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path: root/fs/cifs/cifssmb.c
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Diffstat (limited to 'fs/cifs/cifssmb.c')
-rw-r--r--fs/cifs/cifssmb.c315
1 files changed, 192 insertions, 123 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 95fbba4ea7d4..7b9938445b07 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -81,6 +81,40 @@ static struct {
#endif /* CONFIG_CIFS_WEAK_PW_HASH */
#endif /* CIFS_POSIX */
+/* Allocates buffer into dst and copies smb string from src to it.
+ * caller is responsible for freeing dst if function returned 0.
+ * returns:
+ * on success - 0
+ * on failure - errno
+ */
+static int
+cifs_strncpy_to_host(char **dst, const char *src, const int maxlen,
+ const bool is_unicode, const struct nls_table *nls_codepage)
+{
+ int plen;
+
+ if (is_unicode) {
+ plen = UniStrnlen((wchar_t *)src, maxlen);
+ *dst = kmalloc(plen + 2, GFP_KERNEL);
+ if (!*dst)
+ goto cifs_strncpy_to_host_ErrExit;
+ cifs_strfromUCS_le(*dst, (__le16 *)src, plen, nls_codepage);
+ } else {
+ plen = strnlen(src, maxlen);
+ *dst = kmalloc(plen + 2, GFP_KERNEL);
+ if (!*dst)
+ goto cifs_strncpy_to_host_ErrExit;
+ strncpy(*dst, src, plen);
+ }
+ (*dst)[plen] = 0;
+ (*dst)[plen+1] = 0; /* harmless for ASCII case, needed for Unicode */
+ return 0;
+
+cifs_strncpy_to_host_ErrExit:
+ cERROR(1, ("Failed to allocate buffer for string\n"));
+ return -ENOMEM;
+}
+
/* Mark as invalid, all open files on tree connections since they
were closed when session to server was lost */
@@ -1166,6 +1200,20 @@ static __u16 convert_disposition(int disposition)
return ofun;
}
+static int
+access_flags_to_smbopen_mode(const int access_flags)
+{
+ int masked_flags = access_flags & (GENERIC_READ | GENERIC_WRITE);
+
+ if (masked_flags == GENERIC_READ)
+ return SMBOPEN_READ;
+ else if (masked_flags == GENERIC_WRITE)
+ return SMBOPEN_WRITE;
+
+ /* just go for read/write */
+ return SMBOPEN_READWRITE;
+}
+
int
SMBLegacyOpen(const int xid, struct cifsTconInfo *tcon,
const char *fileName, const int openDisposition,
@@ -1207,13 +1255,7 @@ OldOpenRetry:
pSMB->OpenFlags = cpu_to_le16(REQ_BATCHOPLOCK);
pSMB->OpenFlags |= cpu_to_le16(REQ_MORE_INFO);
- /* BB fixme add conversion for access_flags to bits 0 - 2 of mode */
- /* 0 = read
- 1 = write
- 2 = rw
- 3 = execute
- */
- pSMB->Mode = cpu_to_le16(2);
+ pSMB->Mode = cpu_to_le16(access_flags_to_smbopen_mode(access_flags));
pSMB->Mode |= cpu_to_le16(0x40); /* deny none */
/* set file as system file if special file such
as fifo and server expecting SFU style and
@@ -1247,7 +1289,7 @@ OldOpenRetry:
} else {
/* BB verify if wct == 15 */
-/* *pOplock = pSMBr->OplockLevel; */ /* BB take from action field BB */
+/* *pOplock = pSMBr->OplockLevel; */ /* BB take from action field*/
*netfid = pSMBr->Fid; /* cifs fid stays in le */
/* Let caller know file was created so we can set the mode. */
@@ -1767,7 +1809,7 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
cFYI(1, ("Posix Lock"));
if (pLockData == NULL)
- return EINVAL;
+ return -EINVAL;
rc = small_smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB);
@@ -1944,7 +1986,7 @@ renameRetry:
/* protocol requires ASCII signature byte on Unicode string */
pSMB->OldFileName[name_len + 1] = 0x00;
name_len2 =
- cifsConvertToUCS((__le16 *) &pSMB->OldFileName[name_len + 2],
+ cifsConvertToUCS((__le16 *)&pSMB->OldFileName[name_len + 2],
