/*      $NetBSD: vfs_xattr.c,v 1.41 2024/12/07 02:27:38 riastradh Exp $ */

/*-
 * Copyright (c) 2005, 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION 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.
 */

/*
 * Copyright (c) 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * 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 BY THE REGENTS AND CONTRIBUTORS ``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.
 */

/*
 * VFS extended attribute support.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_xattr.c,v 1.41 2024/12/07 02:27:38 riastradh Exp $");

#include <sys/param.h>
#include <sys/types.h>

#include <sys/extattr.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/kauth.h>
#include <sys/kernel.h>
#include <sys/ktrace.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/sdt.h>
#include <sys/syscallargs.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#include <sys/xattr.h>

#include <miscfs/genfs/genfs.h>

static void
ktr_xattr_name(const char *str)
{
        ktrkuser("xattr-name", (void *)__UNCONST(str), strlen(str));
}

static void
ktr_xattr_val(const void *data, size_t cnt)
{
        ktruser("xattr-val", __UNCONST(data), cnt, 0);
}

/*
 * Credential check based on process requesting service, and per-attribute
 * permissions.
 *
 * NOTE: Vnode must be locked.
 */
int
extattr_check_cred(struct vnode *vp, int attrspace, kauth_cred_t cred,
    int access)
{

        if (cred == NOCRED)
                return 0;

        return kauth_authorize_vnode(cred, kauth_extattr_action(access), vp,
            NULL, genfs_can_extattr(vp, cred, access, attrspace));
}

/*
 * Default vfs_extattrctl routine for file systems that do not support
 * it.
 */
/*ARGSUSED*/
int
vfs_stdextattrctl(struct mount *mp, int cmt, struct vnode *vp,
    int attrnamespace, const char *attrname)
{

        if (vp != NULL)
                VOP_UNLOCK(vp);
        return SET_ERROR(EOPNOTSUPP);
}

/*
 * Push extended attribute configuration information into the file
 * system.
 *
 * NOTE: Not all file systems that support extended attributes will
 * require the use of this system call.
 */
int
sys_extattrctl(struct lwp *l, const struct sys_extattrctl_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(int) cmd;
                syscallarg(const char *) filename;
                syscallarg(int) attrnamespace;
                syscallarg(const char *) attrname;
        } */
        struct vnode *path_vp, *file_vp;
        struct pathbuf *file_pb;
        struct nameidata file_nd;
        char attrname[EXTATTR_MAXNAMELEN];
        int error;

        if (SCARG(uap, attrname) != NULL) {
                error = copyinstr(SCARG(uap, attrname), attrname,
                    sizeof(attrname), NULL);
                if (error)
                        return error;
        }

        error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT,
            &path_vp);
        if (error)
                return error;

        file_vp = NULL;
        if (SCARG(uap, filename) != NULL) {
                error = pathbuf_copyin(SCARG(uap, filename), &file_pb);
                if (error) {
                        vrele(path_vp);
                        return error;
                }
                NDINIT(&file_nd, LOOKUP, FOLLOW | LOCKLEAF, file_pb);
                error = namei(&file_nd);
                if (error) {
                        pathbuf_destroy(file_pb);
                        vrele(path_vp);
                        return error;
                }
                file_vp = file_nd.ni_vp;
                pathbuf_destroy(file_pb);
        }

        error = VFS_EXTATTRCTL(path_vp->v_mount, SCARG(uap, cmd), file_vp,
            SCARG(uap, attrnamespace),
            SCARG(uap, attrname) != NULL ? attrname : NULL);

        if (file_vp != NULL)
                vrele(file_vp);
        vrele(path_vp);

        return error;
}

/*****************************************************************************
 * Internal routines to manipulate file system extended attributes:
 *      - set
 *      - get
 *      - delete
 *      - list
 *****************************************************************************/

