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