xref: /illumos-gate/usr/src/uts/common/fs/smbsrv/smb_common_transact.c (revision 55f0a249fd3511728b02627190771a4ce4ddf20e)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2018 Nexenta Systems, Inc.  All rights reserved.
 */

#include <smbsrv/smb_kproto.h>
#include <smbsrv/smb_fsops.h>
#include <smbsrv/smb_share.h>
#include <smbsrv/string.h>
#include <smbsrv/nmpipes.h>
#include <smbsrv/mailslot.h>
#include <smb/winioctl.h>

/*
 * count of bytes in server response packet
 * except parameters and data. Note that setup
 * word count is zero.
 */
#define	RESP_HEADER_LEN		24

/*
 * We started by using common functions for transaction/transaction2
 * and transaction_secondary/transaction2_secondary because they
 * are respectively so similar. However, it turned out to be a bad
 * idea because of quirky differences. Be sure if you modify one
 * of these four functions to check and see if the modification should
 * be applied to its peer.
 */

static int smb_trans_ready(smb_xa_t *);
static smb_sdrc_t smb_trans_dispatch(smb_request_t *, smb_xa_t *);
static smb_sdrc_t smb_trans2_dispatch(smb_request_t *, smb_xa_t *);

smb_sdrc_t
smb_pre_transaction(smb_request_t *sr)
{
	DTRACE_SMB_START(op__Transaction, smb_request_t *, sr);
	return (SDRC_SUCCESS);
}

void
smb_post_transaction(smb_request_t *sr)
{
	DTRACE_SMB_DONE(op__Transaction, smb_request_t *, sr);
}

smb_sdrc_t
smb_com_transaction(smb_request_t *sr)
{
	int		rc;
	unsigned char	msrcnt, suwcnt;
	uint16_t	tpscnt, tdscnt, mprcnt, mdrcnt, flags;
	uint16_t	pscnt, psoff, dscnt, dsoff;
	uint32_t	timeo;
	struct smb_xa *xa;
	char *stn;
	int ready;

	if (!STYPE_ISIPC(sr->tid_tree->t_res_type)) {
		smbsr_error(sr, 0, ERRDOS, ERRnoaccess);
		return (SDRC_ERROR);
	}

	rc = smbsr_decode_vwv(sr, SMB_TRANSHDR_ED_FMT,
	    &tpscnt, &tdscnt, &mprcnt, &mdrcnt, &msrcnt, &flags,
	    &timeo, &pscnt, &psoff, &dscnt, &dsoff, &suwcnt);

	if (rc != 0)
		return (SDRC_ERROR);

	xa = smb_xa_create(sr->session, sr, tpscnt, tdscnt, mprcnt, mdrcnt,
	    msrcnt, suwcnt);
	if (xa == NULL) {
		smbsr_error(sr, 0, ERRSRV, ERRnoroom);
		return (SDRC_ERROR);
	}

	/* Should be some alignment stuff here in SMB? */
	if (sr->smb_flg2 & SMB_FLAGS2_UNICODE) {
		rc = smbsr_decode_data(sr, "%.U", sr, &stn);
	} else {
		rc = smbsr_decode_data(sr, "%s", sr,  &stn);
	}
	if (rc != 0) {
		smb_xa_rele(sr->session, xa);
		return (SDRC_ERROR);
	}

	xa->xa_pipe_name = smb_mem_strdup(stn);
	xa->smb_flags  = flags;
	xa->smb_timeout = timeo;
	xa->req_disp_param = pscnt;
	xa->req_disp_data  = dscnt;

	if (smb_mbc_copy(&xa->req_setup_mb, &sr->smb_vwv,
	    sr->smb_vwv.chain_offset, suwcnt * 2)) {
		smb_xa_rele(sr->session, xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}
	if (smb_mbc_copy(&xa->req_param_mb, &sr->command, psoff, pscnt)) {
		smb_xa_rele(sr->session, xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}
	if (smb_mbc_copy(&xa->req_data_mb, &sr->command, dsoff, dscnt)) {
		smb_xa_rele(sr->session, xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}

	ready = smb_trans_ready(xa);

	if (smb_xa_open(xa)) {
		smb_xa_rele(sr->session, xa);
		smbsr_error(sr, 0, ERRSRV, ERRsrverror);
		return (SDRC_ERROR);
	}
	sr->r_xa = xa;

	if (!ready) {
		rc = smbsr_encode_empty_result(sr);
		return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
	}

	if (!smb_xa_complete(xa)) {
		smb_xa_close(xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}

	return (smb_trans_dispatch(sr, xa));
}

smb_sdrc_t
smb_pre_transaction_secondary(smb_request_t *sr)
{
	DTRACE_SMB_START(op__TransactionSecondary, smb_request_t *, sr);
	return (SDRC_SUCCESS);
}

void
smb_post_transaction_secondary(smb_request_t *sr)
{
	DTRACE_SMB_DONE(op__TransactionSecondary, smb_request_t *, sr);
}

smb_sdrc_t
smb_com_transaction_secondary(smb_request_t *sr)
{
	uint16_t tpscnt, tdscnt, pscnt, psdisp;
	uint16_t dscnt, dsoff, dsdisp, psoff;
	smb_xa_t *xa;
	int rc;

	if ((xa = smbsr_lookup_xa(sr)) == 0) {
		smbsr_error(sr, 0, ERRSRV, ERRsrverror);
		return (SDRC_ERROR);
	}

	if (sr->session->signing.flags & SMB_SIGNING_ENABLED) {
		if (smb_sign_check_secondary(sr, xa->reply_seqnum) != 0) {
			smbsr_error(sr, NT_STATUS_ACCESS_DENIED,
			    ERRDOS, ERRnoaccess);
			return (SDRC_ERROR);
		}
	}

	if (xa->smb_com != SMB_COM_TRANSACTION) {
		return (SDRC_DROP_VC);
	}

	rc = smbsr_decode_vwv(sr, SMB_TRANSSHDR_ED_FMT, &tpscnt, &tdscnt,
	    &pscnt, &psoff, &psdisp, &dscnt, &dsoff, &dsdisp);

	if (rc != 0)
		return (SDRC_ERROR);

	mutex_enter(&xa->xa_mutex);
	if (xa->smb_tpscnt > tpscnt)
		xa->smb_tpscnt = tpscnt;
	if (xa->smb_tdscnt > tdscnt)
		xa->smb_tdscnt = tdscnt;
	xa->req_disp_param = psdisp + pscnt;
	xa->req_disp_data  = dsdisp + dscnt;

	/*
	 * The words psdisp, dsdisp, tell us what displacement
	 * into the entire trans parameter and data buffers
	 * where we should put the params & data that are
	 * delivered by this request.  [MS-CIFS] says all the
	 * parameters and data SHOULD be sent sequentially, so
	 * so we can normally reassemble by simply appending.
	 * However, the components MAY come out of order, so
	 * check and set the current offset.  This is rare,
	 * and we might like to know when this happens, so
	 * fire some static dtrace probes when it does.
	 */
	if (xa->req_param_mb.chain_offset != psdisp) {
		DTRACE_PROBE2(trans_param_disp,
		    smb_xa_t *, xa, uint16_t, psdisp);
		xa->req_param_mb.chain_offset = psdisp;
	}
	if (xa->req_data_mb.chain_offset != dsdisp) {
		DTRACE_PROBE2(trans_data_disp,
		    smb_xa_t *, xa, uint16_t, dsdisp);
		xa->req_data_mb.chain_offset = dsdisp;
	}

	if (smb_mbc_copy(&xa->req_param_mb, &sr->command, psoff, pscnt)) {
		mutex_exit(&xa->xa_mutex);
		smb_xa_close(xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}
	if (smb_mbc_copy(&xa->req_data_mb, &sr->command, dsoff, dscnt)) {
		mutex_exit(&xa->xa_mutex);
		smb_xa_close(xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}
	mutex_exit(&xa->xa_mutex);

	if (!smb_trans_ready(xa))
		return (SDRC_NO_REPLY);

	if (!smb_xa_complete(xa))
		return (SDRC_NO_REPLY);

	return (smb_trans_dispatch(sr, xa));
}

smb_sdrc_t
smb_pre_ioctl(smb_request_t *sr)
{
	DTRACE_SMB_START(op__Ioctl, smb_request_t *, sr);
	return (SDRC_SUCCESS);
}

void
smb_post_ioctl(smb_request_t *sr)
{
	DTRACE_SMB_DONE(op__Ioctl, smb_request_t *, sr);
}

smb_sdrc_t
smb_com_ioctl(smb_request_t *sr)
{
	uint16_t fid, category, function, tpscnt, tdscnt, mprcnt;
	uint16_t mdrcnt, pscnt, pdoff, dscnt, dsoff;
	uint32_t timeout;
	int rc;

	rc = smbsr_decode_vwv(sr, "wwwwwwwl2.wwww", &fid, &category, &function,
	    &tpscnt, &tdscnt, &mprcnt, &mdrcnt, &timeout, &pscnt,
	    &pdoff, &dscnt, &dsoff);

	if (rc != 0)
		return (SDRC_ERROR);

