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 typedef struct bridge_id bridge_id;
  52 typedef struct mac_addr mac_addr;
  53 typedef __u16 port_id;
  54
  55 struct bridge_id {
  56         unsigned char   prio[2];
  57         unsigned char   addr[ETH_ALEN];
  58 };
  59
  60 struct mac_addr {
  61         unsigned char   addr[ETH_ALEN];
  62 };
  63
  64 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  65 /* our own querier */
  66 struct bridge_mcast_own_query {
  67         struct timer_list       timer;
  68         u32                     startup_sent;
  69 };
  70
  71 /* other querier */
  72 struct bridge_mcast_other_query {
  73         struct timer_list               timer;
  74         unsigned long                   delay_time;
  75 };
  76
  77 /* selected querier */
  78 struct bridge_mcast_querier {
  79         struct br_ip addr;
  80         struct net_bridge_port __rcu    *port;
  81 };
  82
  83 /* IGMP/MLD statistics */
  84 struct bridge_mcast_stats {
  85         struct br_mcast_stats mstats;
  86         struct u64_stats_sync syncp;
  87 };
  88 #endif
  89
  90 struct br_vlan_stats {
  91         u64 rx_bytes;
  92         u64 rx_packets;
  93         u64 tx_bytes;
  94         u64 tx_packets;
  95         struct u64_stats_sync syncp;
  96 };
  97
  98 struct br_tunnel_info {
  99         __be64                  tunnel_id;
 100         struct metadata_dst     *tunnel_dst;
 101 };
 102
 103 /* private vlan flags */
 104 enum {
 105         BR_VLFLAG_PER_PORT_STATS = BIT(0),
 106         BR_VLFLAG_ADDED_BY_SWITCHDEV = BIT(1),
 107 };
 108
 109 /**
 110  * struct net_bridge_vlan - per-vlan entry
 111  *
 112  * @vnode: rhashtable member
 113  * @vid: VLAN id
 114  * @flags: bridge vlan flags
 115  * @priv_flags: private (in-kernel) bridge vlan flags
 116  * @state: STP state (e.g. blocking, learning, forwarding)
 117  * @stats: per-cpu VLAN statistics
 118  * @br: if MASTER flag set, this points to a bridge struct
 119  * @port: if MASTER flag unset, this points to a port struct
 120  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
 121  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
 122  *          for this VLAN entry
 123  * @vlist: sorted list of VLAN entries
 124  * @rcu: used for entry destruction
 125  *
 126  * This structure is shared between the global per-VLAN entries contained in
 127  * the bridge rhashtable and the local per-port per-VLAN entries contained in
 128  * the port's rhashtable. The union entries should be interpreted depending on
 129  * the entry flags that are set.
 130  */
 131 struct net_bridge_vlan {
 132         struct rhash_head               vnode;
 133         struct rhash_head               tnode;
 134         u16                             vid;
 135         u16                             flags;
 136         u16                             priv_flags;
 137         u8                              state;
 138         struct br_vlan_stats __percpu   *stats;
 139         union {
 140                 struct net_bridge       *br;
 141                 struct net_bridge_port  *port;
 142         };
 143         union {
 144                 refcount_t              refcnt;
 145                 struct net_bridge_vlan  *brvlan;
 146         };
 147
 148         struct br_tunnel_info           tinfo;
 149
 150         struct list_head                vlist;
 151
 152         struct rcu_head                 rcu;
 153 };
 154
 155 /**
 156  * struct net_bridge_vlan_group
 157  *
 158  * @vlan_hash: VLAN entry rhashtable
 159  * @vlan_list: sorted VLAN entry list
 160  * @num_vlans: number of total VLAN entries
 161  * @pvid: PVID VLAN id
 162  * @pvid_state: PVID's STP state (e.g. forwarding, learning, blocking)
 163  *
 164  * IMPORTANT: Be careful when checking if there're VLAN entries using list
 165  *            primitives because the bridge can have entries in its list which
 166  *            are just for global context but not for filtering, i.e. they have
 167  *            the master flag set but not the brentry flag. If you have to check
 168  *            if there're "real" entries in the bridge please test @num_vlans
 169  */
 170 struct net_bridge_vlan_group {
 171         struct rhashtable               vlan_hash;
 172         struct rhashtable               tunnel_hash;
 173         struct list_head                vlan_list;
 174         u16                             num_vlans;
 175         u16                             pvid;
 176         u8                              pvid_state;
 177 };
 178
 179 /* bridge fdb flags */
 180 enum {
 181         BR_FDB_LOCAL,
 182         BR_FDB_STATIC,
 183         BR_FDB_STICKY,
 184         BR_FDB_ADDED_BY_USER,
 185         BR_FDB_ADDED_BY_EXT_LEARN,
 186         BR_FDB_OFFLOADED,
 187 };
 188
 189 struct net_bridge_fdb_key {
 190         mac_addr addr;
 191         u16 vlan_id;
 192 };
 193
 194 struct net_bridge_fdb_entry {
 195         struct rhash_head               rhnode;
 196         struct net_bridge_port          *dst;
 197
 198         struct net_bridge_fdb_key       key;
 199         struct hlist_node               fdb_node;
 200         unsigned long                   flags;
 201
 202         /* write-heavy members should not affect lookups */
 203         unsigned long                   updated ____cacheline_aligned_in_smp;
 204         unsigned long                   used;
 205
 206         struct rcu_head                 rcu;
 207 };
 208
 209 #define MDB_PG_FLAGS_PERMANENT  BIT(0)
 210 #define MDB_PG_FLAGS_OFFLOAD    BIT(1)
 211 #define MDB_PG_FLAGS_FAST_LEAVE BIT(2)
 212
 213 struct net_bridge_port_group {
 214         struct net_bridge_port          *port;
 215         struct net_bridge_port_group __rcu *next;
 216         struct hlist_node               mglist;
 217         struct rcu_head                 rcu;
 218         struct timer_list               timer;
 219         struct br_ip                    addr;
 220         unsigned char                   flags;
 221         unsigned char                   eth_addr[ETH_ALEN];
 222 };
 223
 224 struct net_bridge_mdb_entry {
 225         struct rhash_head               rhnode;
 226         struct net_bridge               *br;
 227         struct net_bridge_port_group __rcu *ports;
 228         struct rcu_head                 rcu;
 229         struct timer_list               timer;
