1 files changed, 792 insertions, 0 deletions

diff --git a/fs/nfs/nfs4idmap.c b/fs/nfs/nfs4idmap.c
new file mode 100644
index 000000000000..2e1737c40a29
--- /dev/null
+++ b/fs/nfs/nfs4idmap.c
@@ -0,0 +1,792 @@
+/*
+ * fs/nfs/idmap.c
+ *
+ *  UID and GID to name mapping for clients.
+ *
+ *  Copyright (c) 2002 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/types.h>
+#include <linux/parser.h>
+#include <linux/fs.h>
+#include <net/net_namespace.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+#include <linux/nfs_fs.h>
+#include <linux/nfs_fs_sb.h>
+#include <linux/key.h>
+#include <linux/keyctl.h>
+#include <linux/key-type.h>
+#include <keys/user-type.h>
+#include <linux/module.h>
+
+#include "internal.h"
+#include "netns.h"
+#include "nfs4idmap.h"
+#include "nfs4trace.h"
+
+#define NFS_UINT_MAXLEN 11
+
+static const struct cred *id_resolver_cache;
+static struct key_type key_type_id_resolver_legacy;
+
+struct idmap_legacy_upcalldata {
+        struct rpc_pipe_msg pipe_msg;
+        struct idmap_msg idmap_msg;
+        struct key_construction *key_cons;
+        struct idmap *idmap;
+};
+
+struct idmap {
+        struct rpc_pipe_dir_object idmap_pdo;
+        struct rpc_pipe         *idmap_pipe;
+        struct idmap_legacy_upcalldata *idmap_upcall_data;
+        struct mutex            idmap_mutex;
+};
+
+/**
+ * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
+ * @fattr: fully initialised struct nfs_fattr
+ * @owner_name: owner name string cache
+ * @group_name: group name string cache
+ */
+void nfs_fattr_init_names(struct nfs_fattr *fattr,
+                struct nfs4_string *owner_name,
+                struct nfs4_string *group_name)
+{
+        fattr->owner_name = owner_name;
+        fattr->group_name = group_name;
+}
+
+static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr)
+{
+        fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME;
+        kfree(fattr->owner_name->data);
+}
+
+static void nfs_fattr_free_group_name(struct nfs_fattr *fattr)
+{
+        fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME;
+        kfree(fattr->group_name->data);
+}
+
+static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr)
+{
+        struct nfs4_string *owner = fattr->owner_name;
+        kuid_t uid;
+
+        if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME))
+                return false;
+        if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) {
+                fattr->uid = uid;
+                fattr->valid |= NFS_ATTR_FATTR_OWNER;
+        }
+        return true;
+}
+
+static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr)
+{
+        struct nfs4_string *group = fattr->group_name;
+        kgid_t gid;
+
+        if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME))
+                return false;
+        if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) {
+                fattr->gid = gid;
+                fattr->valid |= NFS_ATTR_FATTR_GROUP;
+        }
+        return true;
+}
+
+/**
+ * nfs_fattr_free_names - free up the NFSv4 owner and group strings
+ * @fattr: a fully initialised nfs_fattr structure
+ */
+void nfs_fattr_free_names(struct nfs_fattr *fattr)
+{
+        if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)
+                nfs_fattr_free_owner_name(fattr);
+        if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)
+                nfs_fattr_free_group_name(fattr);
+}
+
+/**
+ * nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free
+ * @server: pointer to the filesystem nfs_server structure
+ * @fattr: a fully initialised nfs_fattr structure
+ *
+ * This helper maps the cached NFSv4 owner/group strings in fattr into
+ * their numeric uid/gid equivalents, and then frees the cached strings.
