Nintendo Switch Brew

LDN services: Difference between revisions

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No input. Returns an [[#ISystemLocalCommunicationService]].
No input. Returns an [[#ISystemLocalCommunicationService]].


The user-process closes the ISystemServiceCreator object immediately after using this cmd. Official sw ignores errors from this cmd.
The user-process closes the ISystemServiceCreator object once finished with it during initialization. Official sw ignores errors from this cmd.


== CreateClientProcessMonitor ==
== CreateClientProcessMonitor ==
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The sdk user-process func will pass value 1 to the cmd when the input [[#Protocol|Protocol]] is 0/1, 3 is passed directly if specified, otherwise Abort. User-processes use SetProtocol immediately after initializing ldn.
The sdk user-process func will pass value 1 to the cmd when the input [[#Protocol|Protocol]] is 0/1, 3 is passed directly if specified, otherwise Abort. User-processes use SetProtocol immediately after initializing ldn.


The ldn initialization functionality in sdknso also uses this with value 1 (NX) eventually after the init cmd was used successfully.
[20.0.0+] The ldn initialization functionality in sdknso also uses this with value 1 (NX) eventually after the init cmd was used successfully.


The input is validated, then a vfunc is called.
The input is validated, then a vfunc is called.
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This is used immediately after object creation.
This is used immediately after object creation.


With [7.0.0+] [[#InitializeWithVersion|InitializeWithVersion]] is used instead. The cmd impl for Initialize uses [[#InitializeWithVersion|InitializeWithVersion]] with input_u32=0.
On old sysvers the cmd impl for User/System are identical, except different params are used for the funcs called internally.
 
With [7.0.0+] [[#InitializeWithVersion|InitializeWithVersion]] is used instead. The cmd impl for Initialize uses [[#InitializeWithVersion|InitializeWithVersion]] with version=0.


=== Finalize ===
=== Finalize ===
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=== InitializeWithVersion ===
=== InitializeWithVersion ===
Takes an input PID, an u32, and an u64 pid_placeholder.
Takes an input PID, a s32 version, and an u64 pid_placeholder.
 
The priority is determined by whether the interface is User/System: System = 0x38, User = 0x5A.
 
It then calls the init func, with the cmd input params and the above priority, returning the Result on failure.
 
On newer sysvers this then adds an entry for the state array used by [[#RegisterClient|RegisterClient]].


Official sw uses hard-coded value 0x1 for the u32.
Lastly the input PID and version are written into state, then this returns.


The input u32 is ignored, the impl for this cmd is identical to [[#Initialize_2|Initialize]].
The init func does the following:
* The PID must be non-zero, and the version must not be negative. The priority must be 0x5A or 0x38.
* An error is returned if state fields are invalid.
* The input PID and version are written into state (a state field is also set to interface == User).
* Lastly, a vfunc is called with the input priority, returning the Result from that.


Internally this calls a func with params: (..., PID, &{u16 value 0x38}). On success, this then calls another func (which sets two state fields to the input) with params: (state, 0) (these state fields are used during [[#Authentication]] to check which service is being used).
The vfunc does the following:
* On newer sysvers, this uses [[Shared_Database_services|pl:s]] RequestApplicationFunctionAuthorizationByProcessId with the input PID and [[Shared_Database_services|ApplicationFunctionAuthorizationId]] = 2 (SecureLdnLocalCommunication), returning the Result on failure.
* Then a message is sent to a msg-queue with the input priority.


The first func uses various [[Network_Interface_services|nifm]] funcs. The input value is used to determine the value for [[Network_Interface_services#CreateRequest|nn::nifm::RequestParameters]]: essentially, value 0x4 is used for ldn:u, and value 0x8 is used for ldn:s. The input value is also copied into state.
The handler for the above message does the following:
* When state is already initialized, runs handling for that. An error is also thrown if the input priority is larger than a state field.
* Initializes state, etc.
* Various [[Network_Interface_services|nifm]] funcs are eventually used. The input priority is used to determine the value for [[Network_Interface_services#CreateRequest|nn::nifm::RequestParameters]]: value 0x4 or value 0x8 is used, depending on priority > 0x59.
** Newer versions also handle ldn lan_emulation [[System_Settings|sys-settings]] here. For the above value, when lan_emulation is enabled it uses value 0x17, with 0x18 additionally used for priority <= 0x59.
* The rest is state init, including setting [[#State|State]] to value 1. Then 0 is returned.


