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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 | { | |
e1b36e13 | 89 | XFREE(MTYPE_PIM_BSM_PKT_VAR_MEM, bsm->bsm); |
361b5843 | 90 | XFREE(MTYPE_PIM_BSM_INFO, bsm); |
91 | } | |
92 | ||
7b3e6ba1 | 93 | static int pim_g2rp_list_compare(struct bsm_rpinfo *node1, |
94 | struct bsm_rpinfo *node2) | |
95 | { | |
96 | /* RP election Algo : | |
97 | * Step-1 : Loweset Rp priority will have higher precedance. | |
98 | * Step-2 : If priority same then higher hash val will have | |
99 | * higher precedance. | |
100 | * Step-3 : If Hash val is same then highest rp address will | |
101 | * become elected RP. | |
102 | */ | |
103 | if (node1->rp_prio < node2->rp_prio) | |
104 | return -1; | |
105 | if (node1->rp_prio > node2->rp_prio) | |
106 | return 1; | |
107 | if (node1->hash < node2->hash) | |
108 | return 1; | |
109 | if (node1->hash > node2->hash) | |
110 | return -1; | |
111 | if (node1->rp_address.s_addr < node2->rp_address.s_addr) | |
112 | return 1; | |
113 | if (node1->rp_address.s_addr > node2->rp_address.s_addr) | |
114 | return -1; | |
115 | return 0; | |
116 | } | |
117 | ||
118 | static void pim_free_bsrp_node(struct bsm_rpinfo *bsrp_info) | |
119 | { | |
120 | if (bsrp_info->g2rp_timer) | |
121 | THREAD_OFF(bsrp_info->g2rp_timer); | |
122 | XFREE(MTYPE_PIM_BSRP_NODE, bsrp_info); | |
123 | } | |
124 | ||
125 | static struct list *pim_alloc_bsrp_list(void) | |
126 | { | |
127 | struct list *new_list = NULL; | |
128 | ||
129 | new_list = list_new(); | |
130 | ||
131 | if (!new_list) | |
132 | return NULL; | |
133 | ||
134 | new_list->cmp = (int (*)(void *, void *))pim_g2rp_list_compare; | |
135 | new_list->del = (void (*)(void *))pim_free_bsrp_node; | |
136 | ||
137 | return new_list; | |
138 | } | |
139 | ||
140 | static struct bsgrp_node *pim_bsm_new_bsgrp_node(struct route_table *rt, | |
141 | struct prefix *grp) | |
142 | { | |
143 | struct route_node *rn; | |
144 | struct bsgrp_node *bsgrp; | |
145 | ||
146 | rn = route_node_get(rt, grp); | |
147 | if (!rn) { | |
15569c58 | 148 | zlog_warn("%s: route node creation failed", __func__); |
7b3e6ba1 | 149 | return NULL; |
150 | } | |
151 | bsgrp = XCALLOC(MTYPE_PIM_BSGRP_NODE, sizeof(struct bsgrp_node)); | |
152 | ||
7b3e6ba1 | 153 | rn->info = bsgrp; |
154 | bsgrp->bsrp_list = pim_alloc_bsrp_list(); | |
155 | bsgrp->partial_bsrp_list = pim_alloc_bsrp_list(); | |
156 | ||
157 | if ((!bsgrp->bsrp_list) || (!bsgrp->partial_bsrp_list)) { | |
158 | route_unlock_node(rn); | |
159 | pim_free_bsgrp_data(bsgrp); | |
160 | return NULL; | |
161 | } | |
162 | ||
163 | prefix_copy(&bsgrp->group, grp); | |
164 | return bsgrp; | |
165 | } | |
166 | ||
23255dfd | 167 | static int pim_on_bs_timer(struct thread *t) |
168 | { | |
c843f56d | 169 | struct route_node *rn; |
170 | struct bsm_scope *scope; | |
171 | struct bsgrp_node *bsgrp_node; | |
172 | struct bsm_rpinfo *bsrp; | |
173 | struct prefix nht_p; | |
174 | char buf[PREFIX2STR_BUFFER]; | |
175 | bool is_bsr_tracking = true; | |
176 | ||
177 | scope = THREAD_ARG(t); | |
178 | THREAD_OFF(scope->bs_timer); | |
179 | ||
180 | if (PIM_DEBUG_BSM) | |
181 | zlog_debug("%s: Bootstrap Timer expired for scope: %d", | |
15569c58 | 182 | __func__, scope->sz_id); |
c843f56d | 183 | |
184 | /* Remove next hop tracking for the bsr */ | |
185 | nht_p.family = AF_INET; | |
186 | nht_p.prefixlen = IPV4_MAX_BITLEN; | |
187 | nht_p.u.prefix4 = scope->current_bsr; | |
188 | if (PIM_DEBUG_BSM) { | |
189 | prefix2str(&nht_p, buf, sizeof(buf)); | |
190 | zlog_debug("%s: Deregister BSR addr %s with Zebra NHT", | |
15569c58 | 191 | __func__, buf); |
c843f56d | 192 | } |
193 | pim_delete_tracked_nexthop(scope->pim, &nht_p, NULL, NULL, | |
194 | is_bsr_tracking); | |
195 | ||
196 | /* Reset scope zone data */ | |
197 | scope->accept_nofwd_bsm = false; | |
198 | scope->state = ACCEPT_ANY; | |
199 | scope->current_bsr.s_addr = INADDR_ANY; | |
200 | scope->current_bsr_prio = 0; | |
201 | scope->current_bsr_first_ts = 0; | |
202 | scope->current_bsr_last_ts = 0; | |
203 | scope->bsm_frag_tag = 0; | |
204 | list_delete_all_node(scope->bsm_list); | |
205 | ||
206 | for (rn = route_top(scope->bsrp_table); rn; rn = route_next(rn)) { | |
207 | ||
208 | bsgrp_node = (struct bsgrp_node *)rn->info; | |
209 | if (!bsgrp_node) { | |
210 | if (PIM_DEBUG_BSM) | |
15569c58 | 211 | zlog_debug("%s: bsgrp_node is null", __func__); |
c843f56d | 212 | continue; |
213 | } | |
214 | /* Give grace time for rp to continue for another hold time */ | |
215 | if ((bsgrp_node->bsrp_list) && (bsgrp_node->bsrp_list->count)) { | |
216 | bsrp = listnode_head(bsgrp_node->bsrp_list); | |
217 | pim_g2rp_timer_restart(bsrp, bsrp->rp_holdtime); | |
218 | } | |
219 | /* clear pending list */ | |
220 | if ((bsgrp_node->partial_bsrp_list) | |
221 | && (bsgrp_node->partial_bsrp_list->count)) { | |
222 | list_delete_all_node(bsgrp_node->partial_bsrp_list); | |
223 | bsgrp_node->pend_rp_cnt = 0; | |
224 | } | |
225 | } | |
23255dfd | 226 | return 0; |
227 | } | |
228 | ||
229 | static void pim_bs_timer_stop(struct bsm_scope *scope) | |
230 | { | |
231 | if (PIM_DEBUG_BSM) | |
15569c58 DA |
232 | zlog_debug("%s : BS timer being stopped of sz: %d", __func__, |
233 | scope->sz_id); | |
23255dfd | 234 | THREAD_OFF(scope->bs_timer); |
235 | } | |
236 | ||
237 | static void pim_bs_timer_start(struct bsm_scope *scope, int bs_timeout) | |
238 | { | |
239 | if (!scope) { | |
240 | if (PIM_DEBUG_BSM) | |
15569c58 | 241 | zlog_debug("%s : Invalid scope(NULL).", __func__); |
23255dfd | 242 | return; |
243 | } | |
244 | THREAD_OFF(scope->bs_timer); | |
245 | if (PIM_DEBUG_BSM) | |
15569c58 DA |
246 | zlog_debug( |
247 | "%s : starting bs timer for scope %d with timeout %d secs", | |
248 | __func__, scope->sz_id, bs_timeout); | |
23255dfd | 249 | thread_add_timer(router->master, pim_on_bs_timer, scope, bs_timeout, |
250 | &scope->bs_timer); | |
251 | } | |
252 | ||
5acde1cf | 253 | static inline void pim_bs_timer_restart(struct bsm_scope *scope, int bs_timeout) |
