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/* Set IPv4 source filter. Linux version.
Copyright (C) 2004-2014 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>
int
setipv4sourcefilter (int s, struct in_addr interface, struct in_addr group,
uint32_t fmode, uint32_t numsrc,
const struct in_addr *slist)
{
/* We have to create an struct ip_msfilter object which we can pass
to the kernel. */
size_t needed = IP_MSFILTER_SIZE (numsrc);
int use_alloca = __libc_use_alloca (needed);
struct ip_msfilter *imsf;
if (use_alloca)
imsf = (struct ip_msfilter *) alloca (needed);
else
{
imsf = (struct ip_msfilter *) malloc (needed);
if (imsf == NULL)
return -1;
}
imsf->imsf_multiaddr = group;
imsf->imsf_interface = interface;
imsf->imsf_fmode = fmode;
imsf->imsf_numsrc = numsrc;
memcpy (imsf->imsf_slist, slist, numsrc * sizeof (struct in_addr));
int result = __setsockopt (s, SOL_IP, IP_MSFILTER, imsf, needed);
if (! use_alloca)
{
int save_errno = errno;
free (imsf);
__set_errno (save_errno);
}
return result;
}
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