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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 | { |
affe9e99 DS |
53 | if (pim->ssmpingd_list) |
54 | list_delete_and_null(&pim->ssmpingd_list); | |
12e41d03 DL |
55 | } |
56 | ||
71ad9915 DS |
57 | static struct ssmpingd_sock *ssmpingd_find(struct pim_instance *pim, |
58 | struct in_addr source_addr) | |
12e41d03 | 59 | { |
d62a17ae | 60 | struct listnode *node; |
61 | struct ssmpingd_sock *ss; | |
12e41d03 | 62 | |
71ad9915 | 63 | if (!pim->ssmpingd_list) |
d62a17ae | 64 | return 0; |
12e41d03 | 65 | |
71ad9915 | 66 | for (ALL_LIST_ELEMENTS_RO(pim->ssmpingd_list, node, ss)) |
d62a17ae | 67 | if (source_addr.s_addr == ss->source_addr.s_addr) |
68 | return ss; | |
12e41d03 | 69 | |
d62a17ae | 70 | return 0; |
12e41d03 DL |
71 | } |
72 | ||
73 | static void ssmpingd_free(struct ssmpingd_sock *ss) | |
74 | { | |
d62a17ae | 75 | XFREE(MTYPE_PIM_SSMPINGD, ss); |
12e41d03 DL |
76 | } |
77 | ||
78 | static int ssmpingd_socket(struct in_addr addr, int port, int mttl) | |
79 | { | |
d62a17ae | 80 | struct sockaddr_in sockaddr; |
81 | int fd; | |
82 | ||
83 | fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); | |
84 | if (fd < 0) { | |
85 | zlog_err("%s: could not create socket: errno=%d: %s", | |
86 | __PRETTY_FUNCTION__, errno, safe_strerror(errno)); | |
87 | return -1; | |
88 | } | |
89 | ||
90 | sockaddr.sin_family = AF_INET; | |
91 | sockaddr.sin_addr = addr; | |
92 | sockaddr.sin_port = htons(port); | |
93 | ||
94 | if (bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr))) { | |
95 | char addr_str[INET_ADDRSTRLEN]; | |
96 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); | |
97 | zlog_warn( | |
98 | "%s: bind(fd=%d,addr=%s,port=%d,len=%zu) failure: errno=%d: %s", | |
99 | __PRETTY_FUNCTION__, fd, addr_str, port, | |
100 | sizeof(sockaddr), errno, safe_strerror(errno)); | |
101 | close(fd); | |
102 | return -1; | |
103 | } | |
104 | ||
105 | /* Needed to obtain destination address from recvmsg() */ | |
106 | { | |
12e41d03 | 107 | #if defined(HAVE_IP_PKTINFO) |
d62a17ae | 108 | /* Linux and Solaris IP_PKTINFO */ |
109 | int opt = 1; | |
110 | if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &opt, sizeof(opt))) { | |
111 | zlog_warn( | |
112 | "%s: could not set IP_PKTINFO on socket fd=%d: errno=%d: %s", | |
113 | __PRETTY_FUNCTION__, fd, errno, | |
114 | safe_strerror(errno)); | |
115 | } | |
12e41d03 | 116 | #elif defined(HAVE_IP_RECVDSTADDR) |
d62a17ae | 117 | /* BSD IP_RECVDSTADDR */ |
118 | int opt = 1; | |
119 | if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &opt, | |
120 | sizeof(opt))) { | |
121 | zlog_warn( | |
122 | "%s: could not set IP_RECVDSTADDR on socket fd=%d: errno=%d: %s", | |
123 | __PRETTY_FUNCTION__, fd, errno, | |
124 | safe_strerror(errno)); | |
125 | } | |
12e41d03 | 126 | #else |
