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Commit | Line | Data |
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12e41d03 | 1 | /* |
896014f4 DL |
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 | */ | |
12e41d03 DL |
19 | |
20 | #include <zebra.h> | |
21 | #include "log.h" | |
22 | #include "memory.h" | |
744d91b3 | 23 | #include "if.h" |
3613d898 | 24 | #include "lib_errors.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 | ||
d62a17ae | 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 | { | |
d62a17ae | 47 | if (PIM_DEBUG_IGMP_TRACE) { |
48 | char from_str[INET_ADDRSTRLEN]; | |
49 | char group_str[INET_ADDRSTRLEN]; | |
12e41d03 | 50 | |
d62a17ae | 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 | |
d62a17ae | 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 | ||
dda4d23c DL |
60 | static inline long igmp_gmi_msec(struct igmp_group *group) |
61 | { | |
62 | struct pim_interface *pim_ifp = group->interface->info; | |
63 | struct igmp_sock *igmp; | |
64 | struct listnode *sock_node; | |
65 | ||
66 | long qrv = 0, qqi = 0; | |
67 | ||
68 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->igmp_socket_list, sock_node, igmp)) { | |
69 | qrv = MAX(qrv, igmp->querier_robustness_variable); | |
70 | qqi = MAX(qqi, igmp->querier_query_interval); | |
71 | } | |
72 | return PIM_IGMP_GMI_MSEC(qrv, qqi, | |
73 | pim_ifp->igmp_query_max_response_time_dsec); | |
74 | } | |
75 | ||
12e41d03 DL |
76 | void igmp_group_reset_gmi(struct igmp_group *group) |
77 | { | |
d62a17ae | 78 | long group_membership_interval_msec; |
d62a17ae | 79 | struct interface *ifp; |
80 | ||
dda4d23c | 81 | ifp = group->interface; |
d62a17ae | 82 | |
83 | /* | |
84 | RFC 3376: 8.4. Group Membership Interval | |
85 | ||
86 | The Group Membership Interval is the amount of time that must pass | |
87 | before a multicast router decides there are no more members of a | |
88 | group or a particular source on a network. | |
89 | ||
90 | This value MUST be ((the Robustness Variable) times (the Query | |
91 | Interval)) plus (one Query Response Interval). | |
92 | ||
93 | group_membership_interval_msec = querier_robustness_variable * | |
94 | (1000 * querier_query_interval) + | |
95 | 100 * query_response_interval_dsec; | |
96 | */ | |
dda4d23c | 97 | group_membership_interval_msec = igmp_gmi_msec(group); |
d62a17ae | 98 | |
99 | if (PIM_DEBUG_IGMP_TRACE) { | |
100 | char group_str[INET_ADDRSTRLEN]; | |
101 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
102 | sizeof(group_str)); | |
103 | zlog_debug( | |
104 | "Resetting group %s timer to GMI=%ld.%03ld sec on %s", | |
105 | group_str, group_membership_interval_msec / 1000, | |
106 | group_membership_interval_msec % 1000, ifp->name); | |
107 | } | |
108 | ||
109 | /* | |
110 | RFC 3376: 6.2.2. Definition of Group Timers | |
111 | ||
112 | The group timer is only used when a group is in EXCLUDE mode and | |
113 | it represents the time for the *filter-mode* of the group to | |
114 | expire and switch to INCLUDE mode. | |
115 | */ | |
df5dfb77 | 116 | assert(group->group_filtermode_isexcl); |
d62a17ae | 117 | |
118 | igmp_group_timer_on(group, group_membership_interval_msec, ifp->name); | |
12e41d03 DL |
119 | } |
120 | ||
121 | static int igmp_source_timer(struct thread *t) | |
122 | { | |
d62a17ae | 123 | struct igmp_source *source; |
124 | struct igmp_group *group; | |
125 | ||
126 | source = THREAD_ARG(t); | |
127 | ||
128 | group = source->source_group; | |
129 | ||
130 | if (PIM_DEBUG_IGMP_TRACE) { | |
131 | char group_str[INET_ADDRSTRLEN]; | |
132 | char source_str[INET_ADDRSTRLEN]; | |
133 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
134 | sizeof(group_str)); | |
135 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
136 | sizeof(source_str)); | |
137 | zlog_debug( | |
138 | "%s: Source timer expired for group %s source %s on %s", | |
15569c58 | 139 | __func__, group_str, source_str, |
dda4d23c | 140 | group->interface->name); |
d62a17ae | 141 | } |
142 | ||
143 | /* | |
144 | RFC 3376: 6.3. IGMPv3 Source-Specific Forwarding Rules | |
145 | ||
146 | Group | |
147 | Filter-Mode Source Timer Value Action | |
148 | ----------- ------------------ ------ | |
149 | INCLUDE TIMER == 0 Suggest to stop forwarding | |
150 | traffic from source and | |
151 | remove source record. If | |
152 | there are no more source | |
153 | records for the group, delete | |
154 | group record. | |
155 | ||
156 | EXCLUDE TIMER == 0 Suggest to not forward | |
157 | traffic from source | |
158 | (DO NOT remove record) | |
159 | ||
160 | Source timer switched from (T > 0) to (T == 0): disable forwarding. | |
161 | */ | |
162 | ||
163 | if (group->group_filtermode_isexcl) { | |
164 | /* EXCLUDE mode */ | |
165 | ||
166 | igmp_source_forward_stop(source); | |
167 | } else { | |
168 | /* INCLUDE mode */ | |
169 | ||
170 | /* igmp_source_delete() will stop forwarding source */ | |
171 | igmp_source_delete(source); | |
172 | ||
173 | /* | |
174 | If there are no more source records for the group, delete | |
175 | group | |
176 | record. | |
177 | */ | |
178 | if (!listcount(group->group_source_list)) { | |
179 | igmp_group_delete_empty_include(group); | |
180 | } | |
181 | } | |
182 | ||
183 | return 0; | |
12e41d03 DL |
184 | } |
185 | ||
186 | static void source_timer_off(struct igmp_group *group, | |
187 | struct igmp_source *source) | |
188 | { | |
d62a17ae | 189 | if (!source->t_source_timer) |
190 | return; | |
191 | ||
192 | if (PIM_DEBUG_IGMP_TRACE) { | |
193 | char group_str[INET_ADDRSTRLEN]; | |
194 | char source_str[INET_ADDRSTRLEN]; | |
195 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
196 | sizeof(group_str)); | |
197 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
198 | sizeof(source_str)); | |
199 | zlog_debug( | |
200 | "Cancelling TIMER event for group %s source %s on %s", | |
a1a4295a | 201 | group_str, source_str, group->interface->name); |
d62a17ae | 202 | } |
203 | ||
204 | THREAD_OFF(source->t_source_timer); | |
12e41d03 DL |
205 | } |
206 | ||
207 | static void igmp_source_timer_on(struct igmp_group *group, | |
d62a17ae | 208 | struct igmp_source *source, long interval_msec) |
12e41d03 | 209 | { |
d62a17ae | 210 | source_timer_off(group, source); |
dda4d23c | 211 | struct pim_interface *pim_ifp = group->interface->info; |
d62a17ae | 212 | |
213 | if (PIM_DEBUG_IGMP_EVENTS) { | |
214 | char group_str[INET_ADDRSTRLEN]; | |
215 | char source_str[INET_ADDRSTRLEN]; | |
216 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
217 | sizeof(group_str)); | |
218 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
219 | sizeof(source_str)); | |
220 | zlog_debug( | |
221 | "Scheduling %ld.%03ld sec TIMER event for group %s source %s on %s", | |
222 | interval_msec / 1000, interval_msec % 1000, group_str, | |
dda4d23c | 223 | source_str, group->interface->name); |
d62a17ae | 224 | } |
225 | ||
36417fcc DS |
226 | thread_add_timer_msec(router->master, igmp_source_timer, source, |
227 | interval_msec, &source->t_source_timer); | |
d62a17ae | 228 | |
229 | /* | |
230 | RFC 3376: 6.3. IGMPv3 Source-Specific Forwarding Rules | |
231 | ||
232 | Source timer switched from (T == 0) to (T > 0): enable forwarding. | |
233 | */ | |
e52e3223 | 234 | igmp_source_forward_start(pim_ifp->pim, source); |
12e41d03 DL |
235 | } |
236 | ||
dda4d23c | 237 | void igmp_source_reset_gmi(struct igmp_group *group, struct igmp_source *source) |
12e41d03 | 238 | { |
d62a17ae | 239 | long group_membership_interval_msec; |
d62a17ae | 240 | struct interface *ifp; |
241 | ||
dda4d23c | 242 | ifp = group->interface; |
d62a17ae | 243 | |
dda4d23c | 244 | group_membership_interval_msec = igmp_gmi_msec(group); |
d62a17ae | 245 | |
246 | if (PIM_DEBUG_IGMP_TRACE) { | |
247 | char group_str[INET_ADDRSTRLEN]; | |
248 | char source_str[INET_ADDRSTRLEN]; | |
249 | ||
250 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
251 | sizeof(group_str)); | |
252 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
253 | sizeof(source_str)); | |
254 | ||
255 | zlog_debug( | |
256 | "Resetting source %s timer to GMI=%ld.%03ld sec for group %s on %s", | |
257 | source_str, group_membership_interval_msec / 1000, | |
258 | group_membership_interval_msec % 1000, group_str, | |
259 | ifp->name); | |
260 | } | |
261 | ||
262 | igmp_source_timer_on(group, source, group_membership_interval_msec); | |
12e41d03 DL |
263 | } |
264 | ||
d2ccd60b | 265 | static void source_mark_delete_flag(struct igmp_group *group) |
12e41d03 | 266 | { |
d62a17ae | 267 | struct listnode *src_node; |
268 | struct igmp_source *src; | |
12e41d03 | 269 | |
d62a17ae | 270 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { |
271 | IGMP_SOURCE_DO_DELETE(src->source_flags); | |
272 | } | |
12e41d03 DL |
273 | } |
274 | ||
d62a17ae | 275 | static void source_mark_send_flag(struct igmp_group *group) |
12e41d03 | 276 | { |
d62a17ae | 277 | struct listnode *src_node; |
278 | struct igmp_source *src; | |
12e41d03 | 279 | |
d62a17ae | 280 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { |
281 | IGMP_SOURCE_DO_SEND(src->source_flags); | |
282 | } | |
12e41d03 DL |
283 | } |
284 | ||
