]>
git.ipfire.org Git - thirdparty/bird.git/blob - proto/bgp/bgp.h
2 * BIRD -- The Border Gateway Protocol
4 * (c) 2000 Martin Mares <mj@ucw.cz>
5 * (c) 2008--2016 Ondrej Zajicek <santiago@crfreenet.org>
6 * (c) 2008--2016 CZ.NIC z.s.p.o.
8 * Can be freely distributed and used under the terms of the GNU GPL.
16 #include "nest/bird.h"
17 #include "nest/route.h"
19 //#include "lib/lists.h"
21 #include "lib/socket.h"
27 /* Address families */
29 #define BGP_AFI_IPV4 1
30 #define BGP_AFI_IPV6 2
32 #define BGP_SAFI_UNICAST 1
33 #define BGP_SAFI_MULTICAST 2
34 #define BGP_SAFI_MPLS 4
35 #define BGP_SAFI_MPLS_VPN 128
36 #define BGP_SAFI_VPN_MULTICAST 129
37 #define BGP_SAFI_FLOW 133
39 /* Internal AF codes */
41 #define BGP_AF(A, B) (((u32)(A) << 16) | (u32)(B))
42 #define BGP_AFI(A) ((u32)(A) >> 16)
43 #define BGP_SAFI(A) ((u32)(A) & 0xFFFF)
45 #define BGP_AF_IPV4 BGP_AF( BGP_AFI_IPV4, BGP_SAFI_UNICAST )
46 #define BGP_AF_IPV6 BGP_AF( BGP_AFI_IPV6, BGP_SAFI_UNICAST )
47 #define BGP_AF_IPV4_MC BGP_AF( BGP_AFI_IPV4, BGP_SAFI_MULTICAST )
48 #define BGP_AF_IPV6_MC BGP_AF( BGP_AFI_IPV6, BGP_SAFI_MULTICAST )
49 #define BGP_AF_IPV4_MPLS BGP_AF( BGP_AFI_IPV4, BGP_SAFI_MPLS )
50 #define BGP_AF_IPV6_MPLS BGP_AF( BGP_AFI_IPV6, BGP_SAFI_MPLS )
51 #define BGP_AF_VPN4_MPLS BGP_AF( BGP_AFI_IPV4, BGP_SAFI_MPLS_VPN )
52 #define BGP_AF_VPN6_MPLS BGP_AF( BGP_AFI_IPV6, BGP_SAFI_MPLS_VPN )
53 #define BGP_AF_VPN4_MC BGP_AF( BGP_AFI_IPV4, BGP_SAFI_VPN_MULTICAST )
54 #define BGP_AF_VPN6_MC BGP_AF( BGP_AFI_IPV6, BGP_SAFI_VPN_MULTICAST )
55 #define BGP_AF_FLOW4 BGP_AF( BGP_AFI_IPV4, BGP_SAFI_FLOW )
56 #define BGP_AF_FLOW6 BGP_AF( BGP_AFI_IPV6, BGP_SAFI_FLOW )
59 struct bgp_write_state
;
60 struct bgp_parse_state
;
61 struct bgp_export_state
;
70 uint (*encode_nlri
)(struct bgp_write_state
*s
, struct bgp_bucket
*buck
, byte
*buf
, uint size
);
71 void (*decode_nlri
)(struct bgp_parse_state
*s
, byte
*pos
, uint len
, rta
*a
);
72 void (*update_next_hop
)(struct bgp_export_state
*s
, eattr
*nh
, ea_list
**to
);
73 uint (*encode_next_hop
)(struct bgp_write_state
*s
, eattr
*nh
, byte
*buf
, uint size
);
74 void (*decode_next_hop
)(struct bgp_parse_state
*s
, byte
*pos
, uint len
, rta
*a
);
79 struct proto_config c
;
80 u32 local_as
, remote_as
;
81 ip_addr local_ip
; /* Source address to use */
83 struct iface
*iface
; /* Interface for link-local addresses */
84 u16 local_port
; /* Local listening port */
85 u16 remote_port
; /* Neighbor destination port */
86 int peer_type
; /* Internal or external BGP (BGP_PT_*, optional) */
87 int multihop
; /* Number of hops if multihop */
88 int strict_bind
; /* Bind listening socket to local address */
89 int ttl_security
; /* Enable TTL security [RFC 5082] */
90 int compare_path_lengths
; /* Use path lengths when selecting best route */
91 int med_metric
; /* Compare MULTI_EXIT_DISC even between routes from differen ASes */
92 int igp_metric
; /* Use IGP metrics when selecting best route */
93 int prefer_older
; /* Prefer older routes according to RFC 5004 */
94 int deterministic_med
; /* Use more complicated algo to have strict RFC 4271 MED comparison */
95 u32 default_local_pref
; /* Default value for LOCAL_PREF attribute */
96 u32 default_med
; /* Default value for MULTI_EXIT_DISC attribute */
