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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" |
e34e07e6 | 31 | #include "pim_neighbor.h" |
361b5843 | 32 | #include "pim_rpf.h" |
33 | #include "pim_hello.h" | |
34 | #include "pim_pim.h" | |
35 | #include "pim_nht.h" | |
36 | #include "pim_bsm.h" | |
37 | #include "pim_time.h" | |
38 | ||
39 | /* Functions forward declaration */ | |
40 | static void pim_bs_timer_start(struct bsm_scope *scope, int bs_timeout); | |
a5164e97 | 41 | static void pim_g2rp_timer_start(struct bsm_rpinfo *bsrp, int hold_time); |
42 | static inline void pim_g2rp_timer_restart(struct bsm_rpinfo *bsrp, | |
43 | int hold_time); | |
23255dfd | 44 | |
45 | /* Memory Types */ | |
bf8d3d6a | 46 | DEFINE_MTYPE_STATIC(PIMD, PIM_BSGRP_NODE, "PIM BSR advertised grp info"); |
fdab2940 | 47 | DEFINE_MTYPE_STATIC(PIMD, PIM_BSRP_INFO, "PIM BSR advertised RP info"); |
d4a4525c | 48 | DEFINE_MTYPE_STATIC(PIMD, PIM_BSM_FRAG, "PIM BSM fragment"); |
bf8d3d6a | 49 | DEFINE_MTYPE_STATIC(PIMD, PIM_BSM_PKT_VAR_MEM, "PIM BSM Packet"); |
361b5843 | 50 | |
79d97386 | 51 | /* All bsm packets forwarded shall be fit within ip mtu less iphdr(max) */ |
52 | #define MAX_IP_HDR_LEN 24 | |
53 | ||
16c926c8 | 54 | /* pim_bsm_write_config - Write the interface pim bsm configuration.*/ |
d0e418b4 | 55 | void pim_bsm_write_config(struct vty *vty, struct interface *ifp) |
16c926c8 | 56 | { |
57 | struct pim_interface *pim_ifp = ifp->info; | |
58 | ||
59 | if (pim_ifp) { | |
60 | if (!pim_ifp->bsm_enable) | |
61 | vty_out(vty, " no ip pim bsm\n"); | |
62 | if (!pim_ifp->ucast_bsm_accept) | |
63 | vty_out(vty, " no ip pim unicast-bsm\n"); | |
64 | } | |
65 | } | |
66 | ||
fdab2940 DL |
67 | static void pim_bsm_rpinfo_free(struct bsm_rpinfo *bsrp_info) |
68 | { | |
69 | THREAD_OFF(bsrp_info->g2rp_timer); | |
70 | XFREE(MTYPE_PIM_BSRP_INFO, bsrp_info); | |
71 | } | |
72 | ||
73 | void pim_bsm_rpinfos_free(struct bsm_rpinfos_head *head) | |
74 | { | |
75 | struct bsm_rpinfo *bsrp_info; | |
76 | ||
77 | while ((bsrp_info = bsm_rpinfos_pop(head))) | |
78 | pim_bsm_rpinfo_free(bsrp_info); | |
79 | } | |
80 | ||
e7016ceb | 81 | void pim_free_bsgrp_data(struct bsgrp_node *bsgrp_node) |
361b5843 | 82 | { |
fdab2940 DL |
83 | pim_bsm_rpinfos_free(bsgrp_node->bsrp_list); |
84 | pim_bsm_rpinfos_free(bsgrp_node->partial_bsrp_list); | |
361b5843 | 85 | XFREE(MTYPE_PIM_BSGRP_NODE, bsgrp_node); |
86 | } | |
87 | ||
e7016ceb | 88 | void pim_free_bsgrp_node(struct route_table *rt, struct prefix *grp) |
c295e391 | 89 | { |
90 | struct route_node *rn; | |
91 | ||
92 | rn = route_node_lookup(rt, grp); | |
93 | if (rn) { | |
94 | rn->info = NULL; | |
95 | route_unlock_node(rn); | |
96 | route_unlock_node(rn); | |
97 | } | |
98 | } | |
99 | ||
d4a4525c | 100 | static void pim_bsm_frag_free(struct bsm_frag *bsfrag) |
361b5843 | 101 | { |
d4a4525c DL |
102 | XFREE(MTYPE_PIM_BSM_FRAG, bsfrag); |
103 | } | |
104 | ||
105 | void pim_bsm_frags_free(struct bsm_scope *scope) | |
106 | { | |
107 | struct bsm_frag *bsfrag; | |
108 | ||
109 | while ((bsfrag = bsm_frags_pop(scope->bsm_frags))) | |
110 | pim_bsm_frag_free(bsfrag); | |
361b5843 | 111 | } |
112 | ||
fdab2940 DL |
113 | int pim_bsm_rpinfo_cmp(const struct bsm_rpinfo *node1, |
114 | const struct bsm_rpinfo *node2) | |
7b3e6ba1 | 115 | { |
116 | /* RP election Algo : | |
117 | * Step-1 : Loweset Rp priority will have higher precedance. | |
118 | * Step-2 : If priority same then higher hash val will have | |
119 | * higher precedance. | |
120 | * Step-3 : If Hash val is same then highest rp address will | |
121 | * become elected RP. | |
122 | */ | |
123 | if (node1->rp_prio < node2->rp_prio) | |
124 | return -1; | |
125 | if (node1->rp_prio > node2->rp_prio) | |
126 | return 1; | |
127 | if (node1->hash < node2->hash) | |
128 | return 1; | |
129 | if (node1->hash > node2->hash) | |
130 | return -1; | |
131 | if (node1->rp_address.s_addr < node2->rp_address.s_addr) | |
132 | return 1; | |
133 | if (node1->rp_address.s_addr > node2->rp_address.s_addr) | |
134 | return -1; | |
135 | return 0; | |
136 | } | |
137 | ||
7b3e6ba1 | 138 | static struct bsgrp_node *pim_bsm_new_bsgrp_node(struct route_table *rt, |
139 | struct prefix *grp) | |
140 | { | |
141 | struct route_node *rn; | |
142 | struct bsgrp_node *bsgrp; | |
143 | ||
144 | rn = route_node_get(rt, grp); | |
145 | if (!rn) { | |
15569c58 | 146 | zlog_warn("%s: route node creation failed", __func__); |
7b3e6ba1 | 147 | return NULL; |
148 | } | |
149 | bsgrp = XCALLOC(MTYPE_PIM_BSGRP_NODE, sizeof(struct bsgrp_node)); | |
150 | ||
7b3e6ba1 | 151 | rn->info = bsgrp; |
fdab2940 DL |
152 | bsm_rpinfos_init(bsgrp->bsrp_list); |
153 | bsm_rpinfos_init(bsgrp->partial_bsrp_list); | |
7b3e6ba1 | 154 | |
155 | prefix_copy(&bsgrp->group, grp); | |
156 | return bsgrp; | |
157 | } | |
158 | ||
23255dfd | 159 | static int pim_on_bs_timer(struct thread *t) |
160 | { | |
c843f56d | 161 | struct route_node *rn; |
162 | struct bsm_scope *scope; | |
163 | struct bsgrp_node *bsgrp_node; | |
164 | struct bsm_rpinfo *bsrp; | |
c843f56d | 165 | |
166 | scope = THREAD_ARG(t); | |
167 | THREAD_OFF(scope->bs_timer); | |
168 | ||
169 | if (PIM_DEBUG_BSM) | |
170 | zlog_debug("%s: Bootstrap Timer expired for scope: %d", | |
15569c58 | 171 | __func__, scope->sz_id); |
c843f56d | 172 | |
4efdb9c6 | 173 | pim_nht_bsr_del(scope->pim, scope->current_bsr); |
c843f56d | 174 | |
175 | /* Reset scope zone data */ | |
176 | scope->accept_nofwd_bsm = false; | |
177 | scope->state = ACCEPT_ANY; | |
178 | scope->current_bsr.s_addr = INADDR_ANY; | |
179 | scope->current_bsr_prio = 0; | |
180 | scope->current_bsr_first_ts = 0; | |
181 | scope->current_bsr_last_ts = 0; | |
182 | scope->bsm_frag_tag = 0; | |
d4a4525c | 183 | pim_bsm_frags_free(scope); |
c843f56d | 184 | |
185 | for (rn = route_top(scope->bsrp_table); rn; rn = route_next(rn)) { | |
186 | ||
187 | bsgrp_node = (struct bsgrp_node *)rn->info; | |
188 | if (!bsgrp_node) { | |
189 | if (PIM_DEBUG_BSM) | |
