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acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
12e41d03 | 2 | /* |
896014f4 DL |
3 | * PIM for Quagga |
4 | * Copyright (C) 2008 Everton da Silva Marques | |
896014f4 | 5 | */ |
12e41d03 DL |
6 | |
7 | #include <zebra.h> | |
8 | ||
9 | #include "memory.h" | |
74fb6c66 | 10 | #include "prefix.h" |
9df99407 | 11 | #include "if.h" |
6345a326 DS |
12 | #include "hash.h" |
13 | #include "jhash.h" | |
3613d898 | 14 | #include "lib_errors.h" |
12e41d03 DL |
15 | |
16 | #include "pimd.h" | |
993e3d8e | 17 | #include "pim_instance.h" |
12e41d03 | 18 | #include "pim_igmp.h" |
b05b72e8 | 19 | #include "pim_igmpv2.h" |
12e41d03 | 20 | #include "pim_igmpv3.h" |
4d9ad5dc | 21 | #include "pim_igmp_mtrace.h" |
12e41d03 DL |
22 | #include "pim_iface.h" |
23 | #include "pim_sock.h" | |
24 | #include "pim_mroute.h" | |
25 | #include "pim_str.h" | |
26 | #include "pim_util.h" | |
27 | #include "pim_time.h" | |
cd6d2858 DL |
28 | #include "pim_ssm.h" |
29 | #include "pim_tib.h" | |
12e41d03 | 30 | |
a16db099 | 31 | static void group_timer_off(struct gm_group *group); |
cc9f21da | 32 | static void pim_igmp_general_query(struct thread *t); |
12e41d03 | 33 | |
cd6d2858 DL |
34 | void igmp_anysource_forward_start(struct pim_instance *pim, |
35 | struct gm_group *group) | |
36 | { | |
37 | struct gm_source *source; | |
38 | struct in_addr src_addr = {.s_addr = 0}; | |
39 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
40 | assert(group->group_filtermode_isexcl); | |
41 | assert(listcount(group->group_source_list) < 1); | |
42 | ||
43 | source = igmp_get_source_by_addr(group, src_addr, NULL); | |
44 | if (!source) { | |
45 | zlog_warn("%s: Failure to create * source", __func__); | |
46 | return; | |
47 | } | |
48 | ||
49 | igmp_source_forward_start(pim, source); | |
50 | } | |
51 | ||
52 | void igmp_anysource_forward_stop(struct gm_group *group) | |
53 | { | |
54 | struct gm_source *source; | |
55 | struct in_addr star = {.s_addr = 0}; | |
56 | ||
57 | source = igmp_find_source_by_addr(group, star); | |
58 | if (source) | |
59 | igmp_source_forward_stop(source); | |
60 | } | |
61 | ||
62 | static void igmp_source_forward_reevaluate_one(struct pim_instance *pim, | |
261b019f MR |
63 | struct gm_source *source, |
64 | int is_grp_ssm) | |
cd6d2858 DL |
65 | { |
66 | pim_sgaddr sg; | |
67 | struct gm_group *group = source->source_group; | |
cd6d2858 DL |
68 | |
69 | memset(&sg, 0, sizeof(sg)); | |
70 | sg.src = source->source_addr; | |
71 | sg.grp = group->group_addr; | |
72 | ||
261b019f MR |
73 | /** if there is no PIM state **/ |
74 | if (IGMP_SOURCE_TEST_FORWARDING(source->source_flags)) { | |
75 | if (pim_addr_is_any(source->source_addr)) { | |
76 | if (is_grp_ssm) { | |
77 | if (PIM_DEBUG_PIM_EVENTS) | |
78 | zlog_debug( | |
79 | "local membership del for %pSG as G is now SSM", | |
80 | &sg); | |
81 | igmp_source_forward_stop(source); | |
82 | } | |
83 | } else { | |
84 | if (!is_grp_ssm) { | |
85 | if (PIM_DEBUG_PIM_EVENTS) | |
86 | zlog_debug( | |
87 | "local membership del for %pSG as G is now ASM", | |
88 | &sg); | |
89 | igmp_source_forward_stop(source); | |
90 | } | |
cd6d2858 DL |
91 | } |
92 | } else { | |
261b019f | 93 | if (!pim_addr_is_any(source->source_addr) && (is_grp_ssm)) { |
cd6d2858 DL |
94 | if (PIM_DEBUG_PIM_EVENTS) |
95 | zlog_debug( | |
261b019f | 96 | "local membership add for %pSG as G is now SSM", |
cd6d2858 | 97 | &sg); |
261b019f | 98 | igmp_source_forward_start(pim, source); |
cd6d2858 DL |
99 | } |
100 | } | |
101 | } | |
102 | ||
103 | void igmp_source_forward_reevaluate_all(struct pim_instance *pim) | |
104 | { | |
105 | struct interface *ifp; | |
106 | ||
107 | FOR_ALL_INTERFACES (pim->vrf, ifp) { | |
108 | struct pim_interface *pim_ifp = ifp->info; | |
5c13cb9d | 109 | struct listnode *grpnode, *grp_nextnode; |
cd6d2858 DL |
110 | struct gm_group *grp; |
111 | struct pim_ifchannel *ch, *ch_temp; | |
112 | ||
113 | if (!pim_ifp) | |
114 | continue; | |
115 | ||
116 | /* scan igmp groups */ | |
5c13cb9d DA |
117 | for (ALL_LIST_ELEMENTS(pim_ifp->gm_group_list, grpnode, |
118 | grp_nextnode, grp)) { | |
cd6d2858 DL |
119 | struct listnode *srcnode; |
120 | struct gm_source *src; | |
261b019f | 121 | int is_grp_ssm; |
cd6d2858 | 122 | |
6d0a6ede MR |
123 | /* |
124 | * RFC 4604 | |
125 | * section 2.2.1 | |
126 | * EXCLUDE mode does not apply to SSM addresses, | |
127 | * and an SSM-aware router will ignore | |
128 | * MODE_IS_EXCLUDE and CHANGE_TO_EXCLUDE_MODE | |
129 | * requests in the SSM range. | |
130 | */ | |
261b019f MR |
131 | is_grp_ssm = pim_is_grp_ssm(pim, grp->group_addr); |
132 | if (is_grp_ssm && grp->group_filtermode_isexcl) { | |
6d0a6ede MR |
133 | igmp_group_delete(grp); |
134 | } else { | |
135 | /* scan group sources */ | |
136 | for (ALL_LIST_ELEMENTS_RO( | |
137 | grp->group_source_list, srcnode, | |
138 | src)) { | |
261b019f MR |
139 | igmp_source_forward_reevaluate_one( |
140 | pim, src, is_grp_ssm); | |
6d0a6ede MR |
141 | } /* scan group sources */ |
142 | } | |
143 | } /* scan igmp groups */ | |
cd6d2858 DL |
144 | |
145 | RB_FOREACH_SAFE (ch, pim_ifchannel_rb, &pim_ifp->ifchannel_rb, | |
146 | ch_temp) { | |
147 | if (pim_is_grp_ssm(pim, ch->sg.grp)) { | |
148 | if (pim_addr_is_any(ch->sg.src)) | |
149 | pim_ifchannel_delete(ch); | |
150 | } | |
151 | } | |
152 | } /* scan interfaces */ | |
153 | } | |
154 | ||
155 | void igmp_source_forward_start(struct pim_instance *pim, | |
156 | struct gm_source *source) | |
157 | { | |
158 | struct gm_group *group; | |
159 | pim_sgaddr sg; | |
160 | ||
161 | memset(&sg, 0, sizeof(sg)); | |
162 | sg.src = source->source_addr; | |
163 | sg.grp = source->source_group->group_addr; | |
164 | ||
a96d64b0 | 165 | if (PIM_DEBUG_GM_TRACE) { |
cd6d2858 DL |
166 | zlog_debug("%s: (S,G)=%pSG oif=%s fwd=%d", __func__, &sg, |
167 | source->source_group->interface->name, | |
168 | IGMP_SOURCE_TEST_FORWARDING(source->source_flags)); | |
169 | } | |
170 | ||
037a2c2e MR |
171 | /* |
172 | * PIM state should not be allowed for ASM group with valid source | |
173 | * address. | |
174 | */ | |
175 | if ((!pim_is_grp_ssm(pim, source->source_group->group_addr)) && | |
176 | !pim_addr_is_any(source->source_addr)) { | |
177 | zlog_warn( | |
178 | "%s: (S,G)=%pSG ASM range having source address, not allowed to create PIM state", | |
179 | __func__, &sg); | |
180 | return; | |
181 | } | |
182 | ||
cd6d2858 DL |
183 | /* Prevent IGMP interface from installing multicast route multiple |
184 | times */ | |
185 | if (IGMP_SOURCE_TEST_FORWARDING(source->source_flags)) { | |
186 | return; | |
187 | } | |
188 | ||
189 | group = source->source_group; | |
190 | ||
191 | if (tib_sg_gm_join(pim, sg, group->interface, | |
192 | &source->source_channel_oil)) | |
193 | IGMP_SOURCE_DO_FORWARDING(source->source_flags); | |
194 | } | |
195 | ||
196 | /* | |
07b12758 DS |
197 | igmp_source_forward_stop: stop forwarding, but keep the source |
198 | igmp_source_delete: stop forwarding, and delete the source | |
cd6d2858 DL |
199 | */ |
200 | void igmp_source_forward_stop(struct gm_source *source) | |
201 | { | |
202 | struct pim_interface *pim_oif; | |
203 | struct gm_group *group; | |
204 | pim_sgaddr sg; | |
205 | ||
206 | memset(&sg, 0, sizeof(sg)); | |
207 | sg.src = source->source_addr; | |
208 | sg.grp = source->source_group->group_addr; | |
209 | ||
a96d64b0 | 210 | if (PIM_DEBUG_GM_TRACE) { |
cd6d2858 DL |
211 | zlog_debug("%s: (S,G)=%pSG oif=%s fwd=%d", __func__, &sg, |
