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 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  70 /* our own querier */
  71 struct bridge_mcast_query {
  72         struct timer_list       timer;
  73         u32                     startup_sent;
  74 };
  75
  76 /* other querier */
  77 struct bridge_mcast_querier {
  78         struct timer_list               timer;
  79         unsigned long                   delay_time;
  80 };
  81 #endif
  82
  83 struct net_port_vlans {
  84         u16                             port_idx;
  85         u16                             pvid;
  86         union {
  87                 struct net_bridge_port          *port;
  88                 struct net_bridge               *br;
  89         }                               parent;
  90         struct rcu_head                 rcu;
  91         unsigned long                   vlan_bitmap[BR_VLAN_BITMAP_LEN];
  92         unsigned long                   untagged_bitmap[BR_VLAN_BITMAP_LEN];
  93         u16                             num_vlans;
  94 };
  95
  96 struct net_bridge_fdb_entry
  97 {
  98         struct hlist_node               hlist;
  99         struct net_bridge_port          *dst;
 100
 101         struct rcu_head                 rcu;
 102         unsigned long                   updated;
 103         unsigned long                   used;
 104         mac_addr                        addr;
 105         unsigned char                   is_local;
 106         unsigned char                   is_static;
 107         __u16                           vlan_id;
 108 };
 109
 110 struct net_bridge_port_group {
 111         struct net_bridge_port          *port;
 112         struct net_bridge_port_group __rcu *next;
 113         struct hlist_node               mglist;
 114         struct rcu_head                 rcu;
 115         struct timer_list               timer;
 116         struct br_ip                    addr;
 117         unsigned char                   state;
 118 };
 119
 120 struct net_bridge_mdb_entry
 121 {
 122         struct hlist_node               hlist[2];
 123         struct net_bridge               *br;
 124         struct net_bridge_port_group __rcu *ports;
 125         struct rcu_head                 rcu;
 126         struct timer_list               timer;
 127         struct br_ip                    addr;
 128         bool                            mglist;
 129 };
 130
 131 struct net_bridge_mdb_htable
 132 {
 133         struct hlist_head               *mhash;
 134         struct rcu_head                 rcu;
 135         struct net_bridge_mdb_htable    *old;
 136         u32                             size;
 137         u32                             max;
 138         u32                             secret;
 139         u32                             ver;
 140 };
 141
 142 struct net_bridge_port
 143 {
 144         struct net_bridge               *br;
 145         struct net_device               *dev;
 146         struct list_head                list;
 147
 148         /* STP */
 149         u8                              priority;
 150         u8                              state;
 151         u16                             port_no;
 152         unsigned char                   topology_change_ack;
 153         unsigned char                   config_pending;
 154         port_id                         port_id;
 155         port_id                         designated_port;
 156         bridge_id                       designated_root;
 157         bridge_id                       designated_bridge;
 158         u32                             path_cost;
 159         u32                             designated_cost;
 160         unsigned long                   designated_age;
 161
 162         struct timer_list               forward_delay_timer;
 163         struct timer_list               hold_timer;
 164         struct timer_list               message_age_timer;
 165         struct kobject                  kobj;
 166         struct rcu_head                 rcu;
 167
 168         unsigned long                   flags;
 169 #define BR_HAIRPIN_MODE         0x00000001
 170 #define BR_BPDU_GUARD           0x00000002
 171 #define BR_ROOT_BLOCK           0x00000004
 172 #define BR_MULTICAST_FAST_LEAVE 0x00000008
 173 #define BR_ADMIN_COST           0x00000010
 174 #define BR_LEARNING             0x00000020
 175 #define BR_FLOOD                0x00000040
 176
 177 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 178         struct bridge_mcast_query       ip4_query;
 179 #if IS_ENABLED(CONFIG_IPV6)
 180         struct bridge_mcast_query       ip6_query;
 181 #endif /* IS_ENABLED(CONFIG_IPV6) */
 182         unsigned char                   multicast_router;
 183         struct timer_list               multicast_router_timer;
 184         struct hlist_head               mglist;
 185         struct hlist_node               rlist;
 186 #endif
 187
 188 #ifdef CONFIG_SYSFS
 189         char                            sysfs_name[IFNAMSIZ];
 190 #endif
 191
 192 #ifdef CONFIG_NET_POLL_CONTROLLER
 193         struct netpoll                  *np;
 194 #endif
 195 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 196         struct net_port_vlans __rcu     *vlan_info;
 197 #endif
 198 };
 199
 200 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 201
 202 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 203 {
 204         return rcu_dereference(dev->rx_handler_data);
 205 }
 206
 207 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 208 {
 209         return br_port_exists(dev) ?
