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linux-sg2042/fs/cifs/cifsglob.h

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/*
* fs/cifs/cifsglob.h
*
* Copyright (C) International Business Machines Corp., 2002,2008
* Author(s): Steve French (sfrench@us.ibm.com)
* Jeremy Allison (jra@samba.org)
*
* 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.
*
*/
#ifndef _CIFS_GLOB_H
#define _CIFS_GLOB_H
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/inet.h>
#include <linux/slab.h>
#include <linux/mempool.h>
#include <linux/workqueue.h>
#include "cifs_fs_sb.h"
#include "cifsacl.h"
#include <crypto/internal/hash.h>
#include <linux/scatterlist.h>
#include <uapi/linux/cifs/cifs_mount.h>
#include "smb2pdu.h"
#define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
#define SMB_PATH_MAX 260
#define CIFS_PORT 445
#define RFC1001_PORT 139
/*
* The sizes of various internal tables and strings
*/
#define MAX_UID_INFO 16
#define MAX_SES_INFO 2
#define MAX_TCON_INFO 4
#define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1)
#define CIFS_MIN_RCV_POOL 4
#define MAX_REOPEN_ATT 5 /* these many maximum attempts to reopen a file */
/*
* default attribute cache timeout (jiffies)
*/
#define CIFS_DEF_ACTIMEO (1 * HZ)
/*
* max attribute cache timeout (jiffies) - 2^30
*/
#define CIFS_MAX_ACTIMEO (1 << 30)
/*
* Max persistent and resilient handle timeout (milliseconds).
* Windows durable max was 960000 (16 minutes)
*/
#define SMB3_MAX_HANDLE_TIMEOUT 960000
/*
* MAX_REQ is the maximum number of requests that WE will send
* on one socket concurrently.
*/
#define CIFS_MAX_REQ 32767
#define RFC1001_NAME_LEN 15
#define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
/* maximum length of ip addr as a string (including ipv6 and sctp) */
#define SERVER_NAME_LENGTH 80
#define SERVER_NAME_LEN_WITH_NULL (SERVER_NAME_LENGTH + 1)
/* echo interval in seconds */
#define SMB_ECHO_INTERVAL_MIN 1
#define SMB_ECHO_INTERVAL_MAX 600
#define SMB_ECHO_INTERVAL_DEFAULT 60
/* maximum number of PDUs in one compound */
#define MAX_COMPOUND 5
/*
* Default number of credits to keep available for SMB3.
* This value is chosen somewhat arbitrarily. The Windows client
* defaults to 128 credits, the Windows server allows clients up to
* 512 credits (or 8K for later versions), and the NetApp server
* does not limit clients at all. Choose a high enough default value
* such that the client shouldn't limit performance, but allow mount
* to override (until you approach 64K, where we limit credits to 65000
* to reduce possibility of seeing more server credit overflow bugs.
*/
#define SMB2_MAX_CREDITS_AVAILABLE 32000
#include "cifspdu.h"
#ifndef XATTR_DOS_ATTRIB
#define XATTR_DOS_ATTRIB "user.DOSATTRIB"
#endif
/*
* CIFS vfs client Status information (based on what we know.)
*/
/* associated with each tcp and smb session */
enum statusEnum {
CifsNew = 0,
CifsGood,
CifsExiting,
CifsNeedReconnect,
CifsNeedNegotiate
};
enum securityEnum {
Unspecified = 0, /* not specified */
LANMAN, /* Legacy LANMAN auth */
NTLM, /* Legacy NTLM012 auth with NTLM hash */
NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */
RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */
Kerberos, /* Kerberos via SPNEGO */
};
struct session_key {
unsigned int len;
char *response;
};
/* crypto security descriptor definition */
struct sdesc {
struct shash_desc shash;
char ctx[];
};
/* crypto hashing related structure/fields, not specific to a sec mech */
struct cifs_secmech {
struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
struct crypto_shash *md5; /* md5 hash function */
struct crypto_shash *hmacsha256; /* hmac-sha256 hash function */
struct crypto_shash *cmacaes; /* block-cipher based MAC function */
struct crypto_shash *sha512; /* sha512 hash function */
struct sdesc *sdeschmacmd5; /* ctxt to generate ntlmv2 hash, CR1 */
struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
struct sdesc *sdeschmacsha256; /* ctxt to generate smb2 signature */
struct sdesc *sdesccmacaes; /* ctxt to generate smb3 signature */
struct sdesc *sdescsha512; /* ctxt to generate smb3.11 signing key */
struct crypto_aead *ccmaesencrypt; /* smb3 encryption aead */
struct crypto_aead *ccmaesdecrypt; /* smb3 decryption aead */
};
/* per smb session structure/fields */
struct ntlmssp_auth {
bool sesskey_per_smbsess; /* whether session key is per smb session */
__u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
__u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
};
struct cifs_cred {
int uid;
int gid;
int mode;
int cecount;
struct cifs_sid osid;
struct cifs_sid gsid;
struct cifs_ntace *ntaces;
struct cifs_ace *aces;
};
/*
*****************************************************************
* Except the CIFS PDUs themselves all the
* globally interesting structs should go here
*****************************************************************
*/
/*
* A smb_rqst represents a complete request to be issued to a server. It's
* formed by a kvec array, followed by an array of pages. Page data is assumed
* to start at the beginning of the first page.
*/
struct smb_rqst {
struct kvec *rq_iov; /* array of kvecs */
unsigned int rq_nvec; /* number of kvecs in array */
struct page **rq_pages; /* pointer to array of page ptrs */
unsigned int rq_offset; /* the offset to the 1st page */
unsigned int rq_npages; /* number pages in array */
unsigned int rq_pagesz; /* page size to use */
unsigned int rq_tailsz; /* length of last page */
};
struct mid_q_entry;
struct TCP_Server_Info;
struct cifsFileInfo;
struct cifs_ses;
struct cifs_tcon;
struct dfs_info3_param;
struct cifs_fattr;
struct smb3_fs_context;
struct cifs_fid;
struct cifs_readdata;
struct cifs_writedata;
struct cifs_io_parms;
struct cifs_search_info;
struct cifsInodeInfo;
struct cifs_open_parms;
struct cifs_credits;
struct smb_version_operations {
int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
struct mid_q_entry *);
bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
/* setup request: allocate mid, sign message */
struct mid_q_entry *(*setup_request)(struct cifs_ses *,
struct TCP_Server_Info *,
struct smb_rqst *);
/* setup async request: allocate mid, sign message */
struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
struct smb_rqst *);
/* check response: verify signature, map error */
int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
bool);
void (*add_credits)(struct TCP_Server_Info *server,
const struct cifs_credits *credits,
const int optype);
void (*set_credits)(struct TCP_Server_Info *, const int);
int * (*get_credits_field)(struct TCP_Server_Info *, const int);
unsigned int (*get_credits)(struct mid_q_entry *);
__u64 (*get_next_mid)(struct TCP_Server_Info *);
void (*revert_current_mid)(struct TCP_Server_Info *server,
const unsigned int val);
/* data offset from read response message */
unsigned int (*read_data_offset)(char *);
/*
* Data length from read response message
* When in_remaining is true, the returned data length is in
* message field DataRemaining for out-of-band data read (e.g through
* Memory Registration RDMA write in SMBD).
* Otherwise, the returned data length is in message field DataLength.
