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
35 /* Internal AF codes */
37 #define BGP_AF(A, B) (((u32)(A) << 16) | (u32)(B))
38 #define BGP_AFI(A) ((u32)(A) >> 16)
39 #define BGP_SAFI(A) ((u32)(A) & 0xFFFF)
41 #define BGP_AF_IPV4 BGP_AF( BGP_AFI_IPV4, BGP_SAFI_UNICAST )
42 #define BGP_AF_IPV6 BGP_AF( BGP_AFI_IPV6, BGP_SAFI_UNICAST )
43 #define BGP_AF_IPV4_MC BGP_AF( BGP_AFI_IPV4, BGP_SAFI_MULTICAST )
44 #define BGP_AF_IPV6_MC BGP_AF( BGP_AFI_IPV6, BGP_SAFI_MULTICAST )
47 struct bgp_write_state
;
48 struct bgp_parse_state
;
49 struct bgp_export_state
;
56 uint (*encode_nlri
)(struct bgp_write_state
*s
, struct bgp_bucket
*buck
, byte
*buf
, uint size
);
57 void (*decode_nlri
)(struct bgp_parse_state
*s
, byte
*pos
, uint len
, rta
*a
);
58 void (*update_next_hop
)(struct bgp_export_state
*s
, eattr
*nh
, ea_list
**to
);
59 uint (*encode_next_hop
)(struct bgp_write_state
*s
, eattr
*nh
, byte
*buf
, uint size
);
60 void (*decode_next_hop
)(struct bgp_parse_state
*s
, byte
*pos
, uint len
, rta
*a
);
65 struct proto_config c
;
66 u32 local_as
, remote_as
;
67 ip_addr local_ip
; /* Source address to use */
69 struct iface
*iface
; /* Interface for link-local addresses */
70 u16 local_port
; /* Local listening port */
71 u16 remote_port
; /* Neighbor destination port */
72 int multihop
; /* Number of hops if multihop */
73 int strict_bind
; /* Bind listening socket to local address XXXX */
74 int ttl_security
; /* Enable TTL security [RFC 5082] */
75 int compare_path_lengths
; /* Use path lengths when selecting best route */
76 int med_metric
; /* Compare MULTI_EXIT_DISC even between routes from differen ASes */
77 int igp_metric
; /* Use IGP metrics when selecting best route */
78 int prefer_older
; /* Prefer older routes according to RFC 5004 */
79 int deterministic_med
; /* Use more complicated algo to have strict RFC 4271 MED comparison */
80 u32 default_local_pref
; /* Default value for LOCAL_PREF attribute */
81 u32 default_med
; /* Default value for MULTI_EXIT_DISC attribute */
82 int capabilities
; /* Enable capability handshake [RFC 3392] */
83 int enable_refresh
; /* Enable local support for route refresh [RFC 2918] */
84 int enable_as4
; /* Enable local support for 4B AS numbers [RFC 4893] */
85 int enable_extended_messages
; /* Enable local support for extended messages [draft] */
86 u32 rr_cluster_id
; /* Route reflector cluster ID, if different from local ID */
87 int rr_client
; /* Whether neighbor is RR client of me */
88 int rs_client
; /* Whether neighbor is RS client of me */
89 u32 confederation
; /* Confederation ID, or zero if confeds not active */
90 int confederation_member
; /* Whether neighbor AS is member of our confederation */
91 int passive
; /* Do not initiate outgoing connection */
92 int interpret_communities
; /* Hardwired handling of well-known communities */
93 int allow_local_as
; /* Allow that number of local ASNs in incoming AS_PATHs */
94 int gr_mode
; /* Graceful restart mode (BGP_GR_*) */
95 int setkey
; /* Set MD5 password to system SA/SP database */
96 unsigned gr_time
; /* Graceful restart timeout */
97 unsigned connect_delay_time
