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/* Set source filter. Linux version.
Copyright (C) 2004-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2004.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <alloca.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <netinet/in.h>
#include <sys/socket.h>
/* Defined in getsourcefilter.c. */
extern int __get_sol (int af, socklen_t len);
int
setsourcefilter (int s, uint32_t interface, const struct sockaddr *group,
socklen_t grouplen, uint32_t fmode, uint32_t numsrc,
const struct sockaddr_storage *slist)
{
/* We have to create an struct ip_msfilter object which we can pass
to the kernel. */
size_t needed = GROUP_FILTER_SIZE (numsrc);
int use_alloca = __libc_use_alloca (needed);
struct group_filter *gf;
if (use_alloca)
gf = (struct group_filter *) alloca (needed);
else
{
gf = (struct group_filter *) malloc (needed);
if (gf == NULL)
return -1;
}
gf->gf_interface = interface;
memcpy (&gf->gf_group, group, grouplen);
gf->gf_fmode = fmode;
gf->gf_numsrc = numsrc;
memcpy (gf->gf_slist, slist, numsrc * sizeof (struct sockaddr_storage));
/* We need to provide the appropriate socket level value. */
int result;
int sol = __get_sol (group->sa_family, grouplen);
if (sol == -1)
{
__set_errno (EINVAL);
result = -1;
}
else
result = __setsockopt (s, sol, MCAST_MSFILTER, gf, needed);
if (! use_alloca)
{
int save_errno = errno;
free (gf);
__set_errno (save_errno);
}
return result;
}
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