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         unsigned char                   added_by_user;
 108         __u16                           vlan_id;
 109 };
 110
 111 struct net_bridge_port_group {
 112         struct net_bridge_port          *port;
 113         struct net_bridge_port_group __rcu *next;
 114         struct hlist_node               mglist;
 115         struct rcu_head                 rcu;
 116         struct timer_list               timer;
 117         struct br_ip                    addr;
 118         unsigned char                   state;
 119 };
 120
 121 struct net_bridge_mdb_entry
 122 {
 123         struct hlist_node               hlist[2];
 124         struct net_bridge               *br;
 125         struct net_bridge_port_group __rcu *ports;
 126         struct rcu_head                 rcu;
 127         struct timer_list               timer;
 128         struct br_ip                    addr;
 129         bool                            mglist;
 130 };
 131
 132 struct net_bridge_mdb_htable
 133 {
 134         struct hlist_head               *mhash;
 135         struct rcu_head                 rcu;
 136         struct net_bridge_mdb_htable    *old;
 137         u32                             size;
 138         u32                             max;
 139         u32                             secret;
 140         u32                             ver;
 141 };
 142
 143 struct net_bridge_port
 144 {
 145         struct net_bridge               *br;
 146         struct net_device               *dev;
 147         struct list_head                list;
 148
 149         /* STP */
 150         u8                              priority;
 151         u8                              state;
 152         u16                             port_no;
 153         unsigned char                   topology_change_ack;
 154         unsigned char                   config_pending;
 155         port_id                         port_id;
 156         port_id                         designated_port;
 157         bridge_id                       designated_root;
 158         bridge_id                       designated_bridge;
 159         u32                             path_cost;
 160         u32                             designated_cost;
 161         unsigned long                   designated_age;
 162
 163         struct timer_list               forward_delay_timer;
 164         struct timer_list               hold_timer;
 165         struct timer_list               message_age_timer;
 166         struct kobject                  kobj;
 167         struct rcu_head                 rcu;
 168
 169         unsigned long                   flags;
 170 #define BR_HAIRPIN_MODE         0x00000001
 171 #define BR_BPDU_GUARD           0x00000002
 172 #define BR_ROOT_BLOCK           0x00000004
 173 #define BR_MULTICAST_FAST_LEAVE 0x00000008
 174 #define BR_ADMIN_COST           0x00000010
 175 #define BR_LEARNING             0x00000020
 176 #define BR_FLOOD                0x00000040
 177
 178 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 179         struct bridge_mcast_query       ip4_query;
 180 #if IS_ENABLED(CONFIG_IPV6)
 181         struct bridge_mcast_query       ip6_query;
 182 #endif /* IS_ENABLED(CONFIG_IPV6) */
 183         unsigned char                   multicast_router;
 184         struct timer_list               multicast_router_timer;
 185         struct hlist_head               mglist;
 186         struct hlist_node               rlist;
 187 #endif
 188
 189 #ifdef CONFIG_SYSFS
 190         char                            sysfs_name[IFNAMSIZ];
 191 #endif
 192
 193 #ifdef CONFIG_NET_POLL_CONTROLLER
 194         struct netpoll                  *np;
 195 #endif
 196 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 197         struct net_port_vlans __rcu     *vlan_info;
 198 #endif
 199 };
 200
 201 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 202
 203 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 204 {
 205         return rcu_dereference(dev->rx_handler_data);
 206 }
 207
 208 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 209 {
 210         return br_port_exists(dev) ?