toName, PATH_MAX, nls_codepage, remap);
name_len2 += 1 /* trailing null */ + 1 /* Signature word */ ;
name_len2 *= 2; /* convert to bytes */
@@ -2925,7 +2967,8 @@ setAclRetry:
}
params = 6 + name_len;
pSMB->MaxParameterCount = cpu_to_le16(2);
- pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find max SMB size from sess */
+ /* BB find max SMB size from sess */
+ pSMB->MaxDataCount = cpu_to_le16(1000);
pSMB->MaxSetupCount = 0;
pSMB->Reserved = 0;
pSMB->Flags = 0;
@@ -3322,7 +3365,8 @@ QPathInfoRetry:
params = 2 /* level */ + 4 /* reserved */ + name_len /* includes NUL */;
pSMB->TotalDataCount = 0;
pSMB->MaxParameterCount = cpu_to_le16(2);
- pSMB->MaxDataCount = cpu_to_le16(4000); /* BB find exact max SMB PDU from sess structure BB */
+ /* BB find exact max SMB PDU from sess structure BB */
+ pSMB->MaxDataCount = cpu_to_le16(4000);
pSMB->MaxSetupCount = 0;
pSMB->Reserved = 0;
pSMB->Flags = 0;
@@ -3388,7 +3432,7 @@ QPathInfoRetry:
int
CIFSSMBUnixQPathInfo(const int xid, struct cifsTconInfo *tcon,
const unsigned char *searchName,
- FILE_UNIX_BASIC_INFO * pFindData,
+ FILE_UNIX_BASIC_INFO *pFindData,
const struct nls_table *nls_codepage, int remap)
{
/* SMB_QUERY_FILE_UNIX_BASIC */
@@ -3679,6 +3723,7 @@ int CIFSFindNext(const int xid, struct cifsTconInfo *tcon,
if (rc) {
if (rc == -EBADF) {
psrch_inf->endOfSearch = true;
+ cifs_buf_release(pSMB);
rc = 0; /* search probably was closed at end of search*/
} else
cFYI(1, ("FindNext returned = %d", rc));
@@ -3856,25 +3901,112 @@ GetInodeNumOut:
return rc;
}
+/* parses DFS refferal V3 structure
+ * caller is responsible for freeing target_nodes
+ * returns:
+ * on success - 0
+ * on failure - errno
+ */
+static int
+parse_DFS_referrals(TRANSACTION2_GET_DFS_REFER_RSP *pSMBr,
+ unsigned int *num_of_nodes,
+ struct dfs_info3_param **target_nodes,
+ const struct nls_table *nls_codepage)
+{
+ int i, rc = 0;
+ char *data_end;
+ bool is_unicode;
+ struct dfs_referral_level_3 *ref;
+
+ is_unicode = pSMBr->hdr.Flags2 & SMBFLG2_UNICODE;
+ *num_of_nodes = le16_to_cpu(pSMBr->NumberOfReferrals);
+
+ if (*num_of_nodes < 1) {
+ cERROR(1, ("num_referrals: must be at least > 0,"
+ "but we get num_referrals = %d\n", *num_of_nodes));
+ rc = -EINVAL;
+ goto parse_DFS_referrals_exit;
+ }
+
+ ref = (struct dfs_referral_level_3 *) &(pSMBr->referrals);
+ if (ref->VersionNumber != 3) {
+ cERROR(1, ("Referrals of V%d version are not supported,"
+ "should be V3", ref->VersionNumber));
+ rc = -EINVAL;
+ goto parse_DFS_referrals_exit;
+ }
+
+ /* get the upper boundary of the resp buffer */
+ data_end = (char *)(&(pSMBr->PathConsumed)) +
+ le16_to_cpu(pSMBr->t2.DataCount);
+
+ cFYI(1, ("num_referrals: %d dfs flags: 0x%x ... \n",
+ *num_of_nodes,
+ le16_to_cpu(pSMBr->DFSFlags)));
+
+ *target_nodes = kzalloc(sizeof(struct dfs_info3_param) *
+ *num_of_nodes, GFP_KERNEL);
+ if (*target_nodes == NULL) {
+ cERROR(1, ("Failed to allocate buffer for target_nodes\n"));
+ rc = -ENOMEM;
+ goto parse_DFS_referrals_exit;
+ }
+
+ /* collect neccessary data from referrals */
+ for (i = 0; i < *num_of_nodes; i++) {
+ char *temp;
+ int max_len;
+ struct dfs_info3_param *node = (*target_nodes)+i;
+
+ node->flags = le16_to_cpu(pSMBr->DFSFlags);
+ node->path_consumed = le16_to_cpu(pSMBr->PathConsumed);
+ node->server_type = le16_to_cpu(ref->ServerType);
+ node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags);
+
