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

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Message-ID: <56AB8C87.1010904@cumulusnetworks.com>
Date:	Fri, 29 Jan 2016 09:00:07 -0700
From:	David Ahern <dsa@...ulusnetworks.com>
To:	Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>,
	Hajime Tazaki <thehajime@...il.com>, lucien.xin@...il.com,
	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH net v2 1/2] ipv6: enforce flowi6_oif usage in
 ip6_dst_lookup_tail()

On 1/29/16 4:30 AM, 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>
> --

Acked-by: David Ahern <dsa@...ulusnetworks.com>