netdev - ipv6:ping ipv6 address on the same host from the loopback

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Date:   Thu, 9 Feb 2023 21:42:44 +0800
From:   gaoxingwang <gaoxingwang1@...wei.com>
To:     <netdev@...r.kernel.org>
CC:     <davem@...emloft.net>, <yoshfuji@...ux-ipv6.org>,
        <dsahern@...nel.org>, <chenzhen126@...wei.com>,
        <liaichun@...wei.com>, <yanan@...wei.com>
Subject: ipv6:ping ipv6 address on the same host from the loopback

When I ping another ipv6 address on the same host from the loopback interface, it fails.
Is this what was expected? Or should it work successfully like ipv4?

Reproduction:
root@...t:~ # ifconfig ens8
ens8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 2008::8  prefixlen 128  scopeid 0x0<global>
        ether 52:54:00:7e:c2:26  txqueuelen 1000  (Ethernet)
        RX packets 59118  bytes 4270977 (4.0 MiB)
        RX errors 0  dropped 8643  overruns 0  frame 0
        TX packets 31  bytes 1882 (1.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

root@...t:~ # ping -c 3 -I ::1 2008::8
PING 2008::8(2008::8) from ::1 : 56 data bytes

--- 2008::8 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2049ms