CIFS: Add SMB2 support for is_path_accessible
that needs for a successful mount through SMB2 protocol. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Pavel Shilovsky
Pavel Shilovsky
parent
68889f269b
commit
2503a0dba9
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@ -330,3 +330,64 @@ cifsConvertToUTF16(__le16 *target, const char *source, int srclen,
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ctoUTF16_out:
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return i;
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}
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#ifdef CONFIG_CIFS_SMB2
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/*
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* cifs_local_to_utf16_bytes - how long will a string be after conversion?
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* @from - pointer to input string
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* @maxbytes - don't go past this many bytes of input string
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* @codepage - source codepage
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*
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* Walk a string and return the number of bytes that the string will
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* be after being converted to the given charset, not including any null
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* termination required. Don't walk past maxbytes in the source buffer.
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*/
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static int
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cifs_local_to_utf16_bytes(const char *from, int len,
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const struct nls_table *codepage)
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{
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int charlen;
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int i;
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wchar_t wchar_to;
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for (i = 0; len && *from; i++, from += charlen, len -= charlen) {
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charlen = codepage->char2uni(from, len, &wchar_to);
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/* Failed conversion defaults to a question mark */
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if (charlen < 1)
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charlen = 1;
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}
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return 2 * i; /* UTF16 characters are two bytes */
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}
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/*
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* cifs_strndup_to_utf16 - copy a string to wire format from the local codepage
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* @src - source string
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* @maxlen - don't walk past this many bytes in the source string
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* @utf16_len - the length of the allocated string in bytes (including null)
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* @cp - source codepage
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* @remap - map special chars
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*
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* Take a string convert it from the local codepage to UTF16 and
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* put it in a new buffer. Returns a pointer to the new string or NULL on
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* error.
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*/
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__le16 *
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cifs_strndup_to_utf16(const char *src, const int maxlen, int *utf16_len,
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const struct nls_table *cp, int remap)
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{
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int len;
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__le16 *dst;
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len = cifs_local_to_utf16_bytes(src, maxlen, cp);
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len += 2; /* NULL */
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dst = kmalloc(len, GFP_KERNEL);
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if (!dst) {
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*utf16_len = 0;
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return NULL;
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}
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cifsConvertToUTF16(dst, src, strlen(src), cp, remap);
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*utf16_len = len;
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return dst;
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}
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#endif /* CONFIG_CIFS_SMB2 */
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@ -84,6 +84,11 @@ char *cifs_strndup_from_utf16(const char *src, const int maxlen,
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const struct nls_table *codepage);
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extern int cifsConvertToUTF16(__le16 *target, const char *source, int maxlen,
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const struct nls_table *cp, int mapChars);
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#ifdef CONFIG_CIFS_SMB2
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extern __le16 *cifs_strndup_to_utf16(const char *src, const int maxlen,
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int *utf16_len, const struct nls_table *cp,
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int remap);
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#endif /* CONFIG_CIFS_SMB2 */
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#endif
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/*
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@ -230,6 +230,11 @@ smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
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((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferLength);
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break;
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case SMB2_CREATE:
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*off = le32_to_cpu(
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((struct smb2_create_rsp *)hdr)->CreateContextsOffset);
