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Merge pull request #1927 from pguibert6WIND/issue_1926
[mirror_frr.git] / lib / prefix.c
1 /*
2 * Prefix related functions.
3 * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
4 *
5 * This file is part of GNU Zebra.
6 *
7 * GNU Zebra is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2, or (at your option) any
10 * later version.
11 *
12 * GNU Zebra is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; see the file COPYING; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include <zebra.h>
23
24 #include "prefix.h"
25 #include "vty.h"
26 #include "sockunion.h"
27 #include "memory.h"
28 #include "log.h"
29 #include "jhash.h"
30
31 DEFINE_MTYPE_STATIC(LIB, PREFIX, "Prefix")
32
33 /* Maskbit. */
34 static const uint8_t maskbit[] = {0x00, 0x80, 0xc0, 0xe0, 0xf0,
35 0xf8, 0xfc, 0xfe, 0xff};
36
37 static const struct in6_addr maskbytes6[] = {
38 /* /0 */ {{{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
39 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}},
40 /* /1 */
41 {{{0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
42 0x00, 0x00, 0x00, 0x00, 0x00}}},
43 /* /2 */
44 {{{0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
45 0x00, 0x00, 0x00, 0x00, 0x00}}},
46 /* /3 */
47 {{{0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
48 0x00, 0x00, 0x00, 0x00, 0x00}}},
49 /* /4 */
50 {{{0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
51 0x00, 0x00, 0x00, 0x00, 0x00}}},
52 /* /5 */
53 {{{0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
54 0x00, 0x00, 0x00, 0x00, 0x00}}},
55 /* /6 */
56 {{{0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
57 0x00, 0x00, 0x00, 0x00, 0x00}}},
58 /* /7 */
59 {{{0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
60 0x00, 0x00, 0x00, 0x00, 0x00}}},
61 /* /8 */
62 {{{0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
63 0x00, 0x00, 0x00, 0x00, 0x00}}},
64 /* /9 */
65 {{{0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
66 0x00, 0x00, 0x00, 0x00, 0x00}}},
67 /* /10 */
68 {{{0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
69 0x00, 0x00, 0x00, 0x00, 0x00}}},
70 /* /11 */
71 {{{0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
72 0x00, 0x00, 0x00, 0x00, 0x00}}},
73 /* /12 */
74 {{{0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
75 0x00, 0x00, 0x00, 0x00, 0x00}}},
76 /* /13 */
77 {{{0xff, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
78 0x00, 0x00, 0x00, 0x00, 0x00}}},
79 /* /14 */
80 {{{0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
81 0x00, 0x00, 0x00, 0x00, 0x00}}},
82 /* /15 */
83 {{{0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
84 0x00, 0x00, 0x00, 0x00, 0x00}}},
85 /* /16 */
86 {{{0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
87 0x00, 0x00, 0x00, 0x00, 0x00}}},
88 /* /17 */
89 {{{0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
90 0x00, 0x00, 0x00, 0x00, 0x00}}},
91 /* /18 */
92 {{{0xff, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
93 0x00, 0x00, 0x00, 0x00, 0x00}}},
94 /* /19 */
95 {{{0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
96 0x00, 0x00, 0x00, 0x00, 0x00}}},
97 /* /20 */
98 {{{0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
99 0x00, 0x00, 0x00, 0x00, 0x00}}},
100 /* /21 */
101 {{{0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
102 0x00, 0x00, 0x00, 0x00, 0x00}}},
103 /* /22 */
104 {{{0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
105 0x00, 0x00, 0x00, 0x00, 0x00}}},
106 /* /23 */
107 {{{0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
108 0x00, 0x00, 0x00, 0x00, 0x00}}},
109 /* /24 */
110 {{{0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
111 0x00, 0x00, 0x00, 0x00, 0x00}}},
112 /* /25 */
113 {{{0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
114 0x00, 0x00, 0x00, 0x00, 0x00}}},
115 /* /26 */
116 {{{0xff, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
117 0x00, 0x00, 0x00, 0x00, 0x00}}},
118 /* /27 */
119 {{{0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
120 0x00, 0x00, 0x00, 0x00, 0x00}}},
121 /* /28 */
122 {{{0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
123 0x00, 0x00, 0x00, 0x00, 0x00}}},
124 /* /29 */
125 {{{0xff, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
126 0x00, 0x00, 0x00, 0x00, 0x00}}},
127 /* /30 */
128 {{{0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
129 0x00, 0x00, 0x00, 0x00, 0x00}}},
130 /* /31 */
131 {{{0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
132 0x00, 0x00, 0x00, 0x00, 0x00}}},
133 /* /32 */
134 {{{0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
135 0x00, 0x00, 0x00, 0x00, 0x00}}},
136 /* /33 */
137 {{{0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
138 0x00, 0x00, 0x00, 0x00, 0x00}}},
139 /* /34 */
140 {{{0xff, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
141 0x00, 0x00, 0x00, 0x00, 0x00}}},
142 /* /35 */
143 {{{0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
144 0x00, 0x00, 0x00, 0x00, 0x00}}},
145 /* /36 */
146 {{{0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
147 0x00, 0x00, 0x00, 0x00, 0x00}}},
148 /* /37 */
149 {{{0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
150 0x00, 0x00, 0x00, 0x00, 0x00}}},
151 /* /38 */
152 {{{0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
153 0x00, 0x00, 0x00, 0x00, 0x00}}},
154 /* /39 */
155 {{{0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
156 0x00, 0x00, 0x00, 0x00, 0x00}}},
157 /* /40 */
158 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
159 0x00, 0x00, 0x00, 0x00, 0x00}}},
160 /* /41 */
161 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
162 0x00, 0x00, 0x00, 0x00, 0x00}}},
163 /* /42 */
164 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00,
165 0x00, 0x00, 0x00, 0x00, 0x00}}},
166 /* /43 */
167 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00,
168 0x00, 0x00, 0x00, 0x00, 0x00}}},
169 /* /44 */
170 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00,
171 0x00, 0x00, 0x00, 0x00, 0x00}}},
172 /* /45 */
