| /* |
| * Copyright (c) 2016, 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 IPv6 networking. |
| */ |
| |
| #include "ip6.hpp" |
| |
| #include "common/code_utils.hpp" |
| #include "common/debug.hpp" |
| #include "common/instance.hpp" |
| #include "common/locator-getters.hpp" |
| #include "common/logging.hpp" |
| #include "common/message.hpp" |
| #include "common/random.hpp" |
| #include "net/icmp6.hpp" |
| #include "net/ip6_address.hpp" |
| #include "net/netif.hpp" |
| #include "net/udp6.hpp" |
| #include "thread/mle.hpp" |
| |
| namespace ot { |
| namespace Ip6 { |
| |
| Ip6::Ip6(Instance &aInstance) |
| : InstanceLocator(aInstance) |
| , mForwardingEnabled(false) |
| , mIsReceiveIp6FilterEnabled(false) |
| , mReceiveIp6DatagramCallback(NULL) |
| , mReceiveIp6DatagramCallbackContext(NULL) |
| , mSendQueue() |
| , mSendQueueTask(aInstance, HandleSendQueue, this) |
| , mIcmp(aInstance) |
| , mUdp(aInstance) |
| , mMpl(aInstance) |
| #if OPENTHREAD_CONFIG_IP6_FRAGMENTATION_ENABLE |
| , mTimer(aInstance, &Ip6::HandleTimer, this) |
| #endif |
| { |
| } |
| |
| Message *Ip6::NewMessage(uint16_t aReserved, const otMessageSettings *aSettings) |
| { |
| return Get<MessagePool>().New(Message::kTypeIp6, |
| sizeof(Header) + sizeof(HopByHopHeader) + sizeof(OptionMpl) + aReserved, aSettings); |
| } |
| |
| Message *Ip6::NewMessage(const uint8_t *aData, uint16_t aDataLength, const otMessageSettings *aSettings) |
| { |
| otMessageSettings settings = {true, OT_MESSAGE_PRIORITY_NORMAL}; |
| Message * message = NULL; |
| |
| if (aSettings != NULL) |
| { |
| settings = *aSettings; |
| } |
| |
| SuccessOrExit(GetDatagramPriority(aData, aDataLength, *reinterpret_cast<uint8_t *>(&settings.mPriority))); |
| VerifyOrExit((message = Get<MessagePool>().New(Message::kTypeIp6, 0, &settings)) != NULL); |
| |
| if (message->Append(aData, aDataLength) != OT_ERROR_NONE) |
| { |
| message->Free(); |
| message = NULL; |
| } |
| |
| exit: |
| return message; |
| } |
| |
| uint8_t Ip6::DscpToPriority(uint8_t aDscp) |
| { |
| uint8_t priority; |
| uint8_t cs = aDscp & kDscpCsMask; |
| |
| switch (cs) |
| { |
| case kDscpCs1: |
| case kDscpCs2: |
| priority = Message::kPriorityLow; |
| break; |
| |
| case kDscpCs0: |
| case kDscpCs3: |
| priority = Message::kPriorityNormal; |
| break; |
| |
| case kDscpCs4: |
| case kDscpCs5: |
| case kDscpCs6: |
| case kDscpCs7: |
| priority = Message::kPriorityHigh; |
| break; |
| |
| default: |
| priority = Message::kPriorityNormal; |
| break; |
| } |
| |
| return priority; |
| } |
| |
| uint8_t Ip6::PriorityToDscp(uint8_t aPriority) |
| { |
| uint8_t dscp = kDscpCs0; |
| |
| switch (aPriority) |
| { |
| case Message::kPriorityLow: |
| dscp = kDscpCs1; |
| break; |
| |
| case Message::kPriorityNormal: |
| dscp = kDscpCs0; |
| break; |
| |
| case Message::kPriorityHigh: |
| dscp = kDscpCs4; |
| break; |
| } |
| |
| return dscp; |
| } |
| |
| otError Ip6::GetDatagramPriority(const uint8_t *aData, uint16_t aDataLen, uint8_t &aPriority) |
| { |
| otError error = OT_ERROR_NONE; |
| const Header *header; |
| |
| VerifyOrExit((aData != NULL) && (aDataLen >= sizeof(Header)), error = OT_ERROR_INVALID_ARGS); |
| |
| header = reinterpret_cast<const Header *>(aData); |
| VerifyOrExit(header->IsValid(), error = OT_ERROR_PARSE); |
| VerifyOrExit(sizeof(Header) + header->GetPayloadLength() == aDataLen, error = OT_ERROR_PARSE); |
| |
| aPriority = DscpToPriority(header->GetDscp()); |
| |
| exit: |
| return error; |
| } |
| |
| uint16_t Ip6::UpdateChecksum(uint16_t aChecksum, const Address &aAddress) |
| { |
| return Message::UpdateChecksum(aChecksum, aAddress.mFields.m8, sizeof(aAddress)); |
| } |
| |
| uint16_t Ip6::ComputePseudoheaderChecksum(const Address &aSource, |
| const Address &aDestination, |
| uint16_t aLength, |
| uint8_t aProto) |
| { |
| uint16_t checksum; |
| |
| checksum = Message::UpdateChecksum(0, aLength); |
| checksum = Message::UpdateChecksum(checksum, static_cast<uint16_t>(aProto)); |
| checksum = UpdateChecksum(checksum, aSource); |
| checksum = UpdateChecksum(checksum, aDestination); |
| |
| return checksum; |
| } |
| |
| void Ip6::SetReceiveDatagramCallback(otIp6ReceiveCallback aCallback, void *aCallbackContext) |
| { |
| mReceiveIp6DatagramCallback = aCallback; |
| mReceiveIp6DatagramCallbackContext = aCallbackContext; |
| } |
| |
| otError Ip6::AddMplOption(Message &aMessage, Header &aHeader) |
| { |
| otError error = OT_ERROR_NONE; |
| HopByHopHeader hbhHeader; |
| OptionMpl mplOption; |
| OptionPadN padOption; |
| |
| hbhHeader.SetNextHeader(aHeader.GetNextHeader()); |
| hbhHeader.SetLength(0); |
| mMpl.InitOption(mplOption, aHeader.GetSource()); |
| |
| // Mpl option may require two bytes padding. |
| if ((mplOption.GetTotalLength() + sizeof(hbhHeader)) % 8) |
| { |
| padOption.Init(2); |
| SuccessOrExit(error = aMessage.Prepend(&padOption, padOption.GetTotalLength())); |
| } |
| |