212 | source->source_group->interface->name, | |
213 | IGMP_SOURCE_TEST_FORWARDING(source->source_flags)); | |
214 | } | |
215 | ||
216 | /* Prevent IGMP interface from removing multicast route multiple | |
217 | times */ | |
218 | if (!IGMP_SOURCE_TEST_FORWARDING(source->source_flags)) { | |
219 | return; | |
220 | } | |
221 | ||
222 | group = source->source_group; | |
223 | pim_oif = group->interface->info; | |
224 | ||
225 | tib_sg_gm_prune(pim_oif->pim, sg, group->interface, | |
226 | &source->source_channel_oil); | |
227 | IGMP_SOURCE_DONT_FORWARDING(source->source_flags); | |
228 | } | |
229 | ||
b05b72e8 DW |
230 | /* This socket is used for TXing IGMP packets only, IGMP RX happens |
231 | * in pim_mroute_msg() | |
232 | */ | |
4f977c8e | 233 | static int igmp_sock_open(struct in_addr ifaddr, struct interface *ifp) |
12e41d03 | 234 | { |
d62a17ae | 235 | int fd; |
236 | int join = 0; | |
237 | struct in_addr group; | |
f2058cb4 | 238 | struct pim_interface *pim_ifp = ifp->info; |
d62a17ae | 239 | |
240 | fd = pim_socket_mcast(IPPROTO_IGMP, ifaddr, ifp, 1); | |
241 | ||
242 | if (fd < 0) | |
243 | return -1; | |
244 | ||
b6fcc0b7 DL |
245 | if (inet_aton(PIM_ALL_ROUTERS, &group)) { |
246 | if (!pim_socket_join(fd, group, ifaddr, ifp->ifindex, pim_ifp)) | |
247 | ++join; | |
248 | } else { | |
249 | zlog_warn( | |
250 | "%s %s: IGMP socket fd=%d interface %pI4: could not solve %s to group address: errno=%d: %s", | |
251 | __FILE__, __func__, fd, &ifaddr, PIM_ALL_ROUTERS, errno, | |
252 | safe_strerror(errno)); | |
d62a17ae | 253 | } |
254 | ||
255 | /* | |
256 | IGMP routers periodically send IGMP general queries to | |
257 | AllSystems=224.0.0.1 | |
258 | IGMP routers must receive general queries for querier election. | |
259 | */ | |
260 | if (inet_aton(PIM_ALL_SYSTEMS, &group)) { | |
f2058cb4 | 261 | if (!pim_socket_join(fd, group, ifaddr, ifp->ifindex, pim_ifp)) |
d62a17ae | 262 | ++join; |
263 | } else { | |
264 | zlog_warn( | |
ee2bbf7c MS |
265 | "%s %s: IGMP socket fd=%d interface %pI4: could not solve %s to group address: errno=%d: %s", |
266 | __FILE__, __func__, fd, &ifaddr, | |
d62a17ae | 267 | PIM_ALL_SYSTEMS, errno, safe_strerror(errno)); |
268 | } | |
269 | ||
270 | if (inet_aton(PIM_ALL_IGMP_ROUTERS, &group)) { | |
f2058cb4 DA |
271 | if (!pim_socket_join(fd, group, ifaddr, ifp->ifindex, |
272 | pim_ifp)) { | |
d62a17ae | 273 | ++join; |
274 | } | |
275 | } else { | |
276 | zlog_warn( | |
ee2bbf7c MS |
277 | "%s %s: IGMP socket fd=%d interface %pI4: could not solve %s to group address: errno=%d: %s", |
278 | __FILE__, __func__, fd, &ifaddr, | |
d62a17ae | 279 | PIM_ALL_IGMP_ROUTERS, errno, safe_strerror(errno)); |
280 | } | |
281 | ||
282 | if (!join) { | |
09c866e3 | 283 | flog_err_sys( |
450971aa | 284 | EC_LIB_SOCKET, |
ee2bbf7c MS |
285 | "IGMP socket fd=%d could not join any group on interface address %pI4", |
286 | fd, &ifaddr); | |
d62a17ae | 287 | close(fd); |
288 | fd = -1; | |
289 | } | |
290 | ||
291 | return fd; | |
12e41d03 DL |
292 | } |
293 | ||
294 | #undef IGMP_SOCK_DUMP | |
295 | ||
296 | #ifdef IGMP_SOCK_DUMP | |
297 | static void igmp_sock_dump(array_t *igmp_sock_array) | |
298 | { | |
d62a17ae | 299 | int size = array_size(igmp_sock_array); |
300 | for (int i = 0; i < size; ++i) { | |
301 | ||
c5f76fad | 302 | struct gm_sock *igmp = array_get(igmp_sock_array, i); |
d62a17ae | 303 | |
ee2bbf7c MS |
304 | zlog_debug("%s %s: [%d/%d] igmp_addr=%pI4 fd=%d", __FILE__, |
305 | __func__, i, size, &igmp->ifaddr, | |
15569c58 | 306 | igmp->fd); |
d62a17ae | 307 | } |
12e41d03 DL |
308 | } |
309 | #endif | |
310 | ||
c5f76fad SG |
311 | struct gm_sock *pim_igmp_sock_lookup_ifaddr(struct list *igmp_sock_list, |
312 | struct in_addr ifaddr) | |
12e41d03 | 313 | { |
d62a17ae | 314 | struct listnode *sock_node; |
c5f76fad | 315 | struct gm_sock *igmp; |
12e41d03 DL |
316 | |
317 | #ifdef IGMP_SOCK_DUMP | |
d62a17ae | 318 | igmp_sock_dump(igmp_sock_list); |
12e41d03 DL |
319 | #endif |
320 | ||
d62a17ae | 321 | for (ALL_LIST_ELEMENTS_RO(igmp_sock_list, sock_node, igmp)) |
322 | if (ifaddr.s_addr == igmp->ifaddr.s_addr) | |
323 | return igmp; | |
12e41d03 | 324 | |
d12f46fa | 325 | return NULL; |
12e41d03 DL |
326 | } |
327 | ||
cc9f21da | 328 | static void pim_igmp_other_querier_expire(struct thread *t) |
12e41d03 | 329 | { |
c5f76fad | 330 | struct gm_sock *igmp; |
d62a17ae | 331 | |
332 | igmp = THREAD_ARG(t); | |
333 | ||
df5dfb77 | 334 | assert(!igmp->t_igmp_query_timer); |
d62a17ae | 335 | |
a96d64b0 | 336 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 337 | char ifaddr_str[INET_ADDRSTRLEN]; |
338 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
339 | sizeof(ifaddr_str)); | |
15569c58 | 340 | zlog_debug("%s: Querier %s resuming", __func__, ifaddr_str); |
d62a17ae | 341 | } |
9a7cee26 | 342 | /* Mark the interface address as querier address */ |
343 | igmp->querier_addr = igmp->ifaddr; | |
d62a17ae | 344 | |
345 | /* | |
346 | We are the current querier, then | |
347 | re-start sending general queries. | |
348 | RFC 2236 - sec 7 Other Querier | |
349 | present timer expired (Send General | |
350 | Query, Set Gen. Query. timer) | |
351 | */ | |
352 | pim_igmp_general_query(t); | |
12e41d03 DL |
353 | } |
354 | ||
c5f76fad | 355 | void pim_igmp_other_querier_timer_on(struct gm_sock *igmp) |
12e41d03 | 356 | { |
d62a17ae | 357 | long other_querier_present_interval_msec; |
358 | struct pim_interface *pim_ifp; | |
359 | ||
df5dfb77 DL |
360 | assert(igmp); |
361 | assert(igmp->interface); | |
362 | assert(igmp->interface->info); | |
d62a17ae | 363 | |
364 | pim_ifp = igmp->interface->info; | |
365 | ||
366 | if (igmp->t_other_querier_timer) { | |
367 | /* | |
368 | There is other querier present already, | |
369 | then reset the other-querier-present timer. | |
370 | */ | |
371 | ||
a96d64b0 | 372 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 373 | char ifaddr_str[INET_ADDRSTRLEN]; |
374 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
375 | sizeof(ifaddr_str)); | |
376 | zlog_debug( | |
377 | "Querier %s resetting TIMER event for Other-Querier-Present", | |
378 | ifaddr_str); | |
379 | } | |
380 | THREAD_OFF(igmp->t_other_querier_timer); | |
381 | } else { | |
382 | /* | |
383 | We are the current querier, then stop sending general queries: | |
384 | igmp->t_igmp_query_timer = NULL; | |
385 | */ | |
386 | pim_igmp_general_query_off(igmp); | |
387 | } | |
388 | ||
389 | /* | |
390 | Since this socket is starting the other-querier-present timer, | |
391 | there should not be periodic query timer for this socket. | |
392 | */ | |
df5dfb77 | 393 | assert(!igmp->t_igmp_query_timer); |
d62a17ae | 394 | |
395 | /* | |
396 | RFC 3376: 8.5. Other Querier Present Interval | |
397 | ||
398 | The Other Querier Present Interval is the length of time that must | |
399 | pass before a multicast router decides that there is no longer | |
400 | another multicast router which should be the querier. This value | |
401 | MUST be ((the Robustness Variable) times (the Query Interval)) plus | |
402 | (one half of one Query Response Interval). | |
403 | ||
404 | other_querier_present_interval_msec = \ | |
405 | igmp->querier_robustness_variable * \ | |
406 | 1000 * igmp->querier_query_interval + \ | |
407 | 100 * (pim_ifp->query_max_response_time_dsec >> 1); | |
408 | */ | |
409 | other_querier_present_interval_msec = PIM_IGMP_OQPI_MSEC( | |
410 | igmp->querier_robustness_variable, igmp->querier_query_interval, | |
18adcff1 | 411 | pim_ifp->gm_query_max_response_time_dsec); |
