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1 /*
2 * BIRD -- OSPF
3 *
4 * (c) 1999--2005 Ondrej Filip <feela@network.cz>
5 * (c) 2009--2014 Ondrej Zajicek <santiago@crfreenet.org>
6 * (c) 2009--2014 CZ.NIC z.s.p.o.
7 *
8 * Can be freely distributed and used under the terms of the GNU GPL.
9 */
10
11 #ifndef _BIRD_OSPF_H_
12 #define _BIRD_OSPF_H_
13
14 #include "nest/bird.h"
15
16 #include "lib/checksum.h"
17 #include "lib/idm.h"
18 #include "lib/lists.h"
19 #include "lib/slists.h"
20 #include "lib/socket.h"
21 #include "lib/timer.h"
22 #include "lib/resource.h"
23 #include "nest/protocol.h"
24 #include "nest/iface.h"
25 #include "nest/route.h"
26 #include "nest/cli.h"
27 #include "nest/locks.h"
28 #include "nest/bfd.h"
29 #include "conf/conf.h"
30 #include "lib/string.h"
31
32
33 #ifdef LOCAL_DEBUG
34 #define OSPF_FORCE_DEBUG 1
35 #else
36 #define OSPF_FORCE_DEBUG 0
37 #endif
38
39
40 #define OSPF_TRACE(flags, msg, args...) \
41 do { if ((p->p.debug & flags) || OSPF_FORCE_DEBUG) \
42 log(L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
43
44 #define OSPF_PACKET(dumpfn, buffer, msg, args...) \
45 do { if ((p->p.debug & D_PACKETS) || OSPF_FORCE_DEBUG) \
46 { log(L_TRACE "%s: " msg, p->p.name, ## args ); dumpfn(p, buffer); } } while(0)
47
48 #define LOG_PKT(msg, args...) \
49 log_rl(&p->log_pkt_tbf, L_REMOTE "%s: " msg, p->p.name, args)
50
51 #define LOG_PKT_AUTH(msg, args...) \
52 log_rl(&p->log_pkt_tbf, L_AUTH "%s: " msg, p->p.name, args)
53
54 #define LOG_PKT_WARN(msg, args...) \
55 log_rl(&p->log_pkt_tbf, L_WARN "%s: " msg, p->p.name, args)
56
57 #define LOG_LSA1(msg, args...) \
58 log_rl(&p->log_lsa_tbf, L_REMOTE "%s: " msg, p->p.name, args)
59
60 #define LOG_LSA2(msg, args...) \
61 do { if (! p->log_lsa_tbf.drop) \
62 log(L_REMOTE "%s: " msg, p->p.name, args); } while(0)
63
64
65 #define OSPF_PROTO 89
66
67 #define LSREFRESHTIME 1800 /* 30 minutes */
68 #define MINLSINTERVAL (5 S_)
69 #define MINLSARRIVAL (1 S_)
70 #define LSINFINITY 0xffffff
71
72 #define OSPF_PKT_TYPES 5 /* HELLO_P .. LSACK_P */
73 #define OSPF3_CRYPTO_ID 1 /* OSPFv3 Cryptographic Protocol ID */
74
75 #define OSPF_DEFAULT_TICK 1
76 #define OSPF_DEFAULT_STUB_COST 1000
77 #define OSPF_DEFAULT_ECMP_LIMIT 16
78 #define OSPF_DEFAULT_GR_TIME 120
79 #define OSPF_DEFAULT_TRANSINT 40
80
81 #define OSPF_MIN_PKT_SIZE 256
82 #define OSPF_MAX_PKT_SIZE 65535
83
84 #define OSPF_VLINK_ID_OFFSET 0x80000000
85
86 #define OSPF_GR_ABLE 1
87 #define OSPF_GR_AWARE 2
88
89 struct ospf_config
90 {
91 struct proto_config c;
92 uint tick;
93 u8 ospf2;
94 u8 af_ext;
95 u8 af_mc;
96 u8 rfc1583;
97 u8 stub_router;
98 u8 merge_external;
99 u8 instance_id;
100 u8 instance_id_set;
101 u8 abr;
102 u8 asbr;
103 u8 vpn_pe;
104 u8 gr_mode; /* Graceful restart mode (OSPF_GR_*) */
105 uint gr_time; /* Graceful restart interval */
106 uint ecmp;
107 list area_list; /* list of area configs (struct ospf_area_config) */
108 list vlink_list; /* list of configured vlinks (struct ospf_iface_patt) */
109 };
110
111 struct ospf_area_config
112 {
113 node n;
114 u32 areaid;
115 u32 default_cost; /* Cost of default route for stub areas
116 (With possible LSA_EXT3_EBIT for NSSA areas) */
117 u8 type; /* Area type (standard, stub, NSSA), represented
118 by option flags (OPT_E, OPT_N) */
119 u8 summary; /* Import summaries to this stub/NSSA area, valid for ABR */
120 u8 default_nssa; /* Generate default NSSA route for NSSA+summary area */
121 u8 translator; /* Translator role, for NSSA ABR */
122 u32 transint; /* Translator stability interval */
123 list patt_list; /* List of iface configs (struct ospf_iface_patt) */
124 list net_list; /* List of aggregate networks for that area */
125 list enet_list; /* List of aggregate external (NSSA) networks */
126 list stubnet_list; /* List of stub networks added to Router LSA */
127 };
128
129 struct area_net_config
130 {
131 node n;
132 net_addr prefix;
133 u32 tag;
134 u8 hidden;
135 };
136
137 struct area_net
138 {
139 u32 metric; /* With possible LSA_EXT3_EBIT for NSSA area nets */
140 u32 tag;
141 u8 hidden;
142 u8 active;
143 struct fib_node fn;
144 };
145
146 struct ospf_stubnet_config
147 {
148 node n;
149 net_addr prefix;
150 u32 cost;
151 u8 hidden;
152 u8 summary;
153 };
154
155 struct nbma_node
156 {
157 node n;
158 ip_addr ip;
159 byte eligible;
160 byte found;
161 };
162
163 struct ospf_iface_patt
164 {
165 struct iface_patt i;
166 u32 type;
167 u32 stub;
168 u32 cost;
169 u32 helloint;
170 u32 rxmtint;
171 u32 pollint;
172 u32 waitint;
173 u32 deadc;
174 u32 deadint;
175 u32 inftransdelay;
176 list nbma_list;
177 u32 priority;
178 u32 voa;
179 u32 vid;
180 int tx_tos;
181 int tx_priority;
182 u16 tx_length;
183 u16 rx_buffer;
184 #define OSPF_RXBUF_MINSIZE 256 /* Minimal allowed size */
185 u8 instance_id;
186 u8 instance_id_set;
187 u8 autype; /* OSPF_AUTH_*, not really used in OSPFv3 */
188 u8 strictnbma;
189 u8 check_link;
190 u8 ecmp_weight;
191 u8 link_lsa_suppression;
192 u8 real_bcast; /* Not really used in OSPFv3 */
193 u8 ptp_netmask; /* bool + 2 for unspecified */
194 u8 ptp_address; /* bool + 2 for unspecified */
195 u8 ttl_security; /* bool + 2 for TX only */
196 u8 bfd;
197 list *passwords;
198 };
199
200 /* Default values for interface parameters */
201 #define COST_D 10
202 #define RXMTINT_D 5
203 #define INFTRANSDELAY_D 1
204 #define PRIORITY_D 1
205 #define HELLOINT_D 10
206 #define POLLINT_D 20
207 #define DEADC_D 4
208 #define WAIT_DMH 4
209 /* Value of Wait timer - not found it in RFC * - using 4*HELLO */
210
211
212
213 struct ospf_proto
214 {
215 struct proto p;
216 timer *disp_timer; /* OSPF proto dispatcher */
217 uint tick;
218 struct top_graph *gr; /* LSA graph */
219 slist lsal; /* List of all LSA's */
220 int calcrt; /* Routing table calculation scheduled?
