[linux-2.6-block.git] / fs / nfsd / nfs4idmap.c

/*
 *  Mapping of UID/GIDs to name and vice versa.
 *
 *  Copyright (c) 2002, 2003 The Regents of the University of
 *  Michigan.  All rights reserved.
 *
 *  Marius Aamodt Eriksen <marius@umich.edu>
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/sunrpc/svc_xprt.h>
#include <net/net_namespace.h>
#include "idmap.h"
#include "nfsd.h"
#include "netns.h"

/*
 * Turn off idmapping when using AUTH_SYS.
 */
static bool nfs4_disable_idmapping = true;
module_param(nfs4_disable_idmapping, bool, 0644);
MODULE_PARM_DESC(nfs4_disable_idmapping,
		"Turn off server's NFSv4 idmapping when using 'sec=sys'");

/*
 * Cache entry
 */

/*
 * XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on
 * that.
 */

#define IDMAP_TYPE_USER  0
#define IDMAP_TYPE_GROUP 1

struct ent {
	struct cache_head h;
	int               type;		       /* User / Group */
	u32               id;
	char              name[IDMAP_NAMESZ];
	char              authname[IDMAP_NAMESZ];
};

/* Common entry handling */

#define ENT_HASHBITS          8
#define ENT_HASHMAX           (1 << ENT_HASHBITS)

static void
ent_init(struct cache_head *cnew, struct cache_head *citm)
{
	struct ent *new = container_of(cnew, struct ent, h);
	struct ent *itm = container_of(citm, struct ent, h);

	new->id = itm->id;
	new->type = itm->type;

	strlcpy(new->name, itm->name, sizeof(new->name));
	strlcpy(new->authname, itm->authname, sizeof(new->name));
}

static void
ent_put(struct kref *ref)
{
	struct ent *map = container_of(ref, struct ent, h.ref);
	kfree(map);
}

static struct cache_head *
ent_alloc(void)
{
	struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL);
	if (e)
		return &e->h;
	else
		return NULL;
}

/*
 * ID -> Name cache
 */

static uint32_t
idtoname_hash(struct ent *ent)
{
	uint32_t hash;

	hash = hash_str(ent->authname, ENT_HASHBITS);
	hash = hash_long(hash ^ ent->id, ENT_HASHBITS);

	/* Flip LSB for user/group */
	if (ent->type == IDMAP_TYPE_GROUP)
		hash ^= 1;

	return hash;
}

static void
idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
    int *blen)
{
 	struct ent *ent = container_of(ch, struct ent, h);
	char idstr[11];

	qword_add(bpp, blen, ent->authname);
	snprintf(idstr, sizeof(idstr), "%u", ent->id);
	qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
	qword_add(bpp, blen, idstr);

	(*bpp)[-1] = '\n';
}

static int
idtoname_match(struct cache_head *ca, struct cache_head *cb)
{
	struct ent *a = container_of(ca, struct ent, h);
	struct ent *b = container_of(cb, struct ent, h);

	return (a->id == b->id && a->type == b->type &&
	    strcmp(a->authname, b->authname) == 0);
}

static int
idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
{
	struct ent *ent;

	if (h == NULL) {
		seq_puts(m, "#domain type id [name]\n");
		return 0;
	}
	ent = container_of(h, struct ent, h);
	seq_printf(m, "%s %s %u", ent->authname,
			ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
			ent->id);
	if (test_bit(CACHE_VALID, &h->flags))
		seq_printf(m, " %s", ent->name);
	seq_printf(m, "\n");
	return 0;
}

static void
warn_no_idmapd(struct cache_detail *detail, int has_died)
{
	printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
			has_died ? "died" : "not been started");
}


static int         idtoname_parse(struct cache_detail *, char *, int);
static struct ent *idtoname_lookup(struct cache_detail *, struct ent *);
static struct ent *idtoname_update(struct cache_detail *, struct ent *,
				   struct ent *);

static struct cache_detail idtoname_cache_template = {
	.owner		= THIS_MODULE,
	.hash_size	= ENT_HASHMAX,
	.name		= "nfs4.idtoname",
	.cache_put	= ent_put,
	.cache_request	= idtoname_request,
	.cache_parse	= idtoname_parse,
	.cache_show	= idtoname_show,
	.warn_no_listener = warn_no_idmapd,
	.match		= idtoname_match,
	.init		= ent_init,
	.update		= ent_init,
	.alloc		= ent_alloc,
};

static int
idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
{
	struct ent ent, *res;
	char *buf1, *bp;
	int len;
	int error = -EINVAL;

	if (buf[buflen - 1] != '\n')
		return (-EINVAL);
	buf[buflen - 1]= '\0';

	buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (buf1 == NULL)
		return (-ENOMEM);

	memset(&ent, 0, sizeof(ent));

	/* Authentication name */
	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
		goto out;
	memcpy(ent.authname, buf1, sizeof(ent.authname));

	/* Type */
	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
		goto out;
	ent.type = strcmp(buf1, "user") == 0 ?
		IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;

	/* ID */
	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
		goto out;
	ent.id = simple_strtoul(buf1, &bp, 10);
	if (bp == buf1)
		goto out;

