netdev - [PATCH net-next 0/2] netlink: multicast join notifications

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Date:   Thu, 30 Aug 2018 10:35:43 +0100
From:   Patrick Ruddy <pruddy@...tta.att-mail.com>
To:     netdev@...r.kernel.org
Cc:     roopa@...ulusnetworks.com, jiri@...nulli.us,
        stephen@...workplumber.org
Subject: [PATCH net-next 0/2] netlink: multicast join notifications

This patch is an update to https://patchwork.ozlabs.org/patch/571127/. The
previous patch was based on sending multicast MAC addresses in the
netlink messages to allow the programming of hardware. It was agreed to
rework this to use RTM_NEW/DELLINK messages which were more appropriate
for layer 2 addresses.
In the interim period it has become apparent that the applications actually
needs to see the L3 multicast addresses which are joined for FORUS
processing so this patch has been reworked to send the L3 multicast
addresses using RTM_NEW/DELADDR.
These new multicast L3 netlink notifications should use the IFA_MULTICAST
address type but this has been dropped in favour of IFA_ADDRESS as during
testing it was noticed that some applications - notably getaddrinfo in
lib6c assume that there is an IFA_ADDRESS in a RTM_NEW/DELADDR and
blindly dereference it.
Finally the RTM_GETADDR for both address families has been modified to
include the multicast l3 addresses.

Patrick Ruddy (2):
  netlink: ipv4 IGMP join notifications
  netlink: ipv6 MLD join notifications

 include/linux/igmp.h |  2 +
 net/ipv4/devinet.c   | 39 +++++++++++++------
 net/ipv4/igmp.c      | 90 ++++++++++++++++++++++++++++++++++++++++++++
 net/ipv6/addrconf.c  | 44 ++++++++++++++++------
 net/ipv6/mcast.c     | 66 ++++++++++++++++++++++++++++++++
 5 files changed, 218 insertions(+), 23 deletions(-)

-- 
2.17.1