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