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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 | |
b58ed1f8 | 19 | <<<<<<< HEAD |
12e41d03 | 20 | |
b58ed1f8 DS |
21 | ======= |
22 | >>>>>>> origin/master | |
12e41d03 DL |
23 | */ |
24 | ||
25 | #include <zebra.h> | |
26 | ||
27 | #include "memory.h" | |
74fb6c66 | 28 | #include "prefix.h" |
9df99407 | 29 | #include "if.h" |
12e41d03 DL |
30 | |
31 | #include "pimd.h" | |
32 | #include "pim_igmp.h" | |
b05b72e8 | 33 | #include "pim_igmpv2.h" |
12e41d03 DL |
34 | #include "pim_igmpv3.h" |
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" | |
41 | #include "pim_zebra.h" | |
42 | ||
12e41d03 DL |
43 | static void group_timer_off(struct igmp_group *group); |
44 | ||
b05b72e8 DW |
45 | /* This socket is used for TXing IGMP packets only, IGMP RX happens |
46 | * in pim_mroute_msg() | |
47 | */ | |
b892f1dd | 48 | static int igmp_sock_open(struct in_addr ifaddr, ifindex_t ifindex, uint32_t pim_options) |
12e41d03 DL |
49 | { |
50 | int fd; | |
51 | int join = 0; | |
52 | struct in_addr group; | |
53 | ||
a277fb84 | 54 | fd = pim_socket_mcast(IPPROTO_IGMP, ifaddr, ifindex, 1); |
b05b72e8 | 55 | |
12e41d03 DL |
56 | if (fd < 0) |
57 | return -1; | |
58 | ||
59 | if (PIM_IF_TEST_IGMP_LISTEN_ALLROUTERS(pim_options)) { | |
60 | if (inet_aton(PIM_ALL_ROUTERS, &group)) { | |
61 | if (!pim_socket_join(fd, group, ifaddr, ifindex)) | |
b05b72e8 | 62 | ++join; |
12e41d03 DL |
63 | } |
64 | else { | |
65 | zlog_warn("%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s", | |
b05b72e8 DW |
66 | __FILE__, __PRETTY_FUNCTION__, fd, inet_ntoa(ifaddr), |
67 | PIM_ALL_ROUTERS, errno, safe_strerror(errno)); | |
12e41d03 DL |
68 | } |
69 | } | |
70 | ||
71 | /* | |
72 | IGMP routers periodically send IGMP general queries to AllSystems=224.0.0.1 | |
73 | IGMP routers must receive general queries for querier election. | |
74 | */ | |
75 | if (inet_aton(PIM_ALL_SYSTEMS, &group)) { | |
76 | if (!pim_socket_join(fd, group, ifaddr, ifindex)) | |
77 | ++join; | |
78 | } | |
79 | else { | |
80 | zlog_warn("%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s", | |
b05b72e8 DW |
81 | __FILE__, __PRETTY_FUNCTION__, fd, inet_ntoa(ifaddr), |
82 | PIM_ALL_SYSTEMS, errno, safe_strerror(errno)); | |
12e41d03 DL |
83 | } |
84 | ||
85 | if (inet_aton(PIM_ALL_IGMP_ROUTERS, &group)) { | |
86 | if (!pim_socket_join(fd, group, ifaddr, ifindex)) { | |
87 | ++join; | |
88 | } | |
89 | } | |
90 | else { | |
91 | zlog_warn("%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s", | |
b05b72e8 DW |
92 | __FILE__, __PRETTY_FUNCTION__, fd, inet_ntoa(ifaddr), |
93 | PIM_ALL_IGMP_ROUTERS, errno, safe_strerror(errno)); | |
12e41d03 DL |
94 | } |
95 | ||
96 | if (!join) { | |
97 | zlog_err("IGMP socket fd=%d could not join any group on interface address %s", | |
b05b72e8 | 98 | fd, inet_ntoa(ifaddr)); |
12e41d03 DL |
99 | close(fd); |
100 | fd = -1; | |
101 | } | |
102 | ||
103 | return fd; | |
104 | } | |
105 | ||
106 | #undef IGMP_SOCK_DUMP | |
107 | ||
108 | #ifdef IGMP_SOCK_DUMP | |
109 | static void igmp_sock_dump(array_t *igmp_sock_array) | |
110 | { | |
111 | int size = array_size(igmp_sock_array); | |
112 | for (int i = 0; i < size; ++i) { | |
113 | ||
114 | struct igmp_sock *igmp = array_get(igmp_sock_array, i); | |
115 | ||
116 | zlog_debug("%s %s: [%d/%d] igmp_addr=%s fd=%d", | |
117 | __FILE__, __PRETTY_FUNCTION__, | |
118 | i, size, | |
119 | inet_ntoa(igmp->ifaddr), | |
120 | igmp->fd); | |
121 | } | |
122 | } | |
123 | #endif | |
124 | ||
125 | struct igmp_sock *pim_igmp_sock_lookup_ifaddr(struct list *igmp_sock_list, | |
126 | struct in_addr ifaddr) | |
127 | { | |
128 | struct listnode *sock_node; | |
129 | struct igmp_sock *igmp; | |
130 | ||
131 | #ifdef IGMP_SOCK_DUMP | |
132 | igmp_sock_dump(igmp_sock_list); | |
133 | #endif | |
134 | ||
135 | for (ALL_LIST_ELEMENTS_RO(igmp_sock_list, sock_node, igmp)) | |
136 | if (ifaddr.s_addr == igmp->ifaddr.s_addr) | |
137 | return igmp; | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | struct igmp_sock *igmp_sock_lookup_by_fd(struct list *igmp_sock_list, | |
143 | int fd) | |
144 | { | |
145 | struct listnode *sock_node; | |
146 | struct igmp_sock *igmp; | |
147 | ||
148 | for (ALL_LIST_ELEMENTS_RO(igmp_sock_list, sock_node, igmp)) | |
149 | if (fd == igmp->fd) | |
150 | return igmp; | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static int pim_igmp_other_querier_expire(struct thread *t) | |
156 | { | |
157 | struct igmp_sock *igmp; | |
158 | ||
12e41d03 | 159 | igmp = THREAD_ARG(t); |
12e41d03 DL |
160 | |
161 | zassert(igmp->t_other_querier_timer); | |
162 | zassert(!igmp->t_igmp_query_timer); | |
163 | ||
164 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 165 | char ifaddr_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
166 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str)); |
167 | zlog_debug("%s: Querier %s resuming", | |
168 | __PRETTY_FUNCTION__, | |
169 | ifaddr_str); | |
170 | } | |
171 | ||
59ba0ac3 | 172 | igmp->t_other_querier_timer = NULL; |
12e41d03 DL |
173 | |
174 | /* | |
175 | We are the current querier, then | |
176 | re-start sending general queries. | |
177 | */ | |