d62a17ae | 285 | static int source_mark_send_flag_by_timer(struct igmp_group *group) |
12e41d03 | 286 | { |
d62a17ae | 287 | struct listnode *src_node; |
288 | struct igmp_source *src; | |
289 | int num_marked_sources = 0; | |
290 | ||
291 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { | |
292 | /* Is source timer running? */ | |
293 | if (src->t_source_timer) { | |
294 | IGMP_SOURCE_DO_SEND(src->source_flags); | |
295 | ++num_marked_sources; | |
296 | } else { | |
297 | IGMP_SOURCE_DONT_SEND(src->source_flags); | |
298 | } | |
299 | } | |
300 | ||
301 | return num_marked_sources; | |
12e41d03 DL |
302 | } |
303 | ||
304 | static void source_clear_send_flag(struct list *source_list) | |
305 | { | |
d62a17ae | 306 | struct listnode *src_node; |
307 | struct igmp_source *src; | |
12e41d03 | 308 | |
d62a17ae | 309 | for (ALL_LIST_ELEMENTS_RO(source_list, src_node, src)) { |
310 | IGMP_SOURCE_DONT_SEND(src->source_flags); | |
311 | } | |
12e41d03 DL |
312 | } |
313 | ||
314 | /* | |
315 | Any source (*,G) is forwarded only if mode is EXCLUDE {empty} | |
316 | */ | |
317 | static void group_exclude_fwd_anysrc_ifempty(struct igmp_group *group) | |
318 | { | |
dda4d23c | 319 | struct pim_interface *pim_ifp = group->interface->info; |
e52e3223 | 320 | |
df5dfb77 | 321 | assert(group->group_filtermode_isexcl); |
12e41d03 | 322 | |
d62a17ae | 323 | if (listcount(group->group_source_list) < 1) { |
e52e3223 | 324 | igmp_anysource_forward_start(pim_ifp->pim, group); |
d62a17ae | 325 | } |
12e41d03 DL |
326 | } |
327 | ||
328 | void igmp_source_free(struct igmp_source *source) | |
329 | { | |
d62a17ae | 330 | /* make sure there is no source timer running */ |
df5dfb77 | 331 | assert(!source->t_source_timer); |
12e41d03 | 332 | |
d62a17ae | 333 | XFREE(MTYPE_PIM_IGMP_GROUP_SOURCE, source); |
12e41d03 DL |
334 | } |
335 | ||
336 | static void source_channel_oil_detach(struct igmp_source *source) | |
337 | { | |
d62a17ae | 338 | if (source->source_channel_oil) { |
15569c58 | 339 | pim_channel_oil_del(source->source_channel_oil, __func__); |
d62a17ae | 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 | { | |
d62a17ae | 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( | |
dda4d23c | 363 | "Deleting IGMP source %s for group %s from interface %s c_oil ref_count %d", |
a1a4295a | 364 | source_str, group_str, group->interface->name, |
d62a17ae | 365 | source->source_channel_oil |
366 | ? source->source_channel_oil->oil_ref_count | |
367 | : 0); | |
368 | } | |
369 | ||
370 | source_timer_off(group, source); | |
371 | igmp_source_forward_stop(source); | |
372 | ||
373 | /* sanity check that forwarding has been disabled */ | |
374 | if (IGMP_SOURCE_TEST_FORWARDING(source->source_flags)) { | |
375 | char group_str[INET_ADDRSTRLEN]; | |
376 | char source_str[INET_ADDRSTRLEN]; | |
377 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
378 | sizeof(group_str)); | |
379 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
380 | sizeof(source_str)); | |
381 | zlog_warn( | |
dda4d23c | 382 | "%s: forwarding=ON(!) IGMP source %s for group %s from interface %s", |
15569c58 | 383 | __func__, source_str, group_str, |
dda4d23c | 384 | group->interface->name); |
d62a17ae | 385 | /* warning only */ |
386 | } | |
387 | ||
388 | source_channel_oil_detach(source); | |
389 | ||
390 | /* | |
391 | notice that listnode_delete() can't be moved | |
392 | into igmp_source_free() because the later is | |
393 | called by list_delete_all_node() | |
394 | */ | |
395 | listnode_delete(group->group_source_list, source); | |
396 | ||
397 | src.s_addr = source->source_addr.s_addr; | |
398 | igmp_source_free(source); | |
399 | ||
400 | /* Group source list is empty and current source is * then | |
401 | *,G group going away so do not trigger start */ | |
402 | if (group->group_filtermode_isexcl | |
403 | && (listcount(group->group_source_list) != 0) | |
404 | && src.s_addr != INADDR_ANY) { | |
405 | group_exclude_fwd_anysrc_ifempty(group); | |
406 | } | |
12e41d03 DL |
407 | } |
408 | ||
409 | static void source_delete_by_flag(struct list *source_list) | |
410 | { | |
d62a17ae | 411 | struct listnode *src_node; |
412 | struct listnode *src_nextnode; | |
413 | struct igmp_source *src; | |
414 | ||
415 | for (ALL_LIST_ELEMENTS(source_list, src_node, src_nextnode, src)) | |
416 | if (IGMP_SOURCE_TEST_DELETE(src->source_flags)) | |
417 | igmp_source_delete(src); | |
12e41d03 DL |
418 | } |
419 | ||
420 | void igmp_source_delete_expired(struct list *source_list) | |
421 | { | |
d62a17ae | 422 | struct listnode *src_node; |
423 | struct listnode *src_nextnode; | |
424 | struct igmp_source *src; | |
425 | ||
426 | for (ALL_LIST_ELEMENTS(source_list, src_node, src_nextnode, src)) | |
427 | if (!src->t_source_timer) | |
428 | igmp_source_delete(src); | |
12e41d03 DL |
429 | } |
430 | ||
431 | struct igmp_source *igmp_find_source_by_addr(struct igmp_group *group, | |
432 | struct in_addr src_addr) | |
433 | { | |
d62a17ae | 434 | struct listnode *src_node; |
435 | struct igmp_source *src; | |
12e41d03 | 436 | |
d62a17ae | 437 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) |
438 | if (src_addr.s_addr == src->source_addr.s_addr) | |
439 | return src; | |
12e41d03 | 440 | |
d62a17ae | 441 | return 0; |
12e41d03 DL |
442 | } |
443 | ||
d62a17ae | 444 | struct igmp_source *source_new(struct igmp_group *group, |
445 | struct in_addr src_addr) | |
12e41d03 | 446 | { |
d62a17ae | 447 | struct igmp_source *src; |
448 | ||
449 | if (PIM_DEBUG_IGMP_TRACE) { | |
450 | char group_str[INET_ADDRSTRLEN]; | |
451 | char source_str[INET_ADDRSTRLEN]; | |
452 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
453 | sizeof(group_str)); | |
454 | pim_inet4_dump("<source?>", src_addr, source_str, | |
455 | sizeof(source_str)); | |
456 | zlog_debug( | |
dda4d23c DL |
457 | "Creating new IGMP source %s for group %s on interface %s", |
458 | source_str, group_str, group->interface->name); | |
d62a17ae | 459 | } |
460 | ||
461 | src = XCALLOC(MTYPE_PIM_IGMP_GROUP_SOURCE, sizeof(*src)); | |
d62a17ae | 462 | |
463 | src->t_source_timer = NULL; | |
464 | src->source_group = group; /* back pointer */ | |
465 | src->source_addr = src_addr; | |
466 | src->source_creation = pim_time_monotonic_sec(); | |
467 | src->source_flags = 0; | |
468 | src->source_query_retransmit_count = 0; | |
469 | src->source_channel_oil = NULL; | |
470 | ||
471 | listnode_add(group->group_source_list, src); | |
472 | ||
473 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
474 | igmp_anysource_forward_stop(group); | |
475 | ||
476 | return src; | |
12e41d03 DL |
477 | } |
478 | ||
479 | static struct igmp_source *add_source_by_addr(struct igmp_sock *igmp, | |
480 | struct igmp_group *group, | |
9bd7302f | 481 | struct in_addr src_addr) |
12e41d03 | 482 | { |
d62a17ae | 483 | struct igmp_source *src; |
12e41d03 | 484 | |
d62a17ae | 485 | src = igmp_find_source_by_addr(group, src_addr); |
486 | if (src) { | |
487 | return src; | |
488 | } | |
12e41d03 | 489 | |
d62a17ae | 490 | src = source_new(group, src_addr); |
12e41d03 | 491 | |
d62a17ae | 492 | return src; |
12e41d03 DL |
493 | } |
494 | ||
495 | static void allow(struct igmp_sock *igmp, struct in_addr from, | |
d62a17ae | 496 | struct in_addr group_addr, int num_sources, |
497 | struct in_addr *sources) | |
12e41d03 | 498 | { |
d62a17ae | 499 | struct igmp_source *source; |
500 | struct igmp_group *group; | |
501 | int i; | |
502 | ||
fcf5d438 SG |
503 | if (num_sources == 0) { |
504 | /* | |
505 | RFC 3376: 3.1. Socket-State | |
506 | If the requested filter mode is INCLUDE *and* the requested | |
507 | source list is empty, then the entry corresponding to the | |
508 | requested interface and multicast address is deleted if | |
509 | present. If no such entry is present, the request is ignored. | |
510 | So, deleting the group present. | |
511 | */ | |
512 | group = find_group_by_addr(igmp, group_addr); | |
26d0cbbb JAG |
513 | if (!group) { |
514 | return; | |
515 | } | |
516 | if (group->group_filtermode_isexcl) { | |
517 | if (listcount(group->group_source_list) == 1) { | |
518 | struct in_addr star = {.s_addr = INADDR_ANY}; | |
519 | ||
520 | source = igmp_find_source_by_addr(group, star); | |
521 | if (source) | |
dda4d23c | 522 | igmp_source_reset_gmi(group, source); |
26d0cbbb JAG |
523 | } |
524 | } else { | |
fcf5d438 | 525 | igmp_group_delete(group); |
26d0cbbb JAG |
526 | } |
527 | ||
fcf5d438 SG |
528 | return; |
529 | } | |
530 | ||
d62a17ae | 531 | /* non-existant group is created as INCLUDE {empty} */ |
532 | group = igmp_add_group_by_addr(igmp, group_addr); | |
533 | if (!group) { | |
534 | return; | |
535 | } | |
536 | ||
537 | /* scan received sources */ | |
538 | for (i = 0; i < num_sources; ++i) { | |
539 | struct in_addr *src_addr; | |
540 | ||
541 | src_addr = sources + i; | |
542 | ||
543 | source = add_source_by_addr(igmp, group, *src_addr); | |
544 | if (!source) { | |
545 | continue; | |
546 | } | |
547 | ||
548 | /* | |
549 | RFC 3376: 6.4.1. Reception of Current-State Records | |
550 | ||
551 | When receiving IS_IN reports for groups in EXCLUDE mode is | |
552 | sources should be moved from set with (timers = 0) to set with | |
