net/core/rtnetlink.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
rtnl_lock
rtnl_lock_killable
rtnl_kfree_skbs
__rtnl_unlock
rtnl_unlock
rtnl_trylock
rtnl_is_locked
refcount_dec_and_rtnl_lock
lockdep_rtnl_is_held
rtm_msgindex
rtnl_get_link
rtnl_register_internal
rtnl_register_module
rtnl_register
rtnl_unregister
rtnl_unregister_all
rtnl_link_ops_get
__rtnl_link_register
rtnl_link_register
__rtnl_kill_links
__rtnl_link_unregister
rtnl_lock_unregistering_all
rtnl_link_unregister
rtnl_link_get_slave_info_data_size
rtnl_link_get_size
rtnl_af_lookup
rtnl_af_register
rtnl_af_unregister
rtnl_link_get_af_size
rtnl_have_link_slave_info
rtnl_link_slave_info_fill
rtnl_link_info_fill
rtnl_link_fill
rtnetlink_send
rtnl_unicast
rtnl_notify
rtnl_set_sk_err
rtnetlink_put_metrics
rtnl_put_cacheinfo
set_operstate
rtnl_dev_get_flags
rtnl_dev_combine_flags
copy_rtnl_link_stats
rtnl_vfinfo_size
rtnl_port_size
rtnl_xdp_size
if_nlmsg_size
rtnl_vf_ports_fill
rtnl_port_self_fill
rtnl_port_fill
rtnl_phys_port_id_fill
rtnl_phys_port_name_fill
rtnl_phys_switch_id_fill
rtnl_fill_stats
rtnl_fill_vfinfo
rtnl_fill_vf
rtnl_fill_link_ifmap
rtnl_xdp_prog_skb
rtnl_xdp_prog_drv
rtnl_xdp_prog_hw
rtnl_xdp_report_one
rtnl_xdp_fill
rtnl_get_event
put_master_ifindex
nla_put_iflink
nla_put_ifalias
rtnl_fill_link_netnsid
rtnl_fill_link_af
rtnl_fill_ifinfo
linkinfo_to_kind_ops
link_master_filtered
link_kind_filtered
link_dump_filtered
rtnl_get_net_ns_capable
rtnl_valid_dump_ifinfo_req
rtnl_dump_ifinfo
rtnl_nla_parse_ifla
rtnl_link_get_net
rtnl_link_get_net_by_nlattr
rtnl_link_get_net_capable
rtnl_ensure_unique_netns
validate_linkmsg
handle_infiniband_guid
handle_vf_guid
do_setvfinfo
do_set_master
do_setlink
rtnl_setlink
rtnl_group_dellink
rtnl_delete_link
rtnl_dellink
rtnl_configure_link
rtnl_create_link
rtnl_group_changelink
__rtnl_newlink
rtnl_newlink
rtnl_valid_getlink_req
rtnl_getlink
rtnl_calcit
rtnl_dump_all
rtmsg_ifinfo_build_skb
rtmsg_ifinfo_send
rtmsg_ifinfo_event
rtmsg_ifinfo
rtmsg_ifinfo_newnet
nlmsg_populate_fdb_fill
rtnl_fdb_nlmsg_size
rtnl_fdb_notify
ndo_dflt_fdb_add
fdb_vid_parse
rtnl_fdb_add
ndo_dflt_fdb_del
rtnl_fdb_del
nlmsg_populate_fdb
ndo_dflt_fdb_dump
valid_fdb_dump_strict
valid_fdb_dump_legacy
rtnl_fdb_dump
valid_fdb_get_strict
rtnl_fdb_get
brport_nla_put_flag
ndo_dflt_bridge_getlink
valid_bridge_getlink_req
rtnl_bridge_getlink
bridge_nlmsg_size
rtnl_bridge_notify
rtnl_bridge_setlink
rtnl_bridge_dellink
stats_attr_valid
rtnl_get_offload_stats_attr_size
rtnl_get_offload_stats
rtnl_get_offload_stats_size
rtnl_fill_statsinfo
if_nlmsg_stats_size
rtnl_valid_stats_req
rtnl_stats_get
rtnl_stats_dump
rtnetlink_rcv_msg
rtnetlink_rcv
rtnetlink_bind
rtnetlink_event
rtnetlink_net_init
rtnetlink_net_exit
rtnetlink_init
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   4  *              operating system.  INET is implemented using the  BSD Socket
   5  *              interface as the means of communication with the user level.
   6  *
   7  *              Routing netlink socket interface: protocol independent part.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  *      Fixes:
  12  *      Vitaly E. Lavrov                RTA_OK arithmetics was wrong.
  13  */
  14 
  15 #include <linux/bitops.h>
  16 #include <linux/errno.h>
  17 #include <linux/module.h>
  18 #include <linux/types.h>
  19 #include <linux/socket.h>
  20 #include <linux/kernel.h>
  21 #include <linux/timer.h>
  22 #include <linux/string.h>
  23 #include <linux/sockios.h>
  24 #include <linux/net.h>
  25 #include <linux/fcntl.h>
  26 #include <linux/mm.h>
  27 #include <linux/slab.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/capability.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/init.h>
  32 #include <linux/security.h>
  33 #include <linux/mutex.h>
  34 #include <linux/if_addr.h>
  35 #include <linux/if_bridge.h>
  36 #include <linux/if_vlan.h>
  37 #include <linux/pci.h>
  38 #include <linux/etherdevice.h>
  39 #include <linux/bpf.h>
  40 
  41 #include <linux/uaccess.h>
  42 
  43 #include <linux/inet.h>
  44 #include <linux/netdevice.h>
  45 #include <net/ip.h>
  46 #include <net/protocol.h>
  47 #include <net/arp.h>
  48 #include <net/route.h>
  49 #include <net/udp.h>
  50 #include <net/tcp.h>
  51 #include <net/sock.h>
  52 #include <net/pkt_sched.h>
  53 #include <net/fib_rules.h>
  54 #include <net/rtnetlink.h>
  55 #include <net/net_namespace.h>
  56 
  57 #define RTNL_MAX_TYPE           50
  58 #define RTNL_SLAVE_MAX_TYPE     36
  59 
  60 struct rtnl_link {
  61         rtnl_doit_func          doit;
  62         rtnl_dumpit_func        dumpit;
  63         struct module           *owner;
  64         unsigned int            flags;
  65         struct rcu_head         rcu;
  66 };
  67 
  68 static DEFINE_MUTEX(rtnl_mutex);
  69 
  70 void rtnl_lock(void)
  71 {
  72         mutex_lock(&rtnl_mutex);
  73 }
  74 EXPORT_SYMBOL(rtnl_lock);
  75 
  76 int rtnl_lock_killable(void)
  77 {
  78         return mutex_lock_killable(&rtnl_mutex);
  79 }
  80 EXPORT_SYMBOL(rtnl_lock_killable);
  81 
  82 static struct sk_buff *defer_kfree_skb_list;
  83 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
  84 {
  85         if (head && tail) {
  86                 tail->next = defer_kfree_skb_list;
  87                 defer_kfree_skb_list = head;
  88         }
  89 }
  90 EXPORT_SYMBOL(rtnl_kfree_skbs);
  91 
  92 void __rtnl_unlock(void)
  93 {
  94         struct sk_buff *head = defer_kfree_skb_list;
  95 
  96         defer_kfree_skb_list = NULL;
  97 
  98         mutex_unlock(&rtnl_mutex);
  99 
 100         while (head) {
 101                 struct sk_buff *next = head->next;
 102 
 103                 kfree_skb(head);
 104                 cond_resched();
 105                 head = next;
 106         }
 107 }
 108 
 109 void rtnl_unlock(void)
 110 {
 111         /* This fellow will unlock it for us. */
 112         netdev_run_todo();
 113 }
 114 EXPORT_SYMBOL(rtnl_unlock);
 115 
 116 int rtnl_trylock(void)
 117 {
 118         return mutex_trylock(&rtnl_mutex);
 119 }
 120 EXPORT_SYMBOL(rtnl_trylock);
 121 
 122 int rtnl_is_locked(void)
 123 {
 124         return mutex_is_locked(&rtnl_mutex);
 125 }
 126 EXPORT_SYMBOL(rtnl_is_locked);
 127 
 128 bool refcount_dec_and_rtnl_lock(refcount_t *r)
 129 {
 130         return refcount_dec_and_mutex_lock(r, &rtnl_mutex);
 131 }
 132 EXPORT_SYMBOL(refcount_dec_and_rtnl_lock);
 133 
 134 #ifdef CONFIG_PROVE_LOCKING
 135 bool lockdep_rtnl_is_held(void)
 136 {
 137         return lockdep_is_held(&rtnl_mutex);
 138 }
 139 EXPORT_SYMBOL(lockdep_rtnl_is_held);
 140 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 141 
 142 static struct rtnl_link *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 143 
 144 static inline int rtm_msgindex(int msgtype)
 145 {
 146         int msgindex = msgtype - RTM_BASE;
 147 
 148         /*
 149          * msgindex < 0 implies someone tried to register a netlink
 150          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 151          * the message type has not been added to linux/rtnetlink.h
 152          */
 153         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 154 
 155         return msgindex;
 156 }
 157 
 158 static struct rtnl_link *rtnl_get_link(int protocol, int msgtype)
 159 {
 160         struct rtnl_link **tab;
 161 
 162         if (protocol >= ARRAY_SIZE(rtnl_msg_handlers))
 163                 protocol = PF_UNSPEC;
 164 
 165         tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]);
 166         if (!tab)
 167                 tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]);
 168 
 169         return tab[msgtype];
 170 }
 171 
 172 static int rtnl_register_internal(struct module *owner,
 173                                   int protocol, int msgtype,
 174                                   rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 175                                   unsigned int flags)
 176 {
 177         struct rtnl_link *link, *old;
 178         struct rtnl_link __rcu **tab;
 179         int msgindex;
 180         int ret = -ENOBUFS;
 181 
 182         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 183         msgindex = rtm_msgindex(msgtype);
 184 
 185         rtnl_lock();
 186         tab = rtnl_msg_handlers[protocol];
 187         if (tab == NULL) {
 188                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL);
 189                 if (!tab)
 190                         goto unlock;
 191 
 192                 /* ensures we see the 0 stores */
 193                 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
 194         }
 195 
 196         old = rtnl_dereference(tab[msgindex]);
 197         if (old) {
 198                 link = kmemdup(old, sizeof(*old), GFP_KERNEL);
 199                 if (!link)
 200                         goto unlock;
 201         } else {
 202                 link = kzalloc(sizeof(*link), GFP_KERNEL);
 203                 if (!link)
 204                         goto unlock;
 205         }
 206 
 207         WARN_ON(link->owner && link->owner != owner);
 208         link->owner = owner;
 209 
 210         WARN_ON(doit && link->doit && link->doit != doit);
 211         if (doit)
 212                 link->doit = doit;
 213         WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit);
 214         if (dumpit)
 215                 link->dumpit = dumpit;
 216 
 217         link->flags |= flags;
 218 
 219         /* publish protocol:msgtype */
 220         rcu_assign_pointer(tab[msgindex], link);
 221         ret = 0;
 222         if (old)
 223                 kfree_rcu(old, rcu);
 224 unlock:
 225         rtnl_unlock();
 226         return ret;
 227 }
 228 
 229 /**
 230  * rtnl_register_module - Register a rtnetlink message type
 231  *
 232  * @owner: module registering the hook (THIS_MODULE)
 233  * @protocol: Protocol family or PF_UNSPEC
 234  * @msgtype: rtnetlink message type
 235  * @doit: Function pointer called for each request message
 236  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 237  * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
 238  *
 239  * Like rtnl_register, but for use by removable modules.
 240  */
 241 int rtnl_register_module(struct module *owner,
 242                          int protocol, int msgtype,
 243                          rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 244                          unsigned int flags)
 245 {
 246         return rtnl_register_internal(owner, protocol, msgtype,
 247                                       doit, dumpit, flags);
 248 }
 249 EXPORT_SYMBOL_GPL(rtnl_register_module);
 250 
 251 /**
 252  * rtnl_register - Register a rtnetlink message type
 253  * @protocol: Protocol family or PF_UNSPEC
 254  * @msgtype: rtnetlink message type
 255  * @doit: Function pointer called for each request message
 256  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 257  * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
 258  *
 259  * Registers the specified function pointers (at least one of them has
 260  * to be non-NULL) to be called whenever a request message for the
 261  * specified protocol family and message type is received.
 262  *
 263  * The special protocol family PF_UNSPEC may be used to define fallback
 264  * function pointers for the case when no entry for the specific protocol
 265  * family exists.
 266  */
 267 void rtnl_register(int protocol, int msgtype,
 268                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 269                    unsigned int flags)
 270 {
 271         int err;
 272 
 273         err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit,
 274                                      flags);
 275         if (err)
 276                 pr_err("Unable to register rtnetlink message handler, "
 277                        "protocol = %d, message type = %d\n", protocol, msgtype);
 278 }
 279 
 280 /**
 281  * rtnl_unregister - Unregister a rtnetlink message type
 282  * @protocol: Protocol family or PF_UNSPEC
 283  * @msgtype: rtnetlink message type
 284  *
 285  * Returns 0 on success or a negative error code.
 286  */
 287 int rtnl_unregister(int protocol, int msgtype)
 288 {
 289         struct rtnl_link **tab, *link;
 290         int msgindex;
 291 
 292         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 293         msgindex = rtm_msgindex(msgtype);
 294 
 295         rtnl_lock();
 296         tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
 297         if (!tab) {
 298                 rtnl_unlock();
 299                 return -ENOENT;
 300         }
 301 
 302         link = tab[msgindex];
 303         rcu_assign_pointer(tab[msgindex], NULL);
 304         rtnl_unlock();
 305 
 306         kfree_rcu(link, rcu);
 307 
 308         return 0;
 309 }
 310 EXPORT_SYMBOL_GPL(rtnl_unregister);
 311 
 312 /**
 313  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 314  * @protocol : Protocol family or PF_UNSPEC
 315  *
 316  * Identical to calling rtnl_unregster() for all registered message types
 317  * of a certain protocol family.
 318  */
 319 void rtnl_unregister_all(int protocol)
 320 {
 321         struct rtnl_link **tab, *link;
 322         int msgindex;
 323 
 324         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 325 
 326         rtnl_lock();
 327         tab = rtnl_msg_handlers[protocol];
 328         if (!tab) {
 329                 rtnl_unlock();
 330                 return;
 331         }
 332         RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
 333         for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
 334                 link = tab[msgindex];
 335                 if (!link)
 336                         continue;
 337 
 338                 rcu_assign_pointer(tab[msgindex], NULL);
 339                 kfree_rcu(link, rcu);
 340         }
 341         rtnl_unlock();
 342 
 343         synchronize_net();
 344 
 345         kfree(tab);
 346 }
 347 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 348 
 349 static LIST_HEAD(link_ops);
 350 
 351 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 352 {
 353         const struct rtnl_link_ops *ops;
 354 
 355         list_for_each_entry(ops, &link_ops, list) {
 356                 if (!strcmp(ops->kind, kind))
 357                         return ops;
 358         }
 359         return NULL;
 360 }
 361 
 362 /**
 363  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 364  * @ops: struct rtnl_link_ops * to register
 365  *
 366  * The caller must hold the rtnl_mutex. This function should be used
 367  * by drivers that create devices during module initialization. It
 368  * must be called before registering the devices.
 369  *
 370  * Returns 0 on success or a negative error code.
 371  */
 372 int __rtnl_link_register(struct rtnl_link_ops *ops)
 373 {
 374         if (rtnl_link_ops_get(ops->kind))
 375                 return -EEXIST;
 376 
 377         /* The check for setup is here because if ops
 378          * does not have that filled up, it is not possible
 379          * to use the ops for creating device. So do not
 380          * fill up dellink as well. That disables rtnl_dellink.
 381          */
 382         if (ops->setup && !ops->dellink)
 383                 ops->dellink = unregister_netdevice_queue;
 384 
 385         list_add_tail(&ops->list, &link_ops);
 386         return 0;
 387 }
 388 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 389 
 390 /**
 391  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 392  * @ops: struct rtnl_link_ops * to register
 393  *
 394  * Returns 0 on success or a negative error code.
 395  */
 396 int rtnl_link_register(struct rtnl_link_ops *ops)
 397 {
 398         int err;
 399 
 400         /* Sanity-check max sizes to avoid stack buffer overflow. */
 401         if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE ||
 402                     ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE))
 403                 return -EINVAL;
 404 
 405         rtnl_lock();
 406         err = __rtnl_link_register(ops);
 407         rtnl_unlock();
 408         return err;
 409 }
 410 EXPORT_SYMBOL_GPL(rtnl_link_register);
 411 
 412 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 413 {
 414         struct net_device *dev;
 415         LIST_HEAD(list_kill);
 416 
 417         for_each_netdev(net, dev) {
 418                 if (dev->rtnl_link_ops == ops)
 419                         ops->dellink(dev, &list_kill);
 420         }
 421         unregister_netdevice_many(&list_kill);
 422 }
 423 
 424 /**
 425  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 426  * @ops: struct rtnl_link_ops * to unregister
 427  *
 428  * The caller must hold the rtnl_mutex and guarantee net_namespace_list
 429  * integrity (hold pernet_ops_rwsem for writing to close the race
 430  * with setup_net() and cleanup_net()).
 431  */
 432 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 433 {
 434         struct net *net;
 435 
 436         for_each_net(net) {
 437                 __rtnl_kill_links(net, ops);
 438         }
 439         list_del(&ops->list);
 440 }
 441 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 442 
 443 /* Return with the rtnl_lock held when there are no network
 444  * devices unregistering in any network namespace.
 445  */
 446 static void rtnl_lock_unregistering_all(void)
 447 {
 448         struct net *net;
 449         bool unregistering;
 450         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 451 
 452         add_wait_queue(&netdev_unregistering_wq, &wait);
 453         for (;;) {
 454                 unregistering = false;
 455                 rtnl_lock();
 456                 /* We held write locked pernet_ops_rwsem, and parallel
 457                  * setup_net() and cleanup_net() are not possible.
 458                  */
 459                 for_each_net(net) {
 460                         if (net->dev_unreg_count > 0) {
 461                                 unregistering = true;
 462                                 break;
 463                         }
 464                 }
 465                 if (!unregistering)
 466                         break;
 467                 __rtnl_unlock();
 468 
 469                 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
 470         }
 471         remove_wait_queue(&netdev_unregistering_wq, &wait);
 472 }
 473 
 474 /**
 475  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 476  * @ops: struct rtnl_link_ops * to unregister
 477  */
 478 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 479 {
 480         /* Close the race with setup_net() and cleanup_net() */
 481         down_write(&pernet_ops_rwsem);
 482         rtnl_lock_unregistering_all();
 483         __rtnl_link_unregister(ops);
 484         rtnl_unlock();
 485         up_write(&pernet_ops_rwsem);
 486 }
 487 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 488 
 489 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 490 {
 491         struct net_device *master_dev;
 492         const struct rtnl_link_ops *ops;
 493         size_t size = 0;
 494 
 495         rcu_read_lock();
 496 
 497         master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
 498         if (!master_dev)
 499                 goto out;
 500 
 501         ops = master_dev->rtnl_link_ops;
 502         if (!ops || !ops->get_slave_size)
 503                 goto out;
 504         /* IFLA_INFO_SLAVE_DATA + nested data */
 505         size = nla_total_size(sizeof(struct nlattr)) +
 506                ops->get_slave_size(master_dev, dev);
 507 
 508 out:
 509         rcu_read_unlock();
 510         return size;
 511 }
 512 
 513 static size_t rtnl_link_get_size(const struct net_device *dev)
 514 {
 515         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 516         size_t size;
 517 
 518         if (!ops)
 519                 return 0;
 520 
 521         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 522                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 523 
 524         if (ops->get_size)
 525                 /* IFLA_INFO_DATA + nested data */
 526                 size += nla_total_size(sizeof(struct nlattr)) +
 527                         ops->get_size(dev);
 528 
 529         if (ops->get_xstats_size)
 530                 /* IFLA_INFO_XSTATS */
 531                 size += nla_total_size(ops->get_xstats_size(dev));
 532 
 533         size += rtnl_link_get_slave_info_data_size(dev);
 534 
 535         return size;
 536 }
 537 
 538 static LIST_HEAD(rtnl_af_ops);
 539 
 540 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 541 {
 542         const struct rtnl_af_ops *ops;
 543 
 544         list_for_each_entry_rcu(ops, &rtnl_af_ops, list) {
 545                 if (ops->family == family)
 546                         return ops;
 547         }
 548 
 549         return NULL;
 550 }
 551 
 552 /**
 553  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 554  * @ops: struct rtnl_af_ops * to register
 555  *
 556  * Returns 0 on success or a negative error code.
