Remove use of virConnectPtr from all remaining nwfilter code

The virConnectPtr is passed around loads of nwfilter code in
order to provide it as a parameter to the callback registered
by the virt drivers. None of the virt drivers use this param
though, so it serves no purpose.

Avoiding the need to pass a virConnectPtr means that the
nwfilterStateReload method no longer needs to open a bogus
QEMU driver connection. This addresses a race condition that
can lead to a crash on startup.

The nwfilter driver starts before the QEMU driver and registers
some callbacks with DBus to detect firewalld reload. If the
firewalld reload happens while the QEMU driver is still starting
up though, the nwfilterStateReload method will open a connection
to the partially initialized QEMU driver and cause a crash.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
(cherry picked from commit 999d72fbd59ea712128ae294b69b6a54039d757b)

diff --git a/src/conf/nwfilter_conf.c b/src/conf/nwfilter_conf.c
index 614e9f9cacba7eebabdff7e0f19c14f3c8f3c9d9..94b4fe99da61e99cc68544cbc19c515300913358 100644 (file)
--- a/src/conf/nwfilter_conf.c
+++ b/src/conf/nwfilter_conf.c
@@ -2754,8 +2754,7 @@ cleanup:
 
 
 static int
-_virNWFilterDefLoopDetect(virConnectPtr conn,
-                          virNWFilterObjListPtr nwfilters,
+_virNWFilterDefLoopDetect(virNWFilterObjListPtr nwfilters,
                           virNWFilterDefPtr def,
                           const char *filtername)
 {
@@ -2779,7 +2778,7 @@ _virNWFilterDefLoopDetect(virConnectPtr conn,
             obj = virNWFilterObjFindByName(nwfilters,
                                            entry->include->filterref);
             if (obj) {
-                rc = _virNWFilterDefLoopDetect(conn, nwfilters,
+                rc = _virNWFilterDefLoopDetect(nwfilters,
                                                obj->def, filtername);
 
                 virNWFilterObjUnlock(obj);
@@ -2795,7 +2794,6 @@ _virNWFilterDefLoopDetect(virConnectPtr conn,
 
 /*
  * virNWFilterDefLoopDetect:
- * @conn: pointer to virConnect object
  * @nwfilters : the nwfilters to search
  * @def : the filter definition that may add a loop and is to be tested
  *
@@ -2805,11 +2803,10 @@ _virNWFilterDefLoopDetect(virConnectPtr conn,
  * Returns 0 in case no loop was detected, -1 otherwise.
  */
 static int
-virNWFilterDefLoopDetect(virConnectPtr conn,
-                         virNWFilterObjListPtr nwfilters,
+virNWFilterDefLoopDetect(virNWFilterObjListPtr nwfilters,
                          virNWFilterDefPtr def)
 {
-    return _virNWFilterDefLoopDetect(conn, nwfilters, def, def->name);
+    return _virNWFilterDefLoopDetect(nwfilters, def, def->name);
 }
 
 int nCallbackDriver;
@@ -2868,7 +2865,7 @@ static void *virNWFilterDomainFWUpdateOpaque;
  * error. This should be called upon reloading of the driver.
  */
 int
-virNWFilterInstFiltersOnAllVMs(virConnectPtr conn)
+virNWFilterInstFiltersOnAllVMs(void)
 {
     int i;
     struct domUpdateCBStruct cb = {
@@ -2878,15 +2875,14 @@ virNWFilterInstFiltersOnAllVMs(virConnectPtr conn)
     };
 
     for (i = 0; i < nCallbackDriver; i++)
-        callbackDrvArray[i]->vmFilterRebuild(conn,
-                                             virNWFilterDomainFWUpdateCB,
+        callbackDrvArray[i]->vmFilterRebuild(virNWFilterDomainFWUpdateCB,
                                              &cb);
 
     return 0;
 }
 
 static int
-virNWFilterTriggerVMFilterRebuild(virConnectPtr conn)
+virNWFilterTriggerVMFilterRebuild(void)
 {
     int i;
     int ret = 0;
@@ -2900,8 +2896,7 @@ virNWFilterTriggerVMFilterRebuild(virConnectPtr conn)
         return -1;
 
