blob: 61556065f07ec23b3d115fa05a71b156b0ae2ce1 [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>
28
Matt Mackall5e43db72005-07-27 15:24:42 -070029#include <asm/byteorder.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <asm/system.h>
31#include <asm/uaccess.h>
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033int net_msg_cost = 5*HZ;
34int net_msg_burst = 10;
35
36/*
37 * All net warning printk()s should be guarded by this function.
38 */
39int net_ratelimit(void)
40{
41 return __printk_ratelimit(net_msg_cost, net_msg_burst);
42}
Linus Torvalds1da177e2005-04-16 15:20:36 -070043EXPORT_SYMBOL(net_ratelimit);
Matt Mackall5e43db72005-07-27 15:24:42 -070044
45/*
46 * Convert an ASCII string to binary IP.
47 * This is outside of net/ipv4/ because various code that uses IP addresses
48 * is otherwise not dependent on the TCP/IP stack.
49 */
50
Alexey Dobriyana2167dc2006-01-06 13:24:54 -080051__be32 in_aton(const char *str)
Matt Mackall5e43db72005-07-27 15:24:42 -070052{
53 unsigned long l;
54 unsigned int val;
55 int i;
56
57 l = 0;
58 for (i = 0; i < 4; i++)
59 {
60 l <<= 8;
61 if (*str != '\0')
62 {
63 val = 0;
Mitch Williams1e2e5652005-11-09 10:34:01 -080064 while (*str != '\0' && *str != '.' && *str != '\n')
Matt Mackall5e43db72005-07-27 15:24:42 -070065 {
66 val *= 10;
67 val += *str - '0';
68 str++;
69 }
70 l |= val;
71 if (*str != '\0')
72 str++;
73 }
74 }
75 return(htonl(l));
76}
77
78EXPORT_SYMBOL(in_aton);
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +090079
80#define IN6PTON_XDIGIT 0x00010000
81#define IN6PTON_DIGIT 0x00020000
82#define IN6PTON_COLON_MASK 0x00700000
83#define IN6PTON_COLON_1 0x00100000 /* single : requested */
84#define IN6PTON_COLON_2 0x00200000 /* second : requested */
85#define IN6PTON_COLON_1_2 0x00400000 /* :: requested */
86#define IN6PTON_DOT 0x00800000 /* . */
87#define IN6PTON_DELIM 0x10000000
88#define IN6PTON_NULL 0x20000000 /* first/tail */
89#define IN6PTON_UNKNOWN 0x40000000
90
Patrick McHardy9a7c9332006-12-02 22:04:04 -080091static inline int digit2bin(char c, int delim)
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +090092{
93 if (c == delim || c == '\0')
94 return IN6PTON_DELIM;
95 if (c == '.')
96 return IN6PTON_DOT;
97 if (c >= '0' && c <= '9')
98 return (IN6PTON_DIGIT | (c - '0'));
99 return IN6PTON_UNKNOWN;
100}
101
Patrick McHardy9a7c9332006-12-02 22:04:04 -0800102static inline int xdigit2bin(char c, int delim)
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900103{
104 if (c == delim || c == '\0')
105 return IN6PTON_DELIM;
106 if (c == ':')
107 return IN6PTON_COLON_MASK;
108 if (c == '.')