254 | { | |
255 | pim_bs_timer_start(scope, bs_timeout); | |
256 | } | |
257 | ||
361b5843 | 258 | void pim_bsm_proc_init(struct pim_instance *pim) |
259 | { | |
260 | memset(&pim->global_scope, 0, sizeof(struct bsm_scope)); | |
261 | ||
262 | pim->global_scope.sz_id = PIM_GBL_SZ_ID; | |
263 | pim->global_scope.bsrp_table = route_table_init(); | |
264 | pim->global_scope.accept_nofwd_bsm = true; | |
265 | pim->global_scope.state = NO_INFO; | |
266 | pim->global_scope.pim = pim; | |
267 | pim->global_scope.bsm_list = list_new(); | |
268 | pim->global_scope.bsm_list->del = (void (*)(void *))pim_bsm_node_free; | |
269 | pim_bs_timer_start(&pim->global_scope, PIM_BS_TIME); | |
270 | } | |
271 | ||
272 | void pim_bsm_proc_free(struct pim_instance *pim) | |
273 | { | |
274 | struct route_node *rn; | |
275 | struct bsgrp_node *bsgrp; | |
276 | ||
277 | pim_bs_timer_stop(&pim->global_scope); | |
278 | ||
279 | if (pim->global_scope.bsm_list) | |
280 | list_delete(&pim->global_scope.bsm_list); | |
281 | ||
d0e418b4 | 282 | for (rn = route_top(pim->global_scope.bsrp_table); rn; |
283 | rn = route_next(rn)) { | |
361b5843 | 284 | bsgrp = rn->info; |
285 | if (!bsgrp) | |
286 | continue; | |
287 | pim_free_bsgrp_data(bsgrp); | |
288 | } | |
289 | ||
4d19a911 | 290 | route_table_finish(pim->global_scope.bsrp_table); |
361b5843 | 291 | } |
292 | ||
c295e391 | 293 | static bool is_hold_time_elapsed(void *data) |
294 | { | |
295 | struct bsm_rpinfo *bsrp; | |
296 | ||
297 | bsrp = data; | |
298 | ||
299 | if (bsrp->elapse_time < bsrp->rp_holdtime) | |
300 | return false; | |
301 | else | |
302 | return true; | |
303 | } | |
304 | ||
a5164e97 | 305 | static int pim_on_g2rp_timer(struct thread *t) |
306 | { | |
c295e391 | 307 | struct bsm_rpinfo *bsrp; |
308 | struct bsm_rpinfo *bsrp_node; | |
309 | struct bsgrp_node *bsgrp_node; | |
310 | struct listnode *bsrp_ln; | |
311 | struct pim_instance *pim; | |
312 | struct rp_info *rp_info; | |
313 | struct route_node *rn; | |
314 | uint16_t elapse; | |
315 | struct in_addr bsrp_addr; | |
316 | ||
317 | bsrp = THREAD_ARG(t); | |
318 | THREAD_OFF(bsrp->g2rp_timer); | |
319 | bsgrp_node = bsrp->bsgrp_node; | |
320 | ||
321 | /* elapse time is the hold time of expired node */ | |
322 | elapse = bsrp->rp_holdtime; | |
323 | bsrp_addr = bsrp->rp_address; | |
324 | ||
325 | /* update elapse for all bsrp nodes */ | |
326 | for (ALL_LIST_ELEMENTS_RO(bsgrp_node->bsrp_list, bsrp_ln, bsrp_node)) | |
327 | bsrp_node->elapse_time += elapse; | |
328 | ||
329 | /* remove the expired nodes from the list */ | |
330 | list_filter_out_nodes(bsgrp_node->bsrp_list, is_hold_time_elapsed); | |
331 | ||
332 | /* Get the next elected rp node */ | |
333 | bsrp = listnode_head(bsgrp_node->bsrp_list); | |
334 | pim = bsgrp_node->scope->pim; | |
335 | rn = route_node_lookup(pim->rp_table, &bsgrp_node->group); | |
336 | ||
337 | if (!rn) { | |
5e81f5dd | 338 | zlog_warn("%s: Route node doesn't exist", __func__); |
c295e391 | 339 | return 0; |
340 | } | |
341 | ||
342 | rp_info = (struct rp_info *)rn->info; | |
343 | ||
344 | if (!rp_info) { | |
345 | route_unlock_node(rn); | |
346 | return 0; | |
347 | } | |
348 | ||
349 | if (rp_info->rp_src != RP_SRC_STATIC) { | |
350 | /* If new rp available, change it else delete the existing */ | |
351 | if (bsrp) { | |
352 | bsrp_addr = bsrp->rp_address; | |
353 | pim_g2rp_timer_start( | |
354 | bsrp, (bsrp->rp_holdtime - bsrp->elapse_time)); | |
355 | pim_rp_change(pim, bsrp_addr, bsgrp_node->group, | |
356 | RP_SRC_BSR); | |
357 | } else { | |
358 | pim_rp_del(pim, bsrp_addr, bsgrp_node->group, NULL, | |
359 | RP_SRC_BSR); | |
360 | } | |
361 | } | |
362 | ||
363 | if ((!bsgrp_node->bsrp_list->count) | |
364 | && (!bsgrp_node->partial_bsrp_list->count)) { | |
365 | pim_free_bsgrp_node(pim->global_scope.bsrp_table, | |
366 | &bsgrp_node->group); | |
367 | pim_free_bsgrp_data(bsgrp_node); | |
368 | } | |
369 | ||
a5164e97 | 370 | return 0; |
371 | } | |
372 | ||
373 | static void pim_g2rp_timer_start(struct bsm_rpinfo *bsrp, int hold_time) | |
374 | { | |
375 | if (!bsrp) { | |
376 | if (PIM_DEBUG_BSM) | |
15569c58 | 377 | zlog_debug("%s : Invalid brsp(NULL).", __func__); |
a5164e97 | 378 | return; |
379 | } | |
380 | THREAD_OFF(bsrp->g2rp_timer); | |
381 | if (PIM_DEBUG_BSM) { | |
382 | char buf[48]; | |
383 | ||
384 | zlog_debug( | |
385 | "%s : starting g2rp timer for grp: %s - rp: %s with timeout %d secs(Actual Hold time : %d secs)", | |
15569c58 | 386 | __func__, prefix2str(&bsrp->bsgrp_node->group, buf, 48), |
a5164e97 | 387 | inet_ntoa(bsrp->rp_address), hold_time, |
388 | bsrp->rp_holdtime); | |
389 | } | |
390 | ||
391 | thread_add_timer(router->master, pim_on_g2rp_timer, bsrp, hold_time, | |
392 | &bsrp->g2rp_timer); | |
393 | } | |
394 | ||
395 | static inline void pim_g2rp_timer_restart(struct bsm_rpinfo *bsrp, | |
396 | int hold_time) | |
397 | { | |
398 | pim_g2rp_timer_start(bsrp, hold_time); | |
399 | } | |
400 | ||
20fd30e5 | 401 | static void pim_g2rp_timer_stop(struct bsm_rpinfo *bsrp) |
402 | { | |
403 | if (!bsrp) | |
404 | return; | |
405 | ||
406 | if (PIM_DEBUG_BSM) { | |
407 | char buf[48]; | |
408 | ||
409 | zlog_debug("%s : stopping g2rp timer for grp: %s - rp: %s", | |
15569c58 | 410 | __func__, |
20fd30e5 | 411 | prefix2str(&bsrp->bsgrp_node->group, buf, 48), |
412 | inet_ntoa(bsrp->rp_address)); | |
413 | } | |
414 | ||
415 | THREAD_OFF(bsrp->g2rp_timer); | |
416 | } | |
417 | ||
418 | static bool is_hold_time_zero(void *data) | |
419 | { | |
420 | struct bsm_rpinfo *bsrp; | |
421 | ||
422 | bsrp = data; | |
423 | ||
424 | if (bsrp->rp_holdtime) | |
425 | return false; | |
426 | else | |
427 | return true; | |
428 | } | |
429 | ||
430 | static void pim_instate_pend_list(struct bsgrp_node *bsgrp_node) | |
431 | { | |
432 | struct bsm_rpinfo *active; | |
433 | struct bsm_rpinfo *pend; | |
434 | struct list *temp; | |
435 | struct rp_info *rp_info; | |
436 | struct route_node *rn; | |
437 | struct pim_instance *pim; | |
438 | struct rp_info *rp_all; | |
