net/bridge/br_private.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  *      Linux ethernet bridge
   4  *
   5  *      Authors:
   6  *      Lennert Buytenhek               <buytenh@gnu.org>
   7  */
   8
   9 #ifndef _BR_PRIVATE_H
  10 #define _BR_PRIVATE_H
  11
  12 #include <linux/netdevice.h>
  13 #include <linux/if_bridge.h>
  14 #include <linux/netpoll.h>
  15 #include <linux/u64_stats_sync.h>
  16 #include <net/route.h>
  17 #include <net/ip6_fib.h>
  18 #include <linux/if_vlan.h>
  19 #include <linux/rhashtable.h>
  20 #include <linux/refcount.h>
  21
  22 #define BR_HASH_BITS 8
  23 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  24
  25 #define BR_HOLD_TIME (1*HZ)
  26
  27 #define BR_PORT_BITS    10
  28 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  29
  30 #define BR_MULTICAST_DEFAULT_HASH_MAX 4096
  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 of control protocols like STP, MAC PAUSE and LACP */
  37 enum {
  38         BR_GROUPFWD_STP         = BIT(0),
  39         BR_GROUPFWD_MACPAUSE    = BIT(1),
  40         BR_GROUPFWD_LACP        = BIT(2),
  41 };
  42
  43 #define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \
  44                                 BR_GROUPFWD_LACP)
  45 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
  46 #define BR_GROUPFWD_8021AD      0xB801u
  47
  48 /* Path to usermode spanning tree program */
  49 #define BR_STP_PROG     "/sbin/bridge-stp"
  50
  51 #define BR_FDB_NOTIFY_SETTABLE_BITS (FDB_NOTIFY_BIT | FDB_NOTIFY_INACTIVE_BIT)
  52
  53 typedef struct bridge_id bridge_id;
  54 typedef struct mac_addr mac_addr;
  55 typedef __u16 port_id;
  56
  57 struct bridge_id {
  58         unsigned char   prio[2];
  59         unsigned char   addr[ETH_ALEN];
  60 };
  61
  62 struct mac_addr {
  63         unsigned char   addr[ETH_ALEN];
  64 };
  65
  66 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  67 /* our own querier */
  68 struct bridge_mcast_own_query {
  69         struct timer_list       timer;
  70         u32                     startup_sent;
  71 };
  72
  73 /* other querier */
  74 struct bridge_mcast_other_query {
  75         struct timer_list               timer;
  76         unsigned long                   delay_time;
  77 };
  78
  79 /* selected querier */
  80 struct bridge_mcast_querier {
  81         struct br_ip addr;
  82         struct net_bridge_port __rcu    *port;
  83 };
  84
  85 /* IGMP/MLD statistics */
  86 struct bridge_mcast_stats {
  87         struct br_mcast_stats mstats;
  88         struct u64_stats_sync syncp;
  89 };
  90 #endif
  91
  92 struct br_tunnel_info {
  93         __be64                  tunnel_id;
  94         struct metadata_dst     *tunnel_dst;
  95 };
  96
  97 /* private vlan flags */
  98 enum {
  99         BR_VLFLAG_PER_PORT_STATS = BIT(0),
 100         BR_VLFLAG_ADDED_BY_SWITCHDEV = BIT(1),
 101 };
 102
 103 /**
 104  * struct net_bridge_vlan - per-vlan entry
 105  *
 106  * @vnode: rhashtable member
 107  * @vid: VLAN id
 108  * @flags: bridge vlan flags
 109  * @priv_flags: private (in-kernel) bridge vlan flags
 110  * @state: STP state (e.g. blocking, learning, forwarding)
 111  * @stats: per-cpu VLAN statistics
 112  * @br: if MASTER flag set, this points to a bridge struct
 113  * @port: if MASTER flag unset, this points to a port struct
 114  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
 115  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
 116  *          for this VLAN entry
 117  * @vlist: sorted list of VLAN entries
 118  * @rcu: used for entry destruction
 119  *
 120  * This structure is shared between the global per-VLAN entries contained in
 121  * the bridge rhashtable and the local per-port per-VLAN entries contained in
 122  * the port's rhashtable. The union entries should be interpreted depending on
 123  * the entry flags that are set.
 124  */
 125 struct net_bridge_vlan {
 126         struct rhash_head               vnode;
 127         struct rhash_head               tnode;
 128         u16                             vid;
 129         u16                             flags;
 130         u16                             priv_flags;
 131         u8                              state;
 132         struct pcpu_sw_netstats __percpu *stats;
 133         union {
 134                 struct net_bridge       *br;
 135                 struct net_bridge_port  *port;
 136         };
 137         union {
 138                 refcount_t              refcnt;
 139                 struct net_bridge_vlan  *brvlan;
 140         };
 141
 142         struct br_tunnel_info           tinfo;
 143
 144         struct list_head                vlist;
 145
 146         struct rcu_head                 rcu;
 147 };
 148
 149 /**
 150  * struct net_bridge_vlan_group
 151  *
 152  * @vlan_hash: VLAN entry rhashtable
 153  * @vlan_list: sorted VLAN entry list
 154  * @num_vlans: number of total VLAN entries
 155  * @pvid: PVID VLAN id
 156  * @pvid_state: PVID's STP state (e.g. forwarding, learning, blocking)
 157  *
 158  * IMPORTANT: Be careful when checking if there're VLAN entries using list
 159  *            primitives because the bridge can have entries in its list which
 160  *            are just for global context but not for filtering, i.e. they have
 161  *            the master flag set but not the brentry flag. If you have to check
 162  *            if there're "real" entries in the bridge please test @num_vlans
 163  */
 164 struct net_bridge_vlan_group {
 165         struct rhashtable               vlan_hash;
 166         struct rhashtable               tunnel_hash;
 167         struct list_head                vlan_list;
 168         u16                             num_vlans;
 169         u16                             pvid;
 170         u8                              pvid_state;
 171 };
 172
 173 /* bridge fdb flags */
 174 enum {
 175         BR_FDB_LOCAL,
 176         BR_FDB_STATIC,
 177         BR_FDB_STICKY,
 178         BR_FDB_ADDED_BY_USER,
 179         BR_FDB_ADDED_BY_EXT_LEARN,
 180         BR_FDB_OFFLOADED,
 181         BR_FDB_NOTIFY,
 182         BR_FDB_NOTIFY_INACTIVE
 183 };
 184
 185 struct net_bridge_fdb_key {
 186         mac_addr addr;
 187         u16 vlan_id;
 188 };
 189
 190 struct net_bridge_fdb_entry {
 191         struct rhash_head               rhnode;
 192         struct net_bridge_port          *dst;
 193
 194         struct net_bridge_fdb_key       key;
 195         struct hlist_node               fdb_node;
