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_FLOW 133
38 /* Internal AF codes */
40 #define BGP_AF(A, B) (((u32)(A) << 16) | (u32)(B))
41 #define BGP_AFI(A) ((u32)(A) >> 16)
42 #define BGP_SAFI(A) ((u32)(A) & 0xFFFF)
44 #define BGP_AF_IPV4 BGP_AF( BGP_AFI_IPV4, BGP_SAFI_UNICAST )
45 #define BGP_AF_IPV6 BGP_AF( BGP_AFI_IPV6, BGP_SAFI_UNICAST )
46 #define BGP_AF_IPV4_MC BGP_AF( BGP_AFI_IPV4, BGP_SAFI_MULTICAST )
47 #define BGP_AF_IPV6_MC BGP_AF( BGP_AFI_IPV6, BGP_SAFI_MULTICAST )
48 #define BGP_AF_IPV4_MPLS BGP_AF( BGP_AFI_IPV4, BGP_SAFI_MPLS )
49 #define BGP_AF_IPV6_MPLS BGP_AF( BGP_AFI_IPV6, BGP_SAFI_MPLS )
50 #define BGP_AF_VPN4_MPLS BGP_AF( BGP_AFI_IPV4, BGP_SAFI_MPLS_VPN )
51 #define BGP_AF_VPN6_MPLS BGP_AF( BGP_AFI_IPV6, BGP_SAFI_MPLS_VPN )
52 #define BGP_AF_FLOW4 BGP_AF( BGP_AFI_IPV4, BGP_SAFI_FLOW )
53 #define BGP_AF_FLOW6 BGP_AF( BGP_AFI_IPV6, BGP_SAFI_FLOW )
56 struct bgp_write_state
;
57 struct bgp_parse_state
;
58 struct bgp_export_state
;
67 uint (*encode_nlri
)(struct bgp_write_state
*s
, struct bgp_bucket
*buck
, byte
*buf
, uint size
);
68 void (*decode_nlri
)(struct bgp_parse_state
*s
, byte
*pos
, uint len
, rta
*a
);
69 void (*update_next_hop
)(struct bgp_export_state
*s
, eattr
*nh
, ea_list
**to
);
70 uint (*encode_next_hop
)(struct bgp_write_state
*s
, eattr
*nh
, byte
*buf
, uint size
);
71 void (*decode_next_hop
)(struct bgp_parse_state
*s
, byte
*pos
, uint len
, rta
*a
);
76 struct proto_config c
;
77 u32 local_as
, remote_as
;
78 ip_addr local_ip
; /* Source address to use */
80 struct iface
*iface
; /* Interface for link-local addresses */
81 u16 local_port
; /* Local listening port */
82 u16 remote_port
; /* Neighbor destination port */
83 int multihop
; /* Number of hops if multihop */
84 int strict_bind
; /* Bind listening socket to local address */
85 int ttl_security
; /* Enable TTL security [RFC 5082] */
86 int compare_path_lengths
; /* Use path lengths when selecting best route */
87 int med_metric
; /* Compare MULTI_EXIT_DISC even between routes from differen ASes */
88 int igp_metric
; /* Use IGP metrics when selecting best route */
89 int prefer_older
; /* Prefer older routes according to RFC 5004 */
90 int deterministic_med
; /* Use more complicated algo to have strict RFC 4271 MED comparison */
91 u32 default_local_pref
; /* Default value for LOCAL_PREF attribute */
92 u32 default_med
; /* Default value for MULTI_EXIT_DISC attribute */
93 int capabilities
; /* Enable capability handshake [RFC 3392] */
94 int enable_refresh
; /* Enable local support for route refresh [RFC 2918] */
95 int enable_as4
; /* Enable local support for 4B AS numbers [RFC 4893] */
96 int enable_extended_messages
; /* Enable local support for extended messages [draft] */
97 u32 rr_cluster_id
; /* Route reflector cluster ID, if different from local ID */
98 int rr_client
; /* Whether neighbor is RR client of me */
99 int rs_client
; /* Whether neighbor is RS client of me */
100 u32 confederation
; /* Confederation ID, or zero if confeds not active */
101 int confederation_member
; /* Whether neighbor AS is member of our confederation */
102 int passive
; /* Do not initiate outgoing connection */
103 int interpret_communities
; /* Hardwired handling of well-known communities */
