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authorMatthias Schiffer <mschiffer@universe-factory.net>2013-08-07 04:56:51 +0200
committerMatthias Schiffer <mschiffer@universe-factory.net>2013-08-07 05:00:37 +0200
commite3877b11034409b49d7ba42e861bf61fb0c73a06 (patch)
treec1c88e5dd4aba2b50c2387b4997e80d3ac9ee3df /src/tuntap.c
parent6662ce280f002881e07d4ac5bc1a8fd5786a304c (diff)
downloadfastd-e3877b11034409b49d7ba42e861bf61fb0c73a06.tar
fastd-e3877b11034409b49d7ba42e861bf61fb0c73a06.zip
Move tun/tap initialization to a dedicated source file
Diffstat (limited to 'src/tuntap.c')
-rw-r--r--src/tuntap.c90
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);
+}