[people/ms/linux.git] / fs / cifs / ioctl.c

// SPDX-License-Identifier: LGPL-2.1
/*
 *
 *   vfs operations that deal with io control
 *
 *   Copyright (C) International Business Machines  Corp., 2005,2013
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 */

#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifsfs.h"
#include "cifs_ioctl.h"
#include "smb2proto.h"
#include "smb2glob.h"
#include <linux/btrfs.h>

static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
				  unsigned long p)
{
	struct inode *inode = file_inode(filep);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
	struct dentry *dentry = filep->f_path.dentry;
	const unsigned char *path;
	void *page = alloc_dentry_path();
	__le16 *utf16_path = NULL, root_path;
	int rc = 0;

	path = build_path_from_dentry(dentry, page);
	if (IS_ERR(path)) {
		free_dentry_path(page);
		return PTR_ERR(path);
	}

	cifs_dbg(FYI, "%s %s\n", __func__, path);

	if (!path[0]) {
		root_path = 0;
		utf16_path = &root_path;
	} else {
		utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
		if (!utf16_path) {
			rc = -ENOMEM;
			goto ici_exit;
		}
	}

	if (tcon->ses->server->ops->ioctl_query_info)
		rc = tcon->ses->server->ops->ioctl_query_info(
				xid, tcon, cifs_sb, utf16_path,
				filep->private_data ? 0 : 1, p);
	else
		rc = -EOPNOTSUPP;

 ici_exit:
	if (utf16_path != &root_path)
		kfree(utf16_path);
	free_dentry_path(page);
	return rc;
}

static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
			unsigned long srcfd)
{
	int rc;
	struct fd src_file;
	struct inode *src_inode;

	cifs_dbg(FYI, "ioctl copychunk range\n");
	/* the destination must be opened for writing */
	if (!(dst_file->f_mode & FMODE_WRITE)) {
		cifs_dbg(FYI, "file target not open for write\n");
		return -EINVAL;
	}

	/* check if target volume is readonly and take reference */
	rc = mnt_want_write_file(dst_file);
	if (rc) {
		cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
		return rc;
	}

	src_file = fdget(srcfd);
	if (!src_file.file) {
		rc = -EBADF;
		goto out_drop_write;
	}

	if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
		rc = -EBADF;
		cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
		goto out_fput;
	}

	src_inode = file_inode(src_file.file);
	rc = -EINVAL;
	if (S_ISDIR(src_inode->i_mode))
		goto out_fput;

	rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
					src_inode->i_size, 0);
	if (rc > 0)
		rc = 0;
out_fput:
	fdput(src_file);
out_drop_write:
	mnt_drop_write_file(dst_file);
	return rc;
}

static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
				void __user *arg)
{
	int rc = 0;
	struct smb_mnt_fs_info *fsinf;

	fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
	if (fsinf == NULL)
		return -ENOMEM;

	fsinf->version = 1;
	fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
	fsinf->device_characteristics =
			le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
	fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
	fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
	fsinf->max_path_component =
		le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
	fsinf->vol_serial_number = tcon->vol_serial_number;
	fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
	fsinf->share_flags = tcon->share_flags;
	fsinf->share_caps = le32_to_cpu(tcon->capabilities);
	fsinf->sector_flags = tcon->ss_flags;
	fsinf->optimal_sector_size = tcon->perf_sector_size;
	fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
	fsinf->maximal_access = tcon->maximal_access;
	fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);

	if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
		rc = -EFAULT;

	kfree(fsinf);
	return rc;
}

static int cifs_shutdown(struct super_block *sb, unsigned long arg)
{
	struct cifs_sb_info *sbi = CIFS_SB(sb);
	__u32 flags;

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

	if (get_user(flags, (__u32 __user *)arg))
		return -EFAULT;

	if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH)
		return -EINVAL;

	if (cifs_forced_shutdown(sbi))
		return 0;

	cifs_dbg(VFS, "shut down requested (%d)", flags);
/*	trace_cifs_shutdown(sb, flags);*/

