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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/ctype.h>
21#include <linux/inet.h>
22#include <linux/mm.h>
23#include <linux/net.h>
24#include <linux/string.h>
25#include <linux/types.h>
26#include <linux/percpu.h>
27#include <linux/init.h>
28#include <linux/ratelimit.h>
29
30#include <net/sock.h>
31#include <net/net_ratelimit.h>
32
33#include <asm/byteorder.h>
34#include <linux/uaccess.h>
35
36DEFINE_RATELIMIT_STATE(net_ratelimit_state, 5 * HZ, 10);
37/*
38 * All net warning printk()s should be guarded by this function.
39 */
40int net_ratelimit(void)
41{
42 return __ratelimit(&net_ratelimit_state);
43}
44EXPORT_SYMBOL(net_ratelimit);
45
46/*
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.
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 l <<= 8;
61 if (*str != '\0') {
62 val = 0;
63 while (*str != '\0' && *str != '.' && *str != '\n') {
64 val *= 10;
65 val += *str - '0';
66 str++;
67 }
68 l |= val;
69 if (*str != '\0')
70 str++;
71 }
72 }
73 return htonl(l);
74}
75EXPORT_SYMBOL(in_aton);
76
77#define IN6PTON_XDIGIT 0x00010000
78#define IN6PTON_DIGIT 0x00020000
79#define IN6PTON_COLON_MASK 0x00700000
80#define IN6PTON_COLON_1 0x00100000 /* single : requested */
81#define IN6PTON_COLON_2 0x00200000 /* second : requested */
82#define IN6PTON_COLON_1_2 0x00400000 /* :: requested */
83#define IN6PTON_DOT 0x00800000 /* . */
84#define IN6PTON_DELIM 0x10000000
85#define IN6PTON_NULL 0x20000000 /* first/tail */
86#define IN6PTON_UNKNOWN 0x40000000
87
88static inline int xdigit2bin(char c, int delim)
89{
90 int val;
91
92 if (c == delim || c == '\0')
93 return IN6PTON_DELIM;
94 if (c == ':')
95 return IN6PTON_COLON_MASK;
96 if (c == '.')
97 return IN6PTON_DOT;
98
99 val = hex_to_bin(c);
100 if (val >= 0)
101 return val | IN6PTON_XDIGIT | (val < 10 ? IN6PTON_DIGIT : 0);
102
103 if (delim == -1)
104 return IN6PTON_DELIM;
105 return IN6PTON_UNKNOWN;
106}
107
108/**
109 * in4_pton - convert an IPv4 address from literal to binary representation
110 * @src: the start of the IPv4 address string
111 * @srclen: the length of the string, -1 means strlen(src)
112 * @dst: the binary (u8[4] array) representation of the IPv4 address
113 * @delim: the delimiter of the IPv4 address in @src, -1 means no delimiter
114 * @end: A pointer to the end of the parsed string will be placed here
115 *
116 * Return one on success, return zero when any error occurs
117 * and @end will point to the end of the parsed string.
118 *
119 */
120int in4_pton(const char *src, int srclen,
121 u8 *dst,
122 int delim, const char **end)
123{
124 const char *s;
125 u8 *d;
126 u8 dbuf[4];
127 int ret = 0;
128 int i;
129 int w = 0;
130
131 if (srclen < 0)
132 srclen = strlen(src);
133 s = src;
134 d = dbuf;
135 i = 0;
136 while (1) {
137 int c;
138 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
139 if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) {
140 goto out;
141 }
142 if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
143 if (w == 0)
144 goto out;
145 *d++ = w & 0xff;
146 w = 0;
147 i++;
148 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
149 if (i != 4)
150 goto out;
151 break;
152 }
153 goto cont;
154 }
155 w = (w * 10) + c;
156 if ((w & 0xffff) > 255) {
157 goto out;
158 }
159cont:
160 if (i >= 4)
161 goto out;
162 s++;
163 srclen--;
164 }
165 ret = 1;
166 memcpy(dst, dbuf, sizeof(dbuf));
167out:
168 if (end)
169 *end = s;
170 return ret;
171}
172EXPORT_SYMBOL(in4_pton);
173
174/**
175 * in6_pton - convert an IPv6 address from literal to binary representation
176 * @src: the start of the IPv6 address string
177 * @srclen: the length of the string, -1 means strlen(src)
178 * @dst: the binary (u8[16] array) representation of the IPv6 address
179 * @delim: the delimiter of the IPv6 address in @src, -1 means no delimiter
180 * @end: A pointer to the end of the parsed string will be placed here
181 *
182 * Return one on success, return zero when any error occurs
183 * and @end will point to the end of the parsed string.
