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438 lines
12 KiB
438 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2016 Namjae Jeon <[email protected]> |
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* Copyright (C) 2018 Samsung Electronics Co., Ltd. |
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*/ |
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#include "glob.h" |
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#include "nterr.h" |
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#include "smb2pdu.h" |
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#include "smb_common.h" |
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#include "smbstatus.h" |
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#include "mgmt/user_session.h" |
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#include "connection.h" |
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static int check_smb2_hdr(struct smb2_hdr *hdr) |
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{ |
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/* |
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* Make sure that this really is an SMB, that it is a response. |
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*/ |
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if (hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR) |
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return 1; |
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return 0; |
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} |
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/* |
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* The following table defines the expected "StructureSize" of SMB2 requests |
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* in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests. |
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* |
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* Note that commands are defined in smb2pdu.h in le16 but the array below is |
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* indexed by command in host byte order |
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*/ |
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static const __le16 smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = { |
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/* SMB2_NEGOTIATE */ cpu_to_le16(36), |
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/* SMB2_SESSION_SETUP */ cpu_to_le16(25), |
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/* SMB2_LOGOFF */ cpu_to_le16(4), |
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/* SMB2_TREE_CONNECT */ cpu_to_le16(9), |
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/* SMB2_TREE_DISCONNECT */ cpu_to_le16(4), |
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/* SMB2_CREATE */ cpu_to_le16(57), |
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/* SMB2_CLOSE */ cpu_to_le16(24), |
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/* SMB2_FLUSH */ cpu_to_le16(24), |
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/* SMB2_READ */ cpu_to_le16(49), |
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/* SMB2_WRITE */ cpu_to_le16(49), |
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/* SMB2_LOCK */ cpu_to_le16(48), |
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/* SMB2_IOCTL */ cpu_to_le16(57), |
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/* SMB2_CANCEL */ cpu_to_le16(4), |
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/* SMB2_ECHO */ cpu_to_le16(4), |
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/* SMB2_QUERY_DIRECTORY */ cpu_to_le16(33), |
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/* SMB2_CHANGE_NOTIFY */ cpu_to_le16(32), |
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/* SMB2_QUERY_INFO */ cpu_to_le16(41), |
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/* SMB2_SET_INFO */ cpu_to_le16(33), |
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/* use 44 for lease break */ |
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/* SMB2_OPLOCK_BREAK */ cpu_to_le16(36) |
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}; |
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/* |
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* The size of the variable area depends on the offset and length fields |
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* located in different fields for various SMB2 requests. SMB2 requests |
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* with no variable length info, show an offset of zero for the offset field. |
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*/ |
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static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = { |
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/* SMB2_NEGOTIATE */ true, |
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/* SMB2_SESSION_SETUP */ true, |
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/* SMB2_LOGOFF */ false, |
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/* SMB2_TREE_CONNECT */ true, |
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/* SMB2_TREE_DISCONNECT */ false, |
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/* SMB2_CREATE */ true, |
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/* SMB2_CLOSE */ false, |
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/* SMB2_FLUSH */ false, |
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/* SMB2_READ */ true, |
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/* SMB2_WRITE */ true, |
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/* SMB2_LOCK */ true, |
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/* SMB2_IOCTL */ true, |
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/* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */ |
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/* SMB2_ECHO */ false, |
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/* SMB2_QUERY_DIRECTORY */ true, |
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/* SMB2_CHANGE_NOTIFY */ false, |
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/* SMB2_QUERY_INFO */ true, |
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/* SMB2_SET_INFO */ true, |
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/* SMB2_OPLOCK_BREAK */ false |
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}; |
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/* |
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* Returns the pointer to the beginning of the data area. Length of the data |
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* area and the offset to it (from the beginning of the smb are also returned. |
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*/ |
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static char *smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr) |
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{ |
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*off = 0; |
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*len = 0; |
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/* error reqeusts do not have data area */ |
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if (hdr->Status && hdr->Status != STATUS_MORE_PROCESSING_REQUIRED && |
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(((struct smb2_err_rsp *)hdr)->StructureSize) == SMB2_ERROR_STRUCTURE_SIZE2_LE) |
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return NULL; |
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/* |
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* Following commands have data areas so we have to get the location |
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* of the data buffer offset and data buffer length for the particular |
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* command. |
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*/ |
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switch (hdr->Command) { |
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case SMB2_SESSION_SETUP: |
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*off = le16_to_cpu(((struct smb2_sess_setup_req *)hdr)->SecurityBufferOffset); |