 230         struct br_ip                    addr;
 231         bool                            host_joined;
 232         struct hlist_node               mdb_node;
 233 };
 234
 235 struct net_bridge_port {
 236         struct net_bridge               *br;
 237         struct net_device               *dev;
 238         struct list_head                list;
 239
 240         unsigned long                   flags;
 241 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 242         struct net_bridge_vlan_group    __rcu *vlgrp;
 243 #endif
 244         struct net_bridge_port          __rcu *backup_port;
 245
 246         /* STP */
 247         u8                              priority;
 248         u8                              state;
 249         u16                             port_no;
 250         unsigned char                   topology_change_ack;
 251         unsigned char                   config_pending;
 252         port_id                         port_id;
 253         port_id                         designated_port;
 254         bridge_id                       designated_root;
 255         bridge_id                       designated_bridge;
 256         u32                             path_cost;
 257         u32                             designated_cost;
 258         unsigned long                   designated_age;
 259
 260         struct timer_list               forward_delay_timer;
 261         struct timer_list               hold_timer;
 262         struct timer_list               message_age_timer;
 263         struct kobject                  kobj;
 264         struct rcu_head                 rcu;
 265
 266 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 267         struct bridge_mcast_own_query   ip4_own_query;
 268 #if IS_ENABLED(CONFIG_IPV6)
 269         struct bridge_mcast_own_query   ip6_own_query;
 270 #endif /* IS_ENABLED(CONFIG_IPV6) */
 271         unsigned char                   multicast_router;
 272         struct bridge_mcast_stats       __percpu *mcast_stats;
 273         struct timer_list               multicast_router_timer;
 274         struct hlist_head               mglist;
 275         struct hlist_node               rlist;
 276 #endif
 277
 278 #ifdef CONFIG_SYSFS
 279         char                            sysfs_name[IFNAMSIZ];
 280 #endif
 281
 282 #ifdef CONFIG_NET_POLL_CONTROLLER
 283         struct netpoll                  *np;
 284 #endif
 285 #ifdef CONFIG_NET_SWITCHDEV
 286         int                             offload_fwd_mark;
 287 #endif
 288         u16                             group_fwd_mask;
 289         u16                             backup_redirected_cnt;
 290
 291         struct bridge_stp_xstats        stp_xstats;
 292 };
 293
 294 #define kobj_to_brport(obj)     container_of(obj, struct net_bridge_port, kobj)
 295
 296 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 297 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 298
 299 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 300 {
 301         return rcu_dereference(dev->rx_handler_data);
 302 }
 303
 304 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 305 {
 306         return netif_is_bridge_port(dev) ?
 307                 rtnl_dereference(dev->rx_handler_data) : NULL;
 308 }
 309
 310 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev)
 311 {
 312         return netif_is_bridge_port(dev) ?
 313                 rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
 314 }
 315
 316 enum net_bridge_opts {
 317         BROPT_VLAN_ENABLED,
 318         BROPT_VLAN_STATS_ENABLED,
 319         BROPT_NF_CALL_IPTABLES,
 320         BROPT_NF_CALL_IP6TABLES,
 321         BROPT_NF_CALL_ARPTABLES,
 322         BROPT_GROUP_ADDR_SET,
 323         BROPT_MULTICAST_ENABLED,
 324         BROPT_MULTICAST_QUERIER,
 325         BROPT_MULTICAST_QUERY_USE_IFADDR,
 326         BROPT_MULTICAST_STATS_ENABLED,
 327         BROPT_HAS_IPV6_ADDR,
 328         BROPT_NEIGH_SUPPRESS_ENABLED,
 329         BROPT_MTU_SET_BY_USER,
 330         BROPT_VLAN_STATS_PER_PORT,
 331         BROPT_NO_LL_LEARN,
 332         BROPT_VLAN_BRIDGE_BINDING,
 333 };
 334
 335 struct net_bridge {
 336         spinlock_t                      lock;
 337         spinlock_t                      hash_lock;
 338         struct list_head                port_list;
 339         struct net_device               *dev;
 340         struct pcpu_sw_netstats         __percpu *stats;
 341         unsigned long                   options;
 342         /* These fields are accessed on each packet */
 343 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 344         __be16                          vlan_proto;
 345         u16                             default_pvid;
 346         struct net_bridge_vlan_group    __rcu *vlgrp;
 347 #endif
 348
 349         struct rhashtable               fdb_hash_tbl;
 350 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 351         union {
 352                 struct rtable           fake_rtable;
 353                 struct rt6_info         fake_rt6_info;
 354         };
 355 #endif
 356         u16                             group_fwd_mask;
 357         u16                             group_fwd_mask_required;
 358
 359         /* STP */
 360         bridge_id                       designated_root;
 361         bridge_id                       bridge_id;
 362         unsigned char                   topology_change;
 363         unsigned char                   topology_change_detected;
 364         u16                             root_port;
 365         unsigned long                   max_age;
 366         unsigned long                   hello_time;
 367         unsigned long                   forward_delay;
 368         unsigned long                   ageing_time;
 369         unsigned long                   bridge_max_age;
 370         unsigned long                   bridge_hello_time;
 371         unsigned long                   bridge_forward_delay;
 372         unsigned long                   bridge_ageing_time;
 373         u32                             root_path_cost;
 374
 375         u8                              group_addr[ETH_ALEN];
 376
 377         enum {
 378                 BR_NO_STP,              /* no spanning tree */
 379                 BR_KERNEL_STP,          /* old STP in kernel */
 380                 BR_USER_STP,            /* new RSTP in userspace */
