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         bool                            timer_armed;
 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         struct net_bridge_port *port =
 206                         rcu_dereference_rtnl(dev->rx_handler_data);
 207
 208         return br_port_exists(dev) ? port : NULL;
 209 }
 210
 211 static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev)
 212 {
 213         return br_port_exists(dev) ?
 214                 rtnl_dereference(dev->rx_handler_data) : NULL;
 215 }
 216
 217 struct br_cpu_netstats {
 218         u64                     rx_packets;
 219         u64                     rx_bytes;
 220         u64                     tx_packets;
 221         u64                     tx_bytes;
 222         struct u64_stats_sync   syncp;
 223 };
 224
 225 struct net_bridge
 226 {
 227         spinlock_t                      lock;
 228         struct list_head                port_list;
 229         struct net_device               *dev;
 230
 231         struct br_cpu_netstats __percpu *stats;
 232         spinlock_t                      hash_lock;
 233         struct hlist_head               hash[BR_HASH_SIZE];
 234 #ifdef CONFIG_BRIDGE_NETFILTER
 235         struct rtable                   fake_rtable;
 236         bool                            nf_call_iptables;
 237         bool                            nf_call_ip6tables;
 238         bool                            nf_call_arptables;
 239 #endif
 240         u16                             group_fwd_mask;
 241
 242         /* STP */
 243         bridge_id                       designated_root;
 244         bridge_id                       bridge_id;
 245         u32                             root_path_cost;
 246         unsigned long                   max_age;
 247         unsigned long                   hello_time;
 248         unsigned long                   forward_delay;
 249         unsigned long                   bridge_max_age;
 250         unsigned long                   ageing_time;
 251         unsigned long                   bridge_hello_time;
 252         unsigned long                   bridge_forward_delay;
 253
 254         u8                              group_addr[ETH_ALEN];
 255         u16                             root_port;
 256
 257         enum {
 258                 BR_NO_STP,              /* no spanning tree */
 259                 BR_KERNEL_STP,          /* old STP in kernel */
 260                 BR_USER_STP,            /* new RSTP in userspace */
 261         } stp_enabled;
 262
 263         unsigned char                   topology_change;
 264         unsigned char                   topology_change_detected;
 265
 266 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 267         unsigned char                   multicast_router;
 268
 269         u8                              multicast_disabled:1;
 270         u8                              multicast_querier:1;
 271         u8                              multicast_query_use_ifaddr:1;
 272
 273         u32                             hash_elasticity;
 274         u32                             hash_max;
 275
 276         u32                             multicast_last_member_count;
 277         u32                             multicast_startup_query_count;
 278
 279         unsigned long                   multicast_last_member_interval;
 280         unsigned long                   multicast_membership_interval;
 281         unsigned long                   multicast_querier_interval;
 282         unsigned long                   multicast_query_interval;
 283         unsigned long                   multicast_query_response_interval;
 284         unsigned long                   multicast_startup_query_interval;
 285
 286         spinlock_t                      multicast_lock;
 287         struct net_bridge_mdb_htable __rcu *mdb;
 288         struct hlist_head               router_list;
 289
 290         struct timer_list               multicast_router_timer;
 291         struct bridge_mcast_querier     ip4_querier;
 292         struct bridge_mcast_query       ip4_query;
 293 #if IS_ENABLED(CONFIG_IPV6)
 294         struct bridge_mcast_querier     ip6_querier;
 295         struct bridge_mcast_query       ip6_query;
 296 #endif /* IS_ENABLED(CONFIG_IPV6) */
 297 #endif
 298
 299         struct timer_list               hello_timer;
 300         struct timer_list               tcn_timer;
 301         struct timer_list               topology_change_timer;
 302         struct timer_list               gc_timer;
 303         struct kobject                  *ifobj;
 304 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 305         u8                              vlan_enabled;
 306         struct net_port_vlans __rcu     *vlan_info;
 307 #endif
