libvirt/src/conf/virnwfilterobj.c

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/*
* virnwfilterobj.c: network filter object processing
* (derived from nwfilter_conf.c)
*
* 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, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <dirent.h>
#include "datatypes.h"
#include "viralloc.h"
#include "virerror.h"
#include "virfile.h"
#include "virlog.h"
#include "virnwfilterobj.h"
#include "virstring.h"
#define VIR_FROM_THIS VIR_FROM_NWFILTER
VIR_LOG_INIT("conf.virnwfilterobj");
void
virNWFilterObjFree(virNWFilterObjPtr obj)
{
if (!obj)
return;
virNWFilterDefFree(obj->def);
virNWFilterDefFree(obj->newDef);
virMutexDestroy(&obj->lock);
VIR_FREE(obj);
}
void
virNWFilterObjListFree(virNWFilterObjListPtr nwfilters)
{
size_t i;
for (i = 0; i < nwfilters->count; i++)
virNWFilterObjFree(nwfilters->objs[i]);
VIR_FREE(nwfilters->objs);
nwfilters->count = 0;
}
void
virNWFilterObjRemove(virNWFilterObjListPtr nwfilters,
virNWFilterObjPtr nwfilter)
{
size_t i;
virNWFilterObjUnlock(nwfilter);
for (i = 0; i < nwfilters->count; i++) {
virNWFilterObjLock(nwfilters->objs[i]);
if (nwfilters->objs[i] == nwfilter) {
virNWFilterObjUnlock(nwfilters->objs[i]);
virNWFilterObjFree(nwfilters->objs[i]);
VIR_DELETE_ELEMENT(nwfilters->objs, i, nwfilters->count);
break;
}
virNWFilterObjUnlock(nwfilters->objs[i]);
}
}
virNWFilterObjPtr
virNWFilterObjFindByUUID(virNWFilterObjListPtr nwfilters,
const unsigned char *uuid)
{
size_t i;
for (i = 0; i < nwfilters->count; i++) {
virNWFilterObjLock(nwfilters->objs[i]);
if (!memcmp(nwfilters->objs[i]->def->uuid, uuid, VIR_UUID_BUFLEN))
return nwfilters->objs[i];
virNWFilterObjUnlock(nwfilters->objs[i]);
}
return NULL;
}
virNWFilterObjPtr
virNWFilterObjFindByName(virNWFilterObjListPtr nwfilters,
const char *name)
{
size_t i;
for (i = 0; i < nwfilters->count; i++) {
virNWFilterObjLock(nwfilters->objs[i]);
if (STREQ_NULLABLE(nwfilters->objs[i]->def->name, name))
return nwfilters->objs[i];
virNWFilterObjUnlock(nwfilters->objs[i]);
}
return NULL;
}
static int
_virNWFilterObjDefLoopDetect(virNWFilterObjListPtr nwfilters,
virNWFilterDefPtr def,
const char *filtername)
{
int rc = 0;
size_t i;
virNWFilterEntryPtr entry;
virNWFilterObjPtr obj;
if (!def)
return 0;
for (i = 0; i < def->nentries; i++) {
entry = def->filterEntries[i];
if (entry->include) {
if (STREQ(filtername, entry->include->filterref)) {
rc = -1;
break;
}
obj = virNWFilterObjFindByName(nwfilters,
entry->include->filterref);
if (obj) {
rc = _virNWFilterObjDefLoopDetect(nwfilters,
obj->def, filtername);
virNWFilterObjUnlock(obj);
if (rc < 0)
break;
}
}
}
return rc;
}
/*
* virNWFilterObjDefLoopDetect:
* @nwfilters : the nwfilters to search
* @def : the filter definition that may add a loop and is to be tested
*
* Detect a loop introduced through the filters being able to
* reference each other.
*
* Returns 0 in case no loop was detected, -1 otherwise.
