416 lines
16 KiB
C
416 lines
16 KiB
C
/*
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* BIRD Internet Routing Daemon -- Protocols
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*
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* (c) 1998--2000 Martin Mares <mj@ucw.cz>
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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_PROTOCOL_H_
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#define _BIRD_PROTOCOL_H_
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#include "lib/lists.h"
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#include "lib/resource.h"
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#include "lib/timer.h"
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#include "conf/conf.h"
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struct iface;
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struct ifa;
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struct rtable;
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struct rte;
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struct neighbor;
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struct rta;
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struct network;
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struct proto_config;
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struct config;
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struct proto;
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struct event;
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struct ea_list;
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struct eattr;
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struct symbol;
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/*
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* Routing Protocol
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*/
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struct protocol {
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node n;
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char *name;
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char *template; /* Template for automatic generation of names */
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int name_counter; /* Counter for automatic name generation */
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int attr_class; /* Attribute class known to this protocol */
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int multitable; /* Protocol handles all announce hooks itself */
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unsigned preference; /* Default protocol preference */
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void (*preconfig)(struct protocol *, struct config *); /* Just before configuring */
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void (*postconfig)(struct proto_config *); /* After configuring each instance */
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struct proto * (*init)(struct proto_config *); /* Create new instance */
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int (*reconfigure)(struct proto *, struct proto_config *); /* Try to reconfigure instance, returns success */
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void (*dump)(struct proto *); /* Debugging dump */
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void (*dump_attrs)(struct rte *); /* Dump protocol-dependent attributes */
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int (*start)(struct proto *); /* Start the instance */
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int (*shutdown)(struct proto *); /* Stop the instance */
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void (*cleanup)(struct proto *); /* Called after shutdown when protocol became hungry/down */
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void (*get_status)(struct proto *, byte *buf); /* Get instance status (for `show protocols' command) */
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void (*get_route_info)(struct rte *, byte *buf, struct ea_list *attrs); /* Get route information (for `show route' command) */
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int (*get_attr)(struct eattr *, byte *buf, int buflen); /* ASCIIfy dynamic attribute (returns GA_*) */
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void (*show_proto_info)(struct proto *); /* Show protocol info (for `show protocols all' command) */
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void (*copy_config)(struct proto_config *, struct proto_config *); /* Copy config from given protocol instance */
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};
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void protos_build(void);
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void proto_build(struct protocol *);
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void protos_preconfig(struct config *);
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void protos_postconfig(struct config *);
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void protos_commit(struct config *new, struct config *old, int force_restart, int type);
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void protos_dump_all(void);
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#define GA_UNKNOWN 0 /* Attribute not recognized */
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#define GA_NAME 1 /* Result = name */
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#define GA_FULL 2 /* Result = both name and value */
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/*
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* Known protocols
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*/
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extern struct protocol
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proto_device, proto_radv, proto_rip, proto_static,
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proto_ospf, proto_pipe, proto_bgp;
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/*
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* Routing Protocol Instance
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*/
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struct proto_config {
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node n;
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struct config *global; /* Global configuration data */
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struct protocol *protocol; /* Protocol */
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struct proto *proto; /* Instance we've created */
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char *name;
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char *dsc;
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int class; /* SYM_PROTO or SYM_TEMPLATE */
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u32 debug, mrtdump; /* Debugging bitfields, both use D_* constants */
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unsigned preference, disabled; /* Generic parameters */
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u32 router_id; /* Protocol specific router ID */
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struct rtable_config *table; /* Table we're attached to */
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struct filter *in_filter, *out_filter; /* Attached filters */
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struct proto_limit *in_limit; /* Limit for importing routes from protocol */
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struct proto_limit *out_limit; /* Limit for exporting routes to protocol */
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/* Check proto_reconfigure() and proto_copy_config() after changing struct proto_config */
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/* Protocol-specific data follow... */
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};
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/* Protocol statistics */
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struct proto_stats {
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/* Import - from protocol to core */
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u32 imp_routes; /* Number of routes successfully imported to the (adjacent) routing table */