	return (SDRC_NOT_IMPLEMENTED);
}

smb_sdrc_t
smb_pre_transaction2(smb_request_t *sr)
{
	DTRACE_SMB_START(op__Transaction2, smb_request_t *, sr);
	return (SDRC_SUCCESS);
}

void
smb_post_transaction2(smb_request_t *sr)
{
	DTRACE_SMB_DONE(op__Transaction2, smb_request_t *, sr);
}

smb_sdrc_t
smb_com_transaction2(struct smb_request *sr)
{
	unsigned char	msrcnt, suwcnt;
	uint16_t	tpscnt, tdscnt, mprcnt, mdrcnt, flags;
	uint16_t	pscnt, psoff, dscnt, dsoff;
	uint32_t	timeo;
	smb_xa_t *xa;
	int ready;
	int rc;

	rc = smbsr_decode_vwv(sr, SMB_TRANSHDR_ED_FMT, &tpscnt, &tdscnt,
	    &mprcnt, &mdrcnt, &msrcnt, &flags, &timeo, &pscnt, &psoff, &dscnt,
	    &dsoff, &suwcnt);

	if (rc != 0)
		return (SDRC_ERROR);

	xa = smb_xa_create(sr->session, sr, tpscnt, tdscnt, mprcnt, mdrcnt,
	    msrcnt, suwcnt);
	if (xa == 0) {
		smbsr_error(sr, 0, ERRSRV, ERRnoroom);
		return (SDRC_ERROR);
	}

	xa->smb_flags  = flags;
	xa->smb_timeout = timeo;
	xa->req_disp_param = pscnt;
	xa->req_disp_data  = dscnt;

	if (smb_mbc_copy(&xa->req_setup_mb, &sr->smb_vwv,
	    sr->smb_vwv.chain_offset, suwcnt*2)) {
		smb_xa_rele(sr->session, xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}
	if (smb_mbc_copy(&xa->req_param_mb, &sr->command, psoff, pscnt)) {
		smb_xa_rele(sr->session, xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}
	if (smb_mbc_copy(&xa->req_data_mb, &sr->command, dsoff, dscnt)) {
		smb_xa_rele(sr->session, xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}

	ready = smb_trans_ready(xa);

	if (smb_xa_open(xa)) {
		smb_xa_rele(sr->session, xa);
		smbsr_error(sr, 0, ERRSRV, ERRsrverror);
		return (SDRC_ERROR);
	}
	sr->r_xa = xa;

	if (!ready) {
		rc = smbsr_encode_empty_result(sr);
		return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
	}

	if (!smb_xa_complete(xa)) {
		smb_xa_close(xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}

	return (smb_trans2_dispatch(sr, xa));
}

smb_sdrc_t
smb_pre_transaction2_secondary(smb_request_t *sr)
{
	DTRACE_SMB_START(op__Transaction2Secondary, smb_request_t *, sr);
	return (SDRC_SUCCESS);
}

void
smb_post_transaction2_secondary(smb_request_t *sr)
{
	DTRACE_SMB_DONE(op__Transaction2Secondary, smb_request_t *, sr);
}

smb_sdrc_t
smb_com_transaction2_secondary(smb_request_t *sr)
{
	uint16_t tpscnt, tdscnt, fid;
	uint16_t pscnt, psoff, psdisp, dscnt, dsoff, dsdisp;
	smb_xa_t *xa;
	int rc;

	if ((xa = smbsr_lookup_xa(sr)) == 0) {
		smbsr_error(sr, 0, ERRSRV, ERRsrverror);
		return (SDRC_ERROR);
	}

	if (sr->session->signing.flags & SMB_SIGNING_ENABLED) {
		if (smb_sign_check_secondary(sr, xa->reply_seqnum) != 0) {
			smbsr_error(sr, NT_STATUS_ACCESS_DENIED,
			    ERRDOS, ERRnoaccess);
			return (SDRC_ERROR);
		}
	}

	if (xa->smb_com != SMB_COM_TRANSACTION2) {
		return (SDRC_DROP_VC);
	}

	rc = smbsr_decode_vwv(sr, SMB_TRANS2SHDR_ED_FMT, &tpscnt, &tdscnt,
	    &pscnt, &psoff, &psdisp, &dscnt, &dsoff, &dsdisp, &fid);

	if (rc != 0)
		return (SDRC_ERROR);

	mutex_enter(&xa->xa_mutex);
	if (xa->smb_tpscnt > tpscnt)
		xa->smb_tpscnt = tpscnt;
	if (xa->smb_tdscnt > tdscnt)
		xa->smb_tdscnt = tdscnt;
	if (fid != 0xFFFF)
		xa->xa_smb_fid = fid;
	xa->req_disp_param = psdisp + pscnt;
	xa->req_disp_data  = dsdisp + dscnt;

	/*
	 * See comment in smb_com_transaction_secondary
	 */
	if (xa->req_param_mb.chain_offset != psdisp) {
		DTRACE_PROBE2(trans_param_disp,
		    smb_xa_t *, xa, uint16_t, psdisp);
		xa->req_param_mb.chain_offset = psdisp;
	}
	if (xa->req_data_mb.chain_offset != dsdisp) {
		DTRACE_PROBE2(trans_data_disp,
		    smb_xa_t *, xa, uint16_t, dsdisp);
		xa->req_data_mb.chain_offset = dsdisp;
	}

	if (smb_mbc_copy(&xa->req_param_mb, &sr->command, psoff, pscnt)) {
		mutex_exit(&xa->xa_mutex);
		smb_xa_close(xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}
	if (smb_mbc_copy(&xa->req_data_mb, &sr->command, dsoff, dscnt)) {
		mutex_exit(&xa->xa_mutex);
		smb_xa_close(xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}
	mutex_exit(&xa->xa_mutex);

	if (!smb_trans_ready(xa))
		return (SDRC_NO_REPLY);

	if (!smb_xa_complete(xa))
		return (SDRC_NO_REPLY);

	return (smb_trans2_dispatch(sr, xa));
}

static smb_sdrc_t
smb_nt_trans_dispatch(struct smb_request *sr, struct smb_xa *xa)
{
	int rc;
	int total_bytes, n_setup, n_param, n_data;
	int param_off, param_pad, data_off, data_pad;

	switch (xa->smb_func) {
	case NT_TRANSACT_CREATE:
		if ((rc = smb_pre_nt_transact_create(sr, xa)) == 0)
			rc = smb_nt_transact_create(sr, xa);
		smb_post_nt_transact_create(sr, xa);
		break;
	case NT_TRANSACT_NOTIFY_CHANGE:
		rc = smb_nt_transact_notify_change(sr, xa);
		break;
	case NT_TRANSACT_QUERY_SECURITY_DESC:
		rc = smb_nt_transact_query_security_info(sr, xa);
		break;
	case NT_TRANSACT_SET_SECURITY_DESC:
		rc = smb_nt_transact_set_security_info(sr, xa);
		break;
	case NT_TRANSACT_IOCTL:
		rc = smb_nt_transact_ioctl(sr, xa);
		break;
	case NT_TRANSACT_QUERY_QUOTA:
		rc = smb_nt_transact_query_quota(sr, xa);
		break;
	case NT_TRANSACT_SET_QUOTA:
		rc = smb_nt_transact_set_quota(sr, xa);
		break;
	case NT_TRANSACT_RENAME:
		rc = smb_nt_transact_rename(sr, xa);
		break;

	default:
		smbsr_error(sr, 0, ERRSRV, ERRsmbcmd);
		return (SDRC_ERROR);
	}

	switch (rc) {
	case SDRC_SUCCESS:
		break;

	case SDRC_DROP_VC:
	case SDRC_NO_REPLY:
	case SDRC_ERROR:
	case SDRC_SR_KEPT:
		return (rc);

	case SDRC_NOT_IMPLEMENTED:
		smbsr_error(sr, 0, ERRSRV, ERRsmbcmd);
		return (SDRC_ERROR);

	default:
		break;
	}

	n_setup = MBC_LENGTH(&xa->rep_setup_mb);
	n_param = MBC_LENGTH(&xa->rep_param_mb);
	n_data  = MBC_LENGTH(&xa->rep_data_mb);

	if (xa->smb_msrcnt < n_setup ||
	    xa->smb_mprcnt < n_param ||
	    xa->smb_mdrcnt < n_data) {
		smbsr_error(sr, 0, ERRSRV, ERRsmbcmd);
		return (SDRC_ERROR);
	}