 381         } stp_enabled;
 382
 383 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 384
 385         u32                             hash_max;
 386
 387         u32                             multicast_last_member_count;
 388         u32                             multicast_startup_query_count;
 389
 390         u8                              multicast_igmp_version;
 391         u8                              multicast_router;
 392 #if IS_ENABLED(CONFIG_IPV6)
 393         u8                              multicast_mld_version;
 394 #endif
 395         spinlock_t                      multicast_lock;
 396         unsigned long                   multicast_last_member_interval;
 397         unsigned long                   multicast_membership_interval;
 398         unsigned long                   multicast_querier_interval;
 399         unsigned long                   multicast_query_interval;
 400         unsigned long                   multicast_query_response_interval;
 401         unsigned long                   multicast_startup_query_interval;
 402
 403         struct rhashtable               mdb_hash_tbl;
 404
 405         struct hlist_head               mdb_list;
 406         struct hlist_head               router_list;
 407
 408         struct timer_list               multicast_router_timer;
 409         struct bridge_mcast_other_query ip4_other_query;
 410         struct bridge_mcast_own_query   ip4_own_query;
 411         struct bridge_mcast_querier     ip4_querier;
 412         struct bridge_mcast_stats       __percpu *mcast_stats;
 413 #if IS_ENABLED(CONFIG_IPV6)
 414         struct bridge_mcast_other_query ip6_other_query;
 415         struct bridge_mcast_own_query   ip6_own_query;
 416         struct bridge_mcast_querier     ip6_querier;
 417 #endif /* IS_ENABLED(CONFIG_IPV6) */
 418 #endif
 419
 420         struct timer_list               hello_timer;
 421         struct timer_list               tcn_timer;
 422         struct timer_list               topology_change_timer;
 423         struct delayed_work             gc_work;
 424         struct kobject                  *ifobj;
 425         u32                             auto_cnt;
 426
 427 #ifdef CONFIG_NET_SWITCHDEV
 428         int offload_fwd_mark;
 429 #endif
 430         struct hlist_head               fdb_list;
 431
 432 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
 433         struct list_head                __rcu mrp_list;
 434 #endif
 435 };
 436
 437 struct br_input_skb_cb {
 438         struct net_device *brdev;
 439
 440         u16 frag_max_size;
 441 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 442         u8 igmp;
 443         u8 mrouters_only:1;
 444 #endif
 445         u8 proxyarp_replied:1;
 446         u8 src_port_isolated:1;
 447 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 448         u8 vlan_filtered:1;
 449 #endif
 450 #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
 451         u8 br_netfilter_broute:1;
 452 #endif
 453
 454 #ifdef CONFIG_NET_SWITCHDEV
 455         int offload_fwd_mark;
 456 #endif
 457 };
 458
 459 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 460
 461 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 462 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 463 #else
 464 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 465 #endif
 466
 467 #define br_printk(level, br, format, args...)   \
 468         printk(level "%s: " format, (br)->dev->name, ##args)
 469
 470 #define br_err(__br, format, args...)                   \
 471         br_printk(KERN_ERR, __br, format, ##args)
 472 #define br_warn(__br, format, args...)                  \
 473         br_printk(KERN_WARNING, __br, format, ##args)
 474 #define br_notice(__br, format, args...)                \
 475         br_printk(KERN_NOTICE, __br, format, ##args)
 476 #define br_info(__br, format, args...)                  \
 477         br_printk(KERN_INFO, __br, format, ##args)
 478
 479 #define br_debug(br, format, args...)                   \
 480         pr_debug("%s: " format,  (br)->dev->name, ##args)
 481
 482 /* called under bridge lock */
 483 static inline int br_is_root_bridge(const struct net_bridge *br)
 484 {
 485         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 486 }
 487
 488 /* check if a VLAN entry is global */
 489 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 490 {
 491         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 492 }
 493
 494 /* check if a VLAN entry is used by the bridge */
 495 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 496 {
 497         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 498 }
 499
 500 /* check if we should use the vlan entry, returns false if it's only context */
 501 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 502 {
 503         if (br_vlan_is_master(v)) {
 504                 if (br_vlan_is_brentry(v))
 505                         return true;
 506                 else
 507                         return false;
 508         }
 509
 510         return true;
 511 }
 512
 513 static inline bool nbp_state_should_learn(const struct net_bridge_port *p)
 514 {
 515         return p->state == BR_STATE_LEARNING || p->state == BR_STATE_FORWARDING;
 516 }
 517
 518 static inline bool br_vlan_valid_id(u16 vid, struct netlink_ext_ack *extack)
 519 {
 520         bool ret = vid > 0 && vid < VLAN_VID_MASK;
 521
 522         if (!ret)
 523                 NL_SET_ERR_MSG_MOD(extack, "Vlan id is invalid");
 524
 525         return ret;
 526 }
 527
 528 static inline bool br_vlan_valid_range(const struct bridge_vlan_info *cur,
 529                                        const struct bridge_vlan_info *last,
 530                                        struct netlink_ext_ack *extack)
 531 {
 532         /* pvid flag is not allowed in ranges */
 533         if (cur->flags & BRIDGE_VLAN_INFO_PVID) {
 534                 NL_SET_ERR_MSG_MOD(extack, "Pvid isn't allowed in a range");
 535                 return false;
 536         }
 537
 538         /* when cur is the range end, check if:
 539          *  - it has range start flag
 540          *  - range ids are invalid (end is equal to or before start)
 541          */
 542         if (last) {
 543                 if (cur->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 544                         NL_SET_ERR_MSG_MOD(extack, "Found a new vlan range start while processing one");
