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bird/nest/protocol.h
Martin Mares 96d8e3bff2 Added protocol debugging flags (protocol.h: D_xxx), parsing of them 
in configuration files and commands for manipulating them.

Current debug message policy:

   o  D_STATES, D_ROUTES and D_FILTERS are handled in generic code.
   o  Other debug flags should be handled in the protocols and whenever
      the flag is set, the corresponding messages should be printed
      using calls to log(L_TRACE, ...), each message prefixed with
      the name of the protocol instance. These messages should cover
      the whole normal operation of the protocol and should be useful
      for an administrator trying to understand what does the protocol
      behave on his network or who is attempting to diagnose network
      problems. If your messages don't fit to the categories I've defined,
      feel free to add your own ones (by adding them to protocol.h
      and on two places in nest/config.Y), but please try to keep the
      categories as general as possible (i.e., not tied to your protocol).
   o  Internal debug messages not interesting even to an experienced
      user should be printed by calling DBG() which is either void or
      a call to debug() depending on setting of the LOCAL_DEBUG symbol
      at the top of your source.
   o  Dump functions (proto->dump etc.) should call debug() to print
      their messages.
   o  If you are doing any internal consistency checks, use ASSERT
      or bug().
   o  Nobody shall ever call printf() or any other stdio functions.

Also please try to log any protocol errors you encounter and tag them
with the appropriate message category (usually L_REMOTE or L_AUTH). Always
carefully check contents of any message field you receive and verify all
IP addresses you work with (by calling ipa_classify() or by using the
neighbour cache if you want to check direct connectedness as well).
2000-03-07 20:49:48 +00:00

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/*
* 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 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 */
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); /* Get route information (for `show route' command) */
void (*show_route_data)(struct rte *); /* Print verbose route information (`show route' again) */
};
void protos_build(void);
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);
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 *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 */
/*
* 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 *, 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] Filtering of routes */
#define D_EVENTS 8 /* Protocol events */
#define D_PACKETS 16 /* 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
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