kernel/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                                         added_by_external_learn:1;
 105         __u16                           vlan_id;
 106 };
 107
 108 struct net_bridge_port_group {
 109         struct net_bridge_port          *port;
 110         struct net_bridge_port_group __rcu *next;
 111         struct hlist_node               mglist;
 112         struct rcu_head                 rcu;
 113         struct timer_list               timer;
 114         struct br_ip                    addr;
 115         unsigned char                   state;
 116 };
 117
 118 struct net_bridge_mdb_entry
 119 {
 120         struct hlist_node               hlist[2];
 121         struct net_bridge               *br;
 122         struct net_bridge_port_group __rcu *ports;
 123         struct rcu_head                 rcu;
 124         struct timer_list               timer;
 125         struct br_ip                    addr;
 126         bool                            mglist;
 127 };
 128
 129 struct net_bridge_mdb_htable
 130 {
 131         struct hlist_head               *mhash;
 132         struct rcu_head                 rcu;
 133         struct net_bridge_mdb_htable    *old;
 134         u32                             size;
 135         u32                             max;
 136         u32                             secret;
 137         u32                             ver;
 138 };
 139
 140 struct net_bridge_port
 141 {
 142         struct net_bridge               *br;
 143         struct net_device               *dev;
 144         struct list_head                list;
 145
 146         /* STP */
 147         u8                              priority;
 148         u8                              state;
 149         u16                             port_no;
 150         unsigned char                   topology_change_ack;
 151         unsigned char                   config_pending;
 152         port_id                         port_id;
 153         port_id                         designated_port;
 154         bridge_id                       designated_root;
 155         bridge_id                       designated_bridge;
 156         u32                             path_cost;
 157         u32                             designated_cost;
 158         unsigned long                   designated_age;
 159
 160         struct timer_list               forward_delay_timer;
 161         struct timer_list               hold_timer;
 162         struct timer_list               message_age_timer;
 163         struct kobject                  kobj;
 164         struct rcu_head                 rcu;
 165
 166         unsigned long                   flags;
 167
 168 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 169         struct bridge_mcast_own_query   ip4_own_query;
 170 #if IS_ENABLED(CONFIG_IPV6)
 171         struct bridge_mcast_own_query   ip6_own_query;
 172 #endif /* IS_ENABLED(CONFIG_IPV6) */
 173         unsigned char                   multicast_router;
 174         struct timer_list               multicast_router_timer;
 175         struct hlist_head               mglist;
 176         struct hlist_node               rlist;
 177 #endif
 178
 179 #ifdef CONFIG_SYSFS
 180         char                            sysfs_name[IFNAMSIZ];
 181 #endif
 182
 183 #ifdef CONFIG_NET_POLL_CONTROLLER
 184         struct netpoll                  *np;
 185 #endif
 186 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 187         struct net_port_vlans __rcu     *vlan_info;
 188 #endif
 189 };
 190
 191 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 192 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 193
 194 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 195
 196 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 197 {
 198         return rcu_dereference(dev->rx_handler_data);
 199 }
 200
 201 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 202 {
 203         return br_port_exists(dev) ?
 204                 rtnl_dereference(dev->rx_handler_data) : NULL;
 205 }
 206
 207 struct net_bridge
 208 {
 209         spinlock_t                      lock;
 210         struct list_head                port_list;
 211         struct net_device               *dev;
 212
 213         struct pcpu_sw_netstats         __percpu *stats;
 214         spinlock_t                      hash_lock;
 215         struct hlist_head               hash[BR_HASH_SIZE];
 216 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 217         struct rtable                   fake_rtable;
 218         bool                            nf_call_iptables;
 219         bool                            nf_call_ip6tables;
 220         bool                            nf_call_arptables;
 221 #endif
 222         u16                             group_fwd_mask;
 223         u16                             group_fwd_mask_required;
 224
 225         /* STP */
 226         bridge_id                       designated_root;
 227         bridge_id                       bridge_id;
 228         u32                             root_path_cost;
 229         unsigned long                   max_age;
 230         unsigned long                   hello_time;
 231         unsigned long                   forward_delay;
 232         unsigned long                   bridge_max_age;
 233         unsigned long                   ageing_time;
 234         unsigned long                   bridge_hello_time;
