[linux.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 <[email protected]>
 *
 *  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 */
	len = qword_get(&buf, buf1, PAGE_SIZE);
	if (len <= 0 || len >= IDMAP_NAMESZ)
		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 || len >= IDMAP_NAMESZ)
		goto out;
	if (len == 0)
		set_bit(CACHE_NEGATIVE, &ent.h.flags);
	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 len, 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 */
	len = qword_get(&buf, buf1, PAGE_SIZE);
	if (len <= 0 || len >= IDMAP_NAMESZ)
		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 */
	len = qword_get(&buf, buf1, PAGE_SIZE);
	if (len <= 0 || len >= 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(struct xdr_stream *xdr, u32 id)
{
	char buf[11];
	int len;
	__be32 *p;

	len = sprintf(buf, "%u", id);
	p = xdr_reserve_space(xdr, len + 4);
	if (!p)
		return nfserr_resource;
	p = xdr_encode_opaque(p, buf, len);
	return 0;
}

static __be32 idmap_id_to_name(struct xdr_stream *xdr,
			       struct svc_rqst *rqstp, int type, u32 id)
{
	struct ent *item, key = {
		.id = id,
		.type = type,
	};
	__be32 *p;
	int ret;
	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(xdr, id);
	if (ret)
		return nfserrno(ret);
	ret = strlen(item->name);
	WARN_ON_ONCE(ret > IDMAP_NAMESZ);
	p = xdr_reserve_space(xdr, ret + 4);
	if (!p)
		return nfserr_resource;
	p = xdr_encode_opaque(p, item->name, ret);
	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 xdr_stream *xdr,
				  struct svc_rqst *rqstp, int type, u32 id)
{
	if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
		return encode_ascii_id(xdr, id);
	return idmap_id_to_name(xdr, rqstp, type, id);
}

__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 xdr_stream *xdr, struct svc_rqst *rqstp,
			 kuid_t uid)
{
	u32 id = from_kuid(&init_user_ns, uid);
	return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_USER, id);
}

__be32 nfsd4_encode_group(struct xdr_stream *xdr, struct svc_rqst *rqstp,
			  kgid_t gid)
{
	u32 id = from_kgid(&init_user_ns, gid);
	return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_GROUP, id);
}
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 <[email protected]>
	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 */
13c82e8e KM	218	len = qword_get(&buf, buf1, PAGE_SIZE);
13c82e8e KM	219	if (len <= 0 \|\| len >= IDMAP_NAMESZ)
1da177e4 LT	220	goto out;
	221	memcpy(ent.authname, buf1, sizeof(ent.authname));
	222
	223	/* Type */
	224	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
	225	goto out;
	226	ent.type = strcmp(buf1, "user") == 0 ?
	227	IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
	228
	229	/* ID */
	230	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
	231	goto out;
	232	ent.id = simple_strtoul(buf1, &bp, 10);
	233	if (bp == buf1)
	234	goto out;
	235
	236	/* expiry */
	237	ent.h.expiry_time = get_expiry(&buf);
	238	if (ent.h.expiry_time == 0)
	239	goto out;
	240
f9ecc921	241	error = -ENOMEM;
f890edbb	242	res = idtoname_lookup(cd, &ent);
f9ecc921 N	243	if (!res)
	244	goto out;
	245
1da177e4	246	/* Name */
c9b6cbe5 BF	247	error = -EINVAL;
c9b6cbe5 BF	248	len = qword_get(&buf, buf1, PAGE_SIZE);
13c82e8e	249	if (len < 0 \|\| len >= IDMAP_NAMESZ)
1da177e4	250	goto out;
c9b6cbe5	251	if (len == 0)
1da177e4	252	set_bit(CACHE_NEGATIVE, &ent.h.flags);
d4395e03	253	else
1da177e4	254	memcpy(ent.name, buf1, sizeof(ent.name));
1da177e4	255	error = -ENOMEM;
f890edbb	256	res = idtoname_update(cd, &ent, res);
f9ecc921	257	if (res == NULL)
1da177e4 LT	258	goto out;
1da177e4 LT	259
f890edbb	260	cache_put(&res->h, cd);
1da177e4 LT	261	error = 0;
	262	out:
	263	kfree(buf1);
1da177e4 LT	264	return error;
	265	}
	266
f9ecc921	267	static struct ent *
