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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 | ||
6dea649a ED |
33 | int net_msg_cost __read_mostly = 5*HZ; |
34 | int net_msg_burst __read_mostly = 10; | |
35 | int net_msg_warn __read_mostly = 1; | |
a2a316fd | 36 | EXPORT_SYMBOL(net_msg_warn); |
1da177e4 | 37 | |
4ec93edb | 38 | /* |
1da177e4 | 39 | * All net warning printk()s should be guarded by this function. |
4ec93edb | 40 | */ |
1da177e4 LT |
41 | int net_ratelimit(void) |
42 | { | |
43 | return __printk_ratelimit(net_msg_cost, net_msg_burst); | |
44 | } | |
1da177e4 | 45 | EXPORT_SYMBOL(net_ratelimit); |
5e43db77 MM |
46 | |
47 | /* | |
48 | * Convert an ASCII string to binary IP. | |
49 | * This is outside of net/ipv4/ because various code that uses IP addresses | |
50 | * is otherwise not dependent on the TCP/IP stack. | |
51 | */ | |
52 | ||
a2167dc6 | 53 | __be32 in_aton(const char *str) |
5e43db77 MM |
54 | { |
55 | unsigned long l; | |
56 | unsigned int val; | |
57 | int i; | |
58 | ||
59 | l = 0; | |
60 | for (i = 0; i < 4; i++) | |
61 | { | |
62 | l <<= 8; | |
63 | if (*str != '\0') | |
64 | { | |
65 | val = 0; | |
1e2e5659 | 66 | while (*str != '\0' && *str != '.' && *str != '\n') |
5e43db77 MM |
67 | { |
68 | val *= 10; | |
69 | val += *str - '0'; | |
70 | str++; | |
71 | } | |
72 | l |= val; | |
73 | if (*str != '\0') | |
74 | str++; | |
75 | } | |
76 | } | |
77 | return(htonl(l)); | |
78 | } | |
79 | ||
80 | EXPORT_SYMBOL(in_aton); | |
1aaec67f YH |
81 | |
82 | #define IN6PTON_XDIGIT 0x00010000 | |
83 | #define IN6PTON_DIGIT 0x00020000 | |
84 | #define IN6PTON_COLON_MASK 0x00700000 | |
85 | #define IN6PTON_COLON_1 0x00100000 /* single : requested */ | |
86 | #define IN6PTON_COLON_2 0x00200000 /* second : requested */ | |
87 | #define IN6PTON_COLON_1_2 0x00400000 /* :: requested */ | |
88 | #define IN6PTON_DOT 0x00800000 /* . */ | |
89 | #define IN6PTON_DELIM 0x10000000 | |
90 | #define IN6PTON_NULL 0x20000000 /* first/tail */ | |
91 | #define IN6PTON_UNKNOWN 0x40000000 | |
92 | ||
9a7c9337 | 93 | static inline int digit2bin(char c, int delim) |
1aaec67f YH |
94 | { |
95 | if (c == delim || c == '\0') | |
96 | return IN6PTON_DELIM; | |
97 | if (c == '.') | |
98 | return IN6PTON_DOT; | |
99 | if (c >= '0' && c <= '9') | |
100 | return (IN6PTON_DIGIT | (c - '0')); | |
101 | return IN6PTON_UNKNOWN; | |
102 | } | |
103 | ||
9a7c9337 | 104 | static inline int xdigit2bin(char c, int delim) |
1aaec67f YH |
105 | { |
106 | if (c == delim || c == '\0') | |
107 | return IN6PTON_DELIM; | |
108 | if (c == ':') | |
109 | return IN6PTON_COLON_MASK; | |
110 | if (c == '.') | |
111 | return IN6PTON_DOT; | |
112 | if (c >= '0' && c <= '9') | |
113 | return (IN6PTON_XDIGIT | IN6PTON_DIGIT| (c - '0')); | |
114 | if (c >= 'a' && c <= 'f') | |
115 | return (IN6PTON_XDIGIT | (c - 'a' + 10)); | |
116 | if (c >= 'A' && c <= 'F') | |
117 | return (IN6PTON_XDIGIT | (c - 'A' + 10)); | |
9a7c9337 PM |
118 | if (delim == -1) |
119 | return IN6PTON_DELIM; | |
1aaec67f YH |
120 | return IN6PTON_UNKNOWN; |
121 | } | |
122 | ||
123 | int in4_pton(const char *src, int srclen, | |
124 | u8 *dst, | |
9a7c9337 | 125 | int delim, const char **end) |
1aaec67f YH |
126 | { |
127 | const char *s; | |
128 | u8 *d; | |
129 | u8 dbuf[4]; | |
130 | int ret = 0; | |
131 | int i; | |
132 | int w = 0; | |
133 | ||
134 | if (srclen < 0) | |
135 | srclen = strlen(src); | |
136 | s = src; | |
137 | d = dbuf; | |
138 | i = 0; | |
139 | while(1) { | |
140 | int c; | |
141 | c = xdigit2bin(srclen > 0 ? *s : '\0', delim); | |
83f03fa5 | 142 | if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) { |
1aaec67f YH |
143 | goto out; |
144 | } | |
83f03fa5 | 145 | if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) { |
1aaec67f YH |
146 | if (w == 0) |
147 | goto out; | |
148 | *d++ = w & 0xff; | |
