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 struct br_vlan_stats {
  81         u64 rx_bytes;
  82         u64 rx_packets;
  83         u64 tx_bytes;
  84         u64 tx_packets;
  85         struct u64_stats_sync syncp;
  86 };
  87
  88 /**
  89  * struct net_bridge_vlan - per-vlan entry
  90  *
  91  * @vnode: rhashtable member
  92  * @vid: VLAN id
  93  * @flags: bridge vlan flags
  94  * @stats: per-cpu VLAN statistics
  95  * @br: if MASTER flag set, this points to a bridge struct
  96  * @port: if MASTER flag unset, this points to a port struct
  97  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
  98  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
  99  *          for this VLAN entry
 100  * @vlist: sorted list of VLAN entries
 101  * @rcu: used for entry destruction
 102  *
 103  * This structure is shared between the global per-VLAN entries contained in
 104  * the bridge rhashtable and the local per-port per-VLAN entries contained in
 105  * the port's rhashtable. The union entries should be interpreted depending on
 106  * the entry flags that are set.
 107  */
 108 struct net_bridge_vlan {
 109         struct rhash_head               vnode;
 110         u16                             vid;
 111         u16                             flags;
 112         struct br_vlan_stats __percpu   *stats;
 113         union {
 114                 struct net_bridge       *br;
 115                 struct net_bridge_port  *port;
 116         };
 117         union {
 118                 atomic_t                refcnt;
 119                 struct net_bridge_vlan  *brvlan;
 120         };
 121         struct list_head                vlist;
 122
 123         struct rcu_head                 rcu;
 124 };
 125
 126 /**
 127  * struct net_bridge_vlan_group
 128  *
 129  * @vlan_hash: VLAN entry rhashtable
 130  * @vlan_list: sorted VLAN entry list
 131  * @num_vlans: number of total VLAN entries
 132  * @pvid: PVID VLAN id
 133  *
 134  * IMPORTANT: Be careful when checking if there're VLAN entries using list
 135  *            primitives because the bridge can have entries in its list which
 136  *            are just for global context but not for filtering, i.e. they have
 137  *            the master flag set but not the brentry flag. If you have to check
 138  *            if there're "real" entries in the bridge please test @num_vlans
 139  */
 140 struct net_bridge_vlan_group {
 141         struct rhashtable               vlan_hash;
 142         struct list_head                vlan_list;
 143         u16                             num_vlans;
 144         u16                             pvid;
 145 };
 146
 147 struct net_bridge_fdb_entry
 148 {
 149         struct hlist_node               hlist;
 150         struct net_bridge_port          *dst;
 151
 152         unsigned long                   updated;
 153         unsigned long                   used;
 154         mac_addr                        addr;
 155         __u16                           vlan_id;
 156         unsigned char                   is_local:1,
 157                                         is_static:1,
 158                                         added_by_user:1,
 159                                         added_by_external_learn:1;
 160         struct rcu_head                 rcu;
 161 };
 162
 163 #define MDB_PG_FLAGS_PERMANENT  BIT(0)
 164 #define MDB_PG_FLAGS_OFFLOAD    BIT(1)
 165
 166 struct net_bridge_port_group {
 167         struct net_bridge_port          *port;
 168         struct net_bridge_port_group __rcu *next;
 169         struct hlist_node               mglist;
 170         struct rcu_head                 rcu;
 171         struct timer_list               timer;
 172         struct br_ip                    addr;
 173         unsigned char                   flags;
 174 };
 175
 176 struct net_bridge_mdb_entry
 177 {
 178         struct hlist_node               hlist[2];
 179         struct net_bridge               *br;
 180         struct net_bridge_port_group __rcu *ports;
 181         struct rcu_head                 rcu;
 182         struct timer_list               timer;
 183         struct br_ip                    addr;
 184         bool                            mglist;
 185 };
 186
 187 struct net_bridge_mdb_htable
 188 {
 189         struct hlist_head               *mhash;
 190         struct rcu_head                 rcu;
 191         struct net_bridge_mdb_htable    *old;
 192         u32                             size;
 193         u32                             max;
 194         u32                             secret;
 195         u32                             ver;
 196 };
 197
 198 struct net_bridge_port
 199 {
 200         struct net_bridge               *br;
 201         struct net_device               *dev;
 202         struct list_head                list;
 203
 204         /* STP */
 205         u8                              priority;
 206         u8                              state;
