Commit message: cifs: Fix use-after-free in SMB2_read

There is a KASAN use-after-free:
BUG: KASAN: use-after-free in SMB2_read+0x1136/0x1190
Read of size 8 at addr ffff8880b4e45e50 by task ln/1009

Should not release the 'req' because it will use in the trace.

Fixes: eccb4422cf97 ("smb3: Add ftrace tracepoints for improved SMB3 debugging")

Signed-off-by: ZhangXiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org> 4.18+
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
CVE: CVE-2019-15920
CWE: CWE-416
Vulnerability description: An issue was discovered in the Linux kernel before 5.0.10. SMB2_read in fs/cifs/smb2pdu.c has a use-after-free. NOTE: this was not fixed correctly in 5.0.10; see the 5.0.11 ChangeLog, which documents a memory leak.

Project: linux
File: smb2pdu.c

SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
	      u64 persistent_fid, u64 volatile_fid, int level)
{
	struct smb_rqst rqst;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov;
	struct kvec rsp_iov;
	int rc = 0;
	int resp_buftype, max_len, min_len;
	struct cifs_ses *ses = tcon->ses;
	unsigned int rsp_len, offset;
	int flags = 0;

	if (level == FS_DEVICE_INFORMATION) {
		max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
		min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
	} else if (level == FS_ATTRIBUTE_INFORMATION) {
		max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
		min_len = MIN_FS_ATTR_INFO_SIZE;
	} else if (level == FS_SECTOR_SIZE_INFORMATION) {
		max_len = sizeof(struct smb3_fs_ss_info);
		min_len = sizeof(struct smb3_fs_ss_info);
	} else if (level == FS_VOLUME_INFORMATION) {
		max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
		min_len = sizeof(struct smb3_fs_vol_info);
	} else {
		cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
		return -EINVAL;
	}

	rc = build_qfs_info_req(&iov, tcon, level, max_len,
				persistent_fid, volatile_fid);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = &iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	cifs_small_buf_release(iov.iov_base);
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qfsattr_exit;
	}
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;

	rsp_len = le32_to_cpu(rsp->OutputBufferLength);
	offset = le16_to_cpu(rsp->OutputBufferOffset);
	rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
	if (rc)
		goto qfsattr_exit;

	if (level == FS_ATTRIBUTE_INFORMATION)
		memcpy(&tcon->fsAttrInfo, offset
			+ (char *)rsp, min_t(unsigned int,
			rsp_len, max_len));
	else if (level == FS_DEVICE_INFORMATION)
		memcpy(&tcon->fsDevInfo, offset
			+ (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
	else if (level == FS_SECTOR_SIZE_INFORMATION) {
		struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
			(offset + (char *)rsp);
		tcon->ss_flags = le32_to_cpu(ss_info->Flags);
		tcon->perf_sector_size =
			le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
	} else if (level == FS_VOLUME_INFORMATION) {
		struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
			(offset + (char *)rsp);
		tcon->vol_serial_number = vol_info->VolumeSerialNumber;
		tcon->vol_create_time = vol_info->VolumeCreationTime;
	}

qfsattr_exit:
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
	return rc;
}

Project: linux
File: smb2pdu.c

SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
	      u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
{
	struct smb_rqst rqst;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov;
	struct kvec rsp_iov;
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
	struct smb2_fs_full_size_info *info = NULL;
	int flags = 0;

	rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
				sizeof(struct smb2_fs_full_size_info),
				persistent_fid, volatile_fid);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = &iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	cifs_small_buf_release(iov.iov_base);
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qfsinf_exit;
	}
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;

	info = (struct smb2_fs_full_size_info *)(
		le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
			       le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
			       sizeof(struct smb2_fs_full_size_info));
	if (!rc)
		smb2_copy_fs_info_to_kstatfs(info, fsdata);

qfsinf_exit:
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
	return rc;
}

Project: linux
File: smb2pdu.c

SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
{
	int rc;
	struct cifs_ses *ses = sess_data->ses;
	struct cifs_spnego_msg *msg;
	struct key *spnego_key = NULL;
	struct smb2_sess_setup_rsp *rsp = NULL;

	rc = SMB2_sess_alloc_buffer(sess_data);
	if (rc)
		goto out;

	spnego_key = cifs_get_spnego_key(ses);
	if (IS_ERR(spnego_key)) {
		rc = PTR_ERR(spnego_key);
		spnego_key = NULL;
		goto out;
	}

	msg = spnego_key->payload.data[0];
	/*
	 * check version field to make sure that cifs.upcall is
	 * sending us a response in an expected form
	 */
	if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
		cifs_dbg(VFS,
			  "bad cifs.upcall version. Expected %d got %d",
			  CIFS_SPNEGO_UPCALL_VERSION, msg->version);
		rc = -EKEYREJECTED;
		goto out_put_spnego_key;
	}

	ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
					 GFP_KERNEL);
	if (!ses->auth_key.response) {
		cifs_dbg(VFS,
			"Kerberos can't allocate (%u bytes) memory",
			msg->sesskey_len);
		rc = -ENOMEM;
		goto out_put_spnego_key;
	}
	ses->auth_key.len = msg->sesskey_len;

	sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
	sess_data->iov[1].iov_len = msg->secblob_len;

	rc = SMB2_sess_sendreceive(sess_data);
	if (rc)
		goto out_put_spnego_key;

	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
	ses->Suid = rsp->sync_hdr.SessionId;

	ses->session_flags = le16_to_cpu(rsp->SessionFlags);

	rc = SMB2_sess_establish_session(sess_data);
out_put_spnego_key:
	key_invalidate(spnego_key);
	key_put(spnego_key);
out:
	sess_data->result = rc;
	sess_data->func = NULL;
	SMB2_sess_free_buffer(sess_data);
}

Project: linux
File: smb2pdu.c

SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
	   u64 persistent_fid, u64 volatile_fid)
{
	return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
}

Project: linux
File: smb2pdu.c

SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
		 u64 persistent_fid, u64 volatile_fid, int flags)
{
	struct smb_rqst rqst;
	struct smb2_close_rsp *rsp = NULL;
	struct cifs_ses *ses = tcon->ses;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buftype = CIFS_NO_BUFFER;
	int rc = 0;

	cifs_dbg(FYI, "Close\n");

	if (!ses || !(ses->server))
		return -EIO;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	memset(&iov, 0, sizeof(iov));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
	if (rc)
		goto close_exit;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
		trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
				     rc);
		goto close_exit;
	}

	atomic_dec(&tcon->num_remote_opens);

	/* BB FIXME - decode close response, update inode for caching */

close_exit:
	SMB2_close_free(&rqst);
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

Project: linux
File: smb2pdu.c

SMB2_close_free(struct smb_rqst *rqst)
{
	if (rqst && rqst->rq_iov)
		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
}

Project: linux
File: smb2pdu.c

SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
		u64 persistent_fid, u64 volatile_fid)
{
	struct smb2_close_req *req;
	struct kvec *iov = rqst->rq_iov;
	unsigned int total_len;
	int rc;

	rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	return 0;
}

Project: linux
File: smb2pdu.c

SMB2_echo(struct TCP_Server_Info *server)
{
	struct smb2_echo_req *req;
	int rc = 0;
	struct kvec iov[1];
	struct smb_rqst rqst = { .rq_iov = iov,
				 .rq_nvec = 1 };
	unsigned int total_len;

	cifs_dbg(FYI, "In echo request\n");

	if (server->tcpStatus == CifsNeedNegotiate) {
		/* No need to send echo on newly established connections */
		queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
		return rc;
	}

	rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
	if (rc)
		return rc;

	req->sync_hdr.CreditRequest = cpu_to_le16(1);

	iov[0].iov_len = total_len;
	iov[0].iov_base = (char *)req;

	rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
			     server, CIFS_ECHO_OP, NULL);
	if (rc)
		cifs_dbg(FYI, "Echo request failed: %d\n", rc);

	cifs_small_buf_release(req);
	return rc;
}

Project: linux
File: smb2pdu.c

SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
	   u64 volatile_fid)
{
	struct smb_rqst rqst;
	struct smb2_flush_req *req;
	struct cifs_ses *ses = tcon->ses;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buftype;
	int rc = 0;
	int flags = 0;
	unsigned int total_len;

	cifs_dbg(FYI, "Flush\n");

	if (!ses || !(ses->server))
		return -EIO;

	rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	cifs_small_buf_release(req);

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
		trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
				     rc);
	}

	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
	return rc;
}

Project: linux
File: smb2pdu.c

SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
		 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
{
	return query_info(xid, tcon, persistent_fid, volatile_fid,
			  FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
			  sizeof(struct smb2_file_internal_info),
			  sizeof(struct smb2_file_internal_info),
			  (void **)&uniqueid, NULL);
}

Project: linux
File: smb2pdu.c

SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
	   u64 volatile_fid, u32 opcode, bool is_fsctl,
	   char *in_data, u32 indatalen, u32 max_out_data_len,
	   char **out_data, u32 *plen /* returned data len */)
{
	struct smb_rqst rqst;
	struct smb2_ioctl_rsp *rsp = NULL;
	struct cifs_ses *ses;
	struct kvec iov[SMB2_IOCTL_IOV_SIZE];
	struct kvec rsp_iov = {NULL, 0};
	int resp_buftype = CIFS_NO_BUFFER;
	int rc = 0;
	int flags = 0;

	cifs_dbg(FYI, "SMB2 IOCTL\n");

	if (out_data != NULL)
		*out_data = NULL;

	/* zero out returned data len, in case of error */
	if (plen)
		*plen = 0;

	if (tcon)
		ses = tcon->ses;
	else
		return -EIO;

	if (!ses || !(ses->server))
		return -EIO;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	memset(&iov, 0, sizeof(iov));
	rqst.rq_iov = iov;
	rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;

	rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid, opcode,
			     is_fsctl, in_data, indatalen, max_out_data_len);
	if (rc)
		goto ioctl_exit;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
			    &rsp_iov);
	rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;

	if (rc != 0)
		trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
				ses->Suid, 0, opcode, rc);

	if ((rc != 0) && (rc != -EINVAL)) {
		cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
		goto ioctl_exit;
	} else if (rc == -EINVAL) {
		if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
		    (opcode != FSCTL_SRV_COPYCHUNK)) {
			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
			goto ioctl_exit;
		}
	}

	/* check if caller wants to look at return data or just return rc */
	if ((plen == NULL) || (out_data == NULL))
		goto ioctl_exit;

	*plen = le32_to_cpu(rsp->OutputCount);

	/* We check for obvious errors in the output buffer length and offset */
	if (*plen == 0)
		goto ioctl_exit; /* server returned no data */
	else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
		cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
		*plen = 0;
		rc = -EIO;
		goto ioctl_exit;
	}

	if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
		cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
			le32_to_cpu(rsp->OutputOffset));
		*plen = 0;
		rc = -EIO;
		goto ioctl_exit;
	}