 308 };
 309
 310 struct br_input_skb_cb {
 311         struct net_device *brdev;
 312 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 313         int igmp;
 314         int mrouters_only;
 315 #endif
 316 };
 317
 318 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 319
 320 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 321 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 322 #else
 323 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 324 #endif
 325
 326 #define br_printk(level, br, format, args...)   \
 327         printk(level "%s: " format, (br)->dev->name, ##args)
 328
 329 #define br_err(__br, format, args...)                   \
 330         br_printk(KERN_ERR, __br, format, ##args)
 331 #define br_warn(__br, format, args...)                  \
 332         br_printk(KERN_WARNING, __br, format, ##args)
 333 #define br_notice(__br, format, args...)                \
 334         br_printk(KERN_NOTICE, __br, format, ##args)
 335 #define br_info(__br, format, args...)                  \
 336         br_printk(KERN_INFO, __br, format, ##args)
 337
 338 #define br_debug(br, format, args...)                   \
 339         pr_debug("%s: " format,  (br)->dev->name, ##args)
 340
 341 extern struct notifier_block br_device_notifier;
 342
 343 /* called under bridge lock */
 344 static inline int br_is_root_bridge(const struct net_bridge *br)
 345 {
 346         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 347 }
 348
 349 /* br_device.c */
 350 extern void br_dev_setup(struct net_device *dev);
 351 extern void br_dev_delete(struct net_device *dev, struct list_head *list);
 352 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
 353                                struct net_device *dev);
 354 #ifdef CONFIG_NET_POLL_CONTROLLER
 355 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
 356 {
 357         return br->dev->npinfo;
 358 }
 359
 360 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 361                                        struct sk_buff *skb)
 362 {
 363         struct netpoll *np = p->np;
 364
 365         if (np)
 366                 netpoll_send_skb(np, skb);
 367 }
 368
 369 extern int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp);
 370 extern void br_netpoll_disable(struct net_bridge_port *p);
 371 #else
 372 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
 373 {
 374         return NULL;
 375 }
 376
 377 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 378                                        struct sk_buff *skb)
 379 {
 380 }
 381
 382 static inline int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 383 {
 384         return 0;
 385 }
 386
 387 static inline void br_netpoll_disable(struct net_bridge_port *p)
 388 {
 389 }
 390 #endif
 391
 392 /* br_fdb.c */
 393 extern int br_fdb_init(void);
 394 extern void br_fdb_fini(void);
 395 extern void br_fdb_flush(struct net_bridge *br);
 396 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 397                               const unsigned char *newaddr);
 398 extern void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 399 extern void br_fdb_cleanup(unsigned long arg);
 400 extern void br_fdb_delete_by_port(struct net_bridge *br,
 401                                   const struct net_bridge_port *p, int do_all);
 402 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 403                                                  const unsigned char *addr,
 404                                                  __u16 vid);
 405 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 406 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 407                           unsigned long count, unsigned long off);
 408 extern int br_fdb_insert(struct net_bridge *br,
 409                          struct net_bridge_port *source,
 410                          const unsigned char *addr,
 411                          u16 vid);
 412 extern void br_fdb_update(struct net_bridge *br,
 413                           struct net_bridge_port *source,
 414                           const unsigned char *addr,
 415                           u16 vid);
 416 extern int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, u16 vid);
 417
 418 extern int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 419                          struct net_device *dev,
 420                          const unsigned char *addr);
 421 extern int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[],
 422                       struct net_device *dev,
 423                       const unsigned char *addr,
 424                       u16 nlh_flags);
 425 extern int br_fdb_dump(struct sk_buff *skb,
 426                        struct netlink_callback *cb,
 427                        struct net_device *dev,
 428                        int idx);
