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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 | ||
22 | #include "memory.h" | |
74fb6c66 | 23 | #include "prefix.h" |
9df99407 | 24 | #include "if.h" |
6345a326 DS |
25 | #include "hash.h" |
26 | #include "jhash.h" | |
3613d898 | 27 | #include "lib_errors.h" |
12e41d03 DL |
28 | |
29 | #include "pimd.h" | |
30 | #include "pim_igmp.h" | |
b05b72e8 | 31 | #include "pim_igmpv2.h" |
12e41d03 | 32 | #include "pim_igmpv3.h" |
4d9ad5dc | 33 | #include "pim_igmp_mtrace.h" |
12e41d03 DL |
34 | #include "pim_iface.h" |
35 | #include "pim_sock.h" | |
36 | #include "pim_mroute.h" | |
37 | #include "pim_str.h" | |
38 | #include "pim_util.h" | |
39 | #include "pim_time.h" | |
cd6d2858 DL |
40 | #include "pim_ssm.h" |
41 | #include "pim_tib.h" | |
12e41d03 | 42 | |
a16db099 | 43 | static void group_timer_off(struct gm_group *group); |
cc9f21da | 44 | static void pim_igmp_general_query(struct thread *t); |
12e41d03 | 45 | |
cd6d2858 DL |
46 | void igmp_anysource_forward_start(struct pim_instance *pim, |
47 | struct gm_group *group) | |
48 | { | |
49 | struct gm_source *source; | |
50 | struct in_addr src_addr = {.s_addr = 0}; | |
51 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
52 | assert(group->group_filtermode_isexcl); | |
53 | assert(listcount(group->group_source_list) < 1); | |
54 | ||
55 | source = igmp_get_source_by_addr(group, src_addr, NULL); | |
56 | if (!source) { | |
57 | zlog_warn("%s: Failure to create * source", __func__); | |
58 | return; | |
59 | } | |
60 | ||
61 | igmp_source_forward_start(pim, source); | |
62 | } | |
63 | ||
64 | void igmp_anysource_forward_stop(struct gm_group *group) | |
65 | { | |
66 | struct gm_source *source; | |
67 | struct in_addr star = {.s_addr = 0}; | |
68 | ||
69 | source = igmp_find_source_by_addr(group, star); | |
70 | if (source) | |
71 | igmp_source_forward_stop(source); | |
72 | } | |
73 | ||
74 | static void igmp_source_forward_reevaluate_one(struct pim_instance *pim, | |
261b019f MR |
75 | struct gm_source *source, |
76 | int is_grp_ssm) | |
cd6d2858 DL |
77 | { |
78 | pim_sgaddr sg; | |
79 | struct gm_group *group = source->source_group; | |
cd6d2858 DL |
80 | |
81 | memset(&sg, 0, sizeof(sg)); | |
82 | sg.src = source->source_addr; | |
83 | sg.grp = group->group_addr; | |
84 | ||
261b019f MR |
85 | /** if there is no PIM state **/ |
86 | if (IGMP_SOURCE_TEST_FORWARDING(source->source_flags)) { | |
87 | if (pim_addr_is_any(source->source_addr)) { | |
88 | if (is_grp_ssm) { | |
89 | if (PIM_DEBUG_PIM_EVENTS) | |
90 | zlog_debug( | |
91 | "local membership del for %pSG as G is now SSM", | |
92 | &sg); | |
93 | igmp_source_forward_stop(source); | |
94 | } | |
95 | } else { | |
96 | if (!is_grp_ssm) { | |
97 | if (PIM_DEBUG_PIM_EVENTS) | |
98 | zlog_debug( | |
99 | "local membership del for %pSG as G is now ASM", | |
100 | &sg); | |
101 | igmp_source_forward_stop(source); | |
102 | } | |
cd6d2858 DL |
103 | } |
104 | } else { | |
261b019f | 105 | if (!pim_addr_is_any(source->source_addr) && (is_grp_ssm)) { |
cd6d2858 DL |
106 | if (PIM_DEBUG_PIM_EVENTS) |
107 | zlog_debug( | |
261b019f | 108 | "local membership add for %pSG as G is now SSM", |
cd6d2858 | 109 | &sg); |
261b019f | 110 | igmp_source_forward_start(pim, source); |
cd6d2858 DL |
111 | } |
112 | } | |
113 | } | |
114 | ||
115 | void igmp_source_forward_reevaluate_all(struct pim_instance *pim) | |
116 | { | |
117 | struct interface *ifp; | |
118 | ||
119 | FOR_ALL_INTERFACES (pim->vrf, ifp) { | |
120 | struct pim_interface *pim_ifp = ifp->info; | |
5c13cb9d | 121 | struct listnode *grpnode, *grp_nextnode; |
cd6d2858 DL |
122 | struct gm_group *grp; |
123 | struct pim_ifchannel *ch, *ch_temp; | |
124 | ||
125 | if (!pim_ifp) | |
126 | continue; | |
127 | ||
128 | /* scan igmp groups */ | |
5c13cb9d DA |
129 | for (ALL_LIST_ELEMENTS(pim_ifp->gm_group_list, grpnode, |
130 | grp_nextnode, grp)) { | |
cd6d2858 DL |
131 | struct listnode *srcnode; |
132 | struct gm_source *src; | |
261b019f | 133 | int is_grp_ssm; |
cd6d2858 | 134 | |
6d0a6ede MR |
135 | /* |
136 | * RFC 4604 | |
137 | * section 2.2.1 | |
138 | * EXCLUDE mode does not apply to SSM addresses, | |
139 | * and an SSM-aware router will ignore | |
140 | * MODE_IS_EXCLUDE and CHANGE_TO_EXCLUDE_MODE | |
141 | * requests in the SSM range. | |
142 | */ | |
261b019f MR |
143 | is_grp_ssm = pim_is_grp_ssm(pim, grp->group_addr); |
144 | if (is_grp_ssm && grp->group_filtermode_isexcl) { | |
6d0a6ede MR |
145 | igmp_group_delete(grp); |
146 | } else { | |
147 | /* scan group sources */ | |
148 | for (ALL_LIST_ELEMENTS_RO( | |
149 | grp->group_source_list, srcnode, | |
150 | src)) { | |
261b019f MR |
151 | igmp_source_forward_reevaluate_one( |
152 | pim, src, is_grp_ssm); | |
6d0a6ede MR |
153 | } /* scan group sources */ |
154 | } | |
155 | } /* scan igmp groups */ | |
cd6d2858 DL |
156 | |
157 | RB_FOREACH_SAFE (ch, pim_ifchannel_rb, &pim_ifp->ifchannel_rb, | |
158 | ch_temp) { | |
159 | if (pim_is_grp_ssm(pim, ch->sg.grp)) { | |
160 | if (pim_addr_is_any(ch->sg.src)) | |
161 | pim_ifchannel_delete(ch); | |
162 | } | |
163 | } | |
164 | } /* scan interfaces */ | |
165 | } | |
166 | ||
167 | void igmp_source_forward_start(struct pim_instance *pim, | |
168 | struct gm_source *source) | |
169 | { | |
170 | struct gm_group *group; | |
171 | pim_sgaddr sg; | |
172 | ||
173 | memset(&sg, 0, sizeof(sg)); | |
174 | sg.src = source->source_addr; | |
175 | sg.grp = source->source_group->group_addr; | |
176 | ||
177 | if (PIM_DEBUG_IGMP_TRACE) { | |
178 | zlog_debug("%s: (S,G)=%pSG oif=%s fwd=%d", __func__, &sg, | |
179 | source->source_group->interface->name, | |
180 | IGMP_SOURCE_TEST_FORWARDING(source->source_flags)); | |
181 | } | |
182 | ||
037a2c2e MR |
183 | /* |
184 | * PIM state should not be allowed for ASM group with valid source | |
185 | * address. | |
186 | */ | |
187 | if ((!pim_is_grp_ssm(pim, source->source_group->group_addr)) && | |
188 | !pim_addr_is_any(source->source_addr)) { | |
189 | zlog_warn( | |
190 | "%s: (S,G)=%pSG ASM range having source address, not allowed to create PIM state", | |
191 | __func__, &sg); | |
192 | return; | |
193 | } | |
194 | ||
cd6d2858 DL |
195 | /* Prevent IGMP interface from installing multicast route multiple |
196 | times */ | |
197 | if (IGMP_SOURCE_TEST_FORWARDING(source->source_flags)) { | |
198 | return; | |
199 | } | |
200 | ||
201 | group = source->source_group; | |
202 | ||
203 | if (tib_sg_gm_join(pim, sg, group->interface, | |
204 | &source->source_channel_oil)) | |
205 | IGMP_SOURCE_DO_FORWARDING(source->source_flags); | |
206 | } | |
207 | ||
208 | /* | |
07b12758 DS |
209 | igmp_source_forward_stop: stop forwarding, but keep the source |
210 | igmp_source_delete: stop forwarding, and delete the source | |
cd6d2858 DL |
211 | */ |
212 | void igmp_source_forward_stop(struct gm_source *source) | |
213 | { | |
214 | struct pim_interface *pim_oif; | |
215 | struct gm_group *group; | |
216 | pim_sgaddr sg; | |
217 | ||
218 | memset(&sg, 0, sizeof(sg)); | |
219 | sg.src = source->source_addr; | |
220 | sg.grp = source->source_group->group_addr; | |
221 | ||
222 | if (PIM_DEBUG_IGMP_TRACE) { | |
223 | zlog_debug("%s: (S,G)=%pSG oif=%s fwd=%d", __func__, &sg, | |
224 | source->source_group->interface->name, | |
225 | IGMP_SOURCE_TEST_FORWARDING(source->source_flags)); | |
226 | } | |
227 | ||
