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 /* 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:1,
 102                                         is_static:1,
 103                                         added_by_user:1;
 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 #define BR_PROXYARP             0x00000100
 176
 177 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 178         struct bridge_mcast_own_query   ip4_own_query;
 179 #if IS_ENABLED(CONFIG_IPV6)
 180         struct bridge_mcast_own_query   ip6_own_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_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 201 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 202
 203 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 204
 205 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 206 {
 207         return rcu_dereference(dev->rx_handler_data);
 208 }
 209
 210 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 211 {
 212         return br_port_exists(dev) ?
 213                 rtnl_dereference(dev->rx_handler_data) : NULL;
 214 }
 215
 216 struct net_bridge
 217 {
 218         spinlock_t                      lock;
 219         struct list_head                port_list;
 220         struct net_device               *dev;
 221
 222         struct pcpu_sw_netstats         __percpu *stats;
 223         spinlock_t                      hash_lock;
 224         struct hlist_head               hash[BR_HASH_SIZE];
 225 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 226         struct rtable                   fake_rtable;
 227         bool                            nf_call_iptables;
 228         bool                            nf_call_ip6tables;
 229         bool                            nf_call_arptables;
 230 #endif
 231         u16                             group_fwd_mask;
 232         u16                             group_fwd_mask_required;
 233
 234         /* STP */
 235         bridge_id                       designated_root;
 236         bridge_id                       bridge_id;
 237         u32                             root_path_cost;
 238         unsigned long                   max_age;
 239         unsigned long                   hello_time;
 240         unsigned long                   forward_delay;
 241         unsigned long                   bridge_max_age;
 242         unsigned long                   ageing_time;
 243         unsigned long                   bridge_hello_time;
 244         unsigned long                   bridge_forward_delay;
 245
 246         u8                              group_addr[ETH_ALEN];
 247         bool                            group_addr_set;
 248         u16                             root_port;
 249
 250         enum {
 251                 BR_NO_STP,              /* no spanning tree */
 252                 BR_KERNEL_STP,          /* old STP in kernel */
 253                 BR_USER_STP,            /* new RSTP in userspace */
 254         } stp_enabled;
 255
 256         unsigned char                   topology_change;
 257         unsigned char                   topology_change_detected;
 258
 259 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 260         unsigned char                   multicast_router;
 261
 262         u8                              multicast_disabled:1;
 263         u8                              multicast_querier:1;
 264         u8                              multicast_query_use_ifaddr:1;
 265
 266         u32                             hash_elasticity;
 267         u32                             hash_max;
 268
 269         u32                             multicast_last_member_count;
 270         u32                             multicast_startup_query_count;
 271
 272         unsigned long                   multicast_last_member_interval;
 273         unsigned long                   multicast_membership_interval;
 274         unsigned long                   multicast_querier_interval;
 275         unsigned long                   multicast_query_interval;
 276         unsigned long                   multicast_query_response_interval;
 277         unsigned long                   multicast_startup_query_interval;
 278
 279         spinlock_t                      multicast_lock;
 280         struct net_bridge_mdb_htable __rcu *mdb;
 281         struct hlist_head               router_list;
 282
 283         struct timer_list               multicast_router_timer;
 284         struct bridge_mcast_other_query ip4_other_query;
 285         struct bridge_mcast_own_query   ip4_own_query;
 286         struct bridge_mcast_querier     ip4_querier;
 287 #if IS_ENABLED(CONFIG_IPV6)
 288         struct bridge_mcast_other_query ip6_other_query;
 289         struct bridge_mcast_own_query   ip6_own_query;
 290         struct bridge_mcast_querier     ip6_querier;
 291 #endif /* IS_ENABLED(CONFIG_IPV6) */
 292 #endif
 293
 294         struct timer_list               hello_timer;
 295         struct timer_list               tcn_timer;
 296         struct timer_list               topology_change_timer;
 297         struct timer_list               gc_timer;
 298         struct kobject                  *ifobj;
 299         u32                             auto_cnt;
 300 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 301         u8                              vlan_enabled;
 302         __be16                          vlan_proto;
 303         u16                             default_pvid;
 304         struct net_port_vlans __rcu     *vlan_info;
 305 #endif
 306 };
 307
 308 struct br_input_skb_cb {
 309         struct net_device *brdev;
 310
 311 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 312         int igmp;
 313         int mrouters_only;
 314 #endif
 315
 316         u16 frag_max_size;
 317
 318 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 319         bool vlan_filtered;
 320 #endif
 321 };
 322
 323 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 324
 325 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 326 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 327 #else
 328 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 329 #endif
