* BIRD -- The Border Gateway Protocol
*
* (c) 2000 Martin Mares <mj@ucw.cz>
+ * (c) 2008--2016 Ondrej Zajicek <santiago@crfreenet.org>
+ * (c) 2008--2016 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#define _BIRD_BGP_H_
#include <stdint.h>
+#include <setjmp.h>
+#include "nest/bird.h"
#include "nest/route.h"
#include "nest/bfd.h"
+//#include "lib/lists.h"
#include "lib/hash.h"
+#include "lib/socket.h"
struct linpool;
struct eattr;
+
+/* Address families */
+
+#define BGP_AFI_IPV4 1
+#define BGP_AFI_IPV6 2
+
+#define BGP_SAFI_UNICAST 1
+#define BGP_SAFI_MULTICAST 2
+#define BGP_SAFI_MPLS 4
+#define BGP_SAFI_MPLS_VPN 128
+#define BGP_SAFI_VPN_MULTICAST 129
+#define BGP_SAFI_FLOW 133
+
+/* Internal AF codes */
+
+#define BGP_AF(A, B) (((u32)(A) << 16) | (u32)(B))
+#define BGP_AFI(A) ((u32)(A) >> 16)
+#define BGP_SAFI(A) ((u32)(A) & 0xFFFF)
+
+#define BGP_AF_IPV4 BGP_AF( BGP_AFI_IPV4, BGP_SAFI_UNICAST )
+#define BGP_AF_IPV6 BGP_AF( BGP_AFI_IPV6, BGP_SAFI_UNICAST )
+#define BGP_AF_IPV4_MC BGP_AF( BGP_AFI_IPV4, BGP_SAFI_MULTICAST )
+#define BGP_AF_IPV6_MC BGP_AF( BGP_AFI_IPV6, BGP_SAFI_MULTICAST )
+#define BGP_AF_IPV4_MPLS BGP_AF( BGP_AFI_IPV4, BGP_SAFI_MPLS )
+#define BGP_AF_IPV6_MPLS BGP_AF( BGP_AFI_IPV6, BGP_SAFI_MPLS )
+#define BGP_AF_VPN4_MPLS BGP_AF( BGP_AFI_IPV4, BGP_SAFI_MPLS_VPN )
+#define BGP_AF_VPN6_MPLS BGP_AF( BGP_AFI_IPV6, BGP_SAFI_MPLS_VPN )
+#define BGP_AF_VPN4_MC BGP_AF( BGP_AFI_IPV4, BGP_SAFI_VPN_MULTICAST )
+#define BGP_AF_VPN6_MC BGP_AF( BGP_AFI_IPV6, BGP_SAFI_VPN_MULTICAST )
+#define BGP_AF_FLOW4 BGP_AF( BGP_AFI_IPV4, BGP_SAFI_FLOW )
+#define BGP_AF_FLOW6 BGP_AF( BGP_AFI_IPV6, BGP_SAFI_FLOW )
+
+
+struct bgp_write_state;
+struct bgp_parse_state;
+struct bgp_export_state;
+struct bgp_bucket;
+
+struct bgp_af_desc {
+ u32 afi;
+ u32 net;
+ u8 mpls;
+ u8 no_igp;
+ const char *name;
+ uint (*encode_nlri)(struct bgp_write_state *s, struct bgp_bucket *buck, byte *buf, uint size);
+ void (*decode_nlri)(struct bgp_parse_state *s, byte *pos, uint len, rta *a);
+ void (*update_next_hop)(struct bgp_export_state *s, eattr *nh, ea_list **to);
+ uint (*encode_next_hop)(struct bgp_write_state *s, eattr *nh, byte *buf, uint size);
+ void (*decode_next_hop)(struct bgp_parse_state *s, byte *pos, uint len, rta *a);
+};
+
+
struct bgp_config {
struct proto_config c;
u32 local_as, remote_as;
+ ip_addr local_ip; /* Source address to use */
ip_addr remote_ip;
- ip_addr source_addr; /* Source address to use */
struct iface *iface; /* Interface for link-local addresses */
+ u16 local_port; /* Local listening port */
u16 remote_port; /* Neighbor destination port */
+ int peer_type; /* Internal or external BGP (BGP_PT_*, optional) */
int multihop; /* Number of hops if multihop */
- int ttl_security; /* Enable TTL security [RFC5082] */
- int next_hop_self; /* Always set next hop to local IP address */
- int next_hop_keep; /* Do not touch next hop attribute */
- int missing_lladdr; /* What we will do when we don' know link-local addr, see MLL_* */
- int gw_mode; /* How we compute route gateway from next_hop attr, see GW_* */
+ int strict_bind; /* Bind listening socket to local address */
+ int ttl_security; /* Enable TTL security [RFC 5082] */
int compare_path_lengths; /* Use path lengths when selecting best route */
int med_metric; /* Compare MULTI_EXIT_DISC even between routes from differen ASes */
int igp_metric; /* Use IGP metrics when selecting best route */
int deterministic_med; /* Use more complicated algo to have strict RFC 4271 MED comparison */
u32 default_local_pref; /* Default value for LOCAL_PREF attribute */
u32 default_med; /* Default value for MULTI_EXIT_DISC attribute */
- int capabilities; /* Enable capability handshake [RFC3392] */
