Subject: Re: [PATCH net-next 0/2] net: vrf: Fixup PKTINFO to return enslaved device index

From: David Ahern <[email-masked]>
Date: Fri, 6 May 2016 19:04:47 -0600

On 5/5/16 1:37 PM, David Ahern wrote:
> Applications such as OSPF and BFD need the original ingress device not
> the VRF device; the latter can be derived from the former. To that end
> move the packet intercept from an rx handler that is invoked by
> __netif_receive_skb_core to the ipv4 and ipv6 receive processing.
>
> IPv6 already saves the skb_iif to the control buffer in ipv6_rcv. Since
> the skb->dev has not been switched the cb has the enslaved device. Make
> the same happen for IPv4 by adding the skb_iif to inet_skb_parm and set
> it in ipv4 code after clearing the skb control buffer similar to IPv6.
>  From there the pktinfo can just pull it from cb with the PKTINFO_SKB_CB
> cast.
>
> David Ahern (2):
>    net: l3mdev: Add hook in ip and ipv6
>    net: original ingress device index in PKTINFO
>
>   drivers/net/vrf.c         | 186 ++++++++++++++++++++++------------------------
>   include/linux/ipv6.h      |   3 +-
>   include/linux/netdevice.h |   2 +
>   include/net/ip.h          |   1 +
>   include/net/l3mdev.h      |  43 +++++++++++
>   include/net/tcp.h         |   3 +-
>   net/core/dev.c            |   3 +-
>   net/ipv4/ip_input.c       |   8 ++
>   net/ipv4/ip_sockglue.c    |   7 +-
>   net/ipv6/ip6_input.c      |   7 ++
>   10 files changed, 161 insertions(+), 102 deletions(-)
>

Dave: please ignore. I have an update that better encapsulates the 
inet6_iif and tcp iif change. Will send v2 shortly.