[mirror_ubuntu-bionic-kernel.git] / net / core / utils.c

/*
 *	Generic address resultion entity
 *
 *	Authors:
 *	net_random Alan Cox
 *	net_ratelimit Andi Kleen
 *	in{4,6}_pton YOSHIFUJI Hideaki, Copyright (C)2006 USAGI/WIDE Project
 *
 *	Created by Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/inet.h>
#include <linux/mm.h>
#include <linux/net.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/percpu.h>
#include <linux/init.h>
#include <linux/ratelimit.h>
#include <linux/socket.h>

#include <net/sock.h>
#include <net/net_ratelimit.h>
#include <net/ipv6.h>

#include <asm/byteorder.h>
#include <linux/uaccess.h>

DEFINE_RATELIMIT_STATE(net_ratelimit_state, 5 * HZ, 10);
/*
 * All net warning printk()s should be guarded by this function.
 */
int net_ratelimit(void)
{
	return __ratelimit(&net_ratelimit_state);
}
EXPORT_SYMBOL(net_ratelimit);

/*
 * Convert an ASCII string to binary IP.
 * This is outside of net/ipv4/ because various code that uses IP addresses
 * is otherwise not dependent on the TCP/IP stack.
 */

__be32 in_aton(const char *str)
{
	unsigned int l;
	unsigned int val;
	int i;

	l = 0;
	for (i = 0; i < 4; i++)	{
		l <<= 8;
		if (*str != '\0') {
			val = 0;
			while (*str != '\0' && *str != '.' && *str != '\n') {
				val *= 10;
				val += *str - '0';
				str++;
			}
			l |= val;
			if (*str != '\0')
				str++;
		}
	}
	return htonl(l);
}
EXPORT_SYMBOL(in_aton);

#define IN6PTON_XDIGIT		0x00010000
#define IN6PTON_DIGIT		0x00020000
#define IN6PTON_COLON_MASK	0x00700000
#define IN6PTON_COLON_1		0x00100000	/* single : requested */
#define IN6PTON_COLON_2		0x00200000	/* second : requested */
#define IN6PTON_COLON_1_2	0x00400000	/* :: requested */
#define IN6PTON_DOT		0x00800000	/* . */
#define IN6PTON_DELIM		0x10000000
#define IN6PTON_NULL		0x20000000	/* first/tail */
#define IN6PTON_UNKNOWN		0x40000000

static inline int xdigit2bin(char c, int delim)
{
	int val;

	if (c == delim || c == '\0')
		return IN6PTON_DELIM;
	if (c == ':')
		return IN6PTON_COLON_MASK;
	if (c == '.')
		return IN6PTON_DOT;

	val = hex_to_bin(c);
	if (val >= 0)
		return val | IN6PTON_XDIGIT | (val < 10 ? IN6PTON_DIGIT : 0);

	if (delim == -1)
		return IN6PTON_DELIM;
	return IN6PTON_UNKNOWN;
}

/**
 * in4_pton - convert an IPv4 address from literal to binary representation
 * @src: the start of the IPv4 address string
 * @srclen: the length of the string, -1 means strlen(src)
 * @dst: the binary (u8[4] array) representation of the IPv4 address
 * @delim: the delimiter of the IPv4 address in @src, -1 means no delimiter
 * @end: A pointer to the end of the parsed string will be placed here
 *
 * Return one on success, return zero when any error occurs
 * and @end will point to the end of the parsed string.
 *
 */
int in4_pton(const char *src, int srclen,
	     u8 *dst,
	     int delim, const char **end)
{
	const char *s;
	u8 *d;
	u8 dbuf[4];
	int ret = 0;
	int i;
	int w = 0;

	if (srclen < 0)
		srclen = strlen(src);
	s = src;
	d = dbuf;
	i = 0;
	while (1) {
		int c;
		c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
		if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) {
			goto out;
		}
		if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
			if (w == 0)
				goto out;
			*d++ = w & 0xff;
			w = 0;
			i++;
			if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
				if (i != 4)
					goto out;
				break;
			}
			goto cont;
		}
		w = (w * 10) + c;
		if ((w & 0xffff) > 255) {
			goto out;
		}
cont:
		if (i >= 4)
			goto out;
		s++;
		srclen--;
	}
	ret = 1;
	memcpy(dst, dbuf, sizeof(dbuf));
out:
	if (end)
		*end = s;
	return ret;
}
EXPORT_SYMBOL(in4_pton);

