init/cleanup of netfilter object

Add a netfilter object based on QOM.

A netfilter is attached to a netdev, captures all network packets
that pass through the netdev. When we delete the netdev, we also
delete the netfilter object attached to it, because if the netdev is
removed, the filter which attached to it is useless.

Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

net/Makefile.objs

@@ -13,3 +13,4 @@ common-obj-$(CONFIG_HAIKU) += tap-haiku.o
 common-obj-$(CONFIG_SLIRP) += slirp.o
 common-obj-$(CONFIG_VDE) += vde.o
 common-obj-$(CONFIG_NETMAP) += netmap.o
+common-obj-y += filter.o

net/filter.c

@@ -0,0 +1,138 @@
+/*
+ * Copyright (c) 2015 FUJITSU LIMITED
+ * Author: Yang Hongyang <yanghy@cn.fujitsu.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later.  See the COPYING file in the top-level directory.
+ */
+
+#include "qemu-common.h"
+#include "qapi/qmp/qerror.h"
+#include "qemu/error-report.h"
+
+#include "net/filter.h"
+#include "net/net.h"
+#include "net/vhost_net.h"
+#include "qom/object_interfaces.h"
+
+static char *netfilter_get_netdev_id(Object *obj, Error **errp)
+{
+    NetFilterState *nf = NETFILTER(obj);
+
+    return g_strdup(nf->netdev_id);
+}
+
+static void netfilter_set_netdev_id(Object *obj, const char *str, Error **errp)
+{
+    NetFilterState *nf = NETFILTER(obj);
+
+    nf->netdev_id = g_strdup(str);
+}
+
+static int netfilter_get_direction(Object *obj, Error **errp G_GNUC_UNUSED)
+{
+    NetFilterState *nf = NETFILTER(obj);
+    return nf->direction;
+}
+
+static void netfilter_set_direction(Object *obj, int direction, Error **errp)
+{
+    NetFilterState *nf = NETFILTER(obj);
+    nf->direction = direction;
+}
+
+static void netfilter_init(Object *obj)
+{
+    object_property_add_str(obj, "netdev",
+                            netfilter_get_netdev_id, netfilter_set_netdev_id,
+                            NULL);
+    object_property_add_enum(obj, "queue", "NetFilterDirection",
+                             NetFilterDirection_lookup,
+                             netfilter_get_direction, netfilter_set_direction,
+                             NULL);
+}
+
+static void netfilter_complete(UserCreatable *uc, Error **errp)
+{
+    NetFilterState *nf = NETFILTER(uc);
+    NetClientState *ncs[MAX_QUEUE_NUM];
+    NetFilterClass *nfc = NETFILTER_GET_CLASS(uc);
+    int queues;
+    Error *local_err = NULL;
+
+    if (!nf->netdev_id) {
+        error_setg(errp, "Parameter 'netdev' is required");
+        return;
+    }
+
+    queues = qemu_find_net_clients_except(nf->netdev_id, ncs,
+                                          NET_CLIENT_OPTIONS_KIND_NIC,
+                                          MAX_QUEUE_NUM);
+    if (queues < 1) {
+        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "netdev",
+                   "a network backend id");
+        return;
+    } else if (queues > 1) {
+        error_setg(errp, "multiqueue is not supported");
+        return;
+    }
+
+    if (get_vhost_net(ncs[0])) {
+        error_setg(errp, "Vhost is not supported");
+        return;
+    }
+
+    nf->netdev = ncs[0];
+
+    if (nfc->setup) {
+        nfc->setup(nf, &local_err);
+        if (local_err) {
+            error_propagate(errp, local_err);
+            return;
+        }
+    }
+    QTAILQ_INSERT_TAIL(&nf->netdev->filters, nf, next);
+}
+
+static void netfilter_finalize(Object *obj)
+{
+    NetFilterState *nf = NETFILTER(obj);
+    NetFilterClass *nfc = NETFILTER_GET_CLASS(obj);
+
+    if (nfc->cleanup) {
+        nfc->cleanup(nf);
+    }
+
+    if (nf->netdev && !QTAILQ_EMPTY(&nf->netdev->filters)) {
+        QTAILQ_REMOVE(&nf->netdev->filters, nf, next);
+    }
+}
+
+static void netfilter_class_init(ObjectClass *oc, void *data)
+{
+    UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
+
+    ucc->complete = netfilter_complete;
+}
+
+static const TypeInfo netfilter_info = {
+    .name = TYPE_NETFILTER,
+    .parent = TYPE_OBJECT,
+    .abstract = true,
+    .class_size = sizeof(NetFilterClass),
+    .class_init = netfilter_class_init,
+    .instance_size = sizeof(NetFilterState),
+    .instance_init = netfilter_init,
+    .instance_finalize = netfilter_finalize,
+    .interfaces = (InterfaceInfo[]) {
+        { TYPE_USER_CREATABLE },
+        { }
+    }
+};
+
+static void register_types(void)
+{
+    type_register_static(&netfilter_info);
+}
+
+type_init(register_types);

net/net.c

@@ -44,6 +44,7 @@
 #include "qapi/opts-visitor.h"
 #include "qapi/dealloc-visitor.h"
 #include "sysemu/sysemu.h"
+#include "net/filter.h"
 
 /* Net bridge is currently not supported for W32. */
 #if !defined(_WIN32)
@@ -287,6 +288,7 @@ static void qemu_net_client_setup(NetClientState *nc,
 
     nc->incoming_queue = qemu_new_net_queue(nc);
     nc->destructor = destructor;
+    QTAILQ_INIT(&nc->filters);
 }
 
 NetClientState *qemu_new_net_client(NetClientInfo *info,
@@ -384,6 +386,7 @@ void qemu_del_net_client(NetClientState *nc)
 {
     NetClientState *ncs[MAX_QUEUE_NUM];
     int queues, i;
+    NetFilterState *nf, *next;
 
     assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
 
@@ -395,6 +398,10 @@ void qemu_del_net_client(NetClientState *nc)
                                           MAX_QUEUE_NUM);
     assert(queues != 0);
 
+    QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
+        object_unparent(OBJECT(nf));
+    }
+
     /* If there is a peer NIC, delete and cleanup client, but do not free. */
     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
         NICState *nic = qemu_get_nic(nc->peer);