178 | pim_igmp_general_query_on(igmp); | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | void pim_igmp_other_querier_timer_on(struct igmp_sock *igmp) | |
184 | { | |
185 | long other_querier_present_interval_msec; | |
186 | struct pim_interface *pim_ifp; | |
187 | ||
188 | zassert(igmp); | |
189 | zassert(igmp->interface); | |
190 | zassert(igmp->interface->info); | |
191 | ||
192 | pim_ifp = igmp->interface->info; | |
193 | ||
194 | if (igmp->t_other_querier_timer) { | |
195 | /* | |
196 | There is other querier present already, | |
197 | then reset the other-querier-present timer. | |
198 | */ | |
199 | ||
200 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 201 | char ifaddr_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
202 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str)); |
203 | zlog_debug("Querier %s resetting TIMER event for Other-Querier-Present", | |
204 | ifaddr_str); | |
205 | } | |
206 | ||
207 | THREAD_OFF(igmp->t_other_querier_timer); | |
208 | zassert(!igmp->t_other_querier_timer); | |
209 | } | |
210 | else { | |
211 | /* | |
212 | We are the current querier, then stop sending general queries: | |
59ba0ac3 | 213 | igmp->t_igmp_query_timer = NULL; |
12e41d03 DL |
214 | */ |
215 | pim_igmp_general_query_off(igmp); | |
216 | } | |
217 | ||
218 | /* | |
219 | Since this socket is starting the other-querier-present timer, | |
220 | there should not be periodic query timer for this socket. | |
221 | */ | |
222 | zassert(!igmp->t_igmp_query_timer); | |
223 | ||
224 | /* | |
225 | RFC 3376: 8.5. Other Querier Present Interval | |
226 | ||
227 | The Other Querier Present Interval is the length of time that must | |
228 | pass before a multicast router decides that there is no longer | |
229 | another multicast router which should be the querier. This value | |
230 | MUST be ((the Robustness Variable) times (the Query Interval)) plus | |
231 | (one half of one Query Response Interval). | |
232 | ||
233 | other_querier_present_interval_msec = \ | |
234 | igmp->querier_robustness_variable * \ | |
235 | 1000 * igmp->querier_query_interval + \ | |
236 | 100 * (pim_ifp->query_max_response_time_dsec >> 1); | |
237 | */ | |
238 | other_querier_present_interval_msec = | |
239 | PIM_IGMP_OQPI_MSEC(igmp->querier_robustness_variable, | |
240 | igmp->querier_query_interval, | |
241 | pim_ifp->igmp_query_max_response_time_dsec); | |
242 | ||
243 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 244 | char ifaddr_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
245 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str)); |
246 | zlog_debug("Querier %s scheduling %ld.%03ld sec TIMER event for Other-Querier-Present", | |
247 | ifaddr_str, | |
248 | other_querier_present_interval_msec / 1000, | |
249 | other_querier_present_interval_msec % 1000); | |
250 | } | |
251 | ||
252 | THREAD_TIMER_MSEC_ON(master, igmp->t_other_querier_timer, | |
253 | pim_igmp_other_querier_expire, | |
254 | igmp, other_querier_present_interval_msec); | |
255 | } | |
256 | ||
257 | void pim_igmp_other_querier_timer_off(struct igmp_sock *igmp) | |
258 | { | |
259 | zassert(igmp); | |
260 | ||
261 | if (PIM_DEBUG_IGMP_TRACE) { | |
262 | if (igmp->t_other_querier_timer) { | |
eaa54bdb | 263 | char ifaddr_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
264 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str)); |
265 | zlog_debug("IGMP querier %s fd=%d cancelling other-querier-present TIMER event on %s", | |
266 | ifaddr_str, igmp->fd, igmp->interface->name); | |
267 | } | |
268 | } | |
269 | THREAD_OFF(igmp->t_other_querier_timer); | |
270 | zassert(!igmp->t_other_querier_timer); | |
271 | } | |
272 | ||
b05b72e8 DW |
273 | static int |
274 | igmp_recv_query(struct igmp_sock *igmp, int query_version, | |
275 | int max_resp_code, | |
276 | struct in_addr from, const char *from_str, | |
277 | char *igmp_msg, int igmp_msg_len) | |
12e41d03 DL |
278 | { |
279 | struct interface *ifp; | |
280 | struct pim_interface *pim_ifp; | |
12e41d03 DL |
281 | struct in_addr group_addr; |
282 | uint16_t recv_checksum; | |
283 | uint16_t checksum; | |
12e41d03 | 284 | |
12e41d03 DL |
285 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
286 | ||
287 | ifp = igmp->interface; | |
288 | pim_ifp = ifp->info; | |
289 | ||
b05b72e8 | 290 | recv_checksum = *(uint16_t *) (igmp_msg + IGMP_CHECKSUM_OFFSET); |
12e41d03 DL |
291 | |
292 | /* for computing checksum */ | |
b05b72e8 | 293 | *(uint16_t *) (igmp_msg + IGMP_CHECKSUM_OFFSET) = 0; |
12e41d03 DL |
294 | |
295 | checksum = in_cksum(igmp_msg, igmp_msg_len); | |
296 | if (checksum != recv_checksum) { | |
297 | zlog_warn("Recv IGMP query v%d from %s on %s: checksum mismatch: received=%x computed=%x", | |
298 | query_version, from_str, ifp->name, recv_checksum, checksum); | |
299 | return -1; | |
300 | } | |
301 | ||
b05b72e8 DW |
302 | /* RFC 3376 defines some guidelines on operating in backwards compatibility |
303 | * with older versions of IGMP but there are some gaps in the logic: | |
304 | * | |
305 | * - once we drop from say version 3 to version 2 we will never go back to | |
306 | * version 3 even if the node that TXed an IGMP v2 query upgrades to v3 | |
307 | * | |
308 | * - The node with the lowest IP is the querier so we will only know to drop | |
