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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>
28
29#include <asm/byteorder.h>
30#include <asm/system.h>
31#include <asm/uaccess.h>
32
33int net_msg_warn __read_mostly = 1;
34EXPORT_SYMBOL(net_msg_warn);
35
36DEFINE_RATELIMIT_STATE(net_ratelimit_state, 5 * HZ, 10);
37
38
39
40int net_ratelimit(void)
41{
42 return __ratelimit(&net_ratelimit_state);
43}
44EXPORT_SYMBOL(net_ratelimit);
45
46
47
48
49
50
51
52__be32 in_aton(const char *str)
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;
65 while (*str != '\0' && *str != '.' && *str != '\n')
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
79EXPORT_SYMBOL(in_aton);
80
81#define IN6PTON_XDIGIT 0x00010000
82#define IN6PTON_DIGIT 0x00020000
83#define IN6PTON_COLON_MASK 0x00700000
84#define IN6PTON_COLON_1 0x00100000
85#define IN6PTON_COLON_2 0x00200000
86#define IN6PTON_COLON_1_2 0x00400000
87#define IN6PTON_DOT 0x00800000
88#define IN6PTON_DELIM 0x10000000
89#define IN6PTON_NULL 0x20000000
90#define IN6PTON_UNKNOWN 0x40000000
91
92static inline int xdigit2bin(char c, int delim)
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));
106 if (delim == -1)
107 return IN6PTON_DELIM;
108 return IN6PTON_UNKNOWN;
109}
110
111int in4_pton(const char *src, int srclen,
112 u8 *dst,
113 int delim, const char **end)
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);
130 if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) {
131 goto out;
132 }
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;
143 }
144 goto cont;
145 }
146 w = (w * 10) + c;
147 if ((w & 0xffff) > 255) {
148 goto out;
149 }
150cont:
151 if (i >= 4)
152 goto out;
153 s++;
154 srclen--;
155 }
156 ret = 1;
157 memcpy(dst, dbuf, sizeof(dbuf));
158out:
159 if (end)
160 *end = s;
161 return ret;
162}
163
164EXPORT_SYMBOL(in4_pton);
165
166int in6_pton(const char *src, int srclen,
167 u8 *dst,
168 int delim, const char **end)
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
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
193 if (!(state & IN6PTON_NULL)) {
194 *d++ = (w >> 8) & 0xff;
195 *d++ = w & 0xff;
196 }
197 w = 0;
198 if (c & IN6PTON_DELIM) {
199
200 break;
201 }
202
203
204
205
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 }
251cont:
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;
276out:
277 if (end)
278 *end = s;
279 return ret;
280}
281
282EXPORT_SYMBOL(in6_pton);
283
284void 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}
298EXPORT_SYMBOL(inet_proto_csum_replace4);
299
