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linux/linux/kernel/git/dhowells/linux-fs/refs/heads/afs-experimental/./fs/smb/client/smb2pdu.c
blob: 971b075e2e7dd71dce43e25c0c975af67bc23325 [file] [edit]
// SPDX-License-Identifier: LGPL-2.1
/*
*
* Copyright (C) International Business Machines Corp., 2009, 2013
* Etersoft, 2012
* Author(s): Steve French (sfrench@us.ibm.com)
* Pavel Shilovsky (pshilovsky@samba.org) 2012
*
* Contains the routines for constructing the SMB2 PDUs themselves
*
*/
/* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
/* Note that there are handle based routines which must be */
/* treated slightly differently for reconnection purposes since we never */
/* want to reuse a stale file handle and only the caller knows the file info */
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/vfs.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/uaccess.h>
#include <linux/uuid.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include <linux/netfs.h>
#include <trace/events/netfs.h>
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifsacl.h"
#include "smb2proto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "ntlmssp.h"
#include "../common/smbfsctl.h"
#include "../common/smb2status.h"
#include "smb2glob.h"
#include "cifs_spnego.h"
#include "smbdirect.h"
#include "trace.h"
#ifdef CONFIG_CIFS_DFS_UPCALL
#include "dfs_cache.h"
#endif
#include "cached_dir.h"
#include "compress.h"
#include "fs_context.h"
/*
* The following table defines the expected "StructureSize" of SMB2 requests
* in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
*
* Note that commands are defined in smb2pdu.h in le16 but the array below is
* indexed by command in host byte order.
*/
static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
/* SMB2_NEGOTIATE */ 36,
/* SMB2_SESSION_SETUP */ 25,
/* SMB2_LOGOFF */ 4,
/* SMB2_TREE_CONNECT */ 9,
/* SMB2_TREE_DISCONNECT */ 4,
/* SMB2_CREATE */ 57,
/* SMB2_CLOSE */ 24,
/* SMB2_FLUSH */ 24,
/* SMB2_READ */ 49,
/* SMB2_WRITE */ 49,
/* SMB2_LOCK */ 48,
/* SMB2_IOCTL */ 57,
/* SMB2_CANCEL */ 4,
/* SMB2_ECHO */ 4,
/* SMB2_QUERY_DIRECTORY */ 33,
/* SMB2_CHANGE_NOTIFY */ 32,
/* SMB2_QUERY_INFO */ 41,
/* SMB2_SET_INFO */ 33,
/* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
};
int smb3_encryption_required(const struct cifs_tcon *tcon)
{
if (!tcon || !tcon->ses)
return 0;
if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
(tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
return 1;
if (tcon->seal &&
(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
return 1;
if (((global_secflags & CIFSSEC_MUST_SEAL) == CIFSSEC_MUST_SEAL) &&
(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
return 1;
return 0;
}
static void
smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd,
const struct cifs_tcon *tcon,
struct TCP_Server_Info *server)
{
struct smb3_hdr_req *smb3_hdr;
shdr->ProtocolId = SMB2_PROTO_NUMBER;
shdr->StructureSize = cpu_to_le16(64);
shdr->Command = smb2_cmd;
if (server) {
/* After reconnect SMB3 must set ChannelSequence on subsequent reqs */
if (server->dialect >= SMB30_PROT_ID) {
smb3_hdr = (struct smb3_hdr_req *)shdr;
/*
* if primary channel is not set yet, use default
* channel for chan sequence num
*/
if (SERVER_IS_CHAN(server))
smb3_hdr->ChannelSequence =
cpu_to_le16(server->primary_server->channel_sequence_num);
else
smb3_hdr->ChannelSequence =
cpu_to_le16(server->channel_sequence_num);
}
spin_lock(&server->req_lock);
/* Request up to 10 credits but don't go over the limit. */
if (server->credits >= server->max_credits)
shdr->CreditRequest = cpu_to_le16(0);
else
shdr->CreditRequest = cpu_to_le16(
min_t(int, server->max_credits -
server->credits, 10));
spin_unlock(&server->req_lock);
} else {
shdr->CreditRequest = cpu_to_le16(2);
}
shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid);
if (!tcon)
goto out;
/* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
/* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
shdr->CreditCharge = cpu_to_le16(1);
/* else CreditCharge MBZ */
shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid);
/* Uid is not converted */
if (tcon->ses)
shdr->SessionId = cpu_to_le64(tcon->ses->Suid);
/*
* If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
* to pass the path on the Open SMB prefixed by \\server\share.
* Not sure when we would need to do the augmented path (if ever) and
* setting this flag breaks the SMB2 open operation since it is
* illegal to send an empty path name (without \\server\share prefix)
* when the DFS flag is set in the SMB open header. We could
* consider setting the flag on all operations other than open
* but it is safer to net set it for now.
*/
/* if (tcon->share_flags & SHI1005_FLAGS_DFS)
shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
if (server && server->sign && !smb3_encryption_required(tcon))
shdr->Flags |= SMB2_FLAGS_SIGNED;
out:
return;
}
/* helper function for code reuse */
static int
cifs_chan_skip_or_disable(struct cifs_ses *ses,
struct TCP_Server_Info *server,
bool from_reconnect, bool disable_mchan)
{
struct TCP_Server_Info *pserver;
unsigned int chan_index;
if (SERVER_IS_CHAN(server)) {
cifs_dbg(VFS,
"server %s does not support multichannel anymore. Skip secondary channel\n",
ses->server->hostname);
spin_lock(&ses->chan_lock);
chan_index = cifs_ses_get_chan_index(ses, server);
if (chan_index == CIFS_INVAL_CHAN_INDEX) {
spin_unlock(&ses->chan_lock);
goto skip_terminate;
}
ses->chans[chan_index].server = NULL;
server->terminate = true;
spin_unlock(&ses->chan_lock);
/*
* the above reference of server by channel
* needs to be dropped without holding chan_lock
* as cifs_put_tcp_session takes a higher lock
* i.e. cifs_tcp_ses_lock
*/
cifs_put_tcp_session(server, from_reconnect);
cifs_signal_cifsd_for_reconnect(server, false);
/* mark primary server as needing reconnect */
pserver = server->primary_server;
cifs_signal_cifsd_for_reconnect(pserver, false);
skip_terminate:
return -EHOSTDOWN;
}
cifs_decrease_secondary_channels(ses, disable_mchan);
return 0;
}
/*
* smb3_update_ses_channels - Synchronize session channels with new configuration
* @ses: pointer to the CIFS session structure
* @server: pointer to the TCP server info structure
* @from_reconnect: indicates if called from reconnect context
* @disable_mchan: indicates if called from reconnect to disable multichannel
*
* Returns 0 on success or error code on failure.
*
* Outside of reconfigure, this function is called from cifs_mount() during mount
* and from reconnect scenarios to adjust channel count when the
* server's multichannel support changes.
*/
int smb3_update_ses_channels(struct cifs_ses *ses, struct TCP_Server_Info *server,
bool from_reconnect, bool disable_mchan)
{
int rc = 0;
/*
* Manage session channels based on current count vs max:
* - If disable requested, skip or disable the channel
* - If below max channels, attempt to add more
* - If above max channels, skip or disable excess channels
*/
if (disable_mchan)
rc = cifs_chan_skip_or_disable(ses, server, from_reconnect, disable_mchan);
else {
if (ses->chan_count < ses->chan_max)
rc = cifs_try_adding_channels(ses);
else if (ses->chan_count > ses->chan_max)
rc = cifs_chan_skip_or_disable(ses, server, from_reconnect, disable_mchan);
}
return rc;
}
static int
smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
struct TCP_Server_Info *server, bool from_reconnect)
{
struct cifs_ses *ses;
int xid;
int rc = 0;
/*
* SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
* check for tcp and smb session status done differently
* for those three - in the calling routine.
*/
if (tcon == NULL)
return 0;
if (smb2_command == SMB2_TREE_CONNECT)
return 0;
spin_lock(&tcon->tc_lock);
if (tcon->status == TID_EXITING) {
/*
* only tree disconnect allowed when disconnecting ...
*/
if (smb2_command != SMB2_TREE_DISCONNECT) {
spin_unlock(&tcon->tc_lock);
cifs_tcon_dbg(FYI, "can not send cmd %d while umounting\n",
smb2_command);
return -ENODEV;
}
}
spin_unlock(&tcon->tc_lock);
ses = tcon->ses;
if (!ses)
return smb_EIO(smb_eio_trace_null_pointers);
spin_lock(&ses->ses_lock);
if (ses->ses_status == SES_EXITING) {
spin_unlock(&ses->ses_lock);
return smb_EIO(smb_eio_trace_sess_exiting);
}
spin_unlock(&ses->ses_lock);
if (!ses->server || !server)
return smb_EIO(smb_eio_trace_null_pointers);
spin_lock(&server->srv_lock);
if (server->tcpStatus == CifsNeedReconnect) {
/*
* Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
* here since they are implicitly done when session drops.
*/
switch (smb2_command) {
/*
* BB Should we keep oplock break and add flush to exceptions?
*/
case SMB2_TREE_DISCONNECT:
case SMB2_CANCEL:
case SMB2_CLOSE:
case SMB2_OPLOCK_BREAK:
spin_unlock(&server->srv_lock);
return -EAGAIN;
}
}
/* if server is marked for termination, cifsd will cleanup */
if (server->terminate) {
spin_unlock(&server->srv_lock);
return -EHOSTDOWN;
}
spin_unlock(&server->srv_lock);
again:
rc = cifs_wait_for_server_reconnect(server, tcon->retry);
if (rc)
return rc;
spin_lock(&ses->chan_lock);
if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
spin_unlock(&ses->chan_lock);
return 0;
}
spin_unlock(&ses->chan_lock);
cifs_tcon_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d\n",
tcon->ses->chans_need_reconnect,
tcon->need_reconnect);
mutex_lock(&ses->session_mutex);
/*
* Handle the case where a concurrent thread failed to negotiate or
* killed a channel.
*/
spin_lock(&server->srv_lock);
switch (server->tcpStatus) {
case CifsExiting:
spin_unlock(&server->srv_lock);
mutex_unlock(&ses->session_mutex);
return -EHOSTDOWN;
case CifsNeedReconnect:
spin_unlock(&server->srv_lock);
mutex_unlock(&ses->session_mutex);
if (!tcon->retry)
return -EHOSTDOWN;
goto again;
default:
break;
}
spin_unlock(&server->srv_lock);
/*
* need to prevent multiple threads trying to simultaneously
* reconnect the same SMB session
*/
spin_lock(&ses->ses_lock);
spin_lock(&ses->chan_lock);
if (!cifs_chan_needs_reconnect(ses, server) &&
ses->ses_status == SES_GOOD) {
spin_unlock(&ses->chan_lock);
spin_unlock(&ses->ses_lock);
/* this means that we only need to tree connect */
if (tcon->need_reconnect)
goto skip_sess_setup;
mutex_unlock(&ses->session_mutex);
goto out;
}
spin_unlock(&ses->chan_lock);
spin_unlock(&ses->ses_lock);
rc = cifs_negotiate_protocol(0, ses, server);
if (rc) {
mutex_unlock(&ses->session_mutex);
if (!tcon->retry)
return -EHOSTDOWN;
goto again;
}
/*
* if server stopped supporting multichannel
* and the first channel reconnected, disable all the others.
*/
if (ses->chan_count > 1 &&
!(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
rc = smb3_update_ses_channels(ses, server,
from_reconnect, true /* disable_mchan */);
if (rc) {
mutex_unlock(&ses->session_mutex);
goto out;
}
}
rc = cifs_setup_session(0, ses, server, ses->local_nls);
if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
/*
* Try alternate password for next reconnect (key rotation
* could be enabled on the server e.g.) if an alternate
* password is available and the current password is expired,
* but do not swap on non pwd related errors like host down
*/
if (ses->password2)
swap(ses->password2, ses->password);
}
if (rc) {
mutex_unlock(&ses->session_mutex);
if (rc == -EACCES && !tcon->retry)
return -EHOSTDOWN;
goto out;
}
skip_sess_setup:
if (!tcon->need_reconnect) {
mutex_unlock(&ses->session_mutex);
goto out;
}
cifs_mark_open_files_invalid(tcon);
if (tcon->use_persistent)
tcon->need_reopen_files = true;
rc = cifs_tree_connect(0, tcon);
cifs_tcon_dbg(FYI, "reconnect tcon rc = %d\n", rc);
if (rc) {
/* If sess reconnected but tcon didn't, something strange ... */
mutex_unlock(&ses->session_mutex);
cifs_tcon_dbg(VFS, "reconnect tcon failed rc = %d\n", rc);
goto out;
}
spin_lock(&ses->ses_lock);
if (ses->flags & CIFS_SES_FLAG_SCALE_CHANNELS) {
spin_unlock(&ses->ses_lock);
mutex_unlock(&ses->session_mutex);
goto skip_add_channels;
}
ses->flags |= CIFS_SES_FLAG_SCALE_CHANNELS;
spin_unlock(&ses->ses_lock);
if (!rc &&
(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL) &&
server->ops->query_server_interfaces) {
/*
* query server network interfaces, in case they change.
* Also mark the session as pending this update while the query
* is in progress. This will be used to avoid calling
* smb2_reconnect recursively.
*/
ses->flags |= CIFS_SES_FLAGS_PENDING_QUERY_INTERFACES;
xid = get_xid();
rc = server->ops->query_server_interfaces(xid, tcon, false);
free_xid(xid);
ses->flags &= ~CIFS_SES_FLAGS_PENDING_QUERY_INTERFACES;
if (!tcon->ipc && !tcon->dummy)
queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
(SMB_INTERFACE_POLL_INTERVAL * HZ));
mutex_unlock(&ses->session_mutex);
if (rc == -EOPNOTSUPP && ses->chan_count > 1) {
/*
* some servers like Azure SMB server do not advertise
* that multichannel has been disabled with server
* capabilities, rather return STATUS_NOT_IMPLEMENTED.
* treat this as server not supporting multichannel
*/
rc = smb3_update_ses_channels(ses, server,
from_reconnect,
true /* disable_mchan */);
goto skip_add_channels;
} else if (rc)
cifs_tcon_dbg(FYI, "%s: failed to query server interfaces: %d\n",
__func__, rc);
if (ses->chan_max > ses->chan_count &&
ses->iface_count &&
!SERVER_IS_CHAN(server)) {
if (ses->chan_count == 1)
cifs_server_dbg(VFS, "supports multichannel now\n");
smb3_update_ses_channels(ses, server, from_reconnect,
false /* disable_mchan */);
}
} else {
mutex_unlock(&ses->session_mutex);
}
skip_add_channels:
spin_lock(&ses->ses_lock);
ses->flags &= ~CIFS_SES_FLAG_SCALE_CHANNELS;
spin_unlock(&ses->ses_lock);
if (smb2_command != SMB2_INTERNAL_CMD)
cifs_queue_server_reconn(server);
atomic_inc(&tconInfoReconnectCount);
out:
/*
* Check if handle based operation so we know whether we can continue
* or not without returning to caller to reset file handle.
*/
/*
* BB Is flush done by server on drop of tcp session? Should we special
* case it and skip above?
*/
switch (smb2_command) {
case SMB2_FLUSH:
case SMB2_READ:
case SMB2_WRITE:
case SMB2_LOCK:
case SMB2_QUERY_DIRECTORY:
case SMB2_CHANGE_NOTIFY:
case SMB2_QUERY_INFO:
case SMB2_SET_INFO:
case SMB2_IOCTL:
rc = -EAGAIN;
}
return rc;
}
static void
fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
struct TCP_Server_Info *server,
void *buf,
unsigned int *total_len)
{
struct smb2_pdu *spdu = buf;
/* lookup word count ie StructureSize from table */
__u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
/*
* smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
* largest operations (Create)
*/
memset(buf, 0, 256);
smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server);
spdu->StructureSize2 = cpu_to_le16(parmsize);
*total_len = parmsize + sizeof(struct smb2_hdr);
}
/*
* Allocate and return pointer to an SMB request hdr, and set basic
* SMB information in the SMB header. If the return code is zero, this
* function must have filled in request_buf pointer.
*/
static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
struct TCP_Server_Info *server,
void **request_buf, unsigned int *total_len)
{
/* BB eventually switch this to SMB2 specific small buf size */
switch (smb2_command) {
case SMB2_SET_INFO:
case SMB2_QUERY_INFO:
*request_buf = cifs_buf_get();
break;
default:
*request_buf = cifs_small_buf_get();
break;
}
if (*request_buf == NULL) {
/* BB should we add a retry in here if not a writepage? */
return -ENOMEM;
}
fill_small_buf(smb2_command, tcon, server,
(struct smb2_hdr *)(*request_buf),
total_len);
if (tcon != NULL) {
uint16_t com_code = le16_to_cpu(smb2_command);
cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
cifs_stats_inc(&tcon->num_smbs_sent);
}
return 0;
}
static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
struct TCP_Server_Info *server,
void **request_buf, unsigned int *total_len)
{
int rc;
rc = smb2_reconnect(smb2_command, tcon, server, false);
if (rc)
return rc;
return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
total_len);
}
static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
struct TCP_Server_Info *server,
void **request_buf, unsigned int *total_len)
{
/*
* Skip reconnect in one of the following cases:
* 1. For FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs
* 2. For FSCTL_QUERY_NETWORK_INTERFACE_INFO IOCTL when called from
* smb2_reconnect (indicated by CIFS_SES_FLAG_SCALE_CHANNELS ses flag)
*/
if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO ||
(opcode == FSCTL_QUERY_NETWORK_INTERFACE_INFO &&
(tcon->ses->flags & CIFS_SES_FLAGS_PENDING_QUERY_INTERFACES)))
return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
request_buf, total_len);
return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
request_buf, total_len);
}
/* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
static void
build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
{
pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
pneg_ctxt->DataLength = cpu_to_le16(38);
pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
}
static void
build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
{
pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
pneg_ctxt->DataLength =
cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
- sizeof(struct smb2_neg_context));
pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
}
static unsigned int
build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)
{
unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);
unsigned short num_algs = 1; /* number of signing algorithms sent */
pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
/*
* Context Data length must be rounded to multiple of 8 for some servers
*/
pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) -
sizeof(struct smb2_neg_context) +
(num_algs * sizeof(u16)), 8));
pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);
pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);
ctxt_len += sizeof(__le16) * num_algs;
ctxt_len = ALIGN(ctxt_len, 8);
return ctxt_len;
/* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */
}
static void
build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
{
pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
if (require_gcm_256) {
pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
pneg_ctxt->CipherCount = cpu_to_le16(1);
pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
} else if (enable_gcm_256) {
pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
pneg_ctxt->CipherCount = cpu_to_le16(3);
pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
} else {
pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
pneg_ctxt->CipherCount = cpu_to_le16(2);
pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
}
}
static unsigned int
build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
{
struct nls_table *cp = load_nls_default();
pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
/* copy up to max of first 100 bytes of server name to NetName field */
pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
/* context size is DataLength + minimal smb2_neg_context */
return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8);
}
static void
build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
{
pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
pneg_ctxt->Name[0] = 0x93;
pneg_ctxt->Name[1] = 0xAD;
pneg_ctxt->Name[2] = 0x25;
pneg_ctxt->Name[3] = 0x50;
pneg_ctxt->Name[4] = 0x9C;
pneg_ctxt->Name[5] = 0xB4;
pneg_ctxt->Name[6] = 0x11;
pneg_ctxt->Name[7] = 0xE7;
pneg_ctxt->Name[8] = 0xB4;
pneg_ctxt->Name[9] = 0x23;
pneg_ctxt->Name[10] = 0x83;
pneg_ctxt->Name[11] = 0xDE;
pneg_ctxt->Name[12] = 0x96;
pneg_ctxt->Name[13] = 0x8B;
pneg_ctxt->Name[14] = 0xCD;
pneg_ctxt->Name[15] = 0x7C;
}
static void
assemble_neg_contexts(struct smb2_negotiate_req *req,
struct TCP_Server_Info *server, unsigned int *total_len)
{
unsigned int ctxt_len, neg_context_count;
struct TCP_Server_Info *pserver;
char *pneg_ctxt;
char *hostname;
if (*total_len > 200) {
/* In case length corrupted don't want to overrun smb buffer */
cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
return;
}
/*
* round up total_len of fixed part of SMB3 negotiate request to 8
* byte boundary before adding negotiate contexts
*/
*total_len = ALIGN(*total_len, 8);
pneg_ctxt = (*total_len) + (char *)req;
req->NegotiateContextOffset = cpu_to_le32(*total_len);
build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8);
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8);
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
/*
* secondary channels don't have the hostname field populated
* use the hostname field in the primary channel instead
*/
pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
cifs_server_lock(pserver);
hostname = pserver->hostname;
if (hostname && (hostname[0] != 0)) {
ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
hostname);
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
neg_context_count = 3;
} else
neg_context_count = 2;
cifs_server_unlock(pserver);
build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
*total_len += sizeof(struct smb2_posix_neg_context);
pneg_ctxt += sizeof(struct smb2_posix_neg_context);
neg_context_count++;
if (server->compression.requested) {
build_compression_ctxt((struct smb2_compression_capabilities_context *)
pneg_ctxt);
ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8);
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
neg_context_count++;
}
if (enable_negotiate_signing) {
ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)
pneg_ctxt);
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
neg_context_count++;
}
/* check for and add transport_capabilities and signing capabilities */
req->NegotiateContextCount = cpu_to_le16(neg_context_count);
}
/* If invalid preauth context warn but use what we requested, SHA-512 */
static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
{
unsigned int len = le16_to_cpu(ctxt->DataLength);
/*
* Caller checked that DataLength remains within SMB boundary. We still
* need to confirm that one HashAlgorithms member is accounted for.
