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pimd: Instate partial rp_list(when its full) to bsrp_list(main list).
[mirror_frr.git] / pimd / pim_bsm.c
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361b5843 1/*
2 * pim_bsm.c: PIM BSM handling routines
3 *
4 * Copyright (C) 2018-19 Vmware, Inc.
5 * Saravanan K
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; see the file COPYING; if not, write to the
19 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
20 * MA 02110-1301 USA
21 */
22#include "if.h"
23#include "pimd.h"
24#include "pim_iface.h"
361b5843 25#include "pim_instance.h"
26#include "pim_rpf.h"
27#include "pim_hello.h"
28#include "pim_pim.h"
29#include "pim_nht.h"
30#include "pim_bsm.h"
31#include "pim_time.h"
32
33/* Functions forward declaration */
34static void pim_bs_timer_start(struct bsm_scope *scope, int bs_timeout);
a5164e97 35static void pim_g2rp_timer_start(struct bsm_rpinfo *bsrp, int hold_time);
36static inline void pim_g2rp_timer_restart(struct bsm_rpinfo *bsrp,
37 int hold_time);
23255dfd 38
39/* Memory Types */
40DEFINE_MTYPE_STATIC(PIMD, PIM_BSGRP_NODE, "PIM BSR advertised grp info")
41DEFINE_MTYPE_STATIC(PIMD, PIM_BSRP_NODE, "PIM BSR advertised RP info")
42DEFINE_MTYPE_STATIC(PIMD, PIM_BSM_INFO, "PIM BSM Info")
43DEFINE_MTYPE_STATIC(PIMD, PIM_BSM_PKT_VAR_MEM, "PIM BSM Packet")
361b5843 44
16c926c8 45/* pim_bsm_write_config - Write the interface pim bsm configuration.*/
d0e418b4 46void pim_bsm_write_config(struct vty *vty, struct interface *ifp)
16c926c8 47{
48 struct pim_interface *pim_ifp = ifp->info;
49
50 if (pim_ifp) {
51 if (!pim_ifp->bsm_enable)
52 vty_out(vty, " no ip pim bsm\n");
53 if (!pim_ifp->ucast_bsm_accept)
54 vty_out(vty, " no ip pim unicast-bsm\n");
55 }
56}
57
d0e418b4 58static void pim_free_bsgrp_data(struct bsgrp_node *bsgrp_node)
361b5843 59{
60 if (bsgrp_node->bsrp_list)
61 list_delete(&bsgrp_node->bsrp_list);
62 if (bsgrp_node->partial_bsrp_list)
63 list_delete(&bsgrp_node->partial_bsrp_list);
361b5843 64 XFREE(MTYPE_PIM_BSGRP_NODE, bsgrp_node);
65}
66
c295e391 67static void pim_free_bsgrp_node(struct route_table *rt, struct prefix *grp)
68{
69 struct route_node *rn;
70
71 rn = route_node_lookup(rt, grp);
72 if (rn) {
73 rn->info = NULL;
74 route_unlock_node(rn);
75 route_unlock_node(rn);
76 }
77}
78
361b5843 79static void pim_bsm_node_free(struct bsm_info *bsm)
80{
81 if (bsm->bsm)
82 XFREE(MTYPE_PIM_BSM_PKT_VAR_MEM, bsm->bsm);
83 XFREE(MTYPE_PIM_BSM_INFO, bsm);
84}
85
7b3e6ba1 86static int pim_g2rp_list_compare(struct bsm_rpinfo *node1,
87 struct bsm_rpinfo *node2)
88{
89 /* RP election Algo :
90 * Step-1 : Loweset Rp priority will have higher precedance.
91 * Step-2 : If priority same then higher hash val will have
92 * higher precedance.
93 * Step-3 : If Hash val is same then highest rp address will
94 * become elected RP.
