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