netdev - Re: IGMP on IPv6

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Date:   Tue, 25 Apr 2017 22:24:58 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Murali Karicheri <m-karicheri2@...com>
Cc:     Hangbin Liu <liuhangbin@...il.com>,
        "open list:TI NETCP ETHERNET DRIVER" <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>
Subject: Re: IGMP on IPv6

On Tue, Apr 25, 2017 at 9:16 AM, Murali Karicheri <m-karicheri2@...com> wrote:
> On 04/18/2017 06:37 PM, Cong Wang wrote:
>> Did you assign IPv4 and IPv6 addresses to the HSR master device?
>
> No. I just used IPv4. From the trace mld_ifc_timer_expire() -> mld_sendpack() -> ip6_output()
> do you know what is it trying to do? Is it some neighbor discovery message or something
> going over the lower interface instead of the hsr interface?
>

IPv6 is special here because it has link-local address configured
automatically for each device, so this mld_ifc_timer is armed
for link-local multicasts. See:


 464         /* Join interface-local all-node multicast group */
 465         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 466
 467         /* Join all-node multicast group */
 468         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 469
 470         /* Join all-router multicast group if forwarding is set */
 471         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 472                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);