d62a17ae | 127 | zlog_err( |
128 | "%s %s: missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()", | |
129 | __FILE__, __PRETTY_FUNCTION__); | |
130 | close(fd); | |
131 | return -1; | |
12e41d03 | 132 | #endif |
d62a17ae | 133 | } |
134 | ||
135 | { | |
136 | int reuse = 1; | |
137 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&reuse, | |
138 | sizeof(reuse))) { | |
139 | zlog_warn( | |
140 | "%s: could not set Reuse Address Option on socket fd=%d: errno=%d: %s", | |
141 | __PRETTY_FUNCTION__, fd, errno, | |
142 | safe_strerror(errno)); | |
143 | close(fd); | |
144 | return -1; | |
145 | } | |
146 | } | |
147 | ||
148 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&mttl, | |
149 | sizeof(mttl))) { | |
150 | zlog_warn( | |
151 | "%s: could not set multicast TTL=%d on socket fd=%d: errno=%d: %s", | |
152 | __PRETTY_FUNCTION__, mttl, fd, errno, | |
153 | safe_strerror(errno)); | |
154 | close(fd); | |
155 | return -1; | |
156 | } | |
157 | ||
158 | if (setsockopt_ipv4_multicast_loop(fd, 0)) { | |
159 | zlog_warn( | |
160 | "%s: could not disable Multicast Loopback Option on socket fd=%d: errno=%d: %s", | |
161 | __PRETTY_FUNCTION__, fd, errno, safe_strerror(errno)); | |
162 | close(fd); | |
163 | return PIM_SOCK_ERR_LOOP; | |
164 | } | |
165 | ||
166 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, (void *)&addr, | |
167 | sizeof(addr))) { | |
168 | zlog_warn( | |
169 | "%s: could not set Outgoing Interface Option on socket fd=%d: errno=%d: %s", | |
170 | __PRETTY_FUNCTION__, fd, errno, safe_strerror(errno)); | |
171 | close(fd); | |
172 | return -1; | |
173 | } | |
174 | ||
175 | { | |
176 | long flags; | |
177 | ||
178 | flags = fcntl(fd, F_GETFL, 0); | |
179 | if (flags < 0) { | |
180 | zlog_warn( | |
181 | "%s: could not get fcntl(F_GETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s", | |
182 | __PRETTY_FUNCTION__, fd, errno, | |
183 | safe_strerror(errno)); | |
184 | close(fd); | |
185 | return -1; | |
186 | } | |
187 | ||
188 | if (fcntl(fd, F_SETFL, flags | O_NONBLOCK)) { | |
189 | zlog_warn( | |
190 | "%s: could not set fcntl(F_SETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s", | |
191 | __PRETTY_FUNCTION__, fd, errno, | |
192 | safe_strerror(errno)); | |
193 | close(fd); | |
194 | return -1; | |
195 | } | |
196 | } | |
197 | ||
198 | return fd; | |
12e41d03 DL |
199 | } |
200 | ||
201 | static void ssmpingd_delete(struct ssmpingd_sock *ss) | |
202 | { | |
d62a17ae | 203 | zassert(ss); |
d62a17ae | 204 | |
205 | THREAD_OFF(ss->t_sock_read); | |
206 | ||
207 | if (close(ss->sock_fd)) { | |
208 | char source_str[INET_ADDRSTRLEN]; | |
209 | pim_inet4_dump("<src?>", ss->source_addr, source_str, | |
210 | sizeof(source_str)); | |
211 | zlog_warn( | |
212 | "%s: failure closing ssmpingd sock_fd=%d for source %s: errno=%d: %s", | |
213 | __PRETTY_FUNCTION__, ss->sock_fd, source_str, errno, | |
