Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Generic address resultion entity | |
3 | * | |
4 | * Authors: | |
5 | * net_random Alan Cox | |
75b31c33 | 6 | * net_ratelimit Andi Kleen |
1aaec67f | 7 | * in{4,6}_pton YOSHIFUJI Hideaki, Copyright (C)2006 USAGI/WIDE Project |
1da177e4 LT |
8 | * |
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> | |
20380731 | 20 | #include <linux/inet.h> |
1da177e4 | 21 | #include <linux/mm.h> |
20380731 | 22 | #include <linux/net.h> |
1da177e4 LT |
23 | #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 | ||
5e43db77 | 29 | #include <asm/byteorder.h> |
1da177e4 LT |
30 | #include <asm/system.h> |
31 | #include <asm/uaccess.h> | |
32 | ||
1da177e4 LT |
33 | int net_msg_cost = 5*HZ; |
34 | int net_msg_burst = 10; | |
35 | ||
36 | /* | |
37 | * All net warning printk()s should be guarded by this function. | |
38 | */ | |
39 | int net_ratelimit(void) | |
40 | { | |
41 | return __printk_ratelimit(net_msg_cost, net_msg_burst); | |
42 | } | |
1da177e4 | 43 | EXPORT_SYMBOL(net_ratelimit); |
5e43db77 MM |
44 | |
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 | ||
a2167dc6 | 51 | __be32 in_aton(const char *str) |
5e43db77 MM |
52 | { |
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; | |
1e2e5659 | 64 | while (*str != '\0' && *str != '.' && *str != '\n') |
5e43db77 MM |
65 | { |
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 | ||
78 | EXPORT_SYMBOL(in_aton); | |
1aaec67f YH |
79 | |
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 | ||
91 | static inline int digit2bin(char c, char delim) | |
92 | { | |
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 | ||
102 | static inline int xdigit2bin(char c, char delim) | |
103 | { | |
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)); | |
116 | return IN6PTON_UNKNOWN; | |
117 | } | |
118 | ||
119 | int in4_pton(const char *src, int srclen, | |
120 | u8 *dst, | |
121 | char delim, const char **end) | |
122 | { | |
123 | const char *s; | |
124 | u8 *d; | |
125 | u8 dbuf[4]; | |
126 | int ret = 0; | |
127 | int i; | |
128 | int w = 0; | |
129 | ||
130 | if (srclen < 0) | |
131 | srclen = strlen(src); | |
132 | s = src; | |
133 | d = dbuf; | |
134 | i = 0; | |
135 | while(1) { | |
136 | int c; | |
137 | c = xdigit2bin(srclen > 0 ? *s : '\0', delim); | |
138 | if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM))) { | |
139 | goto out; | |
140 | } | |
141 | if (c & (IN6PTON_DOT | IN6PTON_DELIM)) { | |
142 | if (w == 0) | |
143 | goto out; | |
144 | *d++ = w & 0xff; | |
145 | w = 0; | |
146 | i++; | |
147 | if (c & IN6PTON_DELIM) { | |
148 | if (i != 4) | |
149 | goto out; | |
150 | break; | |
151 | } | |
152 | goto cont; | |
153 | } | |
154 | w = (w * 10) + c; | |
155 | if ((w & 0xffff) > 255) { | |
156 | goto out; | |
157 | } | |
158 | cont: | |
159 | if (i >= 4) | |
160 | goto out; | |
161 | s++; | |
162 | srclen--; | |
163 | } | |
164 | ret = 1; | |
165 | memcpy(dst, dbuf, sizeof(dbuf)); | |
166 | out: | |
167 | if (end) | |
168 | *end = s; | |
169 | return ret; | |
170 | } | |
171 | ||
172 | EXPORT_SYMBOL(in4_pton); | |
173 | ||
174 | int in6_pton(const char *src, int srclen, | |
