NLMSG_PAYLOAD     100 include/uapi/linux/netlink.h #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
NLMSG_PAYLOAD     100 tools/include/uapi/linux/netlink.h #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))