95 */
96 if (node1->rp_prio < node2->rp_prio)
97 return -1;
98 if (node1->rp_prio > node2->rp_prio)
99 return 1;
100 if (node1->hash < node2->hash)
101 return 1;
102 if (node1->hash > node2->hash)
103 return -1;
104 if (node1->rp_address.s_addr < node2->rp_address.s_addr)
105 return 1;
106 if (node1->rp_address.s_addr > node2->rp_address.s_addr)
107 return -1;
108 return 0;
109}
110
111static void pim_free_bsrp_node(struct bsm_rpinfo *bsrp_info)
112{
113 if (bsrp_info->g2rp_timer)
114 THREAD_OFF(bsrp_info->g2rp_timer);
115 XFREE(MTYPE_PIM_BSRP_NODE, bsrp_info);
116}
117
118static struct list *pim_alloc_bsrp_list(void)
119{
120 struct list *new_list = NULL;
121
122 new_list = list_new();
123
124 if (!new_list)
125 return NULL;
126
127 new_list->cmp = (int (*)(void *, void *))pim_g2rp_list_compare;
128 new_list->del = (void (*)(void *))pim_free_bsrp_node;
129
130 return new_list;
131}
132
133static struct bsgrp_node *pim_bsm_new_bsgrp_node(struct route_table *rt,
134 struct prefix *grp)
135{
136 struct route_node *rn;
137 struct bsgrp_node *bsgrp;
138
139 rn = route_node_get(rt, grp);
140 if (!rn) {
141 zlog_warn("%s: route node creation failed",
142 __PRETTY_FUNCTION__);
143 return NULL;
144 }
145 bsgrp = XCALLOC(MTYPE_PIM_BSGRP_NODE, sizeof(struct bsgrp_node));
146
147 if (!bsgrp) {
148 if (PIM_DEBUG_BSM)
149 zlog_debug("%s: bsgrp alloc failed",
150 __PRETTY_FUNCTION__);
151 route_unlock_node(rn);
152 return NULL;
153 }
154
155 rn->info = bsgrp;
156 bsgrp->bsrp_list = pim_alloc_bsrp_list();
157 bsgrp->partial_bsrp_list = pim_alloc_bsrp_list();
158
159 if ((!bsgrp->bsrp_list) || (!bsgrp->partial_bsrp_list)) {
160 route_unlock_node(rn);
161 pim_free_bsgrp_data(bsgrp);
162 return NULL;
163 }
164
165 prefix_copy(&bsgrp->group, grp);
166 return bsgrp;
167}
168
23255dfd 169static int pim_on_bs_timer(struct thread *t)
170{
c843f56d 171 struct route_node *rn;
172 struct bsm_scope *scope;
173 struct bsgrp_node *bsgrp_node;
174 struct bsm_rpinfo *bsrp;
175 struct prefix nht_p;
176 char buf[PREFIX2STR_BUFFER];
177 bool is_bsr_tracking = true;
178
179 scope = THREAD_ARG(t);
180 THREAD_OFF(scope->bs_timer);
181
182 if (PIM_DEBUG_BSM)
183 zlog_debug("%s: Bootstrap Timer expired for scope: %d",
184 __PRETTY_FUNCTION__, scope->sz_id);
185
186 /* Remove next hop tracking for the bsr */
187 nht_p.family = AF_INET;
188 nht_p.prefixlen = IPV4_MAX_BITLEN;
189 nht_p.u.prefix4 = scope->current_bsr;
190 if (PIM_DEBUG_BSM) {
191 prefix2str(&nht_p, buf, sizeof(buf));
192 zlog_debug("%s: Deregister BSR addr %s with Zebra NHT",
193 __PRETTY_FUNCTION__, buf);
194 }
195 pim_delete_tracked_nexthop(scope->pim, &nht_p, NULL, NULL,
196 is_bsr_tracking);
197
198 /* Reset scope zone data */
199 scope->accept_nofwd_bsm = false;
200 scope->state = ACCEPT_ANY;
201 scope->current_bsr.s_addr = INADDR_ANY;
202 scope->current_bsr_prio = 0;
203 scope->current_bsr_first_ts = 0;
204 scope->current_bsr_last_ts = 0;
205 scope->bsm_frag_tag = 0;
206 list_delete_all_node(scope->bsm_list);
207
208 for (rn = route_top(scope->bsrp_table); rn; rn = route_next(rn)) {
209
210 bsgrp_node = (struct bsgrp_node *)rn->info;
211 if (!bsgrp_node) {
212 if (PIM_DEBUG_BSM)
213 zlog_debug("%s: bsgrp_node is null",
214 __PRETTY_FUNCTION__);
215 continue;
216 }
217 /* Give grace time for rp to continue for another hold time */
218 if ((bsgrp_node->bsrp_list) && (bsgrp_node->bsrp_list->count)) {
219 bsrp = listnode_head(bsgrp_node->bsrp_list);
220 pim_g2rp_timer_restart(bsrp, bsrp->rp_holdtime);
221 }
222 /* clear pending list */
223 if ((bsgrp_node->partial_bsrp_list)
224 && (bsgrp_node->partial_bsrp_list->count)) {
225 list_delete_all_node(bsgrp_node->partial_bsrp_list);
226 bsgrp_node->pend_rp_cnt = 0;
227 }
228 }
23255dfd 229 return 0;
230}
231
232static void pim_bs_timer_stop(struct bsm_scope *scope)
233{
234 if (PIM_DEBUG_BSM)
235 zlog_debug("%s : BS timer being stopped of sz: %d",
236 __PRETTY_FUNCTION__, scope->sz_id);
237 THREAD_OFF(scope->bs_timer);
238}
239
240static void pim_bs_timer_start(struct bsm_scope *scope, int bs_timeout)
241{
242 if (!scope) {
243 if (PIM_DEBUG_BSM)
244 zlog_debug("%s : Invalid scope(NULL).",
245 __PRETTY_FUNCTION__);
246 return;
247 }
248 THREAD_OFF(scope->bs_timer);
249 if (PIM_DEBUG_BSM)