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*len = le16_to_cpu(((struct smb2_sess_setup_req *)hdr)->SecurityBufferLength); |
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break; |
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case SMB2_TREE_CONNECT: |
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*off = le16_to_cpu(((struct smb2_tree_connect_req *)hdr)->PathOffset); |
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*len = le16_to_cpu(((struct smb2_tree_connect_req *)hdr)->PathLength); |
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break; |
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case SMB2_CREATE: |
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{ |
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if (((struct smb2_create_req *)hdr)->CreateContextsLength) { |
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*off = le32_to_cpu(((struct smb2_create_req *) |
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hdr)->CreateContextsOffset); |
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*len = le32_to_cpu(((struct smb2_create_req *) |
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hdr)->CreateContextsLength); |
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break; |
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} |
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*off = le16_to_cpu(((struct smb2_create_req *)hdr)->NameOffset); |
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*len = le16_to_cpu(((struct smb2_create_req *)hdr)->NameLength); |
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break; |
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} |
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case SMB2_QUERY_INFO: |
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*off = le16_to_cpu(((struct smb2_query_info_req *)hdr)->InputBufferOffset); |
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*len = le32_to_cpu(((struct smb2_query_info_req *)hdr)->InputBufferLength); |
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break; |
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case SMB2_SET_INFO: |
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*off = le16_to_cpu(((struct smb2_set_info_req *)hdr)->BufferOffset); |
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*len = le32_to_cpu(((struct smb2_set_info_req *)hdr)->BufferLength); |
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break; |
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case SMB2_READ: |
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*off = le16_to_cpu(((struct smb2_read_req *)hdr)->ReadChannelInfoOffset); |
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*len = le16_to_cpu(((struct smb2_read_req *)hdr)->ReadChannelInfoLength); |
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break; |
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case SMB2_WRITE: |
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if (((struct smb2_write_req *)hdr)->DataOffset) { |
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*off = le16_to_cpu(((struct smb2_write_req *)hdr)->DataOffset); |
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*len = le32_to_cpu(((struct smb2_write_req *)hdr)->Length); |
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break; |
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} |
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*off = le16_to_cpu(((struct smb2_write_req *)hdr)->WriteChannelInfoOffset); |
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*len = le16_to_cpu(((struct smb2_write_req *)hdr)->WriteChannelInfoLength); |
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break; |
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case SMB2_QUERY_DIRECTORY: |
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*off = le16_to_cpu(((struct smb2_query_directory_req *)hdr)->FileNameOffset); |
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*len = le16_to_cpu(((struct smb2_query_directory_req *)hdr)->FileNameLength); |
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break; |
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case SMB2_LOCK: |
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{ |
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int lock_count; |
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/* |
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* smb2_lock request size is 48 included single |
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* smb2_lock_element structure size. |
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*/ |
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lock_count = le16_to_cpu(((struct smb2_lock_req *)hdr)->LockCount) - 1; |
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if (lock_count > 0) { |
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*off = __SMB2_HEADER_STRUCTURE_SIZE + 48; |
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*len = sizeof(struct smb2_lock_element) * lock_count; |
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} |
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break; |
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} |
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case SMB2_IOCTL: |
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*off = le32_to_cpu(((struct smb2_ioctl_req *)hdr)->InputOffset); |
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*len = le32_to_cpu(((struct smb2_ioctl_req *)hdr)->InputCount); |
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break; |
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default: |
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ksmbd_debug(SMB, "no length check for command\n"); |
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break; |
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} |
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/* |
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* Invalid length or offset probably means data area is invalid, but |
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* we have little choice but to ignore the data area in this case. |
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*/ |
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if (*off > 4096) { |
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ksmbd_debug(SMB, "offset %d too large, data area ignored\n", |
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*off); |
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*len = 0; |
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*off = 0; |
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} else if (*off < 0) { |
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ksmbd_debug(SMB, |
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"negative offset %d to data invalid ignore data area\n", |
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*off); |
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*off = 0; |
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*len = 0; |
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} else if (*len < 0) { |
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ksmbd_debug(SMB, |
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"negative data length %d invalid, data area ignored\n", |
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*len); |
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*len = 0; |
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} else if (*len > 128 * 1024) { |
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ksmbd_debug(SMB, "data area larger than 128K: %d\n", *len); |
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*len = 0; |
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} |
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/* return pointer to beginning of data area, ie offset from SMB start */ |
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if ((*off != 0) && (*len != 0)) |
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return (char *)hdr + *off; |
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else |
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return NULL; |
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} |
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/* |
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* Calculate the size of the SMB message based on the fixed header |
