diff options
Diffstat (limited to 'nest/protocol.h')
| -rw-r--r-- | nest/protocol.h | 128 |
1 files changed, 108 insertions, 20 deletions
diff --git a/nest/protocol.h b/nest/protocol.h index f516f0f..c972060 100644 --- a/nest/protocol.h +++ b/nest/protocol.h @@ -1,7 +1,7 @@ /* * BIRD Internet Routing Daemon -- Protocols * - * (c) 1998 Martin Mares <mj@ucw.cz> + * (c) 1998--1999 Martin Mares <mj@ucw.cz> * * Can be freely distributed and used under the terms of the GNU GPL. */ @@ -17,6 +17,9 @@ struct rte; struct neighbor; struct rtattr; struct network; +struct proto_config; +struct config; +struct proto; /* * Routing Protocol @@ -27,15 +30,19 @@ struct protocol { char *name; unsigned debug; /* Default debugging flags */ - void (*init)(struct protocol *); /* Boot time */ - void (*preconfig)(struct protocol *); /* Just before configuring */ - void (*postconfig)(struct protocol *); /* After configuring */ + 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 */ + int (*start)(struct proto *); /* Start the instance */ + int (*shutdown)(struct proto *); /* Stop the instance */ }; void protos_build(void); -void protos_init(void); -void protos_preconfig(void); -void protos_postconfig(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); @@ -53,47 +60,128 @@ extern struct protocol proto_static; * 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 */ + + /* Protocol-specific data follow... */ +}; + struct proto { node n; struct protocol *proto; /* Protocol */ - char *name; /* Name of this instance */ + struct proto_config *cf; /* Configuration data */ + pool *pool; /* Pool containing local objects */ + unsigned debug; /* Debugging flags */ - pool *pool; /* Local objects */ unsigned preference; /* Default route preference */ - unsigned state; /* PRS_... */ unsigned disabled; /* Manually disabled */ + unsigned proto_state; /* Protocol state machine (see below) */ + unsigned core_state; /* Core state machine (see below) */ 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); - void (*dump)(struct proto *); /* Debugging dump */ - void (*start)(struct proto *); /* Start the instance */ - void (*shutdown)(struct proto *, int time); /* Stop the instance */ int (*rta_same)(struct rtattr *, struct rtattr *); int (*rte_better)(struct rte *, struct rte *); void (*rte_insert)(struct network *, struct rte *); void (*rte_remove)(struct network *, struct rte *); - /* Reconfigure function? */ /* Input/output filters */ /* Connection to routing tables? */ /* Hic sunt protocol-specific data */ }; -#define PRS_DOWN 0 /* Inactive */ -#define PRS_STARTING 1 -#define PRS_UP 2 - -void *proto_new(struct protocol *, unsigned size); +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, inactive_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 *cf_dev_proto; +extern struct proto_config *cf_dev_proto; #endif |