     for (i = 0; i < nCallbackDriver; i++) {
-        if (callbackDrvArray[i]->vmFilterRebuild(conn,
-                                                 virNWFilterDomainFWUpdateCB,
+        if (callbackDrvArray[i]->vmFilterRebuild(virNWFilterDomainFWUpdateCB,
                                                  &cb) < 0)
             ret = -1;
     }
@@ -2910,15 +2905,13 @@ virNWFilterTriggerVMFilterRebuild(virConnectPtr conn)
         cb.step = STEP_TEAR_NEW; /* rollback */
 
         for (i = 0; i < nCallbackDriver; i++)
-            callbackDrvArray[i]->vmFilterRebuild(conn,
-                                                 virNWFilterDomainFWUpdateCB,
+            callbackDrvArray[i]->vmFilterRebuild(virNWFilterDomainFWUpdateCB,
                                                  &cb);
     } else {
         cb.step = STEP_TEAR_OLD; /* switch over */
 
         for (i = 0; i < nCallbackDriver; i++)
-            callbackDrvArray[i]->vmFilterRebuild(conn,
-                                                 virNWFilterDomainFWUpdateCB,
+            callbackDrvArray[i]->vmFilterRebuild(virNWFilterDomainFWUpdateCB,
                                                  &cb);
     }
 
@@ -2929,14 +2922,13 @@ virNWFilterTriggerVMFilterRebuild(virConnectPtr conn)
 
 
 int
-virNWFilterTestUnassignDef(virConnectPtr conn,
-                           virNWFilterObjPtr nwfilter)
+virNWFilterTestUnassignDef(virNWFilterObjPtr nwfilter)
 {
     int rc = 0;
 
     nwfilter->wantRemoved = 1;
     /* trigger the update on VMs referencing the filter */
-    if (virNWFilterTriggerVMFilterRebuild(conn))
+    if (virNWFilterTriggerVMFilterRebuild())
         rc = -1;
 
     nwfilter->wantRemoved = 0;
@@ -2975,8 +2967,7 @@ cleanup:
 }
 
 virNWFilterObjPtr
-virNWFilterObjAssignDef(virConnectPtr conn,
-                        virNWFilterObjListPtr nwfilters,
+virNWFilterObjAssignDef(virNWFilterObjListPtr nwfilters,
                         virNWFilterDefPtr def)
 {
     virNWFilterObjPtr nwfilter;
@@ -2995,7 +2986,7 @@ virNWFilterObjAssignDef(virConnectPtr conn,
         virNWFilterObjUnlock(nwfilter);
     }
 
-    if (virNWFilterDefLoopDetect(conn, nwfilters, def) < 0) {
+    if (virNWFilterDefLoopDetect(nwfilters, def) < 0) {
         virReportError(VIR_ERR_OPERATION_FAILED,
                        "%s", _("filter would introduce a loop"));
         return NULL;
@@ -3014,7 +3005,7 @@ virNWFilterObjAssignDef(virConnectPtr conn,
 
         nwfilter->newDef = def;
         /* trigger the update on VMs referencing the filter */
-        if (virNWFilterTriggerVMFilterRebuild(conn)) {
+        if (virNWFilterTriggerVMFilterRebuild()) {
             nwfilter->newDef = NULL;
             virNWFilterUnlockFilterUpdates();
             virNWFilterObjUnlock(nwfilter);
@@ -3059,8 +3050,7 @@ virNWFilterObjAssignDef(virConnectPtr conn,
 
 
 static virNWFilterObjPtr
-virNWFilterObjLoad(virConnectPtr conn,
-                   virNWFilterObjListPtr nwfilters,
+virNWFilterObjLoad(virNWFilterObjListPtr nwfilters,
                    const char *file,
                    const char *path)
 {
@@ -3079,7 +3069,7 @@ virNWFilterObjLoad(virConnectPtr conn,
         return NULL;
     }
 
-    if (!(nwfilter = virNWFilterObjAssignDef(conn, nwfilters, def))) {
+    if (!(nwfilter = virNWFilterObjAssignDef(nwfilters, def))) {
         virNWFilterDefFree(def);
         return NULL;
     }
@@ -3095,8 +3085,7 @@ virNWFilterObjLoad(virConnectPtr conn,
 
 
 int
-virNWFilterLoadAllConfigs(virConnectPtr conn,
-                          virNWFilterObjListPtr nwfilters,
+virNWFilterLoadAllConfigs(virNWFilterObjListPtr nwfilters,
                           const char *configDir)
 {
     DIR *dir;
@@ -3124,7 +3113,7 @@ virNWFilterLoadAllConfigs(virConnectPtr conn,
         if (!(path = virFileBuildPath(configDir, entry->d_name, NULL)))
             continue;
 