439 | struct prefix group_all; | |
440 | bool had_rp_node = true; | |
441 | ||
442 | pim = bsgrp_node->scope->pim; | |
443 | active = listnode_head(bsgrp_node->bsrp_list); | |
444 | ||
445 | /* Remove nodes with hold time 0 & check if list still has a head */ | |
446 | list_filter_out_nodes(bsgrp_node->partial_bsrp_list, is_hold_time_zero); | |
447 | pend = listnode_head(bsgrp_node->partial_bsrp_list); | |
448 | ||
449 | if (!str2prefix("224.0.0.0/4", &group_all)) | |
450 | return; | |
451 | ||
452 | rp_all = pim_rp_find_match_group(pim, &group_all); | |
453 | rn = route_node_lookup(pim->rp_table, &bsgrp_node->group); | |
454 | ||
455 | if (pend) | |
456 | pim_g2rp_timer_start(pend, pend->rp_holdtime); | |
457 | ||
458 | /* if rp node doesn't exist or exist but not configured(rp_all), | |
459 | * install the rp from head(if exists) of partial list. List is | |
460 | * is sorted such that head is the elected RP for the group. | |
461 | */ | |
462 | if (!rn || (prefix_same(&rp_all->group, &bsgrp_node->group) | |
463 | && pim_rpf_addr_is_inaddr_none(&rp_all->rp))) { | |
464 | if (PIM_DEBUG_BSM) | |
15569c58 | 465 | zlog_debug("%s: Route node doesn't exist", __func__); |
20fd30e5 | 466 | if (pend) |
467 | pim_rp_new(pim, pend->rp_address, bsgrp_node->group, | |
468 | NULL, RP_SRC_BSR); | |
469 | had_rp_node = false; | |
470 | } else { | |
471 | rp_info = (struct rp_info *)rn->info; | |
472 | if (!rp_info) { | |
473 | route_unlock_node(rn); | |
474 | if (pend) | |
475 | pim_rp_new(pim, pend->rp_address, | |
476 | bsgrp_node->group, NULL, RP_SRC_BSR); | |
477 | had_rp_node = false; | |
478 | } | |
479 | } | |
480 | ||
481 | /* We didn't have rp node and pending list is empty(unlikely), cleanup*/ | |
482 | if ((!had_rp_node) && (!pend)) { | |
483 | pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table, | |
484 | &bsgrp_node->group); | |
485 | pim_free_bsgrp_data(bsgrp_node); | |
486 | return; | |
487 | } | |
488 | ||
489 | if ((had_rp_node) && (rp_info->rp_src != RP_SRC_STATIC)) { | |
490 | /* This means we searched and got rp node, needs unlock */ | |
491 | route_unlock_node(rn); | |
492 | ||
493 | if (active && pend) { | |
494 | if ((active->rp_address.s_addr | |
495 | != pend->rp_address.s_addr)) | |
496 | pim_rp_change(pim, pend->rp_address, | |
497 | bsgrp_node->group, RP_SRC_BSR); | |
498 | } | |
499 | ||
500 | /* Possible when the first BSM has group with 0 rp count */ | |
501 | if ((!active) && (!pend)) { | |
502 | if (PIM_DEBUG_BSM) { | |
503 | zlog_debug( | |
504 | "%s: Both bsrp and partial list are empty", | |
15569c58 | 505 | __func__); |
20fd30e5 | 506 | } |
507 | pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table, | |
508 | &bsgrp_node->group); | |
509 | pim_free_bsgrp_data(bsgrp_node); | |
510 | return; | |
511 | } | |
512 | ||
513 | /* Possible when a group with 0 rp count received in BSM */ | |
514 | if ((active) && (!pend)) { | |
515 | pim_rp_del(pim, active->rp_address, bsgrp_node->group, | |
516 | NULL, RP_SRC_BSR); | |
517 | pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table, | |
518 | &bsgrp_node->group); | |
519 | if (PIM_DEBUG_BSM) { | |
520 | zlog_debug("%s:Pend List is null,del grp node", | |
15569c58 | 521 | __func__); |
20fd30e5 | 522 | } |
523 | pim_free_bsgrp_data(bsgrp_node); | |
524 | return; | |
525 | } | |
526 | } | |
527 | ||
528 | if ((had_rp_node) && (rp_info->rp_src == RP_SRC_STATIC)) { | |
529 | /* We need to unlock rn this case */ | |
530 | route_unlock_node(rn); | |
531 | /* there is a chance that static rp exist and bsrp cleaned | |
532 | * so clean bsgrp node if pending list empty | |
533 | */ | |
534 | if (!pend) { | |
535 | if (PIM_DEBUG_BSM) | |
536 | zlog_debug( | |
537 | "%s: Partial list is empty, static rp exists", | |
15569c58 | 538 | __func__); |
20fd30e5 | 539 | pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table, |
540 | &bsgrp_node->group); | |
541 | pim_free_bsgrp_data(bsgrp_node); | |
542 | return; | |
543 | } | |
544 | } | |
545 | ||
546 | /* swap the list & delete all nodes in partial list (old bsrp_list) | |
547 | * before swap | |
548 | * active is head of bsrp list | |
549 | * pend is head of partial list | |
550 | * After swap | |
551 | * active is head of partial list | |
552 | * pend is head of bsrp list | |
553 | * So check appriate head after swap and clean the new partial list | |
554 | */ | |
555 | temp = bsgrp_node->bsrp_list; | |
556 | bsgrp_node->bsrp_list = bsgrp_node->partial_bsrp_list; | |
557 | bsgrp_node->partial_bsrp_list = temp; | |
558 | ||
559 | if (active) { | |
560 | pim_g2rp_timer_stop(active); | |
561 | list_delete_all_node(bsgrp_node->partial_bsrp_list); | |
562 | } | |
563 | } | |
564 | ||
5acde1cf | 565 | static bool pim_bsr_rpf_check(struct pim_instance *pim, struct in_addr bsr, |
566 | struct in_addr ip_src_addr) | |
567 | { | |
568 | struct pim_nexthop nexthop; | |
569 | int result; | |
570 | ||
571 | memset(&nexthop, 0, sizeof(nexthop)); | |
572 | ||
573 | /* New BSR recived */ | |
574 | if (bsr.s_addr != pim->global_scope.current_bsr.s_addr) { | |
575 | result = pim_nexthop_match(pim, bsr, ip_src_addr); | |
576 | ||
577 | /* Nexthop lookup pass for the new BSR address */ | |
578 | if (result) | |
579 | return true; | |
580 | ||
581 | if (PIM_DEBUG_BSM) { | |
582 | char bsr_str[INET_ADDRSTRLEN]; | |
583 | ||
584 | pim_inet4_dump("<bsr?>", bsr, bsr_str, sizeof(bsr_str)); | |
15569c58 DA |
585 | zlog_debug("%s : No route to BSR address %s", __func__, |
586 | bsr_str); | |
5acde1cf | 587 | } |
588 | return false; | |
589 | } | |
590 | ||
591 | return pim_nexthop_match_nht_cache(pim, bsr, ip_src_addr); | |
592 | } | |
593 | ||
594 | static bool is_preferred_bsr(struct pim_instance *pim, struct in_addr bsr, | |
595 | uint32_t bsr_prio) | |
596 | { | |
597 | if (bsr.s_addr == pim->global_scope.current_bsr.s_addr) | |
598 | return true; | |
599 | ||
600 | if (bsr_prio > pim->global_scope.current_bsr_prio) | |
601 | return true; | |
602 | ||
603 | else if (bsr_prio == pim->global_scope.current_bsr_prio) { | |
