mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
synced 2024-11-05 11:31:14 +00:00
576a28ae5e
We must ensure our MAC addresses do not conflict with a global one. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
89 lines
2.6 KiB
Rust
89 lines
2.6 KiB
Rust
// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
|
|
// SPDX-License-Identifier: Apache-2.0
|
|
//
|
|
// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the THIRD-PARTY file.
|
|
|
|
// This is only used by the tests module from tap.rs, but we cannot use #[macro_use] unless the
|
|
// reference to lazy_static is declared at the root level of the importing crate.
|
|
#[cfg(test)]
|
|
#[macro_use]
|
|
extern crate lazy_static;
|
|
extern crate libc;
|
|
extern crate rand;
|
|
extern crate serde;
|
|
|
|
extern crate net_gen;
|
|
extern crate vmm_sys_util;
|
|
|
|
mod mac;
|
|
mod tap;
|
|
|
|
use std::io::Error as IoError;
|
|
use std::mem;
|
|
use std::net;
|
|
use std::os::unix::io::FromRawFd;
|
|
|
|
pub use mac::{MacAddr, MAC_ADDR_LEN};
|
|
pub use tap::{Error as TapError, Tap};
|
|
|
|
#[derive(Debug)]
|
|
pub enum Error {
|
|
/// Failed to create a socket.
|
|
CreateSocket(IoError),
|
|
}
|
|
|
|
pub type Result<T> = std::result::Result<T, Error>;
|
|
|
|
/// Create a sockaddr_in from an IPv4 address, and expose it as
|
|
/// an opaque sockaddr suitable for usage by socket ioctls.
|
|
fn create_sockaddr(ip_addr: net::Ipv4Addr) -> net_gen::sockaddr {
|
|
// IPv4 addresses big-endian (network order), but Ipv4Addr will give us
|
|
// a view of those bytes directly so we can avoid any endian trickiness.
|
|
let addr_in = net_gen::sockaddr_in {
|
|
sin_family: net_gen::AF_INET as u16,
|
|
sin_port: 0,
|
|
sin_addr: unsafe { mem::transmute(ip_addr.octets()) },
|
|
__pad: [0; 8usize],
|
|
};
|
|
|
|
unsafe { mem::transmute(addr_in) }
|
|
}
|
|
|
|
fn create_socket() -> Result<net::UdpSocket> {
|
|
// This is safe since we check the return value.
|
|
let sock = unsafe { libc::socket(libc::AF_INET, libc::SOCK_DGRAM, 0) };
|
|
if sock < 0 {
|
|
return Err(Error::CreateSocket(IoError::last_os_error()));
|
|
}
|
|
|
|
// This is safe; nothing else will use or hold onto the raw sock fd.
|
|
Ok(unsafe { net::UdpSocket::from_raw_fd(sock) })
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn test_create_sockaddr() {
|
|
let addr: net::Ipv4Addr = "10.0.0.1".parse().unwrap();
|
|
let sockaddr = create_sockaddr(addr);
|
|
|
|
assert_eq!(sockaddr.sa_family, net_gen::AF_INET as u16);
|
|
|
|
let data = &sockaddr.sa_data[..];
|
|
|
|
// The first two bytes should represent the port, which is 0.
|
|
assert_eq!(data[0], 0);
|
|
assert_eq!(data[1], 0);
|
|
|
|
// The next four bytes should represent the actual IPv4 address, in network order.
|
|
assert_eq!(data[2], 10);
|
|
assert_eq!(data[3], 0);
|
|
assert_eq!(data[4], 0);
|
|
assert_eq!(data[5], 1);
|
|
}
|
|
}
|