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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" | |
993e3d8e | 30 | #include "pim_instance.h" |
12e41d03 | 31 | #include "pim_igmp.h" |
b05b72e8 | 32 | #include "pim_igmpv2.h" |
12e41d03 | 33 | #include "pim_igmpv3.h" |
4d9ad5dc | 34 | #include "pim_igmp_mtrace.h" |
12e41d03 DL |
35 | #include "pim_iface.h" |
36 | #include "pim_sock.h" | |
37 | #include "pim_mroute.h" | |
38 | #include "pim_str.h" | |
39 | #include "pim_util.h" | |
40 | #include "pim_time.h" | |
cd6d2858 DL |
41 | #include "pim_ssm.h" |
42 | #include "pim_tib.h" | |
12e41d03 | 43 | |
a16db099 | 44 | static void group_timer_off(struct gm_group *group); |
cc9f21da | 45 | static void pim_igmp_general_query(struct thread *t); |
12e41d03 | 46 | |
cd6d2858 DL |
47 | void igmp_anysource_forward_start(struct pim_instance *pim, |
48 | struct gm_group *group) | |
49 | { | |
50 | struct gm_source *source; | |
51 | struct in_addr src_addr = {.s_addr = 0}; | |
52 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
53 | assert(group->group_filtermode_isexcl); | |
54 | assert(listcount(group->group_source_list) < 1); | |
55 | ||
56 | source = igmp_get_source_by_addr(group, src_addr, NULL); | |
57 | if (!source) { | |
58 | zlog_warn("%s: Failure to create * source", __func__); | |
59 | return; | |
60 | } | |
61 | ||
62 | igmp_source_forward_start(pim, source); | |
63 | } | |
64 | ||
65 | void igmp_anysource_forward_stop(struct gm_group *group) | |
66 | { | |
67 | struct gm_source *source; | |
68 | struct in_addr star = {.s_addr = 0}; | |
69 | ||
70 | source = igmp_find_source_by_addr(group, star); | |
71 | if (source) | |
72 | igmp_source_forward_stop(source); | |
73 | } | |
74 | ||
75 | static void igmp_source_forward_reevaluate_one(struct pim_instance *pim, | |
261b019f MR |
76 | struct gm_source *source, |
77 | int is_grp_ssm) | |
cd6d2858 DL |
78 | { |
79 | pim_sgaddr sg; | |
80 | struct gm_group *group = source->source_group; | |
cd6d2858 DL |
81 | |
82 | memset(&sg, 0, sizeof(sg)); | |
83 | sg.src = source->source_addr; | |
84 | sg.grp = group->group_addr; | |
85 | ||
261b019f MR |
86 | /** if there is no PIM state **/ |
87 | if (IGMP_SOURCE_TEST_FORWARDING(source->source_flags)) { | |
88 | if (pim_addr_is_any(source->source_addr)) { | |
89 | if (is_grp_ssm) { | |
90 | if (PIM_DEBUG_PIM_EVENTS) | |
91 | zlog_debug( | |
92 | "local membership del for %pSG as G is now SSM", | |
93 | &sg); | |
94 | igmp_source_forward_stop(source); | |
95 | } | |
96 | } else { | |
97 | if (!is_grp_ssm) { | |
98 | if (PIM_DEBUG_PIM_EVENTS) | |
99 | zlog_debug( | |
100 | "local membership del for %pSG as G is now ASM", | |
101 | &sg); | |
102 | igmp_source_forward_stop(source); | |
103 | } | |
cd6d2858 DL |
104 | } |
105 | } else { | |
261b019f | 106 | if (!pim_addr_is_any(source->source_addr) && (is_grp_ssm)) { |
cd6d2858 DL |
107 | if (PIM_DEBUG_PIM_EVENTS) |
108 | zlog_debug( | |
261b019f | 109 | "local membership add for %pSG as G is now SSM", |
cd6d2858 | 110 | &sg); |
261b019f | 111 | igmp_source_forward_start(pim, source); |
cd6d2858 DL |
112 | } |
113 | } | |
114 | } | |
115 | ||
116 | void igmp_source_forward_reevaluate_all(struct pim_instance *pim) | |
117 | { | |
118 | struct interface *ifp; | |
119 | ||
120 | FOR_ALL_INTERFACES (pim->vrf, ifp) { | |
121 | struct pim_interface *pim_ifp = ifp->info; | |
5c13cb9d | 122 | struct listnode *grpnode, *grp_nextnode; |
cd6d2858 DL |
123 | struct gm_group *grp; |
124 | struct pim_ifchannel *ch, *ch_temp; | |
125 | ||
126 | if (!pim_ifp) | |
127 | continue; | |
128 | ||
129 | /* scan igmp groups */ | |
5c13cb9d DA |
130 | for (ALL_LIST_ELEMENTS(pim_ifp->gm_group_list, grpnode, |
131 | grp_nextnode, grp)) { | |
cd6d2858 DL |
132 | struct listnode *srcnode; |
133 | struct gm_source *src; | |
261b019f | 134 | int is_grp_ssm; |
cd6d2858 | 135 | |
6d0a6ede MR |
136 | /* |
137 | * RFC 4604 | |
138 | * section 2.2.1 | |
139 | * EXCLUDE mode does not apply to SSM addresses, | |
140 | * and an SSM-aware router will ignore | |
141 | * MODE_IS_EXCLUDE and CHANGE_TO_EXCLUDE_MODE | |
142 | * requests in the SSM range. | |
143 | */ | |
261b019f MR |
144 | is_grp_ssm = pim_is_grp_ssm(pim, grp->group_addr); |
145 | if (is_grp_ssm && grp->group_filtermode_isexcl) { | |
6d0a6ede MR |
146 | igmp_group_delete(grp); |
147 | } else { | |
148 | /* scan group sources */ | |
149 | for (ALL_LIST_ELEMENTS_RO( | |
150 | grp->group_source_list, srcnode, | |
151 | src)) { | |
261b019f MR |
152 | igmp_source_forward_reevaluate_one( |
153 | pim, src, is_grp_ssm); | |
6d0a6ede MR |
154 | } /* scan group sources */ |
155 | } | |
156 | } /* scan igmp groups */ | |
cd6d2858 DL |
157 | |
158 | RB_FOREACH_SAFE (ch, pim_ifchannel_rb, &pim_ifp->ifchannel_rb, | |
159 | ch_temp) { | |
160 | if (pim_is_grp_ssm(pim, ch->sg.grp)) { | |
161 | if (pim_addr_is_any(ch->sg.src)) | |
162 | pim_ifchannel_delete(ch); | |
163 | } | |
164 | } | |
165 | } /* scan interfaces */ | |
166 | } | |
167 | ||
168 | void igmp_source_forward_start(struct pim_instance *pim, | |
169 | struct gm_source *source) | |
170 | { | |
171 | struct gm_group *group; | |
172 | pim_sgaddr sg; | |
173 | ||
174 | memset(&sg, 0, sizeof(sg)); | |
175 | sg.src = source->source_addr; | |
176 | sg.grp = source->source_group->group_addr; | |
177 | ||
a96d64b0 | 178 | if (PIM_DEBUG_GM_TRACE) { |
cd6d2858 DL |
179 | zlog_debug("%s: (S,G)=%pSG oif=%s fwd=%d", __func__, &sg, |
180 | source->source_group->interface->name, | |
181 | IGMP_SOURCE_TEST_FORWARDING(source->source_flags)); | |
182 | } | |
183 | ||
037a2c2e MR |
184 | /* |
185 | * PIM state should not be allowed for ASM group with valid source | |
186 | * address. | |
187 | */ | |
188 | if ((!pim_is_grp_ssm(pim, source->source_group->group_addr)) && | |
189 | !pim_addr_is_any(source->source_addr)) { | |
190 | zlog_warn( | |
191 | "%s: (S,G)=%pSG ASM range having source address, not allowed to create PIM state", | |