 429
 430 /* br_forward.c */
 431 extern void br_deliver(const struct net_bridge_port *to,
 432                 struct sk_buff *skb);
 433 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 434 extern void br_forward(const struct net_bridge_port *to,
 435                 struct sk_buff *skb, struct sk_buff *skb0);
 436 extern int br_forward_finish(struct sk_buff *skb);
 437 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb,
 438                              bool unicast);
 439 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 440                              struct sk_buff *skb2, bool unicast);
 441
 442 /* br_if.c */
 443 extern void br_port_carrier_check(struct net_bridge_port *p);
 444 extern int br_add_bridge(struct net *net, const char *name);
 445 extern int br_del_bridge(struct net *net, const char *name);
 446 extern void br_net_exit(struct net *net);
 447 extern int br_add_if(struct net_bridge *br,
 448               struct net_device *dev);
 449 extern int br_del_if(struct net_bridge *br,
 450               struct net_device *dev);
 451 extern int br_min_mtu(const struct net_bridge *br);
 452 extern netdev_features_t br_features_recompute(struct net_bridge *br,
 453         netdev_features_t features);
 454
 455 /* br_input.c */
 456 extern int br_handle_frame_finish(struct sk_buff *skb);
 457 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 458
 459 /* br_ioctl.c */
 460 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 461 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
 462
 463 /* br_multicast.c */
 464 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 465 extern unsigned int br_mdb_rehash_seq;
 466 extern int br_multicast_rcv(struct net_bridge *br,
 467                             struct net_bridge_port *port,
 468                             struct sk_buff *skb);
 469 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 470                                                struct sk_buff *skb, u16 vid);
 471 extern void br_multicast_add_port(struct net_bridge_port *port);
 472 extern void br_multicast_del_port(struct net_bridge_port *port);
 473 extern void br_multicast_enable_port(struct net_bridge_port *port);
 474 extern void br_multicast_disable_port(struct net_bridge_port *port);
 475 extern void br_multicast_init(struct net_bridge *br);
 476 extern void br_multicast_open(struct net_bridge *br);
 477 extern void br_multicast_stop(struct net_bridge *br);
 478 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 479                                  struct sk_buff *skb);
 480 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 481                                  struct sk_buff *skb, struct sk_buff *skb2);
 482 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 483 extern int br_multicast_set_port_router(struct net_bridge_port *p,
 484                                         unsigned long val);
 485 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 486 extern int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 487 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 488 extern struct net_bridge_mdb_entry *br_mdb_ip_get(
 489                                 struct net_bridge_mdb_htable *mdb,
 490                                 struct br_ip *dst);
 491 extern struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 492                                 struct net_bridge_port *port, struct br_ip *group);
 493 extern void br_multicast_free_pg(struct rcu_head *head);
 494 extern struct net_bridge_port_group *br_multicast_new_port_group(
 495                                 struct net_bridge_port *port,
 496                                 struct br_ip *group,
 497                                 struct net_bridge_port_group *next,
 498                                 unsigned char state);
 499 extern void br_mdb_init(void);
 500 extern void br_mdb_uninit(void);
 501 extern void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 502                           struct br_ip *group, int type);
 503
 504 #define mlock_dereference(X, br) \
 505         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 506
 507 #if IS_ENABLED(CONFIG_IPV6)
 508 #include <net/addrconf.h>
 509 static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
 510 {
 511         if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
 512                 return 1;
 513         return 0;
 514 }
 515 #endif
 516
 517 static inline bool br_multicast_is_router(struct net_bridge *br)
 518 {
 519         return br->multicast_router == 2 ||
 520                (br->multicast_router == 1 &&
 521                 timer_pending(&br->multicast_router_timer));
 522 }
 523
 524 static inline bool
 525 __br_multicast_querier_exists(struct net_bridge *br,
 526                               struct bridge_mcast_querier *querier)