	/* neato, blast it over there */

	n_setup = (n_setup + 1) / 2;		/* Conver to setup words */
	param_pad = 1;				/* must be one */
	param_off = param_pad + 32 + 37 + (n_setup << 1) + 2;
	data_pad = (4 - ((param_off + n_param) & 3)) % 4; /* Pad to 4 byte */
	data_off = param_off + n_param + data_pad; /* Param off from hdr */
	total_bytes = param_pad + n_param + data_pad + n_data;

	rc = smbsr_encode_result(sr, 18+n_setup, total_bytes,
	    "b3.llllllllbCw#.C#.C",
	    18 + n_setup,		/* wct */
	    n_param,			/* Total Parameter Bytes */
	    n_data,			/* Total Data Bytes */
	    n_param,			/* Total Parameter Bytes this buffer */
	    param_off,			/* Param offset from header start */
	    0,				/* Param displacement */
	    n_data,			/* Total Data Bytes this buffer */
	    data_off,			/* Data offset from header start */
	    0,				/* Data displacement */
	    n_setup,			/* suwcnt */
	    &xa->rep_setup_mb,		/* setup[] */
	    total_bytes,		/* Total data bytes */
	    param_pad,
	    &xa->rep_param_mb,
	    data_pad,
	    &xa->rep_data_mb);
	return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
}

smb_sdrc_t
smb_pre_nt_transact(smb_request_t *sr)
{
	DTRACE_SMB_START(op__NtTransact, smb_request_t *, sr);
	return (SDRC_SUCCESS);
}

void
smb_post_nt_transact(smb_request_t *sr)
{
	DTRACE_SMB_DONE(op__NtTransact, smb_request_t *, sr);
}

smb_sdrc_t
smb_com_nt_transact(struct smb_request *sr)
{
	uint16_t	Function;
	unsigned char	MaxSetupCount, SetupCount;
	uint32_t	TotalParameterCount, TotalDataCount;
	uint32_t	MaxParameterCount, MaxDataCount, pscnt;
	uint32_t	psoff, dscnt, dsoff;
	smb_xa_t *xa;
	int ready;
	int rc;

	rc = smbsr_decode_vwv(sr, SMB_NT_TRANSHDR_ED_FMT, &MaxSetupCount,
	    &TotalParameterCount, &TotalDataCount, &MaxParameterCount,
	    &MaxDataCount, &pscnt, &psoff, &dscnt,
	    &dsoff, &SetupCount, &Function);

	if (rc != 0)
		return (SDRC_ERROR);

	xa = smb_xa_create(sr->session, sr, TotalParameterCount, TotalDataCount,
	    MaxParameterCount, MaxDataCount, MaxSetupCount, SetupCount);
	if (xa == 0) {
		smbsr_error(sr, 0, ERRSRV, ERRnoroom);
		return (SDRC_ERROR);
	}

	xa->smb_flags  = 0;
	xa->smb_timeout = 0;
	xa->smb_func = Function;
	xa->req_disp_param = pscnt;
	xa->req_disp_data  = dscnt;

	if (smb_mbc_copy(&xa->req_setup_mb, &sr->smb_vwv,
	    sr->smb_vwv.chain_offset, SetupCount * 2)) {
		smb_xa_rele(sr->session, xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}
	if (smb_mbc_copy(&xa->req_param_mb, &sr->command, psoff, pscnt)) {
		smb_xa_rele(sr->session, xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}
	if (smb_mbc_copy(&xa->req_data_mb, &sr->command, dsoff, dscnt)) {
		smb_xa_rele(sr->session, xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}

	ready = smb_trans_ready(xa);

	if (smb_xa_open(xa)) {
		smb_xa_rele(sr->session, xa);
		smbsr_error(sr, 0, ERRSRV, ERRsrverror);
		return (SDRC_ERROR);
	}
	sr->r_xa = xa;

	if (!ready) {
		rc = smbsr_encode_empty_result(sr);
		return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
	}

	if (!smb_xa_complete(xa)) {
		smb_xa_close(xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}

	return (smb_nt_trans_dispatch(sr, xa));
}

smb_sdrc_t
smb_pre_nt_transact_secondary(smb_request_t *sr)
{
	DTRACE_SMB_START(op__NtTransactSecondary, smb_request_t *, sr);
	return (SDRC_SUCCESS);
}

void
smb_post_nt_transact_secondary(smb_request_t *sr)
{
	DTRACE_SMB_DONE(op__NtTransactSecondary, smb_request_t *, sr);
}

smb_sdrc_t
smb_com_nt_transact_secondary(struct smb_request *sr)
{
	uint16_t tpscnt, tdscnt, fid;
	uint16_t pscnt, psoff, psdisp, dscnt, dsoff, dsdisp;
	smb_xa_t *xa;
	int rc;

	if ((xa = smbsr_lookup_xa(sr)) == 0) {
		smbsr_error(sr, 0, ERRSRV, ERRsrverror);
		return (SDRC_ERROR);
	}

	if (sr->session->signing.flags & SMB_SIGNING_ENABLED) {
		if (smb_sign_check_secondary(sr, xa->reply_seqnum) != 0) {
			smbsr_error(sr, NT_STATUS_ACCESS_DENIED,
			    ERRDOS, ERRnoaccess);
			return (SDRC_ERROR);
		}
	}

	if (xa->smb_com != SMB_COM_TRANSACTION2) {
		return (SDRC_DROP_VC);
	}

	rc = smbsr_decode_vwv(sr, SMB_TRANS2SHDR_ED_FMT, &tpscnt, &tdscnt,
	    &pscnt, &psoff, &psdisp, &dscnt, &dsoff, &dsdisp, &fid);

	if (rc != 0)
		return (SDRC_ERROR);

	mutex_enter(&xa->xa_mutex);
	if (xa->smb_tpscnt > tpscnt)
		xa->smb_tpscnt = tpscnt;
	if (xa->smb_tdscnt > tdscnt)
		xa->smb_tdscnt = tdscnt;
	if (fid != 0xFFFF)
		xa->xa_smb_fid = fid;
	xa->req_disp_param = psdisp + pscnt;
	xa->req_disp_data  = dsdisp + dscnt;

	/*
	 * See comment in smb_com_transaction_secondary
	 */
	if (xa->req_param_mb.chain_offset != psdisp) {
		DTRACE_PROBE2(trans_param_disp,
		    smb_xa_t *, xa, uint16_t, psdisp);
		xa->req_param_mb.chain_offset = psdisp;
	}
	if (xa->req_data_mb.chain_offset != dsdisp) {
		DTRACE_PROBE2(trans_data_disp,
		    smb_xa_t *, xa, uint16_t, dsdisp);
		xa->req_data_mb.chain_offset = dsdisp;
	}

	if (smb_mbc_copy(&xa->req_param_mb, &sr->command, psoff, pscnt)) {
		mutex_exit(&xa->xa_mutex);
		smb_xa_close(xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}
	if (smb_mbc_copy(&xa->req_data_mb, &sr->command, dsoff, dscnt)) {
		mutex_exit(&xa->xa_mutex);
		smb_xa_close(xa);
		smbsr_error(sr, 0, ERRDOS, ERRbadformat);
		return (SDRC_ERROR);
	}
	mutex_exit(&xa->xa_mutex);

	if (!smb_trans_ready(xa))
		return (SDRC_NO_REPLY);

	if (!smb_xa_complete(xa))
		return (SDRC_NO_REPLY);

	return (smb_nt_trans_dispatch(sr, xa));
}

static int
smb_trans_ready(smb_xa_t *xa)
{
	int rc;

	mutex_enter(&xa->xa_mutex);
	rc = xa->req_disp_data >= xa->smb_tdscnt &&
	    xa->req_disp_param >= xa->smb_tpscnt;
	mutex_exit(&xa->xa_mutex);

	return (rc);
}

static void
smb_encode_SHARE_INFO_1(struct mbuf_chain *output, struct mbuf_chain *text,
    char *oem_name, uint16_t type, char *comment)
{
	(void) smb_mbc_encodef(output, "13c.wl", oem_name,
	    type, MBC_LENGTH(text));

	(void) smb_mbc_encodef(text, "s", comment ? comment : "");
}

static void
smb_encode_SHARE_INFO_2(struct mbuf_chain *output, struct mbuf_chain *text,
	smb_request_t *sr, char *oem_name, uint16_t type,
	char *comment, uint16_t access, char *path, char *password)
{
	unsigned char pword[9];

	bzero(pword, sizeof (pword));
	(void) strncpy((char *)pword, password, sizeof (pword));
	smb_encode_SHARE_INFO_1(output, text, oem_name, type, comment);
	(void) smb_mbc_encodef(output, "wwwl9c.",
	    access,
	    sr->sr_cfg->skc_maxconnections,
	    smb_server_get_session_count(sr->sr_server),
	    MBC_LENGTH(text),
	    pword);
	(void) smb_mbc_encodef(text, "s", path);
}

int
smb_trans_net_share_enum(struct smb_request *sr, struct smb_xa *xa)
{
	uint16_t pid_hi, pid_lo;

	/*
	 * Number of data bytes that will
	 * be sent in the current response
	 */
	uint16_t data_scnt;

	/*
	 * Total number of data bytes that
	 * are sent till now. This is only
	 * used for calculating current data
	 * displacement
	 */
	uint16_t tot_data_scnt;

	/*
	 * Number of parameter bytes should
	 * be sent for the current response.
	 * It is 8 for the 1st response and
	 * 0 for others
	 */
	uint16_t param_scnt;

	/* number of setup and parameter bytes */
	uint16_t n_setup, n_param;

	/* data and parameter displacement */
	uint16_t data_disp, param_disp;

	/* parameter and data offset and pad */
	int param_off, param_pad, data_off, data_pad;

	/*
	 * total bytes of parameters and data
	 * in the packet, plus the pad bytes.
	 */
	int tot_packet_bytes;

	boolean_t first_resp;

	char fmt[16];
	struct mbuf_chain reply;

	uint16_t level;
	uint16_t pkt_bufsize;
	smb_enumshare_info_t esi;
	char *sent_buf;