250 zlog_debug("%s : starting bs timer for scope %d with timeout %d secs",
251 __PRETTY_FUNCTION__, scope->sz_id, bs_timeout);
252 thread_add_timer(router->master, pim_on_bs_timer, scope, bs_timeout,
253 &scope->bs_timer);
254}
255
5acde1cf 256static inline void pim_bs_timer_restart(struct bsm_scope *scope, int bs_timeout)
257{
258 pim_bs_timer_start(scope, bs_timeout);
259}
260
361b5843 261void pim_bsm_proc_init(struct pim_instance *pim)
262{
263 memset(&pim->global_scope, 0, sizeof(struct bsm_scope));
264
265 pim->global_scope.sz_id = PIM_GBL_SZ_ID;
266 pim->global_scope.bsrp_table = route_table_init();
267 pim->global_scope.accept_nofwd_bsm = true;
268 pim->global_scope.state = NO_INFO;
269 pim->global_scope.pim = pim;
270 pim->global_scope.bsm_list = list_new();
271 pim->global_scope.bsm_list->del = (void (*)(void *))pim_bsm_node_free;
272 pim_bs_timer_start(&pim->global_scope, PIM_BS_TIME);
273}
274
275void pim_bsm_proc_free(struct pim_instance *pim)
276{
277 struct route_node *rn;
278 struct bsgrp_node *bsgrp;
279
280 pim_bs_timer_stop(&pim->global_scope);
281
282 if (pim->global_scope.bsm_list)
283 list_delete(&pim->global_scope.bsm_list);
284
d0e418b4 285 for (rn = route_top(pim->global_scope.bsrp_table); rn;
286 rn = route_next(rn)) {
361b5843 287 bsgrp = rn->info;
288 if (!bsgrp)
289 continue;
290 pim_free_bsgrp_data(bsgrp);
291 }
292
293 if (pim->global_scope.bsrp_table)
294 route_table_finish(pim->global_scope.bsrp_table);
295}
296
c295e391 297static bool is_hold_time_elapsed(void *data)
298{
299 struct bsm_rpinfo *bsrp;
300
301 bsrp = data;
302
303 if (bsrp->elapse_time < bsrp->rp_holdtime)
304 return false;
305 else
306 return true;
307}
308
a5164e97 309static int pim_on_g2rp_timer(struct thread *t)
310{
c295e391 311 struct bsm_rpinfo *bsrp;
312 struct bsm_rpinfo *bsrp_node;
313 struct bsgrp_node *bsgrp_node;
314 struct listnode *bsrp_ln;
315 struct pim_instance *pim;
316 struct rp_info *rp_info;
317 struct route_node *rn;
318 uint16_t elapse;
319 struct in_addr bsrp_addr;
320
321 bsrp = THREAD_ARG(t);
322 THREAD_OFF(bsrp->g2rp_timer);
323 bsgrp_node = bsrp->bsgrp_node;
324
325 /* elapse time is the hold time of expired node */
326 elapse = bsrp->rp_holdtime;
327 bsrp_addr = bsrp->rp_address;
328
329 /* update elapse for all bsrp nodes */
330 for (ALL_LIST_ELEMENTS_RO(bsgrp_node->bsrp_list, bsrp_ln, bsrp_node))
331 bsrp_node->elapse_time += elapse;
332
333 /* remove the expired nodes from the list */
334 list_filter_out_nodes(bsgrp_node->bsrp_list, is_hold_time_elapsed);
335
336 /* Get the next elected rp node */
337 bsrp = listnode_head(bsgrp_node->bsrp_list);
338 pim = bsgrp_node->scope->pim;
339 rn = route_node_lookup(pim->rp_table, &bsgrp_node->group);
340
341 if (!rn) {
342 zlog_warn("%s: Route node doesn't exist", __PRETTY_FUNCTION__);
343 return 0;
344 }
345
346 rp_info = (struct rp_info *)rn->info;
347
348 if (!rp_info) {
349 route_unlock_node(rn);
350 return 0;
351 }
352
353 if (rp_info->rp_src != RP_SRC_STATIC) {
354 /* If new rp available, change it else delete the existing */
355 if (bsrp) {
356 bsrp_addr = bsrp->rp_address;
357 pim_g2rp_timer_start(
358 bsrp, (bsrp->rp_holdtime - bsrp->elapse_time));
359 pim_rp_change(pim, bsrp_addr, bsgrp_node->group,
360 RP_SRC_BSR);
361 } else {
362 pim_rp_del(pim, bsrp_addr, bsgrp_node->group, NULL,
363 RP_SRC_BSR);
364 }
365 }
366
367 if ((!bsgrp_node->bsrp_list->count)
368 && (!bsgrp_node->partial_bsrp_list->count)) {
369 pim_free_bsgrp_node(pim->global_scope.bsrp_table,
370 &bsgrp_node->group);
371 pim_free_bsgrp_data(bsgrp_node);
372 }
373
a5164e97 374 return 0;
375}
376
377static void pim_g2rp_timer_start(struct bsm_rpinfo *bsrp, int hold_time)
378{
379 if (!bsrp) {
380 if (PIM_DEBUG_BSM)
381 zlog_debug("%s : Invalid brsp(NULL).",
382 __PRETTY_FUNCTION__);
383 return;
384 }
385 THREAD_OFF(bsrp->g2rp_timer);
386 if (PIM_DEBUG_BSM) {
387 char buf[48];
388
389 zlog_debug(
390 "%s : starting g2rp timer for grp: %s - rp: %s with timeout %d secs(Actual Hold time : %d secs)",
391 __PRETTY_FUNCTION__,
392 prefix2str(&bsrp->bsgrp_node->group, buf, 48),
393 inet_ntoa(bsrp->rp_address), hold_time,
394 bsrp->rp_holdtime);
395 }
396
397 thread_add_timer(router->master, pim_on_g2rp_timer, bsrp, hold_time,