 196         unsigned long                   flags;
 197
 198         /* write-heavy members should not affect lookups */
 199         unsigned long                   updated ____cacheline_aligned_in_smp;
 200         unsigned long                   used;
 201
 202         struct rcu_head                 rcu;
 203 };
 204
 205 #define MDB_PG_FLAGS_PERMANENT  BIT(0)
 206 #define MDB_PG_FLAGS_OFFLOAD    BIT(1)
 207 #define MDB_PG_FLAGS_FAST_LEAVE BIT(2)
 208 #define MDB_PG_FLAGS_STAR_EXCL  BIT(3)
 209 #define MDB_PG_FLAGS_BLOCKED    BIT(4)
 210
 211 #define PG_SRC_ENT_LIMIT        32
 212
 213 #define BR_SGRP_F_DELETE        BIT(0)
 214 #define BR_SGRP_F_SEND          BIT(1)
 215 #define BR_SGRP_F_INSTALLED     BIT(2)
 216
 217 struct net_bridge_mcast_gc {
 218         struct hlist_node               gc_node;
 219         void                            (*destroy)(struct net_bridge_mcast_gc *gc);
 220 };
 221
 222 struct net_bridge_group_src {
 223         struct hlist_node               node;
 224
 225         struct br_ip                    addr;
 226         struct net_bridge_port_group    *pg;
 227         u8                              flags;
 228         u8                              src_query_rexmit_cnt;
 229         struct timer_list               timer;
 230
 231         struct net_bridge               *br;
 232         struct net_bridge_mcast_gc      mcast_gc;
 233         struct rcu_head                 rcu;
 234 };
 235
 236 struct net_bridge_port_group_sg_key {
 237         struct net_bridge_port          *port;
 238         struct br_ip                    addr;
 239 };
 240
 241 struct net_bridge_port_group {
 242         struct net_bridge_port_group __rcu *next;
 243         struct net_bridge_port_group_sg_key key;
 244         unsigned char                   eth_addr[ETH_ALEN] __aligned(2);
 245         unsigned char                   flags;
 246         unsigned char                   filter_mode;
 247         unsigned char                   grp_query_rexmit_cnt;
 248         unsigned char                   rt_protocol;
 249
 250         struct hlist_head               src_list;
 251         unsigned int                    src_ents;
 252         struct timer_list               timer;
 253         struct timer_list               rexmit_timer;
 254         struct hlist_node               mglist;
 255         struct rb_root                  eht_set_tree;
 256         struct rb_root                  eht_host_tree;
 257
 258         struct rhash_head               rhnode;
 259         struct net_bridge_mcast_gc      mcast_gc;
 260         struct rcu_head                 rcu;
 261 };
 262
 263 struct net_bridge_mdb_entry {
 264         struct rhash_head               rhnode;
 265         struct net_bridge               *br;
 266         struct net_bridge_port_group __rcu *ports;
 267         struct br_ip                    addr;
 268         bool                            host_joined;
 269
 270         struct timer_list               timer;
 271         struct hlist_node               mdb_node;
 272
 273         struct net_bridge_mcast_gc      mcast_gc;
 274         struct rcu_head                 rcu;
 275 };
 276
 277 struct net_bridge_port {
 278         struct net_bridge               *br;
 279         struct net_device               *dev;
 280         struct list_head                list;
 281
 282         unsigned long                   flags;
 283 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 284         struct net_bridge_vlan_group    __rcu *vlgrp;
 285 #endif
 286         struct net_bridge_port          __rcu *backup_port;
 287
 288         /* STP */
 289         u8                              priority;
 290         u8                              state;
 291         u16                             port_no;
 292         unsigned char                   topology_change_ack;
 293         unsigned char                   config_pending;
 294         port_id                         port_id;
 295         port_id                         designated_port;
 296         bridge_id                       designated_root;
 297         bridge_id                       designated_bridge;
 298         u32                             path_cost;
 299         u32                             designated_cost;
 300         unsigned long                   designated_age;
 301
 302         struct timer_list               forward_delay_timer;
 303         struct timer_list               hold_timer;
 304         struct timer_list               message_age_timer;
 305         struct kobject                  kobj;
 306         struct rcu_head                 rcu;
 307
 308 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 309         struct bridge_mcast_own_query   ip4_own_query;
 310 #if IS_ENABLED(CONFIG_IPV6)
 311         struct bridge_mcast_own_query   ip6_own_query;
 312 #endif /* IS_ENABLED(CONFIG_IPV6) */
 313         u32                             multicast_eht_hosts_limit;
 314         u32                             multicast_eht_hosts_cnt;
 315         unsigned char                   multicast_router;
 316         struct bridge_mcast_stats       __percpu *mcast_stats;
 317         struct timer_list               multicast_router_timer;
 318         struct hlist_head               mglist;
 319         struct hlist_node               rlist;
 320 #endif
 321
 322 #ifdef CONFIG_SYSFS
 323         char                            sysfs_name[IFNAMSIZ];
 324 #endif
 325
 326 #ifdef CONFIG_NET_POLL_CONTROLLER
 327         struct netpoll                  *np;
 328 #endif
 329 #ifdef CONFIG_NET_SWITCHDEV
 330         int                             offload_fwd_mark;
 331 #endif
 332         u16                             group_fwd_mask;
 333         u16                             backup_redirected_cnt;
 334
 335         struct bridge_stp_xstats        stp_xstats;
 336 };
 337
 338 #define kobj_to_brport(obj)     container_of(obj, struct net_bridge_port, kobj)
 339
 340 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 341 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 342
 343 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 344 {
 345         return rcu_dereference(dev->rx_handler_data);
 346 }
 347
 348 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 349 {
 350         return netif_is_bridge_port(dev) ?
 351                 rtnl_dereference(dev->rx_handler_data) : NULL;
 352 }
 353
 354 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev)
 355 {
 356         return netif_is_bridge_port(dev) ?