	/* expiry */
	ent.h.expiry_time = get_expiry(&buf);
	if (ent.h.expiry_time == 0)
		goto out;

	error = -ENOMEM;
	res = idtoname_lookup(cd, &ent);
	if (!res)
		goto out;

	/* Name */
	error = -EINVAL;
	len = qword_get(&buf, buf1, PAGE_SIZE);
	if (len < 0)
		goto out;
	if (len == 0)
		set_bit(CACHE_NEGATIVE, &ent.h.flags);
	else if (len >= IDMAP_NAMESZ)
		goto out;
	else
		memcpy(ent.name, buf1, sizeof(ent.name));
	error = -ENOMEM;
	res = idtoname_update(cd, &ent, res);
	if (res == NULL)
		goto out;

	cache_put(&res->h, cd);

	error = 0;
out:
	kfree(buf1);

	return error;
}


static struct ent *
idtoname_lookup(struct cache_detail *cd, struct ent *item)
{
	struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
						    idtoname_hash(item));
	if (ch)
		return container_of(ch, struct ent, h);
	else
		return NULL;
}

static struct ent *
idtoname_update(struct cache_detail *cd, struct ent *new, struct ent *old)
{
	struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
						    idtoname_hash(new));
	if (ch)
		return container_of(ch, struct ent, h);
	else
		return NULL;
}


/*
 * Name -> ID cache
 */

static inline int
nametoid_hash(struct ent *ent)
{
	return hash_str(ent->name, ENT_HASHBITS);
}

static void
nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
    int *blen)
{
 	struct ent *ent = container_of(ch, struct ent, h);

	qword_add(bpp, blen, ent->authname);
	qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
	qword_add(bpp, blen, ent->name);

	(*bpp)[-1] = '\n';
}

static int
nametoid_match(struct cache_head *ca, struct cache_head *cb)
{
	struct ent *a = container_of(ca, struct ent, h);
	struct ent *b = container_of(cb, struct ent, h);

	return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
	    strcmp(a->authname, b->authname) == 0);
}

static int
nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
{
	struct ent *ent;

	if (h == NULL) {
		seq_puts(m, "#domain type name [id]\n");
		return 0;
	}
	ent = container_of(h, struct ent, h);
	seq_printf(m, "%s %s %s", ent->authname,
			ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
			ent->name);
	if (test_bit(CACHE_VALID, &h->flags))
		seq_printf(m, " %u", ent->id);
	seq_printf(m, "\n");
	return 0;
}

static struct ent *nametoid_lookup(struct cache_detail *, struct ent *);
static struct ent *nametoid_update(struct cache_detail *, struct ent *,
				   struct ent *);
static int         nametoid_parse(struct cache_detail *, char *, int);

static struct cache_detail nametoid_cache_template = {
	.owner		= THIS_MODULE,
	.hash_size	= ENT_HASHMAX,
	.name		= "nfs4.nametoid",
	.cache_put	= ent_put,
	.cache_request	= nametoid_request,
	.cache_parse	= nametoid_parse,
	.cache_show	= nametoid_show,
	.warn_no_listener = warn_no_idmapd,
	.match		= nametoid_match,
	.init		= ent_init,
	.update		= ent_init,
	.alloc		= ent_alloc,
};

static int
nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
{
	struct ent ent, *res;
	char *buf1;
	int error = -EINVAL;

	if (buf[buflen - 1] != '\n')
		return (-EINVAL);
	buf[buflen - 1]= '\0';

	buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (buf1 == NULL)
		return (-ENOMEM);

	memset(&ent, 0, sizeof(ent));

	/* Authentication name */
	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
		goto out;
	memcpy(ent.authname, buf1, sizeof(ent.authname));

	/* Type */
	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
		goto out;
	ent.type = strcmp(buf1, "user") == 0 ?
		IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;

	/* Name */
	error = qword_get(&buf, buf1, PAGE_SIZE);
	if (error <= 0 || error >= IDMAP_NAMESZ)
		goto out;
	memcpy(ent.name, buf1, sizeof(ent.name));

	/* expiry */
	ent.h.expiry_time = get_expiry(&buf);
	if (ent.h.expiry_time == 0)
		goto out;

	/* ID */
	error = get_int(&buf, &ent.id);
	if (error == -EINVAL)
		goto out;
	if (error == -ENOENT)
		set_bit(CACHE_NEGATIVE, &ent.h.flags);

	error = -ENOMEM;
	res = nametoid_lookup(cd, &ent);
	if (res == NULL)
		goto out;
	res = nametoid_update(cd, &ent, res);
	if (res == NULL)
		goto out;

	cache_put(&res->h, cd);
	error = 0;
out:
	kfree(buf1);

	return (error);
}


static struct ent *
nametoid_lookup(struct cache_detail *cd, struct ent *item)
{
	struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
						    nametoid_hash(item));
	if (ch)
		return container_of(ch, struct ent, h);
	else
		return NULL;
}

static struct ent *
nametoid_update(struct cache_detail *cd, struct ent *new, struct ent *old)
{
	struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
						    nametoid_hash(new));
	if (ch)
		return container_of(ch, struct ent, h);
	else
		return NULL;
}

