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iof-bird-daemon / proto / bgp / bgp.h @ 7e5f769d

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/*
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 *        BIRD -- The Border Gateway Protocol
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 *
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 *        (c) 2000 Martin Mares <mj@ucw.cz>
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 *        (c) 2008--2016 Ondrej Zajicek <santiago@crfreenet.org>
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 *        (c) 2008--2016 CZ.NIC z.s.p.o.
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 *
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 *        Can be freely distributed and used under the terms of the GNU GPL.
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 */
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#ifndef _BIRD_BGP_H_
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#define _BIRD_BGP_H_
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#include <stdint.h>
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#include <setjmp.h>
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#include "nest/bird.h"
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#include "nest/route.h"
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#include "nest/bfd.h"
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//#include "lib/lists.h"
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#include "lib/hash.h"
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#include "lib/socket.h"
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struct linpool;
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struct eattr;
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/* Address families */
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#define BGP_AFI_IPV4                1
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#define BGP_AFI_IPV6                2
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#define BGP_SAFI_UNICAST        1
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#define BGP_SAFI_MULTICAST        2
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#define BGP_SAFI_MPLS                4
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#define BGP_SAFI_MPLS_VPN        128
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#define BGP_SAFI_VPN_MULTICAST        129
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#define BGP_SAFI_FLOW                133
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/* Internal AF codes */
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#define BGP_AF(A, B)                (((u32)(A) << 16) | (u32)(B))
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#define BGP_AFI(A)                ((u32)(A) >> 16)
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#define BGP_SAFI(A)                ((u32)(A) & 0xFFFF)
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#define BGP_AF_IPV4                BGP_AF( BGP_AFI_IPV4, BGP_SAFI_UNICAST )
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#define BGP_AF_IPV6                BGP_AF( BGP_AFI_IPV6, BGP_SAFI_UNICAST )
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#define BGP_AF_IPV4_MC                BGP_AF( BGP_AFI_IPV4, BGP_SAFI_MULTICAST )
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#define BGP_AF_IPV6_MC                BGP_AF( BGP_AFI_IPV6, BGP_SAFI_MULTICAST )
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#define BGP_AF_IPV4_MPLS        BGP_AF( BGP_AFI_IPV4, BGP_SAFI_MPLS )
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#define BGP_AF_IPV6_MPLS        BGP_AF( BGP_AFI_IPV6, BGP_SAFI_MPLS )
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#define BGP_AF_VPN4_MPLS        BGP_AF( BGP_AFI_IPV4, BGP_SAFI_MPLS_VPN )
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#define BGP_AF_VPN6_MPLS        BGP_AF( BGP_AFI_IPV6, BGP_SAFI_MPLS_VPN )
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#define BGP_AF_VPN4_MC                BGP_AF( BGP_AFI_IPV4, BGP_SAFI_VPN_MULTICAST )
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#define BGP_AF_VPN6_MC                BGP_AF( BGP_AFI_IPV6, BGP_SAFI_VPN_MULTICAST )
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#define BGP_AF_FLOW4                BGP_AF( BGP_AFI_IPV4, BGP_SAFI_FLOW )
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#define BGP_AF_FLOW6                BGP_AF( BGP_AFI_IPV6, BGP_SAFI_FLOW )
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struct bgp_write_state;
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struct bgp_parse_state;
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struct bgp_export_state;
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struct bgp_bucket;
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struct bgp_af_desc {
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  u32 afi;
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  u32 net;
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  u8 mpls;
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  u8 no_igp;
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  const char *name;
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  uint (*encode_nlri)(struct bgp_write_state *s, struct bgp_bucket *buck, byte *buf, uint size);
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  void (*decode_nlri)(struct bgp_parse_state *s, byte *pos, uint len, rta *a);
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  void (*update_next_hop)(struct bgp_export_state *s, eattr *nh, ea_list **to);
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  uint (*encode_next_hop)(struct bgp_write_state *s, eattr *nh, byte *buf, uint size);
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  void (*decode_next_hop)(struct bgp_parse_state *s, byte *pos, uint len, rta *a);
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};
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struct bgp_config {
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  struct proto_config c;
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  u32 local_as, remote_as;
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  ip_addr local_ip;                        /* Source address to use */
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  ip_addr remote_ip;
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  struct iface *iface;                        /* Interface for link-local addresses */
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  u16 local_port;                        /* Local listening port */
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  u16 remote_port;                         /* Neighbor destination port */
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  int multihop;                                /* Number of hops if multihop */
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  int strict_bind;                        /* Bind listening socket to local address */
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  int ttl_security;                        /* Enable TTL security [RFC 5082] */
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  int compare_path_lengths;                /* Use path lengths when selecting best route */
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  int med_metric;                        /* Compare MULTI_EXIT_DISC even between routes from differen ASes */
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  int igp_metric;                        /* Use IGP metrics when selecting best route */
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  int prefer_older;                        /* Prefer older routes according to RFC 5004 */
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  int deterministic_med;                /* Use more complicated algo to have strict RFC 4271 MED comparison */
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  u32 default_local_pref;                /* Default value for LOCAL_PREF attribute */
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  u32 default_med;                        /* Default value for MULTI_EXIT_DISC attribute */
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  int capabilities;                        /* Enable capability handshake [RFC 5492] */
