094d2bdb79
Allows to send and receive multiple routes for one network by one BGP session. Also contains necessary core changes to support this (routing tables accepting several routes for one network from one protocol). It needs some more cleanup before merging to the master branch.
419 lines
16 KiB
C
419 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 routes 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 rte_src *main_source; /* Primary route source */
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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_CMD_SHUTDOWN 0x13 /* Result of global shutdown */
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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 */
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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
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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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