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components/openthread/openthread/src/core/net/ip6_address.cpp
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/*
* 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 addresses.
*/
#include "ip6_address.hpp"
#include "instance/instance.hpp"
namespace ot {
namespace Ip6 {
//---------------------------------------------------------------------------------------------------------------------
// NetworkPrefix methods
Error NetworkPrefix::GenerateRandomUla(void)
{
m8[0] = 0xfd;
return Random::Crypto::FillBuffer(&m8[1], kSize - 1);
}
//---------------------------------------------------------------------------------------------------------------------
// Prefix methods
void Prefix::Set(const uint8_t *aPrefix, uint8_t aLength)
{
memcpy(mPrefix.mFields.m8, aPrefix, SizeForLength(aLength));
mLength = aLength;
}
bool Prefix::IsLinkLocal(void) const
{
return (mLength >= 10) &&
((mPrefix.mFields.m16[0] & BigEndian::HostSwap16(0xffc0)) == BigEndian::HostSwap16(0xfe80));
}
bool Prefix::IsMulticast(void) const { return (mLength >= 8) && (mPrefix.mFields.m8[0] == 0xff); }
bool Prefix::IsUniqueLocal(void) const { return (mLength >= 7) && ((mPrefix.mFields.m8[0] & 0xfe) == 0xfc); }
bool Prefix::IsEqual(const uint8_t *aPrefixBytes, uint8_t aPrefixLength) const
{
return (mLength == aPrefixLength) && (MatchLength(GetBytes(), aPrefixBytes, GetBytesSize()) >= mLength);
}
bool Prefix::ContainsPrefix(const Prefix &aSubPrefix) const
{
return (mLength >= aSubPrefix.mLength) &&
(MatchLength(GetBytes(), aSubPrefix.GetBytes(), aSubPrefix.GetBytesSize()) >= aSubPrefix.GetLength());
}
bool Prefix::ContainsPrefix(const NetworkPrefix &aSubPrefix) const
{
return (mLength >= NetworkPrefix::kLength) &&
(MatchLength(GetBytes(), aSubPrefix.m8, NetworkPrefix::kSize) >= NetworkPrefix::kLength);
}
void Prefix::Tidy(void)
{
uint8_t byteLength = GetBytesSize();
uint8_t lastByteBitMask = ~(static_cast<uint8_t>(1 << (byteLength * 8 - mLength)) - 1);
if (byteLength != 0)
{
mPrefix.mFields.m8[byteLength - 1] &= lastByteBitMask;
}
for (uint16_t i = byteLength; i < GetArrayLength(mPrefix.mFields.m8); i++)
{
mPrefix.mFields.m8[i] = 0;
}
}
bool Prefix::operator==(const Prefix &aOther) const
{
return (mLength == aOther.mLength) && (MatchLength(GetBytes(), aOther.GetBytes(), GetBytesSize()) >= GetLength());
}
bool Prefix::operator<(const Prefix &aOther) const
{
bool isSmaller;
uint8_t minLength;
uint8_t matchedLength;
minLength = Min(GetLength(), aOther.GetLength());
matchedLength = MatchLength(GetBytes(), aOther.GetBytes(), SizeForLength(minLength));
if (matchedLength >= minLength)
{
isSmaller = (GetLength() < aOther.GetLength());
ExitNow();
}
isSmaller = GetBytes()[matchedLength / kBitsPerByte] < aOther.GetBytes()[matchedLength / kBitsPerByte];
exit:
return isSmaller;
}
uint8_t Prefix::MatchLength(const uint8_t *aPrefixA, const uint8_t *aPrefixB, uint8_t aMaxSize)
{
uint8_t matchedLength = 0;
OT_ASSERT(aMaxSize <= Address::kSize);
for (uint8_t i = 0; i < aMaxSize; i++)
{
uint8_t diff = aPrefixA[i] ^ aPrefixB[i];
if (diff == 0)
{
matchedLength += kBitsPerByte;
}
else
{
while ((diff & 0x80) == 0)
{
matchedLength++;
diff <<= 1;
}
break;
}
}
return matchedLength;
}
bool Prefix::IsValidNat64PrefixLength(uint8_t aLength)
{
return (aLength == 32) || (aLength == 40) || (aLength == 48) || (aLength == 56) || (aLength == 64) ||
(aLength == 96);
}
Error Prefix::FromString(const char *aString)
{
constexpr char kSlashChar = '/';
constexpr char kNullChar = '\0';
Error error = kErrorParse;
const char *cur;
VerifyOrExit(aString != nullptr);
cur = StringFind(aString, kSlashChar);
VerifyOrExit(cur != nullptr);
