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Split bridge.h into three separate files

Browse Source 
Following the renaming of the bridge management APIs, we can now
split the source file into 3 corresponding pieces

 * src/util/virnetdev.c: APIs for any type of network interface
 * src/util/virnetdevbridge.c: APIs for bridge interfaces
 * src/util/virnetdevtap.c: APIs for TAP interfaces

* src/util/virnetdev.c, src/util/virnetdev.h,
  src/util/virnetdevbridge.c, src/util/virnetdevbridge.h,
  src/util/virnetdevtap.c, src/util/virnetdevtap.h: Copied
  from bridge.{c,h}
* src/util/bridge.c, src/util/bridge.h: Split into 3 pieces
* src/lxc/lxc_driver.c, src/network/bridge_driver.c,
  src/openvz/openvz_driver.c, src/qemu/qemu_command.c,
  src/qemu/qemu_conf.h, src/uml/uml_conf.c, src/uml/uml_conf.h,
  src/uml/uml_driver.c: Update #include directives
This commit is contained in:
Daniel P. Berrange 2011-11-02 13:41:58 +00:00
parent c1df2c14b5
commit e49c9bf25c
19 changed files with 1530 additions and 1254 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
configure.ac
View File

@ -150,7 +150,8 @@ LIBS=$old_libs
dnl Availability of various common headers (non-fatal if missing). dnl Availability of various common headers (non-fatal if missing).
AC_CHECK_HEADERS([pwd.h paths.h regex.h sys/un.h \ AC_CHECK_HEADERS([pwd.h paths.h regex.h sys/un.h \
sys/poll.h syslog.h mntent.h net/ethernet.h linux/magic.h \ sys/poll.h syslog.h mntent.h net/ethernet.h linux/magic.h \
sys/un.h sys/syscall.h netinet/tcp.h ifaddrs.h libtasn1.h]) sys/un.h sys/syscall.h netinet/tcp.h ifaddrs.h libtasn1.h \
net/if.h])
dnl Our only use of libtasn1.h is in the testsuite, and can be skipped dnl Our only use of libtasn1.h is in the testsuite, and can be skipped
dnl if the header is not present. Assume -ltasn1 is present if the dnl if the header is not present. Assume -ltasn1 is present if the

4
po/POTFILES.in
View File

@ -102,7 +102,6 @@ src/test/test_driver.c
src/uml/uml_conf.c src/uml/uml_conf.c
src/uml/uml_driver.c src/uml/uml_driver.c
src/util/authhelper.c src/util/authhelper.c
src/util/bridge.c
src/util/cgroup.c src/util/cgroup.c
src/util/command.c src/util/command.c
src/util/conf.c src/util/conf.c
@ -127,6 +126,9 @@ src/util/sysinfo.c
src/util/util.c src/util/util.c
src/util/viraudit.c src/util/viraudit.c
src/util/virfile.c src/util/virfile.c
src/util/virnetdev.c
src/util/virnetdevbridge.c
src/util/virnetdevtap.c
src/util/virpidfile.c src/util/virpidfile.c
src/util/virterror.c src/util/virterror.c
src/util/xml.c src/util/xml.c

6
src/Makefile.am
View File

@ -54,7 +54,6 @@ augeastest_DATA =
UTIL_SOURCES = \ UTIL_SOURCES = \
util/authhelper.c util/authhelper.h \ util/authhelper.c util/authhelper.h \
util/bitmap.c util/bitmap.h \ util/bitmap.c util/bitmap.h \
util/bridge.c util/bridge.h \
util/buf.c util/buf.h \ util/buf.c util/buf.h \
util/command.c util/command.h \ util/command.c util/command.h \
util/conf.c util/conf.h \ util/conf.c util/conf.h \
@ -93,7 +92,10 @@ UTIL_SOURCES = \
util/xml.c util/xml.h \ util/xml.c util/xml.h \
util/virterror.c util/virterror_internal.h \ util/virterror.c util/virterror_internal.h \
util/virkeycode.c util/virkeycode.h \ util/virkeycode.c util/virkeycode.h \
util/virkeymaps.h util/virkeymaps.h \
util/virnetdev.h util/virnetdev.c \
util/virnetdevbridge.h util/virnetdevbridge.c \
util/virnetdevtap.h util/virnetdevtap.c
EXTRA_DIST += $(srcdir)/util/virkeymaps.h $(srcdir)/util/keymaps.csv \ EXTRA_DIST += $(srcdir)/util/virkeymaps.h $(srcdir)/util/keymaps.csv \
$(srcdir)/util/virkeycode-mapgen.py $(srcdir)/util/virkeycode-mapgen.py

2
src/lxc/lxc_driver.c
View File

@ -43,7 +43,7 @@
#include "lxc_driver.h" #include "lxc_driver.h"
#include "memory.h" #include "memory.h"
#include "util.h" #include "util.h"
#include "bridge.h" #include "virnetdevbridge.h"
#include "veth.h" #include "veth.h"
#include "nodeinfo.h" #include "nodeinfo.h"
#include "uuid.h" #include "uuid.h"

