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Merge pull request #12798 from donaldsharp/rib_match_multicast
[mirror_frr.git] / ospfd / ospf_sr.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * This is an implementation of Segment Routing
4 * as per RFC 8665 - OSPF Extensions for Segment Routing
5 * and RFC 8476 - Signaling Maximum SID Depth (MSD) Using OSPF
6 *
7 * Module name: Segment Routing
8 *
9 * Author: Olivier Dugeon <olivier.dugeon@orange.com>
10 * Author: Anselme Sawadogo <anselmesawadogo@gmail.com>
11 *
12 * Copyright (C) 2016 - 2020 Orange Labs http://www.orange.com
13 */
14
15 #ifdef HAVE_CONFIG_H
16 #include "config.h"
17 #endif
18
19 #include <math.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <zebra.h>
23
24 #include "printfrr.h"
25 #include "command.h"
26 #include "hash.h"
27 #include "if.h"
28 #include "if.h"
29 #include "jhash.h"
30 #include "libospf.h" /* for ospf interface types */
31 #include "linklist.h"
32 #include "log.h"
33 #include "memory.h"
34 #include "monotime.h"
35 #include "network.h"
36 #include "prefix.h"
37 #include "sockunion.h" /* for inet_aton() */
38 #include "stream.h"
39 #include "table.h"
40 #include "thread.h"
41 #include "vty.h"
42 #include "zclient.h"
43 #include "sbuf.h"
44 #include <lib/json.h>
45 #include "ospf_errors.h"
46
47 #include "ospfd/ospfd.h"
48 #include "ospfd/ospf_interface.h"
49 #include "ospfd/ospf_ism.h"
50 #include "ospfd/ospf_asbr.h"
51 #include "ospfd/ospf_lsa.h"
52 #include "ospfd/ospf_lsdb.h"
53 #include "ospfd/ospf_neighbor.h"
54 #include "ospfd/ospf_nsm.h"
55 #include "ospfd/ospf_flood.h"
56 #include "ospfd/ospf_packet.h"
57 #include "ospfd/ospf_spf.h"
58 #include "ospfd/ospf_dump.h"
59 #include "ospfd/ospf_route.h"
60 #include "ospfd/ospf_ase.h"
61 #include "ospfd/ospf_sr.h"
62 #include "ospfd/ospf_ri.h"
63 #include "ospfd/ospf_ext.h"
64 #include "ospfd/ospf_zebra.h"
65
66 /*
67 * Global variable to manage Segment Routing on this node.
68 * Note that all parameter values are stored in network byte order.
69 */
70 static struct ospf_sr_db OspfSR;
71 static void ospf_sr_register_vty(void);
72 static inline void del_adj_sid(struct sr_nhlfe nhlfe);
73 static int ospf_sr_start(struct ospf *ospf);
74
75 /*
76 * Segment Routing Data Base functions
77 */
78
79 /* Hash function for Segment Routing entry */
80 static unsigned int sr_hash(const void *p)
81 {
82 const struct in_addr *rid = p;
83
84 return jhash_1word(rid->s_addr, 0);
85 }
86
87 /* Compare 2 Router ID hash entries based on SR Node */
88 static bool sr_cmp(const void *p1, const void *p2)
89 {
90 const struct sr_node *srn = p1;
91 const struct in_addr *rid = p2;
92
93 return IPV4_ADDR_SAME(&srn->adv_router, rid);
94 }
95
96 /* Functions to remove an SR Link */
97 static void del_sr_link(void *val)
98 {
99 struct sr_link *srl = (struct sr_link *)val;
100
101 del_adj_sid(srl->nhlfe[0]);
102 del_adj_sid(srl->nhlfe[1]);
103 XFREE(MTYPE_OSPF_SR_PARAMS, val);
104 }
105
106 /* Functions to remove an SR Prefix */
107 static void del_sr_pref(void *val)
108 {
109 struct sr_prefix *srp = (struct sr_prefix *)val;
110
111 ospf_zebra_delete_prefix_sid(srp);
112 XFREE(MTYPE_OSPF_SR_PARAMS, val);
113 }
114
115 /* Allocate new Segment Routine node */
116 static struct sr_node *sr_node_new(struct in_addr *rid)
117 {
118
119 if (rid == NULL)
120 return NULL;
121
122 struct sr_node *new;
123
124 /* Allocate Segment Routing node memory */
125 new = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_node));
126
127 /* Default Algorithm, SRGB and MSD */
128 for (int i = 0; i < ALGORITHM_COUNT; i++)
129 new->algo[i] = SR_ALGORITHM_UNSET;
130
131 new->srgb.range_size = 0;
132 new->srgb.lower_bound = 0;
133 new->msd = 0;
134
135 /* Create Link, Prefix and Range TLVs list */
136 new->ext_link = list_new();
137 new->ext_prefix = list_new();
138 new->ext_link->del = del_sr_link;
139 new->ext_prefix->del = del_sr_pref;
140
141 IPV4_ADDR_COPY(&new->adv_router, rid);
142 new->neighbor = NULL;
143 new->instance = 0;
144
145 osr_debug(" |- Created new SR node for %pI4", &new->adv_router);
146 return new;
147 }
148
149 /* Supposed to be used for testing */
150 struct sr_node *ospf_sr_node_create(struct in_addr *rid)
151 {
152 struct sr_node *srn;
153
154 srn = hash_get(OspfSR.neighbors, (void *)rid, (void *)sr_node_new);
155
156 return srn;
157 }
158
159 /* Delete Segment Routing node */
160 static void sr_node_del(struct sr_node *srn)
161 {
162 /* Sanity Check */
163 if (srn == NULL)
164 return;
165
166 osr_debug(" |- Delete SR node for %pI4", &srn->adv_router);
167
168 /* Clean Extended Link */
169 list_delete(&srn->ext_link);
170
171 /* Clean Prefix List */
172 list_delete(&srn->ext_prefix);
173
174 XFREE(MTYPE_OSPF_SR_PARAMS, srn);
175 }
176
177 /* Get SR Node for a given nexthop */
178 static struct sr_node *get_sr_node_by_nexthop(struct ospf *ospf,
179 struct in_addr nexthop)
180 {
181 struct ospf_interface *oi = NULL;
182 struct ospf_neighbor *nbr = NULL;
183 struct listnode *node;
184 struct route_node *rn;
185 struct sr_node *srn;
186 bool found;
187
188 /* Sanity check */
189 if (OspfSR.neighbors == NULL)
190 return NULL;
191
192 osr_debug(" |- Search SR-Node for nexthop %pI4", &nexthop);
193
194 /* First, search neighbor Router ID for this nexthop */
195 found = false;
196 for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi)) {
197 for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
198 nbr = rn->info;
199 if ((nbr) && (IPV4_ADDR_SAME(&nexthop, &nbr->src))) {
200 found = true;
201 break;
202 }
203 }
204 if (found)
205 break;
206 }
207
208 if (!found)
209 return NULL;
210
211 osr_debug(" |- Found nexthop Router ID %pI4", &nbr->router_id);
212
213 /* Then, search SR Node */
214 srn = (struct sr_node *)hash_lookup(OspfSR.neighbors, &nbr->router_id);
215
216 return srn;
217 }
218
219 /*
220 * Segment Routing Local Block management functions
221 */
222
223 /**
224 * It is necessary to known which label is already allocated to manage the range
225 * of SRLB. This is particular useful when an interface flap (goes up / down
226 * frequently). Here, SR will release and then allocate label for the Adjacency
227 * for each concerned interface. If we don't care, there is a risk to run out of
228 * label.
229 *
230 * For that purpose, a similar principle as already provided to manage chunk of
231 * label is proposed. But, here, the label chunk has not a fix range of 64
232 * labels that could be easily manage with a single variable of 64 bits size.
233 * So, used_mark is used as a bit wise to mark label reserved (bit set) or not
234 * (bit unset). Its size is equal to the number of label of the SRLB range round
235 * up to 64 bits.
236 *
237 * - sr__local_block_init() computes the number of 64 bits variables that are
238 * needed to manage the SRLB range and allocates this number.
239 * - ospf_sr_local_block_request_label() pick up the first available label and
240 * set corresponding bit
241 * - ospf_sr_local_block_release_label() release label by reseting the
242 * corresponding bit and set the next label to the first free position
243 */
244
245 /**
246 * Initialize Segment Routing Local Block from SRDB configuration and reserve
247 * block of bits to manage label allocation.
248 *
249 * @param lower_bound The lower bound of the SRLB range
250 * @param upper_bound The upper bound of the SRLB range
251 *
252 * @return 0 on success, -1 otherwise
253 */
254 static int sr_local_block_init(uint32_t lower_bound, uint32_t upper_bound)
255 {
256 struct sr_local_block *srlb = &OspfSR.srlb;
257 uint32_t size;
258
259 /* Check if SRLB is not already configured */
260 if (srlb->reserved)
261 return 0;
262
263 /*
264 * Request SRLB to the label manager. If the allocation fails, return
265 * an error to disable SR until a new SRLB is successfully allocated.
266 */
267 size = upper_bound - lower_bound + 1;
268 if (ospf_zebra_request_label_range(lower_bound, size)) {
269 zlog_err("SR: Error reserving SRLB [%u/%u] %u labels",
270 lower_bound, upper_bound, size);
271 return -1;
272 }
273
274 osr_debug("SR: Got new SRLB [%u/%u], %u labels", lower_bound,
275 upper_bound, size);
276
277 /* Initialize the SRLB */
278 srlb->start = lower_bound;
279 srlb->end = upper_bound;
280 srlb->current = 0;
281
282 /* Compute the needed Used Mark number and allocate them */
283 srlb->max_block = size / SRLB_BLOCK_SIZE;
284 if ((size % SRLB_BLOCK_SIZE) != 0)
285 srlb->max_block++;
286 srlb->used_mark = XCALLOC(MTYPE_OSPF_SR_PARAMS,
287 srlb->max_block * SRLB_BLOCK_SIZE);
288 srlb->reserved = true;
289
290 return 0;
291 }
292
293 static int sr_global_block_init(uint32_t start, uint32_t size)
294 {
295 struct sr_global_block *srgb = &OspfSR.srgb;
296
297 /* Check if already configured */
298 if (srgb->reserved)
299 return 0;
300
301 /* request chunk */
302 uint32_t end = start + size - 1;
303 if (ospf_zebra_request_label_range(start, size) < 0) {
304 zlog_err("SR: Error reserving SRGB [%u/%u], %u labels", start,
305 end, size);
306 return -1;
307 }
308
309 osr_debug("SR: Got new SRGB [%u/%u], %u labels", start, end, size);
310
311 /* success */
312 srgb->start = start;
313 srgb->size = size;
314 srgb->reserved = true;
315 return 0;
316 }
317
318 /**
319 * Remove Segment Routing Local Block.
320 *
321 */
322 static void sr_local_block_delete(void)
323 {
324 struct sr_local_block *srlb = &OspfSR.srlb;
325
326 /* Check if SRLB is not already delete */
327 if (!srlb->reserved)
328 return;
329
330 osr_debug("SR (%s): Remove SRLB [%u/%u]", __func__, srlb->start,
331 srlb->end);
332
333 /* First release the label block */
334 ospf_zebra_release_label_range(srlb->start, srlb->end);
335
336 /* Then reset SRLB structure */
337 if (srlb->used_mark != NULL)
338 XFREE(MTYPE_OSPF_SR_PARAMS, srlb->used_mark);
339
340 srlb->reserved = false;
341 }
342
343 /**
344 * Remove Segment Routing Global block
345 */
346 static void sr_global_block_delete(void)
347 {
348 struct sr_global_block *srgb = &OspfSR.srgb;
349
350 if (!srgb->reserved)
351 return;
352
353 osr_debug("SR (%s): Remove SRGB [%u/%u]", __func__, srgb->start,
354 srgb->start + srgb->size - 1);
355
356 ospf_zebra_release_label_range(srgb->start,
357 srgb->start + srgb->size - 1);
358
359 srgb->reserved = false;
360 }
361
362
363 /**
364 * Request a label from the Segment Routing Local Block.
365 *
366 * @return First available label on success or MPLS_INVALID_LABEL if the
367 * block of labels is full
368 */
369 mpls_label_t ospf_sr_local_block_request_label(void)
370 {
371 struct sr_local_block *srlb = &OspfSR.srlb;
372 mpls_label_t label;
373 uint32_t index;
374 uint32_t pos;
375 uint32_t size = srlb->end - srlb->start + 1;
376
377 /* Check if we ran out of available labels */
378 if (srlb->current >= size)
379 return MPLS_INVALID_LABEL;
380
381 /* Get first available label and mark it used */
382 label = srlb->current + srlb->start;
383 index = srlb->current / SRLB_BLOCK_SIZE;
384 pos = 1ULL << (srlb->current % SRLB_BLOCK_SIZE);
385 srlb->used_mark[index] |= pos;
386
387 /* Jump to the next free position */
388 srlb->current++;
389 pos = srlb->current % SRLB_BLOCK_SIZE;
390 while (srlb->current < size) {
391 if (pos == 0)
392 index++;
393 if (!((1ULL << pos) & srlb->used_mark[index]))
394 break;
395 else {
396 srlb->current++;
397 pos = srlb->current % SRLB_BLOCK_SIZE;
398 }
399 }
400
401 if (srlb->current == size)
402 zlog_warn(
403 "SR: Warning, SRLB is depleted and next label request will fail");
404
405 return label;
406 }
407
408 /**
409 * Release label in the Segment Routing Local Block.
410 *
411 * @param label Label to be release
412 *
413 * @return 0 on success or -1 if label falls outside SRLB
414 */
415 int ospf_sr_local_block_release_label(mpls_label_t label)
416 {
417 struct sr_local_block *srlb = &OspfSR.srlb;
418 uint32_t index;
419 uint32_t pos;
420
421 /* Check that label falls inside the SRLB */
422 if ((label < srlb->start) || (label > srlb->end)) {
423 flog_warn(EC_OSPF_SR_SID_OVERFLOW,
424 "%s: Returning label %u is outside SRLB [%u/%u]",
425 __func__, label, srlb->start, srlb->end);
426 return -1;
427 }
428
429 index = (label - srlb->start) / SRLB_BLOCK_SIZE;
430 pos = 1ULL << ((label - srlb->start) % SRLB_BLOCK_SIZE);
431 srlb->used_mark[index] &= ~pos;
432 /* Reset current to the first available position */
433 for (index = 0; index < srlb->max_block; index++) {
434 if (srlb->used_mark[index] != 0xFFFFFFFFFFFFFFFF) {
435 for (pos = 0; pos < SRLB_BLOCK_SIZE; pos++)
436 if (!((1ULL << pos) & srlb->used_mark[index])) {
437 srlb->current =
438 index * SRLB_BLOCK_SIZE + pos;
439 break;
440 }
441 break;
442 }
443 }
444
445 return 0;
446 }
447
448 /*
449 * Segment Routing Initialization functions
450 */
451
452 /**
453 * Thread function to re-attempt connection to the Label Manager and thus be
454 * able to start Segment Routing.