398 &bsrp->g2rp_timer);
399}
400
401static inline void pim_g2rp_timer_restart(struct bsm_rpinfo *bsrp,
402 int hold_time)
403{
404 pim_g2rp_timer_start(bsrp, hold_time);
405}
406
20fd30e5 407static void pim_g2rp_timer_stop(struct bsm_rpinfo *bsrp)
408{
409 if (!bsrp)
410 return;
411
412 if (PIM_DEBUG_BSM) {
413 char buf[48];
414
415 zlog_debug("%s : stopping g2rp timer for grp: %s - rp: %s",
416 __PRETTY_FUNCTION__,
417 prefix2str(&bsrp->bsgrp_node->group, buf, 48),
418 inet_ntoa(bsrp->rp_address));
419 }
420
421 THREAD_OFF(bsrp->g2rp_timer);
422}
423
424static bool is_hold_time_zero(void *data)
425{
426 struct bsm_rpinfo *bsrp;
427
428 bsrp = data;
429
430 if (bsrp->rp_holdtime)
431 return false;
432 else
433 return true;
434}
435
436static void pim_instate_pend_list(struct bsgrp_node *bsgrp_node)
437{
438 struct bsm_rpinfo *active;
439 struct bsm_rpinfo *pend;
440 struct list *temp;
441 struct rp_info *rp_info;
442 struct route_node *rn;
443 struct pim_instance *pim;
444 struct rp_info *rp_all;
445 struct prefix group_all;
446 bool had_rp_node = true;
447
448 pim = bsgrp_node->scope->pim;
449 active = listnode_head(bsgrp_node->bsrp_list);
450
451 /* Remove nodes with hold time 0 & check if list still has a head */
452 list_filter_out_nodes(bsgrp_node->partial_bsrp_list, is_hold_time_zero);
453 pend = listnode_head(bsgrp_node->partial_bsrp_list);
454
455 if (!str2prefix("224.0.0.0/4", &group_all))
456 return;
457
458 rp_all = pim_rp_find_match_group(pim, &group_all);
459 rn = route_node_lookup(pim->rp_table, &bsgrp_node->group);
460
461 if (pend)
462 pim_g2rp_timer_start(pend, pend->rp_holdtime);
463
464 /* if rp node doesn't exist or exist but not configured(rp_all),
465 * install the rp from head(if exists) of partial list. List is
466 * is sorted such that head is the elected RP for the group.
467 */
468 if (!rn || (prefix_same(&rp_all->group, &bsgrp_node->group)
469 && pim_rpf_addr_is_inaddr_none(&rp_all->rp))) {
470 if (PIM_DEBUG_BSM)
471 zlog_debug("%s: Route node doesn't exist",
472 __PRETTY_FUNCTION__);
473 if (pend)
474 pim_rp_new(pim, pend->rp_address, bsgrp_node->group,
475 NULL, RP_SRC_BSR);
476 had_rp_node = false;
477 } else {
478 rp_info = (struct rp_info *)rn->info;
479 if (!rp_info) {
480 route_unlock_node(rn);
481 if (pend)
482 pim_rp_new(pim, pend->rp_address,
483 bsgrp_node->group, NULL, RP_SRC_BSR);
484 had_rp_node = false;
485 }
486 }
487
488 /* We didn't have rp node and pending list is empty(unlikely), cleanup*/
489 if ((!had_rp_node) && (!pend)) {
490 pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table,
491 &bsgrp_node->group);
492 pim_free_bsgrp_data(bsgrp_node);
493 return;
494 }
495
496 if ((had_rp_node) && (rp_info->rp_src != RP_SRC_STATIC)) {
497 /* This means we searched and got rp node, needs unlock */
498 route_unlock_node(rn);
499
500 if (active && pend) {
501 if ((active->rp_address.s_addr
502 != pend->rp_address.s_addr))
503 pim_rp_change(pim, pend->rp_address,
504 bsgrp_node->group, RP_SRC_BSR);
505 }
506
507 /* Possible when the first BSM has group with 0 rp count */
508 if ((!active) && (!pend)) {
509 if (PIM_DEBUG_BSM) {
510 zlog_debug(
511 "%s: Both bsrp and partial list are empty",
512 __PRETTY_FUNCTION__);
513 }
514 pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table,
515 &bsgrp_node->group);
516 pim_free_bsgrp_data(bsgrp_node);
517 return;
518 }
519
520 /* Possible when a group with 0 rp count received in BSM */
521 if ((active) && (!pend)) {
522 pim_rp_del(pim, active->rp_address, bsgrp_node->group,
523 NULL, RP_SRC_BSR);
524 pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table,
525 &bsgrp_node->group);
526 if (PIM_DEBUG_BSM) {
527 zlog_debug("%s:Pend List is null,del grp node",
528 __PRETTY_FUNCTION__);
529 }
530 pim_free_bsgrp_data(bsgrp_node);
531 return;
532 }
533 }
534
535 if ((had_rp_node) && (rp_info->rp_src == RP_SRC_STATIC)) {
536 /* We need to unlock rn this case */
537 route_unlock_node(rn);
538 /* there is a chance that static rp exist and bsrp cleaned
539 * so clean bsgrp node if pending list empty
540 */
541 if (!pend) {
542 if (PIM_DEBUG_BSM)
543 zlog_debug(
544 "%s: Partial list is empty, static rp exists",
545 __PRETTY_FUNCTION__);