 545                         return false;
 546                 } else if (!(cur->flags & BRIDGE_VLAN_INFO_RANGE_END)) {
 547                         NL_SET_ERR_MSG_MOD(extack, "Vlan range end flag is missing");
 548                         return false;
 549                 } else if (cur->vid <= last->vid) {
 550                         NL_SET_ERR_MSG_MOD(extack, "End vlan id is less than or equal to start vlan id");
 551                         return false;
 552                 }
 553         }
 554
 555         /* check for required range flags */
 556         if (!(cur->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
 557                             BRIDGE_VLAN_INFO_RANGE_END))) {
 558                 NL_SET_ERR_MSG_MOD(extack, "Both vlan range flags are missing");
 559                 return false;
 560         }
 561
 562         return true;
 563 }
 564
 565 static inline int br_afspec_cmd_to_rtm(int cmd)
 566 {
 567         switch (cmd) {
 568         case RTM_SETLINK:
 569                 return RTM_NEWVLAN;
 570         case RTM_DELLINK:
 571                 return RTM_DELVLAN;
 572         }
 573
 574         return 0;
 575 }
 576
 577 static inline int br_opt_get(const struct net_bridge *br,
 578                              enum net_bridge_opts opt)
 579 {
 580         return test_bit(opt, &br->options);
 581 }
 582
 583 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
 584                       struct netlink_ext_ack *extack);
 585 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt);
 586 int br_boolopt_multi_toggle(struct net_bridge *br,
 587                             struct br_boolopt_multi *bm,
 588                             struct netlink_ext_ack *extack);
 589 void br_boolopt_multi_get(const struct net_bridge *br,
 590                           struct br_boolopt_multi *bm);
 591 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on);
 592
 593 /* br_device.c */
 594 void br_dev_setup(struct net_device *dev);
 595 void br_dev_delete(struct net_device *dev, struct list_head *list);
 596 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 597 #ifdef CONFIG_NET_POLL_CONTROLLER
 598 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 599                                        struct sk_buff *skb)
 600 {
 601         struct netpoll *np = p->np;
 602
 603         if (np)
 604                 netpoll_send_skb(np, skb);
 605 }
 606
 607 int br_netpoll_enable(struct net_bridge_port *p);
 608 void br_netpoll_disable(struct net_bridge_port *p);
 609 #else
 610 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 611                                        struct sk_buff *skb)
 612 {
 613 }
 614
 615 static inline int br_netpoll_enable(struct net_bridge_port *p)
 616 {
 617         return 0;
 618 }
 619
 620 static inline void br_netpoll_disable(struct net_bridge_port *p)
 621 {
 622 }
 623 #endif
 624
 625 /* br_fdb.c */
 626 int br_fdb_init(void);
 627 void br_fdb_fini(void);
 628 int br_fdb_hash_init(struct net_bridge *br);
 629 void br_fdb_hash_fini(struct net_bridge *br);
 630 void br_fdb_flush(struct net_bridge *br);
 631 void br_fdb_find_delete_local(struct net_bridge *br,
 632                               const struct net_bridge_port *p,
 633                               const unsigned char *addr, u16 vid);
 634 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 635 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 636 void br_fdb_cleanup(struct work_struct *work);
 637 void br_fdb_delete_by_port(struct net_bridge *br,
 638                            const struct net_bridge_port *p, u16 vid, int do_all);
 639 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
 640                                              const unsigned char *addr,
 641                                              __u16 vid);
 642 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 643 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 644                    unsigned long off);
 645 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 646                   const unsigned char *addr, u16 vid);
 647 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 648                    const unsigned char *addr, u16 vid, unsigned long flags);
 649
 650 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 651                   struct net_device *dev, const unsigned char *addr, u16 vid);
 652 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 653                const unsigned char *addr, u16 vid, u16 nlh_flags,
 654                struct netlink_ext_ack *extack);
 655 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 656                 struct net_device *dev, struct net_device *fdev, int *idx);
 657 int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev,
 658                const unsigned char *addr, u16 vid, u32 portid, u32 seq,
 659                struct netlink_ext_ack *extack);
 660 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 661 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 662 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 663                               const unsigned char *addr, u16 vid,
 664                               bool swdev_notify);
 665 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 666                               const unsigned char *addr, u16 vid,
 667                               bool swdev_notify);
 668 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
 669                           const unsigned char *addr, u16 vid, bool offloaded);
 670
 671 /* br_forward.c */
 672 enum br_pkt_type {
 673         BR_PKT_UNICAST,
 674         BR_PKT_MULTICAST,
 675         BR_PKT_BROADCAST
 676 };
 677 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 678 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
 679                 bool local_rcv, bool local_orig);
 680 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 681 void br_flood(struct net_bridge *br, struct sk_buff *skb,
 682               enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
 683
 684 /* return true if both source port and dest port are isolated */
 685 static inline bool br_skb_isolated(const struct net_bridge_port *to,
 686                                    const struct sk_buff *skb)
 687 {
 688         return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