 357                 rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
 358 }
 359
 360 enum net_bridge_opts {
 361         BROPT_VLAN_ENABLED,
 362         BROPT_VLAN_STATS_ENABLED,
 363         BROPT_NF_CALL_IPTABLES,
 364         BROPT_NF_CALL_IP6TABLES,
 365         BROPT_NF_CALL_ARPTABLES,
 366         BROPT_GROUP_ADDR_SET,
 367         BROPT_MULTICAST_ENABLED,
 368         BROPT_MULTICAST_QUERIER,
 369         BROPT_MULTICAST_QUERY_USE_IFADDR,
 370         BROPT_MULTICAST_STATS_ENABLED,
 371         BROPT_HAS_IPV6_ADDR,
 372         BROPT_NEIGH_SUPPRESS_ENABLED,
 373         BROPT_MTU_SET_BY_USER,
 374         BROPT_VLAN_STATS_PER_PORT,
 375         BROPT_NO_LL_LEARN,
 376         BROPT_VLAN_BRIDGE_BINDING,
 377 };
 378
 379 struct net_bridge {
 380         spinlock_t                      lock;
 381         spinlock_t                      hash_lock;
 382         struct hlist_head               frame_type_list;
 383         struct net_device               *dev;
 384         unsigned long                   options;
 385         /* These fields are accessed on each packet */
 386 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 387         __be16                          vlan_proto;
 388         u16                             default_pvid;
 389         struct net_bridge_vlan_group    __rcu *vlgrp;
 390 #endif
 391
 392         struct rhashtable               fdb_hash_tbl;
 393         struct list_head                port_list;
 394 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 395         union {
 396                 struct rtable           fake_rtable;
 397                 struct rt6_info         fake_rt6_info;
 398         };
 399 #endif
 400         u16                             group_fwd_mask;
 401         u16                             group_fwd_mask_required;
 402
 403         /* STP */
 404         bridge_id                       designated_root;
 405         bridge_id                       bridge_id;
 406         unsigned char                   topology_change;
 407         unsigned char                   topology_change_detected;
 408         u16                             root_port;
 409         unsigned long                   max_age;
 410         unsigned long                   hello_time;
 411         unsigned long                   forward_delay;
 412         unsigned long                   ageing_time;
 413         unsigned long                   bridge_max_age;
 414         unsigned long                   bridge_hello_time;
 415         unsigned long                   bridge_forward_delay;
 416         unsigned long                   bridge_ageing_time;
 417         u32                             root_path_cost;
 418
 419         u8                              group_addr[ETH_ALEN];
 420
 421         enum {
 422                 BR_NO_STP,              /* no spanning tree */
 423                 BR_KERNEL_STP,          /* old STP in kernel */
 424                 BR_USER_STP,            /* new RSTP in userspace */
 425         } stp_enabled;
 426
 427 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 428
 429         u32                             hash_max;
 430
 431         u32                             multicast_last_member_count;
 432         u32                             multicast_startup_query_count;
 433
 434         u8                              multicast_igmp_version;
 435         u8                              multicast_router;
 436 #if IS_ENABLED(CONFIG_IPV6)
 437         u8                              multicast_mld_version;
 438 #endif
 439         spinlock_t                      multicast_lock;
 440         unsigned long                   multicast_last_member_interval;
 441         unsigned long                   multicast_membership_interval;
 442         unsigned long                   multicast_querier_interval;
 443         unsigned long                   multicast_query_interval;
 444         unsigned long                   multicast_query_response_interval;
 445         unsigned long                   multicast_startup_query_interval;
 446
 447         struct rhashtable               mdb_hash_tbl;
 448         struct rhashtable               sg_port_tbl;
 449
 450         struct hlist_head               mcast_gc_list;
 451         struct hlist_head               mdb_list;
 452         struct hlist_head               router_list;
 453
 454         struct timer_list               multicast_router_timer;
 455         struct bridge_mcast_other_query ip4_other_query;
 456         struct bridge_mcast_own_query   ip4_own_query;
 457         struct bridge_mcast_querier     ip4_querier;
 458         struct bridge_mcast_stats       __percpu *mcast_stats;
 459 #if IS_ENABLED(CONFIG_IPV6)
 460         struct bridge_mcast_other_query ip6_other_query;
 461         struct bridge_mcast_own_query   ip6_own_query;
 462         struct bridge_mcast_querier     ip6_querier;
 463 #endif /* IS_ENABLED(CONFIG_IPV6) */
 464         struct work_struct              mcast_gc_work;
 465 #endif
 466
 467         struct timer_list               hello_timer;
 468         struct timer_list               tcn_timer;
 469         struct timer_list               topology_change_timer;
 470         struct delayed_work             gc_work;
 471         struct kobject                  *ifobj;
 472         u32                             auto_cnt;
 473
 474 #ifdef CONFIG_NET_SWITCHDEV
 475         int offload_fwd_mark;
 476 #endif
 477         struct hlist_head               fdb_list;
 478
 479 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
 480         struct hlist_head               mrp_list;
 481 #endif
 482 #if IS_ENABLED(CONFIG_BRIDGE_CFM)
 483         struct hlist_head               mep_list;
 484 #endif
 485 };
 486
 487 struct br_input_skb_cb {
 488         struct net_device *brdev;
 489
 490         u16 frag_max_size;
 491 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 492         u8 igmp;
 493         u8 mrouters_only:1;
 494 #endif
 495         u8 proxyarp_replied:1;
 496         u8 src_port_isolated:1;
 497 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 498         u8 vlan_filtered:1;
 499 #endif
 500 #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
 501         u8 br_netfilter_broute:1;
 502 #endif
 503
 504 #ifdef CONFIG_NET_SWITCHDEV
 505         int offload_fwd_mark;
 506 #endif
 507 };
 508
 509 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 510
 511 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 512 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 513 #else
 514 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 515 #endif
 516
 517 #define br_printk(level, br, format, args...)   \
 518         printk(level "%s: " format, (br)->dev->name, ##args)
 519
 520 #define br_err(__br, format, args...)                   \
 521         br_printk(KERN_ERR, __br, format, ##args)
 522 #define br_warn(__br, format, args...)                  \
 523         br_printk(KERN_WARNING, __br, format, ##args)
 524 #define br_notice(__br, format, args...)                \
 525         br_printk(KERN_NOTICE, __br, format, ##args)
 526 #define br_info(__br, format, args...)                  \
 527         br_printk(KERN_INFO, __br, format, ##args)
 528
 529 #define br_debug(br, format, args...)                   \
 530         pr_debug("%s: " format,  (br)->dev->name, ##args)
 531
 532 /* called under bridge lock */
 533 static inline int br_is_root_bridge(const struct net_bridge *br)
 534 {
 535         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 536 }
 537
 538 /* check if a VLAN entry is global */
 539 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 540 {
 541         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 542 }
 543
 544 /* check if a VLAN entry is used by the bridge */
 545 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 546 {
 547         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 548 }
 549
 550 /* check if we should use the vlan entry, returns false if it's only context */
 551 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 552 {
 553         if (br_vlan_is_master(v)) {
 554                 if (br_vlan_is_brentry(v))
