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 <linux/if_vlan.h>
  22
  23 #define BR_HASH_BITS 8
  24 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  25
  26 #define BR_HOLD_TIME (1*HZ)
  27
  28 #define BR_PORT_BITS    10
  29 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  30 #define BR_VLAN_BITMAP_LEN      BITS_TO_LONGS(VLAN_N_VID)
  31
  32 #define BR_VERSION      "2.3"
  33
  34 /* Control of forwarding link local multicast */
  35 #define BR_GROUPFWD_DEFAULT     0
  36 /* Don't allow forwarding control protocols like STP and LLDP */
  37 #define BR_GROUPFWD_RESTRICTED  0x4007u
  38
  39 /* Path to usermode spanning tree program */
  40 #define BR_STP_PROG     "/sbin/bridge-stp"
  41
  42 typedef struct bridge_id bridge_id;
  43 typedef struct mac_addr mac_addr;
  44 typedef __u16 port_id;
  45
  46 struct bridge_id
  47 {
  48         unsigned char   prio[2];
  49         unsigned char   addr[6];
  50 };
  51
  52 struct mac_addr
  53 {
  54         unsigned char   addr[6];
  55 };
  56
  57 struct br_ip
  58 {
  59         union {
  60                 __be32  ip4;
  61 #if IS_ENABLED(CONFIG_IPV6)
  62                 struct in6_addr ip6;
  63 #endif
  64         } u;
  65         __be16          proto;
  66         __u16           vid;
  67 };
  68
  69 struct net_port_vlans {
  70         u16                             port_idx;
  71         u16                             pvid;
  72         union {
  73                 struct net_bridge_port          *port;
  74                 struct net_bridge               *br;
  75         }                               parent;
  76         struct rcu_head                 rcu;
  77         unsigned long                   vlan_bitmap[BR_VLAN_BITMAP_LEN];
  78         unsigned long                   untagged_bitmap[BR_VLAN_BITMAP_LEN];
  79         u16                             num_vlans;
  80 };
  81
  82 struct net_bridge_fdb_entry
  83 {
  84         struct hlist_node               hlist;
  85         struct net_bridge_port          *dst;
  86
  87         struct rcu_head                 rcu;
  88         unsigned long                   updated;
  89         unsigned long                   used;
  90         mac_addr                        addr;
  91         unsigned char                   is_local;
  92         unsigned char                   is_static;
  93         __u16                           vlan_id;
  94 };
  95
  96 struct net_bridge_port_group {
  97         struct net_bridge_port          *port;
  98         struct net_bridge_port_group __rcu *next;
  99         struct hlist_node               mglist;
 100         struct rcu_head                 rcu;
 101         struct timer_list               timer;
 102         struct br_ip                    addr;
 103         unsigned char                   state;
 104 };
 105
 106 struct net_bridge_mdb_entry
 107 {
 108         struct hlist_node               hlist[2];
 109         struct net_bridge               *br;
 110         struct net_bridge_port_group __rcu *ports;
 111         struct rcu_head                 rcu;
 112         struct timer_list               timer;
 113         struct br_ip                    addr;
 114         bool                            mglist;
 115 };
 116
 117 struct net_bridge_mdb_htable
 118 {
 119         struct hlist_head               *mhash;
 120         struct rcu_head                 rcu;
 121         struct net_bridge_mdb_htable    *old;
 122         u32                             size;
 123         u32                             max;
 124         u32                             secret;
 125         u32                             ver;
 126 };
 127
 128 struct net_bridge_port
 129 {
 130         struct net_bridge               *br;
 131         struct net_device               *dev;
 132         struct list_head                list;
 133
 134         /* STP */
 135         u8                              priority;
 136         u8                              state;
 137         u16                             port_no;
 138         unsigned char                   topology_change_ack;
 139         unsigned char                   config_pending;
 140         port_id                         port_id;
 141         port_id                         designated_port;
 142         bridge_id                       designated_root;
 143         bridge_id                       designated_bridge;
 144         u32                             path_cost;
 145         u32                             designated_cost;
 146         unsigned long                   designated_age;
 147
 148         struct timer_list               forward_delay_timer;
 149         struct timer_list               hold_timer;
 150         struct timer_list               message_age_timer;