[[#GetState|State]] must be 0, this cmd eventually sets the State to value 1.
On old sysvers the cmd impl for User/System are identical, except different params are used for the funcs called internally. With newer sysvers the cmd impl is now identical.
 
Version values passed by official sw:
 
{| class="wikitable" border="1"
|-
! Value || SystemVersion
|-
| 0x1 || [7.0.0+]
|-
| 0x2 || [18.0.0+]
|-
| 0x3 || [19.0.0+]
|-
| 0x4 || [20.0.0+]
|}


=== InitializeWithPriority ===
=== InitializeWithPriority ===
Takes an input PID, an u32, an u32, and an u64 pid_placeholder.
Takes an input PID, a s32 version, a s32 priority, and an u64 pid_placeholder.


This is similar to [[#InitializeWithVersion|InitializeWithVersion]], with the additional cmd input u32 now being passed directly to the init func which is called here.
This is similar to [[#InitializeWithVersion|InitializeWithVersion]]. The input priority is passed directly to the init func which is called here, instead of determining it from whether the interface is User/System.
 
Official sw passes input value 0x38 for the priority as the default, when the user doesn't specify the priority.


=== EnableActionFrame ===
=== EnableActionFrame ===
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| 0 || RegisterClient
| 0 || RegisterClient
|}
|}
=== RegisterClient ===
Takes an input PID and an u64 pid_placeholder.
[18.0.0+] [[#CreateClientProcessMonitor|CreateClientProcessMonitor]] and RegisterClient are used by sdknso at the end of the ldn initialization functionality.
If the objptr in IClientProcessMonitor state is already set from using this cmd previously, this just returns 0.
This goes through global state to locate an entry with a matching PID, if none found 0 is returned. The objptr from the state entry is loaded, if NULL this returns 0. This obj is then incref'd and written into the IClientProcessMonitor state. When PID is 0, 0 is returned. It then locates the above state entry again with a matching PID, clearing the entry which matches. Lastly 0 is returned.
The initialization [[#InitializeWithPriority|cmds]] adds an entry to the above global state.


= ldn:u =
= ldn:u =
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Returns an [[#IUserLocalCommunicationService]].
Returns an [[#IUserLocalCommunicationService]].


The user-process closes the IUserServiceCreator object immediately after using this cmd. Official sw ignores errors from this cmd.
The user-process closes the IUserServiceCreator object once finished with it during initialization. Official sw ignores errors from this cmd.


== IUserLocalCommunicationService ==
== IUserLocalCommunicationService ==
This is "nn::ldn::detail::IUserLocalCommunicationService".
This is "nn::ldn::detail::IUserLocalCommunicationService".
This is identical to [[#ISystemLocalCommunicationService]], except for the System-only cmd(s), and [[#Initialize_3|Initialize]]/[[#InitializeWithVersion_2|InitializeWithVersion]] differ.


