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12e41d03 DL |
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. | |
ac4d0be5 | 14 | |
12e41d03 DL |
15 | You should have received a copy of the GNU General Public License |
16 | along with this program; see the file COPYING; if not, write to the | |
17 | Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |
18 | MA 02110-1301 USA | |
12e41d03 DL |
19 | */ |
20 | ||
21 | #include <zebra.h> | |
22 | #include "log.h" | |
23 | #include "memory.h" | |
744d91b3 | 24 | #include "if.h" |
12e41d03 DL |
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 | ||
ac4d0be5 | 43 | static void on_trace(const char *label, struct interface *ifp, |
44 | struct in_addr from, struct in_addr group_addr, | |
12e41d03 DL |
45 | int num_sources, struct in_addr *sources) |
46 | { | |
ac4d0be5 | 47 | if (PIM_DEBUG_IGMP_TRACE) { |
48 | char from_str[INET_ADDRSTRLEN]; | |
49 | char group_str[INET_ADDRSTRLEN]; | |
12e41d03 | 50 | |
ac4d0be5 | 51 | pim_inet4_dump("<from?>", from, from_str, sizeof(from_str)); |
52 | pim_inet4_dump("<group?>", group_addr, group_str, | |
53 | sizeof(group_str)); | |
12e41d03 | 54 | |
ac4d0be5 | 55 | zlog_debug("%s: from %s on %s: group=%s sources=%d", label, |
56 | from_str, ifp->name, group_str, num_sources); | |
57 | } | |
12e41d03 DL |
58 | } |
59 | ||
12e41d03 DL |
60 | void igmp_group_reset_gmi(struct igmp_group *group) |
61 | { | |
ac4d0be5 | 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); | |
12e41d03 DL |
109 | } |
110 | ||
111 | static int igmp_source_timer(struct thread *t) | |
112 | { | |
ac4d0be5 | 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 | zassert(source->t_source_timer); | |
134 | source->t_source_timer = NULL; | |
135 | ||
136 | /* | |
137 | RFC 3376: 6.3. IGMPv3 Source-Specific Forwarding Rules | |
138 | ||
139 | Group | |
140 | Filter-Mode Source Timer Value Action | |
141 | ----------- ------------------ ------ | |
142 | INCLUDE TIMER == 0 Suggest to stop forwarding | |
143 | traffic from source and | |
144 | remove source record. If | |
145 | there are no more source | |
146 | records for the group, delete | |
147 | group record. | |
148 | ||
149 | EXCLUDE TIMER == 0 Suggest to not forward | |
150 | traffic from source | |
151 | (DO NOT remove record) | |
152 | ||
153 | Source timer switched from (T > 0) to (T == 0): disable forwarding. | |
154 | */ | |
155 | ||
156 | zassert(!source->t_source_timer); | |
157 | ||
158 | if (group->group_filtermode_isexcl) { | |
159 | /* EXCLUDE mode */ | |
160 | ||
161 | igmp_source_forward_stop(source); | |
162 | } else { | |
163 | /* INCLUDE mode */ | |
164 | ||
165 | /* igmp_source_delete() will stop forwarding source */ | |
166 | igmp_source_delete(source); | |
167 | ||
168 | /* | |
169 | If there are no more source records for the group, delete | |
170 | group | |
171 | record. | |
172 | */ | |
173 | if (!listcount(group->group_source_list)) { | |
174 | igmp_group_delete_empty_include(group); | |
175 | } | |
176 | } | |
177 | ||
178 | return 0; | |
12e41d03 DL |
179 | } |
180 | ||
181 | static void source_timer_off(struct igmp_group *group, | |
182 | struct igmp_source *source) | |
183 | { | |
ac4d0be5 | 184 | if (!source->t_source_timer) |
185 | return; | |
186 | ||
187 | if (PIM_DEBUG_IGMP_TRACE) { | |
188 | char group_str[INET_ADDRSTRLEN]; | |
189 | char source_str[INET_ADDRSTRLEN]; | |
190 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
191 | sizeof(group_str)); | |
192 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
193 | sizeof(source_str)); | |
194 | zlog_debug( | |
195 | "Cancelling TIMER event for group %s source %s on %s", | |
196 | group_str, source_str, | |
197 | group->group_igmp_sock->interface->name); | |
198 | } | |
199 | ||
200 | THREAD_OFF(source->t_source_timer); | |
201 | zassert(!source->t_source_timer); | |
12e41d03 DL |
202 | } |
203 | ||
204 | static void igmp_source_timer_on(struct igmp_group *group, | |
ac4d0be5 | 205 | struct igmp_source *source, long interval_msec) |
12e41d03 | 206 | { |
ac4d0be5 | 207 | source_timer_off(group, source); |
208 | ||
209 | if (PIM_DEBUG_IGMP_EVENTS) { | |
210 | char group_str[INET_ADDRSTRLEN]; | |
211 | char source_str[INET_ADDRSTRLEN]; | |
212 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
213 | sizeof(group_str)); | |
214 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
215 | sizeof(source_str)); | |
216 | zlog_debug( | |
217 | "Scheduling %ld.%03ld sec TIMER event for group %s source %s on %s", | |
218 | interval_msec / 1000, interval_msec % 1000, group_str, | |
219 | source_str, group->group_igmp_sock->interface->name); | |
220 | } | |
221 | ||
222 | THREAD_TIMER_MSEC_ON(master, source->t_source_timer, igmp_source_timer, | |
223 | source, interval_msec); | |
224 | zassert(source->t_source_timer); | |
225 | ||
226 | /* | |
227 | RFC 3376: 6.3. IGMPv3 Source-Specific Forwarding Rules | |
228 | ||
229 | Source timer switched from (T == 0) to (T > 0): enable forwarding. | |
230 | */ | |
231 | igmp_source_forward_start(source); | |
12e41d03 DL |
232 | } |
233 | ||
ac4d0be5 | 234 | void igmp_source_reset_gmi(struct igmp_sock *igmp, struct igmp_group *group, |
12e41d03 DL |
235 | struct igmp_source *source) |
236 | { | |
ac4d0be5 | 237 | long group_membership_interval_msec; |
238 | struct pim_interface *pim_ifp; | |
239 | struct interface *ifp; | |
240 | ||
241 | ifp = igmp->interface; | |
242 | pim_ifp = ifp->info; | |
243 | ||
244 | group_membership_interval_msec = PIM_IGMP_GMI_MSEC( | |
245 | igmp->querier_robustness_variable, igmp->querier_query_interval, | |
246 | pim_ifp->igmp_query_max_response_time_dsec); | |
247 | ||
248 | if (PIM_DEBUG_IGMP_TRACE) { | |
249 | char group_str[INET_ADDRSTRLEN]; | |
250 | char source_str[INET_ADDRSTRLEN]; | |
251 | ||
252 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
253 | sizeof(group_str)); | |
254 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
255 | sizeof(source_str)); | |
256 | ||
257 | zlog_debug( | |
258 | "Resetting source %s timer to GMI=%ld.%03ld sec for group %s on %s", | |
259 | source_str, group_membership_interval_msec / 1000, | |
260 | group_membership_interval_msec % 1000, group_str, | |
261 | ifp->name); | |
262 | } | |
263 | ||
264 | igmp_source_timer_on(group, source, group_membership_interval_msec); | |
12e41d03 DL |
265 | } |
266 | ||
d2ccd60b | 267 | static void source_mark_delete_flag(struct igmp_group *group) |
12e41d03 | 268 | { |
ac4d0be5 | 269 | struct listnode *src_node; |
270 | struct igmp_source *src; | |
12e41d03 | 271 | |
ac4d0be5 | 272 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { |
273 | IGMP_SOURCE_DO_DELETE(src->source_flags); | |
274 | } | |
12e41d03 DL |
275 | } |
276 | ||
ac4d0be5 | 277 | static void source_mark_send_flag(struct igmp_group *group) |
12e41d03 | 278 | { |
ac4d0be5 | 279 | struct listnode *src_node; |
280 | struct igmp_source *src; | |
12e41d03 | 281 | |
ac4d0be5 | 282 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { |
283 | IGMP_SOURCE_DO_SEND(src->source_flags); | |
284 | } | |
12e41d03 DL |
285 | } |
286 | ||
ac4d0be5 | 287 | static int source_mark_send_flag_by_timer(struct igmp_group *group) |
12e41d03 | 288 | { |
ac4d0be5 | 289 | struct listnode *src_node; |
290 | struct igmp_source *src; | |
291 | int num_marked_sources = 0; | |
292 | ||
293 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { | |
294 | /* Is source timer running? */ | |
295 | if (src->t_source_timer) { | |
296 | IGMP_SOURCE_DO_SEND(src->source_flags); | |
297 | ++num_marked_sources; | |
298 | } else { | |
299 | IGMP_SOURCE_DONT_SEND(src->source_flags); | |
300 | } | |
301 | } | |
302 | ||
303 | return num_marked_sources; | |
12e41d03 DL |
304 | } |
305 | ||
306 | static void source_clear_send_flag(struct list *source_list) | |
307 | { | |
ac4d0be5 | 308 | struct listnode *src_node; |
309 | struct igmp_source *src; | |
12e41d03 | 310 | |
ac4d0be5 | 311 | for (ALL_LIST_ELEMENTS_RO(source_list, src_node, src)) { |
312 | IGMP_SOURCE_DONT_SEND(src->source_flags); | |
313 | } | |
12e41d03 DL |
314 | } |
315 | ||
316 | /* | |
317 | Any source (*,G) is forwarded only if mode is EXCLUDE {empty} | |
318 | */ | |
319 | static void group_exclude_fwd_anysrc_ifempty(struct igmp_group *group) | |
320 | { | |
ac4d0be5 | 321 | zassert(group->group_filtermode_isexcl); |
12e41d03 | 322 | |
ac4d0be5 | 323 | if (listcount(group->group_source_list) < 1) { |
324 | igmp_anysource_forward_start(group); | |
325 | } | |
12e41d03 DL |
326 | } |
327 | ||
328 | void igmp_source_free(struct igmp_source *source) | |
329 | { | |
ac4d0be5 | 330 | /* make sure there is no source timer running */ |
331 | zassert(!source->t_source_timer); | |
12e41d03 | 332 | |
ac4d0be5 | 333 | XFREE(MTYPE_PIM_IGMP_GROUP_SOURCE, source); |
12e41d03 DL |
334 | } |
335 | ||
336 | static void source_channel_oil_detach(struct igmp_source *source) | |
337 | { | |
ac4d0be5 | 338 | if (source->source_channel_oil) { |
339 | pim_channel_oil_del(source->source_channel_oil); | |
340 | source->source_channel_oil = NULL; | |
341 | } | |
12e41d03 DL |
342 | } |