553 | (timers > 0). | |
554 | ||
555 | igmp_source_reset_gmi() below, resetting the source timers to | |
556 | GMI, accomplishes this. | |
557 | */ | |
dda4d23c | 558 | igmp_source_reset_gmi(group, source); |
d62a17ae | 559 | |
560 | } /* scan received sources */ | |
12e41d03 DL |
561 | } |
562 | ||
563 | void igmpv3_report_isin(struct igmp_sock *igmp, struct in_addr from, | |
d62a17ae | 564 | struct in_addr group_addr, int num_sources, |
565 | struct in_addr *sources) | |
12e41d03 | 566 | { |
15569c58 DA |
567 | on_trace(__func__, igmp->interface, from, group_addr, num_sources, |
568 | sources); | |
12e41d03 | 569 | |
d62a17ae | 570 | allow(igmp, from, group_addr, num_sources, sources); |
12e41d03 DL |
571 | } |
572 | ||
d62a17ae | 573 | static void isex_excl(struct igmp_group *group, int num_sources, |
574 | struct in_addr *sources) | |
12e41d03 | 575 | { |
d62a17ae | 576 | struct igmp_source *source; |
577 | int i; | |
578 | ||
579 | /* EXCLUDE mode */ | |
df5dfb77 | 580 | assert(group->group_filtermode_isexcl); |
d62a17ae | 581 | |
582 | /* E.1: set deletion flag for known sources (X,Y) */ | |
583 | source_mark_delete_flag(group); | |
584 | ||
585 | /* scan received sources (A) */ | |
586 | for (i = 0; i < num_sources; ++i) { | |
587 | struct in_addr *src_addr; | |
588 | ||
589 | src_addr = sources + i; | |
590 | ||
591 | /* E.2: lookup reported source from (A) in (X,Y) */ | |
592 | source = igmp_find_source_by_addr(group, *src_addr); | |
593 | if (source) { | |
594 | /* E.3: if found, clear deletion flag: (X*A) or (Y*A) */ | |
595 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
596 | } else { | |
597 | /* E.4: if not found, create source with timer=GMI: | |
598 | * (A-X-Y) */ | |
599 | source = source_new(group, *src_addr); | |
df5dfb77 | 600 | assert(!source->t_source_timer); /* timer == 0 */ |
dda4d23c | 601 | igmp_source_reset_gmi(group, source); |
df5dfb77 | 602 | assert(source->t_source_timer); /* (A-X-Y) timer > 0 */ |
d62a17ae | 603 | } |
604 | ||
605 | } /* scan received sources */ | |
606 | ||
607 | /* | |
608 | * If we are in isexcl mode and num_sources == 0 | |
609 | * than that means we have a *,g entry that | |
610 | * needs to be handled | |
611 | */ | |
612 | if (group->group_filtermode_isexcl && num_sources == 0) { | |
613 | struct in_addr star = {.s_addr = INADDR_ANY}; | |
614 | source = igmp_find_source_by_addr(group, star); | |
615 | if (source) { | |
616 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
dda4d23c | 617 | igmp_source_reset_gmi(group, source); |
d62a17ae | 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 | ||
d62a17ae | 625 | static void isex_incl(struct igmp_group *group, int num_sources, |
626 | struct in_addr *sources) | |
12e41d03 | 627 | { |
d62a17ae | 628 | int i; |
629 | ||
630 | /* INCLUDE mode */ | |
df5dfb77 | 631 | assert(!group->group_filtermode_isexcl); |
d62a17ae | 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); | |
df5dfb77 | 652 | assert(!source->t_source_timer); /* (B-A) timer=0 */ |
d62a17ae | 653 | } |
654 | ||
655 | } /* scan received sources */ | |
656 | ||
657 | /* I.5: delete all sources marked with deletion flag (A-B) */ | |
658 | source_delete_by_flag(group->group_source_list); | |
659 | ||
660 | group->group_filtermode_isexcl = 1; /* boolean=true */ | |
661 | ||
df5dfb77 | 662 | assert(group->group_filtermode_isexcl); |
d62a17ae | 663 | |
664 | group_exclude_fwd_anysrc_ifempty(group); | |
12e41d03 DL |
665 | } |
666 | ||
667 | void igmpv3_report_isex(struct igmp_sock *igmp, struct in_addr from, | |
d62a17ae | 668 | struct in_addr group_addr, int num_sources, |
669 | struct in_addr *sources, int from_igmp_v2_report) | |
12e41d03 | 670 | { |
d62a17ae | 671 | struct interface *ifp = igmp->interface; |
672 | struct igmp_group *group; | |
673 | ||
15569c58 | 674 | on_trace(__func__, ifp, from, group_addr, num_sources, sources); |
d62a17ae | 675 | |
b0f525a8 QY |
676 | if (pim_is_group_filtered(ifp->info, &group_addr)) |
677 | return; | |
678 | ||
d62a17ae | 679 | /* non-existant group is created as INCLUDE {empty} */ |
680 | group = igmp_add_group_by_addr(igmp, group_addr); | |
681 | if (!group) { | |
682 | return; | |
683 | } | |
684 | ||
685 | /* So we can display how we learned the group in our show command output | |
686 | */ | |
687 | if (from_igmp_v2_report) | |
688 | group->igmp_version = 2; | |
689 | ||
690 | if (group->group_filtermode_isexcl) { | |
691 | /* EXCLUDE mode */ | |
692 | isex_excl(group, num_sources, sources); | |
693 | } else { | |
694 | /* INCLUDE mode */ | |
695 | isex_incl(group, num_sources, sources); | |
df5dfb77 | 696 | assert(group->group_filtermode_isexcl); |
d62a17ae | 697 | } |
698 | ||
df5dfb77 | 699 | assert(group->group_filtermode_isexcl); |
d62a17ae | 700 | |
701 | igmp_group_reset_gmi(group); | |
12e41d03 DL |
702 | } |
703 | ||
d62a17ae | 704 | static void toin_incl(struct igmp_group *group, int num_sources, |
705 | struct in_addr *sources) | |
12e41d03 | 706 | { |
d62a17ae | 707 | int num_sources_tosend = listcount(group->group_source_list); |
708 | int i; | |
709 | ||
710 | /* Set SEND flag for all known sources (A) */ | |
711 | source_mark_send_flag(group); | |
712 | ||
713 | /* Scan received sources (B) */ | |
714 | for (i = 0; i < num_sources; ++i) { | |
715 | struct igmp_source *source; | |
716 | struct in_addr *src_addr; | |
717 | ||
718 | src_addr = sources + i; | |
719 | ||
720 | /* Lookup reported source (B) */ | |
721 | source = igmp_find_source_by_addr(group, *src_addr); | |
722 | if (source) { | |
723 | /* If found, clear SEND flag (A*B) */ | |
724 | IGMP_SOURCE_DONT_SEND(source->source_flags); | |
725 | --num_sources_tosend; | |
726 | } else { | |
727 | /* If not found, create new source */ | |
728 | source = source_new(group, *src_addr); | |
d62a17ae | 729 | } |
730 | ||
731 | /* (B)=GMI */ | |
dda4d23c | 732 | igmp_source_reset_gmi(group, source); |
d62a17ae | 733 | } |
734 | ||
735 | /* Send sources marked with SEND flag: Q(G,A-B) */ | |
736 | if (num_sources_tosend > 0) { | |
737 | source_query_send_by_flag(group, num_sources_tosend); | |
738 | } | |
12e41d03 DL |
739 | } |
740 | ||
d62a17ae | 741 | static void toin_excl(struct igmp_group *group, int num_sources, |
742 | struct in_addr *sources) | |
12e41d03 | 743 | { |
d62a17ae | 744 | int num_sources_tosend; |
745 | int i; | |
746 | ||
747 | /* Set SEND flag for X (sources with timer > 0) */ | |
748 | num_sources_tosend = source_mark_send_flag_by_timer(group); | |
749 | ||
750 | /* Scan received sources (A) */ | |
751 | for (i = 0; i < num_sources; ++i) { | |
752 | struct igmp_source *source; | |
753 | struct in_addr *src_addr; | |
754 | ||
755 | src_addr = sources + i; | |
756 | ||
757 | /* Lookup reported source (A) */ | |
758 | source = igmp_find_source_by_addr(group, *src_addr); | |
759 | if (source) { | |
760 | if (source->t_source_timer) { | |
761 | /* If found and timer running, clear SEND flag | |
762 | * (X*A) */ | |
763 | IGMP_SOURCE_DONT_SEND(source->source_flags); | |
764 | --num_sources_tosend; | |
765 | } | |
766 | } else { | |
767 | /* If not found, create new source */ | |
768 | source = source_new(group, *src_addr); | |
d62a17ae | 769 | } |
770 | ||
771 | /* (A)=GMI */ | |
dda4d23c | 772 | igmp_source_reset_gmi(group, source); |
d62a17ae | 773 | } |
774 | ||
775 | /* Send sources marked with SEND flag: Q(G,X-A) */ | |
776 | if (num_sources_tosend > 0) { | |
777 | source_query_send_by_flag(group, num_sources_tosend); | |
778 | } | |
779 | ||
780 | /* Send Q(G) */ | |
781 | group_query_send(group); | |
12e41d03 DL |
782 | } |
783 | ||
784 | void igmpv3_report_toin(struct igmp_sock *igmp, struct in_addr from, | |
d62a17ae | 785 | struct in_addr group_addr, int num_sources, |
786 | struct in_addr *sources) | |
12e41d03 | 787 | { |
d62a17ae | 788 | struct interface *ifp = igmp->interface; |
789 | struct igmp_group *group; | |
790 | ||
15569c58 | 791 | on_trace(__func__, ifp, from, group_addr, num_sources, sources); |
d62a17ae | 792 | |
793 | /* | |
794 | * If the requested filter mode is INCLUDE *and* the requested source | |
795 | * list is empty, then the entry corresponding to the requested | |
796 | * interface and multicast address is deleted if present. If no such | |
797 | * entry is present, the request is ignored. | |
798 | */ | |
799 | if (num_sources) { | |
800 | /* non-existant group is created as INCLUDE {empty} */ | |
801 | group = igmp_add_group_by_addr(igmp, group_addr); | |
802 | if (!group) { | |
803 | return; | |
804 | } | |
805 | } else { | |
806 | group = find_group_by_addr(igmp, group_addr); | |
807 | if (!group) | |
808 | return; | |
809 | } | |
810 | ||
811 | if (group->group_filtermode_isexcl) { | |
812 | /* EXCLUDE mode */ | |
813 | toin_excl(group, num_sources, sources); | |
814 | } else { | |
815 | /* INCLUDE mode */ | |
816 | toin_incl(group, num_sources, sources); | |
817 | } | |
12e41d03 DL |
818 | } |
819 | ||
d62a17ae | 820 | static void toex_incl(struct igmp_group *group, int num_sources, |
821 | struct in_addr *sources) | |
12e41d03 | 822 | { |
d62a17ae | 823 | int num_sources_tosend = 0; |
824 | int i; | |
825 | ||
df5dfb77 | 826 | assert(!group->group_filtermode_isexcl); |
