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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
 /*
  * INET     An implementation of the TCP/IP protocol suite for the LINUX
  *      operating system.  INET is implemented using the  BSD Socket
  *      interface as the means of communication with the user level.
  *
  *      Routing netlink socket interface: protocol independent part.
  *
  * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  *
  *  Fixes:
  *  Vitaly E. Lavrov        RTA_OK arithmetic was wrong.
  */
 
 #include <linux/bitops.h>
 #include <linux/errno.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/socket.h>
 #include <linux/kernel.h>
 #include <linux/timer.h>
 #include <linux/string.h>
 #include <linux/sockios.h>
 #include <linux/net.h>
 #include <linux/fcntl.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/capability.h>
 #include <linux/skbuff.h>
 #include <linux/init.h>
 #include <linux/security.h>
 #include <linux/mutex.h>
 #include <linux/if_addr.h>
 #include <linux/if_bridge.h>
 #include <linux/if_vlan.h>
 #include <linux/pci.h>
 #include <linux/etherdevice.h>
 #include <linux/bpf.h>
 
 #include <linux/uaccess.h>
 
 #include <linux/inet.h>
 #include <linux/netdevice.h>
 #include <net/ip.h>
 #include <net/protocol.h>
 #include <net/arp.h>
 #include <net/route.h>
 #include <net/udp.h>
 #include <net/tcp.h>
 #include <net/sock.h>
 #include <net/pkt_sched.h>
 #include <net/fib_rules.h>
 #include <net/rtnetlink.h>
 #include <net/net_namespace.h>
 
 #include "dev.h"
 
 #define RTNL_MAX_TYPE       50
 #define RTNL_SLAVE_MAX_TYPE 40
 
 struct rtnl_link {
     rtnl_doit_func      doit;
     rtnl_dumpit_func    dumpit;
     struct module       *owner;
     unsigned int        flags;
     struct rcu_head     rcu;
 };
 
 static DEFINE_MUTEX(rtnl_mutex);
 
 void rtnl_lock(void)
 {
     mutex_lock(&rtnl_mutex);
 }
 EXPORT_SYMBOL(rtnl_lock);
 
 int rtnl_lock_killable(void)
 {
     return mutex_lock_killable(&rtnl_mutex);
 }
 EXPORT_SYMBOL(rtnl_lock_killable);
 
 static struct sk_buff *defer_kfree_skb_list;
 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
 {
     if (head && tail) {
         tail->next = defer_kfree_skb_list;
         defer_kfree_skb_list = head;
     }
 }
 EXPORT_SYMBOL(rtnl_kfree_skbs);
 
 void __rtnl_unlock(void)
 {
     struct sk_buff *head = defer_kfree_skb_list;
 
     defer_kfree_skb_list = NULL;
 
     /* Ensure that we didn't actually add any TODO item when __rtnl_unlock()
      * is used. In some places, e.g. in cfg80211, we have code that will do
      * something like
      *   rtnl_lock()
      *   wiphy_lock()
      *   ...
      *   rtnl_unlock()
      *
      * and because netdev_run_todo() acquires the RTNL for items on the list
      * we could cause a situation such as this:
      * Thread 1         Thread 2
      *                rtnl_lock()
      *                unregister_netdevice()
      *                __rtnl_unlock()
      * rtnl_lock()
      * wiphy_lock()
      * rtnl_unlock()
      *   netdev_run_todo()
      *     __rtnl_unlock()
      *
      *     // list not empty now
      *     // because of thread 2
      *                rtnl_lock()
      *     while (!list_empty(...))
      *       rtnl_lock()
      *                wiphy_lock()
      * **** DEADLOCK ****
      *
      * However, usage of __rtnl_unlock() is rare, and so we can ensure that
      * it's not used in cases where something is added to do the list.
      */
     WARN_ON(!list_empty(&net_todo_list));
 
     mutex_unlock(&rtnl_mutex);
 
     while (head) {
         struct sk_buff *next = head->next;
 
         kfree_skb(head);
         cond_resched();
         head = next;
     }
 }
 
 void rtnl_unlock(void)
 {
     /* This fellow will unlock it for us. */
     netdev_run_todo();
 }
 EXPORT_SYMBOL(rtnl_unlock);
 
 int rtnl_trylock(void)
 {
     return mutex_trylock(&rtnl_mutex);
 }
 EXPORT_SYMBOL(rtnl_trylock);
 
 int rtnl_is_locked(void)
 {
     return mutex_is_locked(&rtnl_mutex);
 }
 EXPORT_SYMBOL(rtnl_is_locked);
 
 bool refcount_dec_and_rtnl_lock(refcount_t *r)
 {
     return refcount_dec_and_mutex_lock(r, &rtnl_mutex);
 }
 EXPORT_SYMBOL(refcount_dec_and_rtnl_lock);
 
 #ifdef CONFIG_PROVE_LOCKING
 bool lockdep_rtnl_is_held(void)
 {
     return lockdep_is_held(&rtnl_mutex);
 }
 EXPORT_SYMBOL(lockdep_rtnl_is_held);
 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 
 static struct rtnl_link __rcu *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 
 static inline int rtm_msgindex(int msgtype)
 {
     int msgindex = msgtype - RTM_BASE;
 
     /*
      * msgindex < 0 implies someone tried to register a netlink
      * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
      * the message type has not been added to linux/rtnetlink.h
      */
     BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 
     return msgindex;
 }
 
 static struct rtnl_link *rtnl_get_link(int protocol, int msgtype)
 {
     struct rtnl_link __rcu **tab;
 
     if (protocol >= ARRAY_SIZE(rtnl_msg_handlers))
         protocol = PF_UNSPEC;
 
     tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]);
     if (!tab)
         tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]);
 
     return rcu_dereference_rtnl(tab[msgtype]);
 }
 
 static int rtnl_register_internal(struct module *owner,
                   int protocol, int msgtype,
                   rtnl_doit_func doit, rtnl_dumpit_func dumpit,
                   unsigned int flags)
 {
     struct rtnl_link *link, *old;
     struct rtnl_link __rcu **tab;
     int msgindex;
     int ret = -ENOBUFS;
 
     BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
     msgindex = rtm_msgindex(msgtype);
 
     rtnl_lock();
     tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
     if (tab == NULL) {
         tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL);
         if (!tab)
             goto unlock;
 
         /* ensures we see the 0 stores */
         rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
     }
 
     old = rtnl_dereference(tab[msgindex]);
     if (old) {
         link = kmemdup(old, sizeof(*old), GFP_KERNEL);
         if (!link)
             goto unlock;
     } else {
         link = kzalloc(sizeof(*link), GFP_KERNEL);
         if (!link)
             goto unlock;
     }
 
     WARN_ON(link->owner && link->owner != owner);
     link->owner = owner;
 
     WARN_ON(doit && link->doit && link->doit != doit);
     if (doit)
         link->doit = doit;
     WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit);
     if (dumpit)
         link->dumpit = dumpit;
 
     WARN_ON(rtnl_msgtype_kind(msgtype) != RTNL_KIND_DEL &&
         (flags & RTNL_FLAG_BULK_DEL_SUPPORTED));
     link->flags |= flags;
 
     /* publish protocol:msgtype */
     rcu_assign_pointer(tab[msgindex], link);
     ret = 0;
     if (old)
         kfree_rcu(old, rcu);
 unlock:
     rtnl_unlock();
     return ret;
 }
 
 /**
  * rtnl_register_module - Register a rtnetlink message type
  *
  * @owner: module registering the hook (THIS_MODULE)
  * @protocol: Protocol family or PF_UNSPEC
  * @msgtype: rtnetlink message type
  * @doit: Function pointer called for each request message
  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
  * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
  *
  * Like rtnl_register, but for use by removable modules.
  */
 int rtnl_register_module(struct module *owner,
              int protocol, int msgtype,
              rtnl_doit_func doit, rtnl_dumpit_func dumpit,
              unsigned int flags)
 {
     return rtnl_register_internal(owner, protocol, msgtype,
                       doit, dumpit, flags);
 }
 EXPORT_SYMBOL_GPL(rtnl_register_module);
 
 /**
  * rtnl_register - Register a rtnetlink message type
  * @protocol: Protocol family or PF_UNSPEC
  * @msgtype: rtnetlink message type
  * @doit: Function pointer called for each request message
  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
  * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
  *
  * Registers the specified function pointers (at least one of them has
  * to be non-NULL) to be called whenever a request message for the
  * specified protocol family and message type is received.
  *
  * The special protocol family PF_UNSPEC may be used to define fallback
  * function pointers for the case when no entry for the specific protocol
  * family exists.
  */
 void rtnl_register(int protocol, int msgtype,
            rtnl_doit_func doit, rtnl_dumpit_func dumpit,
            unsigned int flags)
 {
     int err;
 
     err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit,
                      flags);
     if (err)
         pr_err("Unable to register rtnetlink message handler, "
                "protocol = %d, message type = %d\n", protocol, msgtype);
 }
 
 /**
  * rtnl_unregister - Unregister a rtnetlink message type
  * @protocol: Protocol family or PF_UNSPEC
  * @msgtype: rtnetlink message type
  *
  * Returns 0 on success or a negative error code.
  */
 int rtnl_unregister(int protocol, int msgtype)
 {
     struct rtnl_link __rcu **tab;
     struct rtnl_link *link;
     int msgindex;
 
     BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
     msgindex = rtm_msgindex(msgtype);
 
     rtnl_lock();
     tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
     if (!tab) {
         rtnl_unlock();
         return -ENOENT;
     }
 
     link = rtnl_dereference(tab[msgindex]);
     RCU_INIT_POINTER(tab[msgindex], NULL);
     rtnl_unlock();
 
     kfree_rcu(link, rcu);
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(rtnl_unregister);
 
 /**
  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
  * @protocol : Protocol family or PF_UNSPEC
  *
  * Identical to calling rtnl_unregster() for all registered message types
  * of a certain protocol family.
  */
 void rtnl_unregister_all(int protocol)
 {
     struct rtnl_link __rcu **tab;
     struct rtnl_link *link;
     int msgindex;
 
     BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 
     rtnl_lock();
     tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
     if (!tab) {
         rtnl_unlock();
         return;
     }
     RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
     for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
         link = rtnl_dereference(tab[msgindex]);
         if (!link)
             continue;
 
         RCU_INIT_POINTER(tab[msgindex], NULL);
         kfree_rcu(link, rcu);
     }
     rtnl_unlock();
 
     synchronize_net();
 
     kfree(tab);
 }
 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 
 static LIST_HEAD(link_ops);
 
 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 {
     const struct rtnl_link_ops *ops;
 
     list_for_each_entry(ops, &link_ops, list) {
         if (!strcmp(ops->kind, kind))
             return ops;
     }
     return NULL;
 }
 
 /**
  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
  * @ops: struct rtnl_link_ops * to register
  *
  * The caller must hold the rtnl_mutex. This function should be used
  * by drivers that create devices during module initialization. It
  * must be called before registering the devices.
  *
  * Returns 0 on success or a negative error code.
  */
 int __rtnl_link_register(struct rtnl_link_ops *ops)
 {
     if (rtnl_link_ops_get(ops->kind))
         return -EEXIST;
 
     /* The check for alloc/setup is here because if ops
      * does not have that filled up, it is not possible
      * to use the ops for creating device. So do not
      * fill up dellink as well. That disables rtnl_dellink.
      */
     if ((ops->alloc || ops->setup) && !ops->dellink)
         ops->dellink = unregister_netdevice_queue;
 
     list_add_tail(&ops->list, &link_ops);
     return 0;
 }
 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 
 /**
  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
  * @ops: struct rtnl_link_ops * to register
  *
  * Returns 0 on success or a negative error code.
  */
 int rtnl_link_register(struct rtnl_link_ops *ops)
 {
     int err;
 
     /* Sanity-check max sizes to avoid stack buffer overflow. */
     if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE ||
             ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE))
         return -EINVAL;
 
     rtnl_lock();
     err = __rtnl_link_register(ops);
     rtnl_unlock();
     return err;
 }
 EXPORT_SYMBOL_GPL(rtnl_link_register);
 
 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 {
     struct net_device *dev;
     LIST_HEAD(list_kill);
 
     for_each_netdev(net, dev) {
         if (dev->rtnl_link_ops == ops)
             ops->dellink(dev, &list_kill);
     }
     unregister_netdevice_many(&list_kill);
 }
 
 /**
  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
  * @ops: struct rtnl_link_ops * to unregister
  *
  * The caller must hold the rtnl_mutex and guarantee net_namespace_list
  * integrity (hold pernet_ops_rwsem for writing to close the race
  * with setup_net() and cleanup_net()).
  */
 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 {
     struct net *net;
 
     for_each_net(net) {
         __rtnl_kill_links(net, ops);
     }
     list_del(&ops->list);
 }
 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 
 /* Return with the rtnl_lock held when there are no network
  * devices unregistering in any network namespace.
  */
 static void rtnl_lock_unregistering_all(void)
 {
     struct net *net;
     bool unregistering;
     DEFINE_WAIT_FUNC(wait, woken_wake_function);
 
     add_wait_queue(&netdev_unregistering_wq, &wait);
     for (;;) {
         unregistering = false;
         rtnl_lock();
         /* We held write locked pernet_ops_rwsem, and parallel
          * setup_net() and cleanup_net() are not possible.
          */
         for_each_net(net) {
             if (atomic_read(&net->dev_unreg_count) > 0) {
                 unregistering = true;
                 break;
             }
         }
         if (!unregistering)
             break;
         __rtnl_unlock();
 
         wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
     }
     remove_wait_queue(&netdev_unregistering_wq, &wait);
 }
 
 /**
  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
  * @ops: struct rtnl_link_ops * to unregister
  */
 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 {
     /* Close the race with setup_net() and cleanup_net() */
     down_write(&pernet_ops_rwsem);
     rtnl_lock_unregistering_all();
     __rtnl_link_unregister(ops);
     rtnl_unlock();
     up_write(&pernet_ops_rwsem);
 }
 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 
 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 {
     struct net_device *master_dev;
     const struct rtnl_link_ops *ops;
     size_t size = 0;
 
     rcu_read_lock();
 
     master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
     if (!master_dev)
         goto out;
 
     ops = master_dev->rtnl_link_ops;
     if (!ops || !ops->get_slave_size)
         goto out;
     /* IFLA_INFO_SLAVE_DATA + nested data */
     size = nla_total_size(sizeof(struct nlattr)) +
            ops->get_slave_size(master_dev, dev);
 
 out:
     rcu_read_unlock();
     return size;
 }
 
 static size_t rtnl_link_get_size(const struct net_device *dev)
 {
     const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
     size_t size;
 
     if (!ops)
         return 0;
 
     size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
            nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 
     if (ops->get_size)
         /* IFLA_INFO_DATA + nested data */
         size += nla_total_size(sizeof(struct nlattr)) +
             ops->get_size(dev);
 
     if (ops->get_xstats_size)
         /* IFLA_INFO_XSTATS */
         size += nla_total_size(ops->get_xstats_size(dev));
 
     size += rtnl_link_get_slave_info_data_size(dev);
 
     return size;
 }
 
 static LIST_HEAD(rtnl_af_ops);
 
 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 {
     const struct rtnl_af_ops *ops;
 
     ASSERT_RTNL();
 
     list_for_each_entry(ops, &rtnl_af_ops, list) {
         if (ops->family == family)
             return ops;
     }
 
     return NULL;
 }
 
 /**
  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
  * @ops: struct rtnl_af_ops * to register
  *
  * Returns 0 on success or a negative error code.
  */
 void rtnl_af_register(struct rtnl_af_ops *ops)
 {
     rtnl_lock();
     list_add_tail_rcu(&ops->list, &rtnl_af_ops);
     rtnl_unlock();
 }
 EXPORT_SYMBOL_GPL(rtnl_af_register);
 
 /**
  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
  * @ops: struct rtnl_af_ops * to unregister
  */
 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 {
     rtnl_lock();
     list_del_rcu(&ops->list);
     rtnl_unlock();
 
     synchronize_rcu();
 }
 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 
 static size_t rtnl_link_get_af_size(const struct net_device *dev,
                     u32 ext_filter_mask)
 {
     struct rtnl_af_ops *af_ops;
     size_t size;
 
     /* IFLA_AF_SPEC */
     size = nla_total_size(sizeof(struct nlattr));
 
     rcu_read_lock();
     list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
         if (af_ops->get_link_af_size) {
             /* AF_* + nested data */
             size += nla_total_size(sizeof(struct nlattr)) +
                 af_ops->get_link_af_size(dev, ext_filter_mask);
         }
     }
     rcu_read_unlock();
 
     return size;
 }
 
 static bool rtnl_have_link_slave_info(const struct net_device *dev)
 {
     struct net_device *master_dev;
     bool ret = false;
 
     rcu_read_lock();
 
     master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
     if (master_dev && master_dev->rtnl_link_ops)
         ret = true;
     rcu_read_unlock();
     return ret;
 }
 
 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
                      const struct net_device *dev)
 {
     struct net_device *master_dev;
     const struct rtnl_link_ops *ops;
     struct nlattr *slave_data;
     int err;
 
     master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
     if (!master_dev)
         return 0;
     ops = master_dev->rtnl_link_ops;
     if (!ops)
         return 0;
     if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
         return -EMSGSIZE;
     if (ops->fill_slave_info) {
         slave_data = nla_nest_start_noflag(skb, IFLA_INFO_SLAVE_DATA);
         if (!slave_data)
             return -EMSGSIZE;
         err = ops->fill_slave_info(skb, master_dev, dev);
         if (err < 0)
             goto err_cancel_slave_data;
         nla_nest_end(skb, slave_data);
     }
     return 0;
 
 err_cancel_slave_data:
     nla_nest_cancel(skb, slave_data);
     return err;
 }
 
 static int rtnl_link_info_fill(struct sk_buff *skb,
                    const struct net_device *dev)
 {
     const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
     struct nlattr *data;
     int err;
 
     if (!ops)
         return 0;
     if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
         return -EMSGSIZE;
     if (ops->fill_xstats) {
         err = ops->fill_xstats(skb, dev);
         if (err < 0)
             return err;
     }
     if (ops->fill_info) {
         data = nla_nest_start_noflag(skb, IFLA_INFO_DATA);
         if (data == NULL)
             return -EMSGSIZE;
         err = ops->fill_info(skb, dev);
         if (err < 0)
             goto err_cancel_data;
         nla_nest_end(skb, data);
     }
     return 0;
 
 err_cancel_data:
     nla_nest_cancel(skb, data);
     return err;
 }
 
 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 {
     struct nlattr *linkinfo;
     int err = -EMSGSIZE;
 
     linkinfo = nla_nest_start_noflag(skb, IFLA_LINKINFO);
     if (linkinfo == NULL)
         goto out;
 
     err = rtnl_link_info_fill(skb, dev);
     if (err < 0)
         goto err_cancel_link;
 
     err = rtnl_link_slave_info_fill(skb, dev);
     if (err < 0)
         goto err_cancel_link;
 
     nla_nest_end(skb, linkinfo);
     return 0;
 
 err_cancel_link:
     nla_nest_cancel(skb, linkinfo);
 out:
     return err;
 }
 
 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 {
     struct sock *rtnl = net->rtnl;
 
     return nlmsg_notify(rtnl, skb, pid, group, echo, GFP_KERNEL);
 }
 
 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 {
     struct sock *rtnl = net->rtnl;
 
     return nlmsg_unicast(rtnl, skb, pid);
 }
 EXPORT_SYMBOL(rtnl_unicast);
 
 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
          struct nlmsghdr *nlh, gfp_t flags)
 {
     struct sock *rtnl = net->rtnl;
 
     nlmsg_notify(rtnl, skb, pid, group, nlmsg_report(nlh), flags);
 }
 EXPORT_SYMBOL(rtnl_notify);
 
 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 {
     struct sock *rtnl = net->rtnl;
 
     netlink_set_err(rtnl, 0, group, error);
 }
 EXPORT_SYMBOL(rtnl_set_sk_err);
 
 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 {
     struct nlattr *mx;
     int i, valid = 0;
 
     /* nothing is dumped for dst_default_metrics, so just skip the loop */
     if (metrics == dst_default_metrics.metrics)
         return 0;
 
     mx = nla_nest_start_noflag(skb, RTA_METRICS);
     if (mx == NULL)
         return -ENOBUFS;
 
     for (i = 0; i < RTAX_MAX; i++) {
         if (metrics[i]) {
             if (i == RTAX_CC_ALGO - 1) {
                 char tmp[TCP_CA_NAME_MAX], *name;
 
                 name = tcp_ca_get_name_by_key(metrics[i], tmp);
                 if (!name)
                     continue;
                 if (nla_put_string(skb, i + 1, name))
                     goto nla_put_failure;
             } else if (i == RTAX_FEATURES - 1) {
                 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
 
                 if (!user_features)
                     continue;
                 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
                 if (nla_put_u32(skb, i + 1, user_features))
                     goto nla_put_failure;
             } else {
                 if (nla_put_u32(skb, i + 1, metrics[i]))
                     goto nla_put_failure;
             }
             valid++;
         }
     }
 
     if (!valid) {
         nla_nest_cancel(skb, mx);
         return 0;
     }
 
     return nla_nest_end(skb, mx);
 
 nla_put_failure:
     nla_nest_cancel(skb, mx);
     return -EMSGSIZE;
 }
 EXPORT_SYMBOL(rtnetlink_put_metrics);
 
