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Add syscall sendmsg and recvmsg

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This commit is contained in:
Jianfeng Jiang
2024-03-20 03:25:18 +00:00
committed by Tate, Hongliang Tian
parent c5d0099dfd
commit cb5b996274
26 changed files with 851 additions and 186 deletions
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4
docs/src/kernel/linux-compatibility.md
View File

@ -66,8 +66,8 @@ provided by Linux on x86-64 architecture.
| 43 | accept | ✅ |
| 44 | sendto | ✅ |
| 45 | recvfrom | ✅ |
| 46 | sendmsg | ❌ |
| 47 | recvmsg | ❌ |
| 46 | sendmsg | ✅ |
| 47 | recvmsg | ✅ |
| 48 | shutdown | ✅ |
| 49 | bind | ✅ |
| 50 | listen | ✅ |

13
kernel/aster-nix/src/net/socket/ip/datagram/bound.rs
View File

@ -39,11 +39,7 @@ impl BoundDatagram {
self.remote_endpoint = Some(*endpoint)
}
pub fn try_recvfrom(
&self,
buf: &mut [u8],
flags: SendRecvFlags,
) -> Result<(usize, IpEndpoint)> {
pub fn try_recv(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, IpEndpoint)> {
let result = self
.bound_socket
.raw_with(|socket: &mut RawUdpSocket| socket.recv_slice(buf));
@ -55,12 +51,7 @@ impl BoundDatagram {
}
}
pub fn try_sendto(
&self,
buf: &[u8],
remote: &IpEndpoint,
flags: SendRecvFlags,
) -> Result<usize> {
pub fn try_send(&self, buf: &[u8], remote: &IpEndpoint, flags: SendRecvFlags) -> Result<usize> {
let result = self.bound_socket.raw_with(|socket: &mut RawUdpSocket| {
if socket.payload_send_capacity() < buf.len() {
return None;

97
kernel/aster-nix/src/net/socket/ip/datagram/mod.rs
View File

@ -15,12 +15,16 @@ use crate::{
iface::IpEndpoint,
poll_ifaces,
socket::{
util::{send_recv_flags::SendRecvFlags, socket_addr::SocketAddr},
util::{
copy_message_from_user, copy_message_to_user, create_message_buffer,
send_recv_flags::SendRecvFlags, socket_addr::SocketAddr, MessageHeader,
},
Socket,
},
},
prelude::*,
process::signal::{Pollee, Poller},
util::IoVec,
};
mod bound;
@ -120,16 +124,15 @@ impl DatagramSocket {
})
}
fn try_recvfrom(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
fn try_recv(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
let inner = self.inner.read();
let Inner::Bound(bound_datagram) = inner.as_ref() else {
return_errno_with_message!(Errno::EAGAIN, "the socket is not bound");
};
let received =
bound_datagram
.try_recvfrom(buf, flags)
let received = bound_datagram
.try_recv(buf, flags)
.map(|(recv_bytes, remote_endpoint)| {
bound_datagram.update_io_events(&self.pollee);
(recv_bytes, remote_endpoint.into())
@ -141,7 +144,15 @@ impl DatagramSocket {
received
}
fn try_sendto(&self, buf: &[u8], remote: &IpEndpoint, flags: SendRecvFlags) -> Result<usize> {
fn recv(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
if self.is_nonblocking() {
self.try_recv(buf, flags)
} else {
self.wait_events(IoEvents::IN, || self.try_recv(buf, flags))
}
}
fn try_send(&self, buf: &[u8], remote: &IpEndpoint, flags: SendRecvFlags) -> Result<usize> {
let inner = self.inner.read();
let Inner::Bound(bound_datagram) = inner.as_ref() else {
@ -149,7 +160,7 @@ impl DatagramSocket {
};
let sent_bytes = bound_datagram
.try_sendto(buf, remote, flags)
.try_send(buf, remote, flags)
.map(|sent_bytes| {
bound_datagram.update_io_events(&self.pollee);
sent_bytes
@ -194,16 +205,24 @@ impl DatagramSocket {
impl FileLike for DatagramSocket {
fn read(&self, buf: &mut [u8]) -> Result<usize> {
// FIXME: respect flags
// TODO: set correct flags
let flags = SendRecvFlags::empty();
let (recv_len, _) = self.recvfrom(buf, flags)?;
Ok(recv_len)
self.recv(buf, flags).map(|(len, _)| len)
}
fn write(&self, buf: &[u8]) -> Result<usize> {
// FIXME: set correct flags
let remote = self.remote_endpoint().ok_or_else(|| {
Error::with_message(
Errno::EDESTADDRREQ,
"the destination address is not specified",
)
})?;
// TODO: Set correct flags
let flags = SendRecvFlags::empty();
self.sendto(buf, None, flags)
// TODO: Block if send buffer is full
self.try_send(buf, &remote, flags)
}
fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
@ -293,26 +312,21 @@ impl Socket for DatagramSocket {
.ok_or_else(|| Error::with_message(Errno::ENOTCONN, "the socket is not connected"))
}
// FIXME: respect RecvFromFlags
fn recvfrom(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
debug_assert!(flags.is_all_supported());
if self.is_nonblocking() {
self.try_recvfrom(buf, flags)
} else {
self.wait_events(IoEvents::IN, || self.try_recvfrom(buf, flags))
}
}
fn sendto(
fn sendmsg(
&self,
buf: &[u8],
remote: Option<SocketAddr>,
io_vecs: &[IoVec],
message_header: MessageHeader,
flags: SendRecvFlags,
) -> Result<usize> {
// TODO: Deal with flags
debug_assert!(flags.is_all_supported());
let remote_endpoint = match remote {
let MessageHeader {
addr,
control_message,
} = message_header;
let remote_endpoint = match addr {
Some(remote_addr) => {
let endpoint = remote_addr.try_into()?;
self.try_bind_empheral(&endpoint)?;
@ -326,8 +340,35 @@ impl Socket for DatagramSocket {
})?,
};
if control_message.is_some() {
// TODO: Support sending control message
warn!("sending control message is not supported");
}
let buf = copy_message_from_user(io_vecs);
// TODO: Block if the send buffer is full
self.try_sendto(buf, &remote_endpoint, flags)
self.try_send(&buf, &remote_endpoint, flags)
}
fn recvmsg(&self, io_vecs: &[IoVec], flags: SendRecvFlags) -> Result<(usize, MessageHeader)> {
// TODO: Deal with flags
debug_assert!(flags.is_all_supported());
let mut buf = create_message_buffer(io_vecs);
let (received_bytes, peer_addr) = self.recv(&mut buf, flags)?;
let copied_bytes = {
let message = &buf[..received_bytes];
copy_message_to_user(io_vecs, message)
};
// TODO: Receive control message
let message_header = MessageHeader::new(Some(peer_addr), None);
Ok((copied_bytes, message_header))
}
}