+ */
+void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr)
+{
+        if (nfs_fattr_map_owner_name(server, fattr))
+                nfs_fattr_free_owner_name(fattr);
+        if (nfs_fattr_map_group_name(server, fattr))
+                nfs_fattr_free_group_name(fattr);
+}
+
+int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res)
+{
+        unsigned long val;
+        char buf[16];
+
+        if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf))
+                return 0;
+        memcpy(buf, name, namelen);
+        buf[namelen] = '\0';
+        if (kstrtoul(buf, 0, &val) != 0)
+                return 0;
+        *res = val;
+        return 1;
+}
+EXPORT_SYMBOL_GPL(nfs_map_string_to_numeric);
+
+static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen)
+{
+        return snprintf(buf, buflen, "%u", id);
+}
+
+static struct key_type key_type_id_resolver = {
+        .name           = "id_resolver",
+        .preparse       = user_preparse,
+        .free_preparse  = user_free_preparse,
+        .instantiate    = generic_key_instantiate,
+        .revoke         = user_revoke,
+        .destroy        = user_destroy,
+        .describe       = user_describe,
+        .read           = user_read,
+};
+
+static int nfs_idmap_init_keyring(void)
+{
+        struct cred *cred;
+        struct key *keyring;
+        int ret = 0;
+
+        printk(KERN_NOTICE "NFS: Registering the %s key type\n",
+                key_type_id_resolver.name);
+
+        cred = prepare_kernel_cred(NULL);
+        if (!cred)
+                return -ENOMEM;
+
+        keyring = keyring_alloc(".id_resolver",
+                                GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
+                                (KEY_POS_ALL & ~KEY_POS_SETATTR) |
+                                KEY_USR_VIEW | KEY_USR_READ,
+                                KEY_ALLOC_NOT_IN_QUOTA, NULL);
+        if (IS_ERR(keyring)) {
+                ret = PTR_ERR(keyring);
+                goto failed_put_cred;
+        }
+
+        ret = register_key_type(&key_type_id_resolver);
+        if (ret < 0)
+                goto failed_put_key;
+
+        ret = register_key_type(&key_type_id_resolver_legacy);
+        if (ret < 0)
+                goto failed_reg_legacy;
+
+        set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags);
+        cred->thread_keyring = keyring;
+        cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;
+        id_resolver_cache = cred;
+        return 0;
+
+failed_reg_legacy:
+        unregister_key_type(&key_type_id_resolver);
+failed_put_key:
+        key_put(keyring);
+failed_put_cred:
+        put_cred(cred);
+        return ret;
+}
+
+static void nfs_idmap_quit_keyring(void)
+{
+        key_revoke(id_resolver_cache->thread_keyring);
+        unregister_key_type(&key_type_id_resolver);
+        unregister_key_type(&key_type_id_resolver_legacy);
+        put_cred(id_resolver_cache);
+}
+
+/*
+ * Assemble the description to pass to request_key()
+ * This function will allocate a new string and update dest to point
+ * at it.  The caller is responsible for freeing dest.
+ *
+ * On error 0 is returned.  Otherwise, the length of dest is returned.
+ */
+static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen,
+                                const char *type, size_t typelen, char **desc)
+{
+        char *cp;
+        size_t desclen = typelen + namelen + 2;
+
+        *desc = kmalloc(desclen, GFP_KERNEL);
+        if (!*desc)
+                return -ENOMEM;
+
+        cp = *desc;
+        memcpy(cp, type, typelen);
+        cp += typelen;
+        *cp++ = ':';
+
+        memcpy(cp, name, namelen);
+        cp += namelen;
+        *cp = '\0';
+        return desclen;
+}
+
+static struct key *nfs_idmap_request_key(const char *name, size_t namelen,
+                                         const char *type, struct idmap *idmap)
+{
+        char *desc;
+        struct key *rkey;
