/* $OpenBSD: rde.h,v 1.57 2004/09/28 15:48:52 claudio Exp $ */ /* * Copyright (c) 2003, 2004 Claudio Jeker and * Andre Oppermann * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #ifndef __RDE_H__ #define __RDE_H__ #include #include #include #include "bgpd.h" /* rde internal structures */ enum peer_state { PEER_NONE, PEER_DOWN, PEER_UP, PEER_ERR /* error occurred going to PEER_DOWN state */ }; /* * How do we identify peers between the session handler and the rde? * Currently I assume that we can do that with the neighbor_ip... */ LIST_HEAD(rde_peer_head, rde_peer); LIST_HEAD(aspath_head, rde_aspath); RB_HEAD(uptree_prefix, update_prefix); RB_HEAD(uptree_attr, update_attr); TAILQ_HEAD(uplist_prefix, update_prefix); TAILQ_HEAD(uplist_attr, update_attr); struct rde_peer { LIST_ENTRY(rde_peer) hash_l; /* hash list over all peers */ LIST_ENTRY(rde_peer) peer_l; /* list of all peers */ struct aspath_head path_h; /* list of all as paths */ struct peer_config conf; enum peer_state state; u_int32_t prefix_cnt; u_int32_t remote_bgpid; struct bgpd_addr remote_addr; struct bgpd_addr local_addr; u_int32_t up_pcnt; u_int32_t up_acnt; u_int32_t up_nlricnt; u_int32_t up_wcnt; struct uptree_prefix up_prefix; struct uptree_attr up_attrs; struct uplist_attr updates; struct uplist_prefix withdraws; struct uplist_attr updates6; struct uplist_prefix withdraws6; }; #define AS_SET 1 #define AS_SEQUENCE 2 #define ASPATH_HEADER_SIZE (sizeof(struct aspath) - sizeof(u_char)) LIST_HEAD(aspath_list, aspath); struct aspath { LIST_ENTRY(aspath) entry; int refcnt; /* reference count */ u_int16_t len; /* total length of aspath in octets */ u_int16_t ascnt; /* number of AS hops in data */ u_char data[1]; /* placeholder for actual data */ }; enum attrtypes { ATTR_UNDEF, ATTR_ORIGIN, ATTR_ASPATH, ATTR_NEXTHOP, ATTR_MED, ATTR_LOCALPREF, ATTR_ATOMIC_AGGREGATE, ATTR_AGGREGATOR, ATTR_COMMUNITIES, ATTR_ORIGINATOR_ID, ATTR_CLUSTER_LIST, ATTR_MP_REACH_NLRI=14, ATTR_MP_UNREACH_NLRI=15 }; /* attribute flags. 4 low order bits reserved */ #define ATTR_EXTLEN 0x10 #define ATTR_PARTIAL 0x20 #define ATTR_TRANSITIVE 0x40 #define ATTR_OPTIONAL 0x80 /* default attribute flags for well known attributes */ #define ATTR_WELL_KNOWN ATTR_TRANSITIVE struct attr { TAILQ_ENTRY(attr) entry; u_int8_t flags; u_int8_t type; u_int16_t len; u_char *data; }; struct mpattr { void *reach; u_int16_t reach_len; void *unreach; u_int16_t unreach_len; }; TAILQ_HEAD(attr_list, attr); struct path_table { struct aspath_head *path_hashtbl; u_int32_t path_hashmask; }; LIST_HEAD(prefix_head, prefix); #define F_ATTR_ORIGIN 0x001 #define F_ATTR_ASPATH 0x002 #define F_ATTR_NEXTHOP 0x004 #define F_ATTR_LOCALPREF 0x008 #define F_ATTR_MED 0x010 #define F_ATTR_MED_ANNOUNCE 0x020 #define F_ATTR_MP_REACH 0x040 #define F_ATTR_MP_UNREACH 0x080 #define F_PREFIX_ANNOUNCED 0x100 #define F_NEXTHOP_REJECT 0x200 #define F_NEXTHOP_BLACKHOLE 0x400 #define F_ATTR_LINKED 0x800 #define ORIGIN_IGP 0 #define ORIGIN_EGP 1 #define ORIGIN_INCOMPLETE 2 #define DEFAULT_LPREF 100 struct rde_aspath { LIST_ENTRY(rde_aspath) path_l, peer_l, nexthop_l; struct prefix_head prefix_h; struct rde_peer *peer; /* path attributes */ struct aspath *aspath; struct nexthop *nexthop; /* may be NULL */ struct attr_list others; u_int32_t med; /* multi exit disc */ u_int32_t lpref; /* local pref */ u_int8_t origin; u_int16_t flags; /* internally used */ u_int16_t prefix_cnt; /* # of prefixes */ u_int16_t active_cnt; /* # of active prefixes */ char pftable[PFTABLE_LEN]; }; enum nexthop_state { NEXTHOP_LOOKUP, NEXTHOP_UNREACH, NEXTHOP_REACH }; struct nexthop { LIST_ENTRY(nexthop) nexthop_l; struct aspath_head path_h; #if 0 /* * currently we use the boolean nexthop state, this could be exchanged * with a variable cost with a max for unreachable. */ u_int32_t costs; #endif enum nexthop_state state; struct bgpd_addr exit_nexthop; struct bgpd_addr true_nexthop; struct bgpd_addr nexthop_net; u_int8_t nexthop_netlen; u_int8_t flags; #define NEXTHOP_CONNECTED 0x01 #define NEXTHOP_LINKLOCAL 0x02 }; /* generic entry without address specific part */ struct pt_entry { RB_ENTRY(pt_entry) pt_e; sa_family_t af; u_int8_t prefixlen; struct prefix_head prefix_h; struct prefix *active; /* for fast access */ }; struct pt_entry4 { RB_ENTRY(pt_entry) pt_e; sa_family_t af; u_int8_t prefixlen; struct prefix_head prefix_h; struct prefix *active; /* for fast access */ struct in_addr prefix4; /* * Route Flap Damping structures * Currently I think they belong into the prefix but for the moment * we just ignore the dampening at all. */ }; struct pt_entry6 { RB_ENTRY(pt_entry) pt_e; sa_family_t af; u_int8_t prefixlen; struct prefix_head prefix_h; struct prefix *active; /* for fast access */ struct in6_addr prefix6; }; struct prefix { LIST_ENTRY(prefix) prefix_l, path_l; struct rde_aspath *aspath; struct pt_entry *prefix; struct rde_peer *peer; time_t lastchange; }; /* prototypes */ /* rde.c */ void rde_send_kroute(struct prefix *, struct prefix *); void rde_send_nexthop(struct bgpd_addr *, int); void rde_send_pftable(const char *, struct bgpd_addr *, u_int8_t, int); void rde_send_pftable_commit(void); void rde_generate_updates(struct prefix *, struct prefix *); u_int16_t rde_local_as(void); int rde_noevaluate(void); /* rde_attr.c */ int attr_write(void *, u_int16_t, u_int8_t, u_int8_t, void *, u_int16_t); void attr_optcopy(struct rde_aspath *, struct rde_aspath *); int attr_optadd(struct rde_aspath *, u_int8_t, u_int8_t, void *, u_int16_t); struct attr *attr_optget(const struct rde_aspath *, u_int8_t); void attr_optfree(struct rde_aspath *); int attr_mp_nexthop(u_char *, u_int16_t, u_int16_t, struct rde_aspath *); int aspath_verify(void *, u_int16_t); #define AS_ERR_LEN -1 #define AS_ERR_TYPE -2 #define AS_ERR_BAD -3 void aspath_init(u_int32_t); void aspath_shutdown(void); struct aspath *aspath_get(void *, u_int16_t); void aspath_put(struct aspath *); u_char *aspath_dump(struct aspath *); u_int16_t aspath_length(struct aspath *); u_int16_t aspath_count(const void *, u_int16_t); u_int16_t aspath_neighbor(struct aspath *); int aspath_loopfree(struct aspath *, u_int16_t); int aspath_compare(struct aspath *, struct aspath *); u_int32_t aspath_hash(const void *, u_int16_t); struct aspath *aspath_prepend(struct aspath *, u_int16_t, int); int