173 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00,
174 0x00, 0x00, 0x00, 0x00, 0x00}}},
175 /* /46 */
176 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00,
177 0x00, 0x00, 0x00, 0x00, 0x00}}},
178 /* /47 */
179 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00,
180 0x00, 0x00, 0x00, 0x00, 0x00}}},
181 /* /48 */
182 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
183 0x00, 0x00, 0x00, 0x00, 0x00}}},
184 /* /49 */
185 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00,
186 0x00, 0x00, 0x00, 0x00, 0x00}}},
187 /* /50 */
188 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00,
189 0x00, 0x00, 0x00, 0x00, 0x00}}},
190 /* /51 */
191 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00,
192 0x00, 0x00, 0x00, 0x00, 0x00}}},
193 /* /52 */
194 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00,
195 0x00, 0x00, 0x00, 0x00, 0x00}}},
196 /* /53 */
197 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x00,
198 0x00, 0x00, 0x00, 0x00, 0x00}}},
199 /* /54 */
200 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00,
201 0x00, 0x00, 0x00, 0x00, 0x00}}},
202 /* /55 */
203 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00,
204 0x00, 0x00, 0x00, 0x00, 0x00}}},
205 /* /56 */
206 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00,
207 0x00, 0x00, 0x00, 0x00, 0x00}}},
208 /* /57 */
209 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00,
210 0x00, 0x00, 0x00, 0x00, 0x00}}},
211 /* /58 */
212 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x00,
213 0x00, 0x00, 0x00, 0x00, 0x00}}},
214 /* /59 */
215 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00,
216 0x00, 0x00, 0x00, 0x00, 0x00}}},
217 /* /60 */
218 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00,
219 0x00, 0x00, 0x00, 0x00, 0x00}}},
220 /* /61 */
221 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00,
222 0x00, 0x00, 0x00, 0x00, 0x00}}},
223 /* /62 */
224 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00,
225 0x00, 0x00, 0x00, 0x00, 0x00}}},
226 /* /63 */
227 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00,
228 0x00, 0x00, 0x00, 0x00, 0x00}}},
229 /* /64 */
230 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
231 0x00, 0x00, 0x00, 0x00, 0x00}}},
232 /* /65 */
233 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x00,
234 0x00, 0x00, 0x00, 0x00, 0x00}}},
235 /* /66 */
236 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x00,
237 0x00, 0x00, 0x00, 0x00, 0x00}}},
238 /* /67 */
239 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00,
240 0x00, 0x00, 0x00, 0x00, 0x00}}},
241 /* /68 */
242 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00,
243 0x00, 0x00, 0x00, 0x00, 0x00}}},
244 /* /69 */
245 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x00,
246 0x00, 0x00, 0x00, 0x00, 0x00}}},
247 /* /70 */
248 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00,
249 0x00, 0x00, 0x00, 0x00, 0x00}}},
250 /* /71 */
251 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00,
252 0x00, 0x00, 0x00, 0x00, 0x00}}},
253 /* /72 */
254 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00,
255 0x00, 0x00, 0x00, 0x00, 0x00}}},
256 /* /73 */
257 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x00,
258 0x00, 0x00, 0x00, 0x00, 0x00}}},
259 /* /74 */
260 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00,
261 0x00, 0x00, 0x00, 0x00, 0x00}}},
262 /* /75 */
263 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00,
264 0x00, 0x00, 0x00, 0x00, 0x00}}},
265 /* /76 */
266 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00,
267 0x00, 0x00, 0x00, 0x00, 0x00}}},
268 /* /77 */
269 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00,
270 0x00, 0x00, 0x00, 0x00, 0x00}}},
271 /* /78 */
272 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00,
273 0x00, 0x00, 0x00, 0x00, 0x00}}},
274 /* /79 */
275 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00,
276 0x00, 0x00, 0x00, 0x00, 0x00}}},
277 /* /80 */
278 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
279 0x00, 0x00, 0x00, 0x00, 0x00}}},
280 /* /81 */
281 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80,
282 0x00, 0x00, 0x00, 0x00, 0x00}}},
283 /* /82 */
284 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0,
285 0x00, 0x00, 0x00, 0x00, 0x00}}},
286 /* /83 */
287 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0,
288 0x00, 0x00, 0x00, 0x00, 0x00}}},
289 /* /84 */
290 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0,
291 0x00, 0x00, 0x00, 0x00, 0x00}}},
292 /* /85 */
293 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8,
294 0x00, 0x00, 0x00, 0x00, 0x00}}},
295 /* /86 */
296 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc,
297 0x00, 0x00, 0x00, 0x00, 0x00}}},
298 /* /87 */
299 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe,
300 0x00, 0x00, 0x00, 0x00, 0x00}}},
301 /* /88 */
302 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
303 0x00, 0x00, 0x00, 0x00, 0x00}}},
304 /* /89 */
305 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
306 0x80, 0x00, 0x00, 0x00, 0x00}}},
307 /* /90 */
308 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
309 0xc0, 0x00, 0x00, 0x00, 0x00}}},
310 /* /91 */
311 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
312 0xe0, 0x00, 0x00, 0x00, 0x00}}},
313 /* /92 */
314 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
315 0xf0, 0x00, 0x00, 0x00, 0x00}}},
316 /* /93 */
317 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
318 0xf8, 0x00, 0x00, 0x00, 0x00}}},
319 /* /94 */
320 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
321 0xfc, 0x00, 0x00, 0x00, 0x00}}},
322 /* /95 */
323 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
324 0xfe, 0x00, 0x00, 0x00, 0x00}}},
325 /* /96 */
326 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
327 0xff, 0x00, 0x00, 0x00, 0x00}}},
328 /* /97 */
329 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
330 0xff, 0x80, 0x00, 0x00, 0x00}}},
331 /* /98 */
332 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
333 0xff, 0xc0, 0x00, 0x00, 0x00}}},
