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/*
* BIRD Internet Routing Daemon -- Protocols
*
* (c) 1998--1999 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"
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 symbol;
/*
* Routing Protocol
*/
struct protocol {
node n;
char *name;
unsigned debug; /* Default debugging flags */
int priority; /* Protocol priority (usually 0) */
int name_counter; /* Counter for automatic name generation */
int startup_counter; /* Number of instances waiting for initialization */
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 */
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 protos_build(void);
void protos_preconfig(struct config *);
void protos_postconfig(struct config *);
void protos_commit(struct config *);
void protos_start(void);
void protos_dump_all(void);
void protos_shutdown(void);
extern list protocol_list;
/*
* Known protocols
*/
extern struct protocol proto_device;
extern struct protocol proto_rip;
extern struct protocol proto_static;
extern struct protocol proto_ospf;
extern struct protocol proto_pipe;
/*
* Routing Protocol Instance
*/
struct proto_config {
node n;
struct config *global; /* Global configuration data */
struct protocol *proto; /* Protocol */
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;
struct protocol *proto; /* Protocol */
struct proto_config *cf; /* Configuration data */
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 */
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) */
/*
* 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 *tmpa);
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_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 *);
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 */
/* Hic sunt protocol-specific data */
};
void proto_build(struct proto_config *);
void *proto_new(struct proto_config *, unsigned size);
void *proto_config_new(struct protocol *, unsigned size);
void proto_show(struct symbol *);
extern list 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
/*
* 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 *);
/*
* Callback to sysdep code when shutdown is finished
*/
void protos_shutdown_notify(void);
#endif
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