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linux/fs/cifs/smb2pdu.c
Steve French edb1613536 smb3: remove static checker warning 
Remove static checker warning pointed out by Dan Carpenter:

The patch feeaec621c09: "cifs: multichannel: move channel selection
above transport layer" from Apr 24, 2020, leads to the following
static checker warning:

        fs/cifs/smb2pdu.c:149 smb2_hdr_assemble()
        error: we previously assumed 'tcon->ses' could be null (see line 133)

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
CC: Aurelien Aptel <aptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
2020-06-04 13:50:55 -05:00

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/*
* fs/cifs/smb2pdu.c
*
* 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
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* 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 "smb2pdu.h"
#include "cifsglob.h"
#include "cifsacl.h"
#include "cifsproto.h"
#include "smb2proto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "ntlmssp.h"
#include "smb2status.h"
#include "smb2glob.h"
#include "cifspdu.h"
#include "cifs_spnego.h"
#include "smbdirect.h"
#include "trace.h"
#ifdef CONFIG_CIFS_DFS_UPCALL
#include "dfs_cache.h"
#endif
/*
* 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;
return 0;
}
static void
smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
const struct cifs_tcon *tcon,
struct TCP_Server_Info *server)
{
shdr->ProtocolId = SMB2_PROTO_NUMBER;
shdr->StructureSize = cpu_to_le16(64);
shdr->Command = smb2_cmd;
if (server) {
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->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->TreeId = tcon->tid;
/* Uid is not converted */
if (tcon->ses)
shdr->SessionId = 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;
}
#ifdef CONFIG_CIFS_DFS_UPCALL
static int __smb2_reconnect(const struct nls_table *nlsc,
struct cifs_tcon *tcon)
{
int rc;
struct TCP_Server_Info *server = tcon->ses->server;
struct dfs_cache_tgt_list tl;
struct dfs_cache_tgt_iterator *it = NULL;
char *tree;
const char *tcp_host;
size_t tcp_host_len;
const char *dfs_host;
size_t dfs_host_len;
tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
if (!tree)
return -ENOMEM;
if (!tcon->dfs_path) {
if (tcon->ipc) {
scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$",
server->hostname);
rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
} else {
rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon,
nlsc);
}
goto out;
}
rc = dfs_cache_noreq_find(tcon->dfs_path + 1, NULL, &tl);
if (rc)
goto out;
extract_unc_hostname(server->hostname, &tcp_host, &tcp_host_len);
for (it = dfs_cache_get_tgt_iterator(&tl); it;
it = dfs_cache_get_next_tgt(&tl, it)) {
const char *share, *prefix;
size_t share_len, prefix_len;
bool target_match;
rc = dfs_cache_get_tgt_share(it, &share, &share_len, &prefix,
&prefix_len);
if (rc) {
cifs_dbg(VFS, "%s: failed to parse target share %d\n",
__func__, rc);
continue;
}
extract_unc_hostname(share, &dfs_host, &dfs_host_len);
if (dfs_host_len != tcp_host_len
|| strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
cifs_dbg(FYI, "%s: %.*s doesn't match %.*s\n",
__func__,
(int)dfs_host_len, dfs_host,
(int)tcp_host_len, tcp_host);
rc = match_target_ip(server, dfs_host, dfs_host_len,
&target_match);
if (rc) {
cifs_dbg(VFS, "%s: failed to match target ip: %d\n",
__func__, rc);
break;
}
if (!target_match) {
cifs_dbg(FYI, "%s: skipping target\n", __func__);
continue;
}
}
if (tcon->ipc) {
scnprintf(tree, MAX_TREE_SIZE, "\\\\%.*s\\IPC$",
(int)share_len, share);
rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
} else {
scnprintf(tree, MAX_TREE_SIZE, "\\%.*s", (int)share_len,
share);
rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
if (!rc) {
rc = update_super_prepath(tcon, prefix,
prefix_len);
break;
}
}
if (rc == -EREMOTE)
break;
}
if (!rc) {
if (it)
rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1,
it);
else
rc = -ENOENT;
}
dfs_cache_free_tgts(&tl);
out:
kfree(tree);
return rc;
}
#else
static inline int __smb2_reconnect(const struct nls_table *nlsc,
struct cifs_tcon *tcon)
{
return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
}
#endif
static int
smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
struct TCP_Server_Info *server)
{
int rc;
struct nls_table *nls_codepage;
struct cifs_ses *ses;
int retries;
/*
* 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;
if (tcon->tidStatus == CifsExiting) {
/*
* only tree disconnect, open, and write,
* (and ulogoff which does not have tcon)
* are allowed as we start force umount.
*/
if ((smb2_command != SMB2_WRITE) &&
(smb2_command != SMB2_CREATE) &&
(smb2_command != SMB2_TREE_DISCONNECT)) {
cifs_dbg(FYI, "can not send cmd %d while umounting\n",
smb2_command);
return -ENODEV;
}
}
if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
(!tcon->ses->server) || !server)
return -EIO;
ses = tcon->ses;
retries = server->nr_targets;
/*
* Give demultiplex thread up to 10 seconds to each target available for
* reconnect -- should be greater than cifs socket timeout which is 7
* seconds.
*/
while (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:
return -EAGAIN;
}
rc = wait_event_interruptible_timeout(server->response_q,
(server->tcpStatus != CifsNeedReconnect),
10 * HZ);
if (rc < 0) {
cifs_dbg(FYI, "%s: aborting reconnect due to a received signal by the process\n",
__func__);
return -ERESTARTSYS;
}
/* are we still trying to reconnect? */
if (server->tcpStatus != CifsNeedReconnect)
break;
if (retries && --retries)
continue;
/*
* on "soft" mounts we wait once. Hard mounts keep
* retrying until process is killed or server comes
* back on-line
*/
if (!tcon->retry) {
cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
return -EHOSTDOWN;
}
retries = server->nr_targets;
}
if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
return 0;
nls_codepage = load_nls_default();
/*
* need to prevent multiple threads trying to simultaneously reconnect
* the same SMB session
*/
mutex_lock(&tcon->ses->session_mutex);
/*
* Recheck after acquire mutex. If another thread is negotiating
* and the server never sends an answer the socket will be closed
* and tcpStatus set to reconnect.