97 int capabilities
; /* Enable capability handshake [RFC 5492] */
98 int enable_refresh
; /* Enable local support for route refresh [RFC 2918] */
99 int enable_as4
; /* Enable local support for 4B AS numbers [RFC 6793] */
100 int enable_extended_messages
; /* Enable local support for extended messages [draft] */
101 u32 rr_cluster_id
; /* Route reflector cluster ID, if different from local ID */
102 int rr_client
; /* Whether neighbor is RR client of me */
103 int rs_client
; /* Whether neighbor is RS client of me */
104 u32 confederation
; /* Confederation ID, or zero if confeds not active */
105 int confederation_member
; /* Whether neighbor AS is member of our confederation */
106 int passive
; /* Do not initiate outgoing connection */
107 int interpret_communities
; /* Hardwired handling of well-known communities */
108 int allow_local_as
; /* Allow that number of local ASNs in incoming AS_PATHs */
109 int allow_local_pref
; /* Allow LOCAL_PREF in EBGP sessions */
110 int gr_mode
; /* Graceful restart mode (BGP_GR_*) */
111 int llgr_mode
; /* Long-lived graceful restart mode (BGP_LLGR_*) */
112 int setkey
; /* Set MD5 password to system SA/SP database */
113 /* Times below are in seconds */
114 unsigned gr_time
; /* Graceful restart timeout */
115 unsigned llgr_time
; /* Long-lived graceful restart stale time */
116 unsigned connect_delay_time
; /* Minimum delay between connect attempts */
117 unsigned connect_retry_time
; /* Timeout for connect attempts */
118 unsigned hold_time
, initial_hold_time
;
119 unsigned keepalive_time
;
120 unsigned error_amnesia_time
; /* Errors are forgotten after */
121 unsigned error_delay_time_min
; /* Time to wait after an error is detected */
122 unsigned error_delay_time_max
;
123 unsigned disable_after_error
; /* Disable the protocol when error is detected */
124 u32 disable_after_cease
; /* Disable it when cease is received, bitfield */
126 char *password
; /* Password used for MD5 authentication */
127 net_addr
*remote_range
; /* Allowed neighbor range for dynamic BGP */
128 char *dynamic_name
; /* Name pattern for dynamic BGP */
129 int dynamic_name_digits
; /* Minimum number of digits for dynamic names */
130 int check_link
; /* Use iface link state for liveness detection */
131 int bfd
; /* Use BFD for liveness detection */
134 struct bgp_channel_config
{
135 struct channel_config c
;
138 const struct bgp_af_desc
*desc
;
140 ip_addr next_hop_addr
; /* Local address for NEXT_HOP attribute */
141 u8 next_hop_self
; /* Always set next hop to local IP address (NH_*) */
142 u8 next_hop_keep
; /* Do not modify next hop attribute (NH_*) */
143 u8 mandatory
; /* Channel is mandatory in capability negotiation */
144 u8 missing_lladdr
; /* What we will do when we don' know link-local addr, see MLL_* */
145 u8 gw_mode
; /* How we compute route gateway from next_hop attr, see GW_* */
146 u8 secondary
; /* Accept also non-best routes (i.e. RA_ACCEPTED) */
147 u8 gr_able
; /* Allow full graceful restart for the channel */
148 u8 llgr_able
; /* Allow full long-lived GR for the channel */
149 uint llgr_time
; /* Long-lived graceful restart stale time */
150 u8 ext_next_hop
; /* Allow both IPv4 and IPv6 next hops */
151 u8 add_path