- int enable_refresh; /* Enable local support for route refresh [RFC2918] */
- int enable_as4; /* Enable local support for 4B AS numbers [RFC4893] */
+ int capabilities; /* Enable capability handshake [RFC 5492] */
+ int enable_refresh; /* Enable local support for route refresh [RFC 2918] */
+ int enable_as4; /* Enable local support for 4B AS numbers [RFC 6793] */
+ int enable_extended_messages; /* Enable local support for extended messages [draft] */
u32 rr_cluster_id; /* Route reflector cluster ID, if different from local ID */
int rr_client; /* Whether neighbor is RR client of me */
int rs_client; /* Whether neighbor is RS client of me */
- int advertise_ipv4; /* Whether we should add IPv4 capability advertisement to OPEN message */
+ u32 confederation; /* Confederation ID, or zero if confeds not active */
+ int confederation_member; /* Whether neighbor AS is member of our confederation */
int passive; /* Do not initiate outgoing connection */
int interpret_communities; /* Hardwired handling of well-known communities */
- int secondary; /* Accept also non-best routes (i.e. RA_ACCEPTED) */
- int add_path; /* Use ADD-PATH extension [draft] */
int allow_local_as; /* Allow that number of local ASNs in incoming AS_PATHs */
+ int allow_local_pref; /* Allow LOCAL_PREF in EBGP sessions */
int gr_mode; /* Graceful restart mode (BGP_GR_*) */
+ int llgr_mode; /* Long-lived graceful restart mode (BGP_LLGR_*) */
+ int setkey; /* Set MD5 password to system SA/SP database */
+ /* Times below are in seconds */
unsigned gr_time; /* Graceful restart timeout */
+ unsigned llgr_time; /* Long-lived graceful restart stale time */
unsigned connect_delay_time; /* Minimum delay between connect attempts */
unsigned connect_retry_time; /* Timeout for connect attempts */
unsigned hold_time, initial_hold_time;
unsigned error_delay_time_min; /* Time to wait after an error is detected */
unsigned error_delay_time_max;
unsigned disable_after_error; /* Disable the protocol when error is detected */
+ u32 disable_after_cease; /* Disable it when cease is received, bitfield */
char *password; /* Password used for MD5 authentication */
- struct rtable_config *igp_table; /* Table used for recursive next hop lookups */
+ net_addr *remote_range; /* Allowed neighbor range for dynamic BGP */
+ char *dynamic_name; /* Name pattern for dynamic BGP */
+ int dynamic_name_digits; /* Minimum number of digits for dynamic names */
int check_link; /* Use iface link state for liveness detection */
int bfd; /* Use BFD for liveness detection */
};
-#define MLL_SELF 1
-#define MLL_DROP 2
-#define MLL_IGNORE 3
+struct bgp_channel_config {
+ struct channel_config c;
+
+ u32 afi;
+ const struct bgp_af_desc *desc;
+
+ ip_addr next_hop_addr; /* Local address for NEXT_HOP attribute */
+ u8 next_hop_self; /* Always set next hop to local IP address (NH_*) */
+ u8 next_hop_keep; /* Do not modify next hop attribute (NH_*) */
+ u8 mandatory; /* Channel is mandatory in capability negotiation */
+ u8 missing_lladdr; /* What we will do when we don' know link-local addr, see MLL_* */
+ u8 gw_mode; /* How we compute route gateway from next_hop attr, see GW_* */
+ u8 secondary; /* Accept also non-best routes (i.e. RA_ACCEPTED) */
+ u8 gr_able; /* Allow full graceful restart for the channel */
+ u8 llgr_able; /* Allow full long-lived GR for the channel */
+ uint llgr_time; /* Long-lived graceful restart stale time */
+ u8 ext_next_hop; /* Allow both IPv4 and IPv6 next hops */
+ u8 add_path; /* Use ADD-PATH extension [RFC 7911] */
+ u8 import_table; /* Use c.in_table as Adj-RIB-In */
+
+ uint rest[0]; /* Remaining items are reconfigured separately */
+ struct rtable_config *igp_table_ip4; /* Table for recursive IPv4 next hop lookups */
+ struct rtable_config *igp_table_ip6; /* Table for recursive IPv6 next hop lookups */
