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linux/fs/ksmbd/ksmbd_netlink.h
Namjae Jeon 0d0d4680db ksmbd: add max connections parameter 
Add max connections parameter to limit number of maximum simultaneous
connections.

Fixes: 0626e6641f ("cifsd: add server handler for central processing and tranport layers")
Cc: stable@vger.kernel.org
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
2023-01-20 15:27:48 -06:00

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*
* linux-ksmbd-devel@lists.sourceforge.net
*/
#ifndef _LINUX_KSMBD_SERVER_H
#define _LINUX_KSMBD_SERVER_H
#include <linux/types.h>
/*
* This is a userspace ABI to communicate data between ksmbd and user IPC
* daemon using netlink. This is added to track and cache user account DB
* and share configuration info from userspace.
*
* - KSMBD_EVENT_HEARTBEAT_REQUEST(ksmbd_heartbeat)
* This event is to check whether user IPC daemon is alive. If user IPC
* daemon is dead, ksmbd keep existing connection till disconnecting and
* new connection will be denied.
*
* - KSMBD_EVENT_STARTING_UP(ksmbd_startup_request)
* This event is to receive the information that initializes the ksmbd
* server from the user IPC daemon and to start the server. The global
* section parameters are given from smb.conf as initialization
* information.
*
* - KSMBD_EVENT_SHUTTING_DOWN(ksmbd_shutdown_request)
* This event is to shutdown ksmbd server.
*
* - KSMBD_EVENT_LOGIN_REQUEST/RESPONSE(ksmbd_login_request/response)
* This event is to get user account info to user IPC daemon.
*
* - KSMBD_EVENT_SHARE_CONFIG_REQUEST/RESPONSE(ksmbd_share_config_request/response)
* This event is to get net share configuration info.
*
* - KSMBD_EVENT_TREE_CONNECT_REQUEST/RESPONSE(ksmbd_tree_connect_request/response)
* This event is to get session and tree connect info.
*
* - KSMBD_EVENT_TREE_DISCONNECT_REQUEST(ksmbd_tree_disconnect_request)
* This event is to send tree disconnect info to user IPC daemon.
*
* - KSMBD_EVENT_LOGOUT_REQUEST(ksmbd_logout_request)
* This event is to send logout request to user IPC daemon.
*
* - KSMBD_EVENT_RPC_REQUEST/RESPONSE(ksmbd_rpc_command)
* This event is to make DCE/RPC request like srvsvc, wkssvc, lsarpc,
* samr to be processed in userspace.
*
* - KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST/RESPONSE(ksmbd_spnego_authen_request/response)
* This event is to make kerberos authentication to be processed in
* userspace.
*/
#define KSMBD_GENL_NAME "SMBD_GENL"
#define KSMBD_GENL_VERSION 0x01
#define KSMBD_REQ_MAX_ACCOUNT_NAME_SZ 48
#define KSMBD_REQ_MAX_HASH_SZ 18
#define KSMBD_REQ_MAX_SHARE_NAME 64
/*
* IPC heartbeat frame to check whether user IPC daemon is alive.
*/
struct ksmbd_heartbeat {
__u32 handle;
};
/*
* Global config flags.
*/
#define KSMBD_GLOBAL_FLAG_INVALID (0)
#define KSMBD_GLOBAL_FLAG_SMB2_LEASES BIT(0)
#define KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION BIT(1)
#define KSMBD_GLOBAL_FLAG_SMB3_MULTICHANNEL BIT(2)
#define KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION_OFF BIT(3)
/*
* IPC request for ksmbd server startup
*/
struct ksmbd_startup_request {
__u32 flags; /* Flags for global config */
__s32 signing; /* Signing enabled */
__s8 min_prot[16]; /* The minimum SMB protocol version */
__s8 max_prot[16]; /* The maximum SMB protocol version */
__s8 netbios_name[16];
__s8 work_group[64]; /* Workgroup */
__s8 server_string[64]; /* Server string */
__u16 tcp_port; /* tcp port */
__u16 ipc_timeout; /*
* specifies the number of seconds
* server will wait for the userspace to
* reply to heartbeat frames.
