| // SPDX-License-Identifier: LGPL-2.1 |
| /* |
| * |
| * Copyright (C) International Business Machines Corp., 2002,2011 |
| * Etersoft, 2012 |
| * Author(s): Steve French (sfrench@us.ibm.com) |
| * Pavel Shilovsky (pshilovsky@samba.org) 2012 |
| * |
| */ |
| #include <linux/ctype.h> |
| #include "smb2pdu.h" |
| #include "cifsglob.h" |
| #include "cifsproto.h" |
| #include "smb2proto.h" |
| #include "cifs_debug.h" |
| #include "cifs_unicode.h" |
| #include "smb2status.h" |
| #include "smb2glob.h" |
| #include "nterr.h" |
| |
| static int |
| check_smb2_hdr(struct smb2_sync_hdr *shdr, __u64 mid) |
| { |
| __u64 wire_mid = le64_to_cpu(shdr->MessageId); |
| |
| /* |
| * Make sure that this really is an SMB, that it is a response, |
| * and that the message ids match. |
| */ |
| if ((shdr->ProtocolId == SMB2_PROTO_NUMBER) && |
| (mid == wire_mid)) { |
| if (shdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR) |
| return 0; |
| else { |
| /* only one valid case where server sends us request */ |
| if (shdr->Command == SMB2_OPLOCK_BREAK) |
| return 0; |
| else |
| cifs_dbg(VFS, "Received Request not response\n"); |
| } |
| } else { /* bad signature or mid */ |
| if (shdr->ProtocolId != SMB2_PROTO_NUMBER) |
| cifs_dbg(VFS, "Bad protocol string signature header %x\n", |
| le32_to_cpu(shdr->ProtocolId)); |
| if (mid != wire_mid) |
| cifs_dbg(VFS, "Mids do not match: %llu and %llu\n", |
| mid, wire_mid); |
| } |
| cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", wire_mid); |
| return 1; |
| } |
| |
| /* |
| * The following table defines the expected "StructureSize" of SMB2 responses |
| * in order by SMB2 command. This is similar to "wct" in SMB/CIFS responses. |
| * |
| * Note that commands are defined in smb2pdu.h in le16 but the array below is |
| * indexed by command in host byte order |
| */ |
| static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = { |
| /* SMB2_NEGOTIATE */ cpu_to_le16(65), |
| /* SMB2_SESSION_SETUP */ cpu_to_le16(9), |
| /* SMB2_LOGOFF */ cpu_to_le16(4), |
| /* SMB2_TREE_CONNECT */ cpu_to_le16(16), |
| /* SMB2_TREE_DISCONNECT */ cpu_to_le16(4), |
| /* SMB2_CREATE */ cpu_to_le16(89), |
| /* SMB2_CLOSE */ cpu_to_le16(60), |
| /* SMB2_FLUSH */ cpu_to_le16(4), |
| /* SMB2_READ */ cpu_to_le16(17), |
| /* SMB2_WRITE */ cpu_to_le16(17), |
| /* SMB2_LOCK */ cpu_to_le16(4), |
| /* SMB2_IOCTL */ cpu_to_le16(49), |
| /* BB CHECK this ... not listed in documentation */ |
| /* SMB2_CANCEL */ cpu_to_le16(0), |
| /* SMB2_ECHO */ cpu_to_le16(4), |
| /* SMB2_QUERY_DIRECTORY */ cpu_to_le16(9), |
| /* SMB2_CHANGE_NOTIFY */ cpu_to_le16(9), |
| /* SMB2_QUERY_INFO */ cpu_to_le16(9), |
| /* SMB2_SET_INFO */ cpu_to_le16(2), |
| /* BB FIXME can also be 44 for lease break */ |
| /* SMB2_OPLOCK_BREAK */ cpu_to_le16(24) |
| }; |
| |
| #define SMB311_NEGPROT_BASE_SIZE (sizeof(struct smb2_sync_hdr) + sizeof(struct smb2_negotiate_rsp)) |
| |
| static __u32 get_neg_ctxt_len(struct smb2_sync_hdr *hdr, __u32 len, |
| __u32 non_ctxlen) |
| { |
| __u16 neg_count; |
| __u32 nc_offset, size_of_pad_before_neg_ctxts; |
| struct smb2_negotiate_rsp *pneg_rsp = (struct smb2_negotiate_rsp *)hdr; |
| |
| /* Negotiate contexts are only valid for latest dialect SMB3.11 */ |
| neg_count = le16_to_cpu(pneg_rsp->NegotiateContextCount); |
| if ((neg_count == 0) || |
| (pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID))) |
| return 0; |
| |
| /* |
| * if SPNEGO blob present (ie the RFC2478 GSS info which indicates |