+ /* copy DfsPath */
+ temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset);
+ max_len = data_end - temp;
+ rc = cifs_strncpy_to_host(&(node->path_name), temp,
+ max_len, is_unicode, nls_codepage);
+ if (rc)
+ goto parse_DFS_referrals_exit;
+
+ /* copy link target UNC */
+ temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset);
+ max_len = data_end - temp;
+ rc = cifs_strncpy_to_host(&(node->node_name), temp,
+ max_len, is_unicode, nls_codepage);
+ if (rc)
+ goto parse_DFS_referrals_exit;
+
+ ref += ref->Size;
+ }
+
+parse_DFS_referrals_exit:
+ if (rc) {
+ free_dfs_info_array(*target_nodes, *num_of_nodes);
+ *target_nodes = NULL;
+ *num_of_nodes = 0;
+ }
+ return rc;
+}
+
int
CIFSGetDFSRefer(const int xid, struct cifsSesInfo *ses,
const unsigned char *searchName,
- unsigned char **targetUNCs,
- unsigned int *number_of_UNC_in_array,
+ struct dfs_info3_param **target_nodes,
+ unsigned int *num_of_nodes,
const struct nls_table *nls_codepage, int remap)
{
/* TRANS2_GET_DFS_REFERRAL */
TRANSACTION2_GET_DFS_REFER_REQ *pSMB = NULL;
TRANSACTION2_GET_DFS_REFER_RSP *pSMBr = NULL;
- struct dfs_referral_level_3 *referrals = NULL;
int rc = 0;
int bytes_returned;
int name_len;
- unsigned int i;
- char *temp;
__u16 params, byte_count;
- *number_of_UNC_in_array = 0;
- *targetUNCs = NULL;
+ *num_of_nodes = 0;
+ *target_nodes = NULL;
cFYI(1, ("In GetDFSRefer the path %s", searchName));
if (ses == NULL)
@@ -3921,7 +4053,8 @@ getDFSRetry:
pSMB->DataCount = 0;
pSMB->DataOffset = 0;
pSMB->MaxParameterCount = 0;
- pSMB->MaxDataCount = cpu_to_le16(4000); /* BB find exact max SMB PDU from sess structure BB */
+ /* BB find exact max SMB PDU from sess structure BB */
+ pSMB->MaxDataCount = cpu_to_le16(4000);
pSMB->MaxSetupCount = 0;
pSMB->Reserved = 0;
pSMB->Flags = 0;
@@ -3943,100 +4076,24 @@ getDFSRetry:
(struct smb_hdr *) pSMBr, &bytes_returned, 0);
if (rc) {
cFYI(1, ("Send error in GetDFSRefer = %d", rc));
- } else { /* decode response */
-/* BB Add logic to parse referrals here */
- rc = validate_t2((struct smb_t2_rsp *)pSMBr);
+ goto GetDFSRefExit;
+ }
+ rc = validate_t2((struct smb_t2_rsp *)pSMBr);
- /* BB Also check if enough total bytes returned? */
- if (rc || (pSMBr->ByteCount < 17))
- rc = -EIO; /* bad smb */
- else {
- __u16 data_offset = le16_to_cpu(pSMBr->t2.DataOffset);
- __u16 data_count = le16_to_cpu(pSMBr->t2.DataCount);
+ /* BB Also check if enough total bytes returned? */
+ if (rc || (pSMBr->ByteCount < 17)) {
+ rc = -EIO; /* bad smb */
+ goto GetDFSRefExit;
+ }
- cFYI(1,
- ("Decoding GetDFSRefer response BCC: %d Offset %d",
- pSMBr->ByteCount, data_offset));
- referrals =
- (struct dfs_referral_level_3 *)
- (8 /* sizeof start of data block */ +
- data_offset +
- (char *) &pSMBr->hdr.Protocol);
- cFYI(1, ("num_referrals: %d dfs flags: 0x%x ... \n"
- "for referral one refer size: 0x%x srv "
- "type: 0x%x refer flags: 0x%x ttl: 0x%x",
- le16_to_cpu(pSMBr->NumberOfReferrals),
- le16_to_cpu(pSMBr->DFSFlags),
- le16_to_cpu(referrals->ReferralSize),
- le16_to_cpu(referrals->ServerType),
- le16_to_cpu(referrals->ReferralFlags),
- le16_to_cpu(referrals->TimeToLive)));
- /* BB This field is actually two bytes in from start of
- data block so we could do safety check that DataBlock
- begins at address of pSMBr->NumberOfReferrals */
- *number_of_UNC_in_array =
- le16_to_cpu(pSMBr->NumberOfReferrals);
-
- /* BB Fix below so can return more than one referral */
