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/*
* Copyright 2013 Google Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/*
* Author: ncardwell@google.com (Neal Cardwell)
*
* Client-side network device code for remote on-the-wire testing
* using a real NIC.
*/
#include "wire_client_netdev.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "logging.h"
#include "net_utils.h"
struct wire_client_netdev {
struct netdev netdev; /* "inherit" from netdev */
char *name; /* malloc-allocated copy of interface name */
};
struct netdev_ops wire_client_netdev_ops;
/* "Downcast" an abstract netdev to our flavor. */
static inline struct wire_client_netdev *to_client_netdev(
struct netdev *netdev)
{
return (struct wire_client_netdev *)netdev;
}
/* Check that the remote IP is actually remote. It must be to ensure
* that test packets will pass through our device.
*/
static void check_remote_address(struct config *config,
struct wire_client_netdev *netdev)
{
if (is_ip_local(&config->live_remote_ip)) {
die("error: live_remote_ip %s is not remote\n",
config->live_remote_ip_string);
}
}
/* Route traffic destined for our remote IP through this device */
static void route_traffic_to_wire_server(struct config *config,
struct wire_client_netdev *netdev)
{
char *route_command = NULL;
#ifdef linux
asprintf(&route_command,
"ip %s route del %s > /dev/null 2>&1 ; "
"ip %s route add %s dev %s via %s > /dev/null 2>&1",
(config->wire_protocol == AF_INET6) ? "-6" : "",
config->live_remote_prefix_string,
(config->wire_protocol == AF_INET6) ? "-6" : "",
config->live_remote_prefix_string,
netdev->name,
config->live_gateway_ip_string);
#endif
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
if (config->wire_protocol == AF_INET) {
asprintf(&route_command,
"route delete %s > /dev/null 2>&1 ; "
"route add %s %s > /dev/null 2>&1",
config->live_remote_prefix_string,
config->live_remote_prefix_string,
config->live_gateway_ip_string);
} else if (config->wire_protocol == AF_INET6) {
asprintf(&route_command,
"route delete -inet6 %s > /dev/null 2>&1 ; "
"route add -inet6 %s %s > /dev/null 2>&1",
config->live_remote_prefix_string,
config->live_remote_prefix_string,
config->live_gateway_ip_string);
} else {
assert(!"bad wire protocol");
}
#endif /* defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) */
/* We intentionally ignore failures and output to stderr,
* since they can happen if there is no previously existing
* route.
*/
system(route_command);
free(route_command);
}
struct netdev *wire_client_netdev_new(struct config *config)
{
DEBUGP("wire_client_netdev_new\n");
struct wire_client_netdev *netdev =
calloc(1, sizeof(struct wire_client_netdev));
netdev->netdev.ops = &wire_client_netdev_ops;
netdev->name = strdup(config->wire_client_device);
check_remote_address(config, netdev);
/* Add the client live local IP to our NIC, so we can send/receive */
net_setup_dev_address(netdev->name,
&config->live_local_ip,
config->live_prefix_len);
route_traffic_to_wire_server(config, netdev);
return (struct netdev *)netdev;
}
static void wire_client_netdev_free(struct netdev *a_netdev)
{
DEBUGP("wire_client_netdev_free\n");
struct wire_client_netdev *netdev = to_client_netdev(a_netdev);
free(netdev->name);
memset(netdev, 0, sizeof(*netdev)); /* paranoia */
free(netdev);
}
static int wire_client_netdev_send(struct netdev *a_netdev,
struct packet *packet)
{
DEBUGP("wire_client_netdev_send\n");
assert(!"wire clients should not be sending packets themselves!");
/* The server side should be sending the packets... */
return STATUS_ERR;
}
static int wire_client_netdev_receive(struct netdev *a_netdev,
struct packet **packet, char **error)
{
DEBUGP("wire_client_netdev_receive\n");
assert(!"wire clients should not be receiving packets themselves!");
/* The server side should be receiving and checking the packets... */
return STATUS_ERR;
}
struct netdev_ops wire_client_netdev_ops = {
.free = wire_client_netdev_free,
.send = wire_client_netdev_send,
.receive = wire_client_netdev_receive,
};
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