; /* Minimum delay between connect attempts */
98 unsigned connect_retry_time
; /* Timeout for connect attempts */
99 unsigned hold_time
, initial_hold_time
;
100 unsigned keepalive_time
;
101 unsigned error_amnesia_time
; /* Errors are forgotten after */
102 unsigned error_delay_time_min
; /* Time to wait after an error is detected */
103 unsigned error_delay_time_max
;
104 unsigned disable_after_error
; /* Disable the protocol when error is detected */
106 char *password
; /* Password used for MD5 authentication */
107 int check_link
; /* Use iface link state for liveness detection */
108 int bfd
; /* Use BFD for liveness detection */
111 struct bgp_channel_config
{
112 struct channel_config c
;
116 ip_addr next_hop_addr
; /* Local address for NEXT_HOP attribute */
117 u8 next_hop_self
; /* Always set next hop to local IP address */
118 u8 next_hop_keep
; /* Do not touch next hop attribute */
119 u8 missing_lladdr
; /* What we will do when we don' know link-local addr, see MLL_* */
120 u8 gw_mode
; /* How we compute route gateway from next_hop attr, see GW_* */
121 u8 secondary
; /* Accept also non-best routes (i.e. RA_ACCEPTED) */
122 u8 gr_able
; /* Allow full graceful restart for the channel */
123 u8 add_path
; /* Use ADD-PATH extension [RFC 7911] */
125 struct rtable_config
*igp_table
; /* Table used for recursive next hop lookups */
133 #define GW_RECURSIVE 2
135 #define BGP_ADD_PATH_RX 1
136 #define BGP_ADD_PATH_TX 2
137 #define BGP_ADD_PATH_FULL 3
139 #define BGP_GR_ABLE 1
140 #define BGP_GR_AWARE 2
142 /* For GR capability common flags */
143 #define BGP_GRF_RESTART 0x80
145 /* For GR capability per-AF flags */
146 #define BGP_GRF_FORWARDING 0x80
151 u8 ready
; /* Multiprotocol capability, RFC 4760 */
152 u8 gr_able
; /* Graceful restart support, RFC 4724 */
153 u8 gr_af_flags
; /* Graceful restart per-AF flags */
154 u8 add_path
; /* Multiple paths support, RFC 7911 */
158 u32 as4_number
; /* Announced ASN */
160 u8 as4_support
; /* Four-octet AS capability, RFC 6793 */
161 u8 ext_messages
; /* Extended message length, RFC draft */
162 u8 route_refresh
; /* Route refresh capability, RFC 2918 */
163 u8 enhanced_refresh
; /* Enhanced route refresh, RFC 7313 */
165 u8 gr_aware
; /* Graceful restart capability, RFC 4724 */
166 u8 gr_flags
; /* Graceful restart flags */
167 u16 gr_time
; /* Graceful restart time in seconds */
169 u16 af_count
; /* Number of af_data items */
171 struct bgp_af_caps af_data
[0]; /* Per-AF capability data */
175 node n
; /* Node in global bgp_sockets */
176 sock
*sk
; /* Real listening socket */
177 u32 uc
; /* Use count */
181 struct bgp_proto
*bgp
;
183 u8 state
; /* State of connection state machine */
184 u8 as4_session
; /* Session uses 4B AS numbers in AS_PATH (both sides support it) */
185 u8 ext_messages
; /* Session uses extended message length */
187 struct bgp_caps
*local_caps
;
188 struct bgp_caps
*remote_caps
;
189 struct timer
*connect_timer
;
190 struct timer
*hold_timer
;
191 struct timer
*keepalive_timer
;
193 u32 packets_to_send
; /* Bitmap of packet types to be sent */
194 u32 channels_to_send
