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
16 along with this program; see the file COPYING; if not, write to the
17 Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
20 $QuaggaId: $Format:%an, %ai, %h$ $
25 #include <sys/types.h>
26 #include <sys/socket.h>
27 #include <netinet/in.h>
28 #include <netinet/igmp.h>
29 #include <arpa/inet.h>
40 #include "pim_mroute.h"
43 #include "pim_igmp_join.h"
46 extern struct zebra_privs_t pimd_privs
;
48 int pim_socket_raw(int protocol
)
52 if ( pimd_privs
.change (ZPRIVS_RAISE
) )
53 zlog_err ("pim_sockek_raw: could not raise privs, %s",
54 safe_strerror (errno
) );
56 fd
= socket(AF_INET
, SOCK_RAW
, protocol
);
58 if ( pimd_privs
.change (ZPRIVS_LOWER
) )
59 zlog_err ("pim_socket_raw: could not lower privs, %s",
60 safe_strerror (errno
) );
63 zlog_warn("Could not create raw socket: errno=%d: %s",
64 errno
, safe_strerror(errno
));
65 return PIM_SOCK_ERR_SOCKET
;
71 int pim_socket_mcast(int protocol
, struct in_addr ifaddr
, int ifindex
, int loop
)
75 fd
= pim_socket_raw(protocol
);
77 zlog_warn("Could not create multicast socket: errno=%d: %s",
78 errno
, safe_strerror(errno
));
79 return PIM_SOCK_ERR_SOCKET
;
82 #ifdef SO_BINDTODEVICE
83 if (protocol
== IPPROTO_PIM
)
86 struct interface
*ifp
= NULL
;
88 ifp
= if_lookup_by_index_vrf (ifindex
, VRF_DEFAULT
);
90 if (pimd_privs
.change (ZPRIVS_RAISE
))
91 zlog_err ("%s: could not raise privs, %s",
92 __PRETTY_FUNCTION__
, safe_strerror (errno
));
94 ret
= setsockopt (fd
, SOL_SOCKET
,
95 SO_BINDTODEVICE
, ifp
->name
, strlen (ifp
->name
));
97 if (pimd_privs
.change (ZPRIVS_LOWER
))
98 zlog_err ("%s: could not lower privs, %s",
99 __PRETTY_FUNCTION__
, safe_strerror (errno
));
103 zlog_warn("Could not set fd: %d for interface: %s to device",
105 return PIM_SOCK_ERR_BIND
;
109 /* XXX: use IP_PKTINFO / IP_RECVIF to emulate behaviour? Or change to
110 * only use 1 socket for all interfaces? */
113 /* Needed to obtain destination address from recvmsg() */
115 #if defined(HAVE_IP_PKTINFO)
116 /* Linux and Solaris IP_PKTINFO */
118 if (setsockopt(fd
, IPPROTO_IP
, IP_PKTINFO
, &opt
, sizeof(opt
))) {
119 zlog_warn("Could not set IP_PKTINFO on socket fd=%d: errno=%d: %s",
120 fd
, errno
, safe_strerror(errno
));
122 #elif defined(HAVE_IP_RECVDSTADDR)
123 /* BSD IP_RECVDSTADDR */
125 if (setsockopt(fd
, IPPROTO_IP
, IP_RECVDSTADDR
, &opt
, sizeof(opt
))) {
126 zlog_warn("Could not set IP_RECVDSTADDR on socket fd=%d: errno=%d: %s",
127 fd
, errno
, safe_strerror(errno
));
130 zlog_err("%s %s: Missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()",
131 __FILE__
, __PRETTY_FUNCTION__
);
133 return PIM_SOCK_ERR_DSTADDR
;
138 /* Set router alert (RFC 2113) for all IGMP messages (RFC 3376 4. Message Formats)*/
139 if (protocol
== IPPROTO_IGMP
) {
145 if (setsockopt(fd
, IPPROTO_IP
, IP_OPTIONS
, ra
, 4)) {
146 zlog_warn("Could not set Router Alert Option on socket fd=%d: errno=%d: %s",
147 fd
, errno
, safe_strerror(errno
));
149 return PIM_SOCK_ERR_RA
;
155 if (setsockopt(fd
, SOL_SOCKET
, SO_REUSEADDR
,
156 (void *) &reuse
, sizeof(reuse
))) {
157 zlog_warn("Could not set Reuse Address Option on socket fd=%d: errno=%d: %s",
158 fd
, errno
, safe_strerror(errno
));
160 return PIM_SOCK_ERR_REUSE
;
167 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_TTL
