From 2503a0dba989486c59523a947a1dcb50ad90fee9 Mon Sep 17 00:00:00 2001 From: Pavel Shilovsky Date: Mon, 26 Dec 2011 22:58:46 +0400 Subject: [PATCH] CIFS: Add SMB2 support for is_path_accessible that needs for a successful mount through SMB2 protocol. Signed-off-by: Pavel Shilovsky Signed-off-by: Steve French --- 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 | 132 ++++++++++++++++++++++++++++++++ fs/cifs/smb2pdu.h | 167 +++++++++++++++++++++++++++++++++++++++++ fs/cifs/smb2proto.h | 8 ++ 7 files changed, 423 insertions(+) diff --git a/fs/cifs/cifs_unicode.c b/fs/cifs/cifs_unicode.c index 97c1d4210869..7dab9c04ad52 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 a44c6eb8a4d7..4fb097468e21 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 10729a74da27..eb73a136641c 100644 --- a/fs/cifs/smb2misc.c +++ b/fs/cifs/smb2misc.c @@ -230,6 +230,11 @@ 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: @@ -315,3 +320,23 @@ 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 0e33ca32abf9..1266137406fa 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -157,6 +157,30 @@ smb2_negotiate(const unsigned int xid, struct cifs_ses *ses) return rc; } +static int +smb2_is_path_accessible(const unsigned 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, @@ -174,6 +198,7 @@ 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 48c04b2832e2..ef0769c398a5 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -829,3 +829,135 @@ SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon) return rc; } + +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) +{ + struct smb2_create_req *req; + struct smb2_create_rsp *rsp; + 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 **) &req); + if (rc) + return rc; + + if (enable_oplocks) + req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_BATCH; + else + req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE; + req->ImpersonationLevel = IL_IMPERSONATION; + req->DesiredAccess = cpu_to_le32(desired_access); + /* File attributes ignored on open (used in create though) */ + req->FileAttributes = cpu_to_le32(file_attributes); + req->ShareAccess = FILE_SHARE_ALL_LE; + req->CreateDisposition = cpu_to_le32(create_disposition); + req->CreateOptions = cpu_to_le32(create_options); + uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2; + req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) + - 1 /* pad */ - 4 /* do not count rfc1001 len field */); + + iov[0].iov_base = (char *)req; + /* 4 for rfc1002 length field */ + iov[0].iov_len = get_rfc1002_length(req) + 4; + + /* MUST set path len (NameLength) to 0 opening root of share */ + if (uni_path_len >= 4) { + req->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. + */ + inc_rfc1001_len(req, uni_path_len - 1); + } else { + num_iovecs = 1; + req->NameLength = 0; + } + + rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0); + rsp = (struct smb2_create_rsp *)iov[0].iov_base; + + if (rc != 0) { + cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); + goto creat_exit; + } + + if (rsp == NULL) { + rc = -EIO; + goto creat_exit; + } + *persistent_fid = rsp->PersistentFileId; + *volatile_fid = rsp->VolatileFileId; +creat_exit: + free_rsp_buf(resp_buftype, rsp); + return rc; +} + +int +SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, + u64 persistent_fid, u64 volatile_fid) +{ + struct smb2_close_req *req; + struct smb2_close_rsp *rsp; + 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 **) &req); + if (rc) + return rc; + + req->PersistentFileId = persistent_fid; + req->VolatileFileId = volatile_fid; + + iov[0].iov_base = (char *)req; + /* 4 for rfc1002 length field */ + iov[0].iov_len = get_rfc1002_length(req) + 4; + + rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0); + rsp = (struct smb2_close_rsp *)iov[0].iov_base; + + if (rc != 0) { + if (tcon) + cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE); + goto close_exit; + } + + if (rsp == NULL) { + rc = -EIO; + goto close_exit; + } + + /* BB FIXME - decode close response, update inode for caching */ + +close_exit: + free_rsp_buf(resp_buftype, rsp); + return rc; +} diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h index aa77bf3a7a69..5cd358ef312e 100644 --- a/fs/cifs/smb2pdu.h +++ b/fs/cifs/smb2pdu.h @@ -281,4 +281,171 @@ 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 bc7299349dbf..85aa8d5ea41a 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 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 */ -- 2.20.1