	ASSERT(sr->uid_user);

	if (smb_mbc_decodef(&xa->req_param_mb, "ww", &level,
	    &esi.es_bufsize) != 0)
		return (SDRC_NOT_IMPLEMENTED);

	if (level != 1) {
		/*
		 * Only level 1 is valid for NetShareEnum
		 * None of the error codes in the spec are meaningful
		 * here. This error code is returned by Windows.
		 */
		(void) smb_mbc_encodef(&xa->rep_param_mb, "wwww",
		    ERROR_INVALID_LEVEL, 0, 0, 0);
		return (SDRC_SUCCESS);
	}

	esi.es_buf = smb_srm_zalloc(sr, esi.es_bufsize);
	esi.es_posix_uid = crgetuid(sr->uid_user->u_cred);
	smb_kshare_enum(sr->sr_server, &esi);

	/* client buffer size is not big enough to hold any shares */
	if (esi.es_nsent == 0) {
		(void) smb_mbc_encodef(&xa->rep_param_mb, "wwww",
		    ERROR_MORE_DATA, 0, esi.es_nsent, esi.es_ntotal);
		return (SDRC_SUCCESS);
	}

	/*
	 * Initialize the reply mbuf chain.  Note that we re-initialize
	 * this on each pass through the loop below.
	 */
	MBC_SETUP(&reply, smb_maxbufsize);

	/*
	 * The rep_setup_mb is already initialized in smb_trans_dispatch().
	 * Calling MBC_INIT() will initialized the structure and so the
	 * pointer to the mbuf chains will be lost. Therefore, we need
	 * to free the resources before calling MBC_INIT() again.
	 */
	n_setup = 0;	/* Setup count for NetShareEnum SMB is 0 */
	MBC_FLUSH(&xa->rep_setup_mb);

	n_param = 8;
	pkt_bufsize = sr->session->smb_msg_size -
	    (SMB_HEADER_ED_LEN + RESP_HEADER_LEN + n_param);

	tot_data_scnt = 0;
	sent_buf = esi.es_buf;
	first_resp = B_TRUE;

	while (tot_data_scnt < esi.es_datasize) {
		data_scnt = esi.es_datasize - tot_data_scnt;
		if (data_scnt > pkt_bufsize)
			data_scnt = pkt_bufsize;
		MBC_FLUSH(&xa->rep_data_mb);

		(void) sprintf(fmt, "%dc", data_scnt);
		(void) smb_mbc_encodef(&xa->rep_data_mb, fmt, sent_buf);

		sent_buf += data_scnt;
		tot_data_scnt += data_scnt;

		/* Only the 1st response packet contains parameters */
		param_scnt = (first_resp) ? n_param : 0;
		param_pad = 1;				/* always one */
		param_off = SMB_HEADER_ED_LEN + RESP_HEADER_LEN;
		param_disp = (first_resp) ? 0 : n_param;

		MBC_FLUSH(&xa->rep_param_mb);

		if (first_resp) {
			first_resp = B_FALSE;
			(void) smb_mbc_encodef(&xa->rep_param_mb, "wwww",
			    (esi.es_ntotal > esi.es_nsent)
			    ? ERROR_MORE_DATA : 0,
			    0, esi.es_nsent, esi.es_ntotal);
		}

		data_pad = (param_off + n_param) & 1;	/* Pad to short */

		/* data off from hdr start */
		data_off = param_off + param_scnt + data_pad;
		data_disp = tot_data_scnt - data_scnt;
		tot_packet_bytes = param_pad + param_scnt + data_pad +
		    data_scnt;

		pid_hi = sr->smb_pid >> 16;
		pid_lo = (uint16_t)sr->smb_pid;

		MBC_FLUSH(&reply);
		(void) smb_mbc_encodef(&reply, SMB_HEADER_ED_FMT,
		    sr->first_smb_com,
		    sr->smb_rcls,
		    sr->smb_reh,
		    sr->smb_err,
		    sr->smb_flg | SMB_FLAGS_REPLY,
		    sr->smb_flg2,
		    pid_hi,
		    sr->smb_sig,
		    sr->smb_tid,
		    pid_lo,
		    sr->smb_uid,
		    sr->smb_mid);

		(void) smb_mbc_encodef(&reply,
		    "bww2.wwwwwwb.Cw#.C#.C",
		    10 + n_setup,	/* wct */
		    n_param,		/* Total Parameter Bytes */
		    esi.es_datasize,	/* Total Data Bytes */
		    param_scnt,		/* Total Parameter Bytes this buffer */
		    param_off,		/* Param offset from header start */
		    param_disp,		/* Param displacement */
		    data_scnt,		/* Total Data Bytes this buffer */
		    data_off,		/* Data offset from header start */
		    data_disp,		/* Data displacement */
		    n_setup,		/* suwcnt */
		    &xa->rep_setup_mb,	/* setup[] */
		    tot_packet_bytes,	/* Total data bytes */
		    param_pad,
		    &xa->rep_param_mb,
		    data_pad,
		    &xa->rep_data_mb);

		if (sr->session->signing.flags & SMB_SIGNING_ENABLED)
			smb_sign_reply(sr, &reply);

		(void) smb_session_send(sr->session, 0, &reply);

	}

	m_freem(reply.chain);

	return (SDRC_NO_REPLY);
}

int
smb_trans_net_share_getinfo(smb_request_t *sr, struct smb_xa *xa)
{
	uint16_t		level, max_bytes, access;
	struct mbuf_chain	str_mb;
	char			*share;
	char			*password;
	smb_kshare_t		*si;

	if (smb_mbc_decodef(&xa->req_param_mb, "%sww", sr,
	    &share, &level, &max_bytes) != 0)
		return (SDRC_NOT_IMPLEMENTED);

	si = smb_kshare_lookup(sr->sr_server, share);
	if ((si == NULL) || (si->shr_oemname == NULL)) {
		(void) smb_mbc_encodef(&xa->rep_param_mb, "www",
		    NERR_NetNameNotFound, 0, 0);
		if (si)
			smb_kshare_release(sr->sr_server, si);
		return (SDRC_SUCCESS);
	}

	access = SHARE_ACCESS_ALL;
	password = "";

	MBC_INIT(&str_mb, max_bytes);

	switch (level) {
	case 0 :
		(void) smb_mbc_encodef(&xa->rep_data_mb, "13c",
		    si->shr_oemname);
		break;

	case 1 :
		smb_encode_SHARE_INFO_1(&xa->rep_data_mb, &str_mb,
		    si->shr_oemname, si->shr_type, si->shr_cmnt);
		break;

	case 2 :
		smb_encode_SHARE_INFO_2(&xa->rep_data_mb, &str_mb, sr,
		    si->shr_oemname, si->shr_type, si->shr_cmnt, access,
		    si->shr_path, password);
		break;

	default:
		smb_kshare_release(sr->sr_server, si);
		(void) smb_mbc_encodef(&xa->rep_param_mb, "www",
		    ERROR_INVALID_LEVEL, 0, 0);
		m_freem(str_mb.chain);
		return (SDRC_NOT_IMPLEMENTED);
	}

	smb_kshare_release(sr->sr_server, si);
	(void) smb_mbc_encodef(&xa->rep_param_mb, "www", NERR_Success,
	    -MBC_LENGTH(&xa->rep_data_mb),
	    MBC_LENGTH(&xa->rep_data_mb) + MBC_LENGTH(&str_mb));
	(void) smb_mbc_encodef(&xa->rep_data_mb, "C", &str_mb);
	m_freem(str_mb.chain);
	return (SDRC_SUCCESS);
}

int
smb_trans_net_workstation_getinfo(struct smb_request *sr, struct smb_xa *xa)
{
	uint16_t		level, max_bytes;
	struct mbuf_chain	str_mb;
	char *domain;
	char *hostname;

	if ((smb_mbc_decodef(&xa->req_param_mb, "ww",
	    &level, &max_bytes) != 0) ||
	    (level != 10)) {
		(void) smb_mbc_encodef(&xa->rep_param_mb, "wwww",
		    NERR_BadTransactConfig, 0, 0, 0);
		return (SDRC_SUCCESS);
	}

	domain = sr->sr_cfg->skc_nbdomain;
	hostname = sr->sr_cfg->skc_hostname;

	MBC_INIT(&str_mb, max_bytes);

	(void) smb_mbc_encodef(&str_mb, "."); /* Prevent NULL pointers */

	(void) smb_mbc_encodef(&xa->rep_data_mb, "l", MBC_LENGTH(&str_mb));
	(void) smb_mbc_encodef(&str_mb, "s", hostname);
	(void) smb_mbc_encodef(&xa->rep_data_mb, "l", MBC_LENGTH(&str_mb));
	(void) smb_mbc_encodef(&str_mb, "s", "nobody");
	(void) smb_mbc_encodef(&xa->rep_data_mb, "l", MBC_LENGTH(&str_mb));
	(void) smb_mbc_encodef(&str_mb, "s", domain);
	(void) smb_mbc_encodef(&xa->rep_data_mb, "bbl",
	    (uint8_t)sr->sr_cfg->skc_version.sv_major,
	    (uint8_t)sr->sr_cfg->skc_version.sv_minor,
	    MBC_LENGTH(&str_mb));
	(void) smb_mbc_encodef(&str_mb, "s", domain);
	(void) smb_mbc_encodef(&xa->rep_data_mb, "l", MBC_LENGTH(&str_mb));
	(void) smb_mbc_encodef(&str_mb, "s", domain);

