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 * Copyright 2022 RackTop Systems, Inc.
26 */
27
28 /*
29 * Dispatch function for SMB2_CHANGE_NOTIFY
30 */
31
32 #include <smbsrv/smb2_kproto.h>
33
34 /* For the output DataOffset fields in here. */
35 #define DATA_OFF (SMB2_HDR_SIZE + 8)
36
37 smb_sdrc_t
smb2_change_notify(smb_request_t * sr)38 smb2_change_notify(smb_request_t *sr)
39 {
40 uint16_t StructSize;
41 uint16_t iFlags;
42 uint32_t oBufLength;
43 smb2fid_t smb2fid;
44 uint32_t CompletionFilter;
45 uint32_t reserved;
46 uint32_t status;
47 int rc = 0;
48
49 /*
50 * SMB2 Change Notify request
51 */
52 rc = smb_mbc_decodef(
53 &sr->smb_data, "wwlqqll",
54 &StructSize, /* w */
55 &iFlags, /* w */
56 &oBufLength, /* l */
57 &smb2fid.persistent, /* q */
58 &smb2fid.temporal, /* q */
59 &CompletionFilter, /* l */
60 &reserved); /* l */
61 if (rc || StructSize != 32)
62 return (SDRC_ERROR);
63
64 status = smb2sr_lookup_fid(sr, &smb2fid);
65 DTRACE_SMB2_START(op__ChangeNotify, smb_request_t *, sr);
66
67 if (status != 0)
68 goto errout; /* Bad FID */
69
70 /*
71 * Only deal with change notify last in a compound,
72 * because it blocks indefinitely. This status gets
73 * "sticky" handling in smb2sr_work().
74 */
75 if (sr->smb2_next_command != 0) {
76 status = NT_STATUS_INSUFFICIENT_RESOURCES;
77 goto errout;
78 }
79
80 CompletionFilter &= FILE_NOTIFY_VALID_MASK;
81 if (iFlags & SMB2_WATCH_TREE)
82 CompletionFilter |= FILE_NOTIFY_CHANGE_EV_SUBDIR;
83
84 if (oBufLength > smb2_max_trans) {
85 status = NT_STATUS_INVALID_PARAMETER;
86 goto errout;
87 }
88
89 /*
90 * Check for events and consume, non-blocking.
91 * Special return STATUS_PENDING means:
92 * No events; caller must call "act2" next.
93 * SMB2 does that in "async mode".
94 */
95 status = smb_notify_act1(sr, oBufLength, CompletionFilter);
96 if (status == NT_STATUS_PENDING) {
97 status = smb2sr_go_async(sr);
98 if (status != 0)
99 goto errout;
100 status = smb_notify_act2(sr);
101 if (status == NT_STATUS_PENDING) {
102 /* See next: smb2_change_notify_finish */
103 return (SDRC_SR_KEPT);
104 }
105 }
106
107 errout:
108 sr->smb2_status = status;
109 DTRACE_SMB2_DONE(op__ChangeNotify, smb_request_t *, sr);
110
111 if (NT_SC_SEVERITY(status) == NT_STATUS_SEVERITY_SUCCESS) {
112 oBufLength = sr->raw_data.chain_offset;
113 (void) smb_mbc_encodef(
114 &sr->reply, "wwlC",
115 9, /* StructSize */ /* w */
116 DATA_OFF, /* w */
117 oBufLength, /* l */
118 &sr->raw_data); /* C */
119 } else {
120 smb2sr_put_error(sr, status);
121 }
122
123 return (SDRC_SUCCESS);
124 }
125
126 /*
127 * This is called via taskq_dispatch in smb_notify.c
128 * to finish up an NT transact notify change request.
129 * Build an SMB2 Change Notify reply and send it.
130 */
131 void
smb2_change_notify_finish(void * arg)132 smb2_change_notify_finish(void *arg)
133 {
134 smb_request_t *sr = arg;
135 smb_disp_stats_t *sds;
136 uint32_t status;
137 uint32_t oBufLength;
138
139 SMB_REQ_VALID(sr);
140
141 /*
142 * Common part of notify, puts data in sr->raw_data
143 */
144 status = smb_notify_act3(sr);
145
146 /*
147 * The prior thread returned SDRC_SR_KEPT and skiped
148 * the dtrace DONE probe, so fire that here.
149 */
150 sr->smb2_status = status;
151 DTRACE_SMB2_DONE(op__ChangeNotify, smb_request_t *, sr);
152
153 if (NT_SC_SEVERITY(status) == NT_STATUS_SEVERITY_SUCCESS) {
154 oBufLength = sr->raw_data.chain_offset;
155 (void) smb_mbc_encodef(
156 &sr->reply, "wwlC",
157 9, /* StructSize */ /* w */
158 DATA_OFF, /* w */
159 oBufLength, /* l */
160 &sr->raw_data); /* C */
161 } else {
162 smb2sr_put_error(sr, status);
163 }
164
165 /*
166 * Record some statistics: (just tx bytes here)
167 */
168 sds = &sr->session->s_server->sv_disp_stats2[SMB2_CHANGE_NOTIFY];
169 atomic_add_64(&sds->sdt_txb, (int64_t)(sr->reply.chain_offset));
170
171 /*
172 * Put (overwrite) the final SMB2 header,
173 * sign, send.
174 */
175 (void) smb2_encode_header(sr, B_TRUE);
176 if (sr->smb2_hdr_flags & SMB2_FLAGS_SIGNED)
177 smb2_sign_reply(sr);
178 smb2_send_reply(sr);
179
180 mutex_enter(&sr->sr_mutex);
181 sr->sr_state = SMB_REQ_STATE_COMPLETED;
182 mutex_exit(&sr->sr_mutex);
183
184 smb_request_free(sr);
185 }
186