SuccessOrExit(AsCoreType(&mPrefix).ParseFrom(aString, kSlashChar));
cur++;
SuccessOrExit(StringParseUint8(cur, mLength, kMaxLength));
VerifyOrExit(*cur == kNullChar);
error = kErrorNone;
exit:
return error;
}
Prefix::InfoString Prefix::ToString(void) const
{
InfoString string;
ToString(string);
return string;
}
void Prefix::ToString(char *aBuffer, uint16_t aSize) const
{
StringWriter writer(aBuffer, aSize);
ToString(writer);
}
void Prefix::ToString(StringWriter &aWriter) const
{
uint8_t sizeInUint16 = (GetBytesSize() + sizeof(uint16_t) - 1) / sizeof(uint16_t);
Prefix tidyPrefix = *this;
tidyPrefix.Tidy();
AsCoreType(&tidyPrefix.mPrefix).AppendHexWords(aWriter, sizeInUint16);
if (GetBytesSize() < Address::kSize - 1)
{
aWriter.Append("::");
}
aWriter.Append("/%d", mLength);
}
//---------------------------------------------------------------------------------------------------------------------
// InterfaceIdentifier methods
bool InterfaceIdentifier::IsUnspecified(void) const { return (mFields.m32[0] == 0) && (mFields.m32[1] == 0); }
bool InterfaceIdentifier::IsReserved(void) const
{
return IsSubnetRouterAnycast() || IsReservedSubnetAnycast() || IsAnycastLocator();
}
bool InterfaceIdentifier::IsSubnetRouterAnycast(void) const { return (mFields.m32[0] == 0) && (mFields.m32[1] == 0); }
bool InterfaceIdentifier::IsReservedSubnetAnycast(void) const
{
// Format of IID in a Reserved Subnet Anycast Address (RFC 2526)
//
// | 57 bits | 7 bits |
// +------------------+------------+
// | 1111110111...111 | anycast ID |
// +------------------+------------+
return (mFields.m32[0] == BigEndian::HostSwap32(0xfdffffff) && mFields.m16[2] == BigEndian::HostSwap16(0xffff) &&
mFields.m8[6] == 0xff && mFields.m8[7] >= 0x80);
}
void InterfaceIdentifier::GenerateRandom(void) { SuccessOrAssert(Random::Crypto::Fill(*this)); }
void InterfaceIdentifier::SetBytes(const uint8_t *aBuffer) { memcpy(mFields.m8, aBuffer, kSize); }
void InterfaceIdentifier::SetFromExtAddress(const Mac::ExtAddress &aExtAddress)
{
Mac::ExtAddress addr;
addr = aExtAddress;
addr.ToggleLocal();
addr.CopyTo(mFields.m8);
}
void InterfaceIdentifier::ConvertToExtAddress(Mac::ExtAddress &aExtAddress) const
{
aExtAddress.Set(mFields.m8);
aExtAddress.ToggleLocal();
}
void InterfaceIdentifier::ConvertToMacAddress(Mac::Address &aMacAddress) const
{
aMacAddress.SetExtended(mFields.m8);
aMacAddress.GetExtended().ToggleLocal();
}
void InterfaceIdentifier::SetToLocator(uint16_t aLocator)
{
// Locator IID pattern `0000:00ff:fe00:xxxx`
mFields.m32[0] = BigEndian::HostSwap32(0x000000ff);
mFields.m16[2] = BigEndian::HostSwap16(0xfe00);
mFields.m16[3] = BigEndian::HostSwap16(aLocator);
}
bool InterfaceIdentifier::IsLocator(void) const
{
// Locator IID pattern 0000:00ff:fe00:xxxx
return (mFields.m32[0] == BigEndian::HostSwap32(0x000000ff) && mFields.m16[2] == BigEndian::HostSwap16(0xfe00));
}
bool InterfaceIdentifier::IsRoutingLocator(void) const
{
return (IsLocator() && (mFields.m8[6] < kAloc16Mask) && ((mFields.m8[6] & kRloc16ReservedBitMask) == 0));
}
bool InterfaceIdentifier::IsAnycastLocator(void) const
{
// Anycast locator range 0xfc00- 0xfcff (`kAloc16Mask` is 0xfc)
return (IsLocator() && (mFields.m8[6] == kAloc16Mask));
}
bool InterfaceIdentifier::IsAnycastServiceLocator(void) const
{
uint16_t locator = GetLocator();
return (IsLocator() && (locator >= Mle::kAloc16ServiceStart) && (locator <= Mle::kAloc16ServiceEnd));
}
void InterfaceIdentifier::ApplyPrefix(const Prefix &aPrefix)
{
if (aPrefix.GetLength() > NetworkPrefix::kLength)
{
Address::CopyBits(mFields.m8, aPrefix.GetBytes() + NetworkPrefix::kSize,
aPrefix.GetLength() - NetworkPrefix::kLength);
}
}
InterfaceIdentifier::InfoString InterfaceIdentifier::ToString(void) const
{