*/
if (server->tcpStatus == CifsNeedReconnect) {
rc = -EHOSTDOWN;
mutex_unlock(&tcon->ses->session_mutex);
goto out;
}
rc = cifs_negotiate_protocol(0, tcon->ses);
if (!rc && tcon->ses->need_reconnect) {
rc = cifs_setup_session(0, tcon->ses, nls_codepage);
if ((rc == -EACCES) && !tcon->retry) {
rc = -EHOSTDOWN;
mutex_unlock(&tcon->ses->session_mutex);
goto failed;
}
}
if (rc || !tcon->need_reconnect) {
mutex_unlock(&tcon->ses->session_mutex);
goto out;
}
cifs_mark_open_files_invalid(tcon);
if (tcon->use_persistent)
tcon->need_reopen_files = true;
rc = __smb2_reconnect(nls_codepage, tcon);
mutex_unlock(&tcon->ses->session_mutex);
cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
if (rc) {
/* If sess reconnected but tcon didn't, something strange ... */
pr_warn_once("reconnect tcon failed rc = %d\n", rc);
goto out;
}
if (smb2_command != SMB2_INTERNAL_CMD)
mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
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_IOCTL:
case SMB2_QUERY_DIRECTORY:
case SMB2_CHANGE_NOTIFY:
case SMB2_QUERY_INFO:
case SMB2_SET_INFO:
rc = -EAGAIN;
}
failed:
unload_nls(nls_codepage);
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_sync_pdu *spdu = (struct smb2_sync_pdu *)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->sync_hdr, smb2_command, tcon, server);
spdu->StructureSize2 = cpu_to_le16(parmsize);
*total_len = parmsize + sizeof(struct smb2_sync_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 */
if (smb2_command == SMB2_SET_INFO)
*request_buf = cifs_buf_get();
else
*request_buf = cifs_small_buf_get();
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_sync_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);
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 only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
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 void
build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
{
pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + two 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 DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
sizeof(struct smb2_neg_context), 8) * 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)
{
char *pneg_ctxt;
unsigned int ctxt_len;
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 = roundup(*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 = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
if (server->compress_algorithm) {
build_compression_ctxt((struct smb2_compression_capabilities_context *)
pneg_ctxt);
ctxt_len = DIV_ROUND_UP(
sizeof(struct smb2_compression_capabilities_context),
8) * 8;
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
req->NegotiateContextCount = cpu_to_le16(5);
} else
req->NegotiateContextCount = cpu_to_le16(4);
ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
server->hostname);
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
*total_len += sizeof(struct smb2_posix_neg_context);
}
static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
{
unsigned int len = le16_to_cpu(ctxt->DataLength);
/* If invalid preauth context warn but use what we requested, SHA-512 */
if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
pr_warn_once("server sent bad preauth context\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);
/* sizeof compress context is a one element compression capbility struct */
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;
}
if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
pr_warn_once("unknown compression algorithm\n");
return;
}
server->compress_algorithm = ctxt->CompressionAlgorithms[0];
}
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);
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 ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
(ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
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 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 == 0)
break;
if (len_of_ctxts < sizeof(struct smb2_neg_context))
break;
pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
clen = le16_to_cpu(pctx->DataLength);
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
cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
le16_to_cpu(pctx->ContextType));
if (rc)
break;
/* offsets must be 8 byte aligned */
clen = (clen + 7) & ~0x7;
offset += clen + sizeof(struct smb2_neg_context);
len_of_ctxts -= clen;
}
return rc;
}
static struct create_posix *
create_posix_buf(umode_t mode)
{
struct create_posix *buf;
buf = kzalloc(sizeof(struct create_posix),
GFP_KERNEL);
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)
{
struct smb2_create_req *req = iov[0].iov_base;
unsigned int num = *num_iovec;
iov[num].iov_base = create_posix_buf(mode);
if (mode == ACL_NO_MODE)
cifs_dbg(FYI, "Invalid mode\n");
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = sizeof(struct create_posix);
if (!req->CreateContextsOffset)
req->CreateContextsOffset = cpu_to_le32(
sizeof(struct smb2_create_req) +
iov[num - 1].iov_len);
le32_add_cpu(&req->CreateContextsLength, 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 smb_rqst rqst;
struct smb2_negotiate_req *req;
struct smb2_negotiate_rsp *rsp;
struct kvec iov[1];
struct kvec rsp_iov;
int rc = 0;
int resp_buftype;
struct TCP_Server_Info *server = cifs_ses_server(ses);
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 -EIO;
}
rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
(void **) &req, &total_len);
if (rc)
return rc;
req->sync_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->DialectCount = cpu_to_le16(2);
total_len += 4;
} 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);
/* 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,
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;
if (strcmp(server->vals->version_string,
SMB3ANY_VERSION_STRING) == 0) {
if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
cifs_server_dbg(VFS,
"SMB2 dialect returned but not requested\n");
return -EIO;
} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
cifs_server_dbg(VFS,
"SMB2.1 dialect returned but not requested\n");
return -EIO;
}
} else if (strcmp(server->vals->version_string,
SMBDEFAULT_VERSION_STRING) == 0) {
if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
cifs_server_dbg(VFS,
"SMB2 dialect returned but not requested\n");
return -EIO;
} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
/* ops set to 3.0 by default for default so update */
server->ops = &smb21_operations;
server->vals = &smb21_values;
} else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
server->ops = &smb311_operations;
server->vals = &smb311_values;
}
} else if (le16_to_cpu(rsp->DialectRevision) !=
server->vals->protocol_id) {
/* if requested single dialect ensure returned dialect matched */
cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
le16_to_cpu(rsp->DialectRevision));
return -EIO;
}
cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
else {
cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
le16_to_cpu(rsp->DialectRevision));
rc = -EIO;
goto neg_exit;
}
server->dialect = le16_to_cpu(rsp->DialectRevision);
/*
* 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;
security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
(struct smb2_sync_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 = -EIO;
}
if (rsp->DialectRevision == cpu_to_le16(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");
}
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(sizeof(*pneg_inbuf), GFP_NOFS);
if (!pneg_inbuf)
return -ENOMEM;
pneg_inbuf->Capabilities =
cpu_to_le32(server->vals->req_capabilities);
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->DialectCount = cpu_to_le16(2);
/* structure is big enough for 3 dialects, sending only 2 */
inbuflen = sizeof(*pneg_inbuf) -
(2 * 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 3 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 3 dialects, sending only 1 */