15569c58 | 190 | zlog_debug("%s: bsgrp_node is null", __func__); |
c843f56d | 191 | continue; |
192 | } | |
193 | /* Give grace time for rp to continue for another hold time */ | |
fdab2940 DL |
194 | bsrp = bsm_rpinfos_first(bsgrp_node->bsrp_list); |
195 | if (bsrp) | |
c843f56d | 196 | pim_g2rp_timer_restart(bsrp, bsrp->rp_holdtime); |
fdab2940 | 197 | |
c843f56d | 198 | /* clear pending list */ |
fdab2940 DL |
199 | pim_bsm_rpinfos_free(bsgrp_node->partial_bsrp_list); |
200 | bsgrp_node->pend_rp_cnt = 0; | |
c843f56d | 201 | } |
23255dfd | 202 | return 0; |
203 | } | |
204 | ||
e7016ceb | 205 | void pim_bs_timer_stop(struct bsm_scope *scope) |
23255dfd | 206 | { |
207 | if (PIM_DEBUG_BSM) | |
15569c58 DA |
208 | zlog_debug("%s : BS timer being stopped of sz: %d", __func__, |
209 | scope->sz_id); | |
23255dfd | 210 | THREAD_OFF(scope->bs_timer); |
211 | } | |
212 | ||
213 | static void pim_bs_timer_start(struct bsm_scope *scope, int bs_timeout) | |
214 | { | |
215 | if (!scope) { | |
216 | if (PIM_DEBUG_BSM) | |
15569c58 | 217 | zlog_debug("%s : Invalid scope(NULL).", __func__); |
23255dfd | 218 | return; |
219 | } | |
220 | THREAD_OFF(scope->bs_timer); | |
221 | if (PIM_DEBUG_BSM) | |
15569c58 DA |
222 | zlog_debug( |
223 | "%s : starting bs timer for scope %d with timeout %d secs", | |
224 | __func__, scope->sz_id, bs_timeout); | |
23255dfd | 225 | thread_add_timer(router->master, pim_on_bs_timer, scope, bs_timeout, |
226 | &scope->bs_timer); | |
227 | } | |
228 | ||
5acde1cf | 229 | static inline void pim_bs_timer_restart(struct bsm_scope *scope, int bs_timeout) |
230 | { | |
231 | pim_bs_timer_start(scope, bs_timeout); | |
232 | } | |
233 | ||
361b5843 | 234 | void pim_bsm_proc_init(struct pim_instance *pim) |
235 | { | |
236 | memset(&pim->global_scope, 0, sizeof(struct bsm_scope)); | |
237 | ||
238 | pim->global_scope.sz_id = PIM_GBL_SZ_ID; | |
239 | pim->global_scope.bsrp_table = route_table_init(); | |
240 | pim->global_scope.accept_nofwd_bsm = true; | |
241 | pim->global_scope.state = NO_INFO; | |
242 | pim->global_scope.pim = pim; | |
d4a4525c | 243 | bsm_frags_init(pim->global_scope.bsm_frags); |
361b5843 | 244 | pim_bs_timer_start(&pim->global_scope, PIM_BS_TIME); |
245 | } | |
246 | ||
247 | void pim_bsm_proc_free(struct pim_instance *pim) | |
248 | { | |
249 | struct route_node *rn; | |
250 | struct bsgrp_node *bsgrp; | |
251 | ||
252 | pim_bs_timer_stop(&pim->global_scope); | |
d4a4525c | 253 | pim_bsm_frags_free(&pim->global_scope); |
361b5843 | 254 | |
d0e418b4 | 255 | for (rn = route_top(pim->global_scope.bsrp_table); rn; |
256 | rn = route_next(rn)) { | |
361b5843 | 257 | bsgrp = rn->info; |
258 | if (!bsgrp) | |
259 | continue; | |
260 | pim_free_bsgrp_data(bsgrp); | |
261 | } | |
262 | ||
4d19a911 | 263 | route_table_finish(pim->global_scope.bsrp_table); |
361b5843 | 264 | } |
265 | ||
c295e391 | 266 | static bool is_hold_time_elapsed(void *data) |
267 | { | |
268 | struct bsm_rpinfo *bsrp; | |
269 | ||
270 | bsrp = data; | |
271 | ||
272 | if (bsrp->elapse_time < bsrp->rp_holdtime) | |
273 | return false; | |
274 | else | |
275 | return true; | |
276 | } | |
277 | ||
a5164e97 | 278 | static int pim_on_g2rp_timer(struct thread *t) |
279 | { | |
c295e391 | 280 | struct bsm_rpinfo *bsrp; |
281 | struct bsm_rpinfo *bsrp_node; | |
282 | struct bsgrp_node *bsgrp_node; | |
c295e391 | 283 | struct pim_instance *pim; |
284 | struct rp_info *rp_info; | |
285 | struct route_node *rn; | |
286 | uint16_t elapse; | |
287 | struct in_addr bsrp_addr; | |
288 | ||
289 | bsrp = THREAD_ARG(t); | |
290 | THREAD_OFF(bsrp->g2rp_timer); | |
291 | bsgrp_node = bsrp->bsgrp_node; | |
292 | ||
293 | /* elapse time is the hold time of expired node */ | |
294 | elapse = bsrp->rp_holdtime; | |
295 | bsrp_addr = bsrp->rp_address; | |
296 | ||
297 | /* update elapse for all bsrp nodes */ | |
fdab2940 | 298 | frr_each_safe (bsm_rpinfos, bsgrp_node->bsrp_list, bsrp_node) { |
c295e391 | 299 | bsrp_node->elapse_time += elapse; |
300 | ||
fdab2940 DL |
301 | if (is_hold_time_elapsed(bsrp_node)) { |
302 | bsm_rpinfos_del(bsgrp_node->bsrp_list, bsrp_node); | |
303 | pim_bsm_rpinfo_free(bsrp_node); | |
304 | } | |
305 | } | |
c295e391 | 306 | |
307 | /* Get the next elected rp node */ | |
fdab2940 | 308 | bsrp = bsm_rpinfos_first(bsgrp_node->bsrp_list); |
c295e391 | 309 | pim = bsgrp_node->scope->pim; |
310 | rn = route_node_lookup(pim->rp_table, &bsgrp_node->group); | |
311 | ||
312 | if (!rn) { | |
5e81f5dd | 313 | zlog_warn("%s: Route node doesn't exist", __func__); |
c295e391 | 314 | return 0; |
315 | } | |
316 | ||
317 | rp_info = (struct rp_info *)rn->info; | |
318 | ||
319 | if (!rp_info) { | |
320 | route_unlock_node(rn); | |
321 | return 0; | |
322 | } | |
323 | ||
324 | if (rp_info->rp_src != RP_SRC_STATIC) { | |
325 | /* If new rp available, change it else delete the existing */ | |
326 | if (bsrp) { | |
327 | bsrp_addr = bsrp->rp_address; | |
328 | pim_g2rp_timer_start( | |
329 | bsrp, (bsrp->rp_holdtime - bsrp->elapse_time)); | |
330 | pim_rp_change(pim, bsrp_addr, bsgrp_node->group, | |
331 | RP_SRC_BSR); | |
332 | } else { | |
333 | pim_rp_del(pim, bsrp_addr, bsgrp_node->group, NULL, | |
334 | RP_SRC_BSR); | |
335 | } | |
336 | } | |
337 | ||
fdab2940 DL |
338 | if (!bsm_rpinfos_count(bsgrp_node->bsrp_list) |
339 | && !bsm_rpinfos_count(bsgrp_node->partial_bsrp_list)) { | |
c295e391 | 340 | pim_free_bsgrp_node(pim->global_scope.bsrp_table, |
341 | &bsgrp_node->group); | |
342 | pim_free_bsgrp_data(bsgrp_node); | |
343 | } | |
344 | ||
a5164e97 | 345 | return 0; |
346 | } | |
347 | ||
348 | static void pim_g2rp_timer_start(struct bsm_rpinfo *bsrp, int hold_time) | |
349 | { | |
350 | if (!bsrp) { | |
351 | if (PIM_DEBUG_BSM) | |
15569c58 | 352 | zlog_debug("%s : Invalid brsp(NULL).", __func__); |
a5164e97 | 353 | return; |
354 | } | |
355 | THREAD_OFF(bsrp->g2rp_timer); | |
2dbe669b | 356 | if (PIM_DEBUG_BSM) |
a5164e97 | 357 | zlog_debug( |
ee2bbf7c | 358 | "%s : starting g2rp timer for grp: %pFX - rp: %pI4 with timeout %d secs(Actual Hold time : %d secs)", |