214 | safe_strerror(errno)); | |
215 | /* warning only */ | |
216 | } | |
217 | ||
71ad9915 | 218 | listnode_delete(ss->pim->ssmpingd_list, ss); |
d62a17ae | 219 | ssmpingd_free(ss); |
12e41d03 DL |
220 | } |
221 | ||
d62a17ae | 222 | static void ssmpingd_sendto(struct ssmpingd_sock *ss, const uint8_t *buf, |
223 | int len, struct sockaddr_in to) | |
12e41d03 | 224 | { |
d62a17ae | 225 | socklen_t tolen = sizeof(to); |
226 | int sent; | |
227 | ||
228 | sent = sendto(ss->sock_fd, buf, len, MSG_DONTWAIT, | |
229 | (struct sockaddr *)&to, tolen); | |
230 | if (sent != len) { | |
231 | char to_str[INET_ADDRSTRLEN]; | |
232 | pim_inet4_dump("<to?>", to.sin_addr, to_str, sizeof(to_str)); | |
233 | if (sent < 0) { | |
234 | zlog_warn( | |
235 | "%s: sendto() failure to %s,%d: fd=%d len=%d: errno=%d: %s", | |
236 | __PRETTY_FUNCTION__, to_str, ntohs(to.sin_port), | |
237 | ss->sock_fd, len, errno, safe_strerror(errno)); | |
238 | } else { | |
239 | zlog_warn( | |
240 | "%s: sendto() partial to %s,%d: fd=%d len=%d: sent=%d", | |
241 | __PRETTY_FUNCTION__, to_str, ntohs(to.sin_port), | |
242 | ss->sock_fd, len, sent); | |
243 | } | |
244 | } | |
12e41d03 DL |
245 | } |
246 | ||
247 | static int ssmpingd_read_msg(struct ssmpingd_sock *ss) | |
248 | { | |
d62a17ae | 249 | struct interface *ifp; |
250 | struct sockaddr_in from; | |
251 | struct sockaddr_in to; | |
252 | socklen_t fromlen = sizeof(from); | |
253 | socklen_t tolen = sizeof(to); | |
254 | ifindex_t ifindex = -1; | |
255 | uint8_t buf[1000]; | |
256 | int len; | |
257 | ||
258 | ++ss->requests; | |
259 | ||
260 | len = pim_socket_recvfromto(ss->sock_fd, buf, sizeof(buf), &from, | |
261 | &fromlen, &to, &tolen, &ifindex); | |
262 | if (len < 0) { | |
263 | char source_str[INET_ADDRSTRLEN]; | |
264 | pim_inet4_dump("<src?>", ss->source_addr, source_str, | |
265 | sizeof(source_str)); | |
266 | zlog_warn( | |
267 | "%s: failure receiving ssmping for source %s on fd=%d: errno=%d: %s", | |
268 | __PRETTY_FUNCTION__, source_str, ss->sock_fd, errno, | |
269 | safe_strerror(errno)); | |
270 | return -1; | |
271 | } | |
272 | ||
71ad9915 | 273 | ifp = if_lookup_by_index(ifindex, ss->pim->vrf_id); |
d62a17ae | 274 | |
275 | if (buf[0] != PIM_SSMPINGD_REQUEST) { | |
276 | char source_str[INET_ADDRSTRLEN]; | |
277 | char from_str[INET_ADDRSTRLEN]; | |
278 | char to_str[INET_ADDRSTRLEN]; | |
279 | pim_inet4_dump("<src?>", ss->source_addr, source_str, | |
280 | sizeof(source_str)); | |
281 | pim_inet4_dump("<from?>", from.sin_addr, from_str, | |
282 | sizeof(from_str)); | |
283 | pim_inet4_dump("<to?>", to.sin_addr, to_str, sizeof(to_str)); | |
284 | zlog_warn( | |
285 | "%s: bad ssmping type=%d from %s,%d to %s,%d on interface %s ifindex=%d fd=%d src=%s", | |
286 | __PRETTY_FUNCTION__, buf[0], from_str, | |
