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ZeroTierOne.h
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ZeroTierOne.h
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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* This defines the external C API for ZeroTier's core network virtualization
* engine.
*/
#ifndef ZT_ZEROTIERONE_H
#define ZT_ZEROTIERONE_H
#include <stdint.h>
// For the struct sockaddr_storage structure
#if defined(_WIN32) || defined(_WIN64)
#include <WinSock2.h>
#include <WS2tcpip.h>
#include <Windows.h>
#else /* not Windows */
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#endif /* Windows or not */
#ifdef __cplusplus
extern "C" {
#endif
/****************************************************************************/
/* Core constants */
/****************************************************************************/
/**
* Default UDP port for devices running a ZeroTier endpoint
*/
#define ZT_DEFAULT_PORT 9993
/**
* Maximum MTU for ZeroTier virtual networks
*
* This is pretty much an unchangeable global constant. To make it change
* across nodes would require logic to send ICMP packet too big messages,
* which would complicate things. 1500 has been good enough on most LANs
* for ages, so a larger MTU should be fine for the forseeable future. This
* typically results in two UDP packets per single large frame. Experimental
* results seem to show that this is good. Larger MTUs resulting in more
* fragments seemed too brittle on slow/crummy links for no benefit.
*
* If this does change, also change it in tap.h in the tuntaposx code under
* mac-tap.
*
* Overhead for a normal frame split into two packets:
*
* 1414 = 1444 (typical UDP MTU) - 28 (packet header) - 2 (ethertype)
* 1428 = 1444 (typical UDP MTU) - 16 (fragment header)
* SUM: 2842
*
* We use 2800, which leaves some room for other payload in other types of
* messages such as multicast propagation or future support for bridging.
*/
#define ZT_MAX_MTU 2800
/**
* Maximum length of network short name
*/
#define ZT_MAX_NETWORK_SHORT_NAME_LENGTH 127
/**
* Maximum number of pushed routes on a network
*/
#define ZT_MAX_NETWORK_ROUTES 32
/**
* Maximum number of statically assigned IP addresses per network endpoint using ZT address management (not DHCP)
*/
#define ZT_MAX_ZT_ASSIGNED_ADDRESSES 16
/**
* Maximum number of "specialists" on a network -- bridges, relays, etc.
*/
#define ZT_MAX_NETWORK_SPECIALISTS 256
/**
* Maximum number of static physical to ZeroTier address mappings (typically relays, etc.)
*/
#define ZT_MAX_NETWORK_PINNED 16
/**
* Maximum number of rule table entries per network (can be increased)
*/
#define ZT_MAX_NETWORK_RULES 256
/**
* Maximum number of multicast group subscriptions per network
*/
#define ZT_MAX_NETWORK_MULTICAST_SUBSCRIPTIONS 4096
/**
* Maximum number of direct network paths to a given peer
*/
#define ZT_MAX_PEER_NETWORK_PATHS 4
/**
* Maximum number of trusted physical network paths
*/
#define ZT_MAX_TRUSTED_PATHS 16
/**
* Maximum number of hops in a ZeroTier circuit test
*
* This is more or less the max that can be fit in a given packet (with
* fragmentation) and only one address per hop.
*/
#define ZT_CIRCUIT_TEST_MAX_HOPS 256
/**
* Maximum number of addresses per hop in a circuit test
*/
#define ZT_CIRCUIT_TEST_MAX_HOP_BREADTH 8
/**
* Maximum number of cluster members (and max member ID plus one)
*/
#define ZT_CLUSTER_MAX_MEMBERS 128
/**
* Maximum number of physical ZeroTier addresses a cluster member can report
*/
#define ZT_CLUSTER_MAX_ZT_PHYSICAL_ADDRESSES 16
/**
* Maximum allowed cluster message length in bytes
*/
#define ZT_CLUSTER_MAX_MESSAGE_LENGTH (1500 - 48)
/**
* A null/empty sockaddr (all zero) to signify an unspecified socket address
*/
extern const struct sockaddr_storage ZT_SOCKADDR_NULL;
/****************************************************************************/
/* Structures and other types */
/****************************************************************************/
/**
* Function return code: OK (0) or error results
*
* Use ZT_ResultCode_isFatal() to check for a fatal error. If a fatal error
* occurs, the node should be considered to not be working correctly. These
* indicate serious problems like an inaccessible data store or a compile
* problem.
