1 /*
2 * Copyright (c) 2021, The OpenThread Authors.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Neither the name of the copyright holder nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /**
30 * @file
31 * This file implements IPv6 Neighbor Discovery Agent.
32 */
33
34 #include "nd_agent.hpp"
35
36 #if OPENTHREAD_CONFIG_NEIGHBOR_DISCOVERY_AGENT_ENABLE
37
38 #include "instance/instance.hpp"
39
40 namespace ot {
41 namespace NeighborDiscovery {
42
UpdateService(void)43 void Agent::UpdateService(void)
44 {
45 Error error;
46 uint16_t rloc16 = Get<Mle::MleRouter>().GetRloc16();
47 NetworkData::Iterator iterator;
48 NetworkData::OnMeshPrefixConfig config;
49 Lowpan::Context lowpanContext;
50
51 if (IsAlocInUse())
52 {
53 uint8_t contextId = static_cast<uint8_t>(mAloc.GetAddress().GetIid().GetLocator() -
54 Mle::kAloc16NeighborDiscoveryAgentStart + 1);
55 bool found = false;
56
57 iterator = NetworkData::kIteratorInit;
58
59 while (Get<NetworkData::Leader>().GetNextOnMeshPrefix(iterator, rloc16, config) == kErrorNone)
60 {
61 if (!config.mNdDns)
62 {
63 continue;
64 }
65
66 error = Get<NetworkData::Leader>().GetContext(AsCoreType(&config.mPrefix.mPrefix), lowpanContext);
67
68 if ((error != kErrorNone) || (lowpanContext.mContextId != contextId))
69 {
70 continue;
71 }
72
73 found = true;
74 break;
75 }
76
77 if (!found)
78 {
79 Get<ThreadNetif>().RemoveUnicastAddress(mAloc);
80 FreeAloc();
81 }
82 }
83
84 VerifyOrExit(!IsAlocInUse());
85
86 iterator = NetworkData::kIteratorInit;
87
88 while (Get<NetworkData::Leader>().GetNextOnMeshPrefix(iterator, rloc16, config) == kErrorNone)
89 {
90 if (!config.mNdDns)
91 {
92 continue;
93 }
94
95 error = Get<NetworkData::Leader>().GetContext(AsCoreType(&config.mPrefix.mPrefix), lowpanContext);
96
97 if (error == kErrorNone)
98 {
99 uint16_t aloc16 = Mle::kAloc16NeighborDiscoveryAgentStart + lowpanContext.mContextId - 1;
100
101 mAloc.InitAsThreadOrigin();
102 mAloc.GetAddress().SetToAnycastLocator(Get<Mle::MleRouter>().GetMeshLocalPrefix(), aloc16);
103 mAloc.mMeshLocal = true;
104 Get<ThreadNetif>().AddUnicastAddress(mAloc);
105 ExitNow();
106 }
107 }
108
109 exit:
110 return;
111 }
112
113 } // namespace NeighborDiscovery
114 } // namespace ot
115
116 #endif // OPENTHREAD_CONFIG_NEIGHBOR_DISCOVERY_AGENT_ENABLE
117