| * which security mechanisms the server supports) make sure that |
| * the negotiate contexts start after it |
| */ |
| nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset); |
| /* |
| * non_ctxlen is at least shdr->StructureSize + pdu->StructureSize2 |
| * and the latter is 1 byte bigger than the fix-sized area of the |
| * NEGOTIATE response |
| */ |
| if (nc_offset + 1 < non_ctxlen) { |
| pr_warn_once("Invalid negotiate context offset %d\n", nc_offset); |
| return 0; |
| } else if (nc_offset + 1 == non_ctxlen) { |
| cifs_dbg(FYI, "no SPNEGO security blob in negprot rsp\n"); |
| size_of_pad_before_neg_ctxts = 0; |
| } else if (non_ctxlen == SMB311_NEGPROT_BASE_SIZE) |
| /* has padding, but no SPNEGO blob */ |
| size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen + 1; |
| else |
| size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen; |
| |
| /* Verify that at least minimal negotiate contexts fit within frame */ |
| if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) { |
| pr_warn_once("negotiate context goes beyond end\n"); |
| return 0; |
| } |
| |
| cifs_dbg(FYI, "length of negcontexts %d pad %d\n", |
| len - nc_offset, size_of_pad_before_neg_ctxts); |
| |
| /* length of negcontexts including pad from end of sec blob to them */ |
| return (len - nc_offset) + size_of_pad_before_neg_ctxts; |
| } |
| |
| int |
| smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr) |
| { |
| struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf; |
| struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)shdr; |
| __u64 mid; |
| __u32 clc_len; /* calculated length */ |
| int command; |
| int pdu_size = sizeof(struct smb2_sync_pdu); |
| int hdr_size = sizeof(struct smb2_sync_hdr); |
| |
| /* |
| * Add function to do table lookup of StructureSize by command |
| * ie Validate the wct via smb2_struct_sizes table above |
| */ |
| if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) { |
| struct smb2_transform_hdr *thdr = |
| (struct smb2_transform_hdr *)buf; |
| struct cifs_ses *ses = NULL; |
| |
| /* decrypt frame now that it is completely read in */ |
| spin_lock(&cifs_tcp_ses_lock); |
| list_for_each_entry(ses, &srvr->smb_ses_list, smb_ses_list) { |
| if (ses->Suid == thdr->SessionId) |
| break; |
| } |
| spin_unlock(&cifs_tcp_ses_lock); |
| if (list_entry_is_head(ses, &srvr->smb_ses_list, |
| smb_ses_list)) { |
| cifs_dbg(VFS, "no decryption - session id not found\n"); |
| return 1; |
| } |
| } |
| |
| mid = le64_to_cpu(shdr->MessageId); |
| if (len < pdu_size) { |
| if ((len >= hdr_size) |
| && (shdr->Status != 0)) { |
| pdu->StructureSize2 = 0; |
| /* |
| * As with SMB/CIFS, on some error cases servers may |
| * not return wct properly |
| */ |
| return 0; |
| } else { |
| cifs_dbg(VFS, "Length less than SMB header size\n"); |
| } |
| return 1; |
| } |
| if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) { |
| cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n", |
| mid); |
| return 1; |
| } |
| |
| if (check_smb2_hdr(shdr, mid)) |
| return 1; |
| |
| if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) { |
| cifs_dbg(VFS, "Invalid structure size %u\n", |
| le16_to_cpu(shdr->StructureSize)); |
| return 1; |
| } |
| |
| command = le16_to_cpu(shdr->Command); |
| if (command >= NUMBER_OF_SMB2_COMMANDS) { |
| cifs_dbg(VFS, "Invalid SMB2 command %d\n", command); |
| return 1; |
| } |
| |
| if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) { |
| if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 || |
| pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) { |
| /* error packets have 9 byte structure size */ |
| cifs_dbg(VFS, "Invalid response size %u for command %d\n", |
| le16_to_cpu(pdu->StructureSize2), command); |
| return 1; |
| } else if (command == SMB2_OPLOCK_BREAK_HE |
| && (shdr->Status == 0) |
| && (le16_to_cpu(pdu->StructureSize2) != 44) |
| && (le16_to_cpu(pdu->StructureSize2) != 36)) { |
| /* special case for SMB2.1 lease break message */ |
| cifs_dbg(VFS, "Invalid response size %d for oplock break\n", |
| le16_to_cpu(pdu->StructureSize2)); |
| return 1; |
| } |
| } |
| |
| clc_len = smb2_calc_size(buf, srvr); |
| |
| if (shdr->Command == SMB2_NEGOTIATE) |
| clc_len += get_neg_ctxt_len(shdr, len, clc_len); |
| |
| if (len != clc_len) { |
| cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n", |
| clc_len, len, mid); |
| /* create failed on symlink */ |
| if (command == SMB2_CREATE_HE && |
| shdr->Status == STATUS_STOPPED_ON_SYMLINK) |
| return 0; |
| /* Windows 7 server returns 24 bytes more */ |
| if (clc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE) |
| return 0; |
| /* server can return one byte more due to implied bcc[0] */ |
| if (clc_len == len + 1) |
| return 0; |
| |
| /* |
| * Some windows servers (win2016) will pad also the final |
| * PDU in a compound to 8 bytes. |
| */ |
| if (((clc_len + 7) & ~7) == len) |
| return 0; |
| |
| /* |
| * MacOS server pads after SMB2.1 write response with 3 bytes |
| * of junk. Other servers match RFC1001 len to actual |
| * SMB2/SMB3 frame length (header + smb2 response specific data) |
| * Some windows servers also pad up to 8 bytes when compounding. |
| */ |
| if (clc_len < len) |
| return 0; |
| |
| pr_warn_once( |
| "srv rsp too short, len %d not %d. cmd:%d mid:%llu\n", |
| len, clc_len, command, mid); |
| |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* |
| * The size of the variable area depends on the offset and length fields |
| * located in different fields for various SMB2 responses. SMB2 responses |
| * with no variable length info, show an offset of zero for the offset field. |
| */ |
| static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = { |
| /* SMB2_NEGOTIATE */ true, |
| /* SMB2_SESSION_SETUP */ true, |
| /* SMB2_LOGOFF */ false, |
| /* SMB2_TREE_CONNECT */ false, |
| /* SMB2_TREE_DISCONNECT */ false, |
| /* SMB2_CREATE */ true, |
| /* SMB2_CLOSE */ false, |
| /* SMB2_FLUSH */ false, |
| /* SMB2_READ */ true, |
| /* SMB2_WRITE */ false, |
| /* SMB2_LOCK */ false, |
| /* SMB2_IOCTL */ true, |
| /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */ |
| /* SMB2_ECHO */ false, |
| /* SMB2_QUERY_DIRECTORY */ true, |
| /* SMB2_CHANGE_NOTIFY */ true, |
| /* SMB2_QUERY_INFO */ true, |
| /* SMB2_SET_INFO */ false, |
| /* SMB2_OPLOCK_BREAK */ false |
| }; |
| |
| /* |
| * Returns the pointer to the beginning of the data area. Length of the data |
| * area and the offset to it (from the beginning of the smb are also returned. |
| */ |
| char * |
| smb2_get_data_area_len(int *off, int *len, struct smb2_sync_hdr *shdr) |
| { |
| *off = 0; |
| *len = 0; |
| |
| /* error responses do not have data area */ |
| if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED && |
| (((struct smb2_err_rsp *)shdr)->StructureSize) == |
| SMB2_ERROR_STRUCTURE_SIZE2) |
| return NULL; |
| |
| /* |
| * Following commands have data areas so we have to get the location |
| * of the data buffer offset and data buffer length for the particular |
| * command. |