*/
__u32 deadtime; /* Number of minutes of inactivity */
__u32 file_max; /* Limits the maximum number of open files */
__u32 smb2_max_write; /* MAX write size */
__u32 smb2_max_read; /* MAX read size */
__u32 smb2_max_trans; /* MAX trans size */
__u32 share_fake_fscaps; /*
* Support some special application that
* makes QFSINFO calls to check whether
* we set the SPARSE_FILES bit (0x40).
*/
__u32 sub_auth[3]; /* Subauth value for Security ID */
__u32 smb2_max_credits; /* MAX credits */
__u32 smbd_max_io_size; /* smbd read write size */
__u32 max_connections; /* Number of maximum simultaneous connections */
__u32 reserved[126]; /* Reserved room */
__u32 ifc_list_sz; /* interfaces list size */
__s8 ____payload[];
};
#define KSMBD_STARTUP_CONFIG_INTERFACES(s) ((s)->____payload)
/*
* IPC request to shutdown ksmbd server.
*/
struct ksmbd_shutdown_request {
__s32 reserved[16];
};
/*
* IPC user login request.
*/
struct ksmbd_login_request {
__u32 handle;
__s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ]; /* user account name */
__u32 reserved[16]; /* Reserved room */
};
/*
* IPC user login response.
*/
struct ksmbd_login_response {
__u32 handle;
__u32 gid; /* group id */
__u32 uid; /* user id */
__s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ]; /* user account name */
__u16 status;
__u16 hash_sz; /* hash size */
__s8 hash[KSMBD_REQ_MAX_HASH_SZ]; /* password hash */
__u32 reserved[16]; /* Reserved room */
};
/*
* IPC request to fetch net share config.
*/
struct ksmbd_share_config_request {
__u32 handle;
__s8 share_name[KSMBD_REQ_MAX_SHARE_NAME]; /* share name */
__u32 reserved[16]; /* Reserved room */
};
/*
* IPC response to the net share config request.
*/
struct ksmbd_share_config_response {
__u32 handle;
__u32 flags;
__u16 create_mask;
__u16 directory_mask;
__u16 force_create_mode;
__u16 force_directory_mode;
__u16 force_uid;
__u16 force_gid;
__s8 share_name[KSMBD_REQ_MAX_SHARE_NAME];
__u32 reserved[112]; /* Reserved room */
__u32 veto_list_sz;
__s8 ____payload[];
};
#define KSMBD_SHARE_CONFIG_VETO_LIST(s) ((s)->____payload)
static inline char *
ksmbd_share_config_path(struct ksmbd_share_config_response *sc)
{
char *p = sc->____payload;
if (sc->veto_list_sz)
p += sc->veto_list_sz + 1;
return p;
}
/*
* IPC request for tree connection. This request include session and tree
* connect info from client.
*/
struct ksmbd_tree_connect_request {
__u32 handle;
__u16 account_flags;
__u16 flags;
__u64 session_id;
__u64 connect_id;
__s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ];
__s8 share[KSMBD_REQ_MAX_SHARE_NAME];
__s8 peer_addr[64];
__u32 reserved[16]; /* Reserved room */
};
/*
* IPC Response structure for tree connection.
*/
struct ksmbd_tree_connect_response {
__u32 handle;
__u16 status;
__u16 connection_flags;
__u32 reserved[16]; /* Reserved room */
};
/*
* IPC Request struture to disconnect tree connection.
*/
struct ksmbd_tree_disconnect_request {
__u64 session_id; /* session id */
__u64 connect_id; /* tree connection id */
__u32 reserved[16]; /* Reserved room */
};
/*
* IPC Response structure to logout user account.
*/
struct ksmbd_logout_request {
__s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ]; /* user account name */
__u32 account_flags;
__u32 reserved[16]; /* Reserved room */
};
/*
* RPC command structure to send rpc request like srvsvc or wkssvc to
* IPC user daemon.
*/
struct ksmbd_rpc_command {
__u32 handle;
__u32 flags;
__u32 payload_sz;
__u8 payload[];
};
/*
* IPC Request Kerberos authentication
*/
struct ksmbd_spnego_authen_request {
__u32 handle;
__u16 spnego_blob_len; /* the length of spnego_blob */
__u8 spnego_blob[]; /*
* the GSS token from SecurityBuffer of
* SMB2 SESSION SETUP request
*/
};
/*
* Response data which includes the GSS token and the session key generated by
* user daemon.