/**
 * in6_pton - convert an IPv6 address from literal to binary representation
 * @src: the start of the IPv6 address string
 * @srclen: the length of the string, -1 means strlen(src)
 * @dst: the binary (u8[16] array) representation of the IPv6 address
 * @delim: the delimiter of the IPv6 address in @src, -1 means no delimiter
 * @end: A pointer to the end of the parsed string will be placed here
 *
 * Return one on success, return zero when any error occurs
 * and @end will point to the end of the parsed string.
 *
 */
int in6_pton(const char *src, int srclen,
	     u8 *dst,
	     int delim, const char **end)
{
	const char *s, *tok = NULL;
	u8 *d, *dc = NULL;
	u8 dbuf[16];
	int ret = 0;
	int i;
	int state = IN6PTON_COLON_1_2 | IN6PTON_XDIGIT | IN6PTON_NULL;
	int w = 0;

	memset(dbuf, 0, sizeof(dbuf));

	s = src;
	d = dbuf;
	if (srclen < 0)
		srclen = strlen(src);

	while (1) {
		int c;

		c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
		if (!(c & state))
			goto out;
		if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) {
			/* process one 16-bit word */
			if (!(state & IN6PTON_NULL)) {
				*d++ = (w >> 8) & 0xff;
				*d++ = w & 0xff;
			}
			w = 0;
			if (c & IN6PTON_DELIM) {
				/* We've processed last word */
				break;
			}
			/*
			 * COLON_1 => XDIGIT
			 * COLON_2 => XDIGIT|DELIM
			 * COLON_1_2 => COLON_2
			 */
			switch (state & IN6PTON_COLON_MASK) {
			case IN6PTON_COLON_2:
				dc = d;
				state = IN6PTON_XDIGIT | IN6PTON_DELIM;
				if (dc - dbuf >= sizeof(dbuf))
					state |= IN6PTON_NULL;
				break;
			case IN6PTON_COLON_1|IN6PTON_COLON_1_2:
				state = IN6PTON_XDIGIT | IN6PTON_COLON_2;
				break;
			case IN6PTON_COLON_1:
				state = IN6PTON_XDIGIT;
				break;
			case IN6PTON_COLON_1_2:
				state = IN6PTON_COLON_2;
				break;
			default:
				state = 0;
			}
			tok = s + 1;
			goto cont;
		}

		if (c & IN6PTON_DOT) {
			ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s);
			if (ret > 0) {
				d += 4;
				break;
			}
			goto out;
		}

		w = (w << 4) | (0xff & c);
		state = IN6PTON_COLON_1 | IN6PTON_DELIM;
		if (!(w & 0xf000)) {
			state |= IN6PTON_XDIGIT;
		}
		if (!dc && d + 2 < dbuf + sizeof(dbuf)) {
			state |= IN6PTON_COLON_1_2;
			state &= ~IN6PTON_DELIM;
		}
		if (d + 2 >= dbuf + sizeof(dbuf)) {
			state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2);
		}
cont:
		if ((dc && d + 4 < dbuf + sizeof(dbuf)) ||
		    d + 4 == dbuf + sizeof(dbuf)) {
			state |= IN6PTON_DOT;
		}
		if (d >= dbuf + sizeof(dbuf)) {
			state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK);
		}
		s++;
		srclen--;
	}

	i = 15; d--;

	if (dc) {
		while (d >= dc)
			dst[i--] = *d--;
		while (i >= dc - dbuf)
			dst[i--] = 0;
		while (i >= 0)
			dst[i--] = *d--;
	} else
		memcpy(dst, dbuf, sizeof(dbuf));

	ret = 1;
out:
	if (end)
		*end = s;
	return ret;
}
EXPORT_SYMBOL(in6_pton);

static int inet4_pton(const char *src, u16 port_num,
		struct sockaddr_storage *addr)
{
	struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
	int srclen = strlen(src);

	if (srclen > INET_ADDRSTRLEN)
		return -EINVAL;

	if (in4_pton(src, srclen, (u8 *)&addr4->sin_addr.s_addr,
		     '\n', NULL) == 0)
		return -EINVAL;

	addr4->sin_family = AF_INET;
	addr4->sin_port = htons(port_num);