*/
unsigned int (*read_data_length)(char *, bool in_remaining);
/* map smb to linux error */
int (*map_error)(char *, bool);
/* find mid corresponding to the response message */
struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info);
void (*clear_stats)(struct cifs_tcon *);
void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
/* verify the message */
int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *);
void (*downgrade_oplock)(struct TCP_Server_Info *server,
struct cifsInodeInfo *cinode, __u32 oplock,
unsigned int epoch, bool *purge_cache);
/* process transaction2 response */
bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
char *, int);
/* check if we need to negotiate */
bool (*need_neg)(struct TCP_Server_Info *);
/* negotiate to the server */
int (*negotiate)(const unsigned int, struct cifs_ses *);
/* set negotiated write size */
unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
/* set negotiated read size */
unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
/* setup smb sessionn */
int (*sess_setup)(const unsigned int, struct cifs_ses *,
const struct nls_table *);
/* close smb session */
int (*logoff)(const unsigned int, struct cifs_ses *);
/* connect to a server share */
int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
struct cifs_tcon *, const struct nls_table *);
/* close tree connecion */
int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
/* get DFS referrals */
int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
const char *, struct dfs_info3_param **,
unsigned int *, const struct nls_table *, int);
/* informational QFS call */
void (*qfs_tcon)(const unsigned int, struct cifs_tcon *,
struct cifs_sb_info *);
/* check if a path is accessible or not */
int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
struct cifs_sb_info *, const char *);
/* query path data from the server */
int (*query_path_info)(const unsigned int, struct cifs_tcon *,
struct cifs_sb_info *, const char *,
FILE_ALL_INFO *, bool *, bool *);
/* query file data from the server */
int (*query_file_info)(const unsigned int, struct cifs_tcon *,
struct cifs_fid *, FILE_ALL_INFO *);
/* query reparse tag from srv to determine which type of special file */
int (*query_reparse_tag)(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const char *path,
__u32 *reparse_tag);
/* get server index number */
int (*get_srv_inum)(const unsigned int, struct cifs_tcon *,
struct cifs_sb_info *, const char *,
u64 *uniqueid, FILE_ALL_INFO *);
/* set size by path */
int (*set_path_size)(const unsigned int, struct cifs_tcon *,
const char *, __u64, struct cifs_sb_info *, bool);
/* set size by file handle */
int (*set_file_size)(const unsigned int, struct cifs_tcon *,
struct cifsFileInfo *, __u64, bool);
/* set attributes */
int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
const unsigned int);
int (*set_compression)(const unsigned int, struct cifs_tcon *,
struct cifsFileInfo *);
/* check if we can send an echo or nor */
bool (*can_echo)(struct TCP_Server_Info *);
/* send echo request */
int (*echo)(struct TCP_Server_Info *);
/* create directory */
int (*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);
int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode,
struct cifs_tcon *tcon, const char *name,
struct cifs_sb_info *sb);
/* set info on created directory */
void (*mkdir_setinfo)(struct inode *, const char *,
struct cifs_sb_info *, struct cifs_tcon *,
const unsigned int);
/* remove directory */
int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
struct cifs_sb_info *);
/* unlink file */
int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
struct cifs_sb_info *);
/* open, rename and delete file */
int (*rename_pending_delete)(const char *, struct dentry *,
const unsigned int);
/* send rename request */
int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
const char *, struct cifs_sb_info *);
/* send create hardlink request */
int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
const char *, const char *,
struct cifs_sb_info *);
/* query symlink target */
int (*query_symlink)(const unsigned int, struct cifs_tcon *,
struct cifs_sb_info *, const char *,
char **, bool);
/* open a file for non-posix mounts */
int (*open)(const unsigned int, struct cifs_open_parms *,
__u32 *, FILE_ALL_INFO *);
/* set fid protocol-specific info */
void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
/* close a file */
void (*close)(const unsigned int, struct cifs_tcon *,
struct cifs_fid *);
/* close a file, returning file attributes and timestamps */
void (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon,
struct cifsFileInfo *pfile_info);
/* send a flush request to the server */
int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
/* async read from the server */
int (*async_readv)(struct cifs_readdata *);
/* async write to the server */
int (*async_writev)(struct cifs_writedata *,
void (*release)(struct kref *));
/* sync read from the server */
int (*sync_read)(const unsigned int, struct cifs_fid *,
struct cifs_io_parms *, unsigned int *, char **,
int *);
/* sync write to the server */
int (*sync_write)(const unsigned int, struct cifs_fid *,
struct cifs_io_parms *, unsigned int *, struct kvec *,
unsigned long);
/* open dir, start readdir */
int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
const char *, struct cifs_sb_info *,
struct cifs_fid *, __u16,
struct cifs_search_info *);
/* continue readdir */
int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
struct cifs_fid *,
__u16, struct cifs_search_info *srch_inf);
/* close dir */
int (*close_dir)(const unsigned int, struct cifs_tcon *,
struct cifs_fid *);
/* calculate a size of SMB message */
unsigned int (*calc_smb_size)(void *buf, struct TCP_Server_Info *ptcpi);
/* check for STATUS_PENDING and process the response if yes */
bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server);
/* check for STATUS_NETWORK_SESSION_EXPIRED */
bool (*is_session_expired)(char *);
/* send oplock break response */
int (*oplock_response)(struct cifs_tcon *, struct cifs_fid *,
struct cifsInodeInfo *);
/* query remote filesystem */
int (*queryfs)(const unsigned int, struct cifs_tcon *,
struct cifs_sb_info *, struct kstatfs *);
/* send mandatory brlock to the server */
int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
__u64, __u32, int, int, bool);
/* unlock range of mandatory locks */
int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
const unsigned int);
/* push brlocks from the cache to the server */
int (*push_mand_locks)(struct cifsFileInfo *);
/* get lease key of the inode */
void (*get_lease_key)(struct inode *, struct cifs_fid *);
/* set lease key of the inode */
void (*set_lease_key)(struct inode *, struct cifs_fid *);
/* generate new lease key */
void (*new_lease_key)(struct cifs_fid *);
int (*generate_signingkey)(struct cifs_ses *);
int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *,
bool allocate_crypto);
int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
struct cifsFileInfo *src_file);
int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
struct cifsFileInfo *src_file, void __user *);
int (*notify)(const unsigned int xid, struct file *pfile,
void __user *pbuf);
int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
struct cifs_sb_info *, const unsigned char *,
char *, unsigned int *);
int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
struct cifs_sb_info *, const unsigned char *,
char *, unsigned int *);
/* if we can do cache read operations */
bool (*is_read_op)(__u32);
/* set oplock level for the inode */
void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
bool *);
/* create lease context buffer for CREATE request */
char * (*create_lease_buf)(u8 *lease_key, u8 oplock);
/* parse lease context buffer and return oplock/epoch info */
__u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey);
ssize_t (*copychunk_range)(const unsigned int,
struct cifsFileInfo *src_file,
struct cifsFileInfo *target_file,
u64 src_off, u64 len, u64 dest_off);
int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
struct cifsFileInfo *target_file, u64 src_off, u64 len,
u64 dest_off);
int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
const unsigned char *, const unsigned char *, char *,
size_t, struct cifs_sb_info *);
int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
const char *, const void *, const __u16,
const struct nls_table *, struct cifs_sb_info *);
struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
const char *, u32 *, u32);
struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
const struct cifs_fid *, u32 *, u32);
int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
int);
/* writepages retry size */
unsigned int (*wp_retry_size)(struct inode *);
/* get mtu credits */
int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
unsigned int *, struct cifs_credits *);
/* adjust previously taken mtu credits to request size */
int (*adjust_credits)(struct TCP_Server_Info *server,
struct cifs_credits *credits,
const unsigned int payload_size);
/* check if we need to issue closedir */
bool (*dir_needs_close)(struct cifsFileInfo *);
long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
loff_t);
/* init transform request - used for encryption for now */
int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst,
struct smb_rqst *, struct smb_rqst *);
int (*is_transform_hdr)(void *buf);
int (*receive_transform)(struct TCP_Server_Info *,
struct mid_q_entry **, char **, int *);
enum securityEnum (*select_sectype)(struct TCP_Server_Info *,
enum securityEnum);
int (*next_header)(char *);
/* ioctl passthrough for query_info */
int (*ioctl_query_info)(const unsigned int xid,
struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
__le16 *path, int is_dir,
unsigned long p);
/* make unix special files (block, char, fifo, socket) */
int (*make_node)(unsigned int xid,
struct inode *inode,
struct dentry *dentry,
struct cifs_tcon *tcon,
const char *full_path,
umode_t mode,
dev_t device_number);
/* version specific fiemap implementation */
int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *,
struct fiemap_extent_info *, u64, u64);
/* version specific llseek implementation */
loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int);
/* Check for STATUS_IO_TIMEOUT */
bool (*is_status_io_timeout)(char *buf);
/* Check for STATUS_NETWORK_NAME_DELETED */
void (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv);
};
struct smb_version_values {
char *version_string;
__u16 protocol_id;
__u32 req_capabilities;
__u32 large_lock_type;
__u32 exclusive_lock_type;
__u32 shared_lock_type;
__u32 unlock_lock_type;
size_t header_preamble_size;
size_t header_size;
size_t max_header_size;
size_t read_rsp_size;
__le16 lock_cmd;
unsigned int cap_unix;
unsigned int cap_nt_find;
unsigned int cap_large_files;
__u16 signing_enabled;
__u16 signing_required;
size_t create_lease_size;
};
#define HEADER_SIZE(server) (server->vals->header_size)
#define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
/**
* CIFS superblock mount flags (mnt_cifs_flags) to consider when
* trying to reuse existing superblock for a new mount
*/
#define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
CIFS_MOUNT_MAP_SFM_CHR | \
CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \
CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \
CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \
CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE)
/**
* Generic VFS superblock mount flags (s_flags) to consider when
* trying to reuse existing superblock for a new mount
*/
#define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \
SB_NODEV | SB_SYNCHRONOUS)
struct cifs_mnt_data {
struct cifs_sb_info *cifs_sb;
struct smb3_fs_context *ctx;
int flags;
};
static inline unsigned int
get_rfc1002_length(void *buf)
{
return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
}
static inline void
inc_rfc1001_len(void *buf, int count)
{
be32_add_cpu((__be32 *)buf, count);
}
struct TCP_Server_Info {
struct list_head tcp_ses_list;
struct list_head smb_ses_list;
__u64 conn_id; /* connection identifier (useful for debugging) */
int srv_count; /* reference counter */
/* 15 character server name + 0x20 16th byte indicating type = srv */
char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
struct smb_version_operations *ops;
struct smb_version_values *vals;
enum statusEnum tcpStatus; /* what we think the status is */
char *hostname; /* hostname portion of UNC string */
struct socket *ssocket;
struct sockaddr_storage dstaddr;
struct sockaddr_storage srcaddr; /* locally bind to this IP */
#ifdef CONFIG_NET_NS
struct net *net;
#endif
wait_queue_head_t response_q;
wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
struct list_head pending_mid_q;
bool noblocksnd; /* use blocking sendmsg */
bool noautotune; /* do not autotune send buf sizes */
bool tcp_nodelay;
unsigned int credits; /* send no more requests at once */
unsigned int max_credits; /* can override large 32000 default at mnt */
unsigned int in_flight; /* number of requests on the wire to server */
unsigned int max_in_flight; /* max number of requests that were on wire */
spinlock_t req_lock; /* protect the two values above */
struct mutex srv_mutex;
struct task_struct *tsk;
char server_GUID[16];
__u16 sec_mode;
bool sign; /* is signing enabled on this connection? */
bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */
bool session_estab; /* mark when very first sess is established */
int echo_credits; /* echo reserved slots */
int oplock_credits; /* oplock break reserved slots */
bool echoes:1; /* enable echoes */
__u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
u16 dialect; /* dialect index that server chose */
bool oplocks:1; /* enable oplocks */
unsigned int maxReq; /* Clients should submit no more */
/* than maxReq distinct unanswered SMBs to the server when using */
/* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */
unsigned int maxBuf; /* maxBuf specifies the maximum */
/* message size the server can send or receive for non-raw SMBs */
/* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
/* when socket is setup (and during reconnect) before NegProt sent */
unsigned int max_rw; /* maxRw specifies the maximum */
/* message size the server can send or receive for */
/* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
unsigned int capabilities; /* selective disabling of caps by smb sess */
int timeAdj; /* Adjust for difference in server time zone in sec */
__u64 CurrentMid; /* multiplex id - rotating counter */
char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
/* 16th byte of RFC1001 workstation name is always null */
char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
__u32 sequence_number; /* for signing, protected by srv_mutex */
__u32 reconnect_instance; /* incremented on each reconnect */
struct session_key session_key;
unsigned long lstrp; /* when we got last response from this server */
struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
#define CIFS_NEGFLAVOR_LANMAN 0 /* wct == 13, LANMAN */
#define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */
#define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */
char negflavor; /* NEGOTIATE response flavor */
/* extended security flavors that server supports */
bool sec_ntlmssp; /* supports NTLMSSP */
bool sec_kerberosu2u; /* supports U2U Kerberos */
bool sec_kerberos; /* supports plain Kerberos */
bool sec_mskerberos; /* supports legacy MS Kerberos */
bool large_buf; /* is current buffer large? */
/* use SMBD connection instead of socket */
bool rdma;
/* point to the SMBD connection if RDMA is used instead of socket */
struct smbd_connection *smbd_conn;
struct delayed_work echo; /* echo ping workqueue job */
char *smallbuf; /* pointer to current "small" buffer */
char *bigbuf; /* pointer to current "big" buffer */
/* Total size of this PDU. Only valid from cifs_demultiplex_thread */
unsigned int pdu_size;
unsigned int total_read; /* total amount of data read in this pass */
atomic_t in_send; /* requests trying to send */
atomic_t num_waiters; /* blocked waiting to get in sendrecv */
#ifdef CONFIG_CIFS_FSCACHE
struct fscache_cookie *fscache; /* client index cache cookie */
#endif
#ifdef CONFIG_CIFS_STATS2
atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */
atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */
__u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */
__u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS];
__u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS];
#endif /* STATS2 */
unsigned int max_read;
unsigned int max_write;
unsigned int min_offload;
__le16 compress_algorithm;
__le16 cipher_type;
/* save initital negprot hash */
__u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
bool posix_ext_supported;
struct delayed_work reconnect; /* reconnect workqueue job */
struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
unsigned long echo_interval;
/*
* Number of targets available for reconnect. The more targets
* the more tasks have to wait to let the demultiplex thread
* reconnect.
