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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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