e34c4619 | 604 | if (ntohl(bsr.s_addr) |
605 | >= ntohl(pim->global_scope.current_bsr.s_addr)) | |
5acde1cf | 606 | return true; |
607 | else | |
608 | return false; | |
609 | } else | |
610 | return false; | |
611 | } | |
612 | ||
613 | static void pim_bsm_update(struct pim_instance *pim, struct in_addr bsr, | |
614 | uint32_t bsr_prio) | |
615 | { | |
616 | struct pim_nexthop_cache pnc; | |
617 | ||
618 | if (bsr.s_addr != pim->global_scope.current_bsr.s_addr) { | |
619 | struct prefix nht_p; | |
620 | char buf[PREFIX2STR_BUFFER]; | |
621 | bool is_bsr_tracking = true; | |
622 | ||
623 | /* De-register old BSR and register new BSR with Zebra NHT */ | |
624 | nht_p.family = AF_INET; | |
625 | nht_p.prefixlen = IPV4_MAX_BITLEN; | |
626 | ||
627 | if (pim->global_scope.current_bsr.s_addr != INADDR_ANY) { | |
628 | nht_p.u.prefix4 = pim->global_scope.current_bsr; | |
629 | if (PIM_DEBUG_BSM) { | |
630 | prefix2str(&nht_p, buf, sizeof(buf)); | |
631 | zlog_debug( | |
632 | "%s: Deregister BSR addr %s with Zebra NHT", | |
15569c58 | 633 | __func__, buf); |
5acde1cf | 634 | } |
635 | pim_delete_tracked_nexthop(pim, &nht_p, NULL, NULL, | |
636 | is_bsr_tracking); | |
637 | } | |
638 | ||
639 | nht_p.u.prefix4 = bsr; | |
640 | if (PIM_DEBUG_BSM) { | |
641 | prefix2str(&nht_p, buf, sizeof(buf)); | |
642 | zlog_debug( | |
643 | "%s: NHT Register BSR addr %s with Zebra NHT", | |
15569c58 | 644 | __func__, buf); |
5acde1cf | 645 | } |
646 | ||
647 | memset(&pnc, 0, sizeof(struct pim_nexthop_cache)); | |
648 | pim_find_or_track_nexthop(pim, &nht_p, NULL, NULL, | |
649 | is_bsr_tracking, &pnc); | |
650 | pim->global_scope.current_bsr = bsr; | |
651 | pim->global_scope.current_bsr_first_ts = | |
652 | pim_time_monotonic_sec(); | |
653 | pim->global_scope.state = ACCEPT_PREFERRED; | |
654 | } | |
655 | pim->global_scope.current_bsr_prio = bsr_prio; | |
656 | pim->global_scope.current_bsr_last_ts = pim_time_monotonic_sec(); | |
657 | } | |
658 | ||
79d97386 | 659 | static bool pim_bsm_send_intf(uint8_t *buf, int len, struct interface *ifp, |
660 | struct in_addr dst_addr) | |
661 | { | |
662 | struct pim_interface *pim_ifp; | |
663 | ||
664 | pim_ifp = ifp->info; | |
665 | ||
666 | if (!pim_ifp) { | |
667 | if (PIM_DEBUG_BSM) | |
668 | zlog_debug("%s: Pim interface not available for %s", | |
15569c58 | 669 | __func__, ifp->name); |
79d97386 | 670 | return false; |
671 | } | |
672 | ||
673 | if (pim_ifp->pim_sock_fd == -1) { | |
674 | if (PIM_DEBUG_BSM) | |
675 | zlog_debug("%s: Pim sock not available for %s", | |
15569c58 | 676 | __func__, ifp->name); |
79d97386 | 677 | return false; |
678 | } | |
679 | ||
3bb29c4e DS |
680 | if (pim_msg_send(pim_ifp->pim_sock_fd, pim_ifp->primary_address, |
681 | dst_addr, buf, len, ifp->name)) { | |
682 | zlog_warn("%s: Could not send BSM message on interface: %s", | |
15569c58 | 683 | __func__, ifp->name); |
3bb29c4e DS |
684 | return false; |
685 | } | |
686 | ||
79d97386 | 687 | pim_ifp->pim_ifstat_bsm_tx++; |
688 | pim_ifp->pim->bsm_sent++; | |
689 | return true; | |
690 | } | |
691 | ||
40270c35 | 692 | static bool pim_bsm_frag_send(uint8_t *buf, uint32_t len, struct interface *ifp, |
693 | uint32_t pim_mtu, struct in_addr dst_addr, | |
694 | bool no_fwd) | |
695 | { | |
696 | struct bsmmsg_grpinfo *grpinfo, *curgrp; | |
697 | uint8_t *firstgrp_ptr; | |
698 | uint8_t *pkt; | |
699 | uint8_t *pak_start; | |
700 | uint32_t parsed_len = 0; | |
701 | uint32_t this_pkt_rem; | |
702 | uint32_t copy_byte_count; | |
703 | uint32_t this_pkt_len; | |
704 | uint8_t total_rp_cnt; | |
705 | uint8_t this_rp_cnt; | |
706 | uint8_t frag_rp_cnt; | |
707 | uint8_t rp_fit_cnt; | |
708 | bool pak_pending = false; | |
709 | ||
710 | /* MTU passed here is PIM MTU (IP MTU less IP Hdr) */ | |
711 | if (pim_mtu < (PIM_MIN_BSM_LEN)) { | |
712 | zlog_warn( | |
f79f7a7b | 713 | "%s: mtu(pim mtu: %d) size less than minimum bootstrap len", |
15569c58 | 714 | __func__, pim_mtu); |
40270c35 | 715 | if (PIM_DEBUG_BSM) |
716 | zlog_debug( | |
f79f7a7b | 717 | "%s: mtu (pim mtu:%d) less than minimum bootstrap len", |
15569c58 | 718 | __func__, pim_mtu); |
40270c35 | 719 | return false; |
720 | } | |
721 | ||
722 | pak_start = XCALLOC(MTYPE_PIM_BSM_PKT_VAR_MEM, pim_mtu); | |
723 | ||
40270c35 | 724 | pkt = pak_start; |
725 | ||
726 | /* Fill PIM header later before sending packet to calc checksum */ | |
727 | pkt += PIM_MSG_HEADER_LEN; | |
728 | buf += PIM_MSG_HEADER_LEN; | |
729 | ||
730 | /* copy bsm header to new packet at offset of pim hdr */ | |
731 | memcpy(pkt, buf, PIM_BSM_HDR_LEN); | |
732 | pkt += PIM_BSM_HDR_LEN; | |
733 | buf += PIM_BSM_HDR_LEN; | |
734 | parsed_len += (PIM_MSG_HEADER_LEN + PIM_BSM_HDR_LEN); | |
735 | ||
736 | /* Store the position of first grp ptr, which can be reused for | |
737 | * next packet to start filling group. old bsm header and pim hdr | |
738 | * remains. So need not be filled again for next packet onwards. | |
739 | */ | |
740 | firstgrp_ptr = pkt; | |
741 | ||
742 | /* we received mtu excluding IP hdr len as param | |
743 | * now this_pkt_rem is mtu excluding | |
744 | * PIM_BSM_HDR_LEN + PIM_MSG_HEADER_LEN | |
745 | */ | |
746 | this_pkt_rem = pim_mtu - (PIM_BSM_HDR_LEN + PIM_MSG_HEADER_LEN); | |
747 | ||
748 | /* For each group till the packet length parsed */ | |
749 | while (parsed_len < len) { | |
750 | /* pkt ---> fragment's current pointer | |
751 | * buf ---> input buffer's current pointer | |
752 | * mtu ---> size of the pim packet - PIM header | |
753 | * curgrp ---> current group on the fragment | |
754 | * grpinfo ---> current group on the input buffer | |
755 | * this_pkt_rem ---> bytes remaing on the current fragment | |
756 | * rp_fit_cnt ---> num of rp for current grp that | |
757 | * fits this frag | |
758 | * total_rp_cnt ---> total rp present for the group in the buf | |
759 | * frag_rp_cnt ---> no of rp for the group to be fit in | |
760 | * the frag | |
761 | * this_rp_cnt ---> how many rp have we parsed | |
762 | */ | |
763 | grpinfo = (struct bsmmsg_grpinfo *)buf; | |