 235         unsigned long                   bridge_forward_delay;
 236
 237         u8                              group_addr[ETH_ALEN];
 238         bool                            group_addr_set;
 239         u16                             root_port;
 240
 241         enum {
 242                 BR_NO_STP,              /* no spanning tree */
 243                 BR_KERNEL_STP,          /* old STP in kernel */
 244                 BR_USER_STP,            /* new RSTP in userspace */
 245         } stp_enabled;
 246
 247         unsigned char                   topology_change;
 248         unsigned char                   topology_change_detected;
 249
 250 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 251         unsigned char                   multicast_router;
 252
 253         u8                              multicast_disabled:1;
 254         u8                              multicast_querier:1;
 255         u8                              multicast_query_use_ifaddr:1;
 256
 257         u32                             hash_elasticity;
 258         u32                             hash_max;
 259
 260         u32                             multicast_last_member_count;
 261         u32                             multicast_startup_query_count;
 262
 263         unsigned long                   multicast_last_member_interval;
 264         unsigned long                   multicast_membership_interval;
 265         unsigned long                   multicast_querier_interval;
 266         unsigned long                   multicast_query_interval;
 267         unsigned long                   multicast_query_response_interval;
 268         unsigned long                   multicast_startup_query_interval;
 269
 270         spinlock_t                      multicast_lock;
 271         struct net_bridge_mdb_htable __rcu *mdb;
 272         struct hlist_head               router_list;
 273
 274         struct timer_list               multicast_router_timer;
 275         struct bridge_mcast_other_query ip4_other_query;
 276         struct bridge_mcast_own_query   ip4_own_query;
 277         struct bridge_mcast_querier     ip4_querier;
 278 #if IS_ENABLED(CONFIG_IPV6)
 279         struct bridge_mcast_other_query ip6_other_query;
 280         struct bridge_mcast_own_query   ip6_own_query;
 281         struct bridge_mcast_querier     ip6_querier;
 282 #endif /* IS_ENABLED(CONFIG_IPV6) */
 283 #endif
 284
 285         struct timer_list               hello_timer;
 286         struct timer_list               tcn_timer;
 287         struct timer_list               topology_change_timer;
 288         struct timer_list               gc_timer;
 289         struct kobject                  *ifobj;
 290         u32                             auto_cnt;
 291 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 292         u8                              vlan_enabled;
 293         __be16                          vlan_proto;
 294         u16                             default_pvid;
 295         struct net_port_vlans __rcu     *vlan_info;
 296 #endif
 297 };
 298
 299 struct br_input_skb_cb {
 300         struct net_device *brdev;
 301
 302 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 303         int igmp;
 304         int mrouters_only;
 305 #endif
 306
 307         u16 frag_max_size;
 308         bool proxyarp_replied;
 309
 310 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 311         bool vlan_filtered;
 312 #endif
 313 };
 314
 315 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 316
 317 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 318 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 319 #else
 320 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 321 #endif
 322
 323 #define br_printk(level, br, format, args...)   \
 324         printk(level "%s: " format, (br)->dev->name, ##args)
 325
 326 #define br_err(__br, format, args...)                   \
 327         br_printk(KERN_ERR, __br, format, ##args)
 328 #define br_warn(__br, format, args...)                  \
 329         br_printk(KERN_WARNING, __br, format, ##args)
 330 #define br_notice(__br, format, args...)                \
 331         br_printk(KERN_NOTICE, __br, format, ##args)
 332 #define br_info(__br, format, args...)                  \
 333         br_printk(KERN_INFO, __br, format, ##args)
 334
 335 #define br_debug(br, format, args...)                   \
 336         pr_debug("%s: " format,  (br)->dev->name, ##args)
 337
 338 /* called under bridge lock */
 339 static inline int br_is_root_bridge(const struct net_bridge *br)
 340 {
 341         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 342 }
 343
 344 /* br_device.c */
 345 void br_dev_setup(struct net_device *dev);
 346 void br_dev_delete(struct net_device *dev, struct list_head *list);
 347 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 348 #ifdef CONFIG_NET_POLL_CONTROLLER
 349 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 350                                        struct sk_buff *skb)
 351 {
 352         struct netpoll *np = p->np;
 353
 354         if (np)
 355                 netpoll_send_skb(np, skb);
 356 }
 357
 358 int br_netpoll_enable(struct net_bridge_port *p);
 359 void br_netpoll_disable(struct net_bridge_port *p);
 360 #else
 361 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 362                                        struct sk_buff *skb)
 363 {
 364 }
 365
 366 static inline int br_netpoll_enable(struct net_bridge_port *p)
