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Commit | Line | Data |
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12e41d03 | 1 | /* |
896014f4 DL |
2 | * PIM for Quagga |
3 | * Copyright (C) 2008 Everton da Silva Marques | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; see the file COPYING; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | */ | |
12e41d03 DL |
19 | |
20 | #include <zebra.h> | |
21 | ||
22 | #include "memory.h" | |
74fb6c66 | 23 | #include "prefix.h" |
9df99407 | 24 | #include "if.h" |
6345a326 DS |
25 | #include "hash.h" |
26 | #include "jhash.h" | |
3613d898 | 27 | #include "lib_errors.h" |
12e41d03 DL |
28 | |
29 | #include "pimd.h" | |
30 | #include "pim_igmp.h" | |
b05b72e8 | 31 | #include "pim_igmpv2.h" |
12e41d03 | 32 | #include "pim_igmpv3.h" |
4d9ad5dc | 33 | #include "pim_igmp_mtrace.h" |
12e41d03 DL |
34 | #include "pim_iface.h" |
35 | #include "pim_sock.h" | |
36 | #include "pim_mroute.h" | |
37 | #include "pim_str.h" | |
38 | #include "pim_util.h" | |
39 | #include "pim_time.h" | |
40 | #include "pim_zebra.h" | |
41 | ||
12e41d03 | 42 | static void group_timer_off(struct igmp_group *group); |
a91ec03e | 43 | static int pim_igmp_general_query(struct thread *t); |
12e41d03 | 44 | |
b05b72e8 DW |
45 | /* This socket is used for TXing IGMP packets only, IGMP RX happens |
46 | * in pim_mroute_msg() | |
47 | */ | |
d62a17ae | 48 | static int igmp_sock_open(struct in_addr ifaddr, struct interface *ifp, |
49 | uint32_t pim_options) | |
12e41d03 | 50 | { |
d62a17ae | 51 | int fd; |
52 | int join = 0; | |
53 | struct in_addr group; | |
54 | ||
55 | fd = pim_socket_mcast(IPPROTO_IGMP, ifaddr, ifp, 1); | |
56 | ||
57 | if (fd < 0) | |
58 | return -1; | |
59 | ||
60 | if (PIM_IF_TEST_IGMP_LISTEN_ALLROUTERS(pim_options)) { | |
61 | if (inet_aton(PIM_ALL_ROUTERS, &group)) { | |
62 | if (!pim_socket_join(fd, group, ifaddr, ifp->ifindex)) | |
63 | ++join; | |
64 | } else { | |
65 | zlog_warn( | |
66 | "%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s", | |
67 | __FILE__, __PRETTY_FUNCTION__, fd, | |
68 | inet_ntoa(ifaddr), PIM_ALL_ROUTERS, errno, | |
69 | safe_strerror(errno)); | |
70 | } | |
71 | } | |
72 | ||
73 | /* | |
74 | IGMP routers periodically send IGMP general queries to | |
75 | AllSystems=224.0.0.1 | |
76 | IGMP routers must receive general queries for querier election. | |
77 | */ | |
78 | if (inet_aton(PIM_ALL_SYSTEMS, &group)) { | |
79 | if (!pim_socket_join(fd, group, ifaddr, ifp->ifindex)) | |
80 | ++join; | |
81 | } else { | |
82 | zlog_warn( | |
83 | "%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s", | |
84 | __FILE__, __PRETTY_FUNCTION__, fd, inet_ntoa(ifaddr), | |
85 | PIM_ALL_SYSTEMS, errno, safe_strerror(errno)); | |
86 | } | |
87 | ||
88 | if (inet_aton(PIM_ALL_IGMP_ROUTERS, &group)) { | |
89 | if (!pim_socket_join(fd, group, ifaddr, ifp->ifindex)) { | |
90 | ++join; | |
91 | } | |
92 | } else { | |
93 | zlog_warn( | |
94 | "%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s", | |
95 | __FILE__, __PRETTY_FUNCTION__, fd, inet_ntoa(ifaddr), | |
96 | PIM_ALL_IGMP_ROUTERS, errno, safe_strerror(errno)); | |
97 | } | |
98 | ||
99 | if (!join) { | |
3613d898 DS |
100 | zlog_ferr(LIB_ERR_SOCKET, |
101 | "IGMP socket fd=%d could not join any group on interface address %s", | |
102 | fd, inet_ntoa(ifaddr)); | |
d62a17ae | 103 | close(fd); |
104 | fd = -1; | |
105 | } | |
106 | ||
107 | return fd; | |
12e41d03 DL |
108 | } |
109 | ||
110 | #undef IGMP_SOCK_DUMP | |
111 | ||
112 | #ifdef IGMP_SOCK_DUMP | |
113 | static void igmp_sock_dump(array_t *igmp_sock_array) | |
114 | { | |
d62a17ae | 115 | int size = array_size(igmp_sock_array); |
116 | for (int i = 0; i < size; ++i) { | |
117 | ||
118 | struct igmp_sock *igmp = array_get(igmp_sock_array, i); | |
119 | ||
120 | zlog_debug("%s %s: [%d/%d] igmp_addr=%s fd=%d", __FILE__, | |
121 | __PRETTY_FUNCTION__, i, size, | |
122 | inet_ntoa(igmp->ifaddr), igmp->fd); | |
123 | } | |
12e41d03 DL |
124 | } |
125 | #endif | |
126 | ||
127 | struct igmp_sock *pim_igmp_sock_lookup_ifaddr(struct list *igmp_sock_list, | |
128 | struct in_addr ifaddr) | |
129 | { | |
d62a17ae | 130 | struct listnode *sock_node; |
131 | struct igmp_sock *igmp; | |
12e41d03 DL |
132 | |
133 | #ifdef IGMP_SOCK_DUMP | |
d62a17ae | 134 | igmp_sock_dump(igmp_sock_list); |
12e41d03 DL |
135 | #endif |
136 | ||
d62a17ae | 137 | for (ALL_LIST_ELEMENTS_RO(igmp_sock_list, sock_node, igmp)) |
138 | if (ifaddr.s_addr == igmp->ifaddr.s_addr) | |
139 | return igmp; | |
12e41d03 | 140 | |
d62a17ae | 141 | return 0; |
12e41d03 DL |
142 | } |
143 | ||
d62a17ae | 144 | struct igmp_sock *igmp_sock_lookup_by_fd(struct list *igmp_sock_list, int fd) |
12e41d03 | 145 | { |
d62a17ae | 146 | struct listnode *sock_node; |
147 | struct igmp_sock *igmp; | |
12e41d03 | 148 | |
d62a17ae | 149 | for (ALL_LIST_ELEMENTS_RO(igmp_sock_list, sock_node, igmp)) |
150 | if (fd == igmp->fd) | |
151 | return igmp; | |
12e41d03 | 152 | |
d62a17ae | 153 | return 0; |
12e41d03 DL |
154 | } |
155 | ||
156 | static int pim_igmp_other_querier_expire(struct thread *t) | |
157 | { | |
d62a17ae | 158 | struct igmp_sock *igmp; |
159 | ||
160 | igmp = THREAD_ARG(t); | |
161 | ||
162 | zassert(!igmp->t_igmp_query_timer); | |
163 | ||
164 | if (PIM_DEBUG_IGMP_TRACE) { | |