 330
 331 #define br_printk(level, br, format, args...)   \
 332         printk(level "%s: " format, (br)->dev->name, ##args)
 333
 334 #define br_err(__br, format, args...)                   \
 335         br_printk(KERN_ERR, __br, format, ##args)
 336 #define br_warn(__br, format, args...)                  \
 337         br_printk(KERN_WARNING, __br, format, ##args)
 338 #define br_notice(__br, format, args...)                \
 339         br_printk(KERN_NOTICE, __br, format, ##args)
 340 #define br_info(__br, format, args...)                  \
 341         br_printk(KERN_INFO, __br, format, ##args)
 342
 343 #define br_debug(br, format, args...)                   \
 344         pr_debug("%s: " format,  (br)->dev->name, ##args)
 345
 346 /* called under bridge lock */
 347 static inline int br_is_root_bridge(const struct net_bridge *br)
 348 {
 349         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 350 }
 351
 352 /* br_device.c */
 353 void br_dev_setup(struct net_device *dev);
 354 void br_dev_delete(struct net_device *dev, struct list_head *list);
 355 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 356 #ifdef CONFIG_NET_POLL_CONTROLLER
 357 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 358                                        struct sk_buff *skb)
 359 {
 360         struct netpoll *np = p->np;
 361
 362         if (np)
 363                 netpoll_send_skb(np, skb);
 364 }
 365
 366 int br_netpoll_enable(struct net_bridge_port *p);
 367 void br_netpoll_disable(struct net_bridge_port *p);
 368 #else
 369 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 370                                        struct sk_buff *skb)
 371 {
 372 }
 373
 374 static inline int br_netpoll_enable(struct net_bridge_port *p)
 375 {
 376         return 0;
 377 }
 378
 379 static inline void br_netpoll_disable(struct net_bridge_port *p)
 380 {
 381 }
 382 #endif
 383
 384 /* br_fdb.c */
 385 int br_fdb_init(void);
 386 void br_fdb_fini(void);
 387 void br_fdb_flush(struct net_bridge *br);
 388 void br_fdb_find_delete_local(struct net_bridge *br,
 389                               const struct net_bridge_port *p,
 390                               const unsigned char *addr, u16 vid);
 391 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 392 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 393 void br_fdb_cleanup(unsigned long arg);
 394 void br_fdb_delete_by_port(struct net_bridge *br,
 395                            const struct net_bridge_port *p, int do_all);
 396 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 397                                           const unsigned char *addr, __u16 vid);
 398 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 399 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 400                    unsigned long off);
 401 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 402                   const unsigned char *addr, u16 vid);
 403 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 404                    const unsigned char *addr, u16 vid, bool added_by_user);
 405
 406 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 407                   struct net_device *dev, const unsigned char *addr);
 408 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 409                const unsigned char *addr, u16 nlh_flags);
 410 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 411                 struct net_device *dev, struct net_device *fdev, int idx);
 412 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 413 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 414
 415 /* br_forward.c */
 416 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 417 int br_dev_queue_push_xmit(struct sk_buff *skb);
 418 void br_forward(const struct net_bridge_port *to,
 419                 struct sk_buff *skb, struct sk_buff *skb0);
 420 int br_forward_finish(struct sk_buff *skb);
 421 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 422 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 423                       struct sk_buff *skb2, bool unicast);
 424
 425 /* br_if.c */
 426 void br_port_carrier_check(struct net_bridge_port *p);
 427 int br_add_bridge(struct net *net, const char *name);
 428 int br_del_bridge(struct net *net, const char *name);
 429 int br_add_if(struct net_bridge *br, struct net_device *dev);
 430 int br_del_if(struct net_bridge *br, struct net_device *dev);
 431 int br_min_mtu(const struct net_bridge *br);
 432 netdev_features_t br_features_recompute(struct net_bridge *br,
 433                                         netdev_features_t features);
 434 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 435 void br_manage_promisc(struct net_bridge *br);
 436
 437 /* br_input.c */
 438 int br_handle_frame_finish(struct sk_buff *skb);
 439 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 440
 441 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 442 {
 443         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 444 }
 445
 446 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 447 {
 448         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 449 }
 450
 451 /* br_ioctl.c */
 452 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 453 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 454                              void __user *arg);
 455
 456 /* br_multicast.c */
 457 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 458 extern unsigned int br_mdb_rehash_seq;
 459 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 460                      struct sk_buff *skb, u16 vid);
 461 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 462                                         struct sk_buff *skb, u16 vid);
 463 void br_multicast_add_port(struct net_bridge_port *port);
 464 void br_multicast_del_port(struct net_bridge_port *port);
 465 void br_multicast_enable_port(struct net_bridge_port *port);
 466 void br_multicast_disable_port(struct net_bridge_port *port);
 467 void br_multicast_init(struct net_bridge *br);
 468 void br_multicast_open(struct net_bridge *br);
 469 void br_multicast_stop(struct net_bridge *br);
