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489aa29d | 1 | /* Set IPv4 source filter. Linux version. |
04277e02 | 2 | Copyright (C) 2004-2019 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 | ||
29 | int | |
30 | setipv4sourcefilter (int s, struct in_addr interface, struct in_addr group, | |
d3c99ad1 UD |
31 | uint32_t fmode, uint32_t numsrc, |
32 | const struct in_addr *slist) | |
489aa29d UD |
33 | { |
34 | /* We have to create an struct ip_msfilter object which we can pass | |
35 | to the kernel. */ | |
36 | size_t needed = IP_MSFILTER_SIZE (numsrc); | |
9030e7c4 | 37 | int use_alloca = __libc_use_alloca (needed); |
489aa29d UD |
38 | |
39 | struct ip_msfilter *imsf; | |
9030e7c4 UD |
40 | if (use_alloca) |
41 | imsf = (struct ip_msfilter *) alloca (needed); | |
42 | else | |
489aa29d UD |
43 | { |
44 | imsf = (struct ip_msfilter *) malloc (needed); | |
45 | if (imsf == NULL) | |
46 | return -1; | |
47 | } | |
489aa29d UD |
48 | |
49 | imsf->imsf_multiaddr = group; | |
50 | imsf->imsf_interface = interface; | |
51 | imsf->imsf_fmode = fmode; | |
52 | imsf->imsf_numsrc = numsrc; | |
53 | memcpy (imsf->imsf_slist, slist, numsrc * sizeof (struct in_addr)); | |
54 | ||
55 | int result = __setsockopt (s, SOL_IP, IP_MSFILTER, imsf, needed); | |
56 | ||
9030e7c4 | 57 | if (! use_alloca) |
489aa29d UD |
58 | { |
59 | int save_errno = errno; | |
60 | free (imsf); | |
61 | __set_errno (save_errno); | |
62 | } | |
63 | ||
64 | return result; | |
65 | } |