blob: 0bf17da40d52e0b60158052c20783ea5f5fe24ba [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Generic address resultion entity
3 *
4 * Authors:
5 * net_random Alan Cox
Steven Rostedt75b31c32006-09-27 22:55:39 -07006 * net_ratelimit Andi Kleen
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +09007 * in{4,6}_pton YOSHIFUJI Hideaki, Copyright (C)2006 USAGI/WIDE Project
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * Created by Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17#include <linux/module.h>
18#include <linux/jiffies.h>
19#include <linux/kernel.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030020#include <linux/inet.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/mm.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030022#include <linux/net.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/string.h>
24#include <linux/types.h>
25#include <linux/random.h>
26#include <linux/percpu.h>
27#include <linux/init.h>
Johannes Berg14ae8562007-08-07 18:02:43 -070028#include <net/sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Matt Mackall5e43db72005-07-27 15:24:42 -070030#include <asm/byteorder.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/system.h>
32#include <asm/uaccess.h>
33
Eric Dumazet6dea6492007-03-08 22:36:37 -080034int net_msg_cost __read_mostly = 5*HZ;
35int net_msg_burst __read_mostly = 10;
36int net_msg_warn __read_mostly = 1;
Stephen Hemmingera2a316f2007-03-08 20:41:08 -080037EXPORT_SYMBOL(net_msg_warn);
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090039/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 * All net warning printk()s should be guarded by this function.
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090041 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070042int net_ratelimit(void)
43{
44 return __printk_ratelimit(net_msg_cost, net_msg_burst);
45}
Linus Torvalds1da177e2005-04-16 15:20:36 -070046EXPORT_SYMBOL(net_ratelimit);
Matt Mackall5e43db72005-07-27 15:24:42 -070047
48/*
49 * Convert an ASCII string to binary IP.
50 * This is outside of net/ipv4/ because various code that uses IP addresses
51 * is otherwise not dependent on the TCP/IP stack.
52 */
53
Alexey Dobriyana2167dc2006-01-06 13:24:54 -080054__be32 in_aton(const char *str)
Matt Mackall5e43db72005-07-27 15:24:42 -070055{
56 unsigned long l;
57 unsigned int val;
58 int i;
59
60 l = 0;
61 for (i = 0; i < 4; i++)
62 {
63 l <<= 8;
64 if (*str != '\0')
65 {
66 val = 0;
Mitch Williams1e2e5652005-11-09 10:34:01 -080067 while (*str != '\0' && *str != '.' && *str != '\n')
Matt Mackall5e43db72005-07-27 15:24:42 -070068 {
69 val *= 10;
70 val += *str - '0';
71 str++;
72 }
73 l |= val;
74 if (*str != '\0')
75 str++;
76 }
77 }
78 return(htonl(l));
79}
80
81EXPORT_SYMBOL(in_aton);
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +090082
83#define IN6PTON_XDIGIT 0x00010000
84#define IN6PTON_DIGIT 0x00020000
85#define IN6PTON_COLON_MASK 0x00700000
86#define IN6PTON_COLON_1 0x00100000 /* single : requested */
87#define IN6PTON_COLON_2 0x00200000 /* second : requested */
88#define IN6PTON_COLON_1_2 0x00400000 /* :: requested */
89#define IN6PTON_DOT 0x00800000 /* . */
90#define IN6PTON_DELIM 0x10000000
91#define IN6PTON_NULL 0x20000000 /* first/tail */
92#define IN6PTON_UNKNOWN 0x40000000
93
Patrick McHardy9a7c9332006-12-02 22:04:04 -080094static inline int digit2bin(char c, int delim)
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +090095{
96 if (c == delim || c == '\0')
97 return IN6PTON_DELIM;
98 if (c == '.')
99 return IN6PTON_DOT;
100 if (c >= '0' && c <= '9')
101 return (IN6PTON_DIGIT | (c - '0'));
102 return IN6PTON_UNKNOWN;
103}
104
Patrick McHardy9a7c9332006-12-02 22:04:04 -0800105static inline int xdigit2bin(char c, int delim)
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900106{
107 if (c == delim || c == '\0')
108 return IN6PTON_DELIM;
109 if (c == ':')
110 return IN6PTON_COLON_MASK;
111 if (c == '.')