; /* Bitmap of channels with packets to be sent */
195 u8 last_channel
; /* Channel used last time for TX */
196 u8 last_channel_count
; /* Number of times the last channel was used in succession */
197 int notify_code
, notify_subcode
, notify_size
;
200 uint hold_time
, keepalive_time
; /* Times calculated from my and neighbor's requirements */
205 struct bgp_config
*cf
; /* Shortcut to BGP configuration */
206 u32 local_as
, remote_as
;
207 u32 public_as
; /* Externally visible ASN (local_as or confederation id) */
208 u32 local_id
; /* BGP identifier of this router */
209 u32 remote_id
; /* BGP identifier of the neighbor */
210 u32 rr_cluster_id
; /* Route reflector cluster ID */
211 int start_state
; /* Substates that partitions BS_START */
212 u8 is_internal
; /* Internal BGP session (local_as == remote_as) */
213 u8 is_interior
; /* Internal or intra-confederation BGP session */
214 u8 as4_session
; /* Session uses 4B AS numbers in AS_PATH (both sides support it) */
215 u8 rr_client
; /* Whether neighbor is RR client of me */
216 u8 rs_client
; /* Whether neighbor is RS client of me */
217 u8 route_refresh
; /* Route refresh allowed to send [RFC 2918] */
218 u8 enhanced_refresh
; /* Enhanced refresh is negotiated [RFC 7313] */
219 u8 gr_ready
; /* Neighbor could do graceful restart */
220 u8 gr_active_num
; /* Neighbor is doing GR, number of active channels */
221 u8 channel_count
; /* Number of active channels */
222 u32
*afi_map
; /* Map channel index -> AFI */
223 struct bgp_channel
**channel_map
; /* Map channel index -> channel */
224 struct bgp_conn
*conn
; /* Connection we have established */
225 struct bgp_conn outgoing_conn
; /* Outgoing connection we're working with */
226 struct bgp_conn incoming_conn
; /* Incoming connection we have neither accepted nor rejected yet */
227 struct object_lock
*lock
; /* Lock for neighbor connection */
228 struct neighbor
*neigh
; /* Neighbor entry corresponding to remote ip, NULL if multihop */
229 struct bgp_socket
*sock
; /* Shared listening socket */
230 struct bfd_request
*bfd_req
; /* BFD request, if BFD is used */
231 ip_addr source_addr
; /* Local address used as an advertised next hop */
232 ip_addr link_addr
; /* Link-local version of source_addr */
233 struct event
*event
; /* Event for respawning and shutting process */
234 struct timer
*startup_timer
; /* Timer used to delay protocol startup due to previous errors (startup_delay) */
235 struct timer
*gr_timer
; /* Timer waiting for reestablishment after graceful restart */
236 unsigned startup_delay
; /* Time to delay protocol startup by due to errors */
237 bird_clock_t last_proto_error
; /* Time of last error that leads to protocol stop */
238 u8 last_error_class
; /* Error class of last error */
239 u32 last_error_code
; /* Error code of last error. BGP protocol errors
240 are encoded as (bgp_err_code << 16 | bgp_err_subcode) */
246 /* Rest are BGP specific data */
247 struct bgp_channel_config
*cf
;
248 pool
*pool
; /* XXXX */
252 const struct bgp_af_desc
*desc
;
254 HASH(struct bgp_bucket
) bucket_hash
; /* Hash table of route buckets */
255 struct bgp_bucket