228 | /* Prevent IGMP interface from removing multicast route multiple | |
229 | times */ | |
230 | if (!IGMP_SOURCE_TEST_FORWARDING(source->source_flags)) { | |
231 | return; | |
232 | } | |
233 | ||
234 | group = source->source_group; | |
235 | pim_oif = group->interface->info; | |
236 | ||
237 | tib_sg_gm_prune(pim_oif->pim, sg, group->interface, | |
238 | &source->source_channel_oil); | |
239 | IGMP_SOURCE_DONT_FORWARDING(source->source_flags); | |
240 | } | |
241 | ||
b05b72e8 DW |
242 | /* This socket is used for TXing IGMP packets only, IGMP RX happens |
243 | * in pim_mroute_msg() | |
244 | */ | |
d62a17ae | 245 | static int igmp_sock_open(struct in_addr ifaddr, struct interface *ifp, |
246 | uint32_t pim_options) | |
12e41d03 | 247 | { |
d62a17ae | 248 | int fd; |
249 | int join = 0; | |
250 | struct in_addr group; | |
f2058cb4 | 251 | struct pim_interface *pim_ifp = ifp->info; |
d62a17ae | 252 | |
253 | fd = pim_socket_mcast(IPPROTO_IGMP, ifaddr, ifp, 1); | |
254 | ||
255 | if (fd < 0) | |
256 | return -1; | |
257 | ||
b6fcc0b7 DL |
258 | if (inet_aton(PIM_ALL_ROUTERS, &group)) { |
259 | if (!pim_socket_join(fd, group, ifaddr, ifp->ifindex, pim_ifp)) | |
260 | ++join; | |
261 | } else { | |
262 | zlog_warn( | |
263 | "%s %s: IGMP socket fd=%d interface %pI4: could not solve %s to group address: errno=%d: %s", | |
264 | __FILE__, __func__, fd, &ifaddr, PIM_ALL_ROUTERS, errno, | |
265 | safe_strerror(errno)); | |
d62a17ae | 266 | } |
267 | ||
268 | /* | |
269 | IGMP routers periodically send IGMP general queries to | |
270 | AllSystems=224.0.0.1 | |
271 | IGMP routers must receive general queries for querier election. | |
272 | */ | |
273 | if (inet_aton(PIM_ALL_SYSTEMS, &group)) { | |
f2058cb4 | 274 | if (!pim_socket_join(fd, group, ifaddr, ifp->ifindex, pim_ifp)) |
d62a17ae | 275 | ++join; |
276 | } else { | |
277 | zlog_warn( | |
ee2bbf7c MS |
278 | "%s %s: IGMP socket fd=%d interface %pI4: could not solve %s to group address: errno=%d: %s", |
279 | __FILE__, __func__, fd, &ifaddr, | |
d62a17ae | 280 | PIM_ALL_SYSTEMS, errno, safe_strerror(errno)); |
281 | } | |
282 | ||
283 | if (inet_aton(PIM_ALL_IGMP_ROUTERS, &group)) { | |
f2058cb4 DA |
284 | if (!pim_socket_join(fd, group, ifaddr, ifp->ifindex, |
285 | pim_ifp)) { | |
d62a17ae | 286 | ++join; |
287 | } | |
288 | } else { | |
289 | zlog_warn( | |
ee2bbf7c MS |
290 | "%s %s: IGMP socket fd=%d interface %pI4: could not solve %s to group address: errno=%d: %s", |
291 | __FILE__, __func__, fd, &ifaddr, | |
d62a17ae | 292 | PIM_ALL_IGMP_ROUTERS, errno, safe_strerror(errno)); |
293 | } | |
294 | ||
295 | if (!join) { | |
09c866e3 | 296 | flog_err_sys( |
450971aa | 297 | EC_LIB_SOCKET, |
ee2bbf7c MS |
298 | "IGMP socket fd=%d could not join any group on interface address %pI4", |
299 | fd, &ifaddr); | |
d62a17ae | 300 | close(fd); |
301 | fd = -1; | |
302 | } | |
303 | ||
304 | return fd; | |
12e41d03 DL |
305 | } |
306 | ||
307 | #undef IGMP_SOCK_DUMP | |
308 | ||
309 | #ifdef IGMP_SOCK_DUMP | |
310 | static void igmp_sock_dump(array_t *igmp_sock_array) | |
311 | { | |
d62a17ae | 312 | int size = array_size(igmp_sock_array); |
313 | for (int i = 0; i < size; ++i) { | |
314 | ||
c5f76fad | 315 | struct gm_sock *igmp = array_get(igmp_sock_array, i); |
d62a17ae | 316 | |
ee2bbf7c MS |
317 | zlog_debug("%s %s: [%d/%d] igmp_addr=%pI4 fd=%d", __FILE__, |
318 | __func__, i, size, &igmp->ifaddr, | |
15569c58 | 319 | igmp->fd); |
d62a17ae | 320 | } |
12e41d03 DL |
321 | } |
322 | #endif | |
323 | ||
c5f76fad SG |
324 | struct gm_sock *pim_igmp_sock_lookup_ifaddr(struct list *igmp_sock_list, |
325 | struct in_addr ifaddr) | |
12e41d03 | 326 | { |
d62a17ae | 327 | struct listnode *sock_node; |
c5f76fad | 328 | struct gm_sock *igmp; |
12e41d03 DL |
329 | |
330 | #ifdef IGMP_SOCK_DUMP | |
d62a17ae | 331 | igmp_sock_dump(igmp_sock_list); |
12e41d03 DL |
332 | #endif |
333 | ||
d62a17ae | 334 | for (ALL_LIST_ELEMENTS_RO(igmp_sock_list, sock_node, igmp)) |
335 | if (ifaddr.s_addr == igmp->ifaddr.s_addr) | |
336 | return igmp; | |
12e41d03 | 337 | |
d12f46fa | 338 | return NULL; |
12e41d03 DL |
339 | } |
340 | ||
cc9f21da | 341 | static void pim_igmp_other_querier_expire(struct thread *t) |
12e41d03 | 342 | { |
c5f76fad | 343 | struct gm_sock *igmp; |
d62a17ae | 344 | |
345 | igmp = THREAD_ARG(t); | |
346 | ||
df5dfb77 | 347 | assert(!igmp->t_igmp_query_timer); |
d62a17ae | 348 | |
349 | if (PIM_DEBUG_IGMP_TRACE) { | |
350 | char ifaddr_str[INET_ADDRSTRLEN]; | |
351 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
352 | sizeof(ifaddr_str)); | |
15569c58 | 353 | zlog_debug("%s: Querier %s resuming", __func__, ifaddr_str); |
d62a17ae | 354 | } |
9a7cee26 | 355 | /* Mark the interface address as querier address */ |
356 | igmp->querier_addr = igmp->ifaddr; | |
d62a17ae | 357 | |
358 | /* | |
359 | We are the current querier, then | |
360 | re-start sending general queries. | |
361 | RFC 2236 - sec 7 Other Querier | |
362 | present timer expired (Send General | |
363 | Query, Set Gen. Query. timer) | |
364 | */ | |
365 | pim_igmp_general_query(t); | |
12e41d03 DL |
366 | } |
367 | ||
c5f76fad | 368 | void pim_igmp_other_querier_timer_on(struct gm_sock *igmp) |
12e41d03 | 369 | { |
d62a17ae | 370 | long other_querier_present_interval_msec; |
371 | struct pim_interface *pim_ifp; | |
372 | ||
df5dfb77 DL |
373 | assert(igmp); |
374 | assert(igmp->interface); | |
375 | assert(igmp->interface->info); | |
d62a17ae | 376 | |
377 | pim_ifp = igmp->interface->info; | |
378 | ||
379 | if (igmp->t_other_querier_timer) { | |
380 | /* | |
381 | There is other querier present already, | |
382 | then reset the other-querier-present timer. | |
383 | */ | |
384 | ||
385 | if (PIM_DEBUG_IGMP_TRACE) { | |
386 | char ifaddr_str[INET_ADDRSTRLEN]; | |
387 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
388 | sizeof(ifaddr_str)); | |
389 | zlog_debug( | |
390 | "Querier %s resetting TIMER event for Other-Querier-Present", | |
391 | ifaddr_str); | |
392 | } | |
393 | THREAD_OFF(igmp->t_other_querier_timer); | |
394 | } else { | |
395 | /* | |
396 | We are the current querier, then stop sending general queries: | |
397 | igmp->t_igmp_query_timer = NULL; | |
398 | */ | |
399 | pim_igmp_general_query_off(igmp); | |
400 | } | |
401 | ||
402 | /* | |
403 | Since this socket is starting the other-querier-present timer, | |
404 | there should not be periodic query timer for this socket. | |
405 | */ | |
df5dfb77 | 406 | assert(!igmp->t_igmp_query_timer); |
d62a17ae | 407 | |
408 | /* | |
409 | RFC 3376: 8.5. Other Querier Present Interval | |
410 | ||
411 | The Other Querier Present Interval is the length of time that must | |
412 | pass before a multicast router decides that there is no longer | |
413 | another multicast router which should be the querier. This value | |
414 | MUST be ((the Robustness Variable) times (the Query Interval)) plus | |
415 | (one half of one Query Response Interval). | |
416 | ||
417 | other_querier_present_interval_msec = \ | |
418 | igmp->querier_robustness_variable * \ | |
419 | 1000 * igmp->querier_query_interval + \ | |
420 | 100 * (pim_ifp->query_max_response_time_dsec >> 1); | |
421 | */ | |
422 | other_querier_present_interval_msec = PIM_IGMP_OQPI_MSEC( | |
423 | igmp->querier_robustness_variable, igmp->querier_query_interval, | |
18adcff1 | 424 | pim_ifp->gm_query_max_response_time_dsec); |
