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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", | |
15569c58 DA |
67 | __FILE__, __func__, fd, inet_ntoa(ifaddr), |
68 | PIM_ALL_ROUTERS, errno, safe_strerror(errno)); | |
d62a17ae | 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", | |
15569c58 | 83 | __FILE__, __func__, fd, inet_ntoa(ifaddr), |
d62a17ae | 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", | |
15569c58 | 94 | __FILE__, __func__, fd, inet_ntoa(ifaddr), |
d62a17ae | 95 | PIM_ALL_IGMP_ROUTERS, errno, safe_strerror(errno)); |
96 | } | |
97 | ||
98 | if (!join) { | |
09c866e3 | 99 | flog_err_sys( |
450971aa | 100 | EC_LIB_SOCKET, |
09c866e3 QY |
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__, | |
15569c58 DA |
121 | __func__, i, size, inet_ntoa(igmp->ifaddr), |
122 | igmp->fd); | |
d62a17ae | 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 | |
d12f46fa | 141 | return NULL; |
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 | |
d12f46fa | 153 | return NULL; |
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)); | |
15569c58 | 168 | zlog_debug("%s: Querier %s resuming", __func__, ifaddr_str); |
d62a17ae | 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 | ||
36417fcc DS |
251 | thread_add_timer_msec(router->master, pim_igmp_other_querier_expire, |
252 | igmp, other_querier_present_interval_msec, | |
d62a17ae | 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 | ||
8890b440 DS |
306 | if (!pim_if_connected_to_source(ifp, from)) { |
307 | if (PIM_DEBUG_IGMP_PACKETS) | |
308 | zlog_debug("Recv IGMP query on interface: %s from a non-connected source: %s", | |
309 | ifp->name, from_str); | |
310 | return 0; | |
311 | } | |
312 | ||
bcdb04e6 | 313 | if (if_lookup_exact_address(&from, AF_INET, ifp->vrf_id)) { |
26a0f1e2 DS |
314 | if (PIM_DEBUG_IGMP_PACKETS) |
315 | zlog_debug("Recv IGMP query on interface: %s from ourself %s", | |
316 | ifp->name, from_str); | |
317 | return 0; | |
318 | } | |
319 | ||
21313cbf MS |
320 | /* Collecting IGMP Rx stats */ |
321 | switch (query_version) { | |
322 | case 1: | |
323 | igmp->rx_stats.query_v1++; | |
324 | break; | |
325 | case 2: | |
326 | igmp->rx_stats.query_v2++; | |
327 | break; | |
328 | case 3: | |
329 | igmp->rx_stats.query_v3++; | |
330 | break; | |
331 | default: | |
332 | igmp->rx_stats.unsupported++; | |
333 | } | |
334 | ||
b0f525a8 QY |
335 | /* |
336 | * RFC 3376 defines some guidelines on operating in backwards | |
337 | * compatibility with older versions of IGMP but there are some gaps in | |
338 | * the logic: | |
d62a17ae | 339 | * |
340 | * - once we drop from say version 3 to version 2 we will never go back | |
b0f525a8 QY |
341 | * to version 3 even if the node that TXed an IGMP v2 query upgrades |
342 | * to v3 | |
d62a17ae | 343 | * |
344 | * - The node with the lowest IP is the querier so we will only know to | |
b0f525a8 QY |
345 | * drop from v3 to v2 if the node that is the querier is also the one |
346 | * that is running igmp v2. If a non-querier only supports igmp v2 | |
347 | * we will have no way of knowing. | |
d62a17ae | 348 | * |
349 | * For now we will simplify things and inform the user that they need to | |
350 | * configure all PIM routers to use the same version of IGMP. | |
351 | */ | |
352 | if (query_version != pim_ifp->igmp_version) { | |
353 | zlog_warn( | |
3efd0893 | 354 | "Recv IGMP query v%d from %s on %s but we are using v%d, please configure all PIM routers on this subnet to use the same IGMP version", |
d62a17ae | 355 | query_version, from_str, ifp->name, |
356 | pim_ifp->igmp_version); | |
357 | return 0; | |
358 | } | |
359 | ||
360 | if (PIM_DEBUG_IGMP_PACKETS) { | |
361 | char group_str[INET_ADDRSTRLEN]; | |
362 | pim_inet4_dump("<group?>", group_addr, group_str, | |
363 | sizeof(group_str)); | |
364 | zlog_debug("Recv IGMP query v%d from %s on %s for group %s", | |
365 | query_version, from_str, ifp->name, group_str); | |
366 | } | |
367 | ||
368 | /* | |
369 | RFC 3376: 6.6.2. Querier Election | |
370 | ||
371 | When a router receives a query with a lower IP address, it sets | |
372 | the Other-Querier-Present timer to Other Querier Present Interval | |
373 | and ceases to send queries on the network if it was the previously | |
374 | elected querier. | |
375 | */ | |
376 | if (ntohl(from.s_addr) < ntohl(igmp->ifaddr.s_addr)) { | |
377 | ||
378 | if (PIM_DEBUG_IGMP_TRACE) { | |
379 | char ifaddr_str[INET_ADDRSTRLEN]; | |
380 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
381 | sizeof(ifaddr_str)); | |
382 | zlog_debug( | |
383 | "%s: local address %s (%u) lost querier election to %s (%u)", | |
384 | ifp->name, ifaddr_str, | |
385 | ntohl(igmp->ifaddr.s_addr), from_str, | |
386 | ntohl(from.s_addr)); | |
387 | } | |
388 | ||
