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 #include <linux/rhashtable.h>
  24
  25 #define BR_HASH_BITS 8
  26 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  27
  28 #define BR_HOLD_TIME (1*HZ)
  29
  30 #define BR_PORT_BITS    10
  31 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  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 /**
  81  * struct net_bridge_vlan - per-vlan entry
  82  *
  83  * @vnode: rhashtable member
  84  * @vid: VLAN id
  85  * @flags: bridge vlan flags
  86  * @br: if MASTER flag set, this points to a bridge struct
  87  * @port: if MASTER flag unset, this points to a port struct
  88  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
  89  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
  90  *          for this VLAN entry
  91  * @vlist: sorted list of VLAN entries
  92  * @rcu: used for entry destruction
  93  *
  94  * This structure is shared between the global per-VLAN entries contained in
  95  * the bridge rhashtable and the local per-port per-VLAN entries contained in
  96  * the port's rhashtable. The union entries should be interpreted depending on
  97  * the entry flags that are set.
  98  */
  99 struct net_bridge_vlan {
 100         struct rhash_head               vnode;
 101         u16                             vid;
 102         u16                             flags;
 103         union {
 104                 struct net_bridge       *br;
 105                 struct net_bridge_port  *port;
 106         };
 107         union {
 108                 atomic_t                refcnt;
 109                 struct net_bridge_vlan  *brvlan;
 110         };
 111         struct list_head                vlist;
 112
 113         struct rcu_head                 rcu;
 114 };
 115
 116 /**
 117  * struct net_bridge_vlan_group
 118  *
 119  * @vlan_hash: VLAN entry rhashtable
 120  * @vlan_list: sorted VLAN entry list
 121  * @num_vlans: number of total VLAN entries
 122  * @pvid: PVID VLAN id
 123  *
 124  * IMPORTANT: Be careful when checking if there're VLAN entries using list
 125  *            primitives because the bridge can have entries in its list which
 126  *            are just for global context but not for filtering, i.e. they have
 127  *            the master flag set but not the brentry flag. If you have to check
 128  *            if there're "real" entries in the bridge please test @num_vlans
 129  */
 130 struct net_bridge_vlan_group {
 131         struct rhashtable               vlan_hash;
 132         struct list_head                vlan_list;
 133         u16                             num_vlans;
 134         u16                             pvid;
 135 };
 136
 137 struct net_bridge_fdb_entry
 138 {
 139         struct hlist_node               hlist;
 140         struct net_bridge_port          *dst;
 141
 142         unsigned long                   updated;
 143         unsigned long                   used;
 144         mac_addr                        addr;
 145         __u16                           vlan_id;
 146         unsigned char                   is_local:1,
 147                                         is_static:1,
 148                                         added_by_user:1,
 149                                         added_by_external_learn:1;
 150         struct rcu_head                 rcu;
 151 };
 152
 153 struct net_bridge_port_group {
 154         struct net_bridge_port          *port;
 155         struct net_bridge_port_group __rcu *next;
 156         struct hlist_node               mglist;
 157         struct rcu_head                 rcu;
 158         struct timer_list               timer;
 159         struct br_ip                    addr;
 160         unsigned char                   state;
 161 };
 162
 163 struct net_bridge_mdb_entry
 164 {
 165         struct hlist_node               hlist[2];
 166         struct net_bridge               *br;
 167         struct net_bridge_port_group __rcu *ports;
 168         struct rcu_head                 rcu;
 169         struct timer_list               timer;
 170         struct br_ip                    addr;
 171         bool                            mglist;
 172 };
 173
 174 struct net_bridge_mdb_htable
 175 {
 176         struct hlist_head               *mhash;
 177         struct rcu_head                 rcu;
 178         struct net_bridge_mdb_htable    *old;
 179         u32                             size;
 180         u32                             max;
 181         u32                             secret;
 182         u32                             ver;
 183 };
 184
 185 struct net_bridge_port
 186 {
 187         struct net_bridge               *br;
 188         struct net_device               *dev;
 189         struct list_head                list;
 190
 191         /* STP */
 192         u8                              priority;
 193         u8                              state;
 194         u16                             port_no;
 195         unsigned char                   topology_change_ack;
 196         unsigned char                   config_pending;
 197         port_id                         port_id;
 198         port_id                         designated_port;
 199         bridge_id                       designated_root;
 200         bridge_id                       designated_bridge;
 201         u32                             path_cost;
 202         u32                             designated_cost;
 203         unsigned long                   designated_age;
 204
 205         struct timer_list               forward_delay_timer;
 206         struct timer_list               hold_timer;
 207         struct timer_list               message_age_timer;