6
kernel/aster-nix/src/net/socket/ip/stream/connected.rs
View File

@ -53,10 +53,11 @@ impl ConnectedStream {
Ok(())
}
pub fn try_recvfrom(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<usize> {
pub fn try_recv(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<usize> {
let result = self
.bound_socket
.raw_with(|socket: &mut RawTcpSocket| socket.recv_slice(buf));
match result {
Ok(0) => return_errno_with_message!(Errno::EAGAIN, "the receive buffer is empty"),
Ok(recv_bytes) => Ok(recv_bytes),
@ -67,10 +68,11 @@ impl ConnectedStream {
}
}
pub fn try_sendto(&self, buf: &[u8], flags: SendRecvFlags) -> Result<usize> {
pub fn try_send(&self, buf: &[u8], flags: SendRecvFlags) -> Result<usize> {
let result = self
.bound_socket
.raw_with(|socket: &mut RawTcpSocket| socket.send_slice(buf));
match result {
Ok(0) => return_errno_with_message!(Errno::EAGAIN, "the send buffer is full"),
Ok(sent_bytes) => Ok(sent_bytes),

90
kernel/aster-nix/src/net/socket/ip/stream/mod.rs
View File

@ -25,16 +25,19 @@ use crate::{
Error as SocketError, Linger, RecvBuf, ReuseAddr, ReusePort, SendBuf, SocketOption,
},
util::{
copy_message_from_user, copy_message_to_user, create_message_buffer,
options::{SocketOptionSet, MIN_RECVBUF, MIN_SENDBUF},
send_recv_flags::SendRecvFlags,
shutdown_cmd::SockShutdownCmd,
socket_addr::SocketAddr,
MessageHeader,
},
Socket,
},
},
prelude::*,
process::signal::{Pollee, Poller},
util::IoVec,
};
mod connected;
@ -249,7 +252,7 @@ impl StreamSocket {
accepted
}
fn try_recvfrom(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
fn try_recv(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
let state = self.state.read();
let connected_stream = match state.as_ref() {
@ -262,7 +265,7 @@ impl StreamSocket {
}
};
let received = connected_stream.try_recvfrom(buf, flags).map(|recv_bytes| {
let received = connected_stream.try_recv(buf, flags).map(|recv_bytes| {
connected_stream.update_io_events(&self.pollee);
let remote_endpoint = connected_stream.remote_endpoint();
@ -275,7 +278,15 @@ impl StreamSocket {
received
}
fn try_sendto(&self, buf: &[u8], flags: SendRecvFlags) -> Result<usize> {
fn recv(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
if self.is_nonblocking() {
self.try_recv(buf, flags)
} else {
self.wait_events(IoEvents::IN, || self.try_recv(buf, flags))
}
}
fn try_send(&self, buf: &[u8], flags: SendRecvFlags) -> Result<usize> {
let state = self.state.read();
let connected_stream = match state.as_ref() {
@ -291,7 +302,7 @@ impl StreamSocket {
}
};
let sent_bytes = connected_stream.try_sendto(buf, flags).map(|sent_bytes| {
let sent_bytes = connected_stream.try_send(buf, flags).map(|sent_bytes| {
connected_stream.update_io_events(&self.pollee);
sent_bytes
});
@ -302,6 +313,14 @@ impl StreamSocket {
sent_bytes
}
fn send(&self, buf: &[u8], flags: SendRecvFlags) -> Result<usize> {
if self.is_nonblocking() {
self.try_send(buf, flags)
} else {
self.wait_events(IoEvents::OUT, || self.try_send(buf, flags))
}
}
// TODO: Support timeout
fn wait_events<F, R>(&self, mask: IoEvents, mut cond: F) -> Result<R>
where
@ -344,16 +363,15 @@ impl StreamSocket {
impl FileLike for StreamSocket {
fn read(&self, buf: &mut [u8]) -> Result<usize> {
// FIXME: set correct flags
// TODO: Set correct flags
let flags = SendRecvFlags::empty();
let (recv_len, _) = self.recvfrom(buf, flags)?;
Ok(recv_len)
self.recv(buf, flags).map(|(len, _)| len)
}
fn write(&self, buf: &[u8]) -> Result<usize> {
// FIXME: set correct flags
// TODO: Set correct flags
let flags = SendRecvFlags::empty();
self.sendto(buf, None, flags)
self.send(buf, flags)
}
fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
@ -510,33 +528,53 @@ impl Socket for StreamSocket {
Ok(remote_endpoint.into())
}
fn recvfrom(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
debug_assert!(flags.is_all_supported());
if self.is_nonblocking() {
self.try_recvfrom(buf, flags)
} else {
self.wait_events(IoEvents::IN, || self.try_recvfrom(buf, flags))
}
}
fn sendto(
fn sendmsg(
&self,
buf: &[u8],
remote: Option<SocketAddr>,
io_vecs: &[IoVec],
message_header: MessageHeader,
flags: SendRecvFlags,
) -> Result<usize> {
// TODO: Deal with flags
debug_assert!(flags.is_all_supported());
let MessageHeader {
control_message, ..
} = message_header;
// According to the Linux man pages, `EISCONN` _may_ be returned when the destination
// address is specified for a connection-mode socket. In practice, the destination address
// is simply ignored. We follow the same behavior as the Linux implementation to ignore it.
if self.is_nonblocking() {
self.try_sendto(buf, flags)
} else {
self.wait_events(IoEvents::OUT, || self.try_sendto(buf, flags))
if control_message.is_some() {
// TODO: Support sending control message
warn!("sending control message is not supported");
}
let buf = copy_message_from_user(io_vecs);
self.send(&buf, flags)
}
fn recvmsg(&self, io_vecs: &[IoVec], flags: SendRecvFlags) -> Result<(usize, MessageHeader)> {
// TODO: Deal with flags
debug_assert!(flags.is_all_supported());
let mut buf = create_message_buffer(io_vecs);
let (received_bytes, _) = self.recv(&mut buf, flags)?;
let copied_bytes = {
let message = &buf[..received_bytes];
copy_message_to_user(io_vecs, message)
};
// TODO: Receive control message
// According to <https://elixir.bootlin.com/linux/v6.0.9/source/net/ipv4/tcp.c#L2645>,
// peer address is ignored for connected socket.
let message_header = MessageHeader::new(None, None);
Ok((copied_bytes, message_header))
}
fn get_option(&self, option: &mut dyn SocketOption) -> Result<()> {