+};
-#define GW_DIRECT 1
-#define GW_RECURSIVE 2
+#define BGP_PT_INTERNAL 1
+#define BGP_PT_EXTERNAL 2
-#define ADD_PATH_RX 1
-#define ADD_PATH_TX 2
-#define ADD_PATH_FULL 3
+#define NH_NO 0
+#define NH_ALL 1
+#define NH_IBGP 2
+#define NH_EBGP 3
-#define BGP_GR_ABLE 1
-#define BGP_GR_AWARE 2
+#define MLL_SELF 1
+#define MLL_DROP 2
+#define MLL_IGNORE 3
-/* For peer_gr_flags */
+#define GW_DIRECT 1
+#define GW_RECURSIVE 2
+
+#define BGP_ADD_PATH_RX 1
+#define BGP_ADD_PATH_TX 2
+#define BGP_ADD_PATH_FULL 3
+
+#define BGP_GR_ABLE 1
+#define BGP_GR_AWARE 2
+
+/* For GR capability common flags */
#define BGP_GRF_RESTART 0x80
-/* For peer_gr_aflags */
+/* For GR capability per-AF flags */
#define BGP_GRF_FORWARDING 0x80
+#define BGP_LLGR_ABLE 1
+#define BGP_LLGR_AWARE 2
+
+#define BGP_LLGRF_FORWARDING 0x80
+
+#define BGP_GRS_NONE 0 /* No GR */
+#define BGP_GRS_ACTIVE 1 /* Graceful restart per RFC 4724 */
+#define BGP_GRS_LLGR 2 /* Long-lived GR phase (stale timer active) */
+
+#define BGP_BFD_GRACEFUL 2 /* BFD down triggers graceful restart */
+
+
+struct bgp_af_caps {
+ u32 afi;
+ u8 ready; /* Multiprotocol capability, RFC 4760 */
+ u8 gr_able; /* Graceful restart support, RFC 4724 */
+ u8 gr_af_flags; /* Graceful restart per-AF flags */
+ u8 llgr_able; /* Long-lived GR, RFC draft */
+ u32 llgr_time; /* Long-lived GR stale time */
+ u8 llgr_flags; /* Long-lived GR per-AF flags */
+ u8 ext_next_hop; /* Extended IPv6 next hop, RFC 5549 */
+ u8 add_path; /* Multiple paths support, RFC 7911 */
+};
+
+struct bgp_caps {
+ u32 as4_number; /* Announced ASN */
+
+ u8 as4_support; /* Four-octet AS capability, RFC 6793 */
+ u8 ext_messages; /* Extended message length, RFC draft */
+ u8 route_refresh; /* Route refresh capability, RFC 2918 */
+ u8 enhanced_refresh; /* Enhanced route refresh, RFC 7313 */
+
+ u8 gr_aware; /* Graceful restart capability, RFC 4724 */
+ u8 gr_flags; /* Graceful restart flags */
+ u16 gr_time; /* Graceful restart time in seconds */
+
+ u8 llgr_aware; /* Long-lived GR capability, RFC draft */
+ u8 any_ext_next_hop; /* Bitwise OR of per-AF ext_next_hop */
+ u8 any_add_path; /* Bitwise OR of per-AF add_path */
+
+ u16 af_count; /* Number of af_data items */
+ u16 length; /* Length of capabilities in OPEN msg */
+
+ struct bgp_af_caps af_data[0]; /* Per-AF capability data */
+};
+
+#define WALK_AF_CAPS(caps,ac) \
+ for (ac = caps->af_data; ac < &caps->af_data[caps->af_count]; ac++)
+
+
+struct bgp_socket {
+ node n; /* Node in global bgp_sockets */
+ sock *sk; /* Real listening socket */
+ u32 uc; /* Use count */
+};
struct bgp_conn {
struct bgp_proto *bgp;
struct birdsock *sk;
- uint state; /* State of connection state machine */
- struct timer *connect_retry_timer;
- struct timer *hold_timer;
- struct timer *keepalive_timer;
- struct event *tx_ev;
- int packets_to_send; /* Bitmap of packet types to be sent */
+ u8 state; /* State of connection state machine */
+ u8 as4_session; /* Session uses 4B AS numbers in AS_PATH (both sides support it) */
+ u8 ext_messages; /* Session uses extended message length */
+ u32 received_as; /* ASN received in OPEN message */
+
+ struct bgp_caps *local_caps;
+ struct bgp_caps *remote_caps;
+ timer *connect_timer;
+ timer *hold_timer;
+ timer *keepalive_timer;
+ event *tx_ev;
+ u32 packets_to_send; /* Bitmap of packet types to be sent */
+ u32 channels_to_send; /* Bitmap of channels with packets to be sent */
+ u8 last_channel; /* Channel used last time for TX */
+ u8 last_channel_count; /* Number of times the last channel was used in succession */
int notify_code, notify_subcode, notify_size;
byte *notify_data;
- u32 advertised_as; /* Temporary value for AS number received */
