Pileus Git - ~andy/linux/blob - net/bridge/br_private.h

   1 /*
   2  *      Linux ethernet bridge
   3  *
   4  *      Authors:
   5  *      Lennert Buytenhek               <buytenh@gnu.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _BR_PRIVATE_H
  14 #define _BR_PRIVATE_H
  15
  16 #include <linux/netdevice.h>
  17 #include <linux/if_bridge.h>
  18 #include <linux/netpoll.h>
  19 #include <linux/u64_stats_sync.h>
  20 #include <net/route.h>
  21 #include <linux/if_vlan.h>
  22
  23 #define BR_HASH_BITS 8
  24 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  25
  26 #define BR_HOLD_TIME (1*HZ)
  27
  28 #define BR_PORT_BITS    10
  29 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  30 #define BR_VLAN_BITMAP_LEN      BITS_TO_LONGS(VLAN_N_VID)
  31
  32 #define BR_VERSION      "2.3"
  33
  34 /* Control of forwarding link local multicast */
  35 #define BR_GROUPFWD_DEFAULT     0
  36 /* Don't allow forwarding control protocols like STP and LLDP */
  37 #define BR_GROUPFWD_RESTRICTED  0x4007u
  38
  39 /* Path to usermode spanning tree program */
  40 #define BR_STP_PROG     "/sbin/bridge-stp"
  41
  42 typedef struct bridge_id bridge_id;
  43 typedef struct mac_addr mac_addr;
  44 typedef __u16 port_id;
  45
  46 struct bridge_id
  47 {
  48         unsigned char   prio[2];
  49         unsigned char   addr[6];
  50 };
  51
  52 struct mac_addr
  53 {
  54         unsigned char   addr[6];
  55 };
  56
  57 struct br_ip
  58 {
  59         union {
  60                 __be32  ip4;
  61 #if IS_ENABLED(CONFIG_IPV6)
  62                 struct in6_addr ip6;
  63 #endif
  64         } u;
  65         __be16          proto;
  66         __u16           vid;
  67 };
  68
  69 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  70 /* our own querier */
  71 struct bridge_mcast_query {
  72         struct timer_list       timer;
  73         u32                     startup_sent;
  74 };
  75
  76 /* other querier */
  77 struct bridge_mcast_querier {
  78         struct timer_list               timer;
  79         unsigned long                   delay_time;
  80 };
  81 #endif
  82
  83 struct net_port_vlans {
  84         u16                             port_idx;
  85         u16                             pvid;
  86         union {
  87                 struct net_bridge_port          *port;
  88                 struct net_bridge               *br;
  89         }                               parent;
  90         struct rcu_head                 rcu;
  91         unsigned long                   vlan_bitmap[BR_VLAN_BITMAP_LEN];
  92         unsigned long                   untagged_bitmap[BR_VLAN_BITMAP_LEN];
  93         u16                             num_vlans;
  94 };
  95
  96 struct net_bridge_fdb_entry
  97 {
  98         struct hlist_node               hlist;
  99         struct net_bridge_port          *dst;
 100
 101         struct rcu_head                 rcu;
 102         unsigned long                   updated;
 103         unsigned long                   used;
 104         mac_addr                        addr;
 105         unsigned char                   is_local;
 106         unsigned char                   is_static;
 107         __u16                           vlan_id;
 108 };
 109
 110 struct net_bridge_port_group {
 111         struct net_bridge_port          *port;
 112         struct net_bridge_port_group __rcu *next;
 113         struct hlist_node               mglist;
 114         struct rcu_head                 rcu;
 115         struct timer_list               timer;
 116         struct br_ip                    addr;
 117         unsigned char                   state;
 118 };
 119
 120 struct net_bridge_mdb_entry
 121 {
 122         struct hlist_node               hlist[2];
 123         struct net_bridge               *br;
 124         struct net_bridge_port_group __rcu *ports;
 125         struct rcu_head                 rcu;
 126         struct timer_list               timer;
 127         struct br_ip                    addr;
 128         bool                            mglist;
 129 };
 130
 131 struct net_bridge_mdb_htable
 132 {
 133         struct hlist_head               *mhash;
 134         struct rcu_head                 rcu;
 135         struct net_bridge_mdb_htable    *old;
 136         u32                             size;
 137         u32                             max;
 138         u32                             secret;
 139         u32                             ver;
 140 };
 141
 142 struct net_bridge_port
 143 {
 144         struct net_bridge               *br;
 145         struct net_device               *dev;
 146         struct list_head                list;
 147
 148         /* STP */
 149         u8                              priority;