334 /* /99 */
335 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
336 0xff, 0xe0, 0x00, 0x00, 0x00}}},
337 /* /100 */
338 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
339 0xff, 0xf0, 0x00, 0x00, 0x00}}},
340 /* /101 */
341 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
342 0xff, 0xf8, 0x00, 0x00, 0x00}}},
343 /* /102 */
344 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
345 0xff, 0xfc, 0x00, 0x00, 0x00}}},
346 /* /103 */
347 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
348 0xff, 0xfe, 0x00, 0x00, 0x00}}},
349 /* /104 */
350 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
351 0xff, 0xff, 0x00, 0x00, 0x00}}},
352 /* /105 */
353 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
354 0xff, 0xff, 0x80, 0x00, 0x00}}},
355 /* /106 */
356 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
357 0xff, 0xff, 0xc0, 0x00, 0x00}}},
358 /* /107 */
359 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
360 0xff, 0xff, 0xe0, 0x00, 0x00}}},
361 /* /108 */
362 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
363 0xff, 0xff, 0xf0, 0x00, 0x00}}},
364 /* /109 */
365 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
366 0xff, 0xff, 0xf8, 0x00, 0x00}}},
367 /* /110 */
368 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
369 0xff, 0xff, 0xfc, 0x00, 0x00}}},
370 /* /111 */
371 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
372 0xff, 0xff, 0xfe, 0x00, 0x00}}},
373 /* /112 */
374 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
375 0xff, 0xff, 0xff, 0x00, 0x00}}},
376 /* /113 */
377 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
378 0xff, 0xff, 0xff, 0x80, 0x00}}},
379 /* /114 */
380 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
381 0xff, 0xff, 0xff, 0xc0, 0x00}}},
382 /* /115 */
383 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
384 0xff, 0xff, 0xff, 0xe0, 0x00}}},
385 /* /116 */
386 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
387 0xff, 0xff, 0xff, 0xf0, 0x00}}},
388 /* /117 */
389 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
390 0xff, 0xff, 0xff, 0xf8, 0x00}}},
391 /* /118 */
392 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
393 0xff, 0xff, 0xff, 0xfc, 0x00}}},
394 /* /119 */
395 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
396 0xff, 0xff, 0xff, 0xfe, 0x00}}},
397 /* /120 */
398 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
399 0xff, 0xff, 0xff, 0xff, 0x00}}},
400 /* /121 */
401 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
402 0xff, 0xff, 0xff, 0xff, 0x80}}},
403 /* /122 */
404 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
405 0xff, 0xff, 0xff, 0xff, 0xc0}}},
406 /* /123 */
407 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
408 0xff, 0xff, 0xff, 0xff, 0xe0}}},
409 /* /124 */
410 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
411 0xff, 0xff, 0xff, 0xff, 0xf0}}},
412 /* /125 */
413 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
414 0xff, 0xff, 0xff, 0xff, 0xf8}}},
415 /* /126 */
416 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
417 0xff, 0xff, 0xff, 0xff, 0xfc}}},
418 /* /127 */
419 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
420 0xff, 0xff, 0xff, 0xff, 0xfe}}},
421 /* /128 */
422 {{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
423 0xff, 0xff, 0xff, 0xff, 0xff}}}};
424
425 /* Number of bits in prefix type. */
426 #ifndef PNBBY
427 #define PNBBY 8
428 #endif /* PNBBY */
429
430 #define MASKBIT(offset) ((0xff << (PNBBY - (offset))) & 0xff)
431
432 int is_zero_mac(struct ethaddr *mac)
433 {
434 int i = 0;
435
436 for (i = 0; i < ETH_ALEN; i++) {
437 if (mac->octet[i])
438 return 0;
439 }
440
441 return 1;
442 }
443
444 unsigned int prefix_bit(const uint8_t *prefix, const uint8_t prefixlen)
445 {
446 unsigned int offset = prefixlen / 8;
447 unsigned int shift = 7 - (prefixlen % 8);
448
449 return (prefix[offset] >> shift) & 1;
450 }
451
452 unsigned int prefix6_bit(const struct in6_addr *prefix, const uint8_t prefixlen)
453 {
454 return prefix_bit((const uint8_t *)&prefix->s6_addr, prefixlen);
455 }
456
457 int str2family(const char *string)
458 {
459 if (!strcmp("ipv4", string))
460 return AF_INET;
461 else if (!strcmp("ipv6", string))
462 return AF_INET6;
463 else if (!strcmp("ethernet", string))
464 return AF_ETHERNET;
465 else if (!strcmp("evpn", string))
466 return AF_EVPN;
467 return -1;
468 }
469
470 /* Address Famiy Identifier to Address Family converter. */
471 int afi2family(afi_t afi)
472 {
473 if (afi == AFI_IP)
474 return AF_INET;
475 else if (afi == AFI_IP6)
476 return AF_INET6;
477 else if (afi == AFI_L2VPN)
478 return AF_ETHERNET;
479 /* NOTE: EVPN code should NOT use this interface. */
480 return 0;
481 }
482
483 afi_t family2afi(int family)
484 {
485 if (family == AF_INET)
486 return AFI_IP;
487 else if (family == AF_INET6)
488 return AFI_IP6;
489 else if (family == AF_ETHERNET || family == AF_EVPN)
490 return AFI_L2VPN;
491 return 0;
492 }
493
494 const char *afi2str(afi_t afi)
495 {
496 switch (afi) {
497 case AFI_IP:
498 return "IPv4";
499 case AFI_IP6:
500 return "IPv6";
501 case AFI_L2VPN:
502 return "l2vpn";
503 case AFI_MAX:
504 return "bad-value";
505 default:
506 break;
507 }
508 return NULL;
509 }
510
511 const char *safi2str(safi_t safi)
512 {
513 switch (safi) {
514 case SAFI_UNICAST:
515 return "unicast";
516 case SAFI_MULTICAST:
517 return "multicast";
518 case SAFI_MPLS_VPN:
519 return "vpn";
520 case SAFI_ENCAP:
521 return "encap";
522 case SAFI_EVPN:
523 return "evpn";
524 case SAFI_LABELED_UNICAST:
525 return "labeled-unicast";
526 case SAFI_FLOWSPEC:
527 return "flowspec";
528 default:
529 return "unknown";
530 }
531 }
532
533 /* If n includes p prefix then return 1 else return 0. */
534 int prefix_match(const struct prefix *n, const struct prefix *p)
535 {
536 int offset;
537 int shift;
538 const uint8_t *np, *pp;
539
540 /* If n's prefix is longer than p's one return 0. */
541 if (n->prefixlen > p->prefixlen)
542 return 0;
543
544 if (n->family == AF_FLOWSPEC) {