d62a17ae | 425 | |
426 | if (PIM_DEBUG_IGMP_TRACE) { | |
427 | char ifaddr_str[INET_ADDRSTRLEN]; | |
428 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
429 | sizeof(ifaddr_str)); | |
430 | zlog_debug( | |
431 | "Querier %s scheduling %ld.%03ld sec TIMER event for Other-Querier-Present", | |
432 | ifaddr_str, other_querier_present_interval_msec / 1000, | |
433 | other_querier_present_interval_msec % 1000); | |
434 | } | |
435 | ||
36417fcc DS |
436 | thread_add_timer_msec(router->master, pim_igmp_other_querier_expire, |
437 | igmp, other_querier_present_interval_msec, | |
d62a17ae | 438 | &igmp->t_other_querier_timer); |
12e41d03 DL |
439 | } |
440 | ||
c5f76fad | 441 | void pim_igmp_other_querier_timer_off(struct gm_sock *igmp) |
12e41d03 | 442 | { |
df5dfb77 | 443 | assert(igmp); |
d62a17ae | 444 | |
445 | if (PIM_DEBUG_IGMP_TRACE) { | |
446 | if (igmp->t_other_querier_timer) { | |
447 | char ifaddr_str[INET_ADDRSTRLEN]; | |
448 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
449 | sizeof(ifaddr_str)); | |
450 | zlog_debug( | |
451 | "IGMP querier %s fd=%d cancelling other-querier-present TIMER event on %s", | |
452 | ifaddr_str, igmp->fd, igmp->interface->name); | |
453 | } | |
454 | } | |
455 | THREAD_OFF(igmp->t_other_querier_timer); | |
12e41d03 DL |
456 | } |
457 | ||
9041c30a MR |
458 | int igmp_validate_checksum(char *igmp_msg, int igmp_msg_len) |
459 | { | |
460 | uint16_t recv_checksum; | |
461 | uint16_t checksum; | |
462 | ||
463 | IGMP_GET_INT16((unsigned char *)(igmp_msg + IGMP_CHECKSUM_OFFSET), | |
464 | recv_checksum); | |
465 | ||
466 | /* Clear the checksum field */ | |
467 | memset(igmp_msg + IGMP_CHECKSUM_OFFSET, 0, 2); | |
468 | ||
469 | checksum = in_cksum(igmp_msg, igmp_msg_len); | |
470 | if (ntohs(checksum) != recv_checksum) { | |
471 | zlog_warn("Invalid checksum received %x, calculated %x", | |
472 | recv_checksum, ntohs(checksum)); | |
473 | return -1; | |
474 | } | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
c5f76fad | 479 | static int igmp_recv_query(struct gm_sock *igmp, int query_version, |
d62a17ae | 480 | int max_resp_code, struct in_addr from, |
481 | const char *from_str, char *igmp_msg, | |
482 | int igmp_msg_len) | |
12e41d03 | 483 | { |
d62a17ae | 484 | struct interface *ifp; |
485 | struct pim_interface *pim_ifp; | |
486 | struct in_addr group_addr; | |
d62a17ae | 487 | |
f83f3966 MS |
488 | if (igmp->mtrace_only) |
489 | return 0; | |
490 | ||
d62a17ae | 491 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
492 | ||
493 | ifp = igmp->interface; | |
494 | pim_ifp = ifp->info; | |
495 | ||
9041c30a | 496 | if (igmp_validate_checksum(igmp_msg, igmp_msg_len) == -1) { |
d62a17ae | 497 | zlog_warn( |
9041c30a MR |
498 | "Recv IGMP query v%d from %s on %s with invalid checksum", |
499 | query_version, from_str, ifp->name); | |
d62a17ae | 500 | return -1; |
501 | } | |
502 | ||
8890b440 DS |
503 | if (!pim_if_connected_to_source(ifp, from)) { |
504 | if (PIM_DEBUG_IGMP_PACKETS) | |
505 | zlog_debug("Recv IGMP query on interface: %s from a non-connected source: %s", | |
506 | ifp->name, from_str); | |
507 | return 0; | |
508 | } | |
509 | ||
096f7609 | 510 | if (if_address_is_local(&from, AF_INET, ifp->vrf->vrf_id)) { |
26a0f1e2 DS |
511 | if (PIM_DEBUG_IGMP_PACKETS) |
512 | zlog_debug("Recv IGMP query on interface: %s from ourself %s", | |
513 | ifp->name, from_str); | |
514 | return 0; | |
515 | } | |
516 | ||
21313cbf MS |
517 | /* Collecting IGMP Rx stats */ |
518 | switch (query_version) { | |
519 | case 1: | |
f2058cb4 | 520 | igmp->igmp_stats.query_v1++; |
21313cbf MS |
521 | break; |
522 | case 2: | |
f2058cb4 | 523 | igmp->igmp_stats.query_v2++; |
21313cbf MS |
524 | break; |
525 | case 3: | |
f2058cb4 | 526 | igmp->igmp_stats.query_v3++; |
21313cbf MS |
527 | break; |
528 | default: | |
f2058cb4 | 529 | igmp->igmp_stats.unsupported++; |
21313cbf MS |
530 | } |
531 | ||
b0f525a8 QY |
532 | /* |
533 | * RFC 3376 defines some guidelines on operating in backwards | |
534 | * compatibility with older versions of IGMP but there are some gaps in | |
535 | * the logic: | |
d62a17ae | 536 | * |
537 | * - once we drop from say version 3 to version 2 we will never go back | |
b0f525a8 QY |
538 | * to version 3 even if the node that TXed an IGMP v2 query upgrades |
539 | * to v3 | |
d62a17ae | 540 | * |
541 | * - The node with the lowest IP is the querier so we will only know to | |
b0f525a8 QY |
542 | * drop from v3 to v2 if the node that is the querier is also the one |
543 | * that is running igmp v2. If a non-querier only supports igmp v2 | |
544 | * we will have no way of knowing. | |
d62a17ae | 545 | * |
546 | * For now we will simplify things and inform the user that they need to | |
547 | * configure all PIM routers to use the same version of IGMP. | |
548 | */ | |
29e58225 | 549 | if (query_version != pim_ifp->igmp_version) { |
d62a17ae | 550 | zlog_warn( |
3efd0893 | 551 | "Recv IGMP query v%d from %s on %s but we are using v%d, please configure all PIM routers on this subnet to use the same IGMP version", |
29e58225 DL |
552 | query_version, from_str, ifp->name, |
553 | pim_ifp->igmp_version); | |
d62a17ae | 554 | return 0; |
555 | } | |
556 | ||
557 | if (PIM_DEBUG_IGMP_PACKETS) { | |
558 | char group_str[INET_ADDRSTRLEN]; | |
559 | pim_inet4_dump("<group?>", group_addr, group_str, | |
560 | sizeof(group_str)); | |
561 | zlog_debug("Recv IGMP query v%d from %s on %s for group %s", | |
562 | query_version, from_str, ifp->name, group_str); | |
563 | } | |
564 | ||
565 | /* | |
566 | RFC 3376: 6.6.2. Querier Election | |
567 | ||
568 | When a router receives a query with a lower IP address, it sets | |
569 | the Other-Querier-Present timer to Other Querier Present Interval | |
570 | and ceases to send queries on the network if it was the previously | |
571 | elected querier. | |
572 | */ | |
573 | if (ntohl(from.s_addr) < ntohl(igmp->ifaddr.s_addr)) { | |
574 | ||
5bc4a46b MR |
575 | /* As per RFC 2236 section 3: |
576 | * When a Querier receives a Leave Group message for a group | |
577 | * that has group members on the reception interface, it sends | |
578 | * [Last Member Query Count] Group-Specific Queries every [Last | |
579 | * Member Query Interval] to the group being left. These | |
580 | * Group-Specific Queries have their Max Response time set to | |
581 | * [Last Member Query Interval]. If no Reports are received | |
582 | * after the response time of the last query expires, the | |
583 | * routers assume that the group has no local members, as above. | |
584 | * Any Querier to non-Querier transition is ignored during this | |
585 | * time; the same router keeps sending the Group-Specific | |
586 | * Queries. | |
587 | */ | |
588 | struct gm_group *group; | |
589 | ||
590 | group = find_group_by_addr(igmp, group_addr); | |
591 | if (group && group->t_group_query_retransmit_timer) { | |
592 | if (PIM_DEBUG_IGMP_TRACE) | |
593 | zlog_debug( | |
594 | "%s: lower address query packet from %s is ignored when last member query interval timer is running", | |
595 | ifp->name, from_str); | |
596 | return 0; | |
597 | } | |
598 | ||
d62a17ae | 599 | if (PIM_DEBUG_IGMP_TRACE) { |
600 | char ifaddr_str[INET_ADDRSTRLEN]; | |
601 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
602 | sizeof(ifaddr_str)); | |
603 | zlog_debug( | |
604 | "%s: local address %s (%u) lost querier election to %s (%u)", | |
