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[trel] implement new TREL model using DNS-SD (#7125)

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This commit implements the new TREL model which uses DNS-SD to
discover TREL peers on the network. This implementation replaces the
previous model which relied on link-local multicast.

This commit adds a new set of `otPlatTrel` APIs and callbacks that are
then used by an updated `Trel::Interface` implementation. The
`Trel::Interface` maintains a TREL peer table which is populated from
DNS-SD discovered services. A device supporting TREL registers a new
service to be advertised using DNS-SD with the service name
`_trel._udp`. It also initiates an ongoing DNS-SD browse for the same
service name within the local browsing domain to discover other
devices supporting TREL. `Trel::Interface` encapsulates and send
unicast frames as a unicast UDP message between TREL peers. Broadcast
frames are sent as a group of UDP unicast transmission to a sub-set
of TREL peers.

This commit also adds a new set of public APIs for TREL along with
support for them in CLI:
- APIs for enabling/disabling of TREL operation at run-time.
- Filter mode API which when enabled temporarily drops all the traffic
  on the TREL interface (is mainly intended for testing).
- APIs to get the TREL peer table entries.

This commit adds an implementation of the new `otPlatTrel` APIs under
`simulation` platform. This is used for testing. This implementation
emulates a simplified version of DNS-SD mechanism.

A basic implementation  of the `otPlatTrel` is also provided under
`posix` platform. However certain functions are tied to mDNS or
DNS-SD library being used on a device and need to be implemented per
project/platform. A set of weak empty functions `trelDnssd{}` are
defined (along with a description of the their expected behavior)
which can be overridden during project/platform integration.
This commit is contained in:
Abtin Keshavarzian
2022-01-28 12:07:42 -08:00
committed by Jonathan Hui
parent 1c6062c610
commit 69ad96675f
33 changed files with 2019 additions and 1409 deletions
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tests/unit/test_platform.cpp
+4 -12
View File
@@ -446,29 +446,21 @@ OT_TOOL_WEAK void otPlatOtnsStatus(const char *)
#endif
#if OPENTHREAD_CONFIG_RADIO_LINK_TREL_ENABLE
OT_TOOL_WEAK void otPlatTrelUdp6Init(otInstance *, const otIp6Address *, uint16_t)
OT_TOOL_WEAK void otPlatTrelEnable(otInstance *, uint16_t *)
{
}
OT_TOOL_WEAK void otPlatTrelUdp6UpdateAddress(otInstance *, const otIp6Address *)
OT_TOOL_WEAK void otPlatTrelDisable(otInstance *)
{
}
OT_TOOL_WEAK void otPlatTrelUdp6SubscribeMulticastAddress(otInstance *, const otIp6Address *)
OT_TOOL_WEAK void otPlatTrelSend(otInstance *, const uint8_t *, uint16_t, const otSockAddr *)
{
}
OT_TOOL_WEAK otError otPlatTrelUdp6SendTo(otInstance *, const uint8_t *, uint16_t, const otIp6Address *)
OT_TOOL_WEAK void otPlatTrelRegisterService(otInstance *, uint16_t, const uint8_t *, uint8_t)
{
return OT_ERROR_ABORT;
}
OT_TOOL_WEAK otError otPlatTrelUdp6SetTestMode(otInstance *, bool)
{
return OT_ERROR_NOT_IMPLEMENTED;
}
#endif
#if OPENTHREAD_CONFIG_MLE_LINK_METRICS_SUBJECT_ENABLE