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  int enable_refresh;                        /* Enable local support for route refresh [RFC 2918] */
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  int enable_as4;                        /* Enable local support for 4B AS numbers [RFC 6793] */
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  int enable_extended_messages;                /* Enable local support for extended messages [draft] */
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  u32 rr_cluster_id;                        /* Route reflector cluster ID, if different from local ID */
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  int rr_client;                        /* Whether neighbor is RR client of me */
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  int rs_client;                        /* Whether neighbor is RS client of me */
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  u32 confederation;                        /* Confederation ID, or zero if confeds not active */
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  int confederation_member;                /* Whether neighbor AS is member of our confederation */
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  int passive;                                /* Do not initiate outgoing connection */
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  int interpret_communities;                /* Hardwired handling of well-known communities */
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  int allow_local_as;                        /* Allow that number of local ASNs in incoming AS_PATHs */
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  int allow_local_pref;                        /* Allow LOCAL_PREF in EBGP sessions */
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  int gr_mode;                                /* Graceful restart mode (BGP_GR_*) */
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  int llgr_mode;                        /* Long-lived graceful restart mode (BGP_LLGR_*) */
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  int setkey;                                /* Set MD5 password to system SA/SP database */
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  /* Times below are in seconds */
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  unsigned gr_time;                        /* Graceful restart timeout */
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  unsigned llgr_time;                        /* Long-lived graceful restart stale time */
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  unsigned connect_delay_time;                /* Minimum delay between connect attempts */
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  unsigned connect_retry_time;                /* Timeout for connect attempts */
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  unsigned hold_time, initial_hold_time;
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  unsigned keepalive_time;
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  unsigned error_amnesia_time;                /* Errors are forgotten after */
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  unsigned error_delay_time_min;        /* Time to wait after an error is detected */
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  unsigned error_delay_time_max;
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  unsigned disable_after_error;                /* Disable the protocol when error is detected */
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  u32 disable_after_cease;                /* Disable it when cease is received, bitfield */
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  char *password;                        /* Password used for MD5 authentication */
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  int check_link;                        /* Use iface link state for liveness detection */
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  int bfd;                                /* Use BFD for liveness detection */
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};
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struct bgp_channel_config {
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  struct channel_config c;
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  u32 afi;
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  const struct bgp_af_desc *desc;
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  ip_addr next_hop_addr;                /* Local address for NEXT_HOP attribute */
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  u8 next_hop_self;                        /* Always set next hop to local IP address (NH_*) */
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  u8 next_hop_keep;                        /* Do not modify next hop attribute (NH_*) */
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  u8 missing_lladdr;                        /* What we will do when we don' know link-local addr, see MLL_* */
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  u8 gw_mode;                                /* How we compute route gateway from next_hop attr, see GW_* */
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  u8 secondary;                                /* Accept also non-best routes (i.e. RA_ACCEPTED) */
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  u8 gr_able;                                /* Allow full graceful restart for the channel */
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  u8 llgr_able;                                /* Allow full long-lived GR for the channel */
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  uint llgr_time;                        /* Long-lived graceful restart stale time */
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  u8 ext_next_hop;                        /* Allow both IPv4 and IPv6 next hops */
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  u8 add_path;                                /* Use ADD-PATH extension [RFC 7911] */
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  u8 import_table;                        /* Use c.in_table as Adj-RIB-In */
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  uint rest[0];                                /* Remaining items are reconfigured separately */
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  struct rtable_config *igp_table_ip4;        /* Table for recursive IPv4 next hop lookups */
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  struct rtable_config *igp_table_ip6;        /* Table for recursive IPv6 next hop lookups */
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};
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#define NH_NO                        0
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#define NH_ALL                        1
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#define NH_IBGP                        2
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#define NH_EBGP                        3
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#define MLL_SELF                1
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#define MLL_DROP                2
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#define MLL_IGNORE                3
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#define GW_DIRECT                1
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#define GW_RECURSIVE                2
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#define BGP_ADD_PATH_RX                1
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#define BGP_ADD_PATH_TX                2
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#define BGP_ADD_PATH_FULL        3
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#define BGP_GR_ABLE                1
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#define BGP_GR_AWARE                2
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/* For GR capability common flags */
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#define BGP_GRF_RESTART 0x80
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/* For GR capability per-AF flags */
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#define BGP_GRF_FORWARDING 0x80
