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 <redacted>
Date: Sat, 13 Aug 2016 01:13:38 +0900

quoted

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 <redacted>

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.