109 return IN6PTON_DOT;
110 if (c >= '0' && c <= '9')
111 return (IN6PTON_XDIGIT | IN6PTON_DIGIT| (c - '0'));
112 if (c >= 'a' && c <= 'f')
113 return (IN6PTON_XDIGIT | (c - 'a' + 10));
114 if (c >= 'A' && c <= 'F')
115 return (IN6PTON_XDIGIT | (c - 'A' + 10));
Patrick McHardy9a7c9332006-12-02 22:04:04 -0800116 if (delim == -1)
117 return IN6PTON_DELIM;
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900118 return IN6PTON_UNKNOWN;
119}
120
121int in4_pton(const char *src, int srclen,
122 u8 *dst,
Patrick McHardy9a7c9332006-12-02 22:04:04 -0800123 int delim, const char **end)
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900124{
125 const char *s;
126 u8 *d;
127 u8 dbuf[4];
128 int ret = 0;
129 int i;
130 int w = 0;
131
132 if (srclen < 0)
133 srclen = strlen(src);
134 s = src;
135 d = dbuf;
136 i = 0;
137 while(1) {
138 int c;
139 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
140 if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM))) {
141 goto out;
142 }
143 if (c & (IN6PTON_DOT | IN6PTON_DELIM)) {
144 if (w == 0)
145 goto out;
146 *d++ = w & 0xff;
147 w = 0;
148 i++;
149 if (c & IN6PTON_DELIM) {
150 if (i != 4)
151 goto out;
152 break;
153 }
154 goto cont;
155 }
156 w = (w * 10) + c;
157 if ((w & 0xffff) > 255) {
158 goto out;
159 }
160cont:
161 if (i >= 4)
162 goto out;
163 s++;
164 srclen--;
165 }
166 ret = 1;
167 memcpy(dst, dbuf, sizeof(dbuf));
168out:
169 if (end)
170 *end = s;
171 return ret;
172}
173
174EXPORT_SYMBOL(in4_pton);
175
176int in6_pton(const char *src, int srclen,
177 u8 *dst,
Patrick McHardy9a7c9332006-12-02 22:04:04 -0800178 int delim, const char **end)
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900179{
180 const char *s, *tok = NULL;
181 u8 *d, *dc = NULL;
182 u8 dbuf[16];
183 int ret = 0;
184 int i;
185 int state = IN6PTON_COLON_1_2 | IN6PTON_XDIGIT | IN6PTON_NULL;
186 int w = 0;
187
188 memset(dbuf, 0, sizeof(dbuf));
189
190 s = src;
191 d = dbuf;
192 if (srclen < 0)
193 srclen = strlen(src);
194
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900195 while (1) {
196 int c;
197
198 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
199 if (!(c & state))
200 goto out;
201 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
202 /* process one 16-bit word */
203 if (!(state & IN6PTON_NULL)) {
204 *d++ = (w >> 8) & 0xff;
205 *d++ = w & 0xff;
206 }
207 w = 0;
208 if (c & IN6PTON_DELIM) {
209 /* We've processed last word */
210 break;
211 }
212 /*
213 * COLON_1 => XDIGIT
214 * COLON_2 => XDIGIT|DELIM
215 * COLON_1_2 => COLON_2
216 */
217 switch (state & IN6PTON_COLON_MASK) {
218 case IN6PTON_COLON_2:
219 dc = d;
220 state = IN6PTON_XDIGIT | IN6PTON_DELIM;
221 if (dc - dbuf >= sizeof(dbuf))
222 state |= IN6PTON_NULL;
223 break;
224 case IN6PTON_COLON_1|IN6PTON_COLON_1_2:
225 state = IN6PTON_XDIGIT | IN6PTON_COLON_2;
226 break;
227 case IN6PTON_COLON_1:
228 state = IN6PTON_XDIGIT;
229 break;
230 case IN6PTON_COLON_1_2:
231 state = IN6PTON_COLON_2;
232 break;
233 default:
234 state = 0;
235 }
236 tok = s + 1;
237 goto cont;
238 }
239
240 if (c & IN6PTON_DOT) {
241 ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s);
242 if (ret > 0) {
243 d += 4;
244 break;
245 }
246 goto out;
247 }
248
249 w = (w << 4) | (0xff & c);
250 state = IN6PTON_COLON_1 | IN6PTON_DELIM;
251 if (!(w & 0xf000)) {
252 state |= IN6PTON_XDIGIT;
253 }
254 if (!dc && d + 2 < dbuf + sizeof(dbuf)) {
255 state |= IN6PTON_COLON_1_2;
256 state &= ~IN6PTON_DELIM;
257 }
258 if (d + 2 >= dbuf + sizeof(dbuf)) {
259 state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2);
260 }
261cont:
262 if ((dc && d + 4 < dbuf + sizeof(dbuf)) ||
263 d + 4 == dbuf + sizeof(dbuf)) {
264 state |= IN6PTON_DOT;
265 }
266 if (d >= dbuf + sizeof(dbuf)) {
267 state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK);
268 }
269 s++;
270 srclen--;
271 }
272
273 i = 15; d--;
274
275 if (dc) {
276 while(d >= dc)
277 dst[i--] = *d--;
278 while(i >= dc - dbuf)
279 dst[i--] = 0;
280 while(i >= 0)
281 dst[i--] = *d--;
282 } else
283 memcpy(dst, dbuf, sizeof(dbuf));
284
285 ret = 1;
286out:
287 if (end)
288 *end = s;
289 return ret;
290}
291
292EXPORT_SYMBOL(in6_pton);