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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
27 #include "lib_errors.h"
30 #include "pim_ssmpingd.h"
34 static const char *const PIM_SSMPINGD_REPLY_GROUP
= "232.43.211.234";
36 enum { PIM_SSMPINGD_REQUEST
= 'Q', PIM_SSMPINGD_REPLY
= 'A' };
38 static void ssmpingd_read_on(struct ssmpingd_sock
*ss
);
40 void pim_ssmpingd_init(struct pim_instance
*pim
)
44 assert(!pim
->ssmpingd_list
);
46 result
= inet_pton(AF_INET
, PIM_SSMPINGD_REPLY_GROUP
,
47 &pim
->ssmpingd_group_addr
);
52 void pim_ssmpingd_destroy(struct pim_instance
*pim
)
54 if (pim
->ssmpingd_list
)
55 list_delete(&pim
->ssmpingd_list
);
58 static struct ssmpingd_sock
*ssmpingd_find(struct pim_instance
*pim
,
59 struct in_addr source_addr
)
61 struct listnode
*node
;
62 struct ssmpingd_sock
*ss
;
64 if (!pim
->ssmpingd_list
)
67 for (ALL_LIST_ELEMENTS_RO(pim
->ssmpingd_list
, node
, ss
))
68 if (source_addr
.s_addr
== ss
->source_addr
.s_addr
)
74 static void ssmpingd_free(struct ssmpingd_sock
*ss
)
76 XFREE(MTYPE_PIM_SSMPINGD
, ss
);
79 static int ssmpingd_socket(struct in_addr addr
, int port
, int mttl
)
81 struct sockaddr_in sockaddr
;
84 fd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
86 flog_err_sys(EC_LIB_SOCKET
,
87 "%s: could not create socket: errno=%d: %s",
88 __func__
, errno
, safe_strerror(errno
));
92 sockaddr
.sin_family
= AF_INET
;
93 sockaddr
.sin_addr
= addr
;
94 sockaddr
.sin_port
= htons(port
);
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
));
100 "%s: bind(fd=%d,addr=%s,port=%d,len=%zu) failure: errno=%d: %s",
101 __func__
, fd
, addr_str
, port
, sizeof(sockaddr
), errno
,
102 safe_strerror(errno
));
107 /* Needed to obtain destination address from recvmsg() */
109 #if defined(HAVE_IP_PKTINFO)
110 /* Linux and Solaris IP_PKTINFO */
112 if (setsockopt(fd
, IPPROTO_IP
, IP_PKTINFO
, &opt
, sizeof(opt
))) {
114 "%s: could not set IP_PKTINFO on socket fd=%d: errno=%d: %s",
115 __func__
, fd
, errno
, safe_strerror(errno
));
117 #elif defined(HAVE_IP_RECVDSTADDR)
118 /* BSD IP_RECVDSTADDR */
120 if (setsockopt(fd
, IPPROTO_IP
, IP_RECVDSTADDR
, &opt
,
123 "%s: could not set IP_RECVDSTADDR on socket fd=%d: errno=%d: %s",
124 __func__
, fd
, errno
, safe_strerror(errno
));
129 "%s %s: missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()",
138 if (setsockopt(fd
, SOL_SOCKET
, SO_REUSEADDR
, (void *)&reuse
,
141 "%s: could not set Reuse Address Option on socket fd=%d: errno=%d: %s",
142 __func__
, fd
, errno
, 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 __func__
, mttl
, fd
, errno
, safe_strerror(errno
));
157 if (setsockopt_ipv4_multicast_loop(fd
, 0)) {
159 "%s: could not disable Multicast Loopback Option on socket fd=%d: errno=%d: %s",
160 __func__
, fd
, errno
, safe_strerror(errno
));
162 return PIM_SOCK_ERR_LOOP
;
165 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_IF
, (void *)&addr
,
168 "%s: could not set Outgoing Interface Option on socket fd=%d: errno=%d: %s",
169 __func__
, fd
, errno
, safe_strerror(errno
));
177 flags
= fcntl(fd
, F_GETFL
, 0);
180 "%s: could not get fcntl(F_GETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
181 __func__
, fd
, errno
, safe_strerror(errno
));
186 if (fcntl(fd
, F_SETFL
, flags
| O_NONBLOCK
)) {
188 "%s: could not set fcntl(F_SETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
189 __func__
, fd
, errno
, safe_strerror(errno
));
198 static void ssmpingd_delete(struct ssmpingd_sock
*ss
)
202 THREAD_OFF(ss
->t_sock_read
);
204 if (close(ss
->sock_fd
)) {
205 char source_str
[INET_ADDRSTRLEN
];
206 pim_inet4_dump("<src?>", ss
->source_addr
, source_str
,
209 "%s: failure closing ssmpingd sock_fd=%d for source %s: errno=%d: %s",
210 __func__
, ss
->sock_fd
, source_str
, errno
,
211 safe_strerror(errno
));
215 listnode_delete(ss
->pim
->ssmpingd_list
, ss
);
219 static void ssmpingd_sendto(struct ssmpingd_sock
*ss
, const uint8_t *buf
,
220 int len
, struct sockaddr_in to
)
222 socklen_t tolen
= sizeof(to