	(void) smb_mbc_encodef(&xa->rep_param_mb, "www", 0,
	    -MBC_LENGTH(&xa->rep_data_mb),
	    MBC_LENGTH(&xa->rep_data_mb) + MBC_LENGTH(&str_mb));
	(void) smb_mbc_encodef(&xa->rep_data_mb, "C", &str_mb);
	m_freem(str_mb.chain);
	return (SDRC_SUCCESS);
}

int
smb_trans_net_user_getinfo(struct smb_request *sr, struct smb_xa *xa)
{
	uint16_t		level, max_bytes;
	unsigned char		*user;
	int rc;

	rc = smb_mbc_decodef(&xa->req_param_mb, "%sww", sr,
	    &user,
	    &level,
	    &max_bytes);

	if (rc != 0)
		return (SDRC_NOT_IMPLEMENTED);

	(void) smb_mbc_encodef(&xa->rep_param_mb, "www",
	    NERR_UserNotFound, 0, 0);
	return (SDRC_SUCCESS);
}

smb_sdrc_t
smb_trans_net_server_getinfo(struct smb_request *sr, struct smb_xa *xa)
{
	uint16_t		level, buf_size;
	uint16_t		avail_data, max_data;
	char			server_name[16];
	struct mbuf_chain	str_mb;

	if (smb_mbc_decodef(&xa->req_param_mb, "ww", &level, &buf_size) != 0)
		return (SDRC_ERROR);

	max_data = MBC_MAXBYTES(&xa->rep_data_mb);

	MBC_INIT(&str_mb, buf_size);

	bzero(server_name, sizeof (server_name));
	(void) strncpy(server_name, sr->sr_cfg->skc_hostname,
	    sizeof (server_name));

	/* valid levels are 0 and 1 */
	switch (level) {
	case 0:
		(void) smb_mbc_encodef(&xa->rep_data_mb, "16c", server_name);
		break;

	case 1:
		(void) smb_mbc_encodef(&str_mb, "s",
		    sr->sr_cfg->skc_system_comment);
		(void) smb_mbc_encodef(&xa->rep_data_mb, "16cbbll", server_name,
		    (uint8_t)sr->sr_cfg->skc_version.sv_major,
		    (uint8_t)sr->sr_cfg->skc_version.sv_minor,
		    MY_SERVER_TYPE, max_data - MBC_LENGTH(&str_mb));
		break;

	default:
		(void) smb_mbc_encodef(&xa->rep_param_mb, "www",
		    ERROR_INVALID_LEVEL, 0, 0);
		m_freem(str_mb.chain);
		return (SDRC_SUCCESS);
	}

	avail_data = MBC_LENGTH(&xa->rep_data_mb) + MBC_LENGTH(&str_mb);
	(void) smb_mbc_encodef(&xa->rep_param_mb, "www",
	    NERR_Success, max_data - avail_data, avail_data);
	(void) smb_mbc_encodef(&xa->rep_data_mb, "C", &str_mb);
	m_freem(str_mb.chain);
	return (SDRC_SUCCESS);
}

/*
 * 6.4 The NetServerEnum2 RAP Service
 *
 * The NetServerEnum2 RAP service lists all computers of the specified type
 * or types that are visible in the specified domains. It may also
 * enumerate domains.
 *
 * The following definition uses the notation and terminology defined in
 * the CIFS Remote Administration Protocol specification, which is required
 * in order to make it well-defined. The definition is:
 *
 *     uint16_t NetServerEnum2 (
 *         uint16_t  sLevel,
 *         RCVBUF          pbBuffer,
 *         RCVBUFLEN       cbBuffer,
 *         ENTCOUNT        pcEntriesRead,
 *         uint16_t  *pcTotalAvail,
 *         uint32_t   fServerType,
 *         char            *pszDomain,
 *     );
 *
 * where:
 *
 *    sLevel specifies the level of detail (0 or 1) requested.
 *
 *    pbBuffer points to the buffer to receive the returned data. If the
 *    function is successful, the buffer contains a sequence of
 *    server_info_x structures, where x is 0 or 1, depending on the
 *    level of detail requested.
 *
 *    cbBuffer specifies the size, in bytes, of the buffer pointed to by
 *    the pbBuffer parameter.
 *
 *    pcEntriesRead points to a 16 bit variable that receives a count of
 *    the number of servers enumerated in the buffer. This count is
 *    valid only if NetServerEnum2 returns the NERR_Success or
 *    ERROR_MORE_DATA values.
 *
 *    pcTotal Avail points to a 16 bit variable that receives a count of
 *    the total number of available entries. This count is valid only if
 *    NetServerEnum2 returns the NERR_Success or ERROR_MORE_DATA values.
 *
 *     fServerType specifies the type or types of computers to enumerate.
 *     Computers that match at least one of the specified types are
 *     returned in the buffer. Possible values are defined in the request
 *     parameters section.
 *
 *    pszDomain points to a null-terminated string that contains the
 *    name of the workgroup in which to enumerate computers of the
 *    specified type or types. If the pszDomain parameter is a null
 *    string or a null pointer, servers are enumerated for the current
 *    domain of the computer.
 *
 * 6.4.1 Transaction Request Parameters section
 *
 * The Transaction request parameters section in this instance contains:
 * . The 16 bit function number for NetServerEnum2 which is 104.
 * . The parameter descriptor string which is "WrLehDz".
 * . The data descriptor string for the (returned) data which is "B16" for
 *   level detail 0 or "B16BBDz" for level detail 1.
 * . The actual parameters as described by the parameter descriptor
 *   string.
 *
 * The parameters are:
 * . A 16 bit integer with a value of 0 or 1 (corresponding to the "W" in
 *   the parameter descriptor string. This represents the level of detail
 *   the server is expected to return
 * . A 16 bit integer that contains the size of the receive buffer.
 * . A 32 bit integer that represents the type of servers the function
 *   should enumerate. The possible values may be any of the following or
 *   a combination of the following:
 *
 * SV_TYPE_WORKSTATION        0x00000001 All workstations
 * SV_TYPE_SERVER             0x00000002 All servers
 * SV_TYPE_SQLSERVER          0x00000004 Any server running with SQL
 *                                       server
 * SV_TYPE_DOMAIN_CTRL        0x00000008 Primary domain controller
 * SV_TYPE_DOMAIN_BAKCTRL     0x00000010 Backup domain controller
 * SV_TYPE_TIME_SOURCE        0x00000020 Server running the timesource
 *                                       service
 * SV_TYPE_AFP                0x00000040 Apple File Protocol servers
 * SV_TYPE_NOVELL             0x00000080 Novell servers
 * SV_TYPE_DOMAIN_MEMBER      0x00000100 Domain Member
 * SV_TYPE_PRINTQ_SERVER      0x00000200 Server sharing print queue
 * SV_TYPE_DIALIN_SERVER      0x00000400 Server running dialin service.
 * SV_TYPE_XENIX_SERVER       0x00000800 Xenix server
 * SV_TYPE_NT                 0x00001000 NT server
 * SV_TYPE_WFW                0x00002000 Server running Windows for
 *                                       Workgroups
 * SV_TYPE_SERVER_NT          0x00008000 Windows NT non DC server
 * SV_TYPE_POTENTIAL_BROWSER  0x00010000 Server that can run the browser
 *                                       service
 * SV_TYPE_BACKUP_BROWSER     0x00020000 Backup browser server
 * SV_TYPE_MASTER_BROWSER     0x00040000 Master browser server
 * SV_TYPE_DOMAIN_MASTER      0x00080000 Domain Master Browser server
 * SV_TYPE_LOCAL_LIST_ONLY    0x40000000 Enumerate only entries marked
 *                                       "local"
 * SV_TYPE_DOMAIN_ENUM        0x80000000 Enumerate Domains. The pszDomain
 *                                       parameter must be NULL.
 *
 * . A null terminated ASCII string representing the pszDomain parameter
 *   described above
 *
 * 6.4.2 Transaction Request Data section
 *
 * There is no data or auxiliary data to send as part of the request.
 *
 * 6.4.3 Transaction Response Parameters section
 *
 * The transaction response parameters section consists of:
 * . A 16 bit word indicating the return status. The possible values are:
 *
 * Code                   Value  Description
 * NERR_Success           0      No errors encountered
 * ERROR_MORE_DATA        234    Additional data is available
 * NERR_ServerNotStarted  2114   The RAP service on the remote computer
 *                               is not running
 * NERR_BadTransactConfig 2141   The server is not configured for
 *                               transactions, IPC$ is not shared
 *
 * . A 16 bit "converter" word.
 * . A 16 bit number representing the number of entries returned.
 * . A 16 bit number representing the total number of available entries.
 *   If the supplied buffer is large enough, this will equal the number of
 *   entries returned.
 *
 * 6.4.4 Transaction Response Data section
 *
 * The return data section consists of a number of SERVER_INFO_1 structures.
 * The number of such structures present is determined by the third entry
 * (described above) in the return parameters section.
 *
 * At level detail 0, the Transaction response data section contains a
 * number of SERVER_INFO_0 data structure. The number of such structures is
 * equal to the 16 bit number returned by the server in the third parameter
 * in the Transaction response parameter section. The SERVER_INFO_0 data
 * structure is defined as:
 *
 *     struct SERVER_INFO_0 {
 *         char        sv0_name[16];
 *     };
 *
 *  where:
 *
 *    sv0_name is a null-terminated string that specifies the name of a
 *    computer or domain .
 *
 * At level detail 1, the Transaction response data section contains a
 * number of SERVER_INFO_1 data structure. The number of such structures is
 * equal to the 16 bit number returned by the server in the third parameter
 * in the Transaction response parameter section. The SERVER_INFO_1 data
 * structure is defined as:
 *
 *     struct SERVER_INFO_1 {
 *         char            sv1_name[16];
 *         char            sv1_version_major;
 *         char            sv1_version_minor;
 *         uint32_t   sv1_type;
 *         char        *sv1_comment_or_master_browser;
 *     };
 *
 *    sv1_name contains a null-terminated string that specifies the name
 *    of a computer, or a domain name if SV_TYPE_DOMAIN_ENUM is set in
 *    sv1_type.
 *
 *    sv1_version_major whatever was specified in the HostAnnouncement
 *    or DomainAnnouncement frame with which the entry was registered.
 *
 *    sv1_version_minor whatever was specified in the HostAnnouncement
 *    or DomainAnnouncement frame with which the entry was registered.
 *
 *    sv1_type specifies the type of software the computer is running.
 *    The member can be one or a combination of the values defined above
 *    in the Transaction request parameters section for fServerType.
 *
 *
 *    sv1_comment_or_master_browser points to a null-terminated string. If
 *    the sv1_type indicates that the entry is for a domain, this
 *    specifies the name of server running the domain master browser;
 *    otherwise, it specifies a comment describing the server. The comment
 *    can be a null string or the pointer may be a null pointer.
 *
 *    In case there are multiple SERVER_INFO_1 data structures to
 *    return, the server may put all these fixed length structures in
 *    the return buffer, leave some space and then put all the variable
 *    length data (the actual value of the sv1_comment strings) at the
 *    end of the buffer.
 *
 * There is no auxiliary data to receive.
 */

