[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / sunrpc / addr.c

/*
 * Copyright 2009, Oracle.  All rights reserved.
 *
 * Convert socket addresses to presentation addresses and universal
 * addresses, and vice versa.
 *
 * Universal addresses are introduced by RFC 1833 and further refined by
 * recent RFCs describing NFSv4.  The universal address format is part
 * of the external (network) interface provided by rpcbind version 3
 * and 4, and by NFSv4.  Such an address is a string containing a
 * presentation format IP address followed by a port number in
 * "hibyte.lobyte" format.
 *
 * IPv6 addresses can also include a scope ID, typically denoted by
 * a '%' followed by a device name or a non-negative integer.  Refer to
 * RFC 4291, Section 2.2 for details on IPv6 presentation formats.
 */

#include <net/ipv6.h>
#include <linux/sunrpc/clnt.h>
#include <linux/slab.h>
#include <linux/export.h>

#if IS_ENABLED(CONFIG_IPV6)

static size_t rpc_ntop6_noscopeid(const struct sockaddr *sap,
				  char *buf, const int buflen)
{
	const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
	const struct in6_addr *addr = &sin6->sin6_addr;

	/*
	 * RFC 4291, Section 2.2.2
	 *
	 * Shorthanded ANY address
	 */
	if (ipv6_addr_any(addr))
		return snprintf(buf, buflen, "::");

	/*
	 * RFC 4291, Section 2.2.2
	 *
	 * Shorthanded loopback address
	 */
	if (ipv6_addr_loopback(addr))
		return snprintf(buf, buflen, "::1");

	/*
	 * RFC 4291, Section 2.2.3
	 *
	 * Special presentation address format for mapped v4
	 * addresses.
	 */
	if (ipv6_addr_v4mapped(addr))
		return snprintf(buf, buflen, "::ffff:%pI4",
					&addr->s6_addr32[3]);

	/*
	 * RFC 4291, Section 2.2.1
	 */
	return snprintf(buf, buflen, "%pI6c", addr);
}

static size_t rpc_ntop6(const struct sockaddr *sap,
			char *buf, const size_t buflen)
{
	const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
	char scopebuf[IPV6_SCOPE_ID_LEN];
	size_t len;
	int rc;

	len = rpc_ntop6_noscopeid(sap, buf, buflen);
	if (unlikely(len == 0))
		return len;

	if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
		return len;
	if (sin6->sin6_scope_id == 0)
		return len;

	rc = snprintf(scopebuf, sizeof(scopebuf), "%c%u",
			IPV6_SCOPE_DELIMITER, sin6->sin6_scope_id);
	if (unlikely((size_t)rc > sizeof(scopebuf)))
		return 0;

	len += rc;
	if (unlikely(len > buflen))
		return 0;

	strcat(buf, scopebuf);
	return len;
}

#else	/* !IS_ENABLED(CONFIG_IPV6) */

static size_t rpc_ntop6_noscopeid(const struct sockaddr *sap,
				  char *buf, const int buflen)
{
	return 0;
}

static size_t rpc_ntop6(const struct sockaddr *sap,
			char *buf, const size_t buflen)
{
	return 0;
}

#endif	/* !IS_ENABLED(CONFIG_IPV6) */

static int rpc_ntop4(const struct sockaddr *sap,
		     char *buf, const size_t buflen)
{
	const struct sockaddr_in *sin = (struct sockaddr_in *)sap;

	return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
}

/**
 * rpc_ntop - construct a presentation address in @buf
 * @sap: socket address
 * @buf: construction area
 * @buflen: size of @buf, in bytes
 *
 * Plants a %NUL-terminated string in @buf and returns the length
 * of the string, excluding the %NUL.  Otherwise zero is returned.
 */
size_t rpc_ntop(const struct sockaddr *sap, char *buf, const size_t buflen)
{
	switch (sap->sa_family) {
	case AF_INET:
		return rpc_ntop4(sap, buf, buflen);
	case AF_INET6:
		return rpc_ntop6(sap, buf, buflen);
	}

	return 0;
}
EXPORT_SYMBOL_GPL(rpc_ntop);

