netdev - Re: [PATCH v2 21/25] tcp: authopt: Add initial l3index support

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Date:   Tue, 2 Nov 2021 21:06:43 -0600
From:   David Ahern <dsahern@...il.com>
To:     Leonard Crestez <cdleonard@...il.com>,
        David Ahern <dsahern@...nel.org>,
        Shuah Khan <shuah@...nel.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Kuniyuki Iwashima <kuniyu@...zon.co.jp>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Yuchung Cheng <ycheng@...gle.com>,
        Francesco Ruggeri <fruggeri@...sta.com>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Christoph Paasch <cpaasch@...le.com>,
        Ivan Delalande <colona@...sta.com>,
        Priyaranjan Jha <priyarjha@...gle.com>, netdev@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 21/25] tcp: authopt: Add initial l3index support

On 11/1/21 10:34 AM, Leonard Crestez wrote:
> @@ -584,10 +614,24 @@ int tcp_set_authopt_key(struct sock *sk, sockptr_t optval, unsigned int optlen)
>  		return -EINVAL;
>  	err = tcp_authopt_alg_require(alg);
>  	if (err)
>  		return err;
>  
> +	/* check ifindex is valid (zero is always valid) */
> +	if (opt.flags & TCP_AUTHOPT_KEY_IFINDEX && opt.ifindex) {
> +		struct net_device *dev;
> +
> +		rcu_read_lock();
> +		dev = dev_get_by_index_rcu(sock_net(sk), opt.ifindex);
> +		if (dev && netif_is_l3_master(dev))
> +			l3index = dev->ifindex;
> +		rcu_read_unlock();

rcu_read_lock()... rcu_read_unlock() can be replaced with
netif_index_is_l3_master(...)