1 /* SPDX-License-Identifier: LGPL-2.1 */
58  * max attribute cache timeout (jiffies) - 2^30
112 #define CIFS_DFS_ROOT_SES(ses) ((ses)->dfs_root_ses ?: (ses))
225 	struct shash_desc *hmacsha256; /* hmac-sha256 hash function, for SMB2 signatures */
227 	struct shash_desc *aes_cmac; /* block-cipher based MAC function, for SMB3 signatures */
229 	struct crypto_aead *enc; /* smb3 encryption AEAD TFM (AES-CCM and AES-GCM) */
230 	struct crypto_aead *dec; /* smb3 decryption AEAD TFM (AES-CCM and AES-GCM) */
342 	 * message field DataRemaining for out-of-band data read (e.g through
372 	unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
374 	unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
401 			       struct cifs_tcon *tcon,
406 	int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon,
410 				   struct cifs_tcon *tcon,
416 	int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon,
437 			umode_t mode, struct cifs_tcon *tcon,
441 		     struct cifs_tcon *tcon, const char *name,
458 		      struct cifs_tcon *tcon,
464 			       struct cifs_tcon *tcon,
470 			     struct cifs_tcon *tcon,
474 	/* open a file for non-posix mounts */
477 	/* set fid protocol-specific info */
483 	int (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon,
518 	int (*oplock_response)(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid,
541 	int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
543 	int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
607 				struct cifs_tcon *tcon,
615 			 struct cifs_tcon *tcon,
620 	int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *,
635 				      struct cifs_tcon *tcon,
661 #define HEADER_SIZE(server) (server->vals->header_size)
662 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
663 #define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size)
664 #define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server))
761 	/* message size the server can send or receive for non-raw SMBs */
769 	__u64 CurrentMid;         /* multiplex id - rotating counter, protected by GlobalMid_Lock */
786 	bool	sec_iakerb;		/* supports pass-through auth for Kerberos (krb5 proxy) */
832 	bool noblockcnt; /* use non-blocking connect() */
835 	 * If this is a session channel,
836 	 * primary_server holds the ref-counted
837 	 * pointer to primary channel connection for the session.
839 #define SERVER_IS_CHAN(server)	(!!(server)->primary_server)
841 	__u16 channel_sequence_num;  /* incremented on primary channel on each chan reconnect */
867 	mutex_lock(&server->_srv_mutex);  in cifs_server_lock()
868 	server->nofs_flag = nofs_flag;  in cifs_server_lock()
873 	unsigned int nofs_flag = server->nofs_flag;  in cifs_server_unlock()
875 	mutex_unlock(&server->_srv_mutex);  in cifs_server_unlock()
892 	spin_lock(&server->req_lock);  in in_flight()
893 	num = server->in_flight;  in in_flight()
894 	spin_unlock(&server->req_lock);  in in_flight()
903 	spin_lock(&server->req_lock);  in has_credits()
905 	spin_unlock(&server->req_lock);  in has_credits()
913 	server->ops->add_credits(server, credits, optype);  in add_credits()
920 	if (credits->value) {  in add_credits_and_wake_if()
921 		server->ops->add_credits(server, credits, optype);  in add_credits_and_wake_if()
922 		wake_up(&server->request_q);  in add_credits_and_wake_if()
923 		credits->value = 0;  in add_credits_and_wake_if()
930 	server->ops->set_credits(server, val);  in set_credits()
937 	return server->ops->adjust_credits ?  in adjust_credits()
938 		server->ops->adjust_credits(server, subreq, trace) : 0;  in adjust_credits()
944 	return cpu_to_le64(server->ops->get_next_mid(server));  in get_next_mid64()
950 	__u16 mid = server->ops->get_next_mid(server);  in get_next_mid()
953 	 * on-the-wire decoding.  in get_next_mid()
961 	if (server->ops->revert_current_mid)  in revert_current_mid()
962 		server->ops->revert_current_mid(server, val);  in revert_current_mid()
969 	unsigned int num = le16_to_cpu(shdr->CreditCharge);  in revert_current_mid_from_hdr()
977 	return le16_to_cpu(smb->Mid);  in get_mid()
983 	return mid == le16_to_cpu(smb->Mid);  in compare_mid()
988  * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
999 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
1000 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
1004  * of 2^17-1 minus the size of the call header. That allows for a read or
1007 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
1008 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
1021 …s.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance…
1027  * Macros to allow the TCP_Server_Info->net field and related code to drop out
1035 	return srv->net;  in cifs_net_ns()
1040 	srv->net = net;  in cifs_set_net_ns()
1079 	unsigned int in_reconnect : 1; /* if session setup in progress for this channel */
1101 	unsigned int overrideSecFlg; /* if non-zero override global sec flags */
1149 #define CIFS_INVAL_CHAN_INDEX (-1)
1151 	((1UL << (ses)->chan_count) - 1)
1153 	(!(ses)->chans_need_reconnect)
1155 	((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses))
1157 	((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses))
1159 	test_bit((index), &(ses)->chans_need_reconnect)
1161 	((ses)->chans[(index)].in_reconnect)
1173 	 * We will ask for sess and tcon reconnection only if all the
1188 	return ses->server->vals->cap_unix & ses->capabilities;  in cap_unix()
1240 	char *password;		/* for share-level security */
1296 	bool need_reopen_files:1; /* need to reopen tcon file handles */
1306 	__u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
1332  * This is a refcounted and timestamped container for a tcon pointer. The
1333  * container holds a tcon reference. It is considered safe to free one of
1355 	return tlink->tl_tcon;  in tlink_tcon()
1361 	return cifs_sb->master_tlink;  in cifs_sb_master_tlink()
1370 		atomic_inc(&tlink->tl_count);  in cifs_get_tlink()
1428 #define ACL_NO_MODE	((umode_t)(-1))
1430 	struct cifs_tcon *tcon;  member
1465 	/* following two lists are protected by tcon->open_file_lock */
1466 	struct list_head tlist;	/* pointer to next fid owned by tcon */
1468 	/* lock list below protected by cifsi->lock_sem */
1505 	struct cifs_tcon *tcon;  member
1537  * cfile->file_info_lock held.
