1 files changed, 297 insertions, 35 deletions

diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c
index a4ff5d54755..b8021fde987 100644
--- a/fs/cifs/smb2misc.c
+++ b/fs/cifs/smb2misc.c
@@ -45,16 +45,17 @@ check_smb2_hdr(struct smb2_hdr *hdr, __u64 mid)
 			if (hdr->Command == SMB2_OPLOCK_BREAK)
 				return 0;
 			else
-				cERROR(1, "Received Request not response");
+				cifs_dbg(VFS, "Received Request not response\n");
 		}
 	} else { /* bad signature or mid */
 		if (*(__le32 *)hdr->ProtocolId != SMB2_PROTO_NUMBER)
-			cERROR(1, "Bad protocol string signature header %x",
-				  *(unsigned int *) hdr->ProtocolId);
+			cifs_dbg(VFS, "Bad protocol string signature header %x\n",
+				 *(unsigned int *) hdr->ProtocolId);
 		if (mid != hdr->MessageId)
-			cERROR(1, "Mids do not match");
+			cifs_dbg(VFS, "Mids do not match: %llu and %llu\n",
+				 mid, hdr->MessageId);
 	}
-	cERROR(1, "Bad SMB detected. The Mid=%llu", hdr->MessageId);
+	cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", hdr->MessageId);
 	return 1;
 }
 
@@ -100,14 +101,15 @@ smb2_check_message(char *buf, unsigned int length)
 	int command;
 
 	/* BB disable following printk later */
-	cFYI(1, "%s length: 0x%x, smb_buf_length: 0x%x", __func__, length, len);
+	cifs_dbg(FYI, "%s length: 0x%x, smb_buf_length: 0x%x\n",
+		 __func__, length, len);
 
 	/*
 	 * Add function to do table lookup of StructureSize by command
 	 * ie Validate the wct via smb2_struct_sizes table above
 	 */
 
-	if (length < 2 + sizeof(struct smb2_hdr)) {
+	if (length < sizeof(struct smb2_pdu)) {
 		if ((length >= sizeof(struct smb2_hdr)) && (hdr->Status != 0)) {
 			pdu->StructureSize2 = 0;
 			/*
@@ -116,53 +118,69 @@ smb2_check_message(char *buf, unsigned int length)
 			 */
 			return 0;
 		} else {
-			cERROR(1, "Length less than SMB header size");
+			cifs_dbg(VFS, "Length less than SMB header size\n");
 		}
 		return 1;
 	}
 	if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE - 4) {
-		cERROR(1, "SMB length greater than maximum, mid=%lld", mid);
+		cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
+			 mid);
 		return 1;
 	}
 
 	if (check_smb2_hdr(hdr, mid))
 		return 1;
 
-	if (hdr->StructureSize != SMB2_HEADER_SIZE) {
-		cERROR(1, "Illegal structure size %d",
-			  le16_to_cpu(hdr->StructureSize));
+	if (hdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
+		cifs_dbg(VFS, "Illegal structure size %u\n",
+			 le16_to_cpu(hdr->StructureSize));
 		return 1;
 	}
 
 	command = le16_to_cpu(hdr->Command);
 	if (command >= NUMBER_OF_SMB2_COMMANDS) {
-		cERROR(1, "Illegal SMB2 command %d", command);
+		cifs_dbg(VFS, "Illegal SMB2 command %d\n", command);
 		return 1;
 	}
 
 	if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
-		if (hdr->Status == 0 ||
-		    pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2) {
+		if (command != SMB2_OPLOCK_BREAK_HE && (hdr->Status == 0 ||
+		    pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
 			/* error packets have 9 byte structure size */
-			cERROR(1, "Illegal response size %u for command %d",
-				   le16_to_cpu(pdu->StructureSize2), command);
+			cifs_dbg(VFS, "Illegal response size %u for command %d\n",
+				 le16_to_cpu(pdu->StructureSize2), command);
+			return 1;
+		} else if (command == SMB2_OPLOCK_BREAK_HE && (hdr->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, "Illegal response size %d for oplock break\n",
+				 le16_to_cpu(pdu->StructureSize2));
 			return 1;
 		}
 	}
 
 	if (4 + len != length) {
-		cERROR(1, "Total length %u RFC1002 length %u mismatch mid %llu",
-			  length, 4 + len, mid);
+		cifs_dbg(VFS, "Total length %u RFC1002 length %u mismatch mid %llu\n",
+			 length, 4 + len, mid);
 		return 1;
 	}
 
 	clc_len = smb2_calc_size(hdr);
 