309 | * from v3 to v2 if the node that is the querier is also the one that is | |
310 | * running igmp v2. If a non-querier only supports igmp v2 we will have | |
311 | * no way of knowing. | |
312 | * | |
313 | * For now we will simplify things and inform the user that they need to | |
314 | * configure all PIM routers to use the same version of IGMP. | |
315 | */ | |
316 | if (query_version != pim_ifp->igmp_version) { | |
317 | zlog_warn("Recv IGMP query v%d from %s on %s but we are using v%d, please " | |
318 | "configure all PIM routers on this subnet to use the same " | |
319 | "IGMP version", | |
320 | query_version, from_str, ifp->name, pim_ifp->igmp_version); | |
321 | return 0; | |
322 | } | |
323 | ||
12e41d03 | 324 | if (PIM_DEBUG_IGMP_PACKETS) { |
eaa54bdb | 325 | char group_str[INET_ADDRSTRLEN]; |
12e41d03 | 326 | pim_inet4_dump("<group?>", group_addr, group_str, sizeof(group_str)); |
b05b72e8 DW |
327 | zlog_debug("Recv IGMP query v%d from %s on %s for group %s", |
328 | query_version, from_str, ifp->name, group_str); | |
12e41d03 DL |
329 | } |
330 | ||
331 | /* | |
332 | RFC 3376: 6.6.2. Querier Election | |
333 | ||
334 | When a router receives a query with a lower IP address, it sets | |
335 | the Other-Querier-Present timer to Other Querier Present Interval | |
336 | and ceases to send queries on the network if it was the previously | |
337 | elected querier. | |
338 | */ | |
339 | if (ntohl(from.s_addr) < ntohl(igmp->ifaddr.s_addr)) { | |
b05b72e8 | 340 | |
12e41d03 | 341 | if (PIM_DEBUG_IGMP_TRACE) { |
eaa54bdb | 342 | char ifaddr_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
343 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str)); |
344 | zlog_debug("%s: local address %s (%u) lost querier election to %s (%u)", | |
345 | ifp->name, | |
346 | ifaddr_str, ntohl(igmp->ifaddr.s_addr), | |
347 | from_str, ntohl(from.s_addr)); | |
348 | } | |
349 | ||
350 | pim_igmp_other_querier_timer_on(igmp); | |
351 | } | |
352 | ||
b05b72e8 | 353 | /* IGMP version 3 is the only one where we process the RXed query */ |
12e41d03 | 354 | if (query_version == 3) { |
b05b72e8 | 355 | igmp_v3_recv_query(igmp, from_str, igmp_msg); |
12e41d03 DL |
356 | } |
357 | ||
12e41d03 DL |
358 | return 0; |
359 | } | |
360 | ||
361 | static void on_trace(const char *label, | |
362 | struct interface *ifp, struct in_addr from) | |
363 | { | |
364 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 365 | char from_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
366 | pim_inet4_dump("<from?>", from, from_str, sizeof(from_str)); |
367 | zlog_debug("%s: from %s on %s", | |
368 | label, from_str, ifp->name); | |
369 | } | |
370 | } | |
371 | ||
b05b72e8 DW |
372 | static int |
373 | igmp_v1_recv_report (struct igmp_sock *igmp, | |
374 | struct in_addr from, const char *from_str, | |
375 | char *igmp_msg, int igmp_msg_len) | |
12e41d03 DL |
376 | { |
377 | struct interface *ifp = igmp->interface; | |
378 | struct igmp_group *group; | |
379 | struct in_addr group_addr; | |
380 | ||
381 | on_trace(__PRETTY_FUNCTION__, igmp->interface, from); | |
382 | ||
383 | if (igmp_msg_len != IGMP_V12_MSG_SIZE) { | |
384 | zlog_warn("Recv IGMP report v1 from %s on %s: size=%d other than correct=%d", | |
385 | from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE); | |
386 | return -1; | |
387 | } | |
388 | ||
389 | if (PIM_DEBUG_IGMP_TRACE) { | |
390 | zlog_warn("%s %s: FIXME WRITEME", | |
391 | __FILE__, __PRETTY_FUNCTION__); | |
392 | } | |
393 | ||
12e41d03 DL |
394 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
395 | ||
396 | /* non-existant group is created as INCLUDE {empty} */ | |
915c13b3 | 397 | group = igmp_add_group_by_addr(igmp, group_addr); |
12e41d03 DL |
398 | if (!group) { |
399 | return -1; | |
400 | } | |
401 | ||
402 | group->last_igmp_v1_report_dsec = pim_time_monotonic_dsec(); | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
407 | int pim_igmp_packet(struct igmp_sock *igmp, char *buf, size_t len) | |
408 | { | |
409 | struct ip *ip_hdr; | |
410 | size_t ip_hlen; /* ip header length in bytes */ | |
411 | char *igmp_msg; | |
412 | int igmp_msg_len; | |
413 | int msg_type; | |
eaa54bdb DW |
414 | char from_str[INET_ADDRSTRLEN]; |
415 | char to_str[INET_ADDRSTRLEN]; | |
12e41d03 DL |
416 | |
417 | if (len < sizeof(*ip_hdr)) { | |
418 | zlog_warn("IGMP packet size=%zu shorter than minimum=%zu", | |
419 | len, sizeof(*ip_hdr)); | |
420 | return -1; | |
421 | } | |
422 | ||
423 | ip_hdr = (struct ip *) buf; | |
424 | ||
425 | pim_inet4_dump("<src?>", ip_hdr->ip_src, from_str , sizeof(from_str)); | |
426 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, to_str , sizeof(to_str)); | |
427 | ||
428 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ | |
429 | ||
430 | if (PIM_DEBUG_IGMP_PACKETS) { | |
431 | zlog_debug("Recv IP packet from %s to %s on %s: size=%zu ip_header_size=%zu ip_proto=%d", | |
432 | from_str, to_str, igmp->interface->name, len, ip_hlen, ip_hdr->ip_p); | |
433 | } | |
434 | ||
435 | if (ip_hdr->ip_p != PIM_IP_PROTO_IGMP) { | |
436 | zlog_warn("IP packet protocol=%d is not IGMP=%d", | |
437 | ip_hdr->ip_p, PIM_IP_PROTO_IGMP); | |
438 | return -1; | |
