net/bridge/br_private.h

   1 /*
   2  *      Linux ethernet bridge
   3  *
   4  *      Authors:
   5  *      Lennert Buytenhek               <buytenh@gnu.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _BR_PRIVATE_H
  14 #define _BR_PRIVATE_H
  15
  16 #include <linux/netdevice.h>
  17 #include <linux/if_bridge.h>
  18 #include <linux/netpoll.h>
  19 #include <linux/u64_stats_sync.h>
  20 #include <net/route.h>
  21 #include <linux/if_vlan.h>
  22
  23 #define BR_HASH_BITS 8
  24 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  25
  26 #define BR_HOLD_TIME (1*HZ)
  27
  28 #define BR_PORT_BITS    10
  29 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  30 #define BR_VLAN_BITMAP_LEN      BITS_TO_LONGS(VLAN_N_VID)
  31
  32 #define BR_VERSION      "2.3"
  33
  34 /* Control of forwarding link local multicast */
  35 #define BR_GROUPFWD_DEFAULT     0
  36 /* Don't allow forwarding control protocols like STP and LLDP */
  37 #define BR_GROUPFWD_RESTRICTED  0x4007u
  38
  39 /* Path to usermode spanning tree program */
  40 #define BR_STP_PROG     "/sbin/bridge-stp"
  41
  42 typedef struct bridge_id bridge_id;
  43 typedef struct mac_addr mac_addr;
  44 typedef __u16 port_id;
  45
  46 struct bridge_id
  47 {
  48         unsigned char   prio[2];
  49         unsigned char   addr[ETH_ALEN];
  50 };
  51
  52 struct mac_addr
  53 {
  54         unsigned char   addr[ETH_ALEN];
  55 };
  56
  57 struct br_ip
  58 {
  59         union {
  60                 __be32  ip4;
  61 #if IS_ENABLED(CONFIG_IPV6)
  62                 struct in6_addr ip6;
  63 #endif
  64         } u;
  65         __be16          proto;
  66         __u16           vid;
  67 };
  68
  69 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  70 /* our own querier */
  71 struct bridge_mcast_query {
  72         struct timer_list       timer;
  73         u32                     startup_sent;
  74 };
  75
  76 /* other querier */
  77 struct bridge_mcast_querier {
  78         struct timer_list               timer;
  79         unsigned long                   delay_time;
  80 };
  81 #endif
  82
  83 struct net_port_vlans {
  84         u16                             port_idx;
  85         u16                             pvid;
  86         union {
  87                 struct net_bridge_port          *port;
  88                 struct net_bridge               *br;
  89         }                               parent;
  90         struct rcu_head                 rcu;
  91         unsigned long                   vlan_bitmap[BR_VLAN_BITMAP_LEN];
  92         unsigned long                   untagged_bitmap[BR_VLAN_BITMAP_LEN];
  93         u16                             num_vlans;
  94 };
  95
  96 struct net_bridge_fdb_entry
  97 {
  98         struct hlist_node               hlist;
  99         struct net_bridge_port          *dst;
 100
 101         struct rcu_head                 rcu;
 102         unsigned long                   updated;
 103         unsigned long                   used;
 104         mac_addr                        addr;
 105         unsigned char                   is_local;
 106         unsigned char                   is_static;
 107         unsigned char                   added_by_user;
 108         __u16                           vlan_id;
 109 };
 110
 111 struct net_bridge_port_group {
 112         struct net_bridge_port          *port;
 113         struct net_bridge_port_group __rcu *next;
 114         struct hlist_node               mglist;
 115         struct rcu_head                 rcu;
 116         struct timer_list               timer;
 117         struct br_ip                    addr;
 118         unsigned char                   state;
 119 };
 120
 121 struct net_bridge_mdb_entry
 122 {
 123         struct hlist_node               hlist[2];
 124         struct net_bridge               *br;
 125         struct net_bridge_port_group __rcu *ports;
 126         struct rcu_head                 rcu;
 127         struct timer_list               timer;
 128         struct br_ip                    addr;
 129         bool                            mglist;
 130 };
 131
 132 struct net_bridge_mdb_htable
 133 {
 134         struct hlist_head               *mhash;
 135         struct rcu_head                 rcu;
 136         struct net_bridge_mdb_htable    *old;
 137         u32                             size;
 138         u32                             max;
 139         u32                             secret;
 140         u32                             ver;
 141 };
 142
 143 struct net_bridge_port
 144 {
 145         struct net_bridge               *br;
 146         struct net_device               *dev;
 147         struct list_head                list;
 148
 149         /* STP */