165 | char ifaddr_str[INET_ADDRSTRLEN]; | |
166 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
167 | sizeof(ifaddr_str)); | |
168 | zlog_debug("%s: Querier %s resuming", __PRETTY_FUNCTION__, | |
169 | ifaddr_str); | |
170 | } | |
171 | ||
172 | /* | |
173 | We are the current querier, then | |
174 | re-start sending general queries. | |
175 | RFC 2236 - sec 7 Other Querier | |
176 | present timer expired (Send General | |
177 | Query, Set Gen. Query. timer) | |
178 | */ | |
179 | pim_igmp_general_query(t); | |
180 | ||
181 | return 0; | |
12e41d03 DL |
182 | } |
183 | ||
184 | void pim_igmp_other_querier_timer_on(struct igmp_sock *igmp) | |
185 | { | |
d62a17ae | 186 | long other_querier_present_interval_msec; |
187 | struct pim_interface *pim_ifp; | |
188 | ||
189 | zassert(igmp); | |
190 | zassert(igmp->interface); | |
191 | zassert(igmp->interface->info); | |
192 | ||
193 | pim_ifp = igmp->interface->info; | |
194 | ||
195 | if (igmp->t_other_querier_timer) { | |
196 | /* | |
197 | There is other querier present already, | |
198 | then reset the other-querier-present timer. | |
199 | */ | |
200 | ||
201 | if (PIM_DEBUG_IGMP_TRACE) { | |
202 | char ifaddr_str[INET_ADDRSTRLEN]; | |
203 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
204 | sizeof(ifaddr_str)); | |
205 | zlog_debug( | |
206 | "Querier %s resetting TIMER event for Other-Querier-Present", | |
207 | ifaddr_str); | |
208 | } | |
209 | THREAD_OFF(igmp->t_other_querier_timer); | |
210 | } else { | |
211 | /* | |
212 | We are the current querier, then stop sending general queries: | |
213 | igmp->t_igmp_query_timer = NULL; | |
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 = PIM_IGMP_OQPI_MSEC( | |
239 | igmp->querier_robustness_variable, igmp->querier_query_interval, | |
240 | pim_ifp->igmp_query_max_response_time_dsec); | |
241 | ||
242 | if (PIM_DEBUG_IGMP_TRACE) { | |
243 | char ifaddr_str[INET_ADDRSTRLEN]; | |
244 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
245 | sizeof(ifaddr_str)); | |
246 | zlog_debug( | |
247 | "Querier %s scheduling %ld.%03ld sec TIMER event for Other-Querier-Present", | |
248 | ifaddr_str, other_querier_present_interval_msec / 1000, | |
249 | other_querier_present_interval_msec % 1000); | |
250 | } | |
251 | ||
252 | thread_add_timer_msec(master, pim_igmp_other_querier_expire, igmp, | |
253 | other_querier_present_interval_msec, | |
254 | &igmp->t_other_querier_timer); | |
12e41d03 DL |
255 | } |
256 | ||
257 | void pim_igmp_other_querier_timer_off(struct igmp_sock *igmp) | |
258 | { | |
d62a17ae | 259 | zassert(igmp); |
260 | ||
261 | if (PIM_DEBUG_IGMP_TRACE) { | |
262 | if (igmp->t_other_querier_timer) { | |
263 | char ifaddr_str[INET_ADDRSTRLEN]; | |
264 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
265 | sizeof(ifaddr_str)); | |
266 | zlog_debug( | |
267 | "IGMP querier %s fd=%d cancelling other-querier-present TIMER event on %s", | |
268 | ifaddr_str, igmp->fd, igmp->interface->name); | |
269 | } | |
270 | } | |
271 | THREAD_OFF(igmp->t_other_querier_timer); | |
12e41d03 DL |
272 | } |
273 | ||
d62a17ae | 274 | static int igmp_recv_query(struct igmp_sock *igmp, int query_version, |
275 | int max_resp_code, struct in_addr from, | |
276 | const char *from_str, char *igmp_msg, | |
277 | int igmp_msg_len) | |
12e41d03 | 278 | { |
d62a17ae | 279 | struct interface *ifp; |
280 | struct pim_interface *pim_ifp; | |
281 | struct in_addr group_addr; | |
282 | uint16_t recv_checksum; | |
283 | uint16_t checksum; | |
284 | ||
f83f3966 MS |
285 | if (igmp->mtrace_only) |
286 | return 0; | |
287 | ||
d62a17ae | 288 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
289 | ||
290 | ifp = igmp->interface; | |
291 | pim_ifp = ifp->info; | |
292 | ||
293 | recv_checksum = *(uint16_t *)(igmp_msg + IGMP_CHECKSUM_OFFSET); | |
294 | ||
295 | /* for computing checksum */ | |
296 | *(uint16_t *)(igmp_msg + IGMP_CHECKSUM_OFFSET) = 0; | |
297 | ||
298 | checksum = in_cksum(igmp_msg, igmp_msg_len); | |
299 | if (checksum != recv_checksum) { | |
300 | zlog_warn( | |
301 | "Recv IGMP query v%d from %s on %s: checksum mismatch: received=%x computed=%x", | |
302 | query_version, from_str, ifp->name, recv_checksum, | |
303 | checksum); | |
304 | return -1; | |
305 | } | |
306 | ||
21313cbf MS |
307 | /* Collecting IGMP Rx stats */ |
308 | switch (query_version) { | |
309 | case 1: | |
310 | igmp->rx_stats.query_v1++; | |
311 | break; | |
312 | case 2: | |
313 | igmp->rx_stats.query_v2++; | |
314 | break; | |
315 | case 3: | |
316 | igmp->rx_stats.query_v3++; | |
317 | break; | |
318 | default: | |
319 | igmp->rx_stats.unsupported++; | |
320 | } | |
321 | ||
b0f525a8 QY |
322 | /* |
323 | * RFC 3376 defines some guidelines on operating in backwards | |
324 | * compatibility with older versions of IGMP but there are some gaps in | |
325 | * the logic: | |
d62a17ae | 326 | * |
327 | * - once we drop from say version 3 to version 2 we will never go back | |
b0f525a8 QY |
328 | * to version 3 even if the node that TXed an IGMP v2 query upgrades |
329 | * to v3 | |
d62a17ae | 330 | * |
331 | * - The node with the lowest IP is the querier so we will only know to | |
b0f525a8 QY |
332 | * drop from v3 to v2 if the node that is the querier is also the one |
333 | * that is running igmp v2. If a non-querier only supports igmp v2 | |