static size_t rpc_pton4(const char *buf, const size_t buflen,
			struct sockaddr *sap, const size_t salen)
{
	struct sockaddr_in *sin = (struct sockaddr_in *)sap;
	u8 *addr = (u8 *)&sin->sin_addr.s_addr;

	if (buflen > INET_ADDRSTRLEN || salen < sizeof(struct sockaddr_in))
		return 0;

	memset(sap, 0, sizeof(struct sockaddr_in));

	if (in4_pton(buf, buflen, addr, '\0', NULL) == 0)
		return 0;

	sin->sin_family = AF_INET;
	return sizeof(struct sockaddr_in);
}

#if IS_ENABLED(CONFIG_IPV6)
static int rpc_parse_scope_id(const char *buf, const size_t buflen,
			      const char *delim, struct sockaddr_in6 *sin6)
{
	char *p;
	size_t len;

	if ((buf + buflen) == delim)
		return 1;

	if (*delim != IPV6_SCOPE_DELIMITER)
		return 0;

	if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
		return 0;

	len = (buf + buflen) - delim - 1;
	p = kstrndup(delim + 1, len, GFP_KERNEL);
	if (p) {
		unsigned long scope_id = 0;
		struct net_device *dev;

		dev = dev_get_by_name(&init_net, p);
		if (dev != NULL) {
			scope_id = dev->ifindex;
			dev_put(dev);
		} else {
			if (strict_strtoul(p, 10, &scope_id) == 0) {
				kfree(p);
				return 0;
			}
		}

		kfree(p);

		sin6->sin6_scope_id = scope_id;
		return 1;
	}

	return 0;
}

static size_t rpc_pton6(const char *buf, const size_t buflen,
			struct sockaddr *sap, const size_t salen)
{
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
	u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
	const char *delim;

	if (buflen > (INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN) ||
	    salen < sizeof(struct sockaddr_in6))
		return 0;

	memset(sap, 0, sizeof(struct sockaddr_in6));

	if (in6_pton(buf, buflen, addr, IPV6_SCOPE_DELIMITER, &delim) == 0)
		return 0;

	if (!rpc_parse_scope_id(buf, buflen, delim, sin6))
		return 0;

	sin6->sin6_family = AF_INET6;
	return sizeof(struct sockaddr_in6);
}
#else
static size_t rpc_pton6(const char *buf, const size_t buflen,
			struct sockaddr *sap, const size_t salen)
{
	return 0;
}
#endif

/**
 * rpc_pton - Construct a sockaddr in @sap
 * @buf: C string containing presentation format IP address
 * @buflen: length of presentation address in bytes
 * @sap: buffer into which to plant socket address
 * @salen: size of buffer in bytes
 *
 * Returns the size of the socket address if successful; otherwise
 * zero is returned.
 *
 * Plants a socket address in @sap and returns the size of the
 * socket address, if successful.  Returns zero if an error
 * occurred.
 */
size_t rpc_pton(const char *buf, const size_t buflen,
		struct sockaddr *sap, const size_t salen)
{
	unsigned int i;

	for (i = 0; i < buflen; i++)
		if (buf[i] == ':')
			return rpc_pton6(buf, buflen, sap, salen);
	return rpc_pton4(buf, buflen, sap, salen);
}
EXPORT_SYMBOL_GPL(rpc_pton);

/**
 * rpc_sockaddr2uaddr - Construct a universal address string from @sap.
 * @sap: socket address
 * @gfp_flags: allocation mode
 *
 * Returns a %NUL-terminated string in dynamically allocated memory;
 * otherwise NULL is returned if an error occurred.  Caller must
 * free the returned string.
 */
char *rpc_sockaddr2uaddr(const struct sockaddr *sap, gfp_t gfp_flags)
{
	char portbuf[RPCBIND_MAXUADDRPLEN];
	char addrbuf[RPCBIND_MAXUADDRLEN];
	unsigned short port;

