netdev - Re: [PATCH bpf-next v2 2/3] bpf: Support socket lookup in CGROUP_SOCK

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Message-ID: <20181109193052.x6fxbji3oyxntea3@kafai-mbp.dhcp.thefacebook.com>
Date:   Fri, 9 Nov 2018 19:30:58 +0000
From:   Martin Lau <kafai@...com>
To:     Andrey Ignatov <rdna@...com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "joe@...d.net.nz" <joe@...d.net.nz>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH bpf-next v2 2/3] bpf: Support socket lookup in
 CGROUP_SOCK_ADDR progs

On Fri, Nov 09, 2018 at 10:54:01AM -0800, Andrey Ignatov wrote:
> Make bpf_sk_lookup_tcp, bpf_sk_lookup_udp and bpf_sk_release helpers
> available in programs of type BPF_PROG_TYPE_CGROUP_SOCK_ADDR.
> 
> Such programs operate on sockets and have access to socket and struct
> sockaddr passed by user to system calls such as sys_bind, sys_connect,
> sys_sendmsg.
> 
> It's useful to be able to lookup other sockets from these programs.
> E.g. sys_connect may lookup IP:port endpoint and if there is a server
> socket bound to that endpoint ("server" can be defined by saddr & sport
> being zero), redirect client connection to it by rewriting IP:port in
> sockaddr passed to sys_connect.
Acked-by: Martin KaFai Lau <kafai@...com>