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u32 pref_routes; /* Number of routes that are preferred, sum over all routing table */
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u32 imp_updates_received; /* Number of route updates received */
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u32 imp_updates_invalid; /* Number of route updates rejected as invalid */
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u32 imp_updates_filtered; /* Number of route updates rejected by filters */
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u32 imp_updates_ignored; /* Number of route updates rejected as already in route table */
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u32 imp_updates_accepted; /* Number of route updates accepted and imported */
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u32 imp_withdraws_received; /* Number of route withdraws received */
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u32 imp_withdraws_invalid; /* Number of route withdraws rejected as invalid */
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u32 imp_withdraws_ignored; /* Number of route withdraws rejected as already not in route table */
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u32 imp_withdraws_accepted; /* Number of route withdraws accepted and processed */
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/* Export - from core to protocol */
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u32 exp_routes; /* Number of routes successfully exported to the protocol */
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u32 exp_updates_received; /* Number of route updates received */
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u32 exp_updates_rejected; /* Number of route updates rejected by protocol */
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u32 exp_updates_filtered; /* Number of route updates rejected by filters */
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u32 exp_updates_accepted; /* Number of route updates accepted and exported */
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u32 exp_withdraws_received; /* Number of route withdraws received */
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u32 exp_withdraws_accepted; /* Number of route withdraws accepted and processed */
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};
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struct proto {
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node n; /* Node in *_proto_list */
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node glob_node; /* Node in global proto_list */
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struct protocol *proto; /* Protocol */
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struct proto_config *cf; /* Configuration data */
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struct proto_config *cf_new; /* Configuration we want to switch to after shutdown (NULL=delete) */
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pool *pool; /* Pool containing local objects */
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struct event *attn; /* "Pay attention" event */
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char *name; /* Name of this instance (== cf->name) */
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u32 debug; /* Debugging flags */
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u32 mrtdump; /* MRTDump flags */
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unsigned preference; /* Default route preference */
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byte accept_ra_types; /* Which types of route announcements are accepted (RA_OPTIMAL or RA_ANY) */
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byte disabled; /* Manually disabled */
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byte proto_state; /* Protocol state machine (PS_*, see below) */
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byte core_state; /* Core state machine (FS_*, see below) */
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byte core_goal; /* State we want to reach (FS_*, see below) */
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byte reconfiguring; /* We're shutting down due to reconfiguration */
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byte refeeding; /* We are refeeding (valid only if core_state == FS_FEEDING) */
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byte flushing; /* Protocol is flushed in current flush loop round */
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byte down_sched; /* Shutdown is scheduled for later (PDS_*) */
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byte down_code; /* Reason for shutdown (PDC_* codes) */
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u32 hash_key; /* Random key used for hashing of neighbors */
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bird_clock_t last_state_change; /* Time of last state transition */
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char *last_state_name_announced; /* Last state name we've announced to the user */
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struct proto_stats stats; /* Current protocol statistics */
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/*
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* General protocol hooks:
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*
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* if_notify Notify protocol about interface state changes.
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* ifa_notify Notify protocol about interface address changes.
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* rt_notify Notify protocol about routing table updates.
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* neigh_notify Notify protocol about neighbor cache events.
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* make_tmp_attrs Construct ea_list from private attrs stored in rte.
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* store_tmp_attrs Store private attrs back to the rte.
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* import_control Called as the first step of the route importing process.
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* It can construct a new rte, add private attributes and
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* decide whether the route shall be imported: 1=yes, -1=no,
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* 0=process it through the import filter set by the user.
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* reload_routes Request protocol to reload all its routes to the core
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* (using rte_update()). Returns: 0=reload cannot be done,
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* 1= reload is scheduled and will happen (asynchronously).
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*/
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void (*if_notify)(struct proto *, unsigned flags, struct iface *i);
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void (*ifa_notify)(struct proto *, unsigned flags, struct ifa *a);
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void (*rt_notify)(struct proto *, struct rtable *table, struct network *net, struct rte *new, struct rte *old, struct ea_list *attrs);
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void (*neigh_notify)(struct neighbor *neigh);
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struct ea_list *(*make_tmp_attrs)(struct rte *rt, struct linpool *pool);
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void (*store_tmp_attrs)(struct rte *rt, struct ea_list *attrs);
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int (*import_control)(struct proto *, struct rte **rt, struct ea_list **attrs, struct linpool *pool);
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int (*reload_routes)(struct proto *);
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/*
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* Routing entry hooks (called only for rte's belonging to this protocol):
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*
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* rte_recalculate Called at the beginning of the best route selection
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* rte_better Compare two rte's and decide which one is better (1=first, 0=second).
