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
22 #include <sys/types.h>
23 #include <sys/socket.h>
24 #include <netinet/in.h>
25 #include <netinet/igmp.h>
26 #include <arpa/inet.h>
38 #include "pim_mroute.h"
41 #include "pim_igmp_join.h"
45 int pim_socket_raw(int protocol
)
49 if (pimd_privs
.change(ZPRIVS_RAISE
))
50 zlog_err("pim_sockek_raw: could not raise privs, %s",
51 safe_strerror(errno
));
53 fd
= socket(AF_INET
, SOCK_RAW
, protocol
);
55 if (pimd_privs
.change(ZPRIVS_LOWER
))
56 zlog_err("pim_socket_raw: could not lower privs, %s",
57 safe_strerror(errno
));
60 zlog_warn("Could not create raw socket: errno=%d: %s", errno
,
61 safe_strerror(errno
));
62 return PIM_SOCK_ERR_SOCKET
;
68 void pim_socket_ip_hdr(int fd
)
72 if (pimd_privs
.change(ZPRIVS_RAISE
))
73 zlog_err("%s: could not raise privs, %s", __PRETTY_FUNCTION__
,
74 safe_strerror(errno
));
76 if (setsockopt(fd
, IPPROTO_IP
, IP_HDRINCL
, &on
, sizeof(on
)))
77 zlog_err("%s: Could not turn on IP_HDRINCL option: %s",
78 __PRETTY_FUNCTION__
, safe_strerror(errno
));
80 if (pimd_privs
.change(ZPRIVS_LOWER
))
81 zlog_err("%s: could not lower privs, %s", __PRETTY_FUNCTION__
,
82 safe_strerror(errno
));
86 * Given a socket and a interface,
87 * Bind that socket to that interface
89 int pim_socket_bind(int fd
, struct interface
*ifp
)
92 #ifdef SO_BINDTODEVICE
94 if (pimd_privs
.change(ZPRIVS_RAISE
))
95 zlog_err("%s: could not raise privs, %s", __PRETTY_FUNCTION__
,
96 safe_strerror(errno
));
98 ret
= setsockopt(fd
, SOL_SOCKET
, SO_BINDTODEVICE
, ifp
->name
,
101 if (pimd_privs
.change(ZPRIVS_LOWER
))
102 zlog_err("%s: could not lower privs, %s", __PRETTY_FUNCTION__
,
103 safe_strerror(errno
));
109 int pim_socket_mcast(int protocol
, struct in_addr ifaddr
, struct interface
*ifp
,
112 int rcvbuf
= 1024 * 1024 * 8;
113 #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
114 struct ip_mreqn mreq
;
120 fd
= pim_socket_raw(protocol
);
122 zlog_warn("Could not create multicast socket: errno=%d: %s",
123 errno
, safe_strerror(errno
));
124 return PIM_SOCK_ERR_SOCKET
;
127 #ifdef SO_BINDTODEVICE
128 if (protocol
== IPPROTO_PIM
) {
131 ret
= pim_socket_bind(fd
, ifp
);
135 "Could not set fd: %d for interface: %s to device",
137 return PIM_SOCK_ERR_BIND
;
141 /* XXX: use IP_PKTINFO / IP_RECVIF to emulate behaviour? Or change to
142 * only use 1 socket for all interfaces? */
145 /* Needed to obtain destination address from recvmsg() */
147 #if defined(HAVE_IP_PKTINFO)
148 /* Linux and Solaris IP_PKTINFO */
150 if (setsockopt(fd
, IPPROTO_IP
, IP_PKTINFO
, &opt
, sizeof(opt
))) {
152 "Could not set IP_PKTINFO on socket fd=%d: errno=%d: %s",
153 fd
, errno
, safe_strerror(errno
));
155 #elif defined(HAVE_IP_RECVDSTADDR)
156 /* BSD IP_RECVDSTADDR */
158 if (setsockopt(fd
, IPPROTO_IP
, IP_RECVDSTADDR
, &opt
,
161 "Could not set IP_RECVDSTADDR on socket fd=%d: errno=%d: %s",
162 fd
, errno
, safe_strerror(errno
));
166 "%s %s: Missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()",
167 __FILE__
, __PRETTY_FUNCTION__
);
169 return PIM_SOCK_ERR_DSTADDR
;
174 /* Set router alert (RFC 2113) for all IGMP messages (RFC 3376 4.