545 /* prefixlen is unused. look at fs prefix len */
546 if (n->u.prefix_flowspec.prefixlen >
547 p->u.prefix_flowspec.prefixlen)
548 return 0;
549
550 /* Set both prefix's head pointer. */
551 np = (const uint8_t *)&n->u.prefix_flowspec.ptr;
552 pp = (const uint8_t *)&p->u.prefix_flowspec.ptr;
553
554 offset = n->u.prefix_flowspec.prefixlen;
555
556 while (offset--)
557 if (np[offset] != pp[offset])
558 return 0;
559 return 1;
560 }
561
562 /* Set both prefix's head pointer. */
563 np = (const uint8_t *)&n->u.prefix;
564 pp = (const uint8_t *)&p->u.prefix;
565
566 offset = n->prefixlen / PNBBY;
567 shift = n->prefixlen % PNBBY;
568
569 if (shift)
570 if (maskbit[shift] & (np[offset] ^ pp[offset]))
571 return 0;
572
573 while (offset--)
574 if (np[offset] != pp[offset])
575 return 0;
576 return 1;
577 }
578
579 /* If n includes p then return 1 else return 0. Prefix mask is not considered */
580 int prefix_match_network_statement(const struct prefix *n,
581 const struct prefix *p)
582 {
583 int offset;
584 int shift;
585 const uint8_t *np, *pp;
586
587 /* Set both prefix's head pointer. */
588 np = (const uint8_t *)&n->u.prefix;
589 pp = (const uint8_t *)&p->u.prefix;
590
591 offset = n->prefixlen / PNBBY;
592 shift = n->prefixlen % PNBBY;
593
594 if (shift)
595 if (maskbit[shift] & (np[offset] ^ pp[offset]))
596 return 0;
597
598 while (offset--)
599 if (np[offset] != pp[offset])
600 return 0;
601 return 1;
602 }
603
604 void prefix_copy(struct prefix *dest, const struct prefix *src)
605 {
606 dest->family = src->family;
607 dest->prefixlen = src->prefixlen;
608
609 if (src->family == AF_INET)
610 dest->u.prefix4 = src->u.prefix4;
611 else if (src->family == AF_INET6)
612 dest->u.prefix6 = src->u.prefix6;
613 else if (src->family == AF_ETHERNET) {
614 memcpy(&dest->u.prefix_eth, &src->u.prefix_eth,
615 sizeof(struct ethaddr));
616 } else if (src->family == AF_EVPN) {
617 memcpy(&dest->u.prefix_evpn, &src->u.prefix_evpn,
618 sizeof(struct evpn_addr));
619 } else if (src->family == AF_UNSPEC) {
620 dest->u.lp.id = src->u.lp.id;
621 dest->u.lp.adv_router = src->u.lp.adv_router;
622 } else if (src->family == AF_FLOWSPEC) {
623 void *temp;
624 int len;
625
626 len = src->u.prefix_flowspec.prefixlen;
627 dest->u.prefix_flowspec.prefixlen =
628 src->u.prefix_flowspec.prefixlen;
629 dest->family = src->family;
630 temp = XCALLOC(MTYPE_PREFIX_FLOWSPEC, len);
631 dest->u.prefix_flowspec.ptr = (uintptr_t)temp;
632 memcpy((void *)dest->u.prefix_flowspec.ptr,
633 (void *)src->u.prefix_flowspec.ptr, len);
634 } else {
635 zlog_err("prefix_copy(): Unknown address family %d",
636 src->family);
637 assert(0);
638 }
639 }
640
641 /*
642 * Return 1 if the address/netmask contained in the prefix structure
643 * is the same, and else return 0. For this routine, 'same' requires
644 * that not only the prefix length and the network part be the same,
645 * but also the host part. Thus, 10.0.0.1/8 and 10.0.0.2/8 are not
646 * the same. Note that this routine has the same return value sense
647 * as '==' (which is different from prefix_cmp).
648 */
649 int prefix_same(const struct prefix *p1, const struct prefix *p2)
650 {
651 if ((p1 && !p2) || (!p1 && p2))
652 return 0;
653
654 if (!p1 && !p2)
655 return 1;
656
657 if (p1->family == p2->family && p1->prefixlen == p2->prefixlen) {
658 if (p1->family == AF_INET)
659 if (IPV4_ADDR_SAME(&p1->u.prefix4, &p2->u.prefix4))
660 return 1;
661 if (p1->family == AF_INET6)
662 if (IPV6_ADDR_SAME(&p1->u.prefix6.s6_addr,
663 &p2->u.prefix6.s6_addr))
664 return 1;
665 if (p1->family == AF_ETHERNET)
666 if (!memcmp(&p1->u.prefix_eth, &p2->u.prefix_eth,
667 sizeof(struct ethaddr)))
668 return 1;
669 if (p1->family == AF_EVPN)
670 if (!memcmp(&p1->u.prefix_evpn, &p2->u.prefix_evpn,
671 sizeof(struct evpn_addr)))
672 return 1;
673 if (p1->family == AF_FLOWSPEC) {
674 if (p1->u.prefix_flowspec.prefixlen !=
675 p2->u.prefix_flowspec.prefixlen)
676 return 0;
677 if (!memcmp(&p1->u.prefix_flowspec.ptr,
678 &p2->u.prefix_flowspec.ptr,
679 p2->u.prefix_flowspec.prefixlen))
680 return 1;
681 }
682 }
683 return 0;
684 }
685
686 /*
687 * Return 0 if the network prefixes represented by the struct prefix
688 * arguments are the same prefix, and 1 otherwise. Network prefixes
689 * are considered the same if the prefix lengths are equal and the
690 * network parts are the same. Host bits (which are considered masked
691 * by the prefix length) are not significant. Thus, 10.0.0.1/8 and
692 * 10.0.0.2/8 are considered equivalent by this routine. Note that
693 * this routine has the same return sense as strcmp (which is different
694 * from prefix_same).
695 */
696 int prefix_cmp(const struct prefix *p1, const struct prefix *p2)
697 {
698 int offset;
699 int shift;
700
701 /* Set both prefix's head pointer. */
702 const uint8_t *pp1;
703 const uint8_t *pp2;
704
705 if (p1->family != p2->family)
706 return 1;
707 if (p1->family == AF_FLOWSPEC) {
708 pp1 = (const uint8_t *)p1->u.prefix_flowspec.ptr;
709 pp2 = (const uint8_t *)p2->u.prefix_flowspec.ptr;
710
711 if (p1->u.prefix_flowspec.prefixlen !=
712 p2->u.prefix_flowspec.prefixlen)
713 return 1;
714
715 offset = p1->u.prefix_flowspec.prefixlen;
716 while (offset--)
717 if (pp1[offset] != pp2[offset])
718 return 1;
719 return 0;
720 }
721 pp1 = (const uint8_t *)&p1->u.prefix;
722 pp2 = (const uint8_t *)&p2->u.prefix;
723
724 if (p1->prefixlen != p2->prefixlen)
725 return 1;
726 offset = p1->prefixlen / PNBBY;
727 shift = p1->prefixlen % PNBBY;
728
729 if (shift)
730 if (maskbit[shift] & (pp1[offset] ^ pp2[offset]))
731 return 1;
732
733 while (offset--)
734 if (pp1[offset] != pp2[offset])
735 return 1;
736
737 return 0;
738 }
739
740 /*
741 * Count the number of common bits in 2 prefixes. The prefix length is
742 * ignored for this function; the whole prefix is compared. If the prefix
743 * address families don't match, return -1; otherwise the return value is
744 * in range 0 ... maximum prefix length for the address family.