 207         u16                             port_no;
 208         unsigned char                   topology_change_ack;
 209         unsigned char                   config_pending;
 210         port_id                         port_id;
 211         port_id                         designated_port;
 212         bridge_id                       designated_root;
 213         bridge_id                       designated_bridge;
 214         u32                             path_cost;
 215         u32                             designated_cost;
 216         unsigned long                   designated_age;
 217
 218         struct timer_list               forward_delay_timer;
 219         struct timer_list               hold_timer;
 220         struct timer_list               message_age_timer;
 221         struct kobject                  kobj;
 222         struct rcu_head                 rcu;
 223
 224         unsigned long                   flags;
 225
 226 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 227         struct bridge_mcast_own_query   ip4_own_query;
 228 #if IS_ENABLED(CONFIG_IPV6)
 229         struct bridge_mcast_own_query   ip6_own_query;
 230 #endif /* IS_ENABLED(CONFIG_IPV6) */
 231         unsigned char                   multicast_router;
 232         struct timer_list               multicast_router_timer;
 233         struct hlist_head               mglist;
 234         struct hlist_node               rlist;
 235 #endif
 236
 237 #ifdef CONFIG_SYSFS
 238         char                            sysfs_name[IFNAMSIZ];
 239 #endif
 240
 241 #ifdef CONFIG_NET_POLL_CONTROLLER
 242         struct netpoll                  *np;
 243 #endif
 244 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 245         struct net_bridge_vlan_group    __rcu *vlgrp;
 246 #endif
 247 };
 248
 249 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 250 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 251
 252 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 253
 254 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 255 {
 256         return rcu_dereference(dev->rx_handler_data);
 257 }
 258
 259 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 260 {
 261         return br_port_exists(dev) ?
 262                 rtnl_dereference(dev->rx_handler_data) : NULL;
 263 }
 264
 265 struct net_bridge
 266 {
 267         spinlock_t                      lock;
 268         struct list_head                port_list;
 269         struct net_device               *dev;
 270
 271         struct pcpu_sw_netstats         __percpu *stats;
 272         spinlock_t                      hash_lock;
 273         struct hlist_head               hash[BR_HASH_SIZE];
 274 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 275         union {
 276                 struct rtable           fake_rtable;
 277                 struct rt6_info         fake_rt6_info;
 278         };
 279         bool                            nf_call_iptables;
 280         bool                            nf_call_ip6tables;
 281         bool                            nf_call_arptables;
 282 #endif
 283         u16                             group_fwd_mask;
 284         u16                             group_fwd_mask_required;
 285
 286         /* STP */
 287         bridge_id                       designated_root;
 288         bridge_id                       bridge_id;
 289         u32                             root_path_cost;
 290         unsigned long                   max_age;
 291         unsigned long                   hello_time;
 292         unsigned long                   forward_delay;
 293         unsigned long                   bridge_max_age;
 294         unsigned long                   ageing_time;
 295         unsigned long                   bridge_hello_time;
 296         unsigned long                   bridge_forward_delay;
 297
 298         u8                              group_addr[ETH_ALEN];
 299         bool                            group_addr_set;
 300         u16                             root_port;
 301
 302         enum {
 303                 BR_NO_STP,              /* no spanning tree */
 304                 BR_KERNEL_STP,          /* old STP in kernel */
 305                 BR_USER_STP,            /* new RSTP in userspace */
 306         } stp_enabled;
 307
 308         unsigned char                   topology_change;
 309         unsigned char                   topology_change_detected;
 310
 311 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 312         unsigned char                   multicast_router;
 313
 314         u8                              multicast_disabled:1;
 315         u8                              multicast_querier:1;
 316         u8                              multicast_query_use_ifaddr:1;
 317         u8                              has_ipv6_addr:1;
 318
 319         u32                             hash_elasticity;
 320         u32                             hash_max;
 321
 322         u32                             multicast_last_member_count;