 150         u8                              state;
 151         u16                             port_no;
 152         unsigned char                   topology_change_ack;
 153         unsigned char                   config_pending;
 154         port_id                         port_id;
 155         port_id                         designated_port;
 156         bridge_id                       designated_root;
 157         bridge_id                       designated_bridge;
 158         u32                             path_cost;
 159         u32                             designated_cost;
 160         unsigned long                   designated_age;
 161
 162         struct timer_list               forward_delay_timer;
 163         struct timer_list               hold_timer;
 164         struct timer_list               message_age_timer;
 165         struct kobject                  kobj;
 166         struct rcu_head                 rcu;
 167
 168         unsigned long                   flags;
 169 #define BR_HAIRPIN_MODE         0x00000001
 170 #define BR_BPDU_GUARD           0x00000002
 171 #define BR_ROOT_BLOCK           0x00000004
 172 #define BR_MULTICAST_FAST_LEAVE 0x00000008
 173 #define BR_ADMIN_COST           0x00000010
 174 #define BR_LEARNING             0x00000020
 175 #define BR_FLOOD                0x00000040
 176
 177 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 178         struct bridge_mcast_query       ip4_query;
 179 #if IS_ENABLED(CONFIG_IPV6)
 180         struct bridge_mcast_query       ip6_query;
 181 #endif /* IS_ENABLED(CONFIG_IPV6) */
 182         unsigned char                   multicast_router;
 183         struct timer_list               multicast_router_timer;
 184         struct hlist_head               mglist;
 185         struct hlist_node               rlist;
 186 #endif
 187
 188 #ifdef CONFIG_SYSFS
 189         char                            sysfs_name[IFNAMSIZ];
 190 #endif
 191
 192 #ifdef CONFIG_NET_POLL_CONTROLLER
 193         struct netpoll                  *np;
 194 #endif
 195 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 196         struct net_port_vlans __rcu     *vlan_info;
 197 #endif
 198 };
 199
 200 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 201
 202 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 203 {
 204         return rcu_dereference(dev->rx_handler_data);
 205 }
 206
 207 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 208 {
 209         return br_port_exists(dev) ?
 210                 rtnl_dereference(dev->rx_handler_data) : NULL;
 211 }
 212
 213 struct br_cpu_netstats {
 214         u64                     rx_packets;
 215         u64                     rx_bytes;
 216         u64                     tx_packets;
 217         u64                     tx_bytes;
 218         struct u64_stats_sync   syncp;
 219 };
 220
 221 struct net_bridge
 222 {
 223         spinlock_t                      lock;
 224         struct list_head                port_list;
 225         struct net_device               *dev;
 226
 227         struct br_cpu_netstats __percpu *stats;
 228         spinlock_t                      hash_lock;
 229         struct hlist_head               hash[BR_HASH_SIZE];
 230 #ifdef CONFIG_BRIDGE_NETFILTER
 231         struct rtable                   fake_rtable;
 232         bool                            nf_call_iptables;
 233         bool                            nf_call_ip6tables;
 234         bool                            nf_call_arptables;
 235 #endif
 236         u16                             group_fwd_mask;
 237
 238         /* STP */
 239         bridge_id                       designated_root;
 240         bridge_id                       bridge_id;
 241         u32                             root_path_cost;
 242         unsigned long                   max_age;
 243         unsigned long                   hello_time;
 244         unsigned long                   forward_delay;
 245         unsigned long                   bridge_max_age;
 246         unsigned long                   ageing_time;
 247         unsigned long                   bridge_hello_time;
 248         unsigned long                   bridge_forward_delay;
 249
 250         u8                              group_addr[ETH_ALEN];
 251         u16                             root_port;
 252
 253         enum {
 254                 BR_NO_STP,              /* no spanning tree */
 255                 BR_KERNEL_STP,          /* old STP in kernel */
 256                 BR_USER_STP,            /* new RSTP in userspace */
 257         } stp_enabled;
 258
 259         unsigned char                   topology_change;
 260         unsigned char                   topology_change_detected;