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* rte_same Compare two rte's and decide whether they are identical (1=yes, 0=no).
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* rte_insert Called whenever a rte is inserted to a routing table.
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* rte_remove Called whenever a rte is removed from the routing table.
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*/
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int (*rte_recalculate)(struct rtable *, struct network *, struct rte *, struct rte *, struct rte *);
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int (*rte_better)(struct rte *, struct rte *);
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int (*rte_same)(struct rte *, struct rte *);
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void (*rte_insert)(struct network *, struct rte *);
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void (*rte_remove)(struct network *, struct rte *);
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struct rtable *table; /* Our primary routing table */
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struct announce_hook *main_ahook; /* Primary announcement hook */
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struct announce_hook *ahooks; /* Announcement hooks for this protocol */
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struct fib_iterator *feed_iterator; /* Routing table iterator used during protocol feeding */
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struct announce_hook *feed_ahook; /* Announce hook we currently feed */
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/* Hic sunt protocol-specific data */
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};
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struct proto_spec {
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void *ptr;
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int patt;
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};
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#define PDS_DISABLE 1 /* Proto disable scheduled */
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#define PDS_RESTART 2 /* Proto restart scheduled */
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#define PDC_CF_REMOVE 0x01 /* Removed in new config */
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#define PDC_CF_DISABLE 0x02 /* Disabled in new config */
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#define PDC_CF_RESTART 0x03 /* Restart due to reconfiguration */
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#define PDC_CMD_DISABLE 0x11 /* Result of disable command */
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#define PDC_CMD_RESTART 0x12 /* Result of restart command */
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#define PDC_IN_LIMIT_HIT 0x21 /* Route import limit reached */
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#define PDC_OUT_LIMIT_HIT 0x22 /* Route export limit reached - not implemented */
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void *proto_new(struct proto_config *, unsigned size);
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void *proto_config_new(struct protocol *, unsigned size, int class);
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void proto_copy_config(struct proto_config *dest, struct proto_config *src);
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void proto_request_feeding(struct proto *p);
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static inline void
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proto_copy_rest(struct proto_config *dest, struct proto_config *src, unsigned size)
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{ memcpy(dest + 1, src + 1, size - sizeof(struct proto_config)); }
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void proto_show_limit(struct proto_limit *l, const char *dsc);
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void proto_show_basic_info(struct proto *p);
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void proto_cmd_show(struct proto *, unsigned int, int);
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void proto_cmd_disable(struct proto *, unsigned int, int);
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void proto_cmd_enable(struct proto *, unsigned int, int);
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void proto_cmd_restart(struct proto *, unsigned int, int);
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void proto_cmd_reload(struct proto *, unsigned int, int);
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void proto_cmd_debug(struct proto *, unsigned int, int);
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void proto_cmd_mrtdump(struct proto *, unsigned int, int);
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void proto_apply_cmd(struct proto_spec ps, void (* cmd)(struct proto *, unsigned int, int), int restricted, unsigned int arg);
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struct proto *proto_get_named(struct symbol *, struct protocol *);
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#define CMD_RELOAD 0
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#define CMD_RELOAD_IN 1
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#define CMD_RELOAD_OUT 2
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static inline u32
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proto_get_router_id(struct proto_config *pc)
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{
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return pc->router_id ? pc->router_id : pc->global->router_id;
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}
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extern list active_proto_list;
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/*
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* Each protocol instance runs two different state machines:
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*
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* [P] The protocol machine: (implemented inside protocol)
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*
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* DOWN ----> START
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* ^ |
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* | V
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* STOP <---- UP
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*
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* States: DOWN Protocol is down and it's waiting for the core
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* requesting protocol start.
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* START Protocol is waiting for connection with the rest
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* of the network and it's not willing to accept
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* packets. When it connects, it goes to UP state.
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* UP Protocol is up and running. When the network
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* connection breaks down or the core requests
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* protocol to be terminated, it goes to STOP state.
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* STOP Protocol is disconnecting from the network.
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* After it disconnects, it returns to DOWN state.
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*
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* In: start() Called in DOWN state to request protocol startup.
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* Returns new state: either UP or START (in this
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* case, the protocol will notify the core when it
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* finally comes UP).
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* stop() Called in START, UP or STOP state to request
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* protocol shutdown. Returns new state: either
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* DOWN or STOP (in this case, the protocol will
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* notify the core when it finally comes DOWN).
