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1 | /* | |
2 | * PIM for Quagga | |
3 | * Copyright (C) 2008 Everton da Silva Marques | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; see the file COPYING; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | */ | |
19 | ||
20 | #include <zebra.h> | |
21 | #include "log.h" | |
22 | #include "memory.h" | |
23 | #include "if.h" | |
24 | #include "lib_errors.h" | |
25 | ||
26 | #include "pimd.h" | |
27 | #include "pim_iface.h" | |
28 | #include "pim_igmp.h" | |
29 | #include "pim_igmpv3.h" | |
30 | #include "pim_str.h" | |
31 | #include "pim_util.h" | |
32 | #include "pim_time.h" | |
33 | #include "pim_zebra.h" | |
34 | #include "pim_oil.h" | |
35 | ||
36 | static void group_retransmit_timer_on(struct igmp_group *group); | |
37 | static long igmp_group_timer_remain_msec(struct igmp_group *group); | |
38 | static long igmp_source_timer_remain_msec(struct igmp_source *source); | |
39 | static void group_query_send(struct igmp_group *group); | |
40 | static void source_query_send_by_flag(struct igmp_group *group, | |
41 | int num_sources_tosend); | |
42 | ||
43 | static void on_trace(const char *label, struct interface *ifp, | |
44 | struct in_addr from, struct in_addr group_addr, | |
45 | int num_sources, struct in_addr *sources) | |
46 | { | |
47 | if (PIM_DEBUG_IGMP_TRACE) { | |
48 | char from_str[INET_ADDRSTRLEN]; | |
49 | char group_str[INET_ADDRSTRLEN]; | |
50 | ||
51 | pim_inet4_dump("<from?>", from, from_str, sizeof(from_str)); | |
52 | pim_inet4_dump("<group?>", group_addr, group_str, | |
53 | sizeof(group_str)); | |
54 | ||
55 | zlog_debug("%s: from %s on %s: group=%s sources=%d", label, | |
56 | from_str, ifp->name, group_str, num_sources); | |
57 | } | |
58 | } | |
59 | ||
60 | void igmp_group_reset_gmi(struct igmp_group *group) | |
61 | { | |
62 | long group_membership_interval_msec; | |
63 | struct pim_interface *pim_ifp; | |
64 | struct igmp_sock *igmp; | |
65 | struct interface *ifp; | |
66 | ||
67 | igmp = group->group_igmp_sock; | |
68 | ifp = igmp->interface; | |
69 | pim_ifp = ifp->info; | |
70 | ||
71 | /* | |
72 | RFC 3376: 8.4. Group Membership Interval | |
73 | ||
74 | The Group Membership Interval is the amount of time that must pass | |
75 | before a multicast router decides there are no more members of a | |
76 | group or a particular source on a network. | |
77 | ||
78 | This value MUST be ((the Robustness Variable) times (the Query | |
79 | Interval)) plus (one Query Response Interval). | |
80 | ||
81 | group_membership_interval_msec = querier_robustness_variable * | |
82 | (1000 * querier_query_interval) + | |
83 | 100 * query_response_interval_dsec; | |
84 | */ | |
85 | group_membership_interval_msec = PIM_IGMP_GMI_MSEC( | |
86 | igmp->querier_robustness_variable, igmp->querier_query_interval, | |
87 | pim_ifp->igmp_query_max_response_time_dsec); | |
88 | ||
89 | if (PIM_DEBUG_IGMP_TRACE) { | |
90 | char group_str[INET_ADDRSTRLEN]; | |
91 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
92 | sizeof(group_str)); | |
93 | zlog_debug( | |
94 | "Resetting group %s timer to GMI=%ld.%03ld sec on %s", | |
95 | group_str, group_membership_interval_msec / 1000, | |
96 | group_membership_interval_msec % 1000, ifp->name); | |
97 | } | |
98 | ||
99 | /* | |
100 | RFC 3376: 6.2.2. Definition of Group Timers | |
101 | ||
102 | The group timer is only used when a group is in EXCLUDE mode and | |
103 | it represents the time for the *filter-mode* of the group to | |
104 | expire and switch to INCLUDE mode. | |
105 | */ | |
106 | zassert(group->group_filtermode_isexcl); | |
107 | ||
108 | igmp_group_timer_on(group, group_membership_interval_msec, ifp->name); | |
109 | } | |
110 | ||
111 | static int igmp_source_timer(struct thread *t) | |
112 | { | |
113 | struct igmp_source *source; | |
114 | struct igmp_group *group; | |
115 | ||
116 | source = THREAD_ARG(t); | |
117 | ||
118 | group = source->source_group; | |
119 | ||
120 | if (PIM_DEBUG_IGMP_TRACE) { | |
121 | char group_str[INET_ADDRSTRLEN]; | |
122 | char source_str[INET_ADDRSTRLEN]; | |
123 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
124 | sizeof(group_str)); | |
125 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
126 | sizeof(source_str)); | |
127 | zlog_debug( | |
128 | "%s: Source timer expired for group %s source %s on %s", | |
129 | __PRETTY_FUNCTION__, group_str, source_str, | |
130 | group->group_igmp_sock->interface->name); | |
131 | } | |
132 | ||
133 | /* | |
134 | RFC 3376: 6.3. IGMPv3 Source-Specific Forwarding Rules | |
135 | ||
136 | Group | |
137 | Filter-Mode Source Timer Value Action | |
138 | ----------- ------------------ ------ | |
139 | INCLUDE TIMER == 0 Suggest to stop forwarding | |
140 | traffic from source and | |
141 | remove source record. If | |
142 | there are no more source | |
143 | records for the group, delete | |
144 | group record. | |
145 | ||
146 | EXCLUDE TIMER == 0 Suggest to not forward | |
147 | traffic from source | |
148 | (DO NOT remove record) | |
149 | ||
150 | Source timer switched from (T > 0) to (T == 0): disable forwarding. | |
151 | */ | |
152 | ||
153 | if (group->group_filtermode_isexcl) { | |
154 | /* EXCLUDE mode */ | |
155 | ||
156 | igmp_source_forward_stop(source); | |
157 | } else { | |
158 | /* INCLUDE mode */ | |
159 | ||
160 | /* igmp_source_delete() will stop forwarding source */ | |
161 | igmp_source_delete(source); | |
162 | ||
163 | /* | |
164 | If there are no more source records for the group, delete | |
165 | group | |
166 | record. | |
167 | */ | |
168 | if (!listcount(group->group_source_list)) { | |
169 | igmp_group_delete_empty_include(group); | |
170 | } | |
171 | } | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | static void source_timer_off(struct igmp_group *group, | |
177 | struct igmp_source *source) | |
178 | { | |
179 | if (!source->t_source_timer) | |
180 | return; | |
181 | ||
182 | if (PIM_DEBUG_IGMP_TRACE) { | |
183 | char group_str[INET_ADDRSTRLEN]; | |
184 | char source_str[INET_ADDRSTRLEN]; | |
185 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
186 | sizeof(group_str)); | |
187 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
188 | sizeof(source_str)); | |
189 | zlog_debug( | |
190 | "Cancelling TIMER event for group %s source %s on %s", | |
191 | group_str, source_str, | |
192 | group->group_igmp_sock->interface->name); | |
193 | } | |
194 | ||
195 | THREAD_OFF(source->t_source_timer); | |
196 | } | |
197 | ||
198 | static void igmp_source_timer_on(struct igmp_group *group, | |
199 | struct igmp_source *source, long interval_msec) | |
200 | { | |
201 | source_timer_off(group, source); | |
202 | struct pim_interface *pim_ifp = group->group_igmp_sock->interface->info; | |
203 | ||
204 | if (PIM_DEBUG_IGMP_EVENTS) { | |
205 | char group_str[INET_ADDRSTRLEN]; | |
206 | char source_str[INET_ADDRSTRLEN]; | |
207 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
208 | sizeof(group_str)); | |
209 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
210 | sizeof(source_str)); | |
211 | zlog_debug( | |
212 | "Scheduling %ld.%03ld sec TIMER event for group %s source %s on %s", | |
213 | interval_msec / 1000, interval_msec % 1000, group_str, | |
214 | source_str, group->group_igmp_sock->interface->name); | |
215 | } | |
216 | ||
217 | thread_add_timer_msec(router->master, igmp_source_timer, source, | |
218 | interval_msec, &source->t_source_timer); | |
219 | ||
220 | /* | |
221 | RFC 3376: 6.3. IGMPv3 Source-Specific Forwarding Rules | |
222 | ||
223 | Source timer switched from (T == 0) to (T > 0): enable forwarding. | |
224 | */ | |
225 | igmp_source_forward_start(pim_ifp->pim, source); | |
226 | } | |
227 | ||
228 | void igmp_source_reset_gmi(struct igmp_sock *igmp, struct igmp_group *group, | |
229 | struct igmp_source *source) | |
230 | { | |
231 | long group_membership_interval_msec; | |
232 | struct pim_interface *pim_ifp; | |
233 | struct interface *ifp; | |
234 | ||
235 | ifp = igmp->interface; | |
236 | pim_ifp = ifp->info; | |
237 | ||
238 | group_membership_interval_msec = PIM_IGMP_GMI_MSEC( | |
239 | igmp->querier_robustness_variable, igmp->querier_query_interval, | |
240 | pim_ifp->igmp_query_max_response_time_dsec); | |
241 | ||
242 | if (PIM_DEBUG_IGMP_TRACE) { | |
243 | char group_str[INET_ADDRSTRLEN]; | |
244 | char source_str[INET_ADDRSTRLEN]; | |
245 | ||
246 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
247 | sizeof(group_str)); | |
248 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
249 | sizeof(source_str)); | |
250 | ||
251 | zlog_debug( | |
252 | "Resetting source %s timer to GMI=%ld.%03ld sec for group %s on %s", | |
253 | source_str, group_membership_interval_msec / 1000, | |
254 | group_membership_interval_msec % 1000, group_str, | |
255 | ifp->name); | |
256 | } | |
257 | ||
258 | igmp_source_timer_on(group, source, group_membership_interval_msec); | |
259 | } | |
260 | ||
261 | static void source_mark_delete_flag(struct igmp_group *group) | |
262 | { | |
263 | struct listnode *src_node; | |
264 | struct igmp_source *src; | |
265 | ||
266 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { | |
267 | IGMP_SOURCE_DO_DELETE(src->source_flags); | |
268 | } | |
269 | } | |
270 | ||
271 | static void source_mark_send_flag(struct igmp_group *group) | |
272 | { | |
273 | struct listnode *src_node; | |
274 | struct igmp_source *src; | |
275 | ||
276 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { | |
277 | IGMP_SOURCE_DO_SEND(src->source_flags); | |
278 | } | |
279 | } | |
280 | ||
281 | static int source_mark_send_flag_by_timer(struct igmp_group *group) | |
282 | { | |
283 | struct listnode *src_node; | |
284 | struct igmp_source *src; | |
285 | int num_marked_sources = 0; | |
286 | ||
287 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { | |
288 | /* Is source timer running? */ | |
289 | if (src->t_source_timer) { | |
290 | IGMP_SOURCE_DO_SEND(src->source_flags); | |
291 | ++num_marked_sources; | |
292 | } else { | |
293 | IGMP_SOURCE_DONT_SEND(src->source_flags); | |
294 | } | |
295 | } | |
296 | ||
297 | return num_marked_sources; | |
298 | } | |
299 | ||
300 | static void source_clear_send_flag(struct list *source_list) | |
301 | { | |
302 | struct listnode *src_node; | |
303 | struct igmp_source *src; | |
304 | ||
305 | for (ALL_LIST_ELEMENTS_RO(source_list, src_node, src)) { | |
306 | IGMP_SOURCE_DONT_SEND(src->source_flags); | |
307 | } | |
308 | } | |
309 | ||
310 | /* | |
311 | Any source (*,G) is forwarded only if mode is EXCLUDE {empty} | |
312 | */ | |
313 | static void group_exclude_fwd_anysrc_ifempty(struct igmp_group *group) | |
314 | { | |
315 | struct pim_interface *pim_ifp = group->group_igmp_sock->interface->info; | |
316 | ||
317 | zassert(group->group_filtermode_isexcl); | |
318 | ||
319 | if (listcount(group->group_source_list) < 1) { | |
320 | igmp_anysource_forward_start(pim_ifp->pim, group); | |
321 | } | |
322 | } | |
323 | ||
324 | void igmp_source_free(struct igmp_source *source) | |
325 | { | |
326 | /* make sure there is no source timer running */ | |
327 | zassert(!source->t_source_timer); | |
328 | ||
329 | XFREE(MTYPE_PIM_IGMP_GROUP_SOURCE, source); | |
330 | } | |
331 | ||
332 | static void source_channel_oil_detach(struct igmp_source *source) | |
333 | { | |
334 | if (source->source_channel_oil) { | |
335 | pim_channel_oil_del(source->source_channel_oil); | |
336 | source->source_channel_oil = NULL; | |
337 | } | |
338 | } | |
339 | ||
340 | /* | |
341 | igmp_source_delete: stop fowarding, and delete the source | |
342 | igmp_source_forward_stop: stop fowarding, but keep the source | |
343 | */ | |
344 | void igmp_source_delete(struct igmp_source *source) | |
345 | { | |
346 | struct igmp_group *group; | |
347 | struct in_addr src; | |
348 | ||
349 | group = source->source_group; | |
350 | ||
351 | if (PIM_DEBUG_IGMP_TRACE) { | |
352 | char group_str[INET_ADDRSTRLEN]; | |
353 | char source_str[INET_ADDRSTRLEN]; | |
354 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
355 | sizeof(group_str)); | |
356 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
357 | sizeof(source_str)); | |
358 | zlog_debug( | |
359 | "Deleting IGMP source %s for group %s from socket %d interface %s c_oil ref_count %d", | |
360 | source_str, group_str, group->group_igmp_sock->fd, | |
361 | group->group_igmp_sock->interface->name, | |
362 | source->source_channel_oil | |
363 | ? source->source_channel_oil->oil_ref_count | |
364 | : 0); | |
365 | } | |
366 | ||
367 | source_timer_off(group, source); | |
368 | igmp_source_forward_stop(source); | |
369 | ||
370 | /* sanity check that forwarding has been disabled */ | |
371 | if (IGMP_SOURCE_TEST_FORWARDING(source->source_flags)) { | |
372 | char group_str[INET_ADDRSTRLEN]; | |
373 | char source_str[INET_ADDRSTRLEN]; | |
374 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
375 | sizeof(group_str)); | |
376 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
377 | sizeof(source_str)); | |
378 | zlog_warn( | |
379 | "%s: forwarding=ON(!) IGMP source %s for group %s from socket %d interface %s", | |
380 | __PRETTY_FUNCTION__, source_str, group_str, | |
381 | group->group_igmp_sock->fd, | |
382 | group->group_igmp_sock->interface->name); | |
383 | /* warning only */ | |
384 | } | |
385 | ||
386 | source_channel_oil_detach(source); | |
387 | ||
388 | /* | |
389 | notice that listnode_delete() can't be moved | |
390 | into igmp_source_free() because the later is | |
391 | called by list_delete_all_node() | |
392 | */ | |
393 | listnode_delete(group->group_source_list, source); | |
394 | ||
395 | src.s_addr = source->source_addr.s_addr; | |
396 | igmp_source_free(source); | |
397 | ||
398 | /* Group source list is empty and current source is * then | |
399 | *,G group going away so do not trigger start */ | |
400 | if (group->group_filtermode_isexcl | |
401 | && (listcount(group->group_source_list) != 0) | |
402 | && src.s_addr != INADDR_ANY) { | |
403 | group_exclude_fwd_anysrc_ifempty(group); | |
404 | } | |
405 | } | |
406 | ||
407 | static void source_delete_by_flag(struct list *source_list) | |
408 | { | |
409 | struct listnode *src_node; | |
410 | struct listnode *src_nextnode; | |
411 | struct igmp_source *src; | |
412 | ||
413 | for (ALL_LIST_ELEMENTS(source_list, src_node, src_nextnode, src)) | |
414 | if (IGMP_SOURCE_TEST_DELETE(src->source_flags)) | |
415 | igmp_source_delete(src); | |
416 | } | |
417 | ||
418 | void igmp_source_delete_expired(struct list *source_list) | |
419 | { | |
420 | struct listnode *src_node; | |
421 | struct listnode *src_nextnode; | |
422 | struct igmp_source *src; | |
423 | ||
424 | for (ALL_LIST_ELEMENTS(source_list, src_node, src_nextnode, src)) | |
425 | if (!src->t_source_timer) | |
426 | igmp_source_delete(src); | |
427 | } | |
428 | ||
429 | struct igmp_source *igmp_find_source_by_addr(struct igmp_group *group, | |
430 | struct in_addr src_addr) | |
431 | { | |
432 | struct listnode *src_node; | |
433 | struct igmp_source *src; | |
434 | ||
435 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) | |
436 | if (src_addr.s_addr == src->source_addr.s_addr) | |
437 | return src; | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | struct igmp_source *source_new(struct igmp_group *group, | |
443 | struct in_addr src_addr) | |
444 | { | |
445 | struct igmp_source *src; | |
446 | ||
447 | if (PIM_DEBUG_IGMP_TRACE) { | |
448 | char group_str[INET_ADDRSTRLEN]; | |
449 | char source_str[INET_ADDRSTRLEN]; | |
450 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
451 | sizeof(group_str)); | |
452 | pim_inet4_dump("<source?>", src_addr, source_str, | |
453 | sizeof(source_str)); | |
454 | zlog_debug( | |
455 | "Creating new IGMP source %s for group %s on socket %d interface %s", | |
456 | source_str, group_str, group->group_igmp_sock->fd, | |
457 | group->group_igmp_sock->interface->name); | |
458 | } | |
459 | ||
460 | src = XCALLOC(MTYPE_PIM_IGMP_GROUP_SOURCE, sizeof(*src)); | |
461 | ||
462 | src->t_source_timer = NULL; | |
463 | src->source_group = group; /* back pointer */ | |
464 | src->source_addr = src_addr; | |
465 | src->source_creation = pim_time_monotonic_sec(); | |
466 | src->source_flags = 0; | |
467 | src->source_query_retransmit_count = 0; | |
468 | src->source_channel_oil = NULL; | |
469 | ||
470 | listnode_add(group->group_source_list, src); | |
471 | ||
472 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
473 | igmp_anysource_forward_stop(group); | |
474 | ||
475 | return src; | |
476 | } | |
477 | ||
478 | static struct igmp_source *add_source_by_addr(struct igmp_sock *igmp, | |
479 | struct igmp_group *group, | |
480 | struct in_addr src_addr) | |
481 | { | |
482 | struct igmp_source *src; | |
483 | ||
484 | src = igmp_find_source_by_addr(group, src_addr); | |
485 | if (src) { | |
486 | return src; | |
487 | } | |
488 | ||
489 | src = source_new(group, src_addr); | |
490 | ||
491 | return src; | |
492 | } | |
493 | ||
494 | static void allow(struct igmp_sock *igmp, struct in_addr from, | |
495 | struct in_addr group_addr, int num_sources, | |
496 | struct in_addr *sources) | |
497 | { | |
498 | struct igmp_source *source; | |
499 | struct igmp_group *group; | |
500 | int i; | |
501 | ||
502 | /* non-existant group is created as INCLUDE {empty} */ | |
503 | group = igmp_add_group_by_addr(igmp, group_addr); | |
504 | if (!group) { | |
505 | return; | |
506 | } | |
507 | ||
508 | /* scan received sources */ | |
509 | for (i = 0; i < num_sources; ++i) { | |
510 | struct in_addr *src_addr; | |
511 | ||
512 | src_addr = sources + i; | |
513 | ||
514 | source = add_source_by_addr(igmp, group, *src_addr); | |
515 | if (!source) { | |
516 | continue; | |
517 | } | |
518 | ||
519 | /* | |
520 | RFC 3376: 6.4.1. Reception of Current-State Records | |
521 | ||
522 | When receiving IS_IN reports for groups in EXCLUDE mode is | |
523 | sources should be moved from set with (timers = 0) to set with | |
524 | (timers > 0). | |
525 | ||
526 | igmp_source_reset_gmi() below, resetting the source timers to | |
527 | GMI, accomplishes this. | |
528 | */ | |
529 | igmp_source_reset_gmi(igmp, group, source); | |
530 | ||
531 | } /* scan received sources */ | |
532 | ||
533 | if ((num_sources == 0) && (group->group_filtermode_isexcl) | |
534 | && (listcount(group->group_source_list) == 1)) { | |
