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nwfilter: fix loadable module support 

Following Daniel Berrange's multiple helpful suggestions for improving
this patch and introducing another driver interface, I now wrote the
below patch where the nwfilter driver registers the functions to
instantiate and teardown the nwfilters with a function in
conf/domain_nwfilter.c called virDomainConfNWFilterRegister. Previous
helper functions that were called from qemu_driver.c and qemu_conf.c
were move into conf/domain_nwfilter.h with slight renaming done for
consistency. Those functions now call the function expored by
domain_nwfilter.c, which in turn call the functions of the new driver
interface, if available.
This commit is contained in:
Stefan Berger 2010-06-21 14:18:31 -04:00
parent c7a33939bc
commit cab5a52aa2
8 changed files with 148 additions and 31 deletions
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3
src/Makefile.am
View File

@ -97,7 +97,8 @@ DRIVER_SOURCES = \
# Domain driver generic impl APIs
DOMAIN_CONF_SOURCES = \
conf/capabilities.c conf/capabilities.h \
conf/domain_conf.c conf/domain_conf.h
conf/domain_conf.c conf/domain_conf.h \
conf/domain_nwfilter.c conf/domain_nwfilter.h
DOMAIN_EVENT_SOURCES = \
conf/domain_event.c conf/domain_event.h

61
src/conf/domain_nwfilter.c Normal file
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@ -0,0 +1,61 @@
/*
* domain_nwfilter.c:
*
* 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
*
* Author: Stefan Berger <stefanb@us.ibm.com>
*/
#include <config.h>
#include "internal.h"
#include "datatypes.h"
#include "domain_conf.h"
#include "domain_nwfilter.h"
static virDomainConfNWFilterDriverPtr nwfilterDriver;
void
virDomainConfNWFilterRegister(virDomainConfNWFilterDriverPtr driver) {
nwfilterDriver = driver;
}
int
virDomainConfNWFilterInstantiate(virConnectPtr conn,
virDomainNetDefPtr net) {
if (nwfilterDriver != NULL)
return nwfilterDriver->instantiateFilter(conn, net);
/* driver module not available -- don't indicate failure */
return 0;
}
void
virDomainConfNWFilterTeardown(virDomainNetDefPtr net) {
if (nwfilterDriver != NULL)
nwfilterDriver->teardownFilter(net);
}
void
virDomainConfVMNWFilterTeardown(virDomainObjPtr vm) {
int i;
if (nwfilterDriver != NULL) {
for (i = 0; i < vm->def->nnets; i++)
virDomainConfNWFilterTeardown(vm->def->nets[i]);
}
}

43
src/conf/domain_nwfilter.h Normal file
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@ -0,0 +1,43 @@
/*
* domain_nwfilter.h:
*
* Copyright (C) 2010 IBM Corporation
* Copyright (C) 2010 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
*
* Author: Stefan Berger <stefanb@us.ibm.com>
*/
#ifndef DOMAIN_NWFILTER_H
# define DOMAIN_NWFILTER_H
typedef int (*virDomainConfInstantiateNWFilter)(virConnectPtr conn,
virDomainNetDefPtr net);
typedef void (*virDomainConfTeardownNWFilter)(virDomainNetDefPtr net);
typedef struct {
virDomainConfInstantiateNWFilter instantiateFilter;
virDomainConfTeardownNWFilter teardownFilter;
} virDomainConfNWFilterDriver;
typedef virDomainConfNWFilterDriver *virDomainConfNWFilterDriverPtr;
void virDomainConfNWFilterRegister(virDomainConfNWFilterDriverPtr driver);
int virDomainConfNWFilterInstantiate(virConnectPtr conn,
virDomainNetDefPtr net);
void virDomainConfNWFilterTeardown(virDomainNetDefPtr net);
void virDomainConfVMNWFilterTeardown(virDomainObjPtr vm);
#endif /* DOMAIN_NWFILTER_H */

5
src/libvirt_private.syms
View File

@ -264,6 +264,11 @@ virDomainEventDispatchDefaultFunc;
virDomainEventDispatch;
virDomainEventQueueDispatch;
# domain_nwfilter.h
virDomainConfNWFilterRegister;
virDomainConfNWFilterInstantiate;
virDomainConfNWFilterTeardown;
virDomainConfVMNWFilterTeardown;
# ebtables.h
ebtablesAddForwardAllowIn;

23
src/nwfilter/nwfilter_driver.c
View File

@ -33,6 +33,7 @@
#include "datatypes.h"
#include "memory.h"
#include "domain_conf.h"
#include "domain_nwfilter.h"
#include "nwfilter_driver.h"
#include "nwfilter_gentech_driver.h"
@ -410,6 +411,20 @@ cleanup:
}
static int
nwfilterInstantiateFilter(virConnectPtr conn,
virDomainNetDefPtr net) {
return virNWFilterInstantiateFilter(conn, net);
}
static void
nwfilterTeardownFilter(virDomainNetDefPtr net) {
if ((net->ifname) && (net->filter))
virNWFilterTeardownFilter(net);
}
static virNWFilterDriver nwfilterDriver = {
.name = "nwfilter",
.open = nwfilterOpen,
@ -432,8 +447,16 @@ static virStateDriver stateDriver = {
.active = nwfilterDriverActive,
};
static virDomainConfNWFilterDriver domainNWFilterDriver = {
.instantiateFilter = nwfilterInstantiateFilter,
.teardownFilter = nwfilterTeardownFilter,
};
int nwfilterRegister(void) {
virRegisterNWFilterDriver(&nwfilterDriver);
virRegisterStateDriver(&stateDriver);
virDomainConfNWFilterRegister(&domainNWFilterDriver);
return 0;
}