/*
 * extattr_set_vp:
 *
 *      Set a named extended attribute on a file or directory.
 */
static int
extattr_set_vp(struct vnode *vp, int attrnamespace, const char *attrname,
    const void *data, size_t nbytes, struct lwp *l, register_t *retval,
    int flag)
{
        struct uio auio;
        struct iovec aiov;
        ssize_t cnt;
        int error;

        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);

        if (flag) {
                size_t attrlen;

                error = VOP_GETEXTATTR(vp, attrnamespace, attrname, NULL,
                    &attrlen, l->l_cred);

                switch (error) {
                case ENODATA:
                case ENOATTR:
                        if (flag & XATTR_REPLACE)
                                goto done;
                        break;
                case 0:
                        if (flag & XATTR_CREATE) {
                                error = SET_ERROR(EEXIST);
                                goto done;
                        }
                        break;
                default:
                        goto done;
                        break;
                }
        }

        aiov.iov_base = __UNCONST(data);        /* XXXUNCONST kills const */
        aiov.iov_len = nbytes;
        auio.uio_iov = &aiov;
        auio.uio_iovcnt = 1;
        auio.uio_offset = 0;
        if (nbytes > INT_MAX) {
                error = SET_ERROR(EINVAL);
                goto done;
        }
        auio.uio_resid = nbytes;
        auio.uio_rw = UIO_WRITE;
        KASSERT(l == curlwp);
        auio.uio_vmspace = l->l_proc->p_vmspace;
        cnt = nbytes;

        ktr_xattr_name(attrname);
        ktr_xattr_val(data, nbytes);

        error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, l->l_cred);
        cnt -= auio.uio_resid;
        retval[0] = cnt;

done:
        VOP_UNLOCK(vp);
        return error;
}

/*
 * extattr_get_vp:
 *
 *      Get a named extended attribute on a file or directory.
 */
static int
extattr_get_vp(struct vnode *vp, int attrnamespace, const char *attrname,
    void *data, size_t nbytes, struct lwp *l, register_t *retval)
{
        struct uio auio, *auiop;
        struct iovec aiov;
        ssize_t cnt;
        size_t size, *sizep;
        int error;

        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);

        /*
         * Slightly unusual semantics: if the user provides a NULL data
         * pointer, they don't want to receive the data, just the maximum
         * read length.
         */
        auiop = NULL;
        sizep = NULL;
        cnt = 0;
        if (data != NULL) {
                aiov.iov_base = data;
                aiov.iov_len = nbytes;
                auio.uio_iov = &aiov;
                auio.uio_iovcnt = 1;
                auio.uio_offset = 0;
                if (nbytes > INT_MAX) {
                        error = SET_ERROR(EINVAL);
                        goto done;
                }
                auio.uio_resid = nbytes;
                auio.uio_rw = UIO_READ;
                KASSERT(l == curlwp);
                auio.uio_vmspace = l->l_proc->p_vmspace;
                auiop = &auio;
                cnt = nbytes;
        } else
                sizep = &size;

        ktr_xattr_name(attrname);

        error = VOP_GETEXTATTR(vp, attrnamespace, attrname, auiop, sizep,
            l->l_cred);

        if (auiop != NULL) {
                cnt -= auio.uio_resid;
                retval[0] = cnt;

                ktr_xattr_val(data, cnt);
        } else
                retval[0] = size;

done:
        VOP_UNLOCK(vp);
        return error;
}

/*
 * extattr_delete_vp:
 *
 *      Delete a named extended attribute on a file or directory.
 */
static int
extattr_delete_vp(struct vnode *vp, int attrnamespace, const char *attrname,
    struct lwp *l)
{
        int error;

        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);

        ktr_xattr_name(attrname);

        error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, l->l_cred);
        if (error == EOPNOTSUPP)
                error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL,
                    l->l_cred);

        VOP_UNLOCK(vp);
        return error;
}

/*
 * extattr_list_vp:
 *
 *      Retrieve a list of extended attributes on a file or directory.
 */
static int
extattr_list_vp(struct vnode *vp, int attrnamespace, void *data, size_t nbytes,
    int flag, struct lwp *l, register_t *retval)
{
        struct uio auio, *auiop;
        size_t size, *sizep;
        struct iovec aiov;
        ssize_t cnt;
        int error;