 211                 rtnl_dereference(dev->rx_handler_data) : NULL;
 212 }
 213
 214 struct net_bridge
 215 {
 216         spinlock_t                      lock;
 217         struct list_head                port_list;
 218         struct net_device               *dev;
 219
 220         struct pcpu_sw_netstats         __percpu *stats;
 221         spinlock_t                      hash_lock;
 222         struct hlist_head               hash[BR_HASH_SIZE];
 223 #ifdef CONFIG_BRIDGE_NETFILTER
 224         struct rtable                   fake_rtable;
 225         bool                            nf_call_iptables;
 226         bool                            nf_call_ip6tables;
 227         bool                            nf_call_arptables;
 228 #endif
 229         u16                             group_fwd_mask;
 230
 231         /* STP */
 232         bridge_id                       designated_root;
 233         bridge_id                       bridge_id;
 234         u32                             root_path_cost;
 235         unsigned long                   max_age;
 236         unsigned long                   hello_time;
 237         unsigned long                   forward_delay;
 238         unsigned long                   bridge_max_age;
 239         unsigned long                   ageing_time;
 240         unsigned long                   bridge_hello_time;
 241         unsigned long                   bridge_forward_delay;
 242
 243         u8                              group_addr[ETH_ALEN];
 244         u16                             root_port;
 245
 246         enum {
 247                 BR_NO_STP,              /* no spanning tree */
 248                 BR_KERNEL_STP,          /* old STP in kernel */
 249                 BR_USER_STP,            /* new RSTP in userspace */
 250         } stp_enabled;
 251
 252         unsigned char                   topology_change;
 253         unsigned char                   topology_change_detected;
 254
 255 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 256         unsigned char                   multicast_router;
 257
 258         u8                              multicast_disabled:1;
 259         u8                              multicast_querier:1;
 260         u8                              multicast_query_use_ifaddr:1;
 261
 262         u32                             hash_elasticity;
 263         u32                             hash_max;
 264
 265         u32                             multicast_last_member_count;
 266         u32                             multicast_startup_query_count;
 267
 268         unsigned long                   multicast_last_member_interval;
 269         unsigned long                   multicast_membership_interval;
 270         unsigned long                   multicast_querier_interval;
 271         unsigned long                   multicast_query_interval;
 272         unsigned long                   multicast_query_response_interval;
 273         unsigned long                   multicast_startup_query_interval;
 274
 275         spinlock_t                      multicast_lock;
 276         struct net_bridge_mdb_htable __rcu *mdb;
 277         struct hlist_head               router_list;
 278
 279         struct timer_list               multicast_router_timer;
 280         struct bridge_mcast_querier     ip4_querier;
 281         struct bridge_mcast_query       ip4_query;
 282 #if IS_ENABLED(CONFIG_IPV6)
 283         struct bridge_mcast_querier     ip6_querier;
 284         struct bridge_mcast_query       ip6_query;
 285 #endif /* IS_ENABLED(CONFIG_IPV6) */
 286 #endif
 287
 288         struct timer_list               hello_timer;
 289         struct timer_list               tcn_timer;
 290         struct timer_list               topology_change_timer;
 291         struct timer_list               gc_timer;
 292         struct kobject                  *ifobj;
 293 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 294         u8                              vlan_enabled;
 295         struct net_port_vlans __rcu     *vlan_info;
 296 #endif
 297 };
 298
 299 struct br_input_skb_cb {
 300         struct net_device *brdev;
 301 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 302         int igmp;
 303         int mrouters_only;
 304 #endif
 305 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 306         bool vlan_filtered;
 307 #endif
 308 };
 309
 310 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 311
 312 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 313 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 314 #else
 315 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 316 #endif
 317
 318 #define br_printk(level, br, format, args...)   \
 319         printk(level "%s: " format, (br)->dev->name, ##args)
 320
 321 #define br_err(__br, format, args...)                   \
 322         br_printk(KERN_ERR, __br, format, ##args)
 323 #define br_warn(__br, format, args...)                  \
 324         br_printk(KERN_WARNING, __br, format, ##args)
 325 #define br_notice(__br, format, args...)                \
 326         br_printk(KERN_NOTICE, __br, format, ##args)
 327 #define br_info(__br, format, args...)                  \
 328         br_printk(KERN_INFO, __br, format, ##args)
 329
 330 #define br_debug(br, format, args...)                   \
 331         pr_debug("%s: " format,  (br)->dev->name, ##args)
 332
 333 extern struct notifier_block br_device_notifier;
 334
 335 /* called under bridge lock */