 527 {
 528         return time_is_before_jiffies(querier->delay_time) &&
 529                (br->multicast_querier || timer_pending(&querier->timer));
 530 }
 531
 532 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 533                                                struct ethhdr *eth)
 534 {
 535         switch (eth->h_proto) {
 536         case (htons(ETH_P_IP)):
 537                 return __br_multicast_querier_exists(br, &br->ip4_querier);
 538 #if IS_ENABLED(CONFIG_IPV6)
 539         case (htons(ETH_P_IPV6)):
 540                 return __br_multicast_querier_exists(br, &br->ip6_querier);
 541 #endif
 542         default:
 543                 return false;
 544         }
 545 }
 546 #else
 547 static inline int br_multicast_rcv(struct net_bridge *br,
 548                                    struct net_bridge_port *port,
 549                                    struct sk_buff *skb)
 550 {
 551         return 0;
 552 }
 553
 554 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 555                                                       struct sk_buff *skb, u16 vid)
 556 {
 557         return NULL;
 558 }
 559
 560 static inline void br_multicast_add_port(struct net_bridge_port *port)
 561 {
 562 }
 563
 564 static inline void br_multicast_del_port(struct net_bridge_port *port)
 565 {
 566 }
 567
 568 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 569 {
 570 }
 571
 572 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 573 {
 574 }
 575
 576 static inline void br_multicast_init(struct net_bridge *br)
 577 {
 578 }
 579
 580 static inline void br_multicast_open(struct net_bridge *br)
 581 {
 582 }
 583
 584 static inline void br_multicast_stop(struct net_bridge *br)
 585 {
 586 }
 587
 588 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 589                                         struct sk_buff *skb)
 590 {
 591 }
 592
 593 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 594                                         struct sk_buff *skb,
 595                                         struct sk_buff *skb2)
 596 {
 597 }
 598 static inline bool br_multicast_is_router(struct net_bridge *br)
 599 {
 600         return 0;
 601 }
 602 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 603                                                struct ethhdr *eth)
 604 {
 605         return false;
 606 }
 607 static inline void br_mdb_init(void)
 608 {
 609 }
 610 static inline void br_mdb_uninit(void)
 611 {
 612 }
 613 #endif
 614
 615 /* br_vlan.c */
 616 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 617 extern bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 618                                struct sk_buff *skb, u16 *vid);
 619 extern bool br_allowed_egress(struct net_bridge *br,
 620                               const struct net_port_vlans *v,
 621                               const struct sk_buff *skb);
 622 extern struct sk_buff *br_handle_vlan(struct net_bridge *br,
 623                                       const struct net_port_vlans *v,
 624                                       struct sk_buff *skb);
 625 extern int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 626 extern int br_vlan_delete(struct net_bridge *br, u16 vid);
 627 extern void br_vlan_flush(struct net_bridge *br);
 628 extern int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 629 extern int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 630 extern int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 631 extern void nbp_vlan_flush(struct net_bridge_port *port);
 632 extern bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 633
 634 static inline struct net_port_vlans *br_get_vlan_info(
 635                                                 const struct net_bridge *br)
 636 {
 637         return rcu_dereference_rtnl(br->vlan_info);
 638 }
 639
 640 static inline struct net_port_vlans *nbp_get_vlan_info(
 641                                                 const struct net_bridge_port *p)
 642 {
 643         return rcu_dereference_rtnl(p->vlan_info);
 644 }
 645
 646 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 647  * skb, the vlan tag will always be present if the frame was tagged.
 648  */
 649 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 650 {
 651         int err = 0;
 652
 653         if (vlan_tx_tag_present(skb))
 654                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 655         else {
 656                 *vid = 0;
 657                 err = -EINVAL;
 658         }
 659
 660         return err;
 661 }
 662
 663 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 664 {
 665         /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
 666          * vid wasn't set
 667          */
 668         smp_rmb();
 669         return (v->pvid & VLAN_TAG_PRESENT) ?
