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
  39 /* Path to usermode spanning tree program */
  40 #define BR_STP_PROG     "/sbin/bridge-stp"
  41
  42 typedef struct bridge_id bridge_id;
  43 typedef struct mac_addr mac_addr;
  44 typedef __u16 port_id;
  45
  46 struct bridge_id
  47 {
  48         unsigned char   prio[2];
  49         unsigned char   addr[ETH_ALEN];
  50 };
  51
  52 struct mac_addr
  53 {
  54         unsigned char   addr[ETH_ALEN];
  55 };
  56
  57 struct br_ip
  58 {
  59         union {
  60                 __be32  ip4;
  61 #if IS_ENABLED(CONFIG_IPV6)
  62                 struct in6_addr ip6;
  63 #endif
  64         } u;
  65         __be16          proto;
  66         __u16           vid;
  67 };
  68
  69 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  70 /* our own querier */
  71 struct bridge_mcast_query {
  72         struct timer_list       timer;
  73         u32                     startup_sent;
  74 };
  75
  76 /* other querier */
  77 struct bridge_mcast_querier {
  78         struct timer_list               timer;
  79         unsigned long                   delay_time;
  80 };
  81 #endif
  82
  83 struct net_port_vlans {
  84         u16                             port_idx;
  85         u16                             pvid;
  86         union {
  87                 struct net_bridge_port          *port;
  88                 struct net_bridge               *br;
  89         }                               parent;
  90         struct rcu_head                 rcu;
  91         unsigned long                   vlan_bitmap[BR_VLAN_BITMAP_LEN];
  92         unsigned long                   untagged_bitmap[BR_VLAN_BITMAP_LEN];
  93         u16                             num_vlans;
  94 };
  95
  96 struct net_bridge_fdb_entry
  97 {
  98         struct hlist_node               hlist;
  99         struct net_bridge_port          *dst;
 100
 101         struct rcu_head                 rcu;
 102         unsigned long                   updated;
 103         unsigned long                   used;
 104         mac_addr                        addr;
 105         unsigned char                   is_local;
 106         unsigned char                   is_static;
 107         unsigned char                   added_by_user;
 108         __u16                           vlan_id;
 109 };
 110
 111 struct net_bridge_port_group {
 112         struct net_bridge_port          *port;
 113         struct net_bridge_port_group __rcu *next;
 114         struct hlist_node               mglist;
 115         struct rcu_head                 rcu;
 116         struct timer_list               timer;
 117         struct br_ip                    addr;
 118         unsigned char                   state;
 119 };
 120
 121 struct net_bridge_mdb_entry
 122 {
 123         struct hlist_node               hlist[2];
 124         struct net_bridge               *br;
 125         struct net_bridge_port_group __rcu *ports;
 126         struct rcu_head                 rcu;
 127         struct timer_list               timer;
 128         struct br_ip                    addr;
 129         bool                            mglist;
 130 };
 131
 132 struct net_bridge_mdb_htable
 133 {
 134         struct hlist_head               *mhash;
 135         struct rcu_head                 rcu;
 136         struct net_bridge_mdb_htable    *old;
 137         u32                             size;
 138         u32                             max;
 139         u32                             secret;
 140         u32                             ver;
 141 };
 142
 143 struct net_bridge_port
 144 {
 145         struct net_bridge               *br;
 146         struct net_device               *dev;
 147         struct list_head                list;
 148
 149         /* STP */
 150         u8                              priority;
 151         u8                              state;
 152         u16                             port_no;
 153         unsigned char                   topology_change_ack;
 154         unsigned char                   config_pending;
 155         port_id                         port_id;
 156         port_id                         designated_port;
 157         bridge_id                       designated_root;
 158         bridge_id                       designated_bridge;
 159         u32                             path_cost;
 160         u32                             designated_cost;
 161         unsigned long                   designated_age;
 162
