1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _UAPI_VSOCKMON_H
3 #define _UAPI_VSOCKMON_H
4 
5 #include <linux/virtio_vsock.h>
6 
7 /*
8  * vsockmon is the AF_VSOCK packet capture device.  Packets captured have the
9  * following layout:
10  *
11  *   +-----------------------------------+
12  *   |           vsockmon header         |
13  *   |      (struct af_vsockmon_hdr)     |
14  *   +-----------------------------------+
15  *   |          transport header         |
16  *   | (af_vsockmon_hdr->len bytes long) |
17  *   +-----------------------------------+
18  *   |              payload              |
19  *   |       (until end of packet)       |
20  *   +-----------------------------------+
21  *
22  * The vsockmon header is a transport-independent description of the packet.
23  * It duplicates some of the information from the transport header so that
24  * no transport-specific knowledge is necessary to process packets.
25  *
26  * The transport header is useful for low-level transport-specific packet
27  * analysis.  Transport type is given in af_vsockmon_hdr->transport and
28  * transport header length is given in af_vsockmon_hdr->len.
29  *
30  * If af_vsockmon_hdr->op is AF_VSOCK_OP_PAYLOAD then the payload follows the
31  * transport header.  Other ops do not have a payload.
32  */
33 
34 struct af_vsockmon_hdr {
35 	__le64 src_cid;
36 	__le64 dst_cid;
37 	__le32 src_port;
38 	__le32 dst_port;
39 	__le16 op;			/* enum af_vsockmon_op */
40 	__le16 transport;		/* enum af_vsockmon_transport */
41 	__le16 len;			/* Transport header length */
42 	__u8 reserved[2];
43 };
44 
45 enum af_vsockmon_op {
46 	AF_VSOCK_OP_UNKNOWN = 0,
47 	AF_VSOCK_OP_CONNECT = 1,
48 	AF_VSOCK_OP_DISCONNECT = 2,
49 	AF_VSOCK_OP_CONTROL = 3,
50 	AF_VSOCK_OP_PAYLOAD = 4,
51 };
52 
53 enum af_vsockmon_transport {
54 	AF_VSOCK_TRANSPORT_UNKNOWN = 0,
55 	AF_VSOCK_TRANSPORT_NO_INFO = 1,	/* No transport information */
56 
57 	/* Transport header type: struct virtio_vsock_hdr */
58 	AF_VSOCK_TRANSPORT_VIRTIO = 2,
59 };
60 
61 #endif
62