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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ip_util.h"
BSSL_NAMESPACE_BEGIN
bool IsValidNetmask(der::Input mask) {
if (mask.size() != kIPv4AddressSize && mask.size() != kIPv6AddressSize) {
return false;
}
for (size_t i = 0; i < mask.size(); i++) {
uint8_t b = mask[i];
if (b != 0xff) {
// b must be all ones followed by all zeros, so ~b must be all zeros
// followed by all ones.
uint8_t inv = ~b;
if ((inv & (inv + 1)) != 0) {
return false;
}
// The remaining bytes must be all zeros.
for (size_t j = i + 1; j < mask.size(); j++) {
if (mask[j] != 0) {
return false;
}
}
return true;
}
}
return true;
}
bool IPAddressMatchesWithNetmask(der::Input addr1, der::Input addr2,
der::Input mask) {
if (addr1.size() != addr2.size() || addr1.size() != mask.size()) {
return false;
}
for (size_t i = 0; i < addr1.size(); i++) {
if ((addr1[i] & mask[i]) != (addr2[i] & mask[i])) {
return false;
}
}
return true;
}
BSSL_NAMESPACE_END