439 | } | |
440 | ||
441 | if (ip_hlen < PIM_IP_HEADER_MIN_LEN) { | |
442 | zlog_warn("IP packet header size=%zu shorter than minimum=%d", | |
443 | ip_hlen, PIM_IP_HEADER_MIN_LEN); | |
444 | return -1; | |
445 | } | |
446 | if (ip_hlen > PIM_IP_HEADER_MAX_LEN) { | |
447 | zlog_warn("IP packet header size=%zu greater than maximum=%d", | |
448 | ip_hlen, PIM_IP_HEADER_MAX_LEN); | |
449 | return -1; | |
450 | } | |
451 | ||
452 | igmp_msg = buf + ip_hlen; | |
453 | msg_type = *igmp_msg; | |
454 | igmp_msg_len = len - ip_hlen; | |
455 | ||
456 | if (PIM_DEBUG_IGMP_PACKETS) { | |
457 | zlog_debug("Recv IGMP packet from %s to %s on %s: ttl=%d msg_type=%d msg_size=%d", | |
458 | from_str, to_str, igmp->interface->name, ip_hdr->ip_ttl, msg_type, | |
459 | igmp_msg_len); | |
460 | } | |
461 | ||
462 | if (igmp_msg_len < PIM_IGMP_MIN_LEN) { | |
463 | zlog_warn("IGMP message size=%d shorter than minimum=%d", | |
464 | igmp_msg_len, PIM_IGMP_MIN_LEN); | |
465 | return -1; | |
466 | } | |
467 | ||
468 | switch (msg_type) { | |
469 | case PIM_IGMP_MEMBERSHIP_QUERY: | |
470 | { | |
471 | int max_resp_code = igmp_msg[1]; | |
472 | int query_version; | |
473 | ||
474 | /* | |
475 | RFC 3376: 7.1. Query Version Distinctions | |
476 | IGMPv1 Query: length = 8 octets AND Max Resp Code field is zero | |
477 | IGMPv2 Query: length = 8 octets AND Max Resp Code field is non-zero | |
478 | IGMPv3 Query: length >= 12 octets | |
479 | */ | |
480 | ||
481 | if (igmp_msg_len == 8) { | |
482 | query_version = max_resp_code ? 2 : 1; | |
483 | } | |
484 | else if (igmp_msg_len >= 12) { | |
485 | query_version = 3; | |
486 | } | |
487 | else { | |
488 | zlog_warn("Unknown IGMP query version"); | |
489 | return -1; | |
490 | } | |
491 | ||
b05b72e8 | 492 | return igmp_recv_query(igmp, query_version, max_resp_code, |
12e41d03 DL |
493 | ip_hdr->ip_src, from_str, |
494 | igmp_msg, igmp_msg_len); | |
495 | } | |
496 | ||
497 | case PIM_IGMP_V3_MEMBERSHIP_REPORT: | |
b05b72e8 DW |
498 | return igmp_v3_recv_report(igmp, ip_hdr->ip_src, from_str, |
499 | igmp_msg, igmp_msg_len); | |
12e41d03 DL |
500 | |
501 | case PIM_IGMP_V2_MEMBERSHIP_REPORT: | |
b05b72e8 DW |
502 | return igmp_v2_recv_report(igmp, ip_hdr->ip_src, from_str, |
503 | igmp_msg, igmp_msg_len); | |
12e41d03 DL |
504 | |
505 | case PIM_IGMP_V1_MEMBERSHIP_REPORT: | |
b05b72e8 DW |
506 | return igmp_v1_recv_report(igmp, ip_hdr->ip_src, from_str, |
507 | igmp_msg, igmp_msg_len); | |
12e41d03 DL |
508 | |
509 | case PIM_IGMP_V2_LEAVE_GROUP: | |
b05b72e8 DW |
510 | return igmp_v2_recv_leave(igmp, ip_hdr->ip_src, from_str, |
511 | igmp_msg, igmp_msg_len); | |
12e41d03 DL |
512 | } |
513 | ||
514 | zlog_warn("Ignoring unsupported IGMP message type: %d", msg_type); | |
515 | ||
516 | return -1; | |
517 | } | |
518 | ||
519 | static int pim_igmp_general_query(struct thread *t); | |
520 | ||
521 | void pim_igmp_general_query_on(struct igmp_sock *igmp) | |
522 | { | |
523 | struct pim_interface *pim_ifp; | |
524 | int startup_mode; | |
525 | int query_interval; | |
526 | ||
12e41d03 DL |
527 | /* |
528 | Since this socket is starting as querier, | |
529 | there should not exist a timer for other-querier-present. | |
530 | */ | |
531 | zassert(!igmp->t_other_querier_timer); | |
532 | pim_ifp = igmp->interface->info; | |
533 | zassert(pim_ifp); | |
534 | ||
535 | /* | |
536 | RFC 3376: 8.6. Startup Query Interval | |
537 | ||
538 | The Startup Query Interval is the interval between General Queries | |
539 | sent by a Querier on startup. Default: 1/4 the Query Interval. | |
8971ccb2 DS |
540 | The first one should be sent out immediately instead of 125/4 |
541 | seconds from now. | |
12e41d03 DL |
542 | */ |
543 | startup_mode = igmp->startup_query_count > 0; | |
544 | if (startup_mode) { | |
8971ccb2 DS |
545 | /* |
546 | * If this is the first time we are sending a query on a | |
547 | * newly configured igmp interface send it out in 1 second | |
548 | * just to give the entire world a tiny bit of time to settle | |
549 | * else the query interval is: | |
550 | * query_interval = pim_ifp->igmp_default_query_interval >> 2; | |
551 | */ | |
552 | if (igmp->startup_query_count == igmp->querier_robustness_variable) | |
553 | query_interval = 1; | |
554 | else | |
555 | query_interval = PIM_IGMP_SQI(pim_ifp->igmp_default_query_interval); | |
12e41d03 | 556 | |
8971ccb2 | 557 | --igmp->startup_query_count; |
12e41d03 DL |
558 | } |
559 | else { | |
560 | query_interval = igmp->querier_query_interval; | |
561 | } | |
562 | ||
563 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 564 | char ifaddr_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
565 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str)); |
566 | zlog_debug("Querier %s scheduling %d-second (%s) TIMER event for IGMP query on fd=%d", | |
567 | ifaddr_str, | |
568 | query_interval, | |
569 | startup_mode ? "startup" : "non-startup", | |
570 | igmp->fd); | |
571 | } | |
59ba0ac3 | 572 | igmp->t_igmp_query_timer = NULL; |
12e41d03 DL |
573 | THREAD_TIMER_ON(master, igmp->t_igmp_query_timer, |
574 | pim_igmp_general_query, | |
575 | igmp, query_interval); | |
576 | } | |
577 | ||
578 | void pim_igmp_general_query_off(struct igmp_sock *igmp) | |
579 | { | |