 557  */
 558 void rtnl_af_register(struct rtnl_af_ops *ops)
 559 {
 560         rtnl_lock();
 561         list_add_tail_rcu(&ops->list, &rtnl_af_ops);
 562         rtnl_unlock();
 563 }
 564 EXPORT_SYMBOL_GPL(rtnl_af_register);
 565 
 566 /**
 567  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 568  * @ops: struct rtnl_af_ops * to unregister
 569  */
 570 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 571 {
 572         rtnl_lock();
 573         list_del_rcu(&ops->list);
 574         rtnl_unlock();
 575 
 576         synchronize_rcu();
 577 }
 578 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 579 
 580 static size_t rtnl_link_get_af_size(const struct net_device *dev,
 581                                     u32 ext_filter_mask)
 582 {
 583         struct rtnl_af_ops *af_ops;
 584         size_t size;
 585 
 586         /* IFLA_AF_SPEC */
 587         size = nla_total_size(sizeof(struct nlattr));
 588 
 589         rcu_read_lock();
 590         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
 591                 if (af_ops->get_link_af_size) {
 592                         /* AF_* + nested data */
 593                         size += nla_total_size(sizeof(struct nlattr)) +
 594                                 af_ops->get_link_af_size(dev, ext_filter_mask);
 595                 }
 596         }
 597         rcu_read_unlock();
 598 
 599         return size;
 600 }
 601 
 602 static bool rtnl_have_link_slave_info(const struct net_device *dev)
 603 {
 604         struct net_device *master_dev;
 605         bool ret = false;
 606 
 607         rcu_read_lock();
 608 
 609         master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
 610         if (master_dev && master_dev->rtnl_link_ops)
 611                 ret = true;
 612         rcu_read_unlock();
 613         return ret;
 614 }
 615 
 616 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
 617                                      const struct net_device *dev)
 618 {
 619         struct net_device *master_dev;
 620         const struct rtnl_link_ops *ops;
 621         struct nlattr *slave_data;
 622         int err;
 623 
 624         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 625         if (!master_dev)
 626                 return 0;
 627         ops = master_dev->rtnl_link_ops;
 628         if (!ops)
 629                 return 0;
 630         if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
 631                 return -EMSGSIZE;
 632         if (ops->fill_slave_info) {
 633                 slave_data = nla_nest_start_noflag(skb, IFLA_INFO_SLAVE_DATA);
 634                 if (!slave_data)
 635                         return -EMSGSIZE;
 636                 err = ops->fill_slave_info(skb, master_dev, dev);
 637                 if (err < 0)
 638                         goto err_cancel_slave_data;
 639                 nla_nest_end(skb, slave_data);
 640         }
 641         return 0;
 642 
 643 err_cancel_slave_data:
 644         nla_nest_cancel(skb, slave_data);
 645         return err;
 646 }
 647 
 648 static int rtnl_link_info_fill(struct sk_buff *skb,
 649                                const struct net_device *dev)
 650 {
 651         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 652         struct nlattr *data;
 653         int err;
 654 
 655         if (!ops)
 656                 return 0;
 657         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 658                 return -EMSGSIZE;
 659         if (ops->fill_xstats) {
 660                 err = ops->fill_xstats(skb, dev);
 661                 if (err < 0)
 662                         return err;
 663         }
 664         if (ops->fill_info) {
 665                 data = nla_nest_start_noflag(skb, IFLA_INFO_DATA);
 666                 if (data == NULL)
 667                         return -EMSGSIZE;
 668                 err = ops->fill_info(skb, dev);
 669                 if (err < 0)
 670                         goto err_cancel_data;
 671                 nla_nest_end(skb, data);
 672         }
 673         return 0;
 674 
 675 err_cancel_data:
 676         nla_nest_cancel(skb, data);
 677         return err;
 678 }
 679 
 680 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 681 {
 682         struct nlattr *linkinfo;
 683         int err = -EMSGSIZE;
 684 
 685         linkinfo = nla_nest_start_noflag(skb, IFLA_LINKINFO);
 686         if (linkinfo == NULL)
 687                 goto out;
 688 
 689         err = rtnl_link_info_fill(skb, dev);
 690         if (err < 0)
 691                 goto err_cancel_link;
 692 
 693         err = rtnl_link_slave_info_fill(skb, dev);
 694         if (err < 0)
 695                 goto err_cancel_link;
 696 
 697         nla_nest_end(skb, linkinfo);
 698         return 0;
 699 
 700 err_cancel_link:
 701         nla_nest_cancel(skb, linkinfo);
 702 out:
 703         return err;
 704 }
 705 
 706 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 707 {
 708         struct sock *rtnl = net->rtnl;
 709         int err = 0;
 710 
 711         NETLINK_CB(skb).dst_group = group;
 712         if (echo)
 713                 refcount_inc(&skb->users);
 714         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 715         if (echo)
 716                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 717         return err;
 718 }
 719 
 720 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 721 {
 722         struct sock *rtnl = net->rtnl;
 723 
 724         return nlmsg_unicast(rtnl, skb, pid);
 725 }
 726 EXPORT_SYMBOL(rtnl_unicast);
 727 
 728 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 729                  struct nlmsghdr *nlh, gfp_t flags)
 730 {
 731         struct sock *rtnl = net->rtnl;
 732         int report = 0;
 733 
 734         if (nlh)
 735                 report = nlmsg_report(nlh);
 736 
 737         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 738 }
 739 EXPORT_SYMBOL(rtnl_notify);
 740 
 741 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 742 {
 743         struct sock *rtnl = net->rtnl;
 744 
 745         netlink_set_err(rtnl, 0, group, error);
 746 }
 747 EXPORT_SYMBOL(rtnl_set_sk_err);
 748 
 749 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 750 {
 751         struct nlattr *mx;
 752         int i, valid = 0;
 753 
 754         /* nothing is dumped for dst_default_metrics, so just skip the loop */
 755         if (metrics == dst_default_metrics.metrics)
 756                 return 0;
 757 
 758         mx = nla_nest_start_noflag(skb, RTA_METRICS);
 759         if (mx == NULL)
 760                 return -ENOBUFS;
 761 
 762         for (i = 0; i < RTAX_MAX; i++) {
 763                 if (metrics[i]) {
 764                         if (i == RTAX_CC_ALGO - 1) {
 765                                 char tmp[TCP_CA_NAME_MAX], *name;
 766 
 767                                 name = tcp_ca_get_name_by_key(metrics[i], tmp);
 768                                 if (!name)
 769                                         continue;
 770                                 if (nla_put_string(skb, i + 1, name))
 771                                         goto nla_put_failure;
 772                         } else if (i == RTAX_FEATURES - 1) {
 773                                 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
 774 
 775                                 if (!user_features)
 776                                         continue;
 777                                 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
 778                                 if (nla_put_u32(skb, i + 1, user_features))
 779                                         goto nla_put_failure;
 780                         } else {
 781                                 if (nla_put_u32(skb, i + 1, metrics[i]))
 782                                         goto nla_put_failure;
 783                         }
 784                         valid++;
 785                 }
 786         }
 787 
 788         if (!valid) {
 789                 nla_nest_cancel(skb, mx);
 790                 return 0;
 791         }
 792 
 793         return nla_nest_end(skb, mx);
 794 
 795 nla_put_failure:
 796         nla_nest_cancel(skb, mx);
 797         return -EMSGSIZE;
 798 }
 799 EXPORT_SYMBOL(rtnetlink_put_metrics);
 800 
 801 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 802                        long expires, u32 error)
 803 {
 804         struct rta_cacheinfo ci = {
 805                 .rta_error = error,
 806                 .rta_id =  id,
 807         };
 808 
 809         if (dst) {
 810                 ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse);
 811                 ci.rta_used = dst->__use;
 812                 ci.rta_clntref = atomic_read(&dst->__refcnt);
 813         }
 814         if (expires) {
 815                 unsigned long clock;
 816 
 817                 clock = jiffies_to_clock_t(abs(expires));
 818                 clock = min_t(unsigned long, clock, INT_MAX);
 819                 ci.rta_expires = (expires > 0) ? clock : -clock;
 820         }
 821         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 822 }
 823 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 824 
 825 static void set_operstate(struct net_device *dev, unsigned char transition)
 826 {
 827         unsigned char operstate = dev->operstate;
 828 
 829         switch (transition) {
 830         case IF_OPER_UP:
 831                 if ((operstate == IF_OPER_DORMANT ||
 832                      operstate == IF_OPER_UNKNOWN) &&
 833                     !netif_dormant(dev))
 834                         operstate = IF_OPER_UP;
 835                 break;
 836 
 837         case IF_OPER_DORMANT:
 838                 if (operstate == IF_OPER_UP ||
 839                     operstate == IF_OPER_UNKNOWN)
 840                         operstate = IF_OPER_DORMANT;
 841                 break;
 842         }
 843 
 844         if (dev->operstate != operstate) {
 845                 write_lock_bh(&dev_base_lock);
 846                 dev->operstate = operstate;
 847                 write_unlock_bh(&dev_base_lock);
 848                 netdev_state_change(dev);
 849         }
 850 }
 851 
 852 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 853 {
 854         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 855                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 856 }
 857 
 858 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 859                                            const struct ifinfomsg *ifm)
 860 {
 861         unsigned int flags = ifm->ifi_flags;
 862 
 863         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 864         if (ifm->ifi_change)
 865                 flags = (flags & ifm->ifi_change) |
 866                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 867 
 868         return flags;
 869 }
 870 
 871 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 872                                  const struct rtnl_link_stats64 *b)
 873 {
 874         a->rx_packets = b->rx_packets;
 875         a->tx_packets = b->tx_packets;
 876         a->rx_bytes = b->rx_bytes;
 877         a->tx_bytes = b->tx_bytes;
 878         a->rx_errors = b->rx_errors;
 879         a->tx_errors = b->tx_errors;
 880         a->rx_dropped = b->rx_dropped;
 881         a->tx_dropped = b->tx_dropped;
 882 
 883         a->multicast = b->multicast;
 884         a->collisions = b->collisions;
 885 
 886         a->rx_length_errors = b->rx_length_errors;
 887         a->rx_over_errors = b->rx_over_errors;
 888         a->rx_crc_errors = b->rx_crc_errors;
 889         a->rx_frame_errors = b->rx_frame_errors;
 890         a->rx_fifo_errors = b->rx_fifo_errors;
 891         a->rx_missed_errors = b->rx_missed_errors;
 892 
 893         a->tx_aborted_errors = b->tx_aborted_errors;
 894         a->tx_carrier_errors = b->tx_carrier_errors;
 895         a->tx_fifo_errors = b->tx_fifo_errors;
 896         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 897         a->tx_window_errors = b->tx_window_errors;
 898 
 899         a->rx_compressed = b->rx_compressed;
 900         a->tx_compressed = b->tx_compressed;
 901 
 902         a->rx_nohandler = b->rx_nohandler;
 903 }
 904 
 905 /* All VF info */
 906 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 907                                    u32 ext_filter_mask)
 908 {
 909         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
 910                 int num_vfs = dev_num_vf(dev->dev.parent);
 911                 size_t size = nla_total_size(0);
 912                 size += num_vfs *
 913                         (nla_total_size(0) +
 914                          nla_total_size(sizeof(struct ifla_vf_mac)) +
 915                          nla_total_size(sizeof(struct ifla_vf_broadcast)) +
 916                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 917                          nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
 918                          nla_total_size(MAX_VLAN_LIST_LEN *
 919                                         sizeof(struct ifla_vf_vlan_info)) +
 920                          nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 921                          nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
 922                          nla_total_size(sizeof(struct ifla_vf_rate)) +
 923                          nla_total_size(sizeof(struct ifla_vf_link_state)) +
 924                          nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
 925                          nla_total_size(0) + /* nest IFLA_VF_STATS */
 926                          /* IFLA_VF_STATS_RX_PACKETS */
 927                          nla_total_size_64bit(sizeof(__u64)) +
 928                          /* IFLA_VF_STATS_TX_PACKETS */
 929                          nla_total_size_64bit(sizeof(__u64)) +
 930                          /* IFLA_VF_STATS_RX_BYTES */
 931                          nla_total_size_64bit(sizeof(__u64)) +
 932                          /* IFLA_VF_STATS_TX_BYTES */
 933                          nla_total_size_64bit(sizeof(__u64)) +
 934                          /* IFLA_VF_STATS_BROADCAST */
 935                          nla_total_size_64bit(sizeof(__u64)) +
 936                          /* IFLA_VF_STATS_MULTICAST */
 937                          nla_total_size_64bit(sizeof(__u64)) +
 938                          /* IFLA_VF_STATS_RX_DROPPED */
 939                          nla_total_size_64bit(sizeof(__u64)) +
 940                          /* IFLA_VF_STATS_TX_DROPPED */
 941                          nla_total_size_64bit(sizeof(__u64)) +
 942                          nla_total_size(sizeof(struct ifla_vf_trust)));
 943                 return size;
 944         } else
 945                 return 0;
 946 }
 947 
 948 static size_t rtnl_port_size(const struct net_device *dev,
 949                              u32 ext_filter_mask)
 950 {
 951         size_t port_size = nla_total_size(4)            /* PORT_VF */
 952                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 953                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 954                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 955                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 956                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 957         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 958         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 959                 + port_size;
 960         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 961                 + port_size;
 962 
 963         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 964             !(ext_filter_mask & RTEXT_FILTER_VF))
 965                 return 0;
 966         if (dev_num_vf(dev->dev.parent))
 967                 return port_self_size + vf_ports_size +
 968                         vf_port_size * dev_num_vf(dev->dev.parent);
 969         else
 970                 return port_self_size;
 971 }
 972 
 973 static size_t rtnl_xdp_size(void)
 974 {
 975         size_t xdp_size = nla_total_size(0) +   /* nest IFLA_XDP */
 976                           nla_total_size(1) +   /* XDP_ATTACHED */
 977                           nla_total_size(4) +   /* XDP_PROG_ID (or 1st mode) */
 978                           nla_total_size(4);    /* XDP_<mode>_PROG_ID */
 979 
 980         return xdp_size;
 981 }
 982 
 983 static noinline size_t if_nlmsg_size(const struct net_device *dev,
 984                                      u32 ext_filter_mask)
 985 {
 986         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 987                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 988                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 989                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 990                + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
 991                + nla_total_size(sizeof(struct rtnl_link_stats))
 992                + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
 993                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 994                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 995                + nla_total_size(4) /* IFLA_TXQLEN */
 996                + nla_total_size(4) /* IFLA_WEIGHT */
 997                + nla_total_size(4) /* IFLA_MTU */
 998                + nla_total_size(4) /* IFLA_LINK */
 999                + nla_total_size(4) /* IFLA_MASTER */
1000                + nla_total_size(1) /* IFLA_CARRIER */
1001                + nla_total_size(4) /* IFLA_PROMISCUITY */
1002                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
1003                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
1004                + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
1005                + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
1006                + nla_total_size(1) /* IFLA_OPERSTATE */
1007                + nla_total_size(1) /* IFLA_LINKMODE */
1008                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
1009                + nla_total_size(4) /* IFLA_LINK_NETNSID */
1010                + nla_total_size(4) /* IFLA_GROUP */
1011                + nla_total_size(ext_filter_mask
1012                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
1013                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
1014                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
1015                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
1016                + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
1017                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
1018                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
1019                + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
1020                + rtnl_xdp_size() /* IFLA_XDP */
1021                + nla_total_size(4)  /* IFLA_EVENT */
1022                + nla_total_size(4)  /* IFLA_NEW_NETNSID */
1023                + nla_total_size(4)  /* IFLA_NEW_IFINDEX */
1024                + nla_total_size(1)  /* IFLA_PROTO_DOWN */
1025                + nla_total_size(4)  /* IFLA_TARGET_NETNSID */
1026                + nla_total_size(4)  /* IFLA_CARRIER_UP_COUNT */
1027                + nla_total_size(4)  /* IFLA_CARRIER_DOWN_COUNT */
1028                + nla_total_size(4)  /* IFLA_MIN_MTU */
1029                + nla_total_size(4)  /* IFLA_MAX_MTU */
1030                + 0;
1031 }
1032 
1033 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
1034 {
1035         struct nlattr *vf_ports;
1036         struct nlattr *vf_port;
1037         int vf;
1038         int err;
1039 
1040         vf_ports = nla_nest_start_noflag(skb, IFLA_VF_PORTS);
1041         if (!vf_ports)
1042                 return -EMSGSIZE;
1043 
1044         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
1045                 vf_port = nla_nest_start_noflag(skb, IFLA_VF_PORT);
1046                 if (!vf_port)
1047                         goto nla_put_failure;
1048                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
1049                         goto nla_put_failure;
1050                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
1051                 if (err == -EMSGSIZE)
1052                         goto nla_put_failure;
1053                 if (err) {
1054                         nla_nest_cancel(skb, vf_port);
1055                         continue;
1056                 }
1057                 nla_nest_end(skb, vf_port);
1058         }
1059 
1060         nla_nest_end(skb, vf_ports);
1061 
1062         return 0;
1063 
1064 nla_put_failure:
1065         nla_nest_cancel(skb, vf_ports);
1066         return -EMSGSIZE;
1067 }
1068 
1069 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
1070 {
1071         struct nlattr *port_self;
1072         int err;
1073 
1074         port_self = nla_nest_start_noflag(skb, IFLA_PORT_SELF);
1075         if (!port_self)
1076                 return -EMSGSIZE;
1077 
1078         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
1079         if (err) {
1080                 nla_nest_cancel(skb, port_self);
1081                 return (err == -EMSGSIZE) ? err : 0;
1082         }
1083 
1084         nla_nest_end(skb, port_self);
1085 
1086         return 0;
1087 }
1088 
1089 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1090                           u32 ext_filter_mask)
1091 {
1092         int err;
1093 
1094         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1095             !(ext_filter_mask & RTEXT_FILTER_VF))
1096                 return 0;
1097 
1098         err = rtnl_port_self_fill(skb, dev);
1099         if (err)
1100                 return err;
1101 
1102         if (dev_num_vf(dev->dev.parent)) {
1103                 err = rtnl_vf_ports_fill(skb, dev);
1104                 if (err)
1105                         return err;
1106         }
1107 
1108         return 0;
1109 }
1110 
1111 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1112 {
1113         int err;
1114         struct netdev_phys_item_id ppid;
1115 
1116         err = dev_get_phys_port_id(dev, &ppid);
1117         if (err) {
1118                 if (err == -EOPNOTSUPP)
1119                         return 0;
1120                 return err;
1121         }
1122 
1123         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1124                 return -EMSGSIZE;
1125 
1126         return 0;
1127 }
1128 
1129 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1130 {
1131         char name[IFNAMSIZ];
1132         int err;
1133 
1134         err = dev_get_phys_port_name(dev, name, sizeof(name));
1135         if (err) {
1136                 if (err == -EOPNOTSUPP)
1137                         return 0;
1138                 return err;
1139         }
1140 
1141         if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1142                 return -EMSGSIZE;
1143 
1144         return 0;
1145 }
1146 
1147 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1148 {
1149         struct netdev_phys_item_id ppid = { };
1150         int err;
1151 
1152         err = dev_get_port_parent_id(dev, &ppid, false);
1153         if (err) {
1154                 if (err == -EOPNOTSUPP)
1155                         return 0;
1156                 return err;
1157         }
1158 
1159         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id))
1160                 return -EMSGSIZE;
1161 
1162         return 0;
1163 }
1164 
1165 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1166                                               struct net_device *dev)
1167 {
1168         struct rtnl_link_stats64 *sp;
1169         struct nlattr *attr;
1170 
1171         attr = nla_reserve_64bit(skb, IFLA_STATS64,
1172                                  sizeof(struct rtnl_link_stats64), IFLA_PAD);
1173         if (!attr)
1174                 return -EMSGSIZE;
1175 
1176         sp = nla_data(attr);
1177         dev_get_stats(dev, sp);
1178 
1179         attr = nla_reserve(skb, IFLA_STATS,
1180                            sizeof(struct rtnl_link_stats));
1181         if (!attr)
1182                 return -EMSGSIZE;
1183 
1184         copy_rtnl_link_stats(nla_data(attr), sp);
1185 
1186         return 0;
1187 }
1188 
1189 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1190                                                struct net_device *dev,
1191                                                int vfs_num,
1192                                                struct nlattr *vfinfo)
1193 {
1194         struct ifla_vf_rss_query_en vf_rss_query_en;
1195         struct nlattr *vf, *vfstats, *vfvlanlist;
1196         struct ifla_vf_link_state vf_linkstate;
1197         struct ifla_vf_vlan_info vf_vlan_info;
1198         struct ifla_vf_spoofchk vf_spoofchk;
1199         struct ifla_vf_tx_rate vf_tx_rate;
1200         struct ifla_vf_stats vf_stats;
1201         struct ifla_vf_trust vf_trust;
1202         struct ifla_vf_vlan vf_vlan;
1203         struct ifla_vf_rate vf_rate;
1204         struct ifla_vf_mac vf_mac;
1205         struct ifla_vf_broadcast vf_broadcast;
1206         struct ifla_vf_info ivi;
1207 
1208         memset(&ivi, 0, sizeof(ivi));
1209 
1210         /* Not all SR-IOV capable drivers support the
1211          * spoofcheck and "RSS query enable" query.  Preset to
1212          * -1 so the user space tool can detect that the driver
1213          * didn't report anything.
