xous: net: initial commit of network support

This is an initial commit of network support for Xous.

On hardware, is backed by smoltcp running via a Xous server in a
separate process space.

This patch adds TCP and UDP client and server support as well as DNS
resolution support using the dns Xous server.

Signed-off-by: Sean Cross <sean@xobs.io>

library/std/src/os/xous/services.rs

@@ -1,9 +1,15 @@
 use crate::os::xous::ffi::Connection;
 use core::sync::atomic::{AtomicU32, Ordering};
 
+mod dns;
+pub(crate) use dns::*;
+
 mod log;
 pub(crate) use log::*;
 
+mod net;
+pub(crate) use net::*;
+
 mod systime;
 pub(crate) use systime::*;
 

library/std/src/os/xous/services/dns.rs

@@ -0,0 +1,28 @@
+use crate::os::xous::ffi::Connection;
+use crate::os::xous::services::connect;
+use core::sync::atomic::{AtomicU32, Ordering};
+
+#[repr(usize)]
+pub(crate) enum DnsLendMut {
+    RawLookup = 6,
+}
+
+impl Into<usize> for DnsLendMut {
+    fn into(self) -> usize {
+        self as usize
+    }
+}
+
+/// Return a `Connection` to the DNS lookup server. This server is used for
+/// querying domain name values.
+pub(crate) fn dns_server() -> Connection {
+    static DNS_CONNECTION: AtomicU32 = AtomicU32::new(0);
+    let cid = DNS_CONNECTION.load(Ordering::Relaxed);
+    if cid != 0 {
+        return cid.into();
+    }
+
+    let cid = connect("_DNS Resolver Middleware_").unwrap();
+    DNS_CONNECTION.store(cid.into(), Ordering::Relaxed);
+    cid
+}

library/std/src/os/xous/services/net.rs

@@ -0,0 +1,95 @@
+use crate::os::xous::ffi::Connection;
+use crate::os::xous::services::connect;
+use core::sync::atomic::{AtomicU32, Ordering};
+
+pub(crate) enum NetBlockingScalar {
+    StdGetTtlUdp(u16 /* fd */),                /* 36 */
+    StdSetTtlUdp(u16 /* fd */, u32 /* ttl */), /* 37 */
+    StdGetTtlTcp(u16 /* fd */),                /* 36 */
+    StdSetTtlTcp(u16 /* fd */, u32 /* ttl */), /* 37 */
+    StdGetNodelay(u16 /* fd */),               /* 38 */
+    StdSetNodelay(u16 /* fd */, bool),         /* 39 */
+    StdTcpClose(u16 /* fd */),                 /* 34 */
+    StdUdpClose(u16 /* fd */),                 /* 41 */
+    StdTcpStreamShutdown(u16 /* fd */, crate::net::Shutdown /* how */), /* 46 */
+}
+
+pub(crate) enum NetLendMut {
+    StdTcpConnect,                                    /* 30 */
+    StdTcpTx(u16 /* fd */),                           /* 31 */
+    StdTcpPeek(u16 /* fd */, bool /* nonblocking */), /* 32 */
+    StdTcpRx(u16 /* fd */, bool /* nonblocking */),   /* 33 */
+    StdGetAddress(u16 /* fd */),                      /* 35 */
+    StdUdpBind,                                       /* 40 */
+    StdUdpRx(u16 /* fd */),                           /* 42 */
+    StdUdpTx(u16 /* fd */),                           /* 43 */
+    StdTcpListen,                                     /* 44 */