112 return IN6PTON_DOT;
113 if (c >= '0' && c <= '9')
114 return (IN6PTON_XDIGIT | IN6PTON_DIGIT| (c - '0'));
115 if (c >= 'a' && c <= 'f')
116 return (IN6PTON_XDIGIT | (c - 'a' + 10));
117 if (c >= 'A' && c <= 'F')
118 return (IN6PTON_XDIGIT | (c - 'A' + 10));
Patrick McHardy9a7c9332006-12-02 22:04:04 -0800119 if (delim == -1)
120 return IN6PTON_DELIM;
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900121 return IN6PTON_UNKNOWN;
122}
123
124int in4_pton(const char *src, int srclen,
125 u8 *dst,
Patrick McHardy9a7c9332006-12-02 22:04:04 -0800126 int delim, const char **end)
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900127{
128 const char *s;
129 u8 *d;
130 u8 dbuf[4];
131 int ret = 0;
132 int i;
133 int w = 0;
134
135 if (srclen < 0)
136 srclen = strlen(src);
137 s = src;
138 d = dbuf;
139 i = 0;
140 while(1) {
141 int c;
142 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
Jerome Borsboom83f03fa2007-05-29 12:59:54 -0700143 if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) {
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900144 goto out;
145 }
Jerome Borsboom83f03fa2007-05-29 12:59:54 -0700146 if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900147 if (w == 0)
148 goto out;
149 *d++ = w & 0xff;
150 w = 0;
151 i++;
Jerome Borsboom83f03fa2007-05-29 12:59:54 -0700152 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900153 if (i != 4)
154 goto out;
155 break;
156 }
157 goto cont;
158 }
159 w = (w * 10) + c;
160 if ((w & 0xffff) > 255) {
161 goto out;
162 }
163cont:
164 if (i >= 4)
165 goto out;
166 s++;
167 srclen--;
168 }
169 ret = 1;
170 memcpy(dst, dbuf, sizeof(dbuf));
171out:
172 if (end)
173 *end = s;
174 return ret;
175}
176
177EXPORT_SYMBOL(in4_pton);
178
179int in6_pton(const char *src, int srclen,
180 u8 *dst,
Patrick McHardy9a7c9332006-12-02 22:04:04 -0800181 int delim, const char **end)
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900182{
183 const char *s, *tok = NULL;
184 u8 *d, *dc = NULL;
185 u8 dbuf[16];
186 int ret = 0;
187 int i;
188 int state = IN6PTON_COLON_1_2 | IN6PTON_XDIGIT | IN6PTON_NULL;
189 int w = 0;
190
191 memset(dbuf, 0, sizeof(dbuf));
192
193 s = src;
194 d = dbuf;
195 if (srclen < 0)
196 srclen = strlen(src);
197
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900198 while (1) {
199 int c;
200
201 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
202 if (!(c & state))
203 goto out;
204 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
205 /* process one 16-bit word */
206 if (!(state & IN6PTON_NULL)) {
207 *d++ = (w >> 8) & 0xff;
208 *d++ = w & 0xff;
209 }
210 w = 0;
211 if (c & IN6PTON_DELIM) {
212 /* We've processed last word */
213 break;
214 }
215 /*
216 * COLON_1 => XDIGIT
217 * COLON_2 => XDIGIT|DELIM
218 * COLON_1_2 => COLON_2
219 */
220 switch (state & IN6PTON_COLON_MASK) {
221 case IN6PTON_COLON_2:
222 dc = d;
223 state = IN6PTON_XDIGIT | IN6PTON_DELIM;
224 if (dc - dbuf >= sizeof(dbuf))
225 state |= IN6PTON_NULL;
226 break;
227 case IN6PTON_COLON_1|IN6PTON_COLON_1_2:
228 state = IN6PTON_XDIGIT | IN6PTON_COLON_2;
229 break;
230 case IN6PTON_COLON_1:
231 state = IN6PTON_XDIGIT;
232 break;
233 case IN6PTON_COLON_1_2:
234 state = IN6PTON_COLON_2;
235 break;
236 default:
237 state = 0;
238 }
239 tok = s + 1;
240 goto cont;
241 }
242
243 if (c & IN6PTON_DOT) {
244 ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s);
245 if (ret > 0) {
246 d += 4;
247 break;
248 }
249 goto out;
250 }
251
252 w = (w << 4) | (0xff & c);
253 state = IN6PTON_COLON_1 | IN6PTON_DELIM;
254 if (!(w & 0xf000)) {
255 state |= IN6PTON_XDIGIT;
256 }
257 if (!dc && d + 2 < dbuf + sizeof(dbuf)) {
258 state |= IN6PTON_COLON_1_2;
259 state &= ~IN6PTON_DELIM;
260 }
261 if (d + 2 >= dbuf + sizeof(dbuf)) {
262 state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2);
263 }
264cont:
265 if ((dc && d + 4 < dbuf + sizeof(dbuf)) ||
266 d + 4 == dbuf + sizeof(dbuf)) {
267 state |= IN6PTON_DOT;
268 }
269 if (d >= dbuf + sizeof(dbuf)) {
270 state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK);
271 }
272 s++;
273 srclen--;
274 }
275
276 i = 15; d--;
277
278 if (dc) {
279 while(d >= dc)
280 dst[i--] = *d--;
281 while(i >= dc - dbuf)
282 dst[i--] = 0;
283 while(i >= 0)
284 dst[i--] = *d--;
285 } else
286 memcpy(dst, dbuf, sizeof(dbuf));
287
288 ret = 1;
289out:
290 if (end)
291 *end = s;
292 return ret;
293}
294
295EXPORT_SYMBOL(in6_pton);