net/bridge/br_private.h

   1 /*
   2  *      Linux ethernet bridge
   3  *
   4  *      Authors:
   5  *      Lennert Buytenhek               <[email protected]>
   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 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
  39 #define BR_GROUPFWD_8021AD      0xB801u
  40
  41 /* Path to usermode spanning tree program */
  42 #define BR_STP_PROG     "/sbin/bridge-stp"
  43
  44 typedef struct bridge_id bridge_id;
  45 typedef struct mac_addr mac_addr;
  46 typedef __u16 port_id;
  47
  48 struct bridge_id
  49 {
  50         unsigned char   prio[2];
  51         unsigned char   addr[ETH_ALEN];
  52 };
  53
  54 struct mac_addr
  55 {
  56         unsigned char   addr[ETH_ALEN];
  57 };
  58
  59 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  60 /* our own querier */
  61 struct bridge_mcast_own_query {
  62         struct timer_list       timer;
  63         u32                     startup_sent;
  64 };
  65
  66 /* other querier */
  67 struct bridge_mcast_other_query {
  68         struct timer_list               timer;
  69         unsigned long                   delay_time;
  70 };
  71
  72 /* selected querier */
  73 struct bridge_mcast_querier {
  74         struct br_ip addr;
  75         struct net_bridge_port __rcu    *port;
  76 };
  77 #endif
  78
  79 struct net_port_vlans {
  80         u16                             port_idx;
  81         u16                             pvid;
  82         union {
  83                 struct net_bridge_port          *port;
  84                 struct net_bridge               *br;
  85         }                               parent;
  86         struct rcu_head                 rcu;
  87         unsigned long                   vlan_bitmap[BR_VLAN_BITMAP_LEN];
  88         unsigned long                   untagged_bitmap[BR_VLAN_BITMAP_LEN];
  89         u16                             num_vlans;
  90 };
  91
  92 struct net_bridge_fdb_entry
  93 {
  94         struct hlist_node               hlist;
  95         struct net_bridge_port          *dst;
  96
  97         struct rcu_head                 rcu;
  98         unsigned long                   updated;
  99         unsigned long                   used;
 100         mac_addr                        addr;
 101         unsigned char                   is_local;
 102         unsigned char                   is_static;
 103         unsigned char                   added_by_user;
 104         __u16                           vlan_id;
 105 };
 106
 107 struct net_bridge_port_group {
 108         struct net_bridge_port          *port;
 109         struct net_bridge_port_group __rcu *next;
 110         struct hlist_node               mglist;
 111         struct rcu_head                 rcu;
 112         struct timer_list               timer;
 113         struct br_ip                    addr;
 114         unsigned char                   state;
 115 };
 116
 117 struct net_bridge_mdb_entry
 118 {
 119         struct hlist_node               hlist[2];
 120         struct net_bridge               *br;
 121         struct net_bridge_port_group __rcu *ports;
 122         struct rcu_head                 rcu;
 123         struct timer_list               timer;
 124         struct br_ip                    addr;
 125         bool                            mglist;
 126 };
 127
 128 struct net_bridge_mdb_htable
 129 {
 130         struct hlist_head               *mhash;
 131         struct rcu_head                 rcu;
 132         struct net_bridge_mdb_htable    *old;
 133         u32                             size;
 134         u32                             max;
 135         u32                             secret;
 136         u32                             ver;
 137 };
 138
 139 struct net_bridge_port
 140 {
 141         struct net_bridge               *br;
 142         struct net_device               *dev;
 143         struct list_head                list;
 144
 145         /* STP */
 146         u8                              priority;
 147         u8                              state;
 148         u16                             port_no;
 149         unsigned char                   topology_change_ack;
 150         unsigned char                   config_pending;
 151         port_id                         port_id;
 152         port_id                         designated_port;
 153         bridge_id                       designated_root;
 154         bridge_id                       designated_bridge;
 155         u32                             path_cost;
 156         u32                             designated_cost;
 157         unsigned long                   designated_age;
 158
 159         struct timer_list               forward_delay_timer;
 160         struct timer_list               hold_timer;
 161         struct timer_list               message_age_timer;
 162         struct kobject                  kobj;
 163         struct rcu_head                 rcu;
 164
 165         unsigned long                   flags;
 166 #define BR_HAIRPIN_MODE         0x00000001
 167 #define BR_BPDU_GUARD           0x00000002
