mirror of https://gitee.com/openkylin/linux.git
CIFS: Add capability to send SMB2 negotiate message
and add negotiate request type to let set_credits know that we are only on negotiate stage and no need to make a decision about disabling echos and oplocks. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Pavel Shilovsky
Pavel Shilovsky
parent
3792c17328
commit
ec2e4523fd
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@ -16,4 +16,5 @@ cifs-$(CONFIG_CIFS_DFS_UPCALL) += dns_resolve.o cifs_dfs_ref.o
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cifs-$(CONFIG_CIFS_FSCACHE) += fscache.o cache.o
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cifs-$(CONFIG_CIFS_SMB2) += smb2ops.o smb2maperror.o smb2transport.o smb2misc.o
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cifs-$(CONFIG_CIFS_SMB2) += smb2ops.o smb2maperror.o smb2transport.o \
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smb2misc.o smb2pdu.o
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@ -313,6 +313,12 @@ get_rfc1002_length(void *buf)
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return be32_to_cpu(*((__be32 *)buf));
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}
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static inline void
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inc_rfc1001_len(void *buf, int count)
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{
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be32_add_cpu((__be32 *)buf, count);
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}
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struct TCP_Server_Info {
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struct list_head tcp_ses_list;
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struct list_head smb_ses_list;
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@ -393,6 +399,10 @@ struct TCP_Server_Info {
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atomic_t in_send; /* requests trying to send */
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atomic_t num_waiters; /* blocked waiting to get in sendrecv */
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#endif
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#ifdef CONFIG_CIFS_SMB2
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unsigned int max_read;
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unsigned int max_write;
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#endif /* CONFIG_CIFS_SMB2 */
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};
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static inline unsigned int
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@ -986,7 +996,8 @@ static inline void free_dfs_info_array(struct dfs_info3_param *param,
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/* Type of request operation */
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#define CIFS_ECHO_OP 0x080 /* echo request */
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#define CIFS_OBREAK_OP 0x0100 /* oplock break request */
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#define CIFS_OP_MASK 0x0180 /* mask request type */
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#define CIFS_NEG_OP 0x0200 /* negotiate request */
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#define CIFS_OP_MASK 0x0380 /* mask request type */
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/* Security Flags: indicate type of session setup needed */
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#define CIFSSEC_MAY_SIGN 0x00001
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@ -388,13 +388,6 @@ static int validate_t2(struct smb_t2_rsp *pSMB)
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return -EINVAL;
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}
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static inline void inc_rfc1001_len(void *pSMB, int count)
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{
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struct smb_hdr *hdr = (struct smb_hdr *)pSMB;
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be32_add_cpu(&hdr->smb_buf_length, count);
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}
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int
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CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
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{
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@ -199,7 +199,7 @@ static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
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* Returns the pointer to the beginning of the data area. Length of the data
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* area and the offset to it (from the beginning of the smb are also returned.
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*/
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static char *
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char *
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smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
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{
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*off = 0;
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@ -218,6 +218,11 @@ smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
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*/
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switch (hdr->Command) {
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case SMB2_NEGOTIATE:
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*off = le16_to_cpu(
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((struct smb2_negotiate_rsp *)hdr)->SecurityBufferOffset);
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*len = le16_to_cpu(
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((struct smb2_negotiate_rsp *)hdr)->SecurityBufferLength);
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break;
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case SMB2_SESSION_SETUP:
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case SMB2_CREATE:
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case SMB2_READ:
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@ -61,7 +61,7 @@ smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
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val = server->ops->get_credits_field(server, optype);
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*val += add;
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server->in_flight--;
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if (server->in_flight == 0)
