conf: introduce a virNWFilterBindingObjListPtr struct

Introduce a new struct to act as the manager of a collection of
virNWFilterBindingObjPtr objects.

Reviewed-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

src/conf/Makefile.inc.am

@@ -89,6 +89,8 @@ NWFILTER_CONF_SOURCES = \
 	conf/virnwfilterbindingdef.h \
 	conf/virnwfilterbindingobj.c \
 	conf/virnwfilterbindingobj.h \
+	conf/virnwfilterbindingobjlist.c \
+	conf/virnwfilterbindingobjlist.h \
 	$(NULL)
 
 STORAGE_CONF_SOURCES = \

src/conf/virnwfilterbindingobj.c

@@ -207,7 +207,7 @@ virNWFilterBindingObjParseXML(xmlDocPtr doc,
     if (!(ret = virNWFilterBindingObjNew()))
         return NULL;
 
-    if (!(node = virXPathNode("./filterbindingstatus", ctxt))) {
+    if (!(node = virXPathNode("./filterbinding", ctxt))) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                        _("filter binding status missing content"));
         goto cleanup;
@@ -231,9 +231,10 @@ virNWFilterBindingObjParseNode(xmlDocPtr doc,
     xmlXPathContextPtr ctxt = NULL;
     virNWFilterBindingObjPtr obj = NULL;
 
-    if (STRNEQ((const char *)root->name, "filterbinding")) {
-        virReportError(VIR_ERR_XML_ERROR, "%s",
-                       _("unknown root element for filter binding"));
+    if (STRNEQ((const char *)root->name, "filterbindingstatus")) {
+        virReportError(VIR_ERR_XML_ERROR,
+                       _("unknown root element '%s' for filter binding"),
+                       root->name);
         goto cleanup;
     }
 