 150         u8                              priority;
 151         u8                              state;
 152         u16                             port_no;
 153         unsigned char                   topology_change_ack;
 154         unsigned char                   config_pending;
 155         port_id                         port_id;
 156         port_id                         designated_port;
 157         bridge_id                       designated_root;
 158         bridge_id                       designated_bridge;
 159         u32                             path_cost;
 160         u32                             designated_cost;
 161         unsigned long                   designated_age;
 162
 163         struct timer_list               forward_delay_timer;
 164         struct timer_list               hold_timer;
 165         struct timer_list               message_age_timer;
 166         struct kobject                  kobj;
 167         struct rcu_head                 rcu;
 168
 169         unsigned long                   flags;
 170 #define BR_HAIRPIN_MODE         0x00000001
 171 #define BR_BPDU_GUARD           0x00000002
 172 #define BR_ROOT_BLOCK           0x00000004
 173 #define BR_MULTICAST_FAST_LEAVE 0x00000008
 174 #define BR_ADMIN_COST           0x00000010
 175 #define BR_LEARNING             0x00000020
 176 #define BR_FLOOD                0x00000040
 177 #define BR_AUTO_MASK (BR_FLOOD | BR_LEARNING)
 178 #define BR_PROMISC              0x00000080
 179
 180 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 181         struct bridge_mcast_query       ip4_query;
 182 #if IS_ENABLED(CONFIG_IPV6)
 183         struct bridge_mcast_query       ip6_query;
 184 #endif /* IS_ENABLED(CONFIG_IPV6) */
 185         unsigned char                   multicast_router;
 186         struct timer_list               multicast_router_timer;
 187         struct hlist_head               mglist;
 188         struct hlist_node               rlist;
 189 #endif
 190
 191 #ifdef CONFIG_SYSFS
 192         char                            sysfs_name[IFNAMSIZ];
 193 #endif
 194
 195 #ifdef CONFIG_NET_POLL_CONTROLLER
 196         struct netpoll                  *np;
 197 #endif
 198 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 199         struct net_port_vlans __rcu     *vlan_info;
 200 #endif
 201 };
 202
 203 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 204 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 205
 206 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 207
 208 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 209 {
 210         return rcu_dereference(dev->rx_handler_data);
 211 }
 212
 213 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 214 {
 215         return br_port_exists(dev) ?
 216                 rtnl_dereference(dev->rx_handler_data) : NULL;
 217 }
 218
 219 struct net_bridge
 220 {
 221         spinlock_t                      lock;
 222         struct list_head                port_list;
 223         struct net_device               *dev;
 224
 225         struct pcpu_sw_netstats         __percpu *stats;
 226         spinlock_t                      hash_lock;
 227         struct hlist_head               hash[BR_HASH_SIZE];
 228 #ifdef CONFIG_BRIDGE_NETFILTER
 229         struct rtable                   fake_rtable;
 230         bool                            nf_call_iptables;
 231         bool                            nf_call_ip6tables;
 232         bool                            nf_call_arptables;
 233 #endif
 234         u16                             group_fwd_mask;
 235
 236         /* STP */
 237         bridge_id                       designated_root;
 238         bridge_id                       bridge_id;
 239         u32                             root_path_cost;
 240         unsigned long                   max_age;
 241         unsigned long                   hello_time;
 242         unsigned long                   forward_delay;
 243         unsigned long                   bridge_max_age;
 244         unsigned long                   ageing_time;
 245         unsigned long                   bridge_hello_time;
 246         unsigned long                   bridge_forward_delay;
 247
 248         u8                              group_addr[ETH_ALEN];
 249         u16                             root_port;
 250
 251         enum {
 252                 BR_NO_STP,              /* no spanning tree */
 253                 BR_KERNEL_STP,          /* old STP in kernel */
 254                 BR_USER_STP,            /* new RSTP in userspace */
 255         } stp_enabled;
 256
 257         unsigned char                   topology_change;
 258         unsigned char                   topology_change_detected;
 259