546 pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table,
547 &bsgrp_node->group);
548 pim_free_bsgrp_data(bsgrp_node);
549 return;
550 }
551 }
552
553 /* swap the list & delete all nodes in partial list (old bsrp_list)
554 * before swap
555 * active is head of bsrp list
556 * pend is head of partial list
557 * After swap
558 * active is head of partial list
559 * pend is head of bsrp list
560 * So check appriate head after swap and clean the new partial list
561 */
562 temp = bsgrp_node->bsrp_list;
563 bsgrp_node->bsrp_list = bsgrp_node->partial_bsrp_list;
564 bsgrp_node->partial_bsrp_list = temp;
565
566 if (active) {
567 pim_g2rp_timer_stop(active);
568 list_delete_all_node(bsgrp_node->partial_bsrp_list);
569 }
570}
571
5acde1cf 572static bool pim_bsr_rpf_check(struct pim_instance *pim, struct in_addr bsr,
573 struct in_addr ip_src_addr)
574{
575 struct pim_nexthop nexthop;
576 int result;
577
578 memset(&nexthop, 0, sizeof(nexthop));
579
580 /* New BSR recived */
581 if (bsr.s_addr != pim->global_scope.current_bsr.s_addr) {
582 result = pim_nexthop_match(pim, bsr, ip_src_addr);
583
584 /* Nexthop lookup pass for the new BSR address */
585 if (result)
586 return true;
587
588 if (PIM_DEBUG_BSM) {
589 char bsr_str[INET_ADDRSTRLEN];
590
591 pim_inet4_dump("<bsr?>", bsr, bsr_str, sizeof(bsr_str));
592 zlog_debug("%s : No route to BSR address %s",
593 __PRETTY_FUNCTION__, bsr_str);
594 }
595 return false;
596 }
597
598 return pim_nexthop_match_nht_cache(pim, bsr, ip_src_addr);
599}
600
601static bool is_preferred_bsr(struct pim_instance *pim, struct in_addr bsr,
602 uint32_t bsr_prio)
603{
604 if (bsr.s_addr == pim->global_scope.current_bsr.s_addr)
605 return true;
606
607 if (bsr_prio > pim->global_scope.current_bsr_prio)
608 return true;
609
610 else if (bsr_prio == pim->global_scope.current_bsr_prio) {
611 if (bsr.s_addr >= pim->global_scope.current_bsr.s_addr)
612 return true;
613 else
614 return false;
615 } else
616 return false;
617}
618
619static void pim_bsm_update(struct pim_instance *pim, struct in_addr bsr,
620 uint32_t bsr_prio)
621{
622 struct pim_nexthop_cache pnc;
623
624 if (bsr.s_addr != pim->global_scope.current_bsr.s_addr) {
625 struct prefix nht_p;
626 char buf[PREFIX2STR_BUFFER];
627 bool is_bsr_tracking = true;
628
629 /* De-register old BSR and register new BSR with Zebra NHT */
630 nht_p.family = AF_INET;
631 nht_p.prefixlen = IPV4_MAX_BITLEN;
632
633 if (pim->global_scope.current_bsr.s_addr != INADDR_ANY) {
634 nht_p.u.prefix4 = pim->global_scope.current_bsr;
635 if (PIM_DEBUG_BSM) {
636 prefix2str(&nht_p, buf, sizeof(buf));
637 zlog_debug(
638 "%s: Deregister BSR addr %s with Zebra NHT",
639 __PRETTY_FUNCTION__, buf);
640 }
641 pim_delete_tracked_nexthop(pim, &nht_p, NULL, NULL,
642 is_bsr_tracking);
643 }
644
645 nht_p.u.prefix4 = bsr;
646 if (PIM_DEBUG_BSM) {
647 prefix2str(&nht_p, buf, sizeof(buf));
648 zlog_debug(
649 "%s: NHT Register BSR addr %s with Zebra NHT",
650 __PRETTY_FUNCTION__, buf);
651 }
652
653 memset(&pnc, 0, sizeof(struct pim_nexthop_cache));
654 pim_find_or_track_nexthop(pim, &nht_p, NULL, NULL,
655 is_bsr_tracking, &pnc);
656 pim->global_scope.current_bsr = bsr;
657 pim->global_scope.current_bsr_first_ts =
658 pim_time_monotonic_sec();
659 pim->global_scope.state = ACCEPT_PREFERRED;
660 }
661 pim->global_scope.current_bsr_prio = bsr_prio;
662 pim->global_scope.current_bsr_last_ts = pim_time_monotonic_sec();
663}
664
d0e418b4 665struct bsgrp_node *pim_bsm_get_bsgrp_node(struct bsm_scope *scope,
666 struct prefix *grp)
667{
668 struct route_node *rn;
669 struct bsgrp_node *bsgrp;
670
671 rn = route_node_lookup(scope->bsrp_table, grp);
672 if (!rn) {
673 if (PIM_DEBUG_BSM)
674 zlog_debug("%s: Route node doesn't exist for the group",
675 __PRETTY_FUNCTION__);
676 return NULL;
677 }
678 bsgrp = rn->info;
679 route_unlock_node(rn);
680
681 return bsgrp;
682}
5acde1cf 683
7b3e6ba1 684static uint32_t hash_calc_on_grp_rp(struct prefix group, struct in_addr rp,
685 uint8_t hashmasklen)
686{
687 uint64_t temp;
688 uint32_t hash;
689 uint32_t grpaddr;
690 uint32_t rp_add;
691 uint32_t mask = 0xffffffff;
692
693 /* mask to be made zero if hashmasklen is 0 because mask << 32
694 * may not give 0. hashmasklen can be 0 to 32.
