Pileus Git - ~andy/linux/blob - 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[6];
  50 };
  51
  52 struct mac_addr
  53 {
  54         unsigned char   addr[6];
  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         __u16                           vlan_id;
 108 };
 109
 110 struct net_bridge_port_group {
 111         struct net_bridge_port          *port;
 112         struct net_bridge_port_group __rcu *next;
 113         struct hlist_node               mglist;
 114         struct rcu_head                 rcu;
 115         struct timer_list               timer;
 116         struct br_ip                    addr;
 117         unsigned char                   state;
 118 };
 119
 120 struct net_bridge_mdb_entry
 121 {
 122         struct hlist_node               hlist[2];
 123         struct net_bridge               *br;
 124         struct net_bridge_port_group __rcu *ports;
 125         struct rcu_head                 rcu;
 126         struct timer_list               timer;
 127         struct br_ip                    addr;
 128         bool                            mglist;
 129 };
 130
 131 struct net_bridge_mdb_htable
 132 {
 133         struct hlist_head               *mhash;
 134         struct rcu_head                 rcu;
 135         struct net_bridge_mdb_htable    *old;
 136         u32                             size;
 137         u32                             max;
 138         u32                             secret;
 139         u32                             ver;
 140 };
 141
 142 struct net_bridge_port
 143 {
 144         struct net_bridge               *br;
 145         struct net_device               *dev;
 146         struct list_head                list;
 147
 148         /* STP */
 149         u8                              priority;
 150         u8                              state;
 151         u16                             port_no;
 152         unsigned char                   topology_change_ack;
 153         unsigned char                   config_pending;
 154         port_id                         port_id;
 155         port_id                         designated_port;
 156         bridge_id                       designated_root;
 157         bridge_id                       designated_bridge;
 158         u32                             path_cost;
 159         u32                             designated_cost;
 160         unsigned long                   designated_age;
 161
 162         struct timer_list               forward_delay_timer;
 163         struct timer_list               hold_timer;
 164         struct timer_list               message_age_timer;
 165         struct kobject                  kobj;
 166         struct rcu_head                 rcu;
 167
 168         unsigned long                   flags;
 169 #define BR_HAIRPIN_MODE         0x00000001
 170 #define BR_BPDU_GUARD           0x00000002
 171 #define BR_ROOT_BLOCK           0x00000004
 172 #define BR_MULTICAST_FAST_LEAVE 0x00000008
 173 #define BR_ADMIN_COST           0x00000010
 174 #define BR_LEARNING             0x00000020
 175 #define BR_FLOOD                0x00000040
 176
 177 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 178         struct bridge_mcast_query       ip4_query;
 179 #if IS_ENABLED(CONFIG_IPV6)
 180         struct bridge_mcast_query       ip6_query;
 181 #endif /* IS_ENABLED(CONFIG_IPV6) */
 182         unsigned char                   multicast_router;
 183         struct timer_list               multicast_router_timer;
 184         struct hlist_head               mglist;
 185         struct hlist_node               rlist;
 186 #endif
 187
 188 #ifdef CONFIG_SYSFS
 189         char                            sysfs_name[IFNAMSIZ];
 190 #endif
 191
 192 #ifdef CONFIG_NET_POLL_CONTROLLER
 193         struct netpoll                  *np;
 194 #endif
 195 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 196         struct net_port_vlans __rcu     *vlan_info;
 197 #endif
 198 };
 199
 200 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 201
 202 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 203 {
 204         return rcu_dereference(dev->rx_handler_data);
 205 }
 206
 207 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 208 {
 209         return br_port_exists(dev) ?
