1 /* Set source filter. Linux version.
2 Copyright (C) 2004-2013 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@redhat.com>, 2004.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
24 #include <netinet/in.h>
25 #include <sys/socket.h>
28 /* Defined in getsourcefilter.c. */
29 extern int __get_sol (int af, socklen_t len);
33 setsourcefilter (int s, uint32_t interface, const struct sockaddr *group,
34 socklen_t grouplen, uint32_t fmode, uint32_t numsrc,
35 const struct sockaddr_storage *slist)
37 /* We have to create an struct ip_msfilter object which we can pass
39 size_t needed = GROUP_FILTER_SIZE (numsrc);
40 int use_alloca = __libc_use_alloca (needed);
42 struct group_filter *gf;
44 gf = (struct group_filter *) alloca (needed);
47 gf = (struct group_filter *) malloc (needed);
52 gf->gf_interface = interface;
53 memcpy (&gf->gf_group, group, grouplen);
55 gf->gf_numsrc = numsrc;
56 memcpy (gf->gf_slist, slist, numsrc * sizeof (struct sockaddr_storage));
58 /* We need to provide the appropriate socket level value. */
60 int sol = __get_sol (group->sa_family, grouplen);
67 result = __setsockopt (s, sol, MCAST_MSFILTER, gf, needed);
71 int save_errno = errno;
73 __set_errno (save_errno);