221 0=no, 1=normal, 2=forced reload */
222 list iface_list; /* List of OSPF interfaces (struct ospf_iface) */
223 list area_list; /* List of OSPF areas (struct ospf_area) */
224 int areano; /* Number of area I belong to */
225 int padj; /* Number of neighbors in Exchange or Loading state */
226 int gr_count; /* Number of neighbors in graceful restart state */
227 u8 gr_recovery; /* Graceful restart recovery is active */
228 u8 gr_cleanup; /* GR cleanup scheduled */
229 btime gr_timeout; /* The end time of grace restart recovery */
230 struct fib rtf; /* Routing table */
231 struct idm idm; /* OSPFv3 LSA ID map */
232 u8 ospf2; /* OSPF v2 or v3 */
233 u8 af_ext; /* OSPFv3-AF extension */
234 u8 af_mc; /* OSPFv3-AF multicast */
235 u8 rfc1583; /* RFC1583 compatibility */
236 u8 stub_router; /* Do not forward transit traffic */
237 u8 merge_external; /* Should i merge external routes? */
238 u8 instance_id; /* Differentiate between more OSPF instances */
239 u8 asbr; /* May i originate any ext/NSSA lsa? */
240 u8 vpn_pe; /* Should we do VPN PE specific behavior (RFC 4577)? */
241 u8 ecmp; /* Maximal number of nexthops in ECMP route, or 0 */
242 u8 gr_mode; /* Graceful restart mode (OSPF_GR_*) */
243 uint gr_time; /* Graceful restart interval */
244 u64 csn64; /* Last used cryptographic sequence number */
245 struct ospf_area *backbone; /* If exists */
246 event *flood_event; /* Event for flooding LS updates */
247 void *lsab; /* LSA buffer used when originating router LSAs */
248 int lsab_size, lsab_used;
249 linpool *nhpool; /* Linpool used for next hops computed in SPF */
250 sock *vlink_sk; /* IP socket used for vlink TX */
251 u32 router_id;
252 u32 last_vlink_id; /* Interface IDs for vlinks (starts at 0x80000000) */
253 struct tbf log_pkt_tbf; /* TBF for packet messages */
254 struct tbf log_lsa_tbf; /* TBF for LSA messages */
255 ip_addr loopback_addr; /* IP address used as common next hop (in OSPFv3-IPv4) */
256 };
257
258 struct ospf_area
259 {
260 node n;
261 u32 areaid;
262 struct ospf_area_config *ac; /* Related area config */
263 struct top_hash_entry *rt; /* My own router LSA */
264 struct top_hash_entry *pxr_lsa; /* Originated prefix LSA */
265 list cand; /* List of candidates for RT calc. */
266 struct fib net_fib; /* Networks to advertise or not */
267 struct fib enet_fib; /* External networks for NSSAs */
268 u32 options; /* Optional features */
269 u8 update_rt_lsa; /* Rt lsa origination scheduled? */
270 u8 trcap; /* Transit capability? */
271 u8 marked; /* Used in OSPF reconfigure */
272 u8 translate; /* Translator state (TRANS_*), for NSSA ABR */
273 timer *translator_timer; /* For NSSA translator switch */
274 struct ospf_proto *po;
275 struct fib rtr; /* Routing tables for routers */
276 };
277
278 struct ospf_iface
279 {
280 node n;
281 struct iface *iface; /* Nest's iface (NULL for vlinks) */
282 struct ifa *addr; /* IP prefix associated with that OSPF iface */
283 struct ospf_area *oa;
284 struct ospf_iface_patt *cf;
285 char *ifname; /* Interface name (iface->name), new one for vlinks */
286
287 pool *pool;
288 sock *sk; /* IP socket */
289 list neigh_list; /* List of neighbors (struct ospf_neighbor) */
290 u32 cost; /* Cost of iface */
291 u32 waitint; /* Number of seconds before changing state from wait */
292 u32 rxmtint; /* Number of seconds between LSA retransmissions */
293 u32 pollint; /* Poll interval in seconds */
294 u32 deadint; /* After deadint seconds without hellos is router dead */
295 u32 iface_id; /* Interface ID (iface->index or new value for vlinks) */
296 u32 vid; /* ID of peer of virtual link */
297 ip_addr vip; /* IP of peer of virtual link */
298 struct ospf_iface *vifa; /* OSPF iface which the vlink goes through */
299 struct ospf_area *voa; /* OSPF area which the vlink goes through */
300 u16 inftransdelay; /* The estimated number of seconds it takes to
301 transmit a Link State Update Packet over this
302 interface. LSAs contained in the update */
303 u16 helloint; /* number of seconds between hello sending */
304 list *passwords;
305 u32 csn; /* Last used crypt seq number */
306 btime csn_use; /* Last time when packet with that CSN was sent */
307 ip_addr all_routers; /* Multicast (or broadcast) address for all routers */