 210                 rtnl_dereference(dev->rx_handler_data) : NULL;
 211 }
 212
 213 struct net_bridge
 214 {
 215         spinlock_t                      lock;
 216         struct list_head                port_list;
 217         struct net_device               *dev;
 218
 219         struct pcpu_sw_netstats         __percpu *stats;
 220         spinlock_t                      hash_lock;
 221         struct hlist_head               hash[BR_HASH_SIZE];
 222 #ifdef CONFIG_BRIDGE_NETFILTER
 223         struct rtable                   fake_rtable;
 224         bool                            nf_call_iptables;
 225         bool                            nf_call_ip6tables;
 226         bool                            nf_call_arptables;
 227 #endif
 228         u16                             group_fwd_mask;
 229
 230         /* STP */
 231         bridge_id                       designated_root;
 232         bridge_id                       bridge_id;
 233         u32                             root_path_cost;
 234         unsigned long                   max_age;
 235         unsigned long                   hello_time;
 236         unsigned long                   forward_delay;
 237         unsigned long                   bridge_max_age;
 238         unsigned long                   ageing_time;
 239         unsigned long                   bridge_hello_time;
 240         unsigned long                   bridge_forward_delay;
 241
 242         u8                              group_addr[ETH_ALEN];
 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_querier     ip4_querier;
 280         struct bridge_mcast_query       ip4_query;
 281 #if IS_ENABLED(CONFIG_IPV6)
 282         struct bridge_mcast_querier     ip6_querier;
 283         struct bridge_mcast_query       ip6_query;
 284 #endif /* IS_ENABLED(CONFIG_IPV6) */
 285 #endif
 286
 287         struct timer_list               hello_timer;
 288         struct timer_list               tcn_timer;
 289         struct timer_list               topology_change_timer;
 290         struct timer_list               gc_timer;
 291         struct kobject                  *ifobj;
 292 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 293         u8                              vlan_enabled;
 294         struct net_port_vlans __rcu     *vlan_info;
 295 #endif
 296 };
 297
 298 struct br_input_skb_cb {
 299         struct net_device *brdev;
 300 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 301         int igmp;
 302         int mrouters_only;
 303 #endif
 304 };
 305
 306 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 307
 308 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 309 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 310 #else
 311 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 312 #endif
 313
 314 #define br_printk(level, br, format, args...)   \
 315         printk(level "%s: " format, (br)->dev->name, ##args)
 316
 317 #define br_err(__br, format, args...)                   \
 318         br_printk(KERN_ERR, __br, format, ##args)
 319 #define br_warn(__br, format, args...)                  \
 320         br_printk(KERN_WARNING, __br, format, ##args)
 321 #define br_notice(__br, format, args...)                \
 322         br_printk(KERN_NOTICE, __br, format, ##args)
 323 #define br_info(__br, format, args...)                  \
 324         br_printk(KERN_INFO, __br, format, ##args)
 325
 326 #define br_debug(br, format, args...)                   \
 327         pr_debug("%s: " format,  (br)->dev->name, ##args)
 328
 329 extern struct notifier_block br_device_notifier;
 330
 331 /* called under bridge lock */
 332 static inline int br_is_root_bridge(const struct net_bridge *br)
 333 {
 334         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 335 }
 336
 337 /* br_device.c */
 338 void br_dev_setup(struct net_device *dev);
 339 void br_dev_delete(struct net_device *dev, struct list_head *list);
 340 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 341 #ifdef CONFIG_NET_POLL_CONTROLLER
 342 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 343                                        struct sk_buff *skb)
 344 {
 345         struct netpoll *np = p->np;
 346
 347         if (np)
 348                 netpoll_send_skb(np, skb);
 349 }
 350
 351 int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp);
 352 void br_netpoll_disable(struct net_bridge_port *p);
 353 #else
 354 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 355                                        struct sk_buff *skb)
 356 {
 357 }
 358
 359 static inline int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 360 {
 361         return 0;
 362 }
 363
 364 static inline void br_netpoll_disable(struct net_bridge_port *p)
 365 {
 366 }
 367 #endif
 368
 369 /* br_fdb.c */
