From: Pavel Shilovsky <piastry@xxxxxxxxxxx>
that needs for a successful mount through SMB2 protocol.
Signed-off-by: Pavel Shilovsky <piastry@xxxxxxxxxxx>
---
fs/cifs/cifs_unicode.c | 61 +++++++++++++++++
fs/cifs/cifs_unicode.h | 5 ++
fs/cifs/smb2misc.c | 25 +++++++
fs/cifs/smb2ops.c | 25 +++++++
fs/cifs/smb2pdu.c | 130 +++++++++++++++++++++++++++++++++++++
fs/cifs/smb2pdu.h | 167 ++++++++++++++++++++++++++++++++++++++++++++++++
fs/cifs/smb2proto.h | 8 ++
7 files changed, 421 insertions(+), 0 deletions(-)
diff --git a/fs/cifs/cifs_unicode.c b/fs/cifs/cifs_unicode.c
index 97c1d42..7dab9c0 100644
--- a/fs/cifs/cifs_unicode.c
+++ b/fs/cifs/cifs_unicode.c
@@ -330,3 +330,64 @@ cifsConvertToUTF16(__le16 *target, const char *source, int srclen,
ctoUTF16_out:
return i;
}
+
+#ifdef CONFIG_CIFS_SMB2
+/*
+ * cifs_local_to_utf16_bytes - how long will a string be after conversion?
+ * @from - pointer to input string
+ * @maxbytes - don't go past this many bytes of input string
+ * @codepage - source codepage
+ *
+ * Walk a string and return the number of bytes that the string will
+ * be after being converted to the given charset, not including any null
+ * termination required. Don't walk past maxbytes in the source buffer.
+ */
+
+static int
+cifs_local_to_utf16_bytes(const char *from, int len,
+ const struct nls_table *codepage)
+{
+ int charlen;
+ int i;
+ wchar_t wchar_to;
+
+ for (i = 0; len && *from; i++, from += charlen, len -= charlen) {
+ charlen = codepage->char2uni(from, len, &wchar_to);
+ /* Failed conversion defaults to a question mark */
+ if (charlen < 1)
+ charlen = 1;
+ }
+ return 2 * i; /* UTF16 characters are two bytes */
+}
+
+/*
+ * cifs_strndup_to_utf16 - copy a string to wire format from the local codepage
+ * @src - source string
+ * @maxlen - don't walk past this many bytes in the source string
+ * @utf16_len - the length of the allocated string in bytes (including null)
+ * @cp - source codepage
+ * @remap - map special chars
+ *
+ * Take a string convert it from the local codepage to UTF16 and
+ * put it in a new buffer. Returns a pointer to the new string or NULL on
+ * error.
+ */
+__le16 *
+cifs_strndup_to_utf16(const char *src, const int maxlen, int *utf16_len,
+ const struct nls_table *cp, int remap)
+{
+ int len;
+ __le16 *dst;
+
+ len = cifs_local_to_utf16_bytes(src, maxlen, cp);
+ len += 2; /* NULL */
+ dst = kmalloc(len, GFP_KERNEL);
+ if (!dst) {
+ *utf16_len = 0;
+ return NULL;
+ }
+ cifsConvertToUTF16(dst, src, strlen(src), cp, remap);
+ *utf16_len = len;
+ return dst;
+}
+#endif /* CONFIG_CIFS_SMB2 */
diff --git a/fs/cifs/cifs_unicode.h b/fs/cifs/cifs_unicode.h
index a44c6eb..4fb0974 100644
--- a/fs/cifs/cifs_unicode.h
+++ b/fs/cifs/cifs_unicode.h
@@ -84,6 +84,11 @@ char *cifs_strndup_from_utf16(const char *src, const int maxlen,
const struct nls_table *codepage);
extern int cifsConvertToUTF16(__le16 *target, const char *source, int maxlen,