 210                 rtnl_dereference(dev->rx_handler_data) : NULL;
 211 }
 212
 213 struct br_cpu_netstats {
 214         u64                     rx_packets;
 215         u64                     rx_bytes;
 216         u64                     tx_packets;
 217         u64                     tx_bytes;
 218         struct u64_stats_sync   syncp;
 219 };
 220
 221 struct net_bridge
 222 {
 223         spinlock_t                      lock;
 224         struct list_head                port_list;
 225         struct net_device               *dev;
 226
 227         struct br_cpu_netstats __percpu *stats;
 228         spinlock_t                      hash_lock;
 229         struct hlist_head               hash[BR_HASH_SIZE];
 230 #ifdef CONFIG_BRIDGE_NETFILTER
 231         struct rtable                   fake_rtable;
 232         bool                            nf_call_iptables;
 233         bool                            nf_call_ip6tables;
 234         bool                            nf_call_arptables;
 235 #endif
 236         u16                             group_fwd_mask;
 237
 238         /* STP */
 239         bridge_id                       designated_root;
 240         bridge_id                       bridge_id;
 241         u32                             root_path_cost;
 242         unsigned long                   max_age;
 243         unsigned long                   hello_time;
 244         unsigned long                   forward_delay;
 245         unsigned long                   bridge_max_age;
 246         unsigned long                   ageing_time;
 247         unsigned long                   bridge_hello_time;
 248         unsigned long                   bridge_forward_delay;
 249
 250         u8                              group_addr[ETH_ALEN];
 251         u16                             root_port;
 252
 253         enum {
 254                 BR_NO_STP,              /* no spanning tree */
 255                 BR_KERNEL_STP,          /* old STP in kernel */
 256                 BR_USER_STP,            /* new RSTP in userspace */
 257         } stp_enabled;
 258
 259         unsigned char                   topology_change;
 260         unsigned char                   topology_change_detected;
 261
 262 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 263         unsigned char                   multicast_router;
 264
 265         u8                              multicast_disabled:1;
 266         u8                              multicast_querier:1;
 267         u8                              multicast_query_use_ifaddr:1;
 268         u8                              has_ipv6_addr:1;
 269
 270         u32                             hash_elasticity;
 271         u32                             hash_max;
 272
 273         u32                             multicast_last_member_count;
 274         u32                             multicast_startup_query_count;
 275
 276         unsigned long                   multicast_last_member_interval;
 277         unsigned long                   multicast_membership_interval;
 278         unsigned long                   multicast_querier_interval;
 279         unsigned long                   multicast_query_interval;
 280         unsigned long                   multicast_query_response_interval;
 281         unsigned long                   multicast_startup_query_interval;
 282
 283         spinlock_t                      multicast_lock;
 284         struct net_bridge_mdb_htable __rcu *mdb;
 285         struct hlist_head               router_list;
 286
 287         struct timer_list               multicast_router_timer;
 288         struct bridge_mcast_querier     ip4_querier;
 289         struct bridge_mcast_query       ip4_query;
 290 #if IS_ENABLED(CONFIG_IPV6)
 291         struct bridge_mcast_querier     ip6_querier;
 292         struct bridge_mcast_query       ip6_query;
 293 #endif /* IS_ENABLED(CONFIG_IPV6) */
 294 #endif
 295
 296         struct timer_list               hello_timer;
 297         struct timer_list               tcn_timer;
 298         struct timer_list               topology_change_timer;
 299         struct timer_list               gc_timer;
 300         struct kobject                  *ifobj;
 301 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 302         u8                              vlan_enabled;
 303         struct net_port_vlans __rcu     *vlan_info;
 304 #endif
 305 };
 306
 307 struct br_input_skb_cb {
 308         struct net_device *brdev;
 309 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 310         int igmp;
 311         int mrouters_only;
 312 #endif
 313 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 314         bool vlan_filtered;