1214          */
1215         ivi.spoofchk = -1;
1216         ivi.rss_query_en = -1;
1217         ivi.trusted = -1;
1218         /* The default value for VF link state is "auto"
1219          * IFLA_VF_LINK_STATE_AUTO which equals zero
1220          */
1221         ivi.linkstate = 0;
1222         /* VLAN Protocol by default is 802.1Q */
1223         ivi.vlan_proto = htons(ETH_P_8021Q);
1224         if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1225                 return 0;
1226 
1227         memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1228 
1229         vf_mac.vf =
1230                 vf_vlan.vf =
1231                 vf_vlan_info.vf =
1232                 vf_rate.vf =
1233                 vf_tx_rate.vf =
1234                 vf_spoofchk.vf =
1235                 vf_linkstate.vf =
1236                 vf_rss_query_en.vf =
1237                 vf_trust.vf = ivi.vf;
1238 
1239         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1240         memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len);
1241         vf_vlan.vlan = ivi.vlan;
1242         vf_vlan.qos = ivi.qos;
1243         vf_vlan_info.vlan = ivi.vlan;
1244         vf_vlan_info.qos = ivi.qos;
1245         vf_vlan_info.vlan_proto = ivi.vlan_proto;
1246         vf_tx_rate.rate = ivi.max_tx_rate;
1247         vf_rate.min_tx_rate = ivi.min_tx_rate;
1248         vf_rate.max_tx_rate = ivi.max_tx_rate;
1249         vf_spoofchk.setting = ivi.spoofchk;
1250         vf_linkstate.link_state = ivi.linkstate;
1251         vf_rss_query_en.setting = ivi.rss_query_en;
1252         vf_trust.setting = ivi.trusted;
1253         vf = nla_nest_start_noflag(skb, IFLA_VF_INFO);
1254         if (!vf)
1255                 goto nla_put_vfinfo_failure;
1256         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1257             nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) ||
1258             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1259             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1260                     &vf_rate) ||
1261             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1262                     &vf_tx_rate) ||
1263             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1264                     &vf_spoofchk) ||
1265             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1266                     &vf_linkstate) ||
1267             nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1268                     sizeof(vf_rss_query_en),
1269                     &vf_rss_query_en) ||
1270             nla_put(skb, IFLA_VF_TRUST,
1271                     sizeof(vf_trust), &vf_trust))
1272                 goto nla_put_vf_failure;
1273         vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST);
1274         if (!vfvlanlist)
1275                 goto nla_put_vf_failure;
1276         if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1277                     &vf_vlan_info)) {
1278                 nla_nest_cancel(skb, vfvlanlist);
1279                 goto nla_put_vf_failure;
1280         }
1281         nla_nest_end(skb, vfvlanlist);
1282         memset(&vf_stats, 0, sizeof(vf_stats));
1283         if (dev->netdev_ops->ndo_get_vf_stats)
1284                 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1285                                                 &vf_stats);
1286         vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS);
1287         if (!vfstats)
1288                 goto nla_put_vf_failure;
1289         if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1290                               vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1291             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1292                               vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1293             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1294                               vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1295             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1296                               vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1297             nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1298                               vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1299             nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1300                               vf_stats.multicast, IFLA_VF_STATS_PAD) ||
1301             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
1302                               vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
1303             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
1304                               vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
1305                 nla_nest_cancel(skb, vfstats);
1306                 goto nla_put_vf_failure;
1307         }
1308         nla_nest_end(skb, vfstats);
1309         nla_nest_end(skb, vf);
1310         return 0;
1311 
1312 nla_put_vf_failure:
1313         nla_nest_cancel(skb, vf);
1314 nla_put_vfinfo_failure:
1315         nla_nest_cancel(skb, vfinfo);
1316         return -EMSGSIZE;
1317 }
1318 
1319 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1320                                            struct net_device *dev,
1321                                            u32 ext_filter_mask)
1322 {
1323         struct nlattr *vfinfo;
1324         int i, num_vfs;
1325 
1326         if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1327                 return 0;
1328 
1329         num_vfs = dev_num_vf(dev->dev.parent);
1330         if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1331                 return -EMSGSIZE;
1332 
1333         if (!dev->netdev_ops->ndo_get_vf_config)
1334                 return 0;
1335 
1336         vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST);
1337         if (!vfinfo)
1338                 return -EMSGSIZE;
1339 
1340         for (i = 0; i < num_vfs; i++) {
1341                 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1342                         return -EMSGSIZE;
1343         }
1344 
1345         nla_nest_end(skb, vfinfo);
1346         return 0;
1347 }
1348 
1349 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1350 {
1351         struct rtnl_link_ifmap map;
1352 
1353         memset(&map, 0, sizeof(map));
1354         map.mem_start   = dev->mem_start;
1355         map.mem_end     = dev->mem_end;
1356         map.base_addr   = dev->base_addr;
1357         map.irq         = dev->irq;
1358         map.dma         = dev->dma;
1359         map.port        = dev->if_port;
1360 
1361         if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1362                 return -EMSGSIZE;
1363 
1364         return 0;
1365 }
1366 
1367 static u32 rtnl_xdp_prog_skb(struct net_device *dev)
1368 {
1369         const struct bpf_prog *generic_xdp_prog;
1370 
1371         ASSERT_RTNL();
1372 
1373         generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1374         if (!generic_xdp_prog)
1375                 return 0;
1376         return generic_xdp_prog->aux->id;
1377 }
1378 
1379 static u32 rtnl_xdp_prog_drv(struct net_device *dev)
1380 {
1381         return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf, XDP_QUERY_PROG);
1382 }
1383 
1384 static u32 rtnl_xdp_prog_hw(struct net_device *dev)
1385 {
1386         return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf,
1387                                XDP_QUERY_PROG_HW);
1388 }
1389 
1390 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
1391                                u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
1392                                u32 (*get_prog_id)(struct net_device *dev))
1393 {
1394         u32 curr_id;
1395         int err;
1396 
1397         curr_id = get_prog_id(dev);
1398         if (!curr_id)
1399                 return 0;
1400 
1401         *prog_id = curr_id;
1402         err = nla_put_u32(skb, attr, curr_id);
1403         if (err)
1404                 return err;
1405 
1406         if (*mode != XDP_ATTACHED_NONE)
1407                 *mode = XDP_ATTACHED_MULTI;
1408         else
1409                 *mode = tgt_mode;
1410 
1411         return 0;
1412 }
1413 
1414 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1415 {
1416         struct nlattr *xdp;
1417         u32 prog_id;
1418         int err;
1419         u8 mode;
1420 
1421         xdp = nla_nest_start_noflag(skb, IFLA_XDP);
1422         if (!xdp)
1423                 return -EMSGSIZE;
1424 
1425         prog_id = 0;
1426         mode = XDP_ATTACHED_NONE;
1427         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
1428                                   IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
1429         if (err)
1430                 goto err_cancel;
1431         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
1432                                   IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
1433         if (err)
1434                 goto err_cancel;
1435         err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
1436                                   IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
1437         if (err)
1438                 goto err_cancel;
1439 
1440         err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
1441         if (err)
1442                 goto err_cancel;
1443 
1444         if (prog_id && mode != XDP_ATTACHED_MULTI) {
1445                 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1446                 if (err)
1447                         goto err_cancel;
1448         }
1449 
1450         nla_nest_end(skb, xdp);
1451         return 0;
1452 
1453 err_cancel:
1454         nla_nest_cancel(skb, xdp);
1455         return err;
1456 }
1457 
1458 static u32 rtnl_get_event(unsigned long event)
1459 {
1460         u32 rtnl_event_type = IFLA_EVENT_NONE;
1461 
1462         switch (event) {
1463         case NETDEV_REBOOT:
1464                 rtnl_event_type = IFLA_EVENT_REBOOT;
1465                 break;
1466         case NETDEV_FEAT_CHANGE:
1467                 rtnl_event_type = IFLA_EVENT_FEATURES;
1468                 break;
1469         case NETDEV_BONDING_FAILOVER:
1470                 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1471                 break;
1472         case NETDEV_NOTIFY_PEERS:
1473                 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1474                 break;
1475         case NETDEV_RESEND_IGMP:
1476                 rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1477                 break;
1478         case NETDEV_CHANGEINFODATA:
1479                 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1480                 break;
1481         default:
1482                 break;
1483         }
1484 
1485         return rtnl_event_type;
1486 }
1487 
1488 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1489 {
1490         const struct net_device *upper_dev;
1491         int ret = 0;
1492 
1493         rcu_read_lock();
1494 
1495         upper_dev = netdev_master_upper_dev_get_rcu(dev);
1496         if (upper_dev)
1497                 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1498 
1499         rcu_read_unlock();
1500         return ret;
1501 }
1502 
1503 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
1504                           bool force)
1505 {
1506         int ifindex = dev_get_iflink(dev);
1507 
1508         if (force || dev->ifindex != ifindex)
1509                 return nla_put_u32(skb, IFLA_LINK, ifindex);
1510 
1511         return 0;
1512 }
1513 
1514 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1515                                               struct net_device *dev)
1516 {
1517         char buf[IFALIASZ];
1518         int ret;
1519 
1520         ret = dev_get_alias(dev, buf, sizeof(buf));
1521         return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1522 }
1523 
1524 static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1525                                   const struct net_device *dev,
1526                                   struct net *src_net, gfp_t gfp)
1527 {
1528         bool put_iflink = false;
1529 
1530         if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1531                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1532 
1533                 if (!net_eq(dev_net(dev), link_net)) {
1534                         int id = peernet2id_alloc(src_net, link_net, gfp);
1535 
1536                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1537                                 return -EMSGSIZE;
1538 
1539                         put_iflink = true;
1540                 }
1541         }
1542 
1543         return nla_put_iflink(skb, dev, put_iflink);
1544 }
1545 
1546 static int rtnl_fill_link_af(struct sk_buff *skb,
1547                              const struct net_device *dev,
1548                              u32 ext_filter_mask)
1549 {
1550         const struct rtnl_af_ops *af_ops;
1551         struct nlattr *af_spec;
1552 
1553         af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
1554         if (!af_spec)
1555                 return -EMSGSIZE;
1556 
1557         list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1558                 struct nlattr *af;
1559                 int err;
1560 
1561                 if (!af_ops->fill_link_af)
1562                         continue;
1563 
1564                 af = nla_nest_start_noflag(skb, af_ops->family);
1565                 if (!af)
1566                         return -EMSGSIZE;
1567 
1568                 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1569                 /*
1570                  * Caller may return ENODATA to indicate that there
1571                  * was no data to be dumped. This is not an error, it
1572                  * means we should trim the attribute header and
1573                  * continue.
1574                  */
1575                 if (err == -ENODATA)
1576                         nla_nest_cancel(skb, af);
1577                 else if (err < 0)
1578                         return -EMSGSIZE;
1579 
1580                 nla_nest_end(skb, af);
1581         }
1582 
1583         nla_nest_end(skb, af_spec);
1584         return 0;
1585 }
1586 
1587 static int rtnl_fill_ifinfo(struct sk_buff *skb,
1588                             struct net_device *dev, struct net *src_net,
1589                             int type, u32 pid, u32 seq, u32 change,
1590                             unsigned int flags, u32 ext_filter_mask,
1591                             u32 event, int *new_nsid, int new_ifindex,
1592                             int tgt_netnsid, gfp_t gfp)
1593 {
1594         struct ifinfomsg *ifm;
1595         struct nlmsghdr *nlh;
1596 
1597         ASSERT_RTNL();
1598         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1599         if (nlh == NULL)
1600                 return -EMSGSIZE;
1601 
1602         ifm = nlmsg_data(nlh);
1603         ifm->ifi_family = AF_UNSPEC;
1604         ifm->__ifi_pad = 0;
1605         ifm->ifi_type = dev->type;
1606         ifm->ifi_index = dev->ifindex;
1607         ifm->ifi_flags = dev_get_flags(dev);
1608         ifm->ifi_change = change;
1609 
1610         if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
1611                 goto nla_put_failure;
1612 
1613         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1614             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1615             nla_put_u8(skb, IFLA_OPERSTATE,
1616                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1617             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1618             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1619             nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
1620             nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
1621             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1622             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1623             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1624             nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1625             nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1626 #ifdef CONFIG_RPS
1627             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1628 #endif
1629             put_master_ifindex(skb, dev) ||
1630             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1631             (dev->qdisc &&
1632              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1633             nla_put_ifalias(skb, dev) ||
1634             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1635                         atomic_read(&dev->carrier_up_count) +
1636                         atomic_read(&dev->carrier_down_count)) ||
1637             nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down) ||
1638             nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
1639                         atomic_read(&dev->carrier_up_count)) ||
1640             nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
1641                         atomic_read(&dev->carrier_down_count)))
1642                 goto nla_put_failure;
1643 
1644         if (event != IFLA_EVENT_NONE) {
1645                 if (nla_put_u32(skb, IFLA_EVENT, event))
1646                         goto nla_put_failure;
1647         }
1648 
1649         if (rtnl_fill_link_ifmap(skb, dev))
1650                 goto nla_put_failure;
1651 
1652         if (dev->addr_len) {
1653                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1654                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1655                         goto nla_put_failure;
1656         }
1657 
1658         if (rtnl_phys_port_id_fill(skb, dev))
1659                 goto nla_put_failure;
1660 
1661         if (rtnl_phys_port_name_fill(skb, dev))
1662                 goto nla_put_failure;
1663 
1664         if (rtnl_phys_switch_id_fill(skb, dev))
1665                 goto nla_put_failure;
1666 
1667         if (rtnl_fill_stats(skb, dev))
1668                 goto nla_put_failure;
1669 
1670         if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1671                 goto nla_put_failure;
1672 
1673         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1674                 goto nla_put_failure;
1675 
1676         if (rtnl_xdp_fill(skb, dev))
1677                 goto nla_put_failure;
1678 
1679         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1680                 if (rtnl_link_fill(skb, dev) < 0)
1681                         goto nla_put_failure;
1682         }
1683 
1684         if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp))
1685                 goto nla_put_failure;
1686 
1687         if (new_nsid &&
1688             nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1689                 goto nla_put_failure;
1690         if (new_ifindex &&
1691             nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
1692                 goto nla_put_failure;
1693 
1694 
1695         rcu_read_lock();
1696         if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1697                 goto nla_put_failure_rcu;
1698         rcu_read_unlock();
1699 
1700         nlmsg_end(skb, nlh);
1701         return 0;
1702 
1703 nla_put_failure_rcu:
1704         rcu_read_unlock();
1705 nla_put_failure:
1706         nlmsg_cancel(skb, nlh);
1707         return -EMSGSIZE;
1708 }
1709 
1710 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1711         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1712         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1713         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1714         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1715         [IFLA_MTU]              = { .type = NLA_U32 },
1716         [IFLA_LINK]             = { .type = NLA_U32 },
1717         [IFLA_MASTER]           = { .type = NLA_U32 },
1718         [IFLA_CARRIER]          = { .type = NLA_U8 },
1719         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1720         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1721         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1722         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1723         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1724         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1725         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1726         /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1727          * allow 0-length string (needed to remove an alias).
1728          */
1729         [IFLA_IFALIAS]          = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1730         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1731         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1732         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1733         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1734         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1735         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1736         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1737         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1738         [IFLA_GSO_MAX_SEGS]     = { .type = NLA_U32 },
1739         [IFLA_GSO_MAX_SIZE]     = { .type = NLA_U32 },
1740         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1741         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1742         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1743         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1744         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1745         [IFLA_XDP]              = { .type = NLA_NESTED },
1746         [IFLA_EVENT]            = { .type = NLA_U32 },
1747         [IFLA_GROUP]            = { .type = NLA_U32 },
1748         [IFLA_TARGET_NETNSID]   = { .type = NLA_S32 },
1749         [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 },
1750         [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
1751         [IFLA_MIN_MTU]          = { .type = NLA_U32 },
1752         [IFLA_MAX_MTU]          = { .type = NLA_U32 },
1753 };
1754 
1755 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1756         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1757         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1758         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1759         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1760 };
1761 
1762 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1763         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1764         [IFLA_VF_BROADCAST]     = { .type = NLA_REJECT },
1765         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1766         [IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1767         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1768         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1769         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1770         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1771         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1772         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1773         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1774         [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1775         [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1776 };
1777 
1778 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1779         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1780         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1781                                     .len = PORT_PROFILE_MAX },
1782         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1783                                       .len = PORT_UUID_MAX },
1784         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1785                                     .len = PORT_UUID_MAX },
1786         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1787         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1788 
1789         /* Unused, but we need to keep it here since user space could
1790          * fill it. It's also broken with regard to NLA_BINARY use in
1791          * combination with structs.
1792          */
1793         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1794                                     .len = sizeof(struct ifla_port_vsi) },
1795 };
1796 
1797 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1798         [IFLA_XDP_FD]           = { .type = NLA_S32 },
1799         [IFLA_XDP_ATTACHED]     = { .type = NLA_U8 },
1800         [IFLA_XDP_FLAGS]        = { .type = NLA_U32 },
1801         [IFLA_XDP_PROG_ID]      = { .type = NLA_U32 },
1802 };
1803 
1804 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1805 {
1806         const struct rtnl_link_ops *ops = NULL;
1807         struct nlattr *linfo[IFLA_INFO_MAX + 1];
1808 
1809         if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0)
1810                 return NULL;
1811 
1812         if (linfo[IFLA_INFO_KIND]) {
1813                 char kind[MODULE_NAME_LEN];
1814 
1815                 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1816                 ops = rtnl_link_ops_get(kind);
1817         }
1818 
1819         return ops;
1820 }
1821 
1822 static bool link_master_filtered(struct net_device *dev, int master_idx)
1823 {
1824         struct net_device *master;
1825 
1826         if (!master_idx)
1827                 return false;
1828 
1829         master = netdev_master_upper_dev_get(dev);
1830         if (!master || master->ifindex != master_idx)
1831                 return true;
1832 
1833         return false;
1834 }
1835 
1836 static bool link_kind_filtered(const struct net_device *dev,
1837                                const struct rtnl_link_ops *kind_ops)
1838 {
1839         if (kind_ops && dev->rtnl_link_ops != kind_ops)
1840                 return true;
1841 
1842         return false;
1843 }
1844 
1845 static bool link_dump_filtered(struct net_device *dev,
1846                                int master_idx,
1847                                const struct rtnl_link_ops *kind_ops)
1848 {
1849         if (link_master_filtered(dev, master_idx) ||
1850             link_kind_filtered(dev, kind_ops))
1851                 return true;
1852 
1853         return false;
1854 }
1855 
1856 /**
1857  * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.
1858  * @sk: netlink socket
1859  * @netnsid: network namespace identifier
1860  *
1861  * Returns the network namespace identified by netnsid on success or an error
1862  * pointer on failure.
1863  */
1864 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)
1865 {
1866         struct net *net;
1867 
1868         net = get_net_ns_by_id(sock_net(sk), netnsid);
1869         if (!net)
1870                 return ERR_PTR(-EINVAL);
1871 
1872         /* For now, the caller is required to have CAP_NET_ADMIN in
1873          * the user namespace owning the target net ns.
1874          */
1875         if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
1876                 put_net(net);
1877                 return ERR_PTR(-EACCES);
1878         }
1879         return net;
1880 }
1881 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);
1882 
1883 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh,
1884                                       bool strict_check, struct nlattr **tb,
1885                                       struct netlink_ext_ack *extack)
1886 {
1887         int hdrlen;
1888 
1889         if (strict_check) {
1890                 struct ifinfomsg *ifm;
1891 
1892                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
1893                         NL_SET_ERR_MSG(extack, "Invalid header for link dump");
1894                         return -EINVAL;
1895                 }
1896 
1897                 ifm = nlmsg_data(nlh);
1898                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
1899                     ifm->ifi_change) {
1900                         NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request");
1901                         return -EINVAL;
1902                 }
1903                 if (ifm->ifi_index) {
1904                         NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps");
1905                         return -EINVAL;
1906                 }
1907 
1908                 return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb,
1909                                                      IFLA_MAX, ifla_policy,
1910                                                      extack);
1911         }
1912 
1913         /* A hack to preserve kernel<->userspace interface.