);
225 sent
= sendto(ss
->sock_fd
, buf
, len
, MSG_DONTWAIT
,
226 (struct sockaddr
*)&to
, tolen
);
228 char to_str
[INET_ADDRSTRLEN
];
229 pim_inet4_dump("<to?>", to
.sin_addr
, to_str
, sizeof(to_str
));
232 "%s: sendto() failure to %s,%d: fd=%d len=%d: errno=%d: %s",
233 __func__
, to_str
, ntohs(to
.sin_port
),
234 ss
->sock_fd
, len
, errno
, safe_strerror(errno
));
237 "%s: sendto() partial to %s,%d: fd=%d len=%d: sent=%d",
238 __func__
, to_str
, ntohs(to
.sin_port
),
239 ss
->sock_fd
, len
, sent
);
244 static int ssmpingd_read_msg(struct ssmpingd_sock
*ss
)
246 struct interface
*ifp
;
247 struct sockaddr_storage from
;
248 struct sockaddr_storage to
;
249 socklen_t fromlen
= sizeof(from
);
250 socklen_t tolen
= sizeof(to
);
251 ifindex_t ifindex
= -1;
257 len
= pim_socket_recvfromto(ss
->sock_fd
, buf
, sizeof(buf
), &from
,
258 &fromlen
, &to
, &tolen
, &ifindex
);
262 "%s: failure receiving ssmping for source %pI4 on fd=%d: errno=%d: %s",
263 __func__
, &ss
->source_addr
, ss
->sock_fd
, errno
,
264 safe_strerror(errno
));
268 ifp
= if_lookup_by_index(ifindex
, ss
->pim
->vrf
->vrf_id
);
270 if (buf
[0] != PIM_SSMPINGD_REQUEST
) {
272 "%s: bad ssmping type=%d from %pSUp to %pSUp on interface %s ifindex=%d fd=%d src=%pI4",
273 __func__
, buf
[0], &from
, &to
,
274 ifp
? ifp
->name
: "<iface?>", ifindex
, ss
->sock_fd
,
279 if (PIM_DEBUG_SSMPINGD
) {
281 "%s: recv ssmping from %pSUp, to %pSUp, on interface %s ifindex=%d fd=%d src=%pI4",
282 __func__
, &from
, &to
, ifp
? ifp
->name
: "<iface?>",
283 ifindex
, ss
->sock_fd
, &ss
->source_addr
);
286 buf
[0] = PIM_SSMPINGD_REPLY
;
288 struct sockaddr_in
*from_addr
= (struct sockaddr_in
*)&from
;
291 ssmpingd_sendto(ss
, buf
, len
, *from_addr
);
293 /* multicast reply */
294 from_addr
->sin_addr
= ss
->pim
->ssmpingd_group_addr
;
295 ssmpingd_sendto(ss
, buf
, len
, *from_addr
);
300 static void ssmpingd_sock_read(struct thread
*t
)
302 struct ssmpingd_sock
*ss
;
306 ssmpingd_read_msg(ss
);
309 ssmpingd_read_on(ss
);
312 static void ssmpingd_read_on(struct ssmpingd_sock
*ss
)
314 thread_add_read(router
->master
, ssmpingd_sock_read
, ss
, ss
->sock_fd
,
318 static struct ssmpingd_sock
*ssmpingd_new(struct pim_instance
*pim
,
319 struct in_addr source_addr
)
321 struct ssmpingd_sock
*ss
;
324 if (!pim
->ssmpingd_list
) {
325 pim
->ssmpingd_list
= list_new();
326 pim
->ssmpingd_list
->del
= (void (*)(void *))ssmpingd_free
;
330 ssmpingd_socket(source_addr
, /* port: */ 4321, /* mTTL: */ 64);
332 char source_str
[INET_ADDRSTRLEN
];
333 pim_inet4_dump("<src?>", source_addr
, source_str
,
335 zlog_warn("%s: ssmpingd_socket() failure for source %s",
336 __func__
, source_str
);
340 ss
= XCALLOC(MTYPE_PIM_SSMPINGD
, sizeof(*ss
));
343 ss
->sock_fd
= sock_fd
;
344 ss
->t_sock_read
= NULL
;
345 ss
->source_addr
= source_addr
;
346 ss
->creation
= pim_time_monotonic_sec();
349 listnode_add(pim
->ssmpingd_list
, ss
);
351 ssmpingd_read_on(ss
);
356 int pim_ssmpingd_start(struct pim_instance
*pim
, struct in_addr source_addr
)
358 struct ssmpingd_sock
*ss
;
360 ss
= ssmpingd_find(pim
, source_addr
);
362 /* silently ignore request to recreate entry */
367 char source_str
[INET_ADDRSTRLEN
];
368 pim_inet4_dump("<src?>", source_addr
, source_str
,
370 zlog_info("%s: starting ssmpingd for source %s", __func__
,
374 ss
= ssmpingd_new(pim
, source_addr
);
376 char source_str
[INET_ADDRSTRLEN
];
377 pim_inet4_dump("<src?>", source_addr
, source_str
,
379 zlog_warn("%s: ssmpingd_new() failure for source %s", __func__
,
387 int pim_ssmpingd_stop(struct pim_instance
*pim
, struct in_addr source_addr
)
389 struct ssmpingd_sock
*ss
;
391 ss
= ssmpingd_find(pim
, source_addr
);
393 char source_str
[INET_ADDRSTRLEN
];
394 pim_inet4_dump("<src?>", source_addr
, source_str
,
396 zlog_warn("%s: could not find ssmpingd for source %s", __func__
,
402 char source_str
[INET_ADDRSTRLEN
];
403 pim_inet4_dump("<src?>", source_addr
, source_str
,
405 zlog_info("%s: stopping ssmpingd for source %s", __func__
,