; /* Use ADD-PATH extension [RFC 7911] */
152 u8 import_table
; /* Use c.in_table as Adj-RIB-In */
154 uint rest
[0]; /* Remaining items are reconfigured separately */
155 struct rtable_config
*igp_table_ip4
; /* Table for recursive IPv4 next hop lookups */
156 struct rtable_config
*igp_table_ip6
; /* Table for recursive IPv6 next hop lookups */
159 #define BGP_PT_INTERNAL 1
160 #define BGP_PT_EXTERNAL 2
172 #define GW_RECURSIVE 2
174 #define BGP_ADD_PATH_RX 1
175 #define BGP_ADD_PATH_TX 2
176 #define BGP_ADD_PATH_FULL 3
178 #define BGP_GR_ABLE 1
179 #define BGP_GR_AWARE 2
181 /* For GR capability common flags */
182 #define BGP_GRF_RESTART 0x80
184 /* For GR capability per-AF flags */
185 #define BGP_GRF_FORWARDING 0x80
187 #define BGP_LLGR_ABLE 1
188 #define BGP_LLGR_AWARE 2
190 #define BGP_LLGRF_FORWARDING 0x80
192 #define BGP_GRS_NONE 0 /* No GR */
193 #define BGP_GRS_ACTIVE 1 /* Graceful restart per RFC 4724 */
194 #define BGP_GRS_LLGR 2 /* Long-lived GR phase (stale timer active) */
196 #define BGP_BFD_GRACEFUL 2 /* BFD down triggers graceful restart */
201 u8 ready
; /* Multiprotocol capability, RFC 4760 */
202 u8 gr_able
; /* Graceful restart support, RFC 4724 */
203 u8 gr_af_flags
; /* Graceful restart per-AF flags */
204 u8 llgr_able
; /* Long-lived GR, RFC draft */
205 u32 llgr_time
; /* Long-lived GR stale time */
206 u8 llgr_flags
; /* Long-lived GR per-AF flags */
207 u8 ext_next_hop
; /* Extended IPv6 next hop, RFC 5549 */
208 u8 add_path
; /* Multiple paths support, RFC 7911 */
212 u32 as4_number
; /* Announced ASN */
214 u8 as4_support
; /* Four-octet AS capability, RFC 6793 */
215 u8 ext_messages
; /* Extended message length, RFC draft */
216 u8 route_refresh
; /* Route refresh capability, RFC 2918 */
217 u8 enhanced_refresh
; /* Enhanced route refresh, RFC 7313 */
219 u8 gr_aware
; /* Graceful restart capability, RFC 4724 */
220 u8 gr_flags
; /* Graceful restart flags */
221 u16 gr_time
; /* Graceful restart time in seconds */
223 u8 llgr_aware
; /* Long-lived GR capability, RFC draft */
224 u8 any_ext_next_hop
; /* Bitwise OR of per-AF ext_next_hop */
225 u8 any_add_path
; /* Bitwise OR of per-AF add_path */
227 u16 af_count
; /* Number of af_data items */
228 u16 length
; /* Length of capabilities in OPEN msg */
230 struct bgp_af_caps af_data
[0]; /* Per-AF capability data */
233 #define WALK_AF_CAPS(caps,ac) \
234 for (ac = caps->af_data; ac < &caps->af_data[caps->af_count]; ac++)
238 node n
; /* Node in global bgp_sockets */
239 sock
*sk
; /* Real listening socket */
240 u32 uc
; /* Use count */
244 struct bgp_proto
*bgp
;
246 u8 state
; /* State of connection state machine */
247 u8 as4_session
; /* Session uses 4B AS numbers in AS_PATH (both sides support it) */
248 u8 ext_messages
; /* Session uses extended message length */
249 u32 received_as
; /* ASN received in OPEN message */
251 struct bgp_caps
*local_caps
;
252 struct bgp_caps
*remote_caps
;
253 timer
*connect_timer
;
255 timer
*keepalive_timer
;
257 u32 packets_to_send
; /* Bitmap of packet types to be sent */
258 u32 channels_to_send
; /* Bitmap of channels with packets to be sent */
259 u8 last_channel
; /* Channel used last time for TX */
260 u8 last_channel_count
; /* Number of times the last channel was used in succession */