 336 static inline int br_is_root_bridge(const struct net_bridge *br)
 337 {
 338         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 339 }
 340
 341 /* br_device.c */
 342 void br_dev_setup(struct net_device *dev);
 343 void br_dev_delete(struct net_device *dev, struct list_head *list);
 344 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 345 #ifdef CONFIG_NET_POLL_CONTROLLER
 346 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 347                                        struct sk_buff *skb)
 348 {
 349         struct netpoll *np = p->np;
 350
 351         if (np)
 352                 netpoll_send_skb(np, skb);
 353 }
 354
 355 int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp);
 356 void br_netpoll_disable(struct net_bridge_port *p);
 357 #else
 358 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 359                                        struct sk_buff *skb)
 360 {
 361 }
 362
 363 static inline int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 364 {
 365         return 0;
 366 }
 367
 368 static inline void br_netpoll_disable(struct net_bridge_port *p)
 369 {
 370 }
 371 #endif
 372
 373 /* br_fdb.c */
 374 int br_fdb_init(void);
 375 void br_fdb_fini(void);
 376 void br_fdb_flush(struct net_bridge *br);
 377 void br_fdb_find_delete_local(struct net_bridge *br,
 378                               const struct net_bridge_port *p,
 379                               const unsigned char *addr, u16 vid);
 380 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 381 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 382 void br_fdb_cleanup(unsigned long arg);
 383 void br_fdb_delete_by_port(struct net_bridge *br,
 384                            const struct net_bridge_port *p, int do_all);
 385 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 386                                           const unsigned char *addr, __u16 vid);
 387 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 388 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 389                    unsigned long off);
 390 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 391                   const unsigned char *addr, u16 vid);
 392 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 393                    const unsigned char *addr, u16 vid, bool added_by_user);
 394
 395 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 396                   struct net_device *dev, const unsigned char *addr);
 397 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 398                const unsigned char *addr, u16 nlh_flags);
 399 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 400                 struct net_device *dev, int idx);
 401
 402 /* br_forward.c */
 403 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 404 int br_dev_queue_push_xmit(struct sk_buff *skb);
 405 void br_forward(const struct net_bridge_port *to,
 406                 struct sk_buff *skb, struct sk_buff *skb0);
 407 int br_forward_finish(struct sk_buff *skb);
 408 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 409 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 410                       struct sk_buff *skb2, bool unicast);
 411
 412 /* br_if.c */
 413 void br_port_carrier_check(struct net_bridge_port *p);
 414 int br_add_bridge(struct net *net, const char *name);
 415 int br_del_bridge(struct net *net, const char *name);
 416 int br_add_if(struct net_bridge *br, struct net_device *dev);
 417 int br_del_if(struct net_bridge *br, struct net_device *dev);
 418 int br_min_mtu(const struct net_bridge *br);
 419 netdev_features_t br_features_recompute(struct net_bridge *br,
 420                                         netdev_features_t features);
 421
 422 /* br_input.c */
 423 int br_handle_frame_finish(struct sk_buff *skb);
 424 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 425
 426 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 427 {
 428         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 429 }
 430
 431 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 432 {
 433         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 434 }
 435
 436 /* br_ioctl.c */
 437 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 438 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 439                              void __user *arg);
 440
 441 /* br_multicast.c */
 442 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 443 extern unsigned int br_mdb_rehash_seq;
 444 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 445                      struct sk_buff *skb, u16 vid);
 446 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 447                                         struct sk_buff *skb, u16 vid);
 448 void br_multicast_add_port(struct net_bridge_port *port);
 449 void br_multicast_del_port(struct net_bridge_port *port);
 450 void br_multicast_enable_port(struct net_bridge_port *port);
 451 void br_multicast_disable_port(struct net_bridge_port *port);
 452 void br_multicast_init(struct net_bridge *br);
 453 void br_multicast_open(struct net_bridge *br);
 454 void br_multicast_stop(struct net_bridge *br);
 455 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 456                           struct sk_buff *skb);
 457 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 458                           struct sk_buff *skb, struct sk_buff *skb2);