28
kernel/aster-nix/src/net/socket/mod.rs
View File

@ -5,9 +5,9 @@
use self::options::SocketOption;
pub use self::util::{
options::LingerOption, send_recv_flags::SendRecvFlags, shutdown_cmd::SockShutdownCmd,
socket_addr::SocketAddr,
socket_addr::SocketAddr, MessageHeader,
};
use crate::{fs::file_handle::FileLike, prelude::*};
use crate::{fs::file_handle::FileLike, prelude::*, util::IoVec};
pub mod ip;
pub mod options;
@ -63,18 +63,18 @@ pub trait Socket: FileLike + Send + Sync {
return_errno_with_message!(Errno::EOPNOTSUPP, "setsockopt() is not supported");
}
/// Receive a message from a socket
fn recvfrom(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
return_errno_with_message!(Errno::EOPNOTSUPP, "recvfrom() is not supported");
}
/// Send a message on a socket
fn sendto(
/// Sends a message on a socket.
fn sendmsg(
&self,
buf: &[u8],
remote: Option<SocketAddr>,
io_vecs: &[IoVec],
message_header: MessageHeader,
flags: SendRecvFlags,
) -> Result<usize> {
return_errno_with_message!(Errno::EOPNOTSUPP, "sendto() is not supported");
}
) -> Result<usize>;
/// Receives a message from a socket.
///
/// If successful, the `io_vecs` buffer will be filled with the received content.
/// This method returns the length of the received message,
/// and the message header.
fn recvmsg(&self, io_vecs: &[IoVec], flags: SendRecvFlags) -> Result<(usize, MessageHeader)>;
}

88
kernel/aster-nix/src/net/socket/unix/stream/socket.rs
View File

@ -19,11 +19,15 @@ use crate::{
},
net::socket::{
unix::{addr::UnixSocketAddrBound, UnixSocketAddr},
util::{send_recv_flags::SendRecvFlags, socket_addr::SocketAddr},
util::{
copy_message_from_user, copy_message_to_user, create_message_buffer,
send_recv_flags::SendRecvFlags, socket_addr::SocketAddr, MessageHeader,
},
SockShutdownCmd, Socket,
},
prelude::*,
process::signal::Poller,
util::IoVec,
};
pub struct UnixStreamSocket(RwLock<State>);
@ -86,6 +90,24 @@ impl UnixStreamSocket {
status_flags.intersection(SUPPORTED_FLAGS)
}
fn send(&self, buf: &[u8], flags: SendRecvFlags) -> Result<usize> {
let connected = match &*self.0.read() {
State::Connected(connected) => connected.clone(),
_ => return_errno_with_message!(Errno::ENOTCONN, "the socket is not connected"),
};
connected.write(buf)
}
fn recv(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<usize> {
let connected = match &*self.0.read() {
State::Connected(connected) => connected.clone(),
_ => return_errno_with_message!(Errno::ENOTCONN, "the socket is not connected"),
};
connected.read(buf)
}
}
impl FileLike for UnixStreamSocket {
@ -94,12 +116,15 @@ impl FileLike for UnixStreamSocket {
}
fn read(&self, buf: &mut [u8]) -> Result<usize> {
self.recvfrom(buf, SendRecvFlags::empty())
.map(|(read_size, _)| read_size)
// TODO: Set correct flags
let flags = SendRecvFlags::empty();
self.recv(buf, flags)
}
fn write(&self, buf: &[u8]) -> Result<usize> {
self.sendto(buf, None, SendRecvFlags::empty())
// TODO: Set correct flags
let flags = SendRecvFlags::empty();
self.send(buf, flags)
}
fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
@ -251,31 +276,46 @@ impl Socket for UnixStreamSocket {
}
}
fn recvfrom(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
let connected = match &*self.0.read() {
State::Connected(connected) => connected.clone(),
_ => return_errno_with_message!(Errno::ENOTCONN, "the socket is not connected"),
};
let peer_addr = self.peer_addr()?;
let read_size = connected.read(buf)?;
Ok((read_size, peer_addr))
}
fn sendto(
fn sendmsg(
&self,
buf: &[u8],
remote: Option<SocketAddr>,
io_vecs: &[IoVec],
message_header: MessageHeader,
flags: SendRecvFlags,
) -> Result<usize> {
debug_assert!(remote.is_none());
// TODO: deal with flags
let connected = match &*self.0.read() {
State::Connected(connected) => connected.clone(),
_ => return_errno_with_message!(Errno::ENOTCONN, "the socket is not connected"),
// TODO: Deal with flags
debug_assert!(flags.is_all_supported());
let MessageHeader {
control_message, ..
} = message_header;
if control_message.is_some() {
// TODO: Support sending control message
warn!("sending control message is not supported");
}
let buf = copy_message_from_user(io_vecs);
self.send(&buf, flags)
}
fn recvmsg(&self, io_vecs: &[IoVec], flags: SendRecvFlags) -> Result<(usize, MessageHeader)> {
// TODO: Deal with flags
debug_assert!(flags.is_all_supported());
let mut buf = create_message_buffer(io_vecs);
let received_bytes = self.recv(&mut buf, flags)?;
let copied_bytes = {
let message = &buf[..received_bytes];
copy_message_to_user(io_vecs, message)
};
connected.write(buf)
// TODO: Receive control message
let message_header = MessageHeader::new(None, None);
Ok((copied_bytes, message_header))
}
}