343 | ||
344 | /* | |
345 | igmp_source_delete: stop fowarding, and delete the source | |
346 | igmp_source_forward_stop: stop fowarding, but keep the source | |
347 | */ | |
348 | void igmp_source_delete(struct igmp_source *source) | |
349 | { | |
ac4d0be5 | 350 | struct igmp_group *group; |
351 | struct in_addr src; | |
352 | ||
353 | group = source->source_group; | |
354 | ||
355 | if (PIM_DEBUG_IGMP_TRACE) { | |
356 | char group_str[INET_ADDRSTRLEN]; | |
357 | char source_str[INET_ADDRSTRLEN]; | |
358 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
359 | sizeof(group_str)); | |
360 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
361 | sizeof(source_str)); | |
362 | zlog_debug( | |
363 | "Deleting IGMP source %s for group %s from socket %d interface %s c_oil ref_count %d", | |
364 | source_str, group_str, group->group_igmp_sock->fd, | |
365 | group->group_igmp_sock->interface->name, | |
366 | source->source_channel_oil | |
367 | ? source->source_channel_oil->oil_ref_count | |
368 | : 0); | |
369 | } | |
370 | ||
371 | source_timer_off(group, source); | |
372 | igmp_source_forward_stop(source); | |
373 | ||
374 | /* sanity check that forwarding has been disabled */ | |
375 | if (IGMP_SOURCE_TEST_FORWARDING(source->source_flags)) { | |
376 | char group_str[INET_ADDRSTRLEN]; | |
377 | char source_str[INET_ADDRSTRLEN]; | |
378 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
379 | sizeof(group_str)); | |
380 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
381 | sizeof(source_str)); | |
382 | zlog_warn( | |
383 | "%s: forwarding=ON(!) IGMP source %s for group %s from socket %d interface %s", | |
384 | __PRETTY_FUNCTION__, source_str, group_str, | |
385 | group->group_igmp_sock->fd, | |
386 | group->group_igmp_sock->interface->name); | |
387 | /* warning only */ | |
388 | } | |
389 | ||
390 | source_channel_oil_detach(source); | |
391 | ||
392 | /* | |
393 | notice that listnode_delete() can't be moved | |
394 | into igmp_source_free() because the later is | |
395 | called by list_delete_all_node() | |
396 | */ | |
397 | listnode_delete(group->group_source_list, source); | |
398 | ||
399 | src.s_addr = source->source_addr.s_addr; | |
400 | igmp_source_free(source); | |
401 | ||
402 | /* Group source list is empty and current source is * then | |
403 | *,G group going away so do not trigger start */ | |
404 | if (group->group_filtermode_isexcl | |
405 | && (listcount(group->group_source_list) != 0) | |
406 | && src.s_addr != INADDR_ANY) { | |
407 | group_exclude_fwd_anysrc_ifempty(group); | |
408 | } | |
12e41d03 DL |
409 | } |
410 | ||
411 | static void source_delete_by_flag(struct list *source_list) | |
412 | { | |
ac4d0be5 | 413 | struct listnode *src_node; |
414 | struct listnode *src_nextnode; | |
415 | struct igmp_source *src; | |
416 | ||
417 | for (ALL_LIST_ELEMENTS(source_list, src_node, src_nextnode, src)) | |
418 | if (IGMP_SOURCE_TEST_DELETE(src->source_flags)) | |
419 | igmp_source_delete(src); | |
12e41d03 DL |
420 | } |
421 | ||
422 | void igmp_source_delete_expired(struct list *source_list) | |
423 | { | |
ac4d0be5 | 424 | struct listnode *src_node; |
425 | struct listnode *src_nextnode; | |
426 | struct igmp_source *src; | |
427 | ||
428 | for (ALL_LIST_ELEMENTS(source_list, src_node, src_nextnode, src)) | |
429 | if (!src->t_source_timer) | |
430 | igmp_source_delete(src); | |
12e41d03 DL |
431 | } |
432 | ||
433 | struct igmp_source *igmp_find_source_by_addr(struct igmp_group *group, | |
434 | struct in_addr src_addr) | |
435 | { | |
ac4d0be5 | 436 | struct listnode *src_node; |
437 | struct igmp_source *src; | |
12e41d03 | 438 | |
ac4d0be5 | 439 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) |
440 | if (src_addr.s_addr == src->source_addr.s_addr) | |
441 | return src; | |
12e41d03 | 442 | |
ac4d0be5 | 443 | return 0; |
12e41d03 DL |
444 | } |
445 | ||
ac4d0be5 | 446 | struct igmp_source *source_new(struct igmp_group *group, |
447 | struct in_addr src_addr) | |
12e41d03 | 448 | { |
ac4d0be5 | 449 | struct igmp_source *src; |
450 | ||
451 | if (PIM_DEBUG_IGMP_TRACE) { | |
452 | char group_str[INET_ADDRSTRLEN]; | |
453 | char source_str[INET_ADDRSTRLEN]; | |
454 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
455 | sizeof(group_str)); | |
456 | pim_inet4_dump("<source?>", src_addr, source_str, | |
457 | sizeof(source_str)); | |
458 | zlog_debug( | |
459 | "Creating new IGMP source %s for group %s on socket %d interface %s", | |
460 | source_str, group_str, group->group_igmp_sock->fd, | |
461 | group->group_igmp_sock->interface->name); | |
462 | } | |
463 | ||
464 | src = XCALLOC(MTYPE_PIM_IGMP_GROUP_SOURCE, sizeof(*src)); | |
465 | if (!src) { | |
466 | zlog_warn("%s %s: XCALLOC() failure", __FILE__, | |
467 | __PRETTY_FUNCTION__); | |
468 | return 0; /* error, not found, could not create */ | |
469 | } | |
470 | ||
471 | src->t_source_timer = NULL; | |
472 | src->source_group = group; /* back pointer */ | |
473 | src->source_addr = src_addr; | |
474 | src->source_creation = pim_time_monotonic_sec(); | |
475 | src->source_flags = 0; | |
476 | src->source_query_retransmit_count = 0; | |
477 | src->source_channel_oil = NULL; | |
478 | ||
479 | listnode_add(group->group_source_list, src); | |
480 | ||
481 | zassert(!src->t_source_timer); /* source timer == 0 */ | |
482 | ||
483 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
484 | igmp_anysource_forward_stop(group); | |
485 | ||
486 | return src; | |
12e41d03 DL |
487 | } |
488 | ||
489 | static struct igmp_source *add_source_by_addr(struct igmp_sock *igmp, | |
490 | struct igmp_group *group, | |
9bd7302f | 491 | struct in_addr src_addr) |
12e41d03 | 492 | { |
ac4d0be5 | 493 | struct igmp_source *src; |
12e41d03 | 494 | |
ac4d0be5 | 495 | src = igmp_find_source_by_addr(group, src_addr); |
496 | if (src) { | |
497 | return src; | |
498 | } | |
12e41d03 | 499 | |
ac4d0be5 | 500 | src = source_new(group, src_addr); |
501 | if (!src) { | |
502 | return 0; | |
503 | } | |
12e41d03 | 504 | |
ac4d0be5 | 505 | return src; |
12e41d03 DL |
506 | } |
507 | ||
508 | static void allow(struct igmp_sock *igmp, struct in_addr from, | |
ac4d0be5 | 509 | struct in_addr group_addr, int num_sources, |
510 | struct in_addr *sources) | |
12e41d03 | 511 | { |
ac4d0be5 | 512 | struct igmp_source *source; |
513 | struct igmp_group *group; | |
514 | int i; | |
515 | ||
516 | /* non-existant group is created as INCLUDE {empty} */ | |
517 | group = igmp_add_group_by_addr(igmp, group_addr); | |
518 | if (!group) { | |
519 | return; | |
520 | } | |
521 | ||
522 | /* scan received sources */ | |
523 | for (i = 0; i < num_sources; ++i) { | |
524 | struct in_addr *src_addr; | |
525 | ||
526 | src_addr = sources + i; | |
527 | ||
528 | source = add_source_by_addr(igmp, group, *src_addr); | |
529 | if (!source) { | |
530 | continue; | |
531 | } | |
532 | ||
533 | /* | |
534 | RFC 3376: 6.4.1. Reception of Current-State Records | |
535 | ||
536 | When receiving IS_IN reports for groups in EXCLUDE mode is | |
537 | sources should be moved from set with (timers = 0) to set with | |
538 | (timers > 0). | |
539 | ||
540 | igmp_source_reset_gmi() below, resetting the source timers to | |
541 | GMI, accomplishes this. | |
542 | */ | |
543 | igmp_source_reset_gmi(igmp, group, source); | |
544 | ||
545 | } /* scan received sources */ | |
546 | ||
547 | if ((num_sources == 0) && (group->group_filtermode_isexcl) | |
548 | && (listcount(group->group_source_list) == 1)) { | |
549 | struct in_addr star = {.s_addr = INADDR_ANY}; | |
550 | ||
551 | source = igmp_find_source_by_addr(group, star); | |
552 | if (source) | |
553 | igmp_source_reset_gmi(igmp, group, source); | |
554 | } | |
12e41d03 DL |
555 | } |
556 | ||
557 | void igmpv3_report_isin(struct igmp_sock *igmp, struct in_addr from, | |
ac4d0be5 | 558 | struct in_addr group_addr, int num_sources, |
559 | struct in_addr *sources) | |
12e41d03 | 560 | { |
ac4d0be5 | 561 | on_trace(__PRETTY_FUNCTION__, igmp->interface, from, group_addr, |
562 | num_sources, sources); | |
12e41d03 | 563 | |
ac4d0be5 | 564 | allow(igmp, from, group_addr, num_sources, sources); |
12e41d03 DL |
565 | } |
566 | ||
ac4d0be5 | 567 | static void isex_excl(struct igmp_group *group, int num_sources, |
568 | struct in_addr *sources) | |
12e41d03 | 569 | { |
ac4d0be5 | 570 | struct igmp_source *source; |
571 | int i; | |
572 | ||
573 | /* EXCLUDE mode */ | |
574 | zassert(group->group_filtermode_isexcl); | |
575 | ||
576 | /* E.1: set deletion flag for known sources (X,Y) */ | |
577 | source_mark_delete_flag(group); | |
578 | ||
579 | /* scan received sources (A) */ | |
580 | for (i = 0; i < num_sources; ++i) { | |
581 | struct in_addr *src_addr; | |
582 | ||
583 | src_addr = sources + i; | |
584 | ||
585 | /* E.2: lookup reported source from (A) in (X,Y) */ | |
586 | source = igmp_find_source_by_addr(group, *src_addr); | |
587 | if (source) { | |
588 | /* E.3: if found, clear deletion flag: (X*A) or (Y*A) */ | |
589 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
590 | } else { | |
591 | /* E.4: if not found, create source with timer=GMI: | |
