netdev - Re: problem of "ipv4: revert Set rt->rt_iif more sanely on output routes."

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Date:	Thu, 07 Apr 2011 17:29:04 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: problem of "ipv4: revert Set rt->rt_iif more sanely on output routes."

OGAWA Hirofumi <hirofumi@...l.parknet.co.jp> writes:

> David Miller <davem@...emloft.net> writes:
>
>> So fix is something like:
>>
>> 1) Add "int rt_route_iif;" to struct rtable
>>
>> 2) For input routes, always set rt_route_iif to same value as rt_iif
>>
>> 3) For output routes, always set rt_route_iif to zero.  Set rt_iif
>>    as it is done currently.
>>
>> 4) Change rt_is_{output,input}_route() to test rt_route_iif
>>
>> This should fix the bug and not introduce new regressions.
>>
>> Can you write and test such a patch with your test case?
>
> Ok. I'll try, but I'm not sure I understand the above correctly. Well,
> I'll send the patch after testing.

This patch seems to work for avahi-daemon without any warning.

BTW, the above meant change from (there was before) "fl.iif" to
"rt_route_iif"? If so, this patch is not enough. I'm not sure

+	rth->rt_route_iif = 0;
+	rth->rt_iif	= oldflp4->flowi4_oif ? : dev_out->ifindex;

is correct one or not. Please review.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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