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 <net/ip6_fib.h>
  22 #include <linux/if_vlan.h>
  23 #include <linux/rhashtable.h>
  24
  25 #define BR_HASH_BITS 8
  26 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  27
  28 #define BR_HOLD_TIME (1*HZ)
  29
  30 #define BR_PORT_BITS    10
  31 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  32
  33 #define BR_VERSION      "2.3"
  34
  35 /* Control of forwarding link local multicast */
  36 #define BR_GROUPFWD_DEFAULT     0
  37 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
  38 #define BR_GROUPFWD_RESTRICTED  0x0007u
  39 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
  40 #define BR_GROUPFWD_8021AD      0xB801u
  41
  42 /* Path to usermode spanning tree program */
  43 #define BR_STP_PROG     "/sbin/bridge-stp"
  44
  45 typedef struct bridge_id bridge_id;
  46 typedef struct mac_addr mac_addr;
  47 typedef __u16 port_id;
  48
  49 struct bridge_id
  50 {
  51         unsigned char   prio[2];
  52         unsigned char   addr[ETH_ALEN];
  53 };
  54
  55 struct mac_addr
  56 {
  57         unsigned char   addr[ETH_ALEN];
  58 };
  59
  60 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  61 /* our own querier */
  62 struct bridge_mcast_own_query {
  63         struct timer_list       timer;
  64         u32                     startup_sent;
  65 };
  66
  67 /* other querier */
  68 struct bridge_mcast_other_query {
  69         struct timer_list               timer;
  70         unsigned long                   delay_time;
  71 };
  72
  73 /* selected querier */
  74 struct bridge_mcast_querier {
  75         struct br_ip addr;
  76         struct net_bridge_port __rcu    *port;
  77 };
  78 #endif
  79
  80 /**
  81  * struct net_bridge_vlan - per-vlan entry
  82  *
  83  * @vnode: rhashtable member
  84  * @vid: VLAN id
  85  * @flags: bridge vlan flags
  86  * @br: if MASTER flag set, this points to a bridge struct
  87  * @port: if MASTER flag unset, this points to a port struct
  88  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
  89  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
  90  *          for this VLAN entry
  91  * @vlist: sorted list of VLAN entries
  92  * @rcu: used for entry destruction
  93  *
  94  * This structure is shared between the global per-VLAN entries contained in
  95  * the bridge rhashtable and the local per-port per-VLAN entries contained in
  96  * the port's rhashtable. The union entries should be interpreted depending on
  97  * the entry flags that are set.
  98  */
  99 struct net_bridge_vlan {
 100         struct rhash_head               vnode;
 101         u16                             vid;
 102         u16                             flags;
 103         union {
 104                 struct net_bridge       *br;
 105                 struct net_bridge_port  *port;
 106         };
 107         union {
 108                 atomic_t                refcnt;
 109                 struct net_bridge_vlan  *brvlan;
 110         };
 111         struct list_head                vlist;
 112
 113         struct rcu_head                 rcu;
 114 };
 115
 116 /**
 117  * struct net_bridge_vlan_group
 118  *
 119  * @vlan_hash: VLAN entry rhashtable
 120  * @vlan_list: sorted VLAN entry list
 121  * @num_vlans: number of total VLAN entries
 122  * @pvid: PVID VLAN id
 123  *
 124  * IMPORTANT: Be careful when checking if there're VLAN entries using list
 125  *            primitives because the bridge can have entries in its list which
 126  *            are just for global context but not for filtering, i.e. they have
 127  *            the master flag set but not the brentry flag. If you have to check
 128  *            if there're "real" entries in the bridge please test @num_vlans
 129  */
 130 struct net_bridge_vlan_group {
 131         struct rhashtable               vlan_hash;
 132         struct list_head                vlan_list;
 133         u16                             num_vlans;
 134         u16                             pvid;
 135 };
 136
 137 struct net_bridge_fdb_entry
 138 {
 139         struct hlist_node               hlist;
 140         struct net_bridge_port          *dst;
 141
 142         unsigned long                   updated;
 143         unsigned long                   used;