 367 {
 368         return 0;
 369 }
 370
 371 static inline void br_netpoll_disable(struct net_bridge_port *p)
 372 {
 373 }
 374 #endif
 375
 376 /* br_fdb.c */
 377 int br_fdb_init(void);
 378 void br_fdb_fini(void);
 379 void br_fdb_flush(struct net_bridge *br);
 380 void br_fdb_find_delete_local(struct net_bridge *br,
 381                               const struct net_bridge_port *p,
 382                               const unsigned char *addr, u16 vid);
 383 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 384 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 385 void br_fdb_cleanup(unsigned long arg);
 386 void br_fdb_delete_by_port(struct net_bridge *br,
 387                            const struct net_bridge_port *p, int do_all);
 388 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 389                                           const unsigned char *addr, __u16 vid);
 390 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 391 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 392                    unsigned long off);
 393 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 394                   const unsigned char *addr, u16 vid);
 395 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 396                    const unsigned char *addr, u16 vid, bool added_by_user);
 397
 398 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 399                   struct net_device *dev, const unsigned char *addr, u16 vid);
 400 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 401                const unsigned char *addr, u16 vid, u16 nlh_flags);
 402 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 403                 struct net_device *dev, struct net_device *fdev, int idx);
 404 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 405 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 406 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 407                               const unsigned char *addr, u16 vid);
 408 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 409                               const unsigned char *addr, u16 vid);
 410
 411 /* br_forward.c */
 412 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 413 int br_dev_queue_push_xmit(struct sock *sk, struct sk_buff *skb);
 414 void br_forward(const struct net_bridge_port *to,
 415                 struct sk_buff *skb, struct sk_buff *skb0);
 416 int br_forward_finish(struct sock *sk, struct sk_buff *skb);
 417 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 418 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 419                       struct sk_buff *skb2, bool unicast);
 420
 421 /* br_if.c */
 422 void br_port_carrier_check(struct net_bridge_port *p);
 423 int br_add_bridge(struct net *net, const char *name);
 424 int br_del_bridge(struct net *net, const char *name);
 425 int br_add_if(struct net_bridge *br, struct net_device *dev);
 426 int br_del_if(struct net_bridge *br, struct net_device *dev);
 427 int br_min_mtu(const struct net_bridge *br);
 428 netdev_features_t br_features_recompute(struct net_bridge *br,
 429                                         netdev_features_t features);
 430 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 431 void br_manage_promisc(struct net_bridge *br);
 432
 433 /* br_input.c */
 434 int br_handle_frame_finish(struct sock *sk, struct sk_buff *skb);
 435 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 436
 437 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 438 {
 439         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 440 }
 441
 442 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 443 {
 444         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 445 }
 446
 447 /* br_ioctl.c */
 448 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 449 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 450                              void __user *arg);
 451
 452 /* br_multicast.c */
 453 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 454 extern unsigned int br_mdb_rehash_seq;
 455 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 456                      struct sk_buff *skb, u16 vid);
 457 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 458                                         struct sk_buff *skb, u16 vid);
 459 void br_multicast_add_port(struct net_bridge_port *port);
 460 void br_multicast_del_port(struct net_bridge_port *port);
 461 void br_multicast_enable_port(struct net_bridge_port *port);
 462 void br_multicast_disable_port(struct net_bridge_port *port);
 463 void br_multicast_init(struct net_bridge *br);
 464 void br_multicast_open(struct net_bridge *br);
 465 void br_multicast_stop(struct net_bridge *br);
 466 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 467                           struct sk_buff *skb);
 468 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 469                           struct sk_buff *skb, struct sk_buff *skb2);
 470 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 471 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 472 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 473 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 474 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 475 struct net_bridge_mdb_entry *
 476 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 477 struct net_bridge_mdb_entry *
 478 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 479                        struct br_ip *group);