605 | ifp->name, ifaddr_str, | |
606 | ntohl(igmp->ifaddr.s_addr), from_str, | |
607 | ntohl(from.s_addr)); | |
608 | } | |
9a7cee26 | 609 | if (ntohl(from.s_addr) < ntohl(igmp->querier_addr.s_addr)) |
610 | igmp->querier_addr.s_addr = from.s_addr; | |
d62a17ae | 611 | |
612 | pim_igmp_other_querier_timer_on(igmp); | |
613 | } | |
614 | ||
615 | /* IGMP version 3 is the only one where we process the RXed query */ | |
616 | if (query_version == 3) { | |
617 | igmp_v3_recv_query(igmp, from_str, igmp_msg); | |
618 | } | |
619 | ||
620 | return 0; | |
12e41d03 DL |
621 | } |
622 | ||
d62a17ae | 623 | static void on_trace(const char *label, struct interface *ifp, |
624 | struct in_addr from) | |
12e41d03 | 625 | { |
d62a17ae | 626 | if (PIM_DEBUG_IGMP_TRACE) { |
627 | char from_str[INET_ADDRSTRLEN]; | |
628 | pim_inet4_dump("<from?>", from, from_str, sizeof(from_str)); | |
629 | zlog_debug("%s: from %s on %s", label, from_str, ifp->name); | |
630 | } | |
12e41d03 DL |
631 | } |
632 | ||
c5f76fad | 633 | static int igmp_v1_recv_report(struct gm_sock *igmp, struct in_addr from, |
d62a17ae | 634 | const char *from_str, char *igmp_msg, |
635 | int igmp_msg_len) | |
12e41d03 | 636 | { |
d62a17ae | 637 | struct interface *ifp = igmp->interface; |
a16db099 | 638 | struct gm_group *group; |
d62a17ae | 639 | struct in_addr group_addr; |
12e41d03 | 640 | |
15569c58 | 641 | on_trace(__func__, igmp->interface, from); |
12e41d03 | 642 | |
f83f3966 MS |
643 | if (igmp->mtrace_only) |
644 | return 0; | |
645 | ||
d62a17ae | 646 | if (igmp_msg_len != IGMP_V12_MSG_SIZE) { |
647 | zlog_warn( | |
648 | "Recv IGMP report v1 from %s on %s: size=%d other than correct=%d", | |
649 | from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE); | |
650 | return -1; | |
651 | } | |
12e41d03 | 652 | |
9041c30a MR |
653 | if (igmp_validate_checksum(igmp_msg, igmp_msg_len) == -1) { |
654 | zlog_warn( | |
655 | "Recv IGMP report v1 from %s on %s with invalid checksum", | |
656 | from_str, ifp->name); | |
657 | return -1; | |
658 | } | |
659 | ||
21313cbf | 660 | /* Collecting IGMP Rx stats */ |
f2058cb4 | 661 | igmp->igmp_stats.report_v1++; |
21313cbf | 662 | |
d62a17ae | 663 | if (PIM_DEBUG_IGMP_TRACE) { |
15569c58 | 664 | zlog_warn("%s %s: FIXME WRITEME", __FILE__, __func__); |
d62a17ae | 665 | } |
12e41d03 | 666 | |
d62a17ae | 667 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
12e41d03 | 668 | |
b0f525a8 QY |
669 | if (pim_is_group_filtered(ifp->info, &group_addr)) |
670 | return -1; | |
671 | ||
d62a17ae | 672 | /* non-existant group is created as INCLUDE {empty} */ |
673 | group = igmp_add_group_by_addr(igmp, group_addr); | |
674 | if (!group) { | |
675 | return -1; | |
676 | } | |
12e41d03 | 677 | |
d62a17ae | 678 | group->last_igmp_v1_report_dsec = pim_time_monotonic_dsec(); |
12e41d03 | 679 | |
d62a17ae | 680 | return 0; |
12e41d03 DL |
681 | } |
682 | ||
88ea79ad | 683 | bool pim_igmp_verify_header(struct ip *ip_hdr, size_t len, size_t *hlen) |
ff4ad870 | 684 | { |
88ea79ad MR |
685 | char *igmp_msg; |
686 | int igmp_msg_len; | |
687 | int msg_type; | |
688 | size_t ip_hlen; /* ip header length in bytes */ | |
689 | ||
ff4ad870 MR |
690 | if (len < sizeof(*ip_hdr)) { |
691 | zlog_warn("IGMP packet size=%zu shorter than minimum=%zu", len, | |
692 | sizeof(*ip_hdr)); | |
693 | return false; | |
694 | } | |
695 | ||
88ea79ad MR |
696 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ |
697 | *hlen = ip_hlen; | |
698 | ||
699 | if (ip_hlen > len) { | |
700 | zlog_warn( | |
701 | "IGMP packet header claims size %zu, but we only have %zu bytes", | |
702 | ip_hlen, len); | |
703 | return false; | |
704 | } | |
705 | ||
706 | igmp_msg = (char *)ip_hdr + ip_hlen; | |
707 | igmp_msg_len = len - ip_hlen; | |
708 | msg_type = *igmp_msg; | |
709 | ||
ff4ad870 MR |
710 | if (igmp_msg_len < PIM_IGMP_MIN_LEN) { |
711 | zlog_warn("IGMP message size=%d shorter than minimum=%d", | |
712 | igmp_msg_len, PIM_IGMP_MIN_LEN); | |
713 | return false; | |
714 | } | |
715 | ||
54d7bf0c MR |
716 | if ((msg_type != PIM_IGMP_MTRACE_RESPONSE) |
717 | && (msg_type != PIM_IGMP_MTRACE_QUERY_REQUEST)) { | |
718 | if (ip_hdr->ip_ttl != 1) { | |
719 | zlog_warn( | |
720 | "Recv IGMP packet with invalid ttl=%u, discarding the packet", | |
721 | ip_hdr->ip_ttl); | |
e748f180 | 722 | return false; |
54d7bf0c MR |
723 | } |
724 | } | |
725 | ||
ff4ad870 MR |
726 | return true; |
727 | } | |
728 | ||
c5f76fad | 729 | int pim_igmp_packet(struct gm_sock *igmp, char *buf, size_t len) |
12e41d03 | 730 | { |
88ea79ad | 731 | struct ip *ip_hdr = (struct ip *)buf; |
d62a17ae | 732 | size_t ip_hlen; /* ip header length in bytes */ |
733 | char *igmp_msg; | |
734 | int igmp_msg_len; | |
735 | int msg_type; | |
736 | char from_str[INET_ADDRSTRLEN]; | |
737 | char to_str[INET_ADDRSTRLEN]; | |
738 | ||
88ea79ad | 739 | if (!pim_igmp_verify_header(ip_hdr, len, &ip_hlen)) |
f08e6750 | 740 | return -1; |
f08e6750 | 741 | |
d62a17ae | 742 | igmp_msg = buf + ip_hlen; |
d62a17ae | 743 | igmp_msg_len = len - ip_hlen; |
f08e6750 QY |
744 | msg_type = *igmp_msg; |
745 | ||
ff4ad870 MR |
746 | pim_inet4_dump("<src?>", ip_hdr->ip_src, from_str, sizeof(from_str)); |
747 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, to_str, sizeof(to_str)); | |
748 | ||
d62a17ae | 749 | if (PIM_DEBUG_IGMP_PACKETS) { |
750 | zlog_debug( | |
c7e663d6 DS |
751 | "Recv IGMP packet from %s to %s on %s: size=%zu ttl=%d msg_type=%d msg_size=%d", |
752 | from_str, to_str, igmp->interface->name, len, ip_hdr->ip_ttl, | |
d62a17ae | 753 | msg_type, igmp_msg_len); |
754 | } | |
12e41d03 | 755 | |
d62a17ae | 756 | switch (msg_type) { |
757 | case PIM_IGMP_MEMBERSHIP_QUERY: { | |
758 | int max_resp_code = igmp_msg[1]; | |
759 | int query_version; | |
760 | ||
761 | /* | |
762 | RFC 3376: 7.1. Query Version Distinctions | |
763 | IGMPv1 Query: length = 8 octets AND Max Resp Code field is | |
764 | zero | |
765 | IGMPv2 Query: length = 8 octets AND Max Resp Code field is | |
766 | non-zero | |
767 | IGMPv3 Query: length >= 12 octets | |
768 | */ | |
769 | ||
770 | if (igmp_msg_len == 8) { | |
771 | query_version = max_resp_code ? 2 : 1; | |
772 | } else if (igmp_msg_len >= 12) { | |
773 | query_version = 3; | |
774 | } else { | |
775 | zlog_warn("Unknown IGMP query version"); | |
776 | return -1; | |
777 | } | |
778 | ||
779 | return igmp_recv_query(igmp, query_version, max_resp_code, | |
780 | ip_hdr->ip_src, from_str, igmp_msg, | |
781 | igmp_msg_len); | |
782 | } | |
12e41d03 | 783 | |
d62a17ae | 784 | case PIM_IGMP_V3_MEMBERSHIP_REPORT: |
785 | return igmp_v3_recv_report(igmp, ip_hdr->ip_src, from_str, | |
786 | igmp_msg, igmp_msg_len); | |
12e41d03 | 787 | |
d62a17ae | 788 | case PIM_IGMP_V2_MEMBERSHIP_REPORT: |
789 | return igmp_v2_recv_report(igmp, ip_hdr->ip_src, from_str, | |
790 | igmp_msg, igmp_msg_len); | |
12e41d03 | 791 | |
d62a17ae | 792 | case PIM_IGMP_V1_MEMBERSHIP_REPORT: |
793 | return igmp_v1_recv_report(igmp, ip_hdr->ip_src, from_str, | |
794 | igmp_msg, igmp_msg_len); | |
12e41d03 | 795 | |
d62a17ae | 796 | case PIM_IGMP_V2_LEAVE_GROUP: |
d1b61cb9 MR |
797 | return igmp_v2_recv_leave(igmp, ip_hdr, from_str, igmp_msg, |
798 | igmp_msg_len); | |
4d9ad5dc MS |
799 | |
800 | case PIM_IGMP_MTRACE_RESPONSE: | |
801 | return igmp_mtrace_recv_response(igmp, ip_hdr, ip_hdr->ip_src, | |
802 | from_str, igmp_msg, | |
