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         return rcu_dereference(dev->rx_handler_data);
 187 }
 188
 189 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 190 {
 191         return br_port_exists(dev) ?
 192                 rtnl_dereference(dev->rx_handler_data) : NULL;
 193 }
 194
 195 struct br_cpu_netstats {
 196         u64                     rx_packets;
 197         u64                     rx_bytes;
 198         u64                     tx_packets;
 199         u64                     tx_bytes;
 200         struct u64_stats_sync   syncp;
 201 };
 202
 203 struct net_bridge
 204 {
 205         spinlock_t                      lock;
 206         struct list_head                port_list;
 207         struct net_device               *dev;
 208
 209         struct br_cpu_netstats __percpu *stats;
 210         spinlock_t                      hash_lock;
 211         struct hlist_head               hash[BR_HASH_SIZE];
 212 #ifdef CONFIG_BRIDGE_NETFILTER
 213         struct rtable                   fake_rtable;
 214         bool                            nf_call_iptables;
 215         bool                            nf_call_ip6tables;
 216         bool                            nf_call_arptables;
 217 #endif
 218         u16                             group_fwd_mask;
 219
 220         /* STP */
 221         bridge_id                       designated_root;
 222         bridge_id                       bridge_id;
 223         u32                             root_path_cost;
 224         unsigned long                   max_age;
 225         unsigned long                   hello_time;
 226         unsigned long                   forward_delay;
 227         unsigned long                   bridge_max_age;
 228         unsigned long                   ageing_time;
 229         unsigned long                   bridge_hello_time;
 230         unsigned long                   bridge_forward_delay;
 231
 232         u8                              group_addr[ETH_ALEN];
 233         u16                             root_port;
 234
 235         enum {
 236                 BR_NO_STP,              /* no spanning tree */
 237                 BR_KERNEL_STP,          /* old STP in kernel */
 238                 BR_USER_STP,            /* new RSTP in userspace */
 239         } stp_enabled;
 240
 241         unsigned char                   topology_change;
 242         unsigned char                   topology_change_detected;
 243
 244 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 245         unsigned char                   multicast_router;
 246
 247         u8                              multicast_disabled:1;
 248         u8                              multicast_querier:1;
 249
 250         u32                             hash_elasticity;
 251         u32                             hash_max;
 252
 253         u32                             multicast_last_member_count;
 254         u32                             multicast_startup_queries_sent;
 255         u32                             multicast_startup_query_count;
 256
 257         unsigned long                   multicast_last_member_interval;
 258         unsigned long                   multicast_membership_interval;
 259         unsigned long                   multicast_querier_interval;
 260         unsigned long                   multicast_query_interval;
 261         unsigned long                   multicast_query_response_interval;
 262         unsigned long                   multicast_startup_query_interval;
 263
 264         spinlock_t                      multicast_lock;
 265         struct net_bridge_mdb_htable __rcu *mdb;
 266         struct hlist_head               router_list;
 267
 268         struct timer_list               multicast_router_timer;
 269         struct timer_list               multicast_querier_timer;
 270         struct timer_list               multicast_query_timer;
 271 #endif
 272
 273         struct timer_list               hello_timer;
 274         struct timer_list               tcn_timer;
 275         struct timer_list               topology_change_timer;
 276         struct timer_list               gc_timer;
 277         struct kobject                  *ifobj;
 278 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 279         u8                              vlan_enabled;
 280         struct net_port_vlans __rcu     *vlan_info;
 281 #endif
 282 };
 283
 284 struct br_input_skb_cb {
 285         struct net_device *brdev;
 286 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 287         int igmp;
 288         int mrouters_only;
 289 #endif
 290 };
 291
 292 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 293
 294 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 295 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 296 #else
 297 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 298 #endif
 299
 300 #define br_printk(level, br, format, args...)   \
 301         printk(level "%s: " format, (br)->dev->name, ##args)
 302
 303 #define br_err(__br, format, args...)                   \
 304         br_printk(KERN_ERR, __br, format, ##args)
 305 #define br_warn(__br, format, args...)                  \
 306         br_printk(KERN_WARNING, __br, format, ##args)
 307 #define br_notice(__br, format, args...)                \
 308         br_printk(KERN_NOTICE, __br, format, ##args)
 309 #define br_info(__br, format, args...)                  \
 310         br_printk(KERN_INFO, __br, format, ##args)
 311
 312 #define br_debug(br, format, args...)                   \
 313         pr_debug("%s: " format,  (br)->dev->name, ##args)
 314
 315 extern struct notifier_block br_device_notifier;
 316
 317 /* called under bridge lock */
 318 static inline int br_is_root_bridge(const struct net_bridge *br)
 319 {
 320         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 321 }
 322
 323 /* br_device.c */
 324 extern void br_dev_setup(struct net_device *dev);
 325 extern void br_dev_delete(struct net_device *dev, struct list_head *list);