d62a17ae | 827 | |
828 | /* Set DELETE flag for all known sources (A) */ | |
829 | source_mark_delete_flag(group); | |
830 | ||
831 | /* Clear off SEND flag from all known sources (A) */ | |
832 | source_clear_send_flag(group->group_source_list); | |
833 | ||
834 | /* Scan received sources (B) */ | |
835 | for (i = 0; i < num_sources; ++i) { | |
836 | struct igmp_source *source; | |
837 | struct in_addr *src_addr; | |
838 | ||
839 | src_addr = sources + i; | |
840 | ||
841 | /* Lookup reported source (B) */ | |
842 | source = igmp_find_source_by_addr(group, *src_addr); | |
843 | if (source) { | |
844 | /* If found, clear deletion flag: (A*B) */ | |
845 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
846 | /* and set SEND flag (A*B) */ | |
847 | IGMP_SOURCE_DO_SEND(source->source_flags); | |
848 | ++num_sources_tosend; | |
849 | } else { | |
850 | /* If source not found, create source with timer=0: | |
851 | * (B-A)=0 */ | |
852 | source = source_new(group, *src_addr); | |
df5dfb77 | 853 | assert(!source->t_source_timer); /* (B-A) timer=0 */ |
d62a17ae | 854 | } |
855 | ||
856 | } /* Scan received sources (B) */ | |
857 | ||
858 | group->group_filtermode_isexcl = 1; /* boolean=true */ | |
859 | ||
860 | /* Delete all sources marked with DELETE flag (A-B) */ | |
861 | source_delete_by_flag(group->group_source_list); | |
862 | ||
863 | /* Send sources marked with SEND flag: Q(G,A*B) */ | |
864 | if (num_sources_tosend > 0) { | |
865 | source_query_send_by_flag(group, num_sources_tosend); | |
866 | } | |
867 | ||
df5dfb77 | 868 | assert(group->group_filtermode_isexcl); |
d62a17ae | 869 | |
870 | group_exclude_fwd_anysrc_ifempty(group); | |
12e41d03 DL |
871 | } |
872 | ||
d62a17ae | 873 | static void toex_excl(struct igmp_group *group, int num_sources, |
874 | struct in_addr *sources) | |
12e41d03 | 875 | { |
d62a17ae | 876 | int num_sources_tosend = 0; |
877 | int i; | |
878 | ||
879 | /* set DELETE flag for all known sources (X,Y) */ | |
880 | source_mark_delete_flag(group); | |
881 | ||
882 | /* clear off SEND flag from all known sources (X,Y) */ | |
883 | source_clear_send_flag(group->group_source_list); | |
884 | ||
885 | if (num_sources == 0) { | |
886 | struct igmp_source *source; | |
887 | struct in_addr any = {.s_addr = INADDR_ANY}; | |
888 | ||
889 | source = igmp_find_source_by_addr(group, any); | |
890 | if (source) | |
891 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
892 | } | |
893 | ||
894 | /* scan received sources (A) */ | |
895 | for (i = 0; i < num_sources; ++i) { | |
896 | struct igmp_source *source; | |
897 | struct in_addr *src_addr; | |
898 | ||
899 | src_addr = sources + i; | |
900 | ||
901 | /* lookup reported source (A) in known sources (X,Y) */ | |
902 | source = igmp_find_source_by_addr(group, *src_addr); | |
903 | if (source) { | |
904 | /* if found, clear off DELETE flag from reported source | |
905 | * (A) */ | |
906 | IGMP_SOURCE_DONT_DELETE(source->source_flags); | |
907 | } else { | |
908 | /* if not found, create source with Group Timer: | |
909 | * (A-X-Y)=Group Timer */ | |
910 | long group_timer_msec; | |
911 | source = source_new(group, *src_addr); | |
d62a17ae | 912 | |
df5dfb77 | 913 | assert(!source->t_source_timer); /* timer == 0 */ |
d62a17ae | 914 | group_timer_msec = igmp_group_timer_remain_msec(group); |
915 | igmp_source_timer_on(group, source, group_timer_msec); | |
df5dfb77 | 916 | assert(source->t_source_timer); /* (A-X-Y) timer > 0 */ |
d62a17ae | 917 | |
918 | /* make sure source is created with DELETE flag unset */ | |
df5dfb77 | 919 | assert(!IGMP_SOURCE_TEST_DELETE(source->source_flags)); |
d62a17ae | 920 | } |
921 | ||
922 | /* make sure reported source has DELETE flag unset */ | |
df5dfb77 | 923 | assert(!IGMP_SOURCE_TEST_DELETE(source->source_flags)); |
d62a17ae | 924 | |
925 | if (source->t_source_timer) { | |
926 | /* if source timer>0 mark SEND flag: Q(G,A-Y) */ | |
927 | IGMP_SOURCE_DO_SEND(source->source_flags); | |
928 | ++num_sources_tosend; | |
929 | } | |
930 | ||
931 | } /* scan received sources (A) */ | |
932 | ||
933 | /* | |
934 | delete all sources marked with DELETE flag: | |
935 | Delete (X-A) | |
936 | Delete (Y-A) | |
937 | */ | |
938 | source_delete_by_flag(group->group_source_list); | |
939 | ||
940 | /* send sources marked with SEND flag: Q(G,A-Y) */ | |
941 | if (num_sources_tosend > 0) { | |
942 | source_query_send_by_flag(group, num_sources_tosend); | |
943 | } | |
12e41d03 DL |
944 | } |
945 | ||
946 | void igmpv3_report_toex(struct igmp_sock *igmp, struct in_addr from, | |
d62a17ae | 947 | struct in_addr group_addr, int num_sources, |
948 | struct in_addr *sources) | |
12e41d03 | 949 | { |
d62a17ae | 950 | struct interface *ifp = igmp->interface; |
951 | struct igmp_group *group; | |
952 | ||
15569c58 | 953 | on_trace(__func__, ifp, from, group_addr, num_sources, sources); |
d62a17ae | 954 | |
955 | /* non-existant group is created as INCLUDE {empty} */ | |
956 | group = igmp_add_group_by_addr(igmp, group_addr); | |
957 | if (!group) { | |
958 | return; | |
959 | } | |
960 | ||
961 | if (group->group_filtermode_isexcl) { | |
962 | /* EXCLUDE mode */ | |
963 | toex_excl(group, num_sources, sources); | |
964 | } else { | |
965 | /* INCLUDE mode */ | |
966 | toex_incl(group, num_sources, sources); | |
df5dfb77 | 967 | assert(group->group_filtermode_isexcl); |
d62a17ae | 968 | } |
df5dfb77 | 969 | assert(group->group_filtermode_isexcl); |
d62a17ae | 970 | |
971 | /* Group Timer=GMI */ | |
972 | igmp_group_reset_gmi(group); | |
12e41d03 DL |
973 | } |
974 | ||
975 | void igmpv3_report_allow(struct igmp_sock *igmp, struct in_addr from, | |
d62a17ae | 976 | struct in_addr group_addr, int num_sources, |
977 | struct in_addr *sources) | |
12e41d03 | 978 | { |
15569c58 DA |
979 | on_trace(__func__, igmp->interface, from, group_addr, num_sources, |
980 | sources); | |
12e41d03 | 981 | |
d62a17ae | 982 | allow(igmp, from, group_addr, num_sources, sources); |
12e41d03 DL |
983 | } |
984 | ||
dda4d23c DL |
985 | static void igmp_send_query_group(struct igmp_group *group, char *query_buf, |
986 | size_t query_buf_size, int num_sources, | |
987 | int s_flag) | |
988 | { | |
989 | struct interface *ifp = group->interface; | |
990 | struct pim_interface *pim_ifp = ifp->info; | |
991 | struct igmp_sock *igmp; | |
992 | struct listnode *sock_node; | |
993 | ||
994 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->igmp_socket_list, sock_node, igmp)) { | |
a1a4295a DL |
995 | igmp_send_query( |
996 | pim_ifp->igmp_version, group, igmp->fd, ifp->name, | |
997 | query_buf, query_buf_size, num_sources, | |
998 | group->group_addr, group->group_addr, | |
999 | pim_ifp->igmp_specific_query_max_response_time_dsec, | |
1000 | s_flag, igmp->querier_robustness_variable, | |
1001 | igmp->querier_query_interval); | |
dda4d23c DL |
1002 | } |
1003 | } | |
1004 | ||
12e41d03 DL |
1005 | /* |
1006 | RFC3376: 6.6.3.1. Building and Sending Group Specific Queries | |
1007 | ||
1008 | When transmitting a group specific query, if the group timer is | |
1009 | larger than LMQT, the "Suppress Router-Side Processing" bit is set | |
1010 | in the query message. | |
1011 | */ | |
1012 | static void group_retransmit_group(struct igmp_group *group) | |
1013 | { | |
d62a17ae | 1014 | struct pim_interface *pim_ifp; |
1015 | long lmqc; /* Last Member Query Count */ | |
1016 | long lmqi_msec; /* Last Member Query Interval */ | |
1017 | long lmqt_msec; /* Last Member Query Time */ | |
1018 | int s_flag; | |
1019 | int query_buf_size; | |
1020 | ||
dda4d23c | 1021 | pim_ifp = group->interface->info; |
d62a17ae | 1022 | |
1023 | if (pim_ifp->igmp_version == 3) { | |
1024 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; | |
1025 | } else { | |
1026 | query_buf_size = IGMP_V12_MSG_SIZE; | |
1027 | } | |
1028 | ||
1029 | char query_buf[query_buf_size]; | |
1030 | ||
59115451 | 1031 | lmqc = pim_ifp->igmp_last_member_query_count; |
d62a17ae | 1032 | lmqi_msec = 100 * pim_ifp->igmp_specific_query_max_response_time_dsec; |
1033 | lmqt_msec = lmqc * lmqi_msec; | |
1034 | ||
1035 | /* | |
1036 | RFC3376: 6.6.3.1. Building and Sending Group Specific Queries | |
1037 | ||
1038 | When transmitting a group specific query, if the group timer is | |
1039 | larger than LMQT, the "Suppress Router-Side Processing" bit is set | |
1040 | in the query message. | |
1041 | */ | |
1042 | s_flag = igmp_group_timer_remain_msec(group) > lmqt_msec; | |
1043 | ||
1044 | if (PIM_DEBUG_IGMP_TRACE) { | |
1045 | char group_str[INET_ADDRSTRLEN]; | |
1046 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1047 | sizeof(group_str)); | |
1048 | zlog_debug( | |
1049 | "retransmit_group_specific_query: group %s on %s: s_flag=%d count=%d", | |
dda4d23c | 1050 | group_str, group->interface->name, s_flag, |
d62a17ae | 1051 | group->group_specific_query_retransmit_count); |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
1056 | ||
1057 | Group-Specific and Group-and-Source-Specific Queries are sent with | |
1058 | an IP destination address equal to the multicast address of | |
1059 | interest. | |
1060 | */ | |
1061 | ||
dda4d23c | 1062 | igmp_send_query_group(group, query_buf, sizeof(query_buf), 0, s_flag); |
