// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2004-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#include <linux/mount.h>
#include <linux/fsmap.h>
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_iwalk.h"
#include "xfs_itable.h"
#include "xfs_fsops.h"
#include "xfs_rtalloc.h"
#include "xfs_attr.h"
#include "xfs_ioctl.h"
#include "xfs_ioctl32.h"
#include "xfs_trace.h"
#include "xfs_sb.h"

#define  _NATIVE_IOC(cmd, type) \
          _IOC(_IOC_DIR(cmd), _IOC_TYPE(cmd), _IOC_NR(cmd), sizeof(type))

#ifdef BROKEN_X86_ALIGNMENT
STATIC int
xfs_compat_flock64_copyin(
        xfs_flock64_t           *bf,
        compat_xfs_flock64_t    __user *arg32)
{
        if (get_user(bf->l_type,        &arg32->l_type) ||
            get_user(bf->l_whence,      &arg32->l_whence) ||
            get_user(bf->l_start,       &arg32->l_start) ||
            get_user(bf->l_len,         &arg32->l_len) ||
            get_user(bf->l_sysid,       &arg32->l_sysid) ||
            get_user(bf->l_pid,         &arg32->l_pid) ||
            copy_from_user(bf->l_pad,   &arg32->l_pad,  4*sizeof(u32)))
                return -EFAULT;
        return 0;
}

STATIC int
xfs_compat_ioc_fsgeometry_v1(
        struct xfs_mount          *mp,
        compat_xfs_fsop_geom_v1_t __user *arg32)
{
        struct xfs_fsop_geom      fsgeo;

        xfs_fs_geometry(mp, &fsgeo, 3);
        /* The 32-bit variant simply has some padding at the end */
        if (copy_to_user(arg32, &fsgeo, sizeof(struct compat_xfs_fsop_geom_v1)))
                return -EFAULT;
        return 0;
}

STATIC int
xfs_compat_growfs_data_copyin(
        struct xfs_growfs_data   *in,
        compat_xfs_growfs_data_t __user *arg32)
{
        if (get_user(in->newblocks, &arg32->newblocks) ||
            get_user(in->imaxpct,   &arg32->imaxpct))
                return -EFAULT;
        return 0;
}

STATIC int
xfs_compat_growfs_rt_copyin(
        struct xfs_growfs_rt     *in,
        compat_xfs_growfs_rt_t  __user *arg32)
{
        if (get_user(in->newblocks, &arg32->newblocks) ||
            get_user(in->extsize,   &arg32->extsize))
                return -EFAULT;
        return 0;
}

STATIC int
xfs_fsinumbers_fmt_compat(
        struct xfs_ibulk                *breq,
        const struct xfs_inumbers       *ig)
{
        struct compat_xfs_inogrp __user *p32 = breq->ubuffer;
        struct xfs_inogrp               ig1;
        struct xfs_inogrp               *igrp = &ig1;

        xfs_inumbers_to_inogrp(&ig1, ig);

        if (put_user(igrp->xi_startino,   &p32->xi_startino) ||
            put_user(igrp->xi_alloccount, &p32->xi_alloccount) ||
            put_user(igrp->xi_allocmask,  &p32->xi_allocmask))
                return -EFAULT;

        return xfs_ibulk_advance(breq, sizeof(struct compat_xfs_inogrp));
}

#else
#define xfs_fsinumbers_fmt_compat xfs_fsinumbers_fmt
#endif  /* BROKEN_X86_ALIGNMENT */

STATIC int
xfs_ioctl32_bstime_copyin(
        xfs_bstime_t            *bstime,
        compat_xfs_bstime_t     __user *bstime32)
{
        old_time32_t            sec32;  /* tv_sec differs on 64 vs. 32 */

        if (get_user(sec32,             &bstime32->tv_sec)      ||
            get_user(bstime->tv_nsec,   &bstime32->tv_nsec))
                return -EFAULT;
        bstime->tv_sec = sec32;
        return 0;
}