*withdraw_bucket
; /* Withdrawn routes */
256 list bucket_queue
; /* Queue of buckets to send (struct bgp_bucket) */
258 HASH(struct bgp_prefix
) prefix_hash
; /* Prefixes to be sent */
259 slab
*prefix_slab
; /* Slab holding prefix nodes */
261 rtable
*igp_table
; /* Table used for recursive next hop lookups */
262 ip_addr next_hop_addr
; /* Local address for NEXT_HOP attribute */
263 ip_addr link_addr
; /* Link-local version of next_hop_addr */
265 u32 packets_to_send
; /* Bitmap of packet types to be sent */
267 u8 gr_ready
; /* Neighbor could do GR on this AF */
268 u8 gr_active
; /* Neighbor is doing GR and keeping fwd state */
270 u8 add_path_rx
; /* Session expects receive of ADD-PATH extended NLRI */
271 u8 add_path_tx
; /* Session expects transmit of ADD-PATH extended NLRI */
273 u8 feed_state
; /* Feed state (TX) for EoR, RR packets, see BFS_* */
274 u8 load_state
; /* Load state (RX) for EoR, RR packets, see BFS_* */
278 node buck_node
; /* Node in per-bucket list */
279 struct bgp_prefix
*next
; /* Node in prefix hash table */
286 node send_node
; /* Node in send queue */
287 struct bgp_bucket
*next
; /* Node in bucket hash table */
288 list prefixes
; /* Prefixes in this bucket (struct bgp_prefix) */
289 u32 hash
; /* Hash over extended attributes */
290 ea_list eattrs
[0]; /* Per-bucket extended attributes */
293 struct bgp_export_state
{
294 struct bgp_proto
*proto
;
295 struct bgp_channel
*channel
;
296 struct linpool
*pool
;
298 struct bgp_proto
*src
;
305 struct bgp_write_state
{
306 struct bgp_proto
*proto
;
307 struct bgp_channel
*channel
;
308 struct linpool
*pool
;
316 struct bgp_parse_state
{
317 struct bgp_proto
*proto
;
318 struct bgp_channel
*channel
;
319 struct linpool
*pool
;
324 u32 attrs_seen
[256/32];
332 uint ip_next_hop_len
;
335 uint mp_next_hop_len
;
339 byte
*ip_unreach_nlri
;
340 byte
*ip_next_hop_data
;
342 byte
*mp_unreach_nlri
;
343 byte
*mp_next_hop_data
;
349 /* Cached state for bgp_rte_update() */
351 struct rte_src
*last_src
;
356 #define BGP_VERSION 4
357 #define BGP_HEADER_LENGTH 19
358 #define BGP_MAX_MESSAGE_LENGTH 4096
359 #define BGP_MAX_EXT_MSG_LENGTH 65535
360 #define BGP_RX_BUFFER_SIZE 4096
361 #define BGP_TX_BUFFER_SIZE 4096
362 #define BGP_RX_BUFFER_EXT_SIZE 65535
363 #define BGP_TX_BUFFER_EXT_SIZE 65535
365 static inline int bgp_channel_is_ipv4(struct bgp_channel
*c
)
366 { return BGP_AFI(c
->afi
) == BGP_AFI_IPV4
; }
368 static inline int bgp_channel_is_ipv6(struct bgp_channel
*c
)
369 { return BGP_AFI(c
->afi
) == BGP_AFI_IPV6
; }
371 static inline uint
bgp_max_packet_length(struct bgp_conn
*conn
)
372 { return conn
->ext_messages
? BGP_MAX_EXT_MSG_LENGTH
: BGP_MAX_MESSAGE_LENGTH
; }
375 bgp_parse_error(struct bgp_parse_state
*s
, uint subcode
)
377 s
->err_subcode
= subcode
;
378 longjmp(s
->err_jmpbuf
, 1);
381 extern struct linpool
*bgp_linpool
;
384 void bgp_start_timer(struct timer
*t
, int value
);
385 void bgp_check_config(struct bgp_config
*c
);
386 void bgp_error(struct bgp_conn
*c
, unsigned code
, unsigned subcode
, byte
*data
, int len
);
387 void bgp_close_conn(struct bgp_conn
*c
);
