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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 "if.h" | |
23 | #include "log.h" | |
24 | #include "memory.h" | |
c5bdb09f | 25 | #include "sockopt.h" |
7e2b7603 | 26 | #include "vrf.h" |
12e41d03 | 27 | |
8bfb8b67 | 28 | #include "pimd.h" |
12e41d03 DL |
29 | #include "pim_ssmpingd.h" |
30 | #include "pim_time.h" | |
31 | #include "pim_sock.h" | |
12e41d03 | 32 | |
d62a17ae | 33 | static const char *const PIM_SSMPINGD_REPLY_GROUP = "232.43.211.234"; |
12e41d03 | 34 | |
d62a17ae | 35 | enum { PIM_SSMPINGD_REQUEST = 'Q', PIM_SSMPINGD_REPLY = 'A' }; |
12e41d03 DL |
36 | |
37 | static void ssmpingd_read_on(struct ssmpingd_sock *ss); | |
38 | ||
71ad9915 | 39 | void pim_ssmpingd_init(struct pim_instance *pim) |
12e41d03 | 40 | { |
d62a17ae | 41 | int result; |
12e41d03 | 42 | |
71ad9915 | 43 | zassert(!pim->ssmpingd_list); |
12e41d03 | 44 | |
d62a17ae | 45 | result = inet_pton(AF_INET, PIM_SSMPINGD_REPLY_GROUP, |
71ad9915 | 46 | &pim->ssmpingd_group_addr); |
d62a17ae | 47 | |
48 | zassert(result > 0); | |
12e41d03 DL |
49 | } |
50 | ||
71ad9915 | 51 | void pim_ssmpingd_destroy(struct pim_instance *pim) |
12e41d03 | 52 | { |
71ad9915 | 53 | if (pim->ssmpingd_list) { |
69ccd63e | 54 | list_delete(pim->ssmpingd_list); |
71ad9915 | 55 | pim->ssmpingd_list = 0; |
d62a17ae | 56 | } |
12e41d03 DL |
57 | } |
58 | ||
71ad9915 DS |
59 | static struct ssmpingd_sock *ssmpingd_find(struct pim_instance *pim, |
60 | struct in_addr source_addr) | |
12e41d03 | 61 | { |
d62a17ae | 62 | struct listnode *node; |
63 | struct ssmpingd_sock *ss; | |
12e41d03 | 64 | |
71ad9915 | 65 | if (!pim->ssmpingd_list) |
d62a17ae | 66 | return 0; |
12e41d03 | 67 | |
71ad9915 | 68 | for (ALL_LIST_ELEMENTS_RO(pim->ssmpingd_list, node, ss)) |
d62a17ae | 69 | if (source_addr.s_addr == ss->source_addr.s_addr) |
70 | return ss; | |
12e41d03 | 71 | |
d62a17ae | 72 | return 0; |
12e41d03 DL |
73 | } |
74 | ||
75 | static void ssmpingd_free(struct ssmpingd_sock *ss) | |
76 | { | |
d62a17ae | 77 | XFREE(MTYPE_PIM_SSMPINGD, ss); |
12e41d03 DL |
78 | } |
79 | ||
80 | static int ssmpingd_socket(struct in_addr addr, int port, int mttl) | |
81 | { | |
d62a17ae | 82 | struct sockaddr_in sockaddr; |
83 | int fd; | |
84 | ||
85 | fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); | |
86 | if (fd < 0) { | |
87 | zlog_err("%s: could not create socket: errno=%d: %s", | |
88 | __PRETTY_FUNCTION__, errno, safe_strerror(errno)); | |
89 | return -1; | |
90 | } | |
91 | ||
92 | sockaddr.sin_family = AF_INET; | |
93 | sockaddr.sin_addr = addr; | |
94 | sockaddr.sin_port = htons(port); | |
95 | ||
96 | if (bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr))) { | |
97 | char addr_str[INET_ADDRSTRLEN]; | |
98 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); | |
99 | zlog_warn( | |
100 | "%s: bind(fd=%d,addr=%s,port=%d,len=%zu) failure: errno=%d: %s", | |
101 | __PRETTY_FUNCTION__, fd, addr_str, port, | |
102 | sizeof(sockaddr), errno, safe_strerror(errno)); | |
103 | close(fd); | |
104 | return -1; | |
105 | } | |