	*out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
			    *plen, GFP_KERNEL);
	if (*out_data == NULL) {
		rc = -ENOMEM;
		goto ioctl_exit;
	}

ioctl_exit:
	SMB2_ioctl_free(&rqst);
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

Project: linux
File: smb2pdu.c

SMB2_ioctl_free(struct smb_rqst *rqst)
{
	if (rqst && rqst->rq_iov)
		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
}

Project: linux
File: smb2pdu.c

SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
		u64 persistent_fid, u64 volatile_fid, u32 opcode,
		bool is_fsctl, char *in_data, u32 indatalen,
		__u32 max_response_size)
{
	struct smb2_ioctl_req *req;
	struct kvec *iov = rqst->rq_iov;
	unsigned int total_len;
	int rc;

	rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	req->CtlCode = cpu_to_le32(opcode);
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	iov[0].iov_base = (char *)req;
	/*
	 * If no input data, the size of ioctl struct in
	 * protocol spec still includes a 1 byte data buffer,
	 * but if input data passed to ioctl, we do not
	 * want to double count this, so we do not send
	 * the dummy one byte of data in iovec[0] if sending
	 * input data (in iovec[1]).
	 */
	if (indatalen) {
		req->InputCount = cpu_to_le32(indatalen);
		/* do not set InputOffset if no input data */
		req->InputOffset =
		       cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
		rqst->rq_nvec = 2;
		iov[0].iov_len = total_len - 1;
		iov[1].iov_base = in_data;
		iov[1].iov_len = indatalen;
	} else {
		rqst->rq_nvec = 1;
		iov[0].iov_len = total_len;
	}

	req->OutputOffset = 0;
	req->OutputCount = 0; /* MBZ */

	/*
	 * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
	 * We Could increase default MaxOutputResponse, but that could require
	 * more credits. Windows typically sets this smaller, but for some
	 * ioctls it may be useful to allow server to send more. No point
	 * limiting what the server can send as long as fits in one credit
	 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
	 * to increase this limit up in the future.
	 * Note that for snapshot queries that servers like Azure expect that
	 * the first query be minimal size (and just used to get the number/size
	 * of previous versions) so response size must be specified as EXACTLY
	 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
	 * of eight bytes.  Currently that is the only case where we set max
	 * response size smaller.
	 */
	req->MaxOutputResponse = cpu_to_le32(max_response_size);

	if (is_fsctl)
		req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
	else
		req->Flags = 0;

	/* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
		req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;

	return 0;
}

Project: linux
File: smb2pdu.c

SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
		 __u8 *lease_key, const __le32 lease_state)
{
	struct smb_rqst rqst;
	int rc;
	struct smb2_lease_ack *req = NULL;
	struct cifs_ses *ses = tcon->ses;
	int flags = CIFS_OBREAK_OP;
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;
	__u64 *please_key_high;
	__u64 *please_key_low;

	cifs_dbg(FYI, "SMB2_lease_break\n");
	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	req->sync_hdr.CreditRequest = cpu_to_le16(1);
	req->StructureSize = cpu_to_le16(36);
	total_len += 12;

	memcpy(req->LeaseKey, lease_key, 16);
	req->LeaseState = lease_state;

	flags |= CIFS_NO_RESP;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
	cifs_small_buf_release(req);

	please_key_low = (__u64 *)lease_key;
	please_key_high = (__u64 *)(lease_key+8);
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
		trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
			ses->Suid, *please_key_low, *please_key_high, rc);
		cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
	} else
		trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
			ses->Suid, *please_key_low, *please_key_high);

	return rc;
}

Project: linux
File: smb2pdu.c

SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
{
	struct smb_rqst rqst;
	struct smb2_logoff_req *req; /* response is also trivial struct */
	int rc = 0;
	struct TCP_Server_Info *server;
	int flags = 0;
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;

	cifs_dbg(FYI, "disconnect session %p\n", ses);

	if (ses && (ses->server))
		server = ses->server;
	else
		return -EIO;

	/* no need to send SMB logoff if uid already closed due to reconnect */
	if (ses->need_reconnect)
		goto smb2_session_already_dead;

	rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
	if (rc)
		return rc;

	 /* since no tcon, smb2_init can not do this, so do here */
	req->sync_hdr.SessionId = ses->Suid;

	if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
		flags |= CIFS_TRANSFORM_REQ;
	else if (server->sign)
		req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;

	flags |= CIFS_NO_RESP;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
	cifs_small_buf_release(req);
	/*
	 * No tcon so can't do
	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
	 */

smb2_session_already_dead:
	return rc;
}

Project: linux
File: smb2pdu.c

SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
	       struct cifs_open_parms *oparms, __le16 *path)
{
	struct TCP_Server_Info *server = tcon->ses->server;
	struct smb2_create_req *req;
	unsigned int n_iov = 2;
	__u32 file_attributes = 0;
	int copy_size;
	int uni_path_len;
	unsigned int total_len;
	struct kvec *iov = rqst->rq_iov;
	__le16 *copy_path;
	int rc;

	rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	iov[0].iov_base = (char *)req;
	/* -1 since last byte is buf[0] which is sent below (path) */
	iov[0].iov_len = total_len - 1;

	if (oparms->create_options & CREATE_OPTION_READONLY)
		file_attributes |= ATTR_READONLY;
	if (oparms->create_options & CREATE_OPTION_SPECIAL)
		file_attributes |= ATTR_SYSTEM;

	req->ImpersonationLevel = IL_IMPERSONATION;
	req->DesiredAccess = cpu_to_le32(oparms->desired_access);
	/* File attributes ignored on open (used in create though) */
	req->FileAttributes = cpu_to_le32(file_attributes);
	req->ShareAccess = FILE_SHARE_ALL_LE;
	req->CreateDisposition = cpu_to_le32(oparms->disposition);
	req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));

	/* [MS-SMB2] 2.2.13 NameOffset:
	 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
	 * the SMB2 header, the file name includes a prefix that will
	 * be processed during DFS name normalization as specified in
	 * section 3.3.5.9. Otherwise, the file name is relative to
	 * the share that is identified by the TreeId in the SMB2
	 * header.
	 */
	if (tcon->share_flags & SHI1005_FLAGS_DFS) {
		int name_len;

		req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
		rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
						 &name_len,
						 tcon->treeName, path);
		if (rc)
			return rc;
		req->NameLength = cpu_to_le16(name_len * 2);
		uni_path_len = copy_size;
		path = copy_path;
	} else {
		uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
		/* MUST set path len (NameLength) to 0 opening root of share */
		req->NameLength = cpu_to_le16(uni_path_len - 2);
		copy_size = uni_path_len;
		if (copy_size % 8 != 0)
			copy_size = roundup(copy_size, 8);
		copy_path = kzalloc(copy_size, GFP_KERNEL);
		if (!copy_path)
			return -ENOMEM;
		memcpy((char *)copy_path, (const char *)path,
		       uni_path_len);
		uni_path_len = copy_size;
		path = copy_path;
	}

	iov[1].iov_len = uni_path_len;
	iov[1].iov_base = path;

	if (!server->oplocks)
		*oplock = SMB2_OPLOCK_LEVEL_NONE;

	if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
	    *oplock == SMB2_OPLOCK_LEVEL_NONE)
		req->RequestedOplockLevel = *oplock;
	else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
		  (oparms->create_options & CREATE_NOT_FILE))
		req->RequestedOplockLevel = *oplock; /* no srv lease support */
	else {
		rc = add_lease_context(server, iov, &n_iov,
				       oparms->fid->lease_key, oplock);
		if (rc)
			return rc;
	}

	if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
		/* need to set Next field of lease context if we request it */
		if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
			struct create_context *ccontext =
			    (struct create_context *)iov[n_iov-1].iov_base;
			ccontext->Next =
				cpu_to_le32(server->vals->create_lease_size);
		}

		rc = add_durable_context(iov, &n_iov, oparms,
					tcon->use_persistent);
		if (rc)
			return rc;
	}

	if (tcon->posix_extensions) {
		if (n_iov > 2) {
			struct create_context *ccontext =
			    (struct create_context *)iov[n_iov-1].iov_base;
			ccontext->Next =
				cpu_to_le32(iov[n_iov-1].iov_len);
		}

		rc = add_posix_context(iov, &n_iov, oparms->mode);
		if (rc)
			return rc;
	}

	if (tcon->snapshot_time) {
		cifs_dbg(FYI, "adding snapshot context\n");
		if (n_iov > 2) {
			struct create_context *ccontext =
			    (struct create_context *)iov[n_iov-1].iov_base;
			ccontext->Next =
				cpu_to_le32(iov[n_iov-1].iov_len);
		}

		rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
		if (rc)
			return rc;
	}


	rqst->rq_nvec = n_iov;
	return 0;
}

Project: linux
File: smb2pdu.c

SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
		  const u64 persistent_fid, const u64 volatile_fid,
		  __u8 oplock_level)
{
	struct smb_rqst rqst;
	int rc;
	struct smb2_oplock_break *req = NULL;
	struct cifs_ses *ses = tcon->ses;
	int flags = CIFS_OBREAK_OP;
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;

	cifs_dbg(FYI, "SMB2_oplock_break\n");
	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	req->VolatileFid = volatile_fid;
	req->PersistentFid = persistent_fid;
	req->OplockLevel = oplock_level;
	req->sync_hdr.CreditRequest = cpu_to_le16(1);

	flags |= CIFS_NO_RESP;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
	cifs_small_buf_release(req);

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
		cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
	}

	return rc;
}

Project: linux
File: smb2pdu.c

SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
		u64 persistent_fid, u64 volatile_fid,
		void **data, u32 *plen)
{
	__u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
	*plen = 0;

	return query_info(xid, tcon, persistent_fid, volatile_fid,
			  0, SMB2_O_INFO_SECURITY, additional_info,
			  SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
}

Project: linux
File: smb2pdu.c

SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
		     u64 persistent_fid, u64 volatile_fid, int index,
		     struct cifs_search_info *srch_inf)
{
	struct smb_rqst rqst;
	struct smb2_query_directory_req *req;
	struct smb2_query_directory_rsp *rsp = NULL;
	struct kvec iov[2];
	struct kvec rsp_iov;
	int rc = 0;
	int len;
	int resp_buftype = CIFS_NO_BUFFER;
	unsigned char *bufptr;
	struct TCP_Server_Info *server;
	struct cifs_ses *ses = tcon->ses;
	__le16 asteriks = cpu_to_le16('*');
	char *end_of_smb;
	unsigned int output_size = CIFSMaxBufSize;
	size_t info_buf_size;
	int flags = 0;
	unsigned int total_len;

	if (ses && (ses->server))
		server = ses->server;
	else
		return -EIO;

	rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	switch (srch_inf->info_level) {
	case SMB_FIND_FILE_DIRECTORY_INFO:
		req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
		info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
		break;
	case SMB_FIND_FILE_ID_FULL_DIR_INFO:
		req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
		info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
		break;
	default:
		cifs_dbg(VFS, "info level %u isn't supported\n",
			 srch_inf->info_level);
		rc = -EINVAL;
		goto qdir_exit;
	}

	req->FileIndex = cpu_to_le32(index);
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	len = 0x2;
	bufptr = req->Buffer;
	memcpy(bufptr, &asteriks, len);

	req->FileNameOffset =
		cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
	req->FileNameLength = cpu_to_le16(len);
	/*
	 * BB could be 30 bytes or so longer if we used SMB2 specific
	 * buffer lengths, but this is safe and close enough.
	 */
	output_size = min_t(unsigned int, output_size, server->maxBuf);
	output_size = min_t(unsigned int, output_size, 2 << 15);
	req->OutputBufferLength = cpu_to_le32(output_size);

	iov[0].iov_base = (char *)req;
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;

	iov[1].iov_base = (char *)(req->Buffer);
	iov[1].iov_len = len;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 2;

	trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
			tcon->ses->Suid, index, output_size);