261 int notify_code
, notify_subcode
, notify_size
;
264 uint hold_time
, keepalive_time
; /* Times calculated from my and neighbor's requirements */
269 const struct bgp_config
*cf
; /* Shortcut to BGP configuration */
270 ip_addr local_ip
, remote_ip
;
271 u32 local_as
, remote_as
;
272 u32 public_as
; /* Externally visible ASN (local_as or confederation id) */
273 u32 local_id
; /* BGP identifier of this router */
274 u32 remote_id
; /* BGP identifier of the neighbor */
275 u32 rr_cluster_id
; /* Route reflector cluster ID */
276 u8 start_state
; /* Substates that partitions BS_START */
277 u8 is_internal
; /* Internal BGP session (local_as == remote_as) */
278 u8 is_interior
; /* Internal or intra-confederation BGP session */
279 u8 as4_session
; /* Session uses 4B AS numbers in AS_PATH (both sides support it) */
280 u8 rr_client
; /* Whether neighbor is RR client of me */
281 u8 rs_client
; /* Whether neighbor is RS client of me */
282 u8 ipv4
; /* Use IPv4 connection, i.e. remote_ip is IPv4 */
283 u8 passive
; /* Do not initiate outgoing connection */
284 u8 route_refresh
; /* Route refresh allowed to send [RFC 2918] */
285 u8 enhanced_refresh
; /* Enhanced refresh is negotiated [RFC 7313] */
286 u8 gr_ready
; /* Neighbor could do graceful restart */
287 u8 llgr_ready
; /* Neighbor could do Long-lived GR, implies gr_ready */
288 u8 gr_active_num
; /* Neighbor is doing GR, number of active channels */
289 u8 channel_count
; /* Number of active channels */
290 u8 summary_add_path_rx
; /* Summary state of ADD_PATH RX w.r.t active channels */
291 u32
*afi_map
; /* Map channel index -> AFI */
292 struct bgp_channel
**channel_map
; /* Map channel index -> channel */
293 struct bgp_conn
*conn
; /* Connection we have established */
294 struct bgp_conn outgoing_conn
; /* Outgoing connection we're working with */
295 struct bgp_conn incoming_conn
; /* Incoming connection we have neither accepted nor rejected yet */
296 struct object_lock
*lock
; /* Lock for neighbor connection */
297 struct neighbor
*neigh
; /* Neighbor entry corresponding to remote ip, NULL if multihop */
298 struct bgp_socket
*sock
; /* Shared listening socket */
299 struct bfd_request
*bfd_req
; /* BFD request, if BFD is used */
300 struct birdsock
*postponed_sk
; /* Postponed incoming socket for dynamic BGP */
301 ip_addr link_addr
; /* Link-local version of local_ip */
302 event
*event
; /* Event for respawning and shutting process */
303 timer
*startup_timer
; /* Timer used to delay protocol startup due to previous errors (startup_delay) */
304 timer
*gr_timer
; /* Timer waiting for reestablishment after graceful restart */
305 int dynamic_name_counter
; /* Counter for dynamic BGP names */
306 uint startup_delay
; /* Delay (in seconds) of protocol startup due to previous errors */
307 btime last_proto_error
; /* Time of last error that leads to protocol stop */
308 u8 last_error_class
; /* Error class of last error */
309 u32 last_error_code
; /* Error code of last error. BGP protocol errors
310 are encoded as (bgp_err_code << 16 | bgp_err_subcode) */
316 /* Rest are BGP specific data */
317 struct bgp_channel_config
*cf
;
321 const struct bgp_af_desc
*desc
;
323 rtable
*igp_table_ip4
; /* Table for recursive IPv4 next hop lookups */
