net/bridge/br_private.h

   1 /*
   2  *      Linux ethernet bridge
   3  *
   4  *      Authors:
   5  *      Lennert Buytenhek               <buytenh@gnu.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _BR_PRIVATE_H
  14 #define _BR_PRIVATE_H
  15
  16 #include <linux/netdevice.h>
  17 #include <linux/if_bridge.h>
  18 #include <linux/netpoll.h>
  19 #include <linux/u64_stats_sync.h>
  20 #include <net/route.h>
  21 #include <net/ip6_fib.h>
  22 #include <linux/if_vlan.h>
  23 #include <linux/rhashtable.h>
  24 #include <linux/refcount.h>
  25
  26 #define BR_HASH_BITS 8
  27 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  28
  29 #define BR_HOLD_TIME (1*HZ)
  30
  31 #define BR_PORT_BITS    10
  32 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  33
  34 #define BR_VERSION      "2.3"
  35
  36 /* Control of forwarding link local multicast */
  37 #define BR_GROUPFWD_DEFAULT     0
  38 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
  39 enum {
  40         BR_GROUPFWD_STP         = BIT(0),
  41         BR_GROUPFWD_MACPAUSE    = BIT(1),
  42         BR_GROUPFWD_LACP        = BIT(2),
  43 };
  44
  45 #define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \
  46                                 BR_GROUPFWD_LACP)
  47 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
  48 #define BR_GROUPFWD_8021AD      0xB801u
  49
  50 /* Path to usermode spanning tree program */
  51 #define BR_STP_PROG     "/sbin/bridge-stp"
  52
  53 typedef struct bridge_id bridge_id;
  54 typedef struct mac_addr mac_addr;
  55 typedef __u16 port_id;
  56
  57 struct bridge_id {
  58         unsigned char   prio[2];
  59         unsigned char   addr[ETH_ALEN];
  60 };
  61
  62 struct mac_addr {
  63         unsigned char   addr[ETH_ALEN];
  64 };
  65
  66 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  67 /* our own querier */
  68 struct bridge_mcast_own_query {
  69         struct timer_list       timer;
  70         u32                     startup_sent;
  71 };
  72
  73 /* other querier */
  74 struct bridge_mcast_other_query {
  75         struct timer_list               timer;
  76         unsigned long                   delay_time;
  77 };
  78
  79 /* selected querier */
  80 struct bridge_mcast_querier {
  81         struct br_ip addr;
  82         struct net_bridge_port __rcu    *port;
  83 };
  84
  85 /* IGMP/MLD statistics */
  86 struct bridge_mcast_stats {
  87         struct br_mcast_stats mstats;
  88         struct u64_stats_sync syncp;
  89 };
  90 #endif
  91
  92 struct br_vlan_stats {
  93         u64 rx_bytes;
  94         u64 rx_packets;
  95         u64 tx_bytes;
  96         u64 tx_packets;
  97         struct u64_stats_sync syncp;
  98 };
  99
 100 struct br_tunnel_info {
 101         __be64                  tunnel_id;
 102         struct metadata_dst     *tunnel_dst;
 103 };
 104
 105 /* private vlan flags */
 106 enum {
 107         BR_VLFLAG_PER_PORT_STATS = BIT(0),
 108 };
 109
 110 /**
 111  * struct net_bridge_vlan - per-vlan entry
 112  *
 113  * @vnode: rhashtable member
 114  * @vid: VLAN id
 115  * @flags: bridge vlan flags
 116  * @priv_flags: private (in-kernel) bridge vlan flags
 117  * @stats: per-cpu VLAN statistics
 118  * @br: if MASTER flag set, this points to a bridge struct
 119  * @port: if MASTER flag unset, this points to a port struct
 120  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
 121  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
 122  *          for this VLAN entry
 123  * @vlist: sorted list of VLAN entries
 124  * @rcu: used for entry destruction
 125  *
 126  * This structure is shared between the global per-VLAN entries contained in
 127  * the bridge rhashtable and the local per-port per-VLAN entries contained in
 128  * the port's rhashtable. The union entries should be interpreted depending on
 129  * the entry flags that are set.
