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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Generic address resultion entity
4 *
5 * Authors:
6 * net_random Alan Cox
7 * net_ratelimit Andi Kleen
8 * in{4,6}_pton YOSHIFUJI Hideaki, Copyright (C)2006 USAGI/WIDE Project
9 *
10 * Created by Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
11 */
12
13#include <linux/module.h>
14#include <linux/jiffies.h>
15#include <linux/kernel.h>
16#include <linux/ctype.h>
17#include <linux/inet.h>
18#include <linux/mm.h>
19#include <linux/net.h>
20#include <linux/string.h>
21#include <linux/types.h>
22#include <linux/percpu.h>
23#include <linux/init.h>
24#include <linux/ratelimit.h>
25#include <linux/socket.h>
26
27#include <net/sock.h>
28#include <net/net_ratelimit.h>
29#include <net/ipv6.h>
30
31#include <asm/byteorder.h>
32#include <linux/uaccess.h>
33
34DEFINE_RATELIMIT_STATE(net_ratelimit_state, 5 * HZ, 10);
35/*
36 * All net warning printk()s should be guarded by this function.
37 */
38int net_ratelimit(void)
39{
40 return __ratelimit(&net_ratelimit_state);
41}
42EXPORT_SYMBOL(net_ratelimit);
43
44/*
45 * Convert an ASCII string to binary IP.
46 * This is outside of net/ipv4/ because various code that uses IP addresses
47 * is otherwise not dependent on the TCP/IP stack.
48 */
49
50__be32 in_aton(const char *str)
51{
52 unsigned int l;
53 unsigned int val;
54 int i;
55
56 l = 0;
57 for (i = 0; i < 4; i++) {
58 l <<= 8;
59 if (*str != '\0') {
60 val = 0;
61 while (*str != '\0' && *str != '.' && *str != '\n') {
62 val *= 10;
63 val += *str - '0';
64 str++;
65 }
66 l |= val;
67 if (*str != '\0')
68 str++;
69 }
70 }
71 return htonl(l);
72}
73EXPORT_SYMBOL(in_aton);
74
75#define IN6PTON_XDIGIT 0x00010000
76#define IN6PTON_DIGIT 0x00020000
77#define IN6PTON_COLON_MASK 0x00700000
78#define IN6PTON_COLON_1 0x00100000 /* single : requested */
79#define IN6PTON_COLON_2 0x00200000 /* second : requested */
80#define IN6PTON_COLON_1_2 0x00400000 /* :: requested */
81#define IN6PTON_DOT 0x00800000 /* . */
82#define IN6PTON_DELIM 0x10000000
83#define IN6PTON_NULL 0x20000000 /* first/tail */
84#define IN6PTON_UNKNOWN 0x40000000
85
86static inline int xdigit2bin(char c, int delim)
87{
88 int val;
89
90 if (c == delim || c == '\0')
91 return IN6PTON_DELIM;
92 if (c == ':')
93 return IN6PTON_COLON_MASK;
94 if (c == '.')
95 return IN6PTON_DOT;
96
97 val = hex_to_bin(c);
98 if (val >= 0)
99 return val | IN6PTON_XDIGIT | (val < 10 ? IN6PTON_DIGIT : 0);
100
101 if (delim == -1)
102 return IN6PTON_DELIM;
103 return IN6PTON_UNKNOWN;
104}
105
106/**
107 * in4_pton - convert an IPv4 address from literal to binary representation
108 * @src: the start of the IPv4 address string
109 * @srclen: the length of the string, -1 means strlen(src)
110 * @dst: the binary (u8[4] array) representation of the IPv4 address
111 * @delim: the delimiter of the IPv4 address in @src, -1 means no delimiter
112 * @end: A pointer to the end of the parsed string will be placed here
113 *
114 * Return one on success, return zero when any error occurs
115 * and @end will point to the end of the parsed string.