 470 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 471                           struct sk_buff *skb);
 472 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 473                           struct sk_buff *skb, struct sk_buff *skb2);
 474 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 475 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 476 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 477 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 478 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 479 struct net_bridge_mdb_entry *
 480 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 481 struct net_bridge_mdb_entry *
 482 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 483                        struct br_ip *group);
 484 void br_multicast_free_pg(struct rcu_head *head);
 485 struct net_bridge_port_group *
 486 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 487                             struct net_bridge_port_group __rcu *next,
 488                             unsigned char state);
 489 void br_mdb_init(void);
 490 void br_mdb_uninit(void);
 491 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 492                    struct br_ip *group, int type);
 493
 494 #define mlock_dereference(X, br) \
 495         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 496
 497 static inline bool br_multicast_is_router(struct net_bridge *br)
 498 {
 499         return br->multicast_router == 2 ||
 500                (br->multicast_router == 1 &&
 501                 timer_pending(&br->multicast_router_timer));
 502 }
 503
 504 static inline bool
 505 __br_multicast_querier_exists(struct net_bridge *br,
 506                               struct bridge_mcast_other_query *querier)
 507 {
 508         return time_is_before_jiffies(querier->delay_time) &&
 509                (br->multicast_querier || timer_pending(&querier->timer));
 510 }
 511
 512 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 513                                                struct ethhdr *eth)
 514 {
 515         switch (eth->h_proto) {
 516         case (htons(ETH_P_IP)):
 517                 return __br_multicast_querier_exists(br, &br->ip4_other_query);
 518 #if IS_ENABLED(CONFIG_IPV6)
 519         case (htons(ETH_P_IPV6)):
 520                 return __br_multicast_querier_exists(br, &br->ip6_other_query);
 521 #endif
 522         default:
 523                 return false;
 524         }
 525 }
 526 #else
 527 static inline int br_multicast_rcv(struct net_bridge *br,
 528                                    struct net_bridge_port *port,
 529                                    struct sk_buff *skb,
 530                                    u16 vid)
 531 {
 532         return 0;
 533 }
 534
 535 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 536                                                       struct sk_buff *skb, u16 vid)
 537 {
 538         return NULL;
 539 }
 540
 541 static inline void br_multicast_add_port(struct net_bridge_port *port)
 542 {
 543 }
 544
 545 static inline void br_multicast_del_port(struct net_bridge_port *port)
 546 {
 547 }
 548
 549 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 550 {
 551 }
 552
 553 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 554 {
 555 }
 556
 557 static inline void br_multicast_init(struct net_bridge *br)
 558 {
 559 }
 560
 561 static inline void br_multicast_open(struct net_bridge *br)
 562 {
 563 }
 564
 565 static inline void br_multicast_stop(struct net_bridge *br)
 566 {
 567 }
 568
 569 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 570                                         struct sk_buff *skb)
 571 {
 572 }
 573
 574 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 575                                         struct sk_buff *skb,
 576                                         struct sk_buff *skb2)
 577 {
 578 }
 579 static inline bool br_multicast_is_router(struct net_bridge *br)
 580 {
 581         return 0;
 582 }
 583 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 584                                                struct ethhdr *eth)
 585 {
 586         return false;
 587 }
 588 static inline void br_mdb_init(void)
 589 {
 590 }
 591 static inline void br_mdb_uninit(void)
 592 {
 593 }
 594 #endif
 595
 596 /* br_vlan.c */
 597 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 598 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 599                         struct sk_buff *skb, u16 *vid);
 600 bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
 601                        const struct sk_buff *skb);
 602 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 603 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 604                                const struct net_port_vlans *v,
 605                                struct sk_buff *skb);
 606 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 607 int br_vlan_delete(struct net_bridge *br, u16 vid);
 608 void br_vlan_flush(struct net_bridge *br);
 609 bool br_vlan_find(struct net_bridge *br, u16 vid);
 610 void br_recalculate_fwd_mask(struct net_bridge *br);
 611 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 612 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 613 int br_vlan_init(struct net_bridge *br);
 614 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 615 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 616 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 617 void nbp_vlan_flush(struct net_bridge_port *port);
 618 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 619 int nbp_vlan_init(struct net_bridge_port *port);
 620
 621 static inline struct net_port_vlans *br_get_vlan_info(
 622                                                 const struct net_bridge *br)
 623 {
 624         return rcu_dereference_rtnl(br->vlan_info);
 625 }
 626
 627 static inline struct net_port_vlans *nbp_get_vlan_info(
 628                                                 const struct net_bridge_port *p)
 629 {
 630         return rcu_dereference_rtnl(p->vlan_info);
 631 }
 632
 633 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 634  * skb, the vlan tag will always be present if the frame was tagged.