 144         mac_addr                        addr;
 145         __u16                           vlan_id;
 146         unsigned char                   is_local:1,
 147                                         is_static:1,
 148                                         added_by_user:1,
 149                                         added_by_external_learn:1;
 150         struct rcu_head                 rcu;
 151 };
 152
 153 #define MDB_PG_FLAGS_PERMANENT  BIT(0)
 154 #define MDB_PG_FLAGS_OFFLOAD    BIT(1)
 155
 156 struct net_bridge_port_group {
 157         struct net_bridge_port          *port;
 158         struct net_bridge_port_group __rcu *next;
 159         struct hlist_node               mglist;
 160         struct rcu_head                 rcu;
 161         struct timer_list               timer;
 162         struct br_ip                    addr;
 163         unsigned char                   flags;
 164 };
 165
 166 struct net_bridge_mdb_entry
 167 {
 168         struct hlist_node               hlist[2];
 169         struct net_bridge               *br;
 170         struct net_bridge_port_group __rcu *ports;
 171         struct rcu_head                 rcu;
 172         struct timer_list               timer;
 173         struct br_ip                    addr;
 174         bool                            mglist;
 175 };
 176
 177 struct net_bridge_mdb_htable
 178 {
 179         struct hlist_head               *mhash;
 180         struct rcu_head                 rcu;
 181         struct net_bridge_mdb_htable    *old;
 182         u32                             size;
 183         u32                             max;
 184         u32                             secret;
 185         u32                             ver;
 186 };
 187
 188 struct net_bridge_port
 189 {
 190         struct net_bridge               *br;
 191         struct net_device               *dev;
 192         struct list_head                list;
 193
 194         /* STP */
 195         u8                              priority;
 196         u8                              state;
 197         u16                             port_no;
 198         unsigned char                   topology_change_ack;
 199         unsigned char                   config_pending;
 200         port_id                         port_id;
 201         port_id                         designated_port;
 202         bridge_id                       designated_root;
 203         bridge_id                       designated_bridge;
 204         u32                             path_cost;
 205         u32                             designated_cost;
 206         unsigned long                   designated_age;
 207
 208         struct timer_list               forward_delay_timer;
 209         struct timer_list               hold_timer;
 210         struct timer_list               message_age_timer;
 211         struct kobject                  kobj;
 212         struct rcu_head                 rcu;
 213
 214         unsigned long                   flags;
 215
 216 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 217         struct bridge_mcast_own_query   ip4_own_query;
 218 #if IS_ENABLED(CONFIG_IPV6)
 219         struct bridge_mcast_own_query   ip6_own_query;
 220 #endif /* IS_ENABLED(CONFIG_IPV6) */
 221         unsigned char                   multicast_router;
 222         struct timer_list               multicast_router_timer;
 223         struct hlist_head               mglist;
 224         struct hlist_node               rlist;
 225 #endif
 226
 227 #ifdef CONFIG_SYSFS
 228         char                            sysfs_name[IFNAMSIZ];
 229 #endif
 230
 231 #ifdef CONFIG_NET_POLL_CONTROLLER
 232         struct netpoll                  *np;
 233 #endif
 234 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 235         struct net_bridge_vlan_group    __rcu *vlgrp;
 236 #endif
 237 };
 238
 239 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 240 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 241
 242 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 243
 244 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 245 {
 246         return rcu_dereference(dev->rx_handler_data);
 247 }
 248
 249 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 250 {
 251         return br_port_exists(dev) ?