d62a17ae | 412 | |
a96d64b0 | 413 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 414 | char ifaddr_str[INET_ADDRSTRLEN]; |
415 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
416 | sizeof(ifaddr_str)); | |
417 | zlog_debug( | |
418 | "Querier %s scheduling %ld.%03ld sec TIMER event for Other-Querier-Present", | |
419 | ifaddr_str, other_querier_present_interval_msec / 1000, | |
420 | other_querier_present_interval_msec % 1000); | |
421 | } | |
422 | ||
36417fcc DS |
423 | thread_add_timer_msec(router->master, pim_igmp_other_querier_expire, |
424 | igmp, other_querier_present_interval_msec, | |
d62a17ae | 425 | &igmp->t_other_querier_timer); |
12e41d03 DL |
426 | } |
427 | ||
c5f76fad | 428 | void pim_igmp_other_querier_timer_off(struct gm_sock *igmp) |
12e41d03 | 429 | { |
df5dfb77 | 430 | assert(igmp); |
d62a17ae | 431 | |
a96d64b0 | 432 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 433 | if (igmp->t_other_querier_timer) { |
434 | char ifaddr_str[INET_ADDRSTRLEN]; | |
435 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
436 | sizeof(ifaddr_str)); | |
437 | zlog_debug( | |
438 | "IGMP querier %s fd=%d cancelling other-querier-present TIMER event on %s", | |
439 | ifaddr_str, igmp->fd, igmp->interface->name); | |
440 | } | |
441 | } | |
442 | THREAD_OFF(igmp->t_other_querier_timer); | |
12e41d03 DL |
443 | } |
444 | ||
9041c30a MR |
445 | int igmp_validate_checksum(char *igmp_msg, int igmp_msg_len) |
446 | { | |
447 | uint16_t recv_checksum; | |
448 | uint16_t checksum; | |
449 | ||
450 | IGMP_GET_INT16((unsigned char *)(igmp_msg + IGMP_CHECKSUM_OFFSET), | |
451 | recv_checksum); | |
452 | ||
453 | /* Clear the checksum field */ | |
454 | memset(igmp_msg + IGMP_CHECKSUM_OFFSET, 0, 2); | |
455 | ||
456 | checksum = in_cksum(igmp_msg, igmp_msg_len); | |
457 | if (ntohs(checksum) != recv_checksum) { | |
458 | zlog_warn("Invalid checksum received %x, calculated %x", | |
459 | recv_checksum, ntohs(checksum)); | |
460 | return -1; | |
461 | } | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
c5f76fad | 466 | static int igmp_recv_query(struct gm_sock *igmp, int query_version, |
d62a17ae | 467 | int max_resp_code, struct in_addr from, |
468 | const char *from_str, char *igmp_msg, | |
469 | int igmp_msg_len) | |
12e41d03 | 470 | { |
d62a17ae | 471 | struct interface *ifp; |
472 | struct pim_interface *pim_ifp; | |
473 | struct in_addr group_addr; | |
d62a17ae | 474 | |
f83f3966 MS |
475 | if (igmp->mtrace_only) |
476 | return 0; | |
477 | ||
d62a17ae | 478 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
479 | ||
480 | ifp = igmp->interface; | |
481 | pim_ifp = ifp->info; | |
482 | ||
9041c30a | 483 | if (igmp_validate_checksum(igmp_msg, igmp_msg_len) == -1) { |
d62a17ae | 484 | zlog_warn( |
9041c30a MR |
485 | "Recv IGMP query v%d from %s on %s with invalid checksum", |
486 | query_version, from_str, ifp->name); | |
d62a17ae | 487 | return -1; |
488 | } | |
489 | ||
8890b440 | 490 | if (!pim_if_connected_to_source(ifp, from)) { |
55eb347d | 491 | if (PIM_DEBUG_GM_PACKETS) |
8890b440 DS |
492 | zlog_debug("Recv IGMP query on interface: %s from a non-connected source: %s", |
493 | ifp->name, from_str); | |
494 | return 0; | |
495 | } | |
496 | ||
096f7609 | 497 | if (if_address_is_local(&from, AF_INET, ifp->vrf->vrf_id)) { |
55eb347d | 498 | if (PIM_DEBUG_GM_PACKETS) |
26a0f1e2 DS |
499 | zlog_debug("Recv IGMP query on interface: %s from ourself %s", |
500 | ifp->name, from_str); | |
501 | return 0; | |
502 | } | |
503 | ||
21313cbf MS |
504 | /* Collecting IGMP Rx stats */ |
505 | switch (query_version) { | |
506 | case 1: | |
f2058cb4 | 507 | igmp->igmp_stats.query_v1++; |
21313cbf MS |
508 | break; |
509 | case 2: | |
f2058cb4 | 510 | igmp->igmp_stats.query_v2++; |
21313cbf MS |
511 | break; |
512 | case 3: | |
f2058cb4 | 513 | igmp->igmp_stats.query_v3++; |
21313cbf MS |
514 | break; |
515 | default: | |
f2058cb4 | 516 | igmp->igmp_stats.unsupported++; |
21313cbf MS |
517 | } |
518 | ||
b0f525a8 QY |
519 | /* |
520 | * RFC 3376 defines some guidelines on operating in backwards | |
521 | * compatibility with older versions of IGMP but there are some gaps in | |
522 | * the logic: | |
d62a17ae | 523 | * |
524 | * - once we drop from say version 3 to version 2 we will never go back | |
b0f525a8 QY |
525 | * to version 3 even if the node that TXed an IGMP v2 query upgrades |
526 | * to v3 | |
d62a17ae | 527 | * |
528 | * - The node with the lowest IP is the querier so we will only know to | |
b0f525a8 QY |
529 | * drop from v3 to v2 if the node that is the querier is also the one |
530 | * that is running igmp v2. If a non-querier only supports igmp v2 | |
531 | * we will have no way of knowing. | |
d62a17ae | 532 | * |
533 | * For now we will simplify things and inform the user that they need to | |
534 | * configure all PIM routers to use the same version of IGMP. | |
535 | */ | |
29e58225 | 536 | if (query_version != pim_ifp->igmp_version) { |
d62a17ae | 537 | zlog_warn( |
3efd0893 | 538 | "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 |
539 | query_version, from_str, ifp->name, |
540 | pim_ifp->igmp_version); | |
d62a17ae | 541 | return 0; |
542 | } | |
543 | ||
55eb347d | 544 | if (PIM_DEBUG_GM_PACKETS) { |
d62a17ae | 545 | char group_str[INET_ADDRSTRLEN]; |
546 | pim_inet4_dump("<group?>", group_addr, group_str, | |
547 | sizeof(group_str)); | |
548 | zlog_debug("Recv IGMP query v%d from %s on %s for group %s", | |
549 | query_version, from_str, ifp->name, group_str); | |
550 | } | |
551 | ||
552 | /* | |
553 | RFC 3376: 6.6.2. Querier Election | |
554 | ||
555 | When a router receives a query with a lower IP address, it sets | |
556 | the Other-Querier-Present timer to Other Querier Present Interval | |
557 | and ceases to send queries on the network if it was the previously | |
558 | elected querier. | |
559 | */ | |
560 | if (ntohl(from.s_addr) < ntohl(igmp->ifaddr.s_addr)) { | |
561 | ||
5bc4a46b MR |
562 | /* As per RFC 2236 section 3: |
563 | * When a Querier receives a Leave Group message for a group | |
564 | * that has group members on the reception interface, it sends | |
565 | * [Last Member Query Count] Group-Specific Queries every [Last | |
566 | * Member Query Interval] to the group being left. These | |
567 | * Group-Specific Queries have their Max Response time set to | |
568 | * [Last Member Query Interval]. If no Reports are received | |
569 | * after the response time of the last query expires, the | |
570 | * routers assume that the group has no local members, as above. | |
571 | * Any Querier to non-Querier transition is ignored during this | |
572 | * time; the same router keeps sending the Group-Specific | |
573 | * Queries. | |
574 | */ | |
8d9e46a7 MR |
575 | const struct gm_group *group; |
576 | const struct listnode *grpnode; | |
577 | ||
578 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->gm_group_list, grpnode, | |
579 | group)) { | |
580 | if (!group->t_group_query_retransmit_timer) | |
581 | continue; | |
5bc4a46b | 582 | |
a96d64b0 | 583 | if (PIM_DEBUG_GM_TRACE) |
5bc4a46b MR |
584 | zlog_debug( |
585 | "%s: lower address query packet from %s is ignored when last member query interval timer is running", | |
586 | ifp->name, from_str); | |
587 | return 0; | |
588 | } | |
589 | ||
a96d64b0 | 590 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 591 | char ifaddr_str[INET_ADDRSTRLEN]; |
592 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
593 | sizeof(ifaddr_str)); | |