5
src/network/bridge_driver.c
View File

@ -42,6 +42,7 @@
#include <stdio.h> #include <stdio.h>
#include <sys/wait.h> #include <sys/wait.h>
#include <sys/ioctl.h> #include <sys/ioctl.h>
#include <net/if.h>
#include "virterror_internal.h" #include "virterror_internal.h"
#include "datatypes.h" #include "datatypes.h"
@ -55,13 +56,15 @@
#include "memory.h" #include "memory.h"
#include "uuid.h" #include "uuid.h"
#include "iptables.h" #include "iptables.h"
#include "bridge.h"
#include "interface.h" #include "interface.h"
#include "logging.h" #include "logging.h"
#include "dnsmasq.h" #include "dnsmasq.h"
#include "util/network.h" #include "util/network.h"
#include "configmake.h" #include "configmake.h"
#include "ignore-value.h" #include "ignore-value.h"
#include "virnetdev.h"
#include "virnetdevbridge.h"
#include "virnetdevtap.h"
#define NETWORK_PID_DIR LOCALSTATEDIR "/run/libvirt/network" #define NETWORK_PID_DIR LOCALSTATEDIR "/run/libvirt/network"
#define NETWORK_STATE_DIR LOCALSTATEDIR "/lib/libvirt/network" #define NETWORK_STATE_DIR LOCALSTATEDIR "/lib/libvirt/network"

1
src/openvz/openvz_driver.c
View File

@ -54,7 +54,6 @@
#include "openvz_conf.h" #include "openvz_conf.h"
#include "nodeinfo.h" #include "nodeinfo.h"
#include "memory.h" #include "memory.h"
#include "bridge.h"
#include "virfile.h" #include "virfile.h"
#include "logging.h" #include "logging.h"
#include "command.h" #include "command.h"

1
src/qemu/qemu_command.c
View File

@ -38,6 +38,7 @@
#include "domain_audit.h" #include "domain_audit.h"
#include "domain_conf.h" #include "domain_conf.h"
#include "network/bridge_driver.h" #include "network/bridge_driver.h"
#include "virnetdevtap.h"
#include <sys/utsname.h> #include <sys/utsname.h>
#include <sys/stat.h> #include <sys/stat.h>

1
src/qemu/qemu_conf.h
View File

@ -28,7 +28,6 @@
# include "ebtables.h" # include "ebtables.h"
# include "internal.h" # include "internal.h"
# include "bridge.h"
# include "capabilities.h" # include "capabilities.h"
# include "network_conf.h" # include "network_conf.h"
# include "domain_conf.h" # include "domain_conf.h"

2
src/uml/uml_conf.c
View File

@ -43,11 +43,11 @@
#include "util.h" #include "util.h"
#include "memory.h" #include "memory.h"
#include "nodeinfo.h" #include "nodeinfo.h"
#include "bridge.h"
#include "logging.h" #include "logging.h"
#include "domain_nwfilter.h" #include "domain_nwfilter.h"
#include "virfile.h" #include "virfile.h"
#include "command.h" #include "command.h"
#include "virnetdevtap.h"
#define VIR_FROM_THIS VIR_FROM_UML #define VIR_FROM_THIS VIR_FROM_UML

1
src/uml/uml_conf.h
View File

@ -25,7 +25,6 @@
# define __UML_CONF_H # define __UML_CONF_H
# include "internal.h" # include "internal.h"
# include "bridge.h"
# include "capabilities.h" # include "capabilities.h"
# include "network_conf.h" # include "network_conf.h"
# include "domain_conf.h" # include "domain_conf.h"

1
src/uml/uml_driver.c
View File

@ -62,6 +62,7 @@
#include "virfile.h" #include "virfile.h"
#include "fdstream.h" #include "fdstream.h"
#include "configmake.h" #include "configmake.h"
#include "virnetdevtap.h"
#define VIR_FROM_THIS VIR_FROM_UML #define VIR_FROM_THIS VIR_FROM_UML

1115
src/util/bridge.c
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File diff suppressed because it is too large Load Diff

129
src/util/bridge.h
View File

@ -1,129 +0,0 @@
/*
* Copyright (C) 2007 Red Hat, Inc.
*
* 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:
* Mark McLoughlin <markmc@redhat.com>
*/
#ifndef __QEMUD_BRIDGE_H__
# define __QEMUD_BRIDGE_H__
# include <config.h>
# if defined(WITH_BRIDGE)
# include <net/if.h>
# include <netinet/in.h>
# include "network.h"
/**
* BR_IFNAME_MAXLEN:
* maximum size in byte of the name for an interface
*/
# define BR_IFNAME_MAXLEN IF_NAMESIZE
/**
* BR_INET_ADDR_MAXLEN:
* maximum size in bytes for an inet addess name
*/
# define BR_INET_ADDR_MAXLEN INET_ADDRSTRLEN
int virNetDevBridgeCreate(const char *brname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevBridgeDelete(const char *brname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevExists(const char *brname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevBridgeAddPort(const char *brname,
const char *ifname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevBridgeRemovePort(const char *brname,
const char *ifname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
enum {
BR_TAP_VNET_HDR = (1 << 0),
BR_TAP_PERSIST = (1 << 1),
};
int virNetDevTapCreateInBridgePort(const char *brname,
char **ifname,
const unsigned char *macaddr,
int vnet_hdr,
bool up,
int *tapfd)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
ATTRIBUTE_RETURN_CHECK;
int virNetDevTapDelete(const char *ifname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevSetOnline(const char *ifname,
bool online)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevIsOnline(const char *ifname,
bool *online)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevSetIPv4Address(const char *ifname,
virSocketAddr *addr,
unsigned int prefix)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevClearIPv4Address(const char *ifname,
virSocketAddr *addr,
unsigned int prefix)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevBridgeSetSTPDelay(const char *brname,
int delay)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevBridgeGetSTPDelay(const char *brname,
int *delay)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevBridgeSetSTP(const char *brname,
bool enable)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevBridgeGetSTP(const char *brname,
bool *enable)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevTapCreate(char **ifname,
int vnet_hdr,
int *tapfd)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevSetMAC(const char *ifname,
const unsigned char *macaddr)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevGetMAC(const char *ifname,
unsigned char *macaddr)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevSetMTU(const char *ifname,
int mtu)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevSetMTUFromDevice(const char *ifname,
const char *otherifname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevGetMTU(const char *ifname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
# endif /* WITH_BRIDGE */
#endif /* __QEMUD_BRIDGE_H__ */