 260 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 261         unsigned char                   multicast_router;
 262
 263         u8                              multicast_disabled:1;
 264         u8                              multicast_querier:1;
 265         u8                              multicast_query_use_ifaddr:1;
 266
 267         u32                             hash_elasticity;
 268         u32                             hash_max;
 269
 270         u32                             multicast_last_member_count;
 271         u32                             multicast_startup_query_count;
 272
 273         unsigned long                   multicast_last_member_interval;
 274         unsigned long                   multicast_membership_interval;
 275         unsigned long                   multicast_querier_interval;
 276         unsigned long                   multicast_query_interval;
 277         unsigned long                   multicast_query_response_interval;
 278         unsigned long                   multicast_startup_query_interval;
 279
 280         spinlock_t                      multicast_lock;
 281         struct net_bridge_mdb_htable __rcu *mdb;
 282         struct hlist_head               router_list;
 283
 284         struct timer_list               multicast_router_timer;
 285         struct bridge_mcast_querier     ip4_querier;
 286         struct bridge_mcast_query       ip4_query;
 287 #if IS_ENABLED(CONFIG_IPV6)
 288         struct bridge_mcast_querier     ip6_querier;
 289         struct bridge_mcast_query       ip6_query;
 290 #endif /* IS_ENABLED(CONFIG_IPV6) */
 291 #endif
 292
 293         struct timer_list               hello_timer;
 294         struct timer_list               tcn_timer;
 295         struct timer_list               topology_change_timer;
 296         struct timer_list               gc_timer;
 297         struct kobject                  *ifobj;
 298         u32                             auto_cnt;
 299 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 300         u8                              vlan_enabled;
 301         struct net_port_vlans __rcu     *vlan_info;
 302 #endif
 303 };
 304
 305 struct br_input_skb_cb {
 306         struct net_device *brdev;
 307 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 308         int igmp;
 309         int mrouters_only;
 310 #endif
 311 };
 312
 313 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 314
 315 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 316 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 317 #else
 318 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 319 #endif
 320
 321 #define br_printk(level, br, format, args...)   \
 322         printk(level "%s: " format, (br)->dev->name, ##args)
 323
 324 #define br_err(__br, format, args...)                   \
 325         br_printk(KERN_ERR, __br, format, ##args)
 326 #define br_warn(__br, format, args...)                  \
 327         br_printk(KERN_WARNING, __br, format, ##args)
 328 #define br_notice(__br, format, args...)                \
 329         br_printk(KERN_NOTICE, __br, format, ##args)
 330 #define br_info(__br, format, args...)                  \
 331         br_printk(KERN_INFO, __br, format, ##args)
 332
 333 #define br_debug(br, format, args...)                   \
 334         pr_debug("%s: " format,  (br)->dev->name, ##args)
 335
 336 /* called under bridge lock */
 337 static inline int br_is_root_bridge(const struct net_bridge *br)
 338 {
 339         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 340 }
 341
 342 /* br_device.c */
 343 void br_dev_setup(struct net_device *dev);
 344 void br_dev_delete(struct net_device *dev, struct list_head *list);
 345 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 346 #ifdef CONFIG_NET_POLL_CONTROLLER
 347 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 348                                        struct sk_buff *skb)
 349 {
 350         struct netpoll *np = p->np;
 351
 352         if (np)
 353                 netpoll_send_skb(np, skb);
 354 }
 355
 356 int br_netpoll_enable(struct net_bridge_port *p);
 357 void br_netpoll_disable(struct net_bridge_port *p);
 358 #else
 359 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 360                                        struct sk_buff *skb)
 361 {
 362 }
 363
 364 static inline int br_netpoll_enable(struct net_bridge_port *p)
 365 {
 366         return 0;
 367 }
 368
 369 static inline void br_netpoll_disable(struct net_bridge_port *p)
 370 {
 371 }
 372 #endif
 373
 374 /* br_fdb.c */
 375 int br_fdb_init(void);
 376 void br_fdb_fini(void);
 377 void br_fdb_flush(struct net_bridge *br);
 378 void br_fdb_find_delete_local(struct net_bridge *br,
 379                               const struct net_bridge_port *p,