| */ |
| switch (shdr->Command) { |
| case SMB2_NEGOTIATE: |
| *off = le16_to_cpu( |
| ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset); |
| *len = le16_to_cpu( |
| ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength); |
| break; |
| case SMB2_SESSION_SETUP: |
| *off = le16_to_cpu( |
| ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset); |
| *len = le16_to_cpu( |
| ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength); |
| break; |
| case SMB2_CREATE: |
| *off = le32_to_cpu( |
| ((struct smb2_create_rsp *)shdr)->CreateContextsOffset); |
| *len = le32_to_cpu( |
| ((struct smb2_create_rsp *)shdr)->CreateContextsLength); |
| break; |
| case SMB2_QUERY_INFO: |
| *off = le16_to_cpu( |
| ((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset); |
| *len = le32_to_cpu( |
| ((struct smb2_query_info_rsp *)shdr)->OutputBufferLength); |
| break; |
| case SMB2_READ: |
| /* TODO: is this a bug ? */ |
| *off = ((struct smb2_read_rsp *)shdr)->DataOffset; |
| *len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength); |
| break; |
| case SMB2_QUERY_DIRECTORY: |
| *off = le16_to_cpu( |
| ((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset); |
| *len = le32_to_cpu( |
| ((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength); |
| break; |
| case SMB2_IOCTL: |
| *off = le32_to_cpu( |
| ((struct smb2_ioctl_rsp *)shdr)->OutputOffset); |
| *len = le32_to_cpu( |
| ((struct smb2_ioctl_rsp *)shdr)->OutputCount); |
| break; |
| case SMB2_CHANGE_NOTIFY: |
| *off = le16_to_cpu( |
| ((struct smb2_change_notify_rsp *)shdr)->OutputBufferOffset); |
| *len = le32_to_cpu( |
| ((struct smb2_change_notify_rsp *)shdr)->OutputBufferLength); |
| break; |
| default: |
| cifs_dbg(VFS, "no length check for command %d\n", le16_to_cpu(shdr->Command)); |
| break; |
| } |
| |
| /* |
| * Invalid length or offset probably means data area is invalid, but |
| * we have little choice but to ignore the data area in this case. |
| */ |
| if (*off > 4096) { |
| cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off); |
| *len = 0; |
| *off = 0; |
| } else if (*off < 0) { |
| cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n", |
| *off); |
| *off = 0; |
| *len = 0; |
| } else if (*len < 0) { |
| cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n", |
| *len); |
| *len = 0; |
| } else if (*len > 128 * 1024) { |
| cifs_dbg(VFS, "data area larger than 128K: %d\n", *len); |
| *len = 0; |
| } |
| |
| /* return pointer to beginning of data area, ie offset from SMB start */ |
| if ((*off != 0) && (*len != 0)) |
| return (char *)shdr + *off; |
| else |
| return NULL; |
| } |
| |
| /* |
| * Calculate the size of the SMB message based on the fixed header |
| * portion, the number of word parameters and the data portion of the message. |
| */ |
| unsigned int |
| smb2_calc_size(void *buf, struct TCP_Server_Info *srvr) |
| { |
| struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)buf; |
| struct smb2_sync_hdr *shdr = &pdu->sync_hdr; |
| int offset; /* the offset from the beginning of SMB to data area */ |
| int data_length; /* the length of the variable length data area */ |
| /* Structure Size has already been checked to make sure it is 64 */ |
| int len = le16_to_cpu(shdr->StructureSize); |
| |
| /* |
| * StructureSize2, ie length of fixed parameter area has already |
| * been checked to make sure it is the correct length. |
| */ |
| len += le16_to_cpu(pdu->StructureSize2); |
| |
| if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false) |
