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Diffstat (limited to 'fs/smb/client/cifsglob.h')
| -rw-r--r-- | fs/smb/client/cifsglob.h | 2178 |
1 files changed, 2178 insertions, 0 deletions
diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h new file mode 100644 index 000000000..7f1aea4c1 --- /dev/null +++ b/fs/smb/client/cifsglob.h @@ -0,0 +1,2178 @@ +/* SPDX-License-Identifier: LGPL-2.1 */ +/* + * + * Copyright (C) International Business Machines Corp., 2002,2008 + * Author(s): Steve French (sfrench@us.ibm.com) + * Jeremy Allison (jra@samba.org) + * + */ +#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/scatterlist.h> +#include <linux/mm.h> +#include <linux/mempool.h> +#include <linux/workqueue.h> +#include <linux/utsname.h> +#include <linux/sched/mm.h> +#include <linux/netfs.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 "../common/smb2pdu.h" +#include "smb2pdu.h" + +#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 + +/* dns resolution intervals in seconds */ +#define SMB_DNS_RESOLVE_INTERVAL_MIN 120 +#define SMB_DNS_RESOLVE_INTERVAL_DEFAULT 600 + +/* smb multichannel query server interfaces interval in seconds */ +#define SMB_INTERFACE_POLL_INTERVAL 600 + +/* 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 + +#define CIFS_MAX_WORKSTATION_LEN (__NEW_UTS_LEN + 1) /* reasonable max for client */ + +/* + * CIFS vfs client Status information (based on what we know.) + */ + +/* associated with each connection */ +enum statusEnum { + CifsNew = 0, + CifsGood, + CifsExiting, + CifsNeedReconnect, + CifsNeedNegotiate, + CifsInNegotiate, +}; + +/* associated with each smb session */ +enum ses_status_enum { + SES_NEW = 0, + SES_GOOD, + SES_EXITING, + SES_NEED_RECON, + SES_IN_SETUP +}; + +/* associated with each tree connection to the server */ +enum tid_status_enum { + TID_NEW = 0, + TID_GOOD, + TID_EXITING, + TID_NEED_RECON, + TID_NEED_TCON, + TID_IN_TCON, + TID_NEED_FILES_INVALIDATE, /* currently unused */ + TID_IN_FILES_INVALIDATE +}; + +enum securityEnum { + Unspecified = 0, /* not specified */ + 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 hashing related structure/fields, not specific to a sec mech */ +struct cifs_secmech { + struct shash_desc *hmacmd5; /* hmacmd5 hash function, for NTLMv2/CR1 hashes */ + struct shash_desc *md5; /* md5 hash function, for CIFS/SMB1 signatures */ + struct shash_desc *hmacsha256; /* hmac-sha256 hash function, for SMB2 signatures */ + struct shash_desc *sha512; /* sha512 hash function, for SMB3.1.1 preauth hash */ + struct shash_desc *aes_cmac; /* block-cipher based MAC function, for SMB3 signatures */ + + struct crypto_aead *enc; /* smb3 encryption AEAD TFM (AES-CCM and AES-GCM) */ + struct crypto_aead *dec; /* smb3 decryption AEAD TFM (AES-CCM and AES-GCM) */ +}; + +/* 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; +}; + +struct cifs_open_info_data { + char *symlink_target; + union { + struct smb2_file_all_info fi; + struct smb311_posix_qinfo posix_fi; + }; +}; + +static inline void cifs_free_open_info(struct cifs_open_info_data *data) +{ + kfree(data->symlink_target); +} + +/* + ***************************************************************** + * 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 xid, + struct cifs_ses *ses, + struct TCP_Server_Info *server); + /* 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 *, + struct TCP_Server_Info *server, + 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 xid, struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, const char *full_path, + struct cifs_open_info_data *data, bool *adjust_tz, bool *reparse); + /* query file data from the server */ + int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon, + struct cifsFileInfo *cfile, struct cifs_open_info_data *data); + /* 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 xid, struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid, + struct cifs_open_info_data *data); + /* 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 xid, struct cifs_open_parms *oparms, __u32 *oplock, + void *buf); + /* 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); + /* 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 *tcon, __u64 persistent_fid, __u64 volatile_fid, + __u16 net_fid, struct cifsInodeInfo *cifs_inode); + /* 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 *ses, + struct TCP_Server_Info *server); + 