uapi/linux/vsockmon.h

0001 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
0002 #ifndef _UAPI_VSOCKMON_H
0003 #define _UAPI_VSOCKMON_H
0004
0005 #include <linux/virtio_vsock.h>
0006
0007 /*
0008  * vsockmon is the AF_VSOCK packet capture device.  Packets captured have the
0009  * following layout:
0010  *
0011  *   +-----------------------------------+
0012  *   |           vsockmon header         |
0013  *   |      (struct af_vsockmon_hdr)     |
0014  *   +-----------------------------------+
0015  *   |          transport header         |
0016  *   | (af_vsockmon_hdr->len bytes long) |
0017  *   +-----------------------------------+
0018  *   |              payload              |
0019  *   |       (until end of packet)       |
0020  *   +-----------------------------------+
0021  *
0022  * The vsockmon header is a transport-independent description of the packet.
0023  * It duplicates some of the information from the transport header so that
0024  * no transport-specific knowledge is necessary to process packets.
0025  *
0026  * The transport header is useful for low-level transport-specific packet
0027  * analysis.  Transport type is given in af_vsockmon_hdr->transport and
0028  * transport header length is given in af_vsockmon_hdr->len.
0029  *
0030  * If af_vsockmon_hdr->op is AF_VSOCK_OP_PAYLOAD then the payload follows the
0031  * transport header.  Other ops do not have a payload.
0032  */
0033
0034 struct af_vsockmon_hdr {
0035     __le64 src_cid;
0036     __le64 dst_cid;
0037     __le32 src_port;
0038     __le32 dst_port;
0039     __le16 op;          /* enum af_vsockmon_op */
0040     __le16 transport;       /* enum af_vsockmon_transport */
0041     __le16 len;         /* Transport header length */
0042     __u8 reserved[2];
0043 };
0044
0045 enum af_vsockmon_op {
0046     AF_VSOCK_OP_UNKNOWN = 0,
0047     AF_VSOCK_OP_CONNECT = 1,
0048     AF_VSOCK_OP_DISCONNECT = 2,
0049     AF_VSOCK_OP_CONTROL = 3,
0050     AF_VSOCK_OP_PAYLOAD = 4,
0051 };
0052
0053 enum af_vsockmon_transport {
0054     AF_VSOCK_TRANSPORT_UNKNOWN = 0,
0055     AF_VSOCK_TRANSPORT_NO_INFO = 1, /* No transport information */
0056
0057     /* Transport header type: struct virtio_vsock_hdr */
0058     AF_VSOCK_TRANSPORT_VIRTIO = 2,
0059 };
0060
0061 #endif