 323         u32                             multicast_startup_query_count;
 324
 325         unsigned long                   multicast_last_member_interval;
 326         unsigned long                   multicast_membership_interval;
 327         unsigned long                   multicast_querier_interval;
 328         unsigned long                   multicast_query_interval;
 329         unsigned long                   multicast_query_response_interval;
 330         unsigned long                   multicast_startup_query_interval;
 331
 332         spinlock_t                      multicast_lock;
 333         struct net_bridge_mdb_htable __rcu *mdb;
 334         struct hlist_head               router_list;
 335
 336         struct timer_list               multicast_router_timer;
 337         struct bridge_mcast_other_query ip4_other_query;
 338         struct bridge_mcast_own_query   ip4_own_query;
 339         struct bridge_mcast_querier     ip4_querier;
 340 #if IS_ENABLED(CONFIG_IPV6)
 341         struct bridge_mcast_other_query ip6_other_query;
 342         struct bridge_mcast_own_query   ip6_own_query;
 343         struct bridge_mcast_querier     ip6_querier;
 344 #endif /* IS_ENABLED(CONFIG_IPV6) */
 345 #endif
 346
 347         struct timer_list               hello_timer;
 348         struct timer_list               tcn_timer;
 349         struct timer_list               topology_change_timer;
 350         struct timer_list               gc_timer;
 351         struct kobject                  *ifobj;
 352         u32                             auto_cnt;
 353 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 354         struct net_bridge_vlan_group    __rcu *vlgrp;
 355         u8                              vlan_enabled;
 356         u8                              vlan_stats_enabled;
 357         __be16                          vlan_proto;
 358         u16                             default_pvid;
 359 #endif
 360 };
 361
 362 struct br_input_skb_cb {
 363         struct net_device *brdev;
 364
 365 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 366         int igmp;
 367         int mrouters_only;
 368 #endif
 369
 370         bool proxyarp_replied;
 371
 372 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 373         bool vlan_filtered;
 374 #endif
 375 };
 376
 377 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 378
 379 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 380 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 381 #else
 382 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 383 #endif
 384
 385 #define br_printk(level, br, format, args...)   \
 386         printk(level "%s: " format, (br)->dev->name, ##args)
 387
 388 #define br_err(__br, format, args...)                   \
 389         br_printk(KERN_ERR, __br, format, ##args)
 390 #define br_warn(__br, format, args...)                  \
 391         br_printk(KERN_WARNING, __br, format, ##args)
 392 #define br_notice(__br, format, args...)                \
 393         br_printk(KERN_NOTICE, __br, format, ##args)
 394 #define br_info(__br, format, args...)                  \
 395         br_printk(KERN_INFO, __br, format, ##args)
 396
 397 #define br_debug(br, format, args...)                   \
 398         pr_debug("%s: " format,  (br)->dev->name, ##args)
 399
 400 /* called under bridge lock */
 401 static inline int br_is_root_bridge(const struct net_bridge *br)
 402 {
 403         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 404 }
 405
 406 /* check if a VLAN entry is global */
 407 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 408 {
 409         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 410 }
 411
 412 /* check if a VLAN entry is used by the bridge */
 413 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 414 {
 415         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 416 }
 417
 418 /* check if we should use the vlan entry, returns false if it's only context */
 419 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 420 {
 421         if (br_vlan_is_master(v)) {
 422                 if (br_vlan_is_brentry(v))
 423                         return true;
 424                 else
 425                         return false;
 426         }
 427
 428         return true;
 429 }
 430
 431 /* br_device.c */
 432 void br_dev_setup(struct net_device *dev);
 433 void br_dev_delete(struct net_device *dev, struct list_head *list);
 434 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 435 #ifdef CONFIG_NET_POLL_CONTROLLER
 436 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 437                                        struct sk_buff *skb)
 438 {
 439         struct netpoll *np = p->np;
 440
 441         if (np)
 442                 netpoll_send_skb(np, skb);
 443 }
 444
 445 int br_netpoll_enable(struct net_bridge_port *p);
 446 void br_netpoll_disable(struct net_bridge_port *p);
 447 #else
 448 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 449                                        struct sk_buff *skb)
