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12e41d03 DL |
1 | /* |
2 | PIM for Quagga | |
3 | Copyright (C) 2008 Everton da Silva Marques | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, but | |
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; see the file COPYING; if not, write to the | |
17 | Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |
18 | MA 02110-1301 USA | |
12e41d03 DL |
19 | */ |
20 | ||
21 | #include <zebra.h> | |
22 | ||
23 | #include "memory.h" | |
74fb6c66 | 24 | #include "prefix.h" |
9df99407 | 25 | #include "if.h" |
6345a326 DS |
26 | #include "hash.h" |
27 | #include "jhash.h" | |
12e41d03 DL |
28 | |
29 | #include "pimd.h" | |
30 | #include "pim_igmp.h" | |
b05b72e8 | 31 | #include "pim_igmpv2.h" |
12e41d03 DL |
32 | #include "pim_igmpv3.h" |
33 | #include "pim_iface.h" | |
34 | #include "pim_sock.h" | |
35 | #include "pim_mroute.h" | |
36 | #include "pim_str.h" | |
37 | #include "pim_util.h" | |
38 | #include "pim_time.h" | |
39 | #include "pim_zebra.h" | |
40 | ||
12e41d03 DL |
41 | static void group_timer_off(struct igmp_group *group); |
42 | ||
b05b72e8 DW |
43 | /* This socket is used for TXing IGMP packets only, IGMP RX happens |
44 | * in pim_mroute_msg() | |
45 | */ | |
b35702d0 | 46 | static int igmp_sock_open(struct in_addr ifaddr, struct interface *ifp, uint32_t pim_options) |
12e41d03 DL |
47 | { |
48 | int fd; | |
49 | int join = 0; | |
50 | struct in_addr group; | |
51 | ||
b35702d0 | 52 | fd = pim_socket_mcast(IPPROTO_IGMP, ifaddr, ifp, 1); |
b05b72e8 | 53 | |
12e41d03 DL |
54 | if (fd < 0) |
55 | return -1; | |
56 | ||
57 | if (PIM_IF_TEST_IGMP_LISTEN_ALLROUTERS(pim_options)) { | |
58 | if (inet_aton(PIM_ALL_ROUTERS, &group)) { | |
b35702d0 | 59 | if (!pim_socket_join(fd, group, ifaddr, ifp->ifindex)) |
b05b72e8 | 60 | ++join; |
12e41d03 DL |
61 | } |
62 | else { | |
63 | zlog_warn("%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s", | |
b05b72e8 DW |
64 | __FILE__, __PRETTY_FUNCTION__, fd, inet_ntoa(ifaddr), |
65 | PIM_ALL_ROUTERS, errno, safe_strerror(errno)); | |
12e41d03 DL |
66 | } |
67 | } | |
68 | ||
69 | /* | |
70 | IGMP routers periodically send IGMP general queries to AllSystems=224.0.0.1 | |
71 | IGMP routers must receive general queries for querier election. | |
72 | */ | |
73 | if (inet_aton(PIM_ALL_SYSTEMS, &group)) { | |
b35702d0 | 74 | if (!pim_socket_join(fd, group, ifaddr, ifp->ifindex)) |
12e41d03 DL |
75 | ++join; |
76 | } | |
77 | else { | |
78 | zlog_warn("%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s", | |
b05b72e8 DW |
79 | __FILE__, __PRETTY_FUNCTION__, fd, inet_ntoa(ifaddr), |
80 | PIM_ALL_SYSTEMS, errno, safe_strerror(errno)); | |
12e41d03 DL |
81 | } |
82 | ||
83 | if (inet_aton(PIM_ALL_IGMP_ROUTERS, &group)) { | |
b35702d0 | 84 | if (!pim_socket_join(fd, group, ifaddr, ifp->ifindex)) { |
12e41d03 DL |
85 | ++join; |
86 | } | |
87 | } | |
88 | else { | |
89 | zlog_warn("%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s", | |
b05b72e8 DW |
90 | __FILE__, __PRETTY_FUNCTION__, fd, inet_ntoa(ifaddr), |
91 | PIM_ALL_IGMP_ROUTERS, errno, safe_strerror(errno)); | |
12e41d03 DL |
92 | } |
93 | ||
94 | if (!join) { | |
95 | zlog_err("IGMP socket fd=%d could not join any group on interface address %s", | |
b05b72e8 | 96 | fd, inet_ntoa(ifaddr)); |
12e41d03 DL |
97 | close(fd); |
98 | fd = -1; | |
99 | } | |
100 | ||
101 | return fd; | |
102 | } | |
103 | ||
104 | #undef IGMP_SOCK_DUMP | |
105 | ||
106 | #ifdef IGMP_SOCK_DUMP | |
107 | static void igmp_sock_dump(array_t *igmp_sock_array) | |
108 | { | |
109 | int size = array_size(igmp_sock_array); | |
110 | for (int i = 0; i < size; ++i) { | |
111 | ||
112 | struct igmp_sock *igmp = array_get(igmp_sock_array, i); | |
113 | ||
114 | zlog_debug("%s %s: [%d/%d] igmp_addr=%s fd=%d", | |
115 | __FILE__, __PRETTY_FUNCTION__, | |
116 | i, size, | |
117 | inet_ntoa(igmp->ifaddr), | |
118 | igmp->fd); | |
119 | } | |
120 | } | |
121 | #endif | |
122 | ||
123 | struct igmp_sock *pim_igmp_sock_lookup_ifaddr(struct list *igmp_sock_list, | |
124 | struct in_addr ifaddr) | |
125 | { | |
126 | struct listnode *sock_node; | |
127 | struct igmp_sock *igmp; | |
128 | ||
129 | #ifdef IGMP_SOCK_DUMP | |
130 | igmp_sock_dump(igmp_sock_list); | |
131 | #endif | |
132 | ||
133 | for (ALL_LIST_ELEMENTS_RO(igmp_sock_list, sock_node, igmp)) | |
134 | if (ifaddr.s_addr == igmp->ifaddr.s_addr) | |
135 | return igmp; | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | struct igmp_sock *igmp_sock_lookup_by_fd(struct list *igmp_sock_list, | |
141 | int fd) | |
142 | { | |
143 | struct listnode *sock_node; | |
144 | struct igmp_sock *igmp; | |
145 | ||
146 | for (ALL_LIST_ELEMENTS_RO(igmp_sock_list, sock_node, igmp)) | |
147 | if (fd == igmp->fd) | |
148 | return igmp; | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static int pim_igmp_other_querier_expire(struct thread *t) | |
154 | { | |
155 | struct igmp_sock *igmp; | |
156 | ||
12e41d03 | 157 | igmp = THREAD_ARG(t); |
12e41d03 DL |
158 | |
159 | zassert(igmp->t_other_querier_timer); | |
160 | zassert(!igmp->t_igmp_query_timer); | |
161 | ||
162 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 163 | char ifaddr_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
164 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str)); |
