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 <net/ip6_fib.h>
  22 #include <linux/if_vlan.h>
  23
  24 #define BR_HASH_BITS 8
  25 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  26
  27 #define BR_HOLD_TIME (1*HZ)
  28
  29 #define BR_PORT_BITS    10
  30 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  31 #define BR_VLAN_BITMAP_LEN      BITS_TO_LONGS(VLAN_N_VID)
  32
  33 #define BR_VERSION      "2.3"
  34
  35 /* Control of forwarding link local multicast */
  36 #define BR_GROUPFWD_DEFAULT     0
  37 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
  38 #define BR_GROUPFWD_RESTRICTED  0x0007u
  39 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
  40 #define BR_GROUPFWD_8021AD      0xB801u
  41
  42 /* Path to usermode spanning tree program */
  43 #define BR_STP_PROG     "/sbin/bridge-stp"
  44
  45 typedef struct bridge_id bridge_id;
  46 typedef struct mac_addr mac_addr;
  47 typedef __u16 port_id;
  48
  49 struct bridge_id
  50 {
  51         unsigned char   prio[2];
  52         unsigned char   addr[ETH_ALEN];
  53 };
  54
  55 struct mac_addr
  56 {
  57         unsigned char   addr[ETH_ALEN];
  58 };
  59
  60 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  61 /* our own querier */
  62 struct bridge_mcast_own_query {
  63         struct timer_list       timer;
  64         u32                     startup_sent;
  65 };
  66
  67 /* other querier */
  68 struct bridge_mcast_other_query {
  69         struct timer_list               timer;
  70         unsigned long                   delay_time;
  71 };
  72
  73 /* selected querier */
  74 struct bridge_mcast_querier {
  75         struct br_ip addr;
  76         struct net_bridge_port __rcu    *port;
  77 };
  78 #endif
  79
  80 struct net_port_vlans {
  81         u16                             port_idx;
  82         u16                             pvid;
  83         union {
  84                 struct net_bridge_port          *port;
  85                 struct net_bridge               *br;
  86         }                               parent;
  87         struct rcu_head                 rcu;
  88         unsigned long                   vlan_bitmap[BR_VLAN_BITMAP_LEN];
  89         unsigned long                   untagged_bitmap[BR_VLAN_BITMAP_LEN];
  90         u16                             num_vlans;
  91 };
  92
  93 struct net_bridge_fdb_entry
  94 {
  95         struct hlist_node               hlist;
  96         struct net_bridge_port          *dst;
  97
  98         struct rcu_head                 rcu;
  99         unsigned long                   updated;
 100         unsigned long                   used;
 101         mac_addr                        addr;
 102         unsigned char                   is_local:1,
 103                                         is_static:1,
 104                                         added_by_user:1,
 105                                         added_by_external_learn:1;
 106         __u16                           vlan_id;
 107 };
 108
 109 struct net_bridge_port_group {
 110         struct net_bridge_port          *port;
 111         struct net_bridge_port_group __rcu *next;
 112         struct hlist_node               mglist;
 113         struct rcu_head                 rcu;
 114         struct timer_list               timer;
 115         struct br_ip                    addr;
 116         unsigned char                   state;
 117 };
 118
 119 struct net_bridge_mdb_entry
 120 {
 121         struct hlist_node               hlist[2];
 122         struct net_bridge               *br;
 123         struct net_bridge_port_group __rcu *ports;
 124         struct rcu_head                 rcu;
 125         struct timer_list               timer;
 126         struct br_ip                    addr;
 127         bool                            mglist;
 128 };
 129
 130 struct net_bridge_mdb_htable
 131 {
 132         struct hlist_head               *mhash;
 133         struct rcu_head                 rcu;
 134         struct net_bridge_mdb_htable    *old;
 135         u32                             size;
 136         u32                             max;
 137         u32                             secret;
 138         u32                             ver;
 139 };
 140
 141 struct net_bridge_port
 142 {
 143         struct net_bridge               *br;
 144         struct net_device               *dev;
 145         struct list_head                list;
 146
 147         /* STP */
 148         u8                              priority;
 149         u8                              state;
 150         u16                             port_no;
 151         unsigned char                   topology_change_ack;
 152         unsigned char                   config_pending;
 153         port_id                         port_id;
 154         port_id                         designated_port;
 155         bridge_id                       designated_root;
 156         bridge_id                       designated_bridge;
 157         u32                             path_cost;
 158         u32                             designated_cost;
 159         unsigned long                   designated_age;
 160
 161         struct timer_list               forward_delay_timer;
 162         struct timer_list               hold_timer;
 163         struct timer_list               message_age_timer;
 164         struct kobject                  kobj;
 165         struct rcu_head                 rcu;
 166
 167         unsigned long                   flags;
 168
 169 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 170         struct bridge_mcast_own_query   ip4_own_query;
 171 #if IS_ENABLED(CONFIG_IPV6)
 172         struct bridge_mcast_own_query   ip6_own_query;
 173 #endif /* IS_ENABLED(CONFIG_IPV6) */
 174         unsigned char                   multicast_router;
 175         struct timer_list               multicast_router_timer;
 176         struct hlist_head               mglist;
 177         struct hlist_node               rlist;
 178 #endif
 179
 180 #ifdef CONFIG_SYSFS
 181         char                            sysfs_name[IFNAMSIZ];
 182 #endif
 183
 184 #ifdef CONFIG_NET_POLL_CONTROLLER
 185         struct netpoll                  *np;
 186 #endif
 187 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 188         struct net_port_vlans __rcu     *vlan_info;
 189 #endif
 190 };
 191
 192 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 193 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 194
 195 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 196
 197 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 198 {
 199         return rcu_dereference(dev->rx_handler_data);
 200 }
 201
 202 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 203 {
 204         return br_port_exists(dev) ?