 450 {
 451 }
 452
 453 static inline int br_netpoll_enable(struct net_bridge_port *p)
 454 {
 455         return 0;
 456 }
 457
 458 static inline void br_netpoll_disable(struct net_bridge_port *p)
 459 {
 460 }
 461 #endif
 462
 463 /* br_fdb.c */
 464 int br_fdb_init(void);
 465 void br_fdb_fini(void);
 466 void br_fdb_flush(struct net_bridge *br);
 467 void br_fdb_find_delete_local(struct net_bridge *br,
 468                               const struct net_bridge_port *p,
 469                               const unsigned char *addr, u16 vid);
 470 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 471 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 472 void br_fdb_cleanup(unsigned long arg);
 473 void br_fdb_delete_by_port(struct net_bridge *br,
 474                            const struct net_bridge_port *p, u16 vid, int do_all);
 475 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 476                                           const unsigned char *addr, __u16 vid);
 477 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 478 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 479                    unsigned long off);
 480 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 481                   const unsigned char *addr, u16 vid);
 482 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 483                    const unsigned char *addr, u16 vid, bool added_by_user);
 484
 485 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 486                   struct net_device *dev, const unsigned char *addr, u16 vid);
 487 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 488                const unsigned char *addr, u16 vid, u16 nlh_flags);
 489 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 490                 struct net_device *dev, struct net_device *fdev, int idx);
 491 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 492 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 493 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 494                               const unsigned char *addr, u16 vid);
 495 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 496                               const unsigned char *addr, u16 vid);
 497
 498 /* br_forward.c */
 499 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 500 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 501 void br_forward(const struct net_bridge_port *to,
 502                 struct sk_buff *skb, struct sk_buff *skb0);
 503 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 504 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 505 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 506                       struct sk_buff *skb2, bool unicast);
 507
 508 /* br_if.c */
 509 void br_port_carrier_check(struct net_bridge_port *p);
 510 int br_add_bridge(struct net *net, const char *name);
 511 int br_del_bridge(struct net *net, const char *name);
 512 int br_add_if(struct net_bridge *br, struct net_device *dev);
 513 int br_del_if(struct net_bridge *br, struct net_device *dev);
 514 int br_min_mtu(const struct net_bridge *br);
 515 netdev_features_t br_features_recompute(struct net_bridge *br,
 516                                         netdev_features_t features);
 517 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 518 void br_manage_promisc(struct net_bridge *br);
 519
 520 /* br_input.c */
 521 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 522 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 523
 524 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 525 {
 526         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 527 }
 528
 529 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 530 {
 531         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 532 }
 533
 534 /* br_ioctl.c */
 535 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 536 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 537                              void __user *arg);
 538
 539 /* br_multicast.c */
 540 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 541 extern unsigned int br_mdb_rehash_seq;
 542 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 543                      struct sk_buff *skb, u16 vid);
 544 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 545                                         struct sk_buff *skb, u16 vid);
 546 void br_multicast_add_port(struct net_bridge_port *port);
 547 void br_multicast_del_port(struct net_bridge_port *port);
 548 void br_multicast_enable_port(struct net_bridge_port *port);
 549 void br_multicast_disable_port(struct net_bridge_port *port);
 550 void br_multicast_init(struct net_bridge *br);
 551 void br_multicast_open(struct net_bridge *br);
 552 void br_multicast_stop(struct net_bridge *br);
 553 void br_multicast_dev_del(struct net_bridge *br);
 554 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 555                           struct sk_buff *skb);