InfoString string;
string.AppendHexBytes(mFields.m8, kSize);
return string;
}
//---------------------------------------------------------------------------------------------------------------------
// Address methods
bool Address::IsUnspecified(void) const
{
return (mFields.m32[0] == 0 && mFields.m32[1] == 0 && mFields.m32[2] == 0 && mFields.m32[3] == 0);
}
bool Address::IsLoopback(void) const
{
return (mFields.m32[0] == 0 && mFields.m32[1] == 0 && mFields.m32[2] == 0 &&
mFields.m32[3] == BigEndian::HostSwap32(1));
}
bool Address::IsLinkLocalUnicast(void) const
{
return (mFields.m16[0] & BigEndian::HostSwap16(0xffc0)) == BigEndian::HostSwap16(0xfe80);
}
void Address::SetToLinkLocalAddress(const Mac::ExtAddress &aExtAddress)
{
mFields.m32[0] = BigEndian::HostSwap32(0xfe800000);
mFields.m32[1] = 0;
GetIid().SetFromExtAddress(aExtAddress);
}
void Address::SetToLinkLocalAddress(const InterfaceIdentifier &aIid)
{
mFields.m32[0] = BigEndian::HostSwap32(0xfe800000);
mFields.m32[1] = 0;
SetIid(aIid);
}
bool Address::IsLinkLocalMulticast(void) const { return IsMulticast() && (GetScope() == kLinkLocalScope); }
bool Address::IsLinkLocalUnicastOrMulticast(void) const { return IsLinkLocalUnicast() || IsLinkLocalMulticast(); }
bool Address::IsLinkLocalAllNodesMulticast(void) const { return (*this == GetLinkLocalAllNodesMulticast()); }
void Address::SetToLinkLocalAllNodesMulticast(void) { *this = GetLinkLocalAllNodesMulticast(); }
bool Address::IsLinkLocalAllRoutersMulticast(void) const { return (*this == GetLinkLocalAllRoutersMulticast()); }
void Address::SetToLinkLocalAllRoutersMulticast(void) { *this = GetLinkLocalAllRoutersMulticast(); }
bool Address::IsRealmLocalMulticast(void) const { return IsMulticast() && (GetScope() == kRealmLocalScope); }
bool Address::IsMulticastLargerThanRealmLocal(void) const { return IsMulticast() && (GetScope() > kRealmLocalScope); }
bool Address::IsRealmLocalAllNodesMulticast(void) const { return (*this == GetRealmLocalAllNodesMulticast()); }
void Address::SetToRealmLocalAllNodesMulticast(void) { *this = GetRealmLocalAllNodesMulticast(); }
bool Address::IsRealmLocalAllRoutersMulticast(void) const { return (*this == GetRealmLocalAllRoutersMulticast()); }
void Address::SetToRealmLocalAllRoutersMulticast(void) { *this = GetRealmLocalAllRoutersMulticast(); }
bool Address::IsRealmLocalAllMplForwarders(void) const { return (*this == GetRealmLocalAllMplForwarders()); }
void Address::SetToRealmLocalAllMplForwarders(void) { *this = GetRealmLocalAllMplForwarders(); }
bool Address::IsIp4Mapped(void) const
{
return (mFields.m32[0] == 0) && (mFields.m32[1] == 0) && (mFields.m32[2] == BigEndian::HostSwap32(0xffff));
}
void Address::SetToIp4Mapped(const Ip4::Address &aIp4Address)
{
Clear();
mFields.m16[5] = 0xffff;
memcpy(&mFields.m8[12], aIp4Address.GetBytes(), sizeof(Ip4::Address));
}
bool Address::MatchesPrefix(const Prefix &aPrefix) const
{
return Prefix::MatchLength(mFields.m8, aPrefix.GetBytes(), aPrefix.GetBytesSize()) >= aPrefix.GetLength();
}
bool Address::MatchesPrefix(const uint8_t *aPrefix, uint8_t aPrefixLength) const
{
return Prefix::MatchLength(mFields.m8, aPrefix, Prefix::SizeForLength(aPrefixLength)) >= aPrefixLength;
}
void Address::SetPrefix(const NetworkPrefix &aNetworkPrefix) { mFields.mComponents.mNetworkPrefix = aNetworkPrefix; }
void Address::SetPrefix(const Prefix &aPrefix) { CopyBits(mFields.m8, aPrefix.GetBytes(), aPrefix.GetLength()); }
void Address::CopyBits(uint8_t *aDst, const uint8_t *aSrc, uint8_t aNumBits)
{
// This method copies `aNumBits` from `aSrc` into `aDst` handling
// the case where `aNumBits` may not be a multiple of 8. It leaves the
// remaining bits beyond `aNumBits` in `aDst` unchanged.