389 | pim_igmp_other_querier_timer_on(igmp); | |
390 | } | |
391 | ||
392 | /* IGMP version 3 is the only one where we process the RXed query */ | |
393 | if (query_version == 3) { | |
394 | igmp_v3_recv_query(igmp, from_str, igmp_msg); | |
395 | } | |
396 | ||
397 | return 0; | |
12e41d03 DL |
398 | } |
399 | ||
d62a17ae | 400 | static void on_trace(const char *label, struct interface *ifp, |
401 | struct in_addr from) | |
12e41d03 | 402 | { |
d62a17ae | 403 | if (PIM_DEBUG_IGMP_TRACE) { |
404 | char from_str[INET_ADDRSTRLEN]; | |
405 | pim_inet4_dump("<from?>", from, from_str, sizeof(from_str)); | |
406 | zlog_debug("%s: from %s on %s", label, from_str, ifp->name); | |
407 | } | |
12e41d03 DL |
408 | } |
409 | ||
d62a17ae | 410 | static int igmp_v1_recv_report(struct igmp_sock *igmp, struct in_addr from, |
411 | const char *from_str, char *igmp_msg, | |
412 | int igmp_msg_len) | |
12e41d03 | 413 | { |
d62a17ae | 414 | struct interface *ifp = igmp->interface; |
415 | struct igmp_group *group; | |
416 | struct in_addr group_addr; | |
12e41d03 | 417 | |
15569c58 | 418 | on_trace(__func__, igmp->interface, from); |
12e41d03 | 419 | |
f83f3966 MS |
420 | if (igmp->mtrace_only) |
421 | return 0; | |
422 | ||
d62a17ae | 423 | if (igmp_msg_len != IGMP_V12_MSG_SIZE) { |
424 | zlog_warn( | |
425 | "Recv IGMP report v1 from %s on %s: size=%d other than correct=%d", | |
426 | from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE); | |
427 | return -1; | |
428 | } | |
12e41d03 | 429 | |
21313cbf MS |
430 | /* Collecting IGMP Rx stats */ |
431 | igmp->rx_stats.report_v1++; | |
432 | ||
d62a17ae | 433 | if (PIM_DEBUG_IGMP_TRACE) { |
15569c58 | 434 | zlog_warn("%s %s: FIXME WRITEME", __FILE__, __func__); |
d62a17ae | 435 | } |
12e41d03 | 436 | |
d62a17ae | 437 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
12e41d03 | 438 | |
b0f525a8 QY |
439 | if (pim_is_group_filtered(ifp->info, &group_addr)) |
440 | return -1; | |
441 | ||
d62a17ae | 442 | /* non-existant group is created as INCLUDE {empty} */ |
443 | group = igmp_add_group_by_addr(igmp, group_addr); | |
444 | if (!group) { | |
445 | return -1; | |
446 | } | |
12e41d03 | 447 | |
d62a17ae | 448 | group->last_igmp_v1_report_dsec = pim_time_monotonic_dsec(); |
12e41d03 | 449 | |
d62a17ae | 450 | return 0; |
12e41d03 DL |
451 | } |
452 | ||
453 | int pim_igmp_packet(struct igmp_sock *igmp, char *buf, size_t len) | |
454 | { | |
d62a17ae | 455 | struct ip *ip_hdr; |
456 | size_t ip_hlen; /* ip header length in bytes */ | |
457 | char *igmp_msg; | |
458 | int igmp_msg_len; | |
459 | int msg_type; | |
460 | char from_str[INET_ADDRSTRLEN]; | |
461 | char to_str[INET_ADDRSTRLEN]; | |
462 | ||
463 | if (len < sizeof(*ip_hdr)) { | |
464 | zlog_warn("IGMP packet size=%zu shorter than minimum=%zu", len, | |
465 | sizeof(*ip_hdr)); | |
466 | return -1; | |
467 | } | |
468 | ||
469 | ip_hdr = (struct ip *)buf; | |
470 | ||
471 | pim_inet4_dump("<src?>", ip_hdr->ip_src, from_str, sizeof(from_str)); | |
472 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, to_str, sizeof(to_str)); | |
473 | ||
474 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ | |
12e41d03 | 475 | |
f08e6750 QY |
476 | if (ip_hlen > len) { |
477 | zlog_warn( | |
478 | "IGMP packet header claims size %zu, but we only have %zu bytes", | |
479 | ip_hlen, len); | |
480 | return -1; | |
481 | } | |
482 | ||
d62a17ae | 483 | igmp_msg = buf + ip_hlen; |
d62a17ae | 484 | igmp_msg_len = len - ip_hlen; |
485 | ||
f08e6750 QY |
486 | if (igmp_msg_len < PIM_IGMP_MIN_LEN) { |
487 | zlog_warn("IGMP message size=%d shorter than minimum=%d", | |
488 | igmp_msg_len, PIM_IGMP_MIN_LEN); | |
489 | return -1; | |
490 | } | |
491 | ||
492 | msg_type = *igmp_msg; | |
493 | ||
d62a17ae | 494 | if (PIM_DEBUG_IGMP_PACKETS) { |
495 | zlog_debug( | |
c7e663d6 DS |
496 | "Recv IGMP packet from %s to %s on %s: size=%zu ttl=%d msg_type=%d msg_size=%d", |
497 | from_str, to_str, igmp->interface->name, len, ip_hdr->ip_ttl, | |
d62a17ae | 498 | msg_type, igmp_msg_len); |
499 | } | |
12e41d03 | 500 | |
d62a17ae | 501 | switch (msg_type) { |
502 | case PIM_IGMP_MEMBERSHIP_QUERY: { | |
503 | int max_resp_code = igmp_msg[1]; | |
504 | int query_version; | |
505 | ||
506 | /* | |
507 | RFC 3376: 7.1. Query Version Distinctions | |
508 | IGMPv1 Query: length = 8 octets AND Max Resp Code field is | |
509 | zero | |
510 | IGMPv2 Query: length = 8 octets AND Max Resp Code field is | |
511 | non-zero | |
512 | IGMPv3 Query: length >= 12 octets | |
513 | */ | |
514 | ||
515 | if (igmp_msg_len == 8) { | |
516 | query_version = max_resp_code ? 2 : 1; | |
517 | } else if (igmp_msg_len >= 12) { | |
518 | query_version = 3; | |
519 | } else { | |
520 | zlog_warn("Unknown IGMP query version"); | |
521 | return -1; | |
522 | } | |
523 | ||