 163         struct timer_list               forward_delay_timer;
 164         struct timer_list               hold_timer;
 165         struct timer_list               message_age_timer;
 166         struct kobject                  kobj;
 167         struct rcu_head                 rcu;
 168
 169         unsigned long                   flags;
 170 #define BR_HAIRPIN_MODE         0x00000001
 171 #define BR_BPDU_GUARD           0x00000002
 172 #define BR_ROOT_BLOCK           0x00000004
 173 #define BR_MULTICAST_FAST_LEAVE 0x00000008
 174 #define BR_ADMIN_COST           0x00000010
 175 #define BR_LEARNING             0x00000020
 176 #define BR_FLOOD                0x00000040
 177
 178 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 179         struct bridge_mcast_query       ip4_query;
 180 #if IS_ENABLED(CONFIG_IPV6)
 181         struct bridge_mcast_query       ip6_query;
 182 #endif /* IS_ENABLED(CONFIG_IPV6) */
 183         unsigned char                   multicast_router;
 184         struct timer_list               multicast_router_timer;
 185         struct hlist_head               mglist;
 186         struct hlist_node               rlist;
 187 #endif
 188
 189 #ifdef CONFIG_SYSFS
 190         char                            sysfs_name[IFNAMSIZ];
 191 #endif
 192
 193 #ifdef CONFIG_NET_POLL_CONTROLLER
 194         struct netpoll                  *np;
 195 #endif
 196 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 197         struct net_port_vlans __rcu     *vlan_info;
 198 #endif
 199 };
 200
 201 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 202
 203 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 204 {
 205         return rcu_dereference(dev->rx_handler_data);
 206 }
 207
 208 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 209 {
 210         return br_port_exists(dev) ?
 211                 rtnl_dereference(dev->rx_handler_data) : NULL;
 212 }
 213
 214 struct net_bridge
 215 {
 216         spinlock_t                      lock;
 217         struct list_head                port_list;
 218         struct net_device               *dev;
 219
 220         struct pcpu_sw_netstats         __percpu *stats;
 221         spinlock_t                      hash_lock;
 222         struct hlist_head               hash[BR_HASH_SIZE];
 223 #ifdef CONFIG_BRIDGE_NETFILTER
 224         struct rtable                   fake_rtable;
 225         bool                            nf_call_iptables;
 226         bool                            nf_call_ip6tables;
 227         bool                            nf_call_arptables;
 228 #endif
 229         u16                             group_fwd_mask;
 230
 231         /* STP */
 232         bridge_id                       designated_root;
 233         bridge_id                       bridge_id;
 234         u32                             root_path_cost;
 235         unsigned long                   max_age;
 236         unsigned long                   hello_time;
 237         unsigned long                   forward_delay;
 238         unsigned long                   bridge_max_age;
 239         unsigned long                   ageing_time;
 240         unsigned long                   bridge_hello_time;
 241         unsigned long                   bridge_forward_delay;
 242
 243         u8                              group_addr[ETH_ALEN];
 244         u16                             root_port;
 245
 246         enum {
 247                 BR_NO_STP,              /* no spanning tree */
 248                 BR_KERNEL_STP,          /* old STP in kernel */
 249                 BR_USER_STP,            /* new RSTP in userspace */
 250         } stp_enabled;
 251
 252         unsigned char                   topology_change;
 253         unsigned char                   topology_change_detected;
 254
 255 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 256         unsigned char                   multicast_router;
 257
 258         u8                              multicast_disabled:1;
 259         u8                              multicast_querier:1;
 260         u8                              multicast_query_use_ifaddr:1;
 261
 262         u32                             hash_elasticity;
 263         u32                             hash_max;
 264
 265         u32                             multicast_last_member_count;
 266         u32                             multicast_startup_query_count;
 267
 268         unsigned long                   multicast_last_member_interval;
 269         unsigned long                   multicast_membership_interval;
