LDN services

LDN handles all local network communication.

ldn:m

This is "nn::ldn::detail::IMonitorServiceCreator".

Cmd	Name
0	#CreateMonitorService

CreateMonitorService

Returns an #IMonitorService.

The user-process closes the IMonitorServiceCreator object immediately after using this cmd.

IMonitorService

This is "nn::ldn::detail::IMonitorService".

Cmd	Name
0	#GetStateForMonitor
1	#GetNetworkInfoForMonitor
2	#GetIpv4AddressForMonitor
3	#GetDisconnectReasonForMonitor
4	#GetSecurityParameterForMonitor
5	#GetNetworkConfigForMonitor
100	#InitializeMonitor
101	#FinalizeMonitor

GetStateForMonitor

No input, returns an output u32.

sdknso implements this by returning the u32, with 0 being returned on error.

GetNetworkInfoForMonitor

Takes a type-0x1A output buffer containing a #NetworkInfo.

GetIpv4AddressForMonitor

No input, returns an output #Ipv4Address and a #SubnetMask.

GetDisconnectReasonForMonitor

No input, returns an output s16.

This is not exposed by sdknso.

This just returns 0.

GetSecurityParameterForMonitor

No input, returns an output #SecurityParameter.

This is not exposed by sdknso.

GetNetworkConfigForMonitor

No input, returns an output #NetworkConfig.

This is not exposed by sdknso.

InitializeMonitor

No input/output.

This is used immediately after object creation. Official sw will Abort if this fails.

This just returns 0.

FinalizeMonitor

No input/output.

This is used during service exit, prior to closing the object. Official sw will Abort if this fails.

This just returns 0.

ldn:s

This is "nn::ldn::detail::ISystemServiceCreator".

Cmd	Name
0	#CreateSystemLocalCommunicationService

CreateSystemLocalCommunicationService

Returns an #ISystemLocalCommunicationService.

The user-process closes the ISystemServiceCreator object immediately after using this cmd. Official sw ignores errors from this cmd.

ISystemLocalCommunicationService

This is "nn::ldn::detail::ISystemLocalCommunicationService".

Cmd	Name
0	#GetState
1	#GetNetworkInfo
2	#GetIpv4Address
3	#GetDisconnectReason
4	#GetSecurityParameter
5	#GetNetworkConfig
100	#AttachStateChangeEvent
101	#GetNetworkInfoLatestUpdate
102	#Scan
103	#ScanPrivate
104	[5.0.0+] #SetWirelessControllerRestriction
200	#OpenAccessPoint
201	#CloseAccessPoint
202	#CreateNetwork
203	#CreateNetworkPrivate
204	#DestroyNetwork
205	#Reject
206	#SetAdvertiseData
207	#SetStationAcceptPolicy
208	#AddAcceptFilterEntry
209	#ClearAcceptFilter
300	#OpenStation
301	#CloseStation
302	#Connect
303	#ConnectPrivate
304	#Disconnect
400	#InitializeSystem
401	#FinalizeSystem
402	[4.0.0+] #SetOperationMode
403	[7.0.0+] #InitializeSystem2

GetState

No input, returns an output u32.

sdknso implements this by returning the u32, with 0 being returned on error / when service isn't initialized.

Value	Description
0	None
1	Initialized
2	AccessPointOpened
3	AccessPointCreated
4	StationOpened
5	StationConnected
6	Error

GetNetworkInfo

Takes a type-0x1A output buffer containing a #NetworkInfo.

GetIpv4Address

No input, returns an output #Ipv4Address and a #SubnetMask.

GetDisconnectReason

No input, returns an output s16.

sdknso implements this by returning the s16 as a s32, with -1 being returned on error.

Value	Description
-1	See above.
0	None
1	User
2	SystemRequest
3	DestroyedByAdmin
4	DestroyedBySystemRequest
5	Admin
6	SignalLost

GetSecurityParameter

No input, returns an output #SecurityParameter.

GetNetworkConfig

No input, returns an output #NetworkConfig.

AttachStateChangeEvent

No input, returns an output Event handle.

sdknso uses EventClearMode=1 with this. sdknso will Abort if this cmd fails.

This is signaled when the data returned by #GetNetworkInfo/#GetNetworkInfoLatestUpdate is updated.