*/
enum ZT_ResultCode
{
/**
* Operation completed normally
*/
ZT_RESULT_OK = 0,
// Fatal errors (>0, <1000)
/**
* Ran out of memory
*/
ZT_RESULT_FATAL_ERROR_OUT_OF_MEMORY = 1,
/**
* Data store is not writable or has failed
*/
ZT_RESULT_FATAL_ERROR_DATA_STORE_FAILED = 2,
/**
* Internal error (e.g. unexpected exception indicating bug or build problem)
*/
ZT_RESULT_FATAL_ERROR_INTERNAL = 3,
// Non-fatal errors (>1000)
/**
* Network ID not valid
*/
ZT_RESULT_ERROR_NETWORK_NOT_FOUND = 1000,
/**
* The requested operation is not supported on this version or build
*/
ZT_RESULT_ERROR_UNSUPPORTED_OPERATION = 1001,
/**
* The requestion operation was given a bad parameter or was called in an invalid state
*/
ZT_RESULT_ERROR_BAD_PARAMETER = 1002
};
/**
* @param x Result code
* @return True if result code indicates a fatal error
*/
#define ZT_ResultCode_isFatal(x) ((((int)(x)) > 0)&&(((int)(x)) < 1000))
/**
* Status codes sent to status update callback when things happen
*/
enum ZT_Event
{
/**
* Node has been initialized
*
* This is the first event generated, and is always sent. It may occur
* before Node's constructor returns.
*
* Meta-data: none
*/
ZT_EVENT_UP = 0,
/**
* Node is offline -- network does not seem to be reachable by any available strategy
*
* Meta-data: none
*/
ZT_EVENT_OFFLINE = 1,
/**
* Node is online -- at least one upstream node appears reachable
*
* Meta-data: none
*/
ZT_EVENT_ONLINE = 2,
/**
* Node is shutting down
*
* This is generated within Node's destructor when it is being shut down.
* It's done for convenience, since cleaning up other state in the event
* handler may appear more idiomatic.
*
* Meta-data: none
*/
ZT_EVENT_DOWN = 3,
/**
* Your identity has collided with another node's ZeroTier address
*
* This happens if two different public keys both hash (via the algorithm
* in Identity::generate()) to the same 40-bit ZeroTier address.
*
* This is something you should "never" see, where "never" is defined as
* once per 2^39 new node initializations / identity creations. If you do
* see it, you're going to see it very soon after a node is first
* initialized.
*
* This is reported as an event rather than a return code since it's
* detected asynchronously via error messages from authoritative nodes.
*
* If this occurs, you must shut down and delete the node, delete the
* identity.secret record/file from the data store, and restart to generate
* a new identity. If you don't do this, you will not be able to communicate
* with other nodes.
*
* We'd automate this process, but we don't think silently deleting
* private keys or changing our address without telling the calling code
* is good form. It violates the principle of least surprise.
*
* You can technically get away with not handling this, but we recommend
* doing so in a mature reliable application. Besides, handling this
* condition is a good way to make sure it never arises. It's like how
* umbrellas prevent rain and smoke detectors prevent fires. They do, right?
*
* Meta-data: none
*/
ZT_EVENT_FATAL_ERROR_IDENTITY_COLLISION = 4,
/**
* Trace (debugging) message
*
* These events are only generated if this is a TRACE-enabled build.
*
* Meta-data: C string, TRACE message
*/
ZT_EVENT_TRACE = 5
};
/**
* Current node status
*/
typedef struct
{
/**
* 40-bit ZeroTier address of this node
*/
uint64_t address;
/**
* Current world ID
*/
uint64_t worldId;
/**
* Current world revision/timestamp
*/
uint64_t worldTimestamp;
/**
* Public identity in string-serialized form (safe to send to others)
*
* This pointer will remain valid as long as the node exists.
