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author | Matthias Schiffer <mschiffer@universe-factory.net> | 2013-08-07 04:56:51 +0200 |
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committer | Matthias Schiffer <mschiffer@universe-factory.net> | 2013-08-07 05:00:37 +0200 |
commit | e3877b11034409b49d7ba42e861bf61fb0c73a06 (patch) | |
tree | c1c88e5dd4aba2b50c2387b4997e80d3ac9ee3df /src/tuntap.c | |
parent | 6662ce280f002881e07d4ac5bc1a8fd5786a304c (diff) | |
download | fastd-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.c | 90 |
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); +} |