GetNetworkInfoLatestUpdate

Takes a type-0x1A output buffer containing a #NetworkInfo and a type-0xA output buffer containing an array of #NodeLatestUpdate.

The array count must be 8.

Scan

Takes a type-0x22 output buffer containing an array of #NetworkInfo, a s16 channel, a #ScanFilter, returns an output s16 total_out.

sdknso copies the output s16 to a s32, the value passed for the input s16 is from an user-specified s32 (user-apps generally use value 0 for this).

This is the same as #ScanPrivate, except this also has the same channel-override functionality as #CreateNetwork.

State must be 3-5.

The array count must be at least 1. This is clamped to a maximum of 0x18.

ScanPrivate

Takes a type-0x22 output buffer containing an array of #NetworkInfo, a s16 channel, a #ScanFilter, returns an output s16 total_out.

sdknso copies the output s16 to a s32, the value passed for the input s16 is from an user-specified s32.

See #Scan.

SetWirelessControllerRestriction

Takes an input #WirelessControllerRestriction, no output.

State must be 1.

OpenAccessPoint

No input/output.

State must be 1, this cmd eventually sets the State to value 2.

CloseAccessPoint

No input/output.

State must be 2-3, this cmd eventually sets the State to value 1.

CreateNetwork

Takes an input #SecurityConfig, an #UserConfig, a #NetworkConfig, no output.

This is the same as #CreateNetworkPrivate, except the #AddressEntry params are 0, and the #SecurityParameter is generated from "nn::util::TinyMt::GenerateRandomBytes".

Unlike CreateNetworkPrivate, this overwrites the channel field in the #NetworkConfig. When the cached IsDevelopment value is true, the output from GetLdnChannel will overwrite that field if the s32 setting value is >=0, otherwise the original value is used. Otherwise when the IsDevelopment field is false (retail), the channel is overwritten with value 0.

This overwrites the u16 field at #SecurityConfig+0. When the cached IsDevelopment value is false (retail), value 1 is used, otherwise the original value is used.

State must be 2, this cmd eventually sets the State to value 3.

CreateNetworkPrivate

Takes an input #SecurityConfig, a #SecurityParameter, an #UserConfig, a #NetworkConfig, a type-0x9 input buffer containing an array of #AddressEntry, no output.

The buffer/count for #AddressEntry can be 0, in which case the network will be non-Private like #CreateNetwork. The count must be <=8.

See #CreateNetwork.

DestroyNetwork

No input/output.

State must be 3, this cmd eventually sets the State to value 2.

Reject

Takes an input #Ipv4Address, no output.

State must be 3.

SetAdvertiseData

Takes a type-0x21 input buffer, no output.

The input buffer contains arbitrary user data.

The buffer size must be <=0x180. An empty buffer (addr=NULL/size=0) can be used to reset the AdvertiseData size in state to zero.

State must be 2-3.

SetStationAcceptPolicy

Takes an input #AcceptPolicy, no output.

State must be 2-3.

AddAcceptFilterEntry

Takes an input #MacAddress, no output.

There are two sdknso funcs implementing this: one which takes a #MacAddress directly, the other loads the #MacAddress from the input #NodeInfo.

State must be 2-3.

ClearAcceptFilter

No input/output.

State must be 2-3.

OpenStation

No input/output.

State must be 1, this cmd eventually sets the State to value 4.

CloseStation

No input/output.

State must be 4-5, this cmd eventually sets the State to value 1.

Connect

Takes a type-0x19 input buffer containing a #NetworkInfo, a #SecurityConfig, an #UserConfig, a s32 LocalCommunicationVersion, a #ConnectOption, no output.

State must be 4, this cmd eventually sets the State to value 5.

This is identical to #ConnectPrivate (besides the below), except the data internally passed for #SecurityParameter/#NetworkConfig are loaded from the input #NetworkInfo.

This overwrites the u16 field at #SecurityConfig+0. When the cached IsDevelopment value is false (retail), value 1 is used, otherwise the used value is: original_field == 0 ? {u16 #NetworkInfo+0x60} : original_field.

u32 LocalCommunicationVersion>>15 must be 0.

ConnectPrivate

Takes a #SecurityConfig, #SecurityParameter, an #UserConfig, a s32 LocalCommunicationVersion, a #ConnectOption, a #NetworkConfig, no output.