 370 int br_fdb_init(void);
 371 void br_fdb_fini(void);
 372 void br_fdb_flush(struct net_bridge *br);
 373 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 374 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 375 void br_fdb_cleanup(unsigned long arg);
 376 void br_fdb_delete_by_port(struct net_bridge *br,
 377                            const struct net_bridge_port *p, int do_all);
 378 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 379                                           const unsigned char *addr, __u16 vid);
 380 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 381 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 382                    unsigned long off);
 383 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 384                   const unsigned char *addr, u16 vid);
 385 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 386                    const unsigned char *addr, u16 vid);
 387 int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, u16 vid);
 388
 389 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 390                   struct net_device *dev, const unsigned char *addr);
 391 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 392                const unsigned char *addr, u16 nlh_flags);
 393 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 394                 struct net_device *dev, int idx);
 395
 396 /* br_forward.c */
 397 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 398 int br_dev_queue_push_xmit(struct sk_buff *skb);
 399 void br_forward(const struct net_bridge_port *to,
 400                 struct sk_buff *skb, struct sk_buff *skb0);
 401 int br_forward_finish(struct sk_buff *skb);
 402 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 403 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 404                       struct sk_buff *skb2, bool unicast);
 405
 406 /* br_if.c */
 407 void br_port_carrier_check(struct net_bridge_port *p);
 408 int br_add_bridge(struct net *net, const char *name);
 409 int br_del_bridge(struct net *net, const char *name);
 410 int br_add_if(struct net_bridge *br, struct net_device *dev);
 411 int br_del_if(struct net_bridge *br, struct net_device *dev);
 412 int br_min_mtu(const struct net_bridge *br);
 413 netdev_features_t br_features_recompute(struct net_bridge *br,
 414                                         netdev_features_t features);
 415
 416 /* br_input.c */
 417 int br_handle_frame_finish(struct sk_buff *skb);
 418 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 419
 420 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 421 {
 422         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 423 }
 424
 425 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 426 {
 427         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 428 }
 429
 430 /* br_ioctl.c */
 431 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 432 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 433                              void __user *arg);
 434
 435 /* br_multicast.c */
 436 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 437 extern unsigned int br_mdb_rehash_seq;
 438 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 439                      struct sk_buff *skb, u16 vid);
 440 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 441                                         struct sk_buff *skb, u16 vid);
 442 void br_multicast_add_port(struct net_bridge_port *port);
 443 void br_multicast_del_port(struct net_bridge_port *port);
 444 void br_multicast_enable_port(struct net_bridge_port *port);
 445 void br_multicast_disable_port(struct net_bridge_port *port);
 446 void br_multicast_init(struct net_bridge *br);
 447 void br_multicast_open(struct net_bridge *br);
 448 void br_multicast_stop(struct net_bridge *br);
 449 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 450                           struct sk_buff *skb);
 451 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 452                           struct sk_buff *skb, struct sk_buff *skb2);
 453 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 454 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 455 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 456 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 457 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 458 struct net_bridge_mdb_entry *
 459 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 460 struct net_bridge_mdb_entry *
 461 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 462                        struct br_ip *group);
 463 void br_multicast_free_pg(struct rcu_head *head);
 464 struct net_bridge_port_group *
 465 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 466                             struct net_bridge_port_group __rcu *next,