 261
 262 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 263         unsigned char                   multicast_router;
 264
 265         u8                              multicast_disabled:1;
 266         u8                              multicast_querier:1;
 267         u8                              multicast_query_use_ifaddr:1;
 268
 269         u32                             hash_elasticity;
 270         u32                             hash_max;
 271
 272         u32                             multicast_last_member_count;
 273         u32                             multicast_startup_query_count;
 274
 275         unsigned long                   multicast_last_member_interval;
 276         unsigned long                   multicast_membership_interval;
 277         unsigned long                   multicast_querier_interval;
 278         unsigned long                   multicast_query_interval;
 279         unsigned long                   multicast_query_response_interval;
 280         unsigned long                   multicast_startup_query_interval;
 281
 282         spinlock_t                      multicast_lock;
 283         struct net_bridge_mdb_htable __rcu *mdb;
 284         struct hlist_head               router_list;
 285
 286         struct timer_list               multicast_router_timer;
 287         struct bridge_mcast_querier     ip4_querier;
 288         struct bridge_mcast_query       ip4_query;
 289 #if IS_ENABLED(CONFIG_IPV6)
 290         struct bridge_mcast_querier     ip6_querier;
 291         struct bridge_mcast_query       ip6_query;
 292 #endif /* IS_ENABLED(CONFIG_IPV6) */
 293 #endif
 294
 295         struct timer_list               hello_timer;
 296         struct timer_list               tcn_timer;
 297         struct timer_list               topology_change_timer;
 298         struct timer_list               gc_timer;
 299         struct kobject                  *ifobj;
 300 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 301         u8                              vlan_enabled;
 302         struct net_port_vlans __rcu     *vlan_info;
 303 #endif
 304 };
 305
 306 struct br_input_skb_cb {
 307         struct net_device *brdev;
 308 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 309         int igmp;
 310         int mrouters_only;
 311 #endif
 312 };
 313
 314 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 315
 316 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 317 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 318 #else
 319 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 320 #endif
 321
 322 #define br_printk(level, br, format, args...)   \
 323         printk(level "%s: " format, (br)->dev->name, ##args)
 324
 325 #define br_err(__br, format, args...)                   \
 326         br_printk(KERN_ERR, __br, format, ##args)
 327 #define br_warn(__br, format, args...)                  \
 328         br_printk(KERN_WARNING, __br, format, ##args)
 329 #define br_notice(__br, format, args...)                \
 330         br_printk(KERN_NOTICE, __br, format, ##args)
 331 #define br_info(__br, format, args...)                  \
 332         br_printk(KERN_INFO, __br, format, ##args)
 333
 334 #define br_debug(br, format, args...)                   \
 335         pr_debug("%s: " format,  (br)->dev->name, ##args)
 336
 337 extern struct notifier_block br_device_notifier;
 338
 339 /* called under bridge lock */
 340 static inline int br_is_root_bridge(const struct net_bridge *br)
 341 {
 342         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 343 }
 344
 345 /* br_device.c */
 346 void br_dev_setup(struct net_device *dev);
 347 void br_dev_delete(struct net_device *dev, struct list_head *list);
 348 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 349 #ifdef CONFIG_NET_POLL_CONTROLLER
 350 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 351                                        struct sk_buff *skb)
 352 {
 353         struct netpoll *np = p->np;
 354
 355         if (np)
 356                 netpoll_send_skb(np, skb);
 357 }
 358
 359 int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp);
 360 void br_netpoll_disable(struct net_bridge_port *p);
 361 #else
 362 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 363                                        struct sk_buff *skb)
 364 {
 365 }
 366
 367 static inline int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 368 {
 369         return 0;
 370 }
 371
 372 static inline void br_netpoll_disable(struct net_bridge_port *p)
 373 {
 374 }
 375 #endif
 376
 377 /* br_fdb.c */
 378 int br_fdb_init(void);
 379 void br_fdb_fini(void);
 380 void br_fdb_flush(struct net_bridge *br);