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if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
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rc = change_conf(server);
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spin_unlock(&server->req_lock);
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wake_up(&server->request_q);
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@ -139,6 +139,24 @@ smb2_dump_detail(void *buf)
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#endif
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}
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static bool
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smb2_need_neg(struct TCP_Server_Info *server)
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{
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return server->max_read == 0;
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}
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static int
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smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
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{
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int rc;
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ses->server->CurrentMid = 0;
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rc = SMB2_negotiate(xid, ses);
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/* BB we probably don't need to retry with modern servers */
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if (rc == -EAGAIN)
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rc = -EHOSTDOWN;
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return rc;
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}
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struct smb_version_operations smb21_operations = {
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.setup_request = smb2_setup_request,
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.check_receive = smb2_check_receive,
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@ -150,6 +168,8 @@ struct smb_version_operations smb21_operations = {
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.find_mid = smb2_find_mid,
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.check_message = smb2_check_message,
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.dump_detail = smb2_dump_detail,
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.need_neg = smb2_need_neg,
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.negotiate = smb2_negotiate,
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};
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struct smb_version_values smb21_values = {
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@ -0,0 +1,330 @@
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/*
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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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/* BB add missing code here */
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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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/*
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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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*/
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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);
|
||||
/* BB Do we need to validate the SecurityMode? */
|
||||
server->sec_mode = le16_to_cpu(rsp->SecurityMode);
|
||||
server->capabilities = le32_to_cpu(rsp->Capabilities);
|
||||
|
||||
security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
|
||||
&rsp->hdr);
|
||||
if (blob_length == 0) {
|
||||
cERROR(1, "missing security blob on negprot");
|
||||
rc = -EIO;
|
||||
goto neg_exit;
|
||||
}
|
||||
#ifdef CONFIG_SMB2_ASN1 /* BB REMOVEME when updated asn1.c ready */
|
||||
rc = decode_neg_token_init(security_blob, blob_length,
|
||||
&server->sec_type);
|
||||
if (rc == 1)
|
||||
rc = 0;
|
||||
else if (rc == 0) {
|
||||
rc = -EIO;
|
||||
goto neg_exit;
|
||||
}
|
||||
#endif
|
||||
|
||||
neg_exit:
|
||||
free_rsp_buf(resp_buftype, rsp);
|
||||
return rc;
|
||||
}
|
||||
|
|
@ -148,4 +148,43 @@ struct smb2_err_rsp {
|
|||
__u8 ErrorData[1]; /* variable length */
|
||||
} __packed;
|
||||
|
||||
struct smb2_negotiate_req {
|
||||
struct smb2_hdr hdr;
|
||||
__le16 StructureSize; /* Must be 36 */
|
||||
__le16 DialectCount;
|
||||
__le16 SecurityMode;
|
||||
__le16 Reserved; /* MBZ */
|
||||
__le32 Capabilities;
|
||||
__u8 ClientGUID[16]; /* MBZ */
|
||||
__le64 ClientStartTime; /* MBZ */
|
||||
__le16 Dialects[2]; /* variable length */
|
||||
} __packed;
|
||||
|
||||
/* SecurityMode flags */
|
||||
#define SMB2_NEGOTIATE_SIGNING_ENABLED 0x0001
|
||||
#define SMB2_NEGOTIATE_SIGNING_REQUIRED 0x0002
|
||||
/* Capabilities flags */
|
||||
#define SMB2_GLOBAL_CAP_DFS 0x00000001
|
||||
#define SMB2_GLOBAL_CAP_LEASING 0x00000002 /* Resp only New to SMB2.1 */
|
||||
#define SMB2_GLOBAL_CAP_LARGE_MTU 0X00000004 /* Resp only New to SMB2.1 */
|
||||
|
||||
struct smb2_negotiate_rsp {
|
||||
struct smb2_hdr hdr;
|
||||
__le16 StructureSize; /* Must be 65 */
|
||||
__le16 SecurityMode;
|
||||
__le16 DialectRevision;
|
||||
__le16 Reserved; /* MBZ */
|
||||
__u8 ServerGUID[16];
|
||||
__le32 Capabilities;
|
||||
__le32 MaxTransactSize;
|
||||
__le32 MaxReadSize;
|
||||
__le32 MaxWriteSize;
|
||||
__le64 SystemTime; /* MBZ */
|
||||
__le64 ServerStartTime;
|
||||
__le16 SecurityBufferOffset;
|
||||
__le16 SecurityBufferLength;
|
||||
__le32 Reserved2; /* may be any value, ignore */
|
||||
__u8 Buffer[1]; /* variable length GSS security buffer */
|
||||
} __packed;
|
||||
|
||||
#endif /* _SMB2PDU_H */
|
||||
|
|
|
|||
|
|
@ -35,10 +35,17 @@ struct statfs;
|
|||
extern int map_smb2_to_linux_error(char *buf, bool log_err);
|
||||
extern int smb2_check_message(char *buf, unsigned int length);
|
||||
extern unsigned int smb2_calc_size(struct smb2_hdr *hdr);
|
||||
extern char *smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr);
|
||||
|
||||
extern int smb2_check_receive(struct mid_q_entry *mid,
|
||||
struct TCP_Server_Info *server, bool log_error);
|
||||
extern int smb2_setup_request(struct cifs_ses *ses, struct kvec *iov,
|
||||
unsigned int nvec, struct mid_q_entry **ret_mid);
|
||||
|
||||
/*
|
||||
* SMB2 Worker functions - most of protocol specific implementation details
|
||||
* are contained within these calls.
|
||||
*/
|
||||
extern int SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses);
|
||||
|
||||
#endif /* _SMB2PROTO_H */
|
||||
|
|
|
|||
Loading…
Reference in New Issue