*/
if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
pr_warn_once("server sent bad preauth context\n");
return;
} else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
pr_warn_once("server sent invalid SaltLength\n");
return;
}
if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
pr_warn_once("Invalid SMB3 hash algorithm count\n");
if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
pr_warn_once("unknown SMB3 hash algorithm\n");
}
static void decode_compress_ctx(struct TCP_Server_Info *server,
struct smb2_compression_capabilities_context *ctxt)
{
unsigned int len = le16_to_cpu(ctxt->DataLength);
__le16 alg;
server->compression.enabled = false;
/*
* Caller checked that DataLength remains within SMB boundary. We still
* need to confirm that one CompressionAlgorithms member is accounted
* for.
*/
if (len < 10) {
pr_warn_once("server sent bad compression cntxt\n");
return;
}
if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
pr_warn_once("invalid SMB3 compress algorithm count\n");
return;
}
alg = ctxt->CompressionAlgorithms[0];
/* 'NONE' (0) compressor type is never negotiated */
if (alg == 0 || le16_to_cpu(alg) > 3) {
pr_warn_once("invalid compression algorithm '%u'\n", alg);
return;
}
server->compression.alg = alg;
server->compression.enabled = true;
}
static int decode_encrypt_ctx(struct TCP_Server_Info *server,
struct smb2_encryption_neg_context *ctxt)
{
unsigned int len = le16_to_cpu(ctxt->DataLength);
cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
/*
* Caller checked that DataLength remains within SMB boundary. We still
* need to confirm that one Cipher flexible array member is accounted
* for.
*/
if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
pr_warn_once("server sent bad crypto ctxt len\n");
return -EINVAL;
}
if (le16_to_cpu(ctxt->CipherCount) != 1) {
pr_warn_once("Invalid SMB3.11 cipher count\n");
return -EINVAL;
}
cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
if (require_gcm_256) {
if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
return -EOPNOTSUPP;
}
} else if (ctxt->Ciphers[0] == 0) {
/*
* e.g. if server only supported AES256_CCM (very unlikely)
* or server supported no encryption types or had all disabled.
* Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
* in which mount requested encryption ("seal") checks later
* on during tree connection will return proper rc, but if
* seal not requested by client, since server is allowed to
* return 0 to indicate no supported cipher, we can't fail here
*/
server->cipher_type = 0;
server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
pr_warn_once("Server does not support requested encryption types\n");
return 0;
} else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
(ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
(ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
/* server returned a cipher we didn't ask for */
pr_warn_once("Invalid SMB3.11 cipher returned\n");
return -EINVAL;
}
server->cipher_type = ctxt->Ciphers[0];
server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
return 0;
}
static void decode_signing_ctx(struct TCP_Server_Info *server,
struct smb2_signing_capabilities *pctxt)
{
unsigned int len = le16_to_cpu(pctxt->DataLength);
/*
* Caller checked that DataLength remains within SMB boundary. We still
* need to confirm that one SigningAlgorithms flexible array member is
* accounted for.
*/
if ((len < 4) || (len > 16)) {
pr_warn_once("server sent bad signing negcontext\n");
return;
}
if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {
pr_warn_once("Invalid signing algorithm count\n");
return;
}
if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {
pr_warn_once("unknown signing algorithm\n");
return;
}
server->signing_negotiated = true;
server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);
cifs_dbg(FYI, "signing algorithm %d chosen\n",
server->signing_algorithm);
}
static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
struct TCP_Server_Info *server,
unsigned int len_of_smb)
{
struct smb2_neg_context *pctx;
unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
unsigned int len_of_ctxts, i;
int rc = 0;
cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
if (len_of_smb <= offset) {
cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
return -EINVAL;
}
len_of_ctxts = len_of_smb - offset;
for (i = 0; i < ctxt_cnt; i++) {
int clen;
/* check that offset is not beyond end of SMB */
if (len_of_ctxts < sizeof(struct smb2_neg_context))
break;
pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
clen = sizeof(struct smb2_neg_context)
+ le16_to_cpu(pctx->DataLength);
/*
* 2.2.4 SMB2 NEGOTIATE Response
* Subsequent negotiate contexts MUST appear at the first 8-byte
* aligned offset following the previous negotiate context.
*/
if (i + 1 != ctxt_cnt)
clen = ALIGN(clen, 8);
if (clen > len_of_ctxts)
break;
if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
decode_preauth_context(
(struct smb2_preauth_neg_context *)pctx);
else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
rc = decode_encrypt_ctx(server,
(struct smb2_encryption_neg_context *)pctx);
else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
decode_compress_ctx(server,
(struct smb2_compression_capabilities_context *)pctx);
else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
server->posix_ext_supported = true;
else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)
decode_signing_ctx(server,
(struct smb2_signing_capabilities *)pctx);
else
cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
le16_to_cpu(pctx->ContextType));
if (rc)
break;
offset += clen;
len_of_ctxts -= clen;
}
return rc;
}
static struct create_posix *
create_posix_buf(umode_t mode)
{
struct create_posix *buf;
buf = kzalloc_obj(struct create_posix);
if (!buf)
return NULL;
buf->ccontext.DataOffset =
cpu_to_le16(offsetof(struct create_posix, Mode));
buf->ccontext.DataLength = cpu_to_le32(4);
buf->ccontext.NameOffset =
cpu_to_le16(offsetof(struct create_posix, Name));
buf->ccontext.NameLength = cpu_to_le16(16);
/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
buf->Name[0] = 0x93;
buf->Name[1] = 0xAD;
buf->Name[2] = 0x25;
buf->Name[3] = 0x50;
buf->Name[4] = 0x9C;
buf->Name[5] = 0xB4;
buf->Name[6] = 0x11;
buf->Name[7] = 0xE7;
buf->Name[8] = 0xB4;
buf->Name[9] = 0x23;
buf->Name[10] = 0x83;
buf->Name[11] = 0xDE;
buf->Name[12] = 0x96;
buf->Name[13] = 0x8B;
buf->Name[14] = 0xCD;
buf->Name[15] = 0x7C;
buf->Mode = cpu_to_le32(mode);
cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
return buf;
}
static int
add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
{
unsigned int num = *num_iovec;
iov[num].iov_base = create_posix_buf(mode);
if (mode == ACL_NO_MODE)
cifs_dbg(FYI, "%s: no mode\n", __func__);
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = sizeof(struct create_posix);
*num_iovec = num + 1;
return 0;
}
/*
*
* SMB2 Worker functions follow:
*
* The general structure of the worker functions is:
* 1) Call smb2_init (assembles SMB2 header)
* 2) Initialize SMB2 command specific fields in fixed length area of SMB
* 3) Call smb_sendrcv2 (sends request on socket and waits for response)
* 4) Decode SMB2 command specific fields in the fixed length area
* 5) Decode variable length data area (if any for this SMB2 command type)
* 6) Call free smb buffer
* 7) return
*
*/
int
SMB2_negotiate(const unsigned int xid,
struct cifs_ses *ses,
struct TCP_Server_Info *server)
{
struct smb_rqst rqst;
struct smb2_negotiate_req *req;
struct smb2_negotiate_rsp *rsp;
struct kvec iov[1];
struct kvec rsp_iov;
int rc;
int resp_buftype;
int blob_offset, blob_length;
char *security_blob;
int flags = CIFS_NEG_OP;
unsigned int total_len;
cifs_dbg(FYI, "Negotiate protocol\n");
if (!server) {
WARN(1, "%s: server is NULL!\n", __func__);
return smb_EIO(smb_eio_trace_null_pointers);
}
rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
(void **) &req, &total_len);
if (rc)
return rc;
req->hdr.SessionId = 0;
memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
if (strcmp(server->vals->version_string,
SMB3ANY_VERSION_STRING) == 0) {
req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
req->DialectCount = cpu_to_le16(3);
total_len += 6;
} else if (strcmp(server->vals->version_string,
SMBDEFAULT_VERSION_STRING) == 0) {
req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
req->DialectCount = cpu_to_le16(4);
total_len += 8;
} else {
/* otherwise send specific dialect */
req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
req->DialectCount = cpu_to_le16(1);
total_len += 2;
}
/* only one of SMB2 signing flags may be set in SMB2 request */
if (ses->sign)
req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
else if (global_secflags & CIFSSEC_MAY_SIGN)
req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
else
req->SecurityMode = 0;
req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
/* ClientGUID must be zero for SMB2.02 dialect */
if (server->vals->protocol_id == SMB20_PROT_ID)
memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
else {
memcpy(req->ClientGUID, server->client_guid,
SMB2_CLIENT_GUID_SIZE);
if ((server->vals->protocol_id == SMB311_PROT_ID) ||
(strcmp(server->vals->version_string,
SMB3ANY_VERSION_STRING) == 0) ||
(strcmp(server->vals->version_string,
SMBDEFAULT_VERSION_STRING) == 0))
assemble_neg_contexts(req, server, &total_len);
}
iov[0].iov_base = (char *)req;
iov[0].iov_len = total_len;
memset(&rqst, 0, sizeof(struct smb_rqst));
rqst.rq_iov = iov;
rqst.rq_nvec = 1;
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
cifs_small_buf_release(req);
rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
/*
* No tcon so can't do
* cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
*/
if (rc == -EOPNOTSUPP) {
cifs_server_dbg(VFS, "Dialect not supported by server. Consider specifying vers=1.0 or vers=2.0 on mount for accessing older servers\n");
goto neg_exit;
} else if (rc != 0)
goto neg_exit;
u16 dialect = le16_to_cpu(rsp->DialectRevision);
if (strcmp(server->vals->version_string,
SMB3ANY_VERSION_STRING) == 0) {
switch (dialect) {
case SMB20_PROT_ID:
cifs_server_dbg(VFS,
"SMB2 dialect returned but not requested\n");
rc = smb_EIO2(smb_eio_trace_neg_unreq_dialect, dialect, 3);
goto neg_exit;
case SMB21_PROT_ID:
cifs_server_dbg(VFS,
"SMB2.1 dialect returned but not requested\n");
rc = smb_EIO2(smb_eio_trace_neg_unreq_dialect, dialect, 3);
goto neg_exit;
case SMB311_PROT_ID:
/* ops set to 3.0 by default for default so update */
server->ops = &smb311_operations;
server->vals = &smb311_values;
break;
default:
break;
}
} else if (strcmp(server->vals->version_string,
SMBDEFAULT_VERSION_STRING) == 0) {
switch (dialect) {
case SMB20_PROT_ID:
cifs_server_dbg(VFS,
"SMB2 dialect returned but not requested\n");
rc = smb_EIO2(smb_eio_trace_neg_unreq_dialect, dialect, 0);
goto neg_exit;
case SMB21_PROT_ID:
/* ops set to 3.0 by default for default so update */
server->ops = &smb21_operations;
server->vals = &smb21_values;
break;
case SMB311_PROT_ID:
server->ops = &smb311_operations;
server->vals = &smb311_values;
break;
default:
break;
}
} else if (dialect != server->vals->protocol_id) {
/* if requested single dialect ensure returned dialect matched */
cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
dialect);
rc = smb_EIO2(smb_eio_trace_neg_unreq_dialect,
dialect, server->vals->protocol_id);
goto neg_exit;
}
cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
switch (dialect) {
case SMB20_PROT_ID:
cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
break;
case SMB21_PROT_ID:
cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
break;
case SMB30_PROT_ID:
cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
break;
case SMB302_PROT_ID:
cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
break;
case SMB311_PROT_ID:
cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
break;
default:
cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
dialect);
rc = smb_EIO1(smb_eio_trace_neg_inval_dialect, dialect);
goto neg_exit;
}
rc = 0;
server->dialect = dialect;
/*
* Keep a copy of the hash after negprot. This hash will be
* the starting hash value for all sessions made from this
* server.
*/
memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
SMB2_PREAUTH_HASH_SIZE);
/* SMB2 only has an extended negflavor */
server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
/* set it to the maximum buffer size value we can send with 1 credit */
server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
SMB2_MAX_BUFFER_SIZE);
server->max_read = le32_to_cpu(rsp->MaxReadSize);
server->max_write = le32_to_cpu(rsp->MaxWriteSize);
server->sec_mode = le16_to_cpu(rsp->SecurityMode);
if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
server->sec_mode);
server->capabilities = le32_to_cpu(rsp->Capabilities);
/* Internal types */
server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
/*
* SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
* Set the cipher type manually.
*/
if ((server->dialect == SMB30_PROT_ID ||
server->dialect == SMB302_PROT_ID) &&
(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
(struct smb2_hdr *)rsp);
/*
* See MS-SMB2 section 2.2.4: if no blob, client picks default which
* for us will be
* ses->sectype = RawNTLMSSP;
* but for time being this is our only auth choice so doesn't matter.
* We just found a server which sets blob length to zero expecting raw.
*/
if (blob_length == 0) {
cifs_dbg(FYI, "missing security blob on negprot\n");
server->sec_ntlmssp = true;
}
rc = cifs_enable_signing(server, ses->sign);
if (rc)
goto neg_exit;
if (blob_length) {
rc = decode_negTokenInit(security_blob, blob_length, server);
if (rc == 1)
rc = 0;
else if (rc == 0)
rc = smb_EIO1(smb_eio_trace_neg_decode_token, rc);
}
if (server->dialect == SMB311_PROT_ID) {
if (rsp->NegotiateContextCount)
rc = smb311_decode_neg_context(rsp, server,
rsp_iov.iov_len);
else
cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
}
if (server->cipher_type && !rc)
rc = smb3_crypto_aead_allocate(server);
neg_exit:
free_rsp_buf(resp_buftype, rsp);
return rc;
}
int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
{
int rc;
struct validate_negotiate_info_req *pneg_inbuf;
struct validate_negotiate_info_rsp *pneg_rsp = NULL;
u32 rsplen;
u32 inbuflen; /* max of 4 dialects */
struct TCP_Server_Info *server = tcon->ses->server;
cifs_dbg(FYI, "validate negotiate\n");
/* In SMB3.11 preauth integrity supersedes validate negotiate */
if (server->dialect == SMB311_PROT_ID)
return 0;
/*
* validation ioctl must be signed, so no point sending this if we
* can not sign it (ie are not known user). Even if signing is not
* required (enabled but not negotiated), in those cases we selectively
* sign just this, the first and only signed request on a connection.
* Having validation of negotiate info helps reduce attack vectors.
*/
if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
return 0; /* validation requires signing */
if (tcon->ses->user_name == NULL) {
cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
return 0; /* validation requires signing */
}
if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
pneg_inbuf = kmalloc_obj(*pneg_inbuf, GFP_NOFS);
if (!pneg_inbuf)
return -ENOMEM;
pneg_inbuf->Capabilities =
cpu_to_le32(server->vals->req_capabilities);
pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
memcpy(pneg_inbuf->Guid, server->client_guid,
SMB2_CLIENT_GUID_SIZE);
if (tcon->ses->sign)
pneg_inbuf->SecurityMode =
cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
else if (global_secflags & CIFSSEC_MAY_SIGN)
pneg_inbuf->SecurityMode =
cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
else
pneg_inbuf->SecurityMode = 0;
if (strcmp(server->vals->version_string,
SMB3ANY_VERSION_STRING) == 0) {
pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
pneg_inbuf->DialectCount = cpu_to_le16(3);
/* SMB 2.1 not included so subtract one dialect from len */
inbuflen = sizeof(*pneg_inbuf) -
(sizeof(pneg_inbuf->Dialects[0]));
} else if (strcmp(server->vals->version_string,
SMBDEFAULT_VERSION_STRING) == 0) {
pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
pneg_inbuf->DialectCount = cpu_to_le16(4);
/* structure is big enough for 4 dialects */
inbuflen = sizeof(*pneg_inbuf);
} else {
/* otherwise specific dialect was requested */
pneg_inbuf->Dialects[0] =
cpu_to_le16(server->vals->protocol_id);
pneg_inbuf->DialectCount = cpu_to_le16(1);
/* structure is big enough for 4 dialects, sending only 1 */
inbuflen = sizeof(*pneg_inbuf) -
sizeof(pneg_inbuf->Dialects[0]) * 3;
}
rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
FSCTL_VALIDATE_NEGOTIATE_INFO,
(char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
(char **)&pneg_rsp, &rsplen);
if (rc == -EOPNOTSUPP) {
/*
* Old Windows versions or Netapp SMB server can return
* not supported error. Client should accept it.
*/
cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
rc = 0;
goto out_free_inbuf;
} else if (rc != 0) {
cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
rc);
rc = smb_EIO1(smb_eio_trace_neg_info_fail, rc);
goto out_free_inbuf;
}
if (rsplen != sizeof(*pneg_rsp)) {
cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
rsplen);
/* relax check since Mac returns max bufsize allowed on ioctl */
if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp)) {
rc = smb_EIO1(smb_eio_trace_neg_bad_rsplen, rsplen);
goto out_free_rsp;
}
}
/* check validate negotiate info response matches what we got earlier */
u16 dialect = le16_to_cpu(pneg_rsp->Dialect);
if (dialect != server->dialect) {
rc = smb_EIO2(smb_eio_trace_neg_info_dialect,
dialect, server->dialect);
goto vneg_out;
}
u16 sec_mode = le16_to_cpu(pneg_rsp->SecurityMode);
if (sec_mode != server->sec_mode) {
rc = smb_EIO2(smb_eio_trace_neg_info_sec_mode,
sec_mode, server->sec_mode);
goto vneg_out;
}
/* do not validate server guid because not saved at negprot time yet */
u32 caps = le32_to_cpu(pneg_rsp->Capabilities);
if ((caps | SMB2_NT_FIND |
SMB2_LARGE_FILES) != server->capabilities) {
rc = smb_EIO2(smb_eio_trace_neg_info_caps,
caps, server->capabilities);
goto vneg_out;
}
/* validate negotiate successful */
rc = 0;
cifs_dbg(FYI, "validate negotiate info successful\n");
goto out_free_rsp;
vneg_out:
cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
out_free_rsp:
kfree(pneg_rsp);
out_free_inbuf:
kfree(pneg_inbuf);
return rc;
}
enum securityEnum
smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
{
switch (requested) {
case Kerberos:
case RawNTLMSSP:
return requested;
case NTLMv2:
return RawNTLMSSP;
case Unspecified:
if (server->sec_ntlmssp &&
(global_secflags & CIFSSEC_MAY_NTLMSSP))
return RawNTLMSSP;
if ((server->sec_kerberos || server->sec_mskerberos || server->sec_iakerb) &&
(global_secflags & CIFSSEC_MAY_KRB5))
return Kerberos;
fallthrough;
default:
return Unspecified;
}
}
struct SMB2_sess_data {
unsigned int xid;
struct cifs_ses *ses;
struct TCP_Server_Info *server;
struct nls_table *nls_cp;
void (*func)(struct SMB2_sess_data *);
int result;
u64 previous_session;
/* we will send the SMB in three pieces:
* a fixed length beginning part, an optional
* SPNEGO blob (which can be zero length), and a
* last part which will include the strings
* and rest of bcc area. This allows us to avoid
* a large buffer 17K allocation
*/
int buf0_type;
struct kvec iov[2];
};
static int
SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
{
int rc;
struct cifs_ses *ses = sess_data->ses;
struct TCP_Server_Info *server = sess_data->server;
struct smb2_sess_setup_req *req;
unsigned int total_len;
bool is_binding = false;
rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
(void **) &req,
&total_len);
if (rc)
return rc;
spin_lock(&ses->ses_lock);
is_binding = (ses->ses_status == SES_GOOD);
spin_unlock(&ses->ses_lock);
if (is_binding) {
req->hdr.SessionId = cpu_to_le64(ses->Suid);
req->hdr.Flags |= SMB2_FLAGS_SIGNED;
req->PreviousSessionId = 0;
req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid);
} else {
/* First session, not a reauthenticate */
req->hdr.SessionId = 0;
/*
* if reconnect, we need to send previous sess id
* otherwise it is 0
*/
req->PreviousSessionId = cpu_to_le64(sess_data->previous_session);
req->Flags = 0; /* MBZ */
cifs_dbg(FYI, "Fresh session. Previous: %llx\n",
sess_data->previous_session);
}
/* enough to enable echos and oplocks and one max size write */
if (server->credits >= server->max_credits)
req->hdr.CreditRequest = cpu_to_le16(0);
else
req->hdr.CreditRequest = cpu_to_le16(
min_t(int, server->max_credits -
server->credits, 130));
/* only one of SMB2 signing flags may be set in SMB2 request */
if (server->sign)
req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
else
req->SecurityMode = 0;
#ifdef CONFIG_CIFS_DFS_UPCALL
req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
#else
req->Capabilities = 0;
#endif /* DFS_UPCALL */
req->Channel = 0; /* MBZ */
sess_data->iov[0].iov_base = (char *)req;
/* 1 for pad */
sess_data->iov[0].iov_len = total_len - 1;
/*
* This variable will be used to clear the buffer
* allocated above in case of any error in the calling function.
