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

  /*
   *	IEEE 802.1Q Multiple VLAN Registration Protocol (MVRP)
   *
   *	Copyright (c) 2012 Massachusetts Institute of Technology
   *
   *	Adapted from code in net/8021q/vlan_gvrp.c
   *	Copyright (c) 2008 Patrick McHardy <kaber@trash.net>

   */
  #include <linux/types.h>
  #include <linux/if_ether.h>
  #include <linux/if_vlan.h>
  #include <net/mrp.h>
  #include "vlan.h"
  
  #define MRP_MVRP_ADDRESS	{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x21 }
  
  enum mvrp_attributes {
  	MVRP_ATTR_INVALID,
  	MVRP_ATTR_VID,
  	__MVRP_ATTR_MAX
  };
  #define MVRP_ATTR_MAX	(__MVRP_ATTR_MAX - 1)
  
  static struct mrp_application vlan_mrp_app __read_mostly = {
  	.type		= MRP_APPLICATION_MVRP,
  	.maxattr	= MVRP_ATTR_MAX,
  	.pkttype.type	= htons(ETH_P_MVRP),
  	.group_address	= MRP_MVRP_ADDRESS,
  	.version	= 0,
  };
  
  int vlan_mvrp_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 mrp_request_join(vlan->real_dev, &vlan_mrp_app,
  				&vlan_id, sizeof(vlan_id), MVRP_ATTR_VID);
  }
  
  void vlan_mvrp_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;

  	mrp_request_leave(vlan->real_dev, &vlan_mrp_app,
  			  &vlan_id, sizeof(vlan_id), MVRP_ATTR_VID);
  }
  
  int vlan_mvrp_init_applicant(struct net_device *dev)
  {
  	return mrp_init_applicant(dev, &vlan_mrp_app);
  }
  
  void vlan_mvrp_uninit_applicant(struct net_device *dev)
  {
  	mrp_uninit_applicant(dev, &vlan_mrp_app);
  }
  
  int __init vlan_mvrp_init(void)
  {
  	return mrp_register_application(&vlan_mrp_app);
  }
  
  void vlan_mvrp_uninit(void)
  {
  	mrp_unregister_application(&vlan_mrp_app);
  }