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Merge pull request #2858 from Jafaral/sphinx
[mirror_frr.git] / ospfd / ospf_sr.c
1 /*
2 * This is an implementation of Segment Routing
3 * as per draft draft-ietf-ospf-segment-routing-extensions-24
4 *
5 * Module name: Segment Routing
6 *
7 * Author: Olivier Dugeon <olivier.dugeon@orange.com>
8 * Author: Anselme Sawadogo <anselmesawadogo@gmail.com>
9 *
10 * Copyright (C) 2016 - 2018 Orange Labs http://www.orange.com
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 2 of the License, or (at your option)
15 * any later version.
16 *
17 * This program is distributed in the hope that it will be useful, but WITHOUT
18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
20 * more details.
21 *
22 * You should have received a copy of the GNU General Public License along
23 * with this program; see the file COPYING; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
25 */
26
27 #include <math.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <zebra.h>
31
32 #include "command.h"
33 #include "hash.h"
34 #include "if.h"
35 #include "if.h"
36 #include "jhash.h"
37 #include "libospf.h" /* for ospf interface types */
38 #include "linklist.h"
39 #include "log.h"
40 #include "memory.h"
41 #include "monotime.h"
42 #include "network.h"
43 #include "prefix.h"
44 #include "sockunion.h" /* for inet_aton() */
45 #include "stream.h"
46 #include "table.h"
47 #include "thread.h"
48 #include "vty.h"
49 #include "zclient.h"
50 #include <lib/json.h>
51 #include "ospf_errors.h"
52
53 #include "ospfd/ospfd.h"
54 #include "ospfd/ospf_interface.h"
55 #include "ospfd/ospf_ism.h"
56 #include "ospfd/ospf_asbr.h"
57 #include "ospfd/ospf_lsa.h"
58 #include "ospfd/ospf_lsdb.h"
59 #include "ospfd/ospf_neighbor.h"
60 #include "ospfd/ospf_nsm.h"
61 #include "ospfd/ospf_flood.h"
62 #include "ospfd/ospf_packet.h"
63 #include "ospfd/ospf_spf.h"
64 #include "ospfd/ospf_dump.h"
65 #include "ospfd/ospf_route.h"
66 #include "ospfd/ospf_ase.h"
67 #include "ospfd/ospf_sr.h"
68 #include "ospfd/ospf_ri.h"
69 #include "ospfd/ospf_ext.h"
70 #include "ospfd/ospf_zebra.h"
71
72 /*
73 * Global variable to manage Segment Routing on this node.
74 * Note that all parameter values are stored in network byte order.
75 */
76 static struct ospf_sr_db OspfSR;
77 static void ospf_sr_register_vty(void);
78 static inline void del_sid_nhlfe(struct sr_nhlfe nhlfe);
79
80 /*
81 * Segment Routing Data Base functions
82 */
83
84 /* Hash function for Segment Routing entry */
85 static unsigned int sr_hash(void *p)
86 {
87 const struct in_addr *rid = p;
88
89 return jhash_1word(rid->s_addr, 0);
90 }
91
92 /* Compare 2 Router ID hash entries based on SR Node */
93 static int sr_cmp(const void *p1, const void *p2)
94 {
95 const struct sr_node *srn = p1;
96 const struct in_addr *rid = p2;
97
98 return IPV4_ADDR_SAME(&srn->adv_router, rid);
99 }
100
101 /* Functions to remove an SR Link */
102 static void del_sr_link(void *val)
103 {
104 struct sr_link *srl = (struct sr_link *)val;
105
106 del_sid_nhlfe(srl->nhlfe[0]);
107 del_sid_nhlfe(srl->nhlfe[1]);
108 XFREE(MTYPE_OSPF_SR_PARAMS, val);
109 }
110
111 /* Functions to remove an SR Prefix */
112 static void del_sr_pref(void *val)
113 {
114 struct sr_prefix *srp = (struct sr_prefix *)val;
115
116 del_sid_nhlfe(srp->nhlfe);
117 XFREE(MTYPE_OSPF_SR_PARAMS, val);
118 }
119
120 /* Allocate new Segment Routine node */
121 static struct sr_node *sr_node_new(struct in_addr *rid)
122 {
123
124 if (rid == NULL)
125 return NULL;
126
127 struct sr_node *new;
128
129 /* Allocate Segment Routing node memory */
130 new = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_node));
131
132 /* Default Algorithm, SRGB and MSD */
133 for (int i = 0; i < ALGORITHM_COUNT; i++)
134 new->algo[i] = SR_ALGORITHM_UNSET;
135
136 new->srgb.range_size = 0;
137 new->srgb.lower_bound = 0;
138 new->msd = 0;
139
140 /* Create Link, Prefix and Range TLVs list */
141 new->ext_link = list_new();
142 new->ext_prefix = list_new();
143 new->ext_link->del = del_sr_link;
144 new->ext_prefix->del = del_sr_pref;
145
146 IPV4_ADDR_COPY(&new->adv_router, rid);
147 new->neighbor = NULL;
148 new->instance = 0;
149
150 if (IS_DEBUG_OSPF_SR)
151 zlog_debug(" |- Created new SR node for %s",
152 inet_ntoa(new->adv_router));
153 return new;
154 }
155
156 /* Delete Segment Routing node */
157 static void sr_node_del(struct sr_node *srn)
158 {
159 /* Sanity Check */
160 if (srn == NULL)
161 return;
162
163 /* Clean Extended Link */
164 list_delete_and_null(&srn->ext_link);
165
166 /* Clean Prefix List */
167 list_delete_and_null(&srn->ext_prefix);
168
169 XFREE(MTYPE_OSPF_SR_PARAMS, srn);
170 }
171
172 /* Get SR Node for a given nexthop */
173 static struct sr_node *get_sr_node_by_nexthop(struct ospf *ospf,
174 struct in_addr nexthop)
175 {
176 struct ospf_interface *oi = NULL;
177 struct ospf_neighbor *nbr = NULL;
178 struct listnode *node;
179 struct route_node *rn;
180 struct sr_node *srn;
181 bool found;
182
183 /* Sanity check */
184 if (OspfSR.neighbors == NULL)
185 return NULL;
186
187 if (IS_DEBUG_OSPF_SR)
188 zlog_debug(" |- Search SR-Node for nexthop %s",
189 inet_ntoa(nexthop));
190
191 /* First, search neighbor Router ID for this nexthop */
192 found = false;
193 for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi)) {
194 for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
195 nbr = rn->info;
196 if ((nbr) && (IPV4_ADDR_SAME(&nexthop, &nbr->src))) {
197 found = true;
198 break;
199 }
200 }
201 if (found)
202 break;
203 }
204
205 if (!found)
206 return NULL;
207
208 if (IS_DEBUG_OSPF_SR)
209 zlog_debug(" |- Found nexthop Router ID %s",
210 inet_ntoa(nbr->router_id));
211 /* Then, search SR Node */
212 srn = (struct sr_node *)hash_lookup(OspfSR.neighbors, &nbr->router_id);
213
214 return srn;
215 }
216
217 /*
218 * Segment Routing Initialization functions
219 */
220
221 /* Segment Routing starter function */
222 static int ospf_sr_start(struct ospf *ospf)
223 {
224 struct route_node *rn;
225 struct ospf_lsa *lsa;
226 struct sr_node *srn;
227 int rc = 0;
228
229 if (IS_DEBUG_OSPF_SR)
230 zlog_debug("SR (%s): Start Segment Routing", __func__);
231
232 /* Initialize self SR Node */
233 srn = hash_get(OspfSR.neighbors, (void *)&(ospf->router_id),
234 (void *)sr_node_new);
235
236 /* Sanity Check */
237 if (srn == NULL)
238 return rc;
239
240 /* Complete & Store self SR Node */
241 srn->srgb.range_size = OspfSR.srgb.range_size;
242 srn->srgb.lower_bound = OspfSR.srgb.lower_bound;
243 srn->algo[0] = OspfSR.algo[0];
244 srn->msd = OspfSR.msd;
245 OspfSR.self = srn;
246
247 if (IS_DEBUG_OSPF_EVENT)
248 zlog_debug("SR (%s): Update SR-DB from LSDB", __func__);
249
250 /* Start by looking to Router Info & Extended LSA in lsdb */
251 if ((ospf != NULL) && (ospf->backbone != NULL)) {
252 LSDB_LOOP (OPAQUE_AREA_LSDB(ospf->backbone), rn, lsa) {
253 if (IS_LSA_MAXAGE(lsa) || IS_LSA_SELF(lsa))
254 continue;
255 int lsa_id =
256 GET_OPAQUE_TYPE(ntohl(lsa->data->id.s_addr));
257 switch (lsa_id) {
258 case OPAQUE_TYPE_ROUTER_INFORMATION_LSA:
259 ospf_sr_ri_lsa_update(lsa);
260 break;
261 case OPAQUE_TYPE_EXTENDED_PREFIX_LSA:
262 ospf_sr_ext_prefix_lsa_update(lsa);
263 break;
264 case OPAQUE_TYPE_EXTENDED_LINK_LSA:
265 ospf_sr_ext_link_lsa_update(lsa);
266 break;
267 default:
268 break;
269 }
270 }
271 }
272
273 rc = 1;
274 return rc;
275 }
276
277 /* Stop Segment Routing */
278 static void ospf_sr_stop(void)
279 {
280
281 if (IS_DEBUG_OSPF_SR)
282 zlog_debug("SR (%s): Stop Segment Routing", __func__);
283
284 /*
285 * Remove all SR Nodes from the Hash table. Prefix and Link SID will
286 * be remove though list_delete_and_null() call. See sr_node_del()
287 */
288 hash_clean(OspfSR.neighbors, (void *)sr_node_del);
289 }
290
291 /*
292 * Segment Routing initialize function
293 *
294 * @param - nothing
295 *
296 * @return 0 if OK, -1 otherwise
297 */
298 int ospf_sr_init(void)
299 {
300 int rc = -1;
301
302 if (IS_DEBUG_OSPF_SR)
303 zlog_info("SR (%s): Initialize SR Data Base", __func__);
304
305 memset(&OspfSR, 0, sizeof(struct ospf_sr_db));
306 OspfSR.enabled = false;
307 /* Only AREA flooding is supported in this release */
308 OspfSR.scope = OSPF_OPAQUE_AREA_LSA;
309
310 /* Initialize SRGB, Algorithms and MSD TLVs */
311 /* Only Algorithm SPF is supported */
312 OspfSR.algo[0] = SR_ALGORITHM_SPF;
313 for (int i = 1; i < ALGORITHM_COUNT; i++)
314 OspfSR.algo[i] = SR_ALGORITHM_UNSET;
315
316 OspfSR.srgb.range_size = MPLS_DEFAULT_MAX_SRGB_SIZE;
317 OspfSR.srgb.lower_bound = MPLS_DEFAULT_MIN_SRGB_LABEL;
318 OspfSR.msd = 0;
319
320 /* Initialize Hash table for neighbor SR nodes */
321 OspfSR.neighbors = hash_create(sr_hash, sr_cmp, "OSPF_SR");
322 if (OspfSR.neighbors == NULL)
323 return rc;
324
325 /* Initialize Route Table for prefix */
326 OspfSR.prefix = route_table_init();
327 if (OspfSR.prefix == NULL)
328 return rc;
329
330 /* Register Segment Routing VTY command */
331 ospf_sr_register_vty();
332
333 rc = 0;
334 return rc;
335 }
336
337 /*
338 * Segment Routing termination function
339 *
340 * @param - nothing
341 * @return - nothing
342 */
343 void ospf_sr_term(void)
344 {
345
346 /* Stop Segment Routing */
347 ospf_sr_stop();
348
349 /* Clear SR Node Table */
350 if (OspfSR.neighbors)
351 hash_free(OspfSR.neighbors);
352
353 /* Clear Prefix Table */
354 if (OspfSR.prefix)
355 route_table_finish(OspfSR.prefix);
356
357 OspfSR.enabled = false;
358 OspfSR.self = NULL;
359 }
360
361 /*
362 * Segment Routing finish function
363 *
364 * @param - nothing
365 * @return - nothing
366 */
367 void ospf_sr_finish(void)
368 {
369 /* Stop Segment Routing */
370 ospf_sr_stop();
371
372 OspfSR.enabled = false;
373 }
374
375 /*
376 * Following functions are used to manipulate the
377 * Next Hop Label Forwarding entry (NHLFE)
378 */
379
380 /* Compute label from index */
381 static mpls_label_t index2label(uint32_t index, struct sr_srgb srgb)
382 {
383 mpls_label_t label;
384
385 label = srgb.lower_bound + index;
386 if (label > (srgb.lower_bound + srgb.range_size))
387 return MPLS_INVALID_LABEL;
388 else
389 return label;
390 }
391
392 /* Get neighbor full structure from address */
393 static struct ospf_neighbor *get_neighbor_by_addr(struct ospf *top,
394 struct in_addr addr)
395 {
396 struct ospf_neighbor *nbr;
397 struct ospf_interface *oi;
398 struct listnode *node;
399 struct route_node *rn;
400
401 /* Sanity Check */
402 if (top == NULL)
403 return NULL;
404
405 for (ALL_LIST_ELEMENTS_RO(top->oiflist, node, oi))
406 for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
407 nbr = rn->info;
408 if (nbr)
409 if (IPV4_ADDR_SAME(&nbr->address.u.prefix4,
410 &addr)
411 || IPV4_ADDR_SAME(&nbr->router_id, &addr)) {
412 route_unlock_node(rn);
413 return nbr;
414 }
415 }
416 return NULL;
417 }
418
419 /* Get OSPF Path from address */
420 static struct ospf_path *get_nexthop_by_addr(struct ospf *top,
421 struct prefix_ipv4 p)
422 {
423 struct ospf_route * or ;
424 struct ospf_path *path;
425 struct listnode *node;
426 struct route_node *rn;
427
428 /* Sanity Check */
429 if (top == NULL)
430 return NULL;
431
432 if (IS_DEBUG_OSPF_SR)
433 zlog_debug(" |- Search Nexthop for prefix %s/%u",
434 inet_ntoa(p.prefix), p.prefixlen);
435
436 rn = route_node_lookup(top->new_table, (struct prefix *)&p);
437
438 /*
439 * Check if we found an OSPF route. May be NULL if SPF has not
440 * yet populate routing table for this prefix.