764 | memcpy(pkt, buf, PIM_BSM_GRP_LEN); | |
765 | curgrp = (struct bsmmsg_grpinfo *)pkt; | |
766 | parsed_len += PIM_BSM_GRP_LEN; | |
767 | pkt += PIM_BSM_GRP_LEN; | |
768 | buf += PIM_BSM_GRP_LEN; | |
769 | this_pkt_rem -= PIM_BSM_GRP_LEN; | |
770 | ||
771 | /* initialize rp count and total_rp_cnt before the rp loop */ | |
772 | this_rp_cnt = 0; | |
773 | total_rp_cnt = grpinfo->frag_rp_count; | |
774 | ||
775 | /* Loop till all RPs for the group parsed */ | |
776 | while (this_rp_cnt < total_rp_cnt) { | |
777 | /* All RP from a group processed here. | |
778 | * group is pointed by grpinfo. | |
779 | * At this point make sure buf pointing to a RP | |
780 | * within a group | |
781 | */ | |
782 | rp_fit_cnt = this_pkt_rem / PIM_BSM_RP_LEN; | |
783 | ||
784 | /* calculate how many rp am i going to copy in | |
785 | * this frag | |
786 | */ | |
787 | if (rp_fit_cnt > (total_rp_cnt - this_rp_cnt)) | |
788 | frag_rp_cnt = total_rp_cnt - this_rp_cnt; | |
789 | else | |
790 | frag_rp_cnt = rp_fit_cnt; | |
791 | ||
792 | /* populate the frag rp count for the current grp */ | |
793 | curgrp->frag_rp_count = frag_rp_cnt; | |
794 | copy_byte_count = frag_rp_cnt * PIM_BSM_RP_LEN; | |
795 | ||
796 | /* copy all the rp that we are fitting in this | |
797 | * frag for the grp | |
798 | */ | |
799 | memcpy(pkt, buf, copy_byte_count); | |
800 | this_rp_cnt += frag_rp_cnt; | |
801 | buf += copy_byte_count; | |
802 | pkt += copy_byte_count; | |
803 | parsed_len += copy_byte_count; | |
804 | this_pkt_rem -= copy_byte_count; | |
805 | ||
806 | /* Either we couldn't fit all rp for the group or the | |
807 | * mtu reached | |
808 | */ | |
809 | if ((this_rp_cnt < total_rp_cnt) | |
810 | || (this_pkt_rem | |
811 | < (PIM_BSM_GRP_LEN + PIM_BSM_RP_LEN))) { | |
812 | /* No space to fit in more rp, send this pkt */ | |
813 | this_pkt_len = pim_mtu - this_pkt_rem; | |
814 | pim_msg_build_header(pak_start, this_pkt_len, | |
815 | PIM_MSG_TYPE_BOOTSTRAP, | |
816 | no_fwd); | |
817 | pim_bsm_send_intf(pak_start, this_pkt_len, ifp, | |
818 | dst_addr); | |
819 | ||
820 | /* Construct next fragment. Reuse old packet */ | |
821 | pkt = firstgrp_ptr; | |
822 | this_pkt_rem = pim_mtu - (PIM_BSM_HDR_LEN | |
823 | + PIM_MSG_HEADER_LEN); | |
824 | ||
825 | /* If pkt can't accomodate next group + atleast | |
826 | * one rp, we must break out of this inner loop | |
827 | * and process next RP | |
828 | */ | |
829 | if (total_rp_cnt == this_rp_cnt) | |
830 | break; | |
831 | ||
832 | /* If some more RPs for the same group pending, | |
833 | * fill grp hdr | |
834 | */ | |
835 | memcpy(pkt, (uint8_t *)grpinfo, | |
836 | PIM_BSM_GRP_LEN); | |
837 | curgrp = (struct bsmmsg_grpinfo *)pkt; | |
838 | pkt += PIM_BSM_GRP_LEN; | |
839 | this_pkt_rem -= PIM_BSM_GRP_LEN; | |
840 | pak_pending = false; | |
841 | } else { | |
842 | /* We filled something but not yet sent out */ | |
843 | pak_pending = true; | |
844 | } | |
845 | } /* while RP count */ | |
846 | } /*while parsed len */ | |
847 | ||
848 | /* Send if we have any unsent packet */ | |
849 | if (pak_pending) { | |
850 | this_pkt_len = pim_mtu - this_pkt_rem; | |
851 | pim_msg_build_header(pak_start, this_pkt_len, | |
852 | PIM_MSG_TYPE_BOOTSTRAP, no_fwd); | |
853 | pim_bsm_send_intf(pak_start, (pim_mtu - this_pkt_rem), ifp, | |
854 | dst_addr); | |
855 | } | |
856 | XFREE(MTYPE_PIM_BSM_PKT_VAR_MEM, pak_start); | |
857 | return true; | |
858 | } | |
859 | ||
79d97386 | 860 | static void pim_bsm_fwd_whole_sz(struct pim_instance *pim, uint8_t *buf, |
861 | uint32_t len, int sz) | |
862 | { | |
863 | struct interface *ifp; | |
864 | struct pim_interface *pim_ifp; | |
865 | struct in_addr dst_addr; | |
866 | uint32_t pim_mtu; | |
2951a7a4 QY |
867 | bool no_fwd = false; |
868 | bool ret = false; | |
79d97386 | 869 | |
870 | /* For now only global scope zone is supported, so send on all | |
871 | * pim interfaces in the vrf | |
872 | */ | |
873 | dst_addr = qpim_all_pim_routers_addr; | |
874 | FOR_ALL_INTERFACES (pim->vrf, ifp) { | |
875 | pim_ifp = ifp->info; | |
876 | if ((!pim_ifp) || (!pim_ifp->bsm_enable)) | |
877 | continue; | |
9255f21e | 878 | |
879 | /* | |
880 | * RFC 5059 Sec 3.4: | |
881 | * When a Bootstrap message is forwarded, it is forwarded out | |
882 | * of every multicast-capable interface that has PIM neighbors. | |
883 | * | |
884 | * So skipping pim interfaces with no neighbors. | |
885 | */ | |
886 | if (listcount(pim_ifp->pim_neighbor_list) == 0) | |
887 | continue; | |
888 | ||
79d97386 | 889 | pim_hello_require(ifp); |
890 | pim_mtu = ifp->mtu - MAX_IP_HDR_LEN; | |
891 | if (pim_mtu < len) { | |
40270c35 | 892 | ret = pim_bsm_frag_send(buf, len, ifp, pim_mtu, |
893 | dst_addr, no_fwd); | |
894 | if (PIM_DEBUG_BSM) | |
895 | zlog_debug("%s: pim_bsm_frag_send returned %s", | |
15569c58 | 896 | __func__, ret ? "TRUE" : "FALSE"); |
79d97386 | 897 | } else { |
898 | pim_msg_build_header(buf, len, PIM_MSG_TYPE_BOOTSTRAP, | |
899 | no_fwd); | |
900 | if (!pim_bsm_send_intf(buf, len, ifp, dst_addr)) { | |
901 | if (PIM_DEBUG_BSM) | |
902 | zlog_debug( | |
2951a7a4 | 903 | "%s: pim_bsm_send_intf returned false", |
15569c58 | 904 | __func__); |
79d97386 | 905 | } |
906 | } | |
907 | } | |
908 | } | |
909 | ||
6bb2ef35 | 910 | bool pim_bsm_new_nbr_fwd(struct pim_neighbor *neigh, struct interface *ifp) |
911 | { | |
912 | struct in_addr dst_addr; | |
913 | struct pim_interface *pim_ifp; | |
914 | struct bsm_scope *scope; | |
915 | struct listnode *bsm_ln; | |
916 | struct bsm_info *bsminfo; | |
917 | char neigh_src_str[INET_ADDRSTRLEN]; | |
918 | uint32_t pim_mtu; | |
919 | bool no_fwd = true; | |
920 | bool ret = false; | |
921 | ||
922 | if (PIM_DEBUG_BSM) { | |
923 | pim_inet4_dump("<src?>", neigh->source_addr, neigh_src_str, | |
924 | sizeof(neigh_src_str)); | |
5e81f5dd DS |
925 | zlog_debug("%s: New neighbor %s seen on %s", __func__, |
926 | neigh_src_str, ifp->name); | |
6bb2ef35 | 927 | } |
928 | ||
929 | pim_ifp = ifp->info; | |
930 | ||
931 | /* DR only forwards BSM packet */ | |