*/
int nr_targets;
bool noblockcnt; /* use non-blocking connect() */
bool is_channel; /* if a session channel */
#ifdef CONFIG_CIFS_SWN_UPCALL
bool use_swn_dstaddr;
struct sockaddr_storage swn_dstaddr;
#endif
};
struct cifs_credits {
unsigned int value;
unsigned int instance;
};
static inline unsigned int
in_flight(struct TCP_Server_Info *server)
{
unsigned int num;
spin_lock(&server->req_lock);
num = server->in_flight;
spin_unlock(&server->req_lock);
return num;
}
static inline bool
has_credits(struct TCP_Server_Info *server, int *credits, int num_credits)
{
int num;
spin_lock(&server->req_lock);
num = *credits;
spin_unlock(&server->req_lock);
return num >= num_credits;
}
static inline void
add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits,
const int optype)
{
server->ops->add_credits(server, credits, optype);
}
static inline void
add_credits_and_wake_if(struct TCP_Server_Info *server,
const struct cifs_credits *credits, const int optype)
{
if (credits->value) {
server->ops->add_credits(server, credits, optype);
wake_up(&server->request_q);
}
}
static inline void
set_credits(struct TCP_Server_Info *server, const int val)
{
server->ops->set_credits(server, val);
}
static inline int
adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits,
const unsigned int payload_size)
{
return server->ops->adjust_credits ?
server->ops->adjust_credits(server, credits, payload_size) : 0;
}
static inline __le64
get_next_mid64(struct TCP_Server_Info *server)
{
return cpu_to_le64(server->ops->get_next_mid(server));
}
static inline __le16
get_next_mid(struct TCP_Server_Info *server)
{
__u16 mid = server->ops->get_next_mid(server);
/*
* The value in the SMB header should be little endian for easy
* on-the-wire decoding.
*/
return cpu_to_le16(mid);
}
static inline void
revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
{
if (server->ops->revert_current_mid)
server->ops->revert_current_mid(server, val);
}
static inline void
revert_current_mid_from_hdr(struct TCP_Server_Info *server,
const struct smb2_sync_hdr *shdr)
{
unsigned int num = le16_to_cpu(shdr->CreditCharge);
return revert_current_mid(server, num > 0 ? num : 1);
}
static inline __u16
get_mid(const struct smb_hdr *smb)
{
return le16_to_cpu(smb->Mid);
}
static inline bool
compare_mid(__u16 mid, const struct smb_hdr *smb)
{
return mid == le16_to_cpu(smb->Mid);
}
/*
* When the server supports very large reads and writes via POSIX extensions,
* we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
* including the RFC1001 length.
*
* Note that this might make for "interesting" allocation problems during
* writeback however as we have to allocate an array of pointers for the
* pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
*
* For reads, there is a similar problem as we need to allocate an array
* of kvecs to handle the receive, though that should only need to be done
* once.
*/
#define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
#define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
/*
* When the server doesn't allow large posix writes, only allow a rsize/wsize
* of 2^17-1 minus the size of the call header. That allows for a read or
* write up to the maximum size described by RFC1002.
*/
#define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
#define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
/*
* The default wsize is 1M. find_get_pages seems to return a maximum of 256
* pages in a single call. With PAGE_SIZE == 4k, this means we can fill
* a single wsize request with a single call.
*/
#define CIFS_DEFAULT_IOSIZE (1024 * 1024)
#define SMB3_DEFAULT_IOSIZE (4 * 1024 * 1024)
/*
* Windows only supports a max of 60kb reads and 65535 byte writes. Default to
* those values when posix extensions aren't in force. In actuality here, we
* use 65536 to allow for a write that is a multiple of 4k. Most servers seem
* to be ok with the extra byte even though Windows doesn't send writes that
* are that large.
*
* Citation:
*
* https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
*/
#define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
#define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
/*
* Macros to allow the TCP_Server_Info->net field and related code to drop out
* when CONFIG_NET_NS isn't set.
*/
#ifdef CONFIG_NET_NS
static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
{
return srv->net;
}
static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
{
srv->net = net;
}
#else
static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
{
return &init_net;
}
static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
{
}
#endif
struct cifs_server_iface {
size_t speed;
unsigned int rdma_capable : 1;
unsigned int rss_capable : 1;
struct sockaddr_storage sockaddr;
};
struct cifs_chan {
struct TCP_Server_Info *server;
__u8 signkey[SMB3_SIGN_KEY_SIZE];
};
/*
* Session structure. One of these for each uid session with a particular host
*/
struct cifs_ses {
struct list_head smb_ses_list;
struct list_head tcon_list;
struct cifs_tcon *tcon_ipc;
struct mutex session_mutex;
struct TCP_Server_Info *server; /* pointer to server info */
int ses_count; /* reference counter */
enum statusEnum status;
unsigned overrideSecFlg; /* if non-zero override global sec flags */
char *serverOS; /* name of operating system underlying server */
char *serverNOS; /* name of network operating system of server */
char *serverDomain; /* security realm of server */
__u64 Suid; /* remote smb uid */
kuid_t linux_uid; /* overriding owner of files on the mount */
kuid_t cred_uid; /* owner of credentials */
unsigned int capabilities;
char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */
char *user_name; /* must not be null except during init of sess
and after mount option parsing we fill it */
char *domainName;
char *password;
struct session_key auth_key;
struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
enum securityEnum sectype; /* what security flavor was specified? */
bool sign; /* is signing required? */
bool need_reconnect:1; /* connection reset, uid now invalid */
bool domainAuto:1;
bool binding:1; /* are we binding the session? */
__u16 session_flags;
__u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
__u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE];
__u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE];
__u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
__u8 binding_preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
/*
* Network interfaces available on the server this session is
* connected to.
*
* Other channels can be opened by connecting and binding this
* session to interfaces from this list.
*
* iface_lock should be taken when accessing any of these fields
*/
spinlock_t iface_lock;
struct cifs_server_iface *iface_list;
size_t iface_count;
unsigned long iface_last_update; /* jiffies */
#define CIFS_MAX_CHANNELS 16
struct cifs_chan chans[CIFS_MAX_CHANNELS];
struct cifs_chan *binding_chan;
size_t chan_count;
size_t chan_max;
atomic_t chan_seq; /* round robin state */
};
/*
* When binding a new channel, we need to access the channel which isn't fully
* established yet.
*/
static inline
struct cifs_chan *cifs_ses_binding_channel(struct cifs_ses *ses)
{
if (ses->binding)
return ses->binding_chan;
else
return NULL;
}
/*
* Returns the server pointer of the session. When binding a new
* channel this returns the last channel which isn't fully established
* yet.
*
* This function should be use for negprot/sess.setup codepaths. For
* the other requests see cifs_pick_channel().