95
kernel/aster-nix/src/net/socket/util/message_header.rs Normal file
View File

@ -0,0 +1,95 @@
// SPDX-License-Identifier: MPL-2.0
use super::socket_addr::SocketAddr;
use crate::{prelude::*, util::IoVec};
/// Message header used for sendmsg/recvmsg.
#[derive(Debug)]
pub struct MessageHeader {
pub(in crate::net) addr: Option<SocketAddr>,
pub(in crate::net) control_message: Option<ControlMessage>,
}
impl MessageHeader {
/// Creates a new `MessageHeader`.
pub const fn new(addr: Option<SocketAddr>, control_message: Option<ControlMessage>) -> Self {
Self {
addr,
control_message,
}
}
/// Returns the socket address.
pub fn addr(&self) -> Option<&SocketAddr> {
self.addr.as_ref()
}
}
/// Control message carried by MessageHeader.
///
/// TODO: Implement the struct. The struct is empty now.
#[derive(Debug)]
pub struct ControlMessage;
/// Copies a message from user space.
///
/// Since udp allows sending and receiving packet of length 0,
/// The returned buffer may have length of zero.
pub fn copy_message_from_user(io_vecs: &[IoVec]) -> Box<[u8]> {
let mut buffer = create_message_buffer(io_vecs);
let mut total_bytes = 0;
for io_vec in io_vecs {
if io_vec.is_empty() {
continue;
}
let dst = &mut buffer[total_bytes..total_bytes + io_vec.len()];
// FIXME: short read should be allowed here
match io_vec.read_exact_from_user(dst) {
Ok(()) => total_bytes += io_vec.len(),
Err(e) => {
warn!("fails to copy message from user");
break;
}
}
}
buffer.truncate(total_bytes);
buffer.into_boxed_slice()
}
/// Creates a buffer whose length
/// is equal to the total length of `io_vecs`.
pub fn create_message_buffer(io_vecs: &[IoVec]) -> Vec<u8> {
let buffer_len: usize = io_vecs.iter().map(|iovec| iovec.len()).sum();
vec![0; buffer_len]
}
/// Copies a message to user space.
///
/// This method returns the actual copied length.
pub fn copy_message_to_user(io_vecs: &[IoVec], message: &[u8]) -> usize {
let mut total_bytes = 0;
for io_vec in io_vecs {
if io_vec.is_empty() {
continue;
}
let len = io_vec.len().min(message.len() - total_bytes);
if len == 0 {
break;
}
let src = &message[total_bytes..total_bytes + len];
match io_vec.write_to_user(src) {
Ok(len) => total_bytes += len,
Err(e) => {
warn!("fails to copy message to user");
break;
}
}
}
total_bytes
}

6
kernel/aster-nix/src/net/socket/util/mod.rs
View File

@ -1,6 +1,12 @@
// SPDX-License-Identifier: MPL-2.0
mod message_header;
pub mod options;
pub mod send_recv_flags;
pub mod shutdown_cmd;
pub mod socket_addr;
pub use message_header::MessageHeader;
pub(in crate::net) use message_header::{
copy_message_from_user, copy_message_to_user, create_message_buffer,
};

2
kernel/aster-nix/src/net/socket/util/socket_addr.rs
View File

@ -10,7 +10,7 @@ use crate::{
type PortNum = u16;
#[derive(Debug)]
#[derive(Debug, PartialEq, Eq)]
pub enum SocketAddr {
Unix(UnixSocketAddr),
IPv4(Ipv4Address, PortNum),

6
kernel/aster-nix/src/net/socket/vsock/stream/connected.rs
View File

@ -68,14 +68,14 @@ impl Connected {
}
}
pub fn send(&self, buf: &[u8], flags: SendRecvFlags) -> Result<usize> {
pub fn send(&self, packet: &[u8], flags: SendRecvFlags) -> Result<usize> {
let mut connection = self.connection.lock_irq_disabled();
debug_assert!(flags.is_all_supported());
let buf_len = buf.len();
let buf_len = packet.len();
VSOCK_GLOBAL
.get()
.unwrap()
.send(buf, &mut connection.info)?;
.send(packet, &mut connection.info)?;
Ok(buf_len)
}