 	if (4 + len != clc_len) {
-		cFYI(1, "Calculated size %u length %u mismatch mid %llu",
-			clc_len, 4 + len, mid);
-		if (clc_len == 4 + len + 1) /* BB FIXME (fix samba) */
-			return 0; /* BB workaround Samba 3 bug SessSetup rsp */
+		cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
+			 clc_len, 4 + len, mid);
+		/* create failed on symlink */
+		if (command == SMB2_CREATE_HE &&
+		    hdr->Status == STATUS_STOPPED_ON_SYMLINK)
+			return 0;
+		/* Windows 7 server returns 24 bytes more */
+		if (clc_len + 20 == len && command == SMB2_OPLOCK_BREAK_HE)
+			return 0;
+		/* server can return one byte more */
+		if (clc_len == 4 + len + 1)
+			return 0;
 		return 1;
 	}
 	return 0;
@@ -242,12 +260,24 @@ smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
 		    ((struct smb2_query_info_rsp *)hdr)->OutputBufferLength);
 		break;
 	case SMB2_READ:
+		*off = ((struct smb2_read_rsp *)hdr)->DataOffset;
+		*len = le32_to_cpu(((struct smb2_read_rsp *)hdr)->DataLength);
+		break;
 	case SMB2_QUERY_DIRECTORY:
+		*off = le16_to_cpu(
+		  ((struct smb2_query_directory_rsp *)hdr)->OutputBufferOffset);
+		*len = le32_to_cpu(
+		  ((struct smb2_query_directory_rsp *)hdr)->OutputBufferLength);
+		break;
 	case SMB2_IOCTL:
+		*off = le32_to_cpu(
+		  ((struct smb2_ioctl_rsp *)hdr)->OutputOffset);
+		*len = le32_to_cpu(((struct smb2_ioctl_rsp *)hdr)->OutputCount);
+		break;
 	case SMB2_CHANGE_NOTIFY:
 	default:
 		/* BB FIXME for unimplemented cases above */
-		cERROR(1, "no length check for command");
+		cifs_dbg(VFS, "no length check for command\n");
 		break;
 	}
 
@@ -256,20 +286,20 @@ smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
 	 * we have little choice but to ignore the data area in this case.
 	 */
 	if (*off > 4096) {
-		cERROR(1, "offset %d too large, data area ignored", *off);
+		cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
 		*len = 0;
 		*off = 0;
 	} else if (*off < 0) {
-		cERROR(1, "negative offset %d to data invalid ignore data area",
-			  *off);
+		cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
+			 *off);
 		*off = 0;
 		*len = 0;
 	} else if (*len < 0) {
-		cERROR(1, "negative data length %d invalid, data area ignored",
-			  *len);
+		cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
+			 *len);
 		*len = 0;
 	} else if (*len > 128 * 1024) {
-		cERROR(1, "data area larger than 128K: %d", *len);
+		cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
 		*len = 0;
 	}
 
@@ -285,8 +315,9 @@ smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
  * portion, the number of word parameters and the data portion of the message.
  */
 unsigned int
-smb2_calc_size(struct smb2_hdr *hdr)
+smb2_calc_size(void *buf)
 {
+	struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
 	struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
 	int offset; /* the offset from the beginning of SMB to data area */
 	int data_length; /* the length of the variable length data area */
@@ -303,7 +334,7 @@ smb2_calc_size(struct smb2_hdr *hdr)
 		goto calc_size_exit;
 
 	smb2_get_data_area_len(&offset, &data_length, hdr);
-	cFYI(1, "SMB2 data length %d offset %d", data_length, offset);
+	cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
 
 	if (data_length > 0) {
 		/*
@@ -314,15 +345,15 @@ smb2_calc_size(struct smb2_hdr *hdr)
 		 * the size of the RFC1001 hdr.
 		 */
 		if (offset + 4 + 1 < len) {
-			cERROR(1, "data area offset %d overlaps SMB2 header %d",
-				  offset + 4 + 1, len);
+			cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
+				 offset + 4 + 1, len);
 			data_length = 0;
 		} else {
 			len = 4 + offset + data_length;
 		}
 	}
 calc_size_exit:
-	cFYI(1, "SMB2 len %d", len);
+	cifs_dbg(FYI, "SMB2 len %d\n", len);
 	return len;
 }
 
