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Commit | Line | Data |
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12e41d03 | 1 | /* |
896014f4 DL |
2 | * PIM for Quagga |
3 | * Copyright (C) 2008 Everton da Silva Marques | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; see the file COPYING; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | */ | |
12e41d03 DL |
19 | |
20 | #include <zebra.h> | |
21 | ||
22 | #include "memory.h" | |
74fb6c66 | 23 | #include "prefix.h" |
9df99407 | 24 | #include "if.h" |
6345a326 DS |
25 | #include "hash.h" |
26 | #include "jhash.h" | |
12e41d03 DL |
27 | |
28 | #include "pimd.h" | |
29 | #include "pim_igmp.h" | |
b05b72e8 | 30 | #include "pim_igmpv2.h" |
12e41d03 | 31 | #include "pim_igmpv3.h" |
4d9ad5dc | 32 | #include "pim_igmp_mtrace.h" |
12e41d03 DL |
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 | 41 | static void group_timer_off(struct igmp_group *group); |
a91ec03e | 42 | static int pim_igmp_general_query(struct thread *t); |
12e41d03 | 43 | |
b05b72e8 DW |
44 | /* This socket is used for TXing IGMP packets only, IGMP RX happens |
45 | * in pim_mroute_msg() | |
46 | */ | |
d62a17ae | 47 | static int igmp_sock_open(struct in_addr ifaddr, struct interface *ifp, |
48 | uint32_t pim_options) | |
12e41d03 | 49 | { |
d62a17ae | 50 | int fd; |
51 | int join = 0; | |
52 | struct in_addr group; | |
53 | ||
54 | fd = pim_socket_mcast(IPPROTO_IGMP, ifaddr, ifp, 1); | |
55 | ||
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, ifp->ifindex)) | |
62 | ++join; | |
63 | } else { | |
64 | zlog_warn( | |
65 | "%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s", | |
66 | __FILE__, __PRETTY_FUNCTION__, fd, | |
67 | inet_ntoa(ifaddr), PIM_ALL_ROUTERS, errno, | |
68 | safe_strerror(errno)); | |
69 | } | |
70 | } | |
71 | ||
72 | /* | |
73 | IGMP routers periodically send IGMP general queries to | |
74 | AllSystems=224.0.0.1 | |
75 | IGMP routers must receive general queries for querier election. | |
76 | */ | |
77 | if (inet_aton(PIM_ALL_SYSTEMS, &group)) { | |
78 | if (!pim_socket_join(fd, group, ifaddr, ifp->ifindex)) | |
79 | ++join; | |
80 | } else { | |
81 | zlog_warn( | |
82 | "%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s", | |
83 | __FILE__, __PRETTY_FUNCTION__, fd, inet_ntoa(ifaddr), | |
84 | PIM_ALL_SYSTEMS, errno, safe_strerror(errno)); | |
85 | } | |
86 | ||
87 | if (inet_aton(PIM_ALL_IGMP_ROUTERS, &group)) { | |
88 | if (!pim_socket_join(fd, group, ifaddr, ifp->ifindex)) { | |
89 | ++join; | |
90 | } | |
91 | } else { | |
92 | zlog_warn( | |
93 | "%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s", | |
94 | __FILE__, __PRETTY_FUNCTION__, fd, inet_ntoa(ifaddr), | |
95 | PIM_ALL_IGMP_ROUTERS, errno, safe_strerror(errno)); | |
96 | } | |
97 | ||
98 | if (!join) { | |
99 | zlog_err( | |
100 | "IGMP socket fd=%d could not join any group on interface address %s", | |
101 | fd, inet_ntoa(ifaddr)); | |
102 | close(fd); | |
103 | fd = -1; | |
104 | } | |
105 | ||
106 | return fd; | |
12e41d03 DL |
107 | } |
108 | ||
109 | #undef IGMP_SOCK_DUMP | |
110 | ||
111 | #ifdef IGMP_SOCK_DUMP | |
112 | static void igmp_sock_dump(array_t *igmp_sock_array) | |
113 | { | |
d62a17ae | 114 | int size = array_size(igmp_sock_array); |
115 | for (int i = 0; i < size; ++i) { | |
116 | ||
117 | struct igmp_sock *igmp = array_get(igmp_sock_array, i); | |
118 | ||
119 | zlog_debug("%s %s: [%d/%d] igmp_addr=%s fd=%d", __FILE__, | |
120 | __PRETTY_FUNCTION__, i, size, | |
121 | inet_ntoa(igmp->ifaddr), igmp->fd); | |
122 | } | |
12e41d03 DL |
123 | } |
124 | #endif | |
125 | ||
126 | struct igmp_sock *pim_igmp_sock_lookup_ifaddr(struct list *igmp_sock_list, | |
127 | struct in_addr ifaddr) | |
128 | { | |
d62a17ae | 129 | struct listnode *sock_node; |
130 | struct igmp_sock *igmp; | |
12e41d03 DL |
131 | |
132 | #ifdef IGMP_SOCK_DUMP | |
d62a17ae | 133 | igmp_sock_dump(igmp_sock_list); |
12e41d03 DL |
134 | #endif |
135 | ||
d62a17ae | 136 | for (ALL_LIST_ELEMENTS_RO(igmp_sock_list, sock_node, igmp)) |
137 | if (ifaddr.s_addr == igmp->ifaddr.s_addr) | |
138 | return igmp; | |
12e41d03 | 139 | |
d62a17ae | 140 | return 0; |
12e41d03 DL |
141 | } |
142 | ||
d62a17ae | 143 | struct igmp_sock *igmp_sock_lookup_by_fd(struct list *igmp_sock_list, int fd) |
12e41d03 | 144 | { |
d62a17ae | 145 | struct listnode *sock_node; |
146 | struct igmp_sock *igmp; | |
12e41d03 | 147 | |
d62a17ae | 148 | for (ALL_LIST_ELEMENTS_RO(igmp_sock_list, sock_node, igmp)) |
149 | if (fd == igmp->fd) | |
150 | return igmp; | |
12e41d03 | 151 | |
d62a17ae | 152 | return 0; |
12e41d03 DL |
153 | } |
154 | ||
155 | static int pim_igmp_other_querier_expire(struct thread *t) | |
156 | { | |
d62a17ae | 157 | struct igmp_sock *igmp; |
158 | ||
159 | igmp = THREAD_ARG(t); | |
160 | ||
161 | zassert(!igmp->t_igmp_query_timer); | |
162 | ||
163 | if (PIM_DEBUG_IGMP_TRACE) { | |
164 | char ifaddr_str[INET_ADDRSTRLEN]; | |
165 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
166 | sizeof(ifaddr_str)); | |
167 | zlog_debug("%s: Querier %s resuming", __PRETTY_FUNCTION__, | |
168 | ifaddr_str); | |
169 | } | |
170 | ||
171 | /* | |
172 | We are the current querier, then | |
173 | re-start sending general queries. | |
174 | RFC 2236 - sec 7 Other Querier | |
175 | present timer expired (Send General | |
176 | Query, Set Gen. Query. timer) | |