441 */
442 if (rn == NULL)
443 return NULL;
444
445 route_unlock_node(rn);
446 or = rn->info;
447 if (or == NULL)
448 return NULL;
449
450 /* Then search path from this route */
451 for (ALL_LIST_ELEMENTS_RO(or->paths, node, path))
452 if (path->nexthop.s_addr != INADDR_ANY || path->ifindex != 0)
453 return path;
454
455 return NULL;
456 }
457
458 /* Compute NHLFE entry for Extended Link */
459 static int compute_link_nhlfe(struct sr_link *srl)
460 {
461 struct ospf *top = ospf_lookup_by_vrf_id(VRF_DEFAULT);
462 struct ospf_neighbor *nh;
463 int rc = 0;
464
465 if (IS_DEBUG_OSPF_SR)
466 zlog_debug(" |- Compute NHLFE for link %s/%u",
467 inet_ntoa(srl->nhlfe[0].prefv4.prefix),
468 srl->nhlfe[0].prefv4.prefixlen);
469
470 /* First determine the OSPF Neighbor */
471 nh = get_neighbor_by_addr(top, srl->nhlfe[0].nexthop);
472
473 /* Neighbor could be not found when OSPF Adjacency just fire up
474 * because SPF don't yet populate routing table. This NHLFE will
475 * be fixed later when SR SPF schedule will be called.
476 */
477 if (nh == NULL)
478 return rc;
479
480 if (IS_DEBUG_OSPF_SR)
481 zlog_debug(" |- Found nexthop NHLFE %s",
482 inet_ntoa(nh->router_id));
483
484 /* Set ifindex for this neighbor */
485 srl->nhlfe[0].ifindex = nh->oi->ifp->ifindex;
486 srl->nhlfe[1].ifindex = nh->oi->ifp->ifindex;
487
488 /* Update neighbor address for LAN_ADJ_SID */
489 if (srl->type == LAN_ADJ_SID) {
490 IPV4_ADDR_COPY(&srl->nhlfe[0].nexthop, &nh->src);
491 IPV4_ADDR_COPY(&srl->nhlfe[1].nexthop, &nh->src);
492 }
493
494 /* Set Input & Output Label */
495 if (CHECK_FLAG(srl->flags[0], EXT_SUBTLV_LINK_ADJ_SID_VFLG))
496 srl->nhlfe[0].label_in = srl->sid[0];
497 else
498 srl->nhlfe[0].label_in =
499 index2label(srl->sid[0], srl->srn->srgb);
500 if (CHECK_FLAG(srl->flags[1], EXT_SUBTLV_LINK_ADJ_SID_VFLG))
501 srl->nhlfe[1].label_in = srl->sid[1];
502 else
503 srl->nhlfe[1].label_in =
504 index2label(srl->sid[1], srl->srn->srgb);
505
506 srl->nhlfe[0].label_out = MPLS_LABEL_IMPLICIT_NULL;
507 srl->nhlfe[1].label_out = MPLS_LABEL_IMPLICIT_NULL;
508
509 rc = 1;
510 return rc;
511 }
512
513 /*
514 * Compute NHLFE entry for Extended Prefix
515 *
516 * @param srp - Segment Routing Prefix
517 *
518 * @return -1 if next hop is not found, 0 if nexthop has not changed
519 * and 1 if success
520 */
521 static int compute_prefix_nhlfe(struct sr_prefix *srp)
522 {
523 struct ospf *top = ospf_lookup_by_vrf_id(VRF_DEFAULT);
524 struct ospf_path *nh = NULL;
525 struct sr_node *srnext;
526 int rc = -1;
527
528 if (IS_DEBUG_OSPF_SR)
529 zlog_debug(" |- Compute NHLFE for prefix %s/%u",
530 inet_ntoa(srp->nhlfe.prefv4.prefix),
531 srp->nhlfe.prefv4.prefixlen);
532
533 /* First determine the nexthop */
534 nh = get_nexthop_by_addr(top, srp->nhlfe.prefv4);
535
536 /* Nexthop could be not found when OSPF Adjacency just fire up
537 * because SPF don't yet populate routing table. This NHLFE will
538 * be fixed later when SR SPF schedule will be called.
539 */
540 if (nh == NULL)
541 return rc;
542
543 /* Check if NextHop has changed when call after running a new SPF */
544 if (IPV4_ADDR_SAME(&nh->nexthop, &srp->nhlfe.nexthop)
545 && (nh->ifindex == srp->nhlfe.ifindex))
546 return 0;
547
548 if (IS_DEBUG_OSPF_SR)
549 zlog_debug(" |- Found new next hop for this NHLFE: %s",
550 inet_ntoa(nh->nexthop));
551
552 /*
553 * Get SR-Node for this nexthop. Could be not yet available
554 * as Extende Link / Prefix and Router Information are flooded
555 * after LSA Type 1 & 2 which populate the OSPF Route Table
556 */
557 srnext = get_sr_node_by_nexthop(top, nh->nexthop);
558 if (srnext == NULL)
559 return rc;
560
561 /* And store this information for later update if SR Node is found */
562 srnext->neighbor = OspfSR.self;
563 if (IPV4_ADDR_SAME(&srnext->adv_router, &srp->adv_router))
564 srp->nexthop = NULL;
565 else
566 srp->nexthop = srnext;
567
568 /*
569 * SR Node could be known, but SRGB could be not initialize
570 * This is due to the fact that Extended Link / Prefix could
571 * be received before corresponding Router Information LSA
572 */
573 if ((srnext == NULL) || (srnext->srgb.lower_bound == 0)
574 || (srnext->srgb.range_size == 0))
575 return rc;
576
577 if (IS_DEBUG_OSPF_SR)
578 zlog_debug(" |- Found SRGB %u/%u for next hop SR-Node %s",
579 srnext->srgb.range_size, srnext->srgb.lower_bound,
580 inet_ntoa(srnext->adv_router));
581
582 /* Set ip addr & ifindex for this neighbor */
583 IPV4_ADDR_COPY(&srp->nhlfe.nexthop, &nh->nexthop);
584 srp->nhlfe.ifindex = nh->ifindex;
585
586 /* Compute Input Label with self SRGB */
587 srp->nhlfe.label_in = index2label(srp->sid, OspfSR.srgb);
588 /*
589 * and Output Label with Next hop SR Node SRGB or Implicit Null label
590 * if next hop is the destination and request PHP
591 */
592 if ((srp->nexthop == NULL)
593 && (!CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_NPFLG)))
594 srp->nhlfe.label_out = MPLS_LABEL_IMPLICIT_NULL;
595 else if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_VFLG))
596 srp->nhlfe.label_out = srp->sid;
597 else
598 srp->nhlfe.label_out = index2label(srp->sid, srnext->srgb);
599
600 if (IS_DEBUG_OSPF_SR)
601 zlog_debug(" |- Computed new labels in: %u out: %u",
602 srp->nhlfe.label_in, srp->nhlfe.label_out);
603
604 rc = 1;
605 return rc;
606 }
607
608 /* Send MPLS Label entry to Zebra for installation or deletion */
609 static int ospf_zebra_send_mpls_labels(int cmd, struct sr_nhlfe nhlfe)
610 {
611 struct stream *s;
612
613 /* Reset stream. */
614 s = zclient->obuf;
615 stream_reset(s);
616
617 zclient_create_header(s, cmd, VRF_DEFAULT);
618 stream_putc(s, ZEBRA_LSP_SR);
619 /* OSPF Segment Routing currently support only IPv4 */
620 stream_putl(s, nhlfe.prefv4.family);
621 stream_put_in_addr(s, &nhlfe.prefv4.prefix);
622 stream_putc(s, nhlfe.prefv4.prefixlen);
623 stream_put_in_addr(s, &nhlfe.nexthop);
624 stream_putl(s, nhlfe.ifindex);
625 stream_putc(s, OSPF_SR_PRIORITY_DEFAULT);
626 stream_putl(s, nhlfe.label_in);
627 stream_putl(s, nhlfe.label_out);
628
629 /* Put length at the first point of the stream. */
630 stream_putw_at(s, 0, stream_get_endp(s));
631
632 if (IS_DEBUG_OSPF_SR)
633 zlog_debug(" |- %s LSP %u/%u for %s/%u via %u",
634 cmd == ZEBRA_MPLS_LABELS_ADD ? "Add" : "Delete",
635 nhlfe.label_in, nhlfe.label_out,
636 inet_ntoa(nhlfe.prefv4.prefix),
637 nhlfe.prefv4.prefixlen, nhlfe.ifindex);
638
639 return zclient_send_message(zclient);
640 }
641
642 /* Request zebra to install/remove FEC in FIB */
643 static int ospf_zebra_send_mpls_ftn(int cmd, struct sr_nhlfe nhlfe)
644 {
645 struct zapi_route api;
646 struct zapi_nexthop *api_nh;
647
648 /* Support only IPv4 */
649 if (nhlfe.prefv4.family != AF_INET)
650 return -1;
651
652 memset(&api, 0, sizeof(api));
653 api.vrf_id = VRF_DEFAULT;
654 api.type = ZEBRA_ROUTE_OSPF;
655 api.safi = SAFI_UNICAST;
656 memcpy(&api.prefix, &nhlfe.prefv4, sizeof(struct prefix_ipv4));
657
658 if (cmd == ZEBRA_ROUTE_ADD) {
659 /* Metric value. */
660 SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
661 api.metric = OSPF_SR_DEFAULT_METRIC;
662 /* Nexthop */
663 SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
664 api_nh = &api.nexthops[0];
665 IPV4_ADDR_COPY(&api_nh->gate.ipv4, &nhlfe.nexthop);
666 api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
667 api_nh->ifindex = nhlfe.ifindex;
668 /* MPLS labels */
669 SET_FLAG(api.message, ZAPI_MESSAGE_LABEL);
670 api_nh->labels[0] = nhlfe.label_out;
671 api_nh->label_num = 1;
672 api_nh->vrf_id = VRF_DEFAULT;
673 api.nexthop_num = 1;
674 }
675
676 if (IS_DEBUG_OSPF_SR)
677 zlog_debug(" |- %s FEC %u for %s/%u via %u",
678 cmd == ZEBRA_ROUTE_ADD ? "Add" : "Delete",
679 nhlfe.label_out, inet_ntoa(nhlfe.prefv4.prefix),
680 nhlfe.prefv4.prefixlen, nhlfe.ifindex);
681
682 return zclient_route_send(cmd, zclient, &api);
683 }
684
685 /* Add new NHLFE entry for SID */
686 static inline void add_sid_nhlfe(struct sr_nhlfe nhlfe)
687 {
688 if ((nhlfe.label_in != 0) && (nhlfe.label_out != 0)) {
