RTM_MAX 171 include/uapi/linux/rtnetlink.h #define RTM_NR_MSGTYPES (RTM_MAX + 1 - RTM_BASE) RTM_MAX 5169 net/core/rtnetlink.c if (type > RTM_MAX) RTM_MAX 169 security/selinux/nlmsgtab.c BUILD_BUG_ON(RTM_MAX != (RTM_NEWNEXTHOP + 3));