 689                (to->flags & BR_ISOLATED);
 690 }
 691
 692 /* br_if.c */
 693 void br_port_carrier_check(struct net_bridge_port *p, bool *notified);
 694 int br_add_bridge(struct net *net, const char *name);
 695 int br_del_bridge(struct net *net, const char *name);
 696 int br_add_if(struct net_bridge *br, struct net_device *dev,
 697               struct netlink_ext_ack *extack);
 698 int br_del_if(struct net_bridge *br, struct net_device *dev);
 699 void br_mtu_auto_adjust(struct net_bridge *br);
 700 netdev_features_t br_features_recompute(struct net_bridge *br,
 701                                         netdev_features_t features);
 702 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 703 void br_manage_promisc(struct net_bridge *br);
 704 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev);
 705
 706 /* br_input.c */
 707 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 708 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 709
 710 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 711 {
 712         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 713 }
 714
 715 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev)
 716 {
 717         return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame;
 718 }
 719
 720 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 721 {
 722         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 723 }
 724
 725 static inline struct net_bridge_port *
 726 br_port_get_check_rtnl(const struct net_device *dev)
 727 {
 728         return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL;
 729 }
 730
 731 /* br_ioctl.c */
 732 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 733 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 734                              void __user *arg);
 735
 736 /* br_multicast.c */
 737 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 738 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 739                      struct sk_buff *skb, u16 vid);
 740 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 741                                         struct sk_buff *skb, u16 vid);
 742 int br_multicast_add_port(struct net_bridge_port *port);
 743 void br_multicast_del_port(struct net_bridge_port *port);
 744 void br_multicast_enable_port(struct net_bridge_port *port);
 745 void br_multicast_disable_port(struct net_bridge_port *port);
 746 void br_multicast_init(struct net_bridge *br);
 747 void br_multicast_open(struct net_bridge *br);
 748 void br_multicast_stop(struct net_bridge *br);
 749 void br_multicast_dev_del(struct net_bridge *br);
 750 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 751                         struct sk_buff *skb, bool local_rcv, bool local_orig);
 752 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 753 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 754 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 755 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 756 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 757 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
 758 #if IS_ENABLED(CONFIG_IPV6)
 759 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
 760 #endif
 761 struct net_bridge_mdb_entry *
 762 br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst);
 763 struct net_bridge_mdb_entry *
 764 br_multicast_new_group(struct net_bridge *br, struct br_ip *group);
 765 struct net_bridge_port_group *
 766 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 767                             struct net_bridge_port_group __rcu *next,
 768                             unsigned char flags, const unsigned char *src);
 769 int br_mdb_hash_init(struct net_bridge *br);
 770 void br_mdb_hash_fini(struct net_bridge *br);
 771 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 772                    struct br_ip *group, int type, u8 flags);
 773 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 774                    int type);
 775 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
 776                         const struct sk_buff *skb, u8 type, u8 dir);
 777 int br_multicast_init_stats(struct net_bridge *br);
 778 void br_multicast_uninit_stats(struct net_bridge *br);
 779 void br_multicast_get_stats(const struct net_bridge *br,
 780                             const struct net_bridge_port *p,
 781                             struct br_mcast_stats *dest);
 782 void br_mdb_init(void);
 783 void br_mdb_uninit(void);
 784 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify);
 785 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify);
 786
 787 #define mlock_dereference(X, br) \
 788         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 789
 790 static inline bool br_multicast_is_router(struct net_bridge *br)
 791 {
 792         return br->multicast_router == 2 ||
 793                (br->multicast_router == 1 &&
 794                 timer_pending(&br->multicast_router_timer));
 795 }
 796
 797 static inline bool
 798 __br_multicast_querier_exists(struct net_bridge *br,
 799                                 struct bridge_mcast_other_query *querier,
 800                                 const bool is_ipv6)
 801 {
 802         bool own_querier_enabled;
 803
 804         if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
 805                 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR))
 806                         own_querier_enabled = false;
 807                 else
 808                         own_querier_enabled = true;
 809         } else {
 810                 own_querier_enabled = false;
 811         }
 812
 813         return time_is_before_jiffies(querier->delay_time) &&
 814                (own_querier_enabled || timer_pending(&querier->timer));
 815 }
 816
 817 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 818                                                struct ethhdr *eth)
 819 {
 820         switch (eth->h_proto) {
 821         case (htons(ETH_P_IP)):
 822                 return __br_multicast_querier_exists(br,
 823                         &br->ip4_other_query, false);
 824 #if IS_ENABLED(CONFIG_IPV6)
 825         case (htons(ETH_P_IPV6)):
 826                 return __br_multicast_querier_exists(br,
 827                         &br->ip6_other_query, true);
 828 #endif
 829         default:
 830                 return false;
 831         }
 832 }
