NLMSG_LENGTH       83 include/uapi/linux/netlink.h #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
NLMSG_LENGTH       84 include/uapi/linux/netlink.h #define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))