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         bool                            timer_armed;
 116 };
 117
 118 struct net_bridge_mdb_htable
 119 {
 120         struct hlist_head               *mhash;
 121         struct rcu_head                 rcu;
 122         struct net_bridge_mdb_htable    *old;
 123         u32                             size;
 124         u32                             max;
 125         u32                             secret;
 126         u32                             ver;
 127 };
 128
 129 struct net_bridge_port
 130 {
 131         struct net_bridge               *br;
 132         struct net_device               *dev;
 133         struct list_head                list;
 134
 135         /* STP */
 136         u8                              priority;
 137         u8                              state;
 138         u16                             port_no;
 139         unsigned char                   topology_change_ack;
 140         unsigned char                   config_pending;
 141         port_id                         port_id;
 142         port_id                         designated_port;
 143         bridge_id                       designated_root;
 144         bridge_id                       designated_bridge;
 145         u32                             path_cost;
 146         u32                             designated_cost;
 147         unsigned long                   designated_age;
 148
 149         struct timer_list               forward_delay_timer;
 150         struct timer_list               hold_timer;
 151         struct timer_list               message_age_timer;
 152         struct kobject                  kobj;
 153         struct rcu_head                 rcu;
 154
 155         unsigned long                   flags;
 156 #define BR_HAIRPIN_MODE         0x00000001
 157 #define BR_BPDU_GUARD           0x00000002
 158 #define BR_ROOT_BLOCK           0x00000004
 159 #define BR_MULTICAST_FAST_LEAVE 0x00000008
 160 #define BR_ADMIN_COST           0x00000010
 161 #define BR_LEARNING             0x00000020
 162 #define BR_FLOOD                0x00000040
 163
 164 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 165         u32                             multicast_startup_queries_sent;
 166         unsigned char                   multicast_router;
 167         struct timer_list               multicast_router_timer;
 168         struct timer_list               multicast_query_timer;
 169         struct hlist_head               mglist;
 170         struct hlist_node               rlist;
 171 #endif
 172
 173 #ifdef CONFIG_SYSFS
 174         char                            sysfs_name[IFNAMSIZ];
 175 #endif
 176
 177 #ifdef CONFIG_NET_POLL_CONTROLLER
 178         struct netpoll                  *np;
 179 #endif
 180 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 181         struct net_port_vlans __rcu     *vlan_info;
 182 #endif
 183 };
 184
 185 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 186
 187 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 188 {
 189         struct net_bridge_port *port =
 190                         rcu_dereference_rtnl(dev->rx_handler_data);
 191
 192         return br_port_exists(dev) ? port : NULL;
 193 }
 194
 195 static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev)
 196 {
 197         return br_port_exists(dev) ?
 198                 rtnl_dereference(dev->rx_handler_data) : NULL;
 199 }
 200
 201 struct br_cpu_netstats {
 202         u64                     rx_packets;
 203         u64                     rx_bytes;
 204         u64                     tx_packets;
 205         u64                     tx_bytes;
 206         struct u64_stats_sync   syncp;
 207 };
 208
 209 struct net_bridge
 210 {
 211         spinlock_t                      lock;
 212         struct list_head                port_list;
 213         struct net_device               *dev;
 214
 215         struct br_cpu_netstats __percpu *stats;
 216         spinlock_t                      hash_lock;
 217         struct hlist_head               hash[BR_HASH_SIZE];
 218 #ifdef CONFIG_BRIDGE_NETFILTER
 219         struct rtable                   fake_rtable;
 220         bool                            nf_call_iptables;
 221         bool                            nf_call_ip6tables;
 222         bool                            nf_call_arptables;
 223 #endif
 224         u16                             group_fwd_mask;
 225
 226         /* STP */
 227         bridge_id                       designated_root;
 228         bridge_id                       bridge_id;
 229         u32                             root_path_cost;
 230         unsigned long                   max_age;
 231         unsigned long                   hello_time;
 232         unsigned long                   forward_delay;
 233         unsigned long                   bridge_max_age;
 234         unsigned long                   ageing_time;
 235         unsigned long                   bridge_hello_time;
 236         unsigned long                   bridge_forward_delay;
 237
 238         u8                              group_addr[ETH_ALEN];
 239         u16                             root_port;
 240
 241         enum {
 242                 BR_NO_STP,              /* no spanning tree */
