// SPDX-License-Identifier: GPL-2.0-only

  /*
   * 	IEEE 802.1Q GARP VLAN Registration Protocol (GVRP)
   *
   * 	Copyright (c) 2008 Patrick McHardy <kaber@trash.net>

   */
  #include <linux/types.h>
  #include <linux/if_vlan.h>
  #include <net/garp.h>
  #include "vlan.h"
  
  #define GARP_GVRP_ADDRESS	{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x21 }
  
  enum gvrp_attributes {
  	GVRP_ATTR_INVALID,
  	GVRP_ATTR_VID,
  	__GVRP_ATTR_MAX
  };
  #define GVRP_ATTR_MAX	(__GVRP_ATTR_MAX - 1)
  
  static struct garp_application vlan_gvrp_app __read_mostly = {
  	.proto.group_address	= GARP_GVRP_ADDRESS,
  	.maxattr		= GVRP_ATTR_MAX,
  	.type			= GARP_APPLICATION_GVRP,
  };
  
  int vlan_gvrp_request_join(const struct net_device *dev)
  {

  	const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);

  	__be16 vlan_id = htons(vlan->vlan_id);

  	if (vlan->vlan_proto != htons(ETH_P_8021Q))
  		return 0;

  	return garp_request_join(vlan->real_dev, &vlan_gvrp_app,

  				 &vlan_id, sizeof(vlan_id), GVRP_ATTR_VID);

  }
  
  void vlan_gvrp_request_leave(const struct net_device *dev)
  {

  	const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);

  	__be16 vlan_id = htons(vlan->vlan_id);

  	if (vlan->vlan_proto != htons(ETH_P_8021Q))
  		return;

  	garp_request_leave(vlan->real_dev, &vlan_gvrp_app,

  			   &vlan_id, sizeof(vlan_id), GVRP_ATTR_VID);

  }
  
  int vlan_gvrp_init_applicant(struct net_device *dev)
  {
  	return garp_init_applicant(dev, &vlan_gvrp_app);
  }
  
  void vlan_gvrp_uninit_applicant(struct net_device *dev)
  {
  	garp_uninit_applicant(dev, &vlan_gvrp_app);
  }
  
  int __init vlan_gvrp_init(void)
  {
  	return garp_register_application(&vlan_gvrp_app);
  }
  
  void vlan_gvrp_uninit(void)
  {
  	garp_unregister_application(&vlan_gvrp_app);
  }