src/conf/virnwfilterbindingobjlist.c

@@ -0,0 +1,487 @@
+/*
+ * virnwfilterbindingobjlist.c: nwfilter binding object list utilities
+ *
+ * Copyright (C) 2018 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, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Author: Daniel P. Berrange <berrange@redhat.com>
+ */
+
+#include <config.h>
+
+#include "internal.h"
+#include "datatypes.h"
+#include "virnwfilterbindingobjlist.h"
+#include "viralloc.h"
+#include "virfile.h"
+#include "virlog.h"
+#include "virstring.h"
+
+#define VIR_FROM_THIS VIR_FROM_NWFILTER
+
+VIR_LOG_INIT("conf.virnwfilterbindingobjlist");
+
+static virClassPtr virNWFilterBindingObjListClass;
+static void virNWFilterBindingObjListDispose(void *obj);
+
+struct _virNWFilterBindingObjList {
+    virObjectRWLockable parent;
+
+    /* port dev name -> virNWFilterBindingObj  mapping
+     * for O(1), lockless lookup-by-port dev */
+    virHashTable *objs;
+};
+
+
+static int virNWFilterBindingObjListOnceInit(void)
+{
+    if (!VIR_CLASS_NEW(virNWFilterBindingObjList, virClassForObjectRWLockable()))
+        return -1;
+
+    return 0;
+}
+
+VIR_ONCE_GLOBAL_INIT(virNWFilterBindingObjList)
+
+
+virNWFilterBindingObjListPtr
+virNWFilterBindingObjListNew(void)
+{
+    virNWFilterBindingObjListPtr bindings;
+
+    if (virNWFilterBindingObjListInitialize() < 0)
+        return NULL;
+
+    if (!(bindings = virObjectRWLockableNew(virNWFilterBindingObjListClass)))
+        return NULL;
+
+    if (!(bindings->objs = virHashCreate(50, virObjectFreeHashData))) {
+        virObjectUnref(bindings);
+        return NULL;
+    }
+
+    return bindings;
+}
+
+
+static void
+virNWFilterBindingObjListDispose(void *obj)
+{
+    virNWFilterBindingObjListPtr bindings = obj;
+
+    virHashFree(bindings->objs);
+}
+
+
+static virNWFilterBindingObjPtr
+virNWFilterBindingObjListFindByPortDevLocked(virNWFilterBindingObjListPtr bindings,
+                                             const char *name)
+{
+    virNWFilterBindingObjPtr obj;
+
+    obj = virHashLookup(bindings->objs, name);
+    virObjectRef(obj);
+    if (obj) {
+        virObjectLock(obj);
+        if (virNWFilterBindingObjGetRemoving(obj)) {
+            virObjectUnlock(obj);
+            virObjectUnref(obj);
+            obj = NULL;
+        }
+    }
+    return obj;
+}
+
+
+/**
+ * @bindings: NWFilterBinding object list
+ * @name: Name to search the bindings->objs table
+ *
+ * Lookup the @name in the bindings->objs hash table and return a
+ * locked and ref counted binding object if found. Caller is expected
+ * to use the virNWFilterBindingObjEndAPI when done with the object.
+ */
+virNWFilterBindingObjPtr
+virNWFilterBindingObjListFindByPortDev(virNWFilterBindingObjListPtr bindings,
+                                       const char *name)
+{
+    virNWFilterBindingObjPtr obj;
+
+    virObjectRWLockRead(bindings);
+    obj = virNWFilterBindingObjListFindByPortDevLocked(bindings, name);
+    virObjectRWUnlock(bindings);
+
+    return obj;
+}
+
+
+/**
+ * @bindings: NWFilterBinding object list pointer
+ * @binding: NWFilterBinding object to be added
+ *
+ * Upon entry @binding should have at least 1 ref and be locked.
+ *
+ * Add the @binding into the @bindings->objs hash
+ * tables. Once successfully added into a table, increase the
+ * reference count since upon removal in virHashRemoveEntry
+ * the virObjectUnref will be called since the hash tables were
+ * configured to call virObjectFreeHashData when the object is
+ * removed from the hash table.
+ *
+ * Returns 0 on success with 2 references and locked
+ *        -1 on failure with 1 reference and locked
+ */
+static int
+virNWFilterBindingObjListAddObjLocked(virNWFilterBindingObjListPtr bindings,
+                                      virNWFilterBindingObjPtr binding)
+{
+    virNWFilterBindingDefPtr def = virNWFilterBindingObjGetDef(binding);
+    if (virHashAddEntry(bindings->objs, def->portdevname, binding) < 0)
+        return -1;
+    virObjectRef(binding);
+
+    return 0;
+}
+
+
+/*
+ * virNWFilterBindingObjListAddLocked:
+ *
+ * The returned @binding from this function will be locked and ref
+ * counted. The caller is expected to use virNWFilterBindingObjEndAPI
+ * when it completes usage.
+ */
+static virNWFilterBindingObjPtr
+virNWFilterBindingObjListAddLocked(virNWFilterBindingObjListPtr bindings,
+                                   virNWFilterBindingDefPtr def)
+{
+    virNWFilterBindingObjPtr binding;
+
+    /* See if a binding with matching portdev already exists */
+    if ((binding = virNWFilterBindingObjListFindByPortDevLocked(
+             bindings, def->portdevname))) {
+        virReportError(VIR_ERR_OPERATION_FAILED,
