--- /dev/null
+/* BGPv4 (RFC1771) */
+/* $Id: bgp.h,v 1.1 2004-06-23 03:52:24 fred_nerk Exp $ */
+
+#ifndef __BGP_H__
+#define __BGP_H__
+
+#define BGP_MAX_PACKET_SIZE 4096
+#define BGP_HOLD_TIME 180 /* seconds before peer times us out */
+#define BGP_KEEPALIVE_TIME 60 /* seconds between messages */
+#define BGP_MAX_RETRY 42 /* maximum number of times to retry */
+#define BGP_RETRY_BACKOFF 60 /* number of seconds between retries,
+ cumulative */
+
+#define BGP_METRIC 1 /* multi_exit_disc */
+#define BGP_LOCAL_PREF 100 /* local preference value */
+
+struct bgp_header {
+ char marker[16];
+ u16 len;
+ u8 type;
+} __attribute__ ((packed));
+
+/* bgp_header.type */
+#define BGP_MSG_OPEN 1
+#define BGP_MSG_UPDATE 2
+#define BGP_MSG_NOTIFICATION 3
+#define BGP_MSG_KEEPALIVE 4
+
+struct bgp_packet {
+ struct bgp_header header;
+ char data[BGP_MAX_PACKET_SIZE - sizeof(struct bgp_header)]; /* variable */
+} __attribute__ ((packed));
+
+struct bgp_data_open {
+ u8 version;
+#define BGP_VERSION 4
+ u16 as;
+ u16 hold_time;
+ u32 identifier;
+ u8 opt_len;
+#define BGP_DATA_OPEN_SIZE 10 /* size of struct excluding opt_params */
+ char opt_params[sizeof(((struct bgp_packet *)0)->data) - BGP_DATA_OPEN_SIZE]; /* variable */
+} __attribute__ ((packed));
+
+struct bgp_ip_prefix {
+ u8 len;
+ u32 prefix; /* variable */
+} __attribute__ ((packed));
+
+#define BGP_IP_PREFIX_SIZE(p) (1 + ((p).len / 8) + ((p).len % 8 != 0))
+
+struct bgp_path_attr {
+ u8 flags;
+ u8 code;
+ union {
+ struct {
+ u8 len;
+ char value[29]; /* semi-random size, adequate for l2tpns */
+ } __attribute__ ((packed)) s; /* short */
+ struct {
+ u16 len;
+ char value[28];
+ } __attribute__ ((packed)) e; /* extended */
+ } data; /* variable */
+} __attribute__ ((packed));
+
+/* bgp_path_attr.flags (bitfields) */
+#define BGP_PATH_ATTR_FLAG_OPTIONAL (1 << 7)
+#define BGP_PATH_ATTR_FLAG_TRANS (1 << 6)
+#define BGP_PATH_ATTR_FLAG_PARTIAL (1 << 5)
+#define BGP_PATH_ATTR_FLAG_EXTLEN (1 << 4)
+
+/* bgp_path_attr.code, ...value */
+#define BGP_PATH_ATTR_CODE_ORIGIN 1 /* well-known, mandatory */
+# define BGP_PATH_ATTR_CODE_ORIGIN_IGP 0
+# define BGP_PATH_ATTR_CODE_ORIGIN_EGP 1
+# define BGP_PATH_ATTR_CODE_ORIGIN_INCOMPLETE 2
+#define BGP_PATH_ATTR_CODE_AS_PATH 2 /* well-known, mandatory */
+# define BGP_PATH_ATTR_CODE_AS_PATH_AS_SET 1
+# define BGP_PATH_ATTR_CODE_AS_PATH_AS_SEQUENCE 2
+#define BGP_PATH_ATTR_CODE_NEXT_HOP 3 /* well-known, mandatory */
+#define BGP_PATH_ATTR_CODE_MULTI_EXIT_DISC 4 /* optional, non-transitive */
+#define BGP_PATH_ATTR_CODE_LOCAL_PREF 5 /* well-known, discretionary */
+#define BGP_PATH_ATTR_CODE_ATOMIC_AGGREGATE 6 /* well-known, discretionary */
+#define BGP_PATH_ATTR_CODE_AGGREGATOR 7 /* optional, transitive */
+#define BGP_PATH_ATTR_CODE_COMMUNITIES 8 /* optional, transitive (RFC1997) */
+
+#define BGP_PATH_ATTR_SIZE(p) ((((p).flags & BGP_PATH_ATTR_FLAG_EXTLEN) \
+ ? ((p).data.e.len + 1) : (p).data.s.len) + 3)
+
+/* well known COMMUNITIES */
+#define BGP_COMMUNITY_NO_EXPORT 0xffffff01 /* don't advertise outside confederation */
+#define BGP_COMMUNITY_NO_ADVERTISE 0xffffff02 /* don't advertise to any peer */
+#define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03 /* don't advertise to any other AS */
+
+struct bgp_data_notification {
+ u8 error_code;
+ u8 error_subcode;
+ char data[sizeof(((struct bgp_packet *)0)->data) - 2]; /* variable */
+} __attribute__ ((packed));
+
+/* bgp_data_notification.error_code, .error_subcode */