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	cifs_small_buf_release(req);
	rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;

	if (rc) {
		if (rc == -ENODATA &&
		    rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
			trace_smb3_query_dir_done(xid, persistent_fid,
				tcon->tid, tcon->ses->Suid, index, 0);
			srch_inf->endOfSearch = true;
			rc = 0;
		} else {
			trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
				tcon->ses->Suid, index, 0, rc);
			cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
		}
		goto qdir_exit;
	}

	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
			       le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
			       info_buf_size);
	if (rc) {
		trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
			tcon->ses->Suid, index, 0, rc);
		goto qdir_exit;
	}

	srch_inf->unicode = true;

	if (srch_inf->ntwrk_buf_start) {
		if (srch_inf->smallBuf)
			cifs_small_buf_release(srch_inf->ntwrk_buf_start);
		else
			cifs_buf_release(srch_inf->ntwrk_buf_start);
	}
	srch_inf->ntwrk_buf_start = (char *)rsp;
	srch_inf->srch_entries_start = srch_inf->last_entry =
		(char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
	end_of_smb = rsp_iov.iov_len + (char *)rsp;
	srch_inf->entries_in_buffer =
			num_entries(srch_inf->srch_entries_start, end_of_smb,
				    &srch_inf->last_entry, info_buf_size);
	srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
	cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
		 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
		 srch_inf->srch_entries_start, srch_inf->last_entry);
	if (resp_buftype == CIFS_LARGE_BUFFER)
		srch_inf->smallBuf = false;
	else if (resp_buftype == CIFS_SMALL_BUFFER)
		srch_inf->smallBuf = true;
	else
		cifs_dbg(VFS, "illegal search buffer type\n");

	trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
			tcon->ses->Suid, index, srch_inf->entries_in_buffer);
	return rc;

qdir_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

Project: linux
File: smb2pdu.c

int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
	u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
{
	return query_info(xid, tcon, persistent_fid, volatile_fid,
			  FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
			  sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
			  sizeof(struct smb2_file_all_info), (void **)&data,
			  NULL);
}

Project: linux
File: smb2pdu.c

SMB2_query_info_free(struct smb_rqst *rqst)
{
	if (rqst && rqst->rq_iov)
		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
}

Project: linux
File: smb2pdu.c

SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
		     u64 persistent_fid, u64 volatile_fid,
		     u8 info_class, u8 info_type, u32 additional_info,
		     size_t output_len, size_t input_len, void *input)
{
	struct smb2_query_info_req *req;
	struct kvec *iov = rqst->rq_iov;
	unsigned int total_len;
	int rc;

	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	req->InfoType = info_type;
	req->FileInfoClass = info_class;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
	req->AdditionalInformation = cpu_to_le32(additional_info);

	req->OutputBufferLength = cpu_to_le32(output_len);
	if (input_len) {
		req->InputBufferLength = cpu_to_le32(input_len);
		/* total_len for smb query request never close to le16 max */
		req->InputBufferOffset = cpu_to_le16(total_len - 1);
		memcpy(req->Buffer, input, input_len);
	}

	iov[0].iov_base = (char *)req;
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1 + input_len;
	return 0;
}

Project: linux
File: smb2pdu.c

SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
{
	int type;

	type = smb2_select_sectype(ses->server, ses->sectype);
	cifs_dbg(FYI, "sess setup type %d\n", type);
	if (type == Unspecified) {
		cifs_dbg(VFS,
			"Unable to select appropriate authentication method!");
		return -EINVAL;
	}

	switch (type) {
	case Kerberos:
		sess_data->func = SMB2_auth_kerberos;
		break;
	case RawNTLMSSP:
		sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
		break;
	default:
		cifs_dbg(VFS, "secType %d not supported!\n", type);
		return -EOPNOTSUPP;
	}

	return 0;
}

Project: linux
File: smb2pdu.c

SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
{
	int rc;
	struct cifs_ses *ses = sess_data->ses;
	struct smb2_sess_setup_req *req;
	struct TCP_Server_Info *server = ses->server;
	unsigned int total_len;

	rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	/* First session, not a reauthenticate */
	req->sync_hdr.SessionId = 0;

	/* if reconnect, we need to send previous sess id, otherwise it is 0 */
	req->PreviousSessionId = sess_data->previous_session;

	req->Flags = 0; /* MBZ */

	/* enough to enable echos and oplocks and one max size write */
	req->sync_hdr.CreditRequest = cpu_to_le16(130);

	/* only one of SMB2 signing flags may be set in SMB2 request */
	if (server->sign)
		req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
	else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
		req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
	else
		req->SecurityMode = 0;

	req->Capabilities = 0;
	req->Channel = 0; /* MBZ */

	sess_data->iov[0].iov_base = (char *)req;
	/* 1 for pad */
	sess_data->iov[0].iov_len = total_len - 1;
	/*
	 * This variable will be used to clear the buffer
	 * allocated above in case of any error in the calling function.
	 */
	sess_data->buf0_type = CIFS_SMALL_BUFFER;

	return 0;
}

Project: linux
File: smb2pdu.c

SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
{
	int rc;
	struct cifs_ses *ses = sess_data->ses;
	struct smb2_sess_setup_req *req;
	struct smb2_sess_setup_rsp *rsp = NULL;
	unsigned char *ntlmssp_blob = NULL;
	bool use_spnego = false; /* else use raw ntlmssp */
	u16 blob_length = 0;

	rc = SMB2_sess_alloc_buffer(sess_data);
	if (rc)
		goto out;

	req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
	req->sync_hdr.SessionId = ses->Suid;

	rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
					sess_data->nls_cp);
	if (rc) {
		cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
		goto out;
	}

	if (use_spnego) {
		/* BB eventually need to add this */
		cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
		rc = -EOPNOTSUPP;
		goto out;
	}
	sess_data->iov[1].iov_base = ntlmssp_blob;
	sess_data->iov[1].iov_len = blob_length;

	rc = SMB2_sess_sendreceive(sess_data);
	if (rc)
		goto out;

	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;

	ses->Suid = rsp->sync_hdr.SessionId;
	ses->session_flags = le16_to_cpu(rsp->SessionFlags);

	rc = SMB2_sess_establish_session(sess_data);
out:
	kfree(ntlmssp_blob);
	SMB2_sess_free_buffer(sess_data);
	kfree(ses->ntlmssp);
	ses->ntlmssp = NULL;
	sess_data->result = rc;
	sess_data->func = NULL;
}

Project: linux
File: smb2pdu.c

SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
{
	int rc;
	struct cifs_ses *ses = sess_data->ses;
	struct smb2_sess_setup_rsp *rsp = NULL;
	char *ntlmssp_blob = NULL;
	bool use_spnego = false; /* else use raw ntlmssp */
	u16 blob_length = 0;

	/*
	 * If memory allocation is successful, caller of this function
	 * frees it.
	 */
	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
	if (!ses->ntlmssp) {
		rc = -ENOMEM;
		goto out_err;
	}
	ses->ntlmssp->sesskey_per_smbsess = true;

	rc = SMB2_sess_alloc_buffer(sess_data);
	if (rc)
		goto out_err;

	ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
			       GFP_KERNEL);
	if (ntlmssp_blob == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
	if (use_spnego) {
		/* BB eventually need to add this */
		cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
		rc = -EOPNOTSUPP;
		goto out;
	} else {
		blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
		/* with raw NTLMSSP we don't encapsulate in SPNEGO */
	}
	sess_data->iov[1].iov_base = ntlmssp_blob;
	sess_data->iov[1].iov_len = blob_length;

	rc = SMB2_sess_sendreceive(sess_data);
	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;

	/* If true, rc here is expected and not an error */
	if (sess_data->buf0_type != CIFS_NO_BUFFER &&
		rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
		rc = 0;

	if (rc)
		goto out;

	if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
			le16_to_cpu(rsp->SecurityBufferOffset)) {
		cifs_dbg(VFS, "Invalid security buffer offset %d\n",
			le16_to_cpu(rsp->SecurityBufferOffset));
		rc = -EIO;
		goto out;
	}
	rc = decode_ntlmssp_challenge(rsp->Buffer,
			le16_to_cpu(rsp->SecurityBufferLength), ses);
	if (rc)
		goto out;

	cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");


	ses->Suid = rsp->sync_hdr.SessionId;
	ses->session_flags = le16_to_cpu(rsp->SessionFlags);

out:
	kfree(ntlmssp_blob);
	SMB2_sess_free_buffer(sess_data);
	if (!rc) {
		sess_data->result = 0;
		sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
		return;
	}
out_err:
	kfree(ses->ntlmssp);
	ses->ntlmssp = NULL;
	sess_data->result = rc;
	sess_data->func = NULL;
}

Project: linux
File: smb2pdu.c

SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
{
	int rc;
	struct smb_rqst rqst;
	struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
	struct kvec rsp_iov = { NULL, 0 };

	/* Testing shows that buffer offset must be at location of Buffer[0] */
	req->SecurityBufferOffset =
		cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
	req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = sess_data->iov;
	rqst.rq_nvec = 2;

	/* BB add code to build os and lm fields */
	rc = cifs_send_recv(sess_data->xid, sess_data->ses,
			    &rqst,
			    &sess_data->buf0_type,
			    CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
	cifs_small_buf_release(sess_data->iov[0].iov_base);
	memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));

	return rc;
}

Project: linux
File: smb2pdu.c

SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
		const struct nls_table *nls_cp)
{
	int rc = 0;
	struct TCP_Server_Info *server = ses->server;
	struct SMB2_sess_data *sess_data;

	cifs_dbg(FYI, "Session Setup\n");

	if (!server) {
		WARN(1, "%s: server is NULL!\n", __func__);
		return -EIO;
	}

	sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
	if (!sess_data)
		return -ENOMEM;

	rc = SMB2_select_sec(ses, sess_data);
	if (rc)
		goto out;
	sess_data->xid = xid;
	sess_data->ses = ses;
	sess_data->buf0_type = CIFS_NO_BUFFER;
	sess_data->nls_cp = (struct nls_table *) nls_cp;
	sess_data->previous_session = ses->Suid;