        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);

        auiop = NULL;
        sizep = NULL;
        cnt = 0;
        if (data != NULL) {
                aiov.iov_base = data;
                aiov.iov_len = nbytes;
                auio.uio_iov = &aiov;
                auio.uio_iovcnt = 1;
                auio.uio_offset = 0;
                if (nbytes > INT_MAX) {
                        error = SET_ERROR(EINVAL);
                        goto done;
                }
                auio.uio_resid = nbytes;
                auio.uio_rw = UIO_READ;
                KASSERT(l == curlwp);
                auio.uio_vmspace = l->l_proc->p_vmspace;
                auiop = &auio;
                cnt = nbytes;
        } else
                sizep = &size;

        error = VOP_LISTEXTATTR(vp, attrnamespace, auiop, sizep, flag,
            l->l_cred);

        if (auiop != NULL) {
                cnt -= auio.uio_resid;
                retval[0] = cnt;

                ktruser("xattr-list", data, cnt, 0);
        } else
                retval[0] = size;

done:
        VOP_UNLOCK(vp);
        return error;
}

/*****************************************************************************
 * BSD <sys/extattr.h> API for file system extended attributes
 *****************************************************************************/

int
sys_extattr_set_fd(struct lwp *l, const struct sys_extattr_set_fd_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(int) attrnamespace;
                syscallarg(const char *) attrname;
                syscallarg(const void *) data;
                syscallarg(size_t) nbytes;
        } */
        struct file *fp;
        struct vnode *vp;
        char attrname[EXTATTR_MAXNAMELEN];
        int error;

        error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = fd_getvnode(SCARG(uap, fd), &fp);
        if (error)
                return error;
        vp = fp->f_vnode;

        error = extattr_set_vp(vp, SCARG(uap, attrnamespace), attrname,
            SCARG(uap, data), SCARG(uap, nbytes), l, retval, 0);

        fd_putfile(SCARG(uap, fd));
        return error;
}

int
sys_extattr_set_file(struct lwp *l,
    const struct sys_extattr_set_file_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(int) attrnamespace;
                syscallarg(const char *) attrname;
                syscallarg(const void *) data;
                syscallarg(size_t) nbytes;
        } */
        struct vnode *vp;
        char attrname[EXTATTR_MAXNAMELEN];
        int error;

        error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT,
            &vp);
        if (error)
                return error;

        error = extattr_set_vp(vp, SCARG(uap, attrnamespace), attrname,
            SCARG(uap, data), SCARG(uap, nbytes), l, retval, 0);

        vrele(vp);
        return error;
}

int
sys_extattr_set_link(struct lwp *l,
    const struct sys_extattr_set_link_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(int) attrnamespace;
                syscallarg(const char *) attrname;
                syscallarg(const void *) data;
                syscallarg(size_t) nbytes;
        } */
        struct vnode *vp;
        char attrname[EXTATTR_MAXNAMELEN];
        int error;

        error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT,
            &vp);
        if (error)
                return error;

        error = extattr_set_vp(vp, SCARG(uap, attrnamespace), attrname,
            SCARG(uap, data), SCARG(uap, nbytes), l, retval, 0);

        vrele(vp);
        return error;
}

int
sys_extattr_get_fd(struct lwp *l,
    const struct sys_extattr_get_fd_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(int) attrnamespace;
                syscallarg(const char *) attrname;
                syscallarg(void *) data;
                syscallarg(size_t) nbytes;
        } */
        struct file *fp;
        struct vnode *vp;
        char attrname[EXTATTR_MAXNAMELEN];
        int error;

        error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = fd_getvnode(SCARG(uap, fd), &fp);
        if (error)
                return error;
        vp = fp->f_vnode;