 168 #define BR_ROOT_BLOCK           0x00000004
 169 #define BR_MULTICAST_FAST_LEAVE 0x00000008
 170 #define BR_ADMIN_COST           0x00000010
 171 #define BR_LEARNING             0x00000020
 172 #define BR_FLOOD                0x00000040
 173 #define BR_AUTO_MASK (BR_FLOOD | BR_LEARNING)
 174 #define BR_PROMISC              0x00000080
 175
 176 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 177         struct bridge_mcast_own_query   ip4_own_query;
 178 #if IS_ENABLED(CONFIG_IPV6)
 179         struct bridge_mcast_own_query   ip6_own_query;
 180 #endif /* IS_ENABLED(CONFIG_IPV6) */
 181         unsigned char                   multicast_router;
 182         struct timer_list               multicast_router_timer;
 183         struct hlist_head               mglist;
 184         struct hlist_node               rlist;
 185 #endif
 186
 187 #ifdef CONFIG_SYSFS
 188         char                            sysfs_name[IFNAMSIZ];
 189 #endif
 190
 191 #ifdef CONFIG_NET_POLL_CONTROLLER
 192         struct netpoll                  *np;
 193 #endif
 194 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 195         struct net_port_vlans __rcu     *vlan_info;
 196 #endif
 197 };
 198
 199 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 200 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 201
 202 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 203
 204 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 205 {
 206         return rcu_dereference(dev->rx_handler_data);
 207 }
 208
 209 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 210 {
 211         return br_port_exists(dev) ?
 212                 rtnl_dereference(dev->rx_handler_data) : NULL;
 213 }
 214
 215 struct net_bridge
 216 {
 217         spinlock_t                      lock;
 218         struct list_head                port_list;
 219         struct net_device               *dev;
 220
 221         struct pcpu_sw_netstats         __percpu *stats;
 222         spinlock_t                      hash_lock;
 223         struct hlist_head               hash[BR_HASH_SIZE];
 224 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 225         struct rtable                   fake_rtable;
 226         bool                            nf_call_iptables;
 227         bool                            nf_call_ip6tables;
 228         bool                            nf_call_arptables;
 229 #endif
 230         u16                             group_fwd_mask;
 231         u16                             group_fwd_mask_required;
 232
 233         /* STP */
 234         bridge_id                       designated_root;
 235         bridge_id                       bridge_id;
 236         u32                             root_path_cost;
 237         unsigned long                   max_age;
 238         unsigned long                   hello_time;
 239         unsigned long                   forward_delay;
 240         unsigned long                   bridge_max_age;
 241         unsigned long                   ageing_time;
 242         unsigned long                   bridge_hello_time;
 243         unsigned long                   bridge_forward_delay;
 244
 245         u8                              group_addr[ETH_ALEN];
 246         bool                            group_addr_set;
 247         u16                             root_port;
 248
 249         enum {
 250                 BR_NO_STP,              /* no spanning tree */
 251                 BR_KERNEL_STP,          /* old STP in kernel */
 252                 BR_USER_STP,            /* new RSTP in userspace */
 253         } stp_enabled;
 254
 255         unsigned char                   topology_change;
 256         unsigned char                   topology_change_detected;
 257
 258 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 259         unsigned char                   multicast_router;
 260
 261         u8                              multicast_disabled:1;
 262         u8                              multicast_querier:1;
 263         u8                              multicast_query_use_ifaddr:1;
 264
 265         u32                             hash_elasticity;
 266         u32                             hash_max;
 267
 268         u32                             multicast_last_member_count;
 269         u32                             multicast_startup_query_count;
 270
 271         unsigned long                   multicast_last_member_interval;
 272         unsigned long                   multicast_membership_interval;
 273         unsigned long                   multicast_querier_interval;
 274         unsigned long                   multicast_query_interval;
 275         unsigned long                   multicast_query_response_interval;
 276         unsigned long                   multicast_startup_query_interval;
 277
 278         spinlock_t                      multicast_lock;
 279         struct net_bridge_mdb_htable __rcu *mdb;
 280         struct hlist_head               router_list;
 281
 282         struct timer_list               multicast_router_timer;
 283         struct bridge_mcast_other_query ip4_other_query;