 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
                long expires, u32 error)
 {
     struct rta_cacheinfo ci = {
         .rta_error = error,
         .rta_id =  id,
     };
 
     if (dst) {
         ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse);
         ci.rta_used = dst->__use;
         ci.rta_clntref = atomic_read(&dst->__refcnt);
     }
     if (expires) {
         unsigned long clock;
 
         clock = jiffies_to_clock_t(abs(expires));
         clock = min_t(unsigned long, clock, INT_MAX);
         ci.rta_expires = (expires > 0) ? clock : -clock;
     }
     return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 }
 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 
 static void set_operstate(struct net_device *dev, unsigned char transition)
 {
     unsigned char operstate = dev->operstate;
 
     switch (transition) {
     case IF_OPER_UP:
         if ((operstate == IF_OPER_DORMANT ||
              operstate == IF_OPER_TESTING ||
              operstate == IF_OPER_UNKNOWN) &&
             !netif_dormant(dev) && !netif_testing(dev))
             operstate = IF_OPER_UP;
         break;
 
     case IF_OPER_TESTING:
         if (operstate == IF_OPER_UP ||
             operstate == IF_OPER_UNKNOWN)
             operstate = IF_OPER_TESTING;
         break;
 
     case IF_OPER_DORMANT:
         if (operstate == IF_OPER_UP ||
             operstate == IF_OPER_UNKNOWN)
             operstate = IF_OPER_DORMANT;
         break;
     }
 
     if (dev->operstate != operstate) {
         write_lock(&dev_base_lock);
         dev->operstate = operstate;
         write_unlock(&dev_base_lock);
         netdev_state_change(dev);
     }
 }
 
 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 {
     return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
            (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 }
 
 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
                        const struct ifinfomsg *ifm)
 {
     unsigned int flags = ifm->ifi_flags;
 
     /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
     if (ifm->ifi_change)
         flags = (flags & ifm->ifi_change) |
             (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 
     return flags;
 }
 
 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
                  const struct rtnl_link_stats64 *b)
 {
     a->rx_packets = b->rx_packets;
     a->tx_packets = b->tx_packets;
     a->rx_bytes = b->rx_bytes;
     a->tx_bytes = b->tx_bytes;
     a->rx_errors = b->rx_errors;
     a->tx_errors = b->tx_errors;
     a->rx_dropped = b->rx_dropped;
     a->tx_dropped = b->tx_dropped;
 
     a->multicast = b->multicast;
     a->collisions = b->collisions;
 
     a->rx_length_errors = b->rx_length_errors;
     a->rx_over_errors = b->rx_over_errors;
     a->rx_crc_errors = b->rx_crc_errors;
     a->rx_frame_errors = b->rx_frame_errors;
     a->rx_fifo_errors = b->rx_fifo_errors;
     a->rx_missed_errors = b->rx_missed_errors;
 
     a->tx_aborted_errors = b->tx_aborted_errors;
     a->tx_carrier_errors = b->tx_carrier_errors;
     a->tx_fifo_errors = b->tx_fifo_errors;
     a->tx_heartbeat_errors = b->tx_heartbeat_errors;
     a->tx_window_errors = b->tx_window_errors;
 
     a->rx_compressed = b->rx_compressed;
     a->tx_compressed = b->tx_compressed;
 
     a->rx_nohandler = b->rx_nohandler;
 }
 
 /* All VF info */
 static inline int rtnl_vfinfo_size(const struct net_device *dev,
                    u32 ext_filter_mask)
 {
     if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
         int num_vfs = dev_num_vf(dev->dev.parent);
         size_t size = nla_total_size(0);
         size += num_vfs *
             (nla_total_size(0) +
              nla_total_size(sizeof(struct ifla_vf_mac)) +
              nla_total_size(sizeof(struct ifla_vf_broadcast)) +
              nla_total_size(sizeof(struct ifla_vf_vlan)) +
              nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
              nla_total_size(MAX_VLAN_LIST_LEN *
                     sizeof(struct ifla_vf_vlan_info)) +
              nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
              nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
              nla_total_size(sizeof(struct ifla_vf_rate)) +
              nla_total_size(sizeof(struct ifla_vf_link_state)) +
              nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
              nla_total_size(0) + /* nest IFLA_VF_STATS */
              /* IFLA_VF_STATS_RX_PACKETS */
              nla_total_size_64bit(sizeof(__u64)) +
              /* IFLA_VF_STATS_TX_PACKETS */
              nla_total_size_64bit(sizeof(__u64)) +
              /* IFLA_VF_STATS_RX_BYTES */
              nla_total_size_64bit(sizeof(__u64)) +
              /* IFLA_VF_STATS_TX_BYTES */
              nla_total_size_64bit(sizeof(__u64)) +
              /* IFLA_VF_STATS_BROADCAST */
              nla_total_size_64bit(sizeof(__u64)) +
              /* IFLA_VF_STATS_MULTICAST */
              nla_total_size_64bit(sizeof(__u64)) +
              /* IFLA_VF_STATS_RX_DROPPED */
              nla_total_size_64bit(sizeof(__u64)) +
              /* IFLA_VF_STATS_TX_DROPPED */
              nla_total_size_64bit(sizeof(__u64)) +
              nla_total_size(sizeof(struct ifla_vf_trust)));
         return size;
     } else
         return 0;
 }
 
 static size_t rtnl_port_size(const struct net_device *dev,
                  u32 ext_filter_mask)
 {
     size_t port_size = nla_total_size(4)        /* PORT_VF */
         + nla_total_size(PORT_PROFILE_MAX)  /* PORT_PROFILE */
         + nla_total_size(PORT_UUID_MAX)     /* PORT_INSTANCE_UUID */
         + nla_total_size(PORT_UUID_MAX)     /* PORT_HOST_UUID */
         + nla_total_size(1)         /* PROT_VDP_REQUEST */
         + nla_total_size(2);            /* PORT_VDP_RESPONSE */
     size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
     size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
         + port_size;
     size_t port_self_size = nla_total_size(sizeof(struct nlattr))
         + port_size;
 
     if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
         !(ext_filter_mask & RTEXT_FILTER_VF))
         return 0;
     if (dev_num_vf(dev->dev.parent))
         return port_self_size + vf_ports_size +
             vf_port_size * dev_num_vf(dev->dev.parent);
     else
         return port_self_size;
 }
 
 static size_t rtnl_xdp_size(void)
 {
     size_t xdp_size = nla_total_size(0) +   /* nest IFLA_XDP */
               nla_total_size(1) +   /* XDP_ATTACHED */
               nla_total_size(4) +   /* XDP_PROG_ID (or 1st mode) */
               nla_total_size(4);    /* XDP_<mode>_PROG_ID */
 
     return xdp_size;
 }
 
 static size_t rtnl_prop_list_size(const struct net_device *dev)
 {
     struct netdev_name_node *name_node;
     size_t size;
 
     if (list_empty(&dev->name_node->list))
         return 0;
     size = nla_total_size(0);
     list_for_each_entry(name_node, &dev->name_node->list, list)
         size += nla_total_size(ALTIFNAMSIZ);
     return size;
 }
 
 static size_t rtnl_proto_down_size(const struct net_device *dev)
 {
     size_t size = nla_total_size(1);
 
     if (dev->proto_down_reason)
         size += nla_total_size(0) + nla_total_size(4);
 
     return size;
 }
 
 static noinline size_t if_nlmsg_size(const struct net_device *dev,
                      u32 ext_filter_mask)
 {
     return NLMSG_ALIGN(sizeof(struct ifinfomsg))
            + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
            + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
            + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
            + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
            + nla_total_size(sizeof(struct rtnl_link_stats))
            + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
            + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
            + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
            + nla_total_size(4) /* IFLA_TXQLEN */
            + nla_total_size(4) /* IFLA_WEIGHT */
            + nla_total_size(4) /* IFLA_MTU */
            + nla_total_size(4) /* IFLA_LINK */
            + nla_total_size(4) /* IFLA_MASTER */
            + nla_total_size(1) /* IFLA_CARRIER */
            + nla_total_size(4) /* IFLA_PROMISCUITY */
            + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
            + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
            + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
            + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
            + nla_total_size(4) /* IFLA_GRO_MAX_SIZE */
            + nla_total_size(4) /* IFLA_TSO_MAX_SIZE */
            + nla_total_size(4) /* IFLA_TSO_MAX_SEGS */
            + nla_total_size(1) /* IFLA_OPERSTATE */
            + nla_total_size(1) /* IFLA_LINKMODE */
            + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
            + nla_total_size(4) /* IFLA_LINK_NETNSID */
            + nla_total_size(4) /* IFLA_GROUP */
            + nla_total_size(ext_filter_mask
                     & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
            + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
            + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
            + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
            + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
            + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
            + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
            + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
            + rtnl_xdp_size() /* IFLA_XDP */
            + nla_total_size(4)  /* IFLA_EVENT */
            + nla_total_size(4)  /* IFLA_NEW_NETNSID */
            + nla_total_size(4)  /* IFLA_NEW_IFINDEX */
            + rtnl_proto_down_size(dev)  /* proto down */
            + nla_total_size(4)  /* IFLA_TARGET_NETNSID */
            + nla_total_size(4)  /* IFLA_CARRIER_UP_COUNT */
            + nla_total_size(4)  /* IFLA_CARRIER_DOWN_COUNT */
            + nla_total_size(4)  /* IFLA_MIN_MTU */
            + nla_total_size(4)  /* IFLA_MAX_MTU */
            + rtnl_prop_list_size(dev)
            + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */
            + 0;
 }
 
 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 {
     struct nlattr *vf_ports;
     struct nlattr *vf_port;
     int vf;
     int err;
 
     vf_ports = nla_nest_start_noflag(skb, IFLA_VF_PORTS);
     if (!vf_ports)
         return -EMSGSIZE;
 
     for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
         vf_port = nla_nest_start_noflag(skb, IFLA_VF_PORT);
         if (!vf_port)
             goto nla_put_failure;
         if (nla_put_u32(skb, IFLA_PORT_VF, vf))
             goto nla_put_failure;
         err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
         if (err == -EMSGSIZE)
             goto nla_put_failure;
         if (err) {
             nla_nest_cancel(skb, vf_port);
             continue;
         }
         nla_nest_end(skb, vf_port);
     }
 
     nla_nest_end(skb, vf_ports);
 
     return 0;
 
 nla_put_failure:
     nla_nest_cancel(skb, vf_ports);
     return -EMSGSIZE;
 }
 
 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 {
     struct nlattr *port_self;
     int err;
 
     port_self = nla_nest_start_noflag(skb, IFLA_PORT_SELF);
     if (!port_self)
         return -EMSGSIZE;
 
     err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
     if (err) {
         nla_nest_cancel(skb, port_self);
         return (err == -EMSGSIZE) ? err : 0;
     }
 
     nla_nest_end(skb, port_self);
 
     return 0;
 }
 
 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
               u32 ext_filter_mask)
 {
     int err;
 
     if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
         !(ext_filter_mask & RTEXT_FILTER_VF))
         return 0;
 
     err = rtnl_port_self_fill(skb, dev);
     if (err)
         return err;
 
     if (dev_num_vf(dev->dev.parent)) {
         err = rtnl_vf_ports_fill(skb, dev);
         if (err)
             return err;
     }
 
     return 0;
 }
 
 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
 {
     int err;
     struct netdev_phys_item_id ppid;
 
     err = dev_get_phys_port_id(dev, &ppid);
     if (err) {
         if (err == -EOPNOTSUPP)
             return 0;
         return err;
     }
 
     if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
         return -EMSGSIZE;
 
     return 0;
 }
 
 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
 {
     char name[IFNAMSIZ];
     int err;
 
     err = dev_get_phys_port_name(dev, name, sizeof(name));
     if (err) {
         if (err == -EOPNOTSUPP)
             return 0;
         return err;
     }
 
     if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
         return -EMSGSIZE;
 
     return 0;
 }
 
 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
 {
     struct netdev_phys_item_id ppid = { };
     int err;
 
     err = dev_get_port_parent_id(dev, &ppid, false);
     if (err) {
         if (err == -EOPNOTSUPP)
             return 0;
         return err;
     }
 
     if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id))
         return -EMSGSIZE;
 
     return 0;
 }
 
 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
                           struct net_device *dev)
 {
     struct rtnl_link_stats64 *sp;
     struct nlattr *attr;
 
     attr = nla_reserve_64bit(skb, IFLA_STATS64,
                  sizeof(struct rtnl_link_stats64), IFLA_PAD);
     if (!attr)
         return -EMSGSIZE;
 
     sp = nla_data(attr);
     dev_get_stats(dev, sp);
 
     attr = nla_reserve(skb, IFLA_STATS,
                sizeof(struct rtnl_link_stats));
     if (!attr)
         return -EMSGSIZE;
 
     copy_rtnl_link_stats(nla_data(attr), sp);
 
     return 0;
 }
 
 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
                            struct net_device *dev,
                            int vfs_num,
                            struct nlattr *vfinfo)
 {
     struct ifla_vf_rss_query_en vf_rss_query_en;
     struct nlattr *vf, *vfstats, *vfvlanlist;
     struct ifla_vf_link_state vf_linkstate;
     struct ifla_vf_vlan_info vf_vlan_info;
     struct ifla_vf_spoofchk vf_spoofchk;
     struct ifla_vf_tx_rate vf_tx_rate;
     struct ifla_vf_stats vf_stats;
     struct ifla_vf_trust vf_trust;
     struct ifla_vf_vlan vf_vlan;
     struct ifla_vf_rate vf_rate;
     struct ifla_vf_mac vf_mac;
     struct ifla_vf_broadcast vf_broadcast;
     struct ifla_vf_info ivi;
     struct ifla_vf_guid node_guid;
     struct ifla_vf_guid port_guid;
 
     memset(&ivi, 0, sizeof(ivi));
 
     /* Not all SR-IOV capable drivers support the
      * spoofcheck and "RSS query enable" query.  Preset to
      * -1 so the user space tool can detect that the driver
      * didn't report anything.
      */
     ivi.spoofchk = -1;
     ivi.rss_query_en = -1;
     ivi.trusted = -1;
     /* The default value for VF link state is "auto"
      * IFLA_VF_LINK_STATE_AUTO which equals zero
      */
     ivi.linkstate = 0;
     /* VLAN Protocol by default is 802.1Q */
     ivi.vlan_proto = htons(ETH_P_8021Q);
     if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
         return 0;
 
     memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
     memset(&node_guid, 0, sizeof(node_guid));
     memset(&port_guid, 0, sizeof(port_guid));
 
     vf_mac.vf =
         vf_vlan.vf =
         vf_vlan_info.vf =
         vf_rate.vf =
         vf_tx_rate.vf =
         vf_spoofchk.vf =
         vf_linkstate.vf =
         vf_rss_query_en.vf =
         vf_trust.vf =
         node_guid.vf =
         port_guid.vf = ivi.vf;
 
     memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
     memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len);
     vf_vlan.vlan = ivi.vlan;
     vf_vlan.qos = ivi.qos;
     vf_vlan_info.vlan = ivi.vlan;
     vf_vlan_info.qos = ivi.qos;
     vf_vlan_info.vlan_proto = ivi.vlan_proto;
     vf_tx_rate.rate = ivi.max_tx_rate;
     vf_rate.min_tx_rate = ivi.min_tx_rate;
     vf_rate.max_tx_rate = ivi.max_tx_rate;
     vf_spoofchk.setting = ivi.spoofchk;
     vf_linkstate.link_state = ivi.linkstate;
     vf_rss_query_en.setting = ivi.rss_query_en;
     vf_trust.setting = ivi.trusted;
     vf = nla_nest_start_noflag(skb, IFLA_VF_INFO);
     if (!vf)
         goto nla_put_vfinfo_failure;
     if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
         nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) ||
         nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
         nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
             &vf_rate) ||
         nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
             &vf_tx_rate) ||
         nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
             &vf_spoofchk) ||
         nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
             &vf_linkstate) ||
         nla_put(skb, IFLA_VF_RSS_QUERY_EN,
             sizeof(vf_rss_query_en),
             &vf_rss_query_en) ||
         nla_put(skb, IFLA_VF_TRUST,
             sizeof(vf_trust), &vf_trust))
         goto nla_put_vf_failure;
 
     if (dev->netdev_ops->ndo_get_vf_guid &&
         !dev->netdev_ops->ndo_get_vf_guid(dev, vfs_num, &node_guid,
                           &port_guid)) {
         if (nla_put(skb, IFLA_VF_IB_NODE_GUID, sizeof(node_guid),
                 &node_guid) ||
             nla_put(skb, IFLA_VF_IB_PORT_GUID, sizeof(port_guid),
                 &port_guid))
             goto nla_put_vf_failure;
     }
     vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST);
     if (!vfvlanlist)
         goto nla_put_vf_failure;
     if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
             &vf_vlan_info)) {
         nla_nest_cancel(skb, vfvlanlist);
         goto nla_put_vf_failure;
     }
     nla_nest_end(skb, vfvlanlist);
     memset(&vf_stats, 0, sizeof(vf_stats));
     if (dev->netdev_ops->ndo_get_vf_stats)
         dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
                         &vf_stats);
     vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS);
     if (!vfstats)
         goto nla_put_vf_failure;
     if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
                   vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
         nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
                   vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
         nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
                   vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
         nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
                   vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
         nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
                   vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
         nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
                   vf_stats.multicast, IFLA_VF_STATS_PAD) ||
         nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
                   vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
         nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
                   vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
         nla_nest_cancel(skb, vfstats);
         goto nla_put_vf_failure;
     }
     nla_nest_end(skb, vfstats);
     nla_nest_end(skb, vf);
     return 0;
 
 nla_put_vf_failure:
     nla_nest_cancel(skb, vf);
 nla_put_vfinfo_failure:
     nla_nest_cancel(skb, vfinfo);
     return -EMSGSIZE;
 }
 
 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
                        struct net_device *dev,
                        u32 ext_filter_mask)
 {
     struct nlattr *vfinfo;
     int i, num_vfs;
 
     if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
         return 0;
 
     num_vfs = dev_num_vf(dev->dev.parent);
     if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
         return -EMSGSIZE;
 
     if (!dev->netdev_ops->ndo_get_vf_config)
         return 0;
 
     vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST);
     if (!vfinfo)
         return -EMSGSIZE;
 
     for (i = 0; i < num_vfs; i++) {
         if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
             return -EMSGSIZE;
     }
 
     nla_nest_end(skb, vfinfo);
     return 0;
 }
 
 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
 {
     struct rtnl_link_ifmap map;
 
     memset(&map, 0, sizeof(map));
     map.mem_start   = dev->mem_start;
     map.mem_end     = dev->mem_end;
     map.base_addr   = dev->base_addr;
     map.irq         = dev->irq;
     map.dma         = dev->dma;
     map.port        = dev->if_port;
 
     if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
         return -EMSGSIZE;
 
     return 0;
 }
 
 static u32 rtnl_xdp_prog_skb(struct net_device *dev)
 {
     const struct bpf_prog *generic_xdp_prog;
 
     ASSERT_RTNL();
 
     generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
     if (!generic_xdp_prog)
         return 0;
     return generic_xdp_prog->aux->id;
 }
 
 static u32 rtnl_xdp_prog_drv(struct net_device *dev)
 {
     return dev_xdp_prog_id(dev, XDP_MODE_DRV);
 }
 
 static u32 rtnl_xdp_prog_hw(struct net_device *dev)
 {
     return dev_xdp_prog_id(dev, XDP_MODE_HW);
 }
 
 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
                    u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
                    u32 (*get_prog_id)(struct net_device *dev))
 {
     u32 curr_id;
     int err;
 
     curr_id = get_prog_id(dev);
     if (!curr_id)
         return 0;
 