524
src/util/virnetdev.c Normal file
View File

@ -0,0 +1,524 @@
/*
* Copyright (C) 2007-2011 Red Hat, Inc.
*
* 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:
* Mark McLoughlin <markmc@redhat.com>
* Daniel P. Berrange <berrange@redhat.com>
*/
#include <config.h>
#include "virnetdev.h"
#include "virfile.h"
#include "virterror_internal.h"
#include "command.h"
#include "memory.h"
#include <sys/ioctl.h>
#ifdef HAVE_NET_IF_H
# include <net/if.h>
#endif
#define VIR_FROM_THIS VIR_FROM_NONE
#ifdef HAVE_NET_IF_H
static int virNetDevSetupControlFull(const char *ifname,
struct ifreq *ifr,
int domain,
int type)
{
int fd;
memset(ifr, 0, sizeof(*ifr));
if (virStrcpyStatic(ifr->ifr_name, ifname) == NULL) {
virReportSystemError(ERANGE,
_("Network interface name '%s' is too long"),
ifname);
return -1;
}
if ((fd = socket(domain, type, 0)) < 0) {
virReportSystemError(errno, "%s",
_("Cannot open network interface control socket"));
return -1;
}
if (virSetInherit(fd, false) < 0) {
virReportSystemError(errno, "%s",
_("Cannot set close-on-exec flag for socket"));
VIR_FORCE_CLOSE(fd);
return -1;
}
return fd;
}
static int virNetDevSetupControl(const char *ifname,
struct ifreq *ifr)
{
return virNetDevSetupControlFull(ifname, ifr, AF_PACKET, SOCK_DGRAM);
}
#endif
#ifdef SIOCGIFFLAGS
/**
* virNetDevExists:
* @ifname
*
* Check if the network device @ifname exists
*
* Returns 1 if it exists, 0 if it does not, -1 on error
*/
int virNetDevExists(const char *ifname)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(ifname, &ifr)) < 0)
return -1;
if (ioctl(fd, SIOCGIFFLAGS, &ifr)) {
if (errno == ENODEV)
ret = 0;
else
virReportSystemError(errno,
_("Unable to check interface flags for %s"), ifname);
goto cleanup;
}
ret = 1;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else
int virNetDevExists(const char *ifname)
{
virReportSystemError(ENOSYS,
_("Unable to check interface %s"), ifname);
return -1;
}
#endif
#ifdef SIOCGIFHWADDR
/**
* virNetDevSetMAC:
* @ifname: interface name to set MTU for
* @macaddr: MAC address (VIR_MAC_BUFLEN in size)
*
* This function sets the @macaddr for a given interface @ifname. This
* gets rid of the kernel's automatically assigned random MAC.
*
* Returns 0 in case of success or -1 on failure
*/
int virNetDevSetMAC(const char *ifname,
const unsigned char *macaddr)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(ifname, &ifr)) < 0)
return -1;
/* To fill ifr.ifr_hdaddr.sa_family field */
if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
virReportSystemError(errno,
_("Cannot get interface MAC on '%s'"),
ifname);
goto cleanup;
}
memcpy(ifr.ifr_hwaddr.sa_data, macaddr, VIR_MAC_BUFLEN);
if (ioctl(fd, SIOCSIFHWADDR, &ifr) < 0) {
virReportSystemError(errno,
_("Cannot set interface MAC on '%s'"),
ifname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else
int virNetDevSetMAC(const char *ifname,
const unsigned char *macaddr ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Cannot set interface MAC on '%s'"),
ifname);
return -1;
}
#endif
#ifdef SIOCGIFHWADDR
/**
* virNetDevGetMAC:
* @ifname: interface name to set MTU for
* @macaddr: MAC address (VIR_MAC_BUFLEN in size)
*
* This function gets the @macaddr for a given interface @ifname.
*
* Returns 0 in case of success or -1 on failure
*/
int virNetDevGetMAC(const char *ifname,
unsigned char *macaddr)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(ifname, &ifr)) < 0)
return -1;
if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
virReportSystemError(errno,
_("Cannot get interface MAC on '%s'"),
ifname);
goto cleanup;
}
memcpy(macaddr, ifr.ifr_hwaddr.sa_data, VIR_MAC_BUFLEN);
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else
int virNetDevGetMAC(const char *ifname,
unsigned char *macaddr ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Cannot get interface MAC on '%s'"),
ifname);
return -1;
}
#endif
#ifdef SIOCGIFMTU
/**
* virNetDevGetMTU:
* @ifname: interface name get MTU for
*
* This function gets the @mtu value set for a given interface @ifname.
*
* Returns the MTU value in case of success, or -1 on failure.
*/
int virNetDevGetMTU(const char *ifname)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(ifname, &ifr)) < 0)
return -1;
if (ioctl(fd, SIOCGIFMTU, &ifr) < 0) {
virReportSystemError(errno,
_("Cannot get interface MTU on '%s'"),
ifname);
goto cleanup;
}
ret = ifr.ifr_mtu;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else
int virNetDevGetMTU(const char *ifname)
{
virReportSystemError(ENOSYS,
_("Cannot get interface MTU on '%s'"),
ifname);
return -1;
}
#endif
#ifdef SIOCSIFMTU
/**
* virNetDevSetMTU:
* @ifname: interface name to set MTU for
* @mtu: MTU value
*
* This function sets the @mtu for a given interface @ifname. Typically
* used on a tap device to set up for Jumbo Frames.
*
* Returns 0 in case of success, or -1 on failure
*/
