1 | /* Set 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 <string.h> |
21 | #include <netinet/in.h> |
22 | #include <scratch_buffer.h> |
23 | #include "getsourcefilter.h" |
24 | |
25 | |
26 | int |
27 | setsourcefilter (int s, uint32_t interface, const struct sockaddr *group, |
28 | socklen_t grouplen, uint32_t fmode, uint32_t numsrc, |
29 | const struct sockaddr_storage *slist) |
30 | { |
31 | /* We have to create an struct ip_msfilter object which we can pass |
32 | to the kernel. */ |
33 | size_t needed = GROUP_FILTER_SIZE (numsrc); |
34 | |
35 | struct scratch_buffer buf; |
36 | scratch_buffer_init (buffer: &buf); |
37 | if (!scratch_buffer_set_array_size (buffer: &buf, nelem: 1, size: needed)) |
38 | return -1; |
39 | struct group_filter *gf = buf.data; |
40 | |
41 | gf->gf_interface = interface; |
42 | memcpy (&gf->gf_group, group, grouplen); |
43 | gf->gf_fmode = fmode; |
44 | gf->gf_numsrc = numsrc; |
45 | memcpy (gf->gf_slist, slist, numsrc * sizeof (struct sockaddr_storage)); |
46 | |
47 | /* We need to provide the appropriate socket level value. */ |
48 | int result; |
49 | int sol = __get_sol (af: group->sa_family, len: grouplen); |
50 | if (sol == -1) |
51 | { |
52 | __set_errno (EINVAL); |
53 | result = -1; |
54 | } |
55 | else |
56 | result = __setsockopt (s, sol, MCAST_MSFILTER, gf, needed); |
57 | |
58 | scratch_buffer_free (buffer: &buf); |
59 | |
60 | return result; |
61 | } |
62 | |