     *prog_id = curr_id;
     err = nla_put_u32(skb, attr, curr_id);
     if (err)
         return err;
 
     if (*mode != XDP_ATTACHED_NONE)
         *mode = XDP_ATTACHED_MULTI;
     else
         *mode = tgt_mode;
 
     return 0;
 }
 
 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
 {
     struct nlattr *xdp;
     u32 prog_id;
     int err;
     u8 mode;
 
     xdp = nla_nest_start_noflag(skb, IFLA_XDP);
     if (!xdp)
         return -EMSGSIZE;
 
     prog_id = 0;
     mode = XDP_ATTACHED_NONE;
     err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
                   IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
     if (err)
         goto err_cancel;
     err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
                   IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
     if (err)
         goto err_cancel;
     err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
                   IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
     if (err)
         goto err_cancel;
 
     err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
     if (err)
         goto err_cancel;
 
     if (prog_id && mode != XDP_ATTACHED_MULTI) {
         err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
         if (err)
             goto err_cancel;
     }
 
     nla_nest_end(skb, xdp);
     return 0;
 
 err_cancel:
     nla_nest_cancel(skb, xdp);
     return err;
 }
 
 static u32 rtnl_get_event(unsigned long event)
 {
     u32 rtnl_event_type = IFLA_EVENT_NONE;
 
     switch (event) {
     case NETDEV_REBOOT:
         rtnl_event_type = IFLA_EVENT_REBOOT;
         break;
     case NETDEV_FEAT_CHANGE:
         rtnl_event_type = IFLA_EVENT_FEATURES;
         break;
     case NETDEV_BONDING_FAILOVER:
         rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
         break;
     case NETDEV_NOTIFY_PEERS:
         rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
         break;
     case NETDEV_RESEND_IGMP:
         rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
         break;
     case NETDEV_CHANGEINFODATA:
         rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
         break;
     default:
         break;
     }
 
     return rtnl_event_type;
 }
 
 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
 {
     const struct net_device *upper_dev;
     int ret = 0;
 
     rcu_read_lock();
 
     upper_dev = netdev_master_upper_dev_get_rcu(dev);
     if (upper_dev)
         ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
 
     rcu_read_unlock();
     return ret;
 }
 
 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
               bool force)
 {
     int ifindex = dev_get_iflink(dev);
 
     if (force || dev->ifindex != ifindex)
         return nla_put_u32(skb, IFLA_LINK, ifindex);
 
     return 0;
 }
 
 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
                           struct net_device *dev)
 {
     char buf[IFALIASZ];
     int ret;
 
     ret = dev_get_alias(dev, buf, sizeof(buf));
     return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
 }
 
 static int rtnl_fill_link_netnsid(struct sk_buff *skb,
                   const struct net_device *dev,
                   struct net *src_net, gfp_t gfp)
 {
     bool put_iflink = false;
 
     if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
         struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
 
         if (!net_eq(dev_net(dev), link_net)) {
             int id = peernet2id_alloc(src_net, link_net, gfp);
 
             if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
                 return -EMSGSIZE;
 
             put_iflink = true;
         }
     }
 
     return nla_put_iflink(skb, dev, put_iflink);
 }
 
 static int rtnl_fill_link_af(struct sk_buff *skb,
                  const struct net_device *dev,
                  u32 ext_filter_mask)
 {
     const struct rtnl_af_ops *af_ops;
     struct nlattr *af_spec;
 
     af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
     if (!af_spec)
         return -EMSGSIZE;
 
     list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
         struct nlattr *af;
         int err;
 
         if (!af_ops->fill_link_af)
             continue;
 
         af = nla_nest_start_noflag(skb, af_ops->family);
         if (!af)
             return -EMSGSIZE;
 
         err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
         /*
          * Caller may return ENODATA to indicate that there
          * was no data to be dumped. This is not an error, it
          * means we should trim the attribute header and
          * continue.
          */
         if (err == -ENODATA)
             nla_nest_cancel(skb, af);
         else if (err < 0)
             return -EMSGSIZE;
 
         nla_nest_end(skb, af);
     }
 
     nla_nest_end(skb, af_spec);
     return 0;
 }
 
 static int rtnl_fill_alt_ifnames(struct sk_buff *skb,
                  const struct net_device *dev)
 {
     struct netdev_name_node *name_node;
     int count = 0;
 
     list_for_each_entry(name_node, &dev->name_node->list, list) {
         if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name))
             return -EMSGSIZE;
         count++;
     }
     return count;
 }
 
 static int rtnl_fill_prop_list(struct sk_buff *skb,
                    const struct net_device *dev)
 {
     struct nlattr *prop_list;
     int ret;
 
     prop_list = nla_nest_start(skb, IFLA_PROP_LIST);
     if (!prop_list)
         return -EMSGSIZE;
 
     ret = rtnl_fill_alt_ifnames(skb, dev);
     if (ret <= 0)
         goto nest_cancel;
 
     nla_nest_end(skb, prop_list);
     return 0;
 
 nest_cancel:
     nla_nest_cancel(skb, prop_list);
     return ret;
 }
 
 static int rtnl_fill_proto_down(struct sk_buff *skb,
                 const struct net_device *dev)
 {
     struct nlattr *pr;
     u32 preason;
 
     if (nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
         goto nla_put_failure;
 
     preason = dev->proto_down_reason;
     if (!preason)
         return 0;
 
     pr = nla_nest_start(skb, IFLA_PROTO_DOWN_REASON);
     if (!pr)
         return -EMSGSIZE;
 
     if (nla_put_u32(skb, IFLA_PROTO_DOWN_REASON_VALUE, preason)) {
         nla_nest_cancel(skb, pr);
         goto nla_put_failure;
     }
 
     nla_nest_end(skb, pr);
     return 0;
 
 nla_put_failure:
     return -EMSGSIZE;
 }
 
 static int rtnl_fill_ifinfo(struct sk_buff *skb,
                 struct net_device *dev, struct net *src_net,
                 int type, u32 pid, u32 seq, u32 change,
                 unsigned int flags, u32 ext_filter_mask,
                 u32 event, int *new_nsid, int new_ifindex,
                 int tgt_netnsid, gfp_t gfp)
 {
     struct ifinfomsg *ifm;
     struct nlmsghdr *nlh;
     struct Qdisc *qdisc;
 
     ASSERT_RTNL();
     nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
     if (nlh == NULL)
         return -EMSGSIZE;
 
     ifm = nlmsg_data(nlh);
     ifm->ifi_family = AF_UNSPEC;
     ifm->__ifi_pad = 0;
     ifm->ifi_type = dev->type;
     ifm->ifi_index = dev->ifindex;
     ifm->ifi_flags = dev_get_flags(dev);
     ifm->ifi_change = change;
 
     if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
         goto nla_put_failure;
 
     qdisc = rtnl_dereference(dev->qdisc);
     if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
         nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
         nla_put_u8(skb, IFLA_OPERSTATE,
                netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
         nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
         nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
         nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
         nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
         nla_put_u32(skb, IFLA_GROUP, dev->group) ||
         nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
         nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
         nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
         nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
         nla_put_u32(skb, IFLA_GRO_MAX_SIZE, dev->gro_max_size) ||
         nla_put_u32(skb, IFLA_TSO_MAX_SIZE, dev->tso_max_size) ||
         nla_put_u32(skb, IFLA_TSO_MAX_SEGS, dev->tso_max_segs) ||
 #ifdef CONFIG_RPS
         nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
 #endif
         put_master_ifindex(skb, dev) ||
         nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
         (qdisc &&
          nla_put_string(skb, IFLA_QDISC, qdisc->ops->id)) ||
         nla_put_ifalias(skb, dev) ||
         nla_put_u32(skb, IFLA_CARRIER_CHANGES,
             atomic_read(&dev->carrier_up_count) +
             atomic_read(&dev->carrier_down_count)) ||
         nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
             atomic_read(&dev->carrier_up_count)) ||
         nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
             atomic_read(&dev->carrier_down_count)))
         goto nla_put_failure;
 
     if (rtnl_fill_proto_down(skb, dev))
         goto nla_put_failure;
 
     if (event != IFLA_EVENT_NONE) {
         if (nla_put_u32(skb, IFLA_EVENT, event))
             goto nla_put_failure;
     }
 
     if (rtnl_fill_link_ifmap(skb, dev))
         goto nla_put_failure;
 
     if (dev->addr_len) {
         if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
             nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
             goto nla_put_failure;
     }
 
     if (rtnl_phys_port_id_fill(skb, dev))
         goto nla_put_failure;
 
     if (rtnl_phys_port_name_fill(skb, dev))
         goto nla_put_failure;
 
     if (rtnl_phys_switch_id_fill(skb, dev))
         goto nla_put_failure;
 
     if (rtnl_fill_stats(skb, dev))
         goto nla_put_failure;
 
     if (rtnl_fill_vf(skb, dev, ext_filter_mask))
         goto nla_put_failure;
 
     if (rtnl_port_fill(skb, dev, ext_filter_mask))
         goto nla_put_failure;
 
     if (rtnl_xdp_fill(skb, dev))
         goto nla_put_failure;
 
     if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
         if (rtnl_link_fill(skb, dev) < 0)
             goto nla_put_failure;
     }
 
     if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp))
         goto nla_put_failure;
 
     if (new_nsid &&
         nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
         goto nla_put_failure;
     if (new_ifindex &&
         nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
         goto nla_put_failure;
 
     if (memchr_inv(dev->perm_addr, '\0', dev->addr_len) &&
         nla_put(skb, IFLA_PERM_ADDRESS, dev->addr_len, dev->perm_addr))
         goto nla_put_failure;
 
     rcu_read_lock();
     if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
         goto nla_put_failure_rcu;
     rcu_read_unlock();
 
     if (rtnl_fill_prop_list(skb, dev))
         goto nla_put_failure;
 
     if (dev->dev.parent &&
         nla_put_string(skb, IFLA_PARENT_DEV_NAME,
                dev_name(dev->dev.parent)))
         goto nla_put_failure;
 
     if (dev->dev.parent && dev->dev.parent->bus &&
         nla_put_string(skb, IFLA_PARENT_DEV_BUS_NAME,
                dev->dev.parent->bus->name))
         goto nla_put_failure;
 
     nlmsg_end(skb, nlh);
     return 0;
 
 nla_put_failure_rcu:
     rcu_read_unlock();
 nla_put_failure:
     nlmsg_cancel(skb, nlh);
     return -EMSGSIZE;
 }
 
 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
     [IFLA_IFNAME]       = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
     [IFLA_ADDRESS]      = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
     [IFLA_BROADCAST]    = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
     [IFLA_MAP]      = { .len = sizeof(struct rtnl_link_ifmap) },
     [IFLA_MTU]      = { .type = NLA_U32 },
     [IFLA_LINK]     = { .type = NLA_U32 },
     [IFLA_MASTER]       = { .type = NLA_U32 },
     [IFLA_CARRIER]      = { .type = NLA_U8 },
     [IFLA_TXQLEN]       = { .type = NLA_U32 },
     [IFLA_WEIGHT]       = { .type = NLA_U32 },
     [IFLA_OPERSTATE]    = { .type = NLA_U8 },
     [IFLA_LINKMODE]     = { .type = NLA_U8 },
     [IFLA_LINKINFO]     = { .type = NLA_NESTED },
     [IFLA_NET_NS_PID]   = { .type = NLA_U32 },
     [IFLA_NET_NS_FD]    = { .type = NLA_U32 },
     /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
      * allow 0-length string (needed to remove an alias).
      */
     [IFLA_IFALIAS]          = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
     [IFLA_VFINFO_LIST]  = {. type = NLA_NESTED },
     [IFLA_VF_PORTS]     = { .type = NLA_NESTED },
     [IFLA_PORT_SELF]    = { .type = NLA_NESTED },
     [IFLA_AF_SPEC]      = { .type = NLA_NESTED },
     [IFLA_EXT_MASK]     = { .type = NLA_U32 },
     [IFLA_PROMISCUITY]  = { .type = NLA_U32 },
     [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
     [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
     [IFLA_GSO_MAX_SEGS] = { .type = NLA_U32 },
     [IFLA_GSO_MAX_SIZE] = { .type = NLA_U32 },
     [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
     [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
     [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
     [IFLA_LINK_NETNSID] = { .type = NLA_S32 },
     [IFLA_PROTO_DOWN]   = { .type = NLA_U8 },
     [IFLA_XDP]      = { .type = NLA_NESTED },
     [IFLA_EVENT]        = { .type = NLA_U32 },
     [IFLA_GROUP]        = { .type = NLA_U32 },
     [IFLA_TARGET_NETNSID]   = { .type = NLA_S32 },
     [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 },
     [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
     [IFLA_MIN_MTU]      = { .type = NLA_U32 },
     [IFLA_MAX_MTU]      = { .type = NLA_U32 },
     [IFLA_PROP_LIST]    = { .type = NLA_NESTED },
     [IFLA_ALT_IFNAME]   = { .type = NLA_STRING,
                     .len = ALTIFNAMSIZ - 1 },
     [IFLA_PERM_ADDRESS] = { .type = NLA_REJECT },
     [IFLA_PROTO_DOWN_REASON] = { .type = NLA_NESTED },
     [IFLA_NEW_IFINDEX]  = NLA_POLICY_MIN(NLA_S32, 1),
     [IFLA_PARENT_DEV_NAME]  = { .type = NLA_NUL_STRING },
     [IFLA_GRO_MAX_SIZE] = { .type = NLA_U32 },
     [IFLA_TSO_MAX_SIZE] = { .type = NLA_REJECT },
     [IFLA_TSO_MAX_SEGS] = { .type = NLA_REJECT },
 };
 
 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
     [IFLA_INFO_KIND]    = { .type = NLA_STRING },
     [IFLA_INFO_DATA]    = { .type = NLA_NESTED },
     [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
     [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
 };
 
 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
     [IFLA_VF_MAC]       = { .len = sizeof(struct ifla_vf_mac) },
     [IFLA_VF_BROADCAST] = { .type = NLA_REJECT },
     [IFLA_VF_VLAN]      = { .len = sizeof(struct ifla_vf_vlan) },
     [IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
     [IFLA_VF_TX_RATE]   = { .len = sizeof(struct ifla_vf_tx_rate) },
     [IFLA_VF_SPOOFCHK]  = { .len = sizeof(struct ifla_vf_spoofchk) },
     [IFLA_VF_RATE]      = { .len = sizeof(struct ifla_vf_rate) },
     [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
     [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
     [IFLA_VF_STATS]     = { .type = NLA_NESTED },
     [IFLA_VF_TRUST]     = { .len = sizeof(struct ifla_vf_trust) },
     [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
     [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
 };
 
 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
     [IFLA_PORT_VF]      = { .type = NLA_U32 },
     [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
                     .len = PORT_PROFILE_MAX },
     [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
                       .len = PORT_UUID_MAX },
     [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
                     .len = PORT_UUID_MAX },
     [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
     [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
 
     /* Unused, but we need to keep it here since user space could
      * fill it. It's also broken with regard to NLA_BINARY use in
      * combination with structs.
      */
     [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
                     .len = sizeof(struct ifla_port_vsi) },
 };
 
 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
     [IFLA_XDP_UNSPEC]   = { .strict_start_type = IFLA_XDP_EXPECTED_FD },
     [IFLA_XDP_FD]       = { .type = NLA_S32 },
     [IFLA_XDP_EXPECTED_FD]  = { .type = NLA_S32 },
     [IFLA_XDP_ATTACHED] = { .type = NLA_U8 },
     [IFLA_XDP_FLAGS]    = { .type = NLA_U32 },
     [IFLA_XDP_PROG_ID]  = { .type = NLA_U32 },
 };
 
 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
 {
     const struct rtnl_link_ops *ops = NULL;
     struct nlattr *linfo[IFLA_INFO_MAX + 1];
 
     if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0)
         return NULL;
 
     if (linfo[IFLA_INFO_KIND]) {
         char kind[MODULE_NAME_LEN];
 
         nla_strscpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
         ops = rtnl_link_ops_get(kind);
     }
 
     return ops;
 }
 
 static bool link_master_filtered(struct net_device *dev, int master_idx)
 {
     struct net_device *master;
 
     if (!master_idx)
         return false;
 
     master = netdev_master_upper_dev_get(dev);
 
     /* 0 is already used to denote IFLA_MASTER wasn't passed, therefore need
      * another invalid value for ifindex to denote "no master".
      */
     if (master_idx == -1)
         return !!master;
 
     if (!master || master->ifindex != master_idx)
         return true;
 
     return false;
 }
 
 static bool link_kind_filtered(const struct net_device *dev,
                    const struct rtnl_link_ops *kind_ops)
 {
     if (kind_ops && dev->rtnl_link_ops != kind_ops)
         return true;
 
     return false;
 }
 
 static bool link_dump_filtered(struct net_device *dev,
                    int master_idx,
                    const struct rtnl_link_ops *kind_ops)
 {
     if (link_master_filtered(dev, master_idx) ||
         link_kind_filtered(dev, kind_ops))
         return true;
 
     return false;
 }
 
 /**
  * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.
  * @sk: netlink socket
  * @netnsid: network namespace identifier
  *
  * Returns the network namespace identified by netnsid on success or an error
  * pointer on failure.
  */
 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)
 {
     struct net *net;
 
     net = get_net_ns_by_id(sock_net(sk), netnsid);
     if (!net)
         return ERR_PTR(-EINVAL);
 
     /* For now, the caller is required to have CAP_NET_ADMIN in
      * the user namespace owning the target net ns.
      */
     if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
         put_net(net);
         return ERR_PTR(-EACCES);
     }
     return net;
 }
 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);
 
 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh,
                       bool strict_check, struct nlattr **tb,
                       struct netlink_ext_ack *extack)
 {
     int hdrlen;
 
     if (strict_check) {
         struct ifinfomsg *ifm;
 
         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
             NL_SET_ERR_MSG(extack, "Invalid header for link dump");
             return -EINVAL;
         }
 
         ifm = nlmsg_data(nlh);
         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
             ifm->ifi_change) {
             NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request");
             return -EINVAL;
         }
         if (ifm->ifi_index) {
             NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps");
             return -EINVAL;
         }
 
         return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb,
                              IFLA_MAX, ifla_policy,
                              extack);
     }
 
     /* A hack to preserve kernel<->userspace interface.
      * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
      * However, before Linux v3.9 the code here assumed rtgenmsg and that's
      * what iproute2 < v3.9.0 used.
      * We can detect the old iproute2. Even including the IFLA_EXT_MASK
      * attribute, its netlink message is shorter than struct ifinfomsg.
      */
     hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
          sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
 
     return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy,
                       extack);
 }
 
 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 {
     struct netlink_ext_ack *extack = cb->extack;
     const struct nlmsghdr *nlh = cb->nlh;
     struct net *net = sock_net(skb->sk);
     struct net *tgt_net = net;
     int h, s_h;
     int idx = 0, s_idx;
     struct net_device *dev;
     struct hlist_head *head;
     struct nlattr *tb[IFLA_MAX+1];
     u32 ext_filter_mask = 0;
     const struct rtnl_link_ops *kind_ops = NULL;
     unsigned int flags = NLM_F_MULTI;
     int master_idx = 0;
     int netnsid = -1;
     int err, i;
 
     s_h = cb->args[0];
     s_idx = cb->args[1];
 
     err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack);
     if (err < 0) {
         if (cb->strict_check)
             return err;
 
         goto walk_entries;
     }
 
     for (i = 0; i <= IFLA_MAX; ++i) {
         if (!tb[i])
             continue;
 
         /* new attributes should only be added with strict checking */
         switch (i) {
         case IFLA_TARGET_NETNSID:
             netnsid = nla_get_s32(tb[i]);
             tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid);
             if (IS_ERR(tgt_net)) {
                 NL_SET_ERR_MSG(extack, "Invalid target network namespace id");
                 return PTR_ERR(tgt_net);
             }
             break;
         case IFLA_EXT_MASK:
             ext_filter_mask = nla_get_u32(tb[i]);
             break;
         case IFLA_MASTER:
             master_idx = nla_get_u32(tb[i]);
             break;
         case IFLA_LINKINFO:
             kind_ops = linkinfo_to_kind_ops(tb[i]);
             break;
         default:
             if (cb->strict_check) {
                 NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request");
                 return -EINVAL;
             }
         }
     }
 
     if (master_idx || kind_ops)
         flags |= NLM_F_DUMP_FILTERED;
 
 walk_entries:
     for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
         idx = 0;
         head = &tgt_net->dev_index_head[h];
         hlist_for_each_entry(dev, head, index_hlist) {
             if (link_dump_filtered(dev, master_idx, kind_ops))
                 goto cont;
             if (idx < s_idx)
                 goto cont;
             err = rtnl_fill_ifinfo(skb, dev, net,
                            RTM_NEWLINK,
                            NETLINK_CB(cb->skb).portid,
                            nlh->nlmsg_seq, 0, flags,
                            ext_filter_mask, 0, NULL, 0,
                            netnsid, GFP_KERNEL);
 
             if (err < 0) {
                 if (likely(skb->len))
                     goto out;
 
                 goto out_err;
             }
 cont:
             idx++;
         }
     }
 out:
     err = skb->len;
 out_err:
     cb->args[1] = idx;
     cb->args[0] = h;
     cb->seq = tgt_net->dev_base_seq;
     nl_dump_check_consistent(cb, nlmsg_hdr(skb));
     if (netnsid >= 0)
         put_net(tgt_net);
 
     return err;
 }
 
 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
             struct netlink_ext_ack *exterr)
 {
     return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy,
                     exterr);
 }
 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
 
 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
 {
     struct net *net;
     /* Examine the link attributes and figure out which
      * network namespace we are talking about.
      */
     if (tb[IFLA_NET_NS_PID])
         net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
     else if (tb[IFLA_NET_NS_FD])
         net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
     else
         net = get_net(src_net);
     return net;
 }
 EXPORT_SYMBOL(rtnl_link_get_net);
 