308 ip_addr des_routers; /* Multicast (or NULL) address for designated routers */
309 ip_addr drip; /* Designated router IP */
310 ip_addr bdrip; /* Backup DR IP */
311 u32 drid; /* DR Router ID */
312 u32 bdrid; /* BDR Router ID */
313 s16 rt_pos_beg; /* Position of iface in Router-LSA, begin, inclusive */
314 s16 rt_pos_end; /* Position of iface in Router-LSA, end, exclusive */
315 s16 px_pos_beg; /* Position of iface in Rt Prefix-LSA, begin, inclusive */
316 s16 px_pos_end; /* Position of iface in Rt Prefix-LSA, end, exclusive */
317 u32 dr_iface_id; /* if drid is valid, this is iface_id of DR (for connecting network) */
318 u8 instance_id; /* Used to differentiate between more OSPF
319 instances on one interface */
320 u8 autype; /* Authentication type (OSPF_AUTH_*) */
321 u8 type; /* OSPF view of type (OSPF_IT_*) */
322 u8 strictnbma; /* Can I talk with unknown neighbors? */
323 u8 stub; /* Inactive interface */
324 u8 state; /* Interface state machine (OSPF_IS_*) */
325 timer *wait_timer; /* WAIT timer */
326 timer *hello_timer; /* HELLOINT timer */
327 timer *poll_timer; /* Poll Interval - for NBMA */
328
329 struct top_hash_entry *link_lsa; /* Originated link LSA */
330 struct top_hash_entry *net_lsa; /* Originated network LSA */
331 struct top_hash_entry *pxn_lsa; /* Originated prefix LSA */
332 struct top_hash_entry **flood_queue; /* LSAs queued for LSUPD */
333 u8 update_link_lsa;
334 u8 update_net_lsa;
335 u8 loopback_addr_used; /* The Link-LSA depends on p->loopback_addr */
336 u16 flood_queue_used; /* The current number of LSAs in flood_queue */
337 u16 flood_queue_size; /* The maximum number of LSAs in flood_queue */
338 int fadj; /* Number of fully adjacent neighbors */
339 list nbma_list;
340 u8 priority; /* A router priority for DR election */
341 u8 ioprob;
342 #define OSPF_I_OK 0 /* Everything OK */
343 #define OSPF_I_SK 1 /* Socket open failed */
344 #define OSPF_I_LL 2 /* Missing link-local address (OSPFv3) */
345 u8 sk_dr; /* Socket is a member of designated routers group */
346 u8 marked; /* Used in OSPF reconfigure, 2 for force restart */
347 u16 rxbuf; /* Buffer size */
348 u16 tx_length; /* Soft TX packet length limit, usually MTU */
349 u16 tx_hdrlen; /* Expected packet header length, less than tx_length */
350 u8 check_link; /* Whether iface link change is used */
351 u8 ecmp_weight; /* Weight used for ECMP */
352 u8 link_lsa_suppression; /* Suppression of Link-LSA origination */
353 u8 ptp_netmask; /* Send real netmask for P2P */
354 u8 ptp_address; /* Send IP address in data field for PtP */
355 u8 check_ttl; /* Check incoming packets for TTL 255 */
356 u8 bfd; /* Use BFD on iface */
357 };
358
359 struct ospf_neighbor
360 {
361 node n;
362 pool *pool;
363 struct ospf_iface *ifa;
364 u8 state;
365 u8 gr_active; /* We act as GR helper for the neighbor */
366 u8 got_my_rt_lsa; /* Received my Rt-LSA in DBDES exchanged */
367 timer *inactim; /* Inactivity timer */
368 u8 imms; /* I, M, Master/slave received */
369 u8 myimms; /* I, M Master/slave */
370 u32 dds; /* DD Sequence number being sent */
371 u32 ddr; /* last Dat Des packet received */
372
373 u32 rid; /* Router ID */
374 ip_addr ip; /* IP of it's interface */
375 u8 priority; /* Priority */
376 u32 options; /* Options received */
377
378 /* Entries dr and bdr store IP addresses in OSPFv2 and router IDs in
379 OSPFv3, we use the same type to simplify handling */
380 u32 dr; /* Neighbor's idea of DR */
381 u32 bdr; /* Neighbor's idea of BDR */
382 u32 iface_id; /* ID of Neighbour's iface connected to common network */
383
384 /* Database summary list iterator, controls initial dbdes exchange.
385 * Advances in the LSA list as dbdes packets are sent.
386 */
387 siterator dbsi; /* iterator of po->lsal */
388
389 /* Link state request list, controls initial LSA exchange.
390 * Entries added when received in dbdes packets, removed as sent in lsreq packets.
391 */
392 slist lsrql; /* slist of struct top_hash_entry from n->lsrqh */
393 struct top_graph *lsrqh;
394 struct top_hash_entry *lsrqi; /* Pointer to the first unsent node in lsrql */
395
396 /* Link state retransmission list, controls LSA retransmission during flood.
397 * Entries added as sent in lsupd packets, removed when received in lsack packets.
398 * These entries hold ret_count in appropriate LSA entries.
