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 if (protocol
== IPPROTO_PIM
)
85 struct interface
*ifp
= NULL
;
87 ifp
= if_lookup_by_index_vrf (ifindex
, VRF_DEFAULT
);
89 if (pimd_privs
.change (ZPRIVS_RAISE
))
90 zlog_err ("%s: could not raise privs, %s",
91 __PRETTY_FUNCTION__
, safe_strerror (errno
));
93 ret
= setsockopt (fd
, SOL_SOCKET
,
94 SO_BINDTODEVICE
, ifp
->name
, strlen (ifp
->name
));
96 if (pimd_privs
.change (ZPRIVS_LOWER
))
97 zlog_err ("%s: could not lower privs, %s",
98 __PRETTY_FUNCTION__
, safe_strerror (errno
));
102 zlog_warn("Could not set fd: %d for interface: %s to device",
104 return PIM_SOCK_ERR_BIND
;
109 /* Needed to obtain destination address from recvmsg() */
111 #if defined(HAVE_IP_PKTINFO)
112 /* Linux and Solaris IP_PKTINFO */
114 if (setsockopt(fd
, IPPROTO_IP
, IP_PKTINFO
, &opt
, sizeof(opt
))) {
115 zlog_warn("Could not set IP_PKTINFO on socket fd=%d: errno=%d: %s",
116 fd
, errno
, safe_strerror(errno
));
118 #elif defined(HAVE_IP_RECVDSTADDR)
119 /* BSD IP_RECVDSTADDR */
121 if (setsockopt(fd
, IPPROTO_IP
, IP_RECVDSTADDR
, &opt
, sizeof(opt
))) {
122 zlog_warn("Could not set IP_RECVDSTADDR on socket fd=%d: errno=%d: %s",
123 fd
, errno
, safe_strerror(errno
));
126 zlog_err("%s %s: Missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()",
127 __FILE__
, __PRETTY_FUNCTION__
);
129 return PIM_SOCK_ERR_DSTADDR
;
134 /* Set router alert (RFC 2113) for all IGMP messages (RFC 3376 4. Message Formats)*/
135 if (protocol
== IPPROTO_IGMP
) {
141 if (setsockopt(fd
, IPPROTO_IP
, IP_OPTIONS
, ra
, 4)) {
142 zlog_warn("Could not set Router Alert Option on socket fd=%d: errno=%d: %s",
143 fd
, errno
, safe_strerror(errno
));
145 return PIM_SOCK_ERR_RA
;
151 if (setsockopt(fd
, SOL_SOCKET
, SO_REUSEADDR
,
152 (void *) &reuse
, sizeof(reuse
))) {
153 zlog_warn("Could not set Reuse Address Option on socket fd=%d: errno=%d: %s",
154 fd
, errno
, safe_strerror(errno
));
156 return PIM_SOCK_ERR_REUSE
;
163 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_TTL
,
164 (void *) &ttl
, sizeof(ttl
))) {
165 zlog_warn("Could not set multicast TTL=%d on socket fd=%d: errno=%d: %s",
166 MTTL
, fd
, errno
, safe_strerror(errno
));
168 return PIM_SOCK_ERR_TTL
;
172 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
,
173 (void *) &loop
, sizeof(loop
))) {
174 zlog_warn("Could not %s Multicast Loopback Option on socket fd=%d: errno=%d: %s",
175 loop
? "enable" : "disable",
176 fd
, errno
, safe_strerror(errno
));
178 return PIM_SOCK_ERR_LOOP
;
181 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_IF
,
182 (void *) &ifaddr
, sizeof(ifaddr
))) {
183 zlog_warn("Could not set Outgoing Interface Option on socket fd=%d: errno=%d: %s",
184 fd
, errno
, safe_strerror(errno
));
186 return PIM_SOCK_ERR_IFACE
;
192 flags
= fcntl(fd
, F_GETFL
, 0);
194 zlog_warn("Could not get fcntl(F_GETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
195 fd
, errno
, safe_strerror(errno
));
197 return PIM_SOCK_ERR_NONBLOCK_GETFL
;
200 if (fcntl(fd
, F_SETFL
, flags
| O_NONBLOCK
)) {
201 zlog_warn("Could not set fcntl(F_SETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
202 fd
, errno
, safe_strerror(errno
));
204 return PIM_SOCK_ERR_NONBLOCK_SETFL
;
211 int pim_socket_join(int fd
, struct in_addr group
,
212 struct in_addr ifaddr
, int ifindex
)
216 #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
222 opt
.imr_multiaddr
= group
;
224 #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
225 opt
.imr_address
= ifaddr
;
226 opt
.imr_ifindex
= ifindex
;
228 opt
.imr_interface
= ifaddr
;
231 ret
= setsockopt(fd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
, &opt
, sizeof(opt
));
234 char ifaddr_str
[100];
235 if (!inet_ntop(AF_INET
, &group
, group_str
, sizeof(group_str
)))
236 sprintf(group_str
, "<group?>");
237 if (!inet_ntop(AF_INET
, &ifaddr
, ifaddr_str
, sizeof(ifaddr_str
)))
238 sprintf(ifaddr_str
, "<ifaddr?>");
240 zlog_err("Failure socket joining fd=%d group %s on interface address %s: errno=%d: %s",
241 fd
, group_str
, ifaddr_str
, errno
, safe_strerror(errno
));
245 if (PIM_DEBUG_TRACE
) {
247 char ifaddr_str
[100];
248 if (!inet_ntop(AF_INET
, &group
, group_str
, sizeof(group_str
)))
249 sprintf(group_str
, "<group?>");
250 if (!inet_ntop(AF_INET
, &ifaddr
, ifaddr_str
, sizeof(ifaddr_str
)))
251 sprintf(ifaddr_str
, "<ifaddr?>");
253 zlog_debug("Socket fd=%d joined group %s on interface address %s",
254 fd
, group_str
, ifaddr_str
);
260 int pim_socket_join_source(int fd
, int ifindex
,
261 struct in_addr group_addr
,
262 struct in_addr source_addr
,
265 if (pim_igmp_join_source(fd
, ifindex
, group_addr
, source_addr
)) {
268 char source_str
[100];
269 pim_inet4_dump("<grp?>", group_addr
, group_str
, sizeof(group_str
));
270 pim_inet4_dump("<src?>", source_addr
, source_str
, sizeof(source_str
));
271 zlog_warn("%s: setsockopt(fd=%d) failure for IGMP group %s source %s ifindex %d on interface %s: errno=%d: %s",
273 fd
, group_str
, source_str
, ifindex
, ifname
,
274 e
, safe_strerror(e
));
281 int pim_socket_recvfromto(int fd
, uint8_t *buf
, size_t len
,
282 struct sockaddr_in
*from
, socklen_t
*fromlen
,
283 struct sockaddr_in
*to
, socklen_t
*tolen
,
287 struct cmsghdr
*cmsg
;
293 * IP_PKTINFO / IP_RECVDSTADDR don't yield sin_port.