12e41d03 DL |
1063 | } |
1064 | ||
1065 | /* | |
1066 | RFC3376: 6.6.3.2. Building and Sending Group and Source Specific Queries | |
1067 | ||
1068 | When building a group and source specific query for a group G, two | |
1069 | separate query messages are sent for the group. The first one has | |
1070 | the "Suppress Router-Side Processing" bit set and contains all the | |
1071 | sources with retransmission state and timers greater than LMQT. The | |
1072 | second has the "Suppress Router-Side Processing" bit clear and | |
1073 | contains all the sources with retransmission state and timers lower | |
1074 | or equal to LMQT. If either of the two calculated messages does not | |
1075 | contain any sources, then its transmission is suppressed. | |
1076 | */ | |
1077 | static int group_retransmit_sources(struct igmp_group *group, | |
1078 | int send_with_sflag_set) | |
1079 | { | |
d62a17ae | 1080 | struct pim_interface *pim_ifp; |
1081 | long lmqc; /* Last Member Query Count */ | |
1082 | long lmqi_msec; /* Last Member Query Interval */ | |
1083 | long lmqt_msec; /* Last Member Query Time */ | |
1084 | char query_buf1[PIM_IGMP_BUFSIZE_WRITE]; /* 1 = with s_flag set */ | |
1085 | char query_buf2[PIM_IGMP_BUFSIZE_WRITE]; /* 2 = with s_flag clear */ | |
1086 | int query_buf1_max_sources; | |
1087 | int query_buf2_max_sources; | |
1088 | struct in_addr *source_addr1; | |
1089 | struct in_addr *source_addr2; | |
1090 | int num_sources_tosend1; | |
1091 | int num_sources_tosend2; | |
1092 | struct listnode *src_node; | |
1093 | struct igmp_source *src; | |
1094 | int num_retransmit_sources_left = 0; | |
1095 | ||
1096 | source_addr1 = (struct in_addr *)(query_buf1 + IGMP_V3_SOURCES_OFFSET); | |
1097 | source_addr2 = (struct in_addr *)(query_buf2 + IGMP_V3_SOURCES_OFFSET); | |
1098 | ||
dda4d23c | 1099 | pim_ifp = group->interface->info; |
d62a17ae | 1100 | |
59115451 | 1101 | lmqc = pim_ifp->igmp_last_member_query_count; |
d62a17ae | 1102 | lmqi_msec = 100 * pim_ifp->igmp_specific_query_max_response_time_dsec; |
1103 | lmqt_msec = lmqc * lmqi_msec; | |
1104 | ||
1105 | /* Scan all group sources */ | |
1106 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { | |
1107 | ||
1108 | /* Source has retransmission state? */ | |
1109 | if (src->source_query_retransmit_count < 1) | |
1110 | continue; | |
1111 | ||
1112 | if (--src->source_query_retransmit_count > 0) { | |
1113 | ++num_retransmit_sources_left; | |
1114 | } | |
1115 | ||
1116 | /* Copy source address into appropriate query buffer */ | |
1117 | if (igmp_source_timer_remain_msec(src) > lmqt_msec) { | |
1118 | *source_addr1 = src->source_addr; | |
1119 | ++source_addr1; | |
1120 | } else { | |
1121 | *source_addr2 = src->source_addr; | |
1122 | ++source_addr2; | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | num_sources_tosend1 = | |
1127 | source_addr1 | |
1128 | - (struct in_addr *)(query_buf1 + IGMP_V3_SOURCES_OFFSET); | |
1129 | num_sources_tosend2 = | |
1130 | source_addr2 | |
1131 | - (struct in_addr *)(query_buf2 + IGMP_V3_SOURCES_OFFSET); | |
1132 | ||
1133 | if (PIM_DEBUG_IGMP_TRACE) { | |
1134 | char group_str[INET_ADDRSTRLEN]; | |
1135 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1136 | sizeof(group_str)); | |
1137 | zlog_debug( | |
1138 | "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", | |
dda4d23c | 1139 | group_str, group->interface->name, num_sources_tosend1, |
d62a17ae | 1140 | num_sources_tosend2, send_with_sflag_set, |
1141 | num_retransmit_sources_left); | |
1142 | } | |
1143 | ||
1144 | if (num_sources_tosend1 > 0) { | |
1145 | /* | |
1146 | Send group-and-source-specific query with s_flag set and all | |
1147 | sources with timers greater than LMQT. | |
1148 | */ | |
1149 | ||
1150 | if (send_with_sflag_set) { | |
1151 | ||
1152 | query_buf1_max_sources = | |
1153 | (sizeof(query_buf1) - IGMP_V3_SOURCES_OFFSET) | |
1154 | >> 2; | |
1155 | if (num_sources_tosend1 > query_buf1_max_sources) { | |
1156 | char group_str[INET_ADDRSTRLEN]; | |
1157 | pim_inet4_dump("<group?>", group->group_addr, | |
1158 | group_str, sizeof(group_str)); | |
1159 | zlog_warn( | |
1160 | "%s: group %s on %s: s_flag=1 unable to fit %d sources into buf_size=%zu (max_sources=%d)", | |
5e81f5dd | 1161 | __func__, group_str, |
dda4d23c | 1162 | group->interface->name, |
d62a17ae | 1163 | num_sources_tosend1, sizeof(query_buf1), |
1164 | query_buf1_max_sources); | |
1165 | } else { | |
1166 | /* | |
1167 | RFC3376: 4.1.12. IP Destination Addresses for | |
1168 | Queries | |
1169 | ||
1170 | Group-Specific and Group-and-Source-Specific | |
1171 | Queries are sent with | |
1172 | an IP destination address equal to the | |
1173 | multicast address of | |
1174 | interest. | |
1175 | */ | |
1176 | ||
a1a4295a DL |
1177 | igmp_send_query_group( |
1178 | group, query_buf1, sizeof(query_buf1), | |
1179 | num_sources_tosend1, 1 /* s_flag */); | |
d62a17ae | 1180 | } |
1181 | ||
1182 | } /* send_with_sflag_set */ | |
1183 | } | |
1184 | ||
1185 | if (num_sources_tosend2 > 0) { | |
1186 | /* | |
1187 | Send group-and-source-specific query with s_flag clear and all | |
1188 | sources with timers lower or equal to LMQT. | |
1189 | */ | |
1190 | ||
1191 | query_buf2_max_sources = | |
1192 | (sizeof(query_buf2) - IGMP_V3_SOURCES_OFFSET) >> 2; | |
1193 | if (num_sources_tosend2 > query_buf2_max_sources) { | |
1194 | char group_str[INET_ADDRSTRLEN]; | |
1195 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1196 | sizeof(group_str)); | |
1197 | zlog_warn( | |
1198 | "%s: group %s on %s: s_flag=0 unable to fit %d sources into buf_size=%zu (max_sources=%d)", | |
dda4d23c | 1199 | __func__, group_str, group->interface->name, |
5e81f5dd DS |
1200 | num_sources_tosend2, sizeof(query_buf2), |
1201 | query_buf2_max_sources); | |
d62a17ae | 1202 | } else { |
1203 | /* | |
1204 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
1205 | ||
1206 | Group-Specific and Group-and-Source-Specific Queries | |
1207 | are sent with | |
1208 | an IP destination address equal to the multicast | |
1209 | address of | |
1210 | interest. | |
1211 | */ | |
1212 | ||
a1a4295a DL |
1213 | igmp_send_query_group( |
1214 | group, query_buf2, sizeof(query_buf2), | |
1215 | num_sources_tosend2, 0 /* s_flag */); | |
d62a17ae | 1216 | } |
1217 | } | |
1218 | ||
1219 | return num_retransmit_sources_left; | |
12e41d03 DL |
1220 | } |
1221 | ||
1222 | static int igmp_group_retransmit(struct thread *t) | |
1223 | { | |
d62a17ae | 1224 | struct igmp_group *group; |
1225 | int num_retransmit_sources_left; | |
1226 | int send_with_sflag_set; /* boolean */ | |
1227 | ||
1228 | group = THREAD_ARG(t); | |
1229 | ||
1230 | if (PIM_DEBUG_IGMP_TRACE) { | |
1231 | char group_str[INET_ADDRSTRLEN]; | |
1232 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1233 | sizeof(group_str)); | |
1234 | zlog_debug("group_retransmit_timer: group %s on %s", group_str, | |
dda4d23c | 1235 | group->interface->name); |
d62a17ae | 1236 | } |
1237 | ||
1238 | /* Retransmit group-specific queries? (RFC3376: 6.6.3.1) */ | |
1239 | if (group->group_specific_query_retransmit_count > 0) { | |
1240 | ||
1241 | /* Retransmit group-specific queries (RFC3376: 6.6.3.1) */ | |
1242 | group_retransmit_group(group); | |
1243 | --group->group_specific_query_retransmit_count; | |
1244 | ||
1245 | /* | |
1246 | RFC3376: 6.6.3.2 | |
1247 | If a group specific query is scheduled to be transmitted at | |
1248 | the | |
1249 | same time as a group and source specific query for the same | |
1250 | group, | |
1251 | then transmission of the group and source specific message | |
1252 | with the | |
1253 | "Suppress Router-Side Processing" bit set may be suppressed. | |
1254 | */ | |
1255 | send_with_sflag_set = 0; /* boolean=false */ | |
1256 | } else { | |
1257 | send_with_sflag_set = 1; /* boolean=true */ | |
1258 | } | |
1259 | ||
1260 | /* Retransmit group-and-source-specific queries (RFC3376: 6.6.3.2) */ | |
1261 | num_retransmit_sources_left = | |
1262 | group_retransmit_sources(group, send_with_sflag_set); | |
1263 | ||
1264 | /* | |
1265 | Keep group retransmit timer running if there is any retransmit | |
1266 | counter pending | |
1267 | */ | |
1268 | if ((num_retransmit_sources_left > 0) | |
1269 | || (group->group_specific_query_retransmit_count > 0)) { | |
1270 | group_retransmit_timer_on(group); | |
1271 | } | |
1272 | ||
1273 | return 0; | |
12e41d03 DL |
1274 | } |
1275 | ||
1276 | /* | |
1277 | group_retransmit_timer_on: | |
1278 | if group retransmit timer isn't running, starts it; | |
1279 | otherwise, do nothing | |
1280 | */ | |
1281 | static void group_retransmit_timer_on(struct igmp_group *group) | |
1282 | { | |
d62a17ae | 1283 | struct pim_interface *pim_ifp; |
1284 | long lmqi_msec; /* Last Member Query Interval */ | |
1285 | ||
1286 | /* if group retransmit timer is running, do nothing */ | |
1287 | if (group->t_group_query_retransmit_timer) { | |
1288 | return; | |
1289 | } | |
1290 | ||
dda4d23c | 1291 | pim_ifp = group->interface->info; |
d62a17ae | 1292 | |
1293 | lmqi_msec = 100 * pim_ifp->igmp_specific_query_max_response_time_dsec; | |
1294 | ||
1295 | if (PIM_DEBUG_IGMP_TRACE) { | |