165 | zlog_debug("%s: Querier %s resuming", | |
166 | __PRETTY_FUNCTION__, | |
167 | ifaddr_str); | |
168 | } | |
169 | ||
59ba0ac3 | 170 | igmp->t_other_querier_timer = NULL; |
12e41d03 DL |
171 | |
172 | /* | |
173 | We are the current querier, then | |
174 | re-start sending general queries. | |
175 | */ | |
176 | pim_igmp_general_query_on(igmp); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | void pim_igmp_other_querier_timer_on(struct igmp_sock *igmp) | |
182 | { | |
183 | long other_querier_present_interval_msec; | |
184 | struct pim_interface *pim_ifp; | |
185 | ||
186 | zassert(igmp); | |
187 | zassert(igmp->interface); | |
188 | zassert(igmp->interface->info); | |
189 | ||
190 | pim_ifp = igmp->interface->info; | |
191 | ||
192 | if (igmp->t_other_querier_timer) { | |
193 | /* | |
194 | There is other querier present already, | |
195 | then reset the other-querier-present timer. | |
196 | */ | |
197 | ||
198 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 199 | char ifaddr_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
200 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str)); |
201 | zlog_debug("Querier %s resetting TIMER event for Other-Querier-Present", | |
202 | ifaddr_str); | |
203 | } | |
204 | ||
205 | THREAD_OFF(igmp->t_other_querier_timer); | |
206 | zassert(!igmp->t_other_querier_timer); | |
207 | } | |
208 | else { | |
209 | /* | |
210 | We are the current querier, then stop sending general queries: | |
59ba0ac3 | 211 | igmp->t_igmp_query_timer = NULL; |
12e41d03 DL |
212 | */ |
213 | pim_igmp_general_query_off(igmp); | |
214 | } | |
215 | ||
216 | /* | |
217 | Since this socket is starting the other-querier-present timer, | |
218 | there should not be periodic query timer for this socket. | |
219 | */ | |
220 | zassert(!igmp->t_igmp_query_timer); | |
221 | ||
222 | /* | |
223 | RFC 3376: 8.5. Other Querier Present Interval | |
224 | ||
225 | The Other Querier Present Interval is the length of time that must | |
226 | pass before a multicast router decides that there is no longer | |
227 | another multicast router which should be the querier. This value | |
228 | MUST be ((the Robustness Variable) times (the Query Interval)) plus | |
229 | (one half of one Query Response Interval). | |
230 | ||
231 | other_querier_present_interval_msec = \ | |
232 | igmp->querier_robustness_variable * \ | |
233 | 1000 * igmp->querier_query_interval + \ | |
234 | 100 * (pim_ifp->query_max_response_time_dsec >> 1); | |
235 | */ | |
236 | other_querier_present_interval_msec = | |
237 | PIM_IGMP_OQPI_MSEC(igmp->querier_robustness_variable, | |
238 | igmp->querier_query_interval, | |
239 | pim_ifp->igmp_query_max_response_time_dsec); | |
240 | ||
241 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 242 | char ifaddr_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
243 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str)); |
244 | zlog_debug("Querier %s scheduling %ld.%03ld sec TIMER event for Other-Querier-Present", | |
245 | ifaddr_str, | |
246 | other_querier_present_interval_msec / 1000, | |
247 | other_querier_present_interval_msec % 1000); | |
248 | } | |
249 | ||
250 | THREAD_TIMER_MSEC_ON(master, igmp->t_other_querier_timer, | |
251 | pim_igmp_other_querier_expire, | |
252 | igmp, other_querier_present_interval_msec); | |
253 | } | |
254 | ||
255 | void pim_igmp_other_querier_timer_off(struct igmp_sock *igmp) | |
256 | { | |
257 | zassert(igmp); | |
258 | ||
259 | if (PIM_DEBUG_IGMP_TRACE) { | |
260 | if (igmp->t_other_querier_timer) { | |
eaa54bdb | 261 | char ifaddr_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
262 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str)); |
263 | zlog_debug("IGMP querier %s fd=%d cancelling other-querier-present TIMER event on %s", | |
264 | ifaddr_str, igmp->fd, igmp->interface->name); | |
265 | } | |
266 | } | |
267 | THREAD_OFF(igmp->t_other_querier_timer); | |
268 | zassert(!igmp->t_other_querier_timer); | |
269 | } | |
270 | ||
b05b72e8 DW |
271 | static int |
272 | igmp_recv_query(struct igmp_sock *igmp, int query_version, | |
273 | int max_resp_code, | |
274 | struct in_addr from, const char *from_str, | |
275 | char *igmp_msg, int igmp_msg_len) | |
12e41d03 DL |
276 | { |
277 | struct interface *ifp; | |
278 | struct pim_interface *pim_ifp; | |
12e41d03 DL |
279 | struct in_addr group_addr; |
280 | uint16_t recv_checksum; | |
281 | uint16_t checksum; | |
12e41d03 | 282 | |
12e41d03 DL |
283 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
284 | ||
285 | ifp = igmp->interface; | |
286 | pim_ifp = ifp->info; | |
287 | ||
b05b72e8 | 288 | recv_checksum = *(uint16_t *) (igmp_msg + IGMP_CHECKSUM_OFFSET); |
12e41d03 DL |
289 | |
290 | /* for computing checksum */ | |
b05b72e8 | 291 | *(uint16_t *) (igmp_msg + IGMP_CHECKSUM_OFFSET) = 0; |
12e41d03 DL |
292 | |
293 | checksum = in_cksum(igmp_msg, igmp_msg_len); | |
294 | if (checksum != recv_checksum) { | |
295 | zlog_warn("Recv IGMP query v%d from %s on %s: checksum mismatch: received=%x computed=%x", | |
296 | query_version, from_str, ifp->name, recv_checksum, checksum); | |
297 | return -1; | |
298 | } | |
299 | ||
b05b72e8 DW |
300 | /* RFC 3376 defines some guidelines on operating in backwards compatibility |
301 | * with older versions of IGMP but there are some gaps in the logic: | |
302 | * | |