524 | return igmp_recv_query(igmp, query_version, max_resp_code, | |
525 | ip_hdr->ip_src, from_str, igmp_msg, | |
526 | igmp_msg_len); | |
527 | } | |
12e41d03 | 528 | |
d62a17ae | 529 | case PIM_IGMP_V3_MEMBERSHIP_REPORT: |
530 | return igmp_v3_recv_report(igmp, ip_hdr->ip_src, from_str, | |
531 | igmp_msg, igmp_msg_len); | |
12e41d03 | 532 | |
d62a17ae | 533 | case PIM_IGMP_V2_MEMBERSHIP_REPORT: |
534 | return igmp_v2_recv_report(igmp, ip_hdr->ip_src, from_str, | |
535 | igmp_msg, igmp_msg_len); | |
12e41d03 | 536 | |
d62a17ae | 537 | case PIM_IGMP_V1_MEMBERSHIP_REPORT: |
538 | return igmp_v1_recv_report(igmp, ip_hdr->ip_src, from_str, | |
539 | igmp_msg, igmp_msg_len); | |
12e41d03 | 540 | |
d62a17ae | 541 | case PIM_IGMP_V2_LEAVE_GROUP: |
542 | return igmp_v2_recv_leave(igmp, ip_hdr->ip_src, from_str, | |
543 | igmp_msg, igmp_msg_len); | |
4d9ad5dc MS |
544 | |
545 | case PIM_IGMP_MTRACE_RESPONSE: | |
546 | return igmp_mtrace_recv_response(igmp, ip_hdr, ip_hdr->ip_src, | |
547 | from_str, igmp_msg, | |
548 | igmp_msg_len); | |
4d9ad5dc MS |
549 | case PIM_IGMP_MTRACE_QUERY_REQUEST: |
550 | return igmp_mtrace_recv_qry_req(igmp, ip_hdr, ip_hdr->ip_src, | |
551 | from_str, igmp_msg, | |
552 | igmp_msg_len); | |
d62a17ae | 553 | } |
12e41d03 | 554 | |
d62a17ae | 555 | zlog_warn("Ignoring unsupported IGMP message type: %d", msg_type); |
556 | ||
21313cbf MS |
557 | /* Collecting IGMP Rx stats */ |
558 | igmp->rx_stats.unsupported++; | |
559 | ||
d62a17ae | 560 | return -1; |
12e41d03 DL |
561 | } |
562 | ||
12e41d03 DL |
563 | void pim_igmp_general_query_on(struct igmp_sock *igmp) |
564 | { | |
d62a17ae | 565 | struct pim_interface *pim_ifp; |
566 | int startup_mode; | |
567 | int query_interval; | |
568 | ||
569 | /* | |
570 | Since this socket is starting as querier, | |
571 | there should not exist a timer for other-querier-present. | |
572 | */ | |
573 | zassert(!igmp->t_other_querier_timer); | |
574 | pim_ifp = igmp->interface->info; | |
575 | zassert(pim_ifp); | |
576 | ||
577 | /* | |
578 | RFC 3376: 8.6. Startup Query Interval | |
579 | ||
580 | The Startup Query Interval is the interval between General Queries | |
581 | sent by a Querier on startup. Default: 1/4 the Query Interval. | |
582 | The first one should be sent out immediately instead of 125/4 | |
583 | seconds from now. | |
584 | */ | |
585 | startup_mode = igmp->startup_query_count > 0; | |
586 | if (startup_mode) { | |
587 | /* | |
588 | * If this is the first time we are sending a query on a | |
589 | * newly configured igmp interface send it out in 1 second | |
590 | * just to give the entire world a tiny bit of time to settle | |
591 | * else the query interval is: | |
592 | * query_interval = pim_ifp->igmp_default_query_interval >> 2; | |
593 | */ | |
594 | if (igmp->startup_query_count | |
595 | == igmp->querier_robustness_variable) | |
596 | query_interval = 1; | |
597 | else | |
598 | query_interval = PIM_IGMP_SQI( | |
599 | pim_ifp->igmp_default_query_interval); | |
600 | ||
601 | --igmp->startup_query_count; | |
602 | } else { | |
603 | query_interval = igmp->querier_query_interval; | |
604 | } | |
605 | ||
606 | if (PIM_DEBUG_IGMP_TRACE) { | |
607 | char ifaddr_str[INET_ADDRSTRLEN]; | |
608 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
609 | sizeof(ifaddr_str)); | |
610 | zlog_debug( | |
611 | "Querier %s scheduling %d-second (%s) TIMER event for IGMP query on fd=%d", | |
612 | ifaddr_str, query_interval, | |
613 | startup_mode ? "startup" : "non-startup", igmp->fd); | |
614 | } | |
615 | igmp->t_igmp_query_timer = NULL; | |
36417fcc DS |
616 | thread_add_timer(router->master, pim_igmp_general_query, igmp, |
617 | query_interval, &igmp->t_igmp_query_timer); | |
12e41d03 DL |
618 | } |
619 | ||
620 | void pim_igmp_general_query_off(struct igmp_sock *igmp) | |
621 | { | |
d62a17ae | 622 | zassert(igmp); |
623 | ||
624 | if (PIM_DEBUG_IGMP_TRACE) { | |
625 | if (igmp->t_igmp_query_timer) { | |
626 | char ifaddr_str[INET_ADDRSTRLEN]; | |
627 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
628 | sizeof(ifaddr_str)); | |
629 | zlog_debug( | |
630 | "IGMP querier %s fd=%d cancelling query TIMER event on %s", | |
631 | ifaddr_str, igmp->fd, igmp->interface->name); | |
632 | } | |
633 | } | |
634 | THREAD_OFF(igmp->t_igmp_query_timer); | |
12e41d03 DL |
635 | } |
636 | ||
637 | /* Issue IGMP general query */ | |
638 | static int pim_igmp_general_query(struct thread *t) | |
639 | { | |
d62a17ae | 640 | struct igmp_sock *igmp; |
641 | struct in_addr dst_addr; | |
642 | struct in_addr group_addr; | |
643 | struct pim_interface *pim_ifp; | |
644 | int query_buf_size; | |
645 | ||
646 | igmp = THREAD_ARG(t); | |
647 | ||
648 | zassert(igmp->interface); | |
649 | zassert(igmp->interface->info); | |
650 | ||
651 | pim_ifp = igmp->interface->info; | |