*/
sess_data->buf0_type = CIFS_SMALL_BUFFER;
return 0;
}
static void
SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
{
struct kvec *iov = sess_data->iov;
/* iov[1] is already freed by caller */
if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
memzero_explicit(iov[0].iov_base, iov[0].iov_len);
free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
sess_data->buf0_type = CIFS_NO_BUFFER;
}
static int
SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
{
int rc;
struct smb_rqst rqst;
struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
struct kvec rsp_iov = { NULL, 0 };
/* Testing shows that buffer offset must be at location of Buffer[0] */
req->SecurityBufferOffset =
cpu_to_le16(sizeof(struct smb2_sess_setup_req));
req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
memset(&rqst, 0, sizeof(struct smb_rqst));
rqst.rq_iov = sess_data->iov;
rqst.rq_nvec = 2;
/* BB add code to build os and lm fields */
rc = cifs_send_recv(sess_data->xid, sess_data->ses,
sess_data->server,
&rqst,
&sess_data->buf0_type,
CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
cifs_small_buf_release(sess_data->iov[0].iov_base);
if (rc == 0)
sess_data->ses->expired_pwd = false;
else if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
if (sess_data->ses->expired_pwd == false)
trace_smb3_key_expired(sess_data->server->hostname,
sess_data->ses->user_name,
sess_data->server->conn_id,
&sess_data->server->dstaddr, rc);
sess_data->ses->expired_pwd = true;
}
memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
return rc;
}
static int
SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
{
int rc = 0;
struct cifs_ses *ses = sess_data->ses;
struct TCP_Server_Info *server = sess_data->server;
cifs_server_lock(server);
if (server->ops->generate_signingkey) {
rc = server->ops->generate_signingkey(ses, server);
if (rc) {
cifs_dbg(FYI,
"SMB3 session key generation failed\n");
cifs_server_unlock(server);
return rc;
}
}
if (!server->session_estab) {
server->sequence_number = 0x2;
server->session_estab = true;
}
cifs_server_unlock(server);
cifs_dbg(FYI, "SMB2/3 session established successfully\n");
return rc;
}
#ifdef CONFIG_CIFS_UPCALL
static void
SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
{
int rc;
struct cifs_ses *ses = sess_data->ses;
struct TCP_Server_Info *server = sess_data->server;
struct cifs_spnego_msg *msg;
struct key *spnego_key = NULL;
struct smb2_sess_setup_rsp *rsp = NULL;
bool is_binding = false;
rc = SMB2_sess_alloc_buffer(sess_data);
if (rc)
goto out;
spnego_key = cifs_get_spnego_key(ses, server);
if (IS_ERR(spnego_key)) {
rc = PTR_ERR(spnego_key);
spnego_key = NULL;
goto out;
}
msg = spnego_key->payload.data[0];
/*
* check version field to make sure that cifs.upcall is
* sending us a response in an expected form
*/
if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
CIFS_SPNEGO_UPCALL_VERSION, msg->version);
rc = -EKEYREJECTED;
goto out_put_spnego_key;
}
spin_lock(&ses->ses_lock);
is_binding = (ses->ses_status == SES_GOOD);
spin_unlock(&ses->ses_lock);
/*
* Per MS-SMB2 3.2.5.3, Session.SessionKey is the first 16 bytes of the
* GSS cryptographic key, right-padded with zero bytes if shorter.
* Allocate at least SMB2_NTLMV2_SESSKEY_SIZE bytes (zeroed) so the KDF
* input buffer is always valid for HMAC-SHA256 even with deprecated
* Kerberos enctypes that return a short session key.
*/
if (unlikely(msg->sesskey_len < SMB2_NTLMV2_SESSKEY_SIZE))
cifs_dbg(VFS,
"short GSS session key (%u bytes); zero-padding per MS-SMB2 3.2.5.3\n",
msg->sesskey_len);
kfree_sensitive(ses->auth_key.response);
ses->auth_key.len = max_t(unsigned int, msg->sesskey_len,
SMB2_NTLMV2_SESSKEY_SIZE);
ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
if (!ses->auth_key.response) {
cifs_dbg(VFS, "%s: can't allocate (%u bytes) memory\n",
__func__, ses->auth_key.len);
ses->auth_key.len = 0;
rc = -ENOMEM;
goto out_put_spnego_key;
}
memcpy(ses->auth_key.response, msg->data, msg->sesskey_len);
sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
sess_data->iov[1].iov_len = msg->secblob_len;
rc = SMB2_sess_sendreceive(sess_data);
if (rc)
goto out_put_spnego_key;
rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
/* keep session id and flags if binding */
if (!is_binding) {
ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
ses->session_flags = le16_to_cpu(rsp->SessionFlags);
}
rc = SMB2_sess_establish_session(sess_data);
out_put_spnego_key:
key_invalidate(spnego_key);
key_put(spnego_key);
if (rc) {
kfree_sensitive(ses->auth_key.response);
ses->auth_key.response = NULL;
ses->auth_key.len = 0;
}
out:
sess_data->result = rc;
sess_data->func = NULL;
SMB2_sess_free_buffer(sess_data);
}
#else
static void
SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
{
cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
sess_data->result = -EOPNOTSUPP;
sess_data->func = NULL;
}
#endif
static void
SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
static void
SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
{
int rc;
struct cifs_ses *ses = sess_data->ses;
struct TCP_Server_Info *server = sess_data->server;
struct smb2_sess_setup_rsp *rsp = NULL;
unsigned char *ntlmssp_blob = NULL;
bool use_spnego = false; /* else use raw ntlmssp */
u16 blob_length = 0;
bool is_binding = false;
/*
* If memory allocation is successful, caller of this function
* frees it.
*/
ses->ntlmssp = kmalloc_obj(struct ntlmssp_auth);
if (!ses->ntlmssp) {
rc = -ENOMEM;
goto out_err;
}
ses->ntlmssp->sesskey_per_smbsess = true;
rc = SMB2_sess_alloc_buffer(sess_data);
if (rc)
goto out_err;
rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,
&blob_length, ses, server,
sess_data->nls_cp);
if (rc)
goto out;
if (use_spnego) {
/* BB eventually need to add this */
cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
rc = -EOPNOTSUPP;
goto out;
}
sess_data->iov[1].iov_base = ntlmssp_blob;
sess_data->iov[1].iov_len = blob_length;
rc = SMB2_sess_sendreceive(sess_data);
rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
/* If true, rc here is expected and not an error */
if (sess_data->buf0_type != CIFS_NO_BUFFER &&
rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
rc = 0;
if (rc)
goto out;
u16 boff = le16_to_cpu(rsp->SecurityBufferOffset);
if (offsetof(struct smb2_sess_setup_rsp, Buffer) != boff) {
cifs_dbg(VFS, "Invalid security buffer offset %d\n", boff);
rc = smb_EIO1(smb_eio_trace_sess_buf_off, boff);
goto out;
}
rc = decode_ntlmssp_challenge(rsp->Buffer,
le16_to_cpu(rsp->SecurityBufferLength), ses);
if (rc)
goto out;
cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
spin_lock(&ses->ses_lock);
is_binding = (ses->ses_status == SES_GOOD);
spin_unlock(&ses->ses_lock);
/* keep existing ses id and flags if binding */
if (!is_binding) {
ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
ses->session_flags = le16_to_cpu(rsp->SessionFlags);
}
out:
kfree_sensitive(ntlmssp_blob);
SMB2_sess_free_buffer(sess_data);
if (!rc) {
sess_data->result = 0;
sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
return;
}
out_err:
kfree_sensitive(ses->ntlmssp);
ses->ntlmssp = NULL;
sess_data->result = rc;
sess_data->func = NULL;
}
static void
SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
{
int rc;
struct cifs_ses *ses = sess_data->ses;
struct TCP_Server_Info *server = sess_data->server;
struct smb2_sess_setup_req *req;
struct smb2_sess_setup_rsp *rsp = NULL;
unsigned char *ntlmssp_blob = NULL;
bool use_spnego = false; /* else use raw ntlmssp */
u16 blob_length = 0;
bool is_binding = false;
rc = SMB2_sess_alloc_buffer(sess_data);
if (rc)
goto out;
req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
req->hdr.SessionId = cpu_to_le64(ses->Suid);
rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,
ses, server,
sess_data->nls_cp);
if (rc) {
cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
goto out;
}
if (use_spnego) {
/* BB eventually need to add this */
cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
rc = -EOPNOTSUPP;
goto out;
}
sess_data->iov[1].iov_base = ntlmssp_blob;
sess_data->iov[1].iov_len = blob_length;
rc = SMB2_sess_sendreceive(sess_data);
if (rc)
goto out;
rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
spin_lock(&ses->ses_lock);
is_binding = (ses->ses_status == SES_GOOD);
spin_unlock(&ses->ses_lock);
/* keep existing ses id and flags if binding */
if (!is_binding) {
ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
ses->session_flags = le16_to_cpu(rsp->SessionFlags);
}
rc = SMB2_sess_establish_session(sess_data);
#ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
if (ses->server->dialect < SMB30_PROT_ID) {
cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
/*
* The session id is opaque in terms of endianness, so we can't
* print it as a long long. we dump it as we got it on the wire
*/
cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid),
&ses->Suid);
cifs_dbg(VFS, "Session Key %*ph\n",
SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
cifs_dbg(VFS, "Signing Key %*ph\n",
SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
}
#endif
out:
kfree_sensitive(ntlmssp_blob);
SMB2_sess_free_buffer(sess_data);
kfree_sensitive(ses->ntlmssp);
ses->ntlmssp = NULL;
sess_data->result = rc;
sess_data->func = NULL;
}
static int
SMB2_select_sec(struct SMB2_sess_data *sess_data)
{
int type;
struct cifs_ses *ses = sess_data->ses;
struct TCP_Server_Info *server = sess_data->server;
type = smb2_select_sectype(server, ses->sectype);
cifs_dbg(FYI, "sess setup type %d\n", type);
if (type == Unspecified) {
cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
return -EINVAL;
}
switch (type) {
case Kerberos:
sess_data->func = SMB2_auth_kerberos;
break;
case RawNTLMSSP:
sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
break;
default:
cifs_dbg(VFS, "secType %d not supported!\n", type);
return -EOPNOTSUPP;
}
return 0;
}
int
SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
struct TCP_Server_Info *server,
const struct nls_table *nls_cp)
{
int rc = 0;
struct SMB2_sess_data *sess_data;
cifs_dbg(FYI, "Session Setup\n");
if (!server) {
WARN(1, "%s: server is NULL!\n", __func__);
return smb_EIO(smb_eio_trace_null_pointers);
}
sess_data = kzalloc_obj(struct SMB2_sess_data);
if (!sess_data)
return -ENOMEM;
sess_data->xid = xid;
sess_data->ses = ses;
sess_data->server = server;
sess_data->buf0_type = CIFS_NO_BUFFER;
sess_data->nls_cp = (struct nls_table *) nls_cp;
sess_data->previous_session = ses->Suid;
rc = SMB2_select_sec(sess_data);
if (rc)
goto out;
/*
* Initialize the session hash with the server one.
*/
memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
SMB2_PREAUTH_HASH_SIZE);
while (sess_data->func)
sess_data->func(sess_data);
if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
rc = sess_data->result;
out:
kfree_sensitive(sess_data);
return rc;
}
int
SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
{
struct smb_rqst rqst;
struct smb2_logoff_req *req; /* response is also trivial struct */
int rc = 0;
struct TCP_Server_Info *server;
int flags = 0;
unsigned int total_len;
struct kvec iov[1];
struct kvec rsp_iov;
int resp_buf_type;
cifs_dbg(FYI, "disconnect session %p\n", ses);
if (!ses || !ses->server)
return smb_EIO(smb_eio_trace_null_pointers);
server = ses->server;
/* no need to send SMB logoff if uid already closed due to reconnect */
spin_lock(&ses->chan_lock);
if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
spin_unlock(&ses->chan_lock);
goto smb2_session_already_dead;
}
spin_unlock(&ses->chan_lock);
rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
(void **) &req, &total_len);
if (rc)
return rc;
/* since no tcon, smb2_init can not do this, so do here */
req->hdr.SessionId = cpu_to_le64(ses->Suid);
if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
flags |= CIFS_TRANSFORM_REQ;
else if (server->sign)
req->hdr.Flags |= SMB2_FLAGS_SIGNED;
flags |= CIFS_NO_RSP_BUF;
iov[0].iov_base = (char *)req;
iov[0].iov_len = total_len;
memset(&rqst, 0, sizeof(struct smb_rqst));
rqst.rq_iov = iov;
rqst.rq_nvec = 1;
rc = cifs_send_recv(xid, ses, ses->server,
&rqst, &resp_buf_type, flags, &rsp_iov);
cifs_small_buf_release(req);
/*
* No tcon so can't do
* cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
*/
smb2_session_already_dead:
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 */)
/* These are similar values to what Windows uses */
static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
{
tcon->max_chunks = 256;
tcon->max_bytes_chunk = 1048576;
tcon->max_bytes_copy = 16777216;
}
int
SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
struct cifs_tcon *tcon, const struct nls_table *cp)
{
struct smb_rqst rqst;
struct smb2_tree_connect_req *req;
struct smb2_tree_connect_rsp *rsp = NULL;
struct kvec iov[2];
struct kvec rsp_iov = { NULL, 0 };
int rc = 0;
int resp_buftype;
int unc_path_len;
__le16 *unc_path = NULL;
int flags = 0;
unsigned int total_len;
struct TCP_Server_Info *server = cifs_pick_channel(ses);
cifs_dbg(FYI, "TCON\n");
if (!server || !tree)
return smb_EIO(smb_eio_trace_null_pointers);
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);
if (unc_path_len <= 0) {
kfree(unc_path);
return -EINVAL;
}
unc_path_len *= 2;
/* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
tcon->tid = 0;
atomic_set(&tcon->num_remote_opens, 0);
rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
(void **) &req, &total_len);
if (rc) {
kfree(unc_path);
return rc;
}
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
iov[0].iov_base = (char *)req;
/* 1 for pad */
iov[0].iov_len = total_len - 1;
/* Testing shows that buffer offset must be at location of Buffer[0] */
req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req));
req->PathLength = cpu_to_le16(unc_path_len);
iov[1].iov_base = unc_path;
iov[1].iov_len = unc_path_len;
/*
* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
* unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
* (Samba servers don't always set the flag so also check if null user)
*/
if ((server->dialect == SMB311_PROT_ID) &&
!smb3_encryption_required(tcon) &&
!(ses->session_flags &
(SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
((ses->user_name != NULL) || (ses->sectype == Kerberos)))
req->hdr.Flags |= SMB2_FLAGS_SIGNED;
memset(&rqst, 0, sizeof(struct smb_rqst));
rqst.rq_iov = iov;
rqst.rq_nvec = 2;
/* Need 64 for max size write so ask for more in case not there yet */
if (server->credits >= server->max_credits)
req->hdr.CreditRequest = cpu_to_le16(0);
else
req->hdr.CreditRequest = cpu_to_le16(
min_t(int, server->max_credits -
server->credits, 64));
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
cifs_small_buf_release(req);
rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
if ((rc != 0) || (rsp == NULL)) {
cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
tcon->need_reconnect = true;
goto tcon_error_exit;
}
switch (rsp->ShareType) {
case SMB2_SHARE_TYPE_DISK:
cifs_dbg(FYI, "connection to disk share\n");
break;
case SMB2_SHARE_TYPE_PIPE:
tcon->pipe = true;
cifs_dbg(FYI, "connection to pipe share\n");
break;
case SMB2_SHARE_TYPE_PRINT:
tcon->print = true;
cifs_dbg(FYI, "connection to printer\n");
break;
default:
cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
rc = -EOPNOTSUPP;
goto tcon_error_exit;
}
tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);
strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
if (tcon->seal &&
!(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
init_copy_chunk_defaults(tcon);
if (server->ops->validate_negotiate)
rc = server->ops->validate_negotiate(xid, tcon);
if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */
if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT)
server->nosharesock = true;
tcon_exit:
free_rsp_buf(resp_buftype, rsp);
kfree(unc_path);
return rc;
tcon_error_exit:
if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)
cifs_dbg(VFS | ONCE, "BAD_NETWORK_NAME: %s\n", tree);
goto tcon_exit;
}
int
SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
{
struct smb_rqst rqst;
struct smb2_tree_disconnect_req *req; /* response is trivial */
int rc = 0;
struct cifs_ses *ses = tcon->ses;
struct TCP_Server_Info *server = cifs_pick_channel(ses);
int flags = 0;
unsigned int total_len;
struct kvec iov[1];
struct kvec rsp_iov;
int resp_buf_type;
cifs_dbg(FYI, "Tree Disconnect\n");
if (!ses || !(ses->server))
return smb_EIO(smb_eio_trace_null_pointers);
trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name);
spin_lock(&ses->chan_lock);
if ((tcon->need_reconnect) ||
(CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {
spin_unlock(&ses->chan_lock);
return 0;
}
spin_unlock(&ses->chan_lock);
invalidate_all_cached_dirs(tcon, true);
rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, server,
(void **) &req,
&total_len);
if (rc)
return rc;
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
flags |= CIFS_NO_RSP_BUF;
iov[0].iov_base = (char *)req;
iov[0].iov_len = total_len;
memset(&rqst, 0, sizeof(struct smb_rqst));
rqst.rq_iov = iov;
rqst.rq_nvec = 1;
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buf_type, flags, &rsp_iov);
cifs_small_buf_release(req);
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc);
}
trace_smb3_tdis_done(xid, tcon->tid, ses->Suid);
return rc;
}
static create_durable_req_t *
create_durable_buf(void)
{
create_durable_req_t *buf;
buf = kzalloc_obj(create_durable_req_t);
if (!buf)
return NULL;
buf->ccontext.DataOffset = cpu_to_le16(offsetof
(create_durable_req_t, Data));
buf->ccontext.DataLength = cpu_to_le32(16);
buf->ccontext.NameOffset = cpu_to_le16(offsetof
(create_durable_req_t, Name));
buf->ccontext.NameLength = cpu_to_le16(4);
/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
buf->Name[0] = 'D';
buf->Name[1] = 'H';
buf->Name[2] = 'n';
buf->Name[3] = 'Q';
return buf;
}
static create_durable_req_t *
create_reconnect_durable_buf(struct cifs_fid *fid)
{
create_durable_req_t *buf;
buf = kzalloc_obj(create_durable_req_t);
if (!buf)
return NULL;
buf->ccontext.DataOffset = cpu_to_le16(offsetof
(create_durable_req_t, Data));
buf->ccontext.DataLength = cpu_to_le32(16);
buf->ccontext.NameOffset = cpu_to_le16(offsetof
(create_durable_req_t, Name));
buf->ccontext.NameLength = cpu_to_le16(4);
buf->Data.Fid.PersistentFileId = fid->persistent_fid;
buf->Data.Fid.VolatileFileId = fid->volatile_fid;
/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
buf->Name[0] = 'D';
buf->Name[1] = 'H';
buf->Name[2] = 'n';
buf->Name[3] = 'C';
return buf;
}
static void
parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
{
struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc;
cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
pdisk_id->DiskFileId, pdisk_id->VolumeId);
buf->IndexNumber = pdisk_id->DiskFileId;
}
static void
parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
struct create_posix_rsp *posix)
{
int sid_len;
u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
u8 *end = beg + le32_to_cpu(cc->DataLength);
u8 *sid;
memset(posix, 0, sizeof(*posix));
posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
sid = beg + 12;
sid_len = posix_info_sid_size(sid, end);
if (sid_len < 0) {
cifs_dbg(VFS, "bad owner sid in posix create response\n");
return;
}
memcpy(&posix->owner, sid, sid_len);
sid = sid + sid_len;
sid_len = posix_info_sid_size(sid, end);
if (sid_len < 0) {
cifs_dbg(VFS, "bad group sid in posix create response\n");
return;
}
memcpy(&posix->group, sid, sid_len);
cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
posix->nlink, posix->mode, posix->reparse_tag);
}
int smb2_parse_contexts(struct TCP_Server_Info *server,
struct kvec *rsp_iov,
__u16 *epoch,
char *lease_key, __u8 *oplock,
struct smb2_file_all_info *buf,
struct create_posix_rsp *posix)
{
struct smb2_create_rsp *rsp = rsp_iov->iov_base;
struct create_context *cc;
size_t rem, off, len;
size_t doff, dlen;
size_t noff, nlen;
char *name;
static const char smb3_create_tag_posix[] = {
0x93, 0xAD, 0x25, 0x50, 0x9C,
0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
0xDE, 0x96, 0x8B, 0xCD, 0x7C
};
*oplock = 0;
off = le32_to_cpu(rsp->CreateContextsOffset);
rem = le32_to_cpu(rsp->CreateContextsLength);
if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len)
return -EINVAL;
cc = (struct create_context *)((u8 *)rsp + off);
/* Initialize inode number to 0 in case no valid data in qfid context */
if (buf)
buf->IndexNumber = 0;
while (rem >= sizeof(*cc)) {
doff = le16_to_cpu(cc->DataOffset);
dlen = le32_to_cpu(cc->DataLength);
if (check_add_overflow(doff, dlen, &len) || len > rem)
return -EINVAL;
noff = le16_to_cpu(cc->NameOffset);
nlen = le16_to_cpu(cc->NameLength);
if (noff + nlen > doff)
return -EINVAL;
name = (char *)cc + noff;
switch (nlen) {
case 4:
if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) {
*oplock = server->ops->parse_lease_buf(cc, epoch,
lease_key);
} else if (buf &&
!strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) {
parse_query_id_ctxt(cc, buf);
}
break;
case 16:
if (posix && !memcmp(name, smb3_create_tag_posix, 16))
parse_posix_ctxt(cc, buf, posix);
break;
default:
cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n",
__func__, nlen, dlen);
if (IS_ENABLED(CONFIG_CIFS_DEBUG2))
cifs_dump_mem("context data: ", cc, dlen);
break;
}
off = le32_to_cpu(cc->Next);
if (!off)
break;
if (check_sub_overflow(rem, off, &rem))
return -EINVAL;
cc = (struct create_context *)((u8 *)cc + off);
}
if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
*oplock = rsp->OplockLevel;
return 0;
}
static int
add_lease_context(struct TCP_Server_Info *server,
struct smb2_create_req *req,
struct kvec *iov,
unsigned int *num_iovec,
u8 *lease_key,
__u8 *oplock,
u8 *parent_lease_key,
__le32 flags)
{
unsigned int num = *num_iovec;
iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock,
parent_lease_key, flags);
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = server->vals->create_lease_size;
req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
*num_iovec = num + 1;
return 0;
}
static struct create_durable_req_v2 *
create_durable_v2_buf(struct cifs_open_parms *oparms)
{
struct cifs_fid *pfid = oparms->fid;
struct create_durable_req_v2 *buf;
buf = kzalloc_obj(struct create_durable_req_v2);
if (!buf)
return NULL;
buf->ccontext.DataOffset = cpu_to_le16(offsetof
(struct create_durable_req_v2, dcontext));
buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2_req));
buf->ccontext.NameOffset = cpu_to_le16(offsetof
(struct create_durable_req_v2, Name));
buf->ccontext.NameLength = cpu_to_le16(4);
/*
* NB: Handle timeout defaults to 0, which allows server to choose
* (most servers default to 120 seconds) and most clients default to 0.
