2 /* $Id: bgp.h,v 1.4 2004-12-16 08:49:52 bodea Exp $ */
7 #define BGP_MAX_PACKET_SIZE 4096
8 #define BGP_HOLD_TIME 180 /* seconds before peer times us out */
9 #define BGP_KEEPALIVE_TIME 60 /* seconds between messages */
10 #define BGP_STATE_TIME 60 /* state transition timeout in seconds */
11 #define BGP_MAX_RETRY 42 /* maximum number of times to retry */
12 #define BGP_RETRY_BACKOFF 60 /* number of seconds between retries,
15 #define BGP_METRIC 1 /* multi_exit_disc */
16 #define BGP_LOCAL_PREF 100 /* local preference value */
22 } __attribute__ ((packed
));
25 #define BGP_MSG_OPEN 1
26 #define BGP_MSG_UPDATE 2
27 #define BGP_MSG_NOTIFICATION 3
28 #define BGP_MSG_KEEPALIVE 4
31 struct bgp_header header
;
32 char data
[BGP_MAX_PACKET_SIZE
- sizeof(struct bgp_header
)]; /* variable */
33 } __attribute__ ((packed
));
35 struct bgp_data_open
{
42 #define BGP_DATA_OPEN_SIZE 10 /* size of struct excluding opt_params */
43 char opt_params
[sizeof(((struct bgp_packet
*)0)->data
) - BGP_DATA_OPEN_SIZE
]; /* variable */
44 } __attribute__ ((packed
));
46 struct bgp_ip_prefix
{
48 uint32_t prefix
; /* variable */
49 } __attribute__ ((packed
));
51 #define BGP_IP_PREFIX_SIZE(p) (1 + ((p).len / 8) + ((p).len % 8 != 0))
53 struct bgp_path_attr
{
59 char value
[29]; /* semi-random size, adequate for l2tpns */
60 } __attribute__ ((packed
)) s
; /* short */
64 } __attribute__ ((packed
)) e
; /* extended */
65 } data
; /* variable */
66 } __attribute__ ((packed
));
68 /* bgp_path_attr.flags (bitfields) */
69 #define BGP_PATH_ATTR_FLAG_OPTIONAL (1 << 7)
70 #define BGP_PATH_ATTR_FLAG_TRANS (1 << 6)
71 #define BGP_PATH_ATTR_FLAG_PARTIAL (1 << 5)
72 #define BGP_PATH_ATTR_FLAG_EXTLEN (1 << 4)
74 /* bgp_path_attr.code, ...value */
75 #define BGP_PATH_ATTR_CODE_ORIGIN 1 /* well-known, mandatory */
76 # define BGP_PATH_ATTR_CODE_ORIGIN_IGP 0
77 # define BGP_PATH_ATTR_CODE_ORIGIN_EGP 1
78 # define BGP_PATH_ATTR_CODE_ORIGIN_INCOMPLETE 2
79 #define BGP_PATH_ATTR_CODE_AS_PATH 2 /* well-known, mandatory */
80 # define BGP_PATH_ATTR_CODE_AS_PATH_AS_SET 1
81 # define BGP_PATH_ATTR_CODE_AS_PATH_AS_SEQUENCE 2
82 #define BGP_PATH_ATTR_CODE_NEXT_HOP 3 /* well-known, mandatory */
83 #define BGP_PATH_ATTR_CODE_MULTI_EXIT_DISC 4 /* optional, non-transitive */
84 #define BGP_PATH_ATTR_CODE_LOCAL_PREF 5 /* well-known, discretionary */
85 #define BGP_PATH_ATTR_CODE_ATOMIC_AGGREGATE 6 /* well-known, discretionary */
86 #define BGP_PATH_ATTR_CODE_AGGREGATOR 7 /* optional, transitive */
87 #define BGP_PATH_ATTR_CODE_COMMUNITIES 8 /* optional, transitive (RFC1997) */
89 #define BGP_PATH_ATTR_SIZE(p) ((((p).flags & BGP_PATH_ATTR_FLAG_EXTLEN) \
90 ? ((p).data.e.len + 1) : (p).data.s.len) + 3)
92 /* well known COMMUNITIES */
93 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01 /* don't advertise outside confederation */
94 #define BGP_COMMUNITY_NO_ADVERTISE 0xffffff02 /* don't advertise to any peer */
95 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03 /* don't advertise to any other AS */
97 struct bgp_data_notification
{
99 uint8_t error_subcode
;
100 char data
[sizeof(((struct bgp_packet
*)0)->data
) - 2]; /* variable */
101 } __attribute__ ((packed
));
103 /* bgp_data_notification.error_code, .error_subcode */
104 #define BGP_ERR_HEADER 1
105 # define BGP_ERR_HDR_NOT_SYNC 1
106 # define BGP_ERR_HDR_BAD_LEN 2