592 | * (A-X-Y) */ | |
593 | source = source_new(group, *src_addr); | |
594 | if (!source) { | |
595 | /* ugh, internal malloc failure, skip source */ | |
596 | continue; | |
597 | } | |
598 | zassert(!source->t_source_timer); /* timer == 0 */ | |
599 | igmp_source_reset_gmi(group->group_igmp_sock, group, | |
600 | source); | |
601 | zassert(source->t_source_timer); /* (A-X-Y) timer > 0 */ | |
602 | } | |
603 | ||
604 | } /* scan received sources */ | |
605 | ||
606 | /* | |
607 | * If we are in isexcl mode and num_sources == 0 | |
608 | * than that means we have a *,g entry that | |
609 | * needs to be handled | |
610 | */ | |
611 | if (group->group_filtermode_isexcl && num_sources == 0) { | |
612 | struct in_addr star = {.s_addr = INADDR_ANY}; | |
613 | source = igmp_find_source_by_addr(group, star); | |
614 | if (source) { | |
615 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
616 | igmp_source_reset_gmi(group->group_igmp_sock, group, | |
617 | source); | |
618 | } | |
619 | } | |
620 | ||
621 | /* E.5: delete all sources marked with deletion flag: (X-A) and (Y-A) */ | |
622 | source_delete_by_flag(group->group_source_list); | |
12e41d03 DL |
623 | } |
624 | ||
ac4d0be5 | 625 | static void isex_incl(struct igmp_group *group, int num_sources, |
626 | struct in_addr *sources) | |
12e41d03 | 627 | { |
ac4d0be5 | 628 | int i; |
629 | ||
630 | /* INCLUDE mode */ | |
631 | zassert(!group->group_filtermode_isexcl); | |
632 | ||
633 | /* I.1: set deletion flag for known sources (A) */ | |
634 | source_mark_delete_flag(group); | |
635 | ||
636 | /* scan received sources (B) */ | |
637 | for (i = 0; i < num_sources; ++i) { | |
638 | struct igmp_source *source; | |
639 | struct in_addr *src_addr; | |
640 | ||
641 | src_addr = sources + i; | |
642 | ||
643 | /* I.2: lookup reported source (B) */ | |
644 | source = igmp_find_source_by_addr(group, *src_addr); | |
645 | if (source) { | |
646 | /* I.3: if found, clear deletion flag (A*B) */ | |
647 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
648 | } else { | |
649 | /* I.4: if not found, create source with timer=0 (B-A) | |
650 | */ | |
651 | source = source_new(group, *src_addr); | |
652 | if (!source) { | |
653 | /* ugh, internal malloc failure, skip source */ | |
654 | continue; | |
655 | } | |
656 | zassert(!source->t_source_timer); /* (B-A) timer=0 */ | |
657 | } | |
658 | ||
659 | } /* scan received sources */ | |
660 | ||
661 | /* I.5: delete all sources marked with deletion flag (A-B) */ | |
662 | source_delete_by_flag(group->group_source_list); | |
663 | ||
664 | group->group_filtermode_isexcl = 1; /* boolean=true */ | |
665 | ||
666 | zassert(group->group_filtermode_isexcl); | |
667 | ||
668 | group_exclude_fwd_anysrc_ifempty(group); | |
12e41d03 DL |
669 | } |
670 | ||
671 | void igmpv3_report_isex(struct igmp_sock *igmp, struct in_addr from, | |
ac4d0be5 | 672 | struct in_addr group_addr, int num_sources, |
673 | struct in_addr *sources, int from_igmp_v2_report) | |
12e41d03 | 674 | { |
ac4d0be5 | 675 | struct interface *ifp = igmp->interface; |
676 | struct igmp_group *group; | |
677 | ||
678 | on_trace(__PRETTY_FUNCTION__, ifp, from, group_addr, num_sources, | |
679 | sources); | |
680 | ||
681 | /* non-existant group is created as INCLUDE {empty} */ | |
682 | group = igmp_add_group_by_addr(igmp, group_addr); | |
683 | if (!group) { | |
684 | return; | |
685 | } | |
686 | ||
687 | /* So we can display how we learned the group in our show command output | |
688 | */ | |
689 | if (from_igmp_v2_report) | |
690 | group->igmp_version = 2; | |
691 | ||
692 | if (group->group_filtermode_isexcl) { | |
693 | /* EXCLUDE mode */ | |
694 | isex_excl(group, num_sources, sources); | |
695 | } else { | |
696 | /* INCLUDE mode */ | |
697 | isex_incl(group, num_sources, sources); | |
698 | zassert(group->group_filtermode_isexcl); | |
699 | } | |
700 | ||
701 | zassert(group->group_filtermode_isexcl); | |
702 | ||
703 | igmp_group_reset_gmi(group); | |
12e41d03 DL |
704 | } |
705 | ||
ac4d0be5 | 706 | static void toin_incl(struct igmp_group *group, int num_sources, |
707 | struct in_addr *sources) | |
12e41d03 | 708 | { |
ac4d0be5 | 709 | struct igmp_sock *igmp = group->group_igmp_sock; |
710 | int num_sources_tosend = listcount(group->group_source_list); | |
711 | int i; | |
712 | ||
713 | /* Set SEND flag for all known sources (A) */ | |
714 | source_mark_send_flag(group); | |
715 | ||
716 | /* Scan received sources (B) */ | |
717 | for (i = 0; i < num_sources; ++i) { | |
718 | struct igmp_source *source; | |
719 | struct in_addr *src_addr; | |
720 | ||
721 | src_addr = sources + i; | |
722 | ||
723 | /* Lookup reported source (B) */ | |
724 | source = igmp_find_source_by_addr(group, *src_addr); | |
725 | if (source) { | |
726 | /* If found, clear SEND flag (A*B) */ | |
727 | IGMP_SOURCE_DONT_SEND(source->source_flags); | |
728 | --num_sources_tosend; | |
729 | } else { | |
730 | /* If not found, create new source */ | |
731 | source = source_new(group, *src_addr); | |
732 | if (!source) { | |
733 | /* ugh, internal malloc failure, skip source */ | |
734 | continue; | |
735 | } | |
736 | } | |
737 | ||
738 | /* (B)=GMI */ | |
739 | igmp_source_reset_gmi(igmp, group, source); | |
740 | } | |
741 | ||
742 | /* Send sources marked with SEND flag: Q(G,A-B) */ | |
743 | if (num_sources_tosend > 0) { | |
744 | source_query_send_by_flag(group, num_sources_tosend); | |
745 | } | |
12e41d03 DL |
746 | } |
747 | ||
ac4d0be5 | 748 | static void toin_excl(struct igmp_group *group, int num_sources, |
749 | struct in_addr *sources) | |
12e41d03 | 750 | { |
ac4d0be5 | 751 | struct igmp_sock *igmp = group->group_igmp_sock; |
752 | int num_sources_tosend; | |
753 | int i; | |
754 | ||
755 | /* Set SEND flag for X (sources with timer > 0) */ | |
756 | num_sources_tosend = source_mark_send_flag_by_timer(group); | |
757 | ||
758 | /* Scan received sources (A) */ | |
759 | for (i = 0; i < num_sources; ++i) { | |
760 | struct igmp_source *source; | |
761 | struct in_addr *src_addr; | |
762 | ||
763 | src_addr = sources + i; | |
764 | ||
765 | /* Lookup reported source (A) */ | |
766 | source = igmp_find_source_by_addr(group, *src_addr); | |
767 | if (source) { | |
768 | if (source->t_source_timer) { | |
769 | /* If found and timer running, clear SEND flag | |
770 | * (X*A) */ | |
771 | IGMP_SOURCE_DONT_SEND(source->source_flags); | |
772 | --num_sources_tosend; | |
773 | } | |
774 | } else { | |
775 | /* If not found, create new source */ | |
776 | source = source_new(group, *src_addr); | |
777 | if (!source) { | |
778 | /* ugh, internal malloc failure, skip source */ | |
779 | continue; | |
780 | } | |
781 | } | |
782 | ||
783 | /* (A)=GMI */ | |
784 | igmp_source_reset_gmi(igmp, group, source); | |
785 | } | |
786 | ||
787 | /* Send sources marked with SEND flag: Q(G,X-A) */ | |
788 | if (num_sources_tosend > 0) { | |
789 | source_query_send_by_flag(group, num_sources_tosend); | |
790 | } | |
791 | ||
792 | /* Send Q(G) */ | |
793 | group_query_send(group); | |
12e41d03 DL |
794 | } |
795 | ||
796 | void igmpv3_report_toin(struct igmp_sock *igmp, struct in_addr from, | |
ac4d0be5 | 797 | struct in_addr group_addr, int num_sources, |
798 | struct in_addr *sources) | |
12e41d03 | 799 | { |
ac4d0be5 | 800 | struct interface *ifp = igmp->interface; |
801 | struct igmp_group *group; | |
802 | ||
803 | on_trace(__PRETTY_FUNCTION__, ifp, from, group_addr, num_sources, | |
804 | sources); | |
805 | ||
806 | /* | |
807 | * If the requested filter mode is INCLUDE *and* the requested source | |
808 | * list is empty, then the entry corresponding to the requested | |
809 | * interface and multicast address is deleted if present. If no such | |
810 | * entry is present, the request is ignored. | |
811 | */ | |
812 | if (num_sources) { | |
813 | /* non-existant group is created as INCLUDE {empty} */ | |
814 | group = igmp_add_group_by_addr(igmp, group_addr); | |
815 | if (!group) { | |
816 | return; | |
817 | } | |
818 | } else { | |
819 | group = find_group_by_addr(igmp, group_addr); | |
820 | if (!group) | |
821 | return; | |
822 | } | |
823 | ||
824 | if (group->group_filtermode_isexcl) { | |
825 | /* EXCLUDE mode */ | |
826 | toin_excl(group, num_sources, sources); | |
827 | } else { | |
828 | /* INCLUDE mode */ | |
829 | toin_incl(group, num_sources, sources); | |
830 | } | |
12e41d03 DL |
831 | } |
832 | ||
ac4d0be5 | 833 | static void toex_incl(struct igmp_group *group, int num_sources, |
834 | struct in_addr *sources) | |
12e41d03 | 835 | { |
ac4d0be5 | 836 | int num_sources_tosend = 0; |
837 | int i; | |
838 | ||
839 | zassert(!group->group_filtermode_isexcl); | |
840 | ||
841 | /* Set DELETE flag for all known sources (A) */ | |
842 | source_mark_delete_flag(group); | |
843 | ||
844 | /* Clear off SEND flag from all known sources (A) */ | |
845 | source_clear_send_flag(group->group_source_list); | |
846 | ||
847 | /* Scan received sources (B) */ | |
848 | for (i = 0; i < num_sources; ++i) { | |
849 | struct igmp_source *source; | |