* This can be overridden at mount ("handletimeout=") if the user wants
* a different persistent (or resilient) handle timeout for all opens
* on a particular SMB3 mount.
*/
buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
/* for replay, we should not overwrite the existing create guid */
if (!oparms->replay) {
generate_random_uuid(buf->dcontext.CreateGuid);
memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
} else
memcpy(buf->dcontext.CreateGuid, pfid->create_guid, 16);
/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
buf->Name[0] = 'D';
buf->Name[1] = 'H';
buf->Name[2] = '2';
buf->Name[3] = 'Q';
return buf;
}
static struct create_durable_handle_reconnect_v2 *
create_reconnect_durable_v2_buf(struct cifs_fid *fid)
{
struct create_durable_handle_reconnect_v2 *buf;
buf = kzalloc_obj(struct create_durable_handle_reconnect_v2);
if (!buf)
return NULL;
buf->ccontext.DataOffset =
cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
dcontext));
buf->ccontext.DataLength =
cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
buf->ccontext.NameOffset =
cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
Name));
buf->ccontext.NameLength = cpu_to_le16(4);
buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
buf->Name[0] = 'D';
buf->Name[1] = 'H';
buf->Name[2] = '2';
buf->Name[3] = 'C';
return buf;
}
static int
add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
struct cifs_open_parms *oparms)
{
unsigned int num = *num_iovec;
iov[num].iov_base = create_durable_v2_buf(oparms);
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = sizeof(struct create_durable_req_v2);
*num_iovec = num + 1;
return 0;
}
static int
add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
struct cifs_open_parms *oparms)
{
unsigned int num = *num_iovec;
/* indicate that we don't need to relock the file */
oparms->reconnect = false;
iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
*num_iovec = num + 1;
return 0;
}
static int
add_durable_context(struct kvec *iov, unsigned int *num_iovec,
struct cifs_open_parms *oparms, bool use_persistent)
{
unsigned int num = *num_iovec;
if (use_persistent) {
if (oparms->reconnect)
return add_durable_reconnect_v2_context(iov, num_iovec,
oparms);
else
return add_durable_v2_context(iov, num_iovec, oparms);
}
if (oparms->reconnect) {
iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
/* indicate that we don't need to relock the file */
oparms->reconnect = false;
} else
iov[num].iov_base = create_durable_buf();
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = sizeof(create_durable_req_t);
*num_iovec = num + 1;
return 0;
}
/* See MS-SMB2 2.2.13.2.7 */
static struct crt_twarp_ctxt *
create_twarp_buf(__u64 timewarp)
{
struct crt_twarp_ctxt *buf;
buf = kzalloc_obj(struct crt_twarp_ctxt);
if (!buf)
return NULL;
buf->ccontext.DataOffset = cpu_to_le16(offsetof
(struct crt_twarp_ctxt, Timestamp));
buf->ccontext.DataLength = cpu_to_le32(8);
buf->ccontext.NameOffset = cpu_to_le16(offsetof
(struct crt_twarp_ctxt, Name));
buf->ccontext.NameLength = cpu_to_le16(4);
/* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
buf->Name[0] = 'T';
buf->Name[1] = 'W';
buf->Name[2] = 'r';
buf->Name[3] = 'p';
buf->Timestamp = cpu_to_le64(timewarp);
return buf;
}
/* See MS-SMB2 2.2.13.2.7 */
static int
add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
{
unsigned int num = *num_iovec;
iov[num].iov_base = create_twarp_buf(timewarp);
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
*num_iovec = num + 1;
return 0;
}
/* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
static void setup_owner_group_sids(char *buf)
{
struct owner_group_sids *sids = (struct owner_group_sids *)buf;
/* Populate the user ownership fields S-1-5-88-1 */
sids->owner.Revision = 1;
sids->owner.NumAuth = 3;
sids->owner.Authority[5] = 5;
sids->owner.SubAuthorities[0] = cpu_to_le32(88);
sids->owner.SubAuthorities[1] = cpu_to_le32(1);
sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
/* Populate the group ownership fields S-1-5-88-2 */
sids->group.Revision = 1;
sids->group.NumAuth = 3;
sids->group.Authority[5] = 5;
sids->group.SubAuthorities[0] = cpu_to_le32(88);
sids->group.SubAuthorities[1] = cpu_to_le32(2);
sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
}
/* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
static struct crt_sd_ctxt *
create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
{
struct crt_sd_ctxt *buf;
__u8 *ptr, *aclptr;
unsigned int acelen, acl_size, ace_count;
unsigned int owner_offset = 0;
unsigned int group_offset = 0;
struct smb3_acl acl = {};
*len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct smb_ace) * 4), 8);
if (set_owner) {
/* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
*len += sizeof(struct owner_group_sids);
}
buf = kzalloc(*len, GFP_KERNEL);
if (buf == NULL)
return buf;
ptr = (__u8 *)&buf[1];
if (set_owner) {
/* offset fields are from beginning of security descriptor not of create context */
owner_offset = ptr - (__u8 *)&buf->sd;
buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
group_offset = owner_offset + offsetof(struct owner_group_sids, group);
buf->sd.OffsetGroup = cpu_to_le32(group_offset);
setup_owner_group_sids(ptr);
ptr += sizeof(struct owner_group_sids);
} else {
buf->sd.OffsetOwner = 0;
buf->sd.OffsetGroup = 0;
}
buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
buf->ccontext.NameLength = cpu_to_le16(4);
/* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
buf->Name[0] = 'S';
buf->Name[1] = 'e';
buf->Name[2] = 'c';
buf->Name[3] = 'D';
buf->sd.Revision = 1; /* Must be one see MS-DTYP 2.4.6 */
/*
* ACL is "self relative" ie ACL is stored in contiguous block of memory
* and "DP" ie the DACL is present
*/
buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
/* offset owner, group and Sbz1 and SACL are all zero */
buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
/* Ship the ACL for now. we will copy it into buf later. */
aclptr = ptr;
ptr += sizeof(struct smb3_acl);
/* create one ACE to hold the mode embedded in reserved special SID */
acelen = setup_special_mode_ACE((struct smb_ace *)ptr, false, (__u64)mode);
ptr += acelen;
acl_size = acelen + sizeof(struct smb3_acl);
ace_count = 1;
if (set_owner) {
/* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
acelen = setup_special_user_owner_ACE((struct smb_ace *)ptr);
ptr += acelen;
acl_size += acelen;
ace_count += 1;
}
/* and one more ACE to allow access for authenticated users */
acelen = setup_authusers_ACE((struct smb_ace *)ptr);
ptr += acelen;
acl_size += acelen;
ace_count += 1;
acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
acl.AclSize = cpu_to_le16(acl_size);
acl.AceCount = cpu_to_le16(ace_count);
/* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
memcpy(aclptr, &acl, sizeof(struct smb3_acl));
buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
*len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);
return buf;
}
static int
add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
{
unsigned int num = *num_iovec;
unsigned int len = 0;
iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = len;
*num_iovec = num + 1;
return 0;
}
static struct crt_query_id_ctxt *
create_query_id_buf(void)
{
struct crt_query_id_ctxt *buf;
buf = kzalloc_obj(struct crt_query_id_ctxt);
if (!buf)
return NULL;
buf->ccontext.DataOffset = cpu_to_le16(0);
buf->ccontext.DataLength = cpu_to_le32(0);
buf->ccontext.NameOffset = cpu_to_le16(offsetof
(struct crt_query_id_ctxt, Name));
buf->ccontext.NameLength = cpu_to_le16(4);
/* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
buf->Name[0] = 'Q';
buf->Name[1] = 'F';
buf->Name[2] = 'i';
buf->Name[3] = 'd';
return buf;
}
/* See MS-SMB2 2.2.13.2.9 */
static int
add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
{
unsigned int num = *num_iovec;
iov[num].iov_base = create_query_id_buf();
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
*num_iovec = num + 1;
return 0;
}
static void add_ea_context(struct cifs_open_parms *oparms,
struct kvec *rq_iov, unsigned int *num_iovs)
{
struct kvec *iov = oparms->ea_cctx;
if (iov && iov->iov_base && iov->iov_len) {
rq_iov[(*num_iovs)++] = *iov;
memset(iov, 0, sizeof(*iov));
}
}
static int
alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
const char *treename, const __le16 *path)
{
int treename_len, path_len;
struct nls_table *cp;
const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
/*
* skip leading "\\"
*/
treename_len = strlen(treename);
if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
return -EINVAL;
treename += 2;
treename_len -= 2;
path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
/* make room for one path separator only if @path isn't empty */
*out_len = treename_len + (path[0] ? 1 : 0) + path_len;
/*
* final path needs to be 8-byte aligned as specified in
* MS-SMB2 2.2.13 SMB2 CREATE Request.
*/
*out_size = round_up(*out_len * sizeof(__le16), 8);
*out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);
if (!*out_path)
return -ENOMEM;
cp = load_nls_default();
cifs_strtoUTF16(*out_path, treename, treename_len, cp);
/* Do not append the separator if the path is empty */
if (path[0] != cpu_to_le16(0x0000)) {
UniStrcat((wchar_t *)*out_path, (wchar_t *)sep);
UniStrcat((wchar_t *)*out_path, (wchar_t *)path);
}
unload_nls(cp);
return 0;
}
int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
umode_t mode, struct cifs_tcon *tcon,
const char *full_path,
struct cifs_sb_info *cifs_sb)
{
struct smb_rqst rqst;
struct smb2_create_req *req;
struct smb2_create_rsp *rsp = NULL;
struct cifs_ses *ses = tcon->ses;
struct kvec iov[3]; /* make sure at least one for each open context */
struct kvec rsp_iov = {NULL, 0};
int resp_buftype;
int uni_path_len;
__le16 *copy_path = NULL;
int copy_size;
int rc = 0;
unsigned int n_iov = 2;
__u32 file_attributes = 0;
char *pc_buf = NULL;
int flags = 0;
unsigned int total_len;
__le16 *utf16_path = NULL;
struct TCP_Server_Info *server;
int retries = 0, cur_sleep = 0;
replay_again:
/* reinitialize for possible replay */
pc_buf = NULL;
flags = 0;
n_iov = 2;
server = cifs_pick_channel(ses);
cifs_dbg(FYI, "mkdir\n");
/* resource #1: path allocation */
utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
if (!utf16_path)
return -ENOMEM;
if (!ses || !server) {
rc = smb_EIO(smb_eio_trace_null_pointers);
goto err_free_path;
}
/* resource #2: request */
rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
(void **) &req, &total_len);
if (rc)
goto err_free_path;
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
req->ImpersonationLevel = IL_IMPERSONATION;
req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
/* 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(FILE_CREATE);
req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
iov[0].iov_base = (char *)req;
/* -1 since last byte is buf[0] which is sent below (path) */
iov[0].iov_len = total_len - 1;
req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
/* [MS-SMB2] 2.2.13 NameOffset:
* If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
* the SMB2 header, the file name includes a prefix that will
* be processed during DFS name normalization as specified in
* section 3.3.5.9. Otherwise, the file name is relative to
* the share that is identified by the TreeId in the SMB2
* header.
*/
if (tcon->share_flags & SHI1005_FLAGS_DFS) {
int name_len;
req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
&name_len,
tcon->tree_name, utf16_path);
if (rc)
goto err_free_req;
req->NameLength = cpu_to_le16(name_len * 2);
uni_path_len = copy_size;
/* free before overwriting resource */
kfree(utf16_path);
utf16_path = copy_path;
} else {
uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
/* MUST set path len (NameLength) to 0 opening root of share */
req->NameLength = cpu_to_le16(uni_path_len - 2);
if (uni_path_len % 8 != 0) {
copy_size = roundup(uni_path_len, 8);
copy_path = kzalloc(copy_size, GFP_KERNEL);
if (!copy_path) {
rc = -ENOMEM;
goto err_free_req;
}
memcpy((char *)copy_path, (const char *)utf16_path,
uni_path_len);
uni_path_len = copy_size;
/* free before overwriting resource */
kfree(utf16_path);
utf16_path = copy_path;
}
}
iov[1].iov_len = uni_path_len;
iov[1].iov_base = utf16_path;
req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
if (tcon->posix_extensions) {
/* resource #3: posix buf */
rc = add_posix_context(iov, &n_iov, mode);
if (rc)
goto err_free_req;
req->CreateContextsOffset = cpu_to_le32(
sizeof(struct smb2_create_req) +
iov[1].iov_len);
le32_add_cpu(&req->CreateContextsLength, iov[n_iov-1].iov_len);
pc_buf = iov[n_iov-1].iov_base;
}
memset(&rqst, 0, sizeof(struct smb_rqst));
rqst.rq_iov = iov;
rqst.rq_nvec = n_iov;
/* no need to inc num_remote_opens because we close it just below */
trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE,
FILE_WRITE_ATTRIBUTES);
if (retries) {
/* Back-off before retry */
if (cur_sleep)
msleep(cur_sleep);
smb2_set_replay(server, &rqst);
}
/* resource #4: response buffer */
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
CREATE_NOT_FILE,
FILE_WRITE_ATTRIBUTES, rc);
goto err_free_rsp_buf;
}
/*
* Although unlikely to be possible for rsp to be null and rc not set,
* adding check below is slightly safer long term (and quiets Coverity
* warning)
*/
rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
if (rsp == NULL) {
rc = smb_EIO(smb_eio_trace_mkdir_no_rsp);
kfree(pc_buf);
goto err_free_req;
}
trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES,
rsp->OplockLevel);
SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
/* Eventually save off posix specific response info and timestamps */
err_free_rsp_buf:
free_rsp_buf(resp_buftype, rsp_iov.iov_base);
kfree(pc_buf);
err_free_req:
cifs_small_buf_release(req);
err_free_path:
kfree(utf16_path);
if (is_replayable_error(rc) &&
smb2_should_replay(tcon, &retries, &cur_sleep))
goto replay_again;
return rc;
}
int
SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
struct smb_rqst *rqst, __u8 *oplock,
struct cifs_open_parms *oparms, __le16 *path)
{
struct smb2_create_req *req;
unsigned int n_iov = 2;
__u32 file_attributes = 0;
int copy_size;
int uni_path_len;
unsigned int total_len;
struct kvec *iov = rqst->rq_iov;
__le16 *copy_path;
int rc;
rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
(void **) &req, &total_len);
if (rc)
return rc;
iov[0].iov_base = (char *)req;
/* -1 since last byte is buf[0] which is sent below (path) */
iov[0].iov_len = total_len - 1;
if (oparms->create_options & CREATE_OPTION_READONLY)
file_attributes |= ATTR_READONLY;
if (oparms->create_options & CREATE_OPTION_SPECIAL)
file_attributes |= ATTR_SYSTEM;
req->ImpersonationLevel = IL_IMPERSONATION;
req->DesiredAccess = cpu_to_le32(oparms->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(oparms->disposition);
req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
/* [MS-SMB2] 2.2.13 NameOffset:
* If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
* the SMB2 header, the file name includes a prefix that will
* be processed during DFS name normalization as specified in
* section 3.3.5.9. Otherwise, the file name is relative to
* the share that is identified by the TreeId in the SMB2
* header.
*/
if (tcon->share_flags & SHI1005_FLAGS_DFS) {
int name_len;
req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
&name_len,
tcon->tree_name, path);
if (rc)
return rc;
req->NameLength = cpu_to_le16(name_len * 2);
uni_path_len = copy_size;
path = copy_path;
} else {
uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
/* MUST set path len (NameLength) to 0 opening root of share */
req->NameLength = cpu_to_le16(uni_path_len - 2);
copy_size = round_up(uni_path_len, 8);
copy_path = kzalloc(copy_size, GFP_KERNEL);
if (!copy_path)
return -ENOMEM;
memcpy((char *)copy_path, (const char *)path,
uni_path_len);
uni_path_len = copy_size;
path = copy_path;
}
iov[1].iov_len = uni_path_len;
iov[1].iov_base = path;
if ((!server->oplocks) || (tcon->no_lease))
*oplock = SMB2_OPLOCK_LEVEL_NONE;
if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
*oplock == SMB2_OPLOCK_LEVEL_NONE)
req->RequestedOplockLevel = *oplock;
else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
(oparms->create_options & CREATE_NOT_FILE))
req->RequestedOplockLevel = *oplock; /* no srv lease support */
else {
rc = add_lease_context(server, req, iov, &n_iov,
oparms->fid->lease_key, oplock,
oparms->fid->parent_lease_key,
oparms->lease_flags);
if (rc)
return rc;
}
if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
rc = add_durable_context(iov, &n_iov, oparms,
tcon->use_persistent);
if (rc)
return rc;
}
if (tcon->posix_extensions) {
rc = add_posix_context(iov, &n_iov, oparms->mode);
if (rc)
return rc;
}
if (tcon->snapshot_time) {
cifs_dbg(FYI, "adding snapshot context\n");
rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
if (rc)
return rc;
}
if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
unsigned int sbflags = cifs_sb_flags(oparms->cifs_sb);
bool set_mode;
bool set_owner;
if ((sbflags & CIFS_MOUNT_MODE_FROM_SID) &&
oparms->mode != ACL_NO_MODE) {
set_mode = true;
} else {
set_mode = false;
oparms->mode = ACL_NO_MODE;
}
set_owner = sbflags & CIFS_MOUNT_UID_FROM_ACL;
if (set_owner | set_mode) {
cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
if (rc)
return rc;
}
}
add_query_id_context(iov, &n_iov);
add_ea_context(oparms, iov, &n_iov);
if (n_iov > 2) {
/*
* We have create contexts behind iov[1] (the file
* name), point at them from the main create request
*/
req->CreateContextsOffset = cpu_to_le32(
sizeof(struct smb2_create_req) +
iov[1].iov_len);
req->CreateContextsLength = 0;
for (unsigned int i = 2; i < (n_iov-1); i++) {
struct kvec *v = &iov[i];
size_t len = v->iov_len;
struct create_context *cctx =
(struct create_context *)v->iov_base;
cctx->Next = cpu_to_le32(len);
le32_add_cpu(&req->CreateContextsLength, len);
}
le32_add_cpu(&req->CreateContextsLength,
iov[n_iov-1].iov_len);
}
rqst->rq_nvec = n_iov;
return 0;
}
/* rq_iov[0] is the request and is released by cifs_small_buf_release().
