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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * net/core/dev_addr_lists.c - Functions for handling net device lists
  * Copyright (c) 2010 Jiri Pirko <jpirko@redhat.com>
  *
  * This file contains functions for working with unicast, multicast and device
  * addresses lists.
  */
 
 #include <linux/netdevice.h>
 #include <linux/rtnetlink.h>
 #include <linux/export.h>
 #include <linux/list.h>
 
 #include "dev.h"
 
 /*
  * General list handling functions
  */
 
 static int __hw_addr_insert(struct netdev_hw_addr_list *list,
                 struct netdev_hw_addr *new, int addr_len)
 {
     struct rb_node **ins_point = &list->tree.rb_node, *parent = NULL;
     struct netdev_hw_addr *ha;
 
     while (*ins_point) {
         int diff;
 
         ha = rb_entry(*ins_point, struct netdev_hw_addr, node);
         diff = memcmp(new->addr, ha->addr, addr_len);
         if (diff == 0)
             diff = memcmp(&new->type, &ha->type, sizeof(new->type));
 
         parent = *ins_point;
         if (diff < 0)
             ins_point = &parent->rb_left;
         else if (diff > 0)
             ins_point = &parent->rb_right;
         else
             return -EEXIST;
     }
 
     rb_link_node_rcu(&new->node, parent, ins_point);
     rb_insert_color(&new->node, &list->tree);
 
     return 0;
 }
 
 static struct netdev_hw_addr*
 __hw_addr_create(const unsigned char *addr, int addr_len,
          unsigned char addr_type, bool global, bool sync)
 {
     struct netdev_hw_addr *ha;
     int alloc_size;
 
     alloc_size = sizeof(*ha);
     if (alloc_size < L1_CACHE_BYTES)
         alloc_size = L1_CACHE_BYTES;
     ha = kmalloc(alloc_size, GFP_ATOMIC);
     if (!ha)
         return NULL;
     memcpy(ha->addr, addr, addr_len);
     ha->type = addr_type;
     ha->refcount = 1;
     ha->global_use = global;
     ha->synced = sync ? 1 : 0;
     ha->sync_cnt = 0;
 
     return ha;
 }
 
 static int __hw_addr_add_ex(struct netdev_hw_addr_list *list,
                 const unsigned char *addr, int addr_len,
                 unsigned char addr_type, bool global, bool sync,
                 int sync_count, bool exclusive)
 {
     struct rb_node **ins_point = &list->tree.rb_node, *parent = NULL;
     struct netdev_hw_addr *ha;
 
     if (addr_len > MAX_ADDR_LEN)
         return -EINVAL;
 
     while (*ins_point) {
         int diff;
 
         ha = rb_entry(*ins_point, struct netdev_hw_addr, node);
         diff = memcmp(addr, ha->addr, addr_len);
         if (diff == 0)
             diff = memcmp(&addr_type, &ha->type, sizeof(addr_type));
 
         parent = *ins_point;
         if (diff < 0) {
             ins_point = &parent->rb_left;
         } else if (diff > 0) {
             ins_point = &parent->rb_right;
         } else {
             if (exclusive)
                 return -EEXIST;
             if (global) {
                 /* check if addr is already used as global */
                 if (ha->global_use)
                     return 0;
                 else
                     ha->global_use = true;
             }
             if (sync) {
                 if (ha->synced && sync_count)
                     return -EEXIST;
                 else
                     ha->synced++;
             }
             ha->refcount++;
             return 0;
         }
     }
 
     ha = __hw_addr_create(addr, addr_len, addr_type, global, sync);
     if (!ha)
         return -ENOMEM;
 
     rb_link_node(&ha->node, parent, ins_point);
     rb_insert_color(&ha->node, &list->tree);
 
     list_add_tail_rcu(&ha->list, &list->list);
     list->count++;
 
     return 0;
 }
 
 static int __hw_addr_add(struct netdev_hw_addr_list *list,
              const unsigned char *addr, int addr_len,
              unsigned char addr_type)
 {
     return __hw_addr_add_ex(list, addr, addr_len, addr_type, false, false,
                 0, false);
 }
 
