1 files changed, 26 insertions, 3 deletions
diff --git a/src/libsystemd/sd-netlink/netlink-internal.h b/src/libsystemd/sd-netlink/netlink-internal.h
index dd4fa9d2af..98de4f0a83 100644
--- a/src/libsystemd/sd-netlink/netlink-internal.h
+++ b/src/libsystemd/sd-netlink/netlink-internal.h
@@ -1,7 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
-
 #include <linux/netlink.h>
 
 #include "sd-netlink.h"
@@ -20,7 +19,6 @@
 
 struct reply_callback {
         sd_netlink_message_handler_t callback;
-        void *userdata;
         usec_t timeout;
         uint64_t serial;
         unsigned prioq_idx;
@@ -29,11 +27,34 @@ struct reply_callback {
 struct match_callback {
         sd_netlink_message_handler_t callback;
         uint16_t type;
-        void *userdata;
 
         LIST_FIELDS(struct match_callback, match_callbacks);
 };
 
+typedef enum NetlinkSlotType {
+        NETLINK_REPLY_CALLBACK,
+        NETLINK_MATCH_CALLBACK,
+        _NETLINK_SLOT_INVALID = -1,
+} NetlinkSlotType;
+
+struct sd_netlink_slot {
+        unsigned n_ref;
+        sd_netlink *netlink;
+        void *userdata;
+        sd_netlink_destroy_t destroy_callback;
+        NetlinkSlotType type:2;
+
+        bool floating:1;
+        char *description;
+
+        LIST_FIELDS(sd_netlink_slot, slots);
+
+        union {
+                struct reply_callback reply_callback;
+                struct match_callback match_callback;
+        };
+};
+
 struct sd_netlink {
         RefCount n_ref;
 
@@ -69,6 +90,8 @@ struct sd_netlink {
 
         LIST_HEAD(struct match_callback, match_callbacks);
 
+        LIST_HEAD(sd_netlink_slot, slots);
+
         pid_t original_pid;
 
         sd_event_source *io_event_source;