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, bool return_changes); + 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)(struct TCP_Server_Info *server, char *buf, + unsigned int *noff); + /* 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) +#define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size) +#define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server)) + +/** + * 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; + spinlock_t srv_lock; /* protect anything here that is not protected */ + __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; + /* updates to tcpStatus protected by cifs_tcp_ses_lock */ + 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*/ + spinlock_t mid_lock; /* protect mid queue and it's entries */ + struct list_head pending_mid_q; + bool noblocksnd; /* use blocking sendmsg */ + bool noautotune; /* do not autotune send buf sizes */ + bool nosharesock; + 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; + unsigned int nofs_flag; + 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, protected by GlobalMid_Lock */ + 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_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 */ + struct delayed_work resolve; /* dns resolution 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_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; + __u16 signing_algorithm; + __le16 cipher_type; + /* save initital negprot hash */ + __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; + bool signing_negotiated; /* true if valid signing context rcvd from server */ + 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() */ + + /* + * If this is a session channel, + * primary_server holds the ref-counted + * pointer to primary channel connection for the session. + */ +#define CIFS_SERVER_IS_CHAN(server) (!!(server)->primary_server) + struct TCP_Server_Info *primary_server; + __u16 channel_sequence_num; /* incremented on primary channel on each chan reconnect */ + +#ifdef CONFIG_CIFS_SWN_UPCALL + bool use_swn_dstaddr; + struct sockaddr_storage swn_dstaddr; +#endif +#ifdef CONFIG_CIFS_DFS_UPCALL + bool is_dfs_conn; /* if a dfs connection */ + struct mutex refpath_lock; /* protects leaf_fullpath */ + /* + * Canonical DFS full paths that were used to chase referrals in mount and reconnect. + * + * origin_fullpath: first or original referral path + * leaf_fullpath: last referral path (might be changed due to nested links in reconnect) + * + * current_fullpath: pointer to either origin_fullpath or leaf_fullpath + * NOTE: cannot be accessed outside cifs_reconnect() and smb2_reconnect() + * + * format: \\HOST\SHARE\[OPTIONAL PATH] + */ + char *origin_fullpath, *leaf_fullpath, *current_fullpath; +#endif +}; + +static inline bool is_smb1(struct TCP_Server_Info *server) +{ + return HEADER_PREAMBLE_SIZE(server) != 0; +} + +static inline void cifs_server_lock(struct TCP_Server_Info *server) +{ + unsigned int nofs_flag = memalloc_nofs_save(); + + mutex_lock(&server->_srv_mutex); + server->nofs_flag = nofs_flag; +} + +static inline void cifs_server_unlock(struct TCP_Server_Info *server) +{ + unsigned int nofs_flag = server->nofs_flag; + + mutex_unlock(&server->_srv_mutex); + memalloc_nofs_restore(nofs_flag); +} + +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_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) + +#define CIFS_DEFAULT_IOSIZE (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 { + struct list_head iface_head; + struct kref refcount; + size_t speed; + size_t weight_fulfilled; + unsigned int num_channels; + unsigned int rdma_capable : 1; + unsigned int rss_capable : 1; + unsigned int is_active : 1; /* unset if non existent */ + struct sockaddr_storage sockaddr; +}; + +/* release iface when last ref is dropped */ +static inline void +release_iface(struct kref *ref) +{ + struct cifs_server_iface *iface = container_of(ref, + struct cifs_server_iface, + refcount); + kfree(iface); +} + +struct cifs_chan { + unsigned int in_reconnect : 1; /* if session setup in progress for this channel */ + struct TCP_Server_Info *server; + struct cifs_server_iface *iface; /* interface in use */ + __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 rlist; /* reconnect list */ + struct list_head tcon_list; + struct cifs_tcon *tcon_ipc; + spinlock_t ses_lock; /* protect anything here that is not protected */ + struct mutex