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 2018 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
36 smb_sdrc_t
37 smb2_change_notify(smb_request_t *sr)
38 {
39 uint16_t StructSize;
40 uint16_t iFlags;
41 uint32_t oBufLength;
42 smb2fid_t smb2fid;
43 uint32_t CompletionFilter;
44 uint32_t reserved;
45 uint32_t status;
46 int rc = 0;
47
48 /*
49 * SMB2 Change Notify request
50 */
51 rc = smb_mbc_decodef(
52 &sr->smb_data, "wwlqqll",
53 &StructSize, /* w */
54 &iFlags, /* w */
55 &oBufLength, /* l */
56 &smb2fid.persistent, /* q */
57 &smb2fid.temporal, /* q */
58 &CompletionFilter, /* l */
59 &reserved); /* l */
60 if (rc || StructSize != 32)
61 return (SDRC_ERROR);
62
63 status = smb2sr_lookup_fid(sr, &smb2fid);
64 DTRACE_SMB2_START(op__ChangeNotify, smb_request_t *, sr);
65
66 if (status != 0)
67 goto errout; /* Bad FID */
68
69 /*
70 * Only deal with change notify last in a compound,
71 * because it blocks indefinitely. This status gets
72 * "sticky" handling in smb2sr_work().
73 */
74 if (sr->smb2_next_command != 0) {
75 status = NT_STATUS_INSUFFICIENT_RESOURCES;
76 goto errout;
77 }
78
79 CompletionFilter &= FILE_NOTIFY_VALID_MASK;
80 if (iFlags & SMB2_WATCH_TREE)
81 CompletionFilter |= FILE_NOTIFY_CHANGE_EV_SUBDIR;
82
83 if (oBufLength > smb2_max_trans)
84 oBufLength = smb2_max_trans;
85
86 /*
87 * Check for events and consume, non-blocking.
88 * Special return STATUS_PENDING means:
89 * No events; caller must call "act2" next.
90 * SMB2 does that in "async mode".
91 */
92 status = smb_notify_act1(sr, oBufLength, CompletionFilter);
93 if (status == NT_STATUS_PENDING) {
94 status = smb2sr_go_async(sr);
95 if (status != 0)
96 goto errout;
97 status = smb_notify_act2(sr);
98 if (status == NT_STATUS_PENDING) {
99 /* See next: smb2_change_notify_finish */
100 return (SDRC_SR_KEPT);
101 }
102 }
103
104 errout:
105 sr->smb2_status = status;
106 DTRACE_SMB2_DONE(op__ChangeNotify, smb_request_t *, sr);
107
108 if (NT_SC_SEVERITY(status) == NT_STATUS_SEVERITY_SUCCESS) {
109 oBufLength = sr->raw_data.chain_offset;
110 (void) smb_mbc_encodef(
111 &sr->reply, "wwlC",
112 9, /* StructSize */ /* w */
113 DATA_OFF, /* w */
114 oBufLength, /* l */
115 &sr->raw_data); /* C */
116 } else {
117 smb2sr_put_error(sr, status);
118 }
119
120 return (SDRC_SUCCESS);
121 }
122
123 /*
124 * This is called via taskq_dispatch in smb_notify.c
125 * to finish up an NT transact notify change request.
126 * Build an SMB2 Change Notify reply and send it.
127 */
128 void
129 smb2_change_notify_finish(void *arg)
130 {
131 smb_request_t *sr = arg;
132 smb_disp_stats_t *sds;
133 uint32_t status;
134 uint32_t oBufLength;
135
136 SMB_REQ_VALID(sr);
137
138 /*
139 * Common part of notify, puts data in sr->raw_data
140 */
141 status = smb_notify_act3(sr);
142
143 /*
144 * The prior thread returned SDRC_SR_KEPT and skiped
145 * the dtrace DONE probe, so fire that here.
146 */
147 sr->smb2_status = status;
148 DTRACE_SMB2_DONE(op__ChangeNotify, smb_request_t *, sr);
149
150 if (NT_SC_SEVERITY(status) == NT_STATUS_SEVERITY_SUCCESS) {
151 oBufLength = sr->raw_data.chain_offset;
152 (void) smb_mbc_encodef(
153 &sr->reply, "wwlC",
154 9, /* StructSize */ /* w */
155 DATA_OFF, /* w */
156 oBufLength, /* l */
157 &sr->raw_data); /* C */
158 } else {
159 smb2sr_put_error(sr, status);
160 }
161
162 /*
163 * Record some statistics: (just tx bytes here)
164 */
165 sds = &sr->session->s_server->sv_disp_stats2[SMB2_CHANGE_NOTIFY];
166 atomic_add_64(&sds->sdt_txb, (int64_t)(sr->reply.chain_offset));
167
168 /*
169 * Put (overwrite) the final SMB2 header,
170 * sign, send.
171 */
172 (void) smb2_encode_header(sr, B_TRUE);
173 if (sr->smb2_hdr_flags & SMB2_FLAGS_SIGNED)
174 smb2_sign_reply(sr);
175 smb2_send_reply(sr);
176
177 mutex_enter(&sr->sr_mutex);
178 sr->sr_state = SMB_REQ_STATE_COMPLETED;
179 mutex_exit(&sr->sr_mutex);
180
181 smb_request_free(sr);
182 }