 static int __hw_addr_del_entry(struct netdev_hw_addr_list *list,
                    struct netdev_hw_addr *ha, bool global,
                    bool sync)
 {
     if (global && !ha->global_use)
         return -ENOENT;
 
     if (sync && !ha->synced)
         return -ENOENT;
 
     if (global)
         ha->global_use = false;
 
     if (sync)
         ha->synced--;
 
     if (--ha->refcount)
         return 0;
 
     rb_erase(&ha->node, &list->tree);
 
     list_del_rcu(&ha->list);
     kfree_rcu(ha, rcu_head);
     list->count--;
     return 0;
 }
 
 static struct netdev_hw_addr *__hw_addr_lookup(struct netdev_hw_addr_list *list,
                            const unsigned char *addr, int addr_len,
                            unsigned char addr_type)
 {
     struct rb_node *node;
 
     node = list->tree.rb_node;
 
     while (node) {
         struct netdev_hw_addr *ha = rb_entry(node, struct netdev_hw_addr, node);
         int diff = memcmp(addr, ha->addr, addr_len);
 
         if (diff == 0 && addr_type)
             diff = memcmp(&addr_type, &ha->type, sizeof(addr_type));
 
         if (diff < 0)
             node = node->rb_left;
         else if (diff > 0)
             node = node->rb_right;
         else
             return ha;
     }
 
     return NULL;
 }
 
 static int __hw_addr_del_ex(struct netdev_hw_addr_list *list,
                 const unsigned char *addr, int addr_len,
                 unsigned char addr_type, bool global, bool sync)
 {
     struct netdev_hw_addr *ha = __hw_addr_lookup(list, addr, addr_len, addr_type);
 
     if (!ha)
         return -ENOENT;
     return __hw_addr_del_entry(list, ha, global, sync);
 }
 
 static int __hw_addr_del(struct netdev_hw_addr_list *list,
              const unsigned char *addr, int addr_len,
              unsigned char addr_type)
 {
     return __hw_addr_del_ex(list, addr, addr_len, addr_type, false, false);
 }
 
 static int __hw_addr_sync_one(struct netdev_hw_addr_list *to_list,
                    struct netdev_hw_addr *ha,
                    int addr_len)
 {
     int err;
 
     err = __hw_addr_add_ex(to_list, ha->addr, addr_len, ha->type,
                    false, true, ha->sync_cnt, false);
     if (err && err != -EEXIST)
         return err;
 
     if (!err) {
         ha->sync_cnt++;
         ha->refcount++;
     }
 
     return 0;
 }
 
 static void __hw_addr_unsync_one(struct netdev_hw_addr_list *to_list,
                  struct netdev_hw_addr_list *from_list,
                  struct netdev_hw_addr *ha,
                  int addr_len)
 {
     int err;
 
     err = __hw_addr_del_ex(to_list, ha->addr, addr_len, ha->type,
                    false, true);
     if (err)
         return;
     ha->sync_cnt--;
     /* address on from list is not marked synced */
     __hw_addr_del_entry(from_list, ha, false, false);
 }
 
 static int __hw_addr_sync_multiple(struct netdev_hw_addr_list *to_list,
                    struct netdev_hw_addr_list *from_list,
                    int addr_len)
 {
     int err = 0;
     struct netdev_hw_addr *ha, *tmp;
 
     list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
         if (ha->sync_cnt == ha->refcount) {
             __hw_addr_unsync_one(to_list, from_list, ha, addr_len);
         } else {
             err = __hw_addr_sync_one(to_list, ha, addr_len);
             if (err)
                 break;
         }
     }
     return err;
 }
 
 /* This function only works where there is a strict 1-1 relationship
  * between source and destionation of they synch. If you ever need to
  * sync addresses to more then 1 destination, you need to use
  * __hw_addr_sync_multiple().
  */
 int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
            struct netdev_hw_addr_list *from_list,
            int addr_len)
 {
     int err = 0;
     struct netdev_hw_addr *ha, *tmp;
 
     list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
         if (!ha->sync_cnt) {
             err = __hw_addr_sync_one(to_list, ha, addr_len);
             if (err)
                 break;
         } else if (ha->refcount == 1)
             __hw_addr_unsync_one(to_list, from_list, ha, addr_len);
     }
     return err;
 }
 EXPORT_SYMBOL(__hw_addr_sync);
 
 void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
               struct netdev_hw_addr_list *from_list,
               int addr_len)
 {
     struct netdev_hw_addr *ha, *tmp;
 
     list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
         if (ha->sync_cnt)
             __hw_addr_unsync_one(to_list, from_list, ha, addr_len);
     }
 }
 EXPORT_SYMBOL(__hw_addr_unsync);
 