| SuccessOrExit(error = aMessage.Prepend(&mplOption, mplOption.GetTotalLength())); |
| SuccessOrExit(error = aMessage.Prepend(&hbhHeader, sizeof(hbhHeader))); |
| aHeader.SetPayloadLength(aHeader.GetPayloadLength() + sizeof(hbhHeader) + sizeof(mplOption)); |
| aHeader.SetNextHeader(kProtoHopOpts); |
| |
| exit: |
| return error; |
| } |
| |
| otError Ip6::AddTunneledMplOption(Message &aMessage, Header &aHeader, MessageInfo &aMessageInfo) |
| { |
| otError error = OT_ERROR_NONE; |
| Header tunnelHeader; |
| const NetifUnicastAddress *source; |
| MessageInfo messageInfo(aMessageInfo); |
| |
| // Use IP-in-IP encapsulation (RFC2473) and ALL_MPL_FORWARDERS address. |
| messageInfo.GetPeerAddr().Clear(); |
| messageInfo.GetPeerAddr().mFields.m16[0] = HostSwap16(0xff03); |
| messageInfo.GetPeerAddr().mFields.m16[7] = HostSwap16(0x00fc); |
| |
| tunnelHeader.Init(); |
| tunnelHeader.SetHopLimit(static_cast<uint8_t>(kDefaultHopLimit)); |
| tunnelHeader.SetPayloadLength(aHeader.GetPayloadLength() + sizeof(tunnelHeader)); |
| tunnelHeader.SetDestination(messageInfo.GetPeerAddr()); |
| tunnelHeader.SetNextHeader(kProtoIp6); |
| |
| VerifyOrExit((source = SelectSourceAddress(messageInfo)) != NULL, error = OT_ERROR_INVALID_SOURCE_ADDRESS); |
| |
| tunnelHeader.SetSource(source->GetAddress()); |
| |
| SuccessOrExit(error = AddMplOption(aMessage, tunnelHeader)); |
| SuccessOrExit(error = aMessage.Prepend(&tunnelHeader, sizeof(tunnelHeader))); |
| |
| exit: |
| return error; |
| } |
| |
| otError Ip6::InsertMplOption(Message &aMessage, Header &aHeader, MessageInfo &aMessageInfo) |
| { |
| otError error = OT_ERROR_NONE; |
| |
| VerifyOrExit(aHeader.GetDestination().IsMulticast() && |
| aHeader.GetDestination().GetScope() >= Address::kRealmLocalScope); |
| |
| if (aHeader.GetDestination().IsRealmLocalMulticast()) |
| { |
| aMessage.RemoveHeader(sizeof(aHeader)); |
| |
| if (aHeader.GetNextHeader() == kProtoHopOpts) |
| { |
| HopByHopHeader hbh; |
| uint16_t hbhLength = 0; |
| OptionMpl mplOption; |
| |
| // read existing hop-by-hop option header |
| aMessage.Read(0, sizeof(hbh), &hbh); |
| hbhLength = (hbh.GetLength() + 1) * 8; |
| |
| VerifyOrExit(hbhLength <= aHeader.GetPayloadLength(), error = OT_ERROR_PARSE); |
| |
| // increase existing hop-by-hop option header length by 8 bytes |
| hbh.SetLength(hbh.GetLength() + 1); |
| aMessage.Write(0, sizeof(hbh), &hbh); |
| |
| // make space for MPL Option + padding by shifting hop-by-hop option header |
| SuccessOrExit(error = aMessage.Prepend(NULL, 8)); |
| aMessage.CopyTo(8, 0, hbhLength, aMessage); |
| |
| // insert MPL Option |
| mMpl.InitOption(mplOption, aHeader.GetSource()); |
| aMessage.Write(hbhLength, mplOption.GetTotalLength(), &mplOption); |
| |
| // insert Pad Option (if needed) |
| if (mplOption.GetTotalLength() % 8) |
| { |
| OptionPadN padOption; |
| padOption.Init(8 - (mplOption.GetTotalLength() % 8)); |
| aMessage.Write(hbhLength + mplOption.GetTotalLength(), padOption.GetTotalLength(), &padOption); |
| } |
| |
| // increase IPv6 Payload Length |
| aHeader.SetPayloadLength(aHeader.GetPayloadLength() + 8); |
| } |
| else |
| { |
| SuccessOrExit(error = AddMplOption(aMessage, aHeader)); |
| } |
| |
| SuccessOrExit(error = aMessage.Prepend(&aHeader, sizeof(aHeader))); |
| } |
| else |
| { |
| if (aHeader.GetDestination().IsMulticastLargerThanRealmLocal() && |
| Get<Mle::MleRouter>().HasSleepyChildrenSubscribed(aHeader.GetDestination())) |
| { |
| Message *messageCopy = NULL; |
| |
| if ((messageCopy = aMessage.Clone()) != NULL) |
| { |
| HandleDatagram(*messageCopy, NULL, NULL, true); |
| otLogInfoIp6("Message copy for indirect transmission to sleepy children"); |
| } |
| else |
| { |
| otLogWarnIp6("No enough buffer for message copy for indirect transmission to sleepy children"); |
| } |
| } |
| |
| SuccessOrExit(error = AddTunneledMplOption(aMessage, aHeader, aMessageInfo)); |
| } |
| |
| exit: |
| return error; |
| } |
| |
| otError Ip6::RemoveMplOption(Message &aMessage) |
| { |
| otError error = OT_ERROR_NONE; |
| Header ip6Header; |
| HopByHopHeader hbh; |
| uint16_t offset; |
| uint16_t endOffset; |
| uint16_t mplOffset = 0; |
| uint8_t mplLength = 0; |
| bool remove = false; |
| |
| offset = 0; |
| aMessage.Read(offset, sizeof(ip6Header), &ip6Header); |
| offset += sizeof(ip6Header); |
| VerifyOrExit(ip6Header.GetNextHeader() == kProtoHopOpts); |
| |
| aMessage.Read(offset, sizeof(hbh), &hbh); |
| endOffset = offset + (hbh.GetLength() + 1) * 8; |
| VerifyOrExit(aMessage.GetLength() >= endOffset, error = OT_ERROR_PARSE); |
| |
| offset += sizeof(hbh); |
| |
| while (offset < endOffset) |
| { |
| OptionHeader option; |
| |
| aMessage.Read(offset, sizeof(option), &option); |
| |
| switch (option.GetType()) |
| { |
| case OptionMpl::kType: |
| // if multiple MPL options exist, discard packet |
| VerifyOrExit(mplOffset == 0, error = OT_ERROR_PARSE); |
| |
| mplOffset = offset; |