399 */
400 slist lsrtl; /* slist of struct top_hash_entry from n->lsrth */
401 struct top_graph *lsrth;
402 timer *dbdes_timer; /* DBDES exchange timer */
403 timer *lsrq_timer; /* LSA request timer */
404 timer *lsrt_timer; /* LSA retransmission timer */
405 list ackl[2];
406 #define ACKL_DIRECT 0
407 #define ACKL_DELAY 1
408 timer *ackd_timer; /* Delayed ack timer */
409 timer *gr_timer; /* Graceful restart timer, non-NULL only if gr_active */
410 struct bfd_request *bfd_req; /* BFD request, if BFD is used */
411 void *ldd_buffer; /* Last database description packet */
412 u32 ldd_bsize; /* Buffer size for ldd_buffer */
413 u32 csn; /* OSPFv2: Last received crypt seq number */
414 u64 csn64[OSPF_PKT_TYPES]; /* OSPFv3: Last received CSN for each type of packet */
415 };
416
417
418 /* OSPF interface types */
419 #define OSPF_IT_BCAST 0
420 #define OSPF_IT_NBMA 1
421 #define OSPF_IT_PTP 2
422 #define OSPF_IT_PTMP 3
423 #define OSPF_IT_VLINK 4
424 #define OSPF_IT_UNDEF 5
425
426 /* OSPF interface states */
427 #define OSPF_IS_DOWN 0 /* Not active */
428 #define OSPF_IS_LOOP 1 /* Iface with no link */
429 #define OSPF_IS_WAITING 2 /* Waiting for Wait timer */
430 #define OSPF_IS_PTP 3 /* PTP operational */
431 #define OSPF_IS_DROTHER 4 /* I'm on BCAST or NBMA and I'm not DR */
432 #define OSPF_IS_BACKUP 5 /* I'm BDR */
433 #define OSPF_IS_DR 6 /* I'm DR */
434
435 /* Definitions for interface state machine */
436 #define ISM_UP 0 /* Interface Up */
437 #define ISM_WAITF 1 /* Wait timer fired */
438 #define ISM_BACKS 2 /* Backup seen */
439 #define ISM_NEICH 3 /* Neighbor change */
440 #define ISM_LOOP 4 /* Link down */
441 #define ISM_UNLOOP 5 /* Link up */
442 #define ISM_DOWN 6 /* Interface down */
443
444 /* OSPF authentication types */
445 #define OSPF_AUTH_NONE 0
446 #define OSPF_AUTH_SIMPLE 1
447 #define OSPF_AUTH_CRYPT 2
448
449 #define OSPF3_AUTH_HMAC 1 /* HMAC Cryptographic Authentication */
450
451 /* OSPF neighbor states */
452 #define NEIGHBOR_DOWN 0
453 #define NEIGHBOR_ATTEMPT 1
454 #define NEIGHBOR_INIT 2
455 #define NEIGHBOR_2WAY 3
456 #define NEIGHBOR_EXSTART 4
457 #define NEIGHBOR_EXCHANGE 5
458 #define NEIGHBOR_LOADING 6
459 #define NEIGHBOR_FULL 7
460
461 /* Definitions for neighbor state machine */
462 #define INM_HELLOREC 0 /* Hello Received */
463 #define INM_START 1 /* Neighbor start - for NBMA */
464 #define INM_2WAYREC 2 /* 2-Way received */
465 #define INM_NEGDONE 3 /* Negotiation done */
466 #define INM_EXDONE 4 /* Exchange done */
467 #define INM_BADLSREQ 5 /* Bad LS Request */
468 #define INM_LOADDONE 6 /* Load done */
469 #define INM_ADJOK 7 /* AdjOK? */
470 #define INM_SEQMIS 8 /* Sequence number mismatch */
471 #define INM_1WAYREC 9 /* 1-Way */
472 #define INM_KILLNBR 10 /* Kill Neighbor */
473 #define INM_INACTTIM 11 /* Inactivity timer */
474 #define INM_LLDOWN 12 /* Line down */
475
476 #define TRANS_OFF 0
477 #define TRANS_ON 1
478 #define TRANS_WAIT 2 /* Waiting before the end of translation */
479
480
481 /* Generic option flags */
482 #define OPT_V6 0x0001 /* OSPFv3, LSA relevant for IPv6 routing calculation */
483 #define OPT_E 0x0002 /* Related to AS-external LSAs */
484 #define OPT_MC 0x0004 /* Related to MOSPF, not used and obsolete */
485 #define OPT_N 0x0008 /* Related to NSSA */
486 #define OPT_P 0x0008 /* OSPFv2, flags P and N share position, see NSSA RFC */
487 #define OPT_L_V2 0x0010 /* OSPFv2, link-local signaling, not used */
488 #define OPT_R 0x0010 /* OSPFv3, originator is active router */
489 #define OPT_DC 0x0020 /* Related to demand circuits, not used */
490 #define OPT_O 0x0040 /* OSPFv2 Opaque LSA (RFC 5250) */
491 #define OPT_DN 0x0080 /* OSPFv2 VPN loop prevention (RFC 4576) */
492 #define OPT_AF 0x0100 /* OSPFv3 Address Families (RFC 5838) */
493 #define OPT_L_V3 0x0200 /* OSPFv3, link-local signaling */
494 #define OPT_AT 0x0400 /* OSPFv3, authentication trailer */
495
496 #define HELLO2_OPT_MASK (OPT_E | OPT_N | OPT_L_V2)
497 #define DBDES2_OPT_MASK (OPT_E | OPT_L_V2 | OPT_O)
498
499 #define HELLO3_OPT_MASK (OPT_V6 | OPT_E | OPT_N | OPT_R | OPT_AF | OPT_L_V3 | OPT_AT )
500 #define DBDES3_OPT_MASK (OPT_V6 | OPT_E | OPT_R | OPT_AF | OPT_L_V3 | OPT_AT )
501
502 /* Router-LSA VEB flags are are stored together with links (OSPFv2) or options (OSPFv3) */
503 #define OPT_RT_B (0x01 << 24)
504 #define OPT_RT_E (0x02 << 24)
505 #define OPT_RT_V (0x04 << 24)
506 #define OPT_RT_NT (0x10 << 24)
507
508 /* Prefix flags, specific for OSPFv3 */
509 #define OPT_PX_NU 0x01
510 #define OPT_PX_LA 0x02
511 #define OPT_PX_P 0x08
512 #define OPT_PX_DN 0x10
513
514
515 struct ospf_packet
516 {
517 u8 version;
518 u8 type;