+        ssize_t ret;
+
+        ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc);
+        if (ret <= 0)
+                return ERR_PTR(ret);
+
+        rkey = request_key(&key_type_id_resolver, desc, "");
+        if (IS_ERR(rkey)) {
+                mutex_lock(&idmap->idmap_mutex);
+                rkey = request_key_with_auxdata(&key_type_id_resolver_legacy,
+                                                desc, "", 0, idmap);
+                mutex_unlock(&idmap->idmap_mutex);
+        }
+        if (!IS_ERR(rkey))
+                set_bit(KEY_FLAG_ROOT_CAN_INVAL, &rkey->flags);
+
+        kfree(desc);
+        return rkey;
+}
+
+static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
+                                 const char *type, void *data,
+                                 size_t data_size, struct idmap *idmap)
+{
+        const struct cred *saved_cred;
+        struct key *rkey;
+        struct user_key_payload *payload;
+        ssize_t ret;
+
+        saved_cred = override_creds(id_resolver_cache);
+        rkey = nfs_idmap_request_key(name, namelen, type, idmap);
+        revert_creds(saved_cred);
+
+        if (IS_ERR(rkey)) {
+                ret = PTR_ERR(rkey);
+                goto out;
+        }
+
+        rcu_read_lock();
+        rkey->perm |= KEY_USR_VIEW;
+
+        ret = key_validate(rkey);
+        if (ret < 0)
+                goto out_up;
+
+        payload = rcu_dereference(rkey->payload.rcudata);
+        if (IS_ERR_OR_NULL(payload)) {
+                ret = PTR_ERR(payload);
+                goto out_up;
+        }
+
+        ret = payload->datalen;
+        if (ret > 0 && ret <= data_size)
+                memcpy(data, payload->data, ret);
+        else
+                ret = -EINVAL;
+
+out_up:
+        rcu_read_unlock();
+        key_put(rkey);
+out:
+        return ret;
+}
+
+/* ID -> Name */
+static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf,
+                                     size_t buflen, struct idmap *idmap)
+{
+        char id_str[NFS_UINT_MAXLEN];
+        int id_len;
+        ssize_t ret;
+
+        id_len = snprintf(id_str, sizeof(id_str), "%u", id);
+        ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap);
+        if (ret < 0)
+                return -EINVAL;
+        return ret;
+}
+
+/* Name -> ID */
+static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type,
+                               __u32 *id, struct idmap *idmap)
+{
+        char id_str[NFS_UINT_MAXLEN];
+        long id_long;
+        ssize_t data_size;
+        int ret = 0;
+
+        data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap);
+        if (data_size <= 0) {
+                ret = -EINVAL;
+        } else {
+                ret = kstrtol(id_str, 10, &id_long);
+                *id = (__u32)id_long;
+        }
+        return ret;
+}
+
+/* idmap classic begins here */
+
+enum {
+        Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err
+};
+
+static const match_table_t nfs_idmap_tokens = {
+        { Opt_find_uid, "uid:%s" },
+        { Opt_find_gid, "gid:%s" },
+        { Opt_find_user, "user:%s" },
+        { Opt_find_group, "group:%s" },
+        { Opt_find_err, NULL }
+};
+
+static int nfs_idmap_legacy_upcall(struct key_construction *, const char *, void *);
+static ssize_t idmap_pipe_downcall(struct file *, const char __user *,
+                                   size_t);
+static void idmap_release_pipe(struct inode *);
+static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *);
+
+static const struct rpc_pipe_ops idmap_upcall_ops = {
+        .upcall         = rpc_pipe_generic_upcall,
+        .downcall       = idmap_pipe_downcall,
+        .release_pipe   = idmap_release_pipe,
+        .destroy_msg    = idmap_pipe_destroy_msg,
+};
+
+static struct key_type key_type_id_resolver_legacy = {
+        .name           = "id_legacy",
+        .preparse       = user_preparse,
+        .free_preparse  = user_free_preparse,
