usb: added usb-host functionality for MSM devices amd Leo config file
[htc-linux.git] / net / core / utils.c
blob83221aee708488fdf52fc9c8a79ace483d96687d
1 /*
2 * Generic address resultion entity
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
9 * Created by Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
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.
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/percpu.h>
26 #include <linux/init.h>
27 #include <net/sock.h>
29 #include <asm/byteorder.h>
30 #include <asm/system.h>
31 #include <asm/uaccess.h>
33 int net_msg_warn __read_mostly = 1;
34 EXPORT_SYMBOL(net_msg_warn);
36 DEFINE_RATELIMIT_STATE(net_ratelimit_state, 5 * HZ, 10);
38 * All net warning printk()s should be guarded by this function.
40 int net_ratelimit(void)
42 return __ratelimit(&net_ratelimit_state);
44 EXPORT_SYMBOL(net_ratelimit);
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.
52 __be32 in_aton(const char *str)
54 unsigned long l;
55 unsigned int val;
56 int i;
58 l = 0;
59 for (i = 0; i < 4; i++)
61 l <<= 8;
62 if (*str != '\0')
64 val = 0;
65 while (*str != '\0' && *str != '.' && *str != '\n')
67 val *= 10;
68 val += *str - '0';
69 str++;
71 l |= val;
72 if (*str != '\0')
73 str++;
76 return(htonl(l));
79 EXPORT_SYMBOL(in_aton);
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
92 static inline int xdigit2bin(char c, int delim)
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));
106 if (delim == -1)
107 return IN6PTON_DELIM;
108 return IN6PTON_UNKNOWN;
111 int in4_pton(const char *src, int srclen,
112 u8 *dst,
113 int delim, const char **end)
115 const char *s;
116 u8 *d;
117 u8 dbuf[4];
118 int ret = 0;
119 int i;
120 int w = 0;
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);
130 if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) {
131 goto out;
133 if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
134 if (w == 0)
135 goto out;
136 *d++ = w & 0xff;
137 w = 0;
138 i++;
139 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
140 if (i != 4)
141 goto out;
142 break;
144 goto cont;
146 w = (w * 10) + c;
147 if ((w & 0xffff) > 255) {
148 goto out;
150 cont:
151 if (i >= 4)
152 goto out;
153 s++;
154 srclen--;
156 ret = 1;
157 memcpy(dst, dbuf, sizeof(dbuf));
158 out:
159 if (end)
160 *end = s;
161 return ret;
164 EXPORT_SYMBOL(in4_pton);
166 int in6_pton(const char *src, int srclen,
167 u8 *dst,
168 int delim, const char **end)
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;
178 memset(dbuf, 0, sizeof(dbuf));
180 s = src;
181 d = dbuf;
182 if (srclen < 0)
183 srclen = strlen(src);
185 while (1) {
186 int c;
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;
197 w = 0;
198 if (c & IN6PTON_DELIM) {
199 /* We've processed last word */
200 break;
203 * COLON_1 => XDIGIT
204 * COLON_2 => XDIGIT|DELIM
205 * COLON_1_2 => COLON_2
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;
226 tok = s + 1;
227 goto cont;
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;
236 goto out;
239 w = (w << 4) | (0xff & c);
240 state = IN6PTON_COLON_1 | IN6PTON_DELIM;
241 if (!(w & 0xf000)) {
242 state |= IN6PTON_XDIGIT;
244 if (!dc && d + 2 < dbuf + sizeof(dbuf)) {
245 state |= IN6PTON_COLON_1_2;
246 state &= ~IN6PTON_DELIM;
248 if (d + 2 >= dbuf + sizeof(dbuf)) {
249 state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2);
251 cont:
252 if ((dc && d + 4 < dbuf + sizeof(dbuf)) ||
253 d + 4 == dbuf + sizeof(dbuf)) {
254 state |= IN6PTON_DOT;
256 if (d >= dbuf + sizeof(dbuf)) {
257 state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK);
259 s++;
260 srclen--;
263 i = 15; d--;
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));
275 ret = 1;
276 out:
277 if (end)
278 *end = s;
279 return ret;
282 EXPORT_SYMBOL(in6_pton);
284 void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
285 __be32 from, __be32 to, int pseudohdr)
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)));
298 EXPORT_SYMBOL(inet_proto_csum_replace4);