 833
 834 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 835 {
 836         return BR_INPUT_SKB_CB(skb)->igmp;
 837 }
 838 #else
 839 static inline int br_multicast_rcv(struct net_bridge *br,
 840                                    struct net_bridge_port *port,
 841                                    struct sk_buff *skb,
 842                                    u16 vid)
 843 {
 844         return 0;
 845 }
 846
 847 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 848                                                       struct sk_buff *skb, u16 vid)
 849 {
 850         return NULL;
 851 }
 852
 853 static inline int br_multicast_add_port(struct net_bridge_port *port)
 854 {
 855         return 0;
 856 }
 857
 858 static inline void br_multicast_del_port(struct net_bridge_port *port)
 859 {
 860 }
 861
 862 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 863 {
 864 }
 865
 866 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 867 {
 868 }
 869
 870 static inline void br_multicast_init(struct net_bridge *br)
 871 {
 872 }
 873
 874 static inline void br_multicast_open(struct net_bridge *br)
 875 {
 876 }
 877
 878 static inline void br_multicast_stop(struct net_bridge *br)
 879 {
 880 }
 881
 882 static inline void br_multicast_dev_del(struct net_bridge *br)
 883 {
 884 }
 885
 886 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 887                                       struct sk_buff *skb,
 888                                       bool local_rcv, bool local_orig)
 889 {
 890 }
 891
 892 static inline bool br_multicast_is_router(struct net_bridge *br)
 893 {
 894         return false;
 895 }
 896
 897 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 898                                                struct ethhdr *eth)
 899 {
 900         return false;
 901 }
 902
 903 static inline void br_mdb_init(void)
 904 {
 905 }
 906
 907 static inline void br_mdb_uninit(void)
 908 {
 909 }
 910
 911 static inline int br_mdb_hash_init(struct net_bridge *br)
 912 {
 913         return 0;
 914 }
 915
 916 static inline void br_mdb_hash_fini(struct net_bridge *br)
 917 {
 918 }
 919
 920 static inline void br_multicast_count(struct net_bridge *br,
 921                                       const struct net_bridge_port *p,
 922                                       const struct sk_buff *skb,
 923                                       u8 type, u8 dir)
 924 {
 925 }
 926
 927 static inline int br_multicast_init_stats(struct net_bridge *br)
 928 {
 929         return 0;
 930 }
 931
 932 static inline void br_multicast_uninit_stats(struct net_bridge *br)
 933 {
 934 }
 935
 936 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 937 {
 938         return 0;
 939 }
 940 #endif
 941
 942 /* br_vlan.c */
 943 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 944 bool br_allowed_ingress(const struct net_bridge *br,
 945                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 946                         u16 *vid, u8 *state);
 947 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 948                        const struct sk_buff *skb);
 949 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 950 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 951                                const struct net_bridge_port *port,
 952                                struct net_bridge_vlan_group *vg,
 953                                struct sk_buff *skb);
 954 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
 955                 bool *changed, struct netlink_ext_ack *extack);
 956 int br_vlan_delete(struct net_bridge *br, u16 vid);
 957 void br_vlan_flush(struct net_bridge *br);
 958 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 959 void br_recalculate_fwd_mask(struct net_bridge *br);
 960 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 961 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 962 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 963 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 964 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
 965 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val);
 966 int br_vlan_init(struct net_bridge *br);
 967 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 968 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
 969                                struct netlink_ext_ack *extack);
 970 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
 971                  bool *changed, struct netlink_ext_ack *extack);
 972 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 973 void nbp_vlan_flush(struct net_bridge_port *port);
 974 int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack);
 975 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 976 void br_vlan_get_stats(const struct net_bridge_vlan *v,
 977                        struct br_vlan_stats *stats);
 978 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event);
 979 int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
 980                          void *ptr);
 981 void br_vlan_rtnl_init(void);
 982 void br_vlan_rtnl_uninit(void);
 983 void br_vlan_notify(const struct net_bridge *br,
 984                     const struct net_bridge_port *p,
 985                     u16 vid, u16 vid_range,
 986                     int cmd);
 987 bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
 988                              const struct net_bridge_vlan *range_end);
 989
 990 static inline struct net_bridge_vlan_group *br_vlan_group(
 991                                         const struct net_bridge *br)
 992 {
 993         return rtnl_dereference(br->vlgrp);
 994 }
 995
 996 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 997                                         const struct net_bridge_port *p)
 998 {
 999         return rtnl_dereference(p->vlgrp);
1000 }
1001
1002 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1003                                         const struct net_bridge *br)
1004 {
1005         return rcu_dereference(br->vlgrp);
1006 }
1007
1008 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1009                                         const struct net_bridge_port *p)
1010 {
1011         return rcu_dereference(p->vlgrp);
1012 }
1013
1014 /* Since bridge now depends on 8021Q module, but the time bridge sees the
1015  * skb, the vlan tag will always be present if the frame was tagged.