| mplLength = option.GetLength(); |
| |
| VerifyOrExit(mplLength <= sizeof(OptionMpl) - sizeof(OptionHeader), error = OT_ERROR_PARSE); |
| |
| if (mplOffset == sizeof(ip6Header) + sizeof(hbh) && hbh.GetLength() == 0) |
| { |
| // first and only IPv6 Option, remove IPv6 HBH Option header |
| remove = true; |
| } |
| else if (mplOffset + 8 == endOffset) |
| { |
| // last IPv6 Option, remove last 8 bytes |
| remove = true; |
| } |
| |
| offset += sizeof(option) + option.GetLength(); |
| break; |
| |
| case OptionPad1::kType: |
| offset += sizeof(OptionPad1); |
| break; |
| |
| case OptionPadN::kType: |
| offset += sizeof(option) + option.GetLength(); |
| break; |
| |
| default: |
| // encountered another option, now just replace MPL Option with PadN |
| remove = false; |
| offset += sizeof(option) + option.GetLength(); |
| break; |
| } |
| } |
| |
| // verify that IPv6 Options header is properly formed |
| VerifyOrExit(offset == endOffset, error = OT_ERROR_PARSE); |
| |
| if (remove) |
| { |
| // last IPv6 Option, shrink HBH Option header |
| uint8_t buf[8]; |
| |
| offset = endOffset - sizeof(buf); |
| |
| while (offset >= sizeof(buf)) |
| { |
| aMessage.Read(offset - sizeof(buf), sizeof(buf), buf); |
| aMessage.Write(offset, sizeof(buf), buf); |
| offset -= sizeof(buf); |
| } |
| |
| aMessage.RemoveHeader(sizeof(buf)); |
| |
| if (mplOffset == sizeof(ip6Header) + sizeof(hbh)) |
| { |
| // remove entire HBH header |
| ip6Header.SetNextHeader(hbh.GetNextHeader()); |
| } |
| else |
| { |
| // update HBH header length |
| hbh.SetLength(hbh.GetLength() - 1); |
| aMessage.Write(sizeof(ip6Header), sizeof(hbh), &hbh); |
| } |
| |
| ip6Header.SetPayloadLength(ip6Header.GetPayloadLength() - sizeof(buf)); |
| aMessage.Write(0, sizeof(ip6Header), &ip6Header); |
| } |
| else if (mplOffset != 0) |
| { |
| // replace MPL Option with PadN Option |
| OptionPadN padOption; |
| |
| padOption.Init(sizeof(OptionHeader) + mplLength); |
| aMessage.Write(mplOffset, padOption.GetTotalLength(), &padOption); |
| } |
| |
| exit: |
| return error; |
| } |
| |
| void Ip6::EnqueueDatagram(Message &aMessage) |
| { |
| mSendQueue.Enqueue(aMessage); |
| mSendQueueTask.Post(); |
| } |
| |
| otError Ip6::SendDatagram(Message &aMessage, MessageInfo &aMessageInfo, uint8_t aIpProto) |
| { |
| otError error = OT_ERROR_NONE; |
| Header header; |
| uint16_t payloadLength = aMessage.GetLength(); |
| uint16_t checksum; |
| const NetifUnicastAddress *source; |
| |
| header.Init(); |
| header.SetDscp(PriorityToDscp(aMessage.GetPriority())); |
| header.SetPayloadLength(payloadLength); |
| header.SetNextHeader(aIpProto); |
| |
| if (aMessageInfo.GetHopLimit() != 0 || aMessageInfo.ShouldAllowZeroHopLimit()) |
| { |
| header.SetHopLimit(aMessageInfo.GetHopLimit()); |
| } |
| else |
| { |
| header.SetHopLimit(static_cast<uint8_t>(kDefaultHopLimit)); |
| } |
| |
| if (aMessageInfo.GetSockAddr().IsUnspecified() || aMessageInfo.GetSockAddr().IsMulticast()) |
| { |
| VerifyOrExit((source = SelectSourceAddress(aMessageInfo)) != NULL, error = OT_ERROR_INVALID_SOURCE_ADDRESS); |
| header.SetSource(source->GetAddress()); |
| } |
| else |
| { |
| header.SetSource(aMessageInfo.GetSockAddr()); |
| } |
| |
| header.SetDestination(aMessageInfo.GetPeerAddr()); |
| |
| if (aMessageInfo.GetPeerAddr().IsRealmLocalMulticast()) |
| { |
| SuccessOrExit(error = AddMplOption(aMessage, header)); |
| } |
| |
| SuccessOrExit(error = aMessage.Prepend(&header, sizeof(header))); |
| |
| // compute checksum |
| checksum = ComputePseudoheaderChecksum(header.GetSource(), header.GetDestination(), payloadLength, aIpProto); |
| |
| switch (aIpProto) |
| { |
| case kProtoUdp: |
| mUdp.UpdateChecksum(aMessage, checksum); |
| break; |
| |
| case kProtoIcmp6: |
| mIcmp.UpdateChecksum(aMessage, checksum); |
| break; |
| |
| default: |
| break; |
| } |
| |
| if (aMessageInfo.GetPeerAddr().IsMulticastLargerThanRealmLocal()) |
| { |
| if (Get<Mle::MleRouter>().HasSleepyChildrenSubscribed(header.GetDestination())) |
| { |
| Message *messageCopy = NULL; |
| |
| if ((messageCopy = aMessage.Clone()) != NULL) |
| { |
| otLogInfoIp6("Message copy for indirect transmission to sleepy children"); |
| EnqueueDatagram(*messageCopy); |
| } |
| else |
| { |
| otLogWarnIp6("No enough buffer for message copy for indirect transmission to sleepy children"); |
| } |
| } |
| |
| SuccessOrExit(error = AddTunneledMplOption(aMessage, header, aMessageInfo)); |
| } |
| |
| exit: |
| |
| if (error == OT_ERROR_NONE) |
| { |
| if (aMessage.GetLength() > kMaxDatagramLength) |
| { |
| error = FragmentDatagram(aMessage, aIpProto); |
| } |
| else |
| { |
| EnqueueDatagram(aMessage); |
| } |
| } |
| |
| return error; |
| } |
| |
| void Ip6::HandleSendQueue(Tasklet &aTasklet) |
| { |
| aTasklet.GetOwner<Ip6>().HandleSendQueue(); |
| } |
| |
| void Ip6::HandleSendQueue(void) |
| { |
| Message *message; |
| |
| while ((message = mSendQueue.GetHead()) != NULL) |