106 | ||
107 | /* Needed to obtain destination address from recvmsg() */ | |
108 | { | |
12e41d03 | 109 | #if defined(HAVE_IP_PKTINFO) |
d62a17ae | 110 | /* Linux and Solaris IP_PKTINFO */ |
111 | int opt = 1; | |
112 | if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &opt, sizeof(opt))) { | |
113 | zlog_warn( | |
114 | "%s: could not set IP_PKTINFO on socket fd=%d: errno=%d: %s", | |
115 | __PRETTY_FUNCTION__, fd, errno, | |
116 | safe_strerror(errno)); | |
117 | } | |
12e41d03 | 118 | #elif defined(HAVE_IP_RECVDSTADDR) |
d62a17ae | 119 | /* BSD IP_RECVDSTADDR */ |
120 | int opt = 1; | |
121 | if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &opt, | |
122 | sizeof(opt))) { | |
123 | zlog_warn( | |
124 | "%s: could not set IP_RECVDSTADDR on socket fd=%d: errno=%d: %s", | |
125 | __PRETTY_FUNCTION__, fd, errno, | |
126 | safe_strerror(errno)); | |
127 | } | |
12e41d03 | 128 | #else |
d62a17ae | 129 | zlog_err( |
130 | "%s %s: missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()", | |
131 | __FILE__, __PRETTY_FUNCTION__); | |
132 | close(fd); | |
133 | return -1; | |
12e41d03 | 134 | #endif |
d62a17ae | 135 | } |
136 | ||
137 | { | |
138 | int reuse = 1; | |
139 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&reuse, | |
140 | sizeof(reuse))) { | |
141 | zlog_warn( | |
142 | "%s: could not set Reuse Address Option on socket fd=%d: errno=%d: %s", | |
143 | __PRETTY_FUNCTION__, fd, errno, | |
144 | safe_strerror(errno)); | |
145 | close(fd); | |
146 | return -1; | |
147 | } | |
148 | } | |
149 | ||
150 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&mttl, | |
151 | sizeof(mttl))) { | |
152 | zlog_warn( | |
153 | "%s: could not set multicast TTL=%d on socket fd=%d: errno=%d: %s", | |
154 | __PRETTY_FUNCTION__, mttl, fd, errno, | |
155 | safe_strerror(errno)); | |
156 | close(fd); | |
157 | return -1; | |
158 | } | |
159 | ||
160 | if (setsockopt_ipv4_multicast_loop(fd, 0)) { | |
161 | zlog_warn( | |
162 | "%s: could not disable Multicast Loopback Option on socket fd=%d: errno=%d: %s", | |
163 | __PRETTY_FUNCTION__, fd, errno, safe_strerror(errno)); | |
164 | close(fd); | |
165 | return PIM_SOCK_ERR_LOOP; | |
166 | } | |
167 | ||
168 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, (void *)&addr, | |
169 | sizeof(addr))) { | |
170 | zlog_warn( | |
171 | "%s: could not set Outgoing Interface Option on socket fd=%d: errno=%d: %s", | |
172 | __PRETTY_FUNCTION__, fd, errno, safe_strerror(errno)); | |
173 | close(fd); | |
174 | return -1; | |
175 | } | |
176 | ||
177 | { | |
178 | long flags; | |
179 | ||
180 | flags = fcntl(fd, F_GETFL, 0); | |
181 | if (flags < 0) { | |
182 | zlog_warn( | |
183 | "%s: could not get fcntl(F_GETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s", | |
184 | __PRETTY_FUNCTION__, fd, errno, | |
185 | safe_strerror(errno)); | |
186 | close(fd); | |
187 | return -1; | |
188 | } | |
189 | ||
190 | if (fcntl(fd, F_SETFL, flags | O_NONBLOCK)) { | |
191 | zlog_warn( | |
192 | "%s: could not set fcntl(F_SETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s", | |