 315 #endif
 316 };
 317
 318 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 319
 320 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 321 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 322 #else
 323 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 324 #endif
 325
 326 #define br_printk(level, br, format, args...)   \
 327         printk(level "%s: " format, (br)->dev->name, ##args)
 328
 329 #define br_err(__br, format, args...)                   \
 330         br_printk(KERN_ERR, __br, format, ##args)
 331 #define br_warn(__br, format, args...)                  \
 332         br_printk(KERN_WARNING, __br, format, ##args)
 333 #define br_notice(__br, format, args...)                \
 334         br_printk(KERN_NOTICE, __br, format, ##args)
 335 #define br_info(__br, format, args...)                  \
 336         br_printk(KERN_INFO, __br, format, ##args)
 337
 338 #define br_debug(br, format, args...)                   \
 339         pr_debug("%s: " format,  (br)->dev->name, ##args)
 340
 341 extern struct notifier_block br_device_notifier;
 342
 343 /* called under bridge lock */
 344 static inline int br_is_root_bridge(const struct net_bridge *br)
 345 {
 346         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 347 }
 348
 349 /* br_device.c */
 350 extern void br_dev_setup(struct net_device *dev);
 351 extern void br_dev_delete(struct net_device *dev, struct list_head *list);
 352 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
 353                                struct net_device *dev);
 354 #ifdef CONFIG_NET_POLL_CONTROLLER
 355 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 356                                        struct sk_buff *skb)
 357 {
 358         struct netpoll *np = p->np;
 359
 360         if (np)
 361                 netpoll_send_skb(np, skb);
 362 }
 363
 364 extern int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp);
 365 extern void br_netpoll_disable(struct net_bridge_port *p);
 366 #else
 367 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 368                                        struct sk_buff *skb)
 369 {
 370 }
 371
 372 static inline int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 373 {
 374         return 0;
 375 }
 376
 377 static inline void br_netpoll_disable(struct net_bridge_port *p)
 378 {
 379 }
 380 #endif
 381
 382 /* br_fdb.c */
 383 extern int br_fdb_init(void);
 384 extern void br_fdb_fini(void);
 385 extern void br_fdb_flush(struct net_bridge *br);
 386 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 387                               const unsigned char *newaddr);
 388 extern void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 389 extern void br_fdb_cleanup(unsigned long arg);
 390 extern void br_fdb_delete_by_port(struct net_bridge *br,
 391                                   const struct net_bridge_port *p, int do_all);
 392 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 393                                                  const unsigned char *addr,
 394                                                  __u16 vid);
 395 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 396 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 397                           unsigned long count, unsigned long off);
 398 extern int br_fdb_insert(struct net_bridge *br,
 399                          struct net_bridge_port *source,
 400                          const unsigned char *addr,
 401                          u16 vid);
 402 extern void br_fdb_update(struct net_bridge *br,
 403                           struct net_bridge_port *source,
 404                           const unsigned char *addr,
 405                           u16 vid);
 406 extern int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, u16 vid);
 407
 408 extern int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 409                          struct net_device *dev,
 410                          const unsigned char *addr);
 411 extern int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[],
 412                       struct net_device *dev,
 413                       const unsigned char *addr,
 414                       u16 nlh_flags);
 415 extern int br_fdb_dump(struct sk_buff *skb,
 416                        struct netlink_callback *cb,
 417                        struct net_device *dev,
 418                        int idx);
 419
 420 /* br_forward.c */
 421 extern void br_deliver(const struct net_bridge_port *to,
 422                 struct sk_buff *skb);
 423 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 424 extern void br_forward(const struct net_bridge_port *to,
