1 files changed, 100 insertions, 0 deletions
diff --git a/include/uapi/linux/mctp.h b/include/uapi/linux/mctp.h
new file mode 100644
index 000000000000..e1db65df9359
--- /dev/null
+++ b/include/uapi/linux/mctp.h
@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Management Component Transport Protocol (MCTP)
+ *
+ * Copyright (c) 2021 Code Construct
+ * Copyright (c) 2021 Google
+ */
+
+#ifndef __UAPI_MCTP_H
+#define __UAPI_MCTP_H
+
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/netdevice.h>
+
+typedef __u8			mctp_eid_t;
+
+struct mctp_addr {
+	mctp_eid_t		s_addr;
+};
+
+struct sockaddr_mctp {
+	__kernel_sa_family_t	smctp_family;
+	__u16			__smctp_pad0;
+	unsigned int		smctp_network;
+	struct mctp_addr	smctp_addr;
+	__u8			smctp_type;
+	__u8			smctp_tag;
+	__u8			__smctp_pad1;
+};
+
+struct sockaddr_mctp_ext {
+	struct sockaddr_mctp	smctp_base;
+	int			smctp_ifindex;
+	__u8			smctp_halen;
+	__u8			__smctp_pad0[3];
+	__u8			smctp_haddr[MAX_ADDR_LEN];
+};
+
+#define MCTP_NET_ANY		0x0
+
+#define MCTP_ADDR_NULL		0x00
+#define MCTP_ADDR_ANY		0xff
+
+#define MCTP_TAG_MASK		0x07
+#define MCTP_TAG_OWNER		0x08
+#define MCTP_TAG_PREALLOC	0x10
+
+#define MCTP_OPT_ADDR_EXT	1
+
+#define SIOCMCTPALLOCTAG	(SIOCPROTOPRIVATE + 0)
+#define SIOCMCTPDROPTAG		(SIOCPROTOPRIVATE + 1)
+#define SIOCMCTPALLOCTAG2	(SIOCPROTOPRIVATE + 2)
+#define SIOCMCTPDROPTAG2	(SIOCPROTOPRIVATE + 3)
+
+/* Deprecated: use mctp_ioc_tag_ctl2 / TAG2 ioctls instead, which defines the
+ * MCTP network ID as part of the allocated tag. Using this assumes the default
+ * net ID for allocated tags, which may not give correct behaviour on system
+ * with multiple networks configured.
+ */
+struct mctp_ioc_tag_ctl {
+	mctp_eid_t	peer_addr;
+
+	/* For SIOCMCTPALLOCTAG: must be passed as zero, kernel will
+	 * populate with the allocated tag value. Returned tag value will
+	 * always have TO and PREALLOC set.
+	 *
+	 * For SIOCMCTPDROPTAG: userspace provides tag value to drop, from
+	 * a prior SIOCMCTPALLOCTAG call (and so must have TO and PREALLOC set).
+	 */
+	__u8		tag;
+	__u16		flags;
+};
+
+struct mctp_ioc_tag_ctl2 {
+	/* Peer details: network ID, peer EID, local EID. All set by the
+	 * caller.
+	 *
+	 * Local EID must be MCTP_ADDR_NULL or MCTP_ADDR_ANY in current
+	 * kernels.
+	 */
+	unsigned int	net;
+	mctp_eid_t	peer_addr;
+	mctp_eid_t	local_addr;
+
+	/* Set by caller, but no flags defined currently. Must be 0 */
+	__u16		flags;
+
+	/* For SIOCMCTPALLOCTAG2: must be passed as zero, kernel will
+	 * populate with the allocated tag value. Returned tag value will
+	 * always have TO and PREALLOC set.
+	 *
+	 * For SIOCMCTPDROPTAG2: userspace provides tag value to drop, from
+	 * a prior SIOCMCTPALLOCTAG2 call (and so must have TO and PREALLOC set).
+	 */
+	__u8		tag;
+
+};
+
+#endif /* __UAPI_MCTP_H */