104 int allow_local_as
; /* Allow that number of local ASNs in incoming AS_PATHs */
105 int gr_mode
; /* Graceful restart mode (BGP_GR_*) */
106 int setkey
; /* Set MD5 password to system SA/SP database */
107 unsigned gr_time
; /* Graceful restart timeout */
108 unsigned connect_delay_time
; /* Minimum delay between connect attempts */
109 unsigned connect_retry_time
; /* Timeout for connect attempts */
110 unsigned hold_time
, initial_hold_time
;
111 unsigned keepalive_time
;
112 unsigned error_amnesia_time
; /* Errors are forgotten after */
113 unsigned error_delay_time_min
; /* Time to wait after an error is detected */
114 unsigned error_delay_time_max
;
115 unsigned disable_after_error
; /* Disable the protocol when error is detected */
117 char *password
; /* Password used for MD5 authentication */
118 int check_link
; /* Use iface link state for liveness detection */
119 int bfd
; /* Use BFD for liveness detection */
122 struct bgp_channel_config
{
123 struct channel_config c
;
126 const struct bgp_af_desc
*desc
;
128 ip_addr next_hop_addr
; /* Local address for NEXT_HOP attribute */
129 u8 next_hop_self
; /* Always set next hop to local IP address */
130 u8 next_hop_keep
; /* Do not touch next hop attribute */
131 u8 missing_lladdr
; /* What we will do when we don' know link-local addr, see MLL_* */
132 u8 gw_mode
; /* How we compute route gateway from next_hop attr, see GW_* */
133 u8 secondary
; /* Accept also non-best routes (i.e. RA_ACCEPTED) */
134 u8 gr_able
; /* Allow full graceful restart for the channel */
135 u8 ext_next_hop
; /* Allow both IPv4 and IPv6 next hops */
136 u8 add_path
; /* Use ADD-PATH extension [RFC 7911] */
138 uint rest
[0]; /* Remaining items are reconfigured separately */
139 struct rtable_config
*igp_table_ip4
; /* Table for recursive IPv4 next hop lookups */
140 struct rtable_config
*igp_table_ip6
; /* Table for recursive IPv6 next hop lookups */
148 #define GW_RECURSIVE 2
150 #define BGP_ADD_PATH_RX 1
151 #define BGP_ADD_PATH_TX 2
152 #define BGP_ADD_PATH_FULL 3
154 #define BGP_GR_ABLE 1
155 #define BGP_GR_AWARE 2
157 /* For GR capability common flags */
158 #define BGP_GRF_RESTART 0x80
160 /* For GR capability per-AF flags */
161 #define BGP_GRF_FORWARDING 0x80
166 u8 ready
; /* Multiprotocol capability, RFC 4760 */
167 u8 gr_able
; /* Graceful restart support, RFC 4724 */
168 u8 gr_af_flags
; /* Graceful restart per-AF flags */
169 u8 ext_next_hop
; /* Extended IPv6 next hop, RFC 5549 */
170 u8 add_path
; /* Multiple paths support, RFC 7911 */
174 u32 as4_number
; /* Announced ASN */
176 u8 as4_support
; /* Four-octet AS capability, RFC 6793 */
177 u8 ext_messages
; /* Extended message length, RFC draft */
178 u8 route_refresh
; /* Route refresh capability, RFC 2918 */
179 u8 enhanced_refresh
; /* Enhanced route refresh, RFC 7313 */
181 u8 gr_aware
; /* Graceful restart capability, RFC 4724 */
182 u8 gr_flags
; /* Graceful restart flags */
183 u16 gr_time
; /* Graceful restart time in seconds */
185 u16 af_count
; /* Number of af_data items */
187 struct bgp_af_caps af_data
[0]; /* Per-AF capability data */
190 #define WALK_AF_CAPS(caps,ac) \
191 for (ac = caps->af_data; ac < &caps->af_data[caps->af_count]; ac++)
195 node n
; /* Node in global bgp_sockets */
