]>
Commit | Line | Data |
---|---|---|
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( | |
ee2bbf7c MS |
66 | "%s %s: IGMP socket fd=%d interface %pI4: could not solve %s to group address: errno=%d: %s", |
67 | __FILE__, __func__, fd, &ifaddr, | |
15569c58 | 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( | |
ee2bbf7c MS |
82 | "%s %s: IGMP socket fd=%d interface %pI4: could not solve %s to group address: errno=%d: %s", |
83 | __FILE__, __func__, fd, &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( | |
ee2bbf7c MS |
93 | "%s %s: IGMP socket fd=%d interface %pI4: could not solve %s to group address: errno=%d: %s", |
94 | __FILE__, __func__, fd, &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, |
ee2bbf7c MS |
101 | "IGMP socket fd=%d could not join any group on interface address %pI4", |
102 | fd, &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 | ||
ee2bbf7c MS |
120 | zlog_debug("%s %s: [%d/%d] igmp_addr=%pI4 fd=%d", __FILE__, |
121 | __func__, i, size, &igmp->ifaddr, | |
15569c58 | 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 | ||
12e41d03 DL |
144 | static int pim_igmp_other_querier_expire(struct thread *t) |
145 | { | |
d62a17ae | 146 | struct igmp_sock *igmp; |
147 | ||
148 | igmp = THREAD_ARG(t); | |
149 | ||
df5dfb77 | 150 | assert(!igmp->t_igmp_query_timer); |
d62a17ae | 151 | |
152 | if (PIM_DEBUG_IGMP_TRACE) { | |
153 | char ifaddr_str[INET_ADDRSTRLEN]; | |
154 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
155 | sizeof(ifaddr_str)); | |
15569c58 | 156 | zlog_debug("%s: Querier %s resuming", __func__, ifaddr_str); |
d62a17ae | 157 | } |
9a7cee26 | 158 | /* Mark the interface address as querier address */ |
159 | igmp->querier_addr = igmp->ifaddr; | |
d62a17ae | 160 | |
161 | /* | |
162 | We are the current querier, then | |
163 | re-start sending general queries. | |
164 | RFC 2236 - sec 7 Other Querier | |
165 | present timer expired (Send General | |
166 | Query, Set Gen. Query. timer) | |
167 | */ | |
168 | pim_igmp_general_query(t); | |
169 | ||
170 | return 0; | |
12e41d03 DL |
171 | } |
172 | ||
173 | void pim_igmp_other_querier_timer_on(struct igmp_sock *igmp) | |
174 | { | |
d62a17ae | 175 | long other_querier_present_interval_msec; |
176 | struct pim_interface *pim_ifp; | |
177 | ||
df5dfb77 DL |
178 | assert(igmp); |
179 | assert(igmp->interface); | |
180 | assert(igmp->interface->info); | |
d62a17ae | 181 | |
182 | pim_ifp = igmp->interface->info; | |
183 | ||
184 | if (igmp->t_other_querier_timer) { | |
185 | /* | |
186 | There is other querier present already, | |
187 | then reset the other-querier-present timer. | |
188 | */ | |
189 | ||
190 | if (PIM_DEBUG_IGMP_TRACE) { | |
191 | char ifaddr_str[INET_ADDRSTRLEN]; | |
192 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
193 | sizeof(ifaddr_str)); | |
194 | zlog_debug( | |
195 | "Querier %s resetting TIMER event for Other-Querier-Present", | |
196 | ifaddr_str); | |
197 | } | |
198 | THREAD_OFF(igmp->t_other_querier_timer); | |
199 | } else { | |
200 | /* | |
201 | We are the current querier, then stop sending general queries: | |
202 | igmp->t_igmp_query_timer = NULL; | |
203 | */ | |
204 | pim_igmp_general_query_off(igmp); | |
205 | } | |
206 | ||
207 | /* | |
208 | Since this socket is starting the other-querier-present timer, | |
209 | there should not be periodic query timer for this socket. | |
210 | */ | |
df5dfb77 | 211 | assert(!igmp->t_igmp_query_timer); |
d62a17ae | 212 | |
213 | /* | |
214 | RFC 3376: 8.5. Other Querier Present Interval | |
215 | ||
216 | The Other Querier Present Interval is the length of time that must | |
217 | pass before a multicast router decides that there is no longer | |
218 | another multicast router which should be the querier. This value | |
219 | MUST be ((the Robustness Variable) times (the Query Interval)) plus | |
220 | (one half of one Query Response Interval). | |
221 | ||
222 | other_querier_present_interval_msec = \ | |
223 | igmp->querier_robustness_variable * \ | |
224 | 1000 * igmp->querier_query_interval + \ | |
225 | 100 * (pim_ifp->query_max_response_time_dsec >> 1); | |
226 | */ | |
227 | other_querier_present_interval_msec = PIM_IGMP_OQPI_MSEC( | |
228 | igmp->querier_robustness_variable, igmp->querier_query_interval, | |
ea7d74d7 | 229 | pim_ifp->query_max_response_time_dsec); |
d62a17ae | 230 | |
231 | if (PIM_DEBUG_IGMP_TRACE) { | |
232 | char ifaddr_str[INET_ADDRSTRLEN]; | |
233 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
234 | sizeof(ifaddr_str)); | |
235 | zlog_debug( | |
236 | "Querier %s scheduling %ld.%03ld sec TIMER event for Other-Querier-Present", | |
237 | ifaddr_str, other_querier_present_interval_msec / 1000, | |
238 | other_querier_present_interval_msec % 1000); | |
239 | } | |
240 | ||
36417fcc DS |
241 | thread_add_timer_msec(router->master, pim_igmp_other_querier_expire, |
242 | igmp, other_querier_present_interval_msec, | |
d62a17ae | 243 | &igmp->t_other_querier_timer); |
12e41d03 DL |
244 | } |
245 | ||
246 | void pim_igmp_other_querier_timer_off(struct igmp_sock *igmp) | |
247 | { | |
df5dfb77 | 248 | assert(igmp); |
d62a17ae | 249 | |
250 | if (PIM_DEBUG_IGMP_TRACE) { | |
251 | if (igmp->t_other_querier_timer) { | |
252 | char ifaddr_str[INET_ADDRSTRLEN]; | |
253 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
254 | sizeof(ifaddr_str)); | |
255 | zlog_debug( | |
256 | "IGMP querier %s fd=%d cancelling other-querier-present TIMER event on %s", | |
257 | ifaddr_str, igmp->fd, igmp->interface->name); | |
258 | } | |
259 | } | |
260 | THREAD_OFF(igmp->t_other_querier_timer); | |
12e41d03 DL |
261 | } |
262 | ||
9041c30a MR |
263 | int igmp_validate_checksum(char *igmp_msg, int igmp_msg_len) |
264 | { | |
265 | uint16_t recv_checksum; | |
266 | uint16_t checksum; | |
267 | ||
268 | IGMP_GET_INT16((unsigned char *)(igmp_msg + IGMP_CHECKSUM_OFFSET), | |