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*len = le32_to_cpu(
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((struct smb2_create_rsp *)hdr)->CreateContextsLength);
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break;
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case SMB2_READ:
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case SMB2_QUERY_INFO:
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case SMB2_QUERY_DIRECTORY:
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@ -315,3 +320,23 @@ calc_size_exit:
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cFYI(1, "SMB2 len %d", len);
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return len;
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}
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/* Note: caller must free return buffer */
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__le16 *
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cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
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{
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int len;
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const char *start_of_path;
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__le16 *to;
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/* Windows doesn't allow paths beginning with \ */
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if (from[0] == '\\')
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start_of_path = from + 1;
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else
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start_of_path = from;
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to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
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cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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return to;
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}
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@ -157,6 +157,30 @@ smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
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return rc;
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}
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static int
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smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
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struct cifs_sb_info *cifs_sb, const char *full_path)
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{
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int rc;
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__u64 persistent_fid, volatile_fid;
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__le16 *utf16_path;
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utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
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if (!utf16_path)
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return -ENOMEM;
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rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
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FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0);
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if (rc) {
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kfree(utf16_path);
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return rc;
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}
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rc = SMB2_close(xid, tcon, persistent_fid, volatile_fid);
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kfree(utf16_path);
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return rc;
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}
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struct smb_version_operations smb21_operations = {
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.setup_request = smb2_setup_request,
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.check_receive = smb2_check_receive,
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@ -174,6 +198,7 @@ struct smb_version_operations smb21_operations = {
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.logoff = SMB2_logoff,
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.tree_connect = SMB2_tcon,
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.tree_disconnect = SMB2_tdis,
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.is_path_accessible = smb2_is_path_accessible,
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};
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struct smb_version_values smb21_values = {
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@ -829,3 +829,135 @@ SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
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return rc;
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}
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int
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SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
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u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
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__u32 create_disposition, __u32 file_attributes, __u32 create_options)
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{
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struct smb2_create_req *req;
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struct smb2_create_rsp *rsp;
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struct TCP_Server_Info *server;
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struct cifs_ses *ses = tcon->ses;
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struct kvec iov[2];
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int resp_buftype;
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int uni_path_len;
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int rc = 0;
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int num_iovecs = 2;
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cFYI(1, "create/open");
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if (ses && (ses->server))
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server = ses->server;
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else
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return -EIO;
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rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
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if (rc)
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return rc;
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if (enable_oplocks)
