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-rw-r--r--fs/smb/client/smb2file.c372
1 files changed, 372 insertions, 0 deletions
diff --git a/fs/smb/client/smb2file.c b/fs/smb/client/smb2file.c
new file mode 100644
index 0000000000..e0ee96d69d
--- /dev/null
+++ b/fs/smb/client/smb2file.c
@@ -0,0 +1,372 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ *
+ * Copyright (C) International Business Machines Corp., 2002, 2011
+ * Author(s): Steve French (sfrench@us.ibm.com),
+ * Pavel Shilovsky ((pshilovsky@samba.org) 2012
+ *
+ */
+#include <linux/fs.h>
+#include <linux/filelock.h>
+#include <linux/stat.h>
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+#include <asm/div64.h>
+#include "cifsfs.h"
+#include "cifspdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+#include "cifs_fs_sb.h"
+#include "cifs_unicode.h"
+#include "fscache.h"
+#include "smb2proto.h"
+#include "smb2status.h"
+
+static struct smb2_symlink_err_rsp *symlink_data(const struct kvec *iov)
+{
+ struct smb2_err_rsp *err = iov->iov_base;
+ struct smb2_symlink_err_rsp *sym = ERR_PTR(-EINVAL);
+ u32 len;
+
+ if (err->ErrorContextCount) {
+ struct smb2_error_context_rsp *p, *end;
+
+ len = (u32)err->ErrorContextCount * (offsetof(struct smb2_error_context_rsp,
+ ErrorContextData) +
+ sizeof(struct smb2_symlink_err_rsp));
+ if (le32_to_cpu(err->ByteCount) < len || iov->iov_len < len + sizeof(*err) + 1)
+ return ERR_PTR(-EINVAL);
+
+ p = (struct smb2_error_context_rsp *)err->ErrorData;
+ end = (struct smb2_error_context_rsp *)((u8 *)err + iov->iov_len);
+ do {
+ if (le32_to_cpu(p->ErrorId) == SMB2_ERROR_ID_DEFAULT) {
+ sym = (struct smb2_symlink_err_rsp *)&p->ErrorContextData;
+ break;
+ }
+ cifs_dbg(FYI, "%s: skipping unhandled error context: 0x%x\n",
+ __func__, le32_to_cpu(p->ErrorId));
+
+ len = ALIGN(le32_to_cpu(p->ErrorDataLength), 8);
+ p = (struct smb2_error_context_rsp *)((u8 *)&p->ErrorContextData + len);
+ } while (p < end);
+ } else if (le32_to_cpu(err->ByteCount) >= sizeof(*sym) &&
+ iov->iov_len >= SMB2_SYMLINK_STRUCT_SIZE) {
+ sym = (struct smb2_symlink_err_rsp *)err->ErrorData;
+ }
+
+ if (!IS_ERR(sym) && (le32_to_cpu(sym->SymLinkErrorTag) != SYMLINK_ERROR_TAG ||
+ le32_to_cpu(sym->ReparseTag) != IO_REPARSE_TAG_SYMLINK))
+ sym = ERR_PTR(-EINVAL);
+
+ return sym;
+}
+
+int smb2_parse_symlink_response(struct cifs_sb_info *cifs_sb, const struct kvec *iov, char **path)
+{
+ struct smb2_symlink_err_rsp *sym;
+ unsigned int sub_offs, sub_len;
+ unsigned int print_offs, print_len;
+ char *s;
+
+ if (!cifs_sb || !iov || !iov->iov_base || !iov->iov_len || !path)
+ return -EINVAL;
+
+ sym = symlink_data(iov);
+ if (IS_ERR(sym))
+ return PTR_ERR(sym);
+
+ sub_len = le16_to_cpu(sym->SubstituteNameLength);
+ sub_offs = le16_to_cpu(sym->SubstituteNameOffset);
+ print_len = le16_to_cpu(sym->PrintNameLength);
+ print_offs = le16_to_cpu(sym->PrintNameOffset);
+
+ if (iov->iov_len < SMB2_SYMLINK_STRUCT_SIZE + sub_offs + sub_len ||
+ iov->iov_len < SMB2_SYMLINK_STRUCT_SIZE + print_offs + print_len)
+ return -EINVAL;
+
+ s = cifs_strndup_from_utf16((char *)sym->PathBuffer + sub_offs, sub_len, true,
+ cifs_sb->local_nls);
+ if (!s)
+ return -ENOMEM;
+ convert_delimiter(s, '/');
+ cifs_dbg(FYI, "%s: symlink target: %s\n", __func__, s);
+
+ *path = s;
+ return 0;
+}
+
+int smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, void *buf)
+{
+ int rc;
+ __le16 *smb2_path;
+ __u8 smb2_oplock;
+ struct cifs_open_info_data *data = buf;
