NAT64#

otNat64DropReason#

otNat64DropReason

Packet drop reasons.

otNat64State#

otNat64State

States of NAT64.

otIp4Address#

typedef struct otIp4Address otIp4Address

Represents an IPv4 address.

otIp4Cidr#

typedef struct otIp4Cidr otIp4Cidr

otNat64Counters#

typedef struct otNat64Counters otNat64Counters

Represents the counters for NAT64.

otNat64ProtocolCounters#

typedef struct otNat64ProtocolCounters otNat64ProtocolCounters

Represents the counters for the protocols supported by NAT64.

otNat64DropReason#

typedef enum otNat64DropReason otNat64DropReason

Packet drop reasons.

otNat64ErrorCounters#

typedef struct otNat64ErrorCounters otNat64ErrorCounters

Represents the counters of dropped packets due to errors when handling NAT64 packets.

otNat64AddressMapping#

typedef struct otNat64AddressMapping otNat64AddressMapping

Represents an address mapping record for NAT64.

Note

• The counters will be reset for each mapping session even for the same address pair. Applications can use mId to identify different sessions to calculate the packets correctly.

otNat64AddressMappingIterator#

typedef struct otNat64AddressMappingIterator otNat64AddressMappingIterator

Used to iterate through NAT64 address mappings.

The fields in this type are opaque (intended for use by OpenThread core only) and therefore should not be accessed or used by caller.

Before using an iterator, it MUST be initialized using otNat64AddressMappingIteratorInit().

otNat64ReceiveIp4Callback#

typedef void(* otNat64ReceiveIp4Callback) (otMessage *aMessage, void *aContext) )(otMessage *aMessage, void *aContext)

Pointer is called when an IPv4 datagram (translated by NAT64 translator) is received.

OT_TOOL_PACKED_END#

OT_TOOL_PACKED_BEGIN struct otIp4Address OT_TOOL_PACKED_END

otNat64GetCounters#

void otNat64GetCounters (otInstance * aInstance, otNat64ProtocolCounters * aCounters)

Gets NAT64 translator counters.

The counter is counted since the instance initialized.

Available when OPENTHREAD_CONFIG_NAT64_TRANSLATOR_ENABLE is enabled.

otNat64GetErrorCounters#

void otNat64GetErrorCounters (otInstance * aInstance, otNat64ErrorCounters * aCounters)

Gets the NAT64 translator error counters.

The counters are initialized to zero when the OpenThread instance is initialized.

otNat64InitAddressMappingIterator#

void otNat64InitAddressMappingIterator (otInstance * aInstance, otNat64AddressMappingIterator * aIterator)

Initializes an otNat64AddressMappingIterator.

An iterator MUST be initialized before it is used.

An iterator can be initialized again to restart from the beginning of the mapping info.

otNat64GetNextAddressMapping#

otError otNat64GetNextAddressMapping (otInstance * aInstance, otNat64AddressMappingIterator * aIterator, otNat64AddressMapping * aMapping)

Gets the next AddressMapping info (using an iterator).

Available when OPENTHREAD_CONFIG_NAT64_TRANSLATOR_ENABLE is enabled.

otNat64GetTranslatorState#

otNat64State otNat64GetTranslatorState (otInstance * aInstance)

Gets the state of NAT64 translator.

Available when OPENTHREAD_CONFIG_NAT64_TRANSLATOR_ENABLE is enabled.

otNat64GetPrefixManagerState#

otNat64State otNat64GetPrefixManagerState (otInstance * aInstance)

Gets the state of NAT64 prefix manager.

Available when OPENTHREAD_CONFIG_NAT64_BORDER_ROUTING_ENABLE is enabled.

otNat64SetEnabled#

void otNat64SetEnabled (otInstance * aInstance, bool aEnabled)

Enable or disable NAT64 functions.

Note: This includes the NAT64 Translator (when OPENTHREAD_CONFIG_NAT64_TRANSLATOR_ENABLE is enabled) and the NAT64 Prefix Manager (when OPENTHREAD_CONFIG_NAT64_BORDER_ROUTING_ENABLE is enabled).

When OPENTHREAD_CONFIG_NAT64_TRANSLATOR_ENABLE is enabled, setting disabled to true resets the mapping table in the translator.

Available when OPENTHREAD_CONFIG_NAT64_TRANSLATOR_ENABLE or OPENTHREAD_CONFIG_NAT64_BORDER_ROUTING_ENABLE is enabled.

See Also

• otNat64GetTranslatorState

• otNat64GetPrefixManagerState

otIp4NewMessage#

otMessage * otIp4NewMessage (otInstance * aInstance, const otMessageSettings * aSettings)

Allocate a new message buffer for sending an IPv4 message to the NAT64 translator.

Message buffers allocated by this function will have 20 bytes (difference between the size of IPv6 headers and IPv4 header sizes) reserved.

Available when OPENTHREAD_CONFIG_NAT64_TRANSLATOR_ENABLE is enabled.

Note

• If aSettings is NULL, the link layer security is enabled and the message priority is set to OT_MESSAGE_PRIORITY_NORMAL by default.

Returns

• A pointer to the message buffer or NULL if no message buffers are available or parameters are invalid.