 480 void br_multicast_free_pg(struct rcu_head *head);
 481 struct net_bridge_port_group *
 482 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 483                             struct net_bridge_port_group __rcu *next,
 484                             unsigned char state);
 485 void br_mdb_init(void);
 486 void br_mdb_uninit(void);
 487 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 488                    struct br_ip *group, int type);
 489
 490 #define mlock_dereference(X, br) \
 491         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 492
 493 static inline bool br_multicast_is_router(struct net_bridge *br)
 494 {
 495         return br->multicast_router == 2 ||
 496                (br->multicast_router == 1 &&
 497                 timer_pending(&br->multicast_router_timer));
 498 }
 499
 500 static inline bool
 501 __br_multicast_querier_exists(struct net_bridge *br,
 502                               struct bridge_mcast_other_query *querier)
 503 {
 504         return time_is_before_jiffies(querier->delay_time) &&
 505                (br->multicast_querier || timer_pending(&querier->timer));
 506 }
 507
 508 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 509                                                struct ethhdr *eth)
 510 {
 511         switch (eth->h_proto) {
 512         case (htons(ETH_P_IP)):
 513                 return __br_multicast_querier_exists(br, &br->ip4_other_query);
 514 #if IS_ENABLED(CONFIG_IPV6)
 515         case (htons(ETH_P_IPV6)):
 516                 return __br_multicast_querier_exists(br, &br->ip6_other_query);
 517 #endif
 518         default:
 519                 return false;
 520         }
 521 }
 522 #else
 523 static inline int br_multicast_rcv(struct net_bridge *br,
 524                                    struct net_bridge_port *port,
 525                                    struct sk_buff *skb,
 526                                    u16 vid)
 527 {
 528         return 0;
 529 }
 530
 531 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 532                                                       struct sk_buff *skb, u16 vid)
 533 {
 534         return NULL;
 535 }
 536
 537 static inline void br_multicast_add_port(struct net_bridge_port *port)
 538 {
 539 }
 540
 541 static inline void br_multicast_del_port(struct net_bridge_port *port)
 542 {
 543 }
 544
 545 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 546 {
 547 }
 548
 549 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 550 {
 551 }
 552
 553 static inline void br_multicast_init(struct net_bridge *br)
 554 {
 555 }
 556
 557 static inline void br_multicast_open(struct net_bridge *br)
 558 {
 559 }
 560
 561 static inline void br_multicast_stop(struct net_bridge *br)
 562 {
 563 }
 564
 565 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 566                                         struct sk_buff *skb)
 567 {
 568 }
 569
 570 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 571                                         struct sk_buff *skb,
 572                                         struct sk_buff *skb2)
 573 {
 574 }
 575 static inline bool br_multicast_is_router(struct net_bridge *br)
 576 {
 577         return 0;
 578 }
 579 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 580                                                struct ethhdr *eth)
 581 {
 582         return false;
 583 }
 584 static inline void br_mdb_init(void)
 585 {
 586 }
 587 static inline void br_mdb_uninit(void)
 588 {
 589 }
 590 #endif
 591
 592 /* br_vlan.c */
 593 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 594 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 595                         struct sk_buff *skb, u16 *vid);
 596 bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
 597                        const struct sk_buff *skb);
 598 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 599 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 600                                const struct net_port_vlans *v,
 601                                struct sk_buff *skb);
 602 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 603 int br_vlan_delete(struct net_bridge *br, u16 vid);
 604 void br_vlan_flush(struct net_bridge *br);
 605 bool br_vlan_find(struct net_bridge *br, u16 vid);
 606 void br_recalculate_fwd_mask(struct net_bridge *br);
 607 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 608 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 609 int br_vlan_init(struct net_bridge *br);
 610 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 611 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 612 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 613 void nbp_vlan_flush(struct net_bridge_port *port);
 614 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 615 int nbp_vlan_init(struct net_bridge_port *port);
 616
 617 static inline struct net_port_vlans *br_get_vlan_info(
 618                                                 const struct net_bridge *br)
 619 {
 620         return rcu_dereference_rtnl(br->vlan_info);
 621 }
 622
 623 static inline struct net_port_vlans *nbp_get_vlan_info(
 624                                                 const struct net_bridge_port *p)
 625 {
 626         return rcu_dereference_rtnl(p->vlan_info);
 627 }
 628
 629 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 630  * skb, the vlan tag will always be present if the frame was tagged.