455 *
456 * @param start Thread structure that contains area as argument
457 *
458 * @return 1 on success
459 */
460 static void sr_start_label_manager(struct thread *start)
461 {
462 struct ospf *ospf;
463
464 ospf = THREAD_ARG(start);
465
466 /* re-attempt to start SR & Label Manager connection */
467 ospf_sr_start(ospf);
468 }
469
470 /* Segment Routing starter function */
471 static int ospf_sr_start(struct ospf *ospf)
472 {
473 struct route_node *rn;
474 struct ospf_lsa *lsa;
475 struct sr_node *srn;
476 int rc = 0;
477
478 osr_debug("SR (%s): Start Segment Routing", __func__);
479
480 /* Initialize self SR Node if not already done */
481 if (OspfSR.self == NULL) {
482 srn = hash_get(OspfSR.neighbors, (void *)&(ospf->router_id),
483 (void *)sr_node_new);
484
485 /* Complete & Store self SR Node */
486 srn->srgb.range_size = OspfSR.srgb.size;
487 srn->srgb.lower_bound = OspfSR.srgb.start;
488 srn->srlb.lower_bound = OspfSR.srlb.start;
489 srn->srlb.range_size = OspfSR.srlb.end - OspfSR.srlb.start + 1;
490 srn->algo[0] = OspfSR.algo[0];
491 srn->msd = OspfSR.msd;
492 OspfSR.self = srn;
493 }
494
495 /* Then, start Label Manager if not ready */
496 if (!ospf_zebra_label_manager_ready())
497 if (ospf_zebra_label_manager_connect() < 0) {
498 /* Re-attempt to connect to Label Manager in 1 sec. */
499 thread_add_timer(master, sr_start_label_manager, ospf,
500 1, &OspfSR.t_start_lm);
501 osr_debug(" |- Failed to start the Label Manager");
502 return -1;
503 }
504
505 /*
506 * Request SRLB & SGRB to the label manager if not already reserved.
507 * If the allocation fails, return an error to disable SR until a new
508 * SRLB and/or SRGB are successfully allocated.
509 */
510 if (sr_local_block_init(OspfSR.srlb.start, OspfSR.srlb.end) < 0)
511 return -1;
512
513 if (sr_global_block_init(OspfSR.srgb.start, OspfSR.srgb.size) < 0)
514 return -1;
515
516 /* SR is UP and ready to flood LSA */
517 OspfSR.status = SR_UP;
518
519 /* Set Router Information SR parameters */
520 osr_debug("SR: Activate SR for Router Information LSA");
521
522 ospf_router_info_update_sr(true, OspfSR.self);
523
524 /* Update Ext LSA */
525 osr_debug("SR: Activate SR for Extended Link/Prefix LSA");
526
527 ospf_ext_update_sr(true);
528
529 osr_debug("SR (%s): Update SR-DB from LSDB", __func__);
530
531 /* Start by looking to Router Info & Extended LSA in lsdb */
532 if ((ospf != NULL) && (ospf->backbone != NULL)) {
533 LSDB_LOOP (OPAQUE_AREA_LSDB(ospf->backbone), rn, lsa) {
534 if (IS_LSA_MAXAGE(lsa) || IS_LSA_SELF(lsa))
535 continue;
536 int lsa_id =
537 GET_OPAQUE_TYPE(ntohl(lsa->data->id.s_addr));
538 switch (lsa_id) {
539 case OPAQUE_TYPE_ROUTER_INFORMATION_LSA:
540 ospf_sr_ri_lsa_update(lsa);
541 break;
542 case OPAQUE_TYPE_EXTENDED_PREFIX_LSA:
543 ospf_sr_ext_prefix_lsa_update(lsa);
544 break;
545 case OPAQUE_TYPE_EXTENDED_LINK_LSA:
546 ospf_sr_ext_link_lsa_update(lsa);
547 break;
548 default:
549 break;
550 }
551 }
552 }
553
554 rc = 1;
555 return rc;
556 }
557
558 /* Stop Segment Routing */
559 static void ospf_sr_stop(void)
560 {
561
562 if (OspfSR.status == SR_OFF)
563 return;
564
565 osr_debug("SR (%s): Stop Segment Routing", __func__);
566
567 /* Disable any re-attempt to connect to Label Manager */
568 THREAD_OFF(OspfSR.t_start_lm);
569
570 /* Release SRGB if active */
571 sr_global_block_delete();
572
573 /* Release SRLB if active */
574 sr_local_block_delete();
575
576 /*
577 * Remove all SR Nodes from the Hash table. Prefix and Link SID will
578 * be remove though list_delete() call. See sr_node_del()
579 */
580 hash_clean(OspfSR.neighbors, (void *)sr_node_del);
581 OspfSR.self = NULL;
582 OspfSR.status = SR_OFF;
583 }
584
585 /*
586 * Segment Routing initialize function
587 *
588 * @param - nothing
589 *
590 * @return 0 if OK, -1 otherwise
591 */
592 int ospf_sr_init(void)
593 {
594 int rc = -1;
595
596 osr_debug("SR (%s): Initialize SR Data Base", __func__);
597
598 memset(&OspfSR, 0, sizeof(OspfSR));
599 OspfSR.status = SR_OFF;
600 /* Only AREA flooding is supported in this release */
601 OspfSR.scope = OSPF_OPAQUE_AREA_LSA;
602
603 /* Initialize Algorithms, SRGB, SRLB and MSD TLVs */
604 /* Only Algorithm SPF is supported */
605 OspfSR.algo[0] = SR_ALGORITHM_SPF;
606 for (int i = 1; i < ALGORITHM_COUNT; i++)
607 OspfSR.algo[i] = SR_ALGORITHM_UNSET;
608
609 OspfSR.srgb.size = DEFAULT_SRGB_SIZE;
610 OspfSR.srgb.start = DEFAULT_SRGB_LABEL;
611 OspfSR.srgb.reserved = false;
612
613 OspfSR.srlb.start = DEFAULT_SRLB_LABEL;
614 OspfSR.srlb.end = DEFAULT_SRLB_END;
615 OspfSR.srlb.reserved = false;
616 OspfSR.msd = 0;
617
618 /* Initialize Hash table for neighbor SR nodes */
619 OspfSR.neighbors = hash_create(sr_hash, sr_cmp, "OSPF_SR");
620 if (OspfSR.neighbors == NULL)
621 return rc;
622
623 /* Register Segment Routing VTY command */
624 ospf_sr_register_vty();
625
626 rc = 0;
627 return rc;
628 }
629
630 /*
631 * Segment Routing termination function
632 *
633 * @param - nothing
634 * @return - nothing
635 */
636 void ospf_sr_term(void)
637 {
638
639 /* Stop Segment Routing */
640 ospf_sr_stop();
641
642 /* Clear SR Node Table */
643 if (OspfSR.neighbors)
644 hash_free(OspfSR.neighbors);
645
646 }
647
648 /*
649 * Segment Routing finish function
650 *
651 * @param - nothing
652 * @return - nothing
653 */
654 void ospf_sr_finish(void)
655 {
656 /* Stop Segment Routing */
657 ospf_sr_stop();
658 }
659
660 /*
661 * Following functions are used to manipulate the
662 * Next Hop Label Forwarding entry (NHLFE)
663 */
664
665 /* Compute label from index */
666 static mpls_label_t index2label(uint32_t index, struct sr_block srgb)
667 {
668 mpls_label_t label;
669
670 label = srgb.lower_bound + index;
671 if (label > (srgb.lower_bound + srgb.range_size)) {
672 flog_warn(EC_OSPF_SR_SID_OVERFLOW,
673 "%s: SID index %u falls outside SRGB range",
674 __func__, index);
675 return MPLS_INVALID_LABEL;
676 } else
677 return label;
678 }
679
680 /* Get the prefix sid for a specific router id */
681 mpls_label_t ospf_sr_get_prefix_sid_by_id(struct in_addr *id)
682 {
683 struct sr_node *srn;
684 struct sr_prefix *srp;
685 mpls_label_t label;
686
687 srn = (struct sr_node *)hash_lookup(OspfSR.neighbors, id);
688
689 if (srn) {
690 /*
691 * TODO: Here we assume that the SRGBs are the same,
692 * and that the node's prefix SID is at the head of
693 * the list, probably needs tweaking.
694 */
695 srp = listnode_head(srn->ext_prefix);
696 label = index2label(srp->sid, srn->srgb);
697 } else {
698 label = MPLS_INVALID_LABEL;
699 }
700
701 return label;
702 }
703
704 /* Get the adjacency sid for a specific 'root' id and 'neighbor' id */
705 mpls_label_t ospf_sr_get_adj_sid_by_id(struct in_addr *root_id,
706 struct in_addr *neighbor_id)
707 {
708 struct sr_node *srn;
709 struct sr_link *srl;
710 mpls_label_t label;
711 struct listnode *node;
712
713 srn = (struct sr_node *)hash_lookup(OspfSR.neighbors, root_id);
714
715 label = MPLS_INVALID_LABEL;
716
717 if (srn) {
718 for (ALL_LIST_ELEMENTS_RO(srn->ext_link, node, srl)) {
719 if (srl->type == ADJ_SID
720 && srl->remote_id.s_addr == neighbor_id->s_addr) {
721 label = srl->sid[0];
722 break;
723 }
724 }
725 }
726
727 return label;
728 }
729
730 /* Get neighbor full structure from address */
731 static struct ospf_neighbor *get_neighbor_by_addr(struct ospf *top,
732 struct in_addr addr)
733 {
734 struct ospf_neighbor *nbr;
735 struct ospf_interface *oi;
736 struct listnode *node;
737 struct route_node *rn;
738
739 /* Sanity Check */
740 if (top == NULL)
741 return NULL;
742
743 for (ALL_LIST_ELEMENTS_RO(top->oiflist, node, oi))
744 for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
745 nbr = rn->info;
746 if (!nbr)
747 continue;
748
749 if (IPV4_ADDR_SAME(&nbr->address.u.prefix4, &addr) ||
750 IPV4_ADDR_SAME(&nbr->router_id, &addr)) {
751 route_unlock_node(rn);
752 return nbr;
753 }
754 }
755 return NULL;
756 }
757
758 /* Get OSPF Path from address */
759 static struct ospf_route *get_nexthop_by_addr(struct ospf *top,
760 struct prefix_ipv4 p)
761 {
762 struct route_node *rn;
763
764 /* Sanity Check */
765 if (top == NULL)
766 return NULL;
767
768 osr_debug(" |- Search Nexthop for prefix %pFX",
769 (struct prefix *)&p);
770
771 rn = route_node_lookup(top->new_table, (struct prefix *)&p);
772
773 /*
774 * Check if we found an OSPF route. May be NULL if SPF has not
775 * yet populate routing table for this prefix.
776 */
777 if (rn == NULL)
778 return NULL;
779
780 route_unlock_node(rn);
781 return rn->info;
782 }
783
784 /* Compute NHLFE entry for Extended Link */
785 static int compute_link_nhlfe(struct sr_link *srl)
786 {
787 struct ospf *top = ospf_lookup_by_vrf_id(VRF_DEFAULT);
788 struct ospf_neighbor *nh;
789 int rc = 0;
790
791 osr_debug(" |- Compute NHLFE for link %pI4", &srl->itf_addr);
792
793 /* First determine the OSPF Neighbor */
794 nh = get_neighbor_by_addr(top, srl->nhlfe[0].nexthop);
795
796 /* Neighbor could be not found when OSPF Adjacency just fire up
797 * because SPF don't yet populate routing table. This NHLFE will
798 * be fixed later when SR SPF schedule will be called.
799 */
800 if (nh == NULL)
801 return rc;
802
803 osr_debug(" |- Found nexthop %pI4", &nh->router_id);
804
805 /* Set ifindex for this neighbor */
806 srl->nhlfe[0].ifindex = nh->oi->ifp->ifindex;
807 srl->nhlfe[1].ifindex = nh->oi->ifp->ifindex;
808
809 /* Update neighbor address for LAN_ADJ_SID */
810 if (srl->type == LAN_ADJ_SID) {
811 IPV4_ADDR_COPY(&srl->nhlfe[0].nexthop, &nh->src);
812 IPV4_ADDR_COPY(&srl->nhlfe[1].nexthop, &nh->src);
813 }
814
815 /* Set Input & Output Label */
816 if (CHECK_FLAG(srl->flags[0], EXT_SUBTLV_LINK_ADJ_SID_VFLG))
817 srl->nhlfe[0].label_in = srl->sid[0];
818 else
819 srl->nhlfe[0].label_in =
820 index2label(srl->sid[0], srl->srn->srgb);
821 if (CHECK_FLAG(srl->flags[1], EXT_SUBTLV_LINK_ADJ_SID_VFLG))
822 srl->nhlfe[1].label_in = srl->sid[1];
823 else
824 srl->nhlfe[1].label_in =
825 index2label(srl->sid[1], srl->srn->srgb);
826
827 srl->nhlfe[0].label_out = MPLS_LABEL_IMPLICIT_NULL;
828 srl->nhlfe[1].label_out = MPLS_LABEL_IMPLICIT_NULL;
829
830 rc = 1;
831 return rc;
832 }
833
834 /**
835 * Compute output label for the given Prefix-SID.
