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 extern struct notifier_block br_device_notifier;
 337
 338 /* called under bridge lock */
 339 static inline int br_is_root_bridge(const struct net_bridge *br)
 340 {
 341         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 342 }
 343
 344 /* br_device.c */
 345 void br_dev_setup(struct net_device *dev);
 346 void br_dev_delete(struct net_device *dev, struct list_head *list);
 347 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 348 #ifdef CONFIG_NET_POLL_CONTROLLER
 349 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 350                                        struct sk_buff *skb)
 351 {
 352         struct netpoll *np = p->np;
 353
 354         if (np)
 355                 netpoll_send_skb(np, skb);
 356 }
 357
 358 int br_netpoll_enable(struct net_bridge_port *p);
 359 void br_netpoll_disable(struct net_bridge_port *p);
 360 #else
 361 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 362                                        struct sk_buff *skb)
 363 {
 364 }
 365
 366 static inline int br_netpoll_enable(struct net_bridge_port *p)
 367 {
 368         return 0;
 369 }
 370
 371 static inline void br_netpoll_disable(struct net_bridge_port *p)
 372 {
 373 }
 374 #endif
 375
 376 /* br_fdb.c */
 377 int br_fdb_init(void);
 378 void br_fdb_fini(void);
 379 void br_fdb_flush(struct net_bridge *br);
 380 void br_fdb_find_delete_local(struct net_bridge *br,
 381                               const struct net_bridge_port *p,
 382                               const unsigned char *addr, u16 vid);
 383 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 384 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 385 void br_fdb_cleanup(unsigned long arg);
 386 void br_fdb_delete_by_port(struct net_bridge *br,
 387                            const struct net_bridge_port *p, int do_all);
 388 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 389                                           const unsigned char *addr, __u16 vid);
 390 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 391 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 392                    unsigned long off);
 393 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 394                   const unsigned char *addr, u16 vid);
 395 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 396                    const unsigned char *addr, u16 vid, bool added_by_user);
 397
 398 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 399                   struct net_device *dev, const unsigned char *addr);
 400 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 401                const unsigned char *addr, u16 nlh_flags);
 402 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 403                 struct net_device *dev, int idx);
 404 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 405 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 406
 407 /* br_forward.c */
 408 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 409 int br_dev_queue_push_xmit(struct sk_buff *skb);
 410 void br_forward(const struct net_bridge_port *to,
 411                 struct sk_buff *skb, struct sk_buff *skb0);
 412 int br_forward_finish(struct sk_buff *skb);
 413 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 414 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 415                       struct sk_buff *skb2, bool unicast);
 416
 417 /* br_if.c */
 418 void br_port_carrier_check(struct net_bridge_port *p);
 419 int br_add_bridge(struct net *net, const char *name);
 420 int br_del_bridge(struct net *net, const char *name);
 421 int br_add_if(struct net_bridge *br, struct net_device *dev);
 422 int br_del_if(struct net_bridge *br, struct net_device *dev);
 423 int br_min_mtu(const struct net_bridge *br);
 424 netdev_features_t br_features_recompute(struct net_bridge *br,
 425                                         netdev_features_t features);
 426 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 427 void br_manage_promisc(struct net_bridge *br);
 428
 429 /* br_input.c */
 430 int br_handle_frame_finish(struct sk_buff *skb);
 431 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 432
 433 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 434 {
 435         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 436 }
 437
 438 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 439 {
 440         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 441 }
 442
 443 /* br_ioctl.c */
 444 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 445 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 446                              void __user *arg);
 447
 448 /* br_multicast.c */
 449 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 450 extern unsigned int br_mdb_rehash_seq;
 451 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 452                      struct sk_buff *skb, u16 vid);
 453 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 454                                         struct sk_buff *skb, u16 vid);
 455 void br_multicast_add_port(struct net_bridge_port *port);
 456 void br_multicast_del_port(struct net_bridge_port *port);
 457 void br_multicast_enable_port(struct net_bridge_port *port);
 458 void br_multicast_disable_port(struct net_bridge_port *port);
 459 void br_multicast_init(struct net_bridge *br);
 460 void br_multicast_open(struct net_bridge *br);
 461 void br_multicast_stop(struct net_bridge *br);
 462 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 463                           struct sk_buff *skb);
 464 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 465                           struct sk_buff *skb, struct sk_buff *skb2);