- int start_state; /* protocol start_state snapshot when connection established */
- u8 peer_refresh_support; /* Peer supports route refresh [RFC2918] */
- u8 peer_as4_support; /* Peer supports 4B AS numbers [RFC4893] */
- u8 peer_add_path; /* Peer supports ADD-PATH [draft] */
- u8 peer_enhanced_refresh_support; /* Peer supports enhanced refresh [RFC7313] */
- u8 peer_gr_aware;
- u8 peer_gr_able;
- u16 peer_gr_time;
- u8 peer_gr_flags;
- u8 peer_gr_aflags;
- unsigned hold_time, keepalive_time; /* Times calculated from my and neighbor's requirements */
+
+ uint hold_time, keepalive_time; /* Times calculated from my and neighbor's requirements */
};
struct bgp_proto {
struct proto p;
- struct bgp_config *cf; /* Shortcut to BGP configuration */
+ const struct bgp_config *cf; /* Shortcut to BGP configuration */
+ ip_addr local_ip, remote_ip;
u32 local_as, remote_as;
- int start_state; /* Substates that partitions BS_START */
- u8 is_internal; /* Internal BGP connection (local_as == remote_as) */
- u8 as4_session; /* Session uses 4B AS numbers in AS_PATH (both sides support it) */
- u8 add_path_rx; /* Session expects receive of ADD-PATH extended NLRI */
- u8 add_path_tx; /* Session expects transmit of ADD-PATH extended NLRI */
+ u32 public_as; /* Externally visible ASN (local_as or confederation id) */
u32 local_id; /* BGP identifier of this router */
u32 remote_id; /* BGP identifier of the neighbor */
u32 rr_cluster_id; /* Route reflector cluster ID */
- int rr_client; /* Whether neighbor is RR client of me */
- int rs_client; /* Whether neighbor is RS client of me */
+ u8 start_state; /* Substates that partitions BS_START */
+ u8 is_internal; /* Internal BGP session (local_as == remote_as) */
+ u8 is_interior; /* Internal or intra-confederation BGP session */
+ u8 as4_session; /* Session uses 4B AS numbers in AS_PATH (both sides support it) */
+ u8 rr_client; /* Whether neighbor is RR client of me */
+ u8 rs_client; /* Whether neighbor is RS client of me */
+ u8 ipv4; /* Use IPv4 connection, i.e. remote_ip is IPv4 */
+ u8 passive; /* Do not initiate outgoing connection */
+ u8 route_refresh; /* Route refresh allowed to send [RFC 2918] */
+ u8 enhanced_refresh; /* Enhanced refresh is negotiated [RFC 7313] */
u8 gr_ready; /* Neighbor could do graceful restart */
- u8 gr_active; /* Neighbor is doing graceful restart */
- u8 feed_state; /* Feed state (TX) for EoR, RR packets, see BFS_* */
- u8 load_state; /* Load state (RX) for EoR, RR packets, see BFS_* */
+ u8 llgr_ready; /* Neighbor could do Long-lived GR, implies gr_ready */
+ u8 gr_active_num; /* Neighbor is doing GR, number of active channels */
+ u8 channel_count; /* Number of active channels */
+ u8 summary_add_path_rx; /* Summary state of ADD_PATH RX w.r.t active channels */
+ u32 *afi_map; /* Map channel index -> AFI */
+ struct bgp_channel **channel_map; /* Map channel index -> channel */
struct bgp_conn *conn; /* Connection we have established */
struct bgp_conn outgoing_conn; /* Outgoing connection we're working with */
struct bgp_conn incoming_conn; /* Incoming connection we have neither accepted nor rejected yet */
struct object_lock *lock; /* Lock for neighbor connection */
struct neighbor *neigh; /* Neighbor entry corresponding to remote ip, NULL if multihop */
+ struct bgp_socket *sock; /* Shared listening socket */
struct bfd_request *bfd_req; /* BFD request, if BFD is used */
- ip_addr source_addr; /* Local address used as an advertised next hop */
- rtable *igp_table; /* Table used for recursive next hop lookups */
- struct event *event; /* Event for respawning and shutting process */
- struct timer *startup_timer; /* Timer used to delay protocol startup due to previous errors (startup_delay) */
