1: /*
2: * BIRD Internet Routing Daemon -- Protocols
3: *
4: * (c) 1998--2000 Martin Mares <mj@ucw.cz>
5: *
6: * Can be freely distributed and used under the terms of the GNU GPL.
7: */
8:
9: #ifndef _BIRD_PROTOCOL_H_
10: #define _BIRD_PROTOCOL_H_
11:
12: #include "lib/lists.h"
13: #include "lib/resource.h"
14: #include "lib/timer.h"
15: #include "nest/route.h"
16: #include "conf/conf.h"
17:
18: struct iface;
19: struct ifa;
20: struct rtable;
21: struct rte;
22: struct neighbor;
23: struct rta;
24: struct network;
25: struct proto_config;
26: struct config;
27: struct proto;
28: struct event;
29: struct ea_list;
30: struct eattr;
31: struct symbol;
32:
33: /*
34: * Routing Protocol
35: */
36:
37: struct protocol {
38: node n;
39: char *name;
40: char *template; /* Template for automatic generation of names */
41: int name_counter; /* Counter for automatic name generation */
42: int attr_class; /* Attribute class known to this protocol */
43: int multitable; /* Protocol handles all announce hooks itself */
44: uint preference; /* Default protocol preference */
45: uint config_size; /* Size of protocol config */
46:
47: void (*preconfig)(struct protocol *, struct config *); /* Just before configuring */
48: void (*postconfig)(struct proto_config *); /* After configuring each instance */
49: struct proto * (*init)(struct proto_config *); /* Create new instance */
50: int (*reconfigure)(struct proto *, struct proto_config *); /* Try to reconfigure instance, returns success */
51: void (*dump)(struct proto *); /* Debugging dump */
52: void (*dump_attrs)(struct rte *); /* Dump protocol-dependent attributes */
53: int (*start)(struct proto *); /* Start the instance */
54: int (*shutdown)(struct proto *); /* Stop the instance */
55: void (*cleanup)(struct proto *); /* Called after shutdown when protocol became hungry/down */
56: void (*get_status)(struct proto *, byte *buf); /* Get instance status (for `show protocols' command) */
57: void (*get_route_info)(struct rte *, byte *buf, struct ea_list *attrs); /* Get route information (for `show route' command) */
58: int (*get_attr)(struct eattr *, byte *buf, int buflen); /* ASCIIfy dynamic attribute (returns GA_*) */
59: void (*show_proto_info)(struct proto *); /* Show protocol info (for `show protocols all' command) */
60: void (*copy_config)(struct proto_config *, struct proto_config *); /* Copy config from given protocol instance */
61: };
62:
63: void protos_build(void);
64: void proto_build(struct protocol *);
65: void protos_preconfig(struct config *);
66: void protos_postconfig(struct config *);
67: void protos_commit(struct config *new, struct config *old, int force_restart, int type);
68: void protos_dump_all(void);
69:
70: #define GA_UNKNOWN 0 /* Attribute not recognized */
71: #define GA_NAME 1 /* Result = name */
72: #define GA_FULL 2 /* Result = both name and value */
73:
74: /*
75: * Known protocols
76: */
77:
78: extern struct protocol
79: proto_device, proto_radv, proto_rip, proto_static, proto_mrt,
80: proto_ospf, proto_pipe, proto_bgp, proto_bfd, proto_babel;
81:
82: /*
83: * Routing Protocol Instance
84: */
85:
86: struct proto_config {
87: node n;
88: struct config *global; /* Global configuration data */
89: struct protocol *protocol; /* Protocol */
90: struct proto *proto; /* Instance we've created */
91: char *name;
92: char *dsc;
93: int class; /* SYM_PROTO or SYM_TEMPLATE */
94: u32 debug, mrtdump; /* Debugging bitfields, both use D_* constants */
95: unsigned preference, disabled; /* Generic parameters */
96: int vrf_set; /* Related VRF instance (below) is defined */
97: int in_keep_filtered; /* Routes rejected in import filter are kept */
98: u32 router_id; /* Protocol specific router ID */
99: struct iface *vrf; /* Related VRF instance, NULL if global */
100: struct rtable_config *table; /* Table we're attached to */
101: struct filter *in_filter, *out_filter; /* Attached filters */
102: struct proto_limit *rx_limit; /* Limit for receiving routes from protocol
103: (relevant when in_keep_filtered is active) */
104: struct proto_limit *in_limit; /* Limit for importing routes from protocol */
105: struct proto_limit *out_limit; /* Limit for exporting routes to protocol */
106:
107: /* Check proto_reconfigure() and proto_copy_config() after changing struct proto_config */
108:
109: /* Protocol-specific data follow... */
110: };
111:
112: /* Protocol statistics */
113: struct proto_stats {
114: /* Import - from protocol to core */
115: u32 imp_routes; /* Number of routes successfully imported to the (adjacent) routing table */
116: u32 filt_routes; /* Number of routes rejected in import filter but kept in the routing table */
117: u32 pref_routes; /* Number of routes that are preferred, sum over all routing tables */
118: u32 imp_updates_received; /* Number of route updates received */
119: u32 imp_updates_invalid; /* Number of route updates rejected as invalid */
120: u32 imp_updates_filtered; /* Number of route updates rejected by filters */
121: u32 imp_updates_ignored; /* Number of route updates rejected as already in route table */
122: u32 imp_updates_accepted; /* Number of route updates accepted and imported */
123: u32 imp_withdraws_received; /* Number of route withdraws received */
124: u32 imp_withdraws_invalid; /* Number of route withdraws rejected as invalid */
125: u32 imp_withdraws_ignored; /* Number of route withdraws rejected as already not in route table */
126: u32 imp_withdraws_accepted; /* Number of route withdraws accepted and processed */
127:
128: /* Export - from core to protocol */
129: u32 exp_routes; /* Number of routes successfully exported to the protocol */
130: u32 exp_updates_received; /* Number of route updates received */
131: u32 exp_updates_rejected; /* Number of route updates rejected by protocol */
132: u32 exp_updates_filtered; /* Number of route updates rejected by filters */
133: u32 exp_updates_accepted; /* Number of route updates accepted and exported */
134: u32 exp_withdraws_received; /* Number of route withdraws received */
135: u32 exp_withdraws_accepted; /* Number of route withdraws accepted and processed */
136: };
137:
138: struct proto {
139: node n; /* Node in *_proto_list */
140: node glob_node; /* Node in global proto_list */
141: struct protocol *proto; /* Protocol */
142: struct proto_config *cf; /* Configuration data */
143: struct proto_config *cf_new; /* Configuration we want to switch to after shutdown (NULL=delete) */
144: pool *pool; /* Pool containing local objects */
145: struct event *attn; /* "Pay attention" event */
146:
147: char *name; /* Name of this instance (== cf->name) */
148: u32 debug; /* Debugging flags */
149: u32 mrtdump; /* MRTDump flags */
150: unsigned preference; /* Default route preference */
151: byte accept_ra_types; /* Which types of route announcements are accepted (RA_OPTIMAL or RA_ANY) */
152: byte disabled; /* Manually disabled */
153: byte vrf_set; /* Related VRF instance (above) is defined */
154: byte proto_state; /* Protocol state machine (PS_*, see below) */
155: byte core_state; /* Core state machine (FS_*, see below) */
156: byte export_state; /* Route export state (ES_*, see below) */
157: byte reconfiguring; /* We're shutting down due to reconfiguration */
158: byte refeeding; /* We are refeeding (valid only if export_state == ES_FEEDING) */
159: byte flushing; /* Protocol is flushed in current flush loop round */
160: byte gr_recovery; /* Protocol should participate in graceful restart recovery */
161: byte gr_lock; /* Graceful restart mechanism should wait for this proto */
162: byte gr_wait; /* Route export to protocol is postponed until graceful restart */
163: byte down_sched; /* Shutdown is scheduled for later (PDS_*) */
164: byte down_code; /* Reason for shutdown (PDC_* codes) */
165: byte merge_limit; /* Maximal number of nexthops for RA_MERGED */
166: u32 hash_key; /* Random key used for hashing of neighbors */
167: bird_clock_t last_state_change; /* Time of last state transition */
168: char *last_state_name_announced; /* Last state name we've announced to the user */
169: char *message; /* State-change message, allocated from proto_pool */
170: struct proto_stats stats; /* Current protocol statistics */
171:
172: /*
173: * General protocol hooks:
174: *
175: * if_notify Notify protocol about interface state changes.
176: * ifa_notify Notify protocol about interface address changes.
177: * rt_notify Notify protocol about routing table updates.
178: * neigh_notify Notify protocol about neighbor cache events.
179: * make_tmp_attrs Construct ea_list from private attrs stored in rte.
180: * store_tmp_attrs Store private attrs back to the rte.