652 | ||
653 | if (pim_ifp->igmp_version == 3) { | |
654 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; | |
655 | } else { | |
656 | query_buf_size = IGMP_V12_MSG_SIZE; | |
657 | } | |
658 | ||
659 | char query_buf[query_buf_size]; | |
660 | ||
661 | /* | |
662 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
663 | ||
664 | In IGMPv3, General Queries are sent with an IP destination address | |
665 | of 224.0.0.1, the all-systems multicast address. Group-Specific | |
666 | and Group-and-Source-Specific Queries are sent with an IP | |
667 | destination address equal to the multicast address of interest. | |
668 | */ | |
669 | ||
670 | dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); | |
671 | group_addr.s_addr = PIM_NET_INADDR_ANY; | |
672 | ||
673 | if (PIM_DEBUG_IGMP_TRACE) { | |
674 | char querier_str[INET_ADDRSTRLEN]; | |
675 | char dst_str[INET_ADDRSTRLEN]; | |
676 | pim_inet4_dump("<querier?>", igmp->ifaddr, querier_str, | |
677 | sizeof(querier_str)); | |
678 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
679 | zlog_debug("Querier %s issuing IGMP general query to %s on %s", | |
680 | querier_str, dst_str, igmp->interface->name); | |
681 | } | |
682 | ||
683 | igmp_send_query(pim_ifp->igmp_version, 0 /* igmp_group */, igmp->fd, | |
684 | igmp->interface->name, query_buf, sizeof(query_buf), | |
685 | 0 /* num_sources */, dst_addr, group_addr, | |
686 | pim_ifp->igmp_query_max_response_time_dsec, | |
687 | 1 /* s_flag: always set for general queries */, | |
688 | igmp->querier_robustness_variable, | |
689 | igmp->querier_query_interval); | |
690 | ||
691 | pim_igmp_general_query_on(igmp); | |
692 | ||
693 | return 0; | |
12e41d03 DL |
694 | } |
695 | ||
12e41d03 DL |
696 | static void sock_close(struct igmp_sock *igmp) |
697 | { | |
d62a17ae | 698 | pim_igmp_other_querier_timer_off(igmp); |
699 | pim_igmp_general_query_off(igmp); | |
700 | ||
701 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { | |
702 | if (igmp->t_igmp_read) { | |
703 | zlog_debug( | |
704 | "Cancelling READ event on IGMP socket %s fd=%d on interface %s", | |
705 | inet_ntoa(igmp->ifaddr), igmp->fd, | |
706 | igmp->interface->name); | |
707 | } | |
708 | } | |
709 | THREAD_OFF(igmp->t_igmp_read); | |
710 | ||
711 | if (close(igmp->fd)) { | |
af4c2728 | 712 | flog_err( |
450971aa | 713 | EC_LIB_SOCKET, |
d62a17ae | 714 | "Failure closing IGMP socket %s fd=%d on interface %s: errno=%d: %s", |
715 | inet_ntoa(igmp->ifaddr), igmp->fd, | |
716 | igmp->interface->name, errno, safe_strerror(errno)); | |
717 | } | |
718 | ||
719 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { | |
720 | zlog_debug("Deleted IGMP socket %s fd=%d on interface %s", | |
721 | inet_ntoa(igmp->ifaddr), igmp->fd, | |
722 | igmp->interface->name); | |
723 | } | |
12e41d03 DL |
724 | } |
725 | ||
726 | void igmp_startup_mode_on(struct igmp_sock *igmp) | |
727 | { | |
d62a17ae | 728 | struct pim_interface *pim_ifp; |
12e41d03 | 729 | |
d62a17ae | 730 | pim_ifp = igmp->interface->info; |
12e41d03 | 731 | |
d62a17ae | 732 | /* |
733 | RFC 3376: 8.7. Startup Query Count | |
12e41d03 | 734 | |
d62a17ae | 735 | The Startup Query Count is the number of Queries sent out on |
736 | startup, separated by the Startup Query Interval. Default: the | |
737 | Robustness Variable. | |
738 | */ | |
739 | igmp->startup_query_count = igmp->querier_robustness_variable; | |
12e41d03 | 740 | |
d62a17ae | 741 | /* |
742 | Since we're (re)starting, reset QQI to default Query Interval | |
743 | */ | |
744 | igmp->querier_query_interval = pim_ifp->igmp_default_query_interval; | |
12e41d03 DL |
745 | } |
746 | ||
747 | static void igmp_group_free(struct igmp_group *group) | |
748 | { | |
6a154c88 | 749 | list_delete(&group->group_source_list); |
12e41d03 | 750 | |
d62a17ae | 751 | XFREE(MTYPE_PIM_IGMP_GROUP, group); |
12e41d03 DL |
752 | } |
753 | ||
339f7695 | 754 | static void igmp_group_count_incr(struct igmp_sock *igmp) |
755 | { | |
756 | struct pim_interface *pim_ifp = igmp->interface->info; | |
757 | ||
758 | if (!pim_ifp) | |
759 | return; | |
760 | ||
761 | ++pim_ifp->pim->igmp_group_count; | |
762 | if (pim_ifp->pim->igmp_group_count | |
763 | == pim_ifp->pim->igmp_watermark_limit) { | |
764 | zlog_warn( | |
765 | "IGMP group count reached watermark limit: %u(vrf: %s)", | |
766 | pim_ifp->pim->igmp_group_count, | |
767 | VRF_LOGNAME(pim_ifp->pim->vrf)); | |
768 | } | |
769 | } | |
770 | ||
771 | static void igmp_group_count_decr(struct igmp_sock *igmp) | |
772 | { | |
773 | struct pim_interface *pim_ifp = igmp->interface->info; | |
774 | ||
775 | if (!pim_ifp) | |
776 | return; | |
777 | ||
778 | if (pim_ifp->pim->igmp_group_count == 0) { | |
779 | zlog_warn("Cannot decrement igmp group count below 0(vrf: %s)", | |
