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https://gitlab.com/libvirt/libvirt.git
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389 lines
9.7 KiB
C
389 lines
9.7 KiB
C
/*
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* virnwfilterobj.c: network filter object processing
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* (derived from nwfilter_conf.c)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <dirent.h>
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#include "datatypes.h"
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#include "viralloc.h"
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#include "virerror.h"
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#include "virfile.h"
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#include "virlog.h"
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#include "virnwfilterobj.h"
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#include "virstring.h"
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#define VIR_FROM_THIS VIR_FROM_NWFILTER
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VIR_LOG_INIT("conf.virnwfilterobj");
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void
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virNWFilterObjFree(virNWFilterObjPtr obj)
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{
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if (!obj)
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return;
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virNWFilterDefFree(obj->def);
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virNWFilterDefFree(obj->newDef);
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virMutexDestroy(&obj->lock);
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VIR_FREE(obj);
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}
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void
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virNWFilterObjListFree(virNWFilterObjListPtr nwfilters)
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{
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size_t i;
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for (i = 0; i < nwfilters->count; i++)
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virNWFilterObjFree(nwfilters->objs[i]);
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VIR_FREE(nwfilters->objs);
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nwfilters->count = 0;
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}
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void
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virNWFilterObjRemove(virNWFilterObjListPtr nwfilters,
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virNWFilterObjPtr nwfilter)
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{
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size_t i;
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virNWFilterObjUnlock(nwfilter);
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for (i = 0; i < nwfilters->count; i++) {
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virNWFilterObjLock(nwfilters->objs[i]);
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if (nwfilters->objs[i] == nwfilter) {
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virNWFilterObjUnlock(nwfilters->objs[i]);
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virNWFilterObjFree(nwfilters->objs[i]);
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VIR_DELETE_ELEMENT(nwfilters->objs, i, nwfilters->count);
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break;
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}
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virNWFilterObjUnlock(nwfilters->objs[i]);
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}
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}
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virNWFilterObjPtr
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virNWFilterObjFindByUUID(virNWFilterObjListPtr nwfilters,
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const unsigned char *uuid)
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{
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size_t i;
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for (i = 0; i < nwfilters->count; i++) {
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virNWFilterObjLock(nwfilters->objs[i]);
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if (!memcmp(nwfilters->objs[i]->def->uuid, uuid, VIR_UUID_BUFLEN))
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return nwfilters->objs[i];
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virNWFilterObjUnlock(nwfilters->objs[i]);
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}
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return NULL;
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}
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virNWFilterObjPtr
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virNWFilterObjFindByName(virNWFilterObjListPtr nwfilters,
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const char *name)
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{
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size_t i;
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for (i = 0; i < nwfilters->count; i++) {
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virNWFilterObjLock(nwfilters->objs[i]);
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if (STREQ_NULLABLE(nwfilters->objs[i]->def->name, name))
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return nwfilters->objs[i];
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virNWFilterObjUnlock(nwfilters->objs[i]);
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}
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return NULL;
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}
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static int
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_virNWFilterObjDefLoopDetect(virNWFilterObjListPtr nwfilters,
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virNWFilterDefPtr def,
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const char *filtername)
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{
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int rc = 0;
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size_t i;
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virNWFilterEntryPtr entry;
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virNWFilterObjPtr obj;
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if (!def)
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return 0;
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for (i = 0; i < def->nentries; i++) {
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entry = def->filterEntries[i];
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if (entry->include) {
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if (STREQ(filtername, entry->include->filterref)) {
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rc = -1;
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break;
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}
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obj = virNWFilterObjFindByName(nwfilters,
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entry->include->filterref);
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if (obj) {
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rc = _virNWFilterObjDefLoopDetect(nwfilters,
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obj->def, filtername);
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virNWFilterObjUnlock(obj);
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if (rc < 0)
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break;
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}
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}
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}
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return rc;
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}
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/*
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* virNWFilterObjDefLoopDetect:
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* @nwfilters : the nwfilters to search
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* @def : the filter definition that may add a loop and is to be tested
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*
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* Detect a loop introduced through the filters being able to
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* reference each other.
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*
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* Returns 0 in case no loop was detected, -1 otherwise.