int
smb_trans_net_server_enum2(struct smb_request *sr, struct smb_xa *xa)
{
	uint16_t opcode, level, max_bytes;
	uint32_t server_type;
	unsigned char *domain;
	struct mbuf_chain str_mb;
	char *hostname, *s;
	smb_kmod_cfg_t *si;

	if (smb_mbc_decodef(&xa->req_param_mb,
	    "%wsswwls", sr, &opcode, &s, &s,
	    &level, &max_bytes, &server_type, &domain) != 0)
		return (SDRC_NOT_IMPLEMENTED);

	si = sr->sr_cfg;

	if (smb_strcasecmp(si->skc_nbdomain, (char *)domain, 0) != 0) {
		(void) smb_mbc_encodef(&xa->rep_param_mb, "wwww", 0, 0, 0, 0);
		return (SDRC_SUCCESS);
	}

	if ((server_type & MY_SERVER_TYPE) == 0) {
		(void) smb_mbc_encodef(&xa->rep_param_mb, "wwww", 0, 0, 0, 0);
		return (SDRC_SUCCESS);
	}

	MBC_INIT(&str_mb, max_bytes);

	hostname = si->skc_hostname;

	(void) smb_mbc_encodef(&xa->rep_data_mb, "16c", hostname);
	if (level == 1) {
		(void) smb_mbc_encodef(&xa->rep_data_mb, "bbll",
		    (uint8_t)sr->sr_cfg->skc_version.sv_major,
		    (uint8_t)sr->sr_cfg->skc_version.sv_minor,
		    MY_SERVER_TYPE, MBC_LENGTH(&str_mb));
		(void) smb_mbc_encodef(&str_mb, "s", si->skc_system_comment);
	}

	(void) smb_mbc_encodef(&xa->rep_param_mb, "wwww", 0,
	    -MBC_LENGTH(&xa->rep_data_mb), 1, 1);
	(void) smb_mbc_encodef(&xa->rep_data_mb, "m", str_mb.chain);
	return (SDRC_SUCCESS);
}

static boolean_t
is_supported_mailslot(const char *mailslot)
{
	static char *mailslots[] = {
		PIPE_LANMAN,
		MAILSLOT_LANMAN,
		MAILSLOT_BROWSE,
		MAILSLOT_MSBROWSE
	};

	int i;

	for (i = 0; i < sizeof (mailslots)/sizeof (mailslots[0]); ++i)
		if (smb_strcasecmp(mailslot, mailslots[i], 0) == 0)
			return (B_TRUE);

	return (B_FALSE);
}

/*
 * smb_trans_nmpipe
 *
 * This is used for RPC bind and request transactions.
 *
 * If the data available from the pipe is larger than the maximum
 * data size requested by the client, return as much as requested.
 * The residual data remains in the pipe until the client comes back
 * with a read request or closes the pipe.
 *
 * When we read less than what's available, we MUST return the
 * status NT_STATUS_BUFFER_OVERFLOW (or ERRDOS/ERROR_MORE_DATA)
 */
static smb_sdrc_t
smb_trans_nmpipe(smb_request_t *sr, smb_xa_t *xa)
{
	smb_fsctl_t fsctl;
	uint32_t status;

	smbsr_lookup_file(sr);
	if (sr->fid_ofile == NULL) {
		smbsr_error(sr, NT_STATUS_INVALID_HANDLE,
		    ERRDOS, ERRbadfid);
		return (SDRC_ERROR);
	}

	/*
	 * A little confusing perhaps, but the fsctl "input" is what we
	 * write to the pipe (from the transaction "send" data), and the
	 * fsctl "output" is what we read from the pipe (and becomes the
	 * transaction receive data).
	 */
	fsctl.CtlCode = FSCTL_PIPE_TRANSCEIVE;
	fsctl.InputCount = xa->smb_tdscnt; /* write count */
	fsctl.OutputCount = 0; /* minimum to read from the pipe */
	fsctl.MaxOutputResp = xa->smb_mdrcnt;	/* max to read */
	fsctl.in_mbc = &xa->req_data_mb; /* write from here */
	fsctl.out_mbc = &xa->rep_data_mb; /* read into here */

	status = smb_opipe_transceive(sr, &fsctl);
	if (status) {
		smbsr_status(sr, status, 0, 0);
		if (NT_SC_SEVERITY(status) == NT_STATUS_SEVERITY_ERROR)
			return (SDRC_ERROR);
		/* Warnings like NT_STATUS_BUFFER_OVERFLOW are OK */
	}

	return (SDRC_SUCCESS);
}

static smb_sdrc_t
smb_trans_dispatch(smb_request_t *sr, smb_xa_t *xa)
{
	int		rc, pos;
	int		total_bytes, n_setup, n_param, n_data;
	int		param_off, param_pad, data_off, data_pad;
	uint16_t	opcode;
	uint16_t	devstate;
	char		*req_fmt;
	char		*rep_fmt;

	if (xa->smb_suwcnt > 0) {
		rc = smb_mbc_decodef(&xa->req_setup_mb, "ww", &opcode,
		    &sr->smb_fid);
		if (rc != 0)
			goto trans_err_not_supported;
		switch (opcode) {
		case TRANS_SET_NMPIPE_STATE:
			if ((rc = smb_mbc_decodef(&xa->req_param_mb, "w",
			    &devstate)) != 0)
				goto trans_err_not_supported;

			rc = SDRC_SUCCESS;
			break;

		case TRANS_TRANSACT_NMPIPE:
			rc = smb_trans_nmpipe(sr, xa);
			break;

		case TRANS_WAIT_NMPIPE:
			delay(SEC_TO_TICK(1));
			rc = SDRC_SUCCESS;
			break;

		default:
			goto trans_err_not_supported;
		}
	} else {
		if (!is_supported_mailslot(xa->xa_pipe_name))
			goto trans_err_not_supported;

		if ((rc = smb_mbc_decodef(&xa->req_param_mb, "%wss", sr,
		    &opcode, &req_fmt, &rep_fmt)) != 0)
			goto trans_err_not_supported;

		switch (opcode) {
		case API_WshareEnum:
			rc = smb_trans_net_share_enum(sr, xa);
			break;

		case API_WshareGetInfo:
			rc = smb_trans_net_share_getinfo(sr, xa);
			break;

		case API_WserverGetInfo:
			rc = smb_trans_net_server_getinfo(sr, xa);
			break;

		case API_WUserGetInfo:
			rc = smb_trans_net_user_getinfo(sr, xa);
			break;

		case API_WWkstaGetInfo:
			rc = smb_trans_net_workstation_getinfo(sr, xa);
			break;

		case API_NetServerEnum2:
			rc = smb_trans_net_server_enum2(sr, xa);
			break;

		default:
			goto trans_err_not_supported;
		}
	}

	switch (rc) {
	case SDRC_SUCCESS:
		break;

	case SDRC_DROP_VC:
	case SDRC_NO_REPLY:
	case SDRC_ERROR:
		return (rc);

	case SDRC_NOT_IMPLEMENTED:
		goto trans_err_not_supported;

	default:
		break;
	}

	n_setup = MBC_LENGTH(&xa->rep_setup_mb);
	n_param = MBC_LENGTH(&xa->rep_param_mb);
	n_data  = MBC_LENGTH(&xa->rep_data_mb);

	if (xa->smb_msrcnt < n_setup ||
	    xa->smb_mprcnt < n_param ||
	    xa->smb_mdrcnt < n_data) {
		goto trans_err_too_small;
	}