324 rtable
*igp_table_ip6
; /* Table for recursive IPv6 next hop lookups */
326 /* Rest are zeroed when down */
328 HASH(struct bgp_bucket
) bucket_hash
; /* Hash table of route buckets */
329 struct bgp_bucket
*withdraw_bucket
; /* Withdrawn routes */
330 list bucket_queue
; /* Queue of buckets to send (struct bgp_bucket) */
332 HASH(struct bgp_prefix
) prefix_hash
; /* Prefixes to be sent */
333 slab
*prefix_slab
; /* Slab holding prefix nodes */
335 ip_addr next_hop_addr
; /* Local address for NEXT_HOP attribute */
336 ip_addr link_addr
; /* Link-local version of next_hop_addr */
338 u32 packets_to_send
; /* Bitmap of packet types to be sent */
340 u8 ext_next_hop
; /* Session allows both IPv4 and IPv6 next hops */
342 u8 gr_ready
; /* Neighbor could do GR on this AF */
343 u8 gr_active
; /* Neighbor is doing GR (BGP_GRS_*) */
345 timer
*stale_timer
; /* Long-lived stale timer for LLGR */
346 u32 stale_time
; /* Stored LLGR stale time from last session */
348 u8 add_path_rx
; /* Session expects receive of ADD-PATH extended NLRI */
349 u8 add_path_tx
; /* Session expects transmit of ADD-PATH extended NLRI */
351 u8 feed_state
; /* Feed state (TX) for EoR, RR packets, see BFS_* */
352 u8 load_state
; /* Load state (RX) for EoR, RR packets, see BFS_* */
356 node buck_node
; /* Node in per-bucket list */
357 struct bgp_prefix
*next
; /* Node in prefix hash table */
364 node send_node
; /* Node in send queue */
365 struct bgp_bucket
*next
; /* Node in bucket hash table */
366 list prefixes
; /* Prefixes in this bucket (struct bgp_prefix) */
367 u32 hash
; /* Hash over extended attributes */
368 ea_list eattrs
[0]; /* Per-bucket extended attributes */
371 struct bgp_export_state
{
372 struct bgp_proto
*proto
;
373 struct bgp_channel
*channel
;
374 struct linpool
*pool
;
376 struct bgp_proto
*src
;
384 struct bgp_write_state
{
385 struct bgp_proto
*proto
;
386 struct bgp_channel
*channel
;
387 struct linpool
*pool
;
395 const adata
*mpls_labels
;
398 struct bgp_parse_state
{
399 struct bgp_proto
*proto
;
400 struct bgp_channel
*channel
;
401 struct linpool
*pool
;
407 u32 attrs_seen
[256/32];
415 uint ip_next_hop_len
;
418 uint mp_next_hop_len
;
422 byte
*ip_unreach_nlri
;
423 byte
*ip_next_hop_data
;
425 byte
*mp_unreach_nlri
;
426 byte
*mp_next_hop_data
;
432 struct hostentry
*hostentry
;
435 /* Cached state for bgp_rte_update() */
437 struct rte_src
*last_src
;
442 #define BGP_VERSION 4
443 #define BGP_HEADER_LENGTH 19
444 #define BGP_MAX_MESSAGE_LENGTH 4096
445 #define BGP_MAX_EXT_MSG_LENGTH 65535
446 #define BGP_RX_BUFFER_SIZE 4096
447 #define BGP_TX_BUFFER_SIZE 4096
448 #define BGP_RX_BUFFER_EXT_SIZE 65535
449 #define BGP_TX_BUFFER_EXT_SIZE 65535
451 static inline int bgp_channel_is_ipv4(struct bgp_channel
*c
)
452 { return BGP_AFI(c
->afi
) == BGP_AFI_IPV4
; }
454 static inline int bgp_channel_is_ipv6(struct bgp_channel
*c
)
455 { return BGP_AFI(c
->afi
) == BGP_AFI_IPV6
; }
457 static inline int bgp_cc_is_ipv4(struct bgp_channel_config
*c
)
458 { return BGP_AFI(c
->afi
) == BGP_AFI_IPV4
; }
460 static inline int bgp_cc_is_ipv6(struct bgp_channel_config
*c
)
461 { return BGP_AFI(c
->afi
) == BGP_AFI_IPV6
; }
463 static inline uint
bgp_max_packet_length(struct bgp_conn
*conn
)