932 | if (pim_ifp->pim_dr_addr.s_addr == pim_ifp->primary_address.s_addr) { | |
933 | if (PIM_DEBUG_BSM) | |
934 | zlog_debug( | |
935 | "%s: It is not DR, so don't forward BSM packet", | |
5e81f5dd | 936 | __func__); |
6bb2ef35 | 937 | } |
938 | ||
939 | if (!pim_ifp->bsm_enable) { | |
940 | if (PIM_DEBUG_BSM) | |
5e81f5dd DS |
941 | zlog_debug("%s: BSM proc not enabled on %s", __func__, |
942 | ifp->name); | |
6bb2ef35 | 943 | return ret; |
944 | } | |
945 | ||
946 | scope = &pim_ifp->pim->global_scope; | |
947 | ||
948 | if (!scope->bsm_list->count) { | |
949 | if (PIM_DEBUG_BSM) | |
950 | zlog_debug("%s: BSM list for the scope is empty", | |
5e81f5dd | 951 | __func__); |
6bb2ef35 | 952 | return ret; |
953 | } | |
954 | ||
955 | if (!pim_ifp->ucast_bsm_accept) { | |
956 | dst_addr = qpim_all_pim_routers_addr; | |
957 | if (PIM_DEBUG_BSM) | |
5e81f5dd DS |
958 | zlog_debug("%s: Sending BSM mcast to %s", __func__, |
959 | neigh_src_str); | |
6bb2ef35 | 960 | } else { |
961 | dst_addr = neigh->source_addr; | |
962 | if (PIM_DEBUG_BSM) | |
5e81f5dd DS |
963 | zlog_debug("%s: Sending BSM ucast to %s", __func__, |
964 | neigh_src_str); | |
6bb2ef35 | 965 | } |
966 | pim_mtu = ifp->mtu - MAX_IP_HDR_LEN; | |
967 | pim_hello_require(ifp); | |
968 | ||
969 | for (ALL_LIST_ELEMENTS_RO(scope->bsm_list, bsm_ln, bsminfo)) { | |
970 | if (pim_mtu < bsminfo->size) { | |
971 | ret = pim_bsm_frag_send(bsminfo->bsm, bsminfo->size, | |
972 | ifp, pim_mtu, dst_addr, no_fwd); | |
973 | if (!ret) { | |
974 | if (PIM_DEBUG_BSM) | |
975 | zlog_debug( | |
976 | "%s: pim_bsm_frag_send failed", | |
5e81f5dd | 977 | __func__); |
6bb2ef35 | 978 | } |
979 | } else { | |
980 | /* Pim header needs to be constructed */ | |
981 | pim_msg_build_header(bsminfo->bsm, bsminfo->size, | |
982 | PIM_MSG_TYPE_BOOTSTRAP, no_fwd); | |
983 | ret = pim_bsm_send_intf(bsminfo->bsm, bsminfo->size, | |
984 | ifp, dst_addr); | |
985 | if (!ret) { | |
986 | if (PIM_DEBUG_BSM) | |
987 | zlog_debug( | |
988 | "%s: pim_bsm_frag_send failed", | |
5e81f5dd | 989 | __func__); |
6bb2ef35 | 990 | } |
991 | } | |
992 | } | |
993 | return ret; | |
994 | } | |
995 | ||
d0e418b4 | 996 | struct bsgrp_node *pim_bsm_get_bsgrp_node(struct bsm_scope *scope, |
997 | struct prefix *grp) | |
998 | { | |
999 | struct route_node *rn; | |
1000 | struct bsgrp_node *bsgrp; | |
1001 | ||
1002 | rn = route_node_lookup(scope->bsrp_table, grp); | |
1003 | if (!rn) { | |
1004 | if (PIM_DEBUG_BSM) | |
1005 | zlog_debug("%s: Route node doesn't exist for the group", | |
15569c58 | 1006 | __func__); |
d0e418b4 | 1007 | return NULL; |
1008 | } | |
1009 | bsgrp = rn->info; | |
1010 | route_unlock_node(rn); | |
1011 | ||
1012 | return bsgrp; | |
1013 | } | |
5acde1cf | 1014 | |
7b3e6ba1 | 1015 | static uint32_t hash_calc_on_grp_rp(struct prefix group, struct in_addr rp, |
1016 | uint8_t hashmasklen) | |
1017 | { | |
1018 | uint64_t temp; | |
1019 | uint32_t hash; | |
1020 | uint32_t grpaddr; | |
1021 | uint32_t rp_add; | |
1022 | uint32_t mask = 0xffffffff; | |
1023 | ||
1024 | /* mask to be made zero if hashmasklen is 0 because mask << 32 | |
1025 | * may not give 0. hashmasklen can be 0 to 32. | |
1026 | */ | |
1027 | if (hashmasklen == 0) | |
1028 | mask = 0; | |
1029 | ||
1030 | /* in_addr stores ip in big endian, hence network byte order | |
1031 | * convert to uint32 before processing hash | |
1032 | */ | |
1033 | grpaddr = ntohl(group.u.prefix4.s_addr); | |
1034 | /* Avoid shifting by 32 bit on a 32 bit register */ | |
1035 | if (hashmasklen) | |
1036 | grpaddr = grpaddr & ((mask << (32 - hashmasklen))); | |
1037 | else | |
1038 | grpaddr = grpaddr & mask; | |
1039 | rp_add = ntohl(rp.s_addr); | |
29f7fc87 DS |
1040 | temp = 1103515245 * ((1103515245 * (uint64_t)grpaddr + 12345) ^ rp_add) |
1041 | + 12345; | |
7b3e6ba1 | 1042 | hash = temp & (0x7fffffff); |
1043 | return hash; | |
1044 | } | |
1045 | ||
1046 | static bool pim_install_bsm_grp_rp(struct pim_instance *pim, | |
1047 | struct bsgrp_node *grpnode, | |
1048 | struct bsmmsg_rpinfo *rp) | |
1049 | { | |
1050 | struct bsm_rpinfo *bsm_rpinfo; | |
1051 | uint8_t hashMask_len = pim->global_scope.hashMasklen; | |
1052 | ||
1053 | /*memory allocation for bsm_rpinfo */ | |
1054 | bsm_rpinfo = XCALLOC(MTYPE_PIM_BSRP_NODE, sizeof(*bsm_rpinfo)); | |
1055 | ||
7b3e6ba1 | 1056 | bsm_rpinfo->rp_prio = rp->rp_pri; |
1057 | bsm_rpinfo->rp_holdtime = rp->rp_holdtime; | |
1058 | memcpy(&bsm_rpinfo->rp_address, &rp->rpaddr.addr, | |
1059 | sizeof(struct in_addr)); | |
1060 | bsm_rpinfo->elapse_time = 0; | |
1061 | ||
1062 | /* Back pointer to the group node. */ | |
1063 | bsm_rpinfo->bsgrp_node = grpnode; | |
1064 | ||
1065 | /* update hash for this rp node */ | |
1066 | bsm_rpinfo->hash = hash_calc_on_grp_rp(grpnode->group, rp->rpaddr.addr, | |
1067 | hashMask_len); | |
1068 | if (listnode_add_sort_nodup(grpnode->partial_bsrp_list, bsm_rpinfo)) { | |
1069 | if (PIM_DEBUG_BSM) | |
1070 | zlog_debug( | |
63efca0e | 1071 | "%s, bs_rpinfo node added to the partial bs_rplist.", |
15569c58 | 1072 | __func__); |
7b3e6ba1 | 1073 | return true; |
1074 | } | |
1075 | ||
1076 | if (PIM_DEBUG_BSM) | |
63efca0e | 1077 | zlog_debug("%s: list node not added", __func__); |
7b3e6ba1 | 1078 | |
1079 | XFREE(MTYPE_PIM_BSRP_NODE, bsm_rpinfo); | |
1080 | return false; | |
1081 | } | |
1082 | ||
1083 | static void pim_update_pending_rp_cnt(struct bsm_scope *sz, | |
1084 | struct bsgrp_node *bsgrp, | |
1085 | uint16_t bsm_frag_tag, | |
1086 | uint32_t total_rp_count) | |
1087 | { | |
1088 | if (bsgrp->pend_rp_cnt) { | |
1089 | /* received bsm is different packet , | |
1090 | * it is not same fragment. | |
1091 | */ | |
1092 | if (bsm_frag_tag != bsgrp->frag_tag) { | |
1093 | if (PIM_DEBUG_BSM) | |
1094 | zlog_debug( | |
63efca0e | 1095 | "%s,Received a new BSM ,so clear the pending bs_rpinfo list.", |
15569c58 | 1096 | __func__); |
7b3e6ba1 | 1097 | list_delete_all_node(bsgrp->partial_bsrp_list); |
1098 | bsgrp->pend_rp_cnt = total_rp_count; | |
1099 | } | |