aspath_snprint(char *, size_t, void *, u_int16_t); int aspath_asprint(char **, void *, u_int16_t); size_t aspath_strlen(void *, u_int16_t); int aspath_match(struct aspath *, enum as_spec, u_int16_t); int community_match(void *, u_int16_t, int, int); int community_set(struct attr *, int, int); /* rde_rib.c */ void path_init(u_int32_t); void path_shutdown(void); void path_update(struct rde_peer *, struct rde_aspath *, struct bgpd_addr *, int); int path_compare(struct rde_aspath *, struct rde_aspath *); struct rde_aspath *path_lookup(struct rde_aspath *, struct rde_peer *); void path_remove(struct rde_aspath *); void path_updateall(struct rde_aspath *, enum nexthop_state); void path_destroy(struct rde_aspath *); int path_empty(struct rde_aspath *); struct rde_aspath *path_copy(struct rde_aspath *); struct rde_aspath *path_get(void); void path_put(struct rde_aspath *); #define PREFIX_SIZE(x) (((x) + 7) / 8 + 1) int prefix_compare(const struct bgpd_addr *, const struct bgpd_addr *, int); struct prefix *prefix_get(struct rde_peer *, struct bgpd_addr *, int); struct pt_entry *prefix_add(struct rde_aspath *, struct bgpd_addr *, int); struct pt_entry *prefix_move(struct rde_aspath *, struct prefix *); void prefix_remove(struct rde_peer *, struct bgpd_addr *, int); int prefix_write(u_char *, int, struct bgpd_addr *, u_int8_t); struct prefix *prefix_bypeer(struct pt_entry *, struct rde_peer *); void prefix_updateall(struct rde_aspath *, enum nexthop_state); void prefix_destroy(struct prefix *); void prefix_network_clean(struct rde_peer *, time_t); void nexthop_init(u_int32_t); void nexthop_shutdown(void); void nexthop_modify(struct rde_aspath *, struct bgpd_addr *, int, sa_family_t); void nexthop_link(struct rde_aspath *); void nexthop_unlink(struct rde_aspath *); void nexthop_update(struct kroute_nexthop *); struct nexthop *nexthop_get(struct bgpd_addr *); int nexthop_compare(struct nexthop *, struct nexthop *); /* rde_decide.c */ void prefix_evaluate(struct prefix *, struct pt_entry *); void up_init(struct rde_peer *); void up_down(struct rde_peer *); void up_generate_updates(struct rde_peer *, struct prefix *, struct prefix *); void up_generate_default(struct rde_peer *, sa_family_t); int up_dump_prefix(u_char *, int, struct uplist_prefix *, struct rde_peer *); int up_dump_attrnlri(u_char *, int, struct rde_peer *); void up_dump_upcall(struct pt_entry *, void *); /* rde_prefix.c */ void pt_init(void); void pt_shutdown(void); int pt_empty(struct pt_entry *); void pt_getaddr(struct pt_entry *, struct bgpd_addr *); struct pt_entry *pt_get(struct bgpd_addr *, int); struct pt_entry *pt_add(struct bgpd_addr *, int); void pt_remove(struct pt_entry *); struct pt_entry *pt_lookup(struct bgpd_addr *); void pt_dump(void (*)(struct pt_entry *, void *), void *, sa_family_t); /* rde_filter.c */ enum filter_actions rde_filter(struct rde_peer *, struct rde_aspath *, struct bgpd_addr *, u_int8_t, enum directions); void rde_apply_set(struct rde_aspath *, struct filter_set *, sa_family_t, struct rde_peer *, enum directions); int rde_filter_community(struct rde_aspath *, int, int); #endif /* __RDE_H__ */