 326 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
 327                                struct net_device *dev);
 328 #ifdef CONFIG_NET_POLL_CONTROLLER
 329 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
 330 {
 331         return br->dev->npinfo;
 332 }
 333
 334 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 335                                        struct sk_buff *skb)
 336 {
 337         struct netpoll *np = p->np;
 338
 339         if (np)
 340                 netpoll_send_skb(np, skb);
 341 }
 342
 343 extern int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp);
 344 extern void br_netpoll_disable(struct net_bridge_port *p);
 345 #else
 346 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
 347 {
 348         return NULL;
 349 }
 350
 351 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 352                                        struct sk_buff *skb)
 353 {
 354 }
 355
 356 static inline int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 357 {
 358         return 0;
 359 }
 360
 361 static inline void br_netpoll_disable(struct net_bridge_port *p)
 362 {
 363 }
 364 #endif
 365
 366 /* br_fdb.c */
 367 extern int br_fdb_init(void);
 368 extern void br_fdb_fini(void);
 369 extern void br_fdb_flush(struct net_bridge *br);
 370 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 371                               const unsigned char *newaddr);
 372 extern void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 373 extern void br_fdb_cleanup(unsigned long arg);
 374 extern void br_fdb_delete_by_port(struct net_bridge *br,
 375                                   const struct net_bridge_port *p, int do_all);
 376 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 377                                                  const unsigned char *addr,
 378                                                  __u16 vid);
 379 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 380 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 381                           unsigned long count, unsigned long off);
 382 extern int br_fdb_insert(struct net_bridge *br,
 383                          struct net_bridge_port *source,
 384                          const unsigned char *addr,
 385                          u16 vid);
 386 extern void br_fdb_update(struct net_bridge *br,
 387                           struct net_bridge_port *source,
 388                           const unsigned char *addr,
 389                           u16 vid);
 390 extern int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, u16 vid);
 391
 392 extern int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 393                          struct net_device *dev,
 394                          const unsigned char *addr);
 395 extern int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[],
 396                       struct net_device *dev,
 397                       const unsigned char *addr,
 398                       u16 nlh_flags);
 399 extern int br_fdb_dump(struct sk_buff *skb,
 400                        struct netlink_callback *cb,
 401                        struct net_device *dev,
 402                        int idx);
 403
 404 /* br_forward.c */
 405 extern void br_deliver(const struct net_bridge_port *to,
 406                 struct sk_buff *skb);
 407 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 408 extern void br_forward(const struct net_bridge_port *to,
 409                 struct sk_buff *skb, struct sk_buff *skb0);
 410 extern int br_forward_finish(struct sk_buff *skb);
 411 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
 412 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 413                              struct sk_buff *skb2);
 414
 415 /* br_if.c */
 416 extern void br_port_carrier_check(struct net_bridge_port *p);
 417 extern int br_add_bridge(struct net *net, const char *name);
 418 extern int br_del_bridge(struct net *net, const char *name);
 419 extern void br_net_exit(struct net *net);
 420 extern int br_add_if(struct net_bridge *br,
 421               struct net_device *dev);
 422 extern int br_del_if(struct net_bridge *br,
 423               struct net_device *dev);
 424 extern int br_min_mtu(const struct net_bridge *br);
 425 extern netdev_features_t br_features_recompute(struct net_bridge *br,
 426         netdev_features_t features);
 427
 428 /* br_input.c */
 429 extern int br_handle_frame_finish(struct sk_buff *skb);
 430 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 431
 432 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 433 {
 434         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 435 }
 436
 437 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 438 {
 439         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 440 }
 441
 442 /* br_ioctl.c */
 443 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 444 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
 445
 446 /* br_multicast.c */
 447 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 448 extern unsigned int br_mdb_rehash_seq;
 449 extern int br_multicast_rcv(struct net_bridge *br,
 450                             struct net_bridge_port *port,
 451                             struct sk_buff *skb);
 452 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 453                                                struct sk_buff *skb, u16 vid);
 454 extern void br_multicast_add_port(struct net_bridge_port *port);
 455 extern void br_multicast_del_port(struct net_bridge_port *port);
 456 extern void br_multicast_enable_port(struct net_bridge_port *port);
 457 extern void br_multicast_disable_port(struct net_bridge_port *port);
 458 extern void br_multicast_init(struct net_bridge *br);
 459 extern void br_multicast_open(struct net_bridge *br);
 460 extern void br_multicast_stop(struct net_bridge *br);
 461 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 462                                  struct sk_buff *skb);