 466 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 467 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 468 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 469 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 470 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 471 struct net_bridge_mdb_entry *
 472 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 473 struct net_bridge_mdb_entry *
 474 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 475                        struct br_ip *group);
 476 void br_multicast_free_pg(struct rcu_head *head);
 477 struct net_bridge_port_group *
 478 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 479                             struct net_bridge_port_group __rcu *next,
 480                             unsigned char state);
 481 void br_mdb_init(void);
 482 void br_mdb_uninit(void);
 483 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 484                    struct br_ip *group, int type);
 485
 486 #define mlock_dereference(X, br) \
 487         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 488
 489 static inline bool br_multicast_is_router(struct net_bridge *br)
 490 {
 491         return br->multicast_router == 2 ||
 492                (br->multicast_router == 1 &&
 493                 timer_pending(&br->multicast_router_timer));
 494 }
 495
 496 static inline bool
 497 __br_multicast_querier_exists(struct net_bridge *br,
 498                               struct bridge_mcast_querier *querier)
 499 {
 500         return time_is_before_jiffies(querier->delay_time) &&
 501                (br->multicast_querier || timer_pending(&querier->timer));
 502 }
 503
 504 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 505                                                struct ethhdr *eth)
 506 {
 507         switch (eth->h_proto) {
 508         case (htons(ETH_P_IP)):
 509                 return __br_multicast_querier_exists(br, &br->ip4_querier);
 510 #if IS_ENABLED(CONFIG_IPV6)
 511         case (htons(ETH_P_IPV6)):
 512                 return __br_multicast_querier_exists(br, &br->ip6_querier);
 513 #endif
 514         default:
 515                 return false;
 516         }
 517 }
 518 #else
 519 static inline int br_multicast_rcv(struct net_bridge *br,
 520                                    struct net_bridge_port *port,
 521                                    struct sk_buff *skb,
 522                                    u16 vid)
 523 {
 524         return 0;
 525 }
 526
 527 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 528                                                       struct sk_buff *skb, u16 vid)
 529 {
 530         return NULL;
 531 }
 532
 533 static inline void br_multicast_add_port(struct net_bridge_port *port)
 534 {
 535 }
 536
 537 static inline void br_multicast_del_port(struct net_bridge_port *port)
 538 {
 539 }
 540
 541 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 542 {
 543 }
 544
 545 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 546 {
 547 }
 548
 549 static inline void br_multicast_init(struct net_bridge *br)
 550 {
 551 }
 552
 553 static inline void br_multicast_open(struct net_bridge *br)
 554 {
 555 }
 556
 557 static inline void br_multicast_stop(struct net_bridge *br)
 558 {
 559 }
 560
 561 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 562                                         struct sk_buff *skb)
 563 {
 564 }
 565
 566 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 567                                         struct sk_buff *skb,
 568                                         struct sk_buff *skb2)
 569 {
 570 }
 571 static inline bool br_multicast_is_router(struct net_bridge *br)
 572 {
 573         return 0;
 574 }
 575 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 576                                                struct ethhdr *eth)
 577 {
 578         return false;
 579 }
 580 static inline void br_mdb_init(void)
 581 {
 582 }
 583 static inline void br_mdb_uninit(void)
 584 {
 585 }
 586 #endif
 587
 588 /* br_vlan.c */
 589 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 590 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 591                         struct sk_buff *skb, u16 *vid);
 592 bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
 593                        const struct sk_buff *skb);
 594 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 595                                const struct net_port_vlans *v,
 596                                struct sk_buff *skb);
 597 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 598 int br_vlan_delete(struct net_bridge *br, u16 vid);
 599 void br_vlan_flush(struct net_bridge *br);
 600 bool br_vlan_find(struct net_bridge *br, u16 vid);
 601 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 602 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 603 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 604 void nbp_vlan_flush(struct net_bridge_port *port);
 605 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 606
 607 static inline struct net_port_vlans *br_get_vlan_info(
 608                                                 const struct net_bridge *br)
 609 {
 610         return rcu_dereference_rtnl(br->vlan_info);
 611 }
 612
 613 static inline struct net_port_vlans *nbp_get_vlan_info(
 614                                                 const struct net_bridge_port *p)
 615 {
 616         return rcu_dereference_rtnl(p->vlan_info);
 617 }
 618
 619 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 620  * skb, the vlan tag will always be present if the frame was tagged.