92
kernel/aster-nix/src/net/socket/vsock/stream/socket.rs
View File

@ -9,11 +9,13 @@ use crate::{
events::IoEvents,
fs::{file_handle::FileLike, utils::StatusFlags},
net::socket::{
util::{copy_message_from_user, copy_message_to_user, create_message_buffer},
vsock::{addr::VsockSocketAddr, VSOCK_GLOBAL},
SendRecvFlags, SockShutdownCmd, Socket, SocketAddr,
MessageHeader, SendRecvFlags, SockShutdownCmd, Socket, SocketAddr,
},
prelude::*,
process::signal::Poller,
util::IoVec,
};
pub struct VsockStreamSocket {
@ -112,7 +114,17 @@ impl VsockStreamSocket {
Ok((socket, peer_addr.into()))
}
fn try_recvfrom(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
fn send(&self, buf: &[u8], flags: SendRecvFlags) -> Result<usize> {
let inner = self.status.read();
match &*inner {
Status::Connected(connected) => connected.send(buf, flags),
Status::Init(_) | Status::Listen(_) => {
return_errno_with_message!(Errno::EINVAL, "the socket is not connected");
}
}
}
fn try_recv(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
let connected = match &*self.status.read() {
Status::Connected(connected) => connected.clone(),
Status::Init(_) | Status::Listen(_) => {
@ -133,6 +145,14 @@ impl VsockStreamSocket {
}
Ok((read_size, peer_addr))
}
fn recv(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
if self.is_nonblocking() {
self.try_recv(buf, flags)
} else {
self.wait_events(IoEvents::IN, || self.try_recv(buf, flags))
}
}
}
impl FileLike for VsockStreamSocket {
@ -141,12 +161,15 @@ impl FileLike for VsockStreamSocket {
}
fn read(&self, buf: &mut [u8]) -> Result<usize> {
self.recvfrom(buf, SendRecvFlags::empty())
.map(|(read_size, _)| read_size)
// TODO: Set correct flags
let flags = SendRecvFlags::empty();
self.recv(buf, SendRecvFlags::empty()).map(|(len, _)| len)
}
fn write(&self, buf: &[u8]) -> Result<usize> {
self.sendto(buf, None, SendRecvFlags::empty())
// TODO: Set correct flags
let flags = SendRecvFlags::empty();
self.send(buf, flags)
}
fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
@ -219,7 +242,7 @@ impl Socket for VsockStreamSocket {
// Send request
vsockspace.request(&connecting.info()).unwrap();
// wait for response from driver
// TODO: add timeout
// TODO: Add timeout
let poller = Poller::new();
if !connecting
.poll(IoEvents::IN, Some(&poller))
@ -287,33 +310,46 @@ impl Socket for VsockStreamSocket {
}
}
fn recvfrom(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
debug_assert!(flags.is_all_supported());
if self.is_nonblocking() {
self.try_recvfrom(buf, flags)
} else {
self.wait_events(IoEvents::IN, || self.try_recvfrom(buf, flags))
}
}
fn sendto(
fn sendmsg(
&self,
buf: &[u8],
remote: Option<SocketAddr>,
io_vecs: &[IoVec],
message_header: MessageHeader,
flags: SendRecvFlags,
) -> Result<usize> {
debug_assert!(remote.is_none());
if remote.is_some() {
return_errno_with_message!(Errno::EINVAL, "vsock should not provide remote addr");
}
let inner = self.status.read();
match &*inner {
Status::Connected(connected) => connected.send(buf, flags),
Status::Init(_) | Status::Listen(_) => {
return_errno_with_message!(Errno::EINVAL, "the socket is not connected");
// TODO: Deal with flags
debug_assert!(flags.is_all_supported());
let MessageHeader {
control_message, ..
} = message_header;
if control_message.is_some() {
// TODO: Support sending control message
warn!("sending control message is not supported");
}
let buf = copy_message_from_user(io_vecs);
self.send(&buf, flags)
}
fn recvmsg(&self, io_vecs: &[IoVec], flags: SendRecvFlags) -> Result<(usize, MessageHeader)> {
// TODO: Deal with flags
debug_assert!(flags.is_all_supported());
let mut buf = create_message_buffer(io_vecs);
let (received_bytes, _) = self.recv(&mut buf, flags)?;
let copied_bytes = {
let message = &buf[..received_bytes];
copy_message_to_user(io_vecs, message)
};
// TODO: Receive control message
let messsge_header = MessageHeader::new(None, None);
Ok((copied_bytes, messsge_header))
}
fn addr(&self) -> Result<SocketAddr> {

4
kernel/aster-nix/src/syscall/arch/x86.rs
View File

@ -70,6 +70,7 @@ use crate::syscall::{
read::sys_read,
readlink::{sys_readlink, sys_readlinkat},
recvfrom::sys_recvfrom,
recvmsg::sys_recvmsg,
rename::{sys_rename, sys_renameat},
rmdir::sys_rmdir,
rt_sigaction::sys_rt_sigaction,
@ -81,6 +82,7 @@ use crate::syscall::{
sched_yield::sys_sched_yield,
select::sys_select,
sendfile::sys_sendfile,
sendmsg::sys_sendmsg,
sendto::sys_sendto,
set_get_priority::{sys_get_priority, sys_set_priority},
set_robust_list::sys_set_robust_list,
@ -161,6 +163,8 @@ impl_syscall_nums_and_dispatch_fn! {
SYS_ACCEPT = 43 => sys_accept(args[..3]);
SYS_SENDTO = 44 => sys_sendto(args[..6]);
SYS_RECVFROM = 45 => sys_recvfrom(args[..6]);
SYS_SENDMSG = 46 => sys_sendmsg(args[..3]);
SYS_RECVMSG = 47 => sys_recvmsg(args[..3]);
SYS_SHUTDOWN = 48 => sys_shutdown(args[..2]);
SYS_BIND = 49 => sys_bind(args[..3]);
SYS_LISTEN = 50 => sys_listen(args[..2]);

2
kernel/aster-nix/src/syscall/mod.rs
View File

@ -77,6 +77,7 @@ mod prlimit64;
mod read;
mod readlink;
mod recvfrom;
mod recvmsg;
mod rename;
mod rmdir;
mod rt_sigaction;
@ -88,6 +89,7 @@ mod sched_getaffinity;
mod sched_yield;
mod select;
mod sendfile;
mod sendmsg;
mod sendto;
mod set_get_priority;
mod set_robust_list;

16
kernel/aster-nix/src/syscall/recvfrom.rs
View File

@ -7,7 +7,7 @@ use crate::{
prelude::*,
util::{
net::{get_socket_from_fd, write_socket_addr_to_user},
write_bytes_to_user,
IoVec,
},
};
@ -24,14 +24,14 @@ pub fn sys_recvfrom(
let socket = get_socket_from_fd(sockfd)?;
let mut buffer = vec![0u8; len];
let io_vecs = [IoVec::new(buf, len)];
let (recv_size, message_header) = socket.recvmsg(&io_vecs, flags)?;
let (recv_size, socket_addr) = socket.recvfrom(&mut buffer, flags)?;
if buf != 0 {
write_bytes_to_user(buf, &buffer[..recv_size])?;
}
if src_addr != 0 {
write_socket_addr_to_user(&socket_addr, src_addr, addrlen_ptr)?;
if let Some(socket_addr) = message_header.addr()
&& src_addr != 0
{
write_socket_addr_to_user(socket_addr, src_addr, addrlen_ptr)?;
}
Ok(SyscallReturn::Return(recv_size as _))
}

38
kernel/aster-nix/src/syscall/recvmsg.rs Normal file
View File

@ -0,0 +1,38 @@
// SPDX-License-Identifier: MPL-2.0
use super::SyscallReturn;
use crate::{
fs::file_table::FileDesc,
net::socket::SendRecvFlags,
prelude::*,
util::{
net::{get_socket_from_fd, CUserMsgHdr},
read_val_from_user,
},
};
pub fn sys_recvmsg(sockfd: FileDesc, user_msghdr_ptr: Vaddr, flags: i32) -> Result<SyscallReturn> {
let c_user_msghdr: CUserMsgHdr = read_val_from_user(user_msghdr_ptr)?;
let flags = SendRecvFlags::from_bits_truncate(flags);
debug!(
"sockfd = {}, user_msghdr = {:x?}, flags = {:?}",
sockfd, c_user_msghdr, flags
);
let (total_bytes, message_header) = {
let socket = get_socket_from_fd(sockfd)?;
let io_vecs = c_user_msghdr.copy_iovs_from_user()?;
socket.recvmsg(&io_vecs, flags)?
};
if let Some(addr) = message_header.addr() {
c_user_msghdr.write_socket_addr_to_user(addr)?;
}
if c_user_msghdr.msg_control != 0 {
warn!("receiving control message is not supported");
}
Ok(SyscallReturn::Return(total_bytes as _))
}