	/* neato, blast it over there */

	n_setup = (n_setup + 1) / 2;		/* Convert to setup words */
	param_pad = 1;				/* always one */
	param_off = param_pad + 32 + 21 + (n_setup << 1) + 2;
	data_pad = (param_off + n_param) & 1;	/* Pad to short */
	/* Param off from hdr start */
	data_off = param_off + n_param + data_pad;
	total_bytes = param_pad + n_param + data_pad + n_data;

	rc = smbsr_encode_result(sr, 10+n_setup, total_bytes,
	    "bww2.wwwwwwb.Cw#.C#.C",
	    10 + n_setup,		/* wct */
	    n_param,			/* Total Parameter Bytes */
	    n_data,			/* Total Data Bytes */
	    n_param,			/* Total Parameter Bytes this buffer */
	    param_off,			/* Param offset from header start */
	    0,				/* Param displacement */
	    n_data,			/* Total Data Bytes this buffer */
	    data_off,			/* Data offset from header start */
	    0,				/* Data displacement */
	    n_setup,			/* suwcnt */
	    &xa->rep_setup_mb, /* setup[] */
	    total_bytes,		/* Total data bytes */
	    param_pad,
	    &xa->rep_param_mb,
	    data_pad,
	    &xa->rep_data_mb);
	return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);

trans_err_too_small:
	rc = NERR_BufTooSmall;
	goto trans_err;

trans_err_not_supported:
	rc = ERROR_NOT_SUPPORTED;
	goto trans_err;

trans_err:
	pos = MBC_LENGTH(&sr->reply) + 23;
	rc = smbsr_encode_result(sr, 10, 4, "bww2.wwwwwwb.www",
	    10,		/* wct */
	    4, 0,	/* tpscnt tdscnt */
	    4, pos, 0,	/* pscnt psoff psdisp */
	    0, 0, 0,	/* dscnt dsoff dsdisp */
	    0,		/* suwcnt */
	    4,		/* bcc */
	    rc,
	    0);		/* converter word? */
	return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
}

static smb_sdrc_t
smb_trans2_dispatch(smb_request_t *sr, smb_xa_t *xa)
{
	int		rc, pos;
	int		total_bytes, n_setup, n_param, n_data;
	int		param_off, param_pad, data_off;
	uint16_t	data_pad;
	uint16_t	opcode;
	uint16_t  nt_unknown_secret = 0x0100;
	char *fmt;

	n_data = xa->smb_mdrcnt;

	if (smb_mbc_decodef(&xa->req_setup_mb, "w", &opcode) != 0)
		goto trans_err_not_supported;

	/*
	 * Save this for /proc to read later.
	 */
	xa->smb_func = opcode;

	/* for now, only respond to the */
	switch (opcode) {
	case TRANS2_OPEN2:
		rc = smb_com_trans2_open2(sr, xa);
		break;

	case TRANS2_CREATE_DIRECTORY:
		rc = smb_com_trans2_create_directory(sr, xa);
		break;

	case TRANS2_FIND_FIRST2:
		/*
		 * Should have enough room to send the response
		 * data back to client.
		 */
		if (n_data == 0) {
			smbsr_error(sr, NT_STATUS_INFO_LENGTH_MISMATCH,
			    ERRDOS, ERROR_BAD_LENGTH);
			return (SDRC_ERROR);
		}
		rc = smb_com_trans2_find_first2(sr, xa);
		break;

	case TRANS2_FIND_NEXT2:
		/*
		 * Should have enough room to send the response
		 * data back to client.
		 */
		if (n_data == 0) {
			smbsr_error(sr, NT_STATUS_INFO_LENGTH_MISMATCH,
			    ERRDOS, ERROR_BAD_LENGTH);
			return (SDRC_ERROR);
		}
		rc = smb_com_trans2_find_next2(sr, xa);
		break;

	case TRANS2_QUERY_FS_INFORMATION:
		/*
		 * Should have enough room to send the response
		 * data back to client.
		 */
		if (n_data == 0) {
			smbsr_error(sr, NT_STATUS_INFO_LENGTH_MISMATCH,
			    ERRDOS, ERROR_BAD_LENGTH);
			return (SDRC_ERROR);
		}
		rc = smb_com_trans2_query_fs_information(sr, xa);
		break;

	case TRANS2_SET_FS_INFORMATION:
		rc = smb_com_trans2_set_fs_information(sr, xa);
		break;

	case TRANS2_QUERY_PATH_INFORMATION:
		/*
		 * Should have enough room to send the response
		 * data back to client.
		 */
		if (n_data == 0) {
			smbsr_error(sr, NT_STATUS_INFO_LENGTH_MISMATCH,
			    ERRDOS, ERROR_BAD_LENGTH);
			return (SDRC_ERROR);
		}
		rc = smb_com_trans2_query_path_information(sr, xa);
		break;

	case TRANS2_QUERY_FILE_INFORMATION:
		/*
		 * Should have enough room to send the response
		 * data back to client.
		 */
		if (n_data == 0) {
			smbsr_error(sr, NT_STATUS_INFO_LENGTH_MISMATCH,
			    ERRDOS, ERROR_BAD_LENGTH);
			return (SDRC_ERROR);
		}
		rc = smb_com_trans2_query_file_information(sr, xa);
		break;

	case TRANS2_SET_PATH_INFORMATION:
		rc = smb_com_trans2_set_path_information(sr, xa);
		break;

	case TRANS2_SET_FILE_INFORMATION:
		rc = smb_com_trans2_set_file_information(sr, xa);
		break;

	case TRANS2_GET_DFS_REFERRAL:
		rc = smb_com_trans2_get_dfs_referral(sr, xa);
		break;

	default:
		(void) smb_mbc_encodef(&xa->rep_param_mb, "w", 0);
		goto trans_err_not_supported;
	}

	switch (rc) {
	case SDRC_SUCCESS:
		break;

	case SDRC_DROP_VC:
	case SDRC_NO_REPLY:
	case SDRC_ERROR:
		return (rc);

	case SDRC_NOT_IMPLEMENTED:
		goto trans_err_not_supported;

	default:
		break;
	}

	n_setup = MBC_LENGTH(&xa->rep_setup_mb);
	n_param = MBC_LENGTH(&xa->rep_param_mb);
	n_data  = MBC_LENGTH(&xa->rep_data_mb);

	if (xa->smb_msrcnt < n_setup ||
	    xa->smb_mprcnt < n_param ||
	    xa->smb_mdrcnt < n_data) {
		goto trans_err_too_small;
	}

	/* neato, blast it over there */

	n_setup = (n_setup + 1) / 2;		/* Conver to setup words */
	param_pad = 1;				/* must be one */
	param_off = param_pad + 32 + 21 + (n_setup << 1) + 2;

	/*
	 * Including the nt_unknown_secret value persuades netmon to
	 * display the correct data format for QueryPathInfo and
	 * QueryFileInfo.
	 */
	if (opcode == TRANS2_QUERY_FILE_INFORMATION ||
	    opcode == TRANS2_QUERY_PATH_INFORMATION) {
		data_pad = sizeof (uint16_t);
		data_off = param_off + n_param + data_pad;
		fmt = "bww2.wwwwwwb.Cw#.CwC";
		nt_unknown_secret = 0x0100;
	}
	else
	{
		data_pad = (param_off + n_param) & 1; /* Pad to short */
		/* Param off from hdr start */
		data_off = param_off + n_param + data_pad;
		fmt = "bww2.wwwwwwb.Cw#.C#.C";
		nt_unknown_secret = data_pad;
	}

	total_bytes = param_pad + n_param + data_pad + n_data;

	rc = smbsr_encode_result(sr, 10+n_setup, total_bytes,
	    fmt,
	    10 + n_setup,		/* wct */
	    n_param,			/* Total Parameter Bytes */
	    n_data /* + data_pad */,	/* Total Data Bytes */
	    n_param,			/* Total Parameter Bytes this buffer */
	    param_off,			/* Param offset from header start */
	    0,				/* Param displacement */
	    n_data /* + data_pad */,	/* Total Data Bytes this buffer */
	    data_off,			/* Data offset from header start */
	    0,				/* Data displacement */
	    n_setup,			/* suwcnt */
	    &xa->rep_setup_mb,		/* setup[] */
	    total_bytes,		/* Total data bytes */
	    param_pad,
	    &xa->rep_param_mb,
	    nt_unknown_secret,
	    &xa->rep_data_mb);
	return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);

trans_err_too_small:
	rc = NERR_BufTooSmall;
	goto trans_err;

trans_err_not_supported:
	rc = ERROR_NOT_SUPPORTED;
	goto trans_err;

trans_err:
	pos = MBC_LENGTH(&sr->reply) + 23;
	rc = smbsr_encode_result(sr, 10, 4, "bww2.wwwwwwb.www",
	    10,		/* wct */
	    4, 0,	/* tpscnt tdscnt */
	    4, pos, 0,	/* pscnt psoff psdisp */
	    0, 0, 0,	/* dscnt dsoff dsdisp */
	    0,		/* suwcnt */
	    4,		/* bcc */
	    rc,
	    0);		/* converter word? */
	return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
}

static uint32_t smb_xa_max_setup_count = 200;
static uint32_t smb_xa_max_param_count = 32 * 1024;
static uint32_t smb_xa_max_data_count  = 64 * 1024;

smb_xa_t *
smb_xa_create(
    smb_session_t	*session,
    smb_request_t	*sr,
    uint32_t		total_parameter_count,
    uint32_t		total_data_count,
    uint32_t		max_parameter_count,
    uint32_t		max_data_count,
    uint32_t		max_setup_count,
    uint32_t		setup_word_count)
{
	smb_xa_t	*xa, *nxa;
	smb_llist_t	*xlist;