388 void bgp_update_startup_delay(struct bgp_proto
*p
);
389 void bgp_conn_enter_openconfirm_state(struct bgp_conn
*conn
);
390 void bgp_conn_enter_established_state(struct bgp_conn
*conn
);
391 void bgp_conn_enter_close_state(struct bgp_conn
*conn
);
392 void bgp_conn_enter_idle_state(struct bgp_conn
*conn
);
393 void bgp_handle_graceful_restart(struct bgp_proto
*p
);
394 void bgp_graceful_restart_done(struct bgp_channel
*c
);
395 void bgp_refresh_begin(struct bgp_channel
*c
);
396 void bgp_refresh_end(struct bgp_channel
*c
);
397 void bgp_store_error(struct bgp_proto
*p
, struct bgp_conn
*c
, u8
class, u32 code
);
398 void bgp_stop(struct bgp_proto
*p
, unsigned subcode
);
400 struct rte_source
*bgp_find_source(struct bgp_proto
*p
, u32 path_id
);
401 struct rte_source
*bgp_get_source(struct bgp_proto
*p
, u32 path_id
);
406 #define BGP_FORCE_DEBUG 1
408 #define BGP_FORCE_DEBUG 0
410 #define BGP_TRACE(flags, msg, args...) do { if ((p->p.debug & flags) || BGP_FORCE_DEBUG) \
411 log(L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
413 #define BGP_TRACE_RL(rl, flags, msg, args...) do { if ((p->p.debug & flags) || BGP_FORCE_DEBUG) \
414 log_rl(rl, L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
419 static inline eattr
*
420 bgp_find_attr(ea_list
*attrs
, uint code
)
422 return ea_find(attrs
, EA_CODE(EAP_BGP
, code
));
426 bgp_set_attr(ea_list
**attrs
, struct linpool
*pool
, uint code
, uint flags
, uintptr_t val
);
429 bgp_set_attr_u32(ea_list
**to
, struct linpool
*pool
, uint code
, uint flags
, u32 val
)
430 { bgp_set_attr(to
, pool
, code
, flags
, (uintptr_t) val
); }
433 bgp_set_attr_ptr(ea_list
**to
, struct linpool
*pool
, uint code
, uint flags
, struct adata
*val
)
434 { bgp_set_attr(to
, pool
, code
, flags
, (uintptr_t) val
); }
437 bgp_set_attr_data(ea_list
**to
, struct linpool
*pool
, uint code
, uint flags
, void *data
, uint len
)
439 struct adata
*a
= lp_alloc_adata(pool
, len
);
440 memcpy(a
->data
, data
, len
);
441 bgp_set_attr(to
, pool
, code
, flags
, (uintptr_t) a
);
445 bgp_unset_attr(ea_list
**to
, struct linpool
*pool
, uint code
)
446 { eattr
*e
= bgp_set_attr(to
, pool
, code
, 0, 0); e
->type
= EAF_TYPE_UNDEF
; }
451 /* Hack: although BA_NEXT_HOP attribute has type EAF_TYPE_IP_ADDRESS, in IPv6
452 * we store two addesses in it - a global address and a link local address.
455 #define NEXT_HOP_LENGTH (2*sizeof(ip_addr))
456 static inline void set_next_hop(byte
*b
, ip_addr addr
) { ((ip_addr
*) b
)[0] = addr
; ((ip_addr
*) b
)[1] = IPA_NONE
; }
457 #define NEXT_HOP_LENGTH sizeof(ip_addr)
458 static inline void set_next_hop(byte
*b
, ip_addr addr
) { ((ip_addr
*) b
)[0] = addr
; }
461 int bgp_encode_attrs(struct bgp_write_state
*s
, ea_list
*attrs
, byte
*buf
, byte
*end
);
462 ea_list
* bgp_decode_attrs(struct bgp_parse_state
*s
, byte
*data
, uint len
);
464 void bgp_init_bucket_table(struct bgp_channel
*c
);
465 void bgp_free_bucket(struct bgp_channel
*c
, struct bgp_bucket
*b
);
466 void bgp_defer_bucket(struct bgp_channel
*c
, struct bgp_bucket
*b
);
467 void bgp_withdraw_bucket(struct bgp_channel
*c
, struct bgp_bucket
*b
);