-        nwfilter = virNWFilterObjLoad(conn, nwfilters, entry->d_name, path);
+        nwfilter = virNWFilterObjLoad(nwfilters, entry->d_name, path);
         if (nwfilter)
             virNWFilterObjUnlock(nwfilter);
 

diff --git a/src/conf/nwfilter_conf.h b/src/conf/nwfilter_conf.h
index e470615db76a7ad4456dfb15cd27ba7f63ee187e..29906f1389c6920515a2a2ef7732e093943f5e02 100644 (file)
--- a/src/conf/nwfilter_conf.h
+++ b/src/conf/nwfilter_conf.h
@@ -687,12 +687,10 @@ int virNWFilterObjSaveDef(virNWFilterDriverStatePtr driver,
 
 int virNWFilterObjDeleteDef(virNWFilterObjPtr nwfilter);
 
-virNWFilterObjPtr virNWFilterObjAssignDef(virConnectPtr conn,
-                                          virNWFilterObjListPtr nwfilters,
+virNWFilterObjPtr virNWFilterObjAssignDef(virNWFilterObjListPtr nwfilters,
                                           virNWFilterDefPtr def);
 
-int virNWFilterTestUnassignDef(virConnectPtr conn,
-                               virNWFilterObjPtr nwfilter);
+int virNWFilterTestUnassignDef(virNWFilterObjPtr nwfilter);
 
 virNWFilterDefPtr virNWFilterDefParseNode(xmlDocPtr xml,
                                           xmlNodePtr root);
@@ -706,8 +704,7 @@ int virNWFilterSaveXML(const char *configDir,
 int virNWFilterSaveConfig(const char *configDir,
                           virNWFilterDefPtr def);
 
-int virNWFilterLoadAllConfigs(virConnectPtr conn,
-                              virNWFilterObjListPtr nwfilters,
+int virNWFilterLoadAllConfigs(virNWFilterObjListPtr nwfilters,
                               const char *configDir);
 
 char *virNWFilterConfigFile(const char *dir,
@@ -725,11 +722,10 @@ void virNWFilterUnlockFilterUpdates(void);
 int virNWFilterConfLayerInit(virDomainObjListIterator domUpdateCB, void *opaque);
 void virNWFilterConfLayerShutdown(void);
 
-int virNWFilterInstFiltersOnAllVMs(virConnectPtr conn);
+int virNWFilterInstFiltersOnAllVMs(void);
 
 
-typedef int (*virNWFilterRebuild)(virConnectPtr conn,
-                                  virDomainObjListIterator domUpdateCB,
+typedef int (*virNWFilterRebuild)(virDomainObjListIterator domUpdateCB,
                                   void *data);
 typedef void (*virNWFilterVoidCall)(void);
 

diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index b0f0fd1cd7b766ed94730786603ec290b5861c05..fed3775a2354f707e8f11d46e18233a07ad7d606 100644 (file)
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -84,8 +84,7 @@ virLXCDriverPtr lxc_driver = NULL;
 
 /* callbacks for nwfilter */
 static int
-lxcVMFilterRebuild(virConnectPtr conn ATTRIBUTE_UNUSED,
-                   virDomainObjListIterator iter, void *data)
+lxcVMFilterRebuild(virDomainObjListIterator iter, void *data)
 {
     return virDomainObjListForEach(lxc_driver->domains, iter, data);
 }

diff --git a/src/nwfilter/nwfilter_driver.c b/src/nwfilter/nwfilter_driver.c
index 0681672f8eb39f6dbce4f0e822c277e6b5b198db..630f6227256f9b4806487e9807116591647c0354 100644 (file)
--- a/src/nwfilter/nwfilter_driver.c
+++ b/src/nwfilter/nwfilter_driver.c
@@ -232,8 +232,7 @@ nwfilterStateInitialize(bool privileged,
 
     VIR_FREE(base);
 