See #Connect.

This overwrites the u16 field at #SecurityConfig+0. When the cached IsDevelopment value is false (retail), value 1 is used, otherwise the original value is used.

Disconnect

No input/output.

State must be 5, this cmd eventually sets the State to value 4.

InitializeSystem

Takes an input PID and an u64 pid_placeholder.

This is used immediately after object creation.

With [7.0.0+] #InitializeSystem2 is used instead.

FinalizeSystem

No input/output.

This is used during service exit, prior to closing the object. Official sw will Abort if this fails.

If State is set for it, this will run the equivalent of #CloseAccessPoint/#CloseStation when needed.

State must be non-zero, this cmd eventually sets the State to value 0.

SetOperationMode

Takes an input #OperationMode, no output.

State must be 1.

InitializeSystem2

Takes an input PID, an u32, and an u64 pid_placeholder.

Official sw uses hard-coded value 0x1 for the u32.

The input u32 is ignored, the impl for this cmd is identical to #InitializeSystem.

State must be 0, this cmd eventually sets the State to value 1.

ldn:u

This is "nn::ldn::detail::IUserServiceCreator".

Cmd	Name
0	#CreateUserLocalCommunicationService

CreateUserLocalCommunicationService

Returns an #IUserLocalCommunicationService.

The user-process closes the IUserServiceCreator object immediately after using this cmd. Official sw ignores errors from this cmd.

IUserLocalCommunicationService

This is "nn::ldn::detail::IUserLocalCommunicationService".

Cmd	Name
0	#GetState
1	#GetNetworkInfo
2	#GetIpv4Address
3	#GetDisconnectReason
4	#GetSecurityParameter
5	#GetNetworkConfig
100	#AttachStateChangeEvent
101	#GetNetworkInfoLatestUpdate
102	#Scan
103	#ScanPrivate
104	[5.0.0+] #SetWirelessControllerRestriction
200	#OpenAccessPoint
201	#CloseAccessPoint
202	#CreateNetwork
203	#CreateNetworkPrivate
204	#DestroyNetwork
205	#Reject
206	#SetAdvertiseData
207	#SetStationAcceptPolicy
208	#AddAcceptFilterEntry
209	#ClearAcceptFilter
300	#OpenStation
301	#CloseStation
302	#Connect
303	#ConnectPrivate
304	#Disconnect
400	#Initialize
401	#Finalize
402	[7.0.0+] #Initialize2

Initialize

Takes an input PID and an u64 pid_placeholder.

This is used immediately after object creation.

With [7.0.0+] #Initialize2 is used instead.

Finalize

No input/output.

This is used during service exit, prior to closing the object. Official sw will Abort if this fails.

Initialize2

Takes an input PID, an u32, and an u64 pid_placeholder.

Official sw uses hard-coded value 0x1 for the u32.

The input u32 is ignored, the impl for this cmd is identical to #Initialize.

ndd

This is "nn::ndd::IService".

This was added with [5.0.0] and removed with [6.0.0].

Cmd	Name
0	EnableAutoCommunication
1	DisableAutoCommunication
2	IsAutoCommunicationEnabled
3	EnablePowerSave
4	DisablePowerSave
5	IsPowerSaveEnabled
6	IsNetworkActive
7	AcquireSendDataUpdateEvent
8	AddSendData
9	ClearSendData
10	GetSendData
11	AcquireReceiveDataEvent
12	GetCurrentReceiveDataCounter
13	GetOldestReceiveDataCounter
14	GetNextReceiveDataCounter
15	GetAvailableReceiveDataCount
16	GetRecentReceiveDataCounter
17	GetReceiveData
18	AddReceiveData
19	ClearReceiveData
20	ClearDataIdFilter
21	AcquireDeviceScanEvent
22	StartDeviceScan
23	CancelDeviceScan
24	GetDeviceScanResult

lp2p:app, lp2p:sys

These are "nn::lp2p::detail::INetworkServiceCreator".

These were added with [9.0.0+].

Cmd	Name
0	#CreateNetworkService
8	#CreateNetworkServiceMonitor

CreateNetworkService

Takes an input u32, an u64 pid_reserved, a PID, returns an output #INetworkService.

The input u32 must be value 0x1.