 208         struct kobject                  kobj;
 209         struct rcu_head                 rcu;
 210
 211         unsigned long                   flags;
 212
 213 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 214         struct bridge_mcast_own_query   ip4_own_query;
 215 #if IS_ENABLED(CONFIG_IPV6)
 216         struct bridge_mcast_own_query   ip6_own_query;
 217 #endif /* IS_ENABLED(CONFIG_IPV6) */
 218         unsigned char                   multicast_router;
 219         struct timer_list               multicast_router_timer;
 220         struct hlist_head               mglist;
 221         struct hlist_node               rlist;
 222 #endif
 223
 224 #ifdef CONFIG_SYSFS
 225         char                            sysfs_name[IFNAMSIZ];
 226 #endif
 227
 228 #ifdef CONFIG_NET_POLL_CONTROLLER
 229         struct netpoll                  *np;
 230 #endif
 231 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 232         struct net_bridge_vlan_group    __rcu *vlgrp;
 233 #endif
 234 };
 235
 236 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 237 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 238
 239 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 240
 241 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 242 {
 243         return rcu_dereference(dev->rx_handler_data);
 244 }
 245
 246 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 247 {
 248         return br_port_exists(dev) ?
 249                 rtnl_dereference(dev->rx_handler_data) : NULL;
 250 }
 251
 252 struct net_bridge
 253 {
 254         spinlock_t                      lock;
 255         struct list_head                port_list;
 256         struct net_device               *dev;
 257
 258         struct pcpu_sw_netstats         __percpu *stats;
 259         spinlock_t                      hash_lock;
 260         struct hlist_head               hash[BR_HASH_SIZE];
 261 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 262         union {
 263                 struct rtable           fake_rtable;
 264                 struct rt6_info         fake_rt6_info;
 265         };
 266         bool                            nf_call_iptables;
 267         bool                            nf_call_ip6tables;
 268         bool                            nf_call_arptables;
 269 #endif
 270         u16                             group_fwd_mask;
 271         u16                             group_fwd_mask_required;
 272
 273         /* STP */
 274         bridge_id                       designated_root;
 275         bridge_id                       bridge_id;
 276         u32                             root_path_cost;
 277         unsigned long                   max_age;
 278         unsigned long                   hello_time;
 279         unsigned long                   forward_delay;
 280         unsigned long                   bridge_max_age;
 281         unsigned long                   ageing_time;
 282         unsigned long                   bridge_hello_time;
 283         unsigned long                   bridge_forward_delay;
 284
 285         u8                              group_addr[ETH_ALEN];
 286         bool                            group_addr_set;
 287         u16                             root_port;
 288
 289         enum {
 290                 BR_NO_STP,              /* no spanning tree */
 291                 BR_KERNEL_STP,          /* old STP in kernel */
 292                 BR_USER_STP,            /* new RSTP in userspace */
 293         } stp_enabled;
 294
 295         unsigned char                   topology_change;
 296         unsigned char                   topology_change_detected;
 297
 298 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 299         unsigned char                   multicast_router;
 300
 301         u8                              multicast_disabled:1;
 302         u8                              multicast_querier:1;
 303         u8                              multicast_query_use_ifaddr:1;
 304
 305         u32                             hash_elasticity;
 306         u32                             hash_max;
 307
 308         u32                             multicast_last_member_count;
 309         u32                             multicast_startup_query_count;
 310
 311         unsigned long                   multicast_last_member_interval;
 312         unsigned long                   multicast_membership_interval;
 313         unsigned long                   multicast_querier_interval;
 314         unsigned long                   multicast_query_interval;
 315         unsigned long                   multicast_query_response_interval;
 316         unsigned long                   multicast_startup_query_interval;
 317
 318         spinlock_t                      multicast_lock;
 319         struct net_bridge_mdb_htable __rcu *mdb;
 320         struct hlist_head               router_list;
 321
 322         struct timer_list               multicast_router_timer;
 323         struct bridge_mcast_other_query ip4_other_query;
 324         struct bridge_mcast_own_query   ip4_own_query;
 325         struct bridge_mcast_querier     ip4_querier;
 326 #if IS_ENABLED(CONFIG_IPV6)
 327         struct bridge_mcast_other_query ip6_other_query;
 328         struct bridge_mcast_own_query   ip6_own_query;
 329         struct bridge_mcast_querier     ip6_querier;
 330 #endif /* IS_ENABLED(CONFIG_IPV6) */
 331 #endif
 332
 333         struct timer_list               hello_timer;
 334         struct timer_list               tcn_timer;
 335         struct timer_list               topology_change_timer;
 336         struct timer_list               gc_timer;
