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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/percpu.h>
26#include <linux/init.h>
27#include <linux/ratelimit.h>
28
29#include <net/sock.h>
30#include <net/net_ratelimit.h>
31
32#include <asm/byteorder.h>
33#include <asm/system.h>
34#include <asm/uaccess.h>
35
36int net_msg_warn __read_mostly = 1;
37EXPORT_SYMBOL(net_msg_warn);
38
39DEFINE_RATELIMIT_STATE(net_ratelimit_state, 5 * HZ, 10);
40/*
41 * All net warning printk()s should be guarded by this function.
42 */
43int net_ratelimit(void)
44{
45 return __ratelimit(&net_ratelimit_state);
46}
47EXPORT_SYMBOL(net_ratelimit);
48
49/*
50 * Convert an ASCII string to binary IP.
51 * This is outside of net/ipv4/ because various code that uses IP addresses
52 * is otherwise not dependent on the TCP/IP stack.
53 */
54
55__be32 in_aton(const char *str)
56{
57 unsigned long l;
58 unsigned int val;
59 int i;
60
61 l = 0;
62 for (i = 0; i < 4; i++)
63 {
64 l <<= 8;
65 if (*str != '\0')
66 {
67 val = 0;
68 while (*str != '\0' && *str != '.' && *str != '\n')
69 {
70 val *= 10;
71 val += *str - '0';
72 str++;
73 }
74 l |= val;
75 if (*str != '\0')
76 str++;
77 }
78 }
79 return htonl(l);
80}
81EXPORT_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
94static inline int xdigit2bin(char c, int delim)
95{
96 int val;
97
98 if (c == delim || c == '\0')
99 return IN6PTON_DELIM;
100 if (c == ':')
101 return IN6PTON_COLON_MASK;
102 if (c == '.')
103 return IN6PTON_DOT;
104
105 val = hex_to_bin(c);
106 if (val >= 0)
107 return val | IN6PTON_XDIGIT | (val < 10 ? IN6PTON_DIGIT : 0);
108
109 if (delim == -1)
110 return IN6PTON_DELIM;
111 return IN6PTON_UNKNOWN;
112}
113
114int in4_pton(const char *src, int srclen,
115 u8 *dst,
116 int delim, const char **end)
117{
118 const char *s;
119 u8 *d;
120 u8 dbuf[4];
121 int ret = 0;
122 int i;
123 int w = 0;
124
125 if (srclen < 0)
126 srclen = strlen(src);
127 s = src;
128 d = dbuf;
129 i = 0;
130 while(1) {
131 int c;
132 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
133 if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) {
134 goto out;
135 }
136 if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
137 if (w == 0)
138 goto out;
139 *d++ = w & 0xff;
140 w = 0;
141 i++;
142 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
143 if (i != 4)
144 goto out;
145 break;
146 }
147 goto cont;
148 }
149 w = (w * 10) + c;
150 if ((w & 0xffff) > 255) {
151 goto out;
152 }
153cont:
154 if (i >= 4)
155 goto out;
156 s++;
157 srclen--;
158 }
159 ret = 1;
160 memcpy(dst, dbuf, sizeof(dbuf));
161out:
162 if (end)
163 *end = s;
164 return ret;
165}
166EXPORT_SYMBOL(in4_pton);
167
168int 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 }
253cont:
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;
278out:
279 if (end)
280 *end = s;
281 return ret;
282}
283EXPORT_SYMBOL(in6_pton);
284
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);
300
301int mac_pton(const char *s, u8 *mac)
302{
303 int i;
304
305 /* XX:XX:XX:XX:XX:XX */
306 if (strlen(s) < 3 * ETH_ALEN - 1)
307 return 0;
308
309 /* Don't dirty result unless string is valid MAC. */
310 for (i = 0; i < ETH_ALEN; i++) {
311 if (!strchr("0123456789abcdefABCDEF", s[i * 3]))
312 return 0;
313 if (!strchr("0123456789abcdefABCDEF", s[i * 3 + 1]))
314 return 0;
315 if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':')
316 return 0;
317 }
318 for (i = 0; i < ETH_ALEN; i++) {
319 mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]);
320 }
321 return 1;
322}
323EXPORT_SYMBOL(mac_pton);
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/percpu.h>
26#include <linux/init.h>
27#include <linux/ratelimit.h>
28
29#include <net/sock.h>
30#include <net/net_ratelimit.h>
31
32#include <asm/byteorder.h>
33#include <asm/uaccess.h>
34
35int net_msg_warn __read_mostly = 1;
36EXPORT_SYMBOL(net_msg_warn);
37
38DEFINE_RATELIMIT_STATE(net_ratelimit_state, 5 * HZ, 10);
39/*
40 * All net warning printk()s should be guarded by this function.