1914          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1915          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1916          * what iproute2 < v3.9.0 used.
1917          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1918          * attribute, its netlink message is shorter than struct ifinfomsg.
1919          */
1920         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
1921                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1922 
1923         return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy,
1924                                       extack);
1925 }
1926 
1927 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1928 {
1929         struct netlink_ext_ack *extack = cb->extack;
1930         const struct nlmsghdr *nlh = cb->nlh;
1931         struct net *net = sock_net(skb->sk);
1932         struct net *tgt_net = net;
1933         int h, s_h;
1934         int idx = 0, s_idx;
1935         struct net_device *dev;
1936         struct hlist_head *head;
1937         struct nlattr *tb[IFLA_MAX+1];
1938         u32 ext_filter_mask = 0;
1939         const struct rtnl_link_ops *kind_ops = NULL;
1940         unsigned int flags = NLM_F_MULTI;
1941         int master_idx = 0;
1942         int netnsid = -1;
1943         int err, i;
1944 
1945         s_h = cb->args[0];
1946         s_idx = cb->args[1];
1947 
1948         err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack);
1949         if (err < 0) {
1950                 if (cb->strict_check)
1951                         return err;
1952 
1953                 goto walk_entries;
1954         }
1955 
1956         for (i = 0; i <= IFLA_MAX; ++i) {
1957                 if (!tb[i])
1958                         continue;
1959 
1960                 /* new attributes should only be added with strict checking */
1961                 switch (i) {
1962                 case IFLA_TARGET_NETNSID:
1963                         netnsid = nla_get_s32(tb[i]);
1964                         tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid);
1965                         if (IS_ERR(tgt_net)) {
1966                                 NL_SET_ERR_MSG(extack, "Invalid target network namespace id");
1967                                 return PTR_ERR(tgt_net);
1968                         }
1969                         break;
1970                 case IFLA_EXT_MASK:
1971                         ext_filter_mask = nla_get_u32(tb[i]);
1972                         break;
1973                 case IFLA_MASTER:
1974                         master_idx = nla_get_u32(tb[i]);
1975                         break;
1976                 case IFLA_LINKINFO:
1977                         kind_ops = linkinfo_to_kind_ops(tb[i]);
1978                         break;
1979                 default:
1980                         if (cb->strict_check) {
1981                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request");
1982                                 return -EINVAL;
1983                         }
1984                 }
1985         }
1986 
1987         if (master_idx || kind_ops)
1988                 flags |= NLM_F_DUMP_FILTERED;
1989 
1990 walk_entries:
1991         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1992                 idx = 0;
1993                 head = &tgt_net->dev_index_head[h];
1994                 hlist_for_each_entry(dev, head, index_hlist) {
1995                         if (link_dump_filtered(dev, master_idx, kind_ops))
1996                                 goto cont;
1997                         if (idx < s_idx)
1998                                 goto cont;
1999                         err = rtnl_fill_ifinfo(skb, dev, net,
2000                                                RTM_NEWLINK,
2001                                                NETLINK_CB(cb->skb).portid,
2002                                                nlh->nlmsg_seq, 0, flags,
2003                                                ext_filter_mask, 0, NULL, 0,
2004                                                netnsid, GFP_KERNEL);
2005 
2006                         if (err < 0) {
2007                                 if (likely(skb->len))
2008                                         goto out;
2009 
2010                                 goto out_err;
2011                         }
2012 cont:
2013                         idx++;
2014                 }
2015         }
2016 out:
2017         err = skb->len;
2018 out_err:
2019         cb->args[1] = idx;
2020         cb->args[0] = h;
2021         cb->seq = net->dev_base_seq;
2022         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2023         if (netnsid >= 0)
2024                 put_net(tgt_net);
2025 
2026         return err;
2027 }
2028 
2029 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
2030                         struct netlink_ext_ack *exterr)
2031 {
2032         return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy,
2033                                     exterr);
2034 }
2035 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
2036 
2037 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
2038 {
2039         struct net *net;
2040         /* Examine the link attributes and figure out which
2041          * network namespace we are talking about.
2042          */
2043         if (tb[IFLA_NET_NS_PID])
2044                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
2045         else if (tb[IFLA_NET_NS_FD])
2046                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
2047         else
2048                 net = get_net(src_net);
2049         return net;
2050 }
2051 EXPORT_SYMBOL(rtnl_link_get_net);
2052 
2053 /* Figure out which network namespace we are talking about by
2054  * examining the link attributes in the following order:
2055  *
2056  * 1. IFLA_NET_NS_PID
2057  * 2. IFLA_NET_NS_FD
2058  * 3. IFLA_TARGET_NETNSID
2059  */
2060 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
2061                                                struct nlattr *tb[])
2062 {
2063         struct net *net;
2064 
2065         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
2066                 return rtnl_link_get_net(src_net, tb);
2067 
2068         if (!tb[IFLA_TARGET_NETNSID])
2069                 return get_net(src_net);
2070 
2071         net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID]));
2072         if (!net)
2073                 return ERR_PTR(-EINVAL);
2074 
2075         return net;
2076 }
2077 
2078 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
2079                                              struct net *src_net,
2080                                              struct nlattr *tb[], int cap)
2081 {
2082         struct net *net;
2083 
2084         net = rtnl_link_get_net_by_nlattr(src_net, tb);
2085         if (IS_ERR(net))
2086                 return net;
2087 
2088         if (!netlink_ns_capable(skb, net->user_ns, cap)) {
2089                 put_net(net);
2090                 return ERR_PTR(-EPERM);
2091         }
2092 
2093         return net;
2094 }
2095 
2096 /* Verify that rtnetlink requests do not pass additional properties
2097  * potentially referring to different network namespaces.
2098  */
2099 static int rtnl_ensure_unique_netns(struct nlattr *tb[],
2100                                     struct netlink_ext_ack *extack,
2101                                     bool netns_id_only)
2102 {
2103 
2104         if (netns_id_only) {
2105                 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
2106                         return 0;
2107 
2108                 NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
2109                 return -EOPNOTSUPP;
2110         }
2111 
2112         if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
2113                 goto invalid_attr;
2114 
2115         if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD]))
2116                 goto invalid_attr;
2117 
2118         if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID]))
2119                 goto invalid_attr;
2120 
2121         return 0;
2122 
2123 invalid_attr:
2124         NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
2125         return -EINVAL;
2126 }
2127 
2128 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
2129 {
2130         if (dev) {
2131                 if (tb[IFLA_ADDRESS] &&
2132                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
2133                         return -EINVAL;
2134 
2135                 if (tb[IFLA_BROADCAST] &&
2136                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
2137                         return -EINVAL;
2138         }
2139 
2140         if (tb[IFLA_AF_SPEC]) {
2141                 struct nlattr *af;
2142                 int rem, err;
2143 
2144                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2145                         const struct rtnl_af_ops *af_ops;
2146 
2147                         rcu_read_lock();
2148                         af_ops = rtnl_af_lookup(nla_type(af));
2149                         if (!af_ops) {
2150                                 rcu_read_unlock();
2151                                 return -EAFNOSUPPORT;
2152                         }
2153 
2154                         if (!af_ops->set_link_af) {
2155                                 rcu_read_unlock();
2156                                 return -EOPNOTSUPP;
2157                         }
2158 
2159                         if (af_ops->validate_link_af) {
2160                                 err = af_ops->validate_link_af(dev, af);
2161                                 if (err < 0) {
2162                                         rcu_read_unlock();
2163                                         return err;
2164                                 }
2165                         }
2166 
2167                         rcu_read_unlock();
2168                 }
2169         }
2170 
2171         return 0;
2172 }
2173 
2174 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
2175                                   int guid_type)
2176 {
2177         const struct net_device_ops *ops = dev->netdev_ops;
2178 
2179         return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
2180 }
2181 
2182 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
2183 {
2184         if (dev->type != ARPHRD_INFINIBAND)
2185                 return -EOPNOTSUPP;
2186 
2187         return handle_infiniband_guid(dev, ivt, guid_type);
2188 }
2189 
2190 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
2191 {
2192         const struct net_device_ops *ops = dev->netdev_ops;
2193         int err = -EINVAL;
2194 
2195         if (tb[IFLA_VF_MAC]) {
2196                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
2197 
2198                 if (ivm->vf >= INT_MAX)
2199                         return -EINVAL;
2200                 err = -EOPNOTSUPP;
2201                 if (ops->ndo_set_vf_mac)
2202                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
2203                                                   ivm->mac);
2204                 if (err < 0)
2205                         return err;
2206         }
2207 
2208         if (tb[IFLA_VF_VLAN]) {
2209                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
2210 
2211                 if (ivv->vf >= INT_MAX)
2212                         return -EINVAL;
2213                 err = -EOPNOTSUPP;
2214                 if (ops->ndo_set_vf_vlan)
2215                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
2216                                                    ivv->qos,
2217                                                    htons(ETH_P_8021Q));
2218                 if (err < 0)
2219                         return err;
2220         }
2221 
2222         if (tb[IFLA_VF_VLAN_LIST]) {
2223                 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
2224                 struct nlattr *attr;
2225                 int rem, len = 0;
2226 
2227                 err = -EOPNOTSUPP;
2228                 if (!ops->ndo_set_vf_vlan)
2229                         return err;
2230 
2231                 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
2232                         if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
2233                             nla_len(attr) < NLA_HDRLEN) {
2234                                 return -EINVAL;
2235                         }
2236                         if (len >= MAX_VLAN_LIST_LEN)
2237                                 return -EOPNOTSUPP;
2238                         ivvl[len] = nla_data(attr);
2239 
2240                         len++;
2241                 }
2242                 if (len == 0)
2243                         return -EINVAL;
2244 
2245                 if (ivvl[0]->vf >= INT_MAX)
2246                         return -EINVAL;
2247                 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
2248                                            ivvl[0]->qos, ivvl[0]->vlan_proto);
2249                 if (err < 0)
2250                         return err;
2251         }
2252 
2253         if (tb[IFLA_VF_TX_RATE]) {
2254                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
2255                 struct ifla_vf_info ivf;
2256 
2257                 if (ivt->vf >= INT_MAX)
2258                         return -EINVAL;
2259                 err = -EOPNOTSUPP;
2260                 if (ops->ndo_get_vf_config)
2261                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
2262                 if (err < 0)
2263                         return err;
2264 
2265                 err = -EOPNOTSUPP;
2266                 if (ops->ndo_set_vf_rate)
2267                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
2268                                                    ivf.min_tx_rate,
2269                                                    ivt->rate);
2270                 if (err < 0)
2271                         return err;
2272         }
2273 
2274         if (tb[IFLA_VF_RATE]) {
2275                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
2276 
2277                 if (ivt->vf >= INT_MAX)
2278                         return -EINVAL;
2279                 err = -EOPNOTSUPP;
2280                 if (ops->ndo_set_vf_rate)
2281                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
2282                                                    ivt->min_tx_rate,
2283                                                    ivt->max_tx_rate);
2284                 if (err < 0)
2285                         return err;
2286         }
2287 
2288         if (tb[IFLA_VF_SPOOFCHK]) {
2289                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
2290 
2291                 if (ivs->vf >= INT_MAX)
2292                         return -EINVAL;
2293                 err = -EOPNOTSUPP;
2294                 if (ops->ndo_set_vf_spoofchk)
2295                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
2296                                                        ivs->setting);
2297                 if (err < 0)
2298                         return err;
2299         }
2300 
2301         if (tb[IFLA_VF_LINK_STATE]) {
2302                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
2303 
2304                 if (ivl->vf >= INT_MAX)
2305                         return -EINVAL;
2306                 err = -EOPNOTSUPP;
2307                 if (ops->ndo_set_vf_link_state)
2308                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
2309                                                          ivl->link_state);
2310                 if (err < 0)
2311                         return err;
2312         }
2313 
2314         if (tb[IFLA_VF_RSS_QUERY_EN]) {
2315                 struct ifla_vf_rss_query_en *ivrssq_en;
2316 
2317                 err = -EOPNOTSUPP;
2318                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
2319                 if (ivrssq_en->vf >= INT_MAX)
2320                         return -EINVAL;
2321                 if (ops->ndo_set_vf_rss_query_en)
2322                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
2323                                                            ivrssq_en->setting);
2324                 if (err < 0)
2325                         return err;
2326         }
2327 
2328         if (tb[IFLA_VF_TRUST]) {
2329                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2330 
2331                 if (ivt->vf >= INT_MAX)
2332                         return -EINVAL;
2333                 err = -EOPNOTSUPP;
2334                 if (ops->ndo_set_vf_trust)
2335                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2336                 if (err < 0)
2337                         return err;
2338         }
2339 
2340         if (tb[IFLA_VF_IB_NODE_GUID]) {
2341                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2342 
2343                 if (ivt->vf >= INT_MAX)
2344                         return -EINVAL;
2345                 if (!ops->ndo_set_vf_guid)
2346                         return -EOPNOTSUPP;
2347                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2348         }
2349 
2350         if (tb[IFLA_VF_IB_PORT_GUID]) {
2351                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2352 
2353                 if (ivt->vf >= INT_MAX)
2354                         return -EINVAL;
2355                 if (!ops->ndo_set_vf_guid)
2356                         return -EOPNOTSUPP;
2357 
2358                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2359         }
2360 
2361         return err;
2362 }
2363 
2364 static int do_set_master(struct net_device *dev, int ifindex,
2365                          struct netlink_ext_ack *extack)
2366 {
2367         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2368         const struct net_device_ops *ops;
2369         int err;
2370 
2371         if (upper_dev) {
2372                 if (upper_dev->ifindex == ifindex)
2373                         return 0;
2374                 ops = upper_dev->netdev_ops;
2375                 if (ops->ndo_del_slave) {
2376                         err = ops->ndo_del_slave(upper_dev, dev);
2377                         if (err)
2378                                 return err;
2379                         netdev_update_lockdep_key(dev);
2380                 } else {
2381                         return -EOPNOTSUPP;
2382                 }
2383         }
2384 
2385         if (ifindex) {
2386                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2387                 if (!upper_dev)
2388                         return -EINVAL;
2389                 ops = upper_dev->netdev_ops;
2390                 if (ops->ndo_add_slave) {
2391                         err = ops->ndo_add_slave(upper_dev, dev, extack);
2392                         if (err)
2393                                 return err;
2394                 } else {
2395                         return -EOPNOTSUPP;
2396                 }
2397         }
2398         return 0;
2399 }
2400 
2401 #define DO_SETLINK_MODIFIED     0x01
2402 /* notify flag means notify + modified. */
2403 #define DO_SETLINK_NOTIFY       0x03
2404 static int do_setlink(const struct sk_buff *skb,
2405                       struct net_device *dev, struct ifinfomsg *ifm,
2406                       struct netlink_ext_ack *extack,
2407                       struct nlattr **tb, char *ifname, int status)
2408 {
2409         const struct net_device_ops *ops = dev->netdev_ops;
2410         int err;
2411 
2412         err = validate_linkmsg(dev, tb);
2413         if (err < 0)
2414                 return err;
2415 
2416         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) {
2417                 struct net *net = rtnl_link_get_net_capable(skb, dev_net(dev),
2418                                                             tb, CAP_NET_ADMIN);
2419                 if (IS_ERR(net)) {
2420                         err = PTR_ERR(net);
2421                         goto errout;
2422                 }
2423 
2424                 err = dev_change_net_namespace(dev, net, ifname);
2425                 put_net(net);
2426                 if (err)
2427                         goto errout;
2428                 status |= DO_SETLINK_MODIFIED;
2429         }
2430 
2431         if (tb[IFLA_MAP]) {
2432                 struct rtnl_link_ifmap *u_map;
2433                 struct ifmap k_map;
2434 
2435                 if (!ops->ndo_set_config) {
2436                         err = -EOPNOTSUPP;
2437                         goto errout;
2438                 }
2439 
2440                 if (!netif_device_present(dev)) {
2441                         err = -ENODEV;
2442                         goto errout;
2443                 }
2444 
2445                 u_map = nla_data(tb[IFLA_MAP]);
2446                 k_map.mem_start = (unsigned long) u_map->mem_start;
2447                 k_map.mem_end = (unsigned long) u_map->mem_end;
2448                 k_map.base_addr = (unsigned short) u_map->base_addr;
2449                 k_map.irq = (unsigned char) u_map->irq;
2450                 k_map.dma = (unsigned char) u_map->dma;
2451                 k_map.port = (unsigned char) u_map->port;
2452 
2453                 err = ops->ndo_set_config(dev, &k_map);
2454                 if (err < 0)
2455                         goto errout;
2456 
2457                 status |= DO_SETLINK_NOTIFY;
2458         }
2459 
2460         if (tb[IFLA_ADDRESS]) {
2461                 struct sockaddr *sa;
2462                 int len;
2463 
2464                 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2465                                                   sizeof(*sa));
2466                 sa = kmalloc(len, GFP_KERNEL);
2467                 if (!sa) {
2468                         err = -ENOMEM;
2469                         goto errout;
2470                 }
2471                 sa->sa_family = dev->type;
2472                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2473                        dev->addr_len);
2474                 err = dev_set_mac_address(dev, sa, extack);
2475                 kfree(sa);
2476                 if (err)
2477                         goto errout;
2478                 status |= DO_SETLINK_MODIFIED;
2479         }
2480 
2481         if (tb[IFLA_MTU]) {
2482                 err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack);
2483                 if (err < 0)
2484                         goto errout;
2485                 status |= DO_SETLINK_MODIFIED;
2486         }
2487 
2488         if (tb[IFLA_GROUP]) {
2489                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2490                 status |= DO_SETLINK_NOTIFY;
2491         }
2492 
2493         /*
2494          * Interface selected by interface index but interface
2495          * name provided implies that a name change has been
2496          * requested.