 380                               const unsigned char *addr, u16 vid);
 381 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 382 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 383 void br_fdb_cleanup(unsigned long arg);
 384 void br_fdb_delete_by_port(struct net_bridge *br,
 385                            const struct net_bridge_port *p, int do_all);
 386 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 387                                           const unsigned char *addr, __u16 vid);
 388 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 389 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 390                    unsigned long off);
 391 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 392                   const unsigned char *addr, u16 vid);
 393 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 394                    const unsigned char *addr, u16 vid, bool added_by_user);
 395
 396 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 397                   struct net_device *dev, const unsigned char *addr);
 398 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 399                const unsigned char *addr, u16 nlh_flags);
 400 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 401                 struct net_device *dev, int idx);
 402 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 403 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 404
 405 /* br_forward.c */
 406 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 407 int br_dev_queue_push_xmit(struct sk_buff *skb);
 408 void br_forward(const struct net_bridge_port *to,
 409                 struct sk_buff *skb, struct sk_buff *skb0);
 410 int br_forward_finish(struct sk_buff *skb);
 411 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 412 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 413                       struct sk_buff *skb2, bool unicast);
 414
 415 /* br_if.c */
 416 void br_port_carrier_check(struct net_bridge_port *p);
 417 int br_add_bridge(struct net *net, const char *name);
 418 int br_del_bridge(struct net *net, const char *name);
 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 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 425 void br_manage_promisc(struct net_bridge *br);
 426
 427 /* br_input.c */
 428 int br_handle_frame_finish(struct sk_buff *skb);
 429 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 430
 431 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 432 {
 433         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 434 }
 435
 436 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 437 {
 438         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 439 }
 440
 441 /* br_ioctl.c */
 442 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 443 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 444                              void __user *arg);
 445
 446 /* br_multicast.c */
 447 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 448 extern unsigned int br_mdb_rehash_seq;
 449 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 450                      struct sk_buff *skb, u16 vid);
 451 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 452                                         struct sk_buff *skb, u16 vid);
 453 void br_multicast_add_port(struct net_bridge_port *port);
 454 void br_multicast_del_port(struct net_bridge_port *port);
 455 void br_multicast_enable_port(struct net_bridge_port *port);
 456 void br_multicast_disable_port(struct net_bridge_port *port);
 457 void br_multicast_init(struct net_bridge *br);
 458 void br_multicast_open(struct net_bridge *br);
 459 void br_multicast_stop(struct net_bridge *br);
 460 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 461                           struct sk_buff *skb);
 462 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 463                           struct sk_buff *skb, struct sk_buff *skb2);
 464 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 465 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 466 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 467 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 468 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 469 struct net_bridge_mdb_entry *
 470 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 471 struct net_bridge_mdb_entry *
 472 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 473                        struct br_ip *group);
 474 void br_multicast_free_pg(struct rcu_head *head);
 475 struct net_bridge_port_group *
 476 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 477                             struct net_bridge_port_group __rcu *next,
 478                             unsigned char state);
 479 void br_mdb_init(void);