 631  */
 632 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 633 {
 634         int err = 0;
 635
 636         if (skb_vlan_tag_present(skb))
 637                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 638         else {
 639                 *vid = 0;
 640                 err = -EINVAL;
 641         }
 642
 643         return err;
 644 }
 645
 646 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 647 {
 648         if (!v)
 649                 return 0;
 650
 651         smp_rmb();
 652         return v->pvid;
 653 }
 654
 655 static inline int br_vlan_enabled(struct net_bridge *br)
 656 {
 657         return br->vlan_enabled;
 658 }
 659 #else
 660 static inline bool br_allowed_ingress(struct net_bridge *br,
 661                                       struct net_port_vlans *v,
 662                                       struct sk_buff *skb,
 663                                       u16 *vid)
 664 {
 665         return true;
 666 }
 667
 668 static inline bool br_allowed_egress(struct net_bridge *br,
 669                                      const struct net_port_vlans *v,
 670                                      const struct sk_buff *skb)
 671 {
 672         return true;
 673 }
 674
 675 static inline bool br_should_learn(struct net_bridge_port *p,
 676                                    struct sk_buff *skb, u16 *vid)
 677 {
 678         return true;
 679 }
 680
 681 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 682                                              const struct net_port_vlans *v,
 683                                              struct sk_buff *skb)
 684 {
 685         return skb;
 686 }
 687
 688 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 689 {
 690         return -EOPNOTSUPP;
 691 }
 692
 693 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 694 {
 695         return -EOPNOTSUPP;
 696 }
 697
 698 static inline void br_vlan_flush(struct net_bridge *br)
 699 {
 700 }
 701
 702 static inline bool br_vlan_find(struct net_bridge *br, u16 vid)
 703 {
 704         return false;
 705 }
 706
 707 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 708 {
 709 }
 710
 711 static inline int br_vlan_init(struct net_bridge *br)
 712 {
 713         return 0;
 714 }
 715
 716 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 717 {
 718         return -EOPNOTSUPP;
 719 }
 720
 721 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 722 {
 723         return -EOPNOTSUPP;
 724 }
 725
 726 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 727 {
 728 }
 729
 730 static inline struct net_port_vlans *br_get_vlan_info(
 731                                                 const struct net_bridge *br)
 732 {
 733         return NULL;
 734 }
 735 static inline struct net_port_vlans *nbp_get_vlan_info(
 736                                                 const struct net_bridge_port *p)
 737 {
 738         return NULL;
 739 }
 740
 741 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 742 {
 743         return false;
 744 }
 745
 746 static inline int nbp_vlan_init(struct net_bridge_port *port)
 747 {
 748         return 0;
 749 }
 750
 751 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 752 {
 753         return 0;
 754 }
 755 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 756 {
 757         return 0;
 758 }
 759
 760 static inline int br_vlan_enabled(struct net_bridge *br)
 761 {
 762         return 0;
 763 }
 764 #endif
 765
 766 struct nf_br_ops {
 767         int (*br_dev_xmit_hook)(struct sk_buff *skb);
 768 };
 769 extern const struct nf_br_ops __rcu *nf_br_ops;
 770
 771 /* br_netfilter.c */
 772 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 773 int br_nf_core_init(void);
 774 void br_nf_core_fini(void);
 775 void br_netfilter_rtable_init(struct net_bridge *);
 776 #else
 777 static inline int br_nf_core_init(void) { return 0; }
 778 static inline void br_nf_core_fini(void) {}
 779 #define br_netfilter_rtable_init(x)
 780 #endif
 781
 782 /* br_stp.c */
 783 void br_log_state(const struct net_bridge_port *p);
 784 void br_set_state(struct net_bridge_port *p, unsigned int state);
 785 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 786 void br_init_port(struct net_bridge_port *p);
 787 void br_become_designated_port(struct net_bridge_port *p);
 788
 789 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 790 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 791 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 792 int br_set_max_age(struct net_bridge *br, unsigned long x);
 793
 794
 795 /* br_stp_if.c */
 796 void br_stp_enable_bridge(struct net_bridge *br);
 797 void br_stp_disable_bridge(struct net_bridge *br);
 798 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 799 void br_stp_enable_port(struct net_bridge_port *p);
 800 void br_stp_disable_port(struct net_bridge_port *p);
 801 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 802 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 803 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 804 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 805 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 806 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 807
 808 /* br_stp_bpdu.c */
 809 struct stp_proto;
 810 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 811                 struct net_device *dev);
 812
 813 /* br_stp_timer.c */
 814 void br_stp_timer_init(struct net_bridge *br);
 815 void br_stp_port_timer_init(struct net_bridge_port *p);
 816 unsigned long br_timer_value(const struct timer_list *timer);
 817
 818 /* br.c */
 819 #if IS_ENABLED(CONFIG_ATM_LANE)
 820 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 821 #endif
 822
 823 /* br_netlink.c */
 824 extern struct rtnl_link_ops br_link_ops;
 825 int br_netlink_init(void);
 826 void br_netlink_fini(void);
 827 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 828 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 829 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 830 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 831                u32 filter_mask, int nlflags);
 832
 833 #ifdef CONFIG_SYSFS
 834 /* br_sysfs_if.c */
 835 extern const struct sysfs_ops brport_sysfs_ops;
 836 int br_sysfs_addif(struct net_bridge_port *p);
 837 int br_sysfs_renameif(struct net_bridge_port *p);
 838
 839 /* br_sysfs_br.c */
 840 int br_sysfs_addbr(struct net_device *dev);
 841 void br_sysfs_delbr(struct net_device *dev);
 842
 843 #else
 844
 845 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 846 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 847 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 848 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 849 #endif /* CONFIG_SYSFS */
 850
 851 #endif