1016  */
1017 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
1018 {
1019         int err = 0;
1020
1021         if (skb_vlan_tag_present(skb)) {
1022                 *vid = skb_vlan_tag_get_id(skb);
1023         } else {
1024                 *vid = 0;
1025                 err = -EINVAL;
1026         }
1027
1028         return err;
1029 }
1030
1031 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1032 {
1033         if (!vg)
1034                 return 0;
1035
1036         smp_rmb();
1037         return vg->pvid;
1038 }
1039
1040 static inline u16 br_vlan_flags(const struct net_bridge_vlan *v, u16 pvid)
1041 {
1042         return v->vid == pvid ? v->flags | BRIDGE_VLAN_INFO_PVID : v->flags;
1043 }
1044 #else
1045 static inline bool br_allowed_ingress(const struct net_bridge *br,
1046                                       struct net_bridge_vlan_group *vg,
1047                                       struct sk_buff *skb,
1048                                       u16 *vid, u8 *state)
1049 {
1050         return true;
1051 }
1052
1053 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
1054                                      const struct sk_buff *skb)
1055 {
1056         return true;
1057 }
1058
1059 static inline bool br_should_learn(struct net_bridge_port *p,
1060                                    struct sk_buff *skb, u16 *vid)
1061 {
1062         return true;
1063 }
1064
1065 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
1066                                              const struct net_bridge_port *port,
1067                                              struct net_bridge_vlan_group *vg,
1068                                              struct sk_buff *skb)
1069 {
1070         return skb;
1071 }
1072
1073 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
1074                               bool *changed, struct netlink_ext_ack *extack)
1075 {
1076         *changed = false;
1077         return -EOPNOTSUPP;
1078 }
1079
1080 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
1081 {
1082         return -EOPNOTSUPP;
1083 }
1084
1085 static inline void br_vlan_flush(struct net_bridge *br)
1086 {
1087 }
1088
1089 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
1090 {
1091 }
1092
1093 static inline int br_vlan_init(struct net_bridge *br)
1094 {
1095         return 0;
1096 }
1097
1098 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1099                                bool *changed, struct netlink_ext_ack *extack)
1100 {
1101         *changed = false;
1102         return -EOPNOTSUPP;
1103 }
1104
1105 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1106 {
1107         return -EOPNOTSUPP;
1108 }
1109
1110 static inline void nbp_vlan_flush(struct net_bridge_port *port)
1111 {
1112 }
1113
1114 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
1115                                                    u16 vid)
1116 {
1117         return NULL;
1118 }
1119
1120 static inline int nbp_vlan_init(struct net_bridge_port *port,
1121                                 struct netlink_ext_ack *extack)
1122 {
1123         return 0;
1124 }
1125
1126 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
1127 {
1128         return 0;
1129 }
1130
1131 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1132 {
1133         return 0;
1134 }
1135
1136 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
1137                                           unsigned long val)
1138 {
1139         return -EOPNOTSUPP;
1140 }
1141
1142 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
1143                                          u32 filter_mask)
1144 {
1145         return 0;
1146 }
1147
1148 static inline struct net_bridge_vlan_group *br_vlan_group(
1149                                         const struct net_bridge *br)
1150 {
1151         return NULL;
1152 }
1153
1154 static inline struct net_bridge_vlan_group *nbp_vlan_group(
1155                                         const struct net_bridge_port *p)
1156 {
1157         return NULL;
1158 }
1159
1160 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1161                                         const struct net_bridge *br)
1162 {
1163         return NULL;
1164 }
1165
1166 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1167                                         const struct net_bridge_port *p)
1168 {
1169         return NULL;
1170 }
1171
1172 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
1173                                      struct br_vlan_stats *stats)
1174 {
1175 }
1176
1177 static inline void br_vlan_port_event(struct net_bridge_port *p,
1178                                       unsigned long event)
1179 {
1180 }
1181
1182 static inline int br_vlan_bridge_event(struct net_device *dev,
1183                                        unsigned long event, void *ptr)
1184 {
1185         return 0;
1186 }
1187
1188 static inline void br_vlan_rtnl_init(void)
1189 {
1190 }
1191
1192 static inline void br_vlan_rtnl_uninit(void)
1193 {
1194 }
1195
1196 static inline void br_vlan_notify(const struct net_bridge *br,
1197                                   const struct net_bridge_port *p,
1198                                   u16 vid, u16 vid_range,
1199                                   int cmd)
1200 {
1201 }
1202 #endif
1203
1204 /* br_vlan_options.c */
1205 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
1206 bool br_vlan_opts_eq_range(const struct net_bridge_vlan *v_curr,
1207                            const struct net_bridge_vlan *range_end);
1208 bool br_vlan_opts_fill(struct sk_buff *skb, const struct net_bridge_vlan *v);
1209 size_t br_vlan_opts_nl_size(void);
1210 int br_vlan_process_options(const struct net_bridge *br,
1211                             const struct net_bridge_port *p,
1212                             struct net_bridge_vlan *range_start,
1213                             struct net_bridge_vlan *range_end,
1214                             struct nlattr **tb,
1215                             struct netlink_ext_ack *extack);
1216
1217 /* vlan state manipulation helpers using *_ONCE to annotate lock-free access */
1218 static inline u8 br_vlan_get_state(const struct net_bridge_vlan *v)
1219 {
1220         return READ_ONCE(v->state);
1221 }
1222
1223 static inline void br_vlan_set_state(struct net_bridge_vlan *v, u8 state)
1224 {
1225         WRITE_ONCE(v->state, state);
1226 }
1227
1228 static inline u8 br_vlan_get_pvid_state(const struct net_bridge_vlan_group *vg)
1229 {
1230         return READ_ONCE(vg->pvid_state);
1231 }
1232
1233 static inline void br_vlan_set_pvid_state(struct net_bridge_vlan_group *vg,
1234                                           u8 state)
1235 {
1236         WRITE_ONCE(vg->pvid_state, state);
1237 }
1238
1239 /* learn_allow is true at ingress and false at egress */
1240 static inline bool br_vlan_state_allowed(u8 state, bool learn_allow)
1241 {
1242         switch (state) {
1243         case BR_STATE_LEARNING:
1244                 return learn_allow;
1245         case BR_STATE_FORWARDING:
1246                 return true;
1247         default:
1248                 return false;
1249         }
1250 }
1251 #endif
1252
1253 struct nf_br_ops {
1254         int (*br_dev_xmit_hook)(struct sk_buff *skb);
1255 };
1256 extern const struct nf_br_ops __rcu *nf_br_ops;
1257
1258 /* br_netfilter.c */
1259 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1260 int br_nf_core_init(void);
