1 /*
2 * Generic address resultion entity
3 *
4 * Authors:
5 * net_random Alan Cox
6 * net_ratelimit Andi Kleen
7 * in{4,6}_pton YOSHIFUJI Hideaki, Copyright (C)2006 USAGI/WIDE Project
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>
20 #include <linux/inet.h>
21 #include <linux/mm.h>
22 #include <linux/net.h>
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 #include <net/sock.h>
29
30 #include <asm/byteorder.h>
31 #include <asm/system.h>
32 #include <asm/uaccess.h>
33
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;
37 EXPORT_SYMBOL(net_msg_warn);
38
39 /*
40 * All net warning printk()s should be guarded by this function.
41 */
42 int net_ratelimit(void)
43 {
44 return __printk_ratelimit(net_msg_cost, net_msg_burst);
45 }
46 EXPORT_SYMBOL(net_ratelimit);
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
54 __be32 in_aton(const char *str)
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;
67 while (*str != '\0' && *str != '.' && *str != '\n')
68 {
69 val *= 10;
70 val += *str - '';
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);
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
94 static inline int xdigit2bin(char c, int delim)
95 {
96 if (c == delim || c == '\0')
97 return IN6PTON_DELIM;
98 if (c == ':')
99 return IN6PTON_COLON_MASK;
100 if (c == '.')
101 return IN6PTON_DOT;
102 if (c >= '' && c <= '9')
103 return (IN6PTON_XDIGIT | IN6PTON_DIGIT| (c - ''));
104 if (c >= 'a' && c <= 'f')
105 return (IN6PTON_XDIGIT | (c - 'a' + 10));
106 if (c >= 'A' && c <= 'F')
107 return (IN6PTON_XDIGIT | (c - 'A' + 10));
108 if (delim == -1)
109 return IN6PTON_DELIM;
110 return IN6PTON_UNKNOWN;
111 }
112
113 int in4_pton(const char *src, int srclen,
114 u8 *dst,
115 int delim, const char **end)
116 {
117 const char *s;
118 u8 *d;
119 u8 dbuf[4];
120 int ret = 0;
121 int i;
122 int w = 0;
123
124 if (srclen < 0)
125 srclen = strlen(src);
126 s = src;
127 d = dbuf;
128 i = 0;
129 while(1) {
130 int c;
131 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
132 if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) {
133 goto out;
134 }
135 if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
136 if (w == 0)
137 goto out;
138 *d++ = w & 0xff;
139 w = 0;
140 i++;
141 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
142 if (i != 4)
143 goto out;
144 break;
145 }
146 goto cont;
147 }
148 w = (w * 10) + c;
149 if ((w & 0xffff) > 255) {
150 goto out;
151 }
152 cont:
153 if (i >= 4)
154 goto out;
155 s++;
156 srclen--;
157 }
158 ret = 1;
159 memcpy(dst, dbuf, sizeof(dbuf));
160 out:
161 if (end)
162 *end = s;
163 return ret;
164 }
165
166 EXPORT_SYMBOL(in4_pton);
167
168 int in6_pton(const char *src, int srclen,
169 u8 *dst,
170 int delim, const char **end)
171 {
172 const char *s, *tok = NULL;
173 u8 *d, *dc = NULL;
174 u8 dbuf[16];
175 int ret = 0;
176 int i;
177 int state = IN6PTON_COLON_1_2 | IN6PTON_XDIGIT | IN6PTON_NULL;
178 int w = 0;
179
180 memset(dbuf, 0, sizeof(dbuf));
181
182 s = src;
183 d = dbuf;
184 if (srclen < 0)
185 srclen = strlen(src);
186
187 while (1) {
188 int c;
189
190 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
191 if (!(c & state))
192 goto out;
193 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
194 /* process one 16-bit word */
195 if (!(state & IN6PTON_NULL)) {
196 *d++ = (w >> 8) & 0xff;
197 *d++ = w & 0xff;
198 }
199 w = 0;
200 if (c & IN6PTON_DELIM) {
201 /* We've processed last word */
202 break;
203 }
204 /*
205 * COLON_1 => XDIGIT
206 * COLON_2 => XDIGIT|DELIM
207 * COLON_1_2 => COLON_2
208 */
209 switch (state & IN6PTON_COLON_MASK) {
210 case IN6PTON_COLON_2:
211 dc = d;
212 state = IN6PTON_XDIGIT | IN6PTON_DELIM;
213 if (dc - dbuf >= sizeof(dbuf))
214 state |= IN6PTON_NULL;
215 break;
216 case IN6PTON_COLON_1|IN6PTON_COLON_1_2:
217 state = IN6PTON_XDIGIT | IN6PTON_COLON_2;
218 break;
219 case IN6PTON_COLON_1:
220 state = IN6PTON_XDIGIT;
221 break;
222 case IN6PTON_COLON_1_2:
223 state = IN6PTON_COLON_2;
224 break;
225 default:
226 state = 0;
227 }
228 tok = s + 1;
229 goto cont;
230 }
231
232 if (c & IN6PTON_DOT) {
233 ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s);
234 if (ret > 0) {
235 d += 4;
236 break;
237 }
238 goto out;
239 }
240
241 w = (w << 4) | (0xff & c);
242 state = IN6PTON_COLON_1 | IN6PTON_DELIM;
243 if (!(w & 0xf000)) {
244 state |= IN6PTON_XDIGIT;
245 }
246 if (!dc && d + 2 < dbuf + sizeof(dbuf)) {
247 state |= IN6PTON_COLON_1_2;
248 state &= ~IN6PTON_DELIM;
249 }
250 if (d + 2 >= dbuf + sizeof(dbuf)) {
251 state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2);
252 }
253 cont:
254 if ((dc && d + 4 < dbuf + sizeof(dbuf)) ||
255 d + 4 == dbuf + sizeof(dbuf)) {
256 state |= IN6PTON_DOT;
257 }
258 if (d >= dbuf + sizeof(dbuf)) {
259 state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK);
260 }
261 s++;
262 srclen--;
263 }
264
265 i = 15; d--;
266
267 if (dc) {
268 while(d >= dc)
269 dst[i--] = *d--;
270 while(i >= dc - dbuf)
271 dst[i--] = 0;
272 while(i >= 0)
273 dst[i--] = *d--;
274 } else
275 memcpy(dst, dbuf, sizeof(dbuf));
276
277 ret = 1;
278 out:
279 if (end)
280 *end = s;
281 return ret;
282 }
283
284 EXPORT_SYMBOL(in6_pton);
285
286 void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
287 __be32 from, __be32 to, int pseudohdr)
288 {
289 __be32 diff[] = { ~from, to };
290 if (skb->ip_summed != CHECKSUM_PARTIAL) {
291 *sum = csum_fold(csum_partial(diff, sizeof(diff),
292 ~csum_unfold(*sum)));
293 if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
294 skb->csum = ~csum_partial(diff, sizeof(diff),
295 ~skb->csum);
296 } else if (pseudohdr)
297 *sum = ~csum_fold(csum_partial(diff, sizeof(diff),
298 csum_unfold(*sum)));
299 }
300 EXPORT_SYMBOL(inet_proto_csum_replace4);
301
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