Re: [PATCH net-next 0/2] New getsockopt option to retrieve socket cookie

[David Miller <davem@davemloft.net>]

From: Chenbo Feng <chenbofeng.kernel@gmail.com>
Date: Wed,  5 Apr 2017 19:00:54 -0700

> In the current kernel socket cookie implementation, there is no simple
> and direct way to retrieve the socket cookie based on file descriptor. A
> process mat need to get it from sock fd if it want to correlate with
> sock_diag output or use a bpf map with new socket cookie function.
> 
> If userspace wants to receive the socket cookie for a given socket fd,
> it must send a SOCK_DIAG_BY_FAMILY dump request and look for the 5-tuple.
> This is slow and can be ambiguous in the case of sockets that have the
> same 5-tuple (e.g., tproxy / transparent sockets, SO_REUSEPORT sockets,
> etc.).
> 
> As shown in the example program. The xt_eBPF program is using socket cookie
> to record the network traffics statistics and with the socket cookie
> retrieved by getsockopt. The program can directly access to a specific
> socket data without scanning the whole bpf map.

Series applied, thank you.