 151         struct kobject                  kobj;
 152         struct rcu_head                 rcu;
 153
 154         unsigned long                   flags;
 155 #define BR_HAIRPIN_MODE         0x00000001
 156 #define BR_BPDU_GUARD           0x00000002
 157 #define BR_ROOT_BLOCK           0x00000004
 158 #define BR_MULTICAST_FAST_LEAVE 0x00000008
 159 #define BR_ADMIN_COST           0x00000010
 160
 161 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 162         u32                             multicast_startup_queries_sent;
 163         unsigned char                   multicast_router;
 164         struct timer_list               multicast_router_timer;
 165         struct timer_list               multicast_query_timer;
 166         struct hlist_head               mglist;
 167         struct hlist_node               rlist;
 168 #endif
 169
 170 #ifdef CONFIG_SYSFS
 171         char                            sysfs_name[IFNAMSIZ];
 172 #endif
 173
 174 #ifdef CONFIG_NET_POLL_CONTROLLER
 175         struct netpoll                  *np;
 176 #endif
 177 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 178         struct net_port_vlans __rcu     *vlan_info;
 179 #endif
 180 };
 181
 182 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 183
 184 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 185 {
 186         struct net_bridge_port *port =
 187                         rcu_dereference_rtnl(dev->rx_handler_data);
 188
 189         return br_port_exists(dev) ? port : NULL;
 190 }
 191
 192 static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev)
 193 {
 194         return br_port_exists(dev) ?
 195                 rtnl_dereference(dev->rx_handler_data) : NULL;
 196 }
 197
 198 struct br_cpu_netstats {
 199         u64                     rx_packets;
 200         u64                     rx_bytes;
 201         u64                     tx_packets;
 202         u64                     tx_bytes;
 203         struct u64_stats_sync   syncp;
 204 };
 205
 206 struct net_bridge
 207 {
 208         spinlock_t                      lock;
 209         struct list_head                port_list;
 210         struct net_device               *dev;
 211
 212         struct br_cpu_netstats __percpu *stats;
 213         spinlock_t                      hash_lock;
 214         struct hlist_head               hash[BR_HASH_SIZE];
 215 #ifdef CONFIG_BRIDGE_NETFILTER
 216         struct rtable                   fake_rtable;
 217         bool                            nf_call_iptables;
 218         bool                            nf_call_ip6tables;
 219         bool                            nf_call_arptables;
 220 #endif
 221         u16                             group_fwd_mask;
 222
 223         /* STP */
 224         bridge_id                       designated_root;
 225         bridge_id                       bridge_id;
 226         u32                             root_path_cost;
 227         unsigned long                   max_age;
 228         unsigned long                   hello_time;
 229         unsigned long                   forward_delay;
 230         unsigned long                   bridge_max_age;
 231         unsigned long                   ageing_time;
 232         unsigned long                   bridge_hello_time;
 233         unsigned long                   bridge_forward_delay;
 234
 235         u8                              group_addr[ETH_ALEN];
 236         u16                             root_port;
 237
 238         enum {
 239                 BR_NO_STP,              /* no spanning tree */
 240                 BR_KERNEL_STP,          /* old STP in kernel */
 241                 BR_USER_STP,            /* new RSTP in userspace */
 242         } stp_enabled;
 243
 244         unsigned char                   topology_change;
 245         unsigned char                   topology_change_detected;
 246
 247 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 248         unsigned char                   multicast_router;
 249
 250         u8                              multicast_disabled:1;
 251         u8                              multicast_querier:1;
 252
 253         u32                             hash_elasticity;
 254         u32                             hash_max;
 255
 256         u32                             multicast_last_member_count;
 257         u32                             multicast_startup_queries_sent;
 258         u32                             multicast_startup_query_count;
 259
 260         unsigned long                   multicast_last_member_interval;
 261         unsigned long                   multicast_membership_interval;
 262         unsigned long                   multicast_querier_interval;
 263         unsigned long                   multicast_query_interval;
