Currently the only protocols supported in SockProtocol are Tcp and Udp (for linux), while there are many more.

For example, I'm working with raw sockets and I need to specify a special ETH_P_ALL protocol (man 7 packet), and there is one important thing about it: its number has to be presented in network byte order when passed to the system socket call.

Currently the SockProtocol enum simply provides i32 constants, so I can't put htons conversion there since there is no const fn call for that.

There is also no way to provide an arbitrary integer as a protocol number to the nix's socket call, hence I'm left with no options.

So I would say it would be great to have an option to pass the protocol number as a number (i32 or whatever) to the socket call, but it might be there are other ways to address the issue.