 556 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 557                           struct sk_buff *skb, struct sk_buff *skb2);
 558 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 559 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 560 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 561 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 562 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 563 struct net_bridge_mdb_entry *
 564 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 565 struct net_bridge_mdb_entry *
 566 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 567                        struct br_ip *group);
 568 void br_multicast_free_pg(struct rcu_head *head);
 569 struct net_bridge_port_group *
 570 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 571                             struct net_bridge_port_group __rcu *next,
 572                             unsigned char flags);
 573 void br_mdb_init(void);
 574 void br_mdb_uninit(void);
 575 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 576                    struct br_ip *group, int type, u8 flags);
 577 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 578                    int type);
 579
 580 #define mlock_dereference(X, br) \
 581         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 582
 583 static inline bool br_multicast_is_router(struct net_bridge *br)
 584 {
 585         return br->multicast_router == 2 ||
 586                (br->multicast_router == 1 &&
 587                 timer_pending(&br->multicast_router_timer));
 588 }
 589
 590 static inline bool
 591 __br_multicast_querier_exists(struct net_bridge *br,
 592                                 struct bridge_mcast_other_query *querier,
 593                                 const bool is_ipv6)
 594 {
 595         bool own_querier_enabled;
 596
 597         if (br->multicast_querier) {
 598                 if (is_ipv6 && !br->has_ipv6_addr)
 599                         own_querier_enabled = false;
 600                 else
 601                         own_querier_enabled = true;
 602         } else {
 603                 own_querier_enabled = false;
 604         }
 605
 606         return time_is_before_jiffies(querier->delay_time) &&
 607                (own_querier_enabled || timer_pending(&querier->timer));
 608 }
 609
 610 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 611                                                struct ethhdr *eth)
 612 {
 613         switch (eth->h_proto) {
 614         case (htons(ETH_P_IP)):
 615                 return __br_multicast_querier_exists(br,
 616                         &br->ip4_other_query, false);
 617 #if IS_ENABLED(CONFIG_IPV6)
 618         case (htons(ETH_P_IPV6)):
 619                 return __br_multicast_querier_exists(br,
 620                         &br->ip6_other_query, true);
 621 #endif
 622         default:
 623                 return false;
 624         }
 625 }
 626 #else
 627 static inline int br_multicast_rcv(struct net_bridge *br,
 628                                    struct net_bridge_port *port,
 629                                    struct sk_buff *skb,
 630                                    u16 vid)
 631 {
 632         return 0;
 633 }
 634
 635 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 636                                                       struct sk_buff *skb, u16 vid)
 637 {
 638         return NULL;
 639 }
 640
 641 static inline void br_multicast_add_port(struct net_bridge_port *port)
 642 {
 643 }
 644
 645 static inline void br_multicast_del_port(struct net_bridge_port *port)
 646 {
 647 }
 648
 649 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 650 {
 651 }
 652
 653 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 654 {
 655 }
 656
 657 static inline void br_multicast_init(struct net_bridge *br)
 658 {
 659 }
 660
 661 static inline void br_multicast_open(struct net_bridge *br)
 662 {
 663 }
 664
 665 static inline void br_multicast_stop(struct net_bridge *br)
 666 {
 667 }
 668
 669 static inline void br_multicast_dev_del(struct net_bridge *br)
 670 {
 671 }
 672
 673 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 674                                         struct sk_buff *skb)
 675 {
 676 }
 677
 678 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 679                                         struct sk_buff *skb,
 680                                         struct sk_buff *skb2)
 681 {
 682 }
 683 static inline bool br_multicast_is_router(struct net_bridge *br)
 684 {
 685         return 0;
 686 }
 687 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 688                                                struct ethhdr *eth)
 689 {
 690         return false;
 691 }
 692 static inline void br_mdb_init(void)
 693 {
 694 }
 695 static inline void br_mdb_uninit(void)
 696 {
 697 }
 698 #endif
 699
 700 /* br_vlan.c */
 701 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 702 bool br_allowed_ingress(const struct net_bridge *br,