2497          */
2498         if (ifm->ifi_index > 0 && ifname[0]) {
2499                 err = dev_change_name(dev, ifname);
2500                 if (err < 0)
2501                         goto errout;
2502                 status |= DO_SETLINK_MODIFIED;
2503         }
2504 
2505         if (tb[IFLA_IFALIAS]) {
2506                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2507                                     nla_len(tb[IFLA_IFALIAS]));
2508                 if (err < 0)
2509                         goto errout;
2510                 status |= DO_SETLINK_NOTIFY;
2511         }
2512 
2513         if (tb[IFLA_BROADCAST]) {
2514                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2515                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2516         }
2517 
2518         if (ifm->ifi_flags || ifm->ifi_change) {
2519                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2520                                        extack);
2521                 if (err < 0)
2522                         goto errout;
2523         }
2524 
2525         if (tb[IFLA_MASTER]) {
2526                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2527                 if (err)
2528                         goto errout;
2529                 status |= DO_SETLINK_MODIFIED;
2530         }
2531 
2532         if (tb[IFLA_CARRIER]) {
2533                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2534                 if (err)
2535                         goto errout;
2536                 status |= DO_SETLINK_MODIFIED;
2537         }
2538 
2539         if (tb[IFLA_TXQLEN]) {
2540                 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2541 
2542                 err = dev_change_tx_queue_len(dev, value);
2543                 if (err)
2544                         goto errout;
2545                 status |= DO_SETLINK_MODIFIED;
2546         }
2547 
2548         if (tb[IFLA_GSO_MAX_SIZE]) {
2549                 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
2550 
2551                 if (max_size > GSO_MAX_SIZE) {
2552                         err = -EINVAL;
2553                         goto errout;
2554                 }
2555 
2556                 if (dev->gso_max_size ^ max_size) {
2557                         netif_set_gso_max_size(dev, max_size);
2558                         status |= DO_SETLINK_MODIFIED;
2559                 }
2560         }
2561 
2562         if (tb[IFLA_GSO_MAX_SEGS]) {
2563                 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2564 
2565                 if (max_segs > GSO_MAX_SEGS) {
2566                         err = -EINVAL;
2567                         goto errout;
2568                 }
2569 
2570                 if (dev->gso_max_segs ^ max_segs) {
2571                         dev->gso_max_segs = max_segs;
2572                         status |= DO_SETLINK_MODIFIED;
2573                 }
2574         }
2575 
2576         if (tb[IFLA_OPERSTATE])
2577                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2578 
2579         if (tb[IFLA_LINKMODE]) {
2580                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2581 
2582                 write_lock_bh(&dev_base_lock);
2583                 if (dev->link_mode ^ value)
2584                         status |= DO_SETLINK_NOTIFY;
2585                 dev->link_mode = value;
2586                 write_unlock_bh(&dev_base_lock);
2587         }
2588 
2589         if (tb[IFLA_VFINFO_LIST]) {
2590                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2591                 struct nlattr *attr;
2592                 int rem;
2593 
2594                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2595                         if (nla_type(attr) != IFLA_VF_INFO ||
2596                             nla_len(attr) < NLA_HDRLEN) {
2597                                 err = -EINVAL;
2598                                 goto errout;
2599                         }
2600                         err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX,
2601                                                           attr,
2602                                                           ifla_vf_policy,
2603                                                           NULL);
2604                         if (err < 0)
2605                                 goto errout;
2606                         err = do_setvfinfo(dev, vfinfo);
2607                         if (err < 0)
2608                                 goto errout;
2609                         status |= DO_SETLINK_NOTIFY;
2610                 }
2611         }
2612         err = 0;
2613 
2614         if (tb[IFLA_VF_PORTS]) {
2615                 struct nlattr *port[IFLA_PORT_MAX+1];
2616                 struct nlattr *attr;
2617                 int vf;
2618                 int rem;
2619 
2620                 err = -EOPNOTSUPP;
2621                 if (!ops->ndo_set_vf_port)
2622                         goto errout;
2623 
2624                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2625                         if (nla_type(attr) != IFLA_VF_PORT ||
2626                             nla_len(attr) < NLA_HDRLEN) {
2627                                 err = -EINVAL;
2628                                 goto errout;
2629                         }
2630                         err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2631                                                           attr,
2632                                                           ifla_port_policy,
2633                                                           NULL);
2634                         if (err < 0)
2635                                 goto errout;
2636                         if (!port[IFLA_PORT_VF]) {
2637                                 err = -EOPNOTSUPP;
2638                                 goto errout;
2639                         }
2640                         vf = nla_get_u32(port[IFLA_PORT_VF]);
2641                         err = ops->ndo_set_vf_port(dev, vf, port);
2642                         if (err < 0)
2643                                 goto errout;
2644                         status |= DO_SETLINK_NOTIFY;
2645                 }
2646         }
2647         err = 0;
2648 
2649         if (tb[IFLA_PORT_SELF]) {
2650                 struct nlattr *port[IFLA_PORT_MAX+1];
2651 
2652                 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2653                                                   tb[IFLA_PORT_SELF],
2654                                                   ifla_port_policy, NULL);
2655                 if (err < 0)
2656                         goto errout;
2657 
2658                 err = -EOPNOTSUPP;
2659                 if (ops->ndo_set_vf_port)
2660                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2661                 if (err < 0)
2662                         goto errout;
2663                 status |= DO_SETLINK_NOTIFY;
2664         }
2665 
2666         if (tb[IFLA_AF_SPEC]) {
2667                 struct nlattr *af;
2668                 int rem;
2669 
2670                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2671                         const struct rtnl_af_ops *af_ops;
2672 
2673                         rcu_read_lock();
2674 
2675                         BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
2676 
2677                         err = af_ops->set_link_af(dev, af);
2678                         if (err < 0) {
2679                                 rcu_read_unlock();
2680                                 goto errout;
2681                         }
2682 
2683                         rcu_read_unlock();
2684                         status |= DO_SETLINK_NOTIFY;
2685                 }
2686         }
2687         err = 0;
2688 
2689         if (tb[IFLA_PROTO_DOWN]) {
2690                 err = dev_change_proto_down(dev,
2691                                             nla_get_u8(tb[IFLA_PROTO_DOWN]));
2692                 if (err)
2693                         goto errout;
2694                 status |= DO_SETLINK_NOTIFY;
2695         }
2696 
2697         if (tb[IFLA_XDP]) {
2698                 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2699                 u32 xdp_flags = 0;
2700 
2701                 err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX,
2702                                                   tb[IFLA_XDP],
2703                                                   ifla_xdp_policy, NULL);
2704                 if (err < 0)
2705                         goto errout;
2706 
2707                 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2708                         err = -EINVAL;
2709                         goto errout;
2710                 }
2711 
2712                 if (xdp[IFLA_XDP_FLAGS]) {
2713                         xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2714                         if (xdp_flags & ~XDP_FLAGS_MASK) {
2715                                 err = -EINVAL;
2716                                 goto errout;
2717                         }
2718                         if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2719                                 err = -EINVAL;
2720                                 goto errout;
2721                         }
2722                 }
2723 
2724                 if (xdp[IFLA_XDP_FD]) {
2725                         err = dev_change_xdp_fd(dev, extack,
2726                                                 nla_get_s32(xdp[IFLA_XDP_FD]),
2727                                                 xdp_flags);
2728                         if (err)
2729                                 goto errout;
2730                         status |= DO_SETLINK_NOTIFY;
2731                 }
2732         }
2733 
2734 errout:
2735         if (status & DO_SETLINK_MODIFIED) {
2736                 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2737                         netdev_state_change(dev);
2738 
2739                 if (err < 0)
2740                         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",
2741                                              dev->name);
2742         }
2743 
2744         return err;
2745 }
2746 
2747 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2748                         struct netlink_ext_ack *extack)
2749 {
2750         struct net *net = sock_net(skb->sk);
2751         struct ifinfomsg *ifm;
2752         struct net_device *dev;
2753         int err;
2754         struct nlattr *tb[IFLA_MAX+1];
2755         char ifname[IFNAMSIZ];
2756 
2757         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
2758                                      ifla_policy, extack);
2759         if (err < 0)
2760                 goto errout;
2761 
2762         err = rtnl_ensure_unique_netns(tb, extack, false);
2763         if (err < 0)
2764                 goto errout;
2765 
2766         if (tb[IFLA_IFNAME])
2767                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2768         else
2769                 ifname[0] = '\0';
2770 
2771         err = -EINVAL;
2772         ifm = nlmsg_data(nlh);
2773         if (ifm->ifi_index > 0)
2774                 dev = __dev_get_by_index(net, ifm->ifi_index);
2775         else if (tb[IFLA_IFNAME])
2776                 dev = __dev_get_by_name(net, ifname);
2777         else
2778                 goto errout;
2779 
2780         if (dev == NULL) {
2781                 err = -ENODEV;
2782                 goto errout;
2783         }
2784 
2785         err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
2786 errout:
2787         return err;
2788 }
2789 
2790 static int rtnl_group_dellink(const struct net *net, int group)
2791 {
2792         struct net_device *dev, *aux;
2793         LIST_HEAD(list_kill);
2794         bool found = false;
2795 
2796         if (!group)
2797                 return -EPERM;
2798 
2799         for_each_netdev(net, dev) {
2800                 if (dev->group == group) {
2801                         const struct rtnl_link_ops *ops;
2802 
2803                         found = true;
2804                         ops = dev->rtnl_link_ops;
2805                         if (!ops || !ops->dellink)
2806                                 return -EOPNOTSUPP;
2807                 }
2808         }
2809 
2810         if (!found)
2811                 return -ENODEV;
2812 
2813         for_each_netdev_safe(net, dev, aux) {
2814                 if (dev->group == group) {
2815                         const struct rtnl_link_ops *ops;
2816 
2817                         ops = dev->rtnl_link_ops;
2818                         ops->dellink(dev, &list_kill);
2819                 }
2820         }
2821         unregister_netdevice_many(&list_kill);
2822 
2823         return 0;
2824 }
2825 
2826 int rtnl_delete_link(struct net_device *dev)
2827 {
2828         const struct rtnl_link_ops *ops;
2829         LIST_HEAD(list_kill);
2830 
2831         ops = dev->rtnl_link_ops;
2832         if (!ops || !ops->dellink)
2833                 return -EOPNOTSUPP;
2834 
2835         ops->dellink(dev, &list_kill);
2836         unregister_netdevice_many(&list_kill);
2837 
2838         return 0;
2839 }
2840 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2841 
2842 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
2843                         struct netlink_ext_ack *extack)
2844 {
2845         struct net *net = sock_net(skb->sk);
2846         struct net *tgt_net = net;
2847         struct net_device *dev = NULL;
2848         struct ifinfomsg *ifm;
2849         char ifname[IFNAMSIZ];
2850         struct nlattr *tb[IFLA_MAX+1];
2851         int err;
2852         int netnsid = -1;
2853 
2854         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
2855                                      ifla_policy, extack);
2856         if (err < 0)
2857                 return err;
2858 
2859         err = rtnl_ensure_unique_netns(tb, extack, true);
2860         if (err < 0)
2861                 return err;
2862 
2863         if (tb[IFLA_IFNAME])
2864                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2865 
2866         if (tb[IFLA_TARGET_NETNSID]) {
2867                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
2868                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
2869                 if (IS_ERR(tgt_net))
2870                         return PTR_ERR(tgt_net);
2871         }
2872 
2873         err = -EINVAL;
2874         ifm = nlmsg_data(nlh);
2875         if (ifm->ifi_index > 0)
2876                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
2877         else if (tb[IFLA_IFNAME])
2878                 dev = __dev_get_by_name(tgt_net, ifname);
2879         else if (tb[IFLA_GROUP])
2880                 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
2881         else
2882                 goto out;
2883 
2884         if (!dev) {
2885                 if (tb[IFLA_IFNAME] || ifm->ifi_index > 0)
2886                         err = -ENODEV;
2887 
2888                 goto out;
2889         }
2890 
2891         err = rtnl_delete_link(dev);
2892 
2893 out:
2894         if (netnsid >= 0)
2895                 put_net(tgt_net);
2896 
2897         return err;
2898 }
2899 
2900 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2901 {
2902         unsigned int old_flags;
2903         int err;
2904 
2905         old_flags = dev->flags;
2906         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2907                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2908                                          NULL);
2909                 if (err < 0)
2910                         return err;
2911         }
2912 
2913         if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
2914                 __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags));
2915         } else {
2916                 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2917                 __dev_notify_flags(dev, old_flags, ~0U);
2918         }
2919         return 0;
2920 }
2921 EXPORT_SYMBOL(rtnl_configure_link);
2922 
2923 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
2924                                     unsigned char name_assign_type,
2925                                     const struct rtnl_link_ops *ops,
2926                                     struct nlattr *tb[],
2927                                     struct netlink_ext_ack *extack)
2928 {
2929         struct net_device *dev;
2930         unsigned int num_tx_queues = 1;
2931         unsigned int num_rx_queues = 1;
2932 
2933         if (tb[IFLA_NUM_TX_QUEUES])
2934                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2935         else if (ops->get_num_tx_queues)
2936                 num_tx_queues = ops->get_num_tx_queues();
2937 
2938         if (tb[IFLA_NUM_RX_QUEUES])
2939                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2940         else if (ops->get_num_rx_queues)
2941                 num_rx_queues = ops->get_num_rx_queues();
2942 
2943         if (num_tx_queues < 1 || num_tx_queues > 4096) {
2944                 NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
2945                 return ERR_PTR(-EINVAL);
2946         }
2947 
2948         if (num_rx_queues < 1 || num_rx_queues > 4096) {
2949                 NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
2950                 return ERR_PTR(-EINVAL);
2951         }
2952 
2953         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2954                                ops->setup, num_tx_queues, num_rx_queues);
2955         if (!dev)
2956                 return ERR_PTR(-ENOMEM);
2957 
2958         dev_net_set(dev, net);
2959         dev->rtnl_link_ops = ops;
2960         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2961 
2962         if (tb[IFLA_MTU]) {
2963                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
2964                 int err;
2965 
2966                 err = dev_validate_mtu(dev, mtu, extack);
2967                 if (err) {
2968                         free_netdev(dev);
2969                         return ERR_PTR(err);
2970                 }
2971                 dev->mtu = mtu;
2972         }
2973         if (tb[IFLA_ADDRESS]) {
2974                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2975                                 nla_len(tb[IFLA_ADDRESS]));
2976                 dev->addr_assign_type = NET_ADDR_SET;
2977         }
2978         if (tb[IFLA_BROADCAST])
2979                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2980                                 nla_len(tb[IFLA_BROADCAST]));
2981         if (tb[IFLA_TXQLEN])
2982                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2983         if (tb[IFLA_OPERSTATE])
2984                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2985         if (tb[IFLA_LINKMODE])
2986                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2987         if (tb[IFLA_GROUP])
2988                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2989         if (tb[IFLA_GSO_MAX_SIZE])
2990                 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
2991         if (tb[IFLA_GSO_MAX_SEGS])
2992                 dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2993 
2994         return dev;
2995 }
2996 EXPORT_SYMBOL(rtnl_create_link);
2997 
2998 static int rtnl_group_changelink(const struct sk_buff *skb,
2999                 struct net *net, int group,
3000                 struct ifinfomsg *ifm,
3001                 struct netlink_ext_ack *extack,
3002                 struct nlattr **tb)
3003 {
3004         struct net_device *dev, *aux;
3005         int err;
3006 
3007         for_each_netdev_safe(net, dev, aux) {
3008                 if (dev->group == group) {
3009                         err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
3010                         if (err < 0)
3011                                 return err;
3012                 }
3013         }
3014 
3015         return 0;
3016 }
3017 
3018 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3019                           struct nlattr **attr, struct netlink_ext_ack *extack)
3020 {
3021         struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
3022         unsigned char name_assign_type = NET_NAME_USER;
3023         struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
3024         const struct rtnl_link_ops *m_ops = NULL;
3025         struct net_device *master_dev = NULL;
3026         struct net *net = sock_net(skb->sk);
3027         const struct rtnl_link_ops *ops;
3028         struct nlattr *tb[IFLA_MAX + 1];
3029         struct net *dest_net, *link_net;
3030         struct nlattr **slave_data;
3031         char kind[MODULE_NAME_LEN];
3032         struct net_device *dev;
3033         struct ifinfomsg *ifm;
3034         char ifname[IFNAMSIZ];
3035         struct nlattr **data;
3036         int err;
3037 
3038 #ifdef CONFIG_MODULES
3039 replay:
3040 #endif
3041         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3042                                      ifla_policy, extack);
3043         if (err < 0)
3044                 return err;
3045 
3046         err = rtnl_ensure_unique_netns(tb, extack, false);
3047         if (err < 0)
3048                 return err;
3049 
3050         if (tb[IFLA_IFNAME])
3051                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3052         else
3053                 ifname[0] = '\0';
3054 
3055         ifm = nlmsg_data(nlh);
3056         if (ifm->ifi_index > 0)
3057                 dev = __dev_get_by_index(net, ifm->ifi_index);
3058         else {
3059                 if (ifname[0])
3060                         dev = __dev_get_by_name(net, ifname);
3061                 else
3062                         dev = NULL;
3063         }
3064 
3065         if (dev) {
3066                 master_dev = netdev_master_upper_dev_get(dev);
3067                 if (master_dev)
3068                         m_ops = master_dev->rtnl_link_ops;
3069         }
3070 
3071         err = validate_linkmsg(dev, tb);
3072         if (err < 0)
3073                 return err;
3074 
3075         if (tb[IFLA_LINKINFO]) {
3076                 err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
3077                                                   tb[IFLA_LINKINFO],
3078                                                   ifla_info_policy, NULL);
3079                 if (err < 0)
3080                         return err;
3081         } else
3082                 memset(linkinfo, 0, sizeof(linkinfo));
3083 
3084         if (linkinfo[IFLA_INFO_KIND]) {
3085                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
3086                 ops = rtnl_link_ops_get(kind);
3087         } else {
3088                 kind[0] = '\0';
3089                 ops = NULL;
3090         }
3091 
3092         data = NULL;
3093         if (ops) {
3094                 if (ops->maxtype > RTNL_MAX_TYPE)
3095                         return -EINVAL;
3096 
3097                 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
3098                         err = nla_parse_nested_deprecated(attr, ops->maxtype,
3099                                                           linkinfo[IFLA_INFO_DATA],
3100                                                           ops->policy, extack);
3101                         if (err < 0)
3102                                 return err;
3103                         data = attr;
3104                 }
3105                 if (ops->validate) {
3106                         err = ops->validate(tb, data, extack);
3107                         if (err < 0)
3108                                 return err;
3109                 }
3110         }
3111 
3112         slave_data = NULL;
3113         if (m_ops) {
3114                 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
3115                         return -EINVAL;
3116 
3117                 if (m_ops->slave_maxtype &&
3118                     linkinfo[IFLA_INFO_SLAVE_DATA]) {
3119                         err = nla_parse_nested_deprecated(slave_attr,
3120                                                           m_ops->slave_maxtype,
3121                                                           linkinfo[IFLA_INFO_SLAVE_DATA],
3122                                                           m_ops->slave_policy,
3123                                                           extack);
3124                         if (err < 0)
3125                                 return err;
3126                         slave_data = slave_attr;
3127                 }
3128         }
3129 
3130         if (dev) {
3131                 int status = 0;
3132 
3133                 if (nlh->nlmsg_flags & NLM_F_EXCL)
3134                         return -EEXIST;
3135                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3136                         return -EOPNOTSUPP;
3137 
3138                 if (linkinfo[IFLA_INFO_DATA]) {
3139                         if (!ops || ops != dev->rtnl_link_ops ||
3140                             !ops->changelink)
3141                                 return -EOPNOTSUPP;
3142 
3143                         err = ops->changelink(dev, tb, data, extack);
3144                         if (err < 0)
3145                                 return err;
3146                         status |= DO_SETLINK_NOTIFY;
3147                 }
3148 
3149                 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
3150                         if (!m_ops || !m_ops->slave_changelink)
3151                                 return -EOPNOTSUPP;
3152 
3153                         err = m_ops->slave_changelink(master_dev, dev, tb,
3154                                                       slave_data, extack);
3155                         if (err < 0)
3156                                 return err;
3157                         status |= DO_SETLINK_NOTIFY;
3158                 }
3159 
3160                 return do_setlink(skb, dev, ifm, extack, tb, ifname, status);
3161         }
3162 
3163         if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
3164                 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
3165                         return rtnl_group_changelink(skb, net,
3166                                                 nla_get_u32(tb[IFLA_GROUP]),
3167                                                 ifm, extack, tb);
3168                 return -ENODEV;
3169         }
3170 
3171         if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
3172                 return -EOPNOTSUPP;
3173 
3174         if (!ops) {
3175 #ifdef CONFIG_MODULES
3176                 if (kind[0]) {
3177                         __rtnl_unlock();
3178                         request_module("rtnl-link-%s", kind);
3179                         rtnl_lock();
3180                         ops = rtnl_link_ops_get(kind);
3181                         if (ops)
3182                                 goto replay;
3183                 }
3184 #endif
3185                 NL_SET_ERR_MSG(extack, "Unknown device type");
3186                 return -EOPNOTSUPP;
3187         }
3188 
3189         if (!ops->setup)
3190                 return -EOPNOTSUPP;
3191 
3192         if (!ifname[0]) {
3193                 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3194                 name_assign_type = NET_NAME_ENUM;
3195         }
3196 
3197         dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3198         if (IS_ERR(dest_net))
3199                 return PTR_ERR(dest_net);
3200 
3201         if (tb[IFLA_LINK_NETNSID]) {
3202                 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3203 
3204                 link_net = get_net_ns_by_id(dest_net, id);
3205                 if (!link_net) {
3206                         NL_SET_ERR_MSG(extack, "Unknown network namespace id");
3207                         err =  -EINVAL;
3208                         goto out;
3209                 }
3210                 err = -EPERM;
3211                 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3212                         goto out;
3213         } else {
3214                 link_net = NULL;
3215         }
3216 
3217         dev = rtnl_create_link(link_net ? : dest_net, ifname,
3218                                name_assign_type, ops, tb, extack);
3219         if (IS_ERR(dev)) {
3220                 err = PTR_ERR(dev);
3221                 goto out;
3222         }
3223 
3224         dev->ifindex = ifm->ifi_index;
3225 
3226         if (ops->newlink) {
3227                 err = ops->newlink(link_net ? : net, dev, tb, data, extack);
3228                 /* Drivers should call free_netdev() in ->destructor
3229                  * and unregister it on failure after registration
3230                  * so that device could be finally freed in rtnl_unlock.