| { |
| mSendQueue.Dequeue(*message); |
| HandleDatagram(*message, NULL, NULL, false); |
| } |
| } |
| |
| otError Ip6::HandleOptions(Message &aMessage, Header &aHeader, bool &aForward) |
| { |
| otError error = OT_ERROR_NONE; |
| HopByHopHeader hbhHeader; |
| OptionHeader optionHeader; |
| uint16_t endOffset; |
| |
| VerifyOrExit(aMessage.Read(aMessage.GetOffset(), sizeof(hbhHeader), &hbhHeader) == sizeof(hbhHeader), |
| error = OT_ERROR_PARSE); |
| endOffset = aMessage.GetOffset() + (hbhHeader.GetLength() + 1) * 8; |
| |
| VerifyOrExit(endOffset <= aMessage.GetLength(), error = OT_ERROR_PARSE); |
| |
| aMessage.MoveOffset(sizeof(optionHeader)); |
| |
| while (aMessage.GetOffset() < endOffset) |
| { |
| VerifyOrExit(aMessage.Read(aMessage.GetOffset(), sizeof(optionHeader), &optionHeader) == sizeof(optionHeader), |
| error = OT_ERROR_PARSE); |
| |
| if (optionHeader.GetType() == OptionPad1::kType) |
| { |
| aMessage.MoveOffset(sizeof(OptionPad1)); |
| continue; |
| } |
| |
| VerifyOrExit(aMessage.GetOffset() + sizeof(optionHeader) + optionHeader.GetLength() <= endOffset, |
| error = OT_ERROR_PARSE); |
| |
| switch (optionHeader.GetType()) |
| { |
| case OptionMpl::kType: |
| SuccessOrExit(error = mMpl.ProcessOption(aMessage, aHeader.GetSource(), aForward)); |
| break; |
| |
| default: |
| switch (optionHeader.GetAction()) |
| { |
| case OptionHeader::kActionSkip: |
| break; |
| |
| case OptionHeader::kActionDiscard: |
| ExitNow(error = OT_ERROR_DROP); |
| |
| case OptionHeader::kActionForceIcmp: |
| // TODO: send icmp error |
| ExitNow(error = OT_ERROR_DROP); |
| |
| case OptionHeader::kActionIcmp: |
| // TODO: send icmp error |
| ExitNow(error = OT_ERROR_DROP); |
| } |
| |
| break; |
| } |
| |
| aMessage.MoveOffset(sizeof(optionHeader) + optionHeader.GetLength()); |
| } |
| |
| exit: |
| return error; |
| } |
| |
| #if OPENTHREAD_CONFIG_IP6_FRAGMENTATION_ENABLE |
| otError Ip6::FragmentDatagram(Message &aMessage, uint8_t aIpProto) |
| { |
| otError error = OT_ERROR_NONE; |
| Header header; |
| FragmentHeader fragmentHeader; |
| Message * fragment = NULL; |
| uint16_t fragmentCnt = 0; |
| uint16_t payloadFragment = 0; |
| uint16_t offset = 0; |
| int assertValue = 0; |
| |
| uint16_t maxPayloadFragment = |
| FragmentHeader::MakeDivisibleByEight(kMinimalMtu - aMessage.GetOffset() - sizeof(fragmentHeader)); |
| uint16_t payloadLeft = aMessage.GetLength() - aMessage.GetOffset(); |
| |
| VerifyOrExit(aMessage.GetLength() <= kMaxAssembledDatagramLength, error = OT_ERROR_NO_BUFS); |
| |
| VerifyOrExit(aMessage.Read(0, sizeof(header), &header) == sizeof(header), error = OT_ERROR_PARSE); |
| header.SetNextHeader(kProtoFragment); |
| |
| fragmentHeader.Init(); |
| fragmentHeader.SetIdentification(Random::NonCrypto::GetUint32()); |
| fragmentHeader.SetNextHeader(aIpProto); |
| fragmentHeader.SetMoreFlag(); |
| |
| while (payloadLeft != 0) |
| { |
| if (payloadLeft < maxPayloadFragment) |
| { |
| fragmentHeader.ClearMoreFlag(); |
| |
| payloadFragment = payloadLeft; |
| payloadLeft = 0; |
| |
| otLogDebgIp6("Last Fragment"); |
| } |
| else |
| { |
| payloadLeft -= maxPayloadFragment; |
| payloadFragment = maxPayloadFragment; |
| } |
| |
| offset = fragmentCnt * FragmentHeader::BytesToFragmentOffset(maxPayloadFragment); |
| fragmentHeader.SetOffset(offset); |
| |
| VerifyOrExit((fragment = NewMessage(0)) != NULL, error = OT_ERROR_NO_BUFS); |
| SuccessOrExit(error = fragment->SetLength(aMessage.GetOffset() + sizeof(fragmentHeader) + payloadFragment)); |
| |
| header.SetPayloadLength(payloadFragment + sizeof(fragmentHeader)); |
| assertValue = fragment->Write(0, sizeof(header), &header); |
| assert(assertValue == sizeof(header)); |
| |
| SuccessOrExit(error = fragment->SetOffset(aMessage.GetOffset())); |
| assertValue = fragment->Write(aMessage.GetOffset(), sizeof(fragmentHeader), &fragmentHeader); |
| assert(assertValue == sizeof(fragmentHeader)); |
| |
| VerifyOrExit(aMessage.CopyTo(aMessage.GetOffset() + FragmentHeader::FragmentOffsetToBytes(offset), |
| aMessage.GetOffset() + sizeof(fragmentHeader), payloadFragment, |
| *fragment) == static_cast<int>(payloadFragment), |
| error = OT_ERROR_NO_BUFS); |
| |
| EnqueueDatagram(*fragment); |
| |
| fragmentCnt++; |
| fragment = NULL; |
| |
| otLogInfoIp6("Fragment %d with %d bytes sent", fragmentCnt, payloadFragment); |
| } |
| aMessage.Free(); |
| |
| exit: |
| |
| if (error == OT_ERROR_NO_BUFS) |
| { |
| otLogWarnIp6("No buffer for Ip6 fragmentation"); |
| } |
| |
| if (error != OT_ERROR_NONE && fragment != NULL) |
| { |
| fragment->Free(); |
| } |
| |
| return error; |
| } |
| |
| otError Ip6::HandleFragment(Message &aMessage, Netif *aNetif, MessageInfo &aMessageInfo, bool aFromNcpHost) |
| { |
| otError error = OT_ERROR_NONE; |
| Header header, headerBuffer; |
| FragmentHeader fragmentHeader; |
| Message * message = NULL; |
| uint16_t offset = 0; |
