PF_RT_CPID
snl_add_msg_attr_u32(nw, PF_RT_CPID, r->cpid);
{. type = PF_RT_CPID, .off = _OUT(r.cpid), .cb = snl_attr_get_uint32 },
{. type = PF_RT_CPID, .off = _OUT(cpid), .cb = nlattr_get_uint32 },
nlattr_add_u32(nw, PF_RT_CPID, rule->cpid);