 205                 rtnl_dereference(dev->rx_handler_data) : NULL;
 206 }
 207
 208 struct net_bridge
 209 {
 210         spinlock_t                      lock;
 211         struct list_head                port_list;
 212         struct net_device               *dev;
 213
 214         struct pcpu_sw_netstats         __percpu *stats;
 215         spinlock_t                      hash_lock;
 216         struct hlist_head               hash[BR_HASH_SIZE];
 217 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 218         union {
 219                 struct rtable           fake_rtable;
 220                 struct rt6_info         fake_rt6_info;
 221         };
 222         bool                            nf_call_iptables;
 223         bool                            nf_call_ip6tables;
 224         bool                            nf_call_arptables;
 225 #endif
 226         u16                             group_fwd_mask;
 227         u16                             group_fwd_mask_required;
 228
 229         /* STP */
 230         bridge_id                       designated_root;
 231         bridge_id                       bridge_id;
 232         u32                             root_path_cost;
 233         unsigned long                   max_age;
 234         unsigned long                   hello_time;
 235         unsigned long                   forward_delay;
 236         unsigned long                   bridge_max_age;
 237         unsigned long                   ageing_time;
 238         unsigned long                   bridge_hello_time;
 239         unsigned long                   bridge_forward_delay;
 240
 241         u8                              group_addr[ETH_ALEN];
 242         bool                            group_addr_set;
 243         u16                             root_port;
 244
 245         enum {
 246                 BR_NO_STP,              /* no spanning tree */
 247                 BR_KERNEL_STP,          /* old STP in kernel */
 248                 BR_USER_STP,            /* new RSTP in userspace */
 249         } stp_enabled;
 250
 251         unsigned char                   topology_change;
 252         unsigned char                   topology_change_detected;
 253
 254 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 255         unsigned char                   multicast_router;
 256
 257         u8                              multicast_disabled:1;
 258         u8                              multicast_querier:1;
 259         u8                              multicast_query_use_ifaddr:1;
 260
 261         u32                             hash_elasticity;
 262         u32                             hash_max;
 263
 264         u32                             multicast_last_member_count;
 265         u32                             multicast_startup_query_count;
 266
 267         unsigned long                   multicast_last_member_interval;
 268         unsigned long                   multicast_membership_interval;
 269         unsigned long                   multicast_querier_interval;
 270         unsigned long                   multicast_query_interval;
 271         unsigned long                   multicast_query_response_interval;
 272         unsigned long                   multicast_startup_query_interval;
 273
 274         spinlock_t                      multicast_lock;
 275         struct net_bridge_mdb_htable __rcu *mdb;
 276         struct hlist_head               router_list;
 277
 278         struct timer_list               multicast_router_timer;
 279         struct bridge_mcast_other_query ip4_other_query;
 280         struct bridge_mcast_own_query   ip4_own_query;
 281         struct bridge_mcast_querier     ip4_querier;
 282 #if IS_ENABLED(CONFIG_IPV6)
 283         struct bridge_mcast_other_query ip6_other_query;
 284         struct bridge_mcast_own_query   ip6_own_query;
 285         struct bridge_mcast_querier     ip6_querier;
 286 #endif /* IS_ENABLED(CONFIG_IPV6) */
 287 #endif
 288
 289         struct timer_list               hello_timer;
 290         struct timer_list               tcn_timer;
 291         struct timer_list               topology_change_timer;
 292         struct timer_list               gc_timer;
 293         struct kobject                  *ifobj;
 294         u32                             auto_cnt;
 295 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 296         u8                              vlan_enabled;
 297         __be16                          vlan_proto;
 298         u16                             default_pvid;
 299         struct net_port_vlans __rcu     *vlan_info;
 300 #endif
 301 };
 302
 303 struct br_input_skb_cb {
 304         struct net_device *brdev;
 305
 306 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 307         int igmp;
 308         int mrouters_only;
 309 #endif
 310
 311         bool proxyarp_replied;