 467                             unsigned char state);
 468 void br_mdb_init(void);
 469 void br_mdb_uninit(void);
 470 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 471                    struct br_ip *group, int type);
 472
 473 #define mlock_dereference(X, br) \
 474         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 475
 476 static inline bool br_multicast_is_router(struct net_bridge *br)
 477 {
 478         return br->multicast_router == 2 ||
 479                (br->multicast_router == 1 &&
 480                 timer_pending(&br->multicast_router_timer));
 481 }
 482
 483 static inline bool
 484 __br_multicast_querier_exists(struct net_bridge *br,
 485                               struct bridge_mcast_querier *querier)
 486 {
 487         return time_is_before_jiffies(querier->delay_time) &&
 488                (br->multicast_querier || timer_pending(&querier->timer));
 489 }
 490
 491 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 492                                                struct ethhdr *eth)
 493 {
 494         switch (eth->h_proto) {
 495         case (htons(ETH_P_IP)):
 496                 return __br_multicast_querier_exists(br, &br->ip4_querier);
 497 #if IS_ENABLED(CONFIG_IPV6)
 498         case (htons(ETH_P_IPV6)):
 499                 return __br_multicast_querier_exists(br, &br->ip6_querier);
 500 #endif
 501         default:
 502                 return false;
 503         }
 504 }
 505 #else
 506 static inline int br_multicast_rcv(struct net_bridge *br,
 507                                    struct net_bridge_port *port,
 508                                    struct sk_buff *skb,
 509                                    u16 vid)
 510 {
 511         return 0;
 512 }
 513
 514 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 515                                                       struct sk_buff *skb, u16 vid)
 516 {
 517         return NULL;
 518 }
 519
 520 static inline void br_multicast_add_port(struct net_bridge_port *port)
 521 {
 522 }
 523
 524 static inline void br_multicast_del_port(struct net_bridge_port *port)
 525 {
 526 }
 527
 528 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 529 {
 530 }
 531
 532 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 533 {
 534 }
 535
 536 static inline void br_multicast_init(struct net_bridge *br)
 537 {
 538 }
 539
 540 static inline void br_multicast_open(struct net_bridge *br)
 541 {
 542 }
 543
 544 static inline void br_multicast_stop(struct net_bridge *br)
 545 {
 546 }
 547
 548 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 549                                         struct sk_buff *skb)
 550 {
 551 }
 552
 553 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 554                                         struct sk_buff *skb,
 555                                         struct sk_buff *skb2)
 556 {
 557 }
 558 static inline bool br_multicast_is_router(struct net_bridge *br)
 559 {
 560         return 0;
 561 }
 562 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 563                                                struct ethhdr *eth)
 564 {
 565         return false;
 566 }
 567 static inline void br_mdb_init(void)
 568 {
 569 }
 570 static inline void br_mdb_uninit(void)
 571 {
 572 }
 573 #endif
 574
 575 /* br_vlan.c */
 576 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 577 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 578                         struct sk_buff *skb, u16 *vid);
 579 bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
 580                        const struct sk_buff *skb);
 581 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 582                                const struct net_port_vlans *v,
 583                                struct sk_buff *skb);
 584 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 585 int br_vlan_delete(struct net_bridge *br, u16 vid);
 586 void br_vlan_flush(struct net_bridge *br);
 587 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 588 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 589 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 590 void nbp_vlan_flush(struct net_bridge_port *port);
 591 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 592
 593 static inline struct net_port_vlans *br_get_vlan_info(
 594                                                 const struct net_bridge *br)
 595 {
 596         return rcu_dereference_rtnl(br->vlan_info);
 597 }
 598
 599 static inline struct net_port_vlans *nbp_get_vlan_info(
 600                                                 const struct net_bridge_port *p)
 601 {
 602         return rcu_dereference_rtnl(p->vlan_info);
 603 }
 604
 605 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 606  * skb, the vlan tag will always be present if the frame was tagged.