594 | zlog_debug( | |
595 | "%s: local address %s (%u) lost querier election to %s (%u)", | |
596 | ifp->name, ifaddr_str, | |
597 | ntohl(igmp->ifaddr.s_addr), from_str, | |
598 | ntohl(from.s_addr)); | |
599 | } | |
a0625bb3 MR |
600 | /* Reset the other querier timer only if query is received from |
601 | * the previously elected querier or a better new querier | |
602 | * This will make sure that non-querier elects the new querier | |
603 | * whose ip address is higher than the old querier | |
604 | * in case the old querier goes down via other querier present | |
605 | * timer expiry | |
606 | */ | |
607 | if (ntohl(from.s_addr) <= ntohl(igmp->querier_addr.s_addr)) { | |
9a7cee26 | 608 | igmp->querier_addr.s_addr = from.s_addr; |
a0625bb3 MR |
609 | pim_igmp_other_querier_timer_on(igmp); |
610 | } | |
d62a17ae | 611 | } |
612 | ||
613 | /* IGMP version 3 is the only one where we process the RXed query */ | |
614 | if (query_version == 3) { | |
615 | igmp_v3_recv_query(igmp, from_str, igmp_msg); | |
616 | } | |
617 | ||
618 | return 0; | |
12e41d03 DL |
619 | } |
620 | ||
d62a17ae | 621 | static void on_trace(const char *label, struct interface *ifp, |
622 | struct in_addr from) | |
12e41d03 | 623 | { |
a96d64b0 | 624 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 625 | char from_str[INET_ADDRSTRLEN]; |
626 | pim_inet4_dump("<from?>", from, from_str, sizeof(from_str)); | |
627 | zlog_debug("%s: from %s on %s", label, from_str, ifp->name); | |
628 | } | |
12e41d03 DL |
629 | } |
630 | ||
c5f76fad | 631 | static int igmp_v1_recv_report(struct gm_sock *igmp, struct in_addr from, |
d62a17ae | 632 | const char *from_str, char *igmp_msg, |
633 | int igmp_msg_len) | |
12e41d03 | 634 | { |
d62a17ae | 635 | struct interface *ifp = igmp->interface; |
a16db099 | 636 | struct gm_group *group; |
d62a17ae | 637 | struct in_addr group_addr; |
12e41d03 | 638 | |
15569c58 | 639 | on_trace(__func__, igmp->interface, from); |
12e41d03 | 640 | |
f83f3966 MS |
641 | if (igmp->mtrace_only) |
642 | return 0; | |
643 | ||
d62a17ae | 644 | if (igmp_msg_len != IGMP_V12_MSG_SIZE) { |
645 | zlog_warn( | |
646 | "Recv IGMP report v1 from %s on %s: size=%d other than correct=%d", | |
647 | from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE); | |
648 | return -1; | |
649 | } | |
12e41d03 | 650 | |
9041c30a MR |
651 | if (igmp_validate_checksum(igmp_msg, igmp_msg_len) == -1) { |
652 | zlog_warn( | |
653 | "Recv IGMP report v1 from %s on %s with invalid checksum", | |
654 | from_str, ifp->name); | |
655 | return -1; | |
656 | } | |
657 | ||
21313cbf | 658 | /* Collecting IGMP Rx stats */ |
f2058cb4 | 659 | igmp->igmp_stats.report_v1++; |
21313cbf | 660 | |
a96d64b0 | 661 | if (PIM_DEBUG_GM_TRACE) { |
15569c58 | 662 | zlog_warn("%s %s: FIXME WRITEME", __FILE__, __func__); |
d62a17ae | 663 | } |
12e41d03 | 664 | |
d62a17ae | 665 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
12e41d03 | 666 | |
b0f525a8 QY |
667 | if (pim_is_group_filtered(ifp->info, &group_addr)) |
668 | return -1; | |
669 | ||
b97047ed | 670 | /* non-existent group is created as INCLUDE {empty} */ |
d62a17ae | 671 | group = igmp_add_group_by_addr(igmp, group_addr); |
672 | if (!group) { | |
673 | return -1; | |
674 | } | |
12e41d03 | 675 | |
d62a17ae | 676 | group->last_igmp_v1_report_dsec = pim_time_monotonic_dsec(); |
12e41d03 | 677 | |
d62a17ae | 678 | return 0; |
12e41d03 DL |
679 | } |
680 | ||
88ea79ad | 681 | bool pim_igmp_verify_header(struct ip *ip_hdr, size_t len, size_t *hlen) |
ff4ad870 | 682 | { |
88ea79ad MR |
683 | char *igmp_msg; |
684 | int igmp_msg_len; | |
685 | int msg_type; | |
686 | size_t ip_hlen; /* ip header length in bytes */ | |
687 | ||
ff4ad870 MR |
688 | if (len < sizeof(*ip_hdr)) { |
689 | zlog_warn("IGMP packet size=%zu shorter than minimum=%zu", len, | |
690 | sizeof(*ip_hdr)); | |
691 | return false; | |
692 | } | |
693 | ||
88ea79ad MR |
694 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ |
695 | *hlen = ip_hlen; | |
696 | ||
697 | if (ip_hlen > len) { | |
698 | zlog_warn( | |
699 | "IGMP packet header claims size %zu, but we only have %zu bytes", | |
700 | ip_hlen, len); | |
701 | return false; | |
702 | } | |
703 | ||
704 | igmp_msg = (char *)ip_hdr + ip_hlen; | |
705 | igmp_msg_len = len - ip_hlen; | |
706 | msg_type = *igmp_msg; | |
707 | ||
ff4ad870 MR |
708 | if (igmp_msg_len < PIM_IGMP_MIN_LEN) { |
709 | zlog_warn("IGMP message size=%d shorter than minimum=%d", | |
710 | igmp_msg_len, PIM_IGMP_MIN_LEN); | |
711 | return false; | |
712 | } | |
713 | ||
54d7bf0c MR |
714 | if ((msg_type != PIM_IGMP_MTRACE_RESPONSE) |
715 | && (msg_type != PIM_IGMP_MTRACE_QUERY_REQUEST)) { | |
716 | if (ip_hdr->ip_ttl != 1) { | |
717 | zlog_warn( | |
718 | "Recv IGMP packet with invalid ttl=%u, discarding the packet", | |
719 | ip_hdr->ip_ttl); | |
e748f180 | 720 | return false; |
54d7bf0c MR |
721 | } |
722 | } | |
723 | ||
ff4ad870 MR |
724 | return true; |
725 | } | |
726 | ||
c5f76fad | 727 | int pim_igmp_packet(struct gm_sock *igmp, char *buf, size_t len) |
12e41d03 | 728 | { |
88ea79ad | 729 | struct ip *ip_hdr = (struct ip *)buf; |
d62a17ae | 730 | size_t ip_hlen; /* ip header length in bytes */ |
731 | char *igmp_msg; | |
732 | int igmp_msg_len; | |
733 | int msg_type; | |
734 | char from_str[INET_ADDRSTRLEN]; | |
735 | char to_str[INET_ADDRSTRLEN]; | |
736 | ||
88ea79ad | 737 | if (!pim_igmp_verify_header(ip_hdr, len, &ip_hlen)) |
f08e6750 | 738 | return -1; |
f08e6750 | 739 | |
d62a17ae | 740 | igmp_msg = buf + ip_hlen; |
d62a17ae | 741 | igmp_msg_len = len - ip_hlen; |
f08e6750 QY |
742 | msg_type = *igmp_msg; |
743 | ||
ff4ad870 MR |
744 | pim_inet4_dump("<src?>", ip_hdr->ip_src, from_str, sizeof(from_str)); |
745 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, to_str, sizeof(to_str)); | |
746 | ||
55eb347d | 747 | if (PIM_DEBUG_GM_PACKETS) { |
d62a17ae | 748 | zlog_debug( |
c7e663d6 DS |
749 | "Recv IGMP packet from %s to %s on %s: size=%zu ttl=%d msg_type=%d msg_size=%d", |
750 | from_str, to_str, igmp->interface->name, len, ip_hdr->ip_ttl, | |
d62a17ae | 751 | msg_type, igmp_msg_len); |
752 | } | |
12e41d03 | 753 | |
d62a17ae | 754 | switch (msg_type) { |
755 | case PIM_IGMP_MEMBERSHIP_QUERY: { | |
756 | int max_resp_code = igmp_msg[1]; | |
757 | int query_version; | |
758 | ||
759 | /* | |
760 | RFC 3376: 7.1. Query Version Distinctions | |
761 | IGMPv1 Query: length = 8 octets AND Max Resp Code field is | |
762 | zero | |
763 | IGMPv2 Query: length = 8 octets AND Max Resp Code field is | |
764 | non-zero | |
765 | IGMPv3 Query: length >= 12 octets | |
766 | */ | |
767 | ||
768 | if (igmp_msg_len == 8) { | |
769 | query_version = max_resp_code ? 2 : 1; | |
770 | } else if (igmp_msg_len >= 12) { | |
771 | query_version = 3; | |
772 | } else { | |
773 | zlog_warn("Unknown IGMP query version"); | |
774 | return -1; | |
775 | } | |
776 | ||
777 | return igmp_recv_query(igmp, query_version, max_resp_code, | |
778 | ip_hdr->ip_src, from_str, igmp_msg, | |
779 | igmp_msg_len); | |
780 | } | |
12e41d03 | 781 | |
d62a17ae | 782 | case PIM_IGMP_V3_MEMBERSHIP_REPORT: |
783 | return igmp_v3_recv_report(igmp, ip_hdr->ip_src, from_str, | |
784 | igmp_msg, igmp_msg_len); | |
12e41d03 | 785 | |
d62a17ae | 786 | case PIM_IGMP_V2_MEMBERSHIP_REPORT: |
787 | return igmp_v2_recv_report(igmp, ip_hdr->ip_src, from_str, | |
788 | igmp_msg, igmp_msg_len); | |
12e41d03 | 789 | |
d62a17ae | 790 | case PIM_IGMP_V1_MEMBERSHIP_REPORT: |
791 | return igmp_v1_recv_report(igmp, ip_hdr->ip_src, from_str, | |