 381 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 382 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 383 void br_fdb_cleanup(unsigned long arg);
 384 void br_fdb_delete_by_port(struct net_bridge *br,
 385                            const struct net_bridge_port *p, int do_all);
 386 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 387                                           const unsigned char *addr, __u16 vid);
 388 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 389 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 390                    unsigned long off);
 391 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 392                   const unsigned char *addr, u16 vid);
 393 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 394                    const unsigned char *addr, u16 vid);
 395 int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, u16 vid);
 396
 397 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 398                   struct net_device *dev, const unsigned char *addr);
 399 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 400                const unsigned char *addr, u16 nlh_flags);
 401 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 402                 struct net_device *dev, int idx);
 403
 404 /* br_forward.c */
 405 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 406 int br_dev_queue_push_xmit(struct sk_buff *skb);
 407 void br_forward(const struct net_bridge_port *to,
 408                 struct sk_buff *skb, struct sk_buff *skb0);
 409 int br_forward_finish(struct sk_buff *skb);
 410 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 411 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 412                       struct sk_buff *skb2, bool unicast);
 413
 414 /* br_if.c */
 415 void br_port_carrier_check(struct net_bridge_port *p);
 416 int br_add_bridge(struct net *net, const char *name);
 417 int br_del_bridge(struct net *net, const char *name);
 418 void br_net_exit(struct net *net);
 419 int br_add_if(struct net_bridge *br, struct net_device *dev);
 420 int br_del_if(struct net_bridge *br, struct net_device *dev);
 421 int br_min_mtu(const struct net_bridge *br);
 422 netdev_features_t br_features_recompute(struct net_bridge *br,
 423                                         netdev_features_t features);
 424
 425 /* br_input.c */
 426 int br_handle_frame_finish(struct sk_buff *skb);
 427 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 428
 429 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 430 {
 431         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 432 }
 433
 434 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 435 {
 436         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 437 }
 438
 439 /* br_ioctl.c */
 440 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 441 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 442                              void __user *arg);
 443
 444 /* br_multicast.c */
 445 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 446 extern unsigned int br_mdb_rehash_seq;
 447 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 448                      struct sk_buff *skb, u16 vid);
 449 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 450                                         struct sk_buff *skb, u16 vid);
 451 void br_multicast_add_port(struct net_bridge_port *port);
 452 void br_multicast_del_port(struct net_bridge_port *port);
 453 void br_multicast_enable_port(struct net_bridge_port *port);
 454 void br_multicast_disable_port(struct net_bridge_port *port);
 455 void br_multicast_init(struct net_bridge *br);
 456 void br_multicast_open(struct net_bridge *br);
 457 void br_multicast_stop(struct net_bridge *br);
 458 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 459                           struct sk_buff *skb);
 460 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 461                           struct sk_buff *skb, struct sk_buff *skb2);
 462 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 463 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 464 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 465 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 466 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 467 struct net_bridge_mdb_entry *
 468 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 469 struct net_bridge_mdb_entry *
 470 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 471                        struct br_ip *group);
 472 void br_multicast_free_pg(struct rcu_head *head);
 473 struct net_bridge_port_group *
 474 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 475                             struct net_bridge_port_group __rcu *next,
 476                             unsigned char state);