- struct timer *gr_timer; /* Timer waiting for reestablishment after graceful restart */
- struct bgp_bucket **bucket_hash; /* Hash table of attribute buckets */
- uint hash_size, hash_count, hash_limit;
- HASH(struct bgp_prefix) prefix_hash; /* Prefixes to be sent */
- slab *prefix_slab; /* Slab holding prefix nodes */
- list bucket_queue; /* Queue of buckets to send */
- struct bgp_bucket *withdraw_bucket; /* Withdrawn routes */
- unsigned startup_delay; /* Time to delay protocol startup by due to errors */
- bird_clock_t last_proto_error; /* Time of last error that leads to protocol stop */
+ struct birdsock *postponed_sk; /* Postponed incoming socket for dynamic BGP */
+ ip_addr link_addr; /* Link-local version of local_ip */
+ event *event; /* Event for respawning and shutting process */
+ timer *startup_timer; /* Timer used to delay protocol startup due to previous errors (startup_delay) */
+ timer *gr_timer; /* Timer waiting for reestablishment after graceful restart */
+ int dynamic_name_counter; /* Counter for dynamic BGP names */
+ uint startup_delay; /* Delay (in seconds) of protocol startup due to previous errors */
+ btime last_proto_error; /* Time of last error that leads to protocol stop */
u8 last_error_class; /* Error class of last error */
u32 last_error_code; /* Error code of last error. BGP protocol errors
are encoded as (bgp_err_code << 16 | bgp_err_subcode) */
-#ifdef IPV6
- byte *mp_reach_start, *mp_unreach_start; /* Multiprotocol BGP attribute notes */
- unsigned mp_reach_len, mp_unreach_len;
- ip_addr local_link; /* Link-level version of source_addr */
-#endif
+};
+
+struct bgp_channel {
+ struct channel c;
+
+ /* Rest are BGP specific data */
+ struct bgp_channel_config *cf;
+
+ u32 afi;
+ u32 index;
+ const struct bgp_af_desc *desc;
+
+ rtable *igp_table_ip4; /* Table for recursive IPv4 next hop lookups */
+ rtable *igp_table_ip6; /* Table for recursive IPv6 next hop lookups */
+
+ /* Rest are zeroed when down */
+ pool *pool;
+ HASH(struct bgp_bucket) bucket_hash; /* Hash table of route buckets */
+ struct bgp_bucket *withdraw_bucket; /* Withdrawn routes */
+ list bucket_queue; /* Queue of buckets to send (struct bgp_bucket) */
+
+ HASH(struct bgp_prefix) prefix_hash; /* Prefixes to be sent */
+ slab *prefix_slab; /* Slab holding prefix nodes */
+
+ ip_addr next_hop_addr; /* Local address for NEXT_HOP attribute */
+ ip_addr link_addr; /* Link-local version of next_hop_addr */
+
+ u32 packets_to_send; /* Bitmap of packet types to be sent */
+
+ u8 ext_next_hop; /* Session allows both IPv4 and IPv6 next hops */
+
+ u8 gr_ready; /* Neighbor could do GR on this AF */
+ u8 gr_active; /* Neighbor is doing GR (BGP_GRS_*) */
+
+ timer *stale_timer; /* Long-lived stale timer for LLGR */
+ u32 stale_time; /* Stored LLGR stale time from last session */
+
+ u8 add_path_rx; /* Session expects receive of ADD-PATH extended NLRI */
+ u8 add_path_tx; /* Session expects transmit of ADD-PATH extended NLRI */
+
+ u8 feed_state; /* Feed state (TX) for EoR, RR packets, see BFS_* */
+ u8 load_state; /* Load state (RX) for EoR, RR packets, see BFS_* */
};
struct bgp_prefix {
- struct {
- ip_addr prefix;
- int pxlen;
- } n;
+ node buck_node; /* Node in per-bucket list */
+ struct bgp_prefix *next; /* Node in prefix hash table */
+ u32 hash;
u32 path_id;
- struct bgp_prefix *next;
- node bucket_node; /* Node in per-bucket list */
+ net_addr net[0];
};
struct bgp_bucket {
node send_node; /* Node in send queue */
- struct bgp_bucket *hash_next, *hash_prev; /* Node in bucket hash table */
- unsigned hash; /* Hash over extended attributes */
- list prefixes; /* Prefixes in this buckets */
+ struct bgp_bucket *next; /* Node in bucket hash table */
+ list prefixes; /* Prefixes in this bucket (struct bgp_prefix) */
