![Pavel Shilovsky](/assets/img/avatar_default.png)
Since both CIFS and SMB2 use ses->capabilities (server->capabilities) field but flags are different we should make such checks protocol independent. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
1126 lines
30 KiB
C
1126 lines
30 KiB
C
/*
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* fs/cifs/smb2pdu.c
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*
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* Copyright (C) International Business Machines Corp., 2009, 2011
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* Etersoft, 2012
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* Author(s): Steve French (sfrench@us.ibm.com)
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* Pavel Shilovsky (pshilovsky@samba.org) 2012
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*
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* Contains the routines for constructing the SMB2 PDUs themselves
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
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/* Note that there are handle based routines which must be */
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/* treated slightly differently for reconnection purposes since we never */
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/* want to reuse a stale file handle and only the caller knows the file info */
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/vfs.h>
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#include <linux/uaccess.h>
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#include <linux/xattr.h>
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#include "smb2pdu.h"
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#include "cifsglob.h"
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#include "cifsacl.h"
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#include "cifsproto.h"
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#include "smb2proto.h"
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#include "cifs_unicode.h"
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#include "cifs_debug.h"
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#include "ntlmssp.h"
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#include "smb2status.h"
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/*
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* The following table defines the expected "StructureSize" of SMB2 requests
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* in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
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*
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* Note that commands are defined in smb2pdu.h in le16 but the array below is
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* indexed by command in host byte order.
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*/
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static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
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/* SMB2_NEGOTIATE */ 36,
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/* SMB2_SESSION_SETUP */ 25,
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/* SMB2_LOGOFF */ 4,
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/* SMB2_TREE_CONNECT */ 9,
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/* SMB2_TREE_DISCONNECT */ 4,
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/* SMB2_CREATE */ 57,
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/* SMB2_CLOSE */ 24,
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/* SMB2_FLUSH */ 24,
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/* SMB2_READ */ 49,
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/* SMB2_WRITE */ 49,
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/* SMB2_LOCK */ 48,
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/* SMB2_IOCTL */ 57,
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/* SMB2_CANCEL */ 4,
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/* SMB2_ECHO */ 4,
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/* SMB2_QUERY_DIRECTORY */ 33,
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/* SMB2_CHANGE_NOTIFY */ 32,
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/* SMB2_QUERY_INFO */ 41,
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/* SMB2_SET_INFO */ 33,
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/* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
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};
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static void
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smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
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const struct cifs_tcon *tcon)
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{
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struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
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char *temp = (char *)hdr;
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/* lookup word count ie StructureSize from table */
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__u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
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/*
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* smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
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* largest operations (Create)
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*/
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memset(temp, 0, 256);
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/* Note this is only network field converted to big endian */
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hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
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- 4 /* RFC 1001 length field itself not counted */);
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hdr->ProtocolId[0] = 0xFE;
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hdr->ProtocolId[1] = 'S';
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hdr->ProtocolId[2] = 'M';
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hdr->ProtocolId[3] = 'B';
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hdr->StructureSize = cpu_to_le16(64);
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hdr->Command = smb2_cmd;
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hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
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hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
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if (!tcon)
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goto out;
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hdr->TreeId = tcon->tid;
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/* Uid is not converted */
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if (tcon->ses)
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hdr->SessionId = tcon->ses->Suid;
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/* BB check following DFS flags BB */
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/* BB do we have to add check for SHI1005_FLAGS_DFS_ROOT too? */
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if (tcon->share_flags & SHI1005_FLAGS_DFS)
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hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS;
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/* BB how does SMB2 do case sensitive? */
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/* if (tcon->nocase)
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hdr->Flags |= SMBFLG_CASELESS; */
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/* if (tcon->ses && tcon->ses->server &&
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(tcon->ses->server->sec_mode & SECMODE_SIGN_REQUIRED))
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hdr->Flags |= SMB2_FLAGS_SIGNED; */
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out:
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pdu->StructureSize2 = cpu_to_le16(parmsize);
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return;
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}
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static int
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smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
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{
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int rc = 0;
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struct nls_table *nls_codepage;
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struct cifs_ses *ses;
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struct TCP_Server_Info *server;
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/*
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* SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
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* check for tcp and smb session status done differently
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* for those three - in the calling routine.