836 *
837 * @param srp Segment Routing Prefix
838 * @param srnext Segment Routing nexthop node
839 *
840 * @return MPLS label or MPLS_INVALID_LABEL in case of error
841 */
842 static mpls_label_t sr_prefix_out_label(const struct sr_prefix *srp,
843 const struct sr_node *srnext)
844 {
845 /* Check if the nexthop SR Node is the last hop? */
846 if (srnext == srp->srn) {
847 /* SR-Node doesn't request NO-PHP. Return Implicit NULL label */
848 if (!CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_NPFLG))
849 return MPLS_LABEL_IMPLICIT_NULL;
850
851 /* SR-Node requests Explicit NULL Label */
852 if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_EFLG))
853 return MPLS_LABEL_IPV4_EXPLICIT_NULL;
854 /* Fallthrough */
855 }
856
857 /* Return SID value as MPLS label if it is an Absolute SID */
858 if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_VFLG
859 | EXT_SUBTLV_PREFIX_SID_LFLG)) {
860 /*
861 * V/L SIDs have local significance, so only adjacent routers
862 * can use them (RFC8665 section #5)
863 */
864 if (srp->srn != srnext)
865 return MPLS_INVALID_LABEL;
866 return srp->sid;
867 }
868
869 /* Return MPLS label as SRGB lower bound + SID index as per RFC 8665 */
870 return (index2label(srp->sid, srnext->srgb));
871 }
872
873 /*
874 * Compute NHLFE entry for Extended Prefix
875 *
876 * @param srp - Segment Routing Prefix
877 *
878 * @return -1 if no route is found, 0 if there is no SR route ready
879 * and 1 if success or update
880 */
881 static int compute_prefix_nhlfe(struct sr_prefix *srp)
882 {
883 struct ospf *top = ospf_lookup_by_vrf_id(VRF_DEFAULT);
884 struct ospf_path *path;
885 struct listnode *node;
886 struct sr_node *srnext;
887 int rc = -1;
888
889 osr_debug(" |- Compute NHLFE for prefix %pFX",
890 (struct prefix *)&srp->prefv4);
891
892
893 /* First determine the nexthop */
894 srp->route = get_nexthop_by_addr(top, srp->prefv4);
895
896 /* Nexthop could be not found when OSPF Adjacency just fire up
897 * because SPF don't yet populate routing table. This NHLFE will
898 * be fixed later when SR SPF schedule will be called.
899 */
900 if (srp->route == NULL)
901 return rc;
902
903 /* Compute Input Label with self SRGB */
904 srp->label_in = index2label(srp->sid, OspfSR.self->srgb);
905
906 rc = 0;
907 for (ALL_LIST_ELEMENTS_RO(srp->route->paths, node, path)) {
908
909 osr_debug(" |- Process new route via %pI4 for this prefix",
910 &path->nexthop);
911
912 /*
913 * Get SR-Node for this nexthop. Could be not yet available
914 * as Extended Link / Prefix and Router Information are flooded
915 * after LSA Type 1 & 2 which populate the OSPF Route Table
916 */
917 srnext = get_sr_node_by_nexthop(top, path->nexthop);
918 if (srnext == NULL)
919 continue;
920
921 /* And store this information for later update */
922 srnext->neighbor = OspfSR.self;
923 path->srni.nexthop = srnext;
924
925 /*
926 * SR Node could be known, but SRGB could be not initialize
927 * This is due to the fact that Extended Link / Prefix could
928 * be received before corresponding Router Information LSA
929 */
930 if (srnext == NULL || srnext->srgb.lower_bound == 0
931 || srnext->srgb.range_size == 0) {
932 osr_debug(
933 " |- SR-Node %pI4 not ready. Stop process",
934 &srnext->adv_router);
935 path->srni.label_out = MPLS_INVALID_LABEL;
936 continue;
937 }
938
939 osr_debug(" |- Found SRGB %u/%u for next hop SR-Node %pI4",
940 srnext->srgb.range_size, srnext->srgb.lower_bound,
941 &srnext->adv_router);
942
943 /* Compute Output Label with Nexthop SR Node SRGB */
944 path->srni.label_out = sr_prefix_out_label(srp, srnext);
945
946 osr_debug(" |- Computed new labels in: %u out: %u",
947 srp->label_in, path->srni.label_out);
948 rc = 1;
949 }
950 return rc;
951 }
952
953 /* Add new NHLFE entry for Adjacency SID */
954 static inline void add_adj_sid(struct sr_nhlfe nhlfe)
955 {
956 if (nhlfe.label_in != 0)
957 ospf_zebra_send_adjacency_sid(ZEBRA_MPLS_LABELS_ADD, nhlfe);
958 }
959
960 /* Remove NHLFE entry for Adjacency SID */
961 static inline void del_adj_sid(struct sr_nhlfe nhlfe)
962 {
963 if (nhlfe.label_in != 0)
964 ospf_zebra_send_adjacency_sid(ZEBRA_MPLS_LABELS_DELETE, nhlfe);
965 }
966
967 /* Update NHLFE entry for Adjacency SID */
968 static inline void update_adj_sid(struct sr_nhlfe n1, struct sr_nhlfe n2)
969 {
970 del_adj_sid(n1);
971 add_adj_sid(n2);
972 }
973
974 /*
975 * Functions to parse and get Extended Link / Prefix
976 * TLVs and SubTLVs
977 */
978
979 /* Extended Link SubTLVs Getter */
980 static struct sr_link *get_ext_link_sid(struct tlv_header *tlvh, size_t size)
981 {
982
983 struct sr_link *srl;
984 struct ext_tlv_link *link = (struct ext_tlv_link *)tlvh;
985 struct ext_subtlv_adj_sid *adj_sid;
986 struct ext_subtlv_lan_adj_sid *lan_sid;
987 struct ext_subtlv_rmt_itf_addr *rmt_itf;
988
989 struct tlv_header *sub_tlvh;
990 uint16_t length = 0, sum = 0, i = 0;
991
992 /* Check TLV size */
993 if ((ntohs(tlvh->length) > size)
994 || ntohs(tlvh->length) < EXT_TLV_LINK_SIZE) {
995 zlog_warn("Wrong Extended Link TLV size. Abort!");
996 return NULL;
997 }
998
999 srl = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_link));
1000
1001 /* Initialize TLV browsing */
1002 length = ntohs(tlvh->length) - EXT_TLV_LINK_SIZE;
1003 sub_tlvh = (struct tlv_header *)((char *)(tlvh) + TLV_HDR_SIZE
1004 + EXT_TLV_LINK_SIZE);
1005 for (; sum < length && sub_tlvh; sub_tlvh = TLV_HDR_NEXT(sub_tlvh)) {
1006 switch (ntohs(sub_tlvh->type)) {
1007 case EXT_SUBTLV_ADJ_SID:
1008 adj_sid = (struct ext_subtlv_adj_sid *)sub_tlvh;
1009 srl->type = ADJ_SID;
1010 i = CHECK_FLAG(adj_sid->flags,
1011 EXT_SUBTLV_LINK_ADJ_SID_BFLG)
1012 ? 1
1013 : 0;
1014 srl->flags[i] = adj_sid->flags;
1015 if (CHECK_FLAG(adj_sid->flags,
1016 EXT_SUBTLV_LINK_ADJ_SID_VFLG))
1017 srl->sid[i] = GET_LABEL(ntohl(adj_sid->value));
1018 else
1019 srl->sid[i] = ntohl(adj_sid->value);
1020 IPV4_ADDR_COPY(&srl->nhlfe[i].nexthop, &link->link_id);
1021 break;
1022 case EXT_SUBTLV_LAN_ADJ_SID:
1023 lan_sid = (struct ext_subtlv_lan_adj_sid *)sub_tlvh;
1024 srl->type = LAN_ADJ_SID;
1025 i = CHECK_FLAG(lan_sid->flags,
1026 EXT_SUBTLV_LINK_ADJ_SID_BFLG)
1027 ? 1
1028 : 0;
1029 srl->flags[i] = lan_sid->flags;
1030 if (CHECK_FLAG(lan_sid->flags,
1031 EXT_SUBTLV_LINK_ADJ_SID_VFLG))
1032 srl->sid[i] = GET_LABEL(ntohl(lan_sid->value));
1033 else
1034 srl->sid[i] = ntohl(lan_sid->value);
1035 IPV4_ADDR_COPY(&srl->nhlfe[i].nexthop,
1036 &lan_sid->neighbor_id);
1037 break;
1038 case EXT_SUBTLV_RMT_ITF_ADDR:
1039 rmt_itf = (struct ext_subtlv_rmt_itf_addr *)sub_tlvh;
1040 IPV4_ADDR_COPY(&srl->nhlfe[0].nexthop, &rmt_itf->value);
1041 IPV4_ADDR_COPY(&srl->nhlfe[1].nexthop, &rmt_itf->value);
1042 break;
1043 default:
1044 break;
1045 }
1046 sum += TLV_SIZE(sub_tlvh);
1047 }
1048
1049 IPV4_ADDR_COPY(&srl->itf_addr, &link->link_data);
1050
1051 osr_debug(" |- Found primary %u and backup %u Adj/Lan Sid for %pI4",
1052 srl->sid[0], srl->sid[1], &srl->itf_addr);
1053
1054 return srl;
1055 }
1056
1057 /* Extended Prefix SubTLVs Getter */
1058 static struct sr_prefix *get_ext_prefix_sid(struct tlv_header *tlvh,
1059 size_t size)
1060 {
1061
1062 struct sr_prefix *srp;
1063 struct ext_tlv_prefix *pref = (struct ext_tlv_prefix *)tlvh;
1064 struct ext_subtlv_prefix_sid *psid;
1065
1066 struct tlv_header *sub_tlvh;
1067 uint16_t length = 0, sum = 0;
1068
1069 /* Check TLV size */
1070 if ((ntohs(tlvh->length) > size)
1071 || ntohs(tlvh->length) < EXT_TLV_PREFIX_SIZE) {
1072 zlog_warn("Wrong Extended Link TLV size. Abort!");
1073 return NULL;
1074 }
1075
1076 srp = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_prefix));
1077
1078 /* Initialize TLV browsing */
1079 length = ntohs(tlvh->length) - EXT_TLV_PREFIX_SIZE;
1080 sub_tlvh = (struct tlv_header *)((char *)(tlvh) + TLV_HDR_SIZE
1081 + EXT_TLV_PREFIX_SIZE);
1082 for (; sum < length && sub_tlvh; sub_tlvh = TLV_HDR_NEXT(sub_tlvh)) {
1083 switch (ntohs(sub_tlvh->type)) {
1084 case EXT_SUBTLV_PREFIX_SID:
1085 psid = (struct ext_subtlv_prefix_sid *)sub_tlvh;
1086 if (psid->algorithm != SR_ALGORITHM_SPF) {
1087 flog_err(EC_OSPF_INVALID_ALGORITHM,
1088 "SR (%s): Unsupported Algorithm",
1089 __func__);
1090 XFREE(MTYPE_OSPF_SR_PARAMS, srp);
1091 return NULL;
1092 }
1093 srp->type = PREF_SID;
1094 srp->flags = psid->flags;
1095 if (CHECK_FLAG(psid->flags, EXT_SUBTLV_PREFIX_SID_VFLG))
1096 srp->sid = GET_LABEL(ntohl(psid->value));
1097 else
1098 srp->sid = ntohl(psid->value);
1099 IPV4_ADDR_COPY(&srp->prefv4.prefix, &pref->address);
1100 srp->prefv4.prefixlen = pref->pref_length;
1101 srp->prefv4.family = AF_INET;
1102 apply_mask_ipv4(&srp->prefv4);
1103 break;
1104 default:
1105 break;
1106 }
1107 sum += TLV_SIZE(sub_tlvh);
1108 }
1109
1110 osr_debug(" |- Found SID %u for prefix %pFX", srp->sid,
1111 (struct prefix *)&srp->prefv4);
1112
1113 return srp;
1114 }
1115
1116 /*
1117 * Functions to manipulate Segment Routing Link & Prefix structures
1118 */
1119
1120 /* Compare two Segment Link: return 0 if equal, 1 otherwise */
1121 static inline int sr_link_cmp(struct sr_link *srl1, struct sr_link *srl2)
1122 {
1123 if ((srl1->sid[0] == srl2->sid[0]) && (srl1->sid[1] == srl2->sid[1])
1124 && (srl1->type == srl2->type) && (srl1->flags[0] == srl2->flags[0])
1125 && (srl1->flags[1] == srl2->flags[1]))
1126 return 0;
1127 else
1128 return 1;
1129 }
1130
1131 /* Compare two Segment Prefix: return 0 if equal, 1 otherwise */
1132 static inline int sr_prefix_cmp(struct sr_prefix *srp1, struct sr_prefix *srp2)
1133 {
1134 if ((srp1->sid == srp2->sid) && (srp1->flags == srp2->flags))
1135 return 0;
1136 else
1137 return 1;
1138 }
1139
1140 /* Update Segment Link of given Segment Routing Node */
1141 static void update_ext_link_sid(struct sr_node *srn, struct sr_link *srl,
1142 uint8_t lsa_flags)
1143 {
1144 struct listnode *node;
1145 struct sr_link *lk;
1146 bool found = false;
1147 bool config = true;
1148
1149 /* Sanity check */
1150 if ((srn == NULL) || (srl == NULL))
1151 return;
1152
1153 osr_debug(" |- Process Extended Link Adj/Lan-SID");
1154
1155 /* Detect if Adj/Lan_Adj SID must be configured */
1156 if (!CHECK_FLAG(lsa_flags, OSPF_LSA_SELF)
1157 && (CHECK_FLAG(srl->flags[0], EXT_SUBTLV_LINK_ADJ_SID_LFLG)
1158 || CHECK_FLAG(srl->flags[1], EXT_SUBTLV_LINK_ADJ_SID_LFLG)))
1159 config = false;
1160
1161 /* Search for existing Segment Link */
1162 for (ALL_LIST_ELEMENTS_RO(srn->ext_link, node, lk))
1163 if (lk->instance == srl->instance) {
1164 found = true;
1165 break;
1166 }
1167
1168 osr_debug(" |- %s SR Link 8.0.0.%u for SR node %pI4",
1169 found ? "Update" : "Add", GET_OPAQUE_ID(srl->instance),
1170 &srn->adv_router);
1171
1172 /* if not found, add new Segment Link and install NHLFE */
1173 if (!found) {
1174 /* Complete SR-Link and add it to SR-Node list */
1175 srl->srn = srn;
1176 IPV4_ADDR_COPY(&srl->adv_router, &srn->adv_router);
1177 listnode_add(srn->ext_link, srl);
1178 /* Try to set MPLS table */
1179 if (config && compute_link_nhlfe(srl)) {
1180 add_adj_sid(srl->nhlfe[0]);
1181 add_adj_sid(srl->nhlfe[1]);
1182 }
1183 } else {
1184 /* Update SR-Link if they are different */
1185 if (sr_link_cmp(lk, srl)) {
1186 /* Try to set MPLS table */
1187 if (config) {
1188 if (compute_link_nhlfe(srl)) {
1189 update_adj_sid(lk->nhlfe[0],
1190 srl->nhlfe[0]);
1191 update_adj_sid(lk->nhlfe[1],
1192 srl->nhlfe[1]);
1193 } else {
1194 del_adj_sid(lk->nhlfe[0]);
1195 del_adj_sid(lk->nhlfe[1]);
1196 }
1197 }
1198 /* Replace SR-Link in SR-Node Adjacency List */
1199 listnode_delete(srn->ext_link, lk);
1200 XFREE(MTYPE_OSPF_SR_PARAMS, lk);
1201 srl->srn = srn;
1202 IPV4_ADDR_COPY(&srl->adv_router, &srn->adv_router);
1203 listnode_add(srn->ext_link, srl);
1204 } else {
1205 /*
1206 * This is just an LSA refresh.