43
kernel/aster-nix/src/syscall/sendmsg.rs Normal file
View File

@ -0,0 +1,43 @@
// SPDX-License-Identifier: MPL-2.0
use super::SyscallReturn;
use crate::{
fs::file_table::FileDesc,
net::socket::{MessageHeader, SendRecvFlags},
prelude::*,
util::{
net::{get_socket_from_fd, CUserMsgHdr},
read_val_from_user,
},
};
pub fn sys_sendmsg(sockfd: FileDesc, user_msghdr_ptr: Vaddr, flags: i32) -> Result<SyscallReturn> {
let c_user_msghdr: CUserMsgHdr = read_val_from_user(user_msghdr_ptr)?;
let flags = SendRecvFlags::from_bits_truncate(flags);
debug!(
"sockfd = {}, user_msghdr = {:x?}, flags = {:?}",
sockfd, c_user_msghdr, flags
);
let socket = get_socket_from_fd(sockfd)?;
let (io_vecs, message_header) = {
let addr = c_user_msghdr.read_socket_addr_from_user()?;
let io_vecs = c_user_msghdr.copy_iovs_from_user()?;
let control_message = {
if c_user_msghdr.msg_control != 0 {
// TODO: support sending control message
warn!("control message is not supported now");
}
None
};
(io_vecs, MessageHeader::new(addr, control_message))
};
let total_bytes = socket.sendmsg(&io_vecs, message_header, flags)?;
Ok(SyscallReturn::Return(total_bytes as _))
}

11
kernel/aster-nix/src/syscall/sendto.rs
View File

@ -3,11 +3,11 @@
use super::SyscallReturn;
use crate::{
fs::file_table::FileDesc,
net::socket::SendRecvFlags,
net::socket::{MessageHeader, SendRecvFlags},
prelude::*,
util::{
net::{get_socket_from_fd, read_socket_addr_from_user},
read_bytes_from_user,
IoVec,
},
};
@ -27,12 +27,13 @@ pub fn sys_sendto(
Some(socket_addr)
};
debug!("sockfd = {sockfd}, buf = 0x{buf:x}, len = 0x{len:x}, flags = {flags:?}, socket_addr = {socket_addr:?}");
let mut buffer = vec![0u8; len];
read_bytes_from_user(buf, &mut buffer)?;
let socket = get_socket_from_fd(sockfd)?;
let send_size = socket.sendto(&buffer, socket_addr, flags)?;
let io_vecs = [IoVec::new(buf, len)];
let message_header = MessageHeader::new(socket_addr, None);
let send_size = socket.sendmsg(&io_vecs, message_header, flags)?;
Ok(SyscallReturn::Return(send_size as _))
}

37
kernel/aster-nix/src/syscall/writev.rs
View File

@ -3,20 +3,7 @@
#![allow(dead_code)]
use super::SyscallReturn;
use crate::{
fs::file_table::FileDesc,
prelude::*,
util::{read_bytes_from_user, read_val_from_user},
};
const IOVEC_MAX: usize = 256;
#[repr(C)]
#[derive(Debug, Clone, Copy, Pod)]
pub struct IoVec {
base: Vaddr,
len: usize,
}
use crate::{fs::file_table::FileDesc, prelude::*, util::copy_iovs_from_user};
pub fn sys_writev(fd: FileDesc, io_vec_ptr: Vaddr, io_vec_count: usize) -> Result<SyscallReturn> {
let res = do_sys_writev(fd, io_vec_ptr, io_vec_count)?;
@ -33,19 +20,27 @@ fn do_sys_writev(fd: FileDesc, io_vec_ptr: Vaddr, io_vec_count: usize) -> Result
let filetable = current.file_table().lock();
filetable.get_file(fd)?.clone()
};
let mut total_len = 0;
for i in 0..io_vec_count {
let io_vec = read_val_from_user::<IoVec>(io_vec_ptr + i * core::mem::size_of::<IoVec>())?;
if io_vec.base == 0 || io_vec.len == 0 {
let io_vecs = copy_iovs_from_user(io_vec_ptr, io_vec_count)?;
for io_vec in io_vecs.as_ref() {
if io_vec.is_empty() {
continue;
}
let buffer = {
let base = io_vec.base;
let len = io_vec.len;
let mut buffer = vec![0u8; len];
read_bytes_from_user(base, &mut buffer)?;
let mut buffer = vec![0u8; io_vec.len()];
io_vec.read_exact_from_user(&mut buffer)?;
buffer
};
// FIXME: According to the man page
// at <https://man7.org/linux/man-pages/man2/readv.2.html>,
// writev must be atomic,
// but the current implementation does not ensure atomicity.
// A suitable fix would be to add a `writev` method for the `FileLike` trait,
// allowing each subsystem to implement atomicity.
let write_len = file.write(&buffer)?;
total_len += write_len;
}