192 | __func__, &sg); | |
193 | return; | |
194 | } | |
195 | ||
cd6d2858 DL |
196 | /* Prevent IGMP interface from installing multicast route multiple |
197 | times */ | |
198 | if (IGMP_SOURCE_TEST_FORWARDING(source->source_flags)) { | |
199 | return; | |
200 | } | |
201 | ||
202 | group = source->source_group; | |
203 | ||
204 | if (tib_sg_gm_join(pim, sg, group->interface, | |
205 | &source->source_channel_oil)) | |
206 | IGMP_SOURCE_DO_FORWARDING(source->source_flags); | |
207 | } | |
208 | ||
209 | /* | |
07b12758 DS |
210 | igmp_source_forward_stop: stop forwarding, but keep the source |
211 | igmp_source_delete: stop forwarding, and delete the source | |
cd6d2858 DL |
212 | */ |
213 | void igmp_source_forward_stop(struct gm_source *source) | |
214 | { | |
215 | struct pim_interface *pim_oif; | |
216 | struct gm_group *group; | |
217 | pim_sgaddr sg; | |
218 | ||
219 | memset(&sg, 0, sizeof(sg)); | |
220 | sg.src = source->source_addr; | |
221 | sg.grp = source->source_group->group_addr; | |
222 | ||
a96d64b0 | 223 | if (PIM_DEBUG_GM_TRACE) { |
cd6d2858 DL |
224 | zlog_debug("%s: (S,G)=%pSG oif=%s fwd=%d", __func__, &sg, |
225 | source->source_group->interface->name, | |
226 | IGMP_SOURCE_TEST_FORWARDING(source->source_flags)); | |
227 | } | |
228 | ||
229 | /* Prevent IGMP interface from removing multicast route multiple | |
230 | times */ | |
231 | if (!IGMP_SOURCE_TEST_FORWARDING(source->source_flags)) { | |
232 | return; | |
233 | } | |
234 | ||
235 | group = source->source_group; | |
236 | pim_oif = group->interface->info; | |
237 | ||
238 | tib_sg_gm_prune(pim_oif->pim, sg, group->interface, | |
239 | &source->source_channel_oil); | |
240 | IGMP_SOURCE_DONT_FORWARDING(source->source_flags); | |
241 | } | |
242 | ||
b05b72e8 DW |
243 | /* This socket is used for TXing IGMP packets only, IGMP RX happens |
244 | * in pim_mroute_msg() | |
245 | */ | |
4f977c8e | 246 | static int igmp_sock_open(struct in_addr ifaddr, struct interface *ifp) |
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 | |
a96d64b0 | 349 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 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 | ||
a96d64b0 | 385 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 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 | |
a96d64b0 | 426 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 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 | |
a96d64b0 | 445 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 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 | 503 | if (!pim_if_connected_to_source(ifp, from)) { |
55eb347d | 504 | if (PIM_DEBUG_GM_PACKETS) |
8890b440 DS |
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)) { |
55eb347d | 511 | if (PIM_DEBUG_GM_PACKETS) |
26a0f1e2 DS |
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 | ||
55eb347d | 557 | if (PIM_DEBUG_GM_PACKETS) { |
d62a17ae | 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 | */ | |
8d9e46a7 MR |
588 | const struct gm_group *group; |
589 | const struct listnode *grpnode; | |
590 | ||
591 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->gm_group_list, grpnode, | |
592 | group)) { | |
593 | if (!group->t_group_query_retransmit_timer) | |
594 | continue; | |
5bc4a46b | 595 | |
a96d64b0 | 596 | if (PIM_DEBUG_GM_TRACE) |
5bc4a46b MR |
597 | zlog_debug( |
598 | "%s: lower address query packet from %s is ignored when last member query interval timer is running", | |
599 | ifp->name, from_str); | |
600 | return 0; | |
601 | } | |
602 | ||
a96d64b0 | 603 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 604 | char ifaddr_str[INET_ADDRSTRLEN]; |
605 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
606 | sizeof(ifaddr_str)); | |
607 | zlog_debug( | |
608 | "%s: local address %s (%u) lost querier election to %s (%u)", | |
609 | ifp->name, ifaddr_str, | |
610 | ntohl(igmp->ifaddr.s_addr), from_str, | |
611 | ntohl(from.s_addr)); | |
612 | } | |
a0625bb3 MR |
613 | /* Reset the other querier timer only if query is received from |
614 | * the previously elected querier or a better new querier | |
615 | * This will make sure that non-querier elects the new querier | |
616 | * whose ip address is higher than the old querier | |
617 | * in case the old querier goes down via other querier present | |
618 | * timer expiry | |
619 | */ | |
620 | if (ntohl(from.s_addr) <= ntohl(igmp->querier_addr.s_addr)) { | |
9a7cee26 | 621 | igmp->querier_addr.s_addr = from.s_addr; |
a0625bb3 MR |
622 | pim_igmp_other_querier_timer_on(igmp); |
623 | } | |
d62a17ae | 624 | } |
625 | ||
626 | /* IGMP version 3 is the only one where we process the RXed query */ | |
627 | if (query_version == 3) { | |
628 | igmp_v3_recv_query(igmp, from_str, igmp_msg); | |
629 | } | |
630 | ||
631 | return 0; | |
12e41d03 DL |
632 | } |
633 | ||
d62a17ae | 634 | static void on_trace(const char *label, struct interface *ifp, |
635 | struct in_addr from) | |
12e41d03 | 636 | { |
a96d64b0 | 637 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 638 | char from_str[INET_ADDRSTRLEN]; |
639 | pim_inet4_dump("<from?>", from, from_str, sizeof(from_str)); | |
640 | zlog_debug("%s: from %s on %s", label, from_str, ifp->name); | |
641 | } | |
12e41d03 DL |
642 | } |
643 | ||
c5f76fad | 644 | static int igmp_v1_recv_report(struct gm_sock *igmp, struct in_addr from, |
d62a17ae | 645 | const char *from_str, char *igmp_msg, |
646 | int igmp_msg_len) | |
12e41d03 | 647 | { |
d62a17ae | 648 | struct interface *ifp = igmp->interface; |
a16db099 | 649 | struct gm_group *group; |
d62a17ae | 650 | struct in_addr group_addr; |
12e41d03 | 651 | |
15569c58 | 652 | on_trace(__func__, igmp->interface, from); |
12e41d03 | 653 | |
f83f3966 MS |
654 | if (igmp->mtrace_only) |
655 | return 0; | |
656 | ||
d62a17ae | 657 | if (igmp_msg_len != IGMP_V12_MSG_SIZE) { |
658 | zlog_warn( | |