1207 * Stop processing and free SR Link
1208 */
1209 XFREE(MTYPE_OSPF_SR_PARAMS, srl);
1210 }
1211 }
1212 }
1213
1214 /* Update Segment Prefix of given Segment Routing Node */
1215 static void update_ext_prefix_sid(struct sr_node *srn, struct sr_prefix *srp)
1216 {
1217
1218 struct listnode *node;
1219 struct sr_prefix *pref;
1220 bool found = false;
1221
1222 /* Sanity check */
1223 if (srn == NULL || srp == NULL)
1224 return;
1225
1226 osr_debug(" |- Process Extended Prefix SID %u", srp->sid);
1227
1228 /* Process only Global Prefix SID */
1229 if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_LFLG))
1230 return;
1231
1232 /* Search for existing Segment Prefix */
1233 for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, pref))
1234 if (pref->instance == srp->instance
1235 && prefix_same((struct prefix *)&srp->prefv4,
1236 &pref->prefv4)) {
1237 found = true;
1238 break;
1239 }
1240
1241 osr_debug(" |- %s SR LSA ID 7.0.0.%u for SR node %pI4",
1242 found ? "Update" : "Add", GET_OPAQUE_ID(srp->instance),
1243 &srn->adv_router);
1244
1245 /* Complete SR-Prefix */
1246 srp->srn = srn;
1247 IPV4_ADDR_COPY(&srp->adv_router, &srn->adv_router);
1248
1249 /* if not found, add new Segment Prefix and install NHLFE */
1250 if (!found) {
1251 /* Add it to SR-Node list ... */
1252 listnode_add(srn->ext_prefix, srp);
1253 /* ... and try to set MPLS table */
1254 if (compute_prefix_nhlfe(srp) == 1)
1255 ospf_zebra_update_prefix_sid(srp);
1256 } else {
1257 /*
1258 * An old SR prefix exist. Check if something changes or if it
1259 * is just a refresh.
1260 */
1261 if (sr_prefix_cmp(pref, srp)) {
1262 if (compute_prefix_nhlfe(srp) == 1) {
1263 ospf_zebra_delete_prefix_sid(pref);
1264 /* Replace Segment Prefix */
1265 listnode_delete(srn->ext_prefix, pref);
1266 XFREE(MTYPE_OSPF_SR_PARAMS, pref);
1267 listnode_add(srn->ext_prefix, srp);
1268 ospf_zebra_update_prefix_sid(srp);
1269 } else {
1270 /* New NHLFE was not found.
1271 * Just free the SR Prefix
1272 */
1273 XFREE(MTYPE_OSPF_SR_PARAMS, srp);
1274 }
1275 } else {
1276 /* This is just an LSA refresh.
1277 * Stop processing and free SR Prefix
1278 */
1279 XFREE(MTYPE_OSPF_SR_PARAMS, srp);
1280 }
1281 }
1282 }
1283
1284 /*
1285 * When change the FRR Self SRGB, update the NHLFE Input Label
1286 * for all Extended Prefix with SID index through hash_iterate()
1287 */
1288 static void update_in_nhlfe(struct hash_bucket *bucket, void *args)
1289 {
1290 struct listnode *node;
1291 struct sr_node *srn = (struct sr_node *)bucket->data;
1292 struct sr_prefix *srp;
1293
1294 /* Process Every Extended Prefix for this SR-Node */
1295 for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp)) {
1296 /* Process Self SRN only if NO-PHP is requested */
1297 if ((srn == OspfSR.self)
1298 && !CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_NPFLG))
1299 continue;
1300
1301 /* Process only SID Index */
1302 if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_VFLG))
1303 continue;
1304
1305 /* First, remove old MPLS table entries ... */
1306 ospf_zebra_delete_prefix_sid(srp);
1307 /* ... then compute new input label ... */
1308 srp->label_in = index2label(srp->sid, OspfSR.self->srgb);
1309 /* ... and install new MPLS LFIB */
1310 ospf_zebra_update_prefix_sid(srp);
1311 }
1312 }
1313
1314 /*
1315 * When SRGB has changed, update NHLFE Output Label for all Extended Prefix
1316 * with SID index which use the given SR-Node as nexthop through hash_iterate()
1317 */
1318 static void update_out_nhlfe(struct hash_bucket *bucket, void *args)
1319 {
1320 struct listnode *node, *pnode;
1321 struct sr_node *srn = (struct sr_node *)bucket->data;
1322 struct sr_node *srnext = (struct sr_node *)args;
1323 struct sr_prefix *srp;
1324 struct ospf_path *path;
1325
1326 /* Skip Self SR-Node */
1327 if (srn == OspfSR.self)
1328 return;
1329
1330 osr_debug("SR (%s): Update Out NHLFE for neighbor SR-Node %pI4",
1331 __func__, &srn->adv_router);
1332
1333 for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp)) {
1334 /* Skip Prefix that has not yet a valid route */
1335 if (srp->route == NULL)
1336 continue;
1337
1338 for (ALL_LIST_ELEMENTS_RO(srp->route->paths, pnode, path)) {
1339 /* Skip path that has not next SR-Node as nexthop */
1340 if (path->srni.nexthop != srnext)
1341 continue;
1342
1343 /* Compute new Output Label */
1344 path->srni.label_out = sr_prefix_out_label(srp, srnext);
1345 }
1346
1347 /* Finally update MPLS table */
1348 ospf_zebra_update_prefix_sid(srp);
1349 }
1350 }
1351
1352 /*
1353 * Following functions are call when new Segment Routing LSA are received
1354 * - Router Information: ospf_sr_ri_lsa_update() & ospf_sr_ri_lsa_delete()
1355 * - Extended Link: ospf_sr_ext_link_update() & ospf_sr_ext_link_delete()
1356 * - Extended Prefix: ospf_ext_prefix_update() & ospf_sr_ext_prefix_delete()
1357 */
1358
1359 /* Update Segment Routing from Router Information LSA */
1360 void ospf_sr_ri_lsa_update(struct ospf_lsa *lsa)
1361 {
1362 struct sr_node *srn;
1363 struct tlv_header *tlvh;
1364 struct lsa_header *lsah = lsa->data;
1365 struct ri_sr_tlv_sid_label_range *ri_srgb = NULL;
1366 struct ri_sr_tlv_sid_label_range *ri_srlb = NULL;
1367 struct ri_sr_tlv_sr_algorithm *algo = NULL;
1368 struct sr_block srgb;
1369 uint16_t length = 0, sum = 0;
1370 uint8_t msd = 0;
1371
1372 osr_debug("SR (%s): Process Router Information LSA 4.0.0.%u from %pI4",
1373 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1374 &lsah->adv_router);
1375
1376 /* Sanity check */
1377 if (IS_LSA_SELF(lsa))
1378 return;
1379
1380 if (OspfSR.neighbors == NULL) {
1381 flog_err(EC_OSPF_SR_INVALID_DB,
1382 "SR (%s): Abort! no valid SR DataBase", __func__);
1383 return;
1384 }
1385
1386 /* Search SR Node in hash table from Router ID */
1387 srn = (struct sr_node *)hash_lookup(OspfSR.neighbors,
1388 &lsah->adv_router);
1389
1390
1391 /* Collect Router Information Sub TLVs */
1392 /* Initialize TLV browsing */
1393 length = lsa->size - OSPF_LSA_HEADER_SIZE;
1394 srgb.range_size = 0;
1395 srgb.lower_bound = 0;
1396
1397 for (tlvh = TLV_HDR_TOP(lsah); (sum < length) && (tlvh != NULL);
1398 tlvh = TLV_HDR_NEXT(tlvh)) {
1399 switch (ntohs(tlvh->type)) {
1400 case RI_SR_TLV_SR_ALGORITHM:
1401 algo = (struct ri_sr_tlv_sr_algorithm *)tlvh;
1402 break;
1403 case RI_SR_TLV_SRGB_LABEL_RANGE:
1404 ri_srgb = (struct ri_sr_tlv_sid_label_range *)tlvh;
1405 break;
1406 case RI_SR_TLV_SRLB_LABEL_RANGE:
1407 ri_srlb = (struct ri_sr_tlv_sid_label_range *)tlvh;
1408 break;
1409 case RI_SR_TLV_NODE_MSD:
1410 msd = ((struct ri_sr_tlv_node_msd *)(tlvh))->value;
1411 break;
1412 default:
1413 break;
1414 }
1415 sum += TLV_SIZE(tlvh);
1416 }
1417
1418 /* Check if Segment Routing Capabilities has been found */
1419 if (ri_srgb == NULL) {
1420 /* Skip Router Information without SR capabilities
1421 * advertise by a non SR Node */
1422 if (srn == NULL) {
1423 return;
1424 } else {
1425 /* Remove SR Node that advertise Router Information
1426 * without SR capabilities. This could correspond to a
1427 * Node stopping Segment Routing */
1428 hash_release(OspfSR.neighbors, &(srn->adv_router));
1429 sr_node_del(srn);
1430 return;
1431 }
1432 }
1433
1434 /* Check that RI LSA belongs to the correct SR Node */
1435 if ((srn != NULL) && (srn->instance != 0)
1436 && (srn->instance != ntohl(lsah->id.s_addr))) {
1437 flog_err(EC_OSPF_SR_INVALID_LSA_ID,
1438 "SR (%s): Abort! Wrong LSA ID 4.0.0.%u for SR node %pI4/%u",
1439 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1440 &lsah->adv_router, srn->instance);
1441 return;
1442 }
1443
1444 /* OK. All things look good. Get SRGB */
1445 srgb.range_size = GET_RANGE_SIZE(ntohl(ri_srgb->size));
1446 srgb.lower_bound = GET_LABEL(ntohl(ri_srgb->lower.value));
1447
1448 /* Check if it is a new SR Node or not */
1449 if (srn == NULL) {
1450 /* Get a new SR Node in hash table from Router ID */
1451 srn = (struct sr_node *)hash_get(OspfSR.neighbors,
1452 &lsah->adv_router,
1453 (void *)sr_node_new);
1454 /* update LSA ID */
1455 srn->instance = ntohl(lsah->id.s_addr);
1456 /* Copy SRGB */
1457 srn->srgb.range_size = srgb.range_size;
1458 srn->srgb.lower_bound = srgb.lower_bound;
1459 }
1460
1461 /* Update Algorithm, SRLB and MSD if present */
1462 if (algo != NULL) {
1463 int i;
1464 for (i = 0; i < ntohs(algo->header.length); i++)
1465 srn->algo[i] = algo->value[0];
1466 for (; i < ALGORITHM_COUNT; i++)
1467 srn->algo[i] = SR_ALGORITHM_UNSET;
1468 } else {
1469 srn->algo[0] = SR_ALGORITHM_SPF;
1470 }
1471 srn->msd = msd;
1472 if (ri_srlb != NULL) {
1473 srn->srlb.range_size = GET_RANGE_SIZE(ntohl(ri_srlb->size));
1474 srn->srlb.lower_bound = GET_LABEL(ntohl(ri_srlb->lower.value));
1475 }
1476
1477 /* Check if SRGB has changed */
1478 if ((srn->srgb.range_size == srgb.range_size)
1479 && (srn->srgb.lower_bound == srgb.lower_bound))
1480 return;
1481
1482 /* Copy SRGB */
1483 srn->srgb.range_size = srgb.range_size;
1484 srn->srgb.lower_bound = srgb.lower_bound;
1485
1486 osr_debug(" |- Update SR-Node[%pI4], SRGB[%u/%u], SRLB[%u/%u], Algo[%u], MSD[%u]",
1487 &srn->adv_router, srn->srgb.lower_bound, srn->srgb.range_size,
1488 srn->srlb.lower_bound, srn->srlb.range_size, srn->algo[0],
1489 srn->msd);
1490
1491 /* ... and NHLFE if it is a neighbor SR node */
1492 if (srn->neighbor == OspfSR.self)
1493 hash_iterate(OspfSR.neighbors, update_out_nhlfe, srn);
1494 }
1495
1496 /*
1497 * Delete SR Node entry in hash table information corresponding to an expired
1498 * Router Information LSA
1499 */
1500 void ospf_sr_ri_lsa_delete(struct ospf_lsa *lsa)
1501 {
1502 struct sr_node *srn;
1503 struct lsa_header *lsah = lsa->data;
1504
1505 osr_debug("SR (%s): Remove SR node %pI4 from lsa_id 4.0.0.%u", __func__,
1506 &lsah->adv_router, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)));
1507
1508 /* Sanity check */
1509 if (OspfSR.neighbors == NULL) {
1510 flog_err(EC_OSPF_SR_INVALID_DB,
1511 "SR (%s): Abort! no valid SR Data Base", __func__);
1512 return;
1513 }
1514
1515 /* Release Router ID entry in SRDB hash table */
1516 srn = hash_release(OspfSR.neighbors, &(lsah->adv_router));
1517
1518 /* Sanity check */
1519 if (srn == NULL) {
1520 flog_err(EC_OSPF_SR_NODE_CREATE,
1521 "SR (%s): Abort! no entry in SRDB for SR Node %pI4",
1522 __func__, &lsah->adv_router);
1523 return;
1524 }
1525
1526 if ((srn->instance != 0) && (srn->instance != ntohl(lsah->id.s_addr))) {
1527 flog_err(
1528 EC_OSPF_SR_INVALID_LSA_ID,
1529 "SR (%s): Abort! Wrong LSA ID 4.0.0.%u for SR node %pI4",
1530 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1531 &lsah->adv_router);
1532 return;
1533 }
1534
1535 /* Remove SR node */
1536 sr_node_del(srn);
1537 }
1538
1539 /* Update Segment Routing from Extended Link LSA */