193 | __PRETTY_FUNCTION__, fd, errno, | |
194 | safe_strerror(errno)); | |
195 | close(fd); | |
196 | return -1; | |
197 | } | |
198 | } | |
199 | ||
200 | return fd; | |
12e41d03 DL |
201 | } |
202 | ||
203 | static void ssmpingd_delete(struct ssmpingd_sock *ss) | |
204 | { | |
d62a17ae | 205 | zassert(ss); |
d62a17ae | 206 | |
207 | THREAD_OFF(ss->t_sock_read); | |
208 | ||
209 | if (close(ss->sock_fd)) { | |
210 | char source_str[INET_ADDRSTRLEN]; | |
211 | pim_inet4_dump("<src?>", ss->source_addr, source_str, | |
212 | sizeof(source_str)); | |
213 | zlog_warn( | |
214 | "%s: failure closing ssmpingd sock_fd=%d for source %s: errno=%d: %s", | |
215 | __PRETTY_FUNCTION__, ss->sock_fd, source_str, errno, | |
216 | safe_strerror(errno)); | |
217 | /* warning only */ | |
218 | } | |
219 | ||
71ad9915 | 220 | listnode_delete(ss->pim->ssmpingd_list, ss); |
d62a17ae | 221 | ssmpingd_free(ss); |
12e41d03 DL |
222 | } |
223 | ||
d62a17ae | 224 | static void ssmpingd_sendto(struct ssmpingd_sock *ss, const uint8_t *buf, |
225 | int len, struct sockaddr_in to) | |
12e41d03 | 226 | { |
d62a17ae | 227 | socklen_t tolen = sizeof(to); |
228 | int sent; | |
229 | ||
230 | sent = sendto(ss->sock_fd, buf, len, MSG_DONTWAIT, | |
231 | (struct sockaddr *)&to, tolen); | |
232 | if (sent != len) { | |
233 | char to_str[INET_ADDRSTRLEN]; | |
234 | pim_inet4_dump("<to?>", to.sin_addr, to_str, sizeof(to_str)); | |
235 | if (sent < 0) { | |
236 | zlog_warn( | |
237 | "%s: sendto() failure to %s,%d: fd=%d len=%d: errno=%d: %s", | |
238 | __PRETTY_FUNCTION__, to_str, ntohs(to.sin_port), | |
239 | ss->sock_fd, len, errno, safe_strerror(errno)); | |
240 | } else { | |
241 | zlog_warn( | |
242 | "%s: sendto() partial to %s,%d: fd=%d len=%d: sent=%d", | |
243 | __PRETTY_FUNCTION__, to_str, ntohs(to.sin_port), | |
244 | ss->sock_fd, len, sent); | |
245 | } | |
246 | } | |
12e41d03 DL |
247 | } |
248 | ||
249 | static int ssmpingd_read_msg(struct ssmpingd_sock *ss) | |
250 | { | |
d62a17ae | 251 | struct interface *ifp; |
252 | struct sockaddr_in from; | |
253 | struct sockaddr_in to; | |
254 | socklen_t fromlen = sizeof(from); | |
255 | socklen_t tolen = sizeof(to); | |
256 | ifindex_t ifindex = -1; | |
257 | uint8_t buf[1000]; | |
258 | int len; | |
259 | ||
260 | ++ss->requests; | |
261 | ||
262 | len = pim_socket_recvfromto(ss->sock_fd, buf, sizeof(buf), &from, | |
263 | &fromlen, &to, &tolen, &ifindex); | |
264 | if (len < 0) { | |
265 | char source_str[INET_ADDRSTRLEN]; | |
266 | pim_inet4_dump("<src?>", ss->source_addr, source_str, | |
267 | sizeof(source_str)); | |
268 | zlog_warn( | |
269 | "%s: failure receiving ssmping for source %s on fd=%d: errno=%d: %s", | |
270 | __PRETTY_FUNCTION__, source_str, ss->sock_fd, errno, | |
271 | safe_strerror(errno)); | |
272 | return -1; | |
273 | } | |
274 | ||
71ad9915 | 275 | ifp = if_lookup_by_index(ifindex, ss->pim->vrf_id); |
d62a17ae | 276 | |
277 | if (buf[0] != PIM_SSMPINGD_REQUEST) { | |
278 | char source_str[INET_ADDRSTRLEN]; | |
279 | char from_str[INET_ADDRSTRLEN]; | |
280 | char to_str[INET_ADDRSTRLEN]; | |