1296 | char group_str[INET_ADDRSTRLEN]; | |
1297 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1298 | sizeof(group_str)); | |
1299 | zlog_debug( | |
1300 | "Scheduling %ld.%03ld sec retransmit timer for group %s on %s", | |
1301 | lmqi_msec / 1000, lmqi_msec % 1000, group_str, | |
dda4d23c | 1302 | group->interface->name); |
d62a17ae | 1303 | } |
1304 | ||
36417fcc DS |
1305 | thread_add_timer_msec(router->master, igmp_group_retransmit, group, |
1306 | lmqi_msec, | |
d62a17ae | 1307 | &group->t_group_query_retransmit_timer); |
12e41d03 DL |
1308 | } |
1309 | ||
1310 | static long igmp_group_timer_remain_msec(struct igmp_group *group) | |
1311 | { | |
d62a17ae | 1312 | return pim_time_timer_remain_msec(group->t_group_timer); |
12e41d03 DL |
1313 | } |
1314 | ||
1315 | static long igmp_source_timer_remain_msec(struct igmp_source *source) | |
1316 | { | |
d62a17ae | 1317 | return pim_time_timer_remain_msec(source->t_source_timer); |
12e41d03 DL |
1318 | } |
1319 | ||
1320 | /* | |
1321 | RFC3376: 6.6.3.1. Building and Sending Group Specific Queries | |
1322 | */ | |
1323 | static void group_query_send(struct igmp_group *group) | |
1324 | { | |
59115451 | 1325 | struct pim_interface *pim_ifp; |
d62a17ae | 1326 | long lmqc; /* Last Member Query Count */ |
12e41d03 | 1327 | |
dda4d23c | 1328 | pim_ifp = group->interface->info; |
59115451 | 1329 | lmqc = pim_ifp->igmp_last_member_query_count; |
12e41d03 | 1330 | |
d62a17ae | 1331 | /* lower group timer to lmqt */ |
1332 | igmp_group_timer_lower_to_lmqt(group); | |
12e41d03 | 1333 | |
d62a17ae | 1334 | /* reset retransmission counter */ |
1335 | group->group_specific_query_retransmit_count = lmqc; | |
12e41d03 | 1336 | |
d62a17ae | 1337 | /* immediately send group specific query (decrease retransmit counter by |
1338 | * 1)*/ | |
1339 | group_retransmit_group(group); | |
12e41d03 | 1340 | |
d62a17ae | 1341 | /* make sure group retransmit timer is running */ |
1342 | group_retransmit_timer_on(group); | |
12e41d03 DL |
1343 | } |
1344 | ||
1345 | /* | |
1346 | RFC3376: 6.6.3.2. Building and Sending Group and Source Specific Queries | |
1347 | */ | |
1348 | static void source_query_send_by_flag(struct igmp_group *group, | |
1349 | int num_sources_tosend) | |
1350 | { | |
d62a17ae | 1351 | struct pim_interface *pim_ifp; |
1352 | struct listnode *src_node; | |
1353 | struct igmp_source *src; | |
1354 | long lmqc; /* Last Member Query Count */ | |
1355 | long lmqi_msec; /* Last Member Query Interval */ | |
1356 | long lmqt_msec; /* Last Member Query Time */ | |
1357 | ||
df5dfb77 | 1358 | assert(num_sources_tosend > 0); |
d62a17ae | 1359 | |
dda4d23c | 1360 | pim_ifp = group->interface->info; |
d62a17ae | 1361 | |
59115451 | 1362 | lmqc = pim_ifp->igmp_last_member_query_count; |
d62a17ae | 1363 | lmqi_msec = 100 * pim_ifp->igmp_specific_query_max_response_time_dsec; |
1364 | lmqt_msec = lmqc * lmqi_msec; | |
1365 | ||
1366 | /* | |
1367 | RFC3376: 6.6.3.2. Building and Sending Group and Source Specific | |
1368 | Queries | |
1369 | ||
1370 | (...) for each of the sources in X of group G, with source timer | |
1371 | larger | |
1372 | than LMQT: | |
1373 | o Set number of retransmissions for each source to [Last Member | |
1374 | Query Count]. | |
1375 | o Lower source timer to LMQT. | |
1376 | */ | |
1377 | for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) { | |
1378 | if (IGMP_SOURCE_TEST_SEND(src->source_flags)) { | |
1379 | /* source "src" in X of group G */ | |
1380 | if (igmp_source_timer_remain_msec(src) > lmqt_msec) { | |
1381 | src->source_query_retransmit_count = lmqc; | |
1382 | igmp_source_timer_lower_to_lmqt(src); | |
1383 | } | |
1384 | } | |
1385 | } | |
1386 | ||
1387 | /* send group-and-source specific queries */ | |
1388 | group_retransmit_sources(group, 1 /* send_with_sflag_set=true */); | |
1389 | ||
1390 | /* make sure group retransmit timer is running */ | |
1391 | group_retransmit_timer_on(group); | |
12e41d03 DL |
1392 | } |
1393 | ||
d62a17ae | 1394 | static void block_excl(struct igmp_group *group, int num_sources, |
1395 | struct in_addr *sources) | |
12e41d03 | 1396 | { |
d62a17ae | 1397 | int num_sources_tosend = 0; |
1398 | int i; | |
1399 | ||
1400 | /* 1. clear off SEND flag from all known sources (X,Y) */ | |
1401 | source_clear_send_flag(group->group_source_list); | |
1402 | ||
1403 | /* 2. scan received sources (A) */ | |
1404 | for (i = 0; i < num_sources; ++i) { | |
1405 | struct igmp_source *source; | |
1406 | struct in_addr *src_addr; | |
1407 | ||
1408 | src_addr = sources + i; | |
1409 | ||
1410 | /* lookup reported source (A) in known sources (X,Y) */ | |
1411 | source = igmp_find_source_by_addr(group, *src_addr); | |
1412 | if (!source) { | |
1413 | /* 3: if not found, create source with Group Timer: | |
1414 | * (A-X-Y)=Group Timer */ | |
1415 | long group_timer_msec; | |
1416 | source = source_new(group, *src_addr); | |
d62a17ae | 1417 | |
df5dfb77 | 1418 | assert(!source->t_source_timer); /* timer == 0 */ |
d62a17ae | 1419 | group_timer_msec = igmp_group_timer_remain_msec(group); |
1420 | igmp_source_timer_on(group, source, group_timer_msec); | |
df5dfb77 | 1421 | assert(source->t_source_timer); /* (A-X-Y) timer > 0 */ |
d62a17ae | 1422 | } |
1423 | ||
1424 | if (source->t_source_timer) { | |
1425 | /* 4. if source timer>0 mark SEND flag: Q(G,A-Y) */ | |
1426 | IGMP_SOURCE_DO_SEND(source->source_flags); | |
1427 | ++num_sources_tosend; | |
1428 | } | |
1429 | } | |
1430 | ||
1431 | /* 5. send sources marked with SEND flag: Q(G,A-Y) */ | |
1432 | if (num_sources_tosend > 0) { | |
1433 | source_query_send_by_flag(group, num_sources_tosend); | |
1434 | } | |
12e41d03 DL |
1435 | } |
1436 | ||
d62a17ae | 1437 | static void block_incl(struct igmp_group *group, int num_sources, |
1438 | struct in_addr *sources) | |
12e41d03 | 1439 | { |
d62a17ae | 1440 | int num_sources_tosend = 0; |
1441 | int i; | |
1442 | ||
1443 | /* 1. clear off SEND flag from all known sources (B) */ | |
1444 | source_clear_send_flag(group->group_source_list); | |
1445 | ||
1446 | /* 2. scan received sources (A) */ | |
1447 | for (i = 0; i < num_sources; ++i) { | |
1448 | struct igmp_source *source; | |
1449 | struct in_addr *src_addr; | |
1450 | ||
1451 | src_addr = sources + i; | |
1452 | ||
1453 | /* lookup reported source (A) in known sources (B) */ | |
1454 | source = igmp_find_source_by_addr(group, *src_addr); | |
1455 | if (source) { | |
1456 | /* 3. if found (A*B), mark SEND flag: Q(G,A*B) */ | |
1457 | IGMP_SOURCE_DO_SEND(source->source_flags); | |
1458 | ++num_sources_tosend; | |
1459 | } | |
1460 | } | |
1461 | ||
1462 | /* 4. send sources marked with SEND flag: Q(G,A*B) */ | |
1463 | if (num_sources_tosend > 0) { | |
1464 | source_query_send_by_flag(group, num_sources_tosend); | |
1465 | } | |
12e41d03 DL |
1466 | } |
1467 | ||
1468 | void igmpv3_report_block(struct igmp_sock *igmp, struct in_addr from, | |
d62a17ae | 1469 | struct in_addr group_addr, int num_sources, |
1470 | struct in_addr *sources) | |
12e41d03 | 1471 | { |
d62a17ae | 1472 | struct interface *ifp = igmp->interface; |
1473 | struct igmp_group *group; | |
1474 | ||
15569c58 | 1475 | on_trace(__func__, ifp, from, group_addr, num_sources, sources); |
d62a17ae | 1476 | |
1477 | /* non-existant group is created as INCLUDE {empty} */ | |
1478 | group = igmp_add_group_by_addr(igmp, group_addr); | |
1479 | if (!group) { | |
1480 | return; | |
1481 | } | |
1482 | ||
1483 | if (group->group_filtermode_isexcl) { | |
1484 | /* EXCLUDE mode */ | |
1485 | block_excl(group, num_sources, sources); | |
1486 | } else { | |
1487 | /* INCLUDE mode */ | |
1488 | block_incl(group, num_sources, sources); | |
1489 | } | |
12e41d03 DL |
1490 | } |
1491 | ||
1492 | void igmp_group_timer_lower_to_lmqt(struct igmp_group *group) | |
1493 | { | |
d62a17ae | 1494 | struct interface *ifp; |
1495 | struct pim_interface *pim_ifp; | |
1496 | char *ifname; | |
1497 | int lmqi_dsec; /* Last Member Query Interval */ | |
1498 | int lmqc; /* Last Member Query Count */ | |
1499 | int lmqt_msec; /* Last Member Query Time */ | |
1500 | ||
1501 | /* | |
1502 | RFC 3376: 6.2.2. Definition of Group Timers | |
1503 | ||
1504 | The group timer is only used when a group is in EXCLUDE mode and | |
1505 | it represents the time for the *filter-mode* of the group to | |
1506 | expire and switch to INCLUDE mode. | |
1507 | */ | |
1508 | if (!group->group_filtermode_isexcl) { | |
1509 | return; | |
1510 | } | |
1511 | ||
dda4d23c | 1512 | ifp = group->interface; |
d62a17ae | 1513 | pim_ifp = ifp->info; |
1514 | ifname = ifp->name; | |
1515 | ||
1516 | lmqi_dsec = pim_ifp->igmp_specific_query_max_response_time_dsec; | |
59115451 | 1517 | lmqc = pim_ifp->igmp_last_member_query_count; |
d62a17ae | 1518 | lmqt_msec = PIM_IGMP_LMQT_MSEC( |
1519 | lmqi_dsec, lmqc); /* lmqt_msec = (100 * lmqi_dsec) * lmqc */ | |
1520 | ||
1521 | if (PIM_DEBUG_IGMP_TRACE) { | |
1522 | char group_str[INET_ADDRSTRLEN]; | |
1523 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1524 | sizeof(group_str)); | |
1525 | zlog_debug( | |
1526 | "%s: group %s on %s: LMQC=%d LMQI=%d dsec LMQT=%d msec", | |
15569c58 | 1527 | __func__, group_str, ifname, lmqc, lmqi_dsec, |