177 | */ | |
178 | pim_igmp_general_query(t); | |
179 | ||
180 | return 0; | |
12e41d03 DL |
181 | } |
182 | ||
183 | void pim_igmp_other_querier_timer_on(struct igmp_sock *igmp) | |
184 | { | |
d62a17ae | 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) { | |
201 | char ifaddr_str[INET_ADDRSTRLEN]; | |
202 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
203 | sizeof(ifaddr_str)); | |
204 | zlog_debug( | |
205 | "Querier %s resetting TIMER event for Other-Querier-Present", | |
206 | ifaddr_str); | |
207 | } | |
208 | THREAD_OFF(igmp->t_other_querier_timer); | |
209 | } else { | |
210 | /* | |
211 | We are the current querier, then stop sending general queries: | |
212 | igmp->t_igmp_query_timer = NULL; | |
213 | */ | |
214 | pim_igmp_general_query_off(igmp); | |
215 | } | |
216 | ||
217 | /* | |
218 | Since this socket is starting the other-querier-present timer, | |
219 | there should not be periodic query timer for this socket. | |
220 | */ | |
221 | zassert(!igmp->t_igmp_query_timer); | |
222 | ||
223 | /* | |
224 | RFC 3376: 8.5. Other Querier Present Interval | |
225 | ||
226 | The Other Querier Present Interval is the length of time that must | |
227 | pass before a multicast router decides that there is no longer | |
228 | another multicast router which should be the querier. This value | |
229 | MUST be ((the Robustness Variable) times (the Query Interval)) plus | |
230 | (one half of one Query Response Interval). | |
231 | ||
232 | other_querier_present_interval_msec = \ | |
233 | igmp->querier_robustness_variable * \ | |
234 | 1000 * igmp->querier_query_interval + \ | |
235 | 100 * (pim_ifp->query_max_response_time_dsec >> 1); | |
236 | */ | |
237 | other_querier_present_interval_msec = PIM_IGMP_OQPI_MSEC( | |
238 | igmp->querier_robustness_variable, igmp->querier_query_interval, | |
239 | pim_ifp->igmp_query_max_response_time_dsec); | |
240 | ||
241 | if (PIM_DEBUG_IGMP_TRACE) { | |
242 | char ifaddr_str[INET_ADDRSTRLEN]; | |
243 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
244 | sizeof(ifaddr_str)); | |
245 | zlog_debug( | |
246 | "Querier %s scheduling %ld.%03ld sec TIMER event for Other-Querier-Present", | |
247 | ifaddr_str, other_querier_present_interval_msec / 1000, | |
248 | other_querier_present_interval_msec % 1000); | |
249 | } | |
250 | ||
251 | thread_add_timer_msec(master, pim_igmp_other_querier_expire, igmp, | |
252 | other_querier_present_interval_msec, | |
253 | &igmp->t_other_querier_timer); | |
12e41d03 DL |
254 | } |
255 | ||
256 | void pim_igmp_other_querier_timer_off(struct igmp_sock *igmp) | |
257 | { | |
d62a17ae | 258 | zassert(igmp); |
259 | ||
260 | if (PIM_DEBUG_IGMP_TRACE) { | |
261 | if (igmp->t_other_querier_timer) { | |
262 | char ifaddr_str[INET_ADDRSTRLEN]; | |
263 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
264 | sizeof(ifaddr_str)); | |
265 | zlog_debug( | |
266 | "IGMP querier %s fd=%d cancelling other-querier-present TIMER event on %s", | |
267 | ifaddr_str, igmp->fd, igmp->interface->name); | |
268 | } | |
269 | } | |
270 | THREAD_OFF(igmp->t_other_querier_timer); | |
12e41d03 DL |
271 | } |
272 | ||
d62a17ae | 273 | static int igmp_recv_query(struct igmp_sock *igmp, int query_version, |
274 | int max_resp_code, struct in_addr from, | |
275 | const char *from_str, char *igmp_msg, | |
276 | int igmp_msg_len) | |
12e41d03 | 277 | { |
d62a17ae | 278 | struct interface *ifp; |
279 | struct pim_interface *pim_ifp; | |
280 | struct in_addr group_addr; | |
281 | uint16_t recv_checksum; | |
282 | uint16_t checksum; | |
283 | ||
f83f3966 MS |
284 | if (igmp->mtrace_only) |
285 | return 0; | |
286 | ||
d62a17ae | 287 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
288 | ||
289 | ifp = igmp->interface; | |
290 | pim_ifp = ifp->info; | |
291 | ||
292 | recv_checksum = *(uint16_t *)(igmp_msg + IGMP_CHECKSUM_OFFSET); | |
293 | ||
294 | /* for computing checksum */ | |
295 | *(uint16_t *)(igmp_msg + IGMP_CHECKSUM_OFFSET) = 0; | |
296 | ||
297 | checksum = in_cksum(igmp_msg, igmp_msg_len); | |
298 | if (checksum != recv_checksum) { | |
299 | zlog_warn( | |
300 | "Recv IGMP query v%d from %s on %s: checksum mismatch: received=%x computed=%x", | |
301 | query_version, from_str, ifp->name, recv_checksum, | |
302 | checksum); | |
303 | return -1; | |
304 | } | |
305 | ||
21313cbf MS |
306 | /* Collecting IGMP Rx stats */ |
307 | switch (query_version) { | |
308 | case 1: | |
309 | igmp->rx_stats.query_v1++; | |
310 | break; | |
311 | case 2: | |
312 | igmp->rx_stats.query_v2++; | |
313 | break; | |
314 | case 3: | |
315 | igmp->rx_stats.query_v3++; | |
316 | break; | |
317 | default: | |
318 | igmp->rx_stats.unsupported++; | |
319 | } | |
320 | ||
b0f525a8 QY |
321 | /* |
322 | * RFC 3376 defines some guidelines on operating in backwards | |
323 | * compatibility with older versions of IGMP but there are some gaps in | |
324 | * the logic: | |
d62a17ae | 325 | * |
326 | * - once we drop from say version 3 to version 2 we will never go back | |
b0f525a8 QY |
327 | * to version 3 even if the node that TXed an IGMP v2 query upgrades |
328 | * to v3 | |
d62a17ae | 329 | * |
330 | * - The node with the lowest IP is the querier so we will only know to | |
b0f525a8 QY |
331 | * drop from v3 to v2 if the node that is the querier is also the one |