session_mutex; + struct TCP_Server_Info *server; /* pointer to server info */ + int ses_count; /* reference counter */ + enum ses_status_enum ses_status; /* updates protected by cifs_tcp_ses_lock */ + unsigned int 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; + char workstation_name[CIFS_MAX_WORKSTATION_LEN]; + 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 domainAuto:1; + __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]; + + /* + * 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; + /* ========= begin: protected by iface_lock ======== */ + struct list_head iface_list; + size_t iface_count; + unsigned long iface_last_update; /* jiffies */ + /* ========= end: protected by iface_lock ======== */ + + spinlock_t chan_lock; + /* ========= begin: protected by chan_lock ======== */ +#define CIFS_MAX_CHANNELS 16 +#define CIFS_ALL_CHANNELS_SET(ses) \ + ((1UL << (ses)->chan_count) - 1) +#define CIFS_ALL_CHANS_GOOD(ses) \ + (!(ses)->chans_need_reconnect) +#define CIFS_ALL_CHANS_NEED_RECONNECT(ses) \ + ((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses)) +#define CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses) \ + ((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses)) +#define CIFS_CHAN_NEEDS_RECONNECT(ses, index) \ + test_bit((index), &(ses)->chans_need_reconnect) +#define CIFS_CHAN_IN_RECONNECT(ses, index) \ + ((ses)->chans[(index)].in_reconnect) + + struct cifs_chan chans[CIFS_MAX_CHANNELS]; + size_t chan_count; + size_t chan_max; + atomic_t chan_seq; /* round robin state */ + + /* + * chans_need_reconnect is a bitmap indicating which of the channels + * under this smb session needs to be reconnected. + * If not multichannel session, only one bit will be used. + * + * We will ask for sess and tcon reconnection only if all the + * channels are marked for needing reconnection. This will + * enable the sessions on top to continue to live till any + * of the channels below are active. + */ + unsigned long chans_need_reconnect; + /* ========= end: protected by chan_lock ======== */ +}; + +static inline bool +cap_unix(struct cifs_ses *ses) +{ + return ses->server->vals->cap_unix & ses->capabilities; +} + +/* + * 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; + char *cf_symlink_target; +}; + +/* + * 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 */ + spinlock_t tc_lock; /* protect anything here that is not protected */ + 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 tree_name[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 tid_status_enum status; + 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_volume *fscache; /* cookie for share */ +#endif + struct list_head pending_opens; /* list of incomplete opens */ + struct cached_fids *cfids; + /* BB add field for back pointer to sb struct(s)? */ +#ifdef CONFIG_CIFS_DFS_UPCALL + struct list_head ulist; /* cache update list */ +#endif + struct delayed_work query_interfaces; /* query interfaces workqueue job */ +}; + +/* + * 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 */ + char *symlink_target; +}; + +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->netfs.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->netfs.inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)) + +/* + * One of these for each file inode + */ + +struct cifsInodeInfo { + struct netfs_inode netfs; /* Netfslib context and vfs inode */ + 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 */ +#define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */ + 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 */ + 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. */ + char *symlink_target; +}; + +static inline struct cifsInodeInfo * +CIFS_I(struct inode *inode) +{ + return container_of(inode, struct cifsInodeInfo, netfs.