	/*
	 * Initialize the session hash with the server one.
	 */
	memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
	       SMB2_PREAUTH_HASH_SIZE);

	while (sess_data->func)
		sess_data->func(sess_data);

	if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
		cifs_dbg(VFS, "signing requested but authenticated as guest\n");
	rc = sess_data->result;
out:
	kfree(sess_data);
	return rc;
}

Project: linux
File: smb2pdu.c

SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
		     u64 persistent_fid, u64 volatile_fid)
{
	int rc;
	struct  compress_ioctl fsctl_input;
	char *ret_data = NULL;

	fsctl_input.CompressionState =
			cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);

	rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
			FSCTL_SET_COMPRESSION, true /* is_fsctl */,
			(char *)&fsctl_input /* data input */,
			2 /* in data len */, CIFSMaxBufSize /* max out data */,
			&ret_data /* out data */, NULL);

	cifs_dbg(FYI, "set compression rc %d\n", rc);

	return rc;
}

Project: linux
File: smb2pdu.c

SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
	    u64 persistent_fid, u64 volatile_fid,
	    struct smb2_file_full_ea_info *buf, int len)
{
	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
		current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
		0, 1, (void **)&buf, &len);
}

Project: linux
File: smb2pdu.c

SMB2_set_info_free(struct smb_rqst *rqst)
{
	if (rqst && rqst->rq_iov)
		cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
}

Project: linux
File: smb2pdu.c

SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
	       u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
	       u8 info_type, u32 additional_info,
		void **data, unsigned int *size)
{
	struct smb2_set_info_req *req;
	struct kvec *iov = rqst->rq_iov;
	unsigned int i, total_len;
	int rc;

	rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	req->sync_hdr.ProcessId = cpu_to_le32(pid);
	req->InfoType = info_type;
	req->FileInfoClass = info_class;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
	req->AdditionalInformation = cpu_to_le32(additional_info);

	req->BufferOffset =
			cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
	req->BufferLength = cpu_to_le32(*size);

	memcpy(req->Buffer, *data, *size);
	total_len += *size;

	iov[0].iov_base = (char *)req;
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;

	for (i = 1; i < rqst->rq_nvec; i++) {
		le32_add_cpu(&req->BufferLength, size[i]);
		iov[i].iov_base = (char *)data[i];
		iov[i].iov_len = size[i];
	}

	return 0;
}

Project: linux
File: smb2pdu.c

SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
	  struct cifs_tcon *tcon, const struct nls_table *cp)
{
	struct smb_rqst rqst;
	struct smb2_tree_connect_req *req;
	struct smb2_tree_connect_rsp *rsp = NULL;
	struct kvec iov[2];
	struct kvec rsp_iov = { NULL, 0 };
	int rc = 0;
	int resp_buftype;
	int unc_path_len;
	__le16 *unc_path = NULL;
	int flags = 0;
	unsigned int total_len;

	cifs_dbg(FYI, "TCON\n");

	if (!(ses->server) || !tree)
		return -EIO;

	unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
	if (unc_path == NULL)
		return -ENOMEM;

	unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
	unc_path_len *= 2;
	if (unc_path_len < 2) {
		kfree(unc_path);
		return -EINVAL;
	}

	/* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
	tcon->tid = 0;
	atomic_set(&tcon->num_remote_opens, 0);
	rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
			     &total_len);
	if (rc) {
		kfree(unc_path);
		return rc;
	}

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	iov[0].iov_base = (char *)req;
	/* 1 for pad */
	iov[0].iov_len = total_len - 1;

	/* Testing shows that buffer offset must be at location of Buffer[0] */
	req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
			- 1 /* pad */);
	req->PathLength = cpu_to_le16(unc_path_len - 2);
	iov[1].iov_base = unc_path;
	iov[1].iov_len = unc_path_len;

	/*
	 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
	 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
	 * (Samba servers don't always set the flag so also check if null user)
	 */
	if ((ses->server->dialect == SMB311_PROT_ID) &&
	    !smb3_encryption_required(tcon) &&
	    !(ses->session_flags &
		    (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
	    ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
		req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 2;

	/* Need 64 for max size write so ask for more in case not there yet */
	req->sync_hdr.CreditRequest = cpu_to_le16(64);

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	cifs_small_buf_release(req);
	rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
	trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
	if (rc != 0) {
		if (tcon) {
			cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
			tcon->need_reconnect = true;
		}
		goto tcon_error_exit;
	}

	switch (rsp->ShareType) {
	case SMB2_SHARE_TYPE_DISK:
		cifs_dbg(FYI, "connection to disk share\n");
		break;
	case SMB2_SHARE_TYPE_PIPE:
		tcon->pipe = true;
		cifs_dbg(FYI, "connection to pipe share\n");
		break;
	case SMB2_SHARE_TYPE_PRINT:
		tcon->print = true;
		cifs_dbg(FYI, "connection to printer\n");
		break;
	default:
		cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
		rc = -EOPNOTSUPP;
		goto tcon_error_exit;
	}

	tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
	tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
	tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
	tcon->tidStatus = CifsGood;
	tcon->need_reconnect = false;
	tcon->tid = rsp->sync_hdr.TreeId;
	strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));

	if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
	    ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
		cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");

	if (tcon->seal &&
	    !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
		cifs_dbg(VFS, "Encryption is requested but not supported\n");

	init_copy_chunk_defaults(tcon);
	if (tcon->ses->server->ops->validate_negotiate)
		rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
tcon_exit:

	free_rsp_buf(resp_buftype, rsp);
	kfree(unc_path);
	return rc;

tcon_error_exit:
	if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
		cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
	}
	goto tcon_exit;
}

Project: linux
File: smb2pdu.c

SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
{
	struct smb_rqst rqst;
	struct smb2_tree_disconnect_req *req; /* response is trivial */
	int rc = 0;
	struct cifs_ses *ses = tcon->ses;
	int flags = 0;
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;

	cifs_dbg(FYI, "Tree Disconnect\n");

	if (!ses || !(ses->server))
		return -EIO;

	if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
		return 0;

	rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	flags |= CIFS_NO_RESP;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
	cifs_small_buf_release(req);
	if (rc)
		cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);

	return rc;
}

Project: linux
File: smb2pdu.c

SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
	   unsigned int *nbytes, struct kvec *iov, int n_vec)
{
	struct smb_rqst rqst;
	int rc = 0;
	struct smb2_write_req *req = NULL;
	struct smb2_write_rsp *rsp = NULL;
	int resp_buftype;
	struct kvec rsp_iov;
	int flags = 0;
	unsigned int total_len;

	*nbytes = 0;

	if (n_vec < 1)
		return rc;

	rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	if (io_parms->tcon->ses->server == NULL)
		return -ECONNABORTED;

	if (smb3_encryption_required(io_parms->tcon))
		flags |= CIFS_TRANSFORM_REQ;

	req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);

	req->PersistentFileId = io_parms->persistent_fid;
	req->VolatileFileId = io_parms->volatile_fid;
	req->WriteChannelInfoOffset = 0;
	req->WriteChannelInfoLength = 0;
	req->Channel = 0;
	req->Length = cpu_to_le32(io_parms->length);
	req->Offset = cpu_to_le64(io_parms->offset);
	req->DataOffset = cpu_to_le16(
				offsetof(struct smb2_write_req, Buffer));
	req->RemainingBytes = 0;

	trace_smb3_write_enter(xid, io_parms->persistent_fid,
		io_parms->tcon->tid, io_parms->tcon->ses->Suid,
		io_parms->offset, io_parms->length);

	iov[0].iov_base = (char *)req;
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = n_vec + 1;

	rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
			    &resp_buftype, flags, &rsp_iov);
	rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;

	if (rc) {
		trace_smb3_write_err(xid, req->PersistentFileId,
				     io_parms->tcon->tid,
				     io_parms->tcon->ses->Suid,
				     io_parms->offset, io_parms->length, rc);
		cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
		cifs_dbg(VFS, "Send error in write = %d\n", rc);
	} else {
		*nbytes = le32_to_cpu(rsp->DataLength);
		trace_smb3_write_done(xid, req->PersistentFileId,
				     io_parms->tcon->tid,
				     io_parms->tcon->ses->Suid,
				     io_parms->offset, *nbytes);
	}

	cifs_small_buf_release(req);
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

Project: linux
File: smb2pdu.c

SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
	      u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
{
	struct smb_rqst rqst;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov;
	struct kvec rsp_iov;
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
	FILE_SYSTEM_POSIX_INFO *info = NULL;
	int flags = 0;

	rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
				sizeof(FILE_SYSTEM_POSIX_INFO),
				persistent_fid, volatile_fid);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = &iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	cifs_small_buf_release(iov.iov_base);
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto posix_qfsinf_exit;
	}
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;

	info = (FILE_SYSTEM_POSIX_INFO *)(
		le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
			       le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
			       sizeof(FILE_SYSTEM_POSIX_INFO));
	if (!rc)
		copy_posix_fs_info_to_kstatfs(info, fsdata);

posix_qfsinf_exit:
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
	return rc;
}

Project: linux
File: smb2pdu.c

static int __smb2_reconnect(const struct nls_table *nlsc,
			    struct cifs_tcon *tcon)
{
	int rc;
	struct dfs_cache_tgt_list tl;
	struct dfs_cache_tgt_iterator *it = NULL;
	char *tree;
	const char *tcp_host;
	size_t tcp_host_len;
	const char *dfs_host;
	size_t dfs_host_len;

	tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
	if (!tree)
		return -ENOMEM;

	if (tcon->ipc) {
		scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$",
			  tcon->ses->server->hostname);
		rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
		goto out;
	}

	if (!tcon->dfs_path) {
		rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
		goto out;
	}

	rc = dfs_cache_noreq_find(tcon->dfs_path + 1, NULL, &tl);
	if (rc)
		goto out;

	extract_unc_hostname(tcon->ses->server->hostname, &tcp_host,
			     &tcp_host_len);

	for (it = dfs_cache_get_tgt_iterator(&tl); it;
	     it = dfs_cache_get_next_tgt(&tl, it)) {
		const char *tgt = dfs_cache_get_tgt_name(it);

		extract_unc_hostname(tgt, &dfs_host, &dfs_host_len);

		if (dfs_host_len != tcp_host_len
		    || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
			cifs_dbg(FYI, "%s: skipping %.*s, doesn't match %.*s",
				 __func__,
				 (int)dfs_host_len, dfs_host,
				 (int)tcp_host_len, tcp_host);
			continue;
		}

		scnprintf(tree, MAX_TREE_SIZE, "\\%s", tgt);

		rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
		if (!rc)
			break;
		if (rc == -EREMOTE)
			break;
	}

	if (!rc) {
		if (it)
			rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1,
							    it);
		else
			rc = -ENOENT;
	}
	dfs_cache_free_tgts(&tl);
out:
	kfree(tree);
	return rc;
}