695 */
696 if (hashmasklen == 0)
697 mask = 0;
698
699 /* in_addr stores ip in big endian, hence network byte order
700 * convert to uint32 before processing hash
701 */
702 grpaddr = ntohl(group.u.prefix4.s_addr);
703 /* Avoid shifting by 32 bit on a 32 bit register */
704 if (hashmasklen)
705 grpaddr = grpaddr & ((mask << (32 - hashmasklen)));
706 else
707 grpaddr = grpaddr & mask;
708 rp_add = ntohl(rp.s_addr);
709 temp = 1103515245 * ((1103515245 * grpaddr + 12345) ^ rp_add) + 12345;
710 hash = temp & (0x7fffffff);
711 return hash;
712}
713
714static bool pim_install_bsm_grp_rp(struct pim_instance *pim,
715 struct bsgrp_node *grpnode,
716 struct bsmmsg_rpinfo *rp)
717{
718 struct bsm_rpinfo *bsm_rpinfo;
719 uint8_t hashMask_len = pim->global_scope.hashMasklen;
720
721 /*memory allocation for bsm_rpinfo */
722 bsm_rpinfo = XCALLOC(MTYPE_PIM_BSRP_NODE, sizeof(*bsm_rpinfo));
723
724 if (!bsm_rpinfo) {
725 if (PIM_DEBUG_BSM)
726 zlog_debug("%s, Memory allocation failed.\r\n",
727 __PRETTY_FUNCTION__);
728 return false;
729 }
730
731 bsm_rpinfo->rp_prio = rp->rp_pri;
732 bsm_rpinfo->rp_holdtime = rp->rp_holdtime;
733 memcpy(&bsm_rpinfo->rp_address, &rp->rpaddr.addr,
734 sizeof(struct in_addr));
735 bsm_rpinfo->elapse_time = 0;
736
737 /* Back pointer to the group node. */
738 bsm_rpinfo->bsgrp_node = grpnode;
739
740 /* update hash for this rp node */
741 bsm_rpinfo->hash = hash_calc_on_grp_rp(grpnode->group, rp->rpaddr.addr,
742 hashMask_len);
743 if (listnode_add_sort_nodup(grpnode->partial_bsrp_list, bsm_rpinfo)) {
744 if (PIM_DEBUG_BSM)
745 zlog_debug(
746 "%s, bs_rpinfo node added to the partial bs_rplist.\r\n",
747 __PRETTY_FUNCTION__);
748 return true;
749 }
750
751 if (PIM_DEBUG_BSM)
752 zlog_debug("%s: list node not added\n", __PRETTY_FUNCTION__);
753
754 XFREE(MTYPE_PIM_BSRP_NODE, bsm_rpinfo);
755 return false;
756}
757
758static void pim_update_pending_rp_cnt(struct bsm_scope *sz,
759 struct bsgrp_node *bsgrp,
760 uint16_t bsm_frag_tag,
761 uint32_t total_rp_count)
762{
763 if (bsgrp->pend_rp_cnt) {
764 /* received bsm is different packet ,
765 * it is not same fragment.
766 */
767 if (bsm_frag_tag != bsgrp->frag_tag) {
768 if (PIM_DEBUG_BSM)
769 zlog_debug(
770 "%s,Received a new BSM ,so clear the pending bs_rpinfo list.\r\n",
771 __PRETTY_FUNCTION__);
772 list_delete_all_node(bsgrp->partial_bsrp_list);
773 bsgrp->pend_rp_cnt = total_rp_count;
774 }
775 } else
776 bsgrp->pend_rp_cnt = total_rp_count;
777
778 bsgrp->frag_tag = bsm_frag_tag;
779}
780
781/* Parsing BSR packet and adding to partial list of corresponding bsgrp node */
782static bool pim_bsm_parse_install_g2rp(struct bsm_scope *scope, uint8_t *buf,
783 int buflen, uint16_t bsm_frag_tag)
784{
785 struct bsmmsg_grpinfo grpinfo;
786 struct bsmmsg_rpinfo rpinfo;
787 struct prefix group;
788 struct bsgrp_node *bsgrp = NULL;
789 int frag_rp_cnt = 0;
790 int offset = 0;
791 int ins_count = 0;
792
793 while (buflen > offset) {
794 /* Extract Group tlv from BSM */
795 memcpy(&grpinfo, buf, sizeof(struct bsmmsg_grpinfo));
796
797 if (PIM_DEBUG_BSM) {
798 char grp_str[INET_ADDRSTRLEN];
799
800 pim_inet4_dump("<Group?>", grpinfo.group.addr, grp_str,
801 sizeof(grp_str));
802 zlog_debug(
803 "%s, Group %s Rpcount:%d Fragment-Rp-count:%d\r\n",
804 __PRETTY_FUNCTION__, grp_str, grpinfo.rp_count,
805 grpinfo.frag_rp_count);
806 }
807
808 buf += sizeof(struct bsmmsg_grpinfo);
809 offset += sizeof(struct bsmmsg_grpinfo);
810
811 if (grpinfo.rp_count == 0) {