196 sock
*sk
; /* Real listening socket */
197 u32 uc
; /* Use count */
201 struct bgp_proto
*bgp
;
203 u8 state
; /* State of connection state machine */
204 u8 as4_session
; /* Session uses 4B AS numbers in AS_PATH (both sides support it) */
205 u8 ext_messages
; /* Session uses extended message length */
207 struct bgp_caps
*local_caps
;
208 struct bgp_caps
*remote_caps
;
209 struct timer
*connect_timer
;
210 struct timer
*hold_timer
;
211 struct timer
*keepalive_timer
;
213 u32 packets_to_send
; /* Bitmap of packet types to be sent */
214 u32 channels_to_send
; /* Bitmap of channels with packets to be sent */
215 u8 last_channel
; /* Channel used last time for TX */
216 u8 last_channel_count
; /* Number of times the last channel was used in succession */
217 int notify_code
, notify_subcode
, notify_size
;
220 uint hold_time
, keepalive_time
; /* Times calculated from my and neighbor's requirements */
225 struct bgp_config
*cf
; /* Shortcut to BGP configuration */
226 u32 local_as
, remote_as
;
227 u32 public_as
; /* Externally visible ASN (local_as or confederation id) */
228 u32 local_id
; /* BGP identifier of this router */
229 u32 remote_id
; /* BGP identifier of the neighbor */
230 u32 rr_cluster_id
; /* Route reflector cluster ID */
231 int start_state
; /* Substates that partitions BS_START */
232 u8 is_internal
; /* Internal BGP session (local_as == remote_as) */
233 u8 is_interior
; /* Internal or intra-confederation BGP session */
234 u8 as4_session
; /* Session uses 4B AS numbers in AS_PATH (both sides support it) */
235 u8 rr_client
; /* Whether neighbor is RR client of me */
236 u8 rs_client
; /* Whether neighbor is RS client of me */
237 u8 route_refresh
; /* Route refresh allowed to send [RFC 2918] */
238 u8 enhanced_refresh
; /* Enhanced refresh is negotiated [RFC 7313] */
239 u8 gr_ready
; /* Neighbor could do graceful restart */
240 u8 gr_active_num
; /* Neighbor is doing GR, number of active channels */
241 u8 channel_count
; /* Number of active channels */
242 u32
*afi_map
; /* Map channel index -> AFI */
243 struct bgp_channel
**channel_map
; /* Map channel index -> channel */
244 struct bgp_conn
*conn
; /* Connection we have established */
245 struct bgp_conn outgoing_conn
; /* Outgoing connection we're working with */
246 struct bgp_conn incoming_conn
; /* Incoming connection we have neither accepted nor rejected yet */
247 struct object_lock
*lock
; /* Lock for neighbor connection */
248 struct neighbor
*neigh
; /* Neighbor entry corresponding to remote ip, NULL if multihop */
249 struct bgp_socket
*sock
; /* Shared listening socket */
250 struct bfd_request
*bfd_req
; /* BFD request, if BFD is used */
251 ip_addr source_addr
; /* Local address used as an advertised next hop */
252 ip_addr link_addr
; /* Link-local version of source_addr */
253 struct event
*event
; /* Event for respawning and shutting process */
254 struct timer
*startup_timer
; /* Timer used to delay protocol startup due to previous errors (startup_delay) */
255 struct timer
*gr_timer
; /* Timer waiting for reestablishment after graceful restart */
256 unsigned startup_delay
; /* Time to delay protocol startup by due to errors */
257 bird_clock_t last_proto_error
; /* Time of last error that leads to protocol stop */