303 | * - once we drop from say version 3 to version 2 we will never go back to | |
304 | * version 3 even if the node that TXed an IGMP v2 query upgrades to v3 | |
305 | * | |
306 | * - The node with the lowest IP is the querier so we will only know to drop | |
307 | * from v3 to v2 if the node that is the querier is also the one that is | |
308 | * running igmp v2. If a non-querier only supports igmp v2 we will have | |
309 | * no way of knowing. | |
310 | * | |
311 | * For now we will simplify things and inform the user that they need to | |
312 | * configure all PIM routers to use the same version of IGMP. | |
313 | */ | |
314 | if (query_version != pim_ifp->igmp_version) { | |
315 | zlog_warn("Recv IGMP query v%d from %s on %s but we are using v%d, please " | |
316 | "configure all PIM routers on this subnet to use the same " | |
317 | "IGMP version", | |
318 | query_version, from_str, ifp->name, pim_ifp->igmp_version); | |
319 | return 0; | |
320 | } | |
321 | ||
12e41d03 | 322 | if (PIM_DEBUG_IGMP_PACKETS) { |
eaa54bdb | 323 | char group_str[INET_ADDRSTRLEN]; |
12e41d03 | 324 | pim_inet4_dump("<group?>", group_addr, group_str, sizeof(group_str)); |
b05b72e8 DW |
325 | zlog_debug("Recv IGMP query v%d from %s on %s for group %s", |
326 | query_version, from_str, ifp->name, group_str); | |
12e41d03 DL |
327 | } |
328 | ||
329 | /* | |
330 | RFC 3376: 6.6.2. Querier Election | |
331 | ||
332 | When a router receives a query with a lower IP address, it sets | |
333 | the Other-Querier-Present timer to Other Querier Present Interval | |
334 | and ceases to send queries on the network if it was the previously | |
335 | elected querier. | |
336 | */ | |
337 | if (ntohl(from.s_addr) < ntohl(igmp->ifaddr.s_addr)) { | |
b05b72e8 | 338 | |
12e41d03 | 339 | if (PIM_DEBUG_IGMP_TRACE) { |
eaa54bdb | 340 | char ifaddr_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
341 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str)); |
342 | zlog_debug("%s: local address %s (%u) lost querier election to %s (%u)", | |
343 | ifp->name, | |
344 | ifaddr_str, ntohl(igmp->ifaddr.s_addr), | |
345 | from_str, ntohl(from.s_addr)); | |
346 | } | |
347 | ||
348 | pim_igmp_other_querier_timer_on(igmp); | |
349 | } | |
350 | ||
b05b72e8 | 351 | /* IGMP version 3 is the only one where we process the RXed query */ |
12e41d03 | 352 | if (query_version == 3) { |
b05b72e8 | 353 | igmp_v3_recv_query(igmp, from_str, igmp_msg); |
12e41d03 DL |
354 | } |
355 | ||
12e41d03 DL |
356 | return 0; |
357 | } | |
358 | ||
359 | static void on_trace(const char *label, | |
360 | struct interface *ifp, struct in_addr from) | |
361 | { | |
362 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 363 | char from_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
364 | pim_inet4_dump("<from?>", from, from_str, sizeof(from_str)); |
365 | zlog_debug("%s: from %s on %s", | |
366 | label, from_str, ifp->name); | |
367 | } | |
368 | } | |
369 | ||
b05b72e8 DW |
370 | static int |
371 | igmp_v1_recv_report (struct igmp_sock *igmp, | |
372 | struct in_addr from, const char *from_str, | |
373 | char *igmp_msg, int igmp_msg_len) | |
12e41d03 DL |
374 | { |
375 | struct interface *ifp = igmp->interface; | |
376 | struct igmp_group *group; | |
377 | struct in_addr group_addr; | |
378 | ||
379 | on_trace(__PRETTY_FUNCTION__, igmp->interface, from); | |
380 | ||
381 | if (igmp_msg_len != IGMP_V12_MSG_SIZE) { | |
382 | zlog_warn("Recv IGMP report v1 from %s on %s: size=%d other than correct=%d", | |
383 | from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE); | |
384 | return -1; | |
385 | } | |
386 | ||
387 | if (PIM_DEBUG_IGMP_TRACE) { | |
388 | zlog_warn("%s %s: FIXME WRITEME", | |
389 | __FILE__, __PRETTY_FUNCTION__); | |
390 | } | |
391 | ||
12e41d03 DL |
392 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
393 | ||
394 | /* non-existant group is created as INCLUDE {empty} */ | |
915c13b3 | 395 | group = igmp_add_group_by_addr(igmp, group_addr); |
12e41d03 DL |
396 | if (!group) { |
397 | return -1; | |
398 | } | |
399 | ||
400 | group->last_igmp_v1_report_dsec = pim_time_monotonic_dsec(); | |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
405 | int pim_igmp_packet(struct igmp_sock *igmp, char *buf, size_t len) | |
406 | { | |
407 | struct ip *ip_hdr; | |
408 | size_t ip_hlen; /* ip header length in bytes */ | |
409 | char *igmp_msg; | |
410 | int igmp_msg_len; | |
411 | int msg_type; | |
eaa54bdb DW |
412 | char from_str[INET_ADDRSTRLEN]; |
413 | char to_str[INET_ADDRSTRLEN]; | |
12e41d03 DL |
414 | |
415 | if (len < sizeof(*ip_hdr)) { | |
416 | zlog_warn("IGMP packet size=%zu shorter than minimum=%zu", | |
417 | len, sizeof(*ip_hdr)); | |
418 | return -1; | |
419 | } | |
420 | ||
421 | ip_hdr = (struct ip *) buf; | |
422 | ||
423 | pim_inet4_dump("<src?>", ip_hdr->ip_src, from_str , sizeof(from_str)); | |
424 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, to_str , sizeof(to_str)); | |
425 | ||
426 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ | |
427 | ||
428 | if (PIM_DEBUG_IGMP_PACKETS) { | |
429 | zlog_debug("Recv IP packet from %s to %s on %s: size=%zu ip_header_size=%zu ip_proto=%d", | |
430 | from_str, to_str, igmp->interface->name, len, ip_hlen, ip_hdr->ip_p); | |
431 | } | |
432 | ||
12e41d03 DL |
433 | igmp_msg = buf + ip_hlen; |
434 | msg_type = *igmp_msg; | |