792 | igmp_msg, igmp_msg_len); | |
12e41d03 | 793 | |
d62a17ae | 794 | case PIM_IGMP_V2_LEAVE_GROUP: |
d1b61cb9 MR |
795 | return igmp_v2_recv_leave(igmp, ip_hdr, from_str, igmp_msg, |
796 | igmp_msg_len); | |
4d9ad5dc MS |
797 | |
798 | case PIM_IGMP_MTRACE_RESPONSE: | |
799 | return igmp_mtrace_recv_response(igmp, ip_hdr, ip_hdr->ip_src, | |
800 | from_str, igmp_msg, | |
801 | igmp_msg_len); | |
4d9ad5dc MS |
802 | case PIM_IGMP_MTRACE_QUERY_REQUEST: |
803 | return igmp_mtrace_recv_qry_req(igmp, ip_hdr, ip_hdr->ip_src, | |
804 | from_str, igmp_msg, | |
805 | igmp_msg_len); | |
d62a17ae | 806 | } |
12e41d03 | 807 | |
d62a17ae | 808 | zlog_warn("Ignoring unsupported IGMP message type: %d", msg_type); |
809 | ||
21313cbf | 810 | /* Collecting IGMP Rx stats */ |
f2058cb4 | 811 | igmp->igmp_stats.unsupported++; |
21313cbf | 812 | |
d62a17ae | 813 | return -1; |
12e41d03 DL |
814 | } |
815 | ||
c5f76fad | 816 | void pim_igmp_general_query_on(struct gm_sock *igmp) |
12e41d03 | 817 | { |
d62a17ae | 818 | struct pim_interface *pim_ifp; |
819 | int startup_mode; | |
820 | int query_interval; | |
821 | ||
822 | /* | |
823 | Since this socket is starting as querier, | |
824 | there should not exist a timer for other-querier-present. | |
825 | */ | |
df5dfb77 | 826 | assert(!igmp->t_other_querier_timer); |
d62a17ae | 827 | pim_ifp = igmp->interface->info; |
df5dfb77 | 828 | assert(pim_ifp); |
d62a17ae | 829 | |
830 | /* | |
831 | RFC 3376: 8.6. Startup Query Interval | |
832 | ||
833 | The Startup Query Interval is the interval between General Queries | |
834 | sent by a Querier on startup. Default: 1/4 the Query Interval. | |
835 | The first one should be sent out immediately instead of 125/4 | |
836 | seconds from now. | |
837 | */ | |
838 | startup_mode = igmp->startup_query_count > 0; | |
839 | if (startup_mode) { | |
840 | /* | |
841 | * If this is the first time we are sending a query on a | |
842 | * newly configured igmp interface send it out in 1 second | |
843 | * just to give the entire world a tiny bit of time to settle | |
844 | * else the query interval is: | |
18adcff1 | 845 | * query_interval = pim_ifp->gm_default_query_interval >> 2; |
d62a17ae | 846 | */ |
18adcff1 SG |
847 | if (igmp->startup_query_count == |
848 | igmp->querier_robustness_variable) | |
d62a17ae | 849 | query_interval = 1; |
850 | else | |
29e58225 | 851 | query_interval = PIM_IGMP_SQI( |
18adcff1 | 852 | pim_ifp->gm_default_query_interval); |
d62a17ae | 853 | |
854 | --igmp->startup_query_count; | |
855 | } else { | |
856 | query_interval = igmp->querier_query_interval; | |
857 | } | |
858 | ||
a96d64b0 | 859 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 860 | char ifaddr_str[INET_ADDRSTRLEN]; |
861 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
862 | sizeof(ifaddr_str)); | |
863 | zlog_debug( | |
864 | "Querier %s scheduling %d-second (%s) TIMER event for IGMP query on fd=%d", | |
865 | ifaddr_str, query_interval, | |
866 | startup_mode ? "startup" : "non-startup", igmp->fd); | |
867 | } | |
36417fcc DS |
868 | thread_add_timer(router->master, pim_igmp_general_query, igmp, |
869 | query_interval, &igmp->t_igmp_query_timer); | |
12e41d03 DL |
870 | } |
871 | ||
c5f76fad | 872 | void pim_igmp_general_query_off(struct gm_sock *igmp) |
12e41d03 | 873 | { |
df5dfb77 | 874 | assert(igmp); |
d62a17ae | 875 | |
a96d64b0 | 876 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 877 | if (igmp->t_igmp_query_timer) { |
878 | char ifaddr_str[INET_ADDRSTRLEN]; | |
879 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
880 | sizeof(ifaddr_str)); | |
881 | zlog_debug( | |
882 | "IGMP querier %s fd=%d cancelling query TIMER event on %s", | |
883 | ifaddr_str, igmp->fd, igmp->interface->name); | |
884 | } | |
885 | } | |
886 | THREAD_OFF(igmp->t_igmp_query_timer); | |
12e41d03 DL |
887 | } |
888 | ||
889 | /* Issue IGMP general query */ | |
cc9f21da | 890 | static void pim_igmp_general_query(struct thread *t) |
12e41d03 | 891 | { |
c5f76fad | 892 | struct gm_sock *igmp; |
d62a17ae | 893 | struct in_addr dst_addr; |
894 | struct in_addr group_addr; | |
895 | struct pim_interface *pim_ifp; | |
896 | int query_buf_size; | |
897 | ||
898 | igmp = THREAD_ARG(t); | |
899 | ||
df5dfb77 DL |
900 | assert(igmp->interface); |
901 | assert(igmp->interface->info); | |
d62a17ae | 902 | |
903 | pim_ifp = igmp->interface->info; | |
904 | ||
29e58225 | 905 | if (pim_ifp->igmp_version == 3) { |
d62a17ae | 906 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; |
907 | } else { | |
908 | query_buf_size = IGMP_V12_MSG_SIZE; | |
909 | } | |
910 | ||
911 | char query_buf[query_buf_size]; | |
912 | ||
913 | /* | |
914 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
915 | ||
916 | In IGMPv3, General Queries are sent with an IP destination address | |
917 | of 224.0.0.1, the all-systems multicast address. Group-Specific | |
918 | and Group-and-Source-Specific Queries are sent with an IP | |
919 | destination address equal to the multicast address of interest. | |
920 | */ | |
921 | ||
922 | dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); | |
923 | group_addr.s_addr = PIM_NET_INADDR_ANY; | |
924 | ||
a96d64b0 | 925 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 926 | char querier_str[INET_ADDRSTRLEN]; |
927 | char dst_str[INET_ADDRSTRLEN]; | |
928 | pim_inet4_dump("<querier?>", igmp->ifaddr, querier_str, | |
929 | sizeof(querier_str)); | |
930 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
931 | zlog_debug("Querier %s issuing IGMP general query to %s on %s", | |
932 | querier_str, dst_str, igmp->interface->name); | |
933 | } | |
934 | ||
278912ea DA |
935 | igmp_send_query(pim_ifp->igmp_version, 0 /* igmp_group */, query_buf, |
936 | sizeof(query_buf), 0 /* num_sources */, dst_addr, | |
937 | group_addr, pim_ifp->gm_query_max_response_time_dsec, | |
938 | 1 /* s_flag: always set for general queries */, igmp); | |
d62a17ae | 939 | |
940 | pim_igmp_general_query_on(igmp); | |
12e41d03 DL |
941 | } |
942 | ||
c5f76fad | 943 | static void sock_close(struct gm_sock *igmp) |
12e41d03 | 944 | { |
d62a17ae | 945 | pim_igmp_other_querier_timer_off(igmp); |
946 | pim_igmp_general_query_off(igmp); | |
947 | ||
a96d64b0 | 948 | if (PIM_DEBUG_GM_TRACE_DETAIL) { |
d62a17ae | 949 | if (igmp->t_igmp_read) { |
950 | zlog_debug( | |
ee2bbf7c MS |
951 | "Cancelling READ event on IGMP socket %pI4 fd=%d on interface %s", |
952 | &igmp->ifaddr, igmp->fd, | |
d62a17ae | 953 | igmp->interface->name); |
954 | } | |
955 | } | |
956 | THREAD_OFF(igmp->t_igmp_read); | |
957 | ||
958 | if (close(igmp->fd)) { | |
af4c2728 | 959 | flog_err( |
450971aa | 960 | EC_LIB_SOCKET, |
ee2bbf7c MS |
961 | "Failure closing IGMP socket %pI4 fd=%d on interface %s: errno=%d: %s", |
962 | &igmp->ifaddr, igmp->fd, | |
d62a17ae | 963 | igmp->interface->name, errno, safe_strerror(errno)); |
964 | } | |
965 | ||
a96d64b0 | 966 | if (PIM_DEBUG_GM_TRACE_DETAIL) { |
ee2bbf7c MS |
967 | zlog_debug("Deleted IGMP socket %pI4 fd=%d on interface %s", |
968 | &igmp->ifaddr, igmp->fd, | |
d62a17ae | 969 | igmp->interface->name); |
970 | } | |
12e41d03 DL |
971 | } |
972 | ||
c5f76fad | 973 | void igmp_startup_mode_on(struct gm_sock *igmp) |
12e41d03 | 974 | { |
d62a17ae | 975 | struct pim_interface *pim_ifp; |
12e41d03 | 976 | |
d62a17ae | 977 | pim_ifp = igmp->interface->info; |
12e41d03 | 978 | |
d62a17ae | 979 | /* |
980 | RFC 3376: 8.7. Startup Query Count | |
12e41d03 | 981 | |
d62a17ae | 982 | The Startup Query Count is the number of Queries sent out on |
