RTM_NEWNEIGH
const char *cmd = get_action_name(hdr, RTM_NEWNEIGH);
case RTM_NEWNEIGH:
struct nlmsghdr *hdr = snl_create_msg_request(&nw, RTM_NEWNEIGH);
struct nlmsghdr *hdr = snl_create_msg_request(&nw, RTM_NEWNEIGH);