f890edbb	268	idtoname_lookup(struct cache_detail cd, struct ent item)
f9ecc921	269	{
f890edbb	270	struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
f9ecc921 N	271	idtoname_hash(item));
	272	if (ch)
	273	return container_of(ch, struct ent, h);
	274	else
	275	return NULL;
	276	}
	277
	278	static struct ent *
f890edbb	279	idtoname_update(struct cache_detail cd, struct ent new, struct ent *old)
f9ecc921	280	{
f890edbb	281	struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
f9ecc921 N	282	idtoname_hash(new));
	283	if (ch)
	284	return container_of(ch, struct ent, h);
	285	else
	286	return NULL;
	287	}
	288
1da177e4 LT	289
	290	/*
	291	* Name -> ID cache
	292	*/
	293
1da177e4 LT	294	static inline int
	295	nametoid_hash(struct ent *ent)
	296	{
	297	return hash_str(ent->name, ENT_HASHBITS);
	298	}
	299
fd39ca9a	300	static void
1da177e4 LT	301	nametoid_request(struct cache_detail cd, struct cache_head ch, char **bpp,
	302	int *blen)
	303	{
	304	struct ent *ent = container_of(ch, struct ent, h);
	305
	306	qword_add(bpp, blen, ent->authname);
	307	qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
	308	qword_add(bpp, blen, ent->name);
	309
	310	(*bpp)[-1] = '\n';
	311	}
	312
f9ecc921 N	313	static int
f9ecc921 N	314	nametoid_match(struct cache_head ca, struct cache_head cb)
1da177e4	315	{
f9ecc921 N	316	struct ent *a = container_of(ca, struct ent, h);
	317	struct ent *b = container_of(cb, struct ent, h);
	318
1da177e4 LT	319	return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
	320	strcmp(a->authname, b->authname) == 0);
	321	}
	322
	323	static int
	324	nametoid_show(struct seq_file m, struct cache_detail cd, struct cache_head *h)
	325	{
	326	struct ent *ent;
	327
	328	if (h == NULL) {
	329	seq_puts(m, "#domain type name [id]\n");
	330	return 0;
	331	}
	332	ent = container_of(h, struct ent, h);
	333	seq_printf(m, "%s %s %s", ent->authname,
	334	ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
	335	ent->name);
	336	if (test_bit(CACHE_VALID, &h->flags))
0a725fc4	337	seq_printf(m, " %u", ent->id);
1da177e4 LT	338	seq_printf(m, "\n");
	339	return 0;
	340	}
	341
f890edbb SK	342	static struct ent nametoid_lookup(struct cache_detail , struct ent *);
	343	static struct ent nametoid_update(struct cache_detail , struct ent *,
	344	struct ent *);
fd39ca9a	345	static int nametoid_parse(struct cache_detail , char , int);
1da177e4	346
9e75a4de	347	static struct cache_detail nametoid_cache_template = {
f35279d3	348	.owner = THIS_MODULE,
1da177e4	349	.hash_size = ENT_HASHMAX,
1da177e4 LT	350	.name = "nfs4.nametoid",
1da177e4 LT	351	.cache_put = ent_put,
73fb847a	352	.cache_request = nametoid_request,
1da177e4 LT	353	.cache_parse = nametoid_parse,
	354	.cache_show = nametoid_show,
	355	.warn_no_listener = warn_no_idmapd,
f9ecc921 N	356	.match = nametoid_match,
	357	.init = ent_init,
	358	.update = ent_init,
	359	.alloc = ent_alloc,
1da177e4 LT	360	};
1da177e4 LT	361
fd39ca9a	362	static int
1da177e4 LT	363	nametoid_parse(struct cache_detail cd, char buf, int buflen)
	364	{
	365	struct ent ent, *res;
	366	char *buf1;
48c348b0	367	int len, error = -EINVAL;
1da177e4 LT	368
	369	if (buf[buflen - 1] != '\n')
	370	return (-EINVAL);
	371	buf[buflen - 1]= '\0';
	372
	373	buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
	374	if (buf1 == NULL)
	375	return (-ENOMEM);
	376
	377	memset(&ent, 0, sizeof(ent));
	378
	379	/* Authentication name */
13c82e8e KM	380	len = qword_get(&buf, buf1, PAGE_SIZE);
13c82e8e KM	381	if (len <= 0 \|\| len >= IDMAP_NAMESZ)
1da177e4 LT	382	goto out;
	383	memcpy(ent.authname, buf1, sizeof(ent.authname));
	384
	385	/* Type */
	386	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
	387	goto out;
	388	ent.type = strcmp(buf1, "user") == 0 ?