| uint16_t payloadFragment = 0; |
| int assertValue = 0; |
| bool isFragmented = true; |
| |
| VerifyOrExit(aMessage.Read(0, sizeof(header), &header) == sizeof(header), error = OT_ERROR_PARSE); |
| |
| VerifyOrExit(aMessage.Read(aMessage.GetOffset(), sizeof(fragmentHeader), &fragmentHeader) == sizeof(fragmentHeader), |
| error = OT_ERROR_PARSE); |
| |
| if (fragmentHeader.GetOffset() == 0 && !fragmentHeader.IsMoreFlagSet()) |
| { |
| isFragmented = false; |
| error = aMessage.MoveOffset(sizeof(fragmentHeader)); |
| |
| ExitNow(); |
| } |
| |
| for (message = mReassemblyList.GetHead(); message; message = message->GetNext()) |
| { |
| VerifyOrExit(message->Read(0, sizeof(headerBuffer), &headerBuffer) == sizeof(headerBuffer), |
| error = OT_ERROR_PARSE); |
| |
| if (message->GetDatagramTag() == fragmentHeader.GetIdentification() && |
| headerBuffer.GetSource() == header.GetSource() && headerBuffer.GetDestination() == header.GetDestination()) |
| { |
| break; |
| } |
| } |
| |
| offset = FragmentHeader::FragmentOffsetToBytes(fragmentHeader.GetOffset()); |
| payloadFragment = aMessage.GetLength() - aMessage.GetOffset() - sizeof(fragmentHeader); |
| |
| if (message == NULL) |
| { |
| VerifyOrExit((message = NewMessage(0)) != NULL, error = OT_ERROR_NO_BUFS); |
| SuccessOrExit(error = message->SetLength(aMessage.GetOffset())); |
| |
| message->SetTimeout(kIp6ReassemblyTimeout); |
| SuccessOrExit(error = message->SetOffset(0)); |
| message->SetDatagramTag(fragmentHeader.GetIdentification()); |
| |
| // copying the non-fragmentable header to the fragmentation buffer |
| assertValue = aMessage.CopyTo(0, 0, aMessage.GetOffset(), *message); |
| assert(assertValue == aMessage.GetOffset()); |
| |
| if (!mTimer.IsRunning()) |
| { |
| mTimer.Start(kStateUpdatePeriod); |
| } |
| |
| mReassemblyList.Enqueue(*message); |
| |
| otLogDebgIp6("start reassembly."); |
| } |
| |
| otLogInfoIp6("Fragment with id %d received > %d bytes, offset %d", message->GetDatagramTag(), payloadFragment, |
| offset); |
| |
| if (offset + payloadFragment + aMessage.GetOffset() > kMaxAssembledDatagramLength) |
| { |
| otLogWarnIp6("Package too large for fragment buffer"); |
| ExitNow(error = OT_ERROR_NO_BUFS); |
| } |
| |
| // increase message buffer if necessary |
| if (message->GetLength() < offset + payloadFragment + aMessage.GetOffset()) |
| { |
| SuccessOrExit(error = message->SetLength(offset + payloadFragment + aMessage.GetOffset())); |
| } |
| |
| // copy the fragment payload into the message buffer |
| assertValue = aMessage.CopyTo(aMessage.GetOffset() + sizeof(fragmentHeader), aMessage.GetOffset() + offset, |
| payloadFragment, *message); |
| assert(assertValue == static_cast<int>(payloadFragment)); |
| |
| // check if it is the last frame |
| if (!fragmentHeader.IsMoreFlagSet()) |
| { |
| // use the offset value for the whole ip message length |
| SuccessOrExit(error = message->SetOffset(offset + payloadFragment + aMessage.GetOffset())); |
| } |
| |
| if (message->GetOffset() >= message->GetLength()) |
| { |
| // creates the header for the reassembled ipv6 package |
| VerifyOrExit(aMessage.Read(0, sizeof(header), &header) == sizeof(header), error = OT_ERROR_PARSE); |
| header.SetPayloadLength(message->GetLength() - sizeof(header)); |
| header.SetNextHeader(fragmentHeader.GetNextHeader()); |
| assertValue = message->Write(0, sizeof(header), &header); |
| assert(assertValue == sizeof(header)); |
| |
| otLogDebgIp6("Reassembly complete."); |
| |
| mReassemblyList.Dequeue(*message); |
| |
| error = HandleDatagram(*message, aNetif, aMessageInfo.mLinkInfo, aFromNcpHost); |
| } |
| |
| exit: |
| if (error != OT_ERROR_DROP && error != OT_ERROR_NONE && isFragmented) |
| { |
| if (message != NULL) |
| { |
| mReassemblyList.Dequeue(*message); |
| message->Free(); |
| } |
| otLogWarnIp6("Reassembly failed: %s", otThreadErrorToString(error)); |
| } |
| if (isFragmented) |
| { |
| // drop all fragments, the payload is stored in the fragment buffer |
| error = OT_ERROR_DROP; |
| } |
| |
| return error; |
| } |
| |
| void Ip6::CleanupFragmentationBuffer(void) |
| { |
| for (Message *message = mReassemblyList.GetHead(); message;) |
| { |
| Message *next = message->GetNext(); |
| mReassemblyList.Dequeue(*message); |
| |
| message->Free(); |
| message = next; |
| } |
| } |
| |
| void Ip6::HandleTimer(Timer &aTimer) |
| { |
| aTimer.GetOwner<Ip6>().HandleUpdateTimer(); |
| } |
| |
| void Ip6::HandleUpdateTimer(void) |
| { |
| UpdateReassemblyList(); |
| |
| if (mReassemblyList.GetHead() != NULL) |
| { |
| mTimer.Start(kStateUpdatePeriod); |
| } |
| } |
| |
| void Ip6::UpdateReassemblyList(void) |
| { |
| Message *next; |
| |
| for (Message *message = mReassemblyList.GetHead(); message; message = next) |
| { |
| next = message->GetNext(); |
| |
| if (message->GetTimeout() > 0) |
| { |
| message->DecrementTimeout(); |
| } |
| else |
| { |
| otLogNoteIp6("Reassembly timeout."); |