/*
 * struct xfs_bstat has differing alignment on intel, & bstime_t sizes
 * everywhere
 */
STATIC int
xfs_ioctl32_bstat_copyin(
        struct xfs_bstat                *bstat,
        struct compat_xfs_bstat __user  *bstat32)
{
        if (get_user(bstat->bs_ino,     &bstat32->bs_ino)       ||
            get_user(bstat->bs_mode,    &bstat32->bs_mode)      ||
            get_user(bstat->bs_nlink,   &bstat32->bs_nlink)     ||
            get_user(bstat->bs_uid,     &bstat32->bs_uid)       ||
            get_user(bstat->bs_gid,     &bstat32->bs_gid)       ||
            get_user(bstat->bs_rdev,    &bstat32->bs_rdev)      ||
            get_user(bstat->bs_blksize, &bstat32->bs_blksize)   ||
            get_user(bstat->bs_size,    &bstat32->bs_size)      ||
            xfs_ioctl32_bstime_copyin(&bstat->bs_atime, &bstat32->bs_atime) ||
            xfs_ioctl32_bstime_copyin(&bstat->bs_mtime, &bstat32->bs_mtime) ||
            xfs_ioctl32_bstime_copyin(&bstat->bs_ctime, &bstat32->bs_ctime) ||
            get_user(bstat->bs_blocks,  &bstat32->bs_size)      ||
            get_user(bstat->bs_xflags,  &bstat32->bs_size)      ||
            get_user(bstat->bs_extsize, &bstat32->bs_extsize)   ||
            get_user(bstat->bs_extents, &bstat32->bs_extents)   ||
            get_user(bstat->bs_gen,     &bstat32->bs_gen)       ||
            get_user(bstat->bs_projid_lo, &bstat32->bs_projid_lo) ||
            get_user(bstat->bs_projid_hi, &bstat32->bs_projid_hi) ||
            get_user(bstat->bs_forkoff, &bstat32->bs_forkoff)   ||
            get_user(bstat->bs_dmevmask, &bstat32->bs_dmevmask) ||
            get_user(bstat->bs_dmstate, &bstat32->bs_dmstate)   ||
            get_user(bstat->bs_aextents, &bstat32->bs_aextents))
                return -EFAULT;
        return 0;
}

/* XFS_IOC_FSBULKSTAT and friends */

STATIC int
xfs_bstime_store_compat(
        compat_xfs_bstime_t     __user *p32,
        const xfs_bstime_t      *p)
{
        __s32                   sec32;

        sec32 = p->tv_sec;
        if (put_user(sec32, &p32->tv_sec) ||
            put_user(p->tv_nsec, &p32->tv_nsec))
                return -EFAULT;
        return 0;
}

/* Return 0 on success or positive error (to xfs_bulkstat()) */
STATIC int
xfs_fsbulkstat_one_fmt_compat(
        struct xfs_ibulk                *breq,
        const struct xfs_bulkstat       *bstat)
{
        struct compat_xfs_bstat __user  *p32 = breq->ubuffer;
        struct xfs_bstat                bs1;
        struct xfs_bstat                *buffer = &bs1;

        xfs_bulkstat_to_bstat(breq->mp, &bs1, bstat);

        if (put_user(buffer->bs_ino,      &p32->bs_ino)         ||
            put_user(buffer->bs_mode,     &p32->bs_mode)        ||
            put_user(buffer->bs_nlink,    &p32->bs_nlink)       ||
            put_user(buffer->bs_uid,      &p32->bs_uid)         ||
            put_user(buffer->bs_gid,      &p32->bs_gid)         ||
            put_user(buffer->bs_rdev,     &p32->bs_rdev)        ||
            put_user(buffer->bs_blksize,  &p32->bs_blksize)     ||
            put_user(buffer->bs_size,     &p32->bs_size)        ||
            xfs_bstime_store_compat(&p32->bs_atime, &buffer->bs_atime) ||
            xfs_bstime_store_compat(&p32->bs_mtime, &buffer->bs_mtime) ||
            xfs_bstime_store_compat(&p32->bs_ctime, &buffer->bs_ctime) ||
            put_user(buffer->bs_blocks,   &p32->bs_blocks)      ||
            put_user(buffer->bs_xflags,   &p32->bs_xflags)      ||
            put_user(buffer->bs_extsize,  &p32->bs_extsize)     ||
            put_user(buffer->bs_extents,  &p32->bs_extents)     ||
            put_user(buffer->bs_gen,      &p32->bs_gen)         ||
            put_user(buffer->bs_projid,   &p32->bs_projid)      ||
            put_user(buffer->bs_projid_hi,      &p32->bs_projid_hi)     ||
            put_user(buffer->bs_forkoff,  &p32->bs_forkoff)     ||
            put_user(buffer->bs_dmevmask, &p32->bs_dmevmask)    ||
            put_user(buffer->bs_dmstate,  &p32->bs_dmstate)     ||
            put_user(buffer->bs_aextents, &p32->bs_aextents))
                return -EFAULT;