	/*
	 * see:
	 *   https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html
	 * for more information and description of original intent of the flags
	 */
	switch (flags) {
	/*
	 * We could add support later for default flag which requires:
	 *     "Flush all dirty data and metadata to disk"
	 * would need to call syncfs or equivalent to flush page cache for
	 * the mount and then issue fsync to server (if nostrictsync not set)
	 */
	case CIFS_GOING_FLAGS_DEFAULT:
		cifs_dbg(FYI, "shutdown with default flag not supported\n");
		return -EINVAL;
	/*
	 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not
	 * data) but metadata writes are not cached on the client, so can treat
	 * it similarly to NOLOGFLUSH
	 */
	case CIFS_GOING_FLAGS_LOGFLUSH:
	case CIFS_GOING_FLAGS_NOLOGFLUSH:
		sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN;
		return 0;
	default:
		return -EINVAL;
	}
	return 0;
}

static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in)
{
	struct smb3_full_key_debug_info out;
	struct cifs_ses *ses;
	int rc = 0;
	bool found = false;
	u8 __user *end;

	if (!smb3_encryption_required(tcon)) {
		rc = -EOPNOTSUPP;
		goto out;
	}

	/* copy user input into our output buffer */
	if (copy_from_user(&out, in, sizeof(out))) {
		rc = -EINVAL;
		goto out;
	}

	if (!out.session_id) {
		/* if ses id is 0, use current user session */
		ses = tcon->ses;
	} else {
		/* otherwise if a session id is given, look for it in all our sessions */
		struct cifs_ses *ses_it = NULL;
		struct TCP_Server_Info *server_it = NULL;

		spin_lock(&cifs_tcp_ses_lock);
		list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) {
			list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) {
				if (ses_it->Suid == out.session_id) {
					ses = ses_it;
					/*
					 * since we are using the session outside the crit
					 * section, we need to make sure it won't be released
					 * so increment its refcount
					 */
					ses->ses_count++;
					found = true;
					goto search_end;
				}
			}
		}
search_end:
		spin_unlock(&cifs_tcp_ses_lock);
		if (!found) {
			rc = -ENOENT;
			goto out;
		}
	}

	switch (ses->server->cipher_type) {
	case SMB2_ENCRYPTION_AES128_CCM:
	case SMB2_ENCRYPTION_AES128_GCM:
		out.session_key_length = CIFS_SESS_KEY_SIZE;
		out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE;
		break;
	case SMB2_ENCRYPTION_AES256_CCM:
	case SMB2_ENCRYPTION_AES256_GCM:
		out.session_key_length = CIFS_SESS_KEY_SIZE;
		out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE;
		break;
	default:
		rc = -EOPNOTSUPP;
		goto out;
	}

	/* check if user buffer is big enough to store all the keys */
	if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length
	    + out.server_out_key_length) {
		rc = -ENOBUFS;
		goto out;
	}

	out.session_id = ses->Suid;
	out.cipher_type = le16_to_cpu(ses->server->cipher_type);

	/* overwrite user input with our output */
	if (copy_to_user(in, &out, sizeof(out))) {
		rc = -EINVAL;
		goto out;
	}

	/* append all the keys at the end of the user buffer */
	end = in->data;
	if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) {
		rc = -EINVAL;
		goto out;
	}
	end += out.session_key_length;

	if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) {
		rc = -EINVAL;
		goto out;
	}
	end += out.server_in_key_length;

	if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) {
		rc = -EINVAL;
		goto out;
	}

out:
	if (found)
		cifs_put_smb_ses(ses);
	return rc;
}

long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
{
	struct inode *inode = file_inode(filep);
	struct smb3_key_debug_info pkey_inf;
	int rc = -ENOTTY; /* strange error - but the precedent */
	unsigned int xid;
	struct cifsFileInfo *pSMBFile = filep->private_data;
	struct cifs_tcon *tcon;
	struct tcon_link *tlink;
	struct cifs_sb_info *cifs_sb;
	__u64	ExtAttrBits = 0;
	__u64   caps;

	xid = get_xid();

	cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
	switch (command) {
		case FS_IOC_GETFLAGS:
			if (pSMBFile == NULL)
				break;
			tcon = tlink_tcon(pSMBFile->tlink);
			caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
#ifdef CONFIG_CIFS_POSIX
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
			if (CIFS_UNIX_EXTATTR_CAP & caps) {
				__u64	ExtAttrMask = 0;
				rc = CIFSGetExtAttr(xid, tcon,
						    pSMBFile->fid.netfid,
						    &ExtAttrBits, &ExtAttrMask);
				if (rc == 0)
					rc = put_user(ExtAttrBits &
						FS_FL_USER_VISIBLE,
						(int __user *)arg);
				if (rc != EOPNOTSUPP)
					break;
			}
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
#endif /* CONFIG_CIFS_POSIX */
			rc = 0;
			if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
				/* add in the compressed bit */
				ExtAttrBits = FS_COMPR_FL;
				rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
					      (int __user *)arg);
			}
			break;
		case FS_IOC_SETFLAGS:
			if (pSMBFile == NULL)
				break;
			tcon = tlink_tcon(pSMBFile->tlink);
			/* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */

			if (get_user(ExtAttrBits, (int __user *)arg)) {
				rc = -EFAULT;
				break;
			}

			/*
			 * if (CIFS_UNIX_EXTATTR_CAP & caps)
			 *	rc = CIFSSetExtAttr(xid, tcon,
			 *		       pSMBFile->fid.netfid,
			 *		       extAttrBits,
			 *		       &ExtAttrMask);
			 * if (rc != EOPNOTSUPP)
			 *	break;
			 */

			/* Currently only flag we can set is compressed flag */
			if ((ExtAttrBits & FS_COMPR_FL) == 0)
				break;

			/* Try to set compress flag */
			if (tcon->ses->server->ops->set_compression) {
				rc = tcon->ses->server->ops->set_compression(
							xid, tcon, pSMBFile);
				cifs_dbg(FYI, "set compress flag rc %d\n", rc);
			}
			break;
		case CIFS_IOC_COPYCHUNK_FILE:
			rc = cifs_ioctl_copychunk(xid, filep, arg);
			break;
		case CIFS_QUERY_INFO:
			rc = cifs_ioctl_query_info(xid, filep, arg);
			break;
		case CIFS_IOC_SET_INTEGRITY:
			if (pSMBFile == NULL)
				break;
			tcon = tlink_tcon(pSMBFile->tlink);
			if (tcon->ses->server->ops->set_integrity)
				rc = tcon->ses->server->ops->set_integrity(xid,
						tcon, pSMBFile);
			else
				rc = -EOPNOTSUPP;
			break;
		case CIFS_IOC_GET_MNT_INFO:
			if (pSMBFile == NULL)
				break;
			tcon = tlink_tcon(pSMBFile->tlink);
			rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
			break;
		case CIFS_ENUMERATE_SNAPSHOTS:
			if (pSMBFile == NULL)
				break;
			if (arg == 0) {
				rc = -EINVAL;
				goto cifs_ioc_exit;
			}
			tcon = tlink_tcon(pSMBFile->tlink);
			if (tcon->ses->server->ops->enum_snapshots)
				rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
						pSMBFile, (void __user *)arg);
			else
				rc = -EOPNOTSUPP;
			break;
		case CIFS_DUMP_KEY:
			/*
			 * Dump encryption keys. This is an old ioctl that only
			 * handles AES-128-{CCM,GCM}.
			 */
			if (pSMBFile == NULL)
				break;
			if (!capable(CAP_SYS_ADMIN)) {
				rc = -EACCES;
				break;
			}