 555                         return true;
 556                 else
 557                         return false;
 558         }
 559
 560         return true;
 561 }
 562
 563 static inline bool nbp_state_should_learn(const struct net_bridge_port *p)
 564 {
 565         return p->state == BR_STATE_LEARNING || p->state == BR_STATE_FORWARDING;
 566 }
 567
 568 static inline bool br_vlan_valid_id(u16 vid, struct netlink_ext_ack *extack)
 569 {
 570         bool ret = vid > 0 && vid < VLAN_VID_MASK;
 571
 572         if (!ret)
 573                 NL_SET_ERR_MSG_MOD(extack, "Vlan id is invalid");
 574
 575         return ret;
 576 }
 577
 578 static inline bool br_vlan_valid_range(const struct bridge_vlan_info *cur,
 579                                        const struct bridge_vlan_info *last,
 580                                        struct netlink_ext_ack *extack)
 581 {
 582         /* pvid flag is not allowed in ranges */
 583         if (cur->flags & BRIDGE_VLAN_INFO_PVID) {
 584                 NL_SET_ERR_MSG_MOD(extack, "Pvid isn't allowed in a range");
 585                 return false;
 586         }
 587
 588         /* when cur is the range end, check if:
 589          *  - it has range start flag
 590          *  - range ids are invalid (end is equal to or before start)
 591          */
 592         if (last) {
 593                 if (cur->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 594                         NL_SET_ERR_MSG_MOD(extack, "Found a new vlan range start while processing one");
 595                         return false;
 596                 } else if (!(cur->flags & BRIDGE_VLAN_INFO_RANGE_END)) {
 597                         NL_SET_ERR_MSG_MOD(extack, "Vlan range end flag is missing");
 598                         return false;
 599                 } else if (cur->vid <= last->vid) {
 600                         NL_SET_ERR_MSG_MOD(extack, "End vlan id is less than or equal to start vlan id");
 601                         return false;
 602                 }
 603         }
 604
 605         /* check for required range flags */
 606         if (!(cur->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
 607                             BRIDGE_VLAN_INFO_RANGE_END))) {
 608                 NL_SET_ERR_MSG_MOD(extack, "Both vlan range flags are missing");
 609                 return false;
 610         }
 611
 612         return true;
 613 }
 614
 615 static inline int br_afspec_cmd_to_rtm(int cmd)
 616 {
 617         switch (cmd) {
 618         case RTM_SETLINK:
 619                 return RTM_NEWVLAN;
 620         case RTM_DELLINK:
 621                 return RTM_DELVLAN;
 622         }
 623
 624         return 0;
 625 }
 626
 627 static inline int br_opt_get(const struct net_bridge *br,
 628                              enum net_bridge_opts opt)
 629 {
 630         return test_bit(opt, &br->options);
 631 }
 632
 633 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
 634                       struct netlink_ext_ack *extack);
 635 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt);
 636 int br_boolopt_multi_toggle(struct net_bridge *br,
 637                             struct br_boolopt_multi *bm,
 638                             struct netlink_ext_ack *extack);
 639 void br_boolopt_multi_get(const struct net_bridge *br,
 640                           struct br_boolopt_multi *bm);
 641 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on);
 642
 643 /* br_device.c */
 644 void br_dev_setup(struct net_device *dev);
 645 void br_dev_delete(struct net_device *dev, struct list_head *list);
 646 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 647 #ifdef CONFIG_NET_POLL_CONTROLLER
 648 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 649                                        struct sk_buff *skb)
 650 {
 651         netpoll_send_skb(p->np, skb);
 652 }
 653
 654 int br_netpoll_enable(struct net_bridge_port *p);
 655 void br_netpoll_disable(struct net_bridge_port *p);
 656 #else
 657 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 658                                        struct sk_buff *skb)
 659 {
 660 }
 661
 662 static inline int br_netpoll_enable(struct net_bridge_port *p)
 663 {
 664         return 0;
 665 }
 666
 667 static inline void br_netpoll_disable(struct net_bridge_port *p)
 668 {
 669 }
 670 #endif
 671
 672 /* br_fdb.c */
 673 int br_fdb_init(void);
 674 void br_fdb_fini(void);
 675 int br_fdb_hash_init(struct net_bridge *br);
 676 void br_fdb_hash_fini(struct net_bridge *br);
 677 void br_fdb_flush(struct net_bridge *br);
 678 void br_fdb_find_delete_local(struct net_bridge *br,
 679                               const struct net_bridge_port *p,
 680                               const unsigned char *addr, u16 vid);
 681 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 682 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 683 void br_fdb_cleanup(struct work_struct *work);
 684 void br_fdb_delete_by_port(struct net_bridge *br,
 685                            const struct net_bridge_port *p, u16 vid, int do_all);
 686 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
 687                                              const unsigned char *addr,
 688                                              __u16 vid);
 689 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 690 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 691                    unsigned long off);
 692 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 693                   const unsigned char *addr, u16 vid);
 694 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 695                    const unsigned char *addr, u16 vid, unsigned long flags);
 696
 697 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 698                   struct net_device *dev, const unsigned char *addr, u16 vid);
 699 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 700                const unsigned char *addr, u16 vid, u16 nlh_flags,
 701                struct netlink_ext_ack *extack);
 702 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 703                 struct net_device *dev, struct net_device *fdev, int *idx);
 704 int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev,
 705                const unsigned char *addr, u16 vid, u32 portid, u32 seq,
 706                struct netlink_ext_ack *extack);
 707 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 708 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 709 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 710                               const unsigned char *addr, u16 vid,
 711                               bool swdev_notify);
 712 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 713                               const unsigned char *addr, u16 vid,
 714                               bool swdev_notify);
 715 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
 716                           const unsigned char *addr, u16 vid, bool offloaded);
 717
 718 /* br_forward.c */
 719 enum br_pkt_type {
 720         BR_PKT_UNICAST,
 721         BR_PKT_MULTICAST,
 722         BR_PKT_BROADCAST
 723 };
 724 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 725 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
 726                 bool local_rcv, bool local_orig);
 727 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 728 void br_flood(struct net_bridge *br, struct sk_buff *skb,
 729               enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
 730
 731 /* return true if both source port and dest port are isolated */
 732 static inline bool br_skb_isolated(const struct net_bridge_port *to,
 733                                    const struct sk_buff *skb)
 734 {
 735         return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
 736                (to->flags & BR_ISOLATED);
 737 }
 738
 739 /* br_if.c */
 740 void br_port_carrier_check(struct net_bridge_port *p, bool *notified);
 741 int br_add_bridge(struct net *net, const char *name);
 742 int br_del_bridge(struct net *net, const char *name);
 743 int br_add_if(struct net_bridge *br, struct net_device *dev,
 744               struct netlink_ext_ack *extack);