281 | pim_inet4_dump("<src?>", ss->source_addr, source_str, | |
282 | sizeof(source_str)); | |
283 | pim_inet4_dump("<from?>", from.sin_addr, from_str, | |
284 | sizeof(from_str)); | |
285 | pim_inet4_dump("<to?>", to.sin_addr, to_str, sizeof(to_str)); | |
286 | zlog_warn( | |
287 | "%s: bad ssmping type=%d from %s,%d to %s,%d on interface %s ifindex=%d fd=%d src=%s", | |
288 | __PRETTY_FUNCTION__, buf[0], from_str, | |
289 | ntohs(from.sin_port), to_str, ntohs(to.sin_port), | |
290 | ifp ? ifp->name : "<iface?>", ifindex, ss->sock_fd, | |
291 | source_str); | |
292 | return 0; | |
293 | } | |
294 | ||
295 | if (PIM_DEBUG_SSMPINGD) { | |
296 | char source_str[INET_ADDRSTRLEN]; | |
297 | char from_str[INET_ADDRSTRLEN]; | |
298 | char to_str[INET_ADDRSTRLEN]; | |
299 | pim_inet4_dump("<src?>", ss->source_addr, source_str, | |
300 | sizeof(source_str)); | |
301 | pim_inet4_dump("<from?>", from.sin_addr, from_str, | |
302 | sizeof(from_str)); | |
303 | pim_inet4_dump("<to?>", to.sin_addr, to_str, sizeof(to_str)); | |
304 | zlog_debug( | |
305 | "%s: recv ssmping from %s,%d to %s,%d on interface %s ifindex=%d fd=%d src=%s", | |
306 | __PRETTY_FUNCTION__, from_str, ntohs(from.sin_port), | |
307 | to_str, ntohs(to.sin_port), | |
308 | ifp ? ifp->name : "<iface?>", ifindex, ss->sock_fd, | |
309 | source_str); | |
310 | } | |
311 | ||
312 | buf[0] = PIM_SSMPINGD_REPLY; | |
313 | ||
314 | /* unicast reply */ | |
315 | ssmpingd_sendto(ss, buf, len, from); | |
316 | ||
317 | /* multicast reply */ | |
71ad9915 | 318 | from.sin_addr = ss->pim->ssmpingd_group_addr; |
d62a17ae | 319 | ssmpingd_sendto(ss, buf, len, from); |
320 | ||
321 | return 0; | |
12e41d03 DL |
322 | } |
323 | ||
324 | static int ssmpingd_sock_read(struct thread *t) | |
325 | { | |
d62a17ae | 326 | struct ssmpingd_sock *ss; |
327 | int result; | |
12e41d03 | 328 | |
d62a17ae | 329 | ss = THREAD_ARG(t); |
12e41d03 | 330 | |
d62a17ae | 331 | result = ssmpingd_read_msg(ss); |
12e41d03 | 332 | |
d62a17ae | 333 | /* Keep reading */ |
334 | ssmpingd_read_on(ss); | |
12e41d03 | 335 | |
d62a17ae | 336 | return result; |
12e41d03 DL |
337 | } |
338 | ||
339 | static void ssmpingd_read_on(struct ssmpingd_sock *ss) | |
340 | { | |
d62a17ae | 341 | thread_add_read(master, ssmpingd_sock_read, ss, ss->sock_fd, |
342 | &ss->t_sock_read); | |
12e41d03 DL |
343 | } |
344 | ||
71ad9915 DS |
345 | static struct ssmpingd_sock *ssmpingd_new(struct pim_instance *pim, |
346 | struct in_addr source_addr) | |
12e41d03 | 347 | { |
d62a17ae | 348 | struct ssmpingd_sock *ss; |
349 | int sock_fd; | |
350 | ||
71ad9915 DS |
351 | if (!pim->ssmpingd_list) { |
352 | pim->ssmpingd_list = list_new(); | |
353 | if (!pim->ssmpingd_list) { | |
d62a17ae | 354 | zlog_err( |
355 | "%s %s: failure: qpim_ssmpingd_list=list_new()", | |
356 | __FILE__, __PRETTY_FUNCTION__); | |
357 | return 0; | |
358 | } | |
71ad9915 | 359 | pim->ssmpingd_list->del = (void (*)(void *))ssmpingd_free; |
d62a17ae | 360 | } |
361 | ||
362 | sock_fd = | |
363 | ssmpingd_socket(source_addr, /* port: */ 4321, /* mTTL: */ 64); | |