435 | igmp_msg_len = len - ip_hlen; | |
436 | ||
437 | if (PIM_DEBUG_IGMP_PACKETS) { | |
438 | zlog_debug("Recv IGMP packet from %s to %s on %s: ttl=%d msg_type=%d msg_size=%d", | |
439 | from_str, to_str, igmp->interface->name, ip_hdr->ip_ttl, msg_type, | |
440 | igmp_msg_len); | |
441 | } | |
442 | ||
443 | if (igmp_msg_len < PIM_IGMP_MIN_LEN) { | |
444 | zlog_warn("IGMP message size=%d shorter than minimum=%d", | |
445 | igmp_msg_len, PIM_IGMP_MIN_LEN); | |
446 | return -1; | |
447 | } | |
448 | ||
449 | switch (msg_type) { | |
450 | case PIM_IGMP_MEMBERSHIP_QUERY: | |
451 | { | |
452 | int max_resp_code = igmp_msg[1]; | |
453 | int query_version; | |
454 | ||
455 | /* | |
456 | RFC 3376: 7.1. Query Version Distinctions | |
457 | IGMPv1 Query: length = 8 octets AND Max Resp Code field is zero | |
458 | IGMPv2 Query: length = 8 octets AND Max Resp Code field is non-zero | |
459 | IGMPv3 Query: length >= 12 octets | |
460 | */ | |
461 | ||
462 | if (igmp_msg_len == 8) { | |
463 | query_version = max_resp_code ? 2 : 1; | |
464 | } | |
465 | else if (igmp_msg_len >= 12) { | |
466 | query_version = 3; | |
467 | } | |
468 | else { | |
469 | zlog_warn("Unknown IGMP query version"); | |
470 | return -1; | |
471 | } | |
472 | ||
b05b72e8 | 473 | return igmp_recv_query(igmp, query_version, max_resp_code, |
12e41d03 DL |
474 | ip_hdr->ip_src, from_str, |
475 | igmp_msg, igmp_msg_len); | |
476 | } | |
477 | ||
478 | case PIM_IGMP_V3_MEMBERSHIP_REPORT: | |
b05b72e8 DW |
479 | return igmp_v3_recv_report(igmp, ip_hdr->ip_src, from_str, |
480 | igmp_msg, igmp_msg_len); | |
12e41d03 DL |
481 | |
482 | case PIM_IGMP_V2_MEMBERSHIP_REPORT: | |
b05b72e8 DW |
483 | return igmp_v2_recv_report(igmp, ip_hdr->ip_src, from_str, |
484 | igmp_msg, igmp_msg_len); | |
12e41d03 DL |
485 | |
486 | case PIM_IGMP_V1_MEMBERSHIP_REPORT: | |
b05b72e8 DW |
487 | return igmp_v1_recv_report(igmp, ip_hdr->ip_src, from_str, |
488 | igmp_msg, igmp_msg_len); | |
12e41d03 DL |
489 | |
490 | case PIM_IGMP_V2_LEAVE_GROUP: | |
b05b72e8 DW |
491 | return igmp_v2_recv_leave(igmp, ip_hdr->ip_src, from_str, |
492 | igmp_msg, igmp_msg_len); | |
12e41d03 DL |
493 | } |
494 | ||
495 | zlog_warn("Ignoring unsupported IGMP message type: %d", msg_type); | |
496 | ||
497 | return -1; | |
498 | } | |
499 | ||
500 | static int pim_igmp_general_query(struct thread *t); | |
501 | ||
502 | void pim_igmp_general_query_on(struct igmp_sock *igmp) | |
503 | { | |
504 | struct pim_interface *pim_ifp; | |
505 | int startup_mode; | |
506 | int query_interval; | |
507 | ||
12e41d03 DL |
508 | /* |
509 | Since this socket is starting as querier, | |
510 | there should not exist a timer for other-querier-present. | |
511 | */ | |
512 | zassert(!igmp->t_other_querier_timer); | |
513 | pim_ifp = igmp->interface->info; | |
514 | zassert(pim_ifp); | |
515 | ||
516 | /* | |
517 | RFC 3376: 8.6. Startup Query Interval | |
518 | ||
519 | The Startup Query Interval is the interval between General Queries | |
520 | sent by a Querier on startup. Default: 1/4 the Query Interval. | |
8971ccb2 DS |
521 | The first one should be sent out immediately instead of 125/4 |
522 | seconds from now. | |
12e41d03 DL |
523 | */ |
524 | startup_mode = igmp->startup_query_count > 0; | |
525 | if (startup_mode) { | |
8971ccb2 DS |
526 | /* |
527 | * If this is the first time we are sending a query on a | |
528 | * newly configured igmp interface send it out in 1 second | |
529 | * just to give the entire world a tiny bit of time to settle | |
530 | * else the query interval is: | |
531 | * query_interval = pim_ifp->igmp_default_query_interval >> 2; | |
532 | */ | |
533 | if (igmp->startup_query_count == igmp->querier_robustness_variable) | |
534 | query_interval = 1; | |
535 | else | |
536 | query_interval = PIM_IGMP_SQI(pim_ifp->igmp_default_query_interval); | |
12e41d03 | 537 | |
8971ccb2 | 538 | --igmp->startup_query_count; |
12e41d03 DL |
539 | } |
540 | else { | |
541 | query_interval = igmp->querier_query_interval; | |
542 | } | |
543 | ||
544 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 545 | char ifaddr_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
546 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str)); |
547 | zlog_debug("Querier %s scheduling %d-second (%s) TIMER event for IGMP query on fd=%d", | |
548 | ifaddr_str, | |
549 | query_interval, | |
550 | startup_mode ? "startup" : "non-startup", | |
551 | igmp->fd); | |
552 | } | |
59ba0ac3 | 553 | igmp->t_igmp_query_timer = NULL; |
12e41d03 DL |
554 | THREAD_TIMER_ON(master, igmp->t_igmp_query_timer, |
555 | pim_igmp_general_query, | |
556 | igmp, query_interval); | |
557 | } | |
558 | ||
559 | void pim_igmp_general_query_off(struct igmp_sock *igmp) | |
560 | { | |
561 | zassert(igmp); | |
562 | ||
563 | if (PIM_DEBUG_IGMP_TRACE) { | |
564 | if (igmp->t_igmp_query_timer) { | |
eaa54bdb | 565 | char ifaddr_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
566 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str)); |
567 | zlog_debug("IGMP querier %s fd=%d cancelling query TIMER event on %s", | |
568 | ifaddr_str, igmp->fd, igmp->interface->name); | |
569 | } | |
570 | } | |
571 | THREAD_OFF(igmp->t_igmp_query_timer); | |
12e41d03 DL |
572 | } |
573 | ||
574 | /* Issue IGMP general query */ | |
575 | static int pim_igmp_general_query(struct thread *t) | |