Project: linux
File: smb2pdu.c

add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
		    struct cifs_open_parms *oparms)
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

	/* indicate that we don't need to relock the file */
	oparms->reconnect = false;

	iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset =
			cpu_to_le32(sizeof(struct smb2_create_req) +
								iov[1].iov_len);
	le32_add_cpu(&req->CreateContextsLength,
			sizeof(struct create_durable_handle_reconnect_v2));
	*num_iovec = num + 1;
	return 0;
}

Project: linux
File: smb2pdu.c

add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
		    struct cifs_open_parms *oparms)
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

	iov[num].iov_base = create_durable_v2_buf(oparms);
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct create_durable_v2);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset =
			cpu_to_le32(sizeof(struct smb2_create_req) +
								iov[1].iov_len);
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
	*num_iovec = num + 1;
	return 0;
}

Project: linux
File: smb2pdu.c

add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

	iov[num].iov_base = create_posix_buf(mode);
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct create_posix);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset = cpu_to_le32(
				sizeof(struct smb2_create_req) +
				iov[num - 1].iov_len);
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
	*num_iovec = num + 1;
	return 0;
}

Project: linux
File: smb2pdu.c

alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
			    const char *treename, const __le16 *path)
{
	int treename_len, path_len;
	struct nls_table *cp;
	const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};

	/*
	 * skip leading "\\"
	 */
	treename_len = strlen(treename);
	if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
		return -EINVAL;

	treename += 2;
	treename_len -= 2;

	path_len = UniStrnlen((wchar_t *)path, PATH_MAX);

	/*
	 * make room for one path separator between the treename and
	 * path
	 */
	*out_len = treename_len + 1 + path_len;

	/*
	 * final path needs to be null-terminated UTF16 with a
	 * size aligned to 8
	 */

	*out_size = roundup((*out_len+1)*2, 8);
	*out_path = kzalloc(*out_size, GFP_KERNEL);
	if (!*out_path)
		return -ENOMEM;

	cp = load_nls_default();
	cifs_strtoUTF16(*out_path, treename, treename_len, cp);
	UniStrcat(*out_path, sep);
	UniStrcat(*out_path, path);
	unload_nls(cp);

	return 0;
}

Project: linux
File: smb2pdu.c

assemble_neg_contexts(struct smb2_negotiate_req *req,
		      unsigned int *total_len)
{
	char *pneg_ctxt = (char *)req;
	unsigned int ctxt_len;

	if (*total_len > 200) {
		/* In case length corrupted don't want to overrun smb buffer */
		cifs_dbg(VFS, "Bad frame length assembling neg contexts\n");
		return;
	}

	/*
	 * round up total_len of fixed part of SMB3 negotiate request to 8
	 * byte boundary before adding negotiate contexts
	 */
	*total_len = roundup(*total_len, 8);

	pneg_ctxt = (*total_len) + (char *)req;
	req->NegotiateContextOffset = cpu_to_le32(*total_len);

	build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
	ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
	*total_len += ctxt_len;
	pneg_ctxt += ctxt_len;

	build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
	ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
	*total_len += ctxt_len;
	pneg_ctxt += ctxt_len;

	build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
	*total_len += sizeof(struct smb2_posix_neg_context);

	req->NegotiateContextCount = cpu_to_le16(3);
}

Project: linux
File: smb2pdu.c

build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
{
	pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
	pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
	pneg_ctxt->CipherCount = cpu_to_le16(1);
/* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
	pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
}

Project: linux
File: smb2pdu.c

build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
{
	pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
	pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
	pneg_ctxt->Name[0] = 0x93;
	pneg_ctxt->Name[1] = 0xAD;
	pneg_ctxt->Name[2] = 0x25;
	pneg_ctxt->Name[3] = 0x50;
	pneg_ctxt->Name[4] = 0x9C;
	pneg_ctxt->Name[5] = 0xB4;
	pneg_ctxt->Name[6] = 0x11;
	pneg_ctxt->Name[7] = 0xE7;
	pneg_ctxt->Name[8] = 0xB4;
	pneg_ctxt->Name[9] = 0x23;
	pneg_ctxt->Name[10] = 0x83;
	pneg_ctxt->Name[11] = 0xDE;
	pneg_ctxt->Name[12] = 0x96;
	pneg_ctxt->Name[13] = 0x8B;
	pneg_ctxt->Name[14] = 0xCD;
	pneg_ctxt->Name[15] = 0x7C;
}

Project: linux
File: smb2pdu.c

build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
		   int outbuf_len, u64 persistent_fid, u64 volatile_fid)
{
	int rc;
	struct smb2_query_info_req *req;
	unsigned int total_len;

	cifs_dbg(FYI, "Query FSInfo level %d\n", level);

	if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
		return -EIO;

	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	req->InfoType = SMB2_O_INFO_FILESYSTEM;
	req->FileInfoClass = level;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
	/* 1 for pad */
	req->InputBufferOffset =
			cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
	req->OutputBufferLength = cpu_to_le32(
		outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);

	iov->iov_base = (char *)req;
	iov->iov_len = total_len;
	return 0;
}

Project: linux
File: smb2pdu.c

copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
			struct kstatfs *kst)
{
	kst->f_bsize = le32_to_cpu(response_data->BlockSize);
	kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
	kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
	if (response_data->UserBlocksAvail == cpu_to_le64(-1))
		kst->f_bavail = kst->f_bfree;
	else
		kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
	if (response_data->TotalFileNodes != cpu_to_le64(-1))
		kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
	if (response_data->FreeFileNodes != cpu_to_le64(-1))
		kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);

	return;
}

Project: linux
File: smb2pdu.c

create_durable_v2_buf(struct cifs_open_parms *oparms)
{
	struct cifs_fid *pfid = oparms->fid;
	struct create_durable_v2 *buf;

	buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->ccontext.DataOffset = cpu_to_le16(offsetof
					(struct create_durable_v2, dcontext));
	buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
	buf->ccontext.NameOffset = cpu_to_le16(offsetof
				(struct create_durable_v2, Name));
	buf->ccontext.NameLength = cpu_to_le16(4);

	/*
	 * NB: Handle timeout defaults to 0, which allows server to choose
	 * (most servers default to 120 seconds) and most clients default to 0.
	 * This can be overridden at mount ("handletimeout=") if the user wants
	 * a different persistent (or resilient) handle timeout for all opens
	 * opens on a particular SMB3 mount.
	 */
	buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
	buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
	generate_random_uuid(buf->dcontext.CreateGuid);
	memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);

	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = '2';
	buf->Name[3] = 'Q';
	return buf;
}

Project: linux
File: smb2pdu.c

create_posix_buf(umode_t mode)
{
	struct create_posix *buf;

	buf = kzalloc(sizeof(struct create_posix),
			GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->ccontext.DataOffset =
		cpu_to_le16(offsetof(struct create_posix, Mode));
	buf->ccontext.DataLength = cpu_to_le32(4);
	buf->ccontext.NameOffset =
		cpu_to_le16(offsetof(struct create_posix, Name));
	buf->ccontext.NameLength = cpu_to_le16(16);

	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
	buf->Name[0] = 0x93;
	buf->Name[1] = 0xAD;
	buf->Name[2] = 0x25;
	buf->Name[3] = 0x50;
	buf->Name[4] = 0x9C;
	buf->Name[5] = 0xB4;
	buf->Name[6] = 0x11;
	buf->Name[7] = 0xE7;
	buf->Name[8] = 0xB4;
	buf->Name[9] = 0x23;
	buf->Name[10] = 0x83;
	buf->Name[11] = 0xDE;
	buf->Name[12] = 0x96;
	buf->Name[13] = 0x8B;
	buf->Name[14] = 0xCD;
	buf->Name[15] = 0x7C;
	buf->Mode = cpu_to_le32(mode);
	cifs_dbg(FYI, "mode on posix create 0%o", mode);
	return buf;
}

Project: linux
File: smb2pdu.c

create_twarp_buf(__u64 timewarp)
{
	struct crt_twarp_ctxt *buf;

	buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->ccontext.DataOffset = cpu_to_le16(offsetof
					(struct crt_twarp_ctxt, Timestamp));
	buf->ccontext.DataLength = cpu_to_le32(8);
	buf->ccontext.NameOffset = cpu_to_le16(offsetof
				(struct crt_twarp_ctxt, Name));
	buf->ccontext.NameLength = cpu_to_le16(4);
	/* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
	buf->Name[0] = 'T';
	buf->Name[1] = 'W';
	buf->Name[2] = 'r';
	buf->Name[3] = 'p';
	buf->Timestamp = cpu_to_le64(timewarp);
	return buf;
}

Project: linux
File: smb2pdu.c

static int decode_encrypt_ctx(struct TCP_Server_Info *server,
			      struct smb2_encryption_neg_context *ctxt)
{
	unsigned int len = le16_to_cpu(ctxt->DataLength);

	cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
	if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
		printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
		return -EINVAL;
	}

	if (le16_to_cpu(ctxt->CipherCount) != 1) {
		printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
		return -EINVAL;
	}
	cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
	if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
	    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
		printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
		return -EINVAL;
	}
	server->cipher_type = ctxt->Ciphers[0];
	server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
	return 0;
}

Project: linux
File: smb2pdu.c

static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
{
	unsigned int len = le16_to_cpu(ctxt->DataLength);

	/* If invalid preauth context warn but use what we requested, SHA-512 */
	if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
		printk_once(KERN_WARNING "server sent bad preauth context\n");
		return;
	}
	if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
		printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
	if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
		printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
}

Project: linux
File: smb2pdu.c

query_info(const unsigned int xid, struct cifs_tcon *tcon,
	   u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
	   u32 additional_info, size_t output_len, size_t min_len, void **data,
		u32 *dlen)
{
	struct smb_rqst rqst;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int rc = 0;
	int resp_buftype = CIFS_NO_BUFFER;
	struct cifs_ses *ses = tcon->ses;
	int flags = 0;
	bool allocated = false;

	cifs_dbg(FYI, "Query Info\n");

	if (!ses || !(ses->server))
		return -EIO;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	memset(&iov, 0, sizeof(iov));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
				  info_class, info_type, additional_info,
				  output_len, 0, NULL);
	if (rc)
		goto qinf_exit;

	trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
				    ses->Suid, info_class, (__u32)info_type);

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
				ses->Suid, info_class, (__u32)info_type, rc);
		goto qinf_exit;
	}

	trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
				ses->Suid, info_class, (__u32)info_type);

	if (dlen) {
		*dlen = le32_to_cpu(rsp->OutputBufferLength);
		if (!*data) {
			*data = kmalloc(*dlen, GFP_KERNEL);
			if (!*data) {
				cifs_dbg(VFS,
					"Error %d allocating memory for acl\n",
					rc);
				*dlen = 0;
				rc = -ENOMEM;
				goto qinf_exit;
			}
			allocated = true;
		}
	}

	rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
					le32_to_cpu(rsp->OutputBufferLength),
					&rsp_iov, min_len, *data);
	if (rc && allocated) {
		kfree(*data);
		*data = NULL;
		*dlen = 0;
	}

qinf_exit:
	SMB2_query_info_free(&rqst);
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