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*/
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if (tcon == NULL)
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return rc;
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if (smb2_command == SMB2_TREE_CONNECT)
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return rc;
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if (tcon->tidStatus == CifsExiting) {
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/*
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* only tree disconnect, open, and write,
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* (and ulogoff which does not have tcon)
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* are allowed as we start force umount.
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*/
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if ((smb2_command != SMB2_WRITE) &&
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(smb2_command != SMB2_CREATE) &&
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(smb2_command != SMB2_TREE_DISCONNECT)) {
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cFYI(1, "can not send cmd %d while umounting",
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smb2_command);
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return -ENODEV;
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}
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}
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if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
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(!tcon->ses->server))
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return -EIO;
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ses = tcon->ses;
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server = ses->server;
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/*
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* Give demultiplex thread up to 10 seconds to reconnect, should be
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* greater than cifs socket timeout which is 7 seconds
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*/
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while (server->tcpStatus == CifsNeedReconnect) {
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/*
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* Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
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* here since they are implicitly done when session drops.
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*/
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switch (smb2_command) {
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/*
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* BB Should we keep oplock break and add flush to exceptions?
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*/
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case SMB2_TREE_DISCONNECT:
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case SMB2_CANCEL:
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case SMB2_CLOSE:
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case SMB2_OPLOCK_BREAK:
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return -EAGAIN;
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}
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wait_event_interruptible_timeout(server->response_q,
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(server->tcpStatus != CifsNeedReconnect), 10 * HZ);
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/* are we still trying to reconnect? */
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if (server->tcpStatus != CifsNeedReconnect)
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break;
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/*
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* on "soft" mounts we wait once. Hard mounts keep
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* retrying until process is killed or server comes
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* back on-line
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*/
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if (!tcon->retry) {
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cFYI(1, "gave up waiting on reconnect in smb_init");
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return -EHOSTDOWN;
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}
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}
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if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
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return rc;
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nls_codepage = load_nls_default();
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/*
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* need to prevent multiple threads trying to simultaneously reconnect
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* the same SMB session
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*/
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mutex_lock(&tcon->ses->session_mutex);
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rc = cifs_negotiate_protocol(0, tcon->ses);
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if (!rc && tcon->ses->need_reconnect)
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rc = cifs_setup_session(0, tcon->ses, nls_codepage);
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if (rc || !tcon->need_reconnect) {
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mutex_unlock(&tcon->ses->session_mutex);
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goto out;
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}
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cifs_mark_open_files_invalid(tcon);
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rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
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mutex_unlock(&tcon->ses->session_mutex);
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cFYI(1, "reconnect tcon rc = %d", rc);
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if (rc)
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goto out;
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atomic_inc(&tconInfoReconnectCount);
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/*
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* BB FIXME add code to check if wsize needs update due to negotiated
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* smb buffer size shrinking.
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*/
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out:
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/*
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* Check if handle based operation so we know whether we can continue
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* or not without returning to caller to reset file handle.
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*/
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/*
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* BB Is flush done by server on drop of tcp session? Should we special
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* case it and skip above?
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*/
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switch (smb2_command) {
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case SMB2_FLUSH:
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case SMB2_READ:
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case SMB2_WRITE:
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case SMB2_LOCK:
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case SMB2_IOCTL:
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case SMB2_QUERY_DIRECTORY:
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case SMB2_CHANGE_NOTIFY:
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case SMB2_QUERY_INFO:
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case SMB2_SET_INFO:
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return -EAGAIN;
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}
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unload_nls(nls_codepage);
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return rc;
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}
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/*
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* Allocate and return pointer to an SMB request hdr, and set basic
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* SMB information in the SMB header. If the return code is zero, this
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* function must have filled in request_buf pointer.