269 | recv_checksum); | |
270 | ||
271 | /* Clear the checksum field */ | |
272 | memset(igmp_msg + IGMP_CHECKSUM_OFFSET, 0, 2); | |
273 | ||
274 | checksum = in_cksum(igmp_msg, igmp_msg_len); | |
275 | if (ntohs(checksum) != recv_checksum) { | |
276 | zlog_warn("Invalid checksum received %x, calculated %x", | |
277 | recv_checksum, ntohs(checksum)); | |
278 | return -1; | |
279 | } | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
d62a17ae | 284 | static int igmp_recv_query(struct igmp_sock *igmp, int query_version, |
285 | int max_resp_code, struct in_addr from, | |
286 | const char *from_str, char *igmp_msg, | |
287 | int igmp_msg_len) | |
12e41d03 | 288 | { |
d62a17ae | 289 | struct interface *ifp; |
290 | struct pim_interface *pim_ifp; | |
291 | struct in_addr group_addr; | |
d62a17ae | 292 | |
f83f3966 MS |
293 | if (igmp->mtrace_only) |
294 | return 0; | |
295 | ||
d62a17ae | 296 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
297 | ||
298 | ifp = igmp->interface; | |
299 | pim_ifp = ifp->info; | |
300 | ||
9041c30a | 301 | if (igmp_validate_checksum(igmp_msg, igmp_msg_len) == -1) { |
d62a17ae | 302 | zlog_warn( |
9041c30a MR |
303 | "Recv IGMP query v%d from %s on %s with invalid checksum", |
304 | query_version, from_str, ifp->name); | |
d62a17ae | 305 | return -1; |
306 | } | |
307 | ||
8890b440 DS |
308 | if (!pim_if_connected_to_source(ifp, from)) { |
309 | if (PIM_DEBUG_IGMP_PACKETS) | |
310 | zlog_debug("Recv IGMP query on interface: %s from a non-connected source: %s", | |
311 | ifp->name, from_str); | |
312 | return 0; | |
313 | } | |
314 | ||
096f7609 | 315 | if (if_address_is_local(&from, AF_INET, ifp->vrf->vrf_id)) { |
26a0f1e2 DS |
316 | if (PIM_DEBUG_IGMP_PACKETS) |
317 | zlog_debug("Recv IGMP query on interface: %s from ourself %s", | |
318 | ifp->name, from_str); | |
319 | return 0; | |
320 | } | |
321 | ||
21313cbf MS |
322 | /* Collecting IGMP Rx stats */ |
323 | switch (query_version) { | |
324 | case 1: | |
325 | igmp->rx_stats.query_v1++; | |
326 | break; | |
327 | case 2: | |
328 | igmp->rx_stats.query_v2++; | |
329 | break; | |
330 | case 3: | |
331 | igmp->rx_stats.query_v3++; | |
332 | break; | |
333 | default: | |
334 | igmp->rx_stats.unsupported++; | |
335 | } | |
336 | ||
b0f525a8 QY |
337 | /* |
338 | * RFC 3376 defines some guidelines on operating in backwards | |
339 | * compatibility with older versions of IGMP but there are some gaps in | |
340 | * the logic: | |
d62a17ae | 341 | * |
342 | * - once we drop from say version 3 to version 2 we will never go back | |
b0f525a8 QY |
343 | * to version 3 even if the node that TXed an IGMP v2 query upgrades |
344 | * to v3 | |
d62a17ae | 345 | * |
346 | * - The node with the lowest IP is the querier so we will only know to | |
b0f525a8 QY |
347 | * drop from v3 to v2 if the node that is the querier is also the one |
348 | * that is running igmp v2. If a non-querier only supports igmp v2 | |
349 | * we will have no way of knowing. | |
d62a17ae | 350 | * |
351 | * For now we will simplify things and inform the user that they need to | |
352 | * configure all PIM routers to use the same version of IGMP. | |
353 | */ | |
ea7d74d7 | 354 | if (query_version != pim_ifp->version) { |
d62a17ae | 355 | zlog_warn( |
3efd0893 | 356 | "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", |
ea7d74d7 | 357 | query_version, from_str, ifp->name, pim_ifp->version); |
d62a17ae | 358 | return 0; |
359 | } | |
360 | ||
361 | if (PIM_DEBUG_IGMP_PACKETS) { | |
362 | char group_str[INET_ADDRSTRLEN]; | |
363 | pim_inet4_dump("<group?>", group_addr, group_str, | |
364 | sizeof(group_str)); | |
365 | zlog_debug("Recv IGMP query v%d from %s on %s for group %s", | |
366 | query_version, from_str, ifp->name, group_str); | |
367 | } | |
368 | ||
369 | /* | |
370 | RFC 3376: 6.6.2. Querier Election | |
371 | ||
372 | When a router receives a query with a lower IP address, it sets | |
373 | the Other-Querier-Present timer to Other Querier Present Interval | |
374 | and ceases to send queries on the network if it was the previously | |
375 | elected querier. | |
376 | */ | |
377 | if (ntohl(from.s_addr) < ntohl(igmp->ifaddr.s_addr)) { | |
378 | ||
379 | if (PIM_DEBUG_IGMP_TRACE) { | |
380 | char ifaddr_str[INET_ADDRSTRLEN]; | |
381 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
382 | sizeof(ifaddr_str)); | |
383 | zlog_debug( | |
384 | "%s: local address %s (%u) lost querier election to %s (%u)", | |
385 | ifp->name, ifaddr_str, | |
386 | ntohl(igmp->ifaddr.s_addr), from_str, | |
387 | ntohl(from.s_addr)); | |
388 | } | |
9a7cee26 | 389 | if (ntohl(from.s_addr) < ntohl(igmp->querier_addr.s_addr)) |
390 | igmp->querier_addr.s_addr = from.s_addr; | |
d62a17ae | 391 | |
392 | pim_igmp_other_querier_timer_on(igmp); | |
393 | } | |
394 | ||
395 | /* IGMP version 3 is the only one where we process the RXed query */ | |
396 | if (query_version == 3) { | |
397 | igmp_v3_recv_query(igmp, from_str, igmp_msg); | |
398 | } | |
399 | ||
400 | return 0; | |
12e41d03 DL |
401 | } |
402 | ||
d62a17ae | 403 | static void on_trace(const char *label, struct interface *ifp, |
404 | struct in_addr from) | |
12e41d03 | 405 | { |
d62a17ae | 406 | if (PIM_DEBUG_IGMP_TRACE) { |
407 | char from_str[INET_ADDRSTRLEN]; | |
408 | pim_inet4_dump("<from?>", from, from_str, sizeof(from_str)); | |
409 | zlog_debug("%s: from %s on %s", label, from_str, ifp->name); | |
410 | } | |
12e41d03 DL |
411 | } |
412 | ||
d62a17ae | 413 | static int igmp_v1_recv_report(struct igmp_sock *igmp, struct in_addr from, |
414 | const char *from_str, char *igmp_msg, | |
415 | int igmp_msg_len) | |
12e41d03 | 416 | { |
d62a17ae | 417 | struct interface *ifp = igmp->interface; |
418 | struct igmp_group *group; | |
419 | struct in_addr group_addr; | |
12e41d03 | 420 | |
15569c58 | 421 | on_trace(__func__, igmp->interface, from); |
