netdev - Re: [PATCH net-next v18 09/25] ovpn: implement packet processing

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Message-ID: <Z4pKMkDrujMWMlCW@hog>
Date: Fri, 17 Jan 2025 13:16:50 +0100
From: Sabrina Dubroca <sd@...asysnail.net>
To: Antonio Quartulli <antonio@...nvpn.net>
Cc: netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Donald Hunter <donald.hunter@...il.com>,
	Shuah Khan <shuah@...nel.org>, ryazanov.s.a@...il.com,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Simon Horman <horms@...nel.org>, linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org, Xiao Liang <shaw.leon@...il.com>
Subject: Re: [PATCH net-next v18 09/25] ovpn: implement packet processing

2025-01-13, 10:31:28 +0100, Antonio Quartulli wrote:
>  static bool ovpn_encrypt_one(struct ovpn_peer *peer, struct sk_buff *skb)
>  {
> -	ovpn_skb_cb(skb)->peer = peer;
> +	struct ovpn_crypto_key_slot *ks;
> +
> +	if (unlikely(skb->ip_summed == CHECKSUM_PARTIAL &&
> +		     skb_checksum_help(skb))) {
> +		net_warn_ratelimited("%s: cannot compute checksum for outgoing packet for peer %u\n",
> +				     netdev_name(peer->ovpn->dev), peer->id);
> +		return false;
> +	}
> +
> +	/* get primary key to be used for encrypting data */
> +	ks = ovpn_crypto_key_slot_primary(&peer->crypto);
> +	if (unlikely(!ks))
> +		return false;
>  
>  	/* take a reference to the peer because the crypto code may run async.
>  	 * ovpn_encrypt_post() will release it upon completion
> @@ -118,7 +244,8 @@ static bool ovpn_encrypt_one(struct ovpn_peer *peer, struct sk_buff *skb)

Adding in the few lines that got snipped:

	/* take a reference to the peer because the crypto code may run async.
	 * ovpn_encrypt_post() will release it upon completion
	 */
	if (unlikely(!ovpn_peer_hold(peer))) {
		DEBUG_NET_WARN_ON_ONCE(1);
		return false;
	}

This should never happen, but just in case, we'd want
ovpn_crypto_key_slot_put() here.

>  		return false;
>  	}

-- 
Sabrina