176 if (protocol
== IPPROTO_IGMP
) {
182 if (setsockopt(fd
, IPPROTO_IP
, IP_OPTIONS
, ra
, 4)) {
184 "Could not set Router Alert Option on socket fd=%d: errno=%d: %s",
185 fd
, errno
, safe_strerror(errno
));
187 return PIM_SOCK_ERR_RA
;
193 if (setsockopt(fd
, SOL_SOCKET
, SO_REUSEADDR
, (void *)&reuse
,
196 "Could not set Reuse Address Option on socket fd=%d: errno=%d: %s",
197 fd
, errno
, safe_strerror(errno
));
199 return PIM_SOCK_ERR_REUSE
;
206 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, (void *)&ttl
,
209 "Could not set multicast TTL=%d on socket fd=%d: errno=%d: %s",
210 MTTL
, fd
, errno
, safe_strerror(errno
));
212 return PIM_SOCK_ERR_TTL
;
216 if (setsockopt_ipv4_multicast_loop(fd
, loop
)) {
218 "Could not %s Multicast Loopback Option on socket fd=%d: errno=%d: %s",
219 loop
? "enable" : "disable", fd
, errno
,
220 safe_strerror(errno
));
222 return PIM_SOCK_ERR_LOOP
;
225 memset(&mreq
, 0, sizeof(mreq
));
226 #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
227 mreq
.imr_ifindex
= ifp
->ifindex
;
230 * I am not sure what to do here yet for *BSD
232 // mreq.imr_interface = ifindex;
235 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_IF
, (void *)&mreq
,
238 "Could not set Outgoing Interface Option on socket fd=%d: errno=%d: %s",
239 fd
, errno
, safe_strerror(errno
));
241 return PIM_SOCK_ERR_IFACE
;
244 if (setsockopt(fd
, SOL_SOCKET
, SO_RCVBUF
, &rcvbuf
, sizeof(rcvbuf
)))
245 zlog_warn("%s: Failure to set buffer size to %d",
246 __PRETTY_FUNCTION__
, rcvbuf
);
251 flags
= fcntl(fd
, F_GETFL
, 0);
254 "Could not get fcntl(F_GETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
255 fd
, errno
, safe_strerror(errno
));
257 return PIM_SOCK_ERR_NONBLOCK_GETFL
;
260 if (fcntl(fd
, F_SETFL
, flags
| O_NONBLOCK
)) {
262 "Could not set fcntl(F_SETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
263 fd
, errno
, safe_strerror(errno
));
265 return PIM_SOCK_ERR_NONBLOCK_SETFL
;
272 int pim_socket_join(int fd
, struct in_addr group
, struct in_addr ifaddr
,
277 #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
283 opt
.imr_multiaddr
= group
;
285 #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
286 opt
.imr_address
= ifaddr
;
287 opt
.imr_ifindex
= ifindex
;
289 opt
.imr_interface
= ifaddr
;
292 ret
= setsockopt(fd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
, &opt
, sizeof(opt
));
294 char group_str
[INET_ADDRSTRLEN
];
295 char ifaddr_str
[INET_ADDRSTRLEN
];
296 if (!inet_ntop(AF_INET
, &group
, group_str
, sizeof(group_str
)))
297 sprintf(group_str
, "<group?>");
298 if (!inet_ntop(AF_INET
, &ifaddr
, ifaddr_str
,
300 sprintf(ifaddr_str
, "<ifaddr?>");
303 "Failure socket joining fd=%d group %s on interface address %s: errno=%d: %s",
304 fd
, group_str
, ifaddr_str
, errno
, safe_strerror(errno
));
308 if (PIM_DEBUG_TRACE
) {
309 char group_str
[INET_ADDRSTRLEN
];
310 char ifaddr_str
[INET_ADDRSTRLEN
];
311 if (!inet_ntop(AF_INET
, &group
, group_str
, sizeof(group_str
)))
312 sprintf(group_str
, "<group?>");
313 if (!inet_ntop(AF_INET
, &ifaddr
, ifaddr_str
,
315 sprintf(ifaddr_str
, "<ifaddr?>");
318 "Socket fd=%d joined group %s on interface address %s",
319 fd
, group_str
, ifaddr_str
);
325 int pim_socket_join_source(int fd
, ifindex_t ifindex
, struct in_addr group_addr
,
326 struct in_addr source_addr
, const char *ifname
)
328 if (pim_igmp_join_source(fd
, ifindex
, group_addr
, source_addr
)) {
329 char group_str
[INET_ADDRSTRLEN
];
330 char source_str
[INET_ADDRSTRLEN
];
331 pim_inet4_dump("<grp?>", group_addr
, group_str
,
333 pim_inet4_dump("<src?>", source_addr
, source_str
,
336 "%s: setsockopt(fd=%d) failure for IGMP group %s source %s ifindex %d on interface %s: errno=%d: %s",
337 __PRETTY_FUNCTION__
, fd
, group_str
, source_str
, ifindex
,
338 ifname
, errno
, safe_strerror(errno
));
345 int pim_socket_recvfromto(int fd
, uint8_t *buf
, size_t len
,
346 struct sockaddr_in
*from
, socklen_t
*fromlen
,
347 struct sockaddr_in
*to
, socklen_t
*tolen
,
351 struct cmsghdr
*cmsg
;
357 * IP_PKTINFO / IP_RECVDSTADDR don't yield sin_port.