464 { return conn
->ext_messages
? BGP_MAX_EXT_MSG_LENGTH
: BGP_MAX_MESSAGE_LENGTH
; }
467 bgp_parse_error(struct bgp_parse_state
*s
, uint subcode
)
469 s
->err_subcode
= subcode
;
470 longjmp(s
->err_jmpbuf
, 1);
473 extern struct linpool
*bgp_linpool
;
474 extern struct linpool
*bgp_linpool2
;
477 void bgp_start_timer(timer
*t
, uint value
);
478 void bgp_check_config(struct bgp_config
*c
);
479 void bgp_error(struct bgp_conn
*c
, unsigned code
, unsigned subcode
, byte
*data
, int len
);
480 void bgp_close_conn(struct bgp_conn
*c
);
481 void bgp_update_startup_delay(struct bgp_proto
*p
);
482 void bgp_conn_enter_openconfirm_state(struct bgp_conn
*conn
);
483 void bgp_conn_enter_established_state(struct bgp_conn
*conn
);
484 void bgp_conn_enter_close_state(struct bgp_conn
*conn
);
485 void bgp_conn_enter_idle_state(struct bgp_conn
*conn
);
486 void bgp_handle_graceful_restart(struct bgp_proto
*p
);
487 void bgp_graceful_restart_done(struct bgp_channel
*c
);
488 void bgp_refresh_begin(struct bgp_channel
*c
);
489 void bgp_refresh_end(struct bgp_channel
*c
);
490 void bgp_store_error(struct bgp_proto
*p
, struct bgp_conn
*c
, u8
class, u32 code
);
491 void bgp_stop(struct bgp_proto
*p
, int subcode
, byte
*data
, uint len
);
493 struct rte_source
*bgp_find_source(struct bgp_proto
*p
, u32 path_id
);
494 struct rte_source
*bgp_get_source(struct bgp_proto
*p
, u32 path_id
);
499 #define BGP_FORCE_DEBUG 1
501 #define BGP_FORCE_DEBUG 0
503 #define BGP_TRACE(flags, msg, args...) do { if ((p->p.debug & flags) || BGP_FORCE_DEBUG) \
504 log(L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
506 #define BGP_TRACE_RL(rl, flags, msg, args...) do { if ((p->p.debug & flags) || BGP_FORCE_DEBUG) \
507 log_rl(rl, L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
512 static inline eattr
*
513 bgp_find_attr(ea_list
*attrs
, uint code
)
515 return ea_find(attrs
, EA_CODE(PROTOCOL_BGP
, code
));
519 bgp_set_attr(ea_list
**attrs
, struct linpool
*pool
, uint code
, uint flags
, uintptr_t val
);
522 bgp_set_attr_u32(ea_list
**to
, struct linpool
*pool
, uint code
, uint flags
, u32 val
)
523 { bgp_set_attr(to
, pool
, code
, flags
, (uintptr_t) val
); }
526 bgp_set_attr_ptr(ea_list
**to
, struct linpool
*pool
, uint code
, uint flags
, const struct adata
*val
)
527 { bgp_set_attr(to
, pool
, code
, flags
, (uintptr_t) val
); }
530 bgp_set_attr_data(ea_list
**to
, struct linpool
*pool
, uint code
, uint flags
, void *data
, uint len
)
532 struct adata
*a
= lp_alloc_adata(pool
, len
);
533 memcpy(a
->data
, data
, len
);
534 bgp_set_attr(to
, pool
, code
, flags
, (uintptr_t) a
);
538 bgp_unset_attr(ea_list
**to
, struct linpool
*pool
, uint code
)
539 { eattr
*e
= bgp_set_attr(to
, pool
, code
, 0, 0); e
->type
= EAF_TYPE_UNDEF
; }
542 int bgp_encode_attrs(struct bgp_write_state
*s
, ea_list
*attrs
, byte
*buf
, byte
*end
);
543 ea_list
* bgp_decode_attrs(struct bgp_parse_state
*s
, byte
*data
, uint len
);
545 void bgp_init_bucket_table(struct bgp_channel
*c
);
546 void bgp_free_bucket_table(struct bgp_channel
*c
);
547 void bgp_free_bucket(struct bgp_channel
*c
, struct bgp_bucket
*b
);
548 void bgp_defer_bucket(struct bgp_channel
*c
, struct bgp_bucket
*b
);
549 void bgp_withdraw_bucket(struct bgp_channel