d62a17ae | 1528 | lmqt_msec); |
1529 | } | |
1530 | ||
df5dfb77 | 1531 | assert(group->group_filtermode_isexcl); |
d62a17ae | 1532 | |
1533 | igmp_group_timer_on(group, lmqt_msec, ifname); | |
12e41d03 DL |
1534 | } |
1535 | ||
1536 | void igmp_source_timer_lower_to_lmqt(struct igmp_source *source) | |
1537 | { | |
d62a17ae | 1538 | struct igmp_group *group; |
d62a17ae | 1539 | struct interface *ifp; |
1540 | struct pim_interface *pim_ifp; | |
1541 | char *ifname; | |
1542 | int lmqi_dsec; /* Last Member Query Interval */ | |
1543 | int lmqc; /* Last Member Query Count */ | |
1544 | int lmqt_msec; /* Last Member Query Time */ | |
1545 | ||
1546 | group = source->source_group; | |
dda4d23c | 1547 | ifp = group->interface; |
d62a17ae | 1548 | pim_ifp = ifp->info; |
1549 | ifname = ifp->name; | |
1550 | ||
1551 | lmqi_dsec = pim_ifp->igmp_specific_query_max_response_time_dsec; | |
59115451 | 1552 | lmqc = pim_ifp->igmp_last_member_query_count; |
d62a17ae | 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 | char source_str[INET_ADDRSTRLEN]; | |
1559 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1560 | sizeof(group_str)); | |
1561 | pim_inet4_dump("<source?>", source->source_addr, source_str, | |
1562 | sizeof(source_str)); | |
1563 | zlog_debug( | |
1564 | "%s: group %s source %s on %s: LMQC=%d LMQI=%d dsec LMQT=%d msec", | |
15569c58 DA |
1565 | __func__, group_str, source_str, ifname, lmqc, |
1566 | lmqi_dsec, lmqt_msec); | |
d62a17ae | 1567 | } |
1568 | ||
1569 | igmp_source_timer_on(group, source, lmqt_msec); | |
12e41d03 DL |
1570 | } |
1571 | ||
d62a17ae | 1572 | void igmp_v3_send_query(struct igmp_group *group, int fd, const char *ifname, |
1573 | char *query_buf, int query_buf_size, int num_sources, | |
1574 | struct in_addr dst_addr, struct in_addr group_addr, | |
1575 | int query_max_response_time_dsec, uint8_t s_flag, | |
1576 | uint8_t querier_robustness_variable, | |
1577 | uint16_t querier_query_interval) | |
12e41d03 | 1578 | { |
d62a17ae | 1579 | ssize_t msg_size; |
1580 | uint8_t max_resp_code; | |
1581 | uint8_t qqic; | |
1582 | ssize_t sent; | |
1583 | struct sockaddr_in to; | |
1584 | socklen_t tolen; | |
1585 | uint16_t checksum; | |
1586 | ||
df5dfb77 | 1587 | assert(num_sources >= 0); |
d62a17ae | 1588 | |
1589 | msg_size = IGMP_V3_SOURCES_OFFSET + (num_sources << 2); | |
1590 | if (msg_size > query_buf_size) { | |
af4c2728 | 1591 | flog_err( |
450971aa | 1592 | EC_LIB_DEVELOPMENT, |
d62a17ae | 1593 | "%s %s: unable to send: msg_size=%zd larger than query_buf_size=%d", |
15569c58 | 1594 | __FILE__, __func__, msg_size, query_buf_size); |
d62a17ae | 1595 | return; |
1596 | } | |
1597 | ||
1598 | s_flag = PIM_FORCE_BOOLEAN(s_flag); | |
df5dfb77 | 1599 | assert((s_flag == 0) || (s_flag == 1)); |
d62a17ae | 1600 | |
1601 | max_resp_code = igmp_msg_encode16to8(query_max_response_time_dsec); | |
1602 | qqic = igmp_msg_encode16to8(querier_query_interval); | |
1603 | ||
1604 | /* | |
1605 | RFC 3376: 4.1.6. QRV (Querier's Robustness Variable) | |
1606 | ||
1607 | If non-zero, the QRV field contains the [Robustness Variable] | |
1608 | value used by the querier, i.e., the sender of the Query. If the | |
1609 | querier's [Robustness Variable] exceeds 7, the maximum value of | |
1610 | the QRV field, the QRV is set to zero. | |
1611 | */ | |
1612 | if (querier_robustness_variable > 7) { | |
1613 | querier_robustness_variable = 0; | |
1614 | } | |
1615 | ||
1616 | query_buf[0] = PIM_IGMP_MEMBERSHIP_QUERY; | |
1617 | query_buf[1] = max_resp_code; | |
1618 | *(uint16_t *)(query_buf + IGMP_CHECKSUM_OFFSET) = | |
1619 | 0; /* for computing checksum */ | |
1620 | memcpy(query_buf + 4, &group_addr, sizeof(struct in_addr)); | |
1621 | ||
1622 | query_buf[8] = (s_flag << 3) | querier_robustness_variable; | |
1623 | query_buf[9] = qqic; | |
1624 | *(uint16_t *)(query_buf + IGMP_V3_NUMSOURCES_OFFSET) = | |
1625 | htons(num_sources); | |
1626 | ||
1627 | checksum = in_cksum(query_buf, msg_size); | |
1628 | *(uint16_t *)(query_buf + IGMP_CHECKSUM_OFFSET) = checksum; | |
1629 | ||
1630 | if (PIM_DEBUG_IGMP_PACKETS) { | |
1631 | char dst_str[INET_ADDRSTRLEN]; | |
1632 | char group_str[INET_ADDRSTRLEN]; | |
1633 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
1634 | pim_inet4_dump("<group?>", group_addr, group_str, | |
1635 | sizeof(group_str)); | |
1636 | zlog_debug( | |
1637 | "Send IGMPv3 query to %s on %s for group %s, sources=%d msg_size=%zd s_flag=%x QRV=%u QQI=%u QQIC=%02x", | |
1638 | dst_str, ifname, group_str, num_sources, msg_size, | |
1639 | s_flag, querier_robustness_variable, | |
1640 | querier_query_interval, qqic); | |
1641 | } | |
1642 | ||
1643 | memset(&to, 0, sizeof(to)); | |
1644 | to.sin_family = AF_INET; | |
1645 | to.sin_addr = dst_addr; | |
1646 | tolen = sizeof(to); | |
1647 | ||
1648 | sent = sendto(fd, query_buf, msg_size, MSG_DONTWAIT, | |
1649 | (struct sockaddr *)&to, tolen); | |
1650 | if (sent != (ssize_t)msg_size) { | |
1651 | char dst_str[INET_ADDRSTRLEN]; | |
1652 | char group_str[INET_ADDRSTRLEN]; | |
1653 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
1654 | pim_inet4_dump("<group?>", group_addr, group_str, | |
1655 | sizeof(group_str)); | |
1656 | if (sent < 0) { | |
1657 | zlog_warn( | |
1658 | "Send IGMPv3 query failed due to %s on %s: group=%s msg_size=%zd: errno=%d: %s", | |
1659 | dst_str, ifname, group_str, msg_size, errno, | |
1660 | safe_strerror(errno)); | |
1661 | } else { | |
1662 | zlog_warn( | |
1663 | "Send IGMPv3 query failed due to %s on %s: group=%s msg_size=%zd: sent=%zd", | |
1664 | dst_str, ifname, group_str, msg_size, sent); | |
1665 | } | |
1666 | return; | |
1667 | } | |
1668 | ||
1669 | /* | |
1670 | s_flag sanity test: s_flag must be set for general queries | |
1671 | ||
1672 | RFC 3376: 6.6.1. Timer Updates | |
1673 | ||
1674 | When a router sends or receives a query with a clear Suppress | |
1675 | Router-Side Processing flag, it must update its timers to reflect | |
1676 | the correct timeout values for the group or sources being queried. | |
1677 | ||
1678 | General queries don't trigger timer update. | |
1679 | */ | |
1680 | if (!s_flag) { | |
1681 | /* general query? */ | |
1682 | if (PIM_INADDR_IS_ANY(group_addr)) { | |
1683 | char dst_str[INET_ADDRSTRLEN]; | |
1684 | char group_str[INET_ADDRSTRLEN]; | |
1685 | pim_inet4_dump("<dst?>", dst_addr, dst_str, | |
1686 | sizeof(dst_str)); | |
1687 | pim_inet4_dump("<group?>", group_addr, group_str, | |
1688 | sizeof(group_str)); | |
1689 | zlog_warn( | |
1690 | "%s: to %s on %s: group=%s sources=%d: s_flag is clear for general query!", | |
15569c58 | 1691 | __func__, dst_str, ifname, group_str, |
d62a17ae | 1692 | num_sources); |
1693 | } | |
1694 | } | |
b05b72e8 DW |
1695 | } |
1696 | ||
d62a17ae | 1697 | void igmp_v3_recv_query(struct igmp_sock *igmp, const char *from_str, |
1698 | char *igmp_msg) | |
b05b72e8 | 1699 | { |
d62a17ae | 1700 | struct interface *ifp; |
1701 | struct pim_interface *pim_ifp; | |
1702 | struct in_addr group_addr; | |
1703 | uint8_t resv_s_qrv = 0; | |
1704 | uint8_t s_flag = 0; | |
1705 | uint8_t qrv = 0; | |
1706 | int i; | |
1707 | ||
1708 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); | |
1709 | ifp = igmp->interface; | |
1710 | pim_ifp = ifp->info; | |
1711 | ||
1712 | /* | |
1713 | * RFC 3376: 4.1.6. QRV (Querier's Robustness Variable) | |
1714 | * | |
1715 | * Routers adopt the QRV value from the most recently received Query | |
1716 | * as their own [Robustness Variable] value, unless that most | |
1717 | * recently received QRV was zero, in which case the receivers use | |
1718 | * the default [Robustness Variable] value specified in section 8.1 | |
1719 | * or a statically configured value. | |
1720 | */ | |
1721 | resv_s_qrv = igmp_msg[8]; | |
1722 | qrv = 7 & resv_s_qrv; | |
1723 | igmp->querier_robustness_variable = | |
1724 | qrv ? qrv : pim_ifp->igmp_default_robustness_variable; | |
1725 | ||
1726 | /* | |
1727 | * RFC 3376: 4.1.7. QQIC (Querier's Query Interval Code) | |
1728 | * | |
1729 | * Multicast routers that are not the current querier adopt the QQI | |
1730 | * value from the most recently received Query as their own [Query | |
1731 | * Interval] value, unless that most recently received QQI was zero, | |
1732 | * in which case the receiving routers use the default. | |
1733 | */ | |
1734 | if (igmp->t_other_querier_timer) { | |
1735 | /* other querier present */ | |
1736 | uint8_t qqic; | |
1737 | uint16_t qqi; | |
1738 | qqic = igmp_msg[9]; | |
1739 | qqi = igmp_msg_decode8to16(qqic); | |
1740 | igmp->querier_query_interval = | |
1741 | qqi ? qqi : pim_ifp->igmp_default_query_interval; | |
1742 | ||
1743 | if (PIM_DEBUG_IGMP_TRACE) { | |
1744 | char ifaddr_str[INET_ADDRSTRLEN]; | |
1745 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
1746 | sizeof(ifaddr_str)); | |
1747 | zlog_debug( | |
1748 | "Querier %s new query interval is %s QQI=%u sec (recv QQIC=%02x from %s)", | |
1749 | ifaddr_str, | |
1750 | qqi ? "recv-non-default" : "default", | |
1751 | igmp->querier_query_interval, qqic, from_str); | |
1752 | } | |
1753 | } | |
1754 | ||
1755 | /* | |
1756 | * RFC 3376: 6.6.1. Timer Updates | |