inbuflen = sizeof(*pneg_inbuf) -
sizeof(pneg_inbuf->Dialects[0]) * 2;
}
rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
(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 = -EIO;
goto out_free_inbuf;
}
rc = -EIO;
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))
goto out_free_rsp;
}
/* check validate negotiate info response matches what we got earlier */
if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
goto vneg_out;
if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
goto vneg_out;
/* do not validate server guid because not saved at negprot time yet */
if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
SMB2_LARGE_FILES) != 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) &&
(global_secflags & CIFSSEC_MAY_KRB5))
return Kerberos;
/* Fallthrough */
default:
return Unspecified;
}
}
struct SMB2_sess_data {
unsigned int xid;
struct cifs_ses *ses;
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 smb2_sess_setup_req *req;
struct TCP_Server_Info *server = cifs_ses_server(ses);
unsigned int total_len;
rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
(void **) &req,
&total_len);
if (rc)
return rc;
if (sess_data->ses->binding) {
req->sync_hdr.SessionId = sess_data->ses->Suid;
req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
req->PreviousSessionId = 0;
req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
} else {
/* First session, not a reauthenticate */
req->sync_hdr.SessionId = 0;
/*
* if reconnect, we need to send previous sess id
* otherwise it is 0
*/
req->PreviousSessionId = sess_data->previous_session;
req->Flags = 0; /* MBZ */
}
/* enough to enable echos and oplocks and one max size write */
req->sync_hdr.CreditRequest = cpu_to_le16(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)
{
free_rsp_buf(sess_data->buf0_type, sess_data->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) - 1 /* pad */);
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,
cifs_ses_server(sess_data->ses),
&rqst,
&sess_data->buf0_type,
CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
cifs_small_buf_release(sess_data->iov[0].iov_base);
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 = cifs_ses_server(ses);
mutex_lock(&server->srv_mutex);
if (server->ops->generate_signingkey) {
rc = server->ops->generate_signingkey(ses);
if (rc) {
cifs_dbg(FYI,
"SMB3 session key generation failed\n");
mutex_unlock(&server->srv_mutex);
return rc;
}
}
if (!server->session_estab) {
server->sequence_number = 0x2;
server->session_estab = true;
}
mutex_unlock(&server->srv_mutex);
cifs_dbg(FYI, "SMB2/3 session established successfully\n");
/* keep existing ses state if binding */
if (!ses->binding) {
spin_lock(&GlobalMid_Lock);
ses->status = CifsGood;
ses->need_reconnect = false;
spin_unlock(&GlobalMid_Lock);
}
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 cifs_spnego_msg *msg;
struct key *spnego_key = NULL;
struct smb2_sess_setup_rsp *rsp = NULL;
rc = SMB2_sess_alloc_buffer(sess_data);
if (rc)
goto out;
spnego_key = cifs_get_spnego_key(ses);
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;
}
/* keep session key if binding */
if (!ses->binding) {
ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
GFP_KERNEL);
if (!ses->auth_key.response) {
cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
msg->sesskey_len);
rc = -ENOMEM;
goto out_put_spnego_key;
}
ses->auth_key.len = 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 (!ses->binding) {
ses->Suid = rsp->sync_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);
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 smb2_sess_setup_rsp *rsp = NULL;
char *ntlmssp_blob = NULL;
bool use_spnego = false; /* else use raw ntlmssp */
u16 blob_length = 0;
/*
* If memory allocation is successful, caller of this function
* frees it.
*/
ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
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;
ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
GFP_KERNEL);
if (ntlmssp_blob == NULL) {
rc = -ENOMEM;
goto out;
}
build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
if (use_spnego) {
/* BB eventually need to add this */
cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
rc = -EOPNOTSUPP;
goto out;
} else {
blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
/* with raw NTLMSSP we don't encapsulate in SPNEGO */
}
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->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
rc = 0;
if (rc)
goto out;
if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
le16_to_cpu(rsp->SecurityBufferOffset)) {
cifs_dbg(VFS, "Invalid security buffer offset %d\n",
le16_to_cpu(rsp->SecurityBufferOffset));
rc = -EIO;
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");
/* keep existing ses id and flags if binding */
if (!ses->binding) {
ses->Suid = rsp->sync_hdr.SessionId;
ses->session_flags = le16_to_cpu(rsp->SessionFlags);
}
out:
kfree(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(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 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;
rc = SMB2_sess_alloc_buffer(sess_data);
if (rc)
goto out;
req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
req->sync_hdr.SessionId = ses->Suid;
rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
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;
/* keep existing ses id and flags if binding */
if (!ses->binding) {
ses->Suid = rsp->sync_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(ntlmssp_blob);
SMB2_sess_free_buffer(sess_data);
kfree(ses->ntlmssp);
ses->ntlmssp = NULL;
sess_data->result = rc;
sess_data->func = NULL;
}
static int
SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
{
int type;
type = smb2_select_sectype(cifs_ses_server(ses), 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,
const struct nls_table *nls_cp)
{
int rc = 0;
struct TCP_Server_Info *server = cifs_ses_server(ses);
struct SMB2_sess_data *sess_data;
cifs_dbg(FYI, "Session Setup\n");
if (!server) {
WARN(1, "%s: server is NULL!\n", __func__);
return -EIO;
}
sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
if (!sess_data)
return -ENOMEM;
rc = SMB2_select_sec(ses, sess_data);
if (rc)
goto out;
sess_data->xid = xid;
sess_data->ses = ses;
sess_data->buf0_type = CIFS_NO_BUFFER;
sess_data->nls_cp = (struct nls_table *) nls_cp;
sess_data->previous_session = ses->Suid;
/*
* 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(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))
server = ses->server;
else
return -EIO;
/* no need to send SMB logoff if uid already closed due to reconnect */
if (ses->need_reconnect)
goto smb2_session_already_dead;
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->sync_hdr.SessionId = ses->Suid;
if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
flags |= CIFS_TRANSFORM_REQ;
else if (server->sign)
req->sync_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;
/* always use master channel */
server = ses->server;
cifs_dbg(FYI, "TCON\n");
if (!server || !tree)
return -EIO;
unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
if (unc_path == NULL)
return -ENOMEM;
unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
unc_path_len *= 2;
if (unc_path_len < 2) {
kfree(unc_path);
return -EINVAL;
}
/* 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)
- 1 /* pad */);
req->PathLength = cpu_to_le16(unc_path_len - 2);
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->sync_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 */
req->sync_hdr.CreditRequest = cpu_to_le16(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) {
if (tcon) {
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->tidStatus = CifsGood;
tcon->need_reconnect = false;
tcon->tid = rsp->sync_hdr.TreeId;
strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
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);
tcon_exit:
free_rsp_buf(resp_buftype, rsp);
kfree(unc_path);
return rc;
tcon_error_exit:
if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
cifs_tcon_dbg(VFS, "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;
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 -EIO;
if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
return 0;
close_shroot_lease(&tcon->crfid);
rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->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, 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);
return rc;
}
static struct create_durable *
create_durable_buf(void)
{
struct create_durable *buf;
buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
if (!buf)
return NULL;
buf->ccontext.DataOffset = cpu_to_le16(offsetof
(struct create_durable, Data));
buf->ccontext.DataLength = cpu_to_le32(16);
buf->ccontext.NameOffset = cpu_to_le16(offsetof
(struct create_durable, 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 struct create_durable *
create_reconnect_durable_buf(struct cifs_fid *fid)
{
struct create_durable *buf;
buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
if (!buf)
return NULL;
buf->ccontext.DataOffset = cpu_to_le16(offsetof
(struct create_durable, Data));
buf->ccontext.DataLength = cpu_to_le32(16);
buf->ccontext.NameOffset = cpu_to_le16(offsetof
(struct create_durable, 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_on_disk_id *pdisk_id = (struct create_on_disk_id *)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);
}
void
smb2_parse_contexts(struct TCP_Server_Info *server,
struct smb2_create_rsp *rsp,
unsigned int *epoch, char *lease_key, __u8 *oplock,
struct smb2_file_all_info *buf,
struct create_posix_rsp *posix)
{
char *data_offset;
struct create_context *cc;
unsigned int next;
unsigned int remaining;
char *name;
const char smb3_create_tag_posix[] = {0x93, 0xAD, 0x25, 0x50, 0x9C,
0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
0xDE, 0x96, 0x8B, 0xCD, 0x7C};
*oplock = 0;
data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
remaining = le32_to_cpu(rsp->CreateContextsLength);
cc = (struct create_context *)data_offset;
/* Initialize inode number to 0 in case no valid data in qfid context */
if (buf)
buf->IndexNumber = 0;
while (remaining >= sizeof(struct create_context)) {
name = le16_to_cpu(cc->NameOffset) + (char *)cc;
if (le16_to_cpu(cc->NameLength) == 4 &&
strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
*oplock = server->ops->parse_lease_buf(cc, epoch,
lease_key);
else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
parse_query_id_ctxt(cc, buf);
else if ((le16_to_cpu(cc->NameLength) == 16)) {
if (posix &&
memcmp(name, smb3_create_tag_posix, 16) == 0)
parse_posix_ctxt(cc, buf, posix);
}
/* else {
cifs_dbg(FYI, "Context not matched with len %d\n",
le16_to_cpu(cc->NameLength));
cifs_dump_mem("Cctxt name: ", name, 4);
} */
next = le32_to_cpu(cc->Next);
if (!next)
break;
remaining -= next;
cc = (struct create_context *)((char *)cc + next);
}
if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
*oplock = rsp->OplockLevel;
return;
}
static int
add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
{
struct smb2_create_req *req = iov[0].iov_base;
unsigned int num = *num_iovec;
iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = server->vals->create_lease_size;
req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
if (!req->CreateContextsOffset)
req->CreateContextsOffset = cpu_to_le32(
sizeof(struct smb2_create_req) +
iov[num - 1].iov_len);
le32_add_cpu(&req->CreateContextsLength,
server->vals->create_lease_size);
*num_iovec = num + 1;
return 0;
}
static struct create_durable_v2 *
create_durable_v2_buf(struct cifs_open_parms *oparms)
{
struct cifs_fid *pfid = oparms->fid;
struct create_durable_v2 *buf;
buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
if (!buf)
return NULL;
buf->ccontext.DataOffset = cpu_to_le16(offsetof
(struct create_durable_v2, dcontext));
buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
buf->ccontext.NameOffset = cpu_to_le16(offsetof
(struct create_durable_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
* 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);
generate_random_uuid(buf->dcontext.CreateGuid);
memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 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(sizeof(struct create_durable_handle_reconnect_v2),
GFP_KERNEL);
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)
{
struct smb2_create_req *req = iov[0].iov_base;
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_v2);
if (!req->CreateContextsOffset)
req->CreateContextsOffset =
cpu_to_le32(sizeof(struct smb2_create_req) +
iov[1].iov_len);
le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_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)
{
struct smb2_create_req *req = iov[0].iov_base;
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);
if (!req->CreateContextsOffset)
req->CreateContextsOffset =
cpu_to_le32(sizeof(struct smb2_create_req) +
iov[1].iov_len);
le32_add_cpu(&req->CreateContextsLength,
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)
{
struct smb2_create_req *req = iov[0].iov_base;
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(struct create_durable);
if (!req->CreateContextsOffset)
req->CreateContextsOffset =
cpu_to_le32(sizeof(struct smb2_create_req) +
iov[1].iov_len);
le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
*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(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
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)
{
struct smb2_create_req *req = iov[0].iov_base;
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);
if (!req->CreateContextsOffset)
req->CreateContextsOffset = cpu_to_le32(
sizeof(struct smb2_create_req) +
iov[num - 1].iov_len);
le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
*num_iovec = num + 1;
return 0;
}
/* 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, unsigned int *len)
{
struct crt_sd_ctxt *buf;
struct cifs_ace *pace;
unsigned int sdlen, acelen;
*len = roundup(sizeof(struct crt_sd_ctxt) + sizeof(struct cifs_ace) * 2,
8);
buf = kzalloc(*len, GFP_KERNEL);
if (buf == NULL)
return buf;
sdlen = sizeof(struct smb3_sd) + sizeof(struct smb3_acl) +
2 * sizeof(struct cifs_ace);
buf->ccontext.DataOffset = cpu_to_le16(offsetof
(struct crt_sd_ctxt, sd));
buf->ccontext.DataLength = cpu_to_le32(sdlen);
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(sizeof(struct smb3_sd));
buf->acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
/* create one ACE to hold the mode embedded in reserved special SID */
pace = (struct cifs_ace *)(sizeof(struct crt_sd_ctxt) + (char *)buf);
acelen = setup_special_mode_ACE(pace, (__u64)mode);
/* and one more ACE to allow access for authenticated users */
pace = (struct cifs_ace *)(acelen + (sizeof(struct crt_sd_ctxt) +
(char *)buf));
acelen += setup_authusers_ACE(pace);
buf->acl.AclSize = cpu_to_le16(sizeof(struct cifs_acl) + acelen);
buf->acl.AceCount = cpu_to_le16(2);
return buf;
}
static int
add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
{
struct smb2_create_req *req = iov[0].iov_base;
unsigned int num = *num_iovec;
unsigned int len = 0;
iov[num].iov_base = create_sd_buf(mode, &len);
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = len;
if (!req->CreateContextsOffset)
req->CreateContextsOffset = cpu_to_le32(
sizeof(struct smb2_create_req) +
iov[num - 1].iov_len);
le32_add_cpu(&req->CreateContextsLength, 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(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
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)
{
struct smb2_create_req *req = iov[0].iov_base;
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);
if (!req->CreateContextsOffset)
req->CreateContextsOffset = cpu_to_le32(
sizeof(struct smb2_create_req) +
iov[num - 1].iov_len);