519 u16 length;
520 u32 routerid;
521 u32 areaid;
522 u16 checksum;
523 u8 instance_id; /* See RFC 6549 */
524 u8 autype; /* Undefined for OSPFv3 */
525 };
526
527 struct ospf_lls
528 {
529 u16 checksum;
530 u16 length;
531 byte data[0];
532 };
533
534 struct ospf_auth_crypto
535 {
536 u16 zero;
537 u8 keyid;
538 u8 len;
539 u32 csn; /* Cryptographic sequence number (32-bit) */
540 };
541
542 union ospf_auth2
543 {
544 u8 password[8];
545 struct ospf_auth_crypto c32;
546 };
547
548 struct ospf_auth3
549 {
550 u16 type; /* Authentication type (OSPF3_AUTH_*) */
551 u16 length; /* Authentication trailer length (header + data) */
552 u16 reserved;
553 u16 sa_id; /* Security association identifier (key_id) */
554 u64 csn; /* Cryptographic sequence number (64-bit) */
555 byte data[0]; /* Authentication data */
556 };
557
558
559 /* Packet types */
560 #define HELLO_P 1 /* Hello */
561 #define DBDES_P 2 /* Database description */
562 #define LSREQ_P 3 /* Link state request */
563 #define LSUPD_P 4 /* Link state update */
564 #define LSACK_P 5 /* Link state acknowledgement */
565
566
567 #define DBDES_I 4 /* Init bit */
568 #define DBDES_M 2 /* More bit */
569 #define DBDES_MS 1 /* Master/Slave bit */
570 #define DBDES_IMMS (DBDES_I | DBDES_M | DBDES_MS)
571
572
573 /* OSPFv3 LSA Types / LSA Function Codes */
574 /* https://www.iana.org/assignments/ospfv3-parameters/ospfv3-parameters.xhtml#ospfv3-parameters-3 */
575 #define LSA_T_RT 0x2001
576 #define LSA_T_NET 0x2002
577 #define LSA_T_SUM_NET 0x2003
578 #define LSA_T_SUM_RT 0x2004
579 #define LSA_T_EXT 0x4005
580 #define LSA_T_NSSA 0x2007
581 #define LSA_T_LINK 0x0008
582 #define LSA_T_PREFIX 0x2009
583 #define LSA_T_GR 0x000B
584 #define LSA_T_RI_ 0x000C
585 #define LSA_T_RI_LINK 0x800C
586 #define LSA_T_RI_AREA 0xA00C
587 #define LSA_T_RI_AS 0xC00C
588 #define LSA_T_OPAQUE_ 0x1FFF
589 #define LSA_T_OPAQUE_LINK 0x9FFF
590 #define LSA_T_OPAQUE_AREA 0xBFFF
591 #define LSA_T_OPAQUE_AS 0xDFFF
592
593 #define LSA_T_V2_OPAQUE_ 0x0009
594 #define LSA_T_V2_MASK 0x00ff
595
596 /* OSPFv2 Opaque LSA Types */
597 /* https://www.iana.org/assignments/ospf-opaque-types/ospf-opaque-types.xhtml#ospf-opaque-types-2 */
598 #define LSA_OT_GR 0x03
599 #define LSA_OT_RI 0x04
600
601 #define LSA_FUNCTION_MASK 0x1FFF
602 #define LSA_FUNCTION(type) ((type) & LSA_FUNCTION_MASK)
603
604 #define LSA_UBIT 0x8000
605
606 #define LSA_SCOPE_LINK 0x0000
607 #define LSA_SCOPE_AREA 0x2000
608 #define LSA_SCOPE_AS 0x4000
609 #define LSA_SCOPE_RES 0x6000
610 #define LSA_SCOPE_MASK 0x6000
611 #define LSA_SCOPE(type) ((type) & LSA_SCOPE_MASK)
612 #define LSA_SCOPE_ORDER(type) (((type) >> 13) & 0x3)
613
614
615 #define LSA_MAXAGE 3600 /* 1 hour */
616 #define LSA_CHECKAGE 300 /* 5 minutes */
617 #define LSA_MAXAGEDIFF 900 /* 15 minutes */
618
619 #define LSA_ZEROSEQNO ((s32) 0x80000000)
620 #define LSA_INITSEQNO ((s32) 0x80000001)
621 #define LSA_MAXSEQNO ((s32) 0x7fffffff)
622
623 #define LSA_METRIC_MASK 0x00FFFFFF
624 #define LSA_OPTIONS_MASK 0x00FFFFFF
625
626
627 #define LSART_PTP 1
628 #define LSART_NET 2
629 #define LSART_STUB 3
630 #define LSART_VLNK 4
631
632 #define LSA_RT2_LINKS 0x0000FFFF
633
634 #define LSA_SUM2_TOS 0xFF000000
635
636 #define LSA_EXT2_TOS 0x7F000000
637 #define LSA_EXT2_EBIT 0x80000000
638
639 #define LSA_EXT3_EBIT 0x04000000
640 #define LSA_EXT3_FBIT 0x02000000
641 #define LSA_EXT3_TBIT 0x01000000
642
643 /* OSPF Grace LSA (GR) TLVs */
644 /* https://www.iana.org/assignments/ospfv2-parameters/ospfv2-parameters.xhtml#ospfv2-parameters-13 */
645 #define LSA_GR_PERIOD 1
646 #define LSA_GR_REASON 2
647 #define LSA_GR_ADDRESS 3
648
649 /* OSPF Router Information (RI) TLVs */
650 /* https://www.iana.org/assignments/ospf-parameters/ospf-parameters.xhtml#ri-tlv */
651 #define LSA_RI_RIC 1
652 #define LSA_RI_RFC 2
653
654 /* OSPF Router Informational Capability Bits */
655 /* https://www.iana.org/assignments/ospf-parameters/ospf-parameters.xhtml#router-informational-capability */
656 #define LSA_RIC_GR_CAPABLE 0
657 #define LSA_RIC_GR_HELPER 1
658 #define LSA_RIC_STUB_ROUTER 2
659
660
661 struct ospf_lsa_header
662 {
663 u16 age; /* LS Age */
664 u16 type_raw; /* Type, mixed with options on OSPFv2 */
665
666 u32 id;
667 u32 rt; /* Advertising router */
668 s32 sn; /* LS Sequence number */
669 u16 checksum;
670 u16 length;
671 };
672
673
674 /* In OSPFv2, options are embedded in higher half of type_raw */
675 static inline u8 lsa_get_options(struct ospf_lsa_header *lsa)
676 { return lsa->type_raw >> 8; }
677
678 static inline void lsa_set_options(struct ospf_lsa_header *lsa, u16 options)
679 { lsa->type_raw = (lsa->type_raw & 0xff) | (options << 8); }
