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[mle] implement alternate RLOC16 usage during role transition (#10006)

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This commit introduces a mechanism for a device transitioning from
child to router role to keep receiving frames addressed to its
previous short address for a brief period.

A new radio platform API, `otPlatRadioSetAlternateShortAddress()`, is
introduced. This allows the OT stack to configure an alternate short
address. Radio platform support for this function is indicated by the
`OT_RADIO_CAPS_ALT_SHORT_ADDR` capability in `otPlatRadioGetCaps()`
The same function can be used with `OT_RADIO_INVALID_SHORT_ADDR`
(`0xfffe`) to clear a previously set alternate short address. Support
for the new API is implemented in RCP and `RadioSpinel`, ensuring
backward compatibility by dynamically checking supported radio
capabilities.

MLE code is updated to instruct the radio to use the old child RLOC16
as an alternate address upon role transition. The MLE layer will
automatically clear the alternate address after eight seconds, or if
other state/mode changes occur. This eight-second window ensures the
new router can transmit four MLE Advertisement messages.
This commit is contained in:
Abtin Keshavarzian
2024-10-30 16:38:10 -07:00
committed by GitHub
parent a5e1c91055
commit 444d1dd6bc
35 changed files with 519 additions and 28 deletions
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examples/platforms/simulation/radio.c
+12 -3
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@@ -382,6 +382,15 @@ void otPlatRadioSetShortAddress(otInstance *aInstance, otShortAddress aShortAddr
sRadioContext.mShortAddress = aShortAddress;
}
void otPlatRadioSetAlternateShortAddress(otInstance *aInstance, otShortAddress aShortAddress)
{
OT_UNUSED_VARIABLE(aInstance);
assert(aInstance != NULL);
sRadioContext.mAlternateShortAddress = aShortAddress;
}
void otPlatRadioSetPromiscuous(otInstance *aInstance, bool aEnable)
{
OT_UNUSED_VARIABLE(aInstance);
@@ -849,9 +858,9 @@ void radioProcessFrame(otInstance *aInstance)
otEXPECT(sPromiscuous == false);
otEXPECT_ACTION(
otMacFrameDoesAddrMatch(&sReceiveFrame, sPanid, sRadioContext.mShortAddress, &sRadioContext.mExtAddress),
error = OT_ERROR_ABORT);
otEXPECT_ACTION(otMacFrameDoesAddrMatchAny(&sReceiveFrame, sPanid, sRadioContext.mShortAddress,
sRadioContext.mAlternateShortAddress, &sRadioContext.mExtAddress),
error = OT_ERROR_ABORT);
#if OPENTHREAD_CONFIG_MLE_LINK_METRICS_SUBJECT_ENABLE
otEXPECT_ACTION(otMacFrameGetSrcAddr(&sReceiveFrame, &macAddress) == OT_ERROR_NONE, error = OT_ERROR_PARSE);