diff options
Diffstat (limited to 'src/network/networkd-tuntap.c')
| -rw-r--r-- | src/network/networkd-tuntap.c | 157 |
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); +} |