PF_RT_KEEP_STATE
snl_add_msg_attr_u8(nw, PF_RT_KEEP_STATE, r->keep_state);
{ .type = PF_RT_KEEP_STATE, .off = _OUT(r.keep_state), .cb = snl_attr_get_uint8 },
nlattr_add_u8(nw, PF_RT_KEEP_STATE, rule->keep_state);
{ .type = PF_RT_KEEP_STATE, .off = _OUT(keep_state), .cb = nlattr_get_uint8 },