netdev - Re: [PATCH net-next v2 2/2] tcp_diag: report TCP MD5 signing keys and addresses

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Message-ID: <1503718885.11498.20.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Fri, 25 Aug 2017 20:41:25 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Ivan Delalande <colona@...sta.com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 2/2] tcp_diag: report TCP MD5 signing keys
 and addresses

On Fri, 2017-08-25 at 18:53 -0700, Ivan Delalande wrote:
> Report TCP MD5 (RFC2385) signing keys, addresses and address prefixes to
> processes with CAP_NET_ADMIN requesting INET_DIAG_INFO. Currently it is
> not possible to retrieve these from the kernel once they have been
> configured on sockets.

...

> +static int inet_diag_put_md5sig(struct sk_buff *skb,
> +				const struct tcp_md5sig_info *md5sig)
> +{
> +	const struct tcp_md5sig_key *key;
> +	struct nlattr *attr;
> +	struct tcp_md5sig *info;
> +	int md5sig_count = 0;
> +
> +	hlist_for_each_entry_rcu(key, &md5sig->head, node)
> +		md5sig_count++;
> +
> +	attr = nla_reserve(skb, INET_DIAG_MD5SIG,
> +			   md5sig_count * sizeof(struct tcp_md5sig));
> +	if (!attr)
> +		return -EMSGSIZE;
> +
> +	info = nla_data(attr);
> +	hlist_for_each_entry_rcu(key, &md5sig->head, node) {
> +		inet_diag_md5sig_fill(info, key);
> +		info++;
> +	}
> +
> +	return 0;
> +}
> +#endif

Unless I missed something, I am sure I gave a feedback on this function
already :/