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> | |
1da177e4 LT |
25 | #include <linux/percpu.h> |
26 | #include <linux/init.h> | |
14ae8566 | 27 | #include <net/sock.h> |
1da177e4 | 28 | |
5e43db77 | 29 | #include <asm/byteorder.h> |
1da177e4 LT |
30 | #include <asm/system.h> |
31 | #include <asm/uaccess.h> | |
32 | ||
6dea649a | 33 | int net_msg_warn __read_mostly = 1; |
a2a316fd | 34 | EXPORT_SYMBOL(net_msg_warn); |
1da177e4 | 35 | |
717115e1 | 36 | DEFINE_RATELIMIT_STATE(net_ratelimit_state, 5 * HZ, 10); |
4ec93edb | 37 | /* |
1da177e4 | 38 | * All net warning printk()s should be guarded by this function. |
4ec93edb | 39 | */ |
1da177e4 LT |
40 | int net_ratelimit(void) |
41 | { | |
717115e1 | 42 | return __ratelimit(&net_ratelimit_state); |
1da177e4 | 43 | } |
1da177e4 | 44 | EXPORT_SYMBOL(net_ratelimit); |
5e43db77 MM |
45 | |
46 | /* | |
47 | * Convert an ASCII string to binary IP. | |
48 | * This is outside of net/ipv4/ because various code that uses IP addresses | |
49 | * is otherwise not dependent on the TCP/IP stack. | |
50 | */ | |
51 | ||
a2167dc6 | 52 | __be32 in_aton(const char *str) |
5e43db77 MM |
53 | { |
54 | unsigned long l; | |
55 | unsigned int val; | |
56 | int i; | |
57 | ||
58 | l = 0; | |
59 | for (i = 0; i < 4; i++) | |
60 | { | |
61 | l <<= 8; | |
62 | if (*str != '\0') | |
63 | { | |
64 | val = 0; | |
1e2e5659 | 65 | while (*str != '\0' && *str != '.' && *str != '\n') |
5e43db77 MM |
66 | { |
67 | val *= 10; | |
68 | val += *str - '0'; | |
69 | str++; | |
70 | } | |
71 | l |= val; | |
72 | if (*str != '\0') | |
73 | str++; | |
74 | } | |
75 | } | |
76 | return(htonl(l)); | |
77 | } | |
78 | ||
79 | EXPORT_SYMBOL(in_aton); | |
1aaec67f YH |
80 | |
81 | #define IN6PTON_XDIGIT 0x00010000 | |
82 | #define IN6PTON_DIGIT 0x00020000 | |
83 | #define IN6PTON_COLON_MASK 0x00700000 | |
84 | #define IN6PTON_COLON_1 0x00100000 /* single : requested */ | |
85 | #define IN6PTON_COLON_2 0x00200000 /* second : requested */ | |
86 | #define IN6PTON_COLON_1_2 0x00400000 /* :: requested */ | |
87 | #define IN6PTON_DOT 0x00800000 /* . */ | |
88 | #define IN6PTON_DELIM 0x10000000 | |
89 | #define IN6PTON_NULL 0x20000000 /* first/tail */ | |
90 | #define IN6PTON_UNKNOWN 0x40000000 | |
91 | ||
9a7c9337 | 92 | static inline int xdigit2bin(char c, int delim) |
1aaec67f YH |
93 | { |
94 | if (c == delim || c == '\0') | |
95 | return IN6PTON_DELIM; | |
96 | if (c == ':') | |
97 | return IN6PTON_COLON_MASK; | |
98 | if (c == '.') | |
99 | return IN6PTON_DOT; | |
100 | if (c >= '0' && c <= '9') | |
101 | return (IN6PTON_XDIGIT | IN6PTON_DIGIT| (c - '0')); | |
102 | if (c >= 'a' && c <= 'f') | |
103 | return (IN6PTON_XDIGIT | (c - 'a' + 10)); | |
104 | if (c >= 'A' && c <= 'F') | |
105 | return (IN6PTON_XDIGIT | (c - 'A' + 10)); | |
9a7c9337 PM |
106 | if (delim == -1) |
107 | return IN6PTON_DELIM; | |
1aaec67f YH |
108 | return IN6PTON_UNKNOWN; |
109 | } | |
110 | ||
111 | int in4_pton(const char *src, int srclen, | |
112 | u8 *dst, | |
9a7c9337 | 113 | int delim, const char **end) |
1aaec67f YH |
114 | { |
115 | const char *s; | |
116 | u8 *d; | |
117 | u8 dbuf[4]; | |
118 | int ret = 0; | |
119 | int i; | |
120 | int w = 0; | |
121 | ||
122 | if (srclen < 0) | |
123 | srclen = strlen(src); | |
124 | s = src; | |
125 | d = dbuf; | |
126 | i = 0; | |
127 | while(1) { | |
128 | int c; | |
129 | c = xdigit2bin(srclen > 0 ? *s : '\0', delim); | |
83f03fa5 | 130 | if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) { |
1aaec67f YH |
131 | goto out; |
132 | } | |
83f03fa5 | 133 | if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) { |
1aaec67f YH |
134 | if (w == 0) |
135 | goto out; | |
136 | *d++ = w & 0xff; | |
137 | w = 0; | |
138 | i++; | |
83f03fa5 | 139 | if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) { |
1aaec67f YH |
140 | if (i != 4) |
141 | goto out; | |
142 | break; | |
143 | } | |
144 | goto cont; | |
145 | } | |
146 | w = (w * 10) + c; | |
147 | if ((w & 0xffff) > 255) { | |
148 | goto out; | |
149 | } | |
150 | cont: | |
151 | if (i >= 4) | |
152 | goto out; | |
153 | s++; | |
154 | srclen--; | |