850 | struct in_addr *src_addr; | |
851 | ||
852 | src_addr = sources + i; | |
853 | ||
854 | /* Lookup reported source (B) */ | |
855 | source = igmp_find_source_by_addr(group, *src_addr); | |
856 | if (source) { | |
857 | /* If found, clear deletion flag: (A*B) */ | |
858 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
859 | /* and set SEND flag (A*B) */ | |
860 | IGMP_SOURCE_DO_SEND(source->source_flags); | |
861 | ++num_sources_tosend; | |
862 | } else { | |
863 | /* If source not found, create source with timer=0: | |
864 | * (B-A)=0 */ | |
865 | source = source_new(group, *src_addr); | |
866 | if (!source) { | |
867 | /* ugh, internal malloc failure, skip source */ | |
868 | continue; | |
869 | } | |
870 | zassert(!source->t_source_timer); /* (B-A) timer=0 */ | |
871 | } | |
872 | ||
873 | } /* Scan received sources (B) */ | |
874 | ||
875 | group->group_filtermode_isexcl = 1; /* boolean=true */ | |
876 | ||
877 | /* Delete all sources marked with DELETE flag (A-B) */ | |
878 | source_delete_by_flag(group->group_source_list); | |
879 | ||
880 | /* Send sources marked with SEND flag: Q(G,A*B) */ | |
881 | if (num_sources_tosend > 0) { | |
882 | source_query_send_by_flag(group, num_sources_tosend); | |
883 | } | |
884 | ||
885 | zassert(group->group_filtermode_isexcl); | |
886 | ||
887 | group_exclude_fwd_anysrc_ifempty(group); | |
12e41d03 DL |
888 | } |
889 | ||
ac4d0be5 | 890 | static void toex_excl(struct igmp_group *group, int num_sources, |
891 | struct in_addr *sources) | |
12e41d03 | 892 | { |
ac4d0be5 | 893 | int num_sources_tosend = 0; |
894 | int i; | |
895 | ||
896 | /* set DELETE flag for all known sources (X,Y) */ | |
897 | source_mark_delete_flag(group); | |
898 | ||
899 | /* clear off SEND flag from all known sources (X,Y) */ | |
900 | source_clear_send_flag(group->group_source_list); | |
901 | ||
902 | if (num_sources == 0) { | |
903 | struct igmp_source *source; | |
904 | struct in_addr any = {.s_addr = INADDR_ANY}; | |
905 | ||
906 | source = igmp_find_source_by_addr(group, any); | |
907 | if (source) | |
908 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
909 | } | |
910 | ||
911 | /* scan received sources (A) */ | |
912 | for (i = 0; i < num_sources; ++i) { | |
913 | struct igmp_source *source; | |
914 | struct in_addr *src_addr; | |
915 | ||
916 | src_addr = sources + i; | |
917 | ||
918 | /* lookup reported source (A) in known sources (X,Y) */ | |
919 | source = igmp_find_source_by_addr(group, *src_addr); | |
920 | if (source) { | |
921 | /* if found, clear off DELETE flag from reported source | |
922 | * (A) */ | |
923 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
924 | } else { | |
925 | /* if not found, create source with Group Timer: | |
926 | * (A-X-Y)=Group Timer */ | |
927 | long group_timer_msec; | |
928 | source = source_new(group, *src_addr); | |
929 | if (!source) { | |
930 | /* ugh, internal malloc failure, skip source */ | |
931 | continue; | |
932 | } | |
933 | ||
934 | zassert(!source->t_source_timer); /* timer == 0 */ | |
935 | group_timer_msec = igmp_group_timer_remain_msec(group); | |
936 | igmp_source_timer_on(group, source, group_timer_msec); | |
937 | zassert(source->t_source_timer); /* (A-X-Y) timer > 0 */ | |
938 | ||
939 | /* make sure source is created with DELETE flag unset */ | |
940 | zassert(!IGMP_SOURCE_TEST_DELETE(source->source_flags)); | |
941 | } | |
942 | ||
943 | /* make sure reported source has DELETE flag unset */ | |
944 | zassert(!IGMP_SOURCE_TEST_DELETE(source->source_flags)); | |
945 | ||
946 | if (source->t_source_timer) { | |
947 | /* if source timer>0 mark SEND flag: Q(G,A-Y) */ | |
948 | IGMP_SOURCE_DO_SEND(source->source_flags); | |
949 | ++num_sources_tosend; | |
950 | } | |
951 | ||
952 | } /* scan received sources (A) */ | |
953 | ||
954 | /* | |
955 | delete all sources marked with DELETE flag: | |
956 | Delete (X-A) | |
957 | Delete (Y-A) | |
958 | */ | |
959 | source_delete_by_flag(group->group_source_list); | |
960 | ||
961 | /* send sources marked with SEND flag: Q(G,A-Y) */ | |
962 | if (num_sources_tosend > 0) { | |
963 | source_query_send_by_flag(group, num_sources_tosend); | |
964 | } | |
12e41d03 DL |
965 | } |
966 | ||
967 | void igmpv3_report_toex(struct igmp_sock *igmp, struct in_addr from, | |
ac4d0be5 | 968 | struct in_addr group_addr, int num_sources, |
969 | struct in_addr *sources) | |
12e41d03 | 970 | { |
ac4d0be5 | 971 | struct interface *ifp = igmp->interface; |
972 | struct igmp_group *group; | |
973 | ||
974 | on_trace(__PRETTY_FUNCTION__, ifp, from, group_addr, num_sources, | |
975 | sources); | |
976 | ||
977 | /* non-existant group is created as INCLUDE {empty} */ | |
978 | group = igmp_add_group_by_addr(igmp, group_addr); | |
979 | if (!group) { | |
980 | return; | |
981 | } | |
982 | ||
983 | if (group->group_filtermode_isexcl) { | |
984 | /* EXCLUDE mode */ | |
985 | toex_excl(group, num_sources, sources); | |
986 | } else { | |
987 | /* INCLUDE mode */ | |
988 | toex_incl(group, num_sources, sources); | |
989 | zassert(group->group_filtermode_isexcl); | |
990 | } | |
991 | zassert(group->group_filtermode_isexcl); | |
992 | ||
993 | /* Group Timer=GMI */ | |
994 | igmp_group_reset_gmi(group); | |
12e41d03 DL |
995 | } |
996 | ||
997 | void igmpv3_report_allow(struct igmp_sock *igmp, struct in_addr from, | |
ac4d0be5 | 998 | struct in_addr group_addr, int num_sources, |
999 | struct in_addr *sources) | |
12e41d03 | 1000 | { |
ac4d0be5 | 1001 | on_trace(__PRETTY_FUNCTION__, igmp->interface, from, group_addr, |
1002 | num_sources, sources); | |
12e41d03 | 1003 | |
ac4d0be5 | 1004 | allow(igmp, from, group_addr, num_sources, sources); |
12e41d03 DL |
1005 | } |
1006 | ||
1007 | /* | |
1008 | RFC3376: 6.6.3.1. Building and Sending Group Specific Queries | |
1009 | ||
1010 | When transmitting a group specific query, if the group timer is | |
1011 | larger than LMQT, the "Suppress Router-Side Processing" bit is set | |
1012 | in the query message. | |
1013 | */ | |
1014 | static void group_retransmit_group(struct igmp_group *group) | |
1015 | { | |
ac4d0be5 | 1016 | struct igmp_sock *igmp; |
1017 | struct pim_interface *pim_ifp; | |
1018 | long lmqc; /* Last Member Query Count */ | |
1019 | long lmqi_msec; /* Last Member Query Interval */ | |
1020 | long lmqt_msec; /* Last Member Query Time */ | |
1021 | int s_flag; | |
1022 | int query_buf_size; | |
1023 | ||
1024 | igmp = group->group_igmp_sock; | |
1025 | pim_ifp = igmp->interface->info; | |
1026 | ||
1027 | if (pim_ifp->igmp_version == 3) { | |
1028 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; | |
1029 | } else { | |
1030 | query_buf_size = IGMP_V12_MSG_SIZE; | |
1031 | } | |
1032 | ||
1033 | char query_buf[query_buf_size]; | |
1034 | ||
1035 | lmqc = igmp->querier_robustness_variable; | |
1036 | lmqi_msec = 100 * pim_ifp->igmp_specific_query_max_response_time_dsec; | |
1037 | lmqt_msec = lmqc * lmqi_msec; | |
1038 | ||
1039 | /* | |
1040 | RFC3376: 6.6.3.1. Building and Sending Group Specific Queries | |
1041 | ||
1042 | When transmitting a group specific query, if the group timer is | |
1043 | larger than LMQT, the "Suppress Router-Side Processing" bit is set | |
1044 | in the query message. | |
1045 | */ | |
1046 | s_flag = igmp_group_timer_remain_msec(group) > lmqt_msec; | |
1047 | ||
1048 | if (PIM_DEBUG_IGMP_TRACE) { | |
1049 | char group_str[INET_ADDRSTRLEN]; | |
1050 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1051 | sizeof(group_str)); | |
1052 | zlog_debug( | |
1053 | "retransmit_group_specific_query: group %s on %s: s_flag=%d count=%d", | |
1054 | group_str, igmp->interface->name, s_flag, | |
1055 | group->group_specific_query_retransmit_count); | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
1060 | ||
1061 | Group-Specific and Group-and-Source-Specific Queries are sent with | |
1062 | an IP destination address equal to the multicast address of | |
1063 | interest. | |
1064 | */ | |
1065 | ||
1066 | igmp_send_query(pim_ifp->igmp_version, group, igmp->fd, | |
1067 | igmp->interface->name, query_buf, sizeof(query_buf), | |
1068 | 0 /* num_sources_tosend */, | |
1069 | group->group_addr /* dst_addr */, | |
1070 | group->group_addr /* group_addr */, | |
1071 | pim_ifp->igmp_specific_query_max_response_time_dsec, | |
1072 | s_flag, igmp->querier_robustness_variable, | |
1073 | igmp->querier_query_interval); | |
12e41d03 DL |
1074 | } |
1075 | ||
1076 | /* | |
1077 | RFC3376: 6.6.3.2. Building and Sending Group and Source Specific Queries | |
1078 | ||
1079 | When building a group and source specific query for a group G, two | |
1080 | separate query messages are sent for the group. The first one has | |
1081 | the "Suppress Router-Side Processing" bit set and contains all the | |
1082 | sources with retransmission state and timers greater than LMQT. The | |
1083 | second has the "Suppress Router-Side Processing" bit clear and | |
1084 | contains all the sources with retransmission state and timers lower | |
1085 | or equal to LMQT. If either of the two calculated messages does not | |
1086 | contain any sources, then its transmission is suppressed. | |