+                       _("binding '%s' already exists"),
+                       def->portdevname);
+        goto error;
+    }
+
+    if (!(binding = virNWFilterBindingObjNew()))
+        goto error;
+
+    virNWFilterBindingObjSetDef(binding, def);
+
+    if (virNWFilterBindingObjListAddObjLocked(bindings, binding) < 0)
+        goto error;
+
+    return binding;
+
+ error:
+    virNWFilterBindingObjEndAPI(&binding);
+    return NULL;
+}
+
+
+virNWFilterBindingObjPtr
+virNWFilterBindingObjListAdd(virNWFilterBindingObjListPtr bindings,
+                             virNWFilterBindingDefPtr def)
+{
+    virNWFilterBindingObjPtr ret;
+
+    virObjectRWLockWrite(bindings);
+    ret = virNWFilterBindingObjListAddLocked(bindings, def);
+    virObjectRWUnlock(bindings);
+    return ret;
+}
+
+
+/* The caller must hold lock on 'bindings' in addition to 'virNWFilterBindingObjListRemove'
+ * requirements
+ *
+ * Can be used to remove current element while iterating with
+ * virNWFilterBindingObjListForEach
+ */
+static void
+virNWFilterBindingObjListRemoveLocked(virNWFilterBindingObjListPtr bindings,
+                                      virNWFilterBindingObjPtr binding)
+{
+    virNWFilterBindingDefPtr def = virNWFilterBindingObjGetDef(binding);
+    virHashRemoveEntry(bindings->objs, def->portdevname);
+}
+
+
+/**
+ * @bindings: Pointer to the binding object list
+ * @binding: NWFilterBinding pointer from either after Add or FindBy* API where the
+ *       @binding was successfully added to the bindings->objs
+ *       hash tables that now would need to be removed.
+ *
+ * The caller must hold a lock on the driver owning 'bindings',
+ * and must also have locked and ref counted 'binding', to ensure
+ * no one else is either waiting for 'binding' or still using it.
+ *
+ * When this function returns, @binding will be removed from the hash
+ * tables and returned with lock and refcnt that was present upon entry.
+ */
+void
+virNWFilterBindingObjListRemove(virNWFilterBindingObjListPtr bindings,
+                                virNWFilterBindingObjPtr binding)
+{
+    virNWFilterBindingObjSetRemoving(binding, true);
+    virObjectRef(binding);
+    virObjectUnlock(binding);
+    virObjectRWLockWrite(bindings);
+    virObjectLock(binding);
+    virNWFilterBindingObjListRemoveLocked(bindings, binding);
+    virObjectUnref(binding);
+    virObjectRWUnlock(bindings);
+}
+
+
+static virNWFilterBindingObjPtr
+virNWFilterBindingObjListLoadStatus(virNWFilterBindingObjListPtr bindings,
+                                    const char *statusDir,
+                                    const char *name)
+{
+    char *statusFile = NULL;
+    virNWFilterBindingObjPtr obj = NULL;
+    virNWFilterBindingDefPtr def;
+
+    if ((statusFile = virNWFilterBindingObjConfigFile(statusDir, name)) == NULL)
+        goto error;
+
+    if (!(obj = virNWFilterBindingObjParseFile(statusFile)))
+        goto error;
+
+    def = virNWFilterBindingObjGetDef(obj);
+    if (virHashLookup(bindings->objs, def->portdevname) != NULL) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("unexpected binding %s already exists"),
+                       def->portdevname);
+        goto error;
+    }
+
+    if (virNWFilterBindingObjListAddObjLocked(bindings, obj) < 0)
+        goto error;
+
+    VIR_FREE(statusFile);
+    return obj;
+
+ error:
+    virNWFilterBindingObjEndAPI(&obj);
+    VIR_FREE(statusFile);
+    return NULL;
+}
+
+
+int
+virNWFilterBindingObjListLoadAllConfigs(virNWFilterBindingObjListPtr bindings,
+                                        const char *configDir)
+{
+    DIR *dir;
+    struct dirent *entry;
+    int ret = -1;
+    int rc;
+
+    VIR_INFO("Scanning for configs in %s", configDir);
+
+    if ((rc = virDirOpenIfExists(&dir, configDir)) <= 0)
+        return rc;
+
+    virObjectRWLockWrite(bindings);
+
+    while ((ret = virDirRead(dir, &entry, configDir)) > 0) {
+        virNWFilterBindingObjPtr binding;
+
+        if (!virFileStripSuffix(entry->d_name, ".xml"))
+            continue;
+
+        /* NB: ignoring errors, so one malformed config doesn't
+           kill the whole process */
+        VIR_INFO("Loading config file '%s.xml'", entry->d_name);
+        binding = virNWFilterBindingObjListLoadStatus(bindings,
+                                                      configDir,
+                                                      entry->d_name);
+        if (binding)
+            virNWFilterBindingObjEndAPI(&binding);
+        else
+            VIR_ERROR(_("Failed to load config for binding '%s'"), entry->d_name);
+    }
+
+    VIR_DIR_CLOSE(dir);
+    virObjectRWUnlock(bindings);
+    return ret;
+}
+
+
+struct virNWFilterBindingListIterData {