	389	IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
	390
	391	/* Name */
48c348b0 KM	392	len = qword_get(&buf, buf1, PAGE_SIZE);
48c348b0 KM	393	if (len <= 0 \|\| len >= IDMAP_NAMESZ)
1da177e4 LT	394	goto out;
	395	memcpy(ent.name, buf1, sizeof(ent.name));
	396
	397	/* expiry */
	398	ent.h.expiry_time = get_expiry(&buf);
	399	if (ent.h.expiry_time == 0)
	400	goto out;
	401
	402	/* ID */
	403	error = get_int(&buf, &ent.id);
	404	if (error == -EINVAL)
	405	goto out;
	406	if (error == -ENOENT)
	407	set_bit(CACHE_NEGATIVE, &ent.h.flags);
	408
	409	error = -ENOMEM;
f890edbb	410	res = nametoid_lookup(cd, &ent);
f9ecc921 N	411	if (res == NULL)
f9ecc921 N	412	goto out;
f890edbb	413	res = nametoid_update(cd, &ent, res);
f9ecc921	414	if (res == NULL)
1da177e4 LT	415	goto out;
1da177e4 LT	416
f890edbb	417	cache_put(&res->h, cd);
1da177e4 LT	418	error = 0;
	419	out:
	420	kfree(buf1);
1da177e4 LT	421	return (error);
	422	}
	423
f9ecc921 N	424
f9ecc921 N	425	static struct ent *
f890edbb	426	nametoid_lookup(struct cache_detail cd, struct ent item)
f9ecc921	427	{
f890edbb	428	struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
f9ecc921 N	429	nametoid_hash(item));
	430	if (ch)
	431	return container_of(ch, struct ent, h);
	432	else
	433	return NULL;
	434	}
	435
	436	static struct ent *
f890edbb	437	nametoid_update(struct cache_detail cd, struct ent new, struct ent *old)
f9ecc921	438	{
f890edbb	439	struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
f9ecc921 N	440	nametoid_hash(new));
	441	if (ch)
	442	return container_of(ch, struct ent, h);
	443	else
	444	return NULL;
	445	}
1da177e4 LT	446
	447	/*
	448	* Exported API
	449	*/
	450
dbf847ec	451	int
43ec1a20	452	nfsd_idmap_init(struct net *net)
1da177e4	453	{
dbf847ec	454	int rv;
c2e76ef5	455	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
dbf847ec	456
c2e76ef5 SK	457	nn->idtoname_cache = cache_create_net(&idtoname_cache_template, net);
	458	if (IS_ERR(nn->idtoname_cache))
	459	return PTR_ERR(nn->idtoname_cache);
	460	rv = cache_register_net(nn->idtoname_cache, net);
dbf847ec	461	if (rv)
c2e76ef5	462	goto destroy_idtoname_cache;
9e75a4de SK	463	nn->nametoid_cache = cache_create_net(&nametoid_cache_template, net);
9e75a4de SK	464	if (IS_ERR(nn->nametoid_cache)) {
92566e28	465	rv = PTR_ERR(nn->nametoid_cache);
c2e76ef5	466	goto unregister_idtoname_cache;
9e75a4de SK	467	}
	468	rv = cache_register_net(nn->nametoid_cache, net);
	469	if (rv)
	470	goto destroy_nametoid_cache;
c2e76ef5 SK	471	return 0;
c2e76ef5 SK	472
9e75a4de SK	473	destroy_nametoid_cache:
9e75a4de SK	474	cache_destroy_net(nn->nametoid_cache, net);
c2e76ef5 SK	475	unregister_idtoname_cache:
	476	cache_unregister_net(nn->idtoname_cache, net);
	477	destroy_idtoname_cache:
	478	cache_destroy_net(nn->idtoname_cache, net);
dbf847ec	479	return rv;
1da177e4 LT	480	}
	481
	482	void
43ec1a20	483	nfsd_idmap_shutdown(struct net *net)
1da177e4	484	{
c2e76ef5 SK	485	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
	486
	487	cache_unregister_net(nn->idtoname_cache, net);
9e75a4de	488	cache_unregister_net(nn->nametoid_cache, net);