287 | ntohs(from.sin_port), to_str, ntohs(to.sin_port), | |
288 | ifp ? ifp->name : "<iface?>", ifindex, ss->sock_fd, | |
289 | source_str); | |
290 | return 0; | |
291 | } | |
292 | ||
293 | if (PIM_DEBUG_SSMPINGD) { | |
294 | char source_str[INET_ADDRSTRLEN]; | |
295 | char from_str[INET_ADDRSTRLEN]; | |
296 | char to_str[INET_ADDRSTRLEN]; | |
297 | pim_inet4_dump("<src?>", ss->source_addr, source_str, | |
298 | sizeof(source_str)); | |
299 | pim_inet4_dump("<from?>", from.sin_addr, from_str, | |
300 | sizeof(from_str)); | |
301 | pim_inet4_dump("<to?>", to.sin_addr, to_str, sizeof(to_str)); | |
302 | zlog_debug( | |
303 | "%s: recv ssmping from %s,%d to %s,%d on interface %s ifindex=%d fd=%d src=%s", | |
304 | __PRETTY_FUNCTION__, from_str, ntohs(from.sin_port), | |
305 | to_str, ntohs(to.sin_port), | |
306 | ifp ? ifp->name : "<iface?>", ifindex, ss->sock_fd, | |
307 | source_str); | |
308 | } | |
309 | ||
310 | buf[0] = PIM_SSMPINGD_REPLY; | |
311 | ||
312 | /* unicast reply */ | |
313 | ssmpingd_sendto(ss, buf, len, from); | |
314 | ||
315 | /* multicast reply */ | |
71ad9915 | 316 | from.sin_addr = ss->pim->ssmpingd_group_addr; |
d62a17ae | 317 | ssmpingd_sendto(ss, buf, len, from); |
318 | ||
319 | return 0; | |
12e41d03 DL |
320 | } |
321 | ||
322 | static int ssmpingd_sock_read(struct thread *t) | |
323 | { | |
d62a17ae | 324 | struct ssmpingd_sock *ss; |
325 | int result; | |
12e41d03 | 326 | |
d62a17ae | 327 | ss = THREAD_ARG(t); |
12e41d03 | 328 | |
d62a17ae | 329 | result = ssmpingd_read_msg(ss); |
12e41d03 | 330 | |
d62a17ae | 331 | /* Keep reading */ |
332 | ssmpingd_read_on(ss); | |
12e41d03 | 333 | |
d62a17ae | 334 | return result; |
12e41d03 DL |
335 | } |
336 | ||
337 | static void ssmpingd_read_on(struct ssmpingd_sock *ss) | |
338 | { | |
d62a17ae | 339 | thread_add_read(master, ssmpingd_sock_read, ss, ss->sock_fd, |
340 | &ss->t_sock_read); | |
12e41d03 DL |
341 | } |
342 | ||
71ad9915 DS |
343 | static struct ssmpingd_sock *ssmpingd_new(struct pim_instance *pim, |
344 | struct in_addr source_addr) | |
12e41d03 | 345 | { |
d62a17ae | 346 | struct ssmpingd_sock *ss; |
347 | int sock_fd; | |
348 | ||
71ad9915 DS |
349 | if (!pim->ssmpingd_list) { |
350 | pim->ssmpingd_list = list_new(); | |
351 | if (!pim->ssmpingd_list) { | |
d62a17ae | 352 | zlog_err( |
353 | "%s %s: failure: qpim_ssmpingd_list=list_new()", | |
354 | __FILE__, __PRETTY_FUNCTION__); | |
355 | return 0; | |
356 | } | |
71ad9915 | 357 | pim->ssmpingd_list->del = (void (*)(void *))ssmpingd_free; |
d62a17ae | 358 | } |
359 | ||
360 | sock_fd = | |
361 | ssmpingd_socket(source_addr, /* port: */ 4321, /* mTTL: */ 64); | |
362 | if (sock_fd < 0) { | |
363 | char source_str[INET_ADDRSTRLEN]; | |
364 | pim_inet4_dump("<src?>", source_addr, source_str, | |
365 | sizeof(source_str)); | |
366 | zlog_warn("%s: ssmpingd_socket() failure for source %s", | |
