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 br_cpu_netstats {
 214         u64                     rx_packets;
 215         u64                     rx_bytes;
 216         u64                     tx_packets;
 217         u64                     tx_bytes;
 218         struct u64_stats_sync   syncp;
 219 };
 220
 221 struct net_bridge
 222 {
 223         spinlock_t                      lock;
 224         struct list_head                port_list;
 225         struct net_device               *dev;
 226
 227         struct br_cpu_netstats __percpu *stats;
 228         spinlock_t                      hash_lock;
 229         struct hlist_head               hash[BR_HASH_SIZE];
 230 #ifdef CONFIG_BRIDGE_NETFILTER
 231         struct rtable                   fake_rtable;
 232         bool                            nf_call_iptables;
 233         bool                            nf_call_ip6tables;
 234         bool                            nf_call_arptables;
 235 #endif
 236         u16                             group_fwd_mask;
 237
 238         /* STP */
 239         bridge_id                       designated_root;
 240         bridge_id                       bridge_id;
 241         u32                             root_path_cost;
 242         unsigned long                   max_age;
 243         unsigned long                   hello_time;
 244         unsigned long                   forward_delay;
 245         unsigned long                   bridge_max_age;
 246         unsigned long                   ageing_time;
 247         unsigned long                   bridge_hello_time;
 248         unsigned long                   bridge_forward_delay;
 249
 250         u8                              group_addr[ETH_ALEN];
 251         u16                             root_port;
 252
 253         enum {
 254                 BR_NO_STP,              /* no spanning tree */
 255                 BR_KERNEL_STP,          /* old STP in kernel */
 256                 BR_USER_STP,            /* new RSTP in userspace */
 257         } stp_enabled;
 258
 259         unsigned char                   topology_change;
 260         unsigned char                   topology_change_detected;
 261
 262 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 263         unsigned char                   multicast_router;
 264
 265         u8                              multicast_disabled:1;
 266         u8                              multicast_querier:1;
 267         u8                              multicast_query_use_ifaddr:1;
 268
 269         u32                             hash_elasticity;
 270         u32                             hash_max;
 271
 272         u32                             multicast_last_member_count;
 273         u32                             multicast_startup_query_count;
 274
 275         unsigned long                   multicast_last_member_interval;
 276         unsigned long                   multicast_membership_interval;
 277         unsigned long                   multicast_querier_interval;
 278         unsigned long                   multicast_query_interval;
 279         unsigned long                   multicast_query_response_interval;
 280         unsigned long                   multicast_startup_query_interval;
 281
 282         spinlock_t                      multicast_lock;
 283         struct net_bridge_mdb_htable __rcu *mdb;
 284         struct hlist_head               router_list;
 285
 286         struct timer_list               multicast_router_timer;
 287         struct bridge_mcast_querier     ip4_querier;
 288         struct bridge_mcast_query       ip4_query;
 289 #if IS_ENABLED(CONFIG_IPV6)
 290         struct bridge_mcast_querier     ip6_querier;
 291         struct bridge_mcast_query       ip6_query;
 292 #endif /* IS_ENABLED(CONFIG_IPV6) */
 293 #endif
 294
 295         struct timer_list               hello_timer;
 296         struct timer_list               tcn_timer;
 297         struct timer_list               topology_change_timer;
 298         struct timer_list               gc_timer;
 299         struct kobject                  *ifobj;
 300 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 301         u8                              vlan_enabled;
 302         struct net_port_vlans __rcu     *vlan_info;
 303 #endif
 304 };
 305
 306 struct br_input_skb_cb {
 307         struct net_device *brdev;
 308 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 309         int igmp;
 310         int mrouters_only;
 311 #endif
 312 };
 313
 314 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 315
 316 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 317 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 318 #else
 319 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 320 #endif
 321
 322 #define br_printk(level, br, format, args...)   \
 323         printk(level "%s: " format, (br)->dev->name, ##args)
 324
 325 #define br_err(__br, format, args...)                   \
 326         br_printk(KERN_ERR, __br, format, ##args)
 327 #define br_warn(__br, format, args...)                  \
 328         br_printk(KERN_WARNING, __br, format, ##args)
 329 #define br_notice(__br, format, args...)                \
 330         br_printk(KERN_NOTICE, __br, format, ##args)
 331 #define br_info(__br, format, args...)                  \
 332         br_printk(KERN_INFO, __br, format, ##args)
 333
 334 #define br_debug(br, format, args...)                   \
 335         pr_debug("%s: " format,  (br)->dev->name, ##args)
 336
 337 extern struct notifier_block br_device_notifier;
 338
 339 /* called under bridge lock */
 340 static inline int br_is_root_bridge(const struct net_bridge *br)
 341 {
 342         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 343 }
 344
 345 /* br_device.c */
 346 extern void br_dev_setup(struct net_device *dev);
