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1// SPDX-License-Identifier: LGPL-2.12/*3 *4 * vfs operations that deal with io control5 *6 * Copyright (C) International Business Machines Corp., 2005,20137 * Author(s): Steve French (sfrench@us.ibm.com)8 *9 */10 11#include <linux/fs.h>12#include <linux/file.h>13#include <linux/mount.h>14#include <linux/mm.h>15#include <linux/pagemap.h>16#include "cifspdu.h"17#include "cifsglob.h"18#include "cifsproto.h"19#include "cifs_debug.h"20#include "cifsfs.h"21#include "cifs_ioctl.h"22#include "smb2proto.h"23#include "smb2glob.h"24#include <linux/btrfs.h>25 26static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,27 unsigned long p)28{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;33 const unsigned char *path;34 void *page = alloc_dentry_path();35 __le16 *utf16_path = NULL, root_path;36 int rc = 0;37 38 path = build_path_from_dentry(dentry, page);39 if (IS_ERR(path)) {40 free_dentry_path(page);41 return PTR_ERR(path);42 }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 }56 57 if (tcon->ses->server->ops->ioctl_query_info)58 rc = tcon->ses->server->ops->ioctl_query_info(59 xid, tcon, cifs_sb, utf16_path,60 filep->private_data ? 0 : 1, p);61 else62 rc = -EOPNOTSUPP;63 64 ici_exit:65 if (utf16_path != &root_path)66 kfree(utf16_path);67 free_dentry_path(page);68 return rc;69}70 71static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,72 unsigned long srcfd)73{74 int rc;75 struct fd src_file;76 struct inode *src_inode;77 78 cifs_dbg(FYI, "ioctl copychunk range\n");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 (!fd_file(src_file)) {94 rc = -EBADF;95 goto out_drop_write;96 }97 98 if (fd_file(src_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(fd_file(src_file));105 rc = -EINVAL;106 if (S_ISDIR(src_inode->i_mode))107 goto out_fput;108 109 rc = cifs_file_copychunk_range(xid, fd_file(src_file), 0, dst_file, 0,110 src_inode->i_size, 0);111 if (rc > 0)112 rc = 0;113out_fput:114 fdput(src_file);115out_drop_write:116 mnt_drop_write_file(dst_file);117 return rc;118}119 120static long smb_mnt_get_tcon_info(struct cifs_tcon *tcon, void __user *arg)121{122 int rc = 0;123 struct smb_mnt_tcon_info tcon_inf;124 125 tcon_inf.tid = tcon->tid;126 tcon_inf.session_id = tcon->ses->Suid;127 128 if (copy_to_user(arg, &tcon_inf, sizeof(struct smb_mnt_tcon_info)))129 rc = -EFAULT;130 131 return rc;132}133 134static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,135 void __user *arg)136{137 int rc = 0;138 struct smb_mnt_fs_info *fsinf;139 140 fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);141 if (fsinf == NULL)142 return -ENOMEM;143 144 fsinf->version = 1;145 fsinf->protocol_id = tcon->ses->server->vals->protocol_id;146 fsinf->tcon_flags = tcon->Flags;147 fsinf->device_characteristics =148 le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);149 fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);150 fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);151 fsinf->max_path_component =152 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);153 fsinf->vol_serial_number = tcon->vol_serial_number;154 fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);155 fsinf->share_flags = tcon->share_flags;156 fsinf->share_caps = le32_to_cpu(tcon->capabilities);157 fsinf->sector_flags = tcon->ss_flags;158 fsinf->optimal_sector_size = tcon->perf_sector_size;159 fsinf->max_bytes_chunk = tcon->max_bytes_chunk;160 fsinf->maximal_access = tcon->maximal_access;161 fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);162 163 if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))164 rc = -EFAULT;165 166 kfree(fsinf);167 return rc;168}169 170static int cifs_shutdown(struct super_block *sb, unsigned long arg)171{172 