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Date:   Wed, 19 Sep 2018 21:47:04 -0700
From:   David Ahern <>
        Roopa Prabhu <>
Cc:     netdev <>,
        Jiří Pírko <>,
        Stephen Hemminger <>,
        Nikolay Aleksandrov <>
Subject: Re: [PATCH net-next v3 1/2] netlink: ipv4 igmp join notifications

On 9/18/18 6:12 AM, Patrick Ruddy wrote:
> I've hit a small snag with adding the new groups. The number of defined
> groups currently sits at 31 so I can only add one before hitting the

I believe you have no more available. RTNLGRP_* has been defined from 0
(RTNLGRP_NONE) to 31 (RTNLGRP_IPV6_MROUTE_R) which covers the u32 range.

> limit defined by the 32 bit groups bitmask in socakddr_nl. I can use 1
> group for both v4 and v6 notifications which seems like the sensible
> options since the AF is carried separately, but it breaks the precedent
> where there are separate IPV4 and IPV6 groups for IFADDR.
> I have the combined group patches ready and can share them if that's
> the preference.
> Has there been any previous discussion about extending the number of
> availabel groups?

I have not tried it, but from a prior code review I believe you have you
use setsockopt to add groups > 31.

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