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Copy pathnetdevice.cc
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106 lines (87 loc) · 3.07 KB
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/* -*-mode:c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <arpa/inet.h>
#include <functional>
#include "netdevice.hh"
#include "exception.hh"
#include "ezio.hh"
#include "socket.hh"
#include "util.hh"
#include "system_runner.hh"
#include "config.h"
using namespace std;
TunDevice::TunDevice( const string & name,
const Address & addr,
const Address & peer )
: FileDescriptor( SystemCall( "open /dev/net/tun", open( "/dev/net/tun", O_RDWR ) ) )
{
interface_ioctl( *this, TUNSETIFF, name,
[] ( ifreq &ifr ) { ifr.ifr_flags = IFF_TUN; } );
assign_address( name, addr, peer );
}
void interface_ioctl( FileDescriptor & fd, const int request,
const string & name,
function<void( ifreq &ifr )> ifr_adjustment)
{
ifreq ifr;
zero( ifr );
strncpy( ifr.ifr_name, name.c_str(), IFNAMSIZ ); /* interface name */
ifr_adjustment( ifr );
SystemCall( "ioctl " + name, ioctl( fd.num(), request, static_cast<void *>( &ifr ) ) );
}
void interface_ioctl( FileDescriptor && fd, const int request,
const string & name,
function<void( ifreq &ifr )> ifr_adjustment)
{
interface_ioctl( fd, request, name, ifr_adjustment );
}
void assign_address( const string & device_name, const Address & addr, const Address & peer )
{
Socket ioctl_socket( UDP );
/* assign address */
interface_ioctl( ioctl_socket, SIOCSIFADDR, device_name,
[&] ( ifreq &ifr )
{ ifr.ifr_addr = addr.raw_sockaddr(); } );
/* destination */
interface_ioctl( ioctl_socket, SIOCSIFDSTADDR, device_name,
[&] ( ifreq &ifr )
{ ifr.ifr_addr = peer.raw_sockaddr(); } );
/* netmask */
interface_ioctl( ioctl_socket, SIOCSIFNETMASK, device_name,
[&] ( ifreq &ifr )
{ ifr.ifr_netmask = Address( "255.255.255.255", 0 ).raw_sockaddr(); } );
/* bring interface up */
interface_ioctl( ioctl_socket, SIOCSIFFLAGS, device_name,
[] ( ifreq &ifr ) { ifr.ifr_flags = IFF_UP; } );
}
void name_check( const string & str )
{
if ( str.find( "veth-" ) != 0 ) {
throw Exception( str, "name of veth device must start with \"veth-\"" );
}
}
VirtualEthernetPair::VirtualEthernetPair( const string & outside_name, const string & inside_name )
: name_( outside_name ),
kernel_will_destroy_( false )
{
/* make pair of veth devices */
name_check( outside_name );
name_check( inside_name );
run( { IP, "link", "add", outside_name, "type", "veth", "peer", "name", inside_name } );
}
VirtualEthernetPair::~VirtualEthernetPair()
{
if ( kernel_will_destroy_ ) {
return;
}
try {
run( { IP, "link", "del", name_ } );
} catch ( const Exception & e ) {
e.perror();
}
/* deleting one is sufficient to delete both */
}