| goto calc_size_exit; |
| |
| smb2_get_data_area_len(&offset, &data_length, shdr); |
| cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset); |
| |
| if (data_length > 0) { |
| /* |
| * Check to make sure that data area begins after fixed area, |
| * Note that last byte of the fixed area is part of data area |
| * for some commands, typically those with odd StructureSize, |
| * so we must add one to the calculation. |
| */ |
| if (offset + 1 < len) { |
| cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n", |
| offset + 1, len); |
| data_length = 0; |
| } else { |
| len = offset + data_length; |
| } |
| } |
| calc_size_exit: |
| cifs_dbg(FYI, "SMB2 len %d\n", 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; |
| int map_type; |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR) |
| map_type = SFM_MAP_UNI_RSVD; |
| else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) |
| map_type = SFU_MAP_UNI_RSVD; |
| else |
| map_type = NO_MAP_UNI_RSVD; |
| |
| /* Windows doesn't allow paths beginning with \ */ |
| if (from[0] == '\\') |
| start_of_path = from + 1; |
| |
| /* SMB311 POSIX extensions paths do not include leading slash */ |
| else if (cifs_sb_master_tlink(cifs_sb) && |
| cifs_sb_master_tcon(cifs_sb)->posix_extensions && |
| (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, map_type); |
| return to; |
| } |
| |
| __le32 |
| smb2_get_lease_state(struct cifsInodeInfo *cinode) |
| { |
| __le32 lease = 0; |
| |
| if (CIFS_CACHE_WRITE(cinode)) |
| lease |= SMB2_LEASE_WRITE_CACHING; |
| if (CIFS_CACHE_HANDLE(cinode)) |
| lease |= SMB2_LEASE_HANDLE_CACHING; |
| if (CIFS_CACHE_READ(cinode)) |
| lease |= SMB2_LEASE_READ_CACHING; |
| return lease; |
| } |
| |
| struct smb2_lease_break_work { |
| struct work_struct lease_break; |
| struct tcon_link *tlink; |
| __u8 lease_key[16]; |
| __le32 lease_state; |
| }; |
| |
| static void |
| cifs_ses_oplock_break(struct work_struct *work) |
| { |
| struct smb2_lease_break_work *lw = container_of(work, |
| struct smb2_lease_break_work, lease_break); |
| int rc = 0; |
| |
| rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key, |
| lw->lease_state); |
| |
| cifs_dbg(FYI, "Lease release rc %d\n", rc); |
| cifs_put_tlink(lw->tlink); |
| kfree(lw); |
| } |
| |
| static void |
| smb2_queue_pending_open_break(struct tcon_link *tlink, __u8 *lease_key, |
| __le32 new_lease_state) |
| { |
| struct smb2_lease_break_work *lw; |
| |
| lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL); |
| if (!lw) { |
| cifs_put_tlink(tlink); |
| return; |
| } |
| |
| INIT_WORK(&lw->lease_break, cifs_ses_oplock_break); |
| lw->tlink = tlink; |
| lw->lease_state = new_lease_state; |
| memcpy(lw->lease_key, lease_key, SMB2_LEASE_KEY_SIZE); |
| queue_work(cifsiod_wq, &lw->lease_break); |
| } |
| |
| static bool |
| smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp) |
| { |
| __u8 lease_state; |
| struct cifsFileInfo *cfile; |
| struct cifsInodeInfo *cinode; |
| int ack_req = le32_to_cpu(rsp->Flags & |
| SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED); |
| |
| lease_state = le32_to_cpu(rsp->NewLeaseState); |
| |
| list_for_each_entry(cfile, &tcon->openFileList, tlist) { |
| cinode = CIFS_I(d_inode(cfile->dentry)); |
| |
| if (memcmp(cinode->lease_key, rsp->LeaseKey, |
| SMB2_LEASE_KEY_SIZE)) |
| continue; |
| |
| cifs_dbg(FYI, "found in the open list\n"); |
| cifs_dbg(FYI, "lease key match, lease break 0x%x\n", |
| lease_state); |
| |
| if (ack_req) |
