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 | 34 | int net_msg_warn __read_mostly = 1; |
a2a316fd | 35 | EXPORT_SYMBOL(net_msg_warn); |
1da177e4 | 36 | |
717115e1 | 37 | DEFINE_RATELIMIT_STATE(net_ratelimit_state, 5 * HZ, 10); |
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 | { | |
717115e1 | 43 | return __ratelimit(&net_ratelimit_state); |
1da177e4 | 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 xdigit2bin(char c, int delim) |
1aaec67f YH |
94 | { |
95 | if (c == delim || c == '\0') | |
96 | return IN6PTON_DELIM; | |
97 | if (c == ':') | |
98 | return IN6PTON_COLON_MASK; | |
99 | if (c == '.') | |
100 | return IN6PTON_DOT; | |
101 | if (c >= '0' && c <= '9') | |
102 | return (IN6PTON_XDIGIT | IN6PTON_DIGIT| (c - '0')); | |
103 | if (c >= 'a' && c <= 'f') | |
104 | return (IN6PTON_XDIGIT | (c - 'a' + 10)); | |
105 | if (c >= 'A' && c <= 'F') | |
106 | return (IN6PTON_XDIGIT | (c - 'A' + 10)); | |
9a7c9337 PM |
107 | if (delim == -1) |
108 | return IN6PTON_DELIM; | |
1aaec67f YH |
109 | return IN6PTON_UNKNOWN; |
110 | } | |
111 | ||
112 | int in4_pton(const char *src, int srclen, | |
113 | u8 *dst, | |
9a7c9337 | 114 | int delim, const char **end) |
1aaec67f YH |
115 | { |
116 | const char *s; | |
117 | u8 *d; | |
118 | u8 dbuf[4]; | |
119 | int ret = 0; | |
120 | int i; | |
121 | int w = 0; | |
122 | ||
123 | if (srclen < 0) | |
124 | srclen = strlen(src); | |
125 | s = src; | |
126 | d = dbuf; | |
127 | i = 0; | |
128 | while(1) { | |
129 | int c; | |
130 | c = xdigit2bin(srclen > 0 ? *s : '\0', delim); | |
83f03fa5 | 131 | if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) { |
1aaec67f YH |
132 | goto out; |
133 | } | |
83f03fa5 | 134 | if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) { |
1aaec67f YH |
135 | if (w == 0) |
136 | goto out; | |
137 | *d++ = w & 0xff; | |
138 | w = 0; | |
139 | i++; | |
83f03fa5 | 140 | if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) { |
1aaec67f YH |
141 | if (i != 4) |
142 | goto out; | |
143 | break; | |
144 | } | |
145 | goto cont; | |
146 | } | |
147 | w = (w * 10) + c; | |
148 | if ((w & 0xffff) > 255) { | |
149 | goto out; | |
150 | } | |
151 | cont: | |
152 | if (i >= 4) | |
153 | goto out; | |
154 | s++; | |
155 | srclen--; | |
156 | } | |
157 | ret = 1; | |
158 | memcpy(dst, dbuf, sizeof(dbuf)); | |
159 | out: | |
160 | if (end) | |
161 | *end = s; | |
162 | return ret; | |
163 | } | |
164 | ||
165 | EXPORT_SYMBOL(in4_pton); | |
166 | ||
167 | int in6_pton(const char *src, int srclen, | |
168 | u8 *dst, | |
9a7c9337 | 169 | int delim, const char **end) |
1aaec67f YH |
170 | { |
171 | const char *s, *tok = NULL; | |
172 | u8 *d, *dc = NULL; | |
173 | u8 dbuf[16]; | |
174 | int ret = 0; | |
175 | int i; | |
176 | int state = IN6PTON_COLON_1_2 | IN6PTON_XDIGIT | IN6PTON_NULL; | |
177 | int w = 0; | |
178 | ||
179 | memset(dbuf, 0, sizeof(dbuf)); | |
180 | ||
181 | s = src; | |
182 | d = dbuf; | |
183 | if (srclen < 0) | |
184 | srclen = strlen(src); | |
185 | ||
1aaec67f YH |
186 | while (1) { |
187 | int c; | |
188 | ||
189 | c = xdigit2bin(srclen > 0 ? *s : '\0', delim); | |
190 | if (!(c & state)) | |
191 | goto out; | |