+ struct smb2_file_all_info file_info = {};
+ struct smb2_file_all_info *smb2_data = data ? &file_info : NULL;
+ struct kvec err_iov = {};
+ int err_buftype = CIFS_NO_BUFFER;
+ struct cifs_fid *fid = oparms->fid;
+ struct network_resiliency_req nr_ioctl_req;
+
+ smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
+ if (smb2_path == NULL)
+ return -ENOMEM;
+
+ oparms->desired_access |= FILE_READ_ATTRIBUTES;
+ smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
+
+ rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data, NULL, &err_iov,
+ &err_buftype);
+ if (rc && data) {
+ struct smb2_hdr *hdr = err_iov.iov_base;
+
+ if (unlikely(!err_iov.iov_base || err_buftype == CIFS_NO_BUFFER))
+ goto out;
+ if (hdr->Status == STATUS_STOPPED_ON_SYMLINK) {
+ rc = smb2_parse_symlink_response(oparms->cifs_sb, &err_iov,
+ &data->symlink_target);
+ if (!rc) {
+ memset(smb2_data, 0, sizeof(*smb2_data));
+ oparms->create_options |= OPEN_REPARSE_POINT;
+ rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data,
+ NULL, NULL, NULL);
+ oparms->create_options &= ~OPEN_REPARSE_POINT;
+ }
+ }
+ }
+
+ if (rc)
+ goto out;
+
+ if (oparms->tcon->use_resilient) {
+ /* default timeout is 0, servers pick default (120 seconds) */
+ nr_ioctl_req.Timeout =
+ cpu_to_le32(oparms->tcon->handle_timeout);
+ nr_ioctl_req.Reserved = 0;
+ rc = SMB2_ioctl(xid, oparms->tcon, fid->persistent_fid,
+ fid->volatile_fid, FSCTL_LMR_REQUEST_RESILIENCY,
+ (char *)&nr_ioctl_req, sizeof(nr_ioctl_req),
+ CIFSMaxBufSize, NULL, NULL /* no return info */);
+ if (rc == -EOPNOTSUPP) {
+ cifs_dbg(VFS,
+ "resiliency not supported by server, disabling\n");
+ oparms->tcon->use_resilient = false;
+ } else if (rc)
+ cifs_dbg(FYI, "error %d setting resiliency\n", rc);
+
+ rc = 0;
+ }
+
+ if (smb2_data) {
+ /* if open response does not have IndexNumber field - get it */
+ if (smb2_data->IndexNumber == 0) {
+ rc = SMB2_get_srv_num(xid, oparms->tcon,
+ fid->persistent_fid,
+ fid->volatile_fid,
+ &smb2_data->IndexNumber);
+ if (rc) {
+ /*
+ * let get_inode_info disable server inode
+ * numbers
+ */
+ smb2_data->IndexNumber = 0;
+ rc = 0;
+ }
+ }
+ memcpy(&data->fi, smb2_data, sizeof(data->fi));
+ }
+
+ *oplock = smb2_oplock;
+out:
+ free_rsp_buf(err_buftype, err_iov.iov_base);
+ kfree(smb2_path);
+ return rc;
+}
+
+int
+smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
+ const unsigned int xid)
+{
+ int rc = 0, stored_rc;
+ unsigned int max_num, num = 0, max_buf;
+ struct smb2_lock_element *buf, *cur;
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
+ struct cifsLockInfo *li, *tmp;
+ __u64 length = 1 + flock->fl_end - flock->fl_start;
+ struct list_head tmp_llist;
+
+ INIT_LIST_HEAD(&tmp_llist);
+
+ /*
+ * Accessing maxBuf is racy with cifs_reconnect - need to store value
+ * and check it before using.
+ */
+ max_buf = tcon->ses->server->maxBuf;
+ if (max_buf < sizeof(struct smb2_lock_element))
+ return -EINVAL;
+
+ BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
+ max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
+ max_num = max_buf / sizeof(struct smb2_lock_element);
+ buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ cur = buf;
+
+ cifs_down_write(&cinode->lock_sem);
+ list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
+ if (flock->fl_start > li->offset ||
+ (flock->fl_start + length) <
+ (li->offset + li->length))
+ continue;
+ if (current->tgid != li->pid)
+ /*
+ * flock and OFD lock are associated with an open
+ * file description, not the process.