 /**
  *  __hw_addr_sync_dev - Synchonize device's multicast list
  *  @list: address list to syncronize
  *  @dev:  device to sync
  *  @sync: function to call if address should be added
  *  @unsync: function to call if address should be removed
  *
  *  This function is intended to be called from the ndo_set_rx_mode
  *  function of devices that require explicit address add/remove
  *  notifications.  The unsync function may be NULL in which case
  *  the addresses requiring removal will simply be removed without
  *  any notification to the device.
  **/
 int __hw_addr_sync_dev(struct netdev_hw_addr_list *list,
                struct net_device *dev,
                int (*sync)(struct net_device *, const unsigned char *),
                int (*unsync)(struct net_device *,
                      const unsigned char *))
 {
     struct netdev_hw_addr *ha, *tmp;
     int err;
 
     /* first go through and flush out any stale entries */
     list_for_each_entry_safe(ha, tmp, &list->list, list) {
         if (!ha->sync_cnt || ha->refcount != 1)
             continue;
 
         /* if unsync is defined and fails defer unsyncing address */
         if (unsync && unsync(dev, ha->addr))
             continue;
 
         ha->sync_cnt--;
         __hw_addr_del_entry(list, ha, false, false);
     }
 
     /* go through and sync new entries to the list */
     list_for_each_entry_safe(ha, tmp, &list->list, list) {
         if (ha->sync_cnt)
             continue;
 
         err = sync(dev, ha->addr);
         if (err)
             return err;
 
         ha->sync_cnt++;
         ha->refcount++;
     }
 
     return 0;
 }
 EXPORT_SYMBOL(__hw_addr_sync_dev);
 
 /**
  *  __hw_addr_ref_sync_dev - Synchronize device's multicast address list taking
  *  into account references
  *  @list: address list to synchronize
  *  @dev:  device to sync
  *  @sync: function to call if address or reference on it should be added
  *  @unsync: function to call if address or some reference on it should removed
  *
  *  This function is intended to be called from the ndo_set_rx_mode
  *  function of devices that require explicit address or references on it
  *  add/remove notifications. The unsync function may be NULL in which case
  *  the addresses or references on it requiring removal will simply be
  *  removed without any notification to the device. That is responsibility of
  *  the driver to identify and distribute address or references on it between
  *  internal address tables.
  **/
 int __hw_addr_ref_sync_dev(struct netdev_hw_addr_list *list,
                struct net_device *dev,
                int (*sync)(struct net_device *,
                        const unsigned char *, int),
                int (*unsync)(struct net_device *,
                      const unsigned char *, int))
 {
     struct netdev_hw_addr *ha, *tmp;
     int err, ref_cnt;
 
     /* first go through and flush out any unsynced/stale entries */
     list_for_each_entry_safe(ha, tmp, &list->list, list) {
         /* sync if address is not used */
         if ((ha->sync_cnt << 1) <= ha->refcount)
             continue;
 
         /* if fails defer unsyncing address */
         ref_cnt = ha->refcount - ha->sync_cnt;
         if (unsync && unsync(dev, ha->addr, ref_cnt))
             continue;
 
         ha->refcount = (ref_cnt << 1) + 1;
         ha->sync_cnt = ref_cnt;
         __hw_addr_del_entry(list, ha, false, false);
     }
 
     /* go through and sync updated/new entries to the list */
     list_for_each_entry_safe(ha, tmp, &list->list, list) {
         /* sync if address added or reused */
         if ((ha->sync_cnt << 1) >= ha->refcount)
             continue;
 
         ref_cnt = ha->refcount - ha->sync_cnt;
         err = sync(dev, ha->addr, ref_cnt);
         if (err)
             return err;
 
         ha->refcount = ref_cnt << 1;
         ha->sync_cnt = ref_cnt;
     }
 
     return 0;
 }
 EXPORT_SYMBOL(__hw_addr_ref_sync_dev);
 