const struct nls_table *cp, int mapChars);
+#ifdef CONFIG_CIFS_SMB2
+extern __le16 *cifs_strndup_to_utf16(const char *src, const int maxlen,
+ int *utf16_len, const struct nls_table *cp,
+ int remap);
+#endif /* CONFIG_CIFS_SMB2 */
#endif
/*
diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c
index b690852..2c061fd 100644
--- a/fs/cifs/smb2misc.c
+++ b/fs/cifs/smb2misc.c
@@ -229,6 +229,11 @@ smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferLength);
break;
case SMB2_CREATE:
+ *off = le32_to_cpu(
+ ((struct smb2_create_rsp *)hdr)->CreateContextsOffset);
+ *len = le32_to_cpu(
+ ((struct smb2_create_rsp *)hdr)->CreateContextsLength);
+ break;
case SMB2_READ:
case SMB2_QUERY_INFO:
case SMB2_QUERY_DIRECTORY:
@@ -312,3 +317,23 @@ calc_size_exit:
cFYI(1, "smb2 len %d", len);
return len;
}
+
+/* Note: caller must free return buffer */
+__le16 *
+cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
+{
+ int len;
+ const char *start_of_path;
+ __le16 *to;
+
+ /* Windows doesn't allow paths beginning with \ */
+ if (from[0] == '\\')
+ start_of_path = from + 1;
+ else
+ start_of_path = from;
+ to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
+ cifs_sb->local_nls,
+ cifs_sb->mnt_cifs_flags &
+ CIFS_MOUNT_MAP_SPECIAL_CHR);
+ return to;
+}
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index a904b35..75904b7 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -156,6 +156,30 @@ smb2_negotiate(const int xid, struct cifs_ses *ses)
return rc;
}
+static int
+smb2_is_path_accessible(const int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, const char *full_path)
+{
+ int rc;
+ __u64 persistent_fid, volatile_fid;
+ __le16 *utf16_path;
+
+ utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
+ if (!utf16_path)
+ return -ENOMEM;
+
+ rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
+ FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0);
+ if (rc) {
+ kfree(utf16_path);
+ return rc;
+ }
+
+ rc = SMB2_close(xid, tcon, persistent_fid, volatile_fid);
+ kfree(utf16_path);
+ return rc;
+}
+
struct smb_version_operations smb21_operations = {
.setup_request = smb2_setup_request,
.check_receive = smb2_check_receive,
@@ -173,6 +197,7 @@ struct smb_version_operations smb21_operations = {
.logoff = SMB2_logoff,
.tree_connect = SMB2_tcon,
.tree_disconnect = SMB2_tdis,
+ .is_path_accessible = smb2_is_path_accessible,
};
struct smb_version_values smb21_values = {
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 9ec0bfe..e56ea77 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -839,3 +839,133 @@ SMB2_tdis(const int xid, struct cifs_tcon *tcon)
return rc;
}
+
+int SMB2_open(const 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)
+{
+ struct smb2_create_req *pSMB2;
+ struct smb2_create_rsp *pSMB2r;
+ struct TCP_Server_Info *server;
+ struct cifs_ses *ses = tcon->ses;
+ struct kvec iov[2];
+ int resp_buftype;
