1 | /* Set IPv4 source filter. Linux version. |
2 | Copyright (C) 2004-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <errno.h> |
20 | #include <stdlib.h> |
21 | #include <string.h> |
22 | #include <stdint.h> |
23 | #include <netinet/in.h> |
24 | #include <scratch_buffer.h> |
25 | #include <sys/socket.h> |
26 | |
27 | |
28 | int |
29 | setipv4sourcefilter (int s, struct in_addr interface, struct in_addr group, |
30 | uint32_t fmode, uint32_t numsrc, |
31 | const struct in_addr *slist) |
32 | { |
33 | /* We have to create an struct ip_msfilter object which we can pass |
34 | to the kernel. */ |
35 | size_t needed = IP_MSFILTER_SIZE (numsrc); |
36 | |
37 | struct scratch_buffer buf; |
38 | scratch_buffer_init (buffer: &buf); |
39 | if (!scratch_buffer_set_array_size (buffer: &buf, nelem: 1, size: needed)) |
40 | return -1; |
41 | struct ip_msfilter *imsf = buf.data; |
42 | |
43 | imsf->imsf_multiaddr = group; |
44 | imsf->imsf_interface = interface; |
45 | imsf->imsf_fmode = fmode; |
46 | imsf->imsf_numsrc = numsrc; |
47 | memcpy (imsf->imsf_slist, slist, numsrc * sizeof (struct in_addr)); |
48 | |
49 | int result = __setsockopt (s, SOL_IP, IP_MSFILTER, imsf, needed); |
50 | |
51 | scratch_buffer_free (buffer: &buf); |
52 | |
53 | return result; |
54 | } |
55 | |