2 * Generic address resultion entity
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>
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/types.h>
25 #include <linux/random.h>
26 #include <linux/percpu.h>
27 #include <linux/init.h>
30 #include <asm/byteorder.h>
31 #include <asm/system.h>
32 #include <asm/uaccess.h>
34 int net_msg_warn __read_mostly = 1;
35 EXPORT_SYMBOL(net_msg_warn);
37 DEFINE_RATELIMIT_STATE(net_ratelimit_state, 5 * HZ, 10);
39 * All net warning printk()s should be guarded by this function.
41 int net_ratelimit(void)
43 return __ratelimit(&net_ratelimit_state);
45 EXPORT_SYMBOL(net_ratelimit);
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.
53 __be32 in_aton(const char *str)
60 for (i = 0; i < 4; i++)
66 while (*str != '\0' && *str != '.' && *str != '\n')
80 EXPORT_SYMBOL(in_aton);
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
93 static inline int xdigit2bin(char c, int delim)
95 if (c == delim || c == '\0')
98 return IN6PTON_COLON_MASK;
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));
108 return IN6PTON_DELIM;
109 return IN6PTON_UNKNOWN;
112 int in4_pton(const char *src, int srclen,
114 int delim, const char **end)
124 srclen = strlen(src);
130 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
131 if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) {
134 if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
140 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
148 if ((w & 0xffff) > 255) {
158 memcpy(dst, dbuf, sizeof(dbuf));
165 EXPORT_SYMBOL(in4_pton);
167 int in6_pton(const char *src, int srclen,
169 int delim, const char **end)
171 const char *s, *tok = NULL;
176 int state = IN6PTON_COLON_1_2 | IN6PTON_XDIGIT | IN6PTON_NULL;
179 memset(dbuf, 0, sizeof(dbuf));
184 srclen = strlen(src);
189 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
192 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
193 /* process one 16-bit word */
194 if (!(state & IN6PTON_NULL)) {
195 *d++ = (w >> 8) & 0xff;
199 if (c & IN6PTON_DELIM) {
200 /* We've processed last word */
205 * COLON_2 => XDIGIT|DELIM
206 * COLON_1_2 => COLON_2
208 switch (state & IN6PTON_COLON_MASK) {
209 case IN6PTON_COLON_2:
211 state = IN6PTON_XDIGIT | IN6PTON_DELIM;
212 if (dc - dbuf >= sizeof(dbuf))
213 state |= IN6PTON_NULL;
215 case IN6PTON_COLON_1|IN6PTON_COLON_1_2:
216 state = IN6PTON_XDIGIT | IN6PTON_COLON_2;
218 case IN6PTON_COLON_1:
219 state = IN6PTON_XDIGIT;
221 case IN6PTON_COLON_1_2:
222 state = IN6PTON_COLON_2;
231 if (c & IN6PTON_DOT) {
232 ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s);
240 w = (w << 4) | (0xff & c);
241 state = IN6PTON_COLON_1 | IN6PTON_DELIM;
243 state |= IN6PTON_XDIGIT;
245 if (!dc && d + 2 < dbuf + sizeof(dbuf)) {
246 state |= IN6PTON_COLON_1_2;
247 state &= ~IN6PTON_DELIM;
249 if (d + 2 >= dbuf + sizeof(dbuf)) {
250 state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2);
253 if ((dc && d + 4 < dbuf + sizeof(dbuf)) ||
254 d + 4 == dbuf + sizeof(dbuf)) {
255 state |= IN6PTON_DOT;
257 if (d >= dbuf + sizeof(dbuf)) {
258 state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK);
269 while(i >= dc - dbuf)
274 memcpy(dst, dbuf, sizeof(dbuf));
283 EXPORT_SYMBOL(in6_pton);
285 void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
286 __be32 from, __be32 to, int pseudohdr)
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),
295 } else if (pseudohdr)
296 *sum = ~csum_fold(csum_partial(diff, sizeof(diff),
299 EXPORT_SYMBOL(inet_proto_csum_replace4);