803 | igmp_msg_len); | |
4d9ad5dc MS |
804 | case PIM_IGMP_MTRACE_QUERY_REQUEST: |
805 | return igmp_mtrace_recv_qry_req(igmp, ip_hdr, ip_hdr->ip_src, | |
806 | from_str, igmp_msg, | |
807 | igmp_msg_len); | |
d62a17ae | 808 | } |
12e41d03 | 809 | |
d62a17ae | 810 | zlog_warn("Ignoring unsupported IGMP message type: %d", msg_type); |
811 | ||
21313cbf | 812 | /* Collecting IGMP Rx stats */ |
f2058cb4 | 813 | igmp->igmp_stats.unsupported++; |
21313cbf | 814 | |
d62a17ae | 815 | return -1; |
12e41d03 DL |
816 | } |
817 | ||
c5f76fad | 818 | void pim_igmp_general_query_on(struct gm_sock *igmp) |
12e41d03 | 819 | { |
d62a17ae | 820 | struct pim_interface *pim_ifp; |
821 | int startup_mode; | |
822 | int query_interval; | |
823 | ||
824 | /* | |
825 | Since this socket is starting as querier, | |
826 | there should not exist a timer for other-querier-present. | |
827 | */ | |
df5dfb77 | 828 | assert(!igmp->t_other_querier_timer); |
d62a17ae | 829 | pim_ifp = igmp->interface->info; |
df5dfb77 | 830 | assert(pim_ifp); |
d62a17ae | 831 | |
832 | /* | |
833 | RFC 3376: 8.6. Startup Query Interval | |
834 | ||
835 | The Startup Query Interval is the interval between General Queries | |
836 | sent by a Querier on startup. Default: 1/4 the Query Interval. | |
837 | The first one should be sent out immediately instead of 125/4 | |
838 | seconds from now. | |
839 | */ | |
840 | startup_mode = igmp->startup_query_count > 0; | |
841 | if (startup_mode) { | |
842 | /* | |
843 | * If this is the first time we are sending a query on a | |
844 | * newly configured igmp interface send it out in 1 second | |
845 | * just to give the entire world a tiny bit of time to settle | |
846 | * else the query interval is: | |
18adcff1 | 847 | * query_interval = pim_ifp->gm_default_query_interval >> 2; |
d62a17ae | 848 | */ |
18adcff1 SG |
849 | if (igmp->startup_query_count == |
850 | igmp->querier_robustness_variable) | |
d62a17ae | 851 | query_interval = 1; |
852 | else | |
29e58225 | 853 | query_interval = PIM_IGMP_SQI( |
18adcff1 | 854 | pim_ifp->gm_default_query_interval); |
d62a17ae | 855 | |
856 | --igmp->startup_query_count; | |
857 | } else { | |
858 | query_interval = igmp->querier_query_interval; | |
859 | } | |
860 | ||
861 | if (PIM_DEBUG_IGMP_TRACE) { | |
862 | char ifaddr_str[INET_ADDRSTRLEN]; | |
863 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
864 | sizeof(ifaddr_str)); | |
865 | zlog_debug( | |
866 | "Querier %s scheduling %d-second (%s) TIMER event for IGMP query on fd=%d", | |
867 | ifaddr_str, query_interval, | |
868 | startup_mode ? "startup" : "non-startup", igmp->fd); | |
869 | } | |
36417fcc DS |
870 | thread_add_timer(router->master, pim_igmp_general_query, igmp, |
871 | query_interval, &igmp->t_igmp_query_timer); | |
12e41d03 DL |
872 | } |
873 | ||
c5f76fad | 874 | void pim_igmp_general_query_off(struct gm_sock *igmp) |
12e41d03 | 875 | { |
df5dfb77 | 876 | assert(igmp); |
d62a17ae | 877 | |
878 | if (PIM_DEBUG_IGMP_TRACE) { | |
879 | if (igmp->t_igmp_query_timer) { | |
880 | char ifaddr_str[INET_ADDRSTRLEN]; | |
881 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
882 | sizeof(ifaddr_str)); | |
883 | zlog_debug( | |
884 | "IGMP querier %s fd=%d cancelling query TIMER event on %s", | |
885 | ifaddr_str, igmp->fd, igmp->interface->name); | |
886 | } | |
887 | } | |
888 | THREAD_OFF(igmp->t_igmp_query_timer); | |
12e41d03 DL |
889 | } |
890 | ||
891 | /* Issue IGMP general query */ | |
cc9f21da | 892 | static void pim_igmp_general_query(struct thread *t) |
12e41d03 | 893 | { |
c5f76fad | 894 | struct gm_sock *igmp; |
d62a17ae | 895 | struct in_addr dst_addr; |
896 | struct in_addr group_addr; | |
897 | struct pim_interface *pim_ifp; | |
898 | int query_buf_size; | |
899 | ||
900 | igmp = THREAD_ARG(t); | |
901 | ||
df5dfb77 DL |
902 | assert(igmp->interface); |
903 | assert(igmp->interface->info); | |
d62a17ae | 904 | |
905 | pim_ifp = igmp->interface->info; | |
906 | ||
29e58225 | 907 | if (pim_ifp->igmp_version == 3) { |
d62a17ae | 908 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; |
909 | } else { | |
910 | query_buf_size = IGMP_V12_MSG_SIZE; | |
911 | } | |
912 | ||
913 | char query_buf[query_buf_size]; | |
914 | ||
915 | /* | |
916 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
917 | ||
918 | In IGMPv3, General Queries are sent with an IP destination address | |
919 | of 224.0.0.1, the all-systems multicast address. Group-Specific | |
920 | and Group-and-Source-Specific Queries are sent with an IP | |
921 | destination address equal to the multicast address of interest. | |
922 | */ | |
923 | ||
924 | dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); | |
925 | group_addr.s_addr = PIM_NET_INADDR_ANY; | |
926 | ||
927 | if (PIM_DEBUG_IGMP_TRACE) { | |
928 | char querier_str[INET_ADDRSTRLEN]; | |
929 | char dst_str[INET_ADDRSTRLEN]; | |
930 | pim_inet4_dump("<querier?>", igmp->ifaddr, querier_str, | |
931 | sizeof(querier_str)); | |
932 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
933 | zlog_debug("Querier %s issuing IGMP general query to %s on %s", | |
934 | querier_str, dst_str, igmp->interface->name); | |
935 | } | |
936 | ||
278912ea DA |
937 | igmp_send_query(pim_ifp->igmp_version, 0 /* igmp_group */, query_buf, |
938 | sizeof(query_buf), 0 /* num_sources */, dst_addr, | |
939 | group_addr, pim_ifp->gm_query_max_response_time_dsec, | |
940 | 1 /* s_flag: always set for general queries */, igmp); | |
d62a17ae | 941 | |
942 | pim_igmp_general_query_on(igmp); | |
12e41d03 DL |
943 | } |
944 | ||
c5f76fad | 945 | static void sock_close(struct gm_sock *igmp) |
12e41d03 | 946 | { |
d62a17ae | 947 | pim_igmp_other_querier_timer_off(igmp); |
948 | pim_igmp_general_query_off(igmp); | |
949 | ||
950 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { | |
951 | if (igmp->t_igmp_read) { | |
952 | zlog_debug( | |
ee2bbf7c MS |
953 | "Cancelling READ event on IGMP socket %pI4 fd=%d on interface %s", |
954 | &igmp->ifaddr, igmp->fd, | |
d62a17ae | 955 | igmp->interface->name); |
956 | } | |
957 | } | |
958 | THREAD_OFF(igmp->t_igmp_read); | |
959 | ||
960 | if (close(igmp->fd)) { | |
af4c2728 | 961 | flog_err( |
450971aa | 962 | EC_LIB_SOCKET, |
ee2bbf7c MS |
963 | "Failure closing IGMP socket %pI4 fd=%d on interface %s: errno=%d: %s", |
964 | &igmp->ifaddr, igmp->fd, | |
d62a17ae | 965 | igmp->interface->name, errno, safe_strerror(errno)); |
966 | } | |
967 | ||
968 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { | |
ee2bbf7c MS |
969 | zlog_debug("Deleted IGMP socket %pI4 fd=%d on interface %s", |
970 | &igmp->ifaddr, igmp->fd, | |
d62a17ae | 971 | igmp->interface->name); |
972 | } | |
12e41d03 DL |
973 | } |
974 | ||
c5f76fad | 975 | void igmp_startup_mode_on(struct gm_sock *igmp) |
12e41d03 | 976 | { |
d62a17ae | 977 | struct pim_interface *pim_ifp; |
12e41d03 | 978 | |
d62a17ae | 979 | pim_ifp = igmp->interface->info; |
12e41d03 | 980 | |
d62a17ae | 981 | /* |
982 | RFC 3376: 8.7. Startup Query Count | |
12e41d03 | 983 | |
d62a17ae | 984 | The Startup Query Count is the number of Queries sent out on |
985 | startup, separated by the Startup Query Interval. Default: the | |
986 | Robustness Variable. | |
987 | */ | |
988 | igmp->startup_query_count = igmp->querier_robustness_variable; | |
12e41d03 | 989 | |
d62a17ae | 990 | /* |
991 | Since we're (re)starting, reset QQI to default Query Interval | |