			tcon = tlink_tcon(pSMBFile->tlink);
			if (!smb3_encryption_required(tcon)) {
				rc = -EOPNOTSUPP;
				break;
			}
			pkey_inf.cipher_type =
				le16_to_cpu(tcon->ses->server->cipher_type);
			pkey_inf.Suid = tcon->ses->Suid;
			memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
					16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
			memcpy(pkey_inf.smb3decryptionkey,
			      tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
			memcpy(pkey_inf.smb3encryptionkey,
			      tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
			if (copy_to_user((void __user *)arg, &pkey_inf,
					sizeof(struct smb3_key_debug_info)))
				rc = -EFAULT;
			else
				rc = 0;
			break;
		case CIFS_DUMP_FULL_KEY:
			/*
			 * Dump encryption keys (handles any key sizes)
			 */
			if (pSMBFile == NULL)
				break;
			if (!capable(CAP_SYS_ADMIN)) {
				rc = -EACCES;
				break;
			}
			tcon = tlink_tcon(pSMBFile->tlink);
			rc = cifs_dump_full_key(tcon, (void __user *)arg);
			break;
		case CIFS_IOC_NOTIFY:
			if (!S_ISDIR(inode->i_mode)) {
				/* Notify can only be done on directories */
				rc = -EOPNOTSUPP;
				break;
			}
			cifs_sb = CIFS_SB(inode->i_sb);
			tlink = cifs_sb_tlink(cifs_sb);
			if (IS_ERR(tlink)) {
				rc = PTR_ERR(tlink);
				break;
			}
			tcon = tlink_tcon(tlink);
			if (tcon && tcon->ses->server->ops->notify) {
				rc = tcon->ses->server->ops->notify(xid,
						filep, (void __user *)arg);
				cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
			} else
				rc = -EOPNOTSUPP;
			cifs_put_tlink(tlink);
			break;
		case CIFS_IOC_SHUTDOWN:
			rc = cifs_shutdown(inode->i_sb, arg);
			break;
		default:
			cifs_dbg(FYI, "unsupported ioctl\n");
			break;
	}
cifs_ioc_exit:
	free_xid(xid);
	return rc;
}
Commit	Line	Data
929be906	1	// SPDX-License-Identifier: LGPL-2.1
1da177e4	2	/*
1da177e4 LT	3	*
	4	* vfs operations that deal with io control
	5	*
64a5cfa6	6	* Copyright (C) International Business Machines Corp., 2005,2013
1da177e4 LT	7	* Author(s): Steve French (sfrench@us.ibm.com)
1da177e4 LT	8	*
1da177e4	9	*/
f654bac2	10
1da177e4	11	#include <linux/fs.h>
41c1358e SF	12	#include <linux/file.h>
	13	#include <linux/mount.h>
	14	#include <linux/mm.h>
	15	#include <linux/pagemap.h>
1da177e4 LT	16	#include "cifspdu.h"
	17	#include "cifsglob.h"
	18	#include "cifsproto.h"
	19	#include "cifs_debug.h"
c67593a0	20	#include "cifsfs.h"
0de1f4c6	21	#include "cifs_ioctl.h"
8d8b26e5	22	#include "smb2proto.h"
1bb56810	23	#include "smb2glob.h"
02b16665	24	#include <linux/btrfs.h>
1da177e4	25
f5b05d62 RS	26	static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
	27	unsigned long p)
	28	{
8d8b26e5 RS	29	struct inode *inode = file_inode(filep);
	30	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	31	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
	32	struct dentry *dentry = filep->f_path.dentry;
8e33cf20	33	const unsigned char *path;
f6a9bc33	34	void *page = alloc_dentry_path();
8d8b26e5 RS	35	__le16 *utf16_path = NULL, root_path;
8d8b26e5 RS	36	int rc = 0;
f5b05d62	37
f6a9bc33 AV	38	path = build_path_from_dentry(dentry, page);
	39	if (IS_ERR(path)) {
	40	free_dentry_path(page);
	41	return PTR_ERR(path);
	42	}
8d8b26e5 RS	43
	44	cifs_dbg(FYI, "%s %s\n", __func__, path);
	45
	46	if (!path[0]) {
	47	root_path = 0;
	48	utf16_path = &root_path;
	49	} else {
	50	utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
	51	if (!utf16_path) {
	52	rc = -ENOMEM;
	53	goto ici_exit;
	54	}
	55	}
f5b05d62 RS	56