12e41d03 | 422 | |
f83f3966 MS |
423 | if (igmp->mtrace_only) |
424 | return 0; | |
425 | ||
d62a17ae | 426 | if (igmp_msg_len != IGMP_V12_MSG_SIZE) { |
427 | zlog_warn( | |
428 | "Recv IGMP report v1 from %s on %s: size=%d other than correct=%d", | |
429 | from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE); | |
430 | return -1; | |
431 | } | |
12e41d03 | 432 | |
9041c30a MR |
433 | if (igmp_validate_checksum(igmp_msg, igmp_msg_len) == -1) { |
434 | zlog_warn( | |
435 | "Recv IGMP report v1 from %s on %s with invalid checksum", | |
436 | from_str, ifp->name); | |
437 | return -1; | |
438 | } | |
439 | ||
21313cbf MS |
440 | /* Collecting IGMP Rx stats */ |
441 | igmp->rx_stats.report_v1++; | |
442 | ||
d62a17ae | 443 | if (PIM_DEBUG_IGMP_TRACE) { |
15569c58 | 444 | zlog_warn("%s %s: FIXME WRITEME", __FILE__, __func__); |
d62a17ae | 445 | } |
12e41d03 | 446 | |
d62a17ae | 447 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
12e41d03 | 448 | |
b0f525a8 QY |
449 | if (pim_is_group_filtered(ifp->info, &group_addr)) |
450 | return -1; | |
451 | ||
d62a17ae | 452 | /* non-existant group is created as INCLUDE {empty} */ |
453 | group = igmp_add_group_by_addr(igmp, group_addr); | |
454 | if (!group) { | |
455 | return -1; | |
456 | } | |
12e41d03 | 457 | |
d62a17ae | 458 | group->last_igmp_v1_report_dsec = pim_time_monotonic_dsec(); |
12e41d03 | 459 | |
d62a17ae | 460 | return 0; |
12e41d03 DL |
461 | } |
462 | ||
88ea79ad | 463 | bool pim_igmp_verify_header(struct ip *ip_hdr, size_t len, size_t *hlen) |
ff4ad870 | 464 | { |
88ea79ad MR |
465 | char *igmp_msg; |
466 | int igmp_msg_len; | |
467 | int msg_type; | |
468 | size_t ip_hlen; /* ip header length in bytes */ | |
469 | ||
ff4ad870 MR |
470 | if (len < sizeof(*ip_hdr)) { |
471 | zlog_warn("IGMP packet size=%zu shorter than minimum=%zu", len, | |
472 | sizeof(*ip_hdr)); | |
473 | return false; | |
474 | } | |
475 | ||
88ea79ad MR |
476 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ |
477 | *hlen = ip_hlen; | |
478 | ||
479 | if (ip_hlen > len) { | |
480 | zlog_warn( | |
481 | "IGMP packet header claims size %zu, but we only have %zu bytes", | |
482 | ip_hlen, len); | |
483 | return false; | |
484 | } | |
485 | ||
486 | igmp_msg = (char *)ip_hdr + ip_hlen; | |
487 | igmp_msg_len = len - ip_hlen; | |
488 | msg_type = *igmp_msg; | |
489 | ||
ff4ad870 MR |
490 | if (igmp_msg_len < PIM_IGMP_MIN_LEN) { |
491 | zlog_warn("IGMP message size=%d shorter than minimum=%d", | |
492 | igmp_msg_len, PIM_IGMP_MIN_LEN); | |
493 | return false; | |
494 | } | |
495 | ||
54d7bf0c MR |
496 | if ((msg_type != PIM_IGMP_MTRACE_RESPONSE) |
497 | && (msg_type != PIM_IGMP_MTRACE_QUERY_REQUEST)) { | |
498 | if (ip_hdr->ip_ttl != 1) { | |
499 | zlog_warn( | |
500 | "Recv IGMP packet with invalid ttl=%u, discarding the packet", | |
501 | ip_hdr->ip_ttl); | |
e748f180 | 502 | return false; |
54d7bf0c MR |
503 | } |
504 | } | |
505 | ||
e39f74d0 MR |
506 | if ((msg_type == PIM_IGMP_V3_MEMBERSHIP_REPORT) |
507 | || ((msg_type == PIM_IGMP_MEMBERSHIP_QUERY) | |
508 | && (igmp_msg_len >= IGMP_V3_SOURCES_OFFSET))) { | |
509 | /* All IGMPv3 messages must be received with TOS set to 0xC0*/ | |
510 | if (ip_hdr->ip_tos != IPTOS_PREC_INTERNETCONTROL) { | |
511 | zlog_warn("Received IGMP Packet with invalid TOS %u", | |
512 | ip_hdr->ip_tos); | |
e748f180 | 513 | return false; |
e39f74d0 MR |
514 | } |
515 | } | |
516 | ||
ff4ad870 MR |
517 | return true; |
518 | } | |
519 | ||
12e41d03 DL |
520 | int pim_igmp_packet(struct igmp_sock *igmp, char *buf, size_t len) |
521 | { | |
88ea79ad | 522 | struct ip *ip_hdr = (struct ip *)buf; |
d62a17ae | 523 | size_t ip_hlen; /* ip header length in bytes */ |
524 | char *igmp_msg; | |
525 | int igmp_msg_len; | |
526 | int msg_type; | |
527 | char from_str[INET_ADDRSTRLEN]; | |
528 | char to_str[INET_ADDRSTRLEN]; | |
529 | ||
88ea79ad | 530 | if (!pim_igmp_verify_header(ip_hdr, len, &ip_hlen)) |
f08e6750 | 531 | return -1; |
f08e6750 | 532 | |
d62a17ae | 533 | igmp_msg = buf + ip_hlen; |
d62a17ae | 534 | igmp_msg_len = len - ip_hlen; |
f08e6750 QY |
535 | msg_type = *igmp_msg; |
536 | ||
ff4ad870 MR |
537 | pim_inet4_dump("<src?>", ip_hdr->ip_src, from_str, sizeof(from_str)); |
538 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, to_str, sizeof(to_str)); | |
539 | ||
d62a17ae | 540 | if (PIM_DEBUG_IGMP_PACKETS) { |
541 | zlog_debug( | |
c7e663d6 DS |
542 | "Recv IGMP packet from %s to %s on %s: size=%zu ttl=%d msg_type=%d msg_size=%d", |
543 | from_str, to_str, igmp->interface->name, len, ip_hdr->ip_ttl, | |
d62a17ae | 544 | msg_type, igmp_msg_len); |
545 | } | |
12e41d03 | 546 | |
d62a17ae | 547 | switch (msg_type) { |
548 | case PIM_IGMP_MEMBERSHIP_QUERY: { | |
549 | int max_resp_code = igmp_msg[1]; | |
550 | int query_version; | |
551 | ||
552 | /* | |
553 | RFC 3376: 7.1. Query Version Distinctions | |
554 | IGMPv1 Query: length = 8 octets AND Max Resp Code field is | |
555 | zero | |
556 | IGMPv2 Query: length = 8 octets AND Max Resp Code field is | |
557 | non-zero | |
558 | IGMPv3 Query: length >= 12 octets | |
559 | */ | |
560 | ||
561 | if (igmp_msg_len == 8) { | |
562 | query_version = max_resp_code ? 2 : 1; | |
563 | } else if (igmp_msg_len >= 12) { | |
564 | query_version = 3; | |
565 | } else { | |
566 | zlog_warn("Unknown IGMP query version"); | |
567 | return -1; | |
568 | } | |
569 | ||
570 | return igmp_recv_query(igmp, query_version, max_resp_code, | |
571 | ip_hdr->ip_src, from_str, igmp_msg, | |
572 | igmp_msg_len); | |
573 | } | |
12e41d03 | 574 | |
d62a17ae | 575 | case PIM_IGMP_V3_MEMBERSHIP_REPORT: |
576 | return igmp_v3_recv_report(igmp, ip_hdr->ip_src, from_str, | |
577 | igmp_msg, igmp_msg_len); | |
12e41d03 | 578 | |
d62a17ae | 579 | case PIM_IGMP_V2_MEMBERSHIP_REPORT: |
580 | return igmp_v2_recv_report(igmp, ip_hdr->ip_src, from_str, | |
