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