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