116 *
117 */
118int in4_pton(const char *src, int srclen,
119 u8 *dst,
120 int delim, const char **end)
121{
122 const char *s;
123 u8 *d;
124 u8 dbuf[4];
125 int ret = 0;
126 int i;
127 int w = 0;
128
129 if (srclen < 0)
130 srclen = strlen(src);
131 s = src;
132 d = dbuf;
133 i = 0;
134 while (1) {
135 int c;
136 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
137 if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) {
138 goto out;
139 }
140 if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
141 if (w == 0)
142 goto out;
143 *d++ = w & 0xff;
144 w = 0;
145 i++;
146 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
147 if (i != 4)
148 goto out;
149 break;
150 }
151 goto cont;
152 }
153 w = (w * 10) + c;
154 if ((w & 0xffff) > 255) {
155 goto out;
156 }
157cont:
158 if (i >= 4)
159 goto out;
160 s++;
161 srclen--;
162 }
163 ret = 1;
164 memcpy(dst, dbuf, sizeof(dbuf));
165out:
166 if (end)
167 *end = s;
168 return ret;
169}
170EXPORT_SYMBOL(in4_pton);
171
172/**
173 * in6_pton - convert an IPv6 address from literal to binary representation
174 * @src: the start of the IPv6 address string
175 * @srclen: the length of the string, -1 means strlen(src)
176 * @dst: the binary (u8[16] array) representation of the IPv6 address
177 * @delim: the delimiter of the IPv6 address in @src, -1 means no delimiter
178 * @end: A pointer to the end of the parsed string will be placed here
179 *
180 * Return one on success, return zero when any error occurs
181 * and @end will point to the end of the parsed string.
182 *
183 */
184int in6_pton(const char *src, int srclen,
185 u8 *dst,
186 int delim, const char **end)
187{
188 const char *s, *tok = NULL;
189 u8 *d, *dc = NULL;
190 u8 dbuf[16];
191 int ret = 0;
192 int i;
193 int state = IN6PTON_COLON_1_2 | IN6PTON_XDIGIT | IN6PTON_NULL;
194 int w = 0;
195
196 memset(dbuf, 0, sizeof(dbuf));
197
198 s = src;
199 d = dbuf;
200 if (srclen < 0)
201 srclen = strlen(src);
202
203 while (1) {
204 int c;
205
206 c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
207 if (!(c & state))
208 goto out;
209 if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
210 /* process one 16-bit word */
211 if (!(state & IN6PTON_NULL)) {
212 *d++ = (w >> 8) & 0xff;
213 *d++ = w & 0xff;
214 }
215 w = 0;
216 if (c & IN6PTON_DELIM) {
217 /* We've processed last word */
218 break;
219 }
220 /*
221 * COLON_1 => XDIGIT
222 * COLON_2 => XDIGIT|DELIM
223 * COLON_1_2 => COLON_2
224 */
225 switch (state & IN6PTON_COLON_MASK) {
226 case IN6PTON_COLON_2:
227 dc = d;
228 state = IN6PTON_XDIGIT | IN6PTON_DELIM;
229 if (dc - dbuf >= sizeof(dbuf))
230 state |= IN6PTON_NULL;
231 break;
232 case IN6PTON_COLON_1|IN6PTON_COLON_1_2:
233 state = IN6PTON_XDIGIT | IN6PTON_COLON_2;
234 break;
235 case IN6PTON_COLON_1:
236 state = IN6PTON_XDIGIT;
237 break;
238 case IN6PTON_COLON_1_2:
239 state = IN6PTON_COLON_2;
240 break;
241 default:
242 state = 0;
243 }
244 tok = s + 1;
245 goto cont;
246 }
247
248 if (c & IN6PTON_DOT) {
249 ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s);