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req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_BATCH;
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else
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req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
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req->ImpersonationLevel = IL_IMPERSONATION;
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req->DesiredAccess = cpu_to_le32(desired_access);
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/* File attributes ignored on open (used in create though) */
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req->FileAttributes = cpu_to_le32(file_attributes);
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req->ShareAccess = FILE_SHARE_ALL_LE;
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req->CreateDisposition = cpu_to_le32(create_disposition);
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req->CreateOptions = cpu_to_le32(create_options);
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uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
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req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
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- 1 /* pad */ - 4 /* do not count rfc1001 len field */);
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iov[0].iov_base = (char *)req;
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/* 4 for rfc1002 length field */
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iov[0].iov_len = get_rfc1002_length(req) + 4;
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/* MUST set path len (NameLength) to 0 opening root of share */
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if (uni_path_len >= 4) {
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req->NameLength = cpu_to_le16(uni_path_len - 2);
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/* -1 since last byte is buf[0] which is sent below (path) */
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iov[0].iov_len--;
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iov[1].iov_len = uni_path_len;
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iov[1].iov_base = path;
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/*
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* -1 since last byte is buf[0] which was counted in
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* smb2_buf_len.
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*/
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inc_rfc1001_len(req, uni_path_len - 1);
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} else {
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num_iovecs = 1;
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req->NameLength = 0;
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}
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rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
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rsp = (struct smb2_create_rsp *)iov[0].iov_base;
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if (rc != 0) {
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cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
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goto creat_exit;
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}
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if (rsp == NULL) {
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rc = -EIO;
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goto creat_exit;
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}
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*persistent_fid = rsp->PersistentFileId;
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*volatile_fid = rsp->VolatileFileId;
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creat_exit:
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free_rsp_buf(resp_buftype, rsp);
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return rc;
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}
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int
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SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
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u64 persistent_fid, u64 volatile_fid)
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{
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struct smb2_close_req *req;
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struct smb2_close_rsp *rsp;
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struct TCP_Server_Info *server;
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struct cifs_ses *ses = tcon->ses;
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struct kvec iov[1];
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int resp_buftype;
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int rc = 0;
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cFYI(1, "Close");
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if (ses && (ses->server))
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server = ses->server;
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else
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return -EIO;
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rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
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if (rc)
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return rc;
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req->PersistentFileId = persistent_fid;
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req->VolatileFileId = volatile_fid;
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iov[0].iov_base = (char *)req;
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/* 4 for rfc1002 length field */
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iov[0].iov_len = get_rfc1002_length(req) + 4;
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rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
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rsp = (struct smb2_close_rsp *)iov[0].iov_base;
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if (rc != 0) {
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if (tcon)
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cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
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goto close_exit;
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}
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if (rsp == NULL) {
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rc = -EIO;
