linux-kernel - Re: [PATCH RESEND net-next v4 6/9] net: ip: make ip_route_input

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Message-ID: <62773e8f-884c-4bfe-b412-97ad976f9cb8@redhat.com>
Date: Tue, 5 Nov 2024 12:22:35 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Menglong Dong <menglong8.dong@...il.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 horms@...nel.org, dsahern@...nel.org, pablo@...filter.org,
 kadlec@...filter.org, roopa@...dia.com, razor@...ckwall.org,
 gnault@...hat.com, bigeasy@...utronix.de, hawk@...nel.org,
 idosch@...dia.com, dongml2@...natelecom.cn, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
 coreteam@...filter.org, bridge@...ts.linux.dev, bpf@...r.kernel.org
Subject: Re: [PATCH RESEND net-next v4 6/9] net: ip: make
 ip_route_input_noref() return drop reasons

Hi,

On 10/30/24 02:41, Menglong Dong wrote:
> @@ -175,10 +175,12 @@ static void ip_expire(struct timer_list *t)
>  
>  	/* skb has no dst, perform route lookup again */
>  	iph = ip_hdr(head);
> -	err = ip_route_input_noref(head, iph->daddr, iph->saddr, ip4h_dscp(iph),
> -				   head->dev);
> -	if (err)
> +	reason = ip_route_input_noref(head, iph->daddr, iph->saddr,
> +				      ip4h_dscp(iph), head->dev);
> +	if (reason)
>  		goto out;
> +	else
> +		reason = SKB_DROP_REASON_FRAG_REASM_TIMEOUT;

I think the else branch above is confusing - and unneeded.

Please move the assignment after the comment below, so it's clear why we
get a TIMEOUT drop reason.

Thanks,

Paolo