294 * Use getsockname() to get sin_port.
297 struct sockaddr_in si
;
298 socklen_t si_len
= sizeof(si
);
300 ((struct sockaddr_in
*) to
)->sin_family
= AF_INET
;
302 if (pim_socket_getsockname(fd
, (struct sockaddr
*) &si
, &si_len
)) {
303 ((struct sockaddr_in
*) to
)->sin_port
= ntohs(0);
304 ((struct sockaddr_in
*) to
)->sin_addr
.s_addr
= ntohl(0);
307 ((struct sockaddr_in
*) to
)->sin_port
= si
.sin_port
;
308 ((struct sockaddr_in
*) to
)->sin_addr
= si
.sin_addr
;
315 memset(&msgh
, 0, sizeof(struct msghdr
));
318 msgh
.msg_control
= cbuf
;
319 msgh
.msg_controllen
= sizeof(cbuf
);
320 msgh
.msg_name
= from
;
321 msgh
.msg_namelen
= fromlen
? *fromlen
: 0;
326 err
= recvmsg(fd
, &msgh
, 0);
331 *fromlen
= msgh
.msg_namelen
;
333 for (cmsg
= CMSG_FIRSTHDR(&msgh
);
335 cmsg
= CMSG_NXTHDR(&msgh
,cmsg
)) {
337 #ifdef HAVE_IP_PKTINFO
338 if ((cmsg
->cmsg_level
== IPPROTO_IP
) && (cmsg
->cmsg_type
== IP_PKTINFO
)) {
339 struct in_pktinfo
*i
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
341 ((struct sockaddr_in
*) to
)->sin_addr
= i
->ipi_addr
;
343 *tolen
= sizeof(struct sockaddr_in
);
345 *ifindex
= i
->ipi_ifindex
;
347 if (to
&& PIM_DEBUG_PACKETS
) {
349 pim_inet4_dump("<to?>", to
->sin_addr
, to_str
, sizeof(to_str
));
350 zlog_debug("%s: HAVE_IP_PKTINFO to=%s,%d",
352 to_str
, ntohs(to
->sin_port
));
359 #ifdef HAVE_IP_RECVDSTADDR
360 if ((cmsg
->cmsg_level
== IPPROTO_IP
) && (cmsg
->cmsg_type
== IP_RECVDSTADDR
)) {
361 struct in_addr
*i
= (struct in_addr
*) CMSG_DATA(cmsg
);
363 ((struct sockaddr_in
*) to
)->sin_addr
= *i
;
365 *tolen
= sizeof(struct sockaddr_in
);
367 if (to
&& PIM_DEBUG_PACKETS
) {
369 pim_inet4_dump("<to?>", to
->sin_addr
, to_str
, sizeof(to_str
));
370 zlog_debug("%s: HAVE_IP_RECVDSTADDR to=%s,%d",
372 to_str
, ntohs(to
->sin_port
));
379 #if defined(HAVE_IP_RECVIF) && defined(CMSG_IFINDEX)
380 if (cmsg
->cmsg_type
== IP_RECVIF
)
382 *ifindex
= CMSG_IFINDEX(cmsg
);
387 return err
; /* len */
390 int pim_socket_mcastloop_get(int fd
)
393 socklen_t loop_len
= sizeof(loop
);
395 if (getsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
,
398 zlog_warn("Could not get Multicast Loopback Option on socket fd=%d: errno=%d: %s",
399 fd
, errno
, safe_strerror(errno
));
401 return PIM_SOCK_ERR_LOOP
;
407 int pim_socket_getsockname(int fd
, struct sockaddr
*name
, socklen_t
*namelen
)
409 if (getsockname(fd
, name
, namelen
)) {
411 zlog_warn("Could not get Socket Name for socket fd=%d: errno=%d: %s",
412 fd
, errno
, safe_strerror(errno
));
414 return PIM_SOCK_ERR_NAME
;
417 return PIM_SOCK_ERR_NONE
;