780 | VRF_LOGNAME(pim_ifp->pim->vrf)); | |
781 | return; | |
782 | } | |
783 | ||
784 | --pim_ifp->pim->igmp_group_count; | |
785 | } | |
786 | ||
4a5e6e74 | 787 | void igmp_group_delete(struct igmp_group *group) |
12e41d03 | 788 | { |
d62a17ae | 789 | struct listnode *src_node; |
790 | struct listnode *src_nextnode; | |
791 | struct igmp_source *src; | |
792 | ||
793 | if (PIM_DEBUG_IGMP_TRACE) { | |
794 | char group_str[INET_ADDRSTRLEN]; | |
795 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
796 | sizeof(group_str)); | |
797 | zlog_debug("Deleting IGMP group %s from socket %d interface %s", | |
798 | group_str, group->group_igmp_sock->fd, | |
799 | group->group_igmp_sock->interface->name); | |
800 | } | |
801 | ||
802 | for (ALL_LIST_ELEMENTS(group->group_source_list, src_node, src_nextnode, | |
803 | src)) { | |
804 | igmp_source_delete(src); | |
805 | } | |
806 | ||
807 | if (group->t_group_query_retransmit_timer) { | |
808 | THREAD_OFF(group->t_group_query_retransmit_timer); | |
809 | } | |
810 | ||
811 | group_timer_off(group); | |
339f7695 | 812 | igmp_group_count_decr(group->group_igmp_sock); |
d62a17ae | 813 | listnode_delete(group->group_igmp_sock->igmp_group_list, group); |
814 | hash_release(group->group_igmp_sock->igmp_group_hash, group); | |
815 | ||
816 | igmp_group_free(group); | |
12e41d03 DL |
817 | } |
818 | ||
819 | void igmp_group_delete_empty_include(struct igmp_group *group) | |
820 | { | |
d62a17ae | 821 | zassert(!group->group_filtermode_isexcl); |
822 | zassert(!listcount(group->group_source_list)); | |
12e41d03 | 823 | |
d62a17ae | 824 | igmp_group_delete(group); |
12e41d03 DL |
825 | } |
826 | ||
827 | void igmp_sock_free(struct igmp_sock *igmp) | |
828 | { | |
d62a17ae | 829 | zassert(!igmp->t_igmp_read); |
830 | zassert(!igmp->t_igmp_query_timer); | |
831 | zassert(!igmp->t_other_querier_timer); | |
832 | zassert(igmp->igmp_group_list); | |
833 | zassert(!listcount(igmp->igmp_group_list)); | |
12e41d03 | 834 | |
6a154c88 | 835 | list_delete(&igmp->igmp_group_list); |
d62a17ae | 836 | hash_free(igmp->igmp_group_hash); |
12e41d03 | 837 | |
d62a17ae | 838 | XFREE(MTYPE_PIM_IGMP_SOCKET, igmp); |
12e41d03 DL |
839 | } |
840 | ||
841 | void igmp_sock_delete(struct igmp_sock *igmp) | |
842 | { | |
d62a17ae | 843 | struct pim_interface *pim_ifp; |
844 | struct listnode *grp_node; | |
845 | struct listnode *grp_nextnode; | |
846 | struct igmp_group *grp; | |
847 | ||
848 | for (ALL_LIST_ELEMENTS(igmp->igmp_group_list, grp_node, grp_nextnode, | |
849 | grp)) { | |
850 | igmp_group_delete(grp); | |
851 | } | |
12e41d03 | 852 | |
d62a17ae | 853 | sock_close(igmp); |
12e41d03 | 854 | |
d62a17ae | 855 | pim_ifp = igmp->interface->info; |
12e41d03 | 856 | |
d62a17ae | 857 | listnode_delete(pim_ifp->igmp_socket_list, igmp); |
12e41d03 | 858 | |
d62a17ae | 859 | igmp_sock_free(igmp); |
12e41d03 DL |
860 | } |
861 | ||
d62a17ae | 862 | void igmp_sock_delete_all(struct interface *ifp) |
cb24fec4 | 863 | { |
d62a17ae | 864 | struct pim_interface *pim_ifp; |
865 | struct listnode *igmp_node, *igmp_nextnode; | |
866 | struct igmp_sock *igmp; | |
cb24fec4 | 867 | |
d62a17ae | 868 | pim_ifp = ifp->info; |
cb24fec4 | 869 | |
d62a17ae | 870 | for (ALL_LIST_ELEMENTS(pim_ifp->igmp_socket_list, igmp_node, |
871 | igmp_nextnode, igmp)) { | |
872 | igmp_sock_delete(igmp); | |
873 | } | |
cb24fec4 DS |
874 | } |
875 | ||
d8b87afe | 876 | static unsigned int igmp_group_hash_key(const void *arg) |
6345a326 | 877 | { |
d8b87afe | 878 | const struct igmp_group *group = arg; |
6345a326 | 879 | |
d62a17ae | 880 | return jhash_1word(group->group_addr.s_addr, 0); |
6345a326 DS |
881 | } |
882 | ||
74df8d6d | 883 | static bool igmp_group_hash_equal(const void *arg1, const void *arg2) |
6345a326 | 884 | { |
d62a17ae | 885 | const struct igmp_group *g1 = (const struct igmp_group *)arg1; |
886 | const struct igmp_group *g2 = (const struct igmp_group *)arg2; | |
6345a326 | 887 | |
d62a17ae | 888 | if (g1->group_addr.s_addr == g2->group_addr.s_addr) |
74df8d6d | 889 | return true; |
6345a326 | 890 | |
74df8d6d | 891 | return false; |
6345a326 DS |
892 | } |
893 | ||
d62a17ae | 894 | static struct igmp_sock *igmp_sock_new(int fd, struct in_addr ifaddr, |
f83f3966 | 895 | struct interface *ifp, int mtrace_only) |
12e41d03 | 896 | { |
d62a17ae | 897 | struct pim_interface *pim_ifp; |
898 | struct igmp_sock *igmp; | |
9fb302f4 | 899 | char hash_name[64]; |
d62a17ae | 900 | |
901 | pim_ifp = ifp->info; | |
902 | ||
903 | if (PIM_DEBUG_IGMP_TRACE) { | |
904 | zlog_debug( | |
905 | "Creating IGMP socket fd=%d for address %s on interface %s", | |
906 | fd, inet_ntoa(ifaddr), ifp->name); | |
907 | } | |
908 | ||
909 | igmp = XCALLOC(MTYPE_PIM_IGMP_SOCKET, sizeof(*igmp)); | |
d62a17ae | 910 | |
911 | igmp->igmp_group_list = list_new(); | |