576 | { | |
12e41d03 DL |
577 | struct igmp_sock *igmp; |
578 | struct in_addr dst_addr; | |
579 | struct in_addr group_addr; | |
580 | struct pim_interface *pim_ifp; | |
b05b72e8 | 581 | int query_buf_size; |
12e41d03 | 582 | |
12e41d03 DL |
583 | igmp = THREAD_ARG(t); |
584 | ||
12e41d03 DL |
585 | zassert(igmp->interface); |
586 | zassert(igmp->interface->info); | |
587 | ||
588 | pim_ifp = igmp->interface->info; | |
589 | ||
b05b72e8 DW |
590 | if (pim_ifp->igmp_version == 3) { |
591 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; | |
592 | } else { | |
593 | query_buf_size = IGMP_V12_MSG_SIZE; | |
594 | } | |
595 | ||
596 | char query_buf[query_buf_size]; | |
597 | ||
12e41d03 DL |
598 | /* |
599 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
600 | ||
601 | In IGMPv3, General Queries are sent with an IP destination address | |
602 | of 224.0.0.1, the all-systems multicast address. Group-Specific | |
603 | and Group-and-Source-Specific Queries are sent with an IP | |
604 | destination address equal to the multicast address of interest. | |
605 | */ | |
606 | ||
607 | dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); | |
608 | group_addr.s_addr = PIM_NET_INADDR_ANY; | |
609 | ||
610 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb DW |
611 | char querier_str[INET_ADDRSTRLEN]; |
612 | char dst_str[INET_ADDRSTRLEN]; | |
12e41d03 DL |
613 | pim_inet4_dump("<querier?>", igmp->ifaddr, querier_str, |
614 | sizeof(querier_str)); | |
615 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
616 | zlog_debug("Querier %s issuing IGMP general query to %s on %s", | |
617 | querier_str, dst_str, igmp->interface->name); | |
618 | } | |
619 | ||
b05b72e8 DW |
620 | igmp_send_query (pim_ifp->igmp_version, |
621 | 0 /* igmp_group */, | |
622 | igmp->fd, | |
623 | igmp->interface->name, | |
624 | query_buf, | |
625 | sizeof(query_buf), | |
626 | 0 /* num_sources */, | |
627 | dst_addr, | |
628 | group_addr, | |
629 | pim_ifp->igmp_query_max_response_time_dsec, | |
630 | 1 /* s_flag: always set for general queries */, | |
631 | igmp->querier_robustness_variable, | |
632 | igmp->querier_query_interval); | |
12e41d03 DL |
633 | |
634 | pim_igmp_general_query_on(igmp); | |
635 | ||
636 | return 0; | |
637 | } | |
638 | ||
12e41d03 DL |
639 | static void sock_close(struct igmp_sock *igmp) |
640 | { | |
641 | pim_igmp_other_querier_timer_off(igmp); | |
642 | pim_igmp_general_query_off(igmp); | |
643 | ||
d3a8a0f5 | 644 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { |
12e41d03 DL |
645 | if (igmp->t_igmp_read) { |
646 | zlog_debug("Cancelling READ event on IGMP socket %s fd=%d on interface %s", | |
647 | inet_ntoa(igmp->ifaddr), igmp->fd, | |
648 | igmp->interface->name); | |
649 | } | |
650 | } | |
651 | THREAD_OFF(igmp->t_igmp_read); | |
12e41d03 DL |
652 | |
653 | if (close(igmp->fd)) { | |
654 | zlog_err("Failure closing IGMP socket %s fd=%d on interface %s: errno=%d: %s", | |
655 | inet_ntoa(igmp->ifaddr), igmp->fd, igmp->interface->name, | |
656 | errno, safe_strerror(errno)); | |
657 | } | |
658 | ||
d3a8a0f5 | 659 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { |
12e41d03 DL |
660 | zlog_debug("Deleted IGMP socket %s fd=%d on interface %s", |
661 | inet_ntoa(igmp->ifaddr), igmp->fd, igmp->interface->name); | |
662 | } | |
663 | } | |
664 | ||
665 | void igmp_startup_mode_on(struct igmp_sock *igmp) | |
666 | { | |
667 | struct pim_interface *pim_ifp; | |
668 | ||
669 | pim_ifp = igmp->interface->info; | |
670 | ||
671 | /* | |
672 | RFC 3376: 8.7. Startup Query Count | |
673 | ||
674 | The Startup Query Count is the number of Queries sent out on | |
675 | startup, separated by the Startup Query Interval. Default: the | |
676 | Robustness Variable. | |
677 | */ | |
678 | igmp->startup_query_count = igmp->querier_robustness_variable; | |
679 | ||
680 | /* | |
681 | Since we're (re)starting, reset QQI to default Query Interval | |
682 | */ | |
683 | igmp->querier_query_interval = pim_ifp->igmp_default_query_interval; | |
684 | } | |
685 | ||
686 | static void igmp_group_free(struct igmp_group *group) | |
687 | { | |
12e41d03 DL |
688 | list_free(group->group_source_list); |
689 | ||
690 | XFREE(MTYPE_PIM_IGMP_GROUP, group); | |
691 | } | |
692 | ||
693 | static void igmp_group_delete(struct igmp_group *group) | |
694 | { | |
695 | struct listnode *src_node; | |
696 | struct listnode *src_nextnode; | |
697 | struct igmp_source *src; | |
698 | ||
699 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 700 | char group_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
701 | pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str)); |
702 | zlog_debug("Deleting IGMP group %s from socket %d interface %s", | |
703 | group_str, | |
704 | group->group_igmp_sock->fd, | |
705 | group->group_igmp_sock->interface->name); | |
706 | } | |
707 | ||
708 | for (ALL_LIST_ELEMENTS(group->group_source_list, src_node, src_nextnode, src)) { | |
709 | igmp_source_delete(src); | |
710 | } | |
711 | ||
712 | if (group->t_group_query_retransmit_timer) { | |
713 | THREAD_OFF(group->t_group_query_retransmit_timer); | |
12e41d03 DL |
714 | } |
715 | ||
716 | group_timer_off(group); | |
717 | listnode_delete(group->group_igmp_sock->igmp_group_list, group); | |
6345a326 DS |
718 | hash_release (group->group_igmp_sock->igmp_group_hash, group); |