812 if (PIM_DEBUG_BSM) {
813 char grp_str[INET_ADDRSTRLEN];
814
815 pim_inet4_dump("<Group?>", grpinfo.group.addr,
816 grp_str, sizeof(grp_str));
817 zlog_debug(
818 "%s, Rp count is zero for group: %s\r\n",
819 __PRETTY_FUNCTION__, grp_str);
820 }
821 return false;
822 }
823
824 group.family = AF_INET;
825 group.prefixlen = grpinfo.group.mask;
826 group.u.prefix4.s_addr = grpinfo.group.addr.s_addr;
827
828 /* Get the Group node for the BSM rp table */
829 bsgrp = pim_bsm_get_bsgrp_node(scope, &group);
830
831 if (!bsgrp) {
832 if (PIM_DEBUG_BSM)
833 zlog_debug(
834 "%s, Create new BSM Group node.\r\n",
835 __PRETTY_FUNCTION__);
836
837 /* create a new node to be added to the tree. */
838 bsgrp = pim_bsm_new_bsgrp_node(scope->bsrp_table,
839 &group);
840
841 if (!bsgrp) {
842 zlog_debug(
843 "%s, Failed to get the BSM group node.\r\n",
844 __PRETTY_FUNCTION__);
845 continue;
846 }
847
848 bsgrp->scope = scope;
849 }
850
851 pim_update_pending_rp_cnt(scope, bsgrp, bsm_frag_tag,
852 grpinfo.rp_count);
853 frag_rp_cnt = grpinfo.frag_rp_count;
854 ins_count = 0;
855
856 while (frag_rp_cnt--) {
857 /* Extract RP address tlv from BSM */
858 memcpy(&rpinfo, buf, sizeof(struct bsmmsg_rpinfo));
859 rpinfo.rp_holdtime = ntohs(rpinfo.rp_holdtime);
860 buf += sizeof(struct bsmmsg_rpinfo);
861 offset += sizeof(struct bsmmsg_rpinfo);
862
863 if (PIM_DEBUG_BSM) {
864 char rp_str[INET_ADDRSTRLEN];
865
866 pim_inet4_dump("<Rpaddr?>", rpinfo.rpaddr.addr,
867 rp_str, sizeof(rp_str));
868 zlog_debug(
869 "%s, Rp address - %s; pri:%d hold:%d\r\n",
870 __PRETTY_FUNCTION__, rp_str,
871 rpinfo.rp_pri, rpinfo.rp_holdtime);
872 }
873
874 /* Call Install api to update grp-rp mappings */
875 if (pim_install_bsm_grp_rp(scope->pim, bsgrp, &rpinfo))
876 ins_count++;
877 }
878
879 bsgrp->pend_rp_cnt -= ins_count;
880
881 if (!bsgrp->pend_rp_cnt) {
882 if (PIM_DEBUG_BSM)
883 zlog_debug(
884 "%s, Recvd all the rps for this group, so bsrp list with penidng rp list.",
885 __PRETTY_FUNCTION__);
20fd30e5 886 /* replace the bsrp_list with pending list */
887 pim_instate_pend_list(bsgrp);
7b3e6ba1 888 }
889 }
890 return true;
891}
892
5acde1cf 893int pim_bsm_process(struct interface *ifp, struct ip *ip_hdr, uint8_t *buf,
894 uint32_t buf_size, bool no_fwd)
895{
896 struct bsm_hdr *bshdr;
897 struct bsmmsg_grpinfo *msg_grp;
898 struct pim_interface *pim_ifp = NULL;
899 struct pim_instance *pim;
900 char bsr_str[INET_ADDRSTRLEN];
901 uint16_t frag_tag;
902 bool empty_bsm = FALSE;
903
904 /* BSM Packet acceptance validation */
905 pim_ifp = ifp->info;
906 if (!pim_ifp) {
907 if (PIM_DEBUG_BSM)
908 zlog_debug("%s: multicast not enabled on interface %s",
909 __PRETTY_FUNCTION__, ifp->name);
910 return -1;
911 }
912
913 pim_ifp->pim_ifstat_bsm_rx++;
914 pim = pim_ifp->pim;
915 pim->bsm_rcvd++;
916
917 /* Drop if bsm processing is disabled on interface */
918 if (!pim_ifp->bsm_enable) {
919 zlog_warn("%s: BSM not enabled on interface %s",
920 __PRETTY_FUNCTION__, ifp->name);
921 pim_ifp->pim_ifstat_bsm_cfg_miss++;
922 pim->bsm_dropped++;
923 return -1;
924 }
925
926 bshdr = (struct bsm_hdr *)(buf + PIM_MSG_HEADER_LEN);
927 pim_inet4_dump("<bsr?>", bshdr->bsr_addr.addr, bsr_str,
928 sizeof(bsr_str));
929 pim->global_scope.hashMasklen = bshdr->hm_len;
930 frag_tag = ntohs(bshdr->frag_tag);
931
932 /* Identify empty BSM */
933 if ((buf_size - PIM_BSM_HDR_LEN - PIM_MSG_HEADER_LEN) < PIM_BSM_GRP_LEN)
934 empty_bsm = true;
935