*c
, struct bgp_bucket
*b
);
551 void bgp_init_prefix_table(struct bgp_channel
*c
);
552 void bgp_free_prefix_table(struct bgp_channel
*c
);
553 void bgp_free_prefix(struct bgp_channel
*c
, struct bgp_prefix
*bp
);
555 int bgp_rte_better(struct rte
*, struct rte
*);
556 int bgp_rte_mergable(rte
*pri
, rte
*sec
);
557 int bgp_rte_recalculate(rtable
*table
, net
*net
, rte
*new, rte
*old
, rte
*old_best
);
558 struct rte
*bgp_rte_modify_stale(struct rte
*r
, struct linpool
*pool
);
559 void bgp_rt_notify(struct proto
*P
, struct channel
*C
, net
*n
, rte
*new, rte
*old
);
560 int bgp_preexport(struct proto
*, struct rte
**, struct linpool
*);
561 int bgp_get_attr(struct eattr
*e
, byte
*buf
, int buflen
);
562 void bgp_get_route_info(struct rte
*, byte
*buf
);
567 void bgp_dump_state_change(struct bgp_conn
*conn
, uint old
, uint
new);
568 void bgp_prepare_capabilities(struct bgp_conn
*conn
);
569 const struct bgp_af_desc
*bgp_get_af_desc(u32 afi
);
570 const struct bgp_af_caps
*bgp_find_af_caps(struct bgp_caps
*caps
, u32 afi
);
571 void bgp_schedule_packet(struct bgp_conn
*conn
, struct bgp_channel
*c
, int type
);
572 void bgp_kick_tx(void *vconn
);
573 void bgp_tx(struct birdsock
*sk
);
574 int bgp_rx(struct birdsock
*sk
, uint size
);
575 const char * bgp_error_dsc(unsigned code
, unsigned subcode
);
576 void bgp_log_error(struct bgp_proto
*p
, u8
class, char *msg
, unsigned code
, unsigned subcode
, byte
*data
, unsigned len
);
578 void bgp_update_next_hop(struct bgp_export_state
*s
, eattr
*a
, ea_list
**to
);
583 #define PKT_OPEN 0x01
584 #define PKT_UPDATE 0x02
585 #define PKT_NOTIFICATION 0x03
586 #define PKT_KEEPALIVE 0x04
587 #define PKT_ROUTE_REFRESH 0x05 /* [RFC2918] */
588 #define PKT_BEGIN_REFRESH 0x1e /* Dummy type for BoRR packet [RFC7313] */
589 #define PKT_SCHEDULE_CLOSE 0x1f /* Used internally to schedule socket close */
593 #define BAF_OPTIONAL 0x80
594 #define BAF_TRANSITIVE 0x40
595 #define BAF_PARTIAL 0x20
596 #define BAF_EXT_LEN 0x10
598 #define BA_ORIGIN 0x01 /* RFC 4271 */ /* WM */
599 #define BA_AS_PATH 0x02 /* WM */
600 #define BA_NEXT_HOP 0x03 /* WM */
601 #define BA_MULTI_EXIT_DISC 0x04 /* ON */
602 #define BA_LOCAL_PREF 0x05 /* WD */
603 #define BA_ATOMIC_AGGR 0x06 /* WD */
604 #define BA_AGGREGATOR 0x07 /* OT */
605 #define BA_COMMUNITY 0x08 /* RFC 1997 */ /* OT */
606 #define BA_ORIGINATOR_ID 0x09 /* RFC 4456 */ /* ON */
607 #define BA_CLUSTER_LIST 0x0a /* RFC 4456 */ /* ON */
608 #define BA_MP_REACH_NLRI 0x0e /* RFC 4760 */
609 #define BA_MP_UNREACH_NLRI 0x0f /* RFC 4760 */
610 #define BA_EXT_COMMUNITY 0x10 /* RFC 4360 */
611 #define BA_AS4_PATH 0x11 /* RFC 6793 */
612 #define BA_AS4_AGGREGATOR 0x12 /* RFC 6793 */
613 #define BA_LARGE_COMMUNITY 0x20 /* RFC 8092 */
615 /* Bird's private internal BGP attributes */
616 #define BA_MPLS_LABEL_STACK 0xfe /* MPLS label stack transfer attribute */
618 /* BGP connection states */
621 #define BS_CONNECT 1 /* Attempting to connect */
622 #define BS_ACTIVE 2 /* Waiting for connection retry & listening */
623 #define BS_OPENSENT 3
624 #define BS_OPENCONFIRM 4
625 #define BS_ESTABLISHED 5
626 #define BS_CLOSE 6 /* Used during transition to BS_IDLE */
632 * Used in PS_START for fine-grained specification of starting state.
