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In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 01/04/2025 14:51, Sabrina Dubroca wrote: > 2025-03-18, 02:40:51 +0100, Antonio Quartulli wrote: >> @@ -124,6 +154,13 @@ void ovpn_decrypt_post(void *data, int ret) >> goto drop; >> } >> >> + if (ovpn_is_keepalive(skb)) { >> + net_dbg_ratelimited("%s: ping received from peer %u\n", >> + netdev_name(peer->ovpn->dev), >> + peer->id); >> + goto drop_nocount; >> + } >> + >> net_info_ratelimited("%s: unsupported protocol received from peer %u\n", >> netdev_name(peer->ovpn->dev), peer->id); >> goto drop; >> @@ -149,6 +186,7 @@ void ovpn_decrypt_post(void *data, int ret) >> drop: >> if (unlikely(skb)) >> dev_core_stats_rx_dropped_inc(peer->ovpn->dev); >> +drop_nocount: >> if (likely(peer)) >> ovpn_peer_put(peer); >> if (likely(ks)) >> kfree_skb(skb); >> } > > Again a small thing: in the case of a keepalive message, it would also > be nice to use consume_skb instead of kfree_skb. Quoting from the doc > for consume_skb: > > * Functions identically to kfree_skb, but kfree_skb assumes that the frame > * is being dropped after a failure and notes that I agree! I always try to pay attention to when consume_skb() should be used, but I must have missed this special case. > > > > Something like this maybe (not compiled): > > /* skb is passed to upper layer - don't free it */ > skb = NULL; > drop: > if (unlikely(skb)) > dev_core_stats_rx_dropped_inc(peer->ovpn->dev); > kfree_skb(skb); > skb = NULL; > drop_nocount: > if (likely(peer)) > ovpn_peer_put(peer); > if (likely(ks)) > ovpn_crypto_key_slot_put(ks); > consume_skb(skb); > > > Either that or I can call consume_skb(skb) and set skb = NULL before jumping to drop_nocount (haven't fully checked if possible). I'll see which version is better. Thanks for pointing this out! Regards, -- Antonio Quartulli OpenVPN Inc.