 252                 rtnl_dereference(dev->rx_handler_data) : NULL;
 253 }
 254
 255 struct net_bridge
 256 {
 257         spinlock_t                      lock;
 258         struct list_head                port_list;
 259         struct net_device               *dev;
 260
 261         struct pcpu_sw_netstats         __percpu *stats;
 262         spinlock_t                      hash_lock;
 263         struct hlist_head               hash[BR_HASH_SIZE];
 264 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 265         union {
 266                 struct rtable           fake_rtable;
 267                 struct rt6_info         fake_rt6_info;
 268         };
 269         bool                            nf_call_iptables;
 270         bool                            nf_call_ip6tables;
 271         bool                            nf_call_arptables;
 272 #endif
 273         u16                             group_fwd_mask;
 274         u16                             group_fwd_mask_required;
 275
 276         /* STP */
 277         bridge_id                       designated_root;
 278         bridge_id                       bridge_id;
 279         u32                             root_path_cost;
 280         unsigned long                   max_age;
 281         unsigned long                   hello_time;
 282         unsigned long                   forward_delay;
 283         unsigned long                   bridge_max_age;
 284         unsigned long                   ageing_time;
 285         unsigned long                   bridge_hello_time;
 286         unsigned long                   bridge_forward_delay;
 287
 288         u8                              group_addr[ETH_ALEN];
 289         bool                            group_addr_set;
 290         u16                             root_port;
 291
 292         enum {
 293                 BR_NO_STP,              /* no spanning tree */
 294                 BR_KERNEL_STP,          /* old STP in kernel */
 295                 BR_USER_STP,            /* new RSTP in userspace */
 296         } stp_enabled;
 297
 298         unsigned char                   topology_change;
 299         unsigned char                   topology_change_detected;
 300
 301 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 302         unsigned char                   multicast_router;
 303
 304         u8                              multicast_disabled:1;
 305         u8                              multicast_querier:1;
 306         u8                              multicast_query_use_ifaddr:1;
 307
 308         u32                             hash_elasticity;
 309         u32                             hash_max;
 310
 311         u32                             multicast_last_member_count;
 312         u32                             multicast_startup_query_count;
 313
 314         unsigned long                   multicast_last_member_interval;
 315         unsigned long                   multicast_membership_interval;
 316         unsigned long                   multicast_querier_interval;
 317         unsigned long                   multicast_query_interval;
 318         unsigned long                   multicast_query_response_interval;
 319         unsigned long                   multicast_startup_query_interval;
 320
 321         spinlock_t                      multicast_lock;
 322         struct net_bridge_mdb_htable __rcu *mdb;
 323         struct hlist_head               router_list;
 324
 325         struct timer_list               multicast_router_timer;
 326         struct bridge_mcast_other_query ip4_other_query;
 327         struct bridge_mcast_own_query   ip4_own_query;
 328         struct bridge_mcast_querier     ip4_querier;
 329 #if IS_ENABLED(CONFIG_IPV6)
 330         struct bridge_mcast_other_query ip6_other_query;
 331         struct bridge_mcast_own_query   ip6_own_query;
 332         struct bridge_mcast_querier     ip6_querier;
 333 #endif /* IS_ENABLED(CONFIG_IPV6) */
 334 #endif
 335
 336         struct timer_list               hello_timer;
 337         struct timer_list               tcn_timer;
 338         struct timer_list               topology_change_timer;
 339         struct timer_list               gc_timer;
 340         struct kobject                  *ifobj;
 341         u32                             auto_cnt;
 342 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 343         struct net_bridge_vlan_group    __rcu *vlgrp;
 344         u8                              vlan_enabled;
 345         __be16                          vlan_proto;
 346         u16                             default_pvid;
 347 #endif
 348 };
 349
 350 struct br_input_skb_cb {
 351         struct net_device *brdev;
 352
 353 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 354         int igmp;
 355         int mrouters_only;
 356 #endif
 357
 358         bool proxyarp_replied;
 359
 360 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 361         bool vlan_filtered;
 362 #endif
 363 };
 364
 365 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 366
 367 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 368 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 369 #else
 370 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 371 #endif
 372
 373 #define br_printk(level, br, format, args...)   \
 374         printk(level "%s: " format, (br)->dev->name, ##args)