 635  */
 636 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 637 {
 638         int err = 0;
 639
 640         if (vlan_tx_tag_present(skb))
 641                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 642         else {
 643                 *vid = 0;
 644                 err = -EINVAL;
 645         }
 646
 647         return err;
 648 }
 649
 650 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 651 {
 652         if (!v)
 653                 return 0;
 654
 655         smp_rmb();
 656         return v->pvid;
 657 }
 658
 659 static inline int br_vlan_enabled(struct net_bridge *br)
 660 {
 661         return br->vlan_enabled;
 662 }
 663 #else
 664 static inline bool br_allowed_ingress(struct net_bridge *br,
 665                                       struct net_port_vlans *v,
 666                                       struct sk_buff *skb,
 667                                       u16 *vid)
 668 {
 669         return true;
 670 }
 671
 672 static inline bool br_allowed_egress(struct net_bridge *br,
 673                                      const struct net_port_vlans *v,
 674                                      const struct sk_buff *skb)
 675 {
 676         return true;
 677 }
 678
 679 static inline bool br_should_learn(struct net_bridge_port *p,
 680                                    struct sk_buff *skb, u16 *vid)
 681 {
 682         return true;
 683 }
 684
 685 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 686                                              const struct net_port_vlans *v,
 687                                              struct sk_buff *skb)
 688 {
 689         return skb;
 690 }
 691
 692 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 693 {
 694         return -EOPNOTSUPP;
 695 }
 696
 697 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 698 {
 699         return -EOPNOTSUPP;
 700 }
 701
 702 static inline void br_vlan_flush(struct net_bridge *br)
 703 {
 704 }
 705
 706 static inline bool br_vlan_find(struct net_bridge *br, u16 vid)
 707 {
 708         return false;
 709 }
 710
 711 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 712 {
 713 }
 714
 715 static inline int br_vlan_init(struct net_bridge *br)
 716 {
 717         return 0;
 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 int nbp_vlan_init(struct net_bridge_port *port)
 751 {
 752         return 0;
 753 }
 754
 755 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 756 {
 757         return 0;
 758 }
 759 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 760 {
 761         return 0;
 762 }
 763
 764 static inline int br_vlan_enabled(struct net_bridge *br)
 765 {
 766         return 0;
 767 }
 768 #endif
 769
 770 /* br_netfilter.c */
 771 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 772 int br_nf_core_init(void);
 773 void br_nf_core_fini(void);
 774 void br_netfilter_rtable_init(struct net_bridge *);
 775 #else
 776 static inline int br_nf_core_init(void) { return 0; }
 777 static inline void br_nf_core_fini(void) {}
 778 #define br_netfilter_rtable_init(x)
 779 #endif
 780
 781 /* br_stp.c */
 782 void br_log_state(const struct net_bridge_port *p);
 783 void br_set_state(struct net_bridge_port *p, unsigned int state);
 784 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 785 void br_init_port(struct net_bridge_port *p);
 786 void br_become_designated_port(struct net_bridge_port *p);
 787
 788 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 789 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 790 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 791 int br_set_max_age(struct net_bridge *br, unsigned long x);
 792
 793
 794 /* br_stp_if.c */
 795 void br_stp_enable_bridge(struct net_bridge *br);
 796 void br_stp_disable_bridge(struct net_bridge *br);
 797 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 798 void br_stp_enable_port(struct net_bridge_port *p);
 799 void br_stp_disable_port(struct net_bridge_port *p);
 800 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 801 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 802 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 803 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 804 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 805 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 806
 807 /* br_stp_bpdu.c */
 808 struct stp_proto;
 809 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 810                 struct net_device *dev);
 811
 812 /* br_stp_timer.c */
 813 void br_stp_timer_init(struct net_bridge *br);
 814 void br_stp_port_timer_init(struct net_bridge_port *p);
 815 unsigned long br_timer_value(const struct timer_list *timer);
 816
 817 /* br.c */
 818 #if IS_ENABLED(CONFIG_ATM_LANE)
 819 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 820 #endif
 821
 822 /* br_netlink.c */
 823 extern struct rtnl_link_ops br_link_ops;
 824 int br_netlink_init(void);
 825 void br_netlink_fini(void);
 826 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 827 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 828 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 829 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 830                u32 filter_mask);
 831
 832 #ifdef CONFIG_SYSFS
 833 /* br_sysfs_if.c */
 834 extern const struct sysfs_ops brport_sysfs_ops;
 835 int br_sysfs_addif(struct net_bridge_port *p);
 836 int br_sysfs_renameif(struct net_bridge_port *p);
 837
 838 /* br_sysfs_br.c */
 839 int br_sysfs_addbr(struct net_device *dev);
 840 void br_sysfs_delbr(struct net_device *dev);
 841
 842 #else
 843
 844 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 845 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 846 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 847 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 848 #endif /* CONFIG_SYSFS */
 849
 850 #endif