149 | w = 0; | |
150 | i++; | |
83f03fa5 | 151 | if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) { |
1aaec67f YH |
152 | if (i != 4) |
153 | goto out; | |
154 | break; | |
155 | } | |
156 | goto cont; | |
157 | } | |
158 | w = (w * 10) + c; | |
159 | if ((w & 0xffff) > 255) { | |
160 | goto out; | |
161 | } | |
162 | cont: | |
163 | if (i >= 4) | |
164 | goto out; | |
165 | s++; | |
166 | srclen--; | |
167 | } | |
168 | ret = 1; | |
169 | memcpy(dst, dbuf, sizeof(dbuf)); | |
170 | out: | |
171 | if (end) | |
172 | *end = s; | |
173 | return ret; | |
174 | } | |
175 | ||
176 | EXPORT_SYMBOL(in4_pton); | |
177 | ||
178 | int in6_pton(const char *src, int srclen, | |
179 | u8 *dst, | |
9a7c9337 | 180 | int delim, const char **end) |
1aaec67f YH |
181 | { |
182 | const char *s, *tok = NULL; | |
183 | u8 *d, *dc = NULL; | |
184 | u8 dbuf[16]; | |
185 | int ret = 0; | |
186 | int i; | |
187 | int state = IN6PTON_COLON_1_2 | IN6PTON_XDIGIT | IN6PTON_NULL; | |
188 | int w = 0; | |
189 | ||
190 | memset(dbuf, 0, sizeof(dbuf)); | |
191 | ||
192 | s = src; | |
193 | d = dbuf; | |
194 | if (srclen < 0) | |
195 | srclen = strlen(src); | |
196 | ||
1aaec67f YH |
197 | while (1) { |
198 | int c; | |
199 | ||
200 | c = xdigit2bin(srclen > 0 ? *s : '\0', delim); | |
201 | if (!(c & state)) | |
202 | goto out; | |
203 | if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) { | |
204 | /* process one 16-bit word */ | |
205 | if (!(state & IN6PTON_NULL)) { | |
206 | *d++ = (w >> 8) & 0xff; | |
207 | *d++ = w & 0xff; | |
208 | } | |
209 | w = 0; | |
210 | if (c & IN6PTON_DELIM) { | |
211 | /* We've processed last word */ | |
212 | break; | |
213 | } | |
214 | /* | |
215 | * COLON_1 => XDIGIT | |
216 | * COLON_2 => XDIGIT|DELIM | |
217 | * COLON_1_2 => COLON_2 | |
218 | */ | |
219 | switch (state & IN6PTON_COLON_MASK) { | |
220 | case IN6PTON_COLON_2: | |
221 | dc = d; | |
222 | state = IN6PTON_XDIGIT | IN6PTON_DELIM; | |
223 | if (dc - dbuf >= sizeof(dbuf)) | |
224 | state |= IN6PTON_NULL; | |
225 | break; | |
226 | case IN6PTON_COLON_1|IN6PTON_COLON_1_2: | |
227 | state = IN6PTON_XDIGIT | IN6PTON_COLON_2; | |
228 | break; | |
229 | case IN6PTON_COLON_1: | |
230 | state = IN6PTON_XDIGIT; | |
231 | break; | |
232 | case IN6PTON_COLON_1_2: | |
233 | state = IN6PTON_COLON_2; | |
234 | break; | |
235 | default: | |
236 | state = 0; | |
237 | } | |
238 | tok = s + 1; | |
239 | goto cont; | |
240 | } | |
241 | ||
242 | if (c & IN6PTON_DOT) { | |
243 | ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s); | |
244 | if (ret > 0) { | |
245 | d += 4; | |
246 | break; | |
247 | } | |
248 | goto out; | |
249 | } | |
250 | ||
251 | w = (w << 4) | (0xff & c); | |
252 | state = IN6PTON_COLON_1 | IN6PTON_DELIM; | |
253 | if (!(w & 0xf000)) { | |
254 | state |= IN6PTON_XDIGIT; | |
255 | } | |
256 | if (!dc && d + 2 < dbuf + sizeof(dbuf)) { | |
257 | state |= IN6PTON_COLON_1_2; | |
258 | state &= ~IN6PTON_DELIM; | |
259 | } | |
260 | if (d + 2 >= dbuf + sizeof(dbuf)) { | |
261 | state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2); | |
262 | } | |
263 | cont: | |
264 | if ((dc && d + 4 < dbuf + sizeof(dbuf)) || | |
265 | d + 4 == dbuf + sizeof(dbuf)) { | |
266 | state |= IN6PTON_DOT; | |
267 | } | |
268 | if (d >= dbuf + sizeof(dbuf)) { | |
269 | state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK); | |
270 | } | |
271 | s++; | |
272 | srclen--; | |
273 | } | |
274 | ||
275 | i = 15; d--; | |
276 | ||
277 | if (dc) { | |
278 | while(d >= dc) | |
279 | dst[i--] = *d--; | |
280 | while(i >= dc - dbuf) | |
281 | dst[i--] = 0; | |
282 | while(i >= 0) | |
283 | dst[i--] = *d--; | |
284 | } else | |
285 | memcpy(dst, dbuf, sizeof(dbuf)); | |
286 | ||
287 | ret = 1; | |
288 | out: | |
289 | if (end) | |
290 | *end = s; | |
291 | return ret; | |
292 | } | |
293 | ||
294 | EXPORT_SYMBOL(in6_pton); |