| SendIcmpError(*message, IcmpHeader::kTypeTimeExceeded, IcmpHeader::kCodeFragmReasTimeEx); |
| |
| mReassemblyList.Dequeue(*message); |
| message->Free(); |
| } |
| } |
| } |
| |
| otError Ip6::SendIcmpError(Message &aMessage, IcmpHeader::Type aIcmpType, IcmpHeader::Code aIcmpCode) |
| { |
| otError error = OT_ERROR_NONE; |
| Header header; |
| MessageInfo messageInfo; |
| |
| VerifyOrExit(aMessage.Read(0, sizeof(header), &header) == sizeof(header), error = OT_ERROR_PARSE); |
| |
| messageInfo.SetPeerAddr(header.GetSource()); |
| messageInfo.SetSockAddr(header.GetDestination()); |
| messageInfo.SetHopLimit(header.GetHopLimit()); |
| messageInfo.SetLinkInfo(NULL); |
| |
| SuccessOrExit(error = mIcmp.SendError(aIcmpType, aIcmpCode, messageInfo, header)); |
| |
| exit: |
| return error; |
| } |
| |
| #else |
| otError Ip6::FragmentDatagram(Message &aMessage, uint8_t aIpProto) |
| { |
| OT_UNUSED_VARIABLE(aIpProto); |
| |
| EnqueueDatagram(aMessage); |
| |
| return OT_ERROR_NONE; |
| } |
| |
| otError Ip6::HandleFragment(Message &aMessage, Netif *aNetif, MessageInfo &aMessageInfo, bool aFromNcpHost) |
| { |
| OT_UNUSED_VARIABLE(aNetif); |
| OT_UNUSED_VARIABLE(aMessageInfo); |
| OT_UNUSED_VARIABLE(aFromNcpHost); |
| |
| otError error = OT_ERROR_NONE; |
| FragmentHeader fragmentHeader; |
| |
| VerifyOrExit(aMessage.Read(aMessage.GetOffset(), sizeof(fragmentHeader), &fragmentHeader) == sizeof(fragmentHeader), |
| error = OT_ERROR_PARSE); |
| |
| VerifyOrExit(fragmentHeader.GetOffset() == 0 && !fragmentHeader.IsMoreFlagSet(), error = OT_ERROR_DROP); |
| |
| aMessage.MoveOffset(sizeof(fragmentHeader)); |
| |
| exit: |
| return error; |
| } |
| #endif // OPENTHREAD_CONFIG_IP6_FRAGMENTATION_ENABLE |
| |
| otError Ip6::HandleExtensionHeaders(Message & aMessage, |
| Netif * aNetif, |
| MessageInfo &aMessageInfo, |
| Header & aHeader, |
| uint8_t & aNextHeader, |
| bool aForward, |
| bool aFromNcpHost, |
| bool aReceive) |
| { |
| otError error = OT_ERROR_NONE; |
| ExtensionHeader extHeader; |
| |
| while (aReceive || aNextHeader == kProtoHopOpts) |
| { |
| VerifyOrExit(aMessage.Read(aMessage.GetOffset(), sizeof(extHeader), &extHeader) == sizeof(extHeader), |
| error = OT_ERROR_PARSE); |
| |
| switch (aNextHeader) |
| { |
| case kProtoHopOpts: |
| SuccessOrExit(error = HandleOptions(aMessage, aHeader, aForward)); |
| break; |
| |
| case kProtoFragment: |
| SuccessOrExit(error = HandleFragment(aMessage, aNetif, aMessageInfo, aFromNcpHost)); |
| break; |
| |
| case kProtoDstOpts: |
| SuccessOrExit(error = HandleOptions(aMessage, aHeader, aForward)); |
| break; |
| |
| case kProtoIp6: |
| ExitNow(); |
| |
| case kProtoRouting: |
| case kProtoNone: |
| ExitNow(error = OT_ERROR_DROP); |
| |
| default: |
| ExitNow(); |
| } |
| |
| aNextHeader = static_cast<uint8_t>(extHeader.GetNextHeader()); |
| } |
| |
| exit: |
| return error; |
| } |
| |
| otError Ip6::HandlePayload(Message &aMessage, MessageInfo &aMessageInfo, uint8_t aIpProto) |
| { |
| otError error = OT_ERROR_NONE; |
| |
| switch (aIpProto) |
| { |
| case kProtoUdp: |
| error = mUdp.HandleMessage(aMessage, aMessageInfo); |
| if (error == OT_ERROR_DROP) |
| { |
| otLogNoteIp6("Error UDP Checksum"); |
| } |
| ExitNow(); |
| |
| case kProtoIcmp6: |
| ExitNow(error = mIcmp.HandleMessage(aMessage, aMessageInfo)); |
| } |
| |
| exit: |
| return error; |
| } |
| |
| otError Ip6::ProcessReceiveCallback(const Message & aMessage, |
| const MessageInfo &aMessageInfo, |
| uint8_t aIpProto, |
| bool aFromNcpHost) |
| { |
| otError error = OT_ERROR_NONE; |
| Message *messageCopy = NULL; |
| |
| VerifyOrExit(!aFromNcpHost, error = OT_ERROR_NO_ROUTE); |
| VerifyOrExit(mReceiveIp6DatagramCallback != NULL, error = OT_ERROR_NO_ROUTE); |
| |
| if (mIsReceiveIp6FilterEnabled) |
| { |
| // do not pass messages sent to an RLOC/ALOC, except Service Locator |
| VerifyOrExit( |
| (!aMessageInfo.GetSockAddr().IsRoutingLocator() && !aMessageInfo.GetSockAddr().IsAnycastRoutingLocator()) || |
| aMessageInfo.GetSockAddr().IsAnycastServiceLocator(), |
| error = OT_ERROR_NO_ROUTE); |
| |
| switch (aIpProto) |
| { |
| case kProtoIcmp6: |
| if (mIcmp.ShouldHandleEchoRequest(aMessageInfo)) |
| { |
| IcmpHeader icmp; |
| aMessage.Read(aMessage.GetOffset(), sizeof(icmp), &icmp); |
| |
| // do not pass ICMP Echo Request messages |
| VerifyOrExit(icmp.GetType() != IcmpHeader::kTypeEchoRequest, error = OT_ERROR_DROP); |
| } |
| |
| break; |
| |
| case kProtoUdp: |
| { |
| UdpHeader udp; |
| aMessage.Read(aMessage.GetOffset(), sizeof(udp), &udp); |
| |
| switch (udp.GetDestinationPort()) |
| { |
| case Mle::kUdpPort: |
| |
| // do not pass MLE messages |
| if (aMessageInfo.GetSockAddr().IsLinkLocal() || aMessageInfo.GetSockAddr().IsLinkLocalMulticast()) |
| { |
| ExitNow(error = OT_ERROR_NO_ROUTE); |
| } |
| |
| break; |
| |
| #if OPENTHREAD_CONFIG_PLATFORM_UDP_ENABLE == 0 |
| case kCoapUdpPort: |
| |