1542 	++cifs_file->count;  in cifsFileInfo_get_locked()
1557 #define CIFS_CACHE_READ(cinode) ((cinode->oplock & CIFS_CACHE_READ_FLG) || (CIFS_SB(cinode->netfs.i…
1558 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1559 #define CIFS_CACHE_WRITE(cinode) ((cinode->oplock & CIFS_CACHE_WRITE_FLG) || (CIFS_SB(cinode->netfs…
1611 	return sb->s_fs_info;  in CIFS_SB()
1617 	return CIFS_SB(file_inode(file)->i_sb);  in CIFS_FILE_SB()
1622 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)  in CIFS_DIR_SEP()
1645 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,  in cifs_stats_bytes_written()  argument
1649 		spin_lock(&tcon->stat_lock);  in cifs_stats_bytes_written()
1650 		tcon->bytes_written += bytes;  in cifs_stats_bytes_written()
1651 		spin_unlock(&tcon->stat_lock);  in cifs_stats_bytes_written()
1655 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,  in cifs_stats_bytes_read()  argument
1658 	spin_lock(&tcon->stat_lock);  in cifs_stats_bytes_read()
1659 	tcon->bytes_read += bytes;  in cifs_stats_bytes_read()
1660 	spin_unlock(&tcon->stat_lock);  in cifs_stats_bytes_read()
1669  * - This will be called by cifsd, with no locks held.
1670  * - The mid will still be on the pending_mid_q.
1671  * - mid->resp_buf will point to the current buffer.
1684  * - it will be called by cifsd, with no locks held
1685  * - the mid will be removed from any lists
1730 	struct cifs_tcon        *tcon;  member
1740 	atomic_inc(&server->in_send);  in cifs_in_send_inc()
1745 	atomic_dec(&server->in_send);  in cifs_in_send_dec()
1750 	atomic_inc(&server->num_waiters);  in cifs_num_waiters_inc()
1755 	atomic_dec(&server->num_waiters);  in cifs_num_waiters_dec()
1761 	mid->when_sent = jiffies;  in cifs_save_when_sent()
1804 	struct cifs_tcon *tcon;  member
1809 	kfree(param->path_name);  in __free_dfs_info_param()
1810 	kfree(param->node_name);  in __free_dfs_info_param()
1844 	case -EINTR:  in is_interrupt_error()
1845 	case -ERESTARTSYS:  in is_interrupt_error()
1846 	case -ERESTARTNOHAND:  in is_interrupt_error()
1847 	case -ERESTARTNOINTR:  in is_interrupt_error()
1855 	if (is_interrupt_error(error) || error == -EAGAIN)  in is_retryable_error()
1862 	if (error == -EAGAIN || error == -ECONNABORTED)  in is_replayable_error()
1896 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
1981  * vol_info->ctx_lock		vol_info->ctx
1982  * cifs_sb_info->tlink_tree_lock	cifs_sb_info->tlink_tree	cifs_setup_cifs_sb
1983  * TCP_Server_Info->		TCP_Server_Info			cifs_get_tcp_session
1985  * TCP_Server_Info->srv_mutex	TCP_Server_Info			cifs_get_tcp_session
1986  * cifs_ses->session_mutex		cifs_ses		sesInfoAlloc
1988  * cifs_tcon->open_file_lock	cifs_tcon->openFileList		tconInfoAlloc
1989  *				cifs_tcon->pending_opens
1990  * cifs_tcon->stat_lock		cifs_tcon->bytes_read		tconInfoAlloc
1991  *				cifs_tcon->bytes_written
1996  * TCP_Server_Info->srv_lock	(anything in struct not protected by another lock and can change)
1997  * TCP_Server_Info->mid_lock	TCP_Server_Info->pending_mid_q	cifs_get_tcp_session
1998  *				->CurrentMid
2000  * TCP_Server_Info->req_lock	TCP_Server_Info->in_flight	cifs_get_tcp_session
2001  *				->credits
2002  *				->echo_credits
2003  *				->oplock_credits
2004  *				->reconnect_instance
2005  * cifs_ses->ses_lock		(anything that is not protected by another lock and can change)
2006  * cifs_ses->iface_lock		cifs_ses->iface_list		sesInfoAlloc
2007  *				->iface_count
2008  *				->iface_last_update
2009  * cifs_ses->chan_lock		cifs_ses->chans
2010  *				->chans_need_reconnect
2011  *				->chans_in_reconnect
2012  * cifs_tcon->tc_lock		(anything that is not protected by another lock and can change)
2013  * inode->i_rwsem, taken by fs/netfs/locking.c e.g. should be taken before cifsInodeInfo locks