258 u8 last_error_class
; /* Error class of last error */
259 u32 last_error_code
; /* Error code of last error. BGP protocol errors
260 are encoded as (bgp_err_code << 16 | bgp_err_subcode) */
266 /* Rest are BGP specific data */
267 struct bgp_channel_config
*cf
;
268 pool
*pool
; /* XXXX */
272 const struct bgp_af_desc
*desc
;
274 HASH(struct bgp_bucket
) bucket_hash
; /* Hash table of route buckets */
275 struct bgp_bucket
*withdraw_bucket
; /* Withdrawn routes */
276 list bucket_queue
; /* Queue of buckets to send (struct bgp_bucket) */
278 HASH(struct bgp_prefix
) prefix_hash
; /* Prefixes to be sent */
279 slab
*prefix_slab
; /* Slab holding prefix nodes */
281 rtable
*igp_table_ip4
; /* Table for recursive IPv4 next hop lookups */
282 rtable
*igp_table_ip6
; /* Table for recursive IPv6 next hop lookups */
283 ip_addr next_hop_addr
; /* Local address for NEXT_HOP attribute */
284 ip_addr link_addr
; /* Link-local version of next_hop_addr */
286 u32 packets_to_send
; /* Bitmap of packet types to be sent */
288 u8 gr_ready
; /* Neighbor could do GR on this AF */
289 u8 gr_active
; /* Neighbor is doing GR and keeping fwd state */
291 u8 ext_next_hop
; /* Session allows both IPv4 and IPv6 next hops */
293 u8 add_path_rx
; /* Session expects receive of ADD-PATH extended NLRI */
294 u8 add_path_tx
; /* Session expects transmit of ADD-PATH extended NLRI */
296 u8 feed_state
; /* Feed state (TX) for EoR, RR packets, see BFS_* */
297 u8 load_state
; /* Load state (RX) for EoR, RR packets, see BFS_* */
301 node buck_node
; /* Node in per-bucket list */
302 struct bgp_prefix
*next
; /* Node in prefix hash table */
309 node send_node
; /* Node in send queue */
310 struct bgp_bucket
*next
; /* Node in bucket hash table */
311 list prefixes
; /* Prefixes in this bucket (struct bgp_prefix) */
312 u32 hash
; /* Hash over extended attributes */
313 ea_list eattrs
[0]; /* Per-bucket extended attributes */
316 struct bgp_export_state
{
317 struct bgp_proto
*proto
;
318 struct bgp_channel
*channel
;
319 struct linpool
*pool
;
321 struct bgp_proto
*src
;
329 struct bgp_write_state
{
330 struct bgp_proto
*proto
;
331 struct bgp_channel
*channel
;
332 struct linpool
*pool
;
342 struct bgp_parse_state
{
343 struct bgp_proto
*proto
;
344 struct bgp_channel
*channel
;
345 struct linpool
*pool
;
351 u32 attrs_seen
[256/32];
359 uint ip_next_hop_len
;
362 uint mp_next_hop_len
;
366 byte
*ip_unreach_nlri
;
367 byte
*ip_next_hop_data
;
369 byte
*mp_unreach_nlri
;
370 byte
*mp_next_hop_data
;
376 struct hostentry
*hostentry
;
379 /* Cached state for bgp_rte_update() */
381 struct rte_src
*last_src
;
386 #define BGP_VERSION 4
387 #define BGP_HEADER_LENGTH 19
388 #define BGP_MAX_MESSAGE_LENGTH 4096
389 #define BGP_MAX_EXT_MSG_LENGTH 65535
390 #define BGP_RX_BUFFER_SIZE 4096
391 #define BGP_TX_BUFFER_SIZE 4096
392 #define BGP_RX_BUFFER_EXT_SIZE 65535
393 #define BGP_TX_BUFFER_EXT_SIZE 65535
395 static inline int bgp_channel_is_ipv4(struct bgp_channel
*c
)
396 { return BGP_AFI(c
->afi
) == BGP_AFI_IPV4
; }
398 static inline int bgp_channel_is_ipv6(struct bgp_channel
*c
)
399 { return BGP_AFI(c
->afi
) == BGP_AFI_IPV6
; }
401 static inline int bgp_cc_is_ipv4(struct bgp_channel_config
*c
)
402 { return BGP_AFI(c
->afi