659 | "Recv IGMP report v1 from %s on %s: size=%d other than correct=%d", | |
660 | from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE); | |
661 | return -1; | |
662 | } | |
12e41d03 | 663 | |
9041c30a MR |
664 | if (igmp_validate_checksum(igmp_msg, igmp_msg_len) == -1) { |
665 | zlog_warn( | |
666 | "Recv IGMP report v1 from %s on %s with invalid checksum", | |
667 | from_str, ifp->name); | |
668 | return -1; | |
669 | } | |
670 | ||
21313cbf | 671 | /* Collecting IGMP Rx stats */ |
f2058cb4 | 672 | igmp->igmp_stats.report_v1++; |
21313cbf | 673 | |
a96d64b0 | 674 | if (PIM_DEBUG_GM_TRACE) { |
15569c58 | 675 | zlog_warn("%s %s: FIXME WRITEME", __FILE__, __func__); |
d62a17ae | 676 | } |
12e41d03 | 677 | |
d62a17ae | 678 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
12e41d03 | 679 | |
b0f525a8 QY |
680 | if (pim_is_group_filtered(ifp->info, &group_addr)) |
681 | return -1; | |
682 | ||
b97047ed | 683 | /* non-existent group is created as INCLUDE {empty} */ |
d62a17ae | 684 | group = igmp_add_group_by_addr(igmp, group_addr); |
685 | if (!group) { | |
686 | return -1; | |
687 | } | |
12e41d03 | 688 | |
d62a17ae | 689 | group->last_igmp_v1_report_dsec = pim_time_monotonic_dsec(); |
12e41d03 | 690 | |
d62a17ae | 691 | return 0; |
12e41d03 DL |
692 | } |
693 | ||
88ea79ad | 694 | bool pim_igmp_verify_header(struct ip *ip_hdr, size_t len, size_t *hlen) |
ff4ad870 | 695 | { |
88ea79ad MR |
696 | char *igmp_msg; |
697 | int igmp_msg_len; | |
698 | int msg_type; | |
699 | size_t ip_hlen; /* ip header length in bytes */ | |
700 | ||
ff4ad870 MR |
701 | if (len < sizeof(*ip_hdr)) { |
702 | zlog_warn("IGMP packet size=%zu shorter than minimum=%zu", len, | |
703 | sizeof(*ip_hdr)); | |
704 | return false; | |
705 | } | |
706 | ||
88ea79ad MR |
707 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ |
708 | *hlen = ip_hlen; | |
709 | ||
710 | if (ip_hlen > len) { | |
711 | zlog_warn( | |
712 | "IGMP packet header claims size %zu, but we only have %zu bytes", | |
713 | ip_hlen, len); | |
714 | return false; | |
715 | } | |
716 | ||
717 | igmp_msg = (char *)ip_hdr + ip_hlen; | |
718 | igmp_msg_len = len - ip_hlen; | |
719 | msg_type = *igmp_msg; | |
720 | ||
ff4ad870 MR |
721 | if (igmp_msg_len < PIM_IGMP_MIN_LEN) { |
722 | zlog_warn("IGMP message size=%d shorter than minimum=%d", | |
723 | igmp_msg_len, PIM_IGMP_MIN_LEN); | |
724 | return false; | |
725 | } | |
726 | ||
54d7bf0c MR |
727 | if ((msg_type != PIM_IGMP_MTRACE_RESPONSE) |
728 | && (msg_type != PIM_IGMP_MTRACE_QUERY_REQUEST)) { | |
729 | if (ip_hdr->ip_ttl != 1) { | |
730 | zlog_warn( | |
731 | "Recv IGMP packet with invalid ttl=%u, discarding the packet", | |
732 | ip_hdr->ip_ttl); | |
e748f180 | 733 | return false; |
54d7bf0c MR |
734 | } |
735 | } | |
736 | ||
ff4ad870 MR |
737 | return true; |
738 | } | |
739 | ||
c5f76fad | 740 | int pim_igmp_packet(struct gm_sock *igmp, char *buf, size_t len) |
12e41d03 | 741 | { |
88ea79ad | 742 | struct ip *ip_hdr = (struct ip *)buf; |
d62a17ae | 743 | size_t ip_hlen; /* ip header length in bytes */ |
744 | char *igmp_msg; | |
745 | int igmp_msg_len; | |
746 | int msg_type; | |
747 | char from_str[INET_ADDRSTRLEN]; | |
748 | char to_str[INET_ADDRSTRLEN]; | |
749 | ||
88ea79ad | 750 | if (!pim_igmp_verify_header(ip_hdr, len, &ip_hlen)) |
f08e6750 | 751 | return -1; |
f08e6750 | 752 | |
d62a17ae | 753 | igmp_msg = buf + ip_hlen; |
d62a17ae | 754 | igmp_msg_len = len - ip_hlen; |
f08e6750 QY |
755 | msg_type = *igmp_msg; |
756 | ||
ff4ad870 MR |
757 | pim_inet4_dump("<src?>", ip_hdr->ip_src, from_str, sizeof(from_str)); |
758 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, to_str, sizeof(to_str)); | |
759 | ||
55eb347d | 760 | if (PIM_DEBUG_GM_PACKETS) { |
d62a17ae | 761 | zlog_debug( |
c7e663d6 DS |
762 | "Recv IGMP packet from %s to %s on %s: size=%zu ttl=%d msg_type=%d msg_size=%d", |
763 | from_str, to_str, igmp->interface->name, len, ip_hdr->ip_ttl, | |
d62a17ae | 764 | msg_type, igmp_msg_len); |
765 | } | |
12e41d03 | 766 | |
d62a17ae | 767 | switch (msg_type) { |
768 | case PIM_IGMP_MEMBERSHIP_QUERY: { | |
769 | int max_resp_code = igmp_msg[1]; | |
770 | int query_version; | |
771 | ||
772 | /* | |
773 | RFC 3376: 7.1. Query Version Distinctions | |
774 | IGMPv1 Query: length = 8 octets AND Max Resp Code field is | |
775 | zero | |
776 | IGMPv2 Query: length = 8 octets AND Max Resp Code field is | |
777 | non-zero | |
778 | IGMPv3 Query: length >= 12 octets | |
779 | */ | |
780 | ||
781 | if (igmp_msg_len == 8) { | |
782 | query_version = max_resp_code ? 2 : 1; | |
783 | } else if (igmp_msg_len >= 12) { | |
784 | query_version = 3; | |
785 | } else { | |
786 | zlog_warn("Unknown IGMP query version"); | |
787 | return -1; | |
788 | } | |
789 | ||
790 | return igmp_recv_query(igmp, query_version, max_resp_code, | |
791 | ip_hdr->ip_src, from_str, igmp_msg, | |
792 | igmp_msg_len); | |
793 | } | |
12e41d03 | 794 | |
d62a17ae | 795 | case PIM_IGMP_V3_MEMBERSHIP_REPORT: |
796 | return igmp_v3_recv_report(igmp, ip_hdr->ip_src, from_str, | |
797 | igmp_msg, igmp_msg_len); | |
12e41d03 | 798 | |
d62a17ae | 799 | case PIM_IGMP_V2_MEMBERSHIP_REPORT: |
800 | return igmp_v2_recv_report(igmp, ip_hdr->ip_src, from_str, | |
801 | igmp_msg, igmp_msg_len); | |
12e41d03 | 802 | |
d62a17ae | 803 | case PIM_IGMP_V1_MEMBERSHIP_REPORT: |
804 | return igmp_v1_recv_report(igmp, ip_hdr->ip_src, from_str, | |
805 | igmp_msg, igmp_msg_len); | |
12e41d03 | 806 | |
d62a17ae | 807 | case PIM_IGMP_V2_LEAVE_GROUP: |
d1b61cb9 MR |
808 | return igmp_v2_recv_leave(igmp, ip_hdr, from_str, igmp_msg, |
809 | igmp_msg_len); | |
4d9ad5dc MS |
810 | |
811 | case PIM_IGMP_MTRACE_RESPONSE: | |
812 | return igmp_mtrace_recv_response(igmp, ip_hdr, ip_hdr->ip_src, | |
813 | from_str, igmp_msg, | |
814 | igmp_msg_len); | |
4d9ad5dc MS |
815 | case PIM_IGMP_MTRACE_QUERY_REQUEST: |
816 | return igmp_mtrace_recv_qry_req(igmp, ip_hdr, ip_hdr->ip_src, | |