+#define BGP_ERR_HEADER 1
+# define BGP_ERR_HDR_NOT_SYNC 1
+# define BGP_ERR_HDR_BAD_LEN 2
+# define BGP_ERR_HDR_BAD_TYPE 3
+#define BGP_ERR_OPEN 2
+# define BGP_ERR_OPN_VERSION 1
+# define BGP_ERR_OPN_BAD_AS 2
+# define BGP_ERR_OPN_BAD_IDENT 3
+# define BGP_ERR_OPN_UNSUP_PARAM 4
+# define BGP_ERR_OPN_AUTH_FAILURE 5
+# define BGP_ERR_OPN_HOLD_TIME 6
+#define BGP_ERR_UPDATE 3
+# define BGP_ERR_UPD_BAD_ATTR_LIST 1
+# define BGP_ERR_UPD_UNKN_WK_ATTR 2
+# define BGP_ERR_UPD_MISS_WK_ATTR 3
+# define BGP_ERR_UPD_BAD_ATTR_FLAG 4
+# define BGP_ERR_UPD_BAD_ATTR_LEN 5
+# define BGP_ERR_UPD_BAD_ORIGIN 6
+# define BGP_ERR_UPD_ROUTING_LOOP 7
+# define BGP_ERR_UPD_BAD_NEXT_HOP 8
+# define BGP_ERR_UPD_BAD_OPT_ATTR 9
+# define BGP_ERR_UPD_BAD_NETWORK 10
+# define BGP_ERR_UPD_BAD_AS_PATH 11
+#define BGP_ERR_HOLD_TIMER_EXP 4
+#define BGP_ERR_FSM 5
+#define BGP_ERR_CEASE 6
+
+enum bgp_state {
+ Disabled, /* initial, or failed */
+ Idle, /* trying to connect */
+ Connect, /* connect issued */
+ Active, /* connected, waiting to send OPEN */
+ OpenSent, /* OPEN sent, waiting for peer OPEN */
+ OpenConfirm, /* KEEPALIVE sent, waiting for peer KEEPALIVE */
+ Established, /* established */
+};
+
+struct bgp_route_list {
+ struct bgp_ip_prefix dest;
+ struct bgp_route_list *next;
+};
+
+struct bgp_buf {
+ struct bgp_packet packet; /* BGP packet */
+ size_t done; /* bytes sent/recvd */
+};
+
+/* state */
+struct bgp_peer {
+ char name[32]; /* peer name */
+ in_addr_t addr; /* peer address */
+ int as; /* AS number */
+ int sock;
+ enum bgp_state state; /* FSM state */
+ enum bgp_state next_state; /* next state after outbuf cleared */
+ time_t state_time; /* time of last state change */
+ time_t keepalive_time; /* time to send next keepalive */
+ time_t retry_time; /* time for connection retry */
+ int retry_count; /* connection retry count */
+ int hold; /* hold time from peer */
+ time_t expire_time; /* time next peer packet expected */
+ int routing; /* propagate routes */
+ int update_routes; /* UPDATE required */
+ struct bgp_route_list *routes; /* routes known by this peer */
+ struct bgp_buf *outbuf; /* pending output */
+ struct bgp_buf *inbuf; /* pending input */
+ int cli_flag; /* updates requested from CLI */
+ char *path_attrs; /* path attrs to send in UPDATE message */
+ int path_attr_len; /* length of path attrs */
+};
+
+/* bgp_peer.cli_flag */
+#define BGP_CLI_SUSPEND 1
+#define BGP_CLI_ENABLE 2
+#define BGP_CLI_RESTART 3
+
+#define BGP_NUM_PEERS 2
+extern struct bgp_peer *bgp_peers;
+extern struct bgp_route_list *bgp_routes;
+extern int bgp_configured;
+
+/* actions */
+int bgp_setup(int as);
+int bgp_start(struct bgp_peer *peer, char *name, int as, int enable);
+void bgp_stop(struct bgp_peer *peer);
+void bgp_halt(struct bgp_peer *peer);
+int bgp_restart(struct bgp_peer *peer);
+int bgp_add_route(in_addr_t ip, in_addr_t mask);
+int bgp_del_route(in_addr_t ip, in_addr_t mask);
+void bgp_enable_routing(int enable);
+int bgp_select_state(struct bgp_peer *peer);
+int bgp_process(struct bgp_peer *peer, int readable, int writable);
+
+/* CLI */
+int cmd_show_bgp(struct cli_def *cli, char *command, char **argv, int argc);
+int cmd_suspend_bgp(struct cli_def *cli, char *command, char **argv, int argc);
+int cmd_no_suspend_bgp(struct cli_def *cli, char *command, char **argv, int argc);
+int cmd_restart_bgp(struct cli_def *cli, char *command, char **argv, int argc);
+
+#endif /* __BGP_H__ */
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