 745 int br_del_if(struct net_bridge *br, struct net_device *dev);
 746 void br_mtu_auto_adjust(struct net_bridge *br);
 747 netdev_features_t br_features_recompute(struct net_bridge *br,
 748                                         netdev_features_t features);
 749 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 750 void br_manage_promisc(struct net_bridge *br);
 751 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev);
 752
 753 /* br_input.c */
 754 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 755 rx_handler_func_t *br_get_rx_handler(const struct net_device *dev);
 756
 757 struct br_frame_type {
 758         __be16                  type;
 759         int                     (*frame_handler)(struct net_bridge_port *port,
 760                                                  struct sk_buff *skb);
 761         struct hlist_node       list;
 762 };
 763
 764 void br_add_frame(struct net_bridge *br, struct br_frame_type *ft);
 765 void br_del_frame(struct net_bridge *br, struct br_frame_type *ft);
 766
 767 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 768 {
 769         return rcu_dereference(dev->rx_handler) == br_get_rx_handler(dev);
 770 }
 771
 772 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev)
 773 {
 774         return rcu_dereference_rtnl(dev->rx_handler) == br_get_rx_handler(dev);
 775 }
 776
 777 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 778 {
 779         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 780 }
 781
 782 static inline struct net_bridge_port *
 783 br_port_get_check_rtnl(const struct net_device *dev)
 784 {
 785         return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL;
 786 }
 787
 788 /* br_ioctl.c */
 789 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 790 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 791                              void __user *arg);
 792
 793 /* br_multicast.c */
 794 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 795 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 796                      struct sk_buff *skb, u16 vid);
 797 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 798                                         struct sk_buff *skb, u16 vid);
 799 int br_multicast_add_port(struct net_bridge_port *port);
 800 void br_multicast_del_port(struct net_bridge_port *port);
 801 void br_multicast_enable_port(struct net_bridge_port *port);
 802 void br_multicast_disable_port(struct net_bridge_port *port);
 803 void br_multicast_init(struct net_bridge *br);
 804 void br_multicast_join_snoopers(struct net_bridge *br);
 805 void br_multicast_leave_snoopers(struct net_bridge *br);
 806 void br_multicast_open(struct net_bridge *br);
 807 void br_multicast_stop(struct net_bridge *br);
 808 void br_multicast_dev_del(struct net_bridge *br);
 809 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 810                         struct sk_buff *skb, bool local_rcv, bool local_orig);
 811 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 812 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 813 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 814 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 815 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 816 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
 817 #if IS_ENABLED(CONFIG_IPV6)
 818 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
 819 #endif
 820 struct net_bridge_mdb_entry *
 821 br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst);
 822 struct net_bridge_mdb_entry *
 823 br_multicast_new_group(struct net_bridge *br, struct br_ip *group);
 824 struct net_bridge_port_group *
 825 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 826                             struct net_bridge_port_group __rcu *next,
 827                             unsigned char flags, const unsigned char *src,
 828                             u8 filter_mode, u8 rt_protocol);
 829 int br_mdb_hash_init(struct net_bridge *br);
 830 void br_mdb_hash_fini(struct net_bridge *br);
 831 void br_mdb_notify(struct net_device *dev, struct net_bridge_mdb_entry *mp,
 832                    struct net_bridge_port_group *pg, int type);
 833 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 834                    int type);
 835 void br_multicast_del_pg(struct net_bridge_mdb_entry *mp,
 836                          struct net_bridge_port_group *pg,
 837                          struct net_bridge_port_group __rcu **pp);
 838 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
 839                         const struct sk_buff *skb, u8 type, u8 dir);
 840 int br_multicast_init_stats(struct net_bridge *br);
 841 void br_multicast_uninit_stats(struct net_bridge *br);
 842 void br_multicast_get_stats(const struct net_bridge *br,
 843                             const struct net_bridge_port *p,
 844                             struct br_mcast_stats *dest);
 845 void br_mdb_init(void);
 846 void br_mdb_uninit(void);
 847 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify);
 848 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify);
 849 void br_multicast_star_g_handle_mode(struct net_bridge_port_group *pg,
 850                                      u8 filter_mode);
 851 void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp,
 852                                        struct net_bridge_port_group *sg);
 853 struct net_bridge_group_src *
 854 br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip);
 855 void br_multicast_del_group_src(struct net_bridge_group_src *src,
 856                                 bool fastleave);
 857
 858 static inline bool br_group_is_l2(const struct br_ip *group)
 859 {
 860         return group->proto == 0;
 861 }
 862
 863 #define mlock_dereference(X, br) \
 864         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 865
 866 static inline bool br_multicast_is_router(struct net_bridge *br)
 867 {
 868         return br->multicast_router == 2 ||
 869                (br->multicast_router == 1 &&
 870                 timer_pending(&br->multicast_router_timer));
 871 }
 872
 873 static inline bool
 874 __br_multicast_querier_exists(struct net_bridge *br,
 875                                 struct bridge_mcast_other_query *querier,
 876                                 const bool is_ipv6)
 877 {
 878         bool own_querier_enabled;
 879
 880         if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
 881                 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR))
 882                         own_querier_enabled = false;
 883                 else
 884                         own_querier_enabled = true;
 885         } else {
 886                 own_querier_enabled = false;
 887         }
 888
 889         return time_is_before_jiffies(querier->delay_time) &&
 890                (own_querier_enabled || timer_pending(&querier->timer));
 891 }
 892
 893 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 894                                                struct ethhdr *eth,
 895                                                const struct net_bridge_mdb_entry *mdb)
 896 {
 897         switch (eth->h_proto) {
 898         case (htons(ETH_P_IP)):
 899                 return __br_multicast_querier_exists(br,
 900                         &br->ip4_other_query, false);
 901 #if IS_ENABLED(CONFIG_IPV6)
 902         case (htons(ETH_P_IPV6)):
 903                 return __br_multicast_querier_exists(br,
 904                         &br->ip6_other_query, true);
 905 #endif
 906         default:
 907                 return !!mdb && br_group_is_l2(&mdb->addr);
 908         }
 909 }
 910
 911 static inline bool br_multicast_is_star_g(const struct br_ip *ip)
 912 {
 913         switch (ip->proto) {
 914         case htons(ETH_P_IP):
 915                 return ipv4_is_zeronet(ip->src.ip4);
 916 #if IS_ENABLED(CONFIG_IPV6)
 917         case htons(ETH_P_IPV6):
 918                 return ipv6_addr_any(&ip->src.ip6);
 919 #endif
 920         default:
 921                 return false;
 922         }
 923 }
 924
 925 static inline bool br_multicast_should_handle_mode(const struct net_bridge *br,
 926                                                    __be16 proto)