* All other vectors are freed by kfree().
*/
void
SMB2_open_free(struct smb_rqst *rqst)
{
int i;
if (rqst && rqst->rq_iov) {
cifs_small_buf_release(rqst->rq_iov[0].iov_base);
for (i = 1; i < rqst->rq_nvec; i++)
if (rqst->rq_iov[i].iov_base != smb2_padding)
kfree(rqst->rq_iov[i].iov_base);
}
}
int
SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
__u8 *oplock, struct smb2_file_all_info *buf,
struct create_posix_rsp *posix,
struct kvec *err_iov, int *buftype)
{
struct smb_rqst rqst;
struct smb2_create_rsp *rsp = NULL;
struct cifs_tcon *tcon = oparms->tcon;
struct cifs_ses *ses = tcon->ses;
struct TCP_Server_Info *server;
struct kvec iov[SMB2_CREATE_IOV_SIZE];
struct kvec rsp_iov = {NULL, 0};
int resp_buftype = CIFS_NO_BUFFER;
int rc = 0;
int flags = 0;
int retries = 0, cur_sleep = 0;
replay_again:
/* reinitialize for possible replay */
flags = 0;
server = cifs_pick_channel(ses);
oparms->replay = !!(retries);
cifs_dbg(FYI, "create/open\n");
if (!ses || !server)
return smb_EIO(smb_eio_trace_null_pointers);
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
memset(&rqst, 0, sizeof(struct smb_rqst));
memset(&iov, 0, sizeof(iov));
rqst.rq_iov = iov;
rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
rc = SMB2_open_init(tcon, server,
&rqst, oplock, oparms, path);
if (rc)
goto creat_exit;
trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path,
oparms->create_options, oparms->desired_access);
if (retries) {
/* Back-off before retry */
if (cur_sleep)
msleep(cur_sleep);
smb2_set_replay(server, &rqst);
}
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags,
&rsp_iov);
rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
if (rc != 0) {
cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
if (err_iov && rsp) {
*err_iov = rsp_iov;
*buftype = resp_buftype;
resp_buftype = CIFS_NO_BUFFER;
rsp = NULL;
}
trace_smb3_open_err(xid, tcon->tid, ses->Suid,
oparms->create_options, oparms->desired_access, rc);
if (rc == -EREMCHG) {
pr_warn_once("server share %s deleted\n",
tcon->tree_name);
tcon->need_reconnect = true;
}
goto creat_exit;
} else if (rsp == NULL) /* unlikely to happen, but safer to check */
goto creat_exit;
atomic_inc(&tcon->num_remote_opens);
oparms->fid->persistent_fid = rsp->PersistentFileId;
oparms->fid->volatile_fid = rsp->VolatileFileId;
oparms->fid->access = oparms->desired_access;
#ifdef CONFIG_CIFS_DEBUG2
oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);
#endif /* CIFS_DEBUG2 */
if (buf) {
buf->CreationTime = rsp->CreationTime;
buf->LastAccessTime = rsp->LastAccessTime;
buf->LastWriteTime = rsp->LastWriteTime;
buf->ChangeTime = rsp->ChangeTime;
buf->AllocationSize = rsp->AllocationSize;
buf->EndOfFile = rsp->EndofFile;
buf->Attributes = rsp->FileAttributes;
buf->NumberOfLinks = cpu_to_le32(1);
buf->DeletePending = 0; /* successful open = not delete pending */
}
rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch,
oparms->fid->lease_key, oplock, buf, posix);
trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
oparms->create_options, oparms->desired_access,
*oplock);
creat_exit:
SMB2_open_free(&rqst);
free_rsp_buf(resp_buftype, rsp);
if (is_replayable_error(rc) &&
smb2_should_replay(tcon, &retries, &cur_sleep))
goto replay_again;
return rc;
}
int
SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
struct smb_rqst *rqst,
u64 persistent_fid, u64 volatile_fid, u32 opcode,
char *in_data, u32 indatalen,
__u32 max_response_size)
{
struct smb2_ioctl_req *req;
struct kvec *iov = rqst->rq_iov;
unsigned int total_len;
int rc;
char *in_data_buf;
rc = smb2_ioctl_req_init(opcode, tcon, server,
(void **) &req, &total_len);
if (rc)
return rc;
if (indatalen) {
/*
* indatalen is usually small at a couple of bytes max, so
* just allocate through generic pool
*/
in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
if (!in_data_buf) {
cifs_small_buf_release(req);
return -ENOMEM;
}
}
req->CtlCode = cpu_to_le32(opcode);
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
iov[0].iov_base = (char *)req;
/*
* If no input data, the size of ioctl struct in
* protocol spec still includes a 1 byte data buffer,
* but if input data passed to ioctl, we do not
* want to double count this, so we do not send
* the dummy one byte of data in iovec[0] if sending
* input data (in iovec[1]).
*/
if (indatalen) {
req->InputCount = cpu_to_le32(indatalen);
/* do not set InputOffset if no input data */
req->InputOffset =
cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
rqst->rq_nvec = 2;
iov[0].iov_len = total_len - 1;
iov[1].iov_base = in_data_buf;
iov[1].iov_len = indatalen;
} else {
rqst->rq_nvec = 1;
iov[0].iov_len = total_len;
}
req->OutputOffset = 0;
req->OutputCount = 0; /* MBZ */
/*
* In most cases max_response_size is set to 16K (CIFSMaxBufSize)
* We Could increase default MaxOutputResponse, but that could require
* more credits. Windows typically sets this smaller, but for some
* ioctls it may be useful to allow server to send more. No point
* limiting what the server can send as long as fits in one credit
* We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
* to increase this limit up in the future.
* Note that for snapshot queries that servers like Azure expect that
* the first query be minimal size (and just used to get the number/size
* of previous versions) so response size must be specified as EXACTLY
* sizeof(struct snapshot_array) which is 16 when rounded up to multiple
* of eight bytes. Currently that is the only case where we set max
* response size smaller.
*/
req->MaxOutputResponse = cpu_to_le32(max_response_size);
req->hdr.CreditCharge =
cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
SMB2_MAX_BUFFER_SIZE));
/* always an FSCTL (for now) */
req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
/* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
req->hdr.Flags |= SMB2_FLAGS_SIGNED;
return 0;
}
void
SMB2_ioctl_free(struct smb_rqst *rqst)
{
int i;
if (rqst && rqst->rq_iov) {
cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
for (i = 1; i < rqst->rq_nvec; i++)
if (rqst->rq_iov[i].iov_base != smb2_padding)
kfree(rqst->rq_iov[i].iov_base);
}
}
/*
* SMB2 IOCTL is used for both IOCTLs and FSCTLs
*/
int
SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
u32 max_out_data_len, char **out_data,
u32 *plen /* returned data len */)
{
struct smb_rqst rqst;
struct smb2_ioctl_rsp *rsp = NULL;
struct cifs_ses *ses;
struct TCP_Server_Info *server;
struct kvec iov[SMB2_IOCTL_IOV_SIZE];
struct kvec rsp_iov = {NULL, 0};
int resp_buftype = CIFS_NO_BUFFER;
int rc = 0;
int flags = 0;
int retries = 0, cur_sleep = 0;
if (!tcon)
return smb_EIO(smb_eio_trace_null_pointers);
ses = tcon->ses;
if (!ses)
return smb_EIO(smb_eio_trace_null_pointers);
replay_again:
/* reinitialize for possible replay */
flags = 0;
server = cifs_pick_channel(ses);
if (!server)
return smb_EIO(smb_eio_trace_null_pointers);
cifs_dbg(FYI, "SMB2 IOCTL\n");
if (out_data != NULL)
*out_data = NULL;
/* zero out returned data len, in case of error */
if (plen)
*plen = 0;
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
memset(&rqst, 0, sizeof(struct smb_rqst));
memset(&iov, 0, sizeof(iov));
rqst.rq_iov = iov;
rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
rc = SMB2_ioctl_init(tcon, server,
&rqst, persistent_fid, volatile_fid, opcode,
in_data, indatalen, max_out_data_len);
if (rc)
goto ioctl_exit;
if (retries) {
/* Back-off before retry */
if (cur_sleep)
msleep(cur_sleep);
smb2_set_replay(server, &rqst);
}
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags,
&rsp_iov);
rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
if (rc != 0)
trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
ses->Suid, 0, opcode, rc);
if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
goto ioctl_exit;
} else if (rc == -EINVAL) {
if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
(opcode != FSCTL_SRV_COPYCHUNK)) {
cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
goto ioctl_exit;
}
} else if (rc == -E2BIG) {
if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
goto ioctl_exit;
}
}
/* check if caller wants to look at return data or just return rc */
if ((plen == NULL) || (out_data == NULL))
goto ioctl_exit;
/*
* Although unlikely to be possible for rsp to be null and rc not set,
* adding check below is slightly safer long term (and quiets Coverity
* warning)
*/
if (rsp == NULL) {
rc = smb_EIO(smb_eio_trace_ioctl_no_rsp);
goto ioctl_exit;
}
*plen = le32_to_cpu(rsp->OutputCount);
/* We check for obvious errors in the output buffer length and offset */
if (*plen == 0)
goto ioctl_exit; /* server returned no data */
else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
rc = smb_EIO2(smb_eio_trace_ioctl_data_len, *plen, rsp_iov.iov_len);
*plen = 0;
goto ioctl_exit;
}
u32 outoff = le32_to_cpu(rsp->OutputOffset);
if (rsp_iov.iov_len - *plen < outoff) {
cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n",
*plen, outoff);
rc = smb_EIO2(smb_eio_trace_ioctl_out_off, rsp_iov.iov_len - *plen, outoff);
*plen = 0;
goto ioctl_exit;
}
*out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
*plen, GFP_KERNEL);
if (*out_data == NULL) {
rc = -ENOMEM;
goto ioctl_exit;
}
ioctl_exit:
SMB2_ioctl_free(&rqst);
free_rsp_buf(resp_buftype, rsp);
if (is_replayable_error(rc) &&
smb2_should_replay(tcon, &retries, &cur_sleep))
goto replay_again;
return rc;
}
/*
* Individual callers to ioctl worker function follow
*/
int
SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid)
{
int rc;
struct compress_ioctl fsctl_input;
char *ret_data = NULL;
fsctl_input.CompressionState =
cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
FSCTL_SET_COMPRESSION,
(char *)&fsctl_input /* data input */,
2 /* in data len */, CIFSMaxBufSize /* max out data */,
&ret_data /* out data */, NULL);
cifs_dbg(FYI, "set compression rc %d\n", rc);
return rc;
}
int
SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
struct smb_rqst *rqst,
u64 persistent_fid, u64 volatile_fid, bool query_attrs)
{
struct smb2_close_req *req;
struct kvec *iov = rqst->rq_iov;
unsigned int total_len;
int rc;
rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
(void **) &req, &total_len);
if (rc)
return rc;
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
if (query_attrs)
req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
else
req->Flags = 0;
iov[0].iov_base = (char *)req;
iov[0].iov_len = total_len;
return 0;
}
void
SMB2_close_free(struct smb_rqst *rqst)
{
if (rqst && rqst->rq_iov)
cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
}
int
__SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid,
struct smb2_file_network_open_info *pbuf)
{
struct smb_rqst rqst;
struct smb2_close_rsp *rsp = NULL;
struct cifs_ses *ses = tcon->ses;
struct TCP_Server_Info *server;
struct kvec iov[1];
struct kvec rsp_iov;
int resp_buftype = CIFS_NO_BUFFER;
int rc = 0;
int flags = 0;
bool query_attrs = false;
int retries = 0, cur_sleep = 0;
replay_again:
/* reinitialize for possible replay */
flags = 0;
query_attrs = false;
server = cifs_pick_channel(ses);
cifs_dbg(FYI, "Close\n");
if (!ses || !server)
return smb_EIO(smb_eio_trace_null_pointers);
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
memset(&rqst, 0, sizeof(struct smb_rqst));
memset(&iov, 0, sizeof(iov));
rqst.rq_iov = iov;
rqst.rq_nvec = 1;
/* check if need to ask server to return timestamps in close response */
if (pbuf)
query_attrs = true;
trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
rc = SMB2_close_init(tcon, server,
&rqst, persistent_fid, volatile_fid,
query_attrs);
if (rc)
goto close_exit;
if (retries) {
/* Back-off before retry */
if (cur_sleep)
msleep(cur_sleep);
smb2_set_replay(server, &rqst);
}
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
if (rc != 0) {
cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
rc);
goto close_exit;
} else {
trace_smb3_close_done(xid, persistent_fid, tcon->tid,
ses->Suid);
if (pbuf)
memcpy(&pbuf->network_open_info,
&rsp->network_open_info,
sizeof(pbuf->network_open_info));
atomic_dec(&tcon->num_remote_opens);
}
close_exit:
SMB2_close_free(&rqst);
free_rsp_buf(resp_buftype, rsp);
/* retry close in a worker thread if this one is interrupted */
if (is_interrupt_error(rc)) {
int tmp_rc;
tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
volatile_fid);
if (tmp_rc)
cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
persistent_fid, tmp_rc);
}
if (is_replayable_error(rc) &&
smb2_should_replay(tcon, &retries, &cur_sleep))
goto replay_again;
return rc;
}
int
SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid)
{
return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
}
int
smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
struct kvec *iov, unsigned int min_buf_size)
{
unsigned int smb_len = iov->iov_len;
char *end_of_smb = smb_len + (char *)iov->iov_base;
char *begin_of_buf = offset + (char *)iov->iov_base;
char *end_of_buf = begin_of_buf + buffer_length;
if (buffer_length < min_buf_size) {
cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
buffer_length, min_buf_size);
return -EINVAL;
}
/* check if beyond RFC1001 maximum length */
if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
buffer_length, smb_len);
return -EINVAL;
}
if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
return -EINVAL;
}
return 0;
}
/*
* If SMB buffer fields are valid, copy into temporary buffer to hold result.
* Caller must free buffer.
*/
int
smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
struct kvec *iov, unsigned int minbufsize,
char *data)
{
char *begin_of_buf = offset + (char *)iov->iov_base;
int rc;
if (!data)
return -EINVAL;
rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
if (rc)
return rc;
memcpy(data, begin_of_buf, minbufsize);
return 0;
}
int
SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
struct smb_rqst *rqst,
u64 persistent_fid, u64 volatile_fid,
u8 info_class, u8 info_type, u32 additional_info,
size_t output_len, size_t input_len, void *input)
{
struct smb2_query_info_req *req;
struct kvec *iov = rqst->rq_iov;
unsigned int total_len;
size_t len;
int rc;
if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) ||
len > CIFSMaxBufSize))
return -EINVAL;
rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
(void **) &req, &total_len);
if (rc)
return rc;
req->InfoType = info_type;
req->FileInfoClass = info_class;
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
req->AdditionalInformation = cpu_to_le32(additional_info);
req->OutputBufferLength = cpu_to_le32(output_len);
if (input_len) {
req->InputBufferLength = cpu_to_le32(input_len);
/* total_len for smb query request never close to le16 max */
req->InputBufferOffset = cpu_to_le16(total_len - 1);
memcpy(req->Buffer, input, input_len);
}
iov[0].iov_base = (char *)req;
/* 1 for Buffer */
iov[0].iov_len = len;
return 0;
}
void
SMB2_query_info_free(struct smb_rqst *rqst)
{
if (rqst && rqst->rq_iov)
cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
}
static int
query_info(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
u32 additional_info, size_t output_len, size_t min_len, void **data,
u32 *dlen)
{
struct smb_rqst rqst;
struct smb2_query_info_rsp *rsp = NULL;
struct kvec iov[1];
struct kvec rsp_iov;
int rc = 0;
int resp_buftype = CIFS_NO_BUFFER;
struct cifs_ses *ses = tcon->ses;
struct TCP_Server_Info *server;
int flags = 0;
bool allocated = false;
int retries = 0, cur_sleep = 0;
cifs_dbg(FYI, "Query Info\n");
if (!ses)
return smb_EIO(smb_eio_trace_null_pointers);
replay_again:
/* reinitialize for possible replay */
flags = 0;
allocated = false;
server = cifs_pick_channel(ses);
if (!server)
return smb_EIO(smb_eio_trace_null_pointers);
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
memset(&rqst, 0, sizeof(struct smb_rqst));
memset(&iov, 0, sizeof(iov));
rqst.rq_iov = iov;
rqst.rq_nvec = 1;
rc = SMB2_query_info_init(tcon, server,
&rqst, persistent_fid, volatile_fid,
info_class, info_type, additional_info,
output_len, 0, NULL);
if (rc)
goto qinf_exit;
trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
ses->Suid, info_class, (__u32)info_type);
if (retries) {
/* Back-off before retry */
if (cur_sleep)
msleep(cur_sleep);
smb2_set_replay(server, &rqst);
}
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
ses->Suid, info_class, (__u32)info_type, rc);
goto qinf_exit;
}
trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
ses->Suid, info_class, (__u32)info_type);
if (dlen) {
*dlen = le32_to_cpu(rsp->OutputBufferLength);
if (!*data) {
*data = kmalloc(*dlen, GFP_KERNEL);
if (!*data) {
cifs_tcon_dbg(VFS,
"Error %d allocating memory for acl\n",
rc);
*dlen = 0;
rc = -ENOMEM;
goto qinf_exit;
}
allocated = true;
}
}
rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
le32_to_cpu(rsp->OutputBufferLength),
&rsp_iov, dlen ? *dlen : min_len, *data);
if (rc && allocated) {
kfree(*data);
*data = NULL;
*dlen = 0;
}
qinf_exit:
SMB2_query_info_free(&rqst);
free_rsp_buf(resp_buftype, rsp);
if (is_replayable_error(rc) &&
smb2_should_replay(tcon, &retries, &cur_sleep))
goto replay_again;
return rc;
}
int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
{
return query_info(xid, tcon, persistent_fid, volatile_fid,
FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
sizeof(struct smb2_file_all_info), (void **)&data,
NULL);
}
int
SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid,
void **data, u32 *plen, u32 extra_info)
{
*plen = 0;
return query_info(xid, tcon, persistent_fid, volatile_fid,
0, SMB2_O_INFO_SECURITY, extra_info,
SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
}
int
SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
{
return query_info(xid, tcon, persistent_fid, volatile_fid,
FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
sizeof(struct smb2_file_internal_info),
sizeof(struct smb2_file_internal_info),
(void **)&uniqueid, NULL);
}
/*
* CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
* See MS-SMB2 2.2.35 and 2.2.36
*/
static int
SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
struct cifs_tcon *tcon, struct TCP_Server_Info *server,
u64 persistent_fid, u64 volatile_fid,
u32 completion_filter, bool watch_tree)
{
struct smb2_change_notify_req *req;
struct kvec *iov = rqst->rq_iov;
unsigned int total_len;
int rc;
rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
(void **) &req, &total_len);
if (rc)
return rc;
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
/* See note 354 of MS-SMB2, 64K max */
req->OutputBufferLength =
cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
req->CompletionFilter = cpu_to_le32(completion_filter);
if (watch_tree)
req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
else
req->Flags = 0;
iov[0].iov_base = (char *)req;
iov[0].iov_len = total_len;
return 0;
}
int
SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, bool watch_tree,
u32 completion_filter, u32 max_out_data_len, char **out_data,
u32 *plen /* returned data len */)
{
struct cifs_ses *ses = tcon->ses;
struct TCP_Server_Info *server;
struct smb_rqst rqst;
struct smb2_change_notify_rsp *smb_rsp;
struct kvec iov[1];
struct kvec rsp_iov = {NULL, 0};
int resp_buftype = CIFS_NO_BUFFER;
int flags = 0;
int rc = 0;
int retries = 0, cur_sleep = 0;
replay_again:
/* reinitialize for possible replay */
flags = 0;
server = cifs_pick_channel(ses);
cifs_dbg(FYI, "change notify\n");
if (!ses || !server)
return smb_EIO(smb_eio_trace_null_pointers);
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
memset(&rqst, 0, sizeof(struct smb_rqst));
memset(&iov, 0, sizeof(iov));
if (plen)
*plen = 0;
rqst.rq_iov = iov;
rqst.rq_nvec = 1;
rc = SMB2_notify_init(xid, &rqst, tcon, server,
persistent_fid, volatile_fid,
completion_filter, watch_tree);
if (rc)
goto cnotify_exit;
trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
(u8)watch_tree, completion_filter);
if (retries) {
/* Back-off before retry */
if (cur_sleep)
msleep(cur_sleep);
smb2_set_replay(server, &rqst);
}
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
if (rc != 0) {
cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
(u8)watch_tree, completion_filter, rc);
} else {
trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
ses->Suid, (u8)watch_tree, completion_filter);
/* validate that notify information is plausible */
if ((rsp_iov.iov_base == NULL) ||
(rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1))
goto cnotify_exit;
smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;
rc = smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset),
le32_to_cpu(smb_rsp->OutputBufferLength),
&rsp_iov,
sizeof(struct file_notify_information));
if (rc)
goto cnotify_exit;
*out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset),
le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL);
if (*out_data == NULL) {
rc = -ENOMEM;
goto cnotify_exit;
} else if (plen)
*plen = le32_to_cpu(smb_rsp->OutputBufferLength);
}
cnotify_exit:
if (rqst.rq_iov)
cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
free_rsp_buf(resp_buftype, rsp_iov.iov_base);
if (is_replayable_error(rc) &&
smb2_should_replay(tcon, &retries, &cur_sleep))
goto replay_again;
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 TCP_Server_Info *server, struct mid_q_entry *mid)
{
struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
struct cifs_credits credits = { .value = 0, .instance = 0 };
if (mid->mid_state == MID_RESPONSE_RECEIVED
|| mid->mid_state == MID_RESPONSE_MALFORMED) {
credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
credits.instance = server->reconnect_instance;
}
release_mid(server, mid);
add_credits(server, &credits, CIFS_ECHO_OP);
}
static void cifs_renegotiate_iosize(struct TCP_Server_Info *server,
struct cifs_tcon *tcon)
{
struct cifs_sb_info *cifs_sb;
if (server == NULL || tcon == NULL)
return;
spin_lock(&tcon->sb_list_lock);
list_for_each_entry(cifs_sb, &tcon->cifs_sb_list, tcon_sb_link)
cifs_negotiate_iosize(server, cifs_sb->ctx, tcon);
spin_unlock(&tcon->sb_list_lock);
}
void smb2_reconnect_server(struct work_struct *work)
{
struct TCP_Server_Info *server = container_of(work,
struct TCP_Server_Info, reconnect.work);
struct TCP_Server_Info *pserver;
struct cifs_ses *ses, *ses2;
struct cifs_tcon *tcon, *tcon2;
struct list_head tmp_list, tmp_ses_list;
bool ses_exist = false;
bool tcon_selected = false;
int rc;
bool resched = false;
/* first check if ref count has reached 0, if not inc ref count */
spin_lock(&cifs_tcp_ses_lock);
if (!server->srv_count) {
spin_unlock(&cifs_tcp_ses_lock);
return;
}
server->srv_count++;
spin_unlock(&cifs_tcp_ses_lock);
/* If server is a channel, select the primary channel */
pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
/* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
mutex_lock(&pserver->reconnect_mutex);
/* if the server is marked for termination, drop the ref count here */
if (server->terminate) {
cifs_put_tcp_session(server, true);
mutex_unlock(&pserver->reconnect_mutex);
return;
}
INIT_LIST_HEAD(&tmp_list);
INIT_LIST_HEAD(&tmp_ses_list);
cifs_dbg(FYI, "Reconnecting tcons and channels\n");
spin_lock(&cifs_tcp_ses_lock);
list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
spin_lock(&ses->ses_lock);
if (ses->ses_status == SES_EXITING) {
spin_unlock(&ses->ses_lock);
continue;
}
spin_unlock(&ses->ses_lock);
tcon_selected = false;
list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
if (tcon->need_reconnect || tcon->need_reopen_files) {
spin_lock(&tcon->tc_lock);
tcon->tc_count++;
spin_unlock(&tcon->tc_lock);
trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
netfs_trace_tcon_ref_get_reconnect_server);
list_add_tail(&tcon->rlist, &tmp_list);
tcon_selected = true;
}
}
/*
* IPC has the same lifetime as its session and uses its
* refcount.