f5b05d62 RS	57	if (tcon->ses->server->ops->ioctl_query_info)
8d8b26e5	58	rc = tcon->ses->server->ops->ioctl_query_info(
0f060936	59	xid, tcon, cifs_sb, utf16_path,
8d8b26e5	60	filep->private_data ? 0 : 1, p);
f5b05d62	61	else
8d8b26e5 RS	62	rc = -EOPNOTSUPP;
	63
	64	ici_exit:
	65	if (utf16_path != &root_path)
	66	kfree(utf16_path);
f6a9bc33	67	free_dentry_path(page);
8d8b26e5	68	return rc;
f5b05d62 RS	69	}
f5b05d62 RS	70
312bbc59	71	static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
04b38d60 CH	72	unsigned long srcfd)
	73	{
	74	int rc;
	75	struct fd src_file;
	76	struct inode *src_inode;
	77
312bbc59	78	cifs_dbg(FYI, "ioctl copychunk range\n");
04b38d60 CH	79	/* the destination must be opened for writing */
	80	if (!(dst_file->f_mode & FMODE_WRITE)) {
	81	cifs_dbg(FYI, "file target not open for write\n");
	82	return -EINVAL;
	83	}
	84
	85	/* check if target volume is readonly and take reference */
	86	rc = mnt_want_write_file(dst_file);
	87	if (rc) {
	88	cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
	89	return rc;
	90	}
	91
	92	src_file = fdget(srcfd);
	93	if (!src_file.file) {
	94	rc = -EBADF;
	95	goto out_drop_write;
	96	}
	97
	98	if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
	99	rc = -EBADF;
	100	cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
	101	goto out_fput;
	102	}
	103
	104	src_inode = file_inode(src_file.file);
	105	rc = -EINVAL;
	106	if (S_ISDIR(src_inode->i_mode))
	107	goto out_fput;
	108
620d8745 SP	109	rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
620d8745 SP	110	src_inode->i_size, 0);
7d0c234f SP	111	if (rc > 0)
7d0c234f SP	112	rc = 0;
41c1358e SF	113	out_fput:
	114	fdput(src_file);
	115	out_drop_write:
	116	mnt_drop_write_file(dst_file);
	117	return rc;
	118	}
	119
0de1f4c6 SF	120	static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
	121	void __user *arg)
	122	{
	123	int rc = 0;
	124	struct smb_mnt_fs_info *fsinf;
	125
	126	fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
	127	if (fsinf == NULL)
	128	return -ENOMEM;
	129
	130	fsinf->version = 1;
	131	fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
	132	fsinf->device_characteristics =
	133	le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
	134	fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
	135	fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
	136	fsinf->max_path_component =
	137	le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
0de1f4c6 SF	138	fsinf->vol_serial_number = tcon->vol_serial_number;
	139	fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
	140	fsinf->share_flags = tcon->share_flags;
	141	fsinf->share_caps = le32_to_cpu(tcon->capabilities);
	142	fsinf->sector_flags = tcon->ss_flags;
	143	fsinf->optimal_sector_size = tcon->perf_sector_size;
	144	fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
	145	fsinf->maximal_access = tcon->maximal_access;
0de1f4c6 SF	146	fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
	147
	148	if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
	149	rc = -EFAULT;
	150
	151	kfree(fsinf);
	152	return rc;
	153	}
	154
087f757b SF	155	static int cifs_shutdown(struct super_block *sb, unsigned long arg)
	156	{
	157	struct cifs_sb_info *sbi = CIFS_SB(sb);
	158	__u32 flags;
	159
	160	if (!capable(CAP_SYS_ADMIN))
	161	return -EPERM;
	162
	163	if (get_user(flags, (__u32 __user *)arg))
	164	return -EFAULT;
	165
	166	if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH)
	167	return -EINVAL;
	168