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* portion, the number of word parameters and the data portion of the message. |
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*/ |
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static unsigned int smb2_calc_size(void *buf) |
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{ |
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struct smb2_pdu *pdu = (struct smb2_pdu *)buf; |
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struct smb2_hdr *hdr = &pdu->hdr; |
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int offset; /* the offset from the beginning of SMB to data area */ |
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int data_length; /* the length of the variable length data area */ |
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/* Structure Size has already been checked to make sure it is 64 */ |
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int len = le16_to_cpu(hdr->StructureSize); |
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/* |
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* StructureSize2, ie length of fixed parameter area has already |
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* been checked to make sure it is the correct length. |
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*/ |
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len += le16_to_cpu(pdu->StructureSize2); |
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if (has_smb2_data_area[le16_to_cpu(hdr->Command)] == false) |
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goto calc_size_exit; |
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smb2_get_data_area_len(&offset, &data_length, hdr); |
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ksmbd_debug(SMB, "SMB2 data length %d offset %d\n", data_length, |
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offset); |
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if (data_length > 0) { |
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/* |
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* Check to make sure that data area begins after fixed area, |
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* Note that last byte of the fixed area is part of data area |
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* for some commands, typically those with odd StructureSize, |
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* so we must add one to the calculation. |
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*/ |
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if (offset + 1 < len) |
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ksmbd_debug(SMB, |
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"data area offset %d overlaps SMB2 header %d\n", |
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offset + 1, len); |
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else |
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len = offset + data_length; |
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} |
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calc_size_exit: |
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ksmbd_debug(SMB, "SMB2 len %d\n", len); |
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return len; |
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} |
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static inline int smb2_query_info_req_len(struct smb2_query_info_req *h) |
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{ |
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return le32_to_cpu(h->InputBufferLength) + |
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le32_to_cpu(h->OutputBufferLength); |
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} |
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static inline int smb2_set_info_req_len(struct smb2_set_info_req *h) |
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{ |
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return le32_to_cpu(h->BufferLength); |
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} |
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static inline int smb2_read_req_len(struct smb2_read_req *h) |
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{ |
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return le32_to_cpu(h->Length); |
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} |
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static inline int smb2_write_req_len(struct smb2_write_req *h) |
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{ |
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return le32_to_cpu(h->Length); |
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} |
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static inline int smb2_query_dir_req_len(struct smb2_query_directory_req *h) |
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{ |
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return le32_to_cpu(h->OutputBufferLength); |
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} |
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static inline int smb2_ioctl_req_len(struct smb2_ioctl_req *h) |
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{ |
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return le32_to_cpu(h->InputCount) + |
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le32_to_cpu(h->OutputCount); |
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} |
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static inline int smb2_ioctl_resp_len(struct smb2_ioctl_req *h) |
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{ |
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return le32_to_cpu(h->MaxInputResponse) + |
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le32_to_cpu(h->MaxOutputResponse); |
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} |
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static int smb2_validate_credit_charge(struct smb2_hdr *hdr) |
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{ |
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int req_len = 0, expect_resp_len = 0, calc_credit_num, max_len; |
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int credit_charge = le16_to_cpu(hdr->CreditCharge); |
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void *__hdr = hdr; |
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switch (hdr->Command) { |
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case SMB2_QUERY_INFO: |
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req_len = smb2_query_info_req_len(__hdr); |
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break; |
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case SMB2_SET_INFO: |
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req_len = smb2_set_info_req_len(__hdr); |
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break; |
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case SMB2_READ: |
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req_len = smb2_read_req_len(__hdr); |
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break; |
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case SMB2_WRITE: |
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req_len = smb2_write_req_len(__hdr); |
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break; |
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case SMB2_QUERY_DIRECTORY: |
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req_len = smb2_query_dir_req_len(__hdr); |
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break; |
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case SMB2_IOCTL: |
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req_len = smb2_ioctl_req_len(__hdr); |
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expect_resp_len = smb2_ioctl_resp_len(__hdr); |
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break; |
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default: |
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return 0; |
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} |
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credit_charge = max(1, credit_charge); |
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max_len = max(req_len, expect_resp_len); |