| cfile->oplock_break_cancelled = false; |
| else |
| cfile->oplock_break_cancelled = true; |
| |
| set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags); |
| |
| cfile->oplock_epoch = le16_to_cpu(rsp->Epoch); |
| cfile->oplock_level = lease_state; |
| |
| cifs_queue_oplock_break(cfile); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static struct cifs_pending_open * |
| smb2_tcon_find_pending_open_lease(struct cifs_tcon *tcon, |
| struct smb2_lease_break *rsp) |
| { |
| __u8 lease_state = le32_to_cpu(rsp->NewLeaseState); |
| int ack_req = le32_to_cpu(rsp->Flags & |
| SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED); |
| struct cifs_pending_open *open; |
| struct cifs_pending_open *found = NULL; |
| |
| list_for_each_entry(open, &tcon->pending_opens, olist) { |
| if (memcmp(open->lease_key, rsp->LeaseKey, |
| SMB2_LEASE_KEY_SIZE)) |
| continue; |
| |
| if (!found && ack_req) { |
| found = open; |
| } |
| |
| cifs_dbg(FYI, "found in the pending open list\n"); |
| cifs_dbg(FYI, "lease key match, lease break 0x%x\n", |
| lease_state); |
| |
| open->oplock = lease_state; |
| } |
| |
| return found; |
| } |
| |
| static bool |
| smb2_is_valid_lease_break(char *buffer) |
| { |
| struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer; |
| struct TCP_Server_Info *server; |
| struct cifs_ses *ses; |
| struct cifs_tcon *tcon; |
| struct cifs_pending_open *open; |
| |
| cifs_dbg(FYI, "Checking for lease break\n"); |
| |
| /* look up tcon based on tid & uid */ |
| spin_lock(&cifs_tcp_ses_lock); |
| list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) { |
| list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { |
| list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { |
| spin_lock(&tcon->open_file_lock); |
| cifs_stats_inc( |
| &tcon->stats.cifs_stats.num_oplock_brks); |
| if (smb2_tcon_has_lease(tcon, rsp)) { |
| spin_unlock(&tcon->open_file_lock); |
| spin_unlock(&cifs_tcp_ses_lock); |
| return true; |
| } |
| open = smb2_tcon_find_pending_open_lease(tcon, |
| rsp); |
| if (open) { |
| __u8 lease_key[SMB2_LEASE_KEY_SIZE]; |
| struct tcon_link *tlink; |
| |
| tlink = cifs_get_tlink(open->tlink); |
| memcpy(lease_key, open->lease_key, |
| SMB2_LEASE_KEY_SIZE); |
| spin_unlock(&tcon->open_file_lock); |
| spin_unlock(&cifs_tcp_ses_lock); |
| smb2_queue_pending_open_break(tlink, |
| lease_key, |
| rsp->NewLeaseState); |
| return true; |
| } |
| spin_unlock(&tcon->open_file_lock); |
| |
| if (tcon->crfid.is_valid && |
| !memcmp(rsp->LeaseKey, |
| tcon->crfid.fid->lease_key, |
| SMB2_LEASE_KEY_SIZE)) { |
| tcon->crfid.time = 0; |
| INIT_WORK(&tcon->crfid.lease_break, |
| smb2_cached_lease_break); |
| queue_work(cifsiod_wq, |
| &tcon->crfid.lease_break); |
| spin_unlock(&cifs_tcp_ses_lock); |
| return true; |
| } |
| } |
| } |
| } |
| spin_unlock(&cifs_tcp_ses_lock); |
| cifs_dbg(FYI, "Can not process lease break - no lease matched\n"); |
| return false; |
| } |
| |
| bool |
| smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server) |
| { |
| struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer; |
| struct cifs_ses *ses; |
| struct cifs_tcon *tcon; |
| struct cifsInodeInfo *cinode; |
| struct cifsFileInfo *cfile; |
| |
| cifs_dbg(FYI, "Checking for oplock break\n"); |
| |
| if (rsp->sync_hdr.Command != SMB2_OPLOCK_BREAK) |
| return false; |
| |
| if (rsp->StructureSize != |
| smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) { |
| if (le16_to_cpu(rsp->StructureSize) == 44) |
