netdev - Re: [PATCH net] netfilter: remove the nh_scope test in rpfilter_lookup_reverse of ipt

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Date:	Sun, 4 Oct 2015 23:48:02 +0200
From:	Florian Westphal <fw@...len.de>
To:	Xin Long <lucien.xin@...il.com>
Cc:	network dev <netdev@...r.kernel.org>, fw@...len.de
Subject: Re: [PATCH net] netfilter: remove the nh_scope test in
 rpfilter_lookup_reverse of ipt_rpfilter

Xin Long <lucien.xin@...il.com> wrote:
> it seems the test is bogus and can be removed to fix this issue.
> 
> 	if (dev_match || flags & XT_RPFILTER_LOOSE)
> 		return FIB_RES_NH(res).nh_scope <= RT_SCOPE_HOST;
> 
> ipv6 does not have this issue.

netfilter patches should be sent to netfilter-devel@...r.kernel.org

>  #endif
> -	if (dev_match || flags & XT_RPFILTER_LOOSE)
> -		return FIB_RES_NH(res).nh_scope <= RT_SCOPE_HOST;
>  	return dev_match;
>  }

This breaks --loose option, no?

Thats why I earlier suggested to change this to

> -	if (dev_match || flags & XT_RPFILTER_LOOSE)
> -		return FIB_RES_NH(res).nh_scope <= RT_SCOPE_HOST;
+	return dev_match || flags & XT_RPFILTER_LOOSE;

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