680
681
682 struct ospf_lsa_rt
683 {
684 u32 options; /* VEB flags, mixed with link count for OSPFv2 and options for OSPFv3 */
685 };
686
687 struct ospf_lsa_rt2_link
688 {
689 u32 id;
690 u32 data;
691 #ifdef CPU_BIG_ENDIAN
692 u8 type;
693 u8 no_tos;
694 u16 metric;
695 #else
696 u16 metric;
697 u8 no_tos;
698 u8 type;
699 #endif
700 };
701
702 struct ospf_lsa_rt2_tos
703 {
704 #ifdef CPU_BIG_ENDIAN
705 u8 tos;
706 u8 padding;
707 u16 metric;
708 #else
709 u16 metric;
710 u8 padding;
711 u8 tos;
712 #endif
713 };
714
715 struct ospf_lsa_rt3_link
716 {
717 #ifdef CPU_BIG_ENDIAN
718 u8 type;
719 u8 padding;
720 u16 metric;
721 #else
722 u16 metric;
723 u8 padding;
724 u8 type;
725 #endif
726 u32 lif; /* Local interface ID */
727 u32 nif; /* Neighbor interface ID */
728 u32 id; /* Neighbor router ID */
729 };
730
731
732 struct ospf_lsa_net
733 {
734 u32 optx; /* Netmask for OSPFv2, options for OSPFv3 */
735 u32 routers[];
736 };
737
738 struct ospf_lsa_sum2
739 {
740 u32 netmask;
741 u32 metric;
742 };
743
744 struct ospf_lsa_sum3_net
745 {
746 u32 metric;
747 u32 prefix[];
748 };
749
750 struct ospf_lsa_sum3_rt
751 {
752 u32 options;
753 u32 metric;
754 u32 drid;
755 };
756
757 struct ospf_lsa_ext2
758 {
759 u32 netmask;
760 u32 metric;
761 u32 fwaddr;
762 u32 tag;
763 };
764
765 struct ospf_lsa_ext3
766 {
767 u32 metric;
768 u32 rest[];
769 };
770
771 struct ospf_lsa_ext_local
772 {
773 net_addr net;
774 ip_addr fwaddr;
775 u32 metric, ebit, fbit, tag, propagate, downwards;
776 u8 pxopts;
777 };
778
779 struct ospf_lsa_link
780 {
781 u32 options;
782 ip6_addr lladdr;
783 u32 pxcount;
784 u32 rest[];
785 };
786
787 struct ospf_lsa_prefix
788 {
789 #ifdef CPU_BIG_ENDIAN
790 u16 pxcount;
791 u16 ref_type;
792 #else
793 u16 ref_type;
794 u16 pxcount;
795 #endif
796 u32 ref_id;
797 u32 ref_rt;
798 u32 rest[];
799 };
800
801 struct ospf_tlv
802 {
803 #ifdef CPU_BIG_ENDIAN
804 u16 type;
805 u16 length;
806 #else
807 u16 length;
808 u16 type;
809 #endif
810 u32 data[];
811 };
812
813
814 static inline uint
815 lsa_net_count(struct ospf_lsa_header *lsa)
816 {
817 return (lsa->length - sizeof(struct ospf_lsa_header) - sizeof(struct ospf_lsa_net))
818 / sizeof(u32);
819 }
820
821 /* In ospf_area->rtr we store paths to routers, but we use RID (and not IP address)
822 as index, so we need to encapsulate RID to IP address */
823
824 #define net_from_rid(x) NET_ADDR_IP4(ip4_from_u32(x), IP4_MAX_PREFIX_LENGTH)
825 #define rid_from_net(x) ip4_to_u32(((net_addr_ip4 *) x)->prefix)
826
827 #define IPV6_PREFIX_SPACE(x) ((((x) + 63) / 32) * 4)
828 #define IPV6_PREFIX_WORDS(x) (((x) + 63) / 32)
829
830
831 static inline int
832 ospf_valid_prefix(net_addr *n)
833 {
834 /*
835 * In OSPFv2, prefix is stored as netmask; ip4_masklen() returns 255 for
836 * invalid one. But OSPFv3-AF may receive IPv4 net with 32 < pxlen < 128.
837 */
838 uint max = (n->type == NET_IP4) ? IP4_MAX_PREFIX_LENGTH : IP6_MAX_PREFIX_LENGTH;
839 return n->pxlen <= max;
840 }
841
842 /*
843 * In OSPFv3-AF (RFC 5835), IPv4 address is encoded by just placing it in the
844 * first 32 bits of IPv6 address and setting remaining bits to zero. Likewise
845 * for IPv4 prefix, where remaining bits do not matter. We use following
846 * functions to convert between IPv4 and IPv4-in-IPv6 representations:
847 */
848
849 static inline ip4_addr ospf3_6to4(ip6_addr a)
850 { return _MI4(_I0(a)); }
851
852 static inline ip6_addr ospf3_4to6(ip4_addr a)
853 { return _MI6(_I(a), 0, 0, 0); }
854
855
856 static inline u32 *
857 ospf3_get_prefix(u32 *buf, int af, net_addr *n, u8 *pxopts, u16 *rest)
858 {
859 ip6_addr px = IP6_NONE;
860 uint pxlen = (*buf >> 24);
861 *pxopts = (*buf >> 16) & 0xff;
862 if (rest) *rest = *buf & 0xffff;
863 buf++;
864
865 if (pxlen > 0)
866 _I0(px) = *buf++;
867 if (pxlen > 32)
868 _I1(px) = *buf++;
869 if (pxlen > 64)
870 _I2(px) = *buf++;
871 if (pxlen > 96)
872 _I3(px) = *buf++;
873
874 /* Clean up remaining bits */
875 if (pxlen < 128)
876 px.addr[pxlen / 32] &= u32_mkmask(pxlen % 32);
877
878 if (af == NET_IP4)
879 net_fill_ip4(n, ospf3_6to4(px), pxlen);
880 else
881 net_fill_ip6(n, px, pxlen);
882
883 return buf;
884 }
885
886 static inline u32 *
887 ospf3_put_prefix(u32 *buf, net_addr *n, u8 pxopts, u16 rest)
888 {
889 ip6_addr px = (n->type == NET_IP4) ? ospf3_4to6(net4_prefix(n)) : net6_prefix(n);
890 uint pxlen = n->pxlen;
891
892 *buf++ = ((pxlen << 24) | (pxopts << 16) | rest);
893
894 if (pxlen > 0)
895 *buf++ = _I0(px);
896 if (pxlen > 32)
897 *buf++ = _I1(px);
898 if (pxlen > 64)
899 *buf++ = _I2(px);
900 if (pxlen > 96)
901 *buf++ = _I3(px);
902
903 return buf;
904 }
905
906 static inline u32 *