CreateNetworkServiceMonitor

Takes an input u64 pid_reserved, a PID, returns an output #INetworkServiceMonitor.

INetworkService

This is "nn::lp2p::detail::INetworkService".

Cmd	Name
0	Initialize
[9.0.0-9.0.1] 256	AttachNetworkInterfaceStateChangeEvent
[9.0.0-9.0.1] 264	GetNetworkInterfaceLastError
[9.0.0-9.0.1] 272	GetRole
[9.0.0-9.0.1] 280
[9.0.0-9.0.1] 288	GetGroupInfo
[9.0.0-9.0.1] 296
[9.0.0-9.0.1] 304
[9.0.0-9.0.1] 312
[9.0.0-9.0.1] 320
512
768
776
784
1536	#SendToOtherGroup
1544	#RecvFromOtherGroup
1552	#AddAcceptableGroupId
1560	[9.1.0+]

Initialize

No input/output.

Returns 0.

Cmd512

Takes a type-0x19 input buffer containing a 0x200-byte struct, a type-0x22 output buffer containing an array of a 0x300-byte struct, returns an output u32.

Cmd768

Takes a type-0x31 input buffer containing a 0x200-byte struct, no output.

Cmd776

No input/output.

Cmd784

Takes a type-0x21 input buffer, no output.

The buffer size must be <=0x80.

SendToOtherGroup

Takes an input #MacAddress, a #MacAddress, a s16, a s16, an u32 flags, a type-0x21 input buffer, no output.

The buffer size must be <=0x400.

The s16s must be >=1.

Flags is only used for selecting which func to call internally, via bit0.

RecvFromOtherGroup

Takes an input u32 flags, a type-0x22 output buffer, returns a #MacAddress, an u16, a s16, an u32 out_size, a s32.

The out_size is the original size used for copying to the output buffer, before it's clamped to the output-buffer size.

Flags is only used for selecting which func to call internally, via bit0.

AddAcceptableGroupId

Takes an input #MacAddress, no output.

Cmd1560

No input/output.

INetworkServiceMonitor

This is "nn::lp2p::detail::INetworkServiceMonitor".

This interface has no commands, until [9.1.0+] which added actual commands.

Cmd	Name
0	Initialize
256	AttachNetworkInterfaceStateChangeEvent
264	GetNetworkInterfaceLastError
272	GetRole
280
281
288	GetGroupInfo
296
304
312
320
328	AttachJoinEvent
336

Initialize

Returns 0.

lp2p:m

This is "nn::lp2p::detail::IMonitorServiceCreator".

This was added with [9.1.0+].

Cmd	Name
0	#CreateMonitorService

CreateMonitorService

Takes a PID, a total of 0x10-bytes of input, and returns an #IMonitorService.

IMonitorService

This is "nn::lp2p::detail::IMonitorService".

Cmd	Name
0	Initialize
288	GetGroupInfo
320

Initialize

Returns 0.

Ipv4Address

This is "nn::ldn::Ipv4Address". This is a 0x4-byte struct with 4-byte alignment.

This is essentially the same as struct in_addr, except this is little-endian.

SubnetMask

This is "nn::ldn::SubnetMask". This is a 0x4-byte struct with 4-byte alignment.

This is essentially the same as struct in_addr, except this is little-endian.

Ssid

This is "nn::ldn::Ssid".

When converting a Ssid to a string, the loaded chars from the string must be in the range of 0x20-0x7F, otherwise the byte written to the string will be 0.

Offset	Size	Description
0x0	0x1	Length excluding NUL-terminator, must be 0x1-0x20.
0x1	0x21	SSID string including NUL-terminator, str[{above length}] must be 0.

NetworkInfo

This is "nn::ldn::NetworkInfo". This is a 0x480-byte struct. The data at +0x50 is another struct.

The fields listed as Reserved (besides the fields before +0x10) are cleared during the memset and are not written to again afterwards, with cmds which return NetworkInfo.