983 | startup, separated by the Startup Query Interval. Default: the | |
984 | Robustness Variable. | |
985 | */ | |
986 | igmp->startup_query_count = igmp->querier_robustness_variable; | |
12e41d03 | 987 | |
d62a17ae | 988 | /* |
989 | Since we're (re)starting, reset QQI to default Query Interval | |
990 | */ | |
18adcff1 | 991 | igmp->querier_query_interval = pim_ifp->gm_default_query_interval; |
12e41d03 DL |
992 | } |
993 | ||
a16db099 | 994 | static void igmp_group_free(struct gm_group *group) |
12e41d03 | 995 | { |
6a154c88 | 996 | list_delete(&group->group_source_list); |
12e41d03 | 997 | |
d62a17ae | 998 | XFREE(MTYPE_PIM_IGMP_GROUP, group); |
12e41d03 DL |
999 | } |
1000 | ||
dda4d23c | 1001 | static void igmp_group_count_incr(struct pim_interface *pim_ifp) |
339f7695 | 1002 | { |
3e5d8665 DA |
1003 | uint32_t group_count = listcount(pim_ifp->gm_group_list); |
1004 | ||
8934215f SG |
1005 | ++pim_ifp->pim->gm_group_count; |
1006 | if (pim_ifp->pim->gm_group_count == pim_ifp->pim->gm_watermark_limit) { | |
339f7695 | 1007 | zlog_warn( |
1008 | "IGMP group count reached watermark limit: %u(vrf: %s)", | |
8934215f | 1009 | pim_ifp->pim->gm_group_count, |
339f7695 | 1010 | VRF_LOGNAME(pim_ifp->pim->vrf)); |
1011 | } | |
3e5d8665 DA |
1012 | |
1013 | if (pim_ifp->igmp_peak_group_count < group_count) | |
1014 | pim_ifp->igmp_peak_group_count = group_count; | |
339f7695 | 1015 | } |
1016 | ||
dda4d23c | 1017 | static void igmp_group_count_decr(struct pim_interface *pim_ifp) |
339f7695 | 1018 | { |
8934215f | 1019 | if (pim_ifp->pim->gm_group_count == 0) { |
339f7695 | 1020 | zlog_warn("Cannot decrement igmp group count below 0(vrf: %s)", |
1021 | VRF_LOGNAME(pim_ifp->pim->vrf)); | |
1022 | return; | |
1023 | } | |
1024 | ||
8934215f | 1025 | --pim_ifp->pim->gm_group_count; |
339f7695 | 1026 | } |
1027 | ||
a16db099 | 1028 | void igmp_group_delete(struct gm_group *group) |
12e41d03 | 1029 | { |
d62a17ae | 1030 | struct listnode *src_node; |
1031 | struct listnode *src_nextnode; | |
51700107 | 1032 | struct gm_source *src; |
dda4d23c | 1033 | struct pim_interface *pim_ifp = group->interface->info; |
d62a17ae | 1034 | |
a96d64b0 | 1035 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 1036 | char group_str[INET_ADDRSTRLEN]; |
1037 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1038 | sizeof(group_str)); | |
dda4d23c DL |
1039 | zlog_debug("Deleting IGMP group %s from interface %s", |
1040 | group_str, group->interface->name); | |
d62a17ae | 1041 | } |
1042 | ||
1043 | for (ALL_LIST_ELEMENTS(group->group_source_list, src_node, src_nextnode, | |
1044 | src)) { | |
1045 | igmp_source_delete(src); | |
1046 | } | |
1047 | ||
28ef0ee1 | 1048 | THREAD_OFF(group->t_group_query_retransmit_timer); |
d62a17ae | 1049 | |
1050 | group_timer_off(group); | |
dda4d23c | 1051 | igmp_group_count_decr(pim_ifp); |
18adcff1 SG |
1052 | listnode_delete(pim_ifp->gm_group_list, group); |
1053 | hash_release(pim_ifp->gm_group_hash, group); | |
d62a17ae | 1054 | |
1055 | igmp_group_free(group); | |
12e41d03 DL |
1056 | } |
1057 | ||
a16db099 | 1058 | void igmp_group_delete_empty_include(struct gm_group *group) |
12e41d03 | 1059 | { |
df5dfb77 DL |
1060 | assert(!group->group_filtermode_isexcl); |
1061 | assert(!listcount(group->group_source_list)); | |
12e41d03 | 1062 | |
d62a17ae | 1063 | igmp_group_delete(group); |
12e41d03 DL |
1064 | } |
1065 | ||
c5f76fad | 1066 | void igmp_sock_free(struct gm_sock *igmp) |
12e41d03 | 1067 | { |
df5dfb77 DL |
1068 | assert(!igmp->t_igmp_read); |
1069 | assert(!igmp->t_igmp_query_timer); | |
1070 | assert(!igmp->t_other_querier_timer); | |
12e41d03 | 1071 | |
d62a17ae | 1072 | XFREE(MTYPE_PIM_IGMP_SOCKET, igmp); |
12e41d03 DL |
1073 | } |
1074 | ||
c5f76fad | 1075 | void igmp_sock_delete(struct gm_sock *igmp) |
12e41d03 | 1076 | { |
d62a17ae | 1077 | struct pim_interface *pim_ifp; |
12e41d03 | 1078 | |
d62a17ae | 1079 | sock_close(igmp); |
12e41d03 | 1080 | |
d62a17ae | 1081 | pim_ifp = igmp->interface->info; |
12e41d03 | 1082 | |
18adcff1 | 1083 | listnode_delete(pim_ifp->gm_socket_list, igmp); |
12e41d03 | 1084 | |
d62a17ae | 1085 | igmp_sock_free(igmp); |
dda4d23c | 1086 | |
18adcff1 | 1087 | if (!listcount(pim_ifp->gm_socket_list)) |
dda4d23c | 1088 | pim_igmp_if_reset(pim_ifp); |
12e41d03 DL |
1089 | } |
1090 | ||
d62a17ae | 1091 | void igmp_sock_delete_all(struct interface *ifp) |
cb24fec4 | 1092 | { |
d62a17ae | 1093 | struct pim_interface *pim_ifp; |
1094 | struct listnode *igmp_node, *igmp_nextnode; | |
c5f76fad | 1095 | struct gm_sock *igmp; |
cb24fec4 | 1096 | |
d62a17ae | 1097 | pim_ifp = ifp->info; |
cb24fec4 | 1098 | |
18adcff1 | 1099 | for (ALL_LIST_ELEMENTS(pim_ifp->gm_socket_list, igmp_node, |
29e58225 | 1100 | igmp_nextnode, igmp)) { |
d62a17ae | 1101 | igmp_sock_delete(igmp); |
1102 | } | |
cb24fec4 DS |
1103 | } |
1104 | ||
d8b87afe | 1105 | static unsigned int igmp_group_hash_key(const void *arg) |
6345a326 | 1106 | { |
a16db099 | 1107 | const struct gm_group *group = arg; |
6345a326 | 1108 | |
d62a17ae | 1109 | return jhash_1word(group->group_addr.s_addr, 0); |
6345a326 DS |
1110 | } |
1111 | ||
74df8d6d | 1112 | static bool igmp_group_hash_equal(const void *arg1, const void *arg2) |
6345a326 | 1113 | { |
a16db099 SG |
1114 | const struct gm_group *g1 = (const struct gm_group *)arg1; |
1115 | const struct gm_group *g2 = (const struct gm_group *)arg2; | |
6345a326 | 1116 | |
d62a17ae | 1117 | if (g1->group_addr.s_addr == g2->group_addr.s_addr) |
74df8d6d | 1118 | return true; |
6345a326 | 1119 | |
74df8d6d | 1120 | return false; |
6345a326 DS |
1121 | } |
1122 | ||
dda4d23c DL |
1123 | void pim_igmp_if_init(struct pim_interface *pim_ifp, struct interface *ifp) |
1124 | { | |
1125 | char hash_name[64]; | |
1126 | ||
18adcff1 SG |
1127 | pim_ifp->gm_socket_list = list_new(); |
1128 | pim_ifp->gm_socket_list->del = (void (*)(void *))igmp_sock_free; | |
dda4d23c | 1129 | |
18adcff1 SG |
1130 | pim_ifp->gm_group_list = list_new(); |
1131 | pim_ifp->gm_group_list->del = (void (*)(void *))igmp_group_free; | |
dda4d23c | 1132 | |
a1a4295a | 1133 | snprintf(hash_name, sizeof(hash_name), "IGMP %s hash", ifp->name); |
18adcff1 SG |
1134 | pim_ifp->gm_group_hash = hash_create(igmp_group_hash_key, |
1135 | igmp_group_hash_equal, hash_name); | |
dda4d23c DL |
1136 | } |
1137 | ||
1138 | void pim_igmp_if_reset(struct pim_interface *pim_ifp) | |
1139 | { | |
1140 | struct listnode *grp_node, *grp_nextnode; | |
a16db099 | 1141 | struct gm_group *grp; |
dda4d23c | 1142 | |
18adcff1 | 1143 | for (ALL_LIST_ELEMENTS(pim_ifp->gm_group_list, grp_node, grp_nextnode, |
dda4d23c DL |
1144 | grp)) { |
1145 | igmp_group_delete(grp); | |
1146 | } | |
1147 | } | |
1148 | ||
1149 | void pim_igmp_if_fini(struct pim_interface *pim_ifp) | |
1150 | { | |
1151 | pim_igmp_if_reset(pim_ifp); | |
1152 | ||
18adcff1 SG |
1153 | assert(pim_ifp->gm_group_list); |
1154 | assert(!listcount(pim_ifp->gm_group_list)); | |
dda4d23c | 1155 | |
18adcff1 SG |
1156 | list_delete(&pim_ifp->gm_group_list); |
1157 | hash_free(pim_ifp->gm_group_hash); | |
dda4d23c | 1158 | |
18adcff1 | 1159 | list_delete(&pim_ifp->gm_socket_list); |
dda4d23c DL |
1160 | } |
1161 | ||
c5f76fad SG |
1162 | static struct gm_sock *igmp_sock_new(int fd, struct in_addr ifaddr, |
1163 | struct interface *ifp, int mtrace_only) | |
12e41d03 | 1164 | { |
d62a17ae | 1165 | struct pim_interface *pim_ifp; |
c5f76fad | 1166 | struct gm_sock *igmp; |
d62a17ae | 1167 | |