719 | ||
12e41d03 DL |
720 | igmp_group_free(group); |
721 | } | |
722 | ||
723 | void igmp_group_delete_empty_include(struct igmp_group *group) | |
724 | { | |
725 | zassert(!group->group_filtermode_isexcl); | |
726 | zassert(!listcount(group->group_source_list)); | |
727 | ||
728 | igmp_group_delete(group); | |
729 | } | |
730 | ||
731 | void igmp_sock_free(struct igmp_sock *igmp) | |
732 | { | |
733 | zassert(!igmp->t_igmp_read); | |
734 | zassert(!igmp->t_igmp_query_timer); | |
735 | zassert(!igmp->t_other_querier_timer); | |
736 | zassert(igmp->igmp_group_list); | |
737 | zassert(!listcount(igmp->igmp_group_list)); | |
738 | ||
739 | list_free(igmp->igmp_group_list); | |
6345a326 | 740 | hash_free(igmp->igmp_group_hash); |
12e41d03 DL |
741 | |
742 | XFREE(MTYPE_PIM_IGMP_SOCKET, igmp); | |
743 | } | |
744 | ||
745 | void igmp_sock_delete(struct igmp_sock *igmp) | |
746 | { | |
747 | struct pim_interface *pim_ifp; | |
748 | struct listnode *grp_node; | |
749 | struct listnode *grp_nextnode; | |
750 | struct igmp_group *grp; | |
751 | ||
752 | for (ALL_LIST_ELEMENTS(igmp->igmp_group_list, grp_node, grp_nextnode, grp)) { | |
753 | igmp_group_delete(grp); | |
754 | } | |
755 | ||
756 | sock_close(igmp); | |
757 | ||
758 | pim_ifp = igmp->interface->info; | |
759 | ||
760 | listnode_delete(pim_ifp->igmp_socket_list, igmp); | |
761 | ||
762 | igmp_sock_free(igmp); | |
763 | } | |
764 | ||
cb24fec4 DS |
765 | void |
766 | igmp_sock_delete_all (struct interface *ifp) | |
767 | { | |
768 | struct pim_interface *pim_ifp; | |
769 | struct listnode *igmp_node, *igmp_nextnode; | |
770 | struct igmp_sock *igmp; | |
771 | ||
772 | pim_ifp = ifp->info; | |
773 | ||
774 | for (ALL_LIST_ELEMENTS (pim_ifp->igmp_socket_list, igmp_node, | |
775 | igmp_nextnode, igmp)) | |
776 | { | |
777 | igmp_sock_delete(igmp); | |
778 | } | |
779 | } | |
780 | ||
6345a326 DS |
781 | static unsigned int |
782 | igmp_group_hash_key (void *arg) | |
783 | { | |
784 | struct igmp_group *group = (struct igmp_group *)arg; | |
785 | ||
786 | return jhash_1word(group->group_addr.s_addr, 0); | |
787 | } | |
788 | ||
789 | static int | |
790 | igmp_group_hash_equal (const void *arg1, const void *arg2) | |
791 | { | |
792 | const struct igmp_group *g1 = (const struct igmp_group *)arg1; | |
793 | const struct igmp_group *g2 = (const struct igmp_group *)arg2; | |
794 | ||
795 | if (g1->group_addr.s_addr == g2->group_addr.s_addr) | |
796 | return 1; | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
12e41d03 DL |
801 | static struct igmp_sock *igmp_sock_new(int fd, |
802 | struct in_addr ifaddr, | |
803 | struct interface *ifp) | |
804 | { | |
805 | struct pim_interface *pim_ifp; | |
806 | struct igmp_sock *igmp; | |
807 | ||
808 | pim_ifp = ifp->info; | |
809 | ||
810 | if (PIM_DEBUG_IGMP_TRACE) { | |
811 | zlog_debug("Creating IGMP socket fd=%d for address %s on interface %s", | |
812 | fd, inet_ntoa(ifaddr), ifp->name); | |
813 | } | |
814 | ||
36d9e7dc | 815 | igmp = XCALLOC(MTYPE_PIM_IGMP_SOCKET, sizeof(*igmp)); |
12e41d03 | 816 | if (!igmp) { |
36d9e7dc | 817 | zlog_warn("%s %s: XCALLOC() failure", |
12e41d03 DL |
818 | __FILE__, __PRETTY_FUNCTION__); |
819 | return 0; | |
820 | } | |
821 | ||
822 | igmp->igmp_group_list = list_new(); | |
823 | if (!igmp->igmp_group_list) { | |
824 | zlog_err("%s %s: failure: igmp_group_list = list_new()", | |
825 | __FILE__, __PRETTY_FUNCTION__); | |
826 | return 0; | |
827 | } | |
828 | igmp->igmp_group_list->del = (void (*)(void *)) igmp_group_free; | |
829 | ||
6345a326 DS |
830 | igmp->igmp_group_hash = hash_create (igmp_group_hash_key, |
831 | igmp_group_hash_equal); | |
832 | ||
12e41d03 DL |
833 | igmp->fd = fd; |
834 | igmp->interface = ifp; | |
835 | igmp->ifaddr = ifaddr; | |
59ba0ac3 DS |
836 | igmp->t_igmp_read = NULL; |
837 | igmp->t_igmp_query_timer = NULL; | |
838 | igmp->t_other_querier_timer = NULL; /* no other querier present */ | |
12e41d03 DL |
839 | igmp->querier_robustness_variable = pim_ifp->igmp_default_robustness_variable; |
840 | igmp->sock_creation = pim_time_monotonic_sec(); | |
841 | ||
842 | /* | |
843 | igmp_startup_mode_on() will reset QQI: | |
844 | ||
845 | igmp->querier_query_interval = pim_ifp->igmp_default_query_interval; | |
846 | */ | |
847 | igmp_startup_mode_on(igmp); | |
12e41d03 DL |
848 | pim_igmp_general_query_on(igmp); |
849 | ||
850 | return igmp; | |
851 | } | |
852 | ||
7923d317 DS |
853 | static void igmp_read_on (struct igmp_sock *igmp); |
854 | ||
855 | static int | |
856 | pim_igmp_read (struct thread *t) | |
857 | { | |
858 | uint8_t buf[10000]; | |
859 | struct igmp_sock *igmp = (struct igmp_sock *)THREAD_ARG(t); | |
860 | struct sockaddr_in from; | |
861 | struct sockaddr_in to; | |
862 | socklen_t fromlen = sizeof(from); | |
863 | socklen_t tolen = sizeof(to); | |
864 | ifindex_t ifindex = -1; | |
865 | int cont = 1; | |
866 | int len; | |
867 | ||
868 | while (cont) | |
869 | { | |
870 | len = pim_socket_recvfromto(igmp->fd, buf, sizeof(buf), | |
871 | &from, &fromlen, | |
872 | &to, &tolen, | |
873 | &ifindex); | |
874 | if (len < 0) | |
875 | { | |
876 | if (errno == EINTR) | |
877 | continue; | |
878 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
7923d317 | 879 | break; |
e43223bc | 880 | |
7923d317 DS |
881 | goto done; |
882 | } | |