 270         unsigned long                   multicast_querier_interval;
 271         unsigned long                   multicast_query_interval;
 272         unsigned long                   multicast_query_response_interval;
 273         unsigned long                   multicast_startup_query_interval;
 274
 275         spinlock_t                      multicast_lock;
 276         struct net_bridge_mdb_htable __rcu *mdb;
 277         struct hlist_head               router_list;
 278
 279         struct timer_list               multicast_router_timer;
 280         struct bridge_mcast_querier     ip4_querier;
 281         struct bridge_mcast_query       ip4_query;
 282 #if IS_ENABLED(CONFIG_IPV6)
 283         struct bridge_mcast_querier     ip6_querier;
 284         struct bridge_mcast_query       ip6_query;
 285 #endif /* IS_ENABLED(CONFIG_IPV6) */
 286 #endif
 287
 288         struct timer_list               hello_timer;
 289         struct timer_list               tcn_timer;
 290         struct timer_list               topology_change_timer;
 291         struct timer_list               gc_timer;
 292         struct kobject                  *ifobj;
 293 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 294         u8                              vlan_enabled;
 295         struct net_port_vlans __rcu     *vlan_info;
 296 #endif
 297 };
 298
 299 struct br_input_skb_cb {
 300         struct net_device *brdev;
 301 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 302         int igmp;
 303         int mrouters_only;
 304 #endif
 305 };
 306
 307 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 308
 309 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 310 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 311 #else
 312 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 313 #endif
 314
 315 #define br_printk(level, br, format, args...)   \
 316         printk(level "%s: " format, (br)->dev->name, ##args)
 317
 318 #define br_err(__br, format, args...)                   \
 319         br_printk(KERN_ERR, __br, format, ##args)
 320 #define br_warn(__br, format, args...)                  \
 321         br_printk(KERN_WARNING, __br, format, ##args)
 322 #define br_notice(__br, format, args...)                \
 323         br_printk(KERN_NOTICE, __br, format, ##args)
 324 #define br_info(__br, format, args...)                  \
 325         br_printk(KERN_INFO, __br, format, ##args)
 326
 327 #define br_debug(br, format, args...)                   \
 328         pr_debug("%s: " format,  (br)->dev->name, ##args)
 329
 330 extern struct notifier_block br_device_notifier;
 331
 332 /* called under bridge lock */
 333 static inline int br_is_root_bridge(const struct net_bridge *br)
 334 {
 335         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 336 }
 337
 338 /* br_device.c */
 339 void br_dev_setup(struct net_device *dev);
 340 void br_dev_delete(struct net_device *dev, struct list_head *list);
 341 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 342 #ifdef CONFIG_NET_POLL_CONTROLLER
 343 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 344                                        struct sk_buff *skb)
 345 {
 346         struct netpoll *np = p->np;
 347
 348         if (np)
 349                 netpoll_send_skb(np, skb);
 350 }
 351
 352 int br_netpoll_enable(struct net_bridge_port *p);
 353 void br_netpoll_disable(struct net_bridge_port *p);
 354 #else
 355 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 356                                        struct sk_buff *skb)
 357 {
 358 }
 359
 360 static inline int br_netpoll_enable(struct net_bridge_port *p)
 361 {
 362         return 0;
 363 }
 364
 365 static inline void br_netpoll_disable(struct net_bridge_port *p)
 366 {
 367 }
 368 #endif
 369
 370 /* br_fdb.c */
 371 int br_fdb_init(void);
 372 void br_fdb_fini(void);
 373 void br_fdb_flush(struct net_bridge *br);
 374 void br_fdb_find_delete_local(struct net_bridge *br,
 375                               const struct net_bridge_port *p,
 376                               const unsigned char *addr, u16 vid);
 377 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 378 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 379 void br_fdb_cleanup(unsigned long arg);
 380 void br_fdb_delete_by_port(struct net_bridge *br,
 381                            const struct net_bridge_port *p, int do_all);
 382 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 383                                           const unsigned char *addr, __u16 vid);