*/
const char *publicIdentity;
/**
* Full identity including secret key in string-serialized form
*
* This pointer will remain valid as long as the node exists.
*/
const char *secretIdentity;
/**
* True if some kind of connectivity appears available
*/
int online;
} ZT_NodeStatus;
/**
* Virtual network status codes
*/
enum ZT_VirtualNetworkStatus
{
/**
* Waiting for network configuration (also means revision == 0)
*/
ZT_NETWORK_STATUS_REQUESTING_CONFIGURATION = 0,
/**
* Configuration received and we are authorized
*/
ZT_NETWORK_STATUS_OK = 1,
/**
* Netconf master told us 'nope'
*/
ZT_NETWORK_STATUS_ACCESS_DENIED = 2,
/**
* Netconf master exists, but this virtual network does not
*/
ZT_NETWORK_STATUS_NOT_FOUND = 3,
/**
* Initialization of network failed or other internal error
*/
ZT_NETWORK_STATUS_PORT_ERROR = 4,
/**
* ZeroTier core version too old
*/
ZT_NETWORK_STATUS_CLIENT_TOO_OLD = 5
};
/**
* Virtual network type codes
*/
enum ZT_VirtualNetworkType
{
/**
* Private networks are authorized via certificates of membership
*/
ZT_NETWORK_TYPE_PRIVATE = 0,
/**
* Public networks have no access control -- they'll always be AUTHORIZED
*/
ZT_NETWORK_TYPE_PUBLIC = 1
};
/**
* The type of a virtual network rules table entry
*
* These must range from 0 to 127 (0x7f).
*
* Each rule is composed of one or more MATCHes followed by an ACTION.
*/
enum ZT_VirtualNetworkRuleType
{
/**
* Drop frame
*/
ZT_NETWORK_RULE_ACTION_DROP = 0,
/**
* Accept and pass frame
*/
ZT_NETWORK_RULE_ACTION_ACCEPT = 1,
/**
* Forward a copy of this frame to an observer
*/
ZT_NETWORK_RULE_ACTION_TEE = 2,
/**
* Explicitly redirect this frame to another device (ignored if this is the target device)
*/
ZT_NETWORK_RULE_ACTION_REDIRECT = 3,
// <32 == actions
/**
* Source ZeroTier address -- analogous to an Ethernet port ID on a switch
*/
ZT_NETWORK_RULE_MATCH_SOURCE_ZEROTIER_ADDRESS = 32,
/**
* Destination ZeroTier address -- analogous to an Ethernet port ID on a switch
*/
ZT_NETWORK_RULE_MATCH_DEST_ZEROTIER_ADDRESS = 33,
/**
* Ethernet VLAN ID
*/
ZT_NETWORK_RULE_MATCH_VLAN_ID = 34,
/**
* Ethernet VLAN PCP
*/
ZT_NETWORK_RULE_MATCH_VLAN_PCP = 35,
/**
* Ethernet VLAN DEI
*/
ZT_NETWORK_RULE_MATCH_VLAN_DEI = 36,
/**
* Ethernet frame type
*/
ZT_NETWORK_RULE_MATCH_ETHERTYPE = 37,
/**
* Source Ethernet MAC address
*/
ZT_NETWORK_RULE_MATCH_MAC_SOURCE = 38,
/**
* Destination Ethernet MAC address
*/
ZT_NETWORK_RULE_MATCH_MAC_DEST = 39,
/**
* Source IPv4 address
*/
ZT_NETWORK_RULE_MATCH_IPV4_SOURCE = 40,
/**
* Destination IPv4 address
*/
ZT_NETWORK_RULE_MATCH_IPV4_DEST = 41,
/**
* Source IPv6 address
*/
ZT_NETWORK_RULE_MATCH_IPV6_SOURCE = 42,
/**
* Destination IPv6 address
*/
ZT_NETWORK_RULE_MATCH_IPV6_DEST = 43,
/**
* IP TOS (type of service)
*/
ZT_NETWORK_RULE_MATCH_IP_TOS = 44,
/**
* IP protocol
*/
ZT_NETWORK_RULE_MATCH_IP_PROTOCOL = 45,
/**
* IP source port range (start-end, inclusive)
*/
ZT_NETWORK_RULE_MATCH_IP_SOURCE_PORT_RANGE = 46,
/**
* IP destination port range (start-end, inclusive)
*/
ZT_NETWORK_RULE_MATCH_IP_DEST_PORT_RANGE = 47,
/**
* Packet characteristics (set of flags)
*/
ZT_NETWORK_RULE_MATCH_CHARACTERISTICS = 48,
/**
* Frame size range (start-end, inclusive)
*/
ZT_NETWORK_RULE_MATCH_FRAME_SIZE_RANGE = 49,
/**
* Match a range of relative TCP sequence numbers (e.g. approx first N bytes of stream)
*/
ZT_NETWORK_RULE_MATCH_TCP_RELATIVE_SEQUENCE_NUMBER_RANGE = 50,
/**
* Match a certificate of network membership field from the ZT origin's COM: greater than or equal to
*/
ZT_NETWORK_RULE_MATCH_COM_FIELD_GE = 51,
/**
* Match a certificate of network membership field from the ZT origin's COM: less than or equal to
*/