        error = extattr_get_vp(vp, SCARG(uap, attrnamespace), attrname,
            SCARG(uap, data), SCARG(uap, nbytes), l, retval);

        fd_putfile(SCARG(uap, fd));
        return error;
}

int
sys_extattr_get_file(struct lwp *l,
    const struct sys_extattr_get_file_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(int) attrnamespace;
                syscallarg(const char *) attrname;
                syscallarg(void *) data;
                syscallarg(size_t) nbytes;
        } */
        struct vnode *vp;
        char attrname[EXTATTR_MAXNAMELEN];
        int error;

        error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT,
            &vp);
        if (error)
                return error;

        error = extattr_get_vp(vp, SCARG(uap, attrnamespace), attrname,
            SCARG(uap, data), SCARG(uap, nbytes), l, retval);

        vrele(vp);
        return error;
}

int
sys_extattr_get_link(struct lwp *l,
    const struct sys_extattr_get_link_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(int) attrnamespace;
                syscallarg(const char *) attrname;
                syscallarg(void *) data;
                syscallarg(size_t) nbytes;
        } */
        struct vnode *vp;
        char attrname[EXTATTR_MAXNAMELEN];
        int error;

        error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT,
            &vp);
        if (error)
                return error;

        error = extattr_get_vp(vp, SCARG(uap, attrnamespace), attrname,
            SCARG(uap, data), SCARG(uap, nbytes), l, retval);

        vrele(vp);
        return error;
}

int
sys_extattr_delete_fd(struct lwp *l,
    const struct sys_extattr_delete_fd_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(int) attrnamespace;
                syscallarg(const char *) attrname;
        } */
        struct file *fp;
        struct vnode *vp;
        char attrname[EXTATTR_MAXNAMELEN];
        int error;

        error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = fd_getvnode(SCARG(uap, fd), &fp);
        if (error)
                return error;
        vp = fp->f_vnode;

        error = extattr_delete_vp(vp, SCARG(uap, attrnamespace), attrname, l);

        fd_putfile(SCARG(uap, fd));
        return error;
}

int
sys_extattr_delete_file(struct lwp *l,
    const struct sys_extattr_delete_file_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(int) attrnamespace;
                syscallarg(const char *) attrname;
        } */
        struct vnode *vp;
        char attrname[EXTATTR_MAXNAMELEN];
        int error;

        error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT,
            &vp);
        if (error)
                return error;

        error = extattr_delete_vp(vp, SCARG(uap, attrnamespace), attrname, l);

        vrele(vp);
        return error;
}

int
sys_extattr_delete_link(struct lwp *l,
    const struct sys_extattr_delete_link_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(int) attrnamespace;
                syscallarg(const char *) attrname;
        } */
        struct vnode *vp;
        char attrname[EXTATTR_MAXNAMELEN];
        int error;

        error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT,
            &vp);
        if (error)
                return error;

        error = extattr_delete_vp(vp, SCARG(uap, attrnamespace), attrname, l);

        vrele(vp);
        return error;
}

int
sys_extattr_list_fd(struct lwp *l,
    const struct sys_extattr_list_fd_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(int) attrnamespace;
                syscallarg(void *) data;
                syscallarg(size_t) nbytes;
        } */
        struct file *fp;
        struct vnode *vp;
        int error;

        error = fd_getvnode(SCARG(uap, fd), &fp);
        if (error)
                return error;
        vp = fp->f_vnode;

        error = extattr_list_vp(vp, SCARG(uap, attrnamespace),
            SCARG(uap, data), SCARG(uap, nbytes),
            EXTATTR_LIST_LENPREFIX, l, retval);

        fd_putfile(SCARG(uap, fd));
        return error;
}

int
sys_extattr_list_file(struct lwp *l,
    const struct sys_extattr_list_file_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(int) attrnamespace;
                syscallarg(void *) data;
                syscallarg(size_t) nbytes;
        } */
        struct vnode *vp;
        int error;

