[libvirt] [PATCH v3 16/20] nwfilter: keep track of active filter bindings

[Daniel P. Berrangé]

Currently the nwfilter driver does not keep any record of what filter
bindings it has active. This means that when it needs to recreate
filters, it has to rely on triggering callbacks provided by the virt
drivers. This introduces a hash table recording the virNWFilterBinding
objects so the driver has a record of all active filters.

Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
---
 src/conf/virnwfilterobj.h      |  4 ++
 src/nwfilter/nwfilter_driver.c | 86 ++++++++++++++++++++++++----------
 2 files changed, 65 insertions(+), 25 deletions(-)

diff --git a/src/conf/virnwfilterobj.h b/src/conf/virnwfilterobj.h
index 433b0402d0..4a54dd50da 100644
--- a/src/conf/virnwfilterobj.h
+++ b/src/conf/virnwfilterobj.h
@@ -22,6 +22,7 @@
 # include "internal.h"
 
 # include "nwfilter_conf.h"
+# include "virnwfilterbindingobjlist.h"
 
 typedef struct _virNWFilterObj virNWFilterObj;
 typedef virNWFilterObj *virNWFilterObjPtr;
@@ -37,7 +38,10 @@ struct _virNWFilterDriverState {
 
     virNWFilterObjListPtr nwfilters;
 
+    virNWFilterBindingObjListPtr bindings;
+
     char *configDir;
+    char *bindingDir;
 };
 
 virNWFilterDefPtr
diff --git a/src/nwfilter/nwfilter_driver.c b/src/nwfilter/nwfilter_driver.c
index 7202691646..2388e925fc 100644
--- a/src/nwfilter/nwfilter_driver.c
+++ b/src/nwfilter/nwfilter_driver.c
@@ -38,7 +38,6 @@
 #include "domain_conf.h"
 #include "domain_nwfilter.h"
 #include "nwfilter_driver.h"
-#include "virnwfilterbindingdef.h"
 #include "nwfilter_gentech_driver.h"
 #include "configmake.h"
 #include "virfile.h"
@@ -174,7 +173,6 @@ nwfilterStateInitialize(bool privileged,
                         virStateInhibitCallback callback ATTRIBUTE_UNUSED,
                         void *opaque ATTRIBUTE_UNUSED)
 {
-    char *base = NULL;
     DBusConnection *sysbus = NULL;
 
     if (virDBusHasSystemBus() &&
@@ -191,6 +189,9 @@ nwfilterStateInitialize(bool privileged,
     if (!(driver->nwfilters = virNWFilterObjListNew()))
         goto error;
 
+    if (!(driver->bindings = virNWFilterBindingObjListNew()))
+        goto error;
+
     if (!privileged)
         return 0;
 
@@ -230,30 +231,35 @@ nwfilterStateInitialize(bool privileged,
         goto error;
     }
 
-    if (VIR_STRDUP(base, SYSCONFDIR "/libvirt") < 0)
+    if (VIR_STRDUP(driver->configDir, SYSCONFDIR "/libvirt/nwfilter") < 0)
         goto error;
 
-    if (virAsprintf(&driver->configDir,
-                    "%s/nwfilter", base) == -1)
+    if (virFileMakePathWithMode(driver->configDir, S_IRWXU) < 0) {
+        virReportSystemError(errno, _("cannot create config directory '%s'"),
+                             driver->configDir);
         goto error;
+    }
 
-    VIR_FREE(base);
+    if (VIR_STRDUP(driver->bindingDir, LOCALSTATEDIR "/run/libvirt/nwfilter-binding") < 0)
+        goto error;
 
-    if (virFileMakePathWithMode(driver->configDir, S_IRWXU) < 0) {
+    if (virFileMakePathWithMode(driver->bindingDir, S_IRWXU) < 0) {
         virReportSystemError(errno, _("cannot create config directory '%s'"),
-                             driver->configDir);
+                             driver->bindingDir);
         goto error;
     }
 
     if (virNWFilterObjListLoadAllConfigs(driver->nwfilters, driver->configDir) < 0)
         goto error;
 
+    if (virNWFilterBindingObjListLoadAllConfigs(driver->bindings, driver->bindingDir) < 0)
+        goto error;
+
     nwfilterDriverUnlock();
 
     return 0;
 
  error:
-    VIR_FREE(base);
     nwfilterDriverUnlock();
     nwfilterStateCleanup();
 
@@ -333,9 +339,12 @@ nwfilterStateCleanup(void)
         nwfilterDriverRemoveDBusMatches();
 
         VIR_FREE(driver->configDir);
+        VIR_FREE(driver->bindingDir);
         nwfilterDriverUnlock();
     }
 
+    virObjectUnref(driver->bindings);
+
     /* free inactive nwfilters */
     virNWFilterObjListFree(driver->nwfilters);
 
@@ -647,13 +656,37 @@ nwfilterInstantiateFilter(const char *vmname,
                           const unsigned char *vmuuid,
                           virDomainNetDefPtr net)
 {
-    virNWFilterBindingDefPtr binding;
+    virNWFilterBindingObjPtr obj;
+    virNWFilterBindingDefPtr def;
     int ret;
 
-    if (!(binding = virNWFilterBindingDefForNet(vmname, vmuuid, net)))
+    obj = virNWFilterBindingObjListFindByPortDev(driver->bindings, net->ifname);
+    if (obj) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Filter already present for NIC %s"), net->ifname);
+        virNWFilterBindingObjEndAPI(&obj);
+        return -1;
+    }
+
+    if (!(def = virNWFilterBindingDefForNet(vmname, vmuuid, net)))
         return -1;
-    ret = virNWFilterInstantiateFilter(driver, binding);
-    virNWFilterBindingDefFree(binding);
+
+    obj = virNWFilterBindingObjListAdd(driver->bindings,
+                                       def);
+    if (!obj) {
+        virNWFilterBindingDefFree(def);
+        return -1;
+    }
+
+    ret = virNWFilterInstantiateFilter(driver, def);
+
+    if (ret >= 0)
+        virNWFilterBindingObjSave(obj, driver->bindingDir);
+    else
+        virNWFilterBindingObjListRemove(driver->bindings, obj);
+
+    virNWFilterBindingObjEndAPI(&obj);
+
     return ret;
 }
 
@@ -661,18 +694,21 @@ nwfilterInstantiateFilter(const char *vmname,
 static void
 nwfilterTeardownFilter(virDomainNetDefPtr net)
 {
-    virNWFilterBindingDef binding = {
-        .portdevname = net->ifname,
-        .linkdevname = (net->type == VIR_DOMAIN_NET_TYPE_DIRECT ?
-                        net->data.direct.linkdev : NULL),
-        .mac = net->mac,
-        .filter = net->filter,
-        .filterparams = net->filterparams,
-        .ownername = NULL,
-        .owneruuid = {0},
-    };
-    if ((net->ifname) && (net->filter))
-        virNWFilterTeardownFilter(&binding);
+    virNWFilterBindingObjPtr obj;
+    virNWFilterBindingDefPtr def;
+    if (!net->ifname)
+        return;
+
+    obj = virNWFilterBindingObjListFindByPortDev(driver->bindings, net->ifname);
+    if (!obj)
+        return;
+
+    def = virNWFilterBindingObjGetDef(obj);
+    virNWFilterTeardownFilter(def);
+    virNWFilterBindingObjDelete(obj, driver->bindingDir);
+
+    virNWFilterBindingObjListRemove(driver->bindings, obj);
+    virNWFilterBindingObjEndAPI(&obj);
 }
 
 
-- 
2.17.0