175 | u8 *dst, | |
176 | char delim, const char **end) | |
177 | { | |
178 | const char *s, *tok = NULL; | |
179 | u8 *d, *dc = NULL; | |
180 | u8 dbuf[16]; | |
181 | int ret = 0; | |
182 | int i; | |
183 | int state = IN6PTON_COLON_1_2 | IN6PTON_XDIGIT | IN6PTON_NULL; | |
184 | int w = 0; | |
185 | ||
186 | memset(dbuf, 0, sizeof(dbuf)); | |
187 | ||
188 | s = src; | |
189 | d = dbuf; | |
190 | if (srclen < 0) | |
191 | srclen = strlen(src); | |
192 | ||
1aaec67f YH |
193 | while (1) { |
194 | int c; | |
195 | ||
196 | c = xdigit2bin(srclen > 0 ? *s : '\0', delim); | |
197 | if (!(c & state)) | |
198 | goto out; | |
199 | if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) { | |
200 | /* process one 16-bit word */ | |
201 | if (!(state & IN6PTON_NULL)) { | |
202 | *d++ = (w >> 8) & 0xff; | |
203 | *d++ = w & 0xff; | |
204 | } | |
205 | w = 0; | |
206 | if (c & IN6PTON_DELIM) { | |
207 | /* We've processed last word */ | |
208 | break; | |
209 | } | |
210 | /* | |
211 | * COLON_1 => XDIGIT | |
212 | * COLON_2 => XDIGIT|DELIM | |
213 | * COLON_1_2 => COLON_2 | |
214 | */ | |
215 | switch (state & IN6PTON_COLON_MASK) { | |
216 | case IN6PTON_COLON_2: | |
217 | dc = d; | |
218 | state = IN6PTON_XDIGIT | IN6PTON_DELIM; | |
219 | if (dc - dbuf >= sizeof(dbuf)) | |
220 | state |= IN6PTON_NULL; | |
221 | break; | |
222 | case IN6PTON_COLON_1|IN6PTON_COLON_1_2: | |
223 | state = IN6PTON_XDIGIT | IN6PTON_COLON_2; | |
224 | break; | |
225 | case IN6PTON_COLON_1: | |
226 | state = IN6PTON_XDIGIT; | |
227 | break; | |
228 | case IN6PTON_COLON_1_2: | |
229 | state = IN6PTON_COLON_2; | |
230 | break; | |
231 | default: | |
232 | state = 0; | |
233 | } | |
234 | tok = s + 1; | |
235 | goto cont; | |
236 | } | |
237 | ||
238 | if (c & IN6PTON_DOT) { | |
239 | ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s); | |
240 | if (ret > 0) { | |
241 | d += 4; | |
242 | break; | |
243 | } | |
244 | goto out; | |
245 | } | |
246 | ||
247 | w = (w << 4) | (0xff & c); | |
248 | state = IN6PTON_COLON_1 | IN6PTON_DELIM; | |
249 | if (!(w & 0xf000)) { | |
250 | state |= IN6PTON_XDIGIT; | |
251 | } | |
252 | if (!dc && d + 2 < dbuf + sizeof(dbuf)) { | |
253 | state |= IN6PTON_COLON_1_2; | |
254 | state &= ~IN6PTON_DELIM; | |
255 | } | |
256 | if (d + 2 >= dbuf + sizeof(dbuf)) { | |
257 | state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2); | |
258 | } | |
259 | cont: | |
260 | if ((dc && d + 4 < dbuf + sizeof(dbuf)) || | |
261 | d + 4 == dbuf + sizeof(dbuf)) { | |
262 | state |= IN6PTON_DOT; | |
263 | } | |
264 | if (d >= dbuf + sizeof(dbuf)) { | |
265 | state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK); | |
266 | } | |
267 | s++; | |
268 | srclen--; | |
269 | } | |
270 | ||
271 | i = 15; d--; | |
272 | ||
273 | if (dc) { | |
274 | while(d >= dc) | |
275 | dst[i--] = *d--; | |
276 | while(i >= dc - dbuf) | |
277 | dst[i--] = 0; | |
278 | while(i >= 0) | |
279 | dst[i--] = *d--; | |
280 | } else | |
281 | memcpy(dst, dbuf, sizeof(dbuf)); | |
282 | ||
283 | ret = 1; | |
284 | out: | |
285 | if (end) | |
286 | *end = s; | |
287 | return ret; | |
288 | } | |
289 | ||
290 | EXPORT_SYMBOL(in6_pton); |