334 | * we will have no way of knowing. | |
d62a17ae | 335 | * |
336 | * For now we will simplify things and inform the user that they need to | |
337 | * configure all PIM routers to use the same version of IGMP. | |
338 | */ | |
339 | if (query_version != pim_ifp->igmp_version) { | |
340 | zlog_warn( | |
341 | "Recv IGMP query v%d from %s on %s but we are using v%d, please " | |
342 | "configure all PIM routers on this subnet to use the same " | |
343 | "IGMP version", | |
344 | query_version, from_str, ifp->name, | |
345 | pim_ifp->igmp_version); | |
346 | return 0; | |
347 | } | |
348 | ||
349 | if (PIM_DEBUG_IGMP_PACKETS) { | |
350 | char group_str[INET_ADDRSTRLEN]; | |
351 | pim_inet4_dump("<group?>", group_addr, group_str, | |
352 | sizeof(group_str)); | |
353 | zlog_debug("Recv IGMP query v%d from %s on %s for group %s", | |
354 | query_version, from_str, ifp->name, group_str); | |
355 | } | |
356 | ||
357 | /* | |
358 | RFC 3376: 6.6.2. Querier Election | |
359 | ||
360 | When a router receives a query with a lower IP address, it sets | |
361 | the Other-Querier-Present timer to Other Querier Present Interval | |
362 | and ceases to send queries on the network if it was the previously | |
363 | elected querier. | |
364 | */ | |
365 | if (ntohl(from.s_addr) < ntohl(igmp->ifaddr.s_addr)) { | |
366 | ||
367 | if (PIM_DEBUG_IGMP_TRACE) { | |
368 | char ifaddr_str[INET_ADDRSTRLEN]; | |
369 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
370 | sizeof(ifaddr_str)); | |
371 | zlog_debug( | |
372 | "%s: local address %s (%u) lost querier election to %s (%u)", | |
373 | ifp->name, ifaddr_str, | |
374 | ntohl(igmp->ifaddr.s_addr), from_str, | |
375 | ntohl(from.s_addr)); | |
376 | } | |
377 | ||
378 | pim_igmp_other_querier_timer_on(igmp); | |
379 | } | |
380 | ||
381 | /* IGMP version 3 is the only one where we process the RXed query */ | |
382 | if (query_version == 3) { | |
383 | igmp_v3_recv_query(igmp, from_str, igmp_msg); | |
384 | } | |
385 | ||
386 | return 0; | |
12e41d03 DL |
387 | } |
388 | ||
d62a17ae | 389 | static void on_trace(const char *label, struct interface *ifp, |
390 | struct in_addr from) | |
12e41d03 | 391 | { |
d62a17ae | 392 | if (PIM_DEBUG_IGMP_TRACE) { |
393 | char from_str[INET_ADDRSTRLEN]; | |
394 | pim_inet4_dump("<from?>", from, from_str, sizeof(from_str)); | |
395 | zlog_debug("%s: from %s on %s", label, from_str, ifp->name); | |
396 | } | |
12e41d03 DL |
397 | } |
398 | ||
d62a17ae | 399 | static int igmp_v1_recv_report(struct igmp_sock *igmp, struct in_addr from, |
400 | const char *from_str, char *igmp_msg, | |
401 | int igmp_msg_len) | |
12e41d03 | 402 | { |
d62a17ae | 403 | struct interface *ifp = igmp->interface; |
404 | struct igmp_group *group; | |
405 | struct in_addr group_addr; | |
12e41d03 | 406 | |
d62a17ae | 407 | on_trace(__PRETTY_FUNCTION__, igmp->interface, from); |
12e41d03 | 408 | |
f83f3966 MS |
409 | if (igmp->mtrace_only) |
410 | return 0; | |
411 | ||
d62a17ae | 412 | if (igmp_msg_len != IGMP_V12_MSG_SIZE) { |
413 | zlog_warn( | |
414 | "Recv IGMP report v1 from %s on %s: size=%d other than correct=%d", | |
415 | from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE); | |
416 | return -1; | |
417 | } | |
12e41d03 | 418 | |
21313cbf MS |
419 | /* Collecting IGMP Rx stats */ |
420 | igmp->rx_stats.report_v1++; | |
421 | ||
d62a17ae | 422 | if (PIM_DEBUG_IGMP_TRACE) { |
423 | zlog_warn("%s %s: FIXME WRITEME", __FILE__, | |
424 | __PRETTY_FUNCTION__); | |
425 | } | |
12e41d03 | 426 | |
d62a17ae | 427 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
12e41d03 | 428 | |
b0f525a8 QY |
429 | if (pim_is_group_filtered(ifp->info, &group_addr)) |
430 | return -1; | |
431 | ||
d62a17ae | 432 | /* non-existant group is created as INCLUDE {empty} */ |
433 | group = igmp_add_group_by_addr(igmp, group_addr); | |
434 | if (!group) { | |
435 | return -1; | |
436 | } | |
12e41d03 | 437 | |
d62a17ae | 438 | group->last_igmp_v1_report_dsec = pim_time_monotonic_dsec(); |
12e41d03 | 439 | |
d62a17ae | 440 | return 0; |
12e41d03 DL |
441 | } |
442 | ||
443 | int pim_igmp_packet(struct igmp_sock *igmp, char *buf, size_t len) | |
444 | { | |
d62a17ae | 445 | struct ip *ip_hdr; |
446 | size_t ip_hlen; /* ip header length in bytes */ | |
447 | char *igmp_msg; | |
448 | int igmp_msg_len; | |
449 | int msg_type; | |
450 | char from_str[INET_ADDRSTRLEN]; | |
451 | char to_str[INET_ADDRSTRLEN]; | |
452 | ||
453 | if (len < sizeof(*ip_hdr)) { | |
454 | zlog_warn("IGMP packet size=%zu shorter than minimum=%zu", len, | |
455 | sizeof(*ip_hdr)); | |
456 | return -1; | |
457 | } | |
458 | ||
459 | ip_hdr = (struct ip *)buf; | |
460 | ||
461 | pim_inet4_dump("<src?>", ip_hdr->ip_src, from_str, sizeof(from_str)); | |
462 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, to_str, sizeof(to_str)); | |
463 | ||
464 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ | |
12e41d03 | 465 | |
d62a17ae | 466 | if (PIM_DEBUG_IGMP_PACKETS) { |
467 | zlog_debug( | |
468 | "Recv IP packet from %s to %s on %s: size=%zu ip_header_size=%zu ip_proto=%d", | |
469 | from_str, to_str, igmp->interface->name, len, ip_hlen, | |
470 | ip_hdr->ip_p); | |
471 | } | |
472 | ||
473 | igmp_msg = buf + ip_hlen; | |
474 | msg_type = *igmp_msg; | |
475 | igmp_msg_len = len - ip_hlen; | |
476 | ||
477 | if (PIM_DEBUG_IGMP_PACKETS) { | |