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#define BGP_LLGR_ABLE                1
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#define BGP_LLGR_AWARE                2
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#define BGP_LLGRF_FORWARDING 0x80
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#define BGP_GRS_NONE                0        /* No GR  */
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#define BGP_GRS_ACTIVE                1        /* Graceful restart per RFC 4724 */
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#define BGP_GRS_LLGR                2        /* Long-lived GR phase (stale timer active) */
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#define BGP_BFD_GRACEFUL        2        /* BFD down triggers graceful restart */
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struct bgp_af_caps {
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  u32 afi;
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  u8 ready;                                /* Multiprotocol capability, RFC 4760 */
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  u8 gr_able;                                /* Graceful restart support, RFC 4724 */
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  u8 gr_af_flags;                        /* Graceful restart per-AF flags */
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  u8 llgr_able;                                /* Long-lived GR, RFC draft */
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  u32 llgr_time;                        /* Long-lived GR stale time */
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  u8 llgr_flags;                        /* Long-lived GR per-AF flags */
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  u8 ext_next_hop;                        /* Extended IPv6 next hop,   RFC 5549 */
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  u8 add_path;                                /* Multiple paths support,   RFC 7911 */
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};
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struct bgp_caps {
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  u32 as4_number;                        /* Announced ASN */
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  u8 as4_support;                        /* Four-octet AS capability, RFC 6793 */
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  u8 ext_messages;                        /* Extended message length,  RFC draft */
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  u8 route_refresh;                        /* Route refresh capability, RFC 2918 */
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  u8 enhanced_refresh;                        /* Enhanced route refresh,   RFC 7313 */
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  u8 gr_aware;                                /* Graceful restart capability, RFC 4724 */
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  u8 gr_flags;                                /* Graceful restart flags */
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  u16 gr_time;                                /* Graceful restart time in seconds */
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  u8 llgr_aware;                        /* Long-lived GR capability, RFC draft */
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  u16 af_count;                                /* Number of af_data items */
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  u16 length;                                /* Length of capabilities in OPEN msg */
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  struct bgp_af_caps af_data[0];        /* Per-AF capability data */
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};
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#define WALK_AF_CAPS(caps,ac) \
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  for (ac = caps->af_data; ac < &caps->af_data[caps->af_count]; ac++)
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struct bgp_socket {
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  node n;                                /* Node in global bgp_sockets */
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  sock *sk;                                /* Real listening socket */
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  u32 uc;                                /* Use count */
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};
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struct bgp_conn {
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  struct bgp_proto *bgp;
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  struct birdsock *sk;
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  u8 state;                                /* State of connection state machine */
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  u8 as4_session;                        /* Session uses 4B AS numbers in AS_PATH (both sides support it) */
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  u8 ext_messages;                        /* Session uses extended message length */
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  struct bgp_caps *local_caps;
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  struct bgp_caps *remote_caps;
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  timer *connect_timer;
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  timer *hold_timer;
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  timer *keepalive_timer;
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  event *tx_ev;
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  u32 packets_to_send;                        /* Bitmap of packet types to be sent */
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  u32 channels_to_send;                        /* Bitmap of channels with packets to be sent */
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  u8 last_channel;                        /* Channel used last time for TX */
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  u8 last_channel_count;                /* Number of times the last channel was used in succession */
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  int notify_code, notify_subcode, notify_size;
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  byte *notify_data;
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  uint hold_time, keepalive_time;        /* Times calculated from my and neighbor's requirements */
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};
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struct bgp_proto {
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  struct proto p;
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  struct bgp_config *cf;                /* Shortcut to BGP configuration */
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  u32 local_as, remote_as;
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  u32 public_as;                        /* Externally visible ASN (local_as or confederation id) */
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  u32 local_id;                                /* BGP identifier of this router */
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  u32 remote_id;                        /* BGP identifier of the neighbor */
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  u32 rr_cluster_id;                        /* Route reflector cluster ID */
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  int start_state;                        /* Substates that partitions BS_START */
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  u8 is_internal;                        /* Internal BGP session (local_as == remote_as) */
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  u8 is_interior;                        /* Internal or intra-confederation BGP session */
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  u8 as4_session;                        /* Session uses 4B AS numbers in AS_PATH (both sides support it) */
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  u8 rr_client;                                /* Whether neighbor is RR client of me */
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  u8 rs_client;                                /* Whether neighbor is RS client of me */