581 | igmp_msg, igmp_msg_len); | |
12e41d03 | 582 | |
d62a17ae | 583 | case PIM_IGMP_V1_MEMBERSHIP_REPORT: |
584 | return igmp_v1_recv_report(igmp, ip_hdr->ip_src, from_str, | |
585 | igmp_msg, igmp_msg_len); | |
12e41d03 | 586 | |
d62a17ae | 587 | case PIM_IGMP_V2_LEAVE_GROUP: |
d1b61cb9 MR |
588 | return igmp_v2_recv_leave(igmp, ip_hdr, from_str, igmp_msg, |
589 | igmp_msg_len); | |
4d9ad5dc MS |
590 | |
591 | case PIM_IGMP_MTRACE_RESPONSE: | |
592 | return igmp_mtrace_recv_response(igmp, ip_hdr, ip_hdr->ip_src, | |
593 | from_str, igmp_msg, | |
594 | igmp_msg_len); | |
4d9ad5dc MS |
595 | case PIM_IGMP_MTRACE_QUERY_REQUEST: |
596 | return igmp_mtrace_recv_qry_req(igmp, ip_hdr, ip_hdr->ip_src, | |
597 | from_str, igmp_msg, | |
598 | igmp_msg_len); | |
d62a17ae | 599 | } |
12e41d03 | 600 | |
d62a17ae | 601 | zlog_warn("Ignoring unsupported IGMP message type: %d", msg_type); |
602 | ||
21313cbf MS |
603 | /* Collecting IGMP Rx stats */ |
604 | igmp->rx_stats.unsupported++; | |
605 | ||
d62a17ae | 606 | return -1; |
12e41d03 DL |
607 | } |
608 | ||
12e41d03 DL |
609 | void pim_igmp_general_query_on(struct igmp_sock *igmp) |
610 | { | |
d62a17ae | 611 | struct pim_interface *pim_ifp; |
612 | int startup_mode; | |
613 | int query_interval; | |
614 | ||
615 | /* | |
616 | Since this socket is starting as querier, | |
617 | there should not exist a timer for other-querier-present. | |
618 | */ | |
df5dfb77 | 619 | assert(!igmp->t_other_querier_timer); |
d62a17ae | 620 | pim_ifp = igmp->interface->info; |
df5dfb77 | 621 | assert(pim_ifp); |
d62a17ae | 622 | |
623 | /* | |
624 | RFC 3376: 8.6. Startup Query Interval | |
625 | ||
626 | The Startup Query Interval is the interval between General Queries | |
627 | sent by a Querier on startup. Default: 1/4 the Query Interval. | |
628 | The first one should be sent out immediately instead of 125/4 | |
629 | seconds from now. | |
630 | */ | |
631 | startup_mode = igmp->startup_query_count > 0; | |
632 | if (startup_mode) { | |
633 | /* | |
634 | * If this is the first time we are sending a query on a | |
635 | * newly configured igmp interface send it out in 1 second | |
636 | * just to give the entire world a tiny bit of time to settle | |
637 | * else the query interval is: | |
ea7d74d7 | 638 | * query_interval = pim_ifp->default_query_interval >> 2; |
d62a17ae | 639 | */ |
640 | if (igmp->startup_query_count | |
641 | == igmp->querier_robustness_variable) | |
642 | query_interval = 1; | |
643 | else | |
ea7d74d7 SG |
644 | query_interval = |
645 | PIM_IGMP_SQI(pim_ifp->default_query_interval); | |
d62a17ae | 646 | |
647 | --igmp->startup_query_count; | |
648 | } else { | |
649 | query_interval = igmp->querier_query_interval; | |
650 | } | |
651 | ||
652 | if (PIM_DEBUG_IGMP_TRACE) { | |
653 | char ifaddr_str[INET_ADDRSTRLEN]; | |
654 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
655 | sizeof(ifaddr_str)); | |
656 | zlog_debug( | |
657 | "Querier %s scheduling %d-second (%s) TIMER event for IGMP query on fd=%d", | |
658 | ifaddr_str, query_interval, | |
659 | startup_mode ? "startup" : "non-startup", igmp->fd); | |
660 | } | |
36417fcc DS |
661 | thread_add_timer(router->master, pim_igmp_general_query, igmp, |
662 | query_interval, &igmp->t_igmp_query_timer); | |
12e41d03 DL |
663 | } |
664 | ||
665 | void pim_igmp_general_query_off(struct igmp_sock *igmp) | |
666 | { | |
df5dfb77 | 667 | assert(igmp); |
d62a17ae | 668 | |
669 | if (PIM_DEBUG_IGMP_TRACE) { | |
670 | if (igmp->t_igmp_query_timer) { | |
671 | char ifaddr_str[INET_ADDRSTRLEN]; | |
672 | pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, | |
673 | sizeof(ifaddr_str)); | |
674 | zlog_debug( | |
675 | "IGMP querier %s fd=%d cancelling query TIMER event on %s", | |
676 | ifaddr_str, igmp->fd, igmp->interface->name); | |
677 | } | |
678 | } | |
679 | THREAD_OFF(igmp->t_igmp_query_timer); | |
12e41d03 DL |
680 | } |
681 | ||
682 | /* Issue IGMP general query */ | |
683 | static int pim_igmp_general_query(struct thread *t) | |
684 | { | |
d62a17ae | 685 | struct igmp_sock *igmp; |
686 | struct in_addr dst_addr; | |
687 | struct in_addr group_addr; | |
688 | struct pim_interface *pim_ifp; | |
689 | int query_buf_size; | |
690 | ||
691 | igmp = THREAD_ARG(t); | |
692 | ||
df5dfb77 DL |
693 | assert(igmp->interface); |
694 | assert(igmp->interface->info); | |
d62a17ae | 695 | |
696 | pim_ifp = igmp->interface->info; | |
697 | ||
ea7d74d7 | 698 | if (pim_ifp->version == 3) { |
d62a17ae | 699 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; |
700 | } else { | |
701 | query_buf_size = IGMP_V12_MSG_SIZE; | |
702 | } | |
703 | ||
704 | char query_buf[query_buf_size]; | |
705 | ||
706 | /* | |
707 | RFC3376: 4.1.12. IP Destination Addresses for Queries | |
708 | ||
709 | In IGMPv3, General Queries are sent with an IP destination address | |
710 | of 224.0.0.1, the all-systems multicast address. Group-Specific | |
711 | and Group-and-Source-Specific Queries are sent with an IP | |
712 | destination address equal to the multicast address of interest. | |
713 | */ | |
714 | ||
715 | dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); | |
716 | group_addr.s_addr = PIM_NET_INADDR_ANY; | |
717 | ||
718 | if (PIM_DEBUG_IGMP_TRACE) { | |
719 | char querier_str[INET_ADDRSTRLEN]; | |
720 | char dst_str[INET_ADDRSTRLEN]; | |
721 | pim_inet4_dump("<querier?>", igmp->ifaddr, querier_str, | |
722 | sizeof(querier_str)); | |
723 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
724 | zlog_debug("Querier %s issuing IGMP general query to %s on %s", | |
725 | querier_str, dst_str, igmp->interface->name); | |
726 | } | |
727 | ||
ea7d74d7 | 728 | igmp_send_query(pim_ifp->version, 0 /* igmp_group */, igmp->fd, |
d62a17ae | 729 | igmp->interface->name, query_buf, sizeof(query_buf), |
730 | 0 /* num_sources */, dst_addr, group_addr, | |