 312
 313 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 314         bool vlan_filtered;
 315 #endif
 316 };
 317
 318 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 319
 320 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 321 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 322 #else
 323 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 324 #endif
 325
 326 #define br_printk(level, br, format, args...)   \
 327         printk(level "%s: " format, (br)->dev->name, ##args)
 328
 329 #define br_err(__br, format, args...)                   \
 330         br_printk(KERN_ERR, __br, format, ##args)
 331 #define br_warn(__br, format, args...)                  \
 332         br_printk(KERN_WARNING, __br, format, ##args)
 333 #define br_notice(__br, format, args...)                \
 334         br_printk(KERN_NOTICE, __br, format, ##args)
 335 #define br_info(__br, format, args...)                  \
 336         br_printk(KERN_INFO, __br, format, ##args)
 337
 338 #define br_debug(br, format, args...)                   \
 339         pr_debug("%s: " format,  (br)->dev->name, ##args)
 340
 341 /* called under bridge lock */
 342 static inline int br_is_root_bridge(const struct net_bridge *br)
 343 {
 344         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 345 }
 346
 347 /* br_device.c */
 348 void br_dev_setup(struct net_device *dev);
 349 void br_dev_delete(struct net_device *dev, struct list_head *list);
 350 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 351 #ifdef CONFIG_NET_POLL_CONTROLLER
 352 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 353                                        struct sk_buff *skb)
 354 {
 355         struct netpoll *np = p->np;
 356
 357         if (np)
 358                 netpoll_send_skb(np, skb);
 359 }
 360
 361 int br_netpoll_enable(struct net_bridge_port *p);
 362 void br_netpoll_disable(struct net_bridge_port *p);
 363 #else
 364 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 365                                        struct sk_buff *skb)
 366 {
 367 }
 368
 369 static inline int br_netpoll_enable(struct net_bridge_port *p)
 370 {
 371         return 0;
 372 }
 373
 374 static inline void br_netpoll_disable(struct net_bridge_port *p)
 375 {
 376 }
 377 #endif
 378
 379 /* br_fdb.c */
 380 int br_fdb_init(void);
 381 void br_fdb_fini(void);
 382 void br_fdb_flush(struct net_bridge *br);
 383 void br_fdb_find_delete_local(struct net_bridge *br,
 384                               const struct net_bridge_port *p,
 385                               const unsigned char *addr, u16 vid);
 386 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 387 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 388 void br_fdb_cleanup(unsigned long arg);
 389 void br_fdb_delete_by_port(struct net_bridge *br,
 390                            const struct net_bridge_port *p, u16 vid, int do_all);
 391 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 392                                           const unsigned char *addr, __u16 vid);
 393 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 394 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 395                    unsigned long off);
 396 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 397                   const unsigned char *addr, u16 vid);
 398 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 399                    const unsigned char *addr, u16 vid, bool added_by_user);
 400
 401 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 402                   struct net_device *dev, const unsigned char *addr, u16 vid);
 403 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 404                const unsigned char *addr, u16 vid, u16 nlh_flags);
 405 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 406                 struct net_device *dev, struct net_device *fdev, int idx);
 407 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 408 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 409 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 410                               const unsigned char *addr, u16 vid);
 411 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 412                               const unsigned char *addr, u16 vid);
 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 sock *sk, 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 sock *sk, 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 sock *sk, 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_dev_del(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, u8 state);
 493 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 494                    int type);
 495
 496 #define mlock_dereference(X, br) \
 497         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 498
 499 static inline bool br_multicast_is_router(struct net_bridge *br)
 500 {