 130  */
 131 struct net_bridge_vlan {
 132         struct rhash_head               vnode;
 133         struct rhash_head               tnode;
 134         u16                             vid;
 135         u16                             flags;
 136         u16                             priv_flags;
 137         struct br_vlan_stats __percpu   *stats;
 138         union {
 139                 struct net_bridge       *br;
 140                 struct net_bridge_port  *port;
 141         };
 142         union {
 143                 refcount_t              refcnt;
 144                 struct net_bridge_vlan  *brvlan;
 145         };
 146
 147         struct br_tunnel_info           tinfo;
 148
 149         struct list_head                vlist;
 150
 151         struct rcu_head                 rcu;
 152 };
 153
 154 /**
 155  * struct net_bridge_vlan_group
 156  *
 157  * @vlan_hash: VLAN entry rhashtable
 158  * @vlan_list: sorted VLAN entry list
 159  * @num_vlans: number of total VLAN entries
 160  * @pvid: PVID VLAN id
 161  *
 162  * IMPORTANT: Be careful when checking if there're VLAN entries using list
 163  *            primitives because the bridge can have entries in its list which
 164  *            are just for global context but not for filtering, i.e. they have
 165  *            the master flag set but not the brentry flag. If you have to check
 166  *            if there're "real" entries in the bridge please test @num_vlans
 167  */
 168 struct net_bridge_vlan_group {
 169         struct rhashtable               vlan_hash;
 170         struct rhashtable               tunnel_hash;
 171         struct list_head                vlan_list;
 172         u16                             num_vlans;
 173         u16                             pvid;
 174 };
 175
 176 struct net_bridge_fdb_key {
 177         mac_addr addr;
 178         u16 vlan_id;
 179 };
 180
 181 struct net_bridge_fdb_entry {
 182         struct rhash_head               rhnode;
 183         struct net_bridge_port          *dst;
 184
 185         struct net_bridge_fdb_key       key;
 186         struct hlist_node               fdb_node;
 187         unsigned char                   is_local:1,
 188                                         is_static:1,
 189                                         is_sticky:1,
 190                                         added_by_user:1,
 191                                         added_by_external_learn:1,
 192                                         offloaded:1;
 193
 194         /* write-heavy members should not affect lookups */
 195         unsigned long                   updated ____cacheline_aligned_in_smp;
 196         unsigned long                   used;
 197
 198         struct rcu_head                 rcu;
 199 };
 200
 201 #define MDB_PG_FLAGS_PERMANENT  BIT(0)
 202 #define MDB_PG_FLAGS_OFFLOAD    BIT(1)
 203
 204 struct net_bridge_port_group {
 205         struct net_bridge_port          *port;
 206         struct net_bridge_port_group __rcu *next;
 207         struct hlist_node               mglist;
 208         struct rcu_head                 rcu;
 209         struct timer_list               timer;
 210         struct br_ip                    addr;
 211         unsigned char                   flags;
 212         unsigned char                   eth_addr[ETH_ALEN];
 213 };
 214
 215 struct net_bridge_mdb_entry {
 216         struct hlist_node               hlist[2];
 217         struct net_bridge               *br;
 218         struct net_bridge_port_group __rcu *ports;
 219         struct rcu_head                 rcu;
 220         struct timer_list               timer;
 221         struct br_ip                    addr;
 222         bool                            host_joined;
 223 };
 224
 225 struct net_bridge_mdb_htable {
 226         struct hlist_head               *mhash;
 227         struct rcu_head                 rcu;
 228         struct net_bridge_mdb_htable    *old;
 229         u32                             size;
 230         u32                             max;
 231         u32                             secret;
 232         u32                             ver;
 233 };
 234
 235 struct net_bridge_port {
 236         struct net_bridge               *br;
 237         struct net_device               *dev;
 238         struct list_head                list;
 239
 240         unsigned long                   flags;
 241 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 242         struct net_bridge_vlan_group    __rcu *vlgrp;
 243 #endif
 244         struct net_bridge_port          __rcu *backup_port;
 245
 246         /* STP */
 247         u8                              priority;
 248         u8                              state;
 249         u16                             port_no;
 250         unsigned char                   topology_change_ack;
 251         unsigned char                   config_pending;
 252         port_id                         port_id;
 253         port_id                         designated_port;
 254         bridge_id                       designated_root;
 255         bridge_id                       designated_bridge;
 256         u32                             path_cost;
 257         u32                             designated_cost;
 258         unsigned long                   designated_age;
 259
 260         struct timer_list               forward_delay_timer;
 261         struct timer_list               hold_timer;
 262         struct timer_list               message_age_timer;
 263         struct kobject                  kobj;
 264         struct rcu_head                 rcu;
 265
 266 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 267         struct bridge_mcast_own_query   ip4_own_query;
 268 #if IS_ENABLED(CONFIG_IPV6)
 269         struct bridge_mcast_own_query   ip6_own_query;
 270 #endif /* IS_ENABLED(CONFIG_IPV6) */
 271         unsigned char                   multicast_router;
 272         struct bridge_mcast_stats       __percpu *mcast_stats;
 273         struct timer_list               multicast_router_timer;
 274         struct hlist_head               mglist;
 275         struct hlist_node               rlist;
 276 #endif
 277
 278 #ifdef CONFIG_SYSFS
 279         char                            sysfs_name[IFNAMSIZ];
 280 #endif
 281
 282 #ifdef CONFIG_NET_POLL_CONTROLLER
 283         struct netpoll                  *np;
 284 #endif
 285 #ifdef CONFIG_NET_SWITCHDEV
 286         int                             offload_fwd_mark;
 287 #endif
 288         u16                             group_fwd_mask;
 289         u16                             backup_redirected_cnt;
 290 };
 291
 292 #define kobj_to_brport(obj)     container_of(obj, struct net_bridge_port, kobj)
 293
 294 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 295 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 296
 297 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 298
 299 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 300 {
 301         return rcu_dereference(dev->rx_handler_data);
 302 }
 303
 304 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 305 {
 306         return br_port_exists(dev) ?