535 | struct in_addr star = {.s_addr = INADDR_ANY}; | |
536 | ||
537 | source = igmp_find_source_by_addr(group, star); | |
538 | if (source) | |
539 | igmp_source_reset_gmi(igmp, group, source); | |
540 | } | |
541 | } | |
542 | ||
543 | void igmpv3_report_isin(struct igmp_sock *igmp, struct in_addr from, | |
544 | struct in_addr group_addr, int num_sources, | |
545 | struct in_addr *sources) | |
546 | { | |
547 | on_trace(__PRETTY_FUNCTION__, igmp->interface, from, group_addr, | |
548 | num_sources, sources); | |
549 | ||
550 | allow(igmp, from, group_addr, num_sources, sources); | |
551 | } | |
552 | ||
553 | static void isex_excl(struct igmp_group *group, int num_sources, | |
554 | struct in_addr *sources) | |
555 | { | |
556 | struct igmp_source *source; | |
557 | int i; | |
558 | ||
559 | /* EXCLUDE mode */ | |
560 | zassert(group->group_filtermode_isexcl); | |
561 | ||
562 | /* E.1: set deletion flag for known sources (X,Y) */ | |
563 | source_mark_delete_flag(group); | |
564 | ||
565 | /* scan received sources (A) */ | |
566 | for (i = 0; i < num_sources; ++i) { | |
567 | struct in_addr *src_addr; | |
568 | ||
569 | src_addr = sources + i; | |
570 | ||
571 | /* E.2: lookup reported source from (A) in (X,Y) */ | |
572 | source = igmp_find_source_by_addr(group, *src_addr); | |
573 | if (source) { | |
574 | /* E.3: if found, clear deletion flag: (X*A) or (Y*A) */ | |
575 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
576 | } else { | |
577 | /* E.4: if not found, create source with timer=GMI: | |
578 | * (A-X-Y) */ | |
579 | source = source_new(group, *src_addr); | |
580 | zassert(!source->t_source_timer); /* timer == 0 */ | |
581 | igmp_source_reset_gmi(group->group_igmp_sock, group, | |
582 | source); | |
583 | zassert(source->t_source_timer); /* (A-X-Y) timer > 0 */ | |
584 | } | |
585 | ||
586 | } /* scan received sources */ | |
587 | ||
588 | /* | |
589 | * If we are in isexcl mode and num_sources == 0 | |
590 | * than that means we have a *,g entry that | |
591 | * needs to be handled | |
592 | */ | |
593 | if (group->group_filtermode_isexcl && num_sources == 0) { | |
594 | struct in_addr star = {.s_addr = INADDR_ANY}; | |
595 | source = igmp_find_source_by_addr(group, star); | |
596 | if (source) { | |
597 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
598 | igmp_source_reset_gmi(group->group_igmp_sock, group, | |
599 | source); | |
600 | } | |
601 | } | |
602 | ||
603 | /* E.5: delete all sources marked with deletion flag: (X-A) and (Y-A) */ | |
604 | source_delete_by_flag(group->group_source_list); | |
605 | } | |
606 | ||
607 | static void isex_incl(struct igmp_group *group, int num_sources, | |
608 | struct in_addr *sources) | |
609 | { | |
610 | int i; | |
611 | ||
612 | /* INCLUDE mode */ | |
613 | zassert(!group->group_filtermode_isexcl); | |
614 | ||
615 | /* I.1: set deletion flag for known sources (A) */ | |
616 | source_mark_delete_flag(group); | |
617 | ||
618 | /* scan received sources (B) */ | |
619 | for (i = 0; i < num_sources; ++i) { | |
620 | struct igmp_source *source; | |
621 | struct in_addr *src_addr; | |
622 | ||
623 | src_addr = sources + i; | |
624 | ||
625 | /* I.2: lookup reported source (B) */ | |
626 | source = igmp_find_source_by_addr(group, *src_addr); | |
627 | if (source) { | |
628 | /* I.3: if found, clear deletion flag (A*B) */ | |
629 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
630 | } else { | |
631 | /* I.4: if not found, create source with timer=0 (B-A) | |
632 | */ | |
633 | source = source_new(group, *src_addr); | |
634 | zassert(!source->t_source_timer); /* (B-A) timer=0 */ | |
635 | } | |
636 | ||
637 | } /* scan received sources */ | |
638 | ||
639 | /* I.5: delete all sources marked with deletion flag (A-B) */ | |
640 | source_delete_by_flag(group->group_source_list); | |
641 | ||
642 | group->group_filtermode_isexcl = 1; /* boolean=true */ | |
643 | ||
644 | zassert(group->group_filtermode_isexcl); | |
645 | ||
646 | group_exclude_fwd_anysrc_ifempty(group); | |
647 | } | |
648 | ||
649 | void igmpv3_report_isex(struct igmp_sock *igmp, struct in_addr from, | |
650 | struct in_addr group_addr, int num_sources, | |
651 | struct in_addr *sources, int from_igmp_v2_report) | |
652 | { | |
653 | struct interface *ifp = igmp->interface; | |
654 | struct igmp_group *group; | |
655 | ||
656 | on_trace(__PRETTY_FUNCTION__, ifp, from, group_addr, num_sources, | |
657 | sources); | |
658 | ||
659 | if (pim_is_group_filtered(ifp->info, &group_addr)) | |
660 | return; | |
661 | ||
662 | /* non-existant group is created as INCLUDE {empty} */ | |
663 | group = igmp_add_group_by_addr(igmp, group_addr); | |
664 | if (!group) { | |
665 | return; | |
666 | } | |
667 | ||
668 | /* So we can display how we learned the group in our show command output | |
669 | */ | |
670 | if (from_igmp_v2_report) | |
671 | group->igmp_version = 2; | |
672 | ||
673 | if (group->group_filtermode_isexcl) { | |
674 | /* EXCLUDE mode */ | |
675 | isex_excl(group, num_sources, sources); | |
676 | } else { | |
677 | /* INCLUDE mode */ | |
678 | isex_incl(group, num_sources, sources); | |
679 | zassert(group->group_filtermode_isexcl); | |
680 | } | |
681 | ||
682 | zassert(group->group_filtermode_isexcl); | |
683 | ||
684 | igmp_group_reset_gmi(group); | |
685 | } | |
686 | ||
687 | static void toin_incl(struct igmp_group *group, int num_sources, | |
688 | struct in_addr *sources) | |
689 | { | |
690 | struct igmp_sock *igmp = group->group_igmp_sock; | |
691 | int num_sources_tosend = listcount(group->group_source_list); | |
692 | int i; | |
693 | ||
694 | /* Set SEND flag for all known sources (A) */ | |
695 | source_mark_send_flag(group); | |
696 | ||
697 | /* Scan received sources (B) */ | |
698 | for (i = 0; i < num_sources; ++i) { | |
699 | struct igmp_source *source; | |
700 | struct in_addr *src_addr; | |
701 | ||
702 | src_addr = sources + i; | |
703 | ||
704 | /* Lookup reported source (B) */ | |
705 | source = igmp_find_source_by_addr(group, *src_addr); | |
706 | if (source) { | |
707 | /* If found, clear SEND flag (A*B) */ | |
708 | IGMP_SOURCE_DONT_SEND(source->source_flags); | |
709 | --num_sources_tosend; | |
710 | } else { | |
711 | /* If not found, create new source */ | |
712 | source = source_new(group, *src_addr); | |
713 | } | |
714 | ||
715 | /* (B)=GMI */ | |
716 | igmp_source_reset_gmi(igmp, group, source); | |
717 | } | |
718 | ||
719 | /* Send sources marked with SEND flag: Q(G,A-B) */ | |
720 | if (num_sources_tosend > 0) { | |
721 | source_query_send_by_flag(group, num_sources_tosend); | |
722 | } | |
723 | } | |
724 | ||
725 | static void toin_excl(struct igmp_group *group, int num_sources, | |
726 | struct in_addr *sources) | |
727 | { | |
728 | struct igmp_sock *igmp = group->group_igmp_sock; | |
729 | int num_sources_tosend; | |
730 | int i; | |
731 | ||
732 | /* Set SEND flag for X (sources with timer > 0) */ | |
733 | num_sources_tosend = source_mark_send_flag_by_timer(group); | |
734 | ||
735 | /* Scan received sources (A) */ | |
736 | for (i = 0; i < num_sources; ++i) { | |
737 | struct igmp_source *source; | |
738 | struct in_addr *src_addr; | |
739 | ||
740 | src_addr = sources + i; | |
741 | ||
742 | /* Lookup reported source (A) */ | |
743 | source = igmp_find_source_by_addr(group, *src_addr); | |
744 | if (source) { | |
745 | if (source->t_source_timer) { | |
746 | /* If found and timer running, clear SEND flag | |
747 | * (X*A) */ | |
748 | IGMP_SOURCE_DONT_SEND(source->source_flags); | |
749 | --num_sources_tosend; | |
750 | } | |
751 | } else { | |
752 | /* If not found, create new source */ | |
753 | source = source_new(group, *src_addr); | |
754 | } | |
755 | ||
756 | /* (A)=GMI */ | |
757 | igmp_source_reset_gmi(igmp, group, source); | |
758 | } | |
759 | ||
760 | /* Send sources marked with SEND flag: Q(G,X-A) */ | |
761 | if (num_sources_tosend > 0) { | |
762 | source_query_send_by_flag(group, num_sources_tosend); | |
763 | } | |
764 | ||
765 | /* Send Q(G) */ | |
766 | group_query_send(group); | |
767 | } | |
768 | ||
769 | void igmpv3_report_toin(struct igmp_sock *igmp, struct in_addr from, | |
770 | struct in_addr group_addr, int num_sources, | |
771 | struct in_addr *sources) | |
772 | { | |
773 | struct interface *ifp = igmp->interface; | |
774 | struct igmp_group *group; | |
775 | ||
776 | on_trace(__PRETTY_FUNCTION__, ifp, from, group_addr, num_sources, | |
777 | sources); | |
778 | ||
779 | /* | |
780 | * If the requested filter mode is INCLUDE *and* the requested source | |
781 | * list is empty, then the entry corresponding to the requested | |
782 | * interface and multicast address is deleted if present. If no such | |
783 | * entry is present, the request is ignored. | |
784 | */ | |
785 | if (num_sources) { | |
786 | /* non-existant group is created as INCLUDE {empty} */ | |
787 | group = igmp_add_group_by_addr(igmp, group_addr); | |
788 | if (!group) { | |
789 | return; | |
790 | } | |
791 | } else { | |
792 | group = find_group_by_addr(igmp, group_addr); | |
793 | if (!group) | |
794 | return; | |
795 | } | |
796 | ||
797 | if (group->group_filtermode_isexcl) { | |
798 | /* EXCLUDE mode */ | |