) == BGP_AFI_IPV4
; }
404 static inline int bgp_cc_is_ipv6(struct bgp_channel_config
*c
)
405 { return BGP_AFI(c
->afi
) == BGP_AFI_IPV6
; }
407 static inline uint
bgp_max_packet_length(struct bgp_conn
*conn
)
408 { return conn
->ext_messages
? BGP_MAX_EXT_MSG_LENGTH
: BGP_MAX_MESSAGE_LENGTH
; }
411 bgp_parse_error(struct bgp_parse_state
*s
, uint subcode
)
413 s
->err_subcode
= subcode
;
414 longjmp(s
->err_jmpbuf
, 1);
417 extern struct linpool
*bgp_linpool
;
418 extern struct linpool
*bgp_linpool2
;
421 void bgp_start_timer(struct timer
*t
, int value
);
422 void bgp_check_config(struct bgp_config
*c
);
423 void bgp_error(struct bgp_conn
*c
, unsigned code
, unsigned subcode
, byte
*data
, int len
);
424 void bgp_close_conn(struct bgp_conn
*c
);
425 void bgp_update_startup_delay(struct bgp_proto
*p
);
426 void bgp_conn_enter_openconfirm_state(struct bgp_conn
*conn
);
427 void bgp_conn_enter_established_state(struct bgp_conn
*conn
);
428 void bgp_conn_enter_close_state(struct bgp_conn
*conn
);
429 void bgp_conn_enter_idle_state(struct bgp_conn
*conn
);
430 void bgp_handle_graceful_restart(struct bgp_proto
*p
);
431 void bgp_graceful_restart_done(struct bgp_channel
*c
);
432 void bgp_refresh_begin(struct bgp_channel
*c
);
433 void bgp_refresh_end(struct bgp_channel
*c
);
434 void bgp_store_error(struct bgp_proto
*p
, struct bgp_conn
*c
, u8
class, u32 code
);
435 void bgp_stop(struct bgp_proto
*p
, unsigned subcode
);
437 struct rte_source
*bgp_find_source(struct bgp_proto
*p
, u32 path_id
);
438 struct rte_source
*bgp_get_source(struct bgp_proto
*p
, u32 path_id
);
443 #define BGP_FORCE_DEBUG 1
445 #define BGP_FORCE_DEBUG 0
447 #define BGP_TRACE(flags, msg, args...) do { if ((p->p.debug & flags) || BGP_FORCE_DEBUG) \
448 log(L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
450 #define BGP_TRACE_RL(rl, flags, msg, args...) do { if ((p->p.debug & flags) || BGP_FORCE_DEBUG) \
451 log_rl(rl, L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
456 static inline eattr
*
457 bgp_find_attr(ea_list
*attrs
, uint code
)
459 return ea_find(attrs
, EA_CODE(EAP_BGP
, code
));
463 bgp_set_attr(ea_list
**attrs
, struct linpool
*pool
, uint code
, uint flags
, uintptr_t val
);
466 bgp_set_attr_u32(ea_list
**to
, struct linpool
*pool
, uint code
, uint flags
, u32 val
)
467 { bgp_set_attr(to
, pool
, code
, flags
, (uintptr_t) val
); }
470 bgp_set_attr_ptr(ea_list
**to
, struct linpool
*pool
, uint code
, uint flags
, struct adata
*val
)
471 { bgp_set_attr(to
, pool
, code
, flags
, (uintptr_t) val
); }
474 bgp_set_attr_data(ea_list
**to
, struct linpool
*pool
, uint code
, uint flags
, void *data
, uint len
)
476 struct adata
*a
= lp_alloc_adata(pool
, len
);
477 memcpy(a
->data
, data
, len
);
478 bgp_set_attr(to
, pool
, code
, flags
, (uintptr_t) a
);
482 bgp_unset_attr(ea_list
**to
, struct linpool
*pool
, uint code
)
483 { eattr
*e
= bgp_set_attr(to
, pool
, code
, 0, 0); e
->type
= EAF_TYPE_UNDEF
; }
486 int bgp_encode_attrs(struct bgp_write_state
*s
, ea_list
*attrs
, byte
*buf
, byte
*end
);
487 ea_list
* bgp_decode_attrs(struct bgp_parse_state
*s
, byte
*data
, uint len
);
489 void bgp_init_bucket_table(struct bgp_channel
*c
);
490 void bgp_free_bucket(struct bgp_channel
*c
, struct bgp_bucket
*b