358 * Use getsockname() to get sin_port.
361 struct sockaddr_in si
;
362 socklen_t si_len
= sizeof(si
);
364 memset(&si
, 0, sizeof(si
));
365 to
->sin_family
= AF_INET
;
367 pim_socket_getsockname(fd
, (struct sockaddr
*)&si
, &si_len
);
369 to
->sin_port
= si
.sin_port
;
370 to
->sin_addr
= si
.sin_addr
;
376 memset(&msgh
, 0, sizeof(struct msghdr
));
379 msgh
.msg_control
= cbuf
;
380 msgh
.msg_controllen
= sizeof(cbuf
);
381 msgh
.msg_name
= from
;
382 msgh
.msg_namelen
= fromlen
? *fromlen
: 0;
387 err
= recvmsg(fd
, &msgh
, 0);
392 *fromlen
= msgh
.msg_namelen
;
394 for (cmsg
= CMSG_FIRSTHDR(&msgh
); cmsg
!= NULL
;
395 cmsg
= CMSG_NXTHDR(&msgh
, cmsg
)) {
397 #ifdef HAVE_IP_PKTINFO
398 if ((cmsg
->cmsg_level
== IPPROTO_IP
)
399 && (cmsg
->cmsg_type
== IP_PKTINFO
)) {
400 struct in_pktinfo
*i
=
401 (struct in_pktinfo
*)CMSG_DATA(cmsg
);
403 ((struct sockaddr_in
*)to
)->sin_addr
=
406 *tolen
= sizeof(struct sockaddr_in
);
408 *ifindex
= i
->ipi_ifindex
;
414 #ifdef HAVE_IP_RECVDSTADDR
415 if ((cmsg
->cmsg_level
== IPPROTO_IP
)
416 && (cmsg
->cmsg_type
== IP_RECVDSTADDR
)) {
417 struct in_addr
*i
= (struct in_addr
*)CMSG_DATA(cmsg
);
419 ((struct sockaddr_in
*)to
)->sin_addr
= *i
;
421 *tolen
= sizeof(struct sockaddr_in
);
427 #if defined(HAVE_IP_RECVIF) && defined(CMSG_IFINDEX)
428 if (cmsg
->cmsg_type
== IP_RECVIF
)
430 *ifindex
= CMSG_IFINDEX(cmsg
);
435 return err
; /* len */
438 int pim_socket_mcastloop_get(int fd
)
441 socklen_t loop_len
= sizeof(loop
);
443 if (getsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &loop
, &loop_len
)) {
446 "Could not get Multicast Loopback Option on socket fd=%d: errno=%d: %s",
447 fd
, errno
, safe_strerror(errno
));
449 return PIM_SOCK_ERR_LOOP
;
455 int pim_socket_getsockname(int fd
, struct sockaddr
*name
, socklen_t
*namelen
)
457 if (getsockname(fd
, name
, namelen
)) {
460 "Could not get Socket Name for socket fd=%d: errno=%d: %s",
461 fd
, errno
, safe_strerror(errno
));
463 return PIM_SOCK_ERR_NAME
;
466 return PIM_SOCK_ERR_NONE
;