        return xfs_ibulk_advance(breq, sizeof(struct compat_xfs_bstat));
}

/* copied from xfs_ioctl.c */
STATIC int
xfs_compat_ioc_fsbulkstat(
        struct file             *file,
        unsigned int              cmd,
        struct compat_xfs_fsop_bulkreq __user *p32)
{
        struct xfs_mount        *mp = XFS_I(file_inode(file))->i_mount;
        u32                     addr;
        struct xfs_fsop_bulkreq bulkreq;
        struct xfs_ibulk        breq = {
                .mp             = mp,
                .mnt_userns     = file_mnt_user_ns(file),
                .ocount         = 0,
        };
        xfs_ino_t               lastino;
        int                     error;

        /*
         * Output structure handling functions.  Depending on the command,
         * either the xfs_bstat and xfs_inogrp structures are written out
         * to userpace memory via bulkreq.ubuffer.  Normally the compat
         * functions and structure size are the correct ones to use ...
         */
        inumbers_fmt_pf         inumbers_func = xfs_fsinumbers_fmt_compat;
        bulkstat_one_fmt_pf     bs_one_func = xfs_fsbulkstat_one_fmt_compat;

#ifdef CONFIG_X86_X32
        if (in_x32_syscall()) {
                /*
                 * ... but on x32 the input xfs_fsop_bulkreq has pointers
                 * which must be handled in the "compat" (32-bit) way, while
                 * the xfs_bstat and xfs_inogrp structures follow native 64-
                 * bit layout convention.  So adjust accordingly, otherwise
                 * the data written out in compat layout will not match what
                 * x32 userspace expects.
                 */
                inumbers_func = xfs_fsinumbers_fmt;
                bs_one_func = xfs_fsbulkstat_one_fmt;
        }
#endif

        /* done = 1 if there are more stats to get and if bulkstat */
        /* should be called again (unused here, but used in dmapi) */

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;

        if (xfs_is_shutdown(mp))
                return -EIO;

        if (get_user(addr, &p32->lastip))
                return -EFAULT;
        bulkreq.lastip = compat_ptr(addr);
        if (get_user(bulkreq.icount, &p32->icount) ||
            get_user(addr, &p32->ubuffer))
                return -EFAULT;
        bulkreq.ubuffer = compat_ptr(addr);
        if (get_user(addr, &p32->ocount))
                return -EFAULT;
        bulkreq.ocount = compat_ptr(addr);

        if (copy_from_user(&lastino, bulkreq.lastip, sizeof(__s64)))
                return -EFAULT;

        if (bulkreq.icount <= 0)
                return -EINVAL;

        if (bulkreq.ubuffer == NULL)
                return -EINVAL;

        breq.ubuffer = bulkreq.ubuffer;
        breq.icount = bulkreq.icount;

        /*
         * FSBULKSTAT_SINGLE expects that *lastip contains the inode number
         * that we want to stat.  However, FSINUMBERS and FSBULKSTAT expect
         * that *lastip contains either zero or the number of the last inode to
         * be examined by the previous call and return results starting with
         * the next inode after that.  The new bulk request back end functions
         * take the inode to start with, so we have to compute the startino
         * parameter from lastino to maintain correct function.  lastino == 0
         * is a special case because it has traditionally meant "first inode
         * in filesystem".
         */
        if (cmd == XFS_IOC_FSINUMBERS_32) {
                breq.startino = lastino ? lastino + 1 : 0;
                error = xfs_inumbers(&breq, inumbers_func);
                lastino = breq.startino - 1;
        } else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE_32) {
                breq.startino = lastino;
                breq.icount = 1;
                error = xfs_bulkstat_one(&breq, bs_one_func);
                lastino = breq.startino;
        } else if (cmd == XFS_IOC_FSBULKSTAT_32) {
                breq.startino = lastino ? lastino + 1 : 0;
                error = xfs_bulkstat(&breq, bs_one_func);
                lastino = breq.startino - 1;
        } else {
                error = -EINVAL;
        }
        if (error)
                return error;