 477 void br_mdb_init(void);
 478 void br_mdb_uninit(void);
 479 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 480                    struct br_ip *group, int type);
 481
 482 #define mlock_dereference(X, br) \
 483         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 484
 485 static inline bool br_multicast_is_router(struct net_bridge *br)
 486 {
 487         return br->multicast_router == 2 ||
 488                (br->multicast_router == 1 &&
 489                 timer_pending(&br->multicast_router_timer));
 490 }
 491
 492 static inline bool
 493 __br_multicast_querier_exists(struct net_bridge *br,
 494                               struct bridge_mcast_querier *querier)
 495 {
 496         return time_is_before_jiffies(querier->delay_time) &&
 497                (br->multicast_querier || timer_pending(&querier->timer));
 498 }
 499
 500 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 501                                                struct ethhdr *eth)
 502 {
 503         switch (eth->h_proto) {
 504         case (htons(ETH_P_IP)):
 505                 return __br_multicast_querier_exists(br, &br->ip4_querier);
 506 #if IS_ENABLED(CONFIG_IPV6)
 507         case (htons(ETH_P_IPV6)):
 508                 return __br_multicast_querier_exists(br, &br->ip6_querier);
 509 #endif
 510         default:
 511                 return false;
 512         }
 513 }
 514 #else
 515 static inline int br_multicast_rcv(struct net_bridge *br,
 516                                    struct net_bridge_port *port,
 517                                    struct sk_buff *skb,
 518                                    u16 vid)
 519 {
 520         return 0;
 521 }
 522
 523 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 524                                                       struct sk_buff *skb, u16 vid)
 525 {
 526         return NULL;
 527 }
 528
 529 static inline void br_multicast_add_port(struct net_bridge_port *port)
 530 {
 531 }
 532
 533 static inline void br_multicast_del_port(struct net_bridge_port *port)
 534 {
 535 }
 536
 537 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 538 {
 539 }
 540
 541 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 542 {
 543 }
 544
 545 static inline void br_multicast_init(struct net_bridge *br)
 546 {
 547 }
 548
 549 static inline void br_multicast_open(struct net_bridge *br)
 550 {
 551 }
 552
 553 static inline void br_multicast_stop(struct net_bridge *br)
 554 {
 555 }
 556
 557 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 558                                         struct sk_buff *skb)
 559 {
 560 }
 561
 562 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 563                                         struct sk_buff *skb,
 564                                         struct sk_buff *skb2)
 565 {
 566 }
 567 static inline bool br_multicast_is_router(struct net_bridge *br)
 568 {
 569         return 0;
 570 }
 571 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 572                                                struct ethhdr *eth)
 573 {
 574         return false;
 575 }
 576 static inline void br_mdb_init(void)
 577 {
 578 }
 579 static inline void br_mdb_uninit(void)
 580 {
 581 }
 582 #endif
 583
 584 /* br_vlan.c */
 585 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 586 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 587                         struct sk_buff *skb, u16 *vid);
 588 bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
 589                        const struct sk_buff *skb);
 590 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 591                                const struct net_port_vlans *v,
 592                                struct sk_buff *skb);
 593 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 594 int br_vlan_delete(struct net_bridge *br, u16 vid);
 595 void br_vlan_flush(struct net_bridge *br);
 596 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 597 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 598 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 599 void nbp_vlan_flush(struct net_bridge_port *port);
 600 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 601
 602 static inline struct net_port_vlans *br_get_vlan_info(
 603                                                 const struct net_bridge *br)
 604 {
 605         return rcu_dereference_rtnl(br->vlan_info);
 606 }
 607
 608 static inline struct net_port_vlans *nbp_get_vlan_info(
 609                                                 const struct net_bridge_port *p)
 610 {
 611         return rcu_dereference_rtnl(p->vlan_info);
 612 }
 613
 614 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 615  * skb, the vlan tag will always be present if the frame was tagged.
