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VSOCK: Add vsockmon device

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Add vsockmon virtual network device that receives packets from the vsock
transports and exposes them to user space.

Based on the nlmon device.

Signed-off-by: Gerard Garcia <ggarcia@deic.uab.cat>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerard Garcia 2017-04-21 10:10:45 +01:00 • committed by David S. Miller
parent 531b374834
commit 0b2e66448b
6 changed files with 242 additions and 0 deletions
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60
include/uapi/linux/vsockmon.h Normal file
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#ifndef _UAPI_VSOCKMON_H
#define _UAPI_VSOCKMON_H
#include <linux/virtio_vsock.h>
/*
* vsockmon is the AF_VSOCK packet capture device. Packets captured have the
* following layout:
*
* +-----------------------------------+
* | vsockmon header |
* | (struct af_vsockmon_hdr) |
* +-----------------------------------+
* | transport header |
* | (af_vsockmon_hdr->len bytes long) |
* +-----------------------------------+
* | payload |
* | (until end of packet) |
* +-----------------------------------+
*
* The vsockmon header is a transport-independent description of the packet.
* It duplicates some of the information from the transport header so that
* no transport-specific knowledge is necessary to process packets.
*
* The transport header is useful for low-level transport-specific packet
* analysis. Transport type is given in af_vsockmon_hdr->transport and
* transport header length is given in af_vsockmon_hdr->len.
*
* If af_vsockmon_hdr->op is AF_VSOCK_OP_PAYLOAD then the payload follows the
* transport header. Other ops do not have a payload.
*/
struct af_vsockmon_hdr {
__le64 src_cid;
__le64 dst_cid;
__le32 src_port;
__le32 dst_port;
__le16 op; /* enum af_vsockmon_op */
__le16 transport; /* enum af_vsockmon_transport */
__le16 len; /* Transport header length */
__u8 reserved[2];
};
enum af_vsockmon_op {
AF_VSOCK_OP_UNKNOWN = 0,
AF_VSOCK_OP_CONNECT = 1,
AF_VSOCK_OP_DISCONNECT = 2,
AF_VSOCK_OP_CONTROL = 3,
AF_VSOCK_OP_PAYLOAD = 4,
};
enum af_vsockmon_transport {
AF_VSOCK_TRANSPORT_UNKNOWN = 0,
AF_VSOCK_TRANSPORT_NO_INFO = 1, /* No transport information */
/* Transport header type: struct virtio_vsock_hdr */
AF_VSOCK_TRANSPORT_VIRTIO = 2,
};
#endif