ZT_NETWORK_RULE_MATCH_COM_FIELD_LE = 52
};
/**
* Network flow rule
*
* NOTE: Currently (1.1.x) only etherType is supported! Other things will
* have no effect until the rules engine is fully implemented.
*
* Rules are stored in a table in which one or more match entries is followed
* by an action. If more than one match precedes an action, the rule is
* the AND of all matches. An action with no match is always taken since it
* matches anything. If nothing matches, the default action is DROP.
*
* This is designed to be a more memory-efficient way of storing rules than
* a wide table, yet still fast and simple to access in code.
*/
typedef struct
{
/**
* Least significant 7 bits: ZT_VirtualNetworkRuleType, most significant 1 bit is NOT bit
*
* If the NOT bit is set, then matches will be interpreted as "does not
* match." The NOT bit has no effect on actions.
*
* Use "& 0x7f" to get the enum and "& 0x80" to get the NOT flag.
*
* The union 'v' is a variant type, and this selects which field in 'v' is
* actually used and valid.
*/
uint8_t t;
/**
* Union containing the value of this rule -- which field is used depends on 't'
*/
union {
/**
* IPv6 address in big-endian / network byte order and netmask bits
*/
struct {
uint8_t ip[16];
uint8_t mask;
} ipv6;
/**
* IPv4 address in big-endian / network byte order
*/
struct {
uint32_t ip;
uint8_t mask;
} ipv4;
/**
* Packet characteristic flags being matched
*/
uint64_t characteristics;
/**
* IP port range -- start-end inclusive -- host byte order
*/
uint16_t port[2];
/**
* TCP relative sequence number range -- start-end inclusive -- host byte order
*/
uint32_t tcpseq[2];
/**
* 40-bit ZeroTier address (in least significant bits, host byte order)
*/
uint64_t zt;
/**
* 48-bit Ethernet MAC address in big-endian order
*/
uint8_t mac[6];
/**
* VLAN ID in host byte order
*/
uint16_t vlanId;
/**
* VLAN PCP (least significant 3 bits)
*/
uint8_t vlanPcp;
/**
* VLAN DEI (single bit / boolean)
*/
uint8_t vlanDei;
/**
* Ethernet type in host byte order
*/
uint16_t etherType;
/**
* IP protocol
*/
uint8_t ipProtocol;
/**
* IP type of service
*/
uint8_t ipTos;
/**
* Ethernet packet size in host byte order (start-end, inclusive)
*/
uint16_t frameSize[2];
/**
* COM ID and value for ZT_NETWORK_RULE_MATCH_COM_FIELD_GE and ZT_NETWORK_RULE_MATCH_COM_FIELD_LE
*/
uint64_t comIV[2];
} v;
} ZT_VirtualNetworkRule;
/**
* A route to be pushed on a virtual network
*/
typedef struct
{
/**
* Target network / netmask bits (in port field) or NULL or 0.0.0.0/0 for default
*/
struct sockaddr_storage target;
/**
* Gateway IP address (port ignored) or NULL (family == 0) for LAN-local (no gateway)
*/
struct sockaddr_storage via;
/**
* Route flags
*/
uint16_t flags;
/**
* Route metric (not currently used)
*/
uint16_t metric;
} ZT_VirtualNetworkRoute;
/**
* An Ethernet multicast group
*/
typedef struct
{
/**
* MAC address (least significant 48 bits)
*/
uint64_t mac;
/**
* Additional distinguishing information (usually zero)
*/
unsigned long adi;
} ZT_MulticastGroup;
/**
* Virtual network configuration update type
*/
enum ZT_VirtualNetworkConfigOperation
{
/**
* Network is coming up (either for the first time or after service restart)
*/
ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_UP = 1,
/**
* Network configuration has been updated
*/
ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_CONFIG_UPDATE = 2,
/**
* Network is going down (not permanently)
*/
ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_DOWN = 3,
/**
* Network is going down permanently (leave/delete)
*/
ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_DESTROY = 4
};
/**
* What trust hierarchy role does this peer have?