1100 | } else | |
1101 | bsgrp->pend_rp_cnt = total_rp_count; | |
1102 | ||
1103 | bsgrp->frag_tag = bsm_frag_tag; | |
1104 | } | |
1105 | ||
1106 | /* Parsing BSR packet and adding to partial list of corresponding bsgrp node */ | |
1107 | static bool pim_bsm_parse_install_g2rp(struct bsm_scope *scope, uint8_t *buf, | |
1108 | int buflen, uint16_t bsm_frag_tag) | |
1109 | { | |
1110 | struct bsmmsg_grpinfo grpinfo; | |
1111 | struct bsmmsg_rpinfo rpinfo; | |
1112 | struct prefix group; | |
1113 | struct bsgrp_node *bsgrp = NULL; | |
1114 | int frag_rp_cnt = 0; | |
1115 | int offset = 0; | |
1116 | int ins_count = 0; | |
1117 | ||
1118 | while (buflen > offset) { | |
b1945363 DS |
1119 | if (offset + (int)sizeof(struct bsmmsg_grpinfo) > buflen) { |
1120 | if (PIM_DEBUG_BSM) | |
1121 | zlog_debug( | |
1122 | "%s: buflen received %d is less than the internal data structure of the packet would suggest", | |
15569c58 | 1123 | __func__, buflen); |
b1945363 DS |
1124 | return false; |
1125 | } | |
7b3e6ba1 | 1126 | /* Extract Group tlv from BSM */ |
1127 | memcpy(&grpinfo, buf, sizeof(struct bsmmsg_grpinfo)); | |
1128 | ||
1129 | if (PIM_DEBUG_BSM) { | |
1130 | char grp_str[INET_ADDRSTRLEN]; | |
1131 | ||
1132 | pim_inet4_dump("<Group?>", grpinfo.group.addr, grp_str, | |
1133 | sizeof(grp_str)); | |
1134 | zlog_debug( | |
63efca0e | 1135 | "%s, Group %s Rpcount:%d Fragment-Rp-count:%d", |
15569c58 | 1136 | __func__, grp_str, grpinfo.rp_count, |
7b3e6ba1 | 1137 | grpinfo.frag_rp_count); |
1138 | } | |
1139 | ||
1140 | buf += sizeof(struct bsmmsg_grpinfo); | |
1141 | offset += sizeof(struct bsmmsg_grpinfo); | |
1142 | ||
1143 | if (grpinfo.rp_count == 0) { | |
1144 | if (PIM_DEBUG_BSM) { | |
1145 | char grp_str[INET_ADDRSTRLEN]; | |
1146 | ||
1147 | pim_inet4_dump("<Group?>", grpinfo.group.addr, | |
1148 | grp_str, sizeof(grp_str)); | |
63efca0e DL |
1149 | zlog_debug("%s, Rp count is zero for group: %s", |
1150 | __func__, grp_str); | |
7b3e6ba1 | 1151 | } |
1152 | return false; | |
1153 | } | |
1154 | ||
1155 | group.family = AF_INET; | |
b1945363 DS |
1156 | if (grpinfo.group.mask > IPV4_MAX_BITLEN) { |
1157 | if (PIM_DEBUG_BSM) | |
15569c58 DA |
1158 | zlog_debug( |
1159 | "%s, v4 prefix length specified: %d is too long", | |
1160 | __func__, grpinfo.group.mask); | |
b1945363 DS |
1161 | return false; |
1162 | } | |
7b3e6ba1 | 1163 | group.prefixlen = grpinfo.group.mask; |
1164 | group.u.prefix4.s_addr = grpinfo.group.addr.s_addr; | |
1165 | ||
1166 | /* Get the Group node for the BSM rp table */ | |
1167 | bsgrp = pim_bsm_get_bsgrp_node(scope, &group); | |
1168 | ||
1169 | if (!bsgrp) { | |
1170 | if (PIM_DEBUG_BSM) | |
63efca0e DL |
1171 | zlog_debug("%s, Create new BSM Group node.", |
1172 | __func__); | |
7b3e6ba1 | 1173 | |
1174 | /* create a new node to be added to the tree. */ | |
1175 | bsgrp = pim_bsm_new_bsgrp_node(scope->bsrp_table, | |
1176 | &group); | |
1177 | ||
1178 | if (!bsgrp) { | |
1179 | zlog_debug( | |
63efca0e | 1180 | "%s, Failed to get the BSM group node.", |
15569c58 | 1181 | __func__); |
7b3e6ba1 | 1182 | continue; |
1183 | } | |
1184 | ||
1185 | bsgrp->scope = scope; | |
1186 | } | |
1187 | ||
1188 | pim_update_pending_rp_cnt(scope, bsgrp, bsm_frag_tag, | |
1189 | grpinfo.rp_count); | |
1190 | frag_rp_cnt = grpinfo.frag_rp_count; | |
1191 | ins_count = 0; | |
1192 | ||
1193 | while (frag_rp_cnt--) { | |
b1945363 DS |
1194 | if (offset + (int)sizeof(struct bsmmsg_rpinfo) |
1195 | > buflen) { | |
1196 | if (PIM_DEBUG_BSM) | |
1197 | zlog_debug( | |
1198 | "%s, buflen received: %u is less than the internal data structure of the packet would suggest", | |
15569c58 | 1199 | __func__, buflen); |
b1945363 DS |
1200 | return false; |
1201 | } | |
1202 | ||
7b3e6ba1 | 1203 | /* Extract RP address tlv from BSM */ |
1204 | memcpy(&rpinfo, buf, sizeof(struct bsmmsg_rpinfo)); | |
1205 | rpinfo.rp_holdtime = ntohs(rpinfo.rp_holdtime); | |
1206 | buf += sizeof(struct bsmmsg_rpinfo); | |
1207 | offset += sizeof(struct bsmmsg_rpinfo); | |
1208 | ||
1209 | if (PIM_DEBUG_BSM) { | |
1210 | char rp_str[INET_ADDRSTRLEN]; | |
1211 | ||
1212 | pim_inet4_dump("<Rpaddr?>", rpinfo.rpaddr.addr, | |
1213 | rp_str, sizeof(rp_str)); | |
1214 | zlog_debug( | |
63efca0e | 1215 | "%s, Rp address - %s; pri:%d hold:%d", |
15569c58 DA |
1216 | __func__, rp_str, rpinfo.rp_pri, |
1217 | rpinfo.rp_holdtime); | |
7b3e6ba1 | 1218 | } |
1219 | ||
1220 | /* Call Install api to update grp-rp mappings */ | |
1221 | if (pim_install_bsm_grp_rp(scope->pim, bsgrp, &rpinfo)) | |
1222 | ins_count++; | |
1223 | } | |
1224 | ||
1225 | bsgrp->pend_rp_cnt -= ins_count; | |
1226 | ||
1227 | if (!bsgrp->pend_rp_cnt) { | |
1228 | if (PIM_DEBUG_BSM) | |
1229 | zlog_debug( | |
1230 | "%s, Recvd all the rps for this group, so bsrp list with penidng rp list.", | |
15569c58 | 1231 | __func__); |
20fd30e5 | 1232 | /* replace the bsrp_list with pending list */ |
1233 | pim_instate_pend_list(bsgrp); | |
7b3e6ba1 | 1234 | } |
1235 | } | |
1236 | return true; | |
1237 | } | |
1238 | ||
5acde1cf | 1239 | int pim_bsm_process(struct interface *ifp, struct ip *ip_hdr, uint8_t *buf, |
1240 | uint32_t buf_size, bool no_fwd) | |
1241 | { | |
1242 | struct bsm_hdr *bshdr; | |
79d97386 | 1243 | int sz = PIM_GBL_SZ_ID; |
5acde1cf | 1244 | struct bsmmsg_grpinfo *msg_grp; |
1245 | struct pim_interface *pim_ifp = NULL; | |
79d97386 | 1246 | struct bsm_info *bsminfo; |
5acde1cf | 1247 | struct pim_instance *pim; |
1248 | char bsr_str[INET_ADDRSTRLEN]; | |
1249 | uint16_t frag_tag; | |
2951a7a4 | 1250 | bool empty_bsm = false; |
5acde1cf | 1251 | |
1252 | /* BSM Packet acceptance validation */ | |
1253 | pim_ifp = ifp->info; | |
1254 | if (!pim_ifp) { | |
1255 | if (PIM_DEBUG_BSM) | |
1256 | zlog_debug("%s: multicast not enabled on interface %s", | |
15569c58 | 1257 | __func__, ifp->name); |
5acde1cf | 1258 | return -1; |
1259 | } | |
1260 | ||
1261 | pim_ifp->pim_ifstat_bsm_rx++; | |
1262 | pim = pim_ifp->pim; | |
1263 | pim->bsm_rcvd++; | |
1264 | ||
