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 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
  39 #define BR_GROUPFWD_8021AD      0xB801u
  40
  41 /* Path to usermode spanning tree program */
  42 #define BR_STP_PROG     "/sbin/bridge-stp"
  43
  44 typedef struct bridge_id bridge_id;
  45 typedef struct mac_addr mac_addr;
  46 typedef __u16 port_id;
  47
  48 struct bridge_id
  49 {
  50         unsigned char   prio[2];
  51         unsigned char   addr[ETH_ALEN];
  52 };
  53
  54 struct mac_addr
  55 {
  56         unsigned char   addr[ETH_ALEN];
  57 };
  58
  59 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  60 /* our own querier */
  61 struct bridge_mcast_own_query {
  62         struct timer_list       timer;
  63         u32                     startup_sent;
  64 };
  65
  66 /* other querier */
  67 struct bridge_mcast_other_query {
  68         struct timer_list               timer;
  69         unsigned long                   delay_time;
  70 };
  71
  72 /* selected querier */
  73 struct bridge_mcast_querier {
  74         struct br_ip addr;
  75         struct net_bridge_port __rcu    *port;
  76 };
  77 #endif
  78
  79 struct net_port_vlans {
  80         u16                             port_idx;
  81         u16                             pvid;
  82         union {
  83                 struct net_bridge_port          *port;
  84                 struct net_bridge               *br;
  85         }                               parent;
  86         struct rcu_head                 rcu;
  87         unsigned long                   vlan_bitmap[BR_VLAN_BITMAP_LEN];
  88         unsigned long                   untagged_bitmap[BR_VLAN_BITMAP_LEN];
  89         u16                             num_vlans;
  90 };
  91
  92 struct net_bridge_fdb_entry
  93 {
  94         struct hlist_node               hlist;
  95         struct net_bridge_port          *dst;
  96
  97         struct rcu_head                 rcu;
  98         unsigned long                   updated;
  99         unsigned long                   used;
 100         mac_addr                        addr;
 101         unsigned char                   is_local:1,
 102                                         is_static:1,
 103                                         added_by_user:1,
 104                                         added_by_external_learn:1;
 105         __u16                           vlan_id;
 106 };
 107
 108 struct net_bridge_port_group {
 109         struct net_bridge_port          *port;
 110         struct net_bridge_port_group __rcu *next;
 111         struct hlist_node               mglist;
 112         struct rcu_head                 rcu;
 113         struct timer_list               timer;
 114         struct br_ip                    addr;
 115         unsigned char                   state;
 116 };
 117
 118 struct net_bridge_mdb_entry
 119 {
 120         struct hlist_node               hlist[2];
 121         struct net_bridge               *br;
 122         struct net_bridge_port_group __rcu *ports;
 123         struct rcu_head                 rcu;
 124         struct timer_list               timer;
 125         struct br_ip                    addr;
 126         bool                            mglist;
 127 };
 128
 129 struct net_bridge_mdb_htable
 130 {
 131         struct hlist_head               *mhash;
 132         struct rcu_head                 rcu;
 133         struct net_bridge_mdb_htable    *old;
 134         u32                             size;
 135         u32                             max;
 136         u32                             secret;
 137         u32                             ver;
 138 };
 139
 140 struct net_bridge_port
 141 {
 142         struct net_bridge               *br;
 143         struct net_device               *dev;
 144         struct list_head                list;
 145
 146         /* STP */
 147         u8                              priority;
 148         u8                              state;
 149         u16                             port_no;
 150         unsigned char                   topology_change_ack;
 151         unsigned char                   config_pending;
 152         port_id                         port_id;
 153         port_id                         designated_port;
 154         bridge_id                       designated_root;
 155         bridge_id                       designated_bridge;
 156         u32                             path_cost;
 157         u32                             designated_cost;
 158         unsigned long                   designated_age;
 159
 160         struct timer_list               forward_delay_timer;
 161         struct timer_list               hold_timer;
 162         struct timer_list               message_age_timer;
 163         struct kobject                  kobj;
 164         struct rcu_head                 rcu;
 165
 166         unsigned long                   flags;
 167 #define BR_HAIRPIN_MODE         0x00000001
 168 #define BR_BPDU_GUARD           0x00000002
 169 #define BR_ROOT_BLOCK           0x00000004
 170 #define BR_MULTICAST_FAST_LEAVE 0x00000008
 171 #define BR_ADMIN_COST           0x00000010
 172 #define BR_LEARNING             0x00000020
 173 #define BR_FLOOD                0x00000040
 174 #define BR_AUTO_MASK (BR_FLOOD | BR_LEARNING)
 175 #define BR_PROMISC              0x00000080
 176 #define BR_PROXYARP             0x00000100
 177
 178 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 179         struct bridge_mcast_own_query   ip4_own_query;
 180 #if IS_ENABLED(CONFIG_IPV6)
 181         struct bridge_mcast_own_query   ip6_own_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_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 202 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 203
 204 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 205
 206 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 207 {
 208         return rcu_dereference(dev->rx_handler_data);
 209 }
 210
 211 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 212 {
 213         return br_port_exists(dev) ?
