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[routing-manager] deprecate OMR/on-mesh prefixes when removed from netdata (#9599)

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This commit adds `RioAdvertiser` component to `RoutingManager`, which
manages the list of prefixes advertised as RIO in emitted RA messages
by BR. The RIO prefixes are discovered from on-mesh prefixes in
Thread Network Data, including OMR prefixes from `OmrPrefixManager`
and other prefixes. Existing code for maintaining the list, appending
RIOs, and determining/setting the RIO preference is moved to the
`RioAdvertiser` class.

The `RioAdvertiser` adds a new mechanism to deprecate prefixes removed
from Network Data such that any removed prefix is still advertised as
RIO in emitted RA messages up to a deprecation interval of 300
seconds (using a shorter route lifetime in RIO). This mechanism
ensures that when an OMR prefix is withdrawn, traffic can still be
routed during deprecation time from AIL to Thread devices using the
old OMR address.

This commit also updates `test_routing_manager` to validate the new
behavior.
This commit is contained in:
Abtin Keshavarzian
2023-12-11 15:28:15 -08:00
committed by GitHub
parent c08316fad6
commit 879fdfa12b
3 changed files with 334 additions and 216 deletions
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tests/unit/test_routing_manager.cpp
+33 -3
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@@ -58,6 +58,9 @@ static const char kInfraIfAddress[] = "fe80::1";
static constexpr uint32_t kValidLitime = 2000;
static constexpr uint32_t kPreferredLifetime = 1800;
static constexpr uint32_t kRioValidLifetime = 1800;
static constexpr uint32_t kRioDeprecatingLifetime = 300;
static constexpr uint16_t kMaxRaSize = 800;
static constexpr uint16_t kMaxDeprecatingPrefixes = 16;
@@ -1382,6 +1385,8 @@ void TestOmrSelection(void)
VerifyOrQuit(sRsEmitted);
VerifyOrQuit(sRaValidated);
VerifyOrQuit(sExpectedRios.SawAll());
VerifyOrQuit(sExpectedRios[0].mLifetime == kRioValidLifetime);
Log("Received RA was validated");
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -1409,17 +1414,20 @@ void TestOmrSelection(void)
AdvanceTime(100);
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Make sure BR emits RA with new OMR prefix now.
// Make sure BR emits RA with the new OMR prefix now, and deprecates the old OMR prefix.
sRaValidated = false;
sExpectedPio = kPioAdvertisingLocalOnLink;
sExpectedRios.Clear();
sExpectedRios.Add(omrPrefix);
sExpectedRios.Add(localOmr);
AdvanceTime(20000);
VerifyOrQuit(sRaValidated);
VerifyOrQuit(sExpectedRios.SawAll());
VerifyOrQuit(sExpectedRios[0].mLifetime == kRioValidLifetime);
VerifyOrQuit(sExpectedRios[1].mLifetime <= kRioDeprecatingLifetime);
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Check Network Data. We should now see that the local OMR prefix
@@ -1437,16 +1445,20 @@ void TestOmrSelection(void)
AdvanceTime(100);
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Make sure BR emits RA with local OMR prefix again.
// Make sure BR emits RA with local OMR prefix again and start
// deprecating the previously added OMR prefix.
sRaValidated = false;
sExpectedRios.Clear();
sExpectedRios.Add(omrPrefix);
sExpectedRios.Add(localOmr);
AdvanceTime(20000);
VerifyOrQuit(sRaValidated);
VerifyOrQuit(sExpectedRios.SawAll());
VerifyOrQuit(sExpectedRios[0].mLifetime <= kRioDeprecatingLifetime);
VerifyOrQuit(sExpectedRios[1].mLifetime == kRioValidLifetime);
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Check Network Data. We should see that the local OMR prefix is
@@ -1455,6 +1467,21 @@ void TestOmrSelection(void)
VerifyOmrPrefixInNetData(localOmr, /* aDefaultRoute */ false);
VerifyExternalRouteInNetData(kUlaRoute, kWithAdvPioFlagSet);
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Wait enough for old deprecating OMR prefix deprecating to expire.
sRaValidated = false;
sExpectedRios.Clear();
sExpectedRios.Add(omrPrefix);
sExpectedRios.Add(localOmr);
AdvanceTime(310000);
VerifyOrQuit(sRaValidated);
VerifyOrQuit(sExpectedRios.SawAll());
VerifyOrQuit(sExpectedRios[0].mLifetime == 0);
VerifyOrQuit(sExpectedRios[1].mLifetime == kRioValidLifetime);
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
SuccessOrQuit(sInstance->Get<BorderRouter::RoutingManager>().SetEnabled(false));
@@ -2023,7 +2050,10 @@ void TestDomainPrefixAsOmr(void)
VerifyOrQuit(sExpectedRios[1].mPrefix == localOmr);
VerifyOrQuit(sExpectedRios[1].mSawInRa);
VerifyOrQuit(sExpectedRios[1].mLifetime == 0);
VerifyOrQuit(sExpectedRios[1].mLifetime <= kRioDeprecatingLifetime);
// Wait long enough for deprecating RIO prefix to expire
AdvanceTime(3200000);
sRaValidated = false;
sExpectedPio = kPioAdvertisingLocalOnLink;