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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 | */ | |
2618a52e DL |
22 | |
23 | #ifdef HAVE_CONFIG_H | |
24 | #include "config.h" | |
25 | #endif | |
26 | ||
361b5843 | 27 | #include "if.h" |
28 | #include "pimd.h" | |
29 | #include "pim_iface.h" | |
361b5843 | 30 | #include "pim_instance.h" |
31 | #include "pim_rpf.h" | |
32 | #include "pim_hello.h" | |
33 | #include "pim_pim.h" | |
34 | #include "pim_nht.h" | |
35 | #include "pim_bsm.h" | |
36 | #include "pim_time.h" | |
37 | ||
38 | /* Functions forward declaration */ | |
39 | static void pim_bs_timer_start(struct bsm_scope *scope, int bs_timeout); | |
a5164e97 | 40 | static void pim_g2rp_timer_start(struct bsm_rpinfo *bsrp, int hold_time); |
41 | static inline void pim_g2rp_timer_restart(struct bsm_rpinfo *bsrp, | |
42 | int hold_time); | |
23255dfd | 43 | |
44 | /* Memory Types */ | |
45 | DEFINE_MTYPE_STATIC(PIMD, PIM_BSGRP_NODE, "PIM BSR advertised grp info") | |
46 | DEFINE_MTYPE_STATIC(PIMD, PIM_BSRP_NODE, "PIM BSR advertised RP info") | |
47 | DEFINE_MTYPE_STATIC(PIMD, PIM_BSM_INFO, "PIM BSM Info") | |
48 | DEFINE_MTYPE_STATIC(PIMD, PIM_BSM_PKT_VAR_MEM, "PIM BSM Packet") | |
361b5843 | 49 | |
79d97386 | 50 | /* All bsm packets forwarded shall be fit within ip mtu less iphdr(max) */ |
51 | #define MAX_IP_HDR_LEN 24 | |
52 | ||
16c926c8 | 53 | /* pim_bsm_write_config - Write the interface pim bsm configuration.*/ |
d0e418b4 | 54 | void pim_bsm_write_config(struct vty *vty, struct interface *ifp) |
16c926c8 | 55 | { |
56 | struct pim_interface *pim_ifp = ifp->info; | |
57 | ||
58 | if (pim_ifp) { | |
59 | if (!pim_ifp->bsm_enable) | |
60 | vty_out(vty, " no ip pim bsm\n"); | |
61 | if (!pim_ifp->ucast_bsm_accept) | |
62 | vty_out(vty, " no ip pim unicast-bsm\n"); | |
63 | } | |
64 | } | |
65 | ||
d0e418b4 | 66 | static void pim_free_bsgrp_data(struct bsgrp_node *bsgrp_node) |
361b5843 | 67 | { |
68 | if (bsgrp_node->bsrp_list) | |
69 | list_delete(&bsgrp_node->bsrp_list); | |
70 | if (bsgrp_node->partial_bsrp_list) | |
71 | list_delete(&bsgrp_node->partial_bsrp_list); | |
361b5843 | 72 | XFREE(MTYPE_PIM_BSGRP_NODE, bsgrp_node); |
73 | } | |
74 | ||
c295e391 | 75 | static void pim_free_bsgrp_node(struct route_table *rt, struct prefix *grp) |
76 | { | |
77 | struct route_node *rn; | |
78 | ||
79 | rn = route_node_lookup(rt, grp); | |
80 | if (rn) { | |
81 | rn->info = NULL; | |
82 | route_unlock_node(rn); | |
83 | route_unlock_node(rn); | |
84 | } | |
85 | } | |
86 | ||
361b5843 | 87 | static void pim_bsm_node_free(struct bsm_info *bsm) |
88 | { | |
89 | if (bsm->bsm) | |
90 | XFREE(MTYPE_PIM_BSM_PKT_VAR_MEM, bsm->bsm); | |
91 | XFREE(MTYPE_PIM_BSM_INFO, bsm); | |
92 | } | |
93 | ||
7b3e6ba1 | 94 | static int pim_g2rp_list_compare(struct bsm_rpinfo *node1, |
95 | struct bsm_rpinfo *node2) | |
96 | { | |
97 | /* RP election Algo : | |
98 | * Step-1 : Loweset Rp priority will have higher precedance. | |
99 | * Step-2 : If priority same then higher hash val will have | |
100 | * higher precedance. | |
101 | * Step-3 : If Hash val is same then highest rp address will | |
102 | * become elected RP. | |
103 | */ | |
104 | if (node1->rp_prio < node2->rp_prio) | |
105 | return -1; | |
106 | if (node1->rp_prio > node2->rp_prio) | |
107 | return 1; | |
108 | if (node1->hash < node2->hash) | |
109 | return 1; | |
110 | if (node1->hash > node2->hash) | |
111 | return -1; | |
112 | if (node1->rp_address.s_addr < node2->rp_address.s_addr) | |
113 | return 1; | |
114 | if (node1->rp_address.s_addr > node2->rp_address.s_addr) | |
115 | return -1; | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static void pim_free_bsrp_node(struct bsm_rpinfo *bsrp_info) | |
120 | { | |
121 | if (bsrp_info->g2rp_timer) | |
122 | THREAD_OFF(bsrp_info->g2rp_timer); | |
123 | XFREE(MTYPE_PIM_BSRP_NODE, bsrp_info); | |
124 | } | |
125 | ||
126 | static struct list *pim_alloc_bsrp_list(void) | |
127 | { | |
128 | struct list *new_list = NULL; | |
129 | ||
130 | new_list = list_new(); | |
131 | ||
132 | if (!new_list) | |
133 | return NULL; | |
134 | ||
135 | new_list->cmp = (int (*)(void *, void *))pim_g2rp_list_compare; | |
136 | new_list->del = (void (*)(void *))pim_free_bsrp_node; | |
137 | ||
138 | return new_list; | |
139 | } | |
140 | ||
141 | static struct bsgrp_node *pim_bsm_new_bsgrp_node(struct route_table *rt, | |
142 | struct prefix *grp) | |
143 | { | |
144 | struct route_node *rn; | |
145 | struct bsgrp_node *bsgrp; | |
146 | ||
147 | rn = route_node_get(rt, grp); | |
148 | if (!rn) { | |
149 | zlog_warn("%s: route node creation failed", | |
150 | __PRETTY_FUNCTION__); | |
151 | return NULL; | |
152 | } | |
153 | bsgrp = XCALLOC(MTYPE_PIM_BSGRP_NODE, sizeof(struct bsgrp_node)); | |
154 | ||
7b3e6ba1 | 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 | 169 | static 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 | ||
232 | static 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 | ||
240 | static 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 | 256 | static 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 | 261 | void 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 | ||
275 | void 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 | ||
4d19a911 | 293 | route_table_finish(pim->global_scope.bsrp_table); |
361b5843 | 294 | } |
295 | ||
c295e391 | 296 | static bool is_hold_time_elapsed(void *data) |
297 | { | |
298 | struct bsm_rpinfo *bsrp; | |
299 | ||
300 | bsrp = data; | |
301 | ||
302 | if (bsrp->elapse_time < bsrp->rp_holdtime) | |
303 | return false; | |
304 | else | |
305 | return true; | |
306 | } | |