 459 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 460 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 461 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 462 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 463 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 464 struct net_bridge_mdb_entry *
 465 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 466 struct net_bridge_mdb_entry *
 467 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 468                        struct br_ip *group);
 469 void br_multicast_free_pg(struct rcu_head *head);
 470 struct net_bridge_port_group *
 471 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 472                             struct net_bridge_port_group __rcu *next,
 473                             unsigned char state);
 474 void br_mdb_init(void);
 475 void br_mdb_uninit(void);
 476 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 477                    struct br_ip *group, int type);
 478
 479 #define mlock_dereference(X, br) \
 480         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 481
 482 static inline bool br_multicast_is_router(struct net_bridge *br)
 483 {
 484         return br->multicast_router == 2 ||
 485                (br->multicast_router == 1 &&
 486                 timer_pending(&br->multicast_router_timer));
 487 }
 488
 489 static inline bool
 490 __br_multicast_querier_exists(struct net_bridge *br,
 491                               struct bridge_mcast_querier *querier)
 492 {
 493         return time_is_before_jiffies(querier->delay_time) &&
 494                (br->multicast_querier || timer_pending(&querier->timer));
 495 }
 496
 497 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 498                                                struct ethhdr *eth)
 499 {
 500         switch (eth->h_proto) {
 501         case (htons(ETH_P_IP)):
 502                 return __br_multicast_querier_exists(br, &br->ip4_querier);
 503 #if IS_ENABLED(CONFIG_IPV6)
 504         case (htons(ETH_P_IPV6)):
 505                 return __br_multicast_querier_exists(br, &br->ip6_querier);
 506 #endif
 507         default:
 508                 return false;
 509         }
 510 }
 511 #else
 512 static inline int br_multicast_rcv(struct net_bridge *br,
 513                                    struct net_bridge_port *port,
 514                                    struct sk_buff *skb,
 515                                    u16 vid)
 516 {
 517         return 0;
 518 }
 519
 520 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 521                                                       struct sk_buff *skb, u16 vid)
 522 {
 523         return NULL;
 524 }
 525
 526 static inline void br_multicast_add_port(struct net_bridge_port *port)
 527 {
 528 }
 529
 530 static inline void br_multicast_del_port(struct net_bridge_port *port)
 531 {
 532 }
 533
 534 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 535 {
 536 }
 537
 538 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 539 {
 540 }
 541
 542 static inline void br_multicast_init(struct net_bridge *br)
 543 {
 544 }
 545
 546 static inline void br_multicast_open(struct net_bridge *br)
 547 {
 548 }
 549
 550 static inline void br_multicast_stop(struct net_bridge *br)
 551 {
 552 }
 553
 554 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 555                                         struct sk_buff *skb)
 556 {
 557 }
 558
 559 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 560                                         struct sk_buff *skb,
 561                                         struct sk_buff *skb2)
 562 {
 563 }
 564 static inline bool br_multicast_is_router(struct net_bridge *br)
 565 {
 566         return 0;
 567 }
 568 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 569                                                struct ethhdr *eth)
 570 {
 571         return false;
 572 }
 573 static inline void br_mdb_init(void)
 574 {
 575 }
 576 static inline void br_mdb_uninit(void)
 577 {
 578 }
 579 #endif
 580
 581 /* br_vlan.c */
 582 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 583 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 584                         struct sk_buff *skb, u16 *vid);
 585 bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
 586                        const struct sk_buff *skb);
 587 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 588 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 589                                const struct net_port_vlans *v,
 590                                struct sk_buff *skb);
 591 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 592 int br_vlan_delete(struct net_bridge *br, u16 vid);
 593 void br_vlan_flush(struct net_bridge *br);
 594 bool br_vlan_find(struct net_bridge *br, u16 vid);
 595 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 596 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 597 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 598 void nbp_vlan_flush(struct net_bridge_port *port);
 599 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 600
 601 static inline struct net_port_vlans *br_get_vlan_info(
 602                                                 const struct net_bridge *br)
 603 {
 604         return rcu_dereference_rtnl(br->vlan_info);
 605 }
 606
 607 static inline struct net_port_vlans *nbp_get_vlan_info(
 608                                                 const struct net_bridge_port *p)
 609 {
 610         return rcu_dereference_rtnl(p->vlan_info);
 611 }
 612
 613 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 614  * skb, the vlan tag will always be present if the frame was tagged.
