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1 | /* Set source filter. Linux version. | |
2 | Copyright (C) 2004-2019 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2004. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
18 | <https://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <alloca.h> | |
21 | #include <errno.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <stdint.h> | |
25 | #include <netinet/in.h> | |
26 | #include <sys/socket.h> | |
27 | #include "getsourcefilter.h" | |
28 | ||
29 | ||
30 | int | |
31 | setsourcefilter (int s, uint32_t interface, const struct sockaddr *group, | |
32 | socklen_t grouplen, uint32_t fmode, uint32_t numsrc, | |
33 | const struct sockaddr_storage *slist) | |
34 | { | |
35 | /* We have to create an struct ip_msfilter object which we can pass | |
36 | to the kernel. */ | |
37 | size_t needed = GROUP_FILTER_SIZE (numsrc); | |
38 | int use_alloca = __libc_use_alloca (needed); | |
39 | ||
40 | struct group_filter *gf; | |
41 | if (use_alloca) | |
42 | gf = (struct group_filter *) alloca (needed); | |
43 | else | |
44 | { | |
45 | gf = (struct group_filter *) malloc (needed); | |
46 | if (gf == NULL) | |
47 | return -1; | |
48 | } | |
49 | ||
50 | gf->gf_interface = interface; | |
51 | memcpy (&gf->gf_group, group, grouplen); | |
52 | gf->gf_fmode = fmode; | |
53 | gf->gf_numsrc = numsrc; | |
54 | memcpy (gf->gf_slist, slist, numsrc * sizeof (struct sockaddr_storage)); | |
55 | ||
56 | /* We need to provide the appropriate socket level value. */ | |
57 | int result; | |
58 | int sol = __get_sol (group->sa_family, grouplen); | |
59 | if (sol == -1) | |
60 | { | |
61 | __set_errno (EINVAL); | |
62 | result = -1; | |
63 | } | |
64 | else | |
65 | result = __setsockopt (s, sol, MCAST_MSFILTER, gf, needed); | |
66 | ||
67 | if (! use_alloca) | |
68 | { | |
69 | int save_errno = errno; | |
70 | free (gf); | |
71 | __set_errno (save_errno); | |
72 | } | |
73 | ||
74 | return result; | |
75 | } |