689 ospf_zebra_send_mpls_labels(ZEBRA_MPLS_LABELS_ADD, nhlfe);
690 if (nhlfe.label_out != MPLS_LABEL_IMPLICIT_NULL)
691 ospf_zebra_send_mpls_ftn(ZEBRA_ROUTE_ADD, nhlfe);
692 }
693 }
694
695 /* Remove NHLFE entry for SID */
696 static inline void del_sid_nhlfe(struct sr_nhlfe nhlfe)
697 {
698 if ((nhlfe.label_in != 0) && (nhlfe.label_out != 0)) {
699 ospf_zebra_send_mpls_labels(ZEBRA_MPLS_LABELS_DELETE, nhlfe);
700 if (nhlfe.label_out != MPLS_LABEL_IMPLICIT_NULL)
701 ospf_zebra_send_mpls_ftn(ZEBRA_ROUTE_DELETE, nhlfe);
702 }
703 }
704
705 /* Update NHLFE entry for SID */
706 static inline void update_sid_nhlfe(struct sr_nhlfe n1, struct sr_nhlfe n2)
707 {
708
709 del_sid_nhlfe(n1);
710 add_sid_nhlfe(n2);
711 }
712
713 /*
714 * Functions to parse and get Extended Link / Prefix
715 * TLVs and SubTLVs
716 */
717
718 /* Extended Link SubTLVs Getter */
719 static struct sr_link *get_ext_link_sid(struct tlv_header *tlvh)
720 {
721
722 struct sr_link *srl;
723 struct ext_tlv_link *link = (struct ext_tlv_link *)tlvh;
724 struct ext_subtlv_adj_sid *adj_sid;
725 struct ext_subtlv_lan_adj_sid *lan_sid;
726 struct ext_subtlv_rmt_itf_addr *rmt_itf;
727
728 struct tlv_header *sub_tlvh;
729 uint16_t length = 0, sum = 0, i = 0;
730
731 srl = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_link));
732
733 /* Initialize TLV browsing */
734 length = ntohs(tlvh->length) - EXT_TLV_LINK_SIZE;
735 sub_tlvh = (struct tlv_header *)((char *)(tlvh) + TLV_HDR_SIZE
736 + EXT_TLV_LINK_SIZE);
737 for (; sum < length; sub_tlvh = TLV_HDR_NEXT(sub_tlvh)) {
738 switch (ntohs(sub_tlvh->type)) {
739 case EXT_SUBTLV_ADJ_SID:
740 adj_sid = (struct ext_subtlv_adj_sid *)sub_tlvh;
741 srl->type = ADJ_SID;
742 i = CHECK_FLAG(adj_sid->flags,
743 EXT_SUBTLV_LINK_ADJ_SID_BFLG)
744 ? 1
745 : 0;
746 srl->flags[i] = adj_sid->flags;
747 if (CHECK_FLAG(adj_sid->flags,
748 EXT_SUBTLV_LINK_ADJ_SID_VFLG))
749 srl->sid[i] = GET_LABEL(ntohl(adj_sid->value));
750 else
751 srl->sid[i] = ntohl(adj_sid->value);
752 IPV4_ADDR_COPY(&srl->nhlfe[i].nexthop, &link->link_id);
753 break;
754 case EXT_SUBTLV_LAN_ADJ_SID:
755 lan_sid = (struct ext_subtlv_lan_adj_sid *)sub_tlvh;
756 srl->type = LAN_ADJ_SID;
757 i = CHECK_FLAG(lan_sid->flags,
758 EXT_SUBTLV_LINK_ADJ_SID_BFLG)
759 ? 1
760 : 0;
761 srl->flags[i] = lan_sid->flags;
762 if (CHECK_FLAG(lan_sid->flags,
763 EXT_SUBTLV_LINK_ADJ_SID_VFLG))
764 srl->sid[i] = GET_LABEL(ntohl(lan_sid->value));
765 else
766 srl->sid[i] = ntohl(lan_sid->value);
767 IPV4_ADDR_COPY(&srl->nhlfe[i].nexthop,
768 &lan_sid->neighbor_id);
769 break;
770 case EXT_SUBTLV_RMT_ITF_ADDR:
771 rmt_itf = (struct ext_subtlv_rmt_itf_addr *)sub_tlvh;
772 IPV4_ADDR_COPY(&srl->nhlfe[0].nexthop, &rmt_itf->value);
773 IPV4_ADDR_COPY(&srl->nhlfe[1].nexthop, &rmt_itf->value);
774 break;
775 default:
776 break;
777 }
778 sum += TLV_SIZE(sub_tlvh);
779 }
780
781 IPV4_ADDR_COPY(&srl->nhlfe[0].prefv4.prefix, &link->link_data);
782 srl->nhlfe[0].prefv4.prefixlen = IPV4_MAX_PREFIXLEN;
783 srl->nhlfe[0].prefv4.family = AF_INET;
784 apply_mask_ipv4(&srl->nhlfe[0].prefv4);
785 IPV4_ADDR_COPY(&srl->nhlfe[1].prefv4.prefix, &link->link_data);
786 srl->nhlfe[1].prefv4.prefixlen = IPV4_MAX_PREFIXLEN;
787 srl->nhlfe[1].prefv4.family = AF_INET;
788 apply_mask_ipv4(&srl->nhlfe[1].prefv4);
789
790 if (IS_DEBUG_OSPF_SR) {
791 zlog_debug(" |- Found primary Adj/Lan Sid %u for %s/%u",
792 srl->sid[0], inet_ntoa(srl->nhlfe[0].prefv4.prefix),
793 srl->nhlfe[0].prefv4.prefixlen);
794 zlog_debug(" |- Found backup Adj/Lan Sid %u for %s/%u",
795 srl->sid[1], inet_ntoa(srl->nhlfe[1].prefv4.prefix),
796 srl->nhlfe[1].prefv4.prefixlen);
797 }
798
799 return srl;
800 }
801
802 /* Extended Prefix SubTLVs Getter */
803 static struct sr_prefix *get_ext_prefix_sid(struct tlv_header *tlvh)
804 {
805
806 struct sr_prefix *srp;
807 struct ext_tlv_prefix *pref = (struct ext_tlv_prefix *)tlvh;
808 struct ext_subtlv_prefix_sid *psid;
809
810 struct tlv_header *sub_tlvh;
811 uint16_t length = 0, sum = 0;
812
813 srp = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_prefix));
814
815 /* Initialize TLV browsing */
816 length = ntohs(tlvh->length) - EXT_TLV_PREFIX_SIZE;
817 sub_tlvh = (struct tlv_header *)((char *)(tlvh) + TLV_HDR_SIZE
818 + EXT_TLV_PREFIX_SIZE);
819 for (; sum < length; sub_tlvh = TLV_HDR_NEXT(sub_tlvh)) {
820 switch (ntohs(sub_tlvh->type)) {
821 case EXT_SUBTLV_PREFIX_SID:
822 psid = (struct ext_subtlv_prefix_sid *)sub_tlvh;
823 if (psid->algorithm != SR_ALGORITHM_SPF) {
824 flog_err(OSPF_ERR_SR_INVALID_ALGORITHM,
825 "SR (%s): Unsupported Algorithm",
826 __func__);
827 XFREE(MTYPE_OSPF_SR_PARAMS, srp);
828 return NULL;
829 }
830 srp->type = PREF_SID;
831 srp->flags = psid->flags;
832 if (CHECK_FLAG(psid->flags, EXT_SUBTLV_PREFIX_SID_VFLG))
833 srp->sid = GET_LABEL(ntohl(psid->value));
834 else
835 srp->sid = ntohl(psid->value);
836 IPV4_ADDR_COPY(&srp->nhlfe.prefv4.prefix,
837 &pref->address);
838 srp->nhlfe.prefv4.prefixlen = pref->pref_length;
839 srp->nhlfe.prefv4.family = AF_INET;
840 apply_mask_ipv4(&srp->nhlfe.prefv4);
841 break;
842 default:
843 break;
844 }
845 sum += TLV_SIZE(sub_tlvh);
846 }
847
848 if (IS_DEBUG_OSPF_SR)
849 zlog_debug(" |- Found SID %u for prefix %s/%u", srp->sid,
850 inet_ntoa(srp->nhlfe.prefv4.prefix),
851 srp->nhlfe.prefv4.prefixlen);
852 return srp;
853 }
854
855 /*
856 * Functions to manipulate Segment Routing Link & Prefix structures
857 */
858
859 /* Compare two Segment Link: return 0 if equal, 1 otherwise */
860 static inline int sr_link_cmp(struct sr_link *srl1, struct sr_link *srl2)
861 {
862 if ((srl1->sid[0] == srl2->sid[0]) && (srl1->sid[1] == srl2->sid[1])
863 && (srl1->type == srl2->type) && (srl1->flags[0] == srl2->flags[0])
864 && (srl1->flags[1] == srl2->flags[1]))
865 return 0;
866 else
867 return 1;
868 }
869
870 /* Compare two Segment Prefix: return 0 if equal, 1 otherwise */
871 static inline int sr_prefix_cmp(struct sr_prefix *srp1, struct sr_prefix *srp2)
872 {
873 if ((srp1->sid == srp2->sid) && (srp1->flags == srp2->flags))
874 return 0;
875 else
876 return 1;
877 }
878
879 /* Update Segment Link of given Segment Routing Node */
880 static void update_ext_link_sid(struct sr_node *srn, struct sr_link *srl,
881 uint8_t lsa_flags)
882 {
883 struct listnode *node;
884 struct sr_link *lk;
885 bool found = false;
886
887 /* Sanity check */
888 if ((srn == NULL) || (srl == NULL))
889 return;
890
891 if (IS_DEBUG_OSPF_SR)
892 zlog_debug(" |- Process Extended Link Adj/Lan-SID");
893
894 /* Process only Local Adj/Lan_Adj SID coming from LSA SELF */
895 if (!CHECK_FLAG(srl->flags[0], EXT_SUBTLV_LINK_ADJ_SID_LFLG)
896 || !CHECK_FLAG(srl->flags[1], EXT_SUBTLV_LINK_ADJ_SID_LFLG)
897 || !CHECK_FLAG(lsa_flags, OSPF_LSA_SELF))
898 return;
899
900 /* Search for existing Segment Link */
901 for (ALL_LIST_ELEMENTS_RO(srn->ext_link, node, lk))
902 if (lk->instance == srl->instance) {
903 found = true;
904 break;
905 }
906
907 if (IS_DEBUG_OSPF_SR)
908 zlog_debug(" |- %s SR Link 8.0.0.%u for SR node %s",
909 found ? "Update" : "Add",
910 GET_OPAQUE_ID(srl->instance),
911 inet_ntoa(srn->adv_router));
912
913 /* if not found, add new Segment Link and install NHLFE */
914 if (!found) {
915 /* Complete SR-Link and add it to SR-Node list */
916 srl->srn = srn;
917 IPV4_ADDR_COPY(&srl->adv_router, &srn->adv_router);
918 listnode_add(srn->ext_link, srl);
919 /* Try to set MPLS table */
920 if (compute_link_nhlfe(srl)) {
921 add_sid_nhlfe(srl->nhlfe[0]);
922 add_sid_nhlfe(srl->nhlfe[1]);
923 }
924 } else {
925 if (sr_link_cmp(lk, srl)) {
926 if (compute_link_nhlfe(srl)) {
927 update_sid_nhlfe(lk->nhlfe[0], srl->nhlfe[0]);
928 update_sid_nhlfe(lk->nhlfe[1], srl->nhlfe[1]);
929 /* Replace Segment List */
930 listnode_delete(srn->ext_link, lk);
931 XFREE(MTYPE_OSPF_SR_PARAMS, lk);
932 srl->srn = srn;
933 IPV4_ADDR_COPY(&srl->adv_router,
934 &srn->adv_router);
935 listnode_add(srn->ext_link, srl);
936 } else {
937 /* New NHLFE was not found.
