Add support for VDE through libvdeplug.

When compiled with vde/device.c, tinc will connect to a vde_switch instance
instead of using a tun/tap device.

diff --git a/src/vde/device.c b/src/vde/device.c
new file mode 100644 (file)
index 0000000..6148ccb
--- /dev/null
+++ b/src/vde/device.c
@@ -0,0 +1,133 @@
+/*
+    device.c -- VDE plug
+    Copyright (C) 2011 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"
+
+#include <libvdeplug_dyn.h>
+
+#include "conf.h"
+#include "net.h"
+#include "logger.h"
+#include "utils.h"
+#include "route.h"
+#include "xalloc.h"
+
+int device_fd = -1;
+static struct vdepluglib plug;
+static struct vdeconn *conn = NULL;
+static int port = 0;
+static char *group = NULL;
+char *device = NULL;
+char *iface = NULL;
+static char *device_info;
+
+extern char *identname;
+extern bool running;
+
+static uint64_t device_total_in = 0;
+static uint64_t device_total_out = 0;
+
+bool setup_device(void) {
+       libvdeplug_dynopen(plug);
+
+       if(!plug.dl_handle) {
+               logger(LOG_ERR, "Could not open libvdeplug library!");
+               return false;
+       }
+
+       if(!get_config_string(lookup_config(config_tree, "Device"), &device))
+               xasprintf(&device, LOCALSTATEDIR "/run/vde.ctl");
+
+       get_config_string(lookup_config(config_tree, "Interface"), &iface);
+
+       get_config_int(lookup_config(config_tree, "VDEPort"), &port);
+
+       get_config_string(lookup_config(config_tree, "VDEGroup"), &group);
+
+       device_info = "VDE socket";
+
+       struct vde_open_args args = {
+               .port = port,
+               .group = group,
+               .mode = 0700,
+       };
+
+       conn = plug.vde_open(device, identname, &args);
+       if(!conn) {
+               logger(LOG_ERR, "Could not open VDE socket %s", device);
+               return false;
+       }
+
+       device_fd = plug.vde_datafd(conn);
+
+       logger(LOG_INFO, "%s is a %s", device, device_info);
+
+       if(routing_mode == RMODE_ROUTER)
+               overwrite_mac = true;
+
+       return true;
+}
+
+void close_device(void) {
+       if(conn)
+               plug.vde_close(conn);
+
+       if(plug.dl_handle)
+               libvdeplug_dynclose(plug);
+
+       free(device);
+
+       free(iface);
+}
+
+bool read_packet(vpn_packet_t *packet) {
+       int lenin = plug.vde_recv(conn, packet->data, MTU, 0);
+       if(lenin <= 0) {
+               logger(LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno));
+               running = false;
+               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;
+}
+
+bool write_packet(vpn_packet_t *packet) {
+       if(plug.vde_send(conn, packet->data, packet->len, 0) < 0) {
+               if(errno != EINTR && errno != EAGAIN) {
+                       logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
+                       running = false;
+               }
+
+               return false;
+       }
+
+       device_total_out += packet->len;
+
+       return true;
+}
+
+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);
+}