r0 = socket$netlink(0x10, 0x3, 0x0) r1 = fcntl$dupfd(r0, 0x0, r0) sendmsg$nl_generic(r1, &(0x7f0000000280)={0x0, 0x0, &(0x7f00000002c0)={&(0x7f0000000300)={0x28, 0x18, 0xc21, 0x0, 0x0, {0x80}, [@typed={0x14, 0x0, 0x0, 0x0, @ipv6=@mcast1}]}, 0x28}}, 0x0)