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goto close_exit;
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}
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/* BB FIXME - decode close response, update inode for caching */
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close_exit:
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free_rsp_buf(resp_buftype, rsp);
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return rc;
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}
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@ -281,4 +281,171 @@ struct smb2_tree_disconnect_rsp {
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__le16 Reserved;
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} __packed;
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/* File Attrubutes */
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#define FILE_ATTRIBUTE_READONLY 0x00000001
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#define FILE_ATTRIBUTE_HIDDEN 0x00000002
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#define FILE_ATTRIBUTE_SYSTEM 0x00000004
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#define FILE_ATTRIBUTE_DIRECTORY 0x00000010
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#define FILE_ATTRIBUTE_ARCHIVE 0x00000020
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#define FILE_ATTRIBUTE_NORMAL 0x00000080
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#define FILE_ATTRIBUTE_TEMPORARY 0x00000100
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#define FILE_ATTRIBUTE_SPARSE_FILE 0x00000200
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#define FILE_ATTRIBUTE_REPARSE_POINT 0x00000400
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#define FILE_ATTRIBUTE_COMPRESSED 0x00000800
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#define FILE_ATTRIBUTE_OFFLINE 0x00001000
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#define FILE_ATTRIBUTE_NOT_CONTENT_INDEXED 0x00002000
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#define FILE_ATTRIBUTE_ENCRYPTED 0x00004000
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/* Oplock levels */
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#define SMB2_OPLOCK_LEVEL_NONE 0x00
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#define SMB2_OPLOCK_LEVEL_II 0x01
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#define SMB2_OPLOCK_LEVEL_EXCLUSIVE 0x08
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#define SMB2_OPLOCK_LEVEL_BATCH 0x09
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#define SMB2_OPLOCK_LEVEL_LEASE 0xFF
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/* Desired Access Flags */
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#define FILE_READ_DATA_LE cpu_to_le32(0x00000001)
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#define FILE_WRITE_DATA_LE cpu_to_le32(0x00000002)
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#define FILE_APPEND_DATA_LE cpu_to_le32(0x00000004)
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#define FILE_READ_EA_LE cpu_to_le32(0x00000008)
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#define FILE_WRITE_EA_LE cpu_to_le32(0x00000010)
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#define FILE_EXECUTE_LE cpu_to_le32(0x00000020)
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#define FILE_READ_ATTRIBUTES_LE cpu_to_le32(0x00000080)
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#define FILE_WRITE_ATTRIBUTES_LE cpu_to_le32(0x00000100)
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#define FILE_DELETE_LE cpu_to_le32(0x00010000)
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#define FILE_READ_CONTROL_LE cpu_to_le32(0x00020000)
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#define FILE_WRITE_DAC_LE cpu_to_le32(0x00040000)
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#define FILE_WRITE_OWNER_LE cpu_to_le32(0x00080000)
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#define FILE_SYNCHRONIZE_LE cpu_to_le32(0x00100000)
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#define FILE_ACCESS_SYSTEM_SECURITY_LE cpu_to_le32(0x01000000)
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#define FILE_MAXIMAL_ACCESS_LE cpu_to_le32(0x02000000)
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#define FILE_GENERIC_ALL_LE cpu_to_le32(0x10000000)
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#define FILE_GENERIC_EXECUTE_LE cpu_to_le32(0x20000000)
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#define FILE_GENERIC_WRITE_LE cpu_to_le32(0x40000000)
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#define FILE_GENERIC_READ_LE cpu_to_le32(0x80000000)
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/* ShareAccess Flags */
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#define FILE_SHARE_READ_LE cpu_to_le32(0x00000001)
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#define FILE_SHARE_WRITE_LE cpu_to_le32(0x00000002)
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#define FILE_SHARE_DELETE_LE cpu_to_le32(0x00000004)
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#define FILE_SHARE_ALL_LE cpu_to_le32(0x00000007)
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/* CreateDisposition Flags */
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#define FILE_SUPERSEDE_LE cpu_to_le32(0x00000000)
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#define FILE_OPEN_LE cpu_to_le32(0x00000001)
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#define FILE_CREATE_LE cpu_to_le32(0x00000002)
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#define FILE_OPEN_IF_LE cpu_to_le32(0x00000003)
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#define FILE_OVERWRITE_LE cpu_to_le32(0x00000004)
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#define FILE_OVERWRITE_IF_LE cpu_to_le32(0x00000005)
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/* CreateOptions Flags */
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#define FILE_DIRECTORY_FILE_LE cpu_to_le32(0x00000001)
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/* same as #define CREATE_NOT_FILE_LE cpu_to_le32(0x00000001) */
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#define FILE_WRITE_THROUGH_LE cpu_to_le32(0x00000002)
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#define FILE_SEQUENTIAL_ONLY_LE cpu_to_le32(0x00000004)
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#define FILE_NO_INTERMEDIATE_BUFFERRING_LE cpu_to_le32(0x00000008)
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#define FILE_SYNCHRONOUS_IO_ALERT_LE cpu_to_le32(0x00000010)
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#define FILE_SYNCHRONOUS_IO_NON_ALERT_LE cpu_to_le32(0x00000020)