struct cifs_sb_info *sbi = CIFS_SB(sb);173 struct tcon_link *tlink;174 struct cifs_tcon *tcon;175 __u32 flags;176 int rc;177 178 if (!capable(CAP_SYS_ADMIN))179 return -EPERM;180 181 if (get_user(flags, (__u32 __user *)arg))182 return -EFAULT;183 184 tlink = cifs_sb_tlink(sbi);185 if (IS_ERR(tlink))186 return PTR_ERR(tlink);187 tcon = tlink_tcon(tlink);188 189 trace_smb3_shutdown_enter(flags, tcon->tid);190 if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH) {191 rc = -EINVAL;192 goto shutdown_out_err;193 }194 195 if (cifs_forced_shutdown(sbi))196 goto shutdown_good;197 198 cifs_dbg(VFS, "shut down requested (%d)", flags);199 200 /*201 * see:202 * https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html203 * for more information and description of original intent of the flags204 */205 switch (flags) {206 /*207 * We could add support later for default flag which requires:208 * "Flush all dirty data and metadata to disk"209 * would need to call syncfs or equivalent to flush page cache for210 * the mount and then issue fsync to server (if nostrictsync not set)211 */212 case CIFS_GOING_FLAGS_DEFAULT:213 cifs_dbg(FYI, "shutdown with default flag not supported\n");214 rc = -EINVAL;215 goto shutdown_out_err;216 /*217 * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not218 * data) but metadata writes are not cached on the client, so can treat219 * it similarly to NOLOGFLUSH220 */221 case CIFS_GOING_FLAGS_LOGFLUSH:222 case CIFS_GOING_FLAGS_NOLOGFLUSH:223 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN;224 goto shutdown_good;225 default:226 rc = -EINVAL;227 goto shutdown_out_err;228 }229 230shutdown_good:231 trace_smb3_shutdown_done(flags, tcon->tid);232 cifs_put_tlink(tlink);233 return 0;234shutdown_out_err:235 trace_smb3_shutdown_err(rc, flags, tcon->tid);236 cifs_put_tlink(tlink);237 return rc;238}239 240static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in)241{242 struct smb3_full_key_debug_info out;243 struct cifs_ses *ses;244 int rc = 0;245 bool found = false;246 u8 __user *end;247 248 if (!smb3_encryption_required(tcon)) {249 rc = -EOPNOTSUPP;250 goto out;251 }252 253 /* copy user input into our output buffer */254 if (copy_from_user(&out, in, sizeof(out))) {255 rc = -EINVAL;256 goto out;257 }258 259 if (!out.session_id) {260 /* if ses id is 0, use current user session */261 ses = tcon->ses;262 } else {263 /* otherwise if a session id is given, look for it in all our sessions */264 struct cifs_ses *ses_it = NULL;265 struct TCP_Server_Info *server_it = NULL;266 267 spin_lock(&cifs_tcp_ses_lock);268 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) {269 list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) {270 spin_lock(&ses_it->ses_lock);271 if (ses_it->ses_status != SES_EXITING &&272 ses_it->Suid == out.session_id) {273 ses = ses_it;274 /*275 * since we are using the session outside the crit276 * section, we need to make sure it won't be released277 * so increment its refcount278 */279 cifs_smb_ses_inc_refcount(ses);280 spin_unlock(&ses_it->ses_lock);281 found = true;282 goto search_end;283 }284 spin_unlock(&ses_it->ses_lock);285 }286 }287search_end:288 spin_unlock(&cifs_tcp_ses_lock);289 if (!found) {290 rc = -ENOENT;291 goto out;292 }293 }294 295 switch (ses->server->cipher_type) {296 case SMB2_ENCRYPTION_AES128_CCM:297 case SMB2_ENCRYPTION_AES128_GCM:298 out.session_key_length = CIFS_SESS_KEY_SIZE;299 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE;300 break;301 case SMB2_ENCRYPTION_AES256_CCM:302 case SMB2_ENCRYPTION_AES256_GCM:303 out.session_key_length = CIFS_SESS_KEY_SIZE;304 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE;305 break;306 default:307 rc = -EOPNOTSUPP;308 goto out;309 }310 311 /* check if user