 214                 rtnl_dereference(dev->rx_handler_data) : NULL;
 215 }
 216
 217 struct net_bridge
 218 {
 219         spinlock_t                      lock;
 220         struct list_head                port_list;
 221         struct net_device               *dev;
 222
 223         struct pcpu_sw_netstats         __percpu *stats;
 224         spinlock_t                      hash_lock;
 225         struct hlist_head               hash[BR_HASH_SIZE];
 226 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 227         struct rtable                   fake_rtable;
 228         bool                            nf_call_iptables;
 229         bool                            nf_call_ip6tables;
 230         bool                            nf_call_arptables;
 231 #endif
 232         u16                             group_fwd_mask;
 233         u16                             group_fwd_mask_required;
 234
 235         /* STP */
 236         bridge_id                       designated_root;
 237         bridge_id                       bridge_id;
 238         u32                             root_path_cost;
 239         unsigned long                   max_age;
 240         unsigned long                   hello_time;
 241         unsigned long                   forward_delay;
 242         unsigned long                   bridge_max_age;
 243         unsigned long                   ageing_time;
 244         unsigned long                   bridge_hello_time;
 245         unsigned long                   bridge_forward_delay;
 246
 247         u8                              group_addr[ETH_ALEN];
 248         bool                            group_addr_set;
 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_other_query ip4_other_query;
 286         struct bridge_mcast_own_query   ip4_own_query;
 287         struct bridge_mcast_querier     ip4_querier;
 288 #if IS_ENABLED(CONFIG_IPV6)
 289         struct bridge_mcast_other_query ip6_other_query;
 290         struct bridge_mcast_own_query   ip6_own_query;
 291         struct bridge_mcast_querier     ip6_querier;
 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         u32                             auto_cnt;
 301 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 302         u8                              vlan_enabled;
 303         __be16                          vlan_proto;
 304         u16                             default_pvid;
 305         struct net_port_vlans __rcu     *vlan_info;
 306 #endif
 307 };
 308
 309 struct br_input_skb_cb {
 310         struct net_device *brdev;
 311
 312 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 313         int igmp;
 314         int mrouters_only;
 315 #endif
 316
 317         u16 frag_max_size;
 318
 319 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 320         bool vlan_filtered;
 321 #endif
 322 };
 323
 324 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 325
 326 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 327 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 328 #else
 329 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 330 #endif
 331
 332 #define br_printk(level, br, format, args...)   \
 333         printk(level "%s: " format, (br)->dev->name, ##args)
 334
 335 #define br_err(__br, format, args...)                   \
 336         br_printk(KERN_ERR, __br, format, ##args)
 337 #define br_warn(__br, format, args...)                  \
 338         br_printk(KERN_WARNING, __br, format, ##args)
 339 #define br_notice(__br, format, args...)                \
 340         br_printk(KERN_NOTICE, __br, format, ##args)
 341 #define br_info(__br, format, args...)                  \
 342         br_printk(KERN_INFO, __br, format, ##args)
 343
 344 #define br_debug(br, format, args...)                   \
 345         pr_debug("%s: " format,  (br)->dev->name, ##args)
 346
 347 /* called under bridge lock */
 348 static inline int br_is_root_bridge(const struct net_bridge *br)
 349 {
 350         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 351 }
 352
 353 /* br_device.c */
 354 void br_dev_setup(struct net_device *dev);
 355 void br_dev_delete(struct net_device *dev, struct list_head *list);
 356 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 357 #ifdef CONFIG_NET_POLL_CONTROLLER
 358 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 359                                        struct sk_buff *skb)
 360 {
 361         struct netpoll *np = p->np;
 362
 363         if (np)
 364                 netpoll_send_skb(np, skb);
 365 }
 366
 367 int br_netpoll_enable(struct net_bridge_port *p);
 368 void br_netpoll_disable(struct net_bridge_port *p);
 369 #else
 370 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 371                                        struct sk_buff *skb)
 372 {
 373 }
 374
 375 static inline int br_netpoll_enable(struct net_bridge_port *p)
 376 {
 377         return 0;
 378 }
 379
 380 static inline void br_netpoll_disable(struct net_bridge_port *p)
 381 {
 382 }
 383 #endif
 384
 385 /* br_fdb.c */
 386 int br_fdb_init(void);
 387 void br_fdb_fini(void);
 388 void br_fdb_flush(struct net_bridge *br);