/*
 * Exported API
 */

int
nfsd_idmap_init(struct net *net)
{
	int rv;
	struct nfsd_net *nn = net_generic(net, nfsd_net_id);

	nn->idtoname_cache = cache_create_net(&idtoname_cache_template, net);
	if (IS_ERR(nn->idtoname_cache))
		return PTR_ERR(nn->idtoname_cache);
	rv = cache_register_net(nn->idtoname_cache, net);
	if (rv)
		goto destroy_idtoname_cache;
	nn->nametoid_cache = cache_create_net(&nametoid_cache_template, net);
	if (IS_ERR(nn->nametoid_cache)) {
		rv = PTR_ERR(nn->nametoid_cache);
		goto unregister_idtoname_cache;
	}
	rv = cache_register_net(nn->nametoid_cache, net);
	if (rv)
		goto destroy_nametoid_cache;
	return 0;

destroy_nametoid_cache:
	cache_destroy_net(nn->nametoid_cache, net);
unregister_idtoname_cache:
	cache_unregister_net(nn->idtoname_cache, net);
destroy_idtoname_cache:
	cache_destroy_net(nn->idtoname_cache, net);
	return rv;
}

void
nfsd_idmap_shutdown(struct net *net)
{
	struct nfsd_net *nn = net_generic(net, nfsd_net_id);

	cache_unregister_net(nn->idtoname_cache, net);
	cache_unregister_net(nn->nametoid_cache, net);
	cache_destroy_net(nn->idtoname_cache, net);
	cache_destroy_net(nn->nametoid_cache, net);
}

static int
idmap_lookup(struct svc_rqst *rqstp,
		struct ent *(*lookup_fn)(struct cache_detail *, struct ent *),
		struct ent *key, struct cache_detail *detail, struct ent **item)
{
	int ret;

	*item = lookup_fn(detail, key);
	if (!*item)
		return -ENOMEM;
 retry:
	ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle);

	if (ret == -ETIMEDOUT) {
		struct ent *prev_item = *item;
		*item = lookup_fn(detail, key);
		if (*item != prev_item)
			goto retry;
		cache_put(&(*item)->h, detail);
	}
	return ret;
}

static char *
rqst_authname(struct svc_rqst *rqstp)
{
	struct auth_domain *clp;

	clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client;
	return clp->name;
}

static __be32
idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen,
		u32 *id)
{
	struct ent *item, key = {
		.type = type,
	};
	int ret;
	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);

	if (namelen + 1 > sizeof(key.name))
		return nfserr_badowner;
	memcpy(key.name, name, namelen);
	key.name[namelen] = '\0';
	strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
	ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item);
	if (ret == -ENOENT)
		return nfserr_badowner;
	if (ret)
		return nfserrno(ret);
	*id = item->id;
	cache_put(&item->h, nn->nametoid_cache);
	return 0;
}

static __be32 encode_ascii_id(u32 id, __be32 **p, int *buflen)
{
	char buf[11];
	int len;
	int bytes;

	len = sprintf(buf, "%u", id);
	bytes = 4 + (XDR_QUADLEN(len) << 2);
	if (bytes > *buflen)
		return nfserr_resource;
	*p = xdr_encode_opaque(*p, buf, len);
	*buflen -= bytes;
	return 0;
}

static __be32 idmap_id_to_name(struct svc_rqst *rqstp, int type, u32 id, __be32 **p, int *buflen)
{
	struct ent *item, key = {
		.id = id,
		.type = type,
	};
	int ret;
	int bytes;
	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);

	strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
	ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item);
	if (ret == -ENOENT)
		return encode_ascii_id(id, p, buflen);
	if (ret)
		return nfserrno(ret);
	ret = strlen(item->name);
	WARN_ON_ONCE(ret > IDMAP_NAMESZ);
	bytes = 4 + (XDR_QUADLEN(ret) << 2);
	if (bytes > *buflen)
		return nfserr_resource;
	*p = xdr_encode_opaque(*p, item->name, ret);
	*buflen -= bytes;
	cache_put(&item->h, nn->idtoname_cache);
	return 0;
}

static bool
numeric_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
{
	int ret;
	char buf[11];

	if (namelen + 1 > sizeof(buf))
		/* too long to represent a 32-bit id: */
		return false;
	/* Just to make sure it's null-terminated: */
	memcpy(buf, name, namelen);
	buf[namelen] = '\0';
	ret = kstrtouint(buf, 10, id);
	return ret == 0;
}

static __be32
do_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
{
	if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
		if (numeric_name_to_id(rqstp, type, name, namelen, id))
			return 0;
		/*
		 * otherwise, fall through and try idmapping, for
		 * backwards compatibility with clients sending names:
		 */
	return idmap_name_to_id(rqstp, type, name, namelen, id);
}

static __be32 encode_name_from_id(struct svc_rqst *rqstp, int type, u32 id, __be32 **p, int *buflen)
{
	if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
		return encode_ascii_id(id, p, buflen);
	return idmap_id_to_name(rqstp, type, id, p, buflen);
}

__be32
nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
		kuid_t *uid)
{
	__be32 status;
	u32 id = -1;
	status = do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, &id);
	*uid = make_kuid(&init_user_ns, id);
	if (!uid_valid(*uid))
		status = nfserr_badowner;
	return status;
}

__be32
nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
		kgid_t *gid)
{
	__be32 status;
	u32 id = -1;
	status = do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, &id);
	*gid = make_kgid(&init_user_ns, id);
	if (!gid_valid(*gid))
		status = nfserr_badowner;
	return status;
}

