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