 621  */
 622 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 623 {
 624         int err = 0;
 625
 626         if (vlan_tx_tag_present(skb))
 627                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 628         else {
 629                 *vid = 0;
 630                 err = -EINVAL;
 631         }
 632
 633         return err;
 634 }
 635
 636 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 637 {
 638         /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
 639          * vid wasn't set
 640          */
 641         smp_rmb();
 642         return v->pvid ?: VLAN_N_VID;
 643 }
 644
 645 static inline int br_vlan_enabled(struct net_bridge *br)
 646 {
 647         return br->vlan_enabled;
 648 }
 649 #else
 650 static inline bool br_allowed_ingress(struct net_bridge *br,
 651                                       struct net_port_vlans *v,
 652                                       struct sk_buff *skb,
 653                                       u16 *vid)
 654 {
 655         return true;
 656 }
 657
 658 static inline bool br_allowed_egress(struct net_bridge *br,
 659                                      const struct net_port_vlans *v,
 660                                      const struct sk_buff *skb)
 661 {
 662         return true;
 663 }
 664
 665 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 666                                              const struct net_port_vlans *v,
 667                                              struct sk_buff *skb)
 668 {
 669         return skb;
 670 }
 671
 672 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 673 {
 674         return -EOPNOTSUPP;
 675 }
 676
 677 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 678 {
 679         return -EOPNOTSUPP;
 680 }
 681
 682 static inline void br_vlan_flush(struct net_bridge *br)
 683 {
 684 }
 685
 686 static inline bool br_vlan_find(struct net_bridge *br, u16 vid)
 687 {
 688         return false;
 689 }
 690
 691 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 692 {
 693         return -EOPNOTSUPP;
 694 }
 695
 696 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 697 {
 698         return -EOPNOTSUPP;
 699 }
 700
 701 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 702 {
 703 }
 704
 705 static inline struct net_port_vlans *br_get_vlan_info(
 706                                                 const struct net_bridge *br)
 707 {
 708         return NULL;
 709 }
 710 static inline struct net_port_vlans *nbp_get_vlan_info(
 711                                                 const struct net_bridge_port *p)
 712 {
 713         return NULL;
 714 }
 715
 716 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 717 {
 718         return false;
 719 }
 720
 721 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 722 {
 723         return 0;
 724 }
 725 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 726 {
 727         return VLAN_N_VID;      /* Returns invalid vid */
 728 }
 729
 730 static inline int br_vlan_enabled(struct net_bridge *br);
 731 {
 732         return 0;
 733 }
 734 #endif
 735
 736 /* br_netfilter.c */
 737 #ifdef CONFIG_BRIDGE_NETFILTER
 738 int br_netfilter_init(void);
 739 void br_netfilter_fini(void);
 740 void br_netfilter_rtable_init(struct net_bridge *);
 741 #else
 742 #define br_netfilter_init()     (0)
 743 #define br_netfilter_fini()     do { } while (0)
 744 #define br_netfilter_rtable_init(x)
 745 #endif
 746
 747 /* br_stp.c */
 748 void br_log_state(const struct net_bridge_port *p);
 749 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 750 void br_init_port(struct net_bridge_port *p);
 751 void br_become_designated_port(struct net_bridge_port *p);
 752
 753 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 754 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 755 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 756 int br_set_max_age(struct net_bridge *br, unsigned long x);
 757
 758
 759 /* br_stp_if.c */
 760 void br_stp_enable_bridge(struct net_bridge *br);
 761 void br_stp_disable_bridge(struct net_bridge *br);
 762 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 763 void br_stp_enable_port(struct net_bridge_port *p);
 764 void br_stp_disable_port(struct net_bridge_port *p);
 765 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 766 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 767 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 768 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 769 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 770 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 771
 772 /* br_stp_bpdu.c */
 773 struct stp_proto;
 774 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 775                 struct net_device *dev);
 776
 777 /* br_stp_timer.c */
 778 void br_stp_timer_init(struct net_bridge *br);
 779 void br_stp_port_timer_init(struct net_bridge_port *p);
 780 unsigned long br_timer_value(const struct timer_list *timer);
 781
 782 /* br.c */
 783 #if IS_ENABLED(CONFIG_ATM_LANE)
 784 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 785 #endif
 786
 787 /* br_netlink.c */
 788 extern struct rtnl_link_ops br_link_ops;
 789 int br_netlink_init(void);
 790 void br_netlink_fini(void);
 791 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 792 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 793 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 794 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 795                u32 filter_mask);
 796
 797 #ifdef CONFIG_SYSFS
 798 /* br_sysfs_if.c */
 799 extern const struct sysfs_ops brport_sysfs_ops;
 800 int br_sysfs_addif(struct net_bridge_port *p);
 801 int br_sysfs_renameif(struct net_bridge_port *p);
 802
 803 /* br_sysfs_br.c */
 804 int br_sysfs_addbr(struct net_device *dev);
 805 void br_sysfs_delbr(struct net_device *dev);
 806
 807 #else
 808
 809 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 810 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 811 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 812 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 813 #endif /* CONFIG_SYSFS */
 814
 815 #endif