netfilter: print filter info associate with the netdev

When execute "info network", print filter info also.
add a info_str member to NetFilterState, store specific filters
info.

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

include/net/filter.h

@@ -55,6 +55,7 @@ struct NetFilterState {
     char *netdev_id;
     NetClientState *netdev;
     NetFilterDirection direction;
+    char info_str[256];
     QTAILQ_ENTRY(NetFilterState) next;
 };
 

net/filter.c

@@ -15,6 +15,7 @@
 #include "net/vhost_net.h"
 #include "qom/object_interfaces.h"
 #include "qemu/iov.h"
+#include "qapi/string-output-visitor.h"
 
 ssize_t qemu_netfilter_receive(NetFilterState *nf,
                                NetFilterDirection direction,
@@ -134,6 +135,9 @@ static void netfilter_complete(UserCreatable *uc, Error **errp)
     NetFilterClass *nfc = NETFILTER_GET_CLASS(uc);
     int queues;
     Error *local_err = NULL;
+    char *str, *info;
+    ObjectProperty *prop;
+    StringOutputVisitor *ov;
 
     if (!nf->netdev_id) {
         error_setg(errp, "Parameter 'netdev' is required");
@@ -167,6 +171,22 @@ static void netfilter_complete(UserCreatable *uc, Error **errp)
         }
     }
     QTAILQ_INSERT_TAIL(&nf->netdev->filters, nf, next);
+
+    /* generate info str */
+    QTAILQ_FOREACH(prop, &OBJECT(nf)->properties, node) {
+        if (!strcmp(prop->name, "type")) {
+            continue;
+        }
+        ov = string_output_visitor_new(false);
+        object_property_get(OBJECT(nf), string_output_get_visitor(ov),
+                            prop->name, errp);
+        str = string_output_get_string(ov);
+        string_output_visitor_cleanup(ov);
+        info = g_strdup_printf(",%s=%s", prop->name, str);
+        g_strlcat(nf->info_str, info, sizeof(nf->info_str));
+        g_free(str);
+        g_free(info);
+    }
 }
 
 static void netfilter_finalize(Object *obj)

net/net.c

@@ -1179,10 +1179,21 @@ void qmp_netdev_del(const char *id, Error **errp)
 
 void print_net_client(Monitor *mon, NetClientState *nc)
 {
+    NetFilterState *nf;
+
     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
                    nc->queue_index,
                    NetClientOptionsKind_lookup[nc->info->type],
                    nc->info_str);
+    if (!QTAILQ_EMPTY(&nc->filters)) {
+        monitor_printf(mon, "filters:\n");
+    }
+    QTAILQ_FOREACH(nf, &nc->filters, next) {
+        monitor_printf(mon, "  - %s: type=%s%s\n",
+                       object_get_canonical_path_component(OBJECT(nf)),
+                       object_get_typename(OBJECT(nf)),
+                       nf->info_str);
+    }
 }
 
 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,