netdev - Re: [PATCH net] arp: filter NOARP neighbours for SIOCGARP

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Date:	Wed, 29 Jul 2015 11:15:51 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, valas@...gle.com, willemb@...gle.com
Subject: Re: [PATCH net] arp: filter NOARP neighbours for SIOCGARP

On Tue, 2015-07-28 at 23:41 -0700, David Miller wrote:

> Applied, thanks Eric.
Thanks David

Note that IPv6 is completely broken after 'arp off' sequence.

ND destination MAC are a copy of eth0 MAC address, instead of the required multicast.

lpaa23:~# ip link set dev eth0 arp off
lpaa23:~# ping6 4444::555:0027
PING 4444::555:0027(4444::555:27) 56 data bytes
02:05:13.742684 00:1a:11:c3:0d:7f > 00:1a:11:c3:0d:7f, ethertype IPv6 (0x86dd), length 118: 4444::555:23 > 4444::555:27: ICMP6, echo request, seq 1, length 64
02:05:14.742200 00:1a:11:c3:0d:7f > 00:1a:11:c3:0d:7f, ethertype IPv6 (0x86dd), length 118: 4444::555:23 > 4444::555:27: ICMP6, echo request, seq 2, length 64
^C
--- 4444::555:0027 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 999ms

lpaa23:~# ip link set dev eth0 arp on 

lpaa23:~# ip -6 neigh sh dev eth0
fe80::21a:11ff:fec3:d45 lladdr 00:1a:11:c3:0d:45 STALE
4444::555:26  FAILED
4444::555:25  FAILED

lpaa23:~# ping6 4444::555:0027
PING 4444::555:0027(4444::555:27) 56 data bytes
02:12:15.698654 00:1a:11:c3:0d:7f > 00:1a:11:c3:0d:7f, ethertype IPv6 (0x86dd), length 118: 4444::555:23 > 4444::555:27: ICMP6, echo request, seq 1, length 64
02:12:16.698249 00:1a:11:c3:0d:7f > 00:1a:11:c3:0d:7f, ethertype IPv6 (0x86dd), length 118: 4444::555:23 > 4444::555:27: ICMP6, echo request, seq 2, length 64
02:12:17.698224 00:1a:11:c3:0d:7f > 00:1a:11:c3:0d:7f, ethertype IPv6 (0x86dd), length 118: 4444::555:23 > 4444::555:27: ICMP6, echo request, seq 3, length 64
^C
--- 4444::555:0027 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 1999ms

lpaa23:~# ip -6 neigh flush dev eth0

lpaa23:~# ip -6 neigh sh dev eth0
4444::555:24  FAILED
4444::555:28  FAILED
fe80::21a:11ff:fec3:d45  FAILED
4444::555:26  FAILED
4444::555:25  FAILED

Oh well...


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