745 */
746 int prefix_common_bits(const struct prefix *p1, const struct prefix *p2)
747 {
748 int pos, bit;
749 int length = 0;
750 uint8_t xor ;
751
752 /* Set both prefix's head pointer. */
753 const uint8_t *pp1 = (const uint8_t *)&p1->u.prefix;
754 const uint8_t *pp2 = (const uint8_t *)&p2->u.prefix;
755
756 if (p1->family == AF_INET)
757 length = IPV4_MAX_BYTELEN;
758 if (p1->family == AF_INET6)
759 length = IPV6_MAX_BYTELEN;
760 if (p1->family == AF_ETHERNET)
761 length = ETH_ALEN;
762 if (p1->family == AF_EVPN)
763 length = 8 * sizeof(struct evpn_addr);
764
765 if (p1->family != p2->family || !length)
766 return -1;
767
768 for (pos = 0; pos < length; pos++)
769 if (pp1[pos] != pp2[pos])
770 break;
771 if (pos == length)
772 return pos * 8;
773
774 xor = pp1[pos] ^ pp2[pos];
775 for (bit = 0; bit < 8; bit++)
776 if (xor&(1 << (7 - bit)))
777 break;
778
779 return pos * 8 + bit;
780 }
781
782 /* Return prefix family type string. */
783 const char *prefix_family_str(const struct prefix *p)
784 {
785 if (p->family == AF_INET)
786 return "inet";
787 if (p->family == AF_INET6)
788 return "inet6";
789 if (p->family == AF_ETHERNET)
790 return "ether";
791 if (p->family == AF_EVPN)
792 return "evpn";
793 return "unspec";
794 }
795
796 /* Allocate new prefix_ipv4 structure. */
797 struct prefix_ipv4 *prefix_ipv4_new()
798 {
799 struct prefix_ipv4 *p;
800
801 /* Call prefix_new to allocate a full-size struct prefix to avoid
802 problems
803 where the struct prefix_ipv4 is cast to struct prefix and unallocated
804 bytes were being referenced (e.g. in structure assignments). */
805 p = (struct prefix_ipv4 *)prefix_new();
806 p->family = AF_INET;
807 return p;
808 }
809
810 /* Free prefix_ipv4 structure. */
811 void prefix_ipv4_free(struct prefix_ipv4 *p)
812 {
813 prefix_free((struct prefix *)p);
814 }
815
816 /* When string format is invalid return 0. */
817 int str2prefix_ipv4(const char *str, struct prefix_ipv4 *p)
818 {
819 int ret;
820 int plen;
821 char *pnt;
822 char *cp;
823
824 /* Find slash inside string. */
825 pnt = strchr(str, '/');
826
827 /* String doesn't contail slash. */
828 if (pnt == NULL) {
829 /* Convert string to prefix. */
830 ret = inet_aton(str, &p->prefix);
831 if (ret == 0)
832 return 0;
833
834 /* If address doesn't contain slash we assume it host address.
835 */
836 p->family = AF_INET;
837 p->prefixlen = IPV4_MAX_BITLEN;
838
839 return ret;
840 } else {
841 cp = XMALLOC(MTYPE_TMP, (pnt - str) + 1);
842 strncpy(cp, str, pnt - str);
843 *(cp + (pnt - str)) = '\0';
844 ret = inet_aton(cp, &p->prefix);
845 XFREE(MTYPE_TMP, cp);
846
847 /* Get prefix length. */
848 plen = (uint8_t)atoi(++pnt);
849 if (plen > IPV4_MAX_PREFIXLEN)
850 return 0;
851
852 p->family = AF_INET;
853 p->prefixlen = plen;
854 }
855
856 return ret;
857 }
858
859 /* When string format is invalid return 0. */
860 int str2prefix_eth(const char *str, struct prefix_eth *p)
861 {
862 int ret = 0;
863 int plen = 48;
864 char *pnt;
865 char *cp = NULL;
866 const char *str_addr = str;
867 unsigned int a[6];
868 int i;
869 bool slash = false;
870
871 if (!strcmp(str, "any")) {
872 memset(p, 0, sizeof(*p));
873 p->family = AF_ETHERNET;
874 return 1;
875 }
876
877 /* Find slash inside string. */
878 pnt = strchr(str, '/');
879
880 if (pnt) {
881 /* Get prefix length. */
882 plen = (uint8_t)atoi(++pnt);
883 if (plen > 48) {
884 ret = 0;
885 goto done;
886 }
887
888 cp = XMALLOC(MTYPE_TMP, (pnt - str) + 1);
889 strncpy(cp, str, pnt - str);
890 *(cp + (pnt - str)) = '\0';
891
892 str_addr = cp;
893 slash = true;
894 }
895
896 /* Convert string to prefix. */
897 if (sscanf(str_addr, "%2x:%2x:%2x:%2x:%2x:%2x", a + 0, a + 1, a + 2,
898 a + 3, a + 4, a + 5)
899 != 6) {
900 ret = 0;
901 goto done;
902 }
903 for (i = 0; i < 6; ++i) {
904 p->eth_addr.octet[i] = a[i] & 0xff;
905 }
906 p->prefixlen = plen;
907 p->family = AF_ETHERNET;
908
909 /*
910 * special case to allow old configurations to work
911 * Since all zero's is implicitly meant to allow
912 * a comparison to zero, let's assume
913 */
914 if (!slash && is_zero_mac(&(p->eth_addr)))
915 p->prefixlen = 0;
916
917 ret = 1;
918
919 done:
920 if (cp)
921 XFREE(MTYPE_TMP, cp);
922
923 return ret;
924 }
925
926 /* Convert masklen into IP address's netmask (network byte order). */
927 void masklen2ip(const int masklen, struct in_addr *netmask)
928 {
929 assert(masklen >= 0 && masklen <= IPV4_MAX_BITLEN);
930
931 /* left shift is only defined for less than the size of the type.