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; +}; + +struct file_list { + struct list_head list; + struct cifsFileInfo *cfile; +}; + +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 +#define MID_RESPONSE_READY 0x40 /* ready for other process handle the rsp */ + +/* 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_NTLMV2 0x00004 +#define CIFSSEC_MAY_KRB5 0x00008 +#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_NTLMV2 0x04004 +#define CIFSSEC_MUST_KRB5 0x08008 +#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 */ +#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_NTLMV2) +#define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | 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. + */ + +/**************************************************************************** + * Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according + * to the locking order. i.e. if two locks are to be held together, the lock that + * appears higher in this list needs to be taken before the other. + * + * If you hold a lock that is lower in this list, and you need to take a higher lock + * (or if you think that one of the functions that you're calling may need to), first + * drop the lock you hold, pick up the higher lock, then the lower one. This will + * ensure that locks are picked up only in one direction in the below table + * (top to bottom). + * + * Also, if you expect a function to be called with a lock held, explicitly document + * this in the comments on top of your function definition. + * + * And also, try to keep the critical sections (lock hold time) to be as minimal as + * possible. Blocking / calling other functions with a lock held always increase + * the risk of a possible deadlock. + * + * Following this rule will avoid unnecessary deadlocks, which can get really hard to + * debug. Also, any new lock that you introduce, please add to this list in the correct + * order. + * + * Please populate this list whenever you introduce new locks in your changes. Or in + * case I've missed some existing locks. Please ensure that it's added in the list + * based on the locking order expected. + * + * ===================================================================================== + * Lock Protects Initialization fn + * ===================================================================================== + * vol_list_lock + * vol_info->ctx_lock vol_info->ctx + * cifs_sb_info->tlink_tree_lock cifs_sb_info->tlink_tree cifs_setup_cifs_sb + * TCP_Server_Info-> TCP_Server_Info cifs_get_tcp_session + * reconnect_mutex + * TCP_Server_Info->srv_mutex TCP_Server_Info cifs_get_tcp_session + * cifs_ses->session_mutex cifs_ses sesInfoAlloc + * cifs_tcon + * cifs_tcon->open_file_lock cifs_tcon->openFileList tconInfoAlloc + * cifs_tcon->pending_opens + * cifs_tcon->stat_lock cifs_tcon->bytes_read tconInfoAlloc + * cifs_tcon->bytes_written + * cifs_tcp_ses_lock cifs_tcp_ses_list sesInfoAlloc + * GlobalMid_Lock GlobalMaxActiveXid init_cifs + * GlobalCurrentXid + * GlobalTotalActiveXid + * TCP_Server_Info->srv_lock (anything in struct not protected by another lock and can change) + * TCP_Server_Info->mid_lock TCP_Server_Info->pending_mid_q cifs_get_tcp_session + * ->CurrentMid + * (any changes in mid_q_entry fields) + * TCP_Server_Info->req_lock TCP_Server_Info->in_flight cifs_get_tcp_session + * ->credits + * ->echo_credits + * ->oplock_credits + * ->reconnect_instance + * cifs_ses->ses_lock (anything that is not protected by another lock and can change) + * cifs_ses->iface_lock cifs_ses->iface_list sesInfoAlloc + * ->iface_count + * ->iface_last_update + * cifs_ses->chan_lock cifs_ses->chans + * ->chans_need_reconnect + * ->chans_in_reconnect + * cifs_tcon->tc_lock (anything that is not protected by another lock and can change) + * cifsInodeInfo->open_file_lock cifsInodeInfo->openFileList cifs_alloc_inode + * cifsInodeInfo->writers_lock cifsInodeInfo->writers cifsInodeInfo_alloc + * cifsInodeInfo->lock_sem cifsInodeInfo->llist cifs_init_once + * ->can_cache_brlcks + * cifsInodeInfo->deferred_lock cifsInodeInfo->deferred_closes cifsInodeInfo_alloc + * cached_fid->fid_mutex cifs_tcon->crfid tconInfoAlloc + * cifsFileInfo->fh_mutex cifsFileInfo cifs_new_fileinfo + * cifsFileInfo->file_info_lock cifsFileInfo->count cifs_new_fileinfo + * ->invalidHandle initiate_cifs_search + * ->oplock_break_cancelled + * cifs_aio_ctx->aio_mutex cifs_aio_ctx cifs_aio_ctx_alloc + ****************************************************************************/ + +#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 + */ +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. + * 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 + */ +extern spinlock_t cifs_tcp_ses_lock; + +/* + * Global transaction id (XID) information + */ +extern unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */ +extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */ +extern unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */ +extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */ + +/* + * Global counters, updated atomically + */ +extern atomic_t sesInfoAllocCount; +extern atomic_t tconInfoAllocCount; +extern atomic_t tcpSesNextId; +extern atomic_t tcpSesAllocCount; +extern atomic_t tcpSesReconnectCount; +extern atomic_t tconInfoReconnectCount; + +/* Various Debug counters */ +extern atomic_t buf_alloc_count; /* current number allocated */ +extern atomic_t small_buf_alloc_count; +#ifdef CONFIG_CIFS_STATS2 +extern atomic_t total_buf_alloc_count; /* total allocated over all time */ +extern atomic_t total_small_buf_alloc_count; +extern unsigned int slow_rsp_threshold; /* number of secs before logging */ +#endif + +/* 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 enable_negotiate_signing; /* request use of faster (GMAC) signing if available */ +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 */ +extern atomic_t mid_count; + +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" +#define SMB20_VERSION_STRING "2.0" +#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY +extern struct smb_version_operations smb1_operations; +extern struct smb_version_values smb1_values; +extern struct smb_version_operations smb20_operations; +extern struct smb_version_values smb20_values; +#endif /* CIFS_ALLOW_INSECURE_LEGACY */ +#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"; + 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); +} + +static inline bool cifs_is_referral_server(struct cifs_tcon *tcon, + const struct dfs_info3_param *ref) +{ + /* + * Check if all targets are capable of handling DFS referrals as per + * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL. + */ + return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER)); +} + +static inline u64 cifs_flock_len(const struct file_lock *fl) +{ + return (u64)fl->fl_end - fl->fl_start + 1; +} + +static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses) +{ + if (WARN_ON_ONCE(!ses || !ses->server)) + return 0; + /* + * Make workstation name no more than 15 chars when using insecure dialects as some legacy + * servers do require it during NTLMSSP. + */ + if (ses->server->dialect <= SMB20_PROT_ID) + return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL); + return sizeof(ses->workstation_name); +} + +static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src) +{ + memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src)); + dst->AccessFlags = src->AccessFlags; + dst->CurrentByteOffset = src->CurrentByteOffset; + dst->Mode = src->Mode; + dst->AlignmentRequirement = src->AlignmentRequirement; + dst->FileNameLength = src->FileNameLength; +} + +static inline unsigned int cifs_get_num_sgs(const struct smb_rqst *rqst, + int num_rqst, + const u8 *sig) +{ + unsigned int len, skip; + unsigned int nents = 0; + unsigned long addr; + int i, j; + + /* Assumes the first rqst has a transform header as the first iov. + * I.e. + * rqst[0].rq_iov[0] is transform header + * rqst[0].rq_iov[1+] data to be encrypted/decrypted + * rqst[1+].rq_iov[0+] data to be encrypted/decrypted + */ + for (i = 0; i < num_rqst; i++) { + /* + * The first rqst has a transform header where the + * first 20 bytes are not part of the encrypted blob. + */ + for (j = 0; j < rqst[i].rq_nvec; j++) { + struct kvec *iov = &rqst[i].rq_iov[j]; + + skip = (i == 0) && (j == 0) ? 20 : 0; + addr = (unsigned long)iov->iov_base + skip; + if (unlikely(is_vmalloc_addr((void *)addr))) { + len = iov->iov_len - skip; + nents += DIV_ROUND_UP(offset_in_page(addr) + len, + PAGE_SIZE); + } else { + nents++; + } + } + nents += rqst[i].rq_npages; + } + nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE); + return nents; +} + +/* We can not use the normal sg_set_buf() as we will sometimes pass a + * stack object as buf. + */ +static inline struct scatterlist *cifs_sg_set_buf(struct scatterlist *sg, + const void *buf, + unsigned int buflen) +{ + unsigned long addr = (unsigned long)buf; + unsigned int off = offset_in_page(addr); + + addr &= PAGE_MASK; + if (unlikely(is_vmalloc_addr((void *)addr))) { + do { + unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off); + + sg_set_page(sg++, vmalloc_to_page((void *)addr), len, off); + + off = 0; + addr += PAGE_SIZE; + buflen -= len; + } while (buflen); + } else { + sg_set_page(sg++, virt_to_page(addr), buflen, off); + } + return sg; +} + +#endif /* _CIFS_GLOB_H */ |