478 | zlog_debug( | |
479 | "Recv IGMP packet from %s to %s on %s: ttl=%d msg_type=%d msg_size=%d", | |
480 | from_str, to_str, igmp->interface->name, ip_hdr->ip_ttl, | |
481 | msg_type, igmp_msg_len); | |
482 | } | |
12e41d03 | 483 | |
d62a17ae | 484 | if (igmp_msg_len < PIM_IGMP_MIN_LEN) { |
485 | zlog_warn("IGMP message size=%d shorter than minimum=%d", | |
486 | igmp_msg_len, PIM_IGMP_MIN_LEN); | |
487 | return -1; | |
488 | } | |
489 | ||
490 | switch (msg_type) { | |
491 | case PIM_IGMP_MEMBERSHIP_QUERY: { | |
492 | int max_resp_code = igmp_msg[1]; | |
493 | int query_version; | |
494 | ||
495 | /* | |
496 | RFC 3376: 7.1. Query Version Distinctions | |
497 | IGMPv1 Query: length = 8 octets AND Max Resp Code field is | |
498 | zero | |
499 | IGMPv2 Query: length = 8 octets AND Max Resp Code field is | |
500 | non-zero | |
501 | IGMPv3 Query: length >= 12 octets | |
502 | */ | |
503 | ||
504 | if (igmp_msg_len == 8) { | |
505 | query_version = max_resp_code ? 2 : 1; | |
506 | } else if (igmp_msg_len >= 12) { | |
507 | query_version = 3; | |
508 | } else { | |
509 | zlog_warn("Unknown IGMP query version"); | |
510 | return -1; | |
511 | } | |
512 | ||
513 | return igmp_recv_query(igmp, query_version, max_resp_code, | |
514 | ip_hdr->ip_src, from_str, igmp_msg, | |
515 | igmp_msg_len); | |
516 | } | |
12e41d03 | 517 | |
d62a17ae | 518 | case PIM_IGMP_V3_MEMBERSHIP_REPORT: |
519 | return igmp_v3_recv_report(igmp, ip_hdr->ip_src, from_str, | |
520 | igmp_msg, igmp_msg_len); | |
12e41d03 | 521 | |
d62a17ae | 522 | case PIM_IGMP_V2_MEMBERSHIP_REPORT: |
523 | return igmp_v2_recv_report(igmp, ip_hdr->ip_src, from_str, | |
524 | igmp_msg, igmp_msg_len); | |
12e41d03 | 525 | |
d62a17ae | 526 | case PIM_IGMP_V1_MEMBERSHIP_REPORT: |
527 | return igmp_v1_recv_report(igmp, ip_hdr->ip_src, from_str, | |
528 | igmp_msg, igmp_msg_len); | |
12e41d03 | 529 | |
d62a17ae | 530 | case PIM_IGMP_V2_LEAVE_GROUP: |
531 | return igmp_v2_recv_leave(igmp, ip_hdr->ip_src, from_str, | |
532 | igmp_msg, igmp_msg_len); | |
4d9ad5dc MS |
533 | |
534 | case PIM_IGMP_MTRACE_RESPONSE: | |
535 | return igmp_mtrace_recv_response(igmp, ip_hdr, ip_hdr->ip_src, | |
536 | from_str, igmp_msg, | |
537 | igmp_msg_len); | |
4d9ad5dc MS |
538 | case PIM_IGMP_MTRACE_QUERY_REQUEST: |
539 | return igmp_mtrace_recv_qry_req(igmp, ip_hdr, ip_hdr->ip_src, | |
540 | from_str, igmp_msg, | |
541 | igmp_msg_len); | |
d62a17ae | 542 | } |
12e41d03 | 543 | |
d62a17ae | 544 | zlog_warn("Ignoring unsupported IGMP message type: %d", msg_type); |
545 | ||
21313cbf MS |
546 | /* Collecting IGMP Rx stats */ |
547 | igmp->rx_stats.unsupported++; | |
548 | ||
d62a17ae | 549 | return -1; |
12e41d03 DL |
550 | } |
551 | ||
12e41d03 DL |
552 | void pim_igmp_general_query_on(struct igmp_sock *igmp) |
553 | { | |
d62a17ae | 554 | struct pim_interface *pim_ifp; |
555 | int startup_mode; | |
556 | int query_interval; | |
557 | ||
558 | /* | |
559 | Since this socket is starting as querier, | |
560 | there should not exist a timer for other-querier-present. | |
561 | */ | |
562 | zassert(!igmp->t_other_querier_timer); | |
563 | pim_ifp = igmp->interface->info; | |
564 | zassert(pim_ifp); | |
565 | ||
566 | /* | |
567 | RFC 3376: 8.6. Startup Query Interval | |
568 | ||
569 | The Startup Query Interval is the interval between General Queries | |
570 | sent by a Querier on startup. Default: 1/4 the Query Interval. | |
571 | The first one should be sent out immediately instead of 125/4 | |
572 | seconds from now. | |
573 | */ | |
574 | startup_mode = igmp->startup_query_count > 0; | |
575 | if (startup_mode) { | |
576 | /* | |
577 | * If this is the first time we are sending a query on a | |
578 | * newly configured igmp interface send it out in 1 second | |
579 | * just to give the entire world a tiny bit of time to settle | |
580 | * else the query interval is: | |
581 | * query_interval = pim_ifp->igmp_default_query_interval >> 2; | |
582 | */ | |
583 | if (igmp->startup_query_count | |
584 | == igmp->querier_robustness_variable) | |
585 | query_interval = 1; | |
586 | else | |
587 | query_interval = PIM_IGMP_SQI( | |
588 | pim_ifp->igmp_default_query_interval); | |
589 | ||
590 | --igmp->startup_query_count; | |
591 | } else { | |
592 | query_interval = igmp->querier_query_interval; | |
593 | } | |
594 | ||
595 | if (PIM_DEBUG_IGMP_TRACE) { | |
596 | char ifaddr_str[INET_ADDRSTRLEN]; | |
597 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
598 | sizeof(ifaddr_str)); | |
599 | zlog_debug( | |
600 | "Querier %s scheduling %d-second (%s) TIMER event for IGMP query on fd=%d", | |
601 | ifaddr_str, query_interval, | |
602 | startup_mode ? "startup" : "non-startup", igmp->fd); | |
603 | } | |
604 | igmp->t_igmp_query_timer = NULL; | |
605 | thread_add_timer(master, pim_igmp_general_query, igmp, query_interval, | |
606 | &igmp->t_igmp_query_timer); | |
12e41d03 DL |
607 | } |
608 | ||
609 | void pim_igmp_general_query_off(struct igmp_sock *igmp) | |
610 | { | |
d62a17ae | 611 | zassert(igmp); |
612 | ||
613 | if (PIM_DEBUG_IGMP_TRACE) { | |
614 | if (igmp->t_igmp_query_timer) { | |
615 | char ifaddr_str[INET_ADDRSTRLEN]; | |
616 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
617 | sizeof(ifaddr_str)); | |
618 | zlog_debug( | |
619 | "IGMP querier %s fd=%d cancelling query TIMER event on %s", | |