int virNetDevSetMTU(const char *ifname, int mtu)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(ifname, &ifr)) < 0)
return -1;
ifr.ifr_mtu = mtu;
if (ioctl(fd, SIOCSIFMTU, &ifr) < 0) {
virReportSystemError(errno,
_("Cannot set interface MTU on '%s'"),
ifname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else
int virNetDevSetMTU(const char *ifname, int mtu ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Cannot set interface MTU on '%s'"),
ifname);
return -1;
}
#endif
/**
* virNetDevSetMTUFromDevice:
* @ifname: name of the interface whose MTU we want to set
* @otherifname: name of the interface whose MTU we want to copy
*
* Sets the interface mtu to the same MTU as another interface
*
* Returns 0 in case of success, or -1 on failure
*/
int virNetDevSetMTUFromDevice(const char *ifname,
const char *otherifname)
{
int mtu = virNetDevGetMTU(otherifname);
if (mtu < 0)
return -1;
return virNetDevSetMTU(ifname, mtu);
}
#ifdef SIOCSIFFLAGS
/**
* virNetDevSetOnline:
* @ifname: the interface name
* @online: true for up, false for down
*
* Function to control if an interface is activated (up, true) or not (down, false)
*
* Returns 0 in case of success or -1 on error.
*/
int virNetDevSetOnline(const char *ifname,
bool online)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
int ifflags;
if ((fd = virNetDevSetupControl(ifname, &ifr)) < 0)
return -1;
if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
virReportSystemError(errno,
_("Cannot get interface flags on '%s'"),
ifname);
goto cleanup;
}
if (online)
ifflags = ifr.ifr_flags | IFF_UP;
else
ifflags = ifr.ifr_flags & ~IFF_UP;
if (ifr.ifr_flags != ifflags) {
ifr.ifr_flags = ifflags;
if (ioctl(fd, SIOCSIFFLAGS, &ifr) < 0) {
virReportSystemError(errno,
_("Cannot set interface flags on '%s'"),
ifname);
goto cleanup;
}
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else
int virNetDevSetOnline(const char *ifname,
bool online ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Cannot set interface flags on '%s'"),
ifname);
return -1;
}
#endif
#ifdef SIOCGIFFLAGS
/**
* virNetDevIsOnline:
* @ifname: the interface name
* @online: where to store the status
*
* Function to query if an interface is activated (true) or not (false)
*
* Returns 0 in case of success or an errno code in case of failure.
*/
int virNetDevIsOnline(const char *ifname,
bool *online)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(ifname, &ifr)) < 0)
return -1;
if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
virReportSystemError(errno,
_("Cannot get interface flags on '%s'"),
ifname);
goto cleanup;
}
*online = (ifr.ifr_flags & IFF_UP) ? true : false;
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else
int virNetDevIsOnline(const char *ifname,
bool *online ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Cannot get interface flags on '%s'"),
ifname);
return -1;
}
#endif
/**
* virNetDevSetIPv4Address:
* @ifname: the interface name
* @addr: the IP address (IPv4 or IPv6)
* @prefix: number of 1 bits in the netmask
*
* Add an IP address to an interface. This function *does not* remove
* any previously added IP addresses - that must be done separately with
* brDelInetAddress.
*
* Returns 0 in case of success or -1 in case of error.
*/
int virNetDevSetIPv4Address(const char *ifname,
virSocketAddr *addr,
unsigned int prefix)
{
virCommandPtr cmd = NULL;
char *addrstr = NULL, *bcaststr = NULL;
virSocketAddr broadcast;
int ret = -1;
if (!(addrstr = virSocketFormatAddr(addr)))
goto cleanup;
/* format up a broadcast address if this is IPv4 */
if ((VIR_SOCKET_IS_FAMILY(addr, AF_INET)) &&
((virSocketAddrBroadcastByPrefix(addr, prefix, &broadcast) < 0) ||
!(bcaststr = virSocketFormatAddr(&broadcast)))) {
goto cleanup;
}
cmd = virCommandNew(IP_PATH);
virCommandAddArgList(cmd, "addr", "add", NULL);
virCommandAddArgFormat(cmd, "%s/%u", addrstr, prefix);
if (bcaststr)
virCommandAddArgList(cmd, "broadcast", bcaststr, NULL);
virCommandAddArgList(cmd, "dev", ifname, NULL);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(addrstr);
VIR_FREE(bcaststr);
virCommandFree(cmd);
return ret;
}
/**
* virNetDevClearIPv4Address:
* @ifname: the interface name
* @addr: the IP address (IPv4 or IPv6)
* @prefix: number of 1 bits in the netmask
*
* Delete an IP address from an interface.
*
* Returns 0 in case of success or -1 in case of error.
*/
int virNetDevClearIPv4Address(const char *ifname,
virSocketAddr *addr,
unsigned int prefix)
{
virCommandPtr cmd = NULL;
char *addrstr;
int ret = -1;
if (!(addrstr = virSocketFormatAddr(addr)))
goto cleanup;
cmd = virCommandNew(IP_PATH);
virCommandAddArgList(cmd, "addr", "del", NULL);
virCommandAddArgFormat(cmd, "%s/%u", addrstr, prefix);
virCommandAddArgList(cmd, "dev", ifname, NULL);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(addrstr);
virCommandFree(cmd);
return ret;
}

