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|
//! This module defines the socket device protocol according to the virtio spec v1.1 5.10 Socket Device
use super::error::{self, SocketError};
use crate::volatile::ReadOnly;
use bitflags::bitflags;
use core::{
convert::{TryFrom, TryInto},
fmt,
};
use zerocopy::{
byteorder::{LittleEndian, U16, U32, U64},
AsBytes, FromBytes,
};
/// Well-known CID for the host.
pub const VMADDR_CID_HOST: u64 = 2;
/// Currently only stream sockets are supported. type is 1 for stream socket types.
#[derive(Copy, Clone, Debug)]
#[repr(u16)]
pub enum SocketType {
/// Stream sockets provide in-order, guaranteed, connection-oriented delivery without message boundaries.
Stream = 1,
/// seqpacket socket type introduced in virtio-v1.2.
SeqPacket = 2,
}
impl From<SocketType> for U16<LittleEndian> {
fn from(socket_type: SocketType) -> Self {
(socket_type as u16).into()
}
}
/// VirtioVsockConfig is the vsock device configuration space.
#[repr(C)]
pub struct VirtioVsockConfig {
/// The guest_cid field contains the guest’s context ID, which uniquely identifies
/// the device for its lifetime. The upper 32 bits of the CID are reserved and zeroed.
///
/// According to virtio spec v1.1 2.4.1 Driver Requirements: Device Configuration Space,
/// drivers MUST NOT assume reads from fields greater than 32 bits wide are atomic.
/// So we need to split the u64 guest_cid into two parts.
pub guest_cid_low: ReadOnly<u32>,
pub guest_cid_high: ReadOnly<u32>,
}
/// The message header for data packets sent on the tx/rx queues
#[repr(packed)]
#[derive(AsBytes, Clone, Copy, Debug, Eq, FromBytes, PartialEq)]
pub struct VirtioVsockHdr {
pub src_cid: U64<LittleEndian>,
pub dst_cid: U64<LittleEndian>,
pub src_port: U32<LittleEndian>,
pub dst_port: U32<LittleEndian>,
pub len: U32<LittleEndian>,
pub socket_type: U16<LittleEndian>,
pub op: U16<LittleEndian>,
pub flags: U32<LittleEndian>,
/// Total receive buffer space for this socket. This includes both free and in-use buffers.
pub buf_alloc: U32<LittleEndian>,
/// Free-running bytes received counter.
pub fwd_cnt: U32<LittleEndian>,
}
impl Default for VirtioVsockHdr {
fn default() -> Self {
Self {
src_cid: 0.into(),
dst_cid: 0.into(),
src_port: 0.into(),
dst_port: 0.into(),
len: 0.into(),
socket_type: SocketType::Stream.into(),
op: 0.into(),
flags: 0.into(),
buf_alloc: 0.into(),
fwd_cnt: 0.into(),
}
}
}
impl VirtioVsockHdr {
/// Returns the length of the data.
pub fn len(&self) -> u32 {
u32::from(self.len)
}
pub fn op(&self) -> error::Result<VirtioVsockOp> {
self.op.try_into()
}
pub fn source(&self) -> VsockAddr {
VsockAddr {
cid: self.src_cid.get(),
port: self.src_port.get(),
}
}
pub fn destination(&self) -> VsockAddr {
VsockAddr {
cid: self.dst_cid.get(),
port: self.dst_port.get(),
}
}
pub fn check_data_is_empty(&self) -> error::Result<()> {
if self.len() == 0 {
Ok(())
} else {
Err(SocketError::UnexpectedDataInPacket)
}
}
}
/// Socket address.
#[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
pub struct VsockAddr {
/// Context Identifier.
pub cid: u64,
/// Port number.
pub port: u32,
}
/// An event sent to the event queue
#[derive(Copy, Clone, Debug, Default, AsBytes, FromBytes)]
#[repr(C)]
pub struct VirtioVsockEvent {
// ID from the virtio_vsock_event_id struct in the virtio spec
pub id: U32<LittleEndian>,
}
#[derive(Copy, Clone, Eq, PartialEq)]
#[repr(u16)]
pub enum VirtioVsockOp {
Invalid = 0,
/* Connect operations */
Request = 1,
Response = 2,
Rst = 3,
Shutdown = 4,
/* To send payload */
Rw = 5,
/* Tell the peer our credit info */
CreditUpdate = 6,
/* Request the peer to send the credit info to us */
CreditRequest = 7,
}
impl From<VirtioVsockOp> for U16<LittleEndian> {
fn from(op: VirtioVsockOp) -> Self {
(op as u16).into()
}
}
impl TryFrom<U16<LittleEndian>> for VirtioVsockOp {
type Error = SocketError;
fn try_from(v: U16<LittleEndian>) -> Result<Self, Self::Error> {
let op = match u16::from(v) {
0 => Self::Invalid,
1 => Self::Request,
2 => Self::Response,
3 => Self::Rst,
4 => Self::Shutdown,
5 => Self::Rw,
6 => Self::CreditUpdate,
7 => Self::CreditRequest,
_ => return Err(SocketError::UnknownOperation(v.into())),
};
Ok(op)
}
}
impl fmt::Debug for VirtioVsockOp {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Self::Invalid => write!(f, "VIRTIO_VSOCK_OP_INVALID"),
Self::Request => write!(f, "VIRTIO_VSOCK_OP_REQUEST"),
Self::Response => write!(f, "VIRTIO_VSOCK_OP_RESPONSE"),
Self::Rst => write!(f, "VIRTIO_VSOCK_OP_RST"),
Self::Shutdown => write!(f, "VIRTIO_VSOCK_OP_SHUTDOWN"),
Self::Rw => write!(f, "VIRTIO_VSOCK_OP_RW"),
Self::CreditUpdate => write!(f, "VIRTIO_VSOCK_OP_CREDIT_UPDATE"),
Self::CreditRequest => write!(f, "VIRTIO_VSOCK_OP_CREDIT_REQUEST"),
}
}
}
bitflags! {
#[derive(Copy, Clone, Debug, Default, Eq, PartialEq)]
pub(crate) struct Feature: u64 {
/// stream socket type is supported.
const STREAM = 1 << 0;
/// seqpacket socket type is supported.
const SEQ_PACKET = 1 << 1;
// device independent
const NOTIFY_ON_EMPTY = 1 << 24; // legacy
const ANY_LAYOUT = 1 << 27; // legacy
const RING_INDIRECT_DESC = 1 << 28;
const RING_EVENT_IDX = 1 << 29;
const UNUSED = 1 << 30; // legacy
const VERSION_1 = 1 << 32; // detect legacy
// since virtio v1.1
const ACCESS_PLATFORM = 1 << 33;
const RING_PACKED = 1 << 34;
const IN_ORDER = 1 << 35;
const ORDER_PLATFORM = 1 << 36;
const SR_IOV = 1 << 37;
const NOTIFICATION_DATA = 1 << 38;
}
}
|
