netdev - Re: [RFC net-next 11/22] dst: Metadata destinations

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Date:	Fri, 10 Jul 2015 21:57:31 +0300 (EEST)
From:	Julian Anastasov <ja@....bg>
To:	Thomas Graf <tgraf@...g.ch>
cc:	roopa@...ulusnetworks.com, rshearma@...cade.com,
	ebiederm@...ssion.com, hannes@...essinduktion.org,
	pshelar@...ira.com, jesse@...ira.com, davem@...emloft.net,
	daniel@...earbox.net, tom@...bertland.com, edumazet@...gle.com,
	jiri@...nulli.us, marcelo.leitner@...il.com,
	stephen@...workplumber.org, jpettit@...ira.com, kaber@...sh.net,
	netdev@...r.kernel.org, dev@...nvswitch.org
Subject: Re: [RFC net-next 11/22] dst: Metadata destinations


	Hello,

On Fri, 10 Jul 2015, Thomas Graf wrote:

> --- a/net/ipv4/route.c
> +++ b/net/ipv4/route.c
> @@ -1691,6 +1691,8 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
>  	   by fib_lookup.
>  	 */
>  
> +	skb_dst_drop(skb);
> +

	This is not very safe. There are places that
call ip_route_input() for temporary lookups and they
do not set NULL. For example, icmp_route_lookup(),
may be there are other such places...

	OTOH, ip_options_rcv_srr() looks correct to use
skb_dst_set(skb, NULL), may be such call should be
added if it is missing...

>  	if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr))
>  		goto martian_source;

Regards

--
Julian Anastasov <ja@....bg>
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