 307                 rtnl_dereference(dev->rx_handler_data) : NULL;
 308 }
 309
 310 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev)
 311 {
 312         return br_port_exists(dev) ?
 313                 rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
 314 }
 315
 316 enum net_bridge_opts {
 317         BROPT_VLAN_ENABLED,
 318         BROPT_VLAN_STATS_ENABLED,
 319         BROPT_NF_CALL_IPTABLES,
 320         BROPT_NF_CALL_IP6TABLES,
 321         BROPT_NF_CALL_ARPTABLES,
 322         BROPT_GROUP_ADDR_SET,
 323         BROPT_MULTICAST_ENABLED,
 324         BROPT_MULTICAST_QUERIER,
 325         BROPT_MULTICAST_QUERY_USE_IFADDR,
 326         BROPT_MULTICAST_STATS_ENABLED,
 327         BROPT_HAS_IPV6_ADDR,
 328         BROPT_NEIGH_SUPPRESS_ENABLED,
 329         BROPT_MTU_SET_BY_USER,
 330         BROPT_VLAN_STATS_PER_PORT,
 331 };
 332
 333 struct net_bridge {
 334         spinlock_t                      lock;
 335         spinlock_t                      hash_lock;
 336         struct list_head                port_list;
 337         struct net_device               *dev;
 338         struct pcpu_sw_netstats         __percpu *stats;
 339         unsigned long                   options;
 340         /* These fields are accessed on each packet */
 341 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 342         __be16                          vlan_proto;
 343         u16                             default_pvid;
 344         struct net_bridge_vlan_group    __rcu *vlgrp;
 345 #endif
 346
 347         struct rhashtable               fdb_hash_tbl;
 348 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 349         union {
 350                 struct rtable           fake_rtable;
 351                 struct rt6_info         fake_rt6_info;
 352         };
 353 #endif
 354         u16                             group_fwd_mask;
 355         u16                             group_fwd_mask_required;
 356
 357         /* STP */
 358         bridge_id                       designated_root;
 359         bridge_id                       bridge_id;
 360         unsigned char                   topology_change;
 361         unsigned char                   topology_change_detected;
 362         u16                             root_port;
 363         unsigned long                   max_age;
 364         unsigned long                   hello_time;
 365         unsigned long                   forward_delay;
 366         unsigned long                   ageing_time;
 367         unsigned long                   bridge_max_age;
 368         unsigned long                   bridge_hello_time;
 369         unsigned long                   bridge_forward_delay;
 370         unsigned long                   bridge_ageing_time;
 371         u32                             root_path_cost;
 372
 373         u8                              group_addr[ETH_ALEN];
 374
 375         enum {
 376                 BR_NO_STP,              /* no spanning tree */
 377                 BR_KERNEL_STP,          /* old STP in kernel */
 378                 BR_USER_STP,            /* new RSTP in userspace */
 379         } stp_enabled;
 380
 381 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 382
 383         u32                             hash_elasticity;
 384         u32                             hash_max;
 385
 386         u32                             multicast_last_member_count;
 387         u32                             multicast_startup_query_count;
 388
 389         u8                              multicast_igmp_version;
 390         u8                              multicast_router;
 391 #if IS_ENABLED(CONFIG_IPV6)
 392         u8                              multicast_mld_version;
 393 #endif
 394         spinlock_t                      multicast_lock;
 395         unsigned long                   multicast_last_member_interval;
 396         unsigned long                   multicast_membership_interval;
 397         unsigned long                   multicast_querier_interval;
 398         unsigned long                   multicast_query_interval;
 399         unsigned long                   multicast_query_response_interval;
 400         unsigned long                   multicast_startup_query_interval;
 401
 402         struct net_bridge_mdb_htable __rcu *mdb;
 403         struct hlist_head               router_list;
 404
 405         struct timer_list               multicast_router_timer;
 406         struct bridge_mcast_other_query ip4_other_query;
 407         struct bridge_mcast_own_query   ip4_own_query;
 408         struct bridge_mcast_querier     ip4_querier;
 409         struct bridge_mcast_stats       __percpu *mcast_stats;
 410 #if IS_ENABLED(CONFIG_IPV6)
 411         struct bridge_mcast_other_query ip6_other_query;
 412         struct bridge_mcast_own_query   ip6_own_query;
 413         struct bridge_mcast_querier     ip6_querier;
 414 #endif /* IS_ENABLED(CONFIG_IPV6) */
 415 #endif
 416
 417         struct timer_list               hello_timer;
 418         struct timer_list               tcn_timer;
 419         struct timer_list               topology_change_timer;
 420         struct delayed_work             gc_work;
 421         struct kobject                  *ifobj;
 422         u32                             auto_cnt;
 423
 424 #ifdef CONFIG_NET_SWITCHDEV
 425         int offload_fwd_mark;
 426 #endif
 427         struct hlist_head               fdb_list;
 428 };
 429
 430 struct br_input_skb_cb {
 431         struct net_device *brdev;
 432
 433 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 434         int igmp;
 435         int mrouters_only;
 436 #endif
 437
 438         bool proxyarp_replied;
