netdev - Re: [PATCH v2 net] sk_buff: drop all skb extensions on free and skb scrubbing

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Date:   Thu, 26 Sep 2019 12:05:11 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Florian Westphal <fw@...len.de>, netdev@...r.kernel.org
Cc:     steffen.klassert@...unet.com, paulb@...lanox.com,
        vladbu@...lanox.com
Subject: Re: [PATCH v2 net] sk_buff: drop all skb extensions on free and skb
 scrubbing



On 9/26/19 11:37 AM, Florian Westphal wrote:
> Now that we have a 3rd extension, add a new helper that drops the
> extension space and use it when we need to scrub an sk_buff.
> 

>  }
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index f12e8a050edb..01d65206f4fb 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -5119,7 +5119,7 @@ void skb_scrub_packet(struct sk_buff *skb, bool xnet)
>  	skb->skb_iif = 0;
>  	skb->ignore_df = 0;
>  	skb_dst_drop(skb);
> -	secpath_reset(skb);
> +	skb_ext_reset(skb);
>  	nf_reset(skb);
>  	nf_reset_trace(skb);


It is unfortunate nf_reset(skb) will call skb_ext_del(skb, SKB_EXT_BRIDGE_NF),
which is useless after skb_ext_reset(skb) 

Maybe time for a nf_ct_reset() helper only dealing with nfct.