Project: linux
File: smb2pdu.c

send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
	       u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
	       u8 info_type, u32 additional_info, unsigned int num,
		void **data, unsigned int *size)
{
	struct smb_rqst rqst;
	struct smb2_set_info_rsp *rsp = NULL;
	struct kvec *iov;
	struct kvec rsp_iov;
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
	int flags = 0;

	if (!ses || !(ses->server))
		return -EIO;

	if (!num)
		return -EINVAL;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
	if (!iov)
		return -ENOMEM;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = num;

	rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
				info_class, info_type, additional_info,
				data, size);
	if (rc) {
		kfree(iov);
		return rc;
	}


	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
			    &rsp_iov);
	SMB2_set_info_free(&rqst);
	rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
		trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
				ses->Suid, info_class, (__u32)info_type, rc);
	}

	free_rsp_buf(resp_buftype, rsp);
	kfree(iov);
	return rc;
}

Project: linux
File: smb2pdu.c

smb2_async_writev(struct cifs_writedata *wdata,
		  void (*release)(struct kref *kref))
{
	int rc = -EACCES, flags = 0;
	struct smb2_write_req *req = NULL;
	struct smb2_sync_hdr *shdr;
	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
	struct TCP_Server_Info *server = tcon->ses->server;
	struct kvec iov[1];
	struct smb_rqst rqst = { };
	unsigned int total_len;

	rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	shdr = (struct smb2_sync_hdr *)req;
	shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);

	req->PersistentFileId = wdata->cfile->fid.persistent_fid;
	req->VolatileFileId = wdata->cfile->fid.volatile_fid;
	req->WriteChannelInfoOffset = 0;
	req->WriteChannelInfoLength = 0;
	req->Channel = 0;
	req->Offset = cpu_to_le64(wdata->offset);
	req->DataOffset = cpu_to_le16(
				offsetof(struct smb2_write_req, Buffer));
	req->RemainingBytes = 0;

	trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
		tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
#ifdef CONFIG_CIFS_SMB_DIRECT
	/*
	 * If we want to do a server RDMA read, fill in and append
	 * smbd_buffer_descriptor_v1 to the end of write request
	 */
	if (server->rdma && !server->sign && wdata->bytes >=
		server->smbd_conn->rdma_readwrite_threshold) {

		struct smbd_buffer_descriptor_v1 *v1;
		bool need_invalidate = server->dialect == SMB30_PROT_ID;

		wdata->mr = smbd_register_mr(
				server->smbd_conn, wdata->pages,
				wdata->nr_pages, wdata->page_offset,
				wdata->tailsz, false, need_invalidate);
		if (!wdata->mr) {
			rc = -ENOBUFS;
			goto async_writev_out;
		}
		req->Length = 0;
		req->DataOffset = 0;
		if (wdata->nr_pages > 1)
			req->RemainingBytes =
				cpu_to_le32(
					(wdata->nr_pages - 1) * wdata->pagesz -
					wdata->page_offset + wdata->tailsz
				);
		else
			req->RemainingBytes = cpu_to_le32(wdata->tailsz);
		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
		if (need_invalidate)
			req->Channel = SMB2_CHANNEL_RDMA_V1;
		req->WriteChannelInfoOffset =
			cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
		req->WriteChannelInfoLength =
			cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
		v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
		v1->offset = cpu_to_le64(wdata->mr->mr->iova);
		v1->token = cpu_to_le32(wdata->mr->mr->rkey);
		v1->length = cpu_to_le32(wdata->mr->mr->length);
	}
#endif
	iov[0].iov_len = total_len - 1;
	iov[0].iov_base = (char *)req;

	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;
	rqst.rq_pages = wdata->pages;
	rqst.rq_offset = wdata->page_offset;
	rqst.rq_npages = wdata->nr_pages;
	rqst.rq_pagesz = wdata->pagesz;
	rqst.rq_tailsz = wdata->tailsz;
#ifdef CONFIG_CIFS_SMB_DIRECT
	if (wdata->mr) {
		iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
		rqst.rq_npages = 0;
	}
#endif
	cifs_dbg(FYI, "async write at %llu %u bytes\n",
		 wdata->offset, wdata->bytes);

#ifdef CONFIG_CIFS_SMB_DIRECT
	/* For RDMA read, I/O size is in RemainingBytes not in Length */
	if (!wdata->mr)
		req->Length = cpu_to_le32(wdata->bytes);
#else
	req->Length = cpu_to_le32(wdata->bytes);
#endif

	if (wdata->credits.value > 0) {
		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
						    SMB2_MAX_BUFFER_SIZE));
		shdr->CreditRequest =
			cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);

		rc = adjust_credits(server, &wdata->credits, wdata->bytes);
		if (rc)
			goto async_writev_out;

		flags |= CIFS_HAS_CREDITS;
	}

	kref_get(&wdata->refcount);
	rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
			     wdata, flags, &wdata->credits);

	if (rc) {
		trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
				     tcon->tid, tcon->ses->Suid, wdata->offset,
				     wdata->bytes, rc);
		kref_put(&wdata->refcount, release);
		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
	}

async_writev_out:
	cifs_small_buf_release(req);
	return rc;
}

Project: linux
File: smb2pdu.c

smb2_echo_callback(struct mid_q_entry *mid)
{
	struct TCP_Server_Info *server = mid->callback_data;
	struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
	struct cifs_credits credits = { .value = 0, .instance = 0 };

	if (mid->mid_state == MID_RESPONSE_RECEIVED
	    || mid->mid_state == MID_RESPONSE_MALFORMED) {
		credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
		credits.instance = server->reconnect_instance;
	}

	DeleteMidQEntry(mid);
	add_credits(server, &credits, CIFS_ECHO_OP);
}

Project: linux
File: smb2pdu.c

smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
		  const struct cifs_tcon *tcon)
{
	shdr->ProtocolId = SMB2_PROTO_NUMBER;
	shdr->StructureSize = cpu_to_le16(64);
	shdr->Command = smb2_cmd;
	if (tcon && tcon->ses && tcon->ses->server) {
		struct TCP_Server_Info *server = tcon->ses->server;

		spin_lock(&server->req_lock);
		/* Request up to 10 credits but don't go over the limit. */
		if (server->credits >= server->max_credits)
			shdr->CreditRequest = cpu_to_le16(0);
		else
			shdr->CreditRequest = cpu_to_le16(
				min_t(int, server->max_credits -
						server->credits, 10));
		spin_unlock(&server->req_lock);
	} else {
		shdr->CreditRequest = cpu_to_le16(2);
	}
	shdr->ProcessId = cpu_to_le32((__u16)current->tgid);

	if (!tcon)
		goto out;

	/* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
	/* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
	if ((tcon->ses) && (tcon->ses->server) &&
	    (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
		shdr->CreditCharge = cpu_to_le16(1);
	/* else CreditCharge MBZ */

	shdr->TreeId = tcon->tid;
	/* Uid is not converted */
	if (tcon->ses)
		shdr->SessionId = tcon->ses->Suid;

	/*
	 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
	 * to pass the path on the Open SMB prefixed by \\server\share.
	 * Not sure when we would need to do the augmented path (if ever) and
	 * setting this flag breaks the SMB2 open operation since it is
	 * illegal to send an empty path name (without \\server\share prefix)
	 * when the DFS flag is set in the SMB open header. We could
	 * consider setting the flag on all operations other than open
	 * but it is safer to net set it for now.
	 */
/*	if (tcon->share_flags & SHI1005_FLAGS_DFS)
		shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */

	if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
	    !smb3_encryption_required(tcon))
		shdr->Flags |= SMB2_FLAGS_SIGNED;
out:
	return;
}

Project: linux
File: smb2pdu.c

smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
	   const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
	   const __u32 num_lock, struct smb2_lock_element *buf)
{
	struct smb_rqst rqst;
	int rc = 0;
	struct smb2_lock_req *req = NULL;
	struct kvec iov[2];
	struct kvec rsp_iov;
	int resp_buf_type;
	unsigned int count;
	int flags = CIFS_NO_RESP;
	unsigned int total_len;

	cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);

	rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	req->sync_hdr.ProcessId = cpu_to_le32(pid);
	req->LockCount = cpu_to_le16(num_lock);

	req->PersistentFileId = persist_fid;
	req->VolatileFileId = volatile_fid;

	count = num_lock * sizeof(struct smb2_lock_element);

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
	iov[1].iov_base = (char *)buf;
	iov[1].iov_len = count;

	cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 2;

	rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
			    &rsp_iov);
	cifs_small_buf_release(req);
	if (rc) {
		cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
		cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
		trace_smb3_lock_err(xid, persist_fid, tcon->tid,
				    tcon->ses->Suid, rc);
	}

	return rc;
}

Project: linux
File: smb2pdu.c

smb2_new_read_req(void **buf, unsigned int *total_len,
	struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
	unsigned int remaining_bytes, int request_type)
{
	int rc = -EACCES;
	struct smb2_read_plain_req *req = NULL;
	struct smb2_sync_hdr *shdr;
	struct TCP_Server_Info *server;

	rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
				 total_len);
	if (rc)
		return rc;

	server = io_parms->tcon->ses->server;
	if (server == NULL)
		return -ECONNABORTED;

	shdr = &req->sync_hdr;
	shdr->ProcessId = cpu_to_le32(io_parms->pid);

	req->PersistentFileId = io_parms->persistent_fid;
	req->VolatileFileId = io_parms->volatile_fid;
	req->ReadChannelInfoOffset = 0; /* reserved */
	req->ReadChannelInfoLength = 0; /* reserved */
	req->Channel = 0; /* reserved */
	req->MinimumCount = 0;
	req->Length = cpu_to_le32(io_parms->length);
	req->Offset = cpu_to_le64(io_parms->offset);

	trace_smb3_read_enter(0 /* xid */,
			io_parms->persistent_fid,
			io_parms->tcon->tid, io_parms->tcon->ses->Suid,
			io_parms->offset, io_parms->length);
#ifdef CONFIG_CIFS_SMB_DIRECT
	/*
	 * If we want to do a RDMA write, fill in and append
	 * smbd_buffer_descriptor_v1 to the end of read request
	 */
	if (server->rdma && rdata && !server->sign &&
		rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {

		struct smbd_buffer_descriptor_v1 *v1;
		bool need_invalidate =
			io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;

		rdata->mr = smbd_register_mr(
				server->smbd_conn, rdata->pages,
				rdata->nr_pages, rdata->page_offset,
				rdata->tailsz, true, need_invalidate);
		if (!rdata->mr)
			return -ENOBUFS;

