netdev - Re: [PATCH net v2 1/2] ipv6: enforce flowi6_oif usage in ip6_dst_lookup

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Message-ID: <56AEC1C5.5000304@miraclelinux.com>
Date:	Mon, 1 Feb 2016 11:24:05 +0900
From:	YOSHIFUJI Hideaki <hideaki.yoshifuji@...aclelinux.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Cc:	hideaki.yoshifuji@...aclelinux.com,
	"David S. Miller" <davem@...emloft.net>,
	David Ahern <dsa@...ulusnetworks.com>,
	Hajime Tazaki <thehajime@...il.com>, lucien.xin@...il.com,
	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH net v2 1/2] ipv6: enforce flowi6_oif usage in
 ip6_dst_lookup_tail()



Hannes Frederic Sowa wrote:
> On 29.01.2016 12:30, Paolo Abeni wrote:
>> The current implementation of ip6_dst_lookup_tail basically
>> ignore the egress ifindex match: if the saddr is set,
>> ip6_route_output() purposefully ignores flowi6_oif, due
>> to the commit d46a9d678e4c ("net: ipv6: Dont add RT6_LOOKUP_F_IFACE
>> flag if saddr set"), if the saddr is 'any' the first route lookup
>> in ip6_dst_lookup_tail fails, but upon failure a second lookup will
>> be performed with saddr set, thus ignoring the ifindex constraint.
>>
>> This commit adds an output route lookup function variant, which
>> allows the caller to specify lookup flags, and modify
>> ip6_dst_lookup_tail() to enforce the ifindex match on the second
>> lookup via said helper.
>>
>> ip6_route_output() becames now a static inline function build on
>> top of ip6_route_output_flags(); as a side effect, out-of-tree
>> modules need now a GPL license to access the output route lookup
>> functionality.
>>
>> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
>> -- 
>> v1 -> v2 move the ip6_route_output() implementation into the header
> 
> Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> 
Acked-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>

-- 
Hideaki Yoshifuji <hideaki.yoshifuji@...aclelinux.com>
Technical Division, MIRACLE LINUX CORPORATION