-/*-*- 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-netdev-tuntap.h"
-
-#define TUN_DEV "/dev/net/tun"
-
-static int netdev_fill_tuntap_message(NetDev *netdev, struct ifreq *ifr) {
- TunTap *t;
-
- assert(netdev);
- assert(netdev->ifname);
- assert(ifr);
-
- if (netdev->kind == NETDEV_KIND_TAP) {
- t = TAP(netdev);
- ifr->ifr_flags |= IFF_TAP;
- } else {
- t = TUN(netdev);
- ifr->ifr_flags |= IFF_TUN;
- }
-
- if (!t->packet_info)
- ifr->ifr_flags |= IFF_NO_PI;
-
- if (t->one_queue)
- ifr->ifr_flags |= IFF_ONE_QUEUE;
-
- if (t->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;
- TunTap *t = NULL;
- const char *user;
- const char *group;
- uid_t uid;
- gid_t gid;
- int r;
-
- assert(netdev);
- assert(ifr);
-
- fd = open(TUN_DEV, O_RDWR);
- if (fd < 0) {
- log_netdev_error(netdev, "Failed to open tun dev: %m");
- return -errno;
- }
-
- r = ioctl(fd, TUNSETIFF, ifr);
- if (r < 0) {
- log_netdev_error(netdev,
- "TUNSETIFF failed on tun dev: %s",
- strerror(-r));
- return r;
- }
-
- if (netdev->kind == NETDEV_KIND_TAP)
- t = TAP(netdev);
- else
- t = TUN(netdev);
-
- assert(t);
-
- if(t->user_name) {
-
- user = t->user_name;
-
- r = get_user_creds(&user, &uid, NULL, NULL, NULL);
- if (r < 0) {
- log_error_errno(r, "Cannot resolve user name %s: %m",
- t->user_name);
- return 0;
- }
-
- r = ioctl(fd, TUNSETOWNER, uid);
- if ( r < 0) {
- log_netdev_error(netdev,
- "TUNSETOWNER failed on tun dev: %s",
- strerror(-r));
- }
- }
-
- if(t->group_name) {
-
- group = t->group_name;
-
- r = get_group_creds(&group, &gid);
- if (r < 0) {
- log_error_errno(r, "Cannot resolve group name %s: %m",
- t->group_name);
- return 0;
- }
-
- r = ioctl(fd, TUNSETGROUP, gid);
- if( r < 0) {
- log_netdev_error(netdev,
- "TUNSETGROUP failed on tun dev: %s",
- strerror(-r));
- return r;
- }
-
- }
-
- r = ioctl(fd, TUNSETPERSIST, 1);
- if (r < 0) {
- log_netdev_error(netdev,
- "TUNSETPERSIST failed on tun dev: %s",
- strerror(-r));
- return r;
- }
-
- return 0;
-}
-
-static int netdev_create_tuntap(NetDev *netdev) {
- struct ifreq ifr = {};
- int r;
-
- r = netdev_fill_tuntap_message(netdev, &ifr);
- if(r < 0)
- return r;
-
- return netdev_tuntap_add(netdev, &ifr);
-}
-
-static void tuntap_done(NetDev *netdev) {
- TunTap *t = NULL;
-
- assert(netdev);
-
- if (netdev->kind == NETDEV_KIND_TUN)
- t = TUN(netdev);
- else
- t = TAP(netdev);
-
- assert(t);
-
- free(t->user_name);
- t->user_name = NULL;
-
- free(t->group_name);
- t->group_name = NULL;
-}
-
-static int tuntap_verify(NetDev *netdev, const char *filename) {
- assert(netdev);
-
- if (netdev->mtu) {
- log_warning_netdev(netdev, "MTU configured for %s, ignoring",
- netdev_kind_to_string(netdev->kind));
- }
-
- if (netdev->mac) {
- log_warning_netdev(netdev, "MAC configured for %s, ignoring",
- netdev_kind_to_string(netdev->kind));
- }
-
- return 0;
-}
-
-const NetDevVTable tun_vtable = {
- .object_size = sizeof(TunTap),
- .sections = "Match\0NetDev\0Tun\0",
- .config_verify = tuntap_verify,
- .done = tuntap_done,
- .create = netdev_create_tuntap,
- .create_type = NETDEV_CREATE_INDEPENDENT,
-};
-
-const NetDevVTable tap_vtable = {
- .object_size = sizeof(TunTap),
- .sections = "Match\0NetDev\0Tap\0",
- .config_verify = tuntap_verify,
- .done = tuntap_done,
- .create = netdev_create_tuntap,
- .create_type = NETDEV_CREATE_INDEPENDENT,
-};
~ianmdlvl / elogind.git / blobdiff