307 | ||
a5164e97 | 308 | static int pim_on_g2rp_timer(struct thread *t) |
309 | { | |
c295e391 | 310 | struct bsm_rpinfo *bsrp; |
311 | struct bsm_rpinfo *bsrp_node; | |
312 | struct bsgrp_node *bsgrp_node; | |
313 | struct listnode *bsrp_ln; | |
314 | struct pim_instance *pim; | |
315 | struct rp_info *rp_info; | |
316 | struct route_node *rn; | |
317 | uint16_t elapse; | |
318 | struct in_addr bsrp_addr; | |
319 | ||
320 | bsrp = THREAD_ARG(t); | |
321 | THREAD_OFF(bsrp->g2rp_timer); | |
322 | bsgrp_node = bsrp->bsgrp_node; | |
323 | ||
324 | /* elapse time is the hold time of expired node */ | |
325 | elapse = bsrp->rp_holdtime; | |
326 | bsrp_addr = bsrp->rp_address; | |
327 | ||
328 | /* update elapse for all bsrp nodes */ | |
329 | for (ALL_LIST_ELEMENTS_RO(bsgrp_node->bsrp_list, bsrp_ln, bsrp_node)) | |
330 | bsrp_node->elapse_time += elapse; | |
331 | ||
332 | /* remove the expired nodes from the list */ | |
333 | list_filter_out_nodes(bsgrp_node->bsrp_list, is_hold_time_elapsed); | |
334 | ||
335 | /* Get the next elected rp node */ | |
336 | bsrp = listnode_head(bsgrp_node->bsrp_list); | |
337 | pim = bsgrp_node->scope->pim; | |
338 | rn = route_node_lookup(pim->rp_table, &bsgrp_node->group); | |
339 | ||
340 | if (!rn) { | |
341 | zlog_warn("%s: Route node doesn't exist", __PRETTY_FUNCTION__); | |
342 | return 0; | |
343 | } | |
344 | ||
345 | rp_info = (struct rp_info *)rn->info; | |
346 | ||
347 | if (!rp_info) { | |
348 | route_unlock_node(rn); | |
349 | return 0; | |
350 | } | |
351 | ||
352 | if (rp_info->rp_src != RP_SRC_STATIC) { | |
353 | /* If new rp available, change it else delete the existing */ | |
354 | if (bsrp) { | |
355 | bsrp_addr = bsrp->rp_address; | |
356 | pim_g2rp_timer_start( | |
357 | bsrp, (bsrp->rp_holdtime - bsrp->elapse_time)); | |
358 | pim_rp_change(pim, bsrp_addr, bsgrp_node->group, | |
359 | RP_SRC_BSR); | |
360 | } else { | |
361 | pim_rp_del(pim, bsrp_addr, bsgrp_node->group, NULL, | |
362 | RP_SRC_BSR); | |
363 | } | |
364 | } | |
365 | ||
366 | if ((!bsgrp_node->bsrp_list->count) | |
367 | && (!bsgrp_node->partial_bsrp_list->count)) { | |
368 | pim_free_bsgrp_node(pim->global_scope.bsrp_table, | |
369 | &bsgrp_node->group); | |
370 | pim_free_bsgrp_data(bsgrp_node); | |
371 | } | |
372 | ||
a5164e97 | 373 | return 0; |
374 | } | |
375 | ||
376 | static void pim_g2rp_timer_start(struct bsm_rpinfo *bsrp, int hold_time) | |
377 | { | |
378 | if (!bsrp) { | |
379 | if (PIM_DEBUG_BSM) | |
380 | zlog_debug("%s : Invalid brsp(NULL).", | |
381 | __PRETTY_FUNCTION__); | |
382 | return; | |
383 | } | |
384 | THREAD_OFF(bsrp->g2rp_timer); | |
385 | if (PIM_DEBUG_BSM) { | |
386 | char buf[48]; | |
387 | ||
388 | zlog_debug( | |
389 | "%s : starting g2rp timer for grp: %s - rp: %s with timeout %d secs(Actual Hold time : %d secs)", | |
390 | __PRETTY_FUNCTION__, | |
391 | prefix2str(&bsrp->bsgrp_node->group, buf, 48), | |
392 | inet_ntoa(bsrp->rp_address), hold_time, | |
393 | bsrp->rp_holdtime); | |
394 | } | |
395 | ||
396 | thread_add_timer(router->master, pim_on_g2rp_timer, bsrp, hold_time, | |
397 | &bsrp->g2rp_timer); | |
398 | } | |
399 | ||
400 | static inline void pim_g2rp_timer_restart(struct bsm_rpinfo *bsrp, | |
401 | int hold_time) | |
402 | { | |
403 | pim_g2rp_timer_start(bsrp, hold_time); | |
404 | } | |
405 | ||
20fd30e5 | 406 | static void pim_g2rp_timer_stop(struct bsm_rpinfo *bsrp) |
407 | { | |
408 | if (!bsrp) | |
409 | return; | |
410 | ||
411 | if (PIM_DEBUG_BSM) { | |
412 | char buf[48]; | |
413 | ||
414 | zlog_debug("%s : stopping g2rp timer for grp: %s - rp: %s", | |
415 | __PRETTY_FUNCTION__, | |
416 | prefix2str(&bsrp->bsgrp_node->group, buf, 48), | |
417 | inet_ntoa(bsrp->rp_address)); | |
418 | } | |
419 | ||
420 | THREAD_OFF(bsrp->g2rp_timer); | |
421 | } | |
422 | ||
423 | static bool is_hold_time_zero(void *data) | |
424 | { | |
425 | struct bsm_rpinfo *bsrp; | |
426 | ||
427 | bsrp = data; | |
428 | ||
429 | if (bsrp->rp_holdtime) | |
430 | return false; | |
431 | else | |
432 | return true; | |
433 | } | |
434 | ||
435 | static void pim_instate_pend_list(struct bsgrp_node *bsgrp_node) | |
436 | { | |
437 | struct bsm_rpinfo *active; | |
438 | struct bsm_rpinfo *pend; | |
439 | struct list *temp; | |
440 | struct rp_info *rp_info; | |
441 | struct route_node *rn; | |
442 | struct pim_instance *pim; | |
443 | struct rp_info *rp_all; | |
444 | struct prefix group_all; | |
445 | bool had_rp_node = true; | |
446 | ||
447 | pim = bsgrp_node->scope->pim; | |
448 | active = listnode_head(bsgrp_node->bsrp_list); | |
449 | ||
450 | /* Remove nodes with hold time 0 & check if list still has a head */ | |
451 | list_filter_out_nodes(bsgrp_node->partial_bsrp_list, is_hold_time_zero); | |
452 | pend = listnode_head(bsgrp_node->partial_bsrp_list); | |
453 | ||
454 | if (!str2prefix("224.0.0.0/4", &group_all)) | |
455 | return; | |
456 | ||
457 | rp_all = pim_rp_find_match_group(pim, &group_all); | |
458 | rn = route_node_lookup(pim->rp_table, &bsgrp_node->group); | |
459 | ||
460 | if (pend) | |
461 | pim_g2rp_timer_start(pend, pend->rp_holdtime); | |
462 | ||
463 | /* if rp node doesn't exist or exist but not configured(rp_all), | |
464 | * install the rp from head(if exists) of partial list. List is | |
465 | * is sorted such that head is the elected RP for the group. | |
466 | */ | |
467 | if (!rn || (prefix_same(&rp_all->group, &bsgrp_node->group) | |
468 | && pim_rpf_addr_is_inaddr_none(&rp_all->rp))) { | |
469 | if (PIM_DEBUG_BSM) | |
470 | zlog_debug("%s: Route node doesn't exist", | |
471 | __PRETTY_FUNCTION__); | |
472 | if (pend) | |
473 | pim_rp_new(pim, pend->rp_address, bsgrp_node->group, | |
