]> git.proxmox.com Git - mirror_frr.git/blob - isisd/isis_flags.c
Merge pull request #5305 from ton31337/feature/draft-ietf-idr-deprecate-as-set-confed-set
[mirror_frr.git] / isisd / isis_flags.c
1 /*
2 * IS-IS Rout(e)ing protocol - isis_flags.c
3 * Routines for manipulation of SSN and SRM flags
4 *
5 * Copyright (C) 2001,2002 Sampo Saaristo
6 * Tampere University of Technology
7 * Institute of Communications Engineering
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public Licenseas published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 *
14 * This program is distributed in the hope that it will be useful,but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
17 * more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; see the file COPYING; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #include <zebra.h>
25 #include "log.h"
26 #include "linklist.h"
27
28 #include "isisd/isis_constants.h"
29 #include "isisd/isis_common.h"
30 #include "isisd/isis_flags.h"
31
32 void flags_initialize(struct flags *flags)
33 {
34 flags->maxindex = 0;
35 flags->free_idcs = NULL;
36 }
37
38 long int flags_get_index(struct flags *flags)
39 {
40 struct listnode *node;
41 long int index;
42
43 if (flags->free_idcs == NULL || flags->free_idcs->count == 0) {
44 index = flags->maxindex++;
45 } else {
46 node = listhead(flags->free_idcs);
47 index = (long int)listgetdata(node);
48 listnode_delete(flags->free_idcs, (void *)index);
49 index--;
50 }
51
52 return index;
53 }
54
55 void flags_free_index(struct flags *flags, long int index)
56 {
57 if (index + 1 == flags->maxindex) {
58 flags->maxindex--;
59 return;
60 }
61
62 if (flags->free_idcs == NULL) {
63 flags->free_idcs = list_new();
64 }
65
66 listnode_add(flags->free_idcs, (void *)(index + 1));
67
68 return;
69 }
70
71 int flags_any_set(uint32_t *flags)
72 {
73 uint32_t zero[ISIS_MAX_CIRCUITS];
74 memset(zero, 0x00, ISIS_MAX_CIRCUITS * 4);
75
76 return bcmp(flags, zero, ISIS_MAX_CIRCUITS * 4);
77 }