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  u8 route_refresh;                        /* Route refresh allowed to send [RFC 2918] */
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  u8 enhanced_refresh;                        /* Enhanced refresh is negotiated [RFC 7313] */
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  u8 gr_ready;                                /* Neighbor could do graceful restart */
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  u8 llgr_ready;                        /* Neighbor could do Long-lived GR, implies gr_ready */
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  u8 gr_active_num;                        /* Neighbor is doing GR, number of active channels */
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  u8 channel_count;                        /* Number of active channels */
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  u8 summary_add_path_rx;                /* Summary state of ADD_PATH RX w.r.t active channels */
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  u32 *afi_map;                                /* Map channel index -> AFI */
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  struct bgp_channel **channel_map;        /* Map channel index -> channel */
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  struct bgp_conn *conn;                /* Connection we have established */
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  struct bgp_conn outgoing_conn;        /* Outgoing connection we're working with */
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  struct bgp_conn incoming_conn;        /* Incoming connection we have neither accepted nor rejected yet */
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  struct object_lock *lock;                /* Lock for neighbor connection */
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  struct neighbor *neigh;                /* Neighbor entry corresponding to remote ip, NULL if multihop */
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  struct bgp_socket *sock;                /* Shared listening socket */
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  struct bfd_request *bfd_req;                /* BFD request, if BFD is used */
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  ip_addr source_addr;                        /* Local address used as an advertised next hop */
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  ip_addr link_addr;                        /* Link-local version of source_addr */
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  event *event;                                /* Event for respawning and shutting process */
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  timer *startup_timer;                        /* Timer used to delay protocol startup due to previous errors (startup_delay) */
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  timer *gr_timer;                        /* Timer waiting for reestablishment after graceful restart */
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  uint startup_delay;                        /* Delay (in seconds) of protocol startup due to previous errors */
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  btime last_proto_error;                /* Time of last error that leads to protocol stop */
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  u8 last_error_class;                         /* Error class of last error */
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  u32 last_error_code;                        /* Error code of last error. BGP protocol errors
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                                           are encoded as (bgp_err_code << 16 | bgp_err_subcode) */
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};
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struct bgp_channel {
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  struct channel c;
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  /* Rest are BGP specific data */
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  struct bgp_channel_config *cf;
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  u32 afi;
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  u32 index;
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  const struct bgp_af_desc *desc;
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  rtable *igp_table_ip4;                /* Table for recursive IPv4 next hop lookups */
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  rtable *igp_table_ip6;                /* Table for recursive IPv6 next hop lookups */
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  /* Rest are zeroed when down */
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  pool *pool;
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  HASH(struct bgp_bucket) bucket_hash;        /* Hash table of route buckets */
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  struct bgp_bucket *withdraw_bucket;        /* Withdrawn routes */
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  list bucket_queue;                        /* Queue of buckets to send (struct bgp_bucket) */
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  HASH(struct bgp_prefix) prefix_hash;        /* Prefixes to be sent */
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  slab *prefix_slab;                        /* Slab holding prefix nodes */
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  ip_addr next_hop_addr;                /* Local address for NEXT_HOP attribute */
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  ip_addr link_addr;                        /* Link-local version of next_hop_addr */
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  u32 packets_to_send;                        /* Bitmap of packet types to be sent */
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  u8 ext_next_hop;                        /* Session allows both IPv4 and IPv6 next hops */
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  u8 gr_ready;                                /* Neighbor could do GR on this AF */
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  u8 gr_active;                                /* Neighbor is doing GR (BGP_GRS_*) */
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  timer *stale_timer;                        /* Long-lived stale timer for LLGR */
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  u32 stale_time;                        /* Stored LLGR stale time from last session */
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  u8 add_path_rx;                        /* Session expects receive of ADD-PATH extended NLRI */
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  u8 add_path_tx;                        /* Session expects transmit of ADD-PATH extended NLRI */
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  u8 feed_state;                        /* Feed state (TX) for EoR, RR packets, see BFS_* */
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  u8 load_state;                        /* Load state (RX) for EoR, RR packets, see BFS_* */
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};
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struct bgp_prefix {
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  node buck_node;                        /* Node in per-bucket list */
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  struct bgp_prefix *next;                /* Node in prefix hash table */
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  u32 hash;
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  u32 path_id;
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  net_addr net[0];
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};
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struct bgp_bucket {
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  node send_node;                        /* Node in send queue */
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  struct bgp_bucket *next;                /* Node in bucket hash table */
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  list prefixes;                        /* Prefixes in this bucket (struct bgp_prefix) */