 243                 BR_KERNEL_STP,          /* old STP in kernel */
 244                 BR_USER_STP,            /* new RSTP in userspace */
 245         } stp_enabled;
 246
 247         unsigned char                   topology_change;
 248         unsigned char                   topology_change_detected;
 249
 250 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 251         unsigned char                   multicast_router;
 252
 253         u8                              multicast_disabled:1;
 254         u8                              multicast_querier:1;
 255         u8                              multicast_query_use_ifaddr:1;
 256
 257         u32                             hash_elasticity;
 258         u32                             hash_max;
 259
 260         u32                             multicast_last_member_count;
 261         u32                             multicast_startup_queries_sent;
 262         u32                             multicast_startup_query_count;
 263
 264         unsigned long                   multicast_last_member_interval;
 265         unsigned long                   multicast_membership_interval;
 266         unsigned long                   multicast_querier_interval;
 267         unsigned long                   multicast_query_interval;
 268         unsigned long                   multicast_query_response_interval;
 269         unsigned long                   multicast_startup_query_interval;
 270         unsigned long                   multicast_querier_delay_time;
 271
 272         spinlock_t                      multicast_lock;
 273         struct net_bridge_mdb_htable __rcu *mdb;
 274         struct hlist_head               router_list;
 275
 276         struct timer_list               multicast_router_timer;
 277         struct timer_list               multicast_querier_timer;
 278         struct timer_list               multicast_query_timer;
 279 #endif
 280
 281         struct timer_list               hello_timer;
 282         struct timer_list               tcn_timer;
 283         struct timer_list               topology_change_timer;
 284         struct timer_list               gc_timer;
 285         struct kobject                  *ifobj;
 286 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 287         u8                              vlan_enabled;
 288         struct net_port_vlans __rcu     *vlan_info;
 289 #endif
 290 };
 291
 292 struct br_input_skb_cb {
 293         struct net_device *brdev;
 294 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 295         int igmp;
 296         int mrouters_only;
 297 #endif
 298 };
 299
 300 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 301
 302 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 303 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 304 #else
 305 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 306 #endif
 307
 308 #define br_printk(level, br, format, args...)   \
 309         printk(level "%s: " format, (br)->dev->name, ##args)
 310
 311 #define br_err(__br, format, args...)                   \
 312         br_printk(KERN_ERR, __br, format, ##args)
 313 #define br_warn(__br, format, args...)                  \
 314         br_printk(KERN_WARNING, __br, format, ##args)
 315 #define br_notice(__br, format, args...)                \
 316         br_printk(KERN_NOTICE, __br, format, ##args)
 317 #define br_info(__br, format, args...)                  \
 318         br_printk(KERN_INFO, __br, format, ##args)
 319
 320 #define br_debug(br, format, args...)                   \
 321         pr_debug("%s: " format,  (br)->dev->name, ##args)
 322
 323 extern struct notifier_block br_device_notifier;
 324
 325 /* called under bridge lock */
 326 static inline int br_is_root_bridge(const struct net_bridge *br)
 327 {
 328         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 329 }
 330
 331 /* br_device.c */
 332 extern void br_dev_setup(struct net_device *dev);
 333 extern void br_dev_delete(struct net_device *dev, struct list_head *list);
 334 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
 335                                struct net_device *dev);
 336 #ifdef CONFIG_NET_POLL_CONTROLLER
 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 void br_netpoll_send_skb(const struct net_bridge_port *p,
 350                                        struct sk_buff *skb)
 351 {
 352 }
 353
 354 static inline int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 355 {
 356         return 0;
 357 }
 358
 359 static inline void br_netpoll_disable(struct net_bridge_port *p)
 360 {
 361 }
 362 #endif
 363
 364 /* br_fdb.c */
 365 extern int br_fdb_init(void);
 366 extern void br_fdb_fini(void);
 367 extern void br_fdb_flush(struct net_bridge *br);
 368 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 369                               const unsigned char *newaddr);
 370 extern void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 371 extern void br_fdb_cleanup(unsigned long arg);
 372 extern void br_fdb_delete_by_port(struct net_bridge *br,
 373                                   const struct net_bridge_port *p, int do_all);
 374 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 375                                                  const unsigned char *addr,
 376                                                  __u16 vid);