+ u32 hash; /* Hash over extended attributes */
ea_list eattrs[0]; /* Per-bucket extended attributes */
};
+struct bgp_export_state {
+ struct bgp_proto *proto;
+ struct bgp_channel *channel;
+ struct linpool *pool;
+
+ struct bgp_proto *src;
+ rte *route;
+ int mpls;
+
+ u32 attrs_seen[1];
+ uint err_withdraw;
+};
+
+struct bgp_write_state {
+ struct bgp_proto *proto;
+ struct bgp_channel *channel;
+ struct linpool *pool;
+
+ int mp_reach;
+ int as4_session;
+ int add_path;
+ int mpls;
+
+ eattr *mp_next_hop;
+ const adata *mpls_labels;
+};
+
+struct bgp_parse_state {
+ struct bgp_proto *proto;
+ struct bgp_channel *channel;
+ struct linpool *pool;
+
+ int as4_session;
+ int add_path;
+ int mpls;
+
+ u32 attrs_seen[256/32];
+
+ u32 mp_reach_af;
+ u32 mp_unreach_af;
+
+ uint attr_len;
+ uint ip_reach_len;
+ uint ip_unreach_len;
+ uint ip_next_hop_len;
+ uint mp_reach_len;
+ uint mp_unreach_len;
+ uint mp_next_hop_len;
+
+ byte *attrs;
+ byte *ip_reach_nlri;
+ byte *ip_unreach_nlri;
+ byte *ip_next_hop_data;
+ byte *mp_reach_nlri;
+ byte *mp_unreach_nlri;
+ byte *mp_next_hop_data;
+
+ uint err_withdraw;
+ uint err_subcode;
+ jmp_buf err_jmpbuf;
+
+ struct hostentry *hostentry;
+ adata *mpls_labels;
+
+ /* Cached state for bgp_rte_update() */
+ u32 last_id;
+ struct rte_src *last_src;
+ rta *cached_rta;
+};
+
#define BGP_PORT 179
#define BGP_VERSION 4
#define BGP_HEADER_LENGTH 19
-#define BGP_MAX_PACKET_LENGTH 4096
+#define BGP_MAX_MESSAGE_LENGTH 4096
+#define BGP_MAX_EXT_MSG_LENGTH 65535
#define BGP_RX_BUFFER_SIZE 4096
-#define BGP_TX_BUFFER_SIZE BGP_MAX_PACKET_LENGTH
+#define BGP_TX_BUFFER_SIZE 4096
+#define BGP_RX_BUFFER_EXT_SIZE 65535
+#define BGP_TX_BUFFER_EXT_SIZE 65535
+
+static inline int bgp_channel_is_ipv4(struct bgp_channel *c)
+{ return BGP_AFI(c->afi) == BGP_AFI_IPV4; }
+
+static inline int bgp_channel_is_ipv6(struct bgp_channel *c)
+{ return BGP_AFI(c->afi) == BGP_AFI_IPV6; }
+
+static inline int bgp_cc_is_ipv4(struct bgp_channel_config *c)
+{ return BGP_AFI(c->afi) == BGP_AFI_IPV4; }
+
+static inline int bgp_cc_is_ipv6(struct bgp_channel_config *c)
+{ return BGP_AFI(c->afi) == BGP_AFI_IPV6; }
+
+static inline uint bgp_max_packet_length(struct bgp_conn *conn)
+{ return conn->ext_messages ? BGP_MAX_EXT_MSG_LENGTH : BGP_MAX_MESSAGE_LENGTH; }
+
+static inline void
+bgp_parse_error(struct bgp_parse_state *s, uint subcode)
+{
+ s->err_subcode = subcode;
+ longjmp(s->err_jmpbuf, 1);
+}
extern struct linpool *bgp_linpool;
+extern struct linpool *bgp_linpool2;
-void bgp_start_timer(struct timer *t, int value);
+void bgp_start_timer(timer *t, uint value);
void bgp_check_config(struct bgp_config *c);
void bgp_error(struct bgp_conn *c, unsigned code, unsigned subcode, byte *data, int len);
void bgp_close_conn(struct bgp_conn *c);
void bgp_conn_enter_close_state(struct bgp_conn *conn);
void bgp_conn_enter_idle_state(struct bgp_conn *conn);
void bgp_handle_graceful_restart(struct bgp_proto *p);
-void bgp_graceful_restart_done(struct bgp_proto *p);
-void bgp_refresh_begin(struct bgp_proto *p);
-void bgp_refresh_end(struct bgp_proto *p);
+void bgp_graceful_restart_done(struct bgp_channel *c);
+void bgp_refresh_begin(struct bgp_channel *c);
+void bgp_refresh_end(struct bgp_channel *c);
void bgp_store_error(struct bgp_proto *p, struct bgp_conn *c, u8 class, u32 code);
-void bgp_stop(struct bgp_proto *p, unsigned subcode);
+void bgp_stop(struct bgp_proto *p, int subcode, byte *data, uint len);
struct rte_source *bgp_find_source(struct bgp_proto *p, u32 path_id);
struct rte_source *bgp_get_source(struct bgp_proto *p, u32 path_id);
/* attrs.c */
-/* Hack: although BA_NEXT_HOP attribute has type EAF_TYPE_IP_ADDRESS, in IPv6
- * we store two addesses in it - a global address and a link local address.