938 * Just free the SR Link
939 */
940 XFREE(MTYPE_OSPF_SR_PARAMS, srl);
941 }
942 } else {
943 /*
944 * This is just an LSA refresh.
945 * Stop processing and free SR Link
946 */
947 XFREE(MTYPE_OSPF_SR_PARAMS, srl);
948 }
949 }
950 }
951
952 /* Update Segment Prefix of given Segment Routing Node */
953 static void update_ext_prefix_sid(struct sr_node *srn, struct sr_prefix *srp)
954 {
955
956 struct listnode *node;
957 struct sr_prefix *pref;
958 bool found = false;
959
960 /* Sanity check */
961 if (srn == NULL || srp == NULL)
962 return;
963
964 if (IS_DEBUG_OSPF_SR)
965 zlog_debug(" |- Process Extended Prefix SID %u", srp->sid);
966
967 /* Process only Global Prefix SID */
968 if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_LFLG))
969 return;
970
971 /* Search for existing Segment Prefix */
972 for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, pref))
973 if (pref->instance == srp->instance) {
974 found = true;
975 break;
976 }
977
978 if (IS_DEBUG_OSPF_SR)
979 zlog_debug(" |- %s SR LSA ID 7.0.0.%u for SR node %s",
980 found ? "Update" : "Add",
981 GET_OPAQUE_ID(srp->instance),
982 inet_ntoa(srn->adv_router));
983
984 /* if not found, add new Segment Prefix and install NHLFE */
985 if (!found) {
986 /* Complete SR-Prefix and add it to SR-Node list */
987 srp->srn = srn;
988 IPV4_ADDR_COPY(&srp->adv_router, &srn->adv_router);
989 listnode_add(srn->ext_prefix, srp);
990 /* Try to set MPLS table */
991 if (compute_prefix_nhlfe(srp) == 1)
992 add_sid_nhlfe(srp->nhlfe);
993 } else {
994 if (sr_prefix_cmp(pref, srp)) {
995 if (compute_prefix_nhlfe(srp) == 1) {
996 update_sid_nhlfe(pref->nhlfe, srp->nhlfe);
997 /* Replace Segment Prefix */
998 listnode_delete(srn->ext_prefix, pref);
999 XFREE(MTYPE_OSPF_SR_PARAMS, pref);
1000 srp->srn = srn;
1001 IPV4_ADDR_COPY(&srp->adv_router,
1002 &srn->adv_router);
1003 listnode_add(srn->ext_prefix, srp);
1004 } else {
1005 /* New NHLFE was not found.
1006 * Just free the SR Prefix
1007 */
1008 XFREE(MTYPE_OSPF_SR_PARAMS, srp);
1009 }
1010 } else {
1011 /* This is just an LSA refresh.
1012 * Stop processing and free SR Prefix
1013 */
1014 XFREE(MTYPE_OSPF_SR_PARAMS, srp);
1015 }
1016 }
1017 }
1018
1019 /*
1020 * When change the FRR Self SRGB, update the NHLFE Input Label
1021 * for all Extended Prefix with SID index through hash_iterate()
1022 */
1023 static void update_in_nhlfe(struct hash_backet *backet, void *args)
1024 {
1025 struct listnode *node;
1026 struct sr_node *srn = (struct sr_node *)backet->data;
1027 struct sr_prefix *srp;
1028 struct sr_nhlfe new;
1029
1030 /* Process Every Extended Prefix for this SR-Node */
1031 for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp)) {
1032 /* Process Self SRN only if NO-PHP is requested */
1033 if ((srn == OspfSR.self)
1034 && !CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_NPFLG))
1035 continue;
1036
1037 /* Process only SID Index */
1038 if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_VFLG))
1039 continue;
1040
1041 /* OK. Compute new NHLFE */
1042 memcpy(&new, &srp->nhlfe, sizeof(struct sr_nhlfe));
1043 new.label_in = index2label(srp->sid, OspfSR.srgb);
1044 /* Update MPLS LFIB */
1045 update_sid_nhlfe(srp->nhlfe, new);
1046 /* Finally update Input Label */
1047 srp->nhlfe.label_in = new.label_in;
1048 }
1049 }
1050
1051 /*
1052 * When SRGB has changed, update NHLFE Output Label for all Extended Prefix
1053 * with SID index which use the given SR-Node as nexthop though hash_iterate()
1054 */
1055 static void update_out_nhlfe(struct hash_backet *backet, void *args)
1056 {
1057 struct listnode *node;
1058 struct sr_node *srn = (struct sr_node *)backet->data;
1059 struct sr_node *srnext = (struct sr_node *)args;
1060 struct sr_prefix *srp;
1061 struct sr_nhlfe new;
1062
1063 for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp)) {
1064 /* Process only SID Index for next hop without PHP */
1065 if ((srp->nexthop == NULL)
1066 && (!CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_NPFLG)))
1067 continue;
1068 memcpy(&new, &srp->nhlfe, sizeof(struct sr_nhlfe));
1069 new.label_out = index2label(srp->sid, srnext->srgb);
1070 update_sid_nhlfe(srp->nhlfe, new);
1071 srp->nhlfe.label_out = new.label_out;
1072 }
1073 }
1074
1075 /*
1076 * Following functions are call when new Segment Routing LSA are received
1077 * - Router Information: ospf_sr_ri_lsa_update() & ospf_sr_ri_lsa_delete()
1078 * - Extended Link: ospf_sr_ext_link_update() & ospf_sr_ext_link_delete()
1079 * - Extended Prefix: ospf_ext_prefix_update() & ospf_sr_ext_prefix_delete()
1080 */
1081
1082 /* Update Segment Routing from Router Information LSA */
1083 void ospf_sr_ri_lsa_update(struct ospf_lsa *lsa)
1084 {
1085 struct sr_node *srn;
1086 struct tlv_header *tlvh;
1087 struct lsa_header *lsah = (struct lsa_header *)lsa->data;
1088 struct ri_sr_tlv_sid_label_range *ri_srgb;
1089 struct ri_sr_tlv_sr_algorithm *algo;
1090 struct sr_srgb srgb;
1091 uint16_t length = 0, sum = 0;
1092
1093 if (IS_DEBUG_OSPF_SR)
1094 zlog_debug(
1095 "SR (%s): Process Router "
1096 "Information LSA 4.0.0.%u from %s",
1097 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1098 inet_ntoa(lsah->adv_router));
1099
1100 /* Sanity check */
1101 if (IS_LSA_SELF(lsa))
1102 return;
1103
1104 if (OspfSR.neighbors == NULL) {
1105 flog_err(OSPF_ERR_SR_INVALID_DB,
1106 "SR (%s): Abort! no valid SR DataBase", __func__);
1107 return;
1108 }
1109
1110 /* Get SR Node in hash table from Router ID */
1111 srn = hash_get(OspfSR.neighbors, (void *)&(lsah->adv_router),
1112 (void *)sr_node_new);
1113
1114 /* Sanity check */
1115 if (srn == NULL) {
1116 flog_err(OSPF_ERR_SR_NODE_CREATE,
1117 "SR (%s): Abort! can't create SR node in hash table",
1118 __func__);
1119 return;
1120 }
1121
1122 if ((srn->instance != 0) && (srn->instance != ntohl(lsah->id.s_addr))) {
1123 flog_err(OSPF_ERR_SR_INVALID_LSA_ID,
1124 "SR (%s): Abort! Wrong "
1125 "LSA ID 4.0.0.%u for SR node %s/%u",
1126 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1127 inet_ntoa(lsah->adv_router), srn->instance);
1128 return;
1129 }
1130
1131 /* Collect Router Information Sub TLVs */
1132 /* Initialize TLV browsing */
1133 length = ntohs(lsah->length) - OSPF_LSA_HEADER_SIZE;
1134 srgb.range_size = 0;
1135 srgb.lower_bound = 0;
1136
1137 for (tlvh = TLV_HDR_TOP(lsah); (sum < length) && (tlvh != NULL);
1138 tlvh = TLV_HDR_NEXT(tlvh)) {
1139 switch (ntohs(tlvh->type)) {
1140 case RI_SR_TLV_SR_ALGORITHM:
1141 algo = (struct ri_sr_tlv_sr_algorithm *)tlvh;
1142 int i;
1143
1144 for (i = 0; i < ntohs(algo->header.length); i++)
1145 srn->algo[i] = algo->value[0];
1146 for (; i < ALGORITHM_COUNT; i++)
1147 srn->algo[i] = SR_ALGORITHM_UNSET;
1148 sum += TLV_SIZE(tlvh);
1149 break;
1150 case RI_SR_TLV_SID_LABEL_RANGE:
1151 ri_srgb = (struct ri_sr_tlv_sid_label_range *)tlvh;
1152 srgb.range_size = GET_RANGE_SIZE(ntohl(ri_srgb->size));
1153 srgb.lower_bound =
1154 GET_LABEL(ntohl(ri_srgb->lower.value));
1155 sum += TLV_SIZE(tlvh);
1156 break;
1157 case RI_SR_TLV_NODE_MSD:
1158 srn->msd = ((struct ri_sr_tlv_node_msd *)(tlvh))->value;
1159 sum += TLV_SIZE(tlvh);
1160 break;
1161 default:
1162 sum += TLV_SIZE(tlvh);
1163 break;
1164 }
1165 }
1166
1167 /* Check that we collect mandatory parameters */
1168 if (srn->algo[0] == SR_ALGORITHM_UNSET || srgb.range_size == 0
1169 || srgb.lower_bound == 0) {
1170 zlog_warn("SR (%s): Missing mandatory parameters. Abort!",
1171 __func__);
1172 hash_release(OspfSR.neighbors, &(srn->adv_router));
1173 XFREE(MTYPE_OSPF_SR_PARAMS, srn);
1174 return;
1175 }
1176
1177 /* Check if it is a new SR Node or not */
1178 if (srn->instance == 0) {
1179 /* update LSA ID */
1180 srn->instance = ntohl(lsah->id.s_addr);
1181 /* Copy SRGB */
1182 srn->srgb.range_size = srgb.range_size;
1183 srn->srgb.lower_bound = srgb.lower_bound;
1184 }
1185
1186 /* Check if SRGB has changed */
1187 if ((srn->srgb.range_size != srgb.range_size)
1188 || (srn->srgb.lower_bound != srgb.lower_bound)) {
1189 srn->srgb.range_size = srgb.range_size;
1190 srn->srgb.lower_bound = srgb.lower_bound;
1191 /* Update NHLFE if it is a neighbor SR node */
1192 if (srn->neighbor == OspfSR.self)
1193 hash_iterate(OspfSR.neighbors,
1194 (void (*)(struct hash_backet *,
1195 void *))update_out_nhlfe,
1196 (void *)srn);
1197 }
1198 }
1199
1200 /*
1201 * Delete SR Node entry in hash table information corresponding to an expired