332 | * that is running igmp v2. If a non-querier only supports igmp v2 | |
333 | * we will have no way of knowing. | |
d62a17ae | 334 | * |
335 | * For now we will simplify things and inform the user that they need to | |
336 | * configure all PIM routers to use the same version of IGMP. | |
337 | */ | |
338 | if (query_version != pim_ifp->igmp_version) { | |
339 | zlog_warn( | |
340 | "Recv IGMP query v%d from %s on %s but we are using v%d, please " | |
341 | "configure all PIM routers on this subnet to use the same " | |
342 | "IGMP version", | |
343 | query_version, from_str, ifp->name, | |
344 | pim_ifp->igmp_version); | |
345 | return 0; | |
346 | } | |
347 | ||
348 | if (PIM_DEBUG_IGMP_PACKETS) { | |
349 | char group_str[INET_ADDRSTRLEN]; | |
350 | pim_inet4_dump("<group?>", group_addr, group_str, | |
351 | sizeof(group_str)); | |
352 | zlog_debug("Recv IGMP query v%d from %s on %s for group %s", | |
353 | query_version, from_str, ifp->name, group_str); | |
354 | } | |
355 | ||
356 | /* | |
357 | RFC 3376: 6.6.2. Querier Election | |
358 | ||
359 | When a router receives a query with a lower IP address, it sets | |
360 | the Other-Querier-Present timer to Other Querier Present Interval | |
361 | and ceases to send queries on the network if it was the previously | |
362 | elected querier. | |
363 | */ | |
364 | if (ntohl(from.s_addr) < ntohl(igmp->ifaddr.s_addr)) { | |
365 | ||
366 | if (PIM_DEBUG_IGMP_TRACE) { | |
367 | char ifaddr_str[INET_ADDRSTRLEN]; | |
368 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
369 | sizeof(ifaddr_str)); | |
370 | zlog_debug( | |
371 | "%s: local address %s (%u) lost querier election to %s (%u)", | |
372 | ifp->name, ifaddr_str, | |
373 | ntohl(igmp->ifaddr.s_addr), from_str, | |
374 | ntohl(from.s_addr)); | |
375 | } | |
376 | ||
377 | pim_igmp_other_querier_timer_on(igmp); | |
378 | } | |
379 | ||
380 | /* IGMP version 3 is the only one where we process the RXed query */ | |
381 | if (query_version == 3) { | |
382 | igmp_v3_recv_query(igmp, from_str, igmp_msg); | |
383 | } | |
384 | ||
385 | return 0; | |
12e41d03 DL |
386 | } |
387 | ||
d62a17ae | 388 | static void on_trace(const char *label, struct interface *ifp, |
389 | struct in_addr from) | |
12e41d03 | 390 | { |
d62a17ae | 391 | if (PIM_DEBUG_IGMP_TRACE) { |
392 | char from_str[INET_ADDRSTRLEN]; | |
393 | pim_inet4_dump("<from?>", from, from_str, sizeof(from_str)); | |
394 | zlog_debug("%s: from %s on %s", label, from_str, ifp->name); | |
395 | } | |
12e41d03 DL |
396 | } |
397 | ||
d62a17ae | 398 | static int igmp_v1_recv_report(struct igmp_sock *igmp, struct in_addr from, |
399 | const char *from_str, char *igmp_msg, | |
400 | int igmp_msg_len) | |
12e41d03 | 401 | { |
d62a17ae | 402 | struct interface *ifp = igmp->interface; |
403 | struct igmp_group *group; | |
404 | struct in_addr group_addr; | |
12e41d03 | 405 | |
d62a17ae | 406 | on_trace(__PRETTY_FUNCTION__, igmp->interface, from); |
12e41d03 | 407 | |
f83f3966 MS |
408 | if (igmp->mtrace_only) |
409 | return 0; | |
410 | ||
d62a17ae | 411 | if (igmp_msg_len != IGMP_V12_MSG_SIZE) { |
412 | zlog_warn( | |
413 | "Recv IGMP report v1 from %s on %s: size=%d other than correct=%d", | |
414 | from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE); | |
415 | return -1; | |
416 | } | |
12e41d03 | 417 | |
21313cbf MS |
418 | /* Collecting IGMP Rx stats */ |
419 | igmp->rx_stats.report_v1++; | |
420 | ||
d62a17ae | 421 | if (PIM_DEBUG_IGMP_TRACE) { |
422 | zlog_warn("%s %s: FIXME WRITEME", __FILE__, | |
423 | __PRETTY_FUNCTION__); | |
424 | } | |
12e41d03 | 425 | |
d62a17ae | 426 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
12e41d03 | 427 | |
b0f525a8 QY |
428 | if (pim_is_group_filtered(ifp->info, &group_addr)) |
429 | return -1; | |
430 | ||
d62a17ae | 431 | /* non-existant group is created as INCLUDE {empty} */ |
432 | group = igmp_add_group_by_addr(igmp, group_addr); | |
433 | if (!group) { | |
434 | return -1; | |
435 | } | |
12e41d03 | 436 | |
d62a17ae | 437 | group->last_igmp_v1_report_dsec = pim_time_monotonic_dsec(); |
12e41d03 | 438 | |
d62a17ae | 439 | return 0; |
12e41d03 DL |
440 | } |
441 | ||
442 | int pim_igmp_packet(struct igmp_sock *igmp, char *buf, size_t len) | |
443 | { | |
d62a17ae | 444 | struct ip *ip_hdr; |
445 | size_t ip_hlen; /* ip header length in bytes */ | |
446 | char *igmp_msg; | |
447 | int igmp_msg_len; | |
448 | int msg_type; | |
449 | char from_str[INET_ADDRSTRLEN]; | |
450 | char to_str[INET_ADDRSTRLEN]; | |
451 | ||
452 | if (len < sizeof(*ip_hdr)) { | |
453 | zlog_warn("IGMP packet size=%zu shorter than minimum=%zu", len, | |
454 | sizeof(*ip_hdr)); | |
455 | return -1; | |
456 | } | |
457 | ||
458 | ip_hdr = (struct ip *)buf; | |
459 | ||
460 | pim_inet4_dump("<src?>", ip_hdr->ip_src, from_str, sizeof(from_str)); | |
461 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, to_str, sizeof(to_str)); | |
462 | ||
463 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ | |
12e41d03 | 464 | |
d62a17ae | 465 | if (PIM_DEBUG_IGMP_PACKETS) { |
466 | zlog_debug( | |
467 | "Recv IP packet from %s to %s on %s: size=%zu ip_header_size=%zu ip_proto=%d", | |
468 | from_str, to_str, igmp->interface->name, len, ip_hlen, | |
469 | ip_hdr->ip_p); | |
470 | } | |
471 | ||
472 | igmp_msg = buf + ip_hlen; | |
473 | msg_type = *igmp_msg; | |
474 | igmp_msg_len = len - ip_hlen; | |
475 | ||