*/
if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
tcon_selected = true;
cifs_smb_ses_inc_refcount(ses);
}
/*
* handle the case where channel needs to reconnect
* binding session, but tcon is healthy (some other channel
* is active)
*/
spin_lock(&ses->chan_lock);
if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {
list_add_tail(&ses->rlist, &tmp_ses_list);
ses_exist = true;
cifs_smb_ses_inc_refcount(ses);
}
spin_unlock(&ses->chan_lock);
}
spin_unlock(&cifs_tcp_ses_lock);
list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
if (!rc) {
cifs_renegotiate_iosize(server, tcon);
cifs_reopen_persistent_handles(tcon);
} else
resched = true;
list_del_init(&tcon->rlist);
if (tcon->ipc)
cifs_put_smb_ses(tcon->ses);
else
cifs_put_tcon(tcon, netfs_trace_tcon_ref_put_reconnect_server);
}
if (!ses_exist)
goto done;
/* allocate a dummy tcon struct used for reconnect */
tcon = tcon_info_alloc(false, netfs_trace_tcon_ref_new_reconnect_server);
if (!tcon) {
resched = true;
list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
list_del_init(&ses->rlist);
cifs_put_smb_ses(ses);
}
goto done;
}
tcon->status = TID_GOOD;
tcon->dummy = true;
/* now reconnect sessions for necessary channels */
list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
tcon->ses = ses;
rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
if (rc)
resched = true;
list_del_init(&ses->rlist);
cifs_put_smb_ses(ses);
}
tconInfoFree(tcon, netfs_trace_tcon_ref_free_reconnect_server);
done:
cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
if (resched)
cifs_requeue_server_reconn(server);
mutex_unlock(&pserver->reconnect_mutex);
/* now we can safely release srv struct */
cifs_put_tcp_session(server, true);
}
int
SMB2_echo(struct TCP_Server_Info *server)
{
struct smb2_echo_req *req;
int rc = 0;
struct kvec iov[1];
struct smb_rqst rqst = { .rq_iov = iov,
.rq_nvec = 1 };
unsigned int total_len;
cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
spin_lock(&server->srv_lock);
if (server->ops->need_neg &&
server->ops->need_neg(server)) {
spin_unlock(&server->srv_lock);
/* No need to send echo on newly established connections */
cifs_queue_server_reconn(server);
return rc;
}
spin_unlock(&server->srv_lock);
rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
(void **)&req, &total_len);
if (rc)
return rc;
req->hdr.CreditRequest = cpu_to_le16(1);
iov[0].iov_len = total_len;
iov[0].iov_base = (char *)req;
rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
server, CIFS_ECHO_OP, NULL);
if (rc)
cifs_dbg(FYI, "Echo request failed: %d\n", rc);
cifs_small_buf_release(req);
return rc;
}
void
SMB2_flush_free(struct smb_rqst *rqst)
{
if (rqst && rqst->rq_iov)
cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
}
int
SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
struct cifs_tcon *tcon, struct TCP_Server_Info *server,
u64 persistent_fid, u64 volatile_fid)
{
struct smb2_flush_req *req;
struct kvec *iov = rqst->rq_iov;
unsigned int total_len;
int rc;
rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
(void **) &req, &total_len);
if (rc)
return rc;
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
iov[0].iov_base = (char *)req;
iov[0].iov_len = total_len;
return 0;
}
int
SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
u64 volatile_fid)
{
struct cifs_ses *ses = tcon->ses;
struct smb_rqst rqst;
struct kvec iov[1];
struct kvec rsp_iov = {NULL, 0};
struct TCP_Server_Info *server;
int resp_buftype = CIFS_NO_BUFFER;
int flags = 0;
int rc = 0;
int retries = 0, cur_sleep = 0;
replay_again:
/* reinitialize for possible replay */
flags = 0;
server = cifs_pick_channel(ses);
cifs_dbg(FYI, "flush\n");
if (!ses || !(ses->server))
return smb_EIO(smb_eio_trace_null_pointers);
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
memset(&rqst, 0, sizeof(struct smb_rqst));
memset(&iov, 0, sizeof(iov));
rqst.rq_iov = iov;
rqst.rq_nvec = 1;
rc = SMB2_flush_init(xid, &rqst, tcon, server,
persistent_fid, volatile_fid);
if (rc)
goto flush_exit;
trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
if (retries) {
/* Back-off before retry */
if (cur_sleep)
msleep(cur_sleep);
smb2_set_replay(server, &rqst);
}
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
if (rc != 0) {
cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
rc);
} else
trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
ses->Suid);
flush_exit:
SMB2_flush_free(&rqst);
free_rsp_buf(resp_buftype, rsp_iov.iov_base);
if (is_replayable_error(rc) &&
smb2_should_replay(tcon, &retries, &cur_sleep))
goto replay_again;
return rc;
}
#ifdef CONFIG_CIFS_SMB_DIRECT
static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms)
{
struct TCP_Server_Info *server = io_parms->server;
struct cifs_tcon *tcon = io_parms->tcon;
/* we can only offload if we're connected */
if (!server || !tcon)
return false;
/* we can only offload on an rdma connection */
if (!server->rdma || !server->smbd_conn)
return false;
/* we don't support signed offload yet */
if (server->sign)
return false;
/* we don't support encrypted offload yet */
if (smb3_encryption_required(tcon))
return false;
/* offload also has its overhead, so only do it if desired */
if (io_parms->length < server->rdma_readwrite_threshold)
return false;
return true;
}
#endif /* CONFIG_CIFS_SMB_DIRECT */
/*
* To form a chain of read requests, any read requests after the first should
* have the end_of_chain boolean set to true.
*/
static int
smb2_new_read_req(void **buf, unsigned int *total_len,
struct cifs_io_parms *io_parms, struct cifs_io_subrequest *rdata,
unsigned int remaining_bytes, int request_type)
{
int rc = -EACCES;
struct smb2_read_req *req = NULL;
struct smb2_hdr *shdr;
struct TCP_Server_Info *server = io_parms->server;
rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
(void **) &req, total_len);
if (rc)
return rc;
if (server == NULL)
return -ECONNABORTED;
shdr = &req->hdr;
shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
req->PersistentFileId = io_parms->persistent_fid;
req->VolatileFileId = io_parms->volatile_fid;
req->ReadChannelInfoOffset = 0; /* reserved */
req->ReadChannelInfoLength = 0; /* reserved */
req->Channel = 0; /* reserved */
req->MinimumCount = 0;
req->Length = cpu_to_le32(io_parms->length);
req->Offset = cpu_to_le64(io_parms->offset);
trace_smb3_read_enter(rdata ? rdata->rreq->debug_id : 0,
rdata ? rdata->subreq.debug_index : 0,
rdata ? rdata->xid : 0,
io_parms->persistent_fid,
io_parms->tcon->tid, io_parms->tcon->ses->Suid,
io_parms->offset, io_parms->length);
#ifdef CONFIG_CIFS_SMB_DIRECT
/*
* If we want to do a RDMA write, fill in and append
* smbdirect_buffer_descriptor_v1 to the end of read request
*/
if (rdata && smb3_use_rdma_offload(io_parms)) {
struct smbdirect_buffer_descriptor_v1 *v1;
struct iov_iter iter;
bool need_invalidate = server->dialect == SMB30_PROT_ID;
iov_iter_bvec_queue(&iter, ITER_DEST,
rdata->subreq.content.bvecq, rdata->subreq.content.slot,
rdata->subreq.content.offset, rdata->subreq.len);
rdata->mr = smbd_register_mr(server->smbd_conn, &iter,
true, need_invalidate);
if (!rdata->mr)
return -EAGAIN;
req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
if (need_invalidate)
req->Channel = SMB2_CHANNEL_RDMA_V1;
req->ReadChannelInfoOffset =
cpu_to_le16(offsetof(struct smb2_read_req, Buffer));
req->ReadChannelInfoLength =
cpu_to_le16(sizeof(struct smbdirect_buffer_descriptor_v1));
v1 = (struct smbdirect_buffer_descriptor_v1 *) &req->Buffer[0];
smbd_mr_fill_buffer_descriptor(rdata->mr, v1);
*total_len += sizeof(*v1) - 1;
}
#endif
if (request_type & CHAINED_REQUEST) {
if (!(request_type & END_OF_CHAIN)) {
/* next 8-byte aligned request */
*total_len = ALIGN(*total_len, 8);
shdr->NextCommand = cpu_to_le32(*total_len);
} else /* END_OF_CHAIN */
shdr->NextCommand = 0;
if (request_type & RELATED_REQUEST) {
shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
/*
* Related requests use info from previous read request
* in chain.
*/
shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);
shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);
req->PersistentFileId = (u64)-1;
req->VolatileFileId = (u64)-1;
}
}
if (remaining_bytes > io_parms->length)
req->RemainingBytes = cpu_to_le32(remaining_bytes);
else
req->RemainingBytes = 0;
*buf = req;
return rc;
}
static void
smb2_readv_callback(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
struct cifs_io_subrequest *rdata = mid->callback_data;
struct netfs_inode *ictx = netfs_inode(rdata->rreq->inode);
struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
struct smb2_hdr *shdr = (struct smb2_hdr *)rdata->iov[0].iov_base;
struct inode *inode = &ictx->inode;
struct cifs_credits credits = {
.value = 0,
.instance = 0,
.rreq_debug_id = rdata->rreq->debug_id,
.rreq_debug_index = rdata->subreq.debug_index,
};
struct smb_rqst rqst = { .rq_iov = &rdata->iov[0], .rq_nvec = 1 };
unsigned int rreq_debug_id = rdata->rreq->debug_id;
unsigned int subreq_debug_index = rdata->subreq.debug_index;
if (rdata->got_bytes)
iov_iter_bvec_queue(&rqst.rq_iter, ITER_DEST,
rdata->subreq.content.bvecq, rdata->subreq.content.slot,
rdata->subreq.content.offset, rdata->subreq.len);
WARN_ONCE(rdata->server != server,
"rdata server %p != mid server %p",
rdata->server, server);
cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu/%zu\n",
__func__, mid->mid, mid->mid_state, rdata->result,
rdata->got_bytes, rdata->subreq.len - rdata->subreq.transferred);
switch (mid->mid_state) {
case MID_RESPONSE_RECEIVED:
credits.value = le16_to_cpu(shdr->CreditRequest);
credits.instance = server->reconnect_instance;
/* result already set, check signature */
if (server->sign && !mid->decrypted) {
int rc;
iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
rc = smb2_verify_signature(&rqst, server);
if (rc) {
cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
rc);
rdata->subreq.error = rc;
rdata->result = rc;
if (is_replayable_error(rc)) {
trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_retry_needed);
__set_bit(NETFS_SREQ_NEED_RETRY, &rdata->subreq.flags);
} else
trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_bad);
} else
trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_progress);
}
/* FIXME: should this be counted toward the initiating task? */
task_io_account_read(rdata->got_bytes);
cifs_stats_bytes_read(tcon, rdata->got_bytes);
break;
case MID_REQUEST_SUBMITTED:
trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_req_submitted);
goto do_retry;
case MID_RETRY_NEEDED:
trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_retry_needed);
do_retry:
__set_bit(NETFS_SREQ_NEED_RETRY, &rdata->subreq.flags);
rdata->result = -EAGAIN;
if (server->sign && rdata->got_bytes)
/* reset bytes number since we can not check a sign */
rdata->got_bytes = 0;
/* FIXME: should this be counted toward the initiating task? */
task_io_account_read(rdata->got_bytes);
cifs_stats_bytes_read(tcon, rdata->got_bytes);
break;
case MID_RESPONSE_MALFORMED:
trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_malformed);
credits.value = le16_to_cpu(shdr->CreditRequest);
credits.instance = server->reconnect_instance;
rdata->result = smb_EIO(smb_eio_trace_read_rsp_malformed);
break;
default:
trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_unknown);
rdata->result = smb_EIO1(smb_eio_trace_read_mid_state_unknown,
mid->mid_state);
break;
}
#ifdef CONFIG_CIFS_SMB_DIRECT
/*
* If this rdata has a memory registered, the MR can be freed
* MR needs to be freed as soon as I/O finishes to prevent deadlock
* because they have limited number and are used for future I/Os
*/
if (rdata->mr) {
smbd_deregister_mr(rdata->mr);
rdata->mr = NULL;
}
#endif
if (rdata->result && rdata->result != -ENODATA) {
cifs_stats_fail_inc(tcon, SMB2_READ_HE);
trace_smb3_read_err(rdata->rreq->debug_id,
rdata->subreq.debug_index,
rdata->xid,
rdata->req->cfile->fid.persistent_fid,
tcon->tid, tcon->ses->Suid,
rdata->subreq.start + rdata->subreq.transferred,
rdata->subreq.len - rdata->subreq.transferred,
rdata->result);
} else
trace_smb3_read_done(rdata->rreq->debug_id,
rdata->subreq.debug_index,
rdata->xid,
rdata->req->cfile->fid.persistent_fid,
tcon->tid, tcon->ses->Suid,
rdata->subreq.start + rdata->subreq.transferred,
rdata->got_bytes);
if (rdata->result == -ENODATA) {
__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
rdata->result = 0;
} else {
size_t trans = rdata->subreq.transferred + rdata->got_bytes;
if (trans < rdata->subreq.len &&
rdata->subreq.start + trans >= netfs_read_remote_i_size(inode)) {
__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
rdata->result = 0;
}
if (rdata->got_bytes)
__set_bit(NETFS_SREQ_MADE_PROGRESS, &rdata->subreq.flags);
}
/* see if we need to retry */
if (is_replayable_error(rdata->result) &&
smb2_should_replay(tcon,
&rdata->retries,
&rdata->cur_sleep))
rdata->replay = true;
trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, rdata->credits.value,
server->credits, server->in_flight,
0, cifs_trace_rw_credits_read_response_clear);
rdata->credits.value = 0;
rdata->subreq.error = rdata->result;
rdata->subreq.transferred += rdata->got_bytes;
trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_progress);
netfs_read_subreq_terminated(&rdata->subreq);
release_mid(server, mid);
trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
server->credits, server->in_flight,
credits.value, cifs_trace_rw_credits_read_response_add);
add_credits(server, &credits, 0);
}
/* smb2_async_readv - send an async read, and set up mid to handle result */
int
smb2_async_readv(struct cifs_io_subrequest *rdata)
{
int rc, flags = 0;
char *buf;
struct netfs_io_subrequest *subreq = &rdata->subreq;
struct smb2_hdr *shdr;
struct cifs_io_parms io_parms;
struct smb_rqst rqst = { .rq_iov = rdata->iov,
.rq_nvec = 1 };
struct TCP_Server_Info *server;
struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
unsigned int total_len;
int credit_request;
cifs_dbg(FYI, "%s: offset=%llu bytes=%zu\n",
__func__, subreq->start, subreq->len);
if (!rdata->server)
rdata->server = cifs_pick_channel(tcon->ses);
io_parms.tcon = tlink_tcon(rdata->req->cfile->tlink);
io_parms.server = server = rdata->server;
io_parms.offset = subreq->start + subreq->transferred;
io_parms.length = subreq->len - subreq->transferred;
io_parms.persistent_fid = rdata->req->cfile->fid.persistent_fid;
io_parms.volatile_fid = rdata->req->cfile->fid.volatile_fid;
io_parms.pid = rdata->req->pid;
rc = smb2_new_read_req(
(void **) &buf, &total_len, &io_parms, rdata, 0, 0);
if (rc)
goto out;
if (smb3_encryption_required(io_parms.tcon))
flags |= CIFS_TRANSFORM_REQ;
rdata->iov[0].iov_base = buf;
rdata->iov[0].iov_len = total_len;
rdata->got_bytes = 0;
rdata->result = 0;
shdr = (struct smb2_hdr *)buf;
if (rdata->replay) {
/* Back-off before retry */
if (rdata->cur_sleep)
msleep(rdata->cur_sleep);
smb2_set_replay(server, &rqst);
}
if (rdata->credits.value > 0) {
shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(io_parms.length,
SMB2_MAX_BUFFER_SIZE));
credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
if (server->credits >= server->max_credits)
shdr->CreditRequest = cpu_to_le16(0);
else
shdr->CreditRequest = cpu_to_le16(
min_t(int, server->max_credits -
server->credits, credit_request));
rc = adjust_credits(server, rdata, cifs_trace_rw_credits_call_readv_adjust);
if (rc)
goto async_readv_out;
flags |= CIFS_HAS_CREDITS;
}
rc = cifs_call_async(server, &rqst,
cifs_readv_receive, smb2_readv_callback,
smb3_handle_read_data, rdata, flags,
&rdata->credits);
if (rc) {
cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
trace_smb3_read_err(rdata->rreq->debug_id,
subreq->debug_index,
rdata->xid, io_parms.persistent_fid,
io_parms.tcon->tid,
io_parms.tcon->ses->Suid,
io_parms.offset,
subreq->len - subreq->transferred, rc);
}
async_readv_out:
cifs_small_buf_release(buf);
out:
/* if the send error is retryable, let netfs know about it */
if (is_replayable_error(rc) &&
smb2_should_replay(tcon,
&rdata->retries,
&rdata->cur_sleep)) {
trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_retry_needed);
__set_bit(NETFS_SREQ_NEED_RETRY, &rdata->subreq.flags);
}
return rc;
}
int
SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
unsigned int *nbytes, char **buf, int *buf_type)
{
struct smb_rqst rqst;
int resp_buftype, rc;
struct smb2_read_req *req = NULL;
struct smb2_read_rsp *rsp = NULL;
struct kvec iov[1];
struct kvec rsp_iov;
unsigned int total_len;
int flags = CIFS_LOG_ERROR;
struct cifs_ses *ses = io_parms->tcon->ses;
if (!io_parms->server)
io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
*nbytes = 0;
rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
if (rc)
return rc;
if (smb3_encryption_required(io_parms->tcon))
flags |= CIFS_TRANSFORM_REQ;
iov[0].iov_base = (char *)req;
iov[0].iov_len = total_len;
memset(&rqst, 0, sizeof(struct smb_rqst));
rqst.rq_iov = iov;
rqst.rq_nvec = 1;
rc = cifs_send_recv(xid, ses, io_parms->server,
&rqst, &resp_buftype, flags, &rsp_iov);
rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
if (rc) {
if (rc != -ENODATA) {
cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
cifs_dbg(VFS, "Send error in read = %d\n", rc);
trace_smb3_read_err(0, 0, xid,
req->PersistentFileId,
io_parms->tcon->tid, ses->Suid,
io_parms->offset, io_parms->length,
rc);
} else
trace_smb3_read_done(0, 0, xid,
req->PersistentFileId, io_parms->tcon->tid,
ses->Suid, io_parms->offset, 0);
free_rsp_buf(resp_buftype, rsp_iov.iov_base);
cifs_small_buf_release(req);
return rc == -ENODATA ? 0 : rc;
} else
trace_smb3_read_done(0, 0, xid,
req->PersistentFileId,
io_parms->tcon->tid, ses->Suid,
io_parms->offset, io_parms->length);
cifs_small_buf_release(req);
*nbytes = le32_to_cpu(rsp->DataLength);
if ((*nbytes > CIFS_MAX_MSGSIZE) ||
(*nbytes > io_parms->length)) {
cifs_dbg(FYI, "bad length %d for count %d\n",
*nbytes, io_parms->length);
rc = smb_EIO2(smb_eio_trace_read_overlarge,
*nbytes, io_parms->length);
*nbytes = 0;
}
if (*buf) {
memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
free_rsp_buf(resp_buftype, rsp_iov.iov_base);
} else if (resp_buftype != CIFS_NO_BUFFER) {
*buf = rsp_iov.iov_base;
if (resp_buftype == CIFS_SMALL_BUFFER)
*buf_type = CIFS_SMALL_BUFFER;
else if (resp_buftype == CIFS_LARGE_BUFFER)
*buf_type = CIFS_LARGE_BUFFER;
}
return rc;
}
/*
* Check the mid_state and signature on received buffer (if any), and queue the
* workqueue completion task.