2014  * cifsInodeInfo->open_file_lock	cifsInodeInfo->openFileList	cifs_alloc_inode
2015  * cifsInodeInfo->writers_lock	cifsInodeInfo->writers		cifsInodeInfo_alloc
2016  * cifsInodeInfo->lock_sem	cifsInodeInfo->llist		cifs_init_once
2017  *				->can_cache_brlcks
2018  * cifsInodeInfo->deferred_lock	cifsInodeInfo->deferred_closes	cifsInodeInfo_alloc
2019  * cached_fids->cfid_list_lock	cifs_tcon->cfids->entries	 init_cached_dirs
2020  * cifsFileInfo->fh_mutex		cifsFileInfo			cifs_new_fileinfo
2021  * cifsFileInfo->file_info_lock	cifsFileInfo->count		cifs_new_fileinfo
2022  *				->invalidHandle			initiate_cifs_search
2023  *				->oplock_break_cancelled
2043  * tcp session, and the list of tcon's per smb session. It also protects
2044  * the reference counters for the server, smb session, and tcon.
2046  * tcon->open_file_lock and that before file->file_info_lock since the
2047  * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
2084 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */
2085 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */
2162 	return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0;  in is_smb1_server()
2165 static inline bool is_tcon_dfs(struct cifs_tcon *tcon)  in is_tcon_dfs()  argument
2168 	 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS  in is_tcon_dfs()
2171 	 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server  in is_tcon_dfs()
2174 	if (!tcon || !tcon->ses || !tcon->ses->server)  in is_tcon_dfs()
2176 	return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS :  in is_tcon_dfs()
2177 		tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT);  in is_tcon_dfs()
2180 static inline bool cifs_is_referral_server(struct cifs_tcon *tcon,  in cifs_is_referral_server()  argument
2185 	 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL.  in cifs_is_referral_server()
2187 	return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER));  in cifs_is_referral_server()
2192 	return (u64)fl->fl_end - fl->fl_start + 1;  in cifs_flock_len()
2197 	if (WARN_ON_ONCE(!ses || !ses->server))  in ntlmssp_workstation_name_size()
2203 	if (ses->server->dialect <= SMB20_PROT_ID)  in ntlmssp_workstation_name_size()
2204 		return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL);  in ntlmssp_workstation_name_size()
2205 	return sizeof(ses->workstation_name);  in ntlmssp_workstation_name_size()
2210 	memcpy(dst, src, (size_t)((u8 *)&src->EASize - (u8 *)src));  in move_cifs_info_to_smb2()
2211 	dst->IndexNumber = 0;  in move_cifs_info_to_smb2()
2212 	dst->EASize = src->EASize;  in move_cifs_info_to_smb2()
2213 	dst->AccessFlags = 0;  in move_cifs_info_to_smb2()
2214 	dst->CurrentByteOffset = 0;  in move_cifs_info_to_smb2()
2215 	dst->Mode = 0;  in move_cifs_info_to_smb2()
2216 	dst->AlignmentRequirement = 0;  in move_cifs_info_to_smb2()
2217 	dst->FileNameLength = src->FileNameLength;  in move_cifs_info_to_smb2()
2247 		 * Instead, we convert to a BVEC-type iterator higher up.  in cifs_get_num_sgs()
2251 			return -EIO;  in cifs_get_num_sgs()
2258 			return -EIO;  in cifs_get_num_sgs()
2263 			addr = (unsigned long)iov->iov_base + skip;  in cifs_get_num_sgs()
2265 				len = iov->iov_len - skip;  in cifs_get_num_sgs()
2293 			unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off);  in cifs_sg_set_buf()
2295 			sg_set_page(&sgtable->sgl[sgtable->nents++],  in cifs_sg_set_buf()
2300 			buflen -= len;  in cifs_sg_set_buf()
2303 		sg_set_page(&sgtable->sgl[sgtable->nents++],  in cifs_sg_set_buf()
2310 		.tcon = _tcon, \
2337 	spin_lock(&ses->ses_lock);  in cifs_ses_exiting()
2338 	ret = ses->ses_status == SES_EXITING;  in cifs_ses_exiting()
2339 	spin_unlock(&ses->ses_lock);  in cifs_ses_exiting()