476 | if (PIM_DEBUG_IGMP_PACKETS) { | |
477 | zlog_debug( | |
478 | "Recv IGMP packet from %s to %s on %s: ttl=%d msg_type=%d msg_size=%d", | |
479 | from_str, to_str, igmp->interface->name, ip_hdr->ip_ttl, | |
480 | msg_type, igmp_msg_len); | |
481 | } | |
12e41d03 | 482 | |
d62a17ae | 483 | if (igmp_msg_len < PIM_IGMP_MIN_LEN) { |
484 | zlog_warn("IGMP message size=%d shorter than minimum=%d", | |
485 | igmp_msg_len, PIM_IGMP_MIN_LEN); | |
486 | return -1; | |
487 | } | |
488 | ||
489 | switch (msg_type) { | |
490 | case PIM_IGMP_MEMBERSHIP_QUERY: { | |
491 | int max_resp_code = igmp_msg[1]; | |
492 | int query_version; | |
493 | ||
494 | /* | |
495 | RFC 3376: 7.1. Query Version Distinctions | |
496 | IGMPv1 Query: length = 8 octets AND Max Resp Code field is | |
497 | zero | |
498 | IGMPv2 Query: length = 8 octets AND Max Resp Code field is | |
499 | non-zero | |
500 | IGMPv3 Query: length >= 12 octets | |
501 | */ | |
502 | ||
503 | if (igmp_msg_len == 8) { | |
504 | query_version = max_resp_code ? 2 : 1; | |
505 | } else if (igmp_msg_len >= 12) { | |
506 | query_version = 3; | |
507 | } else { | |
508 | zlog_warn("Unknown IGMP query version"); | |
509 | return -1; | |
510 | } | |
511 | ||
512 | return igmp_recv_query(igmp, query_version, max_resp_code, | |
513 | ip_hdr->ip_src, from_str, igmp_msg, | |
514 | igmp_msg_len); | |
515 | } | |
12e41d03 | 516 | |
d62a17ae | 517 | case PIM_IGMP_V3_MEMBERSHIP_REPORT: |
518 | return igmp_v3_recv_report(igmp, ip_hdr->ip_src, from_str, | |
519 | igmp_msg, igmp_msg_len); | |
12e41d03 | 520 | |
d62a17ae | 521 | case PIM_IGMP_V2_MEMBERSHIP_REPORT: |
522 | return igmp_v2_recv_report(igmp, ip_hdr->ip_src, from_str, | |
523 | igmp_msg, igmp_msg_len); | |
12e41d03 | 524 | |
d62a17ae | 525 | case PIM_IGMP_V1_MEMBERSHIP_REPORT: |
526 | return igmp_v1_recv_report(igmp, ip_hdr->ip_src, from_str, | |
527 | igmp_msg, igmp_msg_len); | |
12e41d03 | 528 | |
d62a17ae | 529 | case PIM_IGMP_V2_LEAVE_GROUP: |
530 | return igmp_v2_recv_leave(igmp, ip_hdr->ip_src, from_str, | |
531 | igmp_msg, igmp_msg_len); | |
4d9ad5dc MS |
532 | |
533 | case PIM_IGMP_MTRACE_RESPONSE: | |
534 | return igmp_mtrace_recv_response(igmp, ip_hdr, ip_hdr->ip_src, | |
535 | from_str, igmp_msg, | |
536 | igmp_msg_len); | |
4d9ad5dc MS |
537 | case PIM_IGMP_MTRACE_QUERY_REQUEST: |
538 | return igmp_mtrace_recv_qry_req(igmp, ip_hdr, ip_hdr->ip_src, | |
539 | from_str, igmp_msg, | |
540 | igmp_msg_len); | |
d62a17ae | 541 | } |
12e41d03 | 542 | |
d62a17ae | 543 | zlog_warn("Ignoring unsupported IGMP message type: %d", msg_type); |
544 | ||
21313cbf MS |
545 | /* Collecting IGMP Rx stats */ |
546 | igmp->rx_stats.unsupported++; | |
547 | ||
d62a17ae | 548 | return -1; |
12e41d03 DL |
549 | } |
550 | ||
12e41d03 DL |
551 | void pim_igmp_general_query_on(struct igmp_sock *igmp) |
552 | { | |
d62a17ae | 553 | struct pim_interface *pim_ifp; |
554 | int startup_mode; | |
555 | int query_interval; | |
556 | ||
557 | /* | |
558 | Since this socket is starting as querier, | |
559 | there should not exist a timer for other-querier-present. | |
560 | */ | |
561 | zassert(!igmp->t_other_querier_timer); | |
562 | pim_ifp = igmp->interface->info; | |
563 | zassert(pim_ifp); | |
564 | ||
565 | /* | |
566 | RFC 3376: 8.6. Startup Query Interval | |
567 | ||
568 | The Startup Query Interval is the interval between General Queries | |
569 | sent by a Querier on startup. Default: 1/4 the Query Interval. | |
570 | The first one should be sent out immediately instead of 125/4 | |
571 | seconds from now. | |
572 | */ | |
573 | startup_mode = igmp->startup_query_count > 0; | |
574 | if (startup_mode) { | |
575 | /* | |
576 | * If this is the first time we are sending a query on a | |
577 | * newly configured igmp interface send it out in 1 second | |
578 | * just to give the entire world a tiny bit of time to settle | |
579 | * else the query interval is: | |
580 | * query_interval = pim_ifp->igmp_default_query_interval >> 2; | |
581 | */ | |
582 | if (igmp->startup_query_count | |
583 | == igmp->querier_robustness_variable) | |
584 | query_interval = 1; | |
585 | else | |
586 | query_interval = PIM_IGMP_SQI( | |
587 | pim_ifp->igmp_default_query_interval); | |
588 | ||
589 | --igmp->startup_query_count; | |
590 | } else { | |
591 | query_interval = igmp->querier_query_interval; | |
592 | } | |
593 | ||
594 | if (PIM_DEBUG_IGMP_TRACE) { | |
595 | char ifaddr_str[INET_ADDRSTRLEN]; | |
596 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
597 | sizeof(ifaddr_str)); | |
598 | zlog_debug( | |
599 | "Querier %s scheduling %d-second (%s) TIMER event for IGMP query on fd=%d", | |
600 | ifaddr_str, query_interval, | |
601 | startup_mode ? "startup" : "non-startup", igmp->fd); | |
602 | } | |
603 | igmp->t_igmp_query_timer = NULL; | |
604 | thread_add_timer(master, pim_igmp_general_query, igmp, query_interval, | |
605 | &igmp->t_igmp_query_timer); | |
12e41d03 DL |
606 | } |
607 | ||
608 | void pim_igmp_general_query_off(struct igmp_sock *igmp) | |
609 | { | |
d62a17ae | 610 | zassert(igmp); |
611 | ||
612 | if (PIM_DEBUG_IGMP_TRACE) { | |
613 | if (igmp->t_igmp_query_timer) { | |
614 | char ifaddr_str[INET_ADDRSTRLEN]; | |
615 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
616 | sizeof(ifaddr_str)); | |
617 | zlog_debug( | |
618 | "IGMP querier %s fd=%d cancelling query TIMER event on %s", | |