*/
static void
smb2_writev_callback(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
struct cifs_io_subrequest *wdata = mid->callback_data;
struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
struct cifs_credits credits = {
.value = 0,
.instance = 0,
.rreq_debug_id = wdata->rreq->debug_id,
.rreq_debug_index = wdata->subreq.debug_index,
};
unsigned int rreq_debug_id = wdata->rreq->debug_id;
unsigned int subreq_debug_index = wdata->subreq.debug_index;
ssize_t result = 0;
size_t written;
WARN_ONCE(wdata->server != server,
"wdata server %p != mid server %p",
wdata->server, server);
switch (mid->mid_state) {
case MID_RESPONSE_RECEIVED:
credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
credits.instance = server->reconnect_instance;
result = smb2_check_receive(mid, server, 0);
if (result != 0) {
if (is_replayable_error(result)) {
trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_retry_needed);
__set_bit(NETFS_SREQ_NEED_RETRY, &wdata->subreq.flags);
} else {
wdata->subreq.error = result;
trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_bad);
}
break;
}
trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_progress);
written = le32_to_cpu(rsp->DataLength);
/*
* Mask off high 16 bits when bytes written as returned
* by the server is greater than bytes requested by the
* client. OS/2 servers are known to set incorrect
* CountHigh values.
*/
if (written > wdata->subreq.len)
written &= 0xFFFF;
cifs_stats_bytes_written(tcon, written);
if (written < wdata->subreq.len) {
result = -ENOSPC;
} else if (written > 0) {
wdata->subreq.len = written;
__set_bit(NETFS_SREQ_MADE_PROGRESS, &wdata->subreq.flags);
}
break;
case MID_REQUEST_SUBMITTED:
trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_req_submitted);
__set_bit(NETFS_SREQ_NEED_RETRY, &wdata->subreq.flags);
result = -EAGAIN;
break;
case MID_RETRY_NEEDED:
trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_retry_needed);
__set_bit(NETFS_SREQ_NEED_RETRY, &wdata->subreq.flags);
result = -EAGAIN;
break;
case MID_RESPONSE_MALFORMED:
trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_malformed);
credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
credits.instance = server->reconnect_instance;
result = smb_EIO(smb_eio_trace_write_rsp_malformed);
break;
default:
trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_unknown);
result = smb_EIO1(smb_eio_trace_write_mid_state_unknown,
mid->mid_state);
break;
}
#ifdef CONFIG_CIFS_SMB_DIRECT
/*
* If this wdata has a memory registered, the MR can be freed
* The number of MRs available is limited, it's important to recover
* used MR as soon as I/O is finished. Hold MR longer in the later
* I/O process can possibly result in I/O deadlock due to lack of MR
* to send request on I/O retry
*/
if (wdata->mr) {
smbd_deregister_mr(wdata->mr);
wdata->mr = NULL;
}
#endif
if (result) {
wdata->result = result;
cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
trace_smb3_write_err(wdata->rreq->debug_id,
wdata->subreq.debug_index,
wdata->xid,
wdata->req->cfile->fid.persistent_fid,
tcon->tid, tcon->ses->Suid, wdata->subreq.start,
wdata->subreq.len, wdata->result);
if (wdata->result == -ENOSPC)
pr_warn_once("Out of space writing to %s\n",
tcon->tree_name);
} else
trace_smb3_write_done(wdata->rreq->debug_id,
wdata->subreq.debug_index,
wdata->xid,
wdata->req->cfile->fid.persistent_fid,
tcon->tid, tcon->ses->Suid,
wdata->subreq.start, wdata->subreq.len);
trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, wdata->credits.value,
server->credits, server->in_flight,
0, cifs_trace_rw_credits_write_response_clear);
wdata->credits.value = 0;
/* see if we need to retry */
if (is_replayable_error(wdata->result) &&
smb2_should_replay(tcon,
&wdata->retries,
&wdata->cur_sleep))
wdata->replay = true;
cifs_write_subrequest_terminated(wdata, result ?: written);
release_mid(server, mid);
trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
server->credits, server->in_flight,
credits.value, cifs_trace_rw_credits_write_response_add);
add_credits(server, &credits, 0);
}
/* smb2_async_writev - send an async write, and set up mid to handle result */
void
smb2_async_writev(struct cifs_io_subrequest *wdata)
{
int rc = -EACCES, flags = 0;
struct smb2_write_req *req = NULL;
struct smb2_hdr *shdr;
struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
struct TCP_Server_Info *server = wdata->server;
struct kvec iov[1];
struct smb_rqst rqst = { };
unsigned int total_len, xid = wdata->xid;
struct cifs_io_parms _io_parms;
struct cifs_io_parms *io_parms = NULL;
int credit_request;
/*
* in future we may get cifs_io_parms passed in from the caller,
* but for now we construct it here...
*/
_io_parms = (struct cifs_io_parms) {
.tcon = tcon,
.server = server,
.offset = wdata->subreq.start,
.length = wdata->subreq.len,
.persistent_fid = wdata->req->cfile->fid.persistent_fid,
.volatile_fid = wdata->req->cfile->fid.volatile_fid,
.pid = wdata->req->pid,
};
io_parms = &_io_parms;
rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
(void **) &req, &total_len);
if (rc)
goto out;
rqst.rq_iov = iov;
iov_iter_bvec_queue(&rqst.rq_iter, ITER_SOURCE,
wdata->subreq.content.bvecq, wdata->subreq.content.slot,
wdata->subreq.content.offset, wdata->subreq.len);
rqst.rq_iov[0].iov_len = total_len - 1;
rqst.rq_iov[0].iov_base = (char *)req;
rqst.rq_nvec += 1;
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
shdr = (struct smb2_hdr *)req;
shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
req->PersistentFileId = io_parms->persistent_fid;
req->VolatileFileId = io_parms->volatile_fid;
req->WriteChannelInfoOffset = 0;
req->WriteChannelInfoLength = 0;
req->Channel = SMB2_CHANNEL_NONE;
req->Length = cpu_to_le32(io_parms->length);
req->Offset = cpu_to_le64(io_parms->offset);
req->DataOffset = cpu_to_le16(
offsetof(struct smb2_write_req, Buffer));
req->RemainingBytes = 0;
trace_smb3_write_enter(wdata->rreq->debug_id,
wdata->subreq.debug_index,
wdata->xid,
io_parms->persistent_fid,
io_parms->tcon->tid,
io_parms->tcon->ses->Suid,
io_parms->offset,
io_parms->length);
#ifdef CONFIG_CIFS_SMB_DIRECT
/*
* If we want to do a server RDMA read, fill in and append
* smbdirect_buffer_descriptor_v1 to the end of write request
*/
if (smb3_use_rdma_offload(io_parms)) {
struct smbdirect_buffer_descriptor_v1 *v1;
struct iov_iter iter;
bool need_invalidate = server->dialect == SMB30_PROT_ID;
iov_iter_bvec_queue(&iter, ITER_SOURCE,
wdata->subreq.content.bvecq, wdata->subreq.content.slot,
wdata->subreq.content.offset, wdata->subreq.len);
wdata->mr = smbd_register_mr(server->smbd_conn, &iter,
false, need_invalidate);
if (!wdata->mr) {
rc = -EAGAIN;
goto async_writev_out;
}
/* For RDMA read, I/O size is in RemainingBytes not in Length */
req->RemainingBytes = req->Length;
req->Length = 0;
req->DataOffset = 0;
req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
if (need_invalidate)
req->Channel = SMB2_CHANNEL_RDMA_V1;
req->WriteChannelInfoOffset =
cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
req->WriteChannelInfoLength =
cpu_to_le16(sizeof(struct smbdirect_buffer_descriptor_v1));
v1 = (struct smbdirect_buffer_descriptor_v1 *) &req->Buffer[0];
smbd_mr_fill_buffer_descriptor(wdata->mr, v1);
rqst.rq_iov[0].iov_len += sizeof(*v1);
/*
* We keep wdata->subreq.io_iter,
* but we have to truncate rqst.rq_iter
*/
iov_iter_truncate(&rqst.rq_iter, 0);
}
#endif
if (wdata->replay) {
/* Back-off before retry */
if (wdata->cur_sleep)
msleep(wdata->cur_sleep);
smb2_set_replay(server, &rqst);
}
cifs_dbg(FYI, "async write at %llu %u bytes len=%zx\n",
io_parms->offset, io_parms->length, wdata->subreq.len);
if (wdata->credits.value > 0) {
shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->subreq.len,
SMB2_MAX_BUFFER_SIZE));
credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
if (server->credits >= server->max_credits)
shdr->CreditRequest = cpu_to_le16(0);
else
shdr->CreditRequest = cpu_to_le16(
min_t(int, server->max_credits -
server->credits, credit_request));
rc = adjust_credits(server, wdata, cifs_trace_rw_credits_call_writev_adjust);
if (rc)
goto async_writev_out;
flags |= CIFS_HAS_CREDITS;
}
/* XXX: compression + encryption is unsupported for now */
if (((flags & CIFS_TRANSFORM_REQ) != CIFS_TRANSFORM_REQ) && should_compress(tcon, &rqst))
flags |= CIFS_COMPRESS_REQ;
rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
wdata, flags, &wdata->credits);
/* Can't touch wdata if rc == 0 */
if (rc) {
trace_smb3_write_err(wdata->rreq->debug_id,
wdata->subreq.debug_index,
xid,
io_parms->persistent_fid,
io_parms->tcon->tid,
io_parms->tcon->ses->Suid,
io_parms->offset,
io_parms->length,
rc);
cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
}
async_writev_out:
cifs_small_buf_release(req);
out:
/* if the send error is retryable, let netfs know about it */
if (is_replayable_error(rc) &&
smb2_should_replay(tcon,
&wdata->retries,
&wdata->cur_sleep)) {
wdata->replay = true;
trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_retry_needed);
__set_bit(NETFS_SREQ_NEED_RETRY, &wdata->subreq.flags);
}
if (rc) {
trace_smb3_rw_credits(wdata->rreq->debug_id,
wdata->subreq.debug_index,
wdata->credits.value,
server->credits, server->in_flight,
-(int)wdata->credits.value,
cifs_trace_rw_credits_write_response_clear);
add_credits_and_wake_if(wdata->server, &wdata->credits, 0);
cifs_write_subrequest_terminated(wdata, rc);
}
}
/*
* SMB2_write function gets iov pointer to kvec array with n_vec as a length.
* The length field from io_parms must be at least 1 and indicates a number of
* elements with data to write that begins with position 1 in iov array. All
* data length is specified by count.
*/
int
SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
unsigned int *nbytes, struct kvec *iov, int n_vec)
{
struct smb_rqst rqst;
int rc = 0;
struct smb2_write_req *req = NULL;
struct smb2_write_rsp *rsp = NULL;
int resp_buftype;
struct kvec rsp_iov;
int flags = 0;
unsigned int total_len;
struct TCP_Server_Info *server;
int retries = 0, cur_sleep = 0;
replay_again:
/* reinitialize for possible replay */
flags = 0;
*nbytes = 0;
if (!io_parms->server)
io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
server = io_parms->server;
if (server == NULL)
return -ECONNABORTED;
if (n_vec < 1)
return rc;
rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
(void **) &req, &total_len);
if (rc)
return rc;
if (smb3_encryption_required(io_parms->tcon))
flags |= CIFS_TRANSFORM_REQ;
req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
req->PersistentFileId = io_parms->persistent_fid;
req->VolatileFileId = io_parms->volatile_fid;
req->WriteChannelInfoOffset = 0;
req->WriteChannelInfoLength = 0;
req->Channel = 0;
req->Length = cpu_to_le32(io_parms->length);
req->Offset = cpu_to_le64(io_parms->offset);
req->DataOffset = cpu_to_le16(
offsetof(struct smb2_write_req, Buffer));
req->RemainingBytes = 0;
trace_smb3_write_enter(0, 0, xid, io_parms->persistent_fid,
io_parms->tcon->tid, io_parms->tcon->ses->Suid,
io_parms->offset, io_parms->length);
iov[0].iov_base = (char *)req;
/* 1 for Buffer */
iov[0].iov_len = total_len - 1;
memset(&rqst, 0, sizeof(struct smb_rqst));
rqst.rq_iov = iov;
/* iov[0] is the SMB header; move payload to rq_iter for encryption safety */
rqst.rq_nvec = 1;
iov_iter_kvec(&rqst.rq_iter, ITER_SOURCE, &iov[1], n_vec,
io_parms->length);
if (retries) {
/* Back-off before retry */
if (cur_sleep)
msleep(cur_sleep);
smb2_set_replay(server, &rqst);
}
rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
&rqst,
&resp_buftype, flags, &rsp_iov);
rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
if (rc) {
trace_smb3_write_err(0, 0, xid,
req->PersistentFileId,
io_parms->tcon->tid,
io_parms->tcon->ses->Suid,
io_parms->offset, io_parms->length, rc);
cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
cifs_dbg(VFS, "Send error in write = %d\n", rc);
} else {
*nbytes = le32_to_cpu(rsp->DataLength);
cifs_stats_bytes_written(io_parms->tcon, *nbytes);
trace_smb3_write_done(0, 0, xid,
req->PersistentFileId,
io_parms->tcon->tid,
io_parms->tcon->ses->Suid,
io_parms->offset, *nbytes);
}
cifs_small_buf_release(req);
free_rsp_buf(resp_buftype, rsp);
if (is_replayable_error(rc) &&
smb2_should_replay(io_parms->tcon, &retries, &cur_sleep))
goto replay_again;
return rc;
}
int posix_info_sid_size(const void *beg, const void *end)
{
size_t subauth;
int total;
if (beg + 1 > end)
return -1;
subauth = *(u8 *)(beg+1);
if (subauth < 1 || subauth > 15)
return -1;
total = 1 + 1 + 6 + 4*subauth;
if (beg + total > end)
return -1;
return total;
}
int posix_info_parse(const void *beg, const void *end,
struct smb2_posix_info_parsed *out)
{
int total_len = 0;
int owner_len, group_len;
int name_len;
const void *owner_sid;
const void *group_sid;
const void *name;
/* if no end bound given, assume payload to be correct */
if (!end) {
const struct smb2_posix_info *p = beg;
end = beg + le32_to_cpu(p->NextEntryOffset);
/* last element will have a 0 offset, pick a sensible bound */
if (end == beg)
end += 0xFFFF;
}
/* check base buf */
if (beg + sizeof(struct smb2_posix_info) > end)
return -1;
total_len = sizeof(struct smb2_posix_info);
/* check owner sid */
owner_sid = beg + total_len;
owner_len = posix_info_sid_size(owner_sid, end);
if (owner_len < 0)
return -1;
total_len += owner_len;
/* check group sid */
group_sid = beg + total_len;
group_len = posix_info_sid_size(group_sid, end);
if (group_len < 0)
return -1;
total_len += group_len;
/* check name len */
if (beg + total_len + 4 > end)
return -1;
name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
if (name_len < 1 || name_len > 0xFFFF)
return -1;
total_len += 4;
/* check name */
name = beg + total_len;
if (name + name_len > end)
return -1;
total_len += name_len;
if (out) {
out->base = beg;
out->size = total_len;
out->name_len = name_len;
out->name = name;
memcpy(&out->owner, owner_sid, owner_len);
memcpy(&out->group, group_sid, group_len);
}
return total_len;
}
static int posix_info_extra_size(const void *beg, const void *end)
{
int len = posix_info_parse(beg, end, NULL);
if (len < 0)
return -1;
return len - sizeof(struct smb2_posix_info);
}
static unsigned int
num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
size_t size)
{
int len;
unsigned int entrycount = 0;
unsigned int next_offset = 0;
char *entryptr;
FILE_DIRECTORY_INFO *dir_info;
if (bufstart == NULL)
return 0;
entryptr = bufstart;
while (1) {
if (entryptr + next_offset < entryptr ||
entryptr + next_offset > end_of_buf ||
entryptr + next_offset + size > end_of_buf) {
cifs_dbg(VFS, "malformed search entry would overflow\n");
break;
}
entryptr = entryptr + next_offset;
dir_info = (FILE_DIRECTORY_INFO *)entryptr;
if (infotype == SMB_FIND_FILE_POSIX_INFO)
len = posix_info_extra_size(entryptr, end_of_buf);
else
len = le32_to_cpu(dir_info->FileNameLength);
if (len < 0 ||
entryptr + len < entryptr ||
entryptr + len > end_of_buf ||
entryptr + len + size > end_of_buf) {
cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
end_of_buf);
break;
}
*lastentry = entryptr;
entrycount++;
next_offset = le32_to_cpu(dir_info->NextEntryOffset);
if (!next_offset)
break;
}
return entrycount;
}
/*
* Readdir/FindFirst
*/
int SMB2_query_directory_init(const unsigned int xid,
struct cifs_tcon *tcon,
struct TCP_Server_Info *server,
struct smb_rqst *rqst,
u64 persistent_fid, u64 volatile_fid,
int index, int info_level)
{
struct smb2_query_directory_req *req;
unsigned char *bufptr;
__le16 asteriks = cpu_to_le16('*');
unsigned int output_size = CIFSMaxBufSize -
MAX_SMB2_CREATE_RESPONSE_SIZE -
MAX_SMB2_CLOSE_RESPONSE_SIZE;
unsigned int total_len;
struct kvec *iov = rqst->rq_iov;
int len, rc;
rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
(void **) &req, &total_len);
if (rc)
return rc;
switch (info_level) {
case SMB_FIND_FILE_DIRECTORY_INFO:
req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
break;
case SMB_FIND_FILE_ID_FULL_DIR_INFO:
req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
break;
case SMB_FIND_FILE_POSIX_INFO:
req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
break;
case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
req->FileInformationClass = FILE_FULL_DIRECTORY_INFORMATION;
break;
default:
cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
info_level);
return -EINVAL;
}
req->FileIndex = cpu_to_le32(index);
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
len = 0x2;
bufptr = req->Buffer;
memcpy(bufptr, &asteriks, len);
req->FileNameOffset =
cpu_to_le16(sizeof(struct smb2_query_directory_req));
req->FileNameLength = cpu_to_le16(len);
/*
* BB could be 30 bytes or so longer if we used SMB2 specific
* buffer lengths, but this is safe and close enough.
