smb2_change_notify.c revision bfe5e737326ea1aafea02849716d8aceacf5c2eb
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 2016 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	if (status != 0)
67		goto puterror;
68
69	CompletionFilter &= FILE_NOTIFY_VALID_MASK;
70	if (iFlags & SMB2_WATCH_TREE)
71		CompletionFilter |= FILE_NOTIFY_CHANGE_EV_SUBDIR;
72
73	if (oBufLength > smb2_max_trans)
74		oBufLength = smb2_max_trans;
75
76	/*
77	 * Check for events and consume, non-blocking.
78	 * Special return STATUS_PENDING means:
79	 *   No events; caller must call "act2" next.
80	 * SMB2 does that in the "async" handler.
81	 */
82	status = smb_notify_act1(sr, oBufLength, CompletionFilter);
83	if (status == NT_STATUS_PENDING) {
84		status = smb2sr_go_async(sr, smb2_change_notify_async);
85	}
86
87	if (NT_SC_SEVERITY(status) == NT_STATUS_SEVERITY_SUCCESS) {
88		sr->smb2_status = status;
89
90		oBufLength = sr->raw_data.chain_offset;
91		(void) smb_mbc_encodef(
92		    &sr->reply, "wwlC",
93		    9,	/* StructSize */	/* w */
94		    DATA_OFF,			/* w */
95		    oBufLength,			/* l */
96		    &sr->raw_data);		/* C */
97	} else {
98	puterror:
99		smb2sr_put_error(sr, status);
100	}
101
102	return (SDRC_SUCCESS);
103}
104
105/*
106 * This is called when the dispatch loop has made it to the end of a
107 * compound request, and we had a notify that will require blocking.
108 */
109static smb_sdrc_t
110smb2_change_notify_async(smb_request_t *sr)
111{
112	uint32_t status;
113
114	status = smb_notify_act2(sr);
115	if (status == NT_STATUS_PENDING) {
116		/* See next: smb2_change_notify_finish */
117		return (SDRC_SR_KEPT);
118	}
119
120	/* Note: Never NT_STATUS_NOTIFY_ENUM_DIR here. */
121	ASSERT(status != NT_STATUS_NOTIFY_ENUM_DIR);
122
123	if (status != 0)
124		smb2sr_put_error(sr, status);
125
126	return (SDRC_SUCCESS);
127}
128
129/*
130 * This is called via taskq_dispatch in smb_notify.c
131 * to finish up an NT transact notify change request.
132 * Build an SMB2 Change Notify reply and send it.
133 */
134void
135smb2_change_notify_finish(void *arg)
136{
137	smb_request_t	*sr = arg;
138	uint32_t status;
139	uint32_t oBufLength;
140
141	SMB_REQ_VALID(sr);
142
143	/*
144	 * Common part of notify, puts data in sr->raw_data
145	 */
146	status = smb_notify_act3(sr);
147	if (NT_SC_SEVERITY(status) == NT_STATUS_SEVERITY_SUCCESS) {
148		sr->smb2_status = status;
149
150		oBufLength = sr->raw_data.chain_offset;
151		(void) smb_mbc_encodef(
152		    &sr->reply, "wwlC",
153		    9,	/* StructSize */	/* w */
154		    DATA_OFF,			/* w */
155		    oBufLength,			/* l */
156		    &sr->raw_data);		/* C */
157	} else {
158		smb2sr_put_error(sr, status);
159	}
160
161	smb2sr_finish_async(sr);
162}
163