	return 0;
}

static int inet6_pton(struct net *net, const char *src, u16 port_num,
		struct sockaddr_storage *addr)
{
	struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
	const char *scope_delim;
	int srclen = strlen(src);

	if (srclen > INET6_ADDRSTRLEN)
		return -EINVAL;

	if (in6_pton(src, srclen, (u8 *)&addr6->sin6_addr.s6_addr,
		     '%', &scope_delim) == 0)
		return -EINVAL;

	if (ipv6_addr_type(&addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL &&
	    src + srclen != scope_delim && *scope_delim == '%') {
		struct net_device *dev;
		char scope_id[16];
		size_t scope_len = min_t(size_t, sizeof(scope_id) - 1,
					 src + srclen - scope_delim - 1);

		memcpy(scope_id, scope_delim + 1, scope_len);
		scope_id[scope_len] = '\0';

		dev = dev_get_by_name(net, scope_id);
		if (dev) {
			addr6->sin6_scope_id = dev->ifindex;
			dev_put(dev);
		} else if (kstrtouint(scope_id, 0, &addr6->sin6_scope_id)) {
			return -EINVAL;
		}
	}

	addr6->sin6_family = AF_INET6;
	addr6->sin6_port = htons(port_num);

	return 0;
}

/**
 * inet_pton_with_scope - convert an IPv4/IPv6 and port to socket address
 * @net: net namespace (used for scope handling)
 * @af: address family, AF_INET, AF_INET6 or AF_UNSPEC for either
 * @src: the start of the address string
 * @port: the start of the port string (or NULL for none)
 * @addr: output socket address
 *
 * Return zero on success, return errno when any error occurs.
 */
int inet_pton_with_scope(struct net *net, __kernel_sa_family_t af,
		const char *src, const char *port, struct sockaddr_storage *addr)
{
	u16 port_num;
	int ret = -EINVAL;

	if (port) {
		if (kstrtou16(port, 0, &port_num))
			return -EINVAL;
	} else {
		port_num = 0;
	}

	switch (af) {
	case AF_INET:
		ret = inet4_pton(src, port_num, addr);
		break;
	case AF_INET6:
		ret = inet6_pton(net, src, port_num, addr);
		break;
	case AF_UNSPEC:
		ret = inet4_pton(src, port_num, addr);
		if (ret)
			ret = inet6_pton(net, src, port_num, addr);
		break;
	default:
		pr_err("unexpected address family %d\n", af);
	};

	return ret;
}
EXPORT_SYMBOL(inet_pton_with_scope);

void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
			      __be32 from, __be32 to, bool pseudohdr)
{
	if (skb->ip_summed != CHECKSUM_PARTIAL) {
		csum_replace4(sum, from, to);
		if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
			skb->csum = ~csum_add(csum_sub(~(skb->csum),
						       (__force __wsum)from),
					      (__force __wsum)to);
	} else if (pseudohdr)
		*sum = ~csum_fold(csum_add(csum_sub(csum_unfold(*sum),
						    (__force __wsum)from),
					   (__force __wsum)to));
}
EXPORT_SYMBOL(inet_proto_csum_replace4);

void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,
			       const __be32 *from, const __be32 *to,
			       bool pseudohdr)
{
	__be32 diff[] = {
		~from[0], ~from[1], ~from[2], ~from[3],
		to[0], to[1], to[2], to[3],
	};
	if (skb->ip_summed != CHECKSUM_PARTIAL) {
		*sum = csum_fold(csum_partial(diff, sizeof(diff),
				 ~csum_unfold(*sum)));
		if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
			skb->csum = ~csum_partial(diff, sizeof(diff),
						  ~skb->csum);
	} else if (pseudohdr)
		*sum = ~csum_fold(csum_partial(diff, sizeof(diff),
				  csum_unfold(*sum)));
}
EXPORT_SYMBOL(inet_proto_csum_replace16);