155 | } | |
156 | ret = 1; | |
157 | memcpy(dst, dbuf, sizeof(dbuf)); | |
158 | out: | |
159 | if (end) | |
160 | *end = s; | |
161 | return ret; | |
162 | } | |
163 | ||
164 | EXPORT_SYMBOL(in4_pton); | |
165 | ||
166 | int in6_pton(const char *src, int srclen, | |
167 | u8 *dst, | |
9a7c9337 | 168 | int delim, const char **end) |
1aaec67f YH |
169 | { |
170 | const char *s, *tok = NULL; | |
171 | u8 *d, *dc = NULL; | |
172 | u8 dbuf[16]; | |
173 | int ret = 0; | |
174 | int i; | |
175 | int state = IN6PTON_COLON_1_2 | IN6PTON_XDIGIT | IN6PTON_NULL; | |
176 | int w = 0; | |
177 | ||
178 | memset(dbuf, 0, sizeof(dbuf)); | |
179 | ||
180 | s = src; | |
181 | d = dbuf; | |
182 | if (srclen < 0) | |
183 | srclen = strlen(src); | |
184 | ||
1aaec67f YH |
185 | while (1) { |
186 | int c; | |
187 | ||
188 | c = xdigit2bin(srclen > 0 ? *s : '\0', delim); | |
189 | if (!(c & state)) | |
190 | goto out; | |
191 | if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) { | |
192 | /* process one 16-bit word */ | |
193 | if (!(state & IN6PTON_NULL)) { | |
194 | *d++ = (w >> 8) & 0xff; | |
195 | *d++ = w & 0xff; | |
196 | } | |
197 | w = 0; | |
198 | if (c & IN6PTON_DELIM) { | |
199 | /* We've processed last word */ | |
200 | break; | |
201 | } | |
202 | /* | |
203 | * COLON_1 => XDIGIT | |
204 | * COLON_2 => XDIGIT|DELIM | |
205 | * COLON_1_2 => COLON_2 | |
206 | */ | |
207 | switch (state & IN6PTON_COLON_MASK) { | |
208 | case IN6PTON_COLON_2: | |
209 | dc = d; | |
210 | state = IN6PTON_XDIGIT | IN6PTON_DELIM; | |
211 | if (dc - dbuf >= sizeof(dbuf)) | |
212 | state |= IN6PTON_NULL; | |
213 | break; | |
214 | case IN6PTON_COLON_1|IN6PTON_COLON_1_2: | |
215 | state = IN6PTON_XDIGIT | IN6PTON_COLON_2; | |
216 | break; | |
217 | case IN6PTON_COLON_1: | |
218 | state = IN6PTON_XDIGIT; | |
219 | break; | |
220 | case IN6PTON_COLON_1_2: | |
221 | state = IN6PTON_COLON_2; | |
222 | break; | |
223 | default: | |
224 | state = 0; | |
225 | } | |
226 | tok = s + 1; | |
227 | goto cont; | |
228 | } | |
229 | ||
230 | if (c & IN6PTON_DOT) { | |
231 | ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s); | |
232 | if (ret > 0) { | |
233 | d += 4; | |
234 | break; | |
235 | } | |
236 | goto out; | |
237 | } | |
238 | ||
239 | w = (w << 4) | (0xff & c); | |
240 | state = IN6PTON_COLON_1 | IN6PTON_DELIM; | |
241 | if (!(w & 0xf000)) { | |
242 | state |= IN6PTON_XDIGIT; | |
243 | } | |
244 | if (!dc && d + 2 < dbuf + sizeof(dbuf)) { | |
245 | state |= IN6PTON_COLON_1_2; | |
246 | state &= ~IN6PTON_DELIM; | |
247 | } | |
248 | if (d + 2 >= dbuf + sizeof(dbuf)) { | |
249 | state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2); | |
250 | } | |
251 | cont: | |
252 | if ((dc && d + 4 < dbuf + sizeof(dbuf)) || | |
253 | d + 4 == dbuf + sizeof(dbuf)) { | |
254 | state |= IN6PTON_DOT; | |
255 | } | |
256 | if (d >= dbuf + sizeof(dbuf)) { | |
257 | state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK); | |
258 | } | |
259 | s++; | |
260 | srclen--; | |
261 | } | |
262 | ||
263 | i = 15; d--; | |
264 | ||
265 | if (dc) { | |
266 | while(d >= dc) | |
267 | dst[i--] = *d--; | |
268 | while(i >= dc - dbuf) | |
269 | dst[i--] = 0; | |
270 | while(i >= 0) | |
271 | dst[i--] = *d--; | |
272 | } else | |
273 | memcpy(dst, dbuf, sizeof(dbuf)); | |
274 | ||
275 | ret = 1; | |
276 | out: | |
277 | if (end) | |
278 | *end = s; | |
279 | return ret; | |
280 | } | |
281 | ||
282 | EXPORT_SYMBOL(in6_pton); | |
a99a00cf PM |
283 | |
284 | void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb, | |
285 | __be32 from, __be32 to, int pseudohdr) | |
286 | { | |
287 | __be32 diff[] = { ~from, to }; | |
288 | if (skb->ip_summed != CHECKSUM_PARTIAL) { | |
289 | *sum = csum_fold(csum_partial(diff, sizeof(diff), | |
290 | ~csum_unfold(*sum))); | |
291 | if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr) | |
292 | skb->csum = ~csum_partial(diff, sizeof(diff), | |
293 | ~skb->csum); | |
294 | } else if (pseudohdr) | |
295 | *sum = ~csum_fold(csum_partial(diff, sizeof(diff), | |
296 | csum_unfold(*sum))); | |
297 | } | |
298 | EXPORT_SYMBOL(inet_proto_csum_replace4); |