| return smb2_is_valid_lease_break(buffer); |
| else |
| return false; |
| } |
| |
| cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel); |
| |
| /* look up tcon based on tid & uid */ |
| spin_lock(&cifs_tcp_ses_lock); |
| list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { |
| list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { |
| |
| spin_lock(&tcon->open_file_lock); |
| list_for_each_entry(cfile, &tcon->openFileList, tlist) { |
| if (rsp->PersistentFid != |
| cfile->fid.persistent_fid || |
| rsp->VolatileFid != |
| cfile->fid.volatile_fid) |
| continue; |
| |
| cifs_dbg(FYI, "file id match, oplock break\n"); |
| cifs_stats_inc( |
| &tcon->stats.cifs_stats.num_oplock_brks); |
| cinode = CIFS_I(d_inode(cfile->dentry)); |
| spin_lock(&cfile->file_info_lock); |
| if (!CIFS_CACHE_WRITE(cinode) && |
| rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE) |
| cfile->oplock_break_cancelled = true; |
| else |
| cfile->oplock_break_cancelled = false; |
| |
| set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, |
| &cinode->flags); |
| |
| cfile->oplock_epoch = 0; |
| cfile->oplock_level = rsp->OplockLevel; |
| |
| spin_unlock(&cfile->file_info_lock); |
| |
| cifs_queue_oplock_break(cfile); |
| |
| spin_unlock(&tcon->open_file_lock); |
| spin_unlock(&cifs_tcp_ses_lock); |
| return true; |
| } |
| spin_unlock(&tcon->open_file_lock); |
| } |
| } |
| spin_unlock(&cifs_tcp_ses_lock); |
| cifs_dbg(FYI, "No file id matched, oplock break ignored\n"); |
| return true; |
| } |
| |
| void |
| smb2_cancelled_close_fid(struct work_struct *work) |
| { |
| struct close_cancelled_open *cancelled = container_of(work, |
| struct close_cancelled_open, work); |
| struct cifs_tcon *tcon = cancelled->tcon; |
| int rc; |
| |
| if (cancelled->mid) |
| cifs_tcon_dbg(VFS, "Close unmatched open for MID:%llu\n", |
| cancelled->mid); |
| else |
| cifs_tcon_dbg(VFS, "Close interrupted close\n"); |
| |
| rc = SMB2_close(0, tcon, cancelled->fid.persistent_fid, |
| cancelled->fid.volatile_fid); |
| if (rc) |
| cifs_tcon_dbg(VFS, "Close cancelled mid failed rc:%d\n", rc); |
| |
| cifs_put_tcon(tcon); |
| kfree(cancelled); |
| } |
| |
| /* |
| * Caller should already has an extra reference to @tcon |
| * This function is used to queue work to close a handle to prevent leaks |
| * on the server. |
| * We handle two cases. If an open was interrupted after we sent the |
| * SMB2_CREATE to the server but before we processed the reply, and second |
| * if a close was interrupted before we sent the SMB2_CLOSE to the server. |
| */ |
| static int |
| __smb2_handle_cancelled_cmd(struct cifs_tcon *tcon, __u16 cmd, __u64 mid, |
| __u64 persistent_fid, __u64 volatile_fid) |
| { |
| struct close_cancelled_open *cancelled; |
| |
| cancelled = kzalloc(sizeof(*cancelled), GFP_ATOMIC); |
| if (!cancelled) |
| return -ENOMEM; |
| |
| cancelled->fid.persistent_fid = persistent_fid; |
| cancelled->fid.volatile_fid = volatile_fid; |
| cancelled->tcon = tcon; |
| cancelled->cmd = cmd; |
| cancelled->mid = mid; |
| INIT_WORK(&cancelled->work, smb2_cancelled_close_fid); |
| WARN_ON(queue_work(cifsiod_wq, &cancelled->work) == false); |
| |
| return 0; |
| } |
| |
| int |
| smb2_handle_cancelled_close(struct cifs_tcon *tcon, __u64 persistent_fid, |
| __u64 volatile_fid) |
| { |
| int rc; |
| |
| cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count); |
| spin_lock(&cifs_tcp_ses_lock); |
| if (tcon->tc_count <= 0) { |
| struct TCP_Server_Info *server = NULL; |
| |