1261 void br_nf_core_fini(void);
1262 void br_netfilter_rtable_init(struct net_bridge *);
1263 #else
1264 static inline int br_nf_core_init(void) { return 0; }
1265 static inline void br_nf_core_fini(void) {}
1266 #define br_netfilter_rtable_init(x)
1267 #endif
1268
1269 /* br_stp.c */
1270 void br_set_state(struct net_bridge_port *p, unsigned int state);
1271 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1272 void br_init_port(struct net_bridge_port *p);
1273 void br_become_designated_port(struct net_bridge_port *p);
1274
1275 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1276 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1277 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1278 int br_set_max_age(struct net_bridge *br, unsigned long x);
1279 int __set_ageing_time(struct net_device *dev, unsigned long t);
1280 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1281
1282
1283 /* br_stp_if.c */
1284 void br_stp_enable_bridge(struct net_bridge *br);
1285 void br_stp_disable_bridge(struct net_bridge *br);
1286 int br_stp_set_enabled(struct net_bridge *br, unsigned long val,
1287                        struct netlink_ext_ack *extack);
1288 void br_stp_enable_port(struct net_bridge_port *p);
1289 void br_stp_disable_port(struct net_bridge_port *p);
1290 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1291 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1292 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1293 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1294 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1295 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1296
1297 /* br_stp_bpdu.c */
1298 struct stp_proto;
1299 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1300                 struct net_device *dev);
1301
1302 /* br_stp_timer.c */
1303 void br_stp_timer_init(struct net_bridge *br);
1304 void br_stp_port_timer_init(struct net_bridge_port *p);
1305 unsigned long br_timer_value(const struct timer_list *timer);
1306
1307 /* br.c */
1308 #if IS_ENABLED(CONFIG_ATM_LANE)
1309 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1310 #endif
1311
1312 /* br_mrp.c */
1313 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
1314 int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
1315                  struct nlattr *attr, int cmd, struct netlink_ext_ack *extack);
1316 int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb);
1317 bool br_mrp_enabled(struct net_bridge *br);
1318 void br_mrp_port_del(struct net_bridge *br, struct net_bridge_port *p);
1319 #else
1320 static inline int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
1321                                struct nlattr *attr, int cmd,
1322                                struct netlink_ext_ack *extack)
1323 {
1324         return -EOPNOTSUPP;
1325 }
1326
1327 static inline int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb)
1328 {
1329         return 0;
1330 }
1331
1332 static inline bool br_mrp_enabled(struct net_bridge *br)
1333 {
1334         return 0;
1335 }
1336
1337 static inline void br_mrp_port_del(struct net_bridge *br,
1338                                    struct net_bridge_port *p)
1339 {
1340 }
1341 #endif
1342
1343 /* br_netlink.c */
1344 extern struct rtnl_link_ops br_link_ops;
1345 int br_netlink_init(void);
1346 void br_netlink_fini(void);
1347 void br_ifinfo_notify(int event, const struct net_bridge *br,
1348                       const struct net_bridge_port *port);
1349 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags,
1350                struct netlink_ext_ack *extack);
1351 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1352 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1353                u32 filter_mask, int nlflags);
1354 int br_process_vlan_info(struct net_bridge *br,
1355                          struct net_bridge_port *p, int cmd,
1356                          struct bridge_vlan_info *vinfo_curr,
1357                          struct bridge_vlan_info **vinfo_last,
1358                          bool *changed,
1359                          struct netlink_ext_ack *extack);
1360
1361 #ifdef CONFIG_SYSFS
1362 /* br_sysfs_if.c */
1363 extern const struct sysfs_ops brport_sysfs_ops;
1364 int br_sysfs_addif(struct net_bridge_port *p);
1365 int br_sysfs_renameif(struct net_bridge_port *p);
1366
1367 /* br_sysfs_br.c */
1368 int br_sysfs_addbr(struct net_device *dev);
1369 void br_sysfs_delbr(struct net_device *dev);
1370
1371 #else
1372
1373 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1374 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1375 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1376 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1377 #endif /* CONFIG_SYSFS */
1378
1379 /* br_switchdev.c */
1380 #ifdef CONFIG_NET_SWITCHDEV
1381 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1382 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1383                               struct sk_buff *skb);
1384 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1385                                   const struct sk_buff *skb);
1386 int br_switchdev_set_port_flag(struct net_bridge_port *p,
1387                                unsigned long flags,
1388                                unsigned long mask);
1389 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
1390                              int type);
1391 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
1392                                struct netlink_ext_ack *extack);
1393 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
1394
1395 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1396 {
1397         skb->offload_fwd_mark = 0;
1398 }
1399 #else
1400 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1401 {
1402         return 0;
1403 }
1404
1405 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1406                                             struct sk_buff *skb)
1407 {
1408 }
1409
1410 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1411                                                 const struct sk_buff *skb)
1412 {
1413         return true;
1414 }
1415
1416 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1417                                              unsigned long flags,
1418                                              unsigned long mask)
1419 {
1420         return 0;
1421 }
1422
1423 static inline int br_switchdev_port_vlan_add(struct net_device *dev,
1424                                              u16 vid, u16 flags,
1425                                              struct netlink_ext_ack *extack)
1426 {
1427         return -EOPNOTSUPP;
1428 }
1429
1430 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
1431 {
1432         return -EOPNOTSUPP;
1433 }
1434
1435 static inline void
1436 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
1437 {
1438 }
1439
1440 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1441 {
1442 }
1443 #endif /* CONFIG_NET_SWITCHDEV */
1444
1445 /* br_arp_nd_proxy.c */
1446 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br);
1447 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
1448                               u16 vid, struct net_bridge_port *p);
1449 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
1450                        u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
1451 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);
1452 #endif