 927 {
 928         switch (proto) {
 929         case htons(ETH_P_IP):
 930                 return !!(br->multicast_igmp_version == 3);
 931 #if IS_ENABLED(CONFIG_IPV6)
 932         case htons(ETH_P_IPV6):
 933                 return !!(br->multicast_mld_version == 2);
 934 #endif
 935         default:
 936                 return false;
 937         }
 938 }
 939
 940 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 941 {
 942         return BR_INPUT_SKB_CB(skb)->igmp;
 943 }
 944
 945 static inline unsigned long br_multicast_lmqt(const struct net_bridge *br)
 946 {
 947         return br->multicast_last_member_interval *
 948                br->multicast_last_member_count;
 949 }
 950
 951 static inline unsigned long br_multicast_gmi(const struct net_bridge *br)
 952 {
 953         /* use the RFC default of 2 for QRV */
 954         return 2 * br->multicast_query_interval +
 955                br->multicast_query_response_interval;
 956 }
 957 #else
 958 static inline int br_multicast_rcv(struct net_bridge *br,
 959                                    struct net_bridge_port *port,
 960                                    struct sk_buff *skb,
 961                                    u16 vid)
 962 {
 963         return 0;
 964 }
 965
 966 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 967                                                       struct sk_buff *skb, u16 vid)
 968 {
 969         return NULL;
 970 }
 971
 972 static inline int br_multicast_add_port(struct net_bridge_port *port)
 973 {
 974         return 0;
 975 }
 976
 977 static inline void br_multicast_del_port(struct net_bridge_port *port)
 978 {
 979 }
 980
 981 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 982 {
 983 }
 984
 985 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 986 {
 987 }
 988
 989 static inline void br_multicast_init(struct net_bridge *br)
 990 {
 991 }
 992
 993 static inline void br_multicast_join_snoopers(struct net_bridge *br)
 994 {
 995 }
 996
 997 static inline void br_multicast_leave_snoopers(struct net_bridge *br)
 998 {
 999 }
1000
1001 static inline void br_multicast_open(struct net_bridge *br)
1002 {
1003 }
1004
1005 static inline void br_multicast_stop(struct net_bridge *br)
1006 {
1007 }
1008
1009 static inline void br_multicast_dev_del(struct net_bridge *br)
1010 {
1011 }
1012
1013 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
1014                                       struct sk_buff *skb,
1015                                       bool local_rcv, bool local_orig)
1016 {
1017 }
1018
1019 static inline bool br_multicast_is_router(struct net_bridge *br)
1020 {
1021         return false;
1022 }
1023
1024 static inline bool br_multicast_querier_exists(struct net_bridge *br,
1025                                                struct ethhdr *eth,
1026                                                const struct net_bridge_mdb_entry *mdb)
1027 {
1028         return false;
1029 }
1030
1031 static inline void br_mdb_init(void)
1032 {
1033 }
1034
1035 static inline void br_mdb_uninit(void)
1036 {
1037 }
1038
1039 static inline int br_mdb_hash_init(struct net_bridge *br)
1040 {
1041         return 0;
1042 }
1043
1044 static inline void br_mdb_hash_fini(struct net_bridge *br)
1045 {
1046 }
1047
1048 static inline void br_multicast_count(struct net_bridge *br,
1049                                       const struct net_bridge_port *p,
1050                                       const struct sk_buff *skb,
1051                                       u8 type, u8 dir)
1052 {
1053 }
1054
1055 static inline int br_multicast_init_stats(struct net_bridge *br)
1056 {
1057         return 0;
1058 }
1059
1060 static inline void br_multicast_uninit_stats(struct net_bridge *br)
1061 {
1062 }
1063
1064 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
1065 {
1066         return 0;
1067 }
1068 #endif
1069
1070 /* br_vlan.c */
1071 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
1072 bool br_allowed_ingress(const struct net_bridge *br,
1073                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
1074                         u16 *vid, u8 *state);
1075 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
1076                        const struct sk_buff *skb);
1077 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
1078 struct sk_buff *br_handle_vlan(struct net_bridge *br,
1079                                const struct net_bridge_port *port,
1080                                struct net_bridge_vlan_group *vg,
1081                                struct sk_buff *skb);
1082 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
1083                 bool *changed, struct netlink_ext_ack *extack);
1084 int br_vlan_delete(struct net_bridge *br, u16 vid);
1085 void br_vlan_flush(struct net_bridge *br);
1086 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
1087 void br_recalculate_fwd_mask(struct net_bridge *br);
1088 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val,
1089                           struct netlink_ext_ack *extack);
1090 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto,
1091                         struct netlink_ext_ack *extack);
1092 int br_vlan_set_proto(struct net_bridge *br, unsigned long val,
1093                       struct netlink_ext_ack *extack);
1094 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
1095 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val);
1096 int br_vlan_init(struct net_bridge *br);
1097 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val,
1098                              struct netlink_ext_ack *extack);
1099 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
1100                                struct netlink_ext_ack *extack);
1101 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1102                  bool *changed, struct netlink_ext_ack *extack);
1103 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
1104 void nbp_vlan_flush(struct net_bridge_port *port);
1105 int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack);
1106 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
1107 void br_vlan_get_stats(const struct net_bridge_vlan *v,
1108                        struct pcpu_sw_netstats *stats);
1109 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event);
1110 int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
1111                          void *ptr);
1112 void br_vlan_rtnl_init(void);
1113 void br_vlan_rtnl_uninit(void);
1114 void br_vlan_notify(const struct net_bridge *br,
1115                     const struct net_bridge_port *p,
1116                     u16 vid, u16 vid_range,
1117                     int cmd);
1118 bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
1119                              const struct net_bridge_vlan *range_end);
1120
1121 void br_vlan_fill_forward_path_pvid(struct net_bridge *br,
1122                                     struct net_device_path_ctx *ctx,
1123                                     struct net_device_path *path);
1124 int br_vlan_fill_forward_path_mode(struct net_bridge *br,
1125                                    struct net_bridge_port *dst,
1126                                    struct net_device_path *path);
1127
1128 static inline struct net_bridge_vlan_group *br_vlan_group(
1129                                         const struct net_bridge *br)
1130 {
1131         return rtnl_dereference(br->vlgrp);
1132 }
1133
1134 static inline struct net_bridge_vlan_group *nbp_vlan_group(
1135                                         const struct net_bridge_port *p)
1136 {
1137         return rtnl_dereference(p->vlgrp);
1138 }
1139
1140 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1141                                         const struct net_bridge *br)
1142 {
1143         return rcu_dereference(br->vlgrp);
1144 }
1145
1146 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1147                                         const struct net_bridge_port *p)
1148 {
1149         return rcu_dereference(p->vlgrp);
1150 }
1151
1152 /* Since bridge now depends on 8021Q module, but the time bridge sees the
1153  * skb, the vlan tag will always be present if the frame was tagged.
