+ if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int bus_kernel_realize_attach_flags(sd_bus *bus) {
+ struct kdbus_cmd_update *update;
+ struct kdbus_item *n;
+
+ assert(bus);
+ assert(bus->is_kernel);
+
+ update = alloca0_align(offsetof(struct kdbus_cmd_update, items) +
+ ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)),
+ 8);
+
+ n = update->items;
+ n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
+ n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
+ n->data64[0] = bus->attach_flags;
+
+ update->size =
+ offsetof(struct kdbus_cmd_update, items) +
+ ALIGN8(n->size);
+
+ if (ioctl(bus->input_fd, KDBUS_CMD_CONN_UPDATE, update) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int bus_kernel_fix_attach_mask(void) {
+ _cleanup_free_ char *mask = NULL;
+ uint64_t m = (uint64_t) -1;
+ char buf[2+16+2];
+ int r;
+
+ /* By default we don't want any kdbus metadata fields to be
+ * suppressed, hence we reset the kernel mask for it to
+ * (uint64_t) -1. This is overridable via a kernel command
+ * line option, however. */
+
+ r = get_proc_cmdline_key("systemd.kdbus_attach_flags_mask=", &mask);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to read kernel command line: %m");
+
+ if (mask) {
+ const char *p = mask;
+
+ if (startswith(p, "0x"))
+ p += 2;
+
+ if (sscanf(p, "%" PRIx64, &m) != 1)
+ log_warning("Couldn't parse systemd.kdbus_attach_flags_mask= kernel command line parameter.");
+ }
+
+ sprintf(buf, "0x%" PRIx64 "\n", m);
+ r = write_string_file("/sys/module/kdbus/parameters/attach_flags_mask", buf);
+ if (r < 0)
+ return log_full_errno(
+ IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r,
+ "Failed to write kdbus attach mask: %m");
+
+ return 0;
+}
+
+int bus_kernel_get_bus_name(sd_bus *bus, char **name) {
+ struct kdbus_cmd_info cmd = {
+ .size = sizeof(struct kdbus_cmd_info),
+ };
+ struct kdbus_info *info;
+ struct kdbus_item *item;
+ char *n = NULL;
+ int r;
+
+ assert(bus);
+ assert(name);
+ assert(bus->is_kernel);
+
+ r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd);
+ if (r < 0)