474 | NULL, RP_SRC_BSR); | |
475 | had_rp_node = false; | |
476 | } else { | |
477 | rp_info = (struct rp_info *)rn->info; | |
478 | if (!rp_info) { | |
479 | route_unlock_node(rn); | |
480 | if (pend) | |
481 | pim_rp_new(pim, pend->rp_address, | |
482 | bsgrp_node->group, NULL, RP_SRC_BSR); | |
483 | had_rp_node = false; | |
484 | } | |
485 | } | |
486 | ||
487 | /* We didn't have rp node and pending list is empty(unlikely), cleanup*/ | |
488 | if ((!had_rp_node) && (!pend)) { | |
489 | pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table, | |
490 | &bsgrp_node->group); | |
491 | pim_free_bsgrp_data(bsgrp_node); | |
492 | return; | |
493 | } | |
494 | ||
495 | if ((had_rp_node) && (rp_info->rp_src != RP_SRC_STATIC)) { | |
496 | /* This means we searched and got rp node, needs unlock */ | |
497 | route_unlock_node(rn); | |
498 | ||
499 | if (active && pend) { | |
500 | if ((active->rp_address.s_addr | |
501 | != pend->rp_address.s_addr)) | |
502 | pim_rp_change(pim, pend->rp_address, | |
503 | bsgrp_node->group, RP_SRC_BSR); | |
504 | } | |
505 | ||
506 | /* Possible when the first BSM has group with 0 rp count */ | |
507 | if ((!active) && (!pend)) { | |
508 | if (PIM_DEBUG_BSM) { | |
509 | zlog_debug( | |
510 | "%s: Both bsrp and partial list are empty", | |
511 | __PRETTY_FUNCTION__); | |
512 | } | |
513 | pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table, | |
514 | &bsgrp_node->group); | |
515 | pim_free_bsgrp_data(bsgrp_node); | |
516 | return; | |
517 | } | |
518 | ||
519 | /* Possible when a group with 0 rp count received in BSM */ | |
520 | if ((active) && (!pend)) { | |
521 | pim_rp_del(pim, active->rp_address, bsgrp_node->group, | |
522 | NULL, RP_SRC_BSR); | |
523 | pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table, | |
524 | &bsgrp_node->group); | |
525 | if (PIM_DEBUG_BSM) { | |
526 | zlog_debug("%s:Pend List is null,del grp node", | |
527 | __PRETTY_FUNCTION__); | |
528 | } | |
529 | pim_free_bsgrp_data(bsgrp_node); | |
530 | return; | |
531 | } | |
532 | } | |
533 | ||
534 | if ((had_rp_node) && (rp_info->rp_src == RP_SRC_STATIC)) { | |
535 | /* We need to unlock rn this case */ | |
536 | route_unlock_node(rn); | |
537 | /* there is a chance that static rp exist and bsrp cleaned | |
538 | * so clean bsgrp node if pending list empty | |
539 | */ | |
540 | if (!pend) { | |
541 | if (PIM_DEBUG_BSM) | |
542 | zlog_debug( | |
543 | "%s: Partial list is empty, static rp exists", | |
544 | __PRETTY_FUNCTION__); | |
545 | pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table, | |
546 | &bsgrp_node->group); | |
547 | pim_free_bsgrp_data(bsgrp_node); | |
548 | return; | |
549 | } | |
550 | } | |
551 | ||
552 | /* swap the list & delete all nodes in partial list (old bsrp_list) | |
553 | * before swap | |
554 | * active is head of bsrp list | |
555 | * pend is head of partial list | |
556 | * After swap | |
557 | * active is head of partial list | |
558 | * pend is head of bsrp list | |
559 | * So check appriate head after swap and clean the new partial list | |
560 | */ | |
561 | temp = bsgrp_node->bsrp_list; | |
562 | bsgrp_node->bsrp_list = bsgrp_node->partial_bsrp_list; | |
563 | bsgrp_node->partial_bsrp_list = temp; | |
564 | ||
565 | if (active) { | |
566 | pim_g2rp_timer_stop(active); | |
567 | list_delete_all_node(bsgrp_node->partial_bsrp_list); | |
568 | } | |
569 | } | |
570 | ||
5acde1cf | 571 | static bool pim_bsr_rpf_check(struct pim_instance *pim, struct in_addr bsr, |
572 | struct in_addr ip_src_addr) | |
573 | { | |
574 | struct pim_nexthop nexthop; | |
575 | int result; | |
576 | ||
577 | memset(&nexthop, 0, sizeof(nexthop)); | |
578 | ||
579 | /* New BSR recived */ | |
580 | if (bsr.s_addr != pim->global_scope.current_bsr.s_addr) { | |
581 | result = pim_nexthop_match(pim, bsr, ip_src_addr); | |
582 | ||
583 | /* Nexthop lookup pass for the new BSR address */ | |
584 | if (result) | |
585 | return true; | |
586 | ||
587 | if (PIM_DEBUG_BSM) { | |
588 | char bsr_str[INET_ADDRSTRLEN]; | |
589 | ||
590 | pim_inet4_dump("<bsr?>", bsr, bsr_str, sizeof(bsr_str)); | |
591 | zlog_debug("%s : No route to BSR address %s", | |
592 | __PRETTY_FUNCTION__, bsr_str); | |
593 | } | |
594 | return false; | |
595 | } | |
596 | ||
597 | return pim_nexthop_match_nht_cache(pim, bsr, ip_src_addr); | |
598 | } | |
599 | ||
600 | static bool is_preferred_bsr(struct pim_instance *pim, struct in_addr bsr, | |
601 | uint32_t bsr_prio) | |
602 | { | |
603 | if (bsr.s_addr == pim->global_scope.current_bsr.s_addr) | |
604 | return true; | |
605 | ||
606 | if (bsr_prio > pim->global_scope.current_bsr_prio) | |
607 | return true; | |
608 | ||
609 | else if (bsr_prio == pim->global_scope.current_bsr_prio) { | |
610 | if (bsr.s_addr >= pim->global_scope.current_bsr.s_addr) | |
611 | return true; | |
612 | else | |
613 | return false; | |
614 | } else | |
615 | return false; | |
616 | } | |
617 | ||
618 | static void pim_bsm_update(struct pim_instance *pim, struct in_addr bsr, | |
619 | uint32_t bsr_prio) | |
620 | { | |
621 | struct pim_nexthop_cache pnc; | |
622 | ||
623 | if (bsr.s_addr != pim->global_scope.current_bsr.s_addr) { | |
624 | struct prefix nht_p; | |
625 | char buf[PREFIX2STR_BUFFER]; | |
626 | bool is_bsr_tracking = true; | |
627 | ||
628 | /* De-register old BSR and register new BSR with Zebra NHT */ | |
629 | nht_p.family = AF_INET; | |
630 | nht_p.prefixlen = IPV4_MAX_BITLEN; | |
631 | ||
632 | if (pim->global_scope.current_bsr.s_addr != INADDR_ANY) { | |
633 | nht_p.u.prefix4 = pim->global_scope.current_bsr; | |
634 | if (PIM_DEBUG_BSM) { | |
635 | prefix2str(&nht_p, buf, sizeof(buf)); | |