3231                  */
3232                 if (err < 0) {
3233                         /* If device is not registered at all, free it now */
3234                         if (dev->reg_state == NETREG_UNINITIALIZED)
3235                                 free_netdev(dev);
3236                         goto out;
3237                 }
3238         } else {
3239                 err = register_netdevice(dev);
3240                 if (err < 0) {
3241                         free_netdev(dev);
3242                         goto out;
3243                 }
3244         }
3245         err = rtnl_configure_link(dev, ifm);
3246         if (err < 0)
3247                 goto out_unregister;
3248         if (link_net) {
3249                 err = dev_change_net_namespace(dev, dest_net, ifname);
3250                 if (err < 0)
3251                         goto out_unregister;
3252         }
3253         if (tb[IFLA_MASTER]) {
3254                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
3255                 if (err)
3256                         goto out_unregister;
3257         }
3258 out:
3259         if (link_net)
3260                 put_net(link_net);
3261         put_net(dest_net);
3262         return err;
3263 out_unregister:
3264         if (ops->newlink) {
3265                 LIST_HEAD(list_kill);
3266 
3267                 ops->dellink(dev, &list_kill);
3268                 unregister_netdevice_many(&list_kill);
3269         } else {
3270                 unregister_netdevice(dev);
3271         }
3272         goto out;
3273 }
3274 
3275 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3276                         struct netlink_ext_ack *extack)
3277 {
3278         struct nlattr **attr;
3279         int ret;
3280 
3281         attr = kmalloc_array(RTNL_MAX_TYPE + 1, sizeof(*attr), GFP_KERNEL);
3282         if (!attr)
3283                 return -ENOMEM;
3284 
3285         ret = __rtnl_newlink(skb, nlh, attr, extack);
3286         kfree(attr);
3287         return ret;
3288 }
3289 
3290 static int rtnl_valid_getlink_req(struct sk_buff *skb,
3291                                   const struct nlmsghdr *nlh,
3292                                   struct nlattr **tb,
3293                                   struct netlink_ext_ack *extack)
3294 {
3295         struct ifinfomsg *ifm;
3296         int i, err;
3297 
3298         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
3299                 NL_SET_ERR_MSG(extack, "Invalid header for get link");
3300                 return -EINVAL;
3301         }
3302 
3303         if (!netlink_strict_get_check(skb))
3304                 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3305                                               ifla_policy, extack);
3306 
3307         ifm = nlmsg_data(nlh);
3308         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
3309             ifm->ifi_change) {
3310                 NL_SET_ERR_MSG(extack, "Invalid values in header for get link request");
3311                 return -EINVAL;
3312         }
3313 
3314         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
3315                                             ifla_policy, extack);
3316         if (err)
3317                 return err;
3318 
3319         for (i = 0; i <= IFLA_MAX; i++) {
3320                 if (!tb[i])
3321                         continue;
3322 
3323                 switch (i) {
3324                 case IFLA_IFNAME:
3325                 case IFLA_EXT_MASK:
3326                 case IFLA_TARGET_NETNSID:
3327                         break;
3328                 default:
3329                         NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request");
3330                         return -EINVAL;
3331                 }
3332         }
3333 
3334         return 0;
3335 }
3336 
3337 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3338                         struct netlink_ext_ack *extack)
3339 {
3340         struct net *net = sock_net(skb->sk);
3341         struct net *tgt_net = net;
3342         struct ifinfomsg *ifm;
3343         char ifname[IFNAMSIZ];
3344         struct nlattr *tb[IFLA_MAX+1];
3345         struct net_device *dev = NULL;
3346         struct sk_buff *nskb;
3347         int netnsid = -1;
3348         int err;
3349         u32 ext_filter_mask = 0;
3350 
3351         err = rtnl_valid_getlink_req(skb, nlh, tb, extack);
3352         if (err < 0)
3353                 return err;
3354 
3355         err = rtnl_ensure_unique_netns(tb, extack, true);
3356         if (err < 0)
3357                 return err;
3358 
3359         if (tb[IFLA_TARGET_NETNSID]) {
3360                 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3361                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3362                 if (IS_ERR(tgt_net))
3363                         return PTR_ERR(tgt_net);
3364         }
3365 
3366         if (tb[IFLA_IFNAME])
3367                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3368 
3369         if (tb[IFLA_EXT_MASK])
3370                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3371 
3372         err = -EINVAL;
3373         ifm = nlmsg_data(nlh);
3374         if (ifm->ifi_index > 0)
3375                 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3376         else if (tb[IFLA_IFNAME])
3377                 dev = __dev_get_by_name(tgt_net, ifname);
3378         else
3379                 goto out;
3380 
3381         err = -ENODEV;
3382         if (dev == NULL)
3383                 goto out;
3384 
3385         err = -ENOBUFS;
3386         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3387         if (nskb == NULL)
3388                 goto out;
3389 
3390         err = rtnl_fill_ifinfo(nskb, dev, net,
3391                                RTM_NEWLINK, NETLINK_CB(skb).portid,
3392                                nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3393                                0, NULL, 0, netnsid, GFP_KERNEL);
3394         if (err < 0) {
3395                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
3396                 WARN_ON(err == -EMSGSIZE);
3397                 kfree_skb(nskb);
3398         } else
3399                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3400 out:
3401         if (netnsid >= 0)
3402                 put_net(tgt_net);
3403 
3404         return err;
3405 }
3406 
3407 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
3408 {
3409         struct net *net = sock_net(skb->sk);
3410         struct net_device *dev;
3411         struct nlattr *tb[IFLA_MAX+1];
3412         u32 ext_filter_mask = 0;
3413         u16 min_ifinfo_dump_size = 0;
3414         int hdrlen;
3415 
3416         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3417         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3418                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3419 
3420         if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3421                 if (tb[IFLA_EXT_MASK])
3422                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3423         }
3424 
3425         if (!ext_filter_mask)
3426                 return NLMSG_GOODSIZE;
3427         /*
3428          * traverse the list of net devices and compute the minimum
3429          * buffer size based upon the filter mask.
3430          */
3431         rcu_read_lock();
3432         for_each_netdev_rcu(net, dev) {
3433                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
3434                                              if_nlmsg_size(dev,
3435                                                            ext_filter_mask));
3436         }
3437         rcu_read_unlock();
3438 
3439         return nlmsg_total_size(min_ifinfo_dump_size);
3440 }
3441 
3442 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3443 {
3444         int idx;
3445         int s_idx = cb->family;
3446         int type = cb->nlh->nlmsg_type - RTM_BASE;
3447         int ret = 0;
3448 
3449         if (s_idx == 0)
3450                 s_idx = 1;
3451 
3452         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3453                 struct rtnl_link **tab;
3454                 struct rtnl_link *link;
3455                 rtnl_dumpit_func dumpit;
3456 
3457                 if (idx < s_idx || idx == PF_PACKET)
3458                         continue;
3459 
3460                 if (type < 0 || type >= RTM_NR_MSGTYPES)
3461                         continue;
3462 
3463                 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3464                 if (!tab)
3465                         continue;
3466 
3467                 link = tab[type];
3468                 if (!link)
3469                         continue;
3470 
3471                 dumpit = link->dumpit;
3472                 if (!dumpit)
3473                         continue;
3474 
3475                 if (idx > s_idx) {
3476                         memset(&cb->args[0], 0, sizeof(cb->args));
3477                         cb->prev_seq = 0;
3478                         cb->seq = 0;
3479                 }
3480                 ret = dumpit(skb, cb);
3481                 if (ret)
3482                         break;
3483         }
3484         cb->family = idx;
3485 
3486         return skb->len ? : ret;
3487 }
3488 
3489 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3490                                        unsigned int change,
3491                                        u32 event, gfp_t flags, int *new_nsid,
3492                                        int new_ifindex)
3493 {
3494         struct net *net = dev_net(dev);
3495         struct sk_buff *skb;
3496         int err = -ENOBUFS;
3497         size_t if_info_size;
3498 
3499         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
3500         if (skb == NULL)
3501                 goto errout;
3502 
3503         err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3504                                type, 0, 0, change, 0, 0, event,
3505                                new_nsid, new_ifindex, -1, flags);
3506         if (err < 0) {
3507                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
3508                 WARN_ON(err == -EMSGSIZE);
3509                 kfree_skb(skb);
3510                 goto errout;
3511         }
3512         return skb;
3513 errout:
3514         if (err < 0)
3515                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3516         return NULL;
3517 }
3518 
3519 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
3520 {
3521         struct net *net = dev_net(dev);
3522 
3523         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3524 }
3525 
3526 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3527                                unsigned int change, u32 event,
3528                                gfp_t flags, int *new_nsid, int new_ifindex)
3529 {
3530         struct sk_buff *skb;
3531 
3532         if (dev->reg_state != NETREG_REGISTERED)
3533                 return;
3534 
3535         skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
3536                                      new_ifindex);
3537         if (skb)
3538                 rtmsg_ifinfo_send(skb, dev, flags);
3539 }
3540 
3541 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3542                   gfp_t flags)
3543 {
3544         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3545                            NULL, 0);
3546 }
3547 
3548 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3549                          gfp_t flags, int *new_nsid, int new_ifindex)
3550 {
3551         rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3552                            new_nsid, new_ifindex);
3553 }
3554 
3555 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3556                                    struct net_device *dev,
3557                                    u8 *addr, u16 vid, u32 pid, u32 seq,
3558                                    int type, unsigned int flags,
3559                                    int nlflags, u16 ndm_state)
3560 {
3561         struct nlmsghdr *nlh;
3562         struct ndmsg *ndm;
3563 
3564         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3565         if (!nlh)
3566                 return -EMSGSIZE;
3567 
3568         ndm = nlmsg_data(nlh);
3569         ndm->ndm_family  = AF_BRIDGE;
3570         ndm->ndm_pad1    = 0;
3571         ndm->ndm_pad2    = 0;
3572         ndm->ndm_flags   = flags;
3573         ndm->ndm_type    = 0;
3574         ndm->ndm_ifindex = dev->ifindex;
3575         ndm->ndm_state   = ndm_state;
3576 
3577         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3578                 goto nla_put_failure;
3579         if (vid)
3580                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3581                         goto nla_put_failure;
3582 
3583         nlmsg_end(skb, nlh);
3584         return 0;
3585 
3586 nla_put_failure:
3587         nlmsg_cancel(skb, nlh);
3588         return -EMSGSIZE;
3589 }
3590 
3591 static inline size_t rtnl_fdb_nlmsg_size(void)
3592 {
3593         return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3594                nla_total_size(ETH_ALEN) +       /* NDA_LLADDR */
3595                nla_total_size(sizeof(u16)) +    /* NDA_VLAN */
3596                0;
3597 }
3598 
3599 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
3600                             u16 ndm_state)
3601 {
3602         struct net *net = dev_net(dev);
3603         struct sk_buff *skb;
3604         int err = -ENOBUFS;
3605 
3606         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
3607         if (!skb)
3608                 goto errout;
3609 
3610         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
3611                                       0, 0, type, NTF_SELF, 0, ndm_state);
3612         if (err < 0) {
3613                 kfree_skb(skb);
3614                 goto errout;
3615         }
3616 
3617         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3618         return;
3619 errout:
3620         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3621 }
3622 
3623 /*
3624  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
3625  */
3626 int ndo_dflt_fdb_add(struct ndmsg *ndm,
3627                      struct nlattr *tb[],
3628                      struct net_device *dev,
3629                      const unsigned char *addr, u16 vid,
3630                      u16 flags)
3631 {
3632         int err = -EINVAL;
3633 
3634         /* If aging addresses are supported device will need to
3635          * implement its own handler for this.
3636          */
3637         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
3638                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3639                 return err;
3640         }
3641 
3642         if (vid) {
3643                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
3644                 return err;
3645         }
3646 
3647         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3648                 err = dev_uc_add_excl(dev, addr);
3649         else if (is_multicast_ether_addr(addr))
3650                 err = dev_mc_add_excl(dev, addr);
3651 
3652         /* Only return duplicate errors if NLM_F_EXCL is set */
3653         if (err == -EEXIST && !(flags & NLM_F_EXCL))
3654                 err = 0;
3655 
3656         return err;
3657 }
3658 EXPORT_SYMBOL(ndo_dflt_fdb_add);
3659 
3660 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
3661                          struct netlink_ext_ack *extack)
3662 {
3663         u16 vid = 0;
3664 
3665         if (vlan_attr) {
3666                 if (nla_len(vlan_attr) != sizeof(u16)) {
3667                         NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
3668                         return -EINVAL;
3669                 }
3670 
3671                 vid = nla_get_u16(vlan_attr);
3672 
3673                 if (!vid || vid >= VLAN_VID_MASK) {
3674                         NL_SET_ERR_MSG(extack, "invalid vlan id");
3675                         return -EINVAL;
3676                 }
3677         }
3678         *p_vid = vid;
3679         return 0;
3680 }
3681 
3682 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3683                         struct netlink_ext_ack *extack)
3684 {
3685         struct net *net = sock_net(skb->sk);
3686         struct ndmsg *ndm;
3687         struct nlattr *tb[NDA_MAX+1];
3688         struct net_device *dev;
3689         u8 *addr;
3690         u16 vid;
3691         int err;
3692 
3693         err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
3694                                      extack);
3695         if (err < 0)
3696                 return err;
3697 
3698         ndm = nlmsg_data(nlh);
3699         if (ndm->ndm_ifindex == 0) {
3700                 NL_SET_ERR_MSG(extack, "invalid ifindex");
3701                 return -EINVAL;
3702         }
3703 
3704         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3705         if (dev == NULL) {
3706                 NL_SET_ERR_MSG(extack, "unknown ifindex");
3707                 return -ENODEV;
3708         }
3709 
3710         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3711                 NL_SET_ERR_MSG(extack, "invalid address");
3712                 return -EINVAL;
3713         }
3714 
3715         if (dev->type != ARPHRD_ETHER) {
3716                 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
3717                 return -EINVAL;
3718         }
3719 
3720         addr = nla_data(tb[NDA_LLADDR]);
3721 
3722         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3723         if (err)
3724                 return err;
3725 
3726         err = -EOPNOTSUPP;
3727 
3728         /* Support fdb on master device the net/bridge default case */
3729         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3730             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3731                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3732                 const struct net_device_ops *ops = br_dev->netdev_ops;
3733 
3734                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
3735                                        nlh->nlmsg_flags, extack);
3736                 if (err)
3737                         goto out;
3738                 else
3739                         ndm->ndm_flags &= ~NTF_MASTER;
3740         }
3741 
3742         /* Embedded bridge, macvlan, and any other device support */
3743         if ((ndm->ndm_flags & NTF_SELF)) {
3744                 if (dev->netdev_ops->ndo_fdb_add)
3745                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
3746                                                            vid,
3747                                                            nlh->nlmsg_flags,
3748                                                            extack);
3749                 else
3750                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3751                                                nlh->nlmsg_flags);
3752 
3753                 if (!err) {
3754                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3755                                         ndm->ndm_state);
3756                         ndm->ndm_flags &= ~NTF_SELF;
3757                 }
3758         }
3759 out:
3760         return err;
3761 }
3762 
3763 /*
3764  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3765  */
3766 int ndo_dflt_fdb_del(struct ndmsg *ndm,
3767                      struct nlattr *tb[],
3768                      struct net_device *dev,
3769                      const unsigned char *addr, u16 vid)
3770 {
3771         int err = -EINVAL;
3772 
3773         /* If aging addresses are supported device will need to
3774          * implement its own handler for this.
3775          */
3776         if (!(ndm->ndm_state & NUD_PERMANENT)) {
3777                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3778                 return err;
3779         }
3780 
3781         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3782                 err = dev_uc_del(dev, addr);
3783         else if (is_multicast_ether_addr(addr))
3784                 err = dev_mc_del(dev, addr);
3785 
3786         return err;
3787 }
3788 EXPORT_SYMBOL(ndo_dflt_fdb_del);
3789 
3790 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
3791                         struct netlink_ext_ack *extack)
3792 {
3793         struct net *net = sock_net(skb->sk);
3794         struct ndmsg *ndm;
3795         struct nlattr *tb[NDA_MAX+1];
3796         struct net_device *dev;
3797         int err = -EINVAL;
3798         __u8 *addr;
3799         u16 vid;
3800 
3801         if (!netlink_capable(skb, CAP_NET_ADMIN))
3802                 return -EPERM;
3803 
3804         err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
3805                                      extack);
3806         if (err < 0)
3807                 return err;
3808 
3809         ndm = nlmsg_data(nlh);
3810         if (ndm->ndm_ifindex == 0) {
3811                 NL_SET_ERR_MSG(extack, "invalid ifindex");
3812                 return -EINVAL;
3813         }
3814 
3815         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3816         if (dev == NULL) {
3817                 NL_SET_ERR_MSG(extack, "unknown ifindex");
3818                 return -ENODEV;
3819         }
3820 
3821         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3822                 NL_SET_ERR_MSG(extack, "invalid address");
3823                 return -EINVAL;
3824         }
3825 
3826         if (dev->type != ARPHRD_ETHER) {
3827                 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
3828                 return -EINVAL;
3829         }
3830 
3831         addr = nla_data(tb[NDA_LLADDR]);
3832 
3833         err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3834         if (err)
3835                 return err;
3836 
3837         err = -EOPNOTSUPP;
3838 
3839         /* Support fdb on master device the net/bridge default case */
3840         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3841             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3842                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3843                 const struct net_device_ops *ops = br_dev->netdev_ops;
3844 
3845                 if (ops->ndo_fdb_del)
3846                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
3847 
3848                 if (err)
3849                         goto out;
3850                 else
3851                         ndm->ndm_flags &= ~NTF_MASTER;
3852         }
3853 
3854         /* Embedded bridge, macvlan, and any other device support */
3855         if (ndm->ndm_flags & NTF_SELF) {
3856                 if (dev->netdev_ops->ndo_fdb_del)
3857                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
3858                                                            vid);
3859                 else
3860                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
3861 
3862                 if (!err) {
3863                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
3864                                         ndm->ndm_state);
3865                         ndm->ndm_flags &= ~NTF_SELF;
3866                 }
3867         }
3868 out:
3869         return err;
3870 }
3871 
3872 static int nlmsg_populate_fdb(struct sk_buff *skb,
3873                               struct netlink_callback *cb,
3874                               struct net_device *dev,
3875                               int *idx,
3876                               struct netdev_hw_addr_list *list)
3877 {
3878         struct netdev_hw_addr *ha;
3879         int err;
3880         u32 portid, seq;
3881 
3882         portid = NETLINK_CB(cb->skb).portid;
3883         seq = cb->nlh->nlmsg_seq;
3884 
3885         list_for_each_entry(ha, &list->list, list) {
3886                 if (*idx < cb->args[2])
3887                         goto skip;
3888 
3889                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
3890                                               portid, seq,
3891                                               RTM_NEWNEIGH, NTF_SELF,
3892                                               NLM_F_MULTI, NUD_PERMANENT);
3893                 if (err < 0)
3894                         return err;
3895 skip:
3896                 *idx += 1;
3897         }
3898         return 0;
3899 }
3900 
3901 /**
3902  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
3903  * @skb: socket buffer to store message in
3904  * @cb: netlink callback
3905  * @dev: netdevice
3906  * @filter_dev: ignored
3907  * @idx: the number of FDB table entries dumped is added to *@idx
3908  *
3909  * Default netdevice operation to dump the existing unicast address list.
3910  * Returns number of addresses from list put in skb.
3911  */
3912 int ndo_dflt_fdb_dump(struct sk_buff *skb,
3913                       struct netlink_callback *cb,
3914                       struct net_device *dev,
3915                       struct net_device *filter_dev,
3916                       int *idx)
3917 {
3918         int err;
3919 
3920         if (dev->type != ARPHRD_ETHER)
3921                 return -EINVAL;
3922 
3923         netif_addr_lock_bh(dev);
3924         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
3925         if (err)
3926                 goto out;
3927         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
3928 out:
3929         netif_addr_unlock_bh(dev);
3930         return err;
3931 }
3932 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3933 
3934 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
3935                                  int *br_idx, int *brport_idx,
3936                                  struct netlink_ext_ack *extack)
3937 {
3938         struct nlattr *tb[NDA_MAX + 1];
3939         struct ndmsg *ndm;
3940         int err, i;
3941 
3942         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
3943                 NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
3944                 return -EINVAL;
3945         }
3946 
3947         ndm = nlmsg_data(nlh);
3948         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
3949             ndm->ndm_flags || ndm->ndm_type) {
3950                 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request");
3951                 return -EINVAL;
3952         }
3953 
3954         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
3955                                             NDA_MAX, NULL, extack);
3956         if (err < 0)
3957                 return err;
3958 
3959         *brport_idx = ndm->ndm_ifindex;
3960         for (i = 0; i <= NDA_MAX; ++i) {
3961                 if (!tb[i])
3962                         continue;
3963 
3964                 switch (i) {
3965                 case NDA_IFINDEX:
3966                         if (nla_len(tb[i]) != sizeof(u32)) {
3967                                 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
3968                                 return -EINVAL;
3969                         }
3970                         *brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
3971                         break;
3972                 case NDA_MASTER:
3973                         if (nla_len(tb[i]) != sizeof(u32)) {
3974                                 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
3975                                 return -EINVAL;
3976                         }
3977                         *br_idx = nla_get_u32(tb[NDA_MASTER]);
3978                         break;
3979                 default:
3980                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
3981                         return -EINVAL;
3982                 }
3983         }
3984 
3985         return 0;
3986 }
3987 
3988 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
3989                                  int *br_idx, int *brport_idx,
3990                                  struct netlink_ext_ack *extack)
3991 {
3992         struct nlattr *tb[IFLA_MAX+1];
3993         int err;
3994 
3995         /* A hack to preserve kernel<->userspace interface.