1202 * Router Information LSA
1203 */
1204 void ospf_sr_ri_lsa_delete(struct ospf_lsa *lsa)
1205 {
1206 struct sr_node *srn;
1207 struct lsa_header *lsah = (struct lsa_header *)lsa->data;
1208
1209 if (IS_DEBUG_OSPF_SR)
1210 zlog_debug("SR (%s): Remove SR node %s from lsa_id 4.0.0.%u",
1211 __func__, inet_ntoa(lsah->adv_router),
1212 GET_OPAQUE_ID(ntohl(lsah->id.s_addr)));
1213
1214 /* Sanity check */
1215 if (OspfSR.neighbors == NULL) {
1216 flog_err(OSPF_ERR_SR_INVALID_DB,
1217 "SR (%s): Abort! no valid SR Data Base", __func__);
1218 return;
1219 }
1220
1221 /* Release Router ID entry in SRDB hash table */
1222 srn = hash_release(OspfSR.neighbors, &(lsah->adv_router));
1223
1224 /* Sanity check */
1225 if (srn == NULL) {
1226 flog_err(OSPF_ERR_SR_NODE_CREATE,
1227 "SR (%s): Abort! no entry in SRDB for SR Node %s",
1228 __func__, inet_ntoa(lsah->adv_router));
1229 return;
1230 }
1231
1232 if ((srn->instance != 0) && (srn->instance != ntohl(lsah->id.s_addr))) {
1233 flog_err(
1234 OSPF_ERR_SR_INVALID_LSA_ID,
1235 "SR (%s): Abort! Wrong LSA ID 4.0.0.%u for SR node %s",
1236 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1237 inet_ntoa(lsah->adv_router));
1238 return;
1239 }
1240
1241 /* Remove SR node */
1242 sr_node_del(srn);
1243 }
1244
1245 /* Update Segment Routing from Extended Link LSA */
1246 void ospf_sr_ext_link_lsa_update(struct ospf_lsa *lsa)
1247 {
1248 struct sr_node *srn;
1249 struct tlv_header *tlvh;
1250 struct lsa_header *lsah = (struct lsa_header *)lsa->data;
1251 struct sr_link *srl;
1252
1253 uint16_t length, sum;
1254
1255 if (IS_DEBUG_OSPF_SR)
1256 zlog_debug(
1257 "SR (%s): Process Extended Link LSA 8.0.0.%u from %s",
1258 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1259 inet_ntoa(lsah->adv_router));
1260
1261 /* Sanity check */
1262 if (OspfSR.neighbors == NULL) {
1263 flog_err(OSPF_ERR_SR_INVALID_DB,
1264 "SR (%s): Abort! no valid SR DataBase", __func__);
1265 return;
1266 }
1267
1268 /* Get SR Node in hash table from Router ID */
1269 srn = (struct sr_node *)hash_get(OspfSR.neighbors,
1270 (void *)&(lsah->adv_router),
1271 (void *)sr_node_new);
1272
1273 /* Sanity check */
1274 if (srn == NULL) {
1275 flog_err(OSPF_ERR_SR_NODE_CREATE,
1276 "SR (%s): Abort! can't create SR node in hash table",
1277 __func__);
1278 return;
1279 }
1280
1281 /* Initialize TLV browsing */
1282 length = ntohs(lsah->length) - OSPF_LSA_HEADER_SIZE;
1283 sum = 0;
1284 for (tlvh = TLV_HDR_TOP(lsah); (sum < length) && (tlvh != NULL);
1285 tlvh = TLV_HDR_NEXT(tlvh)) {
1286 if (ntohs(tlvh->type) == EXT_TLV_LINK) {
1287 /* Got Extended Link information */
1288 srl = get_ext_link_sid(tlvh);
1289 /* Update SID if not null */
1290 if (srl != NULL) {
1291 srl->instance = ntohl(lsah->id.s_addr);
1292 update_ext_link_sid(srn, srl, lsa->flags);
1293 }
1294 }
1295 sum += TLV_SIZE(tlvh);
1296 }
1297 }
1298
1299 /* Delete Segment Routing from Extended Link LSA */
1300 void ospf_sr_ext_link_lsa_delete(struct ospf_lsa *lsa)
1301 {
1302 struct listnode *node;
1303 struct sr_link *srl;
1304 struct sr_node *srn;
1305 struct lsa_header *lsah = (struct lsa_header *)lsa->data;
1306 uint32_t instance = ntohl(lsah->id.s_addr);
1307
1308 if (IS_DEBUG_OSPF_SR)
1309 zlog_debug("SR (%s): Remove Extended Link LSA 8.0.0.%u from %s",
1310 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1311 inet_ntoa(lsah->adv_router));
1312
1313 /* Sanity check */
1314 if (OspfSR.neighbors == NULL) {
1315 flog_err(OSPF_ERR_SR_INVALID_DB,
1316 "SR (%s): Abort! no valid SR DataBase", __func__);
1317 return;
1318 }
1319
1320 /* Search SR Node in hash table from Router ID */
1321 srn = (struct sr_node *)hash_lookup(OspfSR.neighbors,
1322 (void *)&(lsah->adv_router));
1323
1324 /*
1325 * SR-Node may be NULL if it has been remove previously when
1326 * processing Router Information LSA deletion
1327 */
1328 if (srn == NULL) {
1329 zlog_warn("SR (%s): Stop! no entry in SRDB for SR Node %s",
1330 __func__, inet_ntoa(lsah->adv_router));
1331 return;
1332 }
1333
1334 /* Search for corresponding Segment Link */
1335 for (ALL_LIST_ELEMENTS_RO(srn->ext_link, node, srl))
1336 if (srl->instance == instance)
1337 break;
1338
1339 /* Remove Segment Link if found */
1340 if ((srl != NULL) && (srl->instance == instance)) {
1341 del_sid_nhlfe(srl->nhlfe[0]);
1342 del_sid_nhlfe(srl->nhlfe[1]);
1343 listnode_delete(srn->ext_link, srl);
1344 XFREE(MTYPE_OSPF_SR_PARAMS, srl);
1345 } else {
1346 zlog_warn(
1347 "SR (%s): Didn't found corresponding SR Link 8.0.0.%u "
1348 "for SR Node %s",
1349 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1350 inet_ntoa(lsah->adv_router));
1351 }
1352 }
1353
1354 /* Update Segment Routing from Extended Prefix LSA */
1355 void ospf_sr_ext_prefix_lsa_update(struct ospf_lsa *lsa)
1356 {
1357 struct sr_node *srn;
1358 struct tlv_header *tlvh;
1359 struct lsa_header *lsah = (struct lsa_header *)lsa->data;
1360 struct sr_prefix *srp;
1361
1362 uint16_t length, sum;
1363
1364 if (IS_DEBUG_OSPF_SR)
1365 zlog_debug(
1366 "SR (%s): Process Extended Prefix LSA "
1367 "7.0.0.%u from %s",
1368 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1369 inet_ntoa(lsah->adv_router));
1370
1371 /* Sanity check */
1372 if (OspfSR.neighbors == NULL) {
1373 flog_err(OSPF_ERR_SR_INVALID_DB,
1374 "SR (%s): Abort! no valid SR DataBase", __func__);
1375 return;
1376 }
1377
1378 /* Get SR Node in hash table from Router ID */
1379 srn = (struct sr_node *)hash_get(OspfSR.neighbors,
1380 (void *)&(lsah->adv_router),
1381 (void *)sr_node_new);
1382
1383 /* Sanity check */
1384 if (srn == NULL) {
1385 flog_err(OSPF_ERR_SR_NODE_CREATE,
1386 "SR (%s): Abort! can't create SR node in hash table",
1387 __func__);
1388 return;
1389 }
1390
1391 /* Initialize TLV browsing */
1392 length = ntohs(lsah->length) - OSPF_LSA_HEADER_SIZE;
1393 sum = 0;
1394 for (tlvh = TLV_HDR_TOP(lsah); sum < length;
1395 tlvh = TLV_HDR_NEXT(tlvh)) {
1396 if (ntohs(tlvh->type) == EXT_TLV_LINK) {
1397 /* Got Extended Link information */
1398 srp = get_ext_prefix_sid(tlvh);
1399 /* Update SID if not null */
1400 if (srp != NULL) {
1401 srp->instance = ntohl(lsah->id.s_addr);
1402 update_ext_prefix_sid(srn, srp);
1403 }
1404 }
1405 sum += TLV_SIZE(tlvh);
1406 }
1407 }
1408
1409 /* Delete Segment Routing from Extended Prefix LSA */
1410 void ospf_sr_ext_prefix_lsa_delete(struct ospf_lsa *lsa)
1411 {
1412 struct listnode *node;
1413 struct sr_prefix *srp;
1414 struct sr_node *srn;
1415 struct lsa_header *lsah = (struct lsa_header *)lsa->data;
1416 uint32_t instance = ntohl(lsah->id.s_addr);
1417
1418 if (IS_DEBUG_OSPF_SR)
1419 zlog_debug(
1420 "SR (%s): Remove Extended Prefix LSA 7.0.0.%u from %s",
1421 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1422 inet_ntoa(lsah->adv_router));
1423
1424 /* Sanity check */
1425 if (OspfSR.neighbors == NULL) {
1426 flog_err(OSPF_ERR_SR_INVALID_DB,
1427 "SR (%s): Abort! no valid SR DataBase", __func__);
1428 return;
1429 }
1430
1431 /* Search SR Node in hash table from Router ID */
1432 srn = (struct sr_node *)hash_lookup(OspfSR.neighbors,
1433 (void *)&(lsah->adv_router));
1434
1435 /*
1436 * SR-Node may be NULL if it has been remove previously when
1437 * processing Router Information LSA deletion
1438 */
1439 if (srn == NULL) {
1440 zlog_warn("SR (%s): Stop! no entry in SRDB for SR Node %s",
1441 __func__, inet_ntoa(lsah->adv_router));
1442 return;
1443 }
1444
1445 /* Search for corresponding Segment Link */
1446 for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp))
1447 if (srp->instance == instance)
1448 break;
1449
1450 /* Remove Segment Link if found */
1451 if ((srp != NULL) && (srp->instance == instance)) {
1452 del_sid_nhlfe(srp->nhlfe);
1453 listnode_delete(srn->ext_link, srp);
1454 XFREE(MTYPE_OSPF_SR_PARAMS, srp);
1455 } else {
1456 zlog_warn(
1457 "SR (%s): Didn't found corresponding SR Prefix "
1458 "7.0.0.%u for SR Node %s",
1459 __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)),
1460 inet_ntoa(lsah->adv_router));
1461 }
1462 }
1463
1464 /* Get Label for Extended Link SID */
1465 /* TODO: To be replace by Zebra Label Manager */
1466 uint32_t get_ext_link_label_value(void)
1467 {
1468 static uint32_t label = ADJ_SID_MIN - 1;
1469
1470 if (label < ADJ_SID_MAX)
1471 label += 1;
1472
1473 return label;
1474 }
1475
1476 /*
1477 * Update Prefix SID. Call by ospf_ext_pref_ism_change to
1478 * complete initial CLI command at startutp.