 347 extern void br_dev_delete(struct net_device *dev, struct list_head *list);
 348 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
 349                                struct net_device *dev);
 350 #ifdef CONFIG_NET_POLL_CONTROLLER
 351 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 352                                        struct sk_buff *skb)
 353 {
 354         struct netpoll *np = p->np;
 355
 356         if (np)
 357                 netpoll_send_skb(np, skb);
 358 }
 359
 360 extern int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp);
 361 extern void br_netpoll_disable(struct net_bridge_port *p);
 362 #else
 363 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 364                                        struct sk_buff *skb)
 365 {
 366 }
 367
 368 static inline int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 369 {
 370         return 0;
 371 }
 372
 373 static inline void br_netpoll_disable(struct net_bridge_port *p)
 374 {
 375 }
 376 #endif
 377
 378 /* br_fdb.c */
 379 extern int br_fdb_init(void);
 380 extern void br_fdb_fini(void);
 381 extern void br_fdb_flush(struct net_bridge *br);
 382 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 383                               const unsigned char *newaddr);
 384 extern void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 385 extern void br_fdb_cleanup(unsigned long arg);
 386 extern void br_fdb_delete_by_port(struct net_bridge *br,
 387                                   const struct net_bridge_port *p, int do_all);
 388 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 389                                                  const unsigned char *addr,
 390                                                  __u16 vid);
 391 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 392 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 393                           unsigned long count, unsigned long off);
 394 extern int br_fdb_insert(struct net_bridge *br,
 395                          struct net_bridge_port *source,
 396                          const unsigned char *addr,
 397                          u16 vid);
 398 extern void br_fdb_update(struct net_bridge *br,
 399                           struct net_bridge_port *source,
 400                           const unsigned char *addr,
 401                           u16 vid);
 402 extern int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, u16 vid);
 403
 404 extern int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 405                          struct net_device *dev,
 406                          const unsigned char *addr);
 407 extern int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[],
 408                       struct net_device *dev,
 409                       const unsigned char *addr,
 410                       u16 nlh_flags);
 411 extern int br_fdb_dump(struct sk_buff *skb,
 412                        struct netlink_callback *cb,
 413                        struct net_device *dev,
 414                        int idx);
 415
 416 /* br_forward.c */
 417 extern void br_deliver(const struct net_bridge_port *to,
 418                 struct sk_buff *skb);
 419 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 420 extern void br_forward(const struct net_bridge_port *to,
 421                 struct sk_buff *skb, struct sk_buff *skb0);
 422 extern int br_forward_finish(struct sk_buff *skb);
 423 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb,
 424                              bool unicast);
 425 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 426                              struct sk_buff *skb2, bool unicast);
 427
 428 /* br_if.c */
 429 extern void br_port_carrier_check(struct net_bridge_port *p);
 430 extern int br_add_bridge(struct net *net, const char *name);
 431 extern int br_del_bridge(struct net *net, const char *name);
 432 extern void br_net_exit(struct net *net);
 433 extern int br_add_if(struct net_bridge *br,
 434               struct net_device *dev);
 435 extern int br_del_if(struct net_bridge *br,
 436               struct net_device *dev);
 437 extern int br_min_mtu(const struct net_bridge *br);
 438 extern netdev_features_t br_features_recompute(struct net_bridge *br,
 439         netdev_features_t features);
 440
 441 /* br_input.c */
 442 extern int br_handle_frame_finish(struct sk_buff *skb);
 443 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 444
 445 /* br_ioctl.c */
 446 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 447 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
 448
 449 /* br_multicast.c */
 450 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 451 extern unsigned int br_mdb_rehash_seq;
 452 extern int br_multicast_rcv(struct net_bridge *br,
 453                             struct net_bridge_port *port,
 454                             struct sk_buff *skb);
 455 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 456                                                struct sk_buff *skb, u16 vid);
 457 extern void br_multicast_add_port(struct net_bridge_port *port);
 458 extern void br_multicast_del_port(struct net_bridge_port *port);
 459 extern void br_multicast_enable_port(struct net_bridge_port *port);
 460 extern void br_multicast_disable_port(struct net_bridge_port *port);
 461 extern void br_multicast_init(struct net_bridge *br);
 462 extern void br_multicast_open(struct net_bridge *br);
 463 extern void br_multicast_stop(struct net_bridge *br);
 464 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 465                                  struct sk_buff *skb);
 466 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 467                                  struct sk_buff *skb, struct sk_buff *skb2);
 468 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 469 extern int br_multicast_set_port_router(struct net_bridge_port *p,
