smb2_change_notify.c revision 93bc28dbaee6387120d48b12b3dc1ba5f7418e6e
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates.
24 * Copyright 2017 Nexenta Systems, Inc.  All rights reserved.
25 */
26
27/*
28 * Dispatch function for SMB2_CHANGE_NOTIFY
29 */
30
31#include <smbsrv/smb2_kproto.h>
32
33/* For the output DataOffset fields in here. */
34#define	DATA_OFF	(SMB2_HDR_SIZE + 8)
35
36static smb_sdrc_t smb2_change_notify_async(smb_request_t *);
37
38smb_sdrc_t
39smb2_change_notify(smb_request_t *sr)
40{
41	uint16_t StructSize;
42	uint16_t iFlags;
43	uint32_t oBufLength;
44	smb2fid_t smb2fid;
45	uint32_t CompletionFilter;
46	uint32_t reserved;
47	uint32_t status;
48	int rc = 0;
49
50	/*
51	 * SMB2 Change Notify request
52	 */
53	rc = smb_mbc_decodef(
54	    &sr->smb_data,		"wwlqqll",
55	    &StructSize,		/* w */
56	    &iFlags,			/* w */
57	    &oBufLength,		/* l */
58	    &smb2fid.persistent,	/* q */
59	    &smb2fid.temporal,		/* q */
60	    &CompletionFilter,		/* l */
61	    &reserved);			/* l */
62	if (rc || StructSize != 32)
63		return (SDRC_ERROR);
64
65	status = smb2sr_lookup_fid(sr, &smb2fid);
66	DTRACE_SMB2_START(op__ChangeNotify, smb_request_t *, sr);
67
68	if (status != 0)
69		goto errout; /* Bad FID */
70
71	CompletionFilter &= FILE_NOTIFY_VALID_MASK;
72	if (iFlags & SMB2_WATCH_TREE)
73		CompletionFilter |= FILE_NOTIFY_CHANGE_EV_SUBDIR;
74
75	if (oBufLength > smb2_max_trans)
76		oBufLength = smb2_max_trans;
77
78	/*
79	 * Check for events and consume, non-blocking.
80	 * Special return STATUS_PENDING means:
81	 *   No events; caller must call "act2" next.
82	 * SMB2 does that in the "async" handler.
83	 */
84	status = smb_notify_act1(sr, oBufLength, CompletionFilter);
85	if (status == NT_STATUS_PENDING) {
86		status = smb2sr_go_async(sr, smb2_change_notify_async);
87	}
88
89errout:
90	sr->smb2_status = status;
91	if (status != NT_STATUS_PENDING) {
92		DTRACE_SMB2_DONE(op__ChangeNotify, smb_request_t *, sr);
93	}
94
95	if (NT_SC_SEVERITY(status) == NT_STATUS_SEVERITY_SUCCESS) {
96		oBufLength = sr->raw_data.chain_offset;
97		(void) smb_mbc_encodef(
98		    &sr->reply, "wwlC",
99		    9,	/* StructSize */	/* w */
100		    DATA_OFF,			/* w */
101		    oBufLength,			/* l */
102		    &sr->raw_data);		/* C */
103	} else {
104		smb2sr_put_error(sr, status);
105	}
106
107	return (SDRC_SUCCESS);
108}
109
110/*
111 * This is called when the dispatch loop has made it to the end of a
112 * compound request, and we had a notify that will require blocking.
113 */
114static smb_sdrc_t
115smb2_change_notify_async(smb_request_t *sr)
116{
117	uint32_t status;
118
119	status = smb_notify_act2(sr);
120	if (status == NT_STATUS_PENDING) {
121		/* See next: smb2_change_notify_finish */
122		return (SDRC_SR_KEPT);
123	}
124
125	/* Note: Never NT_STATUS_NOTIFY_ENUM_DIR here. */
126	ASSERT(status != NT_STATUS_NOTIFY_ENUM_DIR);
127
128	if (status != 0)
129		smb2sr_put_error(sr, status);
130
131	return (SDRC_SUCCESS);
132}
133
134/*
135 * This is called via taskq_dispatch in smb_notify.c
136 * to finish up an NT transact notify change request.
137 * Build an SMB2 Change Notify reply and send it.
138 */
139void
140smb2_change_notify_finish(void *arg)
141{
142	smb_request_t	*sr = arg;
143	uint32_t status;
144	uint32_t oBufLength;
145
146	SMB_REQ_VALID(sr);
147
148	/*
149	 * Common part of notify, puts data in sr->raw_data
150	 */
151	status = smb_notify_act3(sr);
152
153	sr->smb2_status = status;
154	DTRACE_SMB2_DONE(op__ChangeNotify, smb_request_t *, sr);
155
156	if (NT_SC_SEVERITY(status) == NT_STATUS_SEVERITY_SUCCESS) {
157		oBufLength = sr->raw_data.chain_offset;
158		(void) smb_mbc_encodef(
159		    &sr->reply, "wwlC",
160		    9,	/* StructSize */	/* w */
161		    DATA_OFF,			/* w */
162		    oBufLength,			/* l */
163		    &sr->raw_data);		/* C */
164	} else {
165		smb2sr_put_error(sr, status);
166	}
167
168	smb2sr_finish_async(sr);
169}
170