+        .instantiate    = generic_key_instantiate,
+        .revoke         = user_revoke,
+        .destroy        = user_destroy,
+        .describe       = user_describe,
+        .read           = user_read,
+        .request_key    = nfs_idmap_legacy_upcall,
+};
+
+static void nfs_idmap_pipe_destroy(struct dentry *dir,
+                struct rpc_pipe_dir_object *pdo)
+{
+        struct idmap *idmap = pdo->pdo_data;
+        struct rpc_pipe *pipe = idmap->idmap_pipe;
+
+        if (pipe->dentry) {
+                rpc_unlink(pipe->dentry);
+                pipe->dentry = NULL;
+        }
+}
+
+static int nfs_idmap_pipe_create(struct dentry *dir,
+                struct rpc_pipe_dir_object *pdo)
+{
+        struct idmap *idmap = pdo->pdo_data;
+        struct rpc_pipe *pipe = idmap->idmap_pipe;
+        struct dentry *dentry;
+
+        dentry = rpc_mkpipe_dentry(dir, "idmap", idmap, pipe);
+        if (IS_ERR(dentry))
+                return PTR_ERR(dentry);
+        pipe->dentry = dentry;
+        return 0;
+}
+
+static const struct rpc_pipe_dir_object_ops nfs_idmap_pipe_dir_object_ops = {
+        .create = nfs_idmap_pipe_create,
+        .destroy = nfs_idmap_pipe_destroy,
+};
+
+int
+nfs_idmap_new(struct nfs_client *clp)
+{
+        struct idmap *idmap;
+        struct rpc_pipe *pipe;
+        int error;
+
+        idmap = kzalloc(sizeof(*idmap), GFP_KERNEL);
+        if (idmap == NULL)
+                return -ENOMEM;
+
+        rpc_init_pipe_dir_object(&idmap->idmap_pdo,
+                        &nfs_idmap_pipe_dir_object_ops,
+                        idmap);
+
+        pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0);
+        if (IS_ERR(pipe)) {
+                error = PTR_ERR(pipe);
+                goto err;
+        }
+        idmap->idmap_pipe = pipe;
+        mutex_init(&idmap->idmap_mutex);
+
+        error = rpc_add_pipe_dir_object(clp->cl_net,
+                        &clp->cl_rpcclient->cl_pipedir_objects,
+                        &idmap->idmap_pdo);
+        if (error)
+                goto err_destroy_pipe;
+
+        clp->cl_idmap = idmap;
+        return 0;
+err_destroy_pipe:
+        rpc_destroy_pipe_data(idmap->idmap_pipe);
+err:
+        kfree(idmap);
+        return error;
+}
+
+void
+nfs_idmap_delete(struct nfs_client *clp)
+{
+        struct idmap *idmap = clp->cl_idmap;
+
+        if (!idmap)
+                return;
+        clp->cl_idmap = NULL;
+        rpc_remove_pipe_dir_object(clp->cl_net,
+                        &clp->cl_rpcclient->cl_pipedir_objects,
+                        &idmap->idmap_pdo);
+        rpc_destroy_pipe_data(idmap->idmap_pipe);
+        kfree(idmap);
+}
+
+int nfs_idmap_init(void)
+{
+        int ret;
+        ret = nfs_idmap_init_keyring();
+        if (ret != 0)
+                goto out;
+out:
+        return ret;
+}
+
+void nfs_idmap_quit(void)
+{
+        nfs_idmap_quit_keyring();
+}
+
+static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap,
+                                     struct idmap_msg *im,
+                                     struct rpc_pipe_msg *msg)
+{
+        substring_t substr;
+        int token, ret;
+
+        im->im_type = IDMAP_TYPE_GROUP;
+        token = match_token(desc, nfs_idmap_tokens, &substr);
+
+        switch (token) {
+        case Opt_find_uid:
+                im->im_type = IDMAP_TYPE_USER;
+        case Opt_find_gid:
+                im->im_conv = IDMAP_CONV_NAMETOID;
+                ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ);
+                break;
+
+        case Opt_find_user:
+                im->im_type = IDMAP_TYPE_USER;
+        case Opt_find_group:
+                im->im_conv = IDMAP_CONV_IDTONAME;
+                ret = match_int(&substr, &im->im_id);
+                break;
+
+        default:
+                ret = -EINVAL;
+                goto out;
+        }
+
+        msg->data = im;
+        msg->len  = sizeof(struct idmap_msg);
+
+out:
+        return ret;
+}
