blob: 72e0ebe964a08d03be218b8c17aa061818579f2f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Generic address resultion entity
3 *
4 * Authors:
5 * net_random Alan Cox
Steven Rostedt75b31c32006-09-27 22:55:39 -07006 * net_ratelimit Andi Kleen
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +09007 * in{4,6}_pton YOSHIFUJI Hideaki, Copyright (C)2006 USAGI/WIDE Project
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
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>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030020#include <linux/inet.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/mm.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030022#include <linux/net.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/string.h>
24#include <linux/types.h>
25#include <linux/random.h>
26#include <linux/percpu.h>
27#include <linux/init.h>
Johannes Berg14ae8562007-08-07 18:02:43 -070028#include <net/sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Matt Mackall5e43db72005-07-27 15:24:42 -070030#include <asm/byteorder.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/system.h>
32#include <asm/uaccess.h>
33
Eric Dumazet6dea6492007-03-08 22:36:37 -080034int net_msg_warn __read_mostly = 1;
Stephen Hemmingera2a316f2007-03-08 20:41:08 -080035EXPORT_SYMBOL(net_msg_warn);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Dave Young717115e2008-07-25 01:45:58 -070037DEFINE_RATELIMIT_STATE(net_ratelimit_state, 5 * HZ, 10);
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090038/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 * All net warning printk()s should be guarded by this function.
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090040 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070041int net_ratelimit(void)
42{
Dave Young717115e2008-07-25 01:45:58 -070043 return __ratelimit(&net_ratelimit_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044}
Linus Torvalds1da177e2005-04-16 15:20:36 -070045EXPORT_SYMBOL(net_ratelimit);
Matt Mackall5e43db72005-07-27 15:24:42 -070046
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
Alexey Dobriyana2167dc2006-01-06 13:24:54 -080053__be32 in_aton(const char *str)
Matt Mackall5e43db72005-07-27 15:24:42 -070054{
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;
Mitch Williams1e2e5652005-11-09 10:34:01 -080066 while (*str != '\0' && *str != '.' && *str != '\n')
Matt Mackall5e43db72005-07-27 15:24:42 -070067 {
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
80EXPORT_SYMBOL(in_aton);
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +090081
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
Patrick McHardy9a7c9332006-12-02 22:04:04 -080093static inline int xdigit2bin(char c, int delim)
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +090094{
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));
Patrick McHardy9a7c9332006-12-02 22:04:04 -0800107 if (delim == -1)
108 return IN6PTON_DELIM;
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900109 return IN6PTON_UNKNOWN;
110}
111
112int in4_pton(const char *src, int srclen,
113 u8 *dst,
Patrick McHardy9a7c9332006-12-02 22:04:04 -0800114 int delim, const char **end)
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900115{
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);
Jerome Borsboom83f03fa2007-05-29 12:59:54 -0700131 if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) {
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900132 goto out;
133 }
Jerome Borsboom83f03fa2007-05-29 12:59:54 -0700134 if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900135 if (w == 0)
136 goto out;
137 *d++ = w & 0xff;
138 w = 0;
139 i++;
Jerome Borsboom83f03fa2007-05-29 12:59:54 -0700140 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900141 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 }
151cont:
152 if (i >= 4)
153 goto out;
154 s++;
155 srclen--;
156 }
157 ret = 1;
158 memcpy(dst, dbuf, sizeof(dbuf));
159out:
160 if (end)
161 *end = s;
162 return ret;
163}
164
165EXPORT_SYMBOL(in4_pton);
166
167int in6_pton(const char *src, int srclen,
168 u8 *dst,
Patrick McHardy9a7c9332006-12-02 22:04:04 -0800169 int delim, const char **end)
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900170{
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
YOSHIFUJI Hideaki1aaec672006-06-25 23:54:55 +0900186 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 }
252cont:
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;
277out:
278 if (end)
279 *end = s;
280 return ret;
281}
282
283EXPORT_SYMBOL(in6_pton);
Patrick McHardya99a00c2007-11-30 01:14:30 +1100284
285void 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}
299EXPORT_SYMBOL(inet_proto_csum_replace4);