932 * we unconditionally use long long in case the target platform
933 * has defined behaviour for << 32 (or has a 64-bit left shift) */
934
935 if (sizeof(unsigned long long) > 4)
936 netmask->s_addr = htonl(0xffffffffULL << (32 - masklen));
937 else
938 netmask->s_addr =
939 htonl(masklen ? 0xffffffffU << (32 - masklen) : 0);
940 }
941
942 /* Convert IP address's netmask into integer. We assume netmask is
943 sequential one. Argument netmask should be network byte order. */
944 uint8_t ip_masklen(struct in_addr netmask)
945 {
946 uint32_t tmp = ~ntohl(netmask.s_addr);
947 if (tmp)
948 /* clz: count leading zeroes. sadly, the behaviour of this
949 * builtin
950 * is undefined for a 0 argument, even though most CPUs give 32
951 */
952 return __builtin_clz(tmp);
953 else
954 return 32;
955 }
956
957 /* Apply mask to IPv4 prefix (network byte order). */
958 void apply_mask_ipv4(struct prefix_ipv4 *p)
959 {
960 struct in_addr mask;
961 masklen2ip(p->prefixlen, &mask);
962 p->prefix.s_addr &= mask.s_addr;
963 }
964
965 /* If prefix is 0.0.0.0/0 then return 1 else return 0. */
966 int prefix_ipv4_any(const struct prefix_ipv4 *p)
967 {
968 return (p->prefix.s_addr == 0 && p->prefixlen == 0);
969 }
970
971 /* Allocate a new ip version 6 route */
972 struct prefix_ipv6 *prefix_ipv6_new(void)
973 {
974 struct prefix_ipv6 *p;
975
976 /* Allocate a full-size struct prefix to avoid problems with structure
977 size mismatches. */
978 p = (struct prefix_ipv6 *)prefix_new();
979 p->family = AF_INET6;
980 return p;
981 }
982
983 /* Free prefix for IPv6. */
984 void prefix_ipv6_free(struct prefix_ipv6 *p)
985 {
986 prefix_free((struct prefix *)p);
987 }
988
989 /* If given string is valid return pin6 else return NULL */
990 int str2prefix_ipv6(const char *str, struct prefix_ipv6 *p)
991 {
992 char *pnt;
993 char *cp;
994 int ret;
995
996 pnt = strchr(str, '/');
997
998 /* If string doesn't contain `/' treat it as host route. */
999 if (pnt == NULL) {
1000 ret = inet_pton(AF_INET6, str, &p->prefix);
1001 if (ret == 0)
1002 return 0;
1003 p->prefixlen = IPV6_MAX_BITLEN;
1004 } else {
1005 int plen;
1006
1007 cp = XMALLOC(MTYPE_TMP, (pnt - str) + 1);
1008 strncpy(cp, str, pnt - str);
1009 *(cp + (pnt - str)) = '\0';
1010 ret = inet_pton(AF_INET6, cp, &p->prefix);
1011 XFREE(MTYPE_TMP, cp);
1012 if (ret == 0)
1013 return 0;
1014 plen = (uint8_t)atoi(++pnt);
1015 if (plen > IPV6_MAX_BITLEN)
1016 return 0;
1017 p->prefixlen = plen;
1018 }
1019 p->family = AF_INET6;
1020
1021 return ret;
1022 }
1023
1024 /* Convert struct in6_addr netmask into integer.
1025 * FIXME return uint8_t as ip_maskleni() does. */
1026 int ip6_masklen(struct in6_addr netmask)
1027 {
1028 int len = 0;
1029 unsigned char val;
1030 unsigned char *pnt;
1031
1032 pnt = (unsigned char *)&netmask;
1033
1034 while ((*pnt == 0xff) && len < IPV6_MAX_BITLEN) {
1035 len += 8;
1036 pnt++;
1037 }
1038
1039 if (len < IPV6_MAX_BITLEN) {
1040 val = *pnt;
1041 while (val) {
1042 len++;
1043 val <<= 1;
1044 }
1045 }
1046 return len;
1047 }
1048
1049 void masklen2ip6(const int masklen, struct in6_addr *netmask)
1050 {
1051 assert(masklen >= 0 && masklen <= IPV6_MAX_BITLEN);
1052 memcpy(netmask, maskbytes6 + masklen, sizeof(struct in6_addr));
1053 }
1054
1055 void apply_mask_ipv6(struct prefix_ipv6 *p)
1056 {
1057 uint8_t *pnt;
1058 int index;
1059 int offset;
1060
1061 index = p->prefixlen / 8;
1062
1063 if (index < 16) {
1064 pnt = (uint8_t *)&p->prefix;
1065 offset = p->prefixlen % 8;
1066
1067 pnt[index] &= maskbit[offset];
1068 index++;
1069
1070 while (index < 16)
1071 pnt[index++] = 0;
1072 }
1073 }
1074
1075 void apply_mask(struct prefix *p)
1076 {
1077 switch (p->family) {
1078 case AF_INET:
1079 apply_mask_ipv4((struct prefix_ipv4 *)p);
1080 break;
1081 case AF_INET6:
1082 apply_mask_ipv6((struct prefix_ipv6 *)p);
1083 break;
1084 default:
1085 break;
1086 }
1087 return;
1088 }
1089
1090 /* Utility function of convert between struct prefix <=> union sockunion.
