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git.proxmox.com Git - mirror_frr.git/blob - pimd/pim_ssmpingd.c
3 * Copyright (C) 2008 Everton da Silva Marques
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.
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.
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
29 #include "pim_ssmpingd.h"
33 static const char *const PIM_SSMPINGD_REPLY_GROUP
= "232.43.211.234";
35 enum { PIM_SSMPINGD_REQUEST
= 'Q', PIM_SSMPINGD_REPLY
= 'A' };
37 static void ssmpingd_read_on(struct ssmpingd_sock
*ss
);
39 void pim_ssmpingd_init(struct pim_instance
*pim
)
43 zassert(!pim
->ssmpingd_list
);
45 result
= inet_pton(AF_INET
, PIM_SSMPINGD_REPLY_GROUP
,
46 &pim
->ssmpingd_group_addr
);
51 void pim_ssmpingd_destroy(struct pim_instance
*pim
)
53 if (pim
->ssmpingd_list
)
54 list_delete_and_null(&pim
->ssmpingd_list
);
57 static struct ssmpingd_sock
*ssmpingd_find(struct pim_instance
*pim
,
58 struct in_addr source_addr
)
60 struct listnode
*node
;
61 struct ssmpingd_sock
*ss
;
63 if (!pim
->ssmpingd_list
)
66 for (ALL_LIST_ELEMENTS_RO(pim
->ssmpingd_list
, node
, ss
))
67 if (source_addr
.s_addr
== ss
->source_addr
.s_addr
)
73 static void ssmpingd_free(struct ssmpingd_sock
*ss
)
75 XFREE(MTYPE_PIM_SSMPINGD
, ss
);
78 static int ssmpingd_socket(struct in_addr addr
, int port
, int mttl
)
80 struct sockaddr_in sockaddr
;
83 fd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
85 zlog_err("%s: could not create socket: errno=%d: %s",
86 __PRETTY_FUNCTION__
, errno
, safe_strerror(errno
));
90 sockaddr
.sin_family
= AF_INET
;
91 sockaddr
.sin_addr
= addr
;
92 sockaddr
.sin_port
= htons(port
);
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
));
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
));
105 /* Needed to obtain destination address from recvmsg() */
107 #if defined(HAVE_IP_PKTINFO)
108 /* Linux and Solaris IP_PKTINFO */
110 if (setsockopt(fd
, IPPROTO_IP
, IP_PKTINFO
, &opt
, sizeof(opt
))) {
112 "%s: could not set IP_PKTINFO on socket fd=%d: errno=%d: %s",
113 __PRETTY_FUNCTION__
, fd
, errno
,
114 safe_strerror(errno
));
116 #elif defined(HAVE_IP_RECVDSTADDR)
117 /* BSD IP_RECVDSTADDR */
119 if (setsockopt(fd
, IPPROTO_IP
, IP_RECVDSTADDR
, &opt
,
122 "%s: could not set IP_RECVDSTADDR on socket fd=%d: errno=%d: %s",
123 __PRETTY_FUNCTION__
, fd
, errno
,
124 safe_strerror(errno
));
128 "%s %s: missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()",
129 __FILE__
, __PRETTY_FUNCTION__
);
137 if (setsockopt(fd
, SOL_SOCKET
, SO_REUSEADDR
, (void *)&reuse
,
140 "%s: could not set Reuse Address Option on socket fd=%d: errno=%d: %s",
141 __PRETTY_FUNCTION__
, fd
, errno
,
142 safe_strerror(errno
));
148 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, (void *)&mttl
,
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
));
158 if (setsockopt_ipv4_multicast_loop(fd
, 0)) {
160 "%s: could not disable Multicast Loopback Option on socket fd=%d: errno=%d: %s",
161 __PRETTY_FUNCTION__
, fd
, errno
, safe_strerror(errno
));
163 return PIM_SOCK_ERR_LOOP
;
166 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_IF
, (void *)&addr
,
169 "%s: could not set Outgoing Interface Option on socket fd=%d: errno=%d: %s",
170 __PRETTY_FUNCTION__
, fd
, errno
, safe_strerror(errno
));
178 flags
= fcntl(fd
, F_GETFL
, 0);
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
));
188 if (fcntl(fd
, F_SETFL
, flags
| O_NONBLOCK
)) {
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
));
201 static void ssmpingd_delete(struct ssmpingd_sock
*ss
)
205 THREAD_OFF(ss
->t_sock_read
);
207 if (close(ss
->sock_fd
)) {
208 char source_str
[INET_ADDRSTRLEN
];
209 pim_inet4_dump("<src?>", ss
->source_addr
, source_str
,
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
));
218 listnode_delete(ss
->pim
->ssmpingd_list
, ss
);
222 static void ssmpingd_sendto(struct ssmpingd_sock
*ss
, const uint8_t *buf
,
223 int len
, struct sockaddr_in to
)
225 socklen_t tolen