2dbe669b | 359 | __func__, &bsrp->bsgrp_node->group, |
ee2bbf7c | 360 | &bsrp->rp_address, hold_time, |
a5164e97 | 361 | bsrp->rp_holdtime); |
a5164e97 | 362 | |
363 | thread_add_timer(router->master, pim_on_g2rp_timer, bsrp, hold_time, | |
364 | &bsrp->g2rp_timer); | |
365 | } | |
366 | ||
367 | static inline void pim_g2rp_timer_restart(struct bsm_rpinfo *bsrp, | |
368 | int hold_time) | |
369 | { | |
370 | pim_g2rp_timer_start(bsrp, hold_time); | |
371 | } | |
372 | ||
20fd30e5 | 373 | static void pim_g2rp_timer_stop(struct bsm_rpinfo *bsrp) |
374 | { | |
375 | if (!bsrp) | |
376 | return; | |
377 | ||
2dbe669b | 378 | if (PIM_DEBUG_BSM) |
ee2bbf7c | 379 | zlog_debug("%s : stopping g2rp timer for grp: %pFX - rp: %pI4", |
2dbe669b | 380 | __func__, &bsrp->bsgrp_node->group, |
ee2bbf7c | 381 | &bsrp->rp_address); |
20fd30e5 | 382 | |
383 | THREAD_OFF(bsrp->g2rp_timer); | |
384 | } | |
385 | ||
386 | static bool is_hold_time_zero(void *data) | |
387 | { | |
388 | struct bsm_rpinfo *bsrp; | |
389 | ||
390 | bsrp = data; | |
391 | ||
392 | if (bsrp->rp_holdtime) | |
393 | return false; | |
394 | else | |
395 | return true; | |
396 | } | |
397 | ||
398 | static void pim_instate_pend_list(struct bsgrp_node *bsgrp_node) | |
399 | { | |
400 | struct bsm_rpinfo *active; | |
401 | struct bsm_rpinfo *pend; | |
20fd30e5 | 402 | struct rp_info *rp_info; |
403 | struct route_node *rn; | |
404 | struct pim_instance *pim; | |
405 | struct rp_info *rp_all; | |
406 | struct prefix group_all; | |
407 | bool had_rp_node = true; | |
408 | ||
409 | pim = bsgrp_node->scope->pim; | |
fdab2940 | 410 | active = bsm_rpinfos_first(bsgrp_node->bsrp_list); |
20fd30e5 | 411 | |
412 | /* Remove nodes with hold time 0 & check if list still has a head */ | |
5f1808ac DS |
413 | frr_each_safe (bsm_rpinfos, bsgrp_node->partial_bsrp_list, pend) { |
414 | if (is_hold_time_zero(pend)) { | |
fdab2940 | 415 | bsm_rpinfos_del(bsgrp_node->partial_bsrp_list, pend); |
5f1808ac DS |
416 | pim_bsm_rpinfo_free(pend); |
417 | } | |
418 | } | |
fdab2940 DL |
419 | |
420 | pend = bsm_rpinfos_first(bsgrp_node->partial_bsrp_list); | |
20fd30e5 | 421 | |
422 | if (!str2prefix("224.0.0.0/4", &group_all)) | |
423 | return; | |
424 | ||
425 | rp_all = pim_rp_find_match_group(pim, &group_all); | |
426 | rn = route_node_lookup(pim->rp_table, &bsgrp_node->group); | |
427 | ||
428 | if (pend) | |
429 | pim_g2rp_timer_start(pend, pend->rp_holdtime); | |
430 | ||
431 | /* if rp node doesn't exist or exist but not configured(rp_all), | |
432 | * install the rp from head(if exists) of partial list. List is | |
433 | * is sorted such that head is the elected RP for the group. | |
434 | */ | |
435 | if (!rn || (prefix_same(&rp_all->group, &bsgrp_node->group) | |
436 | && pim_rpf_addr_is_inaddr_none(&rp_all->rp))) { | |
437 | if (PIM_DEBUG_BSM) | |
15569c58 | 438 | zlog_debug("%s: Route node doesn't exist", __func__); |
20fd30e5 | 439 | if (pend) |
440 | pim_rp_new(pim, pend->rp_address, bsgrp_node->group, | |
441 | NULL, RP_SRC_BSR); | |
442 | had_rp_node = false; | |
443 | } else { | |
444 | rp_info = (struct rp_info *)rn->info; | |
445 | if (!rp_info) { | |
446 | route_unlock_node(rn); | |
447 | if (pend) | |
448 | pim_rp_new(pim, pend->rp_address, | |
449 | bsgrp_node->group, NULL, RP_SRC_BSR); | |
450 | had_rp_node = false; | |
451 | } | |
452 | } | |
453 | ||
454 | /* We didn't have rp node and pending list is empty(unlikely), cleanup*/ | |
455 | if ((!had_rp_node) && (!pend)) { | |
456 | pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table, | |
457 | &bsgrp_node->group); | |
458 | pim_free_bsgrp_data(bsgrp_node); | |
459 | return; | |
460 | } | |
461 | ||
462 | if ((had_rp_node) && (rp_info->rp_src != RP_SRC_STATIC)) { | |
463 | /* This means we searched and got rp node, needs unlock */ | |
464 | route_unlock_node(rn); | |
465 | ||
466 | if (active && pend) { | |
467 | if ((active->rp_address.s_addr | |
468 | != pend->rp_address.s_addr)) | |
469 | pim_rp_change(pim, pend->rp_address, | |
470 | bsgrp_node->group, RP_SRC_BSR); | |
471 | } | |
472 | ||
473 | /* Possible when the first BSM has group with 0 rp count */ | |
474 | if ((!active) && (!pend)) { | |
475 | if (PIM_DEBUG_BSM) { | |
476 | zlog_debug( | |
477 | "%s: Both bsrp and partial list are empty", | |
15569c58 | 478 | __func__); |
20fd30e5 | 479 | } |
480 | pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table, | |
481 | &bsgrp_node->group); | |
482 | pim_free_bsgrp_data(bsgrp_node); | |
483 | return; | |
484 | } | |
485 | ||
486 | /* Possible when a group with 0 rp count received in BSM */ | |
487 | if ((active) && (!pend)) { | |
488 | pim_rp_del(pim, active->rp_address, bsgrp_node->group, | |
489 | NULL, RP_SRC_BSR); | |
490 | pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table, | |
491 | &bsgrp_node->group); | |
492 | if (PIM_DEBUG_BSM) { | |
493 | zlog_debug("%s:Pend List is null,del grp node", | |
15569c58 | 494 | __func__); |
20fd30e5 | 495 | } |
496 | pim_free_bsgrp_data(bsgrp_node); | |
497 | return; | |
498 | } | |
499 | } | |
500 | ||
501 | if ((had_rp_node) && (rp_info->rp_src == RP_SRC_STATIC)) { | |
502 | /* We need to unlock rn this case */ | |
503 | route_unlock_node(rn); | |
504 | /* there is a chance that static rp exist and bsrp cleaned | |
505 | * so clean bsgrp node if pending list empty | |
506 | */ | |
507 | if (!pend) { | |
508 | if (PIM_DEBUG_BSM) | |
509 | zlog_debug( | |
510 | "%s: Partial list is empty, static rp exists", | |
15569c58 | 511 | __func__); |
20fd30e5 | 512 | pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table, |
513 | &bsgrp_node->group); | |
514 | pim_free_bsgrp_data(bsgrp_node); | |
515 | return; | |
516 | } | |
517 | } | |
518 | ||
519 | /* swap the list & delete all nodes in partial list (old bsrp_list) | |
520 | * before swap | |
521 | * active is head of bsrp list | |
522 | * pend is head of partial list | |
523 | * After swap | |
524 | * active is head of partial list | |
525 | * pend is head of bsrp list | |
