vsock/tsi_dgram: Make send_to bind to correct socket adress structs

We need to bind to the correct socket types (IPv6, Unix) instead of only IPv4.
This fixes UDP and unix dgram tests hanging when waiting for reply.

Signed-off-by: Matej Hrica <mhrica@redhat.com>

Author: mtjhrc

src/devices/src/virtio/vsock/tsi_dgram.rs

@@ -1,5 +1,5 @@
 use std::collections::HashMap;
-use std::net::{Ipv4Addr, SocketAddrV4};
+use std::net::{Ipv4Addr, Ipv6Addr, SocketAddrV4, SocketAddrV6};
 use std::num::Wrapping;
 use std::os::fd::OwnedFd;
 use std::os::unix::io::{AsRawFd, RawFd};
@@ -8,7 +8,7 @@ use std::sync::{Arc, Mutex};
 use nix::fcntl::{fcntl, FcntlArg, OFlag};
 use nix::sys::socket::{
     bind, connect, getpeername, recv, send, sendto, socket, AddressFamily, MsgFlags, SockFlag,
-    SockType, SockaddrIn, SockaddrLike, SockaddrStorage,
+    SockType, SockaddrIn, SockaddrLike, SockaddrStorage, UnixAddr,
 };
 
 #[cfg(target_os = "macos")]
@@ -35,6 +35,7 @@ pub struct TsiDgramProxy {
     pub status: ProxyStatus,
     sendto_addr: Option<SockaddrStorage>,
     listening: bool,
+    family: AddressFamily,
     mem: GuestMemoryMmap,
     queue: Arc<Mutex<VirtQueue>>,
     rxq: Arc<Mutex<MuxerRxQ>>,
@@ -102,6 +103,7 @@ impl TsiDgramProxy {
             status: ProxyStatus::Idle,
             sendto_addr: None,
             listening: false,
+            family,
             mem,
             queue,
             rxq,
@@ -339,7 +341,25 @@ impl Proxy for TsiDgramProxy {
 
         self.sendto_addr = Some(req.addr);
         if !self.listening {
-            match bind(self.fd.as_raw_fd(), &SockaddrIn::new(0, 0, 0, 0, 0)) {
+            let bind_result = match self.family {
+                AddressFamily::Inet => bind(self.fd.as_raw_fd(), &SockaddrIn::new(0, 0, 0, 0, 0)),
+                AddressFamily::Inet6 => {
+                    let addr6: SockaddrStorage =
+                        SocketAddrV6::new(Ipv6Addr::UNSPECIFIED, 0, 0, 0).into();
+                    bind(self.fd.as_raw_fd(), &addr6)
+                }
+                #[cfg(target_os = "linux")]
+                AddressFamily::Unix => {
+                    let addr = UnixAddr::new_unnamed();
+                    bind(self.fd.as_raw_fd(), &addr)
+                }
+                _ => {
+                    warn!("sendto_addr: unsupported address family: {:?}", self.family);
+                    return update;
+                }
+            };
+
+            match bind_result {
                 Ok(_) => {
                     self.listening = true;
                     update.polling = Some((self.id, self.fd.as_raw_fd(), EventSet::IN));