181: * import_control Called as the first step of the route importing process.
182: * It can construct a new rte, add private attributes and
183: * decide whether the route shall be imported: 1=yes, -1=no,
184: * 0=process it through the import filter set by the user.
185: * reload_routes Request protocol to reload all its routes to the core
186: * (using rte_update()). Returns: 0=reload cannot be done,
187: * 1= reload is scheduled and will happen (asynchronously).
188: * feed_begin Notify protocol about beginning of route feeding.
189: * feed_end Notify protocol about finish of route feeding.
190: */
191:
192: void (*if_notify)(struct proto *, unsigned flags, struct iface *i);
193: void (*ifa_notify)(struct proto *, unsigned flags, struct ifa *a);
194: void (*rt_notify)(struct proto *, struct rtable *table, struct network *net, struct rte *new, struct rte *old, struct ea_list *attrs);
195: void (*neigh_notify)(struct neighbor *neigh);
196: struct ea_list *(*make_tmp_attrs)(struct rte *rt, struct linpool *pool);
197: void (*store_tmp_attrs)(struct rte *rt, struct ea_list *attrs);
198: int (*import_control)(struct proto *, struct rte **rt, struct ea_list **attrs, struct linpool *pool);
199: int (*reload_routes)(struct proto *);
200: void (*feed_begin)(struct proto *, int initial);
201: void (*feed_end)(struct proto *);
202:
203: /*
204: * Routing entry hooks (called only for routes belonging to this protocol):
205: *
206: * rte_recalculate Called at the beginning of the best route selection
207: * rte_better Compare two rte's and decide which one is better (1=first, 0=second).
208: * rte_same Compare two rte's and decide whether they are identical (1=yes, 0=no).
209: * rte_mergable Compare two rte's and decide whether they could be merged (1=yes, 0=no).
210: * rte_insert Called whenever a rte is inserted to a routing table.
211: * rte_remove Called whenever a rte is removed from the routing table.
212: */
213:
214: int (*rte_recalculate)(struct rtable *, struct network *, struct rte *, struct rte *, struct rte *);
215: int (*rte_better)(struct rte *, struct rte *);
216: int (*rte_same)(struct rte *, struct rte *);
217: int (*rte_mergable)(struct rte *, struct rte *);
218: struct rte * (*rte_modify)(struct rte *, struct linpool *);
219: void (*rte_insert)(struct network *, struct rte *);
220: void (*rte_remove)(struct network *, struct rte *);
221:
222: struct iface *vrf; /* Related VRF instance, NULL if global */
223: struct rtable *table; /* Our primary routing table */
224: struct rte_src *main_source; /* Primary route source */
225: struct announce_hook *main_ahook; /* Primary announcement hook */
226: struct announce_hook *ahooks; /* Announcement hooks for this protocol */
227:
228: struct fib_iterator *feed_iterator; /* Routing table iterator used during protocol feeding */
229: struct announce_hook *feed_ahook; /* Announce hook we currently feed */
230:
231: /* Hic sunt protocol-specific data */
232: };
233:
234: struct proto_spec {
235: void *ptr;
236: int patt;
237: };
238:
239:
240: #define PDS_DISABLE 1 /* Proto disable scheduled */
241: #define PDS_RESTART 2 /* Proto restart scheduled */
242:
243: #define PDC_CF_REMOVE 0x01 /* Removed in new config */
244: #define PDC_CF_DISABLE 0x02 /* Disabled in new config */
245: #define PDC_CF_RESTART 0x03 /* Restart due to reconfiguration */
246: #define PDC_CMD_DISABLE 0x11 /* Result of disable command */
247: #define PDC_CMD_RESTART 0x12 /* Result of restart command */
248: #define PDC_CMD_SHUTDOWN 0x13 /* Result of global shutdown */
249: #define PDC_RX_LIMIT_HIT 0x21 /* Route receive limit reached */
250: #define PDC_IN_LIMIT_HIT 0x22 /* Route import limit reached */
251: #define PDC_OUT_LIMIT_HIT 0x23 /* Route export limit reached */
252:
253:
254: void *proto_new(struct proto_config *, unsigned size);
255: void *proto_config_new(struct protocol *, int class);
256: void proto_copy_config(struct proto_config *dest, struct proto_config *src);
257: void proto_set_message(struct proto *p, char *msg, int len);
258: void proto_request_feeding(struct proto *p);
259:
260: static inline void
