212 lines
6.1 KiB
C++
212 lines
6.1 KiB
C++
/*
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* Copyright (c) 2020, The OpenThread Authors.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @file
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* This file includes implementations for ICMPv6 Router Advertisement.
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*
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*/
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#include "border_router/router_advertisement.hpp"
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#if OPENTHREAD_CONFIG_BORDER_ROUTING_ENABLE
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#include "common/as_core_type.hpp"
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#include "common/code_utils.hpp"
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namespace ot {
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namespace BorderRouter {
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namespace RouterAdv {
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const Option *Option::GetNextOption(const Option *aCurOption, const uint8_t *aBuffer, uint16_t aBufferLength)
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{
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const uint8_t *nextOption = nullptr;
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const uint8_t *bufferEnd = aBuffer + aBufferLength;
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VerifyOrExit(aBuffer != nullptr, nextOption = nullptr);
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if (aCurOption == nullptr)
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{
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nextOption = aBuffer;
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}
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else
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{
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nextOption = reinterpret_cast<const uint8_t *>(aCurOption) + aCurOption->GetSize();
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}
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VerifyOrExit(nextOption + sizeof(Option) <= bufferEnd, nextOption = nullptr);
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VerifyOrExit(reinterpret_cast<const Option *>(nextOption)->GetSize() > 0, nextOption = nullptr);
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VerifyOrExit(nextOption + reinterpret_cast<const Option *>(nextOption)->GetSize() <= bufferEnd,
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nextOption = nullptr);
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exit:
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return reinterpret_cast<const Option *>(nextOption);
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}
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PrefixInfoOption::PrefixInfoOption(void)
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: Option(Type::kPrefixInfo, sizeof(*this) / kLengthUnit)
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, mPrefixLength(0)
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, mReserved1(0)
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, mValidLifetime(0)
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, mPreferredLifetime(0)
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, mReserved2(0)
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{
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OT_UNUSED_VARIABLE(mReserved2);
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mPrefix.Clear();
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}
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void PrefixInfoOption::SetOnLink(bool aOnLink)
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{
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if (aOnLink)
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{
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mReserved1 |= kOnLinkFlagMask;
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}
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else
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{
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mReserved1 &= ~kOnLinkFlagMask;
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}
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}
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void PrefixInfoOption::SetAutoAddrConfig(bool aAutoAddrConfig)
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{
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if (aAutoAddrConfig)
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{
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mReserved1 |= kAutoConfigFlagMask;
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}
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else
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{
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mReserved1 &= ~kAutoConfigFlagMask;
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}
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}
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void PrefixInfoOption::SetPrefix(const Ip6::Prefix &aPrefix)
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{
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mPrefixLength = aPrefix.mLength;
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mPrefix = AsCoreType(&aPrefix.mPrefix);
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}
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Ip6::Prefix PrefixInfoOption::GetPrefix(void) const
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{
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Ip6::Prefix prefix;
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prefix.Set(mPrefix.GetBytes(), mPrefixLength);
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return prefix;
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}
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RouteInfoOption::RouteInfoOption(void)
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: Option(Type::kRouteInfo, 0)
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, mPrefixLength(0)
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, mReserved(0)
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, mRouteLifetime(0)
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{
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OT_UNUSED_VARIABLE(mReserved);
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mPrefix.Clear();
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}
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void RouteInfoOption::SetPreference(RoutePreference aPreference)
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{
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mReserved &= ~kPreferenceMask;
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mReserved |= (NetworkData::RoutePreferenceToValue(aPreference) << kPreferenceOffset) & kPreferenceMask;
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}
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RouteInfoOption::RoutePreference RouteInfoOption::GetPreference(void) const
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{
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return NetworkData::RoutePreferenceFromValue((mReserved & kPreferenceMask) >> kPreferenceOffset);
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}
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void RouteInfoOption::SetPrefix(const Ip6::Prefix &aPrefix)
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{
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// The total length (in bytes) of a Router Information Option
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// is: (8 bytes fixed option header) + (0, 8, or 16 bytes prefix).
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// Because the length of the option must be padded with 8 bytes,
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// the length of the prefix (in bits) must be padded with 64 bits.
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SetLength((aPrefix.mLength + kLengthUnit * CHAR_BIT - 1) / (kLengthUnit * CHAR_BIT) + 1);
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mPrefixLength = aPrefix.mLength;
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mPrefix = AsCoreType(&aPrefix.mPrefix);
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}
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Ip6::Prefix RouteInfoOption::GetPrefix(void) const
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{
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Ip6::Prefix prefix;
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prefix.Set(mPrefix.GetBytes(), mPrefixLength);
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return prefix;
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}
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bool RouteInfoOption::IsValid(void) const
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{
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return (GetLength() == 1 || GetLength() == 2 || GetLength() == 3) &&
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(mPrefixLength <= OT_IP6_ADDRESS_SIZE * CHAR_BIT) && NetworkData::IsRoutePreferenceValid(GetPreference());
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}
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void RouterAdvMessage::SetToDefault(void)
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{
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mHeader.Clear();
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mHeader.SetType(Ip6::Icmp::Header::kTypeRouterAdvert);
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mReachableTime = 0;
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mRetransTimer = 0;
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}
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const RouterAdvMessage &RouterAdvMessage::operator=(const RouterAdvMessage &aOther)
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{
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mHeader = aOther.mHeader;
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// Set zero value and let platform do the calculation.
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mHeader.SetChecksum(0);
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mReachableTime = aOther.mReachableTime;
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mRetransTimer = aOther.mRetransTimer;
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return *this;
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}
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bool RouterAdvMessage::operator==(const RouterAdvMessage &aOther) const
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{
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return memcmp(&mHeader.mData, &aOther.mHeader.mData, sizeof(mHeader.mData)) == 0 &&
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mReachableTime == aOther.mReachableTime && mRetransTimer == aOther.mRetransTimer;
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}
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RouterSolicitMessage::RouterSolicitMessage(void)
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{
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mHeader.Clear();
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mHeader.SetType(Ip6::Icmp::Header::kTypeRouterSolicit);
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}
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} // namespace RouterAdv
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} // namespace BorderRouter
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} // namespace ot
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#endif // OPENTHREAD_CONFIG_BORDER_ROUTING_ENABLE
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