936 if (!empty_bsm) {
937 msg_grp = (struct bsmmsg_grpinfo *)(buf + PIM_MSG_HEADER_LEN
938 + PIM_BSM_HDR_LEN);
939 /* Currently we don't support scope zoned BSM */
940 if (msg_grp->group.sz) {
941 if (PIM_DEBUG_BSM)
942 zlog_debug(
943 "%s : Administratively scoped range BSM received",
944 __PRETTY_FUNCTION__);
945 pim_ifp->pim_ifstat_bsm_invalid_sz++;
946 pim->bsm_dropped++;
947 return -1;
948 }
949 }
950
951 /* Drop if bsr is not preferred bsr */
952 if (!is_preferred_bsr(pim, bshdr->bsr_addr.addr, bshdr->bsr_prio)) {
953 if (PIM_DEBUG_BSM)
954 zlog_debug("%s : Received a non-preferred BSM",
955 __PRETTY_FUNCTION__);
956 pim->bsm_dropped++;
957 return -1;
958 }
959
960 if (no_fwd) {
961 /* only accept no-forward BSM if quick refresh on startup */
962 if ((pim->global_scope.accept_nofwd_bsm)
963 || (frag_tag == pim->global_scope.bsm_frag_tag)) {
964 pim->global_scope.accept_nofwd_bsm = false;
965 } else {
966 if (PIM_DEBUG_BSM)
967 zlog_debug(
968 "%s : nofwd_bsm received on %s when accpt_nofwd_bsm false",
969 __PRETTY_FUNCTION__, bsr_str);
970 pim->bsm_dropped++;
971 pim_ifp->pim_ifstat_ucast_bsm_cfg_miss++;
972 return -1;
973 }
974 }
975
976 /* Mulicast BSM received */
977 if (ip_hdr->ip_dst.s_addr == qpim_all_pim_routers_addr.s_addr) {
978 if (!no_fwd) {
979 if (!pim_bsr_rpf_check(pim, bshdr->bsr_addr.addr,
980 ip_hdr->ip_src)) {
981 if (PIM_DEBUG_BSM)
982 zlog_debug(
983 "%s : RPF check fail for BSR address %s",
984 __PRETTY_FUNCTION__, bsr_str);
985 pim->bsm_dropped++;
986 return -1;
987 }
988 }
989 } else if (if_lookup_exact_address(&ip_hdr->ip_dst, AF_INET,
990 pim->vrf_id)) {
991 /* Unicast BSM received - if ucast bsm not enabled on
992 * the interface, drop it
993 */
994 if (!pim_ifp->ucast_bsm_accept) {
995 if (PIM_DEBUG_BSM)
996 zlog_debug(
997 "%s : Unicast BSM not enabled on interface %s",
998 __PRETTY_FUNCTION__, ifp->name);
999 pim_ifp->pim_ifstat_ucast_bsm_cfg_miss++;
1000 pim->bsm_dropped++;
1001 return -1;
1002 }
1003
1004 } else {
1005 if (PIM_DEBUG_BSM)
1006 zlog_debug("%s : Invalid destination address",
1007 __PRETTY_FUNCTION__);
1008 pim->bsm_dropped++;
1009 return -1;
1010 }
1011
1012 if (empty_bsm) {
1013 if (PIM_DEBUG_BSM)
1014 zlog_debug("%s : Empty Pref BSM received",
1015 __PRETTY_FUNCTION__);
1016 }
7b3e6ba1 1017 /* Parse Update bsm rp table and install/uninstall rp if required */
1018 if (!pim_bsm_parse_install_g2rp(
1019 &pim_ifp->pim->global_scope,
1020 (buf + PIM_BSM_HDR_LEN + PIM_MSG_HEADER_LEN),
1021 (buf_size - PIM_BSM_HDR_LEN - PIM_MSG_HEADER_LEN),
1022 frag_tag)) {
1023 if (PIM_DEBUG_BSM) {
1024 zlog_debug("%s, Parsing BSM failed.\r\n",
1025 __PRETTY_FUNCTION__);
1026 }
1027 pim->bsm_dropped++;
1028 return -1;
1029 }
5acde1cf 1030 /* Restart the bootstrap timer */
1031 pim_bs_timer_restart(&pim_ifp->pim->global_scope,
1032 PIM_BSR_DEFAULT_TIMEOUT);
1033
1034 /* If new BSM received, clear the old bsm database */
1035 if (pim_ifp->pim->global_scope.bsm_frag_tag != frag_tag) {
1036 if (PIM_DEBUG_BSM) {
1037 zlog_debug("%s: Current frag tag: %d Frag teg rcvd: %d",
1038 __PRETTY_FUNCTION__,
1039 pim_ifp->pim->global_scope.bsm_frag_tag,
1040 frag_tag);
1041 }
1042 list_delete_all_node(pim_ifp->pim->global_scope.bsm_list);
1043 pim_ifp->pim->global_scope.bsm_frag_tag = frag_tag;
1044 }
1045
1046 /* update the scope information from bsm */
1047 pim_bsm_update(pim, bshdr->bsr_addr.addr, bshdr->bsr_prio);
1048 return 0;
1049}
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