*/
static inline
struct TCP_Server_Info *cifs_ses_server(struct cifs_ses *ses)
{
if (ses->binding)
return ses->binding_chan->server;
else
return ses->server;
}
static inline bool
cap_unix(struct cifs_ses *ses)
{
return ses->server->vals->cap_unix & ses->capabilities;
}
struct cached_fid {
bool is_valid:1; /* Do we have a useable root fid */
bool file_all_info_is_valid:1;
bool has_lease:1;
unsigned long time; /* jiffies of when lease was taken */
struct kref refcount;
struct cifs_fid *fid;
struct mutex fid_mutex;
struct cifs_tcon *tcon;
struct dentry *dentry;
struct work_struct lease_break;
struct smb2_file_all_info file_all_info;
};
/*
* there is one of these for each connection to a resource on a particular
* session
*/
struct cifs_tcon {
struct list_head tcon_list;
int tc_count;
struct list_head rlist; /* reconnect list */
atomic_t num_local_opens; /* num of all opens including disconnected */
atomic_t num_remote_opens; /* num of all network opens on server */
struct list_head openFileList;
spinlock_t open_file_lock; /* protects list above */
struct cifs_ses *ses; /* pointer to session associated with */
char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
char *nativeFileSystem;
char *password; /* for share-level security */
__u32 tid; /* The 4 byte tree id */
__u16 Flags; /* optional support bits */
enum statusEnum tidStatus;
atomic_t num_smbs_sent;
union {
struct {
atomic_t num_writes;
atomic_t num_reads;
atomic_t num_flushes;
atomic_t num_oplock_brks;
atomic_t num_opens;
atomic_t num_closes;
atomic_t num_deletes;
atomic_t num_mkdirs;
atomic_t num_posixopens;
atomic_t num_posixmkdirs;
atomic_t num_rmdirs;
atomic_t num_renames;
atomic_t num_t2renames;
atomic_t num_ffirst;
atomic_t num_fnext;
atomic_t num_fclose;
atomic_t num_hardlinks;
atomic_t num_symlinks;
atomic_t num_locks;
atomic_t num_acl_get;
atomic_t num_acl_set;
} cifs_stats;
struct {
atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
} smb2_stats;
} stats;
__u64 bytes_read;
__u64 bytes_written;
spinlock_t stat_lock; /* protects the two fields above */
FILE_SYSTEM_DEVICE_INFO fsDevInfo;
FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
FILE_SYSTEM_UNIX_INFO fsUnixInfo;
bool ipc:1; /* set if connection to IPC$ share (always also pipe) */
bool pipe:1; /* set if connection to pipe share */
bool print:1; /* set if connection to printer share */
bool retry:1;
bool nocase:1;
bool nohandlecache:1; /* if strange server resource prob can turn off */
bool nodelete:1;
bool seal:1; /* transport encryption for this mounted share */
bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol
for this mount even if server would support */
bool posix_extensions; /* if true SMB3.11 posix extensions enabled */
bool local_lease:1; /* check leases (only) on local system not remote */
bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
bool broken_sparse_sup; /* if server or share does not support sparse */
bool need_reconnect:1; /* connection reset, tid now invalid */
bool need_reopen_files:1; /* need to reopen tcon file handles */
bool use_resilient:1; /* use resilient instead of durable handles */
bool use_persistent:1; /* use persistent instead of durable handles */
bool no_lease:1; /* Do not request leases on files or directories */
bool use_witness:1; /* use witness protocol */
__le32 capabilities;
__u32 share_flags;
__u32 maximal_access;
__u32 vol_serial_number;
__le64 vol_create_time;
__u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
__u32 handle_timeout; /* persistent and durable handle timeout in ms */
__u32 ss_flags; /* sector size flags */
__u32 perf_sector_size; /* best sector size for perf */
__u32 max_chunks;
__u32 max_bytes_chunk;
__u32 max_bytes_copy;
#ifdef CONFIG_CIFS_FSCACHE
u64 resource_id; /* server resource id */
struct fscache_cookie *fscache; /* cookie for share */
#endif
struct list_head pending_opens; /* list of incomplete opens */
struct cached_fid crfid; /* Cached root fid */
/* BB add field for back pointer to sb struct(s)? */
#ifdef CONFIG_CIFS_DFS_UPCALL
char *dfs_path;
int remap:2;
struct list_head ulist; /* cache update list */
#endif
};
/*
* This is a refcounted and timestamped container for a tcon pointer. The
* container holds a tcon reference. It is considered safe to free one of
* these when the tl_count goes to 0. The tl_time is the time of the last
* "get" on the container.
*/
struct tcon_link {
struct rb_node tl_rbnode;
kuid_t tl_uid;
unsigned long tl_flags;
#define TCON_LINK_MASTER 0
#define TCON_LINK_PENDING 1
#define TCON_LINK_IN_TREE 2
unsigned long tl_time;
atomic_t tl_count;
struct cifs_tcon *tl_tcon;
};
extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst);
static inline struct cifs_tcon *
tlink_tcon(struct tcon_link *tlink)
{
return tlink->tl_tcon;
}
static inline struct tcon_link *
cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
{
return cifs_sb->master_tlink;
}
extern void cifs_put_tlink(struct tcon_link *tlink);
static inline struct tcon_link *
cifs_get_tlink(struct tcon_link *tlink)
{
if (tlink && !IS_ERR(tlink))
atomic_inc(&tlink->tl_count);
return tlink;
}
/* This function is always expected to succeed */
extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
#define CIFS_OPLOCK_NO_CHANGE 0xfe
struct cifs_pending_open {
struct list_head olist;
struct tcon_link *tlink;
__u8 lease_key[16];
__u32 oplock;
};
struct cifs_deferred_close {
struct list_head dlist;
struct tcon_link *tlink;
__u16 netfid;
__u64 persistent_fid;
__u64 volatile_fid;
};
/*
* This info hangs off the cifsFileInfo structure, pointed to by llist.