 670                         (v->pvid & ~VLAN_TAG_PRESENT) :
 671                         VLAN_N_VID;
 672 }
 673
 674 #else
 675 static inline bool br_allowed_ingress(struct net_bridge *br,
 676                                       struct net_port_vlans *v,
 677                                       struct sk_buff *skb,
 678                                       u16 *vid)
 679 {
 680         return true;
 681 }
 682
 683 static inline bool br_allowed_egress(struct net_bridge *br,
 684                                      const struct net_port_vlans *v,
 685                                      const struct sk_buff *skb)
 686 {
 687         return true;
 688 }
 689
 690 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 691                                              const struct net_port_vlans *v,
 692                                              struct sk_buff *skb)
 693 {
 694         return skb;
 695 }
 696
 697 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 698 {
 699         return -EOPNOTSUPP;
 700 }
 701
 702 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 703 {
 704         return -EOPNOTSUPP;
 705 }
 706
 707 static inline void br_vlan_flush(struct net_bridge *br)
 708 {
 709 }
 710
 711 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 712 {
 713         return -EOPNOTSUPP;
 714 }
 715
 716 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 717 {
 718         return -EOPNOTSUPP;
 719 }
 720
 721 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 722 {
 723 }
 724
 725 static inline struct net_port_vlans *br_get_vlan_info(
 726                                                 const struct net_bridge *br)
 727 {
 728         return NULL;
 729 }
 730 static inline struct net_port_vlans *nbp_get_vlan_info(
 731                                                 const struct net_bridge_port *p)
 732 {
 733         return NULL;
 734 }
 735
 736 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 737 {
 738         return false;
 739 }
 740
 741 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 742 {
 743         return 0;
 744 }
 745 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 746 {
 747         return VLAN_N_VID;      /* Returns invalid vid */
 748 }
 749 #endif
 750
 751 /* br_netfilter.c */
 752 #ifdef CONFIG_BRIDGE_NETFILTER
 753 extern int br_netfilter_init(void);
 754 extern void br_netfilter_fini(void);
 755 extern void br_netfilter_rtable_init(struct net_bridge *);
 756 #else
 757 #define br_netfilter_init()     (0)
 758 #define br_netfilter_fini()     do { } while(0)
 759 #define br_netfilter_rtable_init(x)
 760 #endif
 761
 762 /* br_stp.c */
 763 extern void br_log_state(const struct net_bridge_port *p);
 764 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 765                                            u16 port_no);
 766 extern void br_init_port(struct net_bridge_port *p);
 767 extern void br_become_designated_port(struct net_bridge_port *p);
 768
 769 extern int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 770 extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
 771 extern int br_set_max_age(struct net_bridge *br, unsigned long x);
 772
 773
 774 /* br_stp_if.c */
 775 extern void br_stp_enable_bridge(struct net_bridge *br);
 776 extern void br_stp_disable_bridge(struct net_bridge *br);
 777 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 778 extern void br_stp_enable_port(struct net_bridge_port *p);
 779 extern void br_stp_disable_port(struct net_bridge_port *p);
 780 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 781 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 782 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 783                                        u16 newprio);
 784 extern int br_stp_set_port_priority(struct net_bridge_port *p,
 785                                     unsigned long newprio);
 786 extern int br_stp_set_path_cost(struct net_bridge_port *p,
 787                                 unsigned long path_cost);
 788 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 789
 790 /* br_stp_bpdu.c */
 791 struct stp_proto;
 792 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 793                        struct net_device *dev);
 794
 795 /* br_stp_timer.c */
 796 extern void br_stp_timer_init(struct net_bridge *br);
 797 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 798 extern unsigned long br_timer_value(const struct timer_list *timer);
 799
 800 /* br.c */
 801 #if IS_ENABLED(CONFIG_ATM_LANE)
 802 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 803 #endif
 804
 805 /* br_netlink.c */
 806 extern struct rtnl_link_ops br_link_ops;
 807 extern int br_netlink_init(void);
 808 extern void br_netlink_fini(void);
 809 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
 810 extern int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 811 extern int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 812 extern int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 813                       struct net_device *dev, u32 filter_mask);
 814
 815 #ifdef CONFIG_SYSFS
 816 /* br_sysfs_if.c */
 817 extern const struct sysfs_ops brport_sysfs_ops;
 818 extern int br_sysfs_addif(struct net_bridge_port *p);
 819 extern int br_sysfs_renameif(struct net_bridge_port *p);
 820
 821 /* br_sysfs_br.c */
 822 extern int br_sysfs_addbr(struct net_device *dev);
 823 extern void br_sysfs_delbr(struct net_device *dev);
 824
 825 #else
 826
 827 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 828 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 829 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 830 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 831 #endif /* CONFIG_SYSFS */
 832
 833 #endif