net/8021q/vlan_mvrp.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *      IEEE 802.1Q Multiple VLAN Registration Protocol (MVRP)
   4  *
   5  *      Copyright (c) 2012 Massachusetts Institute of Technology
   6  *
   7  *      Adapted from code in net/8021q/vlan_gvrp.c
   8  *      Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
   9  */
  10 #include <linux/types.h>
  11 #include <linux/if_ether.h>
  12 #include <linux/if_vlan.h>
  13 #include <net/mrp.h>
  14 #include "vlan.h"
  15
  16 #define MRP_MVRP_ADDRESS        { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x21 }
  17
  18 enum mvrp_attributes {
  19         MVRP_ATTR_INVALID,
  20         MVRP_ATTR_VID,
  21         __MVRP_ATTR_MAX
  22 };
  23 #define MVRP_ATTR_MAX   (__MVRP_ATTR_MAX - 1)
  24
  25 static struct mrp_application vlan_mrp_app __read_mostly = {
  26         .type           = MRP_APPLICATION_MVRP,
  27         .maxattr        = MVRP_ATTR_MAX,
  28         .pkttype.type   = htons(ETH_P_MVRP),
  29         .group_address  = MRP_MVRP_ADDRESS,
  30         .version        = 0,
  31 };
  32
  33 int vlan_mvrp_request_join(const struct net_device *dev)
  34 {
  35         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  36         __be16 vlan_id = htons(vlan->vlan_id);
  37
  38         if (vlan->vlan_proto != htons(ETH_P_8021Q))
  39                 return 0;
  40         return mrp_request_join(vlan->real_dev, &vlan_mrp_app,
  41                                 &vlan_id, sizeof(vlan_id), MVRP_ATTR_VID);
  42 }
  43
  44 void vlan_mvrp_request_leave(const struct net_device *dev)
  45 {
  46         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  47         __be16 vlan_id = htons(vlan->vlan_id);
  48
  49         if (vlan->vlan_proto != htons(ETH_P_8021Q))
  50                 return;
  51         mrp_request_leave(vlan->real_dev, &vlan_mrp_app,
  52                           &vlan_id, sizeof(vlan_id), MVRP_ATTR_VID);
  53 }
  54
  55 int vlan_mvrp_init_applicant(struct net_device *dev)
  56 {
  57         return mrp_init_applicant(dev, &vlan_mrp_app);
  58 }
  59
  60 void vlan_mvrp_uninit_applicant(struct net_device *dev)
  61 {
  62         mrp_uninit_applicant(dev, &vlan_mrp_app);
  63 }
  64
  65 int __init vlan_mvrp_init(void)
  66 {
  67         return mrp_register_application(&vlan_mrp_app);
  68 }
  69
  70 void vlan_mvrp_uninit(void)
  71 {
  72         mrp_unregister_application(&vlan_mrp_app);
  73 }