817 | from_str, igmp_msg, | |
818 | igmp_msg_len); | |
d62a17ae | 819 | } |
12e41d03 | 820 | |
d62a17ae | 821 | zlog_warn("Ignoring unsupported IGMP message type: %d", msg_type); |
822 | ||
21313cbf | 823 | /* Collecting IGMP Rx stats */ |
f2058cb4 | 824 | igmp->igmp_stats.unsupported++; |
21313cbf | 825 | |
d62a17ae | 826 | return -1; |
12e41d03 DL |
827 | } |
828 | ||
c5f76fad | 829 | void pim_igmp_general_query_on(struct gm_sock *igmp) |
12e41d03 | 830 | { |
d62a17ae | 831 | struct pim_interface *pim_ifp; |
832 | int startup_mode; | |
833 | int query_interval; | |
834 | ||
835 | /* | |
836 | Since this socket is starting as querier, | |
837 | there should not exist a timer for other-querier-present. | |
838 | */ | |
df5dfb77 | 839 | assert(!igmp->t_other_querier_timer); |
d62a17ae | 840 | pim_ifp = igmp->interface->info; |
df5dfb77 | 841 | assert(pim_ifp); |
d62a17ae | 842 | |
843 | /* | |
844 | RFC 3376: 8.6. Startup Query Interval | |
845 | ||
846 | The Startup Query Interval is the interval between General Queries | |
847 | sent by a Querier on startup. Default: 1/4 the Query Interval. | |
848 | The first one should be sent out immediately instead of 125/4 | |
849 | seconds from now. | |
850 | */ | |
851 | startup_mode = igmp->startup_query_count > 0; | |
852 | if (startup_mode) { | |
853 | /* | |
854 | * If this is the first time we are sending a query on a | |
855 | * newly configured igmp interface send it out in 1 second | |
856 | * just to give the entire world a tiny bit of time to settle | |
857 | * else the query interval is: | |
18adcff1 | 858 | * query_interval = pim_ifp->gm_default_query_interval >> 2; |
d62a17ae | 859 | */ |
18adcff1 SG |
860 | if (igmp->startup_query_count == |
861 | igmp->querier_robustness_variable) | |
d62a17ae | 862 | query_interval = 1; |
863 | else | |
29e58225 | 864 | query_interval = PIM_IGMP_SQI( |
18adcff1 | 865 | pim_ifp->gm_default_query_interval); |
d62a17ae | 866 | |
867 | --igmp->startup_query_count; | |
868 | } else { | |
869 | query_interval = igmp->querier_query_interval; | |
870 | } | |
871 | ||
a96d64b0 | 872 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 873 | char ifaddr_str[INET_ADDRSTRLEN]; |
874 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
875 | sizeof(ifaddr_str)); | |
876 | zlog_debug( | |
877 | "Querier %s scheduling %d-second (%s) TIMER event for IGMP query on fd=%d", | |
878 | ifaddr_str, query_interval, | |
879 | startup_mode ? "startup" : "non-startup", igmp->fd); | |
880 | } | |
36417fcc DS |
881 | thread_add_timer(router->master, pim_igmp_general_query, igmp, |
882 | query_interval, &igmp->t_igmp_query_timer); | |
12e41d03 DL |
883 | } |
884 | ||
c5f76fad | 885 | void pim_igmp_general_query_off(struct gm_sock *igmp) |
12e41d03 | 886 | { |
df5dfb77 | 887 | assert(igmp); |
d62a17ae | 888 | |
a96d64b0 | 889 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 890 | if (igmp->t_igmp_query_timer) { |
891 | char ifaddr_str[INET_ADDRSTRLEN]; | |
892 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
893 | sizeof(ifaddr_str)); | |
894 | zlog_debug( | |
895 | "IGMP querier %s fd=%d cancelling query TIMER event on %s", | |
896 | ifaddr_str, igmp->fd, igmp->interface->name); | |
897 | } | |
898 | } | |
899 | THREAD_OFF(igmp->t_igmp_query_timer); | |
12e41d03 DL |
900 | } |
901 | ||
902 | /* Issue IGMP general query */ | |
cc9f21da | 903 | static void pim_igmp_general_query(struct thread *t) |
12e41d03 | 904 | { |
c5f76fad | 905 | struct gm_sock *igmp; |
d62a17ae | 906 | struct in_addr dst_addr; |
907 | struct in_addr group_addr; | |
908 | struct pim_interface *pim_ifp; | |
909 | int query_buf_size; | |
910 | ||
911 | igmp = THREAD_ARG(t); | |
912 | ||
df5dfb77 DL |
913 | assert(igmp->interface); |
914 | assert(igmp->interface->info); | |
d62a17ae | 915 | |
916 | pim_ifp = igmp->interface->info; | |
917 | ||
29e58225 | 918 | if (pim_ifp->igmp_version == 3) { |
d62a17ae | 919 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; |
920 | } else { | |
921 | query_buf_size = IGMP_V12_MSG_SIZE; | |
922 | } | |
923 | ||
924 | char query_buf[query_buf_size]; | |
925 | ||
926 | /* | |
927 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
928 | ||
929 | In IGMPv3, General Queries are sent with an IP destination address | |
930 | of 224.0.0.1, the all-systems multicast address. Group-Specific | |
931 | and Group-and-Source-Specific Queries are sent with an IP | |
932 | destination address equal to the multicast address of interest. | |
933 | */ | |
934 | ||
935 | dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); | |
936 | group_addr.s_addr = PIM_NET_INADDR_ANY; | |
937 | ||
a96d64b0 | 938 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 939 | char querier_str[INET_ADDRSTRLEN]; |
940 | char dst_str[INET_ADDRSTRLEN]; | |
941 | pim_inet4_dump("<querier?>", igmp->ifaddr, querier_str, | |
942 | sizeof(querier_str)); | |
943 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
944 | zlog_debug("Querier %s issuing IGMP general query to %s on %s", | |
945 | querier_str, dst_str, igmp->interface->name); | |
946 | } | |
947 | ||
278912ea DA |
948 | igmp_send_query(pim_ifp->igmp_version, 0 /* igmp_group */, query_buf, |
949 | sizeof(query_buf), 0 /* num_sources */, dst_addr, | |
950 | group_addr, pim_ifp->gm_query_max_response_time_dsec, | |
951 | 1 /* s_flag: always set for general queries */, igmp); | |
d62a17ae | 952 | |
953 | pim_igmp_general_query_on(igmp); | |
12e41d03 DL |
954 | } |
955 | ||
c5f76fad | 956 | static void sock_close(struct gm_sock *igmp) |
12e41d03 | 957 | { |
d62a17ae | 958 | pim_igmp_other_querier_timer_off(igmp); |
959 | pim_igmp_general_query_off(igmp); | |
960 | ||
a96d64b0 | 961 | if (PIM_DEBUG_GM_TRACE_DETAIL) { |
d62a17ae | 962 | if (igmp->t_igmp_read) { |
963 | zlog_debug( | |
ee2bbf7c MS |
964 | "Cancelling READ event on IGMP socket %pI4 fd=%d on interface %s", |