		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
		if (need_invalidate)
			req->Channel = SMB2_CHANNEL_RDMA_V1;
		req->ReadChannelInfoOffset =
			cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
		req->ReadChannelInfoLength =
			cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
		v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
		v1->offset = cpu_to_le64(rdata->mr->mr->iova);
		v1->token = cpu_to_le32(rdata->mr->mr->rkey);
		v1->length = cpu_to_le32(rdata->mr->mr->length);

		*total_len += sizeof(*v1) - 1;
	}
#endif
	if (request_type & CHAINED_REQUEST) {
		if (!(request_type & END_OF_CHAIN)) {
			/* next 8-byte aligned request */
			*total_len = DIV_ROUND_UP(*total_len, 8) * 8;
			shdr->NextCommand = cpu_to_le32(*total_len);
		} else /* END_OF_CHAIN */
			shdr->NextCommand = 0;
		if (request_type & RELATED_REQUEST) {
			shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
			/*
			 * Related requests use info from previous read request
			 * in chain.
			 */
			shdr->SessionId = 0xFFFFFFFF;
			shdr->TreeId = 0xFFFFFFFF;
			req->PersistentFileId = 0xFFFFFFFF;
			req->VolatileFileId = 0xFFFFFFFF;
		}
	}
	if (remaining_bytes > io_parms->length)
		req->RemainingBytes = cpu_to_le32(remaining_bytes);
	else
		req->RemainingBytes = 0;

	*buf = req;
	return rc;
}

Project: linux
File: smb2pdu.c

smb2_parse_lease_state(struct TCP_Server_Info *server,
		       struct smb2_create_rsp *rsp,
		       unsigned int *epoch, char *lease_key)
{
	char *data_offset;
	struct create_context *cc;
	unsigned int next;
	unsigned int remaining;
	char *name;

	data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
	remaining = le32_to_cpu(rsp->CreateContextsLength);
	cc = (struct create_context *)data_offset;
	while (remaining >= sizeof(struct create_context)) {
		name = le16_to_cpu(cc->NameOffset) + (char *)cc;
		if (le16_to_cpu(cc->NameLength) == 4 &&
		    strncmp(name, "RqLs", 4) == 0)
			return server->ops->parse_lease_buf(cc, epoch,
							    lease_key);

		next = le32_to_cpu(cc->Next);
		if (!next)
			break;
		remaining -= next;
		cc = (struct create_context *)((char *)cc + next);
	}

	return 0;
}

Project: linux
File: smb2pdu.c

smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
		    void **request_buf, unsigned int *total_len)
{
	int rc;

	rc = smb2_reconnect(smb2_command, tcon);
	if (rc)
		return rc;

	/* BB eventually switch this to SMB2 specific small buf size */
	if (smb2_command == SMB2_SET_INFO)
		*request_buf = cifs_buf_get();
	else
		*request_buf = cifs_small_buf_get();
	if (*request_buf == NULL) {
		/* BB should we add a retry in here if not a writepage? */
		return -ENOMEM;
	}

	fill_small_buf(smb2_command, tcon,
		       (struct smb2_sync_hdr *)(*request_buf),
		       total_len);

	if (tcon != NULL) {
		uint16_t com_code = le16_to_cpu(smb2_command);
		cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
		cifs_stats_inc(&tcon->num_smbs_sent);
	}

	return rc;
}

Project: linux
File: smb2pdu.c

smb2_readv_callback(struct mid_q_entry *mid)
{
	struct cifs_readdata *rdata = mid->callback_data;
	struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
	struct TCP_Server_Info *server = tcon->ses->server;
	struct smb2_sync_hdr *shdr =
				(struct smb2_sync_hdr *)rdata->iov[0].iov_base;
	struct cifs_credits credits = { .value = 0, .instance = 0 };
	struct smb_rqst rqst = { .rq_iov = rdata->iov,
				 .rq_nvec = 2,
				 .rq_pages = rdata->pages,
				 .rq_offset = rdata->page_offset,
				 .rq_npages = rdata->nr_pages,
				 .rq_pagesz = rdata->pagesz,
				 .rq_tailsz = rdata->tailsz };

	cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
		 __func__, mid->mid, mid->mid_state, rdata->result,
		 rdata->bytes);

	switch (mid->mid_state) {
	case MID_RESPONSE_RECEIVED:
		credits.value = le16_to_cpu(shdr->CreditRequest);
		credits.instance = server->reconnect_instance;
		/* result already set, check signature */
		if (server->sign && !mid->decrypted) {
			int rc;

			rc = smb2_verify_signature(&rqst, server);
			if (rc)
				cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
					 rc);
		}
		/* FIXME: should this be counted toward the initiating task? */
		task_io_account_read(rdata->got_bytes);
		cifs_stats_bytes_read(tcon, rdata->got_bytes);
		break;
	case MID_REQUEST_SUBMITTED:
	case MID_RETRY_NEEDED:
		rdata->result = -EAGAIN;
		if (server->sign && rdata->got_bytes)
			/* reset bytes number since we can not check a sign */
			rdata->got_bytes = 0;
		/* FIXME: should this be counted toward the initiating task? */
		task_io_account_read(rdata->got_bytes);
		cifs_stats_bytes_read(tcon, rdata->got_bytes);
		break;
	case MID_RESPONSE_MALFORMED:
		credits.value = le16_to_cpu(shdr->CreditRequest);
		credits.instance = server->reconnect_instance;
		/* fall through */
	default:
		rdata->result = -EIO;
	}
#ifdef CONFIG_CIFS_SMB_DIRECT
	/*
	 * If this rdata has a memmory registered, the MR can be freed
	 * MR needs to be freed as soon as I/O finishes to prevent deadlock
	 * because they have limited number and are used for future I/Os
	 */
	if (rdata->mr) {
		smbd_deregister_mr(rdata->mr);
		rdata->mr = NULL;
	}
#endif
	if (rdata->result && rdata->result != -ENODATA) {
		cifs_stats_fail_inc(tcon, SMB2_READ_HE);
		trace_smb3_read_err(0 /* xid */,
				    rdata->cfile->fid.persistent_fid,
				    tcon->tid, tcon->ses->Suid, rdata->offset,
				    rdata->bytes, rdata->result);
	} else
		trace_smb3_read_done(0 /* xid */,
				     rdata->cfile->fid.persistent_fid,
				     tcon->tid, tcon->ses->Suid,
				     rdata->offset, rdata->got_bytes);

	queue_work(cifsiod_wq, &rdata->work);
	DeleteMidQEntry(mid);
	add_credits(server, &credits, 0);
}

Project: linux
File: smb2pdu.c

smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
{
	int rc;
	struct nls_table *nls_codepage;
	struct cifs_ses *ses;
	struct TCP_Server_Info *server;
	int retries;

	/*
	 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
	 * check for tcp and smb session status done differently
	 * for those three - in the calling routine.
	 */
	if (tcon == NULL)
		return 0;

	if (smb2_command == SMB2_TREE_CONNECT)
		return 0;

	if (tcon->tidStatus == CifsExiting) {
		/*
		 * only tree disconnect, open, and write,
		 * (and ulogoff which does not have tcon)
		 * are allowed as we start force umount.
		 */
		if ((smb2_command != SMB2_WRITE) &&
		   (smb2_command != SMB2_CREATE) &&
		   (smb2_command != SMB2_TREE_DISCONNECT)) {
			cifs_dbg(FYI, "can not send cmd %d while umounting\n",
				 smb2_command);
			return -ENODEV;
		}
	}
	if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
	    (!tcon->ses->server))
		return -EIO;

	ses = tcon->ses;
	server = ses->server;

	retries = server->nr_targets;

	/*
	 * Give demultiplex thread up to 10 seconds to each target available for
	 * reconnect -- should be greater than cifs socket timeout which is 7
	 * seconds.
	 */
	while (server->tcpStatus == CifsNeedReconnect) {
		/*
		 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
		 * here since they are implicitly done when session drops.
		 */
		switch (smb2_command) {
		/*
		 * BB Should we keep oplock break and add flush to exceptions?
		 */
		case SMB2_TREE_DISCONNECT:
		case SMB2_CANCEL:
		case SMB2_CLOSE:
		case SMB2_OPLOCK_BREAK:
			return -EAGAIN;
		}

		rc = wait_event_interruptible_timeout(server->response_q,
						      (server->tcpStatus != CifsNeedReconnect),
						      10 * HZ);
		if (rc < 0) {
			cifs_dbg(FYI, "%s: aborting reconnect due to a received"
				 " signal by the process\n", __func__);
			return -ERESTARTSYS;
		}

		/* are we still trying to reconnect? */
		if (server->tcpStatus != CifsNeedReconnect)
			break;

		if (--retries)
			continue;

		/*
		 * on "soft" mounts we wait once. Hard mounts keep
		 * retrying until process is killed or server comes
		 * back on-line
		 */
		if (!tcon->retry) {
			cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
			return -EHOSTDOWN;
		}
		retries = server->nr_targets;
	}

	if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
		return 0;

	nls_codepage = load_nls_default();

	/*
	 * need to prevent multiple threads trying to simultaneously reconnect
	 * the same SMB session
	 */
	mutex_lock(&tcon->ses->session_mutex);

	/*
	 * Recheck after acquire mutex. If another thread is negotiating
	 * and the server never sends an answer the socket will be closed
	 * and tcpStatus set to reconnect.
	 */
	if (server->tcpStatus == CifsNeedReconnect) {
		rc = -EHOSTDOWN;
		mutex_unlock(&tcon->ses->session_mutex);
		goto out;
	}

	rc = cifs_negotiate_protocol(0, tcon->ses);
	if (!rc && tcon->ses->need_reconnect)
		rc = cifs_setup_session(0, tcon->ses, nls_codepage);

	if (rc || !tcon->need_reconnect) {
		mutex_unlock(&tcon->ses->session_mutex);
		goto out;
	}

	cifs_mark_open_files_invalid(tcon);
	if (tcon->use_persistent)
		tcon->need_reopen_files = true;

	rc = __smb2_reconnect(nls_codepage, tcon);
	mutex_unlock(&tcon->ses->session_mutex);

	cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
	if (rc) {
		/* If sess reconnected but tcon didn't, something strange ... */
		printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
		goto out;
	}

	if (smb2_command != SMB2_INTERNAL_CMD)
		queue_delayed_work(cifsiod_wq, &server->reconnect, 0);

	atomic_inc(&tconInfoReconnectCount);
out:
	/*
	 * Check if handle based operation so we know whether we can continue
	 * or not without returning to caller to reset file handle.
	 */
	/*
	 * BB Is flush done by server on drop of tcp session? Should we special
	 * case it and skip above?
	 */
	switch (smb2_command) {
	case SMB2_FLUSH:
	case SMB2_READ:
	case SMB2_WRITE:
	case SMB2_LOCK:
	case SMB2_IOCTL:
	case SMB2_QUERY_DIRECTORY:
	case SMB2_CHANGE_NOTIFY:
	case SMB2_QUERY_INFO:
	case SMB2_SET_INFO:
		rc = -EAGAIN;
	}
	unload_nls(nls_codepage);
	return rc;
}