 377 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 378 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 379                           unsigned long count, unsigned long off);
 380 extern int br_fdb_insert(struct net_bridge *br,
 381                          struct net_bridge_port *source,
 382                          const unsigned char *addr,
 383                          u16 vid);
 384 extern void br_fdb_update(struct net_bridge *br,
 385                           struct net_bridge_port *source,
 386                           const unsigned char *addr,
 387                           u16 vid);
 388 extern int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, u16 vid);
 389
 390 extern int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 391                          struct net_device *dev,
 392                          const unsigned char *addr);
 393 extern int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[],
 394                       struct net_device *dev,
 395                       const unsigned char *addr,
 396                       u16 nlh_flags);
 397 extern int br_fdb_dump(struct sk_buff *skb,
 398                        struct netlink_callback *cb,
 399                        struct net_device *dev,
 400                        int idx);
 401
 402 /* br_forward.c */
 403 extern void br_deliver(const struct net_bridge_port *to,
 404                 struct sk_buff *skb);
 405 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 406 extern void br_forward(const struct net_bridge_port *to,
 407                 struct sk_buff *skb, struct sk_buff *skb0);
 408 extern int br_forward_finish(struct sk_buff *skb);
 409 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb,
 410                              bool unicast);
 411 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 412                              struct sk_buff *skb2, bool unicast);
 413
 414 /* br_if.c */
 415 extern void br_port_carrier_check(struct net_bridge_port *p);
 416 extern int br_add_bridge(struct net *net, const char *name);
 417 extern int br_del_bridge(struct net *net, const char *name);
 418 extern void br_net_exit(struct net *net);
 419 extern int br_add_if(struct net_bridge *br,
 420               struct net_device *dev);
 421 extern int br_del_if(struct net_bridge *br,
 422               struct net_device *dev);
 423 extern int br_min_mtu(const struct net_bridge *br);
 424 extern netdev_features_t br_features_recompute(struct net_bridge *br,
 425         netdev_features_t features);
 426
 427 /* br_input.c */
 428 extern int br_handle_frame_finish(struct sk_buff *skb);
 429 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 430
 431 /* br_ioctl.c */
 432 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 433 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
 434
 435 /* br_multicast.c */
 436 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 437 extern unsigned int br_mdb_rehash_seq;
 438 extern int br_multicast_rcv(struct net_bridge *br,
 439                             struct net_bridge_port *port,
 440                             struct sk_buff *skb);
 441 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 442                                                struct sk_buff *skb, u16 vid);
 443 extern void br_multicast_add_port(struct net_bridge_port *port);
 444 extern void br_multicast_del_port(struct net_bridge_port *port);
 445 extern void br_multicast_enable_port(struct net_bridge_port *port);
 446 extern void br_multicast_disable_port(struct net_bridge_port *port);
 447 extern void br_multicast_init(struct net_bridge *br);
 448 extern void br_multicast_open(struct net_bridge *br);
 449 extern void br_multicast_stop(struct net_bridge *br);
 450 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 451                                  struct sk_buff *skb);
 452 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 453                                  struct sk_buff *skb, struct sk_buff *skb2);
 454 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 455 extern int br_multicast_set_port_router(struct net_bridge_port *p,
 456                                         unsigned long val);
 457 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 458 extern int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 459 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 460 extern struct net_bridge_mdb_entry *br_mdb_ip_get(
 461                                 struct net_bridge_mdb_htable *mdb,
 462                                 struct br_ip *dst);
 463 extern struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 464                                 struct net_bridge_port *port, struct br_ip *group);
 465 extern void br_multicast_free_pg(struct rcu_head *head);
 466 extern struct net_bridge_port_group *br_multicast_new_port_group(
 467                                 struct net_bridge_port *port,
 468                                 struct br_ip *group,
 469                                 struct net_bridge_port_group __rcu *next,
 470                                 unsigned char state);
 471 extern void br_mdb_init(void);
 472 extern void br_mdb_uninit(void);
 473 extern void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 474                           struct br_ip *group, int type);
 475