	switch (sap->sa_family) {
	case AF_INET:
		if (rpc_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
			return NULL;
		port = ntohs(((struct sockaddr_in *)sap)->sin_port);
		break;
	case AF_INET6:
		if (rpc_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
			return NULL;
		port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
		break;
	default:
		return NULL;
	}

	if (snprintf(portbuf, sizeof(portbuf),
		     ".%u.%u", port >> 8, port & 0xff) > (int)sizeof(portbuf))
		return NULL;

	if (strlcat(addrbuf, portbuf, sizeof(addrbuf)) > sizeof(addrbuf))
		return NULL;

	return kstrdup(addrbuf, gfp_flags);
}

/**
 * rpc_uaddr2sockaddr - convert a universal address to a socket address.
 * @uaddr: C string containing universal address to convert
 * @uaddr_len: length of universal address string
 * @sap: buffer into which to plant socket address
 * @salen: size of buffer
 *
 * @uaddr does not have to be '\0'-terminated, but strict_strtoul() and
 * rpc_pton() require proper string termination to be successful.
 *
 * Returns the size of the socket address if successful; otherwise
 * zero is returned.
 */
size_t rpc_uaddr2sockaddr(const char *uaddr, const size_t uaddr_len,
			  struct sockaddr *sap, const size_t salen)
{
	char *c, buf[RPCBIND_MAXUADDRLEN + sizeof('\0')];
	unsigned long portlo, porthi;
	unsigned short port;

	if (uaddr_len > RPCBIND_MAXUADDRLEN)
		return 0;

	memcpy(buf, uaddr, uaddr_len);

	buf[uaddr_len] = '\0';
	c = strrchr(buf, '.');
	if (unlikely(c == NULL))
		return 0;
	if (unlikely(strict_strtoul(c + 1, 10, &portlo) != 0))
		return 0;
	if (unlikely(portlo > 255))
		return 0;

	*c = '\0';
	c = strrchr(buf, '.');
	if (unlikely(c == NULL))
		return 0;
	if (unlikely(strict_strtoul(c + 1, 10, &porthi) != 0))
		return 0;
	if (unlikely(porthi > 255))
		return 0;

	port = (unsigned short)((porthi << 8) | portlo);

	*c = '\0';
	if (rpc_pton(buf, strlen(buf), sap, salen) == 0)
		return 0;

	switch (sap->sa_family) {
	case AF_INET:
		((struct sockaddr_in *)sap)->sin_port = htons(port);
		return sizeof(struct sockaddr_in);
	case AF_INET6:
		((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
		return sizeof(struct sockaddr_in6);
	}