580 | zassert(igmp); | |
581 | ||
582 | if (PIM_DEBUG_IGMP_TRACE) { | |
583 | if (igmp->t_igmp_query_timer) { | |
eaa54bdb | 584 | char ifaddr_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
585 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str)); |
586 | zlog_debug("IGMP querier %s fd=%d cancelling query TIMER event on %s", | |
587 | ifaddr_str, igmp->fd, igmp->interface->name); | |
588 | } | |
589 | } | |
590 | THREAD_OFF(igmp->t_igmp_query_timer); | |
12e41d03 DL |
591 | } |
592 | ||
593 | /* Issue IGMP general query */ | |
594 | static int pim_igmp_general_query(struct thread *t) | |
595 | { | |
12e41d03 DL |
596 | struct igmp_sock *igmp; |
597 | struct in_addr dst_addr; | |
598 | struct in_addr group_addr; | |
599 | struct pim_interface *pim_ifp; | |
b05b72e8 | 600 | int query_buf_size; |
12e41d03 | 601 | |
12e41d03 DL |
602 | igmp = THREAD_ARG(t); |
603 | ||
12e41d03 DL |
604 | zassert(igmp->interface); |
605 | zassert(igmp->interface->info); | |
606 | ||
607 | pim_ifp = igmp->interface->info; | |
608 | ||
b05b72e8 DW |
609 | if (pim_ifp->igmp_version == 3) { |
610 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; | |
611 | } else { | |
612 | query_buf_size = IGMP_V12_MSG_SIZE; | |
613 | } | |
614 | ||
615 | char query_buf[query_buf_size]; | |
616 | ||
12e41d03 DL |
617 | /* |
618 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
619 | ||
620 | In IGMPv3, General Queries are sent with an IP destination address | |
621 | of 224.0.0.1, the all-systems multicast address. Group-Specific | |
622 | and Group-and-Source-Specific Queries are sent with an IP | |
623 | destination address equal to the multicast address of interest. | |
624 | */ | |
625 | ||
626 | dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); | |
627 | group_addr.s_addr = PIM_NET_INADDR_ANY; | |
628 | ||
629 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb DW |
630 | char querier_str[INET_ADDRSTRLEN]; |
631 | char dst_str[INET_ADDRSTRLEN]; | |
12e41d03 DL |
632 | pim_inet4_dump("<querier?>", igmp->ifaddr, querier_str, |
633 | sizeof(querier_str)); | |
634 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
635 | zlog_debug("Querier %s issuing IGMP general query to %s on %s", | |
636 | querier_str, dst_str, igmp->interface->name); | |
637 | } | |
638 | ||
b05b72e8 DW |
639 | igmp_send_query (pim_ifp->igmp_version, |
640 | 0 /* igmp_group */, | |
641 | igmp->fd, | |
642 | igmp->interface->name, | |
643 | query_buf, | |
644 | sizeof(query_buf), | |
645 | 0 /* num_sources */, | |
646 | dst_addr, | |
647 | group_addr, | |
648 | pim_ifp->igmp_query_max_response_time_dsec, | |
649 | 1 /* s_flag: always set for general queries */, | |
650 | igmp->querier_robustness_variable, | |
651 | igmp->querier_query_interval); | |
12e41d03 DL |
652 | |
653 | pim_igmp_general_query_on(igmp); | |
654 | ||
655 | return 0; | |
656 | } | |
657 | ||
12e41d03 DL |
658 | static void sock_close(struct igmp_sock *igmp) |
659 | { | |
660 | pim_igmp_other_querier_timer_off(igmp); | |
661 | pim_igmp_general_query_off(igmp); | |
662 | ||
d3a8a0f5 | 663 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { |
12e41d03 DL |
664 | if (igmp->t_igmp_read) { |
665 | zlog_debug("Cancelling READ event on IGMP socket %s fd=%d on interface %s", | |
666 | inet_ntoa(igmp->ifaddr), igmp->fd, | |
667 | igmp->interface->name); | |
668 | } | |
669 | } | |
670 | THREAD_OFF(igmp->t_igmp_read); | |
12e41d03 DL |
671 | |
672 | if (close(igmp->fd)) { | |
673 | zlog_err("Failure closing IGMP socket %s fd=%d on interface %s: errno=%d: %s", | |
674 | inet_ntoa(igmp->ifaddr), igmp->fd, igmp->interface->name, | |
675 | errno, safe_strerror(errno)); | |
676 | } | |
677 | ||
d3a8a0f5 | 678 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { |
12e41d03 DL |
679 | zlog_debug("Deleted IGMP socket %s fd=%d on interface %s", |
680 | inet_ntoa(igmp->ifaddr), igmp->fd, igmp->interface->name); | |
681 | } | |
682 | } | |
683 | ||
684 | void igmp_startup_mode_on(struct igmp_sock *igmp) | |
685 | { | |
686 | struct pim_interface *pim_ifp; | |
687 | ||
688 | pim_ifp = igmp->interface->info; | |
689 | ||
690 | /* | |
691 | RFC 3376: 8.7. Startup Query Count | |
692 | ||
693 | The Startup Query Count is the number of Queries sent out on | |
694 | startup, separated by the Startup Query Interval. Default: the | |
695 | Robustness Variable. | |
696 | */ | |
697 | igmp->startup_query_count = igmp->querier_robustness_variable; | |
698 | ||
699 | /* | |
700 | Since we're (re)starting, reset QQI to default Query Interval | |
701 | */ | |
702 | igmp->querier_query_interval = pim_ifp->igmp_default_query_interval; | |
703 | } | |
704 | ||
705 | static void igmp_group_free(struct igmp_group *group) | |
706 | { | |
12e41d03 DL |
707 | list_free(group->group_source_list); |
708 | ||
709 | XFREE(MTYPE_PIM_IGMP_GROUP, group); | |
710 | } | |
711 | ||
712 | static void igmp_group_delete(struct igmp_group *group) | |
713 | { | |
714 | struct listnode *src_node; | |
715 | struct listnode *src_nextnode; | |
716 | struct igmp_source *src; | |
717 | ||
718 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 719 | char group_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
720 | pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str)); |