965 | &igmp->ifaddr, igmp->fd, | |
d62a17ae | 966 | igmp->interface->name); |
967 | } | |
968 | } | |
969 | THREAD_OFF(igmp->t_igmp_read); | |
970 | ||
971 | if (close(igmp->fd)) { | |
af4c2728 | 972 | flog_err( |
450971aa | 973 | EC_LIB_SOCKET, |
ee2bbf7c MS |
974 | "Failure closing IGMP socket %pI4 fd=%d on interface %s: errno=%d: %s", |
975 | &igmp->ifaddr, igmp->fd, | |
d62a17ae | 976 | igmp->interface->name, errno, safe_strerror(errno)); |
977 | } | |
978 | ||
a96d64b0 | 979 | if (PIM_DEBUG_GM_TRACE_DETAIL) { |
ee2bbf7c MS |
980 | zlog_debug("Deleted IGMP socket %pI4 fd=%d on interface %s", |
981 | &igmp->ifaddr, igmp->fd, | |
d62a17ae | 982 | igmp->interface->name); |
983 | } | |
12e41d03 DL |
984 | } |
985 | ||
c5f76fad | 986 | void igmp_startup_mode_on(struct gm_sock *igmp) |
12e41d03 | 987 | { |
d62a17ae | 988 | struct pim_interface *pim_ifp; |
12e41d03 | 989 | |
d62a17ae | 990 | pim_ifp = igmp->interface->info; |
12e41d03 | 991 | |
d62a17ae | 992 | /* |
993 | RFC 3376: 8.7. Startup Query Count | |
12e41d03 | 994 | |
d62a17ae | 995 | The Startup Query Count is the number of Queries sent out on |
996 | startup, separated by the Startup Query Interval. Default: the | |
997 | Robustness Variable. | |
998 | */ | |
999 | igmp->startup_query_count = igmp->querier_robustness_variable; | |
12e41d03 | 1000 | |
d62a17ae | 1001 | /* |
1002 | Since we're (re)starting, reset QQI to default Query Interval | |
1003 | */ | |
18adcff1 | 1004 | igmp->querier_query_interval = pim_ifp->gm_default_query_interval; |
12e41d03 DL |
1005 | } |
1006 | ||
a16db099 | 1007 | static void igmp_group_free(struct gm_group *group) |
12e41d03 | 1008 | { |
6a154c88 | 1009 | list_delete(&group->group_source_list); |
12e41d03 | 1010 | |
d62a17ae | 1011 | XFREE(MTYPE_PIM_IGMP_GROUP, group); |
12e41d03 DL |
1012 | } |
1013 | ||
dda4d23c | 1014 | static void igmp_group_count_incr(struct pim_interface *pim_ifp) |
339f7695 | 1015 | { |
3e5d8665 DA |
1016 | uint32_t group_count = listcount(pim_ifp->gm_group_list); |
1017 | ||
8934215f SG |
1018 | ++pim_ifp->pim->gm_group_count; |
1019 | if (pim_ifp->pim->gm_group_count == pim_ifp->pim->gm_watermark_limit) { | |
339f7695 | 1020 | zlog_warn( |
1021 | "IGMP group count reached watermark limit: %u(vrf: %s)", | |
8934215f | 1022 | pim_ifp->pim->gm_group_count, |
339f7695 | 1023 | VRF_LOGNAME(pim_ifp->pim->vrf)); |
1024 | } | |
3e5d8665 DA |
1025 | |
1026 | if (pim_ifp->igmp_peak_group_count < group_count) | |
1027 | pim_ifp->igmp_peak_group_count = group_count; | |
339f7695 | 1028 | } |
1029 | ||
dda4d23c | 1030 | static void igmp_group_count_decr(struct pim_interface *pim_ifp) |
339f7695 | 1031 | { |
8934215f | 1032 | if (pim_ifp->pim->gm_group_count == 0) { |
339f7695 | 1033 | zlog_warn("Cannot decrement igmp group count below 0(vrf: %s)", |
1034 | VRF_LOGNAME(pim_ifp->pim->vrf)); | |
1035 | return; | |
1036 | } | |
1037 | ||
8934215f | 1038 | --pim_ifp->pim->gm_group_count; |
339f7695 | 1039 | } |
1040 | ||
a16db099 | 1041 | void igmp_group_delete(struct gm_group *group) |
12e41d03 | 1042 | { |
d62a17ae | 1043 | struct listnode *src_node; |
1044 | struct listnode *src_nextnode; | |
51700107 | 1045 | struct gm_source *src; |
dda4d23c | 1046 | struct pim_interface *pim_ifp = group->interface->info; |
d62a17ae | 1047 | |
a96d64b0 | 1048 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 1049 | char group_str[INET_ADDRSTRLEN]; |
1050 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1051 | sizeof(group_str)); | |
dda4d23c DL |
1052 | zlog_debug("Deleting IGMP group %s from interface %s", |
1053 | group_str, group->interface->name); | |
d62a17ae | 1054 | } |
1055 | ||
1056 | for (ALL_LIST_ELEMENTS(group->group_source_list, src_node, src_nextnode, | |
1057 | src)) { | |
1058 | igmp_source_delete(src); | |
1059 | } | |
1060 | ||
28ef0ee1 | 1061 | THREAD_OFF(group->t_group_query_retransmit_timer); |
d62a17ae | 1062 | |
1063 | group_timer_off(group); | |
dda4d23c | 1064 | igmp_group_count_decr(pim_ifp); |
18adcff1 SG |
1065 | listnode_delete(pim_ifp->gm_group_list, group); |
1066 | hash_release(pim_ifp->gm_group_hash, group); | |
d62a17ae | 1067 | |
1068 | igmp_group_free(group); | |
12e41d03 DL |
1069 | } |
1070 | ||
a16db099 | 1071 | void igmp_group_delete_empty_include(struct gm_group *group) |
12e41d03 | 1072 | { |
df5dfb77 DL |
1073 | assert(!group->group_filtermode_isexcl); |
1074 | assert(!listcount(group->group_source_list)); | |
12e41d03 | 1075 | |
d62a17ae | 1076 | igmp_group_delete(group); |
12e41d03 DL |
1077 | } |
1078 | ||
c5f76fad | 1079 | void igmp_sock_free(struct gm_sock *igmp) |
12e41d03 | 1080 | { |
df5dfb77 DL |
1081 | assert(!igmp->t_igmp_read); |
1082 | assert(!igmp->t_igmp_query_timer); | |
1083 | assert(!igmp->t_other_querier_timer); | |
12e41d03 | 1084 | |
d62a17ae | 1085 | XFREE(MTYPE_PIM_IGMP_SOCKET, igmp); |
12e41d03 DL |
1086 | } |
1087 | ||
c5f76fad | 1088 | void igmp_sock_delete(struct gm_sock *igmp) |
12e41d03 | 1089 | { |
d62a17ae | 1090 | struct pim_interface *pim_ifp; |
12e41d03 | 1091 | |
d62a17ae | 1092 | sock_close(igmp); |
12e41d03 | 1093 | |
d62a17ae | 1094 | pim_ifp = igmp->interface->info; |
12e41d03 | 1095 | |
18adcff1 | 1096 | listnode_delete(pim_ifp->gm_socket_list, igmp); |
12e41d03 | 1097 | |
d62a17ae | 1098 | igmp_sock_free(igmp); |
dda4d23c | 1099 | |
18adcff1 | 1100 | if (!listcount(pim_ifp->gm_socket_list)) |
dda4d23c | 1101 | pim_igmp_if_reset(pim_ifp); |
12e41d03 DL |
1102 | } |
1103 | ||
d62a17ae | 1104 | void igmp_sock_delete_all(struct interface *ifp) |
cb24fec4 | 1105 | { |
d62a17ae | 1106 | struct pim_interface *pim_ifp; |
1107 | struct listnode *igmp_node, *igmp_nextnode; | |
c5f76fad | 1108 | struct gm_sock *igmp; |
cb24fec4 | 1109 | |
d62a17ae | 1110 | pim_ifp = ifp->info; |
cb24fec4 | 1111 | |
18adcff1 | 1112 | for (ALL_LIST_ELEMENTS(pim_ifp->gm_socket_list, igmp_node, |
29e58225 | 1113 | igmp_nextnode, igmp)) { |