620 | ifaddr_str, igmp->fd, igmp->interface->name); | |
621 | } | |
622 | } | |
623 | THREAD_OFF(igmp->t_igmp_query_timer); | |
12e41d03 DL |
624 | } |
625 | ||
626 | /* Issue IGMP general query */ | |
627 | static int pim_igmp_general_query(struct thread *t) | |
628 | { | |
d62a17ae | 629 | struct igmp_sock *igmp; |
630 | struct in_addr dst_addr; | |
631 | struct in_addr group_addr; | |
632 | struct pim_interface *pim_ifp; | |
633 | int query_buf_size; | |
634 | ||
635 | igmp = THREAD_ARG(t); | |
636 | ||
637 | zassert(igmp->interface); | |
638 | zassert(igmp->interface->info); | |
639 | ||
640 | pim_ifp = igmp->interface->info; | |
641 | ||
642 | if (pim_ifp->igmp_version == 3) { | |
643 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; | |
644 | } else { | |
645 | query_buf_size = IGMP_V12_MSG_SIZE; | |
646 | } | |
647 | ||
648 | char query_buf[query_buf_size]; | |
649 | ||
650 | /* | |
651 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
652 | ||
653 | In IGMPv3, General Queries are sent with an IP destination address | |
654 | of 224.0.0.1, the all-systems multicast address. Group-Specific | |
655 | and Group-and-Source-Specific Queries are sent with an IP | |
656 | destination address equal to the multicast address of interest. | |
657 | */ | |
658 | ||
659 | dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); | |
660 | group_addr.s_addr = PIM_NET_INADDR_ANY; | |
661 | ||
662 | if (PIM_DEBUG_IGMP_TRACE) { | |
663 | char querier_str[INET_ADDRSTRLEN]; | |
664 | char dst_str[INET_ADDRSTRLEN]; | |
665 | pim_inet4_dump("<querier?>", igmp->ifaddr, querier_str, | |
666 | sizeof(querier_str)); | |
667 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
668 | zlog_debug("Querier %s issuing IGMP general query to %s on %s", | |
669 | querier_str, dst_str, igmp->interface->name); | |
670 | } | |
671 | ||
672 | igmp_send_query(pim_ifp->igmp_version, 0 /* igmp_group */, igmp->fd, | |
673 | igmp->interface->name, query_buf, sizeof(query_buf), | |
674 | 0 /* num_sources */, dst_addr, group_addr, | |
675 | pim_ifp->igmp_query_max_response_time_dsec, | |
676 | 1 /* s_flag: always set for general queries */, | |
677 | igmp->querier_robustness_variable, | |
678 | igmp->querier_query_interval); | |
679 | ||
680 | pim_igmp_general_query_on(igmp); | |
681 | ||
682 | return 0; | |
12e41d03 DL |
683 | } |
684 | ||
12e41d03 DL |
685 | static void sock_close(struct igmp_sock *igmp) |
686 | { | |
d62a17ae | 687 | pim_igmp_other_querier_timer_off(igmp); |
688 | pim_igmp_general_query_off(igmp); | |
689 | ||
690 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { | |
691 | if (igmp->t_igmp_read) { | |
692 | zlog_debug( | |
693 | "Cancelling READ event on IGMP socket %s fd=%d on interface %s", | |
694 | inet_ntoa(igmp->ifaddr), igmp->fd, | |
695 | igmp->interface->name); | |
696 | } | |
697 | } | |
698 | THREAD_OFF(igmp->t_igmp_read); | |
699 | ||
700 | if (close(igmp->fd)) { | |
3613d898 DS |
701 | zlog_ferr( |
702 | LIB_ERR_SOCKET, | |
d62a17ae | 703 | "Failure closing IGMP socket %s fd=%d on interface %s: errno=%d: %s", |
704 | inet_ntoa(igmp->ifaddr), igmp->fd, | |
705 | igmp->interface->name, errno, safe_strerror(errno)); | |
706 | } | |
707 | ||
708 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { | |
709 | zlog_debug("Deleted IGMP socket %s fd=%d on interface %s", | |
710 | inet_ntoa(igmp->ifaddr), igmp->fd, | |
711 | igmp->interface->name); | |
712 | } | |
12e41d03 DL |
713 | } |
714 | ||
715 | void igmp_startup_mode_on(struct igmp_sock *igmp) | |
716 | { | |
d62a17ae | 717 | struct pim_interface *pim_ifp; |
12e41d03 | 718 | |
d62a17ae | 719 | pim_ifp = igmp->interface->info; |
12e41d03 | 720 | |
d62a17ae | 721 | /* |
722 | RFC 3376: 8.7. Startup Query Count | |
12e41d03 | 723 | |
d62a17ae | 724 | The Startup Query Count is the number of Queries sent out on |
725 | startup, separated by the Startup Query Interval. Default: the | |
726 | Robustness Variable. | |
727 | */ | |
728 | igmp->startup_query_count = igmp->querier_robustness_variable; | |
12e41d03 | 729 | |
d62a17ae | 730 | /* |
731 | Since we're (re)starting, reset QQI to default Query Interval | |
732 | */ | |
733 | igmp->querier_query_interval = pim_ifp->igmp_default_query_interval; | |
12e41d03 DL |
734 | } |
735 | ||
736 | static void igmp_group_free(struct igmp_group *group) | |
737 | { | |
affe9e99 | 738 | list_delete_and_null(&group->group_source_list); |
12e41d03 | 739 | |
d62a17ae | 740 | XFREE(MTYPE_PIM_IGMP_GROUP, group); |
12e41d03 DL |
741 | } |
742 | ||
743 | static void igmp_group_delete(struct igmp_group *group) | |
744 | { | |
d62a17ae | 745 | struct listnode *src_node; |
746 | struct listnode *src_nextnode; | |
747 | struct igmp_source *src; | |
748 | ||
749 | if (PIM_DEBUG_IGMP_TRACE) { | |
750 | char group_str[INET_ADDRSTRLEN]; | |
751 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
752 | sizeof(group_str)); | |
753 | zlog_debug("Deleting IGMP group %s from socket %d interface %s", | |
754 | group_str, group->group_igmp_sock->fd, | |
755 | group->group_igmp_sock->interface->name); | |
756 | } | |
757 | ||
758 | for (ALL_LIST_ELEMENTS(group->group_source_list, src_node, src_nextnode, | |
759 | src)) { | |
760 | igmp_source_delete(src); | |
761 | } | |
762 | ||
763 | if (group->t_group_query_retransmit_timer) { | |