 389 void br_fdb_find_delete_local(struct net_bridge *br,
 390                               const struct net_bridge_port *p,
 391                               const unsigned char *addr, u16 vid);
 392 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 393 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 394 void br_fdb_cleanup(unsigned long arg);
 395 void br_fdb_delete_by_port(struct net_bridge *br,
 396                            const struct net_bridge_port *p, int do_all);
 397 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 398                                           const unsigned char *addr, __u16 vid);
 399 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 400 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 401                    unsigned long off);
 402 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 403                   const unsigned char *addr, u16 vid);
 404 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 405                    const unsigned char *addr, u16 vid, bool added_by_user);
 406
 407 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 408                   struct net_device *dev, const unsigned char *addr, u16 vid);
 409 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 410                const unsigned char *addr, u16 vid, u16 nlh_flags);
 411 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 412                 struct net_device *dev, struct net_device *fdev, int idx);
 413 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 414 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 415
 416 /* br_forward.c */
 417 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 418 int br_dev_queue_push_xmit(struct sk_buff *skb);
 419 void br_forward(const struct net_bridge_port *to,
 420                 struct sk_buff *skb, struct sk_buff *skb0);
 421 int br_forward_finish(struct sk_buff *skb);
 422 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 423 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 424                       struct sk_buff *skb2, bool unicast);
 425
 426 /* br_if.c */
 427 void br_port_carrier_check(struct net_bridge_port *p);
 428 int br_add_bridge(struct net *net, const char *name);
 429 int br_del_bridge(struct net *net, const char *name);
 430 int br_add_if(struct net_bridge *br, struct net_device *dev);
 431 int br_del_if(struct net_bridge *br, struct net_device *dev);
 432 int br_min_mtu(const struct net_bridge *br);
 433 netdev_features_t br_features_recompute(struct net_bridge *br,
 434                                         netdev_features_t features);
 435 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 436 void br_manage_promisc(struct net_bridge *br);
 437
 438 /* br_input.c */
 439 int br_handle_frame_finish(struct sk_buff *skb);
 440 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 441
 442 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 443 {
 444         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 445 }
 446
 447 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 448 {
 449         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 450 }
 451
 452 /* br_ioctl.c */
 453 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 454 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 455                              void __user *arg);
 456
 457 /* br_multicast.c */
 458 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 459 extern unsigned int br_mdb_rehash_seq;
 460 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 461                      struct sk_buff *skb, u16 vid);
 462 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 463                                         struct sk_buff *skb, u16 vid);
 464 void br_multicast_add_port(struct net_bridge_port *port);
 465 void br_multicast_del_port(struct net_bridge_port *port);
 466 void br_multicast_enable_port(struct net_bridge_port *port);
 467 void br_multicast_disable_port(struct net_bridge_port *port);
 468 void br_multicast_init(struct net_bridge *br);
 469 void br_multicast_open(struct net_bridge *br);
 470 void br_multicast_stop(struct net_bridge *br);
 471 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 472                           struct sk_buff *skb);
 473 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 474                           struct sk_buff *skb, struct sk_buff *skb2);
 475 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 476 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 477 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 478 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 479 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 480 struct net_bridge_mdb_entry *
 481 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 482 struct net_bridge_mdb_entry *
 483 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 484                        struct br_ip *group);
 485 void br_multicast_free_pg(struct rcu_head *head);
 486 struct net_bridge_port_group *
 487 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 488                             struct net_bridge_port_group __rcu *next,
 489                             unsigned char state);