634 * When BGP protocol is started by core, it goes to BSS_PREPARE. When BGP
635 * protocol done what is neccessary to start itself (like acquiring the lock),
636 * it goes to BSS_CONNECT.
639 #define BSS_PREPARE 0 /* Used before ordinary BGP started, i. e. waiting for lock */
640 #define BSS_DELAY 1 /* Startup delay due to previous errors */
641 #define BSS_CONNECT 2 /* Ordinary BGP connecting */
644 /* BGP feed states (TX)
646 * RFC 4724 specifies that an initial feed should end with End-of-RIB mark.
648 * RFC 7313 specifies that a route refresh should be demarcated by BoRR and EoRR packets.
650 * These states (stored in c->feed_state) are used to keep track of these
651 * requirements. When such feed is started, BFS_LOADING / BFS_REFRESHING is
652 * set. When it ended, BFS_LOADED / BFS_REFRESHED is set to schedule End-of-RIB
653 * or EoRR packet. When the packet is sent, the state returned to BFS_NONE.
655 * Note that when a non-demarcated feed (e.g. plain RFC 4271 initial load
656 * without End-of-RIB or plain RFC 2918 route refresh without BoRR/EoRR
657 * demarcation) is active, BFS_NONE is set.
659 * BFS_NONE, BFS_LOADING and BFS_REFRESHING are also used as load states (RX)
660 * with correspondent semantics (-, expecting End-of-RIB, expecting EoRR).
663 #define BFS_NONE 0 /* No feed or original non-demarcated feed */
664 #define BFS_LOADING 1 /* Initial feed active, End-of-RIB planned */
665 #define BFS_LOADED 2 /* Loading done, End-of-RIB marker scheduled */
666 #define BFS_REFRESHING 3 /* Route refresh (introduced by BoRR) active */
667 #define BFS_REFRESHED 4 /* Refresh done, EoRR packet scheduled */
673 #define BE_MISC 1 /* Miscellaneous error */
674 #define BE_SOCKET 2 /* Socket error */
675 #define BE_BGP_RX 3 /* BGP protocol error notification received */
676 #define BE_BGP_TX 4 /* BGP protocol error notification sent */
677 #define BE_AUTO_DOWN 5 /* Automatic shutdown */
678 #define BE_MAN_DOWN 6 /* Manual shutdown */
680 /* Misc error codes */
682 #define BEM_NEIGHBOR_LOST 1
683 #define BEM_INVALID_NEXT_HOP 2
684 #define BEM_INVALID_MD5 3 /* MD5 authentication kernel request failed (possibly not supported) */
685 #define BEM_NO_SOCKET 4
686 #define BEM_LINK_DOWN 5
687 #define BEM_BFD_DOWN 6
688 #define BEM_GRACEFUL_RESTART 7
690 /* Automatic shutdown error codes */
692 #define BEA_ROUTE_LIMIT_EXCEEDED 1
694 /* Well-known communities */
696 #define BGP_COMM_NO_EXPORT 0xffffff01 /* Don't export outside local AS / confed. */
697 #define BGP_COMM_NO_ADVERTISE 0xffffff02 /* Don't export at all */
698 #define BGP_COMM_NO_EXPORT_SUBCONFED 0xffffff03 /* NO_EXPORT even in local confederation */
700 #define BGP_COMM_LLGR_STALE 0xffff0006 /* Route is stale according to LLGR */
701 #define BGP_COMM_NO_LLGR 0xffff0007 /* Do not treat the route according to LLGR */
707 #define ORIGIN_INCOMPLETE 2