);
491 void bgp_defer_bucket(struct bgp_channel
*c
, struct bgp_bucket
*b
);
492 void bgp_withdraw_bucket(struct bgp_channel
*c
, struct bgp_bucket
*b
);
494 void bgp_init_prefix_table(struct bgp_channel
*c
);
495 void bgp_free_prefix(struct bgp_channel
*c
, struct bgp_prefix
*bp
);
497 int bgp_rte_better(struct rte
*, struct rte
*);
498 int bgp_rte_mergable(rte
*pri
, rte
*sec
);
499 int bgp_rte_recalculate(rtable
*table
, net
*net
, rte
*new, rte
*old
, rte
*old_best
);
500 void bgp_rt_notify(struct proto
*P
, struct channel
*C
, net
*n
, rte
*new, rte
*old
, ea_list
*attrs
);
501 int bgp_import_control(struct proto
*, struct rte
**, struct ea_list
**, struct linpool
*);
502 int bgp_get_attr(struct eattr
*e
, byte
*buf
, int buflen
);
503 void bgp_get_route_info(struct rte
*, byte
*buf
, struct ea_list
*attrs
);
508 void mrt_dump_bgp_state_change(struct bgp_conn
*conn
, unsigned old
, unsigned new);
509 const struct bgp_af_desc
*bgp_get_af_desc(u32 afi
);
510 const struct bgp_af_caps
*bgp_find_af_caps(struct bgp_caps
*caps
, u32 afi
);
511 void bgp_schedule_packet(struct bgp_conn
*conn
, struct bgp_channel
*c
, int type
);
512 void bgp_kick_tx(void *vconn
);
513 void bgp_tx(struct birdsock
*sk
);
514 int bgp_rx(struct birdsock
*sk
, uint size
);
515 const char * bgp_error_dsc(unsigned code
, unsigned subcode
);
516 void bgp_log_error(struct bgp_proto
*p
, u8
class, char *msg
, unsigned code
, unsigned subcode
, byte
*data
, unsigned len
);
518 void bgp_update_next_hop(struct bgp_export_state
*s
, eattr
*a
, ea_list
**to
);
523 #define PKT_OPEN 0x01
524 #define PKT_UPDATE 0x02
525 #define PKT_NOTIFICATION 0x03
526 #define PKT_KEEPALIVE 0x04
527 #define PKT_ROUTE_REFRESH 0x05 /* [RFC2918] */
528 #define PKT_BEGIN_REFRESH 0x1e /* Dummy type for BoRR packet [RFC7313] */
529 #define PKT_SCHEDULE_CLOSE 0x1f /* Used internally to schedule socket close */
533 #define BAF_OPTIONAL 0x80
534 #define BAF_TRANSITIVE 0x40
535 #define BAF_PARTIAL 0x20
536 #define BAF_EXT_LEN 0x10
538 #define BA_ORIGIN 0x01 /* RFC 4271 */ /* WM */
539 #define BA_AS_PATH 0x02 /* WM */
540 #define BA_NEXT_HOP 0x03 /* WM */
541 #define BA_MULTI_EXIT_DISC 0x04 /* ON */
542 #define BA_LOCAL_PREF 0x05 /* WD */
543 #define BA_ATOMIC_AGGR 0x06 /* WD */
544 #define BA_AGGREGATOR 0x07 /* OT */
545 #define BA_COMMUNITY 0x08 /* RFC 1997 */ /* OT */
546 #define BA_ORIGINATOR_ID 0x09 /* RFC 4456 */ /* ON */
547 #define BA_CLUSTER_LIST 0x0a /* RFC 4456 */ /* ON */
548 #define BA_MP_REACH_NLRI 0x0e /* RFC 4760 */
549 #define BA_MP_UNREACH_NLRI 0x0f /* RFC 4760 */
550 #define BA_EXT_COMMUNITY 0x10 /* RFC 4360 */
551 #define BA_AS4_PATH 0x11 /* RFC 6793 */
552 #define BA_AS4_AGGREGATOR 0x12 /* RFC 6793 */
553 #define BA_LARGE_COMMUNITY 0x20 /* RFC 8092 */
555 /* Bird's private internal BGP attributes */
556 #define BA_MPLS_LABEL_STACK 0xfe /* MPLS label stack transfer attribute */
558 /* BGP connection states */
561 #define BS_CONNECT 1 /* Attempting to connect */
562 #define BS_ACTIVE 2 /* Waiting for connection retry & listening */
563 #define BS_OPENSENT 3
564 #define BS_OPENCONFIRM 4
565 #define BS_ESTABLISHED 5
566 #define BS_CLOSE 6 /* Used during transition to BS_IDLE */
572 * Used in PS_START for fine-grained specification of starting state.