le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
*num_iovec = num + 1;
return 0;
}
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 between the treename and
* path
*/
*out_len = treename_len + 1 + path_len;
/*
* final path needs to be null-terminated UTF16 with a
* size aligned to 8
*/
*out_size = roundup((*out_len+1)*2, 8);
*out_path = kzalloc(*out_size, GFP_KERNEL);
if (!*out_path)
return -ENOMEM;
cp = load_nls_default();
cifs_strtoUTF16(*out_path, treename, treename_len, cp);
UniStrcat(*out_path, sep);
UniStrcat(*out_path, 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 = 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 = -EIO;
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->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
&name_len,
tcon->treeName, 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;
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, CREATE_NOT_FILE,
FILE_WRITE_ATTRIBUTES);
/* 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;
}
rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
ses->Suid, CREATE_NOT_FILE,
FILE_WRITE_ATTRIBUTES);
SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
/* Eventually save off posix specific response info and timestaps */
err_free_rsp_buf:
free_rsp_buf(resp_buftype, rsp);
kfree(pc_buf);
err_free_req:
cifs_small_buf_release(req);
err_free_path:
kfree(utf16_path);
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->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
&name_len,
tcon->treeName, 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 = uni_path_len;
if (copy_size % 8 != 0)
copy_size = roundup(copy_size, 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, iov, &n_iov,
oparms->fid->lease_key, oplock);
if (rc)
return rc;
}
if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
/* need to set Next field of lease context if we request it */
if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
struct create_context *ccontext =
(struct create_context *)iov[n_iov-1].iov_base;
ccontext->Next =
cpu_to_le32(server->vals->create_lease_size);
}
rc = add_durable_context(iov, &n_iov, oparms,
tcon->use_persistent);
if (rc)
return rc;
}
if (tcon->posix_extensions) {
if (n_iov > 2) {
struct create_context *ccontext =
(struct create_context *)iov[n_iov-1].iov_base;
ccontext->Next =
cpu_to_le32(iov[n_iov-1].iov_len);
}
rc = add_posix_context(iov, &n_iov, oparms->mode);
if (rc)
return rc;
}
if (tcon->snapshot_time) {
cifs_dbg(FYI, "adding snapshot context\n");
if (n_iov > 2) {
struct create_context *ccontext =
(struct create_context *)iov[n_iov-1].iov_base;
ccontext->Next =
cpu_to_le32(iov[n_iov-1].iov_len);
}
rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
if (rc)
return rc;
}
if ((oparms->disposition != FILE_OPEN) &&
(oparms->cifs_sb) &&
(oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
(oparms->mode != ACL_NO_MODE)) {
if (n_iov > 2) {
struct create_context *ccontext =
(struct create_context *)iov[n_iov-1].iov_base;
ccontext->Next =
cpu_to_le32(iov[n_iov-1].iov_len);
}
cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
rc = add_sd_context(iov, &n_iov, oparms->mode);
if (rc)
return rc;
}
if (n_iov > 2) {
struct create_context *ccontext =
(struct create_context *)iov[n_iov-1].iov_base;
ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
}
add_query_id_context(iov, &n_iov);
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 = cifs_pick_channel(ses);
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;
cifs_dbg(FYI, "create/open\n");
if (!ses || !server)
return -EIO;
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->create_options, oparms->desired_access);
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->treeName);
tcon->need_reconnect = true;
}
goto creat_exit;
} else
trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
ses->Suid, oparms->create_options,
oparms->desired_access);
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->sync_hdr.MessageId);
#endif /* CIFS_DEBUG2 */
if (buf) {
memcpy(buf, &rsp->CreationTime, 32);
buf->AllocationSize = rsp->AllocationSize;
buf->EndOfFile = rsp->EndofFile;
buf->Attributes = rsp->FileAttributes;
buf->NumberOfLinks = cpu_to_le32(1);
buf->DeletePending = 0;
}
smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
oparms->fid->lease_key, oplock, buf, posix);
creat_exit:
SMB2_open_free(&rqst);
free_rsp_buf(resp_buftype, rsp);
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,
bool is_fsctl, 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->sync_hdr.CreditCharge = cpu_to_le16(DIV_ROUND_UP(max_response_size, SMB2_MAX_BUFFER_SIZE));
if (is_fsctl)
req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
else
req->Flags = 0;
/* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
req->sync_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, bool is_fsctl,
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;
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 (!tcon)
return -EIO;
ses = tcon->ses;
if (!ses)
return -EIO;
server = cifs_pick_channel(ses);
if (!server)
return -EIO;
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,
is_fsctl, in_data, indatalen, max_out_data_len);
if (rc)
goto ioctl_exit;
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;
*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);
*plen = 0;
rc = -EIO;
goto ioctl_exit;
}
if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
le32_to_cpu(rsp->OutputOffset));
*plen = 0;
rc = -EIO;
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);
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, true /* is_fsctl */,
(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 = cifs_pick_channel(ses);
struct kvec iov[1];
struct kvec rsp_iov;
int resp_buftype = CIFS_NO_BUFFER;
int rc = 0;
int flags = 0;
bool query_attrs = false;
cifs_dbg(FYI, "Close\n");
if (!ses || !server)
return -EIO;
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;
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);
/*
* Note that have to subtract 4 since struct network_open_info
* has a final 4 byte pad that close response does not have
*/
if (pbuf)
memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
}
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 (rc == -EINTR) {
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);
}
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, buffer_length);
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;
int rc;
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 = total_len - 1 + input_len;
return 0;
}
void
SMB2_query_info_free(struct smb_rqst *rqst)
{
if (rqst && rqst->rq_iov)
cifs_small_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;
cifs_dbg(FYI, "Query Info\n");
if (!ses)
return -EIO;
server = cifs_pick_channel(ses);
if (!server)
return -EIO;
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);
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, 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);
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 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
*plen = 0;
return query_info(xid, tcon, persistent_fid, volatile_fid,
0, SMB2_O_INFO_SECURITY, additional_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)
{
struct cifs_ses *ses = tcon->ses;
struct TCP_Server_Info *server = cifs_pick_channel(ses);
struct smb_rqst rqst;
struct kvec iov[1];
struct kvec rsp_iov = {NULL, 0};
int resp_buftype = CIFS_NO_BUFFER;
int flags = 0;
int rc = 0;
cifs_dbg(FYI, "change notify\n");
if (!ses || !server)
return -EIO;
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_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);
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);
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);
return rc;
}
/*
* This is a no-op for now. We're not really interested in the reply, but
* rather in the fact that the server sent one and that server->lstrp
* gets updated.