        if (bulkreq.lastip != NULL &&
            copy_to_user(bulkreq.lastip, &lastino, sizeof(xfs_ino_t)))
                return -EFAULT;

        if (bulkreq.ocount != NULL &&
            copy_to_user(bulkreq.ocount, &breq.ocount, sizeof(__s32)))
                return -EFAULT;

        return 0;
}

STATIC int
xfs_compat_handlereq_copyin(
        xfs_fsop_handlereq_t            *hreq,
        compat_xfs_fsop_handlereq_t     __user *arg32)
{
        compat_xfs_fsop_handlereq_t     hreq32;

        if (copy_from_user(&hreq32, arg32, sizeof(compat_xfs_fsop_handlereq_t)))
                return -EFAULT;

        hreq->fd = hreq32.fd;
        hreq->path = compat_ptr(hreq32.path);
        hreq->oflags = hreq32.oflags;
        hreq->ihandle = compat_ptr(hreq32.ihandle);
        hreq->ihandlen = hreq32.ihandlen;
        hreq->ohandle = compat_ptr(hreq32.ohandle);
        hreq->ohandlen = compat_ptr(hreq32.ohandlen);

        return 0;
}

STATIC struct dentry *
xfs_compat_handlereq_to_dentry(
        struct file             *parfilp,
        compat_xfs_fsop_handlereq_t *hreq)
{
        return xfs_handle_to_dentry(parfilp,
                        compat_ptr(hreq->ihandle), hreq->ihandlen);
}

STATIC int
xfs_compat_attrlist_by_handle(
        struct file             *parfilp,
        compat_xfs_fsop_attrlist_handlereq_t __user *p)
{
        compat_xfs_fsop_attrlist_handlereq_t al_hreq;
        struct dentry           *dentry;
        int                     error;

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
        if (copy_from_user(&al_hreq, p, sizeof(al_hreq)))
                return -EFAULT;

        dentry = xfs_compat_handlereq_to_dentry(parfilp, &al_hreq.hreq);
        if (IS_ERR(dentry))
                return PTR_ERR(dentry);

        error = xfs_ioc_attr_list(XFS_I(d_inode(dentry)),
                        compat_ptr(al_hreq.buffer), al_hreq.buflen,
                        al_hreq.flags, &p->pos);
        dput(dentry);
        return error;
}

STATIC int
xfs_compat_attrmulti_by_handle(
        struct file                             *parfilp,
        void                                    __user *arg)
{
        int                                     error;
        compat_xfs_attr_multiop_t               *ops;
        compat_xfs_fsop_attrmulti_handlereq_t   am_hreq;
        struct dentry                           *dentry;
        unsigned int                            i, size;

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
        if (copy_from_user(&am_hreq, arg,
                           sizeof(compat_xfs_fsop_attrmulti_handlereq_t)))
                return -EFAULT;

        /* overflow check */
        if (am_hreq.opcount >= INT_MAX / sizeof(compat_xfs_attr_multiop_t))
                return -E2BIG;

        dentry = xfs_compat_handlereq_to_dentry(parfilp, &am_hreq.hreq);
        if (IS_ERR(dentry))
                return PTR_ERR(dentry);

        error = -E2BIG;
        size = am_hreq.opcount * sizeof(compat_xfs_attr_multiop_t);
        if (!size || size > 16 * PAGE_SIZE)
                goto out_dput;

        ops = memdup_user(compat_ptr(am_hreq.ops), size);
        if (IS_ERR(ops)) {
                error = PTR_ERR(ops);
                goto out_dput;
        }

        error = 0;
        for (i = 0; i < am_hreq.opcount; i++) {
                ops[i].am_error = xfs_ioc_attrmulti_one(parfilp,
                                d_inode(dentry), ops[i].am_opcode,
                                compat_ptr(ops[i].am_attrname),
                                compat_ptr(ops[i].am_attrvalue),
                                &ops[i].am_length, ops[i].am_flags);
        }

        if (copy_to_user(compat_ptr(am_hreq.ops), ops, size))
                error = -EFAULT;

        kfree(ops);
 out_dput:
        dput(dentry);
        return error;
}

long
xfs_file_compat_ioctl(
        struct file             *filp,
        unsigned                cmd,
        unsigned long           p)
{
        struct inode            *inode = file_inode(filp);
        struct xfs_inode        *ip = XFS_I(inode);
        void                    __user *arg = compat_ptr(p);
        int                     error;

