netdev - Re: [PATCH net v2] net: ipv6: Fix ping to link-local addresses.

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Date:	Mon, 15 Aug 2016 12:44:27 -0600
From:	David Ahern <dsa@...ulusnetworks.com>
To:	David Miller <davem@...emloft.net>, lorenzo@...gle.com
Cc:	netdev@...r.kernel.org, hannes@...essinduktion.org, ek@...gle.com,
	hideaki.yoshifuji@...aclelinux.com
Subject: Re: [PATCH net v2] net: ipv6: Fix ping to link-local addresses.

On 8/15/16 11:55 AM, David Miller wrote:
> From: Lorenzo Colitti <lorenzo@...gle.com>
> Date: Sat, 13 Aug 2016 01:13:38 +0900
> 
>> ping_v6_sendmsg does not set flowi6_oif in response to
>> sin6_scope_id or sk_bound_dev_if, so it is not possible to use
>> these APIs to ping an IPv6 address on a different interface.
>> Instead, it sets flowi6_iif, which is incorrect but harmless.
>>
>> Stop setting flowi6_iif, and support various ways of setting oif
>> in the same priority order used by udpv6_sendmsg.
>>
>> Tested: https://android-review.googlesource.com/#/c/254470/
>> Signed-off-by: Lorenzo Colitti <lorenzo@...gle.com>
> 
> I'm expecting a new version of this patch with changes handling
> the situation that VRF needs.

The vrf situation does not apply here - at least not yet. Maybe I am missing something but ping_v6_sendmsg does not support IPV6_PKTINFO, so the potential oif override of sk_bound_dev_if is not there.

I'll add this to the to-do list -- make IPv6 compatible with IPv4 wrt PKTINFO and then add in the VRF fix up discussed.