 463 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 464                                  struct sk_buff *skb, struct sk_buff *skb2);
 465 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 466 extern int br_multicast_set_port_router(struct net_bridge_port *p,
 467                                         unsigned long val);
 468 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 469 extern int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 470 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 471 extern struct net_bridge_mdb_entry *br_mdb_ip_get(
 472                                 struct net_bridge_mdb_htable *mdb,
 473                                 struct br_ip *dst);
 474 extern struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 475                                 struct net_bridge_port *port, struct br_ip *group);
 476 extern void br_multicast_free_pg(struct rcu_head *head);
 477 extern struct net_bridge_port_group *br_multicast_new_port_group(
 478                                 struct net_bridge_port *port,
 479                                 struct br_ip *group,
 480                                 struct net_bridge_port_group *next,
 481                                 unsigned char state);
 482 extern void br_mdb_init(void);
 483 extern void br_mdb_uninit(void);
 484 extern void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 485                           struct br_ip *group, int type);
 486
 487 #define mlock_dereference(X, br) \
 488         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 489
 490 #if IS_ENABLED(CONFIG_IPV6)
 491 #include <net/addrconf.h>
 492 static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
 493 {
 494         if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
 495                 return 1;
 496         return 0;
 497 }
 498 #endif
 499
 500 static inline bool br_multicast_is_router(struct net_bridge *br)
 501 {
 502         return br->multicast_router == 2 ||
 503                (br->multicast_router == 1 &&
 504                 timer_pending(&br->multicast_router_timer));
 505 }
 506 #else
 507 static inline int br_multicast_rcv(struct net_bridge *br,
 508                                    struct net_bridge_port *port,
 509                                    struct sk_buff *skb)
 510 {
 511         return 0;
 512 }
 513
 514 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 515                                                       struct sk_buff *skb, u16 vid)
 516 {
 517         return NULL;
 518 }
 519
 520 static inline void br_multicast_add_port(struct net_bridge_port *port)
 521 {
 522 }
 523
 524 static inline void br_multicast_del_port(struct net_bridge_port *port)
 525 {
 526 }
 527
 528 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 529 {
 530 }
 531
 532 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 533 {
 534 }
 535
 536 static inline void br_multicast_init(struct net_bridge *br)
 537 {
 538 }
 539
 540 static inline void br_multicast_open(struct net_bridge *br)
 541 {
 542 }
 543
 544 static inline void br_multicast_stop(struct net_bridge *br)
 545 {
 546 }
 547
 548 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 549                                         struct sk_buff *skb)
 550 {
 551 }
 552
 553 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 554                                         struct sk_buff *skb,
 555                                         struct sk_buff *skb2)
 556 {
 557 }
 558 static inline bool br_multicast_is_router(struct net_bridge *br)
 559 {
 560         return 0;
 561 }
 562 static inline void br_mdb_init(void)
 563 {
 564 }
 565 static inline void br_mdb_uninit(void)
 566 {
 567 }
 568 #endif
 569
 570 /* br_vlan.c */
 571 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 572 extern bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 573                                struct sk_buff *skb, u16 *vid);
 574 extern bool br_allowed_egress(struct net_bridge *br,
 575                               const struct net_port_vlans *v,
 576                               const struct sk_buff *skb);
 577 extern struct sk_buff *br_handle_vlan(struct net_bridge *br,
 578                                       const struct net_port_vlans *v,
 579                                       struct sk_buff *skb);
 580 extern int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 581 extern int br_vlan_delete(struct net_bridge *br, u16 vid);
 582 extern void br_vlan_flush(struct net_bridge *br);
 583 extern int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 584 extern int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 585 extern int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 586 extern void nbp_vlan_flush(struct net_bridge_port *port);
 587 extern bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 588
 589 static inline struct net_port_vlans *br_get_vlan_info(
 590                                                 const struct net_bridge *br)
 591 {
 592         return rcu_dereference_rtnl(br->vlan_info);
 593 }
 594
 595 static inline struct net_port_vlans *nbp_get_vlan_info(
 596                                                 const struct net_bridge_port *p)
 597 {
 598         return rcu_dereference_rtnl(p->vlan_info);
 599 }
 600
 601 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 602  * skb, the vlan tag will always be present if the frame was tagged.
 603  */
 604 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 605 {
 606         int err = 0;
 607
 608         if (vlan_tx_tag_present(skb))
 609                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 610         else {
 611                 *vid = 0;
 612                 err = -EINVAL;
 613         }
 614
 615         return err;
 616 }
 617
 618 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 619 {
 620         /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
 621          * vid wasn't set
 622          */
 623         smp_rmb();
 624         return (v->pvid & VLAN_TAG_PRESENT) ?