 384 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 385 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 386                    unsigned long off);
 387 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 388                   const unsigned char *addr, u16 vid);
 389 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 390                    const unsigned char *addr, u16 vid, bool added_by_user);
 391
 392 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 393                   struct net_device *dev, const unsigned char *addr);
 394 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 395                const unsigned char *addr, u16 nlh_flags);
 396 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 397                 struct net_device *dev, int idx);
 398
 399 /* br_forward.c */
 400 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 401 int br_dev_queue_push_xmit(struct sk_buff *skb);
 402 void br_forward(const struct net_bridge_port *to,
 403                 struct sk_buff *skb, struct sk_buff *skb0);
 404 int br_forward_finish(struct sk_buff *skb);
 405 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 406 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 407                       struct sk_buff *skb2, bool unicast);
 408
 409 /* br_if.c */
 410 void br_port_carrier_check(struct net_bridge_port *p);
 411 int br_add_bridge(struct net *net, const char *name);
 412 int br_del_bridge(struct net *net, const char *name);
 413 int br_add_if(struct net_bridge *br, struct net_device *dev);
 414 int br_del_if(struct net_bridge *br, struct net_device *dev);
 415 int br_min_mtu(const struct net_bridge *br);
 416 netdev_features_t br_features_recompute(struct net_bridge *br,
 417                                         netdev_features_t features);
 418
 419 /* br_input.c */
 420 int br_handle_frame_finish(struct sk_buff *skb);
 421 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 422
 423 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 424 {
 425         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 426 }
 427
 428 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 429 {
 430         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 431 }
 432
 433 /* br_ioctl.c */
 434 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 435 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 436                              void __user *arg);
 437
 438 /* br_multicast.c */
 439 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 440 extern unsigned int br_mdb_rehash_seq;
 441 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 442                      struct sk_buff *skb, u16 vid);
 443 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 444                                         struct sk_buff *skb, u16 vid);
 445 void br_multicast_add_port(struct net_bridge_port *port);
 446 void br_multicast_del_port(struct net_bridge_port *port);
 447 void br_multicast_enable_port(struct net_bridge_port *port);
 448 void br_multicast_disable_port(struct net_bridge_port *port);
 449 void br_multicast_init(struct net_bridge *br);
 450 void br_multicast_open(struct net_bridge *br);
 451 void br_multicast_stop(struct net_bridge *br);
 452 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 453                           struct sk_buff *skb);
 454 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 455                           struct sk_buff *skb, struct sk_buff *skb2);
 456 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 457 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 458 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 459 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 460 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 461 struct net_bridge_mdb_entry *
 462 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 463 struct net_bridge_mdb_entry *
 464 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 465                        struct br_ip *group);
 466 void br_multicast_free_pg(struct rcu_head *head);
 467 struct net_bridge_port_group *
 468 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 469                             struct net_bridge_port_group __rcu *next,
 470                             unsigned char state);
 471 void br_mdb_init(void);
 472 void br_mdb_uninit(void);
 473 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 474                    struct br_ip *group, int type);
 475
 476 #define mlock_dereference(X, br) \
 477         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 478
