/* * BIRD Internet Routing Daemon -- Protocols * * (c) 1998--2000 Martin Mares <mj@ucw.cz> * * Can be freely distributed and used under the terms of the GNU GPL. */ #ifndef _BIRD_PROTOCOL_H_ #define _BIRD_PROTOCOL_H_ #include "lib/lists.h" #include "lib/resource.h" #include "lib/timer.h" struct iface; struct ifa; struct rte; struct neighbor; struct rta; struct network; struct proto_config; struct config; struct proto; struct event; struct ea_list; struct eattr; struct symbol; /* * Routing Protocol */ struct protocol { node n; char *name; char *template; /* Template for automatic generation of names */ int name_counter; /* Counter for automatic name generation */ int attr_class; /* Attribute class known to this protocol */ void (*preconfig)(struct protocol *, struct config *); /* Just before configuring */ void (*postconfig)(struct proto_config *); /* After configuring each instance */ struct proto * (*init)(struct proto_config *); /* Create new instance */ int (*reconfigure)(struct proto *, struct proto_config *); /* Try to reconfigure instance, returns success */ void (*dump)(struct proto *); /* Debugging dump */ void (*dump_attrs)(struct rte *); /* Dump protocol-dependent attributes */ int (*start)(struct proto *); /* Start the instance */ int (*shutdown)(struct proto *); /* Stop the instance */ void (*get_status)(struct proto *, byte *buf); /* Get instance status (for `show protocols' command) */ void (*get_route_info)(struct rte *, byte *buf, struct ea_list *attrs); /* Get route information (for `show route' command) */ int (*get_attr)(struct eattr *, byte *buf); /* ASCIIfy dynamic attribute (returns GA_*) */ }; void protos_build(void); void proto_build(struct protocol *); void protos_preconfig(struct config *); void protos_postconfig(struct config *); void protos_commit(struct config *new, struct config *old, int force_restart); void protos_dump_all(void); #define GA_UNKNOWN 0 /* Attribute not recognized */ #define GA_NAME 1 /* Result = name */ #define GA_FULL 2 /* Result = both name and value */ /* * Known protocols */ extern struct protocol proto_device, proto_rip, proto_static, proto_ospf, proto_pipe, proto_bgp; /* * Routing Protocol Instance */ struct proto_config { node n; struct config *global; /* Global configuration data */ struct protocol *protocol; /* Protocol */ struct proto *proto; /* Instance we've created */ char *name; unsigned debug, preference, disabled; /* Generic parameters */ struct rtable_config *table; /* Table we're attached to */ struct filter *in_filter, *out_filter; /* Attached filters */ /* Protocol-specific data follow... */ }; struct proto { node n; /* Node in *_proto_list */ node glob_node; /* Node in global proto_list */ struct protocol *proto; /* Protocol */ struct proto_config *cf; /* Configuration data */ struct proto_config *cf_new; /* Configuration we want to switch to after shutdown (NULL=delete) */ pool *pool; /* Pool containing local objects */ struct event *attn; /* "Pay attention" event */ char *name; /* Name of this instance (== cf->name) */ unsigned debug; /* Debugging flags */ unsigned preference; /* Default route preference */ int min_scope; /* Minimal route scope accepted */ unsigned disabled; /* Manually disabled */ unsigned proto_state; /* Protocol state machine (see below) */ unsigned core_state; /* Core state machine (see below) */ unsigned core_goal; /* State we want to reach (see below) */ unsigned reconfiguring; /* We're shutting down due to reconfiguration */ u32 hash_key; /* Random key used for hashing of neighbors */ bird_clock_t last_state_change; /* Time of last state transition */ char *last_state_name_announced; /* Last state name we've announced to the user */ /* * General protocol hooks: * * if_notify Notify protocol about interface state changes. * ifa_notify Notify protocol about interface address changes. * rt_notify Notify protocol about routing table updates. * neigh_notify Notify protocol about neighbor cache events. * make_tmp_attrs Construct ea_list from private attrs stored in rte. * store_tmp_attrs Store private attrs back to the rte. * import_control Called as the first step of the route importing process. * It can construct a new rte, add private attributes and * decide whether the route shall be imported: 1=yes, -1=no, * 0=process it through the import filter set by the user. */ void (*if_notify)(struct proto *, unsigned flags, struct iface *i); void (*ifa_notify)(struct proto *, unsigned flags, struct ifa *a); void (*rt_notify)(struct proto *, struct network *net, struct rte *new, struct rte *old, struct ea_list *attrs); void (*neigh_notify)(struct neighbor *neigh); struct ea_list *(*make_tmp_attrs)(struct rte *rt, struct linpool *pool); void (*store_tmp_attrs)(struct rte *rt, struct ea_list *attrs); int (*import_control)(struct proto *, struct rte **rt, struct ea_list **attrs, struct linpool *pool); /* * Routing entry hooks (called only for rte's belonging to this protocol): * * rte_better Compare two rte's and decide which one is better (1=first, 0=second). * rte_same Compare two rte's and decide whether they are identical (1=yes, 0=no). * rte_insert Called whenever a rte is inserted to a routing table. * rte_remove Called whenever a rte is removed from the routing table. */ int (*rte_better)(struct rte *, struct rte *); int (*rte_same)(struct rte *, struct rte *); void (*rte_insert)(struct network *, struct rte *); void (*rte_remove)(struct network *, struct rte *); struct rtable *table; /* Our primary routing table */ struct filter *in_filter; /* Input filter */ struct filter *out_filter; /* Output filter */ struct announce_hook *ahooks; /* Announcement hooks for this protocol */ struct fib_iterator *feed_iterator; /* Routing table iterator used during protocol feeding */ struct announce_hook *feed_ahook; /* Announce hook we currently feed */ /* Hic sunt protocol-specific data */ }; void *proto_new(struct proto_config *, unsigned size); void *proto_config_new(struct protocol *, unsigned size); void proto_show(struct symbol *, int); struct proto *proto_get_named(struct symbol *, struct protocol *); void proto_xxable(char *, int); void proto_debug(char *, unsigned int); extern list active_proto_list; /* * Each protocol instance runs two different state machines: * * [P] The protocol machine: (implemented inside protocol) * * DOWN ----> START * ^ | * | V * STOP <---- UP * * States: DOWN Protocol is down and it's waiting for the core * requesting protocol start. * START Protocol is waiting for connection with the rest * of the network and it's not willing to accept * packets. When it connects, it goes to UP state. * UP Protocol is up and running. When the network * connection breaks down or the core requests * protocol to be terminated, it goes to STOP state. * STOP Protocol is disconnecting from the network. * After it disconnects, it returns to DOWN state. * * In: start() Called in DOWN state to request protocol startup. * Returns new state: either UP or START (in this * case, the protocol will notify the core when it * finally comes UP). * stop() Called in START, UP or STOP state to request * protocol shutdown. Returns new state: either * DOWN or STOP (in this case, the protocol will * notify the core when it finally comes DOWN). * * Out: proto_notify_state() -- called by protocol instance when * it does any state transition not covered by * return values of start() and stop(). This includes * START->UP (delayed protocol startup), UP->STOP * (spontaneous shutdown) and STOP->DOWN (delayed * shutdown). */ #define PS_DOWN 0 #define PS_START 1 #define PS_UP 2 #define PS_STOP 3 void proto_notify_state(struct proto *p, unsigned state); /* * [F] The feeder machine: (implemented in core routines) * * HUNGRY ----> FEEDING * ^ | * | V * FLUSHING <---- HAPPY * * States: HUNGRY Protocol either administratively down (i.e., * disabled by the user) or temporarily down * (i.e., [P] is not UP) * FEEDING The protocol came up and we're feeding it * initial routes. [P] is UP. * HAPPY The protocol is up and it's receiving normal * routing updates. [P] is UP. * FLUSHING The protocol is down and we're removing its * routes from the table. [P] is STOP or DOWN. * * Normal lifecycle of a protocol looks like: * * HUNGRY/DOWN --> HUNGRY/START --> HUNGRY/UP --> * FEEDING/UP --> HAPPY/UP --> FLUSHING/STOP|DOWN --> * HUNGRY/STOP|DOWN --> HUNGRY/DOWN */ #define FS_HUNGRY 0 #define FS_FEEDING 1 #define FS_HAPPY 2 #define FS_FLUSHING 3 /* * Debugging flags */ #define D_STATES 1 /* [core] State transitions */ #define D_ROUTES 2 /* [core] Routes passed by the filters */ #define D_FILTERS 4 /* [core] Routes rejected by the filters */ #define D_IFACES 8 /* [core] Interface events */ #define D_EVENTS 16 /* Protocol events */ #define D_PACKETS 32 /* Packets sent/received */ /* * Known unique protocol instances as referenced by config routines */ extern struct proto_config *cf_dev_proto; /* * Route Announcement Hook */ struct announce_hook { node n; struct rtable *table; struct proto *proto; struct announce_hook *next; /* Next hook for the same protocol */ }; struct announce_hook *proto_add_announce_hook(struct proto *, struct rtable *); #endif