	169	if (cifs_forced_shutdown(sbi))
	170	return 0;
	171
	172	cifs_dbg(VFS, "shut down requested (%d)", flags);
	173	/* trace_cifs_shutdown(sb, flags);*/
	174
	175	/*
	176	* see:
	177	* https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html
	178	* for more information and description of original intent of the flags
	179	*/
	180	switch (flags) {
	181	/*
	182	* We could add support later for default flag which requires:
	183	* "Flush all dirty data and metadata to disk"
	184	* would need to call syncfs or equivalent to flush page cache for
	185	* the mount and then issue fsync to server (if nostrictsync not set)
	186	*/
	187	case CIFS_GOING_FLAGS_DEFAULT:
	188	cifs_dbg(FYI, "shutdown with default flag not supported\n");
	189	return -EINVAL;
	190	/*
	191	* FLAGS_LOGFLUSH is easy since it asks to write out metadata (not
	192	* data) but metadata writes are not cached on the client, so can treat
	193	* it similarly to NOLOGFLUSH
	194	*/
	195	case CIFS_GOING_FLAGS_LOGFLUSH:
	196	case CIFS_GOING_FLAGS_NOLOGFLUSH:
	197	sbi->mnt_cifs_flags \|= CIFS_MOUNT_SHUTDOWN;
	198	return 0;
	199	default:
	200	return -EINVAL;
	201	}
	202	return 0;
	203	}
	204
1bb56810	205	static int cifs_dump_full_key(struct cifs_tcon tcon, struct smb3_full_key_debug_info __user in)
7ba3d1cd	206	{
1bb56810	207	struct smb3_full_key_debug_info out;
7ba3d1cd	208	struct cifs_ses *ses;
1bb56810	209	int rc = 0;
7ba3d1cd	210	bool found = false;
1bb56810	211	u8 __user *end;
7ba3d1cd	212
1bb56810 AA	213	if (!smb3_encryption_required(tcon)) {
	214	rc = -EOPNOTSUPP;
	215	goto out;
	216	}
	217
	218	/* copy user input into our output buffer */
	219	if (copy_from_user(&out, in, sizeof(out))) {
	220	rc = -EINVAL;
	221	goto out;
	222	}
	223
	224	if (!out.session_id) {
	225	/* if ses id is 0, use current user session */
	226	ses = tcon->ses;
	227	} else {
	228	/* otherwise if a session id is given, look for it in all our sessions */
	229	struct cifs_ses *ses_it = NULL;
	230	struct TCP_Server_Info *server_it = NULL;
7ba3d1cd	231
7ba3d1cd	232	spin_lock(&cifs_tcp_ses_lock);
1bb56810 AA	233	list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) {
	234	list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) {
	235	if (ses_it->Suid == out.session_id) {
	236	ses = ses_it;
	237	/*
	238	* since we are using the session outside the crit
	239	* section, we need to make sure it won't be released
	240	* so increment its refcount
	241	*/
	242	ses->ses_count++;
	243	found = true;
	244	goto search_end;
	245	}
7ba3d1cd SF	246	}
7ba3d1cd SF	247	}
1bb56810	248	search_end:
7ba3d1cd	249	spin_unlock(&cifs_tcp_ses_lock);
1bb56810 AA	250	if (!found) {
	251	rc = -ENOENT;
	252	goto out;
	253	}
	254	}
7ba3d1cd	255
1bb56810 AA	256	switch (ses->server->cipher_type) {
	257	case SMB2_ENCRYPTION_AES128_CCM:
	258	case SMB2_ENCRYPTION_AES128_GCM:
	259	out.session_key_length = CIFS_SESS_KEY_SIZE;
	260	out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE;
	261	break;
	262	case SMB2_ENCRYPTION_AES256_CCM:
	263	case SMB2_ENCRYPTION_AES256_GCM:
	264	out.session_key_length = CIFS_SESS_KEY_SIZE;
	265	out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE;
	266	break;
	267	default:
	268	rc = -EOPNOTSUPP;
	269	goto out;
	270	}
	271
	272	/* check if user buffer is big enough to store all the keys */
	273	if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length
	274	+ out.server_out_key_length) {
	275	rc = -ENOBUFS;
	276	goto out;
	277	}
	278
	279	out.session_id = ses->Suid;