void inet_proto_csum_replace_by_diff(__sum16 *sum, struct sk_buff *skb,
				     __wsum diff, bool pseudohdr)
{
	if (skb->ip_summed != CHECKSUM_PARTIAL) {
		*sum = csum_fold(csum_add(diff, ~csum_unfold(*sum)));
		if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
			skb->csum = ~csum_add(diff, ~skb->csum);
	} else if (pseudohdr) {
		*sum = ~csum_fold(csum_add(diff, csum_unfold(*sum)));
	}
}
EXPORT_SYMBOL(inet_proto_csum_replace_by_diff);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Generic address resultion entity
	3	*
	4	* Authors:
	5	* net_random Alan Cox
75b31c33	6	* net_ratelimit Andi Kleen
1aaec67f	7	* in{4,6}_pton YOSHIFUJI Hideaki, Copyright (C)2006 USAGI/WIDE Project
1da177e4 LT	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>
5a048e3b	20	#include <linux/ctype.h>
20380731	21	#include <linux/inet.h>
1da177e4	22	#include <linux/mm.h>
20380731	23	#include <linux/net.h>
1da177e4 LT	24	#include <linux/string.h>
1da177e4 LT	25	#include <linux/types.h>
1da177e4 LT	26	#include <linux/percpu.h>
1da177e4 LT	27	#include <linux/init.h>
3fff4c42	28	#include <linux/ratelimit.h>
b1a951fe	29	#include <linux/socket.h>
3fff4c42	30
14ae8566	31	#include <net/sock.h>
c5c177b4	32	#include <net/net_ratelimit.h>
b1a951fe	33	#include <net/ipv6.h>
1da177e4	34
5e43db77	35	#include <asm/byteorder.h>
7c0f6ba6	36	#include <linux/uaccess.h>
1da177e4	37
717115e1	38	DEFINE_RATELIMIT_STATE(net_ratelimit_state, 5 * HZ, 10);
4ec93edb	39	/*
1da177e4	40	* All net warning printk()s should be guarded by this function.
4ec93edb	41	*/
1da177e4 LT	42	int net_ratelimit(void)
1da177e4 LT	43	{
717115e1	44	return __ratelimit(&net_ratelimit_state);
1da177e4	45	}
1da177e4	46	EXPORT_SYMBOL(net_ratelimit);
5e43db77 MM	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
a2167dc6	54	__be32 in_aton(const char *str)
5e43db77	55	{
e013fb7c	56	unsigned int l;
5e43db77 MM	57	unsigned int val;
	58	int i;
	59
	60	l = 0;
46ba5b23	61	for (i = 0; i < 4; i++) {
5e43db77	62	l <<= 8;
46ba5b23	63	if (*str != '\0') {
5e43db77	64	val = 0;
46ba5b23	65	while (str != '\0' && str != '.' && *str != '\n') {
5e43db77 MM	66	val *= 10;
	67	val += *str - '0';
	68	str++;
	69	}
	70	l \|= val;
	71	if (*str != '\0')
	72	str++;
	73	}
	74	}
a02cec21	75	return htonl(l);
5e43db77	76	}
5e43db77	77	EXPORT_SYMBOL(in_aton);
1aaec67f YH	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
9a7c9337	90	static inline int xdigit2bin(char c, int delim)
1aaec67f	91	{
82fd5b5d AS	92	int val;
82fd5b5d AS	93
1aaec67f YH	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;
82fd5b5d AS	100
	101	val = hex_to_bin(c);
	102	if (val >= 0)
	103	return val \| IN6PTON_XDIGIT \| (val < 10 ? IN6PTON_DIGIT : 0);
	104
9a7c9337 PM	105	if (delim == -1)
9a7c9337 PM	106	return IN6PTON_DELIM;
1aaec67f YH	107	return IN6PTON_UNKNOWN;
	108	}
	109
93ac0ef0 AW	110	/**
	111	* in4_pton - convert an IPv4 address from literal to binary representation
	112	* @src: the start of the IPv4 address string
	113	* @srclen: the length of the string, -1 means strlen(src)
	114	* @dst: the binary (u8[4] array) representation of the IPv4 address
	115	* @delim: the delimiter of the IPv4 address in @src, -1 means no delimiter
