249 lines
7.8 KiB
C
249 lines
7.8 KiB
C
/*
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* BIRD Internet Routing Daemon -- Protocols
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*
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* (c) 1998--1999 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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struct iface;
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struct ifa;
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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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/*
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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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unsigned debug; /* Default debugging flags */
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int priority; /* Protocol priority (usually 0) */
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int name_counter; /* Counter for automatic name generation */
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int startup_counter; /* Number of instances waiting for initialization */
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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 */
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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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};
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void protos_build(void);
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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 *);
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void protos_start(void);
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void protos_dump_all(void);
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void protos_shutdown(void);
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extern list protocol_list;
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/*
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* Known protocols
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*/
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extern struct protocol proto_device;
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extern struct protocol proto_rip;
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extern struct protocol proto_static;
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extern struct protocol proto_ospf;
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extern struct protocol proto_pipe;
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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 *proto; /* Protocol */
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char *name;
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unsigned debug, preference, disabled; /* Generic parameters */
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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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/* Protocol-specific data follow... */
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};
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struct proto {
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node n;
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struct protocol *proto; /* Protocol */
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struct proto_config *cf; /* Configuration data */
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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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unsigned debug; /* Debugging flags */
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unsigned preference; /* Default route preference */
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unsigned disabled; /* Manually disabled */
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unsigned proto_state; /* Protocol state machine (see below) */
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unsigned core_state; /* Core state machine (see below) */
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unsigned core_goal; /* State we want to reach (see below) */
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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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*/
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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 network *net, struct rte *new, struct rte *old, struct ea_list *tmpa);
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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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/*
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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_better Compare two rte's and decide which one is better (1=first, 0=second).
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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_better)(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 filter *in_filter; /* Input filter */
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struct filter *out_filter; /* Output filter */
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struct announce_hook *ahooks; /* Announcement hooks for this protocol */
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/* Hic sunt protocol-specific data */
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};
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void proto_build(struct proto_config *);
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void *proto_new(struct proto_config *, unsigned size);
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void *proto_config_new(struct protocol *, unsigned size);
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extern list 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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#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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* 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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* 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 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 *, struct rtable *);
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/*
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* Callback to sysdep code when shutdown is finished
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*/
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void protos_shutdown_notify(void);
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#endif
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