netdev - Re: [PATCH net-next v5 2/3] bpf: Add new cgroup attach type to enable sock modifications

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Date:   Tue, 29 Nov 2016 14:01:44 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     netdev@...r.kernel.org, daniel@...que.org, ast@...com,
        daniel@...earbox.net, maheshb@...gle.com, tgraf@...g.ch
Subject: Re: [PATCH net-next v5 2/3] bpf: Add new cgroup attach type to enable
 sock modifications

On 11/29/16 1:01 PM, Alexei Starovoitov wrote:
> Could you also expose sk_protcol and sk_type as read only fields?
> They have user space visible values already and will make this new
> BPF_PROG_TYPE_CGROUP_SOCK program type much more useful beyond vrf
> use case. Like we'll be able to write a tiny bpf program to block all
> raw sockets or all udp sockets for an application within a given cgroup.
> If someone would want to prevent udp traffic from an application,
> it can be done here within close to zero overhead for socket() syscall
> instead of checking every packet at networking layer.
> It can help vrf use case as well, so you can auto-bindtodevice
> only udp and tcp sockets instead of all... or do it for ipv4 or ipv6 only.
> Plenty of interesting opportunities with just two extra fields
> that cost nothing when not in use.

sure. for completeness I'll add sk_family too.