 703                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 704                         u16 *vid);
 705 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 706                        const struct sk_buff *skb);
 707 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 708 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 709                                struct net_bridge_vlan_group *vg,
 710                                struct sk_buff *skb);
 711 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 712 int br_vlan_delete(struct net_bridge *br, u16 vid);
 713 void br_vlan_flush(struct net_bridge *br);
 714 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 715 void br_recalculate_fwd_mask(struct net_bridge *br);
 716 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 717 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 718 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 719 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 720 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
 721 int br_vlan_init(struct net_bridge *br);
 722 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 723 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
 724 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 725 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 726 void nbp_vlan_flush(struct net_bridge_port *port);
 727 int nbp_vlan_init(struct net_bridge_port *port);
 728 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 729 void br_vlan_get_stats(const struct net_bridge_vlan *v,
 730                        struct br_vlan_stats *stats);
 731
 732 static inline struct net_bridge_vlan_group *br_vlan_group(
 733                                         const struct net_bridge *br)
 734 {
 735         return rtnl_dereference(br->vlgrp);
 736 }
 737
 738 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 739                                         const struct net_bridge_port *p)
 740 {
 741         return rtnl_dereference(p->vlgrp);
 742 }
 743
 744 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 745                                         const struct net_bridge *br)
 746 {
 747         return rcu_dereference(br->vlgrp);
 748 }
 749
 750 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 751                                         const struct net_bridge_port *p)
 752 {
 753         return rcu_dereference(p->vlgrp);
 754 }
 755
 756 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 757  * skb, the vlan tag will always be present if the frame was tagged.
 758  */
 759 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 760 {
 761         int err = 0;
 762
 763         if (skb_vlan_tag_present(skb)) {
 764                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 765         } else {
 766                 *vid = 0;
 767                 err = -EINVAL;
 768         }
 769
 770         return err;
 771 }
 772
 773 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 774 {
 775         if (!vg)
 776                 return 0;
 777
 778         smp_rmb();
 779         return vg->pvid;
 780 }
 781
 782 static inline int br_vlan_enabled(struct net_bridge *br)
 783 {
 784         return br->vlan_enabled;
 785 }
 786 #else
 787 static inline bool br_allowed_ingress(const struct net_bridge *br,
 788                                       struct net_bridge_vlan_group *vg,
 789                                       struct sk_buff *skb,
 790                                       u16 *vid)
 791 {
 792         return true;
 793 }
 794
 795 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 796                                      const struct sk_buff *skb)
 797 {
 798         return true;
 799 }
 800
 801 static inline bool br_should_learn(struct net_bridge_port *p,
 802                                    struct sk_buff *skb, u16 *vid)
 803 {
 804         return true;
 805 }
 806
 807 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 808                                              struct net_bridge_vlan_group *vg,
 809                                              struct sk_buff *skb)
 810 {
 811         return skb;
 812 }
 813
 814 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 815 {
 816         return -EOPNOTSUPP;
 817 }
 818
 819 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 820 {
 821         return -EOPNOTSUPP;
 822 }
 823
 824 static inline void br_vlan_flush(struct net_bridge *br)
 825 {
 826 }
 827
 828 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 829 {
 830 }
 831
 832 static inline int br_vlan_init(struct net_bridge *br)
 833 {
 834         return 0;
 835 }
 836
 837 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 838 {
 839         return -EOPNOTSUPP;
 840 }
 841
 842 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 843 {
 844         return -EOPNOTSUPP;
 845 }
 846
 847 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 848 {
 849 }
 850
 851 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
 852                                                    u16 vid)