 425                 struct sk_buff *skb, struct sk_buff *skb0);
 426 extern int br_forward_finish(struct sk_buff *skb);
 427 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb,
 428                              bool unicast);
 429 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 430                              struct sk_buff *skb2, bool unicast);
 431
 432 /* br_if.c */
 433 extern void br_port_carrier_check(struct net_bridge_port *p);
 434 extern int br_add_bridge(struct net *net, const char *name);
 435 extern int br_del_bridge(struct net *net, const char *name);
 436 extern void br_net_exit(struct net *net);
 437 extern int br_add_if(struct net_bridge *br,
 438               struct net_device *dev);
 439 extern int br_del_if(struct net_bridge *br,
 440               struct net_device *dev);
 441 extern int br_min_mtu(const struct net_bridge *br);
 442 extern netdev_features_t br_features_recompute(struct net_bridge *br,
 443         netdev_features_t features);
 444
 445 /* br_input.c */
 446 extern int br_handle_frame_finish(struct sk_buff *skb);
 447 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 448
 449 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 450 {
 451         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 452 }
 453
 454 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 455 {
 456         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 457 }
 458
 459 /* br_ioctl.c */
 460 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 461 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
 462
 463 /* br_multicast.c */
 464 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 465 extern unsigned int br_mdb_rehash_seq;
 466 extern int br_multicast_rcv(struct net_bridge *br,
 467                             struct net_bridge_port *port,
 468                             struct sk_buff *skb);
 469 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 470                                                struct sk_buff *skb, u16 vid);
 471 extern void br_multicast_add_port(struct net_bridge_port *port);
 472 extern void br_multicast_del_port(struct net_bridge_port *port);
 473 extern void br_multicast_enable_port(struct net_bridge_port *port);
 474 extern void br_multicast_disable_port(struct net_bridge_port *port);
 475 extern void br_multicast_init(struct net_bridge *br);
 476 extern void br_multicast_open(struct net_bridge *br);
 477 extern void br_multicast_stop(struct net_bridge *br);
 478 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 479                                  struct sk_buff *skb);
 480 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 481                                  struct sk_buff *skb, struct sk_buff *skb2);
 482 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 483 extern int br_multicast_set_port_router(struct net_bridge_port *p,
 484                                         unsigned long val);
 485 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 486 extern int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 487 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 488 extern struct net_bridge_mdb_entry *br_mdb_ip_get(
 489                                 struct net_bridge_mdb_htable *mdb,
 490                                 struct br_ip *dst);
 491 extern struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 492                                 struct net_bridge_port *port, struct br_ip *group);
 493 extern void br_multicast_free_pg(struct rcu_head *head);
 494 extern struct net_bridge_port_group *br_multicast_new_port_group(
 495                                 struct net_bridge_port *port,
 496                                 struct br_ip *group,
 497                                 struct net_bridge_port_group __rcu *next,
 498                                 unsigned char state);
 499 extern void br_mdb_init(void);
 500 extern void br_mdb_uninit(void);
 501 extern void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 502                           struct br_ip *group, int type);
 503
 504 #define mlock_dereference(X, br) \
 505         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 506
 507 static inline bool br_multicast_is_router(struct net_bridge *br)
 508 {
 509         return br->multicast_router == 2 ||
 510                (br->multicast_router == 1 &&
 511                 timer_pending(&br->multicast_router_timer));
 512 }
 513
 514 static inline bool
 515 __br_multicast_querier_exists(struct net_bridge *br,
 516                                 struct bridge_mcast_querier *querier,
 517                                 const bool is_ipv6)
 518 {