+
+static bool
+nfs_idmap_prepare_pipe_upcall(struct idmap *idmap,
+                struct idmap_legacy_upcalldata *data)
+{
+        if (idmap->idmap_upcall_data != NULL) {
+                WARN_ON_ONCE(1);
+                return false;
+        }
+        idmap->idmap_upcall_data = data;
+        return true;
+}
+
+static void
+nfs_idmap_complete_pipe_upcall_locked(struct idmap *idmap, int ret)
+{
+        struct key_construction *cons = idmap->idmap_upcall_data->key_cons;
+
+        kfree(idmap->idmap_upcall_data);
+        idmap->idmap_upcall_data = NULL;
+        complete_request_key(cons, ret);
+}
+
+static void
+nfs_idmap_abort_pipe_upcall(struct idmap *idmap, int ret)
+{
+        if (idmap->idmap_upcall_data != NULL)
+                nfs_idmap_complete_pipe_upcall_locked(idmap, ret);
+}
+
+static int nfs_idmap_legacy_upcall(struct key_construction *cons,
+                                   const char *op,
+                                   void *aux)
+{
+        struct idmap_legacy_upcalldata *data;
+        struct rpc_pipe_msg *msg;
+        struct idmap_msg *im;
+        struct idmap *idmap = (struct idmap *)aux;
+        struct key *key = cons->key;
+        int ret = -ENOMEM;
+
+        /* msg and im are freed in idmap_pipe_destroy_msg */
+        data = kzalloc(sizeof(*data), GFP_KERNEL);
+        if (!data)
+                goto out1;
+
+        msg = &data->pipe_msg;
+        im = &data->idmap_msg;
+        data->idmap = idmap;
+        data->key_cons = cons;
+
+        ret = nfs_idmap_prepare_message(key->description, idmap, im, msg);
+        if (ret < 0)
+                goto out2;
+
+        ret = -EAGAIN;
+        if (!nfs_idmap_prepare_pipe_upcall(idmap, data))
+                goto out2;
+
+        ret = rpc_queue_upcall(idmap->idmap_pipe, msg);
+        if (ret < 0)
+                nfs_idmap_abort_pipe_upcall(idmap, ret);
+
+        return ret;
+out2:
+        kfree(data);
+out1:
+        complete_request_key(cons, ret);
+        return ret;
+}
+
+static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data, size_t datalen)
+{
+        return key_instantiate_and_link(key, data, datalen,
+                                        id_resolver_cache->thread_keyring,
+                                        authkey);
+}
+
+static int nfs_idmap_read_and_verify_message(struct idmap_msg *im,
+                struct idmap_msg *upcall,
+                struct key *key, struct key *authkey)
+{
+        char id_str[NFS_UINT_MAXLEN];
+        size_t len;
+        int ret = -ENOKEY;
+
+        /* ret = -ENOKEY */
+        if (upcall->im_type != im->im_type || upcall->im_conv != im->im_conv)
+                goto out;
+        switch (im->im_conv) {
+        case IDMAP_CONV_NAMETOID:
+                if (strcmp(upcall->im_name, im->im_name) != 0)
+                        break;
+                /* Note: here we store the NUL terminator too */
+                len = sprintf(id_str, "%d", im->im_id) + 1;
+                ret = nfs_idmap_instantiate(key, authkey, id_str, len);
+                break;
+        case IDMAP_CONV_IDTONAME:
+                if (upcall->im_id != im->im_id)
+                        break;
+                len = strlen(im->im_name);
+                ret = nfs_idmap_instantiate(key, authkey, im->im_name, len);
+                break;
+        default:
+                ret = -EINVAL;
+        }
+out:
+        return ret;
+}
+
+static ssize_t
+idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
+{
+        struct rpc_inode *rpci = RPC_I(file_inode(filp));
+        struct idmap *idmap = (struct idmap *)rpci->private;
+        struct key_construction *cons;
+        struct idmap_msg im;
+        size_t namelen_in;
+        int ret = -ENOKEY;
+
+        /* If instantiation is successful, anyone waiting for key construction
+         * will have been woken up and someone else may now have used
+         * idmap_key_cons - so after this point we may no longer touch it.