1265 | /* Drop if bsm processing is disabled on interface */ | |
1266 | if (!pim_ifp->bsm_enable) { | |
15569c58 DA |
1267 | zlog_warn("%s: BSM not enabled on interface %s", __func__, |
1268 | ifp->name); | |
5acde1cf | 1269 | pim_ifp->pim_ifstat_bsm_cfg_miss++; |
1270 | pim->bsm_dropped++; | |
1271 | return -1; | |
1272 | } | |
1273 | ||
d83a854b | 1274 | if (buf_size < (PIM_MSG_HEADER_LEN + sizeof(struct bsm_hdr))) { |
b1945363 | 1275 | if (PIM_DEBUG_BSM) |
15569c58 DA |
1276 | zlog_debug( |
1277 | "%s: received buffer length of %d which is too small to properly decode", | |
1278 | __func__, buf_size); | |
b1945363 DS |
1279 | return -1; |
1280 | } | |
1281 | ||
5acde1cf | 1282 | bshdr = (struct bsm_hdr *)(buf + PIM_MSG_HEADER_LEN); |
1283 | pim_inet4_dump("<bsr?>", bshdr->bsr_addr.addr, bsr_str, | |
1284 | sizeof(bsr_str)); | |
817f8933 | 1285 | if (bshdr->hm_len > 32) { |
6cde4b45 | 1286 | zlog_warn("Bad hashmask length for IPv4; got %hhu, expected value in range 0-32", |
817f8933 QY |
1287 | bshdr->hm_len); |
1288 | pim->bsm_dropped++; | |
1289 | return -1; | |
1290 | } | |
5acde1cf | 1291 | pim->global_scope.hashMasklen = bshdr->hm_len; |
1292 | frag_tag = ntohs(bshdr->frag_tag); | |
1293 | ||
1294 | /* Identify empty BSM */ | |
1295 | if ((buf_size - PIM_BSM_HDR_LEN - PIM_MSG_HEADER_LEN) < PIM_BSM_GRP_LEN) | |
1296 | empty_bsm = true; | |
1297 | ||
1298 | if (!empty_bsm) { | |
1299 | msg_grp = (struct bsmmsg_grpinfo *)(buf + PIM_MSG_HEADER_LEN | |
1300 | + PIM_BSM_HDR_LEN); | |
1301 | /* Currently we don't support scope zoned BSM */ | |
1302 | if (msg_grp->group.sz) { | |
1303 | if (PIM_DEBUG_BSM) | |
1304 | zlog_debug( | |
1305 | "%s : Administratively scoped range BSM received", | |
15569c58 | 1306 | __func__); |
5acde1cf | 1307 | pim_ifp->pim_ifstat_bsm_invalid_sz++; |
1308 | pim->bsm_dropped++; | |
1309 | return -1; | |
1310 | } | |
1311 | } | |
1312 | ||
1313 | /* Drop if bsr is not preferred bsr */ | |
1314 | if (!is_preferred_bsr(pim, bshdr->bsr_addr.addr, bshdr->bsr_prio)) { | |
1315 | if (PIM_DEBUG_BSM) | |
1316 | zlog_debug("%s : Received a non-preferred BSM", | |
15569c58 | 1317 | __func__); |
5acde1cf | 1318 | pim->bsm_dropped++; |
1319 | return -1; | |
1320 | } | |
1321 | ||
1322 | if (no_fwd) { | |
1323 | /* only accept no-forward BSM if quick refresh on startup */ | |
1324 | if ((pim->global_scope.accept_nofwd_bsm) | |
1325 | || (frag_tag == pim->global_scope.bsm_frag_tag)) { | |
1326 | pim->global_scope.accept_nofwd_bsm = false; | |
1327 | } else { | |
1328 | if (PIM_DEBUG_BSM) | |
1329 | zlog_debug( | |
1330 | "%s : nofwd_bsm received on %s when accpt_nofwd_bsm false", | |
15569c58 | 1331 | __func__, bsr_str); |
5acde1cf | 1332 | pim->bsm_dropped++; |
1333 | pim_ifp->pim_ifstat_ucast_bsm_cfg_miss++; | |
1334 | return -1; | |
1335 | } | |
1336 | } | |
1337 | ||
1338 | /* Mulicast BSM received */ | |
1339 | if (ip_hdr->ip_dst.s_addr == qpim_all_pim_routers_addr.s_addr) { | |
1340 | if (!no_fwd) { | |
1341 | if (!pim_bsr_rpf_check(pim, bshdr->bsr_addr.addr, | |
1342 | ip_hdr->ip_src)) { | |
1343 | if (PIM_DEBUG_BSM) | |
1344 | zlog_debug( | |
1345 | "%s : RPF check fail for BSR address %s", | |
15569c58 | 1346 | __func__, bsr_str); |
5acde1cf | 1347 | pim->bsm_dropped++; |
1348 | return -1; | |
1349 | } | |
1350 | } | |
1351 | } else if (if_lookup_exact_address(&ip_hdr->ip_dst, AF_INET, | |
1352 | pim->vrf_id)) { | |
1353 | /* Unicast BSM received - if ucast bsm not enabled on | |
1354 | * the interface, drop it | |
1355 | */ | |
1356 | if (!pim_ifp->ucast_bsm_accept) { | |
1357 | if (PIM_DEBUG_BSM) | |
1358 | zlog_debug( | |
1359 | "%s : Unicast BSM not enabled on interface %s", | |
15569c58 | 1360 | __func__, ifp->name); |
5acde1cf | 1361 | pim_ifp->pim_ifstat_ucast_bsm_cfg_miss++; |
1362 | pim->bsm_dropped++; | |
1363 | return -1; | |
1364 | } | |
1365 | ||
1366 | } else { | |
1367 | if (PIM_DEBUG_BSM) | |
1368 | zlog_debug("%s : Invalid destination address", | |
15569c58 | 1369 | __func__); |
5acde1cf | 1370 | pim->bsm_dropped++; |
1371 | return -1; | |
1372 | } | |
1373 | ||
1374 | if (empty_bsm) { | |
1375 | if (PIM_DEBUG_BSM) | |
15569c58 | 1376 | zlog_debug("%s : Empty Pref BSM received", __func__); |
5acde1cf | 1377 | } |
7b3e6ba1 | 1378 | /* Parse Update bsm rp table and install/uninstall rp if required */ |
1379 | if (!pim_bsm_parse_install_g2rp( | |
1380 | &pim_ifp->pim->global_scope, | |
1381 | (buf + PIM_BSM_HDR_LEN + PIM_MSG_HEADER_LEN), | |
1382 | (buf_size - PIM_BSM_HDR_LEN - PIM_MSG_HEADER_LEN), | |
1383 | frag_tag)) { | |
1384 | if (PIM_DEBUG_BSM) { | |
63efca0e | 1385 | zlog_debug("%s, Parsing BSM failed.", __func__); |
7b3e6ba1 | 1386 | } |
1387 | pim->bsm_dropped++; | |
1388 | return -1; | |
1389 | } | |
5acde1cf | 1390 | /* Restart the bootstrap timer */ |
1391 | pim_bs_timer_restart(&pim_ifp->pim->global_scope, | |
1392 | PIM_BSR_DEFAULT_TIMEOUT); | |
1393 | ||
1394 | /* If new BSM received, clear the old bsm database */ | |
1395 | if (pim_ifp->pim->global_scope.bsm_frag_tag != frag_tag) { | |
1396 | if (PIM_DEBUG_BSM) { | |
1397 | zlog_debug("%s: Current frag tag: %d Frag teg rcvd: %d", | |
15569c58 | 1398 | __func__, |
5acde1cf | 1399 | pim_ifp->pim->global_scope.bsm_frag_tag, |
1400 | frag_tag); | |
1401 | } | |
1402 | list_delete_all_node(pim_ifp->pim->global_scope.bsm_list); | |
1403 | pim_ifp->pim->global_scope.bsm_frag_tag = frag_tag; | |
1404 | } | |
1405 | ||
1406 | /* update the scope information from bsm */ | |
1407 | pim_bsm_update(pim, bshdr->bsr_addr.addr, bshdr->bsr_prio); | |
79d97386 | 1408 | |
1409 | if (!no_fwd) { | |
1410 | pim_bsm_fwd_whole_sz(pim_ifp->pim, buf, buf_size, sz); | |
1411 | bsminfo = XCALLOC(MTYPE_PIM_BSM_INFO, sizeof(struct bsm_info)); | |
79d97386 | 1412 | |
1413 | bsminfo->bsm = XCALLOC(MTYPE_PIM_BSM_PKT_VAR_MEM, buf_size); | |
79d97386 | 1414 | |
1415 | bsminfo->size = buf_size; | |
1416 | memcpy(bsminfo->bsm, buf, buf_size); | |
1417 | listnode_add(pim_ifp->pim->global_scope.bsm_list, bsminfo); | |
1418 | } | |
1419 | ||
5acde1cf | 1420 | return 0; |
1421 | } |