1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/* $OpenBSD: name2id.c,v 1.9 2009/06/04 04:46:42 claudio Exp $ */
/*
* Copyright (c) 2004, 2005 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <net/route.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "bgpd.h"
#define IDVAL_MAX 50000
struct n2id_label {
TAILQ_ENTRY(n2id_label) entry;
char *name;
u_int16_t id;
int ref;
};
TAILQ_HEAD(n2id_labels, n2id_label);
u_int16_t _name2id(struct n2id_labels *, const char *);
const char *_id2name(struct n2id_labels *, u_int16_t);
void _unref(struct n2id_labels *, u_int16_t);
void _ref(struct n2id_labels *, u_int16_t);
struct n2id_labels rt_labels = TAILQ_HEAD_INITIALIZER(rt_labels);
struct n2id_labels pftable_labels = TAILQ_HEAD_INITIALIZER(pftable_labels);
u_int16_t
rtlabel_name2id(const char *name)
{
return (_name2id(&rt_labels, name));
}
const char *
rtlabel_id2name(u_int16_t id)
{
return (_id2name(&rt_labels, id));
}
void
rtlabel_unref(u_int16_t id)
{
_unref(&rt_labels, id);
}
void
rtlabel_ref(u_int16_t id)
{
_ref(&rt_labels, id);
}
u_int16_t
pftable_name2id(const char *name)
{
return (_name2id(&pftable_labels, name));
}
const char *
pftable_id2name(u_int16_t id)
{
return (_id2name(&pftable_labels, id));
}
void
pftable_unref(u_int16_t id)
{
_unref(&pftable_labels, id);
}
void
pftable_ref(u_int16_t id)
{
_ref(&pftable_labels, id);
}
u_int16_t
_name2id(struct n2id_labels *head, const char *name)
{
struct n2id_label *label, *p = NULL;
u_int16_t new_id = 1;
if (!name[0]) {
errno = EINVAL;
return (0);
}
TAILQ_FOREACH(label, head, entry)
if (strcmp(name, label->name) == 0) {
label->ref++;
return (label->id);
}
/*
* to avoid fragmentation, we do a linear search from the beginning
* and take the first free slot we find. if there is none or the list
* is empty, append a new entry at the end.
*/
if (!TAILQ_EMPTY(head))
for (p = TAILQ_FIRST(head); p != NULL &&
p->id == new_id; p = TAILQ_NEXT(p, entry))
new_id = p->id + 1;
if (new_id > IDVAL_MAX) {
errno = ERANGE;
return (0);
}
if ((label = calloc(1, sizeof(struct n2id_label))) == NULL)
return (0);
if ((label->name = strdup(name)) == NULL) {
free(label);
return (0);
}
label->id = new_id;
label->ref++;
if (p != NULL) /* insert new entry before p */
TAILQ_INSERT_BEFORE(p, label, entry);
else /* either list empty or no free slot in between */
TAILQ_INSERT_TAIL(head, label, entry);
return (label->id);
}
const char *
_id2name(struct n2id_labels *head, u_int16_t id)
{
struct n2id_label *label;
if (id == 0)
return ("");
TAILQ_FOREACH(label, head, entry)
if (label->id == id)
return (label->name);
return ("");
}
void
_unref(struct n2id_labels *head, u_int16_t id)
{
struct n2id_label *p, *next;
if (id == 0)
return;
for (p = TAILQ_FIRST(head); p != NULL; p = next) {
next = TAILQ_NEXT(p, entry);
if (id == p->id) {
if (--p->ref == 0) {
TAILQ_REMOVE(head, p, entry);
free(p->name);
free(p);
}
break;
}
}
}
void
_ref(struct n2id_labels *head, u_int16_t id)
{
struct n2id_label *label;
if (id == 0)
return;
TAILQ_FOREACH(label, head, entry)
if (label->id == id) {
++label->ref;
break;
}
}
|