63
src/util/virnetdev.h Normal file
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@ -0,0 +1,63 @@
/*
* Copyright (C) 2007-2011 Red Hat, Inc.
*
* 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:
* Mark McLoughlin <markmc@redhat.com>
* Daniel P. Berrange <berrange@redhat.com>
*/
#ifndef __VIR_NETDEV_H__
# define __VIR_NETDEV_H__
# include "network.h"
int virNetDevExists(const char *brname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevSetOnline(const char *ifname,
bool online)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevIsOnline(const char *ifname,
bool *online)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevSetIPv4Address(const char *ifname,
virSocketAddr *addr,
unsigned int prefix)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevClearIPv4Address(const char *ifname,
virSocketAddr *addr,
unsigned int prefix)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevSetMAC(const char *ifname,
const unsigned char *macaddr)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevGetMAC(const char *ifname,
unsigned char *macaddr)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevSetMTU(const char *ifname,
int mtu)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevSetMTUFromDevice(const char *ifname,
const char *otherifname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevGetMTU(const char *ifname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
#endif /* __VIR_NETDEV_H__ */

527
src/util/virnetdevbridge.c Normal file
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@ -0,0 +1,527 @@
/*
* Copyright (C) 2007-2011 Red Hat, Inc.
*
* 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:
* Mark McLoughlin <markmc@redhat.com>
* Daniel P. Berrange <berrange@redhat.com>
*/
#include <config.h>
#include "virnetdevbridge.h"
#include "virterror_internal.h"
#include "util.h"
#include "virfile.h"
#include "memory.h"
#include "intprops.h"
#include <sys/ioctl.h>
#ifdef HAVE_NET_IF_H
# include <net/if.h>
#endif
#ifdef __linux__
# include <linux/sockios.h>
# include <linux/param.h> /* HZ */
# include <linux/if_bridge.h> /* SYSFS_BRIDGE_ATTR */
# define JIFFIES_TO_MS(j) (((j)*1000)/HZ)
# define MS_TO_JIFFIES(ms) (((ms)*HZ)/1000)
#endif
#define VIR_FROM_THIS VIR_FROM_NONE
#ifdef HAVE_NET_IF_H
static int virNetDevSetupControlFull(const char *ifname,
struct ifreq *ifr,
int domain,
int type)
{
int fd;
if (ifname && ifr) {
memset(ifr, 0, sizeof(*ifr));
if (virStrcpyStatic(ifr->ifr_name, ifname) == NULL) {
virReportSystemError(ERANGE,
_("Network interface name '%s' is too long"),
ifname);
return -1;
}
}
if ((fd = socket(domain, type, 0)) < 0) {
virReportSystemError(errno, "%s",
_("Cannot open network interface control socket"));
return -1;
}
if (virSetInherit(fd, false) < 0) {
virReportSystemError(errno, "%s",
_("Cannot set close-on-exec flag for socket"));
VIR_FORCE_CLOSE(fd);
return -1;
}
return fd;
}
static int virNetDevSetupControl(const char *ifname,
struct ifreq *ifr)
{
return virNetDevSetupControlFull(ifname, ifr, AF_PACKET, SOCK_DGRAM);
}
#endif
#ifdef __linux__
# define SYSFS_NET_DIR "/sys/class/net"
/*
* Bridge parameters can be set via sysfs on newish kernels,
* or by ioctl on older kernels. Perhaps we could just use
* ioctl for every kernel, but its not clear what the long
* term lifespan of the ioctl interface is...
*/
static int virNetDevBridgeSet(const char *brname,
const char *paramname, /* sysfs param name */
unsigned long value, /* new value */
int fd, /* control socket */
struct ifreq *ifr) /* pre-filled bridge name */
{
char *path = NULL;
int ret = -1;
if (virAsprintf(&path, "%s/%s/bridge/%s", SYSFS_NET_DIR, brname, paramname) < 0) {
virReportOOMError();
return -1;
}
if (virFileExists(path)) {
char valuestr[INT_BUFSIZE_BOUND(value)];
snprintf(valuestr, sizeof(valuestr), "%lu", value);
if (virFileWriteStr(path, valuestr, 0) < 0) {
virReportSystemError(errno,
_("Unable to set bridge %s %s"), brname, paramname);
goto cleanup;
}
} else {
unsigned long paramid;
if (STREQ(paramname, "stp_state")) {
paramid = BRCTL_SET_BRIDGE_STP_STATE;
} else if (STREQ(paramname, "forward_delay")) {
paramid = BRCTL_SET_BRIDGE_FORWARD_DELAY;
} else {
virReportSystemError(EINVAL,
_("Unable to set bridge %s %s"), brname, paramname);
goto cleanup;
}
unsigned long args[] = { paramid, value, 0, 0 };
ifr->ifr_data = (char*)&args;
if (ioctl(fd, SIOCDEVPRIVATE, ifr) < 0) {
virReportSystemError(errno,
_("Unable to set bridge %s %s"), brname, paramname);
goto cleanup;
}
}
ret = 0;
cleanup:
VIR_FREE(path);
return ret;
}
static int virNetDevBridgeGet(const char *brname,
const char *paramname, /* sysfs param name */
unsigned long *value, /* current value */
int fd, /* control socket */
struct ifreq *ifr) /* pre-filled bridge name */
{
char *path = NULL;
int ret = -1;
if (virAsprintf(&path, "%s/%s/bridge/%s", SYSFS_NET_DIR, brname, paramname) < 0) {
virReportOOMError();
return -1;
}
if (virFileExists(path)) {
char *valuestr;
if (virFileReadAll(path, INT_BUFSIZE_BOUND(unsigned long), &valuestr) < 0)
goto cleanup;
if (virStrToLong_ul(valuestr, NULL, 10, value) < 0) {
virReportSystemError(EINVAL,
_("Unable to get bridge %s %s"), brname, paramname);
}
} else {
struct __bridge_info info;
unsigned long args[] = { BRCTL_GET_BRIDGE_INFO, (unsigned long)&info, 0, 0 };
ifr->ifr_data = (char*)&args;
if (ioctl(fd, SIOCDEVPRIVATE, ifr) < 0) {
virReportSystemError(errno,
_("Unable to get bridge %s %s"), brname, paramname);
goto cleanup;
}
if (STREQ(paramname, "stp_state")) {
*value = info.stp_enabled;
} else if (STREQ(paramname, "forward_delay")) {
*value = info.forward_delay;
} else {
virReportSystemError(EINVAL,
_("Unable to get bridge %s %s"), brname, paramname);
goto cleanup;
}
}
ret = 0;
cleanup:
VIR_FREE(path);
return ret;
}
#endif /* __linux__ */
/**
* virNetDevBridgeCreate:
* @brname: the bridge name
*
* This function register a new bridge
*