907 ospf3_get_addr(u32 *buf, int af, ip_addr *addr)
908 {
909 ip6_addr a;
910 memcpy(&a, buf, 16);
911 *addr = (af == NET_IP4) ? ipa_from_ip4(ospf3_6to4(a)) : ipa_from_ip6(a);
912 return buf + 4;
913 }
914
915 static inline u32 *
916 ospf3_put_addr(u32 *buf, ip_addr addr)
917 {
918 ip6_addr a = ipa_is_ip4(addr) ? ospf3_4to6(ipa_to_ip4(addr)) : ipa_to_ip6(addr);
919 memcpy(buf, &a, 16);
920 return buf + 4;
921 }
922
923
924 struct ospf_lsreq_header
925 {
926 u32 type;
927 u32 id;
928 u32 rt;
929 };
930
931
932
933 #define SH_ROUTER_SELF 0xffffffff
934
935 struct lsadb_show_data {
936 struct ospf_proto *proto; /* Protocol to request data from */
937 u16 type; /* LSA Type, 0 -> all */
938 u16 scope; /* Scope, 0 -> all, hack to handle link scope as 1 */
939 u32 area; /* Specified for area scope */
940 u32 lsid; /* LSA ID, 0 -> all */
941 u32 router; /* Advertising router, 0 -> all */
942 };
943
944
945 #define EA_OSPF_METRIC1 EA_CODE(PROTOCOL_OSPF, 0)
946 #define EA_OSPF_METRIC2 EA_CODE(PROTOCOL_OSPF, 1)
947 #define EA_OSPF_TAG EA_CODE(PROTOCOL_OSPF, 2)
948 #define EA_OSPF_ROUTER_ID EA_CODE(PROTOCOL_OSPF, 3)
949
950
951 /*
952 * For regular networks, neighbor address must match network prefix.
953 * For unnumbered networks, we consider every address local.
954 */
955 static inline int ospf_ipa_local(ip_addr a, const struct ifa *addr)
956 { return ipa_in_netX(a, &addr->prefix) || (addr->flags & IA_HOST); }
957
958
959 /* ospf.c */
960 void ospf_schedule_rtcalc(struct ospf_proto *p);
961
962 static inline void ospf_notify_rt_lsa(struct ospf_area *oa)
963 { oa->update_rt_lsa = 1; }
964
965 static inline void ospf_notify_net_lsa(struct ospf_iface *ifa)
966 { ifa->update_net_lsa = 1; }
967
968 static inline void ospf_notify_link_lsa(struct ospf_iface *ifa)
969 { ifa->update_link_lsa = 1; }
970
971 static inline int ospf_is_v2(struct ospf_proto *p)
972 { return p->ospf2; }
973
974 static inline int ospf_is_v3(struct ospf_proto *p)
975 { return ! p->ospf2; }
976
977 static inline int ospf_get_version(struct ospf_proto *p)
978 { return ospf_is_v2(p) ? 2 : 3; }
979
980 static inline int ospf_is_ip4(struct ospf_proto *p)
981 { return p->p.net_type == NET_IP4; }
982
983 static inline int ospf_is_ip6(struct ospf_proto *p)
984 { return p->p.net_type == NET_IP6; }
985
986 static inline int ospf_get_af(struct ospf_proto *p)
987 { return p->p.net_type; }
988
989 struct ospf_area *ospf_find_area(struct ospf_proto *p, u32 aid);
990
991 static inline struct ospf_area *ospf_main_area(struct ospf_proto *p)
992 { return (p->areano == 1) ? HEAD(p->area_list) : p->backbone; }
993
994 static inline int oa_is_stub(struct ospf_area *oa)
995 { return (oa->options & (OPT_E | OPT_N)) == 0; }
996
997 static inline int oa_is_ext(struct ospf_area *oa)
998 { return oa->options & OPT_E; }
999
1000 static inline int oa_is_nssa(struct ospf_area *oa)
1001 { return oa->options & OPT_N; }
1002
1003 void ospf_stop_gr_recovery(struct ospf_proto *p);
1004
1005 void ospf_sh_neigh(struct proto *P, const char *iff);
1006 void ospf_sh(struct proto *P);
1007 void ospf_sh_iface(struct proto *P, const char *iff);
1008 void ospf_sh_state(struct proto *P, int verbose, int reachable);
1009
1010 void ospf_sh_lsadb(struct lsadb_show_data *ld);
1011
1012 /* iface.c */
1013 void ospf_iface_chstate(struct ospf_iface *ifa, u8 state);
1014 void ospf_iface_sm(struct ospf_iface *ifa, int event);
1015 struct ospf_iface *ospf_iface_find(struct ospf_proto *p, struct iface *what);
1016 void ospf_if_notify(struct proto *P, uint flags, struct iface *iface);
1017 void ospf_ifa_notify2(struct proto *P, uint flags, struct ifa *a);
1018 void ospf_ifa_notify3(struct proto *P, uint flags, struct ifa *a);
1019 void ospf_iface_info(struct ospf_iface *ifa);
1020 void ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *ip);
1021 void ospf_iface_new_vlink(struct ospf_proto *p, struct ospf_iface_patt *ip);
1022 void ospf_iface_remove(struct ospf_iface *ifa);
1023 void ospf_iface_shutdown(struct ospf_iface *ifa);
1024 int ospf_iface_assure_bufsize(struct ospf_iface *ifa, uint plen);
1025 int ospf_iface_reconfigure(struct ospf_iface *ifa, struct ospf_iface_patt *new);
1026 void ospf_reconfigure_ifaces(struct ospf_proto *p);
1027 void ospf_open_vlink_sk(struct ospf_proto *p);
1028 struct nbma_node *find_nbma_node_(list *nnl, ip_addr ip);
1029
1030 static inline struct nbma_node * find_nbma_node(struct ospf_iface *ifa, ip_addr ip)
1031 { return find_nbma_node_(&ifa->nbma_list, ip); }
1032
1033 static inline u32 ospf_iface_get_data(struct ospf_iface *ifa)
1034 {
1035 /*
1036 * Return expected value of the link data field in Rt-LSA for given iface.