41 */
42int net_ratelimit(void)
43{
44 return __ratelimit(&net_ratelimit_state);
45}
46EXPORT_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 l <<= 8;
63 if (*str != '\0') {
64 val = 0;
65 while (*str != '\0' && *str != '.' && *str != '\n') {
66 val *= 10;
67 val += *str - '0';
68 str++;
69 }
70 l |= val;
71 if (*str != '\0')
72 str++;
73 }
74 }
75 return htonl(l);
76}
77EXPORT_SYMBOL(in_aton);
78
79#define IN6PTON_XDIGIT 0x00010000
80#define IN6PTON_DIGIT 0x00020000
81#define IN6PTON_COLON_MASK 0x00700000
82#define IN6PTON_COLON_1 0x00100000 /* single : requested */
83#define IN6PTON_COLON_2 0x00200000 /* second : requested */
84#define IN6PTON_COLON_1_2 0x00400000 /* :: requested */
85#define IN6PTON_DOT 0x00800000 /* . */
86#define IN6PTON_DELIM 0x10000000
87#define IN6PTON_NULL 0x20000000 /* first/tail */
88#define IN6PTON_UNKNOWN 0x40000000
89
90static inline int xdigit2bin(char c, int delim)
91{
92 int val;
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
101 val = hex_to_bin(c);
102 if (val >= 0)
103 return val | IN6PTON_XDIGIT | (val < 10 ? IN6PTON_DIGIT : 0);
104
105 if (delim == -1)
106 return IN6PTON_DELIM;
107 return IN6PTON_UNKNOWN;
108}
109
110int in4_pton(const char *src, int srclen,
111 u8 *dst,
112 int delim, const char **end)
113{
114 const char *s;
115 u8 *d;
116 u8 dbuf[4];
117 int ret = 0;
118 int i;
119 int w = 0;
120
121 if (srclen < 0)
122 srclen = strlen(src);
123 s = src;
124 d = dbuf;
125 i = 0;
126 while(1) {
127 int c;
128 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
129 if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) {
130 goto out;
131 }
132 if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
133 if (w == 0)
134 goto out;
135 *d++ = w & 0xff;
136 w = 0;
137 i++;
138 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
139 if (i != 4)
140 goto out;
141 break;
142 }
143 goto cont;
144 }
145 w = (w * 10) + c;
146 if ((w & 0xffff) > 255) {
147 goto out;
148 }
149cont:
150 if (i >= 4)
151 goto out;
152 s++;
153 srclen--;
154 }
155 ret = 1;
156 memcpy(dst, dbuf, sizeof(dbuf));
157out:
158 if (end)
159 *end = s;
160 return ret;
161}
162EXPORT_SYMBOL(in4_pton);
163
164int in6_pton(const char *src, int srclen,
165 u8 *dst,
166 int delim, const char **end)
167{
168 const char *s, *tok = NULL;
169 u8 *d, *dc = NULL;
170 u8 dbuf[16];
171 int ret = 0;
172 int i;
173 int state = IN6PTON_COLON_1_2 | IN6PTON_XDIGIT | IN6PTON_NULL;
174 int w = 0;
175
176 memset(dbuf, 0, sizeof(dbuf));
177
178 s = src;
179 d = dbuf;
180 if (srclen < 0)
181 srclen = strlen(src);
182
183 while (1) {
184 int c;
185
186 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
187 if (!(c & state))
188 goto out;
189 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
190 /* process one 16-bit word */
191 if (!(state & IN6PTON_NULL)) {
192 *d++ = (w >> 8) & 0xff;
193 *d++ = w & 0xff;
194 }
195 w = 0;
196 if (c & IN6PTON_DELIM) {