* This is used to track byte stream locks on the file
*/
struct cifsLockInfo {
struct list_head llist; /* pointer to next cifsLockInfo */
struct list_head blist; /* pointer to locks blocked on this */
wait_queue_head_t block_q;
__u64 offset;
__u64 length;
__u32 pid;
__u16 type;
__u16 flags;
};
/*
* One of these for each open instance of a file
*/
struct cifs_search_info {
loff_t index_of_last_entry;
__u16 entries_in_buffer;
__u16 info_level;
__u32 resume_key;
char *ntwrk_buf_start;
char *srch_entries_start;
char *last_entry;
const char *presume_name;
unsigned int resume_name_len;
bool endOfSearch:1;
bool emptyDir:1;
bool unicode:1;
bool smallBuf:1; /* so we know which buf_release function to call */
};
#define ACL_NO_MODE ((umode_t)(-1))
struct cifs_open_parms {
struct cifs_tcon *tcon;
struct cifs_sb_info *cifs_sb;
int disposition;
int desired_access;
int create_options;
const char *path;
struct cifs_fid *fid;
umode_t mode;
bool reconnect:1;
};
struct cifs_fid {
__u16 netfid;
__u64 persistent_fid; /* persist file id for smb2 */
__u64 volatile_fid; /* volatile file id for smb2 */
__u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */
__u8 create_guid[16];
__u32 access;
struct cifs_pending_open *pending_open;
unsigned int epoch;
#ifdef CONFIG_CIFS_DEBUG2
__u64 mid;
#endif /* CIFS_DEBUG2 */
bool purge_cache;
};
struct cifs_fid_locks {
struct list_head llist;
struct cifsFileInfo *cfile; /* fid that owns locks */
struct list_head locks; /* locks held by fid above */
};
struct cifsFileInfo {
/* following two lists are protected by tcon->open_file_lock */
struct list_head tlist; /* pointer to next fid owned by tcon */
struct list_head flist; /* next fid (file instance) for this inode */
/* lock list below protected by cifsi->lock_sem */
struct cifs_fid_locks *llist; /* brlocks held by this fid */
kuid_t uid; /* allows finding which FileInfo structure */
__u32 pid; /* process id who opened file */
struct cifs_fid fid; /* file id from remote */
struct list_head rlist; /* reconnect list */
/* BB add lock scope info here if needed */ ;
/* lock scope id (0 if none) */
struct dentry *dentry;
struct tcon_link *tlink;
unsigned int f_flags;
bool invalidHandle:1; /* file closed via session abend */
bool swapfile:1;
bool oplock_break_cancelled:1;
unsigned int oplock_epoch; /* epoch from the lease break */
__u32 oplock_level; /* oplock/lease level from the lease break */
int count;
spinlock_t file_info_lock; /* protects four flag/count fields above */
struct mutex fh_mutex; /* prevents reopen race after dead ses*/
struct cifs_search_info srch_inf;
struct work_struct oplock_break; /* work for oplock breaks */
struct work_struct put; /* work for the final part of _put */
struct delayed_work deferred;
bool deferred_close_scheduled; /* Flag to indicate close is scheduled */
};
struct cifs_io_parms {
__u16 netfid;
__u64 persistent_fid; /* persist file id for smb2 */
__u64 volatile_fid; /* volatile file id for smb2 */
__u32 pid;
__u64 offset;
unsigned int length;
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
};
struct cifs_aio_ctx {
struct kref refcount;
struct list_head list;
struct mutex aio_mutex;
struct completion done;
struct iov_iter iter;
struct kiocb *iocb;
struct cifsFileInfo *cfile;
struct bio_vec *bv;
loff_t pos;
unsigned int npages;
ssize_t rc;
unsigned int len;
unsigned int total_len;
bool should_dirty;
/*
* Indicates if this aio_ctx is for direct_io,
* If yes, iter is a copy of the user passed iov_iter
*/
bool direct_io;
};
/* asynchronous read support */
struct cifs_readdata {
struct kref refcount;
struct list_head list;
struct completion done;
struct cifsFileInfo *cfile;
struct address_space *mapping;
struct cifs_aio_ctx *ctx;
__u64 offset;
unsigned int bytes;
unsigned int got_bytes;
pid_t pid;
int result;
struct work_struct work;
int (*read_into_pages)(struct TCP_Server_Info *server,
struct cifs_readdata *rdata,
unsigned int len);
int (*copy_into_pages)(struct TCP_Server_Info *server,
struct cifs_readdata *rdata,
struct iov_iter *iter);
struct kvec iov[2];
struct TCP_Server_Info *server;
#ifdef CONFIG_CIFS_SMB_DIRECT
struct smbd_mr *mr;
#endif
unsigned int pagesz;
unsigned int page_offset;
unsigned int tailsz;
struct cifs_credits credits;
unsigned int nr_pages;
struct page **pages;
};
/* asynchronous write support */
struct cifs_writedata {
struct kref refcount;
struct list_head list;
struct completion done;
enum writeback_sync_modes sync_mode;
struct work_struct work;
struct cifsFileInfo *cfile;
struct cifs_aio_ctx *ctx;
__u64 offset;
pid_t pid;
unsigned int bytes;
int result;
struct TCP_Server_Info *server;
#ifdef CONFIG_CIFS_SMB_DIRECT
struct smbd_mr *mr;
#endif
unsigned int pagesz;
unsigned int page_offset;
unsigned int tailsz;
struct cifs_credits credits;
unsigned int nr_pages;
struct page **pages;
};
/*
* Take a reference on the file private data. Must be called with
* cfile->file_info_lock held.
*/
static inline void
cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
{
++cifs_file->count;
}
struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr,
bool offload);
void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
#define CIFS_CACHE_READ_FLG 1
#define CIFS_CACHE_HANDLE_FLG 2
#define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
#define CIFS_CACHE_WRITE_FLG 4
#define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
#define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
#define CIFS_CACHE_READ(cinode) ((cinode->oplock & CIFS_CACHE_READ_FLG) || (CIFS_SB(cinode->vfs_inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE))
#define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
#define CIFS_CACHE_WRITE(cinode) ((cinode->oplock & CIFS_CACHE_WRITE_FLG) || (CIFS_SB(cinode->vfs_inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE))
/*
* One of these for each file inode
*/
struct cifsInodeInfo {
bool can_cache_brlcks;
struct list_head llist; /* locks helb by this inode */
/*
* NOTE: Some code paths call down_read(lock_sem) twice, so
* we must always use cifs_down_write() instead of down_write()
* for this semaphore to avoid deadlocks.
*/
struct rw_semaphore lock_sem; /* protect the fields above */
/* BB add in lists for dirty pages i.e. write caching info for oplock */
struct list_head openFileList;
spinlock_t open_file_lock; /* protects openFileList */
__u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
unsigned int oplock; /* oplock/lease level we have */
unsigned int epoch; /* used to track lease state changes */
#define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */
#define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */
#define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */
#define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */
#define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */
#define CIFS_INO_LOCK (5) /* lock bit for synchronization */
#define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */
unsigned long flags;
spinlock_t writers_lock;
unsigned int writers; /* Number of writers on this inode */
unsigned long time; /* jiffies of last update of inode */
u64 server_eof; /* current file size on server -- protected by i_lock */
u64 uniqueid; /* server inode number */
u64 createtime; /* creation time on server */
__u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */
#ifdef CONFIG_CIFS_FSCACHE
struct fscache_cookie *fscache;
#endif
struct inode vfs_inode;
struct list_head deferred_closes; /* list of deferred closes */
spinlock_t deferred_lock; /* protection on deferred list */
bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */
};
static inline struct cifsInodeInfo *
CIFS_I(struct inode *inode)
{
return container_of(inode, struct cifsInodeInfo, vfs_inode);
}
static inline struct cifs_sb_info *
CIFS_SB(struct super_block *sb)
{
return sb->s_fs_info;
}
static inline struct cifs_sb_info *
CIFS_FILE_SB(struct file *file)
{
return CIFS_SB(file_inode(file)->i_sb);
}
static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
{
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
return '/';
else
return '\\';
}
static inline void
convert_delimiter(char *path, char delim)
{
char old_delim, *pos;
if (delim == '/')
old_delim = '\\';
else
old_delim = '/';
pos = path;
while ((pos = strchr(pos, old_delim)))
*pos = delim;
}
#define cifs_stats_inc atomic_inc
static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
unsigned int bytes)
{
if (bytes) {
spin_lock(&tcon->stat_lock);
tcon->bytes_written += bytes;
spin_unlock(&tcon->stat_lock);
}
}
static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
unsigned int bytes)
{
spin_lock(&tcon->stat_lock);
tcon->bytes_read += bytes;
spin_unlock(&tcon->stat_lock);
}
/*
* This is the prototype for the mid receive function. This function is for
* receiving the rest of the SMB frame, starting with the WordCount (which is
* just after the MID in struct smb_hdr). Note:
*
* - This will be called by cifsd, with no locks held.
* - The mid will still be on the pending_mid_q.
* - mid->resp_buf will point to the current buffer.
*
* Returns zero on a successful receive, or an error. The receive state in
* the TCP_Server_Info will also be updated.