 /**
  *  __hw_addr_ref_unsync_dev - Remove synchronized addresses and references on
  *  it from device
  *  @list: address list to remove synchronized addresses (references on it) from
  *  @dev:  device to sync
  *  @unsync: function to call if address and references on it should be removed
  *
  *  Remove all addresses that were added to the device by
  *  __hw_addr_ref_sync_dev(). This function is intended to be called from the
  *  ndo_stop or ndo_open functions on devices that require explicit address (or
  *  references on it) add/remove notifications. If the unsync function pointer
  *  is NULL then this function can be used to just reset the sync_cnt for the
  *  addresses in the list.
  **/
 void __hw_addr_ref_unsync_dev(struct netdev_hw_addr_list *list,
                   struct net_device *dev,
                   int (*unsync)(struct net_device *,
                         const unsigned char *, int))
 {
     struct netdev_hw_addr *ha, *tmp;
 
     list_for_each_entry_safe(ha, tmp, &list->list, list) {
         if (!ha->sync_cnt)
             continue;
 
         /* if fails defer unsyncing address */
         if (unsync && unsync(dev, ha->addr, ha->sync_cnt))
             continue;
 
         ha->refcount -= ha->sync_cnt - 1;
         ha->sync_cnt = 0;
         __hw_addr_del_entry(list, ha, false, false);
     }
 }
 EXPORT_SYMBOL(__hw_addr_ref_unsync_dev);
 
 /**
  *  __hw_addr_unsync_dev - Remove synchronized addresses from device
  *  @list: address list to remove synchronized addresses from
  *  @dev:  device to sync
  *  @unsync: function to call if address should be removed
  *
  *  Remove all addresses that were added to the device by __hw_addr_sync_dev().
  *  This function is intended to be called from the ndo_stop or ndo_open
  *  functions on devices that require explicit address add/remove
  *  notifications.  If the unsync function pointer is NULL then this function
  *  can be used to just reset the sync_cnt for the addresses in the list.
  **/
 void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list,
               struct net_device *dev,
               int (*unsync)(struct net_device *,
                     const unsigned char *))
 {
     struct netdev_hw_addr *ha, *tmp;
 
     list_for_each_entry_safe(ha, tmp, &list->list, list) {
         if (!ha->sync_cnt)
             continue;
 
         /* if unsync is defined and fails defer unsyncing address */
         if (unsync && unsync(dev, ha->addr))
             continue;
 
         ha->sync_cnt--;
         __hw_addr_del_entry(list, ha, false, false);
     }
 }
 EXPORT_SYMBOL(__hw_addr_unsync_dev);
 
 static void __hw_addr_flush(struct netdev_hw_addr_list *list)
 {
     struct netdev_hw_addr *ha, *tmp;
 
     list->tree = RB_ROOT;
     list_for_each_entry_safe(ha, tmp, &list->list, list) {
         list_del_rcu(&ha->list);
         kfree_rcu(ha, rcu_head);
     }
     list->count = 0;
 }
 
 void __hw_addr_init(struct netdev_hw_addr_list *list)
 {
     INIT_LIST_HEAD(&list->list);
     list->count = 0;
     list->tree = RB_ROOT;
 }
 EXPORT_SYMBOL(__hw_addr_init);
 
 /*
  * Device addresses handling functions
  */
 
 /* Check that netdev->dev_addr is not written to directly as this would
  * break the rbtree layout. All changes should go thru dev_addr_set() and co.
  * Remove this check in mid-2024.
  */
 void dev_addr_check(struct net_device *dev)
 {
     if (!memcmp(dev->dev_addr, dev->dev_addr_shadow, MAX_ADDR_LEN))
         return;
 
     netdev_warn(dev, "Current addr:  %*ph\n", MAX_ADDR_LEN, dev->dev_addr);
     netdev_warn(dev, "Expected addr: %*ph\n",
             MAX_ADDR_LEN, dev->dev_addr_shadow);
     netdev_WARN(dev, "Incorrect netdev->dev_addr\n");
 }
 