	280	out.cipher_type = le16_to_cpu(ses->server->cipher_type);
	281
	282	/* overwrite user input with our output */
	283	if (copy_to_user(in, &out, sizeof(out))) {
	284	rc = -EINVAL;
	285	goto out;
	286	}
	287
	288	/* append all the keys at the end of the user buffer */
	289	end = in->data;
	290	if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) {
	291	rc = -EINVAL;
	292	goto out;
	293	}
	294	end += out.session_key_length;
	295
	296	if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) {
	297	rc = -EINVAL;
	298	goto out;
	299	}
	300	end += out.server_in_key_length;
	301
	302	if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) {
	303	rc = -EINVAL;
	304	goto out;
	305	}
	306
	307	out:
	308	if (found)
	309	cifs_put_smb_ses(ses);
	310	return rc;
7ba3d1cd SF	311	}
7ba3d1cd SF	312
f9ddcca4	313	long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
1da177e4	314	{
496ad9aa	315	struct inode *inode = file_inode(filep);
7e7db86c	316	struct smb3_key_debug_info pkey_inf;
1da177e4	317	int rc = -ENOTTY; /* strange error - but the precedent */
6d5786a3	318	unsigned int xid;
ba00ba64	319	struct cifsFileInfo *pSMBFile = filep->private_data;
96daf2b0	320	struct cifs_tcon *tcon;
a77592a7	321	struct tcon_link *tlink;
d26c2ddd	322	struct cifs_sb_info *cifs_sb;
f654bac2	323	__u64 ExtAttrBits = 0;
61876395	324	__u64 caps;
f654bac2	325
6d5786a3	326	xid = get_xid();
f654bac2	327
b0a752b5	328	cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
5fdae1f6	329	switch (command) {
36695673	330	case FS_IOC_GETFLAGS:
61876395 JL	331	if (pSMBFile == NULL)
	332	break;
	333	tcon = tlink_tcon(pSMBFile->tlink);
	334	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
64a5cfa6	335	#ifdef CONFIG_CIFS_POSIX
fb157ed2	336	#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
5fdae1f6	337	if (CIFS_UNIX_EXTATTR_CAP & caps) {
f10d9ba4	338	__u64 ExtAttrMask = 0;
4b4de76e PS	339	rc = CIFSGetExtAttr(xid, tcon,
	340	pSMBFile->fid.netfid,
	341	&ExtAttrBits, &ExtAttrMask);
5fdae1f6	342	if (rc == 0)
f654bac2	343	rc = put_user(ExtAttrBits &
36695673	344	FS_FL_USER_VISIBLE,
f654bac2	345	(int __user *)arg);
64a5cfa6 SF	346	if (rc != EOPNOTSUPP)
	347	break;
	348	}
fb157ed2	349	#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
64a5cfa6 SF	350	#endif /* CONFIG_CIFS_POSIX */
	351	rc = 0;
	352	if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
	353	/* add in the compressed bit */
	354	ExtAttrBits = FS_COMPR_FL;
	355	rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
	356	(int __user *)arg);
f654bac2 SF	357	}
f654bac2 SF	358	break;
36695673	359	case FS_IOC_SETFLAGS:
61876395 JL	360	if (pSMBFile == NULL)
	361	break;
	362	tcon = tlink_tcon(pSMBFile->tlink);
4c51de1e	363	/* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */
64a5cfa6 SF	364
	365	if (get_user(ExtAttrBits, (int __user *)arg)) {
	366	rc = -EFAULT;
	367	break;
	368	}
	369
	370	/*
	371	* if (CIFS_UNIX_EXTATTR_CAP & caps)
	372	* rc = CIFSSetExtAttr(xid, tcon,
	373	* pSMBFile->fid.netfid,
	374	* extAttrBits,
	375	* &ExtAttrMask);
	376	* if (rc != EOPNOTSUPP)
	377	* break;
	378	*/
	379
	380	/* Currently only flag we can set is compressed flag */
	381	if ((ExtAttrBits & FS_COMPR_FL) == 0)
	382	break;
	383
	384	/* Try to set compress flag */
	385	if (tcon->ses->server->ops->set_compression) {
	386	rc = tcon->ses->server->ops->set_compression(
	387	xid, tcon, pSMBFile);
	388	cifs_dbg(FYI, "set compress flag rc %d\n", rc);
f654bac2	389	}
f654bac2	390	break;