 264         unsigned long                   multicast_query_response_interval;
 265         unsigned long                   multicast_startup_query_interval;
 266
 267         spinlock_t                      multicast_lock;
 268         struct net_bridge_mdb_htable __rcu *mdb;
 269         struct hlist_head               router_list;
 270
 271         struct timer_list               multicast_router_timer;
 272         struct timer_list               multicast_querier_timer;
 273         struct timer_list               multicast_query_timer;
 274 #endif
 275
 276         struct timer_list               hello_timer;
 277         struct timer_list               tcn_timer;
 278         struct timer_list               topology_change_timer;
 279         struct timer_list               gc_timer;
 280         struct kobject                  *ifobj;
 281 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 282         u8                              vlan_enabled;
 283         struct net_port_vlans __rcu     *vlan_info;
 284 #endif
 285 };
 286
 287 struct br_input_skb_cb {
 288         struct net_device *brdev;
 289 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 290         int igmp;
 291         int mrouters_only;
 292 #endif
 293 };
 294
 295 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 296
 297 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 298 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 299 #else
 300 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 301 #endif
 302
 303 #define br_printk(level, br, format, args...)   \
 304         printk(level "%s: " format, (br)->dev->name, ##args)
 305
 306 #define br_err(__br, format, args...)                   \
 307         br_printk(KERN_ERR, __br, format, ##args)
 308 #define br_warn(__br, format, args...)                  \
 309         br_printk(KERN_WARNING, __br, format, ##args)
 310 #define br_notice(__br, format, args...)                \
 311         br_printk(KERN_NOTICE, __br, format, ##args)
 312 #define br_info(__br, format, args...)                  \
 313         br_printk(KERN_INFO, __br, format, ##args)
 314
 315 #define br_debug(br, format, args...)                   \
 316         pr_debug("%s: " format,  (br)->dev->name, ##args)
 317
 318 extern struct notifier_block br_device_notifier;
 319
 320 /* called under bridge lock */
 321 static inline int br_is_root_bridge(const struct net_bridge *br)
 322 {
 323         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 324 }
 325
 326 /* br_device.c */
 327 extern void br_dev_setup(struct net_device *dev);
 328 extern void br_dev_delete(struct net_device *dev, struct list_head *list);
 329 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
 330                                struct net_device *dev);
 331 #ifdef CONFIG_NET_POLL_CONTROLLER
 332 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
 333 {
 334         return br->dev->npinfo;
 335 }
 336
 337 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 338                                        struct sk_buff *skb)
 339 {
 340         struct netpoll *np = p->np;
 341
 342         if (np)
 343                 netpoll_send_skb(np, skb);
 344 }
 345
 346 extern int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp);
 347 extern void br_netpoll_disable(struct net_bridge_port *p);
 348 #else
 349 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
 350 {
 351         return NULL;
 352 }
 353
 354 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 355                                        struct sk_buff *skb)
 356 {
 357 }
 358
 359 static inline int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 360 {
 361         return 0;
 362 }
 363
 364 static inline void br_netpoll_disable(struct net_bridge_port *p)
 365 {
 366 }
 367 #endif
 368
 369 /* br_fdb.c */
 370 extern int br_fdb_init(void);
 371 extern void br_fdb_fini(void);
 372 extern void br_fdb_flush(struct net_bridge *br);
 373 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 374                               const unsigned char *newaddr);
 375 extern void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 376 extern void br_fdb_cleanup(unsigned long arg);
 377 extern void br_fdb_delete_by_port(struct net_bridge *br,
 378                                   const struct net_bridge_port *p, int do_all);
 379 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 380                                                  const unsigned char *addr,
 381                                                  __u16 vid);
 382 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 383 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 384                           unsigned long count, unsigned long off);
 385 extern int br_fdb_insert(struct net_bridge *br,
