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-rw-r--r--include/uapi/linux/vsockmon.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/include/uapi/linux/vsockmon.h b/include/uapi/linux/vsockmon.h
new file mode 100644
index 000000000..4a03b893a
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+++ b/include/uapi/linux/vsockmon.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#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