*/
typedef int (mid_receive_t)(struct TCP_Server_Info *server,
struct mid_q_entry *mid);
/*
* This is the prototype for the mid callback function. This is called once the
* mid has been received off of the socket. When creating one, take special
* care to avoid deadlocks. Things to bear in mind:
*
* - it will be called by cifsd, with no locks held
* - the mid will be removed from any lists
*/
typedef void (mid_callback_t)(struct mid_q_entry *mid);
/*
* This is the protopyte for mid handle function. This is called once the mid
* has been recognized after decryption of the message.
*/
typedef int (mid_handle_t)(struct TCP_Server_Info *server,
struct mid_q_entry *mid);
/* one of these for every pending CIFS request to the server */
struct mid_q_entry {
struct list_head qhead; /* mids waiting on reply from this server */
struct kref refcount;
struct TCP_Server_Info *server; /* server corresponding to this mid */
__u64 mid; /* multiplex id */
__u16 credits; /* number of credits consumed by this mid */
__u16 credits_received; /* number of credits from the response */
__u32 pid; /* process id */
__u32 sequence_number; /* for CIFS signing */
unsigned long when_alloc; /* when mid was created */
#ifdef CONFIG_CIFS_STATS2
unsigned long when_sent; /* time when smb send finished */
unsigned long when_received; /* when demux complete (taken off wire) */
#endif
mid_receive_t *receive; /* call receive callback */
mid_callback_t *callback; /* call completion callback */
mid_handle_t *handle; /* call handle mid callback */
void *callback_data; /* general purpose pointer for callback */
struct task_struct *creator;
void *resp_buf; /* pointer to received SMB header */
unsigned int resp_buf_size;
int mid_state; /* wish this were enum but can not pass to wait_event */
unsigned int mid_flags;
__le16 command; /* smb command code */
unsigned int optype; /* operation type */
bool large_buf:1; /* if valid response, is pointer to large buf */
bool multiRsp:1; /* multiple trans2 responses for one request */
bool multiEnd:1; /* both received */
bool decrypted:1; /* decrypted entry */
};
struct close_cancelled_open {
struct cifs_fid fid;
struct cifs_tcon *tcon;
struct work_struct work;
__u64 mid;
__u16 cmd;
};
/* Make code in transport.c a little cleaner by moving
update of optional stats into function below */
static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
{
atomic_inc(&server->in_send);
}
static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
{
atomic_dec(&server->in_send);
}
static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
{
atomic_inc(&server->num_waiters);
}
static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
{
atomic_dec(&server->num_waiters);
}
#ifdef CONFIG_CIFS_STATS2
static inline void cifs_save_when_sent(struct mid_q_entry *mid)
{
mid->when_sent = jiffies;
}
#else
static inline void cifs_save_when_sent(struct mid_q_entry *mid)
{
}
#endif
/* for pending dnotify requests */
struct dir_notify_req {
struct list_head lhead;
__le16 Pid;
__le16 PidHigh;
__u16 Mid;
__u16 Tid;
__u16 Uid;
__u16 netfid;
__u32 filter; /* CompletionFilter (for multishot) */
int multishot;
struct file *pfile;
};
struct dfs_info3_param {
int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
int path_consumed;
int server_type;
int ref_flag;
char *path_name;
char *node_name;
int ttl;
};
/*
* common struct for holding inode info when searching for or updating an
* inode with new info
*/
#define CIFS_FATTR_DFS_REFERRAL 0x1
#define CIFS_FATTR_DELETE_PENDING 0x2
#define CIFS_FATTR_NEED_REVAL 0x4
#define CIFS_FATTR_INO_COLLISION 0x8
#define CIFS_FATTR_UNKNOWN_NLINK 0x10
#define CIFS_FATTR_FAKE_ROOT_INO 0x20
struct cifs_fattr {
u32 cf_flags;
u32 cf_cifsattrs;
u64 cf_uniqueid;
u64 cf_eof;
u64 cf_bytes;
u64 cf_createtime;
kuid_t cf_uid;
kgid_t cf_gid;
umode_t cf_mode;
dev_t cf_rdev;
unsigned int cf_nlink;
unsigned int cf_dtype;
struct timespec64 cf_atime;
struct timespec64 cf_mtime;
struct timespec64 cf_ctime;
u32 cf_cifstag;
};
static inline void free_dfs_info_param(struct dfs_info3_param *param)
{
if (param) {
kfree(param->path_name);
kfree(param->node_name);
}
}
static inline void free_dfs_info_array(struct dfs_info3_param *param,
int number_of_items)
{
int i;
if ((number_of_items == 0) || (param == NULL))
return;
for (i = 0; i < number_of_items; i++) {
kfree(param[i].path_name);
kfree(param[i].node_name);
}
kfree(param);
}
static inline bool is_interrupt_error(int error)
{
switch (error) {
case -EINTR:
case -ERESTARTSYS:
case -ERESTARTNOHAND:
case -ERESTARTNOINTR:
return true;
}
return false;
}
static inline bool is_retryable_error(int error)
{
if (is_interrupt_error(error) || error == -EAGAIN)
return true;
return false;
}
/* cifs_get_writable_file() flags */
#define FIND_WR_ANY 0
#define FIND_WR_FSUID_ONLY 1
#define FIND_WR_WITH_DELETE 2
#define MID_FREE 0
#define MID_REQUEST_ALLOCATED 1
#define MID_REQUEST_SUBMITTED 2
#define MID_RESPONSE_RECEIVED 4
#define MID_RETRY_NEEDED 8 /* session closed while this request out */
#define MID_RESPONSE_MALFORMED 0x10
#define MID_SHUTDOWN 0x20
/* Flags */
#define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */
#define MID_DELETED 2 /* Mid has been dequeued/deleted */
/* Types of response buffer returned from SendReceive2 */
#define CIFS_NO_BUFFER 0 /* Response buffer not returned */
#define CIFS_SMALL_BUFFER 1
#define CIFS_LARGE_BUFFER 2
#define CIFS_IOVEC 4 /* array of response buffers */
/* Type of Request to SendReceive2 */
#define CIFS_BLOCKING_OP 1 /* operation can block */
#define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */
#define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */
#define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */
#define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */
#define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */
/* Type of request operation */
#define CIFS_ECHO_OP 0x080 /* echo request */
#define CIFS_OBREAK_OP 0x0100 /* oplock break request */
#define CIFS_NEG_OP 0x0200 /* negotiate request */
#define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */
/* Lower bitmask values are reserved by others below. */
#define CIFS_SESS_OP 0x2000 /* session setup request */
#define CIFS_OP_MASK 0x2780 /* mask request type */
#define CIFS_HAS_CREDITS 0x0400 /* already has credits */
#define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */
#define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */
/* Security Flags: indicate type of session setup needed */
#define CIFSSEC_MAY_SIGN 0x00001
#define CIFSSEC_MAY_NTLM 0x00002
#define CIFSSEC_MAY_NTLMV2 0x00004
#define CIFSSEC_MAY_KRB5 0x00008
#ifdef CONFIG_CIFS_WEAK_PW_HASH
#define CIFSSEC_MAY_LANMAN 0x00010
#define CIFSSEC_MAY_PLNTXT 0x00020
#else
#define CIFSSEC_MAY_LANMAN 0
#define CIFSSEC_MAY_PLNTXT 0
#endif /* weak passwords */
#define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */
#define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */
#define CIFSSEC_MUST_SIGN 0x01001
/* note that only one of the following can be set so the
result of setting MUST flags more than once will be to
require use of the stronger protocol */
#define CIFSSEC_MUST_NTLM 0x02002
#define CIFSSEC_MUST_NTLMV2 0x04004
#define CIFSSEC_MUST_KRB5 0x08008
#ifdef CONFIG_CIFS_WEAK_PW_HASH
#define CIFSSEC_MUST_LANMAN 0x10010
#define CIFSSEC_MUST_PLNTXT 0x20020
#ifdef CONFIG_CIFS_UPCALL
#define CIFSSEC_MASK 0xBF0BF /* allows weak security but also krb5 */
#else
#define CIFSSEC_MASK 0xB70B7 /* current flags supported if weak */
#endif /* UPCALL */
#else /* do not allow weak pw hash */
#define CIFSSEC_MUST_LANMAN 0
#define CIFSSEC_MUST_PLNTXT 0
#ifdef CONFIG_CIFS_UPCALL
#define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */
#else
#define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */
#endif /* UPCALL */
#endif /* WEAK_PW_HASH */
#define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */
#define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */
#define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
#define CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
#define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
/*
*****************************************************************
* All constants go here
*****************************************************************
*/
#define UID_HASH (16)
/*
* Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
* following to be declared.