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  u32 hash;                                /* Hash over extended attributes */
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  ea_list eattrs[0];                        /* Per-bucket extended attributes */
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};
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struct bgp_export_state {
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  struct bgp_proto *proto;
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  struct bgp_channel *channel;
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  struct linpool *pool;
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  struct bgp_proto *src;
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  rte *route;
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  int mpls;
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  u32 attrs_seen[1];
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  uint err_withdraw;
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};
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struct bgp_write_state {
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  struct bgp_proto *proto;
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  struct bgp_channel *channel;
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  struct linpool *pool;
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  int mp_reach;
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  int as4_session;
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  int add_path;
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  int mpls;
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  eattr *mp_next_hop;
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  adata *mpls_labels;
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};
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struct bgp_parse_state {
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  struct bgp_proto *proto;
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  struct bgp_channel *channel;
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  struct linpool *pool;
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  int as4_session;
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  int add_path;
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  int mpls;
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  u32 attrs_seen[256/32];
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  u32 mp_reach_af;
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  u32 mp_unreach_af;
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  uint attr_len;
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  uint ip_reach_len;
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  uint ip_unreach_len;
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  uint ip_next_hop_len;
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  uint mp_reach_len;
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  uint mp_unreach_len;
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  uint mp_next_hop_len;
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  byte *attrs;
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  byte *ip_reach_nlri;
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  byte *ip_unreach_nlri;
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  byte *ip_next_hop_data;
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  byte *mp_reach_nlri;
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  byte *mp_unreach_nlri;
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  byte *mp_next_hop_data;
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  uint err_withdraw;
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  uint err_subcode;
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  jmp_buf err_jmpbuf;
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  struct hostentry *hostentry;
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  adata *mpls_labels;
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  /* Cached state for bgp_rte_update() */
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  u32 last_id;
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  struct rte_src *last_src;
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  rta *cached_rta;
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};
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#define BGP_PORT                179
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#define BGP_VERSION                4
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#define BGP_HEADER_LENGTH        19
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#define BGP_MAX_MESSAGE_LENGTH        4096
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#define BGP_MAX_EXT_MSG_LENGTH        65535
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#define BGP_RX_BUFFER_SIZE        4096
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#define BGP_TX_BUFFER_SIZE        4096
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#define BGP_RX_BUFFER_EXT_SIZE        65535
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#define BGP_TX_BUFFER_EXT_SIZE        65535
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static inline int bgp_channel_is_ipv4(struct bgp_channel *c)
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{ return BGP_AFI(c->afi) == BGP_AFI_IPV4; }
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static inline int bgp_channel_is_ipv6(struct bgp_channel *c)
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{ return BGP_AFI(c->afi) == BGP_AFI_IPV6; }
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static inline int bgp_cc_is_ipv4(struct bgp_channel_config *c)
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{ return BGP_AFI(c->afi) == BGP_AFI_IPV4; }
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static inline int bgp_cc_is_ipv6(struct bgp_channel_config *c)
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{ return BGP_AFI(c->afi) == BGP_AFI_IPV6; }
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static inline uint bgp_max_packet_length(struct bgp_conn *conn)
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{ return conn->ext_messages ? BGP_MAX_EXT_MSG_LENGTH : BGP_MAX_MESSAGE_LENGTH; }
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static inline void
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bgp_parse_error(struct bgp_parse_state *s, uint subcode)
453
{
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  s->err_subcode = subcode;
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  longjmp(s->err_jmpbuf, 1);
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}
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extern struct linpool *bgp_linpool;
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extern struct linpool *bgp_linpool2;
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void bgp_start_timer(timer *t, uint value);
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void bgp_check_config(struct bgp_config *c);
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void bgp_error(struct bgp_conn *c, unsigned code, unsigned subcode, byte *data, int len);
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void bgp_close_conn(struct bgp_conn *c);
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void bgp_update_startup_delay(struct bgp_proto *p);
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void bgp_conn_enter_openconfirm_state(struct bgp_conn *conn);
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void bgp_conn_enter_established_state(struct bgp_conn *conn);
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void bgp_conn_enter_close_state(struct bgp_conn *conn);
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void bgp_conn_enter_idle_state(struct bgp_conn *conn);
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void bgp_handle_graceful_restart(struct bgp_proto *p);
472
void bgp_graceful_restart_done(struct bgp_channel *c);
473
void bgp_refresh_begin(struct bgp_channel *c);
474
void bgp_refresh_end(struct bgp_channel *c);
475
void bgp_store_error(struct bgp_proto *p, struct bgp_conn *c, u8 class, u32 code);
476
void bgp_stop(struct bgp_proto *p, uint subcode, byte *data, uint len);
477