526 | * So check appriate head after swap and clean the new partial list | |
527 | */ | |
fdab2940 DL |
528 | bsm_rpinfos_swap_all(bsgrp_node->bsrp_list, |
529 | bsgrp_node->partial_bsrp_list); | |
20fd30e5 | 530 | |
fdab2940 | 531 | if (active) |
20fd30e5 | 532 | pim_g2rp_timer_stop(active); |
fdab2940 | 533 | pim_bsm_rpinfos_free(bsgrp_node->partial_bsrp_list); |
20fd30e5 | 534 | } |
535 | ||
5acde1cf | 536 | static bool is_preferred_bsr(struct pim_instance *pim, struct in_addr bsr, |
537 | uint32_t bsr_prio) | |
538 | { | |
539 | if (bsr.s_addr == pim->global_scope.current_bsr.s_addr) | |
540 | return true; | |
541 | ||
542 | if (bsr_prio > pim->global_scope.current_bsr_prio) | |
543 | return true; | |
544 | ||
545 | else if (bsr_prio == pim->global_scope.current_bsr_prio) { | |
e34c4619 | 546 | if (ntohl(bsr.s_addr) |
547 | >= ntohl(pim->global_scope.current_bsr.s_addr)) | |
5acde1cf | 548 | return true; |
549 | else | |
550 | return false; | |
551 | } else | |
552 | return false; | |
553 | } | |
554 | ||
555 | static void pim_bsm_update(struct pim_instance *pim, struct in_addr bsr, | |
556 | uint32_t bsr_prio) | |
557 | { | |
5acde1cf | 558 | if (bsr.s_addr != pim->global_scope.current_bsr.s_addr) { |
4efdb9c6 DL |
559 | if (pim->global_scope.current_bsr.s_addr) |
560 | pim_nht_bsr_del(pim, pim->global_scope.current_bsr); | |
561 | pim_nht_bsr_add(pim, bsr); | |
5acde1cf | 562 | |
5acde1cf | 563 | pim->global_scope.current_bsr = bsr; |
564 | pim->global_scope.current_bsr_first_ts = | |
565 | pim_time_monotonic_sec(); | |
566 | pim->global_scope.state = ACCEPT_PREFERRED; | |
567 | } | |
568 | pim->global_scope.current_bsr_prio = bsr_prio; | |
569 | pim->global_scope.current_bsr_last_ts = pim_time_monotonic_sec(); | |
570 | } | |
571 | ||
79d97386 | 572 | static bool pim_bsm_send_intf(uint8_t *buf, int len, struct interface *ifp, |
573 | struct in_addr dst_addr) | |
574 | { | |
575 | struct pim_interface *pim_ifp; | |
576 | ||
577 | pim_ifp = ifp->info; | |
578 | ||
579 | if (!pim_ifp) { | |
580 | if (PIM_DEBUG_BSM) | |
581 | zlog_debug("%s: Pim interface not available for %s", | |
15569c58 | 582 | __func__, ifp->name); |
79d97386 | 583 | return false; |
584 | } | |
585 | ||
586 | if (pim_ifp->pim_sock_fd == -1) { | |
587 | if (PIM_DEBUG_BSM) | |
588 | zlog_debug("%s: Pim sock not available for %s", | |
15569c58 | 589 | __func__, ifp->name); |
79d97386 | 590 | return false; |
591 | } | |
592 | ||
3bb29c4e DS |
593 | if (pim_msg_send(pim_ifp->pim_sock_fd, pim_ifp->primary_address, |
594 | dst_addr, buf, len, ifp->name)) { | |
595 | zlog_warn("%s: Could not send BSM message on interface: %s", | |
15569c58 | 596 | __func__, ifp->name); |
3bb29c4e DS |
597 | return false; |
598 | } | |
599 | ||
79d97386 | 600 | pim_ifp->pim_ifstat_bsm_tx++; |
601 | pim_ifp->pim->bsm_sent++; | |
602 | return true; | |
603 | } | |
604 | ||
40270c35 | 605 | static bool pim_bsm_frag_send(uint8_t *buf, uint32_t len, struct interface *ifp, |
606 | uint32_t pim_mtu, struct in_addr dst_addr, | |
607 | bool no_fwd) | |
608 | { | |
609 | struct bsmmsg_grpinfo *grpinfo, *curgrp; | |
610 | uint8_t *firstgrp_ptr; | |
611 | uint8_t *pkt; | |
612 | uint8_t *pak_start; | |
613 | uint32_t parsed_len = 0; | |
614 | uint32_t this_pkt_rem; | |
615 | uint32_t copy_byte_count; | |
616 | uint32_t this_pkt_len; | |
617 | uint8_t total_rp_cnt; | |
618 | uint8_t this_rp_cnt; | |
619 | uint8_t frag_rp_cnt; | |
620 | uint8_t rp_fit_cnt; | |
621 | bool pak_pending = false; | |
622 | ||
623 | /* MTU passed here is PIM MTU (IP MTU less IP Hdr) */ | |
624 | if (pim_mtu < (PIM_MIN_BSM_LEN)) { | |
625 | zlog_warn( | |
f79f7a7b | 626 | "%s: mtu(pim mtu: %d) size less than minimum bootstrap len", |
15569c58 | 627 | __func__, pim_mtu); |
40270c35 | 628 | if (PIM_DEBUG_BSM) |
629 | zlog_debug( | |
f79f7a7b | 630 | "%s: mtu (pim mtu:%d) less than minimum bootstrap len", |
15569c58 | 631 | __func__, pim_mtu); |
40270c35 | 632 | return false; |
633 | } | |
634 | ||
635 | pak_start = XCALLOC(MTYPE_PIM_BSM_PKT_VAR_MEM, pim_mtu); | |
636 | ||
40270c35 | 637 | pkt = pak_start; |
638 | ||
639 | /* Fill PIM header later before sending packet to calc checksum */ | |
640 | pkt += PIM_MSG_HEADER_LEN; | |
641 | buf += PIM_MSG_HEADER_LEN; | |
642 | ||
643 | /* copy bsm header to new packet at offset of pim hdr */ | |
644 | memcpy(pkt, buf, PIM_BSM_HDR_LEN); | |
645 | pkt += PIM_BSM_HDR_LEN; | |
646 | buf += PIM_BSM_HDR_LEN; | |
647 | parsed_len += (PIM_MSG_HEADER_LEN + PIM_BSM_HDR_LEN); | |
648 | ||
649 | /* Store the position of first grp ptr, which can be reused for | |
650 | * next packet to start filling group. old bsm header and pim hdr | |
651 | * remains. So need not be filled again for next packet onwards. | |
652 | */ | |
653 | firstgrp_ptr = pkt; | |
654 | ||
655 | /* we received mtu excluding IP hdr len as param | |
656 | * now this_pkt_rem is mtu excluding | |
657 | * PIM_BSM_HDR_LEN + PIM_MSG_HEADER_LEN | |
658 | */ | |
659 | this_pkt_rem = pim_mtu - (PIM_BSM_HDR_LEN + PIM_MSG_HEADER_LEN); | |
660 | ||
661 | /* For each group till the packet length parsed */ | |
662 | while (parsed_len < len) { | |
663 | /* pkt ---> fragment's current pointer | |
664 | * buf ---> input buffer's current pointer | |
665 | * mtu ---> size of the pim packet - PIM header | |
666 | * curgrp ---> current group on the fragment | |
667 | * grpinfo ---> current group on the input buffer | |
668 | * this_pkt_rem ---> bytes remaing on the current fragment | |
669 | * rp_fit_cnt ---> num of rp for current grp that | |
670 | * fits this frag | |
671 | * total_rp_cnt ---> total rp present for the group in the buf | |
672 | * frag_rp_cnt ---> no of rp for the group to be fit in | |
673 | * the frag | |
674 | * this_rp_cnt ---> how many rp have we parsed | |
675 | */ | |
676 | grpinfo = (struct bsmmsg_grpinfo *)buf; | |
677 | memcpy(pkt, buf, PIM_BSM_GRP_LEN); | |
678 | curgrp = (struct bsmmsg_grpinfo *)pkt; | |
679 | parsed_len += PIM_BSM_GRP_LEN; | |
680 | pkt += PIM_BSM_GRP_LEN; | |
681 | buf += PIM_BSM_GRP_LEN; | |