1168 | pim_ifp = ifp->info; | |
1169 | ||
a96d64b0 | 1170 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 1171 | zlog_debug( |
ee2bbf7c MS |
1172 | "Creating IGMP socket fd=%d for address %pI4 on interface %s", |
1173 | fd, &ifaddr, ifp->name); | |
d62a17ae | 1174 | } |
1175 | ||
1176 | igmp = XCALLOC(MTYPE_PIM_IGMP_SOCKET, sizeof(*igmp)); | |
d62a17ae | 1177 | |
d62a17ae | 1178 | igmp->fd = fd; |
1179 | igmp->interface = ifp; | |
1180 | igmp->ifaddr = ifaddr; | |
9a7cee26 | 1181 | igmp->querier_addr = ifaddr; |
d62a17ae | 1182 | igmp->t_igmp_read = NULL; |
1183 | igmp->t_igmp_query_timer = NULL; | |
1184 | igmp->t_other_querier_timer = NULL; /* no other querier present */ | |
1185 | igmp->querier_robustness_variable = | |
18adcff1 | 1186 | pim_ifp->gm_default_robustness_variable; |
d62a17ae | 1187 | igmp->sock_creation = pim_time_monotonic_sec(); |
1188 | ||
f2058cb4 | 1189 | igmp_stats_init(&igmp->igmp_stats); |
21313cbf | 1190 | |
f83f3966 MS |
1191 | if (mtrace_only) { |
1192 | igmp->mtrace_only = mtrace_only; | |
1193 | return igmp; | |
1194 | } | |
1195 | ||
1196 | igmp->mtrace_only = false; | |
1197 | ||
d62a17ae | 1198 | /* |
1199 | igmp_startup_mode_on() will reset QQI: | |
1200 | ||
18adcff1 | 1201 | igmp->querier_query_interval = pim_ifp->gm_default_query_interval; |
d62a17ae | 1202 | */ |
1203 | igmp_startup_mode_on(igmp); | |
1204 | pim_igmp_general_query_on(igmp); | |
1205 | ||
1206 | return igmp; | |
12e41d03 DL |
1207 | } |
1208 | ||
c5f76fad | 1209 | static void igmp_read_on(struct gm_sock *igmp); |
7923d317 | 1210 | |
cc9f21da | 1211 | static void pim_igmp_read(struct thread *t) |
7923d317 | 1212 | { |
d62a17ae | 1213 | uint8_t buf[10000]; |
c5f76fad | 1214 | struct gm_sock *igmp = (struct gm_sock *)THREAD_ARG(t); |
023d3e4a BG |
1215 | struct sockaddr_storage from; |
1216 | struct sockaddr_storage to; | |
d62a17ae | 1217 | socklen_t fromlen = sizeof(from); |
1218 | socklen_t tolen = sizeof(to); | |
1219 | ifindex_t ifindex = -1; | |
d62a17ae | 1220 | int len; |
1221 | ||
2e1cc436 | 1222 | while (1) { |
d62a17ae | 1223 | len = pim_socket_recvfromto(igmp->fd, buf, sizeof(buf), &from, |
1224 | &fromlen, &to, &tolen, &ifindex); | |
1225 | if (len < 0) { | |
1226 | if (errno == EINTR) | |
1227 | continue; | |
1228 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
1229 | break; | |
1230 | ||
1231 | goto done; | |
1232 | } | |
7923d317 | 1233 | } |
7923d317 | 1234 | |
d62a17ae | 1235 | done: |
1236 | igmp_read_on(igmp); | |
7923d317 DS |
1237 | } |
1238 | ||
c5f76fad | 1239 | static void igmp_read_on(struct gm_sock *igmp) |
7923d317 DS |
1240 | { |
1241 | ||
a96d64b0 | 1242 | if (PIM_DEBUG_GM_TRACE_DETAIL) { |
d62a17ae | 1243 | zlog_debug("Scheduling READ event on IGMP socket fd=%d", |
1244 | igmp->fd); | |
1245 | } | |
36417fcc | 1246 | thread_add_read(router->master, pim_igmp_read, igmp, igmp->fd, |
d62a17ae | 1247 | &igmp->t_igmp_read); |
7923d317 DS |
1248 | } |
1249 | ||
c5f76fad SG |
1250 | struct gm_sock *pim_igmp_sock_add(struct list *igmp_sock_list, |
1251 | struct in_addr ifaddr, struct interface *ifp, | |
1252 | bool mtrace_only) | |
12e41d03 | 1253 | { |
c5f76fad | 1254 | struct gm_sock *igmp; |
d05d3f7a | 1255 | struct sockaddr_in sin; |
d62a17ae | 1256 | int fd; |
12e41d03 | 1257 | |
4f977c8e | 1258 | fd = igmp_sock_open(ifaddr, ifp); |
d62a17ae | 1259 | if (fd < 0) { |
ee2bbf7c MS |
1260 | zlog_warn("Could not open IGMP socket for %pI4 on %s", |
1261 | &ifaddr, ifp->name); | |
d12f46fa | 1262 | return NULL; |
d62a17ae | 1263 | } |
12e41d03 | 1264 | |
d05d3f7a NB |
1265 | sin.sin_family = AF_INET; |
1266 | sin.sin_addr = ifaddr; | |
1267 | sin.sin_port = 0; | |
1268 | if (bind(fd, (struct sockaddr *) &sin, sizeof(sin)) != 0) { | |
262649bd DS |
1269 | zlog_warn("Could not bind IGMP socket for %pI4 on %s: %s(%d)", |
1270 | &ifaddr, ifp->name, strerror(errno), errno); | |
2c85fdd4 DS |
1271 | close(fd); |
1272 | ||
d12f46fa | 1273 | return NULL; |
d05d3f7a NB |
1274 | } |
1275 | ||
f83f3966 | 1276 | igmp = igmp_sock_new(fd, ifaddr, ifp, mtrace_only); |
12e41d03 | 1277 | |
d62a17ae | 1278 | igmp_read_on(igmp); |
7923d317 | 1279 | |
d62a17ae | 1280 | listnode_add(igmp_sock_list, igmp); |
12e41d03 DL |
1281 | |
1282 | #ifdef IGMP_SOCK_DUMP | |
d62a17ae | 1283 | igmp_sock_dump(igmp_sock_array); |
12e41d03 DL |
1284 | #endif |
1285 | ||
d62a17ae | 1286 | return igmp; |
12e41d03 DL |
1287 | } |
1288 | ||
1289 | /* | |
1290 | RFC 3376: 6.5. Switching Router Filter-Modes | |
1291 | ||
1292 | When a router's filter-mode for a group is EXCLUDE and the group | |
1293 | timer expires, the router filter-mode for the group transitions to | |
1294 | INCLUDE. | |
1295 | ||
1296 | A router uses source records with running source timers as its state | |
1297 | for the switch to a filter-mode of INCLUDE. If there are any source | |
1298 | records with source timers greater than zero (i.e., requested to be | |
1299 | forwarded), a router switches to filter-mode of INCLUDE using those | |
1300 | source records. Source records whose timers are zero (from the | |
1301 | previous EXCLUDE mode) are deleted. | |
1302 | */ | |
cc9f21da | 1303 | static void igmp_group_timer(struct thread *t) |
12e41d03 | 1304 | { |
a16db099 | 1305 | struct gm_group *group; |
12e41d03 | 1306 | |
d62a17ae | 1307 | group = THREAD_ARG(t); |
12e41d03 | 1308 | |
a96d64b0 | 1309 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 1310 | char group_str[INET_ADDRSTRLEN]; |
1311 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1312 | sizeof(group_str)); | |
15569c58 | 1313 | zlog_debug("%s: Timer for group %s on interface %s", __func__, |
dda4d23c | 1314 | group_str, group->interface->name); |
d62a17ae | 1315 | } |
12e41d03 | 1316 | |
df5dfb77 | 1317 | assert(group->group_filtermode_isexcl); |
12e41d03 | 1318 | |
d62a17ae | 1319 | group->group_filtermode_isexcl = 0; |
12e41d03 | 1320 | |
d62a17ae | 1321 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ |
1322 | igmp_anysource_forward_stop(group); | |
12e41d03 | 1323 | |
d62a17ae | 1324 | igmp_source_delete_expired(group->group_source_list); |
12e41d03 | 1325 | |
df5dfb77 | 1326 | assert(!group->group_filtermode_isexcl); |
12e41d03 | 1327 | |
d62a17ae | 1328 | /* |
1329 | RFC 3376: 6.2.2. Definition of Group Timers | |
12e41d03 | 1330 | |
d62a17ae | 1331 | If there are no more source records for the group, delete group |
1332 | record. | |
1333 | */ | |
1334 | if (listcount(group->group_source_list) < 1) { | |
1335 | igmp_group_delete_empty_include(group); | |
1336 | } | |
12e41d03 DL |
1337 | } |
1338 | ||
a16db099 | 1339 | static void group_timer_off(struct gm_group *group) |
12e41d03 | 1340 | { |
d62a17ae | 1341 | if (!group->t_group_timer) |
1342 | return; | |
1343 | ||
a96d64b0 | 1344 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 1345 | char group_str[INET_ADDRSTRLEN]; |
1346 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1347 | sizeof(group_str)); | |
1348 | zlog_debug("Cancelling TIMER event for group %s on %s", | |
dda4d23c | 1349 | group_str, group->interface->name); |
d62a17ae | 1350 | } |
1351 | THREAD_OFF(group->t_group_timer); | |
12e41d03 DL |
1352 | } |
1353 | ||
a16db099 | 1354 | void igmp_group_timer_on(struct gm_group *group, long interval_msec, |
d62a17ae | 1355 | const char *ifname) |
12e41d03 | 1356 | { |
d62a17ae | 1357 | group_timer_off(group); |
1358 | ||
95b13dc5 | 1359 | if (PIM_DEBUG_GM_EVENTS) { |
d62a17ae | 1360 | char group_str[INET_ADDRSTRLEN]; |
1361 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1362 | sizeof(group_str)); | |