619 | ifaddr_str, igmp->fd, igmp->interface->name); | |
620 | } | |
621 | } | |
622 | THREAD_OFF(igmp->t_igmp_query_timer); | |
12e41d03 DL |
623 | } |
624 | ||
625 | /* Issue IGMP general query */ | |
626 | static int pim_igmp_general_query(struct thread *t) | |
627 | { | |
d62a17ae | 628 | struct igmp_sock *igmp; |
629 | struct in_addr dst_addr; | |
630 | struct in_addr group_addr; | |
631 | struct pim_interface *pim_ifp; | |
632 | int query_buf_size; | |
633 | ||
634 | igmp = THREAD_ARG(t); | |
635 | ||
636 | zassert(igmp->interface); | |
637 | zassert(igmp->interface->info); | |
638 | ||
639 | pim_ifp = igmp->interface->info; | |
640 | ||
641 | if (pim_ifp->igmp_version == 3) { | |
642 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; | |
643 | } else { | |
644 | query_buf_size = IGMP_V12_MSG_SIZE; | |
645 | } | |
646 | ||
647 | char query_buf[query_buf_size]; | |
648 | ||
649 | /* | |
650 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
651 | ||
652 | In IGMPv3, General Queries are sent with an IP destination address | |
653 | of 224.0.0.1, the all-systems multicast address. Group-Specific | |
654 | and Group-and-Source-Specific Queries are sent with an IP | |
655 | destination address equal to the multicast address of interest. | |
656 | */ | |
657 | ||
658 | dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); | |
659 | group_addr.s_addr = PIM_NET_INADDR_ANY; | |
660 | ||
661 | if (PIM_DEBUG_IGMP_TRACE) { | |
662 | char querier_str[INET_ADDRSTRLEN]; | |
663 | char dst_str[INET_ADDRSTRLEN]; | |
664 | pim_inet4_dump("<querier?>", igmp->ifaddr, querier_str, | |
665 | sizeof(querier_str)); | |
666 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
667 | zlog_debug("Querier %s issuing IGMP general query to %s on %s", | |
668 | querier_str, dst_str, igmp->interface->name); | |
669 | } | |
670 | ||
671 | igmp_send_query(pim_ifp->igmp_version, 0 /* igmp_group */, igmp->fd, | |
672 | igmp->interface->name, query_buf, sizeof(query_buf), | |
673 | 0 /* num_sources */, dst_addr, group_addr, | |
674 | pim_ifp->igmp_query_max_response_time_dsec, | |
675 | 1 /* s_flag: always set for general queries */, | |
676 | igmp->querier_robustness_variable, | |
677 | igmp->querier_query_interval); | |
678 | ||
679 | pim_igmp_general_query_on(igmp); | |
680 | ||
681 | return 0; | |
12e41d03 DL |
682 | } |
683 | ||
12e41d03 DL |
684 | static void sock_close(struct igmp_sock *igmp) |
685 | { | |
d62a17ae | 686 | pim_igmp_other_querier_timer_off(igmp); |
687 | pim_igmp_general_query_off(igmp); | |
688 | ||
689 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { | |
690 | if (igmp->t_igmp_read) { | |
691 | zlog_debug( | |
692 | "Cancelling READ event on IGMP socket %s fd=%d on interface %s", | |
693 | inet_ntoa(igmp->ifaddr), igmp->fd, | |
694 | igmp->interface->name); | |
695 | } | |
696 | } | |
697 | THREAD_OFF(igmp->t_igmp_read); | |
698 | ||
699 | if (close(igmp->fd)) { | |
700 | zlog_err( | |
701 | "Failure closing IGMP socket %s fd=%d on interface %s: errno=%d: %s", | |
702 | inet_ntoa(igmp->ifaddr), igmp->fd, | |
703 | igmp->interface->name, errno, safe_strerror(errno)); | |
704 | } | |
705 | ||
706 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { | |
707 | zlog_debug("Deleted IGMP socket %s fd=%d on interface %s", | |
708 | inet_ntoa(igmp->ifaddr), igmp->fd, | |
709 | igmp->interface->name); | |
710 | } | |
12e41d03 DL |
711 | } |
712 | ||
713 | void igmp_startup_mode_on(struct igmp_sock *igmp) | |
714 | { | |
d62a17ae | 715 | struct pim_interface *pim_ifp; |
12e41d03 | 716 | |
d62a17ae | 717 | pim_ifp = igmp->interface->info; |
12e41d03 | 718 | |
d62a17ae | 719 | /* |
720 | RFC 3376: 8.7. Startup Query Count | |
12e41d03 | 721 | |
d62a17ae | 722 | The Startup Query Count is the number of Queries sent out on |
723 | startup, separated by the Startup Query Interval. Default: the | |
724 | Robustness Variable. | |
725 | */ | |
726 | igmp->startup_query_count = igmp->querier_robustness_variable; | |
12e41d03 | 727 | |
d62a17ae | 728 | /* |
729 | Since we're (re)starting, reset QQI to default Query Interval | |
730 | */ | |
731 | igmp->querier_query_interval = pim_ifp->igmp_default_query_interval; | |
12e41d03 DL |
732 | } |
733 | ||
734 | static void igmp_group_free(struct igmp_group *group) | |
735 | { | |
affe9e99 | 736 | list_delete_and_null(&group->group_source_list); |
12e41d03 | 737 | |
d62a17ae | 738 | XFREE(MTYPE_PIM_IGMP_GROUP, group); |
12e41d03 DL |
739 | } |
740 | ||
741 | static void igmp_group_delete(struct igmp_group *group) | |
742 | { | |
d62a17ae | 743 | struct listnode *src_node; |
744 | struct listnode *src_nextnode; | |
745 | struct igmp_source *src; | |
746 | ||
747 | if (PIM_DEBUG_IGMP_TRACE) { | |
748 | char group_str[INET_ADDRSTRLEN]; | |
749 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
750 | sizeof(group_str)); | |
751 | zlog_debug("Deleting IGMP group %s from socket %d interface %s", | |
752 | group_str, group->group_igmp_sock->fd, | |
753 | group->group_igmp_sock->interface->name); | |
754 | } | |
755 | ||
756 | for (ALL_LIST_ELEMENTS(group->group_source_list, src_node, src_nextnode, | |
757 | src)) { | |
758 | igmp_source_delete(src); | |
759 | } | |
760 | ||
761 | if (group->t_group_query_retransmit_timer) { | |
762 | THREAD_OFF(group->t_group_query_retransmit_timer); | |
763 | } | |
764 | ||