367 | __PRETTY_FUNCTION__, source_str); | |
368 | return 0; | |
369 | } | |
370 | ||
371 | ss = XCALLOC(MTYPE_PIM_SSMPINGD, sizeof(*ss)); | |
372 | if (!ss) { | |
373 | char source_str[INET_ADDRSTRLEN]; | |
374 | pim_inet4_dump("<src?>", source_addr, source_str, | |
375 | sizeof(source_str)); | |
376 | zlog_err("%s: XCALLOC(%zu) failure for ssmpingd source %s", | |
377 | __PRETTY_FUNCTION__, sizeof(*ss), source_str); | |
378 | close(sock_fd); | |
379 | return 0; | |
380 | } | |
381 | ||
71ad9915 | 382 | ss->pim = pim; |
d62a17ae | 383 | ss->sock_fd = sock_fd; |
384 | ss->t_sock_read = NULL; | |
385 | ss->source_addr = source_addr; | |
386 | ss->creation = pim_time_monotonic_sec(); | |
387 | ss->requests = 0; | |
388 | ||
71ad9915 | 389 | listnode_add(pim->ssmpingd_list, ss); |
d62a17ae | 390 | |
391 | ssmpingd_read_on(ss); | |
392 | ||
393 | return ss; | |
12e41d03 DL |
394 | } |
395 | ||
71ad9915 | 396 | int pim_ssmpingd_start(struct pim_instance *pim, struct in_addr source_addr) |
12e41d03 | 397 | { |
d62a17ae | 398 | struct ssmpingd_sock *ss; |
399 | ||
71ad9915 | 400 | ss = ssmpingd_find(pim, source_addr); |
d62a17ae | 401 | if (ss) { |
402 | /* silently ignore request to recreate entry */ | |
403 | return 0; | |
404 | } | |
405 | ||
406 | { | |
407 | char source_str[INET_ADDRSTRLEN]; | |
408 | pim_inet4_dump("<src?>", source_addr, source_str, | |
409 | sizeof(source_str)); | |
410 | zlog_info("%s: starting ssmpingd for source %s", | |
411 | __PRETTY_FUNCTION__, source_str); | |
412 | } | |
413 | ||
71ad9915 | 414 | ss = ssmpingd_new(pim, source_addr); |
d62a17ae | 415 | if (!ss) { |
416 | char source_str[INET_ADDRSTRLEN]; | |
417 | pim_inet4_dump("<src?>", source_addr, source_str, | |
418 | sizeof(source_str)); | |
419 | zlog_warn("%s: ssmpingd_new() failure for source %s", | |
420 | __PRETTY_FUNCTION__, source_str); | |
421 | return -1; | |
422 | } | |
423 | ||
424 | return 0; | |
12e41d03 DL |
425 | } |
426 | ||
71ad9915 | 427 | int pim_ssmpingd_stop(struct pim_instance *pim, struct in_addr source_addr) |
12e41d03 | 428 | { |
d62a17ae | 429 | struct ssmpingd_sock *ss; |
430 | ||
71ad9915 | 431 | ss = ssmpingd_find(pim, source_addr); |
d62a17ae | 432 | if (!ss) { |
433 | char source_str[INET_ADDRSTRLEN]; | |
434 | pim_inet4_dump("<src?>", source_addr, source_str, | |
435 | sizeof(source_str)); | |
436 | zlog_warn("%s: could not find ssmpingd for source %s", | |
437 | __PRETTY_FUNCTION__, source_str); | |
438 | return -1; | |
439 | } | |
440 | ||
441 | { | |
442 | char source_str[INET_ADDRSTRLEN]; | |
443 | pim_inet4_dump("<src?>", source_addr, source_str, | |
444 | sizeof(source_str)); | |
445 | zlog_info("%s: stopping ssmpingd for source %s", | |
446 | __PRETTY_FUNCTION__, source_str); | |
447 | } | |
448 | ||
449 | ssmpingd_delete(ss); | |
450 | ||
451 | return 0; | |
12e41d03 | 452 | } |