Offset	Size	Description
0x0	0x8	LocalCommunicationId
0x8	0x2	Reserved
0xA	0x2	Arbitrary user data which can be used for filtering with #ScanFilter.
0xC	0x4	Reserved
0x10	0x10	Last 0x10-bytes of #SecurityParameter. NetworkId which is used to generate/overwrite the #Ssid. With #Scan/#ScanPrivate, this is only done after filtering when +0x4B is value 0x2. The converted Ssid is a 0x20-byte lowercase hex string version of the input NetworkId.
0x20	0x6	#MacAddress
0x26	0x22	#Ssid
0x48	0x2	s16 NetworkChannel
0x4A	0x1	s8 LinkLevel
0x4B	0x1	Set to hard-coded value 0x2 with output structs, except with #Scan/#ScanPrivate which can also set value 0x1 in certain cases.
0x4C	0x4	Padding
0x50	0x10	First 0x10-bytes of #SecurityParameter.
0x60	0x2	Same as #SecurityConfig+0x0.
0x62	0x1	#AcceptPolicy
0x63	0x1	Only set with #Scan/#ScanPrivate, when +0x4B is value 0x2.
0x64	0x2	Padding
0x66	0x1	Maximum participants, for the #NodeInfo array.
0x67	0x1	ParticipantNum, number of set entries in the #NodeInfo array. If +0x4B is not 0x2, ParticipantNum should be handled as if it's 0.
0x68	0x200(0x40*8)	Array of #NodeInfo with 8 entries, starting with the AccessPoint node.
0x268	0x2	Reserved
0x26A	0x2	AdvertiseData size
0x26C	0x180	AdvertiseData
0x3EC	0x8C	Reserved
0x478	0x8

ScanFilter

This is "nn::ldn::ScanFilter". This is a 0x60-byte struct with 8-byte alignment.

sdknso copies the input ScanFilter to a tmp struct on stack, which is then used with the cmd.

Offset	Size	Description
0x0	0x8	When enabled, this will be overwritten if it's -1. The data written for this is the first LocalCommunicationId for the user-process loaded via arp:r, if loading fails value 0 is written instead. During filtering if enabled, u8 #NetworkInfo+0x4B must match 0x2, and this ScanFilter field must match #NetworkInfo+0x0.
0x8	0x2	Padding
0xA	0x2	During filtering if enabled, u8 #NetworkInfo+0x4B must match 0x2, and this ScanFilter field must match #NetworkInfo+0xA.
0xC	0x4	Padding
0x10	0x10	During filtering if enabled, u8 #NetworkInfo+0x4B must match 0x2, and this ScanFilter data must match #NetworkInfo+0x10.
0x20	0x4	When enabled, must be <=0x3, and during filtering must match u8 #NetworkInfo+0x4B.
0x24	0x6	#MacAddress. Only copied with #ScanPrivate. During filtering if enabled, this must match #NetworkInfo+0x20.
0x2A	0x22	#Ssid. During filtering if enabled, this must match #NetworkInfo+0x26 (the #Ssid there must be valid for this as well). The strings are compared, without verifying the length field in #Ssid matches.
0x4C	0x10	Cleared to zero for the tmp struct.
0x5C	0x4	Flags. Masked with 0x37 for #Scan, with #ScanPrivate this is masked with 0x3F.

Flags:

Bit	Description
0	When set, enables using ScanFilter+0.
1	When set, enables using ScanFilter+0x10.
2	When set, enables using ScanFilter+0x20.
3	When set, enables using the ScanFilter #MacAddress.
4	When set, enables using the ScanFilter #Ssid.
5	When set, enables using ScanFilter+0xA.

NetworkConfig

This is "nn::ldn::NetworkConfig". This is a 0x20-byte struct with 8-byte alignment.

sdknso copies the input NetworkConfig to a tmp struct on stack, which is then used with the cmd (#CreateNetwork, #CreateNetworkPrivate, #ConnectPrivate).

Offset	Size	Description
0x0	0x8	LocalCommunicationId. Same as #NetworkInfo+0x0. #CreateNetwork/#CreateNetworkPrivate/#Connect/#ConnectPrivate: When -1, this is overwritten with the first LocalCommunicationId for the user-process loaded via arp:r, if loading fails value 0 is written instead. Otherwise when not -1, if control.nacp loading is successful with arp:r, this field must match one of the LocalCommunicationIds from there otherwise an error is thrown.
0x8	0x2	Cleared to zero during the copy.
0xA	0x2	Same as #NetworkInfo+0xA.
0xC	0x4	Cleared to zero during the copy.
0x10	0x2	s16 Channel, can be zero. Same as #NetworkInfo+0x48.
0x12	0x1	s8. Same as #NetworkInfo+0x66. #CreateNetwork/#CreateNetworkPrivate: Must be 0x1-0x8.
0x13	0x1	Cleared to zero during the copy.
0x14	0x2	Same as #NetworkInfo+0x96 (LocalCommunicationVersion from the first #NodeInfo). Must not be negative. #Connect/#ConnectPrivate: This must match the value for the AccessPoint LocalCommunicationVersion.
0x16	0xA	Cleared to zero during the copy.