131
kernel/aster-nix/src/util/iovec.rs Normal file
View File

@ -0,0 +1,131 @@
// SPDX-License-Identifier: MPL-2.0
use super::read_val_from_user;
use crate::{
prelude::*,
util::{read_bytes_from_user, write_bytes_to_user},
};
/// A kernel space IO vector.
#[derive(Debug, Clone, Copy)]
pub struct IoVec {
base: Vaddr,
len: usize,
}
/// A user space IO vector.
///
/// The difference between `IoVec` and `UserIoVec`
/// is that `UserIoVec` uses `isize` as the length type,
/// while `IoVec` uses `usize`.
#[repr(C)]
#[derive(Debug, Clone, Copy, Pod)]
struct UserIoVec {
base: Vaddr,
len: isize,
}
impl TryFrom<UserIoVec> for IoVec {
type Error = Error;
fn try_from(value: UserIoVec) -> Result<Self> {
if value.len < 0 {
return_errno_with_message!(Errno::EINVAL, "the length of IO vector cannot be negative");
}
Ok(IoVec {
base: value.base,
len: value.len as usize,
})
}
}
impl IoVec {
/// Creates a new `IoVec`.
pub const fn new(base: Vaddr, len: usize) -> Self {
Self { base, len }
}
/// Returns the base address.
pub const fn base(&self) -> Vaddr {
self.base
}
/// Returns the length.
pub const fn len(&self) -> usize {
self.len
}
/// Returns whether the `IoVec` points to an empty user buffer.
pub const fn is_empty(&self) -> bool {
self.len == 0 || self.base == 0
}
/// Reads bytes from the user space buffer pointed by
/// the `IoVec` to `dst`.
///
/// If successful, the read length will be equal to `dst.len()`.
///
/// # Panics
///
/// This method will panic if
/// 1.`dst.len()` is not the same as `self.len()`;
/// 2. `self.is_empty()` is `true`.
pub fn read_exact_from_user(&self, dst: &mut [u8]) -> Result<()> {
assert_eq!(dst.len(), self.len);
assert!(!self.is_empty());
read_bytes_from_user(self.base, dst)
}
/// Writes bytes from the `src` buffer
/// to the user space buffer pointed by the `IoVec`.
///
/// If successful, the written length will be equal to `src.len()`.
///
/// # Panics
///
/// This method will panic if
/// 1. `src.len()` is not the same as `self.len()`;
/// 2. `self.is_empty()` is `true`.
pub fn write_exact_to_user(&self, src: &[u8]) -> Result<()> {
assert_eq!(src.len(), self.len);
assert!(!self.is_empty());
write_bytes_to_user(self.base, src)
}
/// Reads bytes to the `dst` buffer
/// from the user space buffer pointed by the `IoVec`.
///
/// If successful, returns the length of actually read bytes.
pub fn read_from_user(&self, dst: &mut [u8]) -> Result<usize> {
let len = self.len.min(dst.len());
read_bytes_from_user(self.base, &mut dst[..len])?;
Ok(len)
}
/// Writes bytes from the `src` buffer
/// to the user space buffer pointed by the `IoVec`.
///
/// If successful, returns the length of actually written bytes.
pub fn write_to_user(&self, src: &[u8]) -> Result<usize> {
let len = self.len.min(src.len());
write_bytes_to_user(self.base, &src[..len])?;
Ok(len)
}
}
/// Copies IO vectors from user space.
pub fn copy_iovs_from_user(start_addr: Vaddr, count: usize) -> Result<Box<[IoVec]>> {
let mut io_vecs = Vec::with_capacity(count);
for idx in 0..count {
let addr = start_addr + idx * core::mem::size_of::<UserIoVec>();
let uiov = read_val_from_user::<UserIoVec>(addr)?;
let iov = IoVec::try_from(uiov)?;
io_vecs.push(iov);
}
Ok(io_vecs.into_boxed_slice())
}

3
kernel/aster-nix/src/util/mod.rs
View File

@ -6,9 +6,12 @@ use aster_frame::mm::VmIo;
use aster_rights::Full;
use crate::{prelude::*, vm::vmar::Vmar};
mod iovec;
pub mod net;
pub mod random;
pub use iovec::{copy_iovs_from_user, IoVec};
/// Read bytes into the `dest` buffer
/// from the user space of the current process.
/// If successful,

26
kernel/aster-nix/src/util/net/addr.rs
View File

@ -79,7 +79,25 @@ pub fn write_socket_addr_to_user(
if addrlen_ptr == 0 {
return_errno_with_message!(Errno::EINVAL, "must provide the addrlen ptr");
}
let max_len = read_val_from_user::<i32>(addrlen_ptr)? as usize;
let write_size = {
let max_len = read_val_from_user::<i32>(addrlen_ptr)?;
write_socket_addr_with_max_len(socket_addr, dest, max_len)?
};
if addrlen_ptr != 0 {
write_val_to_user(addrlen_ptr, &write_size)?;
}
Ok(())
}
pub fn write_socket_addr_with_max_len(
socket_addr: &SocketAddr,
dest: Vaddr,
max_len: i32,
) -> Result<i32> {
let max_len = max_len as usize;
let write_size = match socket_addr {
SocketAddr::Unix(path) => {
let sock_addr_unix = CSocketAddrUnix::try_from(path)?;
@ -104,10 +122,8 @@ pub fn write_socket_addr_to_user(
write_size as i32
}
};
if addrlen_ptr != 0 {
write_val_to_user(addrlen_ptr, &write_size)?;
}
Ok(())
Ok(write_size)
}
/// PlaceHolder

7
kernel/aster-nix/src/util/net/mod.rs
View File

@ -4,9 +4,12 @@ mod addr;
mod options;
mod socket;
pub use addr::{read_socket_addr_from_user, write_socket_addr_to_user, CSocketAddrFamily};
pub use addr::{
read_socket_addr_from_user, write_socket_addr_to_user, write_socket_addr_with_max_len,
CSocketAddrFamily,
};
pub use options::{new_raw_socket_option, CSocketOptionLevel};
pub use socket::{Protocol, SockFlags, SockType, SOCK_TYPE_MASK};
pub use socket::{CUserMsgHdr, Protocol, SockFlags, SockType, SOCK_TYPE_MASK};
use crate::{fs::file_table::FileDesc, net::socket::Socket, prelude::*};

