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Add Netlink Protocol Families to SockProtocol enum #1289

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merged 1 commit into from Aug 22, 2020

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sinkingpoint
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@sinkingpoint sinkingpoint commented Aug 8, 2020

Currently the SockProtocol enum is rather scarce. This commit adds the Netlink protocols
defined in netlink(7) to the SockProtocol enum allowing us to use the Nix socket library for
more in-depth Netlink work.

Because of the way libc sockets work, this is a bit more annoying than it has any right to be - the Socket Family and the Socket protocol are intertwined in that a given c_int protocol can represent different things depending on the family. This means that as we add values to this enum we're going to get collisions (Indeed, I've left out a few values that collided with the existing TCP/UDP Protocols). I'm not sure how we would want to handle this going forward - maybe different Protocol enums for different Familys, with Into<SockProtocol> methods?

I followed the existing pattern in this file when adding these, but perhaps as this enum gets bigger, we should use the libc_enum macro for cleanliness?

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Addresses #1288

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asomers commented Aug 17, 2020

This seems simple enough. And yes, libc_enum is certainly a better way to do this. Could you add a CHANGELOG entry?

Currently the SockProtocol enum is rather scarce. This commit adds the Netlink protocols
defined in netlink(7) to the SockProtocol enum allowing us to use the Nix socket library for
more indepth Netlink work
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Done @asomers - I figure changing to libc_enum involves changing the enum members names (Making them conform with libc naming standards) so would be a breaking change. Better to leave it out of this PR I think and address in a major release at some point. Thanks!

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Oof, good point. Yes, it probably isn't worth the small amount of incompatibility just for that.

bors r+

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bors bot commented Aug 22, 2020

Build succeeded:

@bors bors bot merged commit 1203d6c into nix-rust:master Aug 22, 2020
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2 participants