 501         return br->multicast_router == 2 ||
 502                (br->multicast_router == 1 &&
 503                 timer_pending(&br->multicast_router_timer));
 504 }
 505
 506 static inline bool
 507 __br_multicast_querier_exists(struct net_bridge *br,
 508                               struct bridge_mcast_other_query *querier)
 509 {
 510         return time_is_before_jiffies(querier->delay_time) &&
 511                (br->multicast_querier || timer_pending(&querier->timer));
 512 }
 513
 514 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 515                                                struct ethhdr *eth)
 516 {
 517         switch (eth->h_proto) {
 518         case (htons(ETH_P_IP)):
 519                 return __br_multicast_querier_exists(br, &br->ip4_other_query);
 520 #if IS_ENABLED(CONFIG_IPV6)
 521         case (htons(ETH_P_IPV6)):
 522                 return __br_multicast_querier_exists(br, &br->ip6_other_query);
 523 #endif
 524         default:
 525                 return false;
 526         }
 527 }
 528 #else
 529 static inline int br_multicast_rcv(struct net_bridge *br,
 530                                    struct net_bridge_port *port,
 531                                    struct sk_buff *skb,
 532                                    u16 vid)
 533 {
 534         return 0;
 535 }
 536
 537 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 538                                                       struct sk_buff *skb, u16 vid)
 539 {
 540         return NULL;
 541 }
 542
 543 static inline void br_multicast_add_port(struct net_bridge_port *port)
 544 {
 545 }
 546
 547 static inline void br_multicast_del_port(struct net_bridge_port *port)
 548 {
 549 }
 550
 551 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 552 {
 553 }
 554
 555 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 556 {
 557 }
 558
 559 static inline void br_multicast_init(struct net_bridge *br)
 560 {
 561 }
 562
 563 static inline void br_multicast_open(struct net_bridge *br)
 564 {
 565 }
 566
 567 static inline void br_multicast_stop(struct net_bridge *br)
 568 {
 569 }
 570
 571 static inline void br_multicast_dev_del(struct net_bridge *br)
 572 {
 573 }
 574
 575 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 576                                         struct sk_buff *skb)
 577 {
 578 }
 579
 580 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 581                                         struct sk_buff *skb,
 582                                         struct sk_buff *skb2)
 583 {
 584 }
 585 static inline bool br_multicast_is_router(struct net_bridge *br)
 586 {
 587         return 0;
 588 }
 589 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 590                                                struct ethhdr *eth)
 591 {
 592         return false;
 593 }
 594 static inline void br_mdb_init(void)
 595 {
 596 }
 597 static inline void br_mdb_uninit(void)
 598 {
 599 }
 600 #endif
 601
 602 /* br_vlan.c */
 603 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 604 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 605                         struct sk_buff *skb, u16 *vid);
 606 bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
 607                        const struct sk_buff *skb);
 608 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 609 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 610                                const struct net_port_vlans *v,
 611                                struct sk_buff *skb);
 612 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 613 int br_vlan_delete(struct net_bridge *br, u16 vid);
 614 void br_vlan_flush(struct net_bridge *br);
 615 bool br_vlan_find(struct net_bridge *br, u16 vid);
 616 void br_recalculate_fwd_mask(struct net_bridge *br);
 617 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 618 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 619 int br_vlan_init(struct net_bridge *br);
 620 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 621 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 622 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 623 void nbp_vlan_flush(struct net_bridge_port *port);
 624 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 625 int nbp_vlan_init(struct net_bridge_port *port);
 626
 627 static inline struct net_port_vlans *br_get_vlan_info(
 628                                                 const struct net_bridge *br)
 629 {
 630         return rcu_dereference_rtnl(br->vlan_info);
 631 }
 632
 633 static inline struct net_port_vlans *nbp_get_vlan_info(
 634                                                 const struct net_bridge_port *p)
 635 {
 636         return rcu_dereference_rtnl(p->vlan_info);
 637 }
 638
 639 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 640  * skb, the vlan tag will always be present if the frame was tagged.