+ int uni_path_len;
+ int rc = 0;
+ int num_iovecs = 2;
+
+ cFYI(1, "create/open");
+
+ if (ses && (ses->server))
+ server = ses->server;
+ else
+ return -EIO;
+
+ rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &pSMB2);
+ if (rc)
+ return rc;
+
+ if (enable_oplocks)
+ pSMB2->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_BATCH;
+ else
+ pSMB2->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
+ pSMB2->ImpersonationLevel = IL_IMPERSONATION;
+ pSMB2->DesiredAccess = cpu_to_le32(desired_access);
+ /* File attributes ignored on open (used in create though) */
+ pSMB2->FileAttributes = cpu_to_le32(file_attributes);
+ pSMB2->ShareAccess = FILE_SHARE_ALL_LE;
+ pSMB2->CreateDisposition = cpu_to_le32(create_disposition);
+ pSMB2->CreateOptions = cpu_to_le32(create_options);
+ uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
+ pSMB2->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
+ - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
+
+ iov[0].iov_base = (char *)pSMB2;
+
+ /* rfc1001 length field is 4 bytes so added below */
+ iov[0].iov_len = be32_to_cpu(pSMB2->hdr.smb2_buf_length) + 4;
+
+ /* MUST set path len (NameLength) to 0 opening root of share */
+ if (uni_path_len >= 4) {
+ pSMB2->NameLength = cpu_to_le16(uni_path_len - 2);
+ /* -1 since last byte is buf[0] which is sent below (path) */
+ iov[0].iov_len--;
+ iov[1].iov_len = uni_path_len;
+ iov[1].iov_base = path;
+ /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
+ pSMB2->hdr.smb2_buf_length = cpu_to_be32(be32_to_cpu(
+ pSMB2->hdr.smb2_buf_length) + uni_path_len - 1);
+ } else {
+ num_iovecs = 1;
+ pSMB2->NameLength = 0;
+ }
+
+ rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
+ pSMB2r = (struct smb2_create_rsp *)iov[0].iov_base;
+
+ if (rc != 0) {
+ cifs_stats_fail_inc(tcon, SMB2CREATE);
+ goto creat_exit;
+ }
+
+ if (pSMB2r == NULL) {
+ rc = -EIO;
+ goto creat_exit;
+ }
+ *persistent_fid = pSMB2r->PersistentFileId;
+ *volatile_fid = pSMB2r->VolatileFileId;
+creat_exit:
+ free_rsp_buf(resp_buftype, pSMB2r);
+ return rc;
+}
+
+int SMB2_close(const int xid, struct cifs_tcon *tcon,
+ u64 persistent_file_id, u64 volatile_file_id)
+{
+ struct smb2_close_req *pSMB2;
+ struct smb2_close_rsp *pSMB2r;
+ struct TCP_Server_Info *server;
+ struct cifs_ses *ses = tcon->ses;
+ struct kvec iov[1];
+ int resp_buftype;
+ int rc = 0;
+
+ cFYI(1, "Close");
+
+ if (ses && (ses->server))
+ server = ses->server;
+ else
+ return -EIO;
+
+ rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &pSMB2);
+ if (rc)
+ return rc;
+
+ pSMB2->PersistentFileId = persistent_file_id;
+ pSMB2->VolatileFileId = volatile_file_id;
+
+ iov[0].iov_base = (char *)pSMB2;
+ iov[0].iov_len = be32_to_cpu(pSMB2->hdr.smb2_buf_length)
+ + 4 /* rfc1001 len */;
+
+ rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
+ pSMB2r = (struct smb2_close_rsp *)iov[0].iov_base;
+
+ if (rc != 0) {
