linux: add rtnetlink mcast group definitions

These come in two flavors:

- RTNLGRP_* are bit indexes (arguments to setsockopt(2)) as used
  in the kernel with test_bit() but also userspace (see libnl
  examples).

- RTMGRP_* are bitmasks not used in the kernel; their use
  seems to be deprecated, at least according to comments in
  libnl, but documentation still references them.

The rationale for adding these definitions is that they're needed
to subscribe to kernel events via Netlink multicast groups.

1 files changed, 6 insertions, 0 deletions

diff --git a/libc-test/build.rs b/libc-test/build.rs
index ba428fc730..b332c2bda4 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -3208,6 +3208,12 @@ fn test_linux(target: &str) {
             | "NFULA_VLAN_UNSPEC" // v5.4+
             | "NFULA_VLAN_PROTO" // v5.4+
             | "NFULA_VLAN_TCI" => true, // v5.4+
+            | "RTNLGRP_NEXTHOP" // linux v5.3+
+            | "RTNLGRP_BRVLAN" // linux v5.6+
+            | "RTNLGRP_MCTP_IFADDR" // linux v5.17+
+            | "RTNLGRP_TUNNEL" // linux v5.18+
+            | "RTNLGRP_STATS" // linux v5.18+
+                => true,
 
             _ => false,
         }