 337         struct kobject                  *ifobj;
 338         u32                             auto_cnt;
 339 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 340         struct net_bridge_vlan_group    __rcu *vlgrp;
 341         u8                              vlan_enabled;
 342         __be16                          vlan_proto;
 343         u16                             default_pvid;
 344 #endif
 345 };
 346
 347 struct br_input_skb_cb {
 348         struct net_device *brdev;
 349
 350 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 351         int igmp;
 352         int mrouters_only;
 353 #endif
 354
 355         bool proxyarp_replied;
 356
 357 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 358         bool vlan_filtered;
 359 #endif
 360 };
 361
 362 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 363
 364 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 365 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 366 #else
 367 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 368 #endif
 369
 370 #define br_printk(level, br, format, args...)   \
 371         printk(level "%s: " format, (br)->dev->name, ##args)
 372
 373 #define br_err(__br, format, args...)                   \
 374         br_printk(KERN_ERR, __br, format, ##args)
 375 #define br_warn(__br, format, args...)                  \
 376         br_printk(KERN_WARNING, __br, format, ##args)
 377 #define br_notice(__br, format, args...)                \
 378         br_printk(KERN_NOTICE, __br, format, ##args)
 379 #define br_info(__br, format, args...)                  \
 380         br_printk(KERN_INFO, __br, format, ##args)
 381
 382 #define br_debug(br, format, args...)                   \
 383         pr_debug("%s: " format,  (br)->dev->name, ##args)
 384
 385 /* called under bridge lock */
 386 static inline int br_is_root_bridge(const struct net_bridge *br)
 387 {
 388         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 389 }
 390
 391 /* check if a VLAN entry is global */
 392 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 393 {
 394         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 395 }
 396
 397 /* check if a VLAN entry is used by the bridge */
 398 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 399 {
 400         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 401 }
 402
 403 /* check if we should use the vlan entry, returns false if it's only context */
 404 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 405 {
 406         if (br_vlan_is_master(v)) {
 407                 if (br_vlan_is_brentry(v))
 408                         return true;
 409                 else
 410                         return false;
 411         }
 412
 413         return true;
 414 }
 415
 416 /* br_device.c */
 417 void br_dev_setup(struct net_device *dev);
 418 void br_dev_delete(struct net_device *dev, struct list_head *list);
 419 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 420 #ifdef CONFIG_NET_POLL_CONTROLLER
 421 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 422                                        struct sk_buff *skb)
 423 {
 424         struct netpoll *np = p->np;
 425
 426         if (np)
 427                 netpoll_send_skb(np, skb);
 428 }
 429
 430 int br_netpoll_enable(struct net_bridge_port *p);
 431 void br_netpoll_disable(struct net_bridge_port *p);
 432 #else
 433 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 434                                        struct sk_buff *skb)
 435 {
 436 }
 437
 438 static inline int br_netpoll_enable(struct net_bridge_port *p)
 439 {
 440         return 0;
 441 }
 442
 443 static inline void br_netpoll_disable(struct net_bridge_port *p)
 444 {
 445 }
 446 #endif
 447
 448 /* br_fdb.c */
 449 int br_fdb_init(void);
 450 void br_fdb_fini(void);
 451 void br_fdb_flush(struct net_bridge *br);
 452 void br_fdb_find_delete_local(struct net_bridge *br,
 453                               const struct net_bridge_port *p,
 454                               const unsigned char *addr, u16 vid);
 455 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 456 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 457 void br_fdb_cleanup(unsigned long arg);
 458 void br_fdb_delete_by_port(struct net_bridge *br,
 459                            const struct net_bridge_port *p, u16 vid, int do_all);
 460 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 461                                           const unsigned char *addr, __u16 vid);
 462 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 463 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 464                    unsigned long off);
 465 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 466                   const unsigned char *addr, u16 vid);
 467 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 468                    const unsigned char *addr, u16 vid, bool added_by_user);
 469
 470 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 471                   struct net_device *dev, const unsigned char *addr, u16 vid);
 472 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 473                const unsigned char *addr, u16 vid, u16 nlh_flags);
 474 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 475                 struct net_device *dev, struct net_device *fdev, int idx);
 476 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 477 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 478 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 479                               const unsigned char *addr, u16 vid);
 480 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 481                               const unsigned char *addr, u16 vid);