 476 #define mlock_dereference(X, br) \
 477         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 478
 479 #if IS_ENABLED(CONFIG_IPV6)
 480 #include <net/addrconf.h>
 481 static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
 482 {
 483         if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
 484                 return 1;
 485         return 0;
 486 }
 487 #endif
 488
 489 static inline bool br_multicast_is_router(struct net_bridge *br)
 490 {
 491         return br->multicast_router == 2 ||
 492                (br->multicast_router == 1 &&
 493                 timer_pending(&br->multicast_router_timer));
 494 }
 495
 496 static inline bool br_multicast_querier_exists(struct net_bridge *br)
 497 {
 498         return time_is_before_jiffies(br->multicast_querier_delay_time) &&
 499                (br->multicast_querier ||
 500                 timer_pending(&br->multicast_querier_timer));
 501 }
 502 #else
 503 static inline int br_multicast_rcv(struct net_bridge *br,
 504                                    struct net_bridge_port *port,
 505                                    struct sk_buff *skb)
 506 {
 507         return 0;
 508 }
 509
 510 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 511                                                       struct sk_buff *skb, u16 vid)
 512 {
 513         return NULL;
 514 }
 515
 516 static inline void br_multicast_add_port(struct net_bridge_port *port)
 517 {
 518 }
 519
 520 static inline void br_multicast_del_port(struct net_bridge_port *port)
 521 {
 522 }
 523
 524 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 525 {
 526 }
 527
 528 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 529 {
 530 }
 531
 532 static inline void br_multicast_init(struct net_bridge *br)
 533 {
 534 }
 535
 536 static inline void br_multicast_open(struct net_bridge *br)
 537 {
 538 }
 539
 540 static inline void br_multicast_stop(struct net_bridge *br)
 541 {
 542 }
 543
 544 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 545                                         struct sk_buff *skb)
 546 {
 547 }
 548
 549 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 550                                         struct sk_buff *skb,
 551                                         struct sk_buff *skb2)
 552 {
 553 }
 554 static inline bool br_multicast_is_router(struct net_bridge *br)
 555 {
 556         return 0;
 557 }
 558 static inline bool br_multicast_querier_exists(struct net_bridge *br)
 559 {
 560         return false;
 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 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 725 extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
 726 extern int br_set_max_age(struct net_bridge *br, unsigned long x);
 727
 728
 729 /* br_stp_if.c */
 730 extern void br_stp_enable_bridge(struct net_bridge *br);
 731 extern void br_stp_disable_bridge(struct net_bridge *br);
 732 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 733 extern void br_stp_enable_port(struct net_bridge_port *p);
 734 extern void br_stp_disable_port(struct net_bridge_port *p);
 735 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 736 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 737 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 738                                        u16 newprio);
 739 extern int br_stp_set_port_priority(struct net_bridge_port *p,
 740                                     unsigned long newprio);
 741 extern int br_stp_set_path_cost(struct net_bridge_port *p,
 742                                 unsigned long path_cost);
 743 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 744
 745 /* br_stp_bpdu.c */
 746 struct stp_proto;
 747 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 748                        struct net_device *dev);
 749
 750 /* br_stp_timer.c */
 751 extern void br_stp_timer_init(struct net_bridge *br);
 752 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 753 extern unsigned long br_timer_value(const struct timer_list *timer);
 754
 755 /* br.c */
 756 #if IS_ENABLED(CONFIG_ATM_LANE)
 757 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 758 #endif
 759
 760 /* br_netlink.c */
 761 extern struct rtnl_link_ops br_link_ops;
 762 extern int br_netlink_init(void);
 763 extern void br_netlink_fini(void);
 764 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
 765 extern int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 766 extern int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 767 extern int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 768                       struct net_device *dev, u32 filter_mask);
 769
 770 #ifdef CONFIG_SYSFS
 771 /* br_sysfs_if.c */
 772 extern const struct sysfs_ops brport_sysfs_ops;
 773 extern int br_sysfs_addif(struct net_bridge_port *p);
 774 extern int br_sysfs_renameif(struct net_bridge_port *p);
 775
 776 /* br_sysfs_br.c */
 777 extern int br_sysfs_addbr(struct net_device *dev);
 778 extern void br_sysfs_delbr(struct net_device *dev);
 779
 780 #else
 781
 782 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 783 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 784 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 785 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 786 #endif /* CONFIG_SYSFS */
 787
 788 #endif