lokinet/llarp/net/net_bits.hpp

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#pragma once
#include "net_int.hpp"
namespace llarp
{
/// get a netmask with the higest numset bits set
constexpr huint128_t
_netmask_ipv6_bits(uint32_t numset)
{
return (128 - numset) ? (huint128_t{1} << numset) | _netmask_ipv6_bits(numset + 1)
: huint128_t{0};
}
constexpr huint128_t
netmask_ipv6_bits(uint32_t numset)
{
return _netmask_ipv6_bits(128 - numset);
}
/// get a netmask with the higest numset bits set
constexpr uint32_t
_netmask_ipv4_bits(uint32_t numset)
{
return (32 - numset) ? (1 << numset) | _netmask_ipv4_bits(numset + 1) : 0;
}
/// get a netmask given some /N range
constexpr huint32_t
netmask_ipv4_bits(uint32_t num)
{
return huint32_t{_netmask_ipv4_bits(32 - num)};
}
constexpr huint32_t
ipaddr_ipv4_bits(uint32_t a, uint32_t b, uint32_t c, uint32_t d)
{
return huint32_t{(d) | (c << 8) | (b << 16) | (a << 24)};
}
// IPv4 mapped address live at ::ffff:0:0/96
constexpr std::array<uint8_t, 12> ipv4_map_prefix{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff};
namespace net
{
inline auto
ipaddr_netmask_bits(uint32_t bits, int af)
{
if (af == AF_INET6)
return netmask_ipv6_bits(bits);
return ExpandV4(netmask_ipv4_bits(bits));
};
} // namespace net
} // namespace llarp