636 | zlog_debug( | |
637 | "%s: Deregister BSR addr %s with Zebra NHT", | |
638 | __PRETTY_FUNCTION__, buf); | |
639 | } | |
640 | pim_delete_tracked_nexthop(pim, &nht_p, NULL, NULL, | |
641 | is_bsr_tracking); | |
642 | } | |
643 | ||
644 | nht_p.u.prefix4 = bsr; | |
645 | if (PIM_DEBUG_BSM) { | |
646 | prefix2str(&nht_p, buf, sizeof(buf)); | |
647 | zlog_debug( | |
648 | "%s: NHT Register BSR addr %s with Zebra NHT", | |
649 | __PRETTY_FUNCTION__, buf); | |
650 | } | |
651 | ||
652 | memset(&pnc, 0, sizeof(struct pim_nexthop_cache)); | |
653 | pim_find_or_track_nexthop(pim, &nht_p, NULL, NULL, | |
654 | is_bsr_tracking, &pnc); | |
655 | pim->global_scope.current_bsr = bsr; | |
656 | pim->global_scope.current_bsr_first_ts = | |
657 | pim_time_monotonic_sec(); | |
658 | pim->global_scope.state = ACCEPT_PREFERRED; | |
659 | } | |
660 | pim->global_scope.current_bsr_prio = bsr_prio; | |
661 | pim->global_scope.current_bsr_last_ts = pim_time_monotonic_sec(); | |
662 | } | |
663 | ||
79d97386 | 664 | static bool pim_bsm_send_intf(uint8_t *buf, int len, struct interface *ifp, |
665 | struct in_addr dst_addr) | |
666 | { | |
667 | struct pim_interface *pim_ifp; | |
668 | ||
669 | pim_ifp = ifp->info; | |
670 | ||
671 | if (!pim_ifp) { | |
672 | if (PIM_DEBUG_BSM) | |
673 | zlog_debug("%s: Pim interface not available for %s", | |
674 | __PRETTY_FUNCTION__, ifp->name); | |
675 | return false; | |
676 | } | |
677 | ||
678 | if (pim_ifp->pim_sock_fd == -1) { | |
679 | if (PIM_DEBUG_BSM) | |
680 | zlog_debug("%s: Pim sock not available for %s", | |
681 | __PRETTY_FUNCTION__, ifp->name); | |
682 | return false; | |
683 | } | |
684 | ||
3bb29c4e DS |
685 | if (pim_msg_send(pim_ifp->pim_sock_fd, pim_ifp->primary_address, |
686 | dst_addr, buf, len, ifp->name)) { | |
687 | zlog_warn("%s: Could not send BSM message on interface: %s", | |
688 | __PRETTY_FUNCTION__, ifp->name); | |
689 | return false; | |
690 | } | |
691 | ||
79d97386 | 692 | pim_ifp->pim_ifstat_bsm_tx++; |
693 | pim_ifp->pim->bsm_sent++; | |
694 | return true; | |
695 | } | |
696 | ||
40270c35 | 697 | static bool pim_bsm_frag_send(uint8_t *buf, uint32_t len, struct interface *ifp, |
698 | uint32_t pim_mtu, struct in_addr dst_addr, | |
699 | bool no_fwd) | |
700 | { | |
701 | struct bsmmsg_grpinfo *grpinfo, *curgrp; | |
702 | uint8_t *firstgrp_ptr; | |
703 | uint8_t *pkt; | |
704 | uint8_t *pak_start; | |
705 | uint32_t parsed_len = 0; | |
706 | uint32_t this_pkt_rem; | |
707 | uint32_t copy_byte_count; | |
708 | uint32_t this_pkt_len; | |
709 | uint8_t total_rp_cnt; | |
710 | uint8_t this_rp_cnt; | |
711 | uint8_t frag_rp_cnt; | |
712 | uint8_t rp_fit_cnt; | |
713 | bool pak_pending = false; | |
714 | ||
715 | /* MTU passed here is PIM MTU (IP MTU less IP Hdr) */ | |
716 | if (pim_mtu < (PIM_MIN_BSM_LEN)) { | |
717 | zlog_warn( | |
f79f7a7b | 718 | "%s: mtu(pim mtu: %d) size less than minimum bootstrap len", |
40270c35 | 719 | __PRETTY_FUNCTION__, pim_mtu); |
720 | if (PIM_DEBUG_BSM) | |
721 | zlog_debug( | |
f79f7a7b | 722 | "%s: mtu (pim mtu:%d) less than minimum bootstrap len", |
40270c35 | 723 | __PRETTY_FUNCTION__, pim_mtu); |
724 | return false; | |
725 | } | |
726 | ||
727 | pak_start = XCALLOC(MTYPE_PIM_BSM_PKT_VAR_MEM, pim_mtu); | |
728 | ||
40270c35 | 729 | pkt = pak_start; |
730 | ||
731 | /* Fill PIM header later before sending packet to calc checksum */ | |
732 | pkt += PIM_MSG_HEADER_LEN; | |
733 | buf += PIM_MSG_HEADER_LEN; | |
734 | ||
735 | /* copy bsm header to new packet at offset of pim hdr */ | |
736 | memcpy(pkt, buf, PIM_BSM_HDR_LEN); | |
737 | pkt += PIM_BSM_HDR_LEN; | |
738 | buf += PIM_BSM_HDR_LEN; | |
739 | parsed_len += (PIM_MSG_HEADER_LEN + PIM_BSM_HDR_LEN); | |
740 | ||
741 | /* Store the position of first grp ptr, which can be reused for | |
742 | * next packet to start filling group. old bsm header and pim hdr | |
743 | * remains. So need not be filled again for next packet onwards. | |
744 | */ | |
745 | firstgrp_ptr = pkt; | |
746 | ||
747 | /* we received mtu excluding IP hdr len as param | |
748 | * now this_pkt_rem is mtu excluding | |
749 | * PIM_BSM_HDR_LEN + PIM_MSG_HEADER_LEN | |
750 | */ | |
751 | this_pkt_rem = pim_mtu - (PIM_BSM_HDR_LEN + PIM_MSG_HEADER_LEN); | |
752 | ||
753 | /* For each group till the packet length parsed */ | |
754 | while (parsed_len < len) { | |
755 | /* pkt ---> fragment's current pointer | |
756 | * buf ---> input buffer's current pointer | |
757 | * mtu ---> size of the pim packet - PIM header | |
758 | * curgrp ---> current group on the fragment | |
759 | * grpinfo ---> current group on the input buffer | |
760 | * this_pkt_rem ---> bytes remaing on the current fragment | |
761 | * rp_fit_cnt ---> num of rp for current grp that | |
762 | * fits this frag | |
763 | * total_rp_cnt ---> total rp present for the group in the buf | |
764 | * frag_rp_cnt ---> no of rp for the group to be fit in | |
765 | * the frag | |
766 | * this_rp_cnt ---> how many rp have we parsed | |
767 | */ | |
768 | grpinfo = (struct bsmmsg_grpinfo *)buf; | |
769 | memcpy(pkt, buf, PIM_BSM_GRP_LEN); | |
770 | curgrp = (struct bsmmsg_grpinfo *)pkt; | |
771 | parsed_len += PIM_BSM_GRP_LEN; | |
772 | pkt += PIM_BSM_GRP_LEN; | |
773 | buf += PIM_BSM_GRP_LEN; | |
774 | this_pkt_rem -= PIM_BSM_GRP_LEN; | |
775 | ||
776 | /* initialize rp count and total_rp_cnt before the rp loop */ | |
777 | this_rp_cnt = 0; | |
778 | total_rp_cnt = grpinfo->frag_rp_count; | |
779 | ||
780 | /* Loop till all RPs for the group parsed */ | |
781 | while (this_rp_cnt < total_rp_cnt) { | |
782 | /* All RP from a group processed here. | |
783 | * group is pointed by grpinfo. | |