*/
/****************************************************************************
* Locking notes. All updates to global variables and lists should be
* protected by spinlocks or semaphores.
*
* Spinlocks
* ---------
* GlobalMid_Lock protects:
* list operations on pending_mid_q and oplockQ
* updates to XID counters, multiplex id and SMB sequence numbers
* list operations on global DnotifyReqList
* tcp_ses_lock protects:
* list operations on tcp and SMB session lists
* tcon->open_file_lock protects the list of open files hanging off the tcon
* inode->open_file_lock protects the openFileList hanging off the inode
* cfile->file_info_lock protects counters and fields in cifs file struct
* f_owner.lock protects certain per file struct operations
* mapping->page_lock protects certain per page operations
*
* Note that the cifs_tcon.open_file_lock should be taken before
* not after the cifsInodeInfo.open_file_lock
*
* Semaphores
* ----------
* cifsInodeInfo->lock_sem protects:
* the list of locks held by the inode
*
****************************************************************************/
#ifdef DECLARE_GLOBALS_HERE
#define GLOBAL_EXTERN
#else
#define GLOBAL_EXTERN extern
#endif
/*
* the list of TCP_Server_Info structures, ie each of the sockets
* connecting our client to a distinct server (ip address), is
* chained together by cifs_tcp_ses_list. The list of all our SMB
* sessions (and from that the tree connections) can be found
* by iterating over cifs_tcp_ses_list
*/
GLOBAL_EXTERN struct list_head cifs_tcp_ses_list;
/*
* This lock protects the cifs_tcp_ses_list, the list of smb sessions per
* tcp session, and the list of tcon's per smb session. It also protects
* the reference counters for the server, smb session, and tcon. It also
* protects some fields in the TCP_Server_Info struct such as dstaddr. Finally,
* changes to the tcon->tidStatus should be done while holding this lock.
* generally the locks should be taken in order tcp_ses_lock before
* tcon->open_file_lock and that before file->file_info_lock since the
* structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
*/
GLOBAL_EXTERN spinlock_t cifs_tcp_ses_lock;
/*
* Global transaction id (XID) information
*/
GLOBAL_EXTERN unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
GLOBAL_EXTERN unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
GLOBAL_EXTERN spinlock_t GlobalMid_Lock; /* protects above & list operations */
/* on midQ entries */
/*
* Global counters, updated atomically
*/
GLOBAL_EXTERN atomic_t sesInfoAllocCount;
GLOBAL_EXTERN atomic_t tconInfoAllocCount;
GLOBAL_EXTERN atomic_t tcpSesNextId;
GLOBAL_EXTERN atomic_t tcpSesAllocCount;
GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
/* Various Debug counters */
GLOBAL_EXTERN atomic_t bufAllocCount; /* current number allocated */
#ifdef CONFIG_CIFS_STATS2
GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
GLOBAL_EXTERN atomic_t totSmBufAllocCount;
extern unsigned int slow_rsp_threshold; /* number of secs before logging */
#endif
GLOBAL_EXTERN atomic_t smBufAllocCount;
GLOBAL_EXTERN atomic_t midCount;
/* Misc globals */
extern bool enable_oplocks; /* enable or disable oplocks */
extern bool lookupCacheEnabled;
extern unsigned int global_secflags; /* if on, session setup sent
with more secure ntlmssp2 challenge/resp */
extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */
extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */
extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */
extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
extern unsigned int CIFSMaxBufSize; /* max size not including hdr */
extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */
extern unsigned int cifs_min_small; /* min size of small buf pool */
extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */
void cifs_oplock_break(struct work_struct *work);
void cifs_queue_oplock_break(struct cifsFileInfo *cfile);
void smb2_deferred_work_close(struct work_struct *work);
extern const struct slow_work_ops cifs_oplock_break_ops;
extern struct workqueue_struct *cifsiod_wq;
extern struct workqueue_struct *decrypt_wq;
extern struct workqueue_struct *fileinfo_put_wq;
extern struct workqueue_struct *cifsoplockd_wq;
extern struct workqueue_struct *deferredclose_wq;
extern __u32 cifs_lock_secret;
extern mempool_t *cifs_mid_poolp;
/* Operations for different SMB versions */
#define SMB1_VERSION_STRING "1.0"
extern struct smb_version_operations smb1_operations;
extern struct smb_version_values smb1_values;
#define SMB20_VERSION_STRING "2.0"
extern struct smb_version_operations smb20_operations;
extern struct smb_version_values smb20_values;
#define SMB21_VERSION_STRING "2.1"
extern struct smb_version_operations smb21_operations;
extern struct smb_version_values smb21_values;
#define SMBDEFAULT_VERSION_STRING "default"
extern struct smb_version_values smbdefault_values;
#define SMB3ANY_VERSION_STRING "3"
extern struct smb_version_values smb3any_values;
#define SMB30_VERSION_STRING "3.0"
extern struct smb_version_operations smb30_operations;
extern struct smb_version_values smb30_values;
#define SMB302_VERSION_STRING "3.02"
#define ALT_SMB302_VERSION_STRING "3.0.2"
/*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
extern struct smb_version_values smb302_values;
#define SMB311_VERSION_STRING "3.1.1"
#define ALT_SMB311_VERSION_STRING "3.11"
extern struct smb_version_operations smb311_operations;
extern struct smb_version_values smb311_values;
static inline char *get_security_type_str(enum securityEnum sectype)
{
switch (sectype) {
case RawNTLMSSP:
return "RawNTLMSSP";
case Kerberos:
return "Kerberos";
case NTLMv2:
return "NTLMv2";
case NTLM:
return "NTLM";
case LANMAN:
return "LANMAN";
default:
return "Unknown";
}
}
static inline bool is_smb1_server(struct TCP_Server_Info *server)
{
return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0;
}
static inline bool is_tcon_dfs(struct cifs_tcon *tcon)
{
/*
* For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS
* Subsystem Notifies That a Share Is a DFS Share.
*
* For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server
* Application Updates a Share.
*/
if (!tcon || !tcon->ses || !tcon->ses->server)
return false;
return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS :
tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT);
}
#endif /* _CIFS_GLOB_H */
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