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authorSusant Sahani <susant@redhat.com>2014-07-03 13:34:11 +0530
committerTom Gundersen <teg@jklm.no>2014-07-03 11:00:02 +0200
commit30ae9dfda3788cdfaf1b84d124dbc7feb638c77b (patch)
tree854a45b96eb6cd48b9b2caed95a1ecb23de7b2ed /src/network/networkd-tuntap.c
parent866ee3682213789f85b877700457fdca05695a0e (diff)
networkd: Introduce tun/tap device
This patch introduces TUN/TAP device creation support to networkd. Example conf to create a tap device: file: tap.netdev ------------------ [NetDev] Name=tap-test Kind=tap [Tap] OneQueue=true MultiQueue=true PacketInfo=true User=sus Group=sus ------------------ Test: 1. output of ip link tap-test: tap pi one_queue UNKNOWN_FLAGS:900 user 1000 group 1000 id: uid=1000(sus) gid=10(wheel) groups=10(wheel),1000(sus) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 Modifications: Added: 1. file networkd-tuntap.c 3. netdev kind NETDEV_KIND_TUN and NETDEV_KIND_TAP 2. Tun and Tap Sections and config params to parse conf and gperf conf parameters [tomegun: tweak the 'kind' checking for received ifindex]
Diffstat (limited to 'src/network/networkd-tuntap.c')
-rw-r--r--src/network/networkd-tuntap.c157
1 files changed, 157 insertions, 0 deletions
diff --git a/src/network/networkd-tuntap.c b/src/network/networkd-tuntap.c
new file mode 100644
index 0000000000..19dc2ad252
--- /dev/null
+++ b/src/network/networkd-tuntap.c
@@ -0,0 +1,157 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2014 Susant Sahani <susant@redhat.com>
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <linux/if_tun.h>
+
+#include "networkd.h"
+
+#define TUN_DEV "/dev/net/tun"
+
+
+static int netdev_fill_tuntap_message(NetDev *netdev, struct ifreq *ifr) {
+
+ assert(netdev);
+ assert(ifr);
+
+ memset(ifr, 0, sizeof(*ifr));
+
+ if (netdev->kind != NETDEV_KIND_TAP)
+ ifr->ifr_flags |= IFF_TUN;
+ else
+ ifr->ifr_flags |= IFF_TAP;
+
+ if (netdev->packet_info)
+ ifr->ifr_flags &= ~IFF_NO_PI;
+ else
+ ifr->ifr_flags |= IFF_NO_PI;
+
+ if (netdev->one_queue)
+ ifr->ifr_flags |= IFF_ONE_QUEUE;
+
+ if (netdev->multi_queue)
+ ifr->ifr_flags |= IFF_MULTI_QUEUE;
+
+ strncpy(ifr->ifr_name, netdev->ifname, IFNAMSIZ-1);
+
+ return 0;
+}
+
+static int netdev_tuntap_add(NetDev *netdev, struct ifreq *ifr) {
+ _cleanup_close_ int fd;
+ const char *user;
+ const char *group;
+ uid_t uid;
+ gid_t gid;
+ int r = 0;
+
+ fd = open(TUN_DEV, O_RDWR);
+ if (fd < 0) {
+ log_error_netdev(netdev,
+ "Failed to open tun dev: %s",
+ strerror(-r));
+ return r;
+ }
+
+ r = ioctl(fd, TUNSETIFF, ifr);
+ if (r < 0) {
+ log_error_netdev(netdev,
+ "TUNSETIFF failed on tun dev: %s",
+ strerror(-r));
+ return r;
+ }
+
+ if(netdev->user_name) {
+
+ user = netdev->user_name;
+
+ r = get_user_creds(&user, &uid, NULL, NULL, NULL);
+ if (r < 0) {
+ log_error("Cannot resolve user name %s: %s",
+ netdev->user_name, strerror(-r));
+ return 0;
+ }
+
+ r = ioctl(fd, TUNSETOWNER, uid);
+ if ( r < 0) {
+ log_error_netdev(netdev,
+ "TUNSETOWNER failed on tun dev: %s",
+ strerror(-r));
+ }
+ }
+
+ if(netdev->group_name) {
+
+ group = netdev->group_name;
+
+ r = get_group_creds(&group, &gid);
+ if (r < 0) {
+ log_error("Cannot resolve group name %s: %s",
+ netdev->group_name, strerror(-r));
+ return 0;
+ }
+
+ r = ioctl(fd, TUNSETGROUP, gid);
+ if( r < 0) {
+ log_error_netdev(netdev,
+ "TUNSETGROUP failed on tun dev: %s",
+ strerror(-r));
+ return r;
+ }
+
+ }
+
+ r = ioctl(fd, TUNSETPERSIST, 1);
+ if (r < 0) {
+ log_error_netdev(netdev,
+ "TUNSETPERSIST failed on tun dev: %s",
+ strerror(-r));
+ return r;
+ }
+
+ return r;
+}
+
+int netdev_create_tuntap(NetDev *netdev) {
+ struct ifreq ifr;
+ int r;
+
+ assert(netdev);
+ assert(netdev->ifname);
+
+ switch(netdev->kind) {
+ case NETDEV_KIND_TUN:
+ case NETDEV_KIND_TAP:
+ break;
+ default:
+ return -ENOTSUP;
+ }
+
+ r = netdev_fill_tuntap_message(netdev, &ifr);
+ if(r < 0)
+ return r;
+
+ log_debug_netdev(netdev, "Creating tuntap netdev: %s",
+ netdev_kind_to_string(netdev->kind));
+
+ return netdev_tuntap_add(netdev, &ifr);
+}