 480 void br_mdb_uninit(void);
 481 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 482                    struct br_ip *group, int type);
 483
 484 #define mlock_dereference(X, br) \
 485         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 486
 487 static inline bool br_multicast_is_router(struct net_bridge *br)
 488 {
 489         return br->multicast_router == 2 ||
 490                (br->multicast_router == 1 &&
 491                 timer_pending(&br->multicast_router_timer));
 492 }
 493
 494 static inline bool
 495 __br_multicast_querier_exists(struct net_bridge *br,
 496                               struct bridge_mcast_querier *querier)
 497 {
 498         return time_is_before_jiffies(querier->delay_time) &&
 499                (br->multicast_querier || timer_pending(&querier->timer));
 500 }
 501
 502 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 503                                                struct ethhdr *eth)
 504 {
 505         switch (eth->h_proto) {
 506         case (htons(ETH_P_IP)):
 507                 return __br_multicast_querier_exists(br, &br->ip4_querier);
 508 #if IS_ENABLED(CONFIG_IPV6)
 509         case (htons(ETH_P_IPV6)):
 510                 return __br_multicast_querier_exists(br, &br->ip6_querier);
 511 #endif
 512         default:
 513                 return false;
 514         }
 515 }
 516 #else
 517 static inline int br_multicast_rcv(struct net_bridge *br,
 518                                    struct net_bridge_port *port,
 519                                    struct sk_buff *skb,
 520                                    u16 vid)
 521 {
 522         return 0;
 523 }
 524
 525 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 526                                                       struct sk_buff *skb, u16 vid)
 527 {
 528         return NULL;
 529 }
 530
 531 static inline void br_multicast_add_port(struct net_bridge_port *port)
 532 {
 533 }
 534
 535 static inline void br_multicast_del_port(struct net_bridge_port *port)
 536 {
 537 }
 538
 539 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 540 {
 541 }
 542
 543 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 544 {
 545 }
 546
 547 static inline void br_multicast_init(struct net_bridge *br)
 548 {
 549 }
 550
 551 static inline void br_multicast_open(struct net_bridge *br)
 552 {
 553 }
 554
 555 static inline void br_multicast_stop(struct net_bridge *br)
 556 {
 557 }
 558
 559 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 560                                         struct sk_buff *skb)
 561 {
 562 }
 563
 564 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 565                                         struct sk_buff *skb,
 566                                         struct sk_buff *skb2)
 567 {
 568 }
 569 static inline bool br_multicast_is_router(struct net_bridge *br)
 570 {
 571         return 0;
 572 }
 573 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 574                                                struct ethhdr *eth)
 575 {
 576         return false;
 577 }
 578 static inline void br_mdb_init(void)
 579 {
 580 }
 581 static inline void br_mdb_uninit(void)
 582 {
 583 }
 584 #endif
 585
 586 /* br_vlan.c */
 587 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 588 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 589                         struct sk_buff *skb, u16 *vid);
 590 bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
 591                        const struct sk_buff *skb);
 592 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 593                                const struct net_port_vlans *v,
 594                                struct sk_buff *skb);
 595 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 596 int br_vlan_delete(struct net_bridge *br, u16 vid);
 597 void br_vlan_flush(struct net_bridge *br);
 598 bool br_vlan_find(struct net_bridge *br, u16 vid);
 599 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 600 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 601 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 602 void nbp_vlan_flush(struct net_bridge_port *port);
 603 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 604
 605 static inline struct net_port_vlans *br_get_vlan_info(
 606                                                 const struct net_bridge *br)
 607 {
 608         return rcu_dereference_rtnl(br->vlan_info);
 609 }
 610
 611 static inline struct net_port_vlans *nbp_get_vlan_info(
 612                                                 const struct net_bridge_port *p)
 613 {
 614         return rcu_dereference_rtnl(p->vlan_info);
 615 }
 616
 617 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 618  * skb, the vlan tag will always be present if the frame was tagged.