NodeLatestUpdate

This is "nn::ldn::NodeLatestUpdate". This is a 0x8-byte struct.

Offset	Size	Description
0x0	0x1	The field in state is reset to zero by #GetNetworkInfoLatestUpdate after loading it. Official apps checks whether this is non-zero.
0x1	0x7	Not initialized with #GetNetworkInfoLatestUpdate.

WirelessControllerRestriction

This is "nn::ldn::WirelessControllerRestriction". This is an u32 enum.

Value	Description
0
1

SecurityConfig

This is "nn::ldn::SecurityConfig". This is a 0x44-byte struct with 2-byte alignment.

Offset	Size	Description
0x0	0x2	Type, a default of value 1 can be used here. Overwritten by #CreateNetwork/#CreateNetworkPrivate and #Connect/#ConnectPrivate. The value used internally by these cmds must be 1-3.
0x2	0x2	Data size. Must be 0x10-0x40.
0x4	0x40	Data, used with key derivation.

Type:

• 1-2: Action frame data is encrypted and is verified with SHA256.
• 3: Action frame data is plaintext and is verified with SHA256.
• 2-3: Output keydata size during key-generation is set to 0 (separate from the Action frame handling). Hence, the frames for normal data-transfer are probably plaintext with this?

SecurityParameter

This is "nn::ldn::SecurityParameter". This is a 0x20-byte struct with 1-byte alignment.

Offset	Size	Description
0x0	0x10	Data, used with the same key derivation as #SecurityConfig.
0x10	0x10	NetworkId, see #NetworkInfo.

UserConfig

This is "nn::ldn::UserConfig". This is a 0x30-byte struct with 1-byte alignment.

sdknso copies the input UserConfig to a tmp struct on stack, which is then used with the cmd.

Offset	Size	Description
0x0	0x20	NUL-terminated string for the user nickname.
0x20	0x10	Cleared to zero during the copy.

AddressEntry

This is "nn::ldn::AddressEntry". This is a 0xC-byte struct.

Offset	Size	Description
0x0	0x4	#Ipv4Address
0x4	0x6	#MacAddress
0xA	0x2	Padding

AcceptPolicy

This is "nn::ldn::AcceptPolicy". This is an u8.

Value	Description
0	Allow all.
1	Deny all.
2	Blacklist, addresses in the list are not allowed.
3	Whitelist, only addresses in the list are allowed.

MacAddress

This is "nn::ldn::MacAddress". This is a 6-byte struct with 1-byte alignment.

NodeInfo

This is "nn::ldn::NodeInfo".

The fields listed as Reserved are cleared during the memset and are not written to again afterwards, with cmds which return #NetworkInfo.

Offset	Size	Description
0x0	0x4	#Ipv4Address
0x4	0x6	#MacAddress
0xA	0x1	s8 ID / index
0xB	0x1	IsConnected
0xC	0x20	First 0x20-bytes of #UserConfig.
0x2C	0x2	Reserved
0x2E	0x2	s16 LocalCommunicationVersion
0x30	0x10	Reserved

ConnectOption

This is "nn::ldn::ConnectOption". This is an u32 bitmask.

There's two versions of the sdknso funcs for #Connect/#ConnectPrivate: the version where the ConnectOption isn't user-specified uses a default value of 0x1 for it, with the same ShowError code without the bit0 check.

When bit0 here is set after using the above cmds, the sdknso funcs will use ShowError with the returned Result if: (rc & 0x3FE1FF) == 0xE0CB.

This must be <=0x1, besides this validation ConnectOption is ignored by #Connect/#ConnectPrivate.

OperationMode

This is "nn::ldn::OperationMode". This is an u32 enum.

Value	Description
0
1