992 | */ | |
18adcff1 | 993 | igmp->querier_query_interval = pim_ifp->gm_default_query_interval; |
12e41d03 DL |
994 | } |
995 | ||
a16db099 | 996 | static void igmp_group_free(struct gm_group *group) |
12e41d03 | 997 | { |
6a154c88 | 998 | list_delete(&group->group_source_list); |
12e41d03 | 999 | |
d62a17ae | 1000 | XFREE(MTYPE_PIM_IGMP_GROUP, group); |
12e41d03 DL |
1001 | } |
1002 | ||
dda4d23c | 1003 | static void igmp_group_count_incr(struct pim_interface *pim_ifp) |
339f7695 | 1004 | { |
3e5d8665 DA |
1005 | uint32_t group_count = listcount(pim_ifp->gm_group_list); |
1006 | ||
339f7695 | 1007 | ++pim_ifp->pim->igmp_group_count; |
1008 | if (pim_ifp->pim->igmp_group_count | |
1009 | == pim_ifp->pim->igmp_watermark_limit) { | |
1010 | zlog_warn( | |
1011 | "IGMP group count reached watermark limit: %u(vrf: %s)", | |
1012 | pim_ifp->pim->igmp_group_count, | |
1013 | VRF_LOGNAME(pim_ifp->pim->vrf)); | |
1014 | } | |
3e5d8665 DA |
1015 | |
1016 | if (pim_ifp->igmp_peak_group_count < group_count) | |
1017 | pim_ifp->igmp_peak_group_count = group_count; | |
339f7695 | 1018 | } |
1019 | ||
dda4d23c | 1020 | static void igmp_group_count_decr(struct pim_interface *pim_ifp) |
339f7695 | 1021 | { |
339f7695 | 1022 | if (pim_ifp->pim->igmp_group_count == 0) { |
1023 | zlog_warn("Cannot decrement igmp group count below 0(vrf: %s)", | |
1024 | VRF_LOGNAME(pim_ifp->pim->vrf)); | |
1025 | return; | |
1026 | } | |
1027 | ||
1028 | --pim_ifp->pim->igmp_group_count; | |
1029 | } | |
1030 | ||
a16db099 | 1031 | void igmp_group_delete(struct gm_group *group) |
12e41d03 | 1032 | { |
d62a17ae | 1033 | struct listnode *src_node; |
1034 | struct listnode *src_nextnode; | |
51700107 | 1035 | struct gm_source *src; |
dda4d23c | 1036 | struct pim_interface *pim_ifp = group->interface->info; |
d62a17ae | 1037 | |
1038 | if (PIM_DEBUG_IGMP_TRACE) { | |
1039 | char group_str[INET_ADDRSTRLEN]; | |
1040 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1041 | sizeof(group_str)); | |
dda4d23c DL |
1042 | zlog_debug("Deleting IGMP group %s from interface %s", |
1043 | group_str, group->interface->name); | |
d62a17ae | 1044 | } |
1045 | ||
1046 | for (ALL_LIST_ELEMENTS(group->group_source_list, src_node, src_nextnode, | |
1047 | src)) { | |
1048 | igmp_source_delete(src); | |
1049 | } | |
1050 | ||
28ef0ee1 | 1051 | THREAD_OFF(group->t_group_query_retransmit_timer); |
d62a17ae | 1052 | |
1053 | group_timer_off(group); | |
dda4d23c | 1054 | igmp_group_count_decr(pim_ifp); |
18adcff1 SG |
1055 | listnode_delete(pim_ifp->gm_group_list, group); |
1056 | hash_release(pim_ifp->gm_group_hash, group); | |
d62a17ae | 1057 | |
1058 | igmp_group_free(group); | |
12e41d03 DL |
1059 | } |
1060 | ||
a16db099 | 1061 | void igmp_group_delete_empty_include(struct gm_group *group) |
12e41d03 | 1062 | { |
df5dfb77 DL |
1063 | assert(!group->group_filtermode_isexcl); |
1064 | assert(!listcount(group->group_source_list)); | |
12e41d03 | 1065 | |
d62a17ae | 1066 | igmp_group_delete(group); |
12e41d03 DL |
1067 | } |
1068 | ||
c5f76fad | 1069 | void igmp_sock_free(struct gm_sock *igmp) |
12e41d03 | 1070 | { |
df5dfb77 DL |
1071 | assert(!igmp->t_igmp_read); |
1072 | assert(!igmp->t_igmp_query_timer); | |
1073 | assert(!igmp->t_other_querier_timer); | |
12e41d03 | 1074 | |
d62a17ae | 1075 | XFREE(MTYPE_PIM_IGMP_SOCKET, igmp); |
12e41d03 DL |
1076 | } |
1077 | ||
c5f76fad | 1078 | void igmp_sock_delete(struct gm_sock *igmp) |
12e41d03 | 1079 | { |
d62a17ae | 1080 | struct pim_interface *pim_ifp; |
12e41d03 | 1081 | |
d62a17ae | 1082 | sock_close(igmp); |
12e41d03 | 1083 | |
d62a17ae | 1084 | pim_ifp = igmp->interface->info; |
12e41d03 | 1085 | |
18adcff1 | 1086 | listnode_delete(pim_ifp->gm_socket_list, igmp); |
12e41d03 | 1087 | |
d62a17ae | 1088 | igmp_sock_free(igmp); |
dda4d23c | 1089 | |
18adcff1 | 1090 | if (!listcount(pim_ifp->gm_socket_list)) |
dda4d23c | 1091 | pim_igmp_if_reset(pim_ifp); |
12e41d03 DL |
1092 | } |
1093 | ||
d62a17ae | 1094 | void igmp_sock_delete_all(struct interface *ifp) |
cb24fec4 | 1095 | { |
d62a17ae | 1096 | struct pim_interface *pim_ifp; |
1097 | struct listnode *igmp_node, *igmp_nextnode; | |
c5f76fad | 1098 | struct gm_sock *igmp; |
cb24fec4 | 1099 | |
d62a17ae | 1100 | pim_ifp = ifp->info; |
cb24fec4 | 1101 | |
18adcff1 | 1102 | for (ALL_LIST_ELEMENTS(pim_ifp->gm_socket_list, igmp_node, |
29e58225 | 1103 | igmp_nextnode, igmp)) { |
d62a17ae | 1104 | igmp_sock_delete(igmp); |
1105 | } | |
cb24fec4 DS |
1106 | } |
1107 | ||
d8b87afe | 1108 | static unsigned int igmp_group_hash_key(const void *arg) |
6345a326 | 1109 | { |
a16db099 | 1110 | const struct gm_group *group = arg; |
6345a326 | 1111 | |
d62a17ae | 1112 | return jhash_1word(group->group_addr.s_addr, 0); |
6345a326 DS |
1113 | } |
1114 | ||
74df8d6d | 1115 | static bool igmp_group_hash_equal(const void *arg1, const void *arg2) |
6345a326 | 1116 | { |
a16db099 SG |
1117 | const struct gm_group *g1 = (const struct gm_group *)arg1; |
1118 | const struct gm_group *g2 = (const struct gm_group *)arg2; | |
6345a326 | 1119 | |
d62a17ae | 1120 | if (g1->group_addr.s_addr == g2->group_addr.s_addr) |
74df8d6d | 1121 | return true; |
6345a326 | 1122 | |
74df8d6d | 1123 | return false; |
6345a326 DS |
1124 | } |
1125 | ||
dda4d23c DL |
1126 | void pim_igmp_if_init(struct pim_interface *pim_ifp, struct interface *ifp) |
1127 | { | |
1128 | char hash_name[64]; | |
1129 | ||
18adcff1 SG |
1130 | pim_ifp->gm_socket_list = list_new(); |
1131 | pim_ifp->gm_socket_list->del = (void (*)(void *))igmp_sock_free; | |
dda4d23c | 1132 | |
18adcff1 SG |
1133 | pim_ifp->gm_group_list = list_new(); |
1134 | pim_ifp->gm_group_list->del = (void (*)(void *))igmp_group_free; | |
dda4d23c | 1135 | |
a1a4295a | 1136 | snprintf(hash_name, sizeof(hash_name), "IGMP %s hash", ifp->name); |
18adcff1 SG |
1137 | pim_ifp->gm_group_hash = hash_create(igmp_group_hash_key, |
1138 | igmp_group_hash_equal, hash_name); | |
dda4d23c DL |
1139 | } |
1140 | ||
1141 | void pim_igmp_if_reset(struct pim_interface *pim_ifp) | |
1142 | { | |
1143 | struct listnode *grp_node, *grp_nextnode; | |
a16db099 | 1144 | struct gm_group *grp; |
dda4d23c | 1145 | |
18adcff1 | 1146 | for (ALL_LIST_ELEMENTS(pim_ifp->gm_group_list, grp_node, grp_nextnode, |
dda4d23c DL |
1147 | grp)) { |
1148 | igmp_group_delete(grp); | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | void pim_igmp_if_fini(struct pim_interface *pim_ifp) | |
1153 | { | |
1154 | pim_igmp_if_reset(pim_ifp); | |
1155 | ||
18adcff1 SG |
1156 | assert(pim_ifp->gm_group_list); |
1157 | assert(!listcount(pim_ifp->gm_group_list)); | |
dda4d23c | 1158 | |
18adcff1 SG |
1159 | list_delete(&pim_ifp->gm_group_list); |
1160 | hash_free(pim_ifp->gm_group_hash); | |
dda4d23c | 1161 | |
18adcff1 | 1162 | list_delete(&pim_ifp->gm_socket_list); |
dda4d23c DL |
1163 | } |
1164 | ||
c5f76fad SG |
1165 | static struct gm_sock *igmp_sock_new(int fd, struct in_addr ifaddr, |
1166 | struct interface *ifp, int mtrace_only) | |
12e41d03 | 1167 | { |
d62a17ae | 1168 | struct pim_interface *pim_ifp; |
c5f76fad | 1169 | struct gm_sock *igmp; |
d62a17ae | 1170 | |
1171 | pim_ifp = ifp->info; | |
1172 | ||
1173 | if (PIM_DEBUG_IGMP_TRACE) { | |
1174 | zlog_debug( | |
ee2bbf7c MS |
1175 | "Creating IGMP socket fd=%d for address %pI4 on interface %s", |
1176 | fd, &ifaddr, ifp->name); | |
d62a17ae | 1177 | } |
1178 | ||