 615  */
 616 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 617 {
 618         int err = 0;
 619
 620         if (vlan_tx_tag_present(skb))
 621                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 622         else {
 623                 *vid = 0;
 624                 err = -EINVAL;
 625         }
 626
 627         return err;
 628 }
 629
 630 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 631 {
 632         /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
 633          * vid wasn't set
 634          */
 635         smp_rmb();
 636         return v->pvid ?: VLAN_N_VID;
 637 }
 638
 639 #else
 640 static inline bool br_allowed_ingress(struct net_bridge *br,
 641                                       struct net_port_vlans *v,
 642                                       struct sk_buff *skb,
 643                                       u16 *vid)
 644 {
 645         return true;
 646 }
 647
 648 static inline bool br_allowed_egress(struct net_bridge *br,
 649                                      const struct net_port_vlans *v,
 650                                      const struct sk_buff *skb)
 651 {
 652         return true;
 653 }
 654
 655 static inline bool br_should_learn(struct net_bridge_port *p,
 656                                    struct sk_buff *skb, u16 *vid)
 657 {
 658         return true;
 659 }
 660
 661 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 662                                              const struct net_port_vlans *v,
 663                                              struct sk_buff *skb)
 664 {
 665         return skb;
 666 }
 667
 668 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 669 {
 670         return -EOPNOTSUPP;
 671 }
 672
 673 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 674 {
 675         return -EOPNOTSUPP;
 676 }
 677
 678 static inline void br_vlan_flush(struct net_bridge *br)
 679 {
 680 }
 681
 682 static inline bool br_vlan_find(struct net_bridge *br, u16 vid)
 683 {
 684         return false;
 685 }
 686
 687 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 688 {
 689         return -EOPNOTSUPP;
 690 }
 691
 692 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 693 {
 694         return -EOPNOTSUPP;
 695 }
 696
 697 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 698 {
 699 }
 700
 701 static inline struct net_port_vlans *br_get_vlan_info(
 702                                                 const struct net_bridge *br)
 703 {
 704         return NULL;
 705 }
 706 static inline struct net_port_vlans *nbp_get_vlan_info(
 707                                                 const struct net_bridge_port *p)
 708 {
 709         return NULL;
 710 }
 711
 712 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 713 {
 714         return false;
 715 }
 716
 717 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 718 {
 719         return 0;
 720 }
 721 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 722 {
 723         return VLAN_N_VID;      /* Returns invalid vid */
 724 }
 725 #endif
 726
 727 /* br_netfilter.c */
 728 #ifdef CONFIG_BRIDGE_NETFILTER
 729 int br_netfilter_init(void);
 730 void br_netfilter_fini(void);
 731 void br_netfilter_rtable_init(struct net_bridge *);
 732 #else
 733 #define br_netfilter_init()     (0)
 734 #define br_netfilter_fini()     do { } while (0)
 735 #define br_netfilter_rtable_init(x)
 736 #endif
 737
 738 /* br_stp.c */
 739 void br_log_state(const struct net_bridge_port *p);
 740 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 741 void br_init_port(struct net_bridge_port *p);
 742 void br_become_designated_port(struct net_bridge_port *p);
 743
 744 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 745 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 746 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 747 int br_set_max_age(struct net_bridge *br, unsigned long x);
 748
 749
 750 /* br_stp_if.c */
 751 void br_stp_enable_bridge(struct net_bridge *br);
 752 void br_stp_disable_bridge(struct net_bridge *br);
 753 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 754 void br_stp_enable_port(struct net_bridge_port *p);
 755 void br_stp_disable_port(struct net_bridge_port *p);
 756 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 757 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 758 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 759 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 760 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 761 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 762
 763 /* br_stp_bpdu.c */
 764 struct stp_proto;
 765 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 766                 struct net_device *dev);
 767
 768 /* br_stp_timer.c */
 769 void br_stp_timer_init(struct net_bridge *br);
 770 void br_stp_port_timer_init(struct net_bridge_port *p);
 771 unsigned long br_timer_value(const struct timer_list *timer);
 772
 773 /* br.c */
 774 #if IS_ENABLED(CONFIG_ATM_LANE)
 775 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 776 #endif
 777
 778 /* br_netlink.c */
 779 extern struct rtnl_link_ops br_link_ops;
 780 int br_netlink_init(void);
 781 void br_netlink_fini(void);
 782 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 783 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 784 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 785 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 786                u32 filter_mask);
 787
 788 #ifdef CONFIG_SYSFS
 789 /* br_sysfs_if.c */
 790 extern const struct sysfs_ops brport_sysfs_ops;
 791 int br_sysfs_addif(struct net_bridge_port *p);
 792 int br_sysfs_renameif(struct net_bridge_port *p);
 793
 794 /* br_sysfs_br.c */
 795 int br_sysfs_addbr(struct net_device *dev);
 796 void br_sysfs_delbr(struct net_device *dev);
 797
 798 #else
 799
 800 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 801 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 802 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 803 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 804 #endif /* CONFIG_SYSFS */
 805
 806 #endif