 /**
  *  dev_addr_flush - Flush device address list
  *  @dev: device
  *
  *  Flush device address list and reset ->dev_addr.
  *
  *  The caller must hold the rtnl_mutex.
  */
 void dev_addr_flush(struct net_device *dev)
 {
     /* rtnl_mutex must be held here */
     dev_addr_check(dev);
 
     __hw_addr_flush(&dev->dev_addrs);
     dev->dev_addr = NULL;
 }
 
 /**
  *  dev_addr_init - Init device address list
  *  @dev: device
  *
  *  Init device address list and create the first element,
  *  used by ->dev_addr.
  *
  *  The caller must hold the rtnl_mutex.
  */
 int dev_addr_init(struct net_device *dev)
 {
     unsigned char addr[MAX_ADDR_LEN];
     struct netdev_hw_addr *ha;
     int err;
 
     /* rtnl_mutex must be held here */
 
     __hw_addr_init(&dev->dev_addrs);
     memset(addr, 0, sizeof(addr));
     err = __hw_addr_add(&dev->dev_addrs, addr, sizeof(addr),
                 NETDEV_HW_ADDR_T_LAN);
     if (!err) {
         /*
          * Get the first (previously created) address from the list
          * and set dev_addr pointer to this location.
          */
         ha = list_first_entry(&dev->dev_addrs.list,
                       struct netdev_hw_addr, list);
         dev->dev_addr = ha->addr;
     }
     return err;
 }
 
 void dev_addr_mod(struct net_device *dev, unsigned int offset,
           const void *addr, size_t len)
 {
     struct netdev_hw_addr *ha;
 
     dev_addr_check(dev);
 
     ha = container_of(dev->dev_addr, struct netdev_hw_addr, addr[0]);
     rb_erase(&ha->node, &dev->dev_addrs.tree);
     memcpy(&ha->addr[offset], addr, len);
     memcpy(&dev->dev_addr_shadow[offset], addr, len);
     WARN_ON(__hw_addr_insert(&dev->dev_addrs, ha, dev->addr_len));
 }
 EXPORT_SYMBOL(dev_addr_mod);
 
 /**
  *  dev_addr_add - Add a device address
  *  @dev: device
  *  @addr: address to add
  *  @addr_type: address type
  *
  *  Add a device address to the device or increase the reference count if
  *  it already exists.
  *
  *  The caller must hold the rtnl_mutex.
  */
 int dev_addr_add(struct net_device *dev, const unsigned char *addr,
          unsigned char addr_type)
 {
     int err;
 
     ASSERT_RTNL();
 
     err = dev_pre_changeaddr_notify(dev, addr, NULL);
     if (err)
         return err;
     err = __hw_addr_add(&dev->dev_addrs, addr, dev->addr_len, addr_type);
     if (!err)
         call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
     return err;
 }
 EXPORT_SYMBOL(dev_addr_add);
 
 /**
  *  dev_addr_del - Release a device address.
  *  @dev: device
  *  @addr: address to delete
  *  @addr_type: address type
  *
  *  Release reference to a device address and remove it from the device
  *  if the reference count drops to zero.
  *
  *  The caller must hold the rtnl_mutex.
  */
 int dev_addr_del(struct net_device *dev, const unsigned char *addr,
          unsigned char addr_type)
 {
     int err;
     struct netdev_hw_addr *ha;
 
     ASSERT_RTNL();
 
     /*
      * We can not remove the first address from the list because
      * dev->dev_addr points to that.
      */
     ha = list_first_entry(&dev->dev_addrs.list,
                   struct netdev_hw_addr, list);
     if (!memcmp(ha->addr, addr, dev->addr_len) &&
         ha->type == addr_type && ha->refcount == 1)
         return -ENOENT;
 
     err = __hw_addr_del(&dev->dev_addrs, addr, dev->addr_len,
                 addr_type);
     if (!err)
         call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
     return err;
 }
 EXPORT_SYMBOL(dev_addr_del);
 