{| class="wikitable" border="1"
{| class="wikitable" border="1"
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| 304 || [[#Disconnect|Disconnect]]
| 304 || [[#Disconnect|Disconnect]]
|-
|-
| 400 || [[#Initialize_3|Initialize]]
| 400 || [[#Initialize_2|Initialize]]
|-
|-
| 401 || [[#Finalize_3|Finalize]]
| 401 || [[#Finalize_2|Finalize]]
|-
|-
| 402 || [7.0.0+] [[#InitializeWithVersion_2|InitializeWithVersion]]
| 402 || [7.0.0+] [[#InitializeWithVersion|InitializeWithVersion]]
|-
|-
| 403 || [19.0.0+] [[#InitializeWithPriority|InitializeWithPriority]]
| 403 || [19.0.0+] [[#SetOperationMode|SetOperationMode]]
|-
|-
| 500 || [18.0.0+] [[#EnableActionFrame|EnableActionFrame]]
| 500 || [18.0.0+] [[#EnableActionFrame|EnableActionFrame]]
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| 601 || [18.0.0+] [[#ResetTxPower|ResetTxPower]]
| 601 || [18.0.0+] [[#ResetTxPower|ResetTxPower]]
|}
|}
=== Initialize ===
Takes an input PID and an u64 pid_placeholder.
This is used immediately after object creation.
With [7.0.0+] [[#InitializeWithVersion_2|InitializeWithVersion]] is used instead.
This is identical to [[#Initialize_2|Initialize]] except different params are used for the funcs called internally.
=== Finalize ===
No input/output.
This is used during service exit, prior to closing the object. Official sw will Abort if this fails.
=== InitializeWithVersion ===
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_3|Initialize]].
This is identical to [[#InitializeWithVersion|InitializeWithVersion]] except different params are used for the funcs called internally: the u16 value is 0x5A, and the value for the second func is 1.


= ndd =
= ndd =
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= NodeInfo =
= NodeInfo =
This is "nn::ldn::NodeInfo".
This is "nn::ldn::NodeInfo".
The first node in the nodes array is always the AccessPoint (NodeId 0x0). NodeId is the index of the node in the nodes array.


{| class="wikitable" border="1"
{| class="wikitable" border="1"
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| 0xC || 0x4 || Reserved
| 0xC || 0x4 || Reserved
|}
|}
* LocalCommunicationId: [[#CreateNetwork|CreateNetwork]], [[#CreateNetworkPrivate|CreateNetworkPrivate]], [[#Connect|Connect]], [[#ConnectPrivate|ConnectPrivate]] (also [[#ScanFilter|ScanFilter]] when enabled with the flag): When -1, this is overwritten with the first LocalCommunicationId from the user-process [[NACP]], if loading fails value 0 is written instead. Otherwise when not -1, if [[NACP]] loading is successful, this field must match one of the LocalCommunicationIds from there.
* SceneId: Arbitrary user data, this can be used for filtering with [[#ScanFilter|ScanFilter]] for example.


= SessionId =
= SessionId =
This is "nn::ldn::SessionId".
This is "nn::ldn::SessionId".
This is used to generate/overwrite the Ssid when needed.


{| class="wikitable" border="1"
{| class="wikitable" border="1"
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This is "nn::ldn::ScanFilter". This is a 0x60-byte struct with 8-byte alignment.
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.
sdknso copies the input ScanFilter to a tmp struct on stack (with [[#ScanFilterFlag|Flag]] masking), which is then used with the cmd. sdknso only copies Bssid with [[#ScanPrivate|ScanPrivate]], with [[#Scan|Scan]] it also masks out the [[#ScanFilterFlag|Flag]] for Bssid.


{| class="wikitable" border="1"
{| class="wikitable" border="1"
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| 0x5C || 0x4 || [[#ScanFilterFlag|Flag]]
| 0x5C || 0x4 || [[#ScanFilterFlag|Flag]]
|}
|}
Each [[#ScanFilterFlag|Flag]] bit when set enables using the corresponding ScanFilter data. This is usually a compare with the ScanFilter data and the internal [[#NetworkInfo|NetworkInfo]] data.
* NetworkType: (ScanFilter_NetworkType & NetworkInfo_NetworkType) must be non-zero.
* Ssid: The length fields must match, then memcmp is used.
The filtering func also handles validating the Band/Channel, however these fields are internal only and are not exposed in the user ScanFilter.


= ScanFilterFlag =
= ScanFilterFlag =
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! Description
! Description
|-
|-
| 0x0 || 0x21 || UserName (NUL-terminated string for the user nickname)
| 0x0 || 0x21 || UserName (NUL-terminated string for the user name)
|-
|-
| 0x21 || 0xF || Reserved
| 0x21 || 0xF || Reserved
Retrieved from "https://switchbrew.org/wiki/LDN_services"