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* Copyright (C) 2013-2015 Kay Sievers
* Copyright (C) 2013-2015 Greg Kroah-Hartman <>
* Copyright (C) 2013-2015 Daniel Mack <>
* Copyright (C) 2013-2015 David Herrmann <>
* Copyright (C) 2013-2015 Linux Foundation
* kdbus is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
#include "util.h"
#include "metadata.h"
* enum kdbus_msg_data_type - Type of kdbus_msg_data payloads
* @KDBUS_MSG_DATA_VEC: Data vector provided by user-space
* @KDBUS_MSG_DATA_MEMFD: Memfd payload
enum kdbus_msg_data_type {
* struct kdbus_msg_data - Data payload as stored by messages
* @type: Type of payload (KDBUS_MSG_DATA_*)
* @size: Size of the described payload
* @off: The offset, relative to the vec slice
* @start: Offset inside the memfd
* @file: Backing file referenced by the memfd
struct kdbus_msg_data {
unsigned int type;
u64 size;
union {
struct {
u64 off;
} vec;
struct {
u64 start;
struct file *file;
} memfd;
* struct kdbus_kmsg_resources - resources of a message
* @kref: Reference counter
* @dst_name: Short-cut to msg for faster lookup
* @fds: Array of file descriptors to pass
* @fds_count: Number of file descriptors to pass
* @data: Array of data payloads
* @vec_count: Number of VEC entries
* @memfd_count: Number of MEMFD entries in @data
* @data_count: Sum of @vec_count + @memfd_count
struct kdbus_msg_resources {
struct kref kref;
const char *dst_name;
struct file **fds;
unsigned int fds_count;
struct kdbus_msg_data *data;
size_t vec_count;
size_t memfd_count;
size_t data_count;
struct kdbus_msg_resources *
kdbus_msg_resources_ref(struct kdbus_msg_resources *r);
struct kdbus_msg_resources *
kdbus_msg_resources_unref(struct kdbus_msg_resources *r);
* struct kdbus_kmsg - internal message handling data
* @seq: Domain-global message sequence number
* @notify_type: Short-cut for faster lookup
* @notify_old_id: Short-cut for faster lookup
* @notify_new_id: Short-cut for faster lookup
* @notify_name: Short-cut for faster lookup
* @dst_name_id: Short-cut to msg for faster lookup
* @bloom_filter: Bloom filter to match message properties
* @bloom_generation: Generation of bloom element set
* @notify_entry: List of kernel-generated notifications
* @iov: Array of iovec, describing the payload to copy
* @iov_count: Number of array members in @iov
* @pool_size: Overall size of inlined data referenced by @iov
* @proc_meta: Appended SCM-like metadata of the sending process
* @conn_meta: Appended SCM-like metadata of the sending connection
* @res: Message resources
* @msg: Message from or to userspace
struct kdbus_kmsg {
u64 seq;
u64 notify_type;
u64 notify_old_id;
u64 notify_new_id;
const char *notify_name;
u64 dst_name_id;
const struct kdbus_bloom_filter *bloom_filter;
u64 bloom_generation;
struct list_head notify_entry;
struct iovec *iov;
size_t iov_count;
u64 pool_size;
struct kdbus_meta_proc *proc_meta;
struct kdbus_meta_conn *conn_meta;
struct kdbus_msg_resources *res;
/* variable size, must be the last member */
struct kdbus_msg msg;
struct kdbus_bus;
struct kdbus_conn;
struct kdbus_kmsg *kdbus_kmsg_new(struct kdbus_bus *bus, size_t extra_size);
struct kdbus_kmsg *kdbus_kmsg_new_from_cmd(struct kdbus_conn *conn,
struct kdbus_cmd_send *cmd_send);
void kdbus_kmsg_free(struct kdbus_kmsg *kmsg);
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