 386                          struct net_bridge_port *source,
 387                          const unsigned char *addr,
 388                          u16 vid);
 389 extern void br_fdb_update(struct net_bridge *br,
 390                           struct net_bridge_port *source,
 391                           const unsigned char *addr,
 392                           u16 vid);
 393 extern int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, u16 vid);
 394
 395 extern int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 396                          struct net_device *dev,
 397                          const unsigned char *addr);
 398 extern int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[],
 399                       struct net_device *dev,
 400                       const unsigned char *addr,
 401                       u16 nlh_flags);
 402 extern int br_fdb_dump(struct sk_buff *skb,
 403                        struct netlink_callback *cb,
 404                        struct net_device *dev,
 405                        int idx);
 406
 407 /* br_forward.c */
 408 extern void br_deliver(const struct net_bridge_port *to,
 409                 struct sk_buff *skb);
 410 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 411 extern void br_forward(const struct net_bridge_port *to,
 412                 struct sk_buff *skb, struct sk_buff *skb0);
 413 extern int br_forward_finish(struct sk_buff *skb);
 414 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
 415 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 416                              struct sk_buff *skb2);
 417
 418 /* br_if.c */
 419 extern void br_port_carrier_check(struct net_bridge_port *p);
 420 extern int br_add_bridge(struct net *net, const char *name);
 421 extern int br_del_bridge(struct net *net, const char *name);
 422 extern void br_net_exit(struct net *net);
 423 extern int br_add_if(struct net_bridge *br,
 424               struct net_device *dev);
 425 extern int br_del_if(struct net_bridge *br,
 426               struct net_device *dev);
 427 extern int br_min_mtu(const struct net_bridge *br);
 428 extern netdev_features_t br_features_recompute(struct net_bridge *br,
 429         netdev_features_t features);
 430
 431 /* br_input.c */
 432 extern int br_handle_frame_finish(struct sk_buff *skb);
 433 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 434
 435 /* br_ioctl.c */
 436 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 437 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
 438
 439 /* br_multicast.c */
 440 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 441 extern unsigned int br_mdb_rehash_seq;
 442 extern int br_multicast_rcv(struct net_bridge *br,
 443                             struct net_bridge_port *port,
 444                             struct sk_buff *skb);
 445 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 446                                                struct sk_buff *skb, u16 vid);
 447 extern void br_multicast_add_port(struct net_bridge_port *port);
 448 extern void br_multicast_del_port(struct net_bridge_port *port);
 449 extern void br_multicast_enable_port(struct net_bridge_port *port);
 450 extern void br_multicast_disable_port(struct net_bridge_port *port);
 451 extern void br_multicast_init(struct net_bridge *br);
 452 extern void br_multicast_open(struct net_bridge *br);
 453 extern void br_multicast_stop(struct net_bridge *br);
 454 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 455                                  struct sk_buff *skb);
 456 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 457                                  struct sk_buff *skb, struct sk_buff *skb2);
 458 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 459 extern int br_multicast_set_port_router(struct net_bridge_port *p,
 460                                         unsigned long val);
 461 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 462 extern int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 463 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 464 extern struct net_bridge_mdb_entry *br_mdb_ip_get(
 465                                 struct net_bridge_mdb_htable *mdb,
 466                                 struct br_ip *dst);
 467 extern struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 468                                 struct net_bridge_port *port, struct br_ip *group);
 469 extern void br_multicast_free_pg(struct rcu_head *head);
 470 extern struct net_bridge_port_group *br_multicast_new_port_group(
 471                                 struct net_bridge_port *port,
 472                                 struct br_ip *group,
 473                                 struct net_bridge_port_group *next,
 474                                 unsigned char state);