 375
 376 #define br_err(__br, format, args...)                   \
 377         br_printk(KERN_ERR, __br, format, ##args)
 378 #define br_warn(__br, format, args...)                  \
 379         br_printk(KERN_WARNING, __br, format, ##args)
 380 #define br_notice(__br, format, args...)                \
 381         br_printk(KERN_NOTICE, __br, format, ##args)
 382 #define br_info(__br, format, args...)                  \
 383         br_printk(KERN_INFO, __br, format, ##args)
 384
 385 #define br_debug(br, format, args...)                   \
 386         pr_debug("%s: " format,  (br)->dev->name, ##args)
 387
 388 /* called under bridge lock */
 389 static inline int br_is_root_bridge(const struct net_bridge *br)
 390 {
 391         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 392 }
 393
 394 /* check if a VLAN entry is global */
 395 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 396 {
 397         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 398 }
 399
 400 /* check if a VLAN entry is used by the bridge */
 401 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 402 {
 403         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 404 }
 405
 406 /* check if we should use the vlan entry, returns false if it's only context */
 407 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 408 {
 409         if (br_vlan_is_master(v)) {
 410                 if (br_vlan_is_brentry(v))
 411                         return true;
 412                 else
 413                         return false;
 414         }
 415
 416         return true;
 417 }
 418
 419 /* br_device.c */
 420 void br_dev_setup(struct net_device *dev);
 421 void br_dev_delete(struct net_device *dev, struct list_head *list);
 422 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 423 #ifdef CONFIG_NET_POLL_CONTROLLER
 424 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 425                                        struct sk_buff *skb)
 426 {
 427         struct netpoll *np = p->np;
 428
 429         if (np)
 430                 netpoll_send_skb(np, skb);
 431 }
 432
 433 int br_netpoll_enable(struct net_bridge_port *p);
 434 void br_netpoll_disable(struct net_bridge_port *p);
 435 #else
 436 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 437                                        struct sk_buff *skb)
 438 {
 439 }
 440
 441 static inline int br_netpoll_enable(struct net_bridge_port *p)
 442 {
 443         return 0;
 444 }
 445
 446 static inline void br_netpoll_disable(struct net_bridge_port *p)
 447 {
 448 }
 449 #endif
 450
 451 /* br_fdb.c */
 452 int br_fdb_init(void);
 453 void br_fdb_fini(void);
 454 void br_fdb_flush(struct net_bridge *br);
 455 void br_fdb_find_delete_local(struct net_bridge *br,
 456                               const struct net_bridge_port *p,
 457                               const unsigned char *addr, u16 vid);
 458 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 459 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 460 void br_fdb_cleanup(unsigned long arg);
 461 void br_fdb_delete_by_port(struct net_bridge *br,
 462                            const struct net_bridge_port *p, u16 vid, int do_all);
 463 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 464                                           const unsigned char *addr, __u16 vid);
 465 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 466 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 467                    unsigned long off);
 468 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 469                   const unsigned char *addr, u16 vid);
 470 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 471                    const unsigned char *addr, u16 vid, bool added_by_user);
 472
 473 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 474                   struct net_device *dev, const unsigned char *addr, u16 vid);
 475 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 476                const unsigned char *addr, u16 vid, u16 nlh_flags);
 477 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 478                 struct net_device *dev, struct net_device *fdev, int idx);
 479 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 480 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 481 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 482                               const unsigned char *addr, u16 vid);
 483 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 484                               const unsigned char *addr, u16 vid);
 485
 486 /* br_forward.c */
 487 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 488 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 489 void br_forward(const struct net_bridge_port *to,
 490                 struct sk_buff *skb, struct sk_buff *skb0);
 491 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 492 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 493 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 494                       struct sk_buff *skb2, bool unicast);
 495
 496 /* br_if.c */
 497 void br_port_carrier_check(struct net_bridge_port *p);
 498 int br_add_bridge(struct net *net, const char *name);
 499 int br_del_bridge(struct net *net, const char *name);
 500 int br_add_if(struct net_bridge *br, struct net_device *dev);
 501 int br_del_if(struct net_bridge *br, struct net_device *dev);