- */
-#ifdef IPV6
-#define NEXT_HOP_LENGTH (2*sizeof(ip_addr))
-static inline void set_next_hop(byte *b, ip_addr addr) { ((ip_addr *) b)[0] = addr; ((ip_addr *) b)[1] = IPA_NONE; }
-#else
-#define NEXT_HOP_LENGTH sizeof(ip_addr)
-static inline void set_next_hop(byte *b, ip_addr addr) { ((ip_addr *) b)[0] = addr; }
-#endif
+static inline eattr *
+bgp_find_attr(ea_list *attrs, uint code)
+{
+ return ea_find(attrs, EA_CODE(PROTOCOL_BGP, code));
+}
+
+eattr *
+bgp_set_attr(ea_list **attrs, struct linpool *pool, uint code, uint flags, uintptr_t val);
+
+static inline void
+bgp_set_attr_u32(ea_list **to, struct linpool *pool, uint code, uint flags, u32 val)
+{ bgp_set_attr(to, pool, code, flags, (uintptr_t) val); }
+
+static inline void
+bgp_set_attr_ptr(ea_list **to, struct linpool *pool, uint code, uint flags, const struct adata *val)
+{ bgp_set_attr(to, pool, code, flags, (uintptr_t) val); }
+
+static inline void
+bgp_set_attr_data(ea_list **to, struct linpool *pool, uint code, uint flags, void *data, uint len)
+{
+ struct adata *a = lp_alloc_adata(pool, len);
+ memcpy(a->data, data, len);
+ bgp_set_attr(to, pool, code, flags, (uintptr_t) a);
+}
+
+static inline void
+bgp_unset_attr(ea_list **to, struct linpool *pool, uint code)
+{ eattr *e = bgp_set_attr(to, pool, code, 0, 0); e->type = EAF_TYPE_UNDEF; }
+
+
+int bgp_encode_attrs(struct bgp_write_state *s, ea_list *attrs, byte *buf, byte *end);
+ea_list * bgp_decode_attrs(struct bgp_parse_state *s, byte *data, uint len);
+
+void bgp_init_bucket_table(struct bgp_channel *c);
+void bgp_free_bucket_table(struct bgp_channel *c);
+void bgp_free_bucket(struct bgp_channel *c, struct bgp_bucket *b);
+void bgp_defer_bucket(struct bgp_channel *c, struct bgp_bucket *b);
+void bgp_withdraw_bucket(struct bgp_channel *c, struct bgp_bucket *b);
+
+void bgp_init_prefix_table(struct bgp_channel *c);
+void bgp_free_prefix_table(struct bgp_channel *c);
+void bgp_free_prefix(struct bgp_channel *c, struct bgp_prefix *bp);
-void bgp_attach_attr(struct ea_list **to, struct linpool *pool, unsigned attr, uintptr_t val);
-byte *bgp_attach_attr_wa(struct ea_list **to, struct linpool *pool, unsigned attr, unsigned len);
-struct rta *bgp_decode_attrs(struct bgp_conn *conn, byte *a, uint len, struct linpool *pool, int mandatory);
-int bgp_get_attr(struct eattr *e, byte *buf, int buflen);
int bgp_rte_better(struct rte *, struct rte *);
+int bgp_rte_mergable(rte *pri, rte *sec);
int bgp_rte_recalculate(rtable *table, net *net, rte *new, rte *old, rte *old_best);
-void bgp_rt_notify(struct proto *P, rtable *tbl UNUSED, net *n, rte *new, rte *old UNUSED, ea_list *attrs);
-int bgp_import_control(struct proto *, struct rte **, struct ea_list **, struct linpool *);
-void bgp_init_bucket_table(struct bgp_proto *);
-void bgp_free_bucket(struct bgp_proto *p, struct bgp_bucket *buck);
-void bgp_init_prefix_table(struct bgp_proto *p, u32 order);
-void bgp_free_prefix(struct bgp_proto *p, struct bgp_prefix *bp);
-uint bgp_encode_attrs(struct bgp_proto *p, byte *w, ea_list *attrs, int remains);
-void bgp_get_route_info(struct rte *, byte *buf, struct ea_list *attrs);
-
-inline static void bgp_attach_attr_ip(struct ea_list **to, struct linpool *pool, unsigned attr, ip_addr a)
-{ *(ip_addr *) bgp_attach_attr_wa(to, pool, attr, sizeof(ip_addr)) = a; }
+struct rte *bgp_rte_modify_stale(struct rte *r, struct linpool *pool);
+void bgp_rt_notify(struct proto *P, struct channel *C, net *n, rte *new, rte *old);
+int bgp_preexport(struct proto *, struct rte **, struct linpool *);
+int bgp_get_attr(struct eattr *e, byte *buf, int buflen);
+void bgp_get_route_info(struct rte *, byte *buf);
+
/* packets.c */
-void mrt_dump_bgp_state_change(struct bgp_conn *conn, unsigned old, unsigned new);
-void bgp_schedule_packet(struct bgp_conn *conn, int type);
+void bgp_dump_state_change(struct bgp_conn *conn, uint old, uint new);