 470                                         unsigned long val);
 471 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 472 extern int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 473 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 474 extern struct net_bridge_mdb_entry *br_mdb_ip_get(
 475                                 struct net_bridge_mdb_htable *mdb,
 476                                 struct br_ip *dst);
 477 extern struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 478                                 struct net_bridge_port *port, struct br_ip *group);
 479 extern void br_multicast_free_pg(struct rcu_head *head);
 480 extern struct net_bridge_port_group *br_multicast_new_port_group(
 481                                 struct net_bridge_port *port,
 482                                 struct br_ip *group,
 483                                 struct net_bridge_port_group __rcu *next,
 484                                 unsigned char state);
 485 extern void br_mdb_init(void);
 486 extern void br_mdb_uninit(void);
 487 extern void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 488                           struct br_ip *group, int type);
 489
 490 #define mlock_dereference(X, br) \
 491         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 492
 493 static inline bool br_multicast_is_router(struct net_bridge *br)
 494 {
 495         return br->multicast_router == 2 ||
 496                (br->multicast_router == 1 &&
 497                 timer_pending(&br->multicast_router_timer));
 498 }
 499
 500 static inline bool
 501 __br_multicast_querier_exists(struct net_bridge *br,
 502                               struct bridge_mcast_querier *querier)
 503 {
 504         return time_is_before_jiffies(querier->delay_time) &&
 505                (br->multicast_querier || timer_pending(&querier->timer));
 506 }
 507
 508 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 509                                                struct ethhdr *eth)
 510 {
 511         switch (eth->h_proto) {
 512         case (htons(ETH_P_IP)):
 513                 return __br_multicast_querier_exists(br, &br->ip4_querier);
 514 #if IS_ENABLED(CONFIG_IPV6)
 515         case (htons(ETH_P_IPV6)):
 516                 return __br_multicast_querier_exists(br, &br->ip6_querier);
 517 #endif
 518         default:
 519                 return false;
 520         }
 521 }
 522 #else
 523 static inline int br_multicast_rcv(struct net_bridge *br,
 524                                    struct net_bridge_port *port,
 525                                    struct sk_buff *skb)
 526 {
 527         return 0;
 528 }
 529
 530 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 531                                                       struct sk_buff *skb, u16 vid)
 532 {
 533         return NULL;
 534 }
 535
 536 static inline void br_multicast_add_port(struct net_bridge_port *port)
 537 {
 538 }
 539
 540 static inline void br_multicast_del_port(struct net_bridge_port *port)
 541 {
 542 }
 543
 544 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 545 {
 546 }
 547
 548 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 549 {
 550 }
 551
 552 static inline void br_multicast_init(struct net_bridge *br)
 553 {
 554 }
 555
 556 static inline void br_multicast_open(struct net_bridge *br)
 557 {
 558 }
 559
 560 static inline void br_multicast_stop(struct net_bridge *br)
 561 {
 562 }
 563
 564 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 565                                         struct sk_buff *skb)
 566 {
 567 }
 568
 569 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 570                                         struct sk_buff *skb,
 571                                         struct sk_buff *skb2)
 572 {
 573 }
 574 static inline bool br_multicast_is_router(struct net_bridge *br)
 575 {
 576         return 0;
 577 }
 578 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 579                                                struct ethhdr *eth)
 580 {
 581         return false;
 582 }
 583 static inline void br_mdb_init(void)
 584 {
 585 }
 586 static inline void br_mdb_uninit(void)
 587 {
 588 }
 589 #endif
 590
 591 /* br_vlan.c */
 592 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 593 extern bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 594                                struct sk_buff *skb, u16 *vid);
 595 extern bool br_allowed_egress(struct net_bridge *br,
 596                               const struct net_port_vlans *v,
 597                               const struct sk_buff *skb);
 598 extern struct sk_buff *br_handle_vlan(struct net_bridge *br,
 599                                       const struct net_port_vlans *v,
 600                                       struct sk_buff *skb);
 601 extern int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 602 extern int br_vlan_delete(struct net_bridge *br, u16 vid);
 603 extern void br_vlan_flush(struct net_bridge *br);
 604 extern int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 605 extern int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 606 extern int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 607 extern void nbp_vlan_flush(struct net_bridge_port *port);
 608 extern bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 609
 610 static inline struct net_port_vlans *br_get_vlan_info(
 611                                                 const struct net_bridge *br)
 612 {
 613         return rcu_dereference_rtnl(br->vlan_info);
 614 }
 615
 616 static inline struct net_port_vlans *nbp_get_vlan_info(
 617                                                 const struct net_bridge_port *p)
 618 {
 619         return rcu_dereference_rtnl(p->vlan_info);
 620 }
 621
 622 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 623  * skb, the vlan tag will always be present if the frame was tagged.