d62a17ae | 912 | igmp->igmp_group_list->del = (void (*)(void *))igmp_group_free; |
913 | ||
772270f3 | 914 | snprintf(hash_name, sizeof(hash_name), "IGMP %s hash", ifp->name); |
9fb302f4 | 915 | igmp->igmp_group_hash = hash_create(igmp_group_hash_key, |
996c9314 | 916 | igmp_group_hash_equal, hash_name); |
d62a17ae | 917 | |
918 | igmp->fd = fd; | |
919 | igmp->interface = ifp; | |
920 | igmp->ifaddr = ifaddr; | |
921 | igmp->t_igmp_read = NULL; | |
922 | igmp->t_igmp_query_timer = NULL; | |
923 | igmp->t_other_querier_timer = NULL; /* no other querier present */ | |
924 | igmp->querier_robustness_variable = | |
925 | pim_ifp->igmp_default_robustness_variable; | |
926 | igmp->sock_creation = pim_time_monotonic_sec(); | |
927 | ||
21313cbf MS |
928 | igmp_stats_init(&igmp->rx_stats); |
929 | ||
f83f3966 MS |
930 | if (mtrace_only) { |
931 | igmp->mtrace_only = mtrace_only; | |
932 | return igmp; | |
933 | } | |
934 | ||
935 | igmp->mtrace_only = false; | |
936 | ||
d62a17ae | 937 | /* |
938 | igmp_startup_mode_on() will reset QQI: | |
939 | ||
940 | igmp->querier_query_interval = pim_ifp->igmp_default_query_interval; | |
941 | */ | |
942 | igmp_startup_mode_on(igmp); | |
943 | pim_igmp_general_query_on(igmp); | |
944 | ||
945 | return igmp; | |
12e41d03 DL |
946 | } |
947 | ||
d62a17ae | 948 | static void igmp_read_on(struct igmp_sock *igmp); |
7923d317 | 949 | |
d62a17ae | 950 | static int pim_igmp_read(struct thread *t) |
7923d317 | 951 | { |
d62a17ae | 952 | uint8_t buf[10000]; |
953 | struct igmp_sock *igmp = (struct igmp_sock *)THREAD_ARG(t); | |
954 | struct sockaddr_in from; | |
955 | struct sockaddr_in to; | |
956 | socklen_t fromlen = sizeof(from); | |
957 | socklen_t tolen = sizeof(to); | |
958 | ifindex_t ifindex = -1; | |
d62a17ae | 959 | int len; |
960 | ||
2e1cc436 | 961 | while (1) { |
d62a17ae | 962 | len = pim_socket_recvfromto(igmp->fd, buf, sizeof(buf), &from, |
963 | &fromlen, &to, &tolen, &ifindex); | |
964 | if (len < 0) { | |
965 | if (errno == EINTR) | |
966 | continue; | |
967 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
968 | break; | |
969 | ||
970 | goto done; | |
971 | } | |
7923d317 | 972 | } |
7923d317 | 973 | |
d62a17ae | 974 | done: |
975 | igmp_read_on(igmp); | |
976 | return 0; | |
7923d317 DS |
977 | } |
978 | ||
d62a17ae | 979 | static void igmp_read_on(struct igmp_sock *igmp) |
7923d317 DS |
980 | { |
981 | ||
d62a17ae | 982 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { |
983 | zlog_debug("Scheduling READ event on IGMP socket fd=%d", | |
984 | igmp->fd); | |
985 | } | |
986 | igmp->t_igmp_read = NULL; | |
36417fcc | 987 | thread_add_read(router->master, pim_igmp_read, igmp, igmp->fd, |
d62a17ae | 988 | &igmp->t_igmp_read); |
7923d317 DS |
989 | } |
990 | ||
12e41d03 DL |
991 | struct igmp_sock *pim_igmp_sock_add(struct list *igmp_sock_list, |
992 | struct in_addr ifaddr, | |
f83f3966 MS |
993 | struct interface *ifp, |
994 | bool mtrace_only) | |
12e41d03 | 995 | { |
d62a17ae | 996 | struct pim_interface *pim_ifp; |
997 | struct igmp_sock *igmp; | |
d05d3f7a | 998 | struct sockaddr_in sin; |
d62a17ae | 999 | int fd; |
12e41d03 | 1000 | |
d62a17ae | 1001 | pim_ifp = ifp->info; |
12e41d03 | 1002 | |
d62a17ae | 1003 | fd = igmp_sock_open(ifaddr, ifp, pim_ifp->options); |
1004 | if (fd < 0) { | |
1005 | zlog_warn("Could not open IGMP socket for %s on %s", | |
1006 | inet_ntoa(ifaddr), ifp->name); | |
d12f46fa | 1007 | return NULL; |
d62a17ae | 1008 | } |
12e41d03 | 1009 | |
d05d3f7a NB |
1010 | sin.sin_family = AF_INET; |
1011 | sin.sin_addr = ifaddr; | |
1012 | sin.sin_port = 0; | |
1013 | if (bind(fd, (struct sockaddr *) &sin, sizeof(sin)) != 0) { | |
1014 | zlog_warn("Could not bind IGMP socket for %s on %s", | |
1015 | inet_ntoa(ifaddr), ifp->name); | |
2c85fdd4 DS |
1016 | close(fd); |
1017 | ||
d12f46fa | 1018 | return NULL; |
d05d3f7a NB |
1019 | } |
1020 | ||
f83f3966 | 1021 | igmp = igmp_sock_new(fd, ifaddr, ifp, mtrace_only); |
12e41d03 | 1022 | |
d62a17ae | 1023 | igmp_read_on(igmp); |
7923d317 | 1024 | |
d62a17ae | 1025 | listnode_add(igmp_sock_list, igmp); |
12e41d03 DL |
1026 | |
1027 | #ifdef IGMP_SOCK_DUMP | |
d62a17ae | 1028 | igmp_sock_dump(igmp_sock_array); |
12e41d03 DL |
1029 | #endif |
1030 | ||
d62a17ae | 1031 | return igmp; |
12e41d03 DL |
1032 | } |
1033 | ||
1034 | /* | |
1035 | RFC 3376: 6.5. Switching Router Filter-Modes | |
1036 | ||
1037 | When a router's filter-mode for a group is EXCLUDE and the group | |
1038 | timer expires, the router filter-mode for the group transitions to | |
1039 | INCLUDE. | |
1040 | ||
1041 | A router uses source records with running source timers as its state | |
1042 | for the switch to a filter-mode of INCLUDE. If there are any source | |