+    StdTcpAccept(u16 /* fd */),                       /* 45 */
+}
+
+impl Into<usize> for NetLendMut {
+    fn into(self) -> usize {
+        match self {
+            NetLendMut::StdTcpConnect => 30,
+            NetLendMut::StdTcpTx(fd) => 31 | ((fd as usize) << 16),
+            NetLendMut::StdTcpPeek(fd, blocking) => {
+                32 | ((fd as usize) << 16) | if blocking { 0x8000 } else { 0 }
+            }
+            NetLendMut::StdTcpRx(fd, blocking) => {
+                33 | ((fd as usize) << 16) | if blocking { 0x8000 } else { 0 }
+            }
+            NetLendMut::StdGetAddress(fd) => 35 | ((fd as usize) << 16),
+            NetLendMut::StdUdpBind => 40,
+            NetLendMut::StdUdpRx(fd) => 42 | ((fd as usize) << 16),
+            NetLendMut::StdUdpTx(fd) => 43 | ((fd as usize) << 16),
+            NetLendMut::StdTcpListen => 44,
+            NetLendMut::StdTcpAccept(fd) => 45 | ((fd as usize) << 16),
+        }
+    }
+}
+
+impl<'a> Into<[usize; 5]> for NetBlockingScalar {
+    fn into(self) -> [usize; 5] {
+        match self {
+            NetBlockingScalar::StdGetTtlTcp(fd) => [36 | ((fd as usize) << 16), 0, 0, 0, 0],
+            NetBlockingScalar::StdGetTtlUdp(fd) => [36 | ((fd as usize) << 16), 0, 0, 0, 1],
+            NetBlockingScalar::StdSetTtlTcp(fd, ttl) => {
+                [37 | ((fd as usize) << 16), ttl as _, 0, 0, 0]
+            }
+            NetBlockingScalar::StdSetTtlUdp(fd, ttl) => {
+                [37 | ((fd as usize) << 16), ttl as _, 0, 0, 1]
+            }
+            NetBlockingScalar::StdGetNodelay(fd) => [38 | ((fd as usize) << 16), 0, 0, 0, 0],
+            NetBlockingScalar::StdSetNodelay(fd, enabled) => {
+                [39 | ((fd as usize) << 16), if enabled { 1 } else { 0 }, 0, 0, 1]
+            }
+            NetBlockingScalar::StdTcpClose(fd) => [34 | ((fd as usize) << 16), 0, 0, 0, 0],
+            NetBlockingScalar::StdUdpClose(fd) => [41 | ((fd as usize) << 16), 0, 0, 0, 0],
+            NetBlockingScalar::StdTcpStreamShutdown(fd, how) => [
+                46 | ((fd as usize) << 16),
+                match how {
+                    crate::net::Shutdown::Read => 1,
+                    crate::net::Shutdown::Write => 2,
+                    crate::net::Shutdown::Both => 3,
+                },
+                0,
+                0,
+                0,
+            ],
+        }
+    }
+}
+
+/// Return a `Connection` to the Network server. This server provides all
+/// OS-level networking functions.
+pub(crate) fn net_server() -> Connection {
+    static NET_CONNECTION: AtomicU32 = AtomicU32::new(0);
+    let cid = NET_CONNECTION.load(Ordering::Relaxed);
+    if cid != 0 {
+        return cid.into();
+    }
+
+    let cid = connect("_Middleware Network Server_").unwrap();
+    NET_CONNECTION.store(cid.into(), Ordering::Relaxed);
+    cid
+}