 502 int br_min_mtu(const struct net_bridge *br);
 503 netdev_features_t br_features_recompute(struct net_bridge *br,
 504                                         netdev_features_t features);
 505 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 506 void br_manage_promisc(struct net_bridge *br);
 507
 508 /* br_input.c */
 509 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 510 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 511
 512 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 513 {
 514         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 515 }
 516
 517 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 518 {
 519         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 520 }
 521
 522 /* br_ioctl.c */
 523 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 524 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 525                              void __user *arg);
 526
 527 /* br_multicast.c */
 528 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 529 extern unsigned int br_mdb_rehash_seq;
 530 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 531                      struct sk_buff *skb, u16 vid);
 532 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 533                                         struct sk_buff *skb, u16 vid);
 534 void br_multicast_add_port(struct net_bridge_port *port);
 535 void br_multicast_del_port(struct net_bridge_port *port);
 536 void br_multicast_enable_port(struct net_bridge_port *port);
 537 void br_multicast_disable_port(struct net_bridge_port *port);
 538 void br_multicast_init(struct net_bridge *br);
 539 void br_multicast_open(struct net_bridge *br);
 540 void br_multicast_stop(struct net_bridge *br);
 541 void br_multicast_dev_del(struct net_bridge *br);
 542 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 543                           struct sk_buff *skb);
 544 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 545                           struct sk_buff *skb, struct sk_buff *skb2);
 546 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 547 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 548 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 549 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 550 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 551 struct net_bridge_mdb_entry *
 552 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 553 struct net_bridge_mdb_entry *
 554 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 555                        struct br_ip *group);
 556 void br_multicast_free_pg(struct rcu_head *head);
 557 struct net_bridge_port_group *
 558 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 559                             struct net_bridge_port_group __rcu *next,
 560                             unsigned char flags);
 561 void br_mdb_init(void);
 562 void br_mdb_uninit(void);
 563 void br_mdb_notify(struct net_device *dev, struct net_bridge_port_group *pg,
 564                    int type);
 565 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 566                    int type);
 567
 568 #define mlock_dereference(X, br) \
 569         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 570
 571 static inline bool br_multicast_is_router(struct net_bridge *br)
 572 {
 573         return br->multicast_router == 2 ||
 574                (br->multicast_router == 1 &&
 575                 timer_pending(&br->multicast_router_timer));
 576 }
 577
 578 static inline bool
 579 __br_multicast_querier_exists(struct net_bridge *br,
 580                               struct bridge_mcast_other_query *querier)
 581 {
 582         return time_is_before_jiffies(querier->delay_time) &&
 583                (br->multicast_querier || timer_pending(&querier->timer));
 584 }
 585
 586 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 587                                                struct ethhdr *eth)
 588 {
 589         switch (eth->h_proto) {
 590         case (htons(ETH_P_IP)):
 591                 return __br_multicast_querier_exists(br, &br->ip4_other_query);
 592 #if IS_ENABLED(CONFIG_IPV6)
 593         case (htons(ETH_P_IPV6)):
 594                 return __br_multicast_querier_exists(br, &br->ip6_other_query);
 595 #endif
 596         default:
 597                 return false;
 598         }
 599 }
 600 #else
 601 static inline int br_multicast_rcv(struct net_bridge *br,
 602                                    struct net_bridge_port *port,
 603                                    struct sk_buff *skb,
 604                                    u16 vid)
 605 {
 606         return 0;
 607 }
 608
 609 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 610                                                       struct sk_buff *skb, u16 vid)
 611 {
 612         return NULL;
 613 }
 614
 615 static inline void br_multicast_add_port(struct net_bridge_port *port)
 616 {
 617 }
 618
 619 static inline void br_multicast_del_port(struct net_bridge_port *port)
 620 {
 621 }
 622
 623 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 624 {
 625 }
 626
 627 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 628 {
 629 }
 630
 631 static inline void br_multicast_init(struct net_bridge *br)
 632 {
 633 }
 634
 635 static inline void br_multicast_open(struct net_bridge *br)
 636 {
 637 }
 638
 639 static inline void br_multicast_stop(struct net_bridge *br)
