9 #ifndef _BIRD_BGP_H_
  10 #define _BIRD_BGP_H_
  11
  12 struct bgp_config {
  13   struct proto_config c;
  14   unsigned int local_as, remote_as;
  15   ip_addr remote_ip;
  16   int multihop;                         /* Number of hops if multihop */
  17   unsigned connect_retry_time;
  18   unsigned hold_time, initial_hold_time;
  19   unsigned keepalive_time;
  20 };
  21
  22 struct bgp_conn {
  23   struct bgp_proto *bgp;
  24   struct birdsock *sk;
  25   unsigned int state;                   /* State of connection state machine */
  26   struct timer *connect_retry_timer;
  27   struct timer *hold_timer;
  28   struct timer *keepalive_timer;
  29   int packets_to_send;                  /* Bitmap of packet types to be sent */
  30   int notify_code, notify_subcode, notify_arg, notify_arg_size;
  31   int error_flag;                       /* Error state, ignore all input */
  32   unsigned hold_time, keepalive_time;   /* Times calculated from my and neighbor's requirements */
  33 };
  34
  35 struct bgp_proto {
  36   struct proto p;
  37   struct bgp_config *cf;                /* Shortcut to BGP configuration */
  38   node bgp_node;                        /* Node in global BGP protocol list */
  39   unsigned local_as, remote_as;
  40   int is_internal;                      /* Internal BGP connection (local_as == remote_as) */
  41   u32 local_id;                         /* BGP identifier of this router */
  42   u32 remote_id;                        /* BGP identifier of the neighbor */
  43   struct bgp_conn conn;                 /* Our primary connection */
  44   struct bgp_conn incoming_conn;        /* Incoming connection we have neither accepted nor rejected yet */
  45   struct object_lock *lock;             /* Lock for neighbor connection */
  46 };
  47
  48 #define BGP_PORT                179
  49 #define BGP_VERSION             4
  50 #define BGP_HEADER_LENGTH       19
  51 #define BGP_MAX_PACKET_LENGTH   4096
  52 #define BGP_RX_BUFFER_SIZE      4096
  53 #define BGP_TX_BUFFER_SIZE      BGP_MAX_PACKET_LENGTH
  54
  55 void bgp_start_timer(struct timer *t, int value);
  56 void bgp_check(struct bgp_config *c);
  57 void bgp_error(struct bgp_conn *c, unsigned code, unsigned subcode, unsigned data, unsigned len);
  58 void bgp_close_conn(struct bgp_conn *conn);
  59
  60 /* attrs.c */
  61
  62 /* packets.c */
  63
  64 void bgp_schedule_packet(struct bgp_conn *conn, int type);
  65 void bgp_tx(struct birdsock *sk);
  66 int bgp_rx(struct birdsock *sk, int size);
  67
  68 /* Packet types */
  69
  70 #define PKT_OPEN                0x01
  71 #define PKT_UPDATE              0x02
  72 #define PKT_NOTIFICATION        0x03
  73 #define PKT_KEEPALIVE           0x04
  74 #define PKT_SCHEDULE_CLOSE      0x1f    /* Used internally to schedule socket close */
  75
  76 /* Attributes */
  77
  78 #define BAF_OPTIONAL            0x80
  79 #define BAF_TRANSITIVE          0x40
  80 #define BAF_PARTIAL             0x20
  81 #define BAF_EXT_LEN             0x10
  82
  83 #define BA_ORIGIN               0x01    /* [RFC1771] */         /* WM */
  84 #define BA_AS_PATH              0x02                            /* WM */
  85 #define BA_NEXT_HOP             0x03                            /* WM */
  86 #define BA_MULTI_EXIT_DISC      0x04                            /* ON */
  87 #define BA_LOCAL_PREF           0x05                            /* WM */
  88 #define BA_ATOMIC_AGGR          0x06                            /* WD */
  89 #define BA_AGGREGATOR           0x07                            /* OT */
  90 #define BA_COMMUNITY            0x08    /* [RFC1997] */         /* OT */
  91 #define BA_ORIGINATOR_ID        0x09    /* [RFC1966] */         /* ON */
  92 #define BA_CLUSTER_LIST         0x0a                            /* ON */
  93 /* We don't support these: */
  94 #define BA_DPA                  0x0b    /* ??? */
  95 #define BA_ADVERTISER           0x0c    /* [RFC1863] */
  96 #define BA_RCID_PATH            0x0d
  97 #define BA_MP_REACH_NLRI        0x0e    /* [RFC2283] */
  98 #define BA_MP_UNREACH_NLRI      0x0f
  99 #define BA_EXTENDED_COMM        0x10    /* draft-ramachandra-bgp-ext-communities */
 100
 101 /* BGP states */
 102
 103 #define BS_IDLE                 0
 104 #define BS_CONNECT              1       /* Attempting to connect */
 105 #define BS_ACTIVE               2       /* Waiting for connection retry & listening */
 106 #define BS_OPENSENT             3
 107 #define BS_OPENCONFIRM          4
 108 #define BS_ESTABLISHED          5
 109
 110 #endif