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*
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* Out: proto_notify_state() -- called by protocol instance when
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* it does any state transition not covered by
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* return values of start() and stop(). This includes
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* START->UP (delayed protocol startup), UP->STOP
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* (spontaneous shutdown) and STOP->DOWN (delayed
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* shutdown).
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*/
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#define PS_DOWN 0
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#define PS_START 1
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#define PS_UP 2
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#define PS_STOP 3
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void proto_notify_state(struct proto *p, unsigned state);
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/*
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* [F] The feeder machine: (implemented in core routines)
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*
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* HUNGRY ----> FEEDING
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* ^ |
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* | V
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* FLUSHING <---- HAPPY
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*
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* States: HUNGRY Protocol either administratively down (i.e.,
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* disabled by the user) or temporarily down
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* (i.e., [P] is not UP)
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* FEEDING The protocol came up and we're feeding it
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* initial routes. [P] is UP.
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* HAPPY The protocol is up and it's receiving normal
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* routing updates. [P] is UP.
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* FLUSHING The protocol is down and we're removing its
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* routes from the table. [P] is STOP or DOWN.
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*
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* Normal lifecycle of a protocol looks like:
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*
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* HUNGRY/DOWN --> HUNGRY/START --> HUNGRY/UP -->
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* FEEDING/UP --> HAPPY/UP --> FLUSHING/STOP|DOWN -->
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* HUNGRY/STOP|DOWN --> HUNGRY/DOWN
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*
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* Sometimes, protocol might switch from HAPPY/UP to FEEDING/UP
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* if it wants to refeed the routes (for example BGP does so
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* as a result of received ROUTE-REFRESH request).
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*/
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#define FS_HUNGRY 0
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#define FS_FEEDING 1
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#define FS_HAPPY 2
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#define FS_FLUSHING 3
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/*
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* Debugging flags
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*/
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#define D_STATES 1 /* [core] State transitions */
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#define D_ROUTES 2 /* [core] Routes passed by the filters */
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#define D_FILTERS 4 /* [core] Routes rejected by the filters */
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#define D_IFACES 8 /* [core] Interface events */
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#define D_EVENTS 16 /* Protocol events */
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#define D_PACKETS 32 /* Packets sent/received */
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/*
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* MRTDump flags
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*/
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#define MD_STATES 1 /* Protocol state changes (BGP4MP_MESSAGE_AS4) */
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#define MD_MESSAGES 2 /* Protocol packets (BGP4MP_MESSAGE_AS4) */
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/*
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* Known unique protocol instances as referenced by config routines
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*/
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extern struct proto_config *cf_dev_proto;
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/*
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* Protocol limits
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*/
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#define PLA_WARN 1 /* Issue log warning */
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#define PLA_BLOCK 2 /* Block new routes */
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#define PLA_RESTART 4 /* Force protocol restart */
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#define PLA_DISABLE 5 /* Shutdown and disable protocol */
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#define PLS_INITIAL 0 /* Initial limit state after protocol start */
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#define PLS_ACTIVE 1 /* Limit was hit */
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#define PLS_BLOCKED 2 /* Limit is active and blocking new routes */
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struct proto_limit {
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u32 limit; /* Maximum number of prefixes */
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byte action; /* Action to take (PLA_*) */
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byte state; /* State of limit (PLS_*) */
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};
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void proto_notify_limit(struct announce_hook *ah, struct proto_limit *l, u32 rt_count);
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static inline void proto_reset_limit(struct proto_limit *l)
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{
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if (l)
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l->state = PLS_INITIAL;
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}
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/*
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* Route Announcement Hook
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*/
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struct announce_hook {
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node n;
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struct rtable *table;
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struct proto *proto;
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struct filter *in_filter; /* Input filter */
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struct filter *out_filter; /* Output filter */
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struct proto_limit *in_limit; /* Input limit */
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struct proto_limit *out_limit; /* Output limit */
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struct proto_stats *stats; /* Per-table protocol statistics */
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struct announce_hook *next; /* Next hook for the same protocol */
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};
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struct announce_hook *proto_add_announce_hook(struct proto *p, struct rtable *t, struct proto_stats *stats);
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struct announce_hook *proto_find_announce_hook(struct proto *p, struct rtable *t);
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#endif
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