17
src/nwfilter/nwfilter_gentech_driver.h
View File

@ -67,21 +67,4 @@ void virNWFilterDomainFWUpdateCB(void *payload,
const char *name ATTRIBUTE_UNUSED,
void *data);
/* tear down an interface's filter before tearing down the interface */
static inline void
virNWFilterTearNWFilter(virDomainNetDefPtr net) {
if ((net->filter) && (net->ifname))
virNWFilterTeardownFilter(net);
}
static inline void
virNWFilterTearVMNWFilters(virDomainObjPtr vm) {
int i;
for (i = 0; i < vm->def->nnets; i++)
virNWFilterTearNWFilter(vm->def->nets[i]);
}
#endif

17
src/qemu/qemu_conf.c
View File

@ -54,7 +54,7 @@
#include "network.h"
#include "macvtap.h"
#include "cpu/cpu.h"
#include "nwfilter/nwfilter_gentech_driver.h"
#include "domain_nwfilter.h"
#define VIR_FROM_THIS VIR_FROM_QEMU
@ -1514,9 +1514,10 @@ int qemudExtractVersion(struct qemud_driver *driver) {
/**
* qemudPhysIfaceConnect:
* @conn: pointer to virConnect object
* @driver: pointer to the qemud_driver
* @net: pointer to he VM's interface description with direct device type
* @linkdev: The name of the physical interface to link the macvtap to
* @brmode: The mode to put the macvtap device into
* @qemuCmdFlags: flags for qemu
* @vmuuid: The UUID of the VM (needed by 802.1Qbh)
*
* Returns a filedescriptor on success or -1 in case of error.
*/
@ -1555,7 +1556,7 @@ qemudPhysIfaceConnect(virConnectPtr conn,
if (rc >= 0) {
if ((net->filter) && (net->ifname)) {
err = virNWFilterInstantiateFilter(conn, net);
err = virDomainConfNWFilterInstantiate(conn, net);
if (err) {
close(rc);
rc = -1;
@ -1688,7 +1689,7 @@ qemudNetworkIfaceConnect(virConnectPtr conn,
if (tapfd >= 0) {
if ((net->filter) && (net->ifname)) {
err = virNWFilterInstantiateFilter(conn, net);
err = virDomainConfNWFilterInstantiate(conn, net);
if (err) {
close(tapfd);
tapfd = -1;
@ -4207,7 +4208,7 @@ int qemudBuildCommandLine(virConnectPtr conn,
goto error;
if (VIR_REALLOC_N(*vmfds, (*nvmfds)+1) < 0) {
virNWFilterTearNWFilter(net);
virDomainConfNWFilterTeardown(net);
close(tapfd);
goto no_memory;
}
@ -4226,7 +4227,7 @@ int qemudBuildCommandLine(virConnectPtr conn,
goto error;
if (VIR_REALLOC_N(*vmfds, (*nvmfds)+1) < 0) {
virNWFilterTearNWFilter(net);
virDomainConfNWFilterTeardown(net);
close(tapfd);
goto no_memory;
}
@ -4766,7 +4767,7 @@ int qemudBuildCommandLine(virConnectPtr conn,
virReportOOMError();
error:
for (i = 0; i <= last_good_net; i++)
virNWFilterTearNWFilter(def->nets[i]);
virDomainConfNWFilterTeardown(def->nets[i]);
if (vmfds &&
*vmfds) {
for (i = 0; i < *nvmfds; i++)

10
src/qemu/qemu_driver.c
View File

@ -81,7 +81,7 @@
#include "xml.h"
#include "cpu/cpu.h"
#include "macvtap.h"
#include "nwfilter/nwfilter_gentech_driver.h"
#include "domain_nwfilter.h"
#include "hooks.h"
#include "storage_file.h"
@ -3577,7 +3577,7 @@ static int qemudStartVMDaemon(virConnectPtr conn,
VIR_FREE(progenv);
if (ret == -1) /* The VM failed to start; tear filters before taps */
virNWFilterTearVMNWFilters(vm);
virDomainConfVMNWFilterTeardown(vm);
if (vmfds) {
for (i = 0 ; i < nvmfds ; i++) {
@ -3669,7 +3669,7 @@ static void qemudShutdownVMDaemon(struct qemud_driver *driver,
* reporting so we don't squash a legit error. */
orig_err = virSaveLastError();
virNWFilterTearVMNWFilters(vm);
virDomainConfVMNWFilterTeardown(vm);
if (driver->macFilter) {
def = vm->def;
@ -7646,7 +7646,7 @@ cleanup:
VIR_WARN0("Unable to release PCI address on NIC");
if (ret != 0)
virNWFilterTearNWFilter(net);
virDomainConfNWFilterTeardown(net);
VIR_FREE(nicstr);
VIR_FREE(netstr);
@ -8615,7 +8615,7 @@ qemudDomainDetachNetDevice(struct qemud_driver *driver,
}
qemuDomainObjExitMonitorWithDriver(driver, vm);
virNWFilterTearNWFilter(detach);
virDomainConfNWFilterTeardown(detach);
#if WITH_MACVTAP
if (detach->type == VIR_DOMAIN_NET_TYPE_DIRECT) {