765 | group_timer_off(group); | |
766 | listnode_delete(group->group_igmp_sock->igmp_group_list, group); | |
767 | hash_release(group->group_igmp_sock->igmp_group_hash, group); | |
768 | ||
769 | igmp_group_free(group); | |
12e41d03 DL |
770 | } |
771 | ||
772 | void igmp_group_delete_empty_include(struct igmp_group *group) | |
773 | { | |
d62a17ae | 774 | zassert(!group->group_filtermode_isexcl); |
775 | zassert(!listcount(group->group_source_list)); | |
12e41d03 | 776 | |
d62a17ae | 777 | igmp_group_delete(group); |
12e41d03 DL |
778 | } |
779 | ||
780 | void igmp_sock_free(struct igmp_sock *igmp) | |
781 | { | |
d62a17ae | 782 | zassert(!igmp->t_igmp_read); |
783 | zassert(!igmp->t_igmp_query_timer); | |
784 | zassert(!igmp->t_other_querier_timer); | |
785 | zassert(igmp->igmp_group_list); | |
786 | zassert(!listcount(igmp->igmp_group_list)); | |
12e41d03 | 787 | |
affe9e99 | 788 | list_delete_and_null(&igmp->igmp_group_list); |
d62a17ae | 789 | hash_free(igmp->igmp_group_hash); |
12e41d03 | 790 | |
d62a17ae | 791 | XFREE(MTYPE_PIM_IGMP_SOCKET, igmp); |
12e41d03 DL |
792 | } |
793 | ||
794 | void igmp_sock_delete(struct igmp_sock *igmp) | |
795 | { | |
d62a17ae | 796 | struct pim_interface *pim_ifp; |
797 | struct listnode *grp_node; | |
798 | struct listnode *grp_nextnode; | |
799 | struct igmp_group *grp; | |
800 | ||
801 | for (ALL_LIST_ELEMENTS(igmp->igmp_group_list, grp_node, grp_nextnode, | |
802 | grp)) { | |
803 | igmp_group_delete(grp); | |
804 | } | |
12e41d03 | 805 | |
d62a17ae | 806 | sock_close(igmp); |
12e41d03 | 807 | |
d62a17ae | 808 | pim_ifp = igmp->interface->info; |
12e41d03 | 809 | |
d62a17ae | 810 | listnode_delete(pim_ifp->igmp_socket_list, igmp); |
12e41d03 | 811 | |
d62a17ae | 812 | igmp_sock_free(igmp); |
12e41d03 DL |
813 | } |
814 | ||
d62a17ae | 815 | void igmp_sock_delete_all(struct interface *ifp) |
cb24fec4 | 816 | { |
d62a17ae | 817 | struct pim_interface *pim_ifp; |
818 | struct listnode *igmp_node, *igmp_nextnode; | |
819 | struct igmp_sock *igmp; | |
cb24fec4 | 820 | |
d62a17ae | 821 | pim_ifp = ifp->info; |
cb24fec4 | 822 | |
d62a17ae | 823 | for (ALL_LIST_ELEMENTS(pim_ifp->igmp_socket_list, igmp_node, |
824 | igmp_nextnode, igmp)) { | |
825 | igmp_sock_delete(igmp); | |
826 | } | |
cb24fec4 DS |
827 | } |
828 | ||
d62a17ae | 829 | static unsigned int igmp_group_hash_key(void *arg) |
6345a326 | 830 | { |
d62a17ae | 831 | struct igmp_group *group = (struct igmp_group *)arg; |
6345a326 | 832 | |
d62a17ae | 833 | return jhash_1word(group->group_addr.s_addr, 0); |
6345a326 DS |
834 | } |
835 | ||
d62a17ae | 836 | static int igmp_group_hash_equal(const void *arg1, const void *arg2) |
6345a326 | 837 | { |
d62a17ae | 838 | const struct igmp_group *g1 = (const struct igmp_group *)arg1; |
839 | const struct igmp_group *g2 = (const struct igmp_group *)arg2; | |
6345a326 | 840 | |
d62a17ae | 841 | if (g1->group_addr.s_addr == g2->group_addr.s_addr) |
842 | return 1; | |
6345a326 | 843 | |
d62a17ae | 844 | return 0; |
6345a326 DS |
845 | } |
846 | ||
d62a17ae | 847 | static struct igmp_sock *igmp_sock_new(int fd, struct in_addr ifaddr, |
f83f3966 | 848 | struct interface *ifp, int mtrace_only) |
12e41d03 | 849 | { |
d62a17ae | 850 | struct pim_interface *pim_ifp; |
851 | struct igmp_sock *igmp; | |
9fb302f4 | 852 | char hash_name[64]; |
d62a17ae | 853 | |
854 | pim_ifp = ifp->info; | |
855 | ||
856 | if (PIM_DEBUG_IGMP_TRACE) { | |
857 | zlog_debug( | |
858 | "Creating IGMP socket fd=%d for address %s on interface %s", | |
859 | fd, inet_ntoa(ifaddr), ifp->name); | |
860 | } | |
861 | ||
862 | igmp = XCALLOC(MTYPE_PIM_IGMP_SOCKET, sizeof(*igmp)); | |
d62a17ae | 863 | |
864 | igmp->igmp_group_list = list_new(); | |
d62a17ae | 865 | igmp->igmp_group_list->del = (void (*)(void *))igmp_group_free; |
866 | ||
9fb302f4 DS |
867 | snprintf(hash_name, 64, "IGMP %s hash", ifp->name); |
868 | igmp->igmp_group_hash = hash_create(igmp_group_hash_key, | |
996c9314 | 869 | igmp_group_hash_equal, hash_name); |
d62a17ae | 870 | |
871 | igmp->fd = fd; | |
872 | igmp->interface = ifp; | |
873 | igmp->ifaddr = ifaddr; | |
874 | igmp->t_igmp_read = NULL; | |
875 | igmp->t_igmp_query_timer = NULL; | |
876 | igmp->t_other_querier_timer = NULL; /* no other querier present */ | |
877 | igmp->querier_robustness_variable = | |
878 | pim_ifp->igmp_default_robustness_variable; | |
879 | igmp->sock_creation = pim_time_monotonic_sec(); | |
880 | ||
21313cbf MS |
881 | igmp_stats_init(&igmp->rx_stats); |
882 | ||
f83f3966 MS |
883 | if (mtrace_only) { |
884 | igmp->mtrace_only = mtrace_only; | |
885 | return igmp; | |
886 | } | |
887 | ||
888 | igmp->mtrace_only = false; | |
889 | ||
d62a17ae | 890 | /* |
891 | igmp_startup_mode_on() will reset QQI: | |
892 | ||
893 | igmp->querier_query_interval = pim_ifp->igmp_default_query_interval; | |
894 | */ | |
895 | igmp_startup_mode_on(igmp); | |
896 | pim_igmp_general_query_on(igmp); | |
897 | ||
898 | return igmp; | |
12e41d03 DL |
899 | } |
900 | ||
d62a17ae | 901 | static void igmp_read_on(struct igmp_sock *igmp); |
7923d317 | 902 | |
d62a17ae | 903 | static int pim_igmp_read(struct thread *t) |
7923d317 | 904 | { |
d62a17ae | 905 | uint8_t buf[10000]; |
906 | struct igmp_sock *igmp = (struct igmp_sock *)THREAD_ARG(t); | |
907 | struct sockaddr_in from; | |
908 | struct sockaddr_in to; | |