469 void bgp_init_prefix_table(struct bgp_channel
*c
);
470 void bgp_free_prefix(struct bgp_channel
*c
, struct bgp_prefix
*bp
);
472 int bgp_rte_better(struct rte
*, struct rte
*);
473 int bgp_rte_mergable(rte
*pri
, rte
*sec
);
474 int bgp_rte_recalculate(rtable
*table
, net
*net
, rte
*new, rte
*old
, rte
*old_best
);
475 void bgp_rt_notify(struct proto
*P
, struct channel
*C
, net
*n
, rte
*new, rte
*old
, ea_list
*attrs
);
476 int bgp_import_control(struct proto
*, struct rte
**, struct ea_list
**, struct linpool
*);
477 int bgp_get_attr(struct eattr
*e
, byte
*buf
, int buflen
);
478 void bgp_get_route_info(struct rte
*, byte
*buf
, struct ea_list
*attrs
);
483 void mrt_dump_bgp_state_change(struct bgp_conn
*conn
, unsigned old
, unsigned new);
484 const struct bgp_af_desc
*bgp_get_af_desc(u32 afi
);
485 const struct bgp_af_caps
*bgp_find_af_caps(struct bgp_caps
*caps
, u32 afi
);
486 void bgp_schedule_packet(struct bgp_conn
*conn
, struct bgp_channel
*c
, int type
);
487 void bgp_kick_tx(void *vconn
);
488 void bgp_tx(struct birdsock
*sk
);
489 int bgp_rx(struct birdsock
*sk
, uint size
);
490 const char * bgp_error_dsc(unsigned code
, unsigned subcode
);
491 void bgp_log_error(struct bgp_proto
*p
, u8
class, char *msg
, unsigned code
, unsigned subcode
, byte
*data
, unsigned len
);
493 void bgp_update_next_hop(struct bgp_export_state
*s
, eattr
*a
, ea_list
**to
);
498 #define PKT_OPEN 0x01
499 #define PKT_UPDATE 0x02
500 #define PKT_NOTIFICATION 0x03
501 #define PKT_KEEPALIVE 0x04
502 #define PKT_ROUTE_REFRESH 0x05 /* [RFC2918] */
503 #define PKT_BEGIN_REFRESH 0x1e /* Dummy type for BoRR packet [RFC7313] */
504 #define PKT_SCHEDULE_CLOSE 0x1f /* Used internally to schedule socket close */
508 #define BAF_OPTIONAL 0x80
509 #define BAF_TRANSITIVE 0x40
510 #define BAF_PARTIAL 0x20
511 #define BAF_EXT_LEN 0x10
513 #define BA_ORIGIN 0x01 /* [RFC1771] */ /* WM */
514 #define BA_AS_PATH 0x02 /* WM */
515 #define BA_NEXT_HOP 0x03 /* WM */
516 #define BA_MULTI_EXIT_DISC 0x04 /* ON */
517 #define BA_LOCAL_PREF 0x05 /* WD */
518 #define BA_ATOMIC_AGGR 0x06 /* WD */
519 #define BA_AGGREGATOR 0x07 /* OT */
520 #define BA_COMMUNITY 0x08 /* [RFC1997] */ /* OT */
521 #define BA_ORIGINATOR_ID 0x09 /* [RFC1966] */ /* ON */
522 #define BA_CLUSTER_LIST 0x0a /* ON */
523 /* We don't support these: */
524 #define BA_DPA 0x0b /* ??? */
525 #define BA_ADVERTISER 0x0c /* [RFC1863] */
526 #define BA_RCID_PATH 0x0d
527 #define BA_MP_REACH_NLRI 0x0e /* [RFC2283] */
528 #define BA_MP_UNREACH_NLRI 0x0f
529 #define BA_EXT_COMMUNITY 0x10 /* RFC 4360 */
530 #define BA_AS4_PATH 0x11 /* RFC 6793 */
531 #define BA_AS4_AGGREGATOR 0x12 /* RFC 6793 */
532 #define BA_LARGE_COMMUNITY 0x20 /* [draft-ietf-idr-large-community] */
534 /* BGP connection states */
537 #define BS_CONNECT 1 /* Attempting to connect */
538 #define BS_ACTIVE 2 /* Waiting for connection retry & listening */
539 #define BS_OPENSENT 3
540 #define BS_OPENCONFIRM 4
541 #define BS_ESTABLISHED 5
542 #define BS_CLOSE 6 /* Used during transition to BS_IDLE */
548 * Used in PS_START for fine-grained specification of starting state.