 490 void br_mdb_init(void);
 491 void br_mdb_uninit(void);
 492 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 493                    struct br_ip *group, int type);
 494
 495 #define mlock_dereference(X, br) \
 496         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 497
 498 static inline bool br_multicast_is_router(struct net_bridge *br)
 499 {
 500         return br->multicast_router == 2 ||
 501                (br->multicast_router == 1 &&
 502                 timer_pending(&br->multicast_router_timer));
 503 }
 504
 505 static inline bool
 506 __br_multicast_querier_exists(struct net_bridge *br,
 507                               struct bridge_mcast_other_query *querier)
 508 {
 509         return time_is_before_jiffies(querier->delay_time) &&
 510                (br->multicast_querier || timer_pending(&querier->timer));
 511 }
 512
 513 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 514                                                struct ethhdr *eth)
 515 {
 516         switch (eth->h_proto) {
 517         case (htons(ETH_P_IP)):
 518                 return __br_multicast_querier_exists(br, &br->ip4_other_query);
 519 #if IS_ENABLED(CONFIG_IPV6)
 520         case (htons(ETH_P_IPV6)):
 521                 return __br_multicast_querier_exists(br, &br->ip6_other_query);
 522 #endif
 523         default:
 524                 return false;
 525         }
 526 }
 527 #else
 528 static inline int br_multicast_rcv(struct net_bridge *br,
 529                                    struct net_bridge_port *port,
 530                                    struct sk_buff *skb,
 531                                    u16 vid)
 532 {
 533         return 0;
 534 }
 535
 536 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 537                                                       struct sk_buff *skb, u16 vid)
 538 {
 539         return NULL;
 540 }
 541
 542 static inline void br_multicast_add_port(struct net_bridge_port *port)
 543 {
 544 }
 545
 546 static inline void br_multicast_del_port(struct net_bridge_port *port)
 547 {
 548 }
 549
 550 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 551 {
 552 }
 553
 554 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 555 {
 556 }
 557
 558 static inline void br_multicast_init(struct net_bridge *br)
 559 {
 560 }
 561
 562 static inline void br_multicast_open(struct net_bridge *br)
 563 {
 564 }
 565
 566 static inline void br_multicast_stop(struct net_bridge *br)
 567 {
 568 }
 569
 570 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 571                                         struct sk_buff *skb)
 572 {
 573 }
 574
 575 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 576                                         struct sk_buff *skb,
 577                                         struct sk_buff *skb2)
 578 {
 579 }
 580 static inline bool br_multicast_is_router(struct net_bridge *br)
 581 {
 582         return 0;
 583 }
 584 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 585                                                struct ethhdr *eth)
 586 {
 587         return false;
 588 }
 589 static inline void br_mdb_init(void)
 590 {
 591 }
 592 static inline void br_mdb_uninit(void)
 593 {
 594 }
 595 #endif
 596
 597 /* br_vlan.c */
 598 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 599 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 600                         struct sk_buff *skb, u16 *vid);
 601 bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
 602                        const struct sk_buff *skb);
 603 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 604 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 605                                const struct net_port_vlans *v,
 606                                struct sk_buff *skb);
 607 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 608 int br_vlan_delete(struct net_bridge *br, u16 vid);
 609 void br_vlan_flush(struct net_bridge *br);
 610 bool br_vlan_find(struct net_bridge *br, u16 vid);
 611 void br_recalculate_fwd_mask(struct net_bridge *br);
 612 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 613 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 614 int br_vlan_init(struct net_bridge *br);
 615 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 616 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 617 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 618 void nbp_vlan_flush(struct net_bridge_port *port);
 619 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 620 int nbp_vlan_init(struct net_bridge_port *port);
 621
 622 static inline struct net_port_vlans *br_get_vlan_info(
 623                                                 const struct net_bridge *br)
 624 {
 625         return rcu_dereference_rtnl(br->vlan_info);
 626 }
 627
 628 static inline struct net_port_vlans *nbp_get_vlan_info(
 629                                                 const struct net_bridge_port *p)
 630 {
 631         return rcu_dereference_rtnl(p->vlan_info);
 632 }
 633
 634 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 635  * skb, the vlan tag will always be present if the frame was tagged.