- if (*number_of_UNC_in_array > 1)
- *number_of_UNC_in_array = 1;
-
- /* get the length of the strings describing refs */
- name_len = 0;
- for (i = 0; i < *number_of_UNC_in_array; i++) {
- /* make sure that DfsPathOffset not past end */
- __u16 offset =
- le16_to_cpu(referrals->DfsPathOffset);
- if (offset > data_count) {
- /* if invalid referral, stop here and do
- not try to copy any more */
- *number_of_UNC_in_array = i;
- break;
- }
- temp = ((char *)referrals) + offset;
+ cFYI(1, ("Decoding GetDFSRefer response BCC: %d Offset %d",
+ pSMBr->ByteCount,
+ le16_to_cpu(pSMBr->t2.DataOffset)));
- if (pSMBr->hdr.Flags2 & SMBFLG2_UNICODE) {
- name_len += UniStrnlen((wchar_t *)temp,
- data_count);
- } else {
- name_len += strnlen(temp, data_count);
- }
- referrals++;
- /* BB add check that referral pointer does
- not fall off end PDU */
- }
- /* BB add check for name_len bigger than bcc */
- *targetUNCs =
- kmalloc(name_len+1+(*number_of_UNC_in_array),
- GFP_KERNEL);
- if (*targetUNCs == NULL) {
- rc = -ENOMEM;
- goto GetDFSRefExit;
- }
- /* copy the ref strings */
- referrals = (struct dfs_referral_level_3 *)
- (8 /* sizeof data hdr */ + data_offset +
- (char *) &pSMBr->hdr.Protocol);
-
- for (i = 0; i < *number_of_UNC_in_array; i++) {
- temp = ((char *)referrals) +
- le16_to_cpu(referrals->DfsPathOffset);
- if (pSMBr->hdr.Flags2 & SMBFLG2_UNICODE) {
- cifs_strfromUCS_le(*targetUNCs,
- (__le16 *) temp,
- name_len,
- nls_codepage);
- } else {
- strncpy(*targetUNCs, temp, name_len);
- }
- /* BB update target_uncs pointers */
- referrals++;
- }
- temp = *targetUNCs;
- temp[name_len] = 0;
- }
+ /* parse returned result into more usable form */
+ rc = parse_DFS_referrals(pSMBr, num_of_nodes,
+ target_nodes, nls_codepage);
- }
GetDFSRefExit:
if (pSMB)
cifs_buf_release(pSMB);
@@ -4229,7 +4286,8 @@ QFSAttributeRetry:
params = 2; /* level */
pSMB->TotalDataCount = 0;
pSMB->MaxParameterCount = cpu_to_le16(2);
- pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find exact max SMB PDU from sess structure BB */
+ /* BB find exact max SMB PDU from sess structure BB */
+ pSMB->MaxDataCount = cpu_to_le16(1000);
pSMB->MaxSetupCount = 0;
pSMB->Reserved = 0;
pSMB->Flags = 0;
@@ -4298,7 +4356,8 @@ QFSDeviceRetry:
params = 2; /* level */
pSMB->TotalDataCount = 0;
pSMB->MaxParameterCount = cpu_to_le16(2);
- pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find exact max SMB PDU from sess structure BB */
+ /* BB find exact max SMB PDU from sess structure BB */
+ pSMB->MaxDataCount = cpu_to_le16(1000);
pSMB->MaxSetupCount = 0;
pSMB->Reserved = 0;
pSMB->Flags = 0;
@@ -4369,7 +4428,8 @@ QFSUnixRetry:
pSMB->DataCount = 0;
pSMB->DataOffset = 0;
pSMB->MaxParameterCount = cpu_to_le16(2);
- pSMB->MaxDataCount = cpu_to_le16(100); /* BB find exact max SMB PDU from sess structure BB */
+ /* BB find exact max SMB PDU from sess structure BB */
+ pSMB->MaxDataCount = cpu_to_le16(100);
pSMB->MaxSetupCount = 0;
pSMB->Reserved = 0;
pSMB->Flags = 0;
@@ -4444,7 +4504,8 @@ SETFSUnixRetry:
offset = param_offset + params;
pSMB->MaxParameterCount = cpu_to_le16(4);
- pSMB->MaxDataCount = cpu_to_le16(100); /* BB find exact max SMB PDU from sess structure BB */
+ /* BB find exact max SMB PDU from sess structure BB */
+ pSMB->MaxDataCount = cpu_to_le16(100);
pSMB->SetupCount = 1;
pSMB->Reserved3 = 0;
pSMB->SubCommand = cpu_to_le16(TRANS2_SET_FS_INFORMATION);
