net/8021q/vlan_gvrp.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *      IEEE 802.1Q GARP VLAN Registration Protocol (GVRP)
   4  *
   5  *      Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
   6  */
   7 #include <linux/types.h>
   8 #include <linux/if_vlan.h>
   9 #include <net/garp.h>
  10 #include "vlan.h"
  11
  12 #define GARP_GVRP_ADDRESS       { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x21 }
  13
  14 enum gvrp_attributes {
  15         GVRP_ATTR_INVALID,
  16         GVRP_ATTR_VID,
  17         __GVRP_ATTR_MAX
  18 };
  19 #define GVRP_ATTR_MAX   (__GVRP_ATTR_MAX - 1)
  20
  21 static struct garp_application vlan_gvrp_app __read_mostly = {
  22         .proto.group_address    = GARP_GVRP_ADDRESS,
  23         .maxattr                = GVRP_ATTR_MAX,
  24         .type                   = GARP_APPLICATION_GVRP,
  25 };
  26
  27 int vlan_gvrp_request_join(const struct net_device *dev)
  28 {
  29         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  30         __be16 vlan_id = htons(vlan->vlan_id);
  31
  32         if (vlan->vlan_proto != htons(ETH_P_8021Q))
  33                 return 0;
  34         return garp_request_join(vlan->real_dev, &vlan_gvrp_app,
  35                                  &vlan_id, sizeof(vlan_id), GVRP_ATTR_VID);
  36 }
  37
  38 void vlan_gvrp_request_leave(const struct net_device *dev)
  39 {
  40         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  41         __be16 vlan_id = htons(vlan->vlan_id);
  42
  43         if (vlan->vlan_proto != htons(ETH_P_8021Q))
  44                 return;
  45         garp_request_leave(vlan->real_dev, &vlan_gvrp_app,
  46                            &vlan_id, sizeof(vlan_id), GVRP_ATTR_VID);
  47 }
  48
  49 int vlan_gvrp_init_applicant(struct net_device *dev)
  50 {
  51         return garp_init_applicant(dev, &vlan_gvrp_app);
  52 }
  53
  54 void vlan_gvrp_uninit_applicant(struct net_device *dev)
  55 {
  56         garp_uninit_applicant(dev, &vlan_gvrp_app);
  57 }
  58
  59 int __init vlan_gvrp_init(void)
  60 {
  61         return garp_register_application(&vlan_gvrp_app);
  62 }
  63
  64 void vlan_gvrp_uninit(void)
  65 {
  66         garp_unregister_application(&vlan_gvrp_app);
  67 }