 641  */
 642 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 643 {
 644         int err = 0;
 645
 646         if (skb_vlan_tag_present(skb))
 647                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 648         else {
 649                 *vid = 0;
 650                 err = -EINVAL;
 651         }
 652
 653         return err;
 654 }
 655
 656 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 657 {
 658         if (!v)
 659                 return 0;
 660
 661         smp_rmb();
 662         return v->pvid;
 663 }
 664
 665 static inline int br_vlan_enabled(struct net_bridge *br)
 666 {
 667         return br->vlan_enabled;
 668 }
 669 #else
 670 static inline bool br_allowed_ingress(struct net_bridge *br,
 671                                       struct net_port_vlans *v,
 672                                       struct sk_buff *skb,
 673                                       u16 *vid)
 674 {
 675         return true;
 676 }
 677
 678 static inline bool br_allowed_egress(struct net_bridge *br,
 679                                      const struct net_port_vlans *v,
 680                                      const struct sk_buff *skb)
 681 {
 682         return true;
 683 }
 684
 685 static inline bool br_should_learn(struct net_bridge_port *p,
 686                                    struct sk_buff *skb, u16 *vid)
 687 {
 688         return true;
 689 }
 690
 691 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 692                                              const struct net_port_vlans *v,
 693                                              struct sk_buff *skb)
 694 {
 695         return skb;
 696 }
 697
 698 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 699 {
 700         return -EOPNOTSUPP;
 701 }
 702
 703 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 704 {
 705         return -EOPNOTSUPP;
 706 }
 707
 708 static inline void br_vlan_flush(struct net_bridge *br)
 709 {
 710 }
 711
 712 static inline bool br_vlan_find(struct net_bridge *br, u16 vid)
 713 {
 714         return false;
 715 }
 716
 717 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 718 {
 719 }
 720
 721 static inline int br_vlan_init(struct net_bridge *br)
 722 {
 723         return 0;
 724 }
 725
 726 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 727 {
 728         return -EOPNOTSUPP;
 729 }
 730
 731 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 732 {
 733         return -EOPNOTSUPP;
 734 }
 735
 736 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 737 {
 738 }
 739
 740 static inline struct net_port_vlans *br_get_vlan_info(
 741                                                 const struct net_bridge *br)
 742 {
 743         return NULL;
 744 }
 745 static inline struct net_port_vlans *nbp_get_vlan_info(
 746                                                 const struct net_bridge_port *p)
 747 {
 748         return NULL;
 749 }
 750
 751 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 752 {
 753         return false;
 754 }
 755
 756 static inline int nbp_vlan_init(struct net_bridge_port *port)
 757 {
 758         return 0;
 759 }
 760
 761 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 762 {
 763         return 0;
 764 }
 765 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 766 {
 767         return 0;
 768 }
 769
 770 static inline int br_vlan_enabled(struct net_bridge *br)
 771 {
 772         return 0;
 773 }
 774 #endif
 775
 776 struct nf_br_ops {
 777         int (*br_dev_xmit_hook)(struct sk_buff *skb);
 778 };
 779 extern const struct nf_br_ops __rcu *nf_br_ops;
 780
 781 /* br_netfilter.c */
 782 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 783 int br_nf_core_init(void);
 784 void br_nf_core_fini(void);
 785 void br_netfilter_rtable_init(struct net_bridge *);
 786 #else
 787 static inline int br_nf_core_init(void) { return 0; }
 788 static inline void br_nf_core_fini(void) {}
 789 #define br_netfilter_rtable_init(x)
 790 #endif
 791
 792 /* br_stp.c */
 793 void br_log_state(const struct net_bridge_port *p);
 794 void br_set_state(struct net_bridge_port *p, unsigned int state);
 795 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 796 void br_init_port(struct net_bridge_port *p);
 797 void br_become_designated_port(struct net_bridge_port *p);
 798
 799 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 800 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 801 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 802 int br_set_max_age(struct net_bridge *br, unsigned long x);
 803
 804
 805 /* br_stp_if.c */
 806 void br_stp_enable_bridge(struct net_bridge *br);
 807 void br_stp_disable_bridge(struct net_bridge *br);
 808 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 809 void br_stp_enable_port(struct net_bridge_port *p);
 810 void br_stp_disable_port(struct net_bridge_port *p);
 811 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 812 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 813 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 814 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 815 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 816 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 817
 818 /* br_stp_bpdu.c */
 819 struct stp_proto;
 820 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 821                 struct net_device *dev);
 822
 823 /* br_stp_timer.c */
 824 void br_stp_timer_init(struct net_bridge *br);
 825 void br_stp_port_timer_init(struct net_bridge_port *p);
 826 unsigned long br_timer_value(const struct timer_list *timer);
 827
 828 /* br.c */
 829 #if IS_ENABLED(CONFIG_ATM_LANE)
 830 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 831 #endif
 832
 833 /* br_netlink.c */
 834 extern struct rtnl_link_ops br_link_ops;
 835 int br_netlink_init(void);
 836 void br_netlink_fini(void);
 837 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 838 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 839 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 840 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 841                u32 filter_mask, int nlflags);
 842
 843 #ifdef CONFIG_SYSFS
 844 /* br_sysfs_if.c */
 845 extern const struct sysfs_ops brport_sysfs_ops;
 846 int br_sysfs_addif(struct net_bridge_port *p);
 847 int br_sysfs_renameif(struct net_bridge_port *p);
 848
 849 /* br_sysfs_br.c */
 850 int br_sysfs_addbr(struct net_device *dev);
 851 void br_sysfs_delbr(struct net_device *dev);
 852
 853 #else
 854
 855 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 856 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 857 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 858 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 859 #endif /* CONFIG_SYSFS */
 860
 861 #endif