 636  */
 637 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 638 {
 639         int err = 0;
 640
 641         if (vlan_tx_tag_present(skb))
 642                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 643         else {
 644                 *vid = 0;
 645                 err = -EINVAL;
 646         }
 647
 648         return err;
 649 }
 650
 651 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 652 {
 653         if (!v)
 654                 return 0;
 655
 656         smp_rmb();
 657         return v->pvid;
 658 }
 659
 660 static inline int br_vlan_enabled(struct net_bridge *br)
 661 {
 662         return br->vlan_enabled;
 663 }
 664 #else
 665 static inline bool br_allowed_ingress(struct net_bridge *br,
 666                                       struct net_port_vlans *v,
 667                                       struct sk_buff *skb,
 668                                       u16 *vid)
 669 {
 670         return true;
 671 }
 672
 673 static inline bool br_allowed_egress(struct net_bridge *br,
 674                                      const struct net_port_vlans *v,
 675                                      const struct sk_buff *skb)
 676 {
 677         return true;
 678 }
 679
 680 static inline bool br_should_learn(struct net_bridge_port *p,
 681                                    struct sk_buff *skb, u16 *vid)
 682 {
 683         return true;
 684 }
 685
 686 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 687                                              const struct net_port_vlans *v,
 688                                              struct sk_buff *skb)
 689 {
 690         return skb;
 691 }
 692
 693 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 694 {
 695         return -EOPNOTSUPP;
 696 }
 697
 698 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 699 {
 700         return -EOPNOTSUPP;
 701 }
 702
 703 static inline void br_vlan_flush(struct net_bridge *br)
 704 {
 705 }
 706
 707 static inline bool br_vlan_find(struct net_bridge *br, u16 vid)
 708 {
 709         return false;
 710 }
 711
 712 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 713 {
 714 }
 715
 716 static inline int br_vlan_init(struct net_bridge *br)
 717 {
 718         return 0;
 719 }
 720
 721 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 722 {
 723         return -EOPNOTSUPP;
 724 }
 725
 726 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 727 {
 728         return -EOPNOTSUPP;
 729 }
 730
 731 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 732 {
 733 }
 734
 735 static inline struct net_port_vlans *br_get_vlan_info(
 736                                                 const struct net_bridge *br)
 737 {
 738         return NULL;
 739 }
 740 static inline struct net_port_vlans *nbp_get_vlan_info(
 741                                                 const struct net_bridge_port *p)
 742 {
 743         return NULL;
 744 }
 745
 746 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 747 {
 748         return false;
 749 }
 750
 751 static inline int nbp_vlan_init(struct net_bridge_port *port)
 752 {
 753         return 0;
 754 }
 755
 756 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 757 {
 758         return 0;
 759 }
 760 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 761 {
 762         return 0;
 763 }
 764
 765 static inline int br_vlan_enabled(struct net_bridge *br)
 766 {
 767         return 0;
 768 }
 769 #endif
 770
 771 /* br_netfilter.c */
 772 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 773 int br_nf_core_init(void);
 774 void br_nf_core_fini(void);
 775 void br_netfilter_rtable_init(struct net_bridge *);
 776 #else
 777 static inline int br_nf_core_init(void) { return 0; }
 778 static inline void br_nf_core_fini(void) {}
 779 #define br_netfilter_rtable_init(x)
 780 #endif
 781
 782 /* br_stp.c */
 783 void br_log_state(const struct net_bridge_port *p);
 784 void br_set_state(struct net_bridge_port *p, unsigned int state);
 785 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 786 void br_init_port(struct net_bridge_port *p);
 787 void br_become_designated_port(struct net_bridge_port *p);
 788
 789 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 790 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 791 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 792 int br_set_max_age(struct net_bridge *br, unsigned long x);
 793
 794
 795 /* br_stp_if.c */
 796 void br_stp_enable_bridge(struct net_bridge *br);
 797 void br_stp_disable_bridge(struct net_bridge *br);
 798 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 799 void br_stp_enable_port(struct net_bridge_port *p);
 800 void br_stp_disable_port(struct net_bridge_port *p);
 801 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 802 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 803 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 804 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 805 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 806 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 807
 808 /* br_stp_bpdu.c */
 809 struct stp_proto;
 810 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 811                 struct net_device *dev);
 812
 813 /* br_stp_timer.c */
 814 void br_stp_timer_init(struct net_bridge *br);
 815 void br_stp_port_timer_init(struct net_bridge_port *p);
 816 unsigned long br_timer_value(const struct timer_list *timer);
 817
 818 /* br.c */
 819 #if IS_ENABLED(CONFIG_ATM_LANE)
 820 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 821 #endif
 822
 823 /* br_netlink.c */
 824 extern struct rtnl_link_ops br_link_ops;
 825 int br_netlink_init(void);
 826 void br_netlink_fini(void);
 827 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 828 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 829 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 830 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 831                u32 filter_mask);
 832
 833 #ifdef CONFIG_SYSFS
 834 /* br_sysfs_if.c */
 835 extern const struct sysfs_ops brport_sysfs_ops;
 836 int br_sysfs_addif(struct net_bridge_port *p);
 837 int br_sysfs_renameif(struct net_bridge_port *p);
 838
 839 /* br_sysfs_br.c */
 840 int br_sysfs_addbr(struct net_device *dev);
 841 void br_sysfs_delbr(struct net_device *dev);
 842
 843 #else
 844
 845 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 846 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 847 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 848 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 849 #endif /* CONFIG_SYSFS */
 850
 851 #endif