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[ip6] add ApplyPrefix() to Ip6::InterfaceIdentifier (#7973)

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This commit adds a new method `InterfaceIdentifier::ApplyPrefix()`
which applies a given prefix to an IID. This is applicable only when
the prefix length is longer than 64 bit. In this case, only the bits
in the IID up the prefix length are changed to match the prefix and
the remaining bits are left unchanged. This commit also updates the
unit test to validate the behavior of the new method.
This commit is contained in:
Abtin Keshavarzian
2022-08-04 20:19:56 -07:00
committed by Jonathan Hui
parent 3b0738542c
commit 21c5bf7025
3 changed files with 78 additions and 17 deletions
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tests/unit/test_ip_address.cpp
+39 -2
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@@ -215,6 +215,27 @@ bool CheckPrefix(const ot::Ip6::Address &aAddress, const uint8_t *aPrefix, uint8
return matches;
}
bool CheckPrefixInIid(const ot::Ip6::InterfaceIdentifier &aIid, const uint8_t *aPrefix, uint8_t aPrefixLength)
{
// Check the IID to contain the prefix bits (applicable when prefix length is longer than 64).
bool matches = true;
for (uint8_t bit = 64; bit < aPrefixLength; bit++)
{
uint8_t index = bit / CHAR_BIT;
uint8_t mask = (0x80 >> (bit % CHAR_BIT));
if ((aIid.mFields.m8[index - 8] & mask) != (aPrefix[index] & mask))
{
matches = false;
break;
}
}
return matches;
}
bool CheckInterfaceId(const ot::Ip6::Address &aAddress1, const ot::Ip6::Address &aAddress2, uint8_t aPrefixLength)
{
// Check whether all the bits after aPrefixLength of the two given IPv6 Address match or not.
@@ -248,6 +269,7 @@ void TestIp6AddressSetPrefix(void)
ot::Ip6::Address address;
ot::Ip6::Address allZeroAddress;
ot::Ip6::Address allOneAddress;
ot::Ip6::Prefix ip6Prefix;
allZeroAddress.Clear();
memset(&allOneAddress, 0xff, sizeof(allOneAddress));
@@ -259,18 +281,33 @@ void TestIp6AddressSetPrefix(void)
for (uint8_t prefixLength = 0; prefixLength <= sizeof(ot::Ip6::Address) * CHAR_BIT; prefixLength++)
{
ip6Prefix.Clear();
ip6Prefix.Set(prefix, prefixLength);
address = allZeroAddress;
address.SetPrefix(prefix, prefixLength);
address.SetPrefix(ip6Prefix);
printf(" prefix-len:%-3d --> %s\n", prefixLength, address.ToString().AsCString());
VerifyOrQuit(CheckPrefix(address, prefix, prefixLength), "Prefix does not match after SetPrefix()");
VerifyOrQuit(CheckInterfaceId(address, allZeroAddress, prefixLength),
"SetPrefix changed bits beyond the prefix length");
address = allOneAddress;
address.SetPrefix(prefix, prefixLength);
address.SetPrefix(ip6Prefix);
VerifyOrQuit(CheckPrefix(address, prefix, prefixLength), "Prefix does not match after SetPrefix()");
VerifyOrQuit(CheckInterfaceId(address, allOneAddress, prefixLength),
"SetPrefix changed bits beyond the prefix length");
address = allZeroAddress;
address.GetIid().ApplyPrefix(ip6Prefix);
VerifyOrQuit(CheckPrefixInIid(address.GetIid(), prefix, prefixLength), "IID is not correct");
VerifyOrQuit(CheckInterfaceId(address, allZeroAddress, prefixLength),
"Iid:ApplyPrefrix() changed bits beyond the prefix length");
address = allOneAddress;
address.GetIid().ApplyPrefix(ip6Prefix);
VerifyOrQuit(CheckPrefixInIid(address.GetIid(), prefix, prefixLength), "IID is not correct");
VerifyOrQuit(CheckInterfaceId(address, allOneAddress, prefixLength),
"Iid:ApplyPrefrix() changed bits beyond the prefix length");
}
}
}