1540 void ospf_sr_ext_link_lsa_update(struct ospf_lsa *lsa)
1541 {
1542 struct sr_node *srn;
1543 struct tlv_header *tlvh;
1544 struct lsa_header *lsah = lsa->data;
1545 struct sr_link *srl;
1546
1547 int length;
1548
1549 osr_debug("SR (%s): Process Extended Link LSA 8.0.0.%u from %pI4",
1550 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1551 &lsah->adv_router);
1552
1553 /* Sanity check */
1554 if (OspfSR.neighbors == NULL) {
1555 flog_err(EC_OSPF_SR_INVALID_DB,
1556 "SR (%s): Abort! no valid SR DataBase", __func__);
1557 return;
1558 }
1559
1560 /* Get SR Node in hash table from Router ID */
1561 srn = (struct sr_node *)hash_get(OspfSR.neighbors,
1562 (void *)&(lsah->adv_router),
1563 (void *)sr_node_new);
1564
1565 /* Initialize TLV browsing */
1566 length = lsa->size - OSPF_LSA_HEADER_SIZE;
1567 for (tlvh = TLV_HDR_TOP(lsah); length > 0 && tlvh;
1568 tlvh = TLV_HDR_NEXT(tlvh)) {
1569 if (ntohs(tlvh->type) == EXT_TLV_LINK) {
1570 /* Got Extended Link information */
1571 srl = get_ext_link_sid(tlvh, length);
1572 /* Update SID if not null */
1573 if (srl != NULL) {
1574 srl->instance = ntohl(lsah->id.s_addr);
1575 update_ext_link_sid(srn, srl, lsa->flags);
1576 }
1577 }
1578 length -= TLV_SIZE(tlvh);
1579 }
1580 }
1581
1582 /* Delete Segment Routing from Extended Link LSA */
1583 void ospf_sr_ext_link_lsa_delete(struct ospf_lsa *lsa)
1584 {
1585 struct listnode *node;
1586 struct sr_link *srl;
1587 struct sr_node *srn;
1588 struct lsa_header *lsah = lsa->data;
1589 uint32_t instance = ntohl(lsah->id.s_addr);
1590
1591 osr_debug("SR (%s): Remove Extended Link LSA 8.0.0.%u from %pI4",
1592 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1593 &lsah->adv_router);
1594
1595 /* Sanity check */
1596 if (OspfSR.neighbors == NULL) {
1597 flog_err(EC_OSPF_SR_INVALID_DB,
1598 "SR (%s): Abort! no valid SR DataBase", __func__);
1599 return;
1600 }
1601
1602 /* Search SR Node in hash table from Router ID */
1603 srn = (struct sr_node *)hash_lookup(OspfSR.neighbors,
1604 (void *)&(lsah->adv_router));
1605
1606 /*
1607 * SR-Node may be NULL if it has been remove previously when
1608 * processing Router Information LSA deletion
1609 */
1610 if (srn == NULL) {
1611 flog_err(EC_OSPF_SR_INVALID_DB,
1612 "SR (%s): Stop! no entry in SRDB for SR Node %pI4",
1613 __func__, &lsah->adv_router);
1614 return;
1615 }
1616
1617 /* Search for corresponding Segment Link */
1618 for (ALL_LIST_ELEMENTS_RO(srn->ext_link, node, srl))
1619 if (srl->instance == instance)
1620 break;
1621
1622 /* Remove Segment Link if found. Note that for Neighbors, only Global
1623 * Adj/Lan-Adj SID are stored in the SR-DB */
1624 if ((srl != NULL) && (srl->instance == instance)) {
1625 del_adj_sid(srl->nhlfe[0]);
1626 del_adj_sid(srl->nhlfe[1]);
1627 listnode_delete(srn->ext_link, srl);
1628 XFREE(MTYPE_OSPF_SR_PARAMS, srl);
1629 }
1630 }
1631
1632 /* Add (LAN)Adjacency-SID from Extended Link Information */
1633 void ospf_sr_ext_itf_add(struct ext_itf *exti)
1634 {
1635 struct sr_node *srn = OspfSR.self;
1636 struct sr_link *srl;
1637
1638 osr_debug("SR (%s): Add Extended Link LSA 8.0.0.%u from self", __func__,
1639 exti->instance);
1640
1641 /* Sanity check */
1642 if (srn == NULL)
1643 return;
1644
1645 /* Initialize new Segment Routing Link */
1646 srl = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_link));
1647 srl->srn = srn;
1648 srl->adv_router = srn->adv_router;
1649 srl->itf_addr = exti->link.link_data;
1650 srl->instance =
1651 SET_OPAQUE_LSID(OPAQUE_TYPE_EXTENDED_LINK_LSA, exti->instance);
1652 srl->remote_id = exti->link.link_id;
1653 switch (exti->stype) {
1654 case ADJ_SID:
1655 srl->type = ADJ_SID;
1656 /* Primary information */
1657 srl->flags[0] = exti->adj_sid[0].flags;
1658 if (CHECK_FLAG(exti->adj_sid[0].flags,
1659 EXT_SUBTLV_LINK_ADJ_SID_VFLG))
1660 srl->sid[0] = GET_LABEL(ntohl(exti->adj_sid[0].value));
1661 else
1662 srl->sid[0] = ntohl(exti->adj_sid[0].value);
1663 if (exti->rmt_itf_addr.header.type == 0)
1664 srl->nhlfe[0].nexthop = exti->link.link_id;
1665 else
1666 srl->nhlfe[0].nexthop = exti->rmt_itf_addr.value;
1667 /* Backup Information if set */
1668 if (exti->adj_sid[1].header.type == 0)
1669 break;
1670 srl->flags[1] = exti->adj_sid[1].flags;
1671 if (CHECK_FLAG(exti->adj_sid[1].flags,
1672 EXT_SUBTLV_LINK_ADJ_SID_VFLG))
1673 srl->sid[1] = GET_LABEL(ntohl(exti->adj_sid[1].value));
1674 else
1675 srl->sid[1] = ntohl(exti->adj_sid[1].value);
1676 if (exti->rmt_itf_addr.header.type == 0)
1677 srl->nhlfe[1].nexthop = exti->link.link_id;
1678 else
1679 srl->nhlfe[1].nexthop = exti->rmt_itf_addr.value;
1680 break;
1681 case LAN_ADJ_SID:
1682 srl->type = LAN_ADJ_SID;
1683 /* Primary information */
1684 srl->flags[0] = exti->lan_sid[0].flags;
1685 if (CHECK_FLAG(exti->lan_sid[0].flags,
1686 EXT_SUBTLV_LINK_ADJ_SID_VFLG))
1687 srl->sid[0] = GET_LABEL(ntohl(exti->lan_sid[0].value));
1688 else
1689 srl->sid[0] = ntohl(exti->lan_sid[0].value);
1690 if (exti->rmt_itf_addr.header.type == 0)
1691 srl->nhlfe[0].nexthop = exti->lan_sid[0].neighbor_id;
1692 else
1693 srl->nhlfe[0].nexthop = exti->rmt_itf_addr.value;
1694 /* Backup Information if set */
1695 if (exti->lan_sid[1].header.type == 0)
1696 break;
1697 srl->flags[1] = exti->lan_sid[1].flags;
1698 if (CHECK_FLAG(exti->lan_sid[1].flags,
1699 EXT_SUBTLV_LINK_ADJ_SID_VFLG))
1700 srl->sid[1] = GET_LABEL(ntohl(exti->lan_sid[1].value));
1701 else
1702 srl->sid[1] = ntohl(exti->lan_sid[1].value);
1703 if (exti->rmt_itf_addr.header.type == 0)
1704 srl->nhlfe[1].nexthop = exti->lan_sid[1].neighbor_id;
1705 else
1706 srl->nhlfe[1].nexthop = exti->rmt_itf_addr.value;
1707 break;
1708 case PREF_SID:
1709 case LOCAL_SID:
1710 /* Wrong SID Type. Abort! */
1711 XFREE(MTYPE_OSPF_SR_PARAMS, srl);
1712 return;
1713 }
1714
1715 /* Segment Routing Link is ready, update it */
1716 update_ext_link_sid(srn, srl, OSPF_LSA_SELF);
1717 }
1718
1719 /* Delete Prefix or (LAN)Adjacency-SID from Extended Link Information */
1720 void ospf_sr_ext_itf_delete(struct ext_itf *exti)
1721 {
1722 struct listnode *node;
1723 struct sr_node *srn = OspfSR.self;
1724 struct sr_prefix *srp = NULL;
1725 struct sr_link *srl = NULL;
1726 uint32_t instance;
1727
1728 osr_debug("SR (%s): Remove Extended LSA %u.0.0.%u from self",
1729 __func__, exti->stype == PREF_SID ? 7 : 8, exti->instance);
1730
1731 /* Sanity check: SR-Node and Extended Prefix/Link list may have been
1732 * removed earlier when stopping OSPF or OSPF-SR */
1733 if (srn == NULL || srn->ext_prefix == NULL || srn->ext_link == NULL)
1734 return;
1735
1736 if (exti->stype == PREF_SID) {
1737 instance = SET_OPAQUE_LSID(OPAQUE_TYPE_EXTENDED_PREFIX_LSA,
1738 exti->instance);
1739 for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp))
1740 if (srp->instance == instance)
1741 break;
1742
1743 /* Uninstall Segment Prefix SID if found */
1744 if ((srp != NULL) && (srp->instance == instance))
1745 ospf_zebra_delete_prefix_sid(srp);
1746 } else {
1747 /* Search for corresponding Segment Link for self SR-Node */
1748 instance = SET_OPAQUE_LSID(OPAQUE_TYPE_EXTENDED_LINK_LSA,
1749 exti->instance);
1750 for (ALL_LIST_ELEMENTS_RO(srn->ext_link, node, srl))
1751 if (srl->instance == instance)
1752 break;
1753
1754 /* Remove Segment Link if found */
1755 if ((srl != NULL) && (srl->instance == instance)) {
1756 del_adj_sid(srl->nhlfe[0]);
1757 del_adj_sid(srl->nhlfe[1]);
1758 listnode_delete(srn->ext_link, srl);
1759 XFREE(MTYPE_OSPF_SR_PARAMS, srl);
1760 }
1761 }
1762 }
1763
1764 /* Update Segment Routing from Extended Prefix LSA */
1765 void ospf_sr_ext_prefix_lsa_update(struct ospf_lsa *lsa)
1766 {
1767 struct sr_node *srn;
1768 struct tlv_header *tlvh;
1769 struct lsa_header *lsah = (struct lsa_header *)lsa->data;
1770 struct sr_prefix *srp;
1771
1772 int length;
1773
1774 osr_debug("SR (%s): Process Extended Prefix LSA 7.0.0.%u from %pI4",
1775 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1776 &lsah->adv_router);
1777
1778 /* Sanity check */
1779 if (OspfSR.neighbors == NULL) {
1780 flog_err(EC_OSPF_SR_INVALID_DB,
1781 "SR (%s): Abort! no valid SR DataBase", __func__);
1782 return;
1783 }
1784
1785 /* Get SR Node in hash table from Router ID */
1786 srn = (struct sr_node *)hash_get(OspfSR.neighbors,
1787 (void *)&(lsah->adv_router),
1788 (void *)sr_node_new);
1789 /* Initialize TLV browsing */
1790 length = lsa->size - OSPF_LSA_HEADER_SIZE;
1791 for (tlvh = TLV_HDR_TOP(lsah); length > 0 && tlvh;
1792 tlvh = TLV_HDR_NEXT(tlvh)) {
1793 if (ntohs(tlvh->type) == EXT_TLV_LINK) {
1794 /* Got Extended Link information */
1795 srp = get_ext_prefix_sid(tlvh, length);
1796 /* Update SID if not null */
1797 if (srp != NULL) {
1798 srp->instance = ntohl(lsah->id.s_addr);
1799 update_ext_prefix_sid(srn, srp);
1800 }
1801 }
1802 length -= TLV_SIZE(tlvh);
1803 }
1804 }
1805
1806 /* Delete Segment Routing from Extended Prefix LSA */
1807 void ospf_sr_ext_prefix_lsa_delete(struct ospf_lsa *lsa)
1808 {
1809 struct listnode *node;
1810 struct sr_prefix *srp;
1811 struct sr_node *srn;
1812 struct lsa_header *lsah = (struct lsa_header *)lsa->data;
1813 uint32_t instance = ntohl(lsah->id.s_addr);
1814
1815 osr_debug("SR (%s): Remove Extended Prefix LSA 7.0.0.%u from %pI4",
1816 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1817 &lsah->adv_router);
1818
1819 /* Sanity check */
1820 if (OspfSR.neighbors == NULL) {
1821 flog_err(EC_OSPF_SR_INVALID_DB,
1822 "SR (%s): Abort! no valid SR DataBase", __func__);
1823 return;
1824 }
1825
1826 /* Search SR Node in hash table from Router ID */
1827 srn = (struct sr_node *)hash_lookup(OspfSR.neighbors,
1828 (void *)&(lsah->adv_router));
1829
1830 /*
1831 * SR-Node may be NULL if it has been remove previously when
1832 * processing Router Information LSA deletion
1833 */
1834 if (srn == NULL) {
1835 flog_err(EC_OSPF_SR_INVALID_DB,
1836 "SR (%s): Stop! no entry in SRDB for SR Node %pI4",
1837 __func__, &lsah->adv_router);
1838 return;
1839 }
1840
1841 /* Search for corresponding Segment Prefix */
1842 for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp))
1843 if (srp->instance == instance)
1844 break;
1845
1846 /* Remove Prefix if found */
1847 if ((srp != NULL) && (srp->instance == instance)) {
1848 ospf_zebra_delete_prefix_sid(srp);
1849 listnode_delete(srn->ext_prefix, srp);
1850 XFREE(MTYPE_OSPF_SR_PARAMS, srp);
1851 } else {
1852 flog_err(
1853 EC_OSPF_SR_INVALID_DB,
1854 "SR (%s): Didn't found corresponding SR Prefix 7.0.0.%u for SR Node %pI4",
1855 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1856 &lsah->adv_router);
1857 }
1858 }
1859
1860 /*
1861 * Update Prefix SID. Call by ospf_ext_pref_ism_change to
1862 * complete initial CLI command at startup.