 439         bool src_port_isolated;
 440
 441 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 442         bool vlan_filtered;
 443 #endif
 444
 445 #ifdef CONFIG_NET_SWITCHDEV
 446         int offload_fwd_mark;
 447 #endif
 448 };
 449
 450 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 451
 452 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 453 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 454 #else
 455 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 456 #endif
 457
 458 #define br_printk(level, br, format, args...)   \
 459         printk(level "%s: " format, (br)->dev->name, ##args)
 460
 461 #define br_err(__br, format, args...)                   \
 462         br_printk(KERN_ERR, __br, format, ##args)
 463 #define br_warn(__br, format, args...)                  \
 464         br_printk(KERN_WARNING, __br, format, ##args)
 465 #define br_notice(__br, format, args...)                \
 466         br_printk(KERN_NOTICE, __br, format, ##args)
 467 #define br_info(__br, format, args...)                  \
 468         br_printk(KERN_INFO, __br, format, ##args)
 469
 470 #define br_debug(br, format, args...)                   \
 471         pr_debug("%s: " format,  (br)->dev->name, ##args)
 472
 473 /* called under bridge lock */
 474 static inline int br_is_root_bridge(const struct net_bridge *br)
 475 {
 476         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 477 }
 478
 479 /* check if a VLAN entry is global */
 480 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 481 {
 482         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 483 }
 484
 485 /* check if a VLAN entry is used by the bridge */
 486 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 487 {
 488         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 489 }
 490
 491 /* check if we should use the vlan entry, returns false if it's only context */
 492 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 493 {
 494         if (br_vlan_is_master(v)) {
 495                 if (br_vlan_is_brentry(v))
 496                         return true;
 497                 else
 498                         return false;
 499         }
 500
 501         return true;
 502 }
 503
 504 static inline int br_opt_get(const struct net_bridge *br,
 505                              enum net_bridge_opts opt)
 506 {
 507         return test_bit(opt, &br->options);
 508 }
 509
 510 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on);
 511
 512 /* br_device.c */
 513 void br_dev_setup(struct net_device *dev);
 514 void br_dev_delete(struct net_device *dev, struct list_head *list);
 515 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 516 #ifdef CONFIG_NET_POLL_CONTROLLER
 517 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 518                                        struct sk_buff *skb)
 519 {
 520         struct netpoll *np = p->np;
 521
 522         if (np)
 523                 netpoll_send_skb(np, skb);
 524 }
 525
 526 int br_netpoll_enable(struct net_bridge_port *p);
 527 void br_netpoll_disable(struct net_bridge_port *p);
 528 #else
 529 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 530                                        struct sk_buff *skb)
 531 {
 532 }
 533
 534 static inline int br_netpoll_enable(struct net_bridge_port *p)
 535 {
 536         return 0;
 537 }
 538
 539 static inline void br_netpoll_disable(struct net_bridge_port *p)
 540 {
 541 }
 542 #endif
 543
 544 /* br_fdb.c */
 545 int br_fdb_init(void);
 546 void br_fdb_fini(void);
 547 int br_fdb_hash_init(struct net_bridge *br);
 548 void br_fdb_hash_fini(struct net_bridge *br);
 549 void br_fdb_flush(struct net_bridge *br);
 550 void br_fdb_find_delete_local(struct net_bridge *br,
 551                               const struct net_bridge_port *p,
 552                               const unsigned char *addr, u16 vid);
 553 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 554 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 555 void br_fdb_cleanup(struct work_struct *work);
 556 void br_fdb_delete_by_port(struct net_bridge *br,
 557                            const struct net_bridge_port *p, u16 vid, int do_all);
 558 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
 559                                              const unsigned char *addr,
 560                                              __u16 vid);
 561 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 562 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 563                    unsigned long off);
 564 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 565                   const unsigned char *addr, u16 vid);
 566 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 567                    const unsigned char *addr, u16 vid, bool added_by_user);
 568
 569 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 570                   struct net_device *dev, const unsigned char *addr, u16 vid);
 571 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 572                const unsigned char *addr, u16 vid, u16 nlh_flags);
 573 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 574                 struct net_device *dev, struct net_device *fdev, int *idx);
 575 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 576 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 577 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 578                               const unsigned char *addr, u16 vid,
 579                               bool swdev_notify);
 580 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 581                               const unsigned char *addr, u16 vid,
 582                               bool swdev_notify);