+ */
+ if (!(flock->fl_flags & (FL_FLOCK | FL_OFDLCK)))
+ continue;
+ if (cinode->can_cache_brlcks) {
+ /*
+ * We can cache brlock requests - simply remove a lock
+ * from the file's list.
+ */
+ list_del(&li->llist);
+ cifs_del_lock_waiters(li);
+ kfree(li);
+ continue;
+ }
+ cur->Length = cpu_to_le64(li->length);
+ cur->Offset = cpu_to_le64(li->offset);
+ cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
+ /*
+ * We need to save a lock here to let us add it again to the
+ * file's list if the unlock range request fails on the server.
+ */
+ list_move(&li->llist, &tmp_llist);
+ if (++num == max_num) {
+ stored_rc = smb2_lockv(xid, tcon,
+ cfile->fid.persistent_fid,
+ cfile->fid.volatile_fid,
+ current->tgid, num, buf);
+ if (stored_rc) {
+ /*
+ * We failed on the unlock range request - add
+ * all locks from the tmp list to the head of
+ * the file's list.
+ */
+ cifs_move_llist(&tmp_llist,
+ &cfile->llist->locks);
+ rc = stored_rc;
+ } else
+ /*
+ * The unlock range request succeed - free the
+ * tmp list.
+ */
+ cifs_free_llist(&tmp_llist);
+ cur = buf;
+ num = 0;
+ } else
+ cur++;
+ }
+ if (num) {
+ stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
+ cfile->fid.volatile_fid, current->tgid,
+ num, buf);
+ if (stored_rc) {
+ cifs_move_llist(&tmp_llist, &cfile->llist->locks);
+ rc = stored_rc;
+ } else
+ cifs_free_llist(&tmp_llist);
+ }
+ up_write(&cinode->lock_sem);
+
+ kfree(buf);
+ return rc;
+}
+
+static int
+smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
+ struct smb2_lock_element *buf, unsigned int max_num)
+{
+ int rc = 0, stored_rc;
+ struct cifsFileInfo *cfile = fdlocks->cfile;
+ struct cifsLockInfo *li;
+ unsigned int num = 0;
+ struct smb2_lock_element *cur = buf;
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+
+ list_for_each_entry(li, &fdlocks->locks, llist) {
+ cur->Length = cpu_to_le64(li->length);
+ cur->Offset = cpu_to_le64(li->offset);
+ cur->Flags = cpu_to_le32(li->type |
+ SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
+ if (++num == max_num) {
+ stored_rc = smb2_lockv(xid, tcon,
+ cfile->fid.persistent_fid,
+ cfile->fid.volatile_fid,
+ current->tgid, num, buf);
+ if (stored_rc)
+ rc = stored_rc;
+ cur = buf;
+ num = 0;
+ } else
+ cur++;
+ }
+ if (num) {
+ stored_rc = smb2_lockv(xid, tcon,
+ cfile->fid.persistent_fid,
+ cfile->fid.volatile_fid,
+ current->tgid, num, buf);
+ if (stored_rc)
+ rc = stored_rc;
+ }
+
+ return rc;
+}
+
+int
+smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
+{
+ int rc = 0, stored_rc;
+ unsigned int xid;
+ unsigned int max_num, max_buf;
+ struct smb2_lock_element *buf;
+ struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
+ struct cifs_fid_locks *fdlocks;
+
+ xid = get_xid();
+
+ /*
+ * Accessing maxBuf is racy with cifs_reconnect - need to store value
+ * and check it for zero before using.
+ */
+ max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
+ if (max_buf < sizeof(struct smb2_lock_element)) {
+ free_xid(xid);
+ return -EINVAL;
+ }
+
+ BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
+ max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
+ max_num = max_buf / sizeof(struct smb2_lock_element);
+ buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
+ if (!buf) {
+ free_xid(xid);
+ return -ENOMEM;
+ }
+
+ list_for_each_entry(fdlocks, &cinode->llist, llist) {
+ stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
+ if (stored_rc)
+ rc = stored_rc;
+ }
+
+ kfree(buf);
+ free_xid(xid);
+ return rc;
+}