 479 static inline bool br_multicast_is_router(struct net_bridge *br)
 480 {
 481         return br->multicast_router == 2 ||
 482                (br->multicast_router == 1 &&
 483                 timer_pending(&br->multicast_router_timer));
 484 }
 485
 486 static inline bool
 487 __br_multicast_querier_exists(struct net_bridge *br,
 488                               struct bridge_mcast_querier *querier)
 489 {
 490         return time_is_before_jiffies(querier->delay_time) &&
 491                (br->multicast_querier || timer_pending(&querier->timer));
 492 }
 493
 494 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 495                                                struct ethhdr *eth)
 496 {
 497         switch (eth->h_proto) {
 498         case (htons(ETH_P_IP)):
 499                 return __br_multicast_querier_exists(br, &br->ip4_querier);
 500 #if IS_ENABLED(CONFIG_IPV6)
 501         case (htons(ETH_P_IPV6)):
 502                 return __br_multicast_querier_exists(br, &br->ip6_querier);
 503 #endif
 504         default:
 505                 return false;
 506         }
 507 }
 508 #else
 509 static inline int br_multicast_rcv(struct net_bridge *br,
 510                                    struct net_bridge_port *port,
 511                                    struct sk_buff *skb,
 512                                    u16 vid)
 513 {
 514         return 0;
 515 }
 516
 517 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 518                                                       struct sk_buff *skb, u16 vid)
 519 {
 520         return NULL;
 521 }
 522
 523 static inline void br_multicast_add_port(struct net_bridge_port *port)
 524 {
 525 }
 526
 527 static inline void br_multicast_del_port(struct net_bridge_port *port)
 528 {
 529 }
 530
 531 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 532 {
 533 }
 534
 535 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 536 {
 537 }
 538
 539 static inline void br_multicast_init(struct net_bridge *br)
 540 {
 541 }
 542
 543 static inline void br_multicast_open(struct net_bridge *br)
 544 {
 545 }
 546
 547 static inline void br_multicast_stop(struct net_bridge *br)
 548 {
 549 }
 550
 551 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 552                                         struct sk_buff *skb)
 553 {
 554 }
 555
 556 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 557                                         struct sk_buff *skb,
 558                                         struct sk_buff *skb2)
 559 {
 560 }
 561 static inline bool br_multicast_is_router(struct net_bridge *br)
 562 {
 563         return 0;
 564 }
 565 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 566                                                struct ethhdr *eth)
 567 {
 568         return false;
 569 }
 570 static inline void br_mdb_init(void)
 571 {
 572 }
 573 static inline void br_mdb_uninit(void)
 574 {
 575 }
 576 #endif
 577
 578 /* br_vlan.c */
 579 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 580 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 581                         struct sk_buff *skb, u16 *vid);
 582 bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
 583                        const struct sk_buff *skb);
 584 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 585 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 586                                const struct net_port_vlans *v,
 587                                struct sk_buff *skb);
 588 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 589 int br_vlan_delete(struct net_bridge *br, u16 vid);
 590 void br_vlan_flush(struct net_bridge *br);
 591 bool br_vlan_find(struct net_bridge *br, u16 vid);
 592 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 593 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 594 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 595 void nbp_vlan_flush(struct net_bridge_port *port);
 596 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 597
 598 static inline struct net_port_vlans *br_get_vlan_info(
 599                                                 const struct net_bridge *br)
 600 {
 601         return rcu_dereference_rtnl(br->vlan_info);
 602 }
 603
 604 static inline struct net_port_vlans *nbp_get_vlan_info(
 605                                                 const struct net_bridge_port *p)
 606 {
 607         return rcu_dereference_rtnl(p->vlan_info);
 608 }
 609
 610 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 611  * skb, the vlan tag will always be present if the frame was tagged.