        trace_xfs_file_compat_ioctl(ip);

        switch (cmd) {
#if defined(BROKEN_X86_ALIGNMENT)
        case XFS_IOC_ALLOCSP_32:
        case XFS_IOC_FREESP_32:
        case XFS_IOC_ALLOCSP64_32:
        case XFS_IOC_FREESP64_32: {
                struct xfs_flock64      bf;

                if (xfs_compat_flock64_copyin(&bf, arg))
                        return -EFAULT;
                cmd = _NATIVE_IOC(cmd, struct xfs_flock64);
                return xfs_ioc_space(filp, &bf);
        }
        case XFS_IOC_FSGEOMETRY_V1_32:
                return xfs_compat_ioc_fsgeometry_v1(ip->i_mount, arg);
        case XFS_IOC_FSGROWFSDATA_32: {
                struct xfs_growfs_data  in;

                if (xfs_compat_growfs_data_copyin(&in, arg))
                        return -EFAULT;
                error = mnt_want_write_file(filp);
                if (error)
                        return error;
                error = xfs_growfs_data(ip->i_mount, &in);
                mnt_drop_write_file(filp);
                return error;
        }
        case XFS_IOC_FSGROWFSRT_32: {
                struct xfs_growfs_rt    in;

                if (xfs_compat_growfs_rt_copyin(&in, arg))
                        return -EFAULT;
                error = mnt_want_write_file(filp);
                if (error)
                        return error;
                error = xfs_growfs_rt(ip->i_mount, &in);
                mnt_drop_write_file(filp);
                return error;
        }
#endif
        /* long changes size, but xfs only copiese out 32 bits */
        case XFS_IOC_GETVERSION_32:
                cmd = _NATIVE_IOC(cmd, long);
                return xfs_file_ioctl(filp, cmd, p);
        case XFS_IOC_SWAPEXT_32: {
                struct xfs_swapext        sxp;
                struct compat_xfs_swapext __user *sxu = arg;

                /* Bulk copy in up to the sx_stat field, then copy bstat */
                if (copy_from_user(&sxp, sxu,
                                   offsetof(struct xfs_swapext, sx_stat)) ||
                    xfs_ioctl32_bstat_copyin(&sxp.sx_stat, &sxu->sx_stat))
                        return -EFAULT;
                error = mnt_want_write_file(filp);
                if (error)
                        return error;
                error = xfs_ioc_swapext(&sxp);
                mnt_drop_write_file(filp);
                return error;
        }
        case XFS_IOC_FSBULKSTAT_32:
        case XFS_IOC_FSBULKSTAT_SINGLE_32:
        case XFS_IOC_FSINUMBERS_32:
                return xfs_compat_ioc_fsbulkstat(filp, cmd, arg);
        case XFS_IOC_FD_TO_HANDLE_32:
        case XFS_IOC_PATH_TO_HANDLE_32:
        case XFS_IOC_PATH_TO_FSHANDLE_32: {
                struct xfs_fsop_handlereq       hreq;

                if (xfs_compat_handlereq_copyin(&hreq, arg))
                        return -EFAULT;
                cmd = _NATIVE_IOC(cmd, struct xfs_fsop_handlereq);
                return xfs_find_handle(cmd, &hreq);
        }
        case XFS_IOC_OPEN_BY_HANDLE_32: {
                struct xfs_fsop_handlereq       hreq;

                if (xfs_compat_handlereq_copyin(&hreq, arg))
                        return -EFAULT;
                return xfs_open_by_handle(filp, &hreq);
        }
        case XFS_IOC_READLINK_BY_HANDLE_32: {
                struct xfs_fsop_handlereq       hreq;

                if (xfs_compat_handlereq_copyin(&hreq, arg))
                        return -EFAULT;
                return xfs_readlink_by_handle(filp, &hreq);
        }
        case XFS_IOC_ATTRLIST_BY_HANDLE_32:
                return xfs_compat_attrlist_by_handle(filp, arg);
        case XFS_IOC_ATTRMULTI_BY_HANDLE_32:
                return xfs_compat_attrmulti_by_handle(filp, arg);
        default:
                /* try the native version */
                return xfs_file_ioctl(filp, cmd, (unsigned long)arg);
        }
}