682 | this_pkt_rem -= PIM_BSM_GRP_LEN; | |
683 | ||
684 | /* initialize rp count and total_rp_cnt before the rp loop */ | |
685 | this_rp_cnt = 0; | |
686 | total_rp_cnt = grpinfo->frag_rp_count; | |
687 | ||
688 | /* Loop till all RPs for the group parsed */ | |
689 | while (this_rp_cnt < total_rp_cnt) { | |
690 | /* All RP from a group processed here. | |
691 | * group is pointed by grpinfo. | |
692 | * At this point make sure buf pointing to a RP | |
693 | * within a group | |
694 | */ | |
695 | rp_fit_cnt = this_pkt_rem / PIM_BSM_RP_LEN; | |
696 | ||
697 | /* calculate how many rp am i going to copy in | |
698 | * this frag | |
699 | */ | |
700 | if (rp_fit_cnt > (total_rp_cnt - this_rp_cnt)) | |
701 | frag_rp_cnt = total_rp_cnt - this_rp_cnt; | |
702 | else | |
703 | frag_rp_cnt = rp_fit_cnt; | |
704 | ||
705 | /* populate the frag rp count for the current grp */ | |
706 | curgrp->frag_rp_count = frag_rp_cnt; | |
707 | copy_byte_count = frag_rp_cnt * PIM_BSM_RP_LEN; | |
708 | ||
709 | /* copy all the rp that we are fitting in this | |
710 | * frag for the grp | |
711 | */ | |
712 | memcpy(pkt, buf, copy_byte_count); | |
713 | this_rp_cnt += frag_rp_cnt; | |
714 | buf += copy_byte_count; | |
715 | pkt += copy_byte_count; | |
716 | parsed_len += copy_byte_count; | |
717 | this_pkt_rem -= copy_byte_count; | |
718 | ||
719 | /* Either we couldn't fit all rp for the group or the | |
720 | * mtu reached | |
721 | */ | |
722 | if ((this_rp_cnt < total_rp_cnt) | |
723 | || (this_pkt_rem | |
724 | < (PIM_BSM_GRP_LEN + PIM_BSM_RP_LEN))) { | |
725 | /* No space to fit in more rp, send this pkt */ | |
726 | this_pkt_len = pim_mtu - this_pkt_rem; | |
727 | pim_msg_build_header(pak_start, this_pkt_len, | |
728 | PIM_MSG_TYPE_BOOTSTRAP, | |
729 | no_fwd); | |
730 | pim_bsm_send_intf(pak_start, this_pkt_len, ifp, | |
731 | dst_addr); | |
732 | ||
733 | /* Construct next fragment. Reuse old packet */ | |
734 | pkt = firstgrp_ptr; | |
735 | this_pkt_rem = pim_mtu - (PIM_BSM_HDR_LEN | |
736 | + PIM_MSG_HEADER_LEN); | |
737 | ||
738 | /* If pkt can't accomodate next group + atleast | |
739 | * one rp, we must break out of this inner loop | |
740 | * and process next RP | |
741 | */ | |
742 | if (total_rp_cnt == this_rp_cnt) | |
743 | break; | |
744 | ||
745 | /* If some more RPs for the same group pending, | |
746 | * fill grp hdr | |
747 | */ | |
748 | memcpy(pkt, (uint8_t *)grpinfo, | |
749 | PIM_BSM_GRP_LEN); | |
750 | curgrp = (struct bsmmsg_grpinfo *)pkt; | |
751 | pkt += PIM_BSM_GRP_LEN; | |
752 | this_pkt_rem -= PIM_BSM_GRP_LEN; | |
753 | pak_pending = false; | |
754 | } else { | |
755 | /* We filled something but not yet sent out */ | |
756 | pak_pending = true; | |
757 | } | |
758 | } /* while RP count */ | |
759 | } /*while parsed len */ | |
760 | ||
761 | /* Send if we have any unsent packet */ | |
762 | if (pak_pending) { | |
763 | this_pkt_len = pim_mtu - this_pkt_rem; | |
764 | pim_msg_build_header(pak_start, this_pkt_len, | |
765 | PIM_MSG_TYPE_BOOTSTRAP, no_fwd); | |
766 | pim_bsm_send_intf(pak_start, (pim_mtu - this_pkt_rem), ifp, | |
767 | dst_addr); | |
768 | } | |
769 | XFREE(MTYPE_PIM_BSM_PKT_VAR_MEM, pak_start); | |
770 | return true; | |
771 | } | |
772 | ||
79d97386 | 773 | static void pim_bsm_fwd_whole_sz(struct pim_instance *pim, uint8_t *buf, |
774 | uint32_t len, int sz) | |
775 | { | |
776 | struct interface *ifp; | |
777 | struct pim_interface *pim_ifp; | |
778 | struct in_addr dst_addr; | |
779 | uint32_t pim_mtu; | |
2951a7a4 QY |
780 | bool no_fwd = false; |
781 | bool ret = false; | |
79d97386 | 782 | |
783 | /* For now only global scope zone is supported, so send on all | |
784 | * pim interfaces in the vrf | |
785 | */ | |
786 | dst_addr = qpim_all_pim_routers_addr; | |
787 | FOR_ALL_INTERFACES (pim->vrf, ifp) { | |
788 | pim_ifp = ifp->info; | |
789 | if ((!pim_ifp) || (!pim_ifp->bsm_enable)) | |
790 | continue; | |
9255f21e | 791 | |
792 | /* | |
793 | * RFC 5059 Sec 3.4: | |
794 | * When a Bootstrap message is forwarded, it is forwarded out | |
795 | * of every multicast-capable interface that has PIM neighbors. | |
796 | * | |
797 | * So skipping pim interfaces with no neighbors. | |
798 | */ | |
799 | if (listcount(pim_ifp->pim_neighbor_list) == 0) | |
800 | continue; | |
801 | ||
79d97386 | 802 | pim_hello_require(ifp); |
803 | pim_mtu = ifp->mtu - MAX_IP_HDR_LEN; | |
804 | if (pim_mtu < len) { | |
40270c35 | 805 | ret = pim_bsm_frag_send(buf, len, ifp, pim_mtu, |
806 | dst_addr, no_fwd); | |
807 | if (PIM_DEBUG_BSM) | |
808 | zlog_debug("%s: pim_bsm_frag_send returned %s", | |
15569c58 | 809 | __func__, ret ? "TRUE" : "FALSE"); |
79d97386 | 810 | } else { |
811 | pim_msg_build_header(buf, len, PIM_MSG_TYPE_BOOTSTRAP, | |
812 | no_fwd); | |
813 | if (!pim_bsm_send_intf(buf, len, ifp, dst_addr)) { | |
814 | if (PIM_DEBUG_BSM) | |
815 | zlog_debug( | |
2951a7a4 | 816 | "%s: pim_bsm_send_intf returned false", |
15569c58 | 817 | __func__); |
79d97386 | 818 | } |
819 | } | |
820 | } | |
821 | } | |
822 | ||
6bb2ef35 | 823 | bool pim_bsm_new_nbr_fwd(struct pim_neighbor *neigh, struct interface *ifp) |
824 | { | |
825 | struct in_addr dst_addr; | |
826 | struct pim_interface *pim_ifp; | |
827 | struct bsm_scope *scope; | |
d4a4525c | 828 | struct bsm_frag *bsfrag; |
6bb2ef35 | 829 | char neigh_src_str[INET_ADDRSTRLEN]; |
830 | uint32_t pim_mtu; | |
831 | bool no_fwd = true; | |
832 | bool ret = false; | |
833 | ||
834 | if (PIM_DEBUG_BSM) { | |
835 | pim_inet4_dump("<src?>", neigh->source_addr, neigh_src_str, | |
836 | sizeof(neigh_src_str)); | |
5e81f5dd DS |
837 | zlog_debug("%s: New neighbor %s seen on %s", __func__, |
838 | neigh_src_str, ifp->name); | |
6bb2ef35 | 839 | } |
840 | ||
841 | pim_ifp = ifp->info; | |
842 | ||
843 | /* DR only forwards BSM packet */ | |
844 | if (pim_ifp->pim_dr_addr.s_addr == pim_ifp->primary_address.s_addr) { | |
845 | if (PIM_DEBUG_BSM) | |
846 | zlog_debug( | |
847 | "%s: It is not DR, so don't forward BSM packet", | |
5e81f5dd | 848 | __func__); |