 624  */
 625 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 626 {
 627         int err = 0;
 628
 629         if (vlan_tx_tag_present(skb))
 630                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 631         else {
 632                 *vid = 0;
 633                 err = -EINVAL;
 634         }
 635
 636         return err;
 637 }
 638
 639 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 640 {
 641         /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
 642          * vid wasn't set
 643          */
 644         smp_rmb();
 645         return v->pvid ?: VLAN_N_VID;
 646 }
 647
 648 #else
 649 static inline bool br_allowed_ingress(struct net_bridge *br,
 650                                       struct net_port_vlans *v,
 651                                       struct sk_buff *skb,
 652                                       u16 *vid)
 653 {
 654         return true;
 655 }
 656
 657 static inline bool br_allowed_egress(struct net_bridge *br,
 658                                      const struct net_port_vlans *v,
 659                                      const struct sk_buff *skb)
 660 {
 661         return true;
 662 }
 663
 664 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 665                                              const struct net_port_vlans *v,
 666                                              struct sk_buff *skb)
 667 {
 668         return skb;
 669 }
 670
 671 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 672 {
 673         return -EOPNOTSUPP;
 674 }
 675
 676 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 677 {
 678         return -EOPNOTSUPP;
 679 }
 680
 681 static inline void br_vlan_flush(struct net_bridge *br)
 682 {
 683 }
 684
 685 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 686 {
 687         return -EOPNOTSUPP;
 688 }
 689
 690 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 691 {
 692         return -EOPNOTSUPP;
 693 }
 694
 695 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 696 {
 697 }
 698
 699 static inline struct net_port_vlans *br_get_vlan_info(
 700                                                 const struct net_bridge *br)
 701 {
 702         return NULL;
 703 }
 704 static inline struct net_port_vlans *nbp_get_vlan_info(
 705                                                 const struct net_bridge_port *p)
 706 {
 707         return NULL;
 708 }
 709
 710 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 711 {
 712         return false;
 713 }
 714
 715 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 716 {
 717         return 0;
 718 }
 719 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 720 {
 721         return VLAN_N_VID;      /* Returns invalid vid */
 722 }
 723 #endif
 724
 725 /* br_netfilter.c */
 726 #ifdef CONFIG_BRIDGE_NETFILTER
 727 extern int br_netfilter_init(void);
 728 extern void br_netfilter_fini(void);
 729 extern void br_netfilter_rtable_init(struct net_bridge *);
 730 #else
 731 #define br_netfilter_init()     (0)
 732 #define br_netfilter_fini()     do { } while(0)
 733 #define br_netfilter_rtable_init(x)
 734 #endif
 735
 736 /* br_stp.c */
 737 extern void br_log_state(const struct net_bridge_port *p);
 738 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 739                                            u16 port_no);
 740 extern void br_init_port(struct net_bridge_port *p);
 741 extern void br_become_designated_port(struct net_bridge_port *p);
 742
 743 extern void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 744 extern int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 745 extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
 746 extern int br_set_max_age(struct net_bridge *br, unsigned long x);
 747
 748
 749 /* br_stp_if.c */
 750 extern void br_stp_enable_bridge(struct net_bridge *br);
 751 extern void br_stp_disable_bridge(struct net_bridge *br);
 752 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 753 extern void br_stp_enable_port(struct net_bridge_port *p);
 754 extern void br_stp_disable_port(struct net_bridge_port *p);
 755 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 756 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 757 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 758                                        u16 newprio);
 759 extern int br_stp_set_port_priority(struct net_bridge_port *p,
 760                                     unsigned long newprio);
 761 extern int br_stp_set_path_cost(struct net_bridge_port *p,
 762                                 unsigned long path_cost);
 763 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 764
 765 /* br_stp_bpdu.c */
 766 struct stp_proto;
 767 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 768                        struct net_device *dev);
 769
 770 /* br_stp_timer.c */
 771 extern void br_stp_timer_init(struct net_bridge *br);
 772 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 773 extern unsigned long br_timer_value(const struct timer_list *timer);
 774
 775 /* br.c */
 776 #if IS_ENABLED(CONFIG_ATM_LANE)
 777 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 778 #endif
 779
 780 /* br_netlink.c */
 781 extern struct rtnl_link_ops br_link_ops;
 782 extern int br_netlink_init(void);
 783 extern void br_netlink_fini(void);
 784 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
 785 extern int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 786 extern int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 787 extern int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 788                       struct net_device *dev, u32 filter_mask);
 789
 790 #ifdef CONFIG_SYSFS
 791 /* br_sysfs_if.c */
 792 extern const struct sysfs_ops brport_sysfs_ops;
 793 extern int br_sysfs_addif(struct net_bridge_port *p);
 794 extern int br_sysfs_renameif(struct net_bridge_port *p);
 795
 796 /* br_sysfs_br.c */
 797 extern int br_sysfs_addbr(struct net_device *dev);
 798 extern void br_sysfs_delbr(struct net_device *dev);
 799
 800 #else
 801
 802 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 803 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 804 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 805 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 806 #endif /* CONFIG_SYSFS */
 807
 808 #endif