| // do not pass TMF messages |
| if (Get<ThreadNetif>().IsTmfMessage(aMessageInfo)) |
| { |
| ExitNow(error = OT_ERROR_NO_ROUTE); |
| } |
| |
| break; |
| #endif // OPENTHREAD_CONFIG_PLATFORM_UDP_ENABLE |
| |
| default: |
| #if OPENTHREAD_FTD |
| if (udp.GetDestinationPort() == Get<MeshCoP::JoinerRouter>().GetJoinerUdpPort()) |
| { |
| ExitNow(error = OT_ERROR_NO_ROUTE); |
| } |
| #endif |
| break; |
| } |
| |
| break; |
| } |
| |
| default: |
| break; |
| } |
| } |
| |
| // make a copy of the datagram to pass to host |
| VerifyOrExit((messageCopy = aMessage.Clone()) != NULL, error = OT_ERROR_NO_BUFS); |
| RemoveMplOption(*messageCopy); |
| mReceiveIp6DatagramCallback(messageCopy, mReceiveIp6DatagramCallbackContext); |
| |
| exit: |
| |
| switch (error) |
| { |
| case OT_ERROR_NO_BUFS: |
| otLogWarnIp6("Failed to pass up message (len: %d) to host - out of message buffer.", aMessage.GetLength()); |
| break; |
| |
| case OT_ERROR_DROP: |
| otLogNoteIp6("Dropping message (len: %d) from local host since next hop is the host.", aMessage.GetLength()); |
| break; |
| |
| default: |
| break; |
| } |
| |
| return error; |
| } |
| |
| otError Ip6::SendRaw(Message &aMessage) |
| { |
| otError error = OT_ERROR_NONE; |
| Header header; |
| MessageInfo messageInfo; |
| bool freed = false; |
| |
| SuccessOrExit(error = header.Init(aMessage)); |
| |
| messageInfo.SetPeerAddr(header.GetSource()); |
| messageInfo.SetSockAddr(header.GetDestination()); |
| messageInfo.SetHopLimit(header.GetHopLimit()); |
| messageInfo.SetLinkInfo(NULL); |
| |
| if (header.GetDestination().IsMulticast()) |
| { |
| SuccessOrExit(error = InsertMplOption(aMessage, header, messageInfo)); |
| } |
| |
| error = HandleDatagram(aMessage, NULL, NULL, true); |
| freed = true; |
| |
| exit: |
| |
| if (!freed) |
| { |
| aMessage.Free(); |
| } |
| |
| return error; |
| } |
| |
| otError Ip6::HandleDatagram(Message &aMessage, Netif *aNetif, const void *aLinkMessageInfo, bool aFromNcpHost) |
| { |
| otError error = OT_ERROR_NONE; |
| MessageInfo messageInfo; |
| Header header; |
| bool receive = false; |
| bool forward = false; |
| bool tunnel = false; |
| bool multicastPromiscuous = false; |
| uint8_t nextHeader; |
| uint8_t hopLimit; |
| |
| SuccessOrExit(error = header.Init(aMessage)); |
| |
| messageInfo.SetPeerAddr(header.GetSource()); |
| messageInfo.SetSockAddr(header.GetDestination()); |
| messageInfo.SetHopLimit(header.GetHopLimit()); |
| messageInfo.SetLinkInfo(aLinkMessageInfo); |
| |
| // determine destination of packet |
| if (header.GetDestination().IsMulticast()) |
| { |
| if (aNetif != NULL) |
| { |
| if (aNetif->IsMulticastSubscribed(header.GetDestination())) |
| { |
| receive = true; |
| } |
| else if (aNetif->IsMulticastPromiscuousEnabled()) |
| { |
| multicastPromiscuous = true; |
| } |
| |
| if (header.GetDestination().IsMulticastLargerThanRealmLocal() && |
| Get<Mle::MleRouter>().HasSleepyChildrenSubscribed(header.GetDestination())) |
| { |
| forward = true; |
| } |
| } |
| else |
| { |
| forward = true; |
| } |
| } |
| else |
| { |
| if (Get<ThreadNetif>().IsUnicastAddress(header.GetDestination())) |
| { |
| receive = true; |
| } |
| else if (!header.GetDestination().IsLinkLocal()) |
| { |
| forward = true; |
| } |
| else if (aNetif == NULL) |
| { |
| forward = true; |
| } |
| } |
| |
| aMessage.SetOffset(sizeof(header)); |
| |
| // process IPv6 Extension Headers |
| nextHeader = static_cast<uint8_t>(header.GetNextHeader()); |
| SuccessOrExit(error = HandleExtensionHeaders(aMessage, aNetif, messageInfo, header, nextHeader, forward, |
| aFromNcpHost, receive)); |
| |
| // process IPv6 Payload |
| if (receive) |
| { |
| if (nextHeader == kProtoIp6) |
| { |
| // Remove encapsulating header. |
| aMessage.RemoveHeader(aMessage.GetOffset()); |
| |
| HandleDatagram(aMessage, aNetif, aLinkMessageInfo, aFromNcpHost); |
| ExitNow(tunnel = true); |
| } |
| |
| ProcessReceiveCallback(aMessage, messageInfo, nextHeader, aFromNcpHost); |
| |
| SuccessOrExit(error = HandlePayload(aMessage, messageInfo, nextHeader)); |
| } |
| else if (multicastPromiscuous) |
| { |
| ProcessReceiveCallback(aMessage, messageInfo, nextHeader, aFromNcpHost); |
| } |
| |
| if (forward) |
| { |
| if (!ShouldForwardToThread(messageInfo)) |
| { |
| // try passing to host |
| SuccessOrExit(error = ProcessReceiveCallback(aMessage, messageInfo, nextHeader, aFromNcpHost)); |
| |
| // the caller transfers custody in the success case, so free the aMessage here |
| aMessage.Free(); |
| |
| ExitNow(); |
| } |
| |
| if (aNetif != NULL) |
| { |
| VerifyOrExit(mForwardingEnabled, forward = false); |
| header.SetHopLimit(header.GetHopLimit() - 1); |
| } |
| |
| if (header.GetHopLimit() == 0) |
| { |
| // send time exceeded |
| ExitNow(error = OT_ERROR_DROP); |
| } |
| else |
| { |
| hopLimit = header.GetHopLimit(); |
| aMessage.Write(Header::GetHopLimitOffset(), Header::GetHopLimitSize(), &hopLimit); |