 /* Figure out which network namespace we are talking about by
  * examining the link attributes in the following order:
  *
  * 1. IFLA_NET_NS_PID
  * 2. IFLA_NET_NS_FD
  * 3. IFLA_TARGET_NETNSID
  */
 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
                            struct nlattr *tb[])
 {
     struct net *net;
 
     if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
         return rtnl_link_get_net(src_net, tb);
 
     if (!tb[IFLA_TARGET_NETNSID])
         return get_net(src_net);
 
     net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID]));
     if (!net)
         return ERR_PTR(-EINVAL);
 
     return net;
 }
 
 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
                          struct net *src_net,
                          struct nlattr *tb[], int cap)
 {
     struct net *net;
 
     net = rtnl_link_get_net_by_nlattr(src_net, tb);
     if (IS_ERR(net))
         return net;
 
     if (!netlink_ns_capable(skb, net->user_ns, cap)) {
         put_net(net);
         return ERR_PTR(-EPERM);
     }
 
     return net;
 }
 
 /* Verify that rtnetlink requests do not pass additional properties
  * potentially referring to different network namespaces.
  */
 static int rtnl_ensure_unique_netns(struct nlattr *tb[],
                     struct netlink_ext_ack *extack,
                     bool netns_id_only)
 {
 
     if (netns_id_only) {
         if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
             return 0;
 
         NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
         return -EOPNOTSUPP;
     }
 
     if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
         goto invalid_attr;
 
     if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD]))
         goto invalid_attr;
 
     if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID]))
         goto invalid_attr;
 
     return 0;
 
 invalid_attr:
     NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
     return -EINVAL;
 }
 
 static  int rtnl_set_vf_rate(struct net_device *dev, int vf, int min_tx_rate,
                  int max_tx_rate)
 {
     const struct net_device_ops *ops = dev->netdev_ops;
 
     if (!ops->ndo_set_vf_rate)
         return -EOPNOTSUPP;
     if (max_tx_rate && max_tx_rate < min_tx_rate)
         return -EINVAL;
 
     return ops->ndo_set_vf_rate(dev, vf, min_tx_rate, max_tx_rate);
 }
 
 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[],
                 struct netlink_ext_ack *extack)
 {
     if (dev) {
         if (tb[IFLA_ADDRESS] &&
             nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
             return -EINVAL;
 
         if (tb[IFLA_BROADCAST] &&
             nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
             return -EINVAL;
     }
 
     if (tb[IFLA_AF_SPEC]) {
         struct nlattr *af;
         int rem, err;
 
         nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
             const struct rtnl_af_ops *af_ops;
 
             af_ops = rtnl_af_lookup(nla_type(af));
             if (!af_ops)
                 return -EAFNOSUPPORT;
 
             if (!af_ops->set_link_af)
                 return -EOPNOTSUPP;
 
             if (af_ops->validate_link_af) {
                 err = af_ops->validate_link_af(dev, af, extack);
                 if (err < 0)
                     return err;
             }
         }
     }
 
     return 0;
 }
 
 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
                   int guid_type)
 {
     const struct net_device_ops *ops = dev->netdev_ops;
 
     return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
 }
 
 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
 {
     if (dev->type != ARPHRD_INFINIBAND)
         return -EOPNOTSUPP;
 
     return handle_infiniband_guid(dev, ivt, guid_type);
 }
 
 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
 {
     const struct net_device_ops *ops = dev->netdev_ops;
     int err = -EINVAL;
 
     if (tb[IFLA_VF_MAC]) {
         struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
 
         if (ivm->vf >= INT_MAX)
             return -EINVAL;
         err = -EOPNOTSUPP;
         if (ops->ndo_set_vf_mac)
             err = ops->ndo_set_vf_mac(dev, ivm->vf,
                           ivm->mac);
         if (err < 0)
             return err;
     }
 
     if (tb[IFLA_VF_VLAN]) {
         struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
 
         if (ivv->vf >= INT_MAX)
             return -EINVAL;
         err = -EOPNOTSUPP;
         if (ops->ndo_set_vf_vlan)
             err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
                            ivv->qos,
                            htons(ETH_P_8021Q));
         if (err < 0)
             return err;
     }
 
     if (tb[IFLA_VF_VLAN_LIST]) {
         struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
         struct nlattr *attr;
         int rem, len = 0;
 
         err = -EOPNOTSUPP;
         if (!ops->ndo_set_vf_vlan)
             return err;
 
         nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
             if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
                 nla_len(attr) < NLA_HDRLEN) {
                 return -EINVAL;
             }
             if (len >= MAX_VLAN_LIST_LEN)
                 return -EOPNOTSUPP;
             ivvl[len] = nla_data(attr);
 
             len++;
         }
         if (len == 0)
             return -EINVAL;
 
         if (ivvl[0]->vf >= INT_MAX)
             return -EINVAL;
         err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
                        ivvl[0]->qos, ivvl[0]->vlan_proto);
         if (err < 0)
             return err;
     }
 
     if (tb[IFLA_VF_TX_RATE]) {
         struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
         struct ifla_vf_info ivf;
 
         if (ivt->vf >= INT_MAX)
             return -EINVAL;
         err = -EOPNOTSUPP;
         if (ops->ndo_get_vf_config)
             err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
         if (err < 0)
             return err;
 
         err = rtnl_set_vf_rate(dev, ivt->vf,
                        ivf.min_tx_rate, ivt->rate);
         if (err < 0)
             return err;
     }
 
     if (tb[IFLA_VF_RATE]) {
         struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
 
         if (ivt->vf >= INT_MAX)
             return -EINVAL;
 
         err = rtnl_set_vf_rate(dev, ivt->vf,
                        ivt->min_tx_rate, ivt->max_tx_rate);
         if (err < 0)
             return err;
     }
 
     if (tb[IFLA_VF_SPOOFCHK]) {
         struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
 
         if (ivs->vf >= INT_MAX)
             return -EINVAL;
         err = -EOPNOTSUPP;
         if (ops->ndo_set_vf_spoofchk)
             err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
                                ivs->setting);
         if (err < 0)
             return err;
     }
 
     if (tb[IFLA_VF_LINK_STATE]) {
         struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
 
         if (ivl->vf >= INT_MAX)
             return -EINVAL;
         err = -EOPNOTSUPP;
         if (ops->ndo_set_vf_link_state)
             err = ops->ndo_set_vf_link_state(dev, ivl->vf,
                              ivl->link_state);
         if (err < 0)
             return err;
     }
 
     if (tb[IFLA_VF_RSS_QUERY_EN]) {
         struct ifla_vf_rss_query_en *ivrssq_en;
 
         err = -EOPNOTSUPP;
         ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
         if (ivrssq_en->vf >= INT_MAX)
             return -EINVAL;
         if (ops->ndo_set_vf_rss_query_en)
             err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
                                ivrssq_en->setting);
         if (err < 0)
             return err;
     }
 
     if (tb[IFLA_VF_TRUST]) {
         struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
 
         if (ivt->vf >= INT_MAX)
             return -EINVAL;
         err = -EOPNOTSUPP;
         if (ops->ndo_set_vf_trust)
             err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
         if (err < 0)
             return err;
     }
 
     if (tb[IFLA_VF_IB_NODE_GUID]) {
         struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
 
         if (ivt->vf >= INT_MAX)
             return -EINVAL;
         if (!ops->ndo_set_vf_guid)
             return -EOPNOTSUPP;
         return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
     }
 
     if (tb[IFLA_VF_IB_PORT_GUID]) {
         struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
 
         if (ivt->vf >= INT_MAX)
             return -EINVAL;
         if (!ops->ndo_set_vf_guid)
             return -EOPNOTSUPP;
 
         return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
     }
 
     return err;
 }
 
 static int do_set_master(struct net_device *dev, int ifindex,
              struct netlink_ext_ack *extack)
 {
     struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
     const struct net_device_ops *ops;
     int err;
 
     if (upper_dev) {
         if (upper_dev->ifindex == ifindex)
             return 0;
         ops = upper_dev->netdev_ops;
         if (ops->ndo_del_slave) {
             err = ops->ndo_del_slave(upper_dev, dev);
             if (err)
                 return err;
         } else {
             return -EOPNOTSUPP;
         }
     }
 
     if (ifindex) {
         upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
         if (!upper_dev)
             return -EINVAL;
         ops = upper_dev->netdev_ops;
         if (ops->ndo_add_slave) {
             err = ops->ndo_add_slave(upper_dev, dev, extack);
             if (err)
                 return err;
         } else {
             return -EOPNOTSUPP;
         }
     }
     return 0;
 }
 
 static const struct nla_policy ifla_proto_down_reason_policy[IFLA_PROTO_DOWN_REASON_VALUE + 1] = {
     [IFLA_PROTO_DOWN_REASON_MASK]   = { .type = NLA_U32 },
     [IFLA_PROTO_DOWN_REASON_VALUE]  = { .type = NLA_U32 },
 };
 
 static int do_set_proto_down(struct net_device *dev,
                  struct nlattr *nl_proto_down,
                  struct nlattr *nl_proto_down_reason,
                  struct netlink_ext_ack *extack)
 {
     struct nlattr *pdreason[IFLA_PROTO_DOWN_REASON_MAX + 1];
     unsigned long mask = 0;
     u32 value;
     bool proto_down;
     int err;
 
     if (!(dev->priv_flags & IFF_CHANGE_PROTO_DOWN)) {
         NL_SET_ERR_MSG(extack,  "Protodown not supported by device");
         return -EOPNOTSUPP;
     }
 
     if (nl_proto_down_reason) {
         err = nla_parse_nested_deprecated(pdreason,
                           IFLA_PROTO_DOWN_REASON_MAX,
                           nl_proto_down_reason,
                           ifla_proto_down_reason_policy,
                           NULL);
         if (err < 0)
             return err;
 
         if (!pdreason[IFLA_PROTO_DOWN_REASON_VALUE]) {
             NL_SET_ERR_MSG(extack, "Invalid protodown reason value");
             return -EINVAL;
         }
 
         value = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_VALUE]);
 
         if (pdreason[IFLA_PROTO_DOWN_REASON_MASK])
             mask = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_MASK]);
 
         dev_change_proto_down_reason(dev, mask, value);
     }
 
     if (nl_proto_down) {
         proto_down = nla_get_u8(nl_proto_down);
 
         /* Don't turn off protodown if there are active reasons */
         if (!proto_down && dev->proto_down_reason) {
             NL_SET_ERR_MSG(extack, "Cannot clear protodown, active reasons");
             return -EBUSY;
         }
         err = dev_change_proto_down(dev,
                         proto_down);
         if (err)
             return err;
     }
 
     return 0;
 }
 
 #define DO_SETLINK_MODIFIED 0x01
 /* notify flag means notify + modified. */
 #define DO_SETLINK_NOTIFY   0x03
 static int do_setlink(const struct sk_buff *skb,
               struct net_device *dev, struct ifinfomsg *ifm,
               struct netlink_ext_ack *extack,
               struct nlattr **tb, int status)
 {
     const struct net_device_ops *ops = dev->netdev_ops;
     char ifname[IFNAMSIZ];
     int err;
 
     err = validate_linkmsg(dev, tb, extack);
     if (err < 0)
         return err;
 
     if (tb[IFLA_IFNAME])
         nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
     else
         ifname[0] = '\0';
 
     if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) {
         const char *pat = ifname[0] ? ifname : NULL;
         struct net *net;
         int new_ifindex;
 
         net = rtnl_link_get_net_capable(skb, dev_net(dev),
                         tb, CAP_NET_ADMIN);
         if (IS_ERR(net)) {
             err = PTR_ERR(net);
             goto errout;
         }
 
         if (tb[IFLA_NEW_IFINDEX])
             new_ifindex = nla_get_s32(tb[IFLA_NEW_IFINDEX]);
         else
             new_ifindex = 0;
 
         err = __dev_change_net_namespace(dev, net, pat, new_ifindex);
         put_net(net);
         if (err)
             goto errout;
         status |= DO_SETLINK_MODIFIED;
     }
 
     if (tb[IFLA_MAP]) {
         struct rtnl_link_ifmap *u_map;
         struct ifmap k_map;
 
         if (!ops->ndo_set_config) {
             err = -EOPNOTSUPP;
             goto errout;
         }
 
         if (!netif_device_present(dev)) {
             err = -ENODEV;
             goto errout;
         }
 
         u_map = nla_data(tb[IFLA_MAP]);
         k_map.mem_start = (unsigned long) u_map->mem_start;
         k_map.mem_end = (unsigned long) u_map->mem_end;
         k_map.base_addr = (unsigned short) u_map->base_addr;
         k_map.irq = (unsigned char) u_map->irq;
         k_map.dma = (unsigned char) u_map->dma;
         k_map.port = (unsigned char) u_map->port;
 
         err = ops->ndo_set_config(dev, &k_map);
         if (err < 0)
             goto errout;
 
         status |= DO_SETLINK_NOTIFY;
     }
 
     if (tb[IFLA_ADDRESS]) {
         struct sockaddr *sa;
         int len;
 
         len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
                           sizeof(*sa));
         sa = kmalloc(len, GFP_KERNEL);
         if (!sa) {
             err = -ENOMEM;
             goto errout;
         }
         sa->sa_family = dev->type;
         memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
                dev->addr_len);
         err = dev_set_mac_address_user(dev, sa, extack);
         kfree(sa);
         if (err)
             goto errout;
         status |= DO_SETLINK_MODIFIED;
     }
 
     if (tb[IFLA_MTU]) {
         err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack);
         if (err < 0)
             goto errout;
         status |= DO_SETLINK_MODIFIED;
     }
 
     if (tb[IFLA_GROUP]) {
         dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
         status |= DO_SETLINK_NOTIFY;
     }
 
     /*
      * Interface selected by interface index but interface
      * name provided implies that a name change has been
      * requested.
      */
     if (ifm->ifi_index > 0 && ifname[0]) {
         err = dev_change_name(dev, ifname);
         if (err < 0)
             goto errout;
         status |= DO_SETLINK_MODIFIED;
     }
 
     if (tb[IFLA_IFALIAS]) {
         err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
                     nla_len(tb[IFLA_IFALIAS]));
         if (err < 0)
             goto errout;
         status |= DO_SETLINK_NOTIFY;
     }
 
     if (tb[IFLA_BROADCAST]) {
         nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
         call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
     }
 
     if (ifm->ifi_flags || ifm->ifi_change) {
         err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
                        extack);
         if (err < 0)
             goto errout;
     }
 
     if (tb[IFLA_MASTER]) {
         err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
         if (err)
             goto errout;
         status |= DO_SETLINK_MODIFIED;
     }
 
     if (tb[IFLA_CARRIER]) {
         err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
         if (err)
             goto errout;
         status |= DO_SETLINK_MODIFIED;
     }
 
     if (tb[IFLA_TXQLEN]) {
         unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
 
         err = dev_change_tx_queue_len(dev, value);
         if (err)
             goto errout;
         status |= DO_SETLINK_MODIFIED;
     }
 
     if (tb[IFLA_GSO_MAX_SIZE]) {
         u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
 
         if (max_size > dev->tso_max_size) {
             err = -EINVAL;
             goto errout;
         }
 
         if (dev->gso_max_size ^ max_size) {
             netif_set_gso_max_size(dev, max_size);
             status |= DO_SETLINK_MODIFIED;
         }
     }
 
     if (tb[IFLA_GSO_MAX_SEGS]) {
         u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
 
         if (max_segs > GSO_MAX_SEGS || max_segs > dev->tso_max_segs) {
             err = -EINVAL;
             goto errout;
         }
 
         if (dev->gso_max_segs ^ max_segs) {
             netif_set_gso_max_segs(dev, max_segs);
             status |= DO_SETLINK_MODIFIED;
         }
     }
 
     if (tb[IFLA_GRO_MAX_SIZE]) {
         u32 gro_max_size = nla_get_u32(tb[IFLA_GRO_MAX_SIZE]);
 
         if (dev->gro_max_size ^ gro_max_size) {
             netif_set_gro_max_size(dev, gro_max_size);
             status |= DO_SETLINK_MODIFIED;
         }
     }
 
     if (tb[IFLA_OPERSTATE])
         set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
 
     if (tb[IFLA_LINKMODE]) {
         unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
 
         write_lock(&dev_base_lock);
         if (dev->link_mode ^ value)
             status |= DO_SETLINK_NOTIFY;
         dev->link_mode = value;
         write_unlock(&dev_base_lock);
     }
 
     if (tb[IFLA_VFINFO_LIST]) {
         struct nlattr *vfinfo[IFLA_VF_MAX + 1];
         struct nlattr *attr;
         int rem;
 
         nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
             if (nla_type(attr) != IFLA_VF_INFO ||
                 nla_len(attr) < NLA_HDRLEN) {
                 err = -EINVAL;
                 goto errout;
             }
             err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX,
                               attr,
                               ifla_vf_policy,
                               NULL);
             if (err < 0)
                 goto errout;
             err = do_setvfinfo(dev, vfinfo);
             if (err < 0)
                 goto errout;
             status |= DO_SETLINK_NOTIFY;
         }
     }
     err = 0;
 
     if (tb[IFLA_VF_PORTS]) {
         struct nlattr *port[IFLA_PORT_MAX+1];
         struct nlattr *attr;
         int vf;
         int rem;
 
         err = -EOPNOTSUPP;
         if (!ops->ndo_set_vf_port)
             goto errout;
 
         nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
             if (nla_type(attr) != IFLA_VF_PORT ||
                 nla_len(attr) < NLA_HDRLEN) {
                 err = -EINVAL;
                 goto errout;
             }
             err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
                               attr,
                               ifla_port_policy,
                               NULL);
             if (err < 0)
                 goto errout;
             if (!port[IFLA_PORT_VF]) {
                 err = -EOPNOTSUPP;
                 goto errout;
             }
             vf = nla_get_u32(port[IFLA_PORT_VF]);
             err = ops->ndo_set_vf_port(dev, vf, port);
             if (err < 0)
                 goto errout;
             status |= DO_SETLINK_NOTIFY;
         }
     }
     err = 0;
 
     if (tb[IFLA_PORT_SELF]) {
         struct nlattr *port[IFLA_PORT_MAX+1];
 
         err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
                           tb[IFLA_PORT_SELF],
                           ifla_port_policy, NULL);
         if (err < 0)
             goto errout;
 
         err = -EOPNOTSUPP;
         if (ops->ndo_set_vf_port)
             err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
         if (err < 0)
             goto errout;
         status |= DO_SETLINK_NOTIFY;
     }
 
     if (tb[IFLA_AF_SPEC]) {
         struct nlattr *af;
         int rem;
 
         nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
             const struct rtnl_af_ops *af_ops;
 
             BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
 
             err = af_ops->set_link_af(dev, af, extack);
             if (err < 0)
                 goto errout;
 
             status |= DO_SETLINK_NOTIFY;
         }
     }
     err = 0;
 
     if (tb[IFLA_PROTO_DOWN] || tb[IFLA_PROTO_DOWN_REASON]) {
         err = do_set_proto_down(dev, tb[IFLA_PROTO_DOWN],
                     tb[IFLA_PROTO_DOWN_REASON], extack);
         if (err)
             goto errout;
         status |= DO_SETLINK_NOTIFY;
     }
 
     if (tb[IFLA_XDP]) {
         struct nlattr *xdp[IFLA_XDP_MAX + 1];
         u32 xdp_flags = 0;
 
         err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX,
                           tb[IFLA_XDP],
                           ifla_xdp_policy, NULL);
         if (err < 0)
             goto errout;
 
         if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
             err = -EINVAL;
             goto errout;
         }
 
         if (xdp[IFLA_XDP_FLAGS]) {
             xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
             if (xdp_flags & ~XDP_FLAGS_MASK) {
                 err = -EINVAL;
                 goto errout;
             }
             if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
                 err = -EINVAL;
                 goto errout;
             }
         }
 
         if (xdp[IFLA_XDP_FD]) {
             int expected_fd = -1;
 
             if (xdp_flags & XDP_FLAGS_REPLACE) {
                 if (!xdp[IFLA_XDP_EXPECTED_FD]) {
                     err = -EINVAL;
                     goto errout;
                 }
                 expected_fd =
                     nla_get_s32(xdp[IFLA_XDP_EXPECTED_FD]);
             }
 
             err = dev_change_xdp_fd(dev, extack,
                         nla_get_s32(xdp[IFLA_XDP_FD]),
                         expected_fd,
                         xdp_flags);
             if (err)
                 goto errout;
             status |= DO_SETLINK_NOTIFY;
         }
     }
 
 errout:
     if (status & DO_SETLINK_MODIFIED) {
         if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
             netdev_state_change(dev);
 
         if (err < 0)
             net_warn_ratelimited("A link change request failed with some changes committed already. Interface %s may have been left with an inconsistent configuration, please check.\n",
                          dev->name);
     }
 
     return err;
 }
 
 static struct net_device *rtnl_dev_get(struct net *net,
                        struct nlattr *tb[])
 {
     char ifname[ALTIFNAMSIZ];
 
     if (tb[IFLA_IFNAME])
         nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
     else if (tb[IFLA_ALT_IFNAME])
         nla_strscpy(ifname, tb[IFLA_ALT_IFNAME], ALTIFNAMSIZ);
     else
         return NULL;
 
     return __dev_get_by_name(net, ifname);
 }
 
 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
             struct netlink_ext_ack *extack)
 {
     struct net *net = sock_net(skb->sk);
     struct ifinfomsg *ifm;
     struct net_device *dev;
     int err;
     struct nlattr *tb[IFLA_MAX+1];
 
     err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
                      ifla_policy, extack);
     if (err < 0)
         goto errout;
 
     err = rtnl_ensure_unique_netns(tb, extack, false);
     if (err < 0)
         goto errout;
 
     err = -EINVAL;
     ifm = nlmsg_data(nlh);
     if (ifm->ifi_index > 0)
         dev = __dev_get_by_index(net, ifm->ifi_index);
     else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
         dev = rtnl_dev_get(net, tb);
     else
         goto errout;
 
     if (dev == NULL) {
         err = -ENODEV;
         goto errout;
     }
 
     err = do_setlink(skb, dev, ifm, extack, tb, 0);
 errout:
     return err;
 }
 
 static int rtnl_group_dellink(const struct net *net, int group)
 {
     struct net_device *dev, *aux;
     LIST_HEAD(list_kill);
     bool found = false;
 
     if (!group)
         return -EPERM;
 
     for_each_netdev(net, dev) {
         if (dev->group == group) {
             const struct rtnl_link_ops *ops;
 
             found = true;
             ops = dev->rtnl_link_ops;
             if (!ops || !ops->dellink)
                 return -EOPNOTSUPP;
         }
     }
 
     if (!found)
         return -ENODEV;
 
     for_each_netdev_safe(net, dev, aux) {
         if (dev->group == group) {
             const struct rtnl_link_ops *ops;
 
             ops = dev->rtnl_link_ops;
             ops->dellink(dev, &list_kill);
         }
     }
     unregister_netdevice_many(&list_kill);
 
     return 0;
 }
 
 int rtnl_delete_link(struct net_device *dev)
 {
     const struct rtnl_link_ops *ops;
     LIST_HEAD(list_kill);
 
     ops = dev->rtnl_link_ops;
     if (!ops || !ops->dellink)
         return -EOPNOTSUPP;
 
     ops->dellink(dev, &list_kill);
     unregister_netdevice_many(&list_kill);
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(rtnl_delete_link);
 
 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
             struct netlink_ext_ack *extack)
 {
     struct net *net = sock_net(skb->sk);
     struct net *tgt_net = net;
     struct net_device *dev = NULL;
     struct ifinfomsg *ifm;
     struct nlattr *tb[IFLA_MAX+1];
     int err;
     int netnsid = -1;
 
     err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
                      ifla_policy, extack);
     if (err < 0)
         return err;
 
     err = rtnl_ensure_unique_netns(tb, extack, true);
     if (err < 0)
         return err;
 
     if (tb[IFLA_TARGET_NETNSID]) {
         netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
         tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
         if (IS_ERR(tgt_net))
             return PTR_ERR(tgt_net);
     }
 
     err = -EINVAL;
     ifm = nlmsg_data(nlh);
     if (ifm->ifi_index > 0)
         dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
     else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
         dev = rtnl_dev_get(net, tb);
     else if (tb[IFLA_GROUP])
         err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
     else
         goto out;
 
     if (!dev) {
         if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME] || ifm->ifi_index > 0)
             err = -ENODEV;
 
         goto out;
     }
 
     err = rtnl_delete_link(dev);
 
 out:
     if (netnsid >= 0)
         put_net(tgt_net);
 
     return err;
 }
 
 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
 {
     unsigned int old_flags;
     int err;
 
     old_flags = dev->flags;
     if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
         err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
                      NULL);
         if (err < 0)
             return err;
     }
 
     if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
         __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags));
     } else {
         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
         __dev_notify_flags(dev, old_flags, ~0U);
     }
     return 0;
 }
 EXPORT_SYMBOL(rtnl_configure_link);
 
 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
                     unsigned char name_assign_type,
                     const struct rtnl_link_ops *ops,
                     struct nlattr *tb[],
                     struct netlink_ext_ack *extack)
 {
     struct net_device *dev;
     unsigned int num_tx_queues = 1;
     unsigned int num_rx_queues = 1;
 
     if (tb[IFLA_NUM_TX_QUEUES])
         num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
     else if (ops->get_num_tx_queues)
         num_tx_queues = ops->get_num_tx_queues();
 
     if (tb[IFLA_NUM_RX_QUEUES])
         num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
     else if (ops->get_num_rx_queues)
         num_rx_queues = ops->get_num_rx_queues();
 
     if (num_tx_queues < 1 || num_tx_queues > 4096) {
         NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
         return ERR_PTR(-EINVAL);
     }
 
     if (num_rx_queues < 1 || num_rx_queues > 4096) {
         NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
         return ERR_PTR(-EINVAL);
     }
 
     if (ops->alloc) {
         dev = ops->alloc(tb, ifname, name_assign_type,
                  num_tx_queues, num_rx_queues);
         if (IS_ERR(dev))
             return dev;
     } else {
         dev = alloc_netdev_mqs(ops->priv_size, ifname,
                        name_assign_type, ops->setup,
                        num_tx_queues, num_rx_queues);
     }
 
     if (!dev)
         return ERR_PTR(-ENOMEM);
 
     dev_net_set(dev, net);
     dev->rtnl_link_ops = ops;
     dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
 
     if (tb[IFLA_MTU]) {
         u32 mtu = nla_get_u32(tb[IFLA_MTU]);
         int err;
 
         err = dev_validate_mtu(dev, mtu, extack);
         if (err) {
             free_netdev(dev);
             return ERR_PTR(err);
         }
         dev->mtu = mtu;
     }
     if (tb[IFLA_ADDRESS]) {
         __dev_addr_set(dev, nla_data(tb[IFLA_ADDRESS]),
                    nla_len(tb[IFLA_ADDRESS]));
         dev->addr_assign_type = NET_ADDR_SET;
     }
     if (tb[IFLA_BROADCAST])
         memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
                 nla_len(tb[IFLA_BROADCAST]));
     if (tb[IFLA_TXQLEN])
         dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
     if (tb[IFLA_OPERSTATE])
         set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
     if (tb[IFLA_LINKMODE])
         dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
     if (tb[IFLA_GROUP])
         dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
     if (tb[IFLA_GSO_MAX_SIZE])
         netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
     if (tb[IFLA_GSO_MAX_SEGS])
         netif_set_gso_max_segs(dev, nla_get_u32(tb[IFLA_GSO_MAX_SEGS]));
     if (tb[IFLA_GRO_MAX_SIZE])
         netif_set_gro_max_size(dev, nla_get_u32(tb[IFLA_GRO_MAX_SIZE]));
 
     return dev;
 }
 EXPORT_SYMBOL(rtnl_create_link);
 
 static int rtnl_group_changelink(const struct sk_buff *skb,
         struct net *net, int group,
         struct ifinfomsg *ifm,
         struct netlink_ext_ack *extack,
         struct nlattr **tb)
 {
     struct net_device *dev, *aux;
     int err;
 
     for_each_netdev_safe(net, dev, aux) {
         if (dev->group == group) {
             err = do_setlink(skb, dev, ifm, extack, tb, 0);
             if (err < 0)
                 return err;
         }
     }
 
     return 0;
 }
 
 static int rtnl_newlink_create(struct sk_buff *skb, struct ifinfomsg *ifm,
                    const struct rtnl_link_ops *ops,
                    struct nlattr **tb, struct nlattr **data,
                    struct netlink_ext_ack *extack)
 {
     unsigned char name_assign_type = NET_NAME_USER;
     struct net *net = sock_net(skb->sk);
     struct net *dest_net, *link_net;
     struct net_device *dev;
     char ifname[IFNAMSIZ];
     int err;
 
     if (!ops->alloc && !ops->setup)
         return -EOPNOTSUPP;
 
     if (tb[IFLA_IFNAME]) {
         nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
     } else {
         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
         name_assign_type = NET_NAME_ENUM;
     }
 
     dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
     if (IS_ERR(dest_net))
         return PTR_ERR(dest_net);
 
     if (tb[IFLA_LINK_NETNSID]) {
         int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
 
         link_net = get_net_ns_by_id(dest_net, id);
         if (!link_net) {
             NL_SET_ERR_MSG(extack, "Unknown network namespace id");
             err =  -EINVAL;
             goto out;
         }
         err = -EPERM;
         if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
             goto out;
     } else {
         link_net = NULL;
     }
 
     dev = rtnl_create_link(link_net ? : dest_net, ifname,
                    name_assign_type, ops, tb, extack);
     if (IS_ERR(dev)) {
         err = PTR_ERR(dev);
         goto out;
     }
 
     dev->ifindex = ifm->ifi_index;
 
     if (ops->newlink)
         err = ops->newlink(link_net ? : net, dev, tb, data, extack);
     else
         err = register_netdevice(dev);
     if (err < 0) {
         free_netdev(dev);
         goto out;
     }
 
     err = rtnl_configure_link(dev, ifm);
     if (err < 0)
         goto out_unregister;
     if (link_net) {
         err = dev_change_net_namespace(dev, dest_net, ifname);
         if (err < 0)
             goto out_unregister;
     }
     if (tb[IFLA_MASTER]) {
         err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
         if (err)
             goto out_unregister;
     }
 out:
     if (link_net)
         put_net(link_net);
     put_net(dest_net);
     return err;
 out_unregister:
     if (ops->newlink) {
         LIST_HEAD(list_kill);
 
         ops->dellink(dev, &list_kill);
         unregister_netdevice_many(&list_kill);
     } else {
         unregister_netdevice(dev);
     }
     goto out;
 }
 
 struct rtnl_newlink_tbs {
     struct nlattr *tb[IFLA_MAX + 1];
     struct nlattr *attr[RTNL_MAX_TYPE + 1];
     struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
 };
 
 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
               struct rtnl_newlink_tbs *tbs,
               struct netlink_ext_ack *extack)
 {
     struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
     struct nlattr ** const tb = tbs->tb;
     const struct rtnl_link_ops *m_ops;
     struct net_device *master_dev;
     struct net *net = sock_net(skb->sk);
     const struct rtnl_link_ops *ops;
     struct nlattr **slave_data;
     char kind[MODULE_NAME_LEN];
     struct net_device *dev;
     struct ifinfomsg *ifm;
     struct nlattr **data;
     bool link_specified;
     int err;
 
 #ifdef CONFIG_MODULES
 replay:
 #endif
     err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
                      ifla_policy, extack);
     if (err < 0)
         return err;
 
     err = rtnl_ensure_unique_netns(tb, extack, false);
     if (err < 0)
         return err;
 
     ifm = nlmsg_data(nlh);
     if (ifm->ifi_index > 0) {
         link_specified = true;
         dev = __dev_get_by_index(net, ifm->ifi_index);
     } else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) {
         link_specified = true;
         dev = rtnl_dev_get(net, tb);
     } else {
         link_specified = false;
         dev = NULL;
     }
 
     master_dev = NULL;
     m_ops = NULL;
     if (dev) {
         master_dev = netdev_master_upper_dev_get(dev);
         if (master_dev)
             m_ops = master_dev->rtnl_link_ops;
     }
 
     err = validate_linkmsg(dev, tb, extack);
     if (err < 0)
         return err;
 
     if (tb[IFLA_LINKINFO]) {
         err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
                           tb[IFLA_LINKINFO],
                           ifla_info_policy, NULL);
         if (err < 0)
             return err;
     } else
         memset(linkinfo, 0, sizeof(linkinfo));
 
     if (linkinfo[IFLA_INFO_KIND]) {
         nla_strscpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
         ops = rtnl_link_ops_get(kind);
     } else {
         kind[0] = '\0';
         ops = NULL;
     }
 
     data = NULL;
     if (ops) {
         if (ops->maxtype > RTNL_MAX_TYPE)
             return -EINVAL;
 
         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
             err = nla_parse_nested_deprecated(tbs->attr, ops->maxtype,
                               linkinfo[IFLA_INFO_DATA],
                               ops->policy, extack);
             if (err < 0)
                 return err;
             data = tbs->attr;
         }
         if (ops->validate) {
             err = ops->validate(tb, data, extack);
             if (err < 0)
                 return err;
         }
     }
 
     slave_data = NULL;
     if (m_ops) {
         if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
             return -EINVAL;
 
         if (m_ops->slave_maxtype &&
             linkinfo[IFLA_INFO_SLAVE_DATA]) {
             err = nla_parse_nested_deprecated(tbs->slave_attr,
                               m_ops->slave_maxtype,
                               linkinfo[IFLA_INFO_SLAVE_DATA],
                               m_ops->slave_policy,
                               extack);
             if (err < 0)
                 return err;
             slave_data = tbs->slave_attr;
         }
     }
 
     if (dev) {
         int status = 0;
 
         if (nlh->nlmsg_flags & NLM_F_EXCL)
             return -EEXIST;
         if (nlh->nlmsg_flags & NLM_F_REPLACE)
             return -EOPNOTSUPP;
 
         if (linkinfo[IFLA_INFO_DATA]) {
             if (!ops || ops != dev->rtnl_link_ops ||
                 !ops->changelink)
                 return -EOPNOTSUPP;
 
             err = ops->changelink(dev, tb, data, extack);
             if (err < 0)
                 return err;
             status |= DO_SETLINK_NOTIFY;
         }
 
         if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
             if (!m_ops || !m_ops->slave_changelink)
                 return -EOPNOTSUPP;
 
             err = m_ops->slave_changelink(master_dev, dev, tb,
                               slave_data, extack);
             if (err < 0)
                 return err;
             status |= DO_SETLINK_NOTIFY;
         }
 
         return do_setlink(skb, dev, ifm, extack, tb, status);
     }
 
     if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
         /* No dev found and NLM_F_CREATE not set. Requested dev does not exist,
          * or it's for a group
         */
         if (link_specified)
             return -ENODEV;
         if (tb[IFLA_GROUP])
             return rtnl_group_changelink(skb, net,
                         nla_get_u32(tb[IFLA_GROUP]),
                         ifm, extack, tb);
         return -ENODEV;
     }
 
     if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
         return -EOPNOTSUPP;
 
     if (!ops) {
 #ifdef CONFIG_MODULES
         if (kind[0]) {
             __rtnl_unlock();
             request_module("rtnl-link-%s", kind);
             rtnl_lock();
             ops = rtnl_link_ops_get(kind);
             if (ops)
                 goto replay;
         }
 #endif
         NL_SET_ERR_MSG(extack, "Unknown device type");
         return -EOPNOTSUPP;
     }
 
     return rtnl_newlink_create(skb, ifm, ops, tb, data, extack);
 }
 
 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
             struct netlink_ext_ack *extack)
 {
     struct rtnl_newlink_tbs *tbs;
     int ret;
 
     tbs = kmalloc(sizeof(*tbs), GFP_KERNEL);
     if (!tbs)
         return -ENOMEM;
 
     ret = __rtnl_newlink(skb, nlh, tbs, extack);
     kfree(tbs);
     return ret;
 }
 
 static int rtnl_valid_getlink_req(struct sk_buff *skb,
                   const struct nlmsghdr *nlh,
                   struct nlattr **tb,
                   struct netlink_ext_ack *extack)
 {
     struct ifinfomsg *ifm;
     int i, err;
 
     if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
         NL_SET_ERR_MSG(extack, "Invalid header for get link");
         return -EINVAL;
     }
 
     if (!netlink_strict_get_check(skb))
         return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
                           ifla_policy, extack);
 
     ifm = nlmsg_data(nlh);
     if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
         ifm->ifi_change) {
         NL_SET_ERR_MSG(extack, "Invalid values in header for get link request");
         return -EINVAL;
     }
 
     err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
                         ifla_policy, extack);
     if (err)
         return err;
 
     for (i = 0; i <= IFLA_MAX; i++) {
         if (!tb[i])
             continue;
 
         switch (i) {
         case IFLA_IFNAME:
         case IFLA_ALT_IFNAME:
         case IFLA_EXT_MASK:
         case IFLA_TARGET_NETNSID:
             break;
         default:
             NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request");
             return -EINVAL;
         }
     }
 
     return 0;
 }
 
 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
             struct netlink_ext_ack *extack)
 {
     struct net *net = sock_net(skb->sk);
     struct net *tgt_net = net;
     struct ifinfomsg *ifm;
     struct nlattr *tb[IFLA_MAX+1];
     struct net_device *dev = NULL;
     struct sk_buff *nskb;
     int netnsid = -1;
     int err;
     u32 ext_filter_mask = 0;
 
     err = rtnl_valid_getlink_req(skb, nlh, tb, extack);
     if (err < 0)
         return err;
 
     err = rtnl_ensure_unique_netns(tb, extack, true);
     if (err < 0)
         return err;
 
     if (tb[IFLA_TARGET_NETNSID]) {
         netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
         tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
         if (IS_ERR(tgt_net))
             return PTR_ERR(tgt_net);
     }
 
     if (tb[IFLA_EXT_MASK])
         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
 
     err = -EINVAL;
     ifm = nlmsg_data(nlh);
     if (ifm->ifi_index > 0)
         dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
     else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
         dev = rtnl_dev_get(tgt_net, tb);
     else
         goto out;
 
     err = -ENODEV;
     if (dev == NULL)
         goto out;
 
     err = -ENOBUFS;
     nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
     if (nskb == NULL)
         goto out;
 
     err = rtnl_fill_ifinfo(nskb, dev, net,
                    RTM_NEWLINK, NETLINK_CB(skb).portid,
                    nlh->nlmsg_seq, 0, 0, ext_filter_mask,
                    0, NULL, 0, netnsid, GFP_KERNEL);
     if (err < 0) {
         /* -EMSGSIZE implies BUG in if_nlmsg_size */
         WARN_ON(err == -EMSGSIZE);
         kfree_skb(nskb);
     } else
         err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
 out:
     if (netnsid >= 0)
         put_net(tgt_net);
 
     return err;
 }
 
 static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr,
                bool *changed, struct netlink_ext_ack *extack)
 {
     char *alt_ifname;
     size_t size;
     int err;
 
     err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack);
     if (err)
         return err;
 
     if (cmd == RTM_NEWLINKPROP) {
         size = rtnl_prop_list_size(dev);
         size += nla_total_size(ALTIFNAMSIZ);
         if (size >= U16_MAX) {
             NL_SET_ERR_MSG(extack,
                        "effective property list too long");
             return -EINVAL;
         }
     }
 
     alt_ifname = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
     if (!alt_ifname)
         return -ENOMEM;
 
     if (cmd == RTM_NEWLINKPROP) {
         err = netdev_name_node_alt_create(dev, alt_ifname);
         if (!err)
             alt_ifname = NULL;
     } else if (cmd == RTM_DELLINKPROP) {
         err = netdev_name_node_alt_destroy(dev, alt_ifname);
     } else {
         WARN_ON_ONCE(1);
         err = -EINVAL;
     }
 
     kfree(alt_ifname);
     if (!err)
         *changed = true;
     return err;
 }
 
 static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
              struct netlink_ext_ack *extack)
 {
     struct net *net = sock_net(skb->sk);
     struct nlattr *tb[IFLA_MAX + 1];
     struct net_device *dev;
     struct ifinfomsg *ifm;
     bool changed = false;
     struct nlattr *attr;
     int err, rem;
 
     err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
     if (err)
         return err;
 
     err = rtnl_ensure_unique_netns(tb, extack, true);
     if (err)
         return err;
 
     ifm = nlmsg_data(nlh);
     if (ifm->ifi_index > 0)
         dev = __dev_get_by_index(net, ifm->ifi_index);
     else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
         dev = rtnl_dev_get(net, tb);
     else
         return -EINVAL;
 
     if (!dev)
         return -ENODEV;
 
     if (!tb[IFLA_PROP_LIST])
         return 0;
 
     nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) {
         switch (nla_type(attr)) {
         case IFLA_ALT_IFNAME:
             err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack);
             if (err)
                 return err;
             break;
         }
     }
 
     if (changed)
         netdev_state_change(dev);
     return 0;
 }
 
 static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
                 struct netlink_ext_ack *extack)
 {
     return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack);
 }
 
 static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
                 struct netlink_ext_ack *extack)
 {
     return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack);
 }
 
 static u32 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
 {
     struct net *net = sock_net(skb->sk);
     size_t min_ifinfo_dump_size = 0;
     struct nlattr *tb[IFLA_MAX+1];
     u32 ext_filter_mask = 0;
     struct net_device *dev;
     int hdrlen;
 