197 /* We've processed last word */
198 break;
199 }
200 /*
201 * COLON_1 => XDIGIT
202 * COLON_2 => XDIGIT|DELIM
203 * COLON_1_2 => COLON_2
204 */
205 switch (state & IN6PTON_COLON_MASK) {
206 case IN6PTON_COLON_2:
207 dc = d;
208 state = IN6PTON_XDIGIT | IN6PTON_DELIM;
209 if (dc - dbuf >= sizeof(dbuf))
210 state |= IN6PTON_NULL;
211 break;
212 case IN6PTON_COLON_1|IN6PTON_COLON_1_2:
213 state = IN6PTON_XDIGIT | IN6PTON_COLON_2;
214 break;
215 case IN6PTON_COLON_1:
216 state = IN6PTON_XDIGIT;
217 break;
218 case IN6PTON_COLON_1_2:
219 state = IN6PTON_COLON_2;
220 break;
221 default:
222 state = 0;
223 }
224 tok = s + 1;
225 goto cont;
226 }
227
228 if (c & IN6PTON_DOT) {
229 ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s);
230 if (ret > 0) {
231 d += 4;
232 break;
233 }
234 goto out;
235 }
236
237 w = (w << 4) | (0xff & c);
238 state = IN6PTON_COLON_1 | IN6PTON_DELIM;
239 if (!(w & 0xf000)) {
240 state |= IN6PTON_XDIGIT;
241 }
242 if (!dc && d + 2 < dbuf + sizeof(dbuf)) {
243 state |= IN6PTON_COLON_1_2;
244 state &= ~IN6PTON_DELIM;
245 }
246 if (d + 2 >= dbuf + sizeof(dbuf)) {
247 state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2);
248 }
249cont:
250 if ((dc && d + 4 < dbuf + sizeof(dbuf)) ||
251 d + 4 == dbuf + sizeof(dbuf)) {
252 state |= IN6PTON_DOT;
253 }
254 if (d >= dbuf + sizeof(dbuf)) {
255 state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK);
256 }
257 s++;
258 srclen--;
259 }
260
261 i = 15; d--;
262
263 if (dc) {
264 while(d >= dc)
265 dst[i--] = *d--;
266 while(i >= dc - dbuf)
267 dst[i--] = 0;
268 while(i >= 0)
269 dst[i--] = *d--;
270 } else
271 memcpy(dst, dbuf, sizeof(dbuf));
272
273 ret = 1;
274out:
275 if (end)
276 *end = s;
277 return ret;
278}
279EXPORT_SYMBOL(in6_pton);
280
281void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
282 __be32 from, __be32 to, int pseudohdr)
283{
284 __be32 diff[] = { ~from, to };
285 if (skb->ip_summed != CHECKSUM_PARTIAL) {
286 *sum = csum_fold(csum_partial(diff, sizeof(diff),
287 ~csum_unfold(*sum)));
288 if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
289 skb->csum = ~csum_partial(diff, sizeof(diff),
290 ~skb->csum);
291 } else if (pseudohdr)
292 *sum = ~csum_fold(csum_partial(diff, sizeof(diff),
293 csum_unfold(*sum)));
294}
295EXPORT_SYMBOL(inet_proto_csum_replace4);
296
297int mac_pton(const char *s, u8 *mac)
298{
299 int i;
300
301 /* XX:XX:XX:XX:XX:XX */
302 if (strlen(s) < 3 * ETH_ALEN - 1)
303 return 0;
304
305 /* Don't dirty result unless string is valid MAC. */
306 for (i = 0; i < ETH_ALEN; i++) {
307 if (!strchr("0123456789abcdefABCDEF", s[i * 3]))
308 return 0;
309 if (!strchr("0123456789abcdefABCDEF", s[i * 3 + 1]))
310 return 0;
311 if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':')
312 return 0;
313 }
314 for (i = 0; i < ETH_ALEN; i++) {
315 mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]);
316 }
317 return 1;
318}
319EXPORT_SYMBOL(mac_pton);