	116	* @end: A pointer to the end of the parsed string will be placed here
	117	*
	118	* Return one on success, return zero when any error occurs
	119	* and @end will point to the end of the parsed string.
	120	*
	121	*/
1aaec67f YH	122	int in4_pton(const char *src, int srclen,
1aaec67f YH	123	u8 *dst,
9a7c9337	124	int delim, const char **end)
1aaec67f YH	125	{
	126	const char *s;
	127	u8 *d;
	128	u8 dbuf[4];
	129	int ret = 0;
	130	int i;
	131	int w = 0;
	132
	133	if (srclen < 0)
	134	srclen = strlen(src);
	135	s = src;
	136	d = dbuf;
	137	i = 0;
8a01ed70	138	while (1) {
1aaec67f YH	139	int c;
1aaec67f YH	140	c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
83f03fa5	141	if (!(c & (IN6PTON_DIGIT \| IN6PTON_DOT \| IN6PTON_DELIM \| IN6PTON_COLON_MASK))) {
1aaec67f YH	142	goto out;
1aaec67f YH	143	}
83f03fa5	144	if (c & (IN6PTON_DOT \| IN6PTON_DELIM \| IN6PTON_COLON_MASK)) {
1aaec67f YH	145	if (w == 0)
	146	goto out;
	147	*d++ = w & 0xff;
	148	w = 0;
	149	i++;
83f03fa5	150	if (c & (IN6PTON_DELIM \| IN6PTON_COLON_MASK)) {
1aaec67f YH	151	if (i != 4)
	152	goto out;
	153	break;
	154	}
	155	goto cont;
	156	}
	157	w = (w * 10) + c;
	158	if ((w & 0xffff) > 255) {
	159	goto out;
	160	}
	161	cont:
	162	if (i >= 4)
	163	goto out;
	164	s++;
	165	srclen--;
	166	}
	167	ret = 1;
	168	memcpy(dst, dbuf, sizeof(dbuf));
	169	out:
	170	if (end)
	171	*end = s;
	172	return ret;
	173	}
1aaec67f YH	174	EXPORT_SYMBOL(in4_pton);
1aaec67f YH	175
28194fcd AW	176	/**
	177	* in6_pton - convert an IPv6 address from literal to binary representation
	178	* @src: the start of the IPv6 address string
	179	* @srclen: the length of the string, -1 means strlen(src)
	180	* @dst: the binary (u8[16] array) representation of the IPv6 address
	181	* @delim: the delimiter of the IPv6 address in @src, -1 means no delimiter
	182	* @end: A pointer to the end of the parsed string will be placed here
	183	*
	184	* Return one on success, return zero when any error occurs
	185	* and @end will point to the end of the parsed string.
	186	*
	187	*/
1aaec67f YH	188	int in6_pton(const char *src, int srclen,
1aaec67f YH	189	u8 *dst,
9a7c9337	190	int delim, const char **end)
1aaec67f YH	191	{
	192	const char s, tok = NULL;
	193	u8 d, dc = NULL;
	194	u8 dbuf[16];
	195	int ret = 0;
	196	int i;
	197	int state = IN6PTON_COLON_1_2 \| IN6PTON_XDIGIT \| IN6PTON_NULL;
	198	int w = 0;
	199
	200	memset(dbuf, 0, sizeof(dbuf));
	201
	202	s = src;
	203	d = dbuf;
	204	if (srclen < 0)
	205	srclen = strlen(src);
	206
1aaec67f YH	207	while (1) {
	208	int c;
	209
	210	c = xdigit2bin(srclen > 0 ? *s : '\0', delim);
	211	if (!(c & state))
	212	goto out;
	213	if (c & (IN6PTON_DELIM \| IN6PTON_COLON_MASK)) {
	214	/* process one 16-bit word */
	215	if (!(state & IN6PTON_NULL)) {
	216	*d++ = (w >> 8) & 0xff;
	217	*d++ = w & 0xff;
	218	}
	219	w = 0;
	220	if (c & IN6PTON_DELIM) {
	221	/* We've processed last word */
	222	break;
	223	}
	224	/*
	225	* COLON_1 => XDIGIT
	226	* COLON_2 => XDIGIT\|DELIM
	227	* COLON_1_2 => COLON_2
	228	*/
	229	switch (state & IN6PTON_COLON_MASK) {
	230	case IN6PTON_COLON_2:
	231	dc = d;
	232	state = IN6PTON_XDIGIT \| IN6PTON_DELIM;
	233	if (dc - dbuf >= sizeof(dbuf))