883 | } | |
884 | ||
885 | done: | |
886 | igmp_read_on(igmp); | |
887 | return 0; | |
888 | } | |
889 | ||
890 | static void | |
891 | igmp_read_on (struct igmp_sock *igmp) | |
892 | { | |
893 | ||
894 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { | |
895 | zlog_debug("Scheduling READ event on IGMP socket fd=%d", | |
896 | igmp->fd); | |
897 | } | |
898 | igmp->t_igmp_read = NULL; | |
899 | THREAD_READ_ON(master, igmp->t_igmp_read, pim_igmp_read, igmp, igmp->fd); | |
900 | ||
901 | } | |
902 | ||
12e41d03 DL |
903 | struct igmp_sock *pim_igmp_sock_add(struct list *igmp_sock_list, |
904 | struct in_addr ifaddr, | |
905 | struct interface *ifp) | |
906 | { | |
907 | struct pim_interface *pim_ifp; | |
908 | struct igmp_sock *igmp; | |
909 | int fd; | |
910 | ||
911 | pim_ifp = ifp->info; | |
912 | ||
b35702d0 | 913 | fd = igmp_sock_open(ifaddr, ifp, pim_ifp->options); |
12e41d03 DL |
914 | if (fd < 0) { |
915 | zlog_warn("Could not open IGMP socket for %s on %s", | |
916 | inet_ntoa(ifaddr), ifp->name); | |
917 | return 0; | |
918 | } | |
919 | ||
920 | igmp = igmp_sock_new(fd, ifaddr, ifp); | |
921 | if (!igmp) { | |
922 | zlog_err("%s %s: igmp_sock_new() failure", | |
923 | __FILE__, __PRETTY_FUNCTION__); | |
924 | close(fd); | |
925 | return 0; | |
926 | } | |
927 | ||
7923d317 DS |
928 | igmp_read_on (igmp); |
929 | ||
12e41d03 DL |
930 | listnode_add(igmp_sock_list, igmp); |
931 | ||
932 | #ifdef IGMP_SOCK_DUMP | |
933 | igmp_sock_dump(igmp_sock_array); | |
934 | #endif | |
935 | ||
936 | return igmp; | |
937 | } | |
938 | ||
939 | /* | |
940 | RFC 3376: 6.5. Switching Router Filter-Modes | |
941 | ||
942 | When a router's filter-mode for a group is EXCLUDE and the group | |
943 | timer expires, the router filter-mode for the group transitions to | |
944 | INCLUDE. | |
945 | ||
946 | A router uses source records with running source timers as its state | |
947 | for the switch to a filter-mode of INCLUDE. If there are any source | |
948 | records with source timers greater than zero (i.e., requested to be | |
949 | forwarded), a router switches to filter-mode of INCLUDE using those | |
950 | source records. Source records whose timers are zero (from the | |
951 | previous EXCLUDE mode) are deleted. | |
952 | */ | |
953 | static int igmp_group_timer(struct thread *t) | |
954 | { | |
955 | struct igmp_group *group; | |
956 | ||
12e41d03 | 957 | group = THREAD_ARG(t); |
12e41d03 DL |
958 | |
959 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 960 | char group_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
961 | pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str)); |
962 | zlog_debug("%s: Timer for group %s on interface %s", | |
963 | __PRETTY_FUNCTION__, | |
964 | group_str, group->group_igmp_sock->interface->name); | |
965 | } | |
966 | ||
967 | zassert(group->group_filtermode_isexcl); | |
968 | ||
09c02cc3 | 969 | group->t_group_timer = NULL; |
12e41d03 DL |
970 | group->group_filtermode_isexcl = 0; |
971 | ||
972 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
973 | igmp_anysource_forward_stop(group); | |
974 | ||
975 | igmp_source_delete_expired(group->group_source_list); | |
976 | ||
977 | zassert(!group->t_group_timer); | |
978 | zassert(!group->group_filtermode_isexcl); | |
979 | ||
980 | /* | |
981 | RFC 3376: 6.2.2. Definition of Group Timers | |
982 | ||
983 | If there are no more source records for the group, delete group | |
984 | record. | |
985 | */ | |
986 | if (listcount(group->group_source_list) < 1) { | |
987 | igmp_group_delete_empty_include(group); | |
988 | } | |
989 | ||
990 | return 0; | |
991 | } | |
992 | ||
993 | static void group_timer_off(struct igmp_group *group) | |
994 | { | |
995 | if (!group->t_group_timer) | |
996 | return; | |
997 | ||
998 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 999 | char group_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
1000 | pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str)); |
1001 | zlog_debug("Cancelling TIMER event for group %s on %s", | |
1002 | group_str, group->group_igmp_sock->interface->name); | |
1003 | } | |
1004 | ||
1005 | THREAD_OFF(group->t_group_timer); | |
1006 | zassert(!group->t_group_timer); | |
1007 | } | |
1008 | ||
1009 | void igmp_group_timer_on(struct igmp_group *group, | |
1010 | long interval_msec, const char *ifname) | |
1011 | { | |
1012 | group_timer_off(group); | |
1013 | ||
1014 | if (PIM_DEBUG_IGMP_EVENTS) { | |
eaa54bdb | 1015 | char group_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
1016 | pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str)); |
1017 | zlog_debug("Scheduling %ld.%03ld sec TIMER event for group %s on %s", | |
1018 | interval_msec / 1000, | |
1019 | interval_msec % 1000, | |
1020 | group_str, ifname); | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | RFC 3376: 6.2.2. Definition of Group Timers | |
1025 | ||
1026 | The group timer is only used when a group is in EXCLUDE mode and | |
1027 | it represents the time for the *filter-mode* of the group to | |
1028 | expire and switch to INCLUDE mode. | |
1029 | */ | |
1030 | zassert(group->group_filtermode_isexcl); | |
1031 | ||
1032 | THREAD_TIMER_MSEC_ON(master, group->t_group_timer, | |
1033 | igmp_group_timer, | |
1034 | group, interval_msec); | |
1035 | } | |
1036 | ||
5b1207f7 DS |
1037 | struct igmp_group * |