784 | * At this point make sure buf pointing to a RP | |
785 | * within a group | |
786 | */ | |
787 | rp_fit_cnt = this_pkt_rem / PIM_BSM_RP_LEN; | |
788 | ||
789 | /* calculate how many rp am i going to copy in | |
790 | * this frag | |
791 | */ | |
792 | if (rp_fit_cnt > (total_rp_cnt - this_rp_cnt)) | |
793 | frag_rp_cnt = total_rp_cnt - this_rp_cnt; | |
794 | else | |
795 | frag_rp_cnt = rp_fit_cnt; | |
796 | ||
797 | /* populate the frag rp count for the current grp */ | |
798 | curgrp->frag_rp_count = frag_rp_cnt; | |
799 | copy_byte_count = frag_rp_cnt * PIM_BSM_RP_LEN; | |
800 | ||
801 | /* copy all the rp that we are fitting in this | |
802 | * frag for the grp | |
803 | */ | |
804 | memcpy(pkt, buf, copy_byte_count); | |
805 | this_rp_cnt += frag_rp_cnt; | |
806 | buf += copy_byte_count; | |
807 | pkt += copy_byte_count; | |
808 | parsed_len += copy_byte_count; | |
809 | this_pkt_rem -= copy_byte_count; | |
810 | ||
811 | /* Either we couldn't fit all rp for the group or the | |
812 | * mtu reached | |
813 | */ | |
814 | if ((this_rp_cnt < total_rp_cnt) | |
815 | || (this_pkt_rem | |
816 | < (PIM_BSM_GRP_LEN + PIM_BSM_RP_LEN))) { | |
817 | /* No space to fit in more rp, send this pkt */ | |
818 | this_pkt_len = pim_mtu - this_pkt_rem; | |
819 | pim_msg_build_header(pak_start, this_pkt_len, | |
820 | PIM_MSG_TYPE_BOOTSTRAP, | |
821 | no_fwd); | |
822 | pim_bsm_send_intf(pak_start, this_pkt_len, ifp, | |
823 | dst_addr); | |
824 | ||
825 | /* Construct next fragment. Reuse old packet */ | |
826 | pkt = firstgrp_ptr; | |
827 | this_pkt_rem = pim_mtu - (PIM_BSM_HDR_LEN | |
828 | + PIM_MSG_HEADER_LEN); | |
829 | ||
830 | /* If pkt can't accomodate next group + atleast | |
831 | * one rp, we must break out of this inner loop | |
832 | * and process next RP | |
833 | */ | |
834 | if (total_rp_cnt == this_rp_cnt) | |
835 | break; | |
836 | ||
837 | /* If some more RPs for the same group pending, | |
838 | * fill grp hdr | |
839 | */ | |
840 | memcpy(pkt, (uint8_t *)grpinfo, | |
841 | PIM_BSM_GRP_LEN); | |
842 | curgrp = (struct bsmmsg_grpinfo *)pkt; | |
843 | pkt += PIM_BSM_GRP_LEN; | |
844 | this_pkt_rem -= PIM_BSM_GRP_LEN; | |
845 | pak_pending = false; | |
846 | } else { | |
847 | /* We filled something but not yet sent out */ | |
848 | pak_pending = true; | |
849 | } | |
850 | } /* while RP count */ | |
851 | } /*while parsed len */ | |
852 | ||
853 | /* Send if we have any unsent packet */ | |
854 | if (pak_pending) { | |
855 | this_pkt_len = pim_mtu - this_pkt_rem; | |
856 | pim_msg_build_header(pak_start, this_pkt_len, | |
857 | PIM_MSG_TYPE_BOOTSTRAP, no_fwd); | |
858 | pim_bsm_send_intf(pak_start, (pim_mtu - this_pkt_rem), ifp, | |
859 | dst_addr); | |
860 | } | |
861 | XFREE(MTYPE_PIM_BSM_PKT_VAR_MEM, pak_start); | |
862 | return true; | |
863 | } | |
864 | ||
79d97386 | 865 | static void pim_bsm_fwd_whole_sz(struct pim_instance *pim, uint8_t *buf, |
866 | uint32_t len, int sz) | |
867 | { | |
868 | struct interface *ifp; | |
869 | struct pim_interface *pim_ifp; | |
870 | struct in_addr dst_addr; | |
871 | uint32_t pim_mtu; | |
2951a7a4 QY |
872 | bool no_fwd = false; |
873 | bool ret = false; | |
79d97386 | 874 | |
875 | /* For now only global scope zone is supported, so send on all | |
876 | * pim interfaces in the vrf | |
877 | */ | |
878 | dst_addr = qpim_all_pim_routers_addr; | |
879 | FOR_ALL_INTERFACES (pim->vrf, ifp) { | |
880 | pim_ifp = ifp->info; | |
881 | if ((!pim_ifp) || (!pim_ifp->bsm_enable)) | |
882 | continue; | |
883 | pim_hello_require(ifp); | |
884 | pim_mtu = ifp->mtu - MAX_IP_HDR_LEN; | |
885 | if (pim_mtu < len) { | |
40270c35 | 886 | ret = pim_bsm_frag_send(buf, len, ifp, pim_mtu, |
887 | dst_addr, no_fwd); | |
888 | if (PIM_DEBUG_BSM) | |
889 | zlog_debug("%s: pim_bsm_frag_send returned %s", | |
890 | __PRETTY_FUNCTION__, | |
891 | ret ? "TRUE" : "FALSE"); | |
79d97386 | 892 | } else { |
893 | pim_msg_build_header(buf, len, PIM_MSG_TYPE_BOOTSTRAP, | |
894 | no_fwd); | |
895 | if (!pim_bsm_send_intf(buf, len, ifp, dst_addr)) { | |
896 | if (PIM_DEBUG_BSM) | |
897 | zlog_debug( | |
2951a7a4 | 898 | "%s: pim_bsm_send_intf returned false", |
79d97386 | 899 | __PRETTY_FUNCTION__); |
900 | } | |
901 | } | |
902 | } | |
903 | } | |
904 | ||
6bb2ef35 | 905 | bool pim_bsm_new_nbr_fwd(struct pim_neighbor *neigh, struct interface *ifp) |
906 | { | |
907 | struct in_addr dst_addr; | |
908 | struct pim_interface *pim_ifp; | |
909 | struct bsm_scope *scope; | |
910 | struct listnode *bsm_ln; | |
911 | struct bsm_info *bsminfo; | |
912 | char neigh_src_str[INET_ADDRSTRLEN]; | |
913 | uint32_t pim_mtu; | |
914 | bool no_fwd = true; | |
915 | bool ret = false; | |
916 | ||
917 | if (PIM_DEBUG_BSM) { | |
918 | pim_inet4_dump("<src?>", neigh->source_addr, neigh_src_str, | |
919 | sizeof(neigh_src_str)); | |
920 | zlog_debug("%s: New neighbor %s seen on %s", | |
921 | __PRETTY_FUNCTION__, neigh_src_str, ifp->name); | |
922 | } | |
923 | ||
924 | pim_ifp = ifp->info; | |
925 | ||
926 | /* DR only forwards BSM packet */ | |
927 | if (pim_ifp->pim_dr_addr.s_addr == pim_ifp->primary_address.s_addr) { | |
928 | if (PIM_DEBUG_BSM) | |
929 | zlog_debug( | |
930 | "%s: It is not DR, so don't forward BSM packet", | |
931 | __PRETTY_FUNCTION__); | |
932 | } | |
933 | ||
934 | if (!pim_ifp->bsm_enable) { | |
935 | if (PIM_DEBUG_BSM) | |
936 | zlog_debug("%s: BSM proc not enabled on %s", | |
937 | __PRETTY_FUNCTION__, ifp->name); | |
938 | return ret; | |
939 | } | |
940 | ||
941 | scope = &pim_ifp->pim->global_scope; | |
942 | ||
943 | if (!scope->bsm_list->count) { | |
944 | if (PIM_DEBUG_BSM) | |