 /*
  * Unicast list handling functions
  */
 
 /**
  *  dev_uc_add_excl - Add a global secondary unicast address
  *  @dev: device
  *  @addr: address to add
  */
 int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr)
 {
     int err;
 
     netif_addr_lock_bh(dev);
     err = __hw_addr_add_ex(&dev->uc, addr, dev->addr_len,
                    NETDEV_HW_ADDR_T_UNICAST, true, false,
                    0, true);
     if (!err)
         __dev_set_rx_mode(dev);
     netif_addr_unlock_bh(dev);
     return err;
 }
 EXPORT_SYMBOL(dev_uc_add_excl);
 
 /**
  *  dev_uc_add - Add a secondary unicast address
  *  @dev: device
  *  @addr: address to add
  *
  *  Add a secondary unicast address to the device or increase
  *  the reference count if it already exists.
  */
 int dev_uc_add(struct net_device *dev, const unsigned char *addr)
 {
     int err;
 
     netif_addr_lock_bh(dev);
     err = __hw_addr_add(&dev->uc, addr, dev->addr_len,
                 NETDEV_HW_ADDR_T_UNICAST);
     if (!err)
         __dev_set_rx_mode(dev);
     netif_addr_unlock_bh(dev);
     return err;
 }
 EXPORT_SYMBOL(dev_uc_add);
 
 /**
  *  dev_uc_del - Release secondary unicast address.
  *  @dev: device
  *  @addr: address to delete
  *
  *  Release reference to a secondary unicast address and remove it
  *  from the device if the reference count drops to zero.
  */
 int dev_uc_del(struct net_device *dev, const unsigned char *addr)
 {
     int err;
 
     netif_addr_lock_bh(dev);
     err = __hw_addr_del(&dev->uc, addr, dev->addr_len,
                 NETDEV_HW_ADDR_T_UNICAST);
     if (!err)
         __dev_set_rx_mode(dev);
     netif_addr_unlock_bh(dev);
     return err;
 }
 EXPORT_SYMBOL(dev_uc_del);
 
 /**
  *  dev_uc_sync - Synchronize device's unicast list to another device
  *  @to: destination device
  *  @from: source device
  *
  *  Add newly added addresses to the destination device and release
  *  addresses that have no users left. The source device must be
  *  locked by netif_addr_lock_bh.
  *
  *  This function is intended to be called from the dev->set_rx_mode
  *  function of layered software devices.  This function assumes that
  *  addresses will only ever be synced to the @to devices and no other.
  */
 int dev_uc_sync(struct net_device *to, struct net_device *from)
 {
     int err = 0;
 
     if (to->addr_len != from->addr_len)
         return -EINVAL;
 
     netif_addr_lock(to);
     err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len);
     if (!err)
         __dev_set_rx_mode(to);
     netif_addr_unlock(to);
     return err;
 }
 EXPORT_SYMBOL(dev_uc_sync);
 
 /**
  *  dev_uc_sync_multiple - Synchronize device's unicast list to another
  *  device, but allow for multiple calls to sync to multiple devices.
  *  @to: destination device
  *  @from: source device
  *
  *  Add newly added addresses to the destination device and release
  *  addresses that have been deleted from the source. The source device
  *  must be locked by netif_addr_lock_bh.
  *
  *  This function is intended to be called from the dev->set_rx_mode
  *  function of layered software devices.  It allows for a single source
  *  device to be synced to multiple destination devices.
  */
 int dev_uc_sync_multiple(struct net_device *to, struct net_device *from)
 {
     int err = 0;
 
     if (to->addr_len != from->addr_len)
         return -EINVAL;
 
     netif_addr_lock(to);
     err = __hw_addr_sync_multiple(&to->uc, &from->uc, to->addr_len);
     if (!err)
         __dev_set_rx_mode(to);
     netif_addr_unlock(to);
     return err;
 }
 EXPORT_SYMBOL(dev_uc_sync_multiple);
 
 /**
  *  dev_uc_unsync - Remove synchronized addresses from the destination device
  *  @to: destination device
  *  @from: source device
  *
  *  Remove all addresses that were added to the destination device by
  *  dev_uc_sync(). This function is intended to be called from the
  *  dev->stop function of layered software devices.
  */
 void dev_uc_unsync(struct net_device *to, struct net_device *from)
 {
     if (to->addr_len != from->addr_len)
         return;
 