 583 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
 584                           const unsigned char *addr, u16 vid, bool offloaded);
 585
 586 /* br_forward.c */
 587 enum br_pkt_type {
 588         BR_PKT_UNICAST,
 589         BR_PKT_MULTICAST,
 590         BR_PKT_BROADCAST
 591 };
 592 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 593 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
 594                 bool local_rcv, bool local_orig);
 595 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 596 void br_flood(struct net_bridge *br, struct sk_buff *skb,
 597               enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
 598
 599 /* return true if both source port and dest port are isolated */
 600 static inline bool br_skb_isolated(const struct net_bridge_port *to,
 601                                    const struct sk_buff *skb)
 602 {
 603         return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
 604                (to->flags & BR_ISOLATED);
 605 }
 606
 607 /* br_if.c */
 608 void br_port_carrier_check(struct net_bridge_port *p, bool *notified);
 609 int br_add_bridge(struct net *net, const char *name);
 610 int br_del_bridge(struct net *net, const char *name);
 611 int br_add_if(struct net_bridge *br, struct net_device *dev,
 612               struct netlink_ext_ack *extack);
 613 int br_del_if(struct net_bridge *br, struct net_device *dev);
 614 void br_mtu_auto_adjust(struct net_bridge *br);
 615 netdev_features_t br_features_recompute(struct net_bridge *br,
 616                                         netdev_features_t features);
 617 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 618 void br_manage_promisc(struct net_bridge *br);
 619 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev);
 620
 621 /* br_input.c */
 622 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 623 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 624
 625 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 626 {
 627         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 628 }
 629
 630 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev)
 631 {
 632         return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame;
 633 }
 634
 635 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 636 {
 637         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 638 }
 639
 640 static inline struct net_bridge_port *
 641 br_port_get_check_rtnl(const struct net_device *dev)
 642 {
 643         return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL;
 644 }
 645
 646 /* br_ioctl.c */
 647 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 648 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 649                              void __user *arg);
 650
 651 /* br_multicast.c */
 652 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 653 extern unsigned int br_mdb_rehash_seq;
 654 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 655                      struct sk_buff *skb, u16 vid);
 656 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 657                                         struct sk_buff *skb, u16 vid);
 658 int br_multicast_add_port(struct net_bridge_port *port);
 659 void br_multicast_del_port(struct net_bridge_port *port);
 660 void br_multicast_enable_port(struct net_bridge_port *port);
 661 void br_multicast_disable_port(struct net_bridge_port *port);
 662 void br_multicast_init(struct net_bridge *br);
 663 void br_multicast_open(struct net_bridge *br);
 664 void br_multicast_stop(struct net_bridge *br);
 665 void br_multicast_dev_del(struct net_bridge *br);
 666 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 667                         struct sk_buff *skb, bool local_rcv, bool local_orig);
 668 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 669 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 670 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 671 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 672 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 673 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
 674 #if IS_ENABLED(CONFIG_IPV6)
 675 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
 676 #endif
 677 struct net_bridge_mdb_entry *
 678 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 679 struct net_bridge_mdb_entry *
 680 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 681                        struct br_ip *group);
 682 void br_multicast_free_pg(struct rcu_head *head);
 683 struct net_bridge_port_group *
 684 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 685                             struct net_bridge_port_group __rcu *next,
 686                             unsigned char flags, const unsigned char *src);
 687 void br_mdb_init(void);
 688 void br_mdb_uninit(void);
 689 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 690                    struct br_ip *group, int type, u8 flags);
 691 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 692                    int type);
 693 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
 694                         const struct sk_buff *skb, u8 type, u8 dir);
 695 int br_multicast_init_stats(struct net_bridge *br);
 696 void br_multicast_uninit_stats(struct net_bridge *br);
 697 void br_multicast_get_stats(const struct net_bridge *br,
 698                             const struct net_bridge_port *p,
 699                             struct br_mcast_stats *dest);
 700
 701 #define mlock_dereference(X, br) \
 702         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 703
 704 static inline bool br_multicast_is_router(struct net_bridge *br)
 705 {
 706         return br->multicast_router == 2 ||
 707                (br->multicast_router == 1 &&