6bb2ef35 | 849 | } |
850 | ||
851 | if (!pim_ifp->bsm_enable) { | |
852 | if (PIM_DEBUG_BSM) | |
5e81f5dd DS |
853 | zlog_debug("%s: BSM proc not enabled on %s", __func__, |
854 | ifp->name); | |
6bb2ef35 | 855 | return ret; |
856 | } | |
857 | ||
858 | scope = &pim_ifp->pim->global_scope; | |
859 | ||
d4a4525c | 860 | if (!bsm_frags_count(scope->bsm_frags)) { |
6bb2ef35 | 861 | if (PIM_DEBUG_BSM) |
862 | zlog_debug("%s: BSM list for the scope is empty", | |
5e81f5dd | 863 | __func__); |
6bb2ef35 | 864 | return ret; |
865 | } | |
866 | ||
867 | if (!pim_ifp->ucast_bsm_accept) { | |
868 | dst_addr = qpim_all_pim_routers_addr; | |
869 | if (PIM_DEBUG_BSM) | |
5e81f5dd DS |
870 | zlog_debug("%s: Sending BSM mcast to %s", __func__, |
871 | neigh_src_str); | |
6bb2ef35 | 872 | } else { |
873 | dst_addr = neigh->source_addr; | |
874 | if (PIM_DEBUG_BSM) | |
5e81f5dd DS |
875 | zlog_debug("%s: Sending BSM ucast to %s", __func__, |
876 | neigh_src_str); | |
6bb2ef35 | 877 | } |
878 | pim_mtu = ifp->mtu - MAX_IP_HDR_LEN; | |
879 | pim_hello_require(ifp); | |
880 | ||
d4a4525c DL |
881 | frr_each (bsm_frags, scope->bsm_frags, bsfrag) { |
882 | if (pim_mtu < bsfrag->size) { | |
883 | ret = pim_bsm_frag_send(bsfrag->data, bsfrag->size, ifp, | |
884 | pim_mtu, dst_addr, no_fwd); | |
6bb2ef35 | 885 | if (!ret) { |
886 | if (PIM_DEBUG_BSM) | |
887 | zlog_debug( | |
888 | "%s: pim_bsm_frag_send failed", | |
5e81f5dd | 889 | __func__); |
6bb2ef35 | 890 | } |
891 | } else { | |
892 | /* Pim header needs to be constructed */ | |
d4a4525c | 893 | pim_msg_build_header(bsfrag->data, bsfrag->size, |
6bb2ef35 | 894 | PIM_MSG_TYPE_BOOTSTRAP, no_fwd); |
d4a4525c DL |
895 | ret = pim_bsm_send_intf(bsfrag->data, bsfrag->size, ifp, |
896 | dst_addr); | |
6bb2ef35 | 897 | if (!ret) { |
898 | if (PIM_DEBUG_BSM) | |
899 | zlog_debug( | |
900 | "%s: pim_bsm_frag_send failed", | |
5e81f5dd | 901 | __func__); |
6bb2ef35 | 902 | } |
903 | } | |
904 | } | |
905 | return ret; | |
906 | } | |
907 | ||
d0e418b4 | 908 | struct bsgrp_node *pim_bsm_get_bsgrp_node(struct bsm_scope *scope, |
909 | struct prefix *grp) | |
910 | { | |
911 | struct route_node *rn; | |
912 | struct bsgrp_node *bsgrp; | |
913 | ||
914 | rn = route_node_lookup(scope->bsrp_table, grp); | |
915 | if (!rn) { | |
916 | if (PIM_DEBUG_BSM) | |
917 | zlog_debug("%s: Route node doesn't exist for the group", | |
15569c58 | 918 | __func__); |
d0e418b4 | 919 | return NULL; |
920 | } | |
921 | bsgrp = rn->info; | |
922 | route_unlock_node(rn); | |
923 | ||
924 | return bsgrp; | |
925 | } | |
5acde1cf | 926 | |
7b3e6ba1 | 927 | static uint32_t hash_calc_on_grp_rp(struct prefix group, struct in_addr rp, |
928 | uint8_t hashmasklen) | |
929 | { | |
930 | uint64_t temp; | |
931 | uint32_t hash; | |
932 | uint32_t grpaddr; | |
933 | uint32_t rp_add; | |
934 | uint32_t mask = 0xffffffff; | |
935 | ||
936 | /* mask to be made zero if hashmasklen is 0 because mask << 32 | |
937 | * may not give 0. hashmasklen can be 0 to 32. | |
938 | */ | |
939 | if (hashmasklen == 0) | |
940 | mask = 0; | |
941 | ||
942 | /* in_addr stores ip in big endian, hence network byte order | |
943 | * convert to uint32 before processing hash | |
944 | */ | |
945 | grpaddr = ntohl(group.u.prefix4.s_addr); | |
946 | /* Avoid shifting by 32 bit on a 32 bit register */ | |
947 | if (hashmasklen) | |
948 | grpaddr = grpaddr & ((mask << (32 - hashmasklen))); | |
949 | else | |
950 | grpaddr = grpaddr & mask; | |
951 | rp_add = ntohl(rp.s_addr); | |
29f7fc87 DS |
952 | temp = 1103515245 * ((1103515245 * (uint64_t)grpaddr + 12345) ^ rp_add) |
953 | + 12345; | |
7b3e6ba1 | 954 | hash = temp & (0x7fffffff); |
955 | return hash; | |
956 | } | |
957 | ||
958 | static bool pim_install_bsm_grp_rp(struct pim_instance *pim, | |
959 | struct bsgrp_node *grpnode, | |
960 | struct bsmmsg_rpinfo *rp) | |
961 | { | |
962 | struct bsm_rpinfo *bsm_rpinfo; | |
963 | uint8_t hashMask_len = pim->global_scope.hashMasklen; | |
964 | ||
965 | /*memory allocation for bsm_rpinfo */ | |
fdab2940 | 966 | bsm_rpinfo = XCALLOC(MTYPE_PIM_BSRP_INFO, sizeof(*bsm_rpinfo)); |
7b3e6ba1 | 967 | |
7b3e6ba1 | 968 | bsm_rpinfo->rp_prio = rp->rp_pri; |
969 | bsm_rpinfo->rp_holdtime = rp->rp_holdtime; | |
970 | memcpy(&bsm_rpinfo->rp_address, &rp->rpaddr.addr, | |
971 | sizeof(struct in_addr)); | |
972 | bsm_rpinfo->elapse_time = 0; | |
973 | ||
974 | /* Back pointer to the group node. */ | |
975 | bsm_rpinfo->bsgrp_node = grpnode; | |
976 | ||
977 | /* update hash for this rp node */ | |
978 | bsm_rpinfo->hash = hash_calc_on_grp_rp(grpnode->group, rp->rpaddr.addr, | |
979 | hashMask_len); | |
fdab2940 | 980 | if (bsm_rpinfos_add(grpnode->partial_bsrp_list, bsm_rpinfo) == NULL) { |
7b3e6ba1 | 981 | if (PIM_DEBUG_BSM) |
982 | zlog_debug( | |
63efca0e | 983 | "%s, bs_rpinfo node added to the partial bs_rplist.", |
15569c58 | 984 | __func__); |
7b3e6ba1 | 985 | return true; |
986 | } | |
987 | ||
988 | if (PIM_DEBUG_BSM) | |
63efca0e | 989 | zlog_debug("%s: list node not added", __func__); |
7b3e6ba1 | 990 | |
fdab2940 | 991 | XFREE(MTYPE_PIM_BSRP_INFO, bsm_rpinfo); |
7b3e6ba1 | 992 | return false; |
993 | } | |
994 | ||
995 | static void pim_update_pending_rp_cnt(struct bsm_scope *sz, | |
996 | struct bsgrp_node *bsgrp, | |
997 | uint16_t bsm_frag_tag, | |
998 | uint32_t total_rp_count) | |
999 | { | |
1000 | if (bsgrp->pend_rp_cnt) { | |
1001 | /* received bsm is different packet , | |
1002 | * it is not same fragment. | |
1003 | */ | |
1004 | if (bsm_frag_tag != bsgrp->frag_tag) { | |
1005 | if (PIM_DEBUG_BSM) | |
1006 | zlog_debug( | |
63efca0e | 1007 | "%s,Received a new BSM ,so clear the pending bs_rpinfo list.", |
15569c58 | 1008 | __func__); |
fdab2940 | 1009 | pim_bsm_rpinfos_free(bsgrp->partial_bsrp_list); |
7b3e6ba1 | 1010 | bsgrp->pend_rp_cnt = total_rp_count; |
1011 | } | |
1012 | } else | |
1013 | bsgrp->pend_rp_cnt = total_rp_count; | |
1014 | ||
1015 | bsgrp->frag_tag = bsm_frag_tag; | |
1016 | } | |
1017 | ||
1018 | /* Parsing BSR packet and adding to partial list of corresponding bsgrp node */ | |