1091 * FIXME This function isn't used anywhere. */
1092 struct prefix *sockunion2prefix(const union sockunion *dest,
1093 const union sockunion *mask)
1094 {
1095 if (dest->sa.sa_family == AF_INET) {
1096 struct prefix_ipv4 *p;
1097
1098 p = prefix_ipv4_new();
1099 p->family = AF_INET;
1100 p->prefix = dest->sin.sin_addr;
1101 p->prefixlen = ip_masklen(mask->sin.sin_addr);
1102 return (struct prefix *)p;
1103 }
1104 if (dest->sa.sa_family == AF_INET6) {
1105 struct prefix_ipv6 *p;
1106
1107 p = prefix_ipv6_new();
1108 p->family = AF_INET6;
1109 p->prefixlen = ip6_masklen(mask->sin6.sin6_addr);
1110 memcpy(&p->prefix, &dest->sin6.sin6_addr,
1111 sizeof(struct in6_addr));
1112 return (struct prefix *)p;
1113 }
1114 return NULL;
1115 }
1116
1117 /* Utility function of convert between struct prefix <=> union sockunion. */
1118 struct prefix *sockunion2hostprefix(const union sockunion *su,
1119 struct prefix *prefix)
1120 {
1121 if (su->sa.sa_family == AF_INET) {
1122 struct prefix_ipv4 *p;
1123
1124 p = prefix ? (struct prefix_ipv4 *)prefix : prefix_ipv4_new();
1125 p->family = AF_INET;
1126 p->prefix = su->sin.sin_addr;
1127 p->prefixlen = IPV4_MAX_BITLEN;
1128 return (struct prefix *)p;
1129 }
1130 if (su->sa.sa_family == AF_INET6) {
1131 struct prefix_ipv6 *p;
1132
1133 p = prefix ? (struct prefix_ipv6 *)prefix : prefix_ipv6_new();
1134 p->family = AF_INET6;
1135 p->prefixlen = IPV6_MAX_BITLEN;
1136 memcpy(&p->prefix, &su->sin6.sin6_addr,
1137 sizeof(struct in6_addr));
1138 return (struct prefix *)p;
1139 }
1140 return NULL;
1141 }
1142
1143 void prefix2sockunion(const struct prefix *p, union sockunion *su)
1144 {
1145 memset(su, 0, sizeof(*su));
1146
1147 su->sa.sa_family = p->family;
1148 if (p->family == AF_INET)
1149 su->sin.sin_addr = p->u.prefix4;
1150 if (p->family == AF_INET6)
1151 memcpy(&su->sin6.sin6_addr, &p->u.prefix6,
1152 sizeof(struct in6_addr));
1153 }
1154
1155 int prefix_blen(const struct prefix *p)
1156 {
1157 switch (p->family) {
1158 case AF_INET:
1159 return IPV4_MAX_BYTELEN;
1160 break;
1161 case AF_INET6:
1162 return IPV6_MAX_BYTELEN;
1163 break;
1164 case AF_ETHERNET:
1165 return ETH_ALEN;
1166 break;
1167 }
1168 return 0;
1169 }
1170
1171 /* Generic function for conversion string to struct prefix. */
1172 int str2prefix(const char *str, struct prefix *p)
1173 {
1174 int ret;
1175
1176 /* First we try to convert string to struct prefix_ipv4. */
1177 ret = str2prefix_ipv4(str, (struct prefix_ipv4 *)p);
1178 if (ret)
1179 return ret;
1180
1181 /* Next we try to convert string to struct prefix_ipv6. */
1182 ret = str2prefix_ipv6(str, (struct prefix_ipv6 *)p);
1183 if (ret)
1184 return ret;
1185
1186 /* Next we try to convert string to struct prefix_eth. */
1187 ret = str2prefix_eth(str, (struct prefix_eth *)p);
1188 if (ret)
1189 return ret;
1190
1191 return 0;
1192 }
1193
1194 static const char *prefixevpn2str(const struct prefix *p, char *str, int size)
1195 {
1196 uint8_t family;
1197 char buf[PREFIX2STR_BUFFER];
1198 char buf2[ETHER_ADDR_STRLEN];
1199
1200 if (p->u.prefix_evpn.route_type == 2) {
1201 if (IS_EVPN_PREFIX_IPADDR_NONE((struct prefix_evpn *)p))
1202 snprintf(str, size, "[%d]:[%s]/%d",
1203 p->u.prefix_evpn.route_type,
1204 prefix_mac2str(&p->u.prefix_evpn.mac, buf2,
1205 sizeof(buf2)),
1206 p->prefixlen);
1207 else {
1208 family = IS_EVPN_PREFIX_IPADDR_V4(
1209 (struct prefix_evpn *)p)
1210 ? AF_INET
1211 : AF_INET6;
1212 snprintf(str, size, "[%d]:[%s]:[%s]/%d",
1213 p->u.prefix_evpn.route_type,
1214 prefix_mac2str(&p->u.prefix_evpn.mac, buf2,
1215 sizeof(buf2)),
1216 inet_ntop(family, &p->u.prefix_evpn.ip.ip.addr,
1217 buf, PREFIX2STR_BUFFER),
1218 p->prefixlen);
1219 }
1220 } else if (p->u.prefix_evpn.route_type == 3) {
1221 family = IS_EVPN_PREFIX_IPADDR_V4((struct prefix_evpn *)p)
1222 ? AF_INET
1223 : AF_INET6;
1224 snprintf(str, size, "[%d]:[%s]/%d", p->u.prefix_evpn.route_type,
1225 inet_ntop(family, &p->u.prefix_evpn.ip.ip.addr, buf,
1226 PREFIX2STR_BUFFER),
1227 p->prefixlen);
1228 } else if (p->u.prefix_evpn.route_type == 5) {
1229 family = IS_EVPN_PREFIX_IPADDR_V4((struct prefix_evpn *)p)
1230 ? AF_INET
1231 : AF_INET6;
1232 snprintf(str, size, "[%d]:[%u][%s/%d]/%d",
1233 p->u.prefix_evpn.route_type, p->u.prefix_evpn.eth_tag,
1234 inet_ntop(family, &p->u.prefix_evpn.ip.ip.addr, buf,
1235 PREFIX2STR_BUFFER),
1236 p->u.prefix_evpn.ip_prefix_length, p->prefixlen);
1237 } else {
1238 sprintf(str, "Unsupported EVPN route type %d",
1239 p->u.prefix_evpn.route_type);
1240 }
1241
1242 return str;
1243 }
1244
1245 const char *prefix2str(union prefixconstptr pu, char *str, int size)
1246 {
1247 const struct prefix *p = pu.p;
1248 char buf[PREFIX2STR_BUFFER];
1249
1250 switch (p->family) {
1251 case AF_INET:
1252 case AF_INET6:
1253 snprintf(str, size, "%s/%d", inet_ntop(p->family, &p->u.prefix,
1254 buf, PREFIX2STR_BUFFER),
1255 p->prefixlen);
1256 break;
1257
1258 case AF_ETHERNET:
1259 snprintf(str, size, "%s/%d",
1260 prefix_mac2str(&p->u.prefix_eth, buf, sizeof(buf)),
1261 p->prefixlen);
1262 break;
1263
1264 case AF_EVPN:
1265 prefixevpn2str(p, str, size);
1266 break;
1267
1268 case AF_FLOWSPEC:
1269 sprintf(str, "FS prefix");
1270 break;
1271
1272 default:
1273 sprintf(str, "UNK prefix");
1274 break;
1275 }
1276
1277 return str;
1278 }
1279
1280 struct prefix *prefix_new()
1281 {
1282 struct prefix *p;
1283
1284 p = XCALLOC(MTYPE_PREFIX, sizeof *p);
1285 return p;
1286 }
1287
1288 /* Free prefix structure. */
1289 void prefix_free(struct prefix *p)
1290 {
1291 XFREE(MTYPE_PREFIX, p);
1292 }
1293
1294 /* Utility function. Check the string only contains digit
1295 * character.