945 | zlog_debug("%s: BSM list for the scope is empty", | |
946 | __PRETTY_FUNCTION__); | |
947 | return ret; | |
948 | } | |
949 | ||
950 | if (!pim_ifp->ucast_bsm_accept) { | |
951 | dst_addr = qpim_all_pim_routers_addr; | |
952 | if (PIM_DEBUG_BSM) | |
953 | zlog_debug("%s: Sending BSM mcast to %s", | |
954 | __PRETTY_FUNCTION__, neigh_src_str); | |
955 | } else { | |
956 | dst_addr = neigh->source_addr; | |
957 | if (PIM_DEBUG_BSM) | |
958 | zlog_debug("%s: Sending BSM ucast to %s", | |
959 | __PRETTY_FUNCTION__, neigh_src_str); | |
960 | } | |
961 | pim_mtu = ifp->mtu - MAX_IP_HDR_LEN; | |
962 | pim_hello_require(ifp); | |
963 | ||
964 | for (ALL_LIST_ELEMENTS_RO(scope->bsm_list, bsm_ln, bsminfo)) { | |
965 | if (pim_mtu < bsminfo->size) { | |
966 | ret = pim_bsm_frag_send(bsminfo->bsm, bsminfo->size, | |
967 | ifp, pim_mtu, dst_addr, no_fwd); | |
968 | if (!ret) { | |
969 | if (PIM_DEBUG_BSM) | |
970 | zlog_debug( | |
971 | "%s: pim_bsm_frag_send failed", | |
972 | __PRETTY_FUNCTION__); | |
973 | } | |
974 | } else { | |
975 | /* Pim header needs to be constructed */ | |
976 | pim_msg_build_header(bsminfo->bsm, bsminfo->size, | |
977 | PIM_MSG_TYPE_BOOTSTRAP, no_fwd); | |
978 | ret = pim_bsm_send_intf(bsminfo->bsm, bsminfo->size, | |
979 | ifp, dst_addr); | |
980 | if (!ret) { | |
981 | if (PIM_DEBUG_BSM) | |
982 | zlog_debug( | |
983 | "%s: pim_bsm_frag_send failed", | |
984 | __PRETTY_FUNCTION__); | |
985 | } | |
986 | } | |
987 | } | |
988 | return ret; | |
989 | } | |
990 | ||
d0e418b4 | 991 | struct bsgrp_node *pim_bsm_get_bsgrp_node(struct bsm_scope *scope, |
992 | struct prefix *grp) | |
993 | { | |
994 | struct route_node *rn; | |
995 | struct bsgrp_node *bsgrp; | |
996 | ||
997 | rn = route_node_lookup(scope->bsrp_table, grp); | |
998 | if (!rn) { | |
999 | if (PIM_DEBUG_BSM) | |
1000 | zlog_debug("%s: Route node doesn't exist for the group", | |
1001 | __PRETTY_FUNCTION__); | |
1002 | return NULL; | |
1003 | } | |
1004 | bsgrp = rn->info; | |
1005 | route_unlock_node(rn); | |
1006 | ||
1007 | return bsgrp; | |
1008 | } | |
5acde1cf | 1009 | |
7b3e6ba1 | 1010 | static uint32_t hash_calc_on_grp_rp(struct prefix group, struct in_addr rp, |
1011 | uint8_t hashmasklen) | |
1012 | { | |
1013 | uint64_t temp; | |
1014 | uint32_t hash; | |
1015 | uint32_t grpaddr; | |
1016 | uint32_t rp_add; | |
1017 | uint32_t mask = 0xffffffff; | |
1018 | ||
1019 | /* mask to be made zero if hashmasklen is 0 because mask << 32 | |
1020 | * may not give 0. hashmasklen can be 0 to 32. | |
1021 | */ | |
1022 | if (hashmasklen == 0) | |
1023 | mask = 0; | |
1024 | ||
1025 | /* in_addr stores ip in big endian, hence network byte order | |
1026 | * convert to uint32 before processing hash | |
1027 | */ | |
1028 | grpaddr = ntohl(group.u.prefix4.s_addr); | |
1029 | /* Avoid shifting by 32 bit on a 32 bit register */ | |
1030 | if (hashmasklen) | |
1031 | grpaddr = grpaddr & ((mask << (32 - hashmasklen))); | |
1032 | else | |
1033 | grpaddr = grpaddr & mask; | |
1034 | rp_add = ntohl(rp.s_addr); | |
29f7fc87 DS |
1035 | temp = 1103515245 * ((1103515245 * (uint64_t)grpaddr + 12345) ^ rp_add) |
1036 | + 12345; | |
7b3e6ba1 | 1037 | hash = temp & (0x7fffffff); |
1038 | return hash; | |
1039 | } | |
1040 | ||
1041 | static bool pim_install_bsm_grp_rp(struct pim_instance *pim, | |
1042 | struct bsgrp_node *grpnode, | |
1043 | struct bsmmsg_rpinfo *rp) | |
1044 | { | |
1045 | struct bsm_rpinfo *bsm_rpinfo; | |
1046 | uint8_t hashMask_len = pim->global_scope.hashMasklen; | |
1047 | ||
1048 | /*memory allocation for bsm_rpinfo */ | |
1049 | bsm_rpinfo = XCALLOC(MTYPE_PIM_BSRP_NODE, sizeof(*bsm_rpinfo)); | |
1050 | ||
7b3e6ba1 | 1051 | bsm_rpinfo->rp_prio = rp->rp_pri; |
1052 | bsm_rpinfo->rp_holdtime = rp->rp_holdtime; | |
1053 | memcpy(&bsm_rpinfo->rp_address, &rp->rpaddr.addr, | |
1054 | sizeof(struct in_addr)); | |
1055 | bsm_rpinfo->elapse_time = 0; | |
1056 | ||
1057 | /* Back pointer to the group node. */ | |
1058 | bsm_rpinfo->bsgrp_node = grpnode; | |
1059 | ||
1060 | /* update hash for this rp node */ | |
1061 | bsm_rpinfo->hash = hash_calc_on_grp_rp(grpnode->group, rp->rpaddr.addr, | |
1062 | hashMask_len); | |
1063 | if (listnode_add_sort_nodup(grpnode->partial_bsrp_list, bsm_rpinfo)) { | |
1064 | if (PIM_DEBUG_BSM) | |
1065 | zlog_debug( | |
1066 | "%s, bs_rpinfo node added to the partial bs_rplist.\r\n", | |
1067 | __PRETTY_FUNCTION__); | |
1068 | return true; | |
1069 | } | |
1070 | ||
1071 | if (PIM_DEBUG_BSM) | |
1072 | zlog_debug("%s: list node not added\n", __PRETTY_FUNCTION__); | |
1073 | ||
1074 | XFREE(MTYPE_PIM_BSRP_NODE, bsm_rpinfo); | |
1075 | return false; | |
1076 | } | |
1077 | ||
1078 | static void pim_update_pending_rp_cnt(struct bsm_scope *sz, | |
1079 | struct bsgrp_node *bsgrp, | |
1080 | uint16_t bsm_frag_tag, | |
1081 | uint32_t total_rp_count) | |
1082 | { | |
1083 | if (bsgrp->pend_rp_cnt) { | |
1084 | /* received bsm is different packet , | |
1085 | * it is not same fragment. | |
1086 | */ | |
1087 | if (bsm_frag_tag != bsgrp->frag_tag) { | |
1088 | if (PIM_DEBUG_BSM) | |
1089 | zlog_debug( | |
1090 | "%s,Received a new BSM ,so clear the pending bs_rpinfo list.\r\n", | |
1091 | __PRETTY_FUNCTION__); | |
1092 | list_delete_all_node(bsgrp->partial_bsrp_list); | |
1093 | bsgrp->pend_rp_cnt = total_rp_count; | |
1094 | } | |
1095 | } else | |
1096 | bsgrp->pend_rp_cnt = total_rp_count; | |
1097 | ||
1098 | bsgrp->frag_tag = bsm_frag_tag; | |
1099 | } | |
1100 | ||
1101 | /* Parsing BSR packet and adding to partial list of corresponding bsgrp node */ | |
1102 | static bool pim_bsm_parse_install_g2rp(struct bsm_scope *scope, uint8_t *buf, | |