 475 extern void br_mdb_init(void);
 476 extern void br_mdb_uninit(void);
 477 extern void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 478                           struct br_ip *group, int type);
 479
 480 #define mlock_dereference(X, br) \
 481         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 482
 483 #if IS_ENABLED(CONFIG_IPV6)
 484 #include <net/addrconf.h>
 485 static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
 486 {
 487         if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
 488                 return 1;
 489         return 0;
 490 }
 491 #endif
 492
 493 static inline bool br_multicast_is_router(struct net_bridge *br)
 494 {
 495         return br->multicast_router == 2 ||
 496                (br->multicast_router == 1 &&
 497                 timer_pending(&br->multicast_router_timer));
 498 }
 499 #else
 500 static inline int br_multicast_rcv(struct net_bridge *br,
 501                                    struct net_bridge_port *port,
 502                                    struct sk_buff *skb)
 503 {
 504         return 0;
 505 }
 506
 507 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 508                                                       struct sk_buff *skb, u16 vid)
 509 {
 510         return NULL;
 511 }
 512
 513 static inline void br_multicast_add_port(struct net_bridge_port *port)
 514 {
 515 }
 516
 517 static inline void br_multicast_del_port(struct net_bridge_port *port)
 518 {
 519 }
 520
 521 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 522 {
 523 }
 524
 525 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 526 {
 527 }
 528
 529 static inline void br_multicast_init(struct net_bridge *br)
 530 {
 531 }
 532
 533 static inline void br_multicast_open(struct net_bridge *br)
 534 {
 535 }
 536
 537 static inline void br_multicast_stop(struct net_bridge *br)
 538 {
 539 }
 540
 541 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 542                                         struct sk_buff *skb)
 543 {
 544 }
 545
 546 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 547                                         struct sk_buff *skb,
 548                                         struct sk_buff *skb2)
 549 {
 550 }
 551 static inline bool br_multicast_is_router(struct net_bridge *br)
 552 {
 553         return 0;
 554 }
 555 static inline void br_mdb_init(void)
 556 {
 557 }
 558 static inline void br_mdb_uninit(void)
 559 {
 560 }
 561 #endif
 562
 563 /* br_vlan.c */
 564 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 565 extern bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 566                                struct sk_buff *skb, u16 *vid);
 567 extern bool br_allowed_egress(struct net_bridge *br,
 568                               const struct net_port_vlans *v,
 569                               const struct sk_buff *skb);
 570 extern struct sk_buff *br_handle_vlan(struct net_bridge *br,
 571                                       const struct net_port_vlans *v,
 572                                       struct sk_buff *skb);
 573 extern int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 574 extern int br_vlan_delete(struct net_bridge *br, u16 vid);
 575 extern void br_vlan_flush(struct net_bridge *br);
 576 extern int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 577 extern int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 578 extern int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 579 extern void nbp_vlan_flush(struct net_bridge_port *port);
 580 extern bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 581
 582 static inline struct net_port_vlans *br_get_vlan_info(
 583                                                 const struct net_bridge *br)
 584 {
 585         return rcu_dereference_rtnl(br->vlan_info);
 586 }
 587
 588 static inline struct net_port_vlans *nbp_get_vlan_info(
 589                                                 const struct net_bridge_port *p)
 590 {
 591         return rcu_dereference_rtnl(p->vlan_info);
 592 }
 593
 594 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 595  * skb, the vlan tag will always be present if the frame was tagged.
 596  */
 597 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 598 {
 599         int err = 0;
 600
 601         if (vlan_tx_tag_present(skb))
 602                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 603         else {
 604                 *vid = 0;
 605                 err = -EINVAL;
 606         }
 607
 608         return err;
 609 }
 610
 611 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 612 {
 613         /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
 614          * vid wasn't set
 615          */
 616         smp_rmb();
 617         return (v->pvid & VLAN_TAG_PRESENT) ?