c2e76ef5	489	cache_destroy_net(nn->idtoname_cache, net);
9e75a4de	490	cache_destroy_net(nn->nametoid_cache, net);
1da177e4 LT	491	}
1da177e4 LT	492
1da177e4 LT	493	static int
1da177e4 LT	494	idmap_lookup(struct svc_rqst *rqstp,
f890edbb SK	495	struct ent (lookup_fn)(struct cache_detail , struct ent ),
f890edbb SK	496	struct ent key, struct cache_detail detail, struct ent **item)
1da177e4	497	{
1da177e4 LT	498	int ret;
1da177e4 LT	499
f890edbb	500	*item = lookup_fn(detail, key);
839049a8	501	if (!*item)
1da177e4	502	return -ENOMEM;
839049a8 N	503	retry:
	504	ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle);
	505
	506	if (ret == -ETIMEDOUT) {
	507	struct ent prev_item = item;
f890edbb	508	*item = lookup_fn(detail, key);
839049a8 N	509	if (*item != prev_item)
	510	goto retry;
	511	cache_put(&(*item)->h, detail);
1da177e4	512	}
1da177e4 LT	513	return ret;
	514	}
	515
3ab4d8b1 BF	516	static char *
	517	rqst_authname(struct svc_rqst *rqstp)
	518	{
	519	struct auth_domain *clp;
	520
	521	clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client;
	522	return clp->name;
	523	}
	524
3c726023	525	static __be32
1da177e4	526	idmap_name_to_id(struct svc_rqst rqstp, int type, const char name, u32 namelen,
b5663898	527	u32 *id)
1da177e4 LT	528	{
	529	struct ent *item, key = {
	530	.type = type,
	531	};
	532	int ret;
9695c705	533	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1da177e4 LT	534
1da177e4 LT	535	if (namelen + 1 > sizeof(key.name))
3c726023	536	return nfserr_badowner;
1da177e4 LT	537	memcpy(key.name, name, namelen);
1da177e4 LT	538	key.name[namelen] = '\0';
3ab4d8b1	539	strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
9e75a4de	540	ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item);
1da177e4	541	if (ret == -ENOENT)
3c726023	542	return nfserr_badowner;
1da177e4	543	if (ret)
3c726023	544	return nfserrno(ret);
1da177e4	545	*id = item->id;
9e75a4de	546	cache_put(&item->h, nn->nametoid_cache);
1da177e4 LT	547	return 0;
	548	}
	549
ddd1ea56	550	static __be32 encode_ascii_id(struct xdr_stream *xdr, u32 id)
3554116d BF	551	{
	552	char buf[11];
	553	int len;
ddd1ea56	554	__be32 *p;
3554116d BF	555
3554116d BF	556	len = sprintf(buf, "%u", id);
ddd1ea56 BF	557	p = xdr_reserve_space(xdr, len + 4);
ddd1ea56 BF	558	if (!p)
3554116d	559	return nfserr_resource;
ddd1ea56	560	p = xdr_encode_opaque(p, buf, len);
3554116d BF	561	return 0;
	562	}
	563
ddd1ea56 BF	564	static __be32 idmap_id_to_name(struct xdr_stream *xdr,
ddd1ea56 BF	565	struct svc_rqst *rqstp, int type, u32 id)
1da177e4 LT	566	{
	567	struct ent *item, key = {
	568	.id = id,
	569	.type = type,
	570	};
ddd1ea56	571	__be32 *p;
1da177e4	572	int ret;
9695c705	573	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1da177e4	574
3ab4d8b1	575	strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
c2e76ef5	576	ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item);
1da177e4	577	if (ret == -ENOENT)
ddd1ea56	578	return encode_ascii_id(xdr, id);
1da177e4	579	if (ret)
3554116d	580	return nfserrno(ret);
1da177e4	581	ret = strlen(item->name);