 284         struct bridge_mcast_own_query   ip4_own_query;
 285         struct bridge_mcast_querier     ip4_querier;
 286 #if IS_ENABLED(CONFIG_IPV6)
 287         struct bridge_mcast_other_query ip6_other_query;
 288         struct bridge_mcast_own_query   ip6_own_query;
 289         struct bridge_mcast_querier     ip6_querier;
 290 #endif /* IS_ENABLED(CONFIG_IPV6) */
 291 #endif
 292
 293         struct timer_list               hello_timer;
 294         struct timer_list               tcn_timer;
 295         struct timer_list               topology_change_timer;
 296         struct timer_list               gc_timer;
 297         struct kobject                  *ifobj;
 298         u32                             auto_cnt;
 299 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 300         u8                              vlan_enabled;
 301         __be16                          vlan_proto;
 302         u16                             default_pvid;
 303         struct net_port_vlans __rcu     *vlan_info;
 304 #endif
 305 };
 306
 307 struct br_input_skb_cb {
 308         struct net_device *brdev;
 309
 310 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 311         int igmp;
 312         int mrouters_only;
 313 #endif
 314
 315         u16 frag_max_size;
 316
 317 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 318         bool vlan_filtered;
 319 #endif
 320 };
 321
 322 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 323
 324 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 325 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 326 #else
 327 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 328 #endif
 329
 330 #define br_printk(level, br, format, args...)   \
 331         printk(level "%s: " format, (br)->dev->name, ##args)
 332
 333 #define br_err(__br, format, args...)                   \
 334         br_printk(KERN_ERR, __br, format, ##args)
 335 #define br_warn(__br, format, args...)                  \
 336         br_printk(KERN_WARNING, __br, format, ##args)
 337 #define br_notice(__br, format, args...)                \
 338         br_printk(KERN_NOTICE, __br, format, ##args)
 339 #define br_info(__br, format, args...)                  \
 340         br_printk(KERN_INFO, __br, format, ##args)
 341
 342 #define br_debug(br, format, args...)                   \
 343         pr_debug("%s: " format,  (br)->dev->name, ##args)
 344
 345 /* called under bridge lock */
 346 static inline int br_is_root_bridge(const struct net_bridge *br)
 347 {
 348         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 349 }
 350
 351 /* br_device.c */
 352 void br_dev_setup(struct net_device *dev);
 353 void br_dev_delete(struct net_device *dev, struct list_head *list);
 354 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 355 #ifdef CONFIG_NET_POLL_CONTROLLER
 356 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 357                                        struct sk_buff *skb)
 358 {
 359         struct netpoll *np = p->np;
 360
 361         if (np)
 362                 netpoll_send_skb(np, skb);
 363 }
 364
 365 int br_netpoll_enable(struct net_bridge_port *p);
 366 void br_netpoll_disable(struct net_bridge_port *p);
 367 #else
 368 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 369                                        struct sk_buff *skb)
 370 {
 371 }
 372
 373 static inline int br_netpoll_enable(struct net_bridge_port *p)
 374 {
 375         return 0;
 376 }
 377
 378 static inline void br_netpoll_disable(struct net_bridge_port *p)
 379 {
 380 }
 381 #endif
 382
 383 /* br_fdb.c */
 384 int br_fdb_init(void);
 385 void br_fdb_fini(void);
 386 void br_fdb_flush(struct net_bridge *br);
 387 void br_fdb_find_delete_local(struct net_bridge *br,
 388                               const struct net_bridge_port *p,
 389                               const unsigned char *addr, u16 vid);
 390 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 391 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 392 void br_fdb_cleanup(unsigned long arg);
 393 void br_fdb_delete_by_port(struct net_bridge *br,
 394                            const struct net_bridge_port *p, int do_all);
 395 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 396                                           const unsigned char *addr, __u16 vid);
 397 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 398 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 399                    unsigned long off);
 400 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 401                   const unsigned char *addr, u16 vid);
 402 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 403                    const unsigned char *addr, u16 vid, bool added_by_user);
 404
 405 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 406                   struct net_device *dev, const unsigned char *addr);
 407 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 408                const unsigned char *addr, u16 nlh_flags);
 409 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 410                 struct net_device *dev, struct net_device *fdev, int idx);