     /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
     hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
          sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
 
     if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
         if (tb[IFLA_EXT_MASK])
             ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
     }
 
     if (!ext_filter_mask)
         return NLMSG_GOODSIZE;
     /*
      * traverse the list of net devices and compute the minimum
      * buffer size based upon the filter mask.
      */
     rcu_read_lock();
     for_each_netdev_rcu(net, dev) {
         min_ifinfo_dump_size = max(min_ifinfo_dump_size,
                        if_nlmsg_size(dev, ext_filter_mask));
     }
     rcu_read_unlock();
 
     return nlmsg_total_size(min_ifinfo_dump_size);
 }
 
 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 {
     int idx;
     int s_idx = cb->family;
     int type = cb->nlh->nlmsg_type - RTM_BASE;
     int ret = 0;
 
     if (s_idx == 0)
         s_idx = 1;
 
     for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
         struct rtnl_link __rcu **tab;
         struct rtnl_link *link;
         rtnl_dumpit_func dumpit;
 
         if (idx < s_idx || idx == PF_PACKET)
             continue;
 
         if (type < 0 || type >= RTM_NR_MSGTYPES)
             continue;
 
         tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
         if (!tab)
             continue;
 
         link = rcu_dereference_rtnl(tab[type]);
         if (!link)
             continue;
 
         dumpit = link->dumpit;
         if (!dumpit)
             continue;
 
         if (idx > s_idx) {
             memset(&cb->args[0], 0, sizeof(cb->args));
             cb->prev_seq = 0;
             cb->seq = 0;
         }
         ret = dumpit(skb, cb);
         if (ret)
             break;
     }
     cb->family = idx;
 
     return skb->len ? : ret;
 }
 
 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
                        unsigned int change,
                        u32 event, gfp_t flags, int *new_nsid,
                        int new_ifindex)
 {
     struct net *net = dev_net(dev);
     struct sk_buff *skb;
     int err = -ENOBUFS;
 
     skb = nlmsg_new(if_nlmsg_size(dev, 0), flags);
     if (skb == NULL)
         goto errout;
 
     err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
                    type, 0, 0, change, 0, 0, event,
                    new_nsid, new_ifindex, -1, flags);
     if (err < 0) {
         /* -EMSGSIZE implies BUG in if_nlmsg_size() */
         WARN_ON(err == -EMSGSIZE);
         kfree_skb(skb);
         goto errout;
     }
     return skb;
 errout:
     if (err < 0)
         rtnl_set_sk_err(net, RTNLGRP_LINK, err);
     return NULL;
 }
 
 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
 {
     struct net *net = dev_net(dev);
 
     rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
 }
 
 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
                    unsigned int change, u32 event,
                    gfp_t flags, int *new_nsid, int new_ifindex)
 {
     struct sk_buff *skb;
 
     if (dev->reg_state != NETREG_REGISTERED)
         return;
 
     skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
                      new_ifindex);
     if (skb)
         rtmsg_ifinfo_send(skb, dev, flags);
 }
 
 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
           gfp_t flags)
 {
     rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
                NULL, 0);
 }
 
 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
              gfp_t flags, int *new_nsid, int new_ifindex)
 {
     rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
                new_nsid, new_ifindex);
 }
 
 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
                    struct net_device *dev,
                    u8 *addr, u16 vid, u32 pid, u32 seq,
                    int type, unsigned int flags,
                    int nlflags, u16 ndm_state)
 {
     struct nlmsghdr *nlh;
     struct ndmsg *ndm;
 
     nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
     if (!nlh)
         return -EMSGSIZE;
 
     ndm = nlmsg_data(nlh);
     ndm->ndm_family  = AF_BRIDGE;
     ndm->ndm_pad1    = 0;
     ndm->ndm_pad2    = 0;
     ndm->ndm_flags   = flags;
     ndm->ndm_type    = 0;
     ndm->ndm_ifindex = dev->ifindex;
     ndm->ndm_state   = ndm_state;
 
     if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
         goto nla_put_failure;
     if (vid)
         if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
             goto nla_put_failure;
 
     nlmsg_end(skb, nlh);
     return 0;
 
 nla_put_failure:
     nlmsg_cancel(skb, nlh);
     return -EMSGSIZE;
 }
 
 static inline size_t rtnl_fdb_nlmsg_size(void)
 {
     return NLMSG_ALIGN(sizeof(struct ndmsg)) +
            nla_total_size(ETH_ALEN) +   /* NDA_LLADDR */
            nla_total_size(sizeof(u16)) +    /* NDA_VLAN */
            0;
 }
 
 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
                 u16 ndm_state)
 {
     struct net *net = dev_net(dev);
     struct sk_buff *skb;
     int err = -ENOBUFS;
 
     skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
     if (!skb)
         goto errout;
 
     err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
                       0, 0, type, NTF_SELF, 0, ndm_state);
     if (err < 0) {
         kfree_skb(skb);
         goto errout;
     }
 
     rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
     return;
 errout:
     rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 }
 
 /*
  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
  */
 int ndo_dflt_fdb_add(struct ndmsg *ndm,
              struct nlattr *tb[],
              struct net_device *dev,
              const unsigned char *addr, u16 vid,
              u16 flags)
 {
     int err = -EINVAL;
 
     /* If aging addresses are supported device will need to
      * implement its own handler for this.
      */
     if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
         netdev_info(dev, "default FDB implementation only supports local addresses\n");
         return err;
     }
 
     if (vid) {
         netdev_info(dev, "vlans aren't supported yet for dev_uc|mc_add()\n");
         return err;
     }
 
     if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
         err = dev_uc_add_excl(dev, addr);
     else if (is_multicast_ether_addr(addr))
         err = dev_mc_add_excl(dev, addr);
 
     /* Only return duplicate errors if NLM_F_EXCL is set */
     if (err == -EEXIST && !(flags & NLM_F_EXCL))
         err = 0;
 
     return err;
 }
 EXPORT_SYMBOL(ndo_dflt_fdb_add);
 
 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
              struct netlink_ext_ack *extack)
 {
     u16 vid = 0;
 
     if (vlan_attr) {
         if (nla_len(vlan_attr) != sizeof(u16)) {
             NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
             return -EINVAL;
         }
 
         vid = nla_get_u16(vlan_attr);
 
         if (!vid || vid >= VLAN_VID_MASK) {
             NL_SET_ERR_MSG(extack, "invalid vlan id");
             return -EINVAL;
         }
     }
     *p_vid = vid;
     return 0;
 }
 
 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
             struct netlink_ext_ack *extack)
 {
     struct net *net = sock_net(skb->sk);
     struct ndmsg *ndm;
     struct nlattr *tb[NDA_MAX+1];
     struct net_device *dev;
     u8 *addr;
     u16 vid;
     int err;
 
     err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
                      extack);
     if (err < 0)
         return err;
 
     ndm = nlmsg_data(nlh);
     if (ndm->ndm_ifindex == 0) {
         NL_SET_ERR_MSG(extack, "invalid ifindex");
         return -EINVAL;
     }
 
     dev = __dev_get_by_index(net, ndm->ndm_ifindex);
     if (dev == NULL) {
         NL_SET_ERR_MSG(extack, "unknown ifindex");
         return -ENODEV;
     }
 
     if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
         NL_SET_ERR_MSG(extack, "invalid address");
         return -EINVAL;
     }
 
     if (dev->type != ARPHRD_ETHER) {
         NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
         return -EINVAL;
     }
 
     addr = nla_data(tb[NDA_LLADDR]);
 
     err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
     if (err)
         return err;
 
     err = -EOPNOTSUPP;
 
     /* Support fdb on master device the net/bridge default case */
     if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
         netif_is_bridge_port(dev)) {
         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
         const struct net_device_ops *ops = br_dev->netdev_ops;
 
         err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
                        nlh->nlmsg_flags, extack);
         if (err)
             goto out;
         else
             ndm->ndm_flags &= ~NTF_MASTER;
     }
 
     /* Embedded bridge, macvlan, and any other device support */
     if ((ndm->ndm_flags & NTF_SELF)) {
         if (dev->netdev_ops->ndo_fdb_add)
             err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
                                vid,
                                nlh->nlmsg_flags,
                                extack);
         else
             err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
                            nlh->nlmsg_flags);
 
         if (!err) {
             rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
                     ndm->ndm_state);
             ndm->ndm_flags &= ~NTF_SELF;
         }
     }
 out:
     return err;
 }
 
 /*
  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
  */
 int ndo_dflt_fdb_del(struct ndmsg *ndm,
              struct nlattr *tb[],
              struct net_device *dev,
              const unsigned char *addr, u16 vid)
 {
     int err = -EINVAL;
 
     /* If aging addresses are supported device will need to
      * implement its own handler for this.
      */
     if (!(ndm->ndm_state & NUD_PERMANENT)) {
         netdev_info(dev, "default FDB implementation only supports local addresses\n");
         return err;
     }
 
     if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
         err = dev_uc_del(dev, addr);
     else if (is_multicast_ether_addr(addr))
         err = dev_mc_del(dev, addr);
 
     return err;
 }
 EXPORT_SYMBOL(ndo_dflt_fdb_del);
 
 static const struct nla_policy fdb_del_bulk_policy[NDA_MAX + 1] = {
     [NDA_VLAN]  = { .type = NLA_U16 },
     [NDA_IFINDEX]   = NLA_POLICY_MIN(NLA_S32, 1),
     [NDA_NDM_STATE_MASK]    = { .type = NLA_U16  },
     [NDA_NDM_FLAGS_MASK]    = { .type = NLA_U8 },
 };
 
 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
             struct netlink_ext_ack *extack)
 {
     bool del_bulk = !!(nlh->nlmsg_flags & NLM_F_BULK);
     struct net *net = sock_net(skb->sk);
     const struct net_device_ops *ops;
     struct ndmsg *ndm;
     struct nlattr *tb[NDA_MAX+1];
     struct net_device *dev;
     __u8 *addr = NULL;
     int err;
     u16 vid;
 
     if (!netlink_capable(skb, CAP_NET_ADMIN))
         return -EPERM;
 
     if (!del_bulk) {
         err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX,
                          NULL, extack);
     } else {
         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX,
                   fdb_del_bulk_policy, extack);
     }
     if (err < 0)
         return err;
 
     ndm = nlmsg_data(nlh);
     if (ndm->ndm_ifindex == 0) {
         NL_SET_ERR_MSG(extack, "invalid ifindex");
         return -EINVAL;
     }
 
     dev = __dev_get_by_index(net, ndm->ndm_ifindex);
     if (dev == NULL) {
         NL_SET_ERR_MSG(extack, "unknown ifindex");
         return -ENODEV;
     }
 
     if (!del_bulk) {
         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
             NL_SET_ERR_MSG(extack, "invalid address");
             return -EINVAL;
         }
         addr = nla_data(tb[NDA_LLADDR]);
     }
 
     if (dev->type != ARPHRD_ETHER) {
         NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
         return -EINVAL;
     }
 
     err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
     if (err)
         return err;
 
     err = -EOPNOTSUPP;
 
     /* Support fdb on master device the net/bridge default case */
     if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
         netif_is_bridge_port(dev)) {
         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
 
         ops = br_dev->netdev_ops;
         if (!del_bulk) {
             if (ops->ndo_fdb_del)
                 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid, extack);
         } else {
             if (ops->ndo_fdb_del_bulk)
                 err = ops->ndo_fdb_del_bulk(ndm, tb, dev, vid,
                                 extack);
         }
 
         if (err)
             goto out;
         else
             ndm->ndm_flags &= ~NTF_MASTER;
     }
 
     /* Embedded bridge, macvlan, and any other device support */
     if (ndm->ndm_flags & NTF_SELF) {
         ops = dev->netdev_ops;
         if (!del_bulk) {
             if (ops->ndo_fdb_del)
                 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid, extack);
             else
                 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
         } else {
             /* in case err was cleared by NTF_MASTER call */
             err = -EOPNOTSUPP;
             if (ops->ndo_fdb_del_bulk)
                 err = ops->ndo_fdb_del_bulk(ndm, tb, dev, vid,
                                 extack);
         }
 
         if (!err) {
             if (!del_bulk)
                 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
                         ndm->ndm_state);
             ndm->ndm_flags &= ~NTF_SELF;
         }
     }
 out:
     return err;
 }
 
 static int nlmsg_populate_fdb(struct sk_buff *skb,
                   struct netlink_callback *cb,
                   struct net_device *dev,
                   int *idx,
                   struct netdev_hw_addr_list *list)
 {
     struct netdev_hw_addr *ha;
     int err;
     u32 portid, seq;
 
     portid = NETLINK_CB(cb->skb).portid;
     seq = cb->nlh->nlmsg_seq;
 
     list_for_each_entry(ha, &list->list, list) {
         if (*idx < cb->args[2])
             goto skip;
 
         err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
                           portid, seq,
                           RTM_NEWNEIGH, NTF_SELF,
                           NLM_F_MULTI, NUD_PERMANENT);
         if (err < 0)
             return err;
 skip:
         *idx += 1;
     }
     return 0;
 }
 
 /**
  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
  * @skb: socket buffer to store message in
  * @cb: netlink callback
  * @dev: netdevice
  * @filter_dev: ignored
  * @idx: the number of FDB table entries dumped is added to *@idx
  *
  * Default netdevice operation to dump the existing unicast address list.
  * Returns number of addresses from list put in skb.
  */
 int ndo_dflt_fdb_dump(struct sk_buff *skb,
               struct netlink_callback *cb,
               struct net_device *dev,
               struct net_device *filter_dev,
               int *idx)
 {
     int err;
 
     if (dev->type != ARPHRD_ETHER)
         return -EINVAL;
 
     netif_addr_lock_bh(dev);
     err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
     if (err)
         goto out;
     err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
 out:
     netif_addr_unlock_bh(dev);
     return err;
 }
 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
 
 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
                  int *br_idx, int *brport_idx,
                  struct netlink_ext_ack *extack)
 {
     struct nlattr *tb[NDA_MAX + 1];
     struct ndmsg *ndm;
     int err, i;
 
     if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
         NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
         return -EINVAL;
     }
 
     ndm = nlmsg_data(nlh);
     if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
         ndm->ndm_flags || ndm->ndm_type) {
         NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request");
         return -EINVAL;
     }
 
     err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
                         NDA_MAX, NULL, extack);
     if (err < 0)
         return err;
 
     *brport_idx = ndm->ndm_ifindex;
     for (i = 0; i <= NDA_MAX; ++i) {
         if (!tb[i])
             continue;
 
         switch (i) {
         case NDA_IFINDEX:
             if (nla_len(tb[i]) != sizeof(u32)) {
                 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
                 return -EINVAL;
             }
             *brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
             break;
         case NDA_MASTER:
             if (nla_len(tb[i]) != sizeof(u32)) {
                 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
                 return -EINVAL;
             }
             *br_idx = nla_get_u32(tb[NDA_MASTER]);
             break;
         default:
             NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
             return -EINVAL;
         }
     }
 
     return 0;
 }
 
 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
                  int *br_idx, int *brport_idx,
                  struct netlink_ext_ack *extack)
 {
     struct nlattr *tb[IFLA_MAX+1];
     int err;
 
     /* A hack to preserve kernel<->userspace interface.
      * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
      * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
      * So, check for ndmsg with an optional u32 attribute (not used here).
      * Fortunately these sizes don't conflict with the size of ifinfomsg
      * with an optional attribute.
      */
     if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
         (nlmsg_len(nlh) != sizeof(struct ndmsg) +
          nla_attr_size(sizeof(u32)))) {
         struct ifinfomsg *ifm;
 
         err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
                          tb, IFLA_MAX, ifla_policy,
                          extack);
         if (err < 0) {
             return -EINVAL;
         } else if (err == 0) {
             if (tb[IFLA_MASTER])
                 *br_idx = nla_get_u32(tb[IFLA_MASTER]);
         }
 
         ifm = nlmsg_data(nlh);
         *brport_idx = ifm->ifi_index;
     }
     return 0;
 }
 
 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
 {
     struct net_device *dev;
     struct net_device *br_dev = NULL;
     const struct net_device_ops *ops = NULL;
     const struct net_device_ops *cops = NULL;
     struct net *net = sock_net(skb->sk);
     struct hlist_head *head;
     int brport_idx = 0;
     int br_idx = 0;
     int h, s_h;
     int idx = 0, s_idx;
     int err = 0;
     int fidx = 0;
 
     if (cb->strict_check)
         err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
                         cb->extack);
     else
         err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
                         cb->extack);
     if (err < 0)
         return err;
 
     if (br_idx) {
         br_dev = __dev_get_by_index(net, br_idx);
         if (!br_dev)
             return -ENODEV;
 
         ops = br_dev->netdev_ops;
     }
 
     s_h = cb->args[0];
     s_idx = cb->args[1];
 
     for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
         idx = 0;
         head = &net->dev_index_head[h];
         hlist_for_each_entry(dev, head, index_hlist) {
 
             if (brport_idx && (dev->ifindex != brport_idx))
                 continue;
 
             if (!br_idx) { /* user did not specify a specific bridge */
                 if (netif_is_bridge_port(dev)) {
                     br_dev = netdev_master_upper_dev_get(dev);
                     cops = br_dev->netdev_ops;
                 }
             } else {
                 if (dev != br_dev &&
                     !netif_is_bridge_port(dev))
                     continue;
 
                 if (br_dev != netdev_master_upper_dev_get(dev) &&
                     !netif_is_bridge_master(dev))
                     continue;
                 cops = ops;
             }
 
             if (idx < s_idx)
                 goto cont;
 
             if (netif_is_bridge_port(dev)) {
                 if (cops && cops->ndo_fdb_dump) {
                     err = cops->ndo_fdb_dump(skb, cb,
                                 br_dev, dev,
                                 &fidx);
                     if (err == -EMSGSIZE)
                         goto out;
                 }
             }
 
             if (dev->netdev_ops->ndo_fdb_dump)
                 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
                                     dev, NULL,
                                     &fidx);
             else
                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
                             &fidx);
             if (err == -EMSGSIZE)
                 goto out;
 
             cops = NULL;
 
             /* reset fdb offset to 0 for rest of the interfaces */
             cb->args[2] = 0;
             fidx = 0;
 cont:
             idx++;
         }
     }
 
 out:
     cb->args[0] = h;
     cb->args[1] = idx;
     cb->args[2] = fidx;
 
     return skb->len;
 }
 
 static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
                 struct nlattr **tb, u8 *ndm_flags,
                 int *br_idx, int *brport_idx, u8 **addr,
                 u16 *vid, struct netlink_ext_ack *extack)
 {
     struct ndmsg *ndm;
     int err, i;
 
     if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
         NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
         return -EINVAL;
     }
 
     ndm = nlmsg_data(nlh);
     if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
         ndm->ndm_type) {
         NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
         return -EINVAL;
     }
 
     if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
         NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
         return -EINVAL;
     }
 
     err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
                         NDA_MAX, nda_policy, extack);
     if (err < 0)
         return err;
 
     *ndm_flags = ndm->ndm_flags;
     *brport_idx = ndm->ndm_ifindex;
     for (i = 0; i <= NDA_MAX; ++i) {
         if (!tb[i])
             continue;
 
         switch (i) {
         case NDA_MASTER:
             *br_idx = nla_get_u32(tb[i]);
             break;
         case NDA_LLADDR:
             if (nla_len(tb[i]) != ETH_ALEN) {
                 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
                 return -EINVAL;
             }
             *addr = nla_data(tb[i]);
             break;
         case NDA_VLAN:
             err = fdb_vid_parse(tb[i], vid, extack);
             if (err)
                 return err;
             break;
         case NDA_VNI:
             break;
         default:
             NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
             return -EINVAL;
         }
     }
 
     return 0;
 }
 
 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
             struct netlink_ext_ack *extack)
 {
     struct net_device *dev = NULL, *br_dev = NULL;
     const struct net_device_ops *ops = NULL;
     struct net *net = sock_net(in_skb->sk);
     struct nlattr *tb[NDA_MAX + 1];
     struct sk_buff *skb;
     int brport_idx = 0;
     u8 ndm_flags = 0;
     int br_idx = 0;
     u8 *addr = NULL;
     u16 vid = 0;
     int err;
 
     err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
                    &brport_idx, &addr, &vid, extack);
     if (err < 0)
         return err;
 
     if (!addr) {
         NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
         return -EINVAL;
     }
 
     if (brport_idx) {
         dev = __dev_get_by_index(net, brport_idx);
         if (!dev) {
             NL_SET_ERR_MSG(extack, "Unknown device ifindex");
             return -ENODEV;
         }
     }
 
     if (br_idx) {
         if (dev) {
             NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
             return -EINVAL;
         }
 
         br_dev = __dev_get_by_index(net, br_idx);
         if (!br_dev) {
             NL_SET_ERR_MSG(extack, "Invalid master ifindex");
             return -EINVAL;
         }
         ops = br_dev->netdev_ops;
     }
 
     if (dev) {
         if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
             if (!netif_is_bridge_port(dev)) {
                 NL_SET_ERR_MSG(extack, "Device is not a bridge port");
                 return -EINVAL;
             }
             br_dev = netdev_master_upper_dev_get(dev);
             if (!br_dev) {
                 NL_SET_ERR_MSG(extack, "Master of device not found");
                 return -EINVAL;
             }
             ops = br_dev->netdev_ops;
         } else {
             if (!(ndm_flags & NTF_SELF)) {
                 NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
                 return -EINVAL;
             }
             ops = dev->netdev_ops;
         }
     }
 
     if (!br_dev && !dev) {
         NL_SET_ERR_MSG(extack, "No device specified");
         return -ENODEV;
     }
 
     if (!ops || !ops->ndo_fdb_get) {
         NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
         return -EOPNOTSUPP;
     }
 
     skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
     if (!skb)
         return -ENOBUFS;
 
     if (br_dev)
         dev = br_dev;
     err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
                    NETLINK_CB(in_skb).portid,
                    nlh->nlmsg_seq, extack);
     if (err)
         goto out;
 
     return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 out:
     kfree_skb(skb);
     return err;
 }
 