1296 * FIXME str.[c|h] would be better place for this function. */
1297 int all_digit(const char *str)
1298 {
1299 for (; *str != '\0'; str++)
1300 if (!isdigit((int)*str))
1301 return 0;
1302 return 1;
1303 }
1304
1305 /* Utility function to convert ipv4 prefixes to Classful prefixes */
1306 void apply_classful_mask_ipv4(struct prefix_ipv4 *p)
1307 {
1308
1309 uint32_t destination;
1310
1311 destination = ntohl(p->prefix.s_addr);
1312
1313 if (p->prefixlen == IPV4_MAX_PREFIXLEN)
1314 ;
1315 /* do nothing for host routes */
1316 else if (IN_CLASSC(destination)) {
1317 p->prefixlen = 24;
1318 apply_mask_ipv4(p);
1319 } else if (IN_CLASSB(destination)) {
1320 p->prefixlen = 16;
1321 apply_mask_ipv4(p);
1322 } else {
1323 p->prefixlen = 8;
1324 apply_mask_ipv4(p);
1325 }
1326 }
1327
1328 in_addr_t ipv4_network_addr(in_addr_t hostaddr, int masklen)
1329 {
1330 struct in_addr mask;
1331
1332 masklen2ip(masklen, &mask);
1333 return hostaddr & mask.s_addr;
1334 }
1335
1336 in_addr_t ipv4_broadcast_addr(in_addr_t hostaddr, int masklen)
1337 {
1338 struct in_addr mask;
1339
1340 masklen2ip(masklen, &mask);
1341 return (masklen != IPV4_MAX_PREFIXLEN - 1) ?
1342 /* normal case */
1343 (hostaddr | ~mask.s_addr)
1344 :
1345 /* special case for /31 */
1346 (hostaddr ^ ~mask.s_addr);
1347 }
1348
1349 /* Utility function to convert ipv4 netmask to prefixes
1350 ex.) "1.1.0.0" "255.255.0.0" => "1.1.0.0/16"
1351 ex.) "1.0.0.0" NULL => "1.0.0.0/8" */
1352 int netmask_str2prefix_str(const char *net_str, const char *mask_str,
1353 char *prefix_str)
1354 {
1355 struct in_addr network;
1356 struct in_addr mask;
1357 uint8_t prefixlen;
1358 uint32_t destination;
1359 int ret;
1360
1361 ret = inet_aton(net_str, &network);
1362 if (!ret)
1363 return 0;
1364
1365 if (mask_str) {
1366 ret = inet_aton(mask_str, &mask);
1367 if (!ret)
1368 return 0;
1369
1370 prefixlen = ip_masklen(mask);
1371 } else {
1372 destination = ntohl(network.s_addr);
1373
1374 if (network.s_addr == 0)
1375 prefixlen = 0;
1376 else if (IN_CLASSC(destination))
1377 prefixlen = 24;
1378 else if (IN_CLASSB(destination))
1379 prefixlen = 16;
1380 else if (IN_CLASSA(destination))
1381 prefixlen = 8;
1382 else
1383 return 0;
1384 }
1385
1386 sprintf(prefix_str, "%s/%d", net_str, prefixlen);
1387
1388 return 1;
1389 }
1390
1391 /* Utility function for making IPv6 address string. */
1392 const char *inet6_ntoa(struct in6_addr addr)
1393 {
1394 static char buf[INET6_ADDRSTRLEN];
1395
1396 inet_ntop(AF_INET6, &addr, buf, INET6_ADDRSTRLEN);
1397 return buf;
1398 }
1399
1400 /* converts to internal representation of mac address
1401 * returns 1 on success, 0 otherwise
1402 * format accepted: AA:BB:CC:DD:EE:FF
1403 * if mac parameter is null, then check only
1404 */
1405 int prefix_str2mac(const char *str, struct ethaddr *mac)
1406 {
1407 unsigned int a[6];
1408 int i;
1409
1410 if (!str)
1411 return 0;
1412
1413 if (sscanf(str, "%2x:%2x:%2x:%2x:%2x:%2x", a + 0, a + 1, a + 2, a + 3,
1414 a + 4, a + 5)
1415 != 6) {
1416 /* error in incoming str length */
1417 return 0;
1418 }
1419 /* valid mac address */
1420 if (!mac)
1421 return 1;
1422 for (i = 0; i < 6; ++i)
1423 mac->octet[i] = a[i] & 0xff;
1424 return 1;
1425 }
1426
1427 char *prefix_mac2str(const struct ethaddr *mac, char *buf, int size)
1428 {
1429 char *ptr;
1430
1431 if (!mac)
1432 return NULL;
1433 if (!buf)
1434 ptr = (char *)XMALLOC(MTYPE_TMP,
1435 ETHER_ADDR_STRLEN * sizeof(char));
1436 else {
1437 assert(size >= ETHER_ADDR_STRLEN);
1438 ptr = buf;
1439 }
1440 snprintf(ptr, (ETHER_ADDR_STRLEN), "%02x:%02x:%02x:%02x:%02x:%02x",
1441 (uint8_t)mac->octet[0], (uint8_t)mac->octet[1],
1442 (uint8_t)mac->octet[2], (uint8_t)mac->octet[3],
1443 (uint8_t)mac->octet[4], (uint8_t)mac->octet[5]);
1444 return ptr;
1445 }
1446
1447 unsigned prefix_hash_key(void *pp)
1448 {
1449 struct prefix copy;
1450
1451 if (((struct prefix *)pp)->family == AF_FLOWSPEC) {
1452 uint32_t len;
1453 void *temp;
1454
1455 /* make sure *all* unused bits are zero,
1456 * particularly including alignment /
1457 * padding and unused prefix bytes.
1458 */
1459 memset(&copy, 0, sizeof(copy));
1460 prefix_copy(&copy, (struct prefix *)pp);
1461 len = jhash((void *)copy.u.prefix_flowspec.ptr,
1462 copy.u.prefix_flowspec.prefixlen,
1463 0x55aa5a5a);
1464 temp = (void *)copy.u.prefix_flowspec.ptr;
1465 XFREE(MTYPE_PREFIX_FLOWSPEC, temp);
1466 copy.u.prefix_flowspec.ptr = (uintptr_t)NULL;
1467 return len;
1468 }
1469 /* make sure *all* unused bits are zero, particularly including
1470 * alignment /
1471 * padding and unused prefix bytes. */
1472 memset(&copy, 0, sizeof(copy));
1473 prefix_copy(&copy, (struct prefix *)pp);
1474 return jhash(&copy,
1475 offsetof(struct prefix, u.prefix) + PSIZE(copy.prefixlen),
1476 0x55aa5a5a);
1477 }
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