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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" |
3613d898 | 27 | #include "lib_errors.h" |
12e41d03 | 28 | |
8bfb8b67 | 29 | #include "pimd.h" |
12e41d03 DL |
30 | #include "pim_ssmpingd.h" |
31 | #include "pim_time.h" | |
32 | #include "pim_sock.h" | |
12e41d03 | 33 | |
d62a17ae | 34 | static const char *const PIM_SSMPINGD_REPLY_GROUP = "232.43.211.234"; |
12e41d03 | 35 | |
d62a17ae | 36 | enum { PIM_SSMPINGD_REQUEST = 'Q', PIM_SSMPINGD_REPLY = 'A' }; |
12e41d03 DL |
37 | |
38 | static void ssmpingd_read_on(struct ssmpingd_sock *ss); | |
39 | ||
71ad9915 | 40 | void pim_ssmpingd_init(struct pim_instance *pim) |
12e41d03 | 41 | { |
d62a17ae | 42 | int result; |
12e41d03 | 43 | |
71ad9915 | 44 | zassert(!pim->ssmpingd_list); |
12e41d03 | 45 | |
d62a17ae | 46 | result = inet_pton(AF_INET, PIM_SSMPINGD_REPLY_GROUP, |
71ad9915 | 47 | &pim->ssmpingd_group_addr); |
d62a17ae | 48 | |
49 | zassert(result > 0); | |
12e41d03 DL |
50 | } |
51 | ||
71ad9915 | 52 | void pim_ssmpingd_destroy(struct pim_instance *pim) |
12e41d03 | 53 | { |
affe9e99 | 54 | if (pim->ssmpingd_list) |
6a154c88 | 55 | list_delete(&pim->ssmpingd_list); |
12e41d03 DL |
56 | } |
57 | ||
71ad9915 DS |
58 | static struct ssmpingd_sock *ssmpingd_find(struct pim_instance *pim, |
59 | struct in_addr source_addr) | |
12e41d03 | 60 | { |
d62a17ae | 61 | struct listnode *node; |
62 | struct ssmpingd_sock *ss; | |
12e41d03 | 63 | |
71ad9915 | 64 | if (!pim->ssmpingd_list) |
d62a17ae | 65 | return 0; |
12e41d03 | 66 | |
71ad9915 | 67 | for (ALL_LIST_ELEMENTS_RO(pim->ssmpingd_list, node, ss)) |
d62a17ae | 68 | if (source_addr.s_addr == ss->source_addr.s_addr) |
69 | return ss; | |
12e41d03 | 70 | |
d62a17ae | 71 | return 0; |
12e41d03 DL |
72 | } |
73 | ||
74 | static void ssmpingd_free(struct ssmpingd_sock *ss) | |
75 | { | |
d62a17ae | 76 | XFREE(MTYPE_PIM_SSMPINGD, ss); |
12e41d03 DL |
77 | } |
78 | ||
79 | static int ssmpingd_socket(struct in_addr addr, int port, int mttl) | |
80 | { | |
d62a17ae | 81 | struct sockaddr_in sockaddr; |
82 | int fd; | |
83 | ||
84 | fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); | |
85 | if (fd < 0) { | |
450971aa | 86 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
87 | "%s: could not create socket: errno=%d: %s", |
88 | __PRETTY_FUNCTION__, errno, safe_strerror(errno)); | |
d62a17ae | 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 |
af4c2728 | 129 | flog_err( |
450971aa | 130 | EC_LIB_DEVELOPMENT, |
d62a17ae | 131 | "%s %s: missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()", |
132 | __FILE__, __PRETTY_FUNCTION__); | |
133 | close(fd); | |
134 | return -1; | |
12e41d03 | 135 | #endif |
d62a17ae | 136 | } |
137 | ||
138 | { | |
139 | int reuse = 1; | |
140 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&reuse, | |
141 | sizeof(reuse))) { | |
142 | zlog_warn( | |
143 | "%s: could not set Reuse Address Option on socket fd=%d: errno=%d: %s", | |
144 | __PRETTY_FUNCTION__, fd, errno, | |
145 | safe_strerror(errno)); | |
146 | close(fd); | |
147 | return -1; | |
148 | } | |
149 | } | |
150 | ||
151 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&mttl, | |
152 | sizeof(mttl))) { | |
153 | zlog_warn( | |
154 | "%s: could not set multicast TTL=%d on socket fd=%d: errno=%d: %s", | |
155 | __PRETTY_FUNCTION__, mttl, fd, errno, | |