184 *
185 */
186int in6_pton(const char *src, int srclen,
187 u8 *dst,
188 int delim, const char **end)
189{
190 const char *s, *tok = NULL;
191 u8 *d, *dc = NULL;
192 u8 dbuf[16];
193 int ret = 0;
194 int i;
195 int state = IN6PTON_COLON_1_2 | IN6PTON_XDIGIT | IN6PTON_NULL;
196 int w = 0;
197
198 memset(dbuf, 0, sizeof(dbuf));
199
200 s = src;
201 d = dbuf;
202 if (srclen < 0)
203 srclen = strlen(src);
204
205 while (1) {
206 int c;
207
208 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
209 if (!(c & state))
210 goto out;
211 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
212 /* process one 16-bit word */
213 if (!(state & IN6PTON_NULL)) {
214 *d++ = (w >> 8) & 0xff;
215 *d++ = w & 0xff;
216 }
217 w = 0;
218 if (c & IN6PTON_DELIM) {
219 /* We've processed last word */
220 break;
221 }
222 /*
223 * COLON_1 => XDIGIT
224 * COLON_2 => XDIGIT|DELIM
225 * COLON_1_2 => COLON_2
226 */
227 switch (state & IN6PTON_COLON_MASK) {
228 case IN6PTON_COLON_2:
229 dc = d;
230 state = IN6PTON_XDIGIT | IN6PTON_DELIM;
231 if (dc - dbuf >= sizeof(dbuf))
232 state |= IN6PTON_NULL;
233 break;
234 case IN6PTON_COLON_1|IN6PTON_COLON_1_2:
235 state = IN6PTON_XDIGIT | IN6PTON_COLON_2;
236 break;
237 case IN6PTON_COLON_1:
238 state = IN6PTON_XDIGIT;
239 break;
240 case IN6PTON_COLON_1_2:
241 state = IN6PTON_COLON_2;
242 break;
243 default:
244 state = 0;
245 }
246 tok = s + 1;
247 goto cont;
248 }
249
250 if (c & IN6PTON_DOT) {
251 ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s);
252 if (ret > 0) {
253 d += 4;
254 break;
255 }
256 goto out;
257 }
258
259 w = (w << 4) | (0xff & c);
260 state = IN6PTON_COLON_1 | IN6PTON_DELIM;
261 if (!(w & 0xf000)) {
262 state |= IN6PTON_XDIGIT;
263 }
264 if (!dc && d + 2 < dbuf + sizeof(dbuf)) {
265 state |= IN6PTON_COLON_1_2;
266 state &= ~IN6PTON_DELIM;
267 }
268 if (d + 2 >= dbuf + sizeof(dbuf)) {
269 state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2);
270 }
271cont:
272 if ((dc && d + 4 < dbuf + sizeof(dbuf)) ||
273 d + 4 == dbuf + sizeof(dbuf)) {
274 state |= IN6PTON_DOT;
275 }
276 if (d >= dbuf + sizeof(dbuf)) {
277 state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK);
278 }
279 s++;
280 srclen--;
281 }
282
283 i = 15; d--;
284
285 if (dc) {
286 while (d >= dc)
287 dst[i--] = *d--;
288 while (i >= dc - dbuf)
289 dst[i--] = 0;
290 while (i >= 0)
291 dst[i--] = *d--;
292 } else
293 memcpy(dst, dbuf, sizeof(dbuf));
294
295 ret = 1;
296out:
297 if (end)
298 *end = s;
299 return ret;
300}
301EXPORT_SYMBOL(in6_pton);
302
303void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
304 __be32 from, __be32 to, bool pseudohdr)
305{
306 if (skb->ip_summed != CHECKSUM_PARTIAL) {
307 csum_replace4(sum, from, to);
308 if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
309 skb->csum = ~csum_add(csum_sub(~(skb->csum),
310 (__force __wsum)from),
311 (__force __wsum)to);
312 } else if (pseudohdr)
313 *sum = ~csum_fold(csum_add(csum_sub(csum_unfold(*sum),
314 (__force __wsum)from),
315 (__force __wsum)to));
316}
317EXPORT_SYMBOL(inet_proto_csum_replace4);
318
319void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,
320 const __be32 *from, const __be32 *to,
321 bool pseudohdr)
322{
323 __be32 diff[] = {
324 ~from[0], ~from[1], ~from[2], ~from[3],
325 to[0], to[1], to[2], to[3],
326 };
327 if (skb->ip_summed != CHECKSUM_PARTIAL) {
328 *sum = csum_fold(csum_partial(diff, sizeof(diff),
329 ~csum_unfold(*sum)));
330 if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
331 skb->csum = ~csum_partial(diff, sizeof(diff),
332 ~skb->csum);
333 } else if (pseudohdr)
334 *sum = ~csum_fold(csum_partial(diff, sizeof(diff),
335 csum_unfold(*sum)));
336}
337EXPORT_SYMBOL(inet_proto_csum_replace16);
338
339void inet_proto_csum_replace_by_diff(__sum16 *sum, struct sk_buff *skb,
340 __wsum diff, bool pseudohdr)
341{
342 if (skb->ip_summed != CHECKSUM_PARTIAL) {
343 *sum = csum_fold(csum_add(diff, ~csum_unfold(*sum)));
344 if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
345 skb->csum = ~csum_add(diff, ~skb->csum);
346 } else if (pseudohdr) {
347 *sum = ~csum_fold(csum_add(diff, csum_unfold(*sum)));
348 }
349}
350EXPORT_SYMBOL(inet_proto_csum_replace_by_diff);