250 if (ret > 0) {
251 d += 4;
252 break;
253 }
254 goto out;
255 }
256
257 w = (w << 4) | (0xff & c);
258 state = IN6PTON_COLON_1 | IN6PTON_DELIM;
259 if (!(w & 0xf000)) {
260 state |= IN6PTON_XDIGIT;
261 }
262 if (!dc && d + 2 < dbuf + sizeof(dbuf)) {
263 state |= IN6PTON_COLON_1_2;
264 state &= ~IN6PTON_DELIM;
265 }
266 if (d + 2 >= dbuf + sizeof(dbuf)) {
267 state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2);
268 }
269cont:
270 if ((dc && d + 4 < dbuf + sizeof(dbuf)) ||
271 d + 4 == dbuf + sizeof(dbuf)) {
272 state |= IN6PTON_DOT;
273 }
274 if (d >= dbuf + sizeof(dbuf)) {
275 state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK);
276 }
277 s++;
278 srclen--;
279 }
280
281 i = 15; d--;
282
283 if (dc) {
284 while (d >= dc)
285 dst[i--] = *d--;
286 while (i >= dc - dbuf)
287 dst[i--] = 0;
288 while (i >= 0)
289 dst[i--] = *d--;
290 } else
291 memcpy(dst, dbuf, sizeof(dbuf));
292
293 ret = 1;
294out:
295 if (end)
296 *end = s;
297 return ret;
298}
299EXPORT_SYMBOL(in6_pton);
300
301static int inet4_pton(const char *src, u16 port_num,
302 struct sockaddr_storage *addr)
303{
304 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
305 size_t srclen = strlen(src);
306
307 if (srclen > INET_ADDRSTRLEN)
308 return -EINVAL;
309
310 if (in4_pton(src, srclen, (u8 *)&addr4->sin_addr.s_addr,
311 '\n', NULL) == 0)
312 return -EINVAL;
313
314 addr4->sin_family = AF_INET;
315 addr4->sin_port = htons(port_num);
316
317 return 0;
318}
319
320static int inet6_pton(struct net *net, const char *src, u16 port_num,
321 struct sockaddr_storage *addr)
322{
323 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
324 const char *scope_delim;
325 size_t srclen = strlen(src);
326
327 if (srclen > INET6_ADDRSTRLEN)
328 return -EINVAL;
329
330 if (in6_pton(src, srclen, (u8 *)&addr6->sin6_addr.s6_addr,
331 '%', &scope_delim) == 0)
332 return -EINVAL;
333
334 if (ipv6_addr_type(&addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL &&
335 src + srclen != scope_delim && *scope_delim == '%') {
336 struct net_device *dev;
337 char scope_id[16];
338 size_t scope_len = min_t(size_t, sizeof(scope_id) - 1,
339 src + srclen - scope_delim - 1);
340
341 memcpy(scope_id, scope_delim + 1, scope_len);
342 scope_id[scope_len] = '\0';
343
344 dev = dev_get_by_name(net, scope_id);
345 if (dev) {
346 addr6->sin6_scope_id = dev->ifindex;
347 dev_put(dev);
348 } else if (kstrtouint(scope_id, 0, &addr6->sin6_scope_id)) {
349 return -EINVAL;
350 }
351 }
352
353 addr6->sin6_family = AF_INET6;
354 addr6->sin6_port = htons(port_num);
355
356 return 0;
357}
358
359/**
360 * inet_pton_with_scope - convert an IPv4/IPv6 and port to socket address
361 * @net: net namespace (used for scope handling)
362 * @af: address family, AF_INET, AF_INET6 or AF_UNSPEC for either
363 * @src: the start of the address string
364 * @port: the start of the port string (or NULL for none)
365 * @addr: output socket address
366 *
367 * Return zero on success, return errno when any error occurs.
