xref: /aosp_15_r20/external/ot-br-posix/src/backbone_router/dua_routing_manager.cpp (revision 4a64e381480ef79f0532b2421e44e6ee336b8e0d)
1 /*
2  *    Copyright (c) 2020, 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  *   The file implements DUA routing functionalities.
32  */
33 
34 #include "backbone_router/dua_routing_manager.hpp"
35 
36 #if OTBR_ENABLE_DUA_ROUTING
37 
38 #include "common/code_utils.hpp"
39 
40 namespace otbr {
41 
42 namespace BackboneRouter {
43 
Enable(const Ip6Prefix & aDomainPrefix)44 void DuaRoutingManager::Enable(const Ip6Prefix &aDomainPrefix)
45 {
46     VerifyOrExit(!mEnabled);
47     mEnabled = true;
48 
49     mDomainPrefix = aDomainPrefix;
50 
51     AddDefaultRouteToThread();
52     AddPolicyRouteToBackbone();
53 
54 exit:
55     otbrLogResult(OTBR_ERROR_NONE, "DuaRoutingManager: %s", __FUNCTION__);
56 }
57 
Disable(void)58 void DuaRoutingManager::Disable(void)
59 {
60     VerifyOrExit(mEnabled);
61     mEnabled = false;
62 
63     DelDefaultRouteToThread();
64     DelPolicyRouteToBackbone();
65 
66 exit:
67     otbrLogResult(OTBR_ERROR_NONE, "DuaRoutingManager: %s", __FUNCTION__);
68 }
69 
AddDefaultRouteToThread(void)70 void DuaRoutingManager::AddDefaultRouteToThread(void)
71 {
72     SystemUtils::ExecuteCommand("ip -6 route add %s dev %s proto static metric 1", mDomainPrefix.ToString().c_str(),
73                                 mInterfaceName.c_str());
74 }
75 
DelDefaultRouteToThread(void)76 void DuaRoutingManager::DelDefaultRouteToThread(void)
77 {
78     SystemUtils::ExecuteCommand("ip -6 route del %s dev %s proto static metric 1", mDomainPrefix.ToString().c_str(),
79                                 mInterfaceName.c_str());
80 }
81 
AddPolicyRouteToBackbone(void)82 void DuaRoutingManager::AddPolicyRouteToBackbone(void)
83 {
84     // Packets from Thread interface use route table "openthread"
85     SystemUtils::ExecuteCommand("ip -6 rule add iif %s table openthread", mInterfaceName.c_str());
86     SystemUtils::ExecuteCommand("ip -6 route add %s dev %s proto static table openthread",
87                                 mDomainPrefix.ToString().c_str(), mBackboneInterfaceName.c_str());
88 }
89 
DelPolicyRouteToBackbone(void)90 void DuaRoutingManager::DelPolicyRouteToBackbone(void)
91 {
92     SystemUtils::ExecuteCommand("ip -6 rule del iif %s table openthread", mInterfaceName.c_str());
93     SystemUtils::ExecuteCommand("ip -6 route del %s dev %s proto static table openthread",
94                                 mDomainPrefix.ToString().c_str(), mBackboneInterfaceName.c_str());
95 }
96 
97 } // namespace BackboneRouter
98 } // namespace otbr
99 
100 #endif // OTBR_ENABLE_DUA_ROUTING
101