+ if (tcon)
+ cifs_stats_fail_inc(tcon, SMB2CLOSE);
+ goto close_exit;
+ }
+
+ if (pSMB2r == NULL) {
+ rc = -EIO;
+ goto close_exit;
+ }
+
+ /* BB FIXME - decode close response, update inode for caching */
+
+close_exit:
+ free_rsp_buf(resp_buftype, pSMB2r);
+ return rc;
+}
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index 007de36..6101ba2 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -275,4 +275,171 @@ struct smb2_tree_disconnect_rsp {
__le16 Reserved;
} __packed;
+/* File Attrubutes */
+#define FILE_ATTRIBUTE_READONLY 0x00000001
+#define FILE_ATTRIBUTE_HIDDEN 0x00000002
+#define FILE_ATTRIBUTE_SYSTEM 0x00000004
+#define FILE_ATTRIBUTE_DIRECTORY 0x00000010
+#define FILE_ATTRIBUTE_ARCHIVE 0x00000020
+#define FILE_ATTRIBUTE_NORMAL 0x00000080
+#define FILE_ATTRIBUTE_TEMPORARY 0x00000100
+#define FILE_ATTRIBUTE_SPARSE_FILE 0x00000200
+#define FILE_ATTRIBUTE_REPARSE_POINT 0x00000400
+#define FILE_ATTRIBUTE_COMPRESSED 0x00000800
+#define FILE_ATTRIBUTE_OFFLINE 0x00001000
+#define FILE_ATTRIBUTE_NOT_CONTENT_INDEXED 0x00002000
+#define FILE_ATTRIBUTE_ENCRYPTED 0x00004000
+
+/* Oplock levels */
+#define SMB2_OPLOCK_LEVEL_NONE 0x00
+#define SMB2_OPLOCK_LEVEL_II 0x01
+#define SMB2_OPLOCK_LEVEL_EXCLUSIVE 0x08
+#define SMB2_OPLOCK_LEVEL_BATCH 0x09
+#define SMB2_OPLOCK_LEVEL_LEASE 0xFF
+
+/* Desired Access Flags */
+#define FILE_READ_DATA_LE cpu_to_le32(0x00000001)
+#define FILE_WRITE_DATA_LE cpu_to_le32(0x00000002)
+#define FILE_APPEND_DATA_LE cpu_to_le32(0x00000004)
+#define FILE_READ_EA_LE cpu_to_le32(0x00000008)
+#define FILE_WRITE_EA_LE cpu_to_le32(0x00000010)
+#define FILE_EXECUTE_LE cpu_to_le32(0x00000020)
+#define FILE_READ_ATTRIBUTES_LE cpu_to_le32(0x00000080)
+#define FILE_WRITE_ATTRIBUTES_LE cpu_to_le32(0x00000100)
+#define FILE_DELETE_LE cpu_to_le32(0x00010000)
+#define FILE_READ_CONTROL_LE cpu_to_le32(0x00020000)
+#define FILE_WRITE_DAC_LE cpu_to_le32(0x00040000)
+#define FILE_WRITE_OWNER_LE cpu_to_le32(0x00080000)
+#define FILE_SYNCHRONIZE_LE cpu_to_le32(0x00100000)
+#define FILE_ACCESS_SYSTEM_SECURITY_LE cpu_to_le32(0x01000000)
+#define FILE_MAXIMAL_ACCESS_LE cpu_to_le32(0x02000000)
+#define FILE_GENERIC_ALL_LE cpu_to_le32(0x10000000)
+#define FILE_GENERIC_EXECUTE_LE cpu_to_le32(0x20000000)
+#define FILE_GENERIC_WRITE_LE cpu_to_le32(0x40000000)
+#define FILE_GENERIC_READ_LE cpu_to_le32(0x80000000)
+
+/* ShareAccess Flags */
+#define FILE_SHARE_READ_LE cpu_to_le32(0x00000001)
+#define FILE_SHARE_WRITE_LE cpu_to_le32(0x00000002)
+#define FILE_SHARE_DELETE_LE cpu_to_le32(0x00000004)
+#define FILE_SHARE_ALL_LE cpu_to_le32(0x00000007)
+
+/* CreateDisposition Flags */
+#define FILE_SUPERSEDE_LE cpu_to_le32(0x00000000)
+#define FILE_OPEN_LE cpu_to_le32(0x00000001)
+#define FILE_CREATE_LE cpu_to_le32(0x00000002)
+#define FILE_OPEN_IF_LE cpu_to_le32(0x00000003)
+#define FILE_OVERWRITE_LE cpu_to_le32(0x00000004)