550 * When BGP protocol is started by core, it goes to BSS_PREPARE. When BGP
551 * protocol done what is neccessary to start itself (like acquiring the lock),
552 * it goes to BSS_CONNECT.
555 #define BSS_PREPARE 0 /* Used before ordinary BGP started, i. e. waiting for lock */
556 #define BSS_DELAY 1 /* Startup delay due to previous errors */
557 #define BSS_CONNECT 2 /* Ordinary BGP connecting */
560 /* BGP feed states (TX)
562 * RFC 4724 specifies that an initial feed should end with End-of-RIB mark.
564 * RFC 7313 specifies that a route refresh should be demarcated by BoRR and EoRR packets.
566 * These states (stored in c->feed_state) are used to keep track of these
567 * requirements. When such feed is started, BFS_LOADING / BFS_REFRESHING is
568 * set. When it ended, BFS_LOADED / BFS_REFRESHED is set to schedule End-of-RIB
569 * or EoRR packet. When the packet is sent, the state returned to BFS_NONE.
571 * Note that when a non-demarcated feed (e.g. plain RFC 4271 initial load
572 * without End-of-RIB or plain RFC 2918 route refresh without BoRR/EoRR
573 * demarcation) is active, BFS_NONE is set.
575 * BFS_NONE, BFS_LOADING and BFS_REFRESHING are also used as load states (RX)
576 * with correspondent semantics (-, expecting End-of-RIB, expecting EoRR).
579 #define BFS_NONE 0 /* No feed or original non-demarcated feed */
580 #define BFS_LOADING 1 /* Initial feed active, End-of-RIB planned */
581 #define BFS_LOADED 2 /* Loading done, End-of-RIB marker scheduled */
582 #define BFS_REFRESHING 3 /* Route refresh (introduced by BoRR) active */
583 #define BFS_REFRESHED 4 /* Refresh done, EoRR packet scheduled */
589 #define BE_MISC 1 /* Miscellaneous error */
590 #define BE_SOCKET 2 /* Socket error */
591 #define BE_BGP_RX 3 /* BGP protocol error notification received */
592 #define BE_BGP_TX 4 /* BGP protocol error notification sent */
593 #define BE_AUTO_DOWN 5 /* Automatic shutdown */
594 #define BE_MAN_DOWN 6 /* Manual shutdown */
596 /* Misc error codes */
598 #define BEM_NEIGHBOR_LOST 1
599 #define BEM_INVALID_NEXT_HOP 2
600 #define BEM_INVALID_MD5 3 /* MD5 authentication kernel request failed (possibly not supported) */
601 #define BEM_NO_SOCKET 4
602 #define BEM_LINK_DOWN 5
603 #define BEM_BFD_DOWN 6
604 #define BEM_GRACEFUL_RESTART 7
606 /* Automatic shutdown error codes */
608 #define BEA_ROUTE_LIMIT_EXCEEDED 1
610 /* Well-known communities */
612 #define BGP_COMM_NO_EXPORT 0xffffff01 /* Don't export outside local AS / confed. */
613 #define BGP_COMM_NO_ADVERTISE 0xffffff02 /* Don't export at all */
614 #define BGP_COMM_NO_EXPORT_SUBCONFED 0xffffff03 /* NO_EXPORT even in local confederation */
620 #define ORIGIN_INCOMPLETE 2