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*/
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static int
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virNWFilterObjDefLoopDetect(virNWFilterObjListPtr nwfilters,
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virNWFilterDefPtr def)
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{
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return _virNWFilterObjDefLoopDetect(nwfilters, def, def->name);
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}
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int
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virNWFilterObjTestUnassignDef(virNWFilterObjPtr nwfilter)
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{
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int rc = 0;
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nwfilter->wantRemoved = 1;
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/* trigger the update on VMs referencing the filter */
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if (virNWFilterTriggerVMFilterRebuild())
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rc = -1;
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nwfilter->wantRemoved = 0;
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return rc;
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}
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static bool
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virNWFilterDefEqual(const virNWFilterDef *def1,
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virNWFilterDefPtr def2,
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bool cmpUUIDs)
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{
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bool ret = false;
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unsigned char rem_uuid[VIR_UUID_BUFLEN];
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char *xml1, *xml2 = NULL;
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if (!cmpUUIDs) {
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/* make sure the UUIDs are equal */
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memcpy(rem_uuid, def2->uuid, sizeof(rem_uuid));
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memcpy(def2->uuid, def1->uuid, sizeof(def2->uuid));
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}
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if (!(xml1 = virNWFilterDefFormat(def1)) ||
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!(xml2 = virNWFilterDefFormat(def2)))
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goto cleanup;
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ret = STREQ(xml1, xml2);
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cleanup:
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if (!cmpUUIDs)
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memcpy(def2->uuid, rem_uuid, sizeof(rem_uuid));
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VIR_FREE(xml1);
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VIR_FREE(xml2);
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return ret;
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}
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virNWFilterObjPtr
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virNWFilterObjAssignDef(virNWFilterObjListPtr nwfilters,
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virNWFilterDefPtr def)
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{
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virNWFilterObjPtr nwfilter;
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nwfilter = virNWFilterObjFindByUUID(nwfilters, def->uuid);
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if (nwfilter) {
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if (STRNEQ(def->name, nwfilter->def->name)) {
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virReportError(VIR_ERR_OPERATION_FAILED,
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_("filter with same UUID but different name "
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"('%s') already exists"),
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nwfilter->def->name);
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virNWFilterObjUnlock(nwfilter);
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return NULL;
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}
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virNWFilterObjUnlock(nwfilter);
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} else {
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nwfilter = virNWFilterObjFindByName(nwfilters, def->name);
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if (nwfilter) {
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char uuidstr[VIR_UUID_STRING_BUFLEN];
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virUUIDFormat(nwfilter->def->uuid, uuidstr);
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virReportError(VIR_ERR_OPERATION_FAILED,
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_("filter '%s' already exists with uuid %s"),
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def->name, uuidstr);
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virNWFilterObjUnlock(nwfilter);
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return NULL;
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}
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}
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if (virNWFilterObjDefLoopDetect(nwfilters, def) < 0) {
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virReportError(VIR_ERR_OPERATION_FAILED,
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"%s", _("filter would introduce a loop"));
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return NULL;
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}
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if ((nwfilter = virNWFilterObjFindByName(nwfilters, def->name))) {
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if (virNWFilterDefEqual(def, nwfilter->def, false)) {
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virNWFilterDefFree(nwfilter->def);
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nwfilter->def = def;
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return nwfilter;
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}
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nwfilter->newDef = def;
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/* trigger the update on VMs referencing the filter */
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if (virNWFilterTriggerVMFilterRebuild()) {
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nwfilter->newDef = NULL;
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virNWFilterObjUnlock(nwfilter);
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return NULL;
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}
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virNWFilterDefFree(nwfilter->def);
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nwfilter->def = def;
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nwfilter->newDef = NULL;
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return nwfilter;
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}
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if (VIR_ALLOC(nwfilter) < 0)
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return NULL;
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if (virMutexInitRecursive(&nwfilter->lock) < 0) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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"%s", _("cannot initialize mutex"));
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VIR_FREE(nwfilter);
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return NULL;
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}
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virNWFilterObjLock(nwfilter);
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nwfilter->active = 0;
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if (VIR_APPEND_ELEMENT_COPY(nwfilters->objs,
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nwfilters->count, nwfilter) < 0) {
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virNWFilterObjUnlock(nwfilter);
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virNWFilterObjFree(nwfilter);
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return NULL;
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}
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nwfilter->def = def;
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return nwfilter;
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}
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static virNWFilterObjPtr
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virNWFilterObjLoadConfig(virNWFilterObjListPtr nwfilters,
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const char *configDir,
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const char *name)
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{
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virNWFilterDefPtr def = NULL;
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virNWFilterObjPtr nwfilter;
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char *configFile = NULL;
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if (!(configFile = virFileBuildPath(configDir, name, ".xml")))
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goto error;
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if (!(def = virNWFilterDefParseFile(configFile)))
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goto error;
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if (STRNEQ(name, def->name)) {
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virReportError(VIR_ERR_XML_ERROR,
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_("network filter config filename '%s' "
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"does not match name '%s'"),
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configFile, def->name);
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goto error;
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}
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/* We generated a UUID, make it permanent by saving the config to disk */
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if (!def->uuid_specified &&
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virNWFilterSaveConfig(configDir, def) < 0)
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goto error;
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if (!(nwfilter = virNWFilterObjAssignDef(nwfilters, def)))
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goto error;
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VIR_FREE(configFile);
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return nwfilter;
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error:
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VIR_FREE(configFile);
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virNWFilterDefFree(def);
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return NULL;
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}
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int
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virNWFilterObjLoadAllConfigs(virNWFilterObjListPtr nwfilters,
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const char *configDir)
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{
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DIR *dir;
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struct dirent *entry;
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int ret = -1;
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int rc;
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if ((rc = virDirOpenIfExists(&dir, configDir)) <= 0)
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return rc;
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while ((ret = virDirRead(dir, &entry, configDir)) > 0) {
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virNWFilterObjPtr nwfilter;
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if (!virFileStripSuffix(entry->d_name, ".xml"))
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continue;
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nwfilter = virNWFilterObjLoadConfig(nwfilters, configDir, entry->d_name);
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if (nwfilter)
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virNWFilterObjUnlock(nwfilter);
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}
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VIR_DIR_CLOSE(dir);
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return ret;
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}
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void
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virNWFilterObjLock(virNWFilterObjPtr obj)
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{
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virMutexLock(&obj->lock);
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}
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void
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virNWFilterObjUnlock(virNWFilterObjPtr obj)
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{
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virMutexUnlock(&obj->lock);
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}
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