ea7d74d7 | 731 | pim_ifp->query_max_response_time_dsec, |
d62a17ae | 732 | 1 /* s_flag: always set for general queries */, |
733 | igmp->querier_robustness_variable, | |
734 | igmp->querier_query_interval); | |
735 | ||
736 | pim_igmp_general_query_on(igmp); | |
737 | ||
738 | return 0; | |
12e41d03 DL |
739 | } |
740 | ||
12e41d03 DL |
741 | static void sock_close(struct igmp_sock *igmp) |
742 | { | |
d62a17ae | 743 | pim_igmp_other_querier_timer_off(igmp); |
744 | pim_igmp_general_query_off(igmp); | |
745 | ||
746 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { | |
747 | if (igmp->t_igmp_read) { | |
748 | zlog_debug( | |
ee2bbf7c MS |
749 | "Cancelling READ event on IGMP socket %pI4 fd=%d on interface %s", |
750 | &igmp->ifaddr, igmp->fd, | |
d62a17ae | 751 | igmp->interface->name); |
752 | } | |
753 | } | |
754 | THREAD_OFF(igmp->t_igmp_read); | |
755 | ||
756 | if (close(igmp->fd)) { | |
af4c2728 | 757 | flog_err( |
450971aa | 758 | EC_LIB_SOCKET, |
ee2bbf7c MS |
759 | "Failure closing IGMP socket %pI4 fd=%d on interface %s: errno=%d: %s", |
760 | &igmp->ifaddr, igmp->fd, | |
d62a17ae | 761 | igmp->interface->name, errno, safe_strerror(errno)); |
762 | } | |
763 | ||
764 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { | |
ee2bbf7c MS |
765 | zlog_debug("Deleted IGMP socket %pI4 fd=%d on interface %s", |
766 | &igmp->ifaddr, igmp->fd, | |
d62a17ae | 767 | igmp->interface->name); |
768 | } | |
12e41d03 DL |
769 | } |
770 | ||
771 | void igmp_startup_mode_on(struct igmp_sock *igmp) | |
772 | { | |
d62a17ae | 773 | struct pim_interface *pim_ifp; |
12e41d03 | 774 | |
d62a17ae | 775 | pim_ifp = igmp->interface->info; |
12e41d03 | 776 | |
d62a17ae | 777 | /* |
778 | RFC 3376: 8.7. Startup Query Count | |
12e41d03 | 779 | |
d62a17ae | 780 | The Startup Query Count is the number of Queries sent out on |
781 | startup, separated by the Startup Query Interval. Default: the | |
782 | Robustness Variable. | |
783 | */ | |
784 | igmp->startup_query_count = igmp->querier_robustness_variable; | |
12e41d03 | 785 | |
d62a17ae | 786 | /* |
787 | Since we're (re)starting, reset QQI to default Query Interval | |
788 | */ | |
ea7d74d7 | 789 | igmp->querier_query_interval = pim_ifp->default_query_interval; |
12e41d03 DL |
790 | } |
791 | ||
792 | static void igmp_group_free(struct igmp_group *group) | |
793 | { | |
6a154c88 | 794 | list_delete(&group->group_source_list); |
12e41d03 | 795 | |
d62a17ae | 796 | XFREE(MTYPE_PIM_IGMP_GROUP, group); |
12e41d03 DL |
797 | } |
798 | ||
dda4d23c | 799 | static void igmp_group_count_incr(struct pim_interface *pim_ifp) |
339f7695 | 800 | { |
339f7695 | 801 | ++pim_ifp->pim->igmp_group_count; |
802 | if (pim_ifp->pim->igmp_group_count | |
803 | == pim_ifp->pim->igmp_watermark_limit) { | |
804 | zlog_warn( | |
805 | "IGMP group count reached watermark limit: %u(vrf: %s)", | |
806 | pim_ifp->pim->igmp_group_count, | |
807 | VRF_LOGNAME(pim_ifp->pim->vrf)); | |
808 | } | |
809 | } | |
810 | ||
dda4d23c | 811 | static void igmp_group_count_decr(struct pim_interface *pim_ifp) |
339f7695 | 812 | { |
339f7695 | 813 | if (pim_ifp->pim->igmp_group_count == 0) { |
814 | zlog_warn("Cannot decrement igmp group count below 0(vrf: %s)", | |
815 | VRF_LOGNAME(pim_ifp->pim->vrf)); | |
816 | return; | |
817 | } | |
818 | ||
819 | --pim_ifp->pim->igmp_group_count; | |
820 | } | |
821 | ||
4a5e6e74 | 822 | void igmp_group_delete(struct igmp_group *group) |
12e41d03 | 823 | { |
d62a17ae | 824 | struct listnode *src_node; |
825 | struct listnode *src_nextnode; | |
826 | struct igmp_source *src; | |
dda4d23c | 827 | struct pim_interface *pim_ifp = group->interface->info; |
d62a17ae | 828 | |
829 | if (PIM_DEBUG_IGMP_TRACE) { | |
830 | char group_str[INET_ADDRSTRLEN]; | |
831 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
832 | sizeof(group_str)); | |
dda4d23c DL |
833 | zlog_debug("Deleting IGMP group %s from interface %s", |
834 | group_str, group->interface->name); | |
d62a17ae | 835 | } |
836 | ||
837 | for (ALL_LIST_ELEMENTS(group->group_source_list, src_node, src_nextnode, | |
838 | src)) { | |
839 | igmp_source_delete(src); | |
840 | } | |
841 | ||
28ef0ee1 | 842 | THREAD_OFF(group->t_group_query_retransmit_timer); |
d62a17ae | 843 | |
844 | group_timer_off(group); | |
dda4d23c | 845 | igmp_group_count_decr(pim_ifp); |
ea7d74d7 SG |
846 | listnode_delete(pim_ifp->group_list, group); |
847 | hash_release(pim_ifp->group_hash, group); | |
d62a17ae | 848 | |
849 | igmp_group_free(group); | |
12e41d03 DL |
850 | } |
851 | ||
852 | void igmp_group_delete_empty_include(struct igmp_group *group) | |
853 | { | |
df5dfb77 DL |
854 | assert(!group->group_filtermode_isexcl); |
855 | assert(!listcount(group->group_source_list)); | |
12e41d03 | 856 | |
d62a17ae | 857 | igmp_group_delete(group); |
12e41d03 DL |
858 | } |
859 | ||
860 | void igmp_sock_free(struct igmp_sock *igmp) | |
861 | { | |
df5dfb77 DL |
862 | assert(!igmp->t_igmp_read); |
863 | assert(!igmp->t_igmp_query_timer); | |
864 | assert(!igmp->t_other_querier_timer); | |
12e41d03 | 865 | |
d62a17ae | 866 | XFREE(MTYPE_PIM_IGMP_SOCKET, igmp); |
12e41d03 DL |
867 | } |
868 | ||
869 | void igmp_sock_delete(struct igmp_sock *igmp) | |
870 | { | |
d62a17ae | 871 | struct pim_interface *pim_ifp; |
12e41d03 | 872 | |
d62a17ae | 873 | sock_close(igmp); |
12e41d03 | 874 | |
d62a17ae | 875 | pim_ifp = igmp->interface->info; |
12e41d03 | 876 | |
ea7d74d7 | 877 | listnode_delete(pim_ifp->socket_list, igmp); |
12e41d03 | 878 | |
d62a17ae | 879 | igmp_sock_free(igmp); |
dda4d23c | 880 | |
ea7d74d7 | 881 | if (!listcount(pim_ifp->socket_list)) |
dda4d23c | 882 | pim_igmp_if_reset(pim_ifp); |
12e41d03 DL |
883 | } |
884 | ||
d62a17ae | 885 | void igmp_sock_delete_all(struct interface *ifp) |
cb24fec4 | 886 | { |
d62a17ae | 887 | struct pim_interface *pim_ifp; |
888 | struct listnode *igmp_node, *igmp_nextnode; | |
