linux-kernel - Re: [PATCH] netfilter: nf_conntrack: table full detailed log

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Message-ID: <aC2q2OgYNVd8-5Yw@calendula>
Date: Wed, 21 May 2025 12:28:40 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: lvxiafei <xiafei_xupt@....com>
Cc: Jozsef Kadlecsik <kadlec@...filter.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>, lvxiafei <lvxiafei@...setime.com>,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netfilter: nf_conntrack: table full detailed log

Hi,

On Thu, May 08, 2025 at 04:13:12PM +0800, lvxiafei wrote:
> From: lvxiafei <lvxiafei@...setime.com>
> 
> Add the netns field in the "nf_conntrack: table full,
> dropping packet" log to help locate the specific netns
> when the table is full.
> 
> Signed-off-by: lvxiafei <lvxiafei@...setime.com>
> ---
>  net/netfilter/nf_conntrack_core.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
> index 7f8b245e287a..71849960cf0c 100644
> --- a/net/netfilter/nf_conntrack_core.c
> +++ b/net/netfilter/nf_conntrack_core.c
> @@ -1659,7 +1659,8 @@ __nf_conntrack_alloc(struct net *net,
>  			if (!conntrack_gc_work.early_drop)
>  				conntrack_gc_work.early_drop = true;
>  			atomic_dec(&cnet->count);
> -			net_warn_ratelimited("nf_conntrack: table full, dropping packet\n");
> +			net_warn_ratelimited("nf_conntrack: table full in netns %u, dropping packet\n",
> +					     net->ns.inum);

Maybe print this only if this is not init_netns?

Thanks

>  			return ERR_PTR(-ENOMEM);
>  		}
>  	}
> -- 
> 2.40.1
>