1154  */
1155 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
1156 {
1157         int err = 0;
1158
1159         if (skb_vlan_tag_present(skb)) {
1160                 *vid = skb_vlan_tag_get_id(skb);
1161         } else {
1162                 *vid = 0;
1163                 err = -EINVAL;
1164         }
1165
1166         return err;
1167 }
1168
1169 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1170 {
1171         if (!vg)
1172                 return 0;
1173
1174         smp_rmb();
1175         return vg->pvid;
1176 }
1177
1178 static inline u16 br_vlan_flags(const struct net_bridge_vlan *v, u16 pvid)
1179 {
1180         return v->vid == pvid ? v->flags | BRIDGE_VLAN_INFO_PVID : v->flags;
1181 }
1182 #else
1183 static inline bool br_allowed_ingress(const struct net_bridge *br,
1184                                       struct net_bridge_vlan_group *vg,
1185                                       struct sk_buff *skb,
1186                                       u16 *vid, u8 *state)
1187 {
1188         return true;
1189 }
1190
1191 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
1192                                      const struct sk_buff *skb)
1193 {
1194         return true;
1195 }
1196
1197 static inline bool br_should_learn(struct net_bridge_port *p,
1198                                    struct sk_buff *skb, u16 *vid)
1199 {
1200         return true;
1201 }
1202
1203 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
1204                                              const struct net_bridge_port *port,
1205                                              struct net_bridge_vlan_group *vg,
1206                                              struct sk_buff *skb)
1207 {
1208         return skb;
1209 }
1210
1211 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
1212                               bool *changed, struct netlink_ext_ack *extack)
1213 {
1214         *changed = false;
1215         return -EOPNOTSUPP;
1216 }
1217
1218 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
1219 {
1220         return -EOPNOTSUPP;
1221 }
1222
1223 static inline void br_vlan_flush(struct net_bridge *br)
1224 {
1225 }
1226
1227 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
1228 {
1229 }
1230
1231 static inline int br_vlan_init(struct net_bridge *br)
1232 {
1233         return 0;
1234 }
1235
1236 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1237                                bool *changed, struct netlink_ext_ack *extack)
1238 {
1239         *changed = false;
1240         return -EOPNOTSUPP;
1241 }
1242
1243 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1244 {
1245         return -EOPNOTSUPP;
1246 }
1247
1248 static inline void nbp_vlan_flush(struct net_bridge_port *port)
1249 {
1250 }
1251
1252 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
1253                                                    u16 vid)
1254 {
1255         return NULL;
1256 }
1257
1258 static inline int nbp_vlan_init(struct net_bridge_port *port,
1259                                 struct netlink_ext_ack *extack)
1260 {
1261         return 0;
1262 }
1263
1264 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
1265 {
1266         return 0;
1267 }
1268
1269 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1270 {
1271         return 0;
1272 }
1273
1274 static inline int br_vlan_filter_toggle(struct net_bridge *br,
1275                                         unsigned long val,
1276                                         struct netlink_ext_ack *extack)
1277 {
1278         return -EOPNOTSUPP;
1279 }
1280
1281 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
1282                                          u32 filter_mask)
1283 {
1284         return 0;
1285 }
1286
1287 static inline void br_vlan_fill_forward_path_pvid(struct net_bridge *br,
1288                                                   struct net_device_path_ctx *ctx,
1289                                                   struct net_device_path *path)
1290 {
1291 }
1292
1293 static inline int br_vlan_fill_forward_path_mode(struct net_bridge *br,
1294                                                  struct net_bridge_port *dst,
1295                                                  struct net_device_path *path)
1296 {
1297         return 0;
1298 }
1299
1300 static inline struct net_bridge_vlan_group *br_vlan_group(
1301                                         const struct net_bridge *br)
1302 {
1303         return NULL;
1304 }
1305
1306 static inline struct net_bridge_vlan_group *nbp_vlan_group(
1307                                         const struct net_bridge_port *p)
1308 {
1309         return NULL;
1310 }
1311
1312 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1313                                         const struct net_bridge *br)
1314 {
1315         return NULL;
1316 }
1317
1318 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1319                                         const struct net_bridge_port *p)
1320 {
1321         return NULL;
1322 }
1323
1324 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
1325                                      struct pcpu_sw_netstats *stats)
1326 {
1327 }
1328
1329 static inline void br_vlan_port_event(struct net_bridge_port *p,
1330                                       unsigned long event)
1331 {
1332 }
1333
1334 static inline int br_vlan_bridge_event(struct net_device *dev,
1335                                        unsigned long event, void *ptr)
1336 {
1337         return 0;
1338 }
1339
1340 static inline void br_vlan_rtnl_init(void)
1341 {
1342 }
1343
1344 static inline void br_vlan_rtnl_uninit(void)
1345 {
1346 }
1347
1348 static inline void br_vlan_notify(const struct net_bridge *br,
1349                                   const struct net_bridge_port *p,
1350                                   u16 vid, u16 vid_range,
1351                                   int cmd)
1352 {
1353 }
1354
1355 static inline bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
1356                                            const struct net_bridge_vlan *range_end)
1357 {
1358         return true;
1359 }
1360 #endif
1361
1362 /* br_vlan_options.c */
1363 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
1364 bool br_vlan_opts_eq_range(const struct net_bridge_vlan *v_curr,
1365                            const struct net_bridge_vlan *range_end);
1366 bool br_vlan_opts_fill(struct sk_buff *skb, const struct net_bridge_vlan *v);
1367 size_t br_vlan_opts_nl_size(void);
1368 int br_vlan_process_options(const struct net_bridge *br,
1369                             const struct net_bridge_port *p,
1370                             struct net_bridge_vlan *range_start,
1371                             struct net_bridge_vlan *range_end,
1372                             struct nlattr **tb,
1373                             struct netlink_ext_ack *extack);
1374
1375 /* vlan state manipulation helpers using *_ONCE to annotate lock-free access */
1376 static inline u8 br_vlan_get_state(const struct net_bridge_vlan *v)
1377 {
1378         return READ_ONCE(v->state);
1379 }
1380
1381 static inline void br_vlan_set_state(struct net_bridge_vlan *v, u8 state)
1382 {
1383         WRITE_ONCE(v->state, state);
1384 }
1385
1386 static inline u8 br_vlan_get_pvid_state(const struct net_bridge_vlan_group *vg)
1387 {
1388         return READ_ONCE(vg->pvid_state);
1389 }
1390
1391 static inline void br_vlan_set_pvid_state(struct net_bridge_vlan_group *vg,
1392                                           u8 state)
1393 {
1394         WRITE_ONCE(vg->pvid_state, state);
1395 }
1396
1397 /* learn_allow is true at ingress and false at egress */
1398 static inline bool br_vlan_state_allowed(u8 state, bool learn_allow)
1399 {
1400         switch (state) {
1401         case BR_STATE_LEARNING:
1402                 return learn_allow;
1403         case BR_STATE_FORWARDING:
1404                 return true;
1405         default:
1406                 return false;
1407         }
1408 }
1409 #endif
1410
1411 struct nf_br_ops {
1412         int (*br_dev_xmit_hook)(struct sk_buff *skb);
1413 };
1414 extern const struct nf_br_ops __rcu *nf_br_ops;
1415
1416 /* br_netfilter.c */
1417 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1418 int br_nf_core_init(void);
1419 void br_nf_core_fini(void);
1420 void br_netfilter_rtable_init(struct net_bridge *);
1421 #else
1422 static inline int br_nf_core_init(void) { return 0; }
1423 static inline void br_nf_core_fini(void) {}
1424 #define br_netfilter_rtable_init(x)
1425 #endif
1426
1427 /* br_stp.c */
1428 void br_set_state(struct net_bridge_port *p, unsigned int state);
1429 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1430 void br_init_port(struct net_bridge_port *p);
1431 void br_become_designated_port(struct net_bridge_port *p);
1432
1433 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1434 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1435 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1436 int br_set_max_age(struct net_bridge *br, unsigned long x);