1479 *
1480 * @param ifp - Loopback interface
1481 * @param pref - Prefix address of this interface
1482 *
1483 * @return - void
1484 */
1485 void ospf_sr_update_prefix(struct interface *ifp, struct prefix *p)
1486 {
1487 struct listnode *node;
1488 struct sr_prefix *srp;
1489
1490 /* Sanity Check */
1491 if ((ifp == NULL) || (p == NULL))
1492 return;
1493
1494 /*
1495 * Search if there is a Segment Prefix that correspond to this
1496 * interface or prefix, and update it if found
1497 */
1498 for (ALL_LIST_ELEMENTS_RO(OspfSR.self->ext_prefix, node, srp)) {
1499 if ((srp->nhlfe.ifindex == ifp->ifindex)
1500 || ((IPV4_ADDR_SAME(&srp->nhlfe.prefv4.prefix,
1501 &p->u.prefix4))
1502 && (srp->nhlfe.prefv4.prefixlen == p->prefixlen))) {
1503
1504 /* Update Interface & Prefix info */
1505 srp->nhlfe.ifindex = ifp->ifindex;
1506 IPV4_ADDR_COPY(&srp->nhlfe.prefv4.prefix,
1507 &p->u.prefix4);
1508 srp->nhlfe.prefv4.prefixlen = p->prefixlen;
1509 srp->nhlfe.prefv4.family = p->family;
1510 IPV4_ADDR_COPY(&srp->nhlfe.nexthop, &p->u.prefix4);
1511
1512 /* OK. Let's Schedule Extended Prefix LSA */
1513 srp->instance = ospf_ext_schedule_prefix_index(
1514 ifp, srp->sid, &srp->nhlfe.prefv4, srp->flags);
1515
1516 /* Install NHLFE if NO-PHP is requested */
1517 if (CHECK_FLAG(srp->flags,
1518 EXT_SUBTLV_PREFIX_SID_NPFLG)) {
1519 srp->nhlfe.label_in = index2label(
1520 srp->sid, OspfSR.self->srgb);
1521 srp->nhlfe.label_out = MPLS_LABEL_IMPLICIT_NULL;
1522 add_sid_nhlfe(srp->nhlfe);
1523 }
1524 }
1525 }
1526 }
1527
1528 /*
1529 * Following functions are used to update MPLS LFIB after a SPF run
1530 */
1531
1532 static void ospf_sr_nhlfe_update(struct hash_backet *backet, void *args)
1533 {
1534
1535 struct sr_node *srn = (struct sr_node *)backet->data;
1536 struct listnode *node;
1537 struct sr_prefix *srp;
1538 struct sr_nhlfe old;
1539 int rc;
1540
1541 if (IS_DEBUG_OSPF_SR)
1542 zlog_debug(" |- Update Prefix for SR Node %s",
1543 inet_ntoa(srn->adv_router));
1544
1545 /* Skip Self SR Node */
1546 if (srn == OspfSR.self)
1547 return;
1548
1549 /* Update Extended Prefix */
1550 for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp)) {
1551
1552 /* Backup current NHLFE */
1553 memcpy(&old, &srp->nhlfe, sizeof(struct sr_nhlfe));
1554
1555 /* Compute the new NHLFE */
1556 rc = compute_prefix_nhlfe(srp);
1557
1558 /* Check computation result */
1559 switch (rc) {
1560 /* next hop is not know, remove old NHLFE to avoid loop */
1561 case -1:
1562 del_sid_nhlfe(srp->nhlfe);
1563 break;
1564 /* next hop has not changed, skip it */
1565 case 0:
1566 break;
1567 /* there is a new next hop, update NHLFE */
1568 case 1:
1569 update_sid_nhlfe(old, srp->nhlfe);
1570 break;
1571 default:
1572 break;
1573 }
1574 }
1575 }
1576
1577 static int ospf_sr_update_schedule(struct thread *t)
1578 {
1579
1580 struct ospf *ospf;
1581 struct timeval start_time, stop_time;
1582
1583 ospf = THREAD_ARG(t);
1584 ospf->t_sr_update = NULL;
1585
1586 if (!OspfSR.update)
1587 return 0;
1588
1589 monotime(&start_time);
1590
1591 if (IS_DEBUG_OSPF_SR)
1592 zlog_debug("SR (%s): Start SPF update", __func__);
1593
1594 hash_iterate(OspfSR.neighbors, (void (*)(struct hash_backet *,
1595 void *))ospf_sr_nhlfe_update,
1596 NULL);
1597
1598 monotime(&stop_time);
1599
1600 if (IS_DEBUG_OSPF_SR)
1601 zlog_debug("SR (%s): SPF Processing Time(usecs): %lld\n",
1602 __func__,
1603 (stop_time.tv_sec - start_time.tv_sec) * 1000000LL
1604 + (stop_time.tv_usec - start_time.tv_usec));
1605
1606 OspfSR.update = false;
1607 return 1;
1608 }
1609
1610 #define OSPF_SR_UPDATE_INTERVAL 1
1611
1612 void ospf_sr_update_timer_add(struct ospf *ospf)
1613 {
1614
1615 if (ospf == NULL)
1616 return;
1617
1618 /* Check if an update is not alreday engage */
1619 if (OspfSR.update)
1620 return;
1621
1622 OspfSR.update = true;
1623
1624 thread_add_timer(master, ospf_sr_update_schedule, ospf,
1625 OSPF_SR_UPDATE_INTERVAL, &ospf->t_sr_update);
1626 }
1627
1628 /*
1629 * --------------------------------------
1630 * Followings are vty command functions.
1631 * --------------------------------------
1632 */
1633
1634 /*
1635 * Segment Routing Router configuration
1636 *
1637 * Must be centralize as it concerns both Extended Link/Prefix LSA
1638 * and Router Information LSA. Choose to call it from Extended Prefix
1639 * write_config() call back.
1640 *
1641 * @param vty VTY output
1642 *
1643 * @return none
1644 */
1645 void ospf_sr_config_write_router(struct vty *vty)
1646 {
1647 struct listnode *node;
1648 struct sr_prefix *srp;
1649
1650 if (OspfSR.enabled) {
1651 vty_out(vty, " segment-routing on\n");
1652
1653 if ((OspfSR.srgb.lower_bound != MPLS_DEFAULT_MIN_SRGB_LABEL)
1654 || (OspfSR.srgb.range_size != MPLS_DEFAULT_MAX_SRGB_SIZE)) {
1655 vty_out(vty, " segment-routing global-block %u %u\n",
1656 OspfSR.srgb.lower_bound,
1657 OspfSR.srgb.lower_bound + OspfSR.srgb.range_size
1658 - 1);
1659 }
1660 if (OspfSR.msd != 0)
1661 vty_out(vty, " segment-routing node-msd %u\n",
1662 OspfSR.msd);
1663
1664 if (OspfSR.self != NULL) {
1665 for (ALL_LIST_ELEMENTS_RO(OspfSR.self->ext_prefix, node,
1666 srp)) {
1667 vty_out(vty,
1668 " segment-routing prefix %s/%u "
1669 "index %u%s\n",
1670 inet_ntoa(srp->nhlfe.prefv4.prefix),
1671 srp->nhlfe.prefv4.prefixlen, srp->sid,
1672 CHECK_FLAG(srp->flags,
1673 EXT_SUBTLV_PREFIX_SID_NPFLG)
1674 ? " no-php-flag"
1675 : "");
1676 }
1677 }
1678 }
1679 }
1680
1681 DEFUN(ospf_sr_enable,
1682 ospf_sr_enable_cmd,
1683 "segment-routing on",
1684 SR_STR
1685 "Enable Segment Routing\n")
1686 {
1687
1688 VTY_DECLVAR_INSTANCE_CONTEXT(ospf, ospf);
1689
1690 if (OspfSR.enabled)
1691 return CMD_SUCCESS;
1692
1693 if (ospf->vrf_id != VRF_DEFAULT) {
1694 vty_out(vty,
1695 "Segment Routing is only supported in default "
1696 "VRF\n");
1697 return CMD_WARNING_CONFIG_FAILED;
1698 }
1699
1700 if (IS_DEBUG_OSPF_EVENT)
1701 zlog_debug("SR: Segment Routing: OFF -> ON");
1702
1703 /* Start Segment Routing */
1704 OspfSR.enabled = true;
1705 if (!ospf_sr_start(ospf)) {
1706 zlog_warn("SR: Unable to start Segment Routing. Abort!");
1707 return CMD_WARNING;
1708 }
1709
1710 /* Set Router Information SR parameters */
1711 if (IS_DEBUG_OSPF_EVENT)
1712 zlog_debug("SR: Activate SR for Router Information LSA");
1713
1714 ospf_router_info_update_sr(true, OspfSR.srgb, OspfSR.msd);
1715
1716 /* Update Ext LSA */
1717 if (IS_DEBUG_OSPF_EVENT)
1718 zlog_debug("SR: Activate SR for Extended Link/Prefix LSA");
1719
1720 ospf_ext_update_sr(true);
1721
1722 return CMD_SUCCESS;
1723 }
1724
1725 DEFUN (no_ospf_sr_enable,
1726 no_ospf_sr_enable_cmd,
1727 "no segment-routing [on]",
1728 NO_STR
1729 SR_STR
1730 "Disable Segment Routing\n")
1731 {
1732
1733 if (!OspfSR.enabled)
1734 return CMD_SUCCESS;
1735
1736 if (IS_DEBUG_OSPF_EVENT)
1737 zlog_debug("SR: Segment Routing: ON -> OFF");
1738
1739 /* Start by Disabling Extended Link & Prefix LSA */
1740 ospf_ext_update_sr(false);
1741
1742 /* then, disable Router Information SR parameters */
1743 ospf_router_info_update_sr(false, OspfSR.srgb, OspfSR.msd);
1744
1745 /* Finally, stop Segment Routing */
1746 ospf_sr_stop();
1747 OspfSR.enabled = false;
1748
1749 return CMD_SUCCESS;
1750 }
1751
1752 static int ospf_sr_enabled(struct vty *vty)
1753 {
1754 if (OspfSR.enabled)
1755 return 1;
1756
1757 if (vty)
1758 vty_out(vty, "%% OSPF SR is not turned on\n");
1759
1760 return 0;
1761 }
1762
1763 DEFUN (sr_sid_label_range,
1764 sr_sid_label_range_cmd,
1765 "segment-routing global-block (0-1048575) (0-1048575)",
1766 SR_STR
1767 "Segment Routing Global Block label range\n"
1768 "Lower-bound range in decimal (0-1048575)\n"
1769 "Upper-bound range in decimal (0-1048575)\n")
1770 {
1771 uint32_t upper;
1772 uint32_t lower;
1773 uint32_t size;
1774 int idx_low = 2;
1775 int idx_up = 3;
1776
1777 if (!ospf_sr_enabled(vty))
1778 return CMD_WARNING_CONFIG_FAILED;
1779
1780 /* Get lower and upper bound */
1781 lower = strtoul(argv[idx_low]->arg, NULL, 10);
1782 upper = strtoul(argv[idx_up]->arg, NULL, 10);
1783 size = upper - lower + 1;
1784
1785 if (size > MPLS_DEFAULT_MAX_SRGB_SIZE || size <= 0) {
1786 vty_out(vty,
1787 "Range size cannot be less than 0 or more than %u\n",
1788 MPLS_DEFAULT_MAX_SRGB_SIZE);
1789 return CMD_WARNING_CONFIG_FAILED;
1790 }
1791
1792 if (upper > MPLS_DEFAULT_MAX_SRGB_LABEL) {
1793 vty_out(vty, "Upper-bound cannot exceed %u\n",
1794 MPLS_DEFAULT_MAX_SRGB_LABEL);
1795 return CMD_WARNING_CONFIG_FAILED;
1796 }
1797
1798 if (upper < MPLS_DEFAULT_MIN_SRGB_LABEL) {
1799 vty_out(vty, "Upper-bound cannot be lower than %u\n",
1800 MPLS_DEFAULT_MIN_SRGB_LABEL);
1801 return CMD_WARNING_CONFIG_FAILED;
1802 }
1803
1804 /* Check if values have changed */
1805 if ((OspfSR.srgb.range_size == size)
1806 && (OspfSR.srgb.lower_bound == lower))
1807 return CMD_SUCCESS;
1808
1809 /* Set SID/Label range SRGB */
1810 OspfSR.srgb.range_size = size;
1811 OspfSR.srgb.lower_bound = lower;
1812 if (OspfSR.self != NULL) {
1813 OspfSR.self->srgb.range_size = size;
1814 OspfSR.self->srgb.lower_bound = lower;
1815 }
1816
1817 /* Set Router Information SR parameters */
1818 ospf_router_info_update_sr(true, OspfSR.srgb, OspfSR.msd);
1819
1820 /* Update NHLFE entries */
1821 hash_iterate(OspfSR.neighbors,
1822 (void (*)(struct hash_backet *, void *))update_in_nhlfe,
1823 NULL);