*/
enum ZT_PeerRole {
ZT_PEER_ROLE_LEAF = 0, // ordinary node
ZT_PEER_ROLE_RELAY = 1, // relay node
ZT_PEER_ROLE_ROOT = 2 // root server
};
/**
* Vendor ID
*/
enum ZT_Vendor {
ZT_VENDOR_UNSPECIFIED = 0,
ZT_VENDOR_ZEROTIER = 1
};
/**
* Platform type
*/
enum ZT_Platform {
ZT_PLATFORM_UNSPECIFIED = 0,
ZT_PLATFORM_LINUX = 1,
ZT_PLATFORM_WINDOWS = 2,
ZT_PLATFORM_MACOS = 3,
ZT_PLATFORM_ANDROID = 4,
ZT_PLATFORM_IOS = 5,
ZT_PLATFORM_SOLARIS_SMARTOS = 6,
ZT_PLATFORM_FREEBSD = 7,
ZT_PLATFORM_NETBSD = 8,
ZT_PLATFORM_OPENBSD = 9,
ZT_PLATFORM_RISCOS = 10,
ZT_PLATFORM_VXWORKS = 11,
ZT_PLATFORM_FREERTOS = 12,
ZT_PLATFORM_SYSBIOS = 13,
ZT_PLATFORM_HURD = 14
};
/**
* Architecture type
*/
enum ZT_Architecture {
ZT_ARCHITECTURE_UNSPECIFIED = 0,
ZT_ARCHITECTURE_X86 = 1,
ZT_ARCHITECTURE_X64 = 2,
ZT_ARCHITECTURE_ARM32 = 3,
ZT_ARCHITECTURE_ARM64 = 4,
ZT_ARCHITECTURE_MIPS32 = 5,
ZT_ARCHITECTURE_MIPS64 = 6,
ZT_ARCHITECTURE_POWER32 = 7,
ZT_ARCHITECTURE_POWER64 = 8,
ZT_ARCHITECTURE_OPENRISC32 = 9,
ZT_ARCHITECTURE_OPENRISC64 = 10,
ZT_ARCHITECTURE_SPARC32 = 11,
ZT_ARCHITECTURE_SPARC64 = 12,
ZT_ARCHITECTURE_DOTNET_CLR = 13,
ZT_ARCHITECTURE_JAVA_JVM = 14
};
/**
* Virtual network configuration
*/
typedef struct
{
/**
* 64-bit ZeroTier network ID
*/
uint64_t nwid;
/**
* Ethernet MAC (48 bits) that should be assigned to port
*/
uint64_t mac;
/**
* Network name (from network configuration master)
*/
char name[ZT_MAX_NETWORK_SHORT_NAME_LENGTH + 1];
/**
* Network configuration request status
*/
enum ZT_VirtualNetworkStatus status;
/**
* Network type
*/
enum ZT_VirtualNetworkType type;
/**
* Maximum interface MTU
*/
unsigned int mtu;
/**
* If nonzero, the network this port belongs to indicates DHCP availability
*
* This is a suggestion. The underlying implementation is free to ignore it
* for security or other reasons. This is simply a netconf parameter that
* means 'DHCP is available on this network.'