1179 | igmp = XCALLOC(MTYPE_PIM_IGMP_SOCKET, sizeof(*igmp)); | |
d62a17ae | 1180 | |
d62a17ae | 1181 | igmp->fd = fd; |
1182 | igmp->interface = ifp; | |
1183 | igmp->ifaddr = ifaddr; | |
9a7cee26 | 1184 | igmp->querier_addr = ifaddr; |
d62a17ae | 1185 | igmp->t_igmp_read = NULL; |
1186 | igmp->t_igmp_query_timer = NULL; | |
1187 | igmp->t_other_querier_timer = NULL; /* no other querier present */ | |
1188 | igmp->querier_robustness_variable = | |
18adcff1 | 1189 | pim_ifp->gm_default_robustness_variable; |
d62a17ae | 1190 | igmp->sock_creation = pim_time_monotonic_sec(); |
1191 | ||
f2058cb4 | 1192 | igmp_stats_init(&igmp->igmp_stats); |
21313cbf | 1193 | |
f83f3966 MS |
1194 | if (mtrace_only) { |
1195 | igmp->mtrace_only = mtrace_only; | |
1196 | return igmp; | |
1197 | } | |
1198 | ||
1199 | igmp->mtrace_only = false; | |
1200 | ||
d62a17ae | 1201 | /* |
1202 | igmp_startup_mode_on() will reset QQI: | |
1203 | ||
18adcff1 | 1204 | igmp->querier_query_interval = pim_ifp->gm_default_query_interval; |
d62a17ae | 1205 | */ |
1206 | igmp_startup_mode_on(igmp); | |
1207 | pim_igmp_general_query_on(igmp); | |
1208 | ||
1209 | return igmp; | |
12e41d03 DL |
1210 | } |
1211 | ||
c5f76fad | 1212 | static void igmp_read_on(struct gm_sock *igmp); |
7923d317 | 1213 | |
cc9f21da | 1214 | static void pim_igmp_read(struct thread *t) |
7923d317 | 1215 | { |
d62a17ae | 1216 | uint8_t buf[10000]; |
c5f76fad | 1217 | struct gm_sock *igmp = (struct gm_sock *)THREAD_ARG(t); |
023d3e4a BG |
1218 | struct sockaddr_storage from; |
1219 | struct sockaddr_storage to; | |
d62a17ae | 1220 | socklen_t fromlen = sizeof(from); |
1221 | socklen_t tolen = sizeof(to); | |
1222 | ifindex_t ifindex = -1; | |
d62a17ae | 1223 | int len; |
1224 | ||
2e1cc436 | 1225 | while (1) { |
d62a17ae | 1226 | len = pim_socket_recvfromto(igmp->fd, buf, sizeof(buf), &from, |
1227 | &fromlen, &to, &tolen, &ifindex); | |
1228 | if (len < 0) { | |
1229 | if (errno == EINTR) | |
1230 | continue; | |
1231 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
1232 | break; | |
1233 | ||
1234 | goto done; | |
1235 | } | |
7923d317 | 1236 | } |
7923d317 | 1237 | |
d62a17ae | 1238 | done: |
1239 | igmp_read_on(igmp); | |
7923d317 DS |
1240 | } |
1241 | ||
c5f76fad | 1242 | static void igmp_read_on(struct gm_sock *igmp) |
7923d317 DS |
1243 | { |
1244 | ||
d62a17ae | 1245 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { |
1246 | zlog_debug("Scheduling READ event on IGMP socket fd=%d", | |
1247 | igmp->fd); | |
1248 | } | |
36417fcc | 1249 | thread_add_read(router->master, pim_igmp_read, igmp, igmp->fd, |
d62a17ae | 1250 | &igmp->t_igmp_read); |
7923d317 DS |
1251 | } |
1252 | ||
c5f76fad SG |
1253 | struct gm_sock *pim_igmp_sock_add(struct list *igmp_sock_list, |
1254 | struct in_addr ifaddr, struct interface *ifp, | |
1255 | bool mtrace_only) | |
12e41d03 | 1256 | { |
d62a17ae | 1257 | struct pim_interface *pim_ifp; |
c5f76fad | 1258 | struct gm_sock *igmp; |
d05d3f7a | 1259 | struct sockaddr_in sin; |
d62a17ae | 1260 | int fd; |
12e41d03 | 1261 | |
d62a17ae | 1262 | pim_ifp = ifp->info; |
12e41d03 | 1263 | |
d62a17ae | 1264 | fd = igmp_sock_open(ifaddr, ifp, pim_ifp->options); |
1265 | if (fd < 0) { | |
ee2bbf7c MS |
1266 | zlog_warn("Could not open IGMP socket for %pI4 on %s", |
1267 | &ifaddr, ifp->name); | |
d12f46fa | 1268 | return NULL; |
d62a17ae | 1269 | } |
12e41d03 | 1270 | |
d05d3f7a NB |
1271 | sin.sin_family = AF_INET; |
1272 | sin.sin_addr = ifaddr; | |
1273 | sin.sin_port = 0; | |
1274 | if (bind(fd, (struct sockaddr *) &sin, sizeof(sin)) != 0) { | |
262649bd DS |
1275 | zlog_warn("Could not bind IGMP socket for %pI4 on %s: %s(%d)", |
1276 | &ifaddr, ifp->name, strerror(errno), errno); | |
2c85fdd4 DS |
1277 | close(fd); |
1278 | ||
d12f46fa | 1279 | return NULL; |
d05d3f7a NB |
1280 | } |
1281 | ||
f83f3966 | 1282 | igmp = igmp_sock_new(fd, ifaddr, ifp, mtrace_only); |
12e41d03 | 1283 | |
d62a17ae | 1284 | igmp_read_on(igmp); |
7923d317 | 1285 | |
d62a17ae | 1286 | listnode_add(igmp_sock_list, igmp); |
12e41d03 DL |
1287 | |
1288 | #ifdef IGMP_SOCK_DUMP | |
d62a17ae | 1289 | igmp_sock_dump(igmp_sock_array); |
12e41d03 DL |
1290 | #endif |
1291 | ||
d62a17ae | 1292 | return igmp; |
12e41d03 DL |
1293 | } |
1294 | ||
1295 | /* | |
1296 | RFC 3376: 6.5. Switching Router Filter-Modes | |
1297 | ||
1298 | When a router's filter-mode for a group is EXCLUDE and the group | |
1299 | timer expires, the router filter-mode for the group transitions to | |
1300 | INCLUDE. | |
1301 | ||
1302 | A router uses source records with running source timers as its state | |
1303 | for the switch to a filter-mode of INCLUDE. If there are any source | |
1304 | records with source timers greater than zero (i.e., requested to be | |
1305 | forwarded), a router switches to filter-mode of INCLUDE using those | |
1306 | source records. Source records whose timers are zero (from the | |
1307 | previous EXCLUDE mode) are deleted. | |
1308 | */ | |
cc9f21da | 1309 | static void igmp_group_timer(struct thread *t) |
12e41d03 | 1310 | { |
a16db099 | 1311 | struct gm_group *group; |
12e41d03 | 1312 | |
d62a17ae | 1313 | group = THREAD_ARG(t); |
12e41d03 | 1314 | |
d62a17ae | 1315 | if (PIM_DEBUG_IGMP_TRACE) { |
1316 | char group_str[INET_ADDRSTRLEN]; | |
1317 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1318 | sizeof(group_str)); | |
15569c58 | 1319 | zlog_debug("%s: Timer for group %s on interface %s", __func__, |
dda4d23c | 1320 | group_str, group->interface->name); |
d62a17ae | 1321 | } |
12e41d03 | 1322 | |
df5dfb77 | 1323 | assert(group->group_filtermode_isexcl); |
12e41d03 | 1324 | |
d62a17ae | 1325 | group->group_filtermode_isexcl = 0; |
12e41d03 | 1326 | |
d62a17ae | 1327 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ |
1328 | igmp_anysource_forward_stop(group); | |
12e41d03 | 1329 | |
d62a17ae | 1330 | igmp_source_delete_expired(group->group_source_list); |
12e41d03 | 1331 | |
df5dfb77 | 1332 | assert(!group->group_filtermode_isexcl); |
12e41d03 | 1333 | |
d62a17ae | 1334 | /* |
1335 | RFC 3376: 6.2.2. Definition of Group Timers | |
12e41d03 | 1336 | |
d62a17ae | 1337 | If there are no more source records for the group, delete group |
1338 | record. | |
1339 | */ | |
1340 | if (listcount(group->group_source_list) < 1) { | |
1341 | igmp_group_delete_empty_include(group); | |
1342 | } | |
12e41d03 DL |
1343 | } |
1344 | ||
a16db099 | 1345 | static void group_timer_off(struct gm_group *group) |
12e41d03 | 1346 | { |
d62a17ae | 1347 | if (!group->t_group_timer) |
1348 | return; | |
1349 | ||
1350 | if (PIM_DEBUG_IGMP_TRACE) { | |
1351 | char group_str[INET_ADDRSTRLEN]; | |
1352 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1353 | sizeof(group_str)); | |
1354 | zlog_debug("Cancelling TIMER event for group %s on %s", | |
dda4d23c | 1355 | group_str, group->interface->name); |
d62a17ae | 1356 | } |
1357 | THREAD_OFF(group->t_group_timer); | |
12e41d03 DL |
1358 | } |
1359 | ||
a16db099 | 1360 | void igmp_group_timer_on(struct gm_group *group, long interval_msec, |
d62a17ae | 1361 | const char *ifname) |
12e41d03 | 1362 | { |
d62a17ae | 1363 | group_timer_off(group); |
1364 | ||
1365 | if (PIM_DEBUG_IGMP_EVENTS) { | |
1366 | char group_str[INET_ADDRSTRLEN]; | |
1367 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1368 | sizeof(group_str)); | |
1369 | zlog_debug( | |