1863 *
1864 * @param ifp - Loopback interface
1865 * @param pref - Prefix address of this interface
1866 *
1867 * @return - void
1868 */
1869 void ospf_sr_update_local_prefix(struct interface *ifp, struct prefix *p)
1870 {
1871 struct listnode *node;
1872 struct sr_prefix *srp;
1873
1874 /* Sanity Check */
1875 if ((ifp == NULL) || (p == NULL))
1876 return;
1877
1878 /*
1879 * Search if there is a Segment Prefix that correspond to this
1880 * interface or prefix, and update it if found
1881 */
1882 for (ALL_LIST_ELEMENTS_RO(OspfSR.self->ext_prefix, node, srp)) {
1883 if ((srp->nhlfe.ifindex == ifp->ifindex)
1884 || ((IPV4_ADDR_SAME(&srp->prefv4.prefix, &p->u.prefix4))
1885 && (srp->prefv4.prefixlen == p->prefixlen))) {
1886
1887 /* Update Interface & Prefix info */
1888 srp->nhlfe.ifindex = ifp->ifindex;
1889 IPV4_ADDR_COPY(&srp->prefv4.prefix, &p->u.prefix4);
1890 srp->prefv4.prefixlen = p->prefixlen;
1891 srp->prefv4.family = p->family;
1892 IPV4_ADDR_COPY(&srp->nhlfe.nexthop, &p->u.prefix4);
1893
1894 /* OK. Let's Schedule Extended Prefix LSA */
1895 srp->instance = ospf_ext_schedule_prefix_index(
1896 ifp, srp->sid, &srp->prefv4, srp->flags);
1897
1898 osr_debug(
1899 " |- Update Node SID %pFX - %u for self SR Node",
1900 (struct prefix *)&srp->prefv4, srp->sid);
1901
1902 /* Install SID if NO-PHP is set and not EXPLICIT-NULL */
1903 if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_NPFLG)
1904 && !CHECK_FLAG(srp->flags,
1905 EXT_SUBTLV_PREFIX_SID_EFLG)) {
1906 srp->label_in = index2label(srp->sid,
1907 OspfSR.self->srgb);
1908 srp->nhlfe.label_out = MPLS_LABEL_IMPLICIT_NULL;
1909 ospf_zebra_update_prefix_sid(srp);
1910 }
1911 }
1912 }
1913 }
1914
1915 /*
1916 * Following functions are used to update MPLS LFIB after a SPF run
1917 */
1918
1919 static void ospf_sr_nhlfe_update(struct hash_bucket *bucket, void *args)
1920 {
1921
1922 struct sr_node *srn = (struct sr_node *)bucket->data;
1923 struct listnode *node;
1924 struct sr_prefix *srp;
1925 bool old;
1926 int rc;
1927
1928 osr_debug(" |- Update Prefix for SR Node %pI4", &srn->adv_router);
1929
1930 /* Skip Self SR Node */
1931 if (srn == OspfSR.self)
1932 return;
1933
1934 /* Update Extended Prefix */
1935 for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp)) {
1936
1937 /* Keep track of valid route */
1938 old = srp->route != NULL;
1939
1940 /* Compute the new NHLFE */
1941 rc = compute_prefix_nhlfe(srp);
1942
1943 /* Check computation result */
1944 switch (rc) {
1945 /* Routes are not know, remove old NHLFE if any to avoid loop */
1946 case -1:
1947 if (old)
1948 ospf_zebra_delete_prefix_sid(srp);
1949 break;
1950 /* Routes exist but are not ready, skip it */
1951 case 0:
1952 break;
1953 /* There is at least one route, update NHLFE */
1954 case 1:
1955 ospf_zebra_update_prefix_sid(srp);
1956 break;
1957 default:
1958 break;
1959 }
1960 }
1961 }
1962
1963 void ospf_sr_update_task(struct ospf *ospf)
1964 {
1965
1966 struct timeval start_time, stop_time;
1967
1968 /* Check ospf and SR status */
1969 if ((ospf == NULL) || (OspfSR.status != SR_UP))
1970 return;
1971
1972 monotime(&start_time);
1973
1974 osr_debug("SR (%s): Start SPF update", __func__);
1975
1976 hash_iterate(OspfSR.neighbors, (void (*)(struct hash_bucket *,
1977 void *))ospf_sr_nhlfe_update,
1978 NULL);
1979
1980 monotime(&stop_time);
1981
1982 osr_debug("SR (%s): SPF Processing Time(usecs): %lld", __func__,
1983 (stop_time.tv_sec - start_time.tv_sec) * 1000000LL
1984 + (stop_time.tv_usec - start_time.tv_usec));
1985 }
1986
1987 /*
1988 * --------------------------------------
1989 * Following are vty command functions.
1990 * --------------------------------------
1991 */
1992
1993 /*
1994 * Segment Routing Router configuration
1995 *
1996 * Must be centralize as it concerns both Extended Link/Prefix LSA
1997 * and Router Information LSA. Choose to call it from Extended Prefix
1998 * write_config() call back.
1999 *
2000 * @param vty VTY output
2001 *
2002 * @return none
2003 */
2004 void ospf_sr_config_write_router(struct vty *vty)
2005 {
2006 struct listnode *node;
2007 struct sr_prefix *srp;
2008 uint32_t upper;
2009
2010 if (OspfSR.status == SR_UP)
2011 vty_out(vty, " segment-routing on\n");
2012
2013 upper = OspfSR.srgb.start + OspfSR.srgb.size - 1;
2014 if ((OspfSR.srgb.start != DEFAULT_SRGB_LABEL)
2015 || (OspfSR.srgb.size != DEFAULT_SRGB_SIZE))
2016 vty_out(vty, " segment-routing global-block %u %u",
2017 OspfSR.srgb.start, upper);
2018
2019 if ((OspfSR.srlb.start != DEFAULT_SRLB_LABEL) ||
2020 (OspfSR.srlb.end != DEFAULT_SRLB_END)) {
2021 if ((OspfSR.srgb.start == DEFAULT_SRGB_LABEL) &&
2022 (OspfSR.srgb.size == DEFAULT_SRGB_SIZE))
2023 vty_out(vty, " segment-routing global-block %u %u",
2024 OspfSR.srgb.start, upper);
2025 vty_out(vty, " local-block %u %u\n", OspfSR.srlb.start,
2026 OspfSR.srlb.end);
2027 } else
2028 vty_out(vty, "\n");
2029
2030 if (OspfSR.msd != 0)
2031 vty_out(vty, " segment-routing node-msd %u\n", OspfSR.msd);
2032
2033 if (OspfSR.self != NULL) {
2034 for (ALL_LIST_ELEMENTS_RO(OspfSR.self->ext_prefix, node, srp)) {
2035 vty_out(vty, " segment-routing prefix %pFX index %u",
2036 &srp->prefv4, srp->sid);
2037 if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_EFLG))
2038 vty_out(vty, " explicit-null\n");
2039 else if (CHECK_FLAG(srp->flags,
2040 EXT_SUBTLV_PREFIX_SID_NPFLG))
2041 vty_out(vty, " no-php-flag\n");
2042 else
2043 vty_out(vty, "\n");
2044 }
2045 }
2046 }
2047
2048 DEFUN(ospf_sr_enable,
2049 ospf_sr_enable_cmd,
2050 "segment-routing on",
2051 SR_STR
2052 "Enable Segment Routing\n")
2053 {
2054
2055 VTY_DECLVAR_INSTANCE_CONTEXT(ospf, ospf);
2056
2057 if (OspfSR.status != SR_OFF)
2058 return CMD_SUCCESS;
2059
2060 if (ospf->vrf_id != VRF_DEFAULT) {
2061 vty_out(vty,
2062 "Segment Routing is only supported in default VRF\n");
2063 return CMD_WARNING_CONFIG_FAILED;
2064 }
2065
2066 osr_debug("SR: Segment Routing: OFF -> ON");
2067
2068 /* Start Segment Routing */
2069 OspfSR.status = SR_ON;
2070 ospf_sr_start(ospf);
2071
2072 return CMD_SUCCESS;
2073 }
2074
2075 DEFUN (no_ospf_sr_enable,
2076 no_ospf_sr_enable_cmd,
2077 "no segment-routing [on]",
2078 NO_STR
2079 SR_STR
2080 "Disable Segment Routing\n")
2081 {
2082
2083 if (OspfSR.status == SR_OFF)
2084 return CMD_SUCCESS;
2085
2086 osr_debug("SR: Segment Routing: ON -> OFF");
2087
2088 /* Start by Disabling Extended Link & Prefix LSA */
2089 ospf_ext_update_sr(false);
2090
2091 /* then, disable Router Information SR parameters */
2092 ospf_router_info_update_sr(false, OspfSR.self);
2093
2094 /* Finally, stop Segment Routing */
2095 ospf_sr_stop();
2096
2097 return CMD_SUCCESS;
2098 }
2099
2100 static int ospf_sr_enabled(struct vty *vty)
2101 {
2102 if (OspfSR.status != SR_OFF)
2103 return 1;
2104
2105 if (vty)
2106 vty_out(vty, "%% OSPF SR is not turned on\n");
2107
2108 return 0;
2109 }
2110
2111 /* tell if two ranges [r1_lower, r1_upper] and [r2_lower,r2_upper] overlap */
2112 static bool ranges_overlap(uint32_t r1_lower, uint32_t r1_upper,
2113 uint32_t r2_lower, uint32_t r2_upper)
2114 {
2115 return !((r1_upper < r2_lower) || (r1_lower > r2_upper));
2116 }
2117
2118
2119 /* tell if a range is valid */
2120 static bool sr_range_is_valid(uint32_t lower, uint32_t upper, uint32_t min_size)
2121 {
2122 return (upper >= lower + min_size);
2123 }
2124
2125 /**
2126 * Update SRGB and/or SRLB using new CLI values.
2127 *
2128 * @param gb_lower Lower bound of the SRGB
2129 * @param gb_upper Upper bound of the SRGB
2130 * @param lb_lower Lower bound of the SRLB
2131 * @param lb_upper Upper bound of the SRLB
2132 *
2133 * @return 0 on success, -1 otherwise
2134 */
2135 static int update_sr_blocks(uint32_t gb_lower, uint32_t gb_upper,
2136 uint32_t lb_lower, uint32_t lb_upper)
2137 {
2138
2139 /* Check if values have changed */
2140 bool gb_changed, lb_changed;
2141 uint32_t gb_size = gb_upper - gb_lower + 1;
2142 uint32_t lb_size = lb_upper - lb_lower + 1;
2143
2144 gb_changed =
2145 (OspfSR.srgb.size != gb_size || OspfSR.srgb.start != gb_lower);
2146 lb_changed =
2147 (OspfSR.srlb.end != lb_upper || OspfSR.srlb.start != lb_lower);
2148 if (!gb_changed && !lb_changed)
2149 return 0;
2150
2151 /* Check if SR is correctly started i.e. Label Manager connected */
2152 if (OspfSR.status != SR_UP) {
2153 OspfSR.srgb.size = gb_size;
2154 OspfSR.srgb.start = gb_lower;
2155 OspfSR.srlb.end = lb_upper;
2156 OspfSR.srlb.start = lb_lower;
2157 return 0;
2158 }
2159
2160 /* Release old SRGB if it has changed and is active. */
2161 if (gb_changed) {
2162
2163 sr_global_block_delete();
2164
2165 /* Set new SRGB values - but do not reserve yet (we need to
2166 * release the SRLB too) */
2167 OspfSR.srgb.size = gb_size;
2168 OspfSR.srgb.start = gb_lower;
2169 if (OspfSR.self != NULL) {
2170 OspfSR.self->srgb.range_size = gb_size;
2171 OspfSR.self->srgb.lower_bound = gb_lower;
2172 }
2173 }
2174 /* Release old SRLB if it has changed and reserve new block as needed.
2175 */
2176 if (lb_changed) {
2177
2178 sr_local_block_delete();
2179
2180 /* Set new SRLB values */
2181 if (sr_local_block_init(lb_lower, lb_upper) < 0) {
2182 ospf_sr_stop();
2183 return -1;
2184 }
2185 if (OspfSR.self != NULL) {
2186 OspfSR.self->srlb.lower_bound = lb_lower;
2187 OspfSR.self->srlb.range_size = lb_size;
2188 }
2189 }
2190
2191 /*
2192 * Try to reserve the new SRGB from the Label Manger. If the
2193 * allocation fails, disable SR until new blocks are successfully
2194 * allocated.