| WARN_ONCE(tcon->tc_count < 0, "tcon refcount is negative"); |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| if (tcon->ses) |
| server = tcon->ses->server; |
| |
| cifs_server_dbg(FYI, "tid=%u: tcon is closing, skipping async close retry of fid %llu %llu\n", |
| tcon->tid, persistent_fid, volatile_fid); |
| |
| return 0; |
| } |
| tcon->tc_count++; |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| rc = __smb2_handle_cancelled_cmd(tcon, SMB2_CLOSE_HE, 0, |
| persistent_fid, volatile_fid); |
| if (rc) |
| cifs_put_tcon(tcon); |
| |
| return rc; |
| } |
| |
| int |
| smb2_handle_cancelled_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
| { |
| struct smb2_sync_hdr *sync_hdr = mid->resp_buf; |
| struct smb2_create_rsp *rsp = mid->resp_buf; |
| struct cifs_tcon *tcon; |
| int rc; |
| |
| if ((mid->optype & CIFS_CP_CREATE_CLOSE_OP) || sync_hdr->Command != SMB2_CREATE || |
| sync_hdr->Status != STATUS_SUCCESS) |
| return 0; |
| |
| tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId, |
| sync_hdr->TreeId); |
| if (!tcon) |
| return -ENOENT; |
| |
| rc = __smb2_handle_cancelled_cmd(tcon, |
| le16_to_cpu(sync_hdr->Command), |
| le64_to_cpu(sync_hdr->MessageId), |
| rsp->PersistentFileId, |
| rsp->VolatileFileId); |
| if (rc) |
| cifs_put_tcon(tcon); |
| |
| return rc; |
| } |
| |
| /** |
| * smb311_update_preauth_hash - update @ses hash with the packet data in @iov |
| * |
| * Assumes @iov does not contain the rfc1002 length and iov[0] has the |
| * SMB2 header. |
| * |
| * @ses: server session structure |
| * @iov: array containing the SMB request we will send to the server |
| * @nvec: number of array entries for the iov |
| */ |
| int |
| smb311_update_preauth_hash(struct cifs_ses *ses, struct kvec *iov, int nvec) |
| { |
| int i, rc; |
| struct sdesc *d; |
| struct smb2_sync_hdr *hdr; |
| struct TCP_Server_Info *server = cifs_ses_server(ses); |
| |
| hdr = (struct smb2_sync_hdr *)iov[0].iov_base; |
| /* neg prot are always taken */ |
| if (hdr->Command == SMB2_NEGOTIATE) |
| goto ok; |
| |
| /* |
| * If we process a command which wasn't a negprot it means the |
| * neg prot was already done, so the server dialect was set |
| * and we can test it. Preauth requires 3.1.1 for now. |
| */ |
| if (server->dialect != SMB311_PROT_ID) |
| return 0; |
| |
| if (hdr->Command != SMB2_SESSION_SETUP) |
| return 0; |
| |
| /* skip last sess setup response */ |
| if ((hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR) |
| && (hdr->Status == NT_STATUS_OK |
| || (hdr->Status != |
| cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED)))) |
| return 0; |
| |
| ok: |
| rc = smb311_crypto_shash_allocate(server); |
| if (rc) |
| return rc; |
| |
| d = server->secmech.sdescsha512; |
| rc = crypto_shash_init(&d->shash); |
| if (rc) { |
| cifs_dbg(VFS, "%s: Could not init sha512 shash\n", __func__); |
| return rc; |
| } |
| |
| rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash, |
| SMB2_PREAUTH_HASH_SIZE); |
| if (rc) { |
| cifs_dbg(VFS, "%s: Could not update sha512 shash\n", __func__); |
| return rc; |
| } |
| |
| for (i = 0; i < nvec; i++) { |
| rc = crypto_shash_update(&d->shash, |
| iov[i].iov_base, iov[i].iov_len); |
| if (rc) { |
| cifs_dbg(VFS, "%s: Could not update sha512 shash\n", |
| __func__); |
| return rc; |
| } |
| } |
| |
| rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash); |
| if (rc) { |
| cifs_dbg(VFS, "%s: Could not finalize sha512 shash\n", |
| __func__); |
| return rc; |
| } |
| |
| return 0; |
| } |