-    if (virNWFilterLoadAllConfigs(NULL,
-                                  &driverState->nwfilters,
+    if (virNWFilterLoadAllConfigs(&driverState->nwfilters,
                                   driverState->configDir) < 0)
         goto error;
 
@@ -272,37 +271,28 @@ err_free_driverstate:
  * files and update its state
  */
 static int
-nwfilterStateReload(void) {
-    virConnectPtr conn;
-
-    if (!driverState) {
+nwfilterStateReload(void)
+{
+    if (!driverState)
         return -1;
-    }
 
     if (!driverState->privileged)
         return 0;
 
-    conn = virConnectOpen("qemu:///system");
-
-    if (conn) {
-        virNWFilterDHCPSnoopEnd(NULL);
-        /* shut down all threads -- they will be restarted if necessary */
-        virNWFilterLearnThreadsTerminate(true);
-
-        nwfilterDriverLock(driverState);
-        virNWFilterCallbackDriversLock();
+    virNWFilterDHCPSnoopEnd(NULL);
+    /* shut down all threads -- they will be restarted if necessary */
+    virNWFilterLearnThreadsTerminate(true);
 
-        virNWFilterLoadAllConfigs(conn,
-                                  &driverState->nwfilters,
-                                  driverState->configDir);
+    nwfilterDriverLock(driverState);
+    virNWFilterCallbackDriversLock();
 
-        virNWFilterCallbackDriversUnlock();
-        nwfilterDriverUnlock(driverState);
+    virNWFilterLoadAllConfigs(&driverState->nwfilters,
+                              driverState->configDir);
 
-        virNWFilterInstFiltersOnAllVMs(conn);
+    virNWFilterCallbackDriversUnlock();
+    nwfilterDriverUnlock(driverState);
 
-        virConnectClose(conn);
-    }
+    virNWFilterInstFiltersOnAllVMs();
 
     return 0;
 }
@@ -558,7 +548,7 @@ nwfilterDefineXML(virConnectPtr conn,
     if (virNWFilterDefineXMLEnsureACL(conn, def) < 0)
         goto cleanup;
 
-    if (!(nwfilter = virNWFilterObjAssignDef(conn, &driver->nwfilters, def)))
+    if (!(nwfilter = virNWFilterObjAssignDef(&driver->nwfilters, def)))
         goto cleanup;
 
     if (virNWFilterObjSaveDef(driver, nwfilter, def) < 0) {
@@ -602,7 +592,7 @@ nwfilterUndefine(virNWFilterPtr obj) {
     if (virNWFilterUndefineEnsureACL(obj->conn, nwfilter->def) < 0)
         goto cleanup;
 
-    if (virNWFilterTestUnassignDef(obj->conn, nwfilter) < 0) {
+    if (virNWFilterTestUnassignDef(nwfilter) < 0) {
         virReportError(VIR_ERR_OPERATION_INVALID,
                        "%s",
                        _("nwfilter is in use"));

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index a2d7895d2719d0e70fe150b870d74d23b2c3d955..8ebfadd68182c5b96503e6151a50d0d780100d01 100644 (file)
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -159,8 +159,7 @@ static void
 qemuVMDriverUnlock(void) {}
 
 static int
-qemuVMFilterRebuild(virConnectPtr conn ATTRIBUTE_UNUSED,
-                    virDomainObjListIterator iter, void *data)
+qemuVMFilterRebuild(virDomainObjListIterator iter, void *data)
 {
     return virDomainObjListForEach(qemu_driver->domains, iter, data);
 }

diff --git a/src/uml/uml_driver.c b/src/uml/uml_driver.c
index 25b97485f5a46235f770cf58bba68334b834d8d5..74aa94a69e46985f774fcbbd855b10b333aa06a4 100644 (file)
--- a/src/uml/uml_driver.c
+++ b/src/uml/uml_driver.c
@@ -148,8 +148,7 @@ static int umlMonitorCommand(const struct uml_driver *driver,
 static struct uml_driver *uml_driver = NULL;
 
 static int
-umlVMFilterRebuild(virConnectPtr conn ATTRIBUTE_UNUSED,
-                   virDomainObjListIterator iter, void *data)
+umlVMFilterRebuild(virDomainObjListIterator iter, void *data)
 {
     return virDomainObjListForEach(uml_driver->domains, iter, data);
 }