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[routing-manager] add LocalOnLinkPrefix class (#7989)

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This commit simplifies `RoutingManager` by adding a nested class
`LocalOnLinkPrefix` which encapsulates the local on-link prefix
related info and functionality. It tracks the state of the prefix,
i.e. whether we are advertising, deprecating or not including it. It
provides a method to append it as a PIO in an RA message and uses a
timer to keep track of the prefix's lifetime (since the last time it
was advertised in an RA message).

This commit also updated the `test_routing_manager` unit test to add
`TestLocalOnLinkPrefixDeprecation()` checking the deprecation and
expiration of local on-link prefix.
This commit is contained in:
Abtin Keshavarzian
2022-08-08 09:24:10 -07:00
committed by GitHub
parent 62fcf85106
commit c28496dbd8
3 changed files with 357 additions and 120 deletions
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tests/unit/test_routing_manager.cpp
+138
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@@ -81,6 +81,7 @@ bool sRsEmitted; // Indicates if an RS message was emitted by BR.
bool sRaValidated; // Indicates if an RA was emitted by BR and successfully validated.
bool sSawExpectedRio; // Indicates if the emitted RA by BR contained an RIO with `sExpectedRioPrefix`
ExpectedPio sExpectedPio; // Expected PIO in the emitted RA by BR (MUST be seen in RA to set `sRaValidated`).
uint32_t sOnLinkLifetime; // Valid lifetime for local on-link prefix from the last processed RA.
Ip6::Prefix sExpectedRioPrefix; // Expected RIO prefix to see in RA (MUST be seen to set `sSawExpectedRio`).
//----------------------------------------------------------------------------------------------------------------------
@@ -245,6 +246,8 @@ void ValidateRouterAdvert(const Icmp6Packet &aPacket)
VerifyOrQuit(pio.GetPreferredLifetime() == 0, "On link prefix is not deprecated");
}
sOnLinkLifetime = pio.GetValidLifetime();
break;
}
@@ -1105,6 +1108,140 @@ void TestDefaultRoute(void)
testFreeInstance(sInstance);
}
void TestLocalOnLinkPrefixDeprecation(void)
{
static constexpr uint32_t kMaxRaTxInterval = 601; // In seconds
Ip6::Prefix localOnLink;
Ip6::Prefix localOmr;
Ip6::Prefix onLinkPrefix = PrefixFromString("2000:abba:baba::", 64);
Ip6::Address routerAddressA = AddressFromString("fd00::aaaa");
uint32_t localOnLinkLifetime;
Log("--------------------------------------------------------------------------------------------");
Log("TestLocalOnLinkPrefixDeprecation");
InitTest();
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Start Routing Manager. Check emitted RS and RA messages.
SuccessOrQuit(sInstance->Get<BorderRouter::RoutingManager>().SetEnabled(true));
SuccessOrQuit(sInstance->Get<BorderRouter::RoutingManager>().GetOnLinkPrefix(localOnLink));
SuccessOrQuit(sInstance->Get<BorderRouter::RoutingManager>().GetOmrPrefix(localOmr));
Log("Local on-link prefix is %s", localOnLink.ToString().AsCString());
Log("Local OMR prefix is %s", localOmr.ToString().AsCString());
sRsEmitted = false;
sRaValidated = false;
sSawExpectedRio = false;
sExpectedPio = kPioAdvertisingLocalOnLink;
sExpectedRioPrefix = localOmr;
AdvanceTime(30000);
VerifyOrQuit(sRsEmitted);
VerifyOrQuit(sRaValidated);
VerifyOrQuit(sSawExpectedRio);
Log("Local on-link prefix is being advertised, lifetime: %d", sOnLinkLifetime);
localOnLinkLifetime = sOnLinkLifetime;
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Check Network Data to include the local OMR and on-link prefix.
VerifyOmrPrefixInNetData(localOmr);
VerifyExternalRoutesInNetData({ExternalRoute(localOnLink, NetworkData::kRoutePreferenceMedium)});
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Send an RA from router A with a new on-link (PIO) which is preferred over
// the local on-link prefix.
SendRouterAdvert(routerAddressA, {Pio(onLinkPrefix, kValidLitime, kPreferredLifetime)});
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Check that the local on-link prefix is now deprecating in the new RA.
sRaValidated = false;
sSawExpectedRio = false;
sExpectedPio = kPioDeprecatingLocalOnLink;
AdvanceTime(10000);
VerifyOrQuit(sRaValidated);
VerifyOrQuit(sSawExpectedRio);
Log("On-link prefix is deprecating, remaining lifetime:%d", sOnLinkLifetime);
VerifyOrQuit(sOnLinkLifetime < localOnLinkLifetime);
localOnLinkLifetime = sOnLinkLifetime;
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Check Network Data. We must see the new on-link prefix from router A
// along with the deprecating local on-link prefix.
VerifyOmrPrefixInNetData(localOmr);
VerifyExternalRoutesInNetData({ExternalRoute(localOnLink, NetworkData::kRoutePreferenceMedium),
ExternalRoute(onLinkPrefix, NetworkData::kRoutePreferenceMedium)});
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Wait for local on-link prefix to expire
while (localOnLinkLifetime > kMaxRaTxInterval)
{
// Send same RA from router A to keep the on-link prefix alive.
SendRouterAdvert(routerAddressA, {Pio(onLinkPrefix, kValidLitime, kPreferredLifetime)});
// Ensure Network Data entries remain as before. Mainly we still
// see the deprecating local on-link prefix.
VerifyOmrPrefixInNetData(localOmr);
VerifyExternalRoutesInNetData({ExternalRoute(localOnLink, NetworkData::kRoutePreferenceMedium),
ExternalRoute(onLinkPrefix, NetworkData::kRoutePreferenceMedium)});
// Keep checking the emitted RAs and make sure on-link prefix
// is included with smaller lifetime every time.
sRaValidated = false;
sSawExpectedRio = false;
sExpectedPio = kPioDeprecatingLocalOnLink;
AdvanceTime(kMaxRaTxInterval * 1000);
VerifyOrQuit(sRaValidated);
VerifyOrQuit(sSawExpectedRio);
Log("On-link prefix is deprecating, remaining lifetime:%d", sOnLinkLifetime);
VerifyOrQuit(sOnLinkLifetime < localOnLinkLifetime);
localOnLinkLifetime = sOnLinkLifetime;
}
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// The local on-link prefix must be expired and should no
// longer be seen in the emitted RA message.
sRaValidated = false;
sSawExpectedRio = false;
sExpectedPio = kNoPio;
AdvanceTime(kMaxRaTxInterval * 1000);
VerifyOrQuit(sRaValidated);
VerifyOrQuit(sSawExpectedRio);
Log("On-link prefix is now expired");
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Check Network Data and make sure the the expired local on-link prefix
// is removed.
VerifyOmrPrefixInNetData(localOmr);
VerifyExternalRoutesInNetData({ExternalRoute(onLinkPrefix, NetworkData::kRoutePreferenceMedium)});
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Log("End of TestLocalOnLinkPrefixDeprecation");
testFreeInstance(sInstance);
}
#endif // OPENTHREAD_CONFIG_BORDER_ROUTING_ENABLE
int main(void)
@@ -1113,6 +1250,7 @@ int main(void)
TestSamePrefixesFromMultipleRouters();
TestOmrSelection();
TestDefaultRoute();
TestLocalOnLinkPrefixDeprecation();
printf("All tests passed\n");
#else
printf("BORDER_ROUTING feature is not enabled\n");