156 | safe_strerror(errno)); | |
157 | close(fd); | |
158 | return -1; | |
159 | } | |
160 | ||
161 | if (setsockopt_ipv4_multicast_loop(fd, 0)) { | |
162 | zlog_warn( | |
163 | "%s: could not disable Multicast Loopback Option on socket fd=%d: errno=%d: %s", | |
164 | __PRETTY_FUNCTION__, fd, errno, safe_strerror(errno)); | |
165 | close(fd); | |
166 | return PIM_SOCK_ERR_LOOP; | |
167 | } | |
168 | ||
169 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, (void *)&addr, | |
170 | sizeof(addr))) { | |
171 | zlog_warn( | |
172 | "%s: could not set Outgoing Interface Option on socket fd=%d: errno=%d: %s", | |
173 | __PRETTY_FUNCTION__, fd, errno, safe_strerror(errno)); | |
174 | close(fd); | |
175 | return -1; | |
176 | } | |
177 | ||
178 | { | |
179 | long flags; | |
180 | ||
181 | flags = fcntl(fd, F_GETFL, 0); | |
182 | if (flags < 0) { | |
183 | zlog_warn( | |
184 | "%s: could not get fcntl(F_GETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s", | |
185 | __PRETTY_FUNCTION__, fd, errno, | |
186 | safe_strerror(errno)); | |
187 | close(fd); | |
188 | return -1; | |
189 | } | |
190 | ||
191 | if (fcntl(fd, F_SETFL, flags | O_NONBLOCK)) { | |
192 | zlog_warn( | |
193 | "%s: could not set fcntl(F_SETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s", | |
194 | __PRETTY_FUNCTION__, fd, errno, | |
195 | safe_strerror(errno)); | |
196 | close(fd); | |
197 | return -1; | |
198 | } | |
199 | } | |
200 | ||
201 | return fd; | |
12e41d03 DL |
202 | } |
203 | ||
204 | static void ssmpingd_delete(struct ssmpingd_sock *ss) | |
205 | { | |
d62a17ae | 206 | zassert(ss); |
d62a17ae | 207 | |
208 | THREAD_OFF(ss->t_sock_read); | |
209 | ||
210 | if (close(ss->sock_fd)) { | |
211 | char source_str[INET_ADDRSTRLEN]; | |
212 | pim_inet4_dump("<src?>", ss->source_addr, source_str, | |
213 | sizeof(source_str)); | |
214 | zlog_warn( | |
215 | "%s: failure closing ssmpingd sock_fd=%d for source %s: errno=%d: %s", | |
216 | __PRETTY_FUNCTION__, ss->sock_fd, source_str, errno, | |
217 | safe_strerror(errno)); | |
218 | /* warning only */ | |
219 | } | |
220 | ||
71ad9915 | 221 | listnode_delete(ss->pim->ssmpingd_list, ss); |
d62a17ae | 222 | ssmpingd_free(ss); |
12e41d03 DL |
223 | } |
224 | ||
d62a17ae | 225 | static void ssmpingd_sendto(struct ssmpingd_sock *ss, const uint8_t *buf, |
226 | int len, struct sockaddr_in to) | |
12e41d03 | 227 | { |
d62a17ae | 228 | socklen_t tolen = sizeof(to); |
229 | int sent; | |
230 | ||
231 | sent = sendto(ss->sock_fd, buf, len, MSG_DONTWAIT, | |
232 | (struct sockaddr *)&to, tolen); | |
233 | if (sent != len) { | |
234 | char to_str[INET_ADDRSTRLEN]; | |
235 | pim_inet4_dump("<to?>", to.sin_addr, to_str, sizeof(to_str)); | |
236 | if (sent < 0) { | |
237 | zlog_warn( | |
238 | "%s: sendto() failure to %s,%d: fd=%d len=%d: errno=%d: %s", | |
239 | __PRETTY_FUNCTION__, to_str, ntohs(to.sin_port), | |
240 | ss->sock_fd, len, errno, safe_strerror(errno)); | |
241 | } else { | |
242 | zlog_warn( | |
243 | "%s: sendto() partial to %s,%d: fd=%d len=%d: sent=%d", | |
244 | __PRETTY_FUNCTION__, to_str, ntohs(to.sin_port), | |
245 | ss->sock_fd, len, sent); | |
246 | } | |
247 | } | |
12e41d03 DL |
248 | } |
249 | ||
250 | static int ssmpingd_read_msg(struct ssmpingd_sock *ss) | |
251 | { | |
d62a17ae | 252 | struct interface *ifp; |