buffer is big enough to store all the keys */312 if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length313 + out.server_out_key_length) {314 rc = -ENOBUFS;315 goto out;316 }317 318 out.session_id = ses->Suid;319 out.cipher_type = le16_to_cpu(ses->server->cipher_type);320 321 /* overwrite user input with our output */322 if (copy_to_user(in, &out, sizeof(out))) {323 rc = -EINVAL;324 goto out;325 }326 327 /* append all the keys at the end of the user buffer */328 end = in->data;329 if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) {330 rc = -EINVAL;331 goto out;332 }333 end += out.session_key_length;334 335 if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) {336 rc = -EINVAL;337 goto out;338 }339 end += out.server_in_key_length;340 341 if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) {342 rc = -EINVAL;343 goto out;344 }345 346out:347 if (found)348 cifs_put_smb_ses(ses);349 return rc;350}351 352long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)353{354 struct inode *inode = file_inode(filep);355 struct smb3_key_debug_info pkey_inf;356 int rc = -ENOTTY; /* strange error - but the precedent */357 unsigned int xid;358 struct cifsFileInfo *pSMBFile = filep->private_data;359 struct cifs_tcon *tcon;360 struct tcon_link *tlink;361 struct cifs_sb_info *cifs_sb;362 __u64 ExtAttrBits = 0;363#ifdef CONFIG_CIFS_POSIX364#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY365 __u64 caps;366#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */367#endif /* CONFIG_CIFS_POSIX */368 369 xid = get_xid();370 371 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);372 if (pSMBFile == NULL)373 trace_smb3_ioctl(xid, 0, command);374 else375 trace_smb3_ioctl(xid, pSMBFile->fid.persistent_fid, command);376 377 switch (command) {378 case FS_IOC_GETFLAGS:379 if (pSMBFile == NULL)380 break;381 tcon = tlink_tcon(pSMBFile->tlink);382#ifdef CONFIG_CIFS_POSIX383#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY384 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);385 if (CIFS_UNIX_EXTATTR_CAP & caps) {386 __u64 ExtAttrMask = 0;387 rc = CIFSGetExtAttr(xid, tcon,388 pSMBFile->fid.netfid,389 &ExtAttrBits, &ExtAttrMask);390 if (rc == 0)391 rc = put_user(ExtAttrBits &392 FS_FL_USER_VISIBLE,393 (int __user *)arg);394 if (rc != -EOPNOTSUPP)395 break;396 }397#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */398#endif /* CONFIG_CIFS_POSIX */399 rc = 0;400 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {401 /* add in the compressed bit */402 ExtAttrBits = FS_COMPR_FL;403 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,404 (int __user *)arg);405 }406 break;407 case FS_IOC_SETFLAGS:408 if (pSMBFile == NULL)409 break;410 tcon = tlink_tcon(pSMBFile->tlink);411 /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */412 413 if (get_user(ExtAttrBits, (int __user *)arg)) {414 rc = -EFAULT;415 break;416 }417 418 /*419 * if (CIFS_UNIX_EXTATTR_CAP & caps)420 * rc = CIFSSetExtAttr(xid, tcon,421 * pSMBFile->fid.netfid,422 * extAttrBits,423 * &ExtAttrMask);424 * if (rc != -EOPNOTSUPP)425 * break;426 */427 428 /* Currently only flag we can set is compressed flag */429 if ((ExtAttrBits & FS_COMPR_FL) == 0)430 break;431 432 /* Try to set compress flag */433 if (tcon->ses->server->ops->set_compression) {434 rc = tcon->ses->server->ops->set_compression(435 xid, tcon, pSMBFile);436 cifs_dbg(FYI, "set compress flag rc %d\n", rc);437 }438 break;439 case CIFS_IOC_COPYCHUNK_FILE:440 rc = cifs_ioctl_copychunk(xid, filep, arg);441 break;442 case CIFS_QUERY_INFO:443 rc = cifs_ioctl_query_info(xid, filep, arg);444 break;445 case CIFS_IOC_SET_INTEGRITY:446 if (pSMBFile == NULL)447 break;448 tcon = tlink_tcon(pSMBFile->tlink);449 if (tcon->ses->server->ops->set_integrity)450 rc = tcon->ses->server->ops->set_integrity(xid,451 tcon, pSMBFile);452 else453 rc = -EOPNOTSUPP;454 break;455 case CIFS_IOC_GET_MNT_INFO:456 if (pSMBFile == NULL)457 break;458 tcon = tlink_tcon(pSMBFile->tlink);459 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);460 break;461 case CIFS_IOC_GET_TCON_INFO:462 cifs_sb = CIFS_SB(inode->i_sb);463 tlink = cifs_sb_tlink(cifs_sb);464 if (IS_ERR(tlink)) {465 rc = PTR_ERR(tlink);466 break;467 }468 tcon = tlink_tcon(tlink);469 rc = smb_mnt_get_tcon_info(tcon, (void __user *)arg);470 cifs_put_tlink(tlink);471 break;472 case CIFS_ENUMERATE_SNAPSHOTS:473 if (pSMBFile == NULL)474 break;475 if (arg == 0) {476 rc = -EINVAL;477 goto cifs_ioc_exit;478 }479 tcon = tlink_tcon(pSMBFile->tlink);480 if (tcon->ses->server->ops->enum_snapshots)481 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,482 pSMBFile, (void __user *)arg);483 else484 rc = -EOPNOTSUPP;485 break;486 case CIFS_DUMP_KEY:487 /*488 * Dump encryption keys. This is an old ioctl that only489 * handles AES-128-{CCM,GCM}.490 */491 if (!capable(CAP_SYS_ADMIN)) {492 rc = -EACCES;493 break;494 }495 496 cifs_sb = CIFS_SB(inode->i_sb);497 tlink = cifs_sb_tlink(cifs_sb);498 if (IS_ERR(tlink)) {499 rc = PTR_ERR(tlink);500 break;501 }502 tcon = tlink_tcon(tlink);503 if (!smb3_encryption_required(tcon)) {504 rc = -EOPNOTSUPP;505 cifs_put_tlink(tlink);506 break;507 }508 pkey_inf.cipher_type =509 le16_to_cpu(tcon->ses->server->cipher_type);510 pkey_inf.Suid = tcon->ses->Suid;511 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,512 16 /* SMB2_NTLMV2_SESSKEY_SIZE */);513 memcpy(pkey_inf.smb3decryptionkey,514 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);515 memcpy(pkey_inf.smb3encryptionkey,516 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);517 if (copy_to_user((void __user *)arg, &pkey_inf,518 sizeof(struct smb3_key_debug_info)))519 rc = -EFAULT;520 else521 rc = 0;522 cifs_put_tlink(tlink);523 break;524 case CIFS_DUMP_FULL_KEY:525 /*526 * Dump encryption keys (handles any key sizes)527 */528 if (pSMBFile == NULL)529 break;530 if (!capable(CAP_SYS_ADMIN)) {531 rc = -EACCES;532 break;533 }534 cifs_sb = CIFS_SB(inode->i_sb);535 tlink = cifs_sb_tlink(cifs_sb);536 if (IS_ERR(tlink)) {537 rc = PTR_ERR(tlink);538 break;539 }540 541 tcon = tlink_tcon(tlink);542 rc = cifs_dump_full_key(tcon, (void __user *)arg);543 cifs_put_tlink(tlink);544 break;545 case CIFS_IOC_NOTIFY:546 if (!S_ISDIR(inode->i_mode)) {547 /* Notify can only be done on directories */548 rc = -EOPNOTSUPP;549 break;550 }551 cifs_sb = CIFS_SB(inode->i_sb);552 tlink = cifs_sb_tlink(cifs_sb);553 if (IS_ERR(tlink)) {554 rc = PTR_ERR(tlink);555 break;556 }557 tcon = tlink_tcon(tlink);558 if (tcon && tcon->ses->server->ops->notify) {559 rc = tcon->ses->server->ops->notify(xid,560 filep, (void __user *)arg,561 false /* no ret data */);562 cifs_dbg(FYI, "ioctl notify rc %d\n", rc);563 } else564 rc = -EOPNOTSUPP;565 cifs_put_tlink(tlink);566 break;567 case CIFS_IOC_NOTIFY_INFO:568 if (!S_ISDIR(inode->i_mode)) {569 /* Notify can only be done on directories */570 rc = -EOPNOTSUPP;571 break;572 }573 cifs_sb = CIFS_SB(inode->i_sb);574 tlink = cifs_sb_tlink(cifs_sb);575 if (IS_ERR(tlink)) {576 rc = PTR_ERR(tlink);577 break;578 }579 tcon = tlink_tcon(tlink);580 if (tcon && tcon->ses->server->ops->notify) {581 rc = tcon->ses->server->ops->notify(xid,582 filep, (void __user *)arg,583 true /* return details */);584 cifs_dbg(FYI, "ioctl notify info rc %d\n", rc);585 } else586 rc = -EOPNOTSUPP;587 cifs_put_tlink(tlink);588 break;589 case CIFS_IOC_SHUTDOWN:590 rc = cifs_shutdown(inode->i_sb, arg);591 break;592 default:593 cifs_dbg(FYI, "unsupported ioctl\n");594 break;595 }596cifs_ioc_exit:597 free_xid(xid);598 return rc;599}600