[PATCH iproute2-next, v3 1/2] iproute2: expose netlink constants in UAPI

[Yuyang Huang <yuyanghuang@google.com>]

This change adds the following multicast related netlink constants to
the UAPI:

* RTNLGRP_IPV4_MCADDR and RTNLGRP_IPV6_MCADDR: Netlink multicast
  groups for IPv4 and IPv6 multicast address changes.
* RTM_NEWMULTICAST and RTM_DELMULTICAST: Netlink message types for
  multicast address additions and deletions.

Exposing these constants in the UAPI enables ip monitor to effectively
monitor and manage multicast group memberships.

Cc: Maciej Żenczykowski <maze@google.com>
Cc: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: Yuyang Huang <yuyanghuang@google.com>
---

Changelog since v2:
- Align RTM_NEWMULTICAST and RTM_GETMULTICAST enum definitions with
  existing code style.

 include/uapi/linux/rtnetlink.h | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index 4e6c8e14..04be20ee 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -93,7 +93,11 @@ enum {
 	RTM_NEWPREFIX	= 52,
 #define RTM_NEWPREFIX	RTM_NEWPREFIX
 
-	RTM_GETMULTICAST = 58,
+	RTM_NEWMULTICAST = 56,
+#define RTM_NEWMULTICAST RTM_NEWMULTICAST
+	RTM_DELMULTICAST,
+#define RTM_DELMULTICAST RTM_DELMULTICAST
+	RTM_GETMULTICAST,
 #define RTM_GETMULTICAST RTM_GETMULTICAST
 
 	RTM_GETANYCAST	= 62,
@@ -772,6 +776,10 @@ enum rtnetlink_groups {
 #define RTNLGRP_TUNNEL		RTNLGRP_TUNNEL
 	RTNLGRP_STATS,
 #define RTNLGRP_STATS		RTNLGRP_STATS
+	RTNLGRP_IPV4_MCADDR,
+#define RTNLGRP_IPV4_MCADDR	RTNLGRP_IPV4_MCADDR
+	RTNLGRP_IPV6_MCADDR,
+#define RTNLGRP_IPV6_MCADDR    RTNLGRP_IPV6_MCADDR
 	__RTNLGRP_MAX
 };
 #define RTNLGRP_MAX	(__RTNLGRP_MAX - 1)
-- 
2.47.0.338.g60cca15819-goog