764 | THREAD_OFF(group->t_group_query_retransmit_timer); | |
765 | } | |
766 | ||
767 | group_timer_off(group); | |
768 | listnode_delete(group->group_igmp_sock->igmp_group_list, group); | |
769 | hash_release(group->group_igmp_sock->igmp_group_hash, group); | |
770 | ||
771 | igmp_group_free(group); | |
12e41d03 DL |
772 | } |
773 | ||
774 | void igmp_group_delete_empty_include(struct igmp_group *group) | |
775 | { | |
d62a17ae | 776 | zassert(!group->group_filtermode_isexcl); |
777 | zassert(!listcount(group->group_source_list)); | |
12e41d03 | 778 | |
d62a17ae | 779 | igmp_group_delete(group); |
12e41d03 DL |
780 | } |
781 | ||
782 | void igmp_sock_free(struct igmp_sock *igmp) | |
783 | { | |
d62a17ae | 784 | zassert(!igmp->t_igmp_read); |
785 | zassert(!igmp->t_igmp_query_timer); | |
786 | zassert(!igmp->t_other_querier_timer); | |
787 | zassert(igmp->igmp_group_list); | |
788 | zassert(!listcount(igmp->igmp_group_list)); | |
12e41d03 | 789 | |
affe9e99 | 790 | list_delete_and_null(&igmp->igmp_group_list); |
d62a17ae | 791 | hash_free(igmp->igmp_group_hash); |
12e41d03 | 792 | |
d62a17ae | 793 | XFREE(MTYPE_PIM_IGMP_SOCKET, igmp); |
12e41d03 DL |
794 | } |
795 | ||
796 | void igmp_sock_delete(struct igmp_sock *igmp) | |
797 | { | |
d62a17ae | 798 | struct pim_interface *pim_ifp; |
799 | struct listnode *grp_node; | |
800 | struct listnode *grp_nextnode; | |
801 | struct igmp_group *grp; | |
802 | ||
803 | for (ALL_LIST_ELEMENTS(igmp->igmp_group_list, grp_node, grp_nextnode, | |
804 | grp)) { | |
805 | igmp_group_delete(grp); | |
806 | } | |
12e41d03 | 807 | |
d62a17ae | 808 | sock_close(igmp); |
12e41d03 | 809 | |
d62a17ae | 810 | pim_ifp = igmp->interface->info; |
12e41d03 | 811 | |
d62a17ae | 812 | listnode_delete(pim_ifp->igmp_socket_list, igmp); |
12e41d03 | 813 | |
d62a17ae | 814 | igmp_sock_free(igmp); |
12e41d03 DL |
815 | } |
816 | ||
d62a17ae | 817 | void igmp_sock_delete_all(struct interface *ifp) |
cb24fec4 | 818 | { |
d62a17ae | 819 | struct pim_interface *pim_ifp; |
820 | struct listnode *igmp_node, *igmp_nextnode; | |
821 | struct igmp_sock *igmp; | |
cb24fec4 | 822 | |
d62a17ae | 823 | pim_ifp = ifp->info; |
cb24fec4 | 824 | |
d62a17ae | 825 | for (ALL_LIST_ELEMENTS(pim_ifp->igmp_socket_list, igmp_node, |
826 | igmp_nextnode, igmp)) { | |
827 | igmp_sock_delete(igmp); | |
828 | } | |
cb24fec4 DS |
829 | } |
830 | ||
d62a17ae | 831 | static unsigned int igmp_group_hash_key(void *arg) |
6345a326 | 832 | { |
d62a17ae | 833 | struct igmp_group *group = (struct igmp_group *)arg; |
6345a326 | 834 | |
d62a17ae | 835 | return jhash_1word(group->group_addr.s_addr, 0); |
6345a326 DS |
836 | } |
837 | ||
d62a17ae | 838 | static int igmp_group_hash_equal(const void *arg1, const void *arg2) |
6345a326 | 839 | { |
d62a17ae | 840 | const struct igmp_group *g1 = (const struct igmp_group *)arg1; |
841 | const struct igmp_group *g2 = (const struct igmp_group *)arg2; | |
6345a326 | 842 | |
d62a17ae | 843 | if (g1->group_addr.s_addr == g2->group_addr.s_addr) |
844 | return 1; | |
6345a326 | 845 | |
d62a17ae | 846 | return 0; |
6345a326 DS |
847 | } |
848 | ||
d62a17ae | 849 | static struct igmp_sock *igmp_sock_new(int fd, struct in_addr ifaddr, |
f83f3966 | 850 | struct interface *ifp, int mtrace_only) |
12e41d03 | 851 | { |
d62a17ae | 852 | struct pim_interface *pim_ifp; |
853 | struct igmp_sock *igmp; | |
9fb302f4 | 854 | char hash_name[64]; |
d62a17ae | 855 | |
856 | pim_ifp = ifp->info; | |
857 | ||
858 | if (PIM_DEBUG_IGMP_TRACE) { | |
859 | zlog_debug( | |
860 | "Creating IGMP socket fd=%d for address %s on interface %s", | |
861 | fd, inet_ntoa(ifaddr), ifp->name); | |
862 | } | |
863 | ||
864 | igmp = XCALLOC(MTYPE_PIM_IGMP_SOCKET, sizeof(*igmp)); | |
d62a17ae | 865 | |
866 | igmp->igmp_group_list = list_new(); | |
d62a17ae | 867 | igmp->igmp_group_list->del = (void (*)(void *))igmp_group_free; |
868 | ||
9fb302f4 DS |
869 | snprintf(hash_name, 64, "IGMP %s hash", ifp->name); |
870 | igmp->igmp_group_hash = hash_create(igmp_group_hash_key, | |
996c9314 | 871 | igmp_group_hash_equal, hash_name); |
d62a17ae | 872 | |
873 | igmp->fd = fd; | |
874 | igmp->interface = ifp; | |
875 | igmp->ifaddr = ifaddr; | |
876 | igmp->t_igmp_read = NULL; | |
877 | igmp->t_igmp_query_timer = NULL; | |
878 | igmp->t_other_querier_timer = NULL; /* no other querier present */ | |
879 | igmp->querier_robustness_variable = | |
880 | pim_ifp->igmp_default_robustness_variable; | |
881 | igmp->sock_creation = pim_time_monotonic_sec(); | |
882 | ||
21313cbf MS |
883 | igmp_stats_init(&igmp->rx_stats); |
884 | ||
f83f3966 MS |
885 | if (mtrace_only) { |
886 | igmp->mtrace_only = mtrace_only; | |
887 | return igmp; | |
888 | } | |
889 | ||
890 | igmp->mtrace_only = false; | |
891 | ||
d62a17ae | 892 | /* |
893 | igmp_startup_mode_on() will reset QQI: | |
894 | ||
895 | igmp->querier_query_interval = pim_ifp->igmp_default_query_interval; | |
896 | */ | |
897 | igmp_startup_mode_on(igmp); | |
898 | pim_igmp_general_query_on(igmp); | |
899 | ||
900 | return igmp; | |
12e41d03 DL |
901 | } |
902 | ||
d62a17ae | 903 | static void igmp_read_on(struct igmp_sock *igmp); |
7923d317 | 904 | |
d62a17ae | 905 | static int pim_igmp_read(struct thread *t) |
7923d317 | 906 | { |
d62a17ae | 907 | uint8_t buf[10000]; |