uint8_t numBytes = aNumBits / kBitsPerByte;
uint8_t extraBits = aNumBits % kBitsPerByte;
memcpy(aDst, aSrc, numBytes);
if (extraBits > 0)
{
uint8_t mask = ((0x80 >> (extraBits - 1)) - 1);
// `mask` has its higher (msb) `extraBits` bits as `0` and the remaining as `1`.
// Example with `extraBits` = 3:
// ((0x80 >> 2) - 1) = (0b0010_0000 - 1) = 0b0001_1111
aDst[numBytes] &= mask;
aDst[numBytes] |= (aSrc[numBytes] & ~mask);
}
}
void Address::SetMulticastNetworkPrefix(const uint8_t *aPrefix, uint8_t aPrefixLength)
{
CopyBits(&mFields.m8[kMulticastNetworkPrefixOffset], aPrefix, aPrefixLength);
mFields.m8[kMulticastNetworkPrefixLengthOffset] = aPrefixLength;
}
void Address::SetToLocator(const NetworkPrefix &aNetworkPrefix, uint16_t aLocator)
{
SetPrefix(aNetworkPrefix);
GetIid().SetToLocator(aLocator);
}
uint8_t Address::GetScope(void) const
{
uint8_t rval;
if (IsMulticast())
{
rval = mFields.m8[1] & 0xf;
}
else if (IsLinkLocalUnicast())
{
rval = kLinkLocalScope;
}
else if (IsLoopback())
{
rval = kNodeLocalScope;
}
else
{
rval = kGlobalScope;
}
return rval;
}
uint8_t Address::PrefixMatch(const Address &aOther) const
{
return Prefix::MatchLength(mFields.m8, aOther.mFields.m8, sizeof(Address));
}
bool Address::MatchesFilter(TypeFilter aFilter) const
{
bool matches = true;
switch (aFilter)
{
case kTypeAny:
break;
case kTypeUnicast:
matches = !IsUnspecified() && !IsMulticast();
break;
case kTypeMulticast:
matches = IsMulticast();
break;
case kTypeMulticastLargerThanRealmLocal:
matches = IsMulticastLargerThanRealmLocal();
break;
}
return matches;
}
void Address::SynthesizeFromIp4Address(const Prefix &aPrefix, const Ip4::Address &aIp4Address)
{
// The prefix length must be 32, 40, 48, 56, 64, 96. IPv4 bytes are added
// after the prefix, skipping over the bits 64 to 71 (byte at `kSkipIndex`)
// which must be set to zero. The suffix is set to zero (per RFC 6052).
//
// +--+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
// |PL| 0-------------32--40--48--56--64--72--80--88--96--104---------|
// +--+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
// |32| prefix |v4(32) | u | suffix |
// +--+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
// |40| prefix |v4(24) | u |(8)| suffix |
// +--+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
// |48| prefix |v4(16) | u | (16) | suffix |
// +--+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
// |56| prefix |(8)| u | v4(24) | suffix |
// +--+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
// |64| prefix | u | v4(32) | suffix |
// +--+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
// |96| prefix | v4(32) |
// +--+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
constexpr uint8_t kSkipIndex = 8;
uint8_t ip6Index;
OT_ASSERT(aPrefix.IsValidNat64());
Clear();
SetPrefix(aPrefix);
ip6Index = aPrefix.GetLength() / kBitsPerByte;
for (uint8_t i = 0; i < Ip4::Address::kSize; i++)
{
if (ip6Index == kSkipIndex)
{
ip6Index++;
}
mFields.m8[ip6Index++] = aIp4Address.GetBytes()[i];
}
}
Error Address::FromString(const char *aString)
{
constexpr char kNullChar = '\0';
return ParseFrom(aString, kNullChar);
}
Error Address::ParseFrom(const char *aString, char aTerminatorChar)
{
constexpr uint8_t kInvalidIndex = 0xff;
constexpr char kColonChar = ':';
constexpr char kDotChar = '.';
Error error = kErrorParse;
uint8_t index = 0;
uint8_t endIndex = kSize / sizeof(uint16_t);
uint8_t colonIndex = kInvalidIndex;
bool hasIp4 = false;
// Check if the string starts with "::".
