Re: [PATCH net-next] net: Only honor ifindex in IP_PKTINFO if non-0

From: David Ahern <redacted>
Date: Tue, 6 Mar 2018 13:52:05 -0700

On 2/16/18 12:03 PM, David Ahern wrote:

quoted

Only allow ifindex from IP_PKTINFO to override SO_BINDTODEVICE settings
if the index is actually set in the message.

Signed-off-by: David Ahern <redacted>
---
 net/ipv4/ip_sockglue.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Dave: Any chance this can get backported to 4.14 and 4.9 stable
releases? Right now, net-snmp is dead in the water with VRF because it
uses IP_PKTINFO to set the source address AND in the process sets the
ifindex to 0 to allow asymmetric routing (request received on one
interface and response goes out a different one). This patch allows 'ip
vrf exec mgmt snmpd' to work.

Ok, I've put this patch into 'net' and will let it soak there, and
also queue it up for a future -stable submission.

Thanks David.