1087 | */ | |
1088 | static int group_retransmit_sources(struct igmp_group *group, | |
1089 | int send_with_sflag_set) | |
1090 | { | |
ac4d0be5 | 1091 | struct igmp_sock *igmp; |
1092 | struct pim_interface *pim_ifp; | |
1093 | long lmqc; /* Last Member Query Count */ | |
1094 | long lmqi_msec; /* Last Member Query Interval */ | |
1095 | long lmqt_msec; /* Last Member Query Time */ | |
1096 | char query_buf1[PIM_IGMP_BUFSIZE_WRITE]; /* 1 = with s_flag set */ | |
1097 | char query_buf2[PIM_IGMP_BUFSIZE_WRITE]; /* 2 = with s_flag clear */ | |
1098 | int query_buf1_max_sources; | |
1099 | int query_buf2_max_sources; | |
1100 | struct in_addr *source_addr1; | |
1101 | struct in_addr *source_addr2; | |
1102 | int num_sources_tosend1; | |
1103 | int num_sources_tosend2; | |
1104 | struct listnode *src_node; | |
1105 | struct igmp_source *src; | |
1106 | int num_retransmit_sources_left = 0; | |
1107 | ||
1108 | source_addr1 = (struct in_addr *)(query_buf1 + IGMP_V3_SOURCES_OFFSET); | |
1109 | source_addr2 = (struct in_addr *)(query_buf2 + IGMP_V3_SOURCES_OFFSET); | |
1110 | ||
1111 | igmp = group->group_igmp_sock; | |
1112 | pim_ifp = igmp->interface->info; | |
1113 | ||
1114 | lmqc = igmp->querier_robustness_variable; | |
1115 | lmqi_msec = 100 * pim_ifp->igmp_specific_query_max_response_time_dsec; | |
1116 | lmqt_msec = lmqc * lmqi_msec; | |
1117 | ||
1118 | /* Scan all group sources */ | |
1119 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { | |
1120 | ||
1121 | /* Source has retransmission state? */ | |
1122 | if (src->source_query_retransmit_count < 1) | |
1123 | continue; | |
1124 | ||
1125 | if (--src->source_query_retransmit_count > 0) { | |
1126 | ++num_retransmit_sources_left; | |
1127 | } | |
1128 | ||
1129 | /* Copy source address into appropriate query buffer */ | |
1130 | if (igmp_source_timer_remain_msec(src) > lmqt_msec) { | |
1131 | *source_addr1 = src->source_addr; | |
1132 | ++source_addr1; | |
1133 | } else { | |
1134 | *source_addr2 = src->source_addr; | |
1135 | ++source_addr2; | |
1136 | } | |
1137 | } | |
1138 | ||
1139 | num_sources_tosend1 = | |
1140 | source_addr1 | |
1141 | - (struct in_addr *)(query_buf1 + IGMP_V3_SOURCES_OFFSET); | |
1142 | num_sources_tosend2 = | |
1143 | source_addr2 | |
1144 | - (struct in_addr *)(query_buf2 + IGMP_V3_SOURCES_OFFSET); | |
1145 | ||
1146 | if (PIM_DEBUG_IGMP_TRACE) { | |
1147 | char group_str[INET_ADDRSTRLEN]; | |
1148 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1149 | sizeof(group_str)); | |
1150 | zlog_debug( | |
1151 | "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", | |
1152 | group_str, igmp->interface->name, num_sources_tosend1, | |
1153 | num_sources_tosend2, send_with_sflag_set, | |
1154 | num_retransmit_sources_left); | |
1155 | } | |
1156 | ||
1157 | if (num_sources_tosend1 > 0) { | |
1158 | /* | |
1159 | Send group-and-source-specific query with s_flag set and all | |
1160 | sources with timers greater than LMQT. | |
1161 | */ | |
1162 | ||
1163 | if (send_with_sflag_set) { | |
1164 | ||
1165 | query_buf1_max_sources = | |
1166 | (sizeof(query_buf1) - IGMP_V3_SOURCES_OFFSET) | |
1167 | >> 2; | |
1168 | if (num_sources_tosend1 > query_buf1_max_sources) { | |
1169 | char group_str[INET_ADDRSTRLEN]; | |
1170 | pim_inet4_dump("<group?>", group->group_addr, | |
1171 | group_str, sizeof(group_str)); | |
1172 | zlog_warn( | |
1173 | "%s: group %s on %s: s_flag=1 unable to fit %d sources into buf_size=%zu (max_sources=%d)", | |
1174 | __PRETTY_FUNCTION__, group_str, | |
1175 | igmp->interface->name, | |
1176 | num_sources_tosend1, sizeof(query_buf1), | |
1177 | query_buf1_max_sources); | |
1178 | } else { | |
1179 | /* | |
1180 | RFC3376: 4.1.12. IP Destination Addresses for | |
1181 | Queries | |
1182 | ||
1183 | Group-Specific and Group-and-Source-Specific | |
1184 | Queries are sent with | |
1185 | an IP destination address equal to the | |
1186 | multicast address of | |
1187 | interest. | |
1188 | */ | |
1189 | ||
1190 | igmp_send_query( | |
1191 | pim_ifp->igmp_version, group, igmp->fd, | |
1192 | igmp->interface->name, query_buf1, | |
1193 | sizeof(query_buf1), num_sources_tosend1, | |
1194 | group->group_addr, group->group_addr, | |
1195 | pim_ifp->igmp_specific_query_max_response_time_dsec, | |
1196 | 1 /* s_flag */, | |
1197 | igmp->querier_robustness_variable, | |
1198 | igmp->querier_query_interval); | |
1199 | } | |
1200 | ||
1201 | } /* send_with_sflag_set */ | |
1202 | } | |
1203 | ||
1204 | if (num_sources_tosend2 > 0) { | |
1205 | /* | |
1206 | Send group-and-source-specific query with s_flag clear and all | |
1207 | sources with timers lower or equal to LMQT. | |
1208 | */ | |
1209 | ||
1210 | query_buf2_max_sources = | |
1211 | (sizeof(query_buf2) - IGMP_V3_SOURCES_OFFSET) >> 2; | |
1212 | if (num_sources_tosend2 > query_buf2_max_sources) { | |
1213 | char group_str[INET_ADDRSTRLEN]; | |
1214 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1215 | sizeof(group_str)); | |
1216 | zlog_warn( | |
1217 | "%s: group %s on %s: s_flag=0 unable to fit %d sources into buf_size=%zu (max_sources=%d)", | |
1218 | __PRETTY_FUNCTION__, group_str, | |
1219 | igmp->interface->name, num_sources_tosend2, | |
1220 | sizeof(query_buf2), query_buf2_max_sources); | |
1221 | } else { | |
1222 | /* | |
1223 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
1224 | ||
1225 | Group-Specific and Group-and-Source-Specific Queries | |
1226 | are sent with | |
1227 | an IP destination address equal to the multicast | |
1228 | address of | |
1229 | interest. | |
1230 | */ | |
1231 | ||
1232 | igmp_send_query( | |
1233 | pim_ifp->igmp_version, group, igmp->fd, | |
1234 | igmp->interface->name, query_buf2, | |
1235 | sizeof(query_buf2), num_sources_tosend2, | |
1236 | group->group_addr, group->group_addr, | |
1237 | pim_ifp->igmp_specific_query_max_response_time_dsec, | |
1238 | 0 /* s_flag */, | |
1239 | igmp->querier_robustness_variable, | |
1240 | igmp->querier_query_interval); | |
1241 | } | |
1242 | } | |
1243 | ||
1244 | return num_retransmit_sources_left; | |
12e41d03 DL |
1245 | } |
1246 | ||
1247 | static int igmp_group_retransmit(struct thread *t) | |
1248 | { | |
ac4d0be5 | 1249 | struct igmp_group *group; |
1250 | int num_retransmit_sources_left; | |
1251 | int send_with_sflag_set; /* boolean */ | |
1252 | ||
1253 | group = THREAD_ARG(t); | |
1254 | ||
1255 | if (PIM_DEBUG_IGMP_TRACE) { | |
1256 | char group_str[INET_ADDRSTRLEN]; | |
1257 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1258 | sizeof(group_str)); | |
1259 | zlog_debug("group_retransmit_timer: group %s on %s", group_str, | |
1260 | group->group_igmp_sock->interface->name); | |
1261 | } | |
1262 | ||
1263 | /* Retransmit group-specific queries? (RFC3376: 6.6.3.1) */ | |
1264 | if (group->group_specific_query_retransmit_count > 0) { | |
1265 | ||
1266 | /* Retransmit group-specific queries (RFC3376: 6.6.3.1) */ | |
1267 | group_retransmit_group(group); | |
1268 | --group->group_specific_query_retransmit_count; | |
1269 | ||
1270 | /* | |
1271 | RFC3376: 6.6.3.2 | |
1272 | If a group specific query is scheduled to be transmitted at | |
1273 | the | |
1274 | same time as a group and source specific query for the same | |
1275 | group, | |
1276 | then transmission of the group and source specific message | |
1277 | with the | |
1278 | "Suppress Router-Side Processing" bit set may be suppressed. | |
1279 | */ | |
1280 | send_with_sflag_set = 0; /* boolean=false */ | |
1281 | } else { | |
1282 | send_with_sflag_set = 1; /* boolean=true */ | |
1283 | } | |
1284 | ||
1285 | /* Retransmit group-and-source-specific queries (RFC3376: 6.6.3.2) */ | |
1286 | num_retransmit_sources_left = | |
1287 | group_retransmit_sources(group, send_with_sflag_set); | |
1288 | ||
1289 | group->t_group_query_retransmit_timer = NULL; | |
1290 | ||
1291 | /* | |
1292 | Keep group retransmit timer running if there is any retransmit | |
1293 | counter pending | |
1294 | */ | |
1295 | if ((num_retransmit_sources_left > 0) | |
1296 | || (group->group_specific_query_retransmit_count > 0)) { | |
1297 | group_retransmit_timer_on(group); | |
1298 | } | |
1299 | ||
1300 | return 0; | |
12e41d03 DL |
1301 | } |
1302 | ||
1303 | /* | |
1304 | group_retransmit_timer_on: | |
1305 | if group retransmit timer isn't running, starts it; | |
1306 | otherwise, do nothing | |
1307 | */ | |
1308 | static void group_retransmit_timer_on(struct igmp_group *group) | |
1309 | { | |
ac4d0be5 | 1310 | struct igmp_sock *igmp; |
1311 | struct pim_interface *pim_ifp; | |
1312 | long lmqi_msec; /* Last Member Query Interval */ | |
1313 | ||
1314 | /* if group retransmit timer is running, do nothing */ | |
1315 | if (group->t_group_query_retransmit_timer) { | |
1316 | return; | |
1317 | } | |
1318 | ||
1319 | igmp = group->group_igmp_sock; | |
1320 | pim_ifp = igmp->interface->info; | |
1321 | ||
1322 | lmqi_msec = 100 * pim_ifp->igmp_specific_query_max_response_time_dsec; | |
1323 | ||
1324 | if (PIM_DEBUG_IGMP_TRACE) { | |
1325 | char group_str[INET_ADDRSTRLEN]; | |