 853 {
 854         return NULL;
 855 }
 856
 857 static inline int nbp_vlan_init(struct net_bridge_port *port)
 858 {
 859         return 0;
 860 }
 861
 862 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 863 {
 864         return 0;
 865 }
 866
 867 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 868 {
 869         return 0;
 870 }
 871
 872 static inline int br_vlan_enabled(struct net_bridge *br)
 873 {
 874         return 0;
 875 }
 876
 877 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
 878                                           unsigned long val)
 879 {
 880         return -EOPNOTSUPP;
 881 }
 882
 883 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
 884                                          u32 filter_mask)
 885 {
 886         return 0;
 887 }
 888
 889 static inline struct net_bridge_vlan_group *br_vlan_group(
 890                                         const struct net_bridge *br)
 891 {
 892         return NULL;
 893 }
 894
 895 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 896                                         const struct net_bridge_port *p)
 897 {
 898         return NULL;
 899 }
 900
 901 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 902                                         const struct net_bridge *br)
 903 {
 904         return NULL;
 905 }
 906
 907 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 908                                         const struct net_bridge_port *p)
 909 {
 910         return NULL;
 911 }
 912
 913 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
 914                                      struct br_vlan_stats *stats)
 915 {
 916 }
 917 #endif
 918
 919 struct nf_br_ops {
 920         int (*br_dev_xmit_hook)(struct sk_buff *skb);
 921 };
 922 extern const struct nf_br_ops __rcu *nf_br_ops;
 923
 924 /* br_netfilter.c */
 925 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 926 int br_nf_core_init(void);
 927 void br_nf_core_fini(void);
 928 void br_netfilter_rtable_init(struct net_bridge *);
 929 #else
 930 static inline int br_nf_core_init(void) { return 0; }
 931 static inline void br_nf_core_fini(void) {}
 932 #define br_netfilter_rtable_init(x)
 933 #endif
 934
 935 /* br_stp.c */
 936 void br_set_state(struct net_bridge_port *p, unsigned int state);
 937 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 938 void br_init_port(struct net_bridge_port *p);
 939 void br_become_designated_port(struct net_bridge_port *p);
 940
 941 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 942 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 943 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 944 int br_set_max_age(struct net_bridge *br, unsigned long x);
 945 int br_set_ageing_time(struct net_bridge *br, u32 ageing_time);
 946
 947
 948 /* br_stp_if.c */
 949 void br_stp_enable_bridge(struct net_bridge *br);
 950 void br_stp_disable_bridge(struct net_bridge *br);
 951 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 952 void br_stp_enable_port(struct net_bridge_port *p);
 953 void br_stp_disable_port(struct net_bridge_port *p);
 954 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 955 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 956 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 957 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 958 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 959 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 960
 961 /* br_stp_bpdu.c */
 962 struct stp_proto;
 963 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 964                 struct net_device *dev);
 965
 966 /* br_stp_timer.c */
 967 void br_stp_timer_init(struct net_bridge *br);
 968 void br_stp_port_timer_init(struct net_bridge_port *p);
 969 unsigned long br_timer_value(const struct timer_list *timer);
 970
 971 /* br.c */
 972 #if IS_ENABLED(CONFIG_ATM_LANE)
 973 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 974 #endif
 975
 976 /* br_netlink.c */
 977 extern struct rtnl_link_ops br_link_ops;
 978 int br_netlink_init(void);
 979 void br_netlink_fini(void);
 980 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 981 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 982 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 983 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 984                u32 filter_mask, int nlflags);
 985
 986 #ifdef CONFIG_SYSFS
 987 /* br_sysfs_if.c */
 988 extern const struct sysfs_ops brport_sysfs_ops;
 989 int br_sysfs_addif(struct net_bridge_port *p);
 990 int br_sysfs_renameif(struct net_bridge_port *p);
 991
 992 /* br_sysfs_br.c */
 993 int br_sysfs_addbr(struct net_device *dev);
 994 void br_sysfs_delbr(struct net_device *dev);
 995
 996 #else
 997
 998 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 999 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1000 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1001 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1002 #endif /* CONFIG_SYSFS */
1003
1004 #endif