192 | if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) { | |
193 | /* process one 16-bit word */ | |
194 | if (!(state & IN6PTON_NULL)) { | |
195 | *d++ = (w >> 8) & 0xff; | |
196 | *d++ = w & 0xff; | |
197 | } | |
198 | w = 0; | |
199 | if (c & IN6PTON_DELIM) { | |
200 | /* We've processed last word */ | |
201 | break; | |
202 | } | |
203 | /* | |
204 | * COLON_1 => XDIGIT | |
205 | * COLON_2 => XDIGIT|DELIM | |
206 | * COLON_1_2 => COLON_2 | |
207 | */ | |
208 | switch (state & IN6PTON_COLON_MASK) { | |
209 | case IN6PTON_COLON_2: | |
210 | dc = d; | |
211 | state = IN6PTON_XDIGIT | IN6PTON_DELIM; | |
212 | if (dc - dbuf >= sizeof(dbuf)) | |
213 | state |= IN6PTON_NULL; | |
214 | break; | |
215 | case IN6PTON_COLON_1|IN6PTON_COLON_1_2: | |
216 | state = IN6PTON_XDIGIT | IN6PTON_COLON_2; | |
217 | break; | |
218 | case IN6PTON_COLON_1: | |
219 | state = IN6PTON_XDIGIT; | |
220 | break; | |
221 | case IN6PTON_COLON_1_2: | |
222 | state = IN6PTON_COLON_2; | |
223 | break; | |
224 | default: | |
225 | state = 0; | |
226 | } | |
227 | tok = s + 1; | |
228 | goto cont; | |
229 | } | |
230 | ||
231 | if (c & IN6PTON_DOT) { | |
232 | ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s); | |
233 | if (ret > 0) { | |
234 | d += 4; | |
235 | break; | |
236 | } | |
237 | goto out; | |
238 | } | |
239 | ||
240 | w = (w << 4) | (0xff & c); | |
241 | state = IN6PTON_COLON_1 | IN6PTON_DELIM; | |
242 | if (!(w & 0xf000)) { | |
243 | state |= IN6PTON_XDIGIT; | |
244 | } | |
245 | if (!dc && d + 2 < dbuf + sizeof(dbuf)) { | |
246 | state |= IN6PTON_COLON_1_2; | |
247 | state &= ~IN6PTON_DELIM; | |
248 | } | |
249 | if (d + 2 >= dbuf + sizeof(dbuf)) { | |
250 | state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2); | |
251 | } | |
252 | cont: | |
253 | if ((dc && d + 4 < dbuf + sizeof(dbuf)) || | |
254 | d + 4 == dbuf + sizeof(dbuf)) { | |
255 | state |= IN6PTON_DOT; | |
256 | } | |
257 | if (d >= dbuf + sizeof(dbuf)) { | |
258 | state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK); | |
259 | } | |
260 | s++; | |
261 | srclen--; | |
262 | } | |
263 | ||
264 | i = 15; d--; | |
265 | ||
266 | if (dc) { | |
267 | while(d >= dc) | |
268 | dst[i--] = *d--; | |
269 | while(i >= dc - dbuf) | |
270 | dst[i--] = 0; | |
271 | while(i >= 0) | |
272 | dst[i--] = *d--; | |
273 | } else | |
274 | memcpy(dst, dbuf, sizeof(dbuf)); | |
275 | ||
276 | ret = 1; | |
277 | out: | |
278 | if (end) | |
279 | *end = s; | |
280 | return ret; | |
281 | } | |
282 | ||
283 | EXPORT_SYMBOL(in6_pton); | |
a99a00cf PM |
284 | |
285 | void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb, | |
286 | __be32 from, __be32 to, int pseudohdr) | |
287 | { | |
288 | __be32 diff[] = { ~from, to }; | |
289 | if (skb->ip_summed != CHECKSUM_PARTIAL) { | |
290 | *sum = csum_fold(csum_partial(diff, sizeof(diff), | |
291 | ~csum_unfold(*sum))); | |
292 | if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr) | |
293 | skb->csum = ~csum_partial(diff, sizeof(diff), | |
294 | ~skb->csum); | |
295 | } else if (pseudohdr) | |
296 | *sum = ~csum_fold(csum_partial(diff, sizeof(diff), | |
297 | csum_unfold(*sum))); | |
298 | } | |
299 | EXPORT_SYMBOL(inet_proto_csum_replace4); |