 411 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 412 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 413
 414 /* br_forward.c */
 415 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 416 int br_dev_queue_push_xmit(struct sk_buff *skb);
 417 void br_forward(const struct net_bridge_port *to,
 418                 struct sk_buff *skb, struct sk_buff *skb0);
 419 int br_forward_finish(struct sk_buff *skb);
 420 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 421 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 422                       struct sk_buff *skb2, bool unicast);
 423
 424 /* br_if.c */
 425 void br_port_carrier_check(struct net_bridge_port *p);
 426 int br_add_bridge(struct net *net, const char *name);
 427 int br_del_bridge(struct net *net, const char *name);
 428 int br_add_if(struct net_bridge *br, struct net_device *dev);
 429 int br_del_if(struct net_bridge *br, struct net_device *dev);
 430 int br_min_mtu(const struct net_bridge *br);
 431 netdev_features_t br_features_recompute(struct net_bridge *br,
 432                                         netdev_features_t features);
 433 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 434 void br_manage_promisc(struct net_bridge *br);
 435
 436 /* br_input.c */
 437 int br_handle_frame_finish(struct sk_buff *skb);
 438 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 439
 440 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 441 {
 442         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 443 }
 444
 445 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 446 {
 447         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 448 }
 449
 450 /* br_ioctl.c */
 451 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 452 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 453                              void __user *arg);
 454
 455 /* br_multicast.c */
 456 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 457 extern unsigned int br_mdb_rehash_seq;
 458 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 459                      struct sk_buff *skb, u16 vid);
 460 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 461                                         struct sk_buff *skb, u16 vid);
 462 void br_multicast_add_port(struct net_bridge_port *port);
 463 void br_multicast_del_port(struct net_bridge_port *port);
 464 void br_multicast_enable_port(struct net_bridge_port *port);
 465 void br_multicast_disable_port(struct net_bridge_port *port);
 466 void br_multicast_init(struct net_bridge *br);
 467 void br_multicast_open(struct net_bridge *br);
 468 void br_multicast_stop(struct net_bridge *br);
 469 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 470                           struct sk_buff *skb);
 471 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 472                           struct sk_buff *skb, struct sk_buff *skb2);
 473 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 474 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 475 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 476 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 477 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 478 struct net_bridge_mdb_entry *
 479 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 480 struct net_bridge_mdb_entry *
 481 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 482                        struct br_ip *group);
 483 void br_multicast_free_pg(struct rcu_head *head);
 484 struct net_bridge_port_group *
 485 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 486                             struct net_bridge_port_group __rcu *next,
 487                             unsigned char state);
 488 void br_mdb_init(void);
 489 void br_mdb_uninit(void);
 490 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 491                    struct br_ip *group, int type);
 492
 493 #define mlock_dereference(X, br) \
 494         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 495
 496 static inline bool br_multicast_is_router(struct net_bridge *br)
 497 {
 498         return br->multicast_router == 2 ||
 499                (br->multicast_router == 1 &&
 500                 timer_pending(&br->multicast_router_timer));
 501 }
 502
 503 static inline bool
 504 __br_multicast_querier_exists(struct net_bridge *br,
 505                               struct bridge_mcast_other_query *querier)
 506 {
 507         return time_is_before_jiffies(querier->delay_time) &&
 508                (br->multicast_querier || timer_pending(&querier->timer));
 509 }
 510
 511 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 512                                                struct ethhdr *eth)
 513 {
 514         switch (eth->h_proto) {
 515         case (htons(ETH_P_IP)):
 516                 return __br_multicast_querier_exists(br, &br->ip4_other_query);
 517 #if IS_ENABLED(CONFIG_IPV6)
 518         case (htons(ETH_P_IPV6)):
 519                 return __br_multicast_querier_exists(br, &br->ip6_other_query);
 520 #endif
 521         default:
 522                 return false;
 523         }
 524 }
 525 #else
 526 static inline int br_multicast_rcv(struct net_bridge *br,