+    virNWFilterBindingObjListIterator callback;
+    void *opaque;
+    int ret;
+};
+
+
+static int
+virNWFilterBindingObjListHelper(void *payload,
+                                const void *name ATTRIBUTE_UNUSED,
+                                void *opaque)
+{
+    struct virNWFilterBindingListIterData *data = opaque;
+
+    if (data->callback(payload, data->opaque) < 0)
+        data->ret = -1;
+    return 0;
+}
+
+
+int
+virNWFilterBindingObjListForEach(virNWFilterBindingObjListPtr bindings,
+                                 virNWFilterBindingObjListIterator callback,
+                                 void *opaque)
+{
+    struct virNWFilterBindingListIterData data = {
+        callback, opaque, 0,
+    };
+    virObjectRWLockRead(bindings);
+    virHashForEach(bindings->objs, virNWFilterBindingObjListHelper, &data);
+    virObjectRWUnlock(bindings);
+    return data.ret;
+}
+
+
+struct virNWFilterBindingListData {
+    virNWFilterBindingObjPtr *bindings;
+    size_t nbindings;
+};
+
+
+static int
+virNWFilterBindingObjListCollectIterator(void *payload,
+                                         const void *name ATTRIBUTE_UNUSED,
+                                         void *opaque)
+{
+    struct virNWFilterBindingListData *data = opaque;
+
+    data->bindings[data->nbindings++] = virObjectRef(payload);
+    return 0;
+}
+
+
+static void
+virNWFilterBindingObjListFilter(virNWFilterBindingObjPtr **list,
+                                size_t *nbindings,
+                                virConnectPtr conn,
+                                virNWFilterBindingObjListACLFilter filter)
+{
+    size_t i = 0;
+
+    while (i < *nbindings) {
+        virNWFilterBindingObjPtr binding = (*list)[i];
+        virNWFilterBindingDefPtr def;
+
+        virObjectLock(binding);
+
+        def = virNWFilterBindingObjGetDef(binding);
+        /* do not list the object if:
+         * 1) it's being removed.
+         * 2) connection does not have ACL to see it
+         * 3) it doesn't match the filter
+         */
+        if (virNWFilterBindingObjGetRemoving(binding) ||
+            (filter && !filter(conn, def))) {
+            virObjectUnlock(binding);
+            virObjectUnref(binding);
+            VIR_DELETE_ELEMENT(*list, i, *nbindings);
+            continue;
+        }
+
+        virObjectUnlock(binding);
+        i++;
+    }
+}
+
+
+static int
+virNWFilterBindingObjListCollect(virNWFilterBindingObjListPtr domlist,
+                                 virConnectPtr conn,
+                                 virNWFilterBindingObjPtr **bindings,
+                                 size_t *nbindings,
+                                 virNWFilterBindingObjListACLFilter filter)
+{
+    struct virNWFilterBindingListData data = { NULL, 0 };
+
+    virObjectRWLockRead(domlist);
+    sa_assert(domlist->objs);
+    if (VIR_ALLOC_N(data.bindings, virHashSize(domlist->objs)) < 0) {
+        virObjectRWUnlock(domlist);
+        return -1;
+    }
+
+    virHashForEach(domlist->objs, virNWFilterBindingObjListCollectIterator, &data);
+    virObjectRWUnlock(domlist);
+
+    virNWFilterBindingObjListFilter(&data.bindings, &data.nbindings, conn, filter);
+
+    *nbindings = data.nbindings;
+    *bindings = data.bindings;
+
+    return 0;
+}
+
+
+int
+virNWFilterBindingObjListExport(virNWFilterBindingObjListPtr bindings,
+                                virConnectPtr conn,
+                                virNWFilterBindingPtr **bindinglist,
+                                virNWFilterBindingObjListACLFilter filter)
+{
+    virNWFilterBindingObjPtr *bindingobjs = NULL;
+    size_t nbindings = 0;
+    size_t i;
+    int ret = -1;
+
+    if (virNWFilterBindingObjListCollect(bindings, conn, &bindingobjs,
+                                         &nbindings, filter) < 0)
+        return -1;
+
+    if (bindinglist) {
+        if (VIR_ALLOC_N(*bindinglist, nbindings + 1) < 0)
+            goto cleanup;
+
+        for (i = 0; i < nbindings; i++) {
+            virNWFilterBindingObjPtr binding = bindingobjs[i];
+            virNWFilterBindingDefPtr def = virNWFilterBindingObjGetDef(binding);
+
+            virObjectLock(binding);
+            (*bindinglist)[i] = virGetNWFilterBinding(conn, def->portdevname,
+                                                      def->filter);
+            virObjectUnlock(binding);
+
+            if (!(*bindinglist)[i])
+                goto cleanup;
+        }
+    }
+
+    ret = nbindings;
+
+ cleanup:
+    virObjectListFreeCount(bindingobjs, nbindings);
+    if (ret < 0) {
+        virObjectListFreeCount(*bindinglist, nbindings);
+        *bindinglist = NULL;
+    }
+    return ret;
+}