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*/
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static int
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small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
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void **request_buf)
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{
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int rc = 0;
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rc = smb2_reconnect(smb2_command, tcon);
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if (rc)
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return rc;
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/* BB eventually switch this to SMB2 specific small buf size */
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*request_buf = cifs_small_buf_get();
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if (*request_buf == NULL) {
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/* BB should we add a retry in here if not a writepage? */
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return -ENOMEM;
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}
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smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
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if (tcon != NULL) {
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#ifdef CONFIG_CIFS_STATS2
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uint16_t com_code = le16_to_cpu(smb2_command);
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cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
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#endif
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cifs_stats_inc(&tcon->num_smbs_sent);
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}
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return rc;
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}
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static void
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free_rsp_buf(int resp_buftype, void *rsp)
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{
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if (resp_buftype == CIFS_SMALL_BUFFER)
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cifs_small_buf_release(rsp);
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else if (resp_buftype == CIFS_LARGE_BUFFER)
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cifs_buf_release(rsp);
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}
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#define SMB2_NUM_PROT 1
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#define SMB2_PROT 0
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#define SMB21_PROT 1
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#define BAD_PROT 0xFFFF
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#define SMB2_PROT_ID 0x0202
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#define SMB21_PROT_ID 0x0210
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#define BAD_PROT_ID 0xFFFF
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static struct {
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int index;
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__le16 name;
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} smb2protocols[] = {
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{SMB2_PROT, cpu_to_le16(SMB2_PROT_ID)},
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{SMB21_PROT, cpu_to_le16(SMB21_PROT_ID)},
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{BAD_PROT, cpu_to_le16(BAD_PROT_ID)}
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};
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/*
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*
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* SMB2 Worker functions follow:
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*
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* The general structure of the worker functions is:
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* 1) Call smb2_init (assembles SMB2 header)
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* 2) Initialize SMB2 command specific fields in fixed length area of SMB
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* 3) Call smb_sendrcv2 (sends request on socket and waits for response)
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* 4) Decode SMB2 command specific fields in the fixed length area
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* 5) Decode variable length data area (if any for this SMB2 command type)
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* 6) Call free smb buffer
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* 7) return
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*
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*/
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int
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SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
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{
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struct smb2_negotiate_req *req;
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struct smb2_negotiate_rsp *rsp;
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struct kvec iov[1];
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int rc = 0;
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int resp_buftype;
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struct TCP_Server_Info *server;
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unsigned int sec_flags;
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u16 i;
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u16 temp = 0;
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int blob_offset, blob_length;
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char *security_blob;
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int flags = CIFS_NEG_OP;
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cFYI(1, "Negotiate protocol");
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if (ses->server)
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server = ses->server;
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else {
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rc = -EIO;
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return rc;
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}
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rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
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if (rc)
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return rc;
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/* if any of auth flags (ie not sign or seal) are overriden use them */
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if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
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sec_flags = ses->overrideSecFlg; /* BB FIXME fix sign flags?*/
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else /* if override flags set only sign/seal OR them with global auth */
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sec_flags = global_secflags | ses->overrideSecFlg;
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cFYI(1, "sec_flags 0x%x", sec_flags);
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req->hdr.SessionId = 0;
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for (i = 0; i < SMB2_NUM_PROT; i++)
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req->Dialects[i] = smb2protocols[i].name;
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req->DialectCount = cpu_to_le16(i);
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inc_rfc1001_len(req, i * 2);
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/* only one of SMB2 signing flags may be set in SMB2 request */
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if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
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temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
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else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
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temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
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req->SecurityMode = cpu_to_le16(temp);
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req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
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iov[0].iov_base = (char *)req;
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/* 4 for rfc1002 length field */
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iov[0].iov_len = get_rfc1002_length(req) + 4;
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rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
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rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
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/*
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* No tcon so can't do
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* cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
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*/
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if (rc != 0)
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goto neg_exit;
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if (rsp == NULL) {
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rc = -EIO;
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goto neg_exit;
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}
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cFYI(1, "mode 0x%x", rsp->SecurityMode);
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if (rsp->DialectRevision == smb2protocols[SMB21_PROT].name)
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cFYI(1, "negotiated smb2.1 dialect");
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else if (rsp->DialectRevision == smb2protocols[SMB2_PROT].name)
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cFYI(1, "negotiated smb2 dialect");
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else {
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cERROR(1, "Illegal dialect returned by server %d",
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le16_to_cpu(rsp->DialectRevision));
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rc = -EIO;
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goto neg_exit;
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}
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server->dialect = le16_to_cpu(rsp->DialectRevision);
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server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
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server->max_read = le32_to_cpu(rsp->MaxReadSize);
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server->max_write = le32_to_cpu(rsp->MaxWriteSize);
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/* BB Do we need to validate the SecurityMode? */
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server->sec_mode = le16_to_cpu(rsp->SecurityMode);
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server->capabilities = le32_to_cpu(rsp->Capabilities);
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/* Internal types */
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server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
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security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
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&rsp->hdr);
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if (blob_length == 0) {
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cERROR(1, "missing security blob on negprot");
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rc = -EIO;
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goto neg_exit;
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}
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#ifdef CONFIG_SMB2_ASN1 /* BB REMOVEME when updated asn1.c ready */
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rc = decode_neg_token_init(security_blob, blob_length,
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&server->sec_type);
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if (rc == 1)
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rc = 0;
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else if (rc == 0) {
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rc = -EIO;
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goto neg_exit;
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}
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#endif
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|
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neg_exit:
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free_rsp_buf(resp_buftype, rsp);
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return rc;
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}
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|
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int
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SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
|
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const struct nls_table *nls_cp)
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{
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struct smb2_sess_setup_req *req;
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struct smb2_sess_setup_rsp *rsp = NULL;
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struct kvec iov[2];
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int rc = 0;
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int resp_buftype;
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__le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
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struct TCP_Server_Info *server;
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unsigned int sec_flags;
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u8 temp = 0;
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u16 blob_length = 0;
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char *security_blob;
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char *ntlmssp_blob = NULL;
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bool use_spnego = false; /* else use raw ntlmssp */
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|
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cFYI(1, "Session Setup");
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|
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if (ses->server)
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server = ses->server;
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else {
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rc = -EIO;
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return rc;
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}
|
|
|
|
/*
|
|
* If memory allocation is successful, caller of this function
|
|
* frees it.