909 | socklen_t fromlen = sizeof(from); | |
910 | socklen_t tolen = sizeof(to); | |
911 | ifindex_t ifindex = -1; | |
d62a17ae | 912 | int len; |
913 | ||
2e1cc436 | 914 | while (1) { |
d62a17ae | 915 | len = pim_socket_recvfromto(igmp->fd, buf, sizeof(buf), &from, |
916 | &fromlen, &to, &tolen, &ifindex); | |
917 | if (len < 0) { | |
918 | if (errno == EINTR) | |
919 | continue; | |
920 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
921 | break; | |
922 | ||
923 | goto done; | |
924 | } | |
7923d317 | 925 | } |
7923d317 | 926 | |
d62a17ae | 927 | done: |
928 | igmp_read_on(igmp); | |
929 | return 0; | |
7923d317 DS |
930 | } |
931 | ||
d62a17ae | 932 | static void igmp_read_on(struct igmp_sock *igmp) |
7923d317 DS |
933 | { |
934 | ||
d62a17ae | 935 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { |
936 | zlog_debug("Scheduling READ event on IGMP socket fd=%d", | |
937 | igmp->fd); | |
938 | } | |
939 | igmp->t_igmp_read = NULL; | |
940 | thread_add_read(master, pim_igmp_read, igmp, igmp->fd, | |
941 | &igmp->t_igmp_read); | |
7923d317 DS |
942 | } |
943 | ||
12e41d03 DL |
944 | struct igmp_sock *pim_igmp_sock_add(struct list *igmp_sock_list, |
945 | struct in_addr ifaddr, | |
f83f3966 MS |
946 | struct interface *ifp, |
947 | bool mtrace_only) | |
12e41d03 | 948 | { |
d62a17ae | 949 | struct pim_interface *pim_ifp; |
950 | struct igmp_sock *igmp; | |
951 | int fd; | |
12e41d03 | 952 | |
d62a17ae | 953 | pim_ifp = ifp->info; |
12e41d03 | 954 | |
d62a17ae | 955 | fd = igmp_sock_open(ifaddr, ifp, pim_ifp->options); |
956 | if (fd < 0) { | |
957 | zlog_warn("Could not open IGMP socket for %s on %s", | |
958 | inet_ntoa(ifaddr), ifp->name); | |
959 | return 0; | |
960 | } | |
12e41d03 | 961 | |
f83f3966 | 962 | igmp = igmp_sock_new(fd, ifaddr, ifp, mtrace_only); |
d62a17ae | 963 | if (!igmp) { |
964 | zlog_err("%s %s: igmp_sock_new() failure", __FILE__, | |
965 | __PRETTY_FUNCTION__); | |
966 | close(fd); | |
967 | return 0; | |
968 | } | |
12e41d03 | 969 | |
d62a17ae | 970 | igmp_read_on(igmp); |
7923d317 | 971 | |
d62a17ae | 972 | listnode_add(igmp_sock_list, igmp); |
12e41d03 DL |
973 | |
974 | #ifdef IGMP_SOCK_DUMP | |
d62a17ae | 975 | igmp_sock_dump(igmp_sock_array); |
12e41d03 DL |
976 | #endif |
977 | ||
d62a17ae | 978 | return igmp; |
12e41d03 DL |
979 | } |
980 | ||
981 | /* | |
982 | RFC 3376: 6.5. Switching Router Filter-Modes | |
983 | ||
984 | When a router's filter-mode for a group is EXCLUDE and the group | |
985 | timer expires, the router filter-mode for the group transitions to | |
986 | INCLUDE. | |
987 | ||
988 | A router uses source records with running source timers as its state | |
989 | for the switch to a filter-mode of INCLUDE. If there are any source | |
990 | records with source timers greater than zero (i.e., requested to be | |
991 | forwarded), a router switches to filter-mode of INCLUDE using those | |
992 | source records. Source records whose timers are zero (from the | |
993 | previous EXCLUDE mode) are deleted. | |
994 | */ | |
995 | static int igmp_group_timer(struct thread *t) | |
996 | { | |
d62a17ae | 997 | struct igmp_group *group; |
12e41d03 | 998 | |
d62a17ae | 999 | group = THREAD_ARG(t); |
12e41d03 | 1000 | |
d62a17ae | 1001 | if (PIM_DEBUG_IGMP_TRACE) { |
1002 | char group_str[INET_ADDRSTRLEN]; | |
1003 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1004 | sizeof(group_str)); | |
1005 | zlog_debug("%s: Timer for group %s on interface %s", | |
1006 | __PRETTY_FUNCTION__, group_str, | |
1007 | group->group_igmp_sock->interface->name); | |
1008 | } | |
12e41d03 | 1009 | |
d62a17ae | 1010 | zassert(group->group_filtermode_isexcl); |
12e41d03 | 1011 | |
d62a17ae | 1012 | group->group_filtermode_isexcl = 0; |
12e41d03 | 1013 | |
d62a17ae | 1014 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ |
1015 | igmp_anysource_forward_stop(group); | |
12e41d03 | 1016 | |
d62a17ae | 1017 | igmp_source_delete_expired(group->group_source_list); |
12e41d03 | 1018 | |
d62a17ae | 1019 | zassert(!group->group_filtermode_isexcl); |
12e41d03 | 1020 | |
d62a17ae | 1021 | /* |
1022 | RFC 3376: 6.2.2. Definition of Group Timers | |
12e41d03 | 1023 | |
d62a17ae | 1024 | If there are no more source records for the group, delete group |
1025 | record. | |
1026 | */ | |
1027 | if (listcount(group->group_source_list) < 1) { | |
1028 | igmp_group_delete_empty_include(group); | |
1029 | } | |
12e41d03 | 1030 | |
d62a17ae | 1031 | return 0; |
12e41d03 DL |
1032 | } |
1033 | ||
1034 | static void group_timer_off(struct igmp_group *group) | |
1035 | { | |
d62a17ae | 1036 | if (!group->t_group_timer) |
1037 | return; | |
1038 | ||
1039 | if (PIM_DEBUG_IGMP_TRACE) { | |
1040 | char group_str[INET_ADDRSTRLEN]; | |
1041 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1042 | sizeof(group_str)); | |
1043 | zlog_debug("Cancelling TIMER event for group %s on %s", | |
1044 | group_str, group->group_igmp_sock->interface->name); | |
1045 | } | |
1046 | THREAD_OFF(group->t_group_timer); | |
12e41d03 DL |
1047 | } |
1048 | ||
d62a17ae | 1049 | void igmp_group_timer_on(struct igmp_group *group, long interval_msec, |
1050 | const char *ifname) | |
12e41d03 | 1051 | { |
d62a17ae | 1052 | group_timer_off(group); |
1053 | ||
1054 | if (PIM_DEBUG_IGMP_EVENTS) { | |
1055 | char group_str[INET_ADDRSTRLEN]; | |