50
kernel/aster-nix/src/util/net/socket.rs
View File

@ -1,6 +1,11 @@
// SPDX-License-Identifier: MPL-2.0
use crate::prelude::*;
use super::read_socket_addr_from_user;
use crate::{
net::socket::SocketAddr,
prelude::*,
util::{copy_iovs_from_user, net::write_socket_addr_with_max_len, IoVec},
};
/// Standard well-defined IP protocols.
/// From https://elixir.bootlin.com/linux/v6.0.9/source/include/uapi/linux/in.h.
@ -68,3 +73,46 @@ bitflags! {
const SOCK_CLOEXEC = 1 << 19;
}
}
#[repr(C)]
#[derive(Debug, Clone, Copy, Pod)]
pub struct CUserMsgHdr {
/// Pointer to socket address structure
pub msg_name: Vaddr,
/// Size of socket address
pub msg_namelen: i32,
/// Scatter/Gather iov array
pub msg_iov: Vaddr,
/// The # of elements in msg_iov
pub msg_iovlen: u32,
/// Ancillary data
pub msg_control: Vaddr,
/// Ancillary data buffer length
pub msg_controllen: u32,
/// Flags on received message
pub msg_flags: u32,
}
impl CUserMsgHdr {
pub fn read_socket_addr_from_user(&self) -> Result<Option<SocketAddr>> {
if self.msg_name == 0 {
return Ok(None);
}
let socket_addr = read_socket_addr_from_user(self.msg_name, self.msg_namelen as usize)?;
Ok(Some(socket_addr))
}
pub fn write_socket_addr_to_user(&self, addr: &SocketAddr) -> Result<()> {
if self.msg_name == 0 {
return Ok(());
}
write_socket_addr_with_max_len(addr, self.msg_name, self.msg_namelen)?;
Ok(())
}
pub fn copy_iovs_from_user(&self) -> Result<Box<[IoVec]>> {
copy_iovs_from_user(self.msg_iov, self.msg_iovlen as usize)
}
}

71
regression/apps/network/tcp_err.c
View File

@ -6,6 +6,7 @@
#include <sys/poll.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include "test.h"
@ -290,3 +291,73 @@ FN_TEST(async_connect)
errlen == sizeof(err) && err == 0);
}
END_TEST()
void set_blocking(int sockfd)
{
int flags = CHECK(fcntl(sockfd, F_GETFL, 0));
CHECK(fcntl(sockfd, F_SETFL, flags & (~O_NONBLOCK)));
}
FN_SETUP(enter_blocking_mode)
{
set_blocking(sk_connected);
set_blocking(sk_bound);
}
END_SETUP()
FN_TEST(sendmsg_and_recvmsg)
{
struct msghdr msg = { 0 };
struct iovec iov[2];
char *message = "Message:";
char *message2 = "Hello";
iov[0].iov_base = message;
iov[0].iov_len = strlen(message);
iov[1].iov_base = message2;
iov[1].iov_len = strlen(message2);
msg.msg_iov = iov;
msg.msg_iovlen = 2;
// Send one message and recv one message
TEST_RES(sendmsg(sk_connected, &msg, 0),
_ret == strlen(message) + strlen(message2));
#define BUFFER_SIZE 50
char concatenated[BUFFER_SIZE] = { 0 };
strcat(concatenated, message);
strcat(concatenated, message2);
char buffer[BUFFER_SIZE] = { 0 };
iov[0].iov_base = buffer;
iov[0].iov_len = BUFFER_SIZE;
msg.msg_iovlen = 1;
TEST_RES(recvmsg(sk_accepted, &msg, 0),
_ret == strlen(concatenated) &&
strcmp(buffer, concatenated) == 0);
// Send two message and receive two message
// This test is commented out due to a known issue:
// See <https://github.com/asterinas/asterinas/issues/819>
// iov[0].iov_base = message;
// iov[0].iov_len = strlen(message);
// msg.msg_iovlen = 1;
// TEST_RES(sendmsg(sk_accepted, &msg, 0), _ret == strlen(message));
// TEST_RES(sendmsg(sk_accepted, &msg, 0), _ret == strlen(message));
// char first_buffer[BUFFER_SIZE] = { 0 };
// char second_buffer[BUFFER_SIZE] = { 0 };
// iov[0].iov_base = first_buffer;
// iov[0].iov_len = BUFFER_SIZE;
// iov[1].iov_base = second_buffer;
// iov[1].iov_len = BUFFER_SIZE;
// msg.msg_iovlen = 2;
// // Ensure two messages are prepared for receiving
// sleep(1);
// TEST_RES(recvmsg(sk_connected, &msg, 0), _ret == strlen(message) * 2);
}
END_TEST()

61
regression/apps/network/udp_err.c
View File

@ -6,6 +6,7 @@
#include <sys/poll.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include "test.h"
@ -198,3 +199,63 @@ FN_TEST(connect)
TEST_SUCC(connect(sk_connected, psaddr, addrlen));
}
END_TEST()
void set_blocking(int sockfd)
{
int flags = CHECK(fcntl(sockfd, F_GETFL, 0));
CHECK(fcntl(sockfd, F_SETFL, flags & (~O_NONBLOCK)));
}
FN_SETUP(enter_blocking_mode)
{
set_blocking(sk_connected);
set_blocking(sk_bound);
}
END_SETUP()
FN_TEST(sendmsg_and_recvmsg)
{
struct sockaddr_in saddr;
socklen_t addrlen = sizeof(saddr);
sk_addr.sin_port = C_PORT;
struct msghdr msg = { 0 };
struct iovec iov[1];
char *message = "Message";
iov[0].iov_base = message;
iov[0].iov_len = strlen(message);
msg.msg_iov = iov;
msg.msg_iovlen = 1;
msg.msg_name = (struct sockaddr *)&sk_addr;
msg.msg_namelen = addrlen;
// Send one message and receive one message
TEST_RES(sendmsg(sk_connected, &msg, 0), _ret == strlen(message));
#define BUFFER_SIZE 50
char buffer[BUFFER_SIZE];
iov[0].iov_base = buffer;
iov[0].iov_len = BUFFER_SIZE;
msg.msg_name = 0;
TEST_RES(recvmsg(sk_bound, &msg, 0),
_ret == strlen(message) && strcmp(message, buffer) == 0);
// Send two messages and receive two messages
iov[0].iov_base = message;
iov[0].iov_len = strlen(message);
msg.msg_name = (struct sockaddr *)&sk_addr;
msg.msg_namelen = addrlen;
TEST_RES(sendmsg(sk_connected, &msg, 0), _ret == strlen(message));
TEST_RES(sendmsg(sk_connected, &msg, 0), _ret == strlen(message));
iov[0].iov_base = buffer;
iov[0].iov_len = BUFFER_SIZE;
TEST_RES(recvmsg(sk_bound, &msg, 0),
_ret == strlen(message) && strcmp(message, buffer) == 0);
TEST_RES(recvmsg(sk_bound, &msg, 0),
_ret == strlen(message) && strcmp(message, buffer) == 0);
}
END_TEST()