1326 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1327 | sizeof(group_str)); | |
1328 | zlog_debug( | |
1329 | "Scheduling %ld.%03ld sec retransmit timer for group %s on %s", | |
1330 | lmqi_msec / 1000, lmqi_msec % 1000, group_str, | |
1331 | igmp->interface->name); | |
1332 | } | |
1333 | ||
1334 | THREAD_TIMER_MSEC_ON(master, group->t_group_query_retransmit_timer, | |
1335 | igmp_group_retransmit, group, lmqi_msec); | |
12e41d03 DL |
1336 | } |
1337 | ||
1338 | static long igmp_group_timer_remain_msec(struct igmp_group *group) | |
1339 | { | |
ac4d0be5 | 1340 | return pim_time_timer_remain_msec(group->t_group_timer); |
12e41d03 DL |
1341 | } |
1342 | ||
1343 | static long igmp_source_timer_remain_msec(struct igmp_source *source) | |
1344 | { | |
ac4d0be5 | 1345 | return pim_time_timer_remain_msec(source->t_source_timer); |
12e41d03 DL |
1346 | } |
1347 | ||
1348 | /* | |
1349 | RFC3376: 6.6.3.1. Building and Sending Group Specific Queries | |
1350 | */ | |
1351 | static void group_query_send(struct igmp_group *group) | |
1352 | { | |
ac4d0be5 | 1353 | long lmqc; /* Last Member Query Count */ |
12e41d03 | 1354 | |
ac4d0be5 | 1355 | lmqc = group->group_igmp_sock->querier_robustness_variable; |
12e41d03 | 1356 | |
ac4d0be5 | 1357 | /* lower group timer to lmqt */ |
1358 | igmp_group_timer_lower_to_lmqt(group); | |
12e41d03 | 1359 | |
ac4d0be5 | 1360 | /* reset retransmission counter */ |
1361 | group->group_specific_query_retransmit_count = lmqc; | |
12e41d03 | 1362 | |
ac4d0be5 | 1363 | /* immediately send group specific query (decrease retransmit counter by |
1364 | * 1)*/ | |
1365 | group_retransmit_group(group); | |
12e41d03 | 1366 | |
ac4d0be5 | 1367 | /* make sure group retransmit timer is running */ |
1368 | group_retransmit_timer_on(group); | |
12e41d03 DL |
1369 | } |
1370 | ||
1371 | /* | |
1372 | RFC3376: 6.6.3.2. Building and Sending Group and Source Specific Queries | |
1373 | */ | |
1374 | static void source_query_send_by_flag(struct igmp_group *group, | |
1375 | int num_sources_tosend) | |
1376 | { | |
ac4d0be5 | 1377 | struct igmp_sock *igmp; |
1378 | struct pim_interface *pim_ifp; | |
1379 | struct listnode *src_node; | |
1380 | struct igmp_source *src; | |
1381 | long lmqc; /* Last Member Query Count */ | |
1382 | long lmqi_msec; /* Last Member Query Interval */ | |
1383 | long lmqt_msec; /* Last Member Query Time */ | |
1384 | ||
1385 | zassert(num_sources_tosend > 0); | |
1386 | ||
1387 | igmp = group->group_igmp_sock; | |
1388 | pim_ifp = igmp->interface->info; | |
1389 | ||
1390 | lmqc = igmp->querier_robustness_variable; | |
1391 | lmqi_msec = 100 * pim_ifp->igmp_specific_query_max_response_time_dsec; | |
1392 | lmqt_msec = lmqc * lmqi_msec; | |
1393 | ||
1394 | /* | |
1395 | RFC3376: 6.6.3.2. Building and Sending Group and Source Specific | |
1396 | Queries | |
1397 | ||
1398 | (...) for each of the sources in X of group G, with source timer | |
1399 | larger | |
1400 | than LMQT: | |
1401 | o Set number of retransmissions for each source to [Last Member | |
1402 | Query Count]. | |
1403 | o Lower source timer to LMQT. | |
1404 | */ | |
1405 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { | |
1406 | if (IGMP_SOURCE_TEST_SEND(src->source_flags)) { | |
1407 | /* source "src" in X of group G */ | |
1408 | if (igmp_source_timer_remain_msec(src) > lmqt_msec) { | |
1409 | src->source_query_retransmit_count = lmqc; | |
1410 | igmp_source_timer_lower_to_lmqt(src); | |
1411 | } | |
1412 | } | |
1413 | } | |
1414 | ||
1415 | /* send group-and-source specific queries */ | |
1416 | group_retransmit_sources(group, 1 /* send_with_sflag_set=true */); | |
1417 | ||
1418 | /* make sure group retransmit timer is running */ | |
1419 | group_retransmit_timer_on(group); | |
12e41d03 DL |
1420 | } |
1421 | ||
ac4d0be5 | 1422 | static void block_excl(struct igmp_group *group, int num_sources, |
1423 | struct in_addr *sources) | |
12e41d03 | 1424 | { |
ac4d0be5 | 1425 | int num_sources_tosend = 0; |
1426 | int i; | |
1427 | ||
1428 | /* 1. clear off SEND flag from all known sources (X,Y) */ | |
1429 | source_clear_send_flag(group->group_source_list); | |
1430 | ||
1431 | /* 2. scan received sources (A) */ | |
1432 | for (i = 0; i < num_sources; ++i) { | |
1433 | struct igmp_source *source; | |
1434 | struct in_addr *src_addr; | |
1435 | ||
1436 | src_addr = sources + i; | |
1437 | ||
1438 | /* lookup reported source (A) in known sources (X,Y) */ | |
1439 | source = igmp_find_source_by_addr(group, *src_addr); | |
1440 | if (!source) { | |
1441 | /* 3: if not found, create source with Group Timer: | |
1442 | * (A-X-Y)=Group Timer */ | |
1443 | long group_timer_msec; | |
1444 | source = source_new(group, *src_addr); | |
1445 | if (!source) { | |
1446 | /* ugh, internal malloc failure, skip source */ | |
1447 | continue; | |
1448 | } | |
1449 | ||
1450 | zassert(!source->t_source_timer); /* timer == 0 */ | |
1451 | group_timer_msec = igmp_group_timer_remain_msec(group); | |
1452 | igmp_source_timer_on(group, source, group_timer_msec); | |
1453 | zassert(source->t_source_timer); /* (A-X-Y) timer > 0 */ | |
1454 | } | |
1455 | ||
1456 | if (source->t_source_timer) { | |
1457 | /* 4. if source timer>0 mark SEND flag: Q(G,A-Y) */ | |
1458 | IGMP_SOURCE_DO_SEND(source->source_flags); | |
1459 | ++num_sources_tosend; | |
1460 | } | |
1461 | } | |
1462 | ||
1463 | /* 5. send sources marked with SEND flag: Q(G,A-Y) */ | |
1464 | if (num_sources_tosend > 0) { | |
1465 | source_query_send_by_flag(group, num_sources_tosend); | |
1466 | } | |
12e41d03 DL |
1467 | } |
1468 | ||
ac4d0be5 | 1469 | static void block_incl(struct igmp_group *group, int num_sources, |
1470 | struct in_addr *sources) | |
12e41d03 | 1471 | { |
ac4d0be5 | 1472 | int num_sources_tosend = 0; |
1473 | int i; | |
1474 | ||
1475 | /* 1. clear off SEND flag from all known sources (B) */ | |
1476 | source_clear_send_flag(group->group_source_list); | |
1477 | ||
1478 | /* 2. scan received sources (A) */ | |
1479 | for (i = 0; i < num_sources; ++i) { | |
1480 | struct igmp_source *source; | |
1481 | struct in_addr *src_addr; | |
1482 | ||
1483 | src_addr = sources + i; | |
1484 | ||
1485 | /* lookup reported source (A) in known sources (B) */ | |
1486 | source = igmp_find_source_by_addr(group, *src_addr); | |
1487 | if (source) { | |
1488 | /* 3. if found (A*B), mark SEND flag: Q(G,A*B) */ | |
1489 | IGMP_SOURCE_DO_SEND(source->source_flags); | |
1490 | ++num_sources_tosend; | |
1491 | } | |
1492 | } | |
1493 | ||
1494 | /* 4. send sources marked with SEND flag: Q(G,A*B) */ | |
1495 | if (num_sources_tosend > 0) { | |
1496 | source_query_send_by_flag(group, num_sources_tosend); | |
1497 | } | |
12e41d03 DL |
1498 | } |
1499 | ||
1500 | void igmpv3_report_block(struct igmp_sock *igmp, struct in_addr from, | |
ac4d0be5 | 1501 | struct in_addr group_addr, int num_sources, |
1502 | struct in_addr *sources) | |
12e41d03 | 1503 | { |
ac4d0be5 | 1504 | struct interface *ifp = igmp->interface; |
1505 | struct igmp_group *group; | |
1506 | ||
1507 | on_trace(__PRETTY_FUNCTION__, ifp, from, group_addr, num_sources, | |
1508 | sources); | |
1509 | ||
1510 | /* non-existant group is created as INCLUDE {empty} */ | |
1511 | group = igmp_add_group_by_addr(igmp, group_addr); | |
1512 | if (!group) { | |
1513 | return; | |
1514 | } | |
1515 | ||
1516 | if (group->group_filtermode_isexcl) { | |
1517 | /* EXCLUDE mode */ | |
1518 | block_excl(group, num_sources, sources); | |
1519 | } else { | |
1520 | /* INCLUDE mode */ | |
1521 | block_incl(group, num_sources, sources); | |
1522 | } | |
12e41d03 DL |
1523 | } |
1524 | ||
1525 | void igmp_group_timer_lower_to_lmqt(struct igmp_group *group) | |
1526 | { | |
ac4d0be5 | 1527 | struct igmp_sock *igmp; |
1528 | struct interface *ifp; | |
1529 | struct pim_interface *pim_ifp; | |
1530 | char *ifname; | |
1531 | int lmqi_dsec; /* Last Member Query Interval */ | |
1532 | int lmqc; /* Last Member Query Count */ | |
1533 | int lmqt_msec; /* Last Member Query Time */ | |
1534 | ||
1535 | /* | |
1536 | RFC 3376: 6.2.2. Definition of Group Timers | |
1537 | ||
1538 | The group timer is only used when a group is in EXCLUDE mode and | |
1539 | it represents the time for the *filter-mode* of the group to | |
1540 | expire and switch to INCLUDE mode. | |
1541 | */ | |
1542 | if (!group->group_filtermode_isexcl) { | |
1543 | return; | |
1544 | } | |
1545 | ||
1546 | igmp = group->group_igmp_sock; | |
1547 | ifp = igmp->interface; | |
1548 | pim_ifp = ifp->info; | |
1549 | ifname = ifp->name; | |
1550 | ||
1551 | lmqi_dsec = pim_ifp->igmp_specific_query_max_response_time_dsec; | |
1552 | lmqc = igmp->querier_robustness_variable; | |
1553 | lmqt_msec = PIM_IGMP_LMQT_MSEC( | |
1554 | lmqi_dsec, lmqc); /* lmqt_msec = (100 * lmqi_dsec) * lmqc */ | |
1555 | ||
1556 | if (PIM_DEBUG_IGMP_TRACE) { | |
1557 | char group_str[INET_ADDRSTRLEN]; | |
1558 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1559 | sizeof(group_str)); | |
1560 | zlog_debug( | |
1561 | "%s: group %s on %s: LMQC=%d LMQI=%d dsec LMQT=%d msec", | |