     /* netif_addr_lock_bh() uses lockdep subclass 0, this is okay for two
      * reasons:
      * 1) This is always called without any addr_list_lock, so as the
      *    outermost one here, it must be 0.
      * 2) This is called by some callers after unlinking the upper device,
      *    so the dev->lower_level becomes 1 again.
      * Therefore, the subclass for 'from' is 0, for 'to' is either 1 or
      * larger.
      */
     netif_addr_lock_bh(from);
     netif_addr_lock(to);
     __hw_addr_unsync(&to->uc, &from->uc, to->addr_len);
     __dev_set_rx_mode(to);
     netif_addr_unlock(to);
     netif_addr_unlock_bh(from);
 }
 EXPORT_SYMBOL(dev_uc_unsync);
 
 /**
  *  dev_uc_flush - Flush unicast addresses
  *  @dev: device
  *
  *  Flush unicast addresses.
  */
 void dev_uc_flush(struct net_device *dev)
 {
     netif_addr_lock_bh(dev);
     __hw_addr_flush(&dev->uc);
     netif_addr_unlock_bh(dev);
 }
 EXPORT_SYMBOL(dev_uc_flush);
 
 /**
  *  dev_uc_init - Init unicast address list
  *  @dev: device
  *
  *  Init unicast address list.
  */
 void dev_uc_init(struct net_device *dev)
 {
     __hw_addr_init(&dev->uc);
 }
 EXPORT_SYMBOL(dev_uc_init);
 
 /*
  * Multicast list handling functions
  */
 
 /**
  *  dev_mc_add_excl - Add a global secondary multicast address
  *  @dev: device
  *  @addr: address to add
  */
 int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr)
 {
     int err;
 
     netif_addr_lock_bh(dev);
     err = __hw_addr_add_ex(&dev->mc, addr, dev->addr_len,
                    NETDEV_HW_ADDR_T_MULTICAST, true, false,
                    0, true);
     if (!err)
         __dev_set_rx_mode(dev);
     netif_addr_unlock_bh(dev);
     return err;
 }
 EXPORT_SYMBOL(dev_mc_add_excl);
 
 static int __dev_mc_add(struct net_device *dev, const unsigned char *addr,
             bool global)
 {
     int err;
 
     netif_addr_lock_bh(dev);
     err = __hw_addr_add_ex(&dev->mc, addr, dev->addr_len,
                    NETDEV_HW_ADDR_T_MULTICAST, global, false,
                    0, false);
     if (!err)
         __dev_set_rx_mode(dev);
     netif_addr_unlock_bh(dev);
     return err;
 }
 /**
  *  dev_mc_add - Add a multicast address
  *  @dev: device
  *  @addr: address to add
  *
  *  Add a multicast address to the device or increase
  *  the reference count if it already exists.
  */
 int dev_mc_add(struct net_device *dev, const unsigned char *addr)
 {
     return __dev_mc_add(dev, addr, false);
 }
 EXPORT_SYMBOL(dev_mc_add);
 
 /**
  *  dev_mc_add_global - Add a global multicast address
  *  @dev: device
  *  @addr: address to add
  *
  *  Add a global multicast address to the device.
  */
 int dev_mc_add_global(struct net_device *dev, const unsigned char *addr)
 {
     return __dev_mc_add(dev, addr, true);
 }
 EXPORT_SYMBOL(dev_mc_add_global);
 
 static int __dev_mc_del(struct net_device *dev, const unsigned char *addr,
             bool global)
 {
     int err;
 
     netif_addr_lock_bh(dev);
     err = __hw_addr_del_ex(&dev->mc, addr, dev->addr_len,
                    NETDEV_HW_ADDR_T_MULTICAST, global, false);
     if (!err)
         __dev_set_rx_mode(dev);
     netif_addr_unlock_bh(dev);
     return err;
 }
 