261: proto_copy_rest(struct proto_config *dest, struct proto_config *src, unsigned size)
262: { memcpy(dest + 1, src + 1, size - sizeof(struct proto_config)); }
263:
264: void graceful_restart_recovery(void);
265: void graceful_restart_init(void);
266: void graceful_restart_show_status(void);
267: void proto_graceful_restart_lock(struct proto *p);
268: void proto_graceful_restart_unlock(struct proto *p);
269:
270: #define DEFAULT_GR_WAIT 240
271:
272: void proto_show_limit(struct proto_limit *l, const char *dsc);
273: void proto_show_basic_info(struct proto *p);
274:
275: void proto_cmd_show(struct proto *, uintptr_t, int);
276: void proto_cmd_disable(struct proto *, uintptr_t, int);
277: void proto_cmd_enable(struct proto *, uintptr_t, int);
278: void proto_cmd_restart(struct proto *, uintptr_t, int);
279: void proto_cmd_reload(struct proto *, uintptr_t, int);
280: void proto_cmd_debug(struct proto *, uintptr_t, int);
281: void proto_cmd_mrtdump(struct proto *, uintptr_t, int);
282:
283: void proto_apply_cmd(struct proto_spec ps, void (* cmd)(struct proto *, uintptr_t, int), int restricted, uintptr_t arg);
284: struct proto *proto_get_named(struct symbol *, struct protocol *);
285:
286: #define CMD_RELOAD 0
287: #define CMD_RELOAD_IN 1
288: #define CMD_RELOAD_OUT 2
289:
290: static inline u32
291: proto_get_router_id(struct proto_config *pc)
292: {
293: return pc->router_id ? pc->router_id : pc->global->router_id;
294: }
295:
296: static inline struct ea_list *
297: rte_make_tmp_attrs(struct rte *rt, struct linpool *pool)
298: {
299: struct ea_list *(*mta)(struct rte *rt, struct linpool *pool);
300: mta = rt->attrs->src->proto->make_tmp_attrs;
301: return mta ? mta(rt, pool) : NULL;
302: }
303:
304: /* Moved from route.h to avoid dependency conflicts */
305: static inline void rte_update(struct proto *p, net *net, rte *new) { rte_update2(p->main_ahook, net, new, p->main_source); }
306:
307: extern list active_proto_list;
308:
309: /*
310: * Each protocol instance runs two different state machines:
311: *
312: * [P] The protocol machine: (implemented inside protocol)
313: *
314: * DOWN ----> START
315: * ^ |
316: * | V
317: * STOP <---- UP
318: *
319: * States: DOWN Protocol is down and it's waiting for the core
320: * requesting protocol start.
321: * START Protocol is waiting for connection with the rest
322: * of the network and it's not willing to accept
323: * packets. When it connects, it goes to UP state.
324: * UP Protocol is up and running. When the network
325: * connection breaks down or the core requests
326: * protocol to be terminated, it goes to STOP state.
327: * STOP Protocol is disconnecting from the network.
328: * After it disconnects, it returns to DOWN state.
329: *
330: * In: start() Called in DOWN state to request protocol startup.
331: * Returns new state: either UP or START (in this
332: * case, the protocol will notify the core when it
333: * finally comes UP).
334: * stop() Called in START, UP or STOP state to request
335: * protocol shutdown. Returns new state: either
336: * DOWN or STOP (in this case, the protocol will
337: * notify the core when it finally comes DOWN).
338: *
339: * Out: proto_notify_state() -- called by protocol instance when
340: * it does any state transition not covered by
341: * return values of start() and stop(). This includes
342: * START->UP (delayed protocol startup), UP->STOP
343: * (spontaneous shutdown) and STOP->DOWN (delayed
344: * shutdown).
345: */
346:
347: #define PS_DOWN 0
348: #define PS_START 1
349: #define PS_UP 2
350: #define PS_STOP 3
351:
352: void proto_notify_state(struct proto *p, unsigned state);
353:
354: /*
355: * [F] The feeder machine: (implemented in core routines)
356: *
357: * HUNGRY ----> FEEDING
358: * ^ |
359: * | V
360: * FLUSHING <---- HAPPY
361: *
362: * States: HUNGRY Protocol either administratively down (i.e.,
363: * disabled by the user) or temporarily down
364: * (i.e., [P] is not UP)
365: * FEEDING The protocol came up and we're feeding it
366: * initial routes. [P] is UP.
367: * HAPPY The protocol is up and it's receiving normal
368: * routing updates. [P] is UP.