@@ -345,3 +376,234 @@ cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
 					CIFS_MOUNT_MAP_SPECIAL_CHR);
 	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;
+
+	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 bool
+smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp,
+		    struct smb2_lease_break_work *lw)
+{
+	bool found;
+	__u8 lease_state;
+	struct list_head *tmp;
+	struct cifsFileInfo *cfile;
+	struct TCP_Server_Info *server = tcon->ses->server;
+	struct cifs_pending_open *open;
+	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(tmp, &tcon->openFileList) {
+		cfile = list_entry(tmp, struct cifsFileInfo, tlist);
+		cinode = CIFS_I(cfile->dentry->d_inode);
+
+		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%d\n",
+			 le32_to_cpu(rsp->NewLeaseState));
+
+		server->ops->set_oplock_level(cinode, lease_state, 0, NULL);
+
+		if (ack_req)
+			cfile->oplock_break_cancelled = false;
+		else
+			cfile->oplock_break_cancelled = true;
+
+		queue_work(cifsiod_wq, &cfile->oplock_break);
+		kfree(lw);
+		return true;
+	}
+
+	found = false;
+	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 = true;
+			memcpy(lw->lease_key, open->lease_key,
+			       SMB2_LEASE_KEY_SIZE);
+			lw->tlink = cifs_get_tlink(open->tlink);
+			queue_work(cifsiod_wq, &lw->lease_break);
+		}
+
+		cifs_dbg(FYI, "found in the pending open list\n");
+		cifs_dbg(FYI, "lease key match, lease break 0x%d\n",
+			 le32_to_cpu(rsp->NewLeaseState));
+
+		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 list_head *tmp, *tmp1, *tmp2;
+	struct TCP_Server_Info *server;
+	struct cifs_ses *ses;
+	struct cifs_tcon *tcon;
+	struct smb2_lease_break_work *lw;
+
+	lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
+	if (!lw)
+		return false;
+
+	INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
+	lw->lease_state = rsp->NewLeaseState;
+
+	cifs_dbg(FYI, "Checking for lease break\n");
+
+	/* look up tcon based on tid & uid */
+	spin_lock(&cifs_tcp_ses_lock);
+	list_for_each(tmp, &cifs_tcp_ses_list) {
+		server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list);
+
+		list_for_each(tmp1, &server->smb_ses_list) {
+			ses = list_entry(tmp1, struct cifs_ses, smb_ses_list);
+
+			spin_lock(&cifs_file_list_lock);
+			list_for_each(tmp2, &ses->tcon_list) {
+				tcon = list_entry(tmp2, struct cifs_tcon,
+						  tcon_list);
+				cifs_stats_inc(
+				    &tcon->stats.cifs_stats.num_oplock_brks);
+				if (smb2_tcon_has_lease(tcon, rsp, lw)) {
+					spin_unlock(&cifs_file_list_lock);
+					spin_unlock(&cifs_tcp_ses_lock);
+					return true;
+				}
+			}
+			spin_unlock(&cifs_file_list_lock);
+		}
+	}
+	spin_unlock(&cifs_tcp_ses_lock);
+	kfree(lw);
+	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 list_head *tmp, *tmp1, *tmp2;
+	struct cifs_ses *ses;
+	struct cifs_tcon *tcon;
+	struct cifsInodeInfo *cinode;
+	struct cifsFileInfo *cfile;
+
+	cifs_dbg(FYI, "Checking for oplock break\n");
+
+	if (rsp->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%d\n", rsp->OplockLevel);
+
+	/* look up tcon based on tid & uid */
+	spin_lock(&cifs_tcp_ses_lock);
+	list_for_each(tmp, &server->smb_ses_list) {
+		ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
+		list_for_each(tmp1, &ses->tcon_list) {
+			tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
+
+			cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
+			spin_lock(&cifs_file_list_lock);
+			list_for_each(tmp2, &tcon->openFileList) {
+				cfile = list_entry(tmp2, struct cifsFileInfo,
+						     tlist);
+				if (rsp->PersistentFid !=
+				    cfile->fid.persistent_fid ||
+				    rsp->VolatileFid !=
+				    cfile->fid.volatile_fid)
+					continue;
+
+				cifs_dbg(FYI, "file id match, oplock break\n");
+				cinode = CIFS_I(cfile->dentry->d_inode);
+
+				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);
+
+				/*
+				 * Set flag if the server downgrades the oplock
+				 * to L2 else clear.
+				 */
+				if (rsp->OplockLevel)
+					set_bit(
+					   CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
+					   &cinode->flags);
+				else
+					clear_bit(
+					   CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
+					   &cinode->flags);
+
+				queue_work(cifsiod_wq, &cfile->oplock_break);
+
+				spin_unlock(&cifs_file_list_lock);
+				spin_unlock(&cifs_tcp_ses_lock);
+				return true;
+			}
+			spin_unlock(&cifs_file_list_lock);
+			spin_unlock(&cifs_tcp_ses_lock);
+			cifs_dbg(FYI, "No matching file for oplock break\n");
+			return true;
+		}
+	}
+	spin_unlock(&cifs_tcp_ses_lock);
+	cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
+	return false;
+}