1043 | records with source timers greater than zero (i.e., requested to be | |
1044 | forwarded), a router switches to filter-mode of INCLUDE using those | |
1045 | source records. Source records whose timers are zero (from the | |
1046 | previous EXCLUDE mode) are deleted. | |
1047 | */ | |
1048 | static int igmp_group_timer(struct thread *t) | |
1049 | { | |
d62a17ae | 1050 | struct igmp_group *group; |
12e41d03 | 1051 | |
d62a17ae | 1052 | group = THREAD_ARG(t); |
12e41d03 | 1053 | |
d62a17ae | 1054 | if (PIM_DEBUG_IGMP_TRACE) { |
1055 | char group_str[INET_ADDRSTRLEN]; | |
1056 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1057 | sizeof(group_str)); | |
15569c58 DA |
1058 | zlog_debug("%s: Timer for group %s on interface %s", __func__, |
1059 | group_str, group->group_igmp_sock->interface->name); | |
d62a17ae | 1060 | } |
12e41d03 | 1061 | |
d62a17ae | 1062 | zassert(group->group_filtermode_isexcl); |
12e41d03 | 1063 | |
d62a17ae | 1064 | group->group_filtermode_isexcl = 0; |
12e41d03 | 1065 | |
d62a17ae | 1066 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ |
1067 | igmp_anysource_forward_stop(group); | |
12e41d03 | 1068 | |
d62a17ae | 1069 | igmp_source_delete_expired(group->group_source_list); |
12e41d03 | 1070 | |
d62a17ae | 1071 | zassert(!group->group_filtermode_isexcl); |
12e41d03 | 1072 | |
d62a17ae | 1073 | /* |
1074 | RFC 3376: 6.2.2. Definition of Group Timers | |
12e41d03 | 1075 | |
d62a17ae | 1076 | If there are no more source records for the group, delete group |
1077 | record. | |
1078 | */ | |
1079 | if (listcount(group->group_source_list) < 1) { | |
1080 | igmp_group_delete_empty_include(group); | |
1081 | } | |
12e41d03 | 1082 | |
d62a17ae | 1083 | return 0; |
12e41d03 DL |
1084 | } |
1085 | ||
1086 | static void group_timer_off(struct igmp_group *group) | |
1087 | { | |
d62a17ae | 1088 | if (!group->t_group_timer) |
1089 | return; | |
1090 | ||
1091 | if (PIM_DEBUG_IGMP_TRACE) { | |
1092 | char group_str[INET_ADDRSTRLEN]; | |
1093 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1094 | sizeof(group_str)); | |
1095 | zlog_debug("Cancelling TIMER event for group %s on %s", | |
1096 | group_str, group->group_igmp_sock->interface->name); | |
1097 | } | |
1098 | THREAD_OFF(group->t_group_timer); | |
12e41d03 DL |
1099 | } |
1100 | ||
d62a17ae | 1101 | void igmp_group_timer_on(struct igmp_group *group, long interval_msec, |
1102 | const char *ifname) | |
12e41d03 | 1103 | { |
d62a17ae | 1104 | group_timer_off(group); |
1105 | ||
1106 | if (PIM_DEBUG_IGMP_EVENTS) { | |
1107 | char group_str[INET_ADDRSTRLEN]; | |
1108 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1109 | sizeof(group_str)); | |
1110 | zlog_debug( | |
1111 | "Scheduling %ld.%03ld sec TIMER event for group %s on %s", | |
1112 | interval_msec / 1000, interval_msec % 1000, group_str, | |
1113 | ifname); | |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | RFC 3376: 6.2.2. Definition of Group Timers | |
1118 | ||
1119 | The group timer is only used when a group is in EXCLUDE mode and | |
1120 | it represents the time for the *filter-mode* of the group to | |
1121 | expire and switch to INCLUDE mode. | |
1122 | */ | |
1123 | zassert(group->group_filtermode_isexcl); | |
1124 | ||
36417fcc DS |
1125 | thread_add_timer_msec(router->master, igmp_group_timer, group, |
1126 | interval_msec, &group->t_group_timer); | |
12e41d03 DL |
1127 | } |
1128 | ||
d62a17ae | 1129 | struct igmp_group *find_group_by_addr(struct igmp_sock *igmp, |
1130 | struct in_addr group_addr) | |
12e41d03 | 1131 | { |
d62a17ae | 1132 | struct igmp_group lookup; |
12e41d03 | 1133 | |
d62a17ae | 1134 | lookup.group_addr.s_addr = group_addr.s_addr; |
12e41d03 | 1135 | |
d62a17ae | 1136 | return hash_lookup(igmp->igmp_group_hash, &lookup); |
12e41d03 DL |
1137 | } |
1138 | ||
1139 | struct igmp_group *igmp_add_group_by_addr(struct igmp_sock *igmp, | |
915c13b3 | 1140 | struct in_addr group_addr) |
12e41d03 | 1141 | { |
d62a17ae | 1142 | struct igmp_group *group; |
1143 | ||
1144 | group = find_group_by_addr(igmp, group_addr); | |
1145 | if (group) { | |
1146 | return group; | |
1147 | } | |
1148 | ||
1149 | if (!pim_is_group_224_4(group_addr)) { | |
1150 | zlog_warn("%s: Group Specified is not part of 224.0.0.0/4", | |
15569c58 | 1151 | __func__); |
d62a17ae | 1152 | return NULL; |
1153 | } | |
1154 | ||
1155 | if (pim_is_group_224_0_0_0_24(group_addr)) { | |
6b5122a0 DS |
1156 | if (PIM_DEBUG_IGMP_TRACE) |
1157 | zlog_debug( | |
1158 | "%s: Group specified %s is part of 224.0.0.0/24", | |
15569c58 | 1159 | __func__, inet_ntoa(group_addr)); |
d62a17ae | 1160 | return NULL; |
1161 | } | |
1162 | /* | |
1163 | Non-existant group is created as INCLUDE {empty}: | |
1164 | ||
1165 | RFC 3376 - 5.1. Action on Change of Interface State | |
1166 | ||