@@ -4512,7 +4573,8 @@ QFSPosixRetry:
pSMB->DataCount = 0;
pSMB->DataOffset = 0;
pSMB->MaxParameterCount = cpu_to_le16(2);
- pSMB->MaxDataCount = cpu_to_le16(100); /* BB find exact max SMB PDU from sess structure BB */
+ /* BB find exact max SMB PDU from sess structure BB */
+ pSMB->MaxDataCount = cpu_to_le16(100);
pSMB->MaxSetupCount = 0;
pSMB->Reserved = 0;
pSMB->Flags = 0;
@@ -4702,7 +4764,8 @@ CIFSSMBSetFileSize(const int xid, struct cifsTconInfo *tcon, __u64 size,
count = sizeof(struct file_end_of_file_info);
pSMB->MaxParameterCount = cpu_to_le16(2);
- pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find max SMB PDU from sess */
+ /* BB find exact max SMB PDU from sess structure BB */
+ pSMB->MaxDataCount = cpu_to_le16(1000);
pSMB->SetupCount = 1;
pSMB->Reserved3 = 0;
pSMB->SubCommand = cpu_to_le16(TRANS2_SET_FILE_INFORMATION);
@@ -4789,7 +4852,8 @@ CIFSSMBSetFileTimes(const int xid, struct cifsTconInfo *tcon,
count = sizeof(FILE_BASIC_INFO);
pSMB->MaxParameterCount = cpu_to_le16(2);
- pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find max SMB PDU from sess */
+ /* BB find max SMB PDU from sess */
+ pSMB->MaxDataCount = cpu_to_le16(1000);
pSMB->SetupCount = 1;
pSMB->Reserved3 = 0;
pSMB->SubCommand = cpu_to_le16(TRANS2_SET_FILE_INFORMATION);
@@ -4856,7 +4920,8 @@ SetTimesRetry:
params = 6 + name_len;
count = sizeof(FILE_BASIC_INFO);
pSMB->MaxParameterCount = cpu_to_le16(2);
- pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find exact max SMB PDU from sess structure BB */
+ /* BB find max SMB PDU from sess structure BB */
+ pSMB->MaxDataCount = cpu_to_le16(1000);
pSMB->MaxSetupCount = 0;
pSMB->Reserved = 0;
pSMB->Flags = 0;
@@ -4986,7 +5051,8 @@ setPermsRetry:
params = 6 + name_len;
count = sizeof(FILE_UNIX_BASIC_INFO);
pSMB->MaxParameterCount = cpu_to_le16(2);
- pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find exact max SMB PDU from sess structure BB */
+ /* BB find max SMB PDU from sess structure BB */
+ pSMB->MaxDataCount = cpu_to_le16(1000);
pSMB->MaxSetupCount = 0;
pSMB->Reserved = 0;
pSMB->Flags = 0;
@@ -5169,7 +5235,8 @@ QAllEAsRetry:
params = 2 /* level */ + 4 /* reserved */ + name_len /* includes NUL */;
pSMB->TotalDataCount = 0;
pSMB->MaxParameterCount = cpu_to_le16(2);
- pSMB->MaxDataCount = cpu_to_le16(4000); /* BB find exact max SMB PDU from sess structure BB */
+ /* BB find exact max SMB PDU from sess structure BB */
+ pSMB->MaxDataCount = cpu_to_le16(4000);
pSMB->MaxSetupCount = 0;
pSMB->Reserved = 0;
pSMB->Flags = 0;
@@ -5317,7 +5384,8 @@ QEARetry:
params = 2 /* level */ + 4 /* reserved */ + name_len /* includes NUL */;
pSMB->TotalDataCount = 0;
pSMB->MaxParameterCount = cpu_to_le16(2);
- pSMB->MaxDataCount = cpu_to_le16(4000); /* BB find exact max SMB PDU from sess structure BB */
+ /* BB find exact max SMB PDU from sess structure BB */
+ pSMB->MaxDataCount = cpu_to_le16(4000);
pSMB->MaxSetupCount = 0;
pSMB->Reserved = 0;
pSMB->Flags = 0;
@@ -5475,7 +5543,8 @@ SetEARetry:
count = sizeof(*parm_data) + ea_value_len + name_len;
pSMB->MaxParameterCount = cpu_to_le16(2);
- pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find max SMB size from sess */
+ /* BB find max SMB PDU from sess */
+ pSMB->MaxDataCount = cpu_to_le16(1000);
pSMB->MaxSetupCount = 0;
pSMB->Reserved = 0;
pSMB->Flags = 0;
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-14 22:01:59 +0000