,
168 (void *) &ttl
, sizeof(ttl
))) {
169 zlog_warn("Could not set multicast TTL=%d on socket fd=%d: errno=%d: %s",
170 MTTL
, fd
, errno
, safe_strerror(errno
));
172 return PIM_SOCK_ERR_TTL
;
176 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
,
177 (void *) &loop
, sizeof(loop
))) {
178 zlog_warn("Could not %s Multicast Loopback Option on socket fd=%d: errno=%d: %s",
179 loop
? "enable" : "disable",
180 fd
, errno
, safe_strerror(errno
));
182 return PIM_SOCK_ERR_LOOP
;
185 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_IF
,
186 (void *) &ifaddr
, sizeof(ifaddr
))) {
187 zlog_warn("Could not set Outgoing Interface Option on socket fd=%d: errno=%d: %s",
188 fd
, errno
, safe_strerror(errno
));
190 return PIM_SOCK_ERR_IFACE
;
196 flags
= fcntl(fd
, F_GETFL
, 0);
198 zlog_warn("Could not get fcntl(F_GETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
199 fd
, errno
, safe_strerror(errno
));
201 return PIM_SOCK_ERR_NONBLOCK_GETFL
;
204 if (fcntl(fd
, F_SETFL
, flags
| O_NONBLOCK
)) {
205 zlog_warn("Could not set fcntl(F_SETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
206 fd
, errno
, safe_strerror(errno
));
208 return PIM_SOCK_ERR_NONBLOCK_SETFL
;
215 int pim_socket_join(int fd
, struct in_addr group
,
216 struct in_addr ifaddr
, ifindex_t ifindex
)
220 #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
226 opt
.imr_multiaddr
= group
;
228 #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
229 opt
.imr_address
= ifaddr
;
230 opt
.imr_ifindex
= ifindex
;
232 opt
.imr_interface
= ifaddr
;
235 ret
= setsockopt(fd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
, &opt
, sizeof(opt
));
238 char ifaddr_str
[100];
239 if (!inet_ntop(AF_INET
, &group
, group_str
, sizeof(group_str
)))
240 sprintf(group_str
, "<group?>");
241 if (!inet_ntop(AF_INET
, &ifaddr
, ifaddr_str
, sizeof(ifaddr_str
)))
242 sprintf(ifaddr_str
, "<ifaddr?>");
244 zlog_err("Failure socket joining fd=%d group %s on interface address %s: errno=%d: %s",
245 fd
, group_str
, ifaddr_str
, errno
, safe_strerror(errno
));
249 if (PIM_DEBUG_TRACE
) {
251 char ifaddr_str
[100];
252 if (!inet_ntop(AF_INET
, &group
, group_str
, sizeof(group_str
)))
253 sprintf(group_str
, "<group?>");
254 if (!inet_ntop(AF_INET
, &ifaddr
, ifaddr_str
, sizeof(ifaddr_str
)))
255 sprintf(ifaddr_str
, "<ifaddr?>");
257 zlog_debug("Socket fd=%d joined group %s on interface address %s",
258 fd
, group_str
, ifaddr_str
);
264 int pim_socket_join_source(int fd
, ifindex_t ifindex
,
265 struct in_addr group_addr
,
266 struct in_addr source_addr
,
269 if (pim_igmp_join_source(fd
, ifindex
, group_addr
, source_addr
)) {
272 char source_str
[100];
273 pim_inet4_dump("<grp?>", group_addr
, group_str
, sizeof(group_str
));
274 pim_inet4_dump("<src?>", source_addr
, source_str
, sizeof(source_str
));
275 zlog_warn("%s: setsockopt(fd=%d) failure for IGMP group %s source %s ifindex %d on interface %s: errno=%d: %s",
277 fd
, group_str
, source_str
, ifindex
, ifname
,
278 e
, safe_strerror(e
));
285 int pim_socket_recvfromto(int fd
, uint8_t *buf
, size_t len
,
286 struct sockaddr_in
*from
, socklen_t
*fromlen
,
287 struct sockaddr_in
*to
, socklen_t
*tolen
,
291 struct cmsghdr
*cmsg
;
297 * IP_PKTINFO / IP_RECVDSTADDR don't yield sin_port.