799 | toin_excl(group, num_sources, sources); | |
800 | } else { | |
801 | /* INCLUDE mode */ | |
802 | toin_incl(group, num_sources, sources); | |
803 | } | |
804 | } | |
805 | ||
806 | static void toex_incl(struct igmp_group *group, int num_sources, | |
807 | struct in_addr *sources) | |
808 | { | |
809 | int num_sources_tosend = 0; | |
810 | int i; | |
811 | ||
812 | zassert(!group->group_filtermode_isexcl); | |
813 | ||
814 | /* Set DELETE flag for all known sources (A) */ | |
815 | source_mark_delete_flag(group); | |
816 | ||
817 | /* Clear off SEND flag from all known sources (A) */ | |
818 | source_clear_send_flag(group->group_source_list); | |
819 | ||
820 | /* Scan received sources (B) */ | |
821 | for (i = 0; i < num_sources; ++i) { | |
822 | struct igmp_source *source; | |
823 | struct in_addr *src_addr; | |
824 | ||
825 | src_addr = sources + i; | |
826 | ||
827 | /* Lookup reported source (B) */ | |
828 | source = igmp_find_source_by_addr(group, *src_addr); | |
829 | if (source) { | |
830 | /* If found, clear deletion flag: (A*B) */ | |
831 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
832 | /* and set SEND flag (A*B) */ | |
833 | IGMP_SOURCE_DO_SEND(source->source_flags); | |
834 | ++num_sources_tosend; | |
835 | } else { | |
836 | /* If source not found, create source with timer=0: | |
837 | * (B-A)=0 */ | |
838 | source = source_new(group, *src_addr); | |
839 | zassert(!source->t_source_timer); /* (B-A) timer=0 */ | |
840 | } | |
841 | ||
842 | } /* Scan received sources (B) */ | |
843 | ||
844 | group->group_filtermode_isexcl = 1; /* boolean=true */ | |
845 | ||
846 | /* Delete all sources marked with DELETE flag (A-B) */ | |
847 | source_delete_by_flag(group->group_source_list); | |
848 | ||
849 | /* Send sources marked with SEND flag: Q(G,A*B) */ | |
850 | if (num_sources_tosend > 0) { | |
851 | source_query_send_by_flag(group, num_sources_tosend); | |
852 | } | |
853 | ||
854 | zassert(group->group_filtermode_isexcl); | |
855 | ||
856 | group_exclude_fwd_anysrc_ifempty(group); | |
857 | } | |
858 | ||
859 | static void toex_excl(struct igmp_group *group, int num_sources, | |
860 | struct in_addr *sources) | |
861 | { | |
862 | int num_sources_tosend = 0; | |
863 | int i; | |
864 | ||
865 | /* set DELETE flag for all known sources (X,Y) */ | |
866 | source_mark_delete_flag(group); | |
867 | ||
868 | /* clear off SEND flag from all known sources (X,Y) */ | |
869 | source_clear_send_flag(group->group_source_list); | |
870 | ||
871 | if (num_sources == 0) { | |
872 | struct igmp_source *source; | |
873 | struct in_addr any = {.s_addr = INADDR_ANY}; | |
874 | ||
875 | source = igmp_find_source_by_addr(group, any); | |
876 | if (source) | |
877 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
878 | } | |
879 | ||
880 | /* scan received sources (A) */ | |
881 | for (i = 0; i < num_sources; ++i) { | |
882 | struct igmp_source *source; | |
883 | struct in_addr *src_addr; | |
884 | ||
885 | src_addr = sources + i; | |
886 | ||
887 | /* lookup reported source (A) in known sources (X,Y) */ | |
888 | source = igmp_find_source_by_addr(group, *src_addr); | |
889 | if (source) { | |
890 | /* if found, clear off DELETE flag from reported source | |
891 | * (A) */ | |
892 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
893 | } else { | |
894 | /* if not found, create source with Group Timer: | |
895 | * (A-X-Y)=Group Timer */ | |
896 | long group_timer_msec; | |
897 | source = source_new(group, *src_addr); | |
898 | ||
899 | zassert(!source->t_source_timer); /* timer == 0 */ | |
900 | group_timer_msec = igmp_group_timer_remain_msec(group); | |
901 | igmp_source_timer_on(group, source, group_timer_msec); | |
902 | zassert(source->t_source_timer); /* (A-X-Y) timer > 0 */ | |
903 | ||
904 | /* make sure source is created with DELETE flag unset */ | |
905 | zassert(!IGMP_SOURCE_TEST_DELETE(source->source_flags)); | |
906 | } | |
907 | ||
908 | /* make sure reported source has DELETE flag unset */ | |
909 | zassert(!IGMP_SOURCE_TEST_DELETE(source->source_flags)); | |
910 | ||
911 | if (source->t_source_timer) { | |
912 | /* if source timer>0 mark SEND flag: Q(G,A-Y) */ | |
913 | IGMP_SOURCE_DO_SEND(source->source_flags); | |
914 | ++num_sources_tosend; | |
915 | } | |
916 | ||
917 | } /* scan received sources (A) */ | |
918 | ||
919 | /* | |
920 | delete all sources marked with DELETE flag: | |
921 | Delete (X-A) | |
922 | Delete (Y-A) | |
923 | */ | |
924 | source_delete_by_flag(group->group_source_list); | |
925 | ||
926 | /* send sources marked with SEND flag: Q(G,A-Y) */ | |
927 | if (num_sources_tosend > 0) { | |
928 | source_query_send_by_flag(group, num_sources_tosend); | |
929 | } | |
930 | } | |
931 | ||
932 | void igmpv3_report_toex(struct igmp_sock *igmp, struct in_addr from, | |
933 | struct in_addr group_addr, int num_sources, | |
934 | struct in_addr *sources) | |
935 | { | |
936 | struct interface *ifp = igmp->interface; | |
937 | struct igmp_group *group; | |
938 | ||
939 | on_trace(__PRETTY_FUNCTION__, ifp, from, group_addr, num_sources, | |
940 | sources); | |
941 | ||
942 | /* non-existant group is created as INCLUDE {empty} */ | |
943 | group = igmp_add_group_by_addr(igmp, group_addr); | |
944 | if (!group) { | |
945 | return; | |
946 | } | |
947 | ||
948 | if (group->group_filtermode_isexcl) { | |
949 | /* EXCLUDE mode */ | |
950 | toex_excl(group, num_sources, sources); | |
951 | } else { | |
952 | /* INCLUDE mode */ | |
953 | toex_incl(group, num_sources, sources); | |
954 | zassert(group->group_filtermode_isexcl); | |
955 | } | |
956 | zassert(group->group_filtermode_isexcl); | |
957 | ||
958 | /* Group Timer=GMI */ | |
959 | igmp_group_reset_gmi(group); | |
960 | } | |
961 | ||
962 | void igmpv3_report_allow(struct igmp_sock *igmp, struct in_addr from, | |
963 | struct in_addr group_addr, int num_sources, | |
964 | struct in_addr *sources) | |
965 | { | |
966 | on_trace(__PRETTY_FUNCTION__, igmp->interface, from, group_addr, | |
967 | num_sources, sources); | |
968 | ||
969 | allow(igmp, from, group_addr, num_sources, sources); | |
970 | } | |
971 | ||
972 | /* | |
973 | RFC3376: 6.6.3.1. Building and Sending Group Specific Queries | |
974 | ||
975 | When transmitting a group specific query, if the group timer is | |
976 | larger than LMQT, the "Suppress Router-Side Processing" bit is set | |
977 | in the query message. | |
978 | */ | |
979 | static void group_retransmit_group(struct igmp_group *group) | |
980 | { | |
981 | struct igmp_sock *igmp; | |
982 | struct pim_interface *pim_ifp; | |
983 | long lmqc; /* Last Member Query Count */ | |
984 | long lmqi_msec; /* Last Member Query Interval */ | |
985 | long lmqt_msec; /* Last Member Query Time */ | |
986 | int s_flag; | |
987 | int query_buf_size; | |
988 | ||
989 | igmp = group->group_igmp_sock; | |
990 | pim_ifp = igmp->interface->info; | |
991 | ||
992 | if (pim_ifp->igmp_version == 3) { | |
993 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; | |
994 | } else { | |
995 | query_buf_size = IGMP_V12_MSG_SIZE; | |
996 | } | |
997 | ||
998 | char query_buf[query_buf_size]; | |
999 | ||
1000 | lmqc = igmp->querier_robustness_variable; | |
1001 | lmqi_msec = 100 * pim_ifp->igmp_specific_query_max_response_time_dsec; | |
1002 | lmqt_msec = lmqc * lmqi_msec; | |
1003 | ||
1004 | /* | |
1005 | RFC3376: 6.6.3.1. Building and Sending Group Specific Queries | |
1006 | ||
1007 | When transmitting a group specific query, if the group timer is | |
1008 | larger than LMQT, the "Suppress Router-Side Processing" bit is set | |
1009 | in the query message. | |
1010 | */ | |
1011 | s_flag = igmp_group_timer_remain_msec(group) > lmqt_msec; | |
1012 | ||
1013 | if (PIM_DEBUG_IGMP_TRACE) { | |
1014 | char group_str[INET_ADDRSTRLEN]; | |
1015 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1016 | sizeof(group_str)); | |
1017 | zlog_debug( | |
1018 | "retransmit_group_specific_query: group %s on %s: s_flag=%d count=%d", | |
1019 | group_str, igmp->interface->name, s_flag, | |
1020 | group->group_specific_query_retransmit_count); | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
1025 | ||
1026 | Group-Specific and Group-and-Source-Specific Queries are sent with | |
1027 | an IP destination address equal to the multicast address of | |
1028 | interest. | |
1029 | */ | |
1030 | ||
1031 | igmp_send_query(pim_ifp->igmp_version, group, igmp->fd, | |
1032 | igmp->interface->name, query_buf, sizeof(query_buf), | |
1033 | 0 /* num_sources_tosend */, | |
1034 | group->group_addr /* dst_addr */, | |
1035 | group->group_addr /* group_addr */, | |
1036 | pim_ifp->igmp_specific_query_max_response_time_dsec, | |
1037 | s_flag, igmp->querier_robustness_variable, | |
1038 | igmp->querier_query_interval); | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | RFC3376: 6.6.3.2. Building and Sending Group and Source Specific Queries | |
1043 | ||
1044 | When building a group and source specific query for a group G, two | |
1045 | separate query messages are sent for the group. The first one has | |
1046 | the "Suppress Router-Side Processing" bit set and contains all the | |
1047 | sources with retransmission state and timers greater than LMQT. The | |