* Returns 0 in case of success or -1 on failure
*/
#ifdef SIOCBRADDBR
int virNetDevBridgeCreate(const char *brname)
{
int fd = -1;
int ret = -1;
if ((fd = virNetDevSetupControl(NULL, NULL)) < 0)
return -1;
if (ioctl(fd, SIOCBRADDBR, brname) < 0) {
virReportSystemError(errno,
_("Unable to create bridge %s"), brname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else
int virNetDevBridgeCreate(const char *brname)
{
virReportSystemError(ENOSYS,
_("Unable to create bridge %s"), brname);
return -1;
}
#endif
/**
* virNetDevBridgeDelete:
* @brname: the bridge name
*
* Remove a bridge from the layer.
*
* Returns 0 in case of success or an errno code in case of failure.
*/
#ifdef SIOCBRDELBR
int virNetDevBridgeDelete(const char *brname)
{
int fd = -1;
int ret = -1;
if ((fd = virNetDevSetupControl(NULL, NULL)) < 0)
return -1;
if (ioctl(fd, SIOCBRDELBR, brname) < 0) {
virReportSystemError(errno,
_("Unable to delete bridge %s"), brname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else
int virNetDevBridgeDelete(const char *brname ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Unable to delete bridge %s"), brname);
return EINVAL;
}
#endif
/**
* virNetDevBridgeAddPort:
* @brname: the bridge name
* @ifname: the network interface name
*
* Adds an interface to a bridge
*
* Returns 0 in case of success or an errno code in case of failure.
*/
#ifdef SIOCBRADDIF
int virNetDevBridgeAddPort(const char *brname,
const char *ifname)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
return -1;
if (!(ifr.ifr_ifindex = if_nametoindex(ifname))) {
virReportSystemError(ENODEV,
_("Unable to get interface index for %s"), ifname);
goto cleanup;
}
if (ioctl(fd, SIOCBRADDIF, &ifr) < 0) {
virReportSystemError(errno,
_("Unable to add bridge %s port %s"), brname, ifname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else
int virNetDevBridgeAddPort(const char *brname,
const char *ifname)
{
virReportSystemError(ENOSYS,
_("Unable to add bridge %s port %s"), brname, ifname);
return -1;
}
#endif
/**
* virNetDevBridgeRemovePort:
* @brname: the bridge name
* @ifname: the network interface name
*
* Removes an interface from a bridge
*
* Returns 0 in case of success or an errno code in case of failure.
*/
#ifdef SIOCBRDELIF
int virNetDevBridgeRemovePort(const char *brname,
const char *ifname)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
return -1;
if (!(ifr.ifr_ifindex = if_nametoindex(ifname))) {
virReportSystemError(ENODEV,
_("Unable to get interface index for %s"), ifname);
goto cleanup;
}
if (ioctl(fd, SIOCBRDELIF, &ifr) < 0) {
virReportSystemError(errno,
_("Unable to remove bridge %s port %s"), brname, ifname);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else
int virNetDevBridgeRemovePort(const char *brname,
const char *ifname)
{
virReportSystemError(ENOSYS,
_("Unable to remove bridge %s port %s"), brname, ifname);
return -1;
}
#endif
#ifdef __linux__
/**
* virNetDevBridgeSetSTPDelay:
* @brname: the bridge name
* @delay: delay in seconds
*
* Set the bridge forward delay
*
* Returns 0 in case of success or -1 on failure
*/
int virNetDevBridgeSetSTPDelay(const char *brname,
int delay)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
goto cleanup;
ret = virNetDevBridgeSet(brname, "stp_state", MS_TO_JIFFIES(delay),
fd, &ifr);
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
/**
* virNetDevBridgeGetSTPDelay:
* @brname: the bridge device name
* @delayms: the forward delay in milliseconds
*
* Retrives the forward delay for the bridge device @brname
* storing it in @delayms. The forward delay is only meaningful
* if STP is enabled
*
* Returns 0 on success, -1 on error+
*/
int virNetDevBridgeGetSTPDelay(const char *brname,
int *delayms)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
unsigned long i;
if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
goto cleanup;
ret = virNetDevBridgeGet(brname, "stp_state", &i,
fd, &ifr);
*delayms = JIFFIES_TO_MS(i);
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
/**
* virNetDevBridgeSetSTP:
* @brname: the bridge name
* @enable: 1 to enable, 0 to disable
*
* Control whether the bridge participates in the spanning tree protocol,
* in general don't disable it without good reasons.
*
* Returns 0 in case of success or -1 on failure
*/
int virNetDevBridgeSetSTP(const char *brname,
bool enable)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
goto cleanup;
ret = virNetDevBridgeSet(brname, "stp_state", enable ? 1 : 0,
fd, &ifr);
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
/**
* virNetDevBridgeGetSTP:
* @brname: the bridge device name
* @enabled: returns the STP state
*
* Determine the state of the spanning tree protocol on
* the device @brname, returning the state in @enabled
*
* Returns 0 on success, -1 on error
*/
int virNetDevBridgeGetSTP(const char *brname,
bool *enabled)
{
int fd = -1;
int ret = -1;
struct ifreq ifr;
unsigned long i;
if ((fd = virNetDevSetupControl(brname, &ifr)) < 0)
goto cleanup;
ret = virNetDevBridgeGet(brname, "stp_state", &i,
fd, &ifr);
*enabled = i ? true : false;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else /* !__linux__ */
int virNetDevBridgeSetSTPDelay(const char *brname,
int delay ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Unable to set STP delay on %s on this platform"),
brname);
return -1;
}
int virNetDevBridgeGetSTPDelay(const char *brname,
int *delay ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Unable to get STP delay on %s on this platform"),
brname);
return -1;
}
int virNetDevBridgeSetSTP(const char *brname,
bool enable ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Unable to set STP on %s on this platform"),
brname);
return -1;
}
int virNetDevBridgeGetSTP(const char *brname,
bool *enable ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS,
_("Unable to get STP on %s on this platform"),
brname);
return -1;
}
#endif /* __linux__ */