908 | struct igmp_sock *igmp = (struct igmp_sock *)THREAD_ARG(t); | |
909 | struct sockaddr_in from; | |
910 | struct sockaddr_in to; | |
911 | socklen_t fromlen = sizeof(from); | |
912 | socklen_t tolen = sizeof(to); | |
913 | ifindex_t ifindex = -1; | |
d62a17ae | 914 | int len; |
915 | ||
2e1cc436 | 916 | while (1) { |
d62a17ae | 917 | len = pim_socket_recvfromto(igmp->fd, buf, sizeof(buf), &from, |
918 | &fromlen, &to, &tolen, &ifindex); | |
919 | if (len < 0) { | |
920 | if (errno == EINTR) | |
921 | continue; | |
922 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
923 | break; | |
924 | ||
925 | goto done; | |
926 | } | |
7923d317 | 927 | } |
7923d317 | 928 | |
d62a17ae | 929 | done: |
930 | igmp_read_on(igmp); | |
931 | return 0; | |
7923d317 DS |
932 | } |
933 | ||
d62a17ae | 934 | static void igmp_read_on(struct igmp_sock *igmp) |
7923d317 DS |
935 | { |
936 | ||
d62a17ae | 937 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { |
938 | zlog_debug("Scheduling READ event on IGMP socket fd=%d", | |
939 | igmp->fd); | |
940 | } | |
941 | igmp->t_igmp_read = NULL; | |
942 | thread_add_read(master, pim_igmp_read, igmp, igmp->fd, | |
943 | &igmp->t_igmp_read); | |
7923d317 DS |
944 | } |
945 | ||
12e41d03 DL |
946 | struct igmp_sock *pim_igmp_sock_add(struct list *igmp_sock_list, |
947 | struct in_addr ifaddr, | |
f83f3966 MS |
948 | struct interface *ifp, |
949 | bool mtrace_only) | |
12e41d03 | 950 | { |
d62a17ae | 951 | struct pim_interface *pim_ifp; |
952 | struct igmp_sock *igmp; | |
953 | int fd; | |
12e41d03 | 954 | |
d62a17ae | 955 | pim_ifp = ifp->info; |
12e41d03 | 956 | |
d62a17ae | 957 | fd = igmp_sock_open(ifaddr, ifp, pim_ifp->options); |
958 | if (fd < 0) { | |
959 | zlog_warn("Could not open IGMP socket for %s on %s", | |
960 | inet_ntoa(ifaddr), ifp->name); | |
961 | return 0; | |
962 | } | |
12e41d03 | 963 | |
f83f3966 | 964 | igmp = igmp_sock_new(fd, ifaddr, ifp, mtrace_only); |
12e41d03 | 965 | |
d62a17ae | 966 | igmp_read_on(igmp); |
7923d317 | 967 | |
d62a17ae | 968 | listnode_add(igmp_sock_list, igmp); |
12e41d03 DL |
969 | |
970 | #ifdef IGMP_SOCK_DUMP | |
d62a17ae | 971 | igmp_sock_dump(igmp_sock_array); |
12e41d03 DL |
972 | #endif |
973 | ||
d62a17ae | 974 | return igmp; |
12e41d03 DL |
975 | } |
976 | ||
977 | /* | |
978 | RFC 3376: 6.5. Switching Router Filter-Modes | |
979 | ||
980 | When a router's filter-mode for a group is EXCLUDE and the group | |
981 | timer expires, the router filter-mode for the group transitions to | |
982 | INCLUDE. | |
983 | ||
984 | A router uses source records with running source timers as its state | |
985 | for the switch to a filter-mode of INCLUDE. If there are any source | |
986 | records with source timers greater than zero (i.e., requested to be | |
987 | forwarded), a router switches to filter-mode of INCLUDE using those | |
988 | source records. Source records whose timers are zero (from the | |
989 | previous EXCLUDE mode) are deleted. | |
990 | */ | |
991 | static int igmp_group_timer(struct thread *t) | |
992 | { | |
d62a17ae | 993 | struct igmp_group *group; |
12e41d03 | 994 | |
d62a17ae | 995 | group = THREAD_ARG(t); |
12e41d03 | 996 | |
d62a17ae | 997 | if (PIM_DEBUG_IGMP_TRACE) { |
998 | char group_str[INET_ADDRSTRLEN]; | |
999 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1000 | sizeof(group_str)); | |
1001 | zlog_debug("%s: Timer for group %s on interface %s", | |
1002 | __PRETTY_FUNCTION__, group_str, | |
1003 | group->group_igmp_sock->interface->name); | |
1004 | } | |
12e41d03 | 1005 | |
d62a17ae | 1006 | zassert(group->group_filtermode_isexcl); |
12e41d03 | 1007 | |
d62a17ae | 1008 | group->group_filtermode_isexcl = 0; |
12e41d03 | 1009 | |
d62a17ae | 1010 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ |
1011 | igmp_anysource_forward_stop(group); | |
12e41d03 | 1012 | |
d62a17ae | 1013 | igmp_source_delete_expired(group->group_source_list); |
12e41d03 | 1014 | |
d62a17ae | 1015 | zassert(!group->group_filtermode_isexcl); |
12e41d03 | 1016 | |
d62a17ae | 1017 | /* |
1018 | RFC 3376: 6.2.2. Definition of Group Timers | |
12e41d03 | 1019 | |
d62a17ae | 1020 | If there are no more source records for the group, delete group |
1021 | record. | |
1022 | */ | |
1023 | if (listcount(group->group_source_list) < 1) { | |
1024 | igmp_group_delete_empty_include(group); | |
1025 | } | |
12e41d03 | 1026 | |
d62a17ae | 1027 | return 0; |
12e41d03 DL |
1028 | } |
1029 | ||
1030 | static void group_timer_off(struct igmp_group *group) | |
1031 | { | |
d62a17ae | 1032 | if (!group->t_group_timer) |
1033 | return; | |
1034 | ||
1035 | if (PIM_DEBUG_IGMP_TRACE) { | |
1036 | char group_str[INET_ADDRSTRLEN]; | |
1037 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1038 | sizeof(group_str)); | |
1039 | zlog_debug("Cancelling TIMER event for group %s on %s", | |
1040 | group_str, group->group_igmp_sock->interface->name); | |
1041 | } | |
1042 | THREAD_OFF(group->t_group_timer); | |
12e41d03 DL |
1043 | } |
1044 | ||
d62a17ae | 1045 | void igmp_group_timer_on(struct igmp_group *group, long interval_msec, |
1046 | const char *ifname) | |
12e41d03 | 1047 | { |
d62a17ae | 1048 | group_timer_off(group); |
1049 | ||
1050 | if (PIM_DEBUG_IGMP_EVENTS) { | |
1051 | char group_str[INET_ADDRSTRLEN]; | |
1052 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1053 | sizeof(group_str)); | |