1370 | "Scheduling %ld.%03ld sec TIMER event for group %s on %s", | |
1371 | interval_msec / 1000, interval_msec % 1000, group_str, | |
1372 | ifname); | |
1373 | } | |
1374 | ||
1375 | /* | |
1376 | RFC 3376: 6.2.2. Definition of Group Timers | |
1377 | ||
1378 | The group timer is only used when a group is in EXCLUDE mode and | |
1379 | it represents the time for the *filter-mode* of the group to | |
1380 | expire and switch to INCLUDE mode. | |
1381 | */ | |
df5dfb77 | 1382 | assert(group->group_filtermode_isexcl); |
d62a17ae | 1383 | |
36417fcc DS |
1384 | thread_add_timer_msec(router->master, igmp_group_timer, group, |
1385 | interval_msec, &group->t_group_timer); | |
12e41d03 DL |
1386 | } |
1387 | ||
c5f76fad | 1388 | struct gm_group *find_group_by_addr(struct gm_sock *igmp, |
a16db099 | 1389 | struct in_addr group_addr) |
12e41d03 | 1390 | { |
a16db099 | 1391 | struct gm_group lookup; |
dda4d23c | 1392 | struct pim_interface *pim_ifp = igmp->interface->info; |
12e41d03 | 1393 | |
d62a17ae | 1394 | lookup.group_addr.s_addr = group_addr.s_addr; |
12e41d03 | 1395 | |
18adcff1 | 1396 | return hash_lookup(pim_ifp->gm_group_hash, &lookup); |
12e41d03 DL |
1397 | } |
1398 | ||
c5f76fad | 1399 | struct gm_group *igmp_add_group_by_addr(struct gm_sock *igmp, |
a16db099 | 1400 | struct in_addr group_addr) |
12e41d03 | 1401 | { |
a16db099 | 1402 | struct gm_group *group; |
dda4d23c | 1403 | struct pim_interface *pim_ifp = igmp->interface->info; |
d62a17ae | 1404 | |
1405 | group = find_group_by_addr(igmp, group_addr); | |
1406 | if (group) { | |
1407 | return group; | |
1408 | } | |
1409 | ||
1410 | if (!pim_is_group_224_4(group_addr)) { | |
1411 | zlog_warn("%s: Group Specified is not part of 224.0.0.0/4", | |
15569c58 | 1412 | __func__); |
d62a17ae | 1413 | return NULL; |
1414 | } | |
1415 | ||
1416 | if (pim_is_group_224_0_0_0_24(group_addr)) { | |
6b5122a0 DS |
1417 | if (PIM_DEBUG_IGMP_TRACE) |
1418 | zlog_debug( | |
ee2bbf7c MS |
1419 | "%s: Group specified %pI4 is part of 224.0.0.0/24", |
1420 | __func__, &group_addr); | |
d62a17ae | 1421 | return NULL; |
1422 | } | |
1423 | /* | |
1424 | Non-existant group is created as INCLUDE {empty}: | |
1425 | ||
1426 | RFC 3376 - 5.1. Action on Change of Interface State | |
1427 | ||
1428 | If no interface state existed for that multicast address before | |
1429 | the change (i.e., the change consisted of creating a new | |
1430 | per-interface record), or if no state exists after the change | |
1431 | (i.e., the change consisted of deleting a per-interface record), | |
1432 | then the "non-existent" state is considered to have a filter mode | |
1433 | of INCLUDE and an empty source list. | |
1434 | */ | |
1435 | ||
1436 | group = XCALLOC(MTYPE_PIM_IGMP_GROUP, sizeof(*group)); | |
d62a17ae | 1437 | |
1438 | group->group_source_list = list_new(); | |
d62a17ae | 1439 | group->group_source_list->del = (void (*)(void *))igmp_source_free; |
1440 | ||
1441 | group->t_group_timer = NULL; | |
1442 | group->t_group_query_retransmit_timer = NULL; | |
1443 | group->group_specific_query_retransmit_count = 0; | |
1444 | group->group_addr = group_addr; | |
dda4d23c | 1445 | group->interface = igmp->interface; |
d62a17ae | 1446 | group->last_igmp_v1_report_dsec = -1; |
1447 | group->last_igmp_v2_report_dsec = -1; | |
1448 | group->group_creation = pim_time_monotonic_sec(); | |
1449 | group->igmp_version = IGMP_DEFAULT_VERSION; | |
1450 | ||
1451 | /* initialize new group as INCLUDE {empty} */ | |
1452 | group->group_filtermode_isexcl = 0; /* 0=INCLUDE, 1=EXCLUDE */ | |
1453 | ||
18adcff1 SG |
1454 | listnode_add(pim_ifp->gm_group_list, group); |
1455 | group = hash_get(pim_ifp->gm_group_hash, group, hash_alloc_intern); | |
d62a17ae | 1456 | |
1457 | if (PIM_DEBUG_IGMP_TRACE) { | |
1458 | char group_str[INET_ADDRSTRLEN]; | |
1459 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1460 | sizeof(group_str)); | |
1461 | zlog_debug( | |
1462 | "Creating new IGMP group %s on socket %d interface %s", | |
1463 | group_str, igmp->fd, igmp->interface->name); | |
1464 | } | |
1465 | ||
dda4d23c | 1466 | igmp_group_count_incr(pim_ifp); |
339f7695 | 1467 | |
d62a17ae | 1468 | /* |
1469 | RFC 3376: 6.2.2. Definition of Group Timers | |
1470 | ||
1471 | The group timer is only used when a group is in EXCLUDE mode and | |
1472 | it represents the time for the *filter-mode* of the group to | |
1473 | expire and switch to INCLUDE mode. | |
1474 | */ | |
df5dfb77 DL |
1475 | assert(!group->group_filtermode_isexcl); /* INCLUDE mode */ |
1476 | assert(!group->t_group_timer); /* group timer == 0 */ | |
d62a17ae | 1477 | |
1478 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
1479 | igmp_anysource_forward_stop(group); | |
1480 | ||
1481 | return group; | |
12e41d03 | 1482 | } |
b05b72e8 | 1483 | |
278912ea DA |
1484 | void igmp_send_query(int igmp_version, struct gm_group *group, char *query_buf, |
1485 | int query_buf_size, int num_sources, | |
1486 | struct in_addr dst_addr, struct in_addr group_addr, | |
d62a17ae | 1487 | int query_max_response_time_dsec, uint8_t s_flag, |
278912ea | 1488 | struct gm_sock *igmp) |
b05b72e8 | 1489 | { |
278912ea DA |
1490 | if (pim_addr_is_any(group_addr) && |
1491 | ntohl(dst_addr.s_addr) == INADDR_ALLHOSTS_GROUP) | |
1492 | igmp->igmp_stats.general_queries_sent++; | |
1493 | else if (group) | |
1494 | igmp->igmp_stats.group_queries_sent++; | |
1495 | ||
d62a17ae | 1496 | if (igmp_version == 3) { |
278912ea DA |
1497 | igmp_v3_send_query(group, igmp->fd, igmp->interface->name, |
1498 | query_buf, query_buf_size, num_sources, | |
1499 | dst_addr, group_addr, | |
d62a17ae | 1500 | query_max_response_time_dsec, s_flag, |
278912ea DA |
1501 | igmp->querier_robustness_variable, |
1502 | igmp->querier_query_interval); | |
d62a17ae | 1503 | } else if (igmp_version == 2) { |
278912ea DA |
1504 | igmp_v2_send_query(group, igmp->fd, igmp->interface->name, |
1505 | query_buf, dst_addr, group_addr, | |
1506 | query_max_response_time_dsec); | |
d62a17ae | 1507 | } |
b05b72e8 | 1508 | } |
6741a5bb | 1509 | |
1510 | void igmp_send_query_on_intf(struct interface *ifp, int igmp_ver) | |
1511 | { | |
1512 | struct pim_interface *pim_ifp = ifp->info; | |
1513 | struct listnode *sock_node = NULL; | |
c5f76fad | 1514 | struct gm_sock *igmp = NULL; |
6741a5bb | 1515 | struct in_addr dst_addr; |
1516 | struct in_addr group_addr; | |
1517 | int query_buf_size; | |
1518 | ||
1519 | if (!igmp_ver) | |
1520 | igmp_ver = 2; | |
1521 | ||
1522 | if (igmp_ver == 3) | |
1523 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; | |
1524 | else | |
1525 | query_buf_size = IGMP_V12_MSG_SIZE; | |
1526 | ||
1527 | dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); | |
1528 | group_addr.s_addr = PIM_NET_INADDR_ANY; | |
1529 | ||
1530 | if (PIM_DEBUG_IGMP_TRACE) | |
18adcff1 | 1531 | zlog_debug("Issuing general query on request on %s", ifp->name); |
6741a5bb | 1532 | |
18adcff1 | 1533 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->gm_socket_list, sock_node, igmp)) { |
6741a5bb | 1534 | |
1535 | char query_buf[query_buf_size]; | |
1536 | ||
278912ea DA |
1537 | igmp_send_query( |
1538 | igmp_ver, 0 /* igmp_group */, query_buf, | |
1539 | sizeof(query_buf), 0 /* num_sources */, dst_addr, | |
1540 | group_addr, pim_ifp->gm_query_max_response_time_dsec, | |
1541 | 1 /* s_flag: always set for general queries */, igmp); | |
6741a5bb | 1542 | } |
1543 | } |