	/*
	 * Sanity check what the client says it will send.
	 * Caller handles NULL return as ERRnoroom.
	 */
	if (setup_word_count > smb_xa_max_setup_count)
		return (NULL);
	if (total_parameter_count > smb_xa_max_param_count)
		return (NULL);
	if (total_data_count > smb_xa_max_data_count)
		return (NULL);

	/*
	 * Limit what the client asks us to allocate for
	 * returned setup, params, data.
	 */
	if (max_setup_count > smb_xa_max_setup_count)
		max_setup_count = smb_xa_max_setup_count;
	if (max_parameter_count > smb_xa_max_param_count)
		max_parameter_count = smb_xa_max_param_count;
	if (max_data_count > smb_xa_max_data_count)
		max_data_count = smb_xa_max_data_count;

	xa = kmem_zalloc(sizeof (smb_xa_t), KM_SLEEP);
	xa->xa_refcnt = 1;
	xa->smb_com = sr->smb_com;
	xa->smb_flg = sr->smb_flg;
	xa->smb_flg2 = sr->smb_flg2;
	xa->smb_tid = sr->smb_tid;
	xa->smb_pid = sr->smb_pid;
	xa->smb_uid = sr->smb_uid;
	xa->xa_smb_mid = sr->smb_mid;
	xa->xa_smb_fid = 0xFFFF;
	xa->reply_seqnum = sr->reply_seqnum;
	xa->smb_tpscnt = total_parameter_count;
	xa->smb_tdscnt = total_data_count;
	xa->smb_mprcnt = max_parameter_count;
	xa->smb_mdrcnt = max_data_count;
	xa->smb_msrcnt = max_setup_count;
	xa->smb_suwcnt = setup_word_count;
	xa->xa_session = session;
	xa->xa_magic = SMB_XA_MAGIC;

	/* request parts */
	xa->req_setup_mb.max_bytes = setup_word_count * 2;
	xa->req_param_mb.max_bytes = total_parameter_count;
	xa->req_data_mb.max_bytes  = total_data_count;

	/* reply parts */
	xa->rep_setup_mb.max_bytes = max_setup_count * 2;
	xa->rep_param_mb.max_bytes = max_parameter_count;
	xa->rep_data_mb.max_bytes =  max_data_count;

	/*
	 * The new xa structure is checked against the current list to see
	 * if it exists already.
	 */
	xlist = &session->s_xa_list;
	smb_llist_enter(xlist, RW_WRITER);
	nxa = smb_llist_head(xlist);
	while (nxa) {
		ASSERT(nxa->xa_magic == SMB_XA_MAGIC);
		if (nxa->xa_smb_mid == xa->xa_smb_mid &&
		    nxa->smb_pid == xa->smb_pid &&
		    !SMB_XA_CLOSED(nxa) &&
		    !(nxa->xa_flags & SMB_XA_FLAG_COMPLETE)) {
			smb_llist_exit(xlist);
			kmem_free(xa, sizeof (smb_xa_t));
			return (NULL);
		}
		nxa = smb_llist_next(xlist, nxa);
	}
	smb_llist_insert_tail(xlist, xa);
	smb_llist_exit(xlist);
	return (xa);
}

void
smb_xa_delete(smb_xa_t *xa)
{
	ASSERT(xa->xa_refcnt == 0);
	ASSERT(SMB_XA_CLOSED(xa));

	if (xa->xa_pipe_name)
		smb_mem_free(xa->xa_pipe_name);

	/* request parts */
	if (xa->req_setup_mb.chain != NULL)
		m_freem(xa->req_setup_mb.chain);
	if (xa->req_param_mb.chain != NULL)
		m_freem(xa->req_param_mb.chain);
	if (xa->req_data_mb.chain != NULL)
		m_freem(xa->req_data_mb.chain);

	/* reply parts */
	if (xa->rep_setup_mb.chain != NULL)
		m_freem(xa->rep_setup_mb.chain);
	if (xa->rep_param_mb.chain != NULL)
		m_freem(xa->rep_param_mb.chain);
	if (xa->rep_data_mb.chain != NULL)
		m_freem(xa->rep_data_mb.chain);

	xa->xa_magic = (uint32_t)~SMB_XA_MAGIC;
	kmem_free(xa, sizeof (smb_xa_t));
}

smb_xa_t *
smb_xa_hold(smb_xa_t *xa)
{
	mutex_enter(&xa->xa_mutex);
	xa->xa_refcnt++;
	ASSERT(xa->xa_refcnt);
	mutex_exit(&xa->xa_mutex);
	return (xa);
}

void
smb_xa_rele(smb_session_t *session, smb_xa_t *xa)
{
	mutex_enter(&xa->xa_mutex);
	ASSERT(xa->xa_refcnt);
	xa->xa_refcnt--;
	if (SMB_XA_CLOSED(xa) && (xa->xa_refcnt == 0)) {
		mutex_exit(&xa->xa_mutex);
		smb_llist_enter(&session->s_xa_list, RW_WRITER);
		smb_llist_remove(&session->s_xa_list, xa);
		smb_llist_exit(&session->s_xa_list);
		smb_xa_delete(xa);
		return;
	}
	mutex_exit(&xa->xa_mutex);
}

int
smb_xa_open(smb_xa_t *xa)
{
	int rc;

	mutex_enter(&xa->xa_mutex);

	ASSERT((xa->xa_flags & SMB_XA_FLAG_OPEN) == 0);

	if ((xa->xa_flags & SMB_XA_FLAG_CLOSE) == 0) {
		xa->xa_flags |= SMB_XA_FLAG_OPEN;
		rc = 0;
	} else {
		rc = ERROR_INVALID_HANDLE;
	}

	mutex_exit(&xa->xa_mutex);

	return (rc);
}

void
smb_xa_close(smb_xa_t *xa)
{
	mutex_enter(&xa->xa_mutex);
	xa->xa_flags |= SMB_XA_FLAG_CLOSE;
	xa->xa_flags &= ~SMB_XA_FLAG_OPEN;

	if (xa->xa_refcnt == 0) {
		mutex_exit(&xa->xa_mutex);
		smb_llist_enter(&xa->xa_session->s_xa_list, RW_WRITER);
		smb_llist_remove(&xa->xa_session->s_xa_list, xa);
		smb_llist_exit(&xa->xa_session->s_xa_list);
		smb_xa_delete(xa);
		return;
	}

	mutex_exit(&xa->xa_mutex);
}

int
smb_xa_complete(smb_xa_t *xa)
{
	int rc;

	mutex_enter(&xa->xa_mutex);
	if (xa->xa_flags & (SMB_XA_FLAG_COMPLETE | SMB_XA_FLAG_CLOSE)) {
		rc = 0; /* error ("not complete") */
	} else {
		rc = 1; /* Yes, "complete" */
		xa->xa_flags |= SMB_XA_FLAG_COMPLETE;

		/*
		 * During trans & trans-secondary processing,
		 * we copied the request data into these.
		 * Now we want to parse them, so we need to
		 * move the "finger" back to the beginning.
		 */
		xa->req_setup_mb.chain_offset = 0;
		xa->req_param_mb.chain_offset = 0;
		xa->req_data_mb.chain_offset  = 0;
	}

	mutex_exit(&xa->xa_mutex);
	return (rc);
}

smb_xa_t *
smb_xa_find(
    smb_session_t	*session,
    uint32_t		pid,
    uint16_t		mid)
{
	smb_xa_t	*xa;
	smb_llist_t	*xlist;

	xlist = &session->s_xa_list;
	smb_llist_enter(xlist, RW_READER);
	xa = smb_llist_head(xlist);
	while (xa) {
		mutex_enter(&xa->xa_mutex);
		if (xa->xa_smb_mid == mid &&
		    xa->smb_pid == pid &&
		    !SMB_XA_CLOSED(xa) &&
		    !(xa->xa_flags & SMB_XA_FLAG_COMPLETE)) {
			xa->xa_refcnt++;
			ASSERT(xa->xa_refcnt);
			mutex_exit(&xa->xa_mutex);
			break;
		}
		mutex_exit(&xa->xa_mutex);
		xa = smb_llist_next(xlist, xa);
	}
	smb_llist_exit(xlist);
	return (xa);
}