 482
 483 /* br_forward.c */
 484 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 485 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 486 void br_forward(const struct net_bridge_port *to,
 487                 struct sk_buff *skb, struct sk_buff *skb0);
 488 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 489 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 490 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 491                       struct sk_buff *skb2, bool unicast);
 492
 493 /* br_if.c */
 494 void br_port_carrier_check(struct net_bridge_port *p);
 495 int br_add_bridge(struct net *net, const char *name);
 496 int br_del_bridge(struct net *net, const char *name);
 497 int br_add_if(struct net_bridge *br, struct net_device *dev);
 498 int br_del_if(struct net_bridge *br, struct net_device *dev);
 499 int br_min_mtu(const struct net_bridge *br);
 500 netdev_features_t br_features_recompute(struct net_bridge *br,
 501                                         netdev_features_t features);
 502 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 503 void br_manage_promisc(struct net_bridge *br);
 504
 505 /* br_input.c */
 506 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 507 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 508
 509 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 510 {
 511         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 512 }
 513
 514 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 515 {
 516         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 517 }
 518
 519 /* br_ioctl.c */
 520 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 521 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 522                              void __user *arg);
 523
 524 /* br_multicast.c */
 525 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 526 extern unsigned int br_mdb_rehash_seq;
 527 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 528                      struct sk_buff *skb, u16 vid);
 529 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 530                                         struct sk_buff *skb, u16 vid);
 531 void br_multicast_add_port(struct net_bridge_port *port);
 532 void br_multicast_del_port(struct net_bridge_port *port);
 533 void br_multicast_enable_port(struct net_bridge_port *port);
 534 void br_multicast_disable_port(struct net_bridge_port *port);
 535 void br_multicast_init(struct net_bridge *br);
 536 void br_multicast_open(struct net_bridge *br);
 537 void br_multicast_stop(struct net_bridge *br);
 538 void br_multicast_dev_del(struct net_bridge *br);
 539 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 540                           struct sk_buff *skb);
 541 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 542                           struct sk_buff *skb, struct sk_buff *skb2);
 543 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 544 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 545 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 546 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 547 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 548 struct net_bridge_mdb_entry *
 549 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 550 struct net_bridge_mdb_entry *
 551 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 552                        struct br_ip *group);
 553 void br_multicast_free_pg(struct rcu_head *head);
 554 struct net_bridge_port_group *
 555 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 556                             struct net_bridge_port_group __rcu *next,
 557                             unsigned char state);
 558 void br_mdb_init(void);
 559 void br_mdb_uninit(void);
 560 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 561                    struct br_ip *group, int type, u8 state);
 562 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 563                    int type);
 564
 565 #define mlock_dereference(X, br) \
 566         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 567
 568 static inline bool br_multicast_is_router(struct net_bridge *br)
 569 {
 570         return br->multicast_router == 2 ||
 571                (br->multicast_router == 1 &&
 572                 timer_pending(&br->multicast_router_timer));
 573 }
 574
 575 static inline bool
 576 __br_multicast_querier_exists(struct net_bridge *br,
 577                               struct bridge_mcast_other_query *querier)
 578 {
 579         return time_is_before_jiffies(querier->delay_time) &&
 580                (br->multicast_querier || timer_pending(&querier->timer));
 581 }
 582
 583 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 584                                                struct ethhdr *eth)
 585 {
 586         switch (eth->h_proto) {
 587         case (htons(ETH_P_IP)):
 588                 return __br_multicast_querier_exists(br, &br->ip4_other_query);
 589 #if IS_ENABLED(CONFIG_IPV6)
 590         case (htons(ETH_P_IPV6)):
 591                 return __br_multicast_querier_exists(br, &br->ip6_other_query);
 592 #endif
 593         default:
 594                 return false;
 595         }
 596 }
 597 #else
 598 static inline int br_multicast_rcv(struct net_bridge *br,
 599                                    struct net_bridge_port *port,
 600                                    struct sk_buff *skb,
 601                                    u16 vid)
 602 {
 603         return 0;
 604 }
 605
 606 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 607                                                       struct sk_buff *skb, u16 vid)
 608 {
 609         return NULL;