d62a17ae | 1114 | igmp_sock_delete(igmp); |
1115 | } | |
cb24fec4 DS |
1116 | } |
1117 | ||
d8b87afe | 1118 | static unsigned int igmp_group_hash_key(const void *arg) |
6345a326 | 1119 | { |
a16db099 | 1120 | const struct gm_group *group = arg; |
6345a326 | 1121 | |
d62a17ae | 1122 | return jhash_1word(group->group_addr.s_addr, 0); |
6345a326 DS |
1123 | } |
1124 | ||
74df8d6d | 1125 | static bool igmp_group_hash_equal(const void *arg1, const void *arg2) |
6345a326 | 1126 | { |
a16db099 SG |
1127 | const struct gm_group *g1 = (const struct gm_group *)arg1; |
1128 | const struct gm_group *g2 = (const struct gm_group *)arg2; | |
6345a326 | 1129 | |
d62a17ae | 1130 | if (g1->group_addr.s_addr == g2->group_addr.s_addr) |
74df8d6d | 1131 | return true; |
6345a326 | 1132 | |
74df8d6d | 1133 | return false; |
6345a326 DS |
1134 | } |
1135 | ||
dda4d23c DL |
1136 | void pim_igmp_if_init(struct pim_interface *pim_ifp, struct interface *ifp) |
1137 | { | |
1138 | char hash_name[64]; | |
1139 | ||
18adcff1 SG |
1140 | pim_ifp->gm_socket_list = list_new(); |
1141 | pim_ifp->gm_socket_list->del = (void (*)(void *))igmp_sock_free; | |
dda4d23c | 1142 | |
18adcff1 SG |
1143 | pim_ifp->gm_group_list = list_new(); |
1144 | pim_ifp->gm_group_list->del = (void (*)(void *))igmp_group_free; | |
dda4d23c | 1145 | |
a1a4295a | 1146 | snprintf(hash_name, sizeof(hash_name), "IGMP %s hash", ifp->name); |
18adcff1 SG |
1147 | pim_ifp->gm_group_hash = hash_create(igmp_group_hash_key, |
1148 | igmp_group_hash_equal, hash_name); | |
dda4d23c DL |
1149 | } |
1150 | ||
1151 | void pim_igmp_if_reset(struct pim_interface *pim_ifp) | |
1152 | { | |
1153 | struct listnode *grp_node, *grp_nextnode; | |
a16db099 | 1154 | struct gm_group *grp; |
dda4d23c | 1155 | |
18adcff1 | 1156 | for (ALL_LIST_ELEMENTS(pim_ifp->gm_group_list, grp_node, grp_nextnode, |
dda4d23c DL |
1157 | grp)) { |
1158 | igmp_group_delete(grp); | |
1159 | } | |
1160 | } | |
1161 | ||
1162 | void pim_igmp_if_fini(struct pim_interface *pim_ifp) | |
1163 | { | |
1164 | pim_igmp_if_reset(pim_ifp); | |
1165 | ||
18adcff1 SG |
1166 | assert(pim_ifp->gm_group_list); |
1167 | assert(!listcount(pim_ifp->gm_group_list)); | |
dda4d23c | 1168 | |
18adcff1 SG |
1169 | list_delete(&pim_ifp->gm_group_list); |
1170 | hash_free(pim_ifp->gm_group_hash); | |
dda4d23c | 1171 | |
18adcff1 | 1172 | list_delete(&pim_ifp->gm_socket_list); |
dda4d23c DL |
1173 | } |
1174 | ||
c5f76fad SG |
1175 | static struct gm_sock *igmp_sock_new(int fd, struct in_addr ifaddr, |
1176 | struct interface *ifp, int mtrace_only) | |
12e41d03 | 1177 | { |
d62a17ae | 1178 | struct pim_interface *pim_ifp; |
c5f76fad | 1179 | struct gm_sock *igmp; |
d62a17ae | 1180 | |
1181 | pim_ifp = ifp->info; | |
1182 | ||
a96d64b0 | 1183 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 1184 | zlog_debug( |
ee2bbf7c MS |
1185 | "Creating IGMP socket fd=%d for address %pI4 on interface %s", |
1186 | fd, &ifaddr, ifp->name); | |
d62a17ae | 1187 | } |
1188 | ||
1189 | igmp = XCALLOC(MTYPE_PIM_IGMP_SOCKET, sizeof(*igmp)); | |
d62a17ae | 1190 | |
d62a17ae | 1191 | igmp->fd = fd; |
1192 | igmp->interface = ifp; | |
1193 | igmp->ifaddr = ifaddr; | |
9a7cee26 | 1194 | igmp->querier_addr = ifaddr; |
d62a17ae | 1195 | igmp->t_igmp_read = NULL; |
1196 | igmp->t_igmp_query_timer = NULL; | |
1197 | igmp->t_other_querier_timer = NULL; /* no other querier present */ | |
1198 | igmp->querier_robustness_variable = | |
18adcff1 | 1199 | pim_ifp->gm_default_robustness_variable; |
d62a17ae | 1200 | igmp->sock_creation = pim_time_monotonic_sec(); |
1201 | ||
f2058cb4 | 1202 | igmp_stats_init(&igmp->igmp_stats); |
21313cbf | 1203 | |
f83f3966 MS |
1204 | if (mtrace_only) { |
1205 | igmp->mtrace_only = mtrace_only; | |
1206 | return igmp; | |
1207 | } | |
1208 | ||
1209 | igmp->mtrace_only = false; | |
1210 | ||
d62a17ae | 1211 | /* |
1212 | igmp_startup_mode_on() will reset QQI: | |
1213 | ||
18adcff1 | 1214 | igmp->querier_query_interval = pim_ifp->gm_default_query_interval; |
d62a17ae | 1215 | */ |
1216 | igmp_startup_mode_on(igmp); | |
1217 | pim_igmp_general_query_on(igmp); | |
1218 | ||
1219 | return igmp; | |
12e41d03 DL |
1220 | } |
1221 | ||
c5f76fad | 1222 | static void igmp_read_on(struct gm_sock *igmp); |
7923d317 | 1223 | |
cc9f21da | 1224 | static void pim_igmp_read(struct thread *t) |
7923d317 | 1225 | { |
d62a17ae | 1226 | uint8_t buf[10000]; |
c5f76fad | 1227 | struct gm_sock *igmp = (struct gm_sock *)THREAD_ARG(t); |
023d3e4a BG |
1228 | struct sockaddr_storage from; |
1229 | struct sockaddr_storage to; | |
d62a17ae | 1230 | socklen_t fromlen = sizeof(from); |
1231 | socklen_t tolen = sizeof(to); | |
1232 | ifindex_t ifindex = -1; | |
d62a17ae | 1233 | int len; |
1234 | ||
2e1cc436 | 1235 | while (1) { |
d62a17ae | 1236 | len = pim_socket_recvfromto(igmp->fd, buf, sizeof(buf), &from, |
1237 | &fromlen, &to, &tolen, &ifindex); | |
1238 | if (len < 0) { | |
1239 | if (errno == EINTR) | |
1240 | continue; | |
1241 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
1242 | break; | |
1243 | ||
1244 | goto done; | |
1245 | } | |
7923d317 | 1246 | } |
7923d317 | 1247 | |
d62a17ae | 1248 | done: |
1249 | igmp_read_on(igmp); | |
7923d317 DS |
1250 | } |
1251 | ||
c5f76fad | 1252 | static void igmp_read_on(struct gm_sock *igmp) |
7923d317 DS |
1253 | { |
1254 | ||
a96d64b0 | 1255 | if (PIM_DEBUG_GM_TRACE_DETAIL) { |
d62a17ae | 1256 | zlog_debug("Scheduling READ event on IGMP socket fd=%d", |
1257 | igmp->fd); | |
1258 | } | |
36417fcc | 1259 | thread_add_read(router->master, pim_igmp_read, igmp, igmp->fd, |
d62a17ae | 1260 | &igmp->t_igmp_read); |
7923d317 DS |
1261 | } |
1262 | ||
c5f76fad SG |
1263 | struct gm_sock *pim_igmp_sock_add(struct list *igmp_sock_list, |
1264 | struct in_addr ifaddr, struct interface *ifp, | |
1265 | bool mtrace_only) | |
12e41d03 | 1266 | { |
c5f76fad | 1267 | struct gm_sock *igmp; |
d05d3f7a | 1268 | struct sockaddr_in sin; |