| |
| // submit aMessage to interface |
| SuccessOrExit(error = Get<ThreadNetif>().SendMessage(aMessage)); |
| } |
| } |
| |
| exit: |
| |
| if (!tunnel && (error != OT_ERROR_NONE || !forward)) |
| { |
| aMessage.Free(); |
| } |
| |
| return error; |
| } |
| |
| bool Ip6::ShouldForwardToThread(const MessageInfo &aMessageInfo) const |
| { |
| bool rval = false; |
| |
| if (aMessageInfo.GetSockAddr().IsMulticast()) |
| { |
| // multicast |
| ExitNow(rval = true); |
| } |
| else if (aMessageInfo.GetSockAddr().IsLinkLocal()) |
| { |
| // on-link link-local address |
| ExitNow(rval = true); |
| } |
| else if (IsOnLink(aMessageInfo.GetSockAddr())) |
| { |
| // on-link global address |
| ExitNow(rval = true); |
| } |
| else if (Get<ThreadNetif>().RouteLookup(aMessageInfo.GetPeerAddr(), aMessageInfo.GetSockAddr(), NULL) == |
| OT_ERROR_NONE) |
| { |
| // route |
| ExitNow(rval = true); |
| } |
| else |
| { |
| ExitNow(rval = false); |
| } |
| |
| exit: |
| return rval; |
| } |
| |
| const NetifUnicastAddress *Ip6::SelectSourceAddress(MessageInfo &aMessageInfo) |
| { |
| Address * destination = &aMessageInfo.GetPeerAddr(); |
| uint8_t destinationScope = destination->GetScope(); |
| const NetifUnicastAddress *rvalAddr = NULL; |
| uint8_t rvalPrefixMatched = 0; |
| |
| for (const NetifUnicastAddress *addr = Get<ThreadNetif>().GetUnicastAddresses(); addr; addr = addr->GetNext()) |
| { |
| const Address *candidateAddr = &addr->GetAddress(); |
| uint8_t candidatePrefixMatched; |
| uint8_t overrideScope; |
| |
| if (candidateAddr->IsAnycastRoutingLocator()) |
| { |
| // Don't use anycast address as source address. |
| continue; |
| } |
| |
| candidatePrefixMatched = destination->PrefixMatch(*candidateAddr); |
| |
| if (candidatePrefixMatched >= addr->mPrefixLength) |
| { |
| candidatePrefixMatched = addr->mPrefixLength; |
| overrideScope = addr->GetScope(); |
| } |
| else |
| { |
| overrideScope = destinationScope; |
| } |
| |
| if (rvalAddr == NULL) |
| { |
| // Rule 0: Prefer any address |
| rvalAddr = addr; |
| rvalPrefixMatched = candidatePrefixMatched; |
| } |
| else if (*candidateAddr == *destination) |
| { |
| // Rule 1: Prefer same address |
| rvalAddr = addr; |
| ExitNow(); |
| } |
| else if (addr->GetScope() < rvalAddr->GetScope()) |
| { |
| // Rule 2: Prefer appropriate scope |
| if (addr->GetScope() >= overrideScope) |
| { |
| rvalAddr = addr; |
| rvalPrefixMatched = candidatePrefixMatched; |
| } |
| else |
| { |
| continue; |
| } |
| } |
| else if (addr->GetScope() > rvalAddr->GetScope()) |
| { |
| if (rvalAddr->GetScope() < overrideScope) |
| { |
| rvalAddr = addr; |
| rvalPrefixMatched = candidatePrefixMatched; |
| } |
| else |
| { |
| continue; |
| } |
| } |
| else if (addr->mPreferred && !rvalAddr->mPreferred) |
| { |
| // Rule 3: Avoid deprecated addresses |
| rvalAddr = addr; |
| rvalPrefixMatched = candidatePrefixMatched; |
| } |
| else if (candidatePrefixMatched > rvalPrefixMatched) |
| { |
| // Rule 6: Prefer matching label |
| // Rule 7: Prefer public address |
| // Rule 8: Use longest prefix matching |
| rvalAddr = addr; |
| rvalPrefixMatched = candidatePrefixMatched; |
| } |
| else if ((candidatePrefixMatched == rvalPrefixMatched) && |
| (destination->IsRoutingLocator() == candidateAddr->IsRoutingLocator())) |
| { |
| // Additional rule: Prefer RLOC source for RLOC destination, EID source for anything else |
| rvalAddr = addr; |
| rvalPrefixMatched = candidatePrefixMatched; |
| } |
| else |
| { |
| continue; |
| } |
| |
| // infer destination scope based on prefix match |
| if (rvalPrefixMatched >= rvalAddr->mPrefixLength) |
| { |
| destinationScope = rvalAddr->GetScope(); |
| } |
| } |
| |
| exit: |
| return rvalAddr; |
| } |
| |
| bool Ip6::IsOnLink(const Address &aAddress) const |
| { |
| bool rval = false; |
| |
| for (const NetifUnicastAddress *cur = Get<ThreadNetif>().GetUnicastAddresses(); cur; cur = cur->GetNext()) |
| { |
| if (cur->GetAddress().PrefixMatch(aAddress) >= cur->mPrefixLength) |
| { |
| ExitNow(rval = true); |
| } |
| } |
| |
| exit: |
| return rval; |
| } |
| |
| // LCOV_EXCL_START |
| |
| const char *Ip6::IpProtoToString(uint8_t aIpProto) |
| { |
| const char *retval; |
| |
| switch (aIpProto) |
| { |
| case kProtoHopOpts: |
| retval = "HopOpts"; |
| break; |
| |
| case kProtoTcp: |
| retval = "TCP"; |
| break; |
| |
| case kProtoUdp: |
| retval = "UDP"; |
| break; |
| |
| case kProtoIp6: |
| retval = "IP6"; |
| break; |
| |
| case kProtoRouting: |
| retval = "Routing"; |
| break; |
| |
| case kProtoFragment: |
| retval = "Frag"; |
| break; |
| |
| case kProtoIcmp6: |
| retval = "ICMP6"; |
| break; |
| |
| case kProtoNone: |
| retval = "None"; |
| break; |
| |
| case kProtoDstOpts: |
| retval = "DstOpts"; |
| break; |
| |
| default: |
| retval = "Unknown"; |
| break; |
| } |
| |
| return retval; |
| } |
| |
| // LCOV_EXCL_STOP |
| |
| } // namespace Ip6 |
| } // namespace ot |
