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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2/*
3 * Management Component Transport Protocol (MCTP)
4 *
5 * Copyright (c) 2021 Code Construct
6 * Copyright (c) 2021 Google
7 */
8
9#ifndef __UAPI_MCTP_H
10#define __UAPI_MCTP_H
11
12#include <linux/types.h>
13#include <linux/socket.h>
14#include <linux/netdevice.h>
15
16typedef __u8 mctp_eid_t;
17
18struct mctp_addr {
19 mctp_eid_t s_addr;
20};
21
22struct sockaddr_mctp {
23 __kernel_sa_family_t smctp_family;
24 __u16 __smctp_pad0;
25 unsigned int smctp_network;
26 struct mctp_addr smctp_addr;
27 __u8 smctp_type;
28 __u8 smctp_tag;
29 __u8 __smctp_pad1;
30};
31
32struct sockaddr_mctp_ext {
33 struct sockaddr_mctp smctp_base;
34 int smctp_ifindex;
35 __u8 smctp_halen;
36 __u8 __smctp_pad0[3];
37 __u8 smctp_haddr[MAX_ADDR_LEN];
38};
39
40/* A "fully qualified" MCTP address, which includes the system-local network ID,
41 * required to uniquely resolve a routable EID.
42 */
43struct mctp_fq_addr {
44 unsigned int net;
45 mctp_eid_t eid;
46};
47
48#define MCTP_NET_ANY 0x0
49
50#define MCTP_ADDR_NULL 0x00
51#define MCTP_ADDR_ANY 0xff
52
53#define MCTP_TAG_MASK 0x07
54#define MCTP_TAG_OWNER 0x08
55#define MCTP_TAG_PREALLOC 0x10
56
57#define MCTP_OPT_ADDR_EXT 1
58
59#define SIOCMCTPALLOCTAG (SIOCPROTOPRIVATE + 0)
60#define SIOCMCTPDROPTAG (SIOCPROTOPRIVATE + 1)
61#define SIOCMCTPALLOCTAG2 (SIOCPROTOPRIVATE + 2)
62#define SIOCMCTPDROPTAG2 (SIOCPROTOPRIVATE + 3)
63
64/* Deprecated: use mctp_ioc_tag_ctl2 / TAG2 ioctls instead, which defines the
65 * MCTP network ID as part of the allocated tag. Using this assumes the default
66 * net ID for allocated tags, which may not give correct behaviour on system
67 * with multiple networks configured.
68 */
69struct mctp_ioc_tag_ctl {
70 mctp_eid_t peer_addr;
71
72 /* For SIOCMCTPALLOCTAG: must be passed as zero, kernel will
73 * populate with the allocated tag value. Returned tag value will
74 * always have TO and PREALLOC set.
75 *
76 * For SIOCMCTPDROPTAG: userspace provides tag value to drop, from
77 * a prior SIOCMCTPALLOCTAG call (and so must have TO and PREALLOC set).
78 */
79 __u8 tag;
80 __u16 flags;
81};
82
83struct mctp_ioc_tag_ctl2 {
84 /* Peer details: network ID, peer EID, local EID. All set by the
85 * caller.
86 *
87 * Local EID must be MCTP_ADDR_NULL or MCTP_ADDR_ANY in current
88 * kernels.
89 */
90 unsigned int net;
91 mctp_eid_t peer_addr;
92 mctp_eid_t local_addr;
93
94 /* Set by caller, but no flags defined currently. Must be 0 */
95 __u16 flags;
96
97 /* For SIOCMCTPALLOCTAG2: must be passed as zero, kernel will
98 * populate with the allocated tag value. Returned tag value will
99 * always have TO and PREALLOC set.
100 *
101 * For SIOCMCTPDROPTAG2: userspace provides tag value to drop, from
102 * a prior SIOCMCTPALLOCTAG2 call (and so must have TO and PREALLOC set).
103 */
104 __u8 tag;
105
106};
107
108#endif /* __UAPI_MCTP_H */