	return 0;
}
EXPORT_SYMBOL_GPL(rpc_uaddr2sockaddr);
Commit	Line	Data
a02d6926 CL	1	/*
	2	* Copyright 2009, Oracle. All rights reserved.
	3	*
	4	* Convert socket addresses to presentation addresses and universal
	5	* addresses, and vice versa.
	6	*
	7	* Universal addresses are introduced by RFC 1833 and further refined by
	8	* recent RFCs describing NFSv4. The universal address format is part
	9	* of the external (network) interface provided by rpcbind version 3
	10	* and 4, and by NFSv4. Such an address is a string containing a
	11	* presentation format IP address followed by a port number in
	12	* "hibyte.lobyte" format.
	13	*
	14	* IPv6 addresses can also include a scope ID, typically denoted by
	15	* a '%' followed by a device name or a non-negative integer. Refer to
	16	* RFC 4291, Section 2.2 for details on IPv6 presentation formats.
	17	*/
	18
	19	#include <net/ipv6.h>
	20	#include <linux/sunrpc/clnt.h>
5a0e3ad6	21	#include <linux/slab.h>
bc3b2d7f	22	#include <linux/export.h>
a02d6926	23
dfd56b8b	24	#if IS_ENABLED(CONFIG_IPV6)
a02d6926 CL	25
	26	static size_t rpc_ntop6_noscopeid(const struct sockaddr *sap,
	27	char *buf, const int buflen)
	28	{
	29	const struct sockaddr_in6 sin6 = (struct sockaddr_in6 )sap;
	30	const struct in6_addr *addr = &sin6->sin6_addr;
	31
	32	/*
	33	* RFC 4291, Section 2.2.2
	34	*
	35	* Shorthanded ANY address
	36	*/
	37	if (ipv6_addr_any(addr))
	38	return snprintf(buf, buflen, "::");
	39
	40	/*
	41	* RFC 4291, Section 2.2.2
	42	*
	43	* Shorthanded loopback address
	44	*/
	45	if (ipv6_addr_loopback(addr))
	46	return snprintf(buf, buflen, "::1");
	47
	48	/*
	49	* RFC 4291, Section 2.2.3
	50	*
	51	* Special presentation address format for mapped v4
	52	* addresses.
	53	*/
	54	if (ipv6_addr_v4mapped(addr))
	55	return snprintf(buf, buflen, "::ffff:%pI4",
	56	&addr->s6_addr32[3]);
	57
	58	/*
	59	* RFC 4291, Section 2.2.1
a02d6926	60	*/
dd1fd90f	61	return snprintf(buf, buflen, "%pI6c", addr);
a02d6926 CL	62	}
	63
	64	static size_t rpc_ntop6(const struct sockaddr *sap,
	65	char *buf, const size_t buflen)
	66	{
	67	const struct sockaddr_in6 sin6 = (struct sockaddr_in6 )sap;
	68	char scopebuf[IPV6_SCOPE_ID_LEN];
	69	size_t len;
	70	int rc;
	71
	72	len = rpc_ntop6_noscopeid(sap, buf, buflen);
	73	if (unlikely(len == 0))
	74	return len;
	75
f1a89a11	76	if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
a02d6926	77	return len;
7a88efe9 CL	78	if (sin6->sin6_scope_id == 0)
7a88efe9 CL	79	return len;
a02d6926 CL	80
	81	rc = snprintf(scopebuf, sizeof(scopebuf), "%c%u",
	82	IPV6_SCOPE_DELIMITER, sin6->sin6_scope_id);
	83	if (unlikely((size_t)rc > sizeof(scopebuf)))
	84	return 0;
	85
	86	len += rc;
	87	if (unlikely(len > buflen))
	88	return 0;
	89
	90	strcat(buf, scopebuf);
	91	return len;
	92	}
	93
dfd56b8b	94	#else /* !IS_ENABLED(CONFIG_IPV6) */
a02d6926 CL	95
	96	static size_t rpc_ntop6_noscopeid(const struct sockaddr *sap,
	97	char *buf, const int buflen)
	98	{
	99	return 0;
	100	}
	101
	102	static size_t rpc_ntop6(const struct sockaddr *sap,
	103	char *buf, const size_t buflen)
	104	{
	105	return 0;
	106	}
	107
dfd56b8b	108	#endif /* !IS_ENABLED(CONFIG_IPV6) */
a02d6926 CL	109
	110	static int rpc_ntop4(const struct sockaddr *sap,
	111	char *buf, const size_t buflen)
	112	{
	113	const struct sockaddr_in sin = (struct sockaddr_in )sap;
	114
	115	return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
	116	}
	117
	118	/**
	119	* rpc_ntop - construct a presentation address in @buf
	120	* @sap: socket address
