inline Try<IPNetwork> IPNetwork::create(const IP& address, int prefix)
{
if (prefix < 0) {
return Error("Subnet prefix is negative");
}
switch (address.family()) {
case AF_INET: {
if (prefix > 32) {
return Error("Subnet prefix is larger than 32");
}
return IPNetwork(address, IP(0xffffffff << (32 - prefix)));
}
default: {
UNREACHABLE();
}
}
}
inline Try<IPNetwork> IPNetwork::create(const IP& address, const IP& netmask)
{
if (address.family() != netmask.family()) {
return Error(
"The network families of the IP address '" +
stringify(address.family()) + "' and the IP netmask '" +
stringify(netmask.family()) + "' do not match");
}
switch (address.family()) {
case AF_INET: {
uint32_t mask = ntohl(netmask.in().get().s_addr);
if (((~mask + 1) & (~mask)) != 0) {
return Error("Netmask is not valid");
}
return IPNetwork(address, netmask);
}
default: {
UNREACHABLE();
}
}
}
inline Try<IPNetwork> IPNetwork::create(const IP& address, int prefix)
{
if (prefix < 0) {
return Error("Subnet prefix is negative");
}
switch (address.family()) {
case AF_INET: {
if (prefix > 32) {
return Error("Subnet prefix is larger than 32");
}
// Avoid left-shifting by 32 bits when prefix is 0.
uint32_t mask = 0;
if (prefix > 0) {
mask = 0xffffffff << (32 - prefix);
}
return IPNetwork(address, IP(mask));
}
default: {
UNREACHABLE();
}
}
}