__be32 nfsd4_encode_user(struct svc_rqst *rqstp, kuid_t uid,  __be32 **p, int *buflen)
{
	u32 id = from_kuid(&init_user_ns, uid);
	return encode_name_from_id(rqstp, IDMAP_TYPE_USER, id, p, buflen);
}

__be32 nfsd4_encode_group(struct svc_rqst *rqstp, kgid_t gid, __be32 **p, int *buflen)
{
	u32 id = from_kgid(&init_user_ns, gid);
	return encode_name_from_id(rqstp, IDMAP_TYPE_GROUP, id, p, buflen);
}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Mapping of UID/GIDs to name and vice versa.
	3	*
	4	* Copyright (c) 2002, 2003 The Regents of the University of
	5	* Michigan. All rights reserved.
	6	*
	7	* Marius Aamodt Eriksen <marius@umich.edu>
	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	*
	13	* 1. Redistributions of source code must retain the above copyright
	14	* notice, this list of conditions and the following disclaimer.
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in the
	17	* documentation and/or other materials provided with the distribution.
	18	* 3. Neither the name of the University nor the names of its
	19	* contributors may be used to endorse or promote products derived
	20	* from this software without specific prior written permission.
	21	*
	22	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	25	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	26	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	27	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	28	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	29	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	30	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	31	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	32	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	33	*/
	34
1da177e4	35	#include <linux/module.h>
1da177e4	36	#include <linux/seq_file.h>
341eb184	37	#include <linux/sched.h>
5a0e3ad6	38	#include <linux/slab.h>
c2e76ef5	39	#include <linux/sunrpc/svc_xprt.h>
f5c8593b	40	#include <net/net_namespace.h>
2ca72e17	41	#include "idmap.h"
3c726023	42	#include "nfsd.h"
c2e76ef5	43	#include "netns.h"
1da177e4	44
e9541ce8 BF	45	/*
	46	* Turn off idmapping when using AUTH_SYS.
	47	*/
	48	static bool nfs4_disable_idmapping = true;
	49	module_param(nfs4_disable_idmapping, bool, 0644);
	50	MODULE_PARM_DESC(nfs4_disable_idmapping,
	51	"Turn off server's NFSv4 idmapping when using 'sec=sys'");
	52
1da177e4 LT	53	/*
	54	* Cache entry
	55	*/
	56
	57	/*
	58	* XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on
	59	* that.
	60	*/
	61
	62	#define IDMAP_TYPE_USER 0
	63	#define IDMAP_TYPE_GROUP 1
	64
	65	struct ent {
	66	struct cache_head h;
	67	int type; /* User / Group */
b5663898	68	u32 id;
1da177e4 LT	69	char name[IDMAP_NAMESZ];
	70	char authname[IDMAP_NAMESZ];
	71	};
	72
1da177e4 LT	73	/* Common entry handling */
	74
	75	#define ENT_HASHBITS 8
	76	#define ENT_HASHMAX (1 << ENT_HASHBITS)
1da177e4	77
f9ecc921 N	78	static void
f9ecc921 N	79	ent_init(struct cache_head cnew, struct cache_head citm)
1da177e4	80	{
f9ecc921 N	81	struct ent *new = container_of(cnew, struct ent, h);
	82	struct ent *itm = container_of(citm, struct ent, h);
	83
1da177e4 LT	84	new->id = itm->id;
	85	new->type = itm->type;
	86
	87	strlcpy(new->name, itm->name, sizeof(new->name));
	88	strlcpy(new->authname, itm->authname, sizeof(new->name));
	89	}
	90
fd39ca9a	91	static void
baab935f	92	ent_put(struct kref *ref)
1da177e4	93	{
baab935f N	94	struct ent *map = container_of(ref, struct ent, h.ref);
baab935f N	95	kfree(map);
1da177e4 LT	96	}
1da177e4 LT	97
f9ecc921 N	98	static struct cache_head *
	99	ent_alloc(void)
	100	{
	101	struct ent e = kmalloc(sizeof(e), GFP_KERNEL);
	102	if (e)
	103	return &e->h;
	104	else
	105	return NULL;
	106	}
	107
1da177e4 LT	108	/*
	109	* ID -> Name cache
	110	*/
	111
1da177e4 LT	112	static uint32_t
	113	idtoname_hash(struct ent *ent)
	114	{
	115	uint32_t hash;
	116
	117	hash = hash_str(ent->authname, ENT_HASHBITS);
	118	hash = hash_long(hash ^ ent->id, ENT_HASHBITS);
	119
	120	/* Flip LSB for user/group */
	121	if (ent->type == IDMAP_TYPE_GROUP)
	122	hash ^= 1;
	123
	124	return hash;
	125	}
	126
	127	static void
	128	idtoname_request(struct cache_detail cd, struct cache_head ch, char **bpp,
	129	int *blen)
	130	{
	131	struct ent *ent = container_of(ch, struct ent, h);