1038 | find_group_by_addr (struct igmp_sock *igmp, | |
1039 | struct in_addr group_addr) | |
12e41d03 | 1040 | { |
6345a326 | 1041 | struct igmp_group lookup; |
12e41d03 | 1042 | |
6345a326 | 1043 | lookup.group_addr.s_addr = group_addr.s_addr; |
12e41d03 | 1044 | |
6345a326 | 1045 | return hash_lookup(igmp->igmp_group_hash, &lookup); |
12e41d03 DL |
1046 | } |
1047 | ||
1048 | struct igmp_group *igmp_add_group_by_addr(struct igmp_sock *igmp, | |
915c13b3 | 1049 | struct in_addr group_addr) |
12e41d03 DL |
1050 | { |
1051 | struct igmp_group *group; | |
1052 | ||
1053 | group = find_group_by_addr(igmp, group_addr); | |
1054 | if (group) { | |
1055 | return group; | |
1056 | } | |
1057 | ||
b815998a DS |
1058 | if (!pim_is_group_224_4 (group_addr)) |
1059 | { | |
1060 | zlog_warn("%s: Group Specified is not part of 224.0.0.0/4", | |
1061 | __PRETTY_FUNCTION__); | |
1062 | return NULL; | |
1063 | } | |
1064 | ||
06d1c450 DS |
1065 | if (pim_is_group_224_0_0_0_24 (group_addr)) |
1066 | { | |
1067 | zlog_warn("%s: Group specified is part of 224.0.0.0/24", | |
1068 | __PRETTY_FUNCTION__); | |
1069 | return NULL; | |
1070 | } | |
12e41d03 DL |
1071 | /* |
1072 | Non-existant group is created as INCLUDE {empty}: | |
1073 | ||
1074 | RFC 3376 - 5.1. Action on Change of Interface State | |
1075 | ||
1076 | If no interface state existed for that multicast address before | |
1077 | the change (i.e., the change consisted of creating a new | |
1078 | per-interface record), or if no state exists after the change | |
1079 | (i.e., the change consisted of deleting a per-interface record), | |
1080 | then the "non-existent" state is considered to have a filter mode | |
1081 | of INCLUDE and an empty source list. | |
1082 | */ | |
1083 | ||
36d9e7dc | 1084 | group = XCALLOC(MTYPE_PIM_IGMP_GROUP, sizeof(*group)); |
12e41d03 | 1085 | if (!group) { |
36d9e7dc | 1086 | zlog_warn("%s %s: XCALLOC() failure", |
12e41d03 | 1087 | __FILE__, __PRETTY_FUNCTION__); |
b815998a | 1088 | return NULL; /* error, not found, could not create */ |
12e41d03 DL |
1089 | } |
1090 | ||
1091 | group->group_source_list = list_new(); | |
1092 | if (!group->group_source_list) { | |
1093 | zlog_warn("%s %s: list_new() failure", | |
1094 | __FILE__, __PRETTY_FUNCTION__); | |
1095 | XFREE(MTYPE_PIM_IGMP_GROUP, group); /* discard group */ | |
b815998a | 1096 | return NULL; /* error, not found, could not initialize */ |
12e41d03 DL |
1097 | } |
1098 | group->group_source_list->del = (void (*)(void *)) igmp_source_free; | |
1099 | ||
915c13b3 DS |
1100 | group->t_group_timer = NULL; |
1101 | group->t_group_query_retransmit_timer = NULL; | |
12e41d03 DL |
1102 | group->group_specific_query_retransmit_count = 0; |
1103 | group->group_addr = group_addr; | |
1104 | group->group_igmp_sock = igmp; | |
1105 | group->last_igmp_v1_report_dsec = -1; | |
1106 | group->last_igmp_v2_report_dsec = -1; | |
1107 | group->group_creation = pim_time_monotonic_sec(); | |
b05b72e8 | 1108 | group->igmp_version = IGMP_DEFAULT_VERSION; |
12e41d03 DL |
1109 | |
1110 | /* initialize new group as INCLUDE {empty} */ | |
1111 | group->group_filtermode_isexcl = 0; /* 0=INCLUDE, 1=EXCLUDE */ | |
1112 | ||
1113 | listnode_add(igmp->igmp_group_list, group); | |
6345a326 | 1114 | group = hash_get (igmp->igmp_group_hash, group, hash_alloc_intern); |
12e41d03 DL |
1115 | |
1116 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 1117 | char group_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
1118 | pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str)); |
1119 | zlog_debug("Creating new IGMP group %s on socket %d interface %s", | |
915c13b3 | 1120 | group_str, igmp->fd, igmp->interface->name); |
12e41d03 DL |
1121 | } |
1122 | ||
1123 | /* | |
1124 | RFC 3376: 6.2.2. Definition of Group Timers | |
1125 | ||
1126 | The group timer is only used when a group is in EXCLUDE mode and | |
1127 | it represents the time for the *filter-mode* of the group to | |
1128 | expire and switch to INCLUDE mode. | |
1129 | */ | |
1130 | zassert(!group->group_filtermode_isexcl); /* INCLUDE mode */ | |
1131 | zassert(!group->t_group_timer); /* group timer == 0 */ | |
1132 | ||
1133 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
1134 | igmp_anysource_forward_stop(group); | |
1135 | ||
1136 | return group; | |
1137 | } | |
b05b72e8 DW |
1138 | |
1139 | void | |
1140 | igmp_send_query (int igmp_version, | |
1141 | struct igmp_group *group, | |
1142 | int fd, | |
1143 | const char *ifname, | |
1144 | char *query_buf, | |
1145 | int query_buf_size, | |
1146 | int num_sources, | |
1147 | struct in_addr dst_addr, | |
1148 | struct in_addr group_addr, | |
1149 | int query_max_response_time_dsec, | |
1150 | uint8_t s_flag, | |
1151 | uint8_t querier_robustness_variable, | |
1152 | uint16_t querier_query_interval) | |
1153 | { | |
1154 | if (igmp_version == 3) { | |
1155 | igmp_v3_send_query (group, fd, ifname, query_buf, | |
1156 | query_buf_size, num_sources, | |
1157 | dst_addr, group_addr, | |
1158 | query_max_response_time_dsec, s_flag, | |
1159 | querier_robustness_variable, | |
1160 | querier_query_interval); | |
1161 | } else if (igmp_version == 2) { | |
1162 | igmp_v2_send_query (group, fd, ifname, query_buf, | |
1163 | dst_addr, group_addr, | |
1164 | query_max_response_time_dsec); | |
1165 | } | |
1166 | } |