107 # define BGP_ERR_HDR_BAD_TYPE 3
108 #define BGP_ERR_OPEN 2
109 # define BGP_ERR_OPN_VERSION 1
110 # define BGP_ERR_OPN_BAD_AS 2
111 # define BGP_ERR_OPN_BAD_IDENT 3
112 # define BGP_ERR_OPN_UNSUP_PARAM 4
113 # define BGP_ERR_OPN_AUTH_FAILURE 5
114 # define BGP_ERR_OPN_HOLD_TIME 6
115 #define BGP_ERR_UPDATE 3
116 # define BGP_ERR_UPD_BAD_ATTR_LIST 1
117 # define BGP_ERR_UPD_UNKN_WK_ATTR 2
118 # define BGP_ERR_UPD_MISS_WK_ATTR 3
119 # define BGP_ERR_UPD_BAD_ATTR_FLAG 4
120 # define BGP_ERR_UPD_BAD_ATTR_LEN 5
121 # define BGP_ERR_UPD_BAD_ORIGIN 6
122 # define BGP_ERR_UPD_ROUTING_LOOP 7
123 # define BGP_ERR_UPD_BAD_NEXT_HOP 8
124 # define BGP_ERR_UPD_BAD_OPT_ATTR 9
125 # define BGP_ERR_UPD_BAD_NETWORK 10
126 # define BGP_ERR_UPD_BAD_AS_PATH 11
127 #define BGP_ERR_HOLD_TIMER_EXP 4
128 #define BGP_ERR_FSM 5
129 #define BGP_ERR_CEASE 6
132 Disabled
, /* initial, or failed */
133 Idle
, /* trying to connect */
134 Connect
, /* connect issued */
135 Active
, /* connected, waiting to send OPEN */
136 OpenSent
, /* OPEN sent, waiting for peer OPEN */
137 OpenConfirm
, /* KEEPALIVE sent, waiting for peer KEEPALIVE */
138 Established
, /* established */
141 struct bgp_route_list
{
142 struct bgp_ip_prefix dest
;
143 struct bgp_route_list
*next
;
147 struct bgp_packet packet
; /* BGP packet */
148 size_t done
; /* bytes sent/recvd */
153 char name
[32]; /* peer name */
154 in_addr_t addr
; /* peer address */
155 int as
; /* AS number */
157 enum bgp_state state
; /* FSM state */
158 enum bgp_state next_state
; /* next state after outbuf cleared */
159 time_t state_time
; /* time of last state change */
160 time_t keepalive_time
; /* time to send next keepalive */
161 time_t retry_time
; /* time for connection retry */
162 int retry_count
; /* connection retry count */
163 int init_keepalive
; /* initial keepalive time */
164 int init_hold
; /* initial hold time */
165 int keepalive
; /* negotiated keepalive time */
166 int hold
; /* negotiated hold time */
167 time_t expire_time
; /* time next peer packet expected */
168 int routing
; /* propagate routes */
169 int update_routes
; /* UPDATE required */
170 struct bgp_route_list
*routes
; /* routes known by this peer */
171 struct bgp_buf
*outbuf
; /* pending output */
172 struct bgp_buf
*inbuf
; /* pending input */
173 int cli_flag
; /* updates requested from CLI */
174 char *path_attrs
; /* path attrs to send in UPDATE message */
175 int path_attr_len
; /* length of path attrs */
178 /* bgp_peer.cli_flag */
179 #define BGP_CLI_SUSPEND 1
180 #define BGP_CLI_ENABLE 2
181 #define BGP_CLI_RESTART 3
183 extern struct bgp_peer
*bgp_peers
;
184 extern int bgp_configured
;
187 int bgp_setup(int as
);
188 int bgp_start(struct bgp_peer
*peer
, char *name
, int as
, int keepalive
,
189 int hold
, int enable
);
191 void bgp_stop(struct bgp_peer
*peer
);
192 void bgp_halt(struct bgp_peer
*peer
);
193 int bgp_restart(struct bgp_peer
*peer
);
194 int bgp_add_route(in_addr_t ip
, in_addr_t mask
);
195 int bgp_del_route(in_addr_t ip
, in_addr_t mask
);
196 void bgp_enable_routing(int enable
);
197 int bgp_select_state(struct bgp_peer
*peer
);
198 int bgp_process(struct bgp_peer
*peer
, int readable
, int writable
);
199 char const *bgp_state_str(enum bgp_state state
);
201 extern char const *cvs_id_bgp
;
203 #endif /* __BGP_H__ */