 612  */
 613 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 614 {
 615         int err = 0;
 616
 617         if (vlan_tx_tag_present(skb))
 618                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 619         else {
 620                 *vid = 0;
 621                 err = -EINVAL;
 622         }
 623
 624         return err;
 625 }
 626
 627 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 628 {
 629         /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
 630          * vid wasn't set
 631          */
 632         smp_rmb();
 633         return v->pvid ?: VLAN_N_VID;
 634 }
 635
 636 #else
 637 static inline bool br_allowed_ingress(struct net_bridge *br,
 638                                       struct net_port_vlans *v,
 639                                       struct sk_buff *skb,
 640                                       u16 *vid)
 641 {
 642         return true;
 643 }
 644
 645 static inline bool br_allowed_egress(struct net_bridge *br,
 646                                      const struct net_port_vlans *v,
 647                                      const struct sk_buff *skb)
 648 {
 649         return true;
 650 }
 651
 652 static inline bool br_should_learn(struct net_bridge_port *p,
 653                                    struct sk_buff *skb, u16 *vid)
 654 {
 655         return true;
 656 }
 657
 658 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 659                                              const struct net_port_vlans *v,
 660                                              struct sk_buff *skb)
 661 {
 662         return skb;
 663 }
 664
 665 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 666 {
 667         return -EOPNOTSUPP;
 668 }
 669
 670 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 671 {
 672         return -EOPNOTSUPP;
 673 }
 674
 675 static inline void br_vlan_flush(struct net_bridge *br)
 676 {
 677 }
 678
 679 static inline bool br_vlan_find(struct net_bridge *br, u16 vid)
 680 {
 681         return false;
 682 }
 683
 684 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 685 {
 686         return -EOPNOTSUPP;
 687 }
 688
 689 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 690 {
 691         return -EOPNOTSUPP;
 692 }
 693
 694 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 695 {
 696 }
 697
 698 static inline struct net_port_vlans *br_get_vlan_info(
 699                                                 const struct net_bridge *br)
 700 {
 701         return NULL;
 702 }
 703 static inline struct net_port_vlans *nbp_get_vlan_info(
 704                                                 const struct net_bridge_port *p)
 705 {
 706         return NULL;
 707 }
 708
 709 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 710 {
 711         return false;
 712 }
 713
 714 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 715 {
 716         return 0;
 717 }
 718 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 719 {
 720         return VLAN_N_VID;      /* Returns invalid vid */
 721 }
 722 #endif
 723
 724 /* br_netfilter.c */
 725 #ifdef CONFIG_BRIDGE_NETFILTER
 726 int br_netfilter_init(void);
 727 void br_netfilter_fini(void);
 728 void br_netfilter_rtable_init(struct net_bridge *);
 729 #else
 730 #define br_netfilter_init()     (0)
 731 #define br_netfilter_fini()     do { } while (0)
 732 #define br_netfilter_rtable_init(x)
 733 #endif
 734
 735 /* br_stp.c */
 736 void br_log_state(const struct net_bridge_port *p);
 737 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 738 void br_init_port(struct net_bridge_port *p);
 739 void br_become_designated_port(struct net_bridge_port *p);
 740
 741 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 742 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 743 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 744 int br_set_max_age(struct net_bridge *br, unsigned long x);
 745
 746
 747 /* br_stp_if.c */
 748 void br_stp_enable_bridge(struct net_bridge *br);
 749 void br_stp_disable_bridge(struct net_bridge *br);
 750 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 751 void br_stp_enable_port(struct net_bridge_port *p);
 752 void br_stp_disable_port(struct net_bridge_port *p);
 753 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 754 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 755 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 756 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 757 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 758 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 759
 760 /* br_stp_bpdu.c */
 761 struct stp_proto;
 762 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 763                 struct net_device *dev);
 764
 765 /* br_stp_timer.c */
 766 void br_stp_timer_init(struct net_bridge *br);
 767 void br_stp_port_timer_init(struct net_bridge_port *p);
 768 unsigned long br_timer_value(const struct timer_list *timer);
 769
 770 /* br.c */
 771 #if IS_ENABLED(CONFIG_ATM_LANE)
 772 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 773 #endif
 774
 775 /* br_netlink.c */
 776 extern struct rtnl_link_ops br_link_ops;
 777 int br_netlink_init(void);
 778 void br_netlink_fini(void);
 779 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 780 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 781 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 782 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 783                u32 filter_mask);
 784
 785 #ifdef CONFIG_SYSFS
 786 /* br_sysfs_if.c */
 787 extern const struct sysfs_ops brport_sysfs_ops;
 788 int br_sysfs_addif(struct net_bridge_port *p);
 789 int br_sysfs_renameif(struct net_bridge_port *p);
 790
 791 /* br_sysfs_br.c */
 792 int br_sysfs_addbr(struct net_device *dev);
 793 void br_sysfs_delbr(struct net_device *dev);
 794
 795 #else
 796
 797 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 798 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 799 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 800 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 801 #endif /* CONFIG_SYSFS */
 802
 803 #endif