    
478
struct rte_source *bgp_find_source(struct bgp_proto *p, u32 path_id);
479
struct rte_source *bgp_get_source(struct bgp_proto *p, u32 path_id);
480

    
481

    
482

    
483
#ifdef LOCAL_DEBUG
484
#define BGP_FORCE_DEBUG 1
485
#else
486
#define BGP_FORCE_DEBUG 0
487
#endif
488
#define BGP_TRACE(flags, msg, args...) do { if ((p->p.debug & flags) || BGP_FORCE_DEBUG) \
489
        log(L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
490

    
491
#define BGP_TRACE_RL(rl, flags, msg, args...) do { if ((p->p.debug & flags) || BGP_FORCE_DEBUG) \
492
        log_rl(rl, L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
493

    
494

    
495
/* attrs.c */
496

    
497
static inline eattr *
498
bgp_find_attr(ea_list *attrs, uint code)
499
{
500
  return ea_find(attrs, EA_CODE(PROTOCOL_BGP, code));
501
}
502

    
503
eattr *
504
bgp_set_attr(ea_list **attrs, struct linpool *pool, uint code, uint flags, uintptr_t val);
505

    
506
static inline void
507
bgp_set_attr_u32(ea_list **to, struct linpool *pool, uint code, uint flags, u32 val)
508
{ bgp_set_attr(to, pool, code, flags, (uintptr_t) val); }
509

    
510
static inline void
511
bgp_set_attr_ptr(ea_list **to, struct linpool *pool, uint code, uint flags, struct adata *val)
512
{ bgp_set_attr(to, pool, code, flags, (uintptr_t) val); }
513

    
514
static inline void
515
bgp_set_attr_data(ea_list **to, struct linpool *pool, uint code, uint flags, void *data, uint len)
516
{
517
  struct adata *a = lp_alloc_adata(pool, len);
518
  memcpy(a->data, data, len);
519
  bgp_set_attr(to, pool, code, flags, (uintptr_t) a);
520
}
521

    
522
static inline void
523
bgp_unset_attr(ea_list **to, struct linpool *pool, uint code)
524
{ eattr *e = bgp_set_attr(to, pool, code, 0, 0); e->type = EAF_TYPE_UNDEF; }
525

    
526

    
527
int bgp_encode_attrs(struct bgp_write_state *s, ea_list *attrs, byte *buf, byte *end);
528
ea_list * bgp_decode_attrs(struct bgp_parse_state *s, byte *data, uint len);
529

    
530
void bgp_init_bucket_table(struct bgp_channel *c);
531
void bgp_free_bucket_table(struct bgp_channel *c);
532
void bgp_free_bucket(struct bgp_channel *c, struct bgp_bucket *b);
533
void bgp_defer_bucket(struct bgp_channel *c, struct bgp_bucket *b);
534
void bgp_withdraw_bucket(struct bgp_channel *c, struct bgp_bucket *b);
535