368 */
369int inet_pton_with_scope(struct net *net, __kernel_sa_family_t af,
370 const char *src, const char *port, struct sockaddr_storage *addr)
371{
372 u16 port_num;
373 int ret = -EINVAL;
374
375 if (port) {
376 if (kstrtou16(port, 0, &port_num))
377 return -EINVAL;
378 } else {
379 port_num = 0;
380 }
381
382 switch (af) {
383 case AF_INET:
384 ret = inet4_pton(src, port_num, addr);
385 break;
386 case AF_INET6:
387 ret = inet6_pton(net, src, port_num, addr);
388 break;
389 case AF_UNSPEC:
390 ret = inet4_pton(src, port_num, addr);
391 if (ret)
392 ret = inet6_pton(net, src, port_num, addr);
393 break;
394 default:
395 pr_err("unexpected address family %d\n", af);
396 }
397
398 return ret;
399}
400EXPORT_SYMBOL(inet_pton_with_scope);
401
402bool inet_addr_is_any(struct sockaddr *addr)
403{
404 if (addr->sa_family == AF_INET6) {
405 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)addr;
406 const struct sockaddr_in6 in6_any =
407 { .sin6_addr = IN6ADDR_ANY_INIT };
408
409 if (!memcmp(in6->sin6_addr.s6_addr,
410 in6_any.sin6_addr.s6_addr, 16))
411 return true;
412 } else if (addr->sa_family == AF_INET) {
413 struct sockaddr_in *in = (struct sockaddr_in *)addr;
414
415 if (in->sin_addr.s_addr == htonl(INADDR_ANY))
416 return true;
417 } else {
418 pr_warn("unexpected address family %u\n", addr->sa_family);
419 }
420
421 return false;
422}
423EXPORT_SYMBOL(inet_addr_is_any);
424
425void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
426 __be32 from, __be32 to, bool pseudohdr)
427{
428 if (skb->ip_summed != CHECKSUM_PARTIAL) {
429 csum_replace4(sum, from, to);
430 if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
431 skb->csum = ~csum_add(csum_sub(~(skb->csum),
432 (__force __wsum)from),
433 (__force __wsum)to);
434 } else if (pseudohdr)
435 *sum = ~csum_fold(csum_add(csum_sub(csum_unfold(*sum),
436 (__force __wsum)from),
437 (__force __wsum)to));
438}
439EXPORT_SYMBOL(inet_proto_csum_replace4);
440
441/**
442 * inet_proto_csum_replace16 - update layer 4 header checksum field
443 * @sum: Layer 4 header checksum field
444 * @skb: sk_buff for the packet
445 * @from: old IPv6 address
446 * @to: new IPv6 address
447 * @pseudohdr: True if layer 4 header checksum includes pseudoheader
448 *
449 * Update layer 4 header as per the update in IPv6 src/dst address.
450 *
451 * There is no need to update skb->csum in this function, because update in two
452 * fields a.) IPv6 src/dst address and b.) L4 header checksum cancels each other
453 * for skb->csum calculation. Whereas inet_proto_csum_replace4 function needs to
454 * update skb->csum, because update in 3 fields a.) IPv4 src/dst address,
455 * b.) IPv4 Header checksum and c.) L4 header checksum results in same diff as
456 * L4 Header checksum for skb->csum calculation.
457 */
458void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,
459 const __be32 *from, const __be32 *to,
460 bool pseudohdr)
461{
462 __be32 diff[] = {
463 ~from[0], ~from[1], ~from[2], ~from[3],
464 to[0], to[1], to[2], to[3],
465 };
466 if (skb->ip_summed != CHECKSUM_PARTIAL) {
467 *sum = csum_fold(csum_partial(diff, sizeof(diff),
468 ~csum_unfold(*sum)));
469 } else if (pseudohdr)
470 *sum = ~csum_fold(csum_partial(diff, sizeof(diff),
471 csum_unfold(*sum)));
472}
473EXPORT_SYMBOL(inet_proto_csum_replace16);
474
475void inet_proto_csum_replace_by_diff(__sum16 *sum, struct sk_buff *skb,
476 __wsum diff, bool pseudohdr)
477{
478 if (skb->ip_summed != CHECKSUM_PARTIAL) {
479 csum_replace_by_diff(sum, diff);
480 if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
481 skb->csum = ~csum_sub(diff, skb->csum);
482 } else if (pseudohdr) {
483 *sum = ~csum_fold(csum_add(diff, csum_unfold(*sum)));
484 }
485}
486EXPORT_SYMBOL(inet_proto_csum_replace_by_diff);
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);