1056 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1057 | sizeof(group_str)); | |
1058 | zlog_debug( | |
1059 | "Scheduling %ld.%03ld sec TIMER event for group %s on %s", | |
1060 | interval_msec / 1000, interval_msec % 1000, group_str, | |
1061 | ifname); | |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | RFC 3376: 6.2.2. Definition of Group Timers | |
1066 | ||
1067 | The group timer is only used when a group is in EXCLUDE mode and | |
1068 | it represents the time for the *filter-mode* of the group to | |
1069 | expire and switch to INCLUDE mode. | |
1070 | */ | |
1071 | zassert(group->group_filtermode_isexcl); | |
1072 | ||
1073 | thread_add_timer_msec(master, igmp_group_timer, group, interval_msec, | |
1074 | &group->t_group_timer); | |
12e41d03 DL |
1075 | } |
1076 | ||
d62a17ae | 1077 | struct igmp_group *find_group_by_addr(struct igmp_sock *igmp, |
1078 | struct in_addr group_addr) | |
12e41d03 | 1079 | { |
d62a17ae | 1080 | struct igmp_group lookup; |
12e41d03 | 1081 | |
d62a17ae | 1082 | lookup.group_addr.s_addr = group_addr.s_addr; |
12e41d03 | 1083 | |
d62a17ae | 1084 | return hash_lookup(igmp->igmp_group_hash, &lookup); |
12e41d03 DL |
1085 | } |
1086 | ||
1087 | struct igmp_group *igmp_add_group_by_addr(struct igmp_sock *igmp, | |
915c13b3 | 1088 | struct in_addr group_addr) |
12e41d03 | 1089 | { |
d62a17ae | 1090 | struct igmp_group *group; |
1091 | ||
1092 | group = find_group_by_addr(igmp, group_addr); | |
1093 | if (group) { | |
1094 | return group; | |
1095 | } | |
1096 | ||
1097 | if (!pim_is_group_224_4(group_addr)) { | |
1098 | zlog_warn("%s: Group Specified is not part of 224.0.0.0/4", | |
1099 | __PRETTY_FUNCTION__); | |
1100 | return NULL; | |
1101 | } | |
1102 | ||
1103 | if (pim_is_group_224_0_0_0_24(group_addr)) { | |
1104 | zlog_warn("%s: Group specified is part of 224.0.0.0/24", | |
1105 | __PRETTY_FUNCTION__); | |
1106 | return NULL; | |
1107 | } | |
1108 | /* | |
1109 | Non-existant group is created as INCLUDE {empty}: | |
1110 | ||
1111 | RFC 3376 - 5.1. Action on Change of Interface State | |
1112 | ||
1113 | If no interface state existed for that multicast address before | |
1114 | the change (i.e., the change consisted of creating a new | |
1115 | per-interface record), or if no state exists after the change | |
1116 | (i.e., the change consisted of deleting a per-interface record), | |
1117 | then the "non-existent" state is considered to have a filter mode | |
1118 | of INCLUDE and an empty source list. | |
1119 | */ | |
1120 | ||
1121 | group = XCALLOC(MTYPE_PIM_IGMP_GROUP, sizeof(*group)); | |
d62a17ae | 1122 | |
1123 | group->group_source_list = list_new(); | |
d62a17ae | 1124 | group->group_source_list->del = (void (*)(void *))igmp_source_free; |
1125 | ||
1126 | group->t_group_timer = NULL; | |
1127 | group->t_group_query_retransmit_timer = NULL; | |
1128 | group->group_specific_query_retransmit_count = 0; | |
1129 | group->group_addr = group_addr; | |
1130 | group->group_igmp_sock = igmp; | |
1131 | group->last_igmp_v1_report_dsec = -1; | |
1132 | group->last_igmp_v2_report_dsec = -1; | |
1133 | group->group_creation = pim_time_monotonic_sec(); | |
1134 | group->igmp_version = IGMP_DEFAULT_VERSION; | |
1135 | ||
1136 | /* initialize new group as INCLUDE {empty} */ | |
1137 | group->group_filtermode_isexcl = 0; /* 0=INCLUDE, 1=EXCLUDE */ | |
1138 | ||
1139 | listnode_add(igmp->igmp_group_list, group); | |
1140 | group = hash_get(igmp->igmp_group_hash, group, hash_alloc_intern); | |
1141 | ||
1142 | if (PIM_DEBUG_IGMP_TRACE) { | |
1143 | char group_str[INET_ADDRSTRLEN]; | |
1144 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1145 | sizeof(group_str)); | |
1146 | zlog_debug( | |
1147 | "Creating new IGMP group %s on socket %d interface %s", | |
1148 | group_str, igmp->fd, igmp->interface->name); | |
1149 | } | |
1150 | ||
1151 | /* | |
1152 | RFC 3376: 6.2.2. Definition of Group Timers | |
1153 | ||
1154 | The group timer is only used when a group is in EXCLUDE mode and | |
1155 | it represents the time for the *filter-mode* of the group to | |
1156 | expire and switch to INCLUDE mode. | |
1157 | */ | |
1158 | zassert(!group->group_filtermode_isexcl); /* INCLUDE mode */ | |
1159 | zassert(!group->t_group_timer); /* group timer == 0 */ | |
1160 | ||
1161 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
1162 | igmp_anysource_forward_stop(group); | |
1163 | ||
1164 | return group; | |
12e41d03 | 1165 | } |
b05b72e8 | 1166 | |
d62a17ae | 1167 | void igmp_send_query(int igmp_version, struct igmp_group *group, int fd, |
1168 | const char *ifname, char *query_buf, int query_buf_size, | |
1169 | int num_sources, struct in_addr dst_addr, | |
1170 | struct in_addr group_addr, | |
1171 | int query_max_response_time_dsec, uint8_t s_flag, | |
1172 | uint8_t querier_robustness_variable, | |
1173 | uint16_t querier_query_interval) | |
b05b72e8 | 1174 | { |
d62a17ae | 1175 | if (igmp_version == 3) { |
1176 | igmp_v3_send_query(group, fd, ifname, query_buf, query_buf_size, | |
1177 | num_sources, dst_addr, group_addr, | |
1178 | query_max_response_time_dsec, s_flag, | |
1179 | querier_robustness_variable, | |
1180 | querier_query_interval); | |
1181 | } else if (igmp_version == 2) { | |
1182 | igmp_v2_send_query(group, fd, ifname, query_buf, dst_addr, | |
1183 | group_addr, query_max_response_time_dsec); | |
1184 | } | |
b05b72e8 | 1185 | } |