3996          * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
3997          * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
3998          * So, check for ndmsg with an optional u32 attribute (not used here).
3999          * Fortunately these sizes don't conflict with the size of ifinfomsg
4000          * with an optional attribute.
4001          */
4002         if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
4003             (nlmsg_len(nlh) != sizeof(struct ndmsg) +
4004              nla_attr_size(sizeof(u32)))) {
4005                 struct ifinfomsg *ifm;
4006 
4007                 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4008                                              tb, IFLA_MAX, ifla_policy,
4009                                              extack);
4010                 if (err < 0) {
4011                         return -EINVAL;
4012                 } else if (err == 0) {
4013                         if (tb[IFLA_MASTER])
4014                                 *br_idx = nla_get_u32(tb[IFLA_MASTER]);
4015                 }
4016 
4017                 ifm = nlmsg_data(nlh);
4018                 *brport_idx = ifm->ifi_index;
4019         }
4020         return 0;
4021 }
4022 
4023 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
4024 {
4025         struct net_device *dev;
4026         struct net_device *br_dev = NULL;
4027         const struct net_device_ops *ops = NULL;
4028         const struct net_device_ops *cops = NULL;
4029         struct net *net = sock_net(skb->sk);
4030         struct hlist_head *head;
4031         int brport_idx = 0;
4032         int br_idx = 0;
4033         int h, s_h;
4034         int idx = 0, s_idx;
4035         int err = 0;
4036         int fidx = 0;
4037 
4038         if (cb->strict_check)
4039                 err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
4040                                             cb->extack);
4041         else
4042                 err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
4043                                             cb->extack);
4044         if (err < 0)
4045                 return err;
4046 
4047         if (br_idx) {
4048                 br_dev = __dev_get_by_index(net, br_idx);
4049                 if (!br_dev)
4050                         return -ENODEV;
4051 
4052                 ops = br_dev->netdev_ops;
4053         }
4054 
4055         s_h = cb->args[0];
4056         s_idx = cb->args[1];
4057 
4058         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4059                 idx = 0;
4060                 head = &net->dev_index_head[h];
4061                 hlist_for_each_entry(dev, head, index_hlist) {
4062 
4063                         if (brport_idx && (dev->ifindex != brport_idx))
4064                                 continue;
4065 
4066                         if (!br_idx) { /* user did not specify a specific bridge */
4067                                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
4068                                         br_dev = netdev_master_upper_dev_get(dev);
4069                                         cops = br_dev->netdev_ops;
4070                                 }
4071                         } else {
4072                                 if (dev != br_dev &&
4073                                     !(dev->priv_flags & IFF_BRIDGE_PORT))
4074                                         continue;
4075 
4076                                 if (br_dev != netdev_master_upper_dev_get(dev) &&
4077                                     !(dev->priv_flags & IFF_EBRIDGE))
4078                                         continue;
4079                                 cops = ops;
4080                         }
4081 
4082                         if (idx < s_idx)
4083                                 goto cont;
4084 
4085                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
4086                                 if (cops && cops->ndo_fdb_dump) {
4087                                         err = cops->ndo_fdb_dump(skb, cb,
4088                                                                 br_dev, dev,
4089                                                                 &fidx);
4090                                         if (err == -EMSGSIZE)
4091                                                 goto out;
4092                                 }
4093                         }
4094 
4095                         if (dev->netdev_ops->ndo_fdb_dump)
4096                                 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
4097                                                                     dev, NULL,
4098                                                                     &fidx);
4099                         else
4100                                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
4101                                                         &fidx);
4102                         if (err == -EMSGSIZE)
4103                                 goto out;
4104 
4105                         cops = NULL;
4106 
4107                         /* reset fdb offset to 0 for rest of the interfaces */
4108                         cb->args[2] = 0;
4109                         fidx = 0;
4110 cont:
4111                         idx++;
4112                 }
4113         }
4114 
4115 out:
4116         cb->args[0] = h;
4117         cb->args[1] = idx;
4118         cb->args[2] = fidx;
4119 
4120         return skb->len;
4121 }
4122 
4123 static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
4124                                 struct nlattr **tb, u8 *ndm_flags,
4125                                 int *br_idx, int *brport_idx, u8 **addr,
4126                                 u16 *vid, struct netlink_ext_ack *extack)
4127 {
4128         struct ndmsg *ndm;
4129         int err, i;
4130 
4131         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4132                 NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
4133                 return -EINVAL;
4134         }
4135 
4136         ndm = nlmsg_data(nlh);
4137         if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4138             ndm->ndm_type) {
4139                 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
4140                 return -EINVAL;
4141         }
4142 
4143         if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
4144                 NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
4145                 return -EINVAL;
4146         }
4147 
4148         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4149                                             NDA_MAX, nda_policy, extack);
4150         if (err < 0)
4151                 return err;
4152 
4153         *ndm_flags = ndm->ndm_flags;
4154         *brport_idx = ndm->ndm_ifindex;
4155         for (i = 0; i <= NDA_MAX; ++i) {
4156                 if (!tb[i])
4157                         continue;
4158 
4159                 switch (i) {
4160                 case NDA_MASTER:
4161                         *br_idx = nla_get_u32(tb[i]);
4162                         break;
4163                 case NDA_LLADDR:
4164                         if (nla_len(tb[i]) != ETH_ALEN) {
4165                                 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
4166                                 return -EINVAL;
4167                         }
4168                         *addr = nla_data(tb[i]);
4169                         break;
4170                 case NDA_VLAN:
4171                         err = fdb_vid_parse(tb[i], vid, extack);
4172                         if (err)
4173                                 return err;
4174                         break;
4175                 case NDA_VNI:
4176                         break;
4177                 default:
4178                         NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
4179                         return -EINVAL;
4180                 }
4181         }
4182 
4183         return 0;
4184 }
4185 
4186 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4187                         struct netlink_ext_ack *extack)
4188 {
4189         struct net_device *dev = NULL, *br_dev = NULL;
4190         const struct net_device_ops *ops = NULL;
4191         struct net *net = sock_net(in_skb->sk);
4192         struct nlattr *tb[NDA_MAX + 1];
4193         struct sk_buff *skb;
4194         int brport_idx = 0;
4195         u8 ndm_flags = 0;
4196         int br_idx = 0;
4197         u8 *addr = NULL;
4198         u16 vid = 0;
4199         int err;
4200 
4201         err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
4202                                    &brport_idx, &addr, &vid, extack);
4203         if (err < 0)
4204                 return err;
4205 
4206         if (!addr) {
4207                 NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
4208                 return -EINVAL;
4209         }
4210 
4211         if (brport_idx) {
4212                 dev = __dev_get_by_index(net, brport_idx);
4213                 if (!dev) {
4214                         NL_SET_ERR_MSG(extack, "Unknown device ifindex");
4215                         return -ENODEV;
4216                 }
4217         }
4218 
4219         if (br_idx) {
4220                 if (dev) {
4221                         NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
4222                         return -EINVAL;
4223                 }
4224 
4225                 br_dev = __dev_get_by_index(net, br_idx);
4226                 if (!br_dev) {
4227                         NL_SET_ERR_MSG(extack, "Invalid master ifindex");
4228                         return -EINVAL;
4229                 }
4230                 ops = br_dev->netdev_ops;
4231         }
4232 
4233         if (dev) {
4234                 if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
4235                         if (!(dev->priv_flags & IFF_BRIDGE_PORT)) {
4236                                 NL_SET_ERR_MSG(extack, "Device is not a bridge port");
4237                                 return -EINVAL;
4238                         }
4239                         br_dev = netdev_master_upper_dev_get(dev);
4240                         if (!br_dev) {
4241                                 NL_SET_ERR_MSG(extack, "Master of device not found");
4242                                 return -EINVAL;
4243                         }
4244                         ops = br_dev->netdev_ops;
4245                 } else {
4246                         if (!(ndm_flags & NTF_SELF)) {
4247                                 NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
4248                                 return -EINVAL;
4249                         }
4250                         ops = dev->netdev_ops;
4251                 }
4252         }
4253 
4254         if (!br_dev && !dev) {
4255                 NL_SET_ERR_MSG(extack, "No device specified");
4256                 return -ENODEV;
4257         }
4258 
4259         if (!ops || !ops->ndo_fdb_get) {
4260                 NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
4261                 return -EOPNOTSUPP;
4262         }
4263 
4264         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4265         if (!skb)
4266                 return -ENOBUFS;
4267 
4268         if (br_dev)
4269                 dev = br_dev;
4270         err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
4271                                NETLINK_CB(in_skb).portid,
4272                                nlh->nlmsg_seq, extack);
4273         if (err)
4274                 goto out;
4275 
4276         return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4277 out:
4278         kfree_skb(skb);
4279         return err;
4280 }
4281 
4282 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
4283                                unsigned int attrnum, unsigned int flag)
4284 {
4285         if (mask & flag)
4286                 return nla_put_u8(skb, attrnum, !!(flags & flag));
4287         return 0;
4288 }
4289 
4290 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
4291                             struct net_device *dev, u16 mode,
4292                             u32 flags, u32 mask, int nlflags,
4293                             u32 filter_mask,
4294                             int (*vlan_fill)(struct sk_buff *skb,
4295                                              struct net_device *dev,
4296                                              u32 filter_mask))
4297 {
4298         struct nlmsghdr *nlh;
4299         struct ifinfomsg *ifm;
4300         struct nlattr *br_afspec;
4301         struct nlattr *protinfo;
4302         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
4303         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4304         int err = 0;
4305 
4306         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
4307         if (nlh == NULL)
4308                 return -EMSGSIZE;
4309 
4310         ifm = nlmsg_data(nlh);
4311         ifm->ifi_family = AF_BRIDGE;
4312         ifm->__ifi_pad = 0;
4313         ifm->ifi_type = dev->type;
4314         ifm->ifi_index = dev->ifindex;
4315         ifm->ifi_flags = dev_get_flags(dev);
4316         ifm->ifi_change = 0;
4317 
4318 
4319         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4320             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4321             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
4322             (br_dev &&
4323              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
4324             (dev->addr_len &&
4325              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4326             (dev->ifindex != dev_get_iflink(dev) &&
4327              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4328                 goto nla_put_failure;
4329 
4330         br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
4331         if (!br_afspec)
4332                 goto nla_put_failure;
4333 
4334         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
4335                 nla_nest_cancel(skb, br_afspec);
4336                 goto nla_put_failure;
4337         }
4338 
4339         if (mode != BRIDGE_MODE_UNDEF) {
4340                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
4341                         nla_nest_cancel(skb, br_afspec);
4342                         goto nla_put_failure;
4343                 }
4344         }
4345         if (vlan_fill) {
4346                 err = vlan_fill(skb, dev, filter_mask);
4347                 if (err) {
4348                         nla_nest_cancel(skb, br_afspec);
4349                         goto nla_put_failure;
4350                 }
4351         }
4352         nla_nest_end(skb, br_afspec);
4353 
4354         protinfo = nla_nest_start(skb, IFLA_PROTINFO);
4355         if (!protinfo)
4356                 goto nla_put_failure;
4357 
4358         if (brport_nla_put_flag(skb, flags, mask,
4359                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
4360             brport_nla_put_flag(skb, flags, mask,
4361                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
4362             brport_nla_put_flag(skb, flags, mask,
4363                                 IFLA_BRPORT_FAST_LEAVE,
4364                                 BR_MULTICAST_FAST_LEAVE) ||
4365             brport_nla_put_flag(skb, flags, mask,
4366                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
4367             brport_nla_put_flag(skb, flags, mask,
4368                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
4369             brport_nla_put_flag(skb, flags, mask,
4370                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
4371             brport_nla_put_flag(skb, flags, mask,
4372                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
4373             brport_nla_put_flag(skb, flags, mask,
4374                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
4375                 nla_nest_cancel(skb, protinfo);
4376                 goto nla_put_failure;
4377         }
4378 
4379         nla_nest_end(skb, protinfo);
4380 
4381         nlmsg_end(skb, nlh);
4382         return 0;
4383 nla_put_failure:
4384         nlmsg_cancel(skb, nlh);
4385         return err ? err : -EMSGSIZE;
4386 }
4387 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
4388 
4389 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
4390                                     bool strict_check, u32 *filter_mask,
4391                                     struct netlink_ext_ack *extack)
4392 {
4393         struct nlattr *tb[IFLA_MAX+1];
4394         int err, i;
4395 
4396         if (strict_check) {
4397                 struct ifinfomsg *ifm;
4398 
4399                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
4400                         NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
4401                         return -EINVAL;
4402                 }
4403 
4404                 ifm = nlmsg_data(nlh);
4405                 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
4406                     ifm->ifi_change || ifm->ifi_index) {
4407                         NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
4408                         return -EINVAL;
4409                 }
4410 
4411                 err = nlmsg_parse_deprecated_strict(nlh,
4412                                                     sizeof(struct ifinfomsg),
4413                                                     tb, IFLA_MAX, ifla_policy,
4414                                                     extack);
4415         } else {
4416                 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4417                                              tb, IFLA_MAX, ifla_policy,
4418                                              extack);
4419         }
4420         if (err < 0)
4421                 return err;
4422 
4423         /* new attributes should only be added with strict checking */
4424         for (i = 0; i <= IFLA_MAX; ++i) {
4425                 if (!tb[i])
4426                         continue;
4427 
4428                 switch (i) {
4429                 case IFLA_EXT_MASK:
4430                         *filter_mask = nla_get_u32(tb[i]);
4431                         break;
4432                 default:
4433                         if (strict_check) {
4434                                 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
4435                                 return -EINVAL;
4436                         }
4437                 }
4438         }
4439 
4440         return 0;
4441 }
4442 
4443 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
4444 {
4445         const struct nlmsghdr *nlh = cb->nlh;
4446         struct net *net = sock_net(skb->sk);
4447         struct net_device *dev;
4448         int idx = 0;
4449         u32 portid = NETLINK_CB(cb->skb).portid;
4450         u32 seq = nlh->nlmsg_seq;
4451         u32 filter_mask = 0;
4452         int err;
4453 
4454         err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
4455                                        cb->extack);
4456         if (err < 0 && cb->strict_check)
4457                 return err;
4458 
4459         rcu_read_lock();
4460         for_each_netdev_rcu(net, dev) {
4461                 const struct net_device_ops *ops = dev->netdev_ops;
4462                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4463 
4464                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
4465                         if (idx >= cb->args[0]) {
4466                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
4467                                                 skb, portid, seq, dev,
4468                                                 filter_mask, NLM_F_MULTI);
4469                                 if (err < 0 && err != -EOPNOTSUPP) {
4470                                         if (likely(skb->len))
4471                                                 break;
4472 
4473                                         goto out_err;
4474                                 }
4475                         }
4476                         idx++;
4477                 }
4478 
4479                 if (ops->ndo_bridge_getlink) {
4480                         if (idx >= cb->args[0]) {
4481                                 err = ops->ndo_bridge_getlink(skb, portid,
4482                                                               seq, dev,
4483                                                               filter_mask,
4484                                                               NLM_F_MULTI);
4485                                 if (err < 0 && err != -EOPNOTSUPP) {
4486                                         if (likely(skb->len))
4487                                                 break;
4488 
4489                                         goto out_err;
4490                                 }
4491                         }
4492                         idx++;
4493                 }
4494         }
4495         err = skb->len;
4496 out_err:
4497         rcu_read_unlock();
4498         cb->args[0] = idx;
4499 
4500         return err;
4501 }
4502 
4503 static inline size_t bridge_nlmsg_size(void)
4504 {
4505         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4506                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
4507                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
4508                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
4509                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
4510                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
4511                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
4512                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
4513                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
4514                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
4515                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
4516 }
4517 
4518 static int rtnl_bridge_notify(struct net_device *dev)
4519 {
4520         struct net *net = dev_net(dev);
4521         struct sk_buff *skb;
4522         int err = -EOPNOTSUPP;
4523 
4524         if (!dev->netdev_ops->ndo_bridge_getlink)
4525                 return 0;
4526 
4527         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
4528         if (!skb) {
4529                 err = -ENOMEM;
4530                 goto errout;
4531         }
4532 
4533         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
4534         if (err < 0)
4535                 goto errout;
4536 
4537         if (!skb->len)
4538                 goto errout;
4539 
4540         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
4541         return 0;
4542 errout:
4543         WARN_ON(err == -EMSGSIZE);
4544         kfree_skb(skb);
4545         if (err)
4546                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
4547         return err;
4548 }
4549 
4550 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
4551                                struct netlink_ext_ack *extack)
4552 {
4553         struct net *net = sock_net(skb->sk);
4554         struct ifinfomsg *ifm;
4555         struct net_device *dev;
4556         struct nlattr *br_spec, *attr = NULL;
4557         int rem, err = -EOPNOTSUPP;
4558         u16 flags = 0;
4559         bool have_flags = false;
4560 
4561         if (nlmsg_len(nlh) < sizeof(*ifm))
4562                 return -EINVAL;
4563 
4564         ifm = nlmsg_data(nlh);
4565         if (ifm->ifi_family != AF_BRIDGE)
4566                 return -EPFNOSUPPORT;
4567 
4568         dev = __dev_get_by_index(net, ifm->ifi_index);
4569         if (!dev) {
4570                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4571                 return -ENODEV;
4572         }
4573 
4574         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4575         if (br_spec) {
4576                 nla_for_each_nested(attr, br_spec, rem) {
4577                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4578                                 if (nla_len(attr) < sizeof(flags))
4579                                         return -EINVAL;
4580 
4581                                 have_flags = true;
4582                                 flags = nla_get_u16(attr);
4583                                 break;
4584                         }
4585                 }
4586         }
4587 
4588         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4589                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4590 
4591                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
4592                         err = -EOPNOTSUPP;
4593                         goto out;
4594                 }
4595 
4596                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
4597                                                              extack);
4598                 if (err)
4599                         goto out;
4600 
4601                 flags &= ~BRIDGE_FLAGS_MASTER;
4602         }
4603 
4604         if ((flags & BRIDGE_FLAGS_SELF)) {
4605                 if (!dev->netdev_ops->ndo_bridge_setlink)
4606                         err = -EOPNOTSUPP;
4607                 else
4608                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
4609                                                                   flags,
4610                                                                   extack);
4611                 if (!err) {
4612                         flags &= ~BRIDGE_FLAGS_SELF;
4613 
4614                         /* Generate event to notify upper layer of bridge
4615                          * change
4616                          */
4617                         err = rtnl_bridge_notify(dev);
4618                 }
4619         }
4620 
4621         if (have_flags)
4622                 memcpy(nla_data(attr), &flags, sizeof(flags));
4623 out:
4624         return err;
4625 }
4626 
4627 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
4628                                struct netlink_ext_ack *extack)
4629 {
4630         struct net *net = sock_net(skb->sk);
4631         struct ifinfomsg *ifm;
4632         struct net_device *dev;
4633         struct nlattr *br_spec, *attr = NULL;
4634         int rem, err = -EOPNOTSUPP;
4635         u16 flags = 0;
4636         bool have_flags = false;
4637 
4638         if (nlmsg_len(nlh) < sizeof(*ifm))
4639                 return -EINVAL;
4640 
4641         ifm = nlmsg_data(nlh);
4642         if (ifm->ifi_family != AF_BRIDGE)
4643                 return -EPFNOSUPPORT;
4644 
4645         dev = __dev_get_by_index(net, ifm->ifi_index);
4646         if (!dev) {
4647                 NL_SET_ERR_MSG(extack, "unknown ifindex");
4648                 return -ENODEV;
4649         }
4650 
4651         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4652         if (br_spec) {
4653                 nla_for_each_nested(attr, br_spec, rem) {
4654                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4655                                 if (nla_len(attr) < sizeof(flags))
4656                                         return -EINVAL;
4657 
4658                                 have_flags = true;
4659                                 flags = nla_get_u16(attr);