1103 | int buflen, uint16_t bsm_frag_tag) | |
1104 | { | |
1105 | struct bsmmsg_grpinfo grpinfo; | |
1106 | struct bsmmsg_rpinfo rpinfo; | |
1107 | struct prefix group; | |
1108 | struct bsgrp_node *bsgrp = NULL; | |
1109 | int frag_rp_cnt = 0; | |
1110 | int offset = 0; | |
1111 | int ins_count = 0; | |
1112 | ||
1113 | while (buflen > offset) { | |
b1945363 DS |
1114 | if (offset + (int)sizeof(struct bsmmsg_grpinfo) > buflen) { |
1115 | if (PIM_DEBUG_BSM) | |
1116 | zlog_debug( | |
1117 | "%s: buflen received %d is less than the internal data structure of the packet would suggest", | |
1118 | __PRETTY_FUNCTION__, buflen); | |
1119 | return false; | |
1120 | } | |
7b3e6ba1 | 1121 | /* Extract Group tlv from BSM */ |
1122 | memcpy(&grpinfo, buf, sizeof(struct bsmmsg_grpinfo)); | |
1123 | ||
1124 | if (PIM_DEBUG_BSM) { | |
1125 | char grp_str[INET_ADDRSTRLEN]; | |
1126 | ||
1127 | pim_inet4_dump("<Group?>", grpinfo.group.addr, grp_str, | |
1128 | sizeof(grp_str)); | |
1129 | zlog_debug( | |
1130 | "%s, Group %s Rpcount:%d Fragment-Rp-count:%d\r\n", | |
1131 | __PRETTY_FUNCTION__, grp_str, grpinfo.rp_count, | |
1132 | grpinfo.frag_rp_count); | |
1133 | } | |
1134 | ||
1135 | buf += sizeof(struct bsmmsg_grpinfo); | |
1136 | offset += sizeof(struct bsmmsg_grpinfo); | |
1137 | ||
1138 | if (grpinfo.rp_count == 0) { | |
1139 | if (PIM_DEBUG_BSM) { | |
1140 | char grp_str[INET_ADDRSTRLEN]; | |
1141 | ||
1142 | pim_inet4_dump("<Group?>", grpinfo.group.addr, | |
1143 | grp_str, sizeof(grp_str)); | |
1144 | zlog_debug( | |
1145 | "%s, Rp count is zero for group: %s\r\n", | |
1146 | __PRETTY_FUNCTION__, grp_str); | |
1147 | } | |
1148 | return false; | |
1149 | } | |
1150 | ||
1151 | group.family = AF_INET; | |
b1945363 DS |
1152 | if (grpinfo.group.mask > IPV4_MAX_BITLEN) { |
1153 | if (PIM_DEBUG_BSM) | |
1154 | zlog_debug("%s, v4 prefix length specified: %d is too long", | |
1155 | __PRETTY_FUNCTION__, grpinfo.group.mask); | |
1156 | return false; | |
1157 | } | |
7b3e6ba1 | 1158 | group.prefixlen = grpinfo.group.mask; |
1159 | group.u.prefix4.s_addr = grpinfo.group.addr.s_addr; | |
1160 | ||
1161 | /* Get the Group node for the BSM rp table */ | |
1162 | bsgrp = pim_bsm_get_bsgrp_node(scope, &group); | |
1163 | ||
1164 | if (!bsgrp) { | |
1165 | if (PIM_DEBUG_BSM) | |
1166 | zlog_debug( | |
1167 | "%s, Create new BSM Group node.\r\n", | |
1168 | __PRETTY_FUNCTION__); | |
1169 | ||
1170 | /* create a new node to be added to the tree. */ | |
1171 | bsgrp = pim_bsm_new_bsgrp_node(scope->bsrp_table, | |
1172 | &group); | |
1173 | ||
1174 | if (!bsgrp) { | |
1175 | zlog_debug( | |
1176 | "%s, Failed to get the BSM group node.\r\n", | |
1177 | __PRETTY_FUNCTION__); | |
1178 | continue; | |
1179 | } | |
1180 | ||
1181 | bsgrp->scope = scope; | |
1182 | } | |
1183 | ||
1184 | pim_update_pending_rp_cnt(scope, bsgrp, bsm_frag_tag, | |
1185 | grpinfo.rp_count); | |
1186 | frag_rp_cnt = grpinfo.frag_rp_count; | |
1187 | ins_count = 0; | |
1188 | ||
1189 | while (frag_rp_cnt--) { | |
b1945363 DS |
1190 | if (offset + (int)sizeof(struct bsmmsg_rpinfo) |
1191 | > buflen) { | |
1192 | if (PIM_DEBUG_BSM) | |
1193 | zlog_debug( | |
1194 | "%s, buflen received: %u is less than the internal data structure of the packet would suggest", | |
1195 | __PRETTY_FUNCTION__, buflen); | |
1196 | return false; | |
1197 | } | |
1198 | ||
7b3e6ba1 | 1199 | /* Extract RP address tlv from BSM */ |
1200 | memcpy(&rpinfo, buf, sizeof(struct bsmmsg_rpinfo)); | |
1201 | rpinfo.rp_holdtime = ntohs(rpinfo.rp_holdtime); | |
1202 | buf += sizeof(struct bsmmsg_rpinfo); | |
1203 | offset += sizeof(struct bsmmsg_rpinfo); | |
1204 | ||
1205 | if (PIM_DEBUG_BSM) { | |
1206 | char rp_str[INET_ADDRSTRLEN]; | |
1207 | ||
1208 | pim_inet4_dump("<Rpaddr?>", rpinfo.rpaddr.addr, | |
1209 | rp_str, sizeof(rp_str)); | |
1210 | zlog_debug( | |
1211 | "%s, Rp address - %s; pri:%d hold:%d\r\n", | |
1212 | __PRETTY_FUNCTION__, rp_str, | |
1213 | rpinfo.rp_pri, rpinfo.rp_holdtime); | |
1214 | } | |
1215 | ||
1216 | /* Call Install api to update grp-rp mappings */ | |
1217 | if (pim_install_bsm_grp_rp(scope->pim, bsgrp, &rpinfo)) | |
1218 | ins_count++; | |
1219 | } | |
1220 | ||
1221 | bsgrp->pend_rp_cnt -= ins_count; | |
1222 | ||
1223 | if (!bsgrp->pend_rp_cnt) { | |
1224 | if (PIM_DEBUG_BSM) | |
1225 | zlog_debug( | |
1226 | "%s, Recvd all the rps for this group, so bsrp list with penidng rp list.", | |
1227 | __PRETTY_FUNCTION__); | |
20fd30e5 | 1228 | /* replace the bsrp_list with pending list */ |
1229 | pim_instate_pend_list(bsgrp); | |
7b3e6ba1 | 1230 | } |
1231 | } | |
1232 | return true; | |
1233 | } | |
1234 | ||
5acde1cf | 1235 | int pim_bsm_process(struct interface *ifp, struct ip *ip_hdr, uint8_t *buf, |
1236 | uint32_t buf_size, bool no_fwd) | |
1237 | { | |
1238 | struct bsm_hdr *bshdr; | |
79d97386 | 1239 | int sz = PIM_GBL_SZ_ID; |
5acde1cf | 1240 | struct bsmmsg_grpinfo *msg_grp; |
1241 | struct pim_interface *pim_ifp = NULL; | |
79d97386 | 1242 | struct bsm_info *bsminfo; |
5acde1cf | 1243 | struct pim_instance *pim; |
1244 | char bsr_str[INET_ADDRSTRLEN]; | |
1245 | uint16_t frag_tag; | |
2951a7a4 | 1246 | bool empty_bsm = false; |
5acde1cf | 1247 | |
1248 | /* BSM Packet acceptance validation */ | |
1249 | pim_ifp = ifp->info; | |
1250 | if (!pim_ifp) { | |
1251 | if (PIM_DEBUG_BSM) | |
1252 | zlog_debug("%s: multicast not enabled on interface %s", | |
1253 | __PRETTY_FUNCTION__, ifp->name); | |
1254 | return -1; | |
1255 | } | |
1256 | ||
1257 | pim_ifp->pim_ifstat_bsm_rx++; | |
1258 | pim = pim_ifp->pim; | |
1259 | pim->bsm_rcvd++; | |
1260 | ||
1261 | /* Drop if bsm processing is disabled on interface */ | |
