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