 519         bool own_querier_enabled;
 520
 521         if (br->multicast_querier) {
 522                 if (is_ipv6 && !br->has_ipv6_addr)
 523                         own_querier_enabled = false;
 524                 else
 525                         own_querier_enabled = true;
 526         } else {
 527                 own_querier_enabled = false;
 528         }
 529
 530         return time_is_before_jiffies(querier->delay_time) &&
 531                (own_querier_enabled || timer_pending(&querier->timer));
 532 }
 533
 534 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 535                                                struct ethhdr *eth)
 536 {
 537         switch (eth->h_proto) {
 538         case (htons(ETH_P_IP)):
 539                 return __br_multicast_querier_exists(br,
 540                         &br->ip4_querier, false);
 541 #if IS_ENABLED(CONFIG_IPV6)
 542         case (htons(ETH_P_IPV6)):
 543                 return __br_multicast_querier_exists(br,
 544                         &br->ip6_querier, true);
 545 #endif
 546         default:
 547                 return false;
 548         }
 549 }
 550 #else
 551 static inline int br_multicast_rcv(struct net_bridge *br,
 552                                    struct net_bridge_port *port,
 553                                    struct sk_buff *skb)
 554 {
 555         return 0;
 556 }
 557
 558 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 559                                                       struct sk_buff *skb, u16 vid)
 560 {
 561         return NULL;
 562 }
 563
 564 static inline void br_multicast_add_port(struct net_bridge_port *port)
 565 {
 566 }
 567
 568 static inline void br_multicast_del_port(struct net_bridge_port *port)
 569 {
 570 }
 571
 572 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 573 {
 574 }
 575
 576 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 577 {
 578 }
 579
 580 static inline void br_multicast_init(struct net_bridge *br)
 581 {
 582 }
 583
 584 static inline void br_multicast_open(struct net_bridge *br)
 585 {
 586 }
 587
 588 static inline void br_multicast_stop(struct net_bridge *br)
 589 {
 590 }
 591
 592 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 593                                         struct sk_buff *skb)
 594 {
 595 }
 596
 597 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 598                                         struct sk_buff *skb,
 599                                         struct sk_buff *skb2)
 600 {
 601 }
 602 static inline bool br_multicast_is_router(struct net_bridge *br)
 603 {
 604         return 0;
 605 }
 606 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 607                                                struct ethhdr *eth)
 608 {
 609         return false;
 610 }
 611 static inline void br_mdb_init(void)
 612 {
 613 }
 614 static inline void br_mdb_uninit(void)
 615 {
 616 }
 617 #endif
 618
 619 /* br_vlan.c */
 620 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 621 extern bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 622                                struct sk_buff *skb, u16 *vid);
 623 extern bool br_allowed_egress(struct net_bridge *br,
 624                               const struct net_port_vlans *v,
 625                               const struct sk_buff *skb);
 626 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 627 extern struct sk_buff *br_handle_vlan(struct net_bridge *br,
 628                                       const struct net_port_vlans *v,
 629                                       struct sk_buff *skb);
 630 extern int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 631 extern int br_vlan_delete(struct net_bridge *br, u16 vid);
 632 extern void br_vlan_flush(struct net_bridge *br);
 633 extern int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 634 extern int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 635 extern int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 636 extern void nbp_vlan_flush(struct net_bridge_port *port);
 637 extern bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 638
 639 static inline struct net_port_vlans *br_get_vlan_info(
 640                                                 const struct net_bridge *br)
 641 {
 642         return rcu_dereference_rtnl(br->vlan_info);
 643 }
 644
 645 static inline struct net_port_vlans *nbp_get_vlan_info(
 646                                                 const struct net_bridge_port *p)
 647 {
 648         return rcu_dereference_rtnl(p->vlan_info);
 649 }
 650
 651 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 652  * skb, the vlan tag will always be present if the frame was tagged.