 610 }
 611
 612 static inline void br_multicast_add_port(struct net_bridge_port *port)
 613 {
 614 }
 615
 616 static inline void br_multicast_del_port(struct net_bridge_port *port)
 617 {
 618 }
 619
 620 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 621 {
 622 }
 623
 624 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 625 {
 626 }
 627
 628 static inline void br_multicast_init(struct net_bridge *br)
 629 {
 630 }
 631
 632 static inline void br_multicast_open(struct net_bridge *br)
 633 {
 634 }
 635
 636 static inline void br_multicast_stop(struct net_bridge *br)
 637 {
 638 }
 639
 640 static inline void br_multicast_dev_del(struct net_bridge *br)
 641 {
 642 }
 643
 644 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 645                                         struct sk_buff *skb)
 646 {
 647 }
 648
 649 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 650                                         struct sk_buff *skb,
 651                                         struct sk_buff *skb2)
 652 {
 653 }
 654 static inline bool br_multicast_is_router(struct net_bridge *br)
 655 {
 656         return 0;
 657 }
 658 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 659                                                struct ethhdr *eth)
 660 {
 661         return false;
 662 }
 663 static inline void br_mdb_init(void)
 664 {
 665 }
 666 static inline void br_mdb_uninit(void)
 667 {
 668 }
 669 #endif
 670
 671 /* br_vlan.c */
 672 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 673 bool br_allowed_ingress(const struct net_bridge *br,
 674                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 675                         u16 *vid);
 676 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 677                        const struct sk_buff *skb);
 678 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 679 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 680                                struct net_bridge_vlan_group *vg,
 681                                struct sk_buff *skb);
 682 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 683 int br_vlan_delete(struct net_bridge *br, u16 vid);
 684 void br_vlan_flush(struct net_bridge *br);
 685 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 686 void br_recalculate_fwd_mask(struct net_bridge *br);
 687 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 688 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 689 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 690 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 691 int br_vlan_init(struct net_bridge *br);
 692 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 693 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
 694 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 695 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 696 void nbp_vlan_flush(struct net_bridge_port *port);
 697 int nbp_vlan_init(struct net_bridge_port *port);
 698 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 699
 700 static inline struct net_bridge_vlan_group *br_vlan_group(
 701                                         const struct net_bridge *br)
 702 {
 703         return rtnl_dereference(br->vlgrp);
 704 }
 705
 706 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 707                                         const struct net_bridge_port *p)
 708 {
 709         return rtnl_dereference(p->vlgrp);
 710 }
 711
 712 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 713                                         const struct net_bridge *br)
 714 {
 715         return rcu_dereference(br->vlgrp);
 716 }
 717
 718 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 719                                         const struct net_bridge_port *p)
 720 {
 721         return rcu_dereference(p->vlgrp);
 722 }
 723
 724 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 725  * skb, the vlan tag will always be present if the frame was tagged.
 726  */
 727 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 728 {
 729         int err = 0;
 730
 731         if (skb_vlan_tag_present(skb)) {
 732                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 733         } else {
 734                 *vid = 0;
 735                 err = -EINVAL;
 736         }
 737
 738         return err;
 739 }
 740
 741 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 742 {
 743         if (!vg)
 744                 return 0;
 745
 746         smp_rmb();
 747         return vg->pvid;
 748 }
 749
 750 static inline int br_vlan_enabled(struct net_bridge *br)
 751 {
 752         return br->vlan_enabled;
 753 }
 754 #else
 755 static inline bool br_allowed_ingress(const struct net_bridge *br,
 756                                       struct net_bridge_vlan_group *vg,
 757                                       struct sk_buff *skb,
 758                                       u16 *vid)
 759 {
 760         return true;
 761 }
 762
 763 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 764                                      const struct sk_buff *skb)
 765 {
 766         return true;
 767 }
 768
 769 static inline bool br_should_learn(struct net_bridge_port *p,
 770                                    struct sk_buff *skb, u16 *vid)
 771 {
 772         return true;
 773 }
 774
 775 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 776                                              struct net_bridge_vlan_group *vg,
 777                                              struct sk_buff *skb)
 778 {
 779         return skb;
 780 }
 781
 782 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 783 {
 784         return -EOPNOTSUPP;
 785 }
 786