*
* FIXME: maybe we should consider checking that the reply matches request?
*/
static void
smb2_echo_callback(struct mid_q_entry *mid)
{
struct TCP_Server_Info *server = mid->callback_data;
struct smb2_echo_rsp *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->sync_hdr.CreditRequest);
credits.instance = server->reconnect_instance;
}
DeleteMidQEntry(mid);
add_credits(server, &credits, CIFS_ECHO_OP);
}
void smb2_reconnect_server(struct work_struct *work)
{
struct TCP_Server_Info *server = container_of(work,
struct TCP_Server_Info, reconnect.work);
struct cifs_ses *ses;
struct cifs_tcon *tcon, *tcon2;
struct list_head tmp_list;
int tcon_exist = false;
int rc;
int resched = false;
/* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
mutex_lock(&server->reconnect_mutex);
INIT_LIST_HEAD(&tmp_list);
cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
spin_lock(&cifs_tcp_ses_lock);
list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
if (tcon->need_reconnect || tcon->need_reopen_files) {
tcon->tc_count++;
list_add_tail(&tcon->rlist, &tmp_list);
tcon_exist = 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_exist = true;
ses->ses_count++;
}
}
/*
* Get the reference to server struct to be sure that the last call of
* cifs_put_tcon() in the loop below won't release the server pointer.
*/
if (tcon_exist)
server->srv_count++;
spin_unlock(&cifs_tcp_ses_lock);
list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
if (!rc)
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);
}
cifs_dbg(FYI, "Reconnecting tcons finished\n");
if (resched)
queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
mutex_unlock(&server->reconnect_mutex);
/* now we can safely release srv struct */
if (tcon_exist)
cifs_put_tcp_session(server, 1);
}
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\n");
if (server->tcpStatus == CifsNeedNegotiate) {
/* No need to send echo on newly established connections */
mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
return rc;
}
rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
(void **)&req, &total_len);
if (rc)
return rc;
req->sync_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 = cifs_pick_channel(ses);
int resp_buftype = CIFS_NO_BUFFER;
int flags = 0;
int rc = 0;
cifs_dbg(FYI, "flush\n");
if (!ses || !(ses->server))
return -EIO;
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);
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);
return rc;
}
/*
* 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_readdata *rdata,
unsigned int remaining_bytes, int request_type)
{
int rc = -EACCES;
struct smb2_read_plain_req *req = NULL;
struct smb2_sync_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->sync_hdr;
shdr->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(0 /* 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 RDMA write, fill in and append
* smbd_buffer_descriptor_v1 to the end of read request
*/
if (server->rdma && rdata && !server->sign &&
rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
struct smbd_buffer_descriptor_v1 *v1;
bool need_invalidate = server->dialect == SMB30_PROT_ID;
rdata->mr = smbd_register_mr(
server->smbd_conn, rdata->pages,
rdata->nr_pages, rdata->page_offset,
rdata->tailsz, 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_plain_req, Buffer));
req->ReadChannelInfoLength =
cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
v1->offset = cpu_to_le64(rdata->mr->mr->iova);
v1->token = cpu_to_le32(rdata->mr->mr->rkey);
v1->length = cpu_to_le32(rdata->mr->mr->length);
*total_len += sizeof(*v1) - 1;
}
#endif
if (request_type & CHAINED_REQUEST) {
if (!(request_type & END_OF_CHAIN)) {
/* next 8-byte aligned request */
*total_len = DIV_ROUND_UP(*total_len, 8) * 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 = 0xFFFFFFFF;
shdr->TreeId = 0xFFFFFFFF;
req->PersistentFileId = 0xFFFFFFFF;
req->VolatileFileId = 0xFFFFFFFF;
}
}
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 mid_q_entry *mid)
{
struct cifs_readdata *rdata = mid->callback_data;
struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
struct TCP_Server_Info *server = rdata->server;
struct smb2_sync_hdr *shdr =
(struct smb2_sync_hdr *)rdata->iov[0].iov_base;
struct cifs_credits credits = { .value = 0, .instance = 0 };
struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
.rq_nvec = 1,
.rq_pages = rdata->pages,
.rq_offset = rdata->page_offset,
.rq_npages = rdata->nr_pages,
.rq_pagesz = rdata->pagesz,
.rq_tailsz = rdata->tailsz };
WARN_ONCE(rdata->server != mid->server,
"rdata server %p != mid server %p",
rdata->server, mid->server);
cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
__func__, mid->mid, mid->mid_state, rdata->result,
rdata->bytes);
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;
rc = smb2_verify_signature(&rqst, server);
if (rc)
cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
rc);
}
/* 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:
case MID_RETRY_NEEDED:
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:
credits.value = le16_to_cpu(shdr->CreditRequest);
credits.instance = server->reconnect_instance;
/* fall through */
default:
rdata->result = -EIO;
}
#ifdef CONFIG_CIFS_SMB_DIRECT
/*
* If this rdata has a memmory 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(0 /* xid */,
rdata->cfile->fid.persistent_fid,
tcon->tid, tcon->ses->Suid, rdata->offset,
rdata->bytes, rdata->result);
} else
trace_smb3_read_done(0 /* xid */,
rdata->cfile->fid.persistent_fid,
tcon->tid, tcon->ses->Suid,
rdata->offset, rdata->got_bytes);
queue_work(cifsiod_wq, &rdata->work);
DeleteMidQEntry(mid);
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_readdata *rdata)
{
int rc, flags = 0;
char *buf;
struct smb2_sync_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->cfile->tlink);
unsigned int total_len;
cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
__func__, rdata->offset, rdata->bytes);
if (!rdata->server)
rdata->server = cifs_pick_channel(tcon->ses);
io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
io_parms.server = server = rdata->server;
io_parms.offset = rdata->offset;
io_parms.length = rdata->bytes;
io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
io_parms.pid = rdata->pid;
rc = smb2_new_read_req(
(void **) &buf, &total_len, &io_parms, rdata, 0, 0);