3554116d	582	WARN_ON_ONCE(ret > IDMAP_NAMESZ);
ddd1ea56 BF	583	p = xdr_reserve_space(xdr, ret + 4);
ddd1ea56 BF	584	if (!p)
3554116d	585	return nfserr_resource;
ddd1ea56	586	p = xdr_encode_opaque(p, item->name, ret);
c2e76ef5	587	cache_put(&item->h, nn->idtoname_cache);
3554116d	588	return 0;
1da177e4 LT	589	}
1da177e4 LT	590
e9541ce8	591	static bool
b5663898	592	numeric_name_to_id(struct svc_rqst rqstp, int type, const char name, u32 namelen, u32 *id)
e9541ce8 BF	593	{
	594	int ret;
	595	char buf[11];
	596
	597	if (namelen + 1 > sizeof(buf))
	598	/* too long to represent a 32-bit id: */
	599	return false;
	600	/* Just to make sure it's null-terminated: */
	601	memcpy(buf, name, namelen);
	602	buf[namelen] = '\0';
9959ba0c	603	ret = kstrtouint(buf, 10, id);
e9541ce8 BF	604	return ret == 0;
	605	}
	606
	607	static __be32
b5663898	608	do_name_to_id(struct svc_rqst rqstp, int type, const char name, u32 namelen, u32 *id)
e9541ce8	609	{
d5497fc6	610	if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
e9541ce8 BF	611	if (numeric_name_to_id(rqstp, type, name, namelen, id))
	612	return 0;
	613	/*
	614	* otherwise, fall through and try idmapping, for
	615	* backwards compatibility with clients sending names:
	616	*/
	617	return idmap_name_to_id(rqstp, type, name, namelen, id);
	618	}
	619
ddd1ea56 BF	620	static __be32 encode_name_from_id(struct xdr_stream *xdr,
ddd1ea56 BF	621	struct svc_rqst *rqstp, int type, u32 id)
e9541ce8	622	{
d5497fc6	623	if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
ddd1ea56 BF	624	return encode_ascii_id(xdr, id);
ddd1ea56 BF	625	return idmap_id_to_name(xdr, rqstp, type, id);
e9541ce8 BF	626	}
e9541ce8 BF	627
3c726023	628	__be32
1da177e4	629	nfsd_map_name_to_uid(struct svc_rqst rqstp, const char name, size_t namelen,
65e10f6d	630	kuid_t *uid)
1da177e4	631	{
65e10f6d EB	632	__be32 status;
	633	u32 id = -1;
	634	status = do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, &id);
	635	*uid = make_kuid(&init_user_ns, id);
	636	if (!uid_valid(*uid))
	637	status = nfserr_badowner;
	638	return status;
1da177e4 LT	639	}
1da177e4 LT	640
3c726023	641	__be32
1da177e4	642	nfsd_map_name_to_gid(struct svc_rqst rqstp, const char name, size_t namelen,
65e10f6d	643	kgid_t *gid)
1da177e4	644	{
65e10f6d EB	645	__be32 status;
	646	u32 id = -1;
	647	status = do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, &id);
	648	*gid = make_kgid(&init_user_ns, id);
	649	if (!gid_valid(*gid))
	650	status = nfserr_badowner;
	651	return status;
1da177e4 LT	652	}
1da177e4 LT	653
ddd1ea56 BF	654	__be32 nfsd4_encode_user(struct xdr_stream xdr, struct svc_rqst rqstp,
ddd1ea56 BF	655	kuid_t uid)
1da177e4	656	{
65e10f6d	657	u32 id = from_kuid(&init_user_ns, uid);
ddd1ea56	658	return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_USER, id);
1da177e4 LT	659	}
1da177e4 LT	660
ddd1ea56 BF	661	__be32 nfsd4_encode_group(struct xdr_stream xdr, struct svc_rqst rqstp,
ddd1ea56 BF	662	kgid_t gid)
1da177e4	663	{
65e10f6d	664	u32 id = from_kgid(&init_user_ns, gid);
ddd1ea56	665	return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_GROUP, id);
1da177e4	666	}