From 2c313ae2a0676d79eaa260a2cba64d93feb0683f Mon Sep 17 00:00:00 2001
From: Vladislav Yaroshchuk <vladislav.yaroshchuk@jetbrains.com>
Date: Thu, 17 Mar 2022 20:28:37 +0300
Subject: [PATCH] net/vmnet: implement bridged mode (vmnet-bridged)

Reviewed-by: Akihiko Odaki <akihiko.odaki@gmail.com>
Tested-by: Akihiko Odaki <akihiko.odaki@gmail.com>
Signed-off-by: Vladislav Yaroshchuk <Vladislav.Yaroshchuk@jetbrains.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 net/vmnet-bridged.m | 137 ++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 132 insertions(+), 5 deletions(-)

diff --git a/net/vmnet-bridged.m b/net/vmnet-bridged.m
index 91c1a2f2c7..46d2282863 100644
--- a/net/vmnet-bridged.m
+++ b/net/vmnet-bridged.m
@@ -10,16 +10,143 @@
 
 #include "qemu/osdep.h"
 #include "qapi/qapi-types-net.h"
-#include "vmnet_int.h"
-#include "clients.h"
-#include "qemu/error-report.h"
 #include "qapi/error.h"
+#include "clients.h"
+#include "vmnet_int.h"
 
 #include <vmnet/vmnet.h>
 
+
+static bool validate_ifname(const char *ifname)
+{
+    xpc_object_t shared_if_list = vmnet_copy_shared_interface_list();
+    bool match = false;
+    if (!xpc_array_get_count(shared_if_list)) {
+        goto done;
+    }
+
+    match = !xpc_array_apply(
+        shared_if_list,
+        ^bool(size_t index, xpc_object_t value) {
+            return strcmp(xpc_string_get_string_ptr(value), ifname) != 0;
+        });
+
+done:
+    xpc_release(shared_if_list);
+    return match;
+}
+
+
+static char* get_valid_ifnames()
+{
+    xpc_object_t shared_if_list = vmnet_copy_shared_interface_list();
+    __block char *if_list = NULL;
+    __block char *if_list_prev = NULL;
+
+    if (!xpc_array_get_count(shared_if_list)) {
+        goto done;
+    }
+
+    xpc_array_apply(
+        shared_if_list,
+        ^bool(size_t index, xpc_object_t value) {
+            /* build list of strings like "en0 en1 en2 " */
+            if_list = g_strconcat(xpc_string_get_string_ptr(value),
+                                  " ",
+                                  if_list_prev,
+                                  NULL);
+            g_free(if_list_prev);
+            if_list_prev = if_list;
+            return true;
+        });
+
+done:
+    xpc_release(shared_if_list);
+    return if_list;
+}
+
+
+static bool validate_options(const Netdev *netdev, Error **errp)
+{
+    const NetdevVmnetBridgedOptions *options = &(netdev->u.vmnet_bridged);
+    char* if_list;
+
+    if (!validate_ifname(options->ifname)) {
+        if_list = get_valid_ifnames();
+        if (if_list) {
+            error_setg(errp,
+                       "unsupported ifname '%s', expected one of [ %s]",
+                       options->ifname,
+                       if_list);
+            g_free(if_list);
+        } else {
+            error_setg(errp,
+                       "unsupported ifname '%s', no supported "
+                       "interfaces available",
+                       options->ifname);
+        }
+        return false;
+    }
+
+#if !defined(MAC_OS_VERSION_11_0) || \
+    MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_VERSION_11_0
+    if (options->has_isolated) {
+        error_setg(errp,
+                   "vmnet-bridged.isolated feature is "
+                   "unavailable: outdated vmnet.framework API");
+        return false;
+    }
+#endif
+    return true;
+}
+
+
+static xpc_object_t build_if_desc(const Netdev *netdev)
+{
+    const NetdevVmnetBridgedOptions *options = &(netdev->u.vmnet_bridged);
+    xpc_object_t if_desc = xpc_dictionary_create(NULL, NULL, 0);
+
+    xpc_dictionary_set_uint64(if_desc,
+                              vmnet_operation_mode_key,
+                              VMNET_BRIDGED_MODE
+    );
+
+    xpc_dictionary_set_string(if_desc,
+                              vmnet_shared_interface_name_key,
+                              options->ifname);
+
+#if defined(MAC_OS_VERSION_11_0) && \
+    MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_VERSION_11_0
+    xpc_dictionary_set_bool(if_desc,
+                            vmnet_enable_isolation_key,
+                            options->isolated);
+#endif
+    return if_desc;
+}
+
+
+static NetClientInfo net_vmnet_bridged_info = {
+    .type = NET_CLIENT_DRIVER_VMNET_BRIDGED,
+    .size = sizeof(VmnetState),
+    .receive = vmnet_receive_common,
+    .cleanup = vmnet_cleanup_common,
+};
+
+
 int net_init_vmnet_bridged(const Netdev *netdev, const char *name,
                            NetClientState *peer, Error **errp)
 {
-  error_setg(errp, "vmnet-bridged is not implemented yet");
-  return -1;
+    NetClientState *nc = qemu_new_net_client(&net_vmnet_bridged_info,
+                                             peer, "vmnet-bridged", name);
+    xpc_object_t if_desc;
+    int result = -1;
+
+    if (!validate_options(netdev, errp)) {
+        return result;
+    }
+
+    if_desc = build_if_desc(netdev);
+    result = vmnet_if_create(nc, if_desc, errp);
+    xpc_release(if_desc);
+    return result;
 }