b36141c0c7
When adding a BGP neighbour, one can set "update-source" (quagga syntax) to the source IP address that will be used for that session. Signed-off-by: Benjamin Cama <benoar@dolka.fr>
206 lines
7 KiB
C
206 lines
7 KiB
C
/* BGPv4 (RFC1771) */
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/* $Id: bgp.h,v 1.5 2005/06/04 15:42:35 bodea Exp $ */
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#ifndef __BGP_H__
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#define __BGP_H__
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#define BGP_MAX_PACKET_SIZE 4096
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#define BGP_HOLD_TIME 180 /* seconds before peer times us out */
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#define BGP_KEEPALIVE_TIME 60 /* seconds between messages */
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#define BGP_STATE_TIME 60 /* state transition timeout in seconds */
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#define BGP_MAX_RETRY 42 /* maximum number of times to retry */
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#define BGP_RETRY_BACKOFF 60 /* number of seconds between retries,
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cumulative */
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#define BGP_METRIC 1 /* multi_exit_disc */
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#define BGP_LOCAL_PREF 100 /* local preference value */
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struct bgp_header {
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char marker[16];
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uint16_t len;
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uint8_t type;
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} __attribute__ ((packed));
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/* bgp_header.type */
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#define BGP_MSG_OPEN 1
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#define BGP_MSG_UPDATE 2
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#define BGP_MSG_NOTIFICATION 3
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#define BGP_MSG_KEEPALIVE 4
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struct bgp_packet {
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struct bgp_header header;
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char data[BGP_MAX_PACKET_SIZE - sizeof(struct bgp_header)]; /* variable */
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} __attribute__ ((packed));
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struct bgp_data_open {
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uint8_t version;
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#define BGP_VERSION 4
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uint16_t as;
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uint16_t hold_time;
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uint32_t identifier;
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uint8_t opt_len;
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#define BGP_DATA_OPEN_SIZE 10 /* size of struct excluding opt_params */
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char opt_params[sizeof(((struct bgp_packet *)0)->data) - BGP_DATA_OPEN_SIZE]; /* variable */
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} __attribute__ ((packed));
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struct bgp_ip_prefix {
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uint8_t len;
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uint32_t prefix; /* variable */
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} __attribute__ ((packed));
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#define BGP_IP_PREFIX_SIZE(p) (1 + ((p).len / 8) + ((p).len % 8 != 0))
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struct bgp_path_attr {
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uint8_t flags;
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uint8_t code;
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union {
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struct {
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uint8_t len;
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char value[29]; /* semi-random size, adequate for l2tpns */
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} __attribute__ ((packed)) s; /* short */
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struct {
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uint16_t len;
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char value[28];
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} __attribute__ ((packed)) e; /* extended */
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} data; /* variable */
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} __attribute__ ((packed));
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/* bgp_path_attr.flags (bitfields) */
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#define BGP_PATH_ATTR_FLAG_OPTIONAL (1 << 7)
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#define BGP_PATH_ATTR_FLAG_TRANS (1 << 6)
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#define BGP_PATH_ATTR_FLAG_PARTIAL (1 << 5)
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#define BGP_PATH_ATTR_FLAG_EXTLEN (1 << 4)
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/* bgp_path_attr.code, ...value */
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#define BGP_PATH_ATTR_CODE_ORIGIN 1 /* well-known, mandatory */
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# define BGP_PATH_ATTR_CODE_ORIGIN_IGP 0
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# define BGP_PATH_ATTR_CODE_ORIGIN_EGP 1
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# define BGP_PATH_ATTR_CODE_ORIGIN_INCOMPLETE 2
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#define BGP_PATH_ATTR_CODE_AS_PATH 2 /* well-known, mandatory */
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# define BGP_PATH_ATTR_CODE_AS_PATH_AS_SET 1
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# define BGP_PATH_ATTR_CODE_AS_PATH_AS_SEQUENCE 2
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#define BGP_PATH_ATTR_CODE_NEXT_HOP 3 /* well-known, mandatory */
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#define BGP_PATH_ATTR_CODE_MULTI_EXIT_DISC 4 /* optional, non-transitive */
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#define BGP_PATH_ATTR_CODE_LOCAL_PREF 5 /* well-known, discretionary */
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#define BGP_PATH_ATTR_CODE_ATOMIC_AGGREGATE 6 /* well-known, discretionary */
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#define BGP_PATH_ATTR_CODE_AGGREGATOR 7 /* optional, transitive */
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#define BGP_PATH_ATTR_CODE_COMMUNITIES 8 /* optional, transitive (RFC1997) */
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#define BGP_PATH_ATTR_SIZE(p) ((((p).flags & BGP_PATH_ATTR_FLAG_EXTLEN) \
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? ((p).data.e.len + 1) : (p).data.s.len) + 3)
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/* well known COMMUNITIES */
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#define BGP_COMMUNITY_NO_EXPORT 0xffffff01 /* don't advertise outside confederation */
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#define BGP_COMMUNITY_NO_ADVERTISE 0xffffff02 /* don't advertise to any peer */
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#define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03 /* don't advertise to any other AS */
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struct bgp_data_notification {
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uint8_t error_code;
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uint8_t error_subcode;
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char data[sizeof(((struct bgp_packet *)0)->data) - 2]; /* variable */
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} __attribute__ ((packed));
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/* bgp_data_notification.error_code, .error_subcode */