574 * When BGP protocol is started by core, it goes to BSS_PREPARE. When BGP
575 * protocol done what is neccessary to start itself (like acquiring the lock),
576 * it goes to BSS_CONNECT.
579 #define BSS_PREPARE 0 /* Used before ordinary BGP started, i. e. waiting for lock */
580 #define BSS_DELAY 1 /* Startup delay due to previous errors */
581 #define BSS_CONNECT 2 /* Ordinary BGP connecting */
584 /* BGP feed states (TX)
586 * RFC 4724 specifies that an initial feed should end with End-of-RIB mark.
588 * RFC 7313 specifies that a route refresh should be demarcated by BoRR and EoRR packets.
590 * These states (stored in c->feed_state) are used to keep track of these
591 * requirements. When such feed is started, BFS_LOADING / BFS_REFRESHING is
592 * set. When it ended, BFS_LOADED / BFS_REFRESHED is set to schedule End-of-RIB
593 * or EoRR packet. When the packet is sent, the state returned to BFS_NONE.
595 * Note that when a non-demarcated feed (e.g. plain RFC 4271 initial load
596 * without End-of-RIB or plain RFC 2918 route refresh without BoRR/EoRR
597 * demarcation) is active, BFS_NONE is set.
599 * BFS_NONE, BFS_LOADING and BFS_REFRESHING are also used as load states (RX)
600 * with correspondent semantics (-, expecting End-of-RIB, expecting EoRR).
603 #define BFS_NONE 0 /* No feed or original non-demarcated feed */
604 #define BFS_LOADING 1 /* Initial feed active, End-of-RIB planned */
605 #define BFS_LOADED 2 /* Loading done, End-of-RIB marker scheduled */
606 #define BFS_REFRESHING 3 /* Route refresh (introduced by BoRR) active */
607 #define BFS_REFRESHED 4 /* Refresh done, EoRR packet scheduled */
613 #define BE_MISC 1 /* Miscellaneous error */
614 #define BE_SOCKET 2 /* Socket error */
615 #define BE_BGP_RX 3 /* BGP protocol error notification received */
616 #define BE_BGP_TX 4 /* BGP protocol error notification sent */
617 #define BE_AUTO_DOWN 5 /* Automatic shutdown */
618 #define BE_MAN_DOWN 6 /* Manual shutdown */
620 /* Misc error codes */
622 #define BEM_NEIGHBOR_LOST 1
623 #define BEM_INVALID_NEXT_HOP 2
624 #define BEM_INVALID_MD5 3 /* MD5 authentication kernel request failed (possibly not supported) */
625 #define BEM_NO_SOCKET 4
626 #define BEM_LINK_DOWN 5
627 #define BEM_BFD_DOWN 6
628 #define BEM_GRACEFUL_RESTART 7
630 /* Automatic shutdown error codes */
632 #define BEA_ROUTE_LIMIT_EXCEEDED 1
634 /* Well-known communities */
636 #define BGP_COMM_NO_EXPORT 0xffffff01 /* Don't export outside local AS / confed. */
637 #define BGP_COMM_NO_ADVERTISE 0xffffff02 /* Don't export at all */
638 #define BGP_COMM_NO_EXPORT_SUBCONFED 0xffffff03 /* NO_EXPORT even in local confederation */
644 #define ORIGIN_INCOMPLETE 2