1262 | if (!pim_ifp->bsm_enable) { | |
1263 | zlog_warn("%s: BSM not enabled on interface %s", | |
1264 | __PRETTY_FUNCTION__, ifp->name); | |
1265 | pim_ifp->pim_ifstat_bsm_cfg_miss++; | |
1266 | pim->bsm_dropped++; | |
1267 | return -1; | |
1268 | } | |
1269 | ||
b1945363 DS |
1270 | if (buf_size < sizeof(struct bsm_hdr)) { |
1271 | if (PIM_DEBUG_BSM) | |
1272 | zlog_debug("%s: received buffer length of %d which is too small to properly decode", | |
1273 | __PRETTY_FUNCTION__, buf_size); | |
1274 | return -1; | |
1275 | } | |
1276 | ||
5acde1cf | 1277 | bshdr = (struct bsm_hdr *)(buf + PIM_MSG_HEADER_LEN); |
1278 | pim_inet4_dump("<bsr?>", bshdr->bsr_addr.addr, bsr_str, | |
1279 | sizeof(bsr_str)); | |
1280 | pim->global_scope.hashMasklen = bshdr->hm_len; | |
1281 | frag_tag = ntohs(bshdr->frag_tag); | |
1282 | ||
1283 | /* Identify empty BSM */ | |
1284 | if ((buf_size - PIM_BSM_HDR_LEN - PIM_MSG_HEADER_LEN) < PIM_BSM_GRP_LEN) | |
1285 | empty_bsm = true; | |
1286 | ||
1287 | if (!empty_bsm) { | |
1288 | msg_grp = (struct bsmmsg_grpinfo *)(buf + PIM_MSG_HEADER_LEN | |
1289 | + PIM_BSM_HDR_LEN); | |
1290 | /* Currently we don't support scope zoned BSM */ | |
1291 | if (msg_grp->group.sz) { | |
1292 | if (PIM_DEBUG_BSM) | |
1293 | zlog_debug( | |
1294 | "%s : Administratively scoped range BSM received", | |
1295 | __PRETTY_FUNCTION__); | |
1296 | pim_ifp->pim_ifstat_bsm_invalid_sz++; | |
1297 | pim->bsm_dropped++; | |
1298 | return -1; | |
1299 | } | |
1300 | } | |
1301 | ||
1302 | /* Drop if bsr is not preferred bsr */ | |
1303 | if (!is_preferred_bsr(pim, bshdr->bsr_addr.addr, bshdr->bsr_prio)) { | |
1304 | if (PIM_DEBUG_BSM) | |
1305 | zlog_debug("%s : Received a non-preferred BSM", | |
1306 | __PRETTY_FUNCTION__); | |
1307 | pim->bsm_dropped++; | |
1308 | return -1; | |
1309 | } | |
1310 | ||
1311 | if (no_fwd) { | |
1312 | /* only accept no-forward BSM if quick refresh on startup */ | |
1313 | if ((pim->global_scope.accept_nofwd_bsm) | |
1314 | || (frag_tag == pim->global_scope.bsm_frag_tag)) { | |
1315 | pim->global_scope.accept_nofwd_bsm = false; | |
1316 | } else { | |
1317 | if (PIM_DEBUG_BSM) | |
1318 | zlog_debug( | |
1319 | "%s : nofwd_bsm received on %s when accpt_nofwd_bsm false", | |
1320 | __PRETTY_FUNCTION__, bsr_str); | |
1321 | pim->bsm_dropped++; | |
1322 | pim_ifp->pim_ifstat_ucast_bsm_cfg_miss++; | |
1323 | return -1; | |
1324 | } | |
1325 | } | |
1326 | ||
1327 | /* Mulicast BSM received */ | |
1328 | if (ip_hdr->ip_dst.s_addr == qpim_all_pim_routers_addr.s_addr) { | |
1329 | if (!no_fwd) { | |
1330 | if (!pim_bsr_rpf_check(pim, bshdr->bsr_addr.addr, | |
1331 | ip_hdr->ip_src)) { | |
1332 | if (PIM_DEBUG_BSM) | |
1333 | zlog_debug( | |
1334 | "%s : RPF check fail for BSR address %s", | |
1335 | __PRETTY_FUNCTION__, bsr_str); | |
1336 | pim->bsm_dropped++; | |
1337 | return -1; | |
1338 | } | |
1339 | } | |
1340 | } else if (if_lookup_exact_address(&ip_hdr->ip_dst, AF_INET, | |
1341 | pim->vrf_id)) { | |
1342 | /* Unicast BSM received - if ucast bsm not enabled on | |
1343 | * the interface, drop it | |
1344 | */ | |
1345 | if (!pim_ifp->ucast_bsm_accept) { | |
1346 | if (PIM_DEBUG_BSM) | |
1347 | zlog_debug( | |
1348 | "%s : Unicast BSM not enabled on interface %s", | |
1349 | __PRETTY_FUNCTION__, ifp->name); | |
1350 | pim_ifp->pim_ifstat_ucast_bsm_cfg_miss++; | |
1351 | pim->bsm_dropped++; | |
1352 | return -1; | |
1353 | } | |
1354 | ||
1355 | } else { | |
1356 | if (PIM_DEBUG_BSM) | |
1357 | zlog_debug("%s : Invalid destination address", | |
1358 | __PRETTY_FUNCTION__); | |
1359 | pim->bsm_dropped++; | |
1360 | return -1; | |
1361 | } | |
1362 | ||
1363 | if (empty_bsm) { | |
1364 | if (PIM_DEBUG_BSM) | |
1365 | zlog_debug("%s : Empty Pref BSM received", | |
1366 | __PRETTY_FUNCTION__); | |
1367 | } | |
7b3e6ba1 | 1368 | /* Parse Update bsm rp table and install/uninstall rp if required */ |
1369 | if (!pim_bsm_parse_install_g2rp( | |
1370 | &pim_ifp->pim->global_scope, | |
1371 | (buf + PIM_BSM_HDR_LEN + PIM_MSG_HEADER_LEN), | |
1372 | (buf_size - PIM_BSM_HDR_LEN - PIM_MSG_HEADER_LEN), | |
1373 | frag_tag)) { | |
1374 | if (PIM_DEBUG_BSM) { | |
1375 | zlog_debug("%s, Parsing BSM failed.\r\n", | |
1376 | __PRETTY_FUNCTION__); | |
1377 | } | |
1378 | pim->bsm_dropped++; | |
1379 | return -1; | |
1380 | } | |
5acde1cf | 1381 | /* Restart the bootstrap timer */ |
1382 | pim_bs_timer_restart(&pim_ifp->pim->global_scope, | |
1383 | PIM_BSR_DEFAULT_TIMEOUT); | |
1384 | ||
1385 | /* If new BSM received, clear the old bsm database */ | |
1386 | if (pim_ifp->pim->global_scope.bsm_frag_tag != frag_tag) { | |
1387 | if (PIM_DEBUG_BSM) { | |
1388 | zlog_debug("%s: Current frag tag: %d Frag teg rcvd: %d", | |
1389 | __PRETTY_FUNCTION__, | |
1390 | pim_ifp->pim->global_scope.bsm_frag_tag, | |
1391 | frag_tag); | |
1392 | } | |
1393 | list_delete_all_node(pim_ifp->pim->global_scope.bsm_list); | |
1394 | pim_ifp->pim->global_scope.bsm_frag_tag = frag_tag; | |
1395 | } | |
1396 | ||
1397 | /* update the scope information from bsm */ | |
1398 | pim_bsm_update(pim, bshdr->bsr_addr.addr, bshdr->bsr_prio); | |
79d97386 | 1399 | |
1400 | if (!no_fwd) { | |
1401 | pim_bsm_fwd_whole_sz(pim_ifp->pim, buf, buf_size, sz); | |
1402 | bsminfo = XCALLOC(MTYPE_PIM_BSM_INFO, sizeof(struct bsm_info)); | |
79d97386 | 1403 | |
1404 | bsminfo->bsm = XCALLOC(MTYPE_PIM_BSM_PKT_VAR_MEM, buf_size); | |
79d97386 | 1405 | |
1406 | bsminfo->size = buf_size; | |
1407 | memcpy(bsminfo->bsm, buf, buf_size); | |
1408 | listnode_add(pim_ifp->pim->global_scope.bsm_list, bsminfo); | |
1409 | } | |
1410 | ||
5acde1cf | 1411 | return 0; |
1412 | } |