 653  */
 654 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 655 {
 656         int err = 0;
 657
 658         if (vlan_tx_tag_present(skb))
 659                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 660         else {
 661                 *vid = 0;
 662                 err = -EINVAL;
 663         }
 664
 665         return err;
 666 }
 667
 668 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 669 {
 670         /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
 671          * vid wasn't set
 672          */
 673         smp_rmb();
 674         return v->pvid ?: VLAN_N_VID;
 675 }
 676
 677 #else
 678 static inline bool br_allowed_ingress(struct net_bridge *br,
 679                                       struct net_port_vlans *v,
 680                                       struct sk_buff *skb,
 681                                       u16 *vid)
 682 {
 683         return true;
 684 }
 685
 686 static inline bool br_allowed_egress(struct net_bridge *br,
 687                                      const struct net_port_vlans *v,
 688                                      const struct sk_buff *skb)
 689 {
 690         return true;
 691 }
 692
 693 static inline bool br_should_learn(struct net_bridge_port *p,
 694                                    struct sk_buff *skb, u16 *vid)
 695 {
 696         return true;
 697 }
 698
 699 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 700                                              const struct net_port_vlans *v,
 701                                              struct sk_buff *skb)
 702 {
 703         return skb;
 704 }
 705
 706 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 707 {
 708         return -EOPNOTSUPP;
 709 }
 710
 711 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 712 {
 713         return -EOPNOTSUPP;
 714 }
 715
 716 static inline void br_vlan_flush(struct net_bridge *br)
 717 {
 718 }
 719
 720 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 721 {
 722         return -EOPNOTSUPP;
 723 }
 724
 725 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 726 {
 727         return -EOPNOTSUPP;
 728 }
 729
 730 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 731 {
 732 }
 733
 734 static inline struct net_port_vlans *br_get_vlan_info(
 735                                                 const struct net_bridge *br)
 736 {
 737         return NULL;
 738 }
 739 static inline struct net_port_vlans *nbp_get_vlan_info(
 740                                                 const struct net_bridge_port *p)
 741 {
 742         return NULL;
 743 }
 744
 745 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 746 {
 747         return false;
 748 }
 749
 750 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 751 {
 752         return 0;
 753 }
 754 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 755 {
 756         return VLAN_N_VID;      /* Returns invalid vid */
 757 }
 758 #endif
 759
 760 /* br_netfilter.c */
 761 #ifdef CONFIG_BRIDGE_NETFILTER
 762 extern int br_netfilter_init(void);
 763 extern void br_netfilter_fini(void);
 764 extern void br_netfilter_rtable_init(struct net_bridge *);
 765 #else
 766 #define br_netfilter_init()     (0)
 767 #define br_netfilter_fini()     do { } while(0)
 768 #define br_netfilter_rtable_init(x)
 769 #endif
 770
 771 /* br_stp.c */
 772 extern void br_log_state(const struct net_bridge_port *p);
 773 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 774                                            u16 port_no);
 775 extern void br_init_port(struct net_bridge_port *p);
 776 extern void br_become_designated_port(struct net_bridge_port *p);
 777
 778 extern void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 779 extern int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 780 extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
 781 extern int br_set_max_age(struct net_bridge *br, unsigned long x);
 782
 783
 784 /* br_stp_if.c */
 785 extern void br_stp_enable_bridge(struct net_bridge *br);
 786 extern void br_stp_disable_bridge(struct net_bridge *br);
 787 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 788 extern void br_stp_enable_port(struct net_bridge_port *p);
 789 extern void br_stp_disable_port(struct net_bridge_port *p);
 790 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 791 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 792 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 793                                        u16 newprio);
 794 extern int br_stp_set_port_priority(struct net_bridge_port *p,
 795                                     unsigned long newprio);
 796 extern int br_stp_set_path_cost(struct net_bridge_port *p,
 797                                 unsigned long path_cost);
 798 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 799
 800 /* br_stp_bpdu.c */
 801 struct stp_proto;
 802 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 803                        struct net_device *dev);
 804
 805 /* br_stp_timer.c */
 806 extern void br_stp_timer_init(struct net_bridge *br);
 807 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 808 extern unsigned long br_timer_value(const struct timer_list *timer);
 809
 810 /* br.c */
 811 #if IS_ENABLED(CONFIG_ATM_LANE)
 812 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 813 #endif
 814
 815 /* br_netlink.c */
 816 extern struct rtnl_link_ops br_link_ops;
 817 extern int br_netlink_init(void);
 818 extern void br_netlink_fini(void);
 819 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
 820 extern int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 821 extern int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 822 extern int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 823                       struct net_device *dev, u32 filter_mask);
 824
 825 #ifdef CONFIG_SYSFS
 826 /* br_sysfs_if.c */
 827 extern const struct sysfs_ops brport_sysfs_ops;
 828 extern int br_sysfs_addif(struct net_bridge_port *p);
 829 extern int br_sysfs_renameif(struct net_bridge_port *p);
 830
 831 /* br_sysfs_br.c */
 832 extern int br_sysfs_addbr(struct net_device *dev);
 833 extern void br_sysfs_delbr(struct net_device *dev);
 834
 835 #else
 836
 837 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 838 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 839 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 840 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 841 #endif /* CONFIG_SYSFS */
 842
 843 #endif