*/
int dhcp;
/**
* If nonzero, this port is allowed to bridge to other networks
*
* This is informational. If this is false (0), bridged packets will simply
* be dropped and bridging won't work.
*/
int bridge;
/**
* If nonzero, this network supports and allows broadcast (ff:ff:ff:ff:ff:ff) traffic
*/
int broadcastEnabled;
/**
* If the network is in PORT_ERROR state, this is the (negative) error code most recently reported
*/
int portError;
/**
* Revision number as reported by controller or 0 if still waiting for config
*/
unsigned long netconfRevision;
/**
* Number of assigned addresses
*/
unsigned int assignedAddressCount;
/**
* ZeroTier-assigned addresses (in sockaddr_storage structures)
*
* For IP, the port number of the sockaddr_XX structure contains the number
* of bits in the address netmask. Only the IP address and port are used.
* Other fields like interface number can be ignored.
*
* This is only used for ZeroTier-managed address assignments sent by the
* virtual network's configuration master.
*/
struct sockaddr_storage assignedAddresses[ZT_MAX_ZT_ASSIGNED_ADDRESSES];
/**
* Number of ZT-pushed routes
*/
unsigned int routeCount;
/**
* Routes (excluding those implied by assigned addresses and their masks)
*/
ZT_VirtualNetworkRoute routes[ZT_MAX_NETWORK_ROUTES];
} ZT_VirtualNetworkConfig;
/**
* A list of networks
*/
typedef struct
{
ZT_VirtualNetworkConfig *networks;
unsigned long networkCount;
} ZT_VirtualNetworkList;
/**
* Physical network path to a peer
*/
typedef struct
{
/**
* Address of endpoint
*/
struct sockaddr_storage address;
/**
* Time of last send in milliseconds or 0 for never
*/
uint64_t lastSend;
/**
* Time of last receive in milliseconds or 0 for never
*/
uint64_t lastReceive;
/**
* Is this a trusted path? If so this will be its nonzero ID.
*/
uint64_t trustedPathId;
/**
* Is path active?
*/
int active;
/**
* Is path preferred?
*/
int preferred;
} ZT_PeerPhysicalPath;
/**
* Peer status result buffer
*/
typedef struct
{
/**
* ZeroTier address (40 bits)
*/
uint64_t address;
/**
* Time we last received a unicast frame from this peer
*/
uint64_t lastUnicastFrame;
/**
* Time we last received a multicast rame from this peer
*/
uint64_t lastMulticastFrame;
/**
* Remote major version or -1 if not known
*/
int versionMajor;
/**
* Remote minor version or -1 if not known
*/
int versionMinor;
/**
* Remote revision or -1 if not known
*/
int versionRev;
/**
* Last measured latency in milliseconds or zero if unknown
*/
unsigned int latency;
/**
* What trust hierarchy role does this device have?
*/
enum ZT_PeerRole role;
/**
* Number of paths (size of paths[])
*/
unsigned int pathCount;
/**
* Known network paths to peer
*/
ZT_PeerPhysicalPath paths[ZT_MAX_PEER_NETWORK_PATHS];
} ZT_Peer;
/**
* List of peers
*/
typedef struct
{
ZT_Peer *peers;
unsigned long peerCount;
} ZT_PeerList;
/**
* ZeroTier circuit test configuration and path
*/
typedef struct {
/**
* Test ID -- an arbitrary 64-bit identifier
*/
uint64_t testId;
/**
* Timestamp -- sent with test and echoed back by each reporter
*/
uint64_t timestamp;
/**
* Originator credential: network ID
*
* If this is nonzero, a network ID will be set for this test and
* the originator must be its primary network controller. This is
* currently the only authorization method available, so it must
* be set to run a test.
*/
uint64_t credentialNetworkId;
/**