src/conf/virnwfilterbindingobjlist.h

@@ -0,0 +1,69 @@
+/*
+ * virnwfilterbindingobjlist.h: nwfilter binding object list utilities
+ *
+ * Copyright (C) 2018 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, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Author: Daniel P. Berrange <berrange@redhat.com>
+ */
+
+#ifndef __VIR_NWFILTER_BINDING_OBJ_LIST_H__
+# define __VIR_NWFILTER_BINDING_OBJ_LIST_H__
+
+# include "virnwfilterbindingobj.h"
+
+typedef struct _virNWFilterBindingObjList virNWFilterBindingObjList;
+typedef virNWFilterBindingObjList *virNWFilterBindingObjListPtr;
+
+virNWFilterBindingObjListPtr
+virNWFilterBindingObjListNew(void);
+
+virNWFilterBindingObjPtr
+virNWFilterBindingObjListFindByPortDev(virNWFilterBindingObjListPtr bindings,
+                                       const char *name);
+
+virNWFilterBindingObjPtr
+virNWFilterBindingObjListAdd(virNWFilterBindingObjListPtr bindings,
+                             virNWFilterBindingDefPtr def);
+
+void
+virNWFilterBindingObjListRemove(virNWFilterBindingObjListPtr bindings,
+                                virNWFilterBindingObjPtr binding);
+
+int
+virNWFilterBindingObjListLoadAllConfigs(virNWFilterBindingObjListPtr bindings,
+                                        const char *configDir);
+
+
+typedef int (*virNWFilterBindingObjListIterator)(virNWFilterBindingObjPtr binding,
+                                                 void *opaque);
+
+int
+virNWFilterBindingObjListForEach(virNWFilterBindingObjListPtr bindings,
+                                 virNWFilterBindingObjListIterator callback,
+                                 void *opaque);
+
+typedef bool (*virNWFilterBindingObjListACLFilter)(virConnectPtr conn,
+                                                   virNWFilterBindingDefPtr def);
+
+int
+virNWFilterBindingObjListExport(virNWFilterBindingObjListPtr bindings,
+                                virConnectPtr conn,
+                                virNWFilterBindingPtr **bindinglist,
+                                virNWFilterBindingObjListACLFilter filter);
+
+
+#endif /* __VIR_NWFILTER_BINDING_OBJ_LIST_H__ */

src/libvirt_private.syms

@@ -1071,6 +1071,16 @@ virNWFilterBindingObjSetDef;
 virNWFilterBindingObjSetRemoving;
 
 
+# conf/virnwfilterbindingobjlist.h
+virNWFilterBindingObjListAdd;
+virNWFilterBindingObjListExport;
+virNWFilterBindingObjListFindByPortDev;
+virNWFilterBindingObjListForEach;
+virNWFilterBindingObjListLoadAllConfigs;
+virNWFilterBindingObjListNew;
+virNWFilterBindingObjListRemove;
+
+
 # conf/virnwfilterobj.h
 virNWFilterObjGetDef;
 virNWFilterObjGetNewDef;