netdev - Re: [PATCH] net: inet_diag: always export IPV6

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Date:	Thu, 09 Jul 2015 19:30:30 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Phil Sutter <phil@....cc>
Cc:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH] net: inet_diag: always export IPV6_V6ONLY sockopt

On Thu, 2015-07-09 at 18:38 +0200, Phil Sutter wrote:
> Is it possible to select that in a generic way? If I didn't misread the
> code, 'ss -l' filters them out locally. It looks like sk->sk_state can
> be used to determine that, but it seems to be used for TCP states only?
> Or is the value 10 (TCP_LISTEN) used for e.g. UDP as well?

You could specifically filter TCP_LISTEN | TCP_CLOSE

Like in :

diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 9bc26677058e..c3b1f3a0f4cf 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -152,8 +152,8 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 				       inet6_sk(sk)->tclass) < 0)
 				goto errout;
 
-		if (ipv6_only_sock(sk) &&
-		    nla_put_u8(skb, INET_DIAG_SKV6ONLY, 1))
+		if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
+		    nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
 			goto errout;
 	}
 #endif




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