Re: [libvirt] [PATCH 4/5] macvtap support for libvirt -- helper code

This part adds the helper code to setup and tear down macvtap devices using direct communication with the device driver via netlink sockets. Signed-off-by: Stefan Berger <stefanb(a)us.ibm.com&gt;

Index: libvirt-macvtap/src/util/macvtap.h =================================================================== --- /dev/null +++ libvirt-macvtap/src/util/macvtap.h @@ -0,0 +1,49 @@ +/* + * Copyright (C) 2010 IBM Corporation + * + * This library 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. + * + * This library 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 this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Authors: + * Stefan Berger <stefanb(a)us.ibm.com&gt; + */ + +#ifndef __UTIL_MACVTAP_H__ +#define __UTIL_MACVTAP_H__ + +#include <config.h> + +#if defined(WITH_MACVTAP) + +#include "internal.h" + +int openMacvtapTap(virConnectPtr conn, + const char *ifname, + const unsigned char *macaddress, + const char *linkdev, + const char *mode, + char **res_ifname);

+ +int delMacvtapByMACAddress(virConnectPtr conn, + const unsigned char *macaddress, + int *hasBusyDev); + +#endif /* WITH_MACVTAP */ + +#define MACVTAP_MODE_PRIVATE_STR "private" +#define MACVTAP_MODE_VEPA_STR "vepa" +#define MACVTAP_MODE_BRIDGE_STR "bridge"

+ +static uint32_t +modeFromString(const char *mode_str) +{ + if (!mode_str) + return 0; + if (STREQ(mode_str, MACVTAP_MODE_PRIVATE_STR)) + return MACVLAN_MODE_PRIVATE; + if (STREQ(mode_str, MACVTAP_MODE_VEPA_STR)) + return MACVLAN_MODE_VEPA; + if (STREQ(mode_str, MACVTAP_MODE_BRIDGE_STR)) + return MACVLAN_MODE_BRIDGE; + return 0; +}

+create_name: + retries = 5; + for (c = 0; c < 255; c++) {

+ snprintf(ifname, sizeof(ifname), MACVTAP_NAME_PATTERN, c); + if (getIfIndex(NULL, ifname, &ifindex) == ENODEV) { + rc = link_add(conn, type, macaddress, 6, ifname, linkdev, + mode, &do_retry); + if (rc == 0) + break; + + if (do_retry && --retries) + continue; + return -1; + } + } + cr_ifname = ifname; + } + + rc = ifUp(cr_ifname, 1); + if (rc != 0) { + virReportSystemError(conn, errno, + _("cannot 'up' interface %s"), cr_ifname); + rc = -1; + goto link_del_exit; + } + + rc = openTap(conn, cr_ifname, 10); + + if (rc > 0) + *res_ifname = strdup(cr_ifname); + else + goto link_del_exit; + + return rc; + +link_del_exit: + link_del(conn, type, ifname); + + return rc; +}