        error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT,
            &vp);
        if (error)
                return error;

        error = extattr_list_vp(vp, SCARG(uap, attrnamespace),
            SCARG(uap, data), SCARG(uap, nbytes),
            EXTATTR_LIST_LENPREFIX, l, retval);

        vrele(vp);
        return error;
}

int
sys_extattr_list_link(struct lwp *l,
    const struct sys_extattr_list_link_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(int) attrnamespace;
                syscallarg(void *) data;
                syscallarg(size_t) nbytes;
        } */
        struct vnode *vp;
        int error;

        error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT,
            &vp);
        if (error)
                return error;

        error = extattr_list_vp(vp, SCARG(uap, attrnamespace),
            SCARG(uap, data), SCARG(uap, nbytes),
            EXTATTR_LIST_LENPREFIX, l, retval);

        vrele(vp);
        return error;
}

/*****************************************************************************
 * Linux-compatible <sys/xattr.h> API for file system extended attributes
 *****************************************************************************/

#define MATCH_NS(ns, key) (strncmp(ns, key, sizeof(ns) - 1) == 0)
static int
xattr_native(const char *key)
{

        if (MATCH_NS("system.", key))
                return EXTATTR_NAMESPACE_SYSTEM;
        else if (MATCH_NS("user.", key))
                return EXTATTR_NAMESPACE_USER;
        else if (MATCH_NS("security.", key))
                return EXTATTR_NAMESPACE_SYSTEM;
        else if (MATCH_NS("trusted.", key))
                return EXTATTR_NAMESPACE_SYSTEM;
        else
                return EXTATTR_NAMESPACE_USER;
}
#undef MATCH_NS

#define XATTR_ERRNO(e) ((e) == EOPNOTSUPP ? SET_ERROR(ENOTSUP) : (e))

int
sys_setxattr(struct lwp *l,
    const struct sys_setxattr_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(const char *) name;
                syscallarg(void *) value;
                syscallarg(size_t) size;
                syscallarg(int) flags;
        } */
        struct vnode *vp;
        char attrname[XATTR_NAME_MAX];
        int attrnamespace;
        register_t attrlen;
        int error;

        error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname),
            NULL);
        if (error)
                goto out;

        error = namei_simple_user(SCARG(uap, path),
            NSM_FOLLOW_NOEMULROOT, &vp);
        if (error)
                goto out;

        attrnamespace = xattr_native(attrname);

        error = extattr_set_vp(vp, attrnamespace,
            attrname, SCARG(uap, value), SCARG(uap, size), l,
            &attrlen, SCARG(uap, flags));

        vrele(vp);
out:
        *retval = (error == 0 ? 0 : -1);
        return XATTR_ERRNO(error);
}

int
sys_lsetxattr(struct lwp *l,
    const struct sys_lsetxattr_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(const char *) name;
                syscallarg(void *) value;
                syscallarg(size_t) size;
                syscallarg(int) flags;
        } */
        struct vnode *vp;
        char attrname[XATTR_NAME_MAX];
        int attrnamespace;
        register_t attrlen;
        int error;

        error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname),
            NULL);
        if (error)
                goto out;

        error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT,
            &vp);
        if (error)
                goto out;

        attrnamespace = xattr_native(attrname);

        error = extattr_set_vp(vp, attrnamespace,
            attrname, SCARG(uap, value), SCARG(uap, size), l,
            &attrlen, SCARG(uap, flags));

        vrele(vp);
out:
        *retval = (error == 0 ? 0 : -1);
        return XATTR_ERRNO(error);
}

int
sys_fsetxattr(struct lwp *l,
    const struct sys_fsetxattr_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(const char *) name;
                syscallarg(void *) value;
                syscallarg(size_t) size;
                syscallarg(int) flags;
        } */
        struct file *fp;
        struct vnode *vp;
        char attrname[XATTR_NAME_MAX];
        int attrnamespace;
        register_t attrlen;
        int error;