 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
                    unsigned int attrnum, unsigned int flag)
 {
     if (mask & flag)
         return nla_put_u8(skb, attrnum, !!(flags & flag));
     return 0;
 }
 
 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
                 struct net_device *dev, u16 mode,
                 u32 flags, u32 mask, int nlflags,
                 u32 filter_mask,
                 int (*vlan_fill)(struct sk_buff *skb,
                          struct net_device *dev,
                          u32 filter_mask))
 {
     struct nlmsghdr *nlh;
     struct ifinfomsg *ifm;
     struct nlattr *br_afspec;
     struct nlattr *protinfo;
     u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
     struct net_device *br_dev = netdev_master_upper_dev_get(dev);
     int err = 0;
 
     nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
     if (nlh == NULL)
         return -EMSGSIZE;
 
     ifm = nlmsg_data(nlh);
     ifm->ifi_family = AF_BRIDGE;
     ifm->__ifi_pad = 0;
     ifm->ifi_type = dev->type;
     ifm->ifi_index = dev->ifindex;
     ifm->ifi_flags = dev_get_flags(dev);
     ifm->ifi_change = 0;
 
 
     if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
         nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
         nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
         (br_dev &&
          nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
         (dev->addr_len &&
          nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
         (dev->ifindex != dev_get_iflink(dev) &&
          nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
         goto nla_put_failure;
 
     br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
     if (!br_afspec)
         goto nla_put_failure;
 
     if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
         nla_nest_cancel(skb, br_afspec);
         goto nla_put_failure;
     }
 
     if (mode != BRIDGE_MODE_UNDEF) {
         if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
             nla_nest_cancel(skb, br_afspec);
             goto nla_put_failure;
         }
     }
     if (vlan_fill) {
         err = vlan_fill(skb, dev, filter_mask);
         if (err) {
             nla_nest_cancel(skb, br_afspec);
             goto nla_put_failure;
         }
     }
     nla_nest_end(skb, br_afspec);
 
     protinfo = nla_nest_start(skb, IFLA_PROTINFO);
     if (!protinfo)
         goto nla_put_failure;
 
     if (brport_nla_put_flag(skb, flags, mask,
                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
         brport_nla_put_flag(skb, flags, mask,
                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
         brport_nla_put_flag(skb, flags, mask,
                 IFLA_BRPORT_FAST_LEAVE,
                 BR_MULTICAST_FAST_LEAVE) ||
         brport_nla_put_flag(skb, flags, mask,
                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
         brport_nla_put_flag(skb, flags, mask,
                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
         brport_nla_put_flag(skb, flags, mask,
                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
         brport_nla_put_flag(skb, flags, mask,
                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
         brport_nla_put_flag(skb, flags, mask,
                 IFLA_BRPORT_PROXYARP, BR_PROXYARP) ||
         brport_nla_put_flag(skb, flags, mask,
                 IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD) ||
         brport_nla_put_flag(skb, flags, mask,
                 IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD)) {
         nla_nest_cancel(skb, protinfo);
         goto nla_put_failure;
     }
 
     nla_nest_end(skb, protinfo);
 
     nlmsg_end(skb, nlh);
     return 0;
 nla_put_failure:
     nlmsg_cancel(skb, nlh);
     return err ? err : -EMSGSIZE;
 }
 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
 
 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
                     bool strict_check, u32 *filter_mask,
                     struct netlink_ext_ack *extack)
 {
     struct nlattr *tb[IFLA_MAX+1];
     int err, i;
 
     if (strict_check) {
         struct ifinfomsg *ifm;
 
         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
             NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
             return -EINVAL;
         }
 
         ifm = nlmsg_data(nlh);
         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
             ifm->ifi_change || ifm->ifi_index) {
             NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
             return -EINVAL;
         }
 
         err = nlmsg_parse_deprecated_strict(nlh,
                             sizeof(struct ifinfomsg),
                             tb, IFLA_MAX, ifla_policy,
                             extack);
     } else {
         err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
                          tb, IFLA_MAX, ifla_policy,
                          extack);
     }
     if (err < 0)
         return err;
 
     /* new attributes should only be added with strict checking */
     for (i = 0; i <= IFLA_MAX; ++i) {
         if (!tb[i])
             continue;
 
         switch (i) {
         case IFLA_EXT_MASK:
             *filter_mask = nla_get_u32(tb[i]);
             break;
         default:
             if (strict_check) {
                 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
                 return -EINVAL;
             }
         }
     }
 
     return 0;
 }
 
 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
 {
     const struct nlmsghdr *nlh = cb->nlh;
     struct net *net = sock_net(skb->sk);
     struct net_device *dev;
     int idx = 0;
     u32 portid = NETLINK_CB(cb->skb).portid;
     u32 seq = nlh->nlmsg_seq;
     u32 filter_mask = 0;
     int err;
 
     err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
                        cb->extack);
     if (err < 0 && cb->strict_check)
         return err;
 
     rcu_read_lock();
     for_each_netdev_rcu(net, dev) {
         const struct net_device_ops *ops = dev->netdev_ops;
         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
 
         if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
             if (idx >= cb->args[0]) {
                 err = br_dev->netdev_ops->ndo_bridge_getlink(
                         skb, portid, seq, dev,
                         filter_mask, NLM_F_MULTI);
                 if (err < 0 && err != -EOPNOTSUPP) {
                     if (likely(skb->len))
                         break;
 
                     goto out_err;
                 }
             }
             idx++;
         }
 
         if (ops->ndo_bridge_getlink) {
             if (idx >= cb->args[0]) {
                 err = ops->ndo_bridge_getlink(skb, portid,
                                   seq, dev,
                                   filter_mask,
                                   NLM_F_MULTI);
                 if (err < 0 && err != -EOPNOTSUPP) {
                     if (likely(skb->len))
                         break;
 
                     goto out_err;
                 }
             }
             idx++;
         }
     }
     err = skb->len;
 out_err:
     rcu_read_unlock();
     cb->args[0] = idx;
 
     return err;
 }
 
 static inline size_t bridge_nlmsg_size(void)
 {
     return NLMSG_ALIGN(sizeof(struct ifinfomsg))
         + nla_total_size(IFNAMSIZ)  /* IFLA_IFNAME */
         + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
         + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
         + nla_total_size(sizeof(u32))   /* IFLA_MTU */
         + nla_total_size(sizeof(u32))   /* IFLA_LINK */
         + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
         + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
         + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
         + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
         + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
 }
 
 static int rtnl_bridge_notify(struct net_device *dev)
 {
     struct net *net = dev_net(dev);
     struct sk_buff *skb;
     int err = -EOPNOTSUPP;
 
     if (!dev->netdev_ops->ndo_bridge_getlink)
         return 0;
 
     skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
     if (!skb) {
         err = -ENOMEM;
         goto errout;
     }
 
     err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
     if (err < 0)
         goto errout;
 
     /* Notification info is only filled for bridge ports, not the bridge
      * device itself. Therefore, a zero notification length is valid and
      * should not result in an error.
      */
     if (!skb->len)
         goto errout;
 
     rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
     return 0;
 errout:
     WARN_ON(err == -EMSGSIZE);
     kfree_skb(skb);
     if (err)
         rtnl_set_sk_err(net, RTNLGRP_LINK, err);
     return err;
 }
 
 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
                    struct netlink_ext_ack *extack)
 {
     struct net *net = sock_net(skb->sk);
     struct ifinfomsg *ifm;
     struct net_device *dev;
     struct nlattr *br_spec, *attr = NULL;
     int rem, err = -EOPNOTSUPP;
     u16 flags = 0;
     bool have_flags = false;
 
     if (nlmsg_len(nlh) < sizeof(*ifm))
         return -EINVAL;
 
     ifm = nlmsg_data(nlh);
     if (ifm->ifi_family != AF_BRIDGE)
         return -EPFNOSUPPORT;
 
     dev = __dev_get_by_index(net, ifm->ifi_index);
     if (!dev) {
         NL_SET_ERR_MSG(extack, "unknown ifindex");
         return -ENODEV;
     }
 
     br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
     if (br_spec) {
         nla_for_each_nested(attr, br_spec, rem) {
             if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
                 if (nla_len(attr) < sizeof(flags))
                     return -EINVAL;
 
                 have_flags = true;
                 flags = nla_get_u16(attr);
                 break;
             }
         }
     }
 
     if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
 
         if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
             err = -EOPNOTSUPP;
             goto out;
         }
 
         err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
                                  extack);
         if (err)
             goto out;
 
         flags &= ~BRIDGE_FLAGS_MASTER;
     }
 
     if ((flags & BRIDGE_FLAGS_SELF)) {
         if (!dev->netdev_ops->ndo_bridge_setlink)
             err = -EOPNOTSUPP;
         else
             err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
                                   flags,
                                   extack);
         if (!err) {
             flags &= ~BRIDGE_FLAGS_SELF;
 
             /* Generate event to notify upper layer of bridge
              * change
              */
             err = rtnl_bridge_notify(dev);
         }
     }
 
     if (have_flags)
         memcpy(nla_data(attr), &flags, sizeof(flags));
 out:
     return err;
 }
 
 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
                    struct netlink_ext_ack *extack)
 {
     struct net *net = sock_net(skb->sk);
     struct ifinfomsg *ifm;
     struct net_device *dev;
     struct nlattr *br_spec, *attr = NULL;
     int rem, err = -EOPNOTSUPP;
     u16 flags = 0;
     bool have_flags = false;
 
     if (nlmsg_len(nlh) < sizeof(*ifm))
         return -EINVAL;
 
     ifm = nlmsg_data(nlh);
     if (ifm->ifi_family != AF_BRIDGE)
         return -EPFNOSUPPORT;
 
     dev = __dev_get_by_index(net, ifm->ifi_index);
     if (!dev) {
         NL_SET_ERR_MSG(extack, "unknown ifindex");
         return -ENODEV;
     }
 
     br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
     if (br_spec) {
         nla_for_each_nested(attr, br_spec, rem) {
             if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
                 if (nla_len(attr) < sizeof(flags))
                     return -EINVAL;
 
                 have_flags = true;
                 flags = nla_get_u16(attr);
                 break;
             }
         }
     }
 
     if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
 
         if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
             err = -EOPNOTSUPP;
             goto out;
         }
 
         err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
         if (err)
             goto out;
 
         flags &= ~BRIDGE_FLAGS_MASTER;
     }
 
     if ((flags & BRIDGE_FLAGS_SELF)) {
         if (!dev->netdev_ops->ndo_bridge_dellink)
             err = -EOPNOTSUPP;
         else
             err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
                                   flags);
 
         if (!err) {
             flags &= ~BRIDGE_FLAGS_SELF;
 
             /* Generate event to notify upper layer of bridge
              * change
              */
             err = rtnl_bridge_notify(dev);
         }
     }
 
     if (have_flags)
         memcpy(nla_data(attr), &flags, sizeof(flags));
 out:
     return err;
 }
 
 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
 {
     return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
            (!idxattr || idxattr == attrid);
 }
 
 static bool
 rtnl_offload_xstats_have_ndo(const struct net_device *dev, int attr_id)
 {
     return dev->netdev_ops &&
            dev->netdev_ops->ndo_has_offload_stats &&
            dev->netdev_ops->ndo_get_offload_stats &&
            dev->netdev_ops->ndo_has_offload_stats(dev, attr_id);
 }
 
 static unsigned int
 rtnl_offload_xstats_get_size_ndo(const struct net_device *dev, int attr_id)
 {
     return rtnl_offload_xstats_have_ndo(dev, attr_id) ?
            sizeof(struct rtnl_link_stats64) : 0;
 }
 
 static int
 rtnl_offload_xstats_fill_ndo(struct net_device *dev, int attr_id,
                  struct sk_buff *skb)
 {
     unsigned int size = rtnl_offload_xstats_get_size_ndo(dev, attr_id);
     struct nlattr *attr = NULL;
     void *attr_data;
     int err;
 
     if (!size)
         return -ENODATA;
 
     attr = nla_reserve_64bit(skb, attr_id, size,
                  IFLA_OFFLOAD_XSTATS_UNSPEC);
     if (!attr)
         return -EMSGSIZE;
 
     attr_data = nla_data(attr);
     memset(attr_data, 0, size);
 
     err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev, attr_data);
     if (err)
         return err;
 
     return 0;
 }
 
 static unsigned int
 rtnl_offload_xstats_get_size_stats(const struct net_device *dev,
                    enum netdev_offload_xstats_type type)
 {
     bool enabled = netdev_offload_xstats_enabled(dev, type);
 
     return enabled ? sizeof(struct rtnl_hw_stats64) : 0;
 }
 
 struct rtnl_offload_xstats_request_used {
     bool request;
     bool used;
 };
 
 static int
 rtnl_offload_xstats_get_stats(struct net_device *dev,
                   enum netdev_offload_xstats_type type,
                   struct rtnl_offload_xstats_request_used *ru,
                   struct rtnl_hw_stats64 *stats,
                   struct netlink_ext_ack *extack)
 {
     bool request;
     bool used;
     int err;
 
     request = netdev_offload_xstats_enabled(dev, type);
     if (!request) {
         used = false;
         goto out;
     }
 
     err = netdev_offload_xstats_get(dev, type, stats, &used, extack);
     if (err)
         return err;
 
 out:
     if (ru) {
         ru->request = request;
         ru->used = used;
     }
     return 0;
 }
 
 static int
 rtnl_offload_xstats_fill_hw_s_info_one(struct sk_buff *skb, int attr_id,
                        struct rtnl_offload_xstats_request_used *ru)
 {
     struct nlattr *nest;
 
     nest = nla_nest_start(skb, attr_id);
     if (!nest)
         return -EMSGSIZE;
 
     if (nla_put_u8(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO_REQUEST, ru->request))
         goto nla_put_failure;
 
     if (nla_put_u8(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO_USED, ru->used))
         goto nla_put_failure;
 
     nla_nest_end(skb, nest);
     return 0;
 
 nla_put_failure:
     nla_nest_cancel(skb, nest);
     return -EMSGSIZE;
 }
 
 static int
 rtnl_offload_xstats_fill_hw_s_info(struct sk_buff *skb, struct net_device *dev,
                    struct netlink_ext_ack *extack)
 {
     enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
     struct rtnl_offload_xstats_request_used ru_l3;
     struct nlattr *nest;
     int err;
 
     err = rtnl_offload_xstats_get_stats(dev, t_l3, &ru_l3, NULL, extack);
     if (err)
         return err;
 
     nest = nla_nest_start(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO);
     if (!nest)
         return -EMSGSIZE;
 
     if (rtnl_offload_xstats_fill_hw_s_info_one(skb,
                            IFLA_OFFLOAD_XSTATS_L3_STATS,
                            &ru_l3))
         goto nla_put_failure;
 
     nla_nest_end(skb, nest);
     return 0;
 
 nla_put_failure:
     nla_nest_cancel(skb, nest);
     return -EMSGSIZE;
 }
 
 static int rtnl_offload_xstats_fill(struct sk_buff *skb, struct net_device *dev,
                     int *prividx, u32 off_filter_mask,
                     struct netlink_ext_ack *extack)
 {
     enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
     int attr_id_hw_s_info = IFLA_OFFLOAD_XSTATS_HW_S_INFO;
     int attr_id_l3_stats = IFLA_OFFLOAD_XSTATS_L3_STATS;
     int attr_id_cpu_hit = IFLA_OFFLOAD_XSTATS_CPU_HIT;
     bool have_data = false;
     int err;
 
     if (*prividx <= attr_id_cpu_hit &&
         (off_filter_mask &
          IFLA_STATS_FILTER_BIT(attr_id_cpu_hit))) {
         err = rtnl_offload_xstats_fill_ndo(dev, attr_id_cpu_hit, skb);
         if (!err) {
             have_data = true;
         } else if (err != -ENODATA) {
             *prividx = attr_id_cpu_hit;
             return err;
         }
     }
 
     if (*prividx <= attr_id_hw_s_info &&
         (off_filter_mask & IFLA_STATS_FILTER_BIT(attr_id_hw_s_info))) {
         *prividx = attr_id_hw_s_info;
 
         err = rtnl_offload_xstats_fill_hw_s_info(skb, dev, extack);
         if (err)
             return err;
 
         have_data = true;
         *prividx = 0;
     }
 
     if (*prividx <= attr_id_l3_stats &&
         (off_filter_mask & IFLA_STATS_FILTER_BIT(attr_id_l3_stats))) {
         unsigned int size_l3;
         struct nlattr *attr;
 
         *prividx = attr_id_l3_stats;
 
         size_l3 = rtnl_offload_xstats_get_size_stats(dev, t_l3);
         if (!size_l3)
             goto skip_l3_stats;
         attr = nla_reserve_64bit(skb, attr_id_l3_stats, size_l3,
                      IFLA_OFFLOAD_XSTATS_UNSPEC);
         if (!attr)
             return -EMSGSIZE;
 
         err = rtnl_offload_xstats_get_stats(dev, t_l3, NULL,
                             nla_data(attr), extack);
         if (err)
             return err;
 
         have_data = true;
 skip_l3_stats:
         *prividx = 0;
     }
 
     if (!have_data)
         return -ENODATA;
 
     *prividx = 0;
     return 0;
 }
 
 static unsigned int
 rtnl_offload_xstats_get_size_hw_s_info_one(const struct net_device *dev,
                        enum netdev_offload_xstats_type type)
 {
     bool enabled = netdev_offload_xstats_enabled(dev, type);
 
     return nla_total_size(0) +
         /* IFLA_OFFLOAD_XSTATS_HW_S_INFO_REQUEST */
         nla_total_size(sizeof(u8)) +
         /* IFLA_OFFLOAD_XSTATS_HW_S_INFO_USED */
         (enabled ? nla_total_size(sizeof(u8)) : 0) +
         0;
 }
 
 static unsigned int
 rtnl_offload_xstats_get_size_hw_s_info(const struct net_device *dev)
 {
     enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
 
     return nla_total_size(0) +
         /* IFLA_OFFLOAD_XSTATS_L3_STATS */
         rtnl_offload_xstats_get_size_hw_s_info_one(dev, t_l3) +
         0;
 }
 
 static int rtnl_offload_xstats_get_size(const struct net_device *dev,
                     u32 off_filter_mask)
 {
     enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
     int attr_id_cpu_hit = IFLA_OFFLOAD_XSTATS_CPU_HIT;
     int nla_size = 0;
     int size;
 
     if (off_filter_mask &
         IFLA_STATS_FILTER_BIT(attr_id_cpu_hit)) {
         size = rtnl_offload_xstats_get_size_ndo(dev, attr_id_cpu_hit);
         nla_size += nla_total_size_64bit(size);
     }
 
     if (off_filter_mask &
         IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO))
         nla_size += rtnl_offload_xstats_get_size_hw_s_info(dev);
 
     if (off_filter_mask &
         IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_L3_STATS)) {
         size = rtnl_offload_xstats_get_size_stats(dev, t_l3);
         nla_size += nla_total_size_64bit(size);
     }
 
     if (nla_size != 0)
         nla_size += nla_total_size(0);
 
     return nla_size;
 }
 
 struct rtnl_stats_dump_filters {
     /* mask[0] filters outer attributes. Then individual nests have their
      * filtering mask at the index of the nested attribute.
      */
     u32 mask[IFLA_STATS_MAX + 1];
 };
 
 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
                    int type, u32 pid, u32 seq, u32 change,
                    unsigned int flags,
                    const struct rtnl_stats_dump_filters *filters,
                    int *idxattr, int *prividx,
                    struct netlink_ext_ack *extack)
 {
     unsigned int filter_mask = filters->mask[0];
     struct if_stats_msg *ifsm;
     struct nlmsghdr *nlh;
     struct nlattr *attr;
     int s_prividx = *prividx;
     int err;
 