	132	char idstr[11];
	133
	134	qword_add(bpp, blen, ent->authname);
0a725fc4	135	snprintf(idstr, sizeof(idstr), "%u", ent->id);
1da177e4 LT	136	qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
	137	qword_add(bpp, blen, idstr);
	138
	139	(*bpp)[-1] = '\n';
	140	}
	141
f9ecc921 N	142	static int
f9ecc921 N	143	idtoname_match(struct cache_head ca, struct cache_head cb)
1da177e4	144	{
f9ecc921 N	145	struct ent *a = container_of(ca, struct ent, h);
	146	struct ent *b = container_of(cb, struct ent, h);
	147
1da177e4 LT	148	return (a->id == b->id && a->type == b->type &&
	149	strcmp(a->authname, b->authname) == 0);
	150	}
	151
	152	static int
	153	idtoname_show(struct seq_file m, struct cache_detail cd, struct cache_head *h)
	154	{
	155	struct ent *ent;
	156
	157	if (h == NULL) {
	158	seq_puts(m, "#domain type id [name]\n");
	159	return 0;
	160	}
	161	ent = container_of(h, struct ent, h);
0a725fc4	162	seq_printf(m, "%s %s %u", ent->authname,
1da177e4 LT	163	ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
	164	ent->id);
	165	if (test_bit(CACHE_VALID, &h->flags))
	166	seq_printf(m, " %s", ent->name);
	167	seq_printf(m, "\n");
	168	return 0;
	169	}
	170
	171	static void
2da8ca26	172	warn_no_idmapd(struct cache_detail *detail, int has_died)
1da177e4 LT	173	{
1da177e4 LT	174	printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
2da8ca26	175	has_died ? "died" : "not been started");
1da177e4 LT	176	}
	177
	178
	179	static int idtoname_parse(struct cache_detail , char , int);
f890edbb SK	180	static struct ent idtoname_lookup(struct cache_detail , struct ent *);
	181	static struct ent idtoname_update(struct cache_detail , struct ent *,
	182	struct ent *);
1da177e4	183
c2e76ef5	184	static struct cache_detail idtoname_cache_template = {
f35279d3	185	.owner = THIS_MODULE,
1da177e4	186	.hash_size = ENT_HASHMAX,
1da177e4 LT	187	.name = "nfs4.idtoname",
1da177e4 LT	188	.cache_put = ent_put,
73fb847a	189	.cache_request = idtoname_request,
1da177e4 LT	190	.cache_parse = idtoname_parse,
	191	.cache_show = idtoname_show,
	192	.warn_no_listener = warn_no_idmapd,
f9ecc921 N	193	.match = idtoname_match,
	194	.init = ent_init,
	195	.update = ent_init,
	196	.alloc = ent_alloc,
1da177e4 LT	197	};
1da177e4 LT	198
a254b246	199	static int
1da177e4 LT	200	idtoname_parse(struct cache_detail cd, char buf, int buflen)
	201	{
	202	struct ent ent, *res;
	203	char buf1, bp;
c9b6cbe5	204	int len;
1da177e4 LT	205	int error = -EINVAL;
	206
	207	if (buf[buflen - 1] != '\n')
	208	return (-EINVAL);
	209	buf[buflen - 1]= '\0';
	210
	211	buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
	212	if (buf1 == NULL)
	213	return (-ENOMEM);
	214
	215	memset(&ent, 0, sizeof(ent));
	216
	217	/* Authentication name */
	218	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
	219	goto out;
	220	memcpy(ent.authname, buf1, sizeof(ent.authname));
	221
	222	/* Type */
	223	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
	224	goto out;
	225	ent.type = strcmp(buf1, "user") == 0 ?
	226	IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
	227
	228	/* ID */
	229	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
	230	goto out;
	231	ent.id = simple_strtoul(buf1, &bp, 10);
	232	if (bp == buf1)
	233	goto out;
	234
	235	/* expiry */
	236	ent.h.expiry_time = get_expiry(&buf);
	237	if (ent.h.expiry_time == 0)
	238	goto out;
	239
f9ecc921	240	error = -ENOMEM;
f890edbb	241	res = idtoname_lookup(cd, &ent);
f9ecc921 N	242	if (!res)
	243	goto out;
	244
1da177e4	245	/* Name */
c9b6cbe5 BF	246	error = -EINVAL;
	247	len = qword_get(&buf, buf1, PAGE_SIZE);
	248	if (len < 0)
1da177e4	249	goto out;
c9b6cbe5	250	if (len == 0)
1da177e4	251	set_bit(CACHE_NEGATIVE, &ent.h.flags);
d4395e03 BF	252	else if (len >= IDMAP_NAMESZ)
	253	goto out;
	254	else
1da177e4	255	memcpy(ent.name, buf1, sizeof(ent.name));
1da177e4	256	error = -ENOMEM;
f890edbb	257	res = idtoname_update(cd, &ent, res);
f9ecc921	258	if (res == NULL)
1da177e4 LT	259	goto out;
1da177e4 LT	260
f890edbb	261	cache_put(&res->h, cd);
1da177e4 LT	262
	263	error = 0;
	264	out:
	265	kfree(buf1);
	266
	267	return error;
	268	}
	269
f9ecc921 N	270
f9ecc921 N	271	static struct ent *
f890edbb	272	idtoname_lookup(struct cache_detail cd, struct ent item)
