ICMP extensions RFC: "
Recently-published RFC 5837 describes additions to ICMP messages that would allow you to gather more information (including interface ifIndex, IP address and name). Two obvious applications are enhanced traceroute and path MTU discovery where the new ICMP extensions could indicate which interface is the MTU bottleneck.
The RFC authors come from BT, Juniper and Cisco, so there’s a non-zero chance it will actually get implemented where it’s most needed.