364 | if (sock_fd < 0) { | |
365 | char source_str[INET_ADDRSTRLEN]; | |
366 | pim_inet4_dump("<src?>", source_addr, source_str, | |
367 | sizeof(source_str)); | |
368 | zlog_warn("%s: ssmpingd_socket() failure for source %s", | |
369 | __PRETTY_FUNCTION__, source_str); | |
370 | return 0; | |
371 | } | |
372 | ||
373 | ss = XCALLOC(MTYPE_PIM_SSMPINGD, sizeof(*ss)); | |
374 | if (!ss) { | |
375 | char source_str[INET_ADDRSTRLEN]; | |
376 | pim_inet4_dump("<src?>", source_addr, source_str, | |
377 | sizeof(source_str)); | |
378 | zlog_err("%s: XCALLOC(%zu) failure for ssmpingd source %s", | |
379 | __PRETTY_FUNCTION__, sizeof(*ss), source_str); | |
380 | close(sock_fd); | |
381 | return 0; | |
382 | } | |
383 | ||
71ad9915 | 384 | ss->pim = pim; |
d62a17ae | 385 | ss->sock_fd = sock_fd; |
386 | ss->t_sock_read = NULL; | |
387 | ss->source_addr = source_addr; | |
388 | ss->creation = pim_time_monotonic_sec(); | |
389 | ss->requests = 0; | |
390 | ||
71ad9915 | 391 | listnode_add(pim->ssmpingd_list, ss); |
d62a17ae | 392 | |
393 | ssmpingd_read_on(ss); | |
394 | ||
395 | return ss; | |
12e41d03 DL |
396 | } |
397 | ||
71ad9915 | 398 | int pim_ssmpingd_start(struct pim_instance *pim, struct in_addr source_addr) |
12e41d03 | 399 | { |
d62a17ae | 400 | struct ssmpingd_sock *ss; |
401 | ||
71ad9915 | 402 | ss = ssmpingd_find(pim, source_addr); |
d62a17ae | 403 | if (ss) { |
404 | /* silently ignore request to recreate entry */ | |
405 | return 0; | |
406 | } | |
407 | ||
408 | { | |
409 | char source_str[INET_ADDRSTRLEN]; | |
410 | pim_inet4_dump("<src?>", source_addr, source_str, | |
411 | sizeof(source_str)); | |
412 | zlog_info("%s: starting ssmpingd for source %s", | |
413 | __PRETTY_FUNCTION__, source_str); | |
414 | } | |
415 | ||
71ad9915 | 416 | ss = ssmpingd_new(pim, source_addr); |
d62a17ae | 417 | if (!ss) { |
418 | char source_str[INET_ADDRSTRLEN]; | |
419 | pim_inet4_dump("<src?>", source_addr, source_str, | |
420 | sizeof(source_str)); | |
421 | zlog_warn("%s: ssmpingd_new() failure for source %s", | |
422 | __PRETTY_FUNCTION__, source_str); | |
423 | return -1; | |
424 | } | |
425 | ||
426 | return 0; | |
12e41d03 DL |
427 | } |
428 | ||
71ad9915 | 429 | int pim_ssmpingd_stop(struct pim_instance *pim, struct in_addr source_addr) |
12e41d03 | 430 | { |
d62a17ae | 431 | struct ssmpingd_sock *ss; |
432 | ||
71ad9915 | 433 | ss = ssmpingd_find(pim, source_addr); |
d62a17ae | 434 | if (!ss) { |
435 | char source_str[INET_ADDRSTRLEN]; | |
436 | pim_inet4_dump("<src?>", source_addr, source_str, | |
437 | sizeof(source_str)); | |
438 | zlog_warn("%s: could not find ssmpingd for source %s", | |
439 | __PRETTY_FUNCTION__, source_str); | |
440 | return -1; | |
441 | } | |
442 | ||
443 | { | |
444 | char source_str[INET_ADDRSTRLEN]; | |
445 | pim_inet4_dump("<src?>", source_addr, source_str, | |
446 | sizeof(source_str)); | |
447 | zlog_info("%s: stopping ssmpingd for source %s", | |
448 | __PRETTY_FUNCTION__, source_str); | |
449 | } | |
450 | ||
451 | ssmpingd_delete(ss); | |
452 | ||
453 | return 0; | |
12e41d03 | 454 | } |