        error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname),
            NULL);
        if (error)
                goto out;

        error = fd_getvnode(SCARG(uap, fd), &fp);
        if (error)
                goto out;
        vp = fp->f_vnode;

        attrnamespace = xattr_native(attrname);

        error = extattr_set_vp(vp, attrnamespace,
            attrname, SCARG(uap, value), SCARG(uap, size), l,
            &attrlen, SCARG(uap, flags));

        fd_putfile(SCARG(uap, fd));
out:
        *retval = (error == 0 ? 0 : -1);
        return XATTR_ERRNO(error);
}

int
sys_getxattr(struct lwp *l,
    const struct sys_getxattr_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(const char *) name;
                syscallarg(void *) value;
                syscallarg(size_t) size;
        } */
        struct vnode *vp;
        char attrname[XATTR_NAME_MAX];
        int attrnamespace;
        int error;

        error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT,
            &vp);
        if (error)
                return error;

        attrnamespace = xattr_native(attrname);

        error = extattr_get_vp(vp, attrnamespace,
            attrname, SCARG(uap, value), SCARG(uap, size), l, retval);

        vrele(vp);
        return XATTR_ERRNO(error);
}

int
sys_lgetxattr(struct lwp *l,
    const struct sys_lgetxattr_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(const char *) name;
                syscallarg(void *) value;
                syscallarg(size_t) size;
        } */
        struct vnode *vp;
        char attrname[XATTR_NAME_MAX];
        int attrnamespace;
        int error;

        error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT,
            &vp);
        if (error)
                return error;

        attrnamespace = xattr_native(attrname);

        error = extattr_get_vp(vp, attrnamespace,
            attrname, SCARG(uap, value), SCARG(uap, size), l, retval);

        vrele(vp);
        return XATTR_ERRNO(error);
}

int
sys_fgetxattr(struct lwp *l,
    const struct sys_fgetxattr_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(const char *) name;
                syscallarg(void *) value;
                syscallarg(size_t) size;
        } */
        struct file *fp;
        struct vnode *vp;
        char attrname[XATTR_NAME_MAX];
        int attrnamespace;
        int error;

        error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = fd_getvnode(SCARG(uap, fd), &fp);
        if (error)
                return error;
        vp = fp->f_vnode;

        attrnamespace = xattr_native(attrname);

        error = extattr_get_vp(vp, attrnamespace,
            attrname, SCARG(uap, value), SCARG(uap, size), l, retval);

        fd_putfile(SCARG(uap, fd));
        return XATTR_ERRNO(error);
}

int
sys_listxattr(struct lwp *l,
    const struct sys_listxattr_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(char *) list;
                syscallarg(size_t) size;
        } */
        struct vnode *vp;
        char *list;
        size_t size;
        register_t listsize_usr, listsize_sys;
        int error;

        error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT,
            &vp);
        if (error)
                return error;

        list = SCARG(uap, list);
        size = SCARG(uap, size);

        error = extattr_list_vp(vp, EXTATTR_NAMESPACE_USER,
            list, size, 0, l, &listsize_usr);
        if (error)
                goto out;

        if (list)
                list += listsize_usr;
        if (size)
                size -= listsize_usr;

        error = extattr_list_vp(vp, EXTATTR_NAMESPACE_SYSTEM,
            list, size, 0, l, &listsize_sys);
        switch (error) {
        case EPERM:
                error = 0; /* Ignore and just skip system EA */
                listsize_sys = 0;
                break;
        case 0:
                break;
        default:
                goto out;
                break;
        }

