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[mdns] alternate platform API for signaling local address changes (#11394)

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This commit introduces an alternate mechanism for the platform layer
to signal local host address changes to the OpenThread mDNS module.

The existing approach, where the platform invokes
`otPlatMdnsHandleHostAddressEvent()` for each added or removed
address, remains supported.

The new approach allows the platform to call the newly added
`otPlatMdnsHandleHostAddressRemoveAll()` callback once, immediately
followed by invoking `otPlatMdnsHandleHostAddressEvent` for every
currently assigned IPv4 and IPv6 address on the interface.

These two approaches offer flexibility for platforms with varying
capabilities accommodating different operating systems and network
stacks. Some network stacks may provide mechanisms to identify the
added or removed addresses, while others may only provide the new
list upon a change.

The `test_mdns` unit test is updated to validate this newly added
mechanism.
This commit is contained in:
Abtin Keshavarzian
2025-04-16 08:17:45 -06:00
committed by GitHub
parent d9d5b2e2c6
commit 247b353e16
5 changed files with 175 additions and 6 deletions
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tests/unit/test_mdns.cpp
+116 -1
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@@ -2321,7 +2321,7 @@ void TestLocalHost(void)
localHost.mIp6Addrs.Remove(ip6Address);
otPlatMdnsHandleHostAddressEvent(sInstance, &ip6Address, /* aAdded */ false, kInfraIfIndex);
// Add and then remove the same address quickly
// Add then remove the same address quickly
// It should not be included in the announcements.
SuccessOrQuit(ip6Address.FromString("fd00:cafe::333"));
@@ -2387,6 +2387,121 @@ void TestLocalHost(void)
sDnsMessages.Clear();
}
Log("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -");
Log("Signal removal of all host addresses and add them all back");
otPlatMdnsHandleHostAddressRemoveAll(sInstance, kInfraIfIndex);
for (Ip6::Address &ip6Addr : localHost.mIp6Addrs)
{
otPlatMdnsHandleHostAddressEvent(sInstance, &ip6Addr, /* aAdded */ true, kInfraIfIndex);
}
for (Ip4::Address &ip4Addr : localHost.mIp4Addrs)
{
ip6Address.SetToIp4Mapped(ip4Addr);
otPlatMdnsHandleHostAddressEvent(sInstance, &ip6Address, /* aAdded */ true, kInfraIfIndex);
}
Log("Validate that there are no announcements");
sDnsMessages.Clear();
AdvanceTime(10 * 1000);
VerifyOrQuit(sDnsMessages.IsEmpty());
Log("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -");
Log("Signal removal of all addr, add them all back with one extra IPv6 and one extra IPv4 addr");
otPlatMdnsHandleHostAddressRemoveAll(sInstance, kInfraIfIndex);
SuccessOrQuit(ip6Address.FromString("fd00:cafe::5555"));
SuccessOrQuit(localHost.mIp6Addrs.PushBack(ip6Address));
for (Ip6::Address &ip6Addr : localHost.mIp6Addrs)
{
otPlatMdnsHandleHostAddressEvent(sInstance, &ip6Addr, /* aAdded */ true, kInfraIfIndex);
}
SuccessOrQuit(ip4Address.FromString("200.0.64.13"));
SuccessOrQuit(localHost.mIp4Addrs.PushBack(ip4Address));
for (Ip4::Address &ip4Addr : localHost.mIp4Addrs)
{
ip6Address.SetToIp4Mapped(ip4Addr);
otPlatMdnsHandleHostAddressEvent(sInstance, &ip6Address, /* aAdded */ true, kInfraIfIndex);
}
Log("Validate the announcements");
sDnsMessages.Clear();
AdvanceTime(5);
for (uint8_t anncCount = 0; anncCount < kNumAnnounces; anncCount++)
{
AdvanceTime((anncCount == 0) ? 0 : (1U << (anncCount - 1)) * 1000);
VerifyOrQuit(!sDnsMessages.IsEmpty());
dnsMsg = sDnsMessages.GetHead();
dnsMsg->ValidateHeader(kMulticastResponse, /* Q */ 0, /* Ans */ 8, /* Auth */ 0, /* Addnl */ 1);
dnsMsg->Validate(localHost, kInAnswerSection, kCheckAaaa | kCheckA);
VerifyOrQuit(dnsMsg->GetNext() == nullptr);
sDnsMessages.Clear();
}
AdvanceTime(10 * 1000);
Log("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -");
Log("Signal removal of all addresses and add some back");
otPlatMdnsHandleHostAddressRemoveAll(sInstance, kInfraIfIndex);
for (Ip6::Address &ip6Addr : localHost.mIp6Addrs)
{
otPlatMdnsHandleHostAddressEvent(sInstance, &ip6Addr, /* aAdded */ true, kInfraIfIndex);
}
Log("Before previous events are processed, signal removal of all addresses again");
Log("And add them all back without the recently added extra IPv6 and IPv4 addresses");
AdvanceTime(1);
otPlatMdnsHandleHostAddressRemoveAll(sInstance, kInfraIfIndex);
otPlatMdnsHandleHostAddressRemoveAll(sInstance, kInfraIfIndex);
localHost.mIp6Addrs.PopBack();
localHost.mIp4Addrs.PopBack();
for (Ip6::Address &ip6Addr : localHost.mIp6Addrs)
{
otPlatMdnsHandleHostAddressEvent(sInstance, &ip6Addr, /* aAdded */ true, kInfraIfIndex);
}
for (Ip4::Address &ip4Addr : localHost.mIp4Addrs)
{
ip6Address.SetToIp4Mapped(ip4Addr);
otPlatMdnsHandleHostAddressEvent(sInstance, &ip6Address, /* aAdded */ true, kInfraIfIndex);
}
Log("Validate the announcements");
sDnsMessages.Clear();
AdvanceTime(5);
for (uint8_t anncCount = 0; anncCount < kNumAnnounces; anncCount++)
{
AdvanceTime((anncCount == 0) ? 0 : (1U << (anncCount - 1)) * 1000);
VerifyOrQuit(!sDnsMessages.IsEmpty());
dnsMsg = sDnsMessages.GetHead();
dnsMsg->ValidateHeader(kMulticastResponse, /* Q */ 0, /* Ans */ 6, /* Auth */ 0, /* Addnl */ 1);
dnsMsg->Validate(localHost, kInAnswerSection, kCheckAaaa | kCheckA);
VerifyOrQuit(dnsMsg->GetNext() == nullptr);
sDnsMessages.Clear();
}
Log("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -");
Log("Signal all host IPv4 addresses are removed, validate goodbye announcements");