library/std/src/sys/pal/xous/mod.rs

@@ -12,7 +12,6 @@ pub mod fs;
 #[path = "../unsupported/io.rs"]
 pub mod io;
 pub mod locks;
-#[path = "../unsupported/net.rs"]
 pub mod net;
 pub mod os;
 #[path = "../unix/os_str.rs"]

library/std/src/sys/pal/xous/net/dns.rs

@@ -0,0 +1,127 @@
+use crate::io;
+use crate::net::{Ipv4Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
+use crate::os::xous::ffi::lend_mut;
+use crate::os::xous::services::{dns_server, DnsLendMut};
+use core::convert::{TryFrom, TryInto};
+
+pub struct DnsError {
+    pub code: u8,
+}
+
+#[repr(C, align(4096))]
+struct LookupHostQuery([u8; 4096]);
+
+pub struct LookupHost {
+    data: LookupHostQuery,
+    port: u16,
+    offset: usize,
+    count: usize,
+}
+
+impl LookupHost {
+    pub fn port(&self) -> u16 {
+        self.port
+    }
+}
+
+impl Iterator for LookupHost {
+    type Item = SocketAddr;
+    fn next(&mut self) -> Option<SocketAddr> {
+        if self.offset >= self.data.0.len() {
+            return None;
+        }
+        match self.data.0.get(self.offset) {
+            Some(&4) => {
+                self.offset += 1;
+                if self.offset + 4 > self.data.0.len() {
+                    return None;
+                }
+                let result = Some(SocketAddr::V4(SocketAddrV4::new(
+                    Ipv4Addr::new(
+                        self.data.0[self.offset],
+                        self.data.0[self.offset + 1],
+                        self.data.0[self.offset + 2],
+                        self.data.0[self.offset + 3],
+                    ),
+                    self.port,
+                )));
+                self.offset += 4;
+                result
+            }
+            Some(&6) => {
+                self.offset += 1;
+                if self.offset + 16 > self.data.0.len() {
+                    return None;
+                }
+                let mut new_addr = [0u8; 16];
+                for (src, octet) in self.data.0[(self.offset + 1)..(self.offset + 16 + 1)]
+                    .iter()
+                    .zip(new_addr.iter_mut())
+                {
+                    *octet = *src;
+                }
+                let result =
+                    Some(SocketAddr::V6(SocketAddrV6::new(new_addr.into(), self.port, 0, 0)));
+                self.offset += 16;
+                result
+            }
+            _ => None,
+        }
+    }
+}
+
+pub fn lookup(query: &str, port: u16) -> Result<LookupHost, DnsError> {
+    let mut result = LookupHost { data: LookupHostQuery([0u8; 4096]), offset: 0, count: 0, port };
+
+    // Copy the query into the message that gets sent to the DNS server
+    for (query_byte, result_byte) in query.as_bytes().iter().zip(result.data.0.iter_mut()) {
+        *result_byte = *query_byte;
+    }
+
+    lend_mut(
+        dns_server(),
+        DnsLendMut::RawLookup.into(),
+        &mut result.data.0,
+        0,
+        query.as_bytes().len(),
+    )
+    .unwrap();
+    if result.data.0[0] != 0 {
+        return Err(DnsError { code: result.data.0[1] });
+    }
+    assert_eq!(result.offset, 0);
+    result.count = result.data.0[1] as usize;
+
+    // Advance the offset to the first record
+    result.offset = 2;
+    Ok(result)
+}
+
+impl TryFrom<&str> for LookupHost {
+    type Error = io::Error;
+
+    fn try_from(s: &str) -> io::Result<LookupHost> {
+        macro_rules! try_opt {
+            ($e:expr, $msg:expr) => {
+                match $e {
+                    Some(r) => r,
+                    None => return Err(io::const_io_error!(io::ErrorKind::InvalidInput, &$msg)),
+                }
+            };
+        }
+
+        // split the string by ':' and convert the second part to u16
+        let (host, port_str) = try_opt!(s.rsplit_once(':'), "invalid socket address");
+        let port: u16 = try_opt!(port_str.parse().ok(), "invalid port value");
+        (host, port).try_into()
+    }
+}
+
+impl TryFrom<(&str, u16)> for LookupHost {
+    type Error = io::Error;
+
+    fn try_from(v: (&str, u16)) -> io::Result<LookupHost> {
+        lookup(v.0, v.1)
+            .map_err(|_e| io::const_io_error!(io::ErrorKind::InvalidInput, &"DNS failure"))
+    }
+}

library/std/src/sys/pal/xous/net/mod.rs

@@ -0,0 +1,84 @@
+mod dns;
+
+mod tcpstream;
+pub use tcpstream::*;
+
+mod tcplistener;
+pub use tcplistener::*;
+
+mod udp;
+pub use udp::*;
+
+// this structure needs to be synchronized with what's in net/src/api.rs
+#[repr(C)]
+#[derive(Debug)]
+enum NetError {
+    // Ok = 0,
+    Unaddressable = 1,
+    SocketInUse = 2,
+    // AccessDenied = 3,
+    Invalid = 4,
+    // Finished = 5,
+    LibraryError = 6,
+    // AlreadyUsed = 7,
+    TimedOut = 8,
+    WouldBlock = 9,
+}
+
+#[repr(C, align(4096))]
+struct ConnectRequest {
+    raw: [u8; 4096],
+}
+
+#[repr(C, align(4096))]
+struct SendData {
+    raw: [u8; 4096],
+}
+
+#[repr(C, align(4096))]
+pub struct ReceiveData {
+    raw: [u8; 4096],
+}
+
+#[repr(C, align(4096))]
+pub struct GetAddress {
+    raw: [u8; 4096],
+}
+
+pub use dns::LookupHost;
+
+#[allow(nonstandard_style)]
+pub mod netc {
+    pub const AF_INET: u8 = 0;
+    pub const AF_INET6: u8 = 1;
+    pub type sa_family_t = u8;
+
+    #[derive(Copy, Clone)]
+    pub struct in_addr {
+        pub s_addr: u32,
+    }
+
+    #[derive(Copy, Clone)]
+    pub struct sockaddr_in {
+        pub sin_family: sa_family_t,
+        pub sin_port: u16,
+        pub sin_addr: in_addr,
+    }
+
+    #[derive(Copy, Clone)]
+    pub struct in6_addr {
+        pub s6_addr: [u8; 16],
+    }
+
+    #[derive(Copy, Clone)]
+    pub struct sockaddr_in6 {
+        pub sin6_family: sa_family_t,
+        pub sin6_port: u16,
+        pub sin6_addr: in6_addr,
+        pub sin6_flowinfo: u32,
+        pub sin6_scope_id: u32,
+    }
+
+    #[derive(Copy, Clone)]
+    pub struct sockaddr {}
+}