2195 */
2196 if (gb_changed) {
2197 if (sr_global_block_init(OspfSR.srgb.start, OspfSR.srgb.size)
2198 < 0) {
2199 ospf_sr_stop();
2200 return -1;
2201 }
2202 }
2203
2204 /* Update Self SR-Node */
2205 if (OspfSR.self != NULL) {
2206 /* SRGB is reserved, set Router Information parameters */
2207 ospf_router_info_update_sr(true, OspfSR.self);
2208
2209 /* and update NHLFE entries */
2210 if (gb_changed)
2211 hash_iterate(OspfSR.neighbors,
2212 (void (*)(struct hash_bucket *,
2213 void *))update_in_nhlfe,
2214 NULL);
2215
2216 /* and update (LAN)-Adjacency SID */
2217 if (lb_changed)
2218 ospf_ext_link_srlb_update();
2219 }
2220
2221 return 0;
2222 }
2223
2224 DEFUN(sr_global_label_range, sr_global_label_range_cmd,
2225 "segment-routing global-block (16-1048575) (16-1048575) [local-block (16-1048575) (16-1048575)]",
2226 SR_STR
2227 "Segment Routing Global Block label range\n"
2228 "Lower-bound range in decimal (16-1048575)\n"
2229 "Upper-bound range in decimal (16-1048575)\n"
2230 "Segment Routing Local Block label range\n"
2231 "Lower-bound range in decimal (16-1048575)\n"
2232 "Upper-bound range in decimal (16-1048575)\n")
2233 {
2234 uint32_t lb_upper, lb_lower;
2235 uint32_t gb_upper, gb_lower;
2236 int idx_gb_low = 2, idx_gb_up = 3;
2237 int idx_lb_low = 5, idx_lb_up = 6;
2238
2239 /* Get lower and upper bound for mandatory global-block */
2240 gb_lower = strtoul(argv[idx_gb_low]->arg, NULL, 10);
2241 gb_upper = strtoul(argv[idx_gb_up]->arg, NULL, 10);
2242
2243 /* SRLB values are taken from vtysh if there, else use the known ones */
2244 lb_upper = argc > idx_lb_up ? strtoul(argv[idx_lb_up]->arg, NULL, 10)
2245 : OspfSR.srlb.end;
2246 lb_lower = argc > idx_lb_low ? strtoul(argv[idx_lb_low]->arg, NULL, 10)
2247 : OspfSR.srlb.start;
2248
2249 /* check correctness of input SRGB */
2250 if (!sr_range_is_valid(gb_lower, gb_upper, MIN_SRGB_SIZE)) {
2251 vty_out(vty, "Invalid SRGB range\n");
2252 return CMD_WARNING_CONFIG_FAILED;
2253 }
2254
2255 /* check correctness of SRLB */
2256 if (!sr_range_is_valid(lb_lower, lb_upper, MIN_SRLB_SIZE)) {
2257 vty_out(vty, "Invalid SRLB range\n");
2258 return CMD_WARNING_CONFIG_FAILED;
2259 }
2260
2261 /* Validate SRGB against SRLB */
2262 if (ranges_overlap(gb_lower, gb_upper, lb_lower, lb_upper)) {
2263 vty_out(vty,
2264 "New SR Global Block (%u/%u) conflicts with Local Block (%u/%u)\n",
2265 gb_lower, gb_upper, lb_lower, lb_upper);
2266 return CMD_WARNING_CONFIG_FAILED;
2267 }
2268
2269 if (update_sr_blocks(gb_lower, gb_upper, lb_lower, lb_upper) < 0)
2270 return CMD_WARNING_CONFIG_FAILED;
2271 else
2272 return CMD_SUCCESS;
2273 }
2274
2275 DEFUN(no_sr_global_label_range, no_sr_global_label_range_cmd,
2276 "no segment-routing global-block [(16-1048575) (16-1048575) local-block (16-1048575) (16-1048575)]",
2277 NO_STR SR_STR
2278 "Segment Routing Global Block label range\n"
2279 "Lower-bound range in decimal (16-1048575)\n"
2280 "Upper-bound range in decimal (16-1048575)\n"
2281 "Segment Routing Local Block label range\n"
2282 "Lower-bound range in decimal (16-1048575)\n"
2283 "Upper-bound range in decimal (16-1048575)\n")
2284 {
2285 if (update_sr_blocks(DEFAULT_SRGB_LABEL, DEFAULT_SRGB_END,
2286 DEFAULT_SRLB_LABEL, DEFAULT_SRLB_END)
2287 < 0)
2288 return CMD_WARNING_CONFIG_FAILED;
2289 else
2290 return CMD_SUCCESS;
2291 }
2292
2293 DEFUN (sr_node_msd,
2294 sr_node_msd_cmd,
2295 "segment-routing node-msd (1-16)",
2296 SR_STR
2297 "Maximum Stack Depth for this router\n"
2298 "Maximum number of label that could be stack (1-16)\n")
2299 {
2300 uint32_t msd;
2301 int idx = 1;
2302
2303 if (!ospf_sr_enabled(vty))
2304 return CMD_WARNING_CONFIG_FAILED;
2305
2306 /* Get MSD */
2307 argv_find(argv, argc, "(1-16)", &idx);
2308 msd = strtoul(argv[idx]->arg, NULL, 10);
2309 if (msd < 1 || msd > MPLS_MAX_LABELS) {
2310 vty_out(vty, "MSD must be comprise between 1 and %u\n",
2311 MPLS_MAX_LABELS);
2312 return CMD_WARNING_CONFIG_FAILED;
2313 }
2314
2315 /* Check if value has changed */
2316 if (OspfSR.msd == msd)
2317 return CMD_SUCCESS;
2318
2319 /* Set this router MSD */
2320 OspfSR.msd = msd;
2321 if (OspfSR.self != NULL) {
2322 OspfSR.self->msd = msd;
2323
2324 /* Set Router Information parameters if SR is UP */
2325 if (OspfSR.status == SR_UP)
2326 ospf_router_info_update_sr(true, OspfSR.self);
2327 }
2328
2329 return CMD_SUCCESS;
2330 }
2331
2332 DEFUN (no_sr_node_msd,
2333 no_sr_node_msd_cmd,
2334 "no segment-routing node-msd [(1-16)]",
2335 NO_STR
2336 SR_STR
2337 "Maximum Stack Depth for this router\n"
2338 "Maximum number of label that could be stack (1-16)\n")
2339 {
2340
2341 if (!ospf_sr_enabled(vty))
2342 return CMD_WARNING_CONFIG_FAILED;
2343
2344 /* unset this router MSD */
2345 OspfSR.msd = 0;
2346 if (OspfSR.self != NULL) {
2347 OspfSR.self->msd = 0;
2348
2349 /* Set Router Information parameters if SR is UP */
2350 if (OspfSR.status == SR_UP)
2351 ospf_router_info_update_sr(true, OspfSR.self);
2352 }
2353
2354 return CMD_SUCCESS;
2355 }
2356
2357 DEFUN (sr_prefix_sid,
2358 sr_prefix_sid_cmd,
2359 "segment-routing prefix A.B.C.D/M index (0-65535) [no-php-flag|explicit-null]",
2360 SR_STR
2361 "Prefix SID\n"
2362 "IPv4 Prefix as A.B.C.D/M\n"
2363 "SID index for this prefix in decimal (0-65535)\n"
2364 "Index value inside SRGB (lower_bound < index < upper_bound)\n"
2365 "Don't request Penultimate Hop Popping (PHP)\n"
2366 "Upstream neighbor must replace prefix-sid with explicit null label\n")
2367 {
2368 int idx = 0;
2369 struct prefix p, pexist;
2370 uint32_t index;
2371 struct listnode *node;
2372 struct sr_prefix *srp, *exist = NULL;
2373 struct interface *ifp;
2374 bool no_php_flag = false;
2375 bool exp_null = false;
2376 bool index_in_use = false;
2377 uint8_t desired_flags = 0;
2378
2379 if (!ospf_sr_enabled(vty))
2380 return CMD_WARNING_CONFIG_FAILED;
2381
2382 /* Get network prefix */
2383 argv_find(argv, argc, "A.B.C.D/M", &idx);
2384 if (!str2prefix(argv[idx]->arg, &p)) {
2385 vty_out(vty, "Invalid prefix format %s\n", argv[idx]->arg);
2386 return CMD_WARNING_CONFIG_FAILED;
2387 }
2388
2389 /* Get & verify index value */
2390 argv_find(argv, argc, "(0-65535)", &idx);
2391 index = strtoul(argv[idx]->arg, NULL, 10);
2392 if (index > OspfSR.srgb.size - 1) {
2393 vty_out(vty, "Index %u must be lower than range size %u\n",
2394 index, OspfSR.srgb.size);
2395 return CMD_WARNING_CONFIG_FAILED;
2396 }
2397
2398 /* Get options */
2399 no_php_flag = argv_find(argv, argc, "no-php-flag", &idx);
2400 exp_null = argv_find(argv, argc, "explicit-null", &idx);
2401
2402 desired_flags |= no_php_flag ? EXT_SUBTLV_PREFIX_SID_NPFLG : 0;
2403 desired_flags |= exp_null ? EXT_SUBTLV_PREFIX_SID_NPFLG : 0;
2404 desired_flags |= exp_null ? EXT_SUBTLV_PREFIX_SID_EFLG : 0;
2405
2406 /* Search for an existing Prefix-SID */
2407 for (ALL_LIST_ELEMENTS_RO(OspfSR.self->ext_prefix, node, srp)) {
2408 if (prefix_same((struct prefix *)&srp->prefv4, &p))
2409 exist = srp;
2410 if (srp->sid == index) {
2411 index_in_use = true;
2412 pexist = p;
2413 }
2414 }
2415
2416 /* done if prefix segment already there with same index and flags */
2417 if (exist && exist->sid == index && exist->flags == desired_flags)
2418 return CMD_SUCCESS;
2419
2420 /* deny if index is already in use by a distinct prefix */
2421 if (!exist && index_in_use) {
2422 vty_out(vty, "Index %u is already used by %pFX\n", index,
2423 &pexist);
2424 return CMD_WARNING_CONFIG_FAILED;
2425 }
2426
2427 /* First, remove old NHLFE if installed */
2428 if (exist && CHECK_FLAG(exist->flags, EXT_SUBTLV_PREFIX_SID_NPFLG)
2429 && !CHECK_FLAG(exist->flags, EXT_SUBTLV_PREFIX_SID_EFLG))
2430 ospf_zebra_delete_prefix_sid(exist);
2431
2432 /* Create new Extended Prefix to SRDB if not found */
2433 if (exist == NULL) {
2434 srp = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_prefix));
2435 IPV4_ADDR_COPY(&srp->prefv4.prefix, &p.u.prefix4);
2436 srp->prefv4.prefixlen = p.prefixlen;
2437 srp->prefv4.family = p.family;
2438 srp->sid = index;
2439 srp->type = LOCAL_SID;
2440 } else {
2441 /* we work on the existing SR prefix */
2442 srp = exist;
2443 }
2444
2445 /* Reset labels to handle flag update */
2446 srp->label_in = 0;
2447 srp->nhlfe.label_out = 0;
2448 srp->sid = index;
2449 srp->flags = desired_flags;
2450
2451 /* If NO PHP flag is present, compute NHLFE and set label */
2452 if (no_php_flag) {
2453 srp->label_in = index2label(srp->sid, OspfSR.self->srgb);
2454 srp->nhlfe.label_out = MPLS_LABEL_IMPLICIT_NULL;
2455 }
2456
2457 osr_debug("SR (%s): Add new index %u to Prefix %pFX", __func__, index,
2458 (struct prefix *)&srp->prefv4);
2459
2460 /* Get Interface and check if it is a Loopback */
2461 ifp = if_lookup_prefix(&p, VRF_DEFAULT);
2462 if (ifp == NULL) {
2463 /*
2464 * Interface could be not yet available i.e. when this
2465 * command is in the configuration file, OSPF is not yet
2466 * ready. In this case, store the prefix SID for latter
2467 * update of this Extended Prefix
2468 */
2469 if (exist == NULL)
2470 listnode_add(OspfSR.self->ext_prefix, srp);
2471 zlog_info(
2472 "Interface for prefix %pFX not found. Deferred LSA flooding",
2473 &p);
2474 return CMD_SUCCESS;
2475 }
2476
2477 if (!if_is_loopback(ifp)) {
2478 vty_out(vty, "interface %s is not a Loopback\n", ifp->name);
2479 XFREE(MTYPE_OSPF_SR_PARAMS, srp);
2480 return CMD_WARNING_CONFIG_FAILED;
2481 }
2482 srp->nhlfe.ifindex = ifp->ifindex;
2483
2484 /* Add SR Prefix if new */
2485 if (!exist)
2486 listnode_add(OspfSR.self->ext_prefix, srp);
2487
2488 /* Update Prefix SID if SR is UP */
2489 if (OspfSR.status == SR_UP) {
2490 if (no_php_flag && !exp_null)
2491 ospf_zebra_update_prefix_sid(srp);
2492 } else
2493 return CMD_SUCCESS;
2494
2495 /* Finally, update Extended Prefix LSA id SR is UP */
2496 srp->instance = ospf_ext_schedule_prefix_index(
2497 ifp, srp->sid, &srp->prefv4, srp->flags);
2498 if (srp->instance == 0) {
2499 vty_out(vty, "Unable to set index %u for prefix %pFX\n",
2500 index, &p);
2501 return CMD_WARNING;
2502 }
2503
2504 return CMD_SUCCESS;
2505 }
2506
2507 DEFUN (no_sr_prefix_sid,
2508 no_sr_prefix_sid_cmd,
2509 "no segment-routing prefix A.B.C.D/M [index (0-65535)|no-php-flag|explicit-null]",
2510 NO_STR
2511 SR_STR
2512 "Prefix SID\n"
2513 "IPv4 Prefix as A.B.C.D/M\n"
2514 "SID index for this prefix in decimal (0-65535)\n"
2515 "Index value inside SRGB (lower_bound < index < upper_bound)\n"
2516 "Don't request Penultimate Hop Popping (PHP)\n"
2517 "Upstream neighbor must replace prefix-sid with explicit null label\n")
2518 {
2519 int idx = 0;
2520 struct prefix p;
2521 struct listnode *node;
2522 struct sr_prefix *srp;
2523 struct interface *ifp;
2524 bool found = false;
2525 int rc;
2526
2527 if (!ospf_sr_enabled(vty))
2528 return CMD_WARNING_CONFIG_FAILED;
2529
2530 if (OspfSR.status != SR_UP)
2531 return CMD_SUCCESS;
2532
2533 /* Get network prefix */
2534 argv_find(argv, argc, "A.B.C.D/M", &idx);
2535 rc = str2prefix(argv[idx]->arg, &p);
2536 if (!rc) {
2537 vty_out(vty, "Invalid prefix format %s\n", argv[idx]->arg);
2538 return CMD_WARNING_CONFIG_FAILED;
2539 }
2540
2541 /* check that the prefix is already set */
2542 for (ALL_LIST_ELEMENTS_RO(OspfSR.self->ext_prefix, node, srp))
2543 if (IPV4_ADDR_SAME(&srp->prefv4.prefix, &p.u.prefix4)
2544 && (srp->prefv4.prefixlen == p.prefixlen)) {
2545 found = true;
2546 break;
2547 }
2548
2549 if (!found) {
2550 vty_out(vty, "Prefix %s is not found. Abort!\n",
2551 argv[idx]->arg);
2552 return CMD_WARNING_CONFIG_FAILED;
2553 }
2554
2555 osr_debug("SR (%s): Remove Prefix %pFX with index %u", __func__,
2556 (struct prefix *)&srp->prefv4, srp->sid);
2557
2558 /* Get Interface */
2559 ifp = if_lookup_by_index(srp->nhlfe.ifindex, VRF_DEFAULT);
2560 if (ifp == NULL) {
2561 vty_out(vty, "interface for prefix %s not found.\n",
2562 argv[idx]->arg);
2563 /* silently remove from list */
2564 listnode_delete(OspfSR.self->ext_prefix, srp);
2565 XFREE(MTYPE_OSPF_SR_PARAMS, srp);
2566 return CMD_SUCCESS;
2567 }
2568
2569 /* Update Extended Prefix LSA */
2570 if (!ospf_ext_schedule_prefix_index(ifp, 0, NULL, 0)) {
2571 vty_out(vty, "No corresponding loopback interface. Abort!\n");
2572 return CMD_WARNING;
2573 }
2574
2575 /* Delete NHLFE if NO-PHP is set and EXPLICIT NULL not set */
2576 if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_NPFLG)
2577 && !CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_EFLG))
