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 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 * 25 * Copyright 2017 Nexenta Systems, Inc. All rights reserved. 26 */ 27 28 /* 29 * SMB: nt_cancel 30 * 31 * This SMB allows a client to cancel a request currently pending at the 32 * server. 33 * 34 * Client Request Description 35 * ================================== ================================= 36 * 37 * UCHAR WordCount; No words are sent (== 0) 38 * USHORT ByteCount; No bytes (==0) 39 * 40 * The Sid, Uid, Pid, Tid, and Mid fields of the SMB are used to locate an 41 * pending server request from this session. If a pending request is 42 * found, it is "hurried along" which may result in success or failure of 43 * the original request. No other response is generated for this SMB. 44 */ 45 46 #include <smbsrv/smb_kproto.h> 47 48 smb_sdrc_t 49 smb_pre_nt_cancel(smb_request_t *sr) 50 { 51 DTRACE_SMB_START(op__NtCancel, smb_request_t *, sr); 52 return (SDRC_SUCCESS); 53 } 54 55 void 56 smb_post_nt_cancel(smb_request_t *sr) 57 { 58 DTRACE_SMB_DONE(op__NtCancel, smb_request_t *, sr); 59 } 60 61 /* 62 * Dispatch handler for SMB_COM_NT_CANCEL. 63 * Note that Cancel does NOT get a response. 64 * 65 * SMB NT Cancel has an inherent race with the request being 66 * cancelled. See comments at smb_request_cancel(). 67 */ 68 smb_sdrc_t 69 smb_com_nt_cancel(smb_request_t *sr) 70 { 71 struct smb_request *req; 72 struct smb_session *session; 73 int cnt = 0; 74 75 session = sr->session; 76 77 smb_slist_enter(&session->s_req_list); 78 req = smb_slist_head(&session->s_req_list); 79 while (req) { 80 ASSERT(req->sr_magic == SMB_REQ_MAGIC); 81 if ((req != sr) && 82 (req->smb_uid == sr->smb_uid) && 83 (req->smb_pid == sr->smb_pid) && 84 (req->smb_tid == sr->smb_tid) && 85 (req->smb_mid == sr->smb_mid)) { 86 smb_request_cancel(req); 87 cnt++; 88 } 89 req = smb_slist_next(&session->s_req_list, req); 90 } 91 if (cnt != 1) { 92 DTRACE_PROBE2(smb__ntcancel__error, 93 uint16_t, sr->smb_mid, int, cnt); 94 } 95 smb_slist_exit(&session->s_req_list); 96 97 return (SDRC_NO_REPLY); 98 } 99 100 /* 101 * This handles an SMB_COM_NT_CANCEL request when seen in the reader. 102 * (See smb1sr_newrq) Handle this immediately, rather than 103 * going through the normal taskq dispatch mechanism. 104 * Note that Cancel does NOT get a response. 105 */ 106 int 107 smb1sr_newrq_cancel(smb_request_t *sr) 108 { 109 (void) smb_pre_nt_cancel(sr); 110 (void) smb_com_nt_cancel(sr); 111 smb_post_nt_cancel(sr); 112 return (0); 113 } 114