*/
static int
virNWFilterObjDefLoopDetect(virNWFilterObjListPtr nwfilters,
virNWFilterDefPtr def)
{
return _virNWFilterObjDefLoopDetect(nwfilters, def, def->name);
}
int
virNWFilterObjTestUnassignDef(virNWFilterObjPtr nwfilter)
{
int rc = 0;
nwfilter->wantRemoved = 1;
/* trigger the update on VMs referencing the filter */
if (virNWFilterTriggerVMFilterRebuild())
rc = -1;
nwfilter->wantRemoved = 0;
return rc;
}
static bool
virNWFilterDefEqual(const virNWFilterDef *def1,
virNWFilterDefPtr def2,
bool cmpUUIDs)
{
bool ret = false;
unsigned char rem_uuid[VIR_UUID_BUFLEN];
char *xml1, *xml2 = NULL;
if (!cmpUUIDs) {
/* make sure the UUIDs are equal */
memcpy(rem_uuid, def2->uuid, sizeof(rem_uuid));
memcpy(def2->uuid, def1->uuid, sizeof(def2->uuid));
}
if (!(xml1 = virNWFilterDefFormat(def1)) ||
!(xml2 = virNWFilterDefFormat(def2)))
goto cleanup;
ret = STREQ(xml1, xml2);
cleanup:
if (!cmpUUIDs)
memcpy(def2->uuid, rem_uuid, sizeof(rem_uuid));
VIR_FREE(xml1);
VIR_FREE(xml2);
return ret;
}
virNWFilterObjPtr
virNWFilterObjAssignDef(virNWFilterObjListPtr nwfilters,
virNWFilterDefPtr def)
{
virNWFilterObjPtr nwfilter;
nwfilter = virNWFilterObjFindByUUID(nwfilters, def->uuid);
if (nwfilter) {
if (STRNEQ(def->name, nwfilter->def->name)) {
virReportError(VIR_ERR_OPERATION_FAILED,
_("filter with same UUID but different name "
"('%s') already exists"),
nwfilter->def->name);
virNWFilterObjUnlock(nwfilter);
return NULL;
}
virNWFilterObjUnlock(nwfilter);
} else {
nwfilter = virNWFilterObjFindByName(nwfilters, def->name);
if (nwfilter) {
char uuidstr[VIR_UUID_STRING_BUFLEN];
virUUIDFormat(nwfilter->def->uuid, uuidstr);
virReportError(VIR_ERR_OPERATION_FAILED,
_("filter '%s' already exists with uuid %s"),
def->name, uuidstr);
virNWFilterObjUnlock(nwfilter);
return NULL;
}
}
if (virNWFilterObjDefLoopDetect(nwfilters, def) < 0) {
virReportError(VIR_ERR_OPERATION_FAILED,
"%s", _("filter would introduce a loop"));
return NULL;
}
if ((nwfilter = virNWFilterObjFindByName(nwfilters, def->name))) {
if (virNWFilterDefEqual(def, nwfilter->def, false)) {
virNWFilterDefFree(nwfilter->def);
nwfilter->def = def;
return nwfilter;
}
nwfilter->newDef = def;
/* trigger the update on VMs referencing the filter */
if (virNWFilterTriggerVMFilterRebuild()) {
nwfilter->newDef = NULL;
virNWFilterObjUnlock(nwfilter);
return NULL;
}
virNWFilterDefFree(nwfilter->def);
nwfilter->def = def;
nwfilter->newDef = NULL;
return nwfilter;
}
if (VIR_ALLOC(nwfilter) < 0)
return NULL;
if (virMutexInitRecursive(&nwfilter->lock) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("cannot initialize mutex"));
VIR_FREE(nwfilter);
return NULL;
}
virNWFilterObjLock(nwfilter);
nwfilter->active = 0;
if (VIR_APPEND_ELEMENT_COPY(nwfilters->objs,
nwfilters->count, nwfilter) < 0) {
virNWFilterObjUnlock(nwfilter);
virNWFilterObjFree(nwfilter);
return NULL;
}
nwfilter->def = def;
return nwfilter;
}
static virNWFilterObjPtr
virNWFilterObjLoadConfig(virNWFilterObjListPtr nwfilters,
const char *configDir,
const char *name)
{
virNWFilterDefPtr def = NULL;
virNWFilterObjPtr nwfilter;
char *configFile = NULL;
if (!(configFile = virFileBuildPath(configDir, name, ".xml")))
goto error;
if (!(def = virNWFilterDefParseFile(configFile)))
goto error;
if (STRNEQ(name, def->name)) {
virReportError(VIR_ERR_XML_ERROR,
_("network filter config filename '%s' "
"does not match name '%s'"),
configFile, def->name);
goto error;
}
/* We generated a UUID, make it permanent by saving the config to disk */
if (!def->uuid_specified &&
virNWFilterSaveConfig(configDir, def) < 0)
goto error;
if (!(nwfilter = virNWFilterObjAssignDef(nwfilters, def)))
goto error;
VIR_FREE(configFile);
return nwfilter;
error:
VIR_FREE(configFile);
virNWFilterDefFree(def);
return NULL;
}
int
virNWFilterObjLoadAllConfigs(virNWFilterObjListPtr nwfilters,
const char *configDir)
{
DIR *dir;
struct dirent *entry;
int ret = -1;
int rc;
if ((rc = virDirOpenIfExists(&dir, configDir)) <= 0)
return rc;
while ((ret = virDirRead(dir, &entry, configDir)) > 0) {
virNWFilterObjPtr nwfilter;
if (!virFileStripSuffix(entry->d_name, ".xml"))
continue;
nwfilter = virNWFilterObjLoadConfig(nwfilters, configDir, entry->d_name);
if (nwfilter)
virNWFilterObjUnlock(nwfilter);
}
VIR_DIR_CLOSE(dir);
return ret;
}
void
virNWFilterObjLock(virNWFilterObjPtr obj)
{
virMutexLock(&obj->lock);
}
void
virNWFilterObjUnlock(virNWFilterObjPtr obj)
{
virMutexUnlock(&obj->lock);
}