+void bgp_prepare_capabilities(struct bgp_conn *conn);
+const struct bgp_af_desc *bgp_get_af_desc(u32 afi);
+const struct bgp_af_caps *bgp_find_af_caps(struct bgp_caps *caps, u32 afi);
+void bgp_schedule_packet(struct bgp_conn *conn, struct bgp_channel *c, int type);
void bgp_kick_tx(void *vconn);
void bgp_tx(struct birdsock *sk);
-int bgp_rx(struct birdsock *sk, int size);
+int bgp_rx(struct birdsock *sk, uint size);
const char * bgp_error_dsc(unsigned code, unsigned subcode);
void bgp_log_error(struct bgp_proto *p, u8 class, char *msg, unsigned code, unsigned subcode, byte *data, unsigned len);
+void bgp_update_next_hop(struct bgp_export_state *s, eattr *a, ea_list **to);
+
+
/* Packet types */
#define PKT_OPEN 0x01
#define BAF_PARTIAL 0x20
#define BAF_EXT_LEN 0x10
-#define BA_ORIGIN 0x01 /* [RFC1771] */ /* WM */
+#define BA_ORIGIN 0x01 /* RFC 4271 */ /* WM */
#define BA_AS_PATH 0x02 /* WM */
#define BA_NEXT_HOP 0x03 /* WM */
#define BA_MULTI_EXIT_DISC 0x04 /* ON */
#define BA_LOCAL_PREF 0x05 /* WD */
#define BA_ATOMIC_AGGR 0x06 /* WD */
#define BA_AGGREGATOR 0x07 /* OT */
-#define BA_COMMUNITY 0x08 /* [RFC1997] */ /* OT */
-#define BA_ORIGINATOR_ID 0x09 /* [RFC1966] */ /* ON */
-#define BA_CLUSTER_LIST 0x0a /* ON */
-/* We don't support these: */
-#define BA_DPA 0x0b /* ??? */
-#define BA_ADVERTISER 0x0c /* [RFC1863] */
-#define BA_RCID_PATH 0x0d
-#define BA_MP_REACH_NLRI 0x0e /* [RFC2283] */
-#define BA_MP_UNREACH_NLRI 0x0f
-#define BA_EXT_COMMUNITY 0x10 /* [RFC4360] */
-#define BA_AS4_PATH 0x11 /* [RFC4893] */
-#define BA_AS4_AGGREGATOR 0x12
+#define BA_COMMUNITY 0x08 /* RFC 1997 */ /* OT */
+#define BA_ORIGINATOR_ID 0x09 /* RFC 4456 */ /* ON */
+#define BA_CLUSTER_LIST 0x0a /* RFC 4456 */ /* ON */
+#define BA_MP_REACH_NLRI 0x0e /* RFC 4760 */
+#define BA_MP_UNREACH_NLRI 0x0f /* RFC 4760 */
+#define BA_EXT_COMMUNITY 0x10 /* RFC 4360 */
+#define BA_AS4_PATH 0x11 /* RFC 6793 */
+#define BA_AS4_AGGREGATOR 0x12 /* RFC 6793 */
+#define BA_LARGE_COMMUNITY 0x20 /* RFC 8092 */
+
+/* Bird's private internal BGP attributes */
+#define BA_MPLS_LABEL_STACK 0xfe /* MPLS label stack transfer attribute */
/* BGP connection states */
*
* When BGP protocol is started by core, it goes to BSS_PREPARE. When BGP
* protocol done what is neccessary to start itself (like acquiring the lock),
- * it goes to BSS_CONNECT. When some connection attempt failed because of
- * option or capability error, it goes to BSS_CONNECT_NOCAP.
+ * it goes to BSS_CONNECT.
*/
#define BSS_PREPARE 0 /* Used before ordinary BGP started, i. e. waiting for lock */
#define BSS_DELAY 1 /* Startup delay due to previous errors */
#define BSS_CONNECT 2 /* Ordinary BGP connecting */
-#define BSS_CONNECT_NOCAP 3 /* Legacy BGP connecting (without capabilities) */
/* BGP feed states (TX)
*
* RFC 7313 specifies that a route refresh should be demarcated by BoRR and EoRR packets.
*
- * These states (stored in p->feed_state) are used to keep track of these
+ * These states (stored in c->feed_state) are used to keep track of these
* requirements. When such feed is started, BFS_LOADING / BFS_REFRESHING is
* set. When it ended, BFS_LOADED / BFS_REFRESHED is set to schedule End-of-RIB
* or EoRR packet. When the packet is sent, the state returned to BFS_NONE.
#define BGP_COMM_NO_ADVERTISE 0xffffff02 /* Don't export at all */
#define BGP_COMM_NO_EXPORT_SUBCONFED 0xffffff03 /* NO_EXPORT even in local confederation */
+#define BGP_COMM_LLGR_STALE 0xffff0006 /* Route is stale according to LLGR */
+#define BGP_COMM_NO_LLGR 0xffff0007 /* Do not treat the route according to LLGR */
+
/* Origins */
#define ORIGIN_IGP 0
#define ORIGIN_EGP 1
#define ORIGIN_INCOMPLETE 2
-/* Address families */
-
-#define BGP_AF_IPV4 1
-#define BGP_AF_IPV6 2
-
-#ifdef IPV6
-#define BGP_AF BGP_AF_IPV6
-#else
-#define BGP_AF BGP_AF_IPV4
-#endif
#endif
projects / thirdparty / bird.git / blobdiff