	234	state \|= IN6PTON_NULL;
	235	break;
	236	case IN6PTON_COLON_1\|IN6PTON_COLON_1_2:
	237	state = IN6PTON_XDIGIT \| IN6PTON_COLON_2;
	238	break;
	239	case IN6PTON_COLON_1:
	240	state = IN6PTON_XDIGIT;
	241	break;
	242	case IN6PTON_COLON_1_2:
	243	state = IN6PTON_COLON_2;
	244	break;
	245	default:
	246	state = 0;
	247	}
	248	tok = s + 1;
	249	goto cont;
	250	}
	251
	252	if (c & IN6PTON_DOT) {
	253	ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s);
	254	if (ret > 0) {
	255	d += 4;
	256	break;
	257	}
	258	goto out;
	259	}
	260
	261	w = (w << 4) \| (0xff & c);
	262	state = IN6PTON_COLON_1 \| IN6PTON_DELIM;
	263	if (!(w & 0xf000)) {
	264	state \|= IN6PTON_XDIGIT;
	265	}
	266	if (!dc && d + 2 < dbuf + sizeof(dbuf)) {
	267	state \|= IN6PTON_COLON_1_2;
	268	state &= ~IN6PTON_DELIM;
	269	}
	270	if (d + 2 >= dbuf + sizeof(dbuf)) {
271	state &= ~(IN6PTON_COLON_1\|IN6PTON_COLON_1_2);
272	}
273	cont:
274	if ((dc && d + 4 < dbuf + sizeof(dbuf)) \|\|
275	d + 4 == dbuf + sizeof(dbuf)) {
276	state \|= IN6PTON_DOT;
277	}
278	if (d >= dbuf + sizeof(dbuf)) {
279	state &= ~(IN6PTON_XDIGIT\|IN6PTON_COLON_MASK);
280	}
281	s++;
282	srclen--;
283	}
284
285	i = 15; d--;
286
287	if (dc) {
8a01ed70	288	while (d >= dc)
1aaec67f	289	dst[i--] = *d--;
8a01ed70	290	while (i >= dc - dbuf)
1aaec67f	291	dst[i--] = 0;
8a01ed70	292	while (i >= 0)
1aaec67f YH	293	dst[i--] = *d--;
	294	} else
	295	memcpy(dst, dbuf, sizeof(dbuf));
	296
	297	ret = 1;
	298	out:
	299	if (end)
	300	*end = s;
	301	return ret;
	302	}
1aaec67f	303	EXPORT_SYMBOL(in6_pton);
a99a00cf	304
b1a951fe SG	305	static int inet4_pton(const char *src, u16 port_num,
	306	struct sockaddr_storage *addr)
	307	{
	308	struct sockaddr_in addr4 = (struct sockaddr_in )addr;
	309	int srclen = strlen(src);
	310
	311	if (srclen > INET_ADDRSTRLEN)
	312	return -EINVAL;
	313
	314	if (in4_pton(src, srclen, (u8 *)&addr4->sin_addr.s_addr,
	315	'\n', NULL) == 0)
	316	return -EINVAL;
	317
	318	addr4->sin_family = AF_INET;
	319	addr4->sin_port = htons(port_num);
	320
	321	return 0;
	322	}
	323
	324	static int inet6_pton(struct net net, const char src, u16 port_num,
	325	struct sockaddr_storage *addr)
	326	{
	327	struct sockaddr_in6 addr6 = (struct sockaddr_in6 )addr;
	328	const char *scope_delim;
	329	int srclen = strlen(src);
	330
	331	if (srclen > INET6_ADDRSTRLEN)
	332	return -EINVAL;
	333
	334	if (in6_pton(src, srclen, (u8 *)&addr6->sin6_addr.s6_addr,
	335	'%', &scope_delim) == 0)
	336	return -EINVAL;
	337
	338	if (ipv6_addr_type(&addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL &&
	339	src + srclen != scope_delim && *scope_delim == '%') {
	340	struct net_device *dev;
	341	char scope_id[16];
a88086e0	342	size_t scope_len = min_t(size_t, sizeof(scope_id) - 1,
b1a951fe SG	343	src + srclen - scope_delim - 1);
	344
	345	memcpy(scope_id, scope_delim + 1, scope_len);
	346	scope_id[scope_len] = '\0';
	347
	348	dev = dev_get_by_name(net, scope_id);
	349	if (dev) {
	350	addr6->sin6_scope_id = dev->ifindex;
	351	dev_put(dev);
	352	} else if (kstrtouint(scope_id, 0, &addr6->sin6_scope_id)) {
	353	return -EINVAL;
	354	}
	355	}
	356
	357	addr6->sin6_family = AF_INET6;