 527                                    struct net_bridge_port *port,
 528                                    struct sk_buff *skb,
 529                                    u16 vid)
 530 {
 531         return 0;
 532 }
 533
 534 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 535                                                       struct sk_buff *skb, u16 vid)
 536 {
 537         return NULL;
 538 }
 539
 540 static inline void br_multicast_add_port(struct net_bridge_port *port)
 541 {
 542 }
 543
 544 static inline void br_multicast_del_port(struct net_bridge_port *port)
 545 {
 546 }
 547
 548 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 549 {
 550 }
 551
 552 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 553 {
 554 }
 555
 556 static inline void br_multicast_init(struct net_bridge *br)
 557 {
 558 }
 559
 560 static inline void br_multicast_open(struct net_bridge *br)
 561 {
 562 }
 563
 564 static inline void br_multicast_stop(struct net_bridge *br)
 565 {
 566 }
 567
 568 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 569                                         struct sk_buff *skb)
 570 {
 571 }
 572
 573 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 574                                         struct sk_buff *skb,
 575                                         struct sk_buff *skb2)
 576 {
 577 }
 578 static inline bool br_multicast_is_router(struct net_bridge *br)
 579 {
 580         return 0;
 581 }
 582 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 583                                                struct ethhdr *eth)
 584 {
 585         return false;
 586 }
 587 static inline void br_mdb_init(void)
 588 {
 589 }
 590 static inline void br_mdb_uninit(void)
 591 {
 592 }
 593 #endif
 594
 595 /* br_vlan.c */
 596 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 597 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 598                         struct sk_buff *skb, u16 *vid);
 599 bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
 600                        const struct sk_buff *skb);
 601 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 602 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 603                                const struct net_port_vlans *v,
 604                                struct sk_buff *skb);
 605 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 606 int br_vlan_delete(struct net_bridge *br, u16 vid);
 607 void br_vlan_flush(struct net_bridge *br);
 608 bool br_vlan_find(struct net_bridge *br, u16 vid);
 609 void br_recalculate_fwd_mask(struct net_bridge *br);
 610 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 611 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 612 int br_vlan_init(struct net_bridge *br);
 613 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 614 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 615 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 616 void nbp_vlan_flush(struct net_bridge_port *port);
 617 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 618 int nbp_vlan_init(struct net_bridge_port *port);
 619
 620 static inline struct net_port_vlans *br_get_vlan_info(
 621                                                 const struct net_bridge *br)
 622 {
 623         return rcu_dereference_rtnl(br->vlan_info);
 624 }
 625
 626 static inline struct net_port_vlans *nbp_get_vlan_info(
 627                                                 const struct net_bridge_port *p)
 628 {
 629         return rcu_dereference_rtnl(p->vlan_info);
 630 }
 631
 632 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 633  * skb, the vlan tag will always be present if the frame was tagged.
 634  */
 635 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 636 {
 637         int err = 0;
 638
 639         if (vlan_tx_tag_present(skb))
 640                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 641         else {
 642                 *vid = 0;
 643                 err = -EINVAL;
 644         }
 645
 646         return err;
 647 }
 648
 649 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 650 {
 651         if (!v)
 652                 return 0;
 653
 654         smp_rmb();
 655         return v->pvid;
 656 }
 657
 658 static inline int br_vlan_enabled(struct net_bridge *br)
 659 {
 660         return br->vlan_enabled;
 661 }
 662 #else
 663 static inline bool br_allowed_ingress(struct net_bridge *br,
 664                                       struct net_port_vlans *v,
 665                                       struct sk_buff *skb,
 666                                       u16 *vid)
 667 {
 668         return true;
 669 }
 670
 671 static inline bool br_allowed_egress(struct net_bridge *br,
 672                                      const struct net_port_vlans *v,
 673                                      const struct sk_buff *skb)
 674 {
 675         return true;
 676 }
 677
 678 static inline bool br_should_learn(struct net_bridge_port *p,
 679                                    struct sk_buff *skb, u16 *vid)
 680 {
 681         return true;
 682 }
 683