54
src/util/virnetdevbridge.h Normal file
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@ -0,0 +1,54 @@
/*
* Copyright (C) 2007-2011 Red Hat, Inc.
*
* 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:
* Mark McLoughlin <markmc@redhat.com>
* Daniel P. Berrange <berrange@redhat.com>
*/
#ifndef __VIR_NETDEV_BRIDGE_H__
# define __VIR_NETDEV_BRIDGE_H__
# include "internal.h"
int virNetDevBridgeCreate(const char *brname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevBridgeDelete(const char *brname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevBridgeAddPort(const char *brname,
const char *ifname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevBridgeRemovePort(const char *brname,
const char *ifname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevBridgeSetSTPDelay(const char *brname,
int delay)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevBridgeGetSTPDelay(const char *brname,
int *delay)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevBridgeSetSTP(const char *brname,
bool enable)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevBridgeGetSTP(const char *brname,
bool *enable)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
#endif /* __VIR_NETDEV_BRIDGE_H__ */

300
src/util/virnetdevtap.c Normal file
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@ -0,0 +1,300 @@
/*
* Copyright (C) 2007-2011 Red Hat, Inc.
*
* 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:
* Mark McLoughlin <markmc@redhat.com>
* Daniel P. Berrange <berrange@redhat.com>
*/
#include <config.h>
#include "virnetdevtap.h"
#include "virnetdev.h"
#include "virnetdevbridge.h"
#include "virterror_internal.h"
#include "virfile.h"
#include "virterror_internal.h"
#include "memory.h"
#include "logging.h"
#include <sys/ioctl.h>
#ifdef HAVE_NET_IF_H
# include <net/if.h>
#endif
#include <fcntl.h>
#ifdef __linux__
# include <linux/if_tun.h> /* IFF_TUN, IFF_NO_PI */
#endif
#define VIR_FROM_THIS VIR_FROM_NONE
/**
* virNetDevProbeVnetHdr:
* @tapfd: a tun/tap file descriptor
*
* Check whether it is safe to enable the IFF_VNET_HDR flag on the
* tap interface.
*
* Setting IFF_VNET_HDR enables QEMU's virtio_net driver to allow
* guests to pass larger (GSO) packets, with partial checksums, to
* the host. This greatly increases the achievable throughput.
*
* It is only useful to enable this when we're setting up a virtio
* interface. And it is only *safe* to enable it when we know for
* sure that a) qemu has support for IFF_VNET_HDR and b) the running
* kernel implements the TUNGETIFF ioctl(), which qemu needs to query
* the supplied tapfd.
*
* Returns 1 if VnetHdr is supported, 0 if not supported
*/
#ifdef IFF_VNET_HDR
static int
virNetDevProbeVnetHdr(int tapfd)
{
# if defined(IFF_VNET_HDR) && defined(TUNGETFEATURES) && defined(TUNGETIFF)
unsigned int features;
struct ifreq dummy;
if (ioctl(tapfd, TUNGETFEATURES, &features) != 0) {
VIR_INFO("Not enabling IFF_VNET_HDR; "
"TUNGETFEATURES ioctl() not implemented");
return 0;
}
if (!(features & IFF_VNET_HDR)) {
VIR_INFO("Not enabling IFF_VNET_HDR; "
"TUNGETFEATURES ioctl() reports no IFF_VNET_HDR");
return 0;
}
/* The kernel will always return -1 at this point.
* If TUNGETIFF is not implemented then errno == EBADFD.
*/
if (ioctl(tapfd, TUNGETIFF, &dummy) != -1 || errno != EBADFD) {
VIR_INFO("Not enabling IFF_VNET_HDR; "
"TUNGETIFF ioctl() not implemented");
return 0;
}
VIR_INFO("Enabling IFF_VNET_HDR");
return 1;
# else
(void) tapfd;
VIR_INFO("Not enabling IFF_VNET_HDR; disabled at build time");
return 0;
# endif
}
#endif
#ifdef TUNSETIFF
/**
* brCreateTap:
* @ifname: the interface name
* @vnet_hr: whether to try enabling IFF_VNET_HDR
* @tapfd: file descriptor return value for the new tap device
*
* Creates a tap interface.
* If the @tapfd parameter is supplied, the open tap device file
* descriptor will be returned, otherwise the TAP device will be made
* persistent and closed. The caller must use brDeleteTap to remove
* a persistent TAP devices when it is no longer needed.
*
* Returns 0 in case of success or an errno code in case of failure.
*/
int virNetDevTapCreate(char **ifname,
int vnet_hdr ATTRIBUTE_UNUSED,
int *tapfd)
{
int fd;
struct ifreq ifr;
int ret = -1;
if ((fd = open("/dev/net/tun", O_RDWR)) < 0) {
virReportSystemError(errno, "%s",
_("Unable to open /dev/net/tun, is tun module loaded?"));
return -1;
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
# ifdef IFF_VNET_HDR
if (vnet_hdr && virNetDevProbeVnetHdr(fd))
