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489aa29d | 1 | /* Set source filter. Linux version. |
f7a9f785 | 2 | Copyright (C) 2004-2016 Free Software Foundation, Inc. |
489aa29d UD |
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 | |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
489aa29d UD |
19 | |
20 | #include <alloca.h> | |
21 | #include <errno.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
e054f494 | 24 | #include <stdint.h> |
489aa29d UD |
25 | #include <netinet/in.h> |
26 | #include <sys/socket.h> | |
27 | ||
28 | ||
9030e7c4 UD |
29 | /* Defined in getsourcefilter.c. */ |
30 | extern int __get_sol (int af, socklen_t len); | |
31 | ||
32 | ||
489aa29d | 33 | int |
d3c99ad1 | 34 | setsourcefilter (int s, uint32_t interface, const struct sockaddr *group, |
489aa29d | 35 | socklen_t grouplen, uint32_t fmode, uint32_t numsrc, |
d3c99ad1 | 36 | const struct sockaddr_storage *slist) |
489aa29d UD |
37 | { |
38 | /* We have to create an struct ip_msfilter object which we can pass | |
39 | to the kernel. */ | |
40 | size_t needed = GROUP_FILTER_SIZE (numsrc); | |
9030e7c4 | 41 | int use_alloca = __libc_use_alloca (needed); |
489aa29d UD |
42 | |
43 | struct group_filter *gf; | |
9030e7c4 UD |
44 | if (use_alloca) |
45 | gf = (struct group_filter *) alloca (needed); | |
46 | else | |
489aa29d UD |
47 | { |
48 | gf = (struct group_filter *) malloc (needed); | |
49 | if (gf == NULL) | |
50 | return -1; | |
51 | } | |
489aa29d UD |
52 | |
53 | gf->gf_interface = interface; | |
54 | memcpy (&gf->gf_group, group, grouplen); | |
55 | gf->gf_fmode = fmode; | |
56 | gf->gf_numsrc = numsrc; | |
57 | memcpy (gf->gf_slist, slist, numsrc * sizeof (struct sockaddr_storage)); | |
58 | ||
9030e7c4 | 59 | /* We need to provide the appropriate socket level value. */ |
0292b0dd | 60 | int result; |
9030e7c4 UD |
61 | int sol = __get_sol (group->sa_family, grouplen); |
62 | if (sol == -1) | |
63 | { | |
64 | __set_errno (EINVAL); | |
0292b0dd | 65 | result = -1; |
9030e7c4 | 66 | } |
0292b0dd UD |
67 | else |
68 | result = __setsockopt (s, sol, MCAST_MSFILTER, gf, needed); | |
489aa29d | 69 | |
9030e7c4 | 70 | if (! use_alloca) |
489aa29d UD |
71 | { |
72 | int save_errno = errno; | |
73 | free (gf); | |
74 | __set_errno (save_errno); | |
75 | } | |
76 | ||
77 | return result; | |
78 | } |