*/
struct ksmbd_spnego_authen_response {
__u32 handle;
struct ksmbd_login_response login_response; /*
* the login response with
* a user identified by the
* GSS token from a client
*/
__u16 session_key_len; /* the length of the session key */
__u16 spnego_blob_len; /*
* the length of the GSS token which will be
* stored in SecurityBuffer of SMB2 SESSION
* SETUP response
*/
__u8 payload[]; /* session key + AP_REP */
};
/*
* This also used as NETLINK attribute type value.
*
* NOTE:
* Response message type value should be equal to
* request message type value + 1.
*/
enum ksmbd_event {
KSMBD_EVENT_UNSPEC = 0,
KSMBD_EVENT_HEARTBEAT_REQUEST,
KSMBD_EVENT_STARTING_UP,
KSMBD_EVENT_SHUTTING_DOWN,
KSMBD_EVENT_LOGIN_REQUEST,
KSMBD_EVENT_LOGIN_RESPONSE = 5,
KSMBD_EVENT_SHARE_CONFIG_REQUEST,
KSMBD_EVENT_SHARE_CONFIG_RESPONSE,
KSMBD_EVENT_TREE_CONNECT_REQUEST,
KSMBD_EVENT_TREE_CONNECT_RESPONSE,
KSMBD_EVENT_TREE_DISCONNECT_REQUEST = 10,
KSMBD_EVENT_LOGOUT_REQUEST,
KSMBD_EVENT_RPC_REQUEST,
KSMBD_EVENT_RPC_RESPONSE,
KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST,
KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE = 15,
KSMBD_EVENT_MAX
};
/*
* Enumeration for IPC tree connect status.
*/
enum KSMBD_TREE_CONN_STATUS {
KSMBD_TREE_CONN_STATUS_OK = 0,
KSMBD_TREE_CONN_STATUS_NOMEM,
KSMBD_TREE_CONN_STATUS_NO_SHARE,
KSMBD_TREE_CONN_STATUS_NO_USER,
KSMBD_TREE_CONN_STATUS_INVALID_USER,
KSMBD_TREE_CONN_STATUS_HOST_DENIED = 5,
KSMBD_TREE_CONN_STATUS_CONN_EXIST,
KSMBD_TREE_CONN_STATUS_TOO_MANY_CONNS,
KSMBD_TREE_CONN_STATUS_TOO_MANY_SESSIONS,
KSMBD_TREE_CONN_STATUS_ERROR,
};
/*
* User config flags.
*/
#define KSMBD_USER_FLAG_INVALID (0)
#define KSMBD_USER_FLAG_OK BIT(0)
#define KSMBD_USER_FLAG_BAD_PASSWORD BIT(1)
#define KSMBD_USER_FLAG_BAD_UID BIT(2)
#define KSMBD_USER_FLAG_BAD_USER BIT(3)
#define KSMBD_USER_FLAG_GUEST_ACCOUNT BIT(4)
#define KSMBD_USER_FLAG_DELAY_SESSION BIT(5)
/*
* Share config flags.
*/
#define KSMBD_SHARE_FLAG_INVALID (0)
#define KSMBD_SHARE_FLAG_AVAILABLE BIT(0)
#define KSMBD_SHARE_FLAG_BROWSEABLE BIT(1)
#define KSMBD_SHARE_FLAG_WRITEABLE BIT(2)
#define KSMBD_SHARE_FLAG_READONLY BIT(3)
#define KSMBD_SHARE_FLAG_GUEST_OK BIT(4)
#define KSMBD_SHARE_FLAG_GUEST_ONLY BIT(5)
#define KSMBD_SHARE_FLAG_STORE_DOS_ATTRS BIT(6)
#define KSMBD_SHARE_FLAG_OPLOCKS BIT(7)
#define KSMBD_SHARE_FLAG_PIPE BIT(8)
#define KSMBD_SHARE_FLAG_HIDE_DOT_FILES BIT(9)
#define KSMBD_SHARE_FLAG_INHERIT_OWNER BIT(10)
#define KSMBD_SHARE_FLAG_STREAMS BIT(11)
#define KSMBD_SHARE_FLAG_FOLLOW_SYMLINKS BIT(12)
#define KSMBD_SHARE_FLAG_ACL_XATTR BIT(13)
#define KSMBD_SHARE_FLAG_UPDATE BIT(14)
/*
* Tree connect request flags.