2578 ospf_zebra_delete_prefix_sid(srp);
2579
2580 /* OK, all is clean, remove SRP from SRDB */
2581 listnode_delete(OspfSR.self->ext_prefix, srp);
2582 XFREE(MTYPE_OSPF_SR_PARAMS, srp);
2583
2584 return CMD_SUCCESS;
2585 }
2586
2587
2588 static char *sr_op2str(char *buf, size_t size, mpls_label_t label_in,
2589 mpls_label_t label_out)
2590 {
2591 if (size < 24)
2592 return NULL;
2593
2594 switch (label_out) {
2595 case MPLS_LABEL_IMPLICIT_NULL:
2596 snprintf(buf, size, "Pop(%u)", label_in);
2597 break;
2598 case MPLS_LABEL_IPV4_EXPLICIT_NULL:
2599 if (label_in == MPLS_LABEL_IPV4_EXPLICIT_NULL)
2600 snprintf(buf, size, "no-op.");
2601 else
2602 snprintf(buf, size, "Swap(%u, null)", label_in);
2603 break;
2604 case MPLS_INVALID_LABEL:
2605 snprintf(buf, size, "no-op.");
2606 break;
2607 default:
2608 snprintf(buf, size, "Swap(%u, %u)", label_in, label_out);
2609 break;
2610 }
2611 return buf;
2612 }
2613
2614 static void show_sr_prefix(struct sbuf *sbuf, struct json_object *json,
2615 struct sr_prefix *srp)
2616 {
2617
2618 struct listnode *node;
2619 struct ospf_path *path;
2620 struct interface *itf;
2621 json_object *json_route = NULL, *json_obj;
2622 char pref[19];
2623 char sid[22];
2624 char op[32];
2625 char buf[PREFIX_STRLEN];
2626 int indent = 0;
2627
2628 snprintfrr(pref, 19, "%pFX", (struct prefix *)&srp->prefv4);
2629 snprintf(sid, 22, "SR Pfx (idx %u)", srp->sid);
2630 if (json) {
2631 json_object_string_add(json, "prefix", pref);
2632 json_object_int_add(json, "sid", srp->sid);
2633 json_object_int_add(json, "inputLabel", srp->label_in);
2634 } else {
2635 sbuf_push(sbuf, 0, "%18s %21s ", pref, sid);
2636 }
2637
2638 /* Check if it is a Local Node SID */
2639 if (srp->type == LOCAL_SID) {
2640 itf = if_lookup_by_index(srp->nhlfe.ifindex, VRF_DEFAULT);
2641 if (json) {
2642 if (!json_route) {
2643 json_route = json_object_new_array();
2644 json_object_object_add(json, "prefixRoute",
2645 json_route);
2646 }
2647 json_obj = json_object_new_object();
2648 json_object_int_add(json_obj, "outputLabel",
2649 srp->nhlfe.label_out);
2650 json_object_string_add(json_obj, "interface",
2651 itf ? itf->name : "-");
2652 json_object_string_addf(json_obj, "nexthop", "%pI4",
2653 &srp->nhlfe.nexthop);
2654 json_object_array_add(json_route, json_obj);
2655 } else {
2656 sbuf_push(sbuf, 0, "%20s %9s %15s\n",
2657 sr_op2str(op, 32, srp->label_in,
2658 srp->nhlfe.label_out),
2659 itf ? itf->name : "-",
2660 inet_ntop(AF_INET, &srp->nhlfe.nexthop,
2661 buf, sizeof(buf)));
2662 }
2663 return;
2664 }
2665
2666 /* Check if we have a valid path for this prefix */
2667 if (srp->route == NULL) {
2668 if (!json) {
2669 sbuf_push(sbuf, 0, "\n");
2670 }
2671 return;
2672 }
2673
2674 /* Process list of OSPF paths */
2675 for (ALL_LIST_ELEMENTS_RO(srp->route->paths, node, path)) {
2676 itf = if_lookup_by_index(path->ifindex, VRF_DEFAULT);
2677 if (json) {
2678 if (!json_route) {
2679 json_route = json_object_new_array();
2680 json_object_object_add(json, "prefixRoute",
2681 json_route);
2682 }
2683 json_obj = json_object_new_object();
2684 json_object_int_add(json_obj, "outputLabel",
2685 path->srni.label_out);
2686 json_object_string_add(json_obj, "interface",
2687 itf ? itf->name : "-");
2688 json_object_string_addf(json_obj, "nexthop", "%pI4",
2689 &path->nexthop);
2690 json_object_array_add(json_route, json_obj);
2691 } else {
2692 sbuf_push(sbuf, indent, "%20s %9s %15s\n",
2693 sr_op2str(op, 32, srp->label_in,
2694 path->srni.label_out),
2695 itf ? itf->name : "-",
2696 inet_ntop(AF_INET, &path->nexthop, buf,
2697 sizeof(buf)));
2698 /* Offset to align information for ECMP */
2699 indent = 43;
2700 }
2701 }
2702 }
2703
2704 static void show_sr_node(struct vty *vty, struct json_object *json,
2705 struct sr_node *srn)
2706 {
2707
2708 struct listnode *node;
2709 struct sr_link *srl;
2710 struct sr_prefix *srp;
2711 struct interface *itf;
2712 struct sbuf sbuf;
2713 char pref[19];
2714 char sid[22];
2715 char op[32];
2716 char buf[PREFIX_STRLEN];
2717 uint32_t upper;
2718 json_object *json_node = NULL, *json_algo, *json_obj;
2719 json_object *json_prefix = NULL, *json_link = NULL;
2720
2721 /* Sanity Check */
2722 if (srn == NULL)
2723 return;
2724
2725 sbuf_init(&sbuf, NULL, 0);
2726
2727 if (json) {
2728 json_node = json_object_new_object();
2729 json_object_string_addf(json_node, "routerID", "%pI4",
2730 &srn->adv_router);
2731 json_object_int_add(json_node, "srgbSize",
2732 srn->srgb.range_size);
2733 json_object_int_add(json_node, "srgbLabel",
2734 srn->srgb.lower_bound);
2735 json_object_int_add(json_node, "srlbSize",
2736 srn->srlb.range_size);
2737 json_object_int_add(json_node, "srlbLabel",
2738 srn->srlb.lower_bound);
2739 json_algo = json_object_new_array();
2740 json_object_object_add(json_node, "algorithms", json_algo);
2741 for (int i = 0; i < ALGORITHM_COUNT; i++) {
2742 if (srn->algo[i] == SR_ALGORITHM_UNSET)
2743 continue;
2744 json_obj = json_object_new_object();
2745 char tmp[2];
2746
2747 snprintf(tmp, sizeof(tmp), "%u", i);
2748 json_object_string_add(json_obj, tmp,
2749 srn->algo[i] == SR_ALGORITHM_SPF
2750 ? "SPF"
2751 : "S-SPF");
2752 json_object_array_add(json_algo, json_obj);
2753 }
2754 if (srn->msd != 0)
2755 json_object_int_add(json_node, "nodeMsd", srn->msd);
2756 } else {
2757 sbuf_push(&sbuf, 0, "SR-Node: %pI4", &srn->adv_router);
2758 upper = srn->srgb.lower_bound + srn->srgb.range_size - 1;
2759 sbuf_push(&sbuf, 0, "\tSRGB: [%u/%u]",
2760 srn->srgb.lower_bound, upper);
2761 upper = srn->srlb.lower_bound + srn->srlb.range_size - 1;
2762 sbuf_push(&sbuf, 0, "\tSRLB: [%u/%u]",
2763 srn->srlb.lower_bound, upper);
2764 sbuf_push(&sbuf, 0, "\tAlgo.(s): %s",
2765 srn->algo[0] == SR_ALGORITHM_SPF ? "SPF" : "S-SPF");
2766 for (int i = 1; i < ALGORITHM_COUNT; i++) {
2767 if (srn->algo[i] == SR_ALGORITHM_UNSET)
2768 continue;
2769 sbuf_push(&sbuf, 0, "/%s",
2770 srn->algo[i] == SR_ALGORITHM_SPF ? "SPF"
2771 : "S-SPF");
2772 }
2773 if (srn->msd != 0)
2774 sbuf_push(&sbuf, 0, "\tMSD: %u", srn->msd);
2775 }
2776
2777 if (!json) {
2778 sbuf_push(&sbuf, 0,
2779 "\n\n Prefix or Link Node or Adj. SID Label Operation Interface Nexthop\n");
2780 sbuf_push(&sbuf, 0,
2781 "------------------ --------------------- -------------------- --------- ---------------\n");
2782 }
2783 for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp)) {
2784 if (json) {
2785 if (!json_prefix) {
2786 json_prefix = json_object_new_array();
2787 json_object_object_add(json_node,
2788 "extendedPrefix",
2789 json_prefix);
2790 }
2791 json_obj = json_object_new_object();
2792 show_sr_prefix(NULL, json_obj, srp);
2793 json_object_array_add(json_prefix, json_obj);
2794 } else {
2795 show_sr_prefix(&sbuf, NULL, srp);
2796 }
2797 }
2798
2799 for (ALL_LIST_ELEMENTS_RO(srn->ext_link, node, srl)) {
2800 snprintfrr(pref, 19, "%pI4/32", &srl->itf_addr);
2801 snprintf(sid, 22, "SR Adj. (lbl %u)", srl->sid[0]);
2802 itf = if_lookup_by_index(srl->nhlfe[0].ifindex, VRF_DEFAULT);
2803 if (json) {
2804 if (!json_link) {
2805 json_link = json_object_new_array();
2806 json_object_object_add(
2807 json_node, "extendedLink", json_link);
2808 }
2809 /* Primary Link */
2810 json_obj = json_object_new_object();
2811 json_object_string_add(json_obj, "prefix", pref);
2812 json_object_int_add(json_obj, "sid", srl->sid[0]);
2813 json_object_int_add(json_obj, "inputLabel",
2814 srl->nhlfe[0].label_in);
2815 json_object_int_add(json_obj, "outputLabel",
2816 srl->nhlfe[0].label_out);
2817 json_object_string_add(json_obj, "interface",
2818 itf ? itf->name : "-");
2819 json_object_string_addf(json_obj, "nexthop", "%pI4",
2820 &srl->nhlfe[0].nexthop);
2821 json_object_array_add(json_link, json_obj);
2822 /* Backup Link */
2823 json_obj = json_object_new_object();
2824 snprintf(sid, 22, "SR Adj. (lbl %u)", srl->sid[1]);
2825 json_object_string_add(json_obj, "prefix", pref);
2826 json_object_int_add(json_obj, "sid", srl->sid[1]);
2827 json_object_int_add(json_obj, "inputLabel",
2828 srl->nhlfe[1].label_in);
2829 json_object_int_add(json_obj, "outputLabel",
2830 srl->nhlfe[1].label_out);
2831 json_object_string_add(json_obj, "interface",
2832 itf ? itf->name : "-");
2833 json_object_string_addf(json_obj, "nexthop", "%pI4",
2834 &srl->nhlfe[1].nexthop);
2835 json_object_array_add(json_link, json_obj);
2836 } else {
2837 sbuf_push(&sbuf, 0, "%18s %21s %20s %9s %15s\n",
2838 pref, sid,
2839 sr_op2str(op, 32, srl->nhlfe[0].label_in,
2840 srl->nhlfe[0].label_out),
2841 itf ? itf->name : "-",
2842 inet_ntop(AF_INET, &srl->nhlfe[0].nexthop,
2843 buf, sizeof(buf)));
2844 snprintf(sid, 22, "SR Adj. (lbl %u)", srl->sid[1]);
2845 sbuf_push(&sbuf, 0, "%18s %21s %20s %9s %15s\n",
2846 pref, sid,
2847 sr_op2str(op, 32, srl->nhlfe[1].label_in,
2848 srl->nhlfe[1].label_out),
2849 itf ? itf->name : "-",
2850 inet_ntop(AF_INET, &srl->nhlfe[1].nexthop,
2851 buf, sizeof(buf)));
2852 }
2853 }
2854 if (json)
2855 json_object_array_add(json, json_node);
2856 else
2857 vty_out(vty, "%s\n", sbuf_buf(&sbuf));
2858
2859 sbuf_free(&sbuf);
2860 }
2861
2862 static void show_vty_srdb(struct hash_bucket *bucket, void *args)
2863 {
2864 struct vty *vty = (struct vty *)args;
2865 struct sr_node *srn = (struct sr_node *)bucket->data;
2866
2867 show_sr_node(vty, NULL, srn);
2868 }
2869
2870 static void show_json_srdb(struct hash_bucket *bucket, void *args)
2871 {
2872 struct json_object *json = (struct json_object *)args;
2873 struct sr_node *srn = (struct sr_node *)bucket->data;
2874
2875 show_sr_node(NULL, json, srn);
2876 }
2877
2878 DEFUN (show_ip_opsf_srdb,
2879 show_ip_ospf_srdb_cmd,
2880 "show ip ospf database segment-routing [adv-router A.B.C.D|self-originate] [json]",
2881 SHOW_STR
2882 IP_STR
2883 OSPF_STR
2884 "Database summary\n"
2885 "Show Segment Routing Data Base\n"
2886 "Advertising SR node\n"
2887 "Advertising SR node ID (as an IP address)\n"
2888 "Self-originated SR node\n"
2889 JSON_STR)
2890 {
2891 int idx = 0;
2892 struct in_addr rid;
2893 struct sr_node *srn;
2894 bool uj = use_json(argc, argv);
2895 json_object *json = NULL, *json_node_array = NULL;
2896
2897 if (OspfSR.status == SR_OFF) {
2898 vty_out(vty, "Segment Routing is disabled on this router\n");
2899 return CMD_WARNING;
2900 }
2901
2902 if (uj) {
2903 json = json_object_new_object();
2904 json_node_array = json_object_new_array();
2905 json_object_string_addf(json, "srdbID", "%pI4",
2906 &OspfSR.self->adv_router);
2907 json_object_object_add(json, "srNodes", json_node_array);
2908 } else {
2909 vty_out(vty,
2910 "\n\t\tOSPF Segment Routing database for ID %pI4\n\n",
2911 &OspfSR.self->adv_router);
2912 }
2913
2914 if (argv_find(argv, argc, "self-originate", &idx)) {
2915 srn = OspfSR.self;
2916 show_sr_node(vty, json_node_array, srn);
2917 if (uj)
2918 vty_json(vty, json);
2919 return CMD_SUCCESS;
2920 }
2921
2922 if (argv_find(argv, argc, "A.B.C.D", &idx)) {
2923 if (!inet_aton(argv[idx]->arg, &rid)) {
2924 vty_out(vty, "Specified Router ID %s is invalid\n",
2925 argv[idx]->arg);
2926 return CMD_WARNING_CONFIG_FAILED;
2927 }
2928 /* Get the SR Node from the SRDB */
2929 srn = (struct sr_node *)hash_lookup(OspfSR.neighbors,
2930 (void *)&rid);
2931 show_sr_node(vty, json_node_array, srn);
2932 if (uj)
2933 vty_json(vty, json);
2934 return CMD_SUCCESS;
2935 }
2936
2937 /* No parameters have been provided, Iterate through all the SRDB */
2938 if (uj) {
2939 hash_iterate(OspfSR.neighbors, (void (*)(struct hash_bucket *,
2940 void *))show_json_srdb,
2941 (void *)json_node_array);
2942 vty_json(vty, json);
2943 } else {
2944 hash_iterate(OspfSR.neighbors, (void (*)(struct hash_bucket *,
2945 void *))show_vty_srdb,
2946 (void *)vty);
2947 }
2948 return CMD_SUCCESS;
2949 }
2950
2951 /* Install new CLI commands */
2952 void ospf_sr_register_vty(void)
2953 {
2954 install_element(VIEW_NODE, &show_ip_ospf_srdb_cmd);
2955
2956 install_element(OSPF_NODE, &ospf_sr_enable_cmd);
2957 install_element(OSPF_NODE, &no_ospf_sr_enable_cmd);
2958 install_element(OSPF_NODE, &sr_global_label_range_cmd);
2959 install_element(OSPF_NODE, &no_sr_global_label_range_cmd);
2960 install_element(OSPF_NODE, &sr_node_msd_cmd);
2961 install_element(OSPF_NODE, &no_sr_node_msd_cmd);
2962 install_element(OSPF_NODE, &sr_prefix_sid_cmd);
2963 install_element(OSPF_NODE, &no_sr_prefix_sid_cmd);
2964 }
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