 787 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 788 {
 789         return -EOPNOTSUPP;
 790 }
 791
 792 static inline void br_vlan_flush(struct net_bridge *br)
 793 {
 794 }
 795
 796 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 797 {
 798 }
 799
 800 static inline int br_vlan_init(struct net_bridge *br)
 801 {
 802         return 0;
 803 }
 804
 805 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 806 {
 807         return -EOPNOTSUPP;
 808 }
 809
 810 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 811 {
 812         return -EOPNOTSUPP;
 813 }
 814
 815 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 816 {
 817 }
 818
 819 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
 820                                                    u16 vid)
 821 {
 822         return NULL;
 823 }
 824
 825 static inline int nbp_vlan_init(struct net_bridge_port *port)
 826 {
 827         return 0;
 828 }
 829
 830 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 831 {
 832         return 0;
 833 }
 834
 835 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 836 {
 837         return 0;
 838 }
 839
 840 static inline int br_vlan_enabled(struct net_bridge *br)
 841 {
 842         return 0;
 843 }
 844
 845 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
 846                                           unsigned long val)
 847 {
 848         return -EOPNOTSUPP;
 849 }
 850
 851 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
 852                                          u32 filter_mask)
 853 {
 854         return 0;
 855 }
 856
 857 static inline struct net_bridge_vlan_group *br_vlan_group(
 858                                         const struct net_bridge *br)
 859 {
 860         return NULL;
 861 }
 862
 863 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 864                                         const struct net_bridge_port *p)
 865 {
 866         return NULL;
 867 }
 868
 869 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 870                                         const struct net_bridge *br)
 871 {
 872         return NULL;
 873 }
 874
 875 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 876                                         const struct net_bridge_port *p)
 877 {
 878         return NULL;
 879 }
 880
 881 #endif
 882
 883 struct nf_br_ops {
 884         int (*br_dev_xmit_hook)(struct sk_buff *skb);
 885 };
 886 extern const struct nf_br_ops __rcu *nf_br_ops;
 887
 888 /* br_netfilter.c */
 889 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 890 int br_nf_core_init(void);
 891 void br_nf_core_fini(void);
 892 void br_netfilter_rtable_init(struct net_bridge *);
 893 #else
 894 static inline int br_nf_core_init(void) { return 0; }
 895 static inline void br_nf_core_fini(void) {}
 896 #define br_netfilter_rtable_init(x)
 897 #endif
 898
 899 /* br_stp.c */
 900 void br_log_state(const struct net_bridge_port *p);
 901 void br_set_state(struct net_bridge_port *p, unsigned int state);
 902 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 903 void br_init_port(struct net_bridge_port *p);
 904 void br_become_designated_port(struct net_bridge_port *p);
 905
 906 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 907 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 908 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 909 int br_set_max_age(struct net_bridge *br, unsigned long x);
 910 int br_set_ageing_time(struct net_bridge *br, u32 ageing_time);
 911
 912
 913 /* br_stp_if.c */
 914 void br_stp_enable_bridge(struct net_bridge *br);
 915 void br_stp_disable_bridge(struct net_bridge *br);
 916 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 917 void br_stp_enable_port(struct net_bridge_port *p);
 918 void br_stp_disable_port(struct net_bridge_port *p);
 919 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 920 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 921 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 922 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 923 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 924 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 925
 926 /* br_stp_bpdu.c */
 927 struct stp_proto;
 928 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 929                 struct net_device *dev);
 930
 931 /* br_stp_timer.c */
 932 void br_stp_timer_init(struct net_bridge *br);
 933 void br_stp_port_timer_init(struct net_bridge_port *p);
 934 unsigned long br_timer_value(const struct timer_list *timer);
 935
 936 /* br.c */
 937 #if IS_ENABLED(CONFIG_ATM_LANE)
 938 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 939 #endif
 940
 941 /* br_netlink.c */
 942 extern struct rtnl_link_ops br_link_ops;
 943 int br_netlink_init(void);
 944 void br_netlink_fini(void);
 945 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 946 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 947 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 948 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 949                u32 filter_mask, int nlflags);
 950
 951 #ifdef CONFIG_SYSFS
 952 /* br_sysfs_if.c */
 953 extern const struct sysfs_ops brport_sysfs_ops;
 954 int br_sysfs_addif(struct net_bridge_port *p);
 955 int br_sysfs_renameif(struct net_bridge_port *p);
 956
 957 /* br_sysfs_br.c */
 958 int br_sysfs_addbr(struct net_device *dev);
 959 void br_sysfs_delbr(struct net_device *dev);
 960
 961 #else
 962
 963 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 964 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 965 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 966 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 967 #endif /* CONFIG_SYSFS */
 968
 969 #endif