 618                         (v->pvid & ~VLAN_TAG_PRESENT) :
 619                         VLAN_N_VID;
 620 }
 621
 622 #else
 623 static inline bool br_allowed_ingress(struct net_bridge *br,
 624                                       struct net_port_vlans *v,
 625                                       struct sk_buff *skb,
 626                                       u16 *vid)
 627 {
 628         return true;
 629 }
 630
 631 static inline bool br_allowed_egress(struct net_bridge *br,
 632                                      const struct net_port_vlans *v,
 633                                      const struct sk_buff *skb)
 634 {
 635         return true;
 636 }
 637
 638 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 639                                              const struct net_port_vlans *v,
 640                                              struct sk_buff *skb)
 641 {
 642         return skb;
 643 }
 644
 645 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 646 {
 647         return -EOPNOTSUPP;
 648 }
 649
 650 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 651 {
 652         return -EOPNOTSUPP;
 653 }
 654
 655 static inline void br_vlan_flush(struct net_bridge *br)
 656 {
 657 }
 658
 659 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 660 {
 661         return -EOPNOTSUPP;
 662 }
 663
 664 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 665 {
 666         return -EOPNOTSUPP;
 667 }
 668
 669 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 670 {
 671 }
 672
 673 static inline struct net_port_vlans *br_get_vlan_info(
 674                                                 const struct net_bridge *br)
 675 {
 676         return NULL;
 677 }
 678 static inline struct net_port_vlans *nbp_get_vlan_info(
 679                                                 const struct net_bridge_port *p)
 680 {
 681         return NULL;
 682 }
 683
 684 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 685 {
 686         return false;
 687 }
 688
 689 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 690 {
 691         return 0;
 692 }
 693 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 694 {
 695         return VLAN_N_VID;      /* Returns invalid vid */
 696 }
 697 #endif
 698
 699 /* br_netfilter.c */
 700 #ifdef CONFIG_BRIDGE_NETFILTER
 701 extern int br_netfilter_init(void);
 702 extern void br_netfilter_fini(void);
 703 extern void br_netfilter_rtable_init(struct net_bridge *);
 704 #else
 705 #define br_netfilter_init()     (0)
 706 #define br_netfilter_fini()     do { } while(0)
 707 #define br_netfilter_rtable_init(x)
 708 #endif
 709
 710 /* br_stp.c */
 711 extern void br_log_state(const struct net_bridge_port *p);
 712 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 713                                            u16 port_no);
 714 extern void br_init_port(struct net_bridge_port *p);
 715 extern void br_become_designated_port(struct net_bridge_port *p);
 716
 717 extern int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 718 extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
 719 extern int br_set_max_age(struct net_bridge *br, unsigned long x);
 720
 721
 722 /* br_stp_if.c */
 723 extern void br_stp_enable_bridge(struct net_bridge *br);
 724 extern void br_stp_disable_bridge(struct net_bridge *br);
 725 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 726 extern void br_stp_enable_port(struct net_bridge_port *p);
 727 extern void br_stp_disable_port(struct net_bridge_port *p);
 728 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 729 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 730 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 731                                        u16 newprio);
 732 extern int br_stp_set_port_priority(struct net_bridge_port *p,
 733                                     unsigned long newprio);
 734 extern int br_stp_set_path_cost(struct net_bridge_port *p,
 735                                 unsigned long path_cost);
 736 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 737
 738 /* br_stp_bpdu.c */
 739 struct stp_proto;
 740 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 741                        struct net_device *dev);
 742
 743 /* br_stp_timer.c */
 744 extern void br_stp_timer_init(struct net_bridge *br);
 745 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 746 extern unsigned long br_timer_value(const struct timer_list *timer);
 747
 748 /* br.c */
 749 #if IS_ENABLED(CONFIG_ATM_LANE)
 750 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 751 #endif
 752
 753 /* br_netlink.c */
 754 extern struct rtnl_link_ops br_link_ops;
 755 extern int br_netlink_init(void);
 756 extern void br_netlink_fini(void);
 757 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
 758 extern int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 759 extern int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 760 extern int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 761                       struct net_device *dev, u32 filter_mask);
 762
 763 #ifdef CONFIG_SYSFS
 764 /* br_sysfs_if.c */
 765 extern const struct sysfs_ops brport_sysfs_ops;
 766 extern int br_sysfs_addif(struct net_bridge_port *p);
 767 extern int br_sysfs_renameif(struct net_bridge_port *p);
 768
 769 /* br_sysfs_br.c */
 770 extern int br_sysfs_addbr(struct net_device *dev);
 771 extern void br_sysfs_delbr(struct net_device *dev);
 772
 773 #else
 774
 775 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 776 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 777 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 778 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 779 #endif /* CONFIG_SYSFS */
 780
 781 #endif