d62a17ae | 1269 | int fd; |
12e41d03 | 1270 | |
4f977c8e | 1271 | fd = igmp_sock_open(ifaddr, ifp); |
d62a17ae | 1272 | if (fd < 0) { |
ee2bbf7c MS |
1273 | zlog_warn("Could not open IGMP socket for %pI4 on %s", |
1274 | &ifaddr, ifp->name); | |
d12f46fa | 1275 | return NULL; |
d62a17ae | 1276 | } |
12e41d03 | 1277 | |
d05d3f7a NB |
1278 | sin.sin_family = AF_INET; |
1279 | sin.sin_addr = ifaddr; | |
1280 | sin.sin_port = 0; | |
1281 | if (bind(fd, (struct sockaddr *) &sin, sizeof(sin)) != 0) { | |
262649bd DS |
1282 | zlog_warn("Could not bind IGMP socket for %pI4 on %s: %s(%d)", |
1283 | &ifaddr, ifp->name, strerror(errno), errno); | |
2c85fdd4 DS |
1284 | close(fd); |
1285 | ||
d12f46fa | 1286 | return NULL; |
d05d3f7a NB |
1287 | } |
1288 | ||
f83f3966 | 1289 | igmp = igmp_sock_new(fd, ifaddr, ifp, mtrace_only); |
12e41d03 | 1290 | |
d62a17ae | 1291 | igmp_read_on(igmp); |
7923d317 | 1292 | |
d62a17ae | 1293 | listnode_add(igmp_sock_list, igmp); |
12e41d03 DL |
1294 | |
1295 | #ifdef IGMP_SOCK_DUMP | |
d62a17ae | 1296 | igmp_sock_dump(igmp_sock_array); |
12e41d03 DL |
1297 | #endif |
1298 | ||
d62a17ae | 1299 | return igmp; |
12e41d03 DL |
1300 | } |
1301 | ||
1302 | /* | |
1303 | RFC 3376: 6.5. Switching Router Filter-Modes | |
1304 | ||
1305 | When a router's filter-mode for a group is EXCLUDE and the group | |
1306 | timer expires, the router filter-mode for the group transitions to | |
1307 | INCLUDE. | |
1308 | ||
1309 | A router uses source records with running source timers as its state | |
1310 | for the switch to a filter-mode of INCLUDE. If there are any source | |
1311 | records with source timers greater than zero (i.e., requested to be | |
1312 | forwarded), a router switches to filter-mode of INCLUDE using those | |
1313 | source records. Source records whose timers are zero (from the | |
1314 | previous EXCLUDE mode) are deleted. | |
1315 | */ | |
cc9f21da | 1316 | static void igmp_group_timer(struct thread *t) |
12e41d03 | 1317 | { |
a16db099 | 1318 | struct gm_group *group; |
12e41d03 | 1319 | |
d62a17ae | 1320 | group = THREAD_ARG(t); |
12e41d03 | 1321 | |
a96d64b0 | 1322 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 1323 | char group_str[INET_ADDRSTRLEN]; |
1324 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1325 | sizeof(group_str)); | |
15569c58 | 1326 | zlog_debug("%s: Timer for group %s on interface %s", __func__, |
dda4d23c | 1327 | group_str, group->interface->name); |
d62a17ae | 1328 | } |
12e41d03 | 1329 | |
df5dfb77 | 1330 | assert(group->group_filtermode_isexcl); |
12e41d03 | 1331 | |
d62a17ae | 1332 | group->group_filtermode_isexcl = 0; |
12e41d03 | 1333 | |
d62a17ae | 1334 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ |
1335 | igmp_anysource_forward_stop(group); | |
12e41d03 | 1336 | |
d62a17ae | 1337 | igmp_source_delete_expired(group->group_source_list); |
12e41d03 | 1338 | |
df5dfb77 | 1339 | assert(!group->group_filtermode_isexcl); |
12e41d03 | 1340 | |
d62a17ae | 1341 | /* |
1342 | RFC 3376: 6.2.2. Definition of Group Timers | |
12e41d03 | 1343 | |
d62a17ae | 1344 | If there are no more source records for the group, delete group |
1345 | record. | |
1346 | */ | |
1347 | if (listcount(group->group_source_list) < 1) { | |
1348 | igmp_group_delete_empty_include(group); | |
1349 | } | |
12e41d03 DL |
1350 | } |
1351 | ||
a16db099 | 1352 | static void group_timer_off(struct gm_group *group) |
12e41d03 | 1353 | { |
d62a17ae | 1354 | if (!group->t_group_timer) |
1355 | return; | |
1356 | ||
a96d64b0 | 1357 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 1358 | char group_str[INET_ADDRSTRLEN]; |
1359 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1360 | sizeof(group_str)); | |
1361 | zlog_debug("Cancelling TIMER event for group %s on %s", | |
dda4d23c | 1362 | group_str, group->interface->name); |
d62a17ae | 1363 | } |
1364 | THREAD_OFF(group->t_group_timer); | |
12e41d03 DL |
1365 | } |
1366 | ||
a16db099 | 1367 | void igmp_group_timer_on(struct gm_group *group, long interval_msec, |
d62a17ae | 1368 | const char *ifname) |
12e41d03 | 1369 | { |
d62a17ae | 1370 | group_timer_off(group); |
1371 | ||
95b13dc5 | 1372 | if (PIM_DEBUG_GM_EVENTS) { |
d62a17ae | 1373 | char group_str[INET_ADDRSTRLEN]; |
1374 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1375 | sizeof(group_str)); | |
1376 | zlog_debug( | |
1377 | "Scheduling %ld.%03ld sec TIMER event for group %s on %s", | |
1378 | interval_msec / 1000, interval_msec % 1000, group_str, | |
1379 | ifname); | |
1380 | } | |
1381 | ||
1382 | /* | |
1383 | RFC 3376: 6.2.2. Definition of Group Timers | |
1384 | ||
1385 | The group timer is only used when a group is in EXCLUDE mode and | |
1386 | it represents the time for the *filter-mode* of the group to | |
1387 | expire and switch to INCLUDE mode. | |
1388 | */ | |
df5dfb77 | 1389 | assert(group->group_filtermode_isexcl); |
d62a17ae | 1390 | |
36417fcc DS |
1391 | thread_add_timer_msec(router->master, igmp_group_timer, group, |
1392 | interval_msec, &group->t_group_timer); | |
12e41d03 DL |
1393 | } |
1394 | ||
c5f76fad | 1395 | struct gm_group *find_group_by_addr(struct gm_sock *igmp, |
a16db099 | 1396 | struct in_addr group_addr) |
12e41d03 | 1397 | { |
a16db099 | 1398 | struct gm_group lookup; |
dda4d23c | 1399 | struct pim_interface *pim_ifp = igmp->interface->info; |
12e41d03 | 1400 | |
d62a17ae | 1401 | lookup.group_addr.s_addr = group_addr.s_addr; |
12e41d03 | 1402 | |
18adcff1 | 1403 | return hash_lookup(pim_ifp->gm_group_hash, &lookup); |
12e41d03 DL |
1404 | } |
1405 | ||
c5f76fad | 1406 | struct gm_group *igmp_add_group_by_addr(struct gm_sock *igmp, |
a16db099 | 1407 | struct in_addr group_addr) |
12e41d03 | 1408 | { |
a16db099 | 1409 | struct gm_group *group; |
dda4d23c | 1410 | struct pim_interface *pim_ifp = igmp->interface->info; |
d62a17ae | 1411 | |
1412 | group = find_group_by_addr(igmp, group_addr); | |