See Also

• otNat64Send

otNat64SetIp4Cidr#

otError otNat64SetIp4Cidr (otInstance * aInstance, const otIp4Cidr * aCidr)

Sets the CIDR used when setting the source address of the outgoing translated IPv4 packets.

Is available only when OPENTHREAD_CONFIG_NAT64_TRANSLATOR_ENABLE is enabled.

Note

• A valid CIDR must have a non-zero prefix length. The actual addresses pool is limited by the size of the mapping pool and the number of addresses available in the CIDR block.

• This function can be called at any time, but the NAT64 translator will be reset and all existing sessions will be expired when updating the configured CIDR.

See Also

• otBorderRouterSend

• otBorderRouterSetReceiveCallback

otNat64Send#

otError otNat64Send (otInstance * aInstance, otMessage * aMessage)

Translates an IPv4 datagram to an IPv6 datagram and sends via the Thread interface.

The caller transfers ownership of aMessage when making this call. OpenThread will free aMessage when processing is complete, including when a value other than OT_ERROR_NONE is returned.

otNat64SetReceiveIp4Callback#

void otNat64SetReceiveIp4Callback (otInstance * aInstance, otNat64ReceiveIp4Callback aCallback, void * aContext)

Registers a callback to provide received IPv4 datagrams.

otNat64GetCidr#

otError otNat64GetCidr (otInstance * aInstance, otIp4Cidr * aCidr)

Gets the IPv4 CIDR configured in the NAT64 translator.

Available when OPENTHREAD_CONFIG_NAT64_TRANSLATOR_ENABLE is enabled.

otIp4IsAddressEqual#

bool otIp4IsAddressEqual (const otIp4Address * aFirst, const otIp4Address * aSecond)

Test if two IPv4 addresses are the same.

otIp4ExtractFromIp6Address#

void otIp4ExtractFromIp6Address (uint8_t aPrefixLength, const otIp6Address * aIp6Address, otIp4Address * aIp4Address)

Set aIp4Address by performing NAT64 address translation from aIp6Address as specified in RFC 6052.

The NAT64 aPrefixLength MUST be one of the following values: 32, 40, 48, 56, 64, or 96, otherwise the behavior of this method is undefined.

otIp4FromIp4MappedIp6Address#

otError otIp4FromIp4MappedIp6Address (const otIp6Address * aIp6Address, otIp4Address * aIp4Address)

Extracts the IPv4 address from a given IPv4-mapped IPv6 address.

An IPv4-mapped IPv6 address consists of an 80-bit prefix of zeros, the next 16 bits set to ones, and the remaining, least-significant 32 bits contain the IPv4 address, e.g., ::ffff:192.0.2.128 representing 192.0.2.128.

otIp4ToIp4MappedIp6Address#

void otIp4ToIp4MappedIp6Address (const otIp4Address * aIp4Address, otIp6Address * aIp6Address)

Converts a given IP4 address to an IPv6 address following the IPv4-mapped IPv6 address format.

otIp4AddressToString#

void otIp4AddressToString (const otIp4Address * aAddress, char * aBuffer, uint16_t aSize)

Converts the address to a string.

The string format uses quad-dotted notation of four bytes in the address (e.g., "127.0.0.1").

If the resulting string does not fit in aBuffer (within its aSize characters), the string will be truncated but the outputted string is always null-terminated.

otIp4CidrFromString#

otError otIp4CidrFromString (const char * aString, otIp4Cidr * aCidr)

Converts a human-readable IPv4 CIDR string into a binary representation.

otIp4CidrToString#

void otIp4CidrToString (const otIp4Cidr * aCidr, char * aBuffer, uint16_t aSize)

Converts the IPv4 CIDR to a string.

The string format uses quad-dotted notation of four bytes in the address with the length of prefix (e.g., "127.0.0.1/32").

If the resulting string does not fit in aBuffer (within its aSize characters), the string will be truncated but the outputted string is always null-terminated.

otIp4AddressFromString#

otError otIp4AddressFromString (const char * aString, otIp4Address * aAddress)

Converts a human-readable IPv4 address string into a binary representation.

otNat64SynthesizeIp6Address#

otError otNat64SynthesizeIp6Address (otInstance * aInstance, const otIp4Address * aIp4Address, otIp6Address * aIp6Address)

Sets the IPv6 address by performing NAT64 address translation from the preferred NAT64 prefix and the given IPv4 address as specified in RFC 6052.

Returns

• OT_ERROR_NONE Successfully synthesized the IPv6 address from NAT64 prefix and IPv4 address.

• OT_ERROR_INVALID_STATE No valid NAT64 prefix in the network data.

OT_IP4_ADDRESS_SIZE#

#define OT_IP4_ADDRESS_SIZE

4

Size of an IPv4 address (bytes)

OT_IP4_ADDRESS_STRING_SIZE#

#define OT_IP4_ADDRESS_STRING_SIZE

17

Length of 000.000.000.000 plus a suffix NUL.

OT_IP4_CIDR_STRING_SIZE#

#define OT_IP4_CIDR_STRING_SIZE

20

Length of 000.000.000.000/00 plus a suffix NUL.