 684 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 685                                              const struct net_port_vlans *v,
 686                                              struct sk_buff *skb)
 687 {
 688         return skb;
 689 }
 690
 691 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 692 {
 693         return -EOPNOTSUPP;
 694 }
 695
 696 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 697 {
 698         return -EOPNOTSUPP;
 699 }
 700
 701 static inline void br_vlan_flush(struct net_bridge *br)
 702 {
 703 }
 704
 705 static inline bool br_vlan_find(struct net_bridge *br, u16 vid)
 706 {
 707         return false;
 708 }
 709
 710 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 711 {
 712 }
 713
 714 static inline int br_vlan_init(struct net_bridge *br)
 715 {
 716         return 0;
 717 }
 718
 719 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 720 {
 721         return -EOPNOTSUPP;
 722 }
 723
 724 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 725 {
 726         return -EOPNOTSUPP;
 727 }
 728
 729 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 730 {
 731 }
 732
 733 static inline struct net_port_vlans *br_get_vlan_info(
 734                                                 const struct net_bridge *br)
 735 {
 736         return NULL;
 737 }
 738 static inline struct net_port_vlans *nbp_get_vlan_info(
 739                                                 const struct net_bridge_port *p)
 740 {
 741         return NULL;
 742 }
 743
 744 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 745 {
 746         return false;
 747 }
 748
 749 static inline int nbp_vlan_init(struct net_bridge_port *port)
 750 {
 751         return 0;
 752 }
 753
 754 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 755 {
 756         return 0;
 757 }
 758 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 759 {
 760         return 0;
 761 }
 762
 763 static inline int br_vlan_enabled(struct net_bridge *br)
 764 {
 765         return 0;
 766 }
 767 #endif
 768
 769 /* br_netfilter.c */
 770 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 771 int br_nf_core_init(void);
 772 void br_nf_core_fini(void);
 773 void br_netfilter_rtable_init(struct net_bridge *);
 774 #else
 775 static inline int br_nf_core_init(void) { return 0; }
 776 static inline void br_nf_core_fini(void) {}
 777 #define br_netfilter_rtable_init(x)
 778 #endif
 779
 780 /* br_stp.c */
 781 void br_log_state(const struct net_bridge_port *p);
 782 void br_set_state(struct net_bridge_port *p, unsigned int state);
 783 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 784 void br_init_port(struct net_bridge_port *p);
 785 void br_become_designated_port(struct net_bridge_port *p);
 786
 787 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 788 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 789 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 790 int br_set_max_age(struct net_bridge *br, unsigned long x);
 791
 792
 793 /* br_stp_if.c */
 794 void br_stp_enable_bridge(struct net_bridge *br);
 795 void br_stp_disable_bridge(struct net_bridge *br);
 796 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 797 void br_stp_enable_port(struct net_bridge_port *p);
 798 void br_stp_disable_port(struct net_bridge_port *p);
 799 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 800 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 801 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 802 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 803 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 804 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 805
 806 /* br_stp_bpdu.c */
 807 struct stp_proto;
 808 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 809                 struct net_device *dev);
 810
 811 /* br_stp_timer.c */
 812 void br_stp_timer_init(struct net_bridge *br);
 813 void br_stp_port_timer_init(struct net_bridge_port *p);
 814 unsigned long br_timer_value(const struct timer_list *timer);
 815
 816 /* br.c */
 817 #if IS_ENABLED(CONFIG_ATM_LANE)
 818 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 819 #endif
 820
 821 /* br_netlink.c */
 822 extern struct rtnl_link_ops br_link_ops;
 823 int br_netlink_init(void);
 824 void br_netlink_fini(void);
 825 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 826 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 827 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 828 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 829                u32 filter_mask);
 830
 831 #ifdef CONFIG_SYSFS
 832 /* br_sysfs_if.c */
 833 extern const struct sysfs_ops brport_sysfs_ops;
 834 int br_sysfs_addif(struct net_bridge_port *p);
 835 int br_sysfs_renameif(struct net_bridge_port *p);
 836
 837 /* br_sysfs_br.c */
 838 int br_sysfs_addbr(struct net_device *dev);
 839 void br_sysfs_delbr(struct net_device *dev);
 840
 841 #else
 842
 843 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 844 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 845 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 846 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 847 #endif /* CONFIG_SYSFS */
 848
 849 #endif