+#define FILE_OVERWRITE_IF_LE cpu_to_le32(0x00000005)
+
+/* CreateOptions Flags */
+#define FILE_DIRECTORY_FILE_LE cpu_to_le32(0x00000001)
+/* same as #define CREATE_NOT_FILE_LE cpu_to_le32(0x00000001) */
+#define FILE_WRITE_THROUGH_LE cpu_to_le32(0x00000002)
+#define FILE_SEQUENTIAL_ONLY_LE cpu_to_le32(0x00000004)
+#define FILE_NO_INTERMEDIATE_BUFFERRING_LE cpu_to_le32(0x00000008)
+#define FILE_SYNCHRONOUS_IO_ALERT_LE cpu_to_le32(0x00000010)
+#define FILE_SYNCHRONOUS_IO_NON_ALERT_LE cpu_to_le32(0x00000020)
+#define FILE_NON_DIRECTORY_FILE_LE cpu_to_le32(0x00000040)
+#define FILE_COMPLETE_IF_OPLOCKED_LE cpu_to_le32(0x00000100)
+#define FILE_NO_EA_KNOWLEDGE_LE cpu_to_le32(0x00000200)
+#define FILE_RANDOM_ACCESS_LE cpu_to_le32(0x00000800)
+#define FILE_DELETE_ON_CLOSE_LE cpu_to_le32(0x00001000)
+#define FILE_OPEN_BY_FILE_ID_LE cpu_to_le32(0x00002000)
+#define FILE_OPEN_FOR_BACKUP_INTENT_LE cpu_to_le32(0x00004000)
+#define FILE_NO_COMPRESSION_LE cpu_to_le32(0x00008000)
+#define FILE_RESERVE_OPFILTER_LE cpu_to_le32(0x00100000)
+#define FILE_OPEN_REPARSE_POINT_LE cpu_to_le32(0x00200000)
+#define FILE_OPEN_NO_RECALL_LE cpu_to_le32(0x00400000)
+#define FILE_OPEN_FOR_FREE_SPACE_QUERY_LE cpu_to_le32(0x00800000)
+
+#define FILE_READ_RIGHTS_LE (FILE_READ_DATA_LE | FILE_READ_EA_LE \
+ | FILE_READ_ATTRIBUTES_LE)
+#define FILE_WRITE_RIGHTS_LE (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE \
+ | FILE_WRITE_EA_LE | FILE_WRITE_ATTRIBUTES_LE)
+#define FILE_EXEC_RIGHTS_LE (FILE_EXECUTE_LE)
+
+/* Impersonation Levels */
+#define IL_ANONYMOUS cpu_to_le32(0x00000000)
+#define IL_IDENTIFICATION cpu_to_le32(0x00000001)
+#define IL_IMPERSONATION cpu_to_le32(0x00000002)
+#define IL_DELEGATE cpu_to_le32(0x00000003)
+
+/* Create Context Values */
+#define SMB2_CREATE_EA_BUFFER "ExtA" /* extended attributes */
+#define SMB2_CREATE_SD_BUFFER "SecD" /* security descriptor */
+#define SMB2_CREATE_DURABLE_HANDLE_REQUEST "DHnQ"
+#define SMB2_CREATE_DURABLE_HANDLE_RECONNECT "DHnC"
+#define SMB2_CREATE_ALLOCATION_SIZE "AlSi"
+#define SMB2_CREATE_QUERY_MAXIMAL_ACCESS_REQUEST "MxAc"
+#define SMB2_CREATE_TIMEWARP_REQUEST "TWrp"
+#define SMB2_CREATE_QUERY_ON_DISK_ID "QFid"
+#define SMB2_CREATE_REQUEST_LEASE "RqLs"
+
+struct smb2_create_req {
+ 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 */
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index 0d51482..5ffc5ec 100644
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.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 int xid, struct cifs_ses *ses,
const char *tree, struct cifs_tcon *tcon,
const struct nls_table *);
extern int SMB2_tdis(const int xid, struct cifs_tcon *tcon);
+extern int SMB2_open(const 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 int xid, struct cifs_tcon *tcon,
+ u64 persistent_file_id, u64 volatile_file_id);
#endif /* _SMB2PROTO_H */
--
1.7.1
--
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