= sizeof(to
);
228 sent
= sendto(ss
->sock_fd
, buf
, len
, MSG_DONTWAIT
,
229 (struct sockaddr
*)&to
, tolen
);
231 char to_str
[INET_ADDRSTRLEN
];
232 pim_inet4_dump("<to?>", to
.sin_addr
, to_str
, sizeof(to_str
));
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
));
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
);
247 static int ssmpingd_read_msg(struct ssmpingd_sock
*ss
)
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;
260 len
= pim_socket_recvfromto(ss
->sock_fd
, buf
, sizeof(buf
), &from
,
261 &fromlen
, &to
, &tolen
, &ifindex
);
263 char source_str
[INET_ADDRSTRLEN
];
264 pim_inet4_dump("<src?>", ss
->source_addr
, source_str
,
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
));
273 ifp
= if_lookup_by_index(ifindex
, ss
->pim
->vrf_id
);
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
,
281 pim_inet4_dump("<from?>", from
.sin_addr
, from_str
,
283 pim_inet4_dump("<to?>", to
.sin_addr
, to_str
, sizeof(to_str
));
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
,
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
,
299 pim_inet4_dump("<from?>", from
.sin_addr
, from_str
,
301 pim_inet4_dump("<to?>", to
.sin_addr
, to_str
, sizeof(to_str
));
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
,
310 buf
[0] = PIM_SSMPINGD_REPLY
;
313 ssmpingd_sendto(ss
, buf
, len
, from
);
315 /* multicast reply */
316 from
.sin_addr
= ss
->pim
->ssmpingd_group_addr
;
317 ssmpingd_sendto(ss
, buf
, len
, from
);
322 static int ssmpingd_sock_read(struct thread
*t
)
324 struct ssmpingd_sock
*ss
;
329 result
= ssmpingd_read_msg(ss
);
332 ssmpingd_read_on(ss
);
337 static void ssmpingd_read_on(struct ssmpingd_sock
*ss
)
339 thread_add_read(master
, ssmpingd_sock_read
, ss
, ss
->sock_fd
,
343 static struct ssmpingd_sock
*ssmpingd_new(struct pim_instance
*pim
,
344 struct in_addr source_addr
)
346 struct ssmpingd_sock
*ss
;
349 if (!pim
->ssmpingd_list
) {
350 pim
->ssmpingd_list
= list_new();
351 if (!pim
->ssmpingd_list
) {
353 "%s %s: failure: qpim_ssmpingd_list=list_new()",
354 __FILE__
, __PRETTY_FUNCTION__
);
357 pim
->ssmpingd_list
->del
= (void (*)(void *))ssmpingd_free
;
361 ssmpingd_socket(source_addr
, /* port: */ 4321, /* mTTL: */ 64);
363 char source_str
[INET_ADDRSTRLEN
];
364 pim_inet4_dump("<src?>", source_addr
, source_str
,
366 zlog_warn("%s: ssmpingd_socket() failure for source %s",
367 __PRETTY_FUNCTION__
, source_str
);
371 ss
= XCALLOC(MTYPE_PIM_SSMPINGD
, sizeof(*ss
));
373 char source_str
[INET_ADDRSTRLEN
];
374 pim_inet4_dump("<src?>", source_addr
, source_str
,
376 zlog_err("%s: XCALLOC(%zu) failure for ssmpingd source %s",
377 __PRETTY_FUNCTION__
, sizeof(*ss
), source_str
);
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();
389 listnode_add(pim
->ssmpingd_list
, ss
);
391 ssmpingd_read_on(ss
);
396 int pim_ssmpingd_start(struct pim_instance
*pim
, struct in_addr source_addr
)
398 struct ssmpingd_sock
*ss
;
400 ss
= ssmpingd_find(pim
, source_addr
);
402 /* silently ignore request to recreate entry */
407 char source_str
[INET_ADDRSTRLEN
];
408 pim_inet4_dump("<src?>", source_addr
, source_str
,
410 zlog_info("%s: starting ssmpingd for source %s",
411 __PRETTY_FUNCTION__
, source_str
);
414 ss
= ssmpingd_new(pim
, source_addr
);
416 char source_str
[INET_ADDRSTRLEN
];
417 pim_inet4_dump("<src?>", source_addr
, source_str
,
419 zlog_warn("%s: ssmpingd_new() failure for source %s",
420 __PRETTY_FUNCTION__
, source_str
);
427 int pim_ssmpingd_stop(struct pim_instance
*pim
, struct in_addr source_addr
)
429 struct ssmpingd_sock
*ss
;
431 ss
= ssmpingd_find(pim
, source_addr
);
433 char source_str
[INET_ADDRSTRLEN
];
434 pim_inet4_dump("<src?>", source_addr
, source_str
,
436 zlog_warn("%s: could not find ssmpingd for source %s",
437 __PRETTY_FUNCTION__
, source_str
);
442 char source_str
[INET_ADDRSTRLEN
];
443 pim_inet4_dump("<src?>", source_addr
, source_str
,
445 zlog_info("%s: stopping ssmpingd for source %s",
446 __PRETTY_FUNCTION__
, source_str
);