f9ecc921	273	{
f890edbb	274	struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
f9ecc921 N	275	idtoname_hash(item));
	276	if (ch)
	277	return container_of(ch, struct ent, h);
	278	else
	279	return NULL;
	280	}
	281
	282	static struct ent *
f890edbb	283	idtoname_update(struct cache_detail cd, struct ent new, struct ent *old)
f9ecc921	284	{
f890edbb	285	struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
f9ecc921 N	286	idtoname_hash(new));
	287	if (ch)
	288	return container_of(ch, struct ent, h);
	289	else
	290	return NULL;
	291	}
	292
1da177e4 LT	293
	294	/*
	295	* Name -> ID cache
	296	*/
	297
1da177e4 LT	298	static inline int
	299	nametoid_hash(struct ent *ent)
	300	{
	301	return hash_str(ent->name, ENT_HASHBITS);
	302	}
	303
fd39ca9a	304	static void
1da177e4 LT	305	nametoid_request(struct cache_detail cd, struct cache_head ch, char **bpp,
	306	int *blen)
	307	{
	308	struct ent *ent = container_of(ch, struct ent, h);
	309
	310	qword_add(bpp, blen, ent->authname);
	311	qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
	312	qword_add(bpp, blen, ent->name);
	313
	314	(*bpp)[-1] = '\n';
	315	}
	316
f9ecc921 N	317	static int
f9ecc921 N	318	nametoid_match(struct cache_head ca, struct cache_head cb)
1da177e4	319	{
f9ecc921 N	320	struct ent *a = container_of(ca, struct ent, h);
	321	struct ent *b = container_of(cb, struct ent, h);
	322
1da177e4 LT	323	return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
	324	strcmp(a->authname, b->authname) == 0);
	325	}
	326
	327	static int
	328	nametoid_show(struct seq_file m, struct cache_detail cd, struct cache_head *h)
	329	{
	330	struct ent *ent;
	331
	332	if (h == NULL) {
	333	seq_puts(m, "#domain type name [id]\n");
	334	return 0;
	335	}
	336	ent = container_of(h, struct ent, h);
	337	seq_printf(m, "%s %s %s", ent->authname,
	338	ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
	339	ent->name);
	340	if (test_bit(CACHE_VALID, &h->flags))
0a725fc4	341	seq_printf(m, " %u", ent->id);
1da177e4 LT	342	seq_printf(m, "\n");
	343	return 0;
	344	}
	345
f890edbb SK	346	static struct ent nametoid_lookup(struct cache_detail , struct ent *);
	347	static struct ent nametoid_update(struct cache_detail , struct ent *,
	348	struct ent *);
fd39ca9a	349	static int nametoid_parse(struct cache_detail , char , int);
1da177e4	350
9e75a4de	351	static struct cache_detail nametoid_cache_template = {
f35279d3	352	.owner = THIS_MODULE,
1da177e4	353	.hash_size = ENT_HASHMAX,
1da177e4 LT	354	.name = "nfs4.nametoid",
1da177e4 LT	355	.cache_put = ent_put,
73fb847a	356	.cache_request = nametoid_request,
1da177e4 LT	357	.cache_parse = nametoid_parse,
	358	.cache_show = nametoid_show,
	359	.warn_no_listener = warn_no_idmapd,
f9ecc921 N	360	.match = nametoid_match,
	361	.init = ent_init,
	362	.update = ent_init,
	363	.alloc = ent_alloc,
1da177e4 LT	364	};
1da177e4 LT	365
fd39ca9a	366	static int
1da177e4 LT	367	nametoid_parse(struct cache_detail cd, char buf, int buflen)
	368	{
	369	struct ent ent, *res;
	370	char *buf1;
	371	int error = -EINVAL;
	372
	373	if (buf[buflen - 1] != '\n')
	374	return (-EINVAL);
	375	buf[buflen - 1]= '\0';
	376
	377	buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
	378	if (buf1 == NULL)
	379	return (-ENOMEM);
	380
	381	memset(&ent, 0, sizeof(ent));
	382
	383	/* Authentication name */
	384	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
	385	goto out;
	386	memcpy(ent.authname, buf1, sizeof(ent.authname));
	387
	388	/* Type */
	389	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
	390	goto out;
	391	ent.type = strcmp(buf1, "user") == 0 ?
	392	IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
	393
	394	/* Name */
	395	error = qword_get(&buf, buf1, PAGE_SIZE);
	396	if (error <= 0 \|\| error >= IDMAP_NAMESZ)
	397	goto out;
	398	memcpy(ent.name, buf1, sizeof(ent.name));
	399
	400	/* expiry */
	401	ent.h.expiry_time = get_expiry(&buf);
	402	if (ent.h.expiry_time == 0)
	403	goto out;
	404
	405	/* ID */
	406	error = get_int(&buf, &ent.id);
	407	if (error == -EINVAL)
	408	goto out;
	409	if (error == -ENOENT)
	410	set_bit(CACHE_NEGATIVE, &ent.h.flags);
	411
	412	error = -ENOMEM;
f890edbb	413	res = nametoid_lookup(cd, &ent);
f9ecc921 N	414	if (res == NULL)