	121	* @buf: construction area
	122	* @buflen: size of @buf, in bytes
	123	*
	124	* Plants a %NUL-terminated string in @buf and returns the length
	125	* of the string, excluding the %NUL. Otherwise zero is returned.
	126	*/
	127	size_t rpc_ntop(const struct sockaddr sap, char buf, const size_t buflen)
	128	{
	129	switch (sap->sa_family) {
	130	case AF_INET:
	131	return rpc_ntop4(sap, buf, buflen);
	132	case AF_INET6:
	133	return rpc_ntop6(sap, buf, buflen);
	134	}
	135
	136	return 0;
	137	}
	138	EXPORT_SYMBOL_GPL(rpc_ntop);
	139
	140	static size_t rpc_pton4(const char *buf, const size_t buflen,
	141	struct sockaddr *sap, const size_t salen)
	142	{
	143	struct sockaddr_in sin = (struct sockaddr_in )sap;
	144	u8 addr = (u8 )&sin->sin_addr.s_addr;
	145
	146	if (buflen > INET_ADDRSTRLEN \|\| salen < sizeof(struct sockaddr_in))
	147	return 0;
	148
	149	memset(sap, 0, sizeof(struct sockaddr_in));
	150
	151	if (in4_pton(buf, buflen, addr, '\0', NULL) == 0)
	152	return 0;
	153
	154	sin->sin_family = AF_INET;
6eab04a8	155	return sizeof(struct sockaddr_in);
a02d6926 CL	156	}
a02d6926 CL	157
dfd56b8b	158	#if IS_ENABLED(CONFIG_IPV6)
a02d6926 CL	159	static int rpc_parse_scope_id(const char *buf, const size_t buflen,
	160	const char delim, struct sockaddr_in6 sin6)
	161	{
	162	char *p;
	163	size_t len;
	164
	165	if ((buf + buflen) == delim)
	166	return 1;
	167
	168	if (*delim != IPV6_SCOPE_DELIMITER)
	169	return 0;
	170
f1a89a11	171	if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
a02d6926 CL	172	return 0;
	173
	174	len = (buf + buflen) - delim - 1;
	175	p = kstrndup(delim + 1, len, GFP_KERNEL);
	176	if (p) {
	177	unsigned long scope_id = 0;
	178	struct net_device *dev;
	179
	180	dev = dev_get_by_name(&init_net, p);
	181	if (dev != NULL) {
	182	scope_id = dev->ifindex;
	183	dev_put(dev);
	184	} else {
	185	if (strict_strtoul(p, 10, &scope_id) == 0) {
	186	kfree(p);
	187	return 0;
	188	}
	189	}
	190
	191	kfree(p);
	192
	193	sin6->sin6_scope_id = scope_id;
	194	return 1;
	195	}
	196
	197	return 0;
	198	}
	199
	200	static size_t rpc_pton6(const char *buf, const size_t buflen,
	201	struct sockaddr *sap, const size_t salen)
	202	{
	203	struct sockaddr_in6 sin6 = (struct sockaddr_in6 )sap;
	204	u8 addr = (u8 )&sin6->sin6_addr.in6_u;
	205	const char *delim;
	206
	207	if (buflen > (INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN) \|\|
	208	salen < sizeof(struct sockaddr_in6))
	209	return 0;
	210
	211	memset(sap, 0, sizeof(struct sockaddr_in6));
	212
	213	if (in6_pton(buf, buflen, addr, IPV6_SCOPE_DELIMITER, &delim) == 0)
	214	return 0;
	215
	216	if (!rpc_parse_scope_id(buf, buflen, delim, sin6))
	217	return 0;
	218
	219	sin6->sin6_family = AF_INET6;
	220	return sizeof(struct sockaddr_in6);
	221	}
	222	#else
	223	static size_t rpc_pton6(const char *buf, const size_t buflen,
	224	struct sockaddr *sap, const size_t salen)
	225	{
	226	return 0;
	227	}
	228	#endif
	229
	230	/**
	231	* rpc_pton - Construct a sockaddr in @sap
	232	* @buf: C string containing presentation format IP address
	233	* @buflen: length of presentation address in bytes
	234	* @sap: buffer into which to plant socket address
	235	* @salen: size of buffer in bytes
236	*
237	* Returns the size of the socket address if successful; otherwise
238	* zero is returned.
239	*
240	* Plants a socket address in @sap and returns the size of the
241	* socket address, if successful. Returns zero if an error
242	* occurred.
243	*/
244	size_t rpc_pton(const char *buf, const size_t buflen,
245	struct sockaddr *sap, const size_t salen)