+         */
+        if (idmap->idmap_upcall_data == NULL)
+                goto out_noupcall;
+
+        cons = idmap->idmap_upcall_data->key_cons;
+
+        if (mlen != sizeof(im)) {
+                ret = -ENOSPC;
+                goto out;
+        }
+
+        if (copy_from_user(&im, src, mlen) != 0) {
+                ret = -EFAULT;
+                goto out;
+        }
+
+        if (!(im.im_status & IDMAP_STATUS_SUCCESS)) {
+                ret = -ENOKEY;
+                goto out;
+        }
+
+        namelen_in = strnlen(im.im_name, IDMAP_NAMESZ);
+        if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) {
+                ret = -EINVAL;
+                goto out;
+}
+
+        ret = nfs_idmap_read_and_verify_message(&im,
+                        &idmap->idmap_upcall_data->idmap_msg,
+                        cons->key, cons->authkey);
+        if (ret >= 0) {
+                key_set_timeout(cons->key, nfs_idmap_cache_timeout);
+                ret = mlen;
+        }
+
+out:
+        nfs_idmap_complete_pipe_upcall_locked(idmap, ret);
+out_noupcall:
+        return ret;
+}
+
+static void
+idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg)
+{
+        struct idmap_legacy_upcalldata *data = container_of(msg,
+                        struct idmap_legacy_upcalldata,
+                        pipe_msg);
+        struct idmap *idmap = data->idmap;
+
+        if (msg->errno)
+                nfs_idmap_abort_pipe_upcall(idmap, msg->errno);
+}
+
+static void
+idmap_release_pipe(struct inode *inode)
+{
+        struct rpc_inode *rpci = RPC_I(inode);
+        struct idmap *idmap = (struct idmap *)rpci->private;
+
+        nfs_idmap_abort_pipe_upcall(idmap, -EPIPE);
+}
+
+int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, kuid_t *uid)
+{
+        struct idmap *idmap = server->nfs_client->cl_idmap;
+        __u32 id = -1;
+        int ret = 0;
+
+        if (!nfs_map_string_to_numeric(name, namelen, &id))
+                ret = nfs_idmap_lookup_id(name, namelen, "uid", &id, idmap);
+        if (ret == 0) {
+                *uid = make_kuid(&init_user_ns, id);
+                if (!uid_valid(*uid))
+                        ret = -ERANGE;
+        }
+        trace_nfs4_map_name_to_uid(name, namelen, id, ret);
+        return ret;
+}
+
+int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, kgid_t *gid)
+{
+        struct idmap *idmap = server->nfs_client->cl_idmap;
+        __u32 id = -1;
+        int ret = 0;
+
+        if (!nfs_map_string_to_numeric(name, namelen, &id))
+                ret = nfs_idmap_lookup_id(name, namelen, "gid", &id, idmap);
+        if (ret == 0) {
+                *gid = make_kgid(&init_user_ns, id);
+                if (!gid_valid(*gid))
+                        ret = -ERANGE;
+        }
+        trace_nfs4_map_group_to_gid(name, namelen, id, ret);
+        return ret;
+}
+
+int nfs_map_uid_to_name(const struct nfs_server *server, kuid_t uid, char *buf, size_t buflen)
+{
+        struct idmap *idmap = server->nfs_client->cl_idmap;
+        int ret = -EINVAL;
+        __u32 id;
+
+        id = from_kuid(&init_user_ns, uid);
+        if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
+                ret = nfs_idmap_lookup_name(id, "user", buf, buflen, idmap);
+        if (ret < 0)
+                ret = nfs_map_numeric_to_string(id, buf, buflen);
+        trace_nfs4_map_uid_to_name(buf, ret, id, ret);
+        return ret;
+}
+int nfs_map_gid_to_group(const struct nfs_server *server, kgid_t gid, char *buf, size_t buflen)
+{
+        struct idmap *idmap = server->nfs_client->cl_idmap;
+        int ret = -EINVAL;
+        __u32 id;
+
+        id = from_kgid(&init_user_ns, gid);
+        if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
+                ret = nfs_idmap_lookup_name(id, "group", buf, buflen, idmap);
+        if (ret < 0)
+                ret = nfs_map_numeric_to_string(id, buf, buflen);
+        trace_nfs4_map_gid_to_group(buf, ret, id, ret);
+        return ret;
+}