*/
output_size = min_t(unsigned int, output_size, server->maxBuf);
output_size = min_t(unsigned int, output_size, 2 << 15);
req->OutputBufferLength = cpu_to_le32(output_size);
iov[0].iov_base = (char *)req;
/* 1 for Buffer */
iov[0].iov_len = total_len - 1;
iov[1].iov_base = (char *)(req->Buffer);
iov[1].iov_len = len;
trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
tcon->ses->Suid, index, output_size);
return 0;
}
void SMB2_query_directory_free(struct smb_rqst *rqst)
{
if (rqst && rqst->rq_iov) {
cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
}
}
int
smb2_parse_query_directory(struct cifs_tcon *tcon,
struct kvec *rsp_iov,
int resp_buftype,
struct cifs_search_info *srch_inf)
{
struct smb2_query_directory_rsp *rsp;
size_t info_buf_size;
char *end_of_smb;
int rc;
rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
switch (srch_inf->info_level) {
case SMB_FIND_FILE_DIRECTORY_INFO:
info_buf_size = sizeof(FILE_DIRECTORY_INFO);
break;
case SMB_FIND_FILE_ID_FULL_DIR_INFO:
info_buf_size = sizeof(FILE_ID_FULL_DIR_INFO);
break;
case SMB_FIND_FILE_POSIX_INFO:
/* note that posix payload are variable size */
info_buf_size = sizeof(struct smb2_posix_info);
break;
case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO);
break;
default:
cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
srch_inf->info_level);
return -EINVAL;
}
rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
info_buf_size);
if (rc) {
cifs_tcon_dbg(VFS, "bad info payload");
return rc;
}
srch_inf->unicode = true;
if (srch_inf->ntwrk_buf_start) {
if (srch_inf->smallBuf)
cifs_small_buf_release(srch_inf->ntwrk_buf_start);
else
cifs_buf_release(srch_inf->ntwrk_buf_start);
}
srch_inf->ntwrk_buf_start = (char *)rsp;
srch_inf->srch_entries_start = srch_inf->last_entry =
(char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
end_of_smb = rsp_iov->iov_len + (char *)rsp;
srch_inf->entries_in_buffer = num_entries(
srch_inf->info_level,
srch_inf->srch_entries_start,
end_of_smb,
&srch_inf->last_entry,
info_buf_size);
srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
srch_inf->srch_entries_start, srch_inf->last_entry);
if (resp_buftype == CIFS_LARGE_BUFFER)
srch_inf->smallBuf = false;
else if (resp_buftype == CIFS_SMALL_BUFFER)
srch_inf->smallBuf = true;
else
cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
return 0;
}
int
SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, int index,
struct cifs_search_info *srch_inf)
{
struct smb_rqst rqst;
struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
struct smb2_query_directory_rsp *rsp = NULL;
int resp_buftype = CIFS_NO_BUFFER;
struct kvec rsp_iov;
int rc = 0;
struct cifs_ses *ses = tcon->ses;
struct TCP_Server_Info *server;
int flags = 0;
int retries = 0, cur_sleep = 0;
replay_again:
/* reinitialize for possible replay */
flags = 0;
server = cifs_pick_channel(ses);
if (!ses || !(ses->server))
return smb_EIO(smb_eio_trace_null_pointers);
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
memset(&rqst, 0, sizeof(struct smb_rqst));
memset(&iov, 0, sizeof(iov));
rqst.rq_iov = iov;
rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
rc = SMB2_query_directory_init(xid, tcon, server,
&rqst, persistent_fid,
volatile_fid, index,
srch_inf->info_level);
if (rc)
goto qdir_exit;
if (retries) {
/* Back-off before retry */
if (cur_sleep)
msleep(cur_sleep);
smb2_set_replay(server, &rqst);
}
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
if (rc) {
if (rc == -ENODATA &&
rsp->hdr.Status == STATUS_NO_MORE_FILES) {
trace_smb3_query_dir_done(xid, persistent_fid,
tcon->tid, tcon->ses->Suid, index, 0);
srch_inf->endOfSearch = true;
rc = 0;
} else {
trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
tcon->ses->Suid, index, 0, rc);
cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
}
goto qdir_exit;
}
rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
srch_inf);
if (rc) {
trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
tcon->ses->Suid, index, 0, rc);
goto qdir_exit;
}
resp_buftype = CIFS_NO_BUFFER;
trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
tcon->ses->Suid, index, srch_inf->entries_in_buffer);
qdir_exit:
SMB2_query_directory_free(&rqst);
free_rsp_buf(resp_buftype, rsp);
if (is_replayable_error(rc) &&
smb2_should_replay(tcon, &retries, &cur_sleep))
goto replay_again;
return rc;
}
int
SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
struct smb_rqst *rqst,
u64 persistent_fid, u64 volatile_fid, u32 pid,
u8 info_class, u8 info_type, u32 additional_info,
void **data, unsigned int *size)
{
struct smb2_set_info_req *req;
struct kvec *iov = rqst->rq_iov;
unsigned int i, total_len;
int rc;
rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
(void **) &req, &total_len);
if (rc)
return rc;
req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
req->InfoType = info_type;
req->FileInfoClass = info_class;
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
req->AdditionalInformation = cpu_to_le32(additional_info);
req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req));
req->BufferLength = cpu_to_le32(*size);
memcpy(req->Buffer, *data, *size);
total_len += *size;
iov[0].iov_base = (char *)req;
/* 1 for Buffer */
iov[0].iov_len = total_len - 1;
for (i = 1; i < rqst->rq_nvec; i++) {
le32_add_cpu(&req->BufferLength, size[i]);
iov[i].iov_base = (char *)data[i];
iov[i].iov_len = size[i];
}
return 0;
}
void
SMB2_set_info_free(struct smb_rqst *rqst)
{
if (rqst && rqst->rq_iov)
cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
}
static int
send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
u8 info_type, u32 additional_info, unsigned int num,
void **data, unsigned int *size)
{
struct smb_rqst rqst;
struct smb2_set_info_rsp *rsp = NULL;
struct kvec *iov;
struct kvec rsp_iov;
int rc = 0;
int resp_buftype;
struct cifs_ses *ses = tcon->ses;
struct TCP_Server_Info *server;
int flags = 0;
int retries = 0, cur_sleep = 0;
replay_again:
/* reinitialize for possible replay */
flags = 0;
server = cifs_pick_channel(ses);
if (!ses || !server)
return smb_EIO(smb_eio_trace_null_pointers);
if (!num)
return -EINVAL;
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
iov = kmalloc_objs(struct kvec, num);
if (!iov)
return -ENOMEM;
memset(&rqst, 0, sizeof(struct smb_rqst));
rqst.rq_iov = iov;
rqst.rq_nvec = num;
rc = SMB2_set_info_init(tcon, server,
&rqst, persistent_fid, volatile_fid, pid,
info_class, info_type, additional_info,
data, size);
if (rc) {
kfree(iov);
return rc;
}
if (retries) {
/* Back-off before retry */
if (cur_sleep)
msleep(cur_sleep);
smb2_set_replay(server, &rqst);
}
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags,
&rsp_iov);
SMB2_set_info_free(&rqst);
rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
if (rc != 0) {
cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
ses->Suid, info_class, (__u32)info_type, rc);
}
free_rsp_buf(resp_buftype, rsp);
kfree(iov);
if (is_replayable_error(rc) &&
smb2_should_replay(tcon, &retries, &cur_sleep))
goto replay_again;
return rc;
}
int
SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
u64 volatile_fid, u32 pid, loff_t new_eof)
{
struct smb2_file_eof_info info;
void *data;
unsigned int size;
info.EndOfFile = cpu_to_le64(new_eof);
data = &info;
size = sizeof(struct smb2_file_eof_info);
trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, new_eof);
return send_set_info(xid, tcon, persistent_fid, volatile_fid,
pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
0, 1, &data, &size);
}
int
SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid,
struct smb_ntsd *pnntsd, int pacllen, int aclflag)
{
return send_set_info(xid, tcon, persistent_fid, volatile_fid,
current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
1, (void **)&pnntsd, &pacllen);
}
int
SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid,
struct smb2_file_full_ea_info *buf, int len)
{
return send_set_info(xid, tcon, persistent_fid, volatile_fid,
current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
0, 1, (void **)&buf, &len);
}
int
SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
const u64 persistent_fid, const u64 volatile_fid,
__u8 oplock_level)
{
struct smb_rqst rqst;
int rc;
struct smb2_oplock_break *req = NULL;
struct cifs_ses *ses = tcon->ses;
struct TCP_Server_Info *server;
int flags = CIFS_OBREAK_OP;
unsigned int total_len;
struct kvec iov[1];
struct kvec rsp_iov;
int resp_buf_type;
int retries = 0, cur_sleep = 0;
replay_again:
/* reinitialize for possible replay */
flags = CIFS_OBREAK_OP;
server = cifs_pick_channel(ses);
cifs_dbg(FYI, "SMB2_oplock_break\n");
rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
(void **) &req, &total_len);
if (rc)
return rc;
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
req->VolatileFid = volatile_fid;
req->PersistentFid = persistent_fid;
req->OplockLevel = oplock_level;
req->hdr.CreditRequest = cpu_to_le16(1);
flags |= CIFS_NO_RSP_BUF;
iov[0].iov_base = (char *)req;
iov[0].iov_len = total_len;
memset(&rqst, 0, sizeof(struct smb_rqst));
rqst.rq_iov = iov;
rqst.rq_nvec = 1;
if (retries) {
/* Back-off before retry */
if (cur_sleep)
msleep(cur_sleep);
smb2_set_replay(server, &rqst);
}
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buf_type, flags, &rsp_iov);
cifs_small_buf_release(req);
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
}
if (is_replayable_error(rc) &&
smb2_should_replay(tcon, &retries, &cur_sleep))
goto replay_again;
return rc;
}
void
smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
struct kstatfs *kst)
{
kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
kst->f_bfree = kst->f_bavail =
le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
return;
}
static void
copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
struct kstatfs *kst)
{
kst->f_bsize = le32_to_cpu(response_data->BlockSize);
kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
kst->f_bfree = le64_to_cpu(response_data->BlocksAvail);
if (response_data->UserBlocksAvail == cpu_to_le64(-1))
kst->f_bavail = kst->f_bfree;
else
kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
if (response_data->TotalFileNodes != cpu_to_le64(-1))
kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
if (response_data->FreeFileNodes != cpu_to_le64(-1))
kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
return;
}
static int
build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
struct TCP_Server_Info *server,
int level, int outbuf_len, u64 persistent_fid,
u64 volatile_fid)
{
int rc;
struct smb2_query_info_req *req;
unsigned int total_len;
cifs_dbg(FYI, "Query FSInfo level %d\n", level);
if ((tcon->ses == NULL) || server == NULL)
return smb_EIO(smb_eio_trace_null_pointers);
rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
(void **) &req, &total_len);
if (rc)
return rc;
req->InfoType = SMB2_O_INFO_FILESYSTEM;
req->FileInfoClass = level;
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
/* 1 for pad */
req->InputBufferOffset =
cpu_to_le16(sizeof(struct smb2_query_info_req));
req->OutputBufferLength = cpu_to_le32(
outbuf_len + sizeof(struct smb2_query_info_rsp));
iov->iov_base = (char *)req;
iov->iov_len = total_len;
return 0;
}
static inline void free_qfs_info_req(struct kvec *iov)
{
cifs_buf_release(iov->iov_base);
}
int
SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
{
struct smb_rqst rqst;
struct smb2_query_info_rsp *rsp = NULL;
struct kvec iov;
struct kvec rsp_iov;
int rc = 0;
int resp_buftype;
struct cifs_ses *ses = tcon->ses;
struct TCP_Server_Info *server;
FILE_SYSTEM_POSIX_INFO *info = NULL;
int flags = 0;
int retries = 0, cur_sleep = 0;
replay_again:
/* reinitialize for possible replay */
flags = 0;
server = cifs_pick_channel(ses);
rc = build_qfs_info_req(&iov, tcon, server,
FS_POSIX_INFORMATION,
sizeof(FILE_SYSTEM_POSIX_INFO),
persistent_fid, volatile_fid);
if (rc)
return rc;
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
memset(&rqst, 0, sizeof(struct smb_rqst));
rqst.rq_iov = &iov;
rqst.rq_nvec = 1;
if (retries) {
/* Back-off before retry */
if (cur_sleep)
msleep(cur_sleep);
smb2_set_replay(server, &rqst);
}
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
free_qfs_info_req(&iov);
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
goto posix_qfsinf_exit;
}
rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
info = (FILE_SYSTEM_POSIX_INFO *)(
le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
sizeof(FILE_SYSTEM_POSIX_INFO));
if (!rc)
copy_posix_fs_info_to_kstatfs(info, fsdata);
posix_qfsinf_exit:
free_rsp_buf(resp_buftype, rsp_iov.iov_base);
if (is_replayable_error(rc) &&
smb2_should_replay(tcon, &retries, &cur_sleep))
goto replay_again;
return rc;
}
int
SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, int level)
{
struct smb_rqst rqst;
struct smb2_query_info_rsp *rsp = NULL;
struct kvec iov;
struct kvec rsp_iov;
int rc = 0;
int resp_buftype, max_len, min_len;
struct cifs_ses *ses = tcon->ses;
struct TCP_Server_Info *server;
unsigned int rsp_len, offset;
int flags = 0;
int retries = 0, cur_sleep = 0;
replay_again:
/* reinitialize for possible replay */
flags = 0;
server = cifs_pick_channel(ses);
if (level == FS_DEVICE_INFORMATION) {
max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
} else if (level == FS_ATTRIBUTE_INFORMATION) {
max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO) + MAX_FS_NAME_LEN;
min_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
} else if (level == FS_SECTOR_SIZE_INFORMATION) {
max_len = sizeof(struct smb3_fs_ss_info);
min_len = sizeof(struct smb3_fs_ss_info);
} else if (level == FS_VOLUME_INFORMATION) {
max_len = sizeof(struct filesystem_vol_info) + MAX_VOL_LABEL_LEN;
min_len = sizeof(struct filesystem_vol_info);
} else {
cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
return -EINVAL;
}
rc = build_qfs_info_req(&iov, tcon, server,
level, max_len,
persistent_fid, volatile_fid);
if (rc)
return rc;
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
memset(&rqst, 0, sizeof(struct smb_rqst));
rqst.rq_iov = &iov;
rqst.rq_nvec = 1;
if (retries) {
/* Back-off before retry */
if (cur_sleep)
msleep(cur_sleep);
smb2_set_replay(server, &rqst);
}
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
free_qfs_info_req(&iov);
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
goto qfsattr_exit;
}
rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
rsp_len = le32_to_cpu(rsp->OutputBufferLength);
offset = le16_to_cpu(rsp->OutputBufferOffset);
rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
if (rc)
goto qfsattr_exit;
if (level == FS_ATTRIBUTE_INFORMATION)
memcpy(&tcon->fsAttrInfo, offset
+ (char *)rsp, min_t(unsigned int,
rsp_len, min_len));
else if (level == FS_DEVICE_INFORMATION)
memcpy(&tcon->fsDevInfo, offset
+ (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
else if (level == FS_SECTOR_SIZE_INFORMATION) {
struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
(offset + (char *)rsp);
tcon->ss_flags = le32_to_cpu(ss_info->Flags);
tcon->perf_sector_size =
le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
} else if (level == FS_VOLUME_INFORMATION) {
struct filesystem_vol_info *vol_info = (struct filesystem_vol_info *)
(offset + (char *)rsp);
tcon->vol_serial_number = le32_to_cpu(vol_info->VolumeSerialNumber);
tcon->vol_create_time = vol_info->VolumeCreationTime;
}
qfsattr_exit:
free_rsp_buf(resp_buftype, rsp_iov.iov_base);
if (is_replayable_error(rc) &&
smb2_should_replay(tcon, &retries, &cur_sleep))
goto replay_again;
return rc;
}
int
smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
const __u32 num_lock, struct smb2_lock_element *buf)
{
struct smb_rqst rqst;
int rc = 0;
struct smb2_lock_req *req = NULL;
struct kvec iov[2];
struct kvec rsp_iov;
int resp_buf_type;
unsigned int count;
int flags = CIFS_NO_RSP_BUF;
unsigned int total_len;
struct TCP_Server_Info *server;
int retries = 0, cur_sleep = 0;
replay_again:
/* reinitialize for possible replay */
flags = CIFS_NO_RSP_BUF;
server = cifs_pick_channel(tcon->ses);
cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
(void **) &req, &total_len);
if (rc)
return rc;
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
req->LockCount = cpu_to_le16(num_lock);
req->PersistentFileId = persist_fid;
req->VolatileFileId = volatile_fid;
count = num_lock * sizeof(struct smb2_lock_element);
iov[0].iov_base = (char *)req;
iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
iov[1].iov_base = (char *)buf;
iov[1].iov_len = count;
cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
memset(&rqst, 0, sizeof(struct smb_rqst));
rqst.rq_iov = iov;
rqst.rq_nvec = 2;
if (retries) {
/* Back-off before retry */
if (cur_sleep)
msleep(cur_sleep);
smb2_set_replay(server, &rqst);
}
trace_smb3_lock_enter(xid, persist_fid, tcon->tid, tcon->ses->Suid,
le64_to_cpu(buf[0].Offset),
le64_to_cpu(buf[0].Length),
le32_to_cpu(buf[0].Flags), num_lock, 0);
rc = cifs_send_recv(xid, tcon->ses, server,
&rqst, &resp_buf_type, flags,
&rsp_iov);
cifs_small_buf_release(req);
if (rc) {
cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
trace_smb3_lock_err(xid, persist_fid, tcon->tid,
tcon->ses->Suid,
le64_to_cpu(buf[0].Offset),
le64_to_cpu(buf[0].Length),
le32_to_cpu(buf[0].Flags), num_lock, rc);
} else {
trace_smb3_lock_done(xid, persist_fid, tcon->tid, tcon->ses->Suid,
le64_to_cpu(buf[0].Offset),
le64_to_cpu(buf[0].Length),
le32_to_cpu(buf[0].Flags), num_lock, 0);
}
if (is_replayable_error(rc) &&
smb2_should_replay(tcon, &retries, &cur_sleep))
goto replay_again;
return rc;
}
int
SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
const __u64 length, const __u64 offset, const __u32 lock_flags,
const bool wait)
{
struct smb2_lock_element lock;
lock.Offset = cpu_to_le64(offset);
lock.Length = cpu_to_le64(length);
lock.Flags = cpu_to_le32(lock_flags);
if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
}
int
SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
__u8 *lease_key, const __le32 lease_state)
{
struct smb_rqst rqst;
int rc;
struct smb2_lease_ack *req = NULL;
struct cifs_ses *ses = tcon->ses;
int flags = CIFS_OBREAK_OP;
unsigned int total_len;
struct kvec iov[1];
struct kvec rsp_iov;
int resp_buf_type;
__u64 *please_key_high;
__u64 *please_key_low;
struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
cifs_dbg(FYI, "SMB2_lease_break\n");
rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
(void **) &req, &total_len);
if (rc)
return rc;
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
req->hdr.CreditRequest = cpu_to_le16(1);
req->StructureSize = cpu_to_le16(36);
total_len += 12;
memcpy(req->LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
req->LeaseState = lease_state;
flags |= CIFS_NO_RSP_BUF;
iov[0].iov_base = (char *)req;
iov[0].iov_len = total_len;
memset(&rqst, 0, sizeof(struct smb_rqst));
rqst.rq_iov = iov;
rqst.rq_nvec = 1;
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buf_type, flags, &rsp_iov);
cifs_small_buf_release(req);
please_key_low = (__u64 *)lease_key;
please_key_high = (__u64 *)(lease_key+8);
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
trace_smb3_lease_ack_err(le32_to_cpu(lease_state), tcon->tid,
ses->Suid, *please_key_low, *please_key_high, rc);
cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
} else
trace_smb3_lease_ack_done(le32_to_cpu(lease_state), tcon->tid,
ses->Suid, *please_key_low, *please_key_high);
return rc;
}