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489aa29d | 1 | /* Set IPv4 source filter. Linux version. |
dff8da6b | 2 | Copyright (C) 2004-2024 Free Software Foundation, Inc. |
489aa29d | 3 | This file is part of the GNU C Library. |
489aa29d UD |
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 | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
489aa29d | 18 | |
489aa29d UD |
19 | #include <errno.h> |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
e054f494 | 22 | #include <stdint.h> |
489aa29d | 23 | #include <netinet/in.h> |
02f3d4c5 | 24 | #include <scratch_buffer.h> |
489aa29d UD |
25 | #include <sys/socket.h> |
26 | ||
27 | ||
28 | int | |
29 | setipv4sourcefilter (int s, struct in_addr interface, struct in_addr group, | |
d3c99ad1 UD |
30 | uint32_t fmode, uint32_t numsrc, |
31 | const struct in_addr *slist) | |
489aa29d UD |
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); | |
489aa29d | 36 | |
02f3d4c5 JST |
37 | struct scratch_buffer buf; |
38 | scratch_buffer_init (&buf); | |
39 | if (!scratch_buffer_set_array_size (&buf, 1, needed)) | |
40 | return -1; | |
41 | struct ip_msfilter *imsf = buf.data; | |
489aa29d UD |
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 | ||
02f3d4c5 | 51 | scratch_buffer_free (&buf); |
489aa29d UD |
52 | |
53 | return result; | |
54 | } |