|
|
*/
|
|
ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
|
|
if (!ses->ntlmssp)
|
|
return -ENOMEM;
|
|
|
|
ses->server->secType = RawNTLMSSP;
|
|
|
|
ssetup_ntlmssp_authenticate:
|
|
if (phase == NtLmChallenge)
|
|
phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
|
|
|
|
rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* if any of auth flags (ie not sign or seal) are overriden use them */
|
|
if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
|
|
sec_flags = ses->overrideSecFlg; /* BB FIXME fix sign flags?*/
|
|
else /* if override flags set only sign/seal OR them with global auth */
|
|
sec_flags = global_secflags | ses->overrideSecFlg;
|
|
|
|
cFYI(1, "sec_flags 0x%x", sec_flags);
|
|
|
|
req->hdr.SessionId = 0; /* First session, not a reauthenticate */
|
|
req->VcNumber = 0; /* MBZ */
|
|
/* to enable echos and oplocks */
|
|
req->hdr.CreditRequest = cpu_to_le16(3);
|
|
|
|
/* only one of SMB2 signing flags may be set in SMB2 request */
|
|
if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
|
|
temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
|
|
else if (ses->server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED)
|
|
temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
|
|
else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
|
|
temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
|
|
|
|
req->SecurityMode = temp;
|
|
req->Capabilities = 0;
|
|
req->Channel = 0; /* MBZ */
|
|
|
|
iov[0].iov_base = (char *)req;
|
|
/* 4 for rfc1002 length field and 1 for pad */
|
|
iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
|
|
if (phase == NtLmNegotiate) {
|
|
ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
|
|
GFP_KERNEL);
|
|
if (ntlmssp_blob == NULL) {
|
|
rc = -ENOMEM;
|
|
goto ssetup_exit;
|
|
}
|
|
build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
|
|
if (use_spnego) {
|
|
/* blob_length = build_spnego_ntlmssp_blob(
|
|
&security_blob,
|
|
sizeof(struct _NEGOTIATE_MESSAGE),
|
|
ntlmssp_blob); */
|
|
/* BB eventually need to add this */
|
|
cERROR(1, "spnego not supported for SMB2 yet");
|
|
rc = -EOPNOTSUPP;
|
|
kfree(ntlmssp_blob);
|
|
goto ssetup_exit;
|
|
} else {
|
|
blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
|
|
/* with raw NTLMSSP we don't encapsulate in SPNEGO */
|
|
security_blob = ntlmssp_blob;
|
|
}
|
|
} else if (phase == NtLmAuthenticate) {
|
|
req->hdr.SessionId = ses->Suid;
|
|
ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
|
|
GFP_KERNEL);
|
|
if (ntlmssp_blob == NULL) {
|
|
cERROR(1, "failed to malloc ntlmssp blob");
|
|
rc = -ENOMEM;
|
|
goto ssetup_exit;
|
|
}
|
|
rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
|
|
nls_cp);
|
|
if (rc) {
|
|
cFYI(1, "build_ntlmssp_auth_blob failed %d", rc);
|
|
goto ssetup_exit; /* BB double check error handling */
|
|
}
|
|
if (use_spnego) {
|
|
/* blob_length = build_spnego_ntlmssp_blob(
|
|
&security_blob,
|
|
blob_length,
|
|
ntlmssp_blob); */
|
|
cERROR(1, "spnego not supported for SMB2 yet");
|
|
rc = -EOPNOTSUPP;
|
|
kfree(ntlmssp_blob);
|
|
goto ssetup_exit;
|
|
} else {
|
|
security_blob = ntlmssp_blob;
|
|
}
|
|
} else {
|
|
cERROR(1, "illegal ntlmssp phase");
|
|
rc = -EIO;
|
|
goto ssetup_exit;
|
|
}
|
|
|
|
/* Testing shows that buffer offset must be at location of Buffer[0] */
|
|
req->SecurityBufferOffset =
|
|
cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
|
|
1 /* pad */ - 4 /* rfc1001 len */);
|
|
req->SecurityBufferLength = cpu_to_le16(blob_length);
|
|
iov[1].iov_base = security_blob;
|
|
iov[1].iov_len = blob_length;
|
|
|
|
inc_rfc1001_len(req, blob_length - 1 /* pad */);
|
|
|
|