        *retval = listsize_usr + listsize_sys;
out:
        vrele(vp);
        return XATTR_ERRNO(error);
}

int
sys_llistxattr(struct lwp *l,
    const struct sys_llistxattr_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(char *) list;
                syscallarg(size_t) size;
        } */
        struct vnode *vp;
        char *list;
        size_t size;
        register_t listsize_usr, listsize_sys;
        int error;

        error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT,
            &vp);
        if (error)
                return error;

        list = SCARG(uap, list);
        size = SCARG(uap, size);

        error = extattr_list_vp(vp, EXTATTR_NAMESPACE_USER,
            list, size, 0, l, &listsize_usr);
        if (error)
                goto out;
        if (list)
                list += listsize_usr;
        if (size)
                size -= listsize_usr;

        error = extattr_list_vp(vp, EXTATTR_NAMESPACE_SYSTEM,
            list, size, 0, l, &listsize_sys);
        switch (error) {
        case EPERM:
                error = 0; /* Ignore and just skip system EA */
                listsize_sys = 0;
                break;
        case 0:
                break;
        default:
                goto out;
                break;
        }

        *retval = listsize_usr + listsize_sys;
out:
        vrele(vp);
        return XATTR_ERRNO(error);
}

int
sys_flistxattr(struct lwp *l,
    const struct sys_flistxattr_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(char *) list;
                syscallarg(size_t) size;
        } */
        struct file *fp;
        struct vnode *vp;
        char *list;
        size_t size;
        register_t listsize_usr, listsize_sys;
        int error;

        error = fd_getvnode(SCARG(uap, fd), &fp);
        if (error)
                return error;
        vp = fp->f_vnode;

        list = SCARG(uap, list);
        size = SCARG(uap, size);

        error = extattr_list_vp(vp, EXTATTR_NAMESPACE_USER,
            list, size, 0, l, &listsize_usr);
        if (error)
                goto out;

        if (list)
                list += listsize_usr;
        if (size)
                size -= listsize_usr;

        error = extattr_list_vp(vp, EXTATTR_NAMESPACE_SYSTEM,
            list, size, 0, l, &listsize_sys);
        switch (error) {
        case EPERM:
                error = 0; /* Ignore and just skip system EA */
                listsize_sys = 0;
                break;
        case 0:
                break;
        default:
                goto out;
                break;
        }

        *retval = listsize_usr + listsize_sys;
out:
        fd_putfile(SCARG(uap, fd));
        return XATTR_ERRNO(error);
}

int
sys_removexattr(struct lwp *l,
    const struct sys_removexattr_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(const char *) name;
        } */
        struct vnode *vp;
        char attrname[XATTR_NAME_MAX];
        int attrnamespace;
        int error;

        error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = namei_simple_user(SCARG(uap, path), NSM_FOLLOW_NOEMULROOT,
            &vp);
        if (error)
                return error;

        attrnamespace = xattr_native(attrname);

        error = extattr_delete_vp(vp, attrnamespace, attrname, l);

        vrele(vp);
        return XATTR_ERRNO(error);
}

int
sys_lremovexattr(struct lwp *l,
    const struct sys_lremovexattr_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(const char *) name;
        } */
        struct vnode *vp;
        char attrname[XATTR_NAME_MAX];
        int attrnamespace;
        int error;

        error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = namei_simple_user(SCARG(uap, path), NSM_NOFOLLOW_NOEMULROOT,
            &vp);
        if (error)
                return error;

        attrnamespace = xattr_native(attrname);

        error = extattr_delete_vp(vp, attrnamespace, attrname, l);

        vrele(vp);
        return XATTR_ERRNO(error);
}

int
sys_fremovexattr(struct lwp *l,
    const struct sys_fremovexattr_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(const char *) name;
        } */
        struct file *fp;
        struct vnode *vp;
        char attrname[XATTR_NAME_MAX];
        int attrnamespace;
        int error;

        error = copyinstr(SCARG(uap, name), attrname, sizeof(attrname),
            NULL);
        if (error)
                return error;

        error = fd_getvnode(SCARG(uap, fd), &fp);
        if (error)
                return error;
        vp = fp->f_vnode;

        attrnamespace = xattr_native(attrname);

        error = extattr_delete_vp(vp, attrnamespace, attrname, l);

        fd_putfile(SCARG(uap, fd));
        return XATTR_ERRNO(error);
}