 /**
  *  dev_mc_del - Delete a multicast address.
  *  @dev: device
  *  @addr: address to delete
  *
  *  Release reference to a multicast address and remove it
  *  from the device if the reference count drops to zero.
  */
 int dev_mc_del(struct net_device *dev, const unsigned char *addr)
 {
     return __dev_mc_del(dev, addr, false);
 }
 EXPORT_SYMBOL(dev_mc_del);
 
 /**
  *  dev_mc_del_global - Delete a global multicast address.
  *  @dev: device
  *  @addr: address to delete
  *
  *  Release reference to a multicast address and remove it
  *  from the device if the reference count drops to zero.
  */
 int dev_mc_del_global(struct net_device *dev, const unsigned char *addr)
 {
     return __dev_mc_del(dev, addr, true);
 }
 EXPORT_SYMBOL(dev_mc_del_global);
 
 /**
  *  dev_mc_sync - Synchronize device's multicast list to another device
  *  @to: destination device
  *  @from: source device
  *
  *  Add newly added addresses to the destination device and release
  *  addresses that have no users left. The source device must be
  *  locked by netif_addr_lock_bh.
  *
  *  This function is intended to be called from the ndo_set_rx_mode
  *  function of layered software devices.
  */
 int dev_mc_sync(struct net_device *to, struct net_device *from)
 {
     int err = 0;
 
     if (to->addr_len != from->addr_len)
         return -EINVAL;
 
     netif_addr_lock(to);
     err = __hw_addr_sync(&to->mc, &from->mc, to->addr_len);
     if (!err)
         __dev_set_rx_mode(to);
     netif_addr_unlock(to);
     return err;
 }
 EXPORT_SYMBOL(dev_mc_sync);
 
 /**
  *  dev_mc_sync_multiple - Synchronize device's multicast list to another
  *  device, but allow for multiple calls to sync to multiple devices.
  *  @to: destination device
  *  @from: source device
  *
  *  Add newly added addresses to the destination device and release
  *  addresses that have no users left. The source device must be
  *  locked by netif_addr_lock_bh.
  *
  *  This function is intended to be called from the ndo_set_rx_mode
  *  function of layered software devices.  It allows for a single
  *  source device to be synced to multiple destination devices.
  */
 int dev_mc_sync_multiple(struct net_device *to, struct net_device *from)
 {
     int err = 0;
 
     if (to->addr_len != from->addr_len)
         return -EINVAL;
 
     netif_addr_lock(to);
     err = __hw_addr_sync_multiple(&to->mc, &from->mc, to->addr_len);
     if (!err)
         __dev_set_rx_mode(to);
     netif_addr_unlock(to);
     return err;
 }
 EXPORT_SYMBOL(dev_mc_sync_multiple);
 
 /**
  *  dev_mc_unsync - Remove synchronized addresses from the destination device
  *  @to: destination device
  *  @from: source device
  *
  *  Remove all addresses that were added to the destination device by
  *  dev_mc_sync(). This function is intended to be called from the
  *  dev->stop function of layered software devices.
  */
 void dev_mc_unsync(struct net_device *to, struct net_device *from)
 {
     if (to->addr_len != from->addr_len)
         return;
 
     /* See the above comments inside dev_uc_unsync(). */
     netif_addr_lock_bh(from);
     netif_addr_lock(to);
     __hw_addr_unsync(&to->mc, &from->mc, to->addr_len);
     __dev_set_rx_mode(to);
     netif_addr_unlock(to);
     netif_addr_unlock_bh(from);
 }
 EXPORT_SYMBOL(dev_mc_unsync);
 
 /**
  *  dev_mc_flush - Flush multicast addresses
  *  @dev: device
  *
  *  Flush multicast addresses.
  */
 void dev_mc_flush(struct net_device *dev)
 {
     netif_addr_lock_bh(dev);
     __hw_addr_flush(&dev->mc);
     netif_addr_unlock_bh(dev);
 }
 EXPORT_SYMBOL(dev_mc_flush);
 
 /**
  *  dev_mc_init - Init multicast address list
  *  @dev: device
  *
  *  Init multicast address list.
  */
 void dev_mc_init(struct net_device *dev)
 {
     __hw_addr_init(&dev->mc);
 }
 EXPORT_SYMBOL(dev_mc_init);

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