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; if (t->vnet_hdr) ifr->ifr_flags |= IFF_VNET_HDR; 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) return log_netdev_error_errno(netdev, -errno, "Failed to open tun dev: %m"); r = ioctl(fd, TUNSETIFF, ifr); if (r < 0) return log_netdev_error_errno(netdev, -errno, "TUNSETIFF failed on tun dev: %m"); 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) return log_netdev_error_errno(netdev, r, "Cannot resolve user name %s: %m", t->user_name); r = ioctl(fd, TUNSETOWNER, uid); if (r < 0) return log_netdev_error_errno(netdev, -errno, "TUNSETOWNER failed on tun dev: %m"); } if (t->group_name) { group = t->group_name; r = get_group_creds(&group, &gid); if (r < 0) return log_netdev_error_errno(netdev, r, "Cannot resolve group name %s: %m", t->group_name); r = ioctl(fd, TUNSETGROUP, gid); if (r < 0) return log_netdev_error_errno(netdev, -errno, "TUNSETGROUP failed on tun dev: %m"); } r = ioctl(fd, TUNSETPERSIST, 1); if (r < 0) return log_netdev_error_errno(netdev, -errno, "TUNSETPERSIST failed on tun dev: %m"); return 0; }
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); t->user_name = mfree(t->user_name); t->group_name = mfree(t->group_name); }