| /* |
| * 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 the Thread IPv6 global addresses configuration utilities. |
| */ |
| |
| #include <openthread/config.h> |
| |
| #include "slaac_address.hpp" |
| |
| #include "utils/wrap_string.h" |
| |
| #include <openthread/openthread.h> |
| |
| #include "common/code_utils.hpp" |
| #include "common/debug.hpp" |
| #include "crypto/sha256.hpp" |
| #include "mac/mac.hpp" |
| #include "net/ip6_address.hpp" |
| |
| namespace ot { |
| namespace Utils { |
| |
| void Slaac::UpdateAddresses(otInstance *aInstance, otNetifAddress *aAddresses, uint32_t aNumAddresses, |
| IidCreator aIidCreator, void *aContext) |
| { |
| otNetworkDataIterator iterator; |
| otBorderRouterConfig config; |
| |
| // remove addresses |
| for (size_t i = 0; i < aNumAddresses; i++) |
| { |
| otNetifAddress *address = &aAddresses[i]; |
| bool found = false; |
| |
| if (!address->mValid) |
| { |
| continue; |
| } |
| |
| iterator = OT_NETWORK_DATA_ITERATOR_INIT; |
| |
| while (otNetDataGetNextOnMeshPrefix(aInstance, &iterator, &config) == OT_ERROR_NONE) |
| { |
| if (config.mSlaac == false) |
| { |
| continue; |
| } |
| |
| if (otIp6PrefixMatch(&config.mPrefix.mPrefix, &address->mAddress) >= config.mPrefix.mLength && |
| config.mPrefix.mLength == address->mPrefixLength) |
| { |
| found = true; |
| break; |
| } |
| } |
| |
| if (!found) |
| { |
| otIp6RemoveUnicastAddress(aInstance, &address->mAddress); |
| address->mValid = false; |
| } |
| } |
| |
| // add addresses |
| iterator = OT_NETWORK_DATA_ITERATOR_INIT; |
| |
| while (otNetDataGetNextOnMeshPrefix(aInstance, &iterator, &config) == OT_ERROR_NONE) |
| { |
| bool found = false; |
| |
| if (config.mSlaac == false) |
| { |
| continue; |
| } |
| |
| for (size_t i = 0; i < aNumAddresses; i++) |
| { |
| otNetifAddress *address = &aAddresses[i]; |
| |
| if (!address->mValid) |
| { |
| continue; |
| } |
| |
| if (otIp6PrefixMatch(&config.mPrefix.mPrefix, &address->mAddress) >= config.mPrefix.mLength && |
| config.mPrefix.mLength == address->mPrefixLength) |
| { |
| found = true; |
| break; |
| } |
| } |
| |
| if (!found) |
| { |
| for (size_t i = 0; i < aNumAddresses; i++) |
| { |
| otNetifAddress *address = &aAddresses[i]; |
| |
| if (address->mValid) |
| { |
| continue; |
| } |
| |
| memset(address, 0, sizeof(*address)); |
| memcpy(&address->mAddress, &config.mPrefix.mPrefix, 8); |
| |
| address->mPrefixLength = config.mPrefix.mLength; |
| address->mPreferred = config.mPreferred; |
| address->mValid = true; |
| |
| if (aIidCreator(aInstance, address, aContext) != OT_ERROR_NONE) |
| { |
| CreateRandomIid(aInstance, address, aContext); |
| } |
| |
| otIp6AddUnicastAddress(aInstance, address); |
| break; |
| } |
| } |
| } |
| } |
| |
| otError Slaac::CreateRandomIid(otInstance *, otNetifAddress *aAddress, void *) |
| { |
| for (size_t i = sizeof(aAddress[i].mAddress) - OT_IP6_IID_SIZE; i < sizeof(aAddress[i].mAddress); i++) |
| { |
| aAddress->mAddress.mFields.m8[i] = static_cast<uint8_t>(otPlatRandomGet()); |
| } |
| |
| return OT_ERROR_NONE; |
| } |
| |
| otError SemanticallyOpaqueIidGenerator::CreateIid(otInstance *aInstance, otNetifAddress *aAddress) |
| { |
| otError error = OT_ERROR_NONE; |
| |
| for (uint32_t i = 0; i <= kMaxRetries; i++) |
| { |
| error = CreateIidOnce(aInstance, aAddress); |
| VerifyOrExit(error == OT_ERROR_IP6_ADDRESS_CREATION_FAILURE); |
| |
| mDadCounter++; |
| } |
| |
| exit: |
| return error; |
| } |
| |
| otError SemanticallyOpaqueIidGenerator::CreateIidOnce(otInstance *aInstance, otNetifAddress *aAddress) |
| { |
| otError error = OT_ERROR_NONE; |
| Crypto::Sha256 sha256; |
| uint8_t hash[Crypto::Sha256::kHashSize]; |
| Ip6::Address *address = static_cast<Ip6::Address *>(&aAddress->mAddress); |
| |
| sha256.Start(); |
| |
| sha256.Update(aAddress->mAddress.mFields.m8, aAddress->mPrefixLength / 8); |
| |
| VerifyOrExit(mInterfaceId != NULL, error = OT_ERROR_INVALID_ARGS); |
| sha256.Update(mInterfaceId, mInterfaceIdLength); |
| |
| if (mNetworkIdLength) |
| { |
| VerifyOrExit(mNetworkId != NULL, error = OT_ERROR_INVALID_ARGS); |
| sha256.Update(mNetworkId, mNetworkIdLength); |
| } |
| |
| sha256.Update(static_cast<uint8_t *>(&mDadCounter), sizeof(mDadCounter)); |
| |
| VerifyOrExit(mSecretKey != NULL, error = OT_ERROR_INVALID_ARGS); |
| sha256.Update(mSecretKey, mSecretKeyLength); |
| |
| sha256.Finish(hash); |
| |
| memcpy(&aAddress->mAddress.mFields.m8[OT_IP6_ADDRESS_SIZE - OT_IP6_IID_SIZE], |
| &hash[sizeof(hash) - OT_IP6_IID_SIZE], OT_IP6_IID_SIZE); |
| |
| VerifyOrExit(!IsAddressRegistered(aInstance, aAddress), error = OT_ERROR_IP6_ADDRESS_CREATION_FAILURE); |
| VerifyOrExit(!address->IsIidReserved(), error = OT_ERROR_IP6_ADDRESS_CREATION_FAILURE); |
| |
| exit: |
| return error; |
| } |
| |
| bool SemanticallyOpaqueIidGenerator::IsAddressRegistered(otInstance *aInstance, otNetifAddress *aCreatedAddress) |
| { |
| bool result = false; |
| const otNetifAddress *address = otIp6GetUnicastAddresses(aInstance); |
| |
| while (address != NULL) |
| { |
| if (0 == memcmp(aCreatedAddress->mAddress.mFields.m8, address->mAddress.mFields.m8, |
| sizeof(address->mAddress.mFields))) |
| { |
| ExitNow(result = true); |
| } |
| |
| address = address->mNext; |
| } |
| |
| exit: |
| return result; |
| } |
| |
| |
| } // namespace Slaac |
| } // namespace ot |