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#define BGP_ERR_HEADER 1
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# define BGP_ERR_HDR_NOT_SYNC 1
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# define BGP_ERR_HDR_BAD_LEN 2
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# define BGP_ERR_HDR_BAD_TYPE 3
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#define BGP_ERR_OPEN 2
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# define BGP_ERR_OPN_VERSION 1
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# define BGP_ERR_OPN_BAD_AS 2
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# define BGP_ERR_OPN_BAD_IDENT 3
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# define BGP_ERR_OPN_UNSUP_PARAM 4
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# define BGP_ERR_OPN_AUTH_FAILURE 5
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# define BGP_ERR_OPN_HOLD_TIME 6
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#define BGP_ERR_UPDATE 3
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# define BGP_ERR_UPD_BAD_ATTR_LIST 1
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# define BGP_ERR_UPD_UNKN_WK_ATTR 2
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# define BGP_ERR_UPD_MISS_WK_ATTR 3
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# define BGP_ERR_UPD_BAD_ATTR_FLAG 4
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# define BGP_ERR_UPD_BAD_ATTR_LEN 5
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# define BGP_ERR_UPD_BAD_ORIGIN 6
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# define BGP_ERR_UPD_ROUTING_LOOP 7
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# define BGP_ERR_UPD_BAD_NEXT_HOP 8
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# define BGP_ERR_UPD_BAD_OPT_ATTR 9
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# define BGP_ERR_UPD_BAD_NETWORK 10
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# define BGP_ERR_UPD_BAD_AS_PATH 11
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#define BGP_ERR_HOLD_TIMER_EXP 4
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#define BGP_ERR_FSM 5
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#define BGP_ERR_CEASE 6
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enum bgp_state {
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Disabled, /* initial, or failed */
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Idle, /* trying to connect */
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Connect, /* connect issued */
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Active, /* connected, waiting to send OPEN */
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OpenSent, /* OPEN sent, waiting for peer OPEN */
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OpenConfirm, /* KEEPALIVE sent, waiting for peer KEEPALIVE */
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Established, /* established */
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};
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struct bgp_route_list {
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struct bgp_ip_prefix dest;
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struct bgp_route_list *next;
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};
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struct bgp_buf {
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struct bgp_packet packet; /* BGP packet */
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size_t done; /* bytes sent/recvd */
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};
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/* state */
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struct bgp_peer {
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char name[32]; /* peer name */
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in_addr_t addr; /* peer address */
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in_addr_t source_addr; /* our source address */
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int as; /* AS number */
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int sock;
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enum bgp_state state; /* FSM state */
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enum bgp_state next_state; /* next state after outbuf cleared */
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time_t state_time; /* time of last state change */
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time_t keepalive_time; /* time to send next keepalive */
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time_t retry_time; /* time for connection retry */
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int retry_count; /* connection retry count */
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int init_keepalive; /* initial keepalive time */
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int init_hold; /* initial hold time */
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int keepalive; /* negotiated keepalive time */
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int hold; /* negotiated hold time */
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time_t expire_time; /* time next peer packet expected */
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int routing; /* propagate routes */
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int update_routes; /* UPDATE required */
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struct bgp_route_list *routes; /* routes known by this peer */
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struct bgp_buf *outbuf; /* pending output */
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struct bgp_buf *inbuf; /* pending input */
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int cli_flag; /* updates requested from CLI */
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char *path_attrs; /* path attrs to send in UPDATE message */
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int path_attr_len; /* length of path attrs */
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uint32_t events; /* events to poll */
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struct event_data edata; /* poll data */
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};
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/* bgp_peer.cli_flag */
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#define BGP_CLI_SUSPEND 1
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#define BGP_CLI_ENABLE 2
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#define BGP_CLI_RESTART 3
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extern struct bgp_peer *bgp_peers;
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extern int bgp_configured;
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/* actions */
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int bgp_setup(int as);
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int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive,
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int hold, struct in_addr update_source, int enable);
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void bgp_stop(struct bgp_peer *peer);
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void bgp_halt(struct bgp_peer *peer);
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int bgp_restart(struct bgp_peer *peer);
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int bgp_add_route(in_addr_t ip, in_addr_t mask);
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int bgp_del_route(in_addr_t ip, in_addr_t mask);
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void bgp_enable_routing(int enable);
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int bgp_set_poll(void);
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int bgp_process(uint32_t events[]);
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char const *bgp_state_str(enum bgp_state state);
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extern char const *cvs_id_bgp;
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#endif /* __BGP_H__ */
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