721 | zlog_debug("Deleting IGMP group %s from socket %d interface %s", | |
722 | group_str, | |
723 | group->group_igmp_sock->fd, | |
724 | group->group_igmp_sock->interface->name); | |
725 | } | |
726 | ||
727 | for (ALL_LIST_ELEMENTS(group->group_source_list, src_node, src_nextnode, src)) { | |
728 | igmp_source_delete(src); | |
729 | } | |
730 | ||
731 | if (group->t_group_query_retransmit_timer) { | |
732 | THREAD_OFF(group->t_group_query_retransmit_timer); | |
12e41d03 DL |
733 | } |
734 | ||
735 | group_timer_off(group); | |
736 | listnode_delete(group->group_igmp_sock->igmp_group_list, group); | |
737 | igmp_group_free(group); | |
738 | } | |
739 | ||
740 | void igmp_group_delete_empty_include(struct igmp_group *group) | |
741 | { | |
742 | zassert(!group->group_filtermode_isexcl); | |
743 | zassert(!listcount(group->group_source_list)); | |
744 | ||
745 | igmp_group_delete(group); | |
746 | } | |
747 | ||
748 | void igmp_sock_free(struct igmp_sock *igmp) | |
749 | { | |
750 | zassert(!igmp->t_igmp_read); | |
751 | zassert(!igmp->t_igmp_query_timer); | |
752 | zassert(!igmp->t_other_querier_timer); | |
753 | zassert(igmp->igmp_group_list); | |
754 | zassert(!listcount(igmp->igmp_group_list)); | |
755 | ||
756 | list_free(igmp->igmp_group_list); | |
757 | ||
758 | XFREE(MTYPE_PIM_IGMP_SOCKET, igmp); | |
759 | } | |
760 | ||
761 | void igmp_sock_delete(struct igmp_sock *igmp) | |
762 | { | |
763 | struct pim_interface *pim_ifp; | |
764 | struct listnode *grp_node; | |
765 | struct listnode *grp_nextnode; | |
766 | struct igmp_group *grp; | |
767 | ||
768 | for (ALL_LIST_ELEMENTS(igmp->igmp_group_list, grp_node, grp_nextnode, grp)) { | |
769 | igmp_group_delete(grp); | |
770 | } | |
771 | ||
772 | sock_close(igmp); | |
773 | ||
774 | pim_ifp = igmp->interface->info; | |
775 | ||
776 | listnode_delete(pim_ifp->igmp_socket_list, igmp); | |
777 | ||
778 | igmp_sock_free(igmp); | |
779 | } | |
780 | ||
cb24fec4 DS |
781 | void |
782 | igmp_sock_delete_all (struct interface *ifp) | |
783 | { | |
784 | struct pim_interface *pim_ifp; | |
785 | struct listnode *igmp_node, *igmp_nextnode; | |
786 | struct igmp_sock *igmp; | |
787 | ||
788 | pim_ifp = ifp->info; | |
789 | ||
790 | for (ALL_LIST_ELEMENTS (pim_ifp->igmp_socket_list, igmp_node, | |
791 | igmp_nextnode, igmp)) | |
792 | { | |
793 | igmp_sock_delete(igmp); | |
794 | } | |
795 | } | |
796 | ||
12e41d03 DL |
797 | static struct igmp_sock *igmp_sock_new(int fd, |
798 | struct in_addr ifaddr, | |
799 | struct interface *ifp) | |
800 | { | |
801 | struct pim_interface *pim_ifp; | |
802 | struct igmp_sock *igmp; | |
803 | ||
804 | pim_ifp = ifp->info; | |
805 | ||
806 | if (PIM_DEBUG_IGMP_TRACE) { | |
807 | zlog_debug("Creating IGMP socket fd=%d for address %s on interface %s", | |
808 | fd, inet_ntoa(ifaddr), ifp->name); | |
809 | } | |
810 | ||
36d9e7dc | 811 | igmp = XCALLOC(MTYPE_PIM_IGMP_SOCKET, sizeof(*igmp)); |
12e41d03 | 812 | if (!igmp) { |
36d9e7dc | 813 | zlog_warn("%s %s: XCALLOC() failure", |
12e41d03 DL |
814 | __FILE__, __PRETTY_FUNCTION__); |
815 | return 0; | |
816 | } | |
817 | ||
818 | igmp->igmp_group_list = list_new(); | |
819 | if (!igmp->igmp_group_list) { | |
820 | zlog_err("%s %s: failure: igmp_group_list = list_new()", | |
821 | __FILE__, __PRETTY_FUNCTION__); | |
822 | return 0; | |
823 | } | |
824 | igmp->igmp_group_list->del = (void (*)(void *)) igmp_group_free; | |
825 | ||
826 | igmp->fd = fd; | |
827 | igmp->interface = ifp; | |
828 | igmp->ifaddr = ifaddr; | |
59ba0ac3 DS |
829 | igmp->t_igmp_read = NULL; |
830 | igmp->t_igmp_query_timer = NULL; | |
831 | igmp->t_other_querier_timer = NULL; /* no other querier present */ | |
12e41d03 DL |
832 | igmp->querier_robustness_variable = pim_ifp->igmp_default_robustness_variable; |
833 | igmp->sock_creation = pim_time_monotonic_sec(); | |
834 | ||
835 | /* | |
836 | igmp_startup_mode_on() will reset QQI: | |
837 | ||
838 | igmp->querier_query_interval = pim_ifp->igmp_default_query_interval; | |
839 | */ | |
840 | igmp_startup_mode_on(igmp); | |
12e41d03 DL |
841 | pim_igmp_general_query_on(igmp); |
842 | ||
843 | return igmp; | |
844 | } | |
845 | ||
7923d317 DS |
846 | static void igmp_read_on (struct igmp_sock *igmp); |
847 | ||
848 | static int | |
849 | pim_igmp_read (struct thread *t) | |
850 | { | |
851 | uint8_t buf[10000]; | |
852 | struct igmp_sock *igmp = (struct igmp_sock *)THREAD_ARG(t); | |
853 | struct sockaddr_in from; | |
854 | struct sockaddr_in to; | |
855 | socklen_t fromlen = sizeof(from); | |
856 | socklen_t tolen = sizeof(to); | |
857 | ifindex_t ifindex = -1; | |
858 | int cont = 1; | |
859 | int len; | |
860 | ||
861 | while (cont) | |
862 | { | |
863 | len = pim_socket_recvfromto(igmp->fd, buf, sizeof(buf), | |
864 | &from, &fromlen, | |
865 | &to, &tolen, | |
866 | &ifindex); | |
867 | if (len < 0) | |
868 | { | |
869 | if (errno == EINTR) | |
870 | continue; | |
871 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
872 | { | |
873 | cont = 0; | |
874 | break; | |
875 | } | |
876 | goto done; | |
877 | } | |
878 | } | |
879 | ||
880 | done: | |
881 | igmp_read_on(igmp); | |
882 | return 0; | |
883 | } | |
884 | ||
885 | static void | |