ifr.ifr_flags |= IFF_VNET_HDR;
# endif
if (virStrcpyStatic(ifr.ifr_name, *ifname) == NULL) {
virReportSystemError(ERANGE,
_("Network interface name '%s' is too long"),
*ifname);
goto cleanup;
}
if (ioctl(fd, TUNSETIFF, &ifr) < 0) {
virReportSystemError(errno,
_("Unable to create tap device %s"),
NULLSTR(*ifname));
goto cleanup;
}
if (!tapfd &&
(errno = ioctl(fd, TUNSETPERSIST, 1))) {
virReportSystemError(errno,
_("Unable to set tap device %s to persistent"),
NULLSTR(*ifname));
goto cleanup;
}
VIR_FREE(*ifname);
if (!(*ifname = strdup(ifr.ifr_name))) {
virReportOOMError();
goto cleanup;
}
if (tapfd)
*tapfd = fd;
else
VIR_FORCE_CLOSE(fd);
ret = 0;
cleanup:
if (ret < 0)
VIR_FORCE_CLOSE(fd);
return ret;
}
int virNetDevTapDelete(const char *ifname)
{
struct ifreq try;
int fd;
int ret = -1;
if ((fd = open("/dev/net/tun", O_RDWR)) < 0) {
virReportSystemError(errno, "%s",
_("Unable to open /dev/net/tun, is tun module loaded?"));
return -1;
}
memset(&try, 0, sizeof(struct ifreq));
try.ifr_flags = IFF_TAP|IFF_NO_PI;
if (virStrcpyStatic(try.ifr_name, ifname) == NULL) {
virReportSystemError(ERANGE,
_("Network interface name '%s' is too long"),
ifname);
goto cleanup;
}
if (ioctl(fd, TUNSETIFF, &try) < 0) {
virReportSystemError(errno, "%s",
_("Unable to associate TAP device"));
goto cleanup;
}
if (ioctl(fd, TUNSETPERSIST, 0) < 0) {
virReportSystemError(errno, "%s",
_("Unable to make TAP device non-persistent"));
goto cleanup;
}
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
#else /* ! TUNSETIFF */
int virNetDevTapCreate(char **ifname ATTRIBUTE_UNUSED,
int vnet_hdr ATTRIBUTE_UNUSED,
int *tapfd ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Unable to create TAP devices on this platform"));
return -1;
}
int virNetDevTapDelete(const char *ifname ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Unable to delete TAP devices on this platform"));
return -1;
}
#endif /* ! TUNSETIFF */
/**
* virNetDevTapCreateInBridgePort:
* @brname: the bridge name
* @ifname: the interface name (or name template)
* @macaddr: desired MAC address (VIR_MAC_BUFLEN long)
* @vnet_hdr: whether to try enabling IFF_VNET_HDR
* @tapfd: file descriptor return value for the new tap device
*
* This function creates a new tap device on a bridge. @ifname can be either
* a fixed name or a name template with '%d' for dynamic name allocation.
* in either case the final name for the bridge will be stored in @ifname.
* If the @tapfd parameter is supplied, the open tap device file
* descriptor will be returned, otherwise the TAP device will be made
* persistent and closed. The caller must use brDeleteTap to remove
* a persistent TAP devices when it is no longer needed.
*
* Returns 0 in case of success or -1 on failure
*/
int virNetDevTapCreateInBridgePort(const char *brname,
char **ifname,
const unsigned char *macaddr,
int vnet_hdr,
bool up,
int *tapfd)
{
if (virNetDevTapCreate(ifname, vnet_hdr, tapfd) < 0)
return -1;
/* We need to set the interface MAC before adding it
* to the bridge, because the bridge assumes the lowest
* MAC of all enslaved interfaces & we don't want it
* seeing the kernel allocate random MAC for the TAP
* device before we set our static MAC.
*/
if (virNetDevSetMAC(*ifname, macaddr) < 0)
goto error;
/* We need to set the interface MTU before adding it
* to the bridge, because the bridge will have its
* MTU adjusted automatically when we add the new interface.
*/
if (virNetDevSetMTUFromDevice(*ifname, brname) < 0)
goto error;
if (virNetDevBridgeAddPort(brname, *ifname) < 0)
goto error;
if (virNetDevSetOnline(*ifname, up) < 0)
goto error;
return 0;
error:
VIR_FORCE_CLOSE(*tapfd);
return errno;
}

45
src/util/virnetdevtap.h Normal file
View File

@ -0,0 +1,45 @@
/*
* Copyright (C) 2007-2011 Red Hat, Inc.
*
* 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:
* Mark McLoughlin <markmc@redhat.com>
* Daniel P. Berrange <berrange@redhat.com>
*/
#ifndef __VIR_NETDEV_TAP_H__
# define __VIR_NETDEV_TAP_H__
# include "internal.h"
int virNetDevTapCreate(char **ifname,
int vnet_hdr,
int *tapfd)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevTapDelete(const char *ifname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevTapCreateInBridgePort(const char *brname,
char **ifname,
const unsigned char *macaddr,
int vnet_hdr,
bool up,
int *tapfd)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
ATTRIBUTE_RETURN_CHECK;
#endif /* __VIR_NETDEV_TAP_H__ */