246	{
247	unsigned int i;
248
249	for (i = 0; i < buflen; i++)
250	if (buf[i] == ':')
251	return rpc_pton6(buf, buflen, sap, salen);
252	return rpc_pton4(buf, buflen, sap, salen);
253	}
254	EXPORT_SYMBOL_GPL(rpc_pton);
255
256	/**
257	* rpc_sockaddr2uaddr - Construct a universal address string from @sap.
258	* @sap: socket address
d77385f2	259	* @gfp_flags: allocation mode
a02d6926 CL	260	*
	261	* Returns a %NUL-terminated string in dynamically allocated memory;
	262	* otherwise NULL is returned if an error occurred. Caller must
	263	* free the returned string.
	264	*/
d77385f2	265	char rpc_sockaddr2uaddr(const struct sockaddr sap, gfp_t gfp_flags)
a02d6926 CL	266	{
	267	char portbuf[RPCBIND_MAXUADDRPLEN];
	268	char addrbuf[RPCBIND_MAXUADDRLEN];
	269	unsigned short port;
	270
	271	switch (sap->sa_family) {
	272	case AF_INET:
	273	if (rpc_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
	274	return NULL;
	275	port = ntohs(((struct sockaddr_in *)sap)->sin_port);
	276	break;
	277	case AF_INET6:
	278	if (rpc_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
	279	return NULL;
	280	port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
	281	break;
	282	default:
	283	return NULL;
	284	}
	285
	286	if (snprintf(portbuf, sizeof(portbuf),
	287	".%u.%u", port >> 8, port & 0xff) > (int)sizeof(portbuf))
	288	return NULL;
	289
	290	if (strlcat(addrbuf, portbuf, sizeof(addrbuf)) > sizeof(addrbuf))
	291	return NULL;
	292
d77385f2	293	return kstrdup(addrbuf, gfp_flags);
a02d6926	294	}
a02d6926 CL	295
	296	/**
	297	* rpc_uaddr2sockaddr - convert a universal address to a socket address.
	298	* @uaddr: C string containing universal address to convert
	299	* @uaddr_len: length of universal address string
	300	* @sap: buffer into which to plant socket address
	301	* @salen: size of buffer
	302	*
1e360a60 CL	303	* @uaddr does not have to be '\0'-terminated, but strict_strtoul() and
	304	* rpc_pton() require proper string termination to be successful.
	305	*
a02d6926 CL	306	* Returns the size of the socket address if successful; otherwise
	307	* zero is returned.
	308	*/
	309	size_t rpc_uaddr2sockaddr(const char *uaddr, const size_t uaddr_len,
	310	struct sockaddr *sap, const size_t salen)
	311	{
1e360a60	312	char *c, buf[RPCBIND_MAXUADDRLEN + sizeof('\0')];
a02d6926 CL	313	unsigned long portlo, porthi;
	314	unsigned short port;
	315
1e360a60	316	if (uaddr_len > RPCBIND_MAXUADDRLEN)
a02d6926 CL	317	return 0;
	318
	319	memcpy(buf, uaddr, uaddr_len);
	320
1e360a60	321	buf[uaddr_len] = '\0';
a02d6926 CL	322	c = strrchr(buf, '.');
	323	if (unlikely(c == NULL))
	324	return 0;
	325	if (unlikely(strict_strtoul(c + 1, 10, &portlo) != 0))
	326	return 0;
	327	if (unlikely(portlo > 255))
	328	return 0;
	329
1e360a60	330	*c = '\0';
a02d6926 CL	331	c = strrchr(buf, '.');
	332	if (unlikely(c == NULL))
	333	return 0;
	334	if (unlikely(strict_strtoul(c + 1, 10, &porthi) != 0))
	335	return 0;
	336	if (unlikely(porthi > 255))
	337	return 0;
	338
	339	port = (unsigned short)((porthi << 8) \| portlo);
	340
1e360a60	341	*c = '\0';
a02d6926 CL	342	if (rpc_pton(buf, strlen(buf), sap, salen) == 0)
	343	return 0;
	344
	345	switch (sap->sa_family) {
	346	case AF_INET:
	347	((struct sockaddr_in *)sap)->sin_port = htons(port);
	348	return sizeof(struct sockaddr_in);
	349	case AF_INET6:
	350	((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
	351	return sizeof(struct sockaddr_in6);
	352	}
	353
	354	return 0;
	355	}
	356	EXPORT_SYMBOL_GPL(rpc_uaddr2sockaddr);