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#define FILE_NON_DIRECTORY_FILE_LE cpu_to_le32(0x00000040)
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#define FILE_COMPLETE_IF_OPLOCKED_LE cpu_to_le32(0x00000100)
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#define FILE_NO_EA_KNOWLEDGE_LE cpu_to_le32(0x00000200)
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#define FILE_RANDOM_ACCESS_LE cpu_to_le32(0x00000800)
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#define FILE_DELETE_ON_CLOSE_LE cpu_to_le32(0x00001000)
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#define FILE_OPEN_BY_FILE_ID_LE cpu_to_le32(0x00002000)
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#define FILE_OPEN_FOR_BACKUP_INTENT_LE cpu_to_le32(0x00004000)
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#define FILE_NO_COMPRESSION_LE cpu_to_le32(0x00008000)
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#define FILE_RESERVE_OPFILTER_LE cpu_to_le32(0x00100000)
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#define FILE_OPEN_REPARSE_POINT_LE cpu_to_le32(0x00200000)
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#define FILE_OPEN_NO_RECALL_LE cpu_to_le32(0x00400000)
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#define FILE_OPEN_FOR_FREE_SPACE_QUERY_LE cpu_to_le32(0x00800000)
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#define FILE_READ_RIGHTS_LE (FILE_READ_DATA_LE | FILE_READ_EA_LE \
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| FILE_READ_ATTRIBUTES_LE)
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#define FILE_WRITE_RIGHTS_LE (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE \
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| FILE_WRITE_EA_LE | FILE_WRITE_ATTRIBUTES_LE)
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#define FILE_EXEC_RIGHTS_LE (FILE_EXECUTE_LE)
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/* Impersonation Levels */
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#define IL_ANONYMOUS cpu_to_le32(0x00000000)
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#define IL_IDENTIFICATION cpu_to_le32(0x00000001)
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#define IL_IMPERSONATION cpu_to_le32(0x00000002)
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#define IL_DELEGATE cpu_to_le32(0x00000003)
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/* Create Context Values */
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#define SMB2_CREATE_EA_BUFFER "ExtA" /* extended attributes */
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#define SMB2_CREATE_SD_BUFFER "SecD" /* security descriptor */
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#define SMB2_CREATE_DURABLE_HANDLE_REQUEST "DHnQ"
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#define SMB2_CREATE_DURABLE_HANDLE_RECONNECT "DHnC"
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#define SMB2_CREATE_ALLOCATION_SIZE "AlSi"
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#define SMB2_CREATE_QUERY_MAXIMAL_ACCESS_REQUEST "MxAc"
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#define SMB2_CREATE_TIMEWARP_REQUEST "TWrp"
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#define SMB2_CREATE_QUERY_ON_DISK_ID "QFid"
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#define SMB2_CREATE_REQUEST_LEASE "RqLs"
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struct smb2_create_req {
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struct smb2_hdr hdr;
|
||||
__le16 StructureSize; /* Must be 57 */
|
||||
__u8 SecurityFlags;
|
||||
__u8 RequestedOplockLevel;
|
||||
__le32 ImpersonationLevel;
|
||||
__le64 SmbCreateFlags;
|
||||
__le64 Reserved;
|
||||
__le32 DesiredAccess;
|
||||
__le32 FileAttributes;
|
||||
__le32 ShareAccess;
|
||||
__le32 CreateDisposition;
|
||||
__le32 CreateOptions;
|
||||
__le16 NameOffset;
|
||||
__le16 NameLength;
|
||||
__le32 CreateContextsOffset;
|
||||
__le32 CreateContextsLength;
|
||||
__u8 Buffer[1];
|
||||
} __packed;
|
||||
|
||||
struct smb2_create_rsp {
|
||||
struct smb2_hdr hdr;
|
||||
__le16 StructureSize; /* Must be 89 */
|
||||
__u8 OplockLevel;
|
||||
__u8 Reserved;
|
||||
__le32 CreateAction;
|
||||
__le64 CreationTime;
|
||||
__le64 LastAccessTime;
|
||||
__le64 LastWriteTime;
|
||||
__le64 ChangeTime;
|
||||
__le64 AllocationSize;
|
||||
__le64 EndofFile;
|
||||
__le32 FileAttributes;
|
||||
__le32 Reserved2;
|
||||
__u64 PersistentFileId; /* opaque endianness */
|
||||
__u64 VolatileFileId; /* opaque endianness */
|
||||
__le32 CreateContextsOffset;
|
||||
__le32 CreateContextsLength;
|
||||
__u8 Buffer[1];
|
||||
} __packed;
|
||||
|
||||
/* Currently defined values for close flags */
|
||||
#define SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB cpu_to_le16(0x0001)
|
||||
struct smb2_close_req {
|
||||
struct smb2_hdr hdr;
|
||||
__le16 StructureSize; /* Must be 24 */
|
||||
__le16 Flags;
|
||||
__le32 Reserved;
|
||||
__u64 PersistentFileId; /* opaque endianness */
|
||||
__u64 VolatileFileId; /* opaque endianness */
|
||||
} __packed;
|
||||
|
||||
struct smb2_close_rsp {
|
||||
struct smb2_hdr hdr;
|
||||
__le16 StructureSize; /* 60 */
|
||||
__le16 Flags;
|
||||
__le32 Reserved;
|
||||
__le64 CreationTime;
|
||||
__le64 LastAccessTime;
|
||||
__le64 LastWriteTime;
|
||||
__le64 ChangeTime;
|
||||
__le64 AllocationSize; /* Beginning of FILE_STANDARD_INFO equivalent */
|
||||
__le64 EndOfFile;
|
||||
__le32 Attributes;
|
||||
} __packed;
|
||||
|
||||
#endif /* _SMB2PDU_H */
|
||||
|
|
|
|||
|
|
@ -36,6 +36,8 @@ extern int map_smb2_to_linux_error(char *buf, bool log_err);
|
|||
extern int smb2_check_message(char *buf, unsigned int length);
|
||||
extern unsigned int smb2_calc_size(struct smb2_hdr *hdr);
|
||||
extern char *smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr);
|
||||
extern __le16 *cifs_convert_path_to_utf16(const char *from,
|
||||
struct cifs_sb_info *cifs_sb);
|
||||
|
||||
extern int smb2_check_receive(struct mid_q_entry *mid,
|
||||
struct TCP_Server_Info *server, bool log_error);
|
||||
|
|
@ -54,5 +56,11 @@ extern int SMB2_tcon(const unsigned int xid, struct cifs_ses *ses,
|
|||
const char *tree, struct cifs_tcon *tcon,
|
||||
const struct nls_table *);
|
||||
extern int SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon);
|
||||
extern int SMB2_open(const unsigned int xid, struct cifs_tcon *tcon,
|
||||
__le16 *path, u64 *persistent_fid, u64 *volatile_fid,
|
||||
__u32 desired_access, __u32 create_disposition,
|
||||
__u32 file_attributes, __u32 create_options);
|
||||
extern int SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
|
||||
u64 persistent_file_id, u64 volatile_file_id);
|
||||
|
||||
#endif /* _SMB2PROTO_H */
|
||||
|
|
|
|||
Reference in New Issue