if (rc)
return rc;
if (smb3_encryption_required(io_parms.tcon))
flags |= CIFS_TRANSFORM_REQ;
rdata->iov[0].iov_base = buf;
rdata->iov[0].iov_len = total_len;
shdr = (struct smb2_sync_hdr *)buf;
if (rdata->credits.value > 0) {
shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
SMB2_MAX_BUFFER_SIZE));
shdr->CreditRequest =
cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
rc = adjust_credits(server, &rdata->credits, rdata->bytes);
if (rc)
goto async_readv_out;
flags |= CIFS_HAS_CREDITS;
}
kref_get(&rdata->refcount);
rc = cifs_call_async(server, &rqst,
cifs_readv_receive, smb2_readv_callback,
smb3_handle_read_data, rdata, flags,
&rdata->credits);
if (rc) {
kref_put(&rdata->refcount, cifs_readdata_release);
cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
io_parms.tcon->tid,
io_parms.tcon->ses->Suid,
io_parms.offset, io_parms.length, rc);
}
async_readv_out:
cifs_small_buf_release(buf);
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_plain_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(xid, req->PersistentFileId,
io_parms->tcon->tid, ses->Suid,
io_parms->offset, io_parms->length,
rc);
} else
trace_smb3_read_done(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(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 = -EIO;
*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 mid_q_entry *mid)
{
struct cifs_writedata *wdata = mid->callback_data;
struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
struct TCP_Server_Info *server = wdata->server;
unsigned int written;
struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
struct cifs_credits credits = { .value = 0, .instance = 0 };
WARN_ONCE(wdata->server != mid->server,
"wdata server %p != mid server %p",
wdata->server, mid->server);
switch (mid->mid_state) {
case MID_RESPONSE_RECEIVED:
credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
credits.instance = server->reconnect_instance;
wdata->result = smb2_check_receive(mid, server, 0);
if (wdata->result != 0)
break;
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->bytes)
written &= 0xFFFF;
if (written < wdata->bytes)
wdata->result = -ENOSPC;
else
wdata->bytes = written;
break;
case MID_REQUEST_SUBMITTED:
case MID_RETRY_NEEDED:
wdata->result = -EAGAIN;
break;
case MID_RESPONSE_MALFORMED:
credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
credits.instance = server->reconnect_instance;
/* fall through */
default:
wdata->result = -EIO;
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 (wdata->result) {
cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
trace_smb3_write_err(0 /* no xid */,
wdata->cfile->fid.persistent_fid,
tcon->tid, tcon->ses->Suid, wdata->offset,
wdata->bytes, wdata->result);
if (wdata->result == -ENOSPC)
pr_warn_once("Out of space writing to %s\n",
tcon->treeName);
} else
trace_smb3_write_done(0 /* no xid */,
wdata->cfile->fid.persistent_fid,
tcon->tid, tcon->ses->Suid,
wdata->offset, wdata->bytes);
queue_work(cifsiod_wq, &wdata->work);
DeleteMidQEntry(mid);
add_credits(server, &credits, 0);
}
/* smb2_async_writev - send an async write, and set up mid to handle result */
int
smb2_async_writev(struct cifs_writedata *wdata,
void (*release)(struct kref *kref))
{
int rc = -EACCES, flags = 0;
struct smb2_write_req *req = NULL;
struct smb2_sync_hdr *shdr;
struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
struct TCP_Server_Info *server = wdata->server;
struct kvec iov[1];
struct smb_rqst rqst = { };
unsigned int total_len;
if (!wdata->server)
server = wdata->server = cifs_pick_channel(tcon->ses);
rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
(void **) &req, &total_len);
if (rc)
return rc;
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
shdr = (struct smb2_sync_hdr *)req;
shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
req->PersistentFileId = wdata->cfile->fid.persistent_fid;
req->VolatileFileId = wdata->cfile->fid.volatile_fid;
req->WriteChannelInfoOffset = 0;
req->WriteChannelInfoLength = 0;
req->Channel = 0;
req->Offset = cpu_to_le64(wdata->offset);
req->DataOffset = cpu_to_le16(
offsetof(struct smb2_write_req, Buffer));
req->RemainingBytes = 0;
trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
#ifdef CONFIG_CIFS_SMB_DIRECT
/*
* If we want to do a server RDMA read, fill in and append
* smbd_buffer_descriptor_v1 to the end of write request
*/
if (server->rdma && !server->sign && wdata->bytes >=
server->smbd_conn->rdma_readwrite_threshold) {
struct smbd_buffer_descriptor_v1 *v1;
bool need_invalidate = server->dialect == SMB30_PROT_ID;
wdata->mr = smbd_register_mr(
server->smbd_conn, wdata->pages,
wdata->nr_pages, wdata->page_offset,
wdata->tailsz, false, need_invalidate);
if (!wdata->mr) {
rc = -EAGAIN;
goto async_writev_out;
}
req->Length = 0;
req->DataOffset = 0;
if (wdata->nr_pages > 1)
req->RemainingBytes =
cpu_to_le32(
(wdata->nr_pages - 1) * wdata->pagesz -
wdata->page_offset + wdata->tailsz
);
else
req->RemainingBytes = cpu_to_le32(wdata->tailsz);
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 smbd_buffer_descriptor_v1));
v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
v1->offset = cpu_to_le64(wdata->mr->mr->iova);
v1->token = cpu_to_le32(wdata->mr->mr->rkey);
v1->length = cpu_to_le32(wdata->mr->mr->length);
}
#endif
iov[0].iov_len = total_len - 1;
iov[0].iov_base = (char *)req;
rqst.rq_iov = iov;
rqst.rq_nvec = 1;
rqst.rq_pages = wdata->pages;
rqst.rq_offset = wdata->page_offset;
rqst.rq_npages = wdata->nr_pages;
rqst.rq_pagesz = wdata->pagesz;
rqst.rq_tailsz = wdata->tailsz;
#ifdef CONFIG_CIFS_SMB_DIRECT
if (wdata->mr) {
iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
rqst.rq_npages = 0;
}
#endif
cifs_dbg(FYI, "async write at %llu %u bytes\n",
wdata->offset, wdata->bytes);
#ifdef CONFIG_CIFS_SMB_DIRECT
/* For RDMA read, I/O size is in RemainingBytes not in Length */
if (!wdata->mr)
req->Length = cpu_to_le32(wdata->bytes);
#else
req->Length = cpu_to_le32(wdata->bytes);
#endif
if (wdata->credits.value > 0) {
shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
SMB2_MAX_BUFFER_SIZE));
shdr->CreditRequest =
cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
rc = adjust_credits(server, &wdata->credits, wdata->bytes);
if (rc)
goto async_writev_out;
flags |= CIFS_HAS_CREDITS;
}
kref_get(&wdata->refcount);
rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
wdata, flags, &wdata->credits);
if (rc) {
trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
tcon->tid, tcon->ses->Suid, wdata->offset,
wdata->bytes, rc);
kref_put(&wdata->refcount, release);
cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
}
async_writev_out:
cifs_small_buf_release(req);
return 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;
*nbytes = 0;
if (n_vec < 1)
return rc;
if (!io_parms->server)
io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
server = io_parms->server;
if (server == NULL)
return -ECONNABORTED;
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->sync_hdr.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(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;
rqst.rq_nvec = n_vec + 1;
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(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);
trace_smb3_write_done(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);
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 sid_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;
sid_len = posix_info_sid_size(owner_sid, end);
if (sid_len < 0)
return -1;
total_len += sid_len;
/* check group sid */
group_sid = beg + total_len;
sid_len = posix_info_sid_size(group_sid, end);
if (sid_len < 0)
return -1;
total_len += sid_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,
posix_info_sid_size(owner_sid, end));
memcpy(&out->group, group_sid,
posix_info_sid_size(group_sid, end));
}
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;
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) - 1);
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) - 1;
break;
case SMB_FIND_FILE_ID_FULL_DIR_INFO:
info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
break;
case SMB_FIND_FILE_POSIX_INFO:
/* note that posix payload are variable size */
info_buf_size = sizeof(struct smb2_posix_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 = cifs_pick_channel(ses);
int flags = 0;
if (!ses || !(ses->server))
return -EIO;
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;
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->sync_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);
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->sync_hdr.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) - 1);
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 = cifs_pick_channel(ses);
int flags = 0;
if (!ses || !server)
return -EIO;
if (!num)
return -EINVAL;
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
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;
}
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);
return rc;
}
int
SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
u64 volatile_fid, u32 pid, __le64 *eof)
{
struct smb2_file_eof_info info;
void *data;
unsigned int size;
info.EndOfFile = *eof;
data = &info;
size = sizeof(struct smb2_file_eof_info);
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 cifs_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 = cifs_pick_channel(ses);
int flags = CIFS_OBREAK_OP;
unsigned int total_len;
struct kvec iov[1];
struct kvec rsp_iov;
int resp_buf_type;
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->sync_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;
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);
}
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 -EIO;
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) - 1);
req->OutputBufferLength = cpu_to_le32(
outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
iov->iov_base = (char *)req;
iov->iov_len = total_len;
return 0;
}
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 = cifs_pick_channel(ses);
FILE_SYSTEM_POSIX_INFO *info = NULL;
int flags = 0;
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;
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
cifs_small_buf_release(iov.iov_base);
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);
return rc;
}
int
SMB2_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 = cifs_pick_channel(ses);
struct smb2_fs_full_size_info *info = NULL;
int flags = 0;
rc = build_qfs_info_req(&iov, tcon, server,
FS_FULL_SIZE_INFORMATION,
sizeof(struct smb2_fs_full_size_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;
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
cifs_small_buf_release(iov.iov_base);
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
goto qfsinf_exit;
}
rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
info = (struct smb2_fs_full_size_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(struct smb2_fs_full_size_info));
if (!rc)
smb2_copy_fs_info_to_kstatfs(info, fsdata);
qfsinf_exit:
free_rsp_buf(resp_buftype, rsp_iov.iov_base);
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 = cifs_pick_channel(ses);
unsigned int rsp_len, offset;
int flags = 0;
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);
min_len = MIN_FS_ATTR_INFO_SIZE;
} 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 smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
min_len = sizeof(struct smb3_fs_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;
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
cifs_small_buf_release(iov.iov_base);
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, max_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 smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
(offset + (char *)rsp);
tcon->vol_serial_number = vol_info->VolumeSerialNumber;
tcon->vol_create_time = vol_info->VolumeCreationTime;
}
qfsattr_exit:
free_rsp_buf(resp_buftype, rsp_iov.iov_base);
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 = 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->sync_hdr.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;
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, rc);
}
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->sync_hdr.CreditRequest = cpu_to_le16(1);
req->StructureSize = cpu_to_le16(36);
total_len += 12;
memcpy(req->LeaseKey, lease_key, 16);
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_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_done(le32_to_cpu(lease_state), tcon->tid,
ses->Suid, *please_key_low, *please_key_high);
return rc;
}
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