 619  */
 620 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 621 {
 622         int err = 0;
 623
 624         if (vlan_tx_tag_present(skb))
 625                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 626         else {
 627                 *vid = 0;
 628                 err = -EINVAL;
 629         }
 630
 631         return err;
 632 }
 633
 634 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 635 {
 636         /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
 637          * vid wasn't set
 638          */
 639         smp_rmb();
 640         return v->pvid ?: VLAN_N_VID;
 641 }
 642
 643 static inline int br_vlan_enabled(struct net_bridge *br)
 644 {
 645         return br->vlan_enabled;
 646 }
 647 #else
 648 static inline bool br_allowed_ingress(struct net_bridge *br,
 649                                       struct net_port_vlans *v,
 650                                       struct sk_buff *skb,
 651                                       u16 *vid)
 652 {
 653         return true;
 654 }
 655
 656 static inline bool br_allowed_egress(struct net_bridge *br,
 657                                      const struct net_port_vlans *v,
 658                                      const struct sk_buff *skb)
 659 {
 660         return true;
 661 }
 662
 663 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 664                                              const struct net_port_vlans *v,
 665                                              struct sk_buff *skb)
 666 {
 667         return skb;
 668 }
 669
 670 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 671 {
 672         return -EOPNOTSUPP;
 673 }
 674
 675 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 676 {
 677         return -EOPNOTSUPP;
 678 }
 679
 680 static inline void br_vlan_flush(struct net_bridge *br)
 681 {
 682 }
 683
 684 static inline bool br_vlan_find(struct net_bridge *br, u16 vid)
 685 {
 686         return false;
 687 }
 688
 689 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 690 {
 691         return -EOPNOTSUPP;
 692 }
 693
 694 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 695 {
 696         return -EOPNOTSUPP;
 697 }
 698
 699 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 700 {
 701 }
 702
 703 static inline struct net_port_vlans *br_get_vlan_info(
 704                                                 const struct net_bridge *br)
 705 {
 706         return NULL;
 707 }
 708 static inline struct net_port_vlans *nbp_get_vlan_info(
 709                                                 const struct net_bridge_port *p)
 710 {
 711         return NULL;
 712 }
 713
 714 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 715 {
 716         return false;
 717 }
 718
 719 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 720 {
 721         return 0;
 722 }
 723 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 724 {
 725         return VLAN_N_VID;      /* Returns invalid vid */
 726 }
 727
 728 static inline int br_vlan_enabled(struct net_bridge *br)
 729 {
 730         return 0;
 731 }
 732 #endif
 733
 734 /* br_netfilter.c */
 735 #ifdef CONFIG_BRIDGE_NETFILTER
 736 int br_netfilter_init(void);
 737 void br_netfilter_fini(void);
 738 void br_netfilter_rtable_init(struct net_bridge *);
 739 #else
 740 #define br_netfilter_init()     (0)
 741 #define br_netfilter_fini()     do { } while (0)
 742 #define br_netfilter_rtable_init(x)
 743 #endif
 744
 745 /* br_stp.c */
 746 void br_log_state(const struct net_bridge_port *p);
 747 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 748 void br_init_port(struct net_bridge_port *p);
 749 void br_become_designated_port(struct net_bridge_port *p);
 750
 751 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 752 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 753 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 754 int br_set_max_age(struct net_bridge *br, unsigned long x);
 755
 756
 757 /* br_stp_if.c */
 758 void br_stp_enable_bridge(struct net_bridge *br);
 759 void br_stp_disable_bridge(struct net_bridge *br);
 760 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 761 void br_stp_enable_port(struct net_bridge_port *p);
 762 void br_stp_disable_port(struct net_bridge_port *p);
 763 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 764 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 765 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 766 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 767 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 768 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 769
 770 /* br_stp_bpdu.c */
 771 struct stp_proto;
 772 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 773                 struct net_device *dev);
 774
 775 /* br_stp_timer.c */
 776 void br_stp_timer_init(struct net_bridge *br);
 777 void br_stp_port_timer_init(struct net_bridge_port *p);
 778 unsigned long br_timer_value(const struct timer_list *timer);
 779
 780 /* br.c */
 781 #if IS_ENABLED(CONFIG_ATM_LANE)
 782 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 783 #endif
 784
 785 /* br_netlink.c */
 786 extern struct rtnl_link_ops br_link_ops;
 787 int br_netlink_init(void);
 788 void br_netlink_fini(void);
 789 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 790 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 791 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 792 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 793                u32 filter_mask);
 794
 795 #ifdef CONFIG_SYSFS
 796 /* br_sysfs_if.c */
 797 extern const struct sysfs_ops brport_sysfs_ops;
 798 int br_sysfs_addif(struct net_bridge_port *p);
 799 int br_sysfs_renameif(struct net_bridge_port *p);
 800
 801 /* br_sysfs_br.c */
 802 int br_sysfs_addbr(struct net_device *dev);
 803 void br_sysfs_delbr(struct net_device *dev);
 804
 805 #else
 806
 807 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 808 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 809 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 810 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 811 #endif /* CONFIG_SYSFS */
 812
 813 #endif