 708                 timer_pending(&br->multicast_router_timer));
 709 }
 710
 711 static inline bool
 712 __br_multicast_querier_exists(struct net_bridge *br,
 713                                 struct bridge_mcast_other_query *querier,
 714                                 const bool is_ipv6)
 715 {
 716         bool own_querier_enabled;
 717
 718         if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
 719                 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR))
 720                         own_querier_enabled = false;
 721                 else
 722                         own_querier_enabled = true;
 723         } else {
 724                 own_querier_enabled = false;
 725         }
 726
 727         return time_is_before_jiffies(querier->delay_time) &&
 728                (own_querier_enabled || timer_pending(&querier->timer));
 729 }
 730
 731 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 732                                                struct ethhdr *eth)
 733 {
 734         switch (eth->h_proto) {
 735         case (htons(ETH_P_IP)):
 736                 return __br_multicast_querier_exists(br,
 737                         &br->ip4_other_query, false);
 738 #if IS_ENABLED(CONFIG_IPV6)
 739         case (htons(ETH_P_IPV6)):
 740                 return __br_multicast_querier_exists(br,
 741                         &br->ip6_other_query, true);
 742 #endif
 743         default:
 744                 return false;
 745         }
 746 }
 747
 748 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 749 {
 750         return BR_INPUT_SKB_CB(skb)->igmp;
 751 }
 752 #else
 753 static inline int br_multicast_rcv(struct net_bridge *br,
 754                                    struct net_bridge_port *port,
 755                                    struct sk_buff *skb,
 756                                    u16 vid)
 757 {
 758         return 0;
 759 }
 760
 761 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 762                                                       struct sk_buff *skb, u16 vid)
 763 {
 764         return NULL;
 765 }
 766
 767 static inline int br_multicast_add_port(struct net_bridge_port *port)
 768 {
 769         return 0;
 770 }
 771
 772 static inline void br_multicast_del_port(struct net_bridge_port *port)
 773 {
 774 }
 775
 776 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 777 {
 778 }
 779
 780 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 781 {
 782 }
 783
 784 static inline void br_multicast_init(struct net_bridge *br)
 785 {
 786 }
 787
 788 static inline void br_multicast_open(struct net_bridge *br)
 789 {
 790 }
 791
 792 static inline void br_multicast_stop(struct net_bridge *br)
 793 {
 794 }
 795
 796 static inline void br_multicast_dev_del(struct net_bridge *br)
 797 {
 798 }
 799
 800 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 801                                       struct sk_buff *skb,
 802                                       bool local_rcv, bool local_orig)
 803 {
 804 }
 805
 806 static inline bool br_multicast_is_router(struct net_bridge *br)
 807 {
 808         return false;
 809 }
 810
 811 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 812                                                struct ethhdr *eth)
 813 {
 814         return false;
 815 }
 816
 817 static inline void br_mdb_init(void)
 818 {
 819 }
 820
 821 static inline void br_mdb_uninit(void)
 822 {
 823 }
 824
 825 static inline void br_multicast_count(struct net_bridge *br,
 826                                       const struct net_bridge_port *p,
 827                                       const struct sk_buff *skb,
 828                                       u8 type, u8 dir)
 829 {
 830 }
 831
 832 static inline int br_multicast_init_stats(struct net_bridge *br)
 833 {
 834         return 0;
 835 }
 836
 837 static inline void br_multicast_uninit_stats(struct net_bridge *br)
 838 {
 839 }
 840
 841 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 842 {
 843         return 0;
 844 }
 845 #endif
 846
 847 /* br_vlan.c */
 848 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 849 bool br_allowed_ingress(const struct net_bridge *br,
 850                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 851                         u16 *vid);
 852 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 853                        const struct sk_buff *skb);
 854 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 855 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 856                                const struct net_bridge_port *port,
 857                                struct net_bridge_vlan_group *vg,
 858                                struct sk_buff *skb);
 859 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
 860                 bool *changed);
 861 int br_vlan_delete(struct net_bridge *br, u16 vid);
 862 void br_vlan_flush(struct net_bridge *br);
 863 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 864 void br_recalculate_fwd_mask(struct net_bridge *br);
 865 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 866 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 867 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 868 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 869 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
 870 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val);
 871 int br_vlan_init(struct net_bridge *br);
 872 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 873 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
 874 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
 875                  bool *changed);