1363 | zlog_debug( | |
1364 | "Scheduling %ld.%03ld sec TIMER event for group %s on %s", | |
1365 | interval_msec / 1000, interval_msec % 1000, group_str, | |
1366 | ifname); | |
1367 | } | |
1368 | ||
1369 | /* | |
1370 | RFC 3376: 6.2.2. Definition of Group Timers | |
1371 | ||
1372 | The group timer is only used when a group is in EXCLUDE mode and | |
1373 | it represents the time for the *filter-mode* of the group to | |
1374 | expire and switch to INCLUDE mode. | |
1375 | */ | |
df5dfb77 | 1376 | assert(group->group_filtermode_isexcl); |
d62a17ae | 1377 | |
36417fcc DS |
1378 | thread_add_timer_msec(router->master, igmp_group_timer, group, |
1379 | interval_msec, &group->t_group_timer); | |
12e41d03 DL |
1380 | } |
1381 | ||
c5f76fad | 1382 | struct gm_group *find_group_by_addr(struct gm_sock *igmp, |
a16db099 | 1383 | struct in_addr group_addr) |
12e41d03 | 1384 | { |
a16db099 | 1385 | struct gm_group lookup; |
dda4d23c | 1386 | struct pim_interface *pim_ifp = igmp->interface->info; |
12e41d03 | 1387 | |
d62a17ae | 1388 | lookup.group_addr.s_addr = group_addr.s_addr; |
12e41d03 | 1389 | |
18adcff1 | 1390 | return hash_lookup(pim_ifp->gm_group_hash, &lookup); |
12e41d03 DL |
1391 | } |
1392 | ||
c5f76fad | 1393 | struct gm_group *igmp_add_group_by_addr(struct gm_sock *igmp, |
a16db099 | 1394 | struct in_addr group_addr) |
12e41d03 | 1395 | { |
a16db099 | 1396 | struct gm_group *group; |
dda4d23c | 1397 | struct pim_interface *pim_ifp = igmp->interface->info; |
d62a17ae | 1398 | |
1399 | group = find_group_by_addr(igmp, group_addr); | |
1400 | if (group) { | |
1401 | return group; | |
1402 | } | |
1403 | ||
1404 | if (!pim_is_group_224_4(group_addr)) { | |
1405 | zlog_warn("%s: Group Specified is not part of 224.0.0.0/4", | |
15569c58 | 1406 | __func__); |
d62a17ae | 1407 | return NULL; |
1408 | } | |
1409 | ||
1410 | if (pim_is_group_224_0_0_0_24(group_addr)) { | |
a96d64b0 | 1411 | if (PIM_DEBUG_GM_TRACE) |
6b5122a0 | 1412 | zlog_debug( |
ee2bbf7c MS |
1413 | "%s: Group specified %pI4 is part of 224.0.0.0/24", |
1414 | __func__, &group_addr); | |
d62a17ae | 1415 | return NULL; |
1416 | } | |
1417 | /* | |
1418 | Non-existant group is created as INCLUDE {empty}: | |
1419 | ||
1420 | RFC 3376 - 5.1. Action on Change of Interface State | |
1421 | ||
1422 | If no interface state existed for that multicast address before | |
1423 | the change (i.e., the change consisted of creating a new | |
1424 | per-interface record), or if no state exists after the change | |
1425 | (i.e., the change consisted of deleting a per-interface record), | |
1426 | then the "non-existent" state is considered to have a filter mode | |
1427 | of INCLUDE and an empty source list. | |
1428 | */ | |
1429 | ||
1430 | group = XCALLOC(MTYPE_PIM_IGMP_GROUP, sizeof(*group)); | |
d62a17ae | 1431 | |
1432 | group->group_source_list = list_new(); | |
d62a17ae | 1433 | group->group_source_list->del = (void (*)(void *))igmp_source_free; |
1434 | ||
1435 | group->t_group_timer = NULL; | |
1436 | group->t_group_query_retransmit_timer = NULL; | |
1437 | group->group_specific_query_retransmit_count = 0; | |
1438 | group->group_addr = group_addr; | |
dda4d23c | 1439 | group->interface = igmp->interface; |
d62a17ae | 1440 | group->last_igmp_v1_report_dsec = -1; |
1441 | group->last_igmp_v2_report_dsec = -1; | |
1442 | group->group_creation = pim_time_monotonic_sec(); | |
1443 | group->igmp_version = IGMP_DEFAULT_VERSION; | |
1444 | ||
1445 | /* initialize new group as INCLUDE {empty} */ | |
1446 | group->group_filtermode_isexcl = 0; /* 0=INCLUDE, 1=EXCLUDE */ | |
1447 | ||
18adcff1 SG |
1448 | listnode_add(pim_ifp->gm_group_list, group); |
1449 | group = hash_get(pim_ifp->gm_group_hash, group, hash_alloc_intern); | |
d62a17ae | 1450 | |
a96d64b0 | 1451 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 1452 | char group_str[INET_ADDRSTRLEN]; |
1453 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1454 | sizeof(group_str)); | |
1455 | zlog_debug( | |
1456 | "Creating new IGMP group %s on socket %d interface %s", | |
1457 | group_str, igmp->fd, igmp->interface->name); | |
1458 | } | |
1459 | ||
dda4d23c | 1460 | igmp_group_count_incr(pim_ifp); |
339f7695 | 1461 | |
d62a17ae | 1462 | /* |
1463 | RFC 3376: 6.2.2. Definition of Group Timers | |
1464 | ||
1465 | The group timer is only used when a group is in EXCLUDE mode and | |
1466 | it represents the time for the *filter-mode* of the group to | |
1467 | expire and switch to INCLUDE mode. | |
1468 | */ | |
df5dfb77 DL |
1469 | assert(!group->group_filtermode_isexcl); /* INCLUDE mode */ |
1470 | assert(!group->t_group_timer); /* group timer == 0 */ | |
d62a17ae | 1471 | |
1472 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
1473 | igmp_anysource_forward_stop(group); | |
1474 | ||
1475 | return group; | |
12e41d03 | 1476 | } |
b05b72e8 | 1477 | |
278912ea DA |
1478 | void igmp_send_query(int igmp_version, struct gm_group *group, char *query_buf, |
1479 | int query_buf_size, int num_sources, | |
1480 | struct in_addr dst_addr, struct in_addr group_addr, | |
d62a17ae | 1481 | int query_max_response_time_dsec, uint8_t s_flag, |
278912ea | 1482 | struct gm_sock *igmp) |
b05b72e8 | 1483 | { |
278912ea DA |
1484 | if (pim_addr_is_any(group_addr) && |
1485 | ntohl(dst_addr.s_addr) == INADDR_ALLHOSTS_GROUP) | |
1486 | igmp->igmp_stats.general_queries_sent++; | |
1487 | else if (group) | |
1488 | igmp->igmp_stats.group_queries_sent++; | |
1489 | ||
d62a17ae | 1490 | if (igmp_version == 3) { |
278912ea DA |
1491 | igmp_v3_send_query(group, igmp->fd, igmp->interface->name, |
1492 | query_buf, query_buf_size, num_sources, | |
1493 | dst_addr, group_addr, | |
d62a17ae | 1494 | query_max_response_time_dsec, s_flag, |
278912ea DA |
1495 | igmp->querier_robustness_variable, |
1496 | igmp->querier_query_interval); | |
d62a17ae | 1497 | } else if (igmp_version == 2) { |
278912ea DA |
1498 | igmp_v2_send_query(group, igmp->fd, igmp->interface->name, |
1499 | query_buf, dst_addr, group_addr, | |
1500 | query_max_response_time_dsec); | |
d62a17ae | 1501 | } |
b05b72e8 | 1502 | } |
6741a5bb | 1503 | |
1504 | void igmp_send_query_on_intf(struct interface *ifp, int igmp_ver) | |
1505 | { | |
1506 | struct pim_interface *pim_ifp = ifp->info; | |
1507 | struct listnode *sock_node = NULL; | |
c5f76fad | 1508 | struct gm_sock *igmp = NULL; |
6741a5bb | 1509 | struct in_addr dst_addr; |
1510 | struct in_addr group_addr; | |
1511 | int query_buf_size; | |
1512 | ||
1513 | if (!igmp_ver) | |
1514 | igmp_ver = 2; | |
1515 | ||
1516 | if (igmp_ver == 3) | |
1517 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; | |
1518 | else | |
1519 | query_buf_size = IGMP_V12_MSG_SIZE; | |
1520 | ||
1521 | dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); | |
1522 | group_addr.s_addr = PIM_NET_INADDR_ANY; | |
1523 | ||
a96d64b0 | 1524 | if (PIM_DEBUG_GM_TRACE) |
18adcff1 | 1525 | zlog_debug("Issuing general query on request on %s", ifp->name); |
6741a5bb | 1526 | |
18adcff1 | 1527 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->gm_socket_list, sock_node, igmp)) { |
6741a5bb | 1528 | |
1529 | char query_buf[query_buf_size]; | |
1530 | ||
278912ea DA |
1531 | igmp_send_query( |
1532 | igmp_ver, 0 /* igmp_group */, query_buf, | |
1533 | sizeof(query_buf), 0 /* num_sources */, dst_addr, | |
1534 | group_addr, pim_ifp->gm_query_max_response_time_dsec, | |
1535 | 1 /* s_flag: always set for general queries */, igmp); | |
6741a5bb | 1536 | } |
1537 | } |