1048 | second has the "Suppress Router-Side Processing" bit clear and | |
1049 | contains all the sources with retransmission state and timers lower | |
1050 | or equal to LMQT. If either of the two calculated messages does not | |
1051 | contain any sources, then its transmission is suppressed. | |
1052 | */ | |
1053 | static int group_retransmit_sources(struct igmp_group *group, | |
1054 | int send_with_sflag_set) | |
1055 | { | |
1056 | struct igmp_sock *igmp; | |
1057 | struct pim_interface *pim_ifp; | |
1058 | long lmqc; /* Last Member Query Count */ | |
1059 | long lmqi_msec; /* Last Member Query Interval */ | |
1060 | long lmqt_msec; /* Last Member Query Time */ | |
1061 | char query_buf1[PIM_IGMP_BUFSIZE_WRITE]; /* 1 = with s_flag set */ | |
1062 | char query_buf2[PIM_IGMP_BUFSIZE_WRITE]; /* 2 = with s_flag clear */ | |
1063 | int query_buf1_max_sources; | |
1064 | int query_buf2_max_sources; | |
1065 | struct in_addr *source_addr1; | |
1066 | struct in_addr *source_addr2; | |
1067 | int num_sources_tosend1; | |
1068 | int num_sources_tosend2; | |
1069 | struct listnode *src_node; | |
1070 | struct igmp_source *src; | |
1071 | int num_retransmit_sources_left = 0; | |
1072 | ||
1073 | source_addr1 = (struct in_addr *)(query_buf1 + IGMP_V3_SOURCES_OFFSET); | |
1074 | source_addr2 = (struct in_addr *)(query_buf2 + IGMP_V3_SOURCES_OFFSET); | |
1075 | ||
1076 | igmp = group->group_igmp_sock; | |
1077 | pim_ifp = igmp->interface->info; | |
1078 | ||
1079 | lmqc = igmp->querier_robustness_variable; | |
1080 | lmqi_msec = 100 * pim_ifp->igmp_specific_query_max_response_time_dsec; | |
1081 | lmqt_msec = lmqc * lmqi_msec; | |
1082 | ||
1083 | /* Scan all group sources */ | |
1084 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { | |
1085 | ||
1086 | /* Source has retransmission state? */ | |
1087 | if (src->source_query_retransmit_count < 1) | |
1088 | continue; | |
1089 | ||
1090 | if (--src->source_query_retransmit_count > 0) { | |
1091 | ++num_retransmit_sources_left; | |
1092 | } | |
1093 | ||
1094 | /* Copy source address into appropriate query buffer */ | |
1095 | if (igmp_source_timer_remain_msec(src) > lmqt_msec) { | |
1096 | *source_addr1 = src->source_addr; | |
1097 | ++source_addr1; | |
1098 | } else { | |
1099 | *source_addr2 = src->source_addr; | |
1100 | ++source_addr2; | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | num_sources_tosend1 = | |
1105 | source_addr1 | |
1106 | - (struct in_addr *)(query_buf1 + IGMP_V3_SOURCES_OFFSET); | |
1107 | num_sources_tosend2 = | |
1108 | source_addr2 | |
1109 | - (struct in_addr *)(query_buf2 + IGMP_V3_SOURCES_OFFSET); | |
1110 | ||
1111 | if (PIM_DEBUG_IGMP_TRACE) { | |
1112 | char group_str[INET_ADDRSTRLEN]; | |
1113 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1114 | sizeof(group_str)); | |
1115 | zlog_debug( | |
1116 | "retransmit_grp&src_specific_query: group %s on %s: srcs_with_sflag=%d srcs_wo_sflag=%d will_send_sflag=%d retransmit_src_left=%d", | |
1117 | group_str, igmp->interface->name, num_sources_tosend1, | |
1118 | num_sources_tosend2, send_with_sflag_set, | |
1119 | num_retransmit_sources_left); | |
1120 | } | |
1121 | ||
1122 | if (num_sources_tosend1 > 0) { | |
1123 | /* | |
1124 | Send group-and-source-specific query with s_flag set and all | |
1125 | sources with timers greater than LMQT. | |
1126 | */ | |
1127 | ||
1128 | if (send_with_sflag_set) { | |
1129 | ||
1130 | query_buf1_max_sources = | |
1131 | (sizeof(query_buf1) - IGMP_V3_SOURCES_OFFSET) | |
1132 | >> 2; | |
1133 | if (num_sources_tosend1 > query_buf1_max_sources) { | |
1134 | char group_str[INET_ADDRSTRLEN]; | |
1135 | pim_inet4_dump("<group?>", group->group_addr, | |
1136 | group_str, sizeof(group_str)); | |
1137 | zlog_warn( | |
1138 | "%s: group %s on %s: s_flag=1 unable to fit %d sources into buf_size=%zu (max_sources=%d)", | |
1139 | __PRETTY_FUNCTION__, group_str, | |
1140 | igmp->interface->name, | |
1141 | num_sources_tosend1, sizeof(query_buf1), | |
1142 | query_buf1_max_sources); | |
1143 | } else { | |
1144 | /* | |
1145 | RFC3376: 4.1.12. IP Destination Addresses for | |
1146 | Queries | |
1147 | ||
1148 | Group-Specific and Group-and-Source-Specific | |
1149 | Queries are sent with | |
1150 | an IP destination address equal to the | |
1151 | multicast address of | |
1152 | interest. | |
1153 | */ | |
1154 | ||
1155 | igmp_send_query( | |
1156 | pim_ifp->igmp_version, group, igmp->fd, | |
1157 | igmp->interface->name, query_buf1, | |
1158 | sizeof(query_buf1), num_sources_tosend1, | |
1159 | group->group_addr, group->group_addr, | |
1160 | pim_ifp->igmp_specific_query_max_response_time_dsec, | |
1161 | 1 /* s_flag */, | |
1162 | igmp->querier_robustness_variable, | |
1163 | igmp->querier_query_interval); | |
1164 | } | |
1165 | ||
1166 | } /* send_with_sflag_set */ | |
1167 | } | |
1168 | ||
1169 | if (num_sources_tosend2 > 0) { | |
1170 | /* | |
1171 | Send group-and-source-specific query with s_flag clear and all | |
1172 | sources with timers lower or equal to LMQT. | |
1173 | */ | |
1174 | ||
1175 | query_buf2_max_sources = | |
1176 | (sizeof(query_buf2) - IGMP_V3_SOURCES_OFFSET) >> 2; | |
1177 | if (num_sources_tosend2 > query_buf2_max_sources) { | |
1178 | char group_str[INET_ADDRSTRLEN]; | |
1179 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1180 | sizeof(group_str)); | |
1181 | zlog_warn( | |
1182 | "%s: group %s on %s: s_flag=0 unable to fit %d sources into buf_size=%zu (max_sources=%d)", | |
1183 | __PRETTY_FUNCTION__, group_str, | |
1184 | igmp->interface->name, num_sources_tosend2, | |
1185 | sizeof(query_buf2), query_buf2_max_sources); | |
1186 | } else { | |
1187 | /* | |
1188 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
1189 | ||
1190 | Group-Specific and Group-and-Source-Specific Queries | |
1191 | are sent with | |
1192 | an IP destination address equal to the multicast | |
1193 | address of | |
1194 | interest. | |
1195 | */ | |
1196 | ||
1197 | igmp_send_query( | |
1198 | pim_ifp->igmp_version, group, igmp->fd, | |
1199 | igmp->interface->name, query_buf2, | |
1200 | sizeof(query_buf2), num_sources_tosend2, | |
1201 | group->group_addr, group->group_addr, | |
1202 | pim_ifp->igmp_specific_query_max_response_time_dsec, | |
1203 | 0 /* s_flag */, | |
1204 | igmp->querier_robustness_variable, | |
1205 | igmp->querier_query_interval); | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | return num_retransmit_sources_left; | |
1210 | } | |
1211 | ||
1212 | static int igmp_group_retransmit(struct thread *t) | |
1213 | { | |
1214 | struct igmp_group *group; | |
1215 | int num_retransmit_sources_left; | |
1216 | int send_with_sflag_set; /* boolean */ | |
1217 | ||
1218 | group = THREAD_ARG(t); | |
1219 | ||
1220 | if (PIM_DEBUG_IGMP_TRACE) { | |
1221 | char group_str[INET_ADDRSTRLEN]; | |
1222 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1223 | sizeof(group_str)); | |
1224 | zlog_debug("group_retransmit_timer: group %s on %s", group_str, | |
1225 | group->group_igmp_sock->interface->name); | |
1226 | } | |
1227 | ||
1228 | /* Retransmit group-specific queries? (RFC3376: 6.6.3.1) */ | |
1229 | if (group->group_specific_query_retransmit_count > 0) { | |
1230 | ||
1231 | /* Retransmit group-specific queries (RFC3376: 6.6.3.1) */ | |
1232 | group_retransmit_group(group); | |
1233 | --group->group_specific_query_retransmit_count; | |
1234 | ||
1235 | /* | |
1236 | RFC3376: 6.6.3.2 | |
1237 | If a group specific query is scheduled to be transmitted at | |
1238 | the | |
1239 | same time as a group and source specific query for the same | |
1240 | group, | |
1241 | then transmission of the group and source specific message | |
1242 | with the | |
1243 | "Suppress Router-Side Processing" bit set may be suppressed. | |
1244 | */ | |
1245 | send_with_sflag_set = 0; /* boolean=false */ | |
1246 | } else { | |
1247 | send_with_sflag_set = 1; /* boolean=true */ | |
1248 | } | |
1249 | ||
1250 | /* Retransmit group-and-source-specific queries (RFC3376: 6.6.3.2) */ | |
1251 | num_retransmit_sources_left = | |
1252 | group_retransmit_sources(group, send_with_sflag_set); | |
1253 | ||
1254 | /* | |
1255 | Keep group retransmit timer running if there is any retransmit | |
1256 | counter pending | |
1257 | */ | |
1258 | if ((num_retransmit_sources_left > 0) | |
1259 | || (group->group_specific_query_retransmit_count > 0)) { | |
1260 | group_retransmit_timer_on(group); | |
1261 | } | |
1262 | ||
1263 | return 0; | |
1264 | } | |
1265 | ||
1266 | /* | |
1267 | group_retransmit_timer_on: | |
1268 | if group retransmit timer isn't running, starts it; | |
1269 | otherwise, do nothing | |
1270 | */ | |
1271 | static void group_retransmit_timer_on(struct igmp_group *group) | |
1272 | { | |
1273 | struct igmp_sock *igmp; | |
1274 | struct pim_interface *pim_ifp; | |
1275 | long lmqi_msec; /* Last Member Query Interval */ | |
1276 | ||
1277 | /* if group retransmit timer is running, do nothing */ | |
1278 | if (group->t_group_query_retransmit_timer) { | |
1279 | return; | |
1280 | } | |
1281 | ||
1282 | igmp = group->group_igmp_sock; | |
1283 | pim_ifp = igmp->interface->info; | |
1284 | ||
1285 | lmqi_msec = 100 * pim_ifp->igmp_specific_query_max_response_time_dsec; | |