1413 | if (group) { | |
1414 | return group; | |
1415 | } | |
1416 | ||
1417 | if (!pim_is_group_224_4(group_addr)) { | |
1418 | zlog_warn("%s: Group Specified is not part of 224.0.0.0/4", | |
15569c58 | 1419 | __func__); |
d62a17ae | 1420 | return NULL; |
1421 | } | |
1422 | ||
1423 | if (pim_is_group_224_0_0_0_24(group_addr)) { | |
a96d64b0 | 1424 | if (PIM_DEBUG_GM_TRACE) |
6b5122a0 | 1425 | zlog_debug( |
ee2bbf7c MS |
1426 | "%s: Group specified %pI4 is part of 224.0.0.0/24", |
1427 | __func__, &group_addr); | |
d62a17ae | 1428 | return NULL; |
1429 | } | |
1430 | /* | |
1431 | Non-existant group is created as INCLUDE {empty}: | |
1432 | ||
1433 | RFC 3376 - 5.1. Action on Change of Interface State | |
1434 | ||
1435 | If no interface state existed for that multicast address before | |
1436 | the change (i.e., the change consisted of creating a new | |
1437 | per-interface record), or if no state exists after the change | |
1438 | (i.e., the change consisted of deleting a per-interface record), | |
1439 | then the "non-existent" state is considered to have a filter mode | |
1440 | of INCLUDE and an empty source list. | |
1441 | */ | |
1442 | ||
1443 | group = XCALLOC(MTYPE_PIM_IGMP_GROUP, sizeof(*group)); | |
d62a17ae | 1444 | |
1445 | group->group_source_list = list_new(); | |
d62a17ae | 1446 | group->group_source_list->del = (void (*)(void *))igmp_source_free; |
1447 | ||
1448 | group->t_group_timer = NULL; | |
1449 | group->t_group_query_retransmit_timer = NULL; | |
1450 | group->group_specific_query_retransmit_count = 0; | |
1451 | group->group_addr = group_addr; | |
dda4d23c | 1452 | group->interface = igmp->interface; |
d62a17ae | 1453 | group->last_igmp_v1_report_dsec = -1; |
1454 | group->last_igmp_v2_report_dsec = -1; | |
1455 | group->group_creation = pim_time_monotonic_sec(); | |
1456 | group->igmp_version = IGMP_DEFAULT_VERSION; | |
1457 | ||
1458 | /* initialize new group as INCLUDE {empty} */ | |
1459 | group->group_filtermode_isexcl = 0; /* 0=INCLUDE, 1=EXCLUDE */ | |
1460 | ||
18adcff1 SG |
1461 | listnode_add(pim_ifp->gm_group_list, group); |
1462 | group = hash_get(pim_ifp->gm_group_hash, group, hash_alloc_intern); | |
d62a17ae | 1463 | |
a96d64b0 | 1464 | if (PIM_DEBUG_GM_TRACE) { |
d62a17ae | 1465 | char group_str[INET_ADDRSTRLEN]; |
1466 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1467 | sizeof(group_str)); | |
1468 | zlog_debug( | |
1469 | "Creating new IGMP group %s on socket %d interface %s", | |
1470 | group_str, igmp->fd, igmp->interface->name); | |
1471 | } | |
1472 | ||
dda4d23c | 1473 | igmp_group_count_incr(pim_ifp); |
339f7695 | 1474 | |
d62a17ae | 1475 | /* |
1476 | RFC 3376: 6.2.2. Definition of Group Timers | |
1477 | ||
1478 | The group timer is only used when a group is in EXCLUDE mode and | |
1479 | it represents the time for the *filter-mode* of the group to | |
1480 | expire and switch to INCLUDE mode. | |
1481 | */ | |
df5dfb77 DL |
1482 | assert(!group->group_filtermode_isexcl); /* INCLUDE mode */ |
1483 | assert(!group->t_group_timer); /* group timer == 0 */ | |
d62a17ae | 1484 | |
1485 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
1486 | igmp_anysource_forward_stop(group); | |
1487 | ||
1488 | return group; | |
12e41d03 | 1489 | } |
b05b72e8 | 1490 | |
278912ea DA |
1491 | void igmp_send_query(int igmp_version, struct gm_group *group, char *query_buf, |
1492 | int query_buf_size, int num_sources, | |
1493 | struct in_addr dst_addr, struct in_addr group_addr, | |
d62a17ae | 1494 | int query_max_response_time_dsec, uint8_t s_flag, |
278912ea | 1495 | struct gm_sock *igmp) |
b05b72e8 | 1496 | { |
278912ea DA |
1497 | if (pim_addr_is_any(group_addr) && |
1498 | ntohl(dst_addr.s_addr) == INADDR_ALLHOSTS_GROUP) | |
1499 | igmp->igmp_stats.general_queries_sent++; | |
1500 | else if (group) | |
1501 | igmp->igmp_stats.group_queries_sent++; | |
1502 | ||
d62a17ae | 1503 | if (igmp_version == 3) { |
278912ea DA |
1504 | igmp_v3_send_query(group, igmp->fd, igmp->interface->name, |
1505 | query_buf, query_buf_size, num_sources, | |
1506 | dst_addr, group_addr, | |
d62a17ae | 1507 | query_max_response_time_dsec, s_flag, |
278912ea DA |
1508 | igmp->querier_robustness_variable, |
1509 | igmp->querier_query_interval); | |
d62a17ae | 1510 | } else if (igmp_version == 2) { |
278912ea DA |
1511 | igmp_v2_send_query(group, igmp->fd, igmp->interface->name, |
1512 | query_buf, dst_addr, group_addr, | |
1513 | query_max_response_time_dsec); | |
d62a17ae | 1514 | } |
b05b72e8 | 1515 | } |
6741a5bb | 1516 | |
1517 | void igmp_send_query_on_intf(struct interface *ifp, int igmp_ver) | |
1518 | { | |
1519 | struct pim_interface *pim_ifp = ifp->info; | |
1520 | struct listnode *sock_node = NULL; | |
c5f76fad | 1521 | struct gm_sock *igmp = NULL; |
6741a5bb | 1522 | struct in_addr dst_addr; |
1523 | struct in_addr group_addr; | |
1524 | int query_buf_size; | |
1525 | ||
1526 | if (!igmp_ver) | |
1527 | igmp_ver = 2; | |
1528 | ||
1529 | if (igmp_ver == 3) | |
1530 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; | |
1531 | else | |
1532 | query_buf_size = IGMP_V12_MSG_SIZE; | |
1533 | ||
1534 | dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); | |
1535 | group_addr.s_addr = PIM_NET_INADDR_ANY; | |
1536 | ||
a96d64b0 | 1537 | if (PIM_DEBUG_GM_TRACE) |
18adcff1 | 1538 | zlog_debug("Issuing general query on request on %s", ifp->name); |
6741a5bb | 1539 | |
18adcff1 | 1540 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->gm_socket_list, sock_node, igmp)) { |
6741a5bb | 1541 | |
1542 | char query_buf[query_buf_size]; | |
1543 | ||
278912ea DA |
1544 | igmp_send_query( |
1545 | igmp_ver, 0 /* igmp_group */, query_buf, | |
1546 | sizeof(query_buf), 0 /* num_sources */, dst_addr, | |
1547 | group_addr, pim_ifp->gm_query_max_response_time_dsec, | |
1548 | 1 /* s_flag: always set for general queries */, igmp); | |
6741a5bb | 1549 | } |
1550 | } |