1824
1825 return CMD_SUCCESS;
1826 }
1827
1828 DEFUN (no_sr_sid_label_range,
1829 no_sr_sid_label_range_cmd,
1830 "no segment-routing global-block [(0-1048575) (0-1048575)]",
1831 NO_STR
1832 SR_STR
1833 "Segment Routing Global Block label range\n"
1834 "Lower-bound range in decimal (0-1048575)\n"
1835 "Upper-bound range in decimal (0-1048575)\n")
1836 {
1837
1838 if (!ospf_sr_enabled(vty))
1839 return CMD_WARNING_CONFIG_FAILED;
1840
1841 /* Revert to default SRGB value */
1842 OspfSR.srgb.range_size = MPLS_DEFAULT_MIN_SRGB_SIZE;
1843 OspfSR.srgb.lower_bound = MPLS_DEFAULT_MIN_SRGB_LABEL;
1844 if (OspfSR.self != NULL) {
1845 OspfSR.self->srgb.range_size = OspfSR.srgb.range_size;
1846 OspfSR.self->srgb.lower_bound = OspfSR.srgb.lower_bound;
1847 }
1848
1849 /* Set Router Information SR parameters */
1850 ospf_router_info_update_sr(true, OspfSR.srgb, OspfSR.msd);
1851
1852 /* Update NHLFE entries */
1853 hash_iterate(OspfSR.neighbors,
1854 (void (*)(struct hash_backet *, void *))update_in_nhlfe,
1855 NULL);
1856
1857 return CMD_SUCCESS;
1858 }
1859
1860 DEFUN (sr_node_msd,
1861 sr_node_msd_cmd,
1862 "segment-routing node-msd (1-16)",
1863 SR_STR
1864 "Maximum Stack Depth for this router\n"
1865 "Maximum number of label that could be stack (1-16)\n")
1866 {
1867 uint32_t msd;
1868 int idx = 1;
1869
1870 if (!ospf_sr_enabled(vty))
1871 return CMD_WARNING_CONFIG_FAILED;
1872
1873 /* Get MSD */
1874 argv_find(argv, argc, "(1-16)", &idx);
1875 msd = strtoul(argv[idx]->arg, NULL, 10);
1876 if (msd < 1 || msd > MPLS_MAX_LABELS) {
1877 vty_out(vty, "MSD must be comprise between 1 and %u\n",
1878 MPLS_MAX_LABELS);
1879 return CMD_WARNING_CONFIG_FAILED;
1880 }
1881
1882 /* Check if value has changed */
1883 if (OspfSR.msd == msd)
1884 return CMD_SUCCESS;
1885
1886 /* Set this router MSD */
1887 OspfSR.msd = msd;
1888 if (OspfSR.self != NULL)
1889 OspfSR.self->msd = msd;
1890
1891 /* Set Router Information SR parameters */
1892 ospf_router_info_update_sr(true, OspfSR.srgb, OspfSR.msd);
1893
1894 return CMD_SUCCESS;
1895 }
1896
1897 DEFUN (no_sr_node_msd,
1898 no_sr_node_msd_cmd,
1899 "no segment-routing node-msd [(1-16)]",
1900 NO_STR
1901 SR_STR
1902 "Maximum Stack Depth for this router\n"
1903 "Maximum number of label that could be stack (1-16)\n")
1904 {
1905
1906 if (!ospf_sr_enabled(vty))
1907 return CMD_WARNING_CONFIG_FAILED;
1908
1909 /* unset this router MSD */
1910 OspfSR.msd = 0;
1911 if (OspfSR.self != NULL)
1912 OspfSR.self->msd = 0;
1913
1914 /* Set Router Information SR parameters */
1915 ospf_router_info_update_sr(true, OspfSR.srgb, 0);
1916
1917 return CMD_SUCCESS;
1918 }
1919
1920 DEFUN (sr_prefix_sid,
1921 sr_prefix_sid_cmd,
1922 "segment-routing prefix A.B.C.D/M index (0-65535) [no-php-flag]",
1923 SR_STR
1924 "Prefix SID\n"
1925 "IPv4 Prefix as A.B.C.D/M\n"
1926 "SID index for this prefix in decimal (0-65535)\n"
1927 "Index value inside SRGB (lower_bound < index < upper_bound)\n"
1928 "Don't request Penultimate Hop Popping (PHP)\n")
1929 {
1930 int idx = 0;
1931 struct prefix p;
1932 uint32_t index;
1933 struct listnode *node;
1934 struct sr_prefix *srp, *new;
1935 struct interface *ifp;
1936
1937 if (!ospf_sr_enabled(vty))
1938 return CMD_WARNING_CONFIG_FAILED;
1939
1940 /* Get network prefix */
1941 argv_find(argv, argc, "A.B.C.D/M", &idx);
1942 if (!str2prefix(argv[idx]->arg, &p)) {
1943 vty_out(vty, "Invalid prefix format %s\n", argv[idx]->arg);
1944 return CMD_WARNING_CONFIG_FAILED;
1945 }
1946
1947 /* Get & verify index value */
1948 argv_find(argv, argc, "(0-65535)", &idx);
1949 index = strtoul(argv[idx]->arg, NULL, 10);
1950 if (index > OspfSR.srgb.range_size - 1) {
1951 vty_out(vty, "Index %u must be lower than range size %u\n",
1952 index, OspfSR.srgb.range_size);
1953 return CMD_WARNING_CONFIG_FAILED;
1954 }
1955
1956 /* check that the index is not already used */
1957 for (ALL_LIST_ELEMENTS_RO(OspfSR.self->ext_prefix, node, srp)) {
1958 if (srp->sid == index) {
1959 vty_out(vty, "Index %u is already used\n", index);
1960 return CMD_WARNING_CONFIG_FAILED;
1961 }
1962 }
1963
1964 /* Create new Extended Prefix to SRDB if not found */
1965 new = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_prefix));
1966 IPV4_ADDR_COPY(&new->nhlfe.prefv4.prefix, &p.u.prefix4);
1967 IPV4_ADDR_COPY(&new->nhlfe.nexthop, &p.u.prefix4);
1968 new->nhlfe.prefv4.prefixlen = p.prefixlen;
1969 new->nhlfe.prefv4.family = p.family;
1970 new->sid = index;
1971 /* Set NO PHP flag if present and compute NHLFE */
1972 if (argv_find(argv, argc, "no-php-flag", &idx)) {
1973 SET_FLAG(new->flags, EXT_SUBTLV_PREFIX_SID_NPFLG);
1974 new->nhlfe.label_in = index2label(new->sid, OspfSR.self->srgb);
1975 new->nhlfe.label_out = MPLS_LABEL_IMPLICIT_NULL;
1976 }
1977
1978 if (IS_DEBUG_OSPF_SR)
1979 zlog_debug("SR (%s): Add new index %u to Prefix %s/%u",
1980 __func__, index, inet_ntoa(new->nhlfe.prefv4.prefix),
1981 new->nhlfe.prefv4.prefixlen);
1982
1983 /* Get Interface and check if it is a Loopback */
1984 ifp = if_lookup_prefix(&p, VRF_DEFAULT);
1985 if (ifp == NULL) {
1986 /*
1987 * Interface could be not yet available i.e. when this
1988 * command is in the configuration file, OSPF is not yet
1989 * ready. In this case, store the prefix SID for latter
1990 * update of this Extended Prefix
1991 */
1992 listnode_add(OspfSR.self->ext_prefix, new);
1993 zlog_warn(
1994 "Interface for prefix %s/%u not found. Deferred LSA "
1995 "flooding",
1996 inet_ntoa(p.u.prefix4), p.prefixlen);
1997 return CMD_SUCCESS;
1998 }
1999
2000 if (!if_is_loopback(ifp)) {
2001 vty_out(vty, "interface %s is not a Loopback\n", ifp->name);
2002 XFREE(MTYPE_OSPF_SR_PARAMS, new);
2003 return CMD_WARNING_CONFIG_FAILED;
2004 }
2005 new->nhlfe.ifindex = ifp->ifindex;
2006
2007 /* Search if this prefix already exist */
2008 for (ALL_LIST_ELEMENTS_RO(OspfSR.self->ext_prefix, node, srp)) {
2009 if ((IPV4_ADDR_SAME(&srp->nhlfe.prefv4.prefix, &p.u.prefix4)
2010 && srp->nhlfe.prefv4.prefixlen == p.prefixlen))
2011 break;
2012 else
2013 srp = NULL;
2014 }
2015
2016 /* Update or Add this new SR Prefix */
2017 if (srp) {
2018 update_sid_nhlfe(srp->nhlfe, new->nhlfe);
2019 listnode_delete(OspfSR.self->ext_prefix, srp);
2020 listnode_add(OspfSR.self->ext_prefix, new);
2021 } else {
2022 listnode_add(OspfSR.self->ext_prefix, new);
2023 add_sid_nhlfe(new->nhlfe);
2024 }
2025
2026 /* Finally, update Extended Prefix LSA */
2027 new->instance = ospf_ext_schedule_prefix_index(
2028 ifp, new->sid, &new->nhlfe.prefv4, new->flags);
2029 if (new->instance == 0) {
2030 vty_out(vty, "Unable to set index %u for prefix %s/%u\n", index,
2031 inet_ntoa(p.u.prefix4), p.prefixlen);
2032 return CMD_WARNING;
2033 }
2034
2035 return CMD_SUCCESS;
2036 }
2037
2038 DEFUN (no_sr_prefix_sid,
2039 no_sr_prefix_sid_cmd,
2040 "no segment-routing prefix A.B.C.D/M [index (0-65535) no-php-flag]",
2041 NO_STR
2042 SR_STR
2043 "Prefix SID\n"
2044 "IPv4 Prefix as A.B.C.D/M\n"
2045 "SID index for this prefix in decimal (0-65535)\n"
2046 "Index value inside SRGB (lower_bound < index < upper_bound)\n"
2047 "Don't request Penultimate Hop Popping (PHP)\n")
2048 {
2049 int idx = 0;
2050 struct prefix p;
2051 struct listnode *node;
2052 struct sr_prefix *srp;
2053 struct interface *ifp;
2054 bool found = false;
2055 int rc;
2056
2057 /* Get network prefix */
2058 argv_find(argv, argc, "A.B.C.D/M", &idx);
2059 rc = str2prefix(argv[idx]->arg, &p);
2060 if (!rc) {
2061 vty_out(vty, "Invalid prefix format %s\n", argv[idx]->arg);
2062 return CMD_WARNING_CONFIG_FAILED;
2063 }
2064
2065 /* check that the prefix is already set */
2066 for (ALL_LIST_ELEMENTS_RO(OspfSR.self->ext_prefix, node, srp))
2067 if (IPV4_ADDR_SAME(&srp->nhlfe.prefv4.prefix, &p.u.prefix4)
2068 && (srp->nhlfe.prefv4.prefixlen == p.prefixlen)) {
2069 found = true;
2070 break;
2071 }
2072
2073 if (!found) {
2074 vty_out(vty, "Prefix %s is not found. Abort!\n",
2075 argv[idx]->arg);
2076 return CMD_WARNING_CONFIG_FAILED;
2077 }
2078
2079 /* Get Interface */
2080 ifp = if_lookup_by_index(srp->nhlfe.ifindex, VRF_DEFAULT);
2081 if (ifp == NULL) {
2082 vty_out(vty, "interface for prefix %s not found.\n",
2083 argv[idx]->arg);
2084 return CMD_WARNING_CONFIG_FAILED;
2085 }
2086
2087 /* Update Extended Prefix LSA */
2088 if (!ospf_ext_schedule_prefix_index(ifp, 0, NULL, 0)) {
2089 vty_out(vty, "No corresponding loopback interface. Abort!\n");
2090 return CMD_WARNING;
2091 }
2092
2093 if (IS_DEBUG_OSPF_SR)
2094 zlog_debug("SR (%s): Remove Prefix %s/%u with index %u",
2095 __func__, inet_ntoa(srp->nhlfe.prefv4.prefix),
2096 srp->nhlfe.prefv4.prefixlen, srp->sid);
2097
2098 /* Delete NHLFE is NO-PHP is set */
2099 if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_NPFLG))
2100 del_sid_nhlfe(srp->nhlfe);
2101
2102 /* OK, all is clean, remove SRP from SRDB */
2103 listnode_delete(OspfSR.self->ext_prefix, srp);
2104 XFREE(MTYPE_OSPF_SR_PARAMS, srp);
2105
2106 return CMD_SUCCESS;
2107 }
2108
2109
2110 static void show_sr_node(struct vty *vty, struct json_object *json,
2111 struct sr_node *srn)
2112 {
2113
2114 struct listnode *node;
2115 struct sr_link *srl;
2116 struct sr_prefix *srp;
2117 struct interface *itf;
2118 char pref[19];
2119 char sid[22];
2120 char label[8];
2121 json_object *json_node = NULL, *json_algo, *json_obj;