	358	addr6->sin6_port = htons(port_num);
	359
	360	return 0;
	361	}
	362
	363	/**
	364	* inet_pton_with_scope - convert an IPv4/IPv6 and port to socket address
	365	* @net: net namespace (used for scope handling)
	366	* @af: address family, AF_INET, AF_INET6 or AF_UNSPEC for either
	367	* @src: the start of the address string
	368	* @port: the start of the port string (or NULL for none)
	369	* @addr: output socket address
	370	*
	371	* Return zero on success, return errno when any error occurs.
	372	*/
	373	int inet_pton_with_scope(struct net *net, __kernel_sa_family_t af,
	374	const char src, const char port, struct sockaddr_storage *addr)
	375	{
	376	u16 port_num;
	377	int ret = -EINVAL;
	378
	379	if (port) {
	380	if (kstrtou16(port, 0, &port_num))
	381	return -EINVAL;
	382	} else {
	383	port_num = 0;
	384	}
	385
	386	switch (af) {
	387	case AF_INET:
	388	ret = inet4_pton(src, port_num, addr);
	389	break;
	390	case AF_INET6:
	391	ret = inet6_pton(net, src, port_num, addr);
	392	break;
	393	case AF_UNSPEC:
	394	ret = inet4_pton(src, port_num, addr);
	395	if (ret)
	396	ret = inet6_pton(net, src, port_num, addr);
	397	break;
	398	default:
	399	pr_err("unexpected address family %d\n", af);
	400	};
	401
	402	return ret;
	403	}
	404	EXPORT_SYMBOL(inet_pton_with_scope);
	405
a99a00cf	406	void inet_proto_csum_replace4(__sum16 sum, struct sk_buff skb,
4b048d6d	407	__be32 from, __be32 to, bool pseudohdr)
a99a00cf	408	{
a99a00cf	409	if (skb->ip_summed != CHECKSUM_PARTIAL) {
05c98543	410	csum_replace4(sum, from, to);
a99a00cf	411	if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
05c98543 ED	412	skb->csum = ~csum_add(csum_sub(~(skb->csum),
	413	(__force __wsum)from),
	414	(__force __wsum)to);
a99a00cf	415	} else if (pseudohdr)
05c98543 ED	416	sum = ~csum_fold(csum_add(csum_sub(csum_unfold(sum),
	417	(__force __wsum)from),
	418	(__force __wsum)to));
a99a00cf PM	419	}
a99a00cf PM	420	EXPORT_SYMBOL(inet_proto_csum_replace4);
4940fc88	421
2cf545e8 PM	422	void inet_proto_csum_replace16(__sum16 sum, struct sk_buff skb,
2cf545e8 PM	423	const __be32 from, const __be32 to,
4b048d6d	424	bool pseudohdr)
2cf545e8 PM	425	{
	426	__be32 diff[] = {
	427	~from[0], ~from[1], ~from[2], ~from[3],
	428	to[0], to[1], to[2], to[3],
	429	};
	430	if (skb->ip_summed != CHECKSUM_PARTIAL) {
	431	*sum = csum_fold(csum_partial(diff, sizeof(diff),
	432	~csum_unfold(*sum)));
	433	if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
	434	skb->csum = ~csum_partial(diff, sizeof(diff),
	435	~skb->csum);
	436	} else if (pseudohdr)
	437	*sum = ~csum_fold(csum_partial(diff, sizeof(diff),
	438	csum_unfold(*sum)));
	439	}
	440	EXPORT_SYMBOL(inet_proto_csum_replace16);
a48e4292	441
abc5d1ff TH	442	void inet_proto_csum_replace_by_diff(__sum16 sum, struct sk_buff skb,
	443	__wsum diff, bool pseudohdr)
	444	{
	445	if (skb->ip_summed != CHECKSUM_PARTIAL) {
	446	sum = csum_fold(csum_add(diff, ~csum_unfold(sum)));
	447	if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
	448	skb->csum = ~csum_add(diff, ~skb->csum);
	449	} else if (pseudohdr) {
	450	sum = ~csum_fold(csum_add(diff, csum_unfold(sum)));
	451	}
	452	}
	453	EXPORT_SYMBOL(inet_proto_csum_replace_by_diff);