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[dns-client] use NAT64 prefix from network data (#6783)

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This commit updates `AddressResponse::GetNat64Prefix()` to search in
Network Data to find NAT64 prefixes added by BRs. Prefixes with
higher preference are selected first.
This commit is contained in:
Abtin Keshavarzian
2021-07-12 12:45:56 -07:00
committed by GitHub
parent 05fd1deb49
commit 5d54dc2c5b
1 changed files with 20 additions and 4 deletions
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src/core/net/dns_client.cpp
+20 -4
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@@ -350,13 +350,29 @@ exit:
Error Client::AddressResponse::GetNat64Prefix(Ip6::Prefix &aPrefix) const
{
// Use well-known prefix "64:ff9b::/96" (temporary solution).
static const uint8_t kWellknownPrefix[] = {0x00, 0x64, 0xff, 0x9b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
Error error = kErrorNotFound;
NetworkData::Iterator iterator = NetworkData::kIteratorInit;
signed int preference = OT_ROUTE_PREFERENCE_LOW;
NetworkData::ExternalRouteConfig config;
aPrefix.Clear();
aPrefix.Set(kWellknownPrefix, 96);
return kErrorNone;
while (mInstance->Get<NetworkData::Leader>().GetNextExternalRoute(iterator, config) == kErrorNone)
{
if (!config.mNat64 || !config.GetPrefix().IsValidNat64())
{
continue;
}
if ((aPrefix.GetLength() == 0) || (config.mPreference > preference))
{
aPrefix = config.GetPrefix();
preference = config.mPreference;
error = kErrorNone;
}
}
return error;
}
#endif // OPENTHREAD_CONFIG_DNS_CLIENT_NAT64_ENABLE