1562 | __PRETTY_FUNCTION__, group_str, ifname, lmqc, lmqi_dsec, | |
1563 | lmqt_msec); | |
1564 | } | |
1565 | ||
1566 | zassert(group->group_filtermode_isexcl); | |
1567 | ||
1568 | igmp_group_timer_on(group, lmqt_msec, ifname); | |
12e41d03 DL |
1569 | } |
1570 | ||
1571 | void igmp_source_timer_lower_to_lmqt(struct igmp_source *source) | |
1572 | { | |
ac4d0be5 | 1573 | struct igmp_group *group; |
1574 | struct igmp_sock *igmp; | |
1575 | struct interface *ifp; | |
1576 | struct pim_interface *pim_ifp; | |
1577 | char *ifname; | |
1578 | int lmqi_dsec; /* Last Member Query Interval */ | |
1579 | int lmqc; /* Last Member Query Count */ | |
1580 | int lmqt_msec; /* Last Member Query Time */ | |
1581 | ||
1582 | group = source->source_group; | |
1583 | igmp = group->group_igmp_sock; | |
1584 | ifp = igmp->interface; | |
1585 | pim_ifp = ifp->info; | |
1586 | ifname = ifp->name; | |
1587 | ||
1588 | lmqi_dsec = pim_ifp->igmp_specific_query_max_response_time_dsec; | |
1589 | lmqc = igmp->querier_robustness_variable; | |
1590 | lmqt_msec = PIM_IGMP_LMQT_MSEC( | |
1591 | lmqi_dsec, lmqc); /* lmqt_msec = (100 * lmqi_dsec) * lmqc */ | |
1592 | ||
1593 | if (PIM_DEBUG_IGMP_TRACE) { | |
1594 | char group_str[INET_ADDRSTRLEN]; | |
1595 | char source_str[INET_ADDRSTRLEN]; | |
1596 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1597 | sizeof(group_str)); | |
1598 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
1599 | sizeof(source_str)); | |
1600 | zlog_debug( | |
1601 | "%s: group %s source %s on %s: LMQC=%d LMQI=%d dsec LMQT=%d msec", | |
1602 | __PRETTY_FUNCTION__, group_str, source_str, ifname, | |
1603 | lmqc, lmqi_dsec, lmqt_msec); | |
1604 | } | |
1605 | ||
1606 | igmp_source_timer_on(group, source, lmqt_msec); | |
12e41d03 DL |
1607 | } |
1608 | ||
ac4d0be5 | 1609 | void igmp_v3_send_query(struct igmp_group *group, int fd, const char *ifname, |
1610 | char *query_buf, int query_buf_size, int num_sources, | |
1611 | struct in_addr dst_addr, struct in_addr group_addr, | |
1612 | int query_max_response_time_dsec, uint8_t s_flag, | |
1613 | uint8_t querier_robustness_variable, | |
1614 | uint16_t querier_query_interval) | |
12e41d03 | 1615 | { |
ac4d0be5 | 1616 | ssize_t msg_size; |
1617 | uint8_t max_resp_code; | |
1618 | uint8_t qqic; | |
1619 | ssize_t sent; | |
1620 | struct sockaddr_in to; | |
1621 | socklen_t tolen; | |
1622 | uint16_t checksum; | |
1623 | ||
1624 | zassert(num_sources >= 0); | |
1625 | ||
1626 | msg_size = IGMP_V3_SOURCES_OFFSET + (num_sources << 2); | |
1627 | if (msg_size > query_buf_size) { | |
1628 | zlog_err( | |
1629 | "%s %s: unable to send: msg_size=%zd larger than query_buf_size=%d", | |
1630 | __FILE__, __PRETTY_FUNCTION__, msg_size, | |
1631 | query_buf_size); | |
1632 | return; | |
1633 | } | |
1634 | ||
1635 | s_flag = PIM_FORCE_BOOLEAN(s_flag); | |
1636 | zassert((s_flag == 0) || (s_flag == 1)); | |
1637 | ||
1638 | max_resp_code = igmp_msg_encode16to8(query_max_response_time_dsec); | |
1639 | qqic = igmp_msg_encode16to8(querier_query_interval); | |
1640 | ||
1641 | /* | |
1642 | RFC 3376: 4.1.6. QRV (Querier's Robustness Variable) | |
1643 | ||
1644 | If non-zero, the QRV field contains the [Robustness Variable] | |
1645 | value used by the querier, i.e., the sender of the Query. If the | |
1646 | querier's [Robustness Variable] exceeds 7, the maximum value of | |
1647 | the QRV field, the QRV is set to zero. | |
1648 | */ | |
1649 | if (querier_robustness_variable > 7) { | |
1650 | querier_robustness_variable = 0; | |
1651 | } | |
1652 | ||
1653 | query_buf[0] = PIM_IGMP_MEMBERSHIP_QUERY; | |
1654 | query_buf[1] = max_resp_code; | |
1655 | *(uint16_t *)(query_buf + IGMP_CHECKSUM_OFFSET) = | |
1656 | 0; /* for computing checksum */ | |
1657 | memcpy(query_buf + 4, &group_addr, sizeof(struct in_addr)); | |
1658 | ||
1659 | query_buf[8] = (s_flag << 3) | querier_robustness_variable; | |
1660 | query_buf[9] = qqic; | |
1661 | *(uint16_t *)(query_buf + IGMP_V3_NUMSOURCES_OFFSET) = | |
1662 | htons(num_sources); | |
1663 | ||
1664 | checksum = in_cksum(query_buf, msg_size); | |
1665 | *(uint16_t *)(query_buf + IGMP_CHECKSUM_OFFSET) = checksum; | |
1666 | ||
1667 | if (PIM_DEBUG_IGMP_PACKETS) { | |
1668 | char dst_str[INET_ADDRSTRLEN]; | |
1669 | char group_str[INET_ADDRSTRLEN]; | |
1670 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
1671 | pim_inet4_dump("<group?>", group_addr, group_str, | |
1672 | sizeof(group_str)); | |
1673 | zlog_debug( | |
1674 | "Send IGMPv3 query to %s on %s for group %s, sources=%d msg_size=%zd s_flag=%x QRV=%u QQI=%u QQIC=%02x", | |
1675 | dst_str, ifname, group_str, num_sources, msg_size, | |
1676 | s_flag, querier_robustness_variable, | |
1677 | querier_query_interval, qqic); | |
1678 | } | |
1679 | ||
1680 | memset(&to, 0, sizeof(to)); | |
1681 | to.sin_family = AF_INET; | |
1682 | to.sin_addr = dst_addr; | |
1683 | tolen = sizeof(to); | |
1684 | ||
1685 | sent = sendto(fd, query_buf, msg_size, MSG_DONTWAIT, | |
1686 | (struct sockaddr *)&to, tolen); | |
1687 | if (sent != (ssize_t)msg_size) { | |
1688 | char dst_str[INET_ADDRSTRLEN]; | |
1689 | char group_str[INET_ADDRSTRLEN]; | |
1690 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
1691 | pim_inet4_dump("<group?>", group_addr, group_str, | |
1692 | sizeof(group_str)); | |
1693 | if (sent < 0) { | |
1694 | zlog_warn( | |
1695 | "Send IGMPv3 query failed due to %s on %s: group=%s msg_size=%zd: errno=%d: %s", | |
1696 | dst_str, ifname, group_str, msg_size, errno, | |
1697 | safe_strerror(errno)); | |
1698 | } else { | |
1699 | zlog_warn( | |
1700 | "Send IGMPv3 query failed due to %s on %s: group=%s msg_size=%zd: sent=%zd", | |
1701 | dst_str, ifname, group_str, msg_size, sent); | |
1702 | } | |
1703 | return; | |
1704 | } | |
1705 | ||
1706 | /* | |
1707 | s_flag sanity test: s_flag must be set for general queries | |
1708 | ||
1709 | RFC 3376: 6.6.1. Timer Updates | |
1710 | ||
1711 | When a router sends or receives a query with a clear Suppress | |
1712 | Router-Side Processing flag, it must update its timers to reflect | |
1713 | the correct timeout values for the group or sources being queried. | |
1714 | ||
1715 | General queries don't trigger timer update. | |
1716 | */ | |
1717 | if (!s_flag) { | |
1718 | /* general query? */ | |
1719 | if (PIM_INADDR_IS_ANY(group_addr)) { | |
1720 | char dst_str[INET_ADDRSTRLEN]; | |
1721 | char group_str[INET_ADDRSTRLEN]; | |
1722 | pim_inet4_dump("<dst?>", dst_addr, dst_str, | |
1723 | sizeof(dst_str)); | |
1724 | pim_inet4_dump("<group?>", group_addr, group_str, | |
1725 | sizeof(group_str)); | |
1726 | zlog_warn( | |
1727 | "%s: to %s on %s: group=%s sources=%d: s_flag is clear for general query!", | |
1728 | __PRETTY_FUNCTION__, dst_str, ifname, group_str, | |
1729 | num_sources); | |
1730 | } | |
1731 | } | |
b05b72e8 DW |
1732 | } |
1733 | ||
ac4d0be5 | 1734 | void igmp_v3_recv_query(struct igmp_sock *igmp, const char *from_str, |
1735 | char *igmp_msg) | |
b05b72e8 | 1736 | { |
ac4d0be5 | 1737 | struct interface *ifp; |
1738 | struct pim_interface *pim_ifp; | |
1739 | struct in_addr group_addr; | |
1740 | uint8_t resv_s_qrv = 0; | |
1741 | uint8_t s_flag = 0; | |
1742 | uint8_t qrv = 0; | |
1743 | int i; | |
1744 | ||
1745 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); | |
1746 | ifp = igmp->interface; | |
1747 | pim_ifp = ifp->info; | |
1748 | ||
1749 | /* | |
1750 | * RFC 3376: 4.1.6. QRV (Querier's Robustness Variable) | |
1751 | * | |
1752 | * Routers adopt the QRV value from the most recently received Query | |
1753 | * as their own [Robustness Variable] value, unless that most | |
1754 | * recently received QRV was zero, in which case the receivers use | |
1755 | * the default [Robustness Variable] value specified in section 8.1 | |
1756 | * or a statically configured value. | |
1757 | */ | |
1758 | resv_s_qrv = igmp_msg[8]; | |
1759 | qrv = 7 & resv_s_qrv; | |
1760 | igmp->querier_robustness_variable = | |
1761 | qrv ? qrv : pim_ifp->igmp_default_robustness_variable; | |
1762 | ||
1763 | /* | |
1764 | * RFC 3376: 4.1.7. QQIC (Querier's Query Interval Code) | |
1765 | * | |
1766 | * Multicast routers that are not the current querier adopt the QQI | |
1767 | * value from the most recently received Query as their own [Query | |
1768 | * Interval] value, unless that most recently received QQI was zero, | |
1769 | * in which case the receiving routers use the default. | |
1770 | */ | |
1771 | if (igmp->t_other_querier_timer) { | |
1772 | /* other querier present */ | |
1773 | uint8_t qqic; | |
1774 | uint16_t qqi; | |
1775 | qqic = igmp_msg[9]; | |
1776 | qqi = igmp_msg_decode8to16(qqic); | |
1777 | igmp->querier_query_interval = | |
1778 | qqi ? qqi : pim_ifp->igmp_default_query_interval; | |
1779 | ||
1780 | if (PIM_DEBUG_IGMP_TRACE) { | |
1781 | char ifaddr_str[INET_ADDRSTRLEN]; | |
1782 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
1783 | sizeof(ifaddr_str)); | |
1784 | zlog_debug( | |
1785 | "Querier %s new query interval is %s QQI=%u sec (recv QQIC=%02x from %s)", | |
1786 | ifaddr_str, | |
1787 | qqi ? "recv-non-default" : "default", | |
