1 files changed, 90 insertions, 0 deletions
diff --git a/src/tuntap.c b/src/tuntap.c
new file mode 100644
index 0000000..6d809c0
--- /dev/null
+++ b/src/tuntap.c
@@ -0,0 +1,90 @@
+/*
+  Copyright (c) 2012-2013, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#include "fastd.h"
+
+#include <fcntl.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+
+#include <linux/if_tun.h>
+
+
+void fastd_tuntap_open(fastd_context_t *ctx) {
+	struct ifreq ifr = {};
+
+	pr_debug(ctx, "initializing tun/tap device...");
+
+	if ((ctx->tunfd = open("/dev/net/tun", O_RDWR|O_CLOEXEC|O_NONBLOCK)) < 0)
+		exit_errno(ctx, "could not open tun/tap device file");
+
+	if (ctx->conf->ifname)
+		strncpy(ifr.ifr_name, ctx->conf->ifname, IFNAMSIZ-1);
+
+	switch (ctx->conf->mode) {
+	case MODE_TAP:
+		ifr.ifr_flags = IFF_TAP;
+		break;
+
+	case MODE_TUN:
+		ifr.ifr_flags = IFF_TUN;
+		break;
+
+	default:
+		exit_bug(ctx, "invalid mode");
+	}
+
+	ifr.ifr_flags |= IFF_NO_PI;
+	if (ioctl(ctx->tunfd, TUNSETIFF, &ifr) < 0)
+		exit_errno(ctx, "TUNSETIFF ioctl failed");
+
+	ctx->ifname = strndup(ifr.ifr_name, IFNAMSIZ-1);
+
+	int ctl_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
+	if (ctl_sock < 0)
+		exit_errno(ctx, "socket");
+
+	if (ioctl(ctl_sock, SIOCGIFMTU, &ifr) < 0)
+		exit_errno(ctx, "SIOCGIFMTU ioctl failed");
+
+	if (ifr.ifr_mtu != ctx->conf->mtu) {
+		ifr.ifr_mtu = ctx->conf->mtu;
+		if (ioctl(ctl_sock, SIOCSIFMTU, &ifr) < 0)
+			exit_errno(ctx, "SIOCSIFMTU ioctl failed");
+	}
+
+	if (close(ctl_sock))
+		pr_error_errno(ctx, "close");
+
+	pr_debug(ctx, "tun/tap device initialized.");
+}
+
+void fastd_tuntap_close(fastd_context_t *ctx) {
+	if (close(ctx->tunfd))
+		pr_warn_errno(ctx, "closing tun/tap: close");
+
+	free(ctx->ifname);
+}