369: * FLUSHING The protocol is down and we're removing its
370: * routes from the table. [P] is STOP or DOWN.
371: *
372: * Normal lifecycle of a protocol looks like:
373: *
374: * HUNGRY/DOWN --> HUNGRY/START --> HUNGRY/UP -->
375: * FEEDING/UP --> HAPPY/UP --> FLUSHING/STOP|DOWN -->
376: * HUNGRY/STOP|DOWN --> HUNGRY/DOWN
377: *
378: * Sometimes, protocol might switch from HAPPY/UP to FEEDING/UP
379: * if it wants to refeed the routes (for example BGP does so
380: * as a result of received ROUTE-REFRESH request).
381: */
382:
383: #define FS_HUNGRY 0
384: #define FS_FEEDING 1 /* obsolete */
385: #define FS_HAPPY 2
386: #define FS_FLUSHING 3
387:
388:
389: #define ES_DOWN 0
390: #define ES_FEEDING 1
391: #define ES_READY 2
392:
393:
394:
395: /*
396: * Debugging flags
397: */
398:
399: #define D_STATES 1 /* [core] State transitions */
400: #define D_ROUTES 2 /* [core] Routes passed by the filters */
401: #define D_FILTERS 4 /* [core] Routes rejected by the filters */
402: #define D_IFACES 8 /* [core] Interface events */
403: #define D_EVENTS 16 /* Protocol events */
404: #define D_PACKETS 32 /* Packets sent/received */
405:
406: #ifndef PARSER
407: #define TRACE(flags, msg, args...) \
408: do { if (p->p.debug & flags) log(L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
409: #endif
410:
411:
412: /*
413: * MRTDump flags
414: */
415:
416: #define MD_STATES 1 /* Protocol state changes (BGP4MP_MESSAGE_AS4) */
417: #define MD_MESSAGES 2 /* Protocol packets (BGP4MP_MESSAGE_AS4) */
418:
419: /*
420: * Known unique protocol instances as referenced by config routines
421: */
422:
423: extern struct proto_config *cf_dev_proto;
424:
425:
426: /*
427: * Protocol limits
428: */
429:
430: #define PLD_RX 0 /* Receive limit */
431: #define PLD_IN 1 /* Import limit */
432: #define PLD_OUT 2 /* Export limit */
433: #define PLD_MAX 3
434:
435: #define PLA_WARN 1 /* Issue log warning */
436: #define PLA_BLOCK 2 /* Block new routes */
437: #define PLA_RESTART 4 /* Force protocol restart */
438: #define PLA_DISABLE 5 /* Shutdown and disable protocol */
439:
440: #define PLS_INITIAL 0 /* Initial limit state after protocol start */
441: #define PLS_ACTIVE 1 /* Limit was hit */
442: #define PLS_BLOCKED 2 /* Limit is active and blocking new routes */
443:
444: struct proto_limit {
445: u32 limit; /* Maximum number of prefixes */
446: byte action; /* Action to take (PLA_*) */
447: byte state; /* State of limit (PLS_*) */
448: };
449:
450: void proto_notify_limit(struct announce_hook *ah, struct proto_limit *l, int dir, u32 rt_count);
451: void proto_verify_limits(struct announce_hook *ah);
452:
453: static inline void
454: proto_reset_limit(struct proto_limit *l)
455: {
456: if (l)
457: l->state = PLS_INITIAL;
458: }
459:
460:
461: /*
462: * Route Announcement Hook
463: */
464:
465: struct announce_hook {
466: node n;
467: struct rtable *table;
468: struct proto *proto;
469: struct filter *in_filter; /* Input filter */
470: struct filter *out_filter; /* Output filter */
471: struct proto_limit *rx_limit; /* Receive limit (for in_keep_filtered) */
472: struct proto_limit *in_limit; /* Input limit */
473: struct proto_limit *out_limit; /* Output limit */
474: struct proto_stats *stats; /* Per-table protocol statistics */
475: struct announce_hook *next; /* Next hook for the same protocol */
476: int in_keep_filtered; /* Routes rejected in import filter are kept */
477: bird_clock_t last_out_filter_change; /* Last time when out_filter _changed_ */
478: };
479:
480: struct announce_hook *proto_add_announce_hook(struct proto *p, struct rtable *t, struct proto_stats *stats);
481: struct announce_hook *proto_find_announce_hook(struct proto *p, struct rtable *t);
482:
483: #endif
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