253 | struct sockaddr_in from; | |
254 | struct sockaddr_in to; | |
255 | socklen_t fromlen = sizeof(from); | |
256 | socklen_t tolen = sizeof(to); | |
257 | ifindex_t ifindex = -1; | |
258 | uint8_t buf[1000]; | |
259 | int len; | |
260 | ||
261 | ++ss->requests; | |
262 | ||
263 | len = pim_socket_recvfromto(ss->sock_fd, buf, sizeof(buf), &from, | |
264 | &fromlen, &to, &tolen, &ifindex); | |
265 | if (len < 0) { | |
266 | char source_str[INET_ADDRSTRLEN]; | |
267 | pim_inet4_dump("<src?>", ss->source_addr, source_str, | |
268 | sizeof(source_str)); | |
269 | zlog_warn( | |
270 | "%s: failure receiving ssmping for source %s on fd=%d: errno=%d: %s", | |
271 | __PRETTY_FUNCTION__, source_str, ss->sock_fd, errno, | |
272 | safe_strerror(errno)); | |
273 | return -1; | |
274 | } | |
275 | ||
71ad9915 | 276 | ifp = if_lookup_by_index(ifindex, ss->pim->vrf_id); |
d62a17ae | 277 | |
278 | if (buf[0] != PIM_SSMPINGD_REQUEST) { | |
279 | char source_str[INET_ADDRSTRLEN]; | |
280 | char from_str[INET_ADDRSTRLEN]; | |
281 | char to_str[INET_ADDRSTRLEN]; | |
282 | pim_inet4_dump("<src?>", ss->source_addr, source_str, | |
283 | sizeof(source_str)); | |
284 | pim_inet4_dump("<from?>", from.sin_addr, from_str, | |
285 | sizeof(from_str)); | |
286 | pim_inet4_dump("<to?>", to.sin_addr, to_str, sizeof(to_str)); | |
287 | zlog_warn( | |
288 | "%s: bad ssmping type=%d from %s,%d to %s,%d on interface %s ifindex=%d fd=%d src=%s", | |
289 | __PRETTY_FUNCTION__, buf[0], from_str, | |
290 | ntohs(from.sin_port), to_str, ntohs(to.sin_port), | |
291 | ifp ? ifp->name : "<iface?>", ifindex, ss->sock_fd, | |
292 | source_str); | |
293 | return 0; | |
294 | } | |
295 | ||
296 | if (PIM_DEBUG_SSMPINGD) { | |
297 | char source_str[INET_ADDRSTRLEN]; | |
298 | char from_str[INET_ADDRSTRLEN]; | |
299 | char to_str[INET_ADDRSTRLEN]; | |
300 | pim_inet4_dump("<src?>", ss->source_addr, source_str, | |
301 | sizeof(source_str)); | |
302 | pim_inet4_dump("<from?>", from.sin_addr, from_str, | |
303 | sizeof(from_str)); | |
304 | pim_inet4_dump("<to?>", to.sin_addr, to_str, sizeof(to_str)); | |
305 | zlog_debug( | |
306 | "%s: recv ssmping from %s,%d to %s,%d on interface %s ifindex=%d fd=%d src=%s", | |
307 | __PRETTY_FUNCTION__, from_str, ntohs(from.sin_port), | |
308 | to_str, ntohs(to.sin_port), | |
309 | ifp ? ifp->name : "<iface?>", ifindex, ss->sock_fd, | |
310 | source_str); | |
311 | } | |
312 | ||
313 | buf[0] = PIM_SSMPINGD_REPLY; | |
314 | ||
315 | /* unicast reply */ | |
316 | ssmpingd_sendto(ss, buf, len, from); | |
317 | ||
318 | /* multicast reply */ | |
71ad9915 | 319 | from.sin_addr = ss->pim->ssmpingd_group_addr; |
d62a17ae | 320 | ssmpingd_sendto(ss, buf, len, from); |
321 | ||
322 | return 0; | |
12e41d03 DL |
323 | } |
324 | ||
325 | static int ssmpingd_sock_read(struct thread *t) | |
326 | { | |
d62a17ae | 327 | struct ssmpingd_sock *ss; |
328 | int result; | |
12e41d03 | 329 | |
d62a17ae | 330 | ss = THREAD_ARG(t); |
12e41d03 | 331 | |
d62a17ae | 332 | result = ssmpingd_read_msg(ss); |
12e41d03 | 333 | |
d62a17ae | 334 | /* Keep reading */ |
335 | ssmpingd_read_on(ss); | |
12e41d03 | 336 | |
d62a17ae | 337 | return result; |
12e41d03 DL |
338 | } |
339 | ||
340 | static void ssmpingd_read_on(struct ssmpingd_sock *ss) | |
341 | { | |
36417fcc | 342 | thread_add_read(router->master, ssmpingd_sock_read, ss, ss->sock_fd, |