 640 {
 641 }
 642
 643 static inline void br_multicast_dev_del(struct net_bridge *br)
 644 {
 645 }
 646
 647 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 648                                         struct sk_buff *skb)
 649 {
 650 }
 651
 652 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 653                                         struct sk_buff *skb,
 654                                         struct sk_buff *skb2)
 655 {
 656 }
 657 static inline bool br_multicast_is_router(struct net_bridge *br)
 658 {
 659         return 0;
 660 }
 661 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 662                                                struct ethhdr *eth)
 663 {
 664         return false;
 665 }
 666 static inline void br_mdb_init(void)
 667 {
 668 }
 669 static inline void br_mdb_uninit(void)
 670 {
 671 }
 672 #endif
 673
 674 /* br_vlan.c */
 675 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 676 bool br_allowed_ingress(const struct net_bridge *br,
 677                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 678                         u16 *vid);
 679 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 680                        const struct sk_buff *skb);
 681 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 682 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 683                                struct net_bridge_vlan_group *vg,
 684                                struct sk_buff *skb);
 685 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 686 int br_vlan_delete(struct net_bridge *br, u16 vid);
 687 void br_vlan_flush(struct net_bridge *br);
 688 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 689 void br_recalculate_fwd_mask(struct net_bridge *br);
 690 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 691 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 692 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 693 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 694 int br_vlan_init(struct net_bridge *br);
 695 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 696 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
 697 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 698 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 699 void nbp_vlan_flush(struct net_bridge_port *port);
 700 int nbp_vlan_init(struct net_bridge_port *port);
 701 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 702
 703 static inline struct net_bridge_vlan_group *br_vlan_group(
 704                                         const struct net_bridge *br)
 705 {
 706         return rtnl_dereference(br->vlgrp);
 707 }
 708
 709 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 710                                         const struct net_bridge_port *p)
 711 {
 712         return rtnl_dereference(p->vlgrp);
 713 }
 714
 715 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 716                                         const struct net_bridge *br)
 717 {
 718         return rcu_dereference(br->vlgrp);
 719 }
 720
 721 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 722                                         const struct net_bridge_port *p)
 723 {
 724         return rcu_dereference(p->vlgrp);
 725 }
 726
 727 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 728  * skb, the vlan tag will always be present if the frame was tagged.
 729  */
 730 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 731 {
 732         int err = 0;
 733
 734         if (skb_vlan_tag_present(skb)) {
 735                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 736         } else {
 737                 *vid = 0;
 738                 err = -EINVAL;
 739         }
 740
 741         return err;
 742 }
 743
 744 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 745 {
 746         if (!vg)
 747                 return 0;
 748
 749         smp_rmb();
 750         return vg->pvid;
 751 }
 752
 753 static inline int br_vlan_enabled(struct net_bridge *br)
 754 {
 755         return br->vlan_enabled;
 756 }
 757 #else
 758 static inline bool br_allowed_ingress(const struct net_bridge *br,
 759                                       struct net_bridge_vlan_group *vg,
 760                                       struct sk_buff *skb,
 761                                       u16 *vid)
 762 {
 763         return true;
 764 }
 765
 766 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 767                                      const struct sk_buff *skb)
 768 {
 769         return true;
 770 }
 771
 772 static inline bool br_should_learn(struct net_bridge_port *p,
 773                                    struct sk_buff *skb, u16 *vid)
 774 {
 775         return true;
 776 }
 777
 778 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 779                                              struct net_bridge_vlan_group *vg,
 780                                              struct sk_buff *skb)
 781 {
 782         return skb;
 783 }
 784
 785 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 786 {
 787         return -EOPNOTSUPP;
 788 }
 789
 790 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 791 {
 792         return -EOPNOTSUPP;
 793 }
 794
 795 static inline void br_vlan_flush(struct net_bridge *br)
 796 {
 797 }
 798
 799 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 800 {
 801 }
 802