*/
#define KSMBD_TREE_CONN_FLAG_REQUEST_SMB1 (0)
#define KSMBD_TREE_CONN_FLAG_REQUEST_IPV6 BIT(0)
#define KSMBD_TREE_CONN_FLAG_REQUEST_SMB2 BIT(1)
/*
* Tree connect flags.
*/
#define KSMBD_TREE_CONN_FLAG_GUEST_ACCOUNT BIT(0)
#define KSMBD_TREE_CONN_FLAG_READ_ONLY BIT(1)
#define KSMBD_TREE_CONN_FLAG_WRITABLE BIT(2)
#define KSMBD_TREE_CONN_FLAG_ADMIN_ACCOUNT BIT(3)
#define KSMBD_TREE_CONN_FLAG_UPDATE BIT(4)
/*
* RPC over IPC.
*/
#define KSMBD_RPC_METHOD_RETURN BIT(0)
#define KSMBD_RPC_SRVSVC_METHOD_INVOKE BIT(1)
#define KSMBD_RPC_SRVSVC_METHOD_RETURN (KSMBD_RPC_SRVSVC_METHOD_INVOKE | KSMBD_RPC_METHOD_RETURN)
#define KSMBD_RPC_WKSSVC_METHOD_INVOKE BIT(2)
#define KSMBD_RPC_WKSSVC_METHOD_RETURN (KSMBD_RPC_WKSSVC_METHOD_INVOKE | KSMBD_RPC_METHOD_RETURN)
#define KSMBD_RPC_IOCTL_METHOD (BIT(3) | KSMBD_RPC_METHOD_RETURN)
#define KSMBD_RPC_OPEN_METHOD BIT(4)
#define KSMBD_RPC_WRITE_METHOD BIT(5)
#define KSMBD_RPC_READ_METHOD (BIT(6) | KSMBD_RPC_METHOD_RETURN)
#define KSMBD_RPC_CLOSE_METHOD BIT(7)
#define KSMBD_RPC_RAP_METHOD (BIT(8) | KSMBD_RPC_METHOD_RETURN)
#define KSMBD_RPC_RESTRICTED_CONTEXT BIT(9)
#define KSMBD_RPC_SAMR_METHOD_INVOKE BIT(10)
#define KSMBD_RPC_SAMR_METHOD_RETURN (KSMBD_RPC_SAMR_METHOD_INVOKE | KSMBD_RPC_METHOD_RETURN)
#define KSMBD_RPC_LSARPC_METHOD_INVOKE BIT(11)
#define KSMBD_RPC_LSARPC_METHOD_RETURN (KSMBD_RPC_LSARPC_METHOD_INVOKE | KSMBD_RPC_METHOD_RETURN)
/*
* RPC status definitions.
*/
#define KSMBD_RPC_OK 0
#define KSMBD_RPC_EBAD_FUNC 0x00000001
#define KSMBD_RPC_EACCESS_DENIED 0x00000005
#define KSMBD_RPC_EBAD_FID 0x00000006
#define KSMBD_RPC_ENOMEM 0x00000008
#define KSMBD_RPC_EBAD_DATA 0x0000000D
#define KSMBD_RPC_ENOTIMPLEMENTED 0x00000040
#define KSMBD_RPC_EINVALID_PARAMETER 0x00000057
#define KSMBD_RPC_EMORE_DATA 0x000000EA
#define KSMBD_RPC_EINVALID_LEVEL 0x0000007C
#define KSMBD_RPC_SOME_NOT_MAPPED 0x00000107
#define KSMBD_CONFIG_OPT_DISABLED 0
#define KSMBD_CONFIG_OPT_ENABLED 1
#define KSMBD_CONFIG_OPT_AUTO 2
#define KSMBD_CONFIG_OPT_MANDATORY 3
#endif /* _LINUX_KSMBD_SERVER_H */
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