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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> | |
14ae8566 | 28 | #include <net/sock.h> |
1da177e4 | 29 | |
5e43db77 | 30 | #include <asm/byteorder.h> |
1da177e4 LT |
31 | #include <asm/system.h> |
32 | #include <asm/uaccess.h> | |
33 | ||
6dea649a ED |
34 | int net_msg_cost __read_mostly = 5*HZ; |
35 | int net_msg_burst __read_mostly = 10; | |
36 | int net_msg_warn __read_mostly = 1; | |
a2a316fd | 37 | EXPORT_SYMBOL(net_msg_warn); |
1da177e4 | 38 | |
4ec93edb | 39 | /* |
1da177e4 | 40 | * All net warning printk()s should be guarded by this function. |
4ec93edb | 41 | */ |
1da177e4 LT |
42 | int net_ratelimit(void) |
43 | { | |
44 | return __printk_ratelimit(net_msg_cost, net_msg_burst); | |
45 | } | |
1da177e4 | 46 | EXPORT_SYMBOL(net_ratelimit); |
5e43db77 MM |
47 | |
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 | ||
a2167dc6 | 54 | __be32 in_aton(const char *str) |
5e43db77 MM |
55 | { |
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; | |
1e2e5659 | 67 | while (*str != '\0' && *str != '.' && *str != '\n') |
5e43db77 MM |
68 | { |
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 | ||
81 | EXPORT_SYMBOL(in_aton); | |
1aaec67f YH |
82 | |
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 | ||
9a7c9337 | 94 | static inline int digit2bin(char c, int delim) |
1aaec67f YH |
95 | { |
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 | ||
9a7c9337 | 105 | static inline int xdigit2bin(char c, int delim) |
1aaec67f YH |
106 | { |
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)); | |
9a7c9337 PM |
119 | if (delim == -1) |
120 | return IN6PTON_DELIM; | |
1aaec67f YH |
121 | return IN6PTON_UNKNOWN; |
122 | } | |
123 | ||
124 | int in4_pton(const char *src, int srclen, | |
125 | u8 *dst, | |
9a7c9337 | 126 | int delim, const char **end) |
1aaec67f YH |
127 | { |
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); | |
83f03fa5 | 143 | if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) { |
1aaec67f YH |
144 | goto out; |
145 | } | |
83f03fa5 | 146 | if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) { |
1aaec67f YH |
147 | if (w == 0) |
148 | goto out; | |
149 | *d++ = w & 0xff; | |
150 | w = 0; | |
151 | i++; | |
83f03fa5 | 152 | if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) { |
1aaec67f YH |
153 | 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 | } | |
163 | cont: | |
164 | if (i >= 4) | |
165 | goto out; | |
166 | s++; | |
167 | srclen--; | |
168 | } | |
169 | ret = 1; | |
170 | memcpy(dst, dbuf, sizeof(dbuf)); | |
171 | out: | |
172 | if (end) | |
173 | *end = s; | |
174 | return ret; | |
175 | } | |
176 | ||
177 | EXPORT_SYMBOL(in4_pton); | |
178 | ||
179 | int in6_pton(const char *src, int srclen, | |
180 | u8 *dst, | |
9a7c9337 | 181 | int delim, const char **end) |
1aaec67f YH |
182 | { |
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 | ||
1aaec67f YH |
198 | 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 | } | |
264 | cont: | |
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; | |
289 | out: | |
290 | if (end) | |
291 | *end = s; | |
292 | return ret; | |
293 | } | |
294 | ||
295 | EXPORT_SYMBOL(in6_pton); |