 803 static inline int br_vlan_init(struct net_bridge *br)
 804 {
 805         return 0;
 806 }
 807
 808 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 809 {
 810         return -EOPNOTSUPP;
 811 }
 812
 813 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 814 {
 815         return -EOPNOTSUPP;
 816 }
 817
 818 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 819 {
 820 }
 821
 822 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
 823                                                    u16 vid)
 824 {
 825         return NULL;
 826 }
 827
 828 static inline int nbp_vlan_init(struct net_bridge_port *port)
 829 {
 830         return 0;
 831 }
 832
 833 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 834 {
 835         return 0;
 836 }
 837
 838 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 839 {
 840         return 0;
 841 }
 842
 843 static inline int br_vlan_enabled(struct net_bridge *br)
 844 {
 845         return 0;
 846 }
 847
 848 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
 849                                           unsigned long val)
 850 {
 851         return -EOPNOTSUPP;
 852 }
 853
 854 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
 855                                          u32 filter_mask)
 856 {
 857         return 0;
 858 }
 859
 860 static inline struct net_bridge_vlan_group *br_vlan_group(
 861                                         const struct net_bridge *br)
 862 {
 863         return NULL;
 864 }
 865
 866 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 867                                         const struct net_bridge_port *p)
 868 {
 869         return NULL;
 870 }
 871
 872 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 873                                         const struct net_bridge *br)
 874 {
 875         return NULL;
 876 }
 877
 878 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 879                                         const struct net_bridge_port *p)
 880 {
 881         return NULL;
 882 }
 883
 884 #endif
 885
 886 struct nf_br_ops {
 887         int (*br_dev_xmit_hook)(struct sk_buff *skb);
 888 };
 889 extern const struct nf_br_ops __rcu *nf_br_ops;
 890
 891 /* br_netfilter.c */
 892 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 893 int br_nf_core_init(void);
 894 void br_nf_core_fini(void);
 895 void br_netfilter_rtable_init(struct net_bridge *);
 896 #else
 897 static inline int br_nf_core_init(void) { return 0; }
 898 static inline void br_nf_core_fini(void) {}
 899 #define br_netfilter_rtable_init(x)
 900 #endif
 901
 902 /* br_stp.c */
 903 void br_set_state(struct net_bridge_port *p, unsigned int state);
 904 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 905 void br_init_port(struct net_bridge_port *p);
 906 void br_become_designated_port(struct net_bridge_port *p);
 907
 908 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 909 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 910 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 911 int br_set_max_age(struct net_bridge *br, unsigned long x);
 912 int br_set_ageing_time(struct net_bridge *br, u32 ageing_time);
 913
 914
 915 /* br_stp_if.c */
 916 void br_stp_enable_bridge(struct net_bridge *br);
 917 void br_stp_disable_bridge(struct net_bridge *br);
 918 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 919 void br_stp_enable_port(struct net_bridge_port *p);
 920 void br_stp_disable_port(struct net_bridge_port *p);
 921 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 922 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 923 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 924 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 925 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 926 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 927
 928 /* br_stp_bpdu.c */
 929 struct stp_proto;
 930 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 931                 struct net_device *dev);
 932
 933 /* br_stp_timer.c */
 934 void br_stp_timer_init(struct net_bridge *br);
 935 void br_stp_port_timer_init(struct net_bridge_port *p);
 936 unsigned long br_timer_value(const struct timer_list *timer);
 937
 938 /* br.c */
 939 #if IS_ENABLED(CONFIG_ATM_LANE)
 940 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 941 #endif
 942
 943 /* br_netlink.c */
 944 extern struct rtnl_link_ops br_link_ops;
 945 int br_netlink_init(void);
 946 void br_netlink_fini(void);
 947 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 948 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 949 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 950 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 951                u32 filter_mask, int nlflags);
 952
 953 #ifdef CONFIG_SYSFS
 954 /* br_sysfs_if.c */
 955 extern const struct sysfs_ops brport_sysfs_ops;
 956 int br_sysfs_addif(struct net_bridge_port *p);
 957 int br_sysfs_renameif(struct net_bridge_port *p);
 958
 959 /* br_sysfs_br.c */
 960 int br_sysfs_addbr(struct net_device *dev);
 961 void br_sysfs_delbr(struct net_device *dev);
 962
 963 #else
 964
 965 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 966 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 967 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 968 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 969 #endif /* CONFIG_SYSFS */
 970
 971 #endif