     ASSERT_RTNL();
 
     nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
     if (!nlh)
         return -EMSGSIZE;
 
     ifsm = nlmsg_data(nlh);
     ifsm->family = PF_UNSPEC;
     ifsm->pad1 = 0;
     ifsm->pad2 = 0;
     ifsm->ifindex = dev->ifindex;
     ifsm->filter_mask = filter_mask;
 
     if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
         struct rtnl_link_stats64 *sp;
 
         attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
                      sizeof(struct rtnl_link_stats64),
                      IFLA_STATS_UNSPEC);
         if (!attr) {
             err = -EMSGSIZE;
             goto nla_put_failure;
         }
 
         sp = nla_data(attr);
         dev_get_stats(dev, sp);
     }
 
     if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 
         if (ops && ops->fill_linkxstats) {
             *idxattr = IFLA_STATS_LINK_XSTATS;
             attr = nla_nest_start_noflag(skb,
                              IFLA_STATS_LINK_XSTATS);
             if (!attr) {
                 err = -EMSGSIZE;
                 goto nla_put_failure;
             }
 
             err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
             nla_nest_end(skb, attr);
             if (err)
                 goto nla_put_failure;
             *idxattr = 0;
         }
     }
 
     if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
                  *idxattr)) {
         const struct rtnl_link_ops *ops = NULL;
         const struct net_device *master;
 
         master = netdev_master_upper_dev_get(dev);
         if (master)
             ops = master->rtnl_link_ops;
         if (ops && ops->fill_linkxstats) {
             *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
             attr = nla_nest_start_noflag(skb,
                              IFLA_STATS_LINK_XSTATS_SLAVE);
             if (!attr) {
                 err = -EMSGSIZE;
                 goto nla_put_failure;
             }
 
             err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
             nla_nest_end(skb, attr);
             if (err)
                 goto nla_put_failure;
             *idxattr = 0;
         }
     }
 
     if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
                  *idxattr)) {
         u32 off_filter_mask;
 
         off_filter_mask = filters->mask[IFLA_STATS_LINK_OFFLOAD_XSTATS];
         *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
         attr = nla_nest_start_noflag(skb,
                          IFLA_STATS_LINK_OFFLOAD_XSTATS);
         if (!attr) {
             err = -EMSGSIZE;
             goto nla_put_failure;
         }
 
         err = rtnl_offload_xstats_fill(skb, dev, prividx,
                            off_filter_mask, extack);
         if (err == -ENODATA)
             nla_nest_cancel(skb, attr);
         else
             nla_nest_end(skb, attr);
 
         if (err && err != -ENODATA)
             goto nla_put_failure;
         *idxattr = 0;
     }
 
     if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
         struct rtnl_af_ops *af_ops;
 
         *idxattr = IFLA_STATS_AF_SPEC;
         attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC);
         if (!attr) {
             err = -EMSGSIZE;
             goto nla_put_failure;
         }
 
         rcu_read_lock();
         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
             if (af_ops->fill_stats_af) {
                 struct nlattr *af;
 
                 af = nla_nest_start_noflag(skb,
                                af_ops->family);
                 if (!af) {
                     rcu_read_unlock();
                     err = -EMSGSIZE;
                     goto nla_put_failure;
                 }
                 err = af_ops->fill_stats_af(skb, dev);
 
                 if (err == -ENODATA) {
                     nla_nest_cancel(skb, af);
                 } else if (err < 0) {
                     rcu_read_unlock();
                     goto nla_put_failure;
                 }
 
                 nla_nest_end(skb, af);
             }
         }
         rcu_read_unlock();
 
         nla_nest_end(skb, attr);
 
         *idxattr = 0;
     }
 
     nlmsg_end(skb, nlh);
 
     return 0;
 
 nla_put_failure:
     /* not a multi message or no progress mean a real error */
     if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
         nlmsg_cancel(skb, nlh);
     else
         nlmsg_end(skb, nlh);
 
     return err;
 }
 
 static size_t if_nlmsg_stats_size(const struct net_device *dev,
                   const struct rtnl_stats_dump_filters *filters)
 {
     size_t size = NLMSG_ALIGN(sizeof(struct if_stats_msg));
     unsigned int filter_mask = filters->mask[0];
 
     if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
         size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
 
     if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
         int attr = IFLA_STATS_LINK_XSTATS;
 
         if (ops && ops->get_linkxstats_size) {
             size += nla_total_size(ops->get_linkxstats_size(dev,
                                     attr));
             /* for IFLA_STATS_LINK_XSTATS */
             size += nla_total_size(0);
         }
     }
 
     if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
         struct net_device *_dev = (struct net_device *)dev;
         const struct rtnl_link_ops *ops = NULL;
         const struct net_device *master;
 
         /* netdev_master_upper_dev_get can't take const */
         master = netdev_master_upper_dev_get(_dev);
         if (master)
             ops = master->rtnl_link_ops;
         if (ops && ops->get_linkxstats_size) {
             int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
 
             size += nla_total_size(ops->get_linkxstats_size(dev,
                                     attr));
             /* for IFLA_STATS_LINK_XSTATS_SLAVE */
             size += nla_total_size(0);
         }
     }
 
     if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0)) {
         u32 off_filter_mask;
 
         off_filter_mask = filters->mask[IFLA_STATS_LINK_OFFLOAD_XSTATS];
         size += rtnl_offload_xstats_get_size(dev, off_filter_mask);
     }
 
     if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
         struct rtnl_af_ops *af_ops;
 
         /* for IFLA_STATS_AF_SPEC */
         size += nla_total_size(0);
 
         rcu_read_lock();
         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
             if (af_ops->get_stats_af_size) {
                 size += nla_total_size(
                     af_ops->get_stats_af_size(dev));
 
                 /* for AF_* */
                 size += nla_total_size(0);
             }
         }
         rcu_read_unlock();
     }
 
     return size;
 }
 
 #define RTNL_STATS_OFFLOAD_XSTATS_VALID ((1 << __IFLA_OFFLOAD_XSTATS_MAX) - 1)
 
 static const struct nla_policy
 rtnl_stats_get_policy_filters[IFLA_STATS_MAX + 1] = {
     [IFLA_STATS_LINK_OFFLOAD_XSTATS] =
             NLA_POLICY_MASK(NLA_U32, RTNL_STATS_OFFLOAD_XSTATS_VALID),
 };
 
 static const struct nla_policy
 rtnl_stats_get_policy[IFLA_STATS_GETSET_MAX + 1] = {
     [IFLA_STATS_GET_FILTERS] =
             NLA_POLICY_NESTED(rtnl_stats_get_policy_filters),
 };
 
 static const struct nla_policy
 ifla_stats_set_policy[IFLA_STATS_GETSET_MAX + 1] = {
     [IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS] = NLA_POLICY_MAX(NLA_U8, 1),
 };
 
 static int rtnl_stats_get_parse_filters(struct nlattr *ifla_filters,
                     struct rtnl_stats_dump_filters *filters,
                     struct netlink_ext_ack *extack)
 {
     struct nlattr *tb[IFLA_STATS_MAX + 1];
     int err;
     int at;
 
     err = nla_parse_nested(tb, IFLA_STATS_MAX, ifla_filters,
                    rtnl_stats_get_policy_filters, extack);
     if (err < 0)
         return err;
 
     for (at = 1; at <= IFLA_STATS_MAX; at++) {
         if (tb[at]) {
             if (!(filters->mask[0] & IFLA_STATS_FILTER_BIT(at))) {
                 NL_SET_ERR_MSG(extack, "Filtered attribute not enabled in filter_mask");
                 return -EINVAL;
             }
             filters->mask[at] = nla_get_u32(tb[at]);
         }
     }
 
     return 0;
 }
 
 static int rtnl_stats_get_parse(const struct nlmsghdr *nlh,
                 u32 filter_mask,
                 struct rtnl_stats_dump_filters *filters,
                 struct netlink_ext_ack *extack)
 {
     struct nlattr *tb[IFLA_STATS_GETSET_MAX + 1];
     int err;
     int i;
 
     filters->mask[0] = filter_mask;
     for (i = 1; i < ARRAY_SIZE(filters->mask); i++)
         filters->mask[i] = -1U;
 
     err = nlmsg_parse(nlh, sizeof(struct if_stats_msg), tb,
               IFLA_STATS_GETSET_MAX, rtnl_stats_get_policy, extack);
     if (err < 0)
         return err;
 
     if (tb[IFLA_STATS_GET_FILTERS]) {
         err = rtnl_stats_get_parse_filters(tb[IFLA_STATS_GET_FILTERS],
                            filters, extack);
         if (err)
             return err;
     }
 
     return 0;
 }
 
 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check,
                 bool is_dump, struct netlink_ext_ack *extack)
 {
     struct if_stats_msg *ifsm;
 
     if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) {
         NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
         return -EINVAL;
     }
 
     if (!strict_check)
         return 0;
 
     ifsm = nlmsg_data(nlh);
 
     /* only requests using strict checks can pass data to influence
      * the dump. The legacy exception is filter_mask.
      */
     if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) {
         NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
         return -EINVAL;
     }
     if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) {
         NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask");
         return -EINVAL;
     }
 
     return 0;
 }
 
 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
               struct netlink_ext_ack *extack)
 {
     struct rtnl_stats_dump_filters filters;
     struct net *net = sock_net(skb->sk);
     struct net_device *dev = NULL;
     int idxattr = 0, prividx = 0;
     struct if_stats_msg *ifsm;
     struct sk_buff *nskb;
     int err;
 
     err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
                    false, extack);
     if (err)
         return err;
 
     ifsm = nlmsg_data(nlh);
     if (ifsm->ifindex > 0)
         dev = __dev_get_by_index(net, ifsm->ifindex);
     else
         return -EINVAL;
 
     if (!dev)
         return -ENODEV;
 
     if (!ifsm->filter_mask) {
         NL_SET_ERR_MSG(extack, "Filter mask must be set for stats get");
         return -EINVAL;
     }
 
     err = rtnl_stats_get_parse(nlh, ifsm->filter_mask, &filters, extack);
     if (err)
         return err;
 
     nskb = nlmsg_new(if_nlmsg_stats_size(dev, &filters), GFP_KERNEL);
     if (!nskb)
         return -ENOBUFS;
 
     err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
                   0, &filters, &idxattr, &prividx, extack);
     if (err < 0) {
         /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
         WARN_ON(err == -EMSGSIZE);
         kfree_skb(nskb);
     } else {
         err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
     }
 
     return err;
 }
 
 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
 {
     struct netlink_ext_ack *extack = cb->extack;
     int h, s_h, err, s_idx, s_idxattr, s_prividx;
     struct rtnl_stats_dump_filters filters;
     struct net *net = sock_net(skb->sk);
     unsigned int flags = NLM_F_MULTI;
     struct if_stats_msg *ifsm;
     struct hlist_head *head;
     struct net_device *dev;
     int idx = 0;
 
     s_h = cb->args[0];
     s_idx = cb->args[1];
     s_idxattr = cb->args[2];
     s_prividx = cb->args[3];
 
     cb->seq = net->dev_base_seq;
 
     err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack);
     if (err)
         return err;
 
     ifsm = nlmsg_data(cb->nlh);
     if (!ifsm->filter_mask) {
         NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
         return -EINVAL;
     }
 
     err = rtnl_stats_get_parse(cb->nlh, ifsm->filter_mask, &filters,
                    extack);
     if (err)
         return err;
 
     for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
         idx = 0;
         head = &net->dev_index_head[h];
         hlist_for_each_entry(dev, head, index_hlist) {
             if (idx < s_idx)
                 goto cont;
             err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
                           NETLINK_CB(cb->skb).portid,
                           cb->nlh->nlmsg_seq, 0,
                           flags, &filters,
                           &s_idxattr, &s_prividx,
                           extack);
             /* If we ran out of room on the first message,
              * we're in trouble
              */
             WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
 
             if (err < 0)
                 goto out;
             s_prividx = 0;
             s_idxattr = 0;
             nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 cont:
             idx++;
         }
     }
 out:
     cb->args[3] = s_prividx;
     cb->args[2] = s_idxattr;
     cb->args[1] = idx;
     cb->args[0] = h;
 
     return skb->len;
 }
 
 void rtnl_offload_xstats_notify(struct net_device *dev)
 {
     struct rtnl_stats_dump_filters response_filters = {};
     struct net *net = dev_net(dev);
     int idxattr = 0, prividx = 0;
     struct sk_buff *skb;
     int err = -ENOBUFS;
 
     ASSERT_RTNL();
 
     response_filters.mask[0] |=
         IFLA_STATS_FILTER_BIT(IFLA_STATS_LINK_OFFLOAD_XSTATS);
     response_filters.mask[IFLA_STATS_LINK_OFFLOAD_XSTATS] |=
         IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO);
 
     skb = nlmsg_new(if_nlmsg_stats_size(dev, &response_filters),
             GFP_KERNEL);
     if (!skb)
         goto errout;
 
     err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS, 0, 0, 0, 0,
                   &response_filters, &idxattr, &prividx, NULL);
     if (err < 0) {
         kfree_skb(skb);
         goto errout;
     }
 
     rtnl_notify(skb, net, 0, RTNLGRP_STATS, NULL, GFP_KERNEL);
     return;
 
 errout:
     rtnl_set_sk_err(net, RTNLGRP_STATS, err);
 }
 EXPORT_SYMBOL(rtnl_offload_xstats_notify);
 
 static int rtnl_stats_set(struct sk_buff *skb, struct nlmsghdr *nlh,
               struct netlink_ext_ack *extack)
 {
     enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
     struct rtnl_stats_dump_filters response_filters = {};
     struct nlattr *tb[IFLA_STATS_GETSET_MAX + 1];
     struct net *net = sock_net(skb->sk);
     struct net_device *dev = NULL;
     struct if_stats_msg *ifsm;
     bool notify = false;
     int err;
 
     err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
                    false, extack);
     if (err)
         return err;
 
     ifsm = nlmsg_data(nlh);
     if (ifsm->family != AF_UNSPEC) {
         NL_SET_ERR_MSG(extack, "Address family should be AF_UNSPEC");
         return -EINVAL;
     }
 
     if (ifsm->ifindex > 0)
         dev = __dev_get_by_index(net, ifsm->ifindex);
     else
         return -EINVAL;
 
     if (!dev)
         return -ENODEV;
 
     if (ifsm->filter_mask) {
         NL_SET_ERR_MSG(extack, "Filter mask must be 0 for stats set");
         return -EINVAL;
     }
 
     err = nlmsg_parse(nlh, sizeof(*ifsm), tb, IFLA_STATS_GETSET_MAX,
               ifla_stats_set_policy, extack);
     if (err < 0)
         return err;
 
     if (tb[IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS]) {
         u8 req = nla_get_u8(tb[IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS]);
 
         if (req)
             err = netdev_offload_xstats_enable(dev, t_l3, extack);
         else
             err = netdev_offload_xstats_disable(dev, t_l3);
 
         if (!err)
             notify = true;
         else if (err != -EALREADY)
             return err;
 
         response_filters.mask[0] |=
             IFLA_STATS_FILTER_BIT(IFLA_STATS_LINK_OFFLOAD_XSTATS);
         response_filters.mask[IFLA_STATS_LINK_OFFLOAD_XSTATS] |=
             IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO);
     }
 
     if (notify)
         rtnl_offload_xstats_notify(dev);
 
     return 0;
 }
 
 /* Process one rtnetlink message. */
 
 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
                  struct netlink_ext_ack *extack)
 {
     struct net *net = sock_net(skb->sk);
     struct rtnl_link *link;
     enum rtnl_kinds kind;
     struct module *owner;
     int err = -EOPNOTSUPP;
     rtnl_doit_func doit;
     unsigned int flags;
     int family;
     int type;
 
     type = nlh->nlmsg_type;
     if (type > RTM_MAX)
         return -EOPNOTSUPP;
 
     type -= RTM_BASE;
 
     /* All the messages must have at least 1 byte length */
     if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
         return 0;
 
     family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
     kind = rtnl_msgtype_kind(type);
 
     if (kind != RTNL_KIND_GET && !netlink_net_capable(skb, CAP_NET_ADMIN))
         return -EPERM;
 
     rcu_read_lock();
     if (kind == RTNL_KIND_GET && (nlh->nlmsg_flags & NLM_F_DUMP)) {
         struct sock *rtnl;
         rtnl_dumpit_func dumpit;
         u32 min_dump_alloc = 0;
 
         link = rtnl_get_link(family, type);
         if (!link || !link->dumpit) {
             family = PF_UNSPEC;
             link = rtnl_get_link(family, type);
             if (!link || !link->dumpit)
                 goto err_unlock;
         }
         owner = link->owner;
         dumpit = link->dumpit;
 
         if (type == RTM_GETLINK - RTM_BASE)
             min_dump_alloc = rtnl_calcit(skb, nlh);
 
         err = 0;
         /* need to do this before rcu_read_unlock() */
         if (!try_module_get(owner))
             err = -EPROTONOSUPPORT;
 
         rcu_read_unlock();
 
         rtnl = net->rtnl;
         if (err == 0) {
             struct netlink_dump_control c = {
                 .dump       = dumpit,
                 .min_dump_alloc = min_dump_alloc,
                 .module     = owner,
             };
             err = netlink_dump_start(rtnl, skb, nlh, &c);
             /* netlink_dump_start() will keep a reference on
              * module if dump is still in progress.
              */
             module_put(owner);
         }
         return err;
     }
 
     link = rtnl_get_link(family, type);
     if (!link || !link->doit) {
         family = PF_UNSPEC;
         link = rtnl_get_link(PF_UNSPEC, type);
         if (!link || !link->doit)
             goto out_unlock;
     }
 
     owner = link->owner;
     if (!try_module_get(owner)) {
         err = -EPROTONOSUPPORT;
         goto out_unlock;
     }
 
     flags = link->flags;
     if (kind == RTNL_KIND_DEL && (nlh->nlmsg_flags & NLM_F_BULK) &&
         !(flags & RTNL_FLAG_BULK_DEL_SUPPORTED)) {
         NL_SET_ERR_MSG(extack, "Bulk delete is not supported");
         module_put(owner);
         goto err_unlock;
     }
 
     if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
         doit = link->doit;
         rcu_read_unlock();
         if (doit)
             err = doit(skb, nlh, extack);
         module_put(owner);
         return err;
     }
     rcu_read_unlock();
 
     rtnl_lock();
     link = rtnl_get_link(family, type);
     if (link && link->doit)
         err = link->doit(skb, nlh, extack);
     rtnl_unlock();
 
     module_put(owner);
 
     return err;
 
 out_unlock:
     rcu_read_unlock();
     return err;
 
 err_unlock:
     rcu_read_unlock();
     return -EOPNOTSUPP;
 }
 
 static void rtnetlink_rcv(struct sk_buff *skb)
 {
     netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
 }
 
 static int rtnetlink_bind(struct net *net, int group)
 {
     switch (group) {
     case RTNLGRP_IPV4_MROUTE_R:
     case RTNLGRP_IPV6_MROUTE_R:
         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
             return -EPERM;
         break;
     }
     return 0;
 }
 
 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
 {
     struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 
     switch (event) {
     case NETDEV_REBOOT:
     case NETDEV_CHANGEMTU:
     case NETDEV_CHANGEADDR:
     case NETDEV_CHANGENAME:
     case NETDEV_FEAT_CHANGE:
     case NETDEV_BONDING_FAILOVER:
     case NETDEV_POST_TYPE_CHANGE:
     case NETDEV_NOTIFY_PEERS:
     case NETDEV_CHANGEUPPER:
     case NETDEV_RESEND_IGMP:
     case NETDEV_CHANGEINFODATA:
     case NETDEV_CHANGELOWERSTATE:
     case NETDEV_CHANGE_TX_QUEUE_LEN:
         rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
                    GFP_KERNEL, NULL, 0);
         break;
     default:
         break;
     }
     return NOTIFY_DONE;
 }
 
 static struct notifier_block rtnetlink_dev_notifier = {
     .notifier_call  = rtnetlink_event,
 };
 
 
 static int __net_init rtnetlink_net_init(struct net *net)
 {
     struct sock *sk;
     struct netlink_kernel_cfg cfg = {
         .groups     = RTNLGRP_MAX,
         .input      = rtnetlink_rcv,
         .cb_mutex   = &rtnl_mutex,
         .flags      = NL_CFG_F_NONROOT_RECV,
         .bind       = rtnetlink_bind,
     };
 
     sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
     if (!sk)
         return -ENOMEM;
     net->rtnl = sk;
     return 0;
 }
 
 static void __net_exit rtnetlink_net_exit(struct net *net)
 {
     netlink_kernel_release(net->rtnl);
     net->rtnl = NULL;
 }
 
 static struct pernet_operations rtnetlink_net_ops = {
     .init = rtnetlink_net_init,
     .exit = rtnetlink_net_exit,
 };
 
 void __init rtnetlink_init(void)
 {
     if (register_pernet_subsys(&rtnetlink_net_ops))
         panic("rtnetlink_init: cannot initialize rtnetlink\n");
 
     register_netdevice_notifier(&rtnetlink_dev_notifier);
 
     rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
               rtnl_dump_ifinfo, 0);
     rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
     rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
     rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
 
     rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
     rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
     rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
 
     rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0);
     rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0);
 
     rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
     rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL,
               RTNL_FLAG_BULK_DEL_SUPPORTED);
     rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
 
     rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
     rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
     rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
 
     rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
               0);
     rtnl_register(PF_UNSPEC, RTM_SETSTATS, rtnl_stats_set, NULL, 0);
 }