netdev - Re: [PATCH net-next v5 2/2] tcp_diag: report TCP MD5 signing keys and addresses

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Date:   Fri, 1 Sep 2017 02:21:18 +0200
From:   Ivan Delalande <colona@...sta.com>
To:     Sabrina Dubroca <sd@...asysnail.net>
Cc:     David Miller <davem@...emloft.net>,
        Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v5 2/2] tcp_diag: report TCP MD5 signing keys
 and addresses

On Fri, Sep 01, 2017 at 01:26:33AM +0200, Sabrina Dubroca wrote:
> 2017-08-31, 09:59:39 -0700, Ivan Delalande wrote:
> > diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
> > index a748c74aa8b7..abbf0edcf6c2 100644
> > --- a/net/ipv4/tcp_diag.c
> > +++ b/net/ipv4/tcp_diag.c
> [...]
> > +static int tcp_diag_get_aux(struct sock *sk, bool net_admin,
> > +			    struct sk_buff *skb)
> > +{
> > +#ifdef CONFIG_TCP_MD5SIG
> > +	if (net_admin) {
> 
> In tcp_diag_get_aux_size() you put a check for sk_fullsock. I don't
> see anything preventing you from reaching this with a !fullsock?

Currently handler->idiag_get_aux is only called from inet_sk_diag_fill
which has a `BUG_ON(!sk_fullsock(sk));`, but I could add another
explicit check in that function if you think it's more consistent.

Actually, I wasn't sure when adding this idiag_get_aux in v2 if it
should be called from inet_twsk_diag_fill, inet_req_diag_fill and
inet_csk_diag_fill, or just the last one. I chose that simpler approach
for now to avoid duplicating these state checks in the idiag_get_aux
defined by protocols and because we didn't need for INET_DIAG_MD5SIG,
but it shouldn't be too hard to change. Do you think this could be
useful for other protocols or attributes?

Thank you,
-- 
Ivan Delalande
Arista Networks