1788 | igmp->querier_query_interval, qqic, from_str); | |
1789 | } | |
1790 | } | |
1791 | ||
1792 | /* | |
1793 | * RFC 3376: 6.6.1. Timer Updates | |
1794 | * | |
1795 | * When a router sends or receives a query with a clear Suppress | |
1796 | * Router-Side Processing flag, it must update its timers to reflect | |
1797 | * the correct timeout values for the group or sources being queried. | |
1798 | * | |
1799 | * General queries don't trigger timer update. | |
1800 | */ | |
1801 | s_flag = (1 << 3) & resv_s_qrv; | |
1802 | ||
1803 | if (!s_flag) { | |
1804 | /* s_flag is clear */ | |
1805 | ||
1806 | if (PIM_INADDR_IS_ANY(group_addr)) { | |
1807 | /* this is a general query */ | |
1808 | /* log that general query should have the s_flag set */ | |
1809 | zlog_warn( | |
1810 | "General IGMP query v3 from %s on %s: Suppress Router-Side Processing flag is clear", | |
1811 | from_str, ifp->name); | |
1812 | } else { | |
1813 | struct igmp_group *group; | |
1814 | ||
1815 | /* this is a non-general query: perform timer updates */ | |
1816 | ||
1817 | group = find_group_by_addr(igmp, group_addr); | |
1818 | if (group) { | |
1819 | int recv_num_sources = ntohs(*( | |
1820 | uint16_t | |
1821 | *)(igmp_msg | |
1822 | + IGMP_V3_NUMSOURCES_OFFSET)); | |
1823 | ||
1824 | /* | |
1825 | * RFC 3376: 6.6.1. Timer Updates | |
1826 | * Query Q(G,A): Source Timer for sources in A | |
1827 | * are lowered to LMQT | |
1828 | * Query Q(G): Group Timer is lowered to LMQT | |
1829 | */ | |
1830 | if (recv_num_sources < 1) { | |
1831 | /* Query Q(G): Group Timer is lowered to | |
1832 | * LMQT */ | |
1833 | ||
1834 | igmp_group_timer_lower_to_lmqt(group); | |
1835 | } else { | |
1836 | /* Query Q(G,A): Source Timer for | |
1837 | * sources in A are lowered to LMQT */ | |
1838 | ||
1839 | /* Scan sources in query and lower their | |
1840 | * timers to LMQT */ | |
1841 | struct in_addr *sources = | |
1842 | (struct in_addr | |
1843 | *)(igmp_msg | |
1844 | + IGMP_V3_SOURCES_OFFSET); | |
1845 | for (i = 0; i < recv_num_sources; ++i) { | |
1846 | struct in_addr src_addr; | |
1847 | struct igmp_source *src; | |
1848 | memcpy(&src_addr, sources + i, | |
1849 | sizeof(struct in_addr)); | |
1850 | src = igmp_find_source_by_addr( | |
1851 | group, src_addr); | |
1852 | if (src) { | |
1853 | igmp_source_timer_lower_to_lmqt( | |
1854 | src); | |
1855 | } | |
1856 | } | |
1857 | } | |
1858 | } else { | |
1859 | char group_str[INET_ADDRSTRLEN]; | |
1860 | pim_inet4_dump("<group?>", group_addr, | |
1861 | group_str, sizeof(group_str)); | |
1862 | zlog_warn( | |
1863 | "IGMP query v3 from %s on %s: could not find group %s for timer update", | |
1864 | from_str, ifp->name, group_str); | |
1865 | } | |
1866 | } | |
1867 | } /* s_flag is clear: timer updates */ | |
b05b72e8 DW |
1868 | } |
1869 | ||
ac4d0be5 | 1870 | int igmp_v3_recv_report(struct igmp_sock *igmp, struct in_addr from, |
1871 | const char *from_str, char *igmp_msg, int igmp_msg_len) | |
b05b72e8 | 1872 | { |
ac4d0be5 | 1873 | uint16_t recv_checksum; |
1874 | uint16_t checksum; | |
1875 | int num_groups; | |
1876 | uint8_t *group_record; | |
1877 | uint8_t *report_pastend = (uint8_t *)igmp_msg + igmp_msg_len; | |
1878 | struct interface *ifp = igmp->interface; | |
1879 | int i; | |
1880 | int local_ncb = 0; | |
1881 | ||
1882 | if (igmp_msg_len < IGMP_V3_MSG_MIN_SIZE) { | |
1883 | zlog_warn( | |
1884 | "Recv IGMP report v3 from %s on %s: size=%d shorter than minimum=%d", | |
1885 | from_str, ifp->name, igmp_msg_len, | |
1886 | IGMP_V3_MSG_MIN_SIZE); | |
1887 | return -1; | |
1888 | } | |
1889 | ||
1890 | recv_checksum = *(uint16_t *)(igmp_msg + IGMP_CHECKSUM_OFFSET); | |
1891 | ||
1892 | /* for computing checksum */ | |
1893 | *(uint16_t *)(igmp_msg + IGMP_CHECKSUM_OFFSET) = 0; | |
1894 | ||
1895 | checksum = in_cksum(igmp_msg, igmp_msg_len); | |
1896 | if (checksum != recv_checksum) { | |
1897 | zlog_warn( | |
1898 | "Recv IGMP report v3 from %s on %s: checksum mismatch: received=%x computed=%x", | |
1899 | from_str, ifp->name, recv_checksum, checksum); | |
1900 | return -1; | |
1901 | } | |
1902 | ||
1903 | num_groups = ntohs( | |
1904 | *(uint16_t *)(igmp_msg + IGMP_V3_REPORT_NUMGROUPS_OFFSET)); | |
1905 | if (num_groups < 1) { | |
1906 | zlog_warn( | |
1907 | "Recv IGMP report v3 from %s on %s: missing group records", | |
1908 | from_str, ifp->name); | |
1909 | return -1; | |
1910 | } | |
1911 | ||
1912 | if (PIM_DEBUG_IGMP_PACKETS) { | |
1913 | zlog_debug( | |
1914 | "Recv IGMP report v3 from %s on %s: size=%d checksum=%x groups=%d", | |
1915 | from_str, ifp->name, igmp_msg_len, checksum, | |
1916 | num_groups); | |
1917 | } | |
1918 | ||
1919 | group_record = (uint8_t *)igmp_msg + IGMP_V3_REPORT_GROUPPRECORD_OFFSET; | |
1920 | ||
1921 | /* Scan groups */ | |
1922 | for (i = 0; i < num_groups; ++i) { | |
1923 | struct in_addr rec_group; | |
1924 | uint8_t *sources; | |
1925 | uint8_t *src; | |
1926 | int rec_type; | |
1927 | int rec_auxdatalen; | |
1928 | int rec_num_sources; | |
1929 | int j; | |
1930 | struct prefix lncb; | |
1931 | struct prefix g; | |
1932 | ||
1933 | if ((group_record + IGMP_V3_GROUP_RECORD_MIN_SIZE) | |
1934 | > report_pastend) { | |
1935 | zlog_warn( | |
1936 | "Recv IGMP report v3 from %s on %s: group record beyond report end", | |
1937 | from_str, ifp->name); | |
1938 | return -1; | |
1939 | } | |
1940 | ||
1941 | rec_type = group_record[IGMP_V3_GROUP_RECORD_TYPE_OFFSET]; | |
1942 | rec_auxdatalen = | |
1943 | group_record[IGMP_V3_GROUP_RECORD_AUXDATALEN_OFFSET]; | |
1944 | rec_num_sources = ntohs(*( | |
1945 | uint16_t *)(group_record | |
1946 | + IGMP_V3_GROUP_RECORD_NUMSOURCES_OFFSET)); | |
1947 | ||
1948 | memcpy(&rec_group, | |
1949 | group_record + IGMP_V3_GROUP_RECORD_GROUP_OFFSET, | |
1950 | sizeof(struct in_addr)); | |
1951 | ||
1952 | if (PIM_DEBUG_IGMP_PACKETS) { | |
1953 | zlog_debug( | |
1954 | "Recv IGMP report v3 from %s on %s: record=%d type=%d auxdatalen=%d sources=%d group=%s", | |
1955 | from_str, ifp->name, i, rec_type, | |
1956 | rec_auxdatalen, rec_num_sources, | |
1957 | inet_ntoa(rec_group)); | |
1958 | } | |
1959 | ||
1960 | /* Scan sources */ | |
1961 | ||
1962 | sources = group_record + IGMP_V3_GROUP_RECORD_SOURCE_OFFSET; | |
1963 | ||
1964 | for (j = 0, src = sources; j < rec_num_sources; ++j, src += 4) { | |
1965 | ||
1966 | if ((src + 4) > report_pastend) { | |
1967 | zlog_warn( | |
1968 | "Recv IGMP report v3 from %s on %s: group source beyond report end", | |
1969 | from_str, ifp->name); | |
1970 | return -1; | |
1971 | } | |
1972 | ||
1973 | if (PIM_DEBUG_IGMP_PACKETS) { | |
1974 | char src_str[200]; | |
1975 | ||
1976 | if (!inet_ntop(AF_INET, src, src_str, | |
1977 | sizeof(src_str))) | |
1978 | sprintf(src_str, "<source?>"); | |
1979 | ||
1980 | zlog_debug( | |
1981 | "Recv IGMP report v3 from %s on %s: record=%d group=%s source=%s", | |
1982 | from_str, ifp->name, i, | |
1983 | inet_ntoa(rec_group), src_str); | |
1984 | } | |
1985 | } /* for (sources) */ | |
1986 | ||
1987 | ||
1988 | lncb.family = AF_INET; | |
1989 | lncb.u.prefix4.s_addr = 0x000000E0; | |
1990 | lncb.prefixlen = 24; | |
1991 | ||
1992 | g.family = AF_INET; | |
1993 | g.u.prefix4 = rec_group; | |
1994 | g.prefixlen = 32; | |
1995 | /* | |
1996 | * If we receive a igmp report with the group in 224.0.0.0/24 | |
1997 | * then we should ignore it | |
1998 | */ | |
1999 | if (prefix_match(&lncb, &g)) | |
2000 | local_ncb = 1; | |
2001 | ||
2002 | if (!local_ncb) | |
2003 | switch (rec_type) { | |
2004 | case IGMP_GRP_REC_TYPE_MODE_IS_INCLUDE: | |
2005 | igmpv3_report_isin(igmp, from, rec_group, | |
2006 | rec_num_sources, | |
2007 | (struct in_addr *)sources); | |
2008 | break; | |
2009 | case IGMP_GRP_REC_TYPE_MODE_IS_EXCLUDE: | |
2010 | igmpv3_report_isex( | |
2011 | igmp, from, rec_group, rec_num_sources, | |
2012 | (struct in_addr *)sources, 0); | |
2013 | break; | |
2014 | case IGMP_GRP_REC_TYPE_CHANGE_TO_INCLUDE_MODE: | |
2015 | igmpv3_report_toin(igmp, from, rec_group, | |
2016 | rec_num_sources, | |
2017 | (struct in_addr *)sources); | |
2018 | break; | |
2019 | case IGMP_GRP_REC_TYPE_CHANGE_TO_EXCLUDE_MODE: | |
2020 | igmpv3_report_toex(igmp, from, rec_group, | |
2021 | rec_num_sources, | |
2022 | (struct in_addr *)sources); | |
2023 | break; | |
2024 | case IGMP_GRP_REC_TYPE_ALLOW_NEW_SOURCES: | |
2025 | igmpv3_report_allow(igmp, from, rec_group, | |
2026 | rec_num_sources, | |
2027 | (struct in_addr *)sources); | |
2028 | break; | |
2029 | case IGMP_GRP_REC_TYPE_BLOCK_OLD_SOURCES: | |
2030 | igmpv3_report_block(igmp, from, rec_group, | |
2031 | rec_num_sources, | |
2032 | (struct in_addr *)sources); | |
2033 | break; | |
2034 | default: | |
2035 | zlog_warn( | |
2036 | "Recv IGMP report v3 from %s on %s: unknown record type: type=%d", | |
2037 | from_str, ifp->name, rec_type); | |
2038 | } | |
2039 | ||
2040 | group_record += | |
2041 | 8 + (rec_num_sources << 2) + (rec_auxdatalen << 2); | |
2042 | local_ncb = 0; | |
2043 | ||
2044 | } /* for (group records) */ | |
2045 | ||
2046 | return 0; | |
12e41d03 | 2047 | } |