132 lines
4.5 KiB
C
132 lines
4.5 KiB
C
/*
|
|
* BIRD -- The Border Gateway Protocol
|
|
*
|
|
* (c) 2000 Martin Mares <mj@ucw.cz>
|
|
*
|
|
* Can be freely distributed and used under the terms of the GNU GPL.
|
|
*/
|
|
|
|
#ifndef _BIRD_BGP_H_
|
|
#define _BIRD_BGP_H_
|
|
|
|
struct linpool;
|
|
struct eattr;
|
|
|
|
struct bgp_config {
|
|
struct proto_config c;
|
|
unsigned int local_as, remote_as;
|
|
ip_addr remote_ip;
|
|
int multihop; /* Number of hops if multihop */
|
|
ip_addr multihop_via; /* Multihop: address to route to */
|
|
int next_hop_self; /* Always set next hop to local IP address */
|
|
unsigned connect_retry_time;
|
|
unsigned hold_time, initial_hold_time;
|
|
unsigned keepalive_time;
|
|
};
|
|
|
|
struct bgp_conn {
|
|
struct bgp_proto *bgp;
|
|
struct birdsock *sk;
|
|
unsigned int state; /* State of connection state machine */
|
|
struct timer *connect_retry_timer;
|
|
struct timer *hold_timer;
|
|
struct timer *keepalive_timer;
|
|
int packets_to_send; /* Bitmap of packet types to be sent */
|
|
int notify_code, notify_subcode, notify_arg, notify_arg_size;
|
|
int error_flag; /* Error state, ignore all input */
|
|
int primary; /* This connection is primary */
|
|
unsigned hold_time, keepalive_time; /* Times calculated from my and neighbor's requirements */
|
|
};
|
|
|
|
struct bgp_proto {
|
|
struct proto p;
|
|
struct bgp_config *cf; /* Shortcut to BGP configuration */
|
|
node bgp_node; /* Node in global BGP protocol list */
|
|
unsigned local_as, remote_as;
|
|
int is_internal; /* Internal BGP connection (local_as == remote_as) */
|
|
u32 local_id; /* BGP identifier of this router */
|
|
u32 remote_id; /* BGP identifier of the neighbor */
|
|
struct bgp_conn *conn; /* Connection we have established */
|
|
struct bgp_conn outgoing_conn; /* Outgoing connection we're working with */
|
|
struct bgp_conn incoming_conn; /* Incoming connection we have neither accepted nor rejected yet */
|
|
struct object_lock *lock; /* Lock for neighbor connection */
|
|
ip_addr next_hop; /* Either the peer or multihop_via */
|
|
struct neighbor *neigh; /* Neighbor entry corresponding to next_hop */
|
|
ip_addr local_addr; /* Address of the local end of the link to next_hop */
|
|
};
|
|
|
|
#define BGP_PORT 179
|
|
#define BGP_VERSION 4
|
|
#define BGP_HEADER_LENGTH 19
|
|
#define BGP_MAX_PACKET_LENGTH 4096
|
|
#define BGP_RX_BUFFER_SIZE 4096
|
|
#define BGP_TX_BUFFER_SIZE BGP_MAX_PACKET_LENGTH
|
|
|
|
extern struct linpool *bgp_linpool;
|
|
|
|
void bgp_start_timer(struct timer *t, int value);
|
|
void bgp_check(struct bgp_config *c);
|
|
void bgp_error(struct bgp_conn *c, unsigned code, unsigned subcode, unsigned data, unsigned len);
|
|
void bgp_close_conn(struct bgp_conn *c);
|
|
|
|
/* attrs.c */
|
|
|
|
struct rta *bgp_decode_attrs(struct bgp_conn *conn, byte *a, unsigned int len, struct linpool *pool);
|
|
int bgp_get_attr(struct eattr *e, byte *buf);
|
|
int bgp_rte_better(struct rte *, struct rte *);
|
|
void bgp_rt_notify(struct proto *, struct network *, struct rte *, struct rte *, struct ea_list *);
|
|
int bgp_import_control(struct proto *, struct rte **, struct ea_list **, struct linpool *);
|
|
struct ea_list *bgp_path_prepend(struct linpool *pool, struct eattr *a, struct ea_list *old, int as);
|
|
|
|
/* packets.c */
|
|
|
|
void bgp_schedule_packet(struct bgp_conn *conn, int type);
|
|
void bgp_tx(struct birdsock *sk);
|
|
int bgp_rx(struct birdsock *sk, int size);
|
|
|
|
/* Packet types */
|
|
|
|
#define PKT_OPEN 0x01
|
|
#define PKT_UPDATE 0x02
|
|
#define PKT_NOTIFICATION 0x03
|
|
#define PKT_KEEPALIVE 0x04
|
|
#define PKT_SCHEDULE_CLOSE 0x1f /* Used internally to schedule socket close */
|
|
|
|
/* Attributes */
|
|
|
|
#define BAF_OPTIONAL 0x80
|
|
#define BAF_TRANSITIVE 0x40
|
|
#define BAF_PARTIAL 0x20
|
|
#define BAF_EXT_LEN 0x10
|
|
|
|
#define BA_ORIGIN 0x01 /* [RFC1771] */ /* WM */
|
|
#define BA_AS_PATH 0x02 /* WM */
|
|
#define BA_NEXT_HOP 0x03 /* WM */
|
|
#define BA_MULTI_EXIT_DISC 0x04 /* ON */
|
|
#define BA_LOCAL_PREF 0x05 /* WD */
|
|
#define BA_ATOMIC_AGGR 0x06 /* WD */
|
|
#define BA_AGGREGATOR 0x07 /* OT */
|
|
#define BA_COMMUNITY 0x08 /* [RFC1997] */ /* OT */
|
|
#define BA_ORIGINATOR_ID 0x09 /* [RFC1966] */ /* ON */
|
|
#define BA_CLUSTER_LIST 0x0a /* ON */
|
|
/* We don't support these: */
|
|
#define BA_DPA 0x0b /* ??? */
|
|
#define BA_ADVERTISER 0x0c /* [RFC1863] */
|
|
#define BA_RCID_PATH 0x0d
|
|
#define BA_MP_REACH_NLRI 0x0e /* [RFC2283] */
|
|
#define BA_MP_UNREACH_NLRI 0x0f
|
|
#define BA_EXTENDED_COMM 0x10 /* draft-ramachandra-bgp-ext-communities */
|
|
|
|
#define BGP_PATH_AS_SET 1 /* Types of path segments */
|
|
#define BGP_PATH_AS_SEQUENCE 2
|
|
|
|
/* BGP states */
|
|
|
|
#define BS_IDLE 0
|
|
#define BS_CONNECT 1 /* Attempting to connect */
|
|
#define BS_ACTIVE 2 /* Waiting for connection retry & listening */
|
|
#define BS_OPENSENT 3
|
|
#define BS_OPENCONFIRM 4
|
|
#define BS_ESTABLISHED 5
|
|
|
|
#endif
|