1019 | static bool pim_bsm_parse_install_g2rp(struct bsm_scope *scope, uint8_t *buf, | |
1020 | int buflen, uint16_t bsm_frag_tag) | |
1021 | { | |
1022 | struct bsmmsg_grpinfo grpinfo; | |
1023 | struct bsmmsg_rpinfo rpinfo; | |
1024 | struct prefix group; | |
1025 | struct bsgrp_node *bsgrp = NULL; | |
1026 | int frag_rp_cnt = 0; | |
1027 | int offset = 0; | |
1028 | int ins_count = 0; | |
1029 | ||
1030 | while (buflen > offset) { | |
b1945363 DS |
1031 | if (offset + (int)sizeof(struct bsmmsg_grpinfo) > buflen) { |
1032 | if (PIM_DEBUG_BSM) | |
1033 | zlog_debug( | |
1034 | "%s: buflen received %d is less than the internal data structure of the packet would suggest", | |
15569c58 | 1035 | __func__, buflen); |
b1945363 DS |
1036 | return false; |
1037 | } | |
7b3e6ba1 | 1038 | /* Extract Group tlv from BSM */ |
1039 | memcpy(&grpinfo, buf, sizeof(struct bsmmsg_grpinfo)); | |
1040 | ||
1041 | if (PIM_DEBUG_BSM) { | |
1042 | char grp_str[INET_ADDRSTRLEN]; | |
1043 | ||
1044 | pim_inet4_dump("<Group?>", grpinfo.group.addr, grp_str, | |
1045 | sizeof(grp_str)); | |
1046 | zlog_debug( | |
63efca0e | 1047 | "%s, Group %s Rpcount:%d Fragment-Rp-count:%d", |
15569c58 | 1048 | __func__, grp_str, grpinfo.rp_count, |
7b3e6ba1 | 1049 | grpinfo.frag_rp_count); |
1050 | } | |
1051 | ||
1052 | buf += sizeof(struct bsmmsg_grpinfo); | |
1053 | offset += sizeof(struct bsmmsg_grpinfo); | |
1054 | ||
1055 | if (grpinfo.rp_count == 0) { | |
1056 | if (PIM_DEBUG_BSM) { | |
1057 | char grp_str[INET_ADDRSTRLEN]; | |
1058 | ||
1059 | pim_inet4_dump("<Group?>", grpinfo.group.addr, | |
1060 | grp_str, sizeof(grp_str)); | |
63efca0e DL |
1061 | zlog_debug("%s, Rp count is zero for group: %s", |
1062 | __func__, grp_str); | |
7b3e6ba1 | 1063 | } |
1064 | return false; | |
1065 | } | |
1066 | ||
1067 | group.family = AF_INET; | |
b1945363 DS |
1068 | if (grpinfo.group.mask > IPV4_MAX_BITLEN) { |
1069 | if (PIM_DEBUG_BSM) | |
15569c58 DA |
1070 | zlog_debug( |
1071 | "%s, v4 prefix length specified: %d is too long", | |
1072 | __func__, grpinfo.group.mask); | |
b1945363 DS |
1073 | return false; |
1074 | } | |
7b3e6ba1 | 1075 | group.prefixlen = grpinfo.group.mask; |
1076 | group.u.prefix4.s_addr = grpinfo.group.addr.s_addr; | |
1077 | ||
1078 | /* Get the Group node for the BSM rp table */ | |
1079 | bsgrp = pim_bsm_get_bsgrp_node(scope, &group); | |
1080 | ||
1081 | if (!bsgrp) { | |
1082 | if (PIM_DEBUG_BSM) | |
63efca0e DL |
1083 | zlog_debug("%s, Create new BSM Group node.", |
1084 | __func__); | |
7b3e6ba1 | 1085 | |
1086 | /* create a new node to be added to the tree. */ | |
1087 | bsgrp = pim_bsm_new_bsgrp_node(scope->bsrp_table, | |
1088 | &group); | |
1089 | ||
1090 | if (!bsgrp) { | |
1091 | zlog_debug( | |
63efca0e | 1092 | "%s, Failed to get the BSM group node.", |
15569c58 | 1093 | __func__); |
7b3e6ba1 | 1094 | continue; |
1095 | } | |
1096 | ||
1097 | bsgrp->scope = scope; | |
1098 | } | |
1099 | ||
1100 | pim_update_pending_rp_cnt(scope, bsgrp, bsm_frag_tag, | |
1101 | grpinfo.rp_count); | |
1102 | frag_rp_cnt = grpinfo.frag_rp_count; | |
1103 | ins_count = 0; | |
1104 | ||
1105 | while (frag_rp_cnt--) { | |
b1945363 DS |
1106 | if (offset + (int)sizeof(struct bsmmsg_rpinfo) |
1107 | > buflen) { | |
1108 | if (PIM_DEBUG_BSM) | |
1109 | zlog_debug( | |
1110 | "%s, buflen received: %u is less than the internal data structure of the packet would suggest", | |
15569c58 | 1111 | __func__, buflen); |
b1945363 DS |
1112 | return false; |
1113 | } | |
1114 | ||
7b3e6ba1 | 1115 | /* Extract RP address tlv from BSM */ |
1116 | memcpy(&rpinfo, buf, sizeof(struct bsmmsg_rpinfo)); | |
1117 | rpinfo.rp_holdtime = ntohs(rpinfo.rp_holdtime); | |
1118 | buf += sizeof(struct bsmmsg_rpinfo); | |
1119 | offset += sizeof(struct bsmmsg_rpinfo); | |
1120 | ||
1121 | if (PIM_DEBUG_BSM) { | |
1122 | char rp_str[INET_ADDRSTRLEN]; | |
1123 | ||
1124 | pim_inet4_dump("<Rpaddr?>", rpinfo.rpaddr.addr, | |
1125 | rp_str, sizeof(rp_str)); | |
1126 | zlog_debug( | |
63efca0e | 1127 | "%s, Rp address - %s; pri:%d hold:%d", |
15569c58 DA |
1128 | __func__, rp_str, rpinfo.rp_pri, |
1129 | rpinfo.rp_holdtime); | |
7b3e6ba1 | 1130 | } |
1131 | ||
1132 | /* Call Install api to update grp-rp mappings */ | |
1133 | if (pim_install_bsm_grp_rp(scope->pim, bsgrp, &rpinfo)) | |
1134 | ins_count++; | |
1135 | } | |
1136 | ||
1137 | bsgrp->pend_rp_cnt -= ins_count; | |
1138 | ||
1139 | if (!bsgrp->pend_rp_cnt) { | |
1140 | if (PIM_DEBUG_BSM) | |
1141 | zlog_debug( | |
1142 | "%s, Recvd all the rps for this group, so bsrp list with penidng rp list.", | |
15569c58 | 1143 | __func__); |
20fd30e5 | 1144 | /* replace the bsrp_list with pending list */ |
1145 | pim_instate_pend_list(bsgrp); | |
7b3e6ba1 | 1146 | } |
1147 | } | |
1148 | return true; | |
1149 | } | |
1150 | ||
5acde1cf | 1151 | int pim_bsm_process(struct interface *ifp, struct ip *ip_hdr, uint8_t *buf, |
1152 | uint32_t buf_size, bool no_fwd) | |
1153 | { | |
1154 | struct bsm_hdr *bshdr; | |
79d97386 | 1155 | int sz = PIM_GBL_SZ_ID; |
5acde1cf | 1156 | struct bsmmsg_grpinfo *msg_grp; |
1157 | struct pim_interface *pim_ifp = NULL; | |
d4a4525c | 1158 | struct bsm_frag *bsfrag; |
5acde1cf | 1159 | struct pim_instance *pim; |
1160 | char bsr_str[INET_ADDRSTRLEN]; | |
1161 | uint16_t frag_tag; | |
2951a7a4 | 1162 | bool empty_bsm = false; |
5acde1cf | 1163 | |
1164 | /* BSM Packet acceptance validation */ | |
1165 | pim_ifp = ifp->info; | |
1166 | if (!pim_ifp) { | |
1167 | if (PIM_DEBUG_BSM) | |
1168 | zlog_debug("%s: multicast not enabled on interface %s", | |
15569c58 | 1169 | __func__, ifp->name); |
5acde1cf | 1170 | return -1; |
1171 | } | |
1172 | ||
1173 | pim_ifp->pim_ifstat_bsm_rx++; | |
1174 | pim = pim_ifp->pim; | |
1175 | pim->bsm_rcvd++; | |
1176 | ||
1177 | /* Drop if bsm processing is disabled on interface */ | |
1178 | if (!pim_ifp->bsm_enable) { | |
15569c58 DA |
1179 | zlog_warn("%s: BSM not enabled on interface %s", __func__, |
1180 | ifp->name); | |