1437 int __set_ageing_time(struct net_device *dev, unsigned long t);
1438 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1439
1440
1441 /* br_stp_if.c */
1442 void br_stp_enable_bridge(struct net_bridge *br);
1443 void br_stp_disable_bridge(struct net_bridge *br);
1444 int br_stp_set_enabled(struct net_bridge *br, unsigned long val,
1445                        struct netlink_ext_ack *extack);
1446 void br_stp_enable_port(struct net_bridge_port *p);
1447 void br_stp_disable_port(struct net_bridge_port *p);
1448 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1449 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1450 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1451 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1452 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1453 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1454
1455 /* br_stp_bpdu.c */
1456 struct stp_proto;
1457 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1458                 struct net_device *dev);
1459
1460 /* br_stp_timer.c */
1461 void br_stp_timer_init(struct net_bridge *br);
1462 void br_stp_port_timer_init(struct net_bridge_port *p);
1463 unsigned long br_timer_value(const struct timer_list *timer);
1464
1465 /* br.c */
1466 #if IS_ENABLED(CONFIG_ATM_LANE)
1467 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1468 #endif
1469
1470 /* br_mrp.c */
1471 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
1472 int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
1473                  struct nlattr *attr, int cmd, struct netlink_ext_ack *extack);
1474 bool br_mrp_enabled(struct net_bridge *br);
1475 void br_mrp_port_del(struct net_bridge *br, struct net_bridge_port *p);
1476 int br_mrp_fill_info(struct sk_buff *skb, struct net_bridge *br);
1477 #else
1478 static inline int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
1479                                struct nlattr *attr, int cmd,
1480                                struct netlink_ext_ack *extack)
1481 {
1482         return -EOPNOTSUPP;
1483 }
1484
1485 static inline bool br_mrp_enabled(struct net_bridge *br)
1486 {
1487         return false;
1488 }
1489
1490 static inline void br_mrp_port_del(struct net_bridge *br,
1491                                    struct net_bridge_port *p)
1492 {
1493 }
1494
1495 static inline int br_mrp_fill_info(struct sk_buff *skb, struct net_bridge *br)
1496 {
1497         return 0;
1498 }
1499
1500 #endif
1501
1502 /* br_cfm.c */
1503 #if IS_ENABLED(CONFIG_BRIDGE_CFM)
1504 int br_cfm_parse(struct net_bridge *br, struct net_bridge_port *p,
1505                  struct nlattr *attr, int cmd, struct netlink_ext_ack *extack);
1506 bool br_cfm_created(struct net_bridge *br);
1507 void br_cfm_port_del(struct net_bridge *br, struct net_bridge_port *p);
1508 int br_cfm_config_fill_info(struct sk_buff *skb, struct net_bridge *br);
1509 int br_cfm_status_fill_info(struct sk_buff *skb,
1510                             struct net_bridge *br,
1511                             bool getlink);
1512 int br_cfm_mep_count(struct net_bridge *br, u32 *count);
1513 int br_cfm_peer_mep_count(struct net_bridge *br, u32 *count);
1514 #else
1515 static inline int br_cfm_parse(struct net_bridge *br, struct net_bridge_port *p,
1516                                struct nlattr *attr, int cmd,
1517                                struct netlink_ext_ack *extack)
1518 {
1519         return -EOPNOTSUPP;
1520 }
1521
1522 static inline bool br_cfm_created(struct net_bridge *br)
1523 {
1524         return false;
1525 }
1526
1527 static inline void br_cfm_port_del(struct net_bridge *br,
1528                                    struct net_bridge_port *p)
1529 {
1530 }
1531
1532 static inline int br_cfm_config_fill_info(struct sk_buff *skb, struct net_bridge *br)
1533 {
1534         return -EOPNOTSUPP;
1535 }
1536
1537 static inline int br_cfm_status_fill_info(struct sk_buff *skb,
1538                                           struct net_bridge *br,
1539                                           bool getlink)
1540 {
1541         return -EOPNOTSUPP;
1542 }
1543
1544 static inline int br_cfm_mep_count(struct net_bridge *br, u32 *count)
1545 {
1546         return -EOPNOTSUPP;
1547 }
1548
1549 static inline int br_cfm_peer_mep_count(struct net_bridge *br, u32 *count)
1550 {
1551         return -EOPNOTSUPP;
1552 }
1553 #endif
1554
1555 /* br_netlink.c */
1556 extern struct rtnl_link_ops br_link_ops;
1557 int br_netlink_init(void);
1558 void br_netlink_fini(void);
1559 void br_ifinfo_notify(int event, const struct net_bridge *br,
1560                       const struct net_bridge_port *port);
1561 void br_info_notify(int event, const struct net_bridge *br,
1562                     const struct net_bridge_port *port, u32 filter);
1563 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags,
1564                struct netlink_ext_ack *extack);
1565 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1566 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1567                u32 filter_mask, int nlflags);
1568 int br_process_vlan_info(struct net_bridge *br,
1569                          struct net_bridge_port *p, int cmd,
1570                          struct bridge_vlan_info *vinfo_curr,
1571                          struct bridge_vlan_info **vinfo_last,
1572                          bool *changed,
1573                          struct netlink_ext_ack *extack);
1574
1575 #ifdef CONFIG_SYSFS
1576 /* br_sysfs_if.c */
1577 extern const struct sysfs_ops brport_sysfs_ops;
1578 int br_sysfs_addif(struct net_bridge_port *p);
1579 int br_sysfs_renameif(struct net_bridge_port *p);
1580
1581 /* br_sysfs_br.c */
1582 int br_sysfs_addbr(struct net_device *dev);
1583 void br_sysfs_delbr(struct net_device *dev);
1584
1585 #else
1586
1587 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1588 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1589 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1590 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1591 #endif /* CONFIG_SYSFS */
1592
1593 /* br_switchdev.c */
1594 #ifdef CONFIG_NET_SWITCHDEV
1595 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1596 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1597                               struct sk_buff *skb);
1598 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1599                                   const struct sk_buff *skb);
1600 int br_switchdev_set_port_flag(struct net_bridge_port *p,
1601                                unsigned long flags,
1602                                unsigned long mask,
1603                                struct netlink_ext_ack *extack);
1604 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
1605                              int type);
1606 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
1607                                struct netlink_ext_ack *extack);
1608 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
1609
1610 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1611 {
1612         skb->offload_fwd_mark = 0;
1613 }
1614 #else
1615 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1616 {
1617         return 0;
1618 }
1619
1620 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1621                                             struct sk_buff *skb)
1622 {
1623 }
1624
1625 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1626                                                 const struct sk_buff *skb)
1627 {
1628         return true;
1629 }
1630
1631 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1632                                              unsigned long flags,
1633                                              unsigned long mask,
1634                                              struct netlink_ext_ack *extack)
1635 {
1636         return 0;
1637 }
1638
1639 static inline int br_switchdev_port_vlan_add(struct net_device *dev,
1640                                              u16 vid, u16 flags,
1641                                              struct netlink_ext_ack *extack)
1642 {
1643         return -EOPNOTSUPP;
1644 }
1645
1646 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
1647 {
1648         return -EOPNOTSUPP;
1649 }
1650
1651 static inline void
1652 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
1653 {
1654 }
1655
1656 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1657 {
1658 }
1659 #endif /* CONFIG_NET_SWITCHDEV */
1660
1661 /* br_arp_nd_proxy.c */
1662 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br);
1663 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
1664                               u16 vid, struct net_bridge_port *p);
1665 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
1666                        u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
1667 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);
1668 #endif