 625                         (v->pvid & ~VLAN_TAG_PRESENT) :
 626                         VLAN_N_VID;
 627 }
 628
 629 #else
 630 static inline bool br_allowed_ingress(struct net_bridge *br,
 631                                       struct net_port_vlans *v,
 632                                       struct sk_buff *skb,
 633                                       u16 *vid)
 634 {
 635         return true;
 636 }
 637
 638 static inline bool br_allowed_egress(struct net_bridge *br,
 639                                      const struct net_port_vlans *v,
 640                                      const struct sk_buff *skb)
 641 {
 642         return true;
 643 }
 644
 645 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 646                                              const struct net_port_vlans *v,
 647                                              struct sk_buff *skb)
 648 {
 649         return skb;
 650 }
 651
 652 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 653 {
 654         return -EOPNOTSUPP;
 655 }
 656
 657 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 658 {
 659         return -EOPNOTSUPP;
 660 }
 661
 662 static inline void br_vlan_flush(struct net_bridge *br)
 663 {
 664 }
 665
 666 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 667 {
 668         return -EOPNOTSUPP;
 669 }
 670
 671 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 672 {
 673         return -EOPNOTSUPP;
 674 }
 675
 676 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 677 {
 678 }
 679
 680 static inline struct net_port_vlans *br_get_vlan_info(
 681                                                 const struct net_bridge *br)
 682 {
 683         return NULL;
 684 }
 685 static inline struct net_port_vlans *nbp_get_vlan_info(
 686                                                 const struct net_bridge_port *p)
 687 {
 688         return NULL;
 689 }
 690
 691 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 692 {
 693         return false;
 694 }
 695
 696 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 697 {
 698         return 0;
 699 }
 700 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 701 {
 702         return VLAN_N_VID;      /* Returns invalid vid */
 703 }
 704 #endif
 705
 706 /* br_netfilter.c */
 707 #ifdef CONFIG_BRIDGE_NETFILTER
 708 extern int br_netfilter_init(void);
 709 extern void br_netfilter_fini(void);
 710 extern void br_netfilter_rtable_init(struct net_bridge *);
 711 #else
 712 #define br_netfilter_init()     (0)
 713 #define br_netfilter_fini()     do { } while(0)
 714 #define br_netfilter_rtable_init(x)
 715 #endif
 716
 717 /* br_stp.c */
 718 extern void br_log_state(const struct net_bridge_port *p);
 719 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 720                                            u16 port_no);
 721 extern void br_init_port(struct net_bridge_port *p);
 722 extern void br_become_designated_port(struct net_bridge_port *p);
 723
 724 extern void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 725 extern int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 726 extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
 727 extern int br_set_max_age(struct net_bridge *br, unsigned long x);
 728
 729
 730 /* br_stp_if.c */
 731 extern void br_stp_enable_bridge(struct net_bridge *br);
 732 extern void br_stp_disable_bridge(struct net_bridge *br);
 733 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 734 extern void br_stp_enable_port(struct net_bridge_port *p);
 735 extern void br_stp_disable_port(struct net_bridge_port *p);
 736 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 737 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 738 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 739                                        u16 newprio);
 740 extern int br_stp_set_port_priority(struct net_bridge_port *p,
 741                                     unsigned long newprio);
 742 extern int br_stp_set_path_cost(struct net_bridge_port *p,
 743                                 unsigned long path_cost);
 744 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 745
 746 /* br_stp_bpdu.c */
 747 struct stp_proto;
 748 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 749                        struct net_device *dev);
 750
 751 /* br_stp_timer.c */
 752 extern void br_stp_timer_init(struct net_bridge *br);
 753 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 754 extern unsigned long br_timer_value(const struct timer_list *timer);
 755
 756 /* br.c */
 757 #if IS_ENABLED(CONFIG_ATM_LANE)
 758 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 759 #endif
 760
 761 /* br_netlink.c */
 762 extern struct rtnl_link_ops br_link_ops;
 763 extern int br_netlink_init(void);
 764 extern void br_netlink_fini(void);
 765 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
 766 extern int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 767 extern int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 768 extern int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 769                       struct net_device *dev, u32 filter_mask);
 770
 771 #ifdef CONFIG_SYSFS
 772 /* br_sysfs_if.c */
 773 extern const struct sysfs_ops brport_sysfs_ops;
 774 extern int br_sysfs_addif(struct net_bridge_port *p);
 775 extern int br_sysfs_renameif(struct net_bridge_port *p);
 776
 777 /* br_sysfs_br.c */
 778 extern int br_sysfs_addbr(struct net_device *dev);
 779 extern void br_sysfs_delbr(struct net_device *dev);
 780
 781 #else
 782
 783 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 784 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 785 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 786 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 787 #endif /* CONFIG_SYSFS */
 788
 789 #endif