1054 | zlog_debug( | |
1055 | "Scheduling %ld.%03ld sec TIMER event for group %s on %s", | |
1056 | interval_msec / 1000, interval_msec % 1000, group_str, | |
1057 | ifname); | |
1058 | } | |
1059 | ||
1060 | /* | |
1061 | RFC 3376: 6.2.2. Definition of Group Timers | |
1062 | ||
1063 | The group timer is only used when a group is in EXCLUDE mode and | |
1064 | it represents the time for the *filter-mode* of the group to | |
1065 | expire and switch to INCLUDE mode. | |
1066 | */ | |
1067 | zassert(group->group_filtermode_isexcl); | |
1068 | ||
1069 | thread_add_timer_msec(master, igmp_group_timer, group, interval_msec, | |
1070 | &group->t_group_timer); | |
12e41d03 DL |
1071 | } |
1072 | ||
d62a17ae | 1073 | struct igmp_group *find_group_by_addr(struct igmp_sock *igmp, |
1074 | struct in_addr group_addr) | |
12e41d03 | 1075 | { |
d62a17ae | 1076 | struct igmp_group lookup; |
12e41d03 | 1077 | |
d62a17ae | 1078 | lookup.group_addr.s_addr = group_addr.s_addr; |
12e41d03 | 1079 | |
d62a17ae | 1080 | return hash_lookup(igmp->igmp_group_hash, &lookup); |
12e41d03 DL |
1081 | } |
1082 | ||
1083 | struct igmp_group *igmp_add_group_by_addr(struct igmp_sock *igmp, | |
915c13b3 | 1084 | struct in_addr group_addr) |
12e41d03 | 1085 | { |
d62a17ae | 1086 | struct igmp_group *group; |
1087 | ||
1088 | group = find_group_by_addr(igmp, group_addr); | |
1089 | if (group) { | |
1090 | return group; | |
1091 | } | |
1092 | ||
1093 | if (!pim_is_group_224_4(group_addr)) { | |
1094 | zlog_warn("%s: Group Specified is not part of 224.0.0.0/4", | |
1095 | __PRETTY_FUNCTION__); | |
1096 | return NULL; | |
1097 | } | |
1098 | ||
1099 | if (pim_is_group_224_0_0_0_24(group_addr)) { | |
1100 | zlog_warn("%s: Group specified is part of 224.0.0.0/24", | |
1101 | __PRETTY_FUNCTION__); | |
1102 | return NULL; | |
1103 | } | |
1104 | /* | |
1105 | Non-existant group is created as INCLUDE {empty}: | |
1106 | ||
1107 | RFC 3376 - 5.1. Action on Change of Interface State | |
1108 | ||
1109 | If no interface state existed for that multicast address before | |
1110 | the change (i.e., the change consisted of creating a new | |
1111 | per-interface record), or if no state exists after the change | |
1112 | (i.e., the change consisted of deleting a per-interface record), | |
1113 | then the "non-existent" state is considered to have a filter mode | |
1114 | of INCLUDE and an empty source list. | |
1115 | */ | |
1116 | ||
1117 | group = XCALLOC(MTYPE_PIM_IGMP_GROUP, sizeof(*group)); | |
d62a17ae | 1118 | |
1119 | group->group_source_list = list_new(); | |
d62a17ae | 1120 | group->group_source_list->del = (void (*)(void *))igmp_source_free; |
1121 | ||
1122 | group->t_group_timer = NULL; | |
1123 | group->t_group_query_retransmit_timer = NULL; | |
1124 | group->group_specific_query_retransmit_count = 0; | |
1125 | group->group_addr = group_addr; | |
1126 | group->group_igmp_sock = igmp; | |
1127 | group->last_igmp_v1_report_dsec = -1; | |
1128 | group->last_igmp_v2_report_dsec = -1; | |
1129 | group->group_creation = pim_time_monotonic_sec(); | |
1130 | group->igmp_version = IGMP_DEFAULT_VERSION; | |
1131 | ||
1132 | /* initialize new group as INCLUDE {empty} */ | |
1133 | group->group_filtermode_isexcl = 0; /* 0=INCLUDE, 1=EXCLUDE */ | |
1134 | ||
1135 | listnode_add(igmp->igmp_group_list, group); | |
1136 | group = hash_get(igmp->igmp_group_hash, group, hash_alloc_intern); | |
1137 | ||
1138 | if (PIM_DEBUG_IGMP_TRACE) { | |
1139 | char group_str[INET_ADDRSTRLEN]; | |
1140 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1141 | sizeof(group_str)); | |
1142 | zlog_debug( | |
1143 | "Creating new IGMP group %s on socket %d interface %s", | |
1144 | group_str, igmp->fd, igmp->interface->name); | |
1145 | } | |
1146 | ||
1147 | /* | |
1148 | RFC 3376: 6.2.2. Definition of Group Timers | |
1149 | ||
1150 | The group timer is only used when a group is in EXCLUDE mode and | |
1151 | it represents the time for the *filter-mode* of the group to | |
1152 | expire and switch to INCLUDE mode. | |
1153 | */ | |
1154 | zassert(!group->group_filtermode_isexcl); /* INCLUDE mode */ | |
1155 | zassert(!group->t_group_timer); /* group timer == 0 */ | |
1156 | ||
1157 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
1158 | igmp_anysource_forward_stop(group); | |
1159 | ||
1160 | return group; | |
12e41d03 | 1161 | } |
b05b72e8 | 1162 | |
d62a17ae | 1163 | void igmp_send_query(int igmp_version, struct igmp_group *group, int fd, |
1164 | const char *ifname, char *query_buf, int query_buf_size, | |
1165 | int num_sources, struct in_addr dst_addr, | |
1166 | struct in_addr group_addr, | |
1167 | int query_max_response_time_dsec, uint8_t s_flag, | |
1168 | uint8_t querier_robustness_variable, | |
1169 | uint16_t querier_query_interval) | |
b05b72e8 | 1170 | { |
d62a17ae | 1171 | if (igmp_version == 3) { |
1172 | igmp_v3_send_query(group, fd, ifname, query_buf, query_buf_size, | |
1173 | num_sources, dst_addr, group_addr, | |
1174 | query_max_response_time_dsec, s_flag, | |
1175 | querier_robustness_variable, | |
1176 | querier_query_interval); | |
1177 | } else if (igmp_version == 2) { | |
1178 | igmp_v2_send_query(group, fd, ifname, query_buf, dst_addr, | |
1179 | group_addr, query_max_response_time_dsec); | |
1180 | } | |
b05b72e8 | 1181 | } |