 616  */
 617 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 618 {
 619         int err = 0;
 620
 621         if (vlan_tx_tag_present(skb))
 622                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 623         else {
 624                 *vid = 0;
 625                 err = -EINVAL;
 626         }
 627
 628         return err;
 629 }
 630
 631 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 632 {
 633         /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
 634          * vid wasn't set
 635          */
 636         smp_rmb();
 637         return v->pvid ?: VLAN_N_VID;
 638 }
 639
 640 #else
 641 static inline bool br_allowed_ingress(struct net_bridge *br,
 642                                       struct net_port_vlans *v,
 643                                       struct sk_buff *skb,
 644                                       u16 *vid)
 645 {
 646         return true;
 647 }
 648
 649 static inline bool br_allowed_egress(struct net_bridge *br,
 650                                      const struct net_port_vlans *v,
 651                                      const struct sk_buff *skb)
 652 {
 653         return true;
 654 }
 655
 656 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 657                                              const struct net_port_vlans *v,
 658                                              struct sk_buff *skb)
 659 {
 660         return skb;
 661 }
 662
 663 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 664 {
 665         return -EOPNOTSUPP;
 666 }
 667
 668 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 669 {
 670         return -EOPNOTSUPP;
 671 }
 672
 673 static inline void br_vlan_flush(struct net_bridge *br)
 674 {
 675 }
 676
 677 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 678 {
 679         return -EOPNOTSUPP;
 680 }
 681
 682 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 683 {
 684         return -EOPNOTSUPP;
 685 }
 686
 687 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 688 {
 689 }
 690
 691 static inline struct net_port_vlans *br_get_vlan_info(
 692                                                 const struct net_bridge *br)
 693 {
 694         return NULL;
 695 }
 696 static inline struct net_port_vlans *nbp_get_vlan_info(
 697                                                 const struct net_bridge_port *p)
 698 {
 699         return NULL;
 700 }
 701
 702 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 703 {
 704         return false;
 705 }
 706
 707 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 708 {
 709         return 0;
 710 }
 711 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 712 {
 713         return VLAN_N_VID;      /* Returns invalid vid */
 714 }
 715 #endif
 716
 717 /* br_netfilter.c */
 718 #ifdef CONFIG_BRIDGE_NETFILTER
 719 int br_netfilter_init(void);
 720 void br_netfilter_fini(void);
 721 void br_netfilter_rtable_init(struct net_bridge *);
 722 #else
 723 #define br_netfilter_init()     (0)
 724 #define br_netfilter_fini()     do { } while(0)
 725 #define br_netfilter_rtable_init(x)
 726 #endif
 727
 728 /* br_stp.c */
 729 void br_log_state(const struct net_bridge_port *p);
 730 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 731 void br_init_port(struct net_bridge_port *p);
 732 void br_become_designated_port(struct net_bridge_port *p);
 733
 734 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 735 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 736 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 737 int br_set_max_age(struct net_bridge *br, unsigned long x);
 738
 739
 740 /* br_stp_if.c */
 741 void br_stp_enable_bridge(struct net_bridge *br);
 742 void br_stp_disable_bridge(struct net_bridge *br);
 743 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 744 void br_stp_enable_port(struct net_bridge_port *p);
 745 void br_stp_disable_port(struct net_bridge_port *p);
 746 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 747 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 748 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 749 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 750 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 751 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 752
 753 /* br_stp_bpdu.c */
 754 struct stp_proto;
 755 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 756                 struct net_device *dev);
 757
 758 /* br_stp_timer.c */
 759 void br_stp_timer_init(struct net_bridge *br);
 760 void br_stp_port_timer_init(struct net_bridge_port *p);
 761 unsigned long br_timer_value(const struct timer_list *timer);
 762
 763 /* br.c */
 764 #if IS_ENABLED(CONFIG_ATM_LANE)
 765 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 766 #endif
 767
 768 /* br_netlink.c */
 769 extern struct rtnl_link_ops br_link_ops;
 770 int br_netlink_init(void);
 771 void br_netlink_fini(void);
 772 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 773 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 774 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 775 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 776                u32 filter_mask);
 777
 778 #ifdef CONFIG_SYSFS
 779 /* br_sysfs_if.c */
 780 extern const struct sysfs_ops brport_sysfs_ops;
 781 int br_sysfs_addif(struct net_bridge_port *p);
 782 int br_sysfs_renameif(struct net_bridge_port *p);
 783
 784 /* br_sysfs_br.c */
 785 int br_sysfs_addbr(struct net_device *dev);
 786 void br_sysfs_delbr(struct net_device *dev);
 787
 788 #else
 789
 790 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 791 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 792 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 793 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 794 #endif /* CONFIG_SYSFS */
 795
 796 #endif