4660                                 break;
4661                         }
4662                 }
4663         }
4664 
4665         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4666                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4667 
4668                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
4669                         err = -EOPNOTSUPP;
4670                         goto out;
4671                 }
4672 
4673                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
4674                 if (err)
4675                         goto out;
4676 
4677                 flags &= ~BRIDGE_FLAGS_MASTER;
4678         }
4679 
4680         if ((flags & BRIDGE_FLAGS_SELF)) {
4681                 if (!dev->netdev_ops->ndo_bridge_dellink)
4682                         err = -EOPNOTSUPP;
4683                 else
4684                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
4685                                                                   flags);
4686 
4687                 if (!err) {
4688                         flags &= ~BRIDGE_FLAGS_SELF;
4689 
4690                         /* Generate event to notify upper layer of bridge
4691                          * change
4692                          */
4693                         err = rtnl_bridge_notify(dev);
4694                 }
4695         }
4696 
4697         if (have_flags)
4698                 memcpy(nla_data(attr), &flags, sizeof(flags));
4699 out:
4700         return err;
4701 }
4702 
4703 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
4704 {
4705         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
4706                (!idxattr || idxattr == attrid);
4707 }
4708 
4709 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
4710 static int rtnl_get_offload_stats_attr_size(int attr_id)
4711 {
4712         switch (attr_id) {
4713         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
4714                 return sizeof(struct rtnl_link_stats64);
4715         }
4716 
4717         return 0;
4718 }
4719 
4720 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
4721                                   int *prividx)
4722 {
4723         struct nlattr *attr = NULL;
4724         int attr_id, size;
4725         void *attr_data;
4726         int err;
4727 
4728         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4729               dev->netdev_ops->ndo_get_offload_stats))
4730                 return -ENODATA;
4731 
4732         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4733              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4734                 if (attr_id < *prividx)
4735                         continue;
4736 
4737                 size = rtnl_get_offload_stats_attr_size(attr_id);
4738                 if (!size)
4739                         continue;
4740 
4741                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4742                         continue;
4743 
4744                 attr = nla_reserve_64bit(skb, attr_id, size,
4745                                          IFLA_OFFLOAD_XSTATS_UNSPEC);
4746                 if (!attr)
4747                         goto nla_put_failure;
4748 
4749                 attr_data = nla_data(attr);
4750                 memset(attr_data, 0, size);
4751                 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
4752                                                              attr_data);
4753                 if (err)
4754                         goto get_offload_stats_failure;
4755         }
4756 
4757         if (!attr)
4758                 return -ENODATA;
4759 
4760         *prividx = 0;
4761         return 0;
4762 
4763 nla_put_failure:
4764         err = -EMSGSIZE;
4765 get_offload_stats_failure:
4766         *prividx = attr_id;
4767         return err;
4768 }
4769 
4770 static int rtnl_get_offload_stats_size(const struct net_device *dev)
4771 {
4772         int nla_size = 0;
4773         int attr_id;
4774         int size;
4775 
4776         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4777               dev->netdev_ops->ndo_get_offload_stats))
4778                 return 0;
4779 
4780         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4781              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4782                 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4783                         continue;
4784                 size = rtnl_get_offload_stats_attr_size(attr_id);
4785                 nla_size += nla_total_size_64bit(size);
4786         }
4787 
4788         if (nla_size != 0)
4789                 nla_size += nla_total_size(0);
4790 
4791         return nla_size;
4792 }
4793 
4794 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
4795                                int type, u32 pid, u32 seq, u32 change,
4796                                unsigned int flags, unsigned int filter_mask,
4797                                int *idxattr, int *prividx)
4798 {
4799         struct if_stats_msg *ifsm;
4800         struct nlmsghdr *nlh;
4801         struct nlattr *attr;
4802         int s_prividx = *prividx;
4803         int err;
4804 
4805         ASSERT_RTNL();
4806 
4807         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
4808         if (!nlh)
4809                 return -EMSGSIZE;
4810 
4811         ifsm = nlmsg_data(nlh);
4812         ifsm->family = PF_UNSPEC;
4813         ifsm->pad1 = 0;
4814         ifsm->pad2 = 0;
4815         ifsm->ifindex = dev->ifindex;
4816         ifsm->filter_mask = filter_mask;
4817 
4818         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
4819                 struct rtnl_link_stats64 *sp;
4820 
4821                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
4822                                          sizeof(struct rtnl_link_stats64),
4823                                          IFLA_STATS_UNSPEC);
4824                 if (!attr)
4825                         goto nla_put_failure;
4826 
4827                 sp = nla_data(attr);
4828                 dev_get_stats(dev, sp);
4829         }
4830 
4831         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
4832                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4833 
4834                 if (ops && ops->fill_linkxstats) {
4835                         *idxattr = IFLA_STATS_LINK_XSTATS;
4836                         attr = nla_nest_start_noflag(skb,
4837                                                      IFLA_STATS_LINK_XSTATS);
4838                         if (!attr)
4839                                 goto nla_put_failure;
4840 
4841                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4842                         nla_nest_end(skb, attr);
4843                         if (err)
4844                                 goto nla_put_failure;
4845                         *idxattr = 0;
4846                 }
4847         }
4848 
4849         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
4850                              *idxattr)) {
4851                 const struct rtnl_link_ops *ops = NULL;
4852                 const struct net_device *master;
4853 
4854                 master = netdev_master_upper_dev_get(dev);
4855                 if (master)
4856                         ops = master->rtnl_link_ops;
4857                 if (ops && ops->fill_linkxstats) {
4858                         *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
4859                         attr = nla_nest_start_noflag(skb,
4860                                                      IFLA_STATS_LINK_XSTATS_SLAVE);
4861                         if (!attr)
4862                                 goto nla_put_failure;
4863 
4864                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4865                         nla_nest_end(skb, attr);
4866                         if (err)
4867                                 goto nla_put_failure;
4868                         *idxattr = 0;
4869                 }
4870         }
4871 
4872         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
4873                              *idxattr)) {
4874                 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
4875                 attr = nla_nest_start_noflag(skb,
4876                                              IFLA_STATS_LINK_OFFLOAD_XSTATS);
4877                 if (!attr)
4878                         goto nla_put_failure;
4879 
4880                 err = rtnl_get_offload_stats(skb, dev, prividx);
4881                 if (err == -ENODATA)
4882                         nla_nest_cancel(skb, attr);
4883                 else
4884                         nla_nest_end(skb, attr);
4885 
4886                 if (err && err != -ENODATA)
4887                         goto nla_put_failure;
4888                 *idxattr = 0;
4889         }
4890 
4891         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
4892                 struct rtnl_af_ops *af_ops;
4893 
4894                 *idxattr = IFLA_STATS_AF_SPEC;
4895                 attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC);
4896                 if (!attr)
4897                         goto nla_put_failure;
4898 
4899                 rcu_read_lock();
4900                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4901                         if (af_ops->fill_stats_af) {
4902                                 struct nlattr *af;
4903                                 int err;
4904 
4905                                 af = nla_nest_start_noflag(skb,
4906                                                            af_ops->family);
4907                                 if (!af) {
4908                                         rcu_read_unlock();
4909                                         goto nla_put_failure;
4910                                 }
4911                                 err = af_ops->fill_stats_af(skb, dev);
4912 
4913                                 if (err == -ENODATA) {
4914                                         nla_nest_cancel(skb, af);
4915                                 } else if (err < 0) {
4916                                         rcu_read_unlock();
4917                                         goto nla_put_failure;
4918                                 }
4919 
4920                                 nla_nest_end(skb, af);
4921                         }
4922                 }
4923                 rcu_read_unlock();
4924 
4925                 nla_nest_end(skb, attr);
4926 
4927                 *idxattr = 0;
4928         }
4929 
4930         nlmsg_end(skb, nlh);
4931 
4932         return 0;
4933 
4934 nla_put_failure:
4935         /* not a multi message or no progress mean a real error */
4936         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
4937                 nlmsg_cancel(skb, nlh);
4938         else
4939                 nlmsg_end(skb, nlh);
4940 
4941         return -EMSGSIZE;
4942 }
4943 
4944 static size_t if_nlmsg_stats_size(const struct net_device *dev,
4945                                   u32 filter_mask)
4946 {
4947         size_t size = 0;
4948 
4949         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
4950                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
4951 
4952         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
4953                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4954                 int attr = IFLA_STATS_LINK_XSTATS;
4955 
4956                 if (ops && ops->get_linkxstats_size) {
4957                         size += nla_total_size(ops->get_linkxstats_size(dev,
4958                                                                         attr));
4959                         /* for IFLA_STATS_LINK_XSTATS */
4960                         size += nla_total_size(0);
4961                 }
4962         }
4963 
4964         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
4965                 struct net_device *_dev = (struct net_device *)dev;
4966                 const struct rtnl_link_ops *ops = NULL;
4967                 const struct net_device *master;
4968 
4969                 /* netdev_master_upper_dev_get can't take const */
4970                 master = netdev_master_upper_dev_get(_dev);
4971                 if (master)
4972                         ops = master->rtnl_link_ops;
4973                 if (ops && ops->get_linkxstats_size) {
4974                         int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
4975 
4976                         size += nla_total_size(ops->get_linkxstats_size(dev,
4977                                                                         attr));
4978                         /* for IFLA_STATS_LINK_XSTATS_SLAVE */
4979                         size += nla_total_size(0);
4980                 }
4981         }
4982 
4983         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
4984                 size += rtnl_get_offload_stats_size(dev);
4985 
4986         if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
4987                 struct rtnl_af_ops *af_ops;
4988 
4989                 /* for IFLA_STATS_AF_SPEC */
4990                 size += nla_total_size(0);
4991 
4992                 rcu_read_lock();
4993                 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4994                         if (af_ops->get_stats_af_size) {
4995                                 size += nla_total_size(
4996                                         af_ops->get_stats_af_size(dev));
4997 
4998                                 /* for AF_* */
4999                                 size += nla_total_size(0);
5000                         }
5001                 }
5002                 rcu_read_unlock();
5003         }
5004 
5005         return size;
5006 }
5007 
5008 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check,
5009                                 bool is_dump, struct netlink_ext_ack *extack)
5010 {
5011         struct if_stats_msg *ifsm;
5012 
5013         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) {
5014                 NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
5015                 return -EINVAL;
5016         }
5017 
5018         if (!strict_check)
5019                 return 0;
5020 
5021         ifsm = nlmsg_data(nlh);
5022 
5023         /* only requests using strict checks can pass data to influence
5024          * the dump. The legacy exception is filter_mask.
5025          */
5026         if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) {
5027                 NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
5028                 return -EINVAL;
5029         }
5030         if (nlmsg_attrlen(nlh, sizeof(*ifsm))) {
5031                 NL_SET_ERR_MSG(extack, "Invalid attributes after stats header");
5032                 return -EINVAL;
5033         }
5034         if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) {
5035                 NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask");
5036                 return -EINVAL;
5037         }
5038 
5039         return 0;
5040 }
5041 
5042 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
5043                           struct netlink_ext_ack *extack)
5044 {
5045         struct net *net = sock_net(skb->sk);
5046         struct net_device *dev = NULL;
5047         int idxattr = 0, prividx = 0;
5048         struct if_stats_msg *ifsm;
5049         struct sk_buff *nskb;
5050         u32 filter_mask;
5051         int err;
5052 
5053         err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
5054                                    false, extack);
5055         if (err)
5056                 return err;
5057 
5058         ifsm = nlmsg_data(nlh);
5059         if (ifsm->ifindex > 0)
5060                 dev = __dev_get_by_index(net, ifsm->ifindex);
5061         else
5062                 return -EINVAL;
5063 
5064         if (!dev)
5065                 return -ENODEV;
5066 
5067         filter_mask = ifsm->filter_mask;
5068         if (!filter_mask)
5069                 return -EINVAL;
5070 
5071         nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
5072         if (!nskb)
5073                 return -ENOBUFS;
5074 
5075         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
5076                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
5077                                   0, filter_mask, &idxattr, &prividx);
5078         if (err < 0) {
5079                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
5080                 WARN_ON(err == -EMSGSIZE);
5081                 kfree_skb(nskb);
5082         } else {
5083                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
5084         }
5085 
5086         return err;
5087 }
5088 
5089 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
5090 {
5091         struct netlink_ext_ack *extack = cb->extack;
5092         int h, s_h, err, s_idx, s_idxattr, s_prividx;
5093         struct net *net = sock_net(skb->sk);
5094         unsigned int flags = NLM_F_MULTI;
5095         struct if_stats_msg *ifsm;
5096         struct hlist_head *head;
5097         struct net_device *dev;
5098         u32 filter_mask = 0;
5099         int idx = 0;
5100 
5101         s_h = cb->args[0];
5102         s_idx = cb->args[1];
5103         s_idxattr = cb->args[2];
5104         s_prividx = cb->args[3];
5105 
5106         cb->seq = net->dev_base_seq;
5107 
5108         err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack);
5109         if (err)
5110                 return err;
5111 
5112         ifsm = nlmsg_data(cb->nlh);
5113         filter_mask = ifsm->filter_mask;
5114         if (!filter_mask) {
5115                 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
5116                 return -EINVAL;
5117         }
5118 
5119         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5120                 idx = 0;
5121                 head = &net->dev_index_head[h];
5122                 hlist_for_each_entry(dev, head, index_hlist) {
5123                         if (idx < s_idx)
5124                                 goto cont;
5125                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
5126                                                   NETLINK_CB(cb->skb).portid,
5127                                                   cb->nlh->nlmsg_seq, 0,
5128                                                   flags, filter_mask,
5129                                                   &s_idxattr, &s_prividx);
5130                         /* If we ran out of room on the first message,
5131                          * we're in trouble
5132                          */
5133                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
5134 
5135                         if (err < 0)
5136                                 goto out;
5137                         s_prividx = 0;
5138                         s_idxattr = 0;
5139                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5140 cont:
5141                         idx++;
5142                 }
5143         }
5144 out:
5145         cb->args[3] = s_prividx;
5146         cb->args[2] = s_idxattr;
5147         cb->args[1] = idx;
5148         cb->args[0] = h;
5149 
5150         return skb->len;
5151 }
5152 
5153 /* Process one rtnetlink message. */
5154 
5155 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
5156                              struct netlink_ext_ack *extack)
5157 {
5158         struct net *net = sock_net(skb->sk);
5159         struct rtnl_link *link;
5160         struct module *owner;
5161         int err = -EOPNOTSUPP;
5162         rtnl_doit_func doit;
5163         unsigned int flags;
5164         int kind;
5165         int family;
5166         int type;
5167 
5168         type = nlh->nlmsg_type;
5169         if (type > RTM_MAX)
5170                 return -EOPNOTSUPP;
5171 
5172         type -= RTM_BASE;
5173 
5174         /* All the messages must have at least 1 byte length */
5175         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
5176                 return 0;
5177 
5178         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
5179         kind = type&3;
5180 
5181         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
5182                 return -EPERM;
5183 
5184         rcu_read_lock();
5185         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
5186                 struct sock *rtnl;
5187                 rtnl_dumpit_func dumpit;
5188                 u16 min_dump_alloc = 0;
5189 
5190                 link = rtnl_get_link(family, type);
5191                 if (!link || !link->dumpit) {
5192                         family = PF_UNSPEC;
5193                         link = rtnl_get_link(family, type);
5194                         if (!link || !link->dumpit)
5195                                 goto err_unlock;
5196                 }
5197                 owner = link->owner;
5198                 dumpit = link->dumpit;
5199 
5200                 if (type == RTM_GETLINK - RTM_BASE)
5201                         min_dump_alloc = rtnl_calcit(skb, nlh);
5202 
5203                 err = 0;
5204                 /* need to do this before rcu_read_unlock() */
5205                 if (!try_module_get(owner))
5206                         err = -EPROTONOSUPPORT;
5207 
5208                 rcu_read_unlock();
5209 
5210                 rtnl = net->rtnl;
5211                 if (err == 0) {
5212                         struct netlink_dump_control c = {
5213                                 .dump           = dumpit,
5214                                 .min_dump_alloc = min_dump_alloc,
5215                                 .module         = owner,
5216                         };
5217                         err = netlink_dump_start(rtnl, skb, nlh, &c);
5218                         /* netlink_dump_start() will keep a reference on
5219                          * module if dump is still in progress.
5220                          */
5221                         module_put(owner);
5222                 }
5223                 return err;
5224         }
5225 
5226         link = rtnl_get_link(family, type);
5227         if (!link || !link->doit) {
5228                 family = PF_UNSPEC;
5229                 link = rtnl_get_link(PF_UNSPEC, type);
5230                 if (!link || !link->doit)
5231                         goto out_unlock;
5232         }
5233 
5234         owner = link->owner;
5235         if (!try_module_get(owner)) {
5236                 err = -EPROTONOSUPPORT;
5237                 goto out_unlock;
5238         }
5239 
5240         flags = link->flags;
5241         if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
5242                 doit = link->doit;
5243                 rcu_read_unlock();
5244                 if (doit)
5245                         err = doit(skb, nlh, extack);
5246                 module_put(owner);
5247                 return err;
5248         }
5249         rcu_read_unlock();
5250 
5251         rtnl_lock();
5252         link = rtnl_get_link(family, type);
5253         if (link && link->doit)
5254                 err = link->doit(skb, nlh, extack);
5255         rtnl_unlock();
5256 
5257         module_put(owner);
5258 
5259         return err;
5260 
5261 out_unlock:
5262         rcu_read_unlock();
5263         return err;
5264 
5265 err_unlock:
5266         rcu_read_unlock();
5267         return -EOPNOTSUPP;
5268 }
5269 
5270 static void rtnetlink_rcv(struct sk_buff *skb)
5271 {
5272         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
5273 }
5274 
5275 static int rtnetlink_bind(struct net *net, int group)
5276 {
5277         switch (group) {
5278         case RTNLGRP_IPV4_MROUTE_R:
5279         case RTNLGRP_IPV6_MROUTE_R:
5280                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
5281                         return -EPERM;
5282                 break;
5283         }
5284         return 0;
5285 }
5286 
5287 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
5288 {
5289         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5290 
5291         switch (event) {
5292         case NETDEV_REBOOT:
5293         case NETDEV_CHANGEMTU:
5294         case NETDEV_CHANGEADDR:
5295         case NETDEV_CHANGENAME:
5296         case NETDEV_FEAT_CHANGE:
5297         case NETDEV_BONDING_FAILOVER:
5298         case NETDEV_POST_TYPE_CHANGE:
5299         case NETDEV_NOTIFY_PEERS:
5300         case NETDEV_CHANGEUPPER:
5301         case NETDEV_RESEND_IGMP:
5302         case NETDEV_CHANGEINFODATA:
5303         case NETDEV_CHANGELOWERSTATE:
5304         case NETDEV_CHANGE_TX_QUEUE_LEN:
5305                 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
5306                                    GFP_KERNEL, NULL, 0);
5307                 break;
5308         default:
5309                 break;
5310         }
5311         return NOTIFY_DONE;
5312 }
5313 
5314 static struct notifier_block rtnetlink_dev_notifier = {
5315         .notifier_call  = rtnetlink_event,
5316 };
5317 
5318 
5319 static int __net_init rtnetlink_net_init(struct net *net)
5320 {
5321         struct sock *sk;
5322         struct netlink_kernel_cfg cfg = {
5323                 .groups         = RTNLGRP_MAX,
5324                 .input          = rtnetlink_rcv,
5325                 .cb_mutex       = &rtnl_mutex,
5326                 .flags          = NL_CFG_F_NONROOT_RECV,
5327                 .bind           = rtnetlink_bind,
5328         };
5329 
5330         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
5331         if (!sk)
5332                 return -ENOMEM;
5333         net->rtnl = sk;
5334         return 0;
5335 }
5336 
5337 static void __net_exit rtnetlink_net_exit(struct net *net)
5338 {
5339         netlink_kernel_release(net->rtnl);
5340         net->rtnl = NULL;
5341 }
5342 
5343 static struct pernet_operations rtnetlink_net_ops = {
5344         .init = rtnetlink_net_init,
5345         .exit = rtnetlink_net_exit,
5346 };
5347 
5348 void __init rtnetlink_init(void)
5349 {
5350         if (register_pernet_subsys(&rtnetlink_net_ops))
5351                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
5352 
5353         register_netdevice_notifier(&rtnetlink_dev_notifier);
5354 
5355         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
5356                       rtnl_dump_ifinfo, 0);
5357         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
5358         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
5359         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
5360 
5361         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
5362         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
5363         rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
5364 
5365         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
5366         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
5367         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
5368 
5369         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
5370         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
5371         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
5372 
5373         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
5374                       0);
5375 }
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root/net/core/rtnetlink.c

DEFINITIONS