 607  */
 608 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 609 {
 610         int err = 0;
 611
 612         if (vlan_tx_tag_present(skb))
 613                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 614         else {
 615                 *vid = 0;
 616                 err = -EINVAL;
 617         }
 618
 619         return err;
 620 }
 621
 622 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 623 {
 624         /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
 625          * vid wasn't set
 626          */
 627         smp_rmb();
 628         return v->pvid ?: VLAN_N_VID;
 629 }
 630
 631 #else
 632 static inline bool br_allowed_ingress(struct net_bridge *br,
 633                                       struct net_port_vlans *v,
 634                                       struct sk_buff *skb,
 635                                       u16 *vid)
 636 {
 637         return true;
 638 }
 639
 640 static inline bool br_allowed_egress(struct net_bridge *br,
 641                                      const struct net_port_vlans *v,
 642                                      const struct sk_buff *skb)
 643 {
 644         return true;
 645 }
 646
 647 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 648                                              const struct net_port_vlans *v,
 649                                              struct sk_buff *skb)
 650 {
 651         return skb;
 652 }
 653
 654 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 655 {
 656         return -EOPNOTSUPP;
 657 }
 658
 659 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 660 {
 661         return -EOPNOTSUPP;
 662 }
 663
 664 static inline void br_vlan_flush(struct net_bridge *br)
 665 {
 666 }
 667
 668 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 669 {
 670         return -EOPNOTSUPP;
 671 }
 672
 673 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 674 {
 675         return -EOPNOTSUPP;
 676 }
 677
 678 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 679 {
 680 }
 681
 682 static inline struct net_port_vlans *br_get_vlan_info(
 683                                                 const struct net_bridge *br)
 684 {
 685         return NULL;
 686 }
 687 static inline struct net_port_vlans *nbp_get_vlan_info(
 688                                                 const struct net_bridge_port *p)
 689 {
 690         return NULL;
 691 }
 692
 693 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 694 {
 695         return false;
 696 }
 697
 698 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 699 {
 700         return 0;
 701 }
 702 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 703 {
 704         return VLAN_N_VID;      /* Returns invalid vid */
 705 }
 706 #endif
 707
 708 /* br_netfilter.c */
 709 #ifdef CONFIG_BRIDGE_NETFILTER
 710 int br_netfilter_init(void);
 711 void br_netfilter_fini(void);
 712 void br_netfilter_rtable_init(struct net_bridge *);
 713 #else
 714 #define br_netfilter_init()     (0)
 715 #define br_netfilter_fini()     do { } while (0)
 716 #define br_netfilter_rtable_init(x)
 717 #endif
 718
 719 /* br_stp.c */
 720 void br_log_state(const struct net_bridge_port *p);
 721 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 722 void br_init_port(struct net_bridge_port *p);
 723 void br_become_designated_port(struct net_bridge_port *p);
 724
 725 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 726 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 727 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 728 int br_set_max_age(struct net_bridge *br, unsigned long x);
 729
 730
 731 /* br_stp_if.c */
 732 void br_stp_enable_bridge(struct net_bridge *br);
 733 void br_stp_disable_bridge(struct net_bridge *br);
 734 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 735 void br_stp_enable_port(struct net_bridge_port *p);
 736 void br_stp_disable_port(struct net_bridge_port *p);
 737 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 738 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 739 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 740 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 741 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 742 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 743
 744 /* br_stp_bpdu.c */
 745 struct stp_proto;
 746 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 747                 struct net_device *dev);
 748
 749 /* br_stp_timer.c */
 750 void br_stp_timer_init(struct net_bridge *br);
 751 void br_stp_port_timer_init(struct net_bridge_port *p);
 752 unsigned long br_timer_value(const struct timer_list *timer);
 753
 754 /* br.c */
 755 #if IS_ENABLED(CONFIG_ATM_LANE)
 756 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 757 #endif
 758
 759 /* br_netlink.c */
 760 extern struct rtnl_link_ops br_link_ops;
 761 int br_netlink_init(void);
 762 void br_netlink_fini(void);
 763 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 764 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 765 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 766 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 767                u32 filter_mask);
 768
 769 #ifdef CONFIG_SYSFS
 770 /* br_sysfs_if.c */
 771 extern const struct sysfs_ops brport_sysfs_ops;
 772 int br_sysfs_addif(struct net_bridge_port *p);
 773 int br_sysfs_renameif(struct net_bridge_port *p);
 774
 775 /* br_sysfs_br.c */
 776 int br_sysfs_addbr(struct net_device *dev);
 777 void br_sysfs_delbr(struct net_device *dev);
 778
 779 #else
 780
 781 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 782 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 783 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 784 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 785 #endif /* CONFIG_SYSFS */
 786
 787 #endif