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/*
device.c -- raw socket
Copyright (C) 2002-2005 Ivo Timmermans,
2002-2014 Guus Sliepen <guus@tinc-vpn.org>
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.
*/
#include "system.h"
#ifdef HAVE_NETPACKET_PACKET_H
#include <netpacket/packet.h>
#endif
#include "conf.h"
#include "device.h"
#include "net.h"
#include "logger.h"
#include "utils.h"
#include "route.h"
#include "xalloc.h"
#if defined(PF_PACKET) && defined(ETH_P_ALL) && defined(AF_PACKET) && defined(SIOCGIFINDEX)
static const char *device_info = "raw_socket";
static uint64_t device_total_in = 0;
static uint64_t device_total_out = 0;
static bool setup_device(void) {
struct ifreq ifr;
struct sockaddr_ll sa;
if(!get_config_string(lookup_config(config_tree, "Interface"), &iface)) {
iface = xstrdup("eth0");
}
if(!get_config_string(lookup_config(config_tree, "Device"), &device)) {
device = xstrdup(iface);
}
if((device_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0) {
logger(LOG_ERR, "Could not open %s: %s", device_info,
strerror(errno));
return false;
}
#ifdef FD_CLOEXEC
fcntl(device_fd, F_SETFD, FD_CLOEXEC);
#endif
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
if(ioctl(device_fd, SIOCGIFINDEX, &ifr)) {
close(device_fd);
logger(LOG_ERR, "Can't find interface %s: %s", ifr.ifr_ifrn.ifrn_name, strerror(errno));
return false;
}
memset(&sa, 0, sizeof(sa));
sa.sll_family = AF_PACKET;
sa.sll_protocol = htons(ETH_P_ALL);
sa.sll_ifindex = ifr.ifr_ifindex;
if(bind(device_fd, (struct sockaddr *) &sa, (socklen_t) sizeof(sa))) {
logger(LOG_ERR, "Could not bind %s to %s: %s", device, ifr.ifr_ifrn.ifrn_name, strerror(errno));
return false;
}
logger(LOG_INFO, "%s is a %s", device, device_info);
return true;
}
static void close_device(void) {
close(device_fd);
free(device);
free(iface);
}
static bool read_packet(vpn_packet_t *packet) {
int lenin;
if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
device, strerror(errno));
return false;
}
packet->len = lenin;
device_total_in += packet->len;
ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
device_info);
return true;
}
static bool write_packet(vpn_packet_t *packet) {
ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
packet->len, device_info);
if(write(device_fd, packet->data, packet->len) < 0) {
logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device,
strerror(errno));
return false;
}
device_total_out += packet->len;
return true;
}
static void dump_device_stats(void) {
logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
logger(LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in);
logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
}
const devops_t raw_socket_devops = {
.setup = setup_device,
.close = close_device,
.read = read_packet,
.write = write_packet,
.dump_stats = dump_device_stats,
};
#else
static bool not_supported(void) {
logger(LOG_ERR, "Raw socket device not supported on this platform");
return false;
}
const devops_t raw_socket_devops = {
.setup = not_supported,
.close = NULL,
.read = NULL,
.write = NULL,
.dump_stats = NULL,
};
#endif
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