5acde1cf | 1181 | pim_ifp->pim_ifstat_bsm_cfg_miss++; |
1182 | pim->bsm_dropped++; | |
1183 | return -1; | |
1184 | } | |
1185 | ||
d83a854b | 1186 | if (buf_size < (PIM_MSG_HEADER_LEN + sizeof(struct bsm_hdr))) { |
b1945363 | 1187 | if (PIM_DEBUG_BSM) |
15569c58 DA |
1188 | zlog_debug( |
1189 | "%s: received buffer length of %d which is too small to properly decode", | |
1190 | __func__, buf_size); | |
b1945363 DS |
1191 | return -1; |
1192 | } | |
1193 | ||
5acde1cf | 1194 | bshdr = (struct bsm_hdr *)(buf + PIM_MSG_HEADER_LEN); |
1195 | pim_inet4_dump("<bsr?>", bshdr->bsr_addr.addr, bsr_str, | |
1196 | sizeof(bsr_str)); | |
12256b84 | 1197 | if (bshdr->hm_len > IPV4_MAX_BITLEN) { |
6cde4b45 | 1198 | zlog_warn("Bad hashmask length for IPv4; got %hhu, expected value in range 0-32", |
817f8933 QY |
1199 | bshdr->hm_len); |
1200 | pim->bsm_dropped++; | |
1201 | return -1; | |
1202 | } | |
5acde1cf | 1203 | pim->global_scope.hashMasklen = bshdr->hm_len; |
1204 | frag_tag = ntohs(bshdr->frag_tag); | |
1205 | ||
1206 | /* Identify empty BSM */ | |
1207 | if ((buf_size - PIM_BSM_HDR_LEN - PIM_MSG_HEADER_LEN) < PIM_BSM_GRP_LEN) | |
1208 | empty_bsm = true; | |
1209 | ||
1210 | if (!empty_bsm) { | |
1211 | msg_grp = (struct bsmmsg_grpinfo *)(buf + PIM_MSG_HEADER_LEN | |
1212 | + PIM_BSM_HDR_LEN); | |
1213 | /* Currently we don't support scope zoned BSM */ | |
1214 | if (msg_grp->group.sz) { | |
1215 | if (PIM_DEBUG_BSM) | |
1216 | zlog_debug( | |
1217 | "%s : Administratively scoped range BSM received", | |
15569c58 | 1218 | __func__); |
5acde1cf | 1219 | pim_ifp->pim_ifstat_bsm_invalid_sz++; |
1220 | pim->bsm_dropped++; | |
1221 | return -1; | |
1222 | } | |
1223 | } | |
1224 | ||
1225 | /* Drop if bsr is not preferred bsr */ | |
1226 | if (!is_preferred_bsr(pim, bshdr->bsr_addr.addr, bshdr->bsr_prio)) { | |
1227 | if (PIM_DEBUG_BSM) | |
1228 | zlog_debug("%s : Received a non-preferred BSM", | |
15569c58 | 1229 | __func__); |
5acde1cf | 1230 | pim->bsm_dropped++; |
1231 | return -1; | |
1232 | } | |
1233 | ||
1234 | if (no_fwd) { | |
1235 | /* only accept no-forward BSM if quick refresh on startup */ | |
1236 | if ((pim->global_scope.accept_nofwd_bsm) | |
1237 | || (frag_tag == pim->global_scope.bsm_frag_tag)) { | |
1238 | pim->global_scope.accept_nofwd_bsm = false; | |
1239 | } else { | |
1240 | if (PIM_DEBUG_BSM) | |
1241 | zlog_debug( | |
1242 | "%s : nofwd_bsm received on %s when accpt_nofwd_bsm false", | |
15569c58 | 1243 | __func__, bsr_str); |
5acde1cf | 1244 | pim->bsm_dropped++; |
1245 | pim_ifp->pim_ifstat_ucast_bsm_cfg_miss++; | |
1246 | return -1; | |
1247 | } | |
1248 | } | |
1249 | ||
5acde1cf | 1250 | if (ip_hdr->ip_dst.s_addr == qpim_all_pim_routers_addr.s_addr) { |
4efdb9c6 DL |
1251 | /* Multicast BSMs are only accepted if source interface & IP |
1252 | * match RPF towards the BSR's IP address, or they have | |
1253 | * no-forward set | |
1254 | */ | |
1255 | if (!no_fwd | |
1256 | && !pim_nht_bsr_rpf_check(pim, bshdr->bsr_addr.addr, ifp, | |
1257 | ip_hdr->ip_src)) { | |
1258 | if (PIM_DEBUG_BSM) | |
1259 | zlog_debug( | |
1260 | "BSM check: RPF to BSR %s is not %pI4%%%s", | |
1261 | bsr_str, &ip_hdr->ip_src, ifp->name); | |
1262 | pim->bsm_dropped++; | |
1263 | return -1; | |
5acde1cf | 1264 | } |
1e9044be DL |
1265 | } else if (if_address_is_local(&ip_hdr->ip_dst, AF_INET, |
1266 | pim->vrf->vrf_id)) { | |
5acde1cf | 1267 | /* Unicast BSM received - if ucast bsm not enabled on |
1268 | * the interface, drop it | |
1269 | */ | |
1270 | if (!pim_ifp->ucast_bsm_accept) { | |
1271 | if (PIM_DEBUG_BSM) | |
1272 | zlog_debug( | |
1273 | "%s : Unicast BSM not enabled on interface %s", | |
15569c58 | 1274 | __func__, ifp->name); |
5acde1cf | 1275 | pim_ifp->pim_ifstat_ucast_bsm_cfg_miss++; |
1276 | pim->bsm_dropped++; | |
1277 | return -1; | |
1278 | } | |
1279 | ||
1280 | } else { | |
1281 | if (PIM_DEBUG_BSM) | |
1282 | zlog_debug("%s : Invalid destination address", | |
15569c58 | 1283 | __func__); |
5acde1cf | 1284 | pim->bsm_dropped++; |
1285 | return -1; | |
1286 | } | |
1287 | ||
1288 | if (empty_bsm) { | |
1289 | if (PIM_DEBUG_BSM) | |
15569c58 | 1290 | zlog_debug("%s : Empty Pref BSM received", __func__); |
5acde1cf | 1291 | } |
7b3e6ba1 | 1292 | /* Parse Update bsm rp table and install/uninstall rp if required */ |
1293 | if (!pim_bsm_parse_install_g2rp( | |
1294 | &pim_ifp->pim->global_scope, | |
1295 | (buf + PIM_BSM_HDR_LEN + PIM_MSG_HEADER_LEN), | |
1296 | (buf_size - PIM_BSM_HDR_LEN - PIM_MSG_HEADER_LEN), | |
1297 | frag_tag)) { | |
1298 | if (PIM_DEBUG_BSM) { | |
63efca0e | 1299 | zlog_debug("%s, Parsing BSM failed.", __func__); |
7b3e6ba1 | 1300 | } |
1301 | pim->bsm_dropped++; | |
1302 | return -1; | |
1303 | } | |
5acde1cf | 1304 | /* Restart the bootstrap timer */ |
1305 | pim_bs_timer_restart(&pim_ifp->pim->global_scope, | |
1306 | PIM_BSR_DEFAULT_TIMEOUT); | |
1307 | ||
1308 | /* If new BSM received, clear the old bsm database */ | |
1309 | if (pim_ifp->pim->global_scope.bsm_frag_tag != frag_tag) { | |
1310 | if (PIM_DEBUG_BSM) { | |
1311 | zlog_debug("%s: Current frag tag: %d Frag teg rcvd: %d", | |
15569c58 | 1312 | __func__, |
5acde1cf | 1313 | pim_ifp->pim->global_scope.bsm_frag_tag, |
1314 | frag_tag); | |
1315 | } | |
d4a4525c | 1316 | pim_bsm_frags_free(&pim_ifp->pim->global_scope); |
5acde1cf | 1317 | pim_ifp->pim->global_scope.bsm_frag_tag = frag_tag; |
1318 | } | |
1319 | ||
1320 | /* update the scope information from bsm */ | |
1321 | pim_bsm_update(pim, bshdr->bsr_addr.addr, bshdr->bsr_prio); | |
79d97386 | 1322 | |
1323 | if (!no_fwd) { | |
1324 | pim_bsm_fwd_whole_sz(pim_ifp->pim, buf, buf_size, sz); | |
d4a4525c DL |
1325 | bsfrag = XCALLOC(MTYPE_PIM_BSM_FRAG, |
1326 | sizeof(struct bsm_frag) + buf_size); | |
79d97386 | 1327 | |
d4a4525c DL |
1328 | bsfrag->size = buf_size; |
1329 | memcpy(bsfrag->data, buf, buf_size); | |
1330 | bsm_frags_add_tail(pim_ifp->pim->global_scope.bsm_frags, | |
1331 | bsfrag); | |
79d97386 | 1332 | } |
1333 | ||
5acde1cf | 1334 | return 0; |
1335 | } |