/* BB add code to build os and lm fields */
|
|
|
|
rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, CIFS_LOG_ERROR);
|
|
|
|
kfree(security_blob);
|
|
rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
|
|
if (rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
|
|
if (phase != NtLmNegotiate) {
|
|
cERROR(1, "Unexpected more processing error");
|
|
goto ssetup_exit;
|
|
}
|
|
if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
|
|
le16_to_cpu(rsp->SecurityBufferOffset)) {
|
|
cERROR(1, "Invalid security buffer offset %d",
|
|
le16_to_cpu(rsp->SecurityBufferOffset));
|
|
rc = -EIO;
|
|
goto ssetup_exit;
|
|
}
|
|
|
|
/* NTLMSSP Negotiate sent now processing challenge (response) */
|
|
phase = NtLmChallenge; /* process ntlmssp challenge */
|
|
rc = 0; /* MORE_PROCESSING is not an error here but expected */
|
|
ses->Suid = rsp->hdr.SessionId;
|
|
rc = decode_ntlmssp_challenge(rsp->Buffer,
|
|
le16_to_cpu(rsp->SecurityBufferLength), ses);
|
|
}
|
|
|
|
/*
|
|
* BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
|
|
* but at least the raw NTLMSSP case works.
|
|
*/
|
|
/*
|
|
* No tcon so can't do
|
|
* cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
|
|
*/
|
|
if (rc != 0)
|
|
goto ssetup_exit;
|
|
|
|
if (rsp == NULL) {
|
|
rc = -EIO;
|
|
goto ssetup_exit;
|
|
}
|
|
|
|
ses->session_flags = le16_to_cpu(rsp->SessionFlags);
|
|
ssetup_exit:
|
|
free_rsp_buf(resp_buftype, rsp);
|
|
|
|
/* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
|
|
if ((phase == NtLmChallenge) && (rc == 0))
|
|
goto ssetup_ntlmssp_authenticate;
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
|
|
{
|
|
struct smb2_logoff_req *req; /* response is also trivial struct */
|
|
int rc = 0;
|
|
struct TCP_Server_Info *server;
|
|
|
|
cFYI(1, "disconnect session %p", ses);
|
|
|
|
if (ses && (ses->server))
|
|
server = ses->server;
|
|
else
|
|
return -EIO;
|
|
|
|
rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* since no tcon, smb2_init can not do this, so do here */
|
|
req->hdr.SessionId = ses->Suid;
|
|
|
|
rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
|
|
/*
|
|
* No tcon so can't do
|
|
* cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
|
|
*/
|
|
return rc;
|
|
}
|
|
|
|
static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
|
|
{
|
|
cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
|
|
}
|
|
|
|
#define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
|
|
|
|
int
|
|
SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
|
|
struct cifs_tcon *tcon, const struct nls_table *cp)
|
|
{
|
|
struct smb2_tree_connect_req *req;
|
|
struct smb2_tree_connect_rsp *rsp = NULL;
|
|
struct kvec iov[2];
|
|
int rc = 0;
|
|
int resp_buftype;
|
|
int unc_path_len;
|
|
struct TCP_Server_Info *server;
|
|
__le16 *unc_path = NULL;
|
|
|
|
cFYI(1, "TCON");
|
|
|
|
if ((ses->server) && tree)
|
|
server = ses->server;
|
|
else
|
|
return -EIO;
|
|
|
|
if (tcon && tcon->bad_network_name)
|
|
return -ENOENT;
|
|
|
|
unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
|
|
if (unc_path == NULL)
|
|
return -ENOMEM;
|
|
|
|
unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
|
|
unc_path_len *= 2;
|
|
if (unc_path_len < 2) {
|
|
kfree(unc_path);
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
|
|
if (rc) {
|
|
kfree(unc_path);
|
|
return rc;
|
|
}
|
|
|
|
if (tcon == NULL) {
|
|
/* since no tcon, smb2_init can not do this, so do here */
|
|
req->hdr.SessionId = ses->Suid;
|
|
/* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
|
|
req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
|
|
}
|
|
|
|
iov[0].iov_base = (char *)req;
|
|