1757 | * | |
1758 | * When a router sends or receives a query with a clear Suppress | |
1759 | * Router-Side Processing flag, it must update its timers to reflect | |
1760 | * the correct timeout values for the group or sources being queried. | |
1761 | * | |
1762 | * General queries don't trigger timer update. | |
1763 | */ | |
1764 | s_flag = (1 << 3) & resv_s_qrv; | |
1765 | ||
1766 | if (!s_flag) { | |
1767 | /* s_flag is clear */ | |
1768 | ||
1769 | if (PIM_INADDR_IS_ANY(group_addr)) { | |
1770 | /* this is a general query */ | |
1771 | /* log that general query should have the s_flag set */ | |
1772 | zlog_warn( | |
1773 | "General IGMP query v3 from %s on %s: Suppress Router-Side Processing flag is clear", | |
1774 | from_str, ifp->name); | |
1775 | } else { | |
1776 | struct igmp_group *group; | |
1777 | ||
1778 | /* this is a non-general query: perform timer updates */ | |
1779 | ||
1780 | group = find_group_by_addr(igmp, group_addr); | |
1781 | if (group) { | |
1782 | int recv_num_sources = ntohs(*( | |
1783 | uint16_t | |
1784 | *)(igmp_msg | |
1785 | + IGMP_V3_NUMSOURCES_OFFSET)); | |
1786 | ||
1787 | /* | |
1788 | * RFC 3376: 6.6.1. Timer Updates | |
1789 | * Query Q(G,A): Source Timer for sources in A | |
1790 | * are lowered to LMQT | |
1791 | * Query Q(G): Group Timer is lowered to LMQT | |
1792 | */ | |
1793 | if (recv_num_sources < 1) { | |
1794 | /* Query Q(G): Group Timer is lowered to | |
1795 | * LMQT */ | |
1796 | ||
1797 | igmp_group_timer_lower_to_lmqt(group); | |
1798 | } else { | |
1799 | /* Query Q(G,A): Source Timer for | |
1800 | * sources in A are lowered to LMQT */ | |
1801 | ||
1802 | /* Scan sources in query and lower their | |
1803 | * timers to LMQT */ | |
1804 | struct in_addr *sources = | |
1805 | (struct in_addr | |
1806 | *)(igmp_msg | |
1807 | + IGMP_V3_SOURCES_OFFSET); | |
1808 | for (i = 0; i < recv_num_sources; ++i) { | |
1809 | struct in_addr src_addr; | |
1810 | struct igmp_source *src; | |
1811 | memcpy(&src_addr, sources + i, | |
1812 | sizeof(struct in_addr)); | |
1813 | src = igmp_find_source_by_addr( | |
1814 | group, src_addr); | |
1815 | if (src) { | |
1816 | igmp_source_timer_lower_to_lmqt( | |
1817 | src); | |
1818 | } | |
1819 | } | |
1820 | } | |
1821 | } else { | |
1822 | char group_str[INET_ADDRSTRLEN]; | |
1823 | pim_inet4_dump("<group?>", group_addr, | |
1824 | group_str, sizeof(group_str)); | |
1825 | zlog_warn( | |
1826 | "IGMP query v3 from %s on %s: could not find group %s for timer update", | |
1827 | from_str, ifp->name, group_str); | |
1828 | } | |
1829 | } | |
1830 | } /* s_flag is clear: timer updates */ | |
b05b72e8 DW |
1831 | } |
1832 | ||
d62a17ae | 1833 | int igmp_v3_recv_report(struct igmp_sock *igmp, struct in_addr from, |
1834 | const char *from_str, char *igmp_msg, int igmp_msg_len) | |
b05b72e8 | 1835 | { |
d62a17ae | 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; | |
b0f525a8 QY |
1842 | struct pim_interface *pim_ifp; |
1843 | ||
f83f3966 MS |
1844 | if (igmp->mtrace_only) |
1845 | return 0; | |
1846 | ||
b0f525a8 | 1847 | pim_ifp = igmp->interface->info; |
d62a17ae | 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 | ||
9041c30a | 1857 | if (igmp_validate_checksum(igmp_msg, igmp_msg_len) == -1) { |
d62a17ae | 1858 | zlog_warn( |
9041c30a MR |
1859 | "Recv IGMPv3 report from %s on %s with invalid checksum", |
1860 | from_str, ifp->name); | |
d62a17ae | 1861 | return -1; |
1862 | } | |
1863 | ||
21313cbf MS |
1864 | /* Collecting IGMP Rx stats */ |
1865 | igmp->rx_stats.report_v3++; | |
1866 | ||
d62a17ae | 1867 | num_groups = ntohs( |
1868 | *(uint16_t *)(igmp_msg + IGMP_V3_REPORT_NUMGROUPS_OFFSET)); | |
1869 | if (num_groups < 1) { | |
1870 | zlog_warn( | |
1871 | "Recv IGMP report v3 from %s on %s: missing group records", | |
1872 | from_str, ifp->name); | |
1873 | return -1; | |
1874 | } | |
1875 | ||
1876 | if (PIM_DEBUG_IGMP_PACKETS) { | |
1877 | zlog_debug( | |
9041c30a MR |
1878 | "Recv IGMP report v3 from %s on %s: size=%d groups=%d", |
1879 | from_str, ifp->name, igmp_msg_len, num_groups); | |
d62a17ae | 1880 | } |
1881 | ||
1882 | group_record = (uint8_t *)igmp_msg + IGMP_V3_REPORT_GROUPPRECORD_OFFSET; | |
1883 | ||
1884 | /* Scan groups */ | |
1885 | for (i = 0; i < num_groups; ++i) { | |
1886 | struct in_addr rec_group; | |
1887 | uint8_t *sources; | |
1888 | uint8_t *src; | |
1889 | int rec_type; | |
1890 | int rec_auxdatalen; | |
1891 | int rec_num_sources; | |
1892 | int j; | |
1893 | struct prefix lncb; | |
1894 | struct prefix g; | |
b0f525a8 | 1895 | bool filtered = false; |
d62a17ae | 1896 | |
1897 | if ((group_record + IGMP_V3_GROUP_RECORD_MIN_SIZE) | |
1898 | > report_pastend) { | |
1899 | zlog_warn( | |
1900 | "Recv IGMP report v3 from %s on %s: group record beyond report end", | |
1901 | from_str, ifp->name); | |
1902 | return -1; | |
1903 | } | |
1904 | ||
1905 | rec_type = group_record[IGMP_V3_GROUP_RECORD_TYPE_OFFSET]; | |
1906 | rec_auxdatalen = | |
1907 | group_record[IGMP_V3_GROUP_RECORD_AUXDATALEN_OFFSET]; | |
1908 | rec_num_sources = ntohs(*( | |
1909 | uint16_t *)(group_record | |
1910 | + IGMP_V3_GROUP_RECORD_NUMSOURCES_OFFSET)); | |
1911 | ||
1912 | memcpy(&rec_group, | |
1913 | group_record + IGMP_V3_GROUP_RECORD_GROUP_OFFSET, | |
1914 | sizeof(struct in_addr)); | |
1915 | ||
1916 | if (PIM_DEBUG_IGMP_PACKETS) { | |
1917 | zlog_debug( | |
ee2bbf7c | 1918 | " Recv IGMP report v3 from %s on %s: record=%d type=%d auxdatalen=%d sources=%d group=%pI4", |
d62a17ae | 1919 | from_str, ifp->name, i, rec_type, |
1920 | rec_auxdatalen, rec_num_sources, | |
ee2bbf7c | 1921 | &rec_group); |
d62a17ae | 1922 | } |
1923 | ||
1924 | /* Scan sources */ | |
1925 | ||
1926 | sources = group_record + IGMP_V3_GROUP_RECORD_SOURCE_OFFSET; | |
1927 | ||
1928 | for (j = 0, src = sources; j < rec_num_sources; ++j, src += 4) { | |
1929 | ||
1930 | if ((src + 4) > report_pastend) { | |
1931 | zlog_warn( | |
1932 | "Recv IGMP report v3 from %s on %s: group source beyond report end", | |
1933 | from_str, ifp->name); | |
1934 | return -1; | |
1935 | } | |
1936 | ||
1937 | if (PIM_DEBUG_IGMP_PACKETS) { | |
1938 | char src_str[200]; | |
1939 | ||
1940 | if (!inet_ntop(AF_INET, src, src_str, | |
1941 | sizeof(src_str))) | |
772270f3 QY |
1942 | snprintf(src_str, sizeof(src_str), |
1943 | "<source?>"); | |
d62a17ae | 1944 | |
1945 | zlog_debug( | |
ee2bbf7c | 1946 | " Recv IGMP report v3 from %s on %s: record=%d group=%pI4 source=%s", |
d62a17ae | 1947 | from_str, ifp->name, i, |
ee2bbf7c | 1948 | &rec_group, src_str); |
d62a17ae | 1949 | } |
1950 | } /* for (sources) */ | |
1951 | ||
1952 | ||
1953 | lncb.family = AF_INET; | |
1954 | lncb.u.prefix4.s_addr = 0x000000E0; | |
1955 | lncb.prefixlen = 24; | |
1956 | ||
1957 | g.family = AF_INET; | |
1958 | g.u.prefix4 = rec_group; | |
12256b84 | 1959 | g.prefixlen = IPV4_MAX_BITLEN; |
b0f525a8 QY |
1960 | |
1961 | /* determine filtering status for group */ | |
1962 | filtered = pim_is_group_filtered(ifp->info, &rec_group); | |
1963 | ||
1964 | if (PIM_DEBUG_IGMP_PACKETS && filtered) | |
1965 | zlog_debug( | |
ee2bbf7c MS |
1966 | "Filtering IGMPv3 group record %pI4 from %s on %s per prefix-list %s", |
1967 | &rec_group, from_str, ifp->name, | |
b0f525a8 QY |
1968 | pim_ifp->boundary_oil_plist); |
1969 | ||
d62a17ae | 1970 | /* |
1971 | * If we receive a igmp report with the group in 224.0.0.0/24 | |
1972 | * then we should ignore it | |
1973 | */ | |
1974 | if (prefix_match(&lncb, &g)) | |
1975 | local_ncb = 1; | |
1976 | ||
b0f525a8 | 1977 | if (!local_ncb && !filtered) |
d62a17ae | 1978 | switch (rec_type) { |
1979 | case IGMP_GRP_REC_TYPE_MODE_IS_INCLUDE: | |
1980 | igmpv3_report_isin(igmp, from, rec_group, | |
1981 | rec_num_sources, | |
1982 | (struct in_addr *)sources); | |
1983 | break; | |
1984 | case IGMP_GRP_REC_TYPE_MODE_IS_EXCLUDE: | |
1985 | igmpv3_report_isex( | |
1986 | igmp, from, rec_group, rec_num_sources, | |
1987 | (struct in_addr *)sources, 0); | |
1988 | break; | |
1989 | case IGMP_GRP_REC_TYPE_CHANGE_TO_INCLUDE_MODE: | |
1990 | igmpv3_report_toin(igmp, from, rec_group, | |
1991 | rec_num_sources, | |
1992 | (struct in_addr *)sources); | |
1993 | break; | |
1994 | case IGMP_GRP_REC_TYPE_CHANGE_TO_EXCLUDE_MODE: | |
1995 | igmpv3_report_toex(igmp, from, rec_group, | |
1996 | rec_num_sources, | |
1997 | (struct in_addr *)sources); | |
1998 | break; | |
1999 | case IGMP_GRP_REC_TYPE_ALLOW_NEW_SOURCES: | |
2000 | igmpv3_report_allow(igmp, from, rec_group, | |
2001 | rec_num_sources, | |
2002 | (struct in_addr *)sources); | |
2003 | break; | |
2004 | case IGMP_GRP_REC_TYPE_BLOCK_OLD_SOURCES: | |
2005 | igmpv3_report_block(igmp, from, rec_group, | |
2006 | rec_num_sources, | |
2007 | (struct in_addr *)sources); | |
2008 | break; | |
2009 | default: | |
2010 | zlog_warn( | |
2011 | "Recv IGMP report v3 from %s on %s: unknown record type: type=%d", | |
2012 | from_str, ifp->name, rec_type); | |
2013 | } | |
2014 | ||
2015 | group_record += | |
2016 | 8 + (rec_num_sources << 2) + (rec_auxdatalen << 2); | |
2017 | local_ncb = 0; | |
2018 | ||
2019 | } /* for (group records) */ | |
2020 | ||
2021 | return 0; | |
12e41d03 | 2022 | } |