f9ecc921 N	415	goto out;
f890edbb	416	res = nametoid_update(cd, &ent, res);
f9ecc921	417	if (res == NULL)
1da177e4 LT	418	goto out;
1da177e4 LT	419
f890edbb	420	cache_put(&res->h, cd);
1da177e4 LT	421	error = 0;
	422	out:
	423	kfree(buf1);
	424
	425	return (error);
	426	}
	427
f9ecc921 N	428
f9ecc921 N	429	static struct ent *
f890edbb	430	nametoid_lookup(struct cache_detail cd, struct ent item)
f9ecc921	431	{
f890edbb	432	struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
f9ecc921 N	433	nametoid_hash(item));
	434	if (ch)
	435	return container_of(ch, struct ent, h);
	436	else
	437	return NULL;
	438	}
	439
	440	static struct ent *
f890edbb	441	nametoid_update(struct cache_detail cd, struct ent new, struct ent *old)
f9ecc921	442	{
f890edbb	443	struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
f9ecc921 N	444	nametoid_hash(new));
	445	if (ch)
	446	return container_of(ch, struct ent, h);
	447	else
	448	return NULL;
	449	}
1da177e4 LT	450
	451	/*
	452	* Exported API
	453	*/
	454
dbf847ec	455	int
43ec1a20	456	nfsd_idmap_init(struct net *net)
1da177e4	457	{
dbf847ec	458	int rv;
c2e76ef5	459	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
dbf847ec	460
c2e76ef5 SK	461	nn->idtoname_cache = cache_create_net(&idtoname_cache_template, net);
	462	if (IS_ERR(nn->idtoname_cache))
	463	return PTR_ERR(nn->idtoname_cache);
	464	rv = cache_register_net(nn->idtoname_cache, net);
dbf847ec	465	if (rv)
c2e76ef5	466	goto destroy_idtoname_cache;
9e75a4de SK	467	nn->nametoid_cache = cache_create_net(&nametoid_cache_template, net);
9e75a4de SK	468	if (IS_ERR(nn->nametoid_cache)) {
92566e28	469	rv = PTR_ERR(nn->nametoid_cache);
c2e76ef5	470	goto unregister_idtoname_cache;
9e75a4de SK	471	}
	472	rv = cache_register_net(nn->nametoid_cache, net);
	473	if (rv)
	474	goto destroy_nametoid_cache;
c2e76ef5 SK	475	return 0;
c2e76ef5 SK	476
9e75a4de SK	477	destroy_nametoid_cache:
9e75a4de SK	478	cache_destroy_net(nn->nametoid_cache, net);
c2e76ef5 SK	479	unregister_idtoname_cache:
	480	cache_unregister_net(nn->idtoname_cache, net);
	481	destroy_idtoname_cache:
	482	cache_destroy_net(nn->idtoname_cache, net);
dbf847ec	483	return rv;
1da177e4 LT	484	}
	485
	486	void
43ec1a20	487	nfsd_idmap_shutdown(struct net *net)
1da177e4	488	{
c2e76ef5 SK	489	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
	490
	491	cache_unregister_net(nn->idtoname_cache, net);
9e75a4de	492	cache_unregister_net(nn->nametoid_cache, net);
c2e76ef5	493	cache_destroy_net(nn->idtoname_cache, net);
9e75a4de	494	cache_destroy_net(nn->nametoid_cache, net);
1da177e4 LT	495	}
1da177e4 LT	496
1da177e4 LT	497	static int
1da177e4 LT	498	idmap_lookup(struct svc_rqst *rqstp,
f890edbb SK	499	struct ent (lookup_fn)(struct cache_detail , struct ent ),
f890edbb SK	500	struct ent key, struct cache_detail detail, struct ent **item)
1da177e4	501	{
1da177e4 LT	502	int ret;
1da177e4 LT	503
f890edbb	504	*item = lookup_fn(detail, key);
839049a8	505	if (!*item)
1da177e4	506	return -ENOMEM;
839049a8 N	507	retry:
	508	ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle);
	509
	510	if (ret == -ETIMEDOUT) {
	511	struct ent prev_item = item;
f890edbb	512	*item = lookup_fn(detail, key);
839049a8 N	513	if (*item != prev_item)
	514	goto retry;
	515	cache_put(&(*item)->h, detail);
1da177e4	516	}
1da177e4 LT	517	return ret;
	518	}
	519
3ab4d8b1 BF	520	static char *
	521	rqst_authname(struct svc_rqst *rqstp)
	522	{
	523	struct auth_domain *clp;
	524
	525	clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client;
	526	return clp->name;
	527	}
	528
3c726023	529	static __be32
1da177e4	530	idmap_name_to_id(struct svc_rqst rqstp, int type, const char name, u32 namelen,
b5663898	531	u32 *id)
1da177e4 LT	532	{
	533	struct ent *item, key = {
	534	.type = type,
	535	};
	536	int ret;
9695c705	537	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1da177e4 LT	538
1da177e4 LT	539	if (namelen + 1 > sizeof(key.name))
3c726023	540	return nfserr_badowner;
1da177e4 LT	541	memcpy(key.name, name, namelen);
1da177e4 LT	542	key.name[namelen] = '\0';
3ab4d8b1	543	strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
9e75a4de	544	ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item);
1da177e4	545	if (ret == -ENOENT)
3c726023	546	return nfserr_badowner;