/* 4 for rfc1002 length field and 1 for pad */
|
|
iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
|
|
|
|
/* Testing shows that buffer offset must be at location of Buffer[0] */
|
|
req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
|
|
- 1 /* pad */ - 4 /* do not count rfc1001 len field */);
|
|
req->PathLength = cpu_to_le16(unc_path_len - 2);
|
|
iov[1].iov_base = unc_path;
|
|
iov[1].iov_len = unc_path_len;
|
|
|
|
inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
|
|
|
|
rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
|
|
rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
|
|
|
|
if (rc != 0) {
|
|
if (tcon) {
|
|
cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
|
|
tcon->need_reconnect = true;
|
|
}
|
|
goto tcon_error_exit;
|
|
}
|
|
|
|
if (rsp == NULL) {
|
|
rc = -EIO;
|
|
goto tcon_exit;
|
|
}
|
|
|
|
if (tcon == NULL) {
|
|
ses->ipc_tid = rsp->hdr.TreeId;
|
|
goto tcon_exit;
|
|
}
|
|
|
|
if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
|
|
cFYI(1, "connection to disk share");
|
|
else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
|
|
tcon->ipc = true;
|
|
cFYI(1, "connection to pipe share");
|
|
} else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
|
|
tcon->print = true;
|
|
cFYI(1, "connection to printer");
|
|
} else {
|
|
cERROR(1, "unknown share type %d", rsp->ShareType);
|
|
rc = -EOPNOTSUPP;
|
|
goto tcon_error_exit;
|
|
}
|
|
|
|
tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
|
|
tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
|
|
tcon->tidStatus = CifsGood;
|
|
tcon->need_reconnect = false;
|
|
tcon->tid = rsp->hdr.TreeId;
|
|
strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
|
|
|
|
if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
|
|
((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
|
|
cERROR(1, "DFS capability contradicts DFS flag");
|
|
|
|
tcon_exit:
|
|
free_rsp_buf(resp_buftype, rsp);
|
|
kfree(unc_path);
|
|
return rc;
|
|
|
|
tcon_error_exit:
|
|
if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
|
|
cERROR(1, "BAD_NETWORK_NAME: %s", tree);
|
|
tcon->bad_network_name = true;
|
|
}
|
|
goto tcon_exit;
|
|
}
|
|
|
|
int
|
|
SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
|
|
{
|
|
struct smb2_tree_disconnect_req *req; /* response is trivial */
|
|
int rc = 0;
|
|
struct TCP_Server_Info *server;
|
|
struct cifs_ses *ses = tcon->ses;
|
|
|
|
cFYI(1, "Tree Disconnect");
|
|
|
|
if (ses && (ses->server))
|
|
server = ses->server;
|
|
else
|
|
return -EIO;
|
|
|
|
if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
|
|
return 0;
|
|
|
|
rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
|
|
if (rc)
|
|
cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
|
|
u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
|
|
__u32 create_disposition, __u32 file_attributes, __u32 create_options)
|
|
{
|
|
struct smb2_create_req *req;
|
|
struct smb2_create_rsp *rsp;
|
|
struct TCP_Server_Info *server;
|
|
struct cifs_ses *ses = tcon->ses;
|
|
struct kvec iov[2];
|
|
int resp_buftype;
|
|
int uni_path_len;
|
|
int rc = 0;
|
|
int num_iovecs = 2;
|
|
|
|
cFYI(1, "create/open");
|
|
|
|
if (ses && (ses->server))
|
|
server = ses->server;
|
|
else
|
|
return -EIO;
|
|
|
|
rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (enable_oplocks)
|
|
req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_BATCH;
|
|
else
|
|
req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
|
|
req->ImpersonationLevel = IL_IMPERSONATION;
|
|
req->DesiredAccess = cpu_to_le32(desired_access);
|
|
/* File attributes ignored on open (used in create though) */
|
|