2122 json_object *json_prefix = NULL, *json_link = NULL;
2123
2124 /* Sanity Check */
2125 if (srn == NULL)
2126 return;
2127
2128 if (json) {
2129 json_node = json_object_new_object();
2130 json_object_string_add(json_node, "routerID",
2131 inet_ntoa(srn->adv_router));
2132 json_object_int_add(json_node, "srgbSize",
2133 srn->srgb.range_size);
2134 json_object_int_add(json_node, "srgbLabel",
2135 srn->srgb.lower_bound);
2136 json_algo = json_object_new_array();
2137 json_object_object_add(json_node, "algorithms", json_algo);
2138 for (int i = 0; i < ALGORITHM_COUNT; i++) {
2139 if (srn->algo[i] == SR_ALGORITHM_UNSET)
2140 continue;
2141 json_obj = json_object_new_object();
2142 char tmp[2];
2143
2144 snprintf(tmp, 2, "%u", i);
2145 json_object_string_add(json_obj, tmp,
2146 srn->algo[i] == SR_ALGORITHM_SPF
2147 ? "SPF"
2148 : "S-SPF");
2149 json_object_array_add(json_algo, json_obj);
2150 }
2151 if (srn->msd != 0)
2152 json_object_int_add(json_node, "nodeMsd", srn->msd);
2153 } else {
2154 vty_out(vty, "SR-Node: %s", inet_ntoa(srn->adv_router));
2155 vty_out(vty, "\tSRGB (Size/Label): %u/%u", srn->srgb.range_size,
2156 srn->srgb.lower_bound);
2157 vty_out(vty, "\tAlgorithm(s): %s",
2158 srn->algo[0] == SR_ALGORITHM_SPF ? "SPF" : "S-SPF");
2159 for (int i = 1; i < ALGORITHM_COUNT; i++) {
2160 if (srn->algo[i] == SR_ALGORITHM_UNSET)
2161 continue;
2162 vty_out(vty, "/%s",
2163 srn->algo[i] == SR_ALGORITHM_SPF ? "SPF"
2164 : "S-SPF");
2165 }
2166 if (srn->msd != 0)
2167 vty_out(vty, "\tMSD: %u", srn->msd);
2168 }
2169
2170 if (!json) {
2171 vty_out(vty,
2172 "\n\n Prefix or Link Label In Label Out "
2173 "Node or Adj. SID Interface Nexthop\n");
2174 vty_out(vty,
2175 "------------------ -------- --------- "
2176 "--------------------- --------- ---------------\n");
2177 }
2178 for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp)) {
2179 snprintf(pref, 19, "%s/%u", inet_ntoa(srp->nhlfe.prefv4.prefix),
2180 srp->nhlfe.prefv4.prefixlen);
2181 snprintf(sid, 22, "SR Pfx (idx %u)", srp->sid);
2182 if (srp->nhlfe.label_out == MPLS_LABEL_IMPLICIT_NULL)
2183 sprintf(label, "pop");
2184 else
2185 sprintf(label, "%u", srp->nhlfe.label_out);
2186 itf = if_lookup_by_index(srp->nhlfe.ifindex, VRF_DEFAULT);
2187 if (json) {
2188 if (!json_prefix) {
2189 json_prefix = json_object_new_array();
2190 json_object_object_add(json_node,
2191 "extendedPrefix",
2192 json_prefix);
2193 }
2194 json_obj = json_object_new_object();
2195 json_object_string_add(json_obj, "prefix", pref);
2196 json_object_int_add(json_obj, "sid", srp->sid);
2197 json_object_int_add(json_obj, "inputLabel",
2198 srp->nhlfe.label_in);
2199 json_object_string_add(json_obj, "outputLabel", label);
2200 json_object_string_add(json_obj, "interface",
2201 itf ? itf->name : "-");
2202 json_object_string_add(json_obj, "nexthop",
2203 inet_ntoa(srp->nhlfe.nexthop));
2204 json_object_array_add(json_prefix, json_obj);
2205 } else {
2206 vty_out(vty, "%18s %8u %9s %21s %9s %15s\n", pref,
2207 srp->nhlfe.label_in, label, sid,
2208 itf ? itf->name : "-",
2209 inet_ntoa(srp->nhlfe.nexthop));
2210 }
2211 }
2212
2213 for (ALL_LIST_ELEMENTS_RO(srn->ext_link, node, srl)) {
2214 snprintf(pref, 19, "%s/%u",
2215 inet_ntoa(srl->nhlfe[0].prefv4.prefix),
2216 srl->nhlfe[0].prefv4.prefixlen);
2217 snprintf(sid, 22, "SR Adj. (lbl %u)", srl->sid[0]);
2218 if (srl->nhlfe[0].label_out == MPLS_LABEL_IMPLICIT_NULL)
2219 sprintf(label, "pop");
2220 else
2221 sprintf(label, "%u", srl->nhlfe[0].label_out);
2222 itf = if_lookup_by_index(srl->nhlfe[0].ifindex, VRF_DEFAULT);
2223 if (json) {
2224 if (!json_link) {
2225 json_link = json_object_new_array();
2226 json_object_object_add(
2227 json_node, "extendedLink", json_link);
2228 }
2229 /* Primary Link */
2230 json_obj = json_object_new_object();
2231 json_object_string_add(json_obj, "prefix", pref);
2232 json_object_int_add(json_obj, "sid", srl->sid[0]);
2233 json_object_int_add(json_obj, "inputLabel",
2234 srl->nhlfe[0].label_in);
2235 json_object_string_add(json_obj, "outputLabel", label);
2236 json_object_string_add(json_obj, "interface",
2237 itf ? itf->name : "-");
2238 json_object_string_add(
2239 json_obj, "nexthop",
2240 inet_ntoa(srl->nhlfe[0].nexthop));
2241 json_object_array_add(json_link, json_obj);
2242 /* Backup Link */
2243 json_obj = json_object_new_object();
2244 snprintf(sid, 22, "SR Adj. (lbl %u)", srl->sid[1]);
2245 if (srl->nhlfe[1].label_out == MPLS_LABEL_IMPLICIT_NULL)
2246 sprintf(label, "pop");
2247 else
2248 sprintf(label, "%u", srl->nhlfe[0].label_out);
2249 json_object_string_add(json_obj, "prefix", pref);
2250 json_object_int_add(json_obj, "sid", srl->sid[1]);
2251 json_object_int_add(json_obj, "inputLabel",
2252 srl->nhlfe[1].label_in);
2253 json_object_string_add(json_obj, "outputLabel", label);
2254 json_object_string_add(json_obj, "interface",
2255 itf ? itf->name : "-");
2256 json_object_string_add(
2257 json_obj, "nexthop",
2258 inet_ntoa(srl->nhlfe[1].nexthop));
2259 json_object_array_add(json_link, json_obj);
2260 } else {
2261 vty_out(vty, "%18s %8u %9s %21s %9s %15s\n", pref,
2262 srl->nhlfe[0].label_in, label, sid,
2263 itf ? itf->name : "-",
2264 inet_ntoa(srl->nhlfe[0].nexthop));
2265 snprintf(sid, 22, "SR Adj. (lbl %u)", srl->sid[1]);
2266 if (srl->nhlfe[1].label_out == MPLS_LABEL_IMPLICIT_NULL)
2267 sprintf(label, "pop");
2268 else
2269 sprintf(label, "%u", srl->nhlfe[1].label_out);
2270 vty_out(vty, "%18s %8u %9s %21s %9s %15s\n", pref,
2271 srl->nhlfe[1].label_in, label, sid,
2272 itf ? itf->name : "-",
2273 inet_ntoa(srl->nhlfe[1].nexthop));
2274 }
2275 }
2276 if (json)
2277 json_object_array_add(json, json_node);
2278 else
2279 vty_out(vty, "\n");
2280 }
2281
2282 static void show_vty_srdb(struct hash_backet *backet, void *args)
2283 {
2284 struct vty *vty = (struct vty *)args;
2285 struct sr_node *srn = (struct sr_node *)backet->data;
2286
2287 show_sr_node(vty, NULL, srn);
2288 }
2289
2290 static void show_json_srdb(struct hash_backet *backet, void *args)
2291 {
2292 struct json_object *json = (struct json_object *)args;
2293 struct sr_node *srn = (struct sr_node *)backet->data;
2294
2295 show_sr_node(NULL, json, srn);
2296 }
2297
2298 DEFUN (show_ip_opsf_srdb,
2299 show_ip_ospf_srdb_cmd,
2300 "show ip ospf database segment-routing [adv-router A.B.C.D|self-originate] [json]",
2301 SHOW_STR
2302 IP_STR
2303 OSPF_STR
2304 "Database summary\n"
2305 "Show Segment Routing Data Base\n"
2306 "Advertising SR node\n"
2307 "Advertising SR node ID (as an IP address)\n"
2308 "Self-originated SR node\n"
2309 JSON_STR)
2310 {
2311 int idx = 0;
2312 struct in_addr rid;
2313 struct sr_node *srn;
2314 uint8_t uj = use_json(argc, argv);
2315 json_object *json = NULL, *json_node_array = NULL;
2316
2317 if (!OspfSR.enabled) {
2318 vty_out(vty, "Segment Routing is disabled on this router\n");
2319 return CMD_WARNING;
2320 }
2321
2322 if (uj) {
2323 json = json_object_new_object();
2324 json_node_array = json_object_new_array();
2325 json_object_string_add(json, "srdbID",
2326 inet_ntoa(OspfSR.self->adv_router));
2327 json_object_object_add(json, "srNodes", json_node_array);
2328 } else {
2329 vty_out(vty,
2330 "\n\t\tOSPF Segment Routing database for ID %s\n\n",
2331 inet_ntoa(OspfSR.self->adv_router));
2332 }
2333
2334 if (argv_find(argv, argc, "self-originate", &idx)) {
2335 srn = OspfSR.self;
2336 show_sr_node(vty, json_node_array, srn);
2337 if (uj) {
2338 vty_out(vty, "%s\n",
2339 json_object_to_json_string_ext(
2340 json, JSON_C_TO_STRING_PRETTY));
2341 json_object_free(json);
2342 }
2343 return CMD_SUCCESS;
2344 }
2345
2346 if (argv_find(argv, argc, "A.B.C.D", &idx)) {
2347 if (!inet_aton(argv[idx]->arg, &rid)) {
2348 vty_out(vty, "Specified Router ID %s is invalid\n",
2349 argv[idx]->arg);
2350 return CMD_WARNING_CONFIG_FAILED;
2351 }
2352 /* Get the SR Node from the SRDB */
2353 srn = (struct sr_node *)hash_lookup(OspfSR.neighbors,
2354 (void *)&rid);
2355 show_sr_node(vty, json_node_array, srn);
2356 if (uj) {
2357 vty_out(vty, "%s\n",
2358 json_object_to_json_string_ext(
2359 json, JSON_C_TO_STRING_PRETTY));
2360 json_object_free(json);
2361 }
2362 return CMD_SUCCESS;
2363 }
2364
2365 /* No parameters have been provided, Iterate through all the SRDB */
2366 if (uj) {
2367 hash_iterate(OspfSR.neighbors, (void (*)(struct hash_backet *,
2368 void *))show_json_srdb,
2369 (void *)json_node_array);
2370 vty_out(vty, "%s\n", json_object_to_json_string_ext(
2371 json, JSON_C_TO_STRING_PRETTY));
2372 json_object_free(json);
2373 } else {
2374 hash_iterate(OspfSR.neighbors, (void (*)(struct hash_backet *,
2375 void *))show_vty_srdb,
2376 (void *)vty);
2377 }
2378 return CMD_SUCCESS;
2379 }
2380
2381 /* Install new CLI commands */
2382 void ospf_sr_register_vty(void)
2383 {
2384 install_element(VIEW_NODE, &show_ip_ospf_srdb_cmd);
2385
2386 install_element(OSPF_NODE, &ospf_sr_enable_cmd);
2387 install_element(OSPF_NODE, &no_ospf_sr_enable_cmd);
2388 install_element(OSPF_NODE, &sr_sid_label_range_cmd);
2389 install_element(OSPF_NODE, &no_sr_sid_label_range_cmd);
2390 install_element(OSPF_NODE, &sr_node_msd_cmd);
2391 install_element(OSPF_NODE, &no_sr_node_msd_cmd);
2392 install_element(OSPF_NODE, &sr_prefix_sid_cmd);
2393 install_element(OSPF_NODE, &no_sr_prefix_sid_cmd);
2394 }
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