if (*aString == kColonChar)
{
aString++;
VerifyOrExit(*aString == kColonChar);
aString++;
colonIndex = index;
}
while (*aString != aTerminatorChar)
{
const char *start = aString;
uint32_t value = 0;
// Parse hex number
while (true)
{
uint8_t digit;
if (ParseHexDigit(*aString, digit) != kErrorNone)
{
break;
}
aString++;
value = (value << 4) + digit;
VerifyOrExit(value <= NumericLimits<uint16_t>::kMax);
}
VerifyOrExit(aString != start);
if (*aString == kDotChar)
{
// IPv6 address contains an embedded IPv4 address.
aString = start;
hasIp4 = true;
endIndex -= Ip4::Address::kSize / sizeof(uint16_t);
VerifyOrExit(index <= endIndex);
break;
}
VerifyOrExit((*aString == kColonChar) || (*aString == aTerminatorChar));
VerifyOrExit(index < endIndex);
mFields.m16[index++] = BigEndian::HostSwap16(static_cast<uint16_t>(value));
if (*aString == kColonChar)
{
aString++;
if (*aString == kColonChar)
{
VerifyOrExit(colonIndex == kInvalidIndex);
colonIndex = index;
aString++;
}
}
}
if (index < endIndex)
{
uint8_t wordsToCopy;
VerifyOrExit(colonIndex != kInvalidIndex);
wordsToCopy = index - colonIndex;
memmove(&mFields.m16[endIndex - wordsToCopy], &mFields.m16[colonIndex], wordsToCopy * sizeof(uint16_t));
memset(&mFields.m16[colonIndex], 0, (endIndex - index) * sizeof(uint16_t));
}
if (hasIp4)
{
Ip4::Address ip4Addr;
SuccessOrExit(error = ip4Addr.FromString(aString, aTerminatorChar));
memcpy(GetArrayEnd(mFields.m8) - Ip4::Address::kSize, ip4Addr.GetBytes(), Ip4::Address::kSize);
}
error = kErrorNone;
exit:
return error;
}
Address::InfoString Address::ToString(void) const
{
InfoString string;
ToString(string);
return string;
}
void Address::ToString(char *aBuffer, uint16_t aSize) const
{
StringWriter writer(aBuffer, aSize);
ToString(writer);
}
void Address::ToString(StringWriter &aWriter) const
{
AppendHexWords(aWriter, static_cast<uint8_t>(GetArrayLength(mFields.m16)));
}
void Address::AppendHexWords(StringWriter &aWriter, uint8_t aLength) const
{
// Appends the first `aLength` elements in `mFields.m16[]` array
// as hex words.
for (uint8_t index = 0; index < aLength; index++)
{
if (index > 0)
{
aWriter.Append(":");
}
aWriter.Append("%x", BigEndian::HostSwap16(mFields.m16[index]));
}
}
const Address &Address::GetLinkLocalAllNodesMulticast(void)
{
return AsCoreType(&Netif::kLinkLocalAllNodesMulticastAddress.mAddress);
}
const Address &Address::GetLinkLocalAllRoutersMulticast(void)
{
return AsCoreType(&Netif::kLinkLocalAllRoutersMulticastAddress.mAddress);
}
const Address &Address::GetRealmLocalAllNodesMulticast(void)
{
return AsCoreType(&Netif::kRealmLocalAllNodesMulticastAddress.mAddress);
}
const Address &Address::GetRealmLocalAllRoutersMulticast(void)
{
return AsCoreType(&Netif::kRealmLocalAllRoutersMulticastAddress.mAddress);
}
const Address &Address::GetRealmLocalAllMplForwarders(void)
{
return AsCoreType(&Netif::kRealmLocalAllMplForwardersMulticastAddress.mAddress);
}
} // namespace Ip6
} // namespace ot
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