886 | igmp_read_on (struct igmp_sock *igmp) | |
887 | { | |
888 | ||
889 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { | |
890 | zlog_debug("Scheduling READ event on IGMP socket fd=%d", | |
891 | igmp->fd); | |
892 | } | |
893 | igmp->t_igmp_read = NULL; | |
894 | THREAD_READ_ON(master, igmp->t_igmp_read, pim_igmp_read, igmp, igmp->fd); | |
895 | ||
896 | } | |
897 | ||
12e41d03 DL |
898 | struct igmp_sock *pim_igmp_sock_add(struct list *igmp_sock_list, |
899 | struct in_addr ifaddr, | |
900 | struct interface *ifp) | |
901 | { | |
902 | struct pim_interface *pim_ifp; | |
903 | struct igmp_sock *igmp; | |
904 | int fd; | |
905 | ||
906 | pim_ifp = ifp->info; | |
907 | ||
908 | fd = igmp_sock_open(ifaddr, ifp->ifindex, pim_ifp->options); | |
909 | if (fd < 0) { | |
910 | zlog_warn("Could not open IGMP socket for %s on %s", | |
911 | inet_ntoa(ifaddr), ifp->name); | |
912 | return 0; | |
913 | } | |
914 | ||
915 | igmp = igmp_sock_new(fd, ifaddr, ifp); | |
916 | if (!igmp) { | |
917 | zlog_err("%s %s: igmp_sock_new() failure", | |
918 | __FILE__, __PRETTY_FUNCTION__); | |
919 | close(fd); | |
920 | return 0; | |
921 | } | |
922 | ||
7923d317 DS |
923 | igmp_read_on (igmp); |
924 | ||
12e41d03 DL |
925 | listnode_add(igmp_sock_list, igmp); |
926 | ||
927 | #ifdef IGMP_SOCK_DUMP | |
928 | igmp_sock_dump(igmp_sock_array); | |
929 | #endif | |
930 | ||
931 | return igmp; | |
932 | } | |
933 | ||
934 | /* | |
935 | RFC 3376: 6.5. Switching Router Filter-Modes | |
936 | ||
937 | When a router's filter-mode for a group is EXCLUDE and the group | |
938 | timer expires, the router filter-mode for the group transitions to | |
939 | INCLUDE. | |
940 | ||
941 | A router uses source records with running source timers as its state | |
942 | for the switch to a filter-mode of INCLUDE. If there are any source | |
943 | records with source timers greater than zero (i.e., requested to be | |
944 | forwarded), a router switches to filter-mode of INCLUDE using those | |
945 | source records. Source records whose timers are zero (from the | |
946 | previous EXCLUDE mode) are deleted. | |
947 | */ | |
948 | static int igmp_group_timer(struct thread *t) | |
949 | { | |
950 | struct igmp_group *group; | |
951 | ||
12e41d03 | 952 | group = THREAD_ARG(t); |
12e41d03 DL |
953 | |
954 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 955 | char group_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
956 | pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str)); |
957 | zlog_debug("%s: Timer for group %s on interface %s", | |
958 | __PRETTY_FUNCTION__, | |
959 | group_str, group->group_igmp_sock->interface->name); | |
960 | } | |
961 | ||
962 | zassert(group->group_filtermode_isexcl); | |
963 | ||
09c02cc3 | 964 | group->t_group_timer = NULL; |
12e41d03 DL |
965 | group->group_filtermode_isexcl = 0; |
966 | ||
967 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
968 | igmp_anysource_forward_stop(group); | |
969 | ||
970 | igmp_source_delete_expired(group->group_source_list); | |
971 | ||
972 | zassert(!group->t_group_timer); | |
973 | zassert(!group->group_filtermode_isexcl); | |
974 | ||
975 | /* | |
976 | RFC 3376: 6.2.2. Definition of Group Timers | |
977 | ||
978 | If there are no more source records for the group, delete group | |
979 | record. | |
980 | */ | |
981 | if (listcount(group->group_source_list) < 1) { | |
982 | igmp_group_delete_empty_include(group); | |
983 | } | |
984 | ||
985 | return 0; | |
986 | } | |
987 | ||
988 | static void group_timer_off(struct igmp_group *group) | |
989 | { | |
990 | if (!group->t_group_timer) | |
991 | return; | |
992 | ||
993 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 994 | char group_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
995 | pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str)); |
996 | zlog_debug("Cancelling TIMER event for group %s on %s", | |
997 | group_str, group->group_igmp_sock->interface->name); | |
998 | } | |
999 | ||
1000 | THREAD_OFF(group->t_group_timer); | |
1001 | zassert(!group->t_group_timer); | |
1002 | } | |
1003 | ||
1004 | void igmp_group_timer_on(struct igmp_group *group, | |
1005 | long interval_msec, const char *ifname) | |
1006 | { | |
1007 | group_timer_off(group); | |
1008 | ||
1009 | if (PIM_DEBUG_IGMP_EVENTS) { | |
eaa54bdb | 1010 | char group_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
1011 | pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str)); |
1012 | zlog_debug("Scheduling %ld.%03ld sec TIMER event for group %s on %s", | |
1013 | interval_msec / 1000, | |
1014 | interval_msec % 1000, | |
1015 | group_str, ifname); | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | RFC 3376: 6.2.2. Definition of Group Timers | |
1020 | ||
1021 | The group timer is only used when a group is in EXCLUDE mode and | |
1022 | it represents the time for the *filter-mode* of the group to | |
1023 | expire and switch to INCLUDE mode. | |
1024 | */ | |
1025 | zassert(group->group_filtermode_isexcl); | |
1026 | ||
1027 | THREAD_TIMER_MSEC_ON(master, group->t_group_timer, | |
1028 | igmp_group_timer, | |
1029 | group, interval_msec); | |
1030 | } | |
1031 | ||
5b1207f7 DS |
1032 | struct igmp_group * |
1033 | find_group_by_addr (struct igmp_sock *igmp, | |