req->FileAttributes = cpu_to_le32(file_attributes);
|
|
req->ShareAccess = FILE_SHARE_ALL_LE;
|
|
req->CreateDisposition = cpu_to_le32(create_disposition);
|
|
req->CreateOptions = cpu_to_le32(create_options);
|
|
uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
|
|
req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
|
|
- 1 /* pad */ - 4 /* do not count rfc1001 len field */);
|
|
|
|
iov[0].iov_base = (char *)req;
|
|
/* 4 for rfc1002 length field */
|
|
iov[0].iov_len = get_rfc1002_length(req) + 4;
|
|
|
|
/* MUST set path len (NameLength) to 0 opening root of share */
|
|
if (uni_path_len >= 4) {
|
|
req->NameLength = cpu_to_le16(uni_path_len - 2);
|
|
/* -1 since last byte is buf[0] which is sent below (path) */
|
|
iov[0].iov_len--;
|
|
iov[1].iov_len = uni_path_len;
|
|
iov[1].iov_base = path;
|
|
/*
|
|
* -1 since last byte is buf[0] which was counted in
|
|
* smb2_buf_len.
|
|
*/
|
|
inc_rfc1001_len(req, uni_path_len - 1);
|
|
} else {
|
|
num_iovecs = 1;
|
|
req->NameLength = 0;
|
|
}
|
|
|
|
rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
|
|
rsp = (struct smb2_create_rsp *)iov[0].iov_base;
|
|
|
|
if (rc != 0) {
|
|
cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
|
|
goto creat_exit;
|
|
}
|
|
|
|
if (rsp == NULL) {
|
|
rc = -EIO;
|
|
goto creat_exit;
|
|
}
|
|
*persistent_fid = rsp->PersistentFileId;
|
|
*volatile_fid = rsp->VolatileFileId;
|
|
creat_exit:
|
|
free_rsp_buf(resp_buftype, rsp);
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
|
|
u64 persistent_fid, u64 volatile_fid)
|
|
{
|
|
struct smb2_close_req *req;
|
|
struct smb2_close_rsp *rsp;
|
|
struct TCP_Server_Info *server;
|
|
struct cifs_ses *ses = tcon->ses;
|
|
struct kvec iov[1];
|
|
int resp_buftype;
|
|
int rc = 0;
|
|
|
|
cFYI(1, "Close");
|
|
|
|
if (ses && (ses->server))
|
|
server = ses->server;
|
|
else
|
|
return -EIO;
|
|
|
|
rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
|
|
if (rc)
|
|
return rc;
|
|
|
|
req->PersistentFileId = persistent_fid;
|
|
req->VolatileFileId = volatile_fid;
|
|
|
|
iov[0].iov_base = (char *)req;
|
|
/* 4 for rfc1002 length field */
|
|
iov[0].iov_len = get_rfc1002_length(req) + 4;
|
|
|
|
rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
|
|
rsp = (struct smb2_close_rsp *)iov[0].iov_base;
|
|
|
|
if (rc != 0) {
|
|
if (tcon)
|
|
cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
|
|
goto close_exit;
|
|
}
|
|
|
|
if (rsp == NULL) {
|
|
rc = -EIO;
|
|
goto close_exit;
|
|
}
|
|
|
|
/* BB FIXME - decode close response, update inode for caching */
|
|
|
|
close_exit:
|
|
free_rsp_buf(resp_buftype, rsp);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
validate_buf(unsigned int offset, unsigned int buffer_length,
|
|
struct smb2_hdr *hdr, unsigned int min_buf_size)
|
|
|
|
{
|
|
unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
|
|
char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
|
|
char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
|
|
char *end_of_buf = begin_of_buf + buffer_length;
|
|
|
|
|
|
if (buffer_length < min_buf_size) {
|
|
cERROR(1, "buffer length %d smaller than minimum size %d",
|
|
buffer_length, min_buf_size);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* check if beyond RFC1001 maximum length */
|
|
if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
|
|
cERROR(1, "buffer length %d or smb length %d too large",
|
|
buffer_length, smb_len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
|
|
cERROR(1, "illegal server response, bad offset to data");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If SMB buffer fields are valid, copy into temporary buffer to hold result.