889 | struct igmp_sock *igmp; | |
cb24fec4 | 890 | |
d62a17ae | 891 | pim_ifp = ifp->info; |
cb24fec4 | 892 | |
ea7d74d7 SG |
893 | for (ALL_LIST_ELEMENTS(pim_ifp->socket_list, igmp_node, igmp_nextnode, |
894 | igmp)) { | |
d62a17ae | 895 | igmp_sock_delete(igmp); |
896 | } | |
cb24fec4 DS |
897 | } |
898 | ||
d8b87afe | 899 | static unsigned int igmp_group_hash_key(const void *arg) |
6345a326 | 900 | { |
d8b87afe | 901 | const struct igmp_group *group = arg; |
6345a326 | 902 | |
d62a17ae | 903 | return jhash_1word(group->group_addr.s_addr, 0); |
6345a326 DS |
904 | } |
905 | ||
74df8d6d | 906 | static bool igmp_group_hash_equal(const void *arg1, const void *arg2) |
6345a326 | 907 | { |
d62a17ae | 908 | const struct igmp_group *g1 = (const struct igmp_group *)arg1; |
909 | const struct igmp_group *g2 = (const struct igmp_group *)arg2; | |
6345a326 | 910 | |
d62a17ae | 911 | if (g1->group_addr.s_addr == g2->group_addr.s_addr) |
74df8d6d | 912 | return true; |
6345a326 | 913 | |
74df8d6d | 914 | return false; |
6345a326 DS |
915 | } |
916 | ||
dda4d23c DL |
917 | void pim_igmp_if_init(struct pim_interface *pim_ifp, struct interface *ifp) |
918 | { | |
919 | char hash_name[64]; | |
920 | ||
ea7d74d7 SG |
921 | pim_ifp->socket_list = list_new(); |
922 | pim_ifp->socket_list->del = (void (*)(void *))igmp_sock_free; | |
dda4d23c | 923 | |
ea7d74d7 SG |
924 | pim_ifp->group_list = list_new(); |
925 | pim_ifp->group_list->del = (void (*)(void *))igmp_group_free; | |
dda4d23c | 926 | |
a1a4295a | 927 | snprintf(hash_name, sizeof(hash_name), "IGMP %s hash", ifp->name); |
ea7d74d7 SG |
928 | pim_ifp->group_hash = hash_create(igmp_group_hash_key, |
929 | igmp_group_hash_equal, hash_name); | |
dda4d23c DL |
930 | } |
931 | ||
932 | void pim_igmp_if_reset(struct pim_interface *pim_ifp) | |
933 | { | |
934 | struct listnode *grp_node, *grp_nextnode; | |
935 | struct igmp_group *grp; | |
936 | ||
ea7d74d7 | 937 | for (ALL_LIST_ELEMENTS(pim_ifp->group_list, grp_node, grp_nextnode, |
dda4d23c DL |
938 | grp)) { |
939 | igmp_group_delete(grp); | |
940 | } | |
941 | } | |
942 | ||
943 | void pim_igmp_if_fini(struct pim_interface *pim_ifp) | |
944 | { | |
945 | pim_igmp_if_reset(pim_ifp); | |
946 | ||
ea7d74d7 SG |
947 | assert(pim_ifp->group_list); |
948 | assert(!listcount(pim_ifp->group_list)); | |
dda4d23c | 949 | |
ea7d74d7 SG |
950 | list_delete(&pim_ifp->group_list); |
951 | hash_free(pim_ifp->group_hash); | |
dda4d23c | 952 | |
ea7d74d7 | 953 | list_delete(&pim_ifp->socket_list); |
dda4d23c DL |
954 | } |
955 | ||
d62a17ae | 956 | static struct igmp_sock *igmp_sock_new(int fd, struct in_addr ifaddr, |
f83f3966 | 957 | struct interface *ifp, int mtrace_only) |
12e41d03 | 958 | { |
d62a17ae | 959 | struct pim_interface *pim_ifp; |
960 | struct igmp_sock *igmp; | |
961 | ||
962 | pim_ifp = ifp->info; | |
963 | ||
964 | if (PIM_DEBUG_IGMP_TRACE) { | |
965 | zlog_debug( | |
ee2bbf7c MS |
966 | "Creating IGMP socket fd=%d for address %pI4 on interface %s", |
967 | fd, &ifaddr, ifp->name); | |
d62a17ae | 968 | } |
969 | ||
970 | igmp = XCALLOC(MTYPE_PIM_IGMP_SOCKET, sizeof(*igmp)); | |
d62a17ae | 971 | |
d62a17ae | 972 | igmp->fd = fd; |
973 | igmp->interface = ifp; | |
974 | igmp->ifaddr = ifaddr; | |
9a7cee26 | 975 | igmp->querier_addr = ifaddr; |
d62a17ae | 976 | igmp->t_igmp_read = NULL; |
977 | igmp->t_igmp_query_timer = NULL; | |
978 | igmp->t_other_querier_timer = NULL; /* no other querier present */ | |
979 | igmp->querier_robustness_variable = | |
ea7d74d7 | 980 | pim_ifp->default_robustness_variable; |
d62a17ae | 981 | igmp->sock_creation = pim_time_monotonic_sec(); |
982 | ||
21313cbf MS |
983 | igmp_stats_init(&igmp->rx_stats); |
984 | ||
f83f3966 MS |
985 | if (mtrace_only) { |
986 | igmp->mtrace_only = mtrace_only; | |
987 | return igmp; | |
988 | } | |
989 | ||
990 | igmp->mtrace_only = false; | |
991 | ||
d62a17ae | 992 | /* |
993 | igmp_startup_mode_on() will reset QQI: | |
994 | ||
ea7d74d7 | 995 | igmp->querier_query_interval = pim_ifp->default_query_interval; |
d62a17ae | 996 | */ |
997 | igmp_startup_mode_on(igmp); | |
998 | pim_igmp_general_query_on(igmp); | |
999 | ||
1000 | return igmp; | |
12e41d03 DL |
1001 | } |
1002 | ||
d62a17ae | 1003 | static void igmp_read_on(struct igmp_sock *igmp); |
7923d317 | 1004 | |
d62a17ae | 1005 | static int pim_igmp_read(struct thread *t) |
7923d317 | 1006 | { |
d62a17ae | 1007 | uint8_t buf[10000]; |
1008 | struct igmp_sock *igmp = (struct igmp_sock *)THREAD_ARG(t); | |
1009 | struct sockaddr_in from; | |
1010 | struct sockaddr_in to; | |
1011 | socklen_t fromlen = sizeof(from); | |
1012 | socklen_t tolen = sizeof(to); | |
1013 | ifindex_t ifindex = -1; | |
d62a17ae | 1014 | int len; |
1015 | ||
2e1cc436 | 1016 | while (1) { |
d62a17ae | 1017 | len = pim_socket_recvfromto(igmp->fd, buf, sizeof(buf), &from, |
1018 | &fromlen, &to, &tolen, &ifindex); | |
1019 | if (len < 0) { | |
1020 | if (errno == EINTR) | |
1021 | continue; | |
1022 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
1023 | break; | |
1024 | ||
1025 | goto done; | |
1026 | } | |
7923d317 | 1027 | } |
7923d317 | 1028 | |
d62a17ae | 1029 | done: |
1030 | igmp_read_on(igmp); | |
1031 | return 0; | |
7923d317 DS |
1032 | } |
1033 | ||
d62a17ae | 1034 | static void igmp_read_on(struct igmp_sock *igmp) |
7923d317 DS |
1035 | { |
1036 | ||
d62a17ae | 1037 | if (PIM_DEBUG_IGMP_TRACE_DETAIL) { |
1038 | zlog_debug("Scheduling READ event on IGMP socket fd=%d", | |
1039 | igmp->fd); | |
1040 | } | |
36417fcc | 1041 | thread_add_read(router->master, pim_igmp_read, igmp, igmp->fd, |
d62a17ae | 1042 | &igmp->t_igmp_read); |
7923d317 DS |
1043 | } |
1044 | ||
12e41d03 DL |
1045 | struct igmp_sock *pim_igmp_sock_add(struct list *igmp_sock_list, |
1046 | struct in_addr ifaddr, | |
f83f3966 MS |
1047 | struct interface *ifp, |
1048 | bool mtrace_only) | |