1167 | If no interface state existed for that multicast address before | |
1168 | the change (i.e., the change consisted of creating a new | |
1169 | per-interface record), or if no state exists after the change | |
1170 | (i.e., the change consisted of deleting a per-interface record), | |
1171 | then the "non-existent" state is considered to have a filter mode | |
1172 | of INCLUDE and an empty source list. | |
1173 | */ | |
1174 | ||
1175 | group = XCALLOC(MTYPE_PIM_IGMP_GROUP, sizeof(*group)); | |
d62a17ae | 1176 | |
1177 | group->group_source_list = list_new(); | |
d62a17ae | 1178 | group->group_source_list->del = (void (*)(void *))igmp_source_free; |
1179 | ||
1180 | group->t_group_timer = NULL; | |
1181 | group->t_group_query_retransmit_timer = NULL; | |
1182 | group->group_specific_query_retransmit_count = 0; | |
1183 | group->group_addr = group_addr; | |
1184 | group->group_igmp_sock = igmp; | |
1185 | group->last_igmp_v1_report_dsec = -1; | |
1186 | group->last_igmp_v2_report_dsec = -1; | |
1187 | group->group_creation = pim_time_monotonic_sec(); | |
1188 | group->igmp_version = IGMP_DEFAULT_VERSION; | |
1189 | ||
1190 | /* initialize new group as INCLUDE {empty} */ | |
1191 | group->group_filtermode_isexcl = 0; /* 0=INCLUDE, 1=EXCLUDE */ | |
1192 | ||
1193 | listnode_add(igmp->igmp_group_list, group); | |
1194 | group = hash_get(igmp->igmp_group_hash, group, hash_alloc_intern); | |
1195 | ||
1196 | if (PIM_DEBUG_IGMP_TRACE) { | |
1197 | char group_str[INET_ADDRSTRLEN]; | |
1198 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1199 | sizeof(group_str)); | |
1200 | zlog_debug( | |
1201 | "Creating new IGMP group %s on socket %d interface %s", | |
1202 | group_str, igmp->fd, igmp->interface->name); | |
1203 | } | |
1204 | ||
339f7695 | 1205 | igmp_group_count_incr(igmp); |
1206 | ||
d62a17ae | 1207 | /* |
1208 | RFC 3376: 6.2.2. Definition of Group Timers | |
1209 | ||
1210 | The group timer is only used when a group is in EXCLUDE mode and | |
1211 | it represents the time for the *filter-mode* of the group to | |
1212 | expire and switch to INCLUDE mode. | |
1213 | */ | |
1214 | zassert(!group->group_filtermode_isexcl); /* INCLUDE mode */ | |
1215 | zassert(!group->t_group_timer); /* group timer == 0 */ | |
1216 | ||
1217 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
1218 | igmp_anysource_forward_stop(group); | |
1219 | ||
1220 | return group; | |
12e41d03 | 1221 | } |
b05b72e8 | 1222 | |
d62a17ae | 1223 | void igmp_send_query(int igmp_version, struct igmp_group *group, int fd, |
1224 | const char *ifname, char *query_buf, int query_buf_size, | |
1225 | int num_sources, struct in_addr dst_addr, | |
1226 | struct in_addr group_addr, | |
1227 | int query_max_response_time_dsec, uint8_t s_flag, | |
1228 | uint8_t querier_robustness_variable, | |
1229 | uint16_t querier_query_interval) | |
b05b72e8 | 1230 | { |
d62a17ae | 1231 | if (igmp_version == 3) { |
1232 | igmp_v3_send_query(group, fd, ifname, query_buf, query_buf_size, | |
1233 | num_sources, dst_addr, group_addr, | |
1234 | query_max_response_time_dsec, s_flag, | |
1235 | querier_robustness_variable, | |
1236 | querier_query_interval); | |
1237 | } else if (igmp_version == 2) { | |
1238 | igmp_v2_send_query(group, fd, ifname, query_buf, dst_addr, | |
1239 | group_addr, query_max_response_time_dsec); | |
1240 | } | |
b05b72e8 | 1241 | } |
6741a5bb | 1242 | |
1243 | void igmp_send_query_on_intf(struct interface *ifp, int igmp_ver) | |
1244 | { | |
1245 | struct pim_interface *pim_ifp = ifp->info; | |
1246 | struct listnode *sock_node = NULL; | |
1247 | struct igmp_sock *igmp = NULL; | |
1248 | struct in_addr dst_addr; | |
1249 | struct in_addr group_addr; | |
1250 | int query_buf_size; | |
1251 | ||
1252 | if (!igmp_ver) | |
1253 | igmp_ver = 2; | |
1254 | ||
1255 | if (igmp_ver == 3) | |
1256 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; | |
1257 | else | |
1258 | query_buf_size = IGMP_V12_MSG_SIZE; | |
1259 | ||
1260 | dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); | |
1261 | group_addr.s_addr = PIM_NET_INADDR_ANY; | |
1262 | ||
1263 | if (PIM_DEBUG_IGMP_TRACE) | |
1264 | zlog_debug("Issuing general query on request on %s", | |
1265 | ifp->name); | |
1266 | ||
1267 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->igmp_socket_list, sock_node, igmp)) { | |
1268 | ||
1269 | char query_buf[query_buf_size]; | |
1270 | ||
1271 | igmp_send_query(igmp_ver, 0 /* igmp_group */, igmp->fd, | |
1272 | igmp->interface->name, query_buf, | |
1273 | sizeof(query_buf), 0 /* num_sources */, | |
1274 | dst_addr, group_addr, | |
1275 | pim_ifp->igmp_query_max_response_time_dsec, | |
1276 | 1 /* s_flag: always set for general queries */, | |
1277 | igmp->querier_robustness_variable, | |
1278 | igmp->querier_query_interval); | |
1279 | } | |
1280 | } |