1286 | ||
1287 | if (PIM_DEBUG_IGMP_TRACE) { | |
1288 | char group_str[INET_ADDRSTRLEN]; | |
1289 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1290 | sizeof(group_str)); | |
1291 | zlog_debug( | |
1292 | "Scheduling %ld.%03ld sec retransmit timer for group %s on %s", | |
1293 | lmqi_msec / 1000, lmqi_msec % 1000, group_str, | |
1294 | igmp->interface->name); | |
1295 | } | |
1296 | ||
1297 | thread_add_timer_msec(router->master, igmp_group_retransmit, group, | |
1298 | lmqi_msec, | |
1299 | &group->t_group_query_retransmit_timer); | |
1300 | } | |
1301 | ||
1302 | static long igmp_group_timer_remain_msec(struct igmp_group *group) | |
1303 | { | |
1304 | return pim_time_timer_remain_msec(group->t_group_timer); | |
1305 | } | |
1306 | ||
1307 | static long igmp_source_timer_remain_msec(struct igmp_source *source) | |
1308 | { | |
1309 | return pim_time_timer_remain_msec(source->t_source_timer); | |
1310 | } | |
1311 | ||
1312 | /* | |
1313 | RFC3376: 6.6.3.1. Building and Sending Group Specific Queries | |
1314 | */ | |
1315 | static void group_query_send(struct igmp_group *group) | |
1316 | { | |
1317 | long lmqc; /* Last Member Query Count */ | |
1318 | ||
1319 | lmqc = group->group_igmp_sock->querier_robustness_variable; | |
1320 | ||
1321 | /* lower group timer to lmqt */ | |
1322 | igmp_group_timer_lower_to_lmqt(group); | |
1323 | ||
1324 | /* reset retransmission counter */ | |
1325 | group->group_specific_query_retransmit_count = lmqc; | |
1326 | ||
1327 | /* immediately send group specific query (decrease retransmit counter by | |
1328 | * 1)*/ | |
1329 | group_retransmit_group(group); | |
1330 | ||
1331 | /* make sure group retransmit timer is running */ | |
1332 | group_retransmit_timer_on(group); | |
1333 | } | |
1334 | ||
1335 | /* | |
1336 | RFC3376: 6.6.3.2. Building and Sending Group and Source Specific Queries | |
1337 | */ | |
1338 | static void source_query_send_by_flag(struct igmp_group *group, | |
1339 | int num_sources_tosend) | |
1340 | { | |
1341 | struct igmp_sock *igmp; | |
1342 | struct pim_interface *pim_ifp; | |
1343 | struct listnode *src_node; | |
1344 | struct igmp_source *src; | |
1345 | long lmqc; /* Last Member Query Count */ | |
1346 | long lmqi_msec; /* Last Member Query Interval */ | |
1347 | long lmqt_msec; /* Last Member Query Time */ | |
1348 | ||
1349 | zassert(num_sources_tosend > 0); | |
1350 | ||
1351 | igmp = group->group_igmp_sock; | |
1352 | pim_ifp = igmp->interface->info; | |
1353 | ||
1354 | lmqc = igmp->querier_robustness_variable; | |
1355 | lmqi_msec = 100 * pim_ifp->igmp_specific_query_max_response_time_dsec; | |
1356 | lmqt_msec = lmqc * lmqi_msec; | |
1357 | ||
1358 | /* | |
1359 | RFC3376: 6.6.3.2. Building and Sending Group and Source Specific | |
1360 | Queries | |
1361 | ||
1362 | (...) for each of the sources in X of group G, with source timer | |
1363 | larger | |
1364 | than LMQT: | |
1365 | o Set number of retransmissions for each source to [Last Member | |
1366 | Query Count]. | |
1367 | o Lower source timer to LMQT. | |
1368 | */ | |
1369 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { | |
1370 | if (IGMP_SOURCE_TEST_SEND(src->source_flags)) { | |
1371 | /* source "src" in X of group G */ | |
1372 | if (igmp_source_timer_remain_msec(src) > lmqt_msec) { | |
1373 | src->source_query_retransmit_count = lmqc; | |
1374 | igmp_source_timer_lower_to_lmqt(src); | |
1375 | } | |
1376 | } | |
1377 | } | |
1378 | ||
1379 | /* send group-and-source specific queries */ | |
1380 | group_retransmit_sources(group, 1 /* send_with_sflag_set=true */); | |
1381 | ||
1382 | /* make sure group retransmit timer is running */ | |
1383 | group_retransmit_timer_on(group); | |
1384 | } | |
1385 | ||
1386 | static void block_excl(struct igmp_group *group, int num_sources, | |
1387 | struct in_addr *sources) | |
1388 | { | |
1389 | int num_sources_tosend = 0; | |
1390 | int i; | |
1391 | ||
1392 | /* 1. clear off SEND flag from all known sources (X,Y) */ | |
1393 | source_clear_send_flag(group->group_source_list); | |
1394 | ||
1395 | /* 2. scan received sources (A) */ | |
1396 | for (i = 0; i < num_sources; ++i) { | |
1397 | struct igmp_source *source; | |
1398 | struct in_addr *src_addr; | |
1399 | ||
1400 | src_addr = sources + i; | |
1401 | ||
1402 | /* lookup reported source (A) in known sources (X,Y) */ | |
1403 | source = igmp_find_source_by_addr(group, *src_addr); | |
1404 | if (!source) { | |
1405 | /* 3: if not found, create source with Group Timer: | |
1406 | * (A-X-Y)=Group Timer */ | |
1407 | long group_timer_msec; | |
1408 | source = source_new(group, *src_addr); | |
1409 | ||
1410 | zassert(!source->t_source_timer); /* timer == 0 */ | |
1411 | group_timer_msec = igmp_group_timer_remain_msec(group); | |
1412 | igmp_source_timer_on(group, source, group_timer_msec); | |
1413 | zassert(source->t_source_timer); /* (A-X-Y) timer > 0 */ | |
1414 | } | |
1415 | ||
1416 | if (source->t_source_timer) { | |
1417 | /* 4. if source timer>0 mark SEND flag: Q(G,A-Y) */ | |
1418 | IGMP_SOURCE_DO_SEND(source->source_flags); | |
1419 | ++num_sources_tosend; | |
1420 | } | |
1421 | } | |
1422 | ||
1423 | /* 5. send sources marked with SEND flag: Q(G,A-Y) */ | |
1424 | if (num_sources_tosend > 0) { | |
1425 | source_query_send_by_flag(group, num_sources_tosend); | |
1426 | } | |
1427 | } | |
1428 | ||
1429 | static void block_incl(struct igmp_group *group, int num_sources, | |
1430 | struct in_addr *sources) | |
1431 | { | |
1432 | int num_sources_tosend = 0; | |
1433 | int i; | |
1434 | ||
1435 | /* 1. clear off SEND flag from all known sources (B) */ | |
1436 | source_clear_send_flag(group->group_source_list); | |
1437 | ||
1438 | /* 2. scan received sources (A) */ | |
1439 | for (i = 0; i < num_sources; ++i) { | |
1440 | struct igmp_source *source; | |
1441 | struct in_addr *src_addr; | |
1442 | ||
1443 | src_addr = sources + i; | |
1444 | ||
1445 | /* lookup reported source (A) in known sources (B) */ | |
1446 | source = igmp_find_source_by_addr(group, *src_addr); | |
1447 | if (source) { | |
1448 | /* 3. if found (A*B), mark SEND flag: Q(G,A*B) */ | |
1449 | IGMP_SOURCE_DO_SEND(source->source_flags); | |
1450 | ++num_sources_tosend; | |
1451 | } | |
1452 | } | |
1453 | ||
1454 | /* 4. send sources marked with SEND flag: Q(G,A*B) */ | |
1455 | if (num_sources_tosend > 0) { | |
1456 | source_query_send_by_flag(group, num_sources_tosend); | |
1457 | } | |
1458 | } | |
1459 | ||
1460 | void igmpv3_report_block(struct igmp_sock *igmp, struct in_addr from, | |
1461 | struct in_addr group_addr, int num_sources, | |
1462 | struct in_addr *sources) | |
1463 | { | |
1464 | struct interface *ifp = igmp->interface; | |
1465 | struct igmp_group *group; | |
1466 | ||
1467 | on_trace(__PRETTY_FUNCTION__, ifp, from, group_addr, num_sources, | |
1468 | sources); | |
1469 | ||
1470 | /* non-existant group is created as INCLUDE {empty} */ | |
1471 | group = igmp_add_group_by_addr(igmp, group_addr); | |
1472 | if (!group) { | |
1473 | return; | |
1474 | } | |
1475 | ||
1476 | if (group->group_filtermode_isexcl) { | |
1477 | /* EXCLUDE mode */ | |
1478 | block_excl(group, num_sources, sources); | |
1479 | } else { | |
1480 | /* INCLUDE mode */ | |
1481 | block_incl(group, num_sources, sources); | |
1482 | } | |
1483 | } | |
1484 | ||
1485 | void igmp_group_timer_lower_to_lmqt(struct igmp_group *group) | |
1486 | { | |
1487 | struct igmp_sock *igmp; | |
1488 | struct interface *ifp; | |
1489 | struct pim_interface *pim_ifp; | |
1490 | char *ifname; | |
1491 | int lmqi_dsec; /* Last Member Query Interval */ | |
1492 | int lmqc; /* Last Member Query Count */ | |
1493 | int lmqt_msec; /* Last Member Query Time */ | |
1494 | ||
1495 | /* | |
1496 | RFC 3376: 6.2.2. Definition of Group Timers | |
1497 | ||
1498 | The group timer is only used when a group is in EXCLUDE mode and | |
1499 | it represents the time for the *filter-mode* of the group to | |
1500 | expire and switch to INCLUDE mode. | |
1501 | */ | |
1502 | if (!group->group_filtermode_isexcl) { | |
1503 | return; | |
1504 | } | |
1505 | ||
1506 | igmp = group->group_igmp_sock; | |
1507 | ifp = igmp->interface; | |
1508 | pim_ifp = ifp->info; | |
1509 | ifname = ifp->name; | |
1510 | ||
1511 | lmqi_dsec = pim_ifp->igmp_specific_query_max_response_time_dsec; | |
1512 | lmqc = igmp->querier_robustness_variable; | |
1513 | lmqt_msec = PIM_IGMP_LMQT_MSEC( | |
1514 | lmqi_dsec, lmqc); /* lmqt_msec = (100 * lmqi_dsec) * lmqc */ | |
1515 | ||
1516 | if (PIM_DEBUG_IGMP_TRACE) { | |
1517 | char group_str[INET_ADDRSTRLEN]; | |
1518 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1519 | sizeof(group_str)); | |
1520 | zlog_debug( | |
1521 | "%s: group %s on %s: LMQC=%d LMQI=%d dsec LMQT=%d msec", | |
1522 | __PRETTY_FUNCTION__, group_str, ifname, lmqc, lmqi_dsec, | |
1523 | lmqt_msec); | |
1524 | } | |
1525 | ||
1526 | zassert(group->group_filtermode_isexcl); | |
1527 | ||
1528 | igmp_group_timer_on(group, lmqt_msec, ifname); | |
1529 | } | |
1530 | ||
1531 | void igmp_source_timer_lower_to_lmqt(struct igmp_source *source) | |
1532 | { | |
1533 | struct igmp_group *group; | |