|
|
* Caller must free buffer.
|
|
*/
|
|
static int
|
|
validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
|
|
struct smb2_hdr *hdr, unsigned int minbufsize,
|
|
char *data)
|
|
|
|
{
|
|
char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
|
|
int rc;
|
|
|
|
if (!data)
|
|
return -EINVAL;
|
|
|
|
rc = validate_buf(offset, buffer_length, hdr, minbufsize);
|
|
if (rc)
|
|
return rc;
|
|
|
|
memcpy(data, begin_of_buf, buffer_length);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
|
|
u64 persistent_fid, u64 volatile_fid,
|
|
struct smb2_file_all_info *data)
|
|
{
|
|
struct smb2_query_info_req *req;
|
|
struct smb2_query_info_rsp *rsp = NULL;
|
|
struct kvec iov[2];
|
|
int rc = 0;
|
|
int resp_buftype;
|
|
struct TCP_Server_Info *server;
|
|
struct cifs_ses *ses = tcon->ses;
|
|
|
|
cFYI(1, "Query Info");
|
|
|
|
if (ses && (ses->server))
|
|
server = ses->server;
|
|
else
|
|
return -EIO;
|
|
|
|
rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
|
|
if (rc)
|
|
return rc;
|
|
|
|
req->InfoType = SMB2_O_INFO_FILE;
|
|
req->FileInfoClass = FILE_ALL_INFORMATION;
|
|
req->PersistentFileId = persistent_fid;
|
|
req->VolatileFileId = volatile_fid;
|
|
/* 4 for rfc1002 length field and 1 for Buffer */
|
|
req->InputBufferOffset =
|
|
cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
|
|
req->OutputBufferLength =
|
|
cpu_to_le32(sizeof(struct smb2_file_all_info) + MAX_NAME * 2);
|
|
|
|
iov[0].iov_base = (char *)req;
|
|
/* 4 for rfc1002 length field */
|
|
iov[0].iov_len = get_rfc1002_length(req) + 4;
|
|
|
|
rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
|
|
if (rc) {
|
|
cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
|
|
goto qinf_exit;
|
|
}
|
|
|
|
rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
|
|
|
|
rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
|
|
le32_to_cpu(rsp->OutputBufferLength),
|
|
&rsp->hdr, sizeof(struct smb2_file_all_info),
|
|
(char *)data);
|
|
|
|
qinf_exit:
|
|
free_rsp_buf(resp_buftype, rsp);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* This is a no-op for now. We're not really interested in the reply, but
|
|
* rather in the fact that the server sent one and that server->lstrp
|
|
* gets updated.
|
|
*
|
|
* FIXME: maybe we should consider checking that the reply matches request?
|
|
*/
|
|
static void
|
|
smb2_echo_callback(struct mid_q_entry *mid)
|
|
{
|
|
struct TCP_Server_Info *server = mid->callback_data;
|
|
struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
|
|
unsigned int credits_received = 1;
|
|
|
|
if (mid->mid_state == MID_RESPONSE_RECEIVED)
|
|
credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
|
|
|
|
DeleteMidQEntry(mid);
|
|
add_credits(server, credits_received, CIFS_ECHO_OP);
|
|
}
|
|
|
|
int
|
|
SMB2_echo(struct TCP_Server_Info *server)
|
|
{
|
|
struct smb2_echo_req *req;
|
|
int rc = 0;
|
|
struct kvec iov;
|
|
|
|
cFYI(1, "In echo request");
|
|
|
|
rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
|
|
if (rc)
|
|
return rc;
|
|
|
|
req->hdr.CreditRequest = cpu_to_le16(1);
|
|
|
|
iov.iov_base = (char *)req;
|
|
/* 4 for rfc1002 length field */
|
|
iov.iov_len = get_rfc1002_length(req) + 4;
|
|
|
|
rc = cifs_call_async(server, &iov, 1, NULL, smb2_echo_callback, server,
|
|
CIFS_ECHO_OP);
|
|
if (rc)
|
|
cFYI(1, "Echo request failed: %d", rc);
|
|
|
|
cifs_small_buf_release(req);
|
|
return rc;
|
|
}
|