The C and C++ Include Header Files

/usr/include/linux/vsockmon.h


$ cat -n /usr/include/linux/vsockmon.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _VSOCKMON_H
     3	#define _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