1534 | struct igmp_sock *igmp; | |
1535 | struct interface *ifp; | |
1536 | struct pim_interface *pim_ifp; | |
1537 | char *ifname; | |
1538 | int lmqi_dsec; /* Last Member Query Interval */ | |
1539 | int lmqc; /* Last Member Query Count */ | |
1540 | int lmqt_msec; /* Last Member Query Time */ | |
1541 | ||
1542 | group = source->source_group; | |
1543 | igmp = group->group_igmp_sock; | |
1544 | ifp = igmp->interface; | |
1545 | pim_ifp = ifp->info; | |
1546 | ifname = ifp->name; | |
1547 | ||
1548 | lmqi_dsec = pim_ifp->igmp_specific_query_max_response_time_dsec; | |
1549 | lmqc = igmp->querier_robustness_variable; | |
1550 | lmqt_msec = PIM_IGMP_LMQT_MSEC( | |
1551 | lmqi_dsec, lmqc); /* lmqt_msec = (100 * lmqi_dsec) * lmqc */ | |
1552 | ||
1553 | if (PIM_DEBUG_IGMP_TRACE) { | |
1554 | char group_str[INET_ADDRSTRLEN]; | |
1555 | char source_str[INET_ADDRSTRLEN]; | |
1556 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1557 | sizeof(group_str)); | |
1558 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
1559 | sizeof(source_str)); | |
1560 | zlog_debug( | |
1561 | "%s: group %s source %s on %s: LMQC=%d LMQI=%d dsec LMQT=%d msec", | |
1562 | __PRETTY_FUNCTION__, group_str, source_str, ifname, | |
1563 | lmqc, lmqi_dsec, lmqt_msec); | |
1564 | } | |
1565 | ||
1566 | igmp_source_timer_on(group, source, lmqt_msec); | |
1567 | } | |
1568 | ||
1569 | void igmp_v3_send_query(struct igmp_group *group, int fd, const char *ifname, | |
1570 | char *query_buf, int query_buf_size, int num_sources, | |
1571 | struct in_addr dst_addr, struct in_addr group_addr, | |
1572 | int query_max_response_time_dsec, uint8_t s_flag, | |
1573 | uint8_t querier_robustness_variable, | |
1574 | uint16_t querier_query_interval) | |
1575 | { | |
1576 | ssize_t msg_size; | |
1577 | uint8_t max_resp_code; | |
1578 | uint8_t qqic; | |
1579 | ssize_t sent; | |
1580 | struct sockaddr_in to; | |
1581 | socklen_t tolen; | |
1582 | uint16_t checksum; | |
1583 | ||
1584 | zassert(num_sources >= 0); | |
1585 | ||
1586 | msg_size = IGMP_V3_SOURCES_OFFSET + (num_sources << 2); | |
1587 | if (msg_size > query_buf_size) { | |
1588 | flog_err( | |
1589 | EC_LIB_DEVELOPMENT, | |
1590 | "%s %s: unable to send: msg_size=%zd larger than query_buf_size=%d", | |
1591 | __FILE__, __PRETTY_FUNCTION__, msg_size, | |
1592 | query_buf_size); | |
1593 | return; | |
1594 | } | |
1595 | ||
1596 | s_flag = PIM_FORCE_BOOLEAN(s_flag); | |
1597 | zassert((s_flag == 0) || (s_flag == 1)); | |
1598 | ||
1599 | max_resp_code = igmp_msg_encode16to8(query_max_response_time_dsec); | |
1600 | qqic = igmp_msg_encode16to8(querier_query_interval); | |
1601 | ||
1602 | /* | |
1603 | RFC 3376: 4.1.6. QRV (Querier's Robustness Variable) | |
1604 | ||
1605 | If non-zero, the QRV field contains the [Robustness Variable] | |
1606 | value used by the querier, i.e., the sender of the Query. If the | |
1607 | querier's [Robustness Variable] exceeds 7, the maximum value of | |
1608 | the QRV field, the QRV is set to zero. | |
1609 | */ | |
1610 | if (querier_robustness_variable > 7) { | |
1611 | querier_robustness_variable = 0; | |
1612 | } | |
1613 | ||
1614 | query_buf[0] = PIM_IGMP_MEMBERSHIP_QUERY; | |
1615 | query_buf[1] = max_resp_code; | |
1616 | *(uint16_t *)(query_buf + IGMP_CHECKSUM_OFFSET) = | |
1617 | 0; /* for computing checksum */ | |
1618 | memcpy(query_buf + 4, &group_addr, sizeof(struct in_addr)); | |
1619 | ||
1620 | query_buf[8] = (s_flag << 3) | querier_robustness_variable; | |
1621 | query_buf[9] = qqic; | |
1622 | *(uint16_t *)(query_buf + IGMP_V3_NUMSOURCES_OFFSET) = | |
1623 | htons(num_sources); | |
1624 | ||
1625 | checksum = in_cksum(query_buf, msg_size); | |
1626 | *(uint16_t *)(query_buf + IGMP_CHECKSUM_OFFSET) = checksum; | |
1627 | ||
1628 | if (PIM_DEBUG_IGMP_PACKETS) { | |
1629 | char dst_str[INET_ADDRSTRLEN]; | |
1630 | char group_str[INET_ADDRSTRLEN]; | |
1631 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
1632 | pim_inet4_dump("<group?>", group_addr, group_str, | |
1633 | sizeof(group_str)); | |
1634 | zlog_debug( | |
1635 | "Send IGMPv3 query to %s on %s for group %s, sources=%d msg_size=%zd s_flag=%x QRV=%u QQI=%u QQIC=%02x", | |
1636 | dst_str, ifname, group_str, num_sources, msg_size, | |
1637 | s_flag, querier_robustness_variable, | |
1638 | querier_query_interval, qqic); | |
1639 | } | |
1640 | ||
1641 | memset(&to, 0, sizeof(to)); | |
1642 | to.sin_family = AF_INET; | |
1643 | to.sin_addr = dst_addr; | |
1644 | tolen = sizeof(to); | |
1645 | ||
1646 | sent = sendto(fd, query_buf, msg_size, MSG_DONTWAIT, | |
1647 | (struct sockaddr *)&to, tolen); | |
1648 | if (sent != (ssize_t)msg_size) { | |
1649 | char dst_str[INET_ADDRSTRLEN]; | |
1650 | char group_str[INET_ADDRSTRLEN]; | |
1651 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
1652 | pim_inet4_dump("<group?>", group_addr, group_str, | |
1653 | sizeof(group_str)); | |
1654 | if (sent < 0) { | |
1655 | zlog_warn( | |
1656 | "Send IGMPv3 query failed due to %s on %s: group=%s msg_size=%zd: errno=%d: %s", | |
1657 | dst_str, ifname, group_str, msg_size, errno, | |
1658 | safe_strerror(errno)); | |
1659 | } else { | |
1660 | zlog_warn( | |
1661 | "Send IGMPv3 query failed due to %s on %s: group=%s msg_size=%zd: sent=%zd", | |
1662 | dst_str, ifname, group_str, msg_size, sent); | |
1663 | } | |
1664 | return; | |
1665 | } | |
1666 | ||
1667 | /* | |
1668 | s_flag sanity test: s_flag must be set for general queries | |
1669 | ||
1670 | RFC 3376: 6.6.1. Timer Updates | |
1671 | ||
1672 | When a router sends or receives a query with a clear Suppress | |
1673 | Router-Side Processing flag, it must update its timers to reflect | |
1674 | the correct timeout values for the group or sources being queried. | |
1675 | ||
1676 | General queries don't trigger timer update. | |
1677 | */ | |
1678 | if (!s_flag) { | |
1679 | /* general query? */ | |
1680 | if (PIM_INADDR_IS_ANY(group_addr)) { | |
1681 | char dst_str[INET_ADDRSTRLEN]; | |
1682 | char group_str[INET_ADDRSTRLEN]; | |
1683 | pim_inet4_dump("<dst?>", dst_addr, dst_str, | |
1684 | sizeof(dst_str)); | |
1685 | pim_inet4_dump("<group?>", group_addr, group_str, | |
1686 | sizeof(group_str)); | |
1687 | zlog_warn( | |
1688 | "%s: to %s on %s: group=%s sources=%d: s_flag is clear for general query!", | |
1689 | __PRETTY_FUNCTION__, dst_str, ifname, group_str, | |
1690 | num_sources); | |
1691 | } | |
1692 | } | |
1693 | } | |
1694 | ||
1695 | void igmp_v3_recv_query(struct igmp_sock *igmp, const char *from_str, | |
1696 | char *igmp_msg) | |
1697 | { | |
1698 | struct interface *ifp; | |
1699 | struct pim_interface *pim_ifp; | |
1700 | struct in_addr group_addr; | |
1701 | uint8_t resv_s_qrv = 0; | |
1702 | uint8_t s_flag = 0; | |
1703 | uint8_t qrv = 0; | |
1704 | int i; | |
1705 | ||
1706 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); | |
1707 | ifp = igmp->interface; | |
1708 | pim_ifp = ifp->info; | |
1709 | ||
1710 | /* | |
1711 | * RFC 3376: 4.1.6. QRV (Querier's Robustness Variable) | |
1712 | * | |
1713 | * Routers adopt the QRV value from the most recently received Query | |
1714 | * as their own [Robustness Variable] value, unless that most | |
1715 | * recently received QRV was zero, in which case the receivers use | |
1716 | * the default [Robustness Variable] value specified in section 8.1 | |
1717 | * or a statically configured value. | |
1718 | */ | |
1719 | resv_s_qrv = igmp_msg[8]; | |
1720 | qrv = 7 & resv_s_qrv; | |
1721 | igmp->querier_robustness_variable = | |
1722 | qrv ? qrv : pim_ifp->igmp_default_robustness_variable; | |
1723 | ||
1724 | /* | |
1725 | * RFC 3376: 4.1.7. QQIC (Querier's Query Interval Code) | |
1726 | * | |
1727 | * Multicast routers that are not the current querier adopt the QQI | |
1728 | * value from the most recently received Query as their own [Query | |
1729 | * Interval] value, unless that most recently received QQI was zero, | |
1730 | * in which case the receiving routers use the default. | |
1731 | */ | |
1732 | if (igmp->t_other_querier_timer) { | |
1733 | /* other querier present */ | |
1734 | uint8_t qqic; | |
1735 | uint16_t qqi; | |
1736 | qqic = igmp_msg[9]; | |
1737 | qqi = igmp_msg_decode8to16(qqic); | |
1738 | igmp->querier_query_interval = | |
1739 | qqi ? qqi : pim_ifp->igmp_default_query_interval; | |
1740 | ||
1741 | if (PIM_DEBUG_IGMP_TRACE) { | |
1742 | char ifaddr_str[INET_ADDRSTRLEN]; | |
1743 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
1744 | sizeof(ifaddr_str)); | |
1745 | zlog_debug( | |
1746 | "Querier %s new query interval is %s QQI=%u sec (recv QQIC=%02x from %s)", | |
1747 | ifaddr_str, | |
1748 | qqi ? "recv-non-default" : "default", | |
1749 | igmp->querier_query_interval, qqic, from_str); | |
1750 | } | |
1751 | } | |
1752 | ||
1753 | /* | |
1754 | * RFC 3376: 6.6.1. Timer Updates | |
1755 | * | |
1756 | * When a router sends or receives a query with a clear Suppress | |
1757 | * Router-Side Processing flag, it must update its timers to reflect | |
1758 | * the correct timeout values for the group or sources being queried. | |
1759 | * | |
1760 | * General queries don't trigger timer update. | |
1761 | */ | |
1762 | s_flag = (1 << 3) & resv_s_qrv; | |