12e41d03 | 1049 | { |
d62a17ae | 1050 | struct pim_interface *pim_ifp; |
1051 | struct igmp_sock *igmp; | |
d05d3f7a | 1052 | struct sockaddr_in sin; |
d62a17ae | 1053 | int fd; |
12e41d03 | 1054 | |
d62a17ae | 1055 | pim_ifp = ifp->info; |
12e41d03 | 1056 | |
d62a17ae | 1057 | fd = igmp_sock_open(ifaddr, ifp, pim_ifp->options); |
1058 | if (fd < 0) { | |
ee2bbf7c MS |
1059 | zlog_warn("Could not open IGMP socket for %pI4 on %s", |
1060 | &ifaddr, ifp->name); | |
d12f46fa | 1061 | return NULL; |
d62a17ae | 1062 | } |
12e41d03 | 1063 | |
d05d3f7a NB |
1064 | sin.sin_family = AF_INET; |
1065 | sin.sin_addr = ifaddr; | |
1066 | sin.sin_port = 0; | |
1067 | if (bind(fd, (struct sockaddr *) &sin, sizeof(sin)) != 0) { | |
262649bd DS |
1068 | zlog_warn("Could not bind IGMP socket for %pI4 on %s: %s(%d)", |
1069 | &ifaddr, ifp->name, strerror(errno), errno); | |
2c85fdd4 DS |
1070 | close(fd); |
1071 | ||
d12f46fa | 1072 | return NULL; |
d05d3f7a NB |
1073 | } |
1074 | ||
f83f3966 | 1075 | igmp = igmp_sock_new(fd, ifaddr, ifp, mtrace_only); |
12e41d03 | 1076 | |
d62a17ae | 1077 | igmp_read_on(igmp); |
7923d317 | 1078 | |
d62a17ae | 1079 | listnode_add(igmp_sock_list, igmp); |
12e41d03 DL |
1080 | |
1081 | #ifdef IGMP_SOCK_DUMP | |
d62a17ae | 1082 | igmp_sock_dump(igmp_sock_array); |
12e41d03 DL |
1083 | #endif |
1084 | ||
d62a17ae | 1085 | return igmp; |
12e41d03 DL |
1086 | } |
1087 | ||
1088 | /* | |
1089 | RFC 3376: 6.5. Switching Router Filter-Modes | |
1090 | ||
1091 | When a router's filter-mode for a group is EXCLUDE and the group | |
1092 | timer expires, the router filter-mode for the group transitions to | |
1093 | INCLUDE. | |
1094 | ||
1095 | A router uses source records with running source timers as its state | |
1096 | for the switch to a filter-mode of INCLUDE. If there are any source | |
1097 | records with source timers greater than zero (i.e., requested to be | |
1098 | forwarded), a router switches to filter-mode of INCLUDE using those | |
1099 | source records. Source records whose timers are zero (from the | |
1100 | previous EXCLUDE mode) are deleted. | |
1101 | */ | |
1102 | static int igmp_group_timer(struct thread *t) | |
1103 | { | |
d62a17ae | 1104 | struct igmp_group *group; |
12e41d03 | 1105 | |
d62a17ae | 1106 | group = THREAD_ARG(t); |
12e41d03 | 1107 | |
d62a17ae | 1108 | if (PIM_DEBUG_IGMP_TRACE) { |
1109 | char group_str[INET_ADDRSTRLEN]; | |
1110 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1111 | sizeof(group_str)); | |
15569c58 | 1112 | zlog_debug("%s: Timer for group %s on interface %s", __func__, |
dda4d23c | 1113 | group_str, group->interface->name); |
d62a17ae | 1114 | } |
12e41d03 | 1115 | |
df5dfb77 | 1116 | assert(group->group_filtermode_isexcl); |
12e41d03 | 1117 | |
d62a17ae | 1118 | group->group_filtermode_isexcl = 0; |
12e41d03 | 1119 | |
d62a17ae | 1120 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ |
1121 | igmp_anysource_forward_stop(group); | |
12e41d03 | 1122 | |
d62a17ae | 1123 | igmp_source_delete_expired(group->group_source_list); |
12e41d03 | 1124 | |
df5dfb77 | 1125 | assert(!group->group_filtermode_isexcl); |
12e41d03 | 1126 | |
d62a17ae | 1127 | /* |
1128 | RFC 3376: 6.2.2. Definition of Group Timers | |
12e41d03 | 1129 | |
d62a17ae | 1130 | If there are no more source records for the group, delete group |
1131 | record. | |
1132 | */ | |
1133 | if (listcount(group->group_source_list) < 1) { | |
1134 | igmp_group_delete_empty_include(group); | |
1135 | } | |
12e41d03 | 1136 | |
d62a17ae | 1137 | return 0; |
12e41d03 DL |
1138 | } |
1139 | ||
1140 | static void group_timer_off(struct igmp_group *group) | |
1141 | { | |
d62a17ae | 1142 | if (!group->t_group_timer) |
1143 | return; | |
1144 | ||
1145 | if (PIM_DEBUG_IGMP_TRACE) { | |
1146 | char group_str[INET_ADDRSTRLEN]; | |
1147 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1148 | sizeof(group_str)); | |
1149 | zlog_debug("Cancelling TIMER event for group %s on %s", | |
dda4d23c | 1150 | group_str, group->interface->name); |
d62a17ae | 1151 | } |
1152 | THREAD_OFF(group->t_group_timer); | |
12e41d03 DL |
1153 | } |
1154 | ||
d62a17ae | 1155 | void igmp_group_timer_on(struct igmp_group *group, long interval_msec, |
1156 | const char *ifname) | |
12e41d03 | 1157 | { |
d62a17ae | 1158 | group_timer_off(group); |
1159 | ||
1160 | if (PIM_DEBUG_IGMP_EVENTS) { | |
1161 | char group_str[INET_ADDRSTRLEN]; | |
1162 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1163 | sizeof(group_str)); | |
1164 | zlog_debug( | |
1165 | "Scheduling %ld.%03ld sec TIMER event for group %s on %s", | |
1166 | interval_msec / 1000, interval_msec % 1000, group_str, | |
1167 | ifname); | |
1168 | } | |
1169 | ||
1170 | /* | |
1171 | RFC 3376: 6.2.2. Definition of Group Timers | |
1172 | ||
1173 | The group timer is only used when a group is in EXCLUDE mode and | |
1174 | it represents the time for the *filter-mode* of the group to | |
1175 | expire and switch to INCLUDE mode. | |
1176 | */ | |
df5dfb77 | 1177 | assert(group->group_filtermode_isexcl); |
d62a17ae | 1178 | |
36417fcc DS |
1179 | thread_add_timer_msec(router->master, igmp_group_timer, group, |
1180 | interval_msec, &group->t_group_timer); | |
12e41d03 DL |
1181 | } |
1182 | ||
d62a17ae | 1183 | struct igmp_group *find_group_by_addr(struct igmp_sock *igmp, |
1184 | struct in_addr group_addr) | |
12e41d03 | 1185 | { |
d62a17ae | 1186 | struct igmp_group lookup; |
dda4d23c | 1187 | struct pim_interface *pim_ifp = igmp->interface->info; |
12e41d03 | 1188 | |
d62a17ae | 1189 | lookup.group_addr.s_addr = group_addr.s_addr; |
12e41d03 | 1190 | |
ea7d74d7 | 1191 | return hash_lookup(pim_ifp->group_hash, &lookup); |
12e41d03 DL |
1192 | } |
1193 | ||
1194 | struct igmp_group *igmp_add_group_by_addr(struct igmp_sock *igmp, | |
915c13b3 | 1195 | struct in_addr group_addr) |
