net/8021q/vlan_gvrp.c

   1 /*
   2  *      IEEE 802.1Q GARP VLAN Registration Protocol (GVRP)
   3  *
   4  *      Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      version 2 as published by the Free Software Foundation.
   9  */
  10 #include <linux/types.h>
  11 #include <linux/if_vlan.h>
  12 #include <net/garp.h>
  13 #include "vlan.h"
  14
  15 #define GARP_GVRP_ADDRESS       { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x21 }
  16
  17 enum gvrp_attributes {
  18         GVRP_ATTR_INVALID,
  19         GVRP_ATTR_VID,
  20         __GVRP_ATTR_MAX
  21 };
  22 #define GVRP_ATTR_MAX   (__GVRP_ATTR_MAX - 1)
  23
  24 static struct garp_application vlan_gvrp_app __read_mostly = {
  25         .proto.group_address    = GARP_GVRP_ADDRESS,
  26         .maxattr                = GVRP_ATTR_MAX,
  27         .type                   = GARP_APPLICATION_GVRP,
  28 };
  29
  30 int vlan_gvrp_request_join(const struct net_device *dev)
  31 {
  32         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  33         __be16 vlan_id = htons(vlan->vlan_id);
  34
  35         if (vlan->vlan_proto != htons(ETH_P_8021Q))
  36                 return 0;
  37         return garp_request_join(vlan->real_dev, &vlan_gvrp_app,
  38                                  &vlan_id, sizeof(vlan_id), GVRP_ATTR_VID);
  39 }
  40
  41 void vlan_gvrp_request_leave(const struct net_device *dev)
  42 {
  43         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  44         __be16 vlan_id = htons(vlan->vlan_id);
  45
  46         if (vlan->vlan_proto != htons(ETH_P_8021Q))
  47                 return;
  48         garp_request_leave(vlan->real_dev, &vlan_gvrp_app,
  49                            &vlan_id, sizeof(vlan_id), GVRP_ATTR_VID);
  50 }
  51
  52 int vlan_gvrp_init_applicant(struct net_device *dev)
  53 {
  54         return garp_init_applicant(dev, &vlan_gvrp_app);
  55 }
  56
  57 void vlan_gvrp_uninit_applicant(struct net_device *dev)
  58 {
  59         garp_uninit_applicant(dev, &vlan_gvrp_app);
  60 }
  61
  62 int __init vlan_gvrp_init(void)
  63 {
  64         return garp_register_application(&vlan_gvrp_app);
  65 }
  66
  67 void vlan_gvrp_uninit(void)
  68 {
  69         garp_unregister_application(&vlan_gvrp_app);
  70 }