1763 | ||
1764 | if (!s_flag) { | |
1765 | /* s_flag is clear */ | |
1766 | ||
1767 | if (PIM_INADDR_IS_ANY(group_addr)) { | |
1768 | /* this is a general query */ | |
1769 | /* log that general query should have the s_flag set */ | |
1770 | zlog_warn( | |
1771 | "General IGMP query v3 from %s on %s: Suppress Router-Side Processing flag is clear", | |
1772 | from_str, ifp->name); | |
1773 | } else { | |
1774 | struct igmp_group *group; | |
1775 | ||
1776 | /* this is a non-general query: perform timer updates */ | |
1777 | ||
1778 | group = find_group_by_addr(igmp, group_addr); | |
1779 | if (group) { | |
1780 | int recv_num_sources = ntohs(*( | |
1781 | uint16_t | |
1782 | *)(igmp_msg | |
1783 | + IGMP_V3_NUMSOURCES_OFFSET)); | |
1784 | ||
1785 | /* | |
1786 | * RFC 3376: 6.6.1. Timer Updates | |
1787 | * Query Q(G,A): Source Timer for sources in A | |
1788 | * are lowered to LMQT | |
1789 | * Query Q(G): Group Timer is lowered to LMQT | |
1790 | */ | |
1791 | if (recv_num_sources < 1) { | |
1792 | /* Query Q(G): Group Timer is lowered to | |
1793 | * LMQT */ | |
1794 | ||
1795 | igmp_group_timer_lower_to_lmqt(group); | |
1796 | } else { | |
1797 | /* Query Q(G,A): Source Timer for | |
1798 | * sources in A are lowered to LMQT */ | |
1799 | ||
1800 | /* Scan sources in query and lower their | |
1801 | * timers to LMQT */ | |
1802 | struct in_addr *sources = | |
1803 | (struct in_addr | |
1804 | *)(igmp_msg | |
1805 | + IGMP_V3_SOURCES_OFFSET); | |
1806 | for (i = 0; i < recv_num_sources; ++i) { | |
1807 | struct in_addr src_addr; | |
1808 | struct igmp_source *src; | |
1809 | memcpy(&src_addr, sources + i, | |
1810 | sizeof(struct in_addr)); | |
1811 | src = igmp_find_source_by_addr( | |
1812 | group, src_addr); | |
1813 | if (src) { | |
1814 | igmp_source_timer_lower_to_lmqt( | |
1815 | src); | |
1816 | } | |
1817 | } | |
1818 | } | |
1819 | } else { | |
1820 | char group_str[INET_ADDRSTRLEN]; | |
1821 | pim_inet4_dump("<group?>", group_addr, | |
1822 | group_str, sizeof(group_str)); | |
1823 | zlog_warn( | |
1824 | "IGMP query v3 from %s on %s: could not find group %s for timer update", | |
1825 | from_str, ifp->name, group_str); | |
1826 | } | |
1827 | } | |
1828 | } /* s_flag is clear: timer updates */ | |
1829 | } | |
1830 | ||
1831 | int igmp_v3_recv_report(struct igmp_sock *igmp, struct in_addr from, | |
1832 | const char *from_str, char *igmp_msg, int igmp_msg_len) | |
1833 | { | |
1834 | uint16_t recv_checksum; | |
1835 | uint16_t checksum; | |
1836 | int num_groups; | |
1837 | uint8_t *group_record; | |
1838 | uint8_t *report_pastend = (uint8_t *)igmp_msg + igmp_msg_len; | |
1839 | struct interface *ifp = igmp->interface; | |
1840 | int i; | |
1841 | int local_ncb = 0; | |
1842 | struct pim_interface *pim_ifp; | |
1843 | ||
1844 | if (igmp->mtrace_only) | |
1845 | return 0; | |
1846 | ||
1847 | pim_ifp = igmp->interface->info; | |
1848 | ||
1849 | if (igmp_msg_len < IGMP_V3_MSG_MIN_SIZE) { | |
1850 | zlog_warn( | |
1851 | "Recv IGMP report v3 from %s on %s: size=%d shorter than minimum=%d", | |
1852 | from_str, ifp->name, igmp_msg_len, | |
1853 | IGMP_V3_MSG_MIN_SIZE); | |
1854 | return -1; | |
1855 | } | |
1856 | ||
1857 | recv_checksum = *(uint16_t *)(igmp_msg + IGMP_CHECKSUM_OFFSET); | |
1858 | ||
1859 | /* for computing checksum */ | |
1860 | *(uint16_t *)(igmp_msg + IGMP_CHECKSUM_OFFSET) = 0; | |
1861 | ||
1862 | checksum = in_cksum(igmp_msg, igmp_msg_len); | |
1863 | if (checksum != recv_checksum) { | |
1864 | zlog_warn( | |
1865 | "Recv IGMP report v3 from %s on %s: checksum mismatch: received=%x computed=%x", | |
1866 | from_str, ifp->name, recv_checksum, checksum); | |
1867 | return -1; | |
1868 | } | |
1869 | ||
1870 | /* Collecting IGMP Rx stats */ | |
1871 | igmp->rx_stats.report_v3++; | |
1872 | ||
1873 | num_groups = ntohs( | |
1874 | *(uint16_t *)(igmp_msg + IGMP_V3_REPORT_NUMGROUPS_OFFSET)); | |
1875 | if (num_groups < 1) { | |
1876 | zlog_warn( | |
1877 | "Recv IGMP report v3 from %s on %s: missing group records", | |
1878 | from_str, ifp->name); | |
1879 | return -1; | |
1880 | } | |
1881 | ||
1882 | if (PIM_DEBUG_IGMP_PACKETS) { | |
1883 | zlog_debug( | |
1884 | "Recv IGMP report v3 from %s on %s: size=%d checksum=%x groups=%d", | |
1885 | from_str, ifp->name, igmp_msg_len, checksum, | |
1886 | num_groups); | |
1887 | } | |
1888 | ||
1889 | group_record = (uint8_t *)igmp_msg + IGMP_V3_REPORT_GROUPPRECORD_OFFSET; | |
1890 | ||
1891 | /* Scan groups */ | |
1892 | for (i = 0; i < num_groups; ++i) { | |
1893 | struct in_addr rec_group; | |
1894 | uint8_t *sources; | |
1895 | uint8_t *src; | |
1896 | int rec_type; | |
1897 | int rec_auxdatalen; | |
1898 | int rec_num_sources; | |
1899 | int j; | |
1900 | struct prefix lncb; | |
1901 | struct prefix g; | |
1902 | bool filtered = false; | |
1903 | ||
1904 | if ((group_record + IGMP_V3_GROUP_RECORD_MIN_SIZE) | |
1905 | > report_pastend) { | |
1906 | zlog_warn( | |
1907 | "Recv IGMP report v3 from %s on %s: group record beyond report end", | |
1908 | from_str, ifp->name); | |
1909 | return -1; | |
1910 | } | |
1911 | ||
1912 | rec_type = group_record[IGMP_V3_GROUP_RECORD_TYPE_OFFSET]; | |
1913 | rec_auxdatalen = | |
1914 | group_record[IGMP_V3_GROUP_RECORD_AUXDATALEN_OFFSET]; | |
1915 | rec_num_sources = ntohs(*( | |
1916 | uint16_t *)(group_record | |
1917 | + IGMP_V3_GROUP_RECORD_NUMSOURCES_OFFSET)); | |
1918 | ||
1919 | memcpy(&rec_group, | |
1920 | group_record + IGMP_V3_GROUP_RECORD_GROUP_OFFSET, | |
1921 | sizeof(struct in_addr)); | |
1922 | ||
1923 | if (PIM_DEBUG_IGMP_PACKETS) { | |
1924 | zlog_debug( | |
1925 | "Recv IGMP report v3 from %s on %s: record=%d type=%d auxdatalen=%d sources=%d group=%s", | |
1926 | from_str, ifp->name, i, rec_type, | |
1927 | rec_auxdatalen, rec_num_sources, | |
1928 | inet_ntoa(rec_group)); | |
1929 | } | |
1930 | ||
1931 | /* Scan sources */ | |
1932 | ||
1933 | sources = group_record + IGMP_V3_GROUP_RECORD_SOURCE_OFFSET; | |
1934 | ||
1935 | for (j = 0, src = sources; j < rec_num_sources; ++j, src += 4) { | |
1936 | ||
1937 | if ((src + 4) > report_pastend) { | |
1938 | zlog_warn( | |
1939 | "Recv IGMP report v3 from %s on %s: group source beyond report end", | |
1940 | from_str, ifp->name); | |
1941 | return -1; | |
1942 | } | |
1943 | ||
1944 | if (PIM_DEBUG_IGMP_PACKETS) { | |
1945 | char src_str[200]; | |
1946 | ||
1947 | if (!inet_ntop(AF_INET, src, src_str, | |
1948 | sizeof(src_str))) | |
1949 | sprintf(src_str, "<source?>"); | |
1950 | ||
1951 | zlog_debug( | |
1952 | "Recv IGMP report v3 from %s on %s: record=%d group=%s source=%s", | |
1953 | from_str, ifp->name, i, | |
1954 | inet_ntoa(rec_group), src_str); | |
1955 | } | |
1956 | } /* for (sources) */ | |
1957 | ||
1958 | ||
1959 | lncb.family = AF_INET; | |
1960 | lncb.u.prefix4.s_addr = 0x000000E0; | |
1961 | lncb.prefixlen = 24; | |
1962 | ||
1963 | g.family = AF_INET; | |
1964 | g.u.prefix4 = rec_group; | |
1965 | g.prefixlen = 32; | |
1966 | ||
1967 | /* determine filtering status for group */ | |
1968 | filtered = pim_is_group_filtered(ifp->info, &rec_group); | |
1969 | ||
1970 | if (PIM_DEBUG_IGMP_PACKETS && filtered) | |
1971 | zlog_debug( | |
1972 | "Filtering IGMPv3 group record %s from %s on %s per prefix-list %s", | |
1973 | inet_ntoa(rec_group), from_str, ifp->name, | |
1974 | pim_ifp->boundary_oil_plist); | |
1975 | ||
1976 | /* | |
1977 | * If we receive a igmp report with the group in 224.0.0.0/24 | |
1978 | * then we should ignore it | |
1979 | */ | |
1980 | if (prefix_match(&lncb, &g)) | |
1981 | local_ncb = 1; | |
1982 | ||
1983 | if (!local_ncb && !filtered) | |
1984 | switch (rec_type) { | |
1985 | case IGMP_GRP_REC_TYPE_MODE_IS_INCLUDE: | |
1986 | igmpv3_report_isin(igmp, from, rec_group, | |
1987 | rec_num_sources, | |
1988 | (struct in_addr *)sources); | |
1989 | break; | |
1990 | case IGMP_GRP_REC_TYPE_MODE_IS_EXCLUDE: | |
1991 | igmpv3_report_isex( | |
1992 | igmp, from, rec_group, rec_num_sources, | |
1993 | (struct in_addr *)sources, 0); | |
1994 | break; | |
1995 | case IGMP_GRP_REC_TYPE_CHANGE_TO_INCLUDE_MODE: | |
1996 | igmpv3_report_toin(igmp, from, rec_group, | |
1997 | rec_num_sources, | |
1998 | (struct in_addr *)sources); | |
1999 | break; | |
2000 | case IGMP_GRP_REC_TYPE_CHANGE_TO_EXCLUDE_MODE: | |
2001 | igmpv3_report_toex(igmp, from, rec_group, | |
2002 | rec_num_sources, | |
2003 | (struct in_addr *)sources); | |
2004 | break; | |
2005 | case IGMP_GRP_REC_TYPE_ALLOW_NEW_SOURCES: | |
2006 | igmpv3_report_allow(igmp, from, rec_group, | |
2007 | rec_num_sources, | |
2008 | (struct in_addr *)sources); | |
2009 | break; | |
2010 | case IGMP_GRP_REC_TYPE_BLOCK_OLD_SOURCES: | |
2011 | igmpv3_report_block(igmp, from, rec_group, | |
2012 | rec_num_sources, | |
2013 | (struct in_addr *)sources); | |
2014 | break; | |
2015 | default: | |
2016 | zlog_warn( | |
2017 | "Recv IGMP report v3 from %s on %s: unknown record type: type=%d", | |
2018 | from_str, ifp->name, rec_type); | |
2019 | } | |
2020 | ||
2021 | group_record += | |
2022 | 8 + (rec_num_sources << 2) + (rec_auxdatalen << 2); | |
2023 | local_ncb = 0; | |
2024 | ||
2025 | } /* for (group records) */ | |
2026 | ||
2027 | return 0; | |
2028 | } |