1037 * It should be ifa->iface_id for unnumbered PtP links, IP address otherwise
1038 * (see RFC 2328 12.4.1.1). It is controlled by ifa->ptp_address field so it
1039 * can be overriden for compatibility purposes.
1040 */
1041
1042 return ((ifa->type == OSPF_IT_PTP) && !ifa->ptp_address) ?
1043 ifa->iface_id :
1044 ipa_to_u32(ifa->addr->ip);
1045 }
1046
1047 /* neighbor.c */
1048 struct ospf_neighbor *ospf_neighbor_new(struct ospf_iface *ifa);
1049 void ospf_neigh_sm(struct ospf_neighbor *n, int event);
1050 void ospf_neigh_cancel_graceful_restart(struct ospf_neighbor *n);
1051 void ospf_neigh_notify_grace_lsa(struct ospf_neighbor *n, struct top_hash_entry *en);
1052 void ospf_neigh_lsadb_changed_(struct ospf_proto *p, struct top_hash_entry *en);
1053 void ospf_dr_election(struct ospf_iface *ifa);
1054 struct ospf_neighbor *find_neigh(struct ospf_iface *ifa, u32 rid);
1055 struct ospf_neighbor *find_neigh_by_ip(struct ospf_iface *ifa, ip_addr ip);
1056 void ospf_neigh_update_bfd(struct ospf_neighbor *n, int use_bfd);
1057 void ospf_sh_neigh_info(struct ospf_neighbor *n);
1058
1059 static inline void ospf_neigh_lsadb_changed(struct ospf_proto *p, struct top_hash_entry *en)
1060 { if (p->gr_count) ospf_neigh_lsadb_changed_(p, en); }
1061
1062 /* packet.c */
1063 void ospf_pkt_fill_hdr(struct ospf_iface *ifa, void *buf, u8 h_type);
1064 int ospf_rx_hook(sock * sk, uint size);
1065 // void ospf_tx_hook(sock * sk);
1066 void ospf_err_hook(sock * sk, int err);
1067 void ospf_verr_hook(sock *sk, int err);
1068 void ospf_send_to(struct ospf_iface *ifa, ip_addr ip);
1069 void ospf_send_to_iface(struct ospf_iface *ifa);
1070
1071 static inline void ospf_send_to_nbr(struct ospf_iface *ifa, struct ospf_neighbor *n)
1072 { ospf_send_to(ifa, (ifa->type == OSPF_IT_PTP) ? ifa->all_routers : n->ip); }
1073
1074 static inline void ospf_send_to_all(struct ospf_iface *ifa)
1075 { ospf_send_to(ifa, ifa->all_routers); }
1076
1077 static inline uint ospf_pkt_maxsize(struct ospf_iface *ifa)
1078 { return ifa->tx_length - ifa->tx_hdrlen; }
1079
1080 #ifndef PARSER
1081 #define DROP(DSC,VAL) do { err_dsc = DSC; err_val = VAL; goto drop; } while(0)
1082 #define DROP1(DSC) do { err_dsc = DSC; goto drop; } while(0)
1083 #define SKIP(DSC) do { err_dsc = DSC; goto skip; } while(0)
1084 #endif
1085
1086 static inline uint ospf_pkt_hdrlen(struct ospf_proto *p)
1087 { return ospf_is_v2(p) ? (sizeof(struct ospf_packet) + sizeof(union ospf_auth2)) : sizeof(struct ospf_packet); }
1088
1089 static inline void * ospf_tx_buffer(struct ospf_iface *ifa)
1090 { return ifa->sk->tbuf; }
1091
1092 /* hello.c */
1093 #define OHS_HELLO 0
1094 #define OHS_POLL 1
1095 #define OHS_SHUTDOWN 2
1096
1097 void ospf_send_hello(struct ospf_iface *ifa, int kind, struct ospf_neighbor *dirn);
1098 void ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n, ip_addr faddr);
1099 uint ospf_hello3_options(struct ospf_packet *pkt);
1100
1101 /* dbdes.c */
1102 void ospf_send_dbdes(struct ospf_proto *p, struct ospf_neighbor *n);
1103 void ospf_rxmt_dbdes(struct ospf_proto *p, struct ospf_neighbor *n);
1104 void ospf_reset_ldd(struct ospf_proto *p, struct ospf_neighbor *n);
1105 void ospf_receive_dbdes(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n);
1106 uint ospf_dbdes3_options(struct ospf_packet *pkt);
1107
1108 /* lsreq.c */
1109 void ospf_send_lsreq(struct ospf_proto *p, struct ospf_neighbor *n);
1110 void ospf_receive_lsreq(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n);
1111
1112 /* lsupd.c */
1113 void ospf_dump_lsahdr(struct ospf_proto *p, struct ospf_lsa_header *lsa_n);
1114 void ospf_dump_common(struct ospf_proto *p, struct ospf_packet *pkt);
1115 void ospf_lsa_lsrt_down_(struct top_hash_entry *en, struct ospf_neighbor *n, struct top_hash_entry *ret);
1116 void ospf_add_flushed_to_lsrt(struct ospf_proto *p, struct ospf_neighbor *n);
1117 void ospf_flood_event(void *ptr);
1118 int ospf_flood_lsa(struct ospf_proto *p, struct top_hash_entry *en, struct ospf_neighbor *from);
1119 int ospf_send_lsupd(struct ospf_proto *p, struct top_hash_entry **lsa_list, uint lsa_count, struct ospf_neighbor *n);
1120 void ospf_rxmt_lsupd(struct ospf_proto *p, struct ospf_neighbor *n);
1121 void ospf_receive_lsupd(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n);
1122
1123 /* lsack.c */
1124 void ospf_enqueue_lsack(struct ospf_neighbor *n, struct ospf_lsa_header *h_n, int queue);
1125 void ospf_reset_lsack_queue(struct ospf_neighbor *n);
1126 void ospf_send_lsack(struct ospf_proto *p, struct ospf_neighbor *n, int queue);
1127 void ospf_receive_lsack(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n);
1128
1129
1130 #include "proto/ospf/rt.h"
1131 #include "proto/ospf/topology.h"
1132 #include "proto/ospf/lsalib.h"
1133
1134 #endif /* _BIRD_OSPF_H_ */