Project: linux
File: smb2pdu.c

void smb2_reconnect_server(struct work_struct *work)
{
	struct TCP_Server_Info *server = container_of(work,
					struct TCP_Server_Info, reconnect.work);
	struct cifs_ses *ses;
	struct cifs_tcon *tcon, *tcon2;
	struct list_head tmp_list;
	int tcon_exist = false;
	int rc;
	int resched = false;


	/* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
	mutex_lock(&server->reconnect_mutex);

	INIT_LIST_HEAD(&tmp_list);
	cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");

	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) {
			if (tcon->need_reconnect || tcon->need_reopen_files) {
				tcon->tc_count++;
				list_add_tail(&tcon->rlist, &tmp_list);
				tcon_exist = true;
			}
		}
		if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
			list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
			tcon_exist = true;
		}
	}
	/*
	 * Get the reference to server struct to be sure that the last call of
	 * cifs_put_tcon() in the loop below won't release the server pointer.
	 */
	if (tcon_exist)
		server->srv_count++;

	spin_unlock(&cifs_tcp_ses_lock);

	list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
		rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
		if (!rc)
			cifs_reopen_persistent_handles(tcon);
		else
			resched = true;
		list_del_init(&tcon->rlist);
		cifs_put_tcon(tcon);
	}

	cifs_dbg(FYI, "Reconnecting tcons finished\n");
	if (resched)
		queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
	mutex_unlock(&server->reconnect_mutex);

	/* now we can safely release srv struct */
	if (tcon_exist)
		cifs_put_tcp_session(server, 1);
}

Project: linux
File: smb2pdu.c

smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
{
	switch (requested) {
	case Kerberos:
	case RawNTLMSSP:
		return requested;
	case NTLMv2:
		return RawNTLMSSP;
	case Unspecified:
		if (server->sec_ntlmssp &&
			(global_secflags & CIFSSEC_MAY_NTLMSSP))
			return RawNTLMSSP;
		if ((server->sec_kerberos || server->sec_mskerberos) &&
			(global_secflags & CIFSSEC_MAY_KRB5))
			return Kerberos;
		/* Fallthrough */
	default:
		return Unspecified;
	}
}

Project: linux
File: smb2pdu.c

smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
			   struct kvec *iov, unsigned int minbufsize,
			   char *data)
{
	char *begin_of_buf = offset + (char *)iov->iov_base;
	int rc;

	if (!data)
		return -EINVAL;

	rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
	if (rc)
		return rc;

	memcpy(data, begin_of_buf, buffer_length);

	return 0;
}

Project: linux
File: smb2pdu.c

smb2_writev_callback(struct mid_q_entry *mid)
{
	struct cifs_writedata *wdata = mid->callback_data;
	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
	struct TCP_Server_Info *server = tcon->ses->server;
	unsigned int written;
	struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
	struct cifs_credits credits = { .value = 0, .instance = 0 };

	switch (mid->mid_state) {
	case MID_RESPONSE_RECEIVED:
		credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
		credits.instance = server->reconnect_instance;
		wdata->result = smb2_check_receive(mid, server, 0);
		if (wdata->result != 0)
			break;

		written = le32_to_cpu(rsp->DataLength);
		/*
		 * Mask off high 16 bits when bytes written as returned
		 * by the server is greater than bytes requested by the
		 * client. OS/2 servers are known to set incorrect
		 * CountHigh values.
		 */
		if (written > wdata->bytes)
			written &= 0xFFFF;

		if (written < wdata->bytes)
			wdata->result = -ENOSPC;
		else
			wdata->bytes = written;
		break;
	case MID_REQUEST_SUBMITTED:
	case MID_RETRY_NEEDED:
		wdata->result = -EAGAIN;
		break;
	case MID_RESPONSE_MALFORMED:
		credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
		credits.instance = server->reconnect_instance;
		/* fall through */
	default:
		wdata->result = -EIO;
		break;
	}
#ifdef CONFIG_CIFS_SMB_DIRECT
	/*
	 * If this wdata has a memory registered, the MR can be freed
	 * The number of MRs available is limited, it's important to recover
	 * used MR as soon as I/O is finished. Hold MR longer in the later
	 * I/O process can possibly result in I/O deadlock due to lack of MR
	 * to send request on I/O retry
	 */
	if (wdata->mr) {
		smbd_deregister_mr(wdata->mr);
		wdata->mr = NULL;
	}
#endif
	if (wdata->result) {
		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
		trace_smb3_write_err(0 /* no xid */,
				     wdata->cfile->fid.persistent_fid,
				     tcon->tid, tcon->ses->Suid, wdata->offset,
				     wdata->bytes, wdata->result);
	} else
		trace_smb3_write_done(0 /* no xid */,
				      wdata->cfile->fid.persistent_fid,
				      tcon->tid, tcon->ses->Suid,
				      wdata->offset, wdata->bytes);

	queue_work(cifsiod_wq, &wdata->work);
	DeleteMidQEntry(mid);
	add_credits(server, &credits, 0);
}

Project: linux
File: smb2pdu.c

static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
				     struct TCP_Server_Info *server,
				     unsigned int len_of_smb)
{
	struct smb2_neg_context *pctx;
	unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
	unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
	unsigned int len_of_ctxts, i;
	int rc = 0;

	cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
	if (len_of_smb <= offset) {
		cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
		return -EINVAL;
	}

	len_of_ctxts = len_of_smb - offset;

	for (i = 0; i < ctxt_cnt; i++) {
		int clen;
		/* check that offset is not beyond end of SMB */
		if (len_of_ctxts == 0)
			break;

		if (len_of_ctxts < sizeof(struct smb2_neg_context))
			break;

		pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
		clen = le16_to_cpu(pctx->DataLength);
		if (clen > len_of_ctxts)
			break;

		if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
			decode_preauth_context(
				(struct smb2_preauth_neg_context *)pctx);
		else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
			rc = decode_encrypt_ctx(server,
				(struct smb2_encryption_neg_context *)pctx);
		else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
			server->posix_ext_supported = true;
		else
			cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
				le16_to_cpu(pctx->ContextType));

		if (rc)
			break;
		/* offsets must be 8 byte aligned */
		clen = (clen + 7) & ~0x7;
		offset += clen + sizeof(struct smb2_neg_context);
		len_of_ctxts -= clen;
	}
	return rc;
}

Project: linux
File: smb2pdu.c

int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
			       umode_t mode, struct cifs_tcon *tcon,
			       const char *full_path,
			       struct cifs_sb_info *cifs_sb)
{
	struct smb_rqst rqst;
	struct smb2_create_req *req;
	struct smb2_create_rsp *rsp = NULL;
	struct cifs_ses *ses = tcon->ses;
	struct kvec iov[3]; /* make sure at least one for each open context */
	struct kvec rsp_iov = {NULL, 0};
	int resp_buftype;
	int uni_path_len;
	__le16 *copy_path = NULL;
	int copy_size;
	int rc = 0;
	unsigned int n_iov = 2;
	__u32 file_attributes = 0;
	char *pc_buf = NULL;
	int flags = 0;
	unsigned int total_len;
	__le16 *utf16_path = NULL;

	cifs_dbg(FYI, "mkdir\n");

	/* resource #1: path allocation */
	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
	if (!utf16_path)
		return -ENOMEM;

	if (!ses || !(ses->server)) {
		rc = -EIO;
		goto err_free_path;
	}

	/* resource #2: request */
	rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
	if (rc)
		goto err_free_path;


	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	req->ImpersonationLevel = IL_IMPERSONATION;
	req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
	/* File attributes ignored on open (used in create though) */
	req->FileAttributes = cpu_to_le32(file_attributes);
	req->ShareAccess = FILE_SHARE_ALL_LE;
	req->CreateDisposition = cpu_to_le32(FILE_CREATE);
	req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);

	iov[0].iov_base = (char *)req;
	/* -1 since last byte is buf[0] which is sent below (path) */
	iov[0].iov_len = total_len - 1;

	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));

	/* [MS-SMB2] 2.2.13 NameOffset:
	 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
	 * the SMB2 header, the file name includes a prefix that will
	 * be processed during DFS name normalization as specified in
	 * section 3.3.5.9. Otherwise, the file name is relative to
	 * the share that is identified by the TreeId in the SMB2
	 * header.
	 */
	if (tcon->share_flags & SHI1005_FLAGS_DFS) {
		int name_len;

		req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
		rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
						 &name_len,
						 tcon->treeName, utf16_path);
		if (rc)
			goto err_free_req;

		req->NameLength = cpu_to_le16(name_len * 2);
		uni_path_len = copy_size;
		/* free before overwriting resource */
		kfree(utf16_path);
		utf16_path = copy_path;
	} else {
		uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
		/* MUST set path len (NameLength) to 0 opening root of share */
		req->NameLength = cpu_to_le16(uni_path_len - 2);
		if (uni_path_len % 8 != 0) {
			copy_size = roundup(uni_path_len, 8);
			copy_path = kzalloc(copy_size, GFP_KERNEL);
			if (!copy_path) {
				rc = -ENOMEM;
				goto err_free_req;
			}
			memcpy((char *)copy_path, (const char *)utf16_path,
			       uni_path_len);
			uni_path_len = copy_size;
			/* free before overwriting resource */
			kfree(utf16_path);
			utf16_path = copy_path;
		}
	}

	iov[1].iov_len = uni_path_len;
	iov[1].iov_base = utf16_path;
	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;

	if (tcon->posix_extensions) {
		/* resource #3: posix buf */
		rc = add_posix_context(iov, &n_iov, mode);
		if (rc)
			goto err_free_req;
		pc_buf = iov[n_iov-1].iov_base;
	}


	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = n_iov;

	trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
				    FILE_WRITE_ATTRIBUTES);
	/* resource #4: response buffer */
	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
		trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
					   CREATE_NOT_FILE,
					   FILE_WRITE_ATTRIBUTES, rc);
		goto err_free_rsp_buf;
	}

	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
	trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
				    ses->Suid, CREATE_NOT_FILE,
				    FILE_WRITE_ATTRIBUTES);

	SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);

	/* Eventually save off posix specific response info and timestaps */

err_free_rsp_buf:
	free_rsp_buf(resp_buftype, rsp);
	kfree(pc_buf);
err_free_req:
	cifs_small_buf_release(req);
err_free_path:
	kfree(utf16_path);
	return rc;
}

Project: linux
File: smb2pdu.c

int smb3_encryption_required(const struct cifs_tcon *tcon)
{
	if (!tcon)
		return 0;
	if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
	    (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
		return 1;
	if (tcon->seal &&
	    (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
		return 1;
	return 0;
}