 876 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 877 void nbp_vlan_flush(struct net_bridge_port *port);
 878 int nbp_vlan_init(struct net_bridge_port *port);
 879 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 880 void br_vlan_get_stats(const struct net_bridge_vlan *v,
 881                        struct br_vlan_stats *stats);
 882
 883 static inline struct net_bridge_vlan_group *br_vlan_group(
 884                                         const struct net_bridge *br)
 885 {
 886         return rtnl_dereference(br->vlgrp);
 887 }
 888
 889 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 890                                         const struct net_bridge_port *p)
 891 {
 892         return rtnl_dereference(p->vlgrp);
 893 }
 894
 895 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 896                                         const struct net_bridge *br)
 897 {
 898         return rcu_dereference(br->vlgrp);
 899 }
 900
 901 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 902                                         const struct net_bridge_port *p)
 903 {
 904         return rcu_dereference(p->vlgrp);
 905 }
 906
 907 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 908  * skb, the vlan tag will always be present if the frame was tagged.
 909  */
 910 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 911 {
 912         int err = 0;
 913
 914         if (skb_vlan_tag_present(skb)) {
 915                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 916         } else {
 917                 *vid = 0;
 918                 err = -EINVAL;
 919         }
 920
 921         return err;
 922 }
 923
 924 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 925 {
 926         if (!vg)
 927                 return 0;
 928
 929         smp_rmb();
 930         return vg->pvid;
 931 }
 932
 933 #else
 934 static inline bool br_allowed_ingress(const struct net_bridge *br,
 935                                       struct net_bridge_vlan_group *vg,
 936                                       struct sk_buff *skb,
 937                                       u16 *vid)
 938 {
 939         return true;
 940 }
 941
 942 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 943                                      const struct sk_buff *skb)
 944 {
 945         return true;
 946 }
 947
 948 static inline bool br_should_learn(struct net_bridge_port *p,
 949                                    struct sk_buff *skb, u16 *vid)
 950 {
 951         return true;
 952 }
 953
 954 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 955                                              const struct net_bridge_port *port,
 956                                              struct net_bridge_vlan_group *vg,
 957                                              struct sk_buff *skb)
 958 {
 959         return skb;
 960 }
 961
 962 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
 963                               bool *changed)
 964 {
 965         *changed = false;
 966         return -EOPNOTSUPP;
 967 }
 968
 969 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 970 {
 971         return -EOPNOTSUPP;
 972 }
 973
 974 static inline void br_vlan_flush(struct net_bridge *br)
 975 {
 976 }
 977
 978 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 979 {
 980 }
 981
 982 static inline int br_vlan_init(struct net_bridge *br)
 983 {
 984         return 0;
 985 }
 986
 987 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
 988                                bool *changed)
 989 {
 990         *changed = false;
 991         return -EOPNOTSUPP;
 992 }
 993
 994 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 995 {
 996         return -EOPNOTSUPP;
 997 }
 998
 999 static inline void nbp_vlan_flush(struct net_bridge_port *port)
1000 {
1001 }
1002
1003 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
1004                                                    u16 vid)
1005 {
1006         return NULL;
1007 }
1008
1009 static inline int nbp_vlan_init(struct net_bridge_port *port)
1010 {
1011         return 0;
1012 }
1013
1014 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
1015 {
1016         return 0;
1017 }
1018
1019 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1020 {
1021         return 0;
1022 }
1023
1024 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
1025                                           unsigned long val)
1026 {
1027         return -EOPNOTSUPP;
1028 }
1029
1030 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
1031                                          u32 filter_mask)
1032 {
1033         return 0;
1034 }
1035
1036 static inline struct net_bridge_vlan_group *br_vlan_group(
1037                                         const struct net_bridge *br)
1038 {
1039         return NULL;
1040 }
1041
1042 static inline struct net_bridge_vlan_group *nbp_vlan_group(
1043                                         const struct net_bridge_port *p)
1044 {
1045         return NULL;
1046 }
1047
1048 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1049                                         const struct net_bridge *br)
1050 {
1051         return NULL;
1052 }
1053
1054 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1055                                         const struct net_bridge_port *p)
1056 {
1057         return NULL;
1058 }
1059
1060 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
1061                                      struct br_vlan_stats *stats)
1062 {
1063 }
1064 #endif
1065
1066 struct nf_br_ops {
1067         int (*br_dev_xmit_hook)(struct sk_buff *skb);
1068 };
1069 extern const struct nf_br_ops __rcu *nf_br_ops;
1070
1071 /* br_netfilter.c */
1072 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1073 int br_nf_core_init(void);