1da177e4	547	if (ret)
3c726023	548	return nfserrno(ret);
1da177e4	549	*id = item->id;
9e75a4de	550	cache_put(&item->h, nn->nametoid_cache);
1da177e4 LT	551	return 0;
	552	}
	553
3554116d BF	554	static __be32 encode_ascii_id(u32 id, __be32 *p, int buflen)
	555	{
	556	char buf[11];
	557	int len;
	558	int bytes;
	559
	560	len = sprintf(buf, "%u", id);
	561	bytes = 4 + (XDR_QUADLEN(len) << 2);
	562	if (bytes > *buflen)
	563	return nfserr_resource;
	564	p = xdr_encode_opaque(p, buf, len);
	565	*buflen -= bytes;
	566	return 0;
	567	}
	568
	569	static __be32 idmap_id_to_name(struct svc_rqst rqstp, int type, u32 id, __be32 p, int buflen)
1da177e4 LT	570	{
	571	struct ent *item, key = {
	572	.id = id,
	573	.type = type,
	574	};
	575	int ret;
3554116d	576	int bytes;
9695c705	577	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1da177e4	578
3ab4d8b1	579	strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
c2e76ef5	580	ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item);
1da177e4	581	if (ret == -ENOENT)
3554116d	582	return encode_ascii_id(id, p, buflen);
1da177e4	583	if (ret)
3554116d	584	return nfserrno(ret);
1da177e4	585	ret = strlen(item->name);
3554116d BF	586	WARN_ON_ONCE(ret > IDMAP_NAMESZ);
	587	bytes = 4 + (XDR_QUADLEN(ret) << 2);
	588	if (bytes > *buflen)
	589	return nfserr_resource;
	590	p = xdr_encode_opaque(p, item->name, ret);
	591	*buflen -= bytes;
c2e76ef5	592	cache_put(&item->h, nn->idtoname_cache);
3554116d	593	return 0;
1da177e4 LT	594	}
1da177e4 LT	595
e9541ce8	596	static bool
b5663898	597	numeric_name_to_id(struct svc_rqst rqstp, int type, const char name, u32 namelen, u32 *id)
e9541ce8 BF	598	{
	599	int ret;
	600	char buf[11];
	601
	602	if (namelen + 1 > sizeof(buf))
	603	/* too long to represent a 32-bit id: */
	604	return false;
	605	/* Just to make sure it's null-terminated: */
	606	memcpy(buf, name, namelen);
	607	buf[namelen] = '\0';
9959ba0c	608	ret = kstrtouint(buf, 10, id);
e9541ce8 BF	609	return ret == 0;
	610	}
	611
	612	static __be32
b5663898	613	do_name_to_id(struct svc_rqst rqstp, int type, const char name, u32 namelen, u32 *id)
e9541ce8	614	{
d5497fc6	615	if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
e9541ce8 BF	616	if (numeric_name_to_id(rqstp, type, name, namelen, id))
	617	return 0;
	618	/*
	619	* otherwise, fall through and try idmapping, for
	620	* backwards compatibility with clients sending names:
	621	*/
	622	return idmap_name_to_id(rqstp, type, name, namelen, id);
	623	}
	624
3554116d	625	static __be32 encode_name_from_id(struct svc_rqst rqstp, int type, u32 id, __be32 p, int buflen)
e9541ce8	626	{
d5497fc6	627	if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
3554116d BF	628	return encode_ascii_id(id, p, buflen);
3554116d BF	629	return idmap_id_to_name(rqstp, type, id, p, buflen);
e9541ce8 BF	630	}
e9541ce8 BF	631
3c726023	632	__be32
1da177e4	633	nfsd_map_name_to_uid(struct svc_rqst rqstp, const char name, size_t namelen,
65e10f6d	634	kuid_t *uid)
1da177e4	635	{
65e10f6d EB	636	__be32 status;
	637	u32 id = -1;
	638	status = do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, &id);
	639	*uid = make_kuid(&init_user_ns, id);
	640	if (!uid_valid(*uid))
	641	status = nfserr_badowner;
	642	return status;
1da177e4 LT	643	}
1da177e4 LT	644
3c726023	645	__be32
1da177e4	646	nfsd_map_name_to_gid(struct svc_rqst rqstp, const char name, size_t namelen,
65e10f6d	647	kgid_t *gid)
1da177e4	648	{
65e10f6d EB	649	__be32 status;
	650	u32 id = -1;
	651	status = do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, &id);
	652	*gid = make_kgid(&init_user_ns, id);
	653	if (!gid_valid(*gid))
	654	status = nfserr_badowner;
	655	return status;
1da177e4 LT	656	}
1da177e4 LT	657
3554116d	658	__be32 nfsd4_encode_user(struct svc_rqst rqstp, kuid_t uid, __be32 p, int buflen)
1da177e4	659	{
65e10f6d	660	u32 id = from_kuid(&init_user_ns, uid);
3554116d	661	return encode_name_from_id(rqstp, IDMAP_TYPE_USER, id, p, buflen);
1da177e4 LT	662	}
1da177e4 LT	663
3554116d	664	__be32 nfsd4_encode_group(struct svc_rqst rqstp, kgid_t gid, __be32 p, int buflen)
1da177e4	665	{
65e10f6d	666	u32 id = from_kgid(&init_user_ns, gid);
3554116d	667	return encode_name_from_id(rqstp, IDMAP_TYPE_GROUP, id, p, buflen);
1da177e4	668	}