[posix] allow bind to Thread interface only (#4965)

src/core/thread/tmf.cpp

@@ -0,0 +1,82 @@
+/*
+ *  Copyright (c) 2020, The OpenThread Authors.
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are met:
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the copyright holder nor the
+ *     names of its contributors may be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *  POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @file
+ *   This file implements Thread Management Framework (TMF) functionalities.
+ */
+
+#include "thread/tmf.hpp"
+
+#include "common/locator-getters.hpp"
+
+namespace ot {
+namespace Tmf {
+
+otError TmfAgent::Start(void)
+{
+    otError error;
+
+    SuccessOrExit(error = Coap::Start(kUdpPort));
+#if OPENTHREAD_CONFIG_PLATFORM_UDP_ENABLE
+    error = mSocket.BindToNetif(OT_NETIF_THREAD);
+    VerifyOrExit(OT_ERROR_NONE == error, IgnoreError(mSocket.Close()));
+#endif
+
+exit:
+    return error;
+}
+
+otError TmfAgent::Filter(const ot::Coap::Message &aMessage, const Ip6::MessageInfo &aMessageInfo, void *aContext)
+{
+    OT_UNUSED_VARIABLE(aMessage);
+
+    return static_cast<TmfAgent *>(aContext)->IsTmfMessage(aMessageInfo) ? OT_ERROR_NONE : OT_ERROR_NOT_TMF;
+}
+
+bool TmfAgent::IsTmfMessage(const Ip6::MessageInfo &aMessageInfo) const
+{
+    bool rval = true;
+
+    // A TMF message must comply with following rules:
+    // 1. The destination is a Mesh Local Address or a Link-Local Multicast Address or a Realm-Local Multicast Address,
+    //    and the source is a Mesh Local Address. Or
+    // 2. Both the destination and the source are Link-Local Addresses.
+    VerifyOrExit(
+        ((Get<Mle::MleRouter>().IsMeshLocalAddress(aMessageInfo.GetSockAddr()) ||
+          aMessageInfo.GetSockAddr().IsLinkLocalMulticast() || aMessageInfo.GetSockAddr().IsRealmLocalMulticast()) &&
+         Get<Mle::MleRouter>().IsMeshLocalAddress(aMessageInfo.GetPeerAddr())) ||
+            ((aMessageInfo.GetSockAddr().IsLinkLocal() || aMessageInfo.GetSockAddr().IsLinkLocalMulticast()) &&
+             aMessageInfo.GetPeerAddr().IsLinkLocal()),
+        rval = false);
+exit:
+    return rval;
+}
+
+} // namespace Tmf
+} // namespace ot