f19e84df	391	case CIFS_IOC_COPYCHUNK_FILE:
312bbc59	392	rc = cifs_ioctl_copychunk(xid, filep, arg);
41c1358e	393	break;
f5b05d62 RS	394	case CIFS_QUERY_INFO:
	395	rc = cifs_ioctl_query_info(xid, filep, arg);
	396	break;
b3152e2c SF	397	case CIFS_IOC_SET_INTEGRITY:
	398	if (pSMBFile == NULL)
	399	break;
	400	tcon = tlink_tcon(pSMBFile->tlink);
	401	if (tcon->ses->server->ops->set_integrity)
	402	rc = tcon->ses->server->ops->set_integrity(xid,
	403	tcon, pSMBFile);
	404	else
	405	rc = -EOPNOTSUPP;
	406	break;
0de1f4c6	407	case CIFS_IOC_GET_MNT_INFO:
d8a6e505 DD	408	if (pSMBFile == NULL)
d8a6e505 DD	409	break;
0de1f4c6 SF	410	tcon = tlink_tcon(pSMBFile->tlink);
	411	rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
	412	break;
834170c8	413	case CIFS_ENUMERATE_SNAPSHOTS:
6026685d DD	414	if (pSMBFile == NULL)
6026685d DD	415	break;
834170c8 SF	416	if (arg == 0) {
	417	rc = -EINVAL;
	418	goto cifs_ioc_exit;
	419	}
	420	tcon = tlink_tcon(pSMBFile->tlink);
	421	if (tcon->ses->server->ops->enum_snapshots)
	422	rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
	423	pSMBFile, (void __user *)arg);
	424	else
	425	rc = -EOPNOTSUPP;
	426	break;
7e7db86c	427	case CIFS_DUMP_KEY:
1bb56810 AA	428	/*
	429	* Dump encryption keys. This is an old ioctl that only
	430	* handles AES-128-{CCM,GCM}.
	431	*/
7e7db86c SF	432	if (pSMBFile == NULL)
	433	break;
	434	if (!capable(CAP_SYS_ADMIN)) {
	435	rc = -EACCES;
	436	break;
	437	}
	438
	439	tcon = tlink_tcon(pSMBFile->tlink);
	440	if (!smb3_encryption_required(tcon)) {
	441	rc = -EOPNOTSUPP;
	442	break;
	443	}
	444	pkey_inf.cipher_type =
	445	le16_to_cpu(tcon->ses->server->cipher_type);
	446	pkey_inf.Suid = tcon->ses->Suid;
	447	memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
	448	16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
	449	memcpy(pkey_inf.smb3decryptionkey,
	450	tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
	451	memcpy(pkey_inf.smb3encryptionkey,
	452	tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
	453	if (copy_to_user((void __user *)arg, &pkey_inf,
	454	sizeof(struct smb3_key_debug_info)))
	455	rc = -EFAULT;
	456	else
	457	rc = 0;
	458	break;
aa22ebc3	459	case CIFS_DUMP_FULL_KEY:
1bb56810 AA	460	/*
	461	* Dump encryption keys (handles any key sizes)
	462	*/
aa22ebc3 SF	463	if (pSMBFile == NULL)
	464	break;
	465	if (!capable(CAP_SYS_ADMIN)) {
	466	rc = -EACCES;
	467	break;
	468	}
aa22ebc3	469	tcon = tlink_tcon(pSMBFile->tlink);
1bb56810	470	rc = cifs_dump_full_key(tcon, (void __user *)arg);
aa22ebc3	471	break;
d26c2ddd SF	472	case CIFS_IOC_NOTIFY:
	473	if (!S_ISDIR(inode->i_mode)) {
	474	/* Notify can only be done on directories */
	475	rc = -EOPNOTSUPP;
	476	break;
	477	}
	478	cifs_sb = CIFS_SB(inode->i_sb);
a77592a7 RS	479	tlink = cifs_sb_tlink(cifs_sb);
	480	if (IS_ERR(tlink)) {
	481	rc = PTR_ERR(tlink);
	482	break;
	483	}
	484	tcon = tlink_tcon(tlink);
d26c2ddd SF	485	if (tcon && tcon->ses->server->ops->notify) {
	486	rc = tcon->ses->server->ops->notify(xid,
	487	filep, (void __user *)arg);
	488	cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
	489	} else
	490	rc = -EOPNOTSUPP;
a77592a7	491	cifs_put_tlink(tlink);
d26c2ddd	492	break;
087f757b SF	493	case CIFS_IOC_SHUTDOWN:
	494	rc = cifs_shutdown(inode->i_sb, arg);
	495	break;
1da177e4	496	default:
f96637be	497	cifs_dbg(FYI, "unsupported ioctl\n");
f28ac91b	498	break;
1da177e4	499	}
834170c8	500	cifs_ioc_exit:
6d5786a3	501	free_xid(xid);
1da177e4	502	return rc;
5fdae1f6	503	}