d62a17ae | 343 | &ss->t_sock_read); |
12e41d03 DL |
344 | } |
345 | ||
71ad9915 DS |
346 | static struct ssmpingd_sock *ssmpingd_new(struct pim_instance *pim, |
347 | struct in_addr source_addr) | |
12e41d03 | 348 | { |
d62a17ae | 349 | struct ssmpingd_sock *ss; |
350 | int sock_fd; | |
351 | ||
71ad9915 DS |
352 | if (!pim->ssmpingd_list) { |
353 | pim->ssmpingd_list = list_new(); | |
71ad9915 | 354 | pim->ssmpingd_list->del = (void (*)(void *))ssmpingd_free; |
d62a17ae | 355 | } |
356 | ||
357 | sock_fd = | |
358 | ssmpingd_socket(source_addr, /* port: */ 4321, /* mTTL: */ 64); | |
359 | if (sock_fd < 0) { | |
360 | char source_str[INET_ADDRSTRLEN]; | |
361 | pim_inet4_dump("<src?>", source_addr, source_str, | |
362 | sizeof(source_str)); | |
363 | zlog_warn("%s: ssmpingd_socket() failure for source %s", | |
364 | __PRETTY_FUNCTION__, source_str); | |
365 | return 0; | |
366 | } | |
367 | ||
368 | ss = XCALLOC(MTYPE_PIM_SSMPINGD, sizeof(*ss)); | |
d62a17ae | 369 | |
71ad9915 | 370 | ss->pim = pim; |
d62a17ae | 371 | ss->sock_fd = sock_fd; |
372 | ss->t_sock_read = NULL; | |
373 | ss->source_addr = source_addr; | |
374 | ss->creation = pim_time_monotonic_sec(); | |
375 | ss->requests = 0; | |
376 | ||
71ad9915 | 377 | listnode_add(pim->ssmpingd_list, ss); |
d62a17ae | 378 | |
379 | ssmpingd_read_on(ss); | |
380 | ||
381 | return ss; | |
12e41d03 DL |
382 | } |
383 | ||
71ad9915 | 384 | int pim_ssmpingd_start(struct pim_instance *pim, struct in_addr source_addr) |
12e41d03 | 385 | { |
d62a17ae | 386 | struct ssmpingd_sock *ss; |
387 | ||
71ad9915 | 388 | ss = ssmpingd_find(pim, source_addr); |
d62a17ae | 389 | if (ss) { |
390 | /* silently ignore request to recreate entry */ | |
391 | return 0; | |
392 | } | |
393 | ||
394 | { | |
395 | char source_str[INET_ADDRSTRLEN]; | |
396 | pim_inet4_dump("<src?>", source_addr, source_str, | |
397 | sizeof(source_str)); | |
398 | zlog_info("%s: starting ssmpingd for source %s", | |
399 | __PRETTY_FUNCTION__, source_str); | |
400 | } | |
401 | ||
71ad9915 | 402 | ss = ssmpingd_new(pim, source_addr); |
d62a17ae | 403 | if (!ss) { |
404 | char source_str[INET_ADDRSTRLEN]; | |
405 | pim_inet4_dump("<src?>", source_addr, source_str, | |
406 | sizeof(source_str)); | |
407 | zlog_warn("%s: ssmpingd_new() failure for source %s", | |
408 | __PRETTY_FUNCTION__, source_str); | |
409 | return -1; | |
410 | } | |
411 | ||
412 | return 0; | |
12e41d03 DL |
413 | } |
414 | ||
71ad9915 | 415 | int pim_ssmpingd_stop(struct pim_instance *pim, struct in_addr source_addr) |
12e41d03 | 416 | { |
d62a17ae | 417 | struct ssmpingd_sock *ss; |
418 | ||
71ad9915 | 419 | ss = ssmpingd_find(pim, source_addr); |
d62a17ae | 420 | if (!ss) { |
421 | char source_str[INET_ADDRSTRLEN]; | |
422 | pim_inet4_dump("<src?>", source_addr, source_str, | |
423 | sizeof(source_str)); | |
424 | zlog_warn("%s: could not find ssmpingd for source %s", | |
425 | __PRETTY_FUNCTION__, source_str); | |
426 | return -1; | |
427 | } | |
428 | ||
429 | { | |
430 | char source_str[INET_ADDRSTRLEN]; | |
431 | pim_inet4_dump("<src?>", source_addr, source_str, | |
432 | sizeof(source_str)); | |
433 | zlog_info("%s: stopping ssmpingd for source %s", | |
434 | __PRETTY_FUNCTION__, source_str); | |
435 | } | |
436 | ||
437 | ssmpingd_delete(ss); | |
438 | ||
439 | return 0; | |
12e41d03 | 440 | } |