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calc_credit_num = DIV_ROUND_UP(max_len, SMB2_MAX_BUFFER_SIZE); |
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if (credit_charge < calc_credit_num) { |
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pr_err("Insufficient credit charge, given: %d, needed: %d\n", |
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credit_charge, calc_credit_num); |
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return 1; |
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} |
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return 0; |
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} |
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int ksmbd_smb2_check_message(struct ksmbd_work *work) |
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{ |
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struct smb2_pdu *pdu = work->request_buf; |
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struct smb2_hdr *hdr = &pdu->hdr; |
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int command; |
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__u32 clc_len; /* calculated length */ |
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__u32 len = get_rfc1002_len(pdu); |
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if (work->next_smb2_rcv_hdr_off) { |
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pdu = ksmbd_req_buf_next(work); |
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hdr = &pdu->hdr; |
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} |
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if (le32_to_cpu(hdr->NextCommand) > 0) { |
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len = le32_to_cpu(hdr->NextCommand); |
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} else if (work->next_smb2_rcv_hdr_off) { |
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len -= work->next_smb2_rcv_hdr_off; |
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len = round_up(len, 8); |
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} |
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if (check_smb2_hdr(hdr)) |
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return 1; |
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if (hdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) { |
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ksmbd_debug(SMB, "Illegal structure size %u\n", |
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le16_to_cpu(hdr->StructureSize)); |
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return 1; |
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} |
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command = le16_to_cpu(hdr->Command); |
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if (command >= NUMBER_OF_SMB2_COMMANDS) { |
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ksmbd_debug(SMB, "Illegal SMB2 command %d\n", command); |
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return 1; |
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} |
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if (smb2_req_struct_sizes[command] != pdu->StructureSize2) { |
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if (command != SMB2_OPLOCK_BREAK_HE && |
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(hdr->Status == 0 || pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2_LE)) { |
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/* error packets have 9 byte structure size */ |
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ksmbd_debug(SMB, |
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"Illegal request size %u for command %d\n", |
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le16_to_cpu(pdu->StructureSize2), command); |
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return 1; |
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} else if (command == SMB2_OPLOCK_BREAK_HE && |
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hdr->Status == 0 && |
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le16_to_cpu(pdu->StructureSize2) != OP_BREAK_STRUCT_SIZE_20 && |
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le16_to_cpu(pdu->StructureSize2) != OP_BREAK_STRUCT_SIZE_21) { |
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/* special case for SMB2.1 lease break message */ |
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ksmbd_debug(SMB, |
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"Illegal request size %d for oplock break\n", |
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le16_to_cpu(pdu->StructureSize2)); |
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return 1; |
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} |
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} |
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if ((work->conn->vals->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU) && |
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smb2_validate_credit_charge(hdr)) { |
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work->conn->ops->set_rsp_status(work, STATUS_INVALID_PARAMETER); |
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return 1; |
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} |
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clc_len = smb2_calc_size(hdr); |
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if (len != clc_len) { |
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/* server can return one byte more due to implied bcc[0] */ |
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if (clc_len == len + 1) |
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return 0; |
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/* |
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* Some windows servers (win2016) will pad also the final |
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* PDU in a compound to 8 bytes. |
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*/ |
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if (ALIGN(clc_len, 8) == len) |
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return 0; |
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/* |
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* windows client also pad up to 8 bytes when compounding. |
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* If pad is longer than eight bytes, log the server behavior |
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* (once), since may indicate a problem but allow it and |
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* continue since the frame is parseable. |
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*/ |
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if (clc_len < len) { |
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ksmbd_debug(SMB, |
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"cli req padded more than expected. Length %d not %d for cmd:%d mid:%llu\n", |
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len, clc_len, command, |
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le64_to_cpu(hdr->MessageId)); |
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return 0; |
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} |
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if (command == SMB2_LOCK_HE && len == 88) |
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return 0; |
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ksmbd_debug(SMB, |
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"cli req too short, len %d not %d. cmd:%d mid:%llu\n", |
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len, clc_len, command, |
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le64_to_cpu(hdr->MessageId)); |
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return 1; |
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} |
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return 0; |
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} |
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int smb2_negotiate_request(struct ksmbd_work *work) |
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{ |
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return ksmbd_smb_negotiate_common(work, SMB2_NEGOTIATE_HE); |
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}
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