mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-12-22 01:31:55 +00:00
9e0e485e50
make_tmp_attrs Convert inline attributes to ea_list store_tmp_attrs Convert ea_list to inline attributes import_control Pre-import decisions
229 lines
7.1 KiB
C
229 lines
7.1 KiB
C
/*
|
|
* 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 rte;
|
|
struct neighbor;
|
|
struct rta;
|
|
struct network;
|
|
struct proto_config;
|
|
struct config;
|
|
struct proto;
|
|
struct event;
|
|
|
|
/*
|
|
* 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 */
|
|
|
|
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;
|
|
|
|
/*
|
|
* 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 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.
|
|
* 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 *new, struct iface *old);
|
|
void (*rt_notify)(struct proto *, struct network *net, struct rte *new, struct rte *old);
|
|
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; /* Routing table we're connected to */
|
|
struct filter *in_filter; /* Input filter */
|
|
struct filter *out_filter; /* Output filter */
|
|
|
|
/* 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);
|
|
|
|
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;
|
|
|
|
/*
|
|
* Callback to sysdep code when shutdown is finished
|
|
*/
|
|
|
|
void protos_shutdown_notify(void);
|
|
|
|
#endif
|