1034 | struct in_addr group_addr) | |
12e41d03 DL |
1035 | { |
1036 | struct igmp_group *group; | |
1037 | struct listnode *node; | |
1038 | ||
1039 | for (ALL_LIST_ELEMENTS_RO(igmp->igmp_group_list, node, group)) | |
1040 | if (group_addr.s_addr == group->group_addr.s_addr) | |
1041 | return group; | |
1042 | ||
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | struct igmp_group *igmp_add_group_by_addr(struct igmp_sock *igmp, | |
915c13b3 | 1047 | struct in_addr group_addr) |
12e41d03 DL |
1048 | { |
1049 | struct igmp_group *group; | |
1050 | ||
1051 | group = find_group_by_addr(igmp, group_addr); | |
1052 | if (group) { | |
1053 | return group; | |
1054 | } | |
1055 | ||
b815998a DS |
1056 | if (!pim_is_group_224_4 (group_addr)) |
1057 | { | |
1058 | zlog_warn("%s: Group Specified is not part of 224.0.0.0/4", | |
1059 | __PRETTY_FUNCTION__); | |
1060 | return NULL; | |
1061 | } | |
1062 | ||
06d1c450 DS |
1063 | if (pim_is_group_224_0_0_0_24 (group_addr)) |
1064 | { | |
1065 | zlog_warn("%s: Group specified is part of 224.0.0.0/24", | |
1066 | __PRETTY_FUNCTION__); | |
1067 | return NULL; | |
1068 | } | |
12e41d03 DL |
1069 | /* |
1070 | Non-existant group is created as INCLUDE {empty}: | |
1071 | ||
1072 | RFC 3376 - 5.1. Action on Change of Interface State | |
1073 | ||
1074 | If no interface state existed for that multicast address before | |
1075 | the change (i.e., the change consisted of creating a new | |
1076 | per-interface record), or if no state exists after the change | |
1077 | (i.e., the change consisted of deleting a per-interface record), | |
1078 | then the "non-existent" state is considered to have a filter mode | |
1079 | of INCLUDE and an empty source list. | |
1080 | */ | |
1081 | ||
36d9e7dc | 1082 | group = XCALLOC(MTYPE_PIM_IGMP_GROUP, sizeof(*group)); |
12e41d03 | 1083 | if (!group) { |
36d9e7dc | 1084 | zlog_warn("%s %s: XCALLOC() failure", |
12e41d03 | 1085 | __FILE__, __PRETTY_FUNCTION__); |
b815998a | 1086 | return NULL; /* error, not found, could not create */ |
12e41d03 DL |
1087 | } |
1088 | ||
1089 | group->group_source_list = list_new(); | |
1090 | if (!group->group_source_list) { | |
1091 | zlog_warn("%s %s: list_new() failure", | |
1092 | __FILE__, __PRETTY_FUNCTION__); | |
1093 | XFREE(MTYPE_PIM_IGMP_GROUP, group); /* discard group */ | |
b815998a | 1094 | return NULL; /* error, not found, could not initialize */ |
12e41d03 DL |
1095 | } |
1096 | group->group_source_list->del = (void (*)(void *)) igmp_source_free; | |
1097 | ||
915c13b3 DS |
1098 | group->t_group_timer = NULL; |
1099 | group->t_group_query_retransmit_timer = NULL; | |
12e41d03 DL |
1100 | group->group_specific_query_retransmit_count = 0; |
1101 | group->group_addr = group_addr; | |
1102 | group->group_igmp_sock = igmp; | |
1103 | group->last_igmp_v1_report_dsec = -1; | |
1104 | group->last_igmp_v2_report_dsec = -1; | |
1105 | group->group_creation = pim_time_monotonic_sec(); | |
b05b72e8 | 1106 | group->igmp_version = IGMP_DEFAULT_VERSION; |
12e41d03 DL |
1107 | |
1108 | /* initialize new group as INCLUDE {empty} */ | |
1109 | group->group_filtermode_isexcl = 0; /* 0=INCLUDE, 1=EXCLUDE */ | |
1110 | ||
1111 | listnode_add(igmp->igmp_group_list, group); | |
1112 | ||
1113 | if (PIM_DEBUG_IGMP_TRACE) { | |
eaa54bdb | 1114 | char group_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
1115 | pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str)); |
1116 | zlog_debug("Creating new IGMP group %s on socket %d interface %s", | |
915c13b3 | 1117 | group_str, igmp->fd, igmp->interface->name); |
12e41d03 DL |
1118 | } |
1119 | ||
1120 | /* | |
1121 | RFC 3376: 6.2.2. Definition of Group Timers | |
1122 | ||
1123 | The group timer is only used when a group is in EXCLUDE mode and | |
1124 | it represents the time for the *filter-mode* of the group to | |
1125 | expire and switch to INCLUDE mode. | |
1126 | */ | |
1127 | zassert(!group->group_filtermode_isexcl); /* INCLUDE mode */ | |
1128 | zassert(!group->t_group_timer); /* group timer == 0 */ | |
1129 | ||
1130 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
1131 | igmp_anysource_forward_stop(group); | |
1132 | ||
1133 | return group; | |
1134 | } | |
b05b72e8 DW |
1135 | |
1136 | void | |
1137 | igmp_send_query (int igmp_version, | |
1138 | struct igmp_group *group, | |
1139 | int fd, | |
1140 | const char *ifname, | |
1141 | char *query_buf, | |
1142 | int query_buf_size, | |
1143 | int num_sources, | |
1144 | struct in_addr dst_addr, | |
1145 | struct in_addr group_addr, | |
1146 | int query_max_response_time_dsec, | |
1147 | uint8_t s_flag, | |
1148 | uint8_t querier_robustness_variable, | |
1149 | uint16_t querier_query_interval) | |
1150 | { | |
1151 | if (igmp_version == 3) { | |
1152 | igmp_v3_send_query (group, fd, ifname, query_buf, | |
1153 | query_buf_size, num_sources, | |
1154 | dst_addr, group_addr, | |
1155 | query_max_response_time_dsec, s_flag, | |
1156 | querier_robustness_variable, | |
1157 | querier_query_interval); | |
1158 | } else if (igmp_version == 2) { | |
1159 | igmp_v2_send_query (group, fd, ifname, query_buf, | |
1160 | dst_addr, group_addr, | |
1161 | query_max_response_time_dsec); | |
1162 | } | |
1163 | } |