1074 void br_nf_core_fini(void);
1075 void br_netfilter_rtable_init(struct net_bridge *);
1076 #else
1077 static inline int br_nf_core_init(void) { return 0; }
1078 static inline void br_nf_core_fini(void) {}
1079 #define br_netfilter_rtable_init(x)
1080 #endif
1081
1082 /* br_stp.c */
1083 void br_set_state(struct net_bridge_port *p, unsigned int state);
1084 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1085 void br_init_port(struct net_bridge_port *p);
1086 void br_become_designated_port(struct net_bridge_port *p);
1087
1088 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1089 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1090 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1091 int br_set_max_age(struct net_bridge *br, unsigned long x);
1092 int __set_ageing_time(struct net_device *dev, unsigned long t);
1093 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1094
1095
1096 /* br_stp_if.c */
1097 void br_stp_enable_bridge(struct net_bridge *br);
1098 void br_stp_disable_bridge(struct net_bridge *br);
1099 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
1100 void br_stp_enable_port(struct net_bridge_port *p);
1101 void br_stp_disable_port(struct net_bridge_port *p);
1102 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1103 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1104 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1105 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1106 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1107 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1108
1109 /* br_stp_bpdu.c */
1110 struct stp_proto;
1111 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1112                 struct net_device *dev);
1113
1114 /* br_stp_timer.c */
1115 void br_stp_timer_init(struct net_bridge *br);
1116 void br_stp_port_timer_init(struct net_bridge_port *p);
1117 unsigned long br_timer_value(const struct timer_list *timer);
1118
1119 /* br.c */
1120 #if IS_ENABLED(CONFIG_ATM_LANE)
1121 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1122 #endif
1123
1124 /* br_netlink.c */
1125 extern struct rtnl_link_ops br_link_ops;
1126 int br_netlink_init(void);
1127 void br_netlink_fini(void);
1128 void br_ifinfo_notify(int event, const struct net_bridge *br,
1129                       const struct net_bridge_port *port);
1130 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1131 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1132 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1133                u32 filter_mask, int nlflags);
1134
1135 #ifdef CONFIG_SYSFS
1136 /* br_sysfs_if.c */
1137 extern const struct sysfs_ops brport_sysfs_ops;
1138 int br_sysfs_addif(struct net_bridge_port *p);
1139 int br_sysfs_renameif(struct net_bridge_port *p);
1140
1141 /* br_sysfs_br.c */
1142 int br_sysfs_addbr(struct net_device *dev);
1143 void br_sysfs_delbr(struct net_device *dev);
1144
1145 #else
1146
1147 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1148 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1149 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1150 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1151 #endif /* CONFIG_SYSFS */
1152
1153 /* br_switchdev.c */
1154 #ifdef CONFIG_NET_SWITCHDEV
1155 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1156 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1157                               struct sk_buff *skb);
1158 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1159                                   const struct sk_buff *skb);
1160 int br_switchdev_set_port_flag(struct net_bridge_port *p,
1161                                unsigned long flags,
1162                                unsigned long mask);
1163 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
1164                              int type);
1165 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags);
1166 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
1167
1168 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1169 {
1170         skb->offload_fwd_mark = 0;
1171 }
1172 #else
1173 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1174 {
1175         return 0;
1176 }
1177
1178 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1179                                             struct sk_buff *skb)
1180 {
1181 }
1182
1183 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1184                                                 const struct sk_buff *skb)
1185 {
1186         return true;
1187 }
1188
1189 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1190                                              unsigned long flags,
1191                                              unsigned long mask)
1192 {
1193         return 0;
1194 }
1195
1196 static inline int br_switchdev_port_vlan_add(struct net_device *dev,
1197                                              u16 vid, u16 flags)
1198 {
1199         return -EOPNOTSUPP;
1200 }
1201
1202 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
1203 {
1204         return -EOPNOTSUPP;
1205 }
1206
1207 static inline void
1208 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
1209 {
1210 }
1211
1212 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1213 {
1214 }
1215 #endif /* CONFIG_NET_SWITCHDEV */
1216
1217 /* br_arp_nd_proxy.c */
1218 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br);
1219 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
1220                               u16 vid, struct net_bridge_port *p);
1221 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
1222                        u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
1223 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);
1224 #endif