    
536
void bgp_init_prefix_table(struct bgp_channel *c);
537
void bgp_free_prefix_table(struct bgp_channel *c);
538
void bgp_free_prefix(struct bgp_channel *c, struct bgp_prefix *bp);
539

    
540
int bgp_rte_better(struct rte *, struct rte *);
541
int bgp_rte_mergable(rte *pri, rte *sec);
542
int bgp_rte_recalculate(rtable *table, net *net, rte *new, rte *old, rte *old_best);
543
struct rte *bgp_rte_modify_stale(struct rte *r, struct linpool *pool);
544
void bgp_rt_notify(struct proto *P, struct channel *C, net *n, rte *new, rte *old);
545
int bgp_preexport(struct proto *, struct rte **, struct linpool *);
546
int bgp_get_attr(struct eattr *e, byte *buf, int buflen);
547
void bgp_get_route_info(struct rte *, byte *buf);
548

    
549

    
550
/* packets.c */
551

    
552
void bgp_dump_state_change(struct bgp_conn *conn, uint old, uint new);
553
const struct bgp_af_desc *bgp_get_af_desc(u32 afi);
554
const struct bgp_af_caps *bgp_find_af_caps(struct bgp_caps *caps, u32 afi);
555
void bgp_schedule_packet(struct bgp_conn *conn, struct bgp_channel *c, int type);
556
void bgp_kick_tx(void *vconn);
557
void bgp_tx(struct birdsock *sk);
558
int bgp_rx(struct birdsock *sk, uint size);
559
const char * bgp_error_dsc(unsigned code, unsigned subcode);
560
void bgp_log_error(struct bgp_proto *p, u8 class, char *msg, unsigned code, unsigned subcode, byte *data, unsigned len);
561

    
562
void bgp_update_next_hop(struct bgp_export_state *s, eattr *a, ea_list **to);
563

    
564

    
565
/* Packet types */
566

    
567
#define PKT_OPEN                0x01
568
#define PKT_UPDATE                0x02
569
#define PKT_NOTIFICATION        0x03
570
#define PKT_KEEPALIVE                0x04
571
#define PKT_ROUTE_REFRESH        0x05        /* [RFC2918] */
572
#define PKT_BEGIN_REFRESH        0x1e        /* Dummy type for BoRR packet [RFC7313] */
573
#define PKT_SCHEDULE_CLOSE        0x1f        /* Used internally to schedule socket close */
574

    
575
/* Attributes */
576

    
577
#define BAF_OPTIONAL                0x80
578
#define BAF_TRANSITIVE                0x40
579
#define BAF_PARTIAL                0x20
580
#define BAF_EXT_LEN                0x10
581

    
582
#define BA_ORIGIN                0x01        /* RFC 4271 */                /* WM */
583
#define BA_AS_PATH                0x02                                /* WM */
584
#define BA_NEXT_HOP                0x03                                /* WM */
585
#define BA_MULTI_EXIT_DISC        0x04                                /* ON */
586
#define BA_LOCAL_PREF                0x05                                /* WD */
587
#define BA_ATOMIC_AGGR                0x06                                /* WD */
588
#define BA_AGGREGATOR                0x07                                /* OT */
589
#define BA_COMMUNITY                0x08        /* RFC 1997 */                /* OT */
590
#define BA_ORIGINATOR_ID        0x09        /* RFC 4456 */                /* ON */
591
#define BA_CLUSTER_LIST                0x0a        /* RFC 4456 */                /* ON */
592
#define BA_MP_REACH_NLRI        0x0e        /* RFC 4760 */
593
#define BA_MP_UNREACH_NLRI        0x0f        /* RFC 4760 */
594
#define BA_EXT_COMMUNITY        0x10        /* RFC 4360 */
595
#define BA_AS4_PATH             0x11        /* RFC 6793 */
596
#define BA_AS4_AGGREGATOR       0x12        /* RFC 6793 */
597
#define BA_LARGE_COMMUNITY        0x20        /* RFC 8092 */
598

    
599
/* Bird's private internal BGP attributes */
600
#define BA_MPLS_LABEL_STACK        0xfe        /* MPLS label stack transfer attribute */
601

    
602
/* BGP connection states */
603

    
604
#define BS_IDLE                        0
605
#define BS_CONNECT                1        /* Attempting to connect */
606
#define BS_ACTIVE                2        /* Waiting for connection retry & listening */
607
#define BS_OPENSENT                3
608
#define BS_OPENCONFIRM                4
609
#define BS_ESTABLISHED                5
610
#define BS_CLOSE                6        /* Used during transition to BS_IDLE */
611