12e41d03 | 1196 | { |
d62a17ae | 1197 | struct igmp_group *group; |
dda4d23c | 1198 | struct pim_interface *pim_ifp = igmp->interface->info; |
d62a17ae | 1199 | |
1200 | group = find_group_by_addr(igmp, group_addr); | |
1201 | if (group) { | |
1202 | return group; | |
1203 | } | |
1204 | ||
1205 | if (!pim_is_group_224_4(group_addr)) { | |
1206 | zlog_warn("%s: Group Specified is not part of 224.0.0.0/4", | |
15569c58 | 1207 | __func__); |
d62a17ae | 1208 | return NULL; |
1209 | } | |
1210 | ||
1211 | if (pim_is_group_224_0_0_0_24(group_addr)) { | |
6b5122a0 DS |
1212 | if (PIM_DEBUG_IGMP_TRACE) |
1213 | zlog_debug( | |
ee2bbf7c MS |
1214 | "%s: Group specified %pI4 is part of 224.0.0.0/24", |
1215 | __func__, &group_addr); | |
d62a17ae | 1216 | return NULL; |
1217 | } | |
1218 | /* | |
1219 | Non-existant group is created as INCLUDE {empty}: | |
1220 | ||
1221 | RFC 3376 - 5.1. Action on Change of Interface State | |
1222 | ||
1223 | If no interface state existed for that multicast address before | |
1224 | the change (i.e., the change consisted of creating a new | |
1225 | per-interface record), or if no state exists after the change | |
1226 | (i.e., the change consisted of deleting a per-interface record), | |
1227 | then the "non-existent" state is considered to have a filter mode | |
1228 | of INCLUDE and an empty source list. | |
1229 | */ | |
1230 | ||
1231 | group = XCALLOC(MTYPE_PIM_IGMP_GROUP, sizeof(*group)); | |
d62a17ae | 1232 | |
1233 | group->group_source_list = list_new(); | |
d62a17ae | 1234 | group->group_source_list->del = (void (*)(void *))igmp_source_free; |
1235 | ||
1236 | group->t_group_timer = NULL; | |
1237 | group->t_group_query_retransmit_timer = NULL; | |
1238 | group->group_specific_query_retransmit_count = 0; | |
1239 | group->group_addr = group_addr; | |
dda4d23c | 1240 | group->interface = igmp->interface; |
d62a17ae | 1241 | group->last_igmp_v1_report_dsec = -1; |
1242 | group->last_igmp_v2_report_dsec = -1; | |
1243 | group->group_creation = pim_time_monotonic_sec(); | |
1244 | group->igmp_version = IGMP_DEFAULT_VERSION; | |
1245 | ||
1246 | /* initialize new group as INCLUDE {empty} */ | |
1247 | group->group_filtermode_isexcl = 0; /* 0=INCLUDE, 1=EXCLUDE */ | |
1248 | ||
ea7d74d7 SG |
1249 | listnode_add(pim_ifp->group_list, group); |
1250 | group = hash_get(pim_ifp->group_hash, group, hash_alloc_intern); | |
d62a17ae | 1251 | |
1252 | if (PIM_DEBUG_IGMP_TRACE) { | |
1253 | char group_str[INET_ADDRSTRLEN]; | |
1254 | pim_inet4_dump("<group?>", group->group_addr, group_str, | |
1255 | sizeof(group_str)); | |
1256 | zlog_debug( | |
1257 | "Creating new IGMP group %s on socket %d interface %s", | |
1258 | group_str, igmp->fd, igmp->interface->name); | |
1259 | } | |
1260 | ||
dda4d23c | 1261 | igmp_group_count_incr(pim_ifp); |
339f7695 | 1262 | |
d62a17ae | 1263 | /* |
1264 | RFC 3376: 6.2.2. Definition of Group Timers | |
1265 | ||
1266 | The group timer is only used when a group is in EXCLUDE mode and | |
1267 | it represents the time for the *filter-mode* of the group to | |
1268 | expire and switch to INCLUDE mode. | |
1269 | */ | |
df5dfb77 DL |
1270 | assert(!group->group_filtermode_isexcl); /* INCLUDE mode */ |
1271 | assert(!group->t_group_timer); /* group timer == 0 */ | |
d62a17ae | 1272 | |
1273 | /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */ | |
1274 | igmp_anysource_forward_stop(group); | |
1275 | ||
1276 | return group; | |
12e41d03 | 1277 | } |
b05b72e8 | 1278 | |
d62a17ae | 1279 | void igmp_send_query(int igmp_version, struct igmp_group *group, int fd, |
1280 | const char *ifname, char *query_buf, int query_buf_size, | |
1281 | int num_sources, struct in_addr dst_addr, | |
1282 | struct in_addr group_addr, | |
1283 | int query_max_response_time_dsec, uint8_t s_flag, | |
1284 | uint8_t querier_robustness_variable, | |
1285 | uint16_t querier_query_interval) | |
b05b72e8 | 1286 | { |
d62a17ae | 1287 | if (igmp_version == 3) { |
1288 | igmp_v3_send_query(group, fd, ifname, query_buf, query_buf_size, | |
1289 | num_sources, dst_addr, group_addr, | |
1290 | query_max_response_time_dsec, s_flag, | |
1291 | querier_robustness_variable, | |
1292 | querier_query_interval); | |
1293 | } else if (igmp_version == 2) { | |
1294 | igmp_v2_send_query(group, fd, ifname, query_buf, dst_addr, | |
1295 | group_addr, query_max_response_time_dsec); | |
1296 | } | |
b05b72e8 | 1297 | } |
6741a5bb | 1298 | |
1299 | void igmp_send_query_on_intf(struct interface *ifp, int igmp_ver) | |
1300 | { | |
1301 | struct pim_interface *pim_ifp = ifp->info; | |
1302 | struct listnode *sock_node = NULL; | |
1303 | struct igmp_sock *igmp = NULL; | |
1304 | struct in_addr dst_addr; | |
1305 | struct in_addr group_addr; | |
1306 | int query_buf_size; | |
1307 | ||
1308 | if (!igmp_ver) | |
1309 | igmp_ver = 2; | |
1310 | ||
1311 | if (igmp_ver == 3) | |
1312 | query_buf_size = PIM_IGMP_BUFSIZE_WRITE; | |
1313 | else | |
1314 | query_buf_size = IGMP_V12_MSG_SIZE; | |
1315 | ||
1316 | dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); | |
1317 | group_addr.s_addr = PIM_NET_INADDR_ANY; | |
1318 | ||
1319 | if (PIM_DEBUG_IGMP_TRACE) | |
1320 | zlog_debug("Issuing general query on request on %s", | |
1321 | ifp->name); | |
1322 | ||
ea7d74d7 | 1323 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->socket_list, sock_node, igmp)) { |
6741a5bb | 1324 | |
1325 | char query_buf[query_buf_size]; | |
1326 | ||
1327 | igmp_send_query(igmp_ver, 0 /* igmp_group */, igmp->fd, | |
1328 | igmp->interface->name, query_buf, | |
1329 | sizeof(query_buf), 0 /* num_sources */, | |
1330 | dst_addr, group_addr, | |
ea7d74d7 | 1331 | pim_ifp->query_max_response_time_dsec, |
6741a5bb | 1332 | 1 /* s_flag: always set for general queries */, |
1333 | igmp->querier_robustness_variable, | |
1334 | igmp->querier_query_interval); | |
1335 | } | |
1336 | } |