298 * Use getsockname() to get sin_port.
301 struct sockaddr_in si
;
302 socklen_t si_len
= sizeof(si
);
304 ((struct sockaddr_in
*) to
)->sin_family
= AF_INET
;
306 if (pim_socket_getsockname(fd
, (struct sockaddr
*) &si
, &si_len
)) {
307 ((struct sockaddr_in
*) to
)->sin_port
= ntohs(0);
308 ((struct sockaddr_in
*) to
)->sin_addr
.s_addr
= ntohl(0);
311 ((struct sockaddr_in
*) to
)->sin_port
= si
.sin_port
;
312 ((struct sockaddr_in
*) to
)->sin_addr
= si
.sin_addr
;
319 memset(&msgh
, 0, sizeof(struct msghdr
));
322 msgh
.msg_control
= cbuf
;
323 msgh
.msg_controllen
= sizeof(cbuf
);
324 msgh
.msg_name
= from
;
325 msgh
.msg_namelen
= fromlen
? *fromlen
: 0;
330 err
= recvmsg(fd
, &msgh
, 0);
335 *fromlen
= msgh
.msg_namelen
;
337 for (cmsg
= CMSG_FIRSTHDR(&msgh
);
339 cmsg
= CMSG_NXTHDR(&msgh
,cmsg
)) {
341 #ifdef HAVE_IP_PKTINFO
342 if ((cmsg
->cmsg_level
== IPPROTO_IP
) && (cmsg
->cmsg_type
== IP_PKTINFO
)) {
343 struct in_pktinfo
*i
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
345 ((struct sockaddr_in
*) to
)->sin_addr
= i
->ipi_addr
;
347 *tolen
= sizeof(struct sockaddr_in
);
349 *ifindex
= i
->ipi_ifindex
;
351 if (to
&& PIM_DEBUG_PACKETS
) {
353 pim_inet4_dump("<to?>", to
->sin_addr
, to_str
, sizeof(to_str
));
354 zlog_debug("%s: HAVE_IP_PKTINFO to=%s,%d",
356 to_str
, ntohs(to
->sin_port
));
363 #ifdef HAVE_IP_RECVDSTADDR
364 if ((cmsg
->cmsg_level
== IPPROTO_IP
) && (cmsg
->cmsg_type
== IP_RECVDSTADDR
)) {
365 struct in_addr
*i
= (struct in_addr
*) CMSG_DATA(cmsg
);
367 ((struct sockaddr_in
*) to
)->sin_addr
= *i
;
369 *tolen
= sizeof(struct sockaddr_in
);
371 if (to
&& PIM_DEBUG_PACKETS
) {
373 pim_inet4_dump("<to?>", to
->sin_addr
, to_str
, sizeof(to_str
));
374 zlog_debug("%s: HAVE_IP_RECVDSTADDR to=%s,%d",
376 to_str
, ntohs(to
->sin_port
));
383 #if defined(HAVE_IP_RECVIF) && defined(CMSG_IFINDEX)
384 if (cmsg
->cmsg_type
== IP_RECVIF
)
386 *ifindex
= CMSG_IFINDEX(cmsg
);
391 return err
; /* len */
394 int pim_socket_mcastloop_get(int fd
)
397 socklen_t loop_len
= sizeof(loop
);
399 if (getsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
,
402 zlog_warn("Could not get Multicast Loopback Option on socket fd=%d: errno=%d: %s",
403 fd
, errno
, safe_strerror(errno
));
405 return PIM_SOCK_ERR_LOOP
;
411 int pim_socket_getsockname(int fd
, struct sockaddr
*name
, socklen_t
*namelen
)
413 if (getsockname(fd
, name
, namelen
)) {
415 zlog_warn("Could not get Socket Name for socket fd=%d: errno=%d: %s",
416 fd
, errno
, safe_strerror(errno
));
418 return PIM_SOCK_ERR_NAME
;
421 return PIM_SOCK_ERR_NONE
;