    
612
#define BS_MAX                        7
613

    
614
/* BGP start states
615
 *
616
 * Used in PS_START for fine-grained specification of starting state.
617
 *
618
 * When BGP protocol is started by core, it goes to BSS_PREPARE. When BGP
619
 * protocol done what is neccessary to start itself (like acquiring the lock),
620
 * it goes to BSS_CONNECT.
621
 */
622

    
623
#define BSS_PREPARE                0        /* Used before ordinary BGP started, i. e. waiting for lock */
624
#define BSS_DELAY                1        /* Startup delay due to previous errors */
625
#define BSS_CONNECT                2        /* Ordinary BGP connecting */
626

    
627

    
628
/* BGP feed states (TX)
629
 *
630
 * RFC 4724 specifies that an initial feed should end with End-of-RIB mark.
631
 *
632
 * RFC 7313 specifies that a route refresh should be demarcated by BoRR and EoRR packets.
633
 *
634
 * These states (stored in c->feed_state) are used to keep track of these
635
 * requirements. When such feed is started, BFS_LOADING / BFS_REFRESHING is
636
 * set. When it ended, BFS_LOADED / BFS_REFRESHED is set to schedule End-of-RIB
637
 * or EoRR packet. When the packet is sent, the state returned to BFS_NONE.
638
 *
639
 * Note that when a non-demarcated feed (e.g. plain RFC 4271 initial load
640
 * without End-of-RIB or plain RFC 2918 route refresh without BoRR/EoRR
641
 * demarcation) is active, BFS_NONE is set.
642
 *
643
 * BFS_NONE, BFS_LOADING and BFS_REFRESHING are also used as load states (RX)
644
 * with correspondent semantics (-, expecting End-of-RIB, expecting EoRR).
645
 */
646

    
647
#define BFS_NONE                0        /* No feed or original non-demarcated feed */
648
#define BFS_LOADING                1        /* Initial feed active, End-of-RIB planned */
649
#define BFS_LOADED                2        /* Loading done, End-of-RIB marker scheduled */
650
#define BFS_REFRESHING                3        /* Route refresh (introduced by BoRR) active */
651
#define BFS_REFRESHED                4        /* Refresh done, EoRR packet scheduled */
652

    
653

    
654
/* Error classes */
655

    
656
#define BE_NONE                        0
657
#define BE_MISC                        1        /* Miscellaneous error */
658
#define BE_SOCKET                2        /* Socket error */
659
#define BE_BGP_RX                3        /* BGP protocol error notification received */
660
#define BE_BGP_TX                4        /* BGP protocol error notification sent */
661
#define BE_AUTO_DOWN                5        /* Automatic shutdown */
662
#define BE_MAN_DOWN                6        /* Manual shutdown */
663

    
664
/* Misc error codes */
665

    
666
#define BEM_NEIGHBOR_LOST        1
667
#define BEM_INVALID_NEXT_HOP        2
668
#define BEM_INVALID_MD5                3        /* MD5 authentication kernel request failed (possibly not supported) */
669
#define BEM_NO_SOCKET                4
670
#define BEM_LINK_DOWN                5
671
#define BEM_BFD_DOWN                6
672
#define BEM_GRACEFUL_RESTART        7
673

    
674
/* Automatic shutdown error codes */
675

    
676
#define BEA_ROUTE_LIMIT_EXCEEDED 1
677

    
678
/* Well-known communities */
679

    
680
#define BGP_COMM_NO_EXPORT                0xffffff01        /* Don't export outside local AS / confed. */
681
#define BGP_COMM_NO_ADVERTISE                0xffffff02        /* Don't export at all */
682
#define BGP_COMM_NO_EXPORT_SUBCONFED        0xffffff03        /* NO_EXPORT even in local confederation */
683

